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authorChristian Grothoff <christian@grothoff.org>2017-03-11 12:53:18 +0100
committerChristian Grothoff <christian@grothoff.org>2017-03-11 12:53:18 +0100
commitbcf3298c5eb79dd98bfc8ccf58793703aac70f49 (patch)
tree2bc59b82d74596c65b3caab68f6102da516dfc46 /src/cadet
parentcd3d159df3150d46a6de7d39bcefb16f03ed5d3b (diff)
downloadgnunet-bcf3298c5eb79dd98bfc8ccf58793703aac70f49.tar.gz
gnunet-bcf3298c5eb79dd98bfc8ccf58793703aac70f49.zip
remove old CADET service code
Diffstat (limited to 'src/cadet')
-rw-r--r--src/cadet/Makefile.am26
-rw-r--r--src/cadet/gnunet-service-cadet.c184
-rw-r--r--src/cadet/gnunet-service-cadet_channel.c2562
-rw-r--r--src/cadet/gnunet-service-cadet_channel.h363
-rw-r--r--src/cadet/gnunet-service-cadet_connection.c3713
-rw-r--r--src/cadet/gnunet-service-cadet_connection.h576
-rw-r--r--src/cadet/gnunet-service-cadet_dht.c424
-rw-r--r--src/cadet/gnunet-service-cadet_dht.h93
-rw-r--r--src/cadet/gnunet-service-cadet_hello.c200
-rw-r--r--src/cadet/gnunet-service-cadet_hello.h79
-rw-r--r--src/cadet/gnunet-service-cadet_local.c1553
-rw-r--r--src/cadet/gnunet-service-cadet_local.h234
-rw-r--r--src/cadet/gnunet-service-cadet_peer.c2209
-rw-r--r--src/cadet/gnunet-service-cadet_peer.h483
-rw-r--r--src/cadet/gnunet-service-cadet_tunnel.c3501
-rw-r--r--src/cadet/gnunet-service-cadet_tunnel.h616
16 files changed, 1 insertions, 16815 deletions
diff --git a/src/cadet/Makefile.am b/src/cadet/Makefile.am
index b52079b2e..518646664 100644
--- a/src/cadet/Makefile.am
+++ b/src/cadet/Makefile.am
@@ -22,7 +22,6 @@ plugindir = $(libdir)/gnunet
22AM_CLFAGS = -g 22AM_CLFAGS = -g
23 23
24libexec_PROGRAMS = \ 24libexec_PROGRAMS = \
25 gnunet-service-cadet \
26 gnunet-service-cadet-new \ 25 gnunet-service-cadet-new \
27 $(EXP_LIBEXEC) 26 $(EXP_LIBEXEC)
28 27
@@ -81,31 +80,8 @@ gnunet_service_cadet_new_LDADD = \
81 $(top_builddir)/src/peerinfo/libgnunetpeerinfo.la \ 80 $(top_builddir)/src/peerinfo/libgnunetpeerinfo.la \
82 $(top_builddir)/src/hello/libgnunethello.la \ 81 $(top_builddir)/src/hello/libgnunethello.la \
83 $(top_builddir)/src/block/libgnunetblock.la 82 $(top_builddir)/src/block/libgnunetblock.la
84
85gnunet_service_cadet_SOURCES = \
86 gnunet-service-cadet_tunnel.c gnunet-service-cadet_tunnel.h \
87 gnunet-service-cadet_connection.c gnunet-service-cadet_connection.h \
88 gnunet-service-cadet_channel.c gnunet-service-cadet_channel.h \
89 gnunet-service-cadet_local.c gnunet-service-cadet_local.h \
90 gnunet-service-cadet_peer.c gnunet-service-cadet_peer.h \
91 gnunet-service-cadet_dht.c gnunet-service-cadet_dht.h \
92 gnunet-service-cadet_hello.c gnunet-service-cadet_hello.h \
93 cadet_path.c cadet_path.h \
94 cadet_common.c \
95 gnunet-service-cadet.c
96gnunet_service_cadet_CFLAGS = $(AM_CFLAGS)
97gnunet_service_cadet_LDADD = \
98 $(top_builddir)/src/util/libgnunetutil.la \
99 $(top_builddir)/src/transport/libgnunettransport.la \
100 $(top_builddir)/src/core/libgnunetcore.la \
101 $(top_builddir)/src/ats/libgnunetats.la \
102 $(top_builddir)/src/dht/libgnunetdht.la \
103 $(top_builddir)/src/statistics/libgnunetstatistics.la \
104 $(top_builddir)/src/peerinfo/libgnunetpeerinfo.la \
105 $(top_builddir)/src/hello/libgnunethello.la \
106 $(top_builddir)/src/block/libgnunetblock.la
107if LINUX 83if LINUX
108 gnunet_service_cadet_LDFLAGS = -lrt 84 gnunet_service_cadet_new_LDFLAGS = -lrt
109endif 85endif
110 86
111 87
diff --git a/src/cadet/gnunet-service-cadet.c b/src/cadet/gnunet-service-cadet.c
deleted file mode 100644
index 3a07f0ee5..000000000
--- a/src/cadet/gnunet-service-cadet.c
+++ /dev/null
@@ -1,184 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2001-2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet.c
23 * @brief GNUnet CADET service with encryption
24 * @author Bartlomiej Polot
25 *
26 * FIXME in progress:
27 * - rekey - reliability interaction
28 * - channel retransmit timing
29 *
30 * TODO:
31 * - relay corking down to core
32 * - set ttl relative to path length
33 * TODO END
34 *
35 * Dictionary:
36 * - peer: other cadet instance. If there is direct connection it's a neighbor.
37 * - tunnel: encrypted connection to a peer, neighbor or not.
38 * - channel: connection between two clients, on the same or different peers.
39 * have properties like reliability.
40 * - path: series of directly connected peer from one peer to another.
41 * - connection: path which is being used in a tunnel.
42 */
43
44#include "platform.h"
45#include "gnunet_util_lib.h"
46#include "cadet.h"
47#include "gnunet_statistics_service.h"
48
49#include "gnunet-service-cadet_local.h"
50#include "gnunet-service-cadet_channel.h"
51#include "gnunet-service-cadet_connection.h"
52#include "gnunet-service-cadet_tunnel.h"
53#include "gnunet-service-cadet_dht.h"
54#include "gnunet-service-cadet_peer.h"
55#include "gnunet-service-cadet_hello.h"
56
57
58/******************************************************************************/
59/*********************** GLOBAL VARIABLES ****************************/
60/******************************************************************************/
61
62/****************************** Global variables ******************************/
63
64/**
65 * Handle to the statistics service.
66 */
67struct GNUNET_STATISTICS_Handle *stats;
68
69/**
70 * Local peer own ID (memory efficient handle).
71 */
72GNUNET_PEER_Id myid;
73
74/**
75 * Local peer own ID (full value).
76 */
77struct GNUNET_PeerIdentity my_full_id;
78
79
80/**
81 * Signal that shutdown is happening: prevent recover measures.
82 */
83int shutting_down;
84
85/*************************** Static global variables **************************/
86
87/**
88 * Own private key.
89 */
90static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
91
92
93/******************************************************************************/
94/************************ MAIN FUNCTIONS ****************************/
95/******************************************************************************/
96
97/**
98 * Task run during shutdown.
99 *
100 * @param cls unused
101 */
102static void
103shutdown_task (void *cls)
104{
105 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
106
107 shutting_down = GNUNET_YES;
108
109 GML_shutdown ();
110 GCH_shutdown ();
111 GCC_shutdown ();
112 GCT_shutdown ();
113 GCD_shutdown ();
114 GCP_shutdown ();
115
116 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
117 stats = NULL;
118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
119}
120
121
122/**
123 * Process cadet requests.
124 *
125 * @param cls closure
126 * @param server the initialized server
127 * @param c configuration to use
128 */
129static void
130run (void *cls, struct GNUNET_SERVER_Handle *server,
131 const struct GNUNET_CONFIGURATION_Handle *c)
132{
133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
134
135 stats = GNUNET_STATISTICS_create ("cadet", c);
136
137 /* Scheduled the task to clean up when shutdown is called */
138 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
139 NULL);
140 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "reading key\n");
141 my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (c);
142 GNUNET_assert (NULL != my_private_key);
143 GNUNET_CRYPTO_eddsa_key_get_public (my_private_key, &my_full_id.public_key);
144 myid = GNUNET_PEER_intern (&my_full_id);
145 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
146 "STARTING SERVICE (cadet) for peer [%s]\n",
147 GNUNET_i2s (&my_full_id));
148
149 GML_init (server); /* Local clients */
150 GCH_init (c); /* Hellos */
151 GCC_init (c); /* Connections */
152 GCP_init (c); /* Peers */
153 GCD_init (c); /* DHT */
154 GCT_init (c, my_private_key); /* Tunnels */
155
156 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Cadet service running\n");
157}
158
159
160/**
161 * The main function for the cadet service.
162 *
163 * @param argc number of arguments from the command line
164 * @param argv command line arguments
165 * @return 0 ok, 1 on error
166 */
167int
168main (int argc, char *const *argv)
169{
170 int r;
171
172 shutting_down = GNUNET_NO;
173 r = GNUNET_SERVICE_run (argc, argv, "cadet", GNUNET_SERVICE_OPTION_NONE, &run,
174 NULL);
175 GNUNET_free (my_private_key);
176
177 if (GNUNET_OK != r)
178 {
179 FPRINTF (stderr, "GNUNET_SERVICE_run for CADET has failed!\n");
180 return 1;
181 }
182
183 return 0;
184}
diff --git a/src/cadet/gnunet-service-cadet_channel.c b/src/cadet/gnunet-service-cadet_channel.c
deleted file mode 100644
index 7b7c6e57c..000000000
--- a/src/cadet/gnunet-service-cadet_channel.c
+++ /dev/null
@@ -1,2562 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21
22#include "platform.h"
23#include "gnunet_util_lib.h"
24
25#include "gnunet_statistics_service.h"
26
27#include "cadet.h"
28#include "cadet_protocol.h"
29
30#include "gnunet-service-cadet_channel.h"
31#include "gnunet-service-cadet_local.h"
32#include "gnunet-service-cadet_tunnel.h"
33#include "gnunet-service-cadet_peer.h"
34
35#define LOG(level, ...) GNUNET_log_from(level,"cadet-chn",__VA_ARGS__)
36#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-chn",__VA_ARGS__)
37
38#define CADET_RETRANSMIT_TIME GNUNET_TIME_relative_multiply(\
39 GNUNET_TIME_UNIT_MILLISECONDS, 250)
40#define CADET_RETRANSMIT_MARGIN 4
41
42
43/**
44 * All the states a connection can be in.
45 */
46enum CadetChannelState
47{
48 /**
49 * Uninitialized status, should never appear in operation.
50 */
51 CADET_CHANNEL_NEW,
52
53 /**
54 * Connection create message sent, waiting for ACK.
55 */
56 CADET_CHANNEL_SENT,
57
58 /**
59 * Connection confirmed, ready to carry traffic.
60 */
61 CADET_CHANNEL_READY
62};
63
64
65/**
66 * Info holder for channel messages in queues.
67 */
68struct CadetChannelQueue
69{
70 /**
71 * Tunnel Queue.
72 */
73 struct CadetTunnelQueue *tq;
74
75 /**
76 * Message type (DATA/DATA_ACK)
77 */
78 uint16_t type;
79
80 /**
81 * Message copy (for DATAs, to start retransmission timer)
82 */
83 struct CadetReliableMessage *copy;
84
85 /**
86 * Reliability (for DATA_ACKs, to access rel->ack_q)
87 */
88 struct CadetChannelReliability *rel;
89};
90
91
92/**
93 * Info needed to retry a message in case it gets lost.
94 */
95struct CadetReliableMessage
96{
97 /**
98 * Double linked list, FIFO style
99 */
100 struct CadetReliableMessage *next;
101 struct CadetReliableMessage *prev;
102
103 /**
104 * Type of message (payload, channel management).
105 */
106 int16_t type;
107
108 /**
109 * Tunnel Reliability queue this message is in.
110 */
111 struct CadetChannelReliability *rel;
112
113 /**
114 * ID of the message (ACK needed to free)
115 */
116 uint32_t mid;
117
118 /**
119 * Tunnel Queue.
120 */
121 struct CadetChannelQueue *chq;
122
123 /**
124 * When was this message issued (to calculate ACK delay)
125 */
126 struct GNUNET_TIME_Absolute timestamp;
127
128 /* struct GNUNET_CADET_ChannelAppDataMessage with payload */
129};
130
131
132/**
133 * Info about the traffic state for a client in a channel.
134 */
135struct CadetChannelReliability
136{
137 /**
138 * Channel this is about.
139 */
140 struct CadetChannel *ch;
141
142 /**
143 * DLL of messages sent and not yet ACK'd.
144 */
145 struct CadetReliableMessage *head_sent;
146 struct CadetReliableMessage *tail_sent;
147
148 /**
149 * DLL of messages received out of order.
150 */
151 struct CadetReliableMessage *head_recv;
152 struct CadetReliableMessage *tail_recv;
153
154 /**
155 * Messages received.
156 */
157 unsigned int n_recv;
158
159 /**
160 * Next MID to use for outgoing traffic.
161 */
162 uint32_t mid_send;
163
164 /**
165 * Next MID expected for incoming traffic.
166 */
167 uint32_t mid_recv;
168
169 /**
170 * Handle for queued unique data CREATE, DATA_ACK.
171 */
172 struct CadetChannelQueue *uniq;
173
174 /**
175 * Can we send data to the client?
176 */
177 int client_ready;
178
179 /**
180 * Can the client send data to us?
181 */
182 int client_allowed;
183
184 /**
185 * Task to resend/poll in case no ACK is received.
186 */
187 struct GNUNET_SCHEDULER_Task * retry_task;
188
189 /**
190 * Counter for exponential backoff.
191 */
192 struct GNUNET_TIME_Relative retry_timer;
193
194 /**
195 * How long does it usually take to get an ACK.
196 */
197 struct GNUNET_TIME_Relative expected_delay;
198};
199
200
201/**
202 * Struct containing all information regarding a channel to a remote client.
203 */
204struct CadetChannel
205{
206 /**
207 * Tunnel this channel is in.
208 */
209 struct CadetTunnel *t;
210
211 /**
212 * Destination port of the channel.
213 */
214 struct GNUNET_HashCode port;
215
216 /**
217 * Global channel number ( < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
218 */
219 struct GNUNET_CADET_ChannelTunnelNumber gid;
220
221 /**
222 * Local tunnel number for root (owner) client.
223 * ( >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI or 0 )
224 */
225 struct GNUNET_CADET_ClientChannelNumber lid_root;
226
227 /**
228 * Local tunnel number for local destination clients (incoming number)
229 * ( >= GNUNET_CADET_LOCAL_CHANNEL_ID_SERV or 0).
230 */
231 struct GNUNET_CADET_ClientChannelNumber lid_dest;
232
233 /**
234 * Channel state.
235 */
236 enum CadetChannelState state;
237
238 /**
239 * Is the tunnel bufferless (minimum latency)?
240 */
241 int nobuffer;
242
243 /**
244 * Is the tunnel reliable?
245 */
246 int reliable;
247
248 /**
249 * Last time the channel was used
250 */
251 struct GNUNET_TIME_Absolute timestamp;
252
253 /**
254 * Client owner of the tunnel, if any
255 */
256 struct CadetClient *root;
257
258 /**
259 * Client destination of the tunnel, if any.
260 */
261 struct CadetClient *dest;
262
263 /**
264 * Flag to signal the destruction of the channel.
265 * If this is set to #GNUNET_YES the channel will be destroyed
266 * when the queue is empty.
267 */
268 int destroy;
269
270 /**
271 * Total (reliable) messages pending ACK for this channel.
272 */
273 unsigned int pending_messages;
274
275 /**
276 * Reliability data.
277 * Only present (non-NULL) at the owner of a tunnel.
278 */
279 struct CadetChannelReliability *root_rel;
280
281 /**
282 * Reliability data.
283 * Only present (non-NULL) at the destination of a tunnel.
284 */
285 struct CadetChannelReliability *dest_rel;
286
287};
288
289
290/******************************************************************************/
291/******************************* GLOBALS ***********************************/
292/******************************************************************************/
293
294/**
295 * Global handle to the statistics service.
296 */
297extern struct GNUNET_STATISTICS_Handle *stats;
298
299/**
300 * Local peer own ID (memory efficient handle).
301 */
302extern GNUNET_PEER_Id myid;
303
304
305/******************************************************************************/
306/******************************** STATIC ***********************************/
307/******************************************************************************/
308
309
310/**
311 * Destroy a reliable message after it has been acknowledged, either by
312 * direct mid ACK or bitfield. Updates the appropriate data structures and
313 * timers and frees all memory.
314 *
315 * @param copy Message that is no longer needed: remote peer got it.
316 * @param update_time Is the timing information relevant?
317 * If this message is ACK in a batch the timing information
318 * is skewed by the retransmission, count only for the
319 * retransmitted message.
320 *
321 * @return #GNUNET_YES if channel was destroyed as a result of the call,
322 * #GNUNET_NO otherwise.
323 */
324static int
325rel_message_free (struct CadetReliableMessage *copy, int update_time);
326
327/**
328 * send a channel create message.
329 *
330 * @param ch Channel for which to send.
331 */
332static void
333send_create (struct CadetChannel *ch);
334
335/**
336 * Confirm we got a channel create, FWD ack.
337 *
338 * @param ch The channel to confirm.
339 * @param fwd Should we send a FWD ACK? (going dest->root)
340 */
341static void
342send_ack (struct CadetChannel *ch, int fwd);
343
344
345
346/**
347 * Test if the channel is loopback: both root and dest are on the local peer.
348 *
349 * @param ch Channel to test.
350 *
351 * @return #GNUNET_YES if channel is loopback, #GNUNET_NO otherwise.
352 */
353static int
354is_loopback (const struct CadetChannel *ch)
355{
356 if (NULL != ch->t)
357 return GCT_is_loopback (ch->t);
358
359 return (NULL != ch->root && NULL != ch->dest);
360}
361
362
363/**
364 * Save a copy of the data message for later retransmission.
365 *
366 * @param msg Message to copy.
367 * @param mid Message ID.
368 * @param rel Reliability data for retransmission.
369 */
370static struct CadetReliableMessage *
371copy_message (const struct GNUNET_CADET_ChannelAppDataMessage *msg, uint32_t mid,
372 struct CadetChannelReliability *rel)
373{
374 struct CadetReliableMessage *copy;
375 uint16_t size;
376
377 size = ntohs (msg->header.size);
378 copy = GNUNET_malloc (sizeof (*copy) + size);
379 copy->mid = mid;
380 copy->rel = rel;
381 copy->type = GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA;
382 GNUNET_memcpy (&copy[1], msg, size);
383
384 return copy;
385}
386
387/**
388 * We have received a message out of order, or the client is not ready.
389 * Buffer it until we receive an ACK from the client or the missing
390 * message from the channel.
391 *
392 * @param msg Message to buffer (MUST be of type CADET_DATA).
393 * @param rel Reliability data to the corresponding direction.
394 */
395static void
396add_buffered_data (const struct GNUNET_CADET_ChannelAppDataMessage *msg,
397 struct CadetChannelReliability *rel)
398{
399 struct CadetReliableMessage *copy;
400 struct CadetReliableMessage *prev;
401 uint32_t mid;
402
403 mid = ntohl (msg->mid);
404
405 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data MID %u (%u)\n",
406 mid, rel->n_recv);
407
408 rel->n_recv++;
409
410 // FIXME do something better than O(n), although n < 64...
411 // FIXME start from the end (most messages are the latest ones)
412 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
413 {
414 LOG (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
415 if (prev->mid == mid)
416 {
417 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there!\n");
418 rel->n_recv--;
419 return;
420 }
421 else if (GC_is_pid_bigger (prev->mid, mid))
422 {
423 LOG (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
424 copy = copy_message (msg, mid, rel);
425 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
426 prev, copy);
427 return;
428 }
429 }
430 copy = copy_message (msg, mid, rel);
431 LOG (GNUNET_ERROR_TYPE_DEBUG, " insert at tail! (now: %u)\n", rel->n_recv);
432 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
433 LOG (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
434}
435
436
437/**
438 * Add a destination client to a channel, initializing all data structures
439 * in the channel and the client.
440 *
441 * @param ch Channel to which add the destination.
442 * @param c Client which to add to the channel.
443 */
444static void
445add_destination (struct CadetChannel *ch, struct CadetClient *c)
446{
447 if (NULL != ch->dest)
448 {
449 GNUNET_break (0);
450 return;
451 }
452
453 /* Assign local id as destination */
454 ch->lid_dest = GML_get_next_ccn (c);
455
456 /* Store in client's hashmap */
457 GML_channel_add (c, ch->lid_dest, ch);
458
459 GNUNET_break (NULL == ch->dest_rel);
460 ch->dest_rel = GNUNET_new (struct CadetChannelReliability);
461 ch->dest_rel->ch = ch;
462 ch->dest_rel->expected_delay.rel_value_us = 0;
463 ch->dest_rel->retry_timer = CADET_RETRANSMIT_TIME;
464
465 ch->dest = c;
466}
467
468
469/**
470 * Set options in a channel, extracted from a bit flag field.
471 *
472 * @param ch Channel to set options to.
473 * @param options Bit array in host byte order.
474 */
475static void
476channel_set_options (struct CadetChannel *ch, uint32_t options)
477{
478 ch->nobuffer = (options & GNUNET_CADET_OPTION_NOBUFFER) != 0 ?
479 GNUNET_YES : GNUNET_NO;
480 ch->reliable = (options & GNUNET_CADET_OPTION_RELIABLE) != 0 ?
481 GNUNET_YES : GNUNET_NO;
482}
483
484
485/**
486 * Get a bit flag field with the options of a channel.
487 *
488 * @param ch Channel to get options from.
489 *
490 * @return Bit array in host byte order.
491 */
492static uint32_t
493channel_get_options (struct CadetChannel *ch)
494{
495 uint32_t options;
496
497 options = 0;
498 if (ch->nobuffer)
499 options |= GNUNET_CADET_OPTION_NOBUFFER;
500 if (ch->reliable)
501 options |= GNUNET_CADET_OPTION_RELIABLE;
502
503 return options;
504}
505
506
507/**
508 * Notify a client that the channel is no longer valid.
509 *
510 * @param ch Channel that is destroyed.
511 * @param local_only Should we avoid sending it to other peers?
512 */
513static void
514send_destroy (struct CadetChannel *ch, int local_only)
515{
516 struct GNUNET_CADET_ChannelManageMessage msg;
517
518 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
519 msg.header.size = htons (sizeof (msg));
520 msg.ctn = ch->gid;
521
522 /* If root is not NULL, notify.
523 * If it's NULL, check lid_root. When a local destroy comes in, root
524 * is set to NULL but lid_root is left untouched. In this case, do nothing,
525 * the client is the one who requested the channel to be destroyed.
526 */
527 if (NULL != ch->root)
528 GML_send_channel_destroy (ch->root, ch->lid_root);
529 else if (0 == ch->lid_root.channel_of_client && GNUNET_NO == local_only)
530 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
531
532 if (NULL != ch->dest)
533 GML_send_channel_destroy (ch->dest, ch->lid_dest);
534 else if (0 == ch->lid_dest.channel_of_client && GNUNET_NO == local_only)
535 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_YES, NULL);
536}
537
538
539/**
540 * Notify the destination client that a new incoming channel was created.
541 *
542 * @param ch Channel that was created.
543 */
544static void
545send_client_create (struct CadetChannel *ch)
546{
547 uint32_t opt;
548
549 if (NULL == ch->dest)
550 return;
551
552 opt = 0;
553 opt |= GNUNET_YES == ch->reliable ? GNUNET_CADET_OPTION_RELIABLE : 0;
554 opt |= GNUNET_YES == ch->nobuffer ? GNUNET_CADET_OPTION_NOBUFFER : 0;
555 GML_send_channel_create (ch->dest,
556 ch->lid_dest,
557 &ch->port,
558 opt,
559 GCT_get_destination (ch->t));
560
561}
562
563
564/**
565 * Send data to a client.
566 *
567 * If the client is ready, send directly, otherwise buffer while listening
568 * for a local ACK.
569 *
570 * @param ch Channel
571 * @param msg Message.
572 * @param fwd Is this a fwd (root->dest) message?
573 */
574static void
575send_client_data (struct CadetChannel *ch,
576 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
577 int fwd)
578{
579 if (fwd)
580 {
581 if (ch->dest_rel->client_ready)
582 {
583 GML_send_data (ch->dest, msg, ch->lid_dest);
584 ch->dest_rel->client_ready = GNUNET_NO;
585 ch->dest_rel->mid_recv++;
586 }
587 else
588 add_buffered_data (msg, ch->dest_rel);
589 }
590 else
591 {
592 if (ch->root_rel->client_ready)
593 {
594 GML_send_data (ch->root, msg, ch->lid_root);
595 ch->root_rel->client_ready = GNUNET_NO;
596 ch->root_rel->mid_recv++;
597 }
598 else
599 add_buffered_data (msg, ch->root_rel);
600 }
601}
602
603
604/**
605 * Send a buffered message to the client, for in order delivery or
606 * as result of client ACK.
607 *
608 * @param ch Channel on which to empty the message buffer.
609 * @param c Client to send to.
610 * @param fwd Is this to send FWD data?.
611 */
612static void
613send_client_buffered_data (struct CadetChannel *ch,
614 struct CadetClient *c,
615 int fwd)
616{
617 struct CadetReliableMessage *copy;
618 struct CadetChannelReliability *rel;
619
620 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
621 rel = fwd ? ch->dest_rel : ch->root_rel;
622 if (GNUNET_NO == rel->client_ready)
623 {
624 LOG (GNUNET_ERROR_TYPE_DEBUG, "client not ready\n");
625 return;
626 }
627
628 copy = rel->head_recv;
629 /* We never buffer channel management messages */
630 if (NULL != copy)
631 {
632 if (copy->mid == rel->mid_recv || GNUNET_NO == ch->reliable)
633 {
634 struct GNUNET_CADET_ChannelAppDataMessage *msg = (struct GNUNET_CADET_ChannelAppDataMessage *) &copy[1];
635
636 LOG (GNUNET_ERROR_TYPE_DEBUG, " have %u! now expecting %u\n",
637 copy->mid, rel->mid_recv + 1);
638 send_client_data (ch, msg, fwd);
639 rel->n_recv--;
640 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
641 LOG (GNUNET_ERROR_TYPE_DEBUG, " free copy recv MID %u (%p), %u left\n",
642 copy->mid, copy, rel->n_recv);
643 GNUNET_free (copy);
644 GCCH_send_data_ack (ch, fwd);
645 }
646 else
647 {
648 LOG (GNUNET_ERROR_TYPE_DEBUG, " reliable && don't have %u, next is %u\n",
649 rel->mid_recv, copy->mid);
650 if (GNUNET_YES == ch->destroy)
651 {
652 /* We don't have the next data piece and the remote peer has closed the
653 * channel. We won't receive it anymore, so just destroy the channel.
654 * FIXME: wait some time to allow other connections to
655 * deliver missing messages
656 */
657 send_destroy (ch, GNUNET_YES);
658 GCCH_destroy (ch);
659 }
660 }
661 }
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
663}
664
665
666/**
667 * Allow a client to send more data.
668 *
669 * In case the client was already allowed to send data, do nothing.
670 *
671 * @param ch Channel.
672 * @param fwd Is this a FWD ACK? (FWD ACKs are sent to root)
673 */
674static void
675send_client_ack (struct CadetChannel *ch, int fwd)
676{
677 struct CadetChannelReliability *rel = fwd ? ch->root_rel : ch->dest_rel;
678 struct CadetClient *c = fwd ? ch->root : ch->dest;
679
680 if (NULL == c)
681 {
682 GNUNET_break (GNUNET_NO != ch->destroy);
683 return;
684 }
685 LOG (GNUNET_ERROR_TYPE_DEBUG,
686 " sending %s ack to client on channel %s\n",
687 GC_f2s (fwd), GCCH_2s (ch));
688
689 if (NULL == rel)
690 {
691 GNUNET_break (0);
692 return;
693 }
694
695 if (GNUNET_YES == rel->client_allowed)
696 {
697 LOG (GNUNET_ERROR_TYPE_DEBUG, " already allowed\n");
698 return;
699 }
700 rel->client_allowed = GNUNET_YES;
701
702 GML_send_ack (c, fwd ? ch->lid_root : ch->lid_dest);
703}
704
705
706/**
707 * Notify the root that the destination rejected the channel.
708 *
709 * @param ch Rejected channel.
710 */
711static void
712send_client_nack (struct CadetChannel *ch)
713{
714 if (NULL == ch->root)
715 {
716 GNUNET_break (0);
717 return;
718 }
719 GML_send_channel_nack (ch->root, ch->lid_root);
720}
721
722
723/**
724 * We haven't received an ACK after a certain time: restransmit the message.
725 *
726 * @param cls Closure (CadetChannelReliability with the message to restransmit)
727 */
728static void
729channel_retransmit_message (void *cls)
730{
731 struct CadetChannelReliability *rel = cls;
732 struct CadetReliableMessage *copy;
733 struct CadetChannel *ch;
734 struct GNUNET_CADET_ChannelAppDataMessage *payload;
735 int fwd;
736
737 rel->retry_task = NULL;
738 ch = rel->ch;
739 copy = rel->head_sent;
740 if (NULL == copy)
741 {
742 GNUNET_break (0); // FIXME tripped in rps testcase
743 return;
744 }
745
746 payload = (struct GNUNET_CADET_ChannelAppDataMessage *) &copy[1];
747 fwd = (rel == ch->root_rel);
748
749 /* Message not found in the queue that we are going to use. */
750 LOG (GNUNET_ERROR_TYPE_DEBUG, "RETRANSMIT MID %u\n", copy->mid);
751
752 GCCH_send_prebuilt_message (&payload->header, ch, fwd, copy);
753 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
754}
755
756
757/**
758 * We haven't received an Channel ACK after a certain time: resend the CREATE.
759 *
760 * @param cls Closure (CadetChannelReliability of the channel to recreate)
761 */
762static void
763channel_recreate (void *cls)
764{
765 struct CadetChannelReliability *rel = cls;
766
767 rel->retry_task = NULL;
768 LOG (GNUNET_ERROR_TYPE_DEBUG, "RE-CREATE\n");
769 GNUNET_STATISTICS_update (stats,
770 "# data retransmitted", 1, GNUNET_NO);
771
772 if (rel == rel->ch->root_rel)
773 {
774 send_create (rel->ch);
775 }
776 else if (rel == rel->ch->dest_rel)
777 {
778 send_ack (rel->ch, GNUNET_YES);
779 }
780 else
781 {
782 GNUNET_break (0);
783 }
784}
785
786
787/**
788 * Message has been sent: start retransmission timer.
789 *
790 * @param cls Closure (queue structure).
791 * @param t Tunnel.
792 * @param q Queue handler (no longer valid).
793 * @param type Type of message.
794 * @param size Size of the message.
795 */
796static void
797ch_message_sent (void *cls,
798 struct CadetTunnel *t,
799 struct CadetTunnelQueue *q,
800 uint16_t type, size_t size)
801{
802 struct CadetChannelQueue *chq = cls;
803 struct CadetReliableMessage *copy = chq->copy;
804 struct CadetChannelReliability *rel;
805
806 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel_message_sent callback %s\n",
807 GC_m2s (chq->type));
808
809 switch (chq->type)
810 {
811 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
812 LOG (GNUNET_ERROR_TYPE_DEBUG, "data MID %u sent\n", copy->mid);
813 GNUNET_assert (chq == copy->chq);
814 copy->timestamp = GNUNET_TIME_absolute_get ();
815 rel = copy->rel;
816 if (NULL == rel->retry_task)
817 {
818 LOG (GNUNET_ERROR_TYPE_DEBUG, " scheduling retry in %d * %s\n",
819 CADET_RETRANSMIT_MARGIN,
820 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
821 GNUNET_YES));
822 if (0 != rel->expected_delay.rel_value_us)
823 {
824 rel->retry_timer =
825 GNUNET_TIME_relative_saturating_multiply (rel->expected_delay,
826 CADET_RETRANSMIT_MARGIN);
827 }
828 else
829 {
830 rel->retry_timer = CADET_RETRANSMIT_TIME;
831 }
832 LOG (GNUNET_ERROR_TYPE_DEBUG, " using delay %s\n",
833 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
834 GNUNET_NO));
835 rel->retry_task =
836 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
837 &channel_retransmit_message, rel);
838 }
839 else
840 {
841 LOG (GNUNET_ERROR_TYPE_DEBUG, "retry running %p\n", rel->retry_task);
842 }
843 copy->chq = NULL;
844 break;
845
846
847 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
848 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
849 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
850 LOG (GNUNET_ERROR_TYPE_DEBUG, "sent %s\n", GC_m2s (chq->type));
851 rel = chq->rel;
852 GNUNET_assert (rel->uniq == chq);
853 rel->uniq = NULL;
854
855 if (CADET_CHANNEL_READY != rel->ch->state
856 && GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK != type
857 && GNUNET_NO == rel->ch->destroy)
858 {
859 GNUNET_assert (NULL == rel->retry_task);
860 LOG (GNUNET_ERROR_TYPE_DEBUG, "STD BACKOFF %s\n",
861 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer,
862 GNUNET_NO));
863 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
864 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
865 &channel_recreate, rel);
866 }
867 break;
868
869 default:
870 GNUNET_break (0);
871 }
872
873 GNUNET_free (chq);
874}
875
876
877/**
878 * send a channel create message.
879 *
880 * @param ch Channel for which to send.
881 */
882static void
883send_create (struct CadetChannel *ch)
884{
885 struct GNUNET_CADET_ChannelOpenMessage msgcc;
886
887 msgcc.header.size = htons (sizeof (msgcc));
888 msgcc.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN);
889 msgcc.ctn = ch->gid;
890 msgcc.port = ch->port;
891 msgcc.opt = htonl (channel_get_options (ch));
892
893 GCCH_send_prebuilt_message (&msgcc.header, ch, GNUNET_YES, NULL);
894}
895
896
897/**
898 * Confirm we got a channel create or FWD ack.
899 *
900 * @param ch The channel to confirm.
901 * @param fwd Should we send a FWD ACK? (going dest->root)
902 */
903static void
904send_ack (struct CadetChannel *ch, int fwd)
905{
906 struct GNUNET_CADET_ChannelManageMessage msg;
907
908 msg.header.size = htons (sizeof (msg));
909 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK);
910 LOG (GNUNET_ERROR_TYPE_DEBUG,
911 " sending channel %s ack for channel %s\n",
912 GC_f2s (fwd), GCCH_2s (ch));
913
914 msg.ctn =ch->gid;
915 GCCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
916}
917
918
919/**
920 * Send a message and don't keep any info about it: we won't need to cancel it
921 * or resend it.
922 *
923 * @param msg Header of the message to fire away.
924 * @param ch Channel on which the message should go.
925 * @param force Is this a forced (undroppable) message?
926 */
927static void
928fire_and_forget (const struct GNUNET_MessageHeader *msg,
929 struct CadetChannel *ch,
930 int force)
931{
932 GNUNET_break (NULL ==
933 GCT_send_prebuilt_message (msg, ch->t, NULL,
934 force, NULL, NULL));
935}
936
937
938/**
939 * Notify that a channel create didn't succeed.
940 *
941 * @param ch The channel to reject.
942 */
943static void
944send_nack (struct CadetChannel *ch)
945{
946 struct GNUNET_CADET_ChannelManageMessage msg;
947
948 msg.header.size = htons (sizeof (msg));
949 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED);
950 LOG (GNUNET_ERROR_TYPE_DEBUG,
951 " sending channel NACK for channel %s\n",
952 GCCH_2s (ch));
953
954 msg.ctn = ch->gid;
955 GCCH_send_prebuilt_message (&msg.header, ch, GNUNET_NO, NULL);
956}
957
958
959/**
960 * Destroy all reliable messages queued for a channel,
961 * during a channel destruction.
962 * Frees the reliability structure itself.
963 *
964 * @param rel Reliability data for a channel.
965 */
966static void
967channel_rel_free_all (struct CadetChannelReliability *rel)
968{
969 struct CadetReliableMessage *copy;
970 struct CadetReliableMessage *next;
971
972 if (NULL == rel)
973 return;
974
975 for (copy = rel->head_recv; NULL != copy; copy = next)
976 {
977 next = copy->next;
978 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
979 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE ALL RECV %p\n", copy);
980 GNUNET_break (NULL == copy->chq);
981 GNUNET_free (copy);
982 }
983 for (copy = rel->head_sent; NULL != copy; copy = next)
984 {
985 next = copy->next;
986 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
987 LOG (GNUNET_ERROR_TYPE_DEBUG, " COPYFREE ALL SEND %p\n", copy);
988 if (NULL != copy->chq)
989 {
990 if (NULL != copy->chq->tq)
991 {
992 GCT_cancel (copy->chq->tq);
993 /* ch_message_sent will free copy->q */
994 }
995 else
996 {
997 GNUNET_free (copy->chq);
998 GNUNET_break (0);
999 }
1000 }
1001 GNUNET_free (copy);
1002 }
1003 if (NULL != rel->uniq && NULL != rel->uniq->tq)
1004 {
1005 GCT_cancel (rel->uniq->tq);
1006 /* ch_message_sent is called freeing uniq */
1007 }
1008 if (NULL != rel->retry_task)
1009 {
1010 GNUNET_SCHEDULER_cancel (rel->retry_task);
1011 rel->retry_task = NULL;
1012 }
1013 GNUNET_free (rel);
1014}
1015
1016
1017/**
1018 * Mark future messages as ACK'd.
1019 *
1020 * @param rel Reliability data.
1021 * @param msg DataACK message with a bitfield of future ACK'd messages.
1022 *
1023 * @return How many messages have been freed.
1024 */
1025static unsigned int
1026channel_rel_free_sent (struct CadetChannelReliability *rel,
1027 const struct GNUNET_CADET_ChannelDataAckMessage *msg)
1028{
1029 struct CadetReliableMessage *copy;
1030 struct CadetReliableMessage *next;
1031 uint64_t bitfield;
1032 uint64_t mask;
1033 uint32_t mid;
1034 uint32_t target;
1035 unsigned int i;
1036 unsigned int r;
1037
1038 bitfield = msg->futures;
1039 mid = ntohl (msg->mid);
1040 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable %u %lX\n", mid, bitfield);
1041 LOG (GNUNET_ERROR_TYPE_DEBUG, " rel %p, head %p\n", rel, rel->head_sent);
1042 for (i = 0, r = 0, copy = rel->head_sent;
1043 i < 64 && NULL != copy && 0 != bitfield;
1044 i++)
1045 {
1046 LOG (GNUNET_ERROR_TYPE_DEBUG, " trying bit %u (mid %u)\n", i, mid + i + 1);
1047 mask = 0x1LL << i;
1048 if (0 == (bitfield & mask))
1049 continue;
1050
1051 LOG (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
1052 /* Bit was set, clear the bit from the bitfield */
1053 bitfield &= ~mask;
1054
1055 /* The i-th bit was set. Do we have that copy? */
1056 /* Skip copies with mid < target */
1057 target = mid + i + 1;
1058 LOG (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
1059 while (NULL != copy && GC_is_pid_bigger (target, copy->mid))
1060 copy = copy->next;
1061
1062 /* Did we run out of copies? (previously freed, it's ok) */
1063 if (NULL == copy)
1064 {
1065 LOG (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
1066 return r;
1067 }
1068
1069 /* Did we overshoot the target? (previously freed, it's ok) */
1070 if (GC_is_pid_bigger (copy->mid, target))
1071 {
1072 LOG (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
1073 i += copy->mid - target - 1; /* MID: 90, t = 85, i += 4 (i++ later) */
1074 mask = (0x1LL << (i + 1)) - 1; /* Mask = i-th bit and all before */
1075 bitfield &= ~mask; /* Clear all bits up to MID - 1 */
1076 continue;
1077 }
1078
1079 /* Now copy->mid == target, free it */
1080 next = copy->next;
1081 GNUNET_break (GNUNET_YES != rel_message_free (copy, GNUNET_YES));
1082 r++;
1083 copy = next;
1084 }
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
1086 return r;
1087}
1088
1089
1090/**
1091 * Destroy a reliable message after it has been acknowledged, either by
1092 * direct mid ACK or bitfield. Updates the appropriate data structures and
1093 * timers and frees all memory.
1094 *
1095 * @param copy Message that is no longer needed: remote peer got it.
1096 * @param update_time Is the timing information relevant?
1097 * If this message is ACK in a batch the timing information
1098 * is skewed by the retransmission, count only for the
1099 * retransmitted message.
1100 *
1101 * @return #GNUNET_YES if channel was destroyed as a result of the call,
1102 * #GNUNET_NO otherwise.
1103 */
1104static int
1105rel_message_free (struct CadetReliableMessage *copy, int update_time)
1106{
1107 struct CadetChannelReliability *rel;
1108 struct GNUNET_TIME_Relative time;
1109
1110 rel = copy->rel;
1111 LOG (GNUNET_ERROR_TYPE_DEBUG, "Freeing %u\n", copy->mid);
1112 if (GNUNET_YES == update_time)
1113 {
1114 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
1115 if (0 == rel->expected_delay.rel_value_us)
1116 rel->expected_delay = time;
1117 else
1118 {
1119 rel->expected_delay.rel_value_us *= 7;
1120 rel->expected_delay.rel_value_us += time.rel_value_us;
1121 rel->expected_delay.rel_value_us /= 8;
1122 }
1123 LOG (GNUNET_ERROR_TYPE_DEBUG, " message time %12s\n",
1124 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
1125 LOG (GNUNET_ERROR_TYPE_DEBUG, " new delay %12s\n",
1126 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
1127 GNUNET_NO));
1128 rel->retry_timer = rel->expected_delay;
1129 }
1130 else
1131 {
1132 LOG (GNUNET_ERROR_TYPE_DEBUG, "batch free, ignoring timing\n");
1133 }
1134 rel->ch->pending_messages--;
1135 if (NULL != copy->chq)
1136 {
1137 GCT_cancel (copy->chq->tq);
1138 /* copy->q is set to NULL by ch_message_sent */
1139 }
1140 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, " free send copy MID %u at %p\n",
1142 copy->mid, copy);
1143 GNUNET_free (copy);
1144
1145 if (GNUNET_NO != rel->ch->destroy && 0 == rel->ch->pending_messages)
1146 {
1147 GCCH_destroy (rel->ch);
1148 return GNUNET_YES;
1149 }
1150 return GNUNET_NO;
1151}
1152
1153
1154/**
1155 * Channel was ACK'd by remote peer, mark as ready and cancel retransmission.
1156 *
1157 * @param ch Channel to mark as ready.
1158 * @param fwd Was the ACK message a FWD ACK? (dest->root, SYNACK)
1159 */
1160static void
1161channel_confirm (struct CadetChannel *ch, int fwd)
1162{
1163 struct CadetChannelReliability *rel;
1164 enum CadetChannelState oldstate;
1165
1166 rel = fwd ? ch->root_rel : ch->dest_rel;
1167 if (NULL == rel)
1168 {
1169 GNUNET_break (GNUNET_NO != ch->destroy);
1170 return;
1171 }
1172 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel confirm %s %s\n",
1173 GC_f2s (fwd), GCCH_2s (ch));
1174 oldstate = ch->state;
1175 ch->state = CADET_CHANNEL_READY;
1176
1177 if (CADET_CHANNEL_READY != oldstate || GNUNET_YES == is_loopback (ch))
1178 {
1179 rel->client_ready = GNUNET_YES;
1180 rel->expected_delay = rel->retry_timer;
1181 LOG (GNUNET_ERROR_TYPE_DEBUG, " confirm retry timer %s\n",
1182 GNUNET_STRINGS_relative_time_to_string (rel->retry_timer, GNUNET_NO));
1183 if (GCT_get_connections_buffer (ch->t) > 0 || GCT_is_loopback (ch->t))
1184 send_client_ack (ch, fwd);
1185
1186 if (NULL != rel->retry_task)
1187 {
1188 GNUNET_SCHEDULER_cancel (rel->retry_task);
1189 rel->retry_task = NULL;
1190 }
1191 else if (NULL != rel->uniq)
1192 {
1193 GCT_cancel (rel->uniq->tq);
1194 /* ch_message_sent will free and NULL uniq */
1195 }
1196 else if (GNUNET_NO == is_loopback (ch))
1197 {
1198 /* We SHOULD have been trying to retransmit this! */
1199 GNUNET_break (0);
1200 }
1201 }
1202
1203 /* In case of a FWD ACK (SYNACK) send a BCK ACK (ACK). */
1204 if (GNUNET_YES == fwd)
1205 send_ack (ch, GNUNET_NO);
1206}
1207
1208
1209/**
1210 * Save a copy to retransmit in case it gets lost.
1211 *
1212 * Initializes all needed callbacks and timers.
1213 *
1214 * @param ch Channel this message goes on.
1215 * @param msg Message to copy.
1216 * @param fwd Is this fwd traffic?
1217 */
1218static struct CadetReliableMessage *
1219channel_save_copy (struct CadetChannel *ch,
1220 const struct GNUNET_MessageHeader *msg,
1221 int fwd)
1222{
1223 struct CadetChannelReliability *rel;
1224 struct CadetReliableMessage *copy;
1225 uint32_t mid;
1226 uint16_t type;
1227 uint16_t size;
1228
1229 rel = fwd ? ch->root_rel : ch->dest_rel;
1230 mid = rel->mid_send - 1;
1231 type = ntohs (msg->type);
1232 size = ntohs (msg->size);
1233
1234 LOG (GNUNET_ERROR_TYPE_DEBUG, "save MID %u %s\n", mid, GC_m2s (type));
1235 copy = GNUNET_malloc (sizeof (struct CadetReliableMessage) + size);
1236 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", copy);
1237 copy->mid = mid;
1238 copy->rel = rel;
1239 copy->type = type;
1240 GNUNET_memcpy (&copy[1], msg, size);
1241 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
1242 ch->pending_messages++;
1243
1244 return copy;
1245}
1246
1247
1248/**
1249 * Create a new channel.
1250 *
1251 * @param t Tunnel this channel is in.
1252 * @param owner Client that owns the channel, NULL for foreign channels.
1253 * @param lid_root Local ID for root client.
1254 *
1255 * @return A new initialized channel. NULL on error.
1256 */
1257static struct CadetChannel *
1258channel_new (struct CadetTunnel *t,
1259 struct CadetClient *owner,
1260 struct GNUNET_CADET_ClientChannelNumber lid_root)
1261{
1262 struct CadetChannel *ch;
1263
1264 ch = GNUNET_new (struct CadetChannel);
1265 ch->root = owner;
1266 ch->lid_root = lid_root;
1267 ch->t = t;
1268
1269 GNUNET_STATISTICS_update (stats, "# channels", 1, GNUNET_NO);
1270
1271 if (NULL != owner)
1272 {
1273 ch->gid = GCT_get_next_ctn (t);
1274 GML_channel_add (owner, lid_root, ch);
1275 }
1276 GCT_add_channel (t, ch);
1277
1278 return ch;
1279}
1280
1281
1282/**
1283 * Handle a loopback message: call the appropriate handler for the message type.
1284 *
1285 * @param ch Channel this message is on.
1286 * @param msgh Message header.
1287 * @param fwd Is this FWD traffic?
1288 */
1289void
1290handle_loopback (struct CadetChannel *ch,
1291 const struct GNUNET_MessageHeader *msgh,
1292 int fwd)
1293{
1294 uint16_t type;
1295
1296 type = ntohs (msgh->type);
1297 LOG (GNUNET_ERROR_TYPE_DEBUG,
1298 "Loopback %s %s message!\n",
1299 GC_f2s (fwd), GC_m2s (type));
1300
1301 switch (type)
1302 {
1303 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
1304 /* Don't send hop ACK, wait for client to ACK */
1305 LOG (GNUNET_ERROR_TYPE_DEBUG, "SEND loopback %u (%u)\n",
1306 ntohl (((struct GNUNET_CADET_ChannelAppDataMessage *) msgh)->mid), ntohs (msgh->size));
1307 GCCH_handle_data (ch, (struct GNUNET_CADET_ChannelAppDataMessage *) msgh, fwd);
1308 break;
1309
1310 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
1311 GCCH_handle_data_ack (ch,
1312 (const struct GNUNET_CADET_ChannelDataAckMessage *) msgh, fwd);
1313 break;
1314
1315 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
1316 GCCH_handle_create (ch->t,
1317 (const struct GNUNET_CADET_ChannelOpenMessage *) msgh);
1318 break;
1319
1320 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
1321 GCCH_handle_ack (ch,
1322 (const struct GNUNET_CADET_ChannelManageMessage *) msgh,
1323 fwd);
1324 break;
1325
1326 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
1327 GCCH_handle_nack (ch);
1328 break;
1329
1330 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1331 GCCH_handle_destroy (ch,
1332 (const struct GNUNET_CADET_ChannelManageMessage *) msgh,
1333 fwd);
1334 break;
1335
1336 default:
1337 GNUNET_break_op (0);
1338 LOG (GNUNET_ERROR_TYPE_DEBUG,
1339 "end-to-end message not known (%u)\n",
1340 ntohs (msgh->type));
1341 }
1342}
1343
1344
1345
1346/******************************************************************************/
1347/******************************** API ***********************************/
1348/******************************************************************************/
1349
1350/**
1351 * Destroy a channel and free all resources.
1352 *
1353 * @param ch Channel to destroy.
1354 */
1355void
1356GCCH_destroy (struct CadetChannel *ch)
1357{
1358 struct CadetClient *c;
1359 struct CadetTunnel *t;
1360
1361 if (NULL == ch)
1362 return;
1363 if (2 == ch->destroy)
1364 return; /* recursive call */
1365 ch->destroy = 2;
1366
1367 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying channel %s:%u\n",
1368 GCT_2s (ch->t), ch->gid);
1369 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
1370
1371 c = ch->root;
1372 if (NULL != c)
1373 {
1374 GML_channel_remove (c, ch->lid_root, ch);
1375 }
1376
1377 c = ch->dest;
1378 if (NULL != c)
1379 {
1380 GML_channel_remove (c, ch->lid_dest, ch);
1381 }
1382
1383 channel_rel_free_all (ch->root_rel);
1384 channel_rel_free_all (ch->dest_rel);
1385
1386 t = ch->t;
1387 GCT_remove_channel (t, ch);
1388 GNUNET_STATISTICS_update (stats, "# channels", -1, GNUNET_NO);
1389
1390 GNUNET_free (ch);
1391 GCT_destroy_if_empty (t);
1392}
1393
1394
1395/**
1396 * Get the channel's public ID.
1397 *
1398 * @param ch Channel.
1399 *
1400 * @return ID used to identify the channel with the remote peer.
1401 */
1402struct GNUNET_CADET_ChannelTunnelNumber
1403GCCH_get_id (const struct CadetChannel *ch)
1404{
1405 return ch->gid;
1406}
1407
1408
1409/**
1410 * Get the channel tunnel.
1411 *
1412 * @param ch Channel to get the tunnel from.
1413 *
1414 * @return tunnel of the channel.
1415 */
1416struct CadetTunnel *
1417GCCH_get_tunnel (const struct CadetChannel *ch)
1418{
1419 return ch->t;
1420}
1421
1422
1423/**
1424 * Get free buffer space towards the client on a specific channel.
1425 *
1426 * @param ch Channel.
1427 * @param fwd Is query about FWD traffic?
1428 *
1429 * @return Free buffer space [0 - 64]
1430 */
1431unsigned int
1432GCCH_get_buffer (struct CadetChannel *ch, int fwd)
1433{
1434 struct CadetChannelReliability *rel;
1435
1436 rel = fwd ? ch->dest_rel : ch->root_rel;
1437 LOG (GNUNET_ERROR_TYPE_DEBUG, " get buffer, channel %s\n", GCCH_2s (ch));
1438 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
1439 /* If rel is NULL it means that the end is not yet created,
1440 * most probably is a loopback channel at the point of sending
1441 * the ChannelCreate to itself.
1442 */
1443 if (NULL == rel)
1444 {
1445 LOG (GNUNET_ERROR_TYPE_DEBUG, " rel is NULL: max\n");
1446 return 64;
1447 }
1448
1449 LOG (GNUNET_ERROR_TYPE_DEBUG, " n_recv %d\n", rel->n_recv);
1450 return (64 - rel->n_recv);
1451}
1452
1453
1454/**
1455 * Get flow control status of end point: is client allow to send?
1456 *
1457 * @param ch Channel.
1458 * @param fwd Is query about FWD traffic? (Request root status).
1459 *
1460 * @return #GNUNET_YES if client is allowed to send us data.
1461 */
1462int
1463GCCH_get_allowed (struct CadetChannel *ch, int fwd)
1464{
1465 struct CadetChannelReliability *rel;
1466
1467 rel = fwd ? ch->root_rel : ch->dest_rel;
1468
1469 if (NULL == rel)
1470 {
1471 /* Probably shutting down: root/dest NULL'ed to mark disconnection */
1472 GNUNET_break (GNUNET_NO != ch->destroy);
1473 return 0;
1474 }
1475
1476 return rel->client_allowed;
1477}
1478
1479
1480/**
1481 * Is the root client for this channel on this peer?
1482 *
1483 * @param ch Channel.
1484 * @param fwd Is this for fwd traffic?
1485 *
1486 * @return #GNUNET_YES in case it is.
1487 */
1488int
1489GCCH_is_origin (struct CadetChannel *ch, int fwd)
1490{
1491 struct CadetClient *c;
1492
1493 c = fwd ? ch->root : ch->dest;
1494 return NULL != c;
1495}
1496
1497
1498/**
1499 * Is the destination client for this channel on this peer?
1500 *
1501 * @param ch Channel.
1502 * @param fwd Is this for fwd traffic?
1503 *
1504 * @return #GNUNET_YES in case it is.
1505 */
1506int
1507GCCH_is_terminal (struct CadetChannel *ch, int fwd)
1508{
1509 struct CadetClient *c;
1510
1511 c = fwd ? ch->dest : ch->root;
1512 return NULL != c;
1513}
1514
1515
1516/**
1517 * Send an end-to-end ACK message for the most recent in-sequence payload.
1518 *
1519 * If channel is not reliable, do nothing.
1520 *
1521 * @param ch Channel this is about.
1522 * @param fwd Is for FWD traffic? (ACK dest->owner)
1523 */
1524void
1525GCCH_send_data_ack (struct CadetChannel *ch, int fwd)
1526{
1527 struct GNUNET_CADET_ChannelDataAckMessage msg;
1528 struct CadetChannelReliability *rel;
1529 struct CadetReliableMessage *copy;
1530 unsigned int delta;
1531 uint64_t mask;
1532 uint32_t ack;
1533
1534 if (GNUNET_NO == ch->reliable)
1535 return;
1536
1537 rel = fwd ? ch->dest_rel : ch->root_rel;
1538 ack = rel->mid_recv - 1;
1539
1540 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK);
1541 msg.header.size = htons (sizeof (msg));
1542 msg.ctn = ch->gid;
1543 msg.mid = htonl (ack);
1544
1545 msg.futures = 0LL;
1546 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
1547 {
1548 if (copy->type != GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA)
1549 {
1550 LOG (GNUNET_ERROR_TYPE_DEBUG, " Type %s, expected DATA\n",
1551 GC_m2s (copy->type));
1552 continue;
1553 }
1554 GNUNET_assert (GC_is_pid_bigger(copy->mid, ack));
1555 delta = copy->mid - (ack + 1);
1556 if (63 < delta)
1557 break;
1558 mask = 0x1LL << delta;
1559 msg.futures |= mask;
1560 LOG (GNUNET_ERROR_TYPE_DEBUG,
1561 " setting bit for %u (delta %u) (%lX) -> %lX\n",
1562 copy->mid, delta, mask, msg.futures);
1563 }
1564
1565 GCCH_send_prebuilt_message (&msg.header, ch, !fwd, NULL);
1566 LOG (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
1567}
1568
1569
1570/**
1571 * Allow a client to send us more data, in case it was choked.
1572 *
1573 * @param ch Channel.
1574 * @param fwd Is this about FWD traffic? (Root client).
1575 */
1576void
1577GCCH_allow_client (struct CadetChannel *ch, int fwd)
1578{
1579 struct CadetChannelReliability *rel;
1580 unsigned int buffer;
1581
1582 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMCH allow\n");
1583
1584 if (CADET_CHANNEL_READY != ch->state)
1585 {
1586 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel not ready yet!\n");
1587 return;
1588 }
1589
1590 if (GNUNET_YES == ch->reliable)
1591 {
1592 rel = fwd ? ch->root_rel : ch->dest_rel;
1593 if (NULL == rel)
1594 {
1595 GNUNET_break (GNUNET_NO != ch->destroy);
1596 return;
1597 }
1598 if (NULL != rel->head_sent)
1599 {
1600 if (64 <= rel->mid_send - rel->head_sent->mid)
1601 {
1602 LOG (GNUNET_ERROR_TYPE_DEBUG, " too big MID gap! Wait for ACK.\n");
1603 return;
1604 }
1605 else
1606 {
1607 LOG (GNUNET_ERROR_TYPE_DEBUG, " gap ok: %u - %u\n",
1608 rel->head_sent->mid, rel->mid_send);
1609 struct CadetReliableMessage *aux;
1610 for (aux = rel->head_sent; NULL != aux; aux = aux->next)
1611 {
1612 LOG (GNUNET_ERROR_TYPE_DEBUG, " - sent mid %u\n", aux->mid);
1613 }
1614 }
1615 }
1616 else
1617 {
1618 LOG (GNUNET_ERROR_TYPE_DEBUG, " head sent is NULL\n");
1619 }
1620 }
1621
1622 if (is_loopback (ch))
1623 buffer = GCCH_get_buffer (ch, fwd);
1624 else
1625 buffer = GCT_get_connections_buffer (ch->t);
1626
1627 if (0 == buffer)
1628 {
1629 LOG (GNUNET_ERROR_TYPE_DEBUG, " no buffer space.\n");
1630 return;
1631 }
1632
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space %u, allowing\n", buffer);
1634 send_client_ack (ch, fwd);
1635}
1636
1637
1638/**
1639 * Log channel info.
1640 *
1641 * @param ch Channel.
1642 * @param level Debug level to use.
1643 */
1644void
1645GCCH_debug (struct CadetChannel *ch, enum GNUNET_ErrorType level)
1646{
1647 int do_log;
1648
1649 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
1650 "cadet-chn",
1651 __FILE__, __FUNCTION__, __LINE__);
1652 if (0 == do_log)
1653 return;
1654
1655 if (NULL == ch)
1656 {
1657 LOG2 (level, "CHN *** DEBUG NULL CHANNEL ***\n");
1658 return;
1659 }
1660 LOG2 (level, "CHN Channel %s:%X (%p)\n", GCT_2s (ch->t), ch->gid, ch);
1661 LOG2 (level, "CHN root %p/%p\n", ch->root, ch->root_rel);
1662 if (NULL != ch->root)
1663 {
1664 LOG2 (level, "CHN cli %s\n", GML_2s (ch->root));
1665 LOG2 (level, "CHN ready %s\n", ch->root_rel->client_ready ? "YES" : "NO");
1666 LOG2 (level, "CHN id %X\n", ch->lid_root.channel_of_client);
1667 LOG2 (level, "CHN recv %d\n", ch->root_rel->n_recv);
1668 LOG2 (level, "CHN MID r: %d, s: %d\n",
1669 ch->root_rel->mid_recv, ch->root_rel->mid_send);
1670 }
1671 LOG2 (level, "CHN dest %p/%p\n",
1672 ch->dest, ch->dest_rel);
1673 if (NULL != ch->dest)
1674 {
1675 LOG2 (level, "CHN cli %s\n", GML_2s (ch->dest));
1676 LOG2 (level, "CHN ready %s\n", ch->dest_rel->client_ready ? "YES" : "NO");
1677 LOG2 (level, "CHN id %X\n", ch->lid_dest);
1678 LOG2 (level, "CHN recv %d\n", ch->dest_rel->n_recv);
1679 LOG2 (level, "CHN MID r: %d, s: %d\n",
1680 ch->dest_rel->mid_recv, ch->dest_rel->mid_send);
1681
1682 }
1683}
1684
1685
1686/**
1687 * Handle an ACK given by a client.
1688 *
1689 * Mark client as ready and send him any buffered data we could have for him.
1690 *
1691 * @param ch Channel.
1692 * @param fwd Is this a "FWD ACK"? (FWD ACKs are sent by dest and go BCK)
1693 */
1694void
1695GCCH_handle_local_ack (struct CadetChannel *ch, int fwd)
1696{
1697 struct CadetChannelReliability *rel;
1698 struct CadetClient *c;
1699
1700 rel = fwd ? ch->dest_rel : ch->root_rel;
1701 c = fwd ? ch->dest : ch->root;
1702
1703 rel->client_ready = GNUNET_YES;
1704 send_client_buffered_data (ch, c, fwd);
1705
1706 if (GNUNET_YES == ch->destroy && 0 == rel->n_recv)
1707 {
1708 send_destroy (ch, GNUNET_YES);
1709 GCCH_destroy (ch);
1710 return;
1711 }
1712 /* if loopback is marked for destruction, no need to ACK to the other peer,
1713 * it requested the destruction and is already gone, therefore, else if.
1714 */
1715 else if (is_loopback (ch))
1716 {
1717 unsigned int buffer;
1718
1719 buffer = GCCH_get_buffer (ch, fwd);
1720 if (0 < buffer)
1721 GCCH_allow_client (ch, fwd);
1722
1723 return;
1724 }
1725 GCT_send_connection_acks (ch->t);
1726}
1727
1728
1729/**
1730 * Handle data given by a client.
1731 *
1732 * Check whether the client is allowed to send in this tunnel, save if channel
1733 * is reliable and send an ACK to the client if there is still buffer space
1734 * in the tunnel.
1735 *
1736 * @param ch Channel.
1737 * @param c Client which sent the data.
1738 * @param fwd Is this a FWD data?
1739 * @param message Data message.
1740 * @param size Size of data.
1741 *
1742 * @return #GNUNET_OK if everything goes well, #GNUNET_SYSERR in case of en error.
1743 */
1744int
1745GCCH_handle_local_data (struct CadetChannel *ch,
1746 struct CadetClient *c,
1747 int fwd,
1748 const struct GNUNET_MessageHeader *message,
1749 size_t size)
1750{
1751 struct CadetChannelReliability *rel;
1752 struct GNUNET_CADET_ChannelAppDataMessage *payload;
1753 uint16_t p2p_size = sizeof(struct GNUNET_CADET_ChannelAppDataMessage) + size;
1754 unsigned char cbuf[p2p_size];
1755 unsigned char buffer;
1756
1757 /* Is the client in the channel? */
1758 if ( !( (fwd &&
1759 ch->root == c)
1760 ||
1761 (!fwd &&
1762 ch->dest == c) ) )
1763 {
1764 GNUNET_break_op (0);
1765 return GNUNET_SYSERR;
1766 }
1767
1768 rel = fwd ? ch->root_rel : ch->dest_rel;
1769
1770 if (GNUNET_NO == rel->client_allowed)
1771 {
1772 GNUNET_break_op (0);
1773 return GNUNET_SYSERR;
1774 }
1775
1776 rel->client_allowed = GNUNET_NO;
1777
1778 /* Ok, everything is correct, send the message. */
1779 payload = (struct GNUNET_CADET_ChannelAppDataMessage *) cbuf;
1780 payload->mid = htonl (rel->mid_send);
1781 rel->mid_send++;
1782 GNUNET_memcpy (&payload[1], message, size);
1783 payload->header.size = htons (p2p_size);
1784 payload->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA);
1785 payload->ctn = ch->gid;
1786 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channel...\n");
1787 GCCH_send_prebuilt_message (&payload->header, ch, fwd, NULL);
1788
1789 if (is_loopback (ch))
1790 buffer = GCCH_get_buffer (ch, fwd);
1791 else
1792 buffer = GCT_get_connections_buffer (ch->t);
1793
1794 if (0 < buffer)
1795 GCCH_allow_client (ch, fwd);
1796
1797 return GNUNET_OK;
1798}
1799
1800
1801/**
1802 * Handle a channel destroy requested by a client.
