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}
516 * To be called on core init/fail.
518 * @param cls Closure (config)
519 * @param identity the public identity of this peer
522 core_init (void *cls,
523 const struct GNUNET_PeerIdentity *identity)
525 const struct GNUNET_CONFIGURATION_Handle *c = cls;
528 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
529 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
531 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
532 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
533 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
534 GNUNET_CORE_disconnect (core_handle);
535 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
536 NULL, /* Closure passed to CADET functions */
537 &core_init, /* Call core_init once connected */
538 &core_connect, /* Handle connects */
539 &core_disconnect, /* remove peers on disconnects */
540 NULL, /* Don't notify about all incoming messages */
541 GNUNET_NO, /* For header only in notification */
542 NULL, /* Don't notify about all outbound messages */
543 GNUNET_NO, /* For header-only out notification */
544 core_handlers); /* Register these handlers */
553 * Core callback to write a pre-constructed data packet to core buffer
555 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
556 * @param size Number of bytes available in buf.
557 * @param buf Where the to write the message.
559 * @return number of bytes written to buf
562 send_core_data_raw (void *cls, size_t size, void *buf)
564 struct GNUNET_MessageHeader *msg = cls;
567 GNUNET_assert (NULL != msg);
568 total_size = ntohs (msg->size);
570 if (total_size > size)
575 memcpy (buf, msg, total_size);
582 * Function to send a create connection message to a peer.
584 * @param c Connection to create.
585 * @param size number of bytes available in buf
586 * @param buf where the callee should write the message
587 * @return number of bytes written to buf
590 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
592 struct GNUNET_CADET_ConnectionCreate *msg;
593 struct GNUNET_PeerIdentity *peer_ptr;
594 const struct CadetPeerPath *p = GCC_get_path (c);
601 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
603 sizeof (struct GNUNET_CADET_ConnectionCreate) +
604 p->length * sizeof (struct GNUNET_PeerIdentity);
606 if (size < size_needed || NULL == buf)
611 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
612 msg->header.size = htons (size_needed);
613 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
614 msg->cid = *GCC_get_id (c);
616 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
617 for (i = 0; i < p->length; i++)
619 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
622 LOG (GNUNET_ERROR_TYPE_DEBUG,
623 "CONNECTION CREATE (%u bytes long) sent!\n",
630 * Creates a path ack message in buf and frees all unused resources.
632 * @param c Connection to send an ACK on.
633 * @param size number of bytes available in buf
634 * @param buf where the callee should write the message
636 * @return number of bytes written to buf
639 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
641 struct GNUNET_CADET_ConnectionACK *msg = buf;
643 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
644 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
649 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
650 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
651 msg->cid = *GCC_get_id (c);
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
654 return sizeof (struct GNUNET_CADET_ConnectionACK);
658 /******************************************************************************/
659 /******************************** STATIC ***********************************/
660 /******************************************************************************/
664 * Get priority for a queued message.
666 * @param q Queued message
668 * @return CORE priority to use.
670 static enum GNUNET_CORE_Priority
671 get_priority (struct CadetPeerQueue *q)
673 enum GNUNET_CORE_Priority low;
674 enum GNUNET_CORE_Priority high;
679 return GNUNET_CORE_PRIO_BACKGROUND;
682 /* Relayed traffic has lower priority, our own traffic has higher */
683 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
685 low = GNUNET_CORE_PRIO_BEST_EFFORT;
686 high = GNUNET_CORE_PRIO_URGENT;
690 low = GNUNET_CORE_PRIO_URGENT;
691 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
694 /* Bulky payload has lower priority, control traffic has higher. */
695 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
696 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
704 * Destroy the peer_info and free any allocated resources linked to it
706 * @param peer The peer_info to destroy.
707 * @return #GNUNET_OK on success
710 peer_destroy (struct CadetPeer *peer)
712 struct GNUNET_PeerIdentity id;
713 struct CadetPeerPath *p;
714 struct CadetPeerPath *nextp;
716 GNUNET_PEER_resolve (peer->id, &id);
717 GNUNET_PEER_change_rc (peer->id, -1);
719 LOG (GNUNET_ERROR_TYPE_INFO,
720 "destroying peer %s\n",
723 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
726 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
728 GCP_stop_search (peer);
733 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
737 if (NULL != peer->tunnel)
738 GCT_destroy_empty (peer->tunnel);
739 GNUNET_free_non_null (peer->hello);
746 * Iterator over peer hash map entries to destroy the peer during shutdown.
