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-rw-r--r--src/transport/gnunet-service-transport.c2778
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diff --git a/src/transport/gnunet-service-transport.c b/src/transport/gnunet-service-transport.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2010-2016 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your 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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20/**
21 * @file transport/gnunet-service-transport.c
22 * @brief main for gnunet-service-transport
23 * @author Christian Grothoff
24 */
25#include "platform.h"
26#include "gnunet_util_lib.h"
27#include "gnunet_hello_lib.h"
28#include "gnunet_statistics_service.h"
29#include "gnunet_transport_service.h"
30#include "gnunet_peerinfo_service.h"
31#include "gnunet_ats_service.h"
32#include "gnunet-service-transport.h"
33#include "gnunet-service-transport_ats.h"
34#include "gnunet-service-transport_hello.h"
35#include "gnunet-service-transport_neighbours.h"
36#include "gnunet-service-transport_plugins.h"
37#include "gnunet-service-transport_validation.h"
38#include "gnunet-service-transport_manipulation.h"
39#include "transport.h"
40
41/**
42 * Size of the blacklist hash map.
43 */
44#define TRANSPORT_BLACKLIST_HT_SIZE 64
45
46/**
47 * How many messages can we have pending for a given client process
48 * before we start to drop incoming messages? We typically should
49 * have only one client and so this would be the primary buffer for
50 * messages, so the number should be chosen rather generously.
51 *
52 * The expectation here is that most of the time the queue is large
53 * enough so that a drop is virtually never required. Note that
54 * this value must be about as large as 'TOTAL_MSGS' in the
55 * 'test_transport_api_reliability.c', otherwise that testcase may
56 * fail.
57 */
58#define MAX_PENDING (128 * 1024)
59
60
61/**
62 * Information we need for an asynchronous session kill.
63 */
64struct GNUNET_ATS_SessionKiller
65{
66 /**
67 * Kept in a DLL.
68 */
69 struct GNUNET_ATS_SessionKiller *next;
70
71 /**
72 * Kept in a DLL.
73 */
74 struct GNUNET_ATS_SessionKiller *prev;
75
76 /**
77 * Session to kill.
78 */
79 struct GNUNET_ATS_Session *session;
80
81 /**
82 * Plugin for the session.
83 */
84 struct GNUNET_TRANSPORT_PluginFunctions *plugin;
85
86 /**
87 * The kill task.
88 */
89 struct GNUNET_SCHEDULER_Task *task;
90};
91
92
93/**
94 * What type of client is the `struct TransportClient` about?
95 */
96enum ClientType
97{
98 /**
99 * We do not know yet (client is fresh).
100 */
101 CT_NONE = 0,
102
103 /**
104 * Is the CORE service, we need to forward traffic to it.
105 */
106 CT_CORE = 1,
107
108 /**
109 * It is a monitor, forward monitor data.
110 */
111 CT_MONITOR = 2,
112
113 /**
114 * It is a blacklist, query about allowed connections.
115 */
116 CT_BLACKLIST = 3,
117
118 /**
119 * CORE client without any handlers.
120 */
121 CT_CORE_NO_HANDLERS = 4
122};
123
124
125/**
126 * Context we use when performing a blacklist check.
127 */
128struct GST_BlacklistCheck;
129
130/**
131 * Client connected to the transport service.
132 */
133struct TransportClient
134{
135 /**
136 * This is a doubly-linked list.
137 */
138 struct TransportClient *next;
139
140 /**
141 * This is a doubly-linked list.
142 */
143 struct TransportClient *prev;
144
145 /**
146 * Handle to the client.
147 */
148 struct GNUNET_SERVICE_Client *client;
149
150 /**
151 * Message queue to the client.
152 */
153 struct GNUNET_MQ_Handle *mq;
154
155 /**
156 * What type of client is this?
157 */
158 enum ClientType type;
159
160 union
161 {
162 /**
163 * Peer identity to monitor the addresses of.
164 * Zero to monitor all neighbours. Valid if
165 * @e type is CT_MONITOR.
166 */
167 struct GNUNET_PeerIdentity monitor_peer;
168
169 /**
170 * Additional details if @e type is CT_BLACKLIST.
171 */
172 struct
173 {
174 /**
175 * Blacklist check that we're currently performing (or NULL
176 * if we're performing one that has been cancelled).
177 */
178 struct GST_BlacklistCheck *bc;
179
180 /**
181 * Set to #GNUNET_YES if we're currently waiting for a reply.
182 */
183 int waiting_for_reply;
184
185 /**
186 * #GNUNET_YES if we have to call receive_done for this client
187 */
188 int call_receive_done;
189 } blacklist;
190 } details;
191};
192
193
194/**
195 * Context we use when performing a blacklist check.
196 */
197struct GST_BlacklistCheck
198{
199 /**
200 * This is a linked list.
201 */
202 struct GST_BlacklistCheck *next;
203
204 /**
205 * This is a linked list.
206 */
207 struct GST_BlacklistCheck *prev;
208
209 /**
210 * Peer being checked.
211 */
212 struct GNUNET_PeerIdentity peer;
213
214 /**
215 * Continuation to call with the result.
216 */
217 GST_BlacklistTestContinuation cont;
218
219 /**
220 * Closure for @e cont.
221 */
222 void *cont_cls;
223
224 /**
225 * Address for #GST_blacklist_abort_matching(), can be NULL.
226 */
227 struct GNUNET_HELLO_Address *address;
228
229 /**
230 * Session for #GST_blacklist_abort_matching(), can be NULL.
231 */
232 struct GNUNET_ATS_Session *session;
233
234 /**
235 * Our current position in the blacklisters list.
236 */
237 struct TransportClient *bl_pos;
238
239 /**
240 * Current task performing the check.
241 */
242 struct GNUNET_SCHEDULER_Task *task;
243};
244
245
246/**
247 * Context for address to string operations
248 */
249struct AddressToStringContext
250{
251 /**
252 * This is a doubly-linked list.
253 */
254 struct AddressToStringContext *next;
255
256 /**
257 * This is a doubly-linked list.
258 */
259 struct AddressToStringContext *prev;
260
261 /**
262 * Client that made the request.
263 */
264 struct TransportClient *tc;
265};
266
267
268/**
269 * Closure for #handle_send_transmit_continuation()
270 */
271struct SendTransmitContinuationContext
272{
273 /**
274 * Client that made the request.
275 */
276 struct TransportClient *tc;
277
278 /**
279 * Peer that was the target.
280 */
281 struct GNUNET_PeerIdentity target;
282
283 /**
284 * At what time did we receive the message?
285 */
286 struct GNUNET_TIME_Absolute send_time;
287
288 /**
289 * Unique ID, for logging.
290 */
291 unsigned long long uuid;
292
293 /**
294 * Set to #GNUNET_YES if the connection for @e target goes
295 * down and we thus must no longer send the
296 * #GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK message.
297 */
298 int down;
299};
300
301
302/**
303 * Head of linked list of all clients to this service.
304 */
305static struct TransportClient *clients_head;
306
307/**
308 * Tail of linked list of all clients to this service.
309 */
310static struct TransportClient *clients_tail;
311
312/**
313 * Map of peer identities to active send transmit continuation
314 * contexts. Used to flag contexts as 'dead' when a connection goes
315 * down. Values are of type `struct SendTransmitContinuationContext
316 * *`.
317 */
318static struct GNUNET_CONTAINER_MultiPeerMap *active_stccs;
319
320/**
321 * Head of linked list of all pending address iterations
322 */
323static struct AddressToStringContext *a2s_head;
324
325/**
326 * Tail of linked list of all pending address iterations
327 */
328static struct AddressToStringContext *a2s_tail;
329
330/**
331 * Head of DLL of active blacklisting queries.
332 */
333static struct GST_BlacklistCheck *bc_head;
334
335/**
336 * Tail of DLL of active blacklisting queries.
337 */
338static struct GST_BlacklistCheck *bc_tail;
339
340/**
341 * Hashmap of blacklisted peers. Values are of type 'char *' (transport names),
342 * can be NULL if we have no static blacklist.
343 */
344static struct GNUNET_CONTAINER_MultiPeerMap *blacklist;
345
346/**
347 * Notification context, to send updates on changes to active plugin
348 * connections.
349 */
350static struct GNUNET_NotificationContext *plugin_nc;
351
352/**
353 * Plugin monitoring client we are currently syncing, NULL if all
354 * monitoring clients are in sync.
355 */
356static struct TransportClient *sync_client;
357
358/**
359 * Peer identity that is all zeros, used as a way to indicate
360 * "all peers". Used for comparisons.
361 */
362static struct GNUNET_PeerIdentity all_zeros;
363
364/**
365 * Statistics handle.
366 */
367struct GNUNET_STATISTICS_Handle *GST_stats;
368
369/**
370 * Configuration handle.
371 */
372const struct GNUNET_CONFIGURATION_Handle *GST_cfg;
373
374/**
375 * Configuration handle.
376 */
377struct GNUNET_PeerIdentity GST_my_identity;
378
379/**
380 * Handle to peerinfo service.
381 */
382struct GNUNET_PEERINFO_Handle *GST_peerinfo;
383
384/**
385 * Our private key.
386 */
387struct GNUNET_CRYPTO_EddsaPrivateKey GST_my_private_key;
388
389/**
390 * ATS scheduling handle.
391 */
392struct GNUNET_ATS_SchedulingHandle *GST_ats;
393
394/**
395 * ATS connectivity handle.
396 */
397struct GNUNET_ATS_ConnectivityHandle *GST_ats_connect;
398
399/**
400 * Hello address expiration
401 */
402struct GNUNET_TIME_Relative hello_expiration;
403
404/**
405 * Head of DLL of asynchronous tasks to kill sessions.
406 */
407static struct GNUNET_ATS_SessionKiller *sk_head;
408
409/**
410 * Tail of DLL of asynchronous tasks to kill sessions.
411 */
412static struct GNUNET_ATS_SessionKiller *sk_tail;
413
414/**
415 * Interface scanner determines our LAN address range(s).
416 */
417struct GNUNET_NT_InterfaceScanner *GST_is;
418
419/**
420 * Queue the given message for transmission to the given client
421 *
422 * @param tc target of the message
423 * @param msg message to transmit
424 * @param may_drop #GNUNET_YES if the message can be dropped
425 */
426static void
427unicast (struct TransportClient *tc,
428 const struct GNUNET_MessageHeader *msg,
429 int may_drop)
430{
431 struct GNUNET_MQ_Envelope *env;
432
433 if ((GNUNET_MQ_get_length (tc->mq) >= MAX_PENDING) &&
434 (GNUNET_YES == may_drop))
435 {
436 GNUNET_log (
437 GNUNET_ERROR_TYPE_DEBUG,
438 "Dropping message of type %u and size %u, have %u/%u messages pending\n",
439 ntohs (msg->type),
440 ntohs (msg->size),
441 GNUNET_MQ_get_length (tc->mq),
442 MAX_PENDING);
443 GNUNET_STATISTICS_update (GST_stats,
444 gettext_noop (
445 "# messages dropped due to slow client"),
446 1,
447 GNUNET_NO);
448 return;
449 }
450 env = GNUNET_MQ_msg_copy (msg);
451 GNUNET_MQ_send (tc->mq, env);
452}
453
454
455/**
456 * Called whenever a client connects. Allocates our
457 * data structures associated with that client.