1803 *
1804 * TODO: add "reason" field
1805 *
1806 * Destroy the channel and the tunnel in case this was the last channel.
1807 *
1808 * @param ch Channel.
1809 * @param c Client that requested the destruction (to avoid notifying him).
1810 * @param is_root Is the request coming from root?
1811 */
1812void
1813GCCH_handle_local_destroy (struct CadetChannel *ch,
1814 struct CadetClient *c,
1815 int is_root)
1816{
1817 ch->destroy = GNUNET_YES;
1818 /* Cleanup after the tunnel */
1819 if (GNUNET_NO == is_root && c == ch->dest)
1820 {
1821 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is destination.\n", GML_2s (c));
1822 GML_client_delete_channel (c, ch, ch->lid_dest);
1823 ch->dest = NULL;
1824 }
1825 if (GNUNET_YES == is_root && c == ch->root)
1826 {
1827 LOG (GNUNET_ERROR_TYPE_DEBUG, " Client %s is owner.\n", GML_2s (c));
1828 GML_client_delete_channel (c, ch, ch->lid_root);
1829 ch->root = NULL;
1830 }
1831
1832 send_destroy (ch, GNUNET_NO);
1833 if (0 == ch->pending_messages)
1834 GCCH_destroy (ch);
1835}
1836
1837
1838/**
1839 * Handle a channel create requested by a client.
1840 *
1841 * Create the channel and the tunnel in case this was the first0 channel.
1842 *
1843 * @param c Client that requested the creation (will be the root).
1844 * @param msg Create Channel message.
1845 *
1846 * @return #GNUNET_OK if everything went fine, #GNUNET_SYSERR otherwise.
1847 */
1848int
1849GCCH_handle_local_create (struct CadetClient *c,
1850 struct GNUNET_CADET_LocalChannelCreateMessage *msg)
1851{
1852 struct CadetChannel *ch;
1853 struct CadetTunnel *t;
1854 struct CadetPeer *peer;
1855 struct GNUNET_CADET_ClientChannelNumber ccn;
1856
1857 LOG (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
1858 GNUNET_i2s (&msg->peer), GNUNET_h2s (&msg->port));
1859 ccn = msg->ccn;
1860
1861 /* Sanity check for duplicate channel IDs */
1862 if (NULL != GML_channel_get (c, ccn))
1863 {
1864 GNUNET_break (0);
1865 return GNUNET_SYSERR;
1866 }
1867
1868 peer = GCP_get (&msg->peer, GNUNET_YES);
1869 GCP_add_tunnel (peer);
1870 t = GCP_get_tunnel (peer);
1871
1872 if (GCP_get_short_id (peer) == myid)
1873 {
1874 GCT_change_cstate (t, CADET_TUNNEL_READY);
1875 }
1876 else
1877 {
1878 /* FIXME change to a tunnel API, eliminate ch <-> peer connection */
1879 GCP_connect (peer);
1880 }
1881
1882 /* Create channel */
1883 ch = channel_new (t, c, ccn);
1884 if (NULL == ch)
1885 {
1886 GNUNET_break (0);
1887 return GNUNET_SYSERR;
1888 }
1889 ch->port = msg->port;
1890 channel_set_options (ch, ntohl (msg->opt));
1891
1892 /* In unreliable channels, we'll use the DLL to buffer BCK data */
1893 ch->root_rel = GNUNET_new (struct CadetChannelReliability);
1894 ch->root_rel->ch = ch;
1895 ch->root_rel->retry_timer = CADET_RETRANSMIT_TIME;
1896 ch->root_rel->expected_delay.rel_value_us = 0;
1897
1898 LOG (GNUNET_ERROR_TYPE_DEBUG, "CREATED CHANNEL %s\n", GCCH_2s (ch));
1899
1900 send_create (ch);
1901
1902 return GNUNET_OK;
1903}
1904
1905
1906/**
1907 * Handler for cadet network payload traffic.
1908 *
1909 * @param ch Channel for the message.
1910 * @param msg Unencryted data message.
1911 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1912 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1913 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1914 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1915 */
1916void
1917GCCH_handle_data (struct CadetChannel *ch,
1918 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
1919 int fwd)
1920{
1921 struct CadetChannelReliability *rel;
1922 struct CadetClient *c;
1923 struct GNUNET_MessageHeader *payload_msg;
1924 uint32_t mid;
1925 uint16_t payload_type;
1926 uint16_t payload_size;
1927
1928 /* If this is a remote (non-loopback) channel, find 'fwd'. */
1929 if (GNUNET_SYSERR == fwd)
1930 {
1931 if (is_loopback (ch))
1932 {
1933 /* It is a loopback channel after all... */
1934 GNUNET_break (0);
1935 return;
1936 }
1937 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
1938 }
1939
1940 /* Initialize FWD/BCK data */
1941 c = fwd ? ch->dest : ch->root;
1942 rel = fwd ? ch->dest_rel : ch->root_rel;
1943
1944 if (NULL == c)
1945 {
1946 GNUNET_break (GNUNET_NO != ch->destroy);
1947 return;
1948 }
1949
1950 if (CADET_CHANNEL_READY != ch->state)
1951 {
1952 if (GNUNET_NO == fwd)
1953 {
1954 /* If we are the root, this means the other peer has sent traffic before
1955 * receiving our ACK. Even if the SYNACK goes missing, no traffic should
1956 * be sent before the ACK.
1957 */
1958 GNUNET_break_op (0);
1959 return;
1960 }
1961 /* If we are the dest, this means that the SYNACK got to the root but
1962 * the ACK went missing. Treat this as an ACK.
1963 */
1964 channel_confirm (ch, GNUNET_NO);
1965 }
1966
1967 payload_msg = (struct GNUNET_MessageHeader *) &msg[1];
1968 payload_type = ntohs (payload_msg->type);
1969 payload_size = ntohs (payload_msg->size);
1970
1971 GNUNET_STATISTICS_update (stats, "# messages received", 1, GNUNET_NO);
1972 GNUNET_STATISTICS_update (stats, "# bytes received", payload_size, GNUNET_NO);
1973
1974 mid = ntohl (msg->mid);
1975 LOG (GNUNET_ERROR_TYPE_INFO, "<== %s (%s %4u) on chan %s (%p) %s [%5u]\n",
1976 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA), GC_m2s (payload_type), mid,
1977 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
1978
1979 if ( (GNUNET_NO == ch->reliable) ||
1980 ( (! GC_is_pid_bigger (rel->mid_recv, mid)) &&
1981 GC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
1982 {
1983 if (GNUNET_YES == ch->reliable)
1984 {
1985 /* Is this the exact next expected messasge? */
1986 if (mid == rel->mid_recv)
1987 {
1988 LOG (GNUNET_ERROR_TYPE_DEBUG,
1989 "as expected, sending to client\n");
1990 send_client_data (ch, msg, fwd);
1991 }
1992 else
1993 {
1994 LOG (GNUNET_ERROR_TYPE_DEBUG,
1995 "save for later\n");
1996 add_buffered_data (msg, rel);
1997 }
1998 }
1999 else
2000 {
2001 /* Tunnel is unreliable: send to clients directly */
2002 /* FIXME: accept Out Of Order traffic */
2003 rel->mid_recv = mid + 1;
2004 send_client_data (ch, msg, fwd);
2005 }
2006 }
2007 else
2008 {
2009 GNUNET_STATISTICS_update (stats, "# duplicate MID", 1, GNUNET_NO);
2010 if (GC_is_pid_bigger (rel->mid_recv, mid))
2011 {
2012 GNUNET_break_op (0);
2013 LOG (GNUNET_ERROR_TYPE_WARNING,
2014 "MID %u on channel %s not expected (window: %u - %u). Dropping!\n",
2015 mid, GCCH_2s (ch), rel->mid_recv, rel->mid_recv + 63);
2016 }
2017 else
2018 {
2019 LOG (GNUNET_ERROR_TYPE_INFO,
2020 "Duplicate MID %u, channel %s (expecting MID %u). Re-sending ACK!\n",
2021 mid, GCCH_2s (ch), rel->mid_recv);
2022 if (NULL != rel->uniq)
2023 {
2024 LOG (GNUNET_ERROR_TYPE_WARNING,
2025 "We are trying to send an ACK, but don't seem have the "
2026 "bandwidth. Have you set enough [ats] QUOTA in your config?\n");
2027 }
2028
2029 }
2030 }
2031
2032 GCCH_send_data_ack (ch, fwd);
2033}
2034
2035
2036/**
2037 * Handler for cadet network traffic end-to-end ACKs.
2038 *
2039 * @param ch Channel on which we got this message.
2040 * @param msg Data message.
2041 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2042 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2043 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2044 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2045 */
2046void
2047GCCH_handle_data_ack (struct CadetChannel *ch,
2048 const struct GNUNET_CADET_ChannelDataAckMessage *msg,
2049 int fwd)
2050{
2051 struct CadetChannelReliability *rel;
2052 struct CadetReliableMessage *copy;
2053 struct CadetReliableMessage *next;
2054 uint32_t ack;
2055 int work;
2056
2057 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2058 if (GNUNET_SYSERR == fwd)
2059 {
2060 if (is_loopback (ch))
2061 {
2062 /* It is a loopback channel after all... */
2063 GNUNET_break (0);
2064 return;
2065 }
2066 /* Inverted: if message came 'FWD' is a 'BCK ACK'. */
2067 fwd = (NULL != ch->dest) ? GNUNET_NO : GNUNET_YES;
2068 }
2069
2070 ack = ntohl (msg->mid);
2071 LOG (GNUNET_ERROR_TYPE_INFO,
2072 "<== %s (0x%010lX %4u) on chan %s (%p) %s [%5u]\n",
2073 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK), msg->futures, ack,
2074 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2075
2076 if (GNUNET_YES == fwd)
2077 rel = ch->root_rel;
2078 else
2079 rel = ch->dest_rel;
2080
2081 if (NULL == rel)
2082 {
2083 GNUNET_break (GNUNET_NO != ch->destroy);
2084 return;
2085 }
2086
2087 /* Free ACK'd copies: no need to retransmit those anymore FIXME refactor */
2088 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
2089 {
2090 if (GC_is_pid_bigger (copy->mid, ack))
2091 {
2092 LOG (GNUNET_ERROR_TYPE_DEBUG, " head %u, out!\n", copy->mid);
2093 if (0 < channel_rel_free_sent (rel, msg))
2094 work = GNUNET_YES;
2095 break;
2096 }
2097 work = GNUNET_YES;
2098 LOG (GNUNET_ERROR_TYPE_DEBUG, " id %u\n", copy->mid);
2099 next = copy->next;
2100 if (GNUNET_YES == rel_message_free (copy, GNUNET_YES))
2101 {
2102 LOG (GNUNET_ERROR_TYPE_DEBUG, " channel destoyed\n");
2103 return;
2104 }
2105 }
2106
2107 /* ACK client if needed and possible */
2108 GCCH_allow_client (ch, fwd);
2109
2110 /* If some message was free'd, update the retransmission delay */
2111 if (GNUNET_YES == work)
2112 {
2113 if (NULL != rel->retry_task)
2114 {
2115 GNUNET_SCHEDULER_cancel (rel->retry_task);
2116 rel->retry_task = NULL;
2117 if (NULL != rel->head_sent && NULL == rel->head_sent->chq)
2118 {
2119 struct GNUNET_TIME_Absolute new_target;
2120 struct GNUNET_TIME_Relative delay;
2121
2122 delay = GNUNET_TIME_relative_saturating_multiply (rel->retry_timer,
2123 CADET_RETRANSMIT_MARGIN);
2124 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
2125 delay);
2126 delay = GNUNET_TIME_absolute_get_remaining (new_target);
2127 rel->retry_task =
2128 GNUNET_SCHEDULER_add_delayed (delay,
2129 &channel_retransmit_message,
2130 rel);
2131 }
2132 }
2133 else
2134 {
2135 /* Work was done but no task was pending.
2136 * Task was cancelled by a retransmission that is sitting in the queue.
2137 */
2138 // FIXME add test to make sure this is the case, probably add return
2139 // value to GCCH_send_prebuilt_message
2140 }
2141 }
2142}
2143
2144
2145/**
2146 * Handler for channel create messages.
2147 *
2148 * Does not have fwd parameter because it's always 'FWD': channel is incoming.
2149 *
2150 * @param t Tunnel this channel will be in.
2151 * @param msg Channel crate message.
2152 */
2153struct CadetChannel *
2154GCCH_handle_create (struct CadetTunnel *t,
2155 const struct GNUNET_CADET_ChannelOpenMessage *msg)
2156{
2157 struct GNUNET_CADET_ClientChannelNumber ccn;
2158 struct GNUNET_CADET_ChannelTunnelNumber gid;
2159 struct CadetChannel *ch;
2160 struct CadetClient *c;
2161 int new_channel;
2162 const struct GNUNET_HashCode *port;
2163
2164 gid = msg->ctn;
2165 ch = GCT_get_channel (t, gid);
2166 if (NULL == ch)
2167 {
2168 /* Create channel */
2169 ccn.channel_of_client = htonl (0);
2170 ch = channel_new (t, NULL, ccn);
2171 ch->gid = gid;
2172 channel_set_options (ch, ntohl (msg->opt));
2173 new_channel = GNUNET_YES;
2174 }
2175 else
2176 {
2177 new_channel = GNUNET_NO;
2178 }
2179 port = &msg->port;
2180
2181 LOG (GNUNET_ERROR_TYPE_INFO,
2182 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2183 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN), ccn, port,
2184 GCCH_2s (ch), ch, GC_f2s (GNUNET_YES), ntohs (msg->header.size));
2185
2186 if (GNUNET_YES == new_channel || GCT_is_loopback (t))
2187 {
2188 /* Find a destination client */
2189 ch->port = *port;
2190 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %s\n", GNUNET_h2s (port));
2191 c = GML_client_get_by_port (port);
2192 if (NULL == c)
2193 {
2194 LOG (GNUNET_ERROR_TYPE_DEBUG, " no client has port registered\n");
2195 if (is_loopback (ch))
2196 {
2197 LOG (GNUNET_ERROR_TYPE_DEBUG, " loopback: destroy on handler\n");
2198 send_nack (ch);
2199 }
2200 else
2201 {
2202 LOG (GNUNET_ERROR_TYPE_DEBUG, " not loopback: destroy now\n");
2203 send_nack (ch);
2204 GCCH_destroy (ch);
2205 }
2206 return NULL;
2207 }
2208 else
2209 {
2210 LOG (GNUNET_ERROR_TYPE_DEBUG, " client %p has port registered\n", c);
2211 }
2212
2213 add_destination (ch, c);
2214 if (GNUNET_YES == ch->reliable)
2215 LOG (GNUNET_ERROR_TYPE_DEBUG, "Reliable\n");
2216 else
2217 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not Reliable\n");
2218
2219 send_client_create (ch);
2220 ch->state = CADET_CHANNEL_SENT;
2221 }
2222 else
2223 {
2224 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate create channel\n");
2225 if (NULL != ch->dest_rel->retry_task)
2226 {
2227 LOG (GNUNET_ERROR_TYPE_DEBUG, " clearing retry task\n");
2228 /* we were waiting to re-send our 'SYNACK', wait no more! */
2229 GNUNET_SCHEDULER_cancel (ch->dest_rel->retry_task);
2230 ch->dest_rel->retry_task = NULL;
2231 }
2232 else if (NULL != ch->dest_rel->uniq)
2233 {
2234 /* we are waiting to for our 'SYNACK' to leave the queue, all done! */
2235 return ch;
2236 }
2237 }
2238 send_ack (ch, GNUNET_YES);
2239
2240 return ch;
2241}
2242
2243
2244/**
2245 * Handler for channel NACK messages.
2246 *
2247 * NACK messages always go dest -> root, no need for 'fwd' or 'msg' parameter.
2248 *
2249 * @param ch Channel.
2250 */
2251void
2252GCCH_handle_nack (struct CadetChannel *ch)
2253{
2254 LOG (GNUNET_ERROR_TYPE_INFO,
2255 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2256 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED), ch->gid, 0,
2257 GCCH_2s (ch), ch, "---", 0);
2258
2259 send_client_nack (ch);
2260 GCCH_destroy (ch);
2261}
2262
2263
2264/**
2265 * Handler for channel ack messages.
2266 *
2267 * @param ch Channel.
2268 * @param msg Message.
2269 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2270 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2271 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2272 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2273 */
2274void
2275GCCH_handle_ack (struct CadetChannel *ch,
2276 const struct GNUNET_CADET_ChannelManageMessage *msg,
2277 int fwd)
2278{
2279 LOG (GNUNET_ERROR_TYPE_INFO,
2280 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2281 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK), ch->gid, 0,
2282 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2283
2284 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2285 if (GNUNET_SYSERR == fwd)
2286 {
2287 if (is_loopback (ch))
2288 {
2289 /* It is a loopback channel after all... */
2290 GNUNET_break (0);
2291 return;
2292 }
2293 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2294 }
2295
2296 channel_confirm (ch, !fwd);
2297}
2298
2299
2300/**
2301 * Handler for channel destroy messages.
2302 *
2303 * @param ch Channel to be destroyed of.
2304 * @param msg Message.
2305 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2306 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2307 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2308 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2309 */
2310void
2311GCCH_handle_destroy (struct CadetChannel *ch,
2312 const struct GNUNET_CADET_ChannelManageMessage *msg,
2313 int fwd)
2314{
2315 struct CadetChannelReliability *rel;
2316
2317 LOG (GNUNET_ERROR_TYPE_INFO,
2318 "<== %s ( 0x%08X %4u) on chan %s (%p) %s [%5u]\n",
2319 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY), ch->gid, 0,
2320 GCCH_2s (ch), ch, GC_f2s (fwd), ntohs (msg->header.size));
2321
2322 /* If this is a remote (non-loopback) channel, find 'fwd'. */
2323 if (GNUNET_SYSERR == fwd)
2324 {
2325 if (is_loopback (ch))
2326 {
2327 /* It is a loopback channel after all... */
2328 GNUNET_break (0);
2329 return;
2330 }
2331 fwd = (NULL != ch->dest) ? GNUNET_YES : GNUNET_NO;
2332 }
2333
2334 GCCH_debug (ch, GNUNET_ERROR_TYPE_DEBUG);
2335 if ( (fwd && NULL == ch->dest) || (!fwd && NULL == ch->root) )
2336 {
2337 /* Not for us (don't destroy twice a half-open loopback channel) */
2338 return;
2339 }
2340
2341 rel = fwd ? ch->dest_rel : ch->root_rel;
2342 if (0 == rel->n_recv)
2343 {
2344 send_destroy (ch, GNUNET_YES);
2345 GCCH_destroy (ch);
2346 }
2347 else
2348 {
2349 ch->destroy = GNUNET_YES;
2350 }
2351}
2352
2353
2354/**
2355 * Sends an already built message on a channel.
2356 *
2357 * If the channel is on a loopback tunnel, notifies the appropriate destination
2358 * client locally.
2359 *
2360 * On a normal channel passes the message to the tunnel for encryption and
2361 * sending on a connection.
2362 *
2363 * This function DOES NOT save the message for retransmission.
2364 *
2365 * @param message Message to send. Function makes a copy of it.
2366 * @param ch Channel on which this message is transmitted.
2367 * @param fwd Is this a fwd message?
2368 * @param existing_copy This is a retransmission, don't save a copy.
2369 */
2370void
2371GCCH_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
2372 struct CadetChannel *ch, int fwd,
2373 void *existing_copy)
2374{
2375 struct CadetChannelQueue *chq;
2376 uint32_t data_id;
2377 uint16_t type;
2378 uint16_t size;
2379 char info[32];
2380
2381 type = ntohs (message->type);
2382 size = ntohs (message->size);
2383
2384 data_id = 0;
2385 switch (type)
2386 {
2387 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
2388 {
2389 struct GNUNET_CADET_ChannelAppDataMessage *data_msg;
2390 struct GNUNET_MessageHeader *payload_msg;
2391 uint16_t payload_type;
2392
2393 data_msg = (struct GNUNET_CADET_ChannelAppDataMessage *) message;
2394 data_id = ntohl (data_msg->mid);
2395 payload_msg = (struct GNUNET_MessageHeader *) &data_msg[1];
2396 payload_type = ntohs (payload_msg->type);
2397 strncpy (info, GC_m2s (payload_type), 31);
2398 info[31] = '\0';
2399 break;
2400 }
2401 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
2402 {
2403 struct GNUNET_CADET_ChannelDataAckMessage *ack_msg;
2404 ack_msg = (struct GNUNET_CADET_ChannelDataAckMessage *) message;
2405 data_id = ntohl (ack_msg->mid);
2406 SPRINTF (info, "0x%010lX",
2407 (unsigned long int) ack_msg->futures);
2408 break;
2409 }
2410 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
2411 {
2412 struct GNUNET_CADET_ChannelOpenMessage *cc_msg;
2413 cc_msg = (struct GNUNET_CADET_ChannelOpenMessage *) message;
2414 SPRINTF (info, " 0x%08X", ntohl (cc_msg->ctn.cn));
2415 break;
2416 }
2417 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
2418 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
2419 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2420 {
2421 struct GNUNET_CADET_ChannelManageMessage *m_msg;
2422 m_msg = (struct GNUNET_CADET_ChannelManageMessage *) message;
2423 SPRINTF (info, " 0x%08X", ntohl (m_msg->ctn.cn));
2424 break;
2425 }
2426 default:
2427 info[0] = '\0';
2428 }
2429 LOG (GNUNET_ERROR_TYPE_INFO,
2430 "==> %s (%12s %4u) on chan %s (%p) %s [%5u]\n",
2431 GC_m2s (type), info, data_id,
2432 GCCH_2s (ch), ch, GC_f2s (fwd), size);
2433
2434 if (GCT_is_loopback (ch->t))
2435 {
2436 handle_loopback (ch, message, fwd);
2437 return;
2438 }
2439
2440 switch (type)
2441 {
2442 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
2443 if (GNUNET_YES == ch->reliable)
2444 {
2445 chq = GNUNET_new (struct CadetChannelQueue);
2446 chq->type = type;
2447 if (NULL == existing_copy)
2448 chq->copy = channel_save_copy (ch, message, fwd);
2449 else
2450 {
2451 chq->copy = (struct CadetReliableMessage *) existing_copy;
2452 if (NULL != chq->copy->chq)
2453 {
2454 /* Last retransmission was queued but not yet sent!
2455 * This retransmission was scheduled by a ch_message_sent which
2456 * followed a very fast RTT, so the tiny delay made the
2457 * retransmission function to execute before the previous
2458 * retransmitted message even had a chance to leave the peer.
2459 * Cancel this message and wait until the pending
2460 * retransmission leaves the peer and ch_message_sent starts
2461 * the timer for the next one.
2462 */
2463 GNUNET_free (chq);
2464 LOG (GNUNET_ERROR_TYPE_DEBUG,
2465 " exisitng copy not yet transmitted!\n");
2466 return;
2467 }
2468 LOG (GNUNET_ERROR_TYPE_DEBUG,
2469 " using existing copy: %p {r:%p q:%p t:%u}\n",
2470 existing_copy,
2471 chq->copy->rel, chq->copy->chq, chq->copy->type);
2472 }
2473 LOG (GNUNET_ERROR_TYPE_DEBUG, " new chq: %p\n", chq);
2474 chq->copy->chq = chq;
2475 chq->tq = GCT_send_prebuilt_message (message, ch->t, NULL,
2476 GNUNET_YES,
2477 &ch_message_sent, chq);
2478 /* q itself is stored in copy */
2479 GNUNET_assert (NULL != chq->tq || GNUNET_NO != ch->destroy);
2480 }
2481 else
2482 {
2483 fire_and_forget (message, ch, GNUNET_NO);
2484 }
2485 break;
2486
2487
2488 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
2489 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
2490 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
2491 chq = GNUNET_new (struct CadetChannelQueue);
2492 chq->type = type;
2493 chq->rel = fwd ? ch->root_rel : ch->dest_rel;
2494 if (NULL != chq->rel->uniq)
2495 {
2496 if (NULL != chq->rel->uniq->tq)
2497 {
2498 GCT_cancel (chq->rel->uniq->tq);
2499 /* ch_message_sent is called, freeing and NULLing uniq */
2500 GNUNET_break (NULL == chq->rel->uniq);
2501 }
2502 else
2503 {
2504 GNUNET_break (0);
2505 GNUNET_free (chq->rel->uniq);
2506 }
2507 }
2508
2509 chq->rel->uniq = chq;
2510 chq->tq = GCT_send_prebuilt_message (message, ch->t, NULL, GNUNET_YES,
2511 &ch_message_sent, chq);
2512 if (NULL == chq->tq)
2513 {
2514 GNUNET_break (0);
2515 chq->rel->uniq = NULL;
2516 GCT_debug (ch->t, GNUNET_ERROR_TYPE_ERROR);
2517 GNUNET_free (chq);
2518 chq = NULL;
2519 return;
2520 }
2521 break;
2522
2523
2524 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2525 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
2526 fire_and_forget (message, ch, GNUNET_YES);
2527 break;
2528
2529
2530 default:
2531 GNUNET_break (0);
2532 LOG (GNUNET_ERROR_TYPE_WARNING, "type %s unknown!\n", GC_m2s (type));
2533 fire_and_forget (message, ch, GNUNET_YES);
2534 }
2535}
2536
2537
2538/**
2539 * Get the static string for identification of the channel.
2540 *
2541 * @param ch Channel.
2542 *
2543 * @return Static string with the channel IDs.
2544 */
2545const char *
2546GCCH_2s (const struct CadetChannel *ch)
2547{
2548 static char buf[64];
2549
2550 if (NULL == ch)
2551 return "(NULL Channel)";
2552
2553 SPRINTF (buf,
2554 "%s:%s gid:%X (%X / %X)",
2555 GCT_2s (ch->t),
2556 GNUNET_h2s (&ch->port),
2557 ntohl (ch->gid.cn),
2558 ntohl (ch->lid_root.channel_of_client),
2559 ntohl (ch->lid_dest.channel_of_client));
2560
2561 return buf;
2562}
diff --git a/src/cadet/gnunet-service-cadet_channel.h b/src/cadet/gnunet-service-cadet_channel.h
deleted file mode 100644
index 9d4893269..000000000
--- a/src/cadet/gnunet-service-cadet_channel.h
+++ /dev/null
@@ -1,363 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_channel.h
23 * @brief cadet service; dealing with end-to-end channels
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMCH (Gnunet Cadet CHannel)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_CHANNEL_H
30#define GNUNET_SERVICE_CADET_CHANNEL_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42
43#include "cadet_protocol.h"
44#include "cadet.h"
45
46/**
47 * Struct containing all information regarding a channel to a remote client.
48 */
49struct CadetChannel;
50
51
52#include "gnunet-service-cadet_tunnel.h"
53#include "gnunet-service-cadet_local.h"
54
55
56/**
57 * Destroy a channel and free all resources.
58 *
59 * @param ch Channel to destroy.
60 */
61void
62GCCH_destroy (struct CadetChannel *ch);
63
64
65/**
66 * Get the channel's public ID.
67 *
68 * @param ch Channel.
69 *
70 * @return ID used to identify the channel with the remote peer.
71 */
72struct GNUNET_CADET_ChannelTunnelNumber
73GCCH_get_id (const struct CadetChannel *ch);
74
75
76/**
77 * Get the channel tunnel.
78 *
79 * @param ch Channel to get the tunnel from.
80 *
81 * @return tunnel of the channel.
82 */
83struct CadetTunnel *
84GCCH_get_tunnel (const struct CadetChannel *ch);
85
86
87/**
88 * Get free buffer space towards the client on a specific channel.
89 *
90 * @param ch Channel.
91 * @param fwd Is query about FWD traffic?
92 *
93 * @return Free buffer space [0 - 64]
94 */
95unsigned int
96GCCH_get_buffer (struct CadetChannel *ch, int fwd);
97
98
99/**
100 * Get flow control status of end point: is client allow to send?
101 *
102 * @param ch Channel.
103 * @param fwd Is query about FWD traffic? (Request root status).
104 *
105 * @return #GNUNET_YES if client is allowed to send us data.
106 */
107int
108GCCH_get_allowed (struct CadetChannel *ch, int fwd);
109
110
111/**
112 * Is the root client for this channel on this peer?
113 *
114 * @param ch Channel.
115 * @param fwd Is this for fwd traffic?
116 *
117 * @return #GNUNET_YES in case it is.
118 */
119int
120GCCH_is_origin (struct CadetChannel *ch, int fwd);
121
122/**
123 * Is the destination client for this channel on this peer?
124 *
125 * @param ch Channel.
126 * @param fwd Is this for fwd traffic?
127 *
128 * @return #GNUNET_YES in case it is.
129 */
130int
131GCCH_is_terminal (struct CadetChannel *ch, int fwd);
132
133/**
134 * Send an end-to-end ACK message for the most recent in-sequence payload.
135 *
136 * If channel is not reliable, do nothing.
137 *
138 * @param ch Channel this is about.
139 * @param fwd Is for FWD traffic? (ACK dest->owner)
140 */
141void
142GCCH_send_data_ack (struct CadetChannel *ch, int fwd);
143
144/**
145 * Notify the destination client that a new incoming channel was created.
146 *
147 * @param ch Channel that was created.
148 */
149void
150GCCH_send_create (struct CadetChannel *ch);
151
152/**
153 * Allow a client to send us more data, in case it was choked.
154 *
155 * @param ch Channel.
156 * @param fwd Is this about FWD traffic? (Root client).
157 */
158void
159GCCH_allow_client (struct CadetChannel *ch, int fwd);
160
161/**
162 * Log channel info.
163 *
164 * @param ch Channel.
165 * @param level Debug level to use.
166 */
167void
168GCCH_debug (struct CadetChannel *ch, enum GNUNET_ErrorType level);
169
170/**
171 * Handle an ACK given by a client.
172 *
173 * Mark client as ready and send him any buffered data we could have for him.
174 *
175 * @param ch Channel.
176 * @param fwd Is this a "FWD ACK"? (FWD ACKs are sent by root and go BCK)
177 */
178void
179GCCH_handle_local_ack (struct CadetChannel *ch, int fwd);
180
181/**
182 * Handle data given by a client.
183 *
184 * Check whether the client is allowed to send in this tunnel, save if channel
185 * is reliable and send an ACK to the client if there is still buffer space
186 * in the tunnel.
187 *
188 * @param ch Channel.
189 * @param c Client which sent the data.
190 * @param fwd Is this a FWD data?
191 * @param message Data message.
192 * @param size Size of data.
193 *
194 * @return GNUNET_OK if everything goes well, GNUNET_SYSERR in case of en error.
195 */
196int
197GCCH_handle_local_data (struct CadetChannel *ch,
198 struct CadetClient *c, int fwd,
199 const struct GNUNET_MessageHeader *message,
200 size_t size);
201
202/**
203 * Handle a channel destroy requested by a client.
204 *
205 * Destroy the channel and the tunnel in case this was the last channel.
206 *
207 * @param ch Channel.
208 * @param c Client that requested the destruction (to avoid notifying him).
209 * @param is_root Is the request coming from root?
210 */
211void
212GCCH_handle_local_destroy (struct CadetChannel *ch,
213 struct CadetClient *c,
214 int is_root);
215
216
217/**
218 * Handle a channel create requested by a client.
219 *
220 * Create the channel and the tunnel in case this was the first0 channel.
221 *
222 * @param c Client that requested the creation (will be the root).
223 * @param msg Create Channel message.
224 *
225 * @return #GNUNET_OK if everything went fine, #GNUNET_SYSERR otherwise.
226 */
227int
228GCCH_handle_local_create (struct CadetClient *c,
229 struct GNUNET_CADET_LocalChannelCreateMessage *msg);
230
231/**
232 * Handler for cadet network payload traffic.
233 *
234 * @param ch Channel for the message.
235 * @param msg Unencryted data message.
236 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
237 * #GNUNET_YES if message is FWD on the respective channel (loopback)
238 * #GNUNET_NO if message is BCK on the respective channel (loopback)
239 * #GNUNET_SYSERR if message on a one-ended channel (remote)
240 */
241void
242GCCH_handle_data (struct CadetChannel *ch,
243 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
244 int fwd);
245
246
247/**
248 * Handler for cadet network traffic end-to-end ACKs.
249 *
250 * @param ch Channel on which we got this message.
251 * @param msg Data message.
252 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
253 * #GNUNET_YES if message is FWD on the respective channel (loopback)
254 * #GNUNET_NO if message is BCK on the respective channel (loopback)
255 * #GNUNET_SYSERR if message on a one-ended channel (remote)
256 */
257void
258GCCH_handle_data_ack (struct CadetChannel *ch,
259 const struct GNUNET_CADET_ChannelDataAckMessage *msg,
260 int fwd);
261
262
263/**
264 * Handler for channel create messages.
265 *
266 * Does not have fwd parameter because it's always 'FWD': channel is incoming.
267 *
268 * @param t Tunnel this channel will be in.
269 * @param msg Channel crate message.
270 */
271struct CadetChannel *
272GCCH_handle_create (struct CadetTunnel *t,
273 const struct GNUNET_CADET_ChannelOpenMessage *msg);
274
275
276/**
277 * Handler for channel NACK messages.
278 *
279 * NACK messages always go dest -> root, no need for 'fwd' or 'msg' parameter.
280 *
281 * @param ch Channel.
282 */
283void
284GCCH_handle_nack (struct CadetChannel *ch);
285
286
287/**
288 * Handler for channel ack messages.
289 *
290 * @param ch Channel this channel is to be created in.
291 * @param msg Message.
292 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
293 * #GNUNET_YES if message is FWD on the respective channel (loopback)
294 * #GNUNET_NO if message is BCK on the respective channel (loopback)
295 * #GNUNET_SYSERR if message on a one-ended channel (remote)
296 */
297void
298GCCH_handle_ack (struct CadetChannel *ch,
299 const struct GNUNET_CADET_ChannelManageMessage *msg,
300 int fwd);
301
302
303/**
304 * Handler for channel destroy messages.
305 *
306 * @param ch Channel this channel is to be destroyed of.
307 * @param msg Message.
308 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
309 * #GNUNET_YES if message is FWD on the respective channel (loopback)
310 * #GNUNET_NO if message is BCK on the respective channel (loopback)
311 * #GNUNET_SYSERR if message on a one-ended channel (remote)
312 */
313void
314GCCH_handle_destroy (struct CadetChannel *ch,
315 const struct GNUNET_CADET_ChannelManageMessage *msg,
316 int fwd);
317
318
319/**
320 * Sends an already built message on a channel.
321 *
322 * If the channel is on a loopback tunnel, notifies the appropriate destination
323 * client locally.
324 *
325 * On a normal channel passes the message to the tunnel for encryption and
326 * sending on a connection.
327 *
328 * This function DOES NOT save the message for retransmission.
329 *
330 * @param message Message to send. Function makes a copy of it.
331 * @param ch Channel on which this message is transmitted.
332 * @param fwd Is this a fwd message?
333 * @param existing_copy This is a retransmission, don't save a copy.
334 */
335void
336GCCH_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
337 struct CadetChannel *ch, int fwd,
338 void *existing_copy);
339
340
341/**
342 * Get the static string for identification of the channel.
343 *
344 * @param ch Channel.i
345 *
346 * @return Static string with the channel IDs.
347 */
348const char *
349GCCH_2s (const struct CadetChannel *ch);
350
351
352
353
354#if 0 /* keep Emacsens' auto-indent happy */
355{
356#endif
357#ifdef __cplusplus
358}
359#endif
360
361/* ifndef GNUNET_SERVICE_CADET_CHANNEL_H */
362#endif
363/* end of gnunet-service-cadet_channel.h */
diff --git a/src/cadet/gnunet-service-cadet_connection.c b/src/cadet/gnunet-service-cadet_connection.c
deleted file mode 100644
index 2d5087f81..000000000
--- a/src/cadet/gnunet-service-cadet_connection.c
+++ /dev/null
@@ -1,3713 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2001-2015 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20/**
21 * @file cadet/gnunet-service-cadet_connection.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
24 */
25#include "platform.h"
26#include "gnunet_util_lib.h"
27#include "gnunet_statistics_service.h"
28#include "cadet_path.h"
29#include "cadet_protocol.h"
30#include "cadet.h"
31#include "gnunet-service-cadet_connection.h"
32#include "gnunet-service-cadet_peer.h"
33#include "gnunet-service-cadet_tunnel.h"
34
35
36/**
37 * Should we run somewhat expensive checks on our invariants?
38 */
39#define CHECK_INVARIANTS 0
40
41
42#define LOG(level, ...) GNUNET_log_from (level,"cadet-con",__VA_ARGS__)
43#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-con",__VA_ARGS__)
44
45
46#define CADET_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
47 GNUNET_TIME_UNIT_MINUTES,\
48 10)
49#define AVG_MSGS 32
50
51
52/******************************************************************************/
53/******************************** STRUCTS **********************************/
54/******************************************************************************/
55
56/**
57 * Handle for messages queued but not yet sent.
58 */
59struct CadetConnectionQueue
60{
61
62 struct CadetConnectionQueue *next;
63 struct CadetConnectionQueue *prev;
64
65 /**
66 * Peer queue handle, to cancel if necessary.
67 */
68 struct CadetPeerQueue *peer_q;
69
70 /**
71 * Continuation to call once sent.
72 */
73 GCC_sent cont;
74
75 /**
76 * Closure for @e cont.
77 */
78 void *cont_cls;
79
80 /**
81 * Was this a forced message? (Do not account for it)
82 */
83 int forced;
84};
85
86
87/**
88 * Struct to encapsulate all the Flow Control information to a peer to which
89 * we are directly connected (on a core level).
90 */
91struct CadetFlowControl
92{
93 /**
94 * Connection this controls.
95 */
96 struct CadetConnection *c;
97
98 struct CadetConnectionQueue *q_head;
99 struct CadetConnectionQueue *q_tail;
100
101 /**
102 * How many messages are in the queue on this connection.
103 */
104 unsigned int queue_n;
105
106 /**
107 * How many messages do we accept in the queue.
108 * If 0, the connection is broken in this direction (next hop disconnected).
109 */
110 unsigned int queue_max;
111
112 /**
113 * ID of the next packet to send.
114 */
115 struct CadetEncryptedMessageIdentifier next_pid;
116
117 /**
118 * ID of the last packet sent towards the peer.
119 */
120 struct CadetEncryptedMessageIdentifier last_pid_sent;
121
122 /**
123 * ID of the last packet received from the peer.
124 */
125 struct CadetEncryptedMessageIdentifier last_pid_recv;
126
127 /**
128 * Bitmap of past 32 messages received:
129 * - LSB being @c last_pid_recv.
130 * - MSB being @c last_pid_recv - 31 (mod UINTMAX).
131 */
132 uint32_t recv_bitmap;
133
134 /**
135 * Last ACK sent to the peer (peer is not allowed to send
136 * messages with PIDs higher than this value).
137 */
138 struct CadetEncryptedMessageIdentifier last_ack_sent;
139
140 /**
141 * Last ACK sent towards the origin (for traffic towards leaf node).
142 */
143 struct CadetEncryptedMessageIdentifier last_ack_recv;
144
145 /**
146 * Task to poll the peer in case of a lost ACK causes stall.
147 */
148 struct GNUNET_SCHEDULER_Task *poll_task;
149
150 /**
151 * How frequently to poll for ACKs.
152 */
153 struct GNUNET_TIME_Relative poll_time;
154
155 /**
156 * Queued poll message, to cancel if not necessary anymore (got ACK).
157 */
158 struct CadetConnectionQueue *poll_msg;
159
160 /**
161 * Queued poll message, to cancel if not necessary anymore (got ACK).
162 */
163 struct CadetConnectionQueue *ack_msg;
164};
165
166/**
167 * Keep a record of the last messages sent on this connection.
168 */
169struct CadetConnectionPerformance
170{
171 /**
172 * Circular buffer for storing measurements.
173 */
174 double usecsperbyte[AVG_MSGS];
175
176 /**
177 * Running average of @c usecsperbyte.
178 */
179 double avg;
180
181 /**
182 * How many values of @c usecsperbyte are valid.
183 */
184 uint16_t size;
185
186 /**
187 * Index of the next "free" position in @c usecsperbyte.
188 */
189 uint16_t idx;
190};
191
192
193/**
194 * Struct containing all information regarding a connection to a peer.
195 */
196struct CadetConnection
197{
198 /**
199 * Tunnel this connection is part of.
200 */
201 struct CadetTunnel *t;
202
203 /**
204 * Flow control information for traffic fwd.
205 */
206 struct CadetFlowControl fwd_fc;
207
208 /**
209 * Flow control information for traffic bck.
210 */
211 struct CadetFlowControl bck_fc;
212
213 /**
214 * Measure connection performance on the endpoint.
215 */
216 struct CadetConnectionPerformance *perf;
217
218 /**
219 * ID of the connection.
220 */
221 struct GNUNET_CADET_ConnectionTunnelIdentifier id;
222
223 /**
224 * Path being used for the tunnel. At the origin of the connection
225 * it's a pointer to the destination's path pool, otherwise just a copy.
226 */
227 struct CadetPeerPath *path;
228
229 /**
230 * Task to keep the used paths alive at the owner,
231 * time tunnel out on all the other peers.
232 */
233 struct GNUNET_SCHEDULER_Task *fwd_maintenance_task;
234
235 /**
236 * Task to keep the used paths alive at the destination,
237 * time tunnel out on all the other peers.
238 */
239 struct GNUNET_SCHEDULER_Task *bck_maintenance_task;
240
241 /**
242 * Queue handle for maintainance traffic. One handle for FWD and BCK since
243 * one peer never needs to maintain both directions (no loopback connections).
244 */
245 struct CadetPeerQueue *maintenance_q;
246
247 /**
248 * Should equal #get_next_hop(), or NULL if that peer disconnected.
249 */
250 struct CadetPeer *next_peer;
251
252 /**
253 * Should equal #get_prev_hop(), or NULL if that peer disconnected.
254 */
255 struct CadetPeer *prev_peer;
256
257 /**
258 * State of the connection.
259 */
260 enum CadetConnectionState state;
261
262 /**
263 * Position of the local peer in the path.
264 */
265 unsigned int own_pos;
266
267 /**
268 * Pending message count.
269 */
270 unsigned int pending_messages;
271
272 /**
273 * Destroy flag:
274 * - if 0, connection in use.
275 * - if 1, destroy on last message.
276 * - if 2, connection is being destroyed don't re-enter.
277 */
278 int destroy;
279
280 /**
281 * In-connection-map flag. Sometimes, when @e destroy is set but
282 * actual destruction is delayed to enable us to finish processing
283 * queues (i.e. in the direction that is still working), we remove
284 * the connection from the map to prevent it from still being
285 * found (and used) by accident. This flag is set to #GNUNET_YES
286 * for a connection that is not in the #connections map. Should
287 * only be #GNUNET_YES if #destroy is also non-zero.
288 */
289 int was_removed;
290
291 /**
292 * Counter to do exponential backoff when creating a connection (max 64).
293 */
294 unsigned short create_retry;
295
296 /**
297 * Task to check if connection has duplicates.
298 */
299 struct GNUNET_SCHEDULER_Task *check_duplicates_task;
300};
301
302
303/******************************************************************************/
304/******************************* GLOBALS ***********************************/
305/******************************************************************************/
306
307/**
308 * Global handle to the statistics service.
309 */
310extern struct GNUNET_STATISTICS_Handle *stats;
311
312/**
313 * Local peer own ID (memory efficient handle).
314 */
315extern GNUNET_PEER_Id myid;
316
317/**
318 * Local peer own ID (full value).
319 */
320extern struct GNUNET_PeerIdentity my_full_id;
321
322/**
323 * Connections known, indexed by cid (CadetConnection).
324 */
325static struct GNUNET_CONTAINER_MultiShortmap *connections;
326
327/**
328 * How many connections are we willing to maintain.
329 * Local connections are always allowed,
330 * even if there are more connections than max.
331 */
332static unsigned long long max_connections;
333
334/**
335 * How many messages *in total* are we willing to queue, divide by number of
336 * connections to get connection queue size.
337 */
338static unsigned long long max_msgs_queue;
339
340/**
341 * How often to send path keepalives. Paths timeout after 4 missed.
342 */
343static struct GNUNET_TIME_Relative refresh_connection_time;
344
345/**
346 * How often to send path create / ACKs.
347 */
348static struct GNUNET_TIME_Relative create_connection_time;
349
350
351/******************************************************************************/
352/******************************** STATIC ***********************************/
353/******************************************************************************/
354
355
356
357#if 0 // avoid compiler warning for unused static function
358static void
359fc_debug (struct CadetFlowControl *fc)
360{
361 LOG (GNUNET_ERROR_TYPE_DEBUG, " IN: %u/%u\n",
362 ntohl (fc->last_pid_recv.pid),
363 ntohl (fc->last_ack_sent.pid));
364 LOG (GNUNET_ERROR_TYPE_DEBUG, " OUT: %u/%u\n",
365 fc->last_pid_sent, fc->last_ack_recv);
366 LOG (GNUNET_ERROR_TYPE_DEBUG, " QUEUE: %u/%u\n",
367 fc->queue_n, fc->queue_max);
368}
369
370static void
371connection_debug (struct CadetConnection *c)
372{
373 if (NULL == c)
374 {
375 LOG (GNUNET_ERROR_TYPE_INFO, "DEBUG NULL CONNECTION\n");
376 return;
377 }
378 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s:%X\n",
379 peer2s (c->t->peer), GCC_2s (c));
380 LOG (GNUNET_ERROR_TYPE_DEBUG, " state: %u, pending msgs: %u\n",
381 c->state, c->pending_messages);
382 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
383 fc_debug (&c->fwd_fc);
384 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
385 fc_debug (&c->bck_fc);
386}
387#endif
388
389
390/**
391 * Schedule next keepalive task, taking in consideration
392 * the connection state and number of retries.
393 *
394 * @param c Connection for which to schedule the next keepalive.
395 * @param fwd Direction for the next keepalive.
396 */
397static void
398schedule_next_keepalive (struct CadetConnection *c, int fwd);
399
400
401/**
402 * Resets the connection timeout task, some other message has done the
403 * task's job.
404 * - For the first peer on the direction this means to send
405 * a keepalive or a path confirmation message (either create or ACK).
406 * - For all other peers, this means to destroy the connection,
407 * due to lack of activity.
408 * Starts the timeout if no timeout was running (connection just created).
409 *
410 * @param c Connection whose timeout to reset.
411 * @param fwd Is this forward?
412 */
413static void
414connection_reset_timeout (struct CadetConnection *c, int fwd);
415
416
417/**
418 * Get string description for tunnel state. Reentrant.
419 *
420 * @param s Tunnel state.
421 *
422 * @return String representation.
423 */
424static const char *
425GCC_state2s (enum CadetConnectionState s)
426{
427 switch (s)
428 {
429 case CADET_CONNECTION_NEW:
430 return "CADET_CONNECTION_NEW";
431 case CADET_CONNECTION_SENT:
432 return "CADET_CONNECTION_SENT";
433 case CADET_CONNECTION_ACK:
434 return "CADET_CONNECTION_ACK";
435 case CADET_CONNECTION_READY:
436 return "CADET_CONNECTION_READY";
437 case CADET_CONNECTION_DESTROYED:
438 return "CADET_CONNECTION_DESTROYED";
439 case CADET_CONNECTION_BROKEN:
440 return "CADET_CONNECTION_BROKEN";
441 default:
442 GNUNET_break (0);
443 LOG (GNUNET_ERROR_TYPE_ERROR, " conn state %u unknown!\n", s);
444 return "CADET_CONNECTION_STATE_ERROR";
445 }
446}
447
448
449/**
450 * Initialize a Flow Control structure to the initial state.
451 *
452 * @param fc Flow Control structure to initialize.
453 */
454static void
455fc_init (struct CadetFlowControl *fc)
456{
457 fc->next_pid.pid = 0;
458 fc->last_pid_sent.pid = htonl (UINT32_MAX);
459 fc->last_pid_recv.pid = htonl (UINT32_MAX);
460 fc->last_ack_sent.pid = (uint32_t) 0;
461 fc->last_ack_recv.pid = (uint32_t) 0;
462 fc->poll_task = NULL;
463 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
464 fc->queue_n = 0;
465 fc->queue_max = (max_msgs_queue / max_connections) + 1;
466}
467
468
469/**
470 * Find a connection.
471 *
472 * @param cid Connection ID.
473 *
474 * @return conntection with the given ID @cid or NULL if not found.
475 */
476static struct CadetConnection *
477connection_get (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid)
478{
479 return GNUNET_CONTAINER_multishortmap_get (connections,
480 &cid->connection_of_tunnel);
481}
482
483
484/**
485 * Change the connection state. Cannot change a connection marked as destroyed.
486 *
487 * @param c Connection to change.
488 * @param state New state to set.
489 */
490static void
491connection_change_state (struct CadetConnection* c,
492 enum CadetConnectionState state)
493{
494 LOG (GNUNET_ERROR_TYPE_DEBUG,
495 "Connection %s state %s -> %s\n",
496 GCC_2s (c), GCC_state2s (c->state), GCC_state2s (state));
497 if (CADET_CONNECTION_DESTROYED <= c->state) /* Destroyed or broken. */
498 {
499 LOG (GNUNET_ERROR_TYPE_DEBUG, "state not changing anymore\n");
500 return;
501 }
502 c->state = state;
503 if (CADET_CONNECTION_READY == state)
504 c->create_retry = 1;
505}
506
507
508/**
509 * Mark a connection as "destroyed", to send all pending traffic and freeing
510 * all associated resources, without accepting new status changes on it.
511 *
512 * @param c Connection to mark as destroyed.
513 */
514static void
515mark_destroyed (struct CadetConnection *c)
516{
517 c->destroy = GNUNET_YES;
518 connection_change_state (c, CADET_CONNECTION_DESTROYED);
519}
520
521
522/**
523 * Function called if a connection has been stalled for a while,
524 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
525 *
526 * @param cls Closure (poll ctx).
527 */
528static void
529send_poll (void *cls);
530
531
532/**
533 * Send an ACK on the connection, informing the predecessor about
534 * the available buffer space. Should not be called in case the peer
535 * is origin (no predecessor) in the @c fwd direction.
536 *
537 * Note that for fwd ack, the FWD mean forward *traffic* (root->dest),
538 * the ACK itself goes "back" (dest->root).
539 *
540 * @param c Connection on which to send the ACK.
541 * @param buffer How much space free to advertise?
542 * @param fwd Is this FWD ACK? (Going dest -> root)
543 * @param force Don't optimize out.
544 */
545static void
546send_ack (struct CadetConnection *c,
547 unsigned int buffer,
548 int fwd,
549 int force)
550{
551 static struct CadetEncryptedMessageIdentifier zero;
552 struct CadetFlowControl *next_fc;
553 struct CadetFlowControl *prev_fc;
554 struct GNUNET_CADET_ConnectionEncryptedAckMessage msg;
555 struct CadetEncryptedMessageIdentifier ack_cemi;
556 int delta;
557
558 GCC_check_connections ();
559 GNUNET_assert (GNUNET_NO == GCC_is_origin (c, fwd));
560
561 next_fc = fwd ? &c->fwd_fc : &c->bck_fc;
562 prev_fc = fwd ? &c->bck_fc : &c->fwd_fc;
563
564 LOG (GNUNET_ERROR_TYPE_DEBUG, "send %s ack on %s\n",
565 GC_f2s (fwd), GCC_2s (c));
566
567 /* Check if we need to transmit the ACK. */
568 delta = ntohl (prev_fc->last_ack_sent.pid) - ntohl (prev_fc->last_pid_recv.pid);
569 if (3 < delta && buffer < delta && GNUNET_NO == force)
570 {
571 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, delta > 3\n");
572 LOG (GNUNET_ERROR_TYPE_DEBUG,
573 " last pid recv: %u, last ack sent: %u\n",
574 ntohl (prev_fc->last_pid_recv.pid),
575 ntohl (prev_fc->last_ack_sent.pid));
576 GCC_check_connections ();
577 return;
578 }
579
580 /* Ok, ACK might be necessary, what PID to ACK? */
581 ack_cemi.pid = htonl (ntohl (prev_fc->last_pid_recv.pid) + buffer);
582 LOG (GNUNET_ERROR_TYPE_DEBUG,
583 " ACK %u, last PID %u, last ACK %u, qmax %u, q %u\n",
584 ntohl (ack_cemi.pid),
585 ntohl (prev_fc->last_pid_recv.pid),
586 ntohl (prev_fc->last_ack_sent.pid),
587 next_fc->queue_max, next_fc->queue_n);
588 if ( (ack_cemi.pid == prev_fc->last_ack_sent.pid) &&
589 (GNUNET_NO == force) )
590 {
591 LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
592 GCC_check_connections ();
593 return;
594 }
595
596 /* Check if message is already in queue */
597 if (NULL != prev_fc->ack_msg)
598 {
599 if (GC_is_pid_bigger (ntohl (ack_cemi.pid),
600 ntohl (prev_fc->last_ack_sent.pid)))
601 {
602 LOG (GNUNET_ERROR_TYPE_DEBUG, " canceling old ACK\n");
603 GCC_cancel (prev_fc->ack_msg);
604 /* GCC_cancel triggers ack_sent(), which clears fc->ack_msg */
605 }
606 else
607 {
608 LOG (GNUNET_ERROR_TYPE_DEBUG, " same ACK already in queue\n");
609 GCC_check_connections ();
610 return;
611 }
612 }
613 GNUNET_break (GC_is_pid_bigger (ntohl (ack_cemi.pid),
614 ntohl (prev_fc->last_ack_sent.pid)));
615 prev_fc->last_ack_sent = ack_cemi;
616
617 /* Build ACK message and send on conn */
618 msg.header.size = htons (sizeof (msg));
619 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK);
620 msg.cemi_max = ack_cemi;
621 msg.cid = c->id;
622
623 prev_fc->ack_msg = GCC_send_prebuilt_message (&msg.header,
624 UINT16_MAX,
625 zero,
626 c,
627 !fwd,
628 GNUNET_YES,
629 NULL, NULL);
630 GNUNET_assert (NULL != prev_fc->ack_msg);
631 GCC_check_connections ();
632}
633
634
635/**
636 * Update performance information if we are a connection's endpoint.
637 *
638 * @param c Connection to update.
639 * @param wait How much time did we wait to send the last message.
640 * @param size Size of the last message.
641 */
642static void
643update_perf (struct CadetConnection *c,
644 struct GNUNET_TIME_Relative wait,
645 uint16_t size)
646{
647 struct CadetConnectionPerformance *p;
648 double usecsperbyte;
649
650 if (NULL == c->perf)
651 return; /* Only endpoints are interested in timing. */
652
653 p = c->perf;
654 usecsperbyte = ((double) wait.rel_value_us) / size;
655 if (p->size == AVG_MSGS)
656 {
657 /* Array is full. Substract oldest value, add new one and store. */
658 p->avg -= (p->usecsperbyte[p->idx] / AVG_MSGS);
659 p->usecsperbyte[p->idx] = usecsperbyte;
660 p->avg += (p->usecsperbyte[p->idx] / AVG_MSGS);
661 }
662 else
663 {
664 /* Array not yet full. Add current value to avg and store. */
665 p->usecsperbyte[p->idx] = usecsperbyte;
666 p->avg *= p->size;
667 p->avg += p->usecsperbyte[p->idx];
668 p->size++;
669 p->avg /= p->size;
670 }
671 p->idx = (p->idx + 1) % AVG_MSGS;
672}
673
674
675/**
676 * Callback called when a connection queued message is sent.
677 *
678 * Calculates the average time and connection packet tracking.
679 *
680 * @param cls Closure (ConnectionQueue Handle), can be NULL.
681 * @param c Connection this message was on.
682 * @param fwd Was this a FWD going message?
683 * @param sent Was it really sent? (Could have been canceled)
684 * @param type Type of message sent.
685 * @param payload_type Type of payload, if applicable.
686 * @param pid Message ID, or 0 if not applicable (create, destroy, etc).
687 * @param size Size of the message.
688 * @param wait Time spent waiting for core (only the time for THIS message)
689 */
690static void
691conn_message_sent (void *cls,
692 struct CadetConnection *c,
693 int fwd,
694 int sent,
695 uint16_t type,
696 uint16_t payload_type,
697 struct CadetEncryptedMessageIdentifier pid,
698 size_t size,
699 struct GNUNET_TIME_Relative wait)
700{
701 struct CadetConnectionQueue *q = cls;
702 struct CadetFlowControl *fc;
703 int forced;
704
705 GCC_check_connections ();
706 LOG (GNUNET_ERROR_TYPE_INFO,
707 ">>> %s (%s %4u) on conn %s (%p) %s [%5u] in queue %s\n",
708 GC_m2s (type), GC_m2s (payload_type),
709 ntohl (pid.pid),
710 GCC_2s (c),
711 c,
712 GC_f2s (fwd), size,
713 GNUNET_STRINGS_relative_time_to_string (wait, GNUNET_YES));
714
715 /* If c is NULL, nothing to update. */
716 if (NULL == c)
717 {
718 if (type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN
719 && type != GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY)
720 {
721 LOG (GNUNET_ERROR_TYPE_ERROR, "Message %s sent on NULL connection!\n",
722 GC_m2s (type));
723 }
724 GCC_check_connections ();
725 return;
726 }
727
728 LOG (GNUNET_ERROR_TYPE_DEBUG, " %ssent %s %s pid %u\n",
729 sent ? "" : "not ", GC_f2s (fwd),
730 GC_m2s (type), GC_m2s (payload_type),
731 ntohl (pid.pid));
732 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
733
734 /* Update flow control info. */
735 fc = fwd ? &c->fwd_fc : &c->bck_fc;
736
737 if (NULL != q)
738 {
739 GNUNET_CONTAINER_DLL_remove (fc->q_head, fc->q_tail, q);
740 forced = q->forced;
741 if (NULL != q->cont)
742 {
743 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cont\n");
744 q->cont (q->cont_cls, c, q, type, fwd, size);
745 }
746 GNUNET_free (q);
747 }
748 else /* CONN_CREATE or CONN_ACK */
749 {
750 GNUNET_assert (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED != type);
751 forced = GNUNET_YES;
752 }
753
754 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P- %p %u\n", c, c->pending_messages);
755 c->pending_messages--;
756 if ( (GNUNET_YES == c->destroy) &&
757 (0 == c->pending_messages) )
758 {
759 LOG (GNUNET_ERROR_TYPE_DEBUG,
760 "! destroying connection!\n");
761 GCC_destroy (c);
762 GCC_check_connections ();
763 return;
764 }
765
766 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
767 switch (type)
768 {
769 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
770 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK:
771 c->maintenance_q = NULL;
772 /* Don't trigger a keepalive for sent ACKs, only SYN and SYNACKs */
773 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE == type || !fwd)
774 schedule_next_keepalive (c, fwd);
775 break;
776
777 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED:
778 if (GNUNET_YES == sent)
779 {
780 fc->last_pid_sent = pid;
781 if (GC_is_pid_bigger (ntohl (fc->last_pid_sent.pid) + 1,
782 ntohl (fc->last_ack_recv.pid)) )
783 GCC_start_poll (c, fwd);
784 GCC_send_ack (c, fwd, GNUNET_NO);
785 connection_reset_timeout (c, fwd);
786 }
787
788 LOG (GNUNET_ERROR_TYPE_DEBUG, "! Q_N- %p %u\n", fc, fc->queue_n);
789 if (GNUNET_NO == forced)
790 {
791 fc->queue_n--;
792 LOG (GNUNET_ERROR_TYPE_DEBUG,
793 "! accounting pid %u\n",
794 ntohl (fc->last_pid_sent.pid));
795 }
796 else
797 {
798 LOG (GNUNET_ERROR_TYPE_DEBUG,
799 "! forced, Q_N not accounting pid %u\n",
800 ntohl (fc->last_pid_sent.pid));
801 }
802 break;
803
804 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_KX:
805 if (GNUNET_YES == sent)
806 connection_reset_timeout (c, fwd);
807 break;
808
809 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL:
810 fc->poll_msg = NULL;
811 if (2 == c->destroy)
812 {
813 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL canceled on shutdown\n");
814 return;
815 }
816 if (0 == fc->queue_max)
817 {
818 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL cancelled: neighbor disconnected\n");
819 return;
820 }
821 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL sent for %s, scheduling new one!\n",
822 GCC_2s (c));
823 GNUNET_assert (NULL == fc->poll_task);
824 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
825 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
826 &send_poll, fc);
827 LOG (GNUNET_ERROR_TYPE_DEBUG, " task %u\n", fc->poll_task);
828 break;
829
830 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK:
831 fc->ack_msg = NULL;
832 break;
833
834 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
835 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
836 break;
837
838 default:
839 LOG (GNUNET_ERROR_TYPE_ERROR, "%s unknown\n", GC_m2s (type));
840 GNUNET_break (0);
841 break;
842 }
843 LOG (GNUNET_ERROR_TYPE_DEBUG, "! message sent!\n");
844
845 update_perf (c, wait, size);
846 GCC_check_connections ();
847}
848
849
850/**
851 * Get the previous hop in a connection
852 *
853 * @param c Connection.
854 *
855 * @return Previous peer in the connection.
856 */
857static struct CadetPeer *
858get_prev_hop (const struct CadetConnection *c)
859{
860 GNUNET_PEER_Id id;
861
862 if (NULL == c->path)
863 return NULL;
864 LOG (GNUNET_ERROR_TYPE_DEBUG,
865 " get prev hop %s [%u/%u]\n",
866 GCC_2s (c), c->own_pos, c->path->length);
867 if (0 == c->own_pos || c->path->length < 2)
868 id = c->path->peers[0];
869 else
870 id = c->path->peers[c->own_pos - 1];
871
872 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
873 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
874
875 return GCP_get_short (id, GNUNET_YES);
876}
877
878
879/**
880 * Get the next hop in a connection
881 *
882 * @param c Connection.
883 *
884 * @return Next peer in the connection.
885 */
886static struct CadetPeer *
887get_next_hop (const struct CadetConnection *c)
888{
889 GNUNET_PEER_Id id;
890
891 if (NULL == c->path)
892 return NULL;
893
894 LOG (GNUNET_ERROR_TYPE_DEBUG, " get next hop %s [%u/%u]\n",
895 GCC_2s (c), c->own_pos, c->path->length);
896 if ((c->path->length - 1) == c->own_pos || c->path->length < 2)
897 id = c->path->peers[c->path->length - 1];
898 else
899 id = c->path->peers[c->own_pos + 1];
900
901 LOG (GNUNET_ERROR_TYPE_DEBUG, " ID: %s (%u)\n",
902 GNUNET_i2s (GNUNET_PEER_resolve2 (id)), id);
903
904 return GCP_get_short (id, GNUNET_YES);
905}
906
907
908/**
909 * Check that the direct neighbours (previous and next hop)
910 * are properly associated with this connection.
