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-rw-r--r--src/mesh/gnunet-service-mesh.c5875
1 files changed, 44 insertions, 5831 deletions
diff --git a/src/mesh/gnunet-service-mesh.c b/src/mesh/gnunet-service-mesh.c
index d63576b4b..d187c93af 100644
--- a/src/mesh/gnunet-service-mesh.c
+++ b/src/mesh/gnunet-service-mesh.c
@@ -20,5696 +20,74 @@
20 20
21/** 21/**
22 * @file mesh/gnunet-service-mesh.c 22 * @file mesh/gnunet-service-mesh.c
23 * @brief GNUnet MESH service 23 * @brief GNUnet MESH service with encryption
24 * @author Bartlomiej Polot 24 * @author Bartlomiej Polot
25 * 25 *
26 * FIXME in progress: 26 * FIXME in progress:
27 * - when sending in-order buffered data, wait for client ACKs 27 * - rekey - reliability interaction
28 * - channel retransmit timing
28 * 29 *
29 * TODO: 30 * TODO:
30 * - relay corking down to core 31 * - relay corking down to core
31 * - set ttl relative to path length 32 * - set ttl relative to path length
32 * - add signatures
33 * - add encryption
34 * TODO END 33 * TODO END
34 *
35 * Dictionary:
36 * - peer: other mesh 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.
35 */ 42 */
36 43
37#include "platform.h" 44#include "platform.h"
45#include "gnunet_util_lib.h"
38#include "mesh.h" 46#include "mesh.h"
39#include "mesh_protocol.h"
40#include "mesh_path.h"
41#include "block_mesh.h"
42#include "gnunet_dht_service.h"
43#include "gnunet_statistics_service.h" 47#include "gnunet_statistics_service.h"
44 48
45#define MESH_BLOOM_SIZE 128 49#include "gnunet-service-mesh_local.h"
46 50#include "gnunet-service-mesh_channel.h"
47#define MESH_DEBUG_DHT GNUNET_NO 51#include "gnunet-service-mesh_connection.h"
48#define MESH_DEBUG_CONNECTION GNUNET_NO 52#include "gnunet-service-mesh_tunnel.h"
49#define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO 53#include "gnunet-service-mesh_dht.h"
50 54#include "gnunet-service-mesh_peer.h"
51#define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\
52 GNUNET_TIME_UNIT_MINUTES,\
53 10)
54#define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS
55#define MESH_RETRANSMIT_MARGIN 4
56
57#if MESH_DEBUG_CONNECTION
58#define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
59#else
60#define DEBUG_CONN(...)
61#endif
62
63#if MESH_DEBUG_DHT
64#define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__)
65#else
66#define DEBUG_DHT(...)
67#endif
68
69#if MESH_DEBUG_TIMING
70#include <time.h>
71double __sum;
72uint64_t __count;
73struct timespec __mesh_start;
74struct timespec __mesh_end;
75#define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start))
76#define INTERVAL_END \
77do {\
78 clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\
79 double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\
80 if (__diff < 0) __diff += 1000000000;\
81 __sum += __diff;\
82 __count++;\
83} while (0)
84#define INTERVAL_SHOW \
85if (0 < __count)\
86 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count)
87#else
88#define INTERVAL_START
89#define INTERVAL_END
90#define INTERVAL_SHOW
91#endif
92
93/******************************************************************************/
94/************************ DATA STRUCTURES ****************************/
95/******************************************************************************/
96
97/** FWD declaration */
98struct MeshPeer;
99struct MeshClient;
100
101
102/**
103 * Struct containing info about a queued transmission to this peer
104 */
105struct MeshPeerQueue
106{
107 /**
108 * DLL next
109 */
110 struct MeshPeerQueue *next;
111
112 /**
113 * DLL previous
114 */
115 struct MeshPeerQueue *prev;
116
117 /**
118 * Peer this transmission is directed to.
119 */
120 struct MeshPeer *peer;
121
122 /**
123 * Tunnel this message belongs to.
124 */
125 struct MeshTunnel *tunnel;
126
127 /**
128 * Pointer to info stucture used as cls.
129 */
130 void *cls;
131
132 /**
133 * Type of message
134 */
135 uint16_t type;
136
137 /**
138 * Size of the message
139 */
140 size_t size;
141};
142
143
144/**
145 * Struct containing all information regarding a given peer
146 */
147struct MeshPeer
148{
149 /**
150 * ID of the peer
151 */
152 GNUNET_PEER_Id id;
153
154 /**
155 * Last time we heard from this peer
156 */
157 struct GNUNET_TIME_Absolute last_contact;
158
159 /**
160 * Number of attempts to reconnect so far
161 */
162 int n_reconnect_attempts;
163
164 /**
165 * Paths to reach the peer, ordered by ascending hop count
166 */
167 struct MeshPeerPath *path_head;
168
169 /**
170 * Paths to reach the peer, ordered by ascending hop count
171 */
172 struct MeshPeerPath *path_tail;
173
174 /**
175 * Handle to stop the DHT search for a path to this peer
176 */
177 struct GNUNET_DHT_GetHandle *dhtget;
178
179 /**
180 * Array of tunnels this peer is the target of.
181 * Most probably a small amount, therefore not a hashmap.
182 * When the path to the peer changes, notify these tunnels to let them
183 * re-adjust their path trees.
184 */
185 struct MeshTunnel **tunnels;
186
187 /**
188 * Number of tunnels this peers participates in
189 */
190 unsigned int ntunnels;
191
192 /**
193 * Transmission queue to core DLL head
194 */
195 struct MeshPeerQueue *queue_head;
196
197 /**
198 * Transmission queue to core DLL tail
199 */
200 struct MeshPeerQueue *queue_tail;
201
202 /**
203 * How many messages are in the queue to this peer.
204 */
205 unsigned int queue_n;
206
207 /**
208 * Handle for queued transmissions
209 */
210 struct GNUNET_CORE_TransmitHandle *core_transmit;
211};
212
213
214/**
215 * Struct to encapsulate all the Flow Control information to a peer in the
216 * context of a tunnel: Same peer in different tunnels will have independent
217 * flow control structures, allowing to choke/free tunnels according to its
218 * own criteria.
219 */
220struct MeshFlowControl
221{
222 /**
223 * ID of the last packet sent towards the peer.
224 */
225 uint32_t last_pid_sent;
226
227 /**
228 * ID of the last packet received from the peer.
229 */
230 uint32_t last_pid_recv;
231
232 /**
233 * Last ACK sent to the peer (peer can't send more than this PID).
234 */
235 uint32_t last_ack_sent;
236
237 /**
238 * Last ACK sent towards the origin (for traffic towards leaf node).
239 */
240 uint32_t last_ack_recv;
241
242 /**
243 * How many payload messages are in the queue towards this peer.
244 */
245 uint32_t queue_n;
246
247 /**
248 * Task to poll the peer in case of a lost ACK causes stall.
249 */
250 GNUNET_SCHEDULER_TaskIdentifier poll_task;
251
252 /**
253 * How frequently to poll for ACKs.
254 */
255 struct GNUNET_TIME_Relative poll_time;
256
257 /**
258 * On which tunnel to poll.
259 * Using an explicit poll_ctx would not help memory wise,
260 * since the allocated context would have to be stored in the
261 * fc struct in order to free it upon cancelling poll_task.
262 */
263 struct MeshTunnel *t;
264};
265
266
267/**
268 * Globally unique tunnel identification (owner + number)
269 * DO NOT USE OVER THE NETWORK
270 */
271struct MESH_TunnelID
272{
273 /**
274 * Node that owns the tunnel
275 */
276 GNUNET_PEER_Id oid;
277
278 /**
279 * Tunnel number to differentiate all the tunnels owned by the node oid
280 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
281 */
282 MESH_TunnelNumber tid;
283};
284
285
286/**
287 * Data needed for reliable tunnel endpoint retransmission management.
288 */
289struct MeshTunnelReliability;
290
291
292/**
293 * Info needed to retry a message in case it gets lost.
294 */
295struct MeshReliableMessage
296{
297 /**
298 * Double linked list, FIFO style
299 */
300 struct MeshReliableMessage *next;
301 struct MeshReliableMessage *prev;
302
303 /**
304 * Tunnel Reliability queue this message is in.
305 */
306 struct MeshTunnelReliability *rel;
307
308 /**
309 * ID of the message (ACK needed to free)
310 */
311 uint32_t mid;
312
313 /**
314 * When was this message issued (to calculate ACK delay)
315 */
316 struct GNUNET_TIME_Absolute timestamp;
317
318 /* struct GNUNET_MESH_Data with payload */
319};
320
321
322struct MeshTunnelReliability
323{
324 /**
325 * Tunnel this is about.
326 */
327 struct MeshTunnel *t;
328
329 /**
330 * DLL of messages sent and not yet ACK'd.
331 */
332 struct MeshReliableMessage *head_sent;
333 struct MeshReliableMessage *tail_sent;
334
335 /**
336 * Messages pending
337 */
338 unsigned int n_sent;
339
340 /**
341 * Next MID to use.
342 */
343 uint32_t mid_sent;
344
345 /**
346 * DLL of messages received out of order.
347 */
348 struct MeshReliableMessage *head_recv;
349 struct MeshReliableMessage *tail_recv;
350
351 /**
352 * Next MID expected.
353 */
354 uint32_t mid_recv;
355
356 /**
357 * Task to resend/poll in case no ACK is received.
358 */
359 GNUNET_SCHEDULER_TaskIdentifier retry_task;
360
361 /**
362 * Counter for exponential backoff.
363 */
364 struct GNUNET_TIME_Relative retry_timer;
365
366 /**
367 * How long does it usually take to get an ACK.
368 */
369 struct GNUNET_TIME_Relative expected_delay;
370};
371
372
373/**
374 * Struct containing all information regarding a tunnel
375 * For an intermediate node the improtant info used will be:
376 * - id Tunnel unique identification
377 * - paths[0] To know where to send it next
378 * - metainfo: ready, speeds, accounting
379 */
380struct MeshTunnel
381{
382 /**
383 * Tunnel ID
384 */
385 struct MESH_TunnelID id;
386
387 /**
388 * Port of the tunnel.
389 */
390 uint32_t port;
391
392 /**
393 * State of the tunnel.
394 */
395 enum MeshTunnelState state;
396
397 /**
398 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
399 */
400 MESH_TunnelNumber local_tid;
401
402 /**
403 * Local tunnel number for local destination clients (incoming number)
404 * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same
405 * number.
406 */
407 MESH_TunnelNumber local_tid_dest;
408 55
409 /**
410 * Is the tunnel bufferless (minimum latency)?
411 */
412 int nobuffer;
413
414 /**
415 * Is the tunnel reliable?
416 */
417 int reliable;
418
419 /**
420 * Force sending ACK? Flag to allow duplicate ACK on POLL.
421 */
422 int force_ack;
423
424 /**
425 * How many messages do we accept in the forward queue.
426 */
427 unsigned int queue_max;
428
429 /**
430 * Last time the tunnel was used
431 */
432 struct GNUNET_TIME_Absolute timestamp;
433
434 /**
435 * Destination of the tunnel.
436 */
437 GNUNET_PEER_Id dest;
438
439 /**
440 * Next hop in the tunnel. If 0, @c client must be set.
441 */
442 GNUNET_PEER_Id next_hop;
443
444 /**
445 * Previous hop in the tunnel. If 0, @c owner must be set.
446 */
447 GNUNET_PEER_Id prev_hop;
448
449 /**
450 * Flow control information about @c next_hop or @c client.
451 */
452 struct MeshFlowControl next_fc;
453
454 /**
455 * Flow control information about @c prev_hop or @c owner.
456 */
457 struct MeshFlowControl prev_fc;
458
459 /**
460 * Client owner of the tunnel, if any
461 */
462 struct MeshClient *owner;
463
464 /**
465 * Client destination of the tunnel, if any.
466 */
467 struct MeshClient *client;
468
469 /**
470 * Task to keep the used paths alive at the owner,
471 * time tunnel out on all the other peers.
472 */
473 GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task;
474
475 /**
476 * Task to keep the used paths alive at the destination,
477 * time tunnel out on all the other peers.
478 */
479 GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task;
480
481 /**
482 * Path being used for the tunnel.
483 */
484 struct MeshPeerPath *path;
485
486 /**
487 * Flag to signal the destruction of the tunnel.
488 * If this is set GNUNET_YES the tunnel will be destroyed
489 * when the queue is empty.
490 */
491 int destroy;
492
493 /**
494 * Total messages pending for this tunnels, payload or not.
495 */
496 unsigned int pending_messages;
497
498 /**
499 * Reliability data.
500 * Only present (non-NULL) at the owner of a tunnel.
501 */
502 struct MeshTunnelReliability *fwd_rel;
503
504 /**
505 * Reliability data.
506 * Only present (non-NULL) at the destination of a tunnel.
507 */
508 struct MeshTunnelReliability *bck_rel;
509};
510
511
512/**
513 * Struct containing information about a client of the service
514 *
515 * TODO: add a list of 'waiting' ports
516 */
517struct MeshClient
518{
519 /**
520 * Linked list next
521 */
522 struct MeshClient *next;
523
524 /**
525 * Linked list prev
526 */
527 struct MeshClient *prev;
528
529 /**
530 * Tunnels that belong to this client, indexed by local id
531 */
532 struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels;
533
534 /**
535 * Tunnels this client has accepted, indexed by incoming local id
536 */
537 struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
538
539 /**
540 * Handle to communicate with the client
541 */
542 struct GNUNET_SERVER_Client *handle;
543
544 /**
545 * Ports that this client has declared interest in.
546 * Indexed by port, contains *Client.
547 */
548 struct GNUNET_CONTAINER_MultiHashMap32 *ports;
549
550 /**
551 * Whether the client is active or shutting down (don't send confirmations
552 * to a client that is shutting down.
553 */
554 int shutting_down;
555
556 /**
557 * ID of the client, mainly for debug messages
558 */
559 unsigned int id;
560
561};
562
563
564/******************************************************************************/
565/************************ DEBUG FUNCTIONS ****************************/
566/******************************************************************************/
567
568#if MESH_DEBUG
569/**
570 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
571 * @param cls string to print
572 * @param success GNUNET_OK if the PUT was transmitted,
573 * GNUNET_NO on timeout,
574 * GNUNET_SYSERR on disconnect from service
575 * after the PUT message was transmitted
576 * (so we don't know if it was received or not)
577 */
578
579#if 0
580static void
581mesh_debug (void *cls, int success)
582{
583 char *s = cls;
584
585 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success);
586}
587#endif
588
589#endif
590 56
591/******************************************************************************/ 57/******************************************************************************/
592/*********************** GLOBAL VARIABLES ****************************/ 58/*********************** GLOBAL VARIABLES ****************************/
593/******************************************************************************/ 59/******************************************************************************/
594 60
595/************************** Configuration parameters **************************/ 61/****************************** Global variables ******************************/
596
597/**
598 * How often to send tunnel keepalives. Tunnels timeout after 4 missed.
599 */
600static struct GNUNET_TIME_Relative refresh_path_time;
601
602/**
603 * How often to PUT own ID in the DHT.
604 */
605static struct GNUNET_TIME_Relative id_announce_time;
606
607/**
608 * Maximum time allowed to connect to a peer found by string.
609 */
610static struct GNUNET_TIME_Relative connect_timeout;
611
612/**
613 * Default TTL for payload packets.
614 */
615static unsigned long long default_ttl;
616
617/**
618 * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put.
619 */
620static unsigned long long dht_replication_level;
621
622/**
623 * How many tunnels are we willing to maintain.
624 * Local tunnels are always allowed, even if there are more tunnels than max.
625 */
626static unsigned long long max_tunnels;
627
628/**
629 * How many messages *in total* are we willing to queue, divided by number of
630 * tunnels to get tunnel queue size.
631 */
632static unsigned long long max_msgs_queue;
633
634/**
635 * How many peers do we want to remember?
636 */
637static unsigned long long max_peers;
638
639/**
640 * Percentage of messages that will be dropped (for test purposes only).
641 */
642static unsigned long long drop_percent;
643
644/*************************** Static global variables **************************/
645
646/**
647 * DLL with all the clients, head.
648 */
649static struct MeshClient *clients_head;
650
651/**
652 * DLL with all the clients, tail.
653 */
654static struct MeshClient *clients_tail;
655
656/**
657 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel).
658 */
659static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
660
661/**
662 * Number of tunnels known.
663 */
664static unsigned long long n_tunnels;
665
666/**
667 * Tunnels incoming, indexed by MESH_TunnelNumber
668 * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV).
669 */
670static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels;
671
672/**
673 * Peers known, indexed by PeerIdentity (MeshPeer).
674 */
675static struct GNUNET_CONTAINER_MultiPeerMap *peers;
676
677/*
678 * Handle to communicate with transport
679 */
680// static struct GNUNET_TRANSPORT_Handle *transport_handle;
681
682/**
683 * Handle to communicate with core.
684 */
685static struct GNUNET_CORE_Handle *core_handle;
686
687/**
688 * Handle to use DHT.
689 */
690static struct GNUNET_DHT_Handle *dht_handle;
691
692/**
693 * Handle to server.
694 */
695static struct GNUNET_SERVER_Handle *server_handle;
696 62
697/** 63/**
698 * Handle to the statistics service. 64 * Handle to the statistics service.
699 */ 65 */
700static struct GNUNET_STATISTICS_Handle *stats; 66struct GNUNET_STATISTICS_Handle *stats;
701
702/**
703 * Notification context, to send messages to local clients.
704 */
705static struct GNUNET_SERVER_NotificationContext *nc;
706 67
707/** 68/**
708 * Local peer own ID (memory efficient handle). 69 * Local peer own ID (memory efficient handle).
709 */ 70 */
710static GNUNET_PEER_Id myid; 71GNUNET_PEER_Id myid;
711 72
712/** 73/**
713 * Local peer own ID (full value). 74 * Local peer own ID (full value).
714 */ 75 */
715static struct GNUNET_PeerIdentity my_full_id; 76struct GNUNET_PeerIdentity my_full_id;
77
78/*************************** Static global variables **************************/
716 79
717/** 80/**
718 * Own private key. 81 * Own private key.
719 */ 82 */
720static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key; 83static struct GNUNET_CRYPTO_EddsaPrivateKey *my_private_key;
721 84
722/**
723 * Tunnel ID for the next created tunnel (global tunnel number).
724 */
725static MESH_TunnelNumber next_tid;
726
727/**
728 * Tunnel ID for the next incoming tunnel (local tunnel number).
729 */
730static MESH_TunnelNumber next_local_tid;
731
732/**
733 * All ports clients of this peer have opened.
734 */
735static struct GNUNET_CONTAINER_MultiHashMap32 *ports;
736
737/**
738 * Task to periodically announce itself in the network.
739 */
740GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
741
742/**
743 * Next ID to assign to a client.
744 */
745unsigned int next_client_id;
746
747
748/******************************************************************************/
749/*********************** DECLARATIONS **************************/
750/******************************************************************************/
751
752/**
753 * Function to process paths received for a new peer addition. The recorded
754 * paths form the initial tunnel, which can be optimized later.
755 * Called on each result obtained for the DHT search.
756 *
757 * @param cls closure
758 * @param exp when will this value expire
759 * @param key key of the result
760 * @param type type of the result
761 * @param size number of bytes in data
762 * @param data pointer to the result data
763 */
764static void
765dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
766 const struct GNUNET_HashCode * key,
767 const struct GNUNET_PeerIdentity *get_path,
768 unsigned int get_path_length,
769 const struct GNUNET_PeerIdentity *put_path,
770 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
771 size_t size, const void *data);
772
773
774/**
775 * Retrieve the MeshPeer stucture associated with the peer, create one
776 * and insert it in the appropriate structures if the peer is not known yet.
777 *
778 * @param peer_id Full identity of the peer.
779 *
780 * @return Existing or newly created peer info.
781 */
782static struct MeshPeer *
783peer_get (const struct GNUNET_PeerIdentity *peer_id);
784
785
786/**
787 * Retrieve the MeshPeer stucture associated with the peer, create one
788 * and insert it in the appropriate structures if the peer is not known yet.
789 *
790 * @param peer Short identity of the peer.
791 *
792 * @return Existing or newly created peer info.
793 */
794static struct MeshPeer *
795peer_get_short (const GNUNET_PEER_Id peer);
796
797
798/**
799 * Build a PeerPath from the paths returned from the DHT, reversing the paths
800 * to obtain a local peer -> destination path and interning the peer ids.
801 *
802 * @return Newly allocated and created path
803 */
804static struct MeshPeerPath *
805path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
806 unsigned int get_path_length,
807 const struct GNUNET_PeerIdentity *put_path,
808 unsigned int put_path_length);
809
810
811/**
812 * Adds a path to the peer_infos of all the peers in the path
813 *
814 * @param p Path to process.
815 * @param confirmed Whether we know if the path works or not.
816 */
817static void
818path_add_to_peers (struct MeshPeerPath *p, int confirmed);
819
820
821
822/**
823 * Search for a tunnel by global ID using full PeerIdentities.
824 *
825 * @param oid owner of the tunnel.
826 * @param tid global tunnel number.
827 *
828 * @return tunnel handler, NULL if doesn't exist.
829 */
830static struct MeshTunnel *
831tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid);
832
833
834/**
835 * Change the tunnel state.
836 *
837 * @param t Tunnel whose ttate to change.
838 * @param state New state.
839 */
840static void
841tunnel_change_state (struct MeshTunnel *t, enum MeshTunnelState state);
842
843
844/**
845 * Notify a tunnel that a connection has broken that affects at least
846 * some of its peers.
847 *
848 * @param t Tunnel affected.
849 * @param p1 Peer that got disconnected from p2.