458 *
459 * @param cls closure, NULL
460 * @param client identification of the client
461 * @param mq message queue for the client
462 * @return our `struct TransportClient`
463 */
464static void *
465client_connect_cb (void *cls,
466 struct GNUNET_SERVICE_Client *client,
467 struct GNUNET_MQ_Handle *mq)
468{
469 struct TransportClient *tc;
470
471 tc = GNUNET_new (struct TransportClient);
472 tc->client = client;
473 tc->mq = mq;
474 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, tc);
475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p connected\n", tc);
476 return tc;
477}
478
479
480/**
481 * Perform next action in the blacklist check.
482 *
483 * @param cls the `struct GST_BlacklistCheck *`
484 */
485static void
486do_blacklist_check (void *cls);
487
488
489/**
490 * Mark the peer as down so we don't call the continuation
491 * context in the future.
492 *
493 * @param cls a `struct TransportClient`
494 * @param peer a peer we are sending to
495 * @param value a `struct SendTransmitContinuationContext` to mark
496 * @return #GNUNET_OK (continue to iterate)
497 */
498static int
499mark_match_down (void *cls, const struct GNUNET_PeerIdentity *peer, void *value)
500{
501 struct TransportClient *tc = cls;
502 struct SendTransmitContinuationContext *stcc = value;
503
504 if (tc == stcc->tc)
505 {
506 stcc->down = GNUNET_YES;
507 stcc->tc = NULL;
508 }
509 return GNUNET_OK;
510}
511
512
513/**
514 * Called whenever a client is disconnected. Frees our
515 * resources associated with that client.
516 *
517 * @param cls closure, NULL
518 * @param client identification of the client
519 * @param app_ctx our `struct TransportClient`
520 */
521static void
522client_disconnect_cb (void *cls,
523 struct GNUNET_SERVICE_Client *client,
524 void *app_ctx)
525{
526 struct TransportClient *tc = app_ctx;
527 struct GST_BlacklistCheck *bc;
528
529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
530 "Client %p disconnected, cleaning up.\n",
531 tc);
532 if (NULL != active_stccs)
533 GNUNET_CONTAINER_multipeermap_iterate (active_stccs,
534 &mark_match_down,
535 tc);
536 for (struct AddressToStringContext *cur = a2s_head; NULL != cur;
537 cur = cur->next)
538 {
539 if (cur->tc == tc)
540 cur->tc = NULL;
541 }
542 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, tc);
543 switch (tc->type)
544 {
545 case CT_NONE:
546 break;
547
548 case CT_CORE:
549 break;
550
551 case CT_MONITOR:
552 break;
553
554 case CT_BLACKLIST:
555 for (bc = bc_head; NULL != bc; bc = bc->next)
556 {
557 if (bc->bl_pos != tc)
558 continue;
559 bc->bl_pos = tc->next;
560 if (NULL == bc->task)
561 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
562 }
563 break;
564
565 case CT_CORE_NO_HANDLERS:
566 break;
567 }
568 GNUNET_free (tc);
569}
570
571
572/**
573 * Function called for each of our connected neighbours. Notify the
574 * client about the existing neighbour.
575 *
576 * @param cls the `struct TransportClient *` to notify
577 * @param peer identity of the neighbour
578 * @param address the address
579 * @param state the current state of the peer
580 * @param state_timeout the time out for the state
581 * @param bandwidth_in inbound bandwidth in NBO
582 * @param bandwidth_out outbound bandwidth in NBO
583 */
584static void
585notify_client_about_neighbour (void *cls,
586 const struct GNUNET_PeerIdentity *peer,
587 const struct GNUNET_HELLO_Address *address,
588 enum GNUNET_TRANSPORT_PeerState state,
589 struct GNUNET_TIME_Absolute state_timeout,
590 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
591 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
592{
593 struct TransportClient *tc = cls;
594 struct ConnectInfoMessage cim;
595
596 if (GNUNET_NO == GST_neighbours_test_connected (peer))
597 return;
598 cim.header.size = htons (sizeof(struct ConnectInfoMessage));
599 cim.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT);
600 cim.id = *peer;
601 cim.quota_out = bandwidth_out;
602 unicast (tc, &cim.header, GNUNET_NO);
603}
604
605
606/**
607 * Initialize a normal client. We got a start message from this
608 * client, add it to the list of clients for broadcasting of inbound
609 * messages.
610 *
611 * @param cls the client
612 * @param start the start message that was sent
613 */
614static void
615handle_client_start (void *cls, const struct StartMessage *start)
616{
617 struct TransportClient *tc = cls;
618 const struct GNUNET_MessageHeader *hello;
619 uint32_t options;
620
621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %p sent START\n", tc);
622 options = ntohl (start->options);
623 if ((0 != (1 & options)) &&
624 (0 != memcmp (&start->self,
625 &GST_my_identity,
626 sizeof(struct GNUNET_PeerIdentity))))
627 {
628 /* client thinks this is a different peer, reject */
629 GNUNET_break (0);
630 GNUNET_SERVICE_client_drop (tc->client);
631 return;
632 }
633 if (CT_NONE != tc->type)
634 {
635 GNUNET_break (0);
636 GNUNET_SERVICE_client_drop (tc->client);
637 return;
638 }
639 if (0 != (2 & options))
640 tc->type = CT_CORE;
641 else
642 tc->type = CT_CORE_NO_HANDLERS;
643 hello = GST_hello_get ();
644 if (NULL != hello)
645 unicast (tc, hello, GNUNET_NO);
646 GST_neighbours_iterate (&notify_client_about_neighbour, tc);
647 GNUNET_SERVICE_client_continue (tc->client);
648}
649
650
651/**
652 * Client sent us a HELLO. Check the request.
653 *
654 * @param cls the client
655 * @param message the HELLO message
656 */
657static int
658check_client_hello (void *cls, const struct GNUNET_MessageHeader *message)
659{
660 return GNUNET_OK; /* FIXME: check here? */
661}
662
663
664/**
665 * Client sent us a HELLO. Process the request.
666 *
667 * @param cls the client
668 * @param message the HELLO message
669 */
670static void
671handle_client_hello (void *cls, const struct GNUNET_MessageHeader *message)
672{
673 struct TransportClient *tc = cls;
674
675 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Received HELLO message\n");
676 GST_validation_handle_hello (message);
677 GNUNET_SERVICE_client_continue (tc->client);
678}
679
680
681/**
682 * Function called after the transmission is done. Notify the client that it is
683 * OK to send the next message.
684 *
685 * @param cls closure
686 * @param success #GNUNET_OK on success, #GNUNET_NO on failure, #GNUNET_SYSERR if we're not connected
687 * @param bytes_payload bytes payload sent
688 * @param bytes_on_wire bytes sent on wire
689 */
690static void
691handle_send_transmit_continuation (void *cls,
692 int success,
693 size_t bytes_payload,
694 size_t bytes_on_wire)
695{
696 struct SendTransmitContinuationContext *stcc = cls;
697 struct SendOkMessage send_ok_msg;
698#ifdef ENABLE_TTD
699 struct GNUNET_TIME_Relative delay;
700 const struct GNUNET_HELLO_Address *addr;
701
702 delay = GNUNET_TIME_absolute_get_duration (stcc->send_time);
703 addr = GST_neighbour_get_current_address (&stcc->target);
704
705 if (delay.rel_value_us > GNUNET_CONSTANTS_LATENCY_WARN.rel_value_us)
706 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
707 "It took us %s to send %u/%u bytes to %s (%d, %s)\n",
708 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES),
709 (unsigned int) bytes_payload,
710 (unsigned int) bytes_on_wire,
711 GNUNET_i2s (&stcc->target),
712 success,
713 (NULL != addr) ? addr->transport_name : "%");
714 else
715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
716 "It took us %s to send %u/%u bytes to %s (%d, %s)\n",
717 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES),
718 (unsigned int) bytes_payload,
719 (unsigned int) bytes_on_wire,
720 GNUNET_i2s (&stcc->target),
721 success,
722 (NULL != addr) ? addr->transport_name : "%");
723#endif
724
725 if (GNUNET_NO == stcc->down)
726 {
727 /* Only send confirmation if we are still connected */
728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
729 "Sending SEND_OK for transmission request %llu\n",
730 stcc->uuid);
731 send_ok_msg.header.size = htons (sizeof(send_ok_msg));
732 send_ok_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK);
733 send_ok_msg.bytes_msg = htons (bytes_payload);
734 send_ok_msg.bytes_physical = htonl (bytes_on_wire);
735 send_ok_msg.success = htons (success);
736 send_ok_msg.peer = stcc->target;
737 unicast (stcc->tc, &send_ok_msg.header, GNUNET_NO);
738 }
739 GNUNET_assert (
740 GNUNET_OK ==
741 GNUNET_CONTAINER_multipeermap_remove (active_stccs, &stcc->target, stcc));
742 GNUNET_free (stcc);
743}
744
745
746/**
747 * Client asked for transmission to a peer. Process the request.
748 *
749 * @param cls the client
750 * @param obm the send message that was sent
751 */
752static int
753check_client_send (void *cls, const struct OutboundMessage *obm)
754{
755 uint16_t size;
756 const struct GNUNET_MessageHeader *obmm;
757
758 size = ntohs (obm->header.size) - sizeof(struct OutboundMessage);
759 if (size < sizeof(struct GNUNET_MessageHeader))
760 {
761 GNUNET_break (0);
762 return GNUNET_SYSERR;
763 }
764 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
765 if (size != ntohs (obmm->size))
766 {
767 GNUNET_break (0);
768 return GNUNET_SYSERR;
769 }
770 return GNUNET_OK;
771}
772
773
774/**
775 * Client asked for transmission to a peer. Process the request.
776 *
777 * @param cls the client
778 * @param obm the send message that was sent
779 */
780static void
781handle_client_send (void *cls, const struct OutboundMessage *obm)
782{
783 static unsigned long long uuid_gen;
784 struct TransportClient *tc = cls;
785 const struct GNUNET_MessageHeader *obmm;
786 struct SendTransmitContinuationContext *stcc;
787
788 obmm = (const struct GNUNET_MessageHeader *) &obm[1];
789 if (GNUNET_NO == GST_neighbours_test_connected (&obm->peer))
790 {
791 /* not connected, not allowed to send; can happen due to asynchronous operations */
792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
793 "Could not send message to peer `%s': not connected\n",
794 GNUNET_i2s (&obm->peer));
795 GNUNET_STATISTICS_update (
796 GST_stats,
797 gettext_noop ("# bytes payload dropped (other peer was not connected)"),
798 ntohs (obmm->size),
799 GNUNET_NO);
800 GNUNET_SERVICE_client_continue (tc->client);
801 return;
802 }
803 GNUNET_log (
804 GNUNET_ERROR_TYPE_DEBUG,
805 "Received SEND request %llu for `%s' and first message of type %u and total size %u\n",
806 uuid_gen,
807 GNUNET_i2s (&obm->peer),
808 ntohs (obmm->type),
809 ntohs (obmm->size));
810 GNUNET_SERVICE_client_continue (tc->client);
811
812 stcc = GNUNET_new (struct SendTransmitContinuationContext);
813 stcc->target = obm->peer;
814 stcc->tc = tc;
815 stcc->send_time = GNUNET_TIME_absolute_get ();
816 stcc->uuid = uuid_gen++;
817 (void) GNUNET_CONTAINER_multipeermap_put (
818 active_stccs,
819 &stcc->target,
820 stcc,
821 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
822 GST_manipulation_send (&obm->peer,
823 obmm,
824 ntohs (obmm->size),
825 GNUNET_TIME_relative_ntoh (obm->timeout),
826 &handle_send_transmit_continuation,
827 stcc);
828}
829
830
831/**
832 * Take the given address and append it to the set of results sent back to
833 * the client. This function may be called several times for a single
834 * conversion. The last invocation will be with a @a address of
835 * NULL and a @a res of #GNUNET_OK. Thus, to indicate conversion
836 * errors, the callback might be called first with @a address NULL and
837 * @a res being #GNUNET_SYSERR. In that case, there will still be a
838 * subsequent call later with @a address NULL and @a res #GNUNET_OK.
