2 This file is part of GNUnet.
3 Copyright (C) 2013, 2015 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file cadet/gnunet-service-cadet_peer.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
26 #include "gnunet_util_lib.h"
27 #include "gnunet_signatures.h"
28 #include "gnunet_transport_service.h"
29 #include "gnunet_core_service.h"
30 #include "gnunet_statistics_service.h"
31 #include "cadet_protocol.h"
32 #include "gnunet-service-cadet_peer.h"
33 #include "gnunet-service-cadet_dht.h"
34 #include "gnunet-service-cadet_connection.h"
35 #include "gnunet-service-cadet_tunnel.h"
36 #include "cadet_path.h"
38 #define LOG(level, ...) GNUNET_log_from (level,"cadet-p2p",__VA_ARGS__)
39 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-p2p",__VA_ARGS__)
42 /******************************************************************************/
43 /******************************** STRUCTS **********************************/
44 /******************************************************************************/
47 * Struct containing info about a queued transmission to this peer
54 struct CadetPeerQueue *next;
59 struct CadetPeerQueue *prev;
62 * Peer this transmission is directed to.
64 struct CadetPeer *peer;
67 * Connection this message belongs to.
69 struct CadetConnection *c;
77 * Pointer to info stucture used as cls.
89 uint16_t payload_type;
102 * Set when this message starts waiting for CORE.
104 struct GNUNET_TIME_Absolute start_waiting;
107 * Function to call on sending.
112 * Closure for callback.
119 * Struct containing all information regarding a given peer
129 * Last time we heard from this peer
131 struct GNUNET_TIME_Absolute last_contact;
134 * Paths to reach the peer, ordered by ascending hop count
136 struct CadetPeerPath *path_head;
139 * Paths to reach the peer, ordered by ascending hop count
141 struct CadetPeerPath *path_tail;
144 * Handle to stop the DHT search for paths to this peer
146 struct GCD_search_handle *search_h;
149 * Handle to stop the DHT search for paths to this peer
151 struct GNUNET_SCHEDULER_Task *search_delayed;
154 * Tunnel to this peer, if any.
156 struct CadetTunnel *tunnel;
159 * Connections that go through this peer; indexed by tid.
161 struct GNUNET_CONTAINER_MultiHashMap *connections;
164 * Handle for queued transmissions
166 struct GNUNET_CORE_TransmitHandle *core_transmit;
171 struct GNUNET_TIME_Absolute tmt_time;
174 * Transmission queue to core DLL head
176 struct CadetPeerQueue *queue_head;
179 * Transmission queue to core DLL tail
181 struct CadetPeerQueue *queue_tail;
184 * How many messages are in the queue to this peer.
186 unsigned int queue_n;
191 struct GNUNET_HELLO_Message* hello;
195 /******************************************************************************/
196 /******************************* GLOBALS ***********************************/
197 /******************************************************************************/
200 * Global handle to the statistics service.
202 extern struct GNUNET_STATISTICS_Handle *stats;
205 * Local peer own ID (full value).
207 extern struct GNUNET_PeerIdentity my_full_id;
210 * Local peer own ID (short)
212 extern GNUNET_PEER_Id myid;
215 * Peers known, indexed by PeerIdentity, values of type `struct CadetPeer`.
217 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
220 * How many peers do we want to remember?
222 static unsigned long long max_peers;
225 * Percentage of messages that will be dropped (for test purposes only).
227 static unsigned long long drop_percent;
230 * Handle to communicate with core.
232 static struct GNUNET_CORE_Handle *core_handle;
235 * Handle to try to start new connections.
237 static struct GNUNET_TRANSPORT_Handle *transport_handle;
240 /******************************************************************************/
241 /***************************** DEBUG *********************************/
242 /******************************************************************************/
245 * Log all kinds of info about the queueing status of a peer.
247 * @param p Peer whose queue to show.
248 * @param level Error level to use for logging.
251 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
253 struct GNUNET_TIME_Relative core_wait_time;
254 struct CadetPeerQueue *q;
257 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
259 __FILE__, __FUNCTION__, __LINE__);
263 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
264 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
265 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
266 if (NULL != p->core_transmit)
268 core_wait_time = GNUNET_TIME_absolute_get_duration (p->tmt_time);
269 LOG2 (level, "QQQ core called %s ago\n",
270 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
272 for (q = p->queue_head; NULL != q; q = q->next)
274 LOG2 (level, "QQQ - %s %s on %s\n",
275 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
276 LOG2 (level, "QQQ payload %s, %u\n",
277 GC_m2s (q->payload_type), q->payload_id);
278 LOG2 (level, "QQQ size: %u bytes\n", q->size);
281 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
286 * Log all kinds of info about a peer.
291 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
293 struct CadetPeerPath *path;
297 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
299 __FILE__, __FUNCTION__, __LINE__);
305 LOG2 (level, "PPP DEBUG PEER NULL\n");
309 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
310 LOG2 (level, "PPP last contact %s\n",
311 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
312 for (path = p->path_head; NULL != path; path = path->next)
317 LOG2 (level, "PPP path: %s\n", s);
321 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
322 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
324 if (NULL != p->connections)
325 conns += GNUNET_CONTAINER_multihashmap_size (p->connections);
326 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
327 queue_debug (p, level);
328 LOG2 (level, "PPP DEBUG END\n");
332 /******************************************************************************/
333 /***************************** CORE HELPERS *********************************/
334 /******************************************************************************/
338 * Iterator to notify all connections of a broken link. Mark connections
339 * to destroy after all traffic has been sent.
341 * @param cls Closure (peer disconnected).
342 * @param key Current key code (peer id).
343 * @param value Value in the hash map (connection).
345 * @return #GNUNET_YES to continue to iterate.