911 *
912 * @param c connection to check
913 */
914static void
915check_neighbours (const struct CadetConnection *c)
916{
917 if (NULL == c->path)
918 return; /* nothing to check */
919 GCP_check_connection (get_next_hop (c), c);
920 GCP_check_connection (get_prev_hop (c), c);
921}
922
923
924/**
925 * Helper for #GCC_check_connections(). Calls #check_neighbours().
926 *
927 * @param cls NULL
928 * @param key ignored
929 * @param value the `struct CadetConnection` to check
930 * @return #GNUNET_OK (continue to iterate)
931 */
932static int
933check_connection (void *cls,
934 const struct GNUNET_ShortHashCode *key,
935 void *value)
936{
937 struct CadetConnection *c = value;
938
939 check_neighbours (c);
940 return GNUNET_OK;
941}
942
943
944/**
945 * Check invariants for all connections using #check_neighbours().
946 */
947void
948GCC_check_connections ()
949{
950 if (0 == CHECK_INVARIANTS)
951 return;
952 if (NULL == connections)
953 return;
954 GNUNET_CONTAINER_multishortmap_iterate (connections,
955 &check_connection,
956 NULL);
957}
958
959
960/**
961 * Get the hop in a connection.
962 *
963 * @param c Connection.
964 * @param fwd Next in the FWD direction?
965 *
966 * @return Next peer in the connection.
967 */
968static struct CadetPeer *
969get_hop (struct CadetConnection *c, int fwd)
970{
971 return (fwd) ? get_next_hop (c) : get_prev_hop (c);
972}
973
974
975/**
976 * Get a bit mask for a message received out-of-order.
977 *
978 * @param last_pid_recv Last PID we received prior to the out-of-order.
979 * @param ooo_pid PID of the out-of-order message.
980 */
981static uint32_t
982get_recv_bitmask (struct CadetEncryptedMessageIdentifier last_pid_recv,
983 struct CadetEncryptedMessageIdentifier ooo_pid)
984{
985 // FIXME: should assert that the delta is in range...
986 return 1 << (ntohl (last_pid_recv.pid) - ntohl (ooo_pid.pid));
987}
988
989
990/**
991 * Check is an out-of-order message is ok:
992 * - at most 31 messages behind.
993 * - not duplicate.
994 *
995 * @param last_pid_recv Last in-order PID received.
996 */
997static int
998is_ooo_ok (struct CadetEncryptedMessageIdentifier last_pid_recv,
999 struct CadetEncryptedMessageIdentifier ooo_pid,
1000 uint32_t ooo_bitmap)
1001{
1002 uint32_t mask;
1003
1004 if (GC_is_pid_bigger (ntohl (last_pid_recv.pid) - 31,
1005 ntohl (ooo_pid.pid)))
1006 return GNUNET_NO;
1007
1008 mask = get_recv_bitmask (last_pid_recv,
1009 ooo_pid);
1010 if (0 != (ooo_bitmap & mask))
1011 return GNUNET_NO;
1012
1013 return GNUNET_YES;
1014}
1015
1016
1017/**
1018 * Is traffic coming from this sender 'FWD' traffic?
1019 *
1020 * @param c Connection to check.
1021 * @param sender Short peer identity of neighbor.
1022 *
1023 * @return #GNUNET_YES in case the sender is the 'prev' hop and therefore
1024 * the traffic is 'FWD'.
1025 * #GNUNET_NO for BCK.
1026 * #GNUNET_SYSERR for errors (sender isn't a hop in the connection).
1027 */
1028static int
1029is_fwd (const struct CadetConnection *c,
1030 const struct CadetPeer *sender)
1031{
1032 GNUNET_PEER_Id id;
1033
1034 id = GCP_get_short_id (sender);
1035 if (GCP_get_short_id (get_prev_hop (c)) == id)
1036 return GNUNET_YES;
1037
1038 if (GCP_get_short_id (get_next_hop (c)) == id)
1039 return GNUNET_NO;
1040
1041 return GNUNET_SYSERR;
1042}
1043
1044
1045/**
1046 * Sends a CONNECTION ACK message in reponse to a received CONNECTION_CREATE
1047 * or a first CONNECTION_ACK directed to us.
1048 *
1049 * @param c Connection to confirm.
1050 * @param fwd Should we send it FWD? (root->dest)
1051 * (First (~SYNACK) goes BCK, second (~ACK) goes FWD)
1052 */
1053static void
1054send_connection_ack (struct CadetConnection *c, int fwd)
1055{
1056 static struct CadetEncryptedMessageIdentifier zero;
1057 struct GNUNET_CADET_ConnectionCreateAckMessage msg;
1058 struct CadetTunnel *t;
1059 const uint16_t size = sizeof (struct GNUNET_CADET_ConnectionCreateAckMessage);
1060 const uint16_t type = GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK;
1061
1062 GCC_check_connections ();
1063 t = c->t;
1064 LOG (GNUNET_ERROR_TYPE_INFO,
1065 "==> %s ({ C %s ACK} 0) on conn %s (%p) %s [%5u]\n",
1066 GC_m2s (type), GC_f2s (!fwd), GCC_2s (c), c, GC_f2s (fwd), size);
1067
1068 msg.header.size = htons (size);
1069 msg.header.type = htons (type);
1070 msg.reserved = htonl (0);
1071 msg.cid = c->id;
1072
1073 GNUNET_assert (NULL == c->maintenance_q);
1074 c->maintenance_q = GCP_send (get_hop (c, fwd),
1075 &msg.header,
1076 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK,
1077 zero,
1078 c,
1079 fwd,
1080 &conn_message_sent, NULL);
1081 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (conn`ACK)\n",
1082 c, c->pending_messages);
1083 c->pending_messages++;
1084
1085 if (CADET_TUNNEL_NEW == GCT_get_cstate (t))
1086 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
1087 if (CADET_CONNECTION_READY != c->state)
1088 connection_change_state (c, CADET_CONNECTION_SENT);
1089 GCC_check_connections ();
1090}
1091
1092
1093/**
1094 * Send a notification that a connection is broken.
1095 *
1096 * @param c Connection that is broken.
1097 * @param id1 Peer that has disconnected.
1098 * @param id2 Peer that has disconnected.
1099 * @param fwd Direction towards which to send it.
1100 */
1101static void
1102send_broken (struct CadetConnection *c,
1103 const struct GNUNET_PeerIdentity *id1,
1104 const struct GNUNET_PeerIdentity *id2,
1105 int fwd)
1106{
1107 static struct CadetEncryptedMessageIdentifier zero;
1108 struct GNUNET_CADET_ConnectionBrokenMessage msg;
1109
1110 GCC_check_connections ();
1111 msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBrokenMessage));
1112 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
1113 msg.cid = c->id;
1114 msg.reserved = htonl (0);
1115 msg.peer1 = *id1;
1116 msg.peer2 = *id2;
1117 (void) GCC_send_prebuilt_message (&msg.header,
1118 UINT16_MAX,
1119 zero,
1120 c,
1121 fwd,
1122 GNUNET_YES,
1123 NULL, NULL);
1124 GCC_check_connections ();
1125}
1126
1127
1128/**
1129 * Send a notification that a connection is broken, when a connection
1130 * isn't even known to the local peer or soon to be destroyed.
1131 *
1132 * @param connection_id Connection ID.
1133 * @param id1 Peer that has disconnected, probably local peer.
1134 * @param id2 Peer that has disconnected can be NULL if unknown.
1135 * @param neighbor Peer to notify (neighbor who sent the connection).
1136 */
1137static void
1138send_broken_unknown (const struct GNUNET_CADET_ConnectionTunnelIdentifier *connection_id,
1139 const struct GNUNET_PeerIdentity *id1,
1140 const struct GNUNET_PeerIdentity *id2,
1141 struct CadetPeer *neighbor)
1142{
1143 static struct CadetEncryptedMessageIdentifier zero;
1144 struct GNUNET_CADET_ConnectionBrokenMessage msg;
1145
1146 GCC_check_connections ();
1147 LOG (GNUNET_ERROR_TYPE_INFO, "--> BROKEN on unknown connection %s\n",
1148 GNUNET_sh2s (&connection_id->connection_of_tunnel));
1149
1150 msg.header.size = htons (sizeof (struct GNUNET_CADET_ConnectionBrokenMessage));
1151 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN);
1152 msg.cid = *connection_id;
1153 msg.reserved = htonl (0);
1154 msg.peer1 = *id1;
1155 if (NULL != id2)
1156 msg.peer2 = *id2;
1157 else
1158 memset (&msg.peer2, 0, sizeof (msg.peer2));
1159 GNUNET_assert (NULL != GCP_send (neighbor,
1160 &msg.header,
1161 UINT16_MAX,
1162 zero,
1163 NULL,
1164 GNUNET_SYSERR, /* connection, fwd */
1165 NULL, NULL)); /* continuation */
1166 GCC_check_connections ();
1167}
1168
1169
1170/**
1171 * Send keepalive packets for a connection.
1172 *
1173 * @param c Connection to keep alive..
1174 * @param fwd Is this a FWD keepalive? (owner -> dest).
1175 */
1176static void
1177send_connection_keepalive (struct CadetConnection *c, int fwd)
1178{
1179 struct GNUNET_MessageHeader msg;
1180 struct CadetFlowControl *fc;
1181 int tunnel_ready;
1182
1183 GCC_check_connections ();
1184 LOG (GNUNET_ERROR_TYPE_INFO,
1185 "keepalive %s for connection %s\n",
1186 GC_f2s (fwd), GCC_2s (c));
1187
1188 GNUNET_assert (NULL != c->t);
1189 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1190 tunnel_ready = GNUNET_YES == GCT_has_queued_traffic (c->t)
1191 && CADET_TUNNEL_KEY_OK <= GCT_get_estate (c->t);
1192 if (0 < fc->queue_n || tunnel_ready)
1193 {
1194 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, traffic in queue\n");
1195 return;
1196 }
1197
1198 GNUNET_STATISTICS_update (stats, "# keepalives sent", 1, GNUNET_NO);
1199
1200 GNUNET_assert (NULL != c->t);
1201 msg.size = htons (sizeof (msg));
1202 msg.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE);
1203
1204 GNUNET_assert (NULL ==
1205 GCT_send_prebuilt_message (&msg, c->t, c,
1206 GNUNET_NO, NULL, NULL));
1207 GCC_check_connections ();
1208}
1209
1210
1211/**
1212 * Send CONNECTION_{CREATE/ACK} packets for a connection.
1213 *
1214 * @param c Connection for which to send the message.
1215 * @param fwd If #GNUNET_YES, send CREATE, otherwise send ACK.
1216 */
1217static void
1218connection_recreate (struct CadetConnection *c, int fwd)
1219{
1220 LOG (GNUNET_ERROR_TYPE_DEBUG,
1221 "sending connection recreate\n");
1222 if (fwd)
1223 GCC_send_create (c);
1224 else
1225 send_connection_ack (c, GNUNET_NO);
1226}
1227
1228
1229/**
1230 * Generic connection timer management.
1231 * Depending on the role of the peer in the connection will send the
1232 * appropriate message (build or keepalive)
1233 *
1234 * @param c Conncetion to maintain.
1235 * @param fwd Is FWD?
1236 */
1237static void
1238connection_maintain (struct CadetConnection *c, int fwd)
1239{
1240 if (GNUNET_NO != c->destroy)
1241 {
1242 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, being destroyed\n");
1243 return;
1244 }
1245
1246 if (NULL == c->t)
1247 {
1248 GNUNET_break (0);
1249 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
1250 return;
1251 }
1252
1253 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (c->t))
1254 {
1255 /* If status is SEARCHING, why is there a connection? Should be WAITING */
1256 GNUNET_break (0);
1257 GCT_debug (c->t, GNUNET_ERROR_TYPE_ERROR);
1258 LOG (GNUNET_ERROR_TYPE_INFO, "not sending keepalive, tunnel SEARCHING\n");
1259 schedule_next_keepalive (c, fwd);
1260 return;
1261 }
1262 switch (c->state)
1263 {
1264 case CADET_CONNECTION_NEW:
1265 GNUNET_break (0);
1266 /* fall-through */
1267 case CADET_CONNECTION_SENT:
1268 connection_recreate (c, fwd);
1269 break;
1270 case CADET_CONNECTION_READY:
1271 send_connection_keepalive (c, fwd);
1272 break;
1273 default:
1274 break;
1275 }
1276}
1277
1278
1279/**
1280 * Keep the connection alive.
1281 *
1282 * @param c Connection to keep alive.
1283 * @param fwd Direction.
1284 */
1285static void
1286connection_keepalive (struct CadetConnection *c,
1287 int fwd)
1288{
1289 GCC_check_connections ();
1290 LOG (GNUNET_ERROR_TYPE_DEBUG,
1291 "%s keepalive for %s\n",
1292 GC_f2s (fwd), GCC_2s (c));
1293
1294 if (fwd)
1295 c->fwd_maintenance_task = NULL;
1296 else
1297 c->bck_maintenance_task = NULL;
1298 connection_maintain (c, fwd);
1299 GCC_check_connections ();
1300 /* Next execution will be scheduled by message_sent or _maintain*/
1301}
1302
1303
1304/**
1305 * Keep the connection alive in the FWD direction.
1306 *
1307 * @param cls Closure (connection to keepalive).
1308 */
1309static void
1310connection_fwd_keepalive (void *cls)
1311{
1312 struct CadetConnection *c = cls;
1313
1314 GCC_check_connections ();
1315 connection_keepalive (c,
1316 GNUNET_YES);
1317 GCC_check_connections ();
1318}
1319
1320
1321/**
1322 * Keep the connection alive in the BCK direction.
1323 *
1324 * @param cls Closure (connection to keepalive).
1325 */
1326static void
1327connection_bck_keepalive (void *cls)
1328{
1329 struct CadetConnection *c = cls;
1330
1331 GCC_check_connections ();
1332 connection_keepalive (c,
1333 GNUNET_NO);
1334 GCC_check_connections ();
1335}
1336
1337
1338/**
1339 * Schedule next keepalive task, taking in consideration
1340 * the connection state and number of retries.
1341 *
1342 * If the peer is not the origin, do nothing.
1343 *
1344 * @param c Connection for which to schedule the next keepalive.
1345 * @param fwd Direction for the next keepalive.
1346 */
1347static void
1348schedule_next_keepalive (struct CadetConnection *c, int fwd)
1349{
1350 struct GNUNET_TIME_Relative delay;
1351 struct GNUNET_SCHEDULER_Task * *task_id;
1352 GNUNET_SCHEDULER_TaskCallback keepalive_task;
1353
1354 GCC_check_connections ();
1355 if (GNUNET_NO == GCC_is_origin (c, fwd))
1356 return;
1357
1358 /* Calculate delay to use, depending on the state of the connection */
1359 if (CADET_CONNECTION_READY == c->state)
1360 {
1361 delay = refresh_connection_time;
1362 }
1363 else
1364 {
1365 if (1 > c->create_retry)
1366 c->create_retry = 1;
1367 delay = GNUNET_TIME_relative_saturating_multiply (create_connection_time,
1368 c->create_retry);
1369 if (c->create_retry < 64) // TODO make configurable
1370 c->create_retry *= 2;
1371 }
1372
1373 /* Select direction-dependent parameters */
1374 if (GNUNET_YES == fwd)
1375 {
1376 task_id = &c->fwd_maintenance_task;
1377 keepalive_task = &connection_fwd_keepalive;
1378 }
1379 else
1380 {
1381 task_id = &c->bck_maintenance_task;
1382 keepalive_task = &connection_bck_keepalive;
1383 }
1384
1385 /* Check that no one scheduled it before us */
1386 if (NULL != *task_id)
1387 {
1388 /* No need for a _break. It can happen for instance when sending a SYNACK
1389 * for a duplicate SYN: the first SYNACK scheduled the task. */
1390 GNUNET_SCHEDULER_cancel (*task_id);
1391 }
1392
1393 /* Schedule the task */
1394 *task_id = GNUNET_SCHEDULER_add_delayed (delay,
1395 keepalive_task,
1396 c);
1397 LOG (GNUNET_ERROR_TYPE_INFO,
1398 "next keepalive for %s in in %s\n",
1399 GCC_2s (c), GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1400 GCC_check_connections ();
1401}
1402
1403
1404/**
1405 * Cancel all transmissions that belong to a certain connection.
1406 *
1407 * If the connection is scheduled for destruction and no more messages are left,
1408 * the connection will be destroyed by the continuation call.
1409 *
1410 * @param c Connection which to cancel. Might be destroyed during this call.
1411 * @param fwd Cancel fwd traffic?
1412 */
1413static void
1414connection_cancel_queues (struct CadetConnection *c,
1415 int fwd)
1416{
1417 struct CadetFlowControl *fc;
1418
1419 GCC_check_connections ();
1420 LOG (GNUNET_ERROR_TYPE_DEBUG,
1421 "Cancel %s queues for connection %s\n",
1422 GC_f2s (fwd), GCC_2s (c));
1423 if (NULL == c)
1424 {
1425 GNUNET_break (0);
1426 return;
1427 }
1428
1429 fc = fwd ? &c->fwd_fc : &c->bck_fc;
1430 if (NULL != fc->poll_task)
1431 {
1432 GNUNET_SCHEDULER_cancel (fc->poll_task);
1433 fc->poll_task = NULL;
1434 LOG (GNUNET_ERROR_TYPE_DEBUG, " cancelled POLL task for fc %p\n", fc);
1435 }
1436 if (NULL != fc->poll_msg)
1437 {
1438 GCC_cancel (fc->poll_msg);
1439 LOG (GNUNET_ERROR_TYPE_DEBUG, " cancelled POLL msg for fc %p\n", fc);
1440 }
1441
1442 while (NULL != fc->q_head)
1443 {
1444 GCC_cancel (fc->q_head);
1445 }
1446 GCC_check_connections ();
1447}
1448
1449
1450/**
1451 * Function called if a connection has been stalled for a while,
1452 * possibly due to a missed ACK. Poll the neighbor about its ACK status.
1453 *
1454 * @param cls Closure (poll ctx).
1455 */
1456static void
1457send_poll (void *cls)
1458{
1459 static struct CadetEncryptedMessageIdentifier zero;
1460 struct CadetFlowControl *fc = cls;
1461 struct GNUNET_CADET_ConnectionHopByHopPollMessage msg;
1462 struct CadetConnection *c;
1463 int fwd;
1464
1465 fc->poll_task = NULL;
1466 GCC_check_connections ();
1467 c = fc->c;
1468 fwd = fc == &c->fwd_fc;
1469 LOG (GNUNET_ERROR_TYPE_DEBUG, "Polling connection %s %s\n",
1470 GCC_2s (c), GC_f2s (fwd));
1471
1472 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL);
1473 msg.header.size = htons (sizeof (msg));
1474 msg.cid = c->id;
1475 msg.cemi = fc->last_pid_sent;
1476 LOG (GNUNET_ERROR_TYPE_DEBUG, " last pid sent: %u\n", ntohl (fc->last_pid_sent.pid));
1477 fc->poll_msg
1478 = GCC_send_prebuilt_message (&msg.header,
1479 UINT16_MAX,
1480 zero,
1481 c,
1482 fc == &c->fwd_fc,
1483 GNUNET_YES,
1484 NULL,
1485 NULL);
1486 GNUNET_assert (NULL != fc->poll_msg);
1487 GCC_check_connections ();
1488}
1489
1490
1491/**
1492 * Generic connection timeout implementation.
1493 *
1494 * Timeout function due to lack of keepalive/traffic from an endpoint.
1495 * Destroys connection if called.
1496 *
1497 * @param c Connection to destroy.
1498 * @param fwd Was the timeout from the origin? (FWD timeout)
1499 */
1500static void
1501connection_timeout (struct CadetConnection *c, int fwd)
1502{
1503 GCC_check_connections ();
1504
1505 LOG (GNUNET_ERROR_TYPE_INFO,
1506 "Connection %s %s timed out. Destroying.\n",
1507 GCC_2s (c),
1508 GC_f2s (fwd));
1509 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1510
1511 if (GCC_is_origin (c, fwd)) /* Loopback? Something is wrong! */
1512 {
1513 GNUNET_break (0);
1514 return;
1515 }
1516
1517 /* If dest, send "broken" notification. */
1518 if (GCC_is_terminal (c, fwd))
1519 {
1520 struct CadetPeer *next_hop;
1521
1522 next_hop = fwd ? get_prev_hop (c) : get_next_hop (c);
1523 send_broken_unknown (&c->id, &my_full_id, NULL, next_hop);
1524 }
1525
1526 GCC_destroy (c);
1527 GCC_check_connections ();
1528}
1529
1530
1531/**
1532 * Timeout function due to lack of keepalive/traffic from the owner.
1533 * Destroys connection if called.
1534 *
1535 * @param cls Closure (connection to destroy).
1536 */
1537static void
1538connection_fwd_timeout (void *cls)
1539{
1540 struct CadetConnection *c = cls;
1541
1542 c->fwd_maintenance_task = NULL;
1543 GCC_check_connections ();
1544 connection_timeout (c, GNUNET_YES);
1545 GCC_check_connections ();
1546}
1547
1548
1549/**
1550 * Timeout function due to lack of keepalive/traffic from the destination.
1551 * Destroys connection if called.
1552 *
1553 * @param cls Closure (connection to destroy).
1554 */
1555static void
1556connection_bck_timeout (void *cls)
1557{
1558 struct CadetConnection *c = cls;
1559
1560 c->bck_maintenance_task = NULL;
1561 GCC_check_connections ();
1562 connection_timeout (c, GNUNET_NO);
1563 GCC_check_connections ();
1564}
1565
1566
1567/**
1568 * Resets the connection timeout task, some other message has done the
1569 * task's job.
1570 * - For the first peer on the direction this means to send
1571 * a keepalive or a path confirmation message (either create or ACK).
1572 * - For all other peers, this means to destroy the connection,
1573 * due to lack of activity.
1574 * Starts the timeout if no timeout was running (connection just created).
1575 *
1576 * @param c Connection whose timeout to reset.
1577 * @param fwd Is this forward?
1578 *
1579 * TODO use heap to improve efficiency of scheduler.
1580 */
1581static void
1582connection_reset_timeout (struct CadetConnection *c, int fwd)
1583{
1584 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection %s reset timeout\n", GC_f2s (fwd));
1585 if (GCC_is_origin (c, fwd)) /* Startpoint */
1586 {
1587 schedule_next_keepalive (c, fwd);
1588 if (NULL != c->maintenance_q)
1589 {
1590 GCP_send_cancel (c->maintenance_q);
1591 c->maintenance_q = NULL; /* Is set to NULL by conn_message_sent anyway */
1592 }
1593 }
1594 else /* Relay, endpoint. */
1595 {
1596 struct GNUNET_TIME_Relative delay;
1597 struct GNUNET_SCHEDULER_Task * *ti;
1598 GNUNET_SCHEDULER_TaskCallback f;
1599
1600 ti = fwd ? &c->fwd_maintenance_task : &c->bck_maintenance_task;
1601
1602 if (NULL != *ti)
1603 GNUNET_SCHEDULER_cancel (*ti);
1604 delay = GNUNET_TIME_relative_saturating_multiply (refresh_connection_time, 4);
1605 LOG (GNUNET_ERROR_TYPE_DEBUG,
1606 " timing out in %s\n",
1607 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_NO));
1608 f = fwd ? &connection_fwd_timeout : &connection_bck_timeout;
1609 *ti = GNUNET_SCHEDULER_add_delayed (delay, f, c);
1610 }
1611}
1612
1613
1614/**
1615 * Iterator to compare each connection's path with the path of a new connection.
1616 *
1617 * If the connection coincides, the c member of path is set to the connection
1618 * and the destroy flag of the connection is set.
1619 *
1620 * @param cls Closure (new path).
1621 * @param c Connection in the tunnel to check.
1622 */
1623static void
1624check_path (void *cls, struct CadetConnection *c)
1625{
1626 struct CadetConnection *new_conn = cls;
1627 struct CadetPeerPath *path = new_conn->path;
1628
1629 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking %s (%p), length %u\n",
1630 GCC_2s (c), c, c->path->length);
1631
1632 if (c != new_conn
1633 && GNUNET_NO == c->destroy
1634 && CADET_CONNECTION_BROKEN != c->state
1635 && CADET_CONNECTION_DESTROYED != c->state
1636 && path_equivalent (path, c->path))
1637 {
1638 new_conn->destroy = GNUNET_YES; /* Do not mark_destroyed, */
1639 new_conn->path->c = c; /* this is only a flag for the Iterator. */
1640 LOG (GNUNET_ERROR_TYPE_DEBUG, " MATCH!\n");
1641 }
1642}
1643
1644
1645/**
1646 * Finds out if this path is already being used by an existing connection.
1647 *
1648 * Checks the tunnel towards the destination to see if it contains
1649 * any connection with the same path.
1650 *
1651 * If the existing connection is ready, it is kept.
1652 * Otherwise if the sender has a smaller ID that ours, we accept it (and
1653 * the peer will eventually reject our attempt).
1654 *
1655 * @param path Path to check.
1656 * @return #GNUNET_YES if the tunnel has a connection with the same path,
1657 * #GNUNET_NO otherwise.
1658 */
1659static int
1660does_connection_exist (struct CadetConnection *conn)
1661{
1662 struct CadetPeer *p;
1663 struct CadetTunnel *t;
1664 struct CadetConnection *c;
1665
1666 p = GCP_get_short (conn->path->peers[0], GNUNET_NO);
1667 if (NULL == p)
1668 return GNUNET_NO;
1669 t = GCP_get_tunnel (p);
1670 if (NULL == t)
1671 return GNUNET_NO;
1672
1673 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking for duplicates\n");
1674
1675 GCT_iterate_connections (t, &check_path, conn);
1676
1677 if (GNUNET_YES == conn->destroy)
1678 {
1679 c = conn->path->c;
1680 conn->destroy = GNUNET_NO;
1681 conn->path->c = conn;
1682 LOG (GNUNET_ERROR_TYPE_DEBUG, " found duplicate of %s\n", GCC_2s (conn));
1683 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate: %s\n", GCC_2s (c));
1684 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
1685 if (CADET_CONNECTION_READY == c->state)
1686 {
1687 /* The other peer confirmed a live connection with this path,
1688 * why are they trying to duplicate it? */
1689 GNUNET_STATISTICS_update (stats, "# duplicate connections", 1, GNUNET_NO);
1690 return GNUNET_YES;
1691 }
1692 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate not ready, connection unique\n");
1693 return GNUNET_NO;
1694 }
1695 else
1696 {
1697 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s has no duplicates\n", GCC_2s (conn));
1698 return GNUNET_NO;
1699 }
1700}
1701
1702
1703/**
1704 * @brief Check if the tunnel this connection belongs to has any other
1705 * connection with the same path, and destroy one if so.
1706 *
1707 * @param cls Closure (connection to check).
1708 */
1709static void
1710check_duplicates (void *cls)
1711{
1712 struct CadetConnection *c = cls;
1713
1714 c->check_duplicates_task = NULL;
1715 if (GNUNET_YES == does_connection_exist (c))
1716 {
1717 GCT_debug (c->t, GNUNET_ERROR_TYPE_DEBUG);
1718 send_broken (c, &my_full_id, &my_full_id, GCC_is_origin (c, GNUNET_YES));
1719 GCC_destroy (c);
1720 }
1721}
1722
1723
1724/**
1725 * Wait for enough time to let any dead connections time out and check for
1726 * any remaining duplicates.
1727 *
1728 * @param c Connection that is a potential duplicate.
1729 */
1730static void
1731schedule_check_duplicates (struct CadetConnection *c)
1732{
1733 struct GNUNET_TIME_Relative delay;
1734
1735 if (NULL != c->check_duplicates_task)
1736 return;
1737 delay = GNUNET_TIME_relative_saturating_multiply (refresh_connection_time, 5);
1738 c->check_duplicates_task = GNUNET_SCHEDULER_add_delayed (delay,
1739 &check_duplicates,
1740 c);
1741}
1742
1743
1744/**
1745 * Add the connection to the list of both neighbors.
1746 *
1747 * @param c Connection.
1748 *
1749 * @return #GNUNET_OK if everything went fine
1750 * #GNUNET_SYSERR if the was an error and @c c is malformed.
1751 */
1752static int
1753register_neighbors (struct CadetConnection *c)
1754{
1755 c->next_peer = get_next_hop (c);
1756 c->prev_peer = get_prev_hop (c);
1757 GNUNET_assert (c->next_peer != c->prev_peer);
1758 LOG (GNUNET_ERROR_TYPE_DEBUG,
1759 "register neighbors for connection %s\n",
1760 GCC_2s (c));
1761 path_debug (c->path);
1762 LOG (GNUNET_ERROR_TYPE_DEBUG,
1763 "own pos %u\n", c->own_pos);
1764 LOG (GNUNET_ERROR_TYPE_DEBUG,
1765 "putting connection %s to next peer %p\n",
1766 GCC_2s (c),
1767 c->next_peer);
1768 LOG (GNUNET_ERROR_TYPE_DEBUG, "next peer %p %s\n",
1769 c->next_peer,
1770 GCP_2s (c->next_peer));
1771 LOG (GNUNET_ERROR_TYPE_DEBUG,
1772 "putting connection %s to prev peer %p\n",
1773 GCC_2s (c),
1774 c->prev_peer);
1775 LOG (GNUNET_ERROR_TYPE_DEBUG,
1776 "prev peer %p %s\n",
1777 c->prev_peer,
1778 GCP_2s (c->prev_peer));
1779
1780 if ( (GNUNET_NO == GCP_is_neighbor (c->next_peer)) ||
1781 (GNUNET_NO == GCP_is_neighbor (c->prev_peer)) )
1782 {
1783 if (GCC_is_origin (c, GNUNET_YES))
1784 GNUNET_STATISTICS_update (stats, "# local bad paths", 1, GNUNET_NO);
1785 GNUNET_STATISTICS_update (stats, "# bad paths", 1, GNUNET_NO);
1786
1787 LOG (GNUNET_ERROR_TYPE_DEBUG,
1788 " register neighbors failed\n");
1789 LOG (GNUNET_ERROR_TYPE_DEBUG,
1790 " prev: %s, neighbor?: %d\n",
1791 GCP_2s (c->prev_peer),
1792 GCP_is_neighbor (c->prev_peer));
1793 LOG (GNUNET_ERROR_TYPE_DEBUG,
1794 " next: %s, neighbor?: %d\n",
1795 GCP_2s (c->next_peer),
1796 GCP_is_neighbor (c->next_peer));
1797 return GNUNET_SYSERR;
1798 }
1799 GCP_add_connection (c->next_peer, c, GNUNET_NO);
1800 GCP_add_connection (c->prev_peer, c, GNUNET_YES);
1801
1802 return GNUNET_OK;
1803}
1804
1805
1806/**
1807 * Remove the connection from the list of both neighbors.
1808 *
1809 * @param c Connection.
1810 */
1811static void
1812unregister_neighbors (struct CadetConnection *c)
1813{
1814// struct CadetPeer *peer; FIXME dont use next_peer, prev_peer
1815 /* Either already unregistered or never got registered, it's ok either way. */
1816 if (NULL == c->path)
1817 return;
1818 if (NULL != c->next_peer)
1819 {
1820 GCP_remove_connection (c->next_peer, c);
1821 c->next_peer = NULL;
1822 }
1823 if (NULL != c->prev_peer)
1824 {
1825 GCP_remove_connection (c->prev_peer, c);
1826 c->prev_peer = NULL;
1827 }
1828}
1829
1830
1831/**
1832 * Invalidates all paths towards all peers that comprise the connection which
1833 * rely on the disconnected peer.
1834 *
1835 * ~O(n^3) (peers in connection * paths/peer * links/path)
1836 *
1837 * @param c Connection whose peers' paths to clean.
1838 * @param disconnected Peer that disconnected.
1839 */
1840static void
1841invalidate_paths (struct CadetConnection *c,
1842 struct CadetPeer *disconnected)
1843{
1844 struct CadetPeer *peer;
1845 unsigned int i;
1846
1847 for (i = 0; i < c->path->length; i++)
1848 {
1849 peer = GCP_get_short (c->path->peers[i], GNUNET_NO);
1850 if (NULL != peer)
1851 GCP_notify_broken_link (peer, &my_full_id, GCP_get_id (disconnected));
1852 }
1853}
1854
1855
1856/**
1857 * Bind the connection to the peer and the tunnel to that peer.
1858 *
1859 * If the peer has no tunnel, create one. Update tunnel and connection
1860 * data structres to reflect new status.
1861 *
1862 * @param c Connection.
1863 * @param peer Peer.
1864 */
1865static void
1866add_to_peer (struct CadetConnection *c,
1867 struct CadetPeer *peer)
1868{
1869 GCP_add_tunnel (peer);
1870 c->t = GCP_get_tunnel (peer);
1871 GCT_add_connection (c->t, c);
1872}
1873
1874
1875/**
1876 * Log receipt of message on stderr (INFO level).
1877 *
1878 * @param message Message received.
1879 * @param peer Peer who sent the message.
1880 * @param conn_id Connection ID of the message.
1881 */
1882static void
1883log_message (const struct GNUNET_MessageHeader *message,
1884 const struct CadetPeer *peer,
1885 const struct GNUNET_CADET_ConnectionTunnelIdentifier *conn_id)
1886{
1887 uint16_t size;
1888 uint16_t type;
1889 char *arrow;
1890
1891 size = ntohs (message->size);
1892 type = ntohs (message->type);
1893 switch (type)
1894 {
1895 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1896 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK:
1897 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1898 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1899 arrow = "==";
1900 break;
1901 default:
1902 arrow = "--";
1903 }
1904 LOG (GNUNET_ERROR_TYPE_INFO,
1905 "<%s %s on conn %s from %s, %6u bytes\n",
1906 arrow,
1907 GC_m2s (type),
1908 GNUNET_sh2s (&conn_id->connection_of_tunnel),
1909 GCP_2s(peer),
1910 (unsigned int) size);
1911}
1912
1913/******************************************************************************/
1914/******************************** API ***********************************/
1915/******************************************************************************/
1916
1917/**
1918 * Handler for connection creation.
1919 *
1920 * @param peer Message sender (neighbor).
1921 * @param msg Message itself.
1922 */
1923void
1924GCC_handle_create (struct CadetPeer *peer,
1925 const struct GNUNET_CADET_ConnectionCreateMessage *msg)
1926{
1927 static struct CadetEncryptedMessageIdentifier zero;
1928 const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid;
1929 struct GNUNET_PeerIdentity *id;
1930 struct CadetPeerPath *path;
1931 struct CadetPeer *dest_peer;
1932 struct CadetPeer *orig_peer;
1933 struct CadetConnection *c;
1934 unsigned int own_pos;
1935 uint16_t size;
1936
1937 GCC_check_connections ();
1938 size = ntohs (msg->header.size);
1939
1940 /* Calculate hops */
1941 size -= sizeof (struct GNUNET_CADET_ConnectionCreateMessage);
1942 if (0 != size % sizeof (struct GNUNET_PeerIdentity))
1943 {
1944 GNUNET_break_op (0);
1945 return;
1946 }
1947 size /= sizeof (struct GNUNET_PeerIdentity);
1948 if (1 > size)
1949 {
1950 GNUNET_break_op (0);
1951 return;
1952 }
1953 LOG (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
1954
1955 /* Get parameters */
1956 cid = &msg->cid;
1957 log_message (&msg->header, peer, cid);
1958 id = (struct GNUNET_PeerIdentity *) &msg[1];
1959 LOG (GNUNET_ERROR_TYPE_DEBUG, " origin: %s\n", GNUNET_i2s (id));
1960
1961 /* Create connection */
1962 c = connection_get (cid);
1963 if (NULL == c)
1964 {
1965 path = path_build_from_peer_ids ((struct GNUNET_PeerIdentity *) &msg[1],
1966 size, myid, &own_pos);
1967 if (NULL == path)
1968 {
1969 /* Path was malformed, probably our own ID was not in it. */
1970 GNUNET_STATISTICS_update (stats, "# malformed paths", 1, GNUNET_NO);
1971 GNUNET_break_op (0);
1972 return;
1973 }
1974 if (0 == own_pos)
1975 {
1976 /* We received this request from a neighbor, we cannot be origin */
1977 GNUNET_STATISTICS_update (stats, "# fake paths", 1, GNUNET_NO);
1978 GNUNET_break_op (0);
1979 path_destroy (path);
1980 return;
1981 }
1982
1983 LOG (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
1984 LOG (GNUNET_ERROR_TYPE_DEBUG, " Creating connection\n");
1985 c = GCC_new (cid, NULL, path, own_pos);
1986 if (NULL == c)
1987 {
1988 if (path->length - 1 == own_pos)
1989 {
1990 /* If we are destination, why did the creation fail? */
1991 GNUNET_break (0);
1992 path_destroy (path);
1993 GCC_check_connections ();
1994 return;
1995 }
1996 send_broken_unknown (cid, &my_full_id,
1997 GNUNET_PEER_resolve2 (path->peers[own_pos + 1]),
1998 peer);
1999 path_destroy (path);
2000 GCC_check_connections ();
2001 return;
2002 }
2003 GCP_add_path_to_all (path, GNUNET_NO);
2004 connection_reset_timeout (c, GNUNET_YES);
2005 }
2006 else
2007 {
2008 path = path_duplicate (c->path);
2009 }
2010 if (CADET_CONNECTION_NEW == c->state)
2011 connection_change_state (c, CADET_CONNECTION_SENT);
2012
2013 /* Remember peers */
2014 dest_peer = GCP_get (&id[size - 1], GNUNET_YES);
2015 orig_peer = GCP_get (&id[0], GNUNET_YES);
2016
2017 /* Is it a connection to us? */
2018 if (c->own_pos == path->length - 1)
2019 {
2020 LOG (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
2021 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_YES);
2022
2023 add_to_peer (c, orig_peer);
2024 if (GNUNET_YES == does_connection_exist (c))
2025 {
2026 /* Peer created a connection equal to one we think exists
2027 * and is fine.
2028 * Solution: Keep both and postpone disambiguation. In the meantime
2029 * the connection will time out or peer will inform us it is broken.
2030 *
2031 * Other options:
2032 * - Use explicit duplicate.
2033 * - Accept new conn and destroy the old. (interruption in higher level)
2034 * - Keep the one with higher ID / created by peer with higher ID. */
2035 schedule_check_duplicates (c);
2036 }
2037
2038 if (CADET_TUNNEL_NEW == GCT_get_cstate (c->t))
2039 GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
2040 if (NULL == c->maintenance_q)
2041 send_connection_ack (c, GNUNET_NO);
2042 if (CADET_CONNECTION_SENT == c->state)
2043 connection_change_state (c, CADET_CONNECTION_ACK);
2044 }
2045 else
2046 {
2047 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2048 GCP_add_path (dest_peer, path_duplicate (path), GNUNET_NO);
2049 GCP_add_path_to_origin (orig_peer, path_duplicate (path), GNUNET_NO);
2050 (void) GCC_send_prebuilt_message (&msg->header,
2051 0,
2052 zero,
2053 c,
2054 GNUNET_YES, GNUNET_YES,
2055 NULL, NULL);
2056 }
2057 path_destroy (path);
2058 GCC_check_connections ();
2059}
2060
2061
2062/**
2063 * Handler for connection confirmations.
2064 *
2065 * @param peer Message sender (neighbor).
2066 * @param msg Message itself.
2067 */
2068void
2069GCC_handle_confirm (struct CadetPeer *peer,
2070 const struct GNUNET_CADET_ConnectionCreateAckMessage *msg)
2071{
2072 static struct CadetEncryptedMessageIdentifier zero;
2073 struct CadetConnection *c;
2074 enum CadetConnectionState oldstate;
2075 int fwd;
2076
2077 GCC_check_connections ();
2078 log_message (&msg->header, peer, &msg->cid);
2079 c = connection_get (&msg->cid);
2080 if (NULL == c)
2081 {
2082 GNUNET_STATISTICS_update (stats, "# control on unknown connection",
2083 1, GNUNET_NO);
2084 LOG (GNUNET_ERROR_TYPE_DEBUG,
2085 " don't know the connection!\n");
2086 send_broken_unknown (&msg->cid, &my_full_id, NULL, peer);
2087 GCC_check_connections ();
2088 return;
2089 }
2090 if (GNUNET_NO != c->destroy)
2091 {
2092 GNUNET_assert (CADET_CONNECTION_DESTROYED == c->state);
2093 GNUNET_STATISTICS_update (stats, "# control on dying connection",
2094 1, GNUNET_NO);
2095 LOG (GNUNET_ERROR_TYPE_DEBUG,
2096 "connection %s being destroyed, ignoring confirm\n",
2097 GCC_2s (c));
2098 GCC_check_connections ();
2099 return;
2100 }
2101
2102 oldstate = c->state;
2103 LOG (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GCP_2s (peer));
2104 if (get_next_hop (c) == peer)
2105 {
2106 LOG (GNUNET_ERROR_TYPE_DEBUG, " SYNACK\n");
2107 fwd = GNUNET_NO;
2108 if (CADET_CONNECTION_SENT == oldstate)
2109 connection_change_state (c, CADET_CONNECTION_ACK);
2110 }
2111 else if (get_prev_hop (c) == peer)
2112 {
2113 LOG (GNUNET_ERROR_TYPE_DEBUG, " FINAL ACK\n");
2114 fwd = GNUNET_YES;
2115 connection_change_state (c, CADET_CONNECTION_READY);
2116 }
2117 else
2118 {
2119 GNUNET_STATISTICS_update (stats, "# control on connection from wrong peer",
2120 1, GNUNET_NO);
2121 GNUNET_break_op (0);
2122 return;
2123 }
2124
2125 connection_reset_timeout (c, fwd);
2126
2127 GNUNET_assert (NULL != c->path);
2128 GCP_add_path_to_all (c->path, GNUNET_YES);
2129
2130 /* Message for us as creator? */
2131 if (GNUNET_YES == GCC_is_origin (c, GNUNET_YES))
2132 {
2133 if (GNUNET_NO != fwd)
2134 {
2135 GNUNET_break (0);
2136 return;
2137 }
2138 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection (SYN)ACK for us!\n");
2139
2140 /* If just created, cancel the short timeout and start a long one */
2141 if (CADET_CONNECTION_SENT == oldstate)
2142 {
2143 c->create_retry = 1;
2144 connection_reset_timeout (c, GNUNET_YES);
2145 }
2146
2147 /* Change connection state, send ACK */
2148 connection_change_state (c, CADET_CONNECTION_READY);
2149 send_connection_ack (c, GNUNET_YES);
2150
2151 /* Change tunnel state, trigger KX */
2152 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2153 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2154 GCC_check_connections ();
2155 return;
2156 }
2157
2158 /* Message for us as destination? */
2159 if (GCC_is_terminal (c, GNUNET_YES))
2160 {
2161 if (GNUNET_YES != fwd)
2162 {
2163 GNUNET_break (0);
2164 return;
2165 }
2166 LOG (GNUNET_ERROR_TYPE_DEBUG, " Connection ACK for us!\n");
2167
2168 /* If just created, cancel the short timeout and start a long one */
2169 if (CADET_CONNECTION_ACK == oldstate)
2170 connection_reset_timeout (c, GNUNET_NO);
2171
2172 /* Change tunnel state */
2173 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2174 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2175 GCC_check_connections ();
2176 }
2177 else
2178 {
2179 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2180 (void) GCC_send_prebuilt_message (&msg->header, 0,
2181 zero,
2182 c,
2183 fwd,
2184 GNUNET_YES, NULL, NULL);
2185 }
2186 GCC_check_connections ();
2187}
2188
2189
2190/**
2191 * Handler for notifications of broken connections.
2192 *
2193 * @param peer Message sender (neighbor).
2194 * @param msg Message itself.
2195 */
2196void
2197GCC_handle_broken (struct CadetPeer *peer,
2198 const struct GNUNET_CADET_ConnectionBrokenMessage *msg)
2199{
2200 static struct CadetEncryptedMessageIdentifier zero;
2201 struct CadetConnection *c;
2202 struct CadetTunnel *t;
2203 int fwd;
2204
2205 GCC_check_connections ();
2206 log_message (&msg->header, peer, &msg->cid);
2207 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer1));
2208 LOG (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer2));
2209 c = connection_get (&msg->cid);
2210 if (NULL == c)
2211 {
2212 LOG (GNUNET_ERROR_TYPE_DEBUG, " duplicate CONNECTION_BROKEN\n");
2213 GNUNET_STATISTICS_update (stats, "# duplicate CONNECTION_BROKEN",
2214 1, GNUNET_NO);
2215 GCC_check_connections ();
2216 return;
2217 }
2218
2219 t = c->t;
2220
2221 fwd = is_fwd (c, peer);
2222 if (GNUNET_SYSERR == fwd)
2223 {
2224 GNUNET_break_op (0);
2225 GCC_check_connections ();
2226 return;
2227 }
2228 mark_destroyed (c);
2229 if (GCC_is_terminal (c, fwd))
2230 {
2231 struct CadetPeer *endpoint;
2232
2233 if (NULL == t)
2234 {
2235 /* A terminal connection should not have 't' set to NULL. */
2236 GNUNET_break (0);
2237 GCC_debug (c, GNUNET_ERROR_TYPE_ERROR);
2238 return;
2239 }
2240 endpoint = GCP_get_short (c->path->peers[c->path->length - 1], GNUNET_YES);
2241 if (2 < c->path->length)
2242 path_invalidate (c->path);
2243 GCP_notify_broken_link (endpoint, &msg->peer1, &msg->peer2);
2244
2245 connection_change_state (c, CADET_CONNECTION_BROKEN);
2246 GCT_remove_connection (t, c);
2247 c->t = NULL;
2248
2249 GCC_destroy (c);
2250 }
2251 else
2252 {
2253 (void) GCC_send_prebuilt_message (&msg->header, 0,
2254 zero, c, fwd,
2255 GNUNET_YES, NULL, NULL);
2256 connection_cancel_queues (c, !fwd);
2257 }
2258 GCC_check_connections ();
2259 return;
2260}
2261
2262
2263/**
2264 * Handler for notifications of destroyed connections.
2265 *
2266 * @param peer Message sender (neighbor).
2267 * @param msg Message itself.
2268 */
2269void
2270GCC_handle_destroy (struct CadetPeer *peer,
2271 const struct GNUNET_CADET_ConnectionDestroyMessage *msg)
2272{
2273 static struct CadetEncryptedMessageIdentifier zero;
2274 struct CadetConnection *c;
2275 int fwd;
2276
2277 GCC_check_connections ();
2278 log_message (&msg->header, peer, &msg->cid);
2279 c = connection_get (&msg->cid);
2280 if (NULL == c)
2281 {
2282 /* Probably already got the message from another path,
2283 * destroyed the tunnel and retransmitted to children.
2284 * Safe to ignore.
2285 */
2286 GNUNET_STATISTICS_update (stats,
2287 "# control on unknown connection",
2288 1, GNUNET_NO);
2289 LOG (GNUNET_ERROR_TYPE_DEBUG,
2290 " connection unknown destroyed: previously destroyed?\n");
2291 GCC_check_connections ();
2292 return;
2293 }
2294
2295 fwd = is_fwd (c, peer);
2296 if (GNUNET_SYSERR == fwd)
2297 {
2298 GNUNET_break_op (0);
2299 GCC_check_connections ();
2300 return;
2301 }
2302
2303 if (GNUNET_NO == GCC_is_terminal (c, fwd))
2304 {
2305 (void) GCC_send_prebuilt_message (&msg->header, 0,
2306 zero, c, fwd,
2307 GNUNET_YES, NULL, NULL);
2308 }
2309 else if (0 == c->pending_messages)
2310 {
2311 LOG (GNUNET_ERROR_TYPE_DEBUG, " directly destroying connection!\n");
2312 GCC_destroy (c);
2313 GCC_check_connections ();
2314 return;
2315 }
2316 mark_destroyed (c);
2317 if (NULL != c->t)
2318 {
2319 GCT_remove_connection (c->t, c);
2320 c->t = NULL;
2321 }
2322 GCC_check_connections ();
2323 return;
2324}
2325
2326
2327/**
2328 * Handler for cadet network traffic hop-by-hop acks.
2329 *
2330 * @param peer Message sender (neighbor).
2331 * @param msg Message itself.
2332 */
2333void
2334GCC_handle_ack (struct CadetPeer *peer,
2335 const struct GNUNET_CADET_ConnectionEncryptedAckMessage *msg)
2336{
2337 struct CadetConnection *c;
2338 struct CadetFlowControl *fc;
2339 struct CadetEncryptedMessageIdentifier ack;
2340 int fwd;
2341
2342 GCC_check_connections ();
2343 log_message (&msg->header, peer, &msg->cid);
2344 c = connection_get (&msg->cid);
2345 if (NULL == c)
2346 {
2347 GNUNET_STATISTICS_update (stats,
2348 "# ack on unknown connection",
2349 1,
2350 GNUNET_NO);
2351 send_broken_unknown (&msg->cid,
2352 &my_full_id,
2353 NULL,
2354 peer);
2355 GCC_check_connections ();
2356 return;
2357 }
2358
2359 /* Is this a forward or backward ACK? */
2360 if (get_next_hop (c) == peer)
2361 {
2362 fc = &c->fwd_fc;
2363 fwd = GNUNET_YES;
2364 }
2365 else if (get_prev_hop (c) == peer)
2366 {
2367 fc = &c->bck_fc;
2368 fwd = GNUNET_NO;
2369 }
2370 else
2371 {
2372 GNUNET_break_op (0);
2373 return;
2374 }
2375
2376 ack = msg->cemi_max;
2377 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s ACK %u (was %u)\n",
2378 GC_f2s (fwd),
2379 ntohl (ack.pid),
2380 ntohl (fc->last_ack_recv.pid));
2381 if (GC_is_pid_bigger (ntohl (ack.pid),
2382 ntohl (fc->last_ack_recv.pid)))
2383 fc->last_ack_recv = ack;
2384
2385 /* Cancel polling if the ACK is big enough. */
2386 if ( (NULL != fc->poll_task) &
2387 GC_is_pid_bigger (ntohl (fc->last_ack_recv.pid),
2388 ntohl (fc->last_pid_sent.pid)))
2389 {
2390 LOG (GNUNET_ERROR_TYPE_DEBUG, " Cancel poll\n");
2391 GNUNET_SCHEDULER_cancel (fc->poll_task);
2392 fc->poll_task = NULL;
2393 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
2394 }
2395
2396 GCC_check_connections ();
2397}
2398
2399
2400/**
2401 * Handler for cadet network traffic hop-by-hop data counter polls.
2402 *
2403 * @param peer Message sender (neighbor).
2404 * @param msg Message itself.
2405 */
2406void
2407GCC_handle_poll (struct CadetPeer *peer,
2408 const struct GNUNET_CADET_ConnectionHopByHopPollMessage *msg)
2409{
2410 struct CadetConnection *c;
2411 struct CadetFlowControl *fc;
2412 struct CadetEncryptedMessageIdentifier pid;
2413 int fwd;
2414
2415 GCC_check_connections ();
2416 log_message (&msg->header, peer, &msg->cid);
2417 c = connection_get (&msg->cid);
2418 if (NULL == c)
2419 {
2420 GNUNET_STATISTICS_update (stats, "# poll on unknown connection", 1,
2421 GNUNET_NO);
2422 LOG (GNUNET_ERROR_TYPE_DEBUG,
2423 "POLL message on unknown connection %s!\n",
2424 GNUNET_sh2s (&msg->cid.connection_of_tunnel));
2425 send_broken_unknown (&msg->cid,
2426 &my_full_id,
2427 NULL,
2428 peer);
2429 GCC_check_connections ();
2430 return;
2431 }
2432
2433 /* Is this a forward or backward ACK?
2434 * Note: a poll should never be needed in a loopback case,
2435 * since there is no possiblility of packet loss there, so
2436 * this way of discerining FWD/BCK should not be a problem.
2437 */
2438 if (get_next_hop (c) == peer)
2439 {
2440 LOG (GNUNET_ERROR_TYPE_DEBUG, " FWD FC\n");
2441 fc = &c->fwd_fc;
2442 }
2443 else if (get_prev_hop (c) == peer)
2444 {
2445 LOG (GNUNET_ERROR_TYPE_DEBUG, " BCK FC\n");
2446 fc = &c->bck_fc;
2447 }
2448 else
2449 {
2450 GNUNET_break_op (0);
2451 return;
2452 }
2453
2454 pid = msg->cemi;
2455 LOG (GNUNET_ERROR_TYPE_DEBUG,
2456 " PID %u, OLD %u\n",
2457 ntohl (pid.pid),
2458 ntohl (fc->last_pid_recv.pid));
2459 fc->last_pid_recv = pid;
2460 fwd = fc == &c->bck_fc;
2461 GCC_send_ack (c, fwd, GNUNET_YES);
2462 GCC_check_connections ();
2463}
2464
2465
2466/**
2467 * Check the message against internal state and test if it goes FWD or BCK.
2468 *
2469 * Updates the PID, state and timeout values for the connection.
2470 *
2471 * @param message Message to check. It must belong to an existing connection.
2472 * @param cid Connection ID (even if @a c is NULL, the ID is still needed).
2473 * @param c Connection this message should belong. If NULL, check fails.
2474 * @param sender Neighbor that sent the message.
2475 *
2476 * @return #GNUNET_YES if the message goes FWD.
2477 * #GNUNET_NO if it goes BCK.
2478 * #GNUNET_SYSERR if there is an error (unauthorized sender, ...).
2479 */
2480static int
2481check_message (const struct GNUNET_MessageHeader *message,
2482 const struct GNUNET_CADET_ConnectionTunnelIdentifier* cid,
2483 struct CadetConnection *c,
2484 struct CadetPeer *sender,
2485 struct CadetEncryptedMessageIdentifier pid)
2486{
2487 struct CadetFlowControl *fc;
2488 struct CadetPeer *hop;
2489 int fwd;
2490 uint16_t type;
2491
2492 /* Check connection */
2493 if (NULL == c)
2494 {
2495 GNUNET_STATISTICS_update (stats,
2496 "# unknown connection",
2497 1, GNUNET_NO);
2498 LOG (GNUNET_ERROR_TYPE_DEBUG,
2499 "%s on unknown connection %s\n",
2500 GC_m2s (ntohs (message->type)),
2501 GNUNET_sh2s (&cid->connection_of_tunnel));
2502 GNUNET_break_op (0);
2503 send_broken_unknown (cid,
2504 &my_full_id,
2505 NULL,
2506 sender);
2507 return GNUNET_SYSERR;
2508 }
2509
2510 /* Check if origin is as expected */
2511 hop = get_prev_hop (c);
2512 if (sender == hop)
2513 {
2514 fwd = GNUNET_YES;
2515 }
2516 else
2517 {
2518 hop = get_next_hop (c);
2519 GNUNET_break (hop == c->next_peer);
2520 if (sender == hop)
2521 {
2522 fwd = GNUNET_NO;
2523 }
2524 else
2525 {
2526 /* Unexpected peer sending traffic on a connection. */
2527 GNUNET_break_op (0);
2528 return GNUNET_SYSERR;
2529 }
2530 }
2531
2532 /* Check PID for payload messages */
2533 type = ntohs (message->type);
2534 if (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED == type)
2535 {
2536 fc = fwd ? &c->bck_fc : &c->fwd_fc;
2537 LOG (GNUNET_ERROR_TYPE_DEBUG, " PID %u (expected in interval [%u,%u])\n",
2538 ntohl (pid.pid),
2539 ntohl (fc->last_pid_recv.pid) + 1,
2540 ntohl (fc->last_ack_sent.pid));
2541 if (GC_is_pid_bigger (ntohl (pid.pid),
2542 ntohl (fc->last_ack_sent.pid)))
2543 {
2544 GNUNET_STATISTICS_update (stats,
2545 "# unsolicited message",
2546 1,
2547 GNUNET_NO);
2548 LOG (GNUNET_ERROR_TYPE_WARNING,
2549 "Received PID %u, (prev %u), ACK %u\n",
2550 pid, fc->last_pid_recv, fc->last_ack_sent);
2551 return GNUNET_SYSERR;
2552 }
2553 if (GC_is_pid_bigger (ntohl (pid.pid),
2554 ntohl (fc->last_pid_recv.pid)))
2555 {
2556 unsigned int delta;
2557
2558 delta = ntohl (pid.pid) - ntohl (fc->last_pid_recv.pid);
2559 fc->last_pid_recv = pid;
2560 fc->recv_bitmap <<= delta;
2561 fc->recv_bitmap |= 1;
2562 }
2563 else
2564 {
2565 GNUNET_STATISTICS_update (stats,
2566 "# out of order PID",
2567 1,
2568 GNUNET_NO);
2569 if (GNUNET_NO == is_ooo_ok (fc->last_pid_recv,
2570 pid,
2571 fc->recv_bitmap))
2572 {
2573 LOG (GNUNET_ERROR_TYPE_WARNING,
2574 "PID %u unexpected (%u+), dropping!\n",
2575 ntohl (pid.pid),
2576 ntohl (fc->last_pid_recv.pid) - 31);
2577 return GNUNET_SYSERR;
2578 }
2579 fc->recv_bitmap |= get_recv_bitmask (fc->last_pid_recv,
2580 pid);
2581 }
2582 }
2583
2584 /* Count as connection confirmation. */
2585 if ( (CADET_CONNECTION_SENT == c->state) ||
2586 (CADET_CONNECTION_ACK == c->state) )
2587 {
2588 connection_change_state (c, CADET_CONNECTION_READY);
2589 if (NULL != c->t)
2590 {
2591 if (CADET_TUNNEL_WAITING == GCT_get_cstate (c->t))
2592 GCT_change_cstate (c->t, CADET_TUNNEL_READY);
2593 }
2594 }
2595 connection_reset_timeout (c, fwd);
2596
2597 return fwd;
2598}
2599
2600
2601/**
2602 * Handler for key exchange traffic (Axolotl KX).
2603 *
2604 * @param peer Message sender (neighbor).
2605 * @param msg Message itself.
2606 */
2607void
2608GCC_handle_kx (struct CadetPeer *peer,
2609 const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
2610{
2611 static struct CadetEncryptedMessageIdentifier zero;
2612 const struct GNUNET_CADET_ConnectionTunnelIdentifier* cid;
2613 struct CadetConnection *c;
2614 int fwd;
2615
2616 GCC_check_connections ();
2617 cid = &msg->cid;
2618 log_message (&msg->header, peer, cid);
2619
2620 c = connection_get (cid);
2621 fwd = check_message (&msg->header,
2622 cid,
2623 c,
2624 peer,
2625 zero);
2626
2627 /* If something went wrong, discard message. */
2628 if (GNUNET_SYSERR == fwd)
2629 {
2630 GNUNET_break_op (0);
2631 GCC_check_connections ();
2632 return;
2633 }
2634
2635 /* Is this message for us? */
2636 if (GCC_is_terminal (c, fwd))
2637 {
2638 LOG (GNUNET_ERROR_TYPE_DEBUG, " message for us!\n");
2639 GNUNET_STATISTICS_update (stats, "# received KX", 1, GNUNET_NO);
2640 if (NULL == c->t)
2641 {
2642 GNUNET_break (0);
2643 return;
2644 }
2645 GCT_handle_kx (c->t, msg);
2646 GCC_check_connections ();
2647 return;
2648 }
2649
2650 /* Message not for us: forward to next hop */
2651 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2652 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2653 (void) GCC_send_prebuilt_message (&msg->header, 0,
2654 zero, c, fwd,
2655 GNUNET_NO, NULL, NULL);
2656 GCC_check_connections ();
2657}
2658
2659
2660/**
2661 * Handler for encrypted cadet network traffic (channel mgmt, data).
2662 *
2663 * @param peer Message sender (neighbor).
2664 * @param msg Message itself.
2665 */
2666void
2667GCC_handle_encrypted (struct CadetPeer *peer,
2668 const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
2669{
2670 static struct CadetEncryptedMessageIdentifier zero;
2671 const struct GNUNET_CADET_ConnectionTunnelIdentifier* cid;
2672 struct CadetConnection *c;
2673 struct CadetEncryptedMessageIdentifier pid;
2674 int fwd;
2675
2676 GCC_check_connections ();
2677 cid = &msg->cid;
2678 pid = msg->cemi;
2679 log_message (&msg->header, peer, cid);
2680
2681 c = connection_get (cid);
2682 fwd = check_message (&msg->header,
2683 cid,
2684 c,
2685 peer,
2686 pid);
2687
2688 /* If something went wrong, discard message. */
2689 if (GNUNET_SYSERR == fwd)
2690 {
2691 GCC_check_connections ();
2692 return;
2693 }
2694
2695 /* Is this message for us? */
2696 if (GCC_is_terminal (c, fwd))
2697 {
2698 GNUNET_STATISTICS_update (stats, "# received encrypted", 1, GNUNET_NO);
2699
2700 if (NULL == c->t)
2701 {
2702 GNUNET_break (GNUNET_NO != c->destroy);
2703 return;
2704 }
2705 GCT_handle_encrypted (c->t, msg);
2706 GCC_send_ack (c, fwd, GNUNET_NO);
2707 GCC_check_connections ();
2708 return;
2709 }
2710
2711 /* Message not for us: forward to next hop */
2712 LOG (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
2713 GNUNET_STATISTICS_update (stats, "# messages forwarded", 1, GNUNET_NO);
2714 (void) GCC_send_prebuilt_message (&msg->header, 0,
2715 zero, c, fwd,
2716 GNUNET_NO, NULL, NULL);
2717 GCC_check_connections ();
2718}
2719
2720
2721/**
2722 * Initialize the connections subsystem
2723 *
2724 * @param c Configuration handle.
2725 */
2726void
2727GCC_init (const struct GNUNET_CONFIGURATION_Handle *c)
2728{
2729 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2730 if (GNUNET_OK !=
2731 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_MSGS_QUEUE",
2732 &max_msgs_queue))
2733 {
2734 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2735 "CADET", "MAX_MSGS_QUEUE", "MISSING");
2736 GNUNET_SCHEDULER_shutdown ();
2737 return;
2738 }
2739
2740 if (GNUNET_OK !=
2741 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_CONNECTIONS",
2742 &max_connections))
2743 {
2744 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2745 "CADET", "MAX_CONNECTIONS", "MISSING");
2746 GNUNET_SCHEDULER_shutdown ();
2747 return;
2748 }
2749
2750 if (GNUNET_OK !=
2751 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REFRESH_CONNECTION_TIME",
2752 &refresh_connection_time))
2753 {
2754 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR,
2755 "CADET", "REFRESH_CONNECTION_TIME", "MISSING");
2756 GNUNET_SCHEDULER_shutdown ();
2757 return;
2758 }
2759 create_connection_time = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
2760 refresh_connection_time);
2761 connections = GNUNET_CONTAINER_multishortmap_create (1024,
2762 GNUNET_YES);
2763}
2764
2765
2766/**
2767 * Destroy each connection on shutdown.