749 * @param key current key code
750 * @param value value in the hash map
751 * @return #GNUNET_YES if we should continue to iterate,
755 shutdown_peer (void *cls,
756 const struct GNUNET_PeerIdentity *key,
759 struct CadetPeer *p = value;
760 struct CadetTunnel *t = p->tunnel;
772 * Check if peer is searching for a path (either active or delayed search).
774 * @param peer Peer to check
775 * @return #GNUNET_YES if there is a search active.
776 * #GNUNET_NO otherwise.
779 is_searching (const struct CadetPeer *peer)
781 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
782 GNUNET_NO : GNUNET_YES;
787 * @brief Start a search for a peer.
789 * @param cls Closure (Peer to search for).
790 * @param tc Task context.
793 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
795 struct CadetPeer *peer = cls;
797 peer->search_delayed = NULL;
799 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
802 GCP_start_search (peer);
807 * Returns if peer is used (has a tunnel or is neighbor).
809 * @param peer Peer to check.
810 * @return #GNUNET_YES if peer is in use.
813 peer_is_used (struct CadetPeer *peer)
815 struct CadetPeerPath *p;
817 if (NULL != peer->tunnel)
820 for (p = peer->path_head; NULL != p; p = p->next)
830 * Iterator over all the peers to get the oldest timestamp.
832 * @param cls Closure (unsued).
833 * @param key ID of the peer.
834 * @param value Peer_Info of the peer.
837 peer_get_oldest (void *cls,
838 const struct GNUNET_PeerIdentity *key,
841 struct CadetPeer *p = value;
842 struct GNUNET_TIME_Absolute *abs = cls;
844 /* Don't count active peers */
845 if (GNUNET_YES == peer_is_used (p))
848 if (abs->abs_value_us < p->last_contact.abs_value_us)
849 abs->abs_value_us = p->last_contact.abs_value_us;
856 * Iterator over all the peers to remove the oldest entry.
858 * @param cls Closure (unsued).
859 * @param key ID of the peer.
860 * @param value Peer_Info of the peer.
863 peer_timeout (void *cls,
864 const struct GNUNET_PeerIdentity *key,
867 struct CadetPeer *p = value;
868 struct GNUNET_TIME_Absolute *abs = cls;
870 LOG (GNUNET_ERROR_TYPE_WARNING,
871 "peer %s timeout\n", GNUNET_i2s (key));
873 if (p->last_contact.abs_value_us == abs->abs_value_us &&
874 GNUNET_NO == peer_is_used (p))
884 * Delete oldest unused peer.
887 peer_delete_oldest (void)
889 struct GNUNET_TIME_Absolute abs;
891 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
893 GNUNET_CONTAINER_multipeermap_iterate (peers,
896 GNUNET_CONTAINER_multipeermap_iterate (peers,
903 * Choose the best (yet unused) path towards a peer,
904 * considering the tunnel properties.
906 * @param peer The destination peer.
907 * @return Best current known path towards the peer, if any.
909 static struct CadetPeerPath *
910 peer_get_best_path (const struct CadetPeer *peer)
912 struct CadetPeerPath *best_p;
913 struct CadetPeerPath *p;
914 unsigned int best_cost;
917 best_cost = UINT_MAX;
919 for (p = peer->path_head; NULL != p; p = p->next)
921 if (GNUNET_NO == path_is_valid (p))
922 continue; /* Don't use invalid paths. */
923 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
924 continue; /* If path is already in use, skip it. */
926 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
937 * Is this queue element sendable?
939 * - All management traffic is always sendable.
940 * - For payload traffic, check the connection flow control.
942 * @param q Queue element to inspect.
943 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
946 queue_is_sendable (struct CadetPeerQueue *q)
948 /* Is PID-independent? */
951 case GNUNET_MESSAGE_TYPE_CADET_ACK:
952 case GNUNET_MESSAGE_TYPE_CADET_POLL:
953 case GNUNET_MESSAGE_TYPE_CADET_KX:
954 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
955 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
956 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
957 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
960 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
961 case GNUNET_MESSAGE_TYPE_CADET_AX:
968 return GCC_is_sendable (q->c, q->fwd);
973 * Get first sendable message.
975 * @param peer The destination peer.
977 * @return First transmittable message, if any. Otherwise, NULL.
979 static struct CadetPeerQueue *
980 peer_get_first_message (const struct CadetPeer *peer)
982 struct CadetPeerQueue *q;
984 for (q = peer->queue_head; NULL != q; q = q->next)
986 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
987 if (queue_is_sendable (q))
996 * Function to process paths received for a new peer addition. The recorded
997 * paths form the initial tunnel, which can be optimized later.
998 * Called on each result obtained for the DHT search.