348 notify_broken (void *cls,
349 const struct GNUNET_HashCode *key,
352 struct CadetPeer *peer = cls;
353 struct CadetConnection *c = value;
355 LOG (GNUNET_ERROR_TYPE_DEBUG,
356 "Notifying %s due to %s\n",
359 GCC_notify_broken (c,
366 * Remove the direct path to the peer.
368 * @param peer Peer to remove the direct path from.
371 static struct CadetPeerPath *
372 pop_direct_path (struct CadetPeer *peer)
374 struct CadetPeerPath *iter;
376 for (iter = peer->path_head; NULL != iter; iter = iter->next)
378 if (2 >= iter->length)
380 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
388 /******************************************************************************/
389 /***************************** CORE CALLBACKS *********************************/
390 /******************************************************************************/
394 * Method called whenever a given peer connects.
397 * @param peer peer identity this notification is about
400 core_connect (void *cls,
401 const struct GNUNET_PeerIdentity *peer)
403 struct CadetPeer *mp;
404 struct CadetPeerPath *path;
407 GNUNET_snprintf (own_id,
410 GNUNET_i2s (&my_full_id));
414 LOG (GNUNET_ERROR_TYPE_INFO,
415 "CONNECTED %s (self)\n",
421 LOG (GNUNET_ERROR_TYPE_INFO,
422 "CONNECTED %s <= %s\n",
426 path->peers[1] = mp->id;
427 GNUNET_PEER_change_rc (mp->id, 1);
429 path->peers[0] = myid;
430 GNUNET_PEER_change_rc (myid, 1);
431 GCP_add_path (mp, path, GNUNET_YES);
432 GNUNET_STATISTICS_update (stats,
436 GNUNET_assert (NULL == mp->connections);
437 mp->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
439 if ( (NULL != GCP_get_tunnel (mp)) &&
440 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
446 * Method called whenever a peer disconnects.
449 * @param peer peer identity this notification is about
452 core_disconnect (void *cls,
453 const struct GNUNET_PeerIdentity *peer)
456 struct CadetPeerPath *direct_path;
459 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
460 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
467 LOG (GNUNET_ERROR_TYPE_INFO,
468 "DISCONNECTED %s (self)\n",
471 LOG (GNUNET_ERROR_TYPE_INFO,
472 "DISCONNECTED %s <= %s\n",
473 own_id, GNUNET_i2s (peer));
474 direct_path = pop_direct_path (p);
475 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
478 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
479 p->connections = NULL;
480 if (NULL != p->core_transmit)
482 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
483 p->core_transmit = NULL;
484 p->tmt_time.abs_value_us = 0;
486 GNUNET_STATISTICS_update (stats,
490 path_destroy (direct_path);
495 * Functions to handle messages from core
497 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
498 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
499 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
500 sizeof (struct GNUNET_CADET_ConnectionACK)},
501 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
502 sizeof (struct GNUNET_CADET_ConnectionBroken)},
503 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
504 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
505 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
506 sizeof (struct GNUNET_CADET_ACK)},
507 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
508 sizeof (struct GNUNET_CADET_Poll)},
509 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
510 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
511 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
517 * To be called on core init/fail.
519 * @param cls Closure (config)
520 * @param identity the public identity of this peer
523 core_init (void *cls,
524 const struct GNUNET_PeerIdentity *identity)
526 const struct GNUNET_CONFIGURATION_Handle *c = cls;
529 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
530 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
532 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
533 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
534 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
535 GNUNET_CORE_disconnect (core_handle);
536 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
537 NULL, /* Closure passed to CADET functions */
538 &core_init, /* Call core_init once connected */
539 &core_connect, /* Handle connects */
540 &core_disconnect, /* remove peers on disconnects */
541 NULL, /* Don't notify about all incoming messages */
542 GNUNET_NO, /* For header only in notification */
543 NULL, /* Don't notify about all outbound messages */
544 GNUNET_NO, /* For header-only out notification */
545 core_handlers); /* Register these handlers */
554 * Core callback to write a pre-constructed data packet to core buffer
556 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
557 * @param size Number of bytes available in buf.
558 * @param buf Where the to write the message.
560 * @return number of bytes written to buf
563 send_core_data_raw (void *cls, size_t size, void *buf)
565 struct GNUNET_MessageHeader *msg = cls;
568 GNUNET_assert (NULL != msg);
569 total_size = ntohs (msg->size);
571 if (total_size > size)
576 memcpy (buf, msg, total_size);
583 * Function to send a create connection message to a peer.
585 * @param c Connection to create.
586 * @param size number of bytes available in buf
587 * @param buf where the callee should write the message
588 * @return number of bytes written to buf
591 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
593 struct GNUNET_CADET_ConnectionCreate *msg;
594 struct GNUNET_PeerIdentity *peer_ptr;
595 const struct CadetPeerPath *p = GCC_get_path (c);
602 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
604 sizeof (struct GNUNET_CADET_ConnectionCreate) +
605 p->length * sizeof (struct GNUNET_PeerIdentity);
607 if (size < size_needed || NULL == buf)
612 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
613 msg->header.size = htons (size_needed);
614 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
615 msg->cid = *GCC_get_id (c);
617 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
618 for (i = 0; i < p->length; i++)
620 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
623 LOG (GNUNET_ERROR_TYPE_DEBUG,
624 "CONNECTION CREATE (%u bytes long) sent!\n",
631 * Creates a path ack message in buf and frees all unused resources.
633 * @param c Connection to send an ACK on.
634 * @param size number of bytes available in buf
635 * @param buf where the callee should write the message
637 * @return number of bytes written to buf
640 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
642 struct GNUNET_CADET_ConnectionACK *msg = buf;
644 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
645 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
650 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
651 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
652 msg->cid = *GCC_get_id (c);
654 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
655 return sizeof (struct GNUNET_CADET_ConnectionACK);
659 /******************************************************************************/
660 /******************************** STATIC ***********************************/
661 /******************************************************************************/
665 * Get priority for a queued message.