850 * @param p2 Peer that got disconnected from p1.
851 *
852 * @return Short ID of the peer disconnected (either p1 or p2).
853 * 0 if the tunnel remained unaffected.
854 */
855static GNUNET_PEER_Id
856tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
857 GNUNET_PEER_Id p2);
858
859
860/**
861 * Send FWD keepalive packets for a tunnel.
862 *
863 * @param cls Closure (tunnel for which to send the keepalive).
864 * @param tc Notification context.
865 */
866static void
867tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
868
869/**
870 * Send BCK keepalive packets for a tunnel.
871 *
872 * @param cls Closure (tunnel for which to send the keepalive).
873 * @param tc Notification context.
874 */
875static void
876tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
877
878/**
879 * @brief Use the given path for the tunnel.
880 * Update the next and prev hops (and RCs).
881 * (Re)start the path refresh in case the tunnel is locally owned.
882 *
883 * @param t Tunnel to update.
884 * @param p Path to use.
885 */
886static void
887tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p);
888
889/**
890 * Tunnel is empty: destroy it.
891 *
892 * Notifies all participants (peers, cleints) about the destruction.
893 *
894 * @param t Tunnel to destroy.
895 */
896static void
897tunnel_destroy_empty (struct MeshTunnel *t);
898
899/**
900 * Destroy the tunnel.
901 *
902 * This function does not generate any warning traffic to clients or peers.
903 *
904 * Tasks:
905 * Remove the tunnel from peer_info's and clients' hashmaps.
906 * Cancel messages belonging to this tunnel queued to neighbors.
907 * Free any allocated resources linked to the tunnel.
908 *
909 * @param t the tunnel to destroy
910 *
911 * @return GNUNET_OK on success
912 */
913static int
914tunnel_destroy (struct MeshTunnel *t);
915
916/**
917 * @brief Queue and pass message to core when possible.
918 *
919 * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status
920 * and accounts for it. In case the queue is full, the message is dropped and
921 * a break issued.
922 *
923 * Otherwise, message is treated as internal and allowed to go regardless of
924 * queue status.
925 *
926 * @param cls Closure (@c type dependant). It will be used by queue_send to
927 * build the message to be sent if not already prebuilt.
928 * @param type Type of the message, 0 for a raw message.
929 * @param size Size of the message.
930 * @param dst Neighbor to send message to.
931 * @param t Tunnel this message belongs to.
932 */
933static void
934queue_add (void *cls, uint16_t type, size_t size,
935 struct MeshPeer *dst, struct MeshTunnel *t);
936
937
938/**
939 * Free a transmission that was already queued with all resources
940 * associated to the request.
941 *
942 * @param queue Queue handler to cancel.
943 * @param clear_cls Is it necessary to free associated cls?
944 */
945static void
946queue_destroy (struct MeshPeerQueue *queue, int clear_cls);
947
948
949/**
950 * @brief Get the next transmittable message from the queue.
951 *
952 * This will be the head, except in the case of being a data packet
953 * not allowed by the destination peer.
954 *
955 * @param peer Destination peer.
956 *
957 * @return The next viable MeshPeerQueue element to send to that peer.
958 * NULL when there are no transmittable messages.
959 */
960struct MeshPeerQueue *
961queue_get_next (const struct MeshPeer *peer);
962
963
964/**
965 * Core callback to write a queued packet to core buffer
966 *
967 * @param cls Closure (peer info).
968 * @param size Number of bytes available in buf.
969 * @param buf Where the to write the message.
970 *
971 * @return number of bytes written to buf
972 */
973static size_t
974queue_send (void *cls, size_t size, void *buf);
975
976
977/**
978 * Dummy function to separate declarations from definitions in function list.
979 */
980void
981__mesh_divider______________________________________________________________();
982
983
984static const char *
985GNUNET_MESH_DEBUG_S2S (enum MeshTunnelState s)
986{
987 static char buf[128];
988
989 switch (s)
990 {
991 /**
992 * Uninitialized status, should never appear in operation.
993 */
994 case MESH_TUNNEL_NEW: return "MESH_TUNNEL_NEW";
995
996 /**
997 * Path to the peer not known yet
998 */
999 case MESH_TUNNEL_SEARCHING: return "MESH_TUNNEL_SEARCHING";
1000
1001 /**
1002 * Request sent, not yet answered.
1003 */
1004 case MESH_TUNNEL_WAITING: return "MESH_TUNNEL_WAITING";
1005
1006 /**
1007 * Peer connected and ready to accept data
1008 */
1009 case MESH_TUNNEL_READY: return "MESH_TUNNEL_READY";
1010
1011 /**
1012 * Peer connected previosly but not responding
1013 */
1014 case MESH_TUNNEL_RECONNECTING: return "MESH_TUNNEL_RECONNECTING";
1015
1016 default:
1017 sprintf (buf, "%u (UNKNOWN STATE)", s);
1018 return buf;
1019 }
1020}
1021
1022
1023/******************************************************************************/
1024/************************ PERIODIC FUNCTIONS ****************************/
1025/******************************************************************************/
1026
1027/**
1028 * Periodically announce self id in the DHT
1029 *
1030 * @param cls closure
1031 * @param tc task context
1032 */
1033static void
1034announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1035{
1036 struct PBlock block;
1037 struct GNUNET_HashCode phash;
1038
1039 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1040 {
1041 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
1042 return;
1043 }
1044 /* TODO
1045 * - Set data expiration in function of X
1046 * - Adapt X to churn
1047 */
1048 DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id));
1049 GNUNET_CRYPTO_hash (&my_full_id, sizeof (my_full_id), &phash);
1050 block.id = my_full_id;
1051 GNUNET_DHT_put (dht_handle, /* DHT handle */
1052 &phash,
1053 dht_replication_level, /* Replication level */
1054 GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */
1055 GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */
1056 sizeof (block), /* Size of the data */
1057 (const char *) &block, /* Data itself */
1058 GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */
1059 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
1060 NULL, /* Continuation */
1061 NULL); /* Continuation closure */
1062 announce_id_task =
1063 GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls);
1064}
1065
1066
1067/******************************************************************************/
1068/****************** GENERAL HELPER FUNCTIONS ************************/
1069/******************************************************************************/
1070
1071
1072/**
1073 * Check if client has registered with the service and has not disconnected
1074 *
1075 * @param client the client to check
1076 *
1077 * @return non-NULL if client exists in the global DLL
1078 */
1079static struct MeshClient *
1080client_get (struct GNUNET_SERVER_Client *client)
1081{
1082 return GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
1083}
1084
1085
1086/**
1087 * Deletes a tunnel from a client (either owner or destination). To be used on
1088 * tunnel destroy.
1089 *
1090 * @param c Client whose tunnel to delete.
1091 * @param t Tunnel which should be deleted.
1092 */
1093static void
1094client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t)
1095{
1096 int res;
1097
1098 if (c == t->owner)
1099 {
1100 res = GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
1101 t->local_tid, t);
1102 if (GNUNET_YES != res)
1103 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel owner KO\n");
1104 }
1105 if (c == t->client)
1106 {
1107 res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
1108 t->local_tid_dest, t);
1109 if (GNUNET_YES != res)
1110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n");
1111 }
1112}
1113
1114
1115/**
1116 * Notify the appropriate client that a new incoming tunnel was created.
1117 *
1118 * @param t Tunnel that was created.
1119 */
1120static void
1121send_local_tunnel_create (struct MeshTunnel *t)
1122{
1123 struct GNUNET_MESH_TunnelMessage msg;
1124
1125 if (NULL == t->client)
1126 return;
1127 msg.header.size = htons (sizeof (msg));
1128 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1129 msg.tunnel_id = htonl (t->local_tid_dest);
1130 msg.port = htonl (t->port);
1131 msg.opt = 0;
1132 msg.opt |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0;
1133 msg.opt |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0;
1134 msg.opt = htonl (msg.opt);
1135 GNUNET_PEER_resolve (t->id.oid, &msg.peer);
1136 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1137 &msg.header, GNUNET_NO);
1138}
1139
1140
1141/**
1142 * Notify a client that the incoming tunnel is no longer valid.
1143 *
1144 * @param t Tunnel that is destroyed.
1145 * @param fwd Forward notification (owner->dest)?
1146 */
1147static void
1148send_local_tunnel_destroy (struct MeshTunnel *t, int fwd)
1149{
1150 struct GNUNET_MESH_TunnelMessage msg;
1151 struct MeshClient *c;
1152
1153 c = fwd ? t->client : t->owner;
1154 if (NULL == c)
1155 {
1156 GNUNET_break (0);
1157 return;
1158 }
1159 msg.header.size = htons (sizeof (msg));
1160 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1161 msg.tunnel_id = htonl (fwd ? t->local_tid_dest : t->local_tid);
1162 msg.port = htonl (0);
1163 memset (&msg.peer, 0, sizeof (msg.peer));
1164 msg.opt = htonl (0);
1165 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
1166 &msg.header, GNUNET_NO);
1167}
1168
1169
1170/**
1171 * Build a local ACK message and send it to a local client.
1172 *
1173 * @param t Tunnel on which to send the ACK.
1174 * @param c Client to whom send the ACK.
1175 * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner)
1176 */
1177static void
1178send_local_ack (struct MeshTunnel *t,
1179 struct MeshClient *c,
1180 int is_fwd)
1181{
1182 struct GNUNET_MESH_LocalAck msg;
1183
1184 msg.header.size = htons (sizeof (msg));
1185 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
1186 msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest);
1187 GNUNET_SERVER_notification_context_unicast (nc,
1188 c->handle,
1189 &msg.header,
1190 GNUNET_NO);
1191}
1192
1193
1194
1195/**
1196 * Sends an already built message to a peer, properly registrating
1197 * all used resources.
1198 *
1199 * @param message Message to send. Function makes a copy of it.
1200 * @param peer Short ID of the neighbor whom to send the message.
1201 * @param t Tunnel on which this message is transmitted.
1202 */
1203static void
1204send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1205 GNUNET_PEER_Id peer,
1206 struct MeshTunnel *t)
1207{
1208 struct GNUNET_PeerIdentity id;
1209 struct MeshPeer *neighbor;
1210 struct MeshPeerPath *p;
1211 void *data;
1212 size_t size;
1213 uint16_t type;
1214
1215// GNUNET_TRANSPORT_try_connect(); FIXME use?
1216
1217 if (0 == peer)
1218 return;
1219
1220 size = ntohs (message->size);
1221 data = GNUNET_malloc (size);
1222 memcpy (data, message, size);
1223 type = ntohs(message->type);
1224 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type ||
1225 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
1226 {
1227 struct GNUNET_MESH_Data *u;
1228
1229 u = (struct GNUNET_MESH_Data *) data;
1230 u->ttl = htonl (ntohl (u->ttl) - 1);
1231 }
1232 GNUNET_PEER_resolve (peer, &id);
1233 neighbor = peer_get (&id);
1234 for (p = neighbor->path_head; NULL != p; p = p->next)
1235 {
1236 if (2 >= p->length)
1237 {
1238 break;
1239 }
1240 }
1241 if (NULL == p)
1242 {
1243#if MESH_DEBUG
1244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1245 " %s IS NOT DIRECTLY CONNECTED\n",
1246 GNUNET_i2s(&id));
1247 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1248 " PATHS TO %s:\n",
1249 GNUNET_i2s(&id));
1250 for (p = neighbor->path_head; NULL != p; p = p->next)
1251 {
1252 struct GNUNET_PeerIdentity debug_id;
1253 unsigned int i;
1254
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1256 " path with %u hops through:\n",
1257 p->length);
1258 for (i = 0; i < p->length; i++)
1259 {
1260 GNUNET_PEER_resolve(p->peers[i], &debug_id);
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 " hop %u: %s\n",
1263 i, GNUNET_i2s(&debug_id));
1264 }
1265 }
1266#endif
1267 GNUNET_break (0);
1268 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1269 " no direct connection to %s\n",
1270 GNUNET_i2s (&id));
1271 GNUNET_free (data);
1272 return;
1273 }
1274 if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type)
1275 type = 0;
1276 queue_add (data,
1277 type,
1278 size,
1279 neighbor,
1280 t);
1281}
1282
1283
1284/**
1285 * Sends a CREATE PATH message for a path to a peer, properly registrating
1286 * all used resources.
1287 *
1288 * @param t Tunnel for which the path is created.
1289 */
1290static void
1291send_path_create (struct MeshTunnel *t)
1292{
1293 struct MeshPeer *neighbor;
1294
1295 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n");
1296 neighbor = peer_get_short (t->next_hop);
1297 queue_add (t,
1298 GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE,
1299 sizeof (struct GNUNET_MESH_CreateTunnel) +
1300 (t->path->length * sizeof (struct GNUNET_PeerIdentity)),
1301 neighbor,
1302 t);
1303 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1304}
1305
1306
1307/**
1308 * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us.
1309 *
1310 * @param t Tunnel which to confirm.
1311 */
1312static void
1313send_path_ack (struct MeshTunnel *t)
1314{
1315 struct MeshPeer *neighbor;
1316
1317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send path ack\n");
1318 neighbor = peer_get_short (t->prev_hop);
1319 queue_add (t,
1320 GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1321 sizeof (struct GNUNET_MESH_PathACK),
1322 neighbor,
1323 t);
1324 tunnel_change_state (t, MESH_TUNNEL_WAITING);
1325}
1326
1327
1328/**
1329 * Build an ACK message and queue it to send to the given peer.
1330 *
1331 * @param t Tunnel on which to send the ACK.
1332 * @param peer Peer to whom send the ACK.
1333 * @param ack Value of the ACK.
1334 */
1335static void
1336send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack)
1337{
1338 struct GNUNET_MESH_ACK msg;
1339
1340 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
1341 msg.header.size = htons (sizeof (msg));
1342 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK);
1343 msg.pid = htonl (ack);
1344 msg.tid = htonl (t->id.tid);
1345
1346 send_prebuilt_message (&msg.header, peer, t);
1347}
1348
1349
1350/**
1351 * Core callback to write a pre-constructed data packet to core buffer
1352 *
1353 * @param cls Closure (MeshTransmissionDescriptor with data in "data" member).
1354 * @param size Number of bytes available in buf.
1355 * @param buf Where the to write the message.
1356 *
1357 * @return number of bytes written to buf
1358 */
1359static size_t
1360send_core_data_raw (void *cls, size_t size, void *buf)
1361{
1362 struct GNUNET_MessageHeader *msg = cls;
1363 size_t total_size;
1364
1365 GNUNET_assert (NULL != msg);
1366 total_size = ntohs (msg->size);
1367
1368 if (total_size > size)
1369 {
1370 GNUNET_break (0);
1371 return 0;
1372 }
1373 memcpy (buf, msg, total_size);
1374 GNUNET_free (cls);
1375 return total_size;
1376}
1377
1378
1379/**
1380 * Function to send a create path packet to a peer.
1381 *
1382 * @param cls closure
1383 * @param size number of bytes available in buf
1384 * @param buf where the callee should write the message
1385 * @return number of bytes written to buf
1386 */
1387static size_t
1388send_core_path_create (void *cls, size_t size, void *buf)
1389{
1390 struct MeshTunnel *t = cls;
1391 struct GNUNET_MESH_CreateTunnel *msg;
1392 struct GNUNET_PeerIdentity *peer_ptr;
1393 struct MeshPeerPath *p = t->path;
1394 size_t size_needed;
1395 uint32_t opt;
1396 int i;
1397
1398 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n");
1399 size_needed =
1400 sizeof (struct GNUNET_MESH_CreateTunnel) +
1401 p->length * sizeof (struct GNUNET_PeerIdentity);
1402
1403 if (size < size_needed || NULL == buf)
1404 {
1405 GNUNET_break (0);
1406 return 0;
1407 }
1408 msg = (struct GNUNET_MESH_CreateTunnel *) buf;
1409 msg->header.size = htons (size_needed);
1410 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1411 msg->tid = ntohl (t->id.tid);
1412
1413 opt = 0;
1414 if (GNUNET_YES == t->nobuffer)
1415 opt |= GNUNET_MESH_OPTION_NOBUFFER;
1416 if (GNUNET_YES == t->reliable)
1417 opt |= GNUNET_MESH_OPTION_RELIABLE;
1418 msg->opt = htonl (opt);
1419 msg->port = htonl (t->port);
1420
1421 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1422 for (i = 0; i < p->length; i++)
1423 {
1424 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1425 }
1426
1427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1428 "CREATE PATH (%u bytes long) sent!\n", size_needed);
1429 return size_needed;
1430}
1431
1432
1433/**
1434 * Creates a path ack message in buf and frees all unused resources.
1435 *
1436 * @param cls closure (MeshTransmissionDescriptor)
1437 * @param size number of bytes available in buf
1438 * @param buf where the callee should write the message
1439 * @return number of bytes written to buf
1440 */
1441static size_t
1442send_core_path_ack (void *cls, size_t size, void *buf)
1443{
1444 struct MeshTunnel *t = cls;
1445 struct GNUNET_MESH_PathACK *msg = buf;
1446
1447 GNUNET_assert (NULL != t);
1448 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1449 {
1450 GNUNET_break (0);
1451 return 0;
1452 }
1453 t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1;
1454 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1455 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1456 GNUNET_PEER_resolve (t->id.oid, &msg->oid);
1457 msg->tid = htonl (t->id.tid);
1458 msg->peer_id = my_full_id;
1459 msg->ack = htonl (t->prev_fc.last_ack_sent);
1460
1461 /* TODO add signature */
1462
1463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n");
1464 return sizeof (struct GNUNET_MESH_PathACK);
1465}
1466
1467
1468/**
1469 * Iterator over all the peers to remove the oldest not-used entry.
1470 *
1471 * @param cls Closure (unsued).
1472 * @param key ID of the peer.
1473 * @param value Peer_Info of the peer.
1474 *
1475 * FIXME implement
1476 */
1477static int
1478peer_timeout (void *cls,
1479 const struct GNUNET_PeerIdentity *key,
1480 void *value)
1481{
1482 return GNUNET_YES;
1483}
1484
1485
1486/**
1487 * Retrieve the MeshPeer stucture associated with the peer, create one
1488 * and insert it in the appropriate structures if the peer is not known yet.
1489 *
1490 * @param peer_id Full identity of the peer.
1491 *
1492 * @return Existing or newly created peer info.
1493 */
1494static struct MeshPeer *
1495peer_get (const struct GNUNET_PeerIdentity *peer_id)
1496{
1497 struct MeshPeer *peer;
1498
1499 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1500 if (NULL == peer)
1501 {
1502 peer = GNUNET_new (struct MeshPeer);
1503 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1504 {
1505 GNUNET_CONTAINER_multipeermap_iterate (peers,
1506 &peer_timeout,
1507 NULL);
1508 }
1509 GNUNET_CONTAINER_multipeermap_put (peers, peer_id, peer,
1510 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1511 peer->id = GNUNET_PEER_intern (peer_id);
1512 }
1513 peer->last_contact = GNUNET_TIME_absolute_get();
1514
1515 return peer;
1516}
1517
1518
1519/**
1520 * Retrieve the MeshPeer stucture associated with the peer, create one
1521 * and insert it in the appropriate structures if the peer is not known yet.
1522 *
1523 * @param peer Short identity of the peer.
1524 *
1525 * @return Existing or newly created peer info.
1526 */
1527static struct MeshPeer *
1528peer_get_short (const GNUNET_PEER_Id peer)
1529{
1530 return peer_get (GNUNET_PEER_resolve2 (peer));
1531}
1532
1533
1534/**
1535 * Select which PID to POLL for, to compensate for lost messages.
1536 *
1537 * @param p Peer we want to poll.
1538 * @param t Tunnel about which we want to poll.
1539 *
1540 * @return PID to use, either last sent or first_in_queue - 1
1541 */
1542static uint32_t
1543peer_get_first_payload_pid (struct MeshPeer *p, struct MeshTunnel *t)
1544{
1545 struct MeshPeerQueue *q;
1546 uint16_t type;
1547
1548 type = p->id == t->next_hop ? GNUNET_MESSAGE_TYPE_MESH_UNICAST :
1549 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN;
1550
1551 for (q = p->queue_head; NULL != q; q = q->next)
1552 {
1553 if (q->type == type && q->tunnel == t)
1554 {
1555 struct GNUNET_MESH_Data *msg = q->cls;
1556
1557 /* Pretend that the last one sent was the previous to this */
1558 return ntohl (msg->pid) - 1;
1559 }
1560 }
1561
1562 /* No data in queue, use last sent */
1563 {
1564 struct MeshFlowControl *fc;
1565
1566 fc = p->id == t->next_hop ? &t->next_fc : &t->prev_fc;
1567 return fc->last_pid_sent;
1568 }
1569}
1570
1571
1572/**
1573 * Choose the best path towards a peer considering the tunnel properties.
1574 *
1575 * @param peer The destination peer.
1576 * @param t The tunnel the path is for.
1577 *
1578 * @return Best current known path towards the peer, if any.
1579 */
1580static struct MeshPeerPath *
1581peer_get_best_path (const struct MeshPeer *peer, const struct MeshTunnel *t)
1582{
1583 struct MeshPeerPath *best_p;
1584 struct MeshPeerPath *p;
1585 unsigned int best_cost;
1586 unsigned int cost;
1587
1588 best_p = p = peer->path_head;
1589 best_cost = cost = p->length;
1590 while (NULL != p)
1591 {
1592 if ((cost = p->length) < best_cost)
1593 {
1594 best_cost = cost;
1595 best_p = p;
1596 }
1597 p = p->next;
1598 }
1599 return best_p;
1600}
1601
1602
1603/**
1604 * Try to establish a new connection to this peer in the given tunnel.
1605 * If the peer doesn't have any path to it yet, try to get one.