1000 * @param cls closure
1004 search_handler (void *cls, const struct CadetPeerPath *path)
1006 struct CadetPeer *peer = cls;
1007 unsigned int connection_count;
1009 GCP_add_path_to_all (path, GNUNET_NO);
1011 /* Count connections */
1012 connection_count = GCT_count_connections (peer->tunnel);
1014 /* If we already have our minimum (or more) connections, it's enough */
1015 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1018 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1020 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1027 * Adjust core requested size to accomodate an ACK.
1029 * @param message_size Requested size.
1031 * @return Size enough to fit @c message_size and an ACK.
1034 get_core_size (size_t message_size)
1036 return message_size + sizeof (struct GNUNET_CADET_ACK);
1041 * Fill a core buffer with the appropriate data for the queued message.
1043 * @param queue Queue element for the message.
1044 * @param buf Core buffer to fill.
1045 * @param size Size remaining in @c buf.
1046 * @param[out] pid In case its an encrypted payload, set payload.
1048 * @return Bytes written to @c buf.
1051 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1053 struct CadetConnection *c = queue->c;
1056 switch (queue->type)
1058 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1059 *pid = GCC_get_pid (queue->c, queue->fwd);
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1061 msg_size = send_core_data_raw (queue->cls, size, buf);
1062 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1064 case GNUNET_MESSAGE_TYPE_CADET_AX:
1065 *pid = GCC_get_pid (queue->c, queue->fwd);
1066 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1067 msg_size = send_core_data_raw (queue->cls, size, buf);
1068 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1070 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1071 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1072 case GNUNET_MESSAGE_TYPE_CADET_KX:
1073 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1074 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1075 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1076 msg_size = send_core_data_raw (queue->cls, size, buf);
1078 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1079 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1080 if (GCC_is_origin (c, GNUNET_YES))
1081 msg_size = send_core_connection_create (c, size, buf);
1083 msg_size = send_core_data_raw (queue->cls, size, buf);
1085 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1086 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1087 if (GCC_is_origin (c, GNUNET_NO) ||
1088 GCC_is_origin (c, GNUNET_YES))
1090 msg_size = send_core_connection_ack (c, size, buf);
1094 msg_size = send_core_data_raw (queue->cls, size, buf);
1097 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1098 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1099 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1100 /* This should be encapsulted */
1106 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1110 GNUNET_assert (size >= msg_size);
1117 * Core callback to write a queued packet to core buffer
1119 * @param cls Closure (peer info).
1120 * @param size Number of bytes available in buf.
1121 * @param buf Where the to write the message.
1123 * @return number of bytes written to buf
1126 queue_send (void *cls, size_t size, void *buf)
1128 struct CadetPeer *peer = cls;
1129 struct CadetConnection *c;
1130 struct CadetPeerQueue *queue;
1131 struct GNUNET_TIME_Relative core_wait_time;
1132 const struct GNUNET_PeerIdentity *dst_id;
1139 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1140 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1142 GCP_2s (peer), size);
1144 /* Sanity checking */
1145 if (NULL == buf || 0 == size)
1147 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1148 peer->tmt_time.abs_value_us = 0;
1149 peer->core_transmit = NULL;
1158 peer->core_transmit = NULL;
1159 queue = peer_get_first_message (peer);
1162 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1163 peer->tmt_time.abs_value_us = 0;
1166 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1167 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1168 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1169 peer->tmt_time.abs_value_us = 0;
1171 /* Copy all possible messages to the core buffer */
1172 while (NULL != queue && rest >= queue->size)
1176 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1177 GCC_2s (c), GC_f2s(queue->fwd));
1178 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1179 queue->size, total_size, size);
1181 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1183 if (0 < drop_percent &&
1184 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1186 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1187 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1188 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1193 LOG (GNUNET_ERROR_TYPE_INFO,
1194 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1195 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1196 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1198 total_size += msg_size;
1200 dst = &dst[msg_size];
1203 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1204 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1207 queue = peer_get_first_message (peer);
1210 /* If more data in queue, send next */
1213 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1214 if (NULL == peer->core_transmit)
1216 dst_id = GNUNET_PEER_resolve2 (peer->id);
1217 peer->core_transmit =
1218 GNUNET_CORE_notify_transmit_ready (core_handle,
1219 GNUNET_NO, get_priority (queue),
1220 GNUNET_TIME_UNIT_FOREVER_REL,
1222 get_core_size (queue->size),
1225 peer->tmt_time = GNUNET_TIME_absolute_get ();
1226 queue->start_waiting = GNUNET_TIME_absolute_get ();
1230 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1232 // GCC_start_poll (); FIXME needed?
1236 // GCC_stop_poll(); FIXME needed?