667 * @param q Queued message
669 * @return CORE priority to use.
671 static enum GNUNET_CORE_Priority
672 get_priority (struct CadetPeerQueue *q)
674 enum GNUNET_CORE_Priority low;
675 enum GNUNET_CORE_Priority high;
680 return GNUNET_CORE_PRIO_BACKGROUND;
683 /* Relayed traffic has lower priority, our own traffic has higher */
684 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
686 low = GNUNET_CORE_PRIO_BEST_EFFORT;
687 high = GNUNET_CORE_PRIO_URGENT;
691 low = GNUNET_CORE_PRIO_URGENT;
692 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
695 /* Bulky payload has lower priority, control traffic has higher. */
696 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
697 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
705 * Destroy the peer_info and free any allocated resources linked to it
707 * @param peer The peer_info to destroy.
708 * @return #GNUNET_OK on success
711 peer_destroy (struct CadetPeer *peer)
713 struct GNUNET_PeerIdentity id;
714 struct CadetPeerPath *p;
715 struct CadetPeerPath *nextp;
717 GNUNET_PEER_resolve (peer->id, &id);
718 GNUNET_PEER_change_rc (peer->id, -1);
720 LOG (GNUNET_ERROR_TYPE_INFO,
721 "destroying peer %s\n",
724 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
727 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
729 GCP_stop_search (peer);
734 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
738 if (NULL != peer->tunnel)
739 GCT_destroy_empty (peer->tunnel);
740 GNUNET_free_non_null (peer->hello);
747 * Iterator over peer hash map entries to destroy the peer during shutdown.
750 * @param key current key code
751 * @param value value in the hash map
752 * @return #GNUNET_YES if we should continue to iterate,
756 shutdown_peer (void *cls,
757 const struct GNUNET_PeerIdentity *key,
760 struct CadetPeer *p = value;
761 struct CadetTunnel *t = p->tunnel;
773 * Check if peer is searching for a path (either active or delayed search).
775 * @param peer Peer to check
776 * @return #GNUNET_YES if there is a search active.
777 * #GNUNET_NO otherwise.
780 is_searching (const struct CadetPeer *peer)
782 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
783 GNUNET_NO : GNUNET_YES;
788 * @brief Start a search for a peer.
790 * @param cls Closure (Peer to search for).
791 * @param tc Task context.
794 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
796 struct CadetPeer *peer = cls;
798 peer->search_delayed = NULL;
800 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
803 GCP_start_search (peer);
808 * Returns if peer is used (has a tunnel or is neighbor).
810 * @param peer Peer to check.
811 * @return #GNUNET_YES if peer is in use.
814 peer_is_used (struct CadetPeer *peer)
816 struct CadetPeerPath *p;
818 if (NULL != peer->tunnel)
821 for (p = peer->path_head; NULL != p; p = p->next)
831 * Iterator over all the peers to get the oldest timestamp.
833 * @param cls Closure (unsued).
834 * @param key ID of the peer.
835 * @param value Peer_Info of the peer.
838 peer_get_oldest (void *cls,
839 const struct GNUNET_PeerIdentity *key,
842 struct CadetPeer *p = value;
843 struct GNUNET_TIME_Absolute *abs = cls;
845 /* Don't count active peers */
846 if (GNUNET_YES == peer_is_used (p))
849 if (abs->abs_value_us < p->last_contact.abs_value_us)
850 abs->abs_value_us = p->last_contact.abs_value_us;
857 * Iterator over all the peers to remove the oldest entry.
859 * @param cls Closure (unsued).
860 * @param key ID of the peer.
861 * @param value Peer_Info of the peer.
864 peer_timeout (void *cls,
865 const struct GNUNET_PeerIdentity *key,
868 struct CadetPeer *p = value;
869 struct GNUNET_TIME_Absolute *abs = cls;
871 LOG (GNUNET_ERROR_TYPE_WARNING,
872 "peer %s timeout\n", GNUNET_i2s (key));
874 if (p->last_contact.abs_value_us == abs->abs_value_us &&
875 GNUNET_NO == peer_is_used (p))
885 * Delete oldest unused peer.
888 peer_delete_oldest (void)
890 struct GNUNET_TIME_Absolute abs;
892 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
894 GNUNET_CONTAINER_multipeermap_iterate (peers,
897 GNUNET_CONTAINER_multipeermap_iterate (peers,
904 * Choose the best (yet unused) path towards a peer,
905 * considering the tunnel properties.
907 * @param peer The destination peer.
908 * @return Best current known path towards the peer, if any.
910 static struct CadetPeerPath *
911 peer_get_best_path (const struct CadetPeer *peer)
913 struct CadetPeerPath *best_p;
914 struct CadetPeerPath *p;
915 unsigned int best_cost;
918 best_cost = UINT_MAX;
920 for (p = peer->path_head; NULL != p; p = p->next)
922 if (GNUNET_NO == path_is_valid (p))
923 continue; /* Don't use invalid paths. */
924 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
925 continue; /* If path is already in use, skip it. */
927 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
938 * Is this queue element sendable?
940 * - All management traffic is always sendable.
941 * - For payload traffic, check the connection flow control.
943 * @param q Queue element to inspect.
944 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
947 queue_is_sendable (struct CadetPeerQueue *q)
949 /* Is PID-independent? */
952 case GNUNET_MESSAGE_TYPE_CADET_ACK:
953 case GNUNET_MESSAGE_TYPE_CADET_POLL:
954 case GNUNET_MESSAGE_TYPE_CADET_KX:
955 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
956 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
957 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
958 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
961 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
962 case GNUNET_MESSAGE_TYPE_CADET_AX:
969 return GCC_is_sendable (q->c, q->fwd);
974 * Get first sendable message.