839 *
840 * @param cls the `struct AddressToStringContext`
841 * @param buf text to transmit (contains the human-readable address, or NULL)
842 * @param res #GNUNET_OK if conversion was successful, #GNUNET_SYSERR on error,
843 * never #GNUNET_NO
844 */
845static void
846transmit_address_to_client (void *cls, const char *buf, int res)
847{
848 struct AddressToStringContext *actx = cls;
849 struct GNUNET_MQ_Envelope *env;
850 struct AddressToStringResultMessage *atsm;
851 size_t slen;
852
853 GNUNET_assert ((GNUNET_OK == res) || (GNUNET_SYSERR == res));
854 if (NULL == actx->tc)
855 return;
856 if (NULL == buf)
857 {
858 env = GNUNET_MQ_msg (atsm,
859 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
860 if (GNUNET_OK == res)
861 {
862 /* this was the last call, transmit */
863 atsm->res = htonl (GNUNET_OK);
864 atsm->addr_len = htonl (0);
865 GNUNET_MQ_send (actx->tc->mq, env);
866 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, actx);
867 GNUNET_free (actx);
868 return;
869 }
870 if (GNUNET_SYSERR == res)
871 {
872 /* address conversion failed, but there will be more callbacks */
873 atsm->res = htonl (GNUNET_SYSERR);
874 atsm->addr_len = htonl (0);
875 GNUNET_MQ_send (actx->tc->mq, env);
876 return;
877 }
878 }
879 GNUNET_assert (GNUNET_OK == res);
880 /* successful conversion, append*/
881 slen = strlen (buf) + 1;
882 env =
883 GNUNET_MQ_msg_extra (atsm,
884 slen,
885 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
886 atsm->res = htonl (GNUNET_YES);
887 atsm->addr_len = htonl (slen);
888 GNUNET_memcpy (&atsm[1], buf, slen);
889 GNUNET_MQ_send (actx->tc->mq, env);
890}
891
892
893/**
894 * Client asked to resolve an address. Check the request.
895 *
896 * @param cls the client
897 * @param alum the resolution request
898 * @return #GNUNET_OK if @a alum is well-formed
899 */
900static int
901check_client_address_to_string (void *cls,
902 const struct AddressLookupMessage *alum)
903{
904 const char *plugin_name;
905 const char *address;
906 uint32_t address_len;
907 uint16_t size;
908
909 size = ntohs (alum->header.size);
910 address_len = ntohs (alum->addrlen);
911 if (size <= sizeof(struct AddressLookupMessage) + address_len)
912 {
913 GNUNET_break (0);
914 return GNUNET_SYSERR;
915 }
916 address = (const char *) &alum[1];
917 plugin_name = (const char *) &address[address_len];
918 if ('\0' != plugin_name[size - sizeof(struct AddressLookupMessage)
919 - address_len - 1])
920 {
921 GNUNET_break (0);
922 return GNUNET_SYSERR;
923 }
924 return GNUNET_OK;
925}
926
927
928/**
929 * Client asked to resolve an address. Process the request.
930 *
931 * @param cls the client
932 * @param alum the resolution request
933 */
934static void
935handle_client_address_to_string (void *cls,
936 const struct AddressLookupMessage *alum)
937{
938 struct TransportClient *tc = cls;
939 struct GNUNET_TRANSPORT_PluginFunctions *papi;
940 const char *plugin_name;
941 const char *address;
942 uint32_t address_len;
943 struct AddressToStringContext *actx;
944 struct GNUNET_MQ_Envelope *env;
945 struct AddressToStringResultMessage *atsm;
946 struct GNUNET_TIME_Relative rtimeout;
947 int32_t numeric;
948
949 address_len = ntohs (alum->addrlen);
950 address = (const char *) &alum[1];
951 plugin_name = (const char *) &address[address_len];
952 rtimeout = GNUNET_TIME_relative_ntoh (alum->timeout);
953 numeric = ntohs (alum->numeric_only);
954 papi = GST_plugins_printer_find (plugin_name);
955 if (NULL == papi)
956 {
957 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
958 "Failed to find plugin `%s'\n",
959 plugin_name);
960 env = GNUNET_MQ_msg (atsm,
961 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
962 atsm->res = htonl (GNUNET_SYSERR);
963 atsm->addr_len = htonl (0);
964 GNUNET_MQ_send (tc->mq, env);
965 env = GNUNET_MQ_msg (atsm,
966 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING_REPLY);
967 atsm->res = htonl (GNUNET_OK);
968 atsm->addr_len = htonl (0);
969 GNUNET_MQ_send (tc->mq, env);
970 return;
971 }
972 actx = GNUNET_new (struct AddressToStringContext);
973 actx->tc = tc;
974 GNUNET_CONTAINER_DLL_insert (a2s_head, a2s_tail, actx);
975 GNUNET_SERVICE_client_disable_continue_warning (tc->client);
976 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
977 "Pretty-printing address of %u bytes using plugin `%s'\n",
978 address_len,
979 plugin_name);
980 papi->address_pretty_printer (papi->cls,
981 plugin_name,
982 address,
983 address_len,
984 numeric,
985 rtimeout,
986 &transmit_address_to_client,
987 actx);
988}
989
990
991/**
992 * Compose #PeerIterateResponseMessage using the given peer and address.
993 *
994 * @param peer identity of the peer
995 * @param address the address, NULL on disconnect
996 * @return composed message
997 */
998static struct PeerIterateResponseMessage *
999compose_address_iterate_response_message (
1000 const struct GNUNET_PeerIdentity *peer,
1001 const struct GNUNET_HELLO_Address *address)
1002{
1003 struct PeerIterateResponseMessage *msg;
1004 size_t size;
1005 size_t tlen;
1006 size_t alen;
1007 char *addr;
1008
1009 GNUNET_assert (NULL != peer);
1010 if (NULL != address)
1011 {
1012 tlen = strlen (address->transport_name) + 1;
1013 alen = address->address_length;
1014 }
1015 else
1016 {
1017 tlen = 0;
1018 alen = 0;
1019 }
1020 size = (sizeof(struct PeerIterateResponseMessage) + alen + tlen);
1021 msg = GNUNET_malloc (size);
1022 msg->header.size = htons (size);
1023 msg->header.type =
1024 htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_RESPONSE);
1025 msg->reserved = htonl (0);
1026 msg->peer = *peer;
1027 msg->addrlen = htonl (alen);
1028 msg->pluginlen = htonl (tlen);
1029
1030 if (NULL != address)
1031 {
1032 msg->local_address_info = htonl ((uint32_t) address->local_info);
1033 addr = (char *) &msg[1];
1034 GNUNET_memcpy (addr, address->address, alen);
1035 GNUNET_memcpy (&addr[alen], address->transport_name, tlen);
1036 }
1037 return msg;
1038}
1039
1040
1041/**
1042 * Context for #send_validation_information() and
1043 * #send_peer_information().
1044 */
1045struct IterationContext
1046{
1047 /**
1048 * Context to use for the transmission.
1049 */
1050 struct TransportClient *tc;
1051
1052 /**
1053 * Which peers do we care about?
1054 */
1055 struct GNUNET_PeerIdentity id;
1056
1057 /**
1058 * #GNUNET_YES if @e id should be ignored because we want all peers.
1059 */
1060 int all;
1061};
1062
1063
1064/**
1065 * Output information of neighbours to the given client.
1066 *
1067 * @param cls the `struct PeerIterationContext *`
1068 * @param peer identity of the neighbour
1069 * @param address the address
1070 * @param state current state this peer is in
1071 * @param state_timeout timeout for the current state of the peer
1072 * @param bandwidth_in inbound quota in NBO
1073 * @param bandwidth_out outbound quota in NBO
1074 */
1075static void
1076send_peer_information (void *cls,
1077 const struct GNUNET_PeerIdentity *peer,
1078 const struct GNUNET_HELLO_Address *address,
1079 enum GNUNET_TRANSPORT_PeerState state,
1080 struct GNUNET_TIME_Absolute state_timeout,
1081 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1082 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
1083{
1084 struct IterationContext *pc = cls;
1085 struct GNUNET_MQ_Envelope *env;
1086 struct PeerIterateResponseMessage *msg;
1087
1088 if ((GNUNET_YES != pc->all) && (0 != memcmp (peer, &pc->id, sizeof(pc->id))))
1089 return;
1090 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1091 "Sending information about `%s' using address `%s' in state `%s'\n",
1092 GNUNET_i2s (peer),
1093 (NULL != address) ? GST_plugins_a2s (address) : "<none>",
1094 GNUNET_TRANSPORT_ps2s (state));
1095 msg = compose_address_iterate_response_message (peer, address);
1096 msg->state = htonl (state);
1097 msg->state_timeout = GNUNET_TIME_absolute_hton (state_timeout);
1098 env = GNUNET_MQ_msg_copy (&msg->header);
1099 GNUNET_free (msg);
1100 GNUNET_MQ_send (pc->tc->mq, env);
1101}
1102
1103
1104/**
1105 * Client asked to obtain information about a specific or all peers
1106 * Process the request.
1107 *
1108 * @param cls the client
1109 * @param msg the peer address information request
1110 */
1111static void
1112handle_client_monitor_peers (void *cls, const struct PeerMonitorMessage *msg)
1113{
1114 struct TransportClient *tc = cls;
1115 struct IterationContext pc;
1116
1117 if (CT_NONE != tc->type)
1118 {
1119 GNUNET_break (0);
1120 GNUNET_SERVICE_client_drop (tc->client);
1121 return;
1122 }
1123 GNUNET_SERVICE_client_disable_continue_warning (tc->client);
1124 GNUNET_SERVICE_client_mark_monitor (tc->client);
1125
1126 /* Send initial list */
1127 pc.tc = tc;
1128 if (0 == memcmp (&msg->peer, &all_zeros, sizeof(struct GNUNET_PeerIdentity)))
1129 {
1130 /* iterate over all neighbours */
1131 pc.all = GNUNET_YES;
1132 pc.id = msg->peer;
1133 }
1134 else
1135 {
1136 /* just return one neighbour */
1137 pc.all = GNUNET_NO;
1138 pc.id = msg->peer;
1139 }
1140 GST_neighbours_iterate (&send_peer_information, &pc);
1141
1142 if (GNUNET_YES != ntohl (msg->one_shot))
1143 {
1144 tc->details.monitor_peer = msg->peer;
1145 tc->type = CT_MONITOR;
1146 if (0 !=
1147 memcmp (&msg->peer, &all_zeros, sizeof(struct GNUNET_PeerIdentity)))
1148 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1149 "Client %p started monitoring of the peer `%s'\n",
1150 tc,
1151 GNUNET_i2s (&msg->peer));
1152 else
1153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1154 "Client %p started monitoring all peers\n",
1155 tc);
1156 }
1157 else
1158 {
1159 struct GNUNET_MessageHeader *msg;
1160 struct GNUNET_MQ_Envelope *env;
1161
1162 env =
1163 GNUNET_MQ_msg (msg,
1164 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_RESPONSE_END);
1165 GNUNET_MQ_send (tc->mq, env);
1166 }
1167}
1168
1169
1170/**
1171 * Function called by the plugin with information about the
1172 * current sessions managed by the plugin (for monitoring).