1606 * If the peer already has some path, send a CREATE PATH towards it.
1607 *
1608 * @param peer PeerInfo of the peer.
1609 * @param t Tunnel for which to create the path, if possible.
1610 */
1611static void
1612peer_connect (struct MeshPeer *peer, struct MeshTunnel *t)
1613{
1614 struct MeshPeerPath *p;
1615 struct GNUNET_HashCode phash;
1616
1617 if (NULL != peer->path_head)
1618 {
1619 p = peer_get_best_path (peer, t);
1620 tunnel_use_path (t, p);
1621 send_path_create (t);
1622 }
1623 else if (NULL == peer->dhtget)
1624 {
1625 struct GNUNET_PeerIdentity id;
1626
1627 GNUNET_PEER_resolve (peer->id, &id);
1628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1629 "Starting DHT GET for peer %s\n",
1630 GNUNET_i2s (&id));
1631 GNUNET_CRYPTO_hash (&id, sizeof (my_full_id), &phash);
1632 peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */
1633 GNUNET_BLOCK_TYPE_MESH_PEER, /* type */
1634 &phash, /* key to search */
1635 dht_replication_level, /* replication level */
1636 GNUNET_DHT_RO_RECORD_ROUTE |
1637 GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE,
1638 NULL, /* xquery */
1639 0, /* xquery bits */
1640 &dht_get_id_handler, peer);
1641 tunnel_change_state (t, MESH_TUNNEL_SEARCHING);
1642 }
1643 else
1644 {
1645 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1646 "There is no path but the DHT GET is already started.\n");
1647 }
1648}
1649
1650
1651/**
1652 * @brief Re-initiate traffic to this peer if necessary.
1653 *
1654 * Check if there is traffic queued towards this peer
1655 * and the core transmit handle is NULL (traffic was stalled).
1656 * If so, call core tmt rdy.
1657 *
1658 * @param peer_id Short ID of peer to which initiate traffic.
1659 */
1660static void
1661peer_unlock_queue (GNUNET_PEER_Id peer_id)
1662{
1663 struct MeshPeer *peer;
1664 struct MeshPeerQueue *q;
1665 size_t size;
1666
1667 peer = peer_get_short (peer_id);
1668 if (NULL != peer->core_transmit)
1669 return;
1670
1671 q = queue_get_next (peer);
1672 if (NULL == q)
1673 return;
1674
1675 size = q->size;
1676 peer->core_transmit =
1677 GNUNET_CORE_notify_transmit_ready (core_handle,
1678 GNUNET_NO,
1679 0,
1680 GNUNET_TIME_UNIT_FOREVER_REL,
1681 GNUNET_PEER_resolve2 (peer->id),
1682 size,
1683 &queue_send,
1684 peer);
1685}
1686
1687
1688/**
1689 * Cancel all transmissions towards a neighbor that belong to a certain tunnel.
1690 *
1691 * @param neighbor Short ID of the neighbor to whom cancel the transmissions.
1692 * @param t Tunnel which to cancel.
1693 */
1694static void
1695peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t)
1696{
1697 struct MeshPeer *peer;
1698 struct MeshPeerQueue *q;
1699 struct MeshPeerQueue *next;
1700 struct MeshFlowControl *fc;
1701
1702 if (0 == neighbor)
1703 return; /* Was local peer, 0'ed in tunnel_destroy_iterator */
1704 peer = peer_get_short (neighbor);
1705 for (q = peer->queue_head; NULL != q; q = next)
1706 {
1707 next = q->next;
1708 if (q->tunnel == t)
1709 {
1710 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == q->type ||
1711 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == q->type)
1712 {
1713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1714 "peer_cancel_queues %s\n",
1715 GNUNET_MESH_DEBUG_M2S (q->type));
1716 }
1717 queue_destroy (q, GNUNET_YES);
1718 }
1719 }
1720 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1721 {
1722 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1723 peer->core_transmit = NULL;
1724 }
1725 fc = neighbor == t->next_hop ? &t->next_fc : &t->prev_fc;
1726 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
1727 {
1728 GNUNET_SCHEDULER_cancel (fc->poll_task);
1729 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
1730 }
1731}
1732
1733
1734/**
1735 * Destroy the peer_info and free any allocated resources linked to it
1736 *
1737 * @param peer The peer_info to destroy.
1738 *
1739 * @return GNUNET_OK on success
1740 */
1741static int
1742peer_destroy (struct MeshPeer *peer)
1743{
1744 struct GNUNET_PeerIdentity id;
1745 struct MeshPeerPath *p;
1746 struct MeshPeerPath *nextp;
1747 unsigned int i;
1748
1749 GNUNET_PEER_resolve (peer->id, &id);
1750 GNUNET_PEER_change_rc (peer->id, -1);
1751
1752 if (GNUNET_YES !=
1753 GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
1754 {
1755 GNUNET_break (0);
1756 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1757 "removing peer %s, not in hashmap\n", GNUNET_i2s (&id));
1758 }
1759 if (NULL != peer->dhtget)
1760 {
1761 GNUNET_DHT_get_stop (peer->dhtget);
1762 }
1763 p = peer->path_head;
1764 while (NULL != p)
1765 {
1766 nextp = p->next;
1767 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1768 path_destroy (p);
1769 p = nextp;
1770 }
1771 for (i = 0; i < peer->ntunnels; i++)
1772 tunnel_destroy_empty (peer->tunnels[i]);
1773 GNUNET_array_grow (peer->tunnels, peer->ntunnels, 0);
1774 GNUNET_free (peer);
1775 return GNUNET_OK;
1776}
1777
1778
1779/**
1780 * Remove all paths that rely on a direct connection between p1 and p2
1781 * from the peer itself and notify all tunnels about it.
1782 *
1783 * @param peer PeerInfo of affected peer.
1784 * @param p1 GNUNET_PEER_Id of one peer.
1785 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
1786 * no longer is.
1787 *
1788 * TODO: optimize (see below)
1789 */
1790static void
1791peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1,
1792 GNUNET_PEER_Id p2)
1793{
1794 struct MeshPeerPath *p;
1795 struct MeshPeerPath *next;
1796 struct MeshPeer *peer_d;
1797 GNUNET_PEER_Id d;
1798 unsigned int destroyed;
1799 unsigned int i;
1800
1801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n");
1802 destroyed = 0;
1803 for (p = peer->path_head; NULL != p; p = next)
1804 {
1805 next = p->next;
1806 for (i = 0; i < (p->length - 1); i++)
1807 {
1808 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
1809 (p->peers[i] == p2 && p->peers[i + 1] == p1))
1810 {
1811 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
1812 path_destroy (p);
1813 destroyed++;
1814 break;
1815 }
1816 }
1817 }
1818 if (0 == destroyed)
1819 return;
1820
1821 for (i = 0; i < peer->ntunnels; i++)
1822 {
1823 d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2);
1824 if (0 == d)
1825 continue;
1826
1827 peer_d = peer_get_short (d);
1828 next = peer_get_best_path (peer_d, peer->tunnels[i]);
1829 tunnel_use_path (peer->tunnels[i], next);
1830 peer_connect (peer_d, peer->tunnels[i]);
1831 }
1832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n");
1833}
1834
1835
1836/**
1837 * Add the path to the peer and update the path used to reach it in case this
1838 * is the shortest.
1839 *
1840 * @param peer_info Destination peer to add the path to.
1841 * @param path New path to add. Last peer must be the peer in arg 1.
1842 * Path will be either used of freed if already known.
1843 * @param trusted Do we trust that this path is real?
1844 */
1845void
1846peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path,
1847 int trusted)
1848{
1849 struct MeshPeerPath *aux;
1850 unsigned int l;
1851 unsigned int l2;
1852
1853 if ((NULL == peer_info) || (NULL == path))
1854 {
1855 GNUNET_break (0);
1856 path_destroy (path);
1857 return;
1858 }
1859 if (path->peers[path->length - 1] != peer_info->id)
1860 {
1861 GNUNET_break (0);
1862 path_destroy (path);
1863 return;
1864 }
1865 if (2 >= path->length && GNUNET_NO == trusted)
1866 {
1867 /* Only allow CORE to tell us about direct paths */
1868 path_destroy (path);
1869 return;
1870 }
1871 for (l = 1; l < path->length; l++)
1872 {
1873 if (path->peers[l] == myid)
1874 {
1875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l);
1876 for (l2 = 0; l2 < path->length - l; l2++)
1877 {
1878 path->peers[l2] = path->peers[l + l2];
1879 }
1880 path->length -= l;
1881 l = 1;
1882 path->peers =
1883 GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id));
1884 }
1885 }
1886#if MESH_DEBUG
1887 {
1888 struct GNUNET_PeerIdentity id;
1889
1890 GNUNET_PEER_resolve (peer_info->id, &id);
1891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1892 path->length, GNUNET_i2s (&id));
1893 }
1894#endif
1895 l = path_get_length (path);
1896 if (0 == l)
1897 {
1898 path_destroy (path);
1899 return;
1900 }
1901
1902 GNUNET_assert (peer_info->id == path->peers[path->length - 1]);
1903 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
1904 {
1905 l2 = path_get_length (aux);
1906 if (l2 > l)
1907 {
1908 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
1909 peer_info->path_tail, aux, path);
1910 return;
1911 }
1912 else
1913 {
1914 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
1915 {
1916 path_destroy (path);
1917 return;
1918 }
1919 }
1920 }
1921 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail,
1922 path);
1923 return;
1924}
1925
1926
1927/**
1928 * Add the path to the origin peer and update the path used to reach it in case
1929 * this is the shortest.
1930 * The path is given in peer_info -> destination, therefore we turn the path
1931 * upside down first.
1932 *
1933 * @param peer_info Peer to add the path to, being the origin of the path.
1934 * @param path New path to add after being inversed.
1935 * Path will be either used or freed.
1936 * @param trusted Do we trust that this path is real?
1937 */
1938static void
1939peer_add_path_to_origin (struct MeshPeer *peer_info,
1940 struct MeshPeerPath *path, int trusted)
1941{
1942 path_invert (path);
1943 peer_add_path (peer_info, path, trusted);
1944}
1945
1946
1947/**
1948 * Add a tunnel to the list of tunnels a peer participates in.
1949 * Update the tunnel's destination.
1950 *
1951 * @param p Peer to add to.
1952 * @param t Tunnel to add.
1953 */
1954static void
1955peer_add_tunnel (struct MeshPeer *p, struct MeshTunnel *t)
1956{
1957 if (0 != t->dest)
1958 {
1959 GNUNET_break (t->dest == p->id);
1960 return;
1961 }
1962 t->dest = p->id;
1963 GNUNET_PEER_change_rc (t->dest, 1);
1964 GNUNET_array_append (p->tunnels, p->ntunnels, t);
1965}
1966
1967
1968/**
1969 * Remove a tunnel from the list of tunnels a peer participates in.
1970 * Free the tunnel's destination.
1971 *
1972 * @param p Peer to clean.
1973 * @param t Tunnel to remove.
1974 */
1975static void
1976peer_remove_tunnel (struct MeshPeer *p, struct MeshTunnel *t)
1977{
1978 unsigned int i;
1979
1980 if (t->dest == p->id)
1981 {
1982 GNUNET_PEER_change_rc (t->dest, -1);
1983 t->dest = 0;
1984 }
1985 for (i = 0; i < p->ntunnels; i++)
1986 {
1987 if (p->tunnels[i] == t)
1988 {
1989 p->tunnels[i] = p->tunnels[p->ntunnels - 1];
1990 GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1);
1991 return;
1992 }
1993 }
1994}
1995
1996
1997/**
1998 * Function called if the connection to the peer has been stalled for a while,
1999 * possibly due to a missed ACK. Poll the peer about its ACK status.
2000 *
2001 * @param cls Closure (poll ctx).
2002 * @param tc TaskContext.
2003 */
2004static void
2005tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2006{
2007 struct MeshFlowControl *fc = cls;
2008 struct GNUNET_MESH_Poll msg;
2009 struct MeshTunnel *t = fc->t;
2010 GNUNET_PEER_Id peer;
2011
2012 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
2013 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2014 {
2015 return;
2016 }
2017
2018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n");
2019
2020 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2021
2022 if (fc == &t->prev_fc)
2023 {
2024 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n");
2025 peer = t->prev_hop;
2026 }
2027 else if (fc == &t->next_fc)
2028 {
2029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n");
2030 peer = t->next_hop;
2031 }
2032 else
2033 {
2034 GNUNET_break (0);
2035 return;
2036 }
2037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** peer: %s!\n",
2038 GNUNET_i2s(GNUNET_PEER_resolve2 (peer)));
2039 if (0 == peer)
2040 {
2041 if (GNUNET_YES == t->destroy)
2042 tunnel_destroy (t);
2043 else
2044 GNUNET_break (0);
2045
2046 return;
2047 }
2048 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL);
2049 msg.header.size = htons (sizeof (msg));
2050 msg.tid = htonl (t->id.tid);
2051 msg.pid = htonl (peer_get_first_payload_pid (peer_get_short (peer), t));
2052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", ntohl (msg.pid));
2053 send_prebuilt_message (&msg.header, peer, t);
2054 fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time);
2055 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
2056 &tunnel_poll, fc);
2057}
2058
2059
2060/**
2061 * Build a PeerPath from the paths returned from the DHT, reversing the paths
2062 * to obtain a local peer -> destination path and interning the peer ids.
2063 *
2064 * @return Newly allocated and created path
2065 */
2066static struct MeshPeerPath *
2067path_build_from_dht (const struct GNUNET_PeerIdentity *get_path,
2068 unsigned int get_path_length,
2069 const struct GNUNET_PeerIdentity *put_path,
2070 unsigned int put_path_length)
2071{
2072 struct MeshPeerPath *p;
2073 GNUNET_PEER_Id id;
2074 int i;
2075
2076 p = path_new (1);
2077 p->peers[0] = myid;
2078 GNUNET_PEER_change_rc (myid, 1);
2079 i = get_path_length;
2080 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i);
2081 for (i--; i >= 0; i--)
2082 {
2083 id = GNUNET_PEER_intern (&get_path[i]);
2084 if (p->length > 0 && id == p->peers[p->length - 1])
2085 {
2086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2087 GNUNET_PEER_change_rc (id, -1);
2088 }
2089 else
2090 {
2091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n",
2092 GNUNET_i2s (&get_path[i]));
2093 p->length++;
2094 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2095 p->peers[p->length - 1] = id;
2096 }
2097 }
2098 i = put_path_length;
2099 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i);
2100 for (i--; i >= 0; i--)
2101 {
2102 id = GNUNET_PEER_intern (&put_path[i]);
2103 if (id == myid)
2104 {
2105 /* PUT path went through us, so discard the path up until now and start
2106 * from here to get a much shorter (and loop-free) path.
2107 */
2108 path_destroy (p);
2109 p = path_new (0);
2110 }
2111 if (p->length > 0 && id == p->peers[p->length - 1])
2112 {
2113 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n");
2114 GNUNET_PEER_change_rc (id, -1);
2115 }
2116 else
2117 {
2118 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n",
2119 GNUNET_i2s (&put_path[i]));
2120 p->length++;
2121 p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length);
2122 p->peers[p->length - 1] = id;
2123 }
2124 }
2125#if MESH_DEBUG
2126 if (get_path_length > 0)
2127 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n",
2128 GNUNET_i2s (&get_path[0]));
2129 if (put_path_length > 0)
2130 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n",
2131 GNUNET_i2s (&put_path[0]));
2132 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n",
2133 p->length);
2134 for (i = 0; i < p->length; i++)
2135 {
2136 struct GNUNET_PeerIdentity peer_id;
2137
2138 GNUNET_PEER_resolve (p->peers[i], &peer_id);
2139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i],
2140 GNUNET_i2s (&peer_id));
2141 }
2142#endif
2143 return p;
2144}
2145
2146
2147/**
2148 * Adds a path to the peer_infos of all the peers in the path
2149 *
2150 * @param p Path to process.
2151 * @param confirmed Whether we know if the path works or not.
2152 */
2153static void
2154path_add_to_peers (struct MeshPeerPath *p, int confirmed)
2155{
2156 unsigned int i;
2157
2158 /* TODO: invert and add */
2159 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2160 for (i++; i < p->length; i++)
2161 {
2162 struct MeshPeer *aux;
2163 struct MeshPeerPath *copy;
2164
2165 aux = peer_get_short (p->peers[i]);
2166 copy = path_duplicate (p);
2167 copy->length = i + 1;
2168 peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2169 }
2170}
2171
2172
2173/**
2174 * Search for a tunnel among the incoming tunnels
2175 *
2176 * @param tid the local id of the tunnel
2177 *
2178 * @return tunnel handler, NULL if doesn't exist
2179 */
2180static struct MeshTunnel *
2181tunnel_get_incoming (MESH_TunnelNumber tid)
2182{
2183 GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV);
2184 return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid);
2185}
2186
2187
2188/**
2189 * Search for a tunnel among the tunnels for a client
2190 *
2191 * @param c the client whose tunnels to search in
2192 * @param tid the local id of the tunnel
2193 *
2194 * @return tunnel handler, NULL if doesn't exist
2195 */
2196static struct MeshTunnel *
2197tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
2198{
2199 if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2200 {
2201 GNUNET_break_op (0);
2202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TID %X not a local tid\n", tid);
2203 return NULL;
2204 }
2205 if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
2206 {
2207 return tunnel_get_incoming (tid);
2208 }
2209 else
2210 {
2211 return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid);
2212 }
2213}
2214
2215
2216/**
2217 * Search for a tunnel by global ID using PEER_ID
2218 *
2219 * @param pi owner of the tunnel
2220 * @param tid global tunnel number
2221 *
2222 * @return tunnel handler, NULL if doesn't exist
2223 */
2224static struct MeshTunnel *
2225tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
2226{
2227 struct MESH_TunnelID id;
2228 struct GNUNET_HashCode hash;
2229
2230 id.oid = pi;
2231 id.tid = tid;
2232
2233 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
2234 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
2235}
2236
2237
2238/**
2239 * Search for a tunnel by global ID using full PeerIdentities
2240 *
2241 * @param oid owner of the tunnel
2242 * @param tid global tunnel number
2243 *
2244 * @return tunnel handler, NULL if doesn't exist
2245 */
2246static struct MeshTunnel *
2247tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
2248{
2249 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
2250}
2251
2252
2253/**
2254 * Change the tunnel state.
2255 *
2256 * @param t Tunnel whose ttate to change.
2257 * @param state New state.
2258 */
2259static void
2260tunnel_change_state (struct MeshTunnel *t, enum MeshTunnelState state)
2261{
2262 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2263 "Tunnel %s[%X] state was %s\n",
2264 GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid,
2265 GNUNET_MESH_DEBUG_S2S (t->state));
2266 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2267 "Tunnel %s[%X] state is now %s\n",
2268 GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid,
2269 GNUNET_MESH_DEBUG_S2S (state));
2270 t->state = state;
2271}
2272
2273
2274
2275/**
2276 * Add a client to a tunnel, initializing all needed data structures.
2277 *
2278 * @param t Tunnel to which add the client.
2279 * @param c Client which to add to the tunnel.
2280 */
2281static void
2282tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c)
2283{
2284 if (NULL != t->client)
2285 {
2286 GNUNET_break(0);
2287 return;
2288 }
2289 if (GNUNET_OK !=
2290 GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels,
2291 t->local_tid_dest, t,
2292 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2293 {
2294 GNUNET_break (0);
2295 return;
2296 }
2297 if (GNUNET_OK !=
2298 GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels,
2299 t->local_tid_dest, t,
2300 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
2301 {
2302 GNUNET_break (0);
2303 return;
2304 }
2305 t->client = c;
2306}
2307
2308
2309static void
2310tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p)
2311{
2312 unsigned int own_pos;
2313
2314 for (own_pos = 0; own_pos < p->length; own_pos++)
2315 {
2316 if (p->peers[own_pos] == myid)
2317 break;
2318 }
2319 if (own_pos > p->length - 1)
2320 {
2321 GNUNET_break (0);
2322 return;
2323 }
2324
2325 if (own_pos < p->length - 1)
2326 t->next_hop = p->peers[own_pos + 1];
2327 else
2328 t->next_hop = p->peers[own_pos];
2329 GNUNET_PEER_change_rc (t->next_hop, 1);
2330 if (0 < own_pos)
2331 t->prev_hop = p->peers[own_pos - 1];
2332 else
2333 t->prev_hop = p->peers[0];
2334 GNUNET_PEER_change_rc (t->prev_hop, 1);
2335
2336 if (NULL != t->path)
2337 path_destroy (t->path);
2338 t->path = path_duplicate (p);
2339 if (0 == own_pos)
2340 {
2341 if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task)
2342 GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task);
2343 t->fwd_maintenance_task =
2344 GNUNET_SCHEDULER_add_delayed (refresh_path_time,
2345 &tunnel_fwd_keepalive, t);
2346 }
2347}
2348
2349
2350/**
2351 * Notifies a tunnel that a connection has broken that affects at least
2352 * some of its peers. Sends a notification towards the root of the tree.
2353 * In case the peer is the owner of the tree, notifies the client that owns
2354 * the tunnel and tries to reconnect.
2355 *
2356 * @param t Tunnel affected.
2357 * @param p1 Peer that got disconnected from p2.
2358 * @param p2 Peer that got disconnected from p1.
2359 *
2360 * @return Short ID of the peer disconnected (either p1 or p2).
2361 * 0 if the tunnel remained unaffected.