976 * @param peer The destination peer.
978 * @return First transmittable message, if any. Otherwise, NULL.
980 static struct CadetPeerQueue *
981 peer_get_first_message (const struct CadetPeer *peer)
983 struct CadetPeerQueue *q;
985 for (q = peer->queue_head; NULL != q; q = q->next)
987 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
988 if (queue_is_sendable (q))
997 * Function to process paths received for a new peer addition. The recorded
998 * paths form the initial tunnel, which can be optimized later.
999 * Called on each result obtained for the DHT search.
1001 * @param cls closure
1005 search_handler (void *cls, const struct CadetPeerPath *path)
1007 struct CadetPeer *peer = cls;
1008 unsigned int connection_count;
1010 GCP_add_path_to_all (path, GNUNET_NO);
1012 /* Count connections */
1013 connection_count = GCT_count_connections (peer->tunnel);
1015 /* If we already have our minimum (or more) connections, it's enough */
1016 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1019 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1021 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1028 * Adjust core requested size to accomodate an ACK.
1030 * @param message_size Requested size.
1032 * @return Size enough to fit @c message_size and an ACK.
1035 get_core_size (size_t message_size)
1037 return message_size + sizeof (struct GNUNET_CADET_ACK);
1042 * Fill a core buffer with the appropriate data for the queued message.
1044 * @param queue Queue element for the message.
1045 * @param buf Core buffer to fill.
1046 * @param size Size remaining in @c buf.
1047 * @param[out] pid In case its an encrypted payload, set payload.
1049 * @return Bytes written to @c buf.
1052 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1054 struct CadetConnection *c = queue->c;
1057 switch (queue->type)
1059 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1060 *pid = GCC_get_pid (queue->c, queue->fwd);
1061 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1062 msg_size = send_core_data_raw (queue->cls, size, buf);
1063 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1065 case GNUNET_MESSAGE_TYPE_CADET_AX:
1066 *pid = GCC_get_pid (queue->c, queue->fwd);
1067 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1068 msg_size = send_core_data_raw (queue->cls, size, buf);
1069 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1071 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1072 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1073 case GNUNET_MESSAGE_TYPE_CADET_KX:
1074 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1075 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1076 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1077 msg_size = send_core_data_raw (queue->cls, size, buf);
1079 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1080 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1081 if (GCC_is_origin (c, GNUNET_YES))
1082 msg_size = send_core_connection_create (c, size, buf);
1084 msg_size = send_core_data_raw (queue->cls, size, buf);
1086 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1087 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1088 if (GCC_is_origin (c, GNUNET_NO) ||
1089 GCC_is_origin (c, GNUNET_YES))
1091 msg_size = send_core_connection_ack (c, size, buf);
1095 msg_size = send_core_data_raw (queue->cls, size, buf);
1098 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1099 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1100 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1101 /* This should be encapsulted */
1107 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1111 GNUNET_assert (size >= msg_size);
1118 * Core callback to write a queued packet to core buffer
1120 * @param cls Closure (peer info).
1121 * @param size Number of bytes available in buf.
1122 * @param buf Where the to write the message.
1124 * @return number of bytes written to buf
1127 queue_send (void *cls, size_t size, void *buf)
1129 struct CadetPeer *peer = cls;
1130 struct CadetConnection *c;
1131 struct CadetPeerQueue *queue;
1132 struct GNUNET_TIME_Relative core_wait_time;
1133 const struct GNUNET_PeerIdentity *dst_id;
1140 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1142 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1143 GCP_2s (peer), size);
1145 /* Sanity checking */
1146 if (NULL == buf || 0 == size)
1148 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1149 peer->tmt_time.abs_value_us = 0;
1150 peer->core_transmit = NULL;
1159 peer->core_transmit = NULL;
1160 queue = peer_get_first_message (peer);
1163 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1164 peer->tmt_time.abs_value_us = 0;
1167 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1169 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1170 peer->tmt_time.abs_value_us = 0;
1172 /* Copy all possible messages to the core buffer */
1173 while (NULL != queue && rest >= queue->size)
1177 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1178 GCC_2s (c), GC_f2s(queue->fwd));
1179 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1180 queue->size, total_size, size);
1182 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1184 if (0 < drop_percent &&
1185 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1187 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1188 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1189 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1194 LOG (GNUNET_ERROR_TYPE_INFO,
1195 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1196 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1197 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1199 total_size += msg_size;
1201 dst = &dst[msg_size];
1204 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1205 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1208 queue = peer_get_first_message (peer);
1211 /* If more data in queue, send next */
1214 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1215 if (NULL == peer->core_transmit)
1217 dst_id = GNUNET_PEER_resolve2 (peer->id);
1218 peer->core_transmit =
1219 GNUNET_CORE_notify_transmit_ready (core_handle,
1220 GNUNET_NO, get_priority (queue),
1221 GNUNET_TIME_UNIT_FOREVER_REL,
1223 get_core_size (queue->size),
1226 peer->tmt_time = GNUNET_TIME_absolute_get ();
1227 queue->start_waiting = GNUNET_TIME_absolute_get ();
1231 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1233 // GCC_start_poll (); FIXME needed?
1237 // GCC_stop_poll(); FIXME needed?
1240 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1241 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1247 /******************************************************************************/
1248 /******************************** API ***********************************/
1249 /******************************************************************************/
1253 * Free a transmission that was already queued with all resources
1254 * associated to the request.
1256 * If connection was marked to be destroyed, and this was the last queued
1257 * message on it, the connection will be free'd as a result.