1173 *
1174 * @param cls closure
1175 * @param session session handle this information is about,
1176 * NULL to indicate that we are "in sync" (initial
1177 * iteration complete)
1178 * @param info information about the state of the session,
1179 * NULL if @a session is also NULL and we are
1180 * merely signalling that the initial iteration is over
1181 */
1182static void
1183plugin_session_info_cb (void *cls,
1184 struct GNUNET_ATS_Session *session,
1185 const struct GNUNET_TRANSPORT_SessionInfo *info)
1186{
1187 struct GNUNET_MQ_Envelope *env;
1188 struct TransportPluginMonitorMessage *msg;
1189 struct GNUNET_MessageHeader *sync;
1190 size_t size;
1191 size_t slen;
1192 uint16_t alen;
1193 char *name;
1194 char *addr;
1195
1196 if (0 == GNUNET_notification_context_get_size (plugin_nc))
1197 {
1198 GST_plugins_monitor_subscribe (NULL, NULL);
1199 return;
1200 }
1201 if ((NULL == info) && (NULL == session))
1202 {
1203 /* end of initial iteration */
1204 if (NULL != sync_client)
1205 {
1206 env =
1207 GNUNET_MQ_msg (sync, GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_SYNC);
1208 GNUNET_MQ_send (sync_client->mq, env);
1209 sync_client = NULL;
1210 }
1211 return;
1212 }
1213 GNUNET_assert (NULL != info);
1214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1215 "Plugin event for peer %s on transport %s\n",
1216 GNUNET_i2s (&info->address->peer),
1217 info->address->transport_name);
1218 slen = strlen (info->address->transport_name) + 1;
1219 alen = info->address->address_length;
1220 size = sizeof(struct TransportPluginMonitorMessage) + slen + alen;
1221 if (size > UINT16_MAX)
1222 {
1223 GNUNET_break (0);
1224 return;
1225 }
1226 msg = GNUNET_malloc (size);
1227 msg->header.size = htons (size);
1228 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_EVENT);
1229 msg->session_state = htons ((uint16_t) info->state);
1230 msg->is_inbound = htons ((int16_t) info->is_inbound);
1231 msg->msgs_pending = htonl (info->num_msg_pending);
1232 msg->bytes_pending = htonl (info->num_bytes_pending);
1233 msg->timeout = GNUNET_TIME_absolute_hton (info->session_timeout);
1234 msg->delay = GNUNET_TIME_absolute_hton (info->receive_delay);
1235 msg->peer = info->address->peer;
1236 msg->session_id = (uint64_t) (intptr_t) session;
1237 msg->plugin_name_len = htons (slen);
1238 msg->plugin_address_len = htons (alen);
1239 name = (char *) &msg[1];
1240 GNUNET_memcpy (name, info->address->transport_name, slen);
1241 addr = &name[slen];
1242 GNUNET_memcpy (addr, info->address->address, alen);
1243 if (NULL != sync_client)
1244 {
1245 struct GNUNET_MQ_Envelope *env;
1246
1247 env = GNUNET_MQ_msg_copy (&msg->header);
1248 GNUNET_MQ_send (sync_client->mq, env);
1249 }
1250 else
1251 {
1252 GNUNET_notification_context_broadcast (plugin_nc, &msg->header, GNUNET_NO);
1253 }
1254 GNUNET_free (msg);
1255}
1256
1257
1258/**
1259 * Client asked to obtain information about all plugin connections.
1260 *
1261 * @param cls the client
1262 * @param message the peer address information request
1263 */
1264static void
1265handle_client_monitor_plugins (void *cls,
1266 const struct GNUNET_MessageHeader *message)
1267{
1268 struct TransportClient *tc = cls;
1269
1270 GNUNET_SERVICE_client_mark_monitor (tc->client);
1271 GNUNET_SERVICE_client_disable_continue_warning (tc->client);
1272 GNUNET_notification_context_add (plugin_nc, tc->mq);
1273 GNUNET_assert (NULL == sync_client);
1274 sync_client = tc;
1275 GST_plugins_monitor_subscribe (&plugin_session_info_cb, NULL);
1276}
1277
1278
1279/**
1280 * Broadcast the given message to all of our clients.
1281 *
1282 * @param msg message to broadcast
1283 * @param may_drop #GNUNET_YES if the message can be dropped / is payload
1284 */
1285void
1286GST_clients_broadcast (const struct GNUNET_MessageHeader *msg, int may_drop)
1287{
1288 int done;
1289
1290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1291 "Asked to broadcast message of type %u with %u bytes\n",
1292 (unsigned int) ntohs (msg->type),
1293 (unsigned int) ntohs (msg->size));
1294 done = GNUNET_NO;
1295 for (struct TransportClient *tc = clients_head; NULL != tc; tc = tc->next)
1296 {
1297 if (CT_NONE == tc->type)
1298 continue; /* client not yet ready */
1299 if ((GNUNET_YES == may_drop) && (CT_CORE != tc->type))
1300 continue; /* skip, this client does not care about payload */
1301 unicast (tc, msg, may_drop);
1302 done = GNUNET_YES;
1303 }
1304 if (GNUNET_NO == done)
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Message of type %u not delivered, is CORE service up?\n",
1307 ntohs (msg->type));
1308}
1309
1310
1311/**
1312 * Broadcast the new active address to all clients monitoring the peer.
1313 *
1314 * @param peer peer this update is about (never NULL)
1315 * @param address address, NULL on disconnect
1316 * @param state the current state of the peer
1317 * @param state_timeout the time out for the state
1318 */
1319void
1320GST_clients_broadcast_peer_notification (
1321 const struct GNUNET_PeerIdentity *peer,
1322 const struct GNUNET_HELLO_Address *address,
1323 enum GNUNET_TRANSPORT_PeerState state,
1324 struct GNUNET_TIME_Absolute state_timeout)
1325{
1326 struct GNUNET_MQ_Envelope *env;
1327 struct PeerIterateResponseMessage *msg;
1328
1329 msg = compose_address_iterate_response_message (peer, address);
1330 msg->state = htonl (state);
1331 msg->state_timeout = GNUNET_TIME_absolute_hton (state_timeout);
1332 for (struct TransportClient *tc = clients_head; NULL != tc; tc = tc->next)
1333 {
1334 if (CT_MONITOR != tc->type)
1335 continue;
1336 if ((0 == memcmp (&tc->details.monitor_peer,
1337 &all_zeros,
1338 sizeof(struct GNUNET_PeerIdentity))) ||
1339 (0 == memcmp (&tc->details.monitor_peer,
1340 peer,
1341 sizeof(struct GNUNET_PeerIdentity))))
1342 {
1343 env = GNUNET_MQ_msg_copy (&msg->header);
1344 GNUNET_MQ_send (tc->mq, env);
1345 }
1346 }
1347 GNUNET_free (msg);
1348}
1349
1350
1351/**
1352 * Mark the peer as down so we don't call the continuation
1353 * context in the future.
1354 *
1355 * @param cls NULL
1356 * @param peer peer that got disconnected
1357 * @param value a `struct SendTransmitContinuationContext` to mark
1358 * @return #GNUNET_OK (continue to iterate)
1359 */
1360static int
1361mark_peer_down (void *cls, const struct GNUNET_PeerIdentity *peer, void *value)
1362{
1363 struct SendTransmitContinuationContext *stcc = value;
1364
1365 stcc->down = GNUNET_YES;
1366 return GNUNET_OK;
1367}
1368
1369
1370/**
1371 * Notify all clients about a disconnect, and cancel
1372 * pending SEND_OK messages for this peer.
1373 *
1374 * @param peer peer that disconnected
1375 */
1376void
1377GST_clients_broadcast_disconnect (const struct GNUNET_PeerIdentity *peer)
1378{
1379 struct DisconnectInfoMessage disconnect_msg;
1380
1381 GNUNET_CONTAINER_multipeermap_get_multiple (active_stccs,
1382 peer,
1383 &mark_peer_down,
1384 NULL);
1385 disconnect_msg.header.size = htons (sizeof(struct DisconnectInfoMessage));
1386 disconnect_msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT);
1387 disconnect_msg.reserved = htonl (0);
1388 disconnect_msg.peer = *peer;
1389 GST_clients_broadcast (&disconnect_msg.header, GNUNET_NO);
1390}
1391
1392
1393/**
1394 * Transmit our HELLO message to the given (connected) neighbour.
1395 *
1396 * @param cls the 'HELLO' message
1397 * @param peer identity of the peer
1398 * @param address the address
1399 * @param state current state this peer is in
1400 * @param state_timeout timeout for the current state of the peer
1401 * @param bandwidth_in inbound quota in NBO
1402 * @param bandwidth_out outbound quota in NBO
1403 */
1404static void
1405transmit_our_hello (void *cls,
1406 const struct GNUNET_PeerIdentity *peer,
1407 const struct GNUNET_HELLO_Address *address,
1408 enum GNUNET_TRANSPORT_PeerState state,
1409 struct GNUNET_TIME_Absolute state_timeout,
1410 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1411 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
1412{
1413 const struct GNUNET_MessageHeader *hello = cls;
1414
1415 if (0 == memcmp (peer, &GST_my_identity, sizeof(struct GNUNET_PeerIdentity)))
1416 return; /* not to ourselves */
1417 if (GNUNET_NO == GST_neighbours_test_connected (peer))
1418 return;
1419
1420 GST_neighbours_send (peer,
1421 hello,
1422 ntohs (hello->size),
1423 hello_expiration,
1424 NULL,
1425 NULL);
1426}
1427
1428
1429/**
1430 * My HELLO has changed. Tell everyone who should know.
1431 *
1432 * @param cls unused
1433 * @param hello new HELLO
1434 */
1435static void
1436process_hello_update (void *cls, const struct GNUNET_MessageHeader *hello)
1437{
1438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Broadcasting HELLO to clients\n");
1439 GST_clients_broadcast (hello, GNUNET_NO);
1440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Broadcasting HELLO to neighbours\n");
1441 GST_neighbours_iterate (&transmit_our_hello, (void *) hello);
1442}
1443
1444
1445/**
1446 * We received some payload. Prepare to pass it on to our clients.
1447 *
1448 * @param address address and (claimed) identity of the other peer
1449 * @param session identifier used for this session (NULL for plugins
1450 * that do not offer bi-directional communication to the sender
1451 * using the same "connection")
1452 * @param message the message to process
1453 * @return how long the plugin should wait until receiving more data
1454 */
1455static struct GNUNET_TIME_Relative
1456process_payload (const struct GNUNET_HELLO_Address *address,
1457 struct GNUNET_ATS_Session *session,
1458 const struct GNUNET_MessageHeader *message)
1459{
1460 struct GNUNET_TIME_Relative ret;
1461 int do_forward;
1462 struct InboundMessage *im;
1463 size_t msg_size = ntohs (message->size);
1464 size_t size = sizeof(struct InboundMessage) + msg_size;
1465 char buf[size] GNUNET_ALIGN;
1466
1467 do_forward = GNUNET_SYSERR;
1468 ret = GST_neighbours_calculate_receive_delay (&address->peer,
1469 msg_size,
1470 &do_forward);
1471 if (! GST_neighbours_test_connected (&address->peer))
1472 {
1473 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1474 "Discarded %u bytes type %u payload from peer `%s'\n",
1475 (unsigned int) msg_size,
1476 ntohs (message->type),
1477 GNUNET_i2s (&address->peer));
1478 GNUNET_STATISTICS_update (
1479 GST_stats,
1480 gettext_noop ("# bytes payload discarded due to not connected peer"),
1481 msg_size,
1482 GNUNET_NO);
1483 return ret;
1484 }
1485
1486 if (GNUNET_YES != do_forward)
1487 return ret;
1488 im = (struct InboundMessage *) buf;
1489 im->header.size = htons (size);
1490 im->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_RECV);
1491 im->peer = address->peer;
1492 GNUNET_memcpy (&im[1], message, ntohs (message->size));
1493 GST_clients_broadcast (&im->header, GNUNET_YES);
1494 return ret;
1495}
1496
1497
1498/**
1499 * Task to asynchronously terminate a session.