2768 *
2769 * @param cls Closure (unused).
2770 * @param key Current key code (CID, unused).
2771 * @param value Value in the hash map (`struct CadetConnection`)
2772 *
2773 * @return #GNUNET_YES, because we should continue to iterate
2774 */
2775static int
2776shutdown_iterator (void *cls,
2777 const struct GNUNET_ShortHashCode *key,
2778 void *value)
2779{
2780 struct CadetConnection *c = value;
2781
2782 c->state = CADET_CONNECTION_DESTROYED;
2783 GCC_destroy (c);
2784 return GNUNET_YES;
2785}
2786
2787
2788/**
2789 * Shut down the connections subsystem.
2790 */
2791void
2792GCC_shutdown (void)
2793{
2794 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down connections\n");
2795 GCC_check_connections ();
2796 GNUNET_CONTAINER_multishortmap_iterate (connections,
2797 &shutdown_iterator,
2798 NULL);
2799 GNUNET_CONTAINER_multishortmap_destroy (connections);
2800 connections = NULL;
2801}
2802
2803
2804/**
2805 * Create a connection.
2806 *
2807 * @param cid Connection ID (either created locally or imposed remotely).
2808 * @param t Tunnel this connection belongs to (or NULL for transit connections);
2809 * @param path Path this connection has to use (copy is made).
2810 * @param own_pos Own position in the @c path path.
2811 *
2812 * @return Newly created connection.
2813 * NULL in case of error: own id not in path, wrong neighbors, ...
2814*/
2815struct CadetConnection *
2816GCC_new (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
2817 struct CadetTunnel *t,
2818 struct CadetPeerPath *path,
2819 unsigned int own_pos)
2820{
2821 struct CadetConnection *c;
2822 struct CadetPeerPath *cpath;
2823
2824 GCC_check_connections ();
2825 cpath = path_duplicate (path);
2826 GNUNET_assert (NULL != cpath);
2827 c = GNUNET_new (struct CadetConnection);
2828 c->id = *cid;
2829 GNUNET_assert (GNUNET_OK ==
2830 GNUNET_CONTAINER_multishortmap_put (connections,
2831 &c->id.connection_of_tunnel,
2832 c,
2833 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2834 fc_init (&c->fwd_fc);
2835 fc_init (&c->bck_fc);
2836 c->fwd_fc.c = c;
2837 c->bck_fc.c = c;
2838
2839 c->t = t;
2840 GNUNET_assert (own_pos <= cpath->length - 1);
2841 c->own_pos = own_pos;
2842 c->path = cpath;
2843 cpath->c = c;
2844 if (GNUNET_OK != register_neighbors (c))
2845 {
2846 if (0 == own_pos)
2847 {
2848 /* We were the origin of this request, this means we have invalid
2849 * info about the paths to reach the destination. We must invalidate
2850 * the *original* path to avoid trying it again in the next minute.
2851 */
2852 if (2 < path->length)
2853 path_invalidate (path);
2854 else
2855 {
2856 GNUNET_break (0);
2857 GCT_debug(t, GNUNET_ERROR_TYPE_WARNING);
2858 }
2859 c->t = NULL;
2860 }
2861 path_destroy (c->path);
2862 c->path = NULL;
2863 GCC_destroy (c);
2864 return NULL;
2865 }
2866 LOG (GNUNET_ERROR_TYPE_INFO, "New connection %s\n", GCC_2s (c));
2867 GCC_check_connections ();
2868 return c;
2869}
2870
2871
2872/**
2873 * Connection is no longer needed: destroy it.
2874 *
2875 * Cancels all pending traffic (including possible DESTROY messages), all
2876 * maintenance tasks and removes the connection from neighbor peers and tunnel.
2877 *
2878 * @param c Connection to destroy.
2879 */
2880void
2881GCC_destroy (struct CadetConnection *c)
2882{
2883 GCC_check_connections ();
2884 if (NULL == c)
2885 {
2886 GNUNET_break (0);
2887 return;
2888 }
2889
2890 if (2 == c->destroy) /* cancel queues -> GCP_queue_cancel -> q_destroy -> */
2891 return; /* -> message_sent -> GCC_destroy. Don't loop. */
2892 c->destroy = 2;
2893
2894 LOG (GNUNET_ERROR_TYPE_DEBUG,
2895 "destroying connection %s\n",
2896 GCC_2s (c));
2897 LOG (GNUNET_ERROR_TYPE_DEBUG,
2898 " fc's f: %p, b: %p\n",
2899 &c->fwd_fc, &c->bck_fc);
2900 LOG (GNUNET_ERROR_TYPE_DEBUG,
2901 " fc tasks f: %u, b: %u\n",
2902 c->fwd_fc.poll_task,
2903 c->bck_fc.poll_task);
2904
2905 /* Cancel all traffic */
2906 if (NULL != c->path)
2907 {
2908 connection_cancel_queues (c, GNUNET_YES);
2909 connection_cancel_queues (c, GNUNET_NO);
2910 if (NULL != c->maintenance_q)
2911 {
2912 GCP_send_cancel (c->maintenance_q);
2913 c->maintenance_q = NULL;
2914 }
2915 }
2916 unregister_neighbors (c);
2917 path_destroy (c->path);
2918 c->path = NULL;
2919
2920 /* Delete from tunnel */
2921 if (NULL != c->t)
2922 GCT_remove_connection (c->t, c);
2923
2924 if (NULL != c->check_duplicates_task)
2925 GNUNET_SCHEDULER_cancel (c->check_duplicates_task);
2926 if (NULL != c->fwd_maintenance_task)
2927 GNUNET_SCHEDULER_cancel (c->fwd_maintenance_task);
2928 if (NULL != c->bck_maintenance_task)
2929 GNUNET_SCHEDULER_cancel (c->bck_maintenance_task);
2930
2931 if (GNUNET_NO == c->was_removed)
2932 {
2933 GNUNET_break (GNUNET_YES ==
2934 GNUNET_CONTAINER_multishortmap_remove (connections,
2935 &c->id.connection_of_tunnel,
2936 c));
2937 }
2938 GNUNET_STATISTICS_update (stats,
2939 "# connections",
2940 -1,
2941 GNUNET_NO);
2942 GNUNET_free (c);
2943 GCC_check_connections ();
2944}
2945
2946
2947/**
2948 * Get the connection ID.
2949 *
2950 * @param c Connection to get the ID from.
2951 *
2952 * @return ID of the connection.
2953 */
2954const struct GNUNET_CADET_ConnectionTunnelIdentifier *
2955GCC_get_id (const struct CadetConnection *c)
2956{
2957 return &c->id;
2958}
2959
2960
2961/**
2962 * Get the connection path.
2963 *
2964 * @param c Connection to get the path from.
2965 *
2966 * @return path used by the connection.
2967 */
2968const struct CadetPeerPath *
2969GCC_get_path (const struct CadetConnection *c)
2970{
2971 if (GNUNET_NO == c->destroy)
2972 return c->path;
2973 return NULL;
2974}
2975
2976
2977/**
2978 * Get the connection state.
2979 *
2980 * @param c Connection to get the state from.
2981 *
2982 * @return state of the connection.
2983 */
2984enum CadetConnectionState
2985GCC_get_state (const struct CadetConnection *c)
2986{
2987 return c->state;
2988}
2989
2990/**
2991 * Get the connection tunnel.
2992 *
2993 * @param c Connection to get the tunnel from.
2994 *
2995 * @return tunnel of the connection.
2996 */
2997struct CadetTunnel *
2998GCC_get_tunnel (const struct CadetConnection *c)
2999{
3000 return c->t;
3001}
3002
3003
3004/**
3005 * Get free buffer space in a connection.
3006 *
3007 * @param c Connection.
3008 * @param fwd Is query about FWD traffic?
3009 *
3010 * @return Free buffer space [0 - max_msgs_queue/max_connections]
3011 */
3012unsigned int
3013GCC_get_buffer (struct CadetConnection *c, int fwd)
3014{
3015 struct CadetFlowControl *fc;
3016
3017 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3018
3019 LOG (GNUNET_ERROR_TYPE_DEBUG, " Get %s buffer on %s: %u - %u\n",
3020 GC_f2s (fwd), GCC_2s (c), fc->queue_max, fc->queue_n);
3021 GCC_debug (c, GNUNET_ERROR_TYPE_DEBUG);
3022
3023 return (fc->queue_max - fc->queue_n);
3024}
3025
3026
3027/**
3028 * Get how many messages have we allowed to send to us from a direction.
3029 *
3030 * @param c Connection.
3031 * @param fwd Are we asking about traffic from FWD (BCK messages)?
3032 *
3033 * @return last_ack_sent - last_pid_recv
3034 */
3035unsigned int
3036GCC_get_allowed (struct CadetConnection *c, int fwd)
3037{
3038 struct CadetFlowControl *fc;
3039
3040 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3041 if ( (CADET_CONNECTION_READY != c->state) ||
3042 GC_is_pid_bigger (ntohl (fc->last_pid_recv.pid),
3043 ntohl (fc->last_ack_sent.pid)) )
3044 {
3045 return 0;
3046 }
3047 return (ntohl (fc->last_ack_sent.pid) - ntohl (fc->last_pid_recv.pid));
3048}
3049
3050
3051/**
3052 * Get messages queued in a connection.
3053 *
3054 * @param c Connection.
3055 * @param fwd Is query about FWD traffic?
3056 *
3057 * @return Number of messages queued.
3058 */
3059unsigned int
3060GCC_get_qn (struct CadetConnection *c, int fwd)
3061{
3062 struct CadetFlowControl *fc;
3063
3064 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3065
3066 return fc->queue_n;
3067}
3068
3069
3070/**
3071 * Get next PID to use.
3072 *
3073 * @param c Connection.
3074 * @param fwd Is query about FWD traffic?
3075 * @return Next PID to use.
3076 */
3077struct CadetEncryptedMessageIdentifier
3078GCC_get_pid (struct CadetConnection *c, int fwd)
3079{
3080 struct CadetFlowControl *fc;
3081 struct CadetEncryptedMessageIdentifier pid;
3082
3083 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3084 pid = fc->next_pid;
3085 fc->next_pid.pid = htonl (1 + ntohl (pid.pid));
3086 return pid;
3087}
3088
3089
3090/**
3091 * Allow the connection to advertise a buffer of the given size.
3092 *
3093 * The connection will send an @c fwd ACK message (so: in direction !fwd)
3094 * allowing up to last_pid_recv + buffer.
3095 *
3096 * @param c Connection.
3097 * @param buffer How many more messages the connection can accept.
3098 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
3099 */
3100void
3101GCC_allow (struct CadetConnection *c, unsigned int buffer, int fwd)
3102{
3103 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowing %s %u messages %s\n",
3104 GCC_2s (c), buffer, GC_f2s (fwd));
3105 send_ack (c, buffer, fwd, GNUNET_NO);
3106}
3107
3108
3109/**
3110 * Notify other peers on a connection of a broken link. Mark connections
3111 * to destroy after all traffic has been sent.
3112 *
3113 * @param c Connection on which there has been a disconnection.
3114 * @param peer Peer that disconnected.
3115 */
3116void
3117GCC_neighbor_disconnected (struct CadetConnection *c, struct CadetPeer *peer)
3118{
3119 struct CadetFlowControl *fc;
3120 char peer_name[16];
3121 int fwd;
3122
3123 GCC_check_connections ();
3124 strncpy (peer_name, GCP_2s (peer), 16);
3125 peer_name[15] = '\0';
3126 LOG (GNUNET_ERROR_TYPE_DEBUG,
3127 "shutting down %s, %s disconnected\n",
3128 GCC_2s (c), peer_name);
3129
3130 invalidate_paths (c, peer);
3131
3132 fwd = is_fwd (c, peer);
3133 if (GNUNET_SYSERR == fwd)
3134 {
3135 GNUNET_break (0);
3136 return;
3137 }
3138 if ( (GNUNET_YES == GCC_is_terminal (c, fwd)) ||
3139 (GNUNET_NO != c->destroy) )
3140 {
3141 /* Local shutdown, or other peer already down (hence 'c->destroy');
3142 so there is no one to notify about this, just clean up. */
3143 GCC_destroy (c);
3144 GCC_check_connections ();
3145 return;
3146 }
3147 /* Mark FlowControl towards the peer as unavaliable. */
3148 fc = fwd ? &c->bck_fc : &c->fwd_fc;
3149 fc->queue_max = 0;
3150
3151 send_broken (c, &my_full_id, GCP_get_id (peer), fwd);
3152
3153 /* Connection will have at least one pending message
3154 * (the one we just scheduled), so delay destruction
3155 * and remove from map so we don't use accidentally. */
3156 mark_destroyed (c);
3157 GNUNET_assert (GNUNET_NO == c->was_removed);
3158 c->was_removed = GNUNET_YES;
3159 GNUNET_break (GNUNET_YES ==
3160 GNUNET_CONTAINER_multishortmap_remove (connections,
3161 &c->id.connection_of_tunnel,
3162 c));
3163 /* Cancel queue in the direction that just died. */
3164 connection_cancel_queues (c, ! fwd);
3165 GCC_stop_poll (c, ! fwd);
3166 unregister_neighbors (c);
3167 GCC_check_connections ();
3168}
3169
3170
3171/**
3172 * Is this peer the first one on the connection?
3173 *
3174 * @param c Connection.
3175 * @param fwd Is this about fwd traffic?
3176 *
3177 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
3178 */
3179int
3180GCC_is_origin (struct CadetConnection *c, int fwd)
3181{
3182 if (!fwd && c->path->length - 1 == c->own_pos )
3183 return GNUNET_YES;
3184 if (fwd && 0 == c->own_pos)
3185 return GNUNET_YES;
3186 return GNUNET_NO;
3187}
3188
3189
3190/**
3191 * Is this peer the last one on the connection?
3192 *
3193 * @param c Connection.
3194 * @param fwd Is this about fwd traffic?
3195 * Note that the ROOT is the terminal for BCK traffic!
3196 *
3197 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
3198 */
3199int
3200GCC_is_terminal (struct CadetConnection *c, int fwd)
3201{
3202 return GCC_is_origin (c, ! fwd);
3203}
3204
3205
3206/**
3207 * See if we are allowed to send by the next hop in the given direction.
3208 *
3209 * @param c Connection.
3210 * @param fwd Is this about fwd traffic?
3211 *
3212 * @return #GNUNET_YES in case it's OK to send.
3213 */
3214int
3215GCC_is_sendable (struct CadetConnection *c, int fwd)
3216{
3217 struct CadetFlowControl *fc;
3218
3219 LOG (GNUNET_ERROR_TYPE_DEBUG,
3220 " checking sendability of %s traffic on %s\n",
3221 GC_f2s (fwd), GCC_2s (c));
3222 if (NULL == c)
3223 {
3224 GNUNET_break (0);
3225 return GNUNET_YES;
3226 }
3227 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3228 LOG (GNUNET_ERROR_TYPE_DEBUG,
3229 " last ack recv: %u, last pid sent: %u\n",
3230 ntohl (fc->last_ack_recv.pid),
3231 ntohl (fc->last_pid_sent.pid));
3232 if (GC_is_pid_bigger (ntohl (fc->last_ack_recv.pid),
3233 ntohl (fc->last_pid_sent.pid)))
3234 {
3235 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable\n");
3236 return GNUNET_YES;
3237 }
3238 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
3239 return GNUNET_NO;
3240}
3241
3242
3243/**
3244 * Check if this connection is a direct one (never trim a direct connection).
3245 *
3246 * @param c Connection.
3247 *
3248 * @return #GNUNET_YES in case it's a direct connection, #GNUNET_NO otherwise.
3249 */
3250int
3251GCC_is_direct (struct CadetConnection *c)
3252{
3253 return (c->path->length == 2) ? GNUNET_YES : GNUNET_NO;
3254}
3255
3256
3257/**
3258 * Sends a completely built message on a connection, properly registering
3259 * all used resources.
3260 *
3261 * @param message Message to send.
3262 * @param payload_type Type of payload, in case the message is encrypted.
3263 * 0 for restransmissions (when type is no longer known)
3264 * UINT16_MAX when not applicable.
3265 * @param payload_id ID of the payload (PID, ACK, ...).
3266 * @param c Connection on which this message is transmitted.
3267 * @param fwd Is this a fwd message?
3268 * @param force Force the connection to accept the message (buffer overfill).
3269 * @param cont Continuation called once message is sent. Can be NULL.
3270 * @param cont_cls Closure for @c cont.
3271 *
3272 * @return Handle to cancel the message before it's sent.
3273 * NULL on error.
3274 * Invalid on @c cont call.
3275 */
3276struct CadetConnectionQueue *
3277GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3278 uint16_t payload_type,
3279 struct CadetEncryptedMessageIdentifier payload_id,
3280 struct CadetConnection *c, int fwd, int force,
3281 GCC_sent cont, void *cont_cls)
3282{
3283 struct CadetFlowControl *fc;
3284 struct CadetConnectionQueue *q;
3285 uint16_t size;
3286 uint16_t type;
3287
3288 size = ntohs (message->size);
3289 type = ntohs (message->type);
3290
3291 GCC_check_connections ();
3292 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3293 if (0 == fc->queue_max)
3294 {
3295 GNUNET_break (0);
3296 return NULL;
3297 }
3298
3299 LOG (GNUNET_ERROR_TYPE_INFO,
3300 "--> %s (%s %4u) on conn %s (%p) %s [%5u]\n",
3301 GC_m2s (type), GC_m2s (payload_type), payload_id, GCC_2s (c), c,
3302 GC_f2s(fwd), size);
3303 switch (type)
3304 {
3305 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED:
3306 LOG (GNUNET_ERROR_TYPE_DEBUG, " Q_N+ %p %u, PIDsnt: %u, ACKrcv: %u\n",
3307 fc,
3308 fc->queue_n,
3309 ntohl (fc->last_pid_sent.pid),
3310 ntohl (fc->last_ack_recv.pid));
3311 if (GNUNET_NO == force)
3312 {
3313 fc->queue_n++;
3314 }
3315 break;
3316
3317 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_KX:
3318 /* nothing to do here */
3319 break;
3320
3321 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
3322 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK:
3323 /* Should've only be used for restransmissions. */
3324 GNUNET_break (0 == payload_type);
3325 break;
3326
3327 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK:
3328 case GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL:
3329 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
3330 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
3331 GNUNET_assert (GNUNET_YES == force);
3332 break;
3333
3334 default:
3335 GNUNET_break (0);
3336 return NULL;
3337 }
3338
3339 if (fc->queue_n > fc->queue_max && GNUNET_NO == force)
3340 {
3341 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3342 1, GNUNET_NO);
3343 GNUNET_break (0);
3344 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue full: %u/%u\n",
3345 fc->queue_n, fc->queue_max);
3346 if (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED == type)
3347 {
3348 fc->queue_n--;
3349 }
3350 return NULL; /* Drop this message */
3351 }
3352
3353 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %s %u\n",
3354 GCC_2s (c), c->pending_messages);
3355 c->pending_messages++;
3356
3357 q = GNUNET_new (struct CadetConnectionQueue);
3358 q->cont = cont;
3359 q->cont_cls = cont_cls;
3360 q->forced = force;
3361 GNUNET_CONTAINER_DLL_insert (fc->q_head, fc->q_tail, q);
3362 q->peer_q = GCP_send (get_hop (c, fwd),
3363 message,
3364 payload_type,
3365 payload_id,
3366 c,
3367 fwd,
3368 &conn_message_sent, q);
3369 if (NULL == q->peer_q)
3370 {
3371 LOG (GNUNET_ERROR_TYPE_DEBUG, "dropping msg on %s, NULL q\n", GCC_2s (c));
3372 GNUNET_CONTAINER_DLL_remove (fc->q_head, fc->q_tail, q);
3373 GNUNET_free (q);
3374 GCC_check_connections ();
3375 return NULL;
3376 }
3377 GCC_check_connections ();
3378 return q;
3379}
3380
3381
3382/**
3383 * Cancel a previously sent message while it's in the queue.
3384 *
3385 * ONLY can be called before the continuation given to the send function
3386 * is called. Once the continuation is called, the message is no longer in the
3387 * queue.
3388 *
3389 * @param q Handle to the queue.
3390 */
3391void
3392GCC_cancel (struct CadetConnectionQueue *q)
3393{
3394 LOG (GNUNET_ERROR_TYPE_DEBUG, "! GCC cancel message\n");
3395
3396 /* send_cancel calls message_sent, which calls q->cont and frees q */
3397 GCP_send_cancel (q->peer_q);
3398 GCC_check_connections ();
3399}
3400
3401
3402/**
3403 * Sends a CREATE CONNECTION message for a path to a peer.
3404 * Changes the connection and tunnel states if necessary.
3405 *
3406 * @param c Connection to create.
3407 */
3408void
3409GCC_send_create (struct CadetConnection *c)
3410{
3411 static struct CadetEncryptedMessageIdentifier zero;
3412 enum CadetTunnelCState state;
3413 size_t size;
3414
3415 GCC_check_connections ();
3416 size = sizeof (struct GNUNET_CADET_ConnectionCreateMessage);
3417 size += c->path->length * sizeof (struct GNUNET_PeerIdentity);
3418 {
3419 /* Allocate message on the stack */
3420 unsigned char cbuf[size];
3421 struct GNUNET_CADET_ConnectionCreateMessage *msg;
3422 struct GNUNET_PeerIdentity *peers;
3423
3424
3425 msg = (struct GNUNET_CADET_ConnectionCreateMessage *) cbuf;
3426 msg->header.size = htons (size);
3427 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
3428 msg->options = htonl (0);
3429 msg->cid = *GCC_get_id (c);
3430 peers = (struct GNUNET_PeerIdentity *) &msg[1];
3431 for (int i = 0; i < c->path->length; i++)
3432 {
3433 GNUNET_PEER_resolve (c->path->peers[i], peers++);
3434 }
3435 GNUNET_assert (NULL == c->maintenance_q);
3436 c->maintenance_q = GCP_send (get_next_hop (c),
3437 &msg->header,
3438 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE,
3439 zero,
3440 c, GNUNET_YES,
3441 &conn_message_sent, NULL);
3442 }
3443
3444 LOG (GNUNET_ERROR_TYPE_INFO, "==> %s %19s on conn %s (%p) FWD [%5u]\n",
3445 GC_m2s (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE), "",
3446 GCC_2s (c), c, size);
3447 LOG (GNUNET_ERROR_TYPE_DEBUG, " C_P+ %p %u (create)\n",
3448 c, c->pending_messages);
3449 c->pending_messages++;
3450
3451 state = GCT_get_cstate (c->t);
3452 if (CADET_TUNNEL_SEARCHING == state || CADET_TUNNEL_NEW == state)
3453 GCT_change_cstate (c->t, CADET_TUNNEL_WAITING);
3454 if (CADET_CONNECTION_NEW == c->state)
3455 connection_change_state (c, CADET_CONNECTION_SENT);
3456 GCC_check_connections ();
3457}
3458
3459
3460/**
3461 * Send an ACK on the appropriate connection/channel, depending on
3462 * the direction and the position of the peer.
3463 *
3464 * @param c Which connection to send the hop-by-hop ACK.
3465 * @param fwd Is this a fwd ACK? (will go dest->root).
3466 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
3467 */
3468void
3469GCC_send_ack (struct CadetConnection *c, int fwd, int force)
3470{
3471 unsigned int buffer;
3472
3473 GCC_check_connections ();
3474 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCC send %s ACK on %s\n",
3475 GC_f2s (fwd), GCC_2s (c));
3476
3477 if (NULL == c)
3478 {
3479 GNUNET_break (0);
3480 return;
3481 }
3482
3483 if (GNUNET_NO != c->destroy)
3484 {
3485 LOG (GNUNET_ERROR_TYPE_DEBUG, " being destroyed, why bother...\n");
3486 GCC_check_connections ();
3487 return;
3488 }
3489
3490 /* Get available buffer space */
3491 if (GCC_is_terminal (c, fwd))
3492 {
3493 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from all channels\n");
3494 buffer = GCT_get_channels_buffer (c->t);
3495 }
3496 else
3497 {
3498 LOG (GNUNET_ERROR_TYPE_DEBUG, " getting from one connection\n");
3499 buffer = GCC_get_buffer (c, fwd);
3500 }
3501 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer available: %u\n", buffer);
3502 if (0 == buffer && GNUNET_NO == force)
3503 {
3504 GCC_check_connections ();
3505 return;
3506 }
3507
3508 /* Send available buffer space */
3509 if (GNUNET_YES == GCC_is_origin (c, fwd))
3510 {
3511 GNUNET_assert (NULL != c->t);
3512 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on channels...\n");
3513 GCT_unchoke_channels (c->t);
3514 }
3515 else
3516 {
3517 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending on connection\n");
3518 send_ack (c, buffer, fwd, force);
3519 }
3520 GCC_check_connections ();
3521}
3522
3523
3524/**
3525 * Send a message to all peers in this connection that the connection
3526 * is no longer valid.
3527 *
3528 * If some peer should not receive the message, it should be zero'ed out
3529 * before calling this function.
3530 *
3531 * @param c The connection whose peers to notify.
3532 */
3533void
3534GCC_send_destroy (struct CadetConnection *c)
3535{
3536 static struct CadetEncryptedMessageIdentifier zero;
3537 struct GNUNET_CADET_ConnectionDestroyMessage msg;
3538
3539 if (GNUNET_YES == c->destroy)
3540 return;
3541 GCC_check_connections ();
3542 msg.header.size = htons (sizeof (msg));
3543 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY);
3544 msg.cid = c->id;
3545 msg.reserved = htonl (0);
3546 LOG (GNUNET_ERROR_TYPE_DEBUG,
3547 " sending connection destroy for connection %s\n",
3548 GCC_2s (c));
3549
3550 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_YES))
3551 (void) GCC_send_prebuilt_message (&msg.header,
3552 UINT16_MAX,
3553 zero,
3554 c,
3555 GNUNET_YES, GNUNET_YES, NULL, NULL);
3556 if (GNUNET_NO == GCC_is_terminal (c, GNUNET_NO))
3557 (void) GCC_send_prebuilt_message (&msg.header,
3558 UINT16_MAX,
3559 zero,
3560 c,
3561 GNUNET_NO, GNUNET_YES, NULL, NULL);
3562 mark_destroyed (c);
3563 GCC_check_connections ();
3564}
3565
3566
3567/**
3568 * @brief Start a polling timer for the connection.
3569 *
3570 * When a neighbor does not accept more traffic on the connection it could be
3571 * caused by a simple congestion or by a lost ACK. Polling enables to check
3572 * for the lastest ACK status for a connection.
3573 *
3574 * @param c Connection.
3575 * @param fwd Should we poll in the FWD direction?
3576 */
3577void
3578GCC_start_poll (struct CadetConnection *c, int fwd)
3579{
3580 struct CadetFlowControl *fc;
3581
3582 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3583 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL %s requested\n",
3584 GC_f2s (fwd));
3585 if (NULL != fc->poll_task || NULL != fc->poll_msg)
3586 {
3587 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL already in progress (t: %p, m: %p)\n",
3588 fc->poll_task, fc->poll_msg);
3589 return;
3590 }
3591 if (0 == fc->queue_max)
3592 {
3593 /* Should not be needed, traffic should've been cancelled. */
3594 GNUNET_break (0);
3595 LOG (GNUNET_ERROR_TYPE_DEBUG, " POLL not possible, peer disconnected\n");
3596 return;
3597 }
3598 LOG (GNUNET_ERROR_TYPE_DEBUG, "POLL started on request\n");
3599 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, &send_poll, fc);
3600}
3601
3602
3603/**
3604 * @brief Stop polling a connection for ACKs.
3605 *
3606 * Once we have enough ACKs for future traffic, polls are no longer necessary.
3607 *
3608 * @param c Connection.
3609 * @param fwd Should we stop the poll in the FWD direction?
3610 */
3611void
3612GCC_stop_poll (struct CadetConnection *c, int fwd)
3613{
3614 struct CadetFlowControl *fc;
3615
3616 fc = fwd ? &c->fwd_fc : &c->bck_fc;
3617 if (NULL != fc->poll_task)
3618 {
3619 GNUNET_SCHEDULER_cancel (fc->poll_task);
3620 fc->poll_task = NULL;
3621 }
3622 if (NULL != fc->poll_msg)
3623 {
3624 GCC_cancel (fc->poll_msg);
3625 fc->poll_msg = NULL;
3626 }
3627}
3628
3629
3630/**
3631 * Get a (static) string for a connection.
3632 *
3633 * @param c Connection.
3634 */
3635const char *
3636GCC_2s (const struct CadetConnection *c)
3637{
3638 if (NULL == c)
3639 return "NULL";
3640
3641 if (NULL != c->t)
3642 {
3643 static char buf[128];
3644
3645 SPRINTF (buf, "%s (->%s)",
3646 GNUNET_sh2s (&GCC_get_id (c)->connection_of_tunnel),
3647 GCT_2s (c->t));
3648 return buf;
3649 }
3650 return GNUNET_sh2s (&c->id.connection_of_tunnel);
3651}
3652
3653
3654/**
3655 * Log all possible info about the connection state.
3656 *
3657 * @param c Connection to debug.
3658 * @param level Debug level to use.
3659 */
3660void
3661GCC_debug (const struct CadetConnection *c, enum GNUNET_ErrorType level)
3662{
3663 int do_log;
3664 char *s;
3665
3666 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3667 "cadet-con",
3668 __FILE__, __FUNCTION__, __LINE__);
3669 if (0 == do_log)
3670 return;
3671
3672 if (NULL == c)
3673 {
3674 LOG2 (level, "CCC DEBUG NULL CONNECTION\n");
3675 return;
3676 }
3677
3678 LOG2 (level, "CCC DEBUG CONNECTION %s\n", GCC_2s (c));
3679 s = path_2s (c->path);
3680 LOG2 (level, "CCC path %s, own pos: %u\n", s, c->own_pos);
3681 GNUNET_free (s);
3682 LOG2 (level, "CCC state: %s, destroy: %u\n",
3683 GCC_state2s (c->state), c->destroy);
3684 LOG2 (level, "CCC pending messages: %u\n", c->pending_messages);
3685 if (NULL != c->perf)
3686 LOG2 (level, "CCC us/byte: %f\n", c->perf->avg);
3687
3688 LOG2 (level, "CCC FWD flow control:\n");
3689 LOG2 (level, "CCC queue: %u/%u\n", c->fwd_fc.queue_n, c->fwd_fc.queue_max);
3690 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3691 ntohl (c->fwd_fc.last_pid_sent.pid),
3692 ntohl (c->fwd_fc.last_pid_recv.pid));
3693 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3694 ntohl (c->fwd_fc.last_ack_sent.pid),
3695 ntohl (c->fwd_fc.last_ack_recv.pid));
3696 LOG2 (level, "CCC recv PID bitmap: %X\n", c->fwd_fc.recv_bitmap);
3697 LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
3698 c->fwd_fc.poll_task, c->fwd_fc.poll_msg, c->fwd_fc.ack_msg);
3699
3700 LOG2 (level, "CCC BCK flow control:\n");
3701 LOG2 (level, "CCC queue: %u/%u\n", c->bck_fc.queue_n, c->bck_fc.queue_max);
3702 LOG2 (level, "CCC last PID sent: %5u, recv: %5u\n",
3703 ntohl (c->bck_fc.last_pid_sent.pid),
3704 ntohl (c->bck_fc.last_pid_recv.pid));
3705 LOG2 (level, "CCC last ACK sent: %5u, recv: %5u\n",
3706 ntohl (c->bck_fc.last_ack_sent.pid),
3707 ntohl (c->bck_fc.last_ack_recv.pid));
3708 LOG2 (level, "CCC recv PID bitmap: %X\n", c->bck_fc.recv_bitmap);
3709 LOG2 (level, "CCC poll: task %d, msg %p, msg_ack %p)\n",
3710 c->bck_fc.poll_task, c->bck_fc.poll_msg, c->bck_fc.ack_msg);
3711
3712 LOG2 (level, "CCC DEBUG CONNECTION END\n");
3713}
diff --git a/src/cadet/gnunet-service-cadet_connection.h b/src/cadet/gnunet-service-cadet_connection.h
deleted file mode 100644
index 307cb42c2..000000000
--- a/src/cadet/gnunet-service-cadet_connection.h
+++ /dev/null
@@ -1,576 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_connection.h
23 * @brief cadet service; dealing with connections
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file use the prefix GCC (GNUnet Cadet Connection)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_CONNECTION_H
30#define GNUNET_SERVICE_CADET_CONNECTION_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "gnunet_util_lib.h"
41
42
43/**
44 * All the states a connection can be in.
45 */
46enum CadetConnectionState
47{
48 /**
49 * Uninitialized status, should never appear in operation.
50 */
51 CADET_CONNECTION_NEW,
52
53 /**
54 * Connection create message sent, waiting for ACK.
55 */
56 CADET_CONNECTION_SENT,
57
58 /**
59 * Connection ACK sent, waiting for ACK.
60 */
61 CADET_CONNECTION_ACK,
62
63 /**
64 * Connection confirmed, ready to carry traffic.
65 */
66 CADET_CONNECTION_READY,
67
68 /**
69 * Connection to be destroyed, just waiting to empty queues.
70 */
71 CADET_CONNECTION_DESTROYED,
72
73 /**
74 * Connection to be destroyed because of a distant peer, same as DESTROYED.
75 */
76 CADET_CONNECTION_BROKEN,
77};
78
79
80/**
81 * Struct containing all information regarding a connection to a peer.
82 */
83struct CadetConnection;
84
85/**
86 * Handle for messages queued but not yet sent.
87 */
88struct CadetConnectionQueue;
89
90#include "cadet_path.h"
91#include "gnunet-service-cadet_channel.h"
92#include "gnunet-service-cadet_peer.h"
93
94
95/**
96 * Check invariants for all connections using #check_neighbours().
97 */
98void
99GCC_check_connections (void);
100
101
102/**
103 * Callback called when a queued message is sent.
104 *
105 * @param cls Closure.
106 * @param c Connection this message was on.
107 * @param type Type of message sent.
108 * @param fwd Was this a FWD going message?
109 * @param size Size of the message.
110 */
111typedef void
112(*GCC_sent) (void *cls,
113 struct CadetConnection *c,
114 struct CadetConnectionQueue *q,
115 uint16_t type,
116 int fwd,
117 size_t size);
118
119
120/**
121 * Handler for connection creation.
122 *
123 * @param peer Message sender (neighbor).
124 * @param msg Message itself.
125 */
126void
127GCC_handle_create (struct CadetPeer *peer,
128 const struct GNUNET_CADET_ConnectionCreateMessage *msg);
129
130
131/**
132 * Handler for connection confirmations.
133 *
134 * @param peer Message sender (neighbor).
135 * @param msg Message itself.
136 */
137void
138GCC_handle_confirm (struct CadetPeer *peer,
139 const struct GNUNET_CADET_ConnectionCreateAckMessage *msg);
140
141
142/**
143 * Handler for notifications of broken connections.
144 *
145 * @param peer Message sender (neighbor).
146 * @param msg Message itself.
147 */
148void
149GCC_handle_broken (struct CadetPeer *peer,
150 const struct GNUNET_CADET_ConnectionBrokenMessage *msg);
151
152/**
153 * Handler for notifications of destroyed connections.
154 *
155 * @param peer Message sender (neighbor).
156 * @param msg Message itself.
157 */
158void
159GCC_handle_destroy (struct CadetPeer *peer,
160 const struct GNUNET_CADET_ConnectionDestroyMessage *msg);
161
162/**
163 * Handler for cadet network traffic hop-by-hop acks.
164 *
165 * @param peer Message sender (neighbor).
166 * @param msg Message itself.
167 */
168void
169GCC_handle_ack (struct CadetPeer *peer,
170 const struct GNUNET_CADET_ConnectionEncryptedAckMessage *msg);
171
172/**
173 * Handler for cadet network traffic hop-by-hop data counter polls.
174 *
175 * @param peer Message sender (neighbor).
176 * @param msg Message itself.
177 */
178void
179GCC_handle_poll (struct CadetPeer *peer,
180 const struct GNUNET_CADET_ConnectionHopByHopPollMessage *msg);
181
182/**
183 * Handler for key exchange traffic (Axolotl KX).
184 *
185 * @param peer Message sender (neighbor).
186 * @param msg Message itself.
187 */
188void
189GCC_handle_kx (struct CadetPeer *peer,
190 const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg);
191
192/**
193 * Handler for encrypted cadet network traffic (channel mgmt, data).
194 *
195 * @param peer Message sender (neighbor).
196 * @param msg Message itself.
197 */
198void
199GCC_handle_encrypted (struct CadetPeer *peer,
200 const struct GNUNET_CADET_TunnelEncryptedMessage *msg);
201
202/**
203 * Core handler for axolotl key exchange traffic.
204 *
205 * @param cls Closure (unused).
206 * @param message Message received.
207 * @param peer Neighbor who sent the message.
208 *
209 * @return GNUNET_OK, to keep the connection open.
210 */
211int
212GCC_handle_ax_kx (void *cls, const struct GNUNET_PeerIdentity *peer,
213 const struct GNUNET_MessageHeader *message);
214
215/**
216 * Core handler for axolotl encrypted cadet network traffic.
217 *
218 * @param cls Closure (unused).
219 * @param message Message received.
220 * @param peer Neighbor who sent the message.
221 *
222 * @return GNUNET_OK, to keep the connection open.
223 */
224int
225GCC_handle_ax (void *cls, const struct GNUNET_PeerIdentity *peer,
226 struct GNUNET_MessageHeader *message);
227
228/**
229 * Core handler for cadet keepalives.
230 *
231 * @param cls closure
232 * @param message message
233 * @param peer peer identity this notification is about
234 * @return GNUNET_OK to keep the connection open,
235 * GNUNET_SYSERR to close it (signal serious error)
236 *
237 * TODO: Check who we got this from, to validate route.
238 */
239int
240GCC_handle_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
241 const struct GNUNET_MessageHeader *message);
242
243/**
244 * Send an ACK on the appropriate connection/channel, depending on
245 * the direction and the position of the peer.
246 *
247 * @param c Which connection to send the hop-by-hop ACK.
248 * @param fwd Is this a fwd ACK? (will go dest->root).
249 * @param force Send the ACK even if suboptimal (e.g. requested by POLL).
250 */
251void
252GCC_send_ack (struct CadetConnection *c, int fwd, int force);
253
254/**
255 * Initialize the connections subsystem
256 *
257 * @param c Configuration handle.
258 */
259void
260GCC_init (const struct GNUNET_CONFIGURATION_Handle *c);
261
262/**
263 * Shut down the connections subsystem.
264 */
265void
266GCC_shutdown (void);
267
268/**
269 * Create a connection.
270 *
271 * @param cid Connection ID (either created locally or imposed remotely).
272 * @param t Tunnel this connection belongs to (or NULL for transit connections);
273 * @param path Path this connection has to use (copy is made).
274 * @param own_pos Own position in the @c path path.
275 *
276 * @return Newly created connection.
277 * NULL in case of error: own id not in path, wrong neighbors, ...
278 */
279struct CadetConnection *
280GCC_new (const struct GNUNET_CADET_ConnectionTunnelIdentifier *cid,
281 struct CadetTunnel *t,
282 struct CadetPeerPath *path,
283 unsigned int own_pos);
284
285/**
286 * Connection is no longer needed: destroy it.
287 *
288 * Cancels all pending traffic (including possible DESTROY messages), all
289 * maintenance tasks and removes the connection from neighbor peers and tunnel.
290 *
291 * @param c Connection to destroy.
292 */
293void
294GCC_destroy (struct CadetConnection *c);
295
296/**
297 * Get the connection ID.
298 *
299 * @param c Connection to get the ID from.
300 *
301 * @return ID of the connection.
302 */
303const struct GNUNET_CADET_ConnectionTunnelIdentifier *
304GCC_get_id (const struct CadetConnection *c);
305
306
307/**
308 * Get the connection path.
309 *
310 * @param c Connection to get the path from.
311 *
312 * @return path used by the connection.
313 */
314const struct CadetPeerPath *
315GCC_get_path (const struct CadetConnection *c);
316
317/**
318 * Get the connection state.
319 *
320 * @param c Connection to get the state from.
321 *
322 * @return state of the connection.
323 */
324enum CadetConnectionState
325GCC_get_state (const struct CadetConnection *c);
326
327/**
328 * Get the connection tunnel.
329 *
330 * @param c Connection to get the tunnel from.
331 *
332 * @return tunnel of the connection.
333 */
334struct CadetTunnel *
335GCC_get_tunnel (const struct CadetConnection *c);
336
337/**
338 * Get free buffer space in a connection.
339 *
340 * @param c Connection.
341 * @param fwd Is query about FWD traffic?
342 *
343 * @return Free buffer space [0 - max_msgs_queue/max_connections]
344 */
345unsigned int
346GCC_get_buffer (struct CadetConnection *c, int fwd);
347
348/**
349 * Get how many messages have we allowed to send to us from a direction.
350 *
351 * @param c Connection.
352 * @param fwd Are we asking about traffic from FWD (BCK messages)?
353 *
354 * @return last_ack_sent - last_pid_recv
355 */
356unsigned int
357GCC_get_allowed (struct CadetConnection *c, int fwd);
358
359/**
360 * Get messages queued in a connection.
361 *
362 * @param c Connection.
363 * @param fwd Is query about FWD traffic?
364 *
365 * @return Number of messages queued.
366 */
367unsigned int
368GCC_get_qn (struct CadetConnection *c, int fwd);
369
370/**
371 * Get next PID to use.
372 *
373 * @param c Connection.
374 * @param fwd Is query about FWD traffic?
375 * @return Next PID to use.
376 */
377struct CadetEncryptedMessageIdentifier
378GCC_get_pid (struct CadetConnection *c, int fwd);
379
380/**
381 * Allow the connection to advertise a buffer of the given size.
382 *
383 * The connection will send an @c fwd ACK message (so: in direction !fwd)
384 * allowing up to last_pid_recv + buffer.
385 *
386 * @param c Connection.
387 * @param buffer How many more messages the connection can accept.
388 * @param fwd Is this about FWD traffic? (The ack will go dest->root).
389 */
390void
391GCC_allow (struct CadetConnection *c, unsigned int buffer, int fwd);
392
393/**
394 * Send FWD keepalive packets for a connection.
395 *
396 * @param cls Closure (connection for which to send the keepalive).
397 * @param tc Notification context.
398 */
399void
400GCC_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
401
402/**
403 * Send BCK keepalive packets for a connection.
404 *
405 * @param cls Closure (connection for which to send the keepalive).
406 * @param tc Notification context.
407 */
408void
409GCC_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
410
411
412/**
413 * Notify other peers on a connection of a broken link. Mark connections
414 * to destroy after all traffic has been sent.
415 *
416 * @param c Connection on which there has been a disconnection.
417 * @param peer Peer that disconnected.
418 */
419void
420GCC_neighbor_disconnected (struct CadetConnection *c, struct CadetPeer *peer);
421
422/**
423 * Is this peer the first one on the connection?
424 *
425 * @param c Connection.
426 * @param fwd Is this about fwd traffic?
427 *
428 * @return #GNUNET_YES if origin, #GNUNET_NO if relay/terminal.
429 */
430int
431GCC_is_origin (struct CadetConnection *c, int fwd);
432
433/**
434 * Is this peer the last one on the connection?
435 *
436 * @param c Connection.
437 * @param fwd Is this about fwd traffic?
438 * Note that the ROOT is the terminal for BCK traffic!
439 *
440 * @return #GNUNET_YES if terminal, #GNUNET_NO if relay/origin.
441 */
442int
443GCC_is_terminal (struct CadetConnection *c, int fwd);
444
445/**
446 * See if we are allowed to send by the next hop in the given direction.
447 *
448 * @param c Connection.
449 * @param fwd Is this about fwd traffic?
450 *
451 * @return #GNUNET_YES in case it's OK to send.
452 */
453int
454GCC_is_sendable (struct CadetConnection *c, int fwd);
455
456/**
457 * Check if this connection is a direct one (never trim a direct connection).
458 *
459 * @param c Connection.
460 *
461 * @return #GNUNET_YES in case it's a direct connection, #GNUNET_NO otherwise.
462 */
463int
464GCC_is_direct (struct CadetConnection *c);
465
466/**
467 * Cancel a previously sent message while it's in the queue.
468 *
469 * ONLY can be called before the continuation given to the send function
470 * is called. Once the continuation is called, the message is no longer in the
471 * queue.
472 *
473 * @param q Handle to the queue.
474 */
475void
476GCC_cancel (struct CadetConnectionQueue *q);
477
478/**
479 * Sends an already built message on a connection, properly registering
480 * all used resources.
481 *
482 * @param message Message to send.
483 * @param payload_type Type of payload, in case the message is encrypted.
484 * 0 for restransmissions (when type is no longer known)
485 * UINT16_MAX when not applicable.
486 * @param payload_id ID of the payload (PID, ACK, ...).
487 * @param c Connection on which this message is transmitted.
488 * @param fwd Is this a fwd message?
489 * @param force Force the connection to accept the message (buffer overfill).
490 * @param cont Continuation called once message is sent. Can be NULL.
491 * @param cont_cls Closure for @c cont.
492 *
493 * @return Handle to cancel the message before it's sent.
494 * NULL on error.
495 * Invalid on @c cont call.
496 */
497struct CadetConnectionQueue *
498GCC_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
499 uint16_t payload_type,
500 struct CadetEncryptedMessageIdentifier payload_id,
501 struct CadetConnection *c, int fwd, int force,
502 GCC_sent cont, void *cont_cls);
503
504/**
505 * Sends a CREATE CONNECTION message for a path to a peer.
506 * Changes the connection and tunnel states if necessary.
507 *
508 * @param connection Connection to create.
509 */
510void
511GCC_send_create (struct CadetConnection *connection);
512
513/**
514 * Send a message to all peers in this connection that the connection
515 * is no longer valid.
516 *
517 * If some peer should not receive the message, it should be zero'ed out
518 * before calling this function.
519 *
520 * @param c The connection whose peers to notify.
521 */
522void
523GCC_send_destroy (struct CadetConnection *c);
524
525/**
526 * @brief Start a polling timer for the connection.
527 *
528 * When a neighbor does not accept more traffic on the connection it could be
529 * caused by a simple congestion or by a lost ACK. Polling enables to check
530 * for the lastest ACK status for a connection.
531 *
532 * @param c Connection.
533 * @param fwd Should we poll in the FWD direction?
534 */
535void
536GCC_start_poll (struct CadetConnection *c, int fwd);
537
538
539/**
540 * @brief Stop polling a connection for ACKs.
541 *
542 * Once we have enough ACKs for future traffic, polls are no longer necessary.
543 *
544 * @param c Connection.
545 * @param fwd Should we stop the poll in the FWD direction?
546 */
547void
548GCC_stop_poll (struct CadetConnection *c, int fwd);
549
550/**
551 * Get a (static) string for a connection.
552 *
553 * @param c Connection.
554 */
555const char *
556GCC_2s (const struct CadetConnection *c);
557
558/**
559 * Log all possible info about the connection state.
560 *
561 * @param c Connection to debug.
562 * @param level Debug level to use.
563 */
564void
565GCC_debug (const struct CadetConnection *c, enum GNUNET_ErrorType level);
566
567#if 0 /* keep Emacsens' auto-indent happy */
568{
569#endif
570#ifdef __cplusplus
571}
572#endif
573
574/* ifndef GNUNET_SERVICE_CADET_CONNECTION_H */
575#endif
576/* end of gnunet-service-cadet_connection.h */
diff --git a/src/cadet/gnunet-service-cadet_dht.c b/src/cadet/gnunet-service-cadet_dht.c
deleted file mode 100644
index 22673b167..000000000
--- a/src/cadet/gnunet-service-cadet_dht.c
+++ /dev/null
@@ -1,424 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21
22#include "platform.h"
23#include "gnunet_util_lib.h"
24
25#include "gnunet_dht_service.h"
26#include "gnunet_statistics_service.h"
27
28#include "cadet_path.h"
29#include "gnunet-service-cadet_dht.h"
30#include "gnunet-service-cadet_peer.h"
31#include "gnunet-service-cadet_hello.h"
32
33#define LOG(level, ...) GNUNET_log_from (level,"cadet-dht",__VA_ARGS__)
34
35
36/******************************************************************************/
37/******************************** STRUCTS **********************************/
38/******************************************************************************/
39
40/**
41 * Handle for DHT searches.
42 */
43struct GCD_search_handle
44{
45 /**
46 * DHT_GET handle.
47 */
48 struct GNUNET_DHT_GetHandle *dhtget;
49
50 /**
51 * Provided callback to call when a path is found.
52 */
53 GCD_search_callback callback;
54
55 /**
56 * Provided closure.
57 */
58 void *cls;
59
60 /**
61 * Peer ID searched for
62 */
63 GNUNET_PEER_Id peer_id;
64};
65
66
67/******************************************************************************/
68/******************************* GLOBALS ***********************************/
69/******************************************************************************/
70
71/**
72 * Global handle to the statistics service.
73 */
74extern struct GNUNET_STATISTICS_Handle *stats;
75
76/**
77 * Own ID (short value).
78 */
79extern GNUNET_PEER_Id myid;
80
81/**
82 * Own ID (full value).
83 */
84extern struct GNUNET_PeerIdentity my_full_id;
85
86/**
87 * Handle to use DHT.
88 */
89static struct GNUNET_DHT_Handle *dht_handle;
90
91/**
92 * How often to PUT own ID in the DHT.
93 */
94static struct GNUNET_TIME_Relative id_announce_time;
95
96/**
97 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
98 */
99static unsigned long long dht_replication_level;
100
101/**
102 * Task to periodically announce itself in the network.
103 */
104static struct GNUNET_SCHEDULER_Task * announce_id_task;
105
106/**
107 * Delay for the next ID announce.
108 */
109static struct GNUNET_TIME_Relative announce_delay;
110
111/**
112 * GET requests to stop on shutdown.
113 */
114static struct GNUNET_CONTAINER_MultiHashMap32 *get_requests;
115
116/******************************************************************************/
117/******************************** STATIC ***********************************/
118/******************************************************************************/
119
120
121/**
122 * Build a PeerPath from the paths returned from the DHT, reversing the paths
123 * to obtain a local peer -> destination path and interning the peer ids.
124 *
125 * @return Newly allocated and created path
126 *
127 * FIXME refactor and use build_path_from_peer_ids
128 */
129static struct CadetPeerPath *
130path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
131 unsigned int get_path_length,
132 const struct GNUNET_PeerIdentity *put_path,
133 unsigned int put_path_length)
134{
135 size_t size = get_path_length + put_path_length + 1;
136 struct GNUNET_PeerIdentity peers[size];
137 const struct GNUNET_PeerIdentity *peer;
138 struct CadetPeerPath *p;
139 unsigned int own_pos;
140 int i;
141
142 peers[0] = my_full_id;
143 LOG (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", get_path_length);
144 for (i = 0 ; i < get_path_length; i++)
145 {
146 peer = &get_path[get_path_length - i - 1];
147 LOG (GNUNET_ERROR_TYPE_DEBUG, " From GET: %s\n", GNUNET_i2s (peer));
148 peers[i + 1] = *peer;
149 }
150 for (i = 0 ; i < put_path_length; i++)
151 {
152 peer = &put_path[put_path_length - i - 1];
153 LOG (GNUNET_ERROR_TYPE_DEBUG, " From PUT: %s\n", GNUNET_i2s (peer));
154 peers[i + get_path_length + 1] = *peer;
155 }
156 p = path_build_from_peer_ids (peers, size, myid, &own_pos);
157 return p;
158}
159
160
161/**
162 * Function to process paths received for a new peer addition. The recorded
163 * paths form the initial tunnel, which can be optimized later.
164 * Called on each result obtained for the DHT search.
165 *
166 * @param cls closure
167 * @param exp when will this value expire
168 * @param key key of the result
169 * @param get_path path of the get request
170 * @param get_path_length lenght of @a get_path
171 * @param put_path path of the put request
172 * @param put_path_length length of the @a put_path
173 * @param type type of the result
174 * @param size number of bytes in data
175 * @param data pointer to the result data
176 */
177static void
178dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
179 const struct GNUNET_HashCode * key,
180 const struct GNUNET_PeerIdentity *get_path,
181 unsigned int get_path_length,
182 const struct GNUNET_PeerIdentity *put_path,
183 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
184 size_t size, const void *data)
185{
186 struct GCD_search_handle *h = cls;
187 struct GNUNET_HELLO_Message *hello;
188 struct CadetPeerPath *p;
189 struct CadetPeer *peer;
190 char *s;
191
192 p = path_build_from_dht (get_path, get_path_length,
193 put_path, put_path_length);
194 if (NULL == p)
195 {
196 GNUNET_break_op (0);
197 return;
198 }
199
200 s = path_2s (p);
201 LOG (GNUNET_ERROR_TYPE_INFO,
202 "Got path from DHT: %s\n",
203 s);
204 GNUNET_free_non_null (s);
205
206 peer = GCP_get_short (p->peers[p->length - 1], GNUNET_YES);
207 LOG (GNUNET_ERROR_TYPE_DEBUG,
208 "Got HELLO for %s\n",
209 GCP_2s (peer));
210 h->callback (h->cls, p);
211 path_destroy (p);
212 hello = (struct GNUNET_HELLO_Message *) data;
213 GCP_set_hello (peer, hello);
214 GCP_try_connect (peer);
215}
216
217
218/**
219 * Periodically announce self id in the DHT
220 *
221 * @param cls closure
222 */
223static void
224announce_id (void *cls)
225{
226 struct GNUNET_HashCode phash;
227 const struct GNUNET_HELLO_Message *hello;
228 size_t size;
229 struct GNUNET_TIME_Absolute expiration;
230 struct GNUNET_TIME_Relative next_put;
231
232 announce_id_task = NULL;
233 LOG (GNUNET_ERROR_TYPE_DEBUG, "Announce ID\n");
234 hello = GCH_get_mine ();
235 size = (NULL != hello) ? GNUNET_HELLO_size (hello) : 0;
236 if ( (NULL == hello) || (0 == size) )
237 {
238 /* Peerinfo gave us no hello yet, try again soon. */
239 LOG (GNUNET_ERROR_TYPE_INFO,
240 " no hello, waiting!\n");
241 GNUNET_STATISTICS_update (stats,
242 "# DHT announce skipped (no hello)",
243 1,
244 GNUNET_NO);
245 expiration = GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
246 announce_delay);
247 announce_delay = GNUNET_TIME_STD_BACKOFF (announce_delay);
248 }
249 else
250 {
251 expiration = GNUNET_HELLO_get_last_expiration (hello);
252 announce_delay = GNUNET_TIME_UNIT_SECONDS;
253 }
254
255 LOG (GNUNET_ERROR_TYPE_DEBUG,
256 "Hello %p size: %u\n",
257 hello,
258 size);
259 if (NULL != hello)
260 {
261 GNUNET_STATISTICS_update (stats,
262 "# DHT announce",
263 1, GNUNET_NO);
264 memset (&phash,
265 0,
266 sizeof (phash));
267 GNUNET_memcpy (&phash,
268 &my_full_id,
269 sizeof (my_full_id));
270 GNUNET_DHT_put (dht_handle, /* DHT handle */
271 &phash, /* Key to use */
272 dht_replication_level, /* Replication level */
273 GNUNET_DHT_RO_RECORD_ROUTE
274 | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
275 GNUNET_BLOCK_TYPE_DHT_HELLO, /* Block type */
276 size, /* Size of the data */
277 (const char *) hello, /* Data itself */
278 expiration, /* Data expiration */
279 NULL, /* Continuation */
280 NULL); /* Continuation closure */
281 }
282 /* Call again in id_announce_time, unless HELLO expires first,
283 * but wait at least 1s. */
284 next_put = GNUNET_TIME_absolute_get_remaining (expiration);
285 next_put = GNUNET_TIME_relative_min (next_put,
286 id_announce_time);
287 next_put = GNUNET_TIME_relative_max (next_put,
288 GNUNET_TIME_UNIT_SECONDS);
289 announce_id_task = GNUNET_SCHEDULER_add_delayed (next_put,
290 &announce_id,
291 cls);
292}
293
294/**
295 * Iterator over hash map entries and stop GET requests before disconnecting
296 * from the DHT.
297 *
298 * @param cls Closure (unused)
299 * @param key Current peer ID.
300 * @param value Value in the hash map (GCD_search_handle).
301 *
302 * @return #GNUNET_YES, we should continue to iterate,
303 */
304int
305stop_get (void *cls,
306 uint32_t key,
307 void *value)
308{
309 struct GCD_search_handle *h = value;
310
311 GCD_search_stop (h);
312 return GNUNET_YES;
313}
314
315
316/******************************************************************************/
317/******************************** API ***********************************/
318/******************************************************************************/
319
320/**
321 * Initialize the DHT subsystem.
322 *
323 * @param c Configuration.
324 */
325void
326GCD_init (const struct GNUNET_CONFIGURATION_Handle *c)
327{
328 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
329 if (GNUNET_OK !=
330 GNUNET_CONFIGURATION_get_value_number (c, "CADET",
331 "DHT_REPLICATION_LEVEL",
332 &dht_replication_level))
333 {
334 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING, "CADET",
335 "DHT_REPLICATION_LEVEL", "USING DEFAULT");
336 dht_replication_level = 3;
337 }
338
339 if (GNUNET_OK !=
340 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "ID_ANNOUNCE_TIME",
341 &id_announce_time))
342 {
343 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_ERROR, "CADET",
344 "ID_ANNOUNCE_TIME", "MISSING");
345 GNUNET_SCHEDULER_shutdown ();
346 return;
347 }
348
349 dht_handle = GNUNET_DHT_connect (c, 64);
350 if (NULL == dht_handle)
351 {
352 GNUNET_break (0);
353 }
354
355 announce_delay = GNUNET_TIME_UNIT_SECONDS;
356 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, NULL);
357 get_requests = GNUNET_CONTAINER_multihashmap32_create (32);
358}
359
360
361/**
362 * Shut down the DHT subsystem.
363 */
364void
365GCD_shutdown (void)
366{
367 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down DHT\n");
368 GNUNET_CONTAINER_multihashmap32_iterate (get_requests, &stop_get, NULL);
369 GNUNET_CONTAINER_multihashmap32_destroy (get_requests);
370 if (dht_handle != NULL)
371 {
372 GNUNET_DHT_disconnect (dht_handle);
373 dht_handle = NULL;
374 }
375 if (NULL != announce_id_task)
376 {
377 GNUNET_SCHEDULER_cancel (announce_id_task);
378 announce_id_task = NULL;
379 }
380}
381
382struct GCD_search_handle *
383GCD_search (const struct GNUNET_PeerIdentity *peer_id,
384 GCD_search_callback callback, void *cls)
385{
386 struct GNUNET_HashCode phash;
387 struct GCD_search_handle *h;
388
389 LOG (GNUNET_ERROR_TYPE_DEBUG, "Starting DHT GET for peer %s\n",
390 GNUNET_i2s (peer_id));
391 GNUNET_STATISTICS_update (stats, "# DHT search", 1, GNUNET_NO);
392 memset (&phash, 0, sizeof (phash));
393 GNUNET_memcpy (&phash, peer_id, sizeof (*peer_id));
394 h = GNUNET_new (struct GCD_search_handle);
395 h->peer_id = GNUNET_PEER_intern (peer_id);
396 h->callback = callback;
397 h->cls = cls;
398 h->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
399 GNUNET_BLOCK_TYPE_DHT_HELLO, /* type */
400 &phash, /* key to search */
401 dht_replication_level, /* replication level */
402 GNUNET_DHT_RO_RECORD_ROUTE |
403 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
404 NULL, /* xquery */
405 0, /* xquery bits */
406 &dht_get_id_handler,
407 h);
408 GNUNET_CONTAINER_multihashmap32_put (get_requests,
409 h->peer_id,
410 h,
411 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
412 return h;
413}
414
415
416void
417GCD_search_stop (struct GCD_search_handle *h)
418{
419 GNUNET_break (GNUNET_OK ==
420 GNUNET_CONTAINER_multihashmap32_remove (get_requests,
421 h->peer_id, h));
422 GNUNET_DHT_get_stop (h->dhtget);
423 GNUNET_free (h);
424}
diff --git a/src/cadet/gnunet-service-cadet_dht.h b/src/cadet/gnunet-service-cadet_dht.h
deleted file mode 100644
index b70dfe975..000000000
--- a/src/cadet/gnunet-service-cadet_dht.h
+++ /dev/null
@@ -1,93 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_dht.h
23 * @brief cadet service; dealing with DHT requests and results
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMD (Gnunet Cadet Dht)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_DHT_H
30#define GNUNET_SERVICE_CADET_DHT_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42
43struct GCD_search_handle;
44
45
46/**
47 * Callback called on each path found over the DHT.
48 *
49 * @param cls Closure.
50 * @param path An unchecked, unoptimized path to the target node.
51 * After callback will no longer be valid!
52 */
53typedef void
54(*GCD_search_callback) (void *cls,
55 const struct CadetPeerPath *path);
56
57/******************************************************************************/
58/******************************** API ***********************************/
59/******************************************************************************/
60
61/**
62 * Initialize the DHT subsystem.
63 *
64 * @param c Configuration.
65 */
66void
67GCD_init (const struct GNUNET_CONFIGURATION_Handle *c);
68
69/**
70 * Shut down the DHT subsystem.
71 */
72void
73GCD_shutdown (void);
74
75
76struct GCD_search_handle *
77GCD_search (const struct GNUNET_PeerIdentity *peer_id,
78 GCD_search_callback callback, void *cls);
79
80
81void
82GCD_search_stop (struct GCD_search_handle *h);
83
84#if 0 /* keep Emacsens' auto-indent happy */
85{
86#endif
87#ifdef __cplusplus
88}
89#endif
90
91/* ifndef GNUNET_CADET_SERVICE_LOCAL_H */
92#endif
93/* end of gnunet-cadet-service_LOCAL.h */
diff --git a/src/cadet/gnunet-service-cadet_hello.c b/src/cadet/gnunet-service-cadet_hello.c
deleted file mode 100644
index 3c63f3551..000000000
--- a/src/cadet/gnunet-service-cadet_hello.c
+++ /dev/null
@@ -1,200 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2014 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21#include "platform.h"
22#include "gnunet_util_lib.h"
23
24#include "gnunet_statistics_service.h"
25#include "gnunet_peerinfo_service.h"
26
27#include "cadet_protocol.h"
28#include "cadet_path.h"
29
30#include "gnunet-service-cadet_hello.h"
31#include "gnunet-service-cadet_peer.h"
32
33#define LOG(level, ...) GNUNET_log_from(level,"cadet-hll",__VA_ARGS__)
34
35
36/******************************************************************************/
37/******************************** STRUCTS **********************************/
38/******************************************************************************/
39
40
41
42/******************************************************************************/
43/******************************* GLOBALS ***********************************/
44/******************************************************************************/
45
46/**
47 * Global handle to the statistics service.
48 */
49extern struct GNUNET_STATISTICS_Handle *stats;
50
51/**
52 * Local peer own ID (memory efficient handle).
53 */
54extern GNUNET_PEER_Id myid;
55
56/**
57 * Local peer own ID (full value).
58 */
59extern struct GNUNET_PeerIdentity my_full_id;
60
61
62/**
63 * Don't try to recover tunnels if shutting down.
64 */
65extern int shutting_down;
66
67
68/**
69 * Hello message of local peer.