1259 * @param queue Queue handler to cancel.
1260 * @param clear_cls Is it necessary to free associated cls?
1261 * @param sent Was it really sent? (Could have been canceled)
1262 * @param pid PID, if relevant (was sent and was a payload message).
1264 * @return #GNUNET_YES if connection was destroyed as a result,
1265 * #GNUNET_NO otherwise.
1268 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1269 int sent, uint32_t pid)
1271 struct CadetPeer *peer;
1272 int connection_destroyed;
1275 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1276 if (GNUNET_YES == clear_cls)
1278 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1279 switch (queue->type)
1281 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1282 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1284 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1285 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1286 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1287 case GNUNET_MESSAGE_TYPE_CADET_KX:
1288 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1289 case GNUNET_MESSAGE_TYPE_CADET_AX:
1290 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1291 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1292 GNUNET_free_non_null (queue->cls);
1297 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1298 GC_m2s (queue->type));
1301 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1303 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1304 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1309 if (NULL != queue->cont)
1311 struct GNUNET_TIME_Relative wait_time;
1313 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1314 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1315 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1316 connection_destroyed = queue->cont (queue->cont_cls,
1317 queue->c, sent, queue->type, pid,
1318 queue->fwd, queue->size, wait_time);
1322 connection_destroyed = GNUNET_NO;
1325 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1327 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1328 peer->core_transmit = NULL;
1329 peer->tmt_time.abs_value_us = 0;
1332 GNUNET_free (queue);
1333 return connection_destroyed;
1338 * @brief Queue and pass message to core when possible.
1340 * @param peer Peer towards which to queue the message.
1341 * @param cls Closure (@c type dependant). It will be used by queue_send to
1342 * build the message to be sent if not already prebuilt.
1343 * @param type Type of the message, 0 for a raw message.
1344 * @param size Size of the message.
1345 * @param c Connection this message belongs to (can be NULL).
1346 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1347 * @param cont Continuation to be called once CORE has taken the message.
1348 * @param cont_cls Closure for @c cont.
1350 * @return Handle to cancel the message before it is sent. Once cont is called
1351 * message has been sent and therefore the handle is no longer valid.
1353 struct CadetPeerQueue *
1354 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1355 uint16_t payload_type, uint32_t payload_id, size_t size,
1356 struct CadetConnection *c, int fwd,
1357 GCP_sent cont, void *cont_cls)
1359 struct CadetPeerQueue *q;
1364 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1365 error_level = GNUNET_ERROR_TYPE_ERROR;
1367 error_level = GNUNET_ERROR_TYPE_INFO;
1369 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1370 GC_m2s (type), GC_m2s (payload_type), payload_id,
1371 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1373 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1375 if (NULL == peer->connections)
1377 /* We are not connected to this peer, ignore request. */
1378 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1379 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1386 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1387 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1392 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1394 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1395 GNUNET_YES : GCC_is_sendable (c, fwd);
1396 q = GNUNET_new (struct CadetPeerQueue);
1399 q->payload_type = payload_type;
1400 q->payload_id = payload_id;
1406 q->cont_cls = cont_cls;
1409 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1414 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1415 call_core = GNUNET_YES;
1418 q->start_waiting = GNUNET_TIME_absolute_get ();
1419 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1421 LOG (GNUNET_ERROR_TYPE_DEBUG,
1422 "calling core tmt rdy towards %s for %u bytes\n",
1423 GCP_2s (peer), size);
1424 peer->core_transmit =
1425 GNUNET_CORE_notify_transmit_ready (core_handle,
1426 GNUNET_NO, get_priority (q),
1427 GNUNET_TIME_UNIT_FOREVER_REL,
1428 GNUNET_PEER_resolve2 (peer->id),
1429 get_core_size (size),
1431 peer->tmt_time = GNUNET_TIME_absolute_get ();
1433 else if (GNUNET_NO == call_core)
1435 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1441 struct GNUNET_TIME_Relative elapsed;
1442 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1443 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1445 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1448 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1454 * Cancel all queued messages to a peer that belong to a certain connection.
1456 * @param peer Peer towards whom to cancel.
1457 * @param c Connection whose queued messages to cancel. Might be destroyed by
1458 * the sent continuation call.
1461 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1463 struct CadetPeerQueue *q;
1464 struct CadetPeerQueue *next;
1465 struct CadetPeerQueue *prev;
1466 int connection_destroyed;
1468 connection_destroyed = GNUNET_NO;
1469 for (q = peer->queue_head; NULL != q; q = next)
1474 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1475 GNUNET_break (GNUNET_NO == connection_destroyed);
1476 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1482 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1485 /* Get next from prev, q->next might be already freed:
1486 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1489 next = peer->queue_head;
1499 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1501 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1502 peer->core_transmit = NULL;
1503 peer->tmt_time.abs_value_us = 0;
1509 * Get the first transmittable message for a connection.
1511 * @param peer Neighboring peer.
1512 * @param c Connection.
1514 * @return First transmittable message.
1516 static struct CadetPeerQueue *
1517 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1519 struct CadetPeerQueue *q;
1521 for (q = peer->queue_head; NULL != q; q = q->next)
1525 if (queue_is_sendable (q))
1527 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1530 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1538 * Get the first message for a connection and unqueue it.
1540 * Only tunnel (or higher) level messages are unqueued. Connection specific
1541 * messages are silently destroyed upon encounter.
1543 * @param peer Neighboring peer.
1544 * @param c Connection.
1545 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1548 * @return First message for this connection.