1500 *
1501 * @param cls the `struct GNUNET_ATS_SessionKiller` with the information for the kill
1502 */
1503static void
1504kill_session_task (void *cls)
1505{
1506 struct GNUNET_ATS_SessionKiller *sk = cls;
1507
1508 sk->task = NULL;
1509 GNUNET_CONTAINER_DLL_remove (sk_head, sk_tail, sk);
1510 sk->plugin->disconnect_session (sk->plugin->cls, sk->session);
1511 GNUNET_free (sk);
1512}
1513
1514
1515/**
1516 * Force plugin to terminate session due to communication
1517 * issue.
1518 *
1519 * @param plugin_name name of the plugin
1520 * @param session session to termiante
1521 */
1522static void
1523kill_session (const char *plugin_name, struct GNUNET_ATS_Session *session)
1524{
1525 struct GNUNET_TRANSPORT_PluginFunctions *plugin;
1526 struct GNUNET_ATS_SessionKiller *sk;
1527
1528 for (sk = sk_head; NULL != sk; sk = sk->next)
1529 if (sk->session == session)
1530 return;
1531 plugin = GST_plugins_find (plugin_name);
1532 if (NULL == plugin)
1533 {
1534 GNUNET_break (0);
1535 return;
1536 }
1537 /* need to issue disconnect asynchronously */
1538 sk = GNUNET_new (struct GNUNET_ATS_SessionKiller);
1539 sk->session = session;
1540 sk->plugin = plugin;
1541 sk->task = GNUNET_SCHEDULER_add_now (&kill_session_task, sk);
1542 GNUNET_CONTAINER_DLL_insert (sk_head, sk_tail, sk);
1543}
1544
1545
1546/**
1547 * Black list check result for try_connect call
1548 * If connection to the peer is allowed request address and ???
1549 *
1550 * @param cls the message
1551 * @param peer the peer
1552 * @param address the address
1553 * @param session the session
1554 * @param result the result
1555 */
1556static void
1557connect_bl_check_cont (void *cls,
1558 const struct GNUNET_PeerIdentity *peer,
1559 const struct GNUNET_HELLO_Address *address,
1560 struct GNUNET_ATS_Session *session,
1561 int result)
1562{
1563 struct GNUNET_MessageHeader *msg = cls;
1564
1565 if (GNUNET_OK == result)
1566 {
1567 /* Blacklist allows to speak to this peer, forward SYN to neighbours */
1568 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1569 "Received SYN message from peer `%s' at `%s'\n",
1570 GNUNET_i2s (peer),
1571 GST_plugins_a2s (address));
1572 if (GNUNET_OK != GST_neighbours_handle_session_syn (msg, peer))
1573 {
1574 GST_blacklist_abort_matching (address, session);
1575 kill_session (address->transport_name, session);
1576 }
1577 GNUNET_free (msg);
1578 return;
1579 }
1580 GNUNET_free (msg);
1581 if (GNUNET_SYSERR == result)
1582 return; /* check was aborted, session destroyed */
1583 /* Blacklist denies to speak to this peer */
1584 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1585 "Discarding SYN message from `%s' due to denied blacklist check\n",
1586 GNUNET_i2s (peer));
1587 kill_session (address->transport_name, session);
1588}
1589
1590
1591/**
1592 * Function called by the transport for each received message.
1593 *
1594 * @param cls closure, const char* with the name of the plugin we received the message from
1595 * @param address address and (claimed) identity of the other peer
1596 * @param message the message, NULL if we only care about
1597 * learning about the delay until we should receive again
1598 * @param session identifier used for this session (NULL for plugins
1599 * that do not offer bi-directional communication to the sender
1600 * using the same "connection")
1601 * @return how long the plugin should wait until receiving more data
1602 * (plugins that do not support this, can ignore the return value)
1603 */
1604struct GNUNET_TIME_Relative
1605GST_receive_callback (void *cls,
1606 const struct GNUNET_HELLO_Address *address,
1607 struct GNUNET_ATS_Session *session,
1608 const struct GNUNET_MessageHeader *message)
1609{
1610 const char *plugin_name = cls;
1611 struct GNUNET_TIME_Relative ret;
1612 uint16_t type;
1613
1614 ret = GNUNET_TIME_UNIT_ZERO;
1615 if (NULL == message)
1616 goto end;
1617 type = ntohs (message->type);
1618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1619 "Received message with type %u from peer `%s' at %s\n",
1620 type,
1621 GNUNET_i2s (&address->peer),
1622 GST_plugins_a2s (address));
1623
1624 GNUNET_STATISTICS_update (GST_stats,
1625 gettext_noop ("# bytes total received"),
1626 ntohs (message->size),
1627 GNUNET_NO);
1628 GST_neighbours_notify_data_recv (address, message);
1629 switch (type)
1630 {
1631 case GNUNET_MESSAGE_TYPE_HELLO_URI:
1632 /* Future HELLO message, discard */
1633 return ret;
1634
1635 case GNUNET_MESSAGE_TYPE_HELLO:
1636 if (GNUNET_OK != GST_validation_handle_hello (message))
1637 {
1638 GNUNET_break_op (0);
1639 GST_blacklist_abort_matching (address, session);
1640 }
1641 return ret;
1642
1643 case GNUNET_MESSAGE_TYPE_TRANSPORT_PING:
1644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1645 "Processing PING from `%s'\n",
1646 GST_plugins_a2s (address));
1647 if (GNUNET_OK !=
1648 GST_validation_handle_ping (&address->peer, message, address, session))
1649 {
1650 GST_blacklist_abort_matching (address, session);
1651 kill_session (plugin_name, session);
1652 }
1653 break;
1654
1655 case GNUNET_MESSAGE_TYPE_TRANSPORT_PONG:
1656 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1657 "Processing PONG from `%s'\n",
1658 GST_plugins_a2s (address));
1659 if (GNUNET_OK != GST_validation_handle_pong (&address->peer, message))
1660 {
1661 GNUNET_break_op (0);
1662 GST_blacklist_abort_matching (address, session);
1663 kill_session (plugin_name, session);
1664 }
1665 break;
1666
1667 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN:
1668 /* Do blacklist check if communication with this peer is allowed */
1669 (void) GST_blacklist_test_allowed (&address->peer,
1670 NULL,
1671 &connect_bl_check_cont,
1672 GNUNET_copy_message (message),
1673 address,
1674 session);
1675 break;
1676
1677 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_SYN_ACK:
1678 if (GNUNET_OK !=
1679 GST_neighbours_handle_session_syn_ack (message, address, session))
1680 {
1681 GST_blacklist_abort_matching (address, session);
1682 kill_session (plugin_name, session);
1683 }
1684 break;
1685
1686 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_ACK:
1687 if (GNUNET_OK !=
1688 GST_neighbours_handle_session_ack (message, address, session))
1689 {
1690 GNUNET_break_op (0);
1691 GST_blacklist_abort_matching (address, session);
1692 kill_session (plugin_name, session);
1693 }
1694 break;
1695
1696 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_DISCONNECT:
1697 GST_neighbours_handle_disconnect_message (&address->peer, message);
1698 break;
1699
1700 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_QUOTA:
1701 GST_neighbours_handle_quota_message (&address->peer, message);
1702 break;
1703
1704 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE:
1705 GST_neighbours_keepalive (&address->peer, message);
1706 break;
1707
1708 case GNUNET_MESSAGE_TYPE_TRANSPORT_SESSION_KEEPALIVE_RESPONSE:
1709 GST_neighbours_keepalive_response (&address->peer, message);
1710 break;
1711
1712 default:
1713 /* should be payload */
1714 GNUNET_STATISTICS_update (GST_stats,
1715 gettext_noop ("# bytes payload received"),
1716 ntohs (message->size),
1717 GNUNET_NO);
1718 ret = process_payload (address, session, message);
1719 break;
1720 }
1721end:
1722 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1723 "Allowing receive from peer %s to continue in %s\n",
1724 GNUNET_i2s (&address->peer),
1725 GNUNET_STRINGS_relative_time_to_string (ret, GNUNET_YES));
1726 return ret;
1727}
1728
1729
1730/**
1731 * Function that will be called for each address the transport
1732 * is aware that it might be reachable under. Update our HELLO.
1733 *
1734 * @param cls name of the plugin (const char*)
1735 * @param add_remove should the address added (YES) or removed (NO) from the
1736 * set of valid addresses?
1737 * @param address the address to add or remove
1738 */
1739static void
1740plugin_env_address_change_notification (
1741 void *cls,
1742 int add_remove,
1743 const struct GNUNET_HELLO_Address *address)
1744{
1745 static int addresses = 0;
1746
1747 if (GNUNET_YES == add_remove)
1748 {
1749 addresses++;
1750 GNUNET_STATISTICS_update (GST_stats, "# transport addresses", 1, GNUNET_NO);
1751 }
1752 else if (GNUNET_NO == add_remove)
1753 {
1754 if (0 == addresses)
1755 {
1756 GNUNET_break (0);
1757 }
1758 else
1759 {
1760 addresses--;
1761 GNUNET_STATISTICS_update (GST_stats,
1762 "# transport addresses",
1763 -1,
1764 GNUNET_NO);
1765 }
1766 }
1767 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1768 "Transport now has %u addresses to communicate\n",
1769 addresses);
1770 GST_hello_modify_addresses (add_remove, address);
1771}
1772
1773
1774/**
1775 * Function that will be called whenever the plugin internally
1776 * cleans up a session pointer and hence the service needs to
1777 * discard all of those sessions as well. Plugins that do not
1778 * use sessions can simply omit calling this function and always
1779 * use NULL wherever a session pointer is needed. This function
1780 * should be called BEFORE a potential "TransmitContinuation"
1781 * from the "TransmitFunction".
1782 *
1783 * @param cls closure
1784 * @param address which address was the session for
1785 * @param session which session is being destroyed
1786 */
1787static void
1788plugin_env_session_end (void *cls,
1789 const struct GNUNET_HELLO_Address *address,
1790 struct GNUNET_ATS_Session *session)
1791{
1792 struct GNUNET_ATS_SessionKiller *sk;
1793
1794 if (NULL == address)
1795 {
1796 GNUNET_break (0);
1797 return;
1798 }
1799 if (NULL == session)
1800 {
1801 GNUNET_break (0);
1802 return;
1803 }
1804 GNUNET_assert (strlen (address->transport_name) > 0);
1805
1806 GNUNET_log (
1807 GNUNET_ERROR_TYPE_DEBUG,
1808 "Notification from plugin about terminated session %p from peer `%s' address `%s'\n",
1809 session,
1810 GNUNET_i2s (&address->peer),
1811 GST_plugins_a2s (address));
1812
1813 GST_neighbours_session_terminated (&address->peer, session);
1814 GST_ats_del_session (address, session);
1815 GST_blacklist_abort_matching (address, session);
1816
1817 for (sk = sk_head; NULL != sk; sk = sk->next)
1818 {
1819 if (sk->session == session)
1820 {
1821 GNUNET_CONTAINER_DLL_remove (sk_head, sk_tail, sk);
1822 GNUNET_SCHEDULER_cancel (sk->task);
1823 GNUNET_free (sk);
1824 break;
1825 }
1826 }
1827}
1828
1829
1830/**
1831 * Black list check result from blacklist check triggered when a
1832 * plugin gave us a new session in #plugin_env_session_start(). If
1833 * connection to the peer is disallowed, kill the session.