2362 */
2363static GNUNET_PEER_Id
2364tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1,
2365 GNUNET_PEER_Id p2)
2366{
2367// if (myid != p1 && myid != p2) FIXME
2368// {
2369// return;
2370// }
2371//
2372// if (tree_get_predecessor (t->tree) != 0)
2373// {
2374// /* We are the peer still connected, notify owner of the disconnection. */
2375// struct GNUNET_MESH_PathBroken msg;
2376// struct GNUNET_PeerIdentity neighbor;
2377//
2378// msg.header.size = htons (sizeof (msg));
2379// msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN);
2380// GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2381// msg.tid = htonl (t->id.tid);
2382// msg.peer1 = my_full_id;
2383// GNUNET_PEER_resolve (pid, &msg.peer2);
2384// GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor);
2385// send_prebuilt_message (&msg.header, &neighbor, t);
2386// }
2387 return 0;
2388}
2389
2390
2391/**
2392 * Send an end-to-end FWD ACK message for the most recent in-sequence payload.
2393 *
2394 * @param t Tunnel this is about.
2395 * @param fwd Is for FWD traffic? (ACK dest->owner)
2396 */
2397static void
2398tunnel_send_data_ack (struct MeshTunnel *t, int fwd)
2399{
2400 struct GNUNET_MESH_DataACK msg;
2401 struct MeshTunnelReliability *rel;
2402 struct MeshReliableMessage *copy;
2403 GNUNET_PEER_Id hop;
2404 uint64_t mask;
2405 unsigned int delta;
2406
2407 rel = fwd ? t->bck_rel : t->fwd_rel;
2408 hop = fwd ? t->prev_hop : t->next_hop;
2409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2410 "send_data_ack for %u\n",
2411 rel->mid_recv - 1);
2412
2413 if (GNUNET_NO == t->reliable)
2414 {
2415 GNUNET_break_op (0);
2416 return;
2417 }
2418 msg.header.type = htons (fwd ? GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK :
2419 GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK);
2420 msg.header.size = htons (sizeof (msg));
2421 msg.tid = htonl (t->id.tid);
2422 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
2423 msg.mid = htonl (rel->mid_recv - 1);
2424 msg.futures = 0;
2425 for (copy = rel->head_recv; NULL != copy; copy = copy->next)
2426 {
2427 delta = copy->mid - rel->mid_recv;
2428 if (63 < delta)
2429 break;
2430 mask = 0x1LL << delta;
2431 msg.futures |= mask;
2432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2433 " setting bit for %u (delta %u) (%llX) -> %llX\n",
2434 copy->mid, delta, mask, msg.futures);
2435 }
2436 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures);
2437
2438 send_prebuilt_message (&msg.header, hop, t);
2439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n");
2440}
2441
2442
2443/**
2444 * Send an ACK informing the predecessor about the available buffer space.
2445 * In case there is no predecessor, inform the owning client.
2446 * If buffering is off, send only on behalf of children or self if endpoint.
2447 * If buffering is on, send when sent to children and buffer space is free.
2448 * Note that although the name is fwd_ack, the FWD mean forward *traffic*,
2449 * the ACK itself goes "back" (towards root).
2450 *
2451 * @param t Tunnel on which to send the ACK.
2452 * @param type Type of message that triggered the ACK transmission.
2453 * @param fwd Is this FWD ACK? (Going dest->owner)
2454 */
2455static void
2456tunnel_send_ack (struct MeshTunnel *t, uint16_t type, int fwd)
2457{
2458 struct MeshTunnelReliability *rel;
2459 struct MeshFlowControl *next_fc;
2460 struct MeshFlowControl *prev_fc;
2461 struct MeshClient *c;
2462 struct MeshClient *o;
2463 GNUNET_PEER_Id hop;
2464 uint32_t delta_mid;
2465 uint32_t ack;
2466 int delta;
2467
2468 rel = fwd ? t->fwd_rel : t->bck_rel;
2469 c = fwd ? t->client : t->owner;
2470 o = fwd ? t->owner : t->client;
2471 next_fc = fwd ? &t->next_fc : &t->prev_fc;
2472 prev_fc = fwd ? &t->prev_fc : &t->next_fc;
2473 hop = fwd ? t->prev_hop : t->next_hop;
2474
2475 switch (type)
2476 {
2477 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
2478 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
2479 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2480 "ACK due to %s\n",
2481 GNUNET_MESH_DEBUG_M2S (type));
2482 if (GNUNET_YES == t->nobuffer && (GNUNET_NO == t->reliable || NULL == c))
2483 {
2484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n");
2485 return;
2486 }
2487 if (GNUNET_YES == t->reliable && NULL != c)
2488 tunnel_send_data_ack (t, fwd);
2489 break;
2490 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
2491 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
2492 case GNUNET_MESSAGE_TYPE_MESH_ACK:
2493 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
2494 break;
2495 case GNUNET_MESSAGE_TYPE_MESH_POLL:
2496 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
2497 t->force_ack = GNUNET_YES;
2498 break;
2499 default:
2500 GNUNET_break (0);
2501 }
2502
2503 /* Check if we need to transmit the ACK */
2504 if (NULL == o &&
2505 prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3 &&
2506 GNUNET_NO == t->force_ack)
2507 {
2508 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n");
2509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2510 " last pid recv: %u, last ack sent: %u\n",
2511 prev_fc->last_pid_recv, prev_fc->last_ack_sent);
2512 return;
2513 }
2514
2515 /* Ok, ACK might be necessary, what PID to ACK? */
2516 delta = t->queue_max - next_fc->queue_n;
2517 if (NULL != o && GNUNET_YES == t->reliable && NULL != rel->head_sent)
2518 delta_mid = rel->mid_sent - rel->head_sent->mid;
2519 else
2520 delta_mid = 0;
2521 if (0 > delta || (GNUNET_YES == t->reliable &&
2522 NULL != o &&
2523 (10 < rel->n_sent || 64 <= delta_mid)))
2524 delta = 0;
2525 if (NULL != o && delta > 1)
2526 delta = 1;
2527 ack = prev_fc->last_pid_recv + delta;
2528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
2529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2530 " last pid %u, last ack %u, qmax %u, q %u\n",
2531 prev_fc->last_pid_recv, prev_fc->last_ack_sent,
2532 t->queue_max, next_fc->queue_n);
2533 if (ack == prev_fc->last_ack_sent && GNUNET_NO == t->force_ack)
2534 {
2535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n");
2536 return;
2537 }
2538
2539 prev_fc->last_ack_sent = ack;
2540 if (NULL != o)
2541 send_local_ack (t, o, fwd);
2542 else if (0 != hop)
2543 send_ack (t, hop, ack);
2544 else
2545 GNUNET_break (GNUNET_YES == t->destroy);
2546 t->force_ack = GNUNET_NO;
2547}
2548
2549
2550/**
2551 * Modify the mesh message TID from global to local and send to client.
2552 *
2553 * @param t Tunnel on which to send the message.
2554 * @param msg Message to modify and send.
2555 * @param c Client to send to.
2556 * @param tid Tunnel ID to use (c can be both owner and client).
2557 */
2558static void
2559tunnel_send_client_to_tid (struct MeshTunnel *t,
2560 const struct GNUNET_MESH_Data *msg,
2561 struct MeshClient *c, MESH_TunnelNumber tid)
2562{
2563 struct GNUNET_MESH_LocalData *copy;
2564 uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data);
2565 char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)];
2566
2567 if (size < sizeof (struct GNUNET_MessageHeader))
2568 {
2569 GNUNET_break_op (0);
2570 return;
2571 }
2572 if (NULL == c)
2573 {
2574 GNUNET_break (0);
2575 return;
2576 }
2577 copy = (struct GNUNET_MESH_LocalData *) cbuf;
2578 memcpy (&copy[1], &msg[1], size);
2579 copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size);
2580 copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
2581 copy->tid = htonl (tid);
2582 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
2583 &copy->header, GNUNET_NO);
2584}
2585
2586/**
2587 * Modify the unicast message TID from global to local and send to client.
2588 *
2589 * @param t Tunnel on which to send the message.
2590 * @param msg Message to modify and send.
2591 * @param fwd Forward?
2592 */
2593static void
2594tunnel_send_client_data (struct MeshTunnel *t,
2595 const struct GNUNET_MESH_Data *msg,
2596 int fwd)
2597{
2598 if (fwd)
2599 tunnel_send_client_to_tid (t, msg, t->client, t->local_tid_dest);
2600 else
2601 tunnel_send_client_to_tid (t, msg, t->owner, t->local_tid);
2602}
2603
2604
2605/**
2606 * Send up to 64 buffered messages to the client for in order delivery.
2607 *
2608 * @param t Tunnel on which to empty the message buffer.
2609 * @param c Client to send to.
2610 * @param rel Reliability structure to corresponding peer.
2611 * If rel == t->bck_rel, this is FWD data.
2612 */
2613static void
2614tunnel_send_client_buffered_data (struct MeshTunnel *t, struct MeshClient *c,
2615 struct MeshTunnelReliability *rel)
2616{
2617 ;
2618 struct MeshReliableMessage *copy;
2619 struct MeshReliableMessage *next;
2620
2621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n");
2622 for (copy = rel->head_recv; NULL != copy; copy = next)
2623 {
2624 next = copy->next;
2625 if (copy->mid == rel->mid_recv)
2626 {
2627 struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) &copy[1];
2628
2629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2630 " have %u! now expecting %u\n",
2631 copy->mid, rel->mid_recv + 1);
2632 tunnel_send_client_data (t, msg, (rel == t->bck_rel));
2633 rel->mid_recv++;
2634 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
2635 GNUNET_free (copy);
2636 }
2637 else
2638 {
2639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2640 " don't have %u, next is %u\n",
2641 rel->mid_recv,
2642 copy->mid);
2643 return;
2644 }
2645 }
2646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n");
2647}
2648
2649
2650/**
2651 * We have received a message out of order, buffer it until we receive
2652 * the missing one and we can feed the rest to the client.
2653 *
2654 * @param t Tunnel to add to.
2655 * @param msg Message to buffer.
2656 * @param rel Reliability data to the corresponding direction.
2657 */
2658static void
2659tunnel_add_buffered_data (struct MeshTunnel *t,
2660 const struct GNUNET_MESH_Data *msg,
2661 struct MeshTunnelReliability *rel)
2662{
2663 struct MeshReliableMessage *copy;
2664 struct MeshReliableMessage *prev;
2665 uint32_t mid;
2666 uint16_t size;
2667
2668 size = ntohs (msg->header.size);
2669 mid = ntohl (msg->mid);
2670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid);
2671
2672 copy = GNUNET_malloc (sizeof (*copy) + size);
2673 copy->mid = mid;
2674 copy->rel = rel;
2675 memcpy (&copy[1], msg, size);
2676
2677 // FIXME do something better than O(n), although n < 64...
2678 // FIXME start from the end (most messages are the latest ones)
2679 for (prev = rel->head_recv; NULL != prev; prev = prev->next)
2680 {
2681 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid);
2682 if (GMC_is_pid_bigger (prev->mid, mid))
2683 {
2684 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n");
2685 GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv,
2686 prev, copy);
2687 return;
2688 }
2689 }
2690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n");
2691 GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy);
2692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n");
2693}
2694
2695
2696/**
2697 * Destroy a reliable message after it has been acknowledged, either by
2698 * direct mid ACK or bitfield. Updates the appropriate data structures and
2699 * timers and frees all memory.
2700 *
2701 * @param copy Message that is no longer needed: remote peer got it.
2702 */
2703static void
2704tunnel_free_reliable_message (struct MeshReliableMessage *copy)
2705{
2706 struct MeshTunnelReliability *rel;
2707 struct GNUNET_TIME_Relative time;
2708
2709 rel = copy->rel;
2710 time = GNUNET_TIME_absolute_get_duration (copy->timestamp);
2711 rel->expected_delay.rel_value_us *= 7;
2712 rel->expected_delay.rel_value_us += time.rel_value_us;
2713 rel->expected_delay.rel_value_us /= 8;
2714 rel->n_sent--;
2715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid);
2716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
2717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n",
2718 GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO));
2719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n",
2720 GNUNET_STRINGS_relative_time_to_string (rel->expected_delay,
2721 GNUNET_NO));
2722 rel->retry_timer = rel->expected_delay;
2723 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
2724 GNUNET_free (copy);
2725}
2726
2727
2728/**
2729 * Destroy all reliable messages queued for a tunnel,
2730 * during a tunnel destruction.
2731 * Frees the reliability structure itself.
2732 *
2733 * @param rel Reliability data for a tunnel.
2734 */
2735static void
2736tunnel_free_reliable_all (struct MeshTunnelReliability *rel)
2737{
2738 struct MeshReliableMessage *copy;
2739 struct MeshReliableMessage *next;
2740
2741 if (NULL == rel)
2742 return;
2743
2744 for (copy = rel->head_recv; NULL != copy; copy = next)
2745 {
2746 next = copy->next;
2747 GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy);
2748 GNUNET_free (copy);
2749 }
2750 for (copy = rel->head_sent; NULL != copy; copy = next)
2751 {
2752 next = copy->next;
2753 GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy);
2754 GNUNET_free (copy);
2755 }
2756 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
2757 GNUNET_SCHEDULER_cancel (rel->retry_task);
2758 GNUNET_free (rel);
2759}
2760
2761
2762/**
2763 * Mark future messages as ACK'd.
2764 *
2765 * @param t Tunnel whose sent buffer to clean.
2766 * @param msg DataACK message with a bitfield of future ACK'd messages.
2767 * @param rel Reliability data.
2768 */
2769static void
2770tunnel_free_sent_reliable (struct MeshTunnel *t,
2771 const struct GNUNET_MESH_DataACK *msg,
2772 struct MeshTunnelReliability *rel)
2773{
2774 struct MeshReliableMessage *copy;
2775 struct MeshReliableMessage *next;
2776 uint64_t bitfield;
2777 uint64_t mask;
2778 uint32_t mid;
2779 uint32_t target;
2780 unsigned int i;
2781
2782 bitfield = msg->futures;
2783 mid = ntohl (msg->mid);
2784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2785 "free_sent_reliable %u %llX\n",
2786 mid, bitfield);
2787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2788 " rel %p, head %p\n",
2789 rel, rel->head_sent);
2790 for (i = 0, copy = rel->head_sent;
2791 i < 64 && NULL != copy && 0 != bitfield;
2792 i++)
2793 {
2794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2795 " trying bit %u (mid %u)\n",
2796 i, mid + i + 1);
2797 mask = 0x1LL << i;
2798 if (0 == (bitfield & mask))
2799 continue;
2800
2801 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n");
2802 /* Bit was set, clear the bit from the bitfield */
2803 bitfield &= ~mask;
2804
2805 /* The i-th bit was set. Do we have that copy? */
2806 /* Skip copies with mid < target */
2807 target = mid + i + 1;
2808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target);
2809 while (NULL != copy && GMC_is_pid_bigger (target, copy->mid))
2810 copy = copy->next;
2811
2812 /* Did we run out of copies? (previously freed, it's ok) */
2813 if (NULL == copy)
2814 {
2815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n");
2816 return;
2817 }
2818
2819 /* Did we overshoot the target? (previously freed, it's ok) */
2820 if (GMC_is_pid_bigger (copy->mid, target))
2821 {
2822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid);
2823 continue;
2824 }
2825
2826 /* Now copy->mid == target, free it */
2827 next = copy->next;
2828 tunnel_free_reliable_message (copy);
2829 copy = next;
2830 }
2831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n");
2832}
2833
2834
2835/**
2836 * We haven't received an ACK after a certain time: restransmit the message.
2837 *
2838 * @param cls Closure (MeshReliableMessage with the message to restransmit)
2839 * @param tc TaskContext.
2840 */
2841static void
2842tunnel_retransmit_message (void *cls,
2843 const struct GNUNET_SCHEDULER_TaskContext *tc)
2844{
2845 struct MeshTunnelReliability *rel = cls;
2846 struct MeshReliableMessage *copy;
2847 struct MeshFlowControl *fc;
2848 struct MeshPeerQueue *q;
2849 struct MeshPeer *pi;
2850 struct MeshTunnel *t;
2851 struct GNUNET_MESH_Data *payload;
2852 GNUNET_PEER_Id hop;
2853
2854 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
2855 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
2856 return;
2857
2858 t = rel->t;
2859 copy = rel->head_sent;
2860 if (NULL == copy)
2861 {
2862 GNUNET_break (0);
2863 return;
2864 }
2865
2866 /* Search the message to be retransmitted in the outgoing queue */
2867 payload = (struct GNUNET_MESH_Data *) &copy[1];
2868 hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop;
2869 fc = rel == t->fwd_rel ? &t->prev_fc : &t->next_fc;
2870 pi = peer_get_short (hop);
2871 for (q = pi->queue_head; NULL != q; q = q->next)
2872 {
2873 if (ntohs (payload->header.type) == q->type)
2874 {
2875 struct GNUNET_MESH_Data *queued_data = q->cls;
2876
2877 if (queued_data->mid == payload->mid)
2878 break;
2879 }
2880 }
2881
2882 /* Message not found in the queue */
2883 if (NULL == q)
2884 {
2885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid);
2886
2887 fc->last_ack_sent++;
2888 fc->last_pid_recv++;
2889 payload->pid = htonl (fc->last_pid_recv);
2890 send_prebuilt_message (&payload->header, hop, t);
2891 GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO);
2892 }
2893 else
2894 {
2895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL IN QUEUE %u\n", copy->mid);
2896 }
2897
2898 rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer);
2899 rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
2900 &tunnel_retransmit_message,
2901 cls);
2902}
2903
2904
2905/**
2906 * Send keepalive packets for a tunnel.
2907 *
2908 * @param t Tunnel to keep alive..
2909 * @param fwd Is this a FWD keepalive? (owner -> dest).
2910 */
2911static void
2912tunnel_keepalive (struct MeshTunnel *t, int fwd)
2913{
2914 struct GNUNET_MESH_TunnelKeepAlive *msg;
2915 size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive);
2916 char cbuf[size];
2917 GNUNET_PEER_Id hop;
2918 uint16_t type;
2919
2920 type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE :
2921 GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE;
2922 hop = fwd ? t->next_hop : t->prev_hop;
2923
2924 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2925 "sending %s keepalive for tunnel %d\n",
2926 fwd ? "FWD" : "BCK", t->id.tid);
2927
2928 msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf;
2929 msg->header.size = htons (size);
2930 msg->header.type = htons (type);
2931 msg->oid = *(GNUNET_PEER_resolve2 (t->id.oid));
2932 msg->tid = htonl (t->id.tid);
2933 send_prebuilt_message (&msg->header, hop, t);
2934}
2935
2936
2937/**
2938 * Send create (PATH_CREATE/PATH_ACK) packets for a tunnel.
2939 *
2940 * @param t Tunnel for which to send the message.
2941 * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK.
2942 */
2943static void
2944tunnel_recreate (struct MeshTunnel *t, int fwd)
2945{
2946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2947 "sending path recreate for tunnel %s[%X]\n",
2948 GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
2949 if (fwd)
2950 send_path_create (t);
2951 else
2952 send_path_ack (t);
2953}
2954
2955
2956/**
2957 * Generic tunnel timer management.
2958 * Depending on the role of the peer in the tunnel will send the
2959 * appropriate message (build or keepalive)
2960 *
2961 * @param t Tunnel to maintain.
2962 * @param fwd Is FWD?
2963 */
2964static void
2965tunnel_maintain (struct MeshTunnel *t, int fwd)
2966{
2967 switch (t->state)
2968 {
2969 case MESH_TUNNEL_NEW:
2970 GNUNET_break (0);
2971 case MESH_TUNNEL_SEARCHING:
2972 /* TODO DHT GET with RO_BART */
2973 break;
2974 case MESH_TUNNEL_WAITING:
2975 tunnel_recreate (t, fwd);
2976 break;
2977 case MESH_TUNNEL_READY:
2978 tunnel_keepalive (t, fwd);
2979 break;
2980 default:
2981 break;
2982 }
2983}
2984
2985
2986static void
2987tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2988{
2989 struct MeshTunnel *t = cls;
2990
2991 t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
2992 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
2993 NULL == t->owner)
2994 return;
2995
2996 tunnel_maintain (t, GNUNET_YES);
2997 t->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
2998 &tunnel_fwd_keepalive,
2999 t);
3000}
3001
3002
3003static void
3004tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3005{
3006 struct MeshTunnel *t = cls;
3007
3008 t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3009 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) ||
3010 NULL == t->client)
3011 return;
3012
3013 tunnel_keepalive (t, GNUNET_NO);
3014 t->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time,
3015 &tunnel_bck_keepalive,
3016 t);
3017}
3018
3019
3020/**
3021 * Send a message to all peers and clients in this tunnel that the tunnel
3022 * is no longer valid. If some peer or client should not receive the message,
3023 * should be zero'ed out before calling this function.
3024 *
3025 * @param t The tunnel whose peers and clients to notify.