1550 struct GNUNET_MessageHeader *
1551 GCP_connection_pop (struct CadetPeer *peer,
1552 struct CadetConnection *c,
1555 struct CadetPeerQueue *q;
1556 struct CadetPeerQueue *next;
1557 struct GNUNET_MessageHeader *msg;
1560 GNUNET_assert (NULL != destroyed);
1561 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1562 for (q = peer->queue_head; NULL != q; q = next)
1567 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1568 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1572 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1573 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1574 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1575 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1576 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1577 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1578 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1579 if (GNUNET_YES == dest)
1581 GNUNET_break (GNUNET_NO == *destroyed);
1582 *destroyed = GNUNET_YES;
1586 case GNUNET_MESSAGE_TYPE_CADET_KX:
1587 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1588 case GNUNET_MESSAGE_TYPE_CADET_AX:
1589 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1590 msg = (struct GNUNET_MessageHeader *) q->cls;
1591 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1592 if (GNUNET_YES == dest)
1594 GNUNET_break (GNUNET_NO == *destroyed);
1595 *destroyed = GNUNET_YES;
1601 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1609 * Unlock a possibly locked queue for a connection.
1611 * If there is a message that can be sent on this connection, call core for it.
1612 * Otherwise (if core transmit is already called or there is no sendable
1613 * message) do nothing.
1615 * @param peer Peer who keeps the queue.
1616 * @param c Connection whose messages to unlock.
1619 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1621 struct CadetPeerQueue *q;
1624 if (NULL != peer->core_transmit)
1626 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1627 return; /* Already unlocked */
1630 q = connection_get_first_message (peer, c);
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1634 return; /* Nothing to transmit */
1638 peer->core_transmit =
1639 GNUNET_CORE_notify_transmit_ready (core_handle,
1640 GNUNET_NO, get_priority (q),
1641 GNUNET_TIME_UNIT_FOREVER_REL,
1642 GNUNET_PEER_resolve2 (peer->id),
1643 get_core_size (size),
1646 peer->tmt_time = GNUNET_TIME_absolute_get ();
1651 * Initialize the peer subsystem.
1653 * @param c Configuration.
1656 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1658 LOG (GNUNET_ERROR_TYPE_DEBUG,
1660 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1662 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1665 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1666 "CADET", "MAX_PEERS", "USING DEFAULT");
1671 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1678 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1679 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1680 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1681 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1682 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1685 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1686 NULL, /* Closure passed to CADET functions */
1687 &core_init, /* Call core_init once connected */
1688 &core_connect, /* Handle connects */
1689 &core_disconnect, /* remove peers on disconnects */
1690 NULL, /* Don't notify about all incoming messages */
1691 GNUNET_NO, /* For header only in notification */
1692 NULL, /* Don't notify about all outbound messages */
1693 GNUNET_NO, /* For header-only out notification */
1694 core_handlers); /* Register these handlers */
1696 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1698 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1699 /* Notify callbacks */
1704 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1705 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1706 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1707 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1708 transport_handle = NULL;
1713 if (NULL == core_handle)
1716 GNUNET_SCHEDULER_shutdown ();
1724 * Shut down the peer subsystem.
1729 GNUNET_CONTAINER_multipeermap_iterate (peers,
1732 if (NULL != core_handle)
1734 GNUNET_CORE_disconnect (core_handle);
1737 if (NULL != transport_handle)
1739 GNUNET_TRANSPORT_disconnect (transport_handle);
1740 transport_handle = NULL;
1742 GNUNET_PEER_change_rc (myid, -1);
1743 GNUNET_CONTAINER_multipeermap_destroy (peers);
1749 * Retrieve the CadetPeer stucture associated with the peer, create one
1750 * and insert it in the appropriate structures if the peer is not known yet.
1752 * @param peer_id Full identity of the peer.
1754 * @return Existing or newly created peer structure.
1757 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1759 struct CadetPeer *peer;
1761 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1764 peer = GNUNET_new (struct CadetPeer);
1765 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1767 peer_delete_oldest ();
1769 GNUNET_assert (GNUNET_OK ==
1770 GNUNET_CONTAINER_multipeermap_put (peers,
1773 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1774 peer->id = GNUNET_PEER_intern (peer_id);
1776 peer->last_contact = GNUNET_TIME_absolute_get ();
1783 * Retrieve the CadetPeer stucture associated with the peer, create one
1784 * and insert it in the appropriate structures if the peer is not known yet.
1786 * @param peer Short identity of the peer.
1788 * @return Existing or newly created peer structure.
1791 GCP_get_short (const GNUNET_PEER_Id peer)
1793 return GCP_get (GNUNET_PEER_resolve2 (peer));
1798 * Try to connect to a peer on transport level.
1800 * @param cls Closure (peer).
1801 * @param tc TaskContext.
1804 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1806 struct CadetPeer *peer = cls;
1808 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1811 GNUNET_TRANSPORT_try_connect (transport_handle,
1812 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1817 * Try to establish a new connection to this peer (in its tunnel).
1818 * If the peer doesn't have any path to it yet, try to get one.
1819 * If the peer already has some path, send a CREATE CONNECTION towards it.
1821 * @param peer Peer to connect to.
1824 GCP_connect (struct CadetPeer *peer)
1826 struct CadetTunnel *t;
1827 struct CadetPeerPath *p;
1828 struct CadetConnection *c;
1831 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1833 /* If we have a current hello, try to connect using it. */
1834 GCP_try_connect (peer);
1838 rerun_search = GNUNET_NO;
1840 if (NULL != peer->path_head)
1842 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1843 p = peer_get_best_path (peer);
1849 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1852 c = GCT_use_path (t, p);
1855 /* This case can happen when the path includes a first hop that is
1856 * not yet known to be connected.
1858 * This happens quite often during testing when running cadet
1859 * under valgrind: core connect notifications come very late
1860 * and the DHT result has already come and created a valid
1861 * path. In this case, the peer->connections_{pred,succ}
1862 * hashmaps will be NULL and tunnel_use_path will not be able
1863 * to create a connection from that path.