1834 *
1835 * @param cls NULL
1836 * @param peer the peer
1837 * @param address address associated with the request
1838 * @param session session associated with the request
1839 * @param result the result
1840 */
1841static void
1842plugin_env_session_start_bl_check_cont (
1843 void *cls,
1844 const struct GNUNET_PeerIdentity *peer,
1845 const struct GNUNET_HELLO_Address *address,
1846 struct GNUNET_ATS_Session *session,
1847 int result)
1848{
1849 if (GNUNET_OK != result)
1850 {
1851 kill_session (address->transport_name, session);
1852 return;
1853 }
1854 if (GNUNET_YES !=
1855 GNUNET_HELLO_address_check_option (address,
1856 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1857 {
1858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1859 "Informing verifier about inbound session's address `%s'\n",
1860 GST_plugins_a2s (address));
1861 GST_validation_handle_address (address);
1862 }
1863}
1864
1865
1866/**
1867 * Plugin tells transport service about a new inbound session
1868 *
1869 * @param cls unused
1870 * @param address the address
1871 * @param session the new session
1872 * @param scope network scope information
1873 */
1874static void
1875plugin_env_session_start (void *cls,
1876 const struct GNUNET_HELLO_Address *address,
1877 struct GNUNET_ATS_Session *session,
1878 enum GNUNET_NetworkType scope)
1879{
1880 struct GNUNET_ATS_Properties prop;
1881
1882 if (NULL == address)
1883 {
1884 GNUNET_break (0);
1885 return;
1886 }
1887 if (NULL == session)
1888 {
1889 GNUNET_break (0);
1890 return;
1891 }
1892 GNUNET_log (
1893 GNUNET_ERROR_TYPE_INFO,
1894 "Notification from plugin `%s' about new session from peer `%s' address `%s'\n",
1895 address->transport_name,
1896 GNUNET_i2s (&address->peer),
1897 GST_plugins_a2s (address));
1898 if (GNUNET_YES ==
1899 GNUNET_HELLO_address_check_option (address,
1900 GNUNET_HELLO_ADDRESS_INFO_INBOUND))
1901 {
1902 /* inbound is always new, but outbound MAY already be known, but
1903 for example for UNIX, we have symmetric connections and thus we
1904 may not know the address yet; add if necessary! */
1905 /* FIXME: maybe change API here so we just pass scope? */
1906 memset (&prop, 0, sizeof(prop));
1907 GNUNET_break (GNUNET_NT_UNSPECIFIED != scope);
1908 prop.scope = scope;
1909 GST_ats_add_inbound_address (address, session, &prop);
1910 }
1911 /* Do blacklist check if communication with this peer is allowed */
1912 (void) GST_blacklist_test_allowed (&address->peer,
1913 address->transport_name,
1914 &plugin_env_session_start_bl_check_cont,
1915 NULL,
1916 address,
1917 session);
1918}
1919
1920
1921/**
1922 * Function called by ATS to notify the callee that the
1923 * assigned bandwidth or address for a given peer was changed. If the
1924 * callback is called with address/bandwidth assignments of zero, the
1925 * ATS disconnect function will still be called once the disconnect
1926 * actually happened.
1927 *
1928 * @param cls closure
1929 * @param peer the peer this address is intended for
1930 * @param address address to use (for peer given in address)
1931 * @param session session to use (if available)
1932 * @param bandwidth_out assigned outbound bandwidth for the connection in NBO,
1933 * 0 to disconnect from peer
1934 * @param bandwidth_in assigned inbound bandwidth for the connection in NBO,
1935 * 0 to disconnect from peer
1936 * @param ats ATS information
1937 * @param ats_count number of @a ats elements
1938 */
1939static void
1940ats_request_address_change (void *cls,
1941 const struct GNUNET_PeerIdentity *peer,
1942 const struct GNUNET_HELLO_Address *address,
1943 struct GNUNET_ATS_Session *session,
1944 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1945 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in)
1946{
1947 uint32_t bw_in = ntohl (bandwidth_in.value__);
1948 uint32_t bw_out = ntohl (bandwidth_out.value__);
1949
1950 if (NULL == peer)
1951 {
1952 /* ATS service died, all suggestions become invalid!
1953 (but we'll keep using the allocations for a little
1954 while, to keep going while ATS restarts) */
1955 /* FIXME: We should drop all
1956 connections now, as ATS won't explicitly tell
1957 us and be unaware of ongoing resource allocations! */
1958 return;
1959 }
1960 /* ATS tells me to disconnect from peer */
1961 if ((0 == bw_in) && (0 == bw_out))
1962 {
1963 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1964 "ATS tells me to disconnect from peer `%s'\n",
1965 GNUNET_i2s (peer));
1966 GST_neighbours_force_disconnect (peer);
1967 return;
1968 }
1969 GNUNET_assert (NULL != address);
1970 GNUNET_STATISTICS_update (GST_stats,
1971 "# ATS suggestions received",
1972 1,
1973 GNUNET_NO);
1974 GST_neighbours_switch_to_address (address,
1975 session,
1976 bandwidth_in,
1977 bandwidth_out);
1978}
1979
1980
1981/**
1982 * Closure for #test_connection_ok().
1983 */
1984struct TestConnectionContext
1985{
1986 /**
1987 * Is this the first neighbour we're checking?
1988 */
1989 int first;
1990
1991 /**
1992 * Handle to the blacklisting client we need to ask.
1993 */
1994 struct TransportClient *tc;
1995};
1996
1997
1998/**
1999 * Got the result about an existing connection from a new blacklister.
2000 * Shutdown the neighbour if necessary.
2001 *
2002 * @param cls unused
2003 * @param peer the neighbour that was investigated
2004 * @param address address associated with the request
2005 * @param session session associated with the request
2006 * @param allowed #GNUNET_OK if we can keep it,
2007 * #GNUNET_NO if we must shutdown the connection
2008 */
2009static void
2010confirm_or_drop_neighbour (void *cls,
2011 const struct GNUNET_PeerIdentity *peer,
2012 const struct GNUNET_HELLO_Address *address,
2013 struct GNUNET_ATS_Session *session,
2014 int allowed)
2015{
2016 if (GNUNET_OK == allowed)
2017 return; /* we're done */
2018 GNUNET_STATISTICS_update (GST_stats,
2019 gettext_noop ("# disconnects due to blacklist"),
2020 1,
2021 GNUNET_NO);
2022 GST_neighbours_force_disconnect (peer);
2023}
2024
2025
2026/**
2027 * Test if an existing connection is still acceptable given a new
2028 * blacklisting client.
2029 *
2030 * @param cls the `struct TestConnectionContext *`
2031 * @param peer identity of the peer
2032 * @param address the address
2033 * @param state current state this peer is in
2034 * @param state_timeout timeout for the current state of the peer
2035 * @param bandwidth_in bandwidth assigned inbound
2036 * @param bandwidth_out bandwidth assigned outbound
2037 */
2038static void
2039test_connection_ok (void *cls,
2040 const struct GNUNET_PeerIdentity *peer,
2041 const struct GNUNET_HELLO_Address *address,
2042 enum GNUNET_TRANSPORT_PeerState state,
2043 struct GNUNET_TIME_Absolute state_timeout,
2044 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
2045 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out)
2046{
2047 struct TestConnectionContext *tcc = cls;
2048 struct GST_BlacklistCheck *bc;
2049
2050 bc = GNUNET_new (struct GST_BlacklistCheck);
2051 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2052 bc->peer = *peer;
2053 bc->address = GNUNET_HELLO_address_copy (address);
2054 bc->cont = &confirm_or_drop_neighbour;
2055 bc->cont_cls = NULL;
2056 bc->bl_pos = tcc->tc;
2057 if (GNUNET_YES == tcc->first)
2058 {
2059 /* all would wait for the same client, no need to
2060 * create more than just the first task right now */
2061 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
2062 tcc->first = GNUNET_NO;
2063 }
2064}
2065
2066
2067/**
2068 * Initialize a blacklisting client. We got a blacklist-init
2069 * message from this client, add it to the list of clients
2070 * to query for blacklisting.
2071 *
2072 * @param cls the client
2073 * @param message the blacklist-init message that was sent
2074 */
2075static void
2076handle_client_blacklist_init (void *cls,
2077 const struct GNUNET_MessageHeader *message)
2078{
2079 struct TransportClient *tc = cls;
2080 struct TestConnectionContext tcc;
2081
2082 if (CT_NONE != tc->type)
2083 {
2084 GNUNET_break (0);
2085 GNUNET_SERVICE_client_drop (tc->client);
2086 return;
2087 }
2088 GNUNET_SERVICE_client_mark_monitor (tc->client);
2089 tc->type = CT_BLACKLIST;
2090 tc->details.blacklist.call_receive_done = GNUNET_YES;
2091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "New blacklist client %p\n", tc);
2092 /* confirm that all existing connections are OK! */
2093 tcc.tc = tc;
2094 tcc.first = GNUNET_YES;
2095 GST_neighbours_iterate (&test_connection_ok, &tcc);
2096}
2097
2098
2099/**
2100 * Free the given entry in the blacklist.
2101 *
2102 * @param cls unused
2103 * @param key host identity (unused)
2104 * @param value the blacklist entry
2105 * @return #GNUNET_OK (continue to iterate)
2106 */
2107static int
2108free_blacklist_entry (void *cls,
2109 const struct GNUNET_PeerIdentity *key,
2110 void *value)
2111{
2112 char *be = value;
2113
2114 GNUNET_free (be);
2115 return GNUNET_OK;
2116}
2117
2118
2119/**
2120 * Set traffic metric to manipulate
2121 *
2122 * @param cls closure
2123 * @param tm message containing information
2124 */
2125static void
2126handle_client_set_metric (void *cls, const struct TrafficMetricMessage *tm)
2127{
2128 struct TransportClient *tc = cls;
2129
2130 GST_manipulation_set_metric (tm);
2131 GNUNET_SERVICE_client_continue (tc->client);
2132}
2133
2134
2135/**
2136 * Function called when the service shuts down. Unloads our plugins
2137 * and cancels pending validations.