3026 */
3027static void
3028tunnel_send_destroy (struct MeshTunnel *t)
3029{
3030 struct GNUNET_MESH_TunnelDestroy msg;
3031 struct GNUNET_PeerIdentity id;
3032
3033 msg.header.size = htons (sizeof (msg));
3034 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY);
3035 GNUNET_PEER_resolve (t->id.oid, &msg.oid);
3036 msg.tid = htonl (t->id.tid);
3037 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3038 " sending tunnel destroy for tunnel: %s [%X]\n",
3039 GNUNET_i2s (&msg.oid), t->id.tid);
3040
3041 if (NULL == t->client && 0 != t->next_hop)
3042 {
3043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop);
3044 GNUNET_PEER_resolve (t->next_hop, &id);
3045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3046 " sending forward to %s\n",
3047 GNUNET_i2s (&id));
3048 send_prebuilt_message (&msg.header, t->next_hop, t);
3049 }
3050 if (NULL == t->owner && 0 != t->prev_hop)
3051 {
3052 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop);
3053 GNUNET_PEER_resolve (t->prev_hop, &id);
3054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3055 " sending back to %s\n",
3056 GNUNET_i2s (&id));
3057 send_prebuilt_message (&msg.header, t->prev_hop, t);
3058 }
3059 if (NULL != t->owner)
3060 {
3061 send_local_tunnel_destroy (t, GNUNET_NO);
3062 }
3063 if (NULL != t->client)
3064 {
3065 send_local_tunnel_destroy (t, GNUNET_YES);
3066 }
3067}
3068
3069static int
3070tunnel_destroy (struct MeshTunnel *t)
3071{
3072 struct MeshClient *c;
3073 struct GNUNET_HashCode hash;
3074 int r;
3075
3076 if (NULL == t)
3077 return GNUNET_OK;
3078
3079 r = GNUNET_OK;
3080 c = t->owner;
3081
3082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n",
3083 GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
3084 if (NULL != c)
3085 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
3086
3087 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3088 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
3089 {
3090 GNUNET_break (0);
3091 r = GNUNET_SYSERR;
3092 }
3093
3094 if (NULL != c)
3095 {
3096 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels,
3097 t->local_tid, t))
3098 {
3099 GNUNET_break (0);
3100 r = GNUNET_SYSERR;
3101 }
3102 }
3103
3104 c = t->client;
3105 if (NULL != c)
3106 {
3107 if (GNUNET_YES !=
3108 GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels,
3109 t->local_tid_dest, t))
3110 {
3111 GNUNET_break (0);
3112 r = GNUNET_SYSERR;
3113 }
3114 if (GNUNET_YES !=
3115 GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels,
3116 t->local_tid_dest, t))
3117 {
3118 GNUNET_break (0);
3119 r = GNUNET_SYSERR;
3120 }
3121 }
3122
3123 if(GNUNET_YES == t->reliable)
3124 {
3125 tunnel_free_reliable_all (t->fwd_rel);
3126 tunnel_free_reliable_all (t->bck_rel);
3127 }
3128 if (0 != t->prev_hop)
3129 {
3130 peer_cancel_queues (t->prev_hop, t);
3131 GNUNET_PEER_change_rc (t->prev_hop, -1);
3132 }
3133 if (0 != t->next_hop)
3134 {
3135 peer_cancel_queues (t->next_hop, t);
3136 GNUNET_PEER_change_rc (t->next_hop, -1);
3137 }
3138 if (GNUNET_SCHEDULER_NO_TASK != t->next_fc.poll_task)
3139 {
3140 GNUNET_SCHEDULER_cancel (t->next_fc.poll_task);
3141 t->next_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3142 }
3143 if (GNUNET_SCHEDULER_NO_TASK != t->prev_fc.poll_task)
3144 {
3145 GNUNET_SCHEDULER_cancel (t->prev_fc.poll_task);
3146 t->prev_fc.poll_task = GNUNET_SCHEDULER_NO_TASK;
3147 }
3148 if (0 != t->dest) {
3149 peer_remove_tunnel (peer_get_short (t->dest), t);
3150 }
3151
3152 if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task)
3153 GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task);
3154 if (GNUNET_SCHEDULER_NO_TASK != t->bck_maintenance_task)
3155 GNUNET_SCHEDULER_cancel (t->bck_maintenance_task);
3156
3157 n_tunnels--;
3158 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
3159 path_destroy (t->path);
3160 GNUNET_free (t);
3161 return r;
3162}
3163
3164/**
3165 * Tunnel is empty: destroy it.
3166 *
3167 * Notifies all participants (peers, cleints) about the destruction.
3168 *
3169 * @param t Tunnel to destroy.
3170 */
3171static void
3172tunnel_destroy_empty (struct MeshTunnel *t)
3173{
3174 #if MESH_DEBUG
3175 {
3176 struct GNUNET_PeerIdentity id;
3177
3178 GNUNET_PEER_resolve (t->id.oid, &id);
3179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3180 "executing destruction of empty tunnel %s [%X]\n",
3181 GNUNET_i2s (&id), t->id.tid);
3182 }
3183 #endif
3184
3185 if (GNUNET_NO == t->destroy)
3186 tunnel_send_destroy (t);
3187 if (0 == t->pending_messages)
3188 tunnel_destroy (t);
3189 else
3190 t->destroy = GNUNET_YES;
3191}
3192
3193/**
3194 * Initialize a Flow Control structure to the initial state.
3195 *
3196 * @param fc Flow Control structure to initialize.
3197 */
3198static void
3199fc_init (struct MeshFlowControl *fc)
3200{
3201 fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */
3202 fc->last_pid_recv = (uint32_t) -1;
3203 fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */
3204 fc->last_ack_recv = (uint32_t) -1;
3205 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
3206 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
3207 fc->queue_n = 0;
3208}
3209
3210/**
3211 * Create a new tunnel
3212 *
3213 * @param owner Who is the owner of the tunnel (short ID).
3214 * @param tid Tunnel Number of the tunnel.
3215 * @param client Clients that owns the tunnel, NULL for foreign tunnels.
3216 * @param local Tunnel Number for the tunnel, for the client point of view.
3217 *
3218 * @return A new initialized tunnel. NULL on error.
3219 */
3220static struct MeshTunnel *
3221tunnel_new (GNUNET_PEER_Id owner,
3222 MESH_TunnelNumber tid,
3223 struct MeshClient *client,
3224 MESH_TunnelNumber local)
3225{
3226 struct MeshTunnel *t;
3227 struct GNUNET_HashCode hash;
3228
3229 if (n_tunnels >= max_tunnels && NULL == client)
3230 return NULL;
3231
3232 t = GNUNET_malloc (sizeof (struct MeshTunnel));
3233 t->id.oid = owner;
3234 t->id.tid = tid;
3235 t->queue_max = (max_msgs_queue / max_tunnels) + 1;
3236 t->owner = client;
3237 fc_init (&t->next_fc);
3238 fc_init (&t->prev_fc);
3239 t->next_fc.t = t;
3240 t->prev_fc.t = t;
3241 t->local_tid = local;
3242 n_tunnels++;
3243 GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO);
3244
3245 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
3246 if (GNUNET_OK !=
3247 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
3248 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3249 {
3250 GNUNET_break (0);
3251 tunnel_destroy (t);
3252 if (NULL != client)
3253 {
3254 GNUNET_break (0);
3255 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
3256 }
3257 return NULL;
3258 }
3259
3260 if (NULL != client)
3261 {
3262 if (GNUNET_OK !=
3263 GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels,
3264 t->local_tid, t,
3265 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
3266 {
3267 tunnel_destroy (t);
3268 GNUNET_break (0);
3269 GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR);
3270 return NULL;
3271 }
3272 }
3273
3274 return t;
3275}
3276
3277
3278/**
3279 * Set options in a tunnel, extracted from a bit flag field
3280 *
3281 * @param t Tunnel to set options to.
3282 * @param options Bit array in host byte order.
3283 */
3284static void
3285tunnel_set_options (struct MeshTunnel *t, uint32_t options)
3286{
3287 t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ?
3288 GNUNET_YES : GNUNET_NO;
3289 t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ?
3290 GNUNET_YES : GNUNET_NO;
3291}
3292
3293
3294/**
3295 * Iterator for deleting each tunnel whose client endpoint disconnected.
3296 *
3297 * @param cls Closure (client that has disconnected).
3298 * @param key The local tunnel id (used to access the hashmap).
3299 * @param value The value stored at the key (tunnel to destroy).
3300 *
3301 * @return GNUNET_OK, keep iterating.
3302 */
3303static int
3304tunnel_destroy_iterator (void *cls,
3305 uint32_t key,
3306 void *value)
3307{
3308 struct MeshTunnel *t = value;
3309 struct MeshClient *c = cls;
3310
3311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3312 " Tunnel %X / %X destroy, due to client %u shutdown.\n",
3313 t->local_tid, t->local_tid_dest, c->id);
3314 client_delete_tunnel (c, t);
3315 if (c == t->client)
3316 {
3317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id);
3318 t->client = NULL;
3319 if (0 != t->next_hop) { /* destroy could come before a path is used */
3320 GNUNET_PEER_change_rc (t->next_hop, -1);
3321 t->next_hop = 0;
3322 }
3323 }
3324 if (c == t->owner)
3325 {
3326 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id);
3327 t->owner = NULL;
3328 if (0 != t->prev_hop) { /* destroy could come before a path is used */
3329 GNUNET_PEER_change_rc (t->prev_hop, -1);
3330 t->prev_hop = 0;
3331 }
3332 }
3333
3334 tunnel_destroy_empty (t);
3335
3336 return GNUNET_OK;
3337}
3338
3339
3340/**
3341 * remove client's ports from the global hashmap on diconnect.
3342 *
3343 * @param cls Closure (unused).
3344 * @param key Port.
3345 * @param value ThClient structure.
3346 *
3347 * @return GNUNET_OK, keep iterating.
3348 */
3349static int
3350client_release_ports (void *cls,
3351 uint32_t key,
3352 void *value)
3353{
3354 int res;
3355
3356 res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value);
3357 if (GNUNET_YES != res)
3358 {
3359 GNUNET_break (0);
3360 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3361 "Port %u by client %p was not registered.\n",
3362 key, value);
3363 }
3364 return GNUNET_OK;
3365}
3366
3367/**
3368 * Timeout function due to lack of keepalive/traffic from the owner.
3369 * Destroys tunnel if called.
3370 *
3371 * @param cls Closure (tunnel to destroy).
3372 * @param tc TaskContext
3373 */
3374static void
3375tunnel_fwd_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3376{
3377 struct MeshTunnel *t = cls;
3378
3379 t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3380 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3381 return;
3382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3383 "Tunnel %s [%X] FWD timed out. Destroying.\n",
3384 GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
3385 if (NULL != t->client)
3386 send_local_tunnel_destroy (t, GNUNET_YES);
3387 tunnel_destroy (t); /* Do not notify other */
3388}
3389
3390
3391/**
3392 * Timeout function due to lack of keepalive/traffic from the destination.
3393 * Destroys tunnel if called.
3394 *
3395 * @param cls Closure (tunnel to destroy).
3396 * @param tc TaskContext
3397 */
3398static void
3399tunnel_bck_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3400{
3401 struct MeshTunnel *t = cls;
3402
3403 t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK;
3404 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3405 return;
3406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3407 "Tunnel %s [%X] BCK timed out. Destroying.\n",
3408 GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid);
3409 if (NULL != t->owner)
3410 send_local_tunnel_destroy (t, GNUNET_NO);
3411 tunnel_destroy (t); /* Do not notify other */
3412}
3413
3414
3415/**
3416 * Resets the tunnel timeout task, some other message has done the task's job.
3417 * - For the first peer on the direction this means to send
3418 * a keepalive or a path confirmation message (either create or ACK).
3419 * - For all other peers, this means to destroy the tunnel,
3420 * due to lack of activity.
3421 * Starts the tiemout if no timeout was running (tunnel just created).
3422 *
3423 * @param t Tunnel whose timeout to reset.
3424 * @param fwd Is this forward?
3425 *
3426 * TODO use heap to improve efficiency of scheduler.
3427 */
3428static void
3429tunnel_reset_timeout (struct MeshTunnel *t, int fwd)
3430{
3431 GNUNET_SCHEDULER_TaskIdentifier *ti;
3432 GNUNET_SCHEDULER_Task f;
3433 struct MeshClient *c;
3434
3435 ti = fwd ? &t->fwd_maintenance_task : &t->bck_maintenance_task;
3436 c = fwd ? t->owner : t->client;
3437
3438 if (GNUNET_SCHEDULER_NO_TASK != *ti)
3439 GNUNET_SCHEDULER_cancel (*ti);
3440
3441 if (NULL != c)
3442 {
3443 f = fwd ? &tunnel_fwd_keepalive : &tunnel_bck_keepalive;
3444 *ti = GNUNET_SCHEDULER_add_delayed (refresh_path_time, f, t);
3445 }
3446 else
3447 {
3448 f = fwd ? &tunnel_fwd_timeout : &tunnel_bck_timeout;
3449 *ti = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply
3450 (refresh_path_time, 4),
3451 f, t);
3452 }
3453}
3454
3455
3456/******************************************************************************/
3457/**************** MESH NETWORK HANDLER HELPERS ***********************/
3458/******************************************************************************/
3459
3460/**
3461 * Free a transmission that was already queued with all resources
3462 * associated to the request.
3463 *
3464 * @param queue Queue handler to cancel.
3465 * @param clear_cls Is it necessary to free associated cls?
3466 */
3467static void
3468queue_destroy (struct MeshPeerQueue *queue, int clear_cls)
3469{
3470 struct MeshFlowControl *fc;
3471
3472 if (GNUNET_YES == clear_cls)
3473 {
3474 switch (queue->type)
3475 {
3476 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3477 GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n");
3478 GNUNET_break (GNUNET_YES == queue->tunnel->destroy);
3479 /* fall through */
3480 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3481 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3482 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3483 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3484 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3485 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3486 case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE:
3487 case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE:
3488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3489 " prebuilt message\n");
3490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3491 " type %s\n",
3492 GNUNET_MESH_DEBUG_M2S (queue->type));
3493 break;
3494 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n");
3496 break;
3497 default:
3498 GNUNET_break (0);
3499 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3500 " type %s unknown!\n",
3501 GNUNET_MESH_DEBUG_M2S (queue->type));
3502 }
3503 GNUNET_free_non_null (queue->cls);
3504 }
3505 GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head,
3506 queue->peer->queue_tail,
3507 queue);
3508
3509 /* Delete from appropriate fc in the tunnel */
3510 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type ||
3511 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type )
3512 {
3513 if (queue->peer->id == queue->tunnel->prev_hop)
3514 fc = &queue->tunnel->prev_fc;
3515 else if (queue->peer->id == queue->tunnel->next_hop)
3516 fc = &queue->tunnel->next_fc;
3517 else
3518 {
3519 GNUNET_break (0);
3520 GNUNET_free (queue);
3521 return;
3522 }
3523 fc->queue_n--;
3524 }
3525 GNUNET_free (queue);
3526}
3527
3528
3529/**
3530 * @brief Get the next transmittable message from the queue.
3531 *
3532 * This will be the head, except in the case of being a data packet
3533 * not allowed by the destination peer.
3534 *
3535 * @param peer Destination peer.
3536 *
3537 * @return The next viable MeshPeerQueue element to send to that peer.
3538 * NULL when there are no transmittable messages.
3539 */
3540struct MeshPeerQueue *
3541queue_get_next (const struct MeshPeer *peer)
3542{
3543 struct MeshPeerQueue *q;
3544
3545 struct GNUNET_MESH_Data *dmsg;
3546 struct MeshTunnel* t;
3547 uint32_t pid;
3548 uint32_t ack;
3549
3550 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n");
3551 for (q = peer->queue_head; NULL != q; q = q->next)
3552 {
3553 t = q->tunnel;
3554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3555 "* %s\n",
3556 GNUNET_MESH_DEBUG_M2S (q->type));
3557 dmsg = (struct GNUNET_MESH_Data *) q->cls;
3558 pid = ntohl (dmsg->pid);
3559 switch (q->type)
3560 {
3561 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3562 ack = t->next_fc.last_ack_recv;
3563 break;
3564 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3565 ack = t->prev_fc.last_ack_recv;
3566 break;
3567 default:
3568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3569 "* OK!\n");
3570 return q;
3571 }
3572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3573 "* ACK: %u, PID: %u, MID: %u\n",
3574 ack, pid, ntohl (dmsg->mid));
3575 if (GNUNET_NO == GMC_is_pid_bigger (pid, ack))
3576 {
3577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3578 "* OK!\n");
3579 return q;
3580 }
3581 else
3582 {
3583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3584 "* NEXT!\n");
3585 }
3586 }
3587 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3588 "* nothing found\n");
3589 return NULL;
3590}
3591
3592
3593static size_t
3594queue_send (void *cls, size_t size, void *buf)
3595{
3596 struct MeshPeer *peer = cls;
3597 struct GNUNET_MessageHeader *msg;
3598 struct MeshPeerQueue *queue;
3599 struct MeshTunnel *t;
3600 struct GNUNET_PeerIdentity dst_id;
3601 struct MeshFlowControl *fc;
3602 size_t data_size;
3603 uint32_t pid;
3604 uint16_t type;
3605
3606 peer->core_transmit = NULL;
3607
3608 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n");
3609
3610 if (NULL == buf || 0 == size)
3611 {
3612 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n");
3613 return 0;
3614 }
3615 queue = queue_get_next (peer);
3616
3617 /* Queue has no internal mesh traffic nor sendable payload */
3618 if (NULL == queue)
3619 {
3620 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n");
3621 if (NULL == peer->queue_head)
3622 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
3623 return 0;
3624 }
3625
3626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n");
3627
3628 GNUNET_PEER_resolve (peer->id, &dst_id);
3629 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3630 "* towards %s\n",
3631 GNUNET_i2s (&dst_id));
3632 /* Check if buffer size is enough for the message */
3633 if (queue->size > size)
3634 {
3635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3636 "* not enough room, reissue\n");
3637 peer->core_transmit =
3638 GNUNET_CORE_notify_transmit_ready (core_handle,
3639 GNUNET_NO,
3640 0,
3641 GNUNET_TIME_UNIT_FOREVER_REL,
3642 &dst_id,
3643 queue->size,
3644 &queue_send,
3645 peer);
3646 return 0;
3647 }
3648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n");
3649
3650 t = queue->tunnel;
3651 GNUNET_assert (0 < t->pending_messages);
3652 t->pending_messages--;
3653 type = 0;
3654
3655 /* Fill buf */
3656 switch (queue->type)
3657 {
3658 case 0:
3659 case GNUNET_MESSAGE_TYPE_MESH_ACK:
3660 case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK:
3661 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK:
3662 case GNUNET_MESSAGE_TYPE_MESH_POLL:
3663 case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN:
3664 case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY:
3665 case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY:
3666 case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE:
3667 case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE:
3668 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3669 "* raw: %s\n",
3670 GNUNET_MESH_DEBUG_M2S (queue->type));
3671 /* Fall through */
3672 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3673 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3674 data_size = send_core_data_raw (queue->cls, size, buf);
3675 msg = (struct GNUNET_MessageHeader *) buf;
3676 type = ntohs (msg->type);
3677 break;
3678 case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE:
3679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n");
3680 data_size = send_core_path_create (queue->cls, size, buf);
3681 break;
3682 case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK:
3683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n");
3684 data_size = send_core_path_ack (queue->cls, size, buf);
3685 break;
3686 default:
3687 GNUNET_break (0);
3688 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3689 "* type unknown: %u\n",
3690 queue->type);
3691 data_size = 0;
3692 }
3693
3694 if (0 < drop_percent &&
3695 GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
3696 {
3697 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3698 "Dropping message of type %s\n",
3699 GNUNET_MESH_DEBUG_M2S(queue->type));
3700 data_size = 0;
3701 }
3702 /* Free queue, but cls was freed by send_core_* */
3703 queue_destroy (queue, GNUNET_NO);
3704
3705 /* Send ACK if needed, after accounting for sent ID in fc->queue_n */
3706 pid = ((struct GNUNET_MESH_Data *) buf)->pid;
3707 pid = ntohl (pid);
3708 switch (type)
3709 {
3710 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
3711 t->next_fc.last_pid_sent = pid;
3712 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST, GNUNET_YES);
3713 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3714 "!!! FWD %u\n",
3715 ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) );
3716 break;
3717 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
3718 t->prev_fc.last_pid_sent = pid;
3719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3720 "!!! BCK %u\n",
3721 ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) );
3722 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, GNUNET_NO);
3723 break;
3724 default:
3725 break;
3726 }
3727
3728 /* If more data in queue, send next */
3729 queue = queue_get_next (peer);
3730 if (NULL != queue)
3731 {
3732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n");
3733 if (NULL == peer->core_transmit) {
3734 peer->core_transmit =
3735 GNUNET_CORE_notify_transmit_ready(core_handle,
3736 0,
3737 0,
3738 GNUNET_TIME_UNIT_FOREVER_REL,
3739 &dst_id,
3740 queue->size,
3741 &queue_send,
3742 peer);
3743 }
3744 else
3745 {
3746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3747 "* tmt rdy called somewhere else\n");
3748 }
3749 }
3750 if (peer->id == t->next_hop)
3751 fc = &t->next_fc;
3752 else if (peer->id == t->prev_hop)
3753 fc = &t->prev_fc;
3754 else
3755 {
3756 GNUNET_break (0);
3757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "id: %u, next: %u, prev: %u\n",
3758 peer->id, t->next_hop, t->prev_hop);
3759 return data_size;
3760 }
3761 if (NULL != peer->queue_head)
3762 {
3763 if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task && fc->queue_n > 0)
3764 {
3765 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3766 "* %s starting poll timeout\n",
3767 GNUNET_i2s (&my_full_id));
3768 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3769 &tunnel_poll, fc);
3770 }
3771 }
3772 else
3773 {
3774 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task)
3775 {
3776 GNUNET_SCHEDULER_cancel (fc->poll_task);
3777 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
3778 }
3779 }
3780 if (GNUNET_YES == t->destroy && 0 == t->pending_messages)
3781 {
3782 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n");
3783 tunnel_destroy (t);
3784 }
3785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size);
3786 return data_size;
3787}
3788
3789
3790/**
3791 * @brief Queue and pass message to core when possible.
3792 *
3793 * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and
3794 * accounts for it. In case the queue is full, the message is dropped and
3795 * a break issued.
3796 *
3797 * Otherwise, message is treated as internal and allowed to go regardless of
3798 * queue status.