1865 * Re-running the DHT GET should give core time to callback.
1867 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1868 * updating statistics about this issue.
1870 rerun_search = GNUNET_YES;
1874 GCC_send_create (c);
1880 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1884 if (GNUNET_YES == rerun_search)
1886 struct GNUNET_TIME_Relative delay;
1888 GCP_stop_search (peer);
1889 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1890 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1895 if (GNUNET_NO == is_searching (peer))
1896 GCP_start_search (peer);
1901 * Chech whether there is a direct (core level) connection to peer.
1903 * @param peer Peer to check.
1905 * @return #GNUNET_YES if there is a direct connection.
1908 GCP_is_neighbor (const struct CadetPeer *peer)
1910 struct CadetPeerPath *path;
1912 if (NULL == peer->connections)
1915 for (path = peer->path_head; NULL != path; path = path->next)
1917 if (3 > path->length)
1921 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1927 * Create and initialize a new tunnel towards a peer, in case it has none.
1928 * In case the peer already has a tunnel, nothing is done.
1930 * Does not generate any traffic, just creates the local data structures.
1932 * @param peer Peer towards which to create the tunnel.
1935 GCP_add_tunnel (struct CadetPeer *peer)
1937 if (NULL != peer->tunnel)
1939 peer->tunnel = GCT_new (peer);
1944 * Add a connection to a neighboring peer.
1946 * Store that the peer is the first hop of the connection in one
1947 * direction and that on peer disconnect the connection must be
1948 * notified and destroyed, for it will no longer be valid.
1950 * @param peer Peer to add connection to.
1951 * @param c Connection to add.
1952 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1955 GCP_add_connection (struct CadetPeer *peer,
1956 struct CadetConnection *c,
1959 LOG (GNUNET_ERROR_TYPE_DEBUG,
1960 "adding connection %s\n",
1962 LOG (GNUNET_ERROR_TYPE_DEBUG,
1965 GNUNET_assert (NULL != peer->connections);
1966 GNUNET_assert (GNUNET_OK ==
1967 GNUNET_CONTAINER_multihashmap_put (peer->connections,
1970 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1971 LOG (GNUNET_ERROR_TYPE_DEBUG,
1972 "Peer %s has now %u connections.\n",
1974 GNUNET_CONTAINER_multihashmap_size (peer->connections));
1979 * Add the path to the peer and update the path used to reach it in case this
1982 * @param peer Destination peer to add the path to.
1983 * @param path New path to add. Last peer must be the peer in arg 1.
1984 * Path will be either used of freed if already known.
1985 * @param trusted Do we trust that this path is real?
1987 * @return path if path was taken, pointer to existing duplicate if exists
1990 struct CadetPeerPath *
1991 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
1994 struct CadetPeerPath *aux;
1998 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1999 path->length, GCP_2s (peer));
2001 if (NULL == peer || NULL == path
2002 || path->peers[path->length - 1] != peer->id)
2005 path_destroy (path);
2009 for (l = 1; l < path->length; l++)
2011 if (path->peers[l] == myid)
2013 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2014 for (l2 = 0; l2 < path->length - l; l2++)
2016 path->peers[l2] = path->peers[l + l2];
2020 path->peers = GNUNET_realloc (path->peers,
2021 path->length * sizeof (GNUNET_PEER_Id));
2025 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2027 if (2 >= path->length && GNUNET_NO == trusted)
2029 /* Only allow CORE to tell us about direct paths */
2030 path_destroy (path);
2034 l = path_get_length (path);
2037 path_destroy (path);
2041 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2042 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2044 l2 = path_get_length (aux);
2047 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2048 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2049 peer->path_tail, aux, path);
2054 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2056 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2057 path_destroy (path);
2062 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2064 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2067 if (NULL != peer->tunnel
2068 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2077 * Add the path to the origin peer and update the path used to reach it in case
2078 * this is the shortest.
2079 * The path is given in peer_info -> destination, therefore we turn the path
2080 * upside down first.
2082 * @param peer Peer to add the path to, being the origin of the path.
2083 * @param path New path to add after being inversed.
2084 * Path will be either used or freed.
2085 * @param trusted Do we trust that this path is real?
2087 * @return path if path was taken, pointer to existing duplicate if exists
2090 struct CadetPeerPath *
2091 GCP_add_path_to_origin (struct CadetPeer *peer,
2092 struct CadetPeerPath *path,
2098 return GCP_add_path (peer, path, trusted);
2103 * Adds a path to the info of all the peers in the path
2105 * @param p Path to process.
2106 * @param confirmed Whether we know if the path works or not.
2109 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2113 /* TODO: invert and add */
2114 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2115 for (i++; i < p->length; i++)
2117 struct CadetPeer *aux;
2118 struct CadetPeerPath *copy;
2120 aux = GCP_get_short (p->peers[i]);
2121 copy = path_duplicate (p);
2122 copy->length = i + 1;
2123 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2129 * Remove any path to the peer that has the extact same peers as the one given.
2131 * @param peer Peer to remove the path from.
2132 * @param path Path to remove. Is always destroyed .
2135 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2137 struct CadetPeerPath *iter;
2138 struct CadetPeerPath *next;
2140 GNUNET_assert (myid == path->peers[0]);
2141 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2143 LOG (GNUNET_ERROR_TYPE_INFO,
2144 "Removing path %p (%u) from %s\n",
2149 for (iter = peer->path_head; NULL != iter; iter = next)
2152 if (0 == path_cmp (path, iter))
2154 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2156 path_destroy (iter);
2159 path_destroy (path);
2164 * Remove a connection from a neighboring peer.
2166 * @param peer Peer to remove connection from.