2138 *
2139 * @param cls closure, unused
2140 */
2141static void
2142shutdown_task (void *cls)
2143{
2144 struct AddressToStringContext *cur;
2145
2146 GST_neighbours_stop ();
2147 GST_plugins_unload ();
2148 GST_validation_stop ();
2149 GST_ats_done ();
2150 GNUNET_ATS_scheduling_done (GST_ats);
2151 GST_ats = NULL;
2152 GNUNET_ATS_connectivity_done (GST_ats_connect);
2153 GST_ats_connect = NULL;
2154 GNUNET_NT_scanner_done (GST_is);
2155 GST_is = NULL;
2156 while (NULL != (cur = a2s_head))
2157 {
2158 GNUNET_CONTAINER_DLL_remove (a2s_head, a2s_tail, cur);
2159 GNUNET_free (cur);
2160 }
2161 if (NULL != plugin_nc)
2162 {
2163 GNUNET_notification_context_destroy (plugin_nc);
2164 plugin_nc = NULL;
2165 }
2166 GNUNET_CONTAINER_multipeermap_destroy (active_stccs);
2167 active_stccs = NULL;
2168 if (NULL != blacklist)
2169 {
2170 GNUNET_CONTAINER_multipeermap_iterate (blacklist,
2171 &free_blacklist_entry,
2172 NULL);
2173 GNUNET_CONTAINER_multipeermap_destroy (blacklist);
2174 blacklist = NULL;
2175 }
2176 GST_hello_stop ();
2177 GST_manipulation_stop ();
2178
2179 if (NULL != GST_peerinfo)
2180 {
2181 GNUNET_PEERINFO_disconnect (GST_peerinfo);
2182 GST_peerinfo = NULL;
2183 }
2184 if (NULL != GST_stats)
2185 {
2186 GNUNET_STATISTICS_destroy (GST_stats, GNUNET_NO);
2187 GST_stats = NULL;
2188 }
2189}
2190
2191
2192static void
2193do_blacklist_check (void *cls)
2194{
2195 struct GST_BlacklistCheck *bc = cls;
2196 struct TransportClient *tc;
2197 struct GNUNET_MQ_Envelope *env;
2198 struct BlacklistMessage *bm;
2199
2200 bc->task = NULL;
2201 while (NULL != (tc = bc->bl_pos))
2202 {
2203 if (CT_BLACKLIST == tc->type)
2204 break;
2205 bc->bl_pos = tc->next;
2206 }
2207 if (NULL == tc)
2208 {
2209 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2210 "No other blacklist clients active, will allow neighbour `%s'\n",
2211 GNUNET_i2s (&bc->peer));
2212
2213 bc->cont (bc->cont_cls, &bc->peer, bc->address, bc->session, GNUNET_OK);
2214 GST_blacklist_test_cancel (bc);
2215 return;
2216 }
2217 if ((NULL != tc->details.blacklist.bc) ||
2218 (GNUNET_NO != tc->details.blacklist.waiting_for_reply))
2219 return; /* someone else busy with this client */
2220 tc->details.blacklist.bc = bc;
2221 env = GNUNET_MQ_msg (bm, GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_QUERY);
2222 bm->is_allowed = htonl (0);
2223 bm->peer = bc->peer;
2224 GNUNET_MQ_send (tc->mq, env);
2225 if (GNUNET_YES == tc->details.blacklist.call_receive_done)
2226 {
2227 tc->details.blacklist.call_receive_done = GNUNET_NO;
2228 GNUNET_SERVICE_client_continue (tc->client);
2229 }
2230 tc->details.blacklist.waiting_for_reply = GNUNET_YES;
2231}
2232
2233
2234/**
2235 * A blacklisting client has sent us reply. Process it.
2236 *
2237 * @param cls the client
2238 * @param msg the blacklist-reply message that was sent
2239 */
2240static void
2241handle_client_blacklist_reply (void *cls, const struct BlacklistMessage *msg)
2242{
2243 struct TransportClient *tc = cls;
2244 struct GST_BlacklistCheck *bc;
2245
2246 if (CT_BLACKLIST != tc->type)
2247 {
2248 GNUNET_break (0);
2249 GNUNET_SERVICE_client_drop (tc->client);
2250 return;
2251 }
2252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2253 "Blacklist client %p sent reply for `%s'\n",
2254 tc,
2255 GNUNET_i2s (&msg->peer));
2256 bc = tc->details.blacklist.bc;
2257 tc->details.blacklist.bc = NULL;
2258 tc->details.blacklist.waiting_for_reply = GNUNET_NO;
2259 tc->details.blacklist.call_receive_done = GNUNET_YES;
2260 if (NULL != bc)
2261 {
2262 /* only run this if the blacklist check has not been
2263 * cancelled in the meantime... */
2264 GNUNET_assert (bc->bl_pos == tc);
2265 if (ntohl (msg->is_allowed) == GNUNET_SYSERR)
2266 {
2267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2268 "Blacklist check failed, peer not allowed\n");
2269 /* For the duration of the continuation, make the ongoing
2270 check invisible (to avoid double-cancellation); then
2271 add it back again so we can re-use GST_blacklist_test_cancel() */
2272 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
2273 bc->cont (bc->cont_cls, &bc->peer, bc->address, bc->session, GNUNET_NO);
2274 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2275 GST_blacklist_test_cancel (bc);
2276 tc->details.blacklist.call_receive_done = GNUNET_NO;
2277 GNUNET_SERVICE_client_continue (tc->client);
2278 return;
2279 }
2280 else
2281 {
2282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2283 "Blacklist check succeeded, continuing with checks\n");
2284 tc->details.blacklist.call_receive_done = GNUNET_NO;
2285 GNUNET_SERVICE_client_continue (tc->client);
2286 bc->bl_pos = tc->next;
2287 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
2288 }
2289 }
2290 /* check if any other blacklist checks are waiting for this blacklister */
2291 for (bc = bc_head; bc != NULL; bc = bc->next)
2292 if ((bc->bl_pos == tc) && (NULL == bc->task))
2293 {
2294 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
2295 break;
2296 }
2297}
2298
2299
2300/**
2301 * Add the given peer to the blacklist (for the given transport).
2302 *
2303 * @param peer peer to blacklist
2304 * @param transport_name transport to blacklist for this peer, NULL for all
2305 */
2306void
2307GST_blacklist_add_peer (const struct GNUNET_PeerIdentity *peer,
2308 const char *transport_name)
2309{
2310 char *transport = NULL;
2311
2312 if (NULL != transport_name)
2313 {
2314 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2315 "Adding peer `%s' with plugin `%s' to blacklist\n",
2316 GNUNET_i2s (peer),
2317 transport_name);
2318 transport = GNUNET_strdup (transport_name);
2319 }
2320 else
2321 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2322 "Adding peer `%s' with all plugins to blacklist\n",
2323 GNUNET_i2s (peer));
2324 if (NULL == blacklist)
2325 blacklist =
2326 GNUNET_CONTAINER_multipeermap_create (TRANSPORT_BLACKLIST_HT_SIZE,
2327 GNUNET_NO);
2328
2329 GNUNET_CONTAINER_multipeermap_put (blacklist,
2330 peer,
2331 transport,
2332 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2333}
2334
2335
2336/**
2337 * Abort blacklist if @a address and @a session match.
2338 *
2339 * @param address address used to abort matching checks
2340 * @param session session used to abort matching checks
2341 */
2342void
2343GST_blacklist_abort_matching (const struct GNUNET_HELLO_Address *address,
2344 struct GNUNET_ATS_Session *session)
2345{
2346 struct GST_BlacklistCheck *bc;
2347 struct GST_BlacklistCheck *n;
2348
2349 n = bc_head;
2350 while (NULL != (bc = n))
2351 {
2352 n = bc->next;
2353 if ((bc->session == session) &&
2354 (0 == GNUNET_HELLO_address_cmp (bc->address, address)))
2355 {
2356 bc->cont (bc->cont_cls,
2357 &bc->peer,
2358 bc->address,
2359 bc->session,
2360 GNUNET_SYSERR);
2361 GST_blacklist_test_cancel (bc);
2362 }
2363 }
2364}
2365
2366
2367/**
2368 * Test if the given blacklist entry matches. If so,
2369 * abort the iteration.
2370 *
2371 * @param cls the transport name to match (const char*)
2372 * @param key the key (unused)
2373 * @param value the 'char *' (name of a blacklisted transport)
2374 * @return #GNUNET_OK if the entry does not match, #GNUNET_NO if it matches
2375 */
2376static int
2377test_blacklisted (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
2378{
2379 const char *transport_name = cls;
2380 char *be = value;
2381
2382 /* Blacklist entry be:
2383 * (NULL == be): peer is blacklisted with all plugins
2384 * (NULL != be): peer is blacklisted for a specific plugin
2385 *
2386 * If (NULL != transport_name) we look for a transport specific entry:
2387 * if (transport_name == be) forbidden
2388 *
2389 */GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2390 "Comparing BL request for peer `%4s':`%s' with BL entry: `%s'\n",
2391 GNUNET_i2s (key),
2392 (NULL == transport_name) ? "unspecified" : transport_name,
2393 (NULL == be) ? "all plugins" : be);
2394 /* all plugins for this peer were blacklisted: disallow */
2395 if (NULL == value)
2396 return GNUNET_NO;
2397
2398 /* blacklist check for specific transport */
2399 if ((NULL != transport_name) && (NULL != value))
2400 {
2401 if (0 == strcmp (transport_name, be))
2402 return GNUNET_NO; /* plugin is blacklisted! */
2403 }
2404 return GNUNET_OK;
2405}
2406
2407
2408/**
2409 * Test if a peer/transport combination is blacklisted.
2410 *
2411 * @param peer the identity of the peer to test
2412 * @param transport_name name of the transport to test, never NULL
2413 * @param cont function to call with result
2414 * @param cont_cls closure for @a cont
2415 * @param address address to pass back to @a cont, can be NULL
2416 * @param session session to pass back to @a cont, can be NULL
2417 * @return handle to the blacklist check, NULL if the decision
2418 * was made instantly and @a cont was already called
2419 */
2420struct GST_BlacklistCheck *
2421GST_blacklist_test_allowed (const struct GNUNET_PeerIdentity *peer,
2422 const char *transport_name,
2423 GST_BlacklistTestContinuation cont,
2424 void *cont_cls,
2425 const struct GNUNET_HELLO_Address *address,
2426 struct GNUNET_ATS_Session *session)
2427{
2428 struct GST_BlacklistCheck *bc;
2429 struct TransportClient *tc;
2430
2431 GNUNET_assert (NULL != peer);
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2433 "Blacklist check for peer `%s':%s\n",
2434 GNUNET_i2s (peer),
2435 (NULL != transport_name) ? transport_name : "unspecified");
2436
2437 /* Check local blacklist by iterating over hashmap
2438 * If iteration is aborted, we found a matching blacklist entry */
2439 if ((NULL != blacklist) &&
2440 (GNUNET_SYSERR ==
2441 GNUNET_CONTAINER_multipeermap_get_multiple (blacklist,
2442 peer,
2443 &test_blacklisted,
2444 (void *) transport_name)))
2445 {
2446 /* Disallowed by config, disapprove instantly */
2447 GNUNET_STATISTICS_update (GST_stats,
2448 gettext_noop ("# disconnects due to blacklist"),
2449 1,
2450 GNUNET_NO);
2451 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2452 _ ("Disallowing connection to peer `%s' on transport %s\n"),
2453 GNUNET_i2s (peer),
2454 (NULL != transport_name) ? transport_name : "unspecified");
2455 if (NULL != cont)
2456 cont (cont_cls, peer, address, session, GNUNET_NO);
2457 return NULL;
2458 }
2459
2460 for (tc = clients_head; NULL != tc; tc = tc->next)
2461 if (CT_BLACKLIST == tc->type)
2462 break;
2463 if (NULL == tc)
2464 {
2465 /* no blacklist clients, approve instantly */
2466 if (NULL != cont)
2467 cont (cont_cls, peer, address, session, GNUNET_OK);
2468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2469 "Allowing connection to peer `%s' %s\n",
2470 GNUNET_i2s (peer),
2471 (NULL != transport_name) ? transport_name : "");
2472 return NULL;
2473 }
2474
2475 /* need to query blacklist clients */
2476 bc = GNUNET_new (struct GST_BlacklistCheck);
2477 GNUNET_CONTAINER_DLL_insert (bc_head, bc_tail, bc);
2478 bc->peer = *peer;
2479 bc->address = GNUNET_HELLO_address_copy (address);
2480 bc->session = session;
2481 bc->cont = cont;
2482 bc->cont_cls = cont_cls;
2483 bc->bl_pos = tc;
2484 bc->task = GNUNET_SCHEDULER_add_now (&do_blacklist_check, bc);
2485 return bc;
2486}
2487
2488
2489void
2490GST_blacklist_test_cancel (struct GST_BlacklistCheck *bc)
2491{
2492 GNUNET_CONTAINER_DLL_remove (bc_head, bc_tail, bc);
2493 if (NULL != bc->bl_pos)
2494 {
2495 if ((CT_BLACKLIST == bc->bl_pos->type) &&
2496 (bc->bl_pos->details.blacklist.bc == bc))
2497 {
2498 /* we're at the head of the queue, remove us! */
2499 bc->bl_pos->details.blacklist.bc = NULL;
2500 }
2501 }
2502 if (NULL != bc->task)
2503 {
2504 GNUNET_SCHEDULER_cancel (bc->task);
2505 bc->task = NULL;
2506 }
2507 GNUNET_free (bc->address);
2508 GNUNET_free (bc);
2509}
2510
2511
2512/**
2513 * Function to iterate over options in the blacklisting section for a peer.