1239 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1240 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1246 /******************************************************************************/
1247 /******************************** API ***********************************/
1248 /******************************************************************************/
1252 * Free a transmission that was already queued with all resources
1253 * associated to the request.
1255 * If connection was marked to be destroyed, and this was the last queued
1256 * message on it, the connection will be free'd as a result.
1258 * @param queue Queue handler to cancel.
1259 * @param clear_cls Is it necessary to free associated cls?
1260 * @param sent Was it really sent? (Could have been canceled)
1261 * @param pid PID, if relevant (was sent and was a payload message).
1263 * @return #GNUNET_YES if connection was destroyed as a result,
1264 * #GNUNET_NO otherwise.
1267 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1268 int sent, uint32_t pid)
1270 struct CadetPeer *peer;
1271 int connection_destroyed;
1274 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1275 if (GNUNET_YES == clear_cls)
1277 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1278 switch (queue->type)
1280 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1281 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1283 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1284 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1285 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1286 case GNUNET_MESSAGE_TYPE_CADET_KX:
1287 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1288 case GNUNET_MESSAGE_TYPE_CADET_AX:
1289 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1290 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1291 GNUNET_free_non_null (queue->cls);
1296 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1297 GC_m2s (queue->type));
1300 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1302 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1303 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1308 if (NULL != queue->cont)
1310 struct GNUNET_TIME_Relative wait_time;
1312 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1313 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1314 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1315 connection_destroyed = queue->cont (queue->cont_cls,
1316 queue->c, sent, queue->type, pid,
1317 queue->fwd, queue->size, wait_time);
1321 connection_destroyed = GNUNET_NO;
1324 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1326 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1327 peer->core_transmit = NULL;
1328 peer->tmt_time.abs_value_us = 0;
1331 GNUNET_free (queue);
1332 return connection_destroyed;
1337 * @brief Queue and pass message to core when possible.
1339 * @param peer Peer towards which to queue the message.
1340 * @param cls Closure (@c type dependant). It will be used by queue_send to
1341 * build the message to be sent if not already prebuilt.
1342 * @param type Type of the message, 0 for a raw message.
1343 * @param size Size of the message.
1344 * @param c Connection this message belongs to (can be NULL).
1345 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1346 * @param cont Continuation to be called once CORE has taken the message.
1347 * @param cont_cls Closure for @c cont.
1349 * @return Handle to cancel the message before it is sent. Once cont is called
1350 * message has been sent and therefore the handle is no longer valid.
1352 struct CadetPeerQueue *
1353 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1354 uint16_t payload_type, uint32_t payload_id, size_t size,
1355 struct CadetConnection *c, int fwd,
1356 GCP_sent cont, void *cont_cls)
1358 struct CadetPeerQueue *q;
1363 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1364 error_level = GNUNET_ERROR_TYPE_ERROR;
1366 error_level = GNUNET_ERROR_TYPE_INFO;
1368 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1369 GC_m2s (type), GC_m2s (payload_type), payload_id,
1370 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1372 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1374 if (NULL == peer->connections)
1376 /* We are not connected to this peer, ignore request. */
1377 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1378 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1385 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1386 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1391 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1393 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1394 GNUNET_YES : GCC_is_sendable (c, fwd);
1395 q = GNUNET_new (struct CadetPeerQueue);
1398 q->payload_type = payload_type;
1399 q->payload_id = payload_id;
1405 q->cont_cls = cont_cls;
1408 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1413 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1414 call_core = GNUNET_YES;
1417 q->start_waiting = GNUNET_TIME_absolute_get ();
1418 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1420 LOG (GNUNET_ERROR_TYPE_DEBUG,
1421 "calling core tmt rdy towards %s for %u bytes\n",
1422 GCP_2s (peer), size);
1423 peer->core_transmit =
1424 GNUNET_CORE_notify_transmit_ready (core_handle,
1425 GNUNET_NO, get_priority (q),
1426 GNUNET_TIME_UNIT_FOREVER_REL,
1427 GNUNET_PEER_resolve2 (peer->id),
1428 get_core_size (size),
1430 peer->tmt_time = GNUNET_TIME_absolute_get ();
1432 else if (GNUNET_NO == call_core)
1434 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1440 struct GNUNET_TIME_Relative elapsed;
1441 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1442 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1444 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1447 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1453 * Cancel all queued messages to a peer that belong to a certain connection.
1455 * @param peer Peer towards whom to cancel.
1456 * @param c Connection whose queued messages to cancel. Might be destroyed by
1457 * the sent continuation call.