2167 * @param c Connection to remove.
2170 GCP_remove_connection (struct CadetPeer *peer,
2171 const struct CadetConnection *c)
2173 LOG (GNUNET_ERROR_TYPE_DEBUG,
2174 "Removing connection %s\n",
2176 LOG (GNUNET_ERROR_TYPE_DEBUG,
2179 if ( (NULL == peer) ||
2180 (NULL == peer->connections) )
2182 GNUNET_assert (GNUNET_YES ==
2183 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2186 LOG (GNUNET_ERROR_TYPE_DEBUG,
2187 "Peer %s reamins with %u connections.\n",
2189 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2194 * Start the DHT search for new paths towards the peer: we don't have
2195 * enough good connections.
2197 * @param peer Destination peer.
2200 GCP_start_search (struct CadetPeer *peer)
2202 const struct GNUNET_PeerIdentity *id;
2203 struct CadetTunnel *t = peer->tunnel;
2205 if (NULL != peer->search_h)
2211 if (NULL != peer->search_delayed)
2212 GCP_stop_search (peer);
2214 id = GNUNET_PEER_resolve2 (peer->id);
2215 peer->search_h = GCD_search (id, &search_handler, peer);
2219 /* Why would we search for a peer with no tunnel towards it? */
2224 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2225 || 0 == GCT_count_any_connections (t))
2227 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2233 * Stop the DHT search for new paths towards the peer: we already have
2234 * enough good connections.
2236 * @param peer Destination peer.
2239 GCP_stop_search (struct CadetPeer *peer)
2241 if (NULL != peer->search_h)
2243 GCD_search_stop (peer->search_h);
2244 peer->search_h = NULL;
2246 if (NULL != peer->search_delayed)
2248 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2249 peer->search_delayed = NULL;
2255 * Get the Full ID of a peer.
2257 * @param peer Peer to get from.
2259 * @return Full ID of peer.
2261 const struct GNUNET_PeerIdentity *
2262 GCP_get_id (const struct CadetPeer *peer)
2264 return GNUNET_PEER_resolve2 (peer->id);
2269 * Get the Short ID of a peer.
2271 * @param peer Peer to get from.
2273 * @return Short ID of peer.
2276 GCP_get_short_id (const struct CadetPeer *peer)
2285 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2291 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2294 if (NULL == t && GNUNET_YES == is_searching (peer))
2296 GCP_stop_search (peer);
2302 * Get the tunnel towards a peer.
2304 * @param peer Peer to get from.
2306 * @return Tunnel towards peer.
2308 struct CadetTunnel *
2309 GCP_get_tunnel (const struct CadetPeer *peer)
2311 return peer->tunnel;
2316 * Set the hello message.
2318 * @param peer Peer whose message to set.
2319 * @param hello Hello message.
2322 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2324 struct GNUNET_HELLO_Message *old;
2327 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2331 old = GCP_get_hello (peer);
2334 size = GNUNET_HELLO_size (hello);
2335 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2336 peer->hello = GNUNET_malloc (size);
2337 memcpy (peer->hello, hello, size);
2341 peer->hello = GNUNET_HELLO_merge (old, hello);
2342 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2343 peer->hello, GNUNET_HELLO_size (hello));
2350 * Get the hello message.
2352 * @param peer Peer whose message to get.
2354 * @return Hello message.
2356 struct GNUNET_HELLO_Message *
2357 GCP_get_hello (struct CadetPeer *peer)
2359 struct GNUNET_TIME_Absolute expiration;
2360 struct GNUNET_TIME_Relative remaining;
2362 if (NULL == peer->hello)
2365 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2366 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2367 if (0 == remaining.rel_value_us)
2369 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2370 GNUNET_STRINGS_absolute_time_to_string (expiration));
2371 GNUNET_free (peer->hello);
2379 * Try to connect to a peer on TRANSPORT level.
2381 * @param peer Peer to whom to connect.
2384 GCP_try_connect (struct CadetPeer *peer)
2386 struct GNUNET_HELLO_Message *hello;
2387 struct GNUNET_MessageHeader *mh;
2389 if (NULL == transport_handle)
2392 hello = GCP_get_hello (peer);
2396 mh = GNUNET_HELLO_get_header (hello);
2397 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2402 * Notify a peer that a link between two other peers is broken. If any path
2403 * used that link, eliminate it.
2405 * @param peer Peer affected by the change.
2406 * @param peer1 Peer whose link is broken.
2407 * @param peer2 Peer whose link is broken.
2410 GCP_notify_broken_link (struct CadetPeer *peer,
2411 struct GNUNET_PeerIdentity *peer1,
2412 struct GNUNET_PeerIdentity *peer2)
2414 struct CadetPeerPath *iter;
2415 struct CadetPeerPath *next;
2420 p1 = GNUNET_PEER_search (peer1);
2421 p2 = GNUNET_PEER_search (peer2);
2423 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2424 if (0 == p1 || 0 == p2)
2426 /* We don't even know them */
2430 for (iter = peer->path_head; NULL != iter; iter = next)
2433 for (i = 0; i < iter->length - 1; i++)
2435 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2436 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2441 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2444 path_invalidate (iter);
2452 * Count the number of known paths toward the peer.
2454 * @param peer Peer to get path info.
2456 * @return Number of known paths.
2459 GCP_count_paths (const struct CadetPeer *peer)
2461 struct CadetPeerPath *iter;
2464 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2472 * Iterate all known peers.
2474 * @param iter Iterator.
2475 * @param cls Closure for @c iter.
2478 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2481 GNUNET_CONTAINER_multipeermap_iterate (peers,
2488 * Get the static string for a peer ID.
2492 * @return Static string for it's ID.
2495 GCP_2s (const struct CadetPeer *peer)
2499 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));