70 */
71const struct GNUNET_HELLO_Message *mine;
72
73/**
74 * Handle to peerinfo service.
75 */
76static struct GNUNET_PEERINFO_Handle *peerinfo;
77
78/**
79 * Iterator context.
80 */
81struct GNUNET_PEERINFO_NotifyContext* nc;
82
83
84/******************************************************************************/
85/******************************** STATIC ***********************************/
86/******************************************************************************/
87
88/**
89 * Process each hello message received from peerinfo.
90 *
91 * @param cls Closure (unused).
92 * @param peer Identity of the peer.
93 * @param hello Hello of the peer.
94 * @param err_msg Error message.
95 */
96static void
97got_hello (void *cls, const struct GNUNET_PeerIdentity *id,
98 const struct GNUNET_HELLO_Message *hello,
99 const char *err_msg)
100{
101 struct CadetPeer *peer;
102
103 if (NULL == id || NULL == hello)
104 {
105 LOG (GNUNET_ERROR_TYPE_DEBUG, " hello with id %p and msg %p\n", id, hello);
106 return;
107 }
108 LOG (GNUNET_ERROR_TYPE_DEBUG, " hello for %s (%d bytes), expires on %s\n",
109 GNUNET_i2s (id), GNUNET_HELLO_size (hello),
110 GNUNET_STRINGS_absolute_time_to_string (GNUNET_HELLO_get_last_expiration(hello)));
111 peer = GCP_get (id, GNUNET_YES);
112 GCP_set_hello (peer, hello);
113
114 if (GCP_get_short_id (peer) == myid)
115 mine = GCP_get_hello (peer);
116}
117
118
119/******************************************************************************/
120/******************************** API ***********************************/
121/******************************************************************************/
122
123/**
124 * Initialize the hello subsystem.
125 *
126 * @param c Configuration.
127 */
128void
129GCH_init (const struct GNUNET_CONFIGURATION_Handle *c)
130{
131 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
132 GNUNET_assert (NULL == nc);
133 peerinfo = GNUNET_PEERINFO_connect (c);
134 nc = GNUNET_PEERINFO_notify (c, GNUNET_NO, &got_hello, NULL);
135}
136
137
138/**
139 * Shut down the hello subsystem.
140 */
141void
142GCH_shutdown ()
143{
144 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down channels\n");
145 if (NULL != nc)
146 {
147 GNUNET_PEERINFO_notify_cancel (nc);
148 nc = NULL;
149 }
150 if (NULL != peerinfo)
151 {
152 GNUNET_PEERINFO_disconnect (peerinfo);
153 peerinfo = NULL;
154 }
155}
156
157
158/**
159 * Get own hello message.
160 *
161 * @return Own hello message.
162 */
163const struct GNUNET_HELLO_Message *
164GCH_get_mine (void)
165{
166 return mine;
167}
168
169
170/**
171 * Get another peer's hello message.
172 *
173 * @param id ID of the peer whose hello message is requested.
174 *
175 * @return Hello message, if any (NULL possible).
176 */
177const struct GNUNET_HELLO_Message *
178GCH_get (const struct GNUNET_PeerIdentity *id)
179{
180 struct CadetPeer *p;
181
182 p = GCP_get (id, GNUNET_NO);
183 if (NULL == p)
184 return NULL;
185 return GCP_get_hello (p);
186}
187
188
189/**
190 * Convert a hello message to a string.
191 *
192 * @param h Hello message.
193 */
194char *
195GCH_2s (const struct GNUNET_HELLO_Message *h)
196{
197 return "hello (TODO)";
198}
199
200
diff --git a/src/cadet/gnunet-service-cadet_hello.h b/src/cadet/gnunet-service-cadet_hello.h
deleted file mode 100644
index 34121e1e0..000000000
--- a/src/cadet/gnunet-service-cadet_hello.h
+++ /dev/null
@@ -1,79 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2014 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_hello.h
23 * @brief cadet service; dealing with hello messages
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMH (Gnunet Cadet Hello)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_HELLO_H
30#define GNUNET_SERVICE_CADET_HELLO_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42#include "gnunet_hello_lib.h"
43
44
45/**
46 * Initialize the hello subsystem.
47 *
48 * @param c Configuration.
49 */
50void
51GCH_init (const struct GNUNET_CONFIGURATION_Handle *c);
52
53
54/**
55 * Shut down the hello subsystem.
56 */
57void
58GCH_shutdown (void);
59
60
61/**
62 * Get own hello message.
63 *
64 * @return Own hello message.
65 */
66const struct GNUNET_HELLO_Message *
67GCH_get_mine (void);
68
69
70#if 0 /* keep Emacsens' auto-indent happy */
71{
72#endif
73#ifdef __cplusplus
74}
75#endif
76
77/* ifndef GNUNET_CADET_SERVICE_HELLO_H */
78#endif
79/* end of gnunet-cadet-service_hello.h */
diff --git a/src/cadet/gnunet-service-cadet_local.c b/src/cadet/gnunet-service-cadet_local.c
deleted file mode 100644
index dea6681df..000000000
--- a/src/cadet/gnunet-service-cadet_local.c
+++ /dev/null
@@ -1,1553 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21
22#include "platform.h"
23#include "gnunet_util_lib.h"
24
25#include "gnunet_statistics_service.h"
26
27#include "cadet.h"
28#include "cadet_protocol.h" /* GNUNET_CADET_Data is shared */
29
30#include "gnunet-service-cadet_local.h"
31#include "gnunet-service-cadet_channel.h"
32
33/* INFO DEBUG */
34#include "gnunet-service-cadet_tunnel.h"
35#include "gnunet-service-cadet_peer.h"
36
37#define LOG(level, ...) GNUNET_log_from(level,"cadet-loc",__VA_ARGS__)
38
39/******************************************************************************/
40/******************************** STRUCTS **********************************/
41/******************************************************************************/
42
43/**
44 * Struct containing information about a client of the service
45 *
46 * TODO: add a list of 'waiting' ports
47 */
48struct CadetClient
49{
50 /**
51 * Linked list next
52 */
53 struct CadetClient *next;
54
55 /**
56 * Linked list prev
57 */
58 struct CadetClient *prev;
59
60 /**
61 * Tunnels that belong to this client, indexed by local id
62 */
63 struct GNUNET_CONTAINER_MultiHashMap32 *own_channels;
64
65 /**
66 * Tunnels this client has accepted, indexed by incoming local id
67 */
68 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_channels;
69
70 /**
71 * Channel ID for the next incoming channel.
72 */
73 struct GNUNET_CADET_ClientChannelNumber next_ccn;
74
75 /**
76 * Handle to communicate with the client
77 */
78 struct GNUNET_SERVER_Client *handle;
79
80 /**
81 * Ports that this client has declared interest in.
82 * Indexed by port, contains *Client.
83 */
84 struct GNUNET_CONTAINER_MultiHashMap *ports;
85
86 /**
87 * Whether the client is active or shutting down (don't send confirmations
88 * to a client that is shutting down.
89 */
90 int shutting_down;
91
92 /**
93 * ID of the client, mainly for debug messages
94 */
95 unsigned int id;
96};
97
98/******************************************************************************/
99/******************************* GLOBALS ***********************************/
100/******************************************************************************/
101
102/**
103 * Global handle to the statistics service.
104 */
105extern struct GNUNET_STATISTICS_Handle *stats;
106
107/**
108 * Handle to server lib.
109 */
110static struct GNUNET_SERVER_Handle *server_handle;
111
112/**
113 * DLL with all the clients, head.
114 */
115static struct CadetClient *clients_head;
116
117/**
118 * DLL with all the clients, tail.
119 */
120static struct CadetClient *clients_tail;
121
122/**
123 * Next ID to assign to a client.
124 */
125unsigned int next_client_id;
126
127/**
128 * All ports clients of this peer have opened.
129 */
130static struct GNUNET_CONTAINER_MultiHashMap *ports;
131
132/**
133 * Notification context, to send messages to local clients.
134 */
135static struct GNUNET_SERVER_NotificationContext *nc;
136
137
138/******************************************************************************/
139/******************************** STATIC ***********************************/
140/******************************************************************************/
141
142/**
143 * Remove client's ports from the global hashmap on disconnect.
144 *
145 * @param cls Closure (unused).
146 * @param key Port.
147 * @param value Client structure.
148 *
149 * @return #GNUNET_OK, keep iterating.
150 */
151static int
152client_release_ports (void *cls,
153 const struct GNUNET_HashCode *key,
154 void *value)
155{
156 int res;
157
158 res = GNUNET_CONTAINER_multihashmap_remove (ports, key, value);
159 if (GNUNET_YES != res)
160 {
161 GNUNET_break (0);
162 LOG (GNUNET_ERROR_TYPE_WARNING,
163 "Port %s by client %p was not registered.\n",
164 GNUNET_h2s (key), value);
165 }
166 return GNUNET_OK;
167}
168
169
170/**
171 * Iterator for deleting each channel whose client endpoint disconnected.
172 *
173 * @param cls Closure (client that has disconnected).
174 * @param key The local channel id (used to access the hashmap).
175 * @param value The value stored at the key (channel to destroy).
176 *
177 * @return #GNUNET_OK, keep iterating.
178 */
179static int
180channel_destroy_iterator (void *cls,
181 uint32_t key,
182 void *value)
183{
184 struct CadetChannel *ch = value;
185 struct CadetClient *c = cls;
186
187 LOG (GNUNET_ERROR_TYPE_DEBUG,
188 " Channel %s destroy, due to client %s shutdown.\n",
189 GCCH_2s (ch), GML_2s (c));
190
191 GCCH_handle_local_destroy (ch,
192 c,
193 key < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
194 return GNUNET_OK;
195}
196
197
198/**
199 * Unregister data and free memory for a client.
200 *
201 * @param c Client to destroy. No longer valid after call.
202 */
203static void
204client_destroy (struct CadetClient *c)
205{
206 LOG (GNUNET_ERROR_TYPE_DEBUG, " client destroy: %p/%u\n", c, c->id);
207 GNUNET_SERVER_client_drop (c->handle);
208 c->shutting_down = GNUNET_YES;
209
210 if (NULL != c->own_channels)
211 {
212 GNUNET_CONTAINER_multihashmap32_iterate (c->own_channels,
213 &channel_destroy_iterator, c);
214 GNUNET_CONTAINER_multihashmap32_destroy (c->own_channels);
215 }
216 if (NULL != c->incoming_channels)
217 {
218 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_channels,
219 &channel_destroy_iterator, c);
220 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_channels);
221 }
222 if (NULL != c->ports)
223 {
224 GNUNET_CONTAINER_multihashmap_iterate (c->ports,
225 &client_release_ports, c);
226 GNUNET_CONTAINER_multihashmap_destroy (c->ports);
227 }
228
229 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
230 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
231 GNUNET_SERVER_client_set_user_context (c->handle, NULL);
232 GNUNET_free (c);
233}
234
235
236/**
237 * Create a client record, register data and initialize memory.
238 *
239 * @param client Client's handle.
240 */
241static struct CadetClient *
242client_new (struct GNUNET_SERVER_Client *client)
243{
244 struct CadetClient *c;
245
246 GNUNET_SERVER_client_keep (client);
247 GNUNET_SERVER_notification_context_add (nc, client);
248
249 c = GNUNET_new (struct CadetClient);
250 c->handle = client;
251 c->id = next_client_id++; /* overflow not important: just for debug */
252
253 c->own_channels = GNUNET_CONTAINER_multihashmap32_create (32);
254 c->incoming_channels = GNUNET_CONTAINER_multihashmap32_create (32);
255
256 GNUNET_SERVER_client_set_user_context (client, c);
257 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
258 GNUNET_STATISTICS_update (stats, "# clients", +1, GNUNET_NO);
259
260 LOG (GNUNET_ERROR_TYPE_DEBUG, " client created: %p/%u\n", c, c->id);
261
262 return c;
263}
264
265
266/******************************************************************************/
267/******************************** HANDLES ***********************************/
268/******************************************************************************/
269
270/**
271 * Handler for client connection.
272 *
273 * @param cls Closure (unused).
274 * @param client Client handler.
275 */
276static void
277handle_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
278{
279 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client connected: %p\n", client);
280 if (NULL == client)
281 return;
282
283 (void) client_new (client);
284}
285
286
287/**
288 * Handler for client disconnection
289 *
290 * @param cls closure
291 * @param client identification of the client; NULL
292 * for the last call when the server is destroyed
293 */
294static void
295handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
296{
297 struct CadetClient *c;
298
299 LOG (GNUNET_ERROR_TYPE_DEBUG, "Client disconnected: %p\n", client);
300
301 c = GML_client_get (client);
302 if (NULL != c)
303 {
304 LOG (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
305 c->id, c);
306 client_destroy (c);
307 }
308 else
309 {
310 LOG (GNUNET_ERROR_TYPE_DEBUG, " disconnecting client's context NULL\n");
311 }
312 return;
313}
314
315
316/**
317 * Handler for port open requests.
318 *
319 * @param cls Closure.
320 * @param client Identification of the client.
321 * @param message The actual message.
322 */
323static void
324handle_port_open (void *cls, struct GNUNET_SERVER_Client *client,
325 const struct GNUNET_MessageHeader *message)
326{
327 struct CadetClient *c;
328 struct GNUNET_CADET_PortMessage *pmsg;
329
330 LOG (GNUNET_ERROR_TYPE_DEBUG, "open port requested\n");
331
332 /* Sanity check for client registration */
333 if (NULL == (c = GML_client_get (client)))
334 {
335 GNUNET_break (0);
336 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
337 return;
338 }
339 LOG (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
340
341 /* Message size sanity check */
342 if (sizeof (struct GNUNET_CADET_PortMessage) != ntohs (message->size))
343 {
344 GNUNET_break (0);
345 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
346 return;
347 }
348
349 pmsg = (struct GNUNET_CADET_PortMessage *) message;
350 if (NULL == c->ports)
351 {
352 c->ports = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
353 }
354 /* store in client's hashmap */
355 if (GNUNET_OK !=
356 GNUNET_CONTAINER_multihashmap_put (c->ports, &pmsg->port, c,
357 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
358 {
359 GNUNET_break (0);
360 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
361 return;
362 }
363 /* store in global hashmap */
364 /* FIXME only allow one client to have the port open,
365 * have a backup hashmap with waiting clients */
366 GNUNET_CONTAINER_multihashmap_put (ports, &pmsg->port, c,
367 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
368
369 GNUNET_SERVER_receive_done (client, GNUNET_OK);
370}
371
372
373/**
374 * Handler for port close requests.
375 *
376 * @param cls Closure.
377 * @param client Identification of the client.
378 * @param message The actual message.
379 */
380static void
381handle_port_close (void *cls, struct GNUNET_SERVER_Client *client,
382 const struct GNUNET_MessageHeader *message)
383{
384 struct CadetClient *c;
385 struct GNUNET_CADET_PortMessage *pmsg;
386 int removed;
387
388 LOG (GNUNET_ERROR_TYPE_DEBUG, "close port requested\n");
389
390 /* Sanity check for client registration */
391 if (NULL == (c = GML_client_get (client)))
392 {
393 GNUNET_break (0);
394 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
395 return;
396 }
397 LOG (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
398
399 /* Message size sanity check */
400 if (sizeof (struct GNUNET_CADET_PortMessage) != ntohs (message->size))
401 {
402 GNUNET_break (0);
403 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
404 return;
405 }
406
407 pmsg = (struct GNUNET_CADET_PortMessage *) message;
408 removed = GNUNET_CONTAINER_multihashmap_remove (c->ports, &pmsg->port, c);
409 GNUNET_break_op (GNUNET_YES == removed);
410 removed = GNUNET_CONTAINER_multihashmap_remove (ports, &pmsg->port, c);
411 GNUNET_break_op (GNUNET_YES == removed);
412
413 GNUNET_SERVER_receive_done (client, GNUNET_OK);
414}
415
416
417/**
418 * Handler for requests of new channels.
419 *
420 * @param cls Closure.
421 * @param client Identification of the client.
422 * @param message The actual message.
423 */
424static void
425handle_channel_create (void *cls, struct GNUNET_SERVER_Client *client,
426 const struct GNUNET_MessageHeader *message)
427{
428 struct CadetClient *c;
429
430 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
431 LOG (GNUNET_ERROR_TYPE_DEBUG, "new channel requested\n");
432
433 /* Sanity check for client registration */
434 if (NULL == (c = GML_client_get (client)))
435 {
436 GNUNET_break (0);
437 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
438 return;
439 }
440 LOG (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
441
442 /* Message size sanity check */
443 if (sizeof (struct GNUNET_CADET_LocalChannelCreateMessage)
444 != ntohs (message->size))
445 {
446 GNUNET_break (0);
447 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
448 return;
449 }
450
451 if (GNUNET_OK !=
452 GCCH_handle_local_create (c,
453 (struct GNUNET_CADET_LocalChannelCreateMessage *)
454 message))
455 {
456 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
457 return;
458 }
459
460 GNUNET_SERVER_receive_done (client, GNUNET_OK);
461}
462
463
464/**
465 * Handler for requests of deleting tunnels
466 *
467 * @param cls closure
468 * @param client identification of the client
469 * @param message the actual message
470 */
471static void
472handle_channel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
473 const struct GNUNET_MessageHeader *message)
474{
475 const struct GNUNET_CADET_LocalChannelDestroyMessage *msg;
476 struct CadetClient *c;
477 struct CadetChannel *ch;
478 struct GNUNET_CADET_ClientChannelNumber ccn;
479
480 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a DESTROY CHANNEL from client!\n");
481
482 /* Sanity check for client registration */
483 if (NULL == (c = GML_client_get (client)))
484 {
485 GNUNET_break (0);
486 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
487 return;
488 }
489 LOG (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
490
491 /* Message sanity check */
492 if (sizeof (struct GNUNET_CADET_LocalChannelDestroyMessage)
493 != ntohs (message->size))
494 {
495 GNUNET_break (0);
496 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
497 return;
498 }
499
500 msg = (const struct GNUNET_CADET_LocalChannelDestroyMessage *) message;
501
502 /* Retrieve tunnel */
503 ccn = msg->ccn;
504 ch = GML_channel_get (c, ccn);
505
506 LOG (GNUNET_ERROR_TYPE_INFO, "Client %u is destroying channel %X\n",
507 c->id, ccn);
508
509 if (NULL == ch)
510 {
511 LOG (GNUNET_ERROR_TYPE_WARNING, " channel %X not found\n", ccn);
512 GNUNET_STATISTICS_update (stats,
513 "# client destroy messages on unknown channel",
514 1, GNUNET_NO);
515 GNUNET_SERVER_receive_done (client, GNUNET_OK);
516 return;
517 }
518
519 GCCH_handle_local_destroy (ch,
520 c,
521 ntohl (ccn.channel_of_client) < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
522
523 GNUNET_SERVER_receive_done (client, GNUNET_OK);
524}
525
526
527/**
528 * Handler for client traffic
529 *
530 * @param cls closure
531 * @param client identification of the client
532 * @param message the actual message
533 */
534static void
535handle_data (void *cls, struct GNUNET_SERVER_Client *client,
536 const struct GNUNET_MessageHeader *message)
537{
538 const struct GNUNET_MessageHeader *payload;
539 struct GNUNET_CADET_LocalData *msg;
540 struct CadetClient *c;
541 struct CadetChannel *ch;
542 struct GNUNET_CADET_ClientChannelNumber ccn;
543 size_t message_size;
544 size_t payload_size;
545 size_t payload_claimed_size;
546 int fwd;
547
548 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
549 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
550 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got data from a client\n");
551
552 /* Sanity check for client registration */
553 if (NULL == (c = GML_client_get (client)))
554 {
555 GNUNET_break (0);
556 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
557 return;
558 }
559
560 /* Sanity check for message size */
561 message_size = ntohs (message->size);
562 if (sizeof (struct GNUNET_CADET_LocalData)
563 + sizeof (struct GNUNET_MessageHeader) > message_size
564 || GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < message_size)
565 {
566 GNUNET_break (0);
567 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
568 return;
569 }
570
571 /* Sanity check for payload size */
572 payload_size = message_size - sizeof (struct GNUNET_CADET_LocalData);
573 msg = (struct GNUNET_CADET_LocalData *) message;
574 payload = (struct GNUNET_MessageHeader *) &msg[1];
575 payload_claimed_size = ntohs (payload->size);
576 if (sizeof (struct GNUNET_MessageHeader) > payload_claimed_size
577 || GNUNET_CONSTANTS_MAX_CADET_MESSAGE_SIZE < payload_claimed_size
578 || payload_claimed_size > payload_size)
579 {
580 LOG (GNUNET_ERROR_TYPE_WARNING,
581 "client claims to send %u bytes in %u payload\n",
582 payload_claimed_size, payload_size);
583 GNUNET_break (0);
584 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
585 return;
586 }
587
588 ccn = msg->ccn;
589 LOG (GNUNET_ERROR_TYPE_DEBUG, " %u bytes (%u payload) by client %u\n",
590 payload_size, payload_claimed_size, c->id);
591
592 /* Channel exists? */
593 fwd = ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
594 ch = GML_channel_get (c, ccn);
595 if (NULL == ch)
596 {
597 GNUNET_STATISTICS_update (stats,
598 "# client data messages on unknown channel",
599 1, GNUNET_NO);
600 GNUNET_SERVER_receive_done (client, GNUNET_OK);
601 return;
602 }
603
604 if (GNUNET_OK != GCCH_handle_local_data (ch, c, fwd, payload, payload_size))
605 {
606 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
607 return;
608 }
609
610 LOG (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
611 GNUNET_SERVER_receive_done (client, GNUNET_OK);
612
613 return;
614}
615
616
617/**
618 * Handler for client's ACKs for payload traffic.
619 *
620 * @param cls Closure (unused).
621 * @param client Identification of the client.
622 * @param message The actual message.
623 */
624static void
625handle_ack (void *cls, struct GNUNET_SERVER_Client *client,
626 const struct GNUNET_MessageHeader *message)
627{
628 struct GNUNET_CADET_LocalAck *msg;
629 struct CadetChannel *ch;
630 struct CadetClient *c;
631 struct GNUNET_CADET_ClientChannelNumber ccn;
632 int fwd;
633
634 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
635 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
636
637 /* Sanity check for client registration */
638 if (NULL == (c = GML_client_get (client)))
639 {
640 GNUNET_break (0);
641 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
642 return;
643 }
644 LOG (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
645
646 msg = (struct GNUNET_CADET_LocalAck *) message;
647
648 /* Channel exists? */
649 ccn = msg->ccn;
650 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n",
651 ntohl (ccn.channel_of_client));
652 ch = GML_channel_get (c, ccn);
653 LOG (GNUNET_ERROR_TYPE_DEBUG, " -- ch %p\n", ch);
654 if (NULL == ch)
655 {
656 LOG (GNUNET_ERROR_TYPE_DEBUG,
657 "Channel %X unknown.\n",
658 ntohl (ccn.channel_of_client));
659 LOG (GNUNET_ERROR_TYPE_DEBUG, " for client %u.\n", c->id);
660 GNUNET_STATISTICS_update (stats,
661 "# client ack messages on unknown channel",
662 1, GNUNET_NO);
663 GNUNET_SERVER_receive_done (client, GNUNET_OK);
664 return;
665 }
666
667 /* If client is root, the ACK is going FWD, therefore this is "BCK ACK". */
668 /* If client is dest, the ACK is going BCK, therefore this is "FWD ACK" */
669 fwd = ntohl (ccn.channel_of_client) < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
670
671 GCCH_handle_local_ack (ch, fwd);
672 GNUNET_SERVER_receive_done (client, GNUNET_OK);
673}
674
675
676/**
677 * Iterator over all peers to send a monitoring client info about each peer.
678 *
679 * @param cls Closure ().
680 * @param peer Peer ID (tunnel remote peer).
681 * @param value Peer info.
682 *
683 * @return #GNUNET_YES, to keep iterating.
684 */
685static int
686get_all_peers_iterator (void *cls,
687 const struct GNUNET_PeerIdentity * peer,
688 void *value)
689{
690 struct GNUNET_SERVER_Client *client = cls;
691 struct CadetPeer *p = value;
692 struct GNUNET_CADET_LocalInfoPeer msg;
693
694 msg.header.size = htons (sizeof (msg));
695 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
696 msg.destination = *peer;
697 msg.paths = htons (GCP_count_paths (p));
698 msg.tunnel = htons (NULL != GCP_get_tunnel (p));
699
700 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending info about peer %s\n",
701 GNUNET_i2s (peer));
702
703 GNUNET_SERVER_notification_context_unicast (nc, client,
704 &msg.header, GNUNET_NO);
705 return GNUNET_YES;
706}
707
708
709/**
710 * Iterator over all peers to dump info for each peer.
711 *
712 * @param cls Closure (unused).
713 * @param peer Peer ID (tunnel remote peer).
714 * @param value Peer info.
715 *
716 * @return #GNUNET_YES, to keep iterating.
717 */
718static int
719show_peer_iterator (void *cls,
720 const struct GNUNET_PeerIdentity * peer,
721 void *value)
722{
723 struct CadetPeer *p = value;
724 struct CadetTunnel *t;
725
726 t = GCP_get_tunnel (p);
727 if (NULL != t)
728 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
729
730 LOG (GNUNET_ERROR_TYPE_ERROR, "\n");
731
732 return GNUNET_YES;
733}
734
735
736/**
737 * Iterator over all paths of a peer to build an InfoPeer message.
738 *
739 * Message contains blocks of peers, first not included.
740 *
741 * @param cls Closure (message to build).
742 * @param peer Peer this path is towards.
743 * @param path Path itself
744 * @return #GNUNET_YES if should keep iterating.
745 * #GNUNET_NO otherwise.
746 */
747static int
748path_info_iterator (void *cls,
749 struct CadetPeer *peer,
750 struct CadetPeerPath *path)
751{
752 struct GNUNET_CADET_LocalInfoPeer *resp = cls;
753 struct GNUNET_PeerIdentity *id;
754 uint16_t msg_size;
755 uint16_t path_size;
756 unsigned int i;
757
758 msg_size = ntohs (resp->header.size);
759 path_size = sizeof (struct GNUNET_PeerIdentity) * (path->length - 1);
760
761 LOG (GNUNET_ERROR_TYPE_DEBUG, "Info Path %u\n", path->length);
762 if (msg_size + path_size > UINT16_MAX)
763 {
764 LOG (GNUNET_ERROR_TYPE_WARNING, "path too long for info message\n");
765 return GNUNET_NO;
766 }
767
768 i = msg_size - sizeof (struct GNUNET_CADET_LocalInfoPeer);
769 i = i / sizeof (struct GNUNET_PeerIdentity);
770
771 /* Set id to the address of the first free peer slot. */
772 id = (struct GNUNET_PeerIdentity *) &resp[1];
773 id = &id[i];
774
775 /* Don't copy first peers.
776 * First peer is always the local one.
777 * Last peer is always the destination (leave as 0, EOL).
778 */
779 for (i = 0; i < path->length - 1; i++)
780 {
781 GNUNET_PEER_resolve (path->peers[i + 1], &id[i]);
782 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s\n", GNUNET_i2s (&id[i]));
783 }
784
785 resp->header.size = htons (msg_size + path_size);
786
787 return GNUNET_YES;
788}
789
790
791/**
792 * Handler for client's INFO PEERS request.
793 *
794 * @param cls Closure (unused).
795 * @param client Identification of the client.
796 * @param message The actual message.
797 */
798static void
799handle_get_peers (void *cls, struct GNUNET_SERVER_Client *client,
800 const struct GNUNET_MessageHeader *message)
801{
802 struct CadetClient *c;
803 struct GNUNET_MessageHeader reply;
804
805 /* Sanity check for client registration */
806 if (NULL == (c = GML_client_get (client)))
807 {
808 GNUNET_break (0);
809 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
810 return;
811 }
812
813 LOG (GNUNET_ERROR_TYPE_DEBUG,
814 "Received get peers request from client %u (%p)\n",
815 c->id, client);
816
817 GCP_iterate_all (get_all_peers_iterator, client);
818 reply.size = htons (sizeof (reply));
819 reply.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
820 GNUNET_SERVER_notification_context_unicast (nc, client, &reply, GNUNET_NO);
821
822 LOG (GNUNET_ERROR_TYPE_DEBUG,
823 "Get peers request from client %u completed\n", c->id);
824 GNUNET_SERVER_receive_done (client, GNUNET_OK);
825}
826
827
828/**
829 * Handler for client's SHOW_PEER request.
830 *
831 * @param cls Closure (unused).
832 * @param client Identification of the client.
833 * @param message The actual message.
834 */
835void
836handle_show_peer (void *cls, struct GNUNET_SERVER_Client *client,
837 const struct GNUNET_MessageHeader *message)
838{
839 const struct GNUNET_CADET_LocalInfo *msg;
840 struct GNUNET_CADET_LocalInfoPeer *resp;
841 struct CadetPeer *p;
842 struct CadetClient *c;
843 unsigned char cbuf[64 * 1024];
844
845 /* Sanity check for client registration */
846 if (NULL == (c = GML_client_get (client)))
847 {
848 GNUNET_break (0);
849 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
850 return;
851 }
852
853 msg = (struct GNUNET_CADET_LocalInfo *) message;
854 resp = (struct GNUNET_CADET_LocalInfoPeer *) cbuf;
855 LOG (GNUNET_ERROR_TYPE_INFO,
856 "Received peer info request from client %u for peer %s\n",
857 c->id, GNUNET_i2s_full (&msg->peer));
858
859 resp->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER);
860 resp->header.size = htons (sizeof (struct GNUNET_CADET_LocalInfoPeer));
861 resp->destination = msg->peer;
862 p = GCP_get (&msg->peer, GNUNET_NO);
863 if (NULL == p)
864 {
865 /* We don't know the peer */
866
867 LOG (GNUNET_ERROR_TYPE_INFO, "Peer %s unknown\n",
868 GNUNET_i2s_full (&msg->peer));
869 resp->paths = htons (0);
870 resp->tunnel = htons (NULL != GCP_get_tunnel (p));
871
872 GNUNET_SERVER_notification_context_unicast (nc, client,
873 &resp->header,
874 GNUNET_NO);
875 GNUNET_SERVER_receive_done (client, GNUNET_OK);
876 return;
877 }
878
879 resp->paths = htons (GCP_count_paths (p));
880 resp->tunnel = htons (NULL != GCP_get_tunnel (p));
881 GCP_iterate_paths (p, &path_info_iterator, resp);
882
883 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
884 &resp->header, GNUNET_NO);
885
886 LOG (GNUNET_ERROR_TYPE_INFO, "Show peer from client %u completed.\n", c->id);
887 GNUNET_SERVER_receive_done (client, GNUNET_OK);
888}
889
890
891/**
892 * Iterator over all tunnels to send a monitoring client info about each tunnel.
893 *
894 * @param cls Closure ().
895 * @param peer Peer ID (tunnel remote peer).
896 * @param value Tunnel info.
897 *
898 * @return #GNUNET_YES, to keep iterating.
899 */
900static int
901get_all_tunnels_iterator (void *cls,
902 const struct GNUNET_PeerIdentity * peer,
903 void *value)
904{
905 struct GNUNET_SERVER_Client *client = cls;
906 struct CadetTunnel *t = value;
907 struct GNUNET_CADET_LocalInfoTunnel msg;
908
909 msg.header.size = htons (sizeof (msg));
910 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
911 msg.destination = *peer;
912 msg.channels = htonl (GCT_count_channels (t));
913 msg.connections = htonl (GCT_count_any_connections (t));
914 msg.cstate = htons ((uint16_t) GCT_get_cstate (t));
915 msg.estate = htons ((uint16_t) GCT_get_estate (t));
916
917 LOG (GNUNET_ERROR_TYPE_DEBUG, "sending info about tunnel ->%s\n",
918 GNUNET_i2s (peer));
919
920 GNUNET_SERVER_notification_context_unicast (nc, client,
921 &msg.header, GNUNET_NO);
922 return GNUNET_YES;
923}
924
925
926/**
927 * Handler for client's INFO TUNNELS request.
928 *
929 * @param cls Closure (unused).
930 * @param client Identification of the client.
931 * @param message The actual message.
932 */
933static void
934handle_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
935 const struct GNUNET_MessageHeader *message)
936{
937 struct CadetClient *c;
938 struct GNUNET_MessageHeader reply;
939
940 /* Sanity check for client registration */
941 if (NULL == (c = GML_client_get (client)))
942 {
943 GNUNET_break (0);
944 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
945 return;
946 }
947
948 LOG (GNUNET_ERROR_TYPE_DEBUG,
949 "Received get tunnels request from client %u (%p)\n",
950 c->id, client);
951
952 GCT_iterate_all (get_all_tunnels_iterator, client);
953 reply.size = htons (sizeof (reply));
954 reply.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
955 GNUNET_SERVER_notification_context_unicast (nc, client, &reply, GNUNET_NO);
956
957 LOG (GNUNET_ERROR_TYPE_DEBUG,
958 "Get tunnels request from client %u completed\n", c->id);
959 GNUNET_SERVER_receive_done (client, GNUNET_OK);
960}
961
962
963static void
964iter_connection (void *cls, struct CadetConnection *c)
965{
966 struct GNUNET_CADET_LocalInfoTunnel *msg = cls;
967 struct GNUNET_CADET_ConnectionTunnelIdentifier *h;
968
969 h = (struct GNUNET_CADET_ConnectionTunnelIdentifier *) &msg[1];
970 h[msg->connections] = *(GCC_get_id (c));
971 msg->connections++;
972}
973
974static void
975iter_channel (void *cls, struct CadetChannel *ch)
976{
977 struct GNUNET_CADET_LocalInfoTunnel *msg = cls;
978 struct GNUNET_CADET_ConnectionTunnelIdentifier *h = (struct GNUNET_CADET_ConnectionTunnelIdentifier *) &msg[1];
979 struct GNUNET_CADET_ChannelTunnelNumber *chn = (struct GNUNET_CADET_ChannelTunnelNumber *) &h[msg->connections];
980
981 chn[msg->channels] = GCCH_get_id (ch);
982 msg->channels++;
983}
984
985
986/**
987 * Handler for client's SHOW_TUNNEL request.
988 *
989 * @param cls Closure (unused).
990 * @param client Identification of the client.
991 * @param message The actual message.
992 */
993void
994handle_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
995 const struct GNUNET_MessageHeader *message)
996{
997 const struct GNUNET_CADET_LocalInfo *msg;
998 struct GNUNET_CADET_LocalInfoTunnel *resp;
999 struct CadetClient *c;
1000 struct CadetTunnel *t;
1001 unsigned int ch_n;
1002 unsigned int c_n;
1003 size_t size;
1004
1005 /* Sanity check for client registration */
1006 if (NULL == (c = GML_client_get (client)))
1007 {
1008 GNUNET_break (0);
1009 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1010 return;
1011 }
1012
1013 msg = (struct GNUNET_CADET_LocalInfo *) message;
1014 LOG (GNUNET_ERROR_TYPE_DEBUG,
1015 "Received tunnel info request from client %u for tunnel %s\n",
1016 c->id, GNUNET_i2s_full(&msg->peer));
1017
1018 t = GCP_get_tunnel (GCP_get (&msg->peer, GNUNET_NO));
1019 if (NULL == t)
1020 {
1021 /* We don't know the tunnel */
1022 struct GNUNET_CADET_LocalInfoTunnel warn;
1023
1024 LOG (GNUNET_ERROR_TYPE_INFO, "Tunnel %s unknown %u\n",
1025 GNUNET_i2s_full(&msg->peer), sizeof (warn));
1026 warn.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
1027 warn.header.size = htons (sizeof (warn));
1028 warn.destination = msg->peer;
1029 warn.channels = htonl (0);
1030 warn.connections = htonl (0);
1031 warn.cstate = htons (0);
1032 warn.estate = htons (0);
1033
1034 GNUNET_SERVER_notification_context_unicast (nc, client,
1035 &warn.header,
1036 GNUNET_NO);
1037 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1038 return;
1039 }
1040
1041 /* Initialize context */
1042 ch_n = GCT_count_channels (t);
1043 c_n = GCT_count_any_connections (t);
1044
1045 size = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
1046 size += c_n * sizeof (struct GNUNET_CADET_ConnectionTunnelIdentifier);
1047 size += ch_n * sizeof (struct GNUNET_CADET_ChannelTunnelNumber);
1048
1049 resp = GNUNET_malloc (size);
1050 resp->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
1051 resp->header.size = htons (size);
1052 resp->destination = msg->peer;
1053 /* Do not interleave with iterators, iter_channel needs conn in HBO */
1054 GCT_iterate_connections (t, &iter_connection, resp);
1055 GCT_iterate_channels (t, &iter_channel, resp);
1056 resp->connections = htonl (resp->connections);
1057 resp->channels = htonl (resp->channels);
1058 /* Do not interleave end */
1059 resp->cstate = htons (GCT_get_cstate (t));
1060 resp->estate = htons (GCT_get_estate (t));
1061 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1062 &resp->header, GNUNET_NO);
1063 GNUNET_free (resp);
1064
1065 LOG (GNUNET_ERROR_TYPE_DEBUG,
1066 "Show tunnel request from client %u completed. %u conn, %u ch\n",
1067 c->id, c_n, ch_n);
1068 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1069}
1070
1071
1072/**
1073 * Handler for client's INFO_DUMP request.
1074 *
1075 * @param cls Closure (unused).
1076 * @param client Identification of the client.
1077 * @param message The actual message.
1078 */
1079void
1080handle_info_dump (void *cls, struct GNUNET_SERVER_Client *client,
1081 const struct GNUNET_MessageHeader *message)
1082{
1083 struct CadetClient *c;
1084
1085 /* Sanity check for client registration */
1086 if (NULL == (c = GML_client_get (client)))
1087 {
1088 GNUNET_break (0);
1089 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1090 return;
1091 }
1092
1093 LOG (GNUNET_ERROR_TYPE_INFO, "Received dump info request from client %u\n",
1094 c->id);
1095 LOG (GNUNET_ERROR_TYPE_ERROR,
1096 "*************************** DUMP START ***************************\n");
1097
1098 for (c = clients_head; NULL != c; c = c->next)
1099 {
1100 LOG (GNUNET_ERROR_TYPE_ERROR, "Client %u (%p), handle: %p\n",
1101 c->id, c, c->handle);
1102 if (NULL != c->ports)
1103 LOG (GNUNET_ERROR_TYPE_ERROR, "\t%3u ports registered\n",
1104 GNUNET_CONTAINER_multihashmap_size (c->ports));
1105 else
1106 LOG (GNUNET_ERROR_TYPE_ERROR, "\t no ports registered\n");
1107 LOG (GNUNET_ERROR_TYPE_ERROR, "\t%3u own channles\n",
1108 GNUNET_CONTAINER_multihashmap32_size (c->own_channels));
1109 LOG (GNUNET_ERROR_TYPE_ERROR, "\t%3u incoming channles\n",
1110 GNUNET_CONTAINER_multihashmap32_size (c->incoming_channels));
1111 }
1112 LOG (GNUNET_ERROR_TYPE_ERROR, "***************************\n");
1113 GCP_iterate_all (&show_peer_iterator, NULL);
1114
1115 LOG (GNUNET_ERROR_TYPE_ERROR,
1116 "**************************** DUMP END ****************************\n");
1117
1118 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1119}
1120
1121
1122/**
1123 * Functions to handle messages from clients
1124 */
1125static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
1126 {&handle_port_open, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_OPEN,
1127 sizeof (struct GNUNET_CADET_PortMessage)},
1128 {&handle_port_close, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_PORT_CLOSE,
1129 sizeof (struct GNUNET_CADET_PortMessage)},
1130 {&handle_channel_create, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE,
1131 sizeof (struct GNUNET_CADET_LocalChannelCreateMessage)},
1132 {&handle_channel_destroy, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY,
1133 sizeof (struct GNUNET_CADET_LocalChannelDestroyMessage)},
1134 {&handle_data, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA, 0},
1135 {&handle_ack, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK,
1136 sizeof (struct GNUNET_CADET_LocalAck)},
1137 {&handle_get_peers, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS,
1138 sizeof (struct GNUNET_MessageHeader)},
1139 {&handle_show_peer, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER,
1140 sizeof (struct GNUNET_CADET_LocalInfo)},
1141 {&handle_get_tunnels, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS,
1142 sizeof (struct GNUNET_MessageHeader)},
1143 {&handle_show_tunnel, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL,
1144 sizeof (struct GNUNET_CADET_LocalInfo)},
1145 {&handle_info_dump, NULL, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_DUMP,
1146 sizeof (struct GNUNET_MessageHeader)},
1147 {NULL, NULL, 0, 0}
1148};
1149
1150
1151
1152/******************************************************************************/
1153/******************************** API ***********************************/
1154/******************************************************************************/
1155
1156/**
1157 * Initialize server subsystem.
1158 *
1159 * @param handle Server handle.
1160 */
1161void
1162GML_init (struct GNUNET_SERVER_Handle *handle)
1163{
1164 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
1165 server_handle = handle;
1166 GNUNET_SERVER_suspend (server_handle);
1167 ports = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
1168}
1169
1170
1171/**
1172 * Install server (service) handlers and start listening to clients.
1173 */
1174void
1175GML_start (void)
1176{
1177 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
1178 GNUNET_SERVER_connect_notify (server_handle, &handle_client_connect, NULL);
1179 GNUNET_SERVER_disconnect_notify (server_handle, &handle_client_disconnect,
1180 NULL);
1181 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
1182
1183 clients_head = NULL;
1184 clients_tail = NULL;
1185 next_client_id = 0;
1186 GNUNET_SERVER_resume (server_handle);
1187}
1188
1189
1190/**
1191 * Shutdown server.
1192 */
1193void
1194GML_shutdown (void)
1195{
1196 struct CadetClient *c;
1197
1198 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down local\n");
1199
1200 for (c = clients_head; NULL != clients_head; c = clients_head)
1201 client_destroy (c);
1202
1203 if (nc != NULL)
1204 {
1205 GNUNET_SERVER_notification_context_destroy (nc);
1206 nc = NULL;
1207 }
1208
1209}
1210
1211
1212/**
1213 * Get a channel from a client.
1214 *
1215 * @param c Client to check.
1216 * @param ccn Channel ID, must be local (> 0x800...).
1217 *
1218 * @return non-NULL if channel exists in the clients lists
1219 */
1220struct CadetChannel *
1221GML_channel_get (struct CadetClient *c,
1222 struct GNUNET_CADET_ClientChannelNumber ccn)
1223{
1224 struct GNUNET_CONTAINER_MultiHashMap32 *map;
1225
1226 if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1227 map = c->own_channels;
1228 else
1229 map = c->incoming_channels;
1230
1231 if (NULL == map)
1232 {
1233 GNUNET_break (0);
1234 LOG (GNUNET_ERROR_TYPE_DEBUG,
1235 "Client %s does no t have a valid map for CCN %X\n",
1236 GML_2s (c), ccn);
1237 return NULL;
1238 }
1239 return GNUNET_CONTAINER_multihashmap32_get (map,
1240 ccn.channel_of_client);
1241}
1242
1243
1244/**
1245 * Add a channel to a client
1246 *
1247 * @param client Client.
1248 * @param ccn Channel ID.
1249 * @param ch Channel.
1250 */
1251void
1252GML_channel_add (struct CadetClient *client,
1253 struct GNUNET_CADET_ClientChannelNumber ccn,
1254 struct CadetChannel *ch)
1255{
1256 if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1257 GNUNET_CONTAINER_multihashmap32_put (client->own_channels,
1258 ccn.channel_of_client,
1259 ch,
1260 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1261 else
1262 GNUNET_CONTAINER_multihashmap32_put (client->incoming_channels,
1263 ccn.channel_of_client,
1264 ch,
1265 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1266}
1267
1268
1269/**
1270 * Remove a channel from a client.
1271 *
1272 * @param client Client.
1273 * @param ccn Channel ID.
1274 * @param ch Channel.
1275 */
1276void
1277GML_channel_remove (struct CadetClient *client,
1278 struct GNUNET_CADET_ClientChannelNumber ccn,
1279 struct CadetChannel *ch)
1280{
1281 if (ntohl (ccn.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1282 GNUNET_CONTAINER_multihashmap32_remove (client->own_channels,
1283 ccn.channel_of_client,
1284 ch);
1285 else
1286 GNUNET_CONTAINER_multihashmap32_remove (client->incoming_channels,
1287 ccn.channel_of_client,
1288 ch);
1289}
1290
1291
1292/**
1293 * Get the tunnel's next free local channel ID.
1294 *
1295 * @param c Client.
1296 *
1297 * @return LID of a channel free to use.
1298 */
1299struct GNUNET_CADET_ClientChannelNumber
1300GML_get_next_ccn (struct CadetClient *c)
1301{
1302 struct GNUNET_CADET_ClientChannelNumber ccn;
1303
1304 while (NULL != GML_channel_get (c,
1305 c->next_ccn))
1306 {
1307 LOG (GNUNET_ERROR_TYPE_DEBUG,
1308 "Channel %u exists...\n",
1309 c->next_ccn);
1310 c->next_ccn.channel_of_client
1311 = htonl (1 + (ntohl (c->next_ccn.channel_of_client)));
1312 if (ntohl (c->next_ccn.channel_of_client) >=
1313 GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1314 c->next_ccn.channel_of_client = htonl (0);
1315 }
1316 ccn = c->next_ccn;
1317 c->next_ccn.channel_of_client
1318 = htonl (1 + (ntohl (c->next_ccn.channel_of_client)));
1319
1320 return ccn;
1321}
1322
1323
1324/**
1325 * Check if client has registered with the service and has not disconnected
1326 *
1327 * @param client the client to check
1328 *
1329 * @return non-NULL if client exists in the global DLL
1330 */
1331struct CadetClient *
1332GML_client_get (struct GNUNET_SERVER_Client *client)
1333{
1334 if (NULL == client)
1335 return NULL;
1336 return GNUNET_SERVER_client_get_user_context (client,
1337 struct CadetClient);
1338}
1339
1340
1341/**
1342 * Find a client that has opened a port
1343 *
1344 * @param port Port to check.
1345 *
1346 * @return non-NULL if a client has the port.
1347 */
1348struct CadetClient *
1349GML_client_get_by_port (const struct GNUNET_HashCode *port)
1350{
1351 return GNUNET_CONTAINER_multihashmap_get (ports, port);
1352}
1353
1354
1355/**
1356 * Deletes a channel from a client (either owner or destination).
1357 *
1358 * @param c Client whose tunnel to delete.
1359 * @param ch Channel which should be deleted.
1360 * @param id Channel ID.
1361 */
1362void
1363GML_client_delete_channel (struct CadetClient *c,
1364 struct CadetChannel *ch,
1365 struct GNUNET_CADET_ClientChannelNumber id)
1366{
1367 int res;
1368
1369 if (ntohl (id.channel_of_client) >= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI)
1370 {
1371 res = GNUNET_CONTAINER_multihashmap32_remove (c->own_channels,
1372 id.channel_of_client,
1373 ch);
1374 if (GNUNET_YES != res)
1375 LOG (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel root KO\n");
1376 }
1377 else
1378 {
1379 res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_channels,
1380 id.channel_of_client,
1381 ch);
1382 if (GNUNET_YES != res)
1383 LOG (GNUNET_ERROR_TYPE_DEBUG, "client_delete_channel dest KO\n");
1384 }
1385}
1386
1387/**
1388 * Build a local ACK message and send it to a local client, if needed.
1389 *
1390 * If the client was already allowed to send data, do nothing.
1391 *
1392 * @param c Client to whom send the ACK.
1393 * @param ccn Channel ID to use
1394 */
1395void
1396GML_send_ack (struct CadetClient *c,
1397 struct GNUNET_CADET_ClientChannelNumber ccn)
1398{
1399 struct GNUNET_CADET_LocalAck msg;
1400
1401 LOG (GNUNET_ERROR_TYPE_DEBUG,
1402 "send local %s ack on %X towards %p\n",
1403 ntohl (ccn.channel_of_client) < GNUNET_CADET_LOCAL_CHANNEL_ID_CLI
1404 ? "FWD" : "BCK",
1405 ntohl (ccn.channel_of_client),
1406 c);
1407
1408 msg.header.size = htons (sizeof (msg));
1409 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK);
1410 msg.ccn = ccn;
1411 GNUNET_SERVER_notification_context_unicast (nc,
1412 c->handle,
1413 &msg.header,
1414 GNUNET_NO);
1415
1416}
1417
1418
1419
1420/**
1421 * Notify the client that a new incoming channel was created.
1422 *
1423 * @param c Client to notify.
1424 * @param ccn Channel ID.
1425 * @param port Channel's destination port.
1426 * @param opt Options (bit array).
1427 * @param peer Origin peer.
1428 */
1429void
1430GML_send_channel_create (struct CadetClient *c,
1431 struct GNUNET_CADET_ClientChannelNumber ccn,
1432 const struct GNUNET_HashCode *port,
1433 uint32_t opt,
1434 const struct GNUNET_PeerIdentity *peer)
1435{
1436 struct GNUNET_CADET_LocalChannelCreateMessage msg;
1437
1438 msg.header.size = htons (sizeof (msg));
1439 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_CREATE);
1440 msg.ccn = ccn;
1441 msg.port = *port;
1442 msg.opt = htonl (opt);
1443 msg.peer = *peer;
1444 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1445 &msg.header, GNUNET_NO);
1446}
1447
1448
1449/**
1450 * Build a local channel NACK message and send it to a local client.
1451 *
1452 * @param c Client to whom send the NACK.
1453 * @param ccn Channel ID to use
1454 */
1455void
1456GML_send_channel_nack (struct CadetClient *c,
1457 struct GNUNET_CADET_ClientChannelNumber ccn)
1458{
1459 struct GNUNET_CADET_LocalAck msg;
1460
1461 LOG (GNUNET_ERROR_TYPE_DEBUG,
1462 "send local nack on %X towards %p\n",
1463 ntohl (ccn.channel_of_client),
1464 c);
1465
1466 msg.header.size = htons (sizeof (msg));
1467 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED);
1468 msg.ccn = ccn;
1469 GNUNET_SERVER_notification_context_unicast (nc,
1470 c->handle,
1471 &msg.header,
1472 GNUNET_NO);
1473
1474}
1475
1476/**
1477 * Notify a client that a channel is no longer valid.
1478 *
1479 * @param c Client.
1480 * @param ccn ID of the channel that is destroyed.
1481 */
1482void
1483GML_send_channel_destroy (struct CadetClient *c,
1484 struct GNUNET_CADET_ClientChannelNumber ccn)
1485{
1486 struct GNUNET_CADET_LocalChannelDestroyMessage msg;
1487
1488 if (NULL == c)
1489 {
1490 GNUNET_break (0);
1491 return;
1492 }
1493 if (GNUNET_YES == c->shutting_down)
1494 return;
1495 msg.header.size = htons (sizeof (msg));
1496 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_CHANNEL_DESTROY);
1497 msg.ccn = ccn;
1498 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1499 &msg.header, GNUNET_NO);
1500}
1501
1502
1503/**
1504 * Modify the cadet message ID from global to local and send to client.
1505 *
1506 * @param c Client to send to.
1507 * @param msg Message to modify and send.
1508 * @param ccn Channel ID to use (c can be both owner and client).
1509 */
1510void
1511GML_send_data (struct CadetClient *c,
1512 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
1513 struct GNUNET_CADET_ClientChannelNumber ccn)
1514{
1515 struct GNUNET_CADET_LocalData *copy;
1516 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_CADET_ChannelAppDataMessage);
1517 char cbuf[size + sizeof (struct GNUNET_CADET_LocalData)];
1518
1519 if (size < sizeof (struct GNUNET_MessageHeader))
1520 {
1521 GNUNET_break_op (0);
1522 return;
1523 }
1524 if (NULL == c)
1525 {
1526 GNUNET_break (0);
1527 return;
1528 }
1529 copy = (struct GNUNET_CADET_LocalData *) cbuf;
1530 GNUNET_memcpy (&copy[1], &msg[1], size);
1531 copy->header.size = htons (sizeof (struct GNUNET_CADET_LocalData) + size);
1532 copy->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA);
1533 copy->ccn = ccn;
1534 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1535 &copy->header, GNUNET_NO);
1536}
1537
1538
1539/**
1540 * Get the static string to represent a client.
1541 *
1542 * @param c Client.
1543 *
1544 * @return Static string for the client.
1545 */
1546const char *
1547GML_2s (const struct CadetClient *c)
1548{
1549 static char buf[32];
1550
1551 SPRINTF (buf, "%u", c->id);
1552 return buf;
1553}
diff --git a/src/cadet/gnunet-service-cadet_local.h b/src/cadet/gnunet-service-cadet_local.h
deleted file mode 100644
index 113c2f489..000000000
--- a/src/cadet/gnunet-service-cadet_local.h
+++ /dev/null
@@ -1,234 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_local.h
23 * @brief cadet service; dealing with local clients
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GML (Gnunet Cadet Local)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_LOCAL_H
30#define GNUNET_SERVICE_CADET_LOCAL_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42
43/**
44 * Struct containing information about a client of the service
45 */
46struct CadetClient;
47
48#include "gnunet-service-cadet_channel.h"
49
50/******************************************************************************/
51/******************************** API ***********************************/
52/******************************************************************************/
53
54/**
55 * Initialize server subsystem.
56 *
57 * @param handle Server handle.
58 */
59void
60GML_init (struct GNUNET_SERVER_Handle *handle);
61
62/**
63 * Install server (service) handlers and start listening to clients.
64 */
65void
66GML_start (void);
67
68/**
69 * Shutdown server.
70 */
71void
72GML_shutdown (void);
73
74/**
75 * Get a channel from a client.
76 *
77 * @param c Client to check.
78 * @param ccn Channel ID, must be local (> 0x800...).
79 *
80 * @return non-NULL if channel exists in the clients lists
81 */
82struct CadetChannel *
83GML_channel_get (struct CadetClient *c,
84 struct GNUNET_CADET_ClientChannelNumber ccn);
85
86/**
87 * Add a channel to a client
88 *
89 * @param client Client.
90 * @param ccn Channel ID.
91 * @param ch Channel.
92 */
93void
94GML_channel_add (struct CadetClient *client,
95 struct GNUNET_CADET_ClientChannelNumber ccn,
96 struct CadetChannel *ch);
97
98/**
99 * Remove a channel from a client
100 *
101 * @param client Client.
102 * @param ccn Channel ID.
103 * @param ch Channel.
104 */
105void
106GML_channel_remove (struct CadetClient *client,
107 struct GNUNET_CADET_ClientChannelNumber ccn,
108 struct CadetChannel *ch);
109
110/**
111 * Get the tunnel's next free local channel ID.
112 *
113 * @param c Client.
114 *
115 * @return LID of a channel free to use.
116 */
117struct GNUNET_CADET_ClientChannelNumber
118GML_get_next_ccn (struct CadetClient *c);
119
120/**
121 * Check if client has registered with the service and has not disconnected
122 *
123 * @param client the client to check
124 *
125 * @return non-NULL if client exists in the global DLL
126 */
127struct CadetClient *
128GML_client_get (struct GNUNET_SERVER_Client *client);
129
130/**
131 * Find a client that has opened a port
132 *
133 * @param port Port to check.
134 *
135 * @return non-NULL if a client has the port.
136 */
137struct CadetClient *
138GML_client_get_by_port (const struct GNUNET_HashCode *port);
139
140/**
141 * Deletes a tunnel from a client (either owner or destination).
142 *
143 * @param c Client whose tunnel to delete.
144 * @param ch Channel which should be deleted.
145 * @param id Channel ID.
146 */
147void
148GML_client_delete_channel (struct CadetClient *c,
149 struct CadetChannel *ch,
150 struct GNUNET_CADET_ClientChannelNumber id);
151
152/**
153 * Build a local ACK message and send it to a local client, if needed.
154 *
155 * If the client was already allowed to send data, do nothing.
156 *
157 * @param c Client to whom send the ACK.
158 * @param id Channel ID to use
159 */
160void
161GML_send_ack (struct CadetClient *c,
162 struct GNUNET_CADET_ClientChannelNumber id);
163
164/**
165 * Notify the appropriate client that a new incoming channel was created.
166 *
167 * @param c Client to notify.
168 * @param id Channel ID.
169 * @param port Channel's destination port.
170 * @param opt Options (bit array).
171 * @param peer Origin peer.
172 */
173void
174GML_send_channel_create (struct CadetClient *c,
175 struct GNUNET_CADET_ClientChannelNumber id,
176 const struct GNUNET_HashCode *port,
177 uint32_t opt,
178 const struct GNUNET_PeerIdentity *peer);
179
180/**
181 * Build a local channel NACK message and send it to a local client.
182 *
183 * @param c Client to whom send the NACK.
184 * @param id Channel ID to use
185 */
186void
187GML_send_channel_nack (struct CadetClient *c,
188 struct GNUNET_CADET_ClientChannelNumber id);
189
190
191/**
192 * Notify a client that a channel is no longer valid.
193 *
194 * @param c Client.
195 * @param id ID of the channel that is destroyed.
196 */
197void
198GML_send_channel_destroy (struct CadetClient *c,
199 struct GNUNET_CADET_ClientChannelNumber id);
200
201
202/**
203 * Modify the cadet message ID from global to local and send to client.
204 *
205 * @param c Client to send to.
206 * @param msg Message to modify and send.
207 * @param id Channel ID to use (c can be both owner and client).
208 */
209void
210GML_send_data (struct CadetClient *c,
211 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
212 struct GNUNET_CADET_ClientChannelNumber id);
213
214/**
215 * Get the static string to represent a client.
216 *
217 * @param c Client.
218 *
219 * @return Static string for the client.
220 */
221const char *
222GML_2s (const struct CadetClient *c);
223
224
225#if 0 /* keep Emacsens' auto-indent happy */
226{
227#endif
228#ifdef __cplusplus
229}
230#endif
231
232/* ifndef GNUNET_CADET_SERVICE_LOCAL_H */
233#endif
234/* end of gnunet-cadet-service_LOCAL.h */
diff --git a/src/cadet/gnunet-service-cadet_peer.c b/src/cadet/gnunet-service-cadet_peer.c
deleted file mode 100644
index fa3f2be80..000000000
--- a/src/cadet/gnunet-service-cadet_peer.c
+++ /dev/null
@@ -1,2209 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013, 2015 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20/**
21 * @file cadet/gnunet-service-cadet_peer.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
24 */
25#include "platform.h"
26#include "gnunet_util_lib.h"
27#include "gnunet_signatures.h"
28#include "gnunet_transport_service.h"
29#include "gnunet_ats_service.h"
30#include "gnunet_core_service.h"
31#include "gnunet_statistics_service.h"
32#include "cadet_protocol.h"
33#include "gnunet-service-cadet_peer.h"
34#include "gnunet-service-cadet_dht.h"
35#include "gnunet-service-cadet_connection.h"
36#include "gnunet-service-cadet_tunnel.h"
37#include "cadet_path.h"
38
39#define LOG(level, ...) GNUNET_log_from (level,"cadet-p2p",__VA_ARGS__)
40#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-p2p",__VA_ARGS__)
41
42
43/******************************************************************************/
44/******************************** STRUCTS **********************************/
45/******************************************************************************/
46
47/**
48 * Information about a queued message on the peer level.
49 */
50struct CadetPeerQueue {
51
52 struct CadetPeerQueue *next;
53 struct CadetPeerQueue *prev;
54
55 /**
56 * Envelope to cancel message before MQ sends it.
57 */
58 struct GNUNET_MQ_Envelope *env;
59
60 /**
61 * Peer (neighbor) this message is being sent to.
62 */
63 struct CadetPeer *peer;
64
65 /**
66 * Continuation to call to notify higher layers about message sent.
67 */
68 GCP_sent cont;
69
70 /**
71 * Closure for @a cont.
72 */
73 void *cont_cls;
74
75 /**
76 * Task to asynchronously run the drop continuation.
77 */
78 struct GNUNET_SCHEDULER_Task *drop_task;
79
80 /**
81 * Time when message was queued for sending.
82 */
83 struct GNUNET_TIME_Absolute queue_timestamp;
84
85 /**
86 * #GNUNET_YES if message was management traffic (POLL, ACK, ...).
87 */
88 int management_traffic;
89
90 /**
91 * Message type.
92 */
93 uint16_t type;
94
95 /**
96 * Message size.
97 */
98 uint16_t size;
99
100 /**
101 * Type of the message's payload, if it was encrypted data.
102 */
103 uint16_t payload_type;
104
105 /**
106 * ID of the payload (PID, ACK #, ...).
107 */
108 struct CadetEncryptedMessageIdentifier payload_id;
109
110 /**
111 * Connection this message was sent on.
112 */
113 struct CadetConnection *c;
114
115 /**
116 * Direction in @a c this message was send on (#GNUNET_YES = FWD).
117 */
118 int c_fwd;
119};
120
121
122/**
123 * Struct containing all information regarding a given peer
124 */
125struct CadetPeer
126{
127 /**
128 * ID of the peer
129 */
130 GNUNET_PEER_Id id;
131
132 struct CadetPeerQueue *q_head;
133 struct CadetPeerQueue *q_tail;
134
135 /**
136 * Last time we heard from this peer
137 */
138 struct GNUNET_TIME_Absolute last_contact;
139
140 /**
141 * Paths to reach the peer, ordered by ascending hop count
142 */
143 struct CadetPeerPath *path_head;
144
145 /**
146 * Paths to reach the peer, ordered by ascending hop count
147 */
148 struct CadetPeerPath *path_tail;
149
150 /**
151 * Handle to stop the DHT search for paths to this peer
152 */
153 struct GCD_search_handle *search_h;
154
155 /**
156 * Handle to stop the DHT search for paths to this peer
157 */
158 struct GNUNET_SCHEDULER_Task *search_delayed;
159
160 /**
161 * Tunnel to this peer, if any.
162 */
163 struct CadetTunnel *tunnel;
164
165 /**
166 * Connections that go through this peer; indexed by tid.
167 */
168 struct GNUNET_CONTAINER_MultiShortmap *connections;
169
170 /**
171 * Handle for core transmissions.
172 */
173 struct GNUNET_MQ_Handle *core_mq;
174
175 /**
176 * How many messages are in the queue to this peer.
177 */
178 unsigned int queue_n;
179
180 /**
181 * Hello message.
182 */
183 struct GNUNET_HELLO_Message* hello;
184
185 /**
186 * Handle to us offering the HELLO to the transport.
187 */
188 struct GNUNET_TRANSPORT_OfferHelloHandle *hello_offer;
189
190 /**
191 * Handle to our ATS request asking ATS to suggest an address
192 * to TRANSPORT for this peer (to establish a direct link).
193 */
194 struct GNUNET_ATS_ConnectivitySuggestHandle *connectivity_suggestion;
195
196};
197
198
199/******************************************************************************/
200/******************************* GLOBALS ***********************************/
201/******************************************************************************/
202
203/**
204 * Global handle to the statistics service.
205 */
206extern struct GNUNET_STATISTICS_Handle *stats;
207
208/**
209 * Local peer own ID (full value).
210 */
211extern struct GNUNET_PeerIdentity my_full_id;
212
213/**
214 * Local peer own ID (short)
215 */
216extern GNUNET_PEER_Id myid;
217
218/**
219 * Peers known, indexed by PeerIdentity, values of type `struct CadetPeer`.