1460 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1462 struct CadetPeerQueue *q;
1463 struct CadetPeerQueue *next;
1464 struct CadetPeerQueue *prev;
1465 int connection_destroyed;
1467 connection_destroyed = GNUNET_NO;
1468 for (q = peer->queue_head; NULL != q; q = next)
1473 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1474 GNUNET_break (GNUNET_NO == connection_destroyed);
1475 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1481 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1484 /* Get next from prev, q->next might be already freed:
1485 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1488 next = peer->queue_head;
1498 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1500 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1501 peer->core_transmit = NULL;
1502 peer->tmt_time.abs_value_us = 0;
1508 * Get the first transmittable message for a connection.
1510 * @param peer Neighboring peer.
1511 * @param c Connection.
1513 * @return First transmittable message.
1515 static struct CadetPeerQueue *
1516 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1518 struct CadetPeerQueue *q;
1520 for (q = peer->queue_head; NULL != q; q = q->next)
1524 if (queue_is_sendable (q))
1526 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1529 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1537 * Get the first message for a connection and unqueue it.
1539 * Only tunnel (or higher) level messages are unqueued. Connection specific
1540 * messages are silently destroyed upon encounter.
1542 * @param peer Neighboring peer.
1543 * @param c Connection.
1544 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1547 * @return First message for this connection.
1549 struct GNUNET_MessageHeader *
1550 GCP_connection_pop (struct CadetPeer *peer,
1551 struct CadetConnection *c,
1554 struct CadetPeerQueue *q;
1555 struct CadetPeerQueue *next;
1556 struct GNUNET_MessageHeader *msg;
1559 GNUNET_assert (NULL != destroyed);
1560 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1561 for (q = peer->queue_head; NULL != q; q = next)
1566 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1567 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1571 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1572 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1573 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1574 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1575 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1576 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1577 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1578 if (GNUNET_YES == dest)
1580 GNUNET_break (GNUNET_NO == *destroyed);
1581 *destroyed = GNUNET_YES;
1585 case GNUNET_MESSAGE_TYPE_CADET_KX:
1586 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1587 case GNUNET_MESSAGE_TYPE_CADET_AX:
1588 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1589 msg = (struct GNUNET_MessageHeader *) q->cls;
1590 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1591 if (GNUNET_YES == dest)
1593 GNUNET_break (GNUNET_NO == *destroyed);
1594 *destroyed = GNUNET_YES;
1600 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1608 * Unlock a possibly locked queue for a connection.
1610 * If there is a message that can be sent on this connection, call core for it.
1611 * Otherwise (if core transmit is already called or there is no sendable
1612 * message) do nothing.
1614 * @param peer Peer who keeps the queue.
1615 * @param c Connection whose messages to unlock.
1618 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1620 struct CadetPeerQueue *q;
1623 if (NULL != peer->core_transmit)
1625 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1626 return; /* Already unlocked */
1629 q = connection_get_first_message (peer, c);
1632 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1633 return; /* Nothing to transmit */
1637 peer->core_transmit =
1638 GNUNET_CORE_notify_transmit_ready (core_handle,
1639 GNUNET_NO, get_priority (q),
1640 GNUNET_TIME_UNIT_FOREVER_REL,
1641 GNUNET_PEER_resolve2 (peer->id),
1642 get_core_size (size),
1645 peer->tmt_time = GNUNET_TIME_absolute_get ();
1650 * Initialize the peer subsystem.
1652 * @param c Configuration.
1655 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1657 LOG (GNUNET_ERROR_TYPE_DEBUG,
1659 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1661 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1664 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1665 "CADET", "MAX_PEERS", "USING DEFAULT");
1670 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1677 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1678 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1679 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1680 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1681 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1684 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1685 NULL, /* Closure passed to CADET functions */
1686 &core_init, /* Call core_init once connected */
1687 &core_connect, /* Handle connects */
1688 &core_disconnect, /* remove peers on disconnects */
1689 NULL, /* Don't notify about all incoming messages */
1690 GNUNET_NO, /* For header only in notification */
1691 NULL, /* Don't notify about all outbound messages */
1692 GNUNET_NO, /* For header-only out notification */
1693 core_handlers); /* Register these handlers */
1695 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1697 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1698 /* Notify callbacks */
1703 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1704 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1705 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1706 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1707 transport_handle = NULL;
1712 if (NULL == core_handle)
1715 GNUNET_SCHEDULER_shutdown ();
1723 * Shut down the peer subsystem.
1728 GNUNET_CONTAINER_multipeermap_iterate (peers,
1731 if (NULL != core_handle)
1733 GNUNET_CORE_disconnect (core_handle);
1736 if (NULL != transport_handle)
1738 GNUNET_TRANSPORT_disconnect (transport_handle);
1739 transport_handle = NULL;
1741 GNUNET_PEER_change_rc (myid, -1);
1742 GNUNET_CONTAINER_multipeermap_destroy (peers);
1748 * Retrieve the CadetPeer stucture associated with the peer, create one
1749 * and insert it in the appropriate structures if the peer is not known yet.