2514 *
2515 * @param cls closure
2516 * @param section name of the section
2517 * @param option name of the option
2518 * @param value value of the option
2519 */
2520static void
2521blacklist_cfg_iter (void *cls,
2522 const char *section,
2523 const char *option,
2524 const char *value)
2525{
2526 unsigned int *res = cls;
2527 struct GNUNET_PeerIdentity peer;
2528 char *plugs;
2529 char *pos;
2530
2531 if (GNUNET_OK !=
2532 GNUNET_CRYPTO_eddsa_public_key_from_string (option,
2533 strlen (option),
2534 &peer.public_key))
2535 return;
2536
2537 if ((NULL == value) || (0 == strcmp (value, "")))
2538 {
2539 /* Blacklist whole peer */
2540 GST_blacklist_add_peer (&peer, NULL);
2541 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2542 _ ("Adding blacklisting entry for peer `%s'\n"),
2543 GNUNET_i2s (&peer));
2544 }
2545 else
2546 {
2547 plugs = GNUNET_strdup (value);
2548 for (pos = strtok (plugs, " "); pos != NULL; pos = strtok (NULL, " "))
2549 {
2550 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2551 _ ("Adding blacklisting entry for peer `%s':`%s'\n"),
2552 GNUNET_i2s (&peer),
2553 pos);
2554 GST_blacklist_add_peer (&peer, pos);
2555 }
2556 GNUNET_free (plugs);
2557 }
2558 (*res)++;
2559}
2560
2561
2562/**
2563 * Read blacklist configuration
2564 *
2565 * @param cfg the configuration handle
2566 * @param my_id my peer identity
2567 */
2568static void
2569read_blacklist_configuration (const struct GNUNET_CONFIGURATION_Handle *cfg,
2570 const struct GNUNET_PeerIdentity *my_id)
2571{
2572 char cfg_sect[512];
2573 unsigned int res = 0;
2574
2575 GNUNET_snprintf (cfg_sect,
2576 sizeof(cfg_sect),
2577 "transport-blacklist-%s",
2578 GNUNET_i2s_full (my_id));
2579 GNUNET_CONFIGURATION_iterate_section_values (cfg,
2580 cfg_sect,
2581 &blacklist_cfg_iter,
2582 &res);
2583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2584 "Loaded %u blacklisting entries from configuration\n",
2585 res);
2586}
2587
2588
2589/**
2590 * Initiate transport service.
2591 *
2592 * @param cls closure
2593 * @param c configuration to use
2594 * @param service the initialized service
2595 */
2596static void
2597run (void *cls,
2598 const struct GNUNET_CONFIGURATION_Handle *c,
2599 struct GNUNET_SERVICE_Handle *service)
2600{
2601 char *keyfile;
2602 long long unsigned int max_fd_cfg;
2603 int max_fd_rlimit;
2604 int max_fd;
2605 int friend_only;
2606
2607 /* setup globals */
2608 GST_cfg = c;
2609 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (c,
2610 "PEER",
2611 "PRIVATE_KEY",
2612 &keyfile))
2613 {
2614 GNUNET_log (
2615 GNUNET_ERROR_TYPE_ERROR,
2616 _ (
2617 "Transport service is lacking key configuration settings. Exiting.\n"));
2618 GNUNET_SCHEDULER_shutdown ();
2619 return;
2620 }
2621 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (c,
2622 "transport",
2623 "HELLO_EXPIRATION",
2624 &hello_expiration))
2625 {
2626 hello_expiration = GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION;
2627 }
2628 if (GNUNET_SYSERR ==
2629 GNUNET_CRYPTO_eddsa_key_from_file (keyfile,
2630 GNUNET_YES,
2631 &GST_my_private_key))
2632 {
2633 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2634 "Failed to setup peer's private key\n");
2635 GNUNET_SCHEDULER_shutdown ();
2636 GNUNET_free (keyfile);
2637 return;
2638 }
2639 GNUNET_free (keyfile);
2640 GST_stats = GNUNET_STATISTICS_create ("transport", GST_cfg);
2641 GST_peerinfo = GNUNET_PEERINFO_connect (GST_cfg);
2642 GNUNET_CRYPTO_eddsa_key_get_public (&GST_my_private_key,
2643 &GST_my_identity.public_key);
2644 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2645 "My identity is `%s'\n",
2646 GNUNET_i2s_full (&GST_my_identity));
2647
2648 GNUNET_SCHEDULER_add_shutdown (&shutdown_task, NULL);
2649 if (NULL == GST_peerinfo)
2650 {
2651 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
2652 _ ("Could not access PEERINFO service. Exiting.\n"));
2653 GNUNET_SCHEDULER_shutdown ();
2654 return;
2655 }
2656
2657 max_fd_rlimit = 0;
2658#if HAVE_GETRLIMIT
2659 {
2660 struct rlimit r_file;
2661
2662 if (0 == getrlimit (RLIMIT_NOFILE, &r_file))
2663 {
2664 max_fd_rlimit = r_file.rlim_cur;
2665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2666 "Maximum number of open files was: %u/%u\n",
2667 (unsigned int) r_file.rlim_cur,
2668 (unsigned int) r_file.rlim_max);
2669 }
2670 max_fd_rlimit =
2671 (9 * max_fd_rlimit) / 10; /* Keep 10% for rest of transport */
2672 }
2673#endif
2674 if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (GST_cfg,
2675 "transport",
2676 "MAX_FD",
2677 &max_fd_cfg))
2678 max_fd_cfg = max_fd_rlimit;
2679
2680 if (max_fd_cfg > max_fd_rlimit)
2681 max_fd = max_fd_cfg;
2682 else
2683 max_fd = max_fd_rlimit;
2684 if (max_fd < DEFAULT_MAX_FDS)
2685 max_fd = DEFAULT_MAX_FDS;
2686
2687 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2688 "Limiting number of sockets to %u: validation %u, neighbors: %u\n",
2689 max_fd,
2690 (max_fd / 3),
2691 (max_fd / 3) * 2);
2692
2693 friend_only =
2694 GNUNET_CONFIGURATION_get_value_yesno (GST_cfg, "topology", "FRIENDS-ONLY");
2695 if (GNUNET_SYSERR == friend_only)
2696 friend_only = GNUNET_NO; /* According to topology defaults */
2697 /* start subsystems */
2698 /* Disable DSTJ peer */
2699 {
2700 struct GNUNET_PeerIdentity dstj;
2701 const char *ds = "DSTJBRRKZ8TBW3FGK6B0M5QXWT9WYNZ45H5MCV4HY7ST64Q8T9F0";
2702
2703 GNUNET_assert (
2704 GNUNET_OK ==
2705 GNUNET_CRYPTO_eddsa_public_key_from_string (ds,
2706 strlen (ds),
2707 &dstj.public_key));
2708 GST_blacklist_add_peer (&dstj, NULL);
2709 }
2710 read_blacklist_configuration (GST_cfg, &GST_my_identity);
2711 GST_is = GNUNET_NT_scanner_init ();
2712 GST_ats_connect = GNUNET_ATS_connectivity_init (GST_cfg);
2713 GST_ats =
2714 GNUNET_ATS_scheduling_init (GST_cfg, &ats_request_address_change, NULL);
2715 GST_ats_init ();
2716 GST_manipulation_init ();
2717 GST_plugins_load (&GST_manipulation_recv,
2718 &plugin_env_address_change_notification,
2719 &plugin_env_session_start,
2720 &plugin_env_session_end);
2721 GST_hello_start (friend_only, &process_hello_update, NULL);
2722 GST_neighbours_start ((max_fd / 3) * 2);
2723 active_stccs = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
2724 plugin_nc = GNUNET_notification_context_create (0);
2725 GST_validation_start ((max_fd / 3));
2726}
2727
2728
2729/**
2730 * Define "main" method using service macro.
2731 */
2732GNUNET_SERVICE_MAIN (
2733 "transport",
2734 GNUNET_SERVICE_OPTION_NONE,
2735 &run,
2736 &client_connect_cb,
2737 &client_disconnect_cb,
2738 NULL,
2739 GNUNET_MQ_hd_fixed_size (client_start,
2740 GNUNET_MESSAGE_TYPE_TRANSPORT_START,
2741 struct StartMessage,
2742 NULL),
2743 GNUNET_MQ_hd_var_size (client_hello,
2744 GNUNET_MESSAGE_TYPE_HELLO,
2745 struct GNUNET_MessageHeader,
2746 NULL),
2747 GNUNET_MQ_hd_var_size (client_send,
2748 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND,
2749 struct OutboundMessage,
2750 NULL),
2751 GNUNET_MQ_hd_var_size (client_address_to_string,
2752 GNUNET_MESSAGE_TYPE_TRANSPORT_ADDRESS_TO_STRING,
2753 struct AddressLookupMessage,
2754 NULL),
2755 GNUNET_MQ_hd_fixed_size (client_monitor_peers,
2756 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PEER_REQUEST,
2757 struct PeerMonitorMessage,
2758 NULL),
2759 GNUNET_MQ_hd_fixed_size (client_blacklist_init,
2760 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_INIT,
2761 struct GNUNET_MessageHeader,
2762 NULL),
2763 GNUNET_MQ_hd_fixed_size (client_blacklist_reply,
2764 GNUNET_MESSAGE_TYPE_TRANSPORT_BLACKLIST_REPLY,
2765 struct BlacklistMessage,
2766 NULL),
2767 GNUNET_MQ_hd_fixed_size (client_set_metric,
2768 GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC,
2769 struct TrafficMetricMessage,
2770 NULL),
2771 GNUNET_MQ_hd_fixed_size (client_monitor_plugins,
2772 GNUNET_MESSAGE_TYPE_TRANSPORT_MONITOR_PLUGIN_START,
2773 struct GNUNET_MessageHeader,
2774 NULL),
2775 GNUNET_MQ_handler_end ());
2776
2777
2778/* end of file gnunet-service-transport.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-30 17:28:51 +0000