220 */
221static struct GNUNET_CONTAINER_MultiPeerMap *peers;
222
223/**
224 * How many peers do we want to remember?
225 */
226static unsigned long long max_peers;
227
228/**
229 * Percentage of messages that will be dropped (for test purposes only).
230 */
231static unsigned long long drop_percent;
232
233/**
234 * Handle to communicate with CORE.
235 */
236static struct GNUNET_CORE_Handle *core_handle;
237
238/**
239 * Our configuration;
240 */
241static const struct GNUNET_CONFIGURATION_Handle *cfg;
242
243/**
244 * Handle to communicate with ATS.
245 */
246static struct GNUNET_ATS_ConnectivityHandle *ats_ch;
247
248/**
249 * Shutdown falg.
250 */
251static int in_shutdown;
252
253
254/******************************************************************************/
255/***************************** CORE HELPERS *********************************/
256/******************************************************************************/
257
258
259/**
260 * Iterator to notify all connections of a broken link. Mark connections
261 * to destroy after all traffic has been sent.
262 *
263 * @param cls Closure (disconnected peer).
264 * @param key Current key code (peer id).
265 * @param value Value in the hash map (connection).
266 *
267 * @return #GNUNET_YES to continue to iterate.
268 */
269static int
270notify_broken (void *cls,
271 const struct GNUNET_ShortHashCode *key,
272 void *value)
273{
274 struct CadetPeer *peer = cls;
275 struct CadetConnection *c = value;
276
277 LOG (GNUNET_ERROR_TYPE_DEBUG,
278 "Notifying %s due to %s disconnect\n",
279 GCC_2s (c), GCP_2s (peer));
280 GCC_neighbor_disconnected (c, peer);
281 return GNUNET_YES;
282}
283
284
285/**
286 * Remove the direct path to the peer.
287 *
288 * @param peer Peer to remove the direct path from.
289 */
290static struct CadetPeerPath *
291pop_direct_path (struct CadetPeer *peer)
292{
293 struct CadetPeerPath *iter;
294
295 for (iter = peer->path_head; NULL != iter; iter = iter->next)
296 {
297 if (2 >= iter->length)
298 {
299 GNUNET_CONTAINER_DLL_remove (peer->path_head,
300 peer->path_tail,
301 iter);
302 return iter;
303 }
304 }
305 return NULL;
306}
307
308/**
309 * Call the continuation after a message has been sent or dropped.
310 *
311 * This funcion removes the message from the queue.
312 *
313 * @param q Queue handle.
314 * @param sent #GNUNET_YES if was sent to CORE, #GNUNET_NO if dropped.
315 */
316static void
317call_peer_cont (struct CadetPeerQueue *q, int sent);
318
319
320/******************************************************************************/
321/***************************** CORE CALLBACKS *********************************/
322/******************************************************************************/
323
324
325/**
326 * Method called whenever a given peer connects.
327 *
328 * @param cls Core closure (unused).
329 * @param peer Peer identity this notification is about
330 * @param mq Message Queue to this peer.
331 *
332 * @return Internal closure for handlers (CadetPeer struct).
333 */
334static void *
335core_connect_handler (void *cls,
336 const struct GNUNET_PeerIdentity *peer,
337 struct GNUNET_MQ_Handle *mq)
338{
339 struct CadetPeer *neighbor;
340 struct CadetPeerPath *path;
341 char own_id[16];
342
343 GCC_check_connections ();
344 GNUNET_snprintf (own_id,
345 sizeof (own_id),
346 "%s",
347 GNUNET_i2s (&my_full_id));
348
349 /* Save a path to the neighbor */
350 neighbor = GCP_get (peer, GNUNET_YES);
351 if (myid == neighbor->id)
352 {
353 LOG (GNUNET_ERROR_TYPE_INFO,
354 "CONNECTED %s (self)\n",
355 own_id);
356 path = path_new (1);
357 }
358 else
359 {
360 LOG (GNUNET_ERROR_TYPE_INFO,
361 "CONNECTED %s <= %s\n",
362 own_id,
363 GNUNET_i2s (peer));
364 path = path_new (2);
365 path->peers[1] = neighbor->id;
366 GNUNET_PEER_change_rc (neighbor->id, 1);
367 GNUNET_assert (NULL == neighbor->core_mq);
368 neighbor->core_mq = mq;
369 }
370 path->peers[0] = myid;
371 GNUNET_PEER_change_rc (myid, 1);
372 GCP_add_path (neighbor, path, GNUNET_YES);
373
374 /* Create the connections hashmap */
375 GNUNET_assert (NULL == neighbor->connections);
376 neighbor->connections = GNUNET_CONTAINER_multishortmap_create (16,
377 GNUNET_YES);
378 GNUNET_STATISTICS_update (stats,
379 "# peers",
380 1,
381 GNUNET_NO);
382
383 if ( (NULL != GCP_get_tunnel (neighbor)) &&
384 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
385 {
386 GCP_connect (neighbor);
387 }
388 GCC_check_connections ();
389
390 return neighbor;
391}
392
393
394/**
395 * Method called whenever a peer disconnects.
396 *
397 * @param cls Core closure (unused).
398 * @param peer Peer identity this notification is about.
399 * @param internal_cls Internal closure (CadetPeer struct).
400 */
401static void
402core_disconnect_handler (void *cls,
403 const struct GNUNET_PeerIdentity *peer,
404 void *internal_cls)
405{
406 struct CadetPeer *p = internal_cls;
407 struct CadetPeerPath *direct_path;
408 char own_id[16];
409
410 GCC_check_connections ();
411 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
412 own_id[15] = '\0';
413 if (myid == p->id)
414 {
415 LOG (GNUNET_ERROR_TYPE_INFO,
416 "DISCONNECTED %s (self)\n",
417 own_id);
418 }
419 else
420 {
421 LOG (GNUNET_ERROR_TYPE_INFO,
422 "DISCONNECTED %s <= %s\n",
423 own_id, GNUNET_i2s (peer));
424 p->core_mq = NULL;
425 }
426 direct_path = pop_direct_path (p);
427 if (NULL != p->connections)
428 {
429 GNUNET_CONTAINER_multishortmap_iterate (p->connections,
430 &notify_broken,
431 p);
432 GNUNET_CONTAINER_multishortmap_destroy (p->connections);
433 p->connections = NULL;
434 }
435 GNUNET_STATISTICS_update (stats,
436 "# peers",
437 -1,
438 GNUNET_NO);
439 path_destroy (direct_path);
440 GCC_check_connections ();
441}
442
443
444/******************************************************************************/
445/******************************************************************************/
446/******************************************************************************/
447/******************************************************************************/
448/******************************************************************************/
449
450/**
451 * Check if the create_connection message has the appropriate size.
452 *
453 * @param cls Closure (unused).
454 * @param msg Message to check.
455 *
456 * @return #GNUNET_YES if size is correct, #GNUNET_NO otherwise.
457 */
458static int
459check_create (void *cls, const struct GNUNET_CADET_ConnectionCreateMessage *msg)
460{
461 uint16_t size;
462
463 size = ntohs (msg->header.size);
464 if (size < sizeof (*msg))
465 {
466 GNUNET_break_op (0);
467 return GNUNET_NO;
468 }
469 return GNUNET_YES;
470}
471
472/**
473 * Handle for #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE
474 *
475 * @param cls Closure (CadetPeer for neighbor that sent the message).
476 * @param msg Message itself.
477 */
478static void
479handle_create (void *cls, const struct GNUNET_CADET_ConnectionCreateMessage *msg)
480{
481 struct CadetPeer *peer = cls;
482 GCC_handle_create (peer, msg);
483}
484
485
486/**
487 * Handle for #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK
488 *
489 * @param cls Closure (CadetPeer for neighbor that sent the message).
490 * @param msg Message itself.
491 */
492static void
493handle_confirm (void *cls, const struct GNUNET_CADET_ConnectionCreateAckMessage *msg)
494{
495 struct CadetPeer *peer = cls;
496 GCC_handle_confirm (peer, msg);
497}
498
499
500/**
501 * Handle for #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN
502 *
503 * @param cls Closure (CadetPeer for neighbor that sent the message).
504 * @param msg Message itself.
505 */
506static void
507handle_broken (void *cls, const struct GNUNET_CADET_ConnectionBrokenMessage *msg)
508{
509 struct CadetPeer *peer = cls;
510 GCC_handle_broken (peer, msg);
511}
512
513
514/**
515 * Handle for #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY
516 *
517 * @param cls Closure (CadetPeer for neighbor that sent the message).
518 * @param msg Message itself.
519 */
520static void
521handle_destroy (void *cls, const struct GNUNET_CADET_ConnectionDestroyMessage *msg)
522{
523 struct CadetPeer *peer = cls;
524 GCC_handle_destroy (peer, msg);
525}
526
527
528/**
529 * Handle for #GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK
530 *
531 * @param cls Closure (CadetPeer for neighbor that sent the message).
532 * @param msg Message itself.
533 */
534static void
535handle_ack (void *cls, const struct GNUNET_CADET_ConnectionEncryptedAckMessage *msg)
536{
537 struct CadetPeer *peer = cls;
538 GCC_handle_ack (peer, msg);
539}
540
541
542/**
543 * Handle for #GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL
544 *
545 * @param cls Closure (CadetPeer for neighbor that sent the message).
546 * @param msg Message itself.
547 */
548static void
549handle_poll (void *cls, const struct GNUNET_CADET_ConnectionHopByHopPollMessage *msg)
550{
551 struct CadetPeer *peer = cls;
552 GCC_handle_poll (peer, msg);
553}
554
555
556/**
557 * Handle for #GNUNET_MESSAGE_TYPE_CADET_TUNNEL_KX
558 *
559 * @param cls Closure (CadetPeer for neighbor that sent the message).
560 * @param msg Message itself.
561 */
562static void
563handle_kx (void *cls, const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
564{
565 struct CadetPeer *peer = cls;
566 GCC_handle_kx (peer, msg);
567}
568
569
570/**
571 * Check if the encrypted message has the appropriate size.
572 *
573 * @param cls Closure (unused).
574 * @param msg Message to check.
575 *
576 * @return #GNUNET_YES if size is correct, #GNUNET_NO otherwise.
577 */
578static int
579check_encrypted (void *cls, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
580{
581 uint16_t size;
582 uint16_t minimum_size;
583
584 size = ntohs (msg->header.size);
585 minimum_size = sizeof (struct GNUNET_CADET_TunnelEncryptedMessage)
586 + sizeof (struct GNUNET_MessageHeader);
587
588 if (size < minimum_size)
589 {
590 GNUNET_break_op (0);
591 return GNUNET_NO;
592 }
593 return GNUNET_YES;
594}
595
596/**
597 * Handle for #GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED.
598 *
599 * @param cls Closure (CadetPeer for neighbor that sent the message).
600 * @param msg Message itself.
601 */
602static void
603handle_encrypted (void *cls, const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
604{
605 struct CadetPeer *peer = cls;
606 GCC_handle_encrypted (peer, msg);
607}
608
609
610/**
611 * To be called on core init/fail.
612 *
613 * @param cls Closure (config)
614 * @param identity The public identity of this peer.
615 */
616static void
617core_init_notify (void *cls,
618 const struct GNUNET_PeerIdentity *identity);
619
620
621static void
622connect_to_core (const struct GNUNET_CONFIGURATION_Handle *c)
623{
624 struct GNUNET_MQ_MessageHandler core_handlers[] = {
625 GNUNET_MQ_hd_var_size (create,
626 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE,
627 struct GNUNET_CADET_ConnectionCreateMessage,
628 NULL),
629 GNUNET_MQ_hd_fixed_size (confirm,
630 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE_ACK,
631 struct GNUNET_CADET_ConnectionCreateAckMessage,
632 NULL),
633 GNUNET_MQ_hd_fixed_size (broken,
634 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
635 struct GNUNET_CADET_ConnectionBrokenMessage,
636 NULL),
637 GNUNET_MQ_hd_fixed_size (destroy,
638 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
639 struct GNUNET_CADET_ConnectionDestroyMessage,
640 NULL),
641 GNUNET_MQ_hd_fixed_size (ack,
642 GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK,
643 struct GNUNET_CADET_ConnectionEncryptedAckMessage,
644 NULL),
645 GNUNET_MQ_hd_fixed_size (poll,
646 GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL,
647 struct GNUNET_CADET_ConnectionHopByHopPollMessage,
648 NULL),
649 GNUNET_MQ_hd_fixed_size (kx,
650 GNUNET_MESSAGE_TYPE_CADET_TUNNEL_KX,
651 struct GNUNET_CADET_TunnelKeyExchangeMessage,
652 NULL),
653 GNUNET_MQ_hd_var_size (encrypted,
654 GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED,
655 struct GNUNET_CADET_TunnelEncryptedMessage,
656 NULL),
657 GNUNET_MQ_handler_end ()
658 };
659 core_handle = GNUNET_CORE_connect (c, NULL,
660 &core_init_notify,
661 &core_connect_handler,
662 &core_disconnect_handler,
663 core_handlers);
664}
665
666/******************************************************************************/
667/******************************************************************************/
668/******************************************************************************/
669/******************************************************************************/
670/******************************************************************************/
671
672/**
673 * To be called on core init/fail.
674 *
675 * @param cls Closure (config)
676 * @param identity The public identity of this peer.
677 */
678static void
679core_init_notify (void *cls,
680 const struct GNUNET_PeerIdentity *core_identity)
681{
682 const struct GNUNET_CONFIGURATION_Handle *c = cls;
683
684 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
685 if (0 != memcmp (core_identity, &my_full_id, sizeof (my_full_id)))
686 {
687 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
688 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (core_identity));
689 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
690 GNUNET_CORE_disconnect (core_handle);
691 connect_to_core (c);
692 return;
693 }
694 GML_start ();
695}
696
697
698/******************************************************************************/
699/******************************** STATIC ***********************************/
700/******************************************************************************/
701
702
703/**
704 * Get priority for a queued message.
705 *
706 * @param q Queued message
707 *
708 * @return CORE priority to use.
709 *
710 * FIXME make static
711 * FIXME use when sending
712 */
713enum GNUNET_CORE_Priority
714get_priority (struct CadetPeerQueue *q)
715{
716 enum GNUNET_CORE_Priority low;
717 enum GNUNET_CORE_Priority high;
718
719 if (NULL == q)
720 {
721 GNUNET_break (0);
722 return GNUNET_CORE_PRIO_BACKGROUND;
723 }
724
725 /* Relayed traffic has lower priority, our own traffic has higher */
726 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->c_fwd))
727 {
728 low = GNUNET_CORE_PRIO_BEST_EFFORT;
729 high = GNUNET_CORE_PRIO_URGENT;
730 }
731 else
732 {
733 low = GNUNET_CORE_PRIO_URGENT;
734 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
735 }
736
737 /* Bulky payload has lower priority, control traffic has higher. */
738 if (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED == q->type)
739 return low;
740 return high;
741}
742
743
744/**
745 * Cancel all messages queued to CORE MQ towards this peer.
746 *
747 * @param peer Peer towards which to cancel all messages.
748 */
749static void
750cancel_queued_messages (struct CadetPeer *peer)
751{
752 while (NULL != peer->q_head)
753 {
754 struct CadetPeerQueue *q;
755
756 q = peer->q_head;
757 call_peer_cont (q, GNUNET_NO);
758 GNUNET_free (q);
759 }
760}
761
762
763/**
764 * Destroy the peer_info and free any allocated resources linked to it
765 *
766 * @param peer The peer_info to destroy.
767 * @return #GNUNET_OK on success
768 */
769static int
770peer_destroy (struct CadetPeer *peer)
771{
772 struct GNUNET_PeerIdentity id;
773 struct CadetPeerPath *p;
774 struct CadetPeerPath *nextp;
775
776 GNUNET_PEER_resolve (peer->id, &id);
777 GNUNET_PEER_change_rc (peer->id, -1);
778
779 LOG (GNUNET_ERROR_TYPE_INFO,
780 "destroying peer %s\n",
781 GNUNET_i2s (&id));
782
783 if (GNUNET_YES !=
784 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
785 {
786 GNUNET_break (0);
787 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
788 }
789 GCP_stop_search (peer);
790 p = peer->path_head;
791 while (NULL != p)
792 {
793 nextp = p->next;
794 GNUNET_CONTAINER_DLL_remove (peer->path_head,
795 peer->path_tail,
796 p);
797 path_destroy (p);
798 p = nextp;
799 }
800 if (NULL != peer->tunnel)
801 GCT_destroy_empty (peer->tunnel);
802 if (NULL != peer->connections)
803 {
804 GNUNET_assert (0 == GNUNET_CONTAINER_multishortmap_size (peer->connections));
805 GNUNET_CONTAINER_multishortmap_destroy (peer->connections);
806 peer->connections = NULL;
807 }
808 if (NULL != peer->hello_offer)
809 {
810 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
811 peer->hello_offer = NULL;
812 }
813 if (NULL != peer->connectivity_suggestion)
814 {
815 GNUNET_ATS_connectivity_suggest_cancel (peer->connectivity_suggestion);
816 peer->connectivity_suggestion = NULL;
817 }
818 cancel_queued_messages (peer);
819
820 GNUNET_free_non_null (peer->hello);
821 GNUNET_free (peer);
822 return GNUNET_OK;
823}
824
825
826/**
827 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
828 *
829 * @param cls closure
830 * @param key current key code
831 * @param value value in the hash map
832 * @return #GNUNET_YES if we should continue to iterate,
833 * #GNUNET_NO if not.
834 */
835static int
836shutdown_peer (void *cls,
837 const struct GNUNET_PeerIdentity *key,
838 void *value)
839{
840 struct CadetPeer *p = value;
841 struct CadetTunnel *t = p->tunnel;
842
843 LOG (GNUNET_ERROR_TYPE_DEBUG, " shutting down %s\n", GCP_2s (p));
844 if (NULL != t)
845 GCT_destroy (t);
846 p->tunnel = NULL;
847 peer_destroy (p);
848 return GNUNET_YES;
849}
850
851
852/**
853 * Check if peer is searching for a path (either active or delayed search).
854 *
855 * @param peer Peer to check
856 * @return #GNUNET_YES if there is a search active.
857 * #GNUNET_NO otherwise.
858 */
859static int
860is_searching (const struct CadetPeer *peer)
861{
862 return ( (NULL == peer->search_h) &&
863 (NULL == peer->search_delayed) ) ?
864 GNUNET_NO : GNUNET_YES;
865}
866
867
868/**
869 * @brief Start a search for a peer.
870 *
871 * @param cls Closure (Peer to search for).
872 */
873static void
874delayed_search (void *cls)
875{
876 struct CadetPeer *peer = cls;
877
878 peer->search_delayed = NULL;
879 GCC_check_connections ();
880 GCP_start_search (peer);
881 GCC_check_connections ();
882}
883
884
885/**
886 * Returns if peer is used (has a tunnel or is neighbor).
887 *
888 * @param peer Peer to check.
889 * @return #GNUNET_YES if peer is in use.
890 */
891static int
892peer_is_used (struct CadetPeer *peer)
893{
894 struct CadetPeerPath *p;
895
896 if (NULL != peer->tunnel)
897 return GNUNET_YES;
898
899 for (p = peer->path_head; NULL != p; p = p->next)
900 {
901 if (p->length < 3)
902 return GNUNET_YES;
903 }
904 return GNUNET_NO;
905}
906
907
908/**
909 * Iterator over all the peers to get the oldest timestamp.
910 *
911 * @param cls Closure (unsued).
912 * @param key ID of the peer.
913 * @param value Peer_Info of the peer.
914 */
915static int
916peer_get_oldest (void *cls,
917 const struct GNUNET_PeerIdentity *key,
918 void *value)
919{
920 struct CadetPeer *p = value;
921 struct GNUNET_TIME_Absolute *abs = cls;
922
923 /* Don't count active peers */
924 if (GNUNET_YES == peer_is_used (p))
925 return GNUNET_YES;
926
927 if (abs->abs_value_us < p->last_contact.abs_value_us)
928 abs->abs_value_us = p->last_contact.abs_value_us;
929
930 return GNUNET_YES;
931}
932
933
934/**
935 * Iterator over all the peers to remove the oldest entry.
936 *
937 * @param cls Closure (unsued).
938 * @param key ID of the peer.
939 * @param value Peer_Info of the peer.
940 */
941static int
942peer_timeout (void *cls,
943 const struct GNUNET_PeerIdentity *key,
944 void *value)
945{
946 struct CadetPeer *p = value;
947 struct GNUNET_TIME_Absolute *abs = cls;
948
949 LOG (GNUNET_ERROR_TYPE_WARNING,
950 "peer %s timeout\n", GNUNET_i2s (key));
951
952 if (p->last_contact.abs_value_us == abs->abs_value_us &&
953 GNUNET_NO == peer_is_used (p))
954 {
955 peer_destroy (p);
956 return GNUNET_NO;
957 }
958 return GNUNET_YES;
959}
960
961
962/**
963 * Delete oldest unused peer.
964 */
965static void
966peer_delete_oldest (void)
967{
968 struct GNUNET_TIME_Absolute abs;
969
970 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
971
972 GNUNET_CONTAINER_multipeermap_iterate (peers,
973 &peer_get_oldest,
974 &abs);
975 GNUNET_CONTAINER_multipeermap_iterate (peers,
976 &peer_timeout,
977 &abs);
978}
979
980
981/**
982 * Choose the best (yet unused) path towards a peer,
983 * considering the tunnel properties.
984 *
985 * @param peer The destination peer.
986 * @return Best current known path towards the peer, if any.
987 */
988static struct CadetPeerPath *
989peer_get_best_path (const struct CadetPeer *peer)
990{
991 struct CadetPeerPath *best_p;
992 struct CadetPeerPath *p;
993 unsigned int best_cost;
994 unsigned int cost;
995
996 best_cost = UINT_MAX;
997 best_p = NULL;
998 for (p = peer->path_head; NULL != p; p = p->next)
999 {
1000 if (GNUNET_NO == path_is_valid (p))
1001 continue; /* Don't use invalid paths. */
1002 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
1003 continue; /* If path is already in use, skip it. */
1004
1005 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
1006 {
1007 best_cost = cost;
1008 best_p = p;
1009 }
1010 }
1011 return best_p;
1012}
1013
1014
1015/**
1016 * Function to process paths received for a new peer addition. The recorded
1017 * paths form the initial tunnel, which can be optimized later.
1018 * Called on each result obtained for the DHT search.
1019 *
1020 * @param cls Closure (peer towards a path has been found).
1021 * @param path Path created from the DHT query. Will be freed afterwards.
1022 */
1023static void
1024search_handler (void *cls, const struct CadetPeerPath *path)
1025{
1026 struct CadetPeer *peer = cls;
1027 unsigned int connection_count;
1028
1029 GCC_check_connections ();
1030 GCP_add_path_to_all (path, GNUNET_NO);
1031
1032 /* Count connections */
1033 connection_count = GCT_count_connections (peer->tunnel);
1034
1035 /* If we already have our minimum (or more) connections, it's enough */
1036 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1037 {
1038 GCC_check_connections ();
1039 return;
1040 }
1041
1042 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1043 {
1044 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1045 GCP_connect (peer);
1046 }
1047 GCC_check_connections ();
1048}
1049
1050
1051/**
1052 * Test if a message type is connection management traffic
1053 * or regular payload traffic.
1054 *
1055 * @param type Message type.
1056 *
1057 * @return #GNUNET_YES if connection management, #GNUNET_NO otherwise.
1058 */
1059static int
1060is_connection_management (uint16_t type)
1061{
1062 return type == GNUNET_MESSAGE_TYPE_CADET_CONNECTION_HOP_BY_HOP_ENCRYPTED_ACK ||
1063 type == GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED_POLL;
1064}
1065
1066
1067/**
1068 * Debug function should NEVER return true in production code, useful to
1069 * simulate losses for testcases.
1070 *
1071 * @return #GNUNET_YES or #GNUNET_NO with the decision to drop.
1072 */
1073static int
1074should_I_drop (void)
1075{
1076 if (0 == drop_percent)
1077 return GNUNET_NO;
1078
1079 if (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1080 return GNUNET_YES;
1081
1082 return GNUNET_NO;
1083}
1084
1085
1086/******************************************************************************/
1087/******************************** API ***********************************/
1088/******************************************************************************/
1089
1090/**
1091 * Call the continuation after a message has been sent or dropped.
1092 *
1093 * This funcion removes the message from the queue.
1094 *
1095 * @param q Queue handle.
1096 * @param sent #GNUNET_YES if was sent to CORE, #GNUNET_NO if dropped.
1097 */
1098static void
1099call_peer_cont (struct CadetPeerQueue *q, int sent)
1100{
1101 LOG (GNUNET_ERROR_TYPE_DEBUG, " core mq just sent %s\n", GC_m2s (q->type));
1102 if (NULL != q->cont)
1103 {
1104 struct GNUNET_TIME_Relative wait_time;
1105
1106 wait_time = GNUNET_TIME_absolute_get_duration (q->queue_timestamp);
1107 LOG (GNUNET_ERROR_TYPE_DEBUG,
1108 " calling callback on %s after %s\n",
1109 GCC_2s (q->c),
1110 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1111 q->cont (q->cont_cls,
1112 q->c, q->c_fwd, sent,
1113 q->type,
1114 q->payload_type,
1115 q->payload_id,
1116 q->size, wait_time);
1117 q->cont = NULL;
1118 }
1119 GNUNET_CONTAINER_DLL_remove (q->peer->q_head, q->peer->q_tail, q);
1120}
1121
1122
1123/**
1124 * Function called by MQ when a message is sent to CORE.
1125 *
1126 * @param cls Closure (queue handle).
1127 */
1128static void
1129mq_sent (void *cls)
1130{
1131 struct CadetPeerQueue *q = cls;
1132
1133 if (GNUNET_NO == q->management_traffic)
1134 {
1135 q->peer->queue_n--;
1136 }
1137 call_peer_cont (q, GNUNET_YES);
1138 GNUNET_free (q);
1139}
1140
1141
1142/**
1143 * Finish the drop operation.
1144 *
1145 * @param cls queue entry to finish drop for
1146 */
1147static void
1148drop_cb (void *cls)
1149{
1150 struct CadetPeerQueue *q = cls;
1151
1152 GNUNET_MQ_discard (q->env);
1153 call_peer_cont (q, GNUNET_YES);
1154 GNUNET_free (q);
1155}
1156
1157
1158/**
1159 * @brief Send a message to another peer (using CORE).
1160 *
1161 * @param peer Peer towards which to queue the message.
1162 * @param message Message to send.
1163 * @param payload_type Type of the message's payload, for debug messages.
1164 * 0 if the message is a retransmission (unknown payload).
1165 * UINT16_MAX if the message does not have payload.
1166 * @param payload_id ID of the payload (MID, ACK #, etc)
1167 * @param c Connection this message belongs to (can be NULL).
1168 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1169 * @param cont Continuation to be called once CORE has sent the message.
1170 * @param cont_cls Closure for @c cont.
1171 *
1172 * @return A handle to the message in the queue or NULL (if dropped).
1173 */
1174struct CadetPeerQueue *
1175GCP_send (struct CadetPeer *peer,
1176 const struct GNUNET_MessageHeader *message,
1177 uint16_t payload_type,
1178 struct CadetEncryptedMessageIdentifier payload_id,
1179 struct CadetConnection *c,
1180 int fwd,
1181 GCP_sent cont,
1182 void *cont_cls)
1183{
1184 struct CadetPeerQueue *q;
1185 uint16_t type;
1186 uint16_t size;
1187
1188 GCC_check_connections ();
1189 type = ntohs (message->type);
1190 size = ntohs (message->size);
1191 LOG (GNUNET_ERROR_TYPE_DEBUG,
1192 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1193 GC_m2s (type), GC_m2s (payload_type),
1194 ntohl (payload_id.pid),
1195 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1196
1197 if (NULL == peer->connections)
1198 {
1199 /* We are not connected to this peer, ignore request. */
1200 GNUNET_break (0);
1201 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1202 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1203 GNUNET_NO);
1204 return NULL;
1205 }
1206
1207 q = GNUNET_new (struct CadetPeerQueue);
1208 q->env = GNUNET_MQ_msg_copy (message);
1209 q->peer = peer;
1210 q->cont = cont;
1211 q->cont_cls = cont_cls;
1212 q->queue_timestamp = GNUNET_TIME_absolute_get ();
1213 q->management_traffic = is_connection_management (type);
1214 q->type = type;
1215 q->size = size;
1216 q->payload_type = payload_type;
1217 q->payload_id = payload_id;
1218 q->c = c;
1219 q->c_fwd = fwd;
1220 GNUNET_MQ_notify_sent (q->env, &mq_sent, q);
1221 GNUNET_CONTAINER_DLL_insert (peer->q_head, peer->q_tail, q);
1222
1223 if (GNUNET_YES == q->management_traffic)
1224 {
1225 GNUNET_MQ_send (peer->core_mq, q->env); // FIXME implement "_urgent", use
1226 }
1227 else
1228 {
1229 if (GNUNET_YES == should_I_drop ())
1230 {
1231 LOG (GNUNET_ERROR_TYPE_WARNING,
1232 "DD %s (%s %u) on conn %s %s (random drop for testing)\n",
1233 GC_m2s (q->type),
1234 GC_m2s (q->payload_type),
1235 ntohl (q->payload_id.pid),
1236 GCC_2s (c),
1237 GC_f2s (q->c_fwd));
1238 q->drop_task = GNUNET_SCHEDULER_add_now (&drop_cb,
1239 q);
1240 return q;
1241 }
1242 GNUNET_MQ_send (peer->core_mq, q->env);
1243 peer->queue_n++;
1244 }
1245
1246 GCC_check_connections ();
1247 return q;
1248}
1249
1250
1251/**
1252 * Cancel sending a message. Message must have been sent with
1253 * #GCP_send before. May not be called after the notify sent
1254 * callback has been called.
1255 *
1256 * It DOES call the continuation given to #GCP_send.
1257 *
1258 * @param q Queue handle to cancel
1259 */
1260void
1261GCP_send_cancel (struct CadetPeerQueue *q)
1262{
1263 if (NULL != q->drop_task)
1264 {
1265 GNUNET_SCHEDULER_cancel (q->drop_task);
1266 q->drop_task = NULL;
1267 GNUNET_MQ_discard (q->env);
1268 }
1269 else
1270 {
1271 GNUNET_MQ_send_cancel (q->env);
1272 }
1273 call_peer_cont (q, GNUNET_NO);
1274 GNUNET_free (q);
1275}
1276
1277
1278/**
1279 * Initialize the peer subsystem.
1280 *
1281 * @param c Configuration.
1282 */
1283void
1284GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1285{
1286 cfg = c;
1287 LOG (GNUNET_ERROR_TYPE_DEBUG,
1288 "GCP_init\n");
1289 in_shutdown = GNUNET_NO;
1290 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1291 if (GNUNET_OK !=
1292 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1293 &max_peers))
1294 {
1295 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1296 "CADET", "MAX_PEERS", "USING DEFAULT");
1297 max_peers = 1000;
1298 }
1299
1300 if (GNUNET_OK !=
1301 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1302 &drop_percent))
1303 {
1304 drop_percent = 0;
1305 }
1306 else
1307 {
1308 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1309 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1310 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1311 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1312 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1313 }
1314 ats_ch = GNUNET_ATS_connectivity_init (c);
1315 connect_to_core (c);
1316 if (NULL == core_handle)
1317 {
1318 GNUNET_break (0);
1319 GNUNET_SCHEDULER_shutdown ();
1320 }
1321}
1322
1323
1324/**
1325 * Shut down the peer subsystem.
1326 */
1327void
1328GCP_shutdown (void)
1329{
1330 LOG (GNUNET_ERROR_TYPE_DEBUG,
1331 "Shutting down peer subsystem\n");
1332 in_shutdown = GNUNET_YES;
1333 if (NULL != core_handle)
1334 {
1335 GNUNET_CORE_disconnect (core_handle);
1336 core_handle = NULL;
1337 }
1338 GNUNET_PEER_change_rc (myid, -1);
1339 /* With MQ API, CORE calls the disconnect handler for every peer
1340 * after calling GNUNET_CORE_disconnect, shutdown must occur *after* that.
1341 */
1342 GNUNET_CONTAINER_multipeermap_iterate (peers,
1343 &shutdown_peer,
1344 NULL);
1345 if (NULL != ats_ch)
1346 {
1347 GNUNET_ATS_connectivity_done (ats_ch);
1348 ats_ch = NULL;
1349 }
1350 GNUNET_CONTAINER_multipeermap_destroy (peers);
1351 peers = NULL;
1352}
1353
1354
1355/**
1356 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1357 * one and insert it in the appropriate structures if the peer is not known yet.
1358 *
1359 * @param peer_id Full identity of the peer.
1360 * @param create #GNUNET_YES if a new peer should be created if unknown.
1361 * #GNUNET_NO otherwise.
1362 *
1363 * @return Existing or newly created peer structure.
1364 * NULL if unknown and not requested @a create
1365 */
1366struct CadetPeer *
1367GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1368{
1369 struct CadetPeer *peer;
1370
1371 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1372 if (NULL == peer)
1373 {
1374 peer = GNUNET_new (struct CadetPeer);
1375 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1376 {
1377 peer_delete_oldest ();
1378 }
1379 GNUNET_assert (GNUNET_OK ==
1380 GNUNET_CONTAINER_multipeermap_put (peers,
1381 peer_id,
1382 peer,
1383 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1384 peer->id = GNUNET_PEER_intern (peer_id);
1385 }
1386 peer->last_contact = GNUNET_TIME_absolute_get ();
1387
1388 return peer;
1389}
1390
1391
1392/**
1393 * Retrieve the CadetPeer stucture associated with the
1394 * peer. Optionally create one and insert it in the appropriate
1395 * structures if the peer is not known yet.
1396 *
1397 * @param peer Short identity of the peer.
1398 * @param create #GNUNET_YES if a new peer should be created if unknown.
1399 * #GNUNET_NO otherwise.
1400 *
1401 * @return Existing or newly created peer structure.
1402 * NULL if unknown and not requested @a create
1403 */
1404struct CadetPeer *
1405GCP_get_short (const GNUNET_PEER_Id peer, int create)
1406{
1407 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1408}
1409
1410
1411/**
1412 * Function called once #GNUNET_TRANSPORT_offer_hello() is done.
1413 * Marks the operation as finished.
1414 *
1415 * @param cls Closure (our `struct CadetPeer`).
1416 */
1417static void
1418hello_offer_done (void *cls)
1419{
1420 struct CadetPeer *peer = cls;
1421
1422 peer->hello_offer = NULL;
1423}
1424
1425
1426/**
1427 * Try to establish a new connection to this peer (in its tunnel).
1428 * If the peer doesn't have any path to it yet, try to get one.
1429 * If the peer already has some path, send a CREATE CONNECTION towards it.
1430 *
1431 * @param peer Peer to connect to.
1432 */
1433void
1434GCP_connect (struct CadetPeer *peer)
1435{
1436 struct CadetTunnel *t;
1437 struct CadetPeerPath *path;
1438 struct CadetConnection *c;
1439 int rerun_search;
1440
1441 GCC_check_connections ();
1442 LOG (GNUNET_ERROR_TYPE_DEBUG,
1443 "peer_connect towards %s\n",
1444 GCP_2s (peer));
1445 /* If we have a current hello, try to connect using it. */
1446 GCP_try_connect (peer);
1447
1448 t = peer->tunnel;
1449 c = NULL;
1450 rerun_search = GNUNET_NO;
1451
1452 if (NULL != peer->path_head)
1453 {
1454 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1455 path = peer_get_best_path (peer);
1456 if (NULL != path)
1457 {
1458 char *s;
1459
1460 s = path_2s (path);
1461 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1462 GNUNET_free (s);
1463
1464 c = GCT_use_path (t, path);
1465 if (NULL == c)
1466 {
1467 /* This case can happen when the path includes a first hop that is
1468 * not yet known to be connected.
1469 *
1470 * This happens quite often during testing when running cadet
1471 * under valgrind: core connect notifications come very late
1472 * and the DHT result has already come and created a valid
1473 * path. In this case, the peer->connections
1474 * hashmaps will be NULL and tunnel_use_path will not be able
1475 * to create a connection from that path.
1476 *
1477 * Re-running the DHT GET should give core time to callback.
1478 *
1479 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1480 * updating statistics about this issue.
1481 */
1482 rerun_search = GNUNET_YES;
1483 }
1484 else
1485 {
1486 GCC_send_create (c);
1487 return;
1488 }
1489 }
1490 else
1491 {
1492 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1493 }
1494 }
1495
1496 if (GNUNET_YES == rerun_search)
1497 {
1498 struct GNUNET_TIME_Relative delay;
1499
1500 GCP_stop_search (peer);
1501 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1502 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
1503 &delayed_search,
1504 peer);
1505 GCC_check_connections ();
1506 return;
1507 }
1508
1509 if (GNUNET_NO == is_searching (peer))
1510 GCP_start_search (peer);
1511 GCC_check_connections ();
1512}
1513
1514
1515/**
1516 * Chech whether there is a direct (core level) connection to peer.
1517 *
1518 * @param peer Peer to check.
1519 *
1520 * @return #GNUNET_YES if there is a direct connection.
1521 */
1522int
1523GCP_is_neighbor (const struct CadetPeer *peer)
1524{
1525 struct CadetPeerPath *path;
1526
1527 if (NULL == peer->connections)
1528 return GNUNET_NO;
1529
1530 for (path = peer->path_head; NULL != path; path = path->next)
1531 {
1532 if (3 > path->length)
1533 return GNUNET_YES;
1534 }
1535
1536 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1537 return GNUNET_NO;
1538}
1539
1540
1541/**
1542 * Create and initialize a new tunnel towards a peer, in case it has none.
1543 * In case the peer already has a tunnel, nothing is done.
1544 *
1545 * Does not generate any traffic, just creates the local data structures.
1546 *
1547 * @param peer Peer towards which to create the tunnel.
1548 */
1549void
1550GCP_add_tunnel (struct CadetPeer *peer)
1551{
1552 GCC_check_connections ();
1553 if (NULL != peer->tunnel)
1554 return;
1555 peer->tunnel = GCT_new (peer);
1556 GCC_check_connections ();
1557}
1558
1559
1560/**
1561 * Add a connection to a neighboring peer.
1562 *
1563 * Store that the peer is the first hop of the connection in one
1564 * direction and that on peer disconnect the connection must be
1565 * notified and destroyed, for it will no longer be valid.
1566 *
1567 * @param peer Peer to add connection to.
1568 * @param c Connection to add.
1569 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1570 */
1571void
1572GCP_add_connection (struct CadetPeer *peer,
1573 struct CadetConnection *c,
1574 int pred)
1575{
1576 LOG (GNUNET_ERROR_TYPE_DEBUG,
1577 "adding connection %s\n",
1578 GCC_2s (c));
1579 LOG (GNUNET_ERROR_TYPE_DEBUG,
1580 "to peer %s\n",
1581 GCP_2s (peer));
1582 GNUNET_assert (NULL != peer->connections);
1583 GNUNET_assert (GNUNET_OK ==
1584 GNUNET_CONTAINER_multishortmap_put (peer->connections,
1585 &GCC_get_id (c)->connection_of_tunnel,
1586 c,
1587 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1588 LOG (GNUNET_ERROR_TYPE_DEBUG,
1589 "Peer %s has now %u connections.\n",
1590 GCP_2s (peer),
1591 GNUNET_CONTAINER_multishortmap_size (peer->connections));
1592}
1593
1594
1595/**
1596 * Add the path to the peer and update the path used to reach it in case this
1597 * is the shortest.
1598 *
1599 * @param peer Destination peer to add the path to.
1600 * @param path New path to add. Last peer must be @c peer.
1601 * Path will be either used of freed if already known.
1602 * @param trusted Do we trust that this path is real?
1603 *
1604 * @return path if path was taken, pointer to existing duplicate if exists
1605 * NULL on error.
1606 */
1607struct CadetPeerPath *
1608GCP_add_path (struct CadetPeer *peer,
1609 struct CadetPeerPath *path,
1610 int trusted)
1611{
1612 struct CadetPeerPath *aux;
1613 unsigned int l;
1614 unsigned int l2;
1615
1616 GCC_check_connections ();
1617 LOG (GNUNET_ERROR_TYPE_DEBUG,
1618 "adding path [%u] to peer %s\n",
1619 path->length, GCP_2s (peer));
1620
1621 if (NULL == peer || NULL == path
1622 || path->peers[path->length - 1] != peer->id)
1623 {
1624 GNUNET_break (0);
1625 path_destroy (path);
1626 return NULL;
1627 }
1628
1629 for (l = 1; l < path->length; l++)
1630 {
1631 if (path->peers[l] == myid)
1632 {
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
1634 for (l2 = 0; l2 < path->length - l; l2++)
1635 {
1636 path->peers[l2] = path->peers[l + l2];
1637 }
1638 path->length -= l;
1639 l = 1;
1640 path->peers = GNUNET_realloc (path->peers,
1641 path->length * sizeof (GNUNET_PEER_Id));
1642 }
1643 }
1644
1645 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
1646
1647 if (2 >= path->length && GNUNET_NO == trusted)
1648 {
1649 /* Only allow CORE to tell us about direct paths */
1650 path_destroy (path);
1651 return NULL;
1652 }
1653
1654 l = path_get_length (path);
1655 if (0 == l)
1656 {
1657 path_destroy (path);
1658 return NULL;
1659 }
1660
1661 GNUNET_assert (peer->id == path->peers[path->length - 1]);
1662 for (aux = peer->path_head; aux != NULL; aux = aux->next)
1663 {
1664 l2 = path_get_length (aux);
1665 if (l2 > l)
1666 {
1667 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
1668 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
1669 peer->path_tail, aux, path);
1670 goto finish;
1671 }
1672 else
1673 {
1674 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1675 {
1676 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
1677 path_destroy (path);
1678 return aux;
1679 }
1680 }
1681 }
1682 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head,
1683 peer->path_tail,
1684 path);
1685 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
1686
1687finish:
1688 if (NULL != peer->tunnel
1689 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel)
1690 && 2 < path->length) /* Direct paths are handled by core_connect */
1691 {
1692 GCP_connect (peer);
1693 }
1694 GCC_check_connections ();
1695 return path;
1696}
1697
1698
1699/**
1700 * Add the path to the origin peer and update the path used to reach it in case
1701 * this is the shortest.
1702 * The path is given in peer_info -> destination, therefore we turn the path
1703 * upside down first.
1704 *
1705 * @param peer Peer to add the path to, being the origin of the path.
1706 * @param path New path to add after being inversed.
1707 * Path will be either used or freed.
1708 * @param trusted Do we trust that this path is real?
1709 *
1710 * @return path if path was taken, pointer to existing duplicate if exists
1711 * NULL on error.
1712 */
1713struct CadetPeerPath *
1714GCP_add_path_to_origin (struct CadetPeer *peer,
1715 struct CadetPeerPath *path,
1716 int trusted)
1717{
1718 if (NULL == path)
1719 return NULL;
1720 path_invert (path);
1721 return GCP_add_path (peer, path, trusted);
1722}
1723
1724
1725/**
1726 * Adds a path to the info of all the peers in the path
1727 *
1728 * @param p Path to process.
1729 * @param confirmed Whether we know if the path works or not.
1730 */
1731void
1732GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
1733{
1734 unsigned int i;
1735
1736 /* TODO: invert and add to origin */
1737 /* TODO: replace all "GCP_add_path" with this, make the other one static */
1738 GCC_check_connections ();
1739 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
1740 for (i++; i < p->length; i++)
1741 {
1742 struct CadetPeer *peer;
1743 struct CadetPeerPath *copy;
1744
1745 peer = GCP_get_short (p->peers[i], GNUNET_YES);
1746 copy = path_duplicate (p);
1747 copy->length = i + 1;
1748 GCP_add_path (peer, copy, 3 > p->length ? GNUNET_NO : confirmed);
1749 }
1750 GCC_check_connections ();
1751}
1752
1753
1754/**
1755 * Remove any path to the peer that has the exact same peers as the one given.
1756 *
1757 * @param peer Peer to remove the path from.
1758 * @param path Path to remove. Is always destroyed .
1759 */
1760void
1761GCP_remove_path (struct CadetPeer *peer,
1762 struct CadetPeerPath *path)
1763{
1764 struct CadetPeerPath *iter;
1765 struct CadetPeerPath *next;
1766
1767 GCC_check_connections ();
1768 GNUNET_assert (myid == path->peers[0]);
1769 GNUNET_assert (peer->id == path->peers[path->length - 1]);
1770
1771 LOG (GNUNET_ERROR_TYPE_INFO,
1772 "Removing path %p (%u) from %s\n",
1773 path, path->length, GCP_2s (peer));
1774
1775 for (iter = peer->path_head; NULL != iter; iter = next)
1776 {
1777 next = iter->next;
1778 if (0 == path_cmp (path, iter))
1779 {
1780 GNUNET_CONTAINER_DLL_remove (peer->path_head,
1781 peer->path_tail,
1782 iter);
1783 if (iter != path)
1784 path_destroy (iter);
1785 }
1786 }
1787 path_destroy (path);
1788 GCC_check_connections ();
1789}
1790
1791
1792/**
1793 * Check that we are aware of a connection from a neighboring peer.
1794 *
1795 * @param peer Peer to the connection is with
1796 * @param c Connection that should be in the map with this peer.
1797 */
1798void
1799GCP_check_connection (const struct CadetPeer *peer,
1800 const struct CadetConnection *c)
1801{
1802 GNUNET_assert (NULL != peer);
1803 GNUNET_assert (NULL != peer->connections);
1804 return; // ????
1805 GNUNET_assert (GNUNET_YES ==
1806 GNUNET_CONTAINER_multishortmap_contains_value (peer->connections,
1807 &GCC_get_id (c)->connection_of_tunnel,
1808 c));
1809}
1810
1811
1812/**
1813 * Remove a connection from a neighboring peer.
1814 *
1815 * @param peer Peer to remove connection from.
1816 * @param c Connection to remove.
1817 */
1818void
1819GCP_remove_connection (struct CadetPeer *peer,
1820 const struct CadetConnection *c)
1821{
1822 LOG (GNUNET_ERROR_TYPE_DEBUG,
1823 "Removing connection %s\n",
1824 GCC_2s (c));
1825 LOG (GNUNET_ERROR_TYPE_DEBUG,
1826 "from peer %s\n",
1827 GCP_2s (peer));
1828 if ( (NULL == peer) ||
1829 (NULL == peer->connections) )
1830 return;
1831 GNUNET_assert (GNUNET_YES ==
1832 GNUNET_CONTAINER_multishortmap_remove (peer->connections,
1833 &GCC_get_id (c)->connection_of_tunnel,
1834 c));
1835 LOG (GNUNET_ERROR_TYPE_DEBUG,
1836 "Peer %s remains with %u connections.\n",
1837 GCP_2s (peer),
1838 GNUNET_CONTAINER_multishortmap_size (peer->connections));
1839}
1840
1841
1842/**
1843 * Start the DHT search for new paths towards the peer: we don't have
1844 * enough good connections.
1845 *
1846 * @param peer Destination peer.
1847 */
1848void
1849GCP_start_search (struct CadetPeer *peer)
1850{
1851 const struct GNUNET_PeerIdentity *id;
1852 struct CadetTunnel *t = peer->tunnel;
1853
1854 GCC_check_connections ();
1855 if (NULL != peer->search_h)
1856 {
1857 GNUNET_break (0);
1858 return;
1859 }
1860
1861 if (NULL != peer->search_delayed)
1862 GCP_stop_search (peer);
1863
1864 id = GNUNET_PEER_resolve2 (peer->id);
1865 peer->search_h = GCD_search (id, &search_handler, peer);
1866
1867 if (NULL == t)
1868 {
1869 /* Why would we search for a peer with no tunnel towards it? */
1870 GNUNET_break (0);
1871 return;
1872 }
1873
1874 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
1875 || 0 == GCT_count_any_connections (t))
1876 {
1877 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
1878 }
1879 GCC_check_connections ();
1880}
1881
1882
1883/**
1884 * Stop the DHT search for new paths towards the peer: we already have
1885 * enough good connections.
1886 *
1887 * @param peer Destination peer.
1888 */
1889void
1890GCP_stop_search (struct CadetPeer *peer)
1891{
1892 GCC_check_connections ();
1893 if (NULL != peer->search_h)
1894 {
1895 GCD_search_stop (peer->search_h);
1896 peer->search_h = NULL;
1897 }
1898 if (NULL != peer->search_delayed)
1899 {
1900 GNUNET_SCHEDULER_cancel (peer->search_delayed);
1901 peer->search_delayed = NULL;
1902 }
1903 GCC_check_connections ();
1904}
1905
1906
1907/**
1908 * Get the Full ID of a peer.
1909 *
1910 * @param peer Peer to get from.
1911 *
1912 * @return Full ID of peer.
1913 */
1914const struct GNUNET_PeerIdentity *
1915GCP_get_id (const struct CadetPeer *peer)
1916{
1917 return GNUNET_PEER_resolve2 (peer->id);
1918}
1919
1920
1921/**
1922 * Get the Short ID of a peer.
1923 *
1924 * @param peer Peer to get from.
1925 *
1926 * @return Short ID of peer.
1927 */
1928GNUNET_PEER_Id
1929GCP_get_short_id (const struct CadetPeer *peer)
1930{
1931 return peer->id;
1932}
1933
1934
1935/**
1936 * Set tunnel.
1937 *
1938 * If tunnel is NULL and there was a search active, stop it, as it's useless.
1939 *
1940 * @param peer Peer.
1941 * @param t Tunnel.
1942 */
1943void
1944GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
1945{
1946 peer->tunnel = t;
1947 if (NULL == t && GNUNET_YES == is_searching (peer))
1948 {
1949 GCP_stop_search (peer);
1950 }
1951}
1952
1953
1954/**
1955 * Get the tunnel towards a peer.
1956 *
1957 * @param peer Peer to get from.
1958 *
1959 * @return Tunnel towards peer.
1960 */
1961struct CadetTunnel *
1962GCP_get_tunnel (const struct CadetPeer *peer)
1963{
1964 if (NULL == peer)
1965 return NULL;
1966 return peer->tunnel;
1967}
1968
1969
1970/**
1971 * Set the hello message.
1972 *
1973 * @param peer Peer whose message to set.
1974 * @param hello Hello message.
1975 */
1976void
1977GCP_set_hello (struct CadetPeer *peer,
1978 const struct GNUNET_HELLO_Message *hello)
1979{
1980 struct GNUNET_HELLO_Message *old;
1981 size_t size;
1982
1983 GCC_check_connections ();
1984 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
1985 if (NULL == hello)
1986 return;
1987
1988 old = GCP_get_hello (peer);
1989 if (NULL == old)
1990 {
1991 size = GNUNET_HELLO_size (hello);
1992 peer->hello = GNUNET_malloc (size);
1993 GNUNET_memcpy (peer->hello, hello, size);
1994 }
1995 else
1996 {
1997 peer->hello = GNUNET_HELLO_merge (old, hello);
1998 GNUNET_free (old);
1999 }
2000 GCC_check_connections ();
2001}
2002
2003
2004/**
2005 * Get the hello message.
2006 *
2007 * @param peer Peer whose message to get.
2008 *
2009 * @return Hello message.
2010 */
2011struct GNUNET_HELLO_Message *
2012GCP_get_hello (struct CadetPeer *peer)
2013{
2014 struct GNUNET_TIME_Absolute expiration;
2015 struct GNUNET_TIME_Relative remaining;
2016
2017 if (NULL == peer->hello)
2018 return NULL;
2019
2020 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2021 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2022 if (0 == remaining.rel_value_us)
2023 {
2024 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2025 GNUNET_STRINGS_absolute_time_to_string (expiration));
2026 GNUNET_free (peer->hello);
2027 peer->hello = NULL;
2028 }
2029 return peer->hello;
2030}
2031
2032
2033/**
2034 * Try to connect to a peer on TRANSPORT level.
2035 *
2036 * @param peer Peer to whom to connect.
2037 */
2038void
2039GCP_try_connect (struct CadetPeer *peer)
2040{
2041 struct GNUNET_HELLO_Message *hello;
2042 struct GNUNET_MessageHeader *mh;
2043
2044 if (GNUNET_YES !=
2045 GNUNET_CONFIGURATION_get_value_yesno (cfg,
2046 "CADET",
2047 "DISABLE_TRY_CONNECT"))
2048 return;
2049 GCC_check_connections ();
2050 if (GNUNET_YES == GCP_is_neighbor (peer))
2051 return;
2052 hello = GCP_get_hello (peer);
2053 if (NULL == hello)
2054 return;
2055
2056 mh = GNUNET_HELLO_get_header (hello);
2057 if (NULL != peer->hello_offer)
2058 {
2059 GNUNET_TRANSPORT_offer_hello_cancel (peer->hello_offer);
2060 peer->hello_offer = NULL;
2061 }
2062 peer->hello_offer = GNUNET_TRANSPORT_offer_hello (cfg,
2063 mh,
2064 &hello_offer_done,
2065 peer);
2066 if (NULL == peer->connectivity_suggestion)
2067 peer->connectivity_suggestion
2068 = GNUNET_ATS_connectivity_suggest (ats_ch,
2069 GCP_get_id (peer),
2070 1); /* strength */
2071 GCC_check_connections ();
2072}
2073
2074
2075/**
2076 * Notify a peer that a link between two other peers is broken. If any path
2077 * used that link, eliminate it.
2078 *
2079 * @param peer Peer affected by the change.
2080 * @param peer1 Peer whose link is broken.
2081 * @param peer2 Peer whose link is broken.
2082 */
2083void
2084GCP_notify_broken_link (struct CadetPeer *peer,
2085 const struct GNUNET_PeerIdentity *peer1,
2086 const struct GNUNET_PeerIdentity *peer2)
2087{
2088 struct CadetPeerPath *iter;
2089 struct CadetPeerPath *next;
2090 unsigned int i;
2091 GNUNET_PEER_Id p1;
2092 GNUNET_PEER_Id p2;
2093
2094 GCC_check_connections ();
2095 p1 = GNUNET_PEER_search (peer1);
2096 p2 = GNUNET_PEER_search (peer2);
2097
2098 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2099 if (0 == p1 || 0 == p2)
2100 {
2101 /* We don't even know them */
2102 return;
2103 }
2104
2105 for (iter = peer->path_head; NULL != iter; iter = next)
2106 {
2107 next = iter->next;
2108 for (i = 0; i < iter->length - 1; i++)
2109 {
2110 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2111 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2112 {
2113 char *s;
2114
2115 s = path_2s (iter);
2116 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2117 GNUNET_free (s);
2118
2119 path_invalidate (iter);
2120 }
2121 }
2122 }
2123 GCC_check_connections ();
2124}
2125
2126
2127/**
2128 * Count the number of known paths toward the peer.
2129 *
2130 * @param peer Peer to get path info.
2131 *
2132 * @return Number of known paths.
2133 */
2134unsigned int
2135GCP_count_paths (const struct CadetPeer *peer)
2136{
2137 struct CadetPeerPath *iter;
2138 unsigned int i;
2139
2140 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2141 i++;
2142
2143 return i;
2144}
2145
2146
2147/**
2148 * Iterate over the paths to a peer.
2149 *
2150 * @param peer Peer to get path info.
2151 * @param callback Function to call for every path.
2152 * @param cls Closure for @a callback.
2153 *
2154 * @return Number of iterated paths.
2155 */
2156unsigned int
2157GCP_iterate_paths (struct CadetPeer *peer,
2158 GCP_path_iterator callback,
2159 void *cls)
2160{
2161 struct CadetPeerPath *iter;
2162 unsigned int i;
2163
2164 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2165 {
2166 i++;
2167 if (GNUNET_YES != callback (cls, peer, iter))
2168 break;
2169 }
2170
2171 return i;
2172}
2173
2174
2175/**
2176 * Iterate all known peers.
2177 *
2178 * @param iter Iterator.
2179 * @param cls Closure for @c iter.
2180 */
2181void
2182GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2183 void *cls)
2184{
2185 GCC_check_connections ();
2186 GNUNET_CONTAINER_multipeermap_iterate (peers,
2187 iter,
2188 cls);
2189 GCC_check_connections ();
2190}
2191
2192
2193/**
2194 * Get the static string for a peer ID.
2195 *
2196 * @param peer Peer.
2197 *
2198 * @return Static string for it's ID.
2199 */
2200const char *
2201GCP_2s (const struct CadetPeer *peer)
2202{
2203 if (NULL == peer)
2204 return "(NULL)";
2205 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2206}
2207
2208
2209/* end of gnunet-service-cadet_peer.c */
diff --git a/src/cadet/gnunet-service-cadet_peer.h b/src/cadet/gnunet-service-cadet_peer.h
deleted file mode 100644
index 1e206e10f..000000000
--- a/src/cadet/gnunet-service-cadet_peer.h
+++ /dev/null
@@ -1,483 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_peer.h
23 * @brief cadet service; dealing with remote peers
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMP (Gnunet Cadet Peer)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_PEER_H
30#define GNUNET_SERVICE_CADET_PEER_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42#include "cadet_path.h"
43
44/**
45 * Struct containing all information regarding a given peer
46 */
47struct CadetPeer;
48
49/**
50 * Handle to queued messages on a peer level.
51 */
52struct CadetPeerQueue;
53
54#include "gnunet-service-cadet_connection.h"
55
56
57/**
58 * Callback called when a queued message is sent.
59 *
60 * @param cls Closure.
61 * @param c Connection this message was on.
62 * @param fwd Was this a FWD going message?
63 * @param sent Was it really sent? (Could have been canceled)
64 * @param type Type of message sent.
65 * @param payload_type Type of payload, if applicable.
66 * @param pid Message ID, or 0 if not applicable (create, destroy, etc).
67 * @param size Size of the message.
68 * @param wait Time spent waiting for core (only the time for THIS message)
69 */
70typedef void
71(*GCP_sent) (void *cls,
72 struct CadetConnection *c,
73 int fwd,
74 int sent,
75 uint16_t type,
76 uint16_t payload_type,
77 struct CadetEncryptedMessageIdentifier pid,
78 size_t size,
79 struct GNUNET_TIME_Relative wait);
80
81/**
82 * Peer path iterator.
83 *
84 * @param cls Closure.
85 * @param peer Peer this path is towards.
86 * @param path Path itself
87 * @return #GNUNET_YES if should keep iterating.
88 * #GNUNET_NO otherwise.
89 */
90typedef int
91(*GCP_path_iterator) (void *cls,
92 struct CadetPeer *peer,
93 struct CadetPeerPath *path);
94
95
96/******************************************************************************/
97/******************************** API ***********************************/
98/******************************************************************************/
99
100/**
101 * Initialize peer subsystem.
102 *
103 * @param c Configuration.
104 */
105void
106GCP_init (const struct GNUNET_CONFIGURATION_Handle *c);
107
108/**
109 * Shut down the peer subsystem.
110 */
111void
112GCP_shutdown (void);
113
114
115/**
116 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
117 * one and insert it in the appropriate structures if the peer is not known yet.
118 *
119 * @param peer_id Full identity of the peer.
120 * @param create #GNUNET_YES if a new peer should be created if unknown.
121 * #GNUNET_NO otherwise.
122 *
123 * @return Existing or newly created peer structure.
124 * NULL if unknown and not requested @a create
125 */
126struct CadetPeer *
127GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create);
128
129
130/**
131 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
132 * one and insert it in the appropriate structures if the peer is not known yet.
133 *
134 * @param peer Short identity of the peer.
135 * @param create #GNUNET_YES if a new peer should be created if unknown.
136 * #GNUNET_NO otherwise.
137 *
138 * @return Existing or newly created peer structure.
139 * NULL if unknown and not requested @a create
140 */
141struct CadetPeer *
142GCP_get_short (const GNUNET_PEER_Id peer, int create);
143
144
145/**
146 * Try to establish a new connection to this peer (in its tunnel).
147 * If the peer doesn't have any path to it yet, try to get one.
148 * If the peer already has some path, send a CREATE CONNECTION towards it.
149 *
150 * @param peer Peer to connect to.
151 */
152void
153GCP_connect (struct CadetPeer *peer);
154
155/**
156 * @brief Send a message to another peer (using CORE).
157 *
158 * @param peer Peer towards which to queue the message.
159 * @param message Message to send.
160 * @param payload_type Type of the message's payload, for debug messages.
161 * 0 if the message is a retransmission (unknown payload).
162 * UINT16_MAX if the message does not have payload.
163 * @param payload_id ID of the payload (MID, ACK #, etc)
164 * @param c Connection this message belongs to (can be NULL).
165 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
166 * @param cont Continuation to be called once CORE has sent the message.
167 * @param cont_cls Closure for @c cont.
168 */
169struct CadetPeerQueue *
170GCP_send (struct CadetPeer *peer,
171 const struct GNUNET_MessageHeader *message,
172 uint16_t payload_type,
173 struct CadetEncryptedMessageIdentifier payload_id,
174 struct CadetConnection *c,
175 int fwd,
176 GCP_sent cont,
177 void *cont_cls);
178
179/**
180 * Cancel sending a message. Message must have been sent with
181 * #GCP_send before. May not be called after the notify sent
182 * callback has been called.
183 *
184 * It does NOT call the continuation given to #GCP_send.
185 *
186 * @param q Queue handle to cancel
187 */
188void
189GCP_send_cancel (struct CadetPeerQueue *q);
190
191/**
192 * Set tunnel.
193 *
194 * @param peer Peer.
195 * @param t Tunnel.
196 */
197void
198GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t);
199
200
201/**
202 * Check whether there is a direct (core level) connection to peer.
203 *
204 * @param peer Peer to check.
205 *
206 * @return #GNUNET_YES if there is a direct connection.
207 */
208int
209GCP_is_neighbor (const struct CadetPeer *peer);
210
211
212/**
213 * Create and initialize a new tunnel towards a peer, in case it has none.
214 *
215 * Does not generate any traffic, just creates the local data structures.
216 *
217 * @param peer Peer towards which to create the tunnel.
218 */
219void
220GCP_add_tunnel (struct CadetPeer *peer);
221
222
223/**
224 * Add a connection to a neighboring peer.
225 *
226 * Store that the peer is the first hop of the connection in one
227 * direction and that on peer disconnect the connection must be
228 * notified and destroyed, for it will no longer be valid.
229 *
230 * @param peer Peer to add connection to.
231 * @param c Connection to add.
232 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
233 */
234void
235GCP_add_connection (struct CadetPeer *peer,
236 struct CadetConnection *c,
237 int pred);
238
239
240/**
241 * Add the path to the peer and update the path used to reach it in case this
242 * is the shortest.
243 *
244 * @param peer Destination peer to add the path to.
245 * @param path New path to add. Last peer must be the peer in arg 1.
246 * Path will be either used of freed if already known.
247 * @param trusted Do we trust that this path is real?
248 *
249 * @return path if path was taken, pointer to existing duplicate if exists
250 * NULL on error.
251 */
252struct CadetPeerPath *
253GCP_add_path (struct CadetPeer *peer,
254 struct CadetPeerPath *p,
255 int trusted);
256
257
258/**
259 * Add the path to the origin peer and update the path used to reach it in case
260 * this is the shortest.
261 * The path is given in peer_info -> destination, therefore we turn the path
262 * upside down first.
263 *
264 * @param peer Peer to add the path to, being the origin of the path.
265 * @param path New path to add after being inversed.