1751 * @param peer_id Full identity of the peer.
1753 * @return Existing or newly created peer structure.
1756 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1758 struct CadetPeer *peer;
1760 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1763 peer = GNUNET_new (struct CadetPeer);
1764 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1766 peer_delete_oldest ();
1768 GNUNET_assert (GNUNET_OK ==
1769 GNUNET_CONTAINER_multipeermap_put (peers,
1772 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1773 peer->id = GNUNET_PEER_intern (peer_id);
1775 peer->last_contact = GNUNET_TIME_absolute_get ();
1782 * Retrieve the CadetPeer stucture associated with the peer, create one
1783 * and insert it in the appropriate structures if the peer is not known yet.
1785 * @param peer Short identity of the peer.
1787 * @return Existing or newly created peer structure.
1790 GCP_get_short (const GNUNET_PEER_Id peer)
1792 return GCP_get (GNUNET_PEER_resolve2 (peer));
1797 * Try to connect to a peer on transport level.
1799 * @param cls Closure (peer).
1800 * @param tc TaskContext.
1803 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1805 struct CadetPeer *peer = cls;
1807 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1810 GNUNET_TRANSPORT_try_connect (transport_handle,
1811 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1816 * Try to establish a new connection to this peer (in its tunnel).
1817 * If the peer doesn't have any path to it yet, try to get one.
1818 * If the peer already has some path, send a CREATE CONNECTION towards it.
1820 * @param peer Peer to connect to.
1823 GCP_connect (struct CadetPeer *peer)
1825 struct CadetTunnel *t;
1826 struct CadetPeerPath *p;
1827 struct CadetConnection *c;
1830 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1832 /* If we have a current hello, try to connect using it. */
1833 GCP_try_connect (peer);
1837 rerun_search = GNUNET_NO;
1839 if (NULL != peer->path_head)
1841 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1842 p = peer_get_best_path (peer);
1848 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1851 c = GCT_use_path (t, p);
1854 /* This case can happen when the path includes a first hop that is
1855 * not yet known to be connected.
1857 * This happens quite often during testing when running cadet
1858 * under valgrind: core connect notifications come very late
1859 * and the DHT result has already come and created a valid
1860 * path. In this case, the peer->connections_{pred,succ}
1861 * hashmaps will be NULL and tunnel_use_path will not be able
1862 * to create a connection from that path.
1864 * Re-running the DHT GET should give core time to callback.
1866 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1867 * updating statistics about this issue.
1869 rerun_search = GNUNET_YES;
1873 GCC_send_create (c);
1879 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1883 if (GNUNET_YES == rerun_search)
1885 struct GNUNET_TIME_Relative delay;
1887 GCP_stop_search (peer);
1888 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1889 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1894 if (GNUNET_NO == is_searching (peer))
1895 GCP_start_search (peer);
1900 * Chech whether there is a direct (core level) connection to peer.
1902 * @param peer Peer to check.
1904 * @return #GNUNET_YES if there is a direct connection.
1907 GCP_is_neighbor (const struct CadetPeer *peer)
1909 struct CadetPeerPath *path;
1911 if (NULL == peer->connections)
1914 for (path = peer->path_head; NULL != path; path = path->next)
1916 if (3 > path->length)
1920 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1926 * Create and initialize a new tunnel towards a peer, in case it has none.
1927 * In case the peer already has a tunnel, nothing is done.
1929 * Does not generate any traffic, just creates the local data structures.
1931 * @param peer Peer towards which to create the tunnel.
1934 GCP_add_tunnel (struct CadetPeer *peer)
1936 if (NULL != peer->tunnel)
1938 peer->tunnel = GCT_new (peer);
1943 * Add a connection to a neighboring peer.
1945 * Store that the peer is the first hop of the connection in one
1946 * direction and that on peer disconnect the connection must be
1947 * notified and destroyed, for it will no longer be valid.
1949 * @param peer Peer to add connection to.
1950 * @param c Connection to add.
1951 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1954 GCP_add_connection (struct CadetPeer *peer,
1955 struct CadetConnection *c,
1958 LOG (GNUNET_ERROR_TYPE_DEBUG,
1959 "adding connection %s\n",
1961 LOG (GNUNET_ERROR_TYPE_DEBUG,
1964 GNUNET_assert (NULL != peer->connections);
1965 GNUNET_assert (GNUNET_OK ==
1966 GNUNET_CONTAINER_multihashmap_put (peer->connections,
1969 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1970 LOG (GNUNET_ERROR_TYPE_DEBUG,
1971 "Peer %s has now %u connections.\n",
1973 GNUNET_CONTAINER_multihashmap_size (peer->connections));
1978 * Add the path to the peer and update the path used to reach it in case this
1981 * @param peer Destination peer to add the path to.