3799 *
3800 * @param cls Closure (@c type dependant). It will be used by queue_send to
3801 * build the message to be sent if not already prebuilt.
3802 * @param type Type of the message, 0 for a raw message.
3803 * @param size Size of the message.
3804 * @param dst Neighbor to send message to.
3805 * @param t Tunnel this message belongs to.
3806 */
3807static void
3808queue_add (void *cls, uint16_t type, size_t size,
3809 struct MeshPeer *dst, struct MeshTunnel *t)
3810{
3811 struct MeshPeerQueue *queue;
3812 struct MeshFlowControl *fc;
3813 int priority;
3814
3815 fc = NULL;
3816 priority = GNUNET_NO;
3817 if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type)
3818 {
3819 fc = &t->next_fc;
3820 }
3821 else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)
3822 {
3823 fc = &t->prev_fc;
3824 }
3825 if (NULL != fc)
3826 {
3827 if (fc->queue_n >= t->queue_max)
3828 {
3829 /* If this isn't a retransmission, drop the message */
3830 if (GNUNET_NO == t->reliable ||
3831 (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) ||
3832 (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type))
3833 {
3834 GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)",
3835 1, GNUNET_NO);
3836 GNUNET_break (0);
3837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3838 "queue full: %u/%u\n",
3839 fc->queue_n, t->queue_max);
3840 return; /* Drop this message */
3841 }
3842 priority = GNUNET_YES;
3843 }
3844 fc->queue_n++;
3845 if (GMC_is_pid_bigger(fc->last_pid_sent + 1, fc->last_ack_recv) &&
3846 GNUNET_SCHEDULER_NO_TASK == fc->poll_task)
3847 fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time,
3848 &tunnel_poll,
3849 fc);
3850 }
3851 queue = GNUNET_malloc (sizeof (struct MeshPeerQueue));
3852 queue->cls = cls;
3853 queue->type = type;
3854 queue->size = size;
3855 queue->peer = dst;
3856 queue->tunnel = t;
3857 if (GNUNET_YES == priority)
3858 {
3859 struct GNUNET_MESH_Data *d;
3860 uint32_t prev;
3861 uint32_t next;
3862
3863 GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue);
3864 d = (struct GNUNET_MESH_Data *) queue->cls;
3865 prev = d->pid;
3866 for (queue = dst->queue_tail; NULL != queue; queue = queue->prev)
3867 {
3868 if (queue->type != type)
3869 continue;
3870 d = (struct GNUNET_MESH_Data *) queue->cls;
3871 next = d->pid;
3872 d->pid = prev;
3873 prev = next;
3874 }
3875 }
3876 else
3877 GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue);
3878
3879 if (NULL == dst->core_transmit)
3880 {
3881 dst->core_transmit =
3882 GNUNET_CORE_notify_transmit_ready (core_handle,
3883 0,
3884 0,
3885 GNUNET_TIME_UNIT_FOREVER_REL,
3886 GNUNET_PEER_resolve2 (dst->id),
3887 size,
3888 &queue_send,
3889 dst);
3890 }
3891 t->pending_messages++;
3892}
3893
3894
3895/******************************************************************************/
3896/******************** MESH NETWORK HANDLERS **************************/
3897/******************************************************************************/
3898
3899
3900/**
3901 * Core handler for path creation
3902 *
3903 * @param cls closure
3904 * @param message message
3905 * @param peer peer identity this notification is about
3906 *
3907 * @return GNUNET_OK to keep the connection open,
3908 * GNUNET_SYSERR to close it (signal serious error)
3909 */
3910static int
3911handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
3912 const struct GNUNET_MessageHeader *message)
3913{
3914 unsigned int own_pos;
3915 uint16_t size;
3916 uint16_t i;
3917 MESH_TunnelNumber tid;
3918 struct GNUNET_MESH_CreateTunnel *msg;
3919 struct GNUNET_PeerIdentity *pi;
3920 struct MeshPeerPath *path;
3921 struct MeshPeer *dest_peer_info;
3922 struct MeshPeer *orig_peer_info;
3923 struct MeshTunnel *t;
3924
3925 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3926 "Received a path create msg [%s]\n",
3927 GNUNET_i2s (&my_full_id));
3928 size = ntohs (message->size);
3929 if (size < sizeof (struct GNUNET_MESH_CreateTunnel))
3930 {
3931 GNUNET_break_op (0);
3932 return GNUNET_OK;
3933 }
3934
3935 size -= sizeof (struct GNUNET_MESH_CreateTunnel);
3936 if (size % sizeof (struct GNUNET_PeerIdentity))
3937 {
3938 GNUNET_break_op (0);
3939 return GNUNET_OK;
3940 }
3941 size /= sizeof (struct GNUNET_PeerIdentity);
3942 if (size < 1)
3943 {
3944 GNUNET_break_op (0);
3945 return GNUNET_OK;
3946 }
3947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size);
3948 msg = (struct GNUNET_MESH_CreateTunnel *) message;
3949
3950 tid = ntohl (msg->tid);
3951 pi = (struct GNUNET_PeerIdentity *) &msg[1];
3952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3953 " path is for tunnel %s[%X]:%u.\n",
3954 GNUNET_i2s (pi), tid, ntohl (msg->port));
3955 t = tunnel_get (pi, tid);
3956 if (NULL == t) /* might be a local tunnel */
3957 {
3958 uint32_t opt;
3959
3960 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n");
3961 t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0);
3962 if (NULL == t)
3963 {
3964 GNUNET_break (0);
3965 return GNUNET_OK;
3966 }
3967 t->port = ntohl (msg->port);
3968 opt = ntohl (msg->opt);
3969 if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER))
3970 {
3971 t->nobuffer = GNUNET_YES;
3972 t->queue_max = 1;
3973 }
3974 if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE))
3975 {
3976 t->reliable = GNUNET_YES;
3977 }
3978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer);
3979 }
3980 tunnel_reset_timeout (t, GNUNET_YES);
3981 tunnel_change_state (t, MESH_TUNNEL_WAITING);
3982 dest_peer_info =
3983 GNUNET_CONTAINER_multipeermap_get (peers, &pi[size - 1]);
3984 if (NULL == dest_peer_info)
3985 {
3986 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3987 " Creating PeerInfo for destination.\n");
3988 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeer));
3989 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
3990 GNUNET_CONTAINER_multipeermap_put (peers, &pi[size - 1],
3991 dest_peer_info,
3992 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
3993 }
3994 orig_peer_info = GNUNET_CONTAINER_multipeermap_get (peers, pi);
3995 if (NULL == orig_peer_info)
3996 {
3997 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3998 " Creating PeerInfo for origin.\n");
3999 orig_peer_info = GNUNET_new (struct MeshPeer);
4000 orig_peer_info->id = GNUNET_PEER_intern (pi);
4001 GNUNET_CONTAINER_multipeermap_put (peers, pi, orig_peer_info,
4002 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
4003 }
4004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n");
4005 path = path_new (size);
4006 own_pos = 0;
4007 for (i = 0; i < size; i++)
4008 {
4009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n",
4010 GNUNET_i2s (&pi[i]));
4011 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
4012 if (path->peers[i] == myid)
4013 own_pos = i;
4014 }
4015 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos);
4016 if (own_pos == 0 && path->peers[own_pos] != myid)
4017 {
4018 /* create path: self not found in path through self */
4019 GNUNET_break_op (0);
4020 path_destroy (path);
4021 tunnel_destroy (t);
4022 return GNUNET_OK;
4023 }
4024 path_add_to_peers (path, GNUNET_NO);
4025 tunnel_use_path (t, path);
4026
4027 peer_add_tunnel (dest_peer_info, t);
4028
4029 if (own_pos == size - 1)
4030 {
4031 struct MeshClient *c;
4032
4033 /* Find target client */
4034 c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port);
4035 if (NULL == c)
4036 {
4037 /* TODO send reject */
4038 return GNUNET_OK;
4039 }
4040
4041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
4042 peer_add_path_to_origin (orig_peer_info, path, GNUNET_YES);
4043 /* This can be a retransmission due to a lost PATH ACK.
4044 * Check if we already have a destination client for the tunnel. */
4045 if (t->client != c)
4046 {
4047 /* Assign local tid */
4048 while (NULL != tunnel_get_incoming (next_local_tid))
4049 next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4050 t->local_tid_dest = next_local_tid++;
4051 next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
4052
4053 if (GNUNET_YES == t->reliable)
4054 {
4055 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
4056 t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
4057 t->bck_rel->t = t;
4058 t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME;
4059 }
4060
4061 tunnel_add_client (t, c);
4062 send_local_tunnel_create (t);
4063 }
4064 send_path_ack (t);
4065 /* Eliminate tunnel when origin dies */
4066 tunnel_reset_timeout (t, GNUNET_YES);
4067 /* Keep tunnel alive in direction dest->owner*/
4068 tunnel_reset_timeout (t, GNUNET_NO);
4069 }
4070 else
4071 {
4072 struct MeshPeerPath *path2;
4073
4074 t->next_hop = path->peers[own_pos + 1];
4075 GNUNET_PEER_change_rc(t->next_hop, 1);
4076
4077 /* It's for somebody else! Retransmit. */
4078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n");
4079 path2 = path_duplicate (path);
4080 peer_add_path (dest_peer_info, path2, GNUNET_NO);
4081 peer_add_path_to_origin (orig_peer_info, path, GNUNET_NO);
4082 send_path_create (t);
4083 }
4084 return GNUNET_OK;
4085}
4086
4087
4088
4089/**
4090 * Core handler for path ACKs
4091 *
4092 * @param cls closure
4093 * @param message message
4094 * @param peer peer identity this notification is about
4095 *
4096 * @return GNUNET_OK to keep the connection open,
4097 * GNUNET_SYSERR to close it (signal serious error)
4098 */
4099static int
4100handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4101 const struct GNUNET_MessageHeader *message)
4102{
4103 struct GNUNET_MESH_PathACK *msg;
4104 struct MeshPeer *peer_info;
4105 struct MeshPeerPath *p;
4106 struct MeshTunnel *t;
4107
4108 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n",
4109 GNUNET_i2s (&my_full_id));
4110 msg = (struct GNUNET_MESH_PathACK *) message;
4111 t = tunnel_get (&msg->oid, ntohl(msg->tid));
4112 if (NULL == t)
4113 {
4114 /* TODO notify that we don't know the tunnel */
4115 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO);
4116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n",
4117 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
4118 return GNUNET_OK;
4119 }
4120 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n",
4121 GNUNET_i2s (&msg->oid), ntohl(msg->tid));
4122
4123 peer_info = peer_get (&msg->peer_id);
4124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n",
4125 GNUNET_i2s (&msg->peer_id));
4126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n",
4127 GNUNET_i2s (peer));
4128
4129 /* Add path to peers? */
4130 p = t->path;
4131 if (NULL != p)
4132 {
4133 path_add_to_peers (p, GNUNET_YES);
4134 }
4135 else
4136 {
4137 GNUNET_break (0);
4138 }
4139 tunnel_change_state (t, MESH_TUNNEL_READY);
4140 tunnel_reset_timeout (t, GNUNET_NO);
4141 t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0;
4142 t->prev_fc.last_ack_sent = ntohl (msg->ack);
4143
4144 /* Message for us? */
4145 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
4146 {
4147 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n");
4148 if (NULL == t->owner)
4149 {
4150 GNUNET_break_op (0);
4151 return GNUNET_OK;
4152 }
4153 if (NULL != peer_info->dhtget)
4154 {
4155 GNUNET_DHT_get_stop (peer_info->dhtget);
4156 peer_info->dhtget = NULL;
4157 }
4158 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_YES);
4159 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_NO);
4160 return GNUNET_OK;
4161 }
4162
4163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4164 " not for us, retransmitting...\n");
4165 send_prebuilt_message (message, t->prev_hop, t);
4166 return GNUNET_OK;
4167}
4168
4169
4170/**
4171 * Core handler for notifications of broken paths
4172 *
4173 * @param cls closure
4174 * @param message message
4175 * @param peer peer identity this notification is about
4176 *
4177 * @return GNUNET_OK to keep the connection open,
4178 * GNUNET_SYSERR to close it (signal serious error)
4179 */
4180static int
4181handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer,
4182 const struct GNUNET_MessageHeader *message)
4183{
4184 struct GNUNET_MESH_PathBroken *msg;
4185 struct MeshTunnel *t;
4186
4187 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4188 "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer));
4189 msg = (struct GNUNET_MESH_PathBroken *) message;
4190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
4191 GNUNET_i2s (&msg->peer1));
4192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n",
4193 GNUNET_i2s (&msg->peer2));
4194 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4195 if (NULL == t)
4196 {
4197 GNUNET_break_op (0);
4198 return GNUNET_OK;
4199 }
4200 tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1),
4201 GNUNET_PEER_search (&msg->peer2));
4202 return GNUNET_OK;
4203
4204}
4205
4206
4207/**
4208 * Core handler for tunnel destruction
4209 *
4210 * @param cls closure
4211 * @param message message
4212 * @param peer peer identity this notification is about
4213 *
4214 * @return GNUNET_OK to keep the connection open,
4215 * GNUNET_SYSERR to close it (signal serious error)
4216 */
4217static int
4218handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer,
4219 const struct GNUNET_MessageHeader *message)
4220{
4221 struct GNUNET_MESH_TunnelDestroy *msg;
4222 struct MeshTunnel *t;
4223
4224 msg = (struct GNUNET_MESH_TunnelDestroy *) message;
4225 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4226 "Got a TUNNEL DESTROY packet from %s\n",
4227 GNUNET_i2s (peer));
4228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4229 " for tunnel %s [%u]\n",
4230 GNUNET_i2s (&msg->oid), ntohl (msg->tid));
4231 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4232 if (NULL == t)
4233 {
4234 /* Probably already got the message from another path,
4235 * destroyed the tunnel and retransmitted to children.
4236 * Safe to ignore.
4237 */
4238 GNUNET_STATISTICS_update (stats, "# control on unknown tunnel",
4239 1, GNUNET_NO);
4240 return GNUNET_OK;
4241 }
4242 if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
4243 {
4244 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n",
4245 t->local_tid, t->local_tid_dest);
4246 }
4247 if (GNUNET_PEER_search (peer) == t->prev_hop)
4248 {
4249 // TODO check owner's signature
4250 // TODO add owner's signatue to tunnel for retransmission
4251 peer_cancel_queues (t->prev_hop, t);
4252 GNUNET_PEER_change_rc (t->prev_hop, -1);
4253 t->prev_hop = 0;
4254 }
4255 else if (GNUNET_PEER_search (peer) == t->next_hop)
4256 {
4257 // TODO check dest's signature
4258 // TODO add dest's signatue to tunnel for retransmission
4259 peer_cancel_queues (t->next_hop, t);
4260 GNUNET_PEER_change_rc (t->next_hop, -1);
4261 t->next_hop = 0;
4262 }
4263 else
4264 {
4265 GNUNET_break_op (0);
4266 // TODO check both owner AND destination's signature to see which matches
4267 // TODO restransmit in appropriate direction
4268 return GNUNET_OK;
4269 }
4270 tunnel_destroy_empty (t);
4271
4272 // TODO: add timeout to destroy the tunnel anyway
4273 return GNUNET_OK;
4274}
4275
4276
4277/**
4278 * Generic handler for mesh network payload traffic.
4279 *
4280 * @param peer Peer identity this notification is about.
4281 * @param message Data message.
4282 * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO;
4283 *
4284 * @return GNUNET_OK to keep the connection open,
4285 * GNUNET_SYSERR to close it (signal serious error)
4286 */
4287static int
4288handle_mesh_data (const struct GNUNET_PeerIdentity *peer,
4289 const struct GNUNET_MessageHeader *message,
4290 int fwd)
4291{
4292 struct GNUNET_MESH_Data *msg;
4293 struct MeshFlowControl *fc;
4294 struct MeshTunnelReliability *rel;
4295 struct MeshTunnel *t;
4296 struct MeshClient *c;
4297 GNUNET_PEER_Id hop;
4298 uint32_t pid;
4299 uint32_t ttl;
4300 uint16_t type;
4301 size_t size;
4302
4303 /* Check size */
4304 size = ntohs (message->size);
4305 if (size <
4306 sizeof (struct GNUNET_MESH_Data) +
4307 sizeof (struct GNUNET_MessageHeader))
4308 {
4309 GNUNET_break (0);
4310 return GNUNET_OK;
4311 }
4312 type =ntohs (message->type);
4313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n",
4314 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
4315 msg = (struct GNUNET_MESH_Data *) message;
4316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
4317 GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type)));
4318 /* Check tunnel */
4319 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4320 if (NULL == t)
4321 {
4322 /* TODO notify back: we don't know this tunnel */
4323 GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO);
4324 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING tunnel unknown\n");
4325 return GNUNET_OK;
4326 }
4327
4328 /* Initialize FWD/BCK data */
4329 pid = ntohl (msg->pid);
4330 fc = fwd ? &t->prev_fc : &t->next_fc;
4331 c = fwd ? t->client : t->owner;
4332 rel = fwd ? t->bck_rel : t->fwd_rel;
4333 hop = fwd ? t->next_hop : t->prev_hop;
4334 if (GMC_is_pid_bigger (pid, fc->last_ack_sent))
4335 {
4336 GNUNET_STATISTICS_update (stats, "# unsolicited data", 1, GNUNET_NO);
4337 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4338 "WARNING Received PID %u, (prev %u), ACK %u\n",
4339 pid, fc->last_pid_recv, fc->last_ack_sent);
4340 return GNUNET_OK;
4341 }
4342 if (NULL != c)
4343 tunnel_change_state (t, MESH_TUNNEL_READY);
4344 tunnel_reset_timeout (t, fwd);
4345 if (NULL != c)
4346 {
4347 /* TODO signature verification */
4348 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to client\n");
4349 GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO);
4350 if (GMC_is_pid_bigger (pid, fc->last_pid_recv))
4351 {
4352 uint32_t mid;
4353
4354 mid = ntohl (msg->mid);
4355 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4356 " pid %u (mid %u) not seen yet\n", pid, mid);
4357 fc->last_pid_recv = pid;
4358
4359 if (GNUNET_NO == t->reliable ||
4360 ( !GMC_is_pid_bigger (rel->mid_recv, mid) &&
4361 GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) )
4362 {
4363 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4364 "!!! RECV %u\n", ntohl (msg->mid));
4365 if (GNUNET_YES == t->reliable)
4366 {
4367 /* Is this the exact next expected messasge? */
4368 if (mid == rel->mid_recv)
4369 {
4370 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n");
4371 rel->mid_recv++;
4372 tunnel_send_client_data (t, msg, fwd);
4373 tunnel_send_client_buffered_data (t, c, rel);
4374 }
4375 else
4376 {
4377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n");
4378 tunnel_add_buffered_data (t, msg, rel);
4379 }
4380 }
4381 else /* Tunnel unreliable, send to clients directly */
4382 {
4383 tunnel_send_client_data (t, msg, fwd);
4384 }
4385 }
4386 else
4387 {
4388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4389 " MID %u not expected (%u - %u), dropping!\n",
4390 ntohl (msg->mid), rel->mid_recv, rel->mid_recv + 64);
4391 }
4392 }
4393 else
4394 {
4395// GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO);
4396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
4397 " Pid %u not expected (%u+), dropping!\n",
4398 pid, fc->last_pid_recv + 1);
4399 }
4400 tunnel_send_ack (t, type, fwd);
4401 return GNUNET_OK;
4402 }
4403 fc->last_pid_recv = pid;
4404 if (0 == hop)
4405 {
4406 GNUNET_STATISTICS_update (stats, "# data on dying tunnel", 1, GNUNET_NO);
4407 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "data on dying tunnel %s[%X]\n",
4408 GNUNET_PEER_resolve2 (t->id.oid), ntohl (msg->tid));
4409 return GNUNET_OK; /* Next hop has destoyed the tunnel, drop */
4410 }
4411 ttl = ntohl (msg->ttl);
4412 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl);
4413 if (ttl == 0)
4414 {
4415 GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO);
4416 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n");
4417 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, fwd);
4418 return GNUNET_OK;
4419 }
4420
4421 if (myid != hop)
4422 {
4423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n");
4424 send_prebuilt_message (message, hop, t);
4425 GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO);
4426 }
4427 return GNUNET_OK;
4428}
4429
4430
4431/**
4432 * Core handler for mesh network traffic going from the origin to a peer
4433 *
4434 * @param cls Closure (unused).
4435 * @param message Message received.
4436 * @param peer Peer who sent the message.
4437 *
4438 * @return GNUNET_OK to keep the connection open,
4439 * GNUNET_SYSERR to close it (signal serious error)
4440 */
4441static int
4442handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
4443 const struct GNUNET_MessageHeader *message)
4444{
4445 return handle_mesh_data (peer, message, GNUNET_YES);
4446}
4447
4448/**
4449 * Core handler for mesh network traffic towards the owner of a tunnel.
4450 *
4451 * @param cls Closure (unused).
4452 * @param message Message received.
4453 * @param peer Peer who sent the message.
4454 *
4455 * @return GNUNET_OK to keep the connection open,
4456 * GNUNET_SYSERR to close it (signal serious error)
4457 */
4458static int
4459handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
4460 const struct GNUNET_MessageHeader *message)
4461{
4462 return handle_mesh_data (peer, message, GNUNET_NO);
4463}
4464
4465
4466/**
4467 * Core handler for mesh network traffic end-to-end ACKs.
4468 *
4469 * @param cls Closure.
4470 * @param message Message.
4471 * @param peer Peer identity this notification is about.