266 * Path will be either used or freed.
267 * @param trusted Do we trust that this path is real?
268 *
269 * @return path if path was taken, pointer to existing duplicate if exists
270 * NULL on error.
271 */
272struct CadetPeerPath *
273GCP_add_path_to_origin (struct CadetPeer *peer,
274 struct CadetPeerPath *path,
275 int trusted);
276
277/**
278 * Adds a path to the info of all the peers in the path
279 *
280 * @param p Path to process.
281 * @param confirmed Whether we know if the path works or not.
282 */
283void
284GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed);
285
286
287/**
288 * Remove any path to the peer that has the extact same peers as the one given.
289 *
290 * @param peer Peer to remove the path from.
291 * @param path Path to remove. Is always destroyed .
292 */
293void
294GCP_remove_path (struct CadetPeer *peer,
295 struct CadetPeerPath *path);
296
297
298/**
299 * Check that we are aware of a connection from a neighboring peer.
300 *
301 * @param peer Peer to the connection is with
302 * @param c Connection that should be in the map with this peer.
303 */
304void
305GCP_check_connection (const struct CadetPeer *peer,
306 const struct CadetConnection *c);
307
308
309/**
310 * Remove a connection from a neighboring peer.
311 *
312 * @param peer Peer to remove connection from.
313 * @param c Connection to remove.
314 */
315void
316GCP_remove_connection (struct CadetPeer *peer,
317 const struct CadetConnection *c);
318
319
320/**
321 * Start the DHT search for new paths towards the peer: we don't have
322 * enough good connections.
323 *
324 * @param peer Destination peer.
325 */
326void
327GCP_start_search (struct CadetPeer *peer);
328
329
330/**
331 * Stop the DHT search for new paths towards the peer: we already have
332 * enough good connections.
333 *
334 * @param peer Destination peer.
335 */
336void
337GCP_stop_search (struct CadetPeer *peer);
338
339
340/**
341 * Get the Full ID of a peer.
342 *
343 * @param peer Peer to get from.
344 *
345 * @return Full ID of peer.
346 */
347const struct GNUNET_PeerIdentity *
348GCP_get_id (const struct CadetPeer *peer);
349
350
351/**
352 * Get the Short ID of a peer.
353 *
354 * @param peer Peer to get from.
355 *
356 * @return Short ID of peer.
357 */
358GNUNET_PEER_Id
359GCP_get_short_id (const struct CadetPeer *peer);
360
361
362/**
363 * Get the tunnel towards a peer.
364 *
365 * @param peer Peer to get from.
366 *
367 * @return Tunnel towards peer.
368 */
369struct CadetTunnel *
370GCP_get_tunnel (const struct CadetPeer *peer);
371
372
373/**
374 * Set the hello message.
375 *
376 * @param peer Peer whose message to set.
377 * @param hello Hello message.
378 */
379void
380GCP_set_hello (struct CadetPeer *peer,
381 const struct GNUNET_HELLO_Message *hello);
382
383
384/**
385 * Get the hello message.
386 *
387 * @param peer Peer whose message to get.
388 *
389 * @return Hello message.
390 */
391struct GNUNET_HELLO_Message *
392GCP_get_hello (struct CadetPeer *peer);
393
394
395/**
396 * Try to connect to a peer on TRANSPORT level.
397 *
398 * @param peer Peer to whom to connect.
399 */
400void
401GCP_try_connect (struct CadetPeer *peer);
402
403/**
404 * Notify a peer that a link between two other peers is broken. If any path
405 * used that link, eliminate it.
406 *
407 * @param peer Peer affected by the change.
408 * @param peer1 Peer whose link is broken.
409 * @param peer2 Peer whose link is broken.
410 */
411void
412GCP_notify_broken_link (struct CadetPeer *peer,
413 const struct GNUNET_PeerIdentity *peer1,
414 const struct GNUNET_PeerIdentity *peer2);
415
416
417/**
418 * Count the number of known paths toward the peer.
419 *
420 * @param peer Peer to get path info.
421 *
422 * @return Number of known paths.
423 */
424unsigned int
425GCP_count_paths (const struct CadetPeer *peer);
426
427/**
428 * Iterate over the paths to a peer.
429 *
430 * @param peer Peer to get path info.
431 * @param callback Function to call for every path.
432 * @param cls Closure for @a callback.
433 *
434 * @return Number of iterated paths.
435 */
436unsigned int
437GCP_iterate_paths (struct CadetPeer *peer,
438 GCP_path_iterator callback,
439 void *cls);
440
441
442/**
443 * Iterate all known peers.
444 *
445 * @param iter Iterator.
446 * @param cls Closure for @c iter.
447 */
448void
449GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
450 void *cls);
451
452
453/**
454 * Get the static string for a peer ID.
455 *
456 * @param peer Peer.
457 *
458 * @return Static string for it's ID.
459 */
460const char *
461GCP_2s (const struct CadetPeer *peer);
462
463
464/**
465 * Log all kinds of info about a peer.
466 *
467 * @param peer Peer.
468 */
469void
470GCP_debug (const struct CadetPeer *p,
471 enum GNUNET_ErrorType level);
472
473
474#if 0 /* keep Emacsens' auto-indent happy */
475{
476#endif
477#ifdef __cplusplus
478}
479#endif
480
481/* ifndef GNUNET_CADET_SERVICE_PEER_H */
482#endif
483/* end of gnunet-cadet-service_peer.h */
diff --git a/src/cadet/gnunet-service-cadet_tunnel.c b/src/cadet/gnunet-service-cadet_tunnel.c
deleted file mode 100644
index a94e8f4ff..000000000
--- a/src/cadet/gnunet-service-cadet_tunnel.c
+++ /dev/null
@@ -1,3501 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013, 2017 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20/**
21 * @file cadet/gnunet-service-cadet_tunnel.c
22 * @brief logical links between CADET clients
23 * @author Bartlomiej Polot
24 */
25#include "platform.h"
26#include "gnunet_util_lib.h"
27#include "gnunet_signatures.h"
28#include "gnunet_statistics_service.h"
29#include "cadet_protocol.h"
30#include "cadet_path.h"
31#include "gnunet-service-cadet_tunnel.h"
32#include "gnunet-service-cadet_connection.h"
33#include "gnunet-service-cadet_channel.h"
34#include "gnunet-service-cadet_peer.h"
35
36#define LOG(level, ...) GNUNET_log_from(level,"cadet-tun",__VA_ARGS__)
37#define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-tun",__VA_ARGS__)
38
39#define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
40
41#if !defined(GNUNET_CULL_LOGGING)
42 #define DUMP_KEYS_TO_STDERR GNUNET_YES
43#else
44 #define DUMP_KEYS_TO_STDERR GNUNET_NO
45#endif
46
47#define MIN_TUNNEL_BUFFER 8
48#define MAX_TUNNEL_BUFFER 64
49#define MAX_SKIPPED_KEYS 64
50#define MAX_KEY_GAP 256
51#define AX_HEADER_SIZE (sizeof (uint32_t) * 2\
52 + sizeof (struct GNUNET_CRYPTO_EcdhePublicKey))
53
54/******************************************************************************/
55/******************************** STRUCTS **********************************/
56/******************************************************************************/
57
58struct CadetTChannel
59{
60 struct CadetTChannel *next;
61 struct CadetTChannel *prev;
62 struct CadetChannel *ch;
63};
64
65
66/**
67 * Entry in list of connections used by tunnel, with metadata.
68 */
69struct CadetTConnection
70{
71 /**
72 * Next in DLL.
73 */
74 struct CadetTConnection *next;
75
76 /**
77 * Prev in DLL.
78 */
79 struct CadetTConnection *prev;
80
81 /**
82 * Connection handle.
83 */
84 struct CadetConnection *c;
85
86 /**
87 * Creation time, to keep oldest connection alive.
88 */
89 struct GNUNET_TIME_Absolute created;
90
91 /**
92 * Connection throughput, to keep fastest connection alive.
93 */
94 uint32_t throughput;
95};
96
97
98/**
99 * Struct to old keys for skipped messages while advancing the Axolotl ratchet.
100 */
101struct CadetTunnelSkippedKey
102{
103 /**
104 * DLL next.
105 */
106 struct CadetTunnelSkippedKey *next;
107
108 /**
109 * DLL prev.
110 */
111 struct CadetTunnelSkippedKey *prev;
112
113 /**
114 * When was this key stored (for timeout).
115 */
116 struct GNUNET_TIME_Absolute timestamp;
117
118 /**
119 * Header key.
120 */
121 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
122
123 /**
124 * Message key.
125 */
126 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
127
128 /**
129 * Key number for a given HK.
130 */
131 unsigned int Kn;
132};
133
134
135/**
136 * Axolotl data, according to https://github.com/trevp/axolotl/wiki .
137 */
138struct CadetTunnelAxolotl
139{
140 /**
141 * A (double linked) list of stored message keys and associated header keys
142 * for "skipped" messages, i.e. messages that have not been
143 * received despite the reception of more recent messages, (head).
144 */
145 struct CadetTunnelSkippedKey *skipped_head;
146
147 /**
148 * Skipped messages' keys DLL, tail.
149 */
150 struct CadetTunnelSkippedKey *skipped_tail;
151
152 /**
153 * Elements in @a skipped_head <-> @a skipped_tail.
154 */
155 unsigned int skipped;
156
157 /**
158 * 32-byte root key which gets updated by DH ratchet.
159 */
160 struct GNUNET_CRYPTO_SymmetricSessionKey RK;
161
162 /**
163 * 32-byte header key (send).
164 */
165 struct GNUNET_CRYPTO_SymmetricSessionKey HKs;
166
167 /**
168 * 32-byte header key (recv)
169 */
170 struct GNUNET_CRYPTO_SymmetricSessionKey HKr;
171
172 /**
173 * 32-byte next header key (send).
174 */
175 struct GNUNET_CRYPTO_SymmetricSessionKey NHKs;
176
177 /**
178 * 32-byte next header key (recv).
179 */
180 struct GNUNET_CRYPTO_SymmetricSessionKey NHKr;
181
182 /**
183 * 32-byte chain keys (used for forward-secrecy updating, send).
184 */
185 struct GNUNET_CRYPTO_SymmetricSessionKey CKs;
186
187 /**
188 * 32-byte chain keys (used for forward-secrecy updating, recv).
189 */
190 struct GNUNET_CRYPTO_SymmetricSessionKey CKr;
191
192 /**
193 * ECDH for key exchange (A0 / B0).
194 */
195 struct GNUNET_CRYPTO_EcdhePrivateKey *kx_0;
196
197 /**
198 * ECDH Ratchet key (send).
199 */
200 struct GNUNET_CRYPTO_EcdhePrivateKey *DHRs;
201
202 /**
203 * ECDH Ratchet key (recv).
204 */
205 struct GNUNET_CRYPTO_EcdhePublicKey DHRr;
206
207 /**
208 * Message number (reset to 0 with each new ratchet, next message to send).
209 */
210 uint32_t Ns;
211
212 /**
213 * Message number (reset to 0 with each new ratchet, next message to recv).
214 */
215 uint32_t Nr;
216
217 /**
218 * Previous message numbers (# of msgs sent under prev ratchet)
219 */
220 uint32_t PNs;
221
222 /**
223 * True (#GNUNET_YES) if we have to send a new ratchet key in next msg.
224 */
225 int ratchet_flag;
226
227 /**
228 * Number of messages recieved since our last ratchet advance.
229 * - If this counter = 0, we cannot send a new ratchet key in next msg.
230 * - If this counter > 0, we can (but don't yet have to) send a new key.
231 */
232 unsigned int ratchet_allowed;
233
234 /**
235 * Number of messages recieved since our last ratchet advance.
236 * - If this counter = 0, we cannot send a new ratchet key in next msg.
237 * - If this counter > 0, we can (but don't yet have to) send a new key.
238 */
239 unsigned int ratchet_counter;
240
241 /**
242 * When does this ratchet expire and a new one is triggered.
243 */
244 struct GNUNET_TIME_Absolute ratchet_expiration;
245};
246
247
248/**
249 * Struct containing all information regarding a tunnel to a peer.
250 */
251struct CadetTunnel
252{
253 /**
254 * Endpoint of the tunnel.
255 */
256 struct CadetPeer *peer;
257
258 /**
259 * Axolotl info.
260 */
261 struct CadetTunnelAxolotl *ax;
262
263 /**
264 * State of the tunnel connectivity.
265 */
266 enum CadetTunnelCState cstate;
267
268 /**
269 * State of the tunnel encryption.
270 */
271 enum CadetTunnelEState estate;
272
273 /**
274 * Peer's ephemeral key, to recreate @c e_key and @c d_key when own ephemeral
275 * key changes.
276 */
277 struct GNUNET_CRYPTO_EcdhePublicKey peers_ephemeral_key;
278
279 /**
280 * Encryption ("our") key. It is only "confirmed" if kx_ctx is NULL.
281 */
282 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
283
284 /**
285 * Decryption ("their") key. It is only "confirmed" if kx_ctx is NULL.
286 */
287 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
288
289 /**
290 * Task to start the rekey process.
291 */
292 struct GNUNET_SCHEDULER_Task *rekey_task;
293
294 /**
295 * Paths that are actively used to reach the destination peer.
296 */
297 struct CadetTConnection *connection_head;
298 struct CadetTConnection *connection_tail;
299
300 /**
301 * Next connection number.
302 */
303 uint32_t next_cid;
304
305 /**
306 * Channels inside this tunnel.
307 */
308 struct CadetTChannel *channel_head;
309 struct CadetTChannel *channel_tail;
310
311 /**
312 * Channel ID for the next created channel.
313 */
314 struct GNUNET_CADET_ChannelTunnelNumber next_ctn;
315
316 /**
317 * Destroy flag: if true, destroy on last message.
318 */
319 struct GNUNET_SCHEDULER_Task * destroy_task;
320
321 /**
322 * Queued messages, to transmit once tunnel gets connected.
323 */
324 struct CadetTunnelDelayed *tq_head;
325 struct CadetTunnelDelayed *tq_tail;
326
327 /**
328 * Task to trim connections if too many are present.
329 */
330 struct GNUNET_SCHEDULER_Task * trim_connections_task;
331
332 /**
333 * Ephemeral message in the queue (to avoid queueing more than one).
334 */
335 struct CadetConnectionQueue *ephm_h;
336
337 /**
338 * Pong message in the queue.
339 */
340 struct CadetConnectionQueue *pong_h;
341};
342
343
344/**
345 * Struct used to save messages in a non-ready tunnel to send once connected.
346 */
347struct CadetTunnelDelayed
348{
349 /**
350 * DLL
351 */
352 struct CadetTunnelDelayed *next;
353 struct CadetTunnelDelayed *prev;
354
355 /**
356 * Tunnel.
357 */
358 struct CadetTunnel *t;
359
360 /**
361 * Tunnel queue given to the channel to cancel request. Update on send_queued.
362 */
363 struct CadetTunnelQueue *tq;
364
365 /**
366 * Message to send.
367 */
368 /* struct GNUNET_MessageHeader *msg; */
369};
370
371
372/**
373 * Handle for messages queued but not yet sent.
374 */
375struct CadetTunnelQueue
376{
377 /**
378 * Connection queue handle, to cancel if necessary.
379 */
380 struct CadetConnectionQueue *cq;
381
382 /**
383 * Handle in case message hasn't been given to a connection yet.
384 */
385 struct CadetTunnelDelayed *tqd;
386
387 /**
388 * Continuation to call once sent.
389 */
390 GCT_sent cont;
391
392 /**
393 * Closure for @c cont.
394 */
395 void *cont_cls;
396};
397
398
399/******************************************************************************/
400/******************************* GLOBALS ***********************************/
401/******************************************************************************/
402
403/**
404 * Global handle to the statistics service.
405 */
406extern struct GNUNET_STATISTICS_Handle *stats;
407
408/**
409 * Local peer own ID (memory efficient handle).
410 */
411extern GNUNET_PEER_Id myid;
412
413/**
414 * Local peer own ID (full value).
415 */
416extern struct GNUNET_PeerIdentity my_full_id;
417
418
419/**
420 * Don't try to recover tunnels if shutting down.
421 */
422extern int shutting_down;
423
424
425/**
426 * Set of all tunnels, in order to trigger a new exchange on rekey.
427 * Indexed by peer's ID.
428 */
429static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
430
431/**
432 * Own Peer ID private key.
433 */
434const static struct GNUNET_CRYPTO_EddsaPrivateKey *id_key;
435
436
437/******************************** AXOLOTL ************************************/
438
439/**
440 * How many messages are needed to trigger a ratchet advance.
441 */
442static unsigned long long ratchet_messages;
443
444/**
445 * How long until we trigger a ratched advance.
446 */
447static struct GNUNET_TIME_Relative ratchet_time;
448
449
450/******************************************************************************/
451/******************************** STATIC ***********************************/
452/******************************************************************************/
453
454/**
455 * Get string description for tunnel connectivity state.
456 *
457 * @param cs Tunnel state.
458 *
459 * @return String representation.
460 */
461static const char *
462cstate2s (enum CadetTunnelCState cs)
463{
464 static char buf[32];
465
466 switch (cs)
467 {
468 case CADET_TUNNEL_NEW:
469 return "CADET_TUNNEL_NEW";
470 case CADET_TUNNEL_SEARCHING:
471 return "CADET_TUNNEL_SEARCHING";
472 case CADET_TUNNEL_WAITING:
473 return "CADET_TUNNEL_WAITING";
474 case CADET_TUNNEL_READY:
475 return "CADET_TUNNEL_READY";
476 case CADET_TUNNEL_SHUTDOWN:
477 return "CADET_TUNNEL_SHUTDOWN";
478 default:
479 SPRINTF (buf, "%u (UNKNOWN STATE)", cs);
480 return buf;
481 }
482 return "";
483}
484
485
486/**
487 * Get string description for tunnel encryption state.
488 *
489 * @param es Tunnel state.
490 *
491 * @return String representation.
492 */
493static const char *
494estate2s (enum CadetTunnelEState es)
495{
496 static char buf[32];
497
498 switch (es)
499 {
500 case CADET_TUNNEL_KEY_UNINITIALIZED:
501 return "CADET_TUNNEL_KEY_UNINITIALIZED";
502 case CADET_TUNNEL_KEY_AX_SENT:
503 return "CADET_TUNNEL_KEY_AX_SENT";
504 case CADET_TUNNEL_KEY_AX_AUTH_SENT:
505 return "CADET_TUNNEL_KEY_AX_AUTH_SENT";
506 case CADET_TUNNEL_KEY_OK:
507 return "CADET_TUNNEL_KEY_OK";
508 case CADET_TUNNEL_KEY_REKEY:
509 return "CADET_TUNNEL_KEY_REKEY";
510 default:
511 SPRINTF (buf, "%u (UNKNOWN STATE)", es);
512 return buf;
513 }
514 return "";
515}
516
517
518/**
519 * @brief Check if tunnel is ready to send traffic.
520 *
521 * Tunnel must be connected and with encryption correctly set up.
522 *
523 * @param t Tunnel to check.
524 *
525 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
526 */
527static int
528is_ready (struct CadetTunnel *t)
529{
530 int ready;
531 int conn_ok;
532 int enc_ok;
533
534 conn_ok = CADET_TUNNEL_READY == t->cstate;
535 enc_ok = CADET_TUNNEL_KEY_OK == t->estate
536 || CADET_TUNNEL_KEY_REKEY == t->estate
537 || CADET_TUNNEL_KEY_AX_AUTH_SENT == t->estate;
538 ready = conn_ok && enc_ok;
539 ready = ready || GCT_is_loopback (t);
540 return ready;
541}
542
543
544/**
545 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
546 *
547 * @param tch Tunnel's channel handle.
548 *
549 * @return Amount of messages the channel can still buffer towards the client.
550 */
551static unsigned int
552get_channel_buffer (const struct CadetTChannel *tch)
553{
554 int fwd;
555
556 /* If channel is incoming, is terminal in the FWD direction and fwd is YES */
557 fwd = GCCH_is_terminal (tch->ch, GNUNET_YES);
558
559 return GCCH_get_buffer (tch->ch, fwd);
560}
561
562
563/**
564 * Get the channel's allowance status.
565 *
566 * @param tch Tunnel's channel handle.
567 *
568 * @return #GNUNET_YES if we allowed the client to send data to us.
569 */
570static int
571get_channel_allowed (const struct CadetTChannel *tch)
572{
573 int fwd;
574
575 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
576 fwd = GCCH_is_origin (tch->ch, GNUNET_YES);
577
578 return GCCH_get_allowed (tch->ch, fwd);
579}
580
581
582/**
583 * Get the connection's buffer.
584 *
585 * @param tc Tunnel's connection handle.
586 *
587 * @return Amount of messages the connection can still buffer.
588 */
589static unsigned int
590get_connection_buffer (const struct CadetTConnection *tc)
591{
592 int fwd;
593
594 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
595 fwd = GCC_is_origin (tc->c, GNUNET_YES);
596
597 return GCC_get_buffer (tc->c, fwd);
598}
599
600
601/**
602 * Get the connection's allowance.
603 *
604 * @param tc Tunnel's connection handle.
605 *
606 * @return Amount of messages we have allowed the next peer to send us.
607 */
608static unsigned int
609get_connection_allowed (const struct CadetTConnection *tc)
610{
611 int fwd;
612
613 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
614 fwd = GCC_is_origin (tc->c, GNUNET_YES);
615
616 return GCC_get_allowed (tc->c, fwd);
617}
618
619
620/**
621 * Create a new Axolotl ephemeral (ratchet) key.
622 *
623 * @param t Tunnel.
624 */
625static void
626new_ephemeral (struct CadetTunnel *t)
627{
628 GNUNET_free_non_null (t->ax->DHRs);
629 t->ax->DHRs = GNUNET_CRYPTO_ecdhe_key_create();
630 #if DUMP_KEYS_TO_STDERR
631 {
632 struct GNUNET_CRYPTO_EcdhePublicKey pub;
633 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &pub);
634 LOG (GNUNET_ERROR_TYPE_DEBUG, " new DHRs generated: pub %s\n",
635 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &pub));
636 }
637 #endif
638}
639
640
641/**
642 * Calculate HMAC.
643 *
644 * @param plaintext Content to HMAC.
645 * @param size Size of @c plaintext.
646 * @param iv Initialization vector for the message.
647 * @param key Key to use.
648 * @param hmac[out] Destination to store the HMAC.
649 */
650static void
651t_hmac (const void *plaintext, size_t size,
652 uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
653 struct GNUNET_ShortHashCode *hmac)
654{
655 static const char ctx[] = "cadet authentication key";
656 struct GNUNET_CRYPTO_AuthKey auth_key;
657 struct GNUNET_HashCode hash;
658
659#if DUMP_KEYS_TO_STDERR
660 LOG (GNUNET_ERROR_TYPE_INFO, " HMAC %u bytes with key %s\n", size,
661 GNUNET_i2s ((struct GNUNET_PeerIdentity *) key));
662#endif
663 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
664 &iv, sizeof (iv),
665 key, sizeof (*key),
666 ctx, sizeof (ctx),
667 NULL);
668 /* Two step: CADET_Hash is only 256 bits, HashCode is 512. */
669 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
670 GNUNET_memcpy (hmac, &hash, sizeof (*hmac));
671}
672
673
674/**
675 * Perform a HMAC.
676 *
677 * @param key Key to use.
678 * @param hash[out] Resulting HMAC.
679 * @param source Source key material (data to HMAC).
680 * @param len Length of @a source.
681 */
682static void
683t_ax_hmac_hash (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
684 struct GNUNET_HashCode *hash,
685 void *source, unsigned int len)
686{
687 static const char ctx[] = "axolotl HMAC-HASH";
688 struct GNUNET_CRYPTO_AuthKey auth_key;
689
690 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
691 ctx, sizeof (ctx),
692 NULL);
693 GNUNET_CRYPTO_hmac (&auth_key, source, len, hash);
694}
695
696
697/**
698 * Derive a key from a HMAC-HASH.
699 *
700 * @param key Key to use for the HMAC.
701 * @param out Key to generate.
702 * @param source Source key material (data to HMAC).
703 * @param len Length of @a source.
704 */
705static void
706t_hmac_derive_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
707 struct GNUNET_CRYPTO_SymmetricSessionKey *out,
708 void *source, unsigned int len)
709{
710 static const char ctx[] = "axolotl derive key";
711 struct GNUNET_HashCode h;
712
713 t_ax_hmac_hash (key, &h, source, len);
714 GNUNET_CRYPTO_kdf (out, sizeof (*out), ctx, sizeof (ctx),
715 &h, sizeof (h), NULL);
716}
717
718
719/**
720 * Encrypt data with the axolotl tunnel key.
721 *
722 * @param t Tunnel whose key to use.
723 * @param dst Destination for the encrypted data.
724 * @param src Source of the plaintext. Can overlap with @c dst.
725 * @param size Size of the plaintext.
726 *
727 * @return Size of the encrypted data.
728 */
729static int
730t_ax_encrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
731{
732 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
733 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
734 struct CadetTunnelAxolotl *ax;
735 size_t out_size;
736
737 CADET_TIMING_START;
738
739 ax = t->ax;
740 ax->ratchet_counter++;
741 if (GNUNET_YES == ax->ratchet_allowed
742 && (ratchet_messages <= ax->ratchet_counter
743 || 0 == GNUNET_TIME_absolute_get_remaining (ax->ratchet_expiration).rel_value_us))
744 {
745 ax->ratchet_flag = GNUNET_YES;
746 }
747
748 if (GNUNET_YES == ax->ratchet_flag)
749 {
750 /* Advance ratchet */
751 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3];
752 struct GNUNET_HashCode dh;
753 struct GNUNET_HashCode hmac;
754 static const char ctx[] = "axolotl ratchet";
755
756 new_ephemeral (t);
757 ax->HKs = ax->NHKs;
758
759 /* RK, NHKs, CKs = KDF( HMAC-HASH(RK, DH(DHRs, DHRr)) ) */
760 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, &ax->DHRr, &dh);
761 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
762 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
763 &hmac, sizeof (hmac), NULL);
764 ax->RK = keys[0];
765 ax->NHKs = keys[1];
766 ax->CKs = keys[2];
767
768 ax->PNs = ax->Ns;
769 ax->Ns = 0;
770 ax->ratchet_flag = GNUNET_NO;
771 ax->ratchet_allowed = GNUNET_NO;
772 ax->ratchet_counter = 0;
773 ax->ratchet_expiration =
774 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), ratchet_time);
775 }
776
777 t_hmac_derive_key (&ax->CKs, &MK, "0", 1);
778 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
779
780 #if DUMP_KEYS_TO_STDERR
781 LOG (GNUNET_ERROR_TYPE_DEBUG, " CKs: %s\n",
782 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKs));
783 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC with key %u: %s\n", ax->Ns,
784 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &MK));
785 #endif
786
787 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &MK, &iv, dst);
788 t_hmac_derive_key (&ax->CKs, &ax->CKs, "1", 1);
789
790 CADET_TIMING_END;
791
792 return out_size;
793}
794
795
796/**
797 * Decrypt data with the axolotl tunnel key.
798 *
799 * @param t Tunnel whose key to use.
800 * @param dst Destination for the decrypted data.
801 * @param src Source of the ciphertext. Can overlap with @c dst.
802 * @param size Size of the ciphertext.
803 *
804 * @return Size of the decrypted data.
805 */
806static int
807t_ax_decrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
808{
809 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
810 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
811 struct CadetTunnelAxolotl *ax;
812 size_t out_size;
813
814 CADET_TIMING_START;
815
816 ax = t->ax;
817
818 t_hmac_derive_key (&ax->CKr, &MK, "0", 1);
819 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
820
821 #if DUMP_KEYS_TO_STDERR
822 LOG (GNUNET_ERROR_TYPE_DEBUG, " CKr: %s\n",
823 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKr));
824 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with key %u: %s\n", ax->Nr,
825 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &MK));
826 #endif
827
828 GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
829 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, &MK, &iv, dst);
830 GNUNET_assert (out_size == size);
831
832 t_hmac_derive_key (&ax->CKr, &ax->CKr, "1", 1);
833
834 CADET_TIMING_END;
835
836 return out_size;
837}
838
839
840/**
841 * Encrypt header with the axolotl header key.
842 *
843 * @param t Tunnel whose key to use.
844 * @param msg Message whose header to encrypt.
845 */
846static void
847t_h_encrypt (struct CadetTunnel *t, struct GNUNET_CADET_TunnelEncryptedMessage *msg)
848{
849 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
850 struct CadetTunnelAxolotl *ax;
851 size_t out_size;
852
853 CADET_TIMING_START;
854 ax = t->ax;
855 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKs, NULL, 0, NULL);
856
857 #if DUMP_KEYS_TO_STDERR
858 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC_H with key %s\n",
859 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKs));
860 #endif
861
862 out_size = GNUNET_CRYPTO_symmetric_encrypt (&msg->Ns, AX_HEADER_SIZE,
863 &ax->HKs, &iv, &msg->Ns);
864
865 GNUNET_assert (AX_HEADER_SIZE == out_size);
866 CADET_TIMING_END;
867}
868
869
870/**
871 * Decrypt header with the current axolotl header key.
872 *
873 * @param t Tunnel whose current ax HK to use.
874 * @param src Message whose header to decrypt.
875 * @param dst Where to decrypt header to.
876 */
877static void
878t_h_decrypt (struct CadetTunnel *t, const struct GNUNET_CADET_TunnelEncryptedMessage *src,
879 struct GNUNET_CADET_TunnelEncryptedMessage *dst)
880{
881 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
882 struct CadetTunnelAxolotl *ax;
883 size_t out_size;
884
885 CADET_TIMING_START;
886
887 ax = t->ax;
888 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKr, NULL, 0, NULL);
889
890 #if DUMP_KEYS_TO_STDERR
891 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC_H with key %s\n",
892 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKr));
893 #endif
894
895 out_size = GNUNET_CRYPTO_symmetric_decrypt (&src->Ns, AX_HEADER_SIZE,
896 &ax->HKr, &iv, &dst->Ns);
897
898 GNUNET_assert (AX_HEADER_SIZE == out_size);
899
900 CADET_TIMING_END;
901}
902
903
904/**
905 * Decrypt and verify data with the appropriate tunnel key and verify that the
906 * data has not been altered since it was sent by the remote peer.
907 *
908 * @param t Tunnel whose key to use.
909 * @param dst Destination for the plaintext.
910 * @param src Source of the message. Can overlap with @c dst.
911 * @param size Size of the message.
912 *
913 * @return Size of the decrypted data, -1 if an error was encountered.
914 */
915static int
916try_old_ax_keys (struct CadetTunnel *t, void *dst,
917 const struct GNUNET_CADET_TunnelEncryptedMessage *src, size_t size)
918{
919 struct CadetTunnelSkippedKey *key;
920 struct GNUNET_ShortHashCode *hmac;
921 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
922 struct GNUNET_CADET_TunnelEncryptedMessage plaintext_header;
923 struct GNUNET_CRYPTO_SymmetricSessionKey *valid_HK;
924 size_t esize;
925 size_t res;
926 size_t len;
927 unsigned int N;
928
929 LOG (GNUNET_ERROR_TYPE_DEBUG, "Trying old keys\n");
930 hmac = &plaintext_header.hmac;
931 esize = size - sizeof (struct GNUNET_CADET_TunnelEncryptedMessage);
932
933 /* Find a correct Header Key */
934 for (key = t->ax->skipped_head; NULL != key; key = key->next)
935 {
936 #if DUMP_KEYS_TO_STDERR
937 LOG (GNUNET_ERROR_TYPE_DEBUG, " Trying hmac with key %s\n",
938 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->HK));
939 #endif
940 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &key->HK, hmac);
941 if (0 == memcmp (hmac, &src->hmac, sizeof (*hmac)))
942 {
943 LOG (GNUNET_ERROR_TYPE_DEBUG, " hmac correct\n");
944 valid_HK = &key->HK;
945 break;
946 }
947 }
948 if (NULL == key)
949 return -1;
950
951 /* Should've been checked in -cadet_connection.c handle_cadet_encrypted. */
952 GNUNET_assert (size > sizeof (struct GNUNET_CADET_TunnelEncryptedMessage));
953 len = size - sizeof (struct GNUNET_CADET_TunnelEncryptedMessage);
954 GNUNET_assert (len >= sizeof (struct GNUNET_MessageHeader));
955
956 /* Decrypt header */
957 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &key->HK, NULL, 0, NULL);
958 res = GNUNET_CRYPTO_symmetric_decrypt (&src->Ns, AX_HEADER_SIZE,
959 &key->HK, &iv, &plaintext_header.Ns);
960 GNUNET_assert (AX_HEADER_SIZE == res);
961 LOG (GNUNET_ERROR_TYPE_DEBUG, " Message %u, previous: %u\n",
962 ntohl (plaintext_header.Ns), ntohl (plaintext_header.PNs));
963
964 /* Find the correct Message Key */
965 N = ntohl (plaintext_header.Ns);
966 while (NULL != key && N != key->Kn)
967 key = key->next;
968 if (NULL == key || 0 != memcmp (&key->HK, valid_HK, sizeof (*valid_HK)))
969 return -1;
970
971 #if DUMP_KEYS_TO_STDERR
972 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC_H with skipped key %s\n",
973 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->HK));
974 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with skipped key %u: %s\n",
975 key->Kn, GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->MK));
976 #endif
977
978 /* Decrypt payload */
979 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &key->MK, NULL, 0, NULL);
980 res = GNUNET_CRYPTO_symmetric_decrypt (&src[1], len, &key->MK, &iv, dst);
981
982 /* Remove key */
983 GNUNET_CONTAINER_DLL_remove (t->ax->skipped_head, t->ax->skipped_tail, key);
984 t->ax->skipped--;
985 GNUNET_free (key); /* GNUNET_free overwrites memory with 0xbaadf00d */
986
987 return res;
988}
989
990
991/**
992 * Delete a key from the list of skipped keys.
993 *
994 * @param t Tunnel to delete from.
995 * @param HKr Header Key to use.
996 */
997static void
998store_skipped_key (struct CadetTunnel *t,
999 const struct GNUNET_CRYPTO_SymmetricSessionKey *HKr)
1000{
1001 struct CadetTunnelSkippedKey *key;
1002
1003 key = GNUNET_new (struct CadetTunnelSkippedKey);
1004 key->timestamp = GNUNET_TIME_absolute_get ();
1005 key->Kn = t->ax->Nr;
1006 key->HK = t->ax->HKr;
1007 t_hmac_derive_key (&t->ax->CKr, &key->MK, "0", 1);
1008 #if DUMP_KEYS_TO_STDERR
1009 LOG (GNUNET_ERROR_TYPE_DEBUG, " storing MK for Nr %u: %s\n",
1010 key->Kn, GNUNET_i2s ((struct GNUNET_PeerIdentity *) &key->MK));
1011 LOG (GNUNET_ERROR_TYPE_DEBUG, " for CKr: %s\n",
1012 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &t->ax->CKr));
1013 #endif
1014 t_hmac_derive_key (&t->ax->CKr, &t->ax->CKr, "1", 1);
1015 GNUNET_CONTAINER_DLL_insert (t->ax->skipped_head, t->ax->skipped_tail, key);
1016 t->ax->Nr++;
1017 t->ax->skipped++;
1018}
1019
1020
1021/**
1022 * Delete a key from the list of skipped keys.
1023 *
1024 * @param t Tunnel to delete from.
1025 * @param key Key to delete.
1026 */
1027static void
1028delete_skipped_key (struct CadetTunnel *t, struct CadetTunnelSkippedKey *key)
1029{
1030 GNUNET_CONTAINER_DLL_remove (t->ax->skipped_head, t->ax->skipped_tail, key);
1031 GNUNET_free (key);
1032 t->ax->skipped--;
1033}
1034
1035
1036/**
1037 * Stage skipped AX keys and calculate the message key.
1038 *
1039 * Stores each HK and MK for skipped messages.
1040 *
1041 * @param t Tunnel where to stage the keys.
1042 * @param HKr Header key.
1043 * @param Np Received meesage number.
1044 *
1045 * @return GNUNET_OK if keys were stored.
1046 * GNUNET_SYSERR if an error ocurred (Np not expected).
1047 */
1048static int
1049store_ax_keys (struct CadetTunnel *t,
1050 const struct GNUNET_CRYPTO_SymmetricSessionKey *HKr,
1051 uint32_t Np)
1052{
1053 int gap;
1054
1055
1056 gap = Np - t->ax->Nr;
1057 LOG (GNUNET_ERROR_TYPE_INFO, "Storing keys [%u, %u)\n", t->ax->Nr, Np);
1058 if (MAX_KEY_GAP < gap)
1059 {
1060 /* Avoid DoS (forcing peer to do 2*33 chain HMAC operations) */
1061 /* TODO: start new key exchange on return */
1062 GNUNET_break_op (0);
1063 LOG (GNUNET_ERROR_TYPE_WARNING, "Got message %u, expected %u+\n",
1064 Np, t->ax->Nr);
1065 return GNUNET_SYSERR;
1066 }
1067 if (0 > gap)
1068 {
1069 /* Delayed message: don't store keys, flag to try old keys. */
1070 return GNUNET_SYSERR;
1071 }
1072
1073 while (t->ax->Nr < Np)
1074 store_skipped_key (t, HKr);
1075
1076 while (t->ax->skipped > MAX_SKIPPED_KEYS)
1077 delete_skipped_key (t, t->ax->skipped_tail);
1078
1079 return GNUNET_OK;
1080}
1081
1082
1083/**
1084 * Decrypt and verify data with the appropriate tunnel key and verify that the
1085 * data has not been altered since it was sent by the remote peer.
1086 *
1087 * @param t Tunnel whose key to use.
1088 * @param dst Destination for the plaintext.
1089 * @param src Source of the message. Can overlap with @c dst.
1090 * @param size Size of the message.
1091 *
1092 * @return Size of the decrypted data, -1 if an error was encountered.
1093 */
1094static int
1095t_ax_decrypt_and_validate (struct CadetTunnel *t, void *dst,
1096 const struct GNUNET_CADET_TunnelEncryptedMessage *src,
1097 size_t size)
1098{
1099 struct CadetTunnelAxolotl *ax;
1100 struct GNUNET_ShortHashCode msg_hmac;
1101 struct GNUNET_HashCode hmac;
1102 struct GNUNET_CADET_TunnelEncryptedMessage plaintext_header;
1103 uint32_t Np;
1104 uint32_t PNp;
1105 size_t esize; /* Size of encryped payload */
1106 size_t osize; /* Size of output (decrypted payload) */
1107
1108 esize = size - sizeof (struct GNUNET_CADET_TunnelEncryptedMessage);
1109 ax = t->ax;
1110 if (NULL == ax)
1111 return -1;
1112
1113 /* Try current HK */
1114 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->HKr, &msg_hmac);
1115 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1116 {
1117 static const char ctx[] = "axolotl ratchet";
1118 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3]; /* RKp, NHKp, CKp */
1119 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
1120 struct GNUNET_HashCode dh;
1121 struct GNUNET_CRYPTO_EcdhePublicKey *DHRp;
1122
1123 /* Try Next HK */
1124 LOG (GNUNET_ERROR_TYPE_DEBUG, " trying next HK\n");
1125 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->NHKr, &msg_hmac);
1126 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1127 {
1128 /* Try the skipped keys, if that fails, we're out of luck. */
1129 return try_old_ax_keys (t, dst, src, size);
1130 }
1131 LOG (GNUNET_ERROR_TYPE_INFO, "next HK worked\n");
1132
1133 HK = ax->HKr;
1134 ax->HKr = ax->NHKr;
1135 t_h_decrypt (t, src, &plaintext_header);
1136 Np = ntohl (plaintext_header.Ns);
1137 PNp = ntohl (plaintext_header.PNs);
1138 DHRp = &plaintext_header.DHRs;
1139 store_ax_keys (t, &HK, PNp);
1140
1141 /* RKp, NHKp, CKp = KDF (HMAC-HASH (RK, DH (DHRp, DHRs))) */
1142 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, DHRp, &dh);
1143 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
1144 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
1145 &hmac, sizeof (hmac), NULL);
1146
1147 /* Commit "purported" keys */
1148 ax->RK = keys[0];
1149 ax->NHKr = keys[1];
1150 ax->CKr = keys[2];
1151 ax->DHRr = *DHRp;
1152 ax->Nr = 0;
1153 ax->ratchet_allowed = GNUNET_YES;
1154 }
1155 else
1156 {
1157 LOG (GNUNET_ERROR_TYPE_DEBUG, "current HK\n");
1158 t_h_decrypt (t, src, &plaintext_header);
1159 Np = ntohl (plaintext_header.Ns);
1160 PNp = ntohl (plaintext_header.PNs);
1161 }
1162 LOG (GNUNET_ERROR_TYPE_INFO, " got AX Nr %u\n", Np);
1163 if (Np != ax->Nr)
1164 if (GNUNET_OK != store_ax_keys (t, &ax->HKr, Np))
1165 /* Try the skipped keys, if that fails, we're out of luck. */
1166 return try_old_ax_keys (t, dst, src, size);
1167
1168 osize = t_ax_decrypt (t, dst, &src[1], esize);
1169 ax->Nr = Np + 1;
1170
1171 if (osize != esize)
1172 {
1173 GNUNET_break_op (0);
1174 return -1;
1175 }
1176
1177 return osize;
1178}
1179
1180
1181/**
1182 * Pick a connection on which send the next data message.
1183 *
1184 * @param t Tunnel on which to send the message.
1185 *
1186 * @return The connection on which to send the next message.
1187 */
1188static struct CadetConnection *
1189tunnel_get_connection (struct CadetTunnel *t)
1190{
1191 struct CadetTConnection *iter;
1192 struct CadetConnection *best;
1193 unsigned int qn;
1194 unsigned int lowest_q;
1195
1196 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GCT_2s (t));
1197 best = NULL;
1198 lowest_q = UINT_MAX;
1199 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1200 {
1201 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
1202 GCC_2s (iter->c), GCC_get_state (iter->c));
1203 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
1204 {
1205 qn = GCC_get_qn (iter->c, GCC_is_origin (iter->c, GNUNET_YES));
1206 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
1207 if (qn < lowest_q)
1208 {
1209 best = iter->c;
1210 lowest_q = qn;
1211 }
1212 }
1213 }
1214 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GCC_2s (best));
1215 return best;
1216}
1217
1218
1219/**
1220 * Callback called when a queued message is sent.
1221 *
1222 * Calculates the average time and connection packet tracking.
1223 *
1224 * @param cls Closure (TunnelQueue handle).
1225 * @param c Connection this message was on.
1226 * @param q Connection queue handle (unused).
1227 * @param type Type of message sent.
1228 * @param fwd Was this a FWD going message?
1229 * @param size Size of the message.
1230 */
1231static void
1232tun_message_sent (void *cls,
1233 struct CadetConnection *c,
1234 struct CadetConnectionQueue *q,
1235 uint16_t type, int fwd, size_t size)
1236{
1237 struct CadetTunnelQueue *qt = cls;
1238 struct CadetTunnel *t;
1239
1240 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
1241
1242 GNUNET_assert (NULL != qt->cont);
1243 t = NULL == c ? NULL : GCC_get_tunnel (c);
1244 qt->cont (qt->cont_cls, t, qt, type, size);
1245 GNUNET_free (qt);
1246}
1247
1248
1249static unsigned int
1250count_queued_data (const struct CadetTunnel *t)
1251{
1252 struct CadetTunnelDelayed *iter;
1253 unsigned int count;
1254
1255 for (count = 0, iter = t->tq_head; iter != NULL; iter = iter->next)
1256 count++;
1257
1258 return count;
1259}
1260
1261/**
1262 * Delete a queued message: either was sent or the channel was destroyed
1263 * before the tunnel's key exchange had a chance to finish.
1264 *
1265 * @param tqd Delayed queue handle.
1266 */
1267static void
1268unqueue_data (struct CadetTunnelDelayed *tqd)
1269{
1270 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
1271 GNUNET_free (tqd);
1272}
1273
1274
1275/**
1276 * Cache a message to be sent once tunnel is online.
1277 *
1278 * @param t Tunnel to hold the message.
1279 * @param msg Message itself (copy will be made).
1280 */
1281static struct CadetTunnelDelayed *
1282queue_data (struct CadetTunnel *t, const struct GNUNET_MessageHeader *msg)
1283{
1284 struct CadetTunnelDelayed *tqd;
1285 uint16_t size = ntohs (msg->size);
1286
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GCT_2s (t));
1288
1289 GNUNET_assert (GNUNET_NO == is_ready (t));
1290
1291 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
1292
1293 tqd->t = t;
1294 GNUNET_memcpy (&tqd[1], msg, size);
1295 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
1296 return tqd;
1297}
1298
1299
1300/**
1301 * Sends an already built message on a tunnel, encrypting it and
1302 * choosing the best connection.
1303 *
1304 * @param message Message to send. Function modifies it.
1305 * @param t Tunnel on which this message is transmitted.
1306 * @param c Connection to use (autoselect if NULL).
1307 * @param force Force the tunnel to take the message (buffer overfill).
1308 * @param cont Continuation to call once message is really sent.
1309 * @param cont_cls Closure for @c cont.
1310 * @param existing_q In case this a transmission of previously queued data,
1311 * this should be TunnelQueue given to the client.
1312 * Otherwise, NULL.
1313 * @return Handle to cancel message.
1314 * NULL if @c cont is NULL or an error happens and message is dropped.
1315 */
1316static struct CadetTunnelQueue *
1317send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1318 struct CadetTunnel *t,
1319 struct CadetConnection *c,
1320 int force,
1321 GCT_sent cont,
1322 void *cont_cls,
1323 struct CadetTunnelQueue *existing_q)
1324{
1325 struct GNUNET_MessageHeader *msg;
1326 struct GNUNET_CADET_TunnelEncryptedMessage *ax_msg;
1327 struct CadetTunnelQueue *tq;
1328 size_t size = ntohs (message->size);
1329 char cbuf[sizeof (struct GNUNET_CADET_TunnelEncryptedMessage) + size] GNUNET_ALIGN;
1330 size_t esize;
1331 uint16_t type;
1332 int fwd;
1333
1334 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GCT_2s (t));
1335
1336 if (GNUNET_NO == is_ready (t))
1337 {
1338 struct CadetTunnelDelayed *tqd;
1339 /* A non null existing_q indicates sending of queued data.
1340 * Should only happen after tunnel becomes ready.
1341 */
1342 GNUNET_assert (NULL == existing_q);
1343 tqd = queue_data (t, message);
1344 if (NULL == cont)
1345 return NULL;
1346 tq = GNUNET_new (struct CadetTunnelQueue);
1347 tq->tqd = tqd;
1348 tqd->tq = tq;
1349 tq->cont = cont;
1350 tq->cont_cls = cont_cls;
1351 return tq;
1352 }
1353
1354 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
1355
1356 ax_msg = (struct GNUNET_CADET_TunnelEncryptedMessage *) cbuf;
1357 msg = &ax_msg->header;
1358 msg->size = htons (sizeof (struct GNUNET_CADET_TunnelEncryptedMessage) + size);
1359 msg->type = htons (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_ENCRYPTED);
1360 esize = t_ax_encrypt (t, &ax_msg[1], message, size);
1361 ax_msg->Ns = htonl (t->ax->Ns++);
1362 ax_msg->PNs = htonl (t->ax->PNs);
1363 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &ax_msg->DHRs);
1364 t_h_encrypt (t, ax_msg);
1365 t_hmac (&ax_msg->Ns, AX_HEADER_SIZE + esize, 0, &t->ax->HKs, &ax_msg->hmac);
1366 GNUNET_assert (esize == size);
1367
1368 if (NULL == c)
1369 c = tunnel_get_connection (t);
1370 if (NULL == c)
1371 {
1372 /* Why is tunnel 'ready'? Should have been queued! */
1373 if (NULL != t->destroy_task)
1374 {
1375 GNUNET_break (0);
1376 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1377 }
1378 return NULL; /* Drop... */
1379 }
1380 fwd = GCC_is_origin (c, GNUNET_YES);
1381 ax_msg->cid = *GCC_get_id (c);
1382 ax_msg->cemi = GCC_get_pid (c, fwd);
1383
1384 type = htons (message->type);
1385 LOG (GNUNET_ERROR_TYPE_DEBUG,
1386 "Sending message of type %s with CEMI %u and CID %s\n",
1387 GC_m2s (type),
1388 htonl (ax_msg->cemi.pid),
1389 GNUNET_sh2s (&ax_msg->cid.connection_of_tunnel));
1390
1391 if (NULL == cont)
1392 {
1393 (void) GCC_send_prebuilt_message (msg,
1394 type,
1395 ax_msg->cemi,
1396 c,
1397 fwd,
1398 force, NULL, NULL);
1399 return NULL;
1400 }
1401 if (NULL == existing_q)
1402 {
1403 tq = GNUNET_new (struct CadetTunnelQueue); /* FIXME valgrind: leak*/
1404 }
1405 else
1406 {
1407 tq = existing_q;
1408 tq->tqd = NULL;
1409 }
1410 tq->cont = cont;
1411 tq->cont_cls = cont_cls;
1412 tq->cq = GCC_send_prebuilt_message (msg,
1413 type,
1414 ax_msg->cemi,
1415 c,
1416 fwd,
1417 force,
1418 &tun_message_sent, tq);
1419 GNUNET_assert (NULL != tq->cq);
1420
1421 return tq;
1422}
1423
1424
1425/**
1426 * Send all cached messages that we can, tunnel is online.
1427 *
1428 * @param t Tunnel that holds the messages. Cannot be loopback.
1429 */
1430static void
1431send_queued_data (struct CadetTunnel *t)
1432{
1433 struct CadetTunnelDelayed *tqd;
1434 struct CadetTunnelDelayed *next;
1435 unsigned int room;
1436
1437 LOG (GNUNET_ERROR_TYPE_INFO, "Send queued data, tunnel %s\n", GCT_2s (t));
1438
1439 if (GCT_is_loopback (t))
1440 {
1441 GNUNET_break (0);
1442 return;
1443 }
1444
1445 if (GNUNET_NO == is_ready (t))
1446 {
1447 LOG (GNUNET_ERROR_TYPE_WARNING, " not ready yet: %s/%s\n",
1448 estate2s (t->estate), cstate2s (t->cstate));
1449 return;
1450 }
1451
1452 room = GCT_get_connections_buffer (t);
1453 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
1454 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
1455 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
1456 {
1457 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
1458 next = tqd->next;
1459 room--;
1460 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
1461 tqd->t, NULL, GNUNET_YES,
1462 NULL != tqd->tq ? tqd->tq->cont : NULL,
1463 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
1464 tqd->tq);
1465 unqueue_data (tqd);
1466 }
1467 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_send_queued_data end\n", GCP_2s (t->peer));
1468}
1469
1470
1471/**
1472 * @brief Resend the KX until we complete the handshake.
1473 *
1474 * @param cls Closure (tunnel).
1475 */
1476static void
1477kx_resend (void *cls)
1478{
1479 struct CadetTunnel *t = cls;
1480
1481 t->rekey_task = NULL;
1482 if (CADET_TUNNEL_KEY_OK == t->estate)
1483 {
1484 /* Should have been canceled on estate change */
1485 GNUNET_break (0);
1486 return;
1487 }
1488
1489 GCT_send_kx (t, CADET_TUNNEL_KEY_AX_SENT >= t->estate);
1490}
1491
1492
1493/**
1494 * Callback called when a queued message is sent.
1495 *
1496 * @param cls Closure.
1497 * @param c Connection this message was on.
1498 * @param type Type of message sent.
1499 * @param fwd Was this a FWD going message?
1500 * @param size Size of the message.
1501 */
1502static void
1503ephm_sent (void *cls,
1504 struct CadetConnection *c,
1505 struct CadetConnectionQueue *q,
1506 uint16_t type, int fwd, size_t size)
1507{
1508 struct CadetTunnel *t = cls;
1509 LOG (GNUNET_ERROR_TYPE_DEBUG, "ephemeral sent %s\n", GC_m2s (type));
1510
1511 t->ephm_h = NULL;
1512
1513 if (CADET_TUNNEL_KEY_OK == t->estate)
1514 return;
1515
1516 if (NULL != t->rekey_task)
1517 {
1518 GNUNET_break (0);
1519 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1520 GNUNET_SCHEDULER_cancel (t->rekey_task);
1521 }
1522 t->rekey_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_SECONDS,
1523 &kx_resend, t);
1524
1525}
1526
1527
1528/**
1529 * Called only on shutdown, destroy every tunnel.
1530 *
1531 * @param cls Closure (unused).
1532 * @param key Current public key.
1533 * @param value Value in the hash map (tunnel).
1534 *
1535 * @return #GNUNET_YES, so we should continue to iterate,
1536 */
1537static int
1538destroy_iterator (void *cls,
1539 const struct GNUNET_PeerIdentity *key,
1540 void *value)
1541{
1542 struct CadetTunnel *t = value;
1543
1544 LOG (GNUNET_ERROR_TYPE_DEBUG,
1545 "GCT_shutdown destroying tunnel at %p\n", t);
1546 GCT_destroy (t);
1547 return GNUNET_YES;
1548}
1549
1550
1551/**
1552 * Notify remote peer that we don't know a channel he is talking about,
1553 * probably CHANNEL_DESTROY was missed.
1554 *
1555 * @param t Tunnel on which to notify.
1556 * @param gid ID of the channel.
1557 */
1558static void
1559send_channel_destroy (struct CadetTunnel *t,
1560 struct GNUNET_CADET_ChannelTunnelNumber gid)
1561{
1562 struct GNUNET_CADET_ChannelManageMessage msg;
1563
1564 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1565 msg.header.size = htons (sizeof (msg));
1566 msg.ctn = gid;
1567
1568 LOG (GNUNET_ERROR_TYPE_DEBUG,
1569 "WARNING destroying unknown channel %u on tunnel %s\n",
1570 ntohl (gid.cn),
1571 GCT_2s (t));
1572 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
1573}
1574
1575
1576/**
1577 * Demultiplex data per channel and call appropriate channel handler.
1578 *
1579 * @param t Tunnel on which the data came.
1580 * @param msg Data message.
1581 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1582 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1583 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1584 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1585 */
1586static void
1587handle_data (struct CadetTunnel *t,
1588 const struct GNUNET_CADET_ChannelAppDataMessage *msg,
1589 int fwd)
1590{
1591 struct CadetChannel *ch;
1592 char buf[128];
1593 size_t size;
1594 uint16_t type;
1595
1596 /* Check size */
1597 size = ntohs (msg->header.size);
1598 if (size <
1599 sizeof (struct GNUNET_CADET_ChannelAppDataMessage) +
1600 sizeof (struct GNUNET_MessageHeader))
1601 {
1602 GNUNET_break (0);
1603 return;
1604 }
1605 type = ntohs (msg[1].header.type);
1606 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n", GC_m2s (type));
1607 SPRINTF (buf, "# received payload of type %hu", type);
1608 GNUNET_STATISTICS_update (stats, buf, 1, GNUNET_NO);
1609
1610
1611 /* Check channel */
1612 ch = GCT_get_channel (t, msg->ctn);
1613 if (NULL == ch)
1614 {
1615 GNUNET_STATISTICS_update (stats,
1616 "# data on unknown channel",
1617 1,
1618 GNUNET_NO);
1619 LOG (GNUNET_ERROR_TYPE_DEBUG,
1620 "channel 0x%X unknown\n",
1621 ntohl (msg->ctn.cn));
1622 send_channel_destroy (t, msg->ctn);
1623 return;
1624 }
1625
1626 GCCH_handle_data (ch, msg, fwd);
1627}
1628
1629
1630/**
1631 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
1632 *
1633 * @param t Tunnel on which the DATA ACK came.
1634 * @param msg DATA ACK message.
1635 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1636 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1637 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1638 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1639 */
1640static void
1641handle_data_ack (struct CadetTunnel *t,
1642 const struct GNUNET_CADET_ChannelDataAckMessage *msg,
1643 int fwd)
1644{
1645 struct CadetChannel *ch;
1646 size_t size;
1647
1648 /* Check size */
1649 size = ntohs (msg->header.size);
1650 if (size != sizeof (struct GNUNET_CADET_ChannelDataAckMessage))
1651 {
1652 GNUNET_break (0);
1653 return;
1654 }
1655
1656 /* Check channel */
1657 ch = GCT_get_channel (t, msg->ctn);
1658 if (NULL == ch)
1659 {
1660 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
1661 1, GNUNET_NO);
1662 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
1663 ntohl (msg->ctn.cn));
1664 return;
1665 }
1666
1667 GCCH_handle_data_ack (ch, msg, fwd);
1668}
1669
1670
1671/**
1672 * Handle channel create.
1673 *
1674 * @param t Tunnel on which the message came.
1675 * @param msg ChannelCreate message.
1676 */
1677static void
1678handle_ch_create (struct CadetTunnel *t,
1679 const struct GNUNET_CADET_ChannelOpenMessage *msg)
1680{
1681 struct CadetChannel *ch;
1682 size_t size;
1683
1684 /* Check size */
1685 size = ntohs (msg->header.size);
1686 if (size != sizeof (struct GNUNET_CADET_ChannelOpenMessage))
1687 {
1688 GNUNET_break_op (0);
1689 return;
1690 }
1691
1692 /* Check channel */
1693 ch = GCT_get_channel (t, msg->ctn);
1694 if (NULL != ch && ! GCT_is_loopback (t))
1695 {
1696 /* Probably a retransmission, safe to ignore */
1697 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
1698 }
1699 ch = GCCH_handle_create (t, msg);
1700 if (NULL != ch)
1701 GCT_add_channel (t, ch);
1702}
1703
1704
1705
1706/**
1707 * Handle channel NACK: check correctness and call channel handler for NACKs.
1708 *
1709 * @param t Tunnel on which the NACK came.
1710 * @param msg NACK message.
1711 */
1712static void
1713handle_ch_nack (struct CadetTunnel *t,
1714 const struct GNUNET_CADET_ChannelManageMessage *msg)
1715{
1716 struct CadetChannel *ch;
1717 size_t size;
1718
1719 /* Check size */
1720 size = ntohs (msg->header.size);
1721 if (size != sizeof (struct GNUNET_CADET_ChannelManageMessage))
1722 {
1723 GNUNET_break (0);
1724 return;
1725 }
1726
1727 /* Check channel */
1728 ch = GCT_get_channel (t, msg->ctn);
1729 if (NULL == ch)
1730 {
1731 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
1732 1, GNUNET_NO);
1733 LOG (GNUNET_ERROR_TYPE_DEBUG,
1734 "WARNING channel %u unknown\n",
1735 ntohl (msg->ctn.cn));
1736 return;
1737 }
1738
1739 GCCH_handle_nack (ch);
1740}
1741
1742
1743/**
1744 * Handle a CHANNEL ACK (SYNACK/ACK).
1745 *
1746 * @param t Tunnel on which the CHANNEL ACK came.
1747 * @param msg CHANNEL ACK message.
1748 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1749 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1750 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1751 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1752 */
1753static void
1754handle_ch_ack (struct CadetTunnel *t,
1755 const struct GNUNET_CADET_ChannelManageMessage *msg,
1756 int fwd)
1757{
1758 struct CadetChannel *ch;
1759 size_t size;
1760
1761 /* Check size */
1762 size = ntohs (msg->header.size);
1763 if (size != sizeof (struct GNUNET_CADET_ChannelManageMessage))
1764 {
1765 GNUNET_break (0);
1766 return;
1767 }
1768
1769 /* Check channel */
1770 ch = GCT_get_channel (t, msg->ctn);
1771 if (NULL == ch)
1772 {
1773 GNUNET_STATISTICS_update (stats,
1774 "# channel ack on unknown channel",
1775 1,
1776 GNUNET_NO);
1777 LOG (GNUNET_ERROR_TYPE_DEBUG,
1778 "WARNING channel %u unknown\n",
1779 ntohl (msg->ctn.cn));
1780 return;
1781 }
1782
1783 GCCH_handle_ack (ch, msg, fwd);
1784}
1785
1786
1787/**
1788 * Handle a channel destruction message.
1789 *
1790 * @param t Tunnel on which the message came.
1791 * @param msg Channel destroy message.
1792 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1793 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1794 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1795 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1796 */
1797static void
1798handle_ch_destroy (struct CadetTunnel *t,
1799 const struct GNUNET_CADET_ChannelManageMessage *msg,
1800 int fwd)
1801{
1802 struct CadetChannel *ch;
1803 size_t size;
1804
1805 /* Check size */
1806 size = ntohs (msg->header.size);
1807 if (size != sizeof (struct GNUNET_CADET_ChannelManageMessage))
1808 {
1809 GNUNET_break (0);
1810 return;
1811 }
1812
1813 /* Check channel */
1814 ch = GCT_get_channel (t, msg->ctn);
1815 if (NULL == ch)
1816 {
1817 /* Probably a retransmission, safe to ignore */
1818 return;
1819 }
1820
1821 GCCH_handle_destroy (ch, msg, fwd);
1822}
1823
1824
1825/**
1826 * Free Axolotl data.
1827 *
1828 * @param t Tunnel.
1829 */
1830static void
1831destroy_ax (struct CadetTunnel *t)
1832{
1833 if (NULL == t->ax)
1834 return;
1835
1836 GNUNET_free_non_null (t->ax->DHRs);
1837 GNUNET_free_non_null (t->ax->kx_0);
1838 while (NULL != t->ax->skipped_head)
1839 delete_skipped_key (t, t->ax->skipped_head);
1840 GNUNET_assert (0 == t->ax->skipped);
1841
1842 GNUNET_free (t->ax);
1843 t->ax = NULL;
1844
1845 if (NULL != t->rekey_task)
1846 {
1847 GNUNET_SCHEDULER_cancel (t->rekey_task);
1848 t->rekey_task = NULL;
1849 }
1850 if (NULL != t->ephm_h)
1851 {
1852 GCC_cancel (t->ephm_h);
1853 t->ephm_h = NULL;
1854 }
1855}
1856
1857
1858/**
1859 * Demultiplex by message type and call appropriate handler for a message
1860 * towards a channel of a local tunnel.
1861 *
1862 * @param t Tunnel this message came on.
1863 * @param msgh Message header.