1982 * @param path New path to add. Last peer must be the peer in arg 1.
1983 * Path will be either used of freed if already known.
1984 * @param trusted Do we trust that this path is real?
1986 * @return path if path was taken, pointer to existing duplicate if exists
1989 struct CadetPeerPath *
1990 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
1993 struct CadetPeerPath *aux;
1997 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1998 path->length, GCP_2s (peer));
2000 if (NULL == peer || NULL == path
2001 || path->peers[path->length - 1] != peer->id)
2004 path_destroy (path);
2008 for (l = 1; l < path->length; l++)
2010 if (path->peers[l] == myid)
2012 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2013 for (l2 = 0; l2 < path->length - l; l2++)
2015 path->peers[l2] = path->peers[l + l2];
2019 path->peers = GNUNET_realloc (path->peers,
2020 path->length * sizeof (GNUNET_PEER_Id));
2024 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2026 if (2 >= path->length && GNUNET_NO == trusted)
2028 /* Only allow CORE to tell us about direct paths */
2029 path_destroy (path);
2033 l = path_get_length (path);
2036 path_destroy (path);
2040 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2041 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2043 l2 = path_get_length (aux);
2046 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2047 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2048 peer->path_tail, aux, path);
2053 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2055 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2056 path_destroy (path);
2061 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2063 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2066 if (NULL != peer->tunnel
2067 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2076 * Add the path to the origin peer and update the path used to reach it in case
2077 * this is the shortest.
2078 * The path is given in peer_info -> destination, therefore we turn the path
2079 * upside down first.
2081 * @param peer Peer to add the path to, being the origin of the path.
2082 * @param path New path to add after being inversed.
2083 * Path will be either used or freed.
2084 * @param trusted Do we trust that this path is real?
2086 * @return path if path was taken, pointer to existing duplicate if exists
2089 struct CadetPeerPath *
2090 GCP_add_path_to_origin (struct CadetPeer *peer,
2091 struct CadetPeerPath *path,
2097 return GCP_add_path (peer, path, trusted);
2102 * Adds a path to the info of all the peers in the path
2104 * @param p Path to process.
2105 * @param confirmed Whether we know if the path works or not.
2108 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2112 /* TODO: invert and add */
2113 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2114 for (i++; i < p->length; i++)
2116 struct CadetPeer *aux;
2117 struct CadetPeerPath *copy;
2119 aux = GCP_get_short (p->peers[i]);
2120 copy = path_duplicate (p);
2121 copy->length = i + 1;
2122 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2128 * Remove any path to the peer that has the extact same peers as the one given.
2130 * @param peer Peer to remove the path from.
2131 * @param path Path to remove. Is always destroyed .
2134 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2136 struct CadetPeerPath *iter;
2137 struct CadetPeerPath *next;
2139 GNUNET_assert (myid == path->peers[0]);
2140 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2142 LOG (GNUNET_ERROR_TYPE_INFO,
2143 "Removing path %p (%u) from %s\n",
2148 for (iter = peer->path_head; NULL != iter; iter = next)
2151 if (0 == path_cmp (path, iter))
2153 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2155 path_destroy (iter);
2158 path_destroy (path);
2163 * Remove a connection from a neighboring peer.
2165 * @param peer Peer to remove connection from.
2166 * @param c Connection to remove.
2169 GCP_remove_connection (struct CadetPeer *peer,
2170 const struct CadetConnection *c)
2172 LOG (GNUNET_ERROR_TYPE_DEBUG,
2173 "Removing connection %s\n",
2175 LOG (GNUNET_ERROR_TYPE_DEBUG,
2178 if ( (NULL == peer) ||
2179 (NULL == peer->connections) )
2181 GNUNET_assert (GNUNET_YES ==
2182 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2185 LOG (GNUNET_ERROR_TYPE_DEBUG,
2186 "Peer %s reamins with %u connections.\n",
2188 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2193 * Start the DHT search for new paths towards the peer: we don't have
2194 * enough good connections.
2196 * @param peer Destination peer.
2199 GCP_start_search (struct CadetPeer *peer)
2201 const struct GNUNET_PeerIdentity *id;
2202 struct CadetTunnel *t = peer->tunnel;
2204 if (NULL != peer->search_h)
2210 if (NULL != peer->search_delayed)
2211 GCP_stop_search (peer);
2213 id = GNUNET_PEER_resolve2 (peer->id);
2214 peer->search_h = GCD_search (id, &search_handler, peer);
2218 /* Why would we search for a peer with no tunnel towards it? */
2223 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2224 || 0 == GCT_count_any_connections (t))
2226 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2232 * Stop the DHT search for new paths towards the peer: we already have
2233 * enough good connections.