4472 *
4473 * @return GNUNET_OK to keep the connection open,
4474 * GNUNET_SYSERR to close it (signal serious error)
4475 */
4476static int
4477handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4478 const struct GNUNET_MessageHeader *message)
4479{
4480 struct GNUNET_MESH_DataACK *msg;
4481 struct MeshTunnelReliability *rel;
4482 struct MeshReliableMessage *copy;
4483 struct MeshReliableMessage *next;
4484 struct MeshTunnel *t;
4485 GNUNET_PEER_Id id;
4486 uint32_t ack;
4487 uint16_t type;
4488 int work;
4489
4490 type = ntohs (message->type);
4491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n",
4492 GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer));
4493 msg = (struct GNUNET_MESH_DataACK *) message;
4494
4495 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4496 if (NULL == t)
4497 {
4498 /* TODO notify that we dont know this tunnel (whom)? */
4499 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4500 return GNUNET_OK;
4501 }
4502 ack = ntohl (msg->mid);
4503 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4504
4505 /* Is this a forward or backward ACK? */
4506 id = GNUNET_PEER_search (peer);
4507 if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type)
4508 {
4509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4510 if (NULL == t->owner)
4511 {
4512 send_prebuilt_message (message, t->prev_hop, t);
4513 return GNUNET_OK;
4514 }
4515 rel = t->fwd_rel;
4516 }
4517 else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type)
4518 {
4519 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4520 if (NULL == t->client)
4521 {
4522 send_prebuilt_message (message, t->next_hop, t);
4523 return GNUNET_OK;
4524 }
4525 rel = t->bck_rel;
4526 }
4527 else
4528 {
4529 GNUNET_break_op (0);
4530 return GNUNET_OK;
4531 }
4532
4533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %u\n", ack);
4534 for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next)
4535 {
4536 if (GMC_is_pid_bigger (copy->mid, ack))
4537 {
4538 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid);
4539 tunnel_free_sent_reliable (t, msg, rel);
4540 break;
4541 }
4542 work = GNUNET_YES;
4543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid);
4544 next = copy->next;
4545 tunnel_free_reliable_message (copy);
4546 }
4547 /* Once buffers have been free'd, send ACK */
4548 tunnel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type);
4549
4550 /* If some message was free'd, update the retransmission delay*/
4551 if (GNUNET_YES == work)
4552 {
4553 if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task)
4554 {
4555 GNUNET_SCHEDULER_cancel (rel->retry_task);
4556 if (NULL == rel->head_sent)
4557 {
4558 rel->retry_task = GNUNET_SCHEDULER_NO_TASK;
4559 }
4560 else
4561 {
4562 struct GNUNET_TIME_Absolute new_target;
4563 struct GNUNET_TIME_Relative delay;
4564
4565 delay = GNUNET_TIME_relative_multiply (rel->retry_timer,
4566 MESH_RETRANSMIT_MARGIN);
4567 new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp,
4568 delay);
4569 delay = GNUNET_TIME_absolute_get_remaining (new_target);
4570 rel->retry_task =
4571 GNUNET_SCHEDULER_add_delayed (delay,
4572 &tunnel_retransmit_message,
4573 rel);
4574 }
4575 }
4576 else
4577 GNUNET_break (0);
4578 }
4579 return GNUNET_OK;
4580}
4581
4582/**
4583 * Core handler for mesh network traffic point-to-point acks.
4584 *
4585 * @param cls closure
4586 * @param message message
4587 * @param peer peer identity this notification is about
4588 *
4589 * @return GNUNET_OK to keep the connection open,
4590 * GNUNET_SYSERR to close it (signal serious error)
4591 */
4592static int
4593handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
4594 const struct GNUNET_MessageHeader *message)
4595{
4596 struct GNUNET_MESH_ACK *msg;
4597 struct MeshTunnel *t;
4598 struct MeshFlowControl *fc;
4599 GNUNET_PEER_Id id;
4600 uint32_t ack;
4601
4602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n",
4603 GNUNET_i2s (peer));
4604 msg = (struct GNUNET_MESH_ACK *) message;
4605
4606 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4607
4608 if (NULL == t)
4609 {
4610 /* TODO notify that we dont know this tunnel (whom)? */
4611 GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO);
4612 return GNUNET_OK;
4613 }
4614 ack = ntohl (msg->pid);
4615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack);
4616
4617 /* Is this a forward or backward ACK? */
4618 id = GNUNET_PEER_search (peer);
4619 if (t->next_hop == id)
4620 {
4621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n");
4622 fc = &t->next_fc;
4623 }
4624 else if (t->prev_hop == id)
4625 {
4626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n");
4627 fc = &t->prev_fc;
4628 }
4629 else
4630 {
4631 GNUNET_break_op (0);
4632 return GNUNET_OK;
4633 }
4634
4635 if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task &&
4636 GMC_is_pid_bigger (ack, fc->last_ack_recv))
4637 {
4638 GNUNET_SCHEDULER_cancel (fc->poll_task);
4639 fc->poll_task = GNUNET_SCHEDULER_NO_TASK;
4640 fc->poll_time = GNUNET_TIME_UNIT_SECONDS;
4641 }
4642
4643 fc->last_ack_recv = ack;
4644 peer_unlock_queue (id);
4645 tunnel_change_state (t, MESH_TUNNEL_READY);
4646
4647 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, t->next_hop == id);
4648
4649 return GNUNET_OK;
4650}
4651
4652
4653/**
4654 * Core handler for mesh network traffic point-to-point ack polls.
4655 *
4656 * @param cls closure
4657 * @param message message
4658 * @param peer peer identity this notification is about
4659 *
4660 * @return GNUNET_OK to keep the connection open,
4661 * GNUNET_SYSERR to close it (signal serious error)
4662 */
4663static int
4664handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer,
4665 const struct GNUNET_MessageHeader *message)
4666{
4667 struct GNUNET_MESH_Poll *msg;
4668 struct MeshTunnel *t;
4669 struct MeshFlowControl *fc;
4670 GNUNET_PEER_Id id;
4671 uint32_t pid;
4672 uint32_t old;
4673
4674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n",
4675 GNUNET_i2s (peer));
4676
4677 msg = (struct GNUNET_MESH_Poll *) message;
4678
4679 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4680
4681 if (NULL == t)
4682 {
4683 /* TODO notify that we dont know this tunnel (whom)? */
4684 GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO);
4685 GNUNET_break_op (0);
4686 return GNUNET_OK;
4687 }
4688
4689 /* Is this a forward or backward ACK? */
4690 id = GNUNET_PEER_search (peer);
4691 pid = ntohl (msg->pid);
4692 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid);
4693 if (t->next_hop == id)
4694 {
4695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n");
4696 fc = &t->next_fc;
4697 old = fc->last_pid_recv;
4698 }
4699 else if (t->prev_hop == id)
4700 {
4701 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n");
4702 fc = &t->prev_fc;
4703 old = fc->last_pid_recv;
4704 }
4705 else
4706 {
4707 GNUNET_break (0);
4708 return GNUNET_OK;
4709 }
4710
4711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", fc->last_pid_recv);
4712 fc->last_pid_recv = pid;
4713 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL, t->prev_hop == id);
4714
4715 if (GNUNET_YES == t->reliable)
4716 fc->last_pid_recv = old;
4717
4718 return GNUNET_OK;
4719}
4720
4721
4722/**
4723 * Core handler for mesh keepalives.
4724 *
4725 * @param cls closure
4726 * @param message message
4727 * @param peer peer identity this notification is about
4728 * @return GNUNET_OK to keep the connection open,
4729 * GNUNET_SYSERR to close it (signal serious error)
4730 *
4731 * TODO: Check who we got this from, to validate route.
4732 */
4733static int
4734handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer,
4735 const struct GNUNET_MessageHeader *message)
4736{
4737 struct GNUNET_MESH_TunnelKeepAlive *msg;
4738 struct MeshTunnel *t;
4739 struct MeshClient *c;
4740 GNUNET_PEER_Id hop;
4741 int fwd;
4742
4743 msg = (struct GNUNET_MESH_TunnelKeepAlive *) message;
4744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n",
4745 GNUNET_i2s (peer));
4746
4747 t = tunnel_get (&msg->oid, ntohl (msg->tid));
4748 if (NULL == t)
4749 {
4750 /* TODO notify that we dont know that tunnel */
4751 GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1,
4752 GNUNET_NO);
4753 return GNUNET_OK;
4754 }
4755
4756 fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ?
4757 GNUNET_YES : GNUNET_NO;
4758 c = fwd ? t->client : t->owner;
4759 hop = fwd ? t->next_hop : t->prev_hop;
4760
4761 if (NULL != c)
4762 tunnel_change_state (t, MESH_TUNNEL_READY);
4763 tunnel_reset_timeout (t, fwd);
4764 if (NULL != c || 0 == hop || myid == hop)
4765 return GNUNET_OK;
4766
4767 GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO);
4768 send_prebuilt_message (message, hop, t);
4769 return GNUNET_OK;
4770 }
4771
4772
4773
4774/**
4775 * Functions to handle messages from core
4776 */
4777static struct GNUNET_CORE_MessageHandler core_handlers[] = {
4778 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
4779 {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN,
4780 sizeof (struct GNUNET_MESH_PathBroken)},
4781 {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY,
4782 sizeof (struct GNUNET_MESH_TunnelDestroy)},
4783 {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
4784 {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
4785 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK,
4786 sizeof (struct GNUNET_MESH_DataACK)},
4787 {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK,
4788 sizeof (struct GNUNET_MESH_DataACK)},
4789 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE,
4790 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4791 {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE,
4792 sizeof (struct GNUNET_MESH_TunnelKeepAlive)},
4793 {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK,
4794 sizeof (struct GNUNET_MESH_ACK)},
4795 {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL,
4796 sizeof (struct GNUNET_MESH_Poll)},
4797 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
4798 sizeof (struct GNUNET_MESH_PathACK)},
4799 {NULL, 0, 0}
4800};
4801
4802
4803/**
4804 * Function to process paths received for a new peer addition. The recorded
4805 * paths form the initial tunnel, which can be optimized later.
4806 * Called on each result obtained for the DHT search.
4807 *
4808 * @param cls closure
4809 * @param exp when will this value expire
4810 * @param key key of the result
4811 * @param get_path path of the get request
4812 * @param get_path_length lenght of get_path
4813 * @param put_path path of the put request
4814 * @param put_path_length length of the put_path
4815 * @param type type of the result
4816 * @param size number of bytes in data
4817 * @param data pointer to the result data
4818 */
4819static void
4820dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
4821 const struct GNUNET_HashCode * key,
4822 const struct GNUNET_PeerIdentity *get_path,
4823 unsigned int get_path_length,
4824 const struct GNUNET_PeerIdentity *put_path,
4825 unsigned int put_path_length, enum GNUNET_BLOCK_Type type,
4826 size_t size, const void *data)
4827{
4828 struct MeshPeer *peer = cls;
4829 struct MeshPeerPath *p;
4830 struct GNUNET_PeerIdentity pi;
4831 int i;
4832
4833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n");
4834 GNUNET_PEER_resolve (peer->id, &pi);
4835 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi));
4836
4837 p = path_build_from_dht (get_path, get_path_length,
4838 put_path, put_path_length);
4839 path_add_to_peers (p, GNUNET_NO);
4840 path_destroy (p);
4841 for (i = 0; i < peer->ntunnels; i++)
4842 {
4843 struct GNUNET_PeerIdentity id;
4844
4845 GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id);
4846 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n",
4847 GNUNET_i2s (&id), peer->tunnels[i]->id.tid,
4848 peer->tunnels[i]->local_tid,
4849 peer->tunnels[i]->local_tid_dest);
4850 if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING)
4851 {
4852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
4853 peer_connect (peer, peer->tunnels[i]);
4854 }
4855 }
4856
4857 return;
4858}
4859
4860
4861/******************************************************************************/
4862/********************* MESH LOCAL HANDLES **************************/
4863/******************************************************************************/
4864
4865
4866/**
4867 * Handler for client connection.
4868 *
4869 * @param cls Closure (unused).
4870 * @param client Client handler.
4871 */
4872static void
4873handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client)
4874{
4875 struct MeshClient *c;
4876
4877 if (NULL == client)
4878 return;
4879 c = GNUNET_malloc (sizeof (struct MeshClient));
4880 c->handle = client;
4881 GNUNET_SERVER_client_keep (client);
4882 GNUNET_SERVER_client_set_user_context (client, c);
4883 GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c);
4884}
4885
4886
4887/**
4888 * Handler for client disconnection
4889 *
4890 * @param cls closure
4891 * @param client identification of the client; NULL
4892 * for the last call when the server is destroyed
4893 */
4894static void
4895handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
4896{
4897 struct MeshClient *c;
4898
4899 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client);
4900 if (client == NULL)
4901 {
4902 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n");
4903 return;
4904 }
4905
4906 c = client_get (client);
4907 if (NULL != c)
4908 {
4909 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n",
4910 c->id, c);
4911 GNUNET_SERVER_client_drop (c->handle);
4912 c->shutting_down = GNUNET_YES;
4913 if (NULL != c->own_tunnels)
4914 {
4915 GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels,
4916 &tunnel_destroy_iterator, c);
4917 GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels);
4918 }
4919
4920 if (NULL != c->incoming_tunnels)
4921 {
4922 GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels,
4923 &tunnel_destroy_iterator, c);
4924 GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels);
4925 }
4926
4927 if (NULL != c->ports)
4928 {
4929 GNUNET_CONTAINER_multihashmap32_iterate (c->ports,
4930 &client_release_ports, c);
4931 GNUNET_CONTAINER_multihashmap32_destroy (c->ports);
4932 }
4933 GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c);
4934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c);
4935 GNUNET_free (c);
4936 GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO);
4937 }
4938 else
4939 {
4940 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n");
4941 }
4942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "done!\n");
4943 return;
4944}
4945
4946
4947/**
4948 * Handler for new clients
4949 *
4950 * @param cls closure
4951 * @param client identification of the client
4952 * @param message the actual message, which includes messages the client wants
4953 */
4954static void
4955handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
4956 const struct GNUNET_MessageHeader *message)
4957{
4958 struct GNUNET_MESH_ClientConnect *cc_msg;
4959 struct MeshClient *c;
4960 unsigned int size;
4961 uint32_t *p;
4962 unsigned int i;
4963
4964 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client);
4965
4966 /* Check data sanity */
4967 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
4968 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
4969 if (0 != (size % sizeof (uint32_t)))
4970 {
4971 GNUNET_break (0);
4972 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
4973 return;
4974 }
4975 size /= sizeof (uint32_t);
4976
4977 /* Initialize new client structure */
4978 c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient);
4979 c->id = next_client_id++; /* overflow not important: just for debug */
4980 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id);
4981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size);
4982 if (size > 0)
4983 {
4984 uint32_t u32;
4985
4986 p = (uint32_t *) &cc_msg[1];
4987 c->ports = GNUNET_CONTAINER_multihashmap32_create (size);
4988 for (i = 0; i < size; i++)
4989 {
4990 u32 = ntohl (p[i]);
4991 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32);
4992
4993 /* store in client's hashmap */
4994 GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c,
4995 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
4996 /* store in global hashmap */
4997 /* FIXME only allow one client to have the port open,
4998 * have a backup hashmap with waiting clients */
4999 GNUNET_CONTAINER_multihashmap32_put (ports, u32, c,
5000 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
5001 }
5002 }
5003
5004 c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5005 c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5006 GNUNET_SERVER_notification_context_add (nc, client);
5007 GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO);
5008
5009 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5010 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n");
5011}
5012
5013
5014/**
5015 * Handler for requests of new tunnels
5016 *
5017 * @param cls Closure.
5018 * @param client Identification of the client.
5019 * @param message The actual message.
5020 */
5021static void
5022handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
5023 const struct GNUNET_MessageHeader *message)
5024{
5025 struct GNUNET_MESH_TunnelMessage *t_msg;
5026 struct MeshPeer *peer_info;
5027 struct MeshTunnel *t;
5028 struct MeshClient *c;
5029 MESH_TunnelNumber tid;
5030
5031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n");
5032
5033 /* Sanity check for client registration */
5034 if (NULL == (c = client_get (client)))
5035 {
5036 GNUNET_break (0);
5037 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5038 return;
5039 }
5040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5041
5042 /* Message size sanity check */
5043 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
5044 {
5045 GNUNET_break (0);
5046 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5047 return;
5048 }
5049
5050 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
5051 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n",
5052 GNUNET_i2s (&t_msg->peer), ntohl (t_msg->port));
5053 tid = ntohl (t_msg->tunnel_id);
5054 /* Sanity check for duplicate tunnel IDs */
5055 if (NULL != tunnel_get_by_local_id (c, tid))
5056 {
5057 GNUNET_break (0);
5058 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5059 return;
5060 }
5061
5062 /* Create tunnel */
5063 while (NULL != tunnel_get_by_pi (myid, next_tid))
5064 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
5065 t = tunnel_new (myid, next_tid, c, tid);
5066 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
5067 if (NULL == t)
5068 {
5069 GNUNET_break (0);
5070 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5071 return;
5072 }
5073 t->port = ntohl (t_msg->port);
5074 tunnel_set_options (t, ntohl (t_msg->opt));
5075 if (GNUNET_YES == t->reliable)
5076 {
5077 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n");
5078 t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability));
5079 t->fwd_rel->t = t;
5080 t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME;
5081 }
5082
5083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n",
5084 GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid);
5085
5086 peer_info = peer_get (&t_msg->peer);
5087 peer_add_tunnel (peer_info, t);
5088 peer_connect (peer_info, t);
5089 tunnel_reset_timeout (t, GNUNET_YES);
5090 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5091 return;
5092}
5093
5094
5095/**
5096 * Handler for requests of deleting tunnels
5097 *
5098 * @param cls closure
5099 * @param client identification of the client
5100 * @param message the actual message
5101 */
5102static void
5103handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
5104 const struct GNUNET_MessageHeader *message)
5105{
5106 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
5107 struct MeshClient *c;
5108 struct MeshTunnel *t;
5109 MESH_TunnelNumber tid;
5110
5111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5112 "Got a DESTROY TUNNEL from client!\n");
5113
5114 /* Sanity check for client registration */
5115 if (NULL == (c = client_get (client)))
5116 {
5117 GNUNET_break (0);
5118 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5119 return;
5120 }
5121 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5122
5123 /* Message sanity check */
5124 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
5125 {
5126 GNUNET_break (0);
5127 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5128 return;
5129 }
5130
5131 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
5132
5133 /* Retrieve tunnel */
5134 tid = ntohl (tunnel_msg->tunnel_id);
5135 t = tunnel_get_by_local_id (c, tid);
5136 if (NULL == t)
5137 {
5138 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid);
5139 GNUNET_break (0);
5140 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5141 return;
5142 }
5143
5144 /* Cleanup after the tunnel */
5145 client_delete_tunnel (c, t);
5146 if (c == t->client && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV <= tid)
5147 {
5148 t->client = NULL;
5149 }
5150 else if (c == t->owner && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV > tid)
5151 {
5152 peer_remove_tunnel (peer_get_short (t->dest), t);
5153 t->owner = NULL;
5154 }
5155 else
5156 {
5157 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5158 " tunnel %X client %p (%p, %p)\n",
5159 tid, c, t->owner, t->client);
5160 GNUNET_break (0);
5161 }
5162
5163 /* The tunnel will be destroyed when the last message is transmitted. */
5164 tunnel_destroy_empty (t);
5165
5166 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5167 return;
5168}
5169
5170
5171/**
5172 * Handler for client traffic
5173 *
5174 * @param cls closure
5175 * @param client identification of the client
5176 * @param message the actual message
5177 */
5178static void
5179handle_local_data (void *cls, struct GNUNET_SERVER_Client *client,
5180 const struct GNUNET_MessageHeader *message)
5181{
5182 struct GNUNET_MESH_LocalData *data_msg;
5183 struct MeshClient *c;
5184 struct MeshTunnel *t;
5185 struct MeshFlowControl *fc;
5186 MESH_TunnelNumber tid;
5187 size_t size;
5188
5189 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5190 "Got data from a client!\n");
5191
5192 /* Sanity check for client registration */
5193 if (NULL == (c = client_get (client)))
5194 {
5195 GNUNET_break (0);
5196 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5197 return;
5198 }
5199 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5200
5201 data_msg = (struct GNUNET_MESH_LocalData *) message;
5202
5203 /* Sanity check for message size */
5204 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData);
5205 if (size < sizeof (struct GNUNET_MessageHeader))
5206 {
5207 GNUNET_break (0);
5208 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5209 return;
5210 }
5211
5212 /* Tunnel exists? */
5213 tid = ntohl (data_msg->tid);
5214 t = tunnel_get_by_local_id (c, tid);
5215 if (NULL == t)
5216 {
5217 GNUNET_break (0);
5218 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5219 return;
5220 }
5221
5222 /* Is the client in the tunnel? */
5223 if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
5224 t->owner &&
5225 t->owner->handle == client)
5226 ||
5227 (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV &&
5228 t->client &&
5229 t->client->handle == client) ) )
5230 {
5231 GNUNET_break (0);
5232 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5233 return;
5234 }
5235
5236 /* Ok, everything is correct, send the message
5237 * (pretend we got it from a mesh peer)
5238 */
5239 {
5240 struct GNUNET_MESH_Data *payload;
5241 char cbuf[sizeof(struct GNUNET_MESH_Data) + size];
5242
5243 fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc;
5244 if (GNUNET_YES == t->reliable)
5245 {
5246 struct MeshTunnelReliability *rel;
5247 struct MeshReliableMessage *copy;
5248
5249 rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel;
5250 copy = GNUNET_malloc (sizeof (struct MeshReliableMessage)
5251 + sizeof(struct GNUNET_MESH_Data)
5252 + size);
5253 copy->mid = rel->mid_sent++;
5254 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->mid);
5255 copy->timestamp = GNUNET_TIME_absolute_get ();
5256 copy->rel = rel;
5257 rel->n_sent++;
5258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent);
5259 GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy);
5260 if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task)
5261 {
5262 rel->retry_timer =
5263 GNUNET_TIME_relative_multiply (rel->expected_delay,
5264 MESH_RETRANSMIT_MARGIN);
5265 rel->retry_task =
5266 GNUNET_SCHEDULER_add_delayed (rel->retry_timer,
5267 &tunnel_retransmit_message,
5268 rel);
5269 }
5270 payload = (struct GNUNET_MESH_Data *) &copy[1];
5271 payload->mid = htonl (copy->mid);
5272 }
5273 else
5274 {
5275 payload = (struct GNUNET_MESH_Data *) cbuf;
5276 payload->mid = htonl (fc->last_pid_recv + 1);
5277 }
5278 memcpy (&payload[1], &data_msg[1], size);
5279 payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size);
5280 payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ?