1864 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
1865 * #GNUNET_YES if message is FWD on the respective channel (loopback)
1866 * #GNUNET_NO if message is BCK on the respective channel (loopback)
1867 * #GNUNET_SYSERR if message on a one-ended channel (remote)
1868 */
1869static void
1870handle_decrypted (struct CadetTunnel *t,
1871 const struct GNUNET_MessageHeader *msgh,
1872 int fwd)
1873{
1874 uint16_t type;
1875 char buf[256];
1876
1877 type = ntohs (msgh->type);
1878 LOG (GNUNET_ERROR_TYPE_DEBUG, "<-- %s on %s\n", GC_m2s (type), GCT_2s (t));
1879 SPRINTF (buf, "# received encrypted of type %hu (%s)", type, GC_m2s (type));
1880 GNUNET_STATISTICS_update (stats, buf, 1, GNUNET_NO);
1881
1882 switch (type)
1883 {
1884 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE:
1885 /* Do nothing, connection aleady got updated. */
1886 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
1887 break;
1888
1889 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA:
1890 /* Don't send hop ACK, wait for client to ACK */
1891 handle_data (t, (struct GNUNET_CADET_ChannelAppDataMessage *) msgh, fwd);
1892 break;
1893
1894 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_APP_DATA_ACK:
1895 handle_data_ack (t, (struct GNUNET_CADET_ChannelDataAckMessage *) msgh, fwd);
1896 break;
1897
1898 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN:
1899 handle_ch_create (t, (struct GNUNET_CADET_ChannelOpenMessage *) msgh);
1900 break;
1901
1902 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_NACK_DEPRECATED:
1903 handle_ch_nack (t, (struct GNUNET_CADET_ChannelManageMessage *) msgh);
1904 break;
1905
1906 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_OPEN_ACK:
1907 handle_ch_ack (t, (struct GNUNET_CADET_ChannelManageMessage *) msgh, fwd);
1908 break;
1909
1910 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1911 handle_ch_destroy (t, (struct GNUNET_CADET_ChannelManageMessage *) msgh, fwd);
1912 break;
1913
1914 default:
1915 GNUNET_break_op (0);
1916 LOG (GNUNET_ERROR_TYPE_WARNING,
1917 "end-to-end message not known (%u)\n",
1918 ntohs (msgh->type));
1919 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1920 }
1921}
1922
1923
1924/******************************************************************************/
1925/******************************** API ***********************************/
1926/******************************************************************************/
1927
1928/**
1929 * Decrypt and process an encrypted message.
1930 *
1931 * Calls the appropriate handler for a message in a channel of a local tunnel.
1932 *
1933 * @param t Tunnel this message came on.
1934 * @param msg Message header.
1935 */
1936void
1937GCT_handle_encrypted (struct CadetTunnel *t,
1938 const struct GNUNET_CADET_TunnelEncryptedMessage *msg)
1939{
1940 uint16_t size = ntohs (msg->header.size);
1941 char cbuf [size];
1942 int decrypted_size;
1943 const struct GNUNET_MessageHeader *msgh;
1944 unsigned int off;
1945
1946 GNUNET_STATISTICS_update (stats, "# received encrypted", 1, GNUNET_NO);
1947
1948 decrypted_size = t_ax_decrypt_and_validate (t, cbuf, msg, size);
1949
1950 if (-1 == decrypted_size)
1951 {
1952 GNUNET_STATISTICS_update (stats, "# unable to decrypt", 1, GNUNET_NO);
1953 if (CADET_TUNNEL_KEY_AX_AUTH_SENT <= t->estate)
1954 {
1955 GNUNET_break_op (0);
1956 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong crypto, tunnel %s\n", GCT_2s (t));
1957 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1958 }
1959 return;
1960 }
1961 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
1962
1963 /* FIXME: this is bad, as the structs returned from
1964 this loop may be unaligned, see util's MST for
1965 how to do this right. */
1966 off = 0;
1967 while (off + sizeof (struct GNUNET_MessageHeader) <= decrypted_size)
1968 {
1969 uint16_t msize;
1970
1971 msgh = (const struct GNUNET_MessageHeader *) &cbuf[off];
1972 msize = ntohs (msgh->size);
1973 if (msize < sizeof (struct GNUNET_MessageHeader))
1974 {
1975 GNUNET_break_op (0);
1976 return;
1977 }
1978 if (off + msize < decrypted_size)
1979 {
1980 GNUNET_break_op (0);
1981 return;
1982 }
1983 handle_decrypted (t, msgh, GNUNET_SYSERR);
1984 off += msize;
1985 }
1986}
1987
1988
1989/**
1990 * Handle a Key eXchange message.
1991 *
1992 * @param t Tunnel on which the message came.
1993 * @param msg KX message itself.
1994 */
1995void
1996GCT_handle_kx (struct CadetTunnel *t,
1997 const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg)
1998{
1999 struct CadetTunnelAxolotl *ax;
2000 struct GNUNET_HashCode key_material[3];
2001 struct GNUNET_CRYPTO_SymmetricSessionKey keys[5];
2002 const char salt[] = "CADET Axolotl salt";
2003 const struct GNUNET_PeerIdentity *pid;
2004 int am_I_alice;
2005
2006 CADET_TIMING_START;
2007
2008 LOG (GNUNET_ERROR_TYPE_INFO, "<== { KX} on %s\n", GCT_2s (t));
2009
2010 if (NULL == t->ax)
2011 {
2012 /* Something is wrong if ax is NULL. Whose fault it is? */
2013 return;
2014 }
2015 ax = t->ax;
2016
2017 pid = GCT_get_destination (t);
2018 if (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
2019 am_I_alice = GNUNET_YES;
2020 else if (0 < GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
2021 am_I_alice = GNUNET_NO;
2022 else
2023 {
2024 GNUNET_break_op (0);
2025 return;
2026 }
2027
2028 if (0 != (GNUNET_CADET_KX_FLAG_FORCE_REPLY & ntohl (msg->flags)))
2029 {
2030 if (NULL != t->rekey_task)
2031 {
2032 GNUNET_SCHEDULER_cancel (t->rekey_task);
2033 t->rekey_task = NULL;
2034 }
2035 GCT_send_kx (t, GNUNET_NO);
2036 }
2037
2038 if (0 == memcmp (&ax->DHRr, &msg->ratchet_key, sizeof(msg->ratchet_key)))
2039 {
2040 LOG (GNUNET_ERROR_TYPE_INFO, " known ratchet key, exit\n");
2041 return;
2042 }
2043
2044 LOG (GNUNET_ERROR_TYPE_INFO, " is Alice? %s\n", am_I_alice ? "YES" : "NO");
2045
2046 ax->DHRr = msg->ratchet_key;
2047
2048 /* ECDH A B0 */
2049 if (GNUNET_YES == am_I_alice)
2050 {
2051 GNUNET_CRYPTO_eddsa_ecdh (id_key, /* A */
2052 &msg->ephemeral_key, /* B0 */
2053 &key_material[0]);
2054 }
2055 else
2056 {
2057 GNUNET_CRYPTO_ecdh_eddsa (ax->kx_0, /* B0 */
2058 &pid->public_key, /* A */
2059 &key_material[0]);
2060 }
2061
2062 /* ECDH A0 B */
2063 if (GNUNET_YES == am_I_alice)
2064 {
2065 GNUNET_CRYPTO_ecdh_eddsa (ax->kx_0, /* A0 */
2066 &pid->public_key, /* B */
2067 &key_material[1]);
2068 }
2069 else
2070 {
2071 GNUNET_CRYPTO_eddsa_ecdh (id_key, /* A */
2072 &msg->ephemeral_key, /* B0 */
2073 &key_material[1]);
2074
2075
2076 }
2077
2078 /* ECDH A0 B0 */
2079 /* (This is the triple-DH, we could probably safely skip this,
2080 as A0/B0 are already in the key material.) */
2081 GNUNET_CRYPTO_ecc_ecdh (ax->kx_0, /* A0 or B0 */
2082 &msg->ephemeral_key, /* B0 or A0 */
2083 &key_material[2]);
2084
2085 #if DUMP_KEYS_TO_STDERR
2086 {
2087 unsigned int i;
2088 for (i = 0; i < 3; i++)
2089 LOG (GNUNET_ERROR_TYPE_INFO, "km[%u]: %s\n",
2090 i, GNUNET_h2s (&key_material[i]));
2091 }
2092 #endif
2093
2094 /* KDF */
2095 GNUNET_CRYPTO_kdf (keys, sizeof (keys),
2096 salt, sizeof (salt),
2097 &key_material, sizeof (key_material), NULL);
2098
2099 if (0 == memcmp (&ax->RK, &keys[0], sizeof(ax->RK)))
2100 {
2101 LOG (GNUNET_ERROR_TYPE_INFO, " known handshake key, exit\n");
2102 return;
2103 }
2104 ax->RK = keys[0];
2105 if (GNUNET_YES == am_I_alice)
2106 {
2107 ax->HKr = keys[1];
2108 ax->NHKs = keys[2];
2109 ax->NHKr = keys[3];
2110 ax->CKr = keys[4];
2111 ax->ratchet_flag = GNUNET_YES;
2112 }
2113 else
2114 {
2115 ax->HKs = keys[1];
2116 ax->NHKr = keys[2];
2117 ax->NHKs = keys[3];
2118 ax->CKs = keys[4];
2119 ax->ratchet_flag = GNUNET_NO;
2120 ax->ratchet_allowed = GNUNET_NO;
2121 ax->ratchet_counter = 0;
2122 ax->ratchet_expiration =
2123 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get(), ratchet_time);
2124 }
2125 ax->PNs = 0;
2126 ax->Nr = 0;
2127 ax->Ns = 0;
2128
2129 GCT_change_estate (t, CADET_TUNNEL_KEY_AX_AUTH_SENT);
2130 send_queued_data (t);
2131
2132 CADET_TIMING_END;
2133}
2134
2135/**
2136 * Initialize the tunnel subsystem.
2137 *
2138 * @param c Configuration handle.
2139 * @param key ECC private key, to derive all other keys and do crypto.
2140 */
2141void
2142GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
2143 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
2144{
2145 unsigned int expected_overhead;
2146
2147 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
2148
2149 expected_overhead = 0;
2150 expected_overhead += sizeof (struct GNUNET_CADET_TunnelEncryptedMessage);
2151 expected_overhead += sizeof (struct GNUNET_CADET_ChannelAppDataMessage);
2152 expected_overhead += sizeof (struct GNUNET_CADET_ConnectionEncryptedAckMessage);
2153 GNUNET_assert (GNUNET_CONSTANTS_CADET_P2P_OVERHEAD == expected_overhead);
2154
2155 if (GNUNET_OK !=
2156 GNUNET_CONFIGURATION_get_value_number (c,
2157 "CADET",
2158 "RATCHET_MESSAGES",
2159 &ratchet_messages))
2160 {
2161 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2162 "CADET",
2163 "RATCHET_MESSAGES",
2164 "USING DEFAULT");
2165 ratchet_messages = 64;
2166 }
2167 if (GNUNET_OK !=
2168 GNUNET_CONFIGURATION_get_value_time (c,
2169 "CADET",
2170 "RATCHET_TIME",
2171 &ratchet_time))
2172 {
2173 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
2174 "CADET", "RATCHET_TIME", "USING DEFAULT");
2175 ratchet_time = GNUNET_TIME_UNIT_HOURS;
2176 }
2177
2178
2179 id_key = key;
2180 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2181}
2182
2183
2184/**
2185 * Shut down the tunnel subsystem.
2186 */
2187void
2188GCT_shutdown (void)
2189{
2190 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down tunnels\n");
2191 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
2192 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
2193}
2194
2195
2196/**
2197 * Create a tunnel.
2198 *
2199 * @param destination Peer this tunnel is towards.
2200 */
2201struct CadetTunnel *
2202GCT_new (struct CadetPeer *destination)
2203{
2204 struct CadetTunnel *t;
2205
2206 t = GNUNET_new (struct CadetTunnel);
2207 t->next_ctn.cn = 0;
2208 t->peer = destination;
2209
2210 if (GNUNET_OK !=
2211 GNUNET_CONTAINER_multipeermap_put (tunnels, GCP_get_id (destination), t,
2212 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2213 {
2214 GNUNET_break (0);
2215 GNUNET_free (t);
2216 return NULL;
2217 }
2218 t->ax = GNUNET_new (struct CadetTunnelAxolotl);
2219 new_ephemeral (t);
2220 t->ax->kx_0 = GNUNET_CRYPTO_ecdhe_key_create ();
2221 return t;
2222}
2223
2224
2225/**
2226 * Change the tunnel's connection state.
2227 *
2228 * @param t Tunnel whose connection state to change.
2229 * @param cstate New connection state.
2230 */
2231void
2232GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate)
2233{
2234 if (NULL == t)
2235 return;
2236 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
2237 GCP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
2238 if (myid != GCP_get_short_id (t->peer) &&
2239 CADET_TUNNEL_READY != t->cstate &&
2240 CADET_TUNNEL_READY == cstate)
2241 {
2242 t->cstate = cstate;
2243 if (CADET_TUNNEL_KEY_OK == t->estate)
2244 {
2245 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
2246 send_queued_data (t);
2247 }
2248 else if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
2249 {
2250 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered KX\n");
2251 GCT_send_kx (t, GNUNET_NO);
2252 }
2253 else
2254 {
2255 LOG (GNUNET_ERROR_TYPE_DEBUG, "estate %s\n", estate2s (t->estate));
2256 }
2257 }
2258 t->cstate = cstate;
2259
2260 if (CADET_TUNNEL_READY == cstate
2261 && CONNECTIONS_PER_TUNNEL <= GCT_count_connections (t))
2262 {
2263 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
2264 GCP_stop_search (t->peer);
2265 }
2266}
2267
2268
2269/**
2270 * Change the tunnel encryption state.
2271 *
2272 * If the encryption state changes to OK, stop the rekey task.
2273 *
2274 * @param t Tunnel whose encryption state to change, or NULL.
2275 * @param state New encryption state.
2276 */
2277void
2278GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state)
2279{
2280 enum CadetTunnelEState old;
2281
2282 if (NULL == t)
2283 return;
2284
2285 old = t->estate;
2286 t->estate = state;
2287 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate was %s\n",
2288 GCP_2s (t->peer), estate2s (old));
2289 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate is now %s\n",
2290 GCP_2s (t->peer), estate2s (t->estate));
2291
2292 if (CADET_TUNNEL_KEY_OK != old && CADET_TUNNEL_KEY_OK == t->estate)
2293 {
2294 if (NULL != t->rekey_task)
2295 {
2296 GNUNET_SCHEDULER_cancel (t->rekey_task);
2297 t->rekey_task = NULL;
2298 }
2299 /* Send queued data if tunnel is not loopback */
2300 if (myid != GCP_get_short_id (t->peer))
2301 send_queued_data (t);
2302 }
2303}
2304
2305
2306/**
2307 * @brief Check if tunnel has too many connections, and remove one if necessary.
2308 *
2309 * Currently this means the newest connection, unless it is a direct one.
2310 * Implemented as a task to avoid freeing a connection that is in the middle
2311 * of being created/processed.
2312 *
2313 * @param cls Closure (Tunnel to check).
2314 */
2315static void
2316trim_connections (void *cls)
2317{
2318 struct CadetTunnel *t = cls;
2319
2320 t->trim_connections_task = NULL;
2321 if (GCT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
2322 {
2323 struct CadetTConnection *iter;
2324 struct CadetTConnection *c;
2325
2326 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
2327 {
2328 if ((iter->created.abs_value_us > c->created.abs_value_us)
2329 && GNUNET_NO == GCC_is_direct (iter->c))
2330 {
2331 c = iter;
2332 }
2333 }
2334 if (NULL != c)
2335 {
2336 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
2337 GCT_2s (t));
2338 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
2339 GCC_2s (c->c));
2340 GCC_destroy (c->c);
2341 }
2342 else
2343 {
2344 GNUNET_break (0);
2345 }
2346 }
2347}
2348
2349
2350/**
2351 * Add a connection to a tunnel.
2352 *
2353 * @param t Tunnel.
2354 * @param c Connection.
2355 */
2356void
2357GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c)
2358{
2359 struct CadetTConnection *aux;
2360
2361 GNUNET_assert (NULL != c);
2362
2363 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GCC_2s (c));
2364 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GCT_2s (t));
2365 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2366 if (aux->c == c)
2367 return;
2368
2369 aux = GNUNET_new (struct CadetTConnection);
2370 aux->c = c;
2371 aux->created = GNUNET_TIME_absolute_get ();
2372
2373 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
2374
2375 if (CADET_TUNNEL_SEARCHING == t->cstate)
2376 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2377
2378 if (NULL != t->trim_connections_task)
2379 t->trim_connections_task = GNUNET_SCHEDULER_add_now (&trim_connections, t);
2380}
2381
2382
2383/**
2384 * Remove a connection from a tunnel.
2385 *
2386 * @param t Tunnel.
2387 * @param c Connection.
2388 */
2389void
2390GCT_remove_connection (struct CadetTunnel *t,
2391 struct CadetConnection *c)
2392{
2393 struct CadetTConnection *aux;
2394 struct CadetTConnection *next;
2395 unsigned int conns;
2396
2397 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
2398 GCC_2s (c), GCT_2s (t));
2399 for (aux = t->connection_head; aux != NULL; aux = next)
2400 {
2401 next = aux->next;
2402 if (aux->c == c)
2403 {
2404 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
2405 GNUNET_free (aux);
2406 }
2407 }
2408
2409 conns = GCT_count_connections (t);
2410 if (0 == conns
2411 && NULL == t->destroy_task
2412 && CADET_TUNNEL_SHUTDOWN != t->cstate
2413 && GNUNET_NO == shutting_down)
2414 {
2415 if (0 == GCT_count_any_connections (t))
2416 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2417 else
2418 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
2419 }
2420
2421 /* Start new connections if needed */
2422 if (CONNECTIONS_PER_TUNNEL > conns
2423 && CADET_TUNNEL_SHUTDOWN != t->cstate
2424 && GNUNET_NO == shutting_down)
2425 {
2426 LOG (GNUNET_ERROR_TYPE_DEBUG, " too few connections, getting new ones\n");
2427 GCP_connect (t->peer); /* Will change cstate to WAITING when possible */
2428 return;
2429 }
2430
2431 /* If not marked as ready, no change is needed */
2432 if (CADET_TUNNEL_READY != t->cstate)
2433 return;
2434
2435 /* Check if any connection is ready to maintain cstate */
2436 for (aux = t->connection_head; aux != NULL; aux = aux->next)
2437 if (CADET_CONNECTION_READY == GCC_get_state (aux->c))
2438 return;
2439}
2440
2441
2442/**
2443 * Add a channel to a tunnel.
2444 *
2445 * @param t Tunnel.
2446 * @param ch Channel.
2447 */
2448void
2449GCT_add_channel (struct CadetTunnel *t,
2450 struct CadetChannel *ch)
2451{
2452 struct CadetTChannel *aux;
2453
2454 GNUNET_assert (NULL != ch);
2455
2456 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
2457
2458 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2459 {
2460 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
2461 if (aux->ch == ch)
2462 return;
2463 }
2464
2465 aux = GNUNET_new (struct CadetTChannel);
2466 aux->ch = ch;
2467 LOG (GNUNET_ERROR_TYPE_DEBUG,
2468 " adding %p to %p\n", aux, t->channel_head);
2469 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head,
2470 t->channel_tail,
2471 aux);
2472
2473 if (NULL != t->destroy_task)
2474 {
2475 GNUNET_SCHEDULER_cancel (t->destroy_task);
2476 t->destroy_task = NULL;
2477 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
2478 }
2479}
2480
2481
2482/**
2483 * Remove a channel from a tunnel.
2484 *
2485 * @param t Tunnel.
2486 * @param ch Channel.
2487 */
2488void
2489GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch)
2490{
2491 struct CadetTChannel *aux;
2492
2493 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
2494 for (aux = t->channel_head; aux != NULL; aux = aux->next)
2495 {
2496 if (aux->ch == ch)
2497 {
2498 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GCCH_2s (ch));
2499 GNUNET_CONTAINER_DLL_remove (t->channel_head,
2500 t->channel_tail,
2501 aux);
2502 GNUNET_free (aux);
2503 return;
2504 }
2505 }
2506}
2507
2508
2509/**
2510 * Search for a channel by global ID.
2511 *
2512 * @param t Tunnel containing the channel.
2513 * @param ctn Public channel number.
2514 *
2515 * @return channel handler, NULL if doesn't exist
2516 */
2517struct CadetChannel *
2518GCT_get_channel (struct CadetTunnel *t,
2519 struct GNUNET_CADET_ChannelTunnelNumber ctn)
2520{
2521 struct CadetTChannel *iter;
2522
2523 if (NULL == t)
2524 return NULL;
2525
2526 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2527 {
2528 if (GCCH_get_id (iter->ch).cn == ctn.cn)
2529 break;
2530 }
2531
2532 return NULL == iter ? NULL : iter->ch;
2533}
2534
2535
2536/**
2537 * @brief Destroy a tunnel and free all resources.
2538 *
2539 * Should only be called a while after the tunnel has been marked as destroyed,
2540 * in case there is a new channel added to the same peer shortly after marking
2541 * the tunnel. This way we avoid a new public key handshake.
2542 *
2543 * @param cls Closure (tunnel to destroy).
2544 */
2545static void
2546delayed_destroy (void *cls)
2547{
2548 struct CadetTunnel *t = cls;
2549 struct CadetTConnection *iter;
2550
2551 t->destroy_task = NULL;
2552 LOG (GNUNET_ERROR_TYPE_DEBUG,
2553 "delayed destroying tunnel %p\n",
2554 t);
2555 t->cstate = CADET_TUNNEL_SHUTDOWN;
2556 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2557 {
2558 GCC_send_destroy (iter->c);
2559 }
2560 GCT_destroy (t);
2561}
2562
2563
2564/**
2565 * Tunnel is empty: destroy it.
2566 *
2567 * Notifies all connections about the destruction.
2568 *
2569 * @param t Tunnel to destroy.
2570 */
2571void
2572GCT_destroy_empty (struct CadetTunnel *t)
2573{
2574 if (GNUNET_YES == shutting_down)
2575 return; /* Will be destroyed immediately anyway */
2576
2577 if (NULL != t->destroy_task)
2578 {
2579 LOG (GNUNET_ERROR_TYPE_WARNING,
2580 "Tunnel %s is already scheduled for destruction. Tunnel debug dump:\n",
2581 GCT_2s (t));
2582 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2583 GNUNET_break (0);
2584 /* should never happen, tunnel can only become empty once, and the
2585 * task identifier should be NO_TASK (cleaned when the tunnel was created
2586 * or became un-empty)
2587 */
2588 return;
2589 }
2590
2591 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: scheduling destruction\n",
2592 GCT_2s (t));
2593
2594 // FIXME make delay a config option
2595 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
2596 &delayed_destroy, t);
2597 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %p\n",
2598 t, t->destroy_task);
2599}
2600
2601
2602/**
2603 * Destroy tunnel if empty (no more channels).
2604 *
2605 * @param t Tunnel to destroy if empty.
2606 */
2607void
2608GCT_destroy_if_empty (struct CadetTunnel *t)
2609{
2610 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GCT_2s (t));
2611 if (0 < GCT_count_channels (t))
2612 return;
2613
2614 GCT_destroy_empty (t);
2615}
2616
2617
2618/**
2619 * Destroy the tunnel.
2620 *
2621 * This function does not generate any warning traffic to clients or peers.
2622 *
2623 * Tasks:
2624 * Cancel messages belonging to this tunnel queued to neighbors.
2625 * Free any allocated resources linked to the tunnel.
2626 *
2627 * @param t The tunnel to destroy.
2628 */
2629void
2630GCT_destroy (struct CadetTunnel *t)
2631{
2632 struct CadetTConnection *iter_c;
2633 struct CadetTConnection *next_c;
2634 struct CadetTChannel *iter_ch;
2635 struct CadetTChannel *next_ch;
2636 unsigned int keepalives_queued;
2637
2638 if (NULL == t)
2639 return;
2640
2641 LOG (GNUNET_ERROR_TYPE_DEBUG,
2642 "destroying tunnel %s\n",
2643 GCP_2s (t->peer));
2644 GNUNET_break (GNUNET_YES ==
2645 GNUNET_CONTAINER_multipeermap_remove (tunnels,
2646 GCP_get_id (t->peer), t));
2647
2648 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
2649 {
2650 next_c = iter_c->next;
2651 GCC_destroy (iter_c->c);
2652 }
2653 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
2654 {
2655 next_ch = iter_ch->next;
2656 GCCH_destroy (iter_ch->ch);
2657 /* Should only happen on shutdown, but it's ok. */
2658 }
2659 keepalives_queued = 0;
2660 while (NULL != t->tq_head)
2661 {
2662 /* Should have been cleaned by destuction of channel. */
2663 struct GNUNET_MessageHeader *mh;
2664 uint16_t type;
2665
2666 mh = (struct GNUNET_MessageHeader *) &t->tq_head[1];
2667 type = ntohs (mh->type);
2668 if (0 == keepalives_queued && GNUNET_MESSAGE_TYPE_CADET_CHANNEL_KEEPALIVE == type)
2669 {
2670 keepalives_queued = 1;
2671 LOG (GNUNET_ERROR_TYPE_DEBUG,
2672 "one keepalive left behind on tunnel shutdown\n");
2673 }
2674 else if (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY == type)
2675 {
2676 LOG (GNUNET_ERROR_TYPE_WARNING,
2677 "tunnel destroyed before a CHANNEL_DESTROY was sent to peer\n");
2678 }
2679 else
2680 {
2681 GNUNET_break (0);
2682 LOG (GNUNET_ERROR_TYPE_ERROR,
2683 "message left behind on tunnel shutdown: %s\n",
2684 GC_m2s (type));
2685 }
2686 unqueue_data (t->tq_head);
2687 }
2688
2689
2690 if (NULL != t->destroy_task)
2691 {
2692 LOG (GNUNET_ERROR_TYPE_DEBUG,
2693 "cancelling dest: %p\n",
2694 t->destroy_task);
2695 GNUNET_SCHEDULER_cancel (t->destroy_task);
2696 t->destroy_task = NULL;
2697 }
2698
2699 if (NULL != t->trim_connections_task)
2700 {
2701 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling trim: %p\n",
2702 t->trim_connections_task);
2703 GNUNET_SCHEDULER_cancel (t->trim_connections_task);
2704 t->trim_connections_task = NULL;
2705 }
2706
2707 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
2708 GCP_set_tunnel (t->peer, NULL);
2709
2710 if (NULL != t->rekey_task)
2711 {
2712 GNUNET_SCHEDULER_cancel (t->rekey_task);
2713 t->rekey_task = NULL;
2714 }
2715 if (NULL != t->ax)
2716 destroy_ax (t);
2717
2718 GNUNET_free (t);
2719}
2720
2721
2722/**
2723 * @brief Use the given path for the tunnel.
2724 * Update the next and prev hops (and RCs).
2725 * (Re)start the path refresh in case the tunnel is locally owned.
2726 *
2727 * @param t Tunnel to update.
2728 * @param p Path to use.
2729 *
2730 * @return Connection created.
2731 */
2732struct CadetConnection *
2733GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *path)
2734{
2735 struct CadetConnection *c;
2736 struct GNUNET_CADET_ConnectionTunnelIdentifier cid;
2737 unsigned int own_pos;
2738
2739 if (NULL == t || NULL == path)
2740 {
2741 GNUNET_break (0);
2742 return NULL;
2743 }
2744
2745 if (CADET_TUNNEL_SHUTDOWN == t->cstate)
2746 {
2747 GNUNET_break (0);
2748 return NULL;
2749 }
2750
2751 for (own_pos = 0; own_pos < path->length; own_pos++)
2752 {
2753 if (path->peers[own_pos] == myid)
2754 break;
2755 }
2756 if (own_pos >= path->length)
2757 {
2758 GNUNET_break_op (0);
2759 return NULL;
2760 }
2761
2762 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
2763 c = GCC_new (&cid, t, path, own_pos);
2764 if (NULL == c)
2765 {
2766 /* Path was flawed */
2767 return NULL;
2768 }
2769 GCT_add_connection (t, c);
2770 return c;
2771}
2772
2773
2774/**
2775 * Count all created connections of a tunnel. Not necessarily ready connections!
2776 *
2777 * @param t Tunnel on which to count.
2778 *
2779 * @return Number of connections created, either being established or ready.
2780 */
2781unsigned int
2782GCT_count_any_connections (struct CadetTunnel *t)
2783{
2784 struct CadetTConnection *iter;
2785 unsigned int count;
2786
2787 if (NULL == t)
2788 return 0;
2789
2790 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2791 count++;
2792
2793 return count;
2794}
2795
2796
2797/**
2798 * Count established (ready) connections of a tunnel.
2799 *
2800 * @param t Tunnel on which to count.
2801 *
2802 * @return Number of connections.
2803 */
2804unsigned int
2805GCT_count_connections (struct CadetTunnel *t)
2806{
2807 struct CadetTConnection *iter;
2808 unsigned int count;
2809
2810 if (NULL == t)
2811 return 0;
2812
2813 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
2814 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
2815 count++;
2816
2817 return count;
2818}
2819
2820
2821/**
2822 * Count channels of a tunnel.
2823 *
2824 * @param t Tunnel on which to count.
2825 *
2826 * @return Number of channels.
2827 */
2828unsigned int
2829GCT_count_channels (struct CadetTunnel *t)
2830{
2831 struct CadetTChannel *iter;
2832 unsigned int count;
2833
2834 for (count = 0, iter = t->channel_head;
2835 NULL != iter;
2836 iter = iter->next, count++) /* skip */;
2837
2838 return count;
2839}
2840
2841
2842/**
2843 * Get the connectivity state of a tunnel.
2844 *
2845 * @param t Tunnel.
2846 *
2847 * @return Tunnel's connectivity state.
2848 */
2849enum CadetTunnelCState
2850GCT_get_cstate (struct CadetTunnel *t)
2851{
2852 if (NULL == t)
2853 {
2854 GNUNET_assert (0);
2855 return (enum CadetTunnelCState) -1;
2856 }
2857 return t->cstate;
2858}
2859
2860
2861/**
2862 * Get the encryption state of a tunnel.
2863 *
2864 * @param t Tunnel.
2865 *
2866 * @return Tunnel's encryption state.
2867 */
2868enum CadetTunnelEState
2869GCT_get_estate (struct CadetTunnel *t)
2870{
2871 if (NULL == t)
2872 {
2873 GNUNET_break (0);
2874 return (enum CadetTunnelEState) -1;
2875 }
2876 return t->estate;
2877}
2878
2879/**
2880 * Get the maximum buffer space for a tunnel towards a local client.
2881 *
2882 * @param t Tunnel.
2883 *
2884 * @return Biggest buffer space offered by any channel in the tunnel.
2885 */
2886unsigned int
2887GCT_get_channels_buffer (struct CadetTunnel *t)
2888{
2889 struct CadetTChannel *iter;
2890 unsigned int buffer;
2891 unsigned int ch_buf;
2892
2893 if (NULL == t->channel_head)
2894 {
2895 /* Probably getting buffer for a channel create/handshake. */
2896 LOG (GNUNET_ERROR_TYPE_DEBUG, " no channels, allow max\n");
2897 return MIN_TUNNEL_BUFFER;
2898 }
2899
2900 buffer = 0;
2901 for (iter = t->channel_head; NULL != iter; iter = iter->next)
2902 {
2903 ch_buf = get_channel_buffer (iter);
2904 if (ch_buf > buffer)
2905 buffer = ch_buf;
2906 }
2907 if (MIN_TUNNEL_BUFFER > buffer)
2908 return MIN_TUNNEL_BUFFER;
2909
2910 if (MAX_TUNNEL_BUFFER < buffer)
2911 {
2912 GNUNET_break (0);
2913 return MAX_TUNNEL_BUFFER;
2914 }
2915 return buffer;
2916}
2917
2918
2919/**
2920 * Get the total buffer space for a tunnel for P2P traffic.
2921 *
2922 * @param t Tunnel.
2923 *
2924 * @return Buffer space offered by all connections in the tunnel.
2925 */
2926unsigned int
2927GCT_get_connections_buffer (struct CadetTunnel *t)
2928{
2929 struct CadetTConnection *iter;
2930 unsigned int buffer;
2931
2932 if (GNUNET_NO == is_ready (t))
2933 {
2934 if (count_queued_data (t) >= 3)
2935 return 0;
2936 else
2937 return 1;
2938 }
2939
2940 buffer = 0;
2941 for (iter = t->connection_head; NULL != iter; iter = iter->next)
2942 {
2943 if (GCC_get_state (iter->c) != CADET_CONNECTION_READY)
2944 {
2945 continue;
2946 }
2947 buffer += get_connection_buffer (iter);
2948 }
2949
2950 return buffer;
2951}
2952
2953
2954/**
2955 * Get the tunnel's destination.
2956 *
2957 * @param t Tunnel.
2958 *
2959 * @return ID of the destination peer.
2960 */
2961const struct GNUNET_PeerIdentity *
2962GCT_get_destination (struct CadetTunnel *t)
2963{
2964 return GCP_get_id (t->peer);
2965}
2966
2967
2968/**
2969 * Get the tunnel's next free global channel ID.
2970 *
2971 * @param t Tunnel.
2972 *
2973 * @return GID of a channel free to use.
2974 */
2975struct GNUNET_CADET_ChannelTunnelNumber
2976GCT_get_next_ctn (struct CadetTunnel *t)
2977{
2978 struct GNUNET_CADET_ChannelTunnelNumber ctn;
2979 struct GNUNET_CADET_ChannelTunnelNumber mask;
2980 int result;
2981
2982 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
2983 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
2984 * If peer's ID is bigger, start at 0x4... bit 30 = 1
2985 */
2986 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (t->peer));
2987 if (0 > result)
2988 mask.cn = htonl (0x40000000);
2989 else
2990 mask.cn = 0x0;
2991 t->next_ctn.cn |= mask.cn;
2992
2993 while (NULL != GCT_get_channel (t, t->next_ctn))
2994 {
2995 LOG (GNUNET_ERROR_TYPE_DEBUG,
2996 "Channel %u exists...\n",
2997 t->next_ctn.cn);
2998 t->next_ctn.cn = htonl ((ntohl (t->next_ctn.cn) + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI);
2999 t->next_ctn.cn |= mask.cn;
3000 }
3001 ctn = t->next_ctn;
3002 t->next_ctn.cn = (t->next_ctn.cn + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3003 t->next_ctn.cn |= mask.cn;
3004
3005 return ctn;
3006}
3007
3008
3009/**
3010 * Send ACK on one or more channels due to buffer in connections.
3011 *
3012 * @param t Channel which has some free buffer space.
3013 */
3014void
3015GCT_unchoke_channels (struct CadetTunnel *t)
3016{
3017 struct CadetTChannel *iter;
3018 unsigned int buffer;
3019 unsigned int channels = GCT_count_channels (t);
3020 unsigned int choked_n;
3021 struct CadetChannel *choked[channels];
3022
3023 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_unchoke_channels on %s\n", GCT_2s (t));
3024 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
3025 if (NULL != t->channel_head)
3026 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
3027
3028 if (NULL != t->tq_head)
3029 send_queued_data (t);
3030
3031 /* Get buffer space */
3032 buffer = GCT_get_connections_buffer (t);
3033 if (0 == buffer)
3034 {
3035 return;
3036 }
3037
3038 /* Count and remember choked channels */
3039 choked_n = 0;
3040 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3041 {
3042 if (GNUNET_NO == get_channel_allowed (iter))
3043 {
3044 choked[choked_n++] = iter->ch;
3045 }
3046 }
3047
3048 /* Unchoke random channels */
3049 while (0 < buffer && 0 < choked_n)
3050 {
3051 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3052 choked_n);
3053 GCCH_allow_client (choked[r], GCCH_is_origin (choked[r], GNUNET_YES));
3054 choked_n--;
3055 buffer--;
3056 choked[r] = choked[choked_n];
3057 }
3058}
3059
3060
3061/**
3062 * Send ACK on one or more connections due to buffer space to the client.
3063 *
3064 * Iterates all connections of the tunnel and sends ACKs appropriately.
3065 *
3066 * @param t Tunnel.
3067 */
3068void
3069GCT_send_connection_acks (struct CadetTunnel *t)
3070{
3071 struct CadetTConnection *iter;
3072 uint32_t allowed;
3073 uint32_t to_allow;
3074 uint32_t allow_per_connection;
3075 unsigned int cs;
3076 unsigned int buffer;
3077
3078 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
3079 GCT_2s (t));
3080
3081 if (NULL == t)
3082 {
3083 GNUNET_break (0);
3084 return;
3085 }
3086
3087 if (CADET_TUNNEL_READY != t->cstate)
3088 return;
3089
3090 buffer = GCT_get_channels_buffer (t);
3091 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
3092
3093 /* Count connections, how many messages are already allowed */
3094 cs = GCT_count_connections (t);
3095 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3096 {
3097 allowed += get_connection_allowed (iter);
3098 }
3099 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
3100
3101 /* Make sure there is no overflow */
3102 if (allowed > buffer)
3103 return;
3104
3105 /* Authorize connections to send more data */
3106 to_allow = buffer - allowed;
3107
3108 for (iter = t->connection_head;
3109 NULL != iter && to_allow > 0;
3110 iter = iter->next)
3111 {
3112 if (CADET_CONNECTION_READY != GCC_get_state (iter->c)
3113 || get_connection_allowed (iter) > 64 / 3)
3114 {
3115 continue;
3116 }
3117 GNUNET_assert(cs != 0);
3118 allow_per_connection = to_allow/cs;
3119 to_allow -= allow_per_connection;
3120 cs--;
3121 GCC_allow (iter->c, allow_per_connection,
3122 GCC_is_origin (iter->c, GNUNET_NO));
3123 }
3124
3125 if (0 != to_allow)
3126 {
3127 /* Since we don't allow if it's allowed to send 64/3, this can happen. */
3128 LOG (GNUNET_ERROR_TYPE_DEBUG, " reminding to_allow: %u\n", to_allow);
3129 }
3130}
3131
3132
3133/**
3134 * Cancel a previously sent message while it's in the queue.
3135 *
3136 * ONLY can be called before the continuation given to the send function
3137 * is called. Once the continuation is called, the message is no longer in the
3138 * queue.
3139 *
3140 * @param q Handle to the queue.
3141 */
3142void
3143GCT_cancel (struct CadetTunnelQueue *q)
3144{
3145 if (NULL != q->cq)
3146 {
3147 GNUNET_assert (NULL == q->tqd);
3148 GCC_cancel (q->cq);
3149 /* tun_message_sent() will be called and free q */
3150 }
3151 else if (NULL != q->tqd)
3152 {
3153 unqueue_data (q->tqd);
3154 q->tqd = NULL;
3155 if (NULL != q->cont)
3156 q->cont (q->cont_cls, NULL, q, 0, 0);
3157 GNUNET_free (q);
3158 }
3159 else
3160 {
3161 GNUNET_break (0);
3162 }
3163}
3164
3165
3166/**
3167 * Check if the tunnel has queued traffic.
3168 *
3169 * @param t Tunnel to check.
3170 *
3171 * @return #GNUNET_YES if there is queued traffic
3172 * #GNUNET_NO otherwise
3173 */
3174int
3175GCT_has_queued_traffic (struct CadetTunnel *t)
3176{
3177 return (NULL != t->tq_head) ? GNUNET_YES : GNUNET_NO;
3178}
3179
3180
3181/**
3182 * Sends an already built message on a tunnel, encrypting it and
3183 * choosing the best connection if not provided.
3184 *
3185 * @param message Message to send. Function modifies it.
3186 * @param t Tunnel on which this message is transmitted.
3187 * @param c Connection to use (autoselect if NULL).
3188 * @param force Force the tunnel to take the message (buffer overfill).
3189 * @param cont Continuation to call once message is really sent.
3190 * @param cont_cls Closure for @c cont.
3191 *
3192 * @return Handle to cancel message. NULL if @c cont is NULL.
3193 */
3194struct CadetTunnelQueue *
3195GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
3196 struct CadetTunnel *t,
3197 struct CadetConnection *c,
3198 int force, GCT_sent cont, void *cont_cls)
3199{
3200 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
3201}
3202
3203
3204/**
3205 * Send a KX message.
3206 *
3207 * @param t Tunnel on which to send it.
3208 * @param force_reply Force the other peer to reply with a KX message.
3209 */
3210void
3211GCT_send_kx (struct CadetTunnel *t, int force_reply)
3212{
3213 static struct CadetEncryptedMessageIdentifier zero;
3214 struct CadetConnection *c;
3215 struct GNUNET_CADET_TunnelKeyExchangeMessage msg;
3216 enum GNUNET_CADET_KX_Flags flags;
3217
3218 LOG (GNUNET_ERROR_TYPE_INFO, "==> { KX} on %s\n", GCT_2s (t));
3219 if (NULL != t->ephm_h)
3220 {
3221 LOG (GNUNET_ERROR_TYPE_INFO, " already queued, nop\n");
3222 return;
3223 }
3224 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
3225
3226 c = tunnel_get_connection (t);
3227 if (NULL == c)
3228 {
3229 if (NULL == t->destroy_task && CADET_TUNNEL_READY == t->cstate)
3230 {
3231 GNUNET_break (0);
3232 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
3233 }
3234 return;
3235 }
3236
3237 msg.header.size = htons (sizeof (msg));
3238 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_TUNNEL_KX);
3239 flags = GNUNET_CADET_KX_FLAG_NONE;
3240 if (GNUNET_YES == force_reply)
3241 flags |= GNUNET_CADET_KX_FLAG_FORCE_REPLY;
3242 msg.flags = htonl (flags);
3243 msg.cid = *GCC_get_id (c);
3244 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->kx_0, &msg.ephemeral_key);
3245 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &msg.ratchet_key);
3246
3247 t->ephm_h = GCC_send_prebuilt_message (&msg.header,
3248 UINT16_MAX,
3249 zero,
3250 c,
3251 GCC_is_origin (c, GNUNET_YES),
3252 GNUNET_YES, &ephm_sent, t);
3253 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
3254 GCT_change_estate (t, CADET_TUNNEL_KEY_AX_SENT);
3255}
3256
3257
3258/**
3259 * Is the tunnel directed towards the local peer?
3260 *
3261 * @param t Tunnel.
3262 *
3263 * @return #GNUNET_YES if it is loopback.
3264 */
3265int
3266GCT_is_loopback (const struct CadetTunnel *t)
3267{
3268 return (myid == GCP_get_short_id (t->peer));
3269}
3270
3271
3272/**
3273 * Is the tunnel this path already?
3274 *
3275 * @param t Tunnel.
3276 * @param p Path.
3277 *
3278 * @return #GNUNET_YES a connection uses this path.
3279 */
3280int
3281GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p)
3282{
3283 struct CadetTConnection *iter;
3284
3285 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3286 if (path_equivalent (GCC_get_path (iter->c), p))
3287 return GNUNET_YES;
3288
3289 return GNUNET_NO;
3290}
3291
3292
3293/**
3294 * Get a cost of a path for a tunnel considering existing connections.
3295 *
3296 * @param t Tunnel.
3297 * @param path Candidate path.
3298 *
3299 * @return Cost of the path (path length + number of overlapping nodes)
3300 */
3301unsigned int
3302GCT_get_path_cost (const struct CadetTunnel *t,
3303 const struct CadetPeerPath *path)
3304{
3305 struct CadetTConnection *iter;
3306 const struct CadetPeerPath *aux;
3307 unsigned int overlap;
3308 unsigned int i;
3309 unsigned int j;
3310
3311 if (NULL == path)
3312 return 0;
3313
3314 overlap = 0;
3315 GNUNET_assert (NULL != t);
3316
3317 for (i = 0; i < path->length; i++)
3318 {
3319 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3320 {
3321 aux = GCC_get_path (iter->c);
3322 if (NULL == aux)
3323 continue;
3324
3325 for (j = 0; j < aux->length; j++)
3326 {
3327 if (path->peers[i] == aux->peers[j])
3328 {
3329 overlap++;
3330 break;
3331 }
3332 }
3333 }
3334 }
3335 return path->length + overlap;
3336}
3337
3338
3339/**
3340 * Get the static string for the peer this tunnel is directed.
3341 *
3342 * @param t Tunnel.
3343 *
3344 * @return Static string the destination peer's ID.
3345 */
3346const char *
3347GCT_2s (const struct CadetTunnel *t)
3348{
3349 if (NULL == t)
3350 return "(NULL)";
3351
3352 return GCP_2s (t->peer);
3353}
3354
3355
3356/******************************************************************************/
3357/***************************** INFO/DEBUG *******************************/
3358/******************************************************************************/
3359
3360static void
3361ax_debug (const struct CadetTunnelAxolotl *ax, enum GNUNET_ErrorType level)
3362{
3363 struct GNUNET_CRYPTO_EcdhePublicKey pub;
3364 struct CadetTunnelSkippedKey *iter;
3365
3366 LOG2 (level, "TTT RK \t %s\n",
3367 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->RK));
3368
3369 LOG2 (level, "TTT HKs \t %s\n",
3370 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKs));
3371 LOG2 (level, "TTT HKr \t %s\n",
3372 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->HKr));
3373 LOG2 (level, "TTT NHKs\t %s\n",
3374 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->NHKs));
3375 LOG2 (level, "TTT NHKr\t %s\n",
3376 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->NHKr));
3377
3378 LOG2 (level, "TTT CKs \t %s\n",
3379 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKs));
3380 LOG2 (level, "TTT CKr \t %s\n",
3381 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->CKr));
3382
3383 GNUNET_CRYPTO_ecdhe_key_get_public (ax->DHRs, &pub);
3384 LOG2 (level, "TTT DHRs\t %s\n",
3385 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &pub));
3386 LOG2 (level, "TTT DHRr\t %s\n",
3387 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &ax->DHRr));
3388
3389 LOG2 (level, "TTT Nr\t %u\tNs\t%u\n", ax->Nr, ax->Ns);
3390 LOG2 (level, "TTT PNs\t %u\tSkipped\t%u\n", ax->PNs, ax->skipped);
3391 LOG2 (level, "TTT Ratchet\t%u\n", ax->ratchet_flag);
3392
3393 for (iter = ax->skipped_head; NULL != iter; iter = iter->next)
3394 {
3395 LOG2 (level, "TTT HK\t %s\n",
3396 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &iter->HK));
3397 LOG2 (level, "TTT MK\t %s\n",
3398 GNUNET_i2s ((struct GNUNET_PeerIdentity *) &iter->MK));
3399 }
3400}
3401
3402/**
3403 * Log all possible info about the tunnel state.
3404 *
3405 * @param t Tunnel to debug.
3406 * @param level Debug level to use.
3407 */
3408void
3409GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
3410{
3411 struct CadetTChannel *iter_ch;
3412 struct CadetTConnection *iter_c;
3413 int do_log;
3414
3415 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
3416 "cadet-tun",
3417 __FILE__, __FUNCTION__, __LINE__);
3418 if (0 == do_log)
3419 return;
3420
3421 LOG2 (level, "TTT DEBUG TUNNEL TOWARDS %s\n", GCT_2s (t));
3422 LOG2 (level, "TTT cstate %s, estate %s\n",
3423 cstate2s (t->cstate), estate2s (t->estate));
3424#if DUMP_KEYS_TO_STDERR
3425 ax_debug (t->ax, level);
3426#endif
3427 LOG2 (level, "TTT tq_head %p, tq_tail %p\n", t->tq_head, t->tq_tail);
3428 LOG2 (level, "TTT destroy %p\n", t->destroy_task);
3429 LOG2 (level, "TTT channels:\n");
3430 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = iter_ch->next)
3431 {
3432 GCCH_debug (iter_ch->ch, level);
3433 }
3434
3435 LOG2 (level, "TTT connections:\n");
3436 for (iter_c = t->connection_head; NULL != iter_c; iter_c = iter_c->next)
3437 {
3438 GCC_debug (iter_c->c, level);
3439 }
3440
3441 LOG2 (level, "TTT DEBUG TUNNEL END\n");
3442}
3443
3444
3445/**
3446 * Iterate all tunnels.
3447 *
3448 * @param iter Iterator.
3449 * @param cls Closure for @c iter.
3450 */
3451void
3452GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
3453{
3454 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
3455}
3456
3457
3458/**
3459 * Count all tunnels.
3460 *
3461 * @return Number of tunnels to remote peers kept by this peer.
3462 */
3463unsigned int
3464GCT_count_all (void)
3465{
3466 return GNUNET_CONTAINER_multipeermap_size (tunnels);
3467}
3468
3469
3470/**
3471 * Iterate all connections of a tunnel.
3472 *
3473 * @param t Tunnel whose connections to iterate.
3474 * @param iter Iterator.
3475 * @param cls Closure for @c iter.
3476 */
3477void
3478GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls)
3479{
3480 struct CadetTConnection *ct;
3481
3482 for (ct = t->connection_head; NULL != ct; ct = ct->next)
3483 iter (cls, ct->c);
3484}
3485
3486
3487/**
3488 * Iterate all channels of a tunnel.
3489 *
3490 * @param t Tunnel whose channels to iterate.
3491 * @param iter Iterator.
3492 * @param cls Closure for @c iter.
3493 */
3494void
3495GCT_iterate_channels (struct CadetTunnel *t, GCT_chan_iter iter, void *cls)
3496{
3497 struct CadetTChannel *cht;
3498
3499 for (cht = t->channel_head; NULL != cht; cht = cht->next)
3500 iter (cls, cht->ch);
3501}
diff --git a/src/cadet/gnunet-service-cadet_tunnel.h b/src/cadet/gnunet-service-cadet_tunnel.h
deleted file mode 100644
index 1b56a0632..000000000
--- a/src/cadet/gnunet-service-cadet_tunnel.h
+++ /dev/null
@@ -1,616 +0,0 @@
1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013 GNUnet e.V.
4
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
19*/
20
21/**
22 * @file cadet/gnunet-service-cadet_tunnel.h
23 * @brief cadet service; dealing with tunnels and crypto
24 * @author Bartlomiej Polot
25 *
26 * All functions in this file should use the prefix GMT (Gnunet Cadet Tunnel)
27 */
28
29#ifndef GNUNET_SERVICE_CADET_TUNNEL_H
30#define GNUNET_SERVICE_CADET_TUNNEL_H
31
32#ifdef __cplusplus
33extern "C"
34{
35#if 0 /* keep Emacsens' auto-indent happy */
36}
37#endif
38#endif
39
40#include "platform.h"
41#include "gnunet_util_lib.h"
42
43#define CONNECTIONS_PER_TUNNEL 3
44
45/**
46 * All the connectivity states a tunnel can be in.
47 */
48enum CadetTunnelCState
49{
50 /**
51 * Uninitialized status, should never appear in operation.
52 */
53 CADET_TUNNEL_NEW,
54
55 /**
56 * No path to the peer known yet.
57 */
58 CADET_TUNNEL_SEARCHING,
59
60 /**
61 * Request sent, not yet answered.
62 */
63 CADET_TUNNEL_WAITING,
64
65 /**
66 * Peer connected and ready to accept data.
67 */
68 CADET_TUNNEL_READY,
69
70 /**
71 * Tunnel being shut down, don't try to keep it alive.
72 */
73 CADET_TUNNEL_SHUTDOWN
74};
75
76
77/**
78 * All the encryption states a tunnel can be in.
79 */
80enum CadetTunnelEState
81{
82 /**
83 * Uninitialized status, should never appear in operation.
84 */
85 CADET_TUNNEL_KEY_UNINITIALIZED,
86
87 /**
88 * Ephemeral key sent, waiting for peer's key.
89 */
90 CADET_TUNNEL_KEY_AX_SENT,
91
92 /**
93 * In OTR: New ephemeral key and ping sent, waiting for pong.
94 *
95 * This means that we DO have the peer's ephemeral key, otherwise the
96 * state would be KEY_SENT. We DO NOT have a valid session key (either no
97 * previous key or previous key expired).
98 *
99 *
100 * In Axolotl: Key sent and received but no deciphered traffic yet.
101 *
102 * This means that we can send traffic (otherwise we would never complete
103 * the handshake), but we don't have complete confirmation. Since the first
104 * traffic MUST be a complete channel creation 3-way handshake, no payload
105 * will be sent before confirmation.
106 */
107 CADET_TUNNEL_KEY_AX_AUTH_SENT,
108
109 /**
110 * Handshake completed: session key available.
111 */
112 CADET_TUNNEL_KEY_OK,
113
114 /**
115 * New ephemeral key and ping sent, waiting for pong. Unlike KEY_PING,
116 * we still have a valid session key and therefore we *can* still send
117 * traffic on the tunnel.
118 */
119 CADET_TUNNEL_KEY_REKEY
120};
121
122/**
123 * Struct containing all information regarding a given peer
124 */
125struct CadetTunnel;
126
127
128#include "gnunet-service-cadet_channel.h"
129#include "gnunet-service-cadet_connection.h"
130#include "gnunet-service-cadet_peer.h"
131
132/**
133 * Handle for messages queued but not yet sent.
134 */
135struct CadetTunnelQueue;
136
137/**
138 * Callback called when a queued message is sent.
139 *
140 * @param cls Closure.
141 * @param t Tunnel this message was on.
142 * @param type Type of message sent.
143 * @param size Size of the message.
144 */
145typedef void
146(*GCT_sent) (void *cls,
147 struct CadetTunnel *t,
148 struct CadetTunnelQueue *q,
149 uint16_t type, size_t size);
150
151typedef void
152(*GCT_conn_iter) (void *cls, struct CadetConnection *c);
153
154
155typedef void
156(*GCT_chan_iter) (void *cls, struct CadetChannel *ch);
157
158
159/******************************************************************************/
160/******************************** API ***********************************/
161/******************************************************************************/
162
163/**
164 * Initialize tunnel subsystem.
165 *
166 * @param c Configuration handle.
167 * @param key ECC private key, to derive all other keys and do crypto.
168 */
169void
170GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
171 const struct GNUNET_CRYPTO_EddsaPrivateKey *key);
172
173
174/**
175 * Shut down the tunnel subsystem.
176 */
177void
178GCT_shutdown (void);
179
180
181/**
182 * Create a tunnel.
183 *
184 * @param destination Peer this tunnel is towards.
185 */
186struct CadetTunnel *
187GCT_new (struct CadetPeer *destination);
188
189
190/**
191 * Tunnel is empty: destroy it.
192 *
193 * Notifies all connections about the destruction.
194 *
195 * @param t Tunnel to destroy.
196 */
197void
198GCT_destroy_empty (struct CadetTunnel *t);
199
200
201/**
202 * Destroy tunnel if empty (no more channels).
203 *
204 * @param t Tunnel to destroy if empty.
205 */
206void
207GCT_destroy_if_empty (struct CadetTunnel *t);
208
209
210/**
211 * Destroy the tunnel.
212 *
213 * This function does not generate any warning traffic to clients or peers.
214 *
215 * Tasks:
216 * Cancel messages belonging to this tunnel queued to neighbors.
217 * Free any allocated resources linked to the tunnel.
218 *
219 * @param t The tunnel to destroy.
220 */
221void
222GCT_destroy (struct CadetTunnel *t);
223
224
225/**
226 * Change the tunnel's connection state.
227 *
228 * @param t Tunnel whose connection state to change.
229 * @param cstate New connection state.
230 */
231void
232GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate);
233
234
235/**
236 * Change the tunnel encryption state.
237 *
238 * @param t Tunnel whose encryption state to change.
239 * @param state New encryption state.
240 */
241void
242GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state);
243
244
245/**
246 * Add a connection to a tunnel.
247 *
248 * @param t Tunnel.
249 * @param c Connection.
250 */
251void
252GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c);
253
254
255/**
256 * Remove a connection from a tunnel.
257 *
258 * @param t Tunnel.
259 * @param c Connection.
260 */
261void
262GCT_remove_connection (struct CadetTunnel *t, struct CadetConnection *c);
263
264
265/**
266 * Add a channel to a tunnel.
267 *
268 * @param t Tunnel.
269 * @param ch Channel.
270 */
271void
272GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch);
273
274
275/**
276 * Remove a channel from a tunnel.
277 *
278 * @param t Tunnel.
279 * @param ch Channel.
280 */
281void
282GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch);
283
284
285/**
286 * Search for a channel by global ID.
287 *
288 * @param t Tunnel containing the channel.
289 * @param ctn Public channel number.
290 *
291 * @return channel handler, NULL if doesn't exist
292 */
293struct CadetChannel *
294GCT_get_channel (struct CadetTunnel *t, struct GNUNET_CADET_ChannelTunnelNumber ctn);
295
296
297/**
298 * Decrypt and process an encrypted message.
299 *
300 * Calls the appropriate handler for a message in a channel of a local tunnel.
301 *
302 * @param t Tunnel this message came on.
303 * @param msg Message header.
304 */
305void
306GCT_handle_encrypted (struct CadetTunnel *t,
307 const struct GNUNET_CADET_TunnelEncryptedMessage *msg);
308
309
310/**
311 * Handle a Key eXchange message.
312 *
313 * @param t Tunnel on which the message came.
314 * @param msg KX message itself.
315 */
316void
317GCT_handle_kx (struct CadetTunnel *t,
318 const struct GNUNET_CADET_TunnelKeyExchangeMessage *msg);
319
320
321/**
322 * @brief Use the given path for the tunnel.
323 * Update the next and prev hops (and RCs).
324 * (Re)start the path refresh in case the tunnel is locally owned.
325 *
326 * @param t Tunnel to update.
327 * @param p Path to use.
328 *
329 * @return Connection created.
330 */
331struct CadetConnection *
332GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *p);
333
334
335/**
336 * Count all created connections of a tunnel. Not necessarily ready connections!
337 *
338 * @param t Tunnel on which to count.
339 *
340 * @return Number of connections created, either being established or ready.
341 */
342unsigned int
343GCT_count_any_connections (struct CadetTunnel *t);
344
345
346/**
347 * Count established (ready) connections of a tunnel.
348 *
349 * @param t Tunnel on which to count.
350 *
351 * @return Number of connections.
352 */
353unsigned int
354GCT_count_connections (struct CadetTunnel *t);
355
356
357/**
358 * Count channels of a tunnel.
359 *
360 * @param t Tunnel on which to count.
361 *
362 * @return Number of channels.
363 */
364unsigned int
365GCT_count_channels (struct CadetTunnel *t);
366
367
368/**
369 * Get the connectivity state of a tunnel.
370 *
371 * @param t Tunnel.
372 *
373 * @return Tunnel's connectivity state.
374 */
375enum CadetTunnelCState
376GCT_get_cstate (struct CadetTunnel *t);
377
378
379/**
380 * Get the encryption state of a tunnel.
381 *
382 * @param t Tunnel.
383 *
384 * @return Tunnel's encryption state.
385 */
386enum CadetTunnelEState
387GCT_get_estate (struct CadetTunnel *t);
388
389
390/**
391 * Get the maximum buffer space for a tunnel towards a local client.
392 *
393 * @param t Tunnel.
394 *
395 * @return Biggest buffer space offered by any channel in the tunnel.
396 */
397unsigned int
398GCT_get_channels_buffer (struct CadetTunnel *t);
399
400
401/**
402 * Get the total buffer space for a tunnel for P2P traffic.
403 *
404 * @param t Tunnel.
405 *
406 * @return Buffer space offered by all connections in the tunnel.
407 */
408unsigned int
409GCT_get_connections_buffer (struct CadetTunnel *t);
410
411
412/**
413 * Get the tunnel's destination.
414 *
415 * @param t Tunnel.
416 *
417 * @return ID of the destination peer.
418 */
419const struct GNUNET_PeerIdentity *
420GCT_get_destination (struct CadetTunnel *t);
421
422
423/**
424 * Get the tunnel's next free Channel ID.
425 *
426 * @param t Tunnel.
427 *
428 * @return ID of a channel free to use.
429 */
430struct GNUNET_CADET_ChannelTunnelNumber
431GCT_get_next_ctn (struct CadetTunnel *t);
432
433
434/**
435 * Send ACK on one or more channels due to buffer in connections.
436 *
437 * @param t Channel which has some free buffer space.
438 */
439void
440GCT_unchoke_channels (struct CadetTunnel *t);
441
442
443/**
444 * Send ACK on one or more connections due to buffer space to the client.
445 *
446 * Iterates all connections of the tunnel and sends ACKs appropriately.
447 *
448 * @param t Tunnel which has some free buffer space.
449 */
450void
451GCT_send_connection_acks (struct CadetTunnel *t);
452
453
454/**
455 * Cancel a previously sent message while it's in the queue.
456 *
457 * ONLY can be called before the continuation given to the send function
458 * is called. Once the continuation is called, the message is no longer in the
459 * queue.
460 *
461 * @param q Handle to the queue.
462 */
463void
464GCT_cancel (struct CadetTunnelQueue *q);
465
466
467/**
468 * Check if the tunnel has queued traffic.
469 *
470 * @param t Tunnel to check.
471 *
472 * @return #GNUNET_YES if there is queued traffic
473 * #GNUNET_NO otherwise
474 */
475int
476GCT_has_queued_traffic (struct CadetTunnel *t);
477
478/**
479 * Sends an already built message on a tunnel, encrypting it and
480 * choosing the best connection.
481 *
482 * @param message Message to send. Function modifies it.
483 * @param t Tunnel on which this message is transmitted.
484 * @param c Connection to use (autoselect if NULL).
485 * @param force Force the tunnel to take the message (buffer overfill).
486 * @param cont Continuation to call once message is really sent.
487 * @param cont_cls Closure for @c cont.
488 *
489 * @return Handle to cancel message. NULL if @c cont is NULL.
490 */
491struct CadetTunnelQueue *
492GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
493 struct CadetTunnel *t, struct CadetConnection *c,
494 int force, GCT_sent cont, void *cont_cls);
495
496
497/**
498 * Send a KX message.
499 *
500 * @param t Tunnel on which to send it.
501 * @param force_reply Force the other peer to reply with a KX message.
502 */
503void
504GCT_send_kx (struct CadetTunnel *t, int force_reply);
505
506
507/**
508 * Is the tunnel directed towards the local peer?
509 *
510 * @param t Tunnel.
511 *
512 * @return #GNUNET_YES if it is loopback.
513 */
514int
515GCT_is_loopback (const struct CadetTunnel *t);
516
517
518/**
519 * Is the tunnel using this path already?
520 *
521 * @param t Tunnel.
522 * @param p Path.
523 *
524 * @return #GNUNET_YES a connection uses this path.
525 */
526int
527GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p);
528
529
530/**
531 * Get a cost of a path for a tunnel considering existing connections.
532 *
533 * @param t Tunnel.
534 * @param path Candidate path.
535 *
536 * @return Cost of the path (path length + number of overlapping nodes)
537 */
538unsigned int
539GCT_get_path_cost (const struct CadetTunnel *t,
540 const struct CadetPeerPath *path);
541
542
543/**
544 * Get the static string for the peer this tunnel is directed.
545 *
546 * @param t Tunnel.
547 *
548 * @return Static string the destination peer's ID.
549 */
550const char *
551GCT_2s (const struct CadetTunnel *t);
552
553
554/**
555 * Log all possible info about the tunnel state.
556 *
557 * @param t Tunnel to debug.
558 * @param level Debug level to use.
559 */
560void
561GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level);
562
563
564/**
565 * Iterate all tunnels.
566 *
567 * @param iter Iterator.
568 * @param cls Closure for @c iter.
569 */
570void
571GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls);
572
573
574/**
575 * Count all tunnels.
576 *
577 * @return Number of tunnels to remote peers kept by this peer.
578 */
579unsigned int
580GCT_count_all (void);
581
582
583/**
584 * Iterate all connections of a tunnel.
585 *
586 * @param t Tunnel whose connections to iterate.
587 * @param iter Iterator.
588 * @param cls Closure for @c iter.
589 */
590void
591GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls);
592
593
594/**
595 * Iterate all channels of a tunnel.
596 *
597 * @param t Tunnel whose channels to iterate.
598 * @param iter Iterator.
599 * @param cls Closure for @c iter.
600 */
601void
602GCT_iterate_channels (struct CadetTunnel *t,
603 GCT_chan_iter iter,
604 void *cls);
605
606
607#if 0 /* keep Emacsens' auto-indent happy */
608{
609#endif
610#ifdef __cplusplus
611}
612#endif
613
614/* ifndef GNUNET_CADET_SERVICE_TUNNEL_H */
615#endif
616/* end of gnunet-cadet-service_tunnel.h */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-18 19:05:37 +0000