2235 * @param peer Destination peer.
2238 GCP_stop_search (struct CadetPeer *peer)
2240 if (NULL != peer->search_h)
2242 GCD_search_stop (peer->search_h);
2243 peer->search_h = NULL;
2245 if (NULL != peer->search_delayed)
2247 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2248 peer->search_delayed = NULL;
2254 * Get the Full ID of a peer.
2256 * @param peer Peer to get from.
2258 * @return Full ID of peer.
2260 const struct GNUNET_PeerIdentity *
2261 GCP_get_id (const struct CadetPeer *peer)
2263 return GNUNET_PEER_resolve2 (peer->id);
2268 * Get the Short ID of a peer.
2270 * @param peer Peer to get from.
2272 * @return Short ID of peer.
2275 GCP_get_short_id (const struct CadetPeer *peer)
2284 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2290 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2293 if (NULL == t && GNUNET_YES == is_searching (peer))
2295 GCP_stop_search (peer);
2301 * Get the tunnel towards a peer.
2303 * @param peer Peer to get from.
2305 * @return Tunnel towards peer.
2307 struct CadetTunnel *
2308 GCP_get_tunnel (const struct CadetPeer *peer)
2310 return peer->tunnel;
2315 * Set the hello message.
2317 * @param peer Peer whose message to set.
2318 * @param hello Hello message.
2321 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2323 struct GNUNET_HELLO_Message *old;
2326 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2330 old = GCP_get_hello (peer);
2333 size = GNUNET_HELLO_size (hello);
2334 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2335 peer->hello = GNUNET_malloc (size);
2336 memcpy (peer->hello, hello, size);
2340 peer->hello = GNUNET_HELLO_merge (old, hello);
2341 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2342 peer->hello, GNUNET_HELLO_size (hello));
2349 * Get the hello message.
2351 * @param peer Peer whose message to get.
2353 * @return Hello message.
2355 struct GNUNET_HELLO_Message *
2356 GCP_get_hello (struct CadetPeer *peer)
2358 struct GNUNET_TIME_Absolute expiration;
2359 struct GNUNET_TIME_Relative remaining;
2361 if (NULL == peer->hello)
2364 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2365 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2366 if (0 == remaining.rel_value_us)
2368 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2369 GNUNET_STRINGS_absolute_time_to_string (expiration));
2370 GNUNET_free (peer->hello);
2378 * Try to connect to a peer on TRANSPORT level.
2380 * @param peer Peer to whom to connect.
2383 GCP_try_connect (struct CadetPeer *peer)
2385 struct GNUNET_HELLO_Message *hello;
2386 struct GNUNET_MessageHeader *mh;
2388 if (NULL == transport_handle)
2391 hello = GCP_get_hello (peer);
2395 mh = GNUNET_HELLO_get_header (hello);
2396 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2401 * Notify a peer that a link between two other peers is broken. If any path
2402 * used that link, eliminate it.
2404 * @param peer Peer affected by the change.
2405 * @param peer1 Peer whose link is broken.
2406 * @param peer2 Peer whose link is broken.
2409 GCP_notify_broken_link (struct CadetPeer *peer,
2410 struct GNUNET_PeerIdentity *peer1,
2411 struct GNUNET_PeerIdentity *peer2)
2413 struct CadetPeerPath *iter;
2414 struct CadetPeerPath *next;
2419 p1 = GNUNET_PEER_search (peer1);
2420 p2 = GNUNET_PEER_search (peer2);
2422 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2423 if (0 == p1 || 0 == p2)
2425 /* We don't even know them */
2429 for (iter = peer->path_head; NULL != iter; iter = next)
2432 for (i = 0; i < iter->length - 1; i++)
2434 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2435 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2440 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2443 path_invalidate (iter);
2451 * Count the number of known paths toward the peer.
2453 * @param peer Peer to get path info.
2455 * @return Number of known paths.
2458 GCP_count_paths (const struct CadetPeer *peer)
2460 struct CadetPeerPath *iter;
2463 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2471 * Iterate all known peers.
2473 * @param iter Iterator.
2474 * @param cls Closure for @c iter.
2477 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2480 GNUNET_CONTAINER_multipeermap_iterate (peers,
2487 * Get the static string for a peer ID.
2491 * @return Static string for it's ID.
2494 GCP_2s (const struct CadetPeer *peer)
2498 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));