5281 GNUNET_MESSAGE_TYPE_MESH_UNICAST :
5282 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
5283 GNUNET_PEER_resolve(t->id.oid, &payload->oid);;
5284 payload->tid = htonl (t->id.tid);
5285 payload->ttl = htonl (default_ttl);
5286 payload->pid = htonl (fc->last_pid_recv + 1);
5287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
5288 " calling generic handler...\n");
5289 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
5290 handle_mesh_unicast (NULL, &my_full_id, &payload->header);
5291 else
5292 handle_mesh_to_orig (NULL, &my_full_id, &payload->header);
5293 }
5294 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n");
5295 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5296
5297 return;
5298}
5299
5300
5301/**
5302 * Handler for client's ACKs for payload traffic.
5303 *
5304 * @param cls Closure (unused).
5305 * @param client Identification of the client.
5306 * @param message The actual message.
5307 */
5308static void
5309handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client,
5310 const struct GNUNET_MessageHeader *message)
5311{
5312 struct GNUNET_MESH_LocalAck *msg;
5313 struct MeshTunnel *t;
5314 struct MeshClient *c;
5315 MESH_TunnelNumber tid;
5316
5317 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n");
5318 /* Sanity check for client registration */
5319 if (NULL == (c = client_get (client)))
5320 {
5321 GNUNET_break (0);
5322 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5323 return;
5324 }
5325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id);
5326
5327 msg = (struct GNUNET_MESH_LocalAck *) message;
5328
5329 /* Tunnel exists? */
5330 tid = ntohl (msg->tunnel_id);
5331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid);
5332 t = tunnel_get_by_local_id (c, tid);
5333 if (NULL == t)
5334 {
5335 GNUNET_break (0);
5336 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid);
5337 GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id);
5338 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5339 return;
5340 }
5341
5342 /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */
5343 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
5344 {
5345 /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */
5346 t->prev_fc.last_ack_recv++;
5347 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_NO);
5348 }
5349 else
5350 {
5351 /* The client doesn't own the tunnel, this ACK is for FWD traffic. */
5352 t->next_fc.last_ack_recv++;
5353 tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_YES);
5354 }
5355
5356 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5357
5358 return;
5359}
5360
5361
5362
5363/**
5364 * Iterator over all tunnels to send a monitoring client info about each tunnel.
5365 *
5366 * @param cls Closure (client handle).
5367 * @param key Key (hashed tunnel ID, unused).
5368 * @param value Tunnel info.
5369 *
5370 * @return GNUNET_YES, to keep iterating.
5371 */
5372static int
5373monitor_all_tunnels_iterator (void *cls,
5374 const struct GNUNET_HashCode * key,
5375 void *value)
5376{
5377 struct GNUNET_SERVER_Client *client = cls;
5378 struct MeshTunnel *t = value;
5379 struct GNUNET_MESH_LocalMonitor *msg;
5380
5381 msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor));
5382 GNUNET_PEER_resolve(t->id.oid, &msg->owner);
5383 msg->tunnel_id = htonl (t->id.tid);
5384 msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5385 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS);
5386 GNUNET_PEER_resolve (t->dest, &msg->destination);
5387
5388 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5389 "* sending info about tunnel %s [%u]\n",
5390 GNUNET_i2s (&msg->owner), t->id.tid);
5391
5392 GNUNET_SERVER_notification_context_unicast (nc, client,
5393 &msg->header, GNUNET_NO);
5394 return GNUNET_YES;
5395}
5396
5397
5398/**
5399 * Handler for client's MONITOR request.
5400 *
5401 * @param cls Closure (unused).
5402 * @param client Identification of the client.
5403 * @param message The actual message.
5404 */
5405static void
5406handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client,
5407 const struct GNUNET_MessageHeader *message)
5408{
5409 struct MeshClient *c;
5410
5411 /* Sanity check for client registration */
5412 if (NULL == (c = client_get (client)))
5413 {
5414 GNUNET_break (0);
5415 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5416 return;
5417 }
5418
5419 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5420 "Received get tunnels request from client %u\n",
5421 c->id);
5422 GNUNET_CONTAINER_multihashmap_iterate (tunnels,
5423 monitor_all_tunnels_iterator,
5424 client);
5425 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5426 "Get tunnels request from client %u completed\n",
5427 c->id);
5428 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5429}
5430
5431
5432/**
5433 * Handler for client's MONITOR_TUNNEL request.
5434 *
5435 * @param cls Closure (unused).
5436 * @param client Identification of the client.
5437 * @param message The actual message.
5438 */
5439static void
5440handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client,
5441 const struct GNUNET_MessageHeader *message)
5442{
5443 const struct GNUNET_MESH_LocalMonitor *msg;
5444 struct GNUNET_MESH_LocalMonitor *resp;
5445 struct MeshClient *c;
5446 struct MeshTunnel *t;
5447
5448 /* Sanity check for client registration */
5449 if (NULL == (c = client_get (client)))
5450 {
5451 GNUNET_break (0);
5452 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
5453 return;
5454 }
5455
5456 msg = (struct GNUNET_MESH_LocalMonitor *) message;
5457 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5458 "Received tunnel info request from client %u for tunnel %s[%X]\n",
5459 c->id,
5460 &msg->owner,
5461 ntohl (msg->tunnel_id));
5462 t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id));
5463 if (NULL == t)
5464 {
5465 /* We don't know the tunnel FIXME */
5466 struct GNUNET_MESH_LocalMonitor warn;
5467
5468 warn = *msg;
5469 GNUNET_SERVER_notification_context_unicast (nc, client,
5470 &warn.header,
5471 GNUNET_NO);
5472 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5473 return;
5474 }
5475
5476 /* Initialize context */
5477 resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor));
5478 *resp = *msg;
5479 GNUNET_PEER_resolve (t->dest, &resp->destination);
5480 resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor));
5481 GNUNET_SERVER_notification_context_unicast (nc, c->handle,
5482 &resp->header, GNUNET_NO);
5483 GNUNET_free (resp);
5484
5485 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5486 "Monitor tunnel request from client %u completed\n",
5487 c->id);
5488 GNUNET_SERVER_receive_done (client, GNUNET_OK);
5489}
5490
5491
5492/**
5493 * Functions to handle messages from clients
5494 */
5495static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
5496 {&handle_local_new_client, NULL,
5497 GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
5498 {&handle_local_tunnel_create, NULL,
5499 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
5500 sizeof (struct GNUNET_MESH_TunnelMessage)},
5501 {&handle_local_tunnel_destroy, NULL,
5502 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
5503 sizeof (struct GNUNET_MESH_TunnelMessage)},
5504 {&handle_local_data, NULL,
5505 GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0},
5506 {&handle_local_ack, NULL,
5507 GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK,
5508 sizeof (struct GNUNET_MESH_LocalAck)},
5509 {&handle_local_get_tunnels, NULL,
5510 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS,
5511 sizeof (struct GNUNET_MessageHeader)},
5512 {&handle_local_show_tunnel, NULL,
5513 GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL,
5514 sizeof (struct GNUNET_MESH_LocalMonitor)},
5515 {NULL, NULL, 0, 0}
5516};
5517
5518
5519/**
5520 * Method called whenever a given peer connects.
5521 *
5522 * @param cls closure
5523 * @param peer peer identity this notification is about
5524 */
5525static void
5526core_connect (void *cls, const struct GNUNET_PeerIdentity *peer)
5527{
5528 struct MeshPeer *peer_info;
5529 struct MeshPeerPath *path;
5530
5531 DEBUG_CONN ("Peer connected\n");
5532 DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id));
5533 peer_info = peer_get (peer);
5534 if (myid == peer_info->id)
5535 {
5536 DEBUG_CONN (" (self)\n");
5537 path = path_new (1);
5538 }
5539 else
5540 {
5541 DEBUG_CONN (" %s\n", GNUNET_i2s (peer));
5542 path = path_new (2);
5543 path->peers[1] = peer_info->id;
5544 GNUNET_PEER_change_rc (peer_info->id, 1);
5545 GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO);
5546 }
5547 path->peers[0] = myid;
5548 GNUNET_PEER_change_rc (myid, 1);
5549 peer_add_path (peer_info, path, GNUNET_YES);
5550 return;
5551}
5552
5553
5554/**
5555 * Method called whenever a peer disconnects.
5556 *
5557 * @param cls closure
5558 * @param peer peer identity this notification is about
5559 */
5560static void
5561core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
5562{
5563 struct MeshPeer *pi;
5564 struct MeshPeerQueue *q;
5565 struct MeshPeerQueue *n;
5566
5567 DEBUG_CONN ("Peer disconnected\n");
5568 pi = GNUNET_CONTAINER_multipeermap_get (peers, peer);
5569 if (NULL == pi)
5570 {
5571 GNUNET_break (0);
5572 return;
5573 }
5574 q = pi->queue_head;
5575 while (NULL != q)
5576 {
5577 n = q->next;
5578 /* TODO try to reroute this traffic instead */
5579 queue_destroy(q, GNUNET_YES);
5580 q = n;
5581 }
5582 if (NULL != pi->core_transmit)
5583 {
5584 GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit);
5585 pi->core_transmit = NULL;
5586 }
5587 peer_remove_path (pi, pi->id, myid);
5588 if (myid == pi->id)
5589 {
5590 DEBUG_CONN (" (self)\n");
5591 }
5592 GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO);
5593 return;
5594}
5595
5596
5597/**
5598 * Install server (service) handlers and start listening to clients.
5599 */
5600static void
5601server_init (void)
5602{
5603 GNUNET_SERVER_add_handlers (server_handle, client_handlers);
5604 GNUNET_SERVER_connect_notify (server_handle,
5605 &handle_local_client_connect, NULL);
5606 GNUNET_SERVER_disconnect_notify (server_handle,
5607 &handle_local_client_disconnect, NULL);
5608 nc = GNUNET_SERVER_notification_context_create (server_handle, 1);
5609
5610 clients_head = NULL;
5611 clients_tail = NULL;
5612 next_client_id = 0;
5613 GNUNET_SERVER_resume (server_handle);
5614}
5615
5616
5617/**
5618 * To be called on core init/fail.
5619 *
5620 * @param cls Closure (config)
5621 * @param identity the public identity of this peer
5622 */
5623static void
5624core_init (void *cls,
5625 const struct GNUNET_PeerIdentity *identity)
5626{
5627 const struct GNUNET_CONFIGURATION_Handle *c = cls;
5628 static int i = 0;
5629
5630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
5631 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
5632 {
5633 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
5634 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5635 " core id %s\n",
5636 GNUNET_i2s (identity));
5637 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5638 " my id %s\n",
5639 GNUNET_i2s (&my_full_id));
5640 GNUNET_CORE_disconnect (core_handle);
5641 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5642 NULL, /* Closure passed to MESH functions */
5643 &core_init, /* Call core_init once connected */
5644 &core_connect, /* Handle connects */
5645 &core_disconnect, /* remove peers on disconnects */
5646 NULL, /* Don't notify about all incoming messages */
5647 GNUNET_NO, /* For header only in notification */
5648 NULL, /* Don't notify about all outbound messages */
5649 GNUNET_NO, /* For header-only out notification */
5650 core_handlers); /* Register these handlers */
5651 if (10 < i++)
5652 GNUNET_abort();
5653 }
5654 server_init ();
5655 return;
5656}
5657
5658 85
5659/******************************************************************************/ 86/******************************************************************************/
5660/************************ MAIN FUNCTIONS ****************************/ 87/************************ MAIN FUNCTIONS ****************************/
5661/******************************************************************************/ 88/******************************************************************************/
5662 89
5663/** 90/**
5664 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
5665 *
5666 * @param cls closure
5667 * @param key current key code
5668 * @param value value in the hash map
5669 * @return GNUNET_YES if we should continue to iterate,
5670 * GNUNET_NO if not.
5671 */
5672static int
5673shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value)
5674{
5675 struct MeshTunnel *t = value;
5676
5677 tunnel_destroy (t);
5678 return GNUNET_YES;
5679}
5680
5681/**
5682 * Iterator over peer hash map entries to destroy the tunnel during shutdown.
5683 *
5684 * @param cls closure
5685 * @param key current key code
5686 * @param value value in the hash map
5687 * @return GNUNET_YES if we should continue to iterate,
5688 * GNUNET_NO if not.
5689 */
5690static int
5691shutdown_peer (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
5692{
5693 struct MeshPeer *p = value;
5694 struct MeshPeerQueue *q;
5695 struct MeshPeerQueue *n;
5696
5697 q = p->queue_head;
5698 while (NULL != q)
5699 {
5700 n = q->next;
5701 if (q->peer == p)
5702 {
5703 queue_destroy(q, GNUNET_YES);
5704 }
5705 q = n;
5706 }
5707 peer_destroy (p);
5708 return GNUNET_YES;
5709}
5710
5711
5712/**
5713 * Task run during shutdown. 91 * Task run during shutdown.
5714 * 92 *
5715 * @param cls unused 93 * @param cls unused
@@ -5720,28 +98,12 @@ shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
5720{ 98{
5721 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n"); 99 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n");
5722 100
5723 if (core_handle != NULL) 101 GML_shutdown ();
5724 { 102 GMD_shutdown ();
5725 GNUNET_CORE_disconnect (core_handle); 103 GMP_shutdown ();
5726 core_handle = NULL; 104 GMC_shutdown ();
5727 } 105 GMT_shutdown ();
5728 GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL); 106
5729 GNUNET_CONTAINER_multipeermap_iterate (peers, &shutdown_peer, NULL);
5730 if (dht_handle != NULL)
5731 {
5732 GNUNET_DHT_disconnect (dht_handle);
5733 dht_handle = NULL;
5734 }
5735 if (nc != NULL)
5736 {
5737 GNUNET_SERVER_notification_context_destroy (nc);
5738 nc = NULL;
5739 }
5740 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
5741 {
5742 GNUNET_SCHEDULER_cancel (announce_id_task);
5743 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
5744 }
5745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n"); 107 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n");
5746} 108}
5747 109
@@ -5757,176 +119,28 @@ static void
5757run (void *cls, struct GNUNET_SERVER_Handle *server, 119run (void *cls, struct GNUNET_SERVER_Handle *server,
5758 const struct GNUNET_CONFIGURATION_Handle *c) 120 const struct GNUNET_CONFIGURATION_Handle *c)
5759{ 121{
5760 char *keyfile;
5761 struct GNUNET_CRYPTO_EddsaPrivateKey *pk;
5762
5763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n"); 122 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n");
5764 server_handle = server;
5765 GNUNET_SERVER_suspend (server_handle);
5766
5767 if (GNUNET_OK !=
5768 GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY",
5769 &keyfile))
5770 {
5771 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5772 _
5773 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5774 "mesh", "peer/privatekey");
5775 GNUNET_SCHEDULER_shutdown ();
5776 return;
5777 }
5778
5779 if (GNUNET_OK !=
5780 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME",
5781 &refresh_path_time))
5782 {
5783 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5784 _
5785 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5786 "mesh", "refresh path time");
5787 GNUNET_SCHEDULER_shutdown ();
5788 return;
5789 }
5790
5791 if (GNUNET_OK !=
5792 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME",
5793 &id_announce_time))
5794 {
5795 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5796 _
5797 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5798 "mesh", "id announce time");
5799 GNUNET_SCHEDULER_shutdown ();
5800 return;
5801 }
5802
5803 if (GNUNET_OK !=
5804 GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT",
5805 &connect_timeout))
5806 {
5807 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5808 _
5809 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5810 "mesh", "connect timeout");
5811 GNUNET_SCHEDULER_shutdown ();
5812 return;
5813 }
5814 123
5815 if (GNUNET_OK !=
5816 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE",
5817 &max_msgs_queue))
5818 {
5819 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5820 _
5821 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5822 "mesh", "max msgs queue");
5823 GNUNET_SCHEDULER_shutdown ();
5824 return;
5825 }
5826
5827 if (GNUNET_OK !=
5828 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS",
5829 &max_tunnels))
5830 {
5831 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
5832 _
5833 ("%s service is lacking key configuration settings (%s). Exiting.\n"),
5834 "mesh", "max tunnels");
5835 GNUNET_SCHEDULER_shutdown ();
5836 return;
5837 }
5838
5839 if (GNUNET_OK !=
5840 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL",
5841 &default_ttl))
5842 {
5843 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5844 _
5845 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5846 "mesh", "default ttl", 64);
5847 default_ttl = 64;
5848 }
5849
5850 if (GNUNET_OK !=
5851 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS",
5852 &max_peers))
5853 {
5854 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5855 _("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5856 "mesh", "max peers", 1000);
5857 max_peers = 1000;
5858 }
5859
5860 if (GNUNET_OK !=
5861 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT",
5862 &drop_percent))
5863 {
5864 drop_percent = 0;
5865 }
5866 else
5867 {
5868 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5869 "Mesh is running with drop mode enabled. "
5870 "This is NOT a good idea! "
5871 "Remove the DROP_PERCENT option from your configuration.\n");
5872 }
5873
5874 if (GNUNET_OK !=
5875 GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL",
5876 &dht_replication_level))
5877 {
5878 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
5879 _
5880 ("%s service is lacking key configuration settings (%s). Using default (%u).\n"),
5881 "mesh", "dht replication level", 3);
5882 dht_replication_level = 3;
5883 }
5884
5885 tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO);
5886 incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32);
5887 peers = GNUNET_CONTAINER_multipeermap_create (32, GNUNET_NO);
5888 ports = GNUNET_CONTAINER_multihashmap32_create (32);
5889
5890 dht_handle = GNUNET_DHT_connect (c, 64);
5891 if (NULL == dht_handle)
5892 {
5893 GNUNET_break (0);
5894 }
5895 stats = GNUNET_STATISTICS_create ("mesh", c); 124 stats = GNUNET_STATISTICS_create ("mesh", c);
5896 125
5897 /* Scheduled the task to clean up when shutdown is called */ 126 /* Scheduled the task to clean up when shutdown is called */
5898 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, 127 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
5899 NULL); 128 NULL);
5900 pk = GNUNET_CRYPTO_eddsa_key_create_from_file (keyfile); 129 GNUNET_log (GNUNET_ERROR_TYPE_INFO, "reading key\n");
5901 GNUNET_free (keyfile); 130 my_private_key = GNUNET_CRYPTO_eddsa_key_create_from_configuration (c);
5902 GNUNET_assert (NULL != pk); 131 GNUNET_assert (NULL != my_private_key);
5903 my_private_key = pk; 132 GNUNET_CRYPTO_eddsa_key_get_public (my_private_key, &my_full_id.public_key);
5904 GNUNET_CRYPTO_eddsa_key_get_public (my_private_key,
5905 &my_full_id.public_key);
5906 myid = GNUNET_PEER_intern (&my_full_id); 133 myid = GNUNET_PEER_intern (&my_full_id);
5907 GNUNET_log (GNUNET_ERROR_TYPE_INFO, 134 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
5908 "Mesh for peer [%s] starting\n", 135 "Mesh for peer [%s] starting\n",
5909 GNUNET_i2s(&my_full_id)); 136 GNUNET_i2s (&my_full_id));
137
138 GML_init (server); /* Local clients */
139 GMC_init (c); /* Connections */
140 GMP_init (c); /* Peers */
141 GMD_init (c); /* DHT */
142 GMT_init (c, my_private_key); /* Tunnels */
5910 143
5911 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
5912 NULL, /* Closure passed to MESH functions */
5913 &core_init, /* Call core_init once connected */
5914 &core_connect, /* Handle connects */
5915 &core_disconnect, /* remove peers on disconnects */
5916 NULL, /* Don't notify about all incoming messages */
5917 GNUNET_NO, /* For header only in notification */
5918 NULL, /* Don't notify about all outbound messages */
5919 GNUNET_NO, /* For header-only out notification */
5920 core_handlers); /* Register these handlers */
5921 if (NULL == core_handle)
5922 {
5923 GNUNET_break (0);
5924 GNUNET_SCHEDULER_shutdown ();
5925 return;
5926 }
5927 next_tid = 0;
5928 next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
5929 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
5930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n"); 144 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\n");
5931} 145}
5932 146
@@ -5944,13 +158,12 @@ main (int argc, char *const *argv)
5944 int ret; 158 int ret;
5945 int r; 159 int r;
5946 160
5947 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n"); 161 fprintf (stderr, "main()\n");
5948 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run, 162 r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
5949 NULL); 163 NULL);
164 GNUNET_free (my_private_key);
5950 ret = (GNUNET_OK == r) ? 0 : 1; 165 ret = (GNUNET_OK == r) ? 0 : 1;
5951 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n"); 166 fprintf (stderr, "main() END\n");
5952
5953 INTERVAL_SHOW;
5954 167
5955 return ret; 168 return ret;
5956} 169}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 19:28:31 +0000