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 core_wait_time = GNUNET_TIME_absolute_get_duration (p->tmt_time);
267 LOG2 (level, "QQQ core called %s ago\n",
268 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
270 for (q = p->queue_head; NULL != q; q = q->next)
272 LOG2 (level, "QQQ - %s %s on %s\n",
273 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
274 LOG2 (level, "QQQ payload %s, %u\n",
275 GC_m2s (q->payload_type), q->payload_id);
276 LOG2 (level, "QQQ size: %u bytes\n", q->size);
279 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
284 * Log all kinds of info about a peer.
289 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
291 struct CadetPeerPath *path;
295 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
297 __FILE__, __FUNCTION__, __LINE__);
303 LOG2 (level, "PPP DEBUG PEER NULL\n");
307 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
308 LOG2 (level, "PPP last contact %s\n",
309 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
310 for (path = p->path_head; NULL != path; path = path->next)
315 LOG2 (level, "PPP path: %s\n", s);
319 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
320 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
322 if (NULL != p->connections)
323 conns += GNUNET_CONTAINER_multihashmap_size (p->connections);
324 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
325 queue_debug (p, level);
326 LOG2 (level, "PPP DEBUG END\n");
330 /******************************************************************************/
331 /***************************** CORE HELPERS *********************************/
332 /******************************************************************************/
336 * Iterator to notify all connections of a broken link. Mark connections
337 * to destroy after all traffic has been sent.
339 * @param cls Closure (peer disconnected).
340 * @param key Current key code (peer id).
341 * @param value Value in the hash map (connection).
343 * @return #GNUNET_YES to continue to iterate.
346 notify_broken (void *cls,
347 const struct GNUNET_HashCode *key,
350 struct CadetPeer *peer = cls;
351 struct CadetConnection *c = value;
353 LOG (GNUNET_ERROR_TYPE_DEBUG,
354 "Notifying %s due to %s\n",
357 GCC_notify_broken (c,
364 * Remove the direct path to the peer.
366 * @param peer Peer to remove the direct path from.
369 static struct CadetPeerPath *
370 pop_direct_path (struct CadetPeer *peer)
372 struct CadetPeerPath *iter;
374 for (iter = peer->path_head; NULL != iter; iter = iter->next)
376 if (2 >= iter->length)
378 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
386 /******************************************************************************/
387 /***************************** CORE CALLBACKS *********************************/
388 /******************************************************************************/
392 * Method called whenever a given peer connects.
395 * @param peer peer identity this notification is about
398 core_connect (void *cls,
399 const struct GNUNET_PeerIdentity *peer)
401 struct CadetPeer *mp;
402 struct CadetPeerPath *path;
405 GNUNET_snprintf (own_id,
408 GNUNET_i2s (&my_full_id));
412 LOG (GNUNET_ERROR_TYPE_INFO,
413 "CONNECTED %s (self)\n",
419 LOG (GNUNET_ERROR_TYPE_INFO,
420 "CONNECTED %s <= %s\n",
424 path->peers[1] = mp->id;
425 GNUNET_PEER_change_rc (mp->id, 1);
427 path->peers[0] = myid;
428 GNUNET_PEER_change_rc (myid, 1);
429 GCP_add_path (mp, path, GNUNET_YES);
430 GNUNET_STATISTICS_update (stats,
434 GNUNET_assert (NULL == mp->connections);
435 mp->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
437 if ( (NULL != GCP_get_tunnel (mp)) &&
438 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
444 * Method called whenever a peer disconnects.
447 * @param peer peer identity this notification is about
450 core_disconnect (void *cls,
451 const struct GNUNET_PeerIdentity *peer)
454 struct CadetPeerPath *direct_path;
457 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
458 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
465 LOG (GNUNET_ERROR_TYPE_INFO,
466 "DISCONNECTED %s (self)\n",
469 LOG (GNUNET_ERROR_TYPE_INFO,
470 "DISCONNECTED %s <= %s\n",
471 own_id, GNUNET_i2s (peer));
472 direct_path = pop_direct_path (p);
473 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
476 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
477 p->connections = NULL;
478 if (NULL != p->core_transmit)
480 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
481 p->core_transmit = NULL;
482 p->tmt_time.abs_value_us = 0;
484 GNUNET_STATISTICS_update (stats,
488 path_destroy (direct_path);
493 * Functions to handle messages from core
495 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
496 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
497 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
498 sizeof (struct GNUNET_CADET_ConnectionACK)},
499 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
500 sizeof (struct GNUNET_CADET_ConnectionBroken)},
501 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
502 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
503 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
504 sizeof (struct GNUNET_CADET_ACK)},
505 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
506 sizeof (struct GNUNET_CADET_Poll)},
507 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
508 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
509 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0}
514 * To be called on core init/fail.
516 * @param cls Closure (config)
517 * @param identity the public identity of this peer
520 core_init (void *cls,
521 const struct GNUNET_PeerIdentity *identity)
523 const struct GNUNET_CONFIGURATION_Handle *c = cls;
526 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
527 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
529 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
530 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
531 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
532 GNUNET_CORE_disconnect (core_handle);
533 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
534 NULL, /* Closure passed to CADET functions */
535 &core_init, /* Call core_init once connected */
536 &core_connect, /* Handle connects */
537 &core_disconnect, /* remove peers on disconnects */
538 NULL, /* Don't notify about all incoming messages */
539 GNUNET_NO, /* For header only in notification */
540 NULL, /* Don't notify about all outbound messages */
541 GNUNET_NO, /* For header-only out notification */
542 core_handlers); /* Register these handlers */
551 * Core callback to write a pre-constructed data packet to core buffer
553 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
554 * @param size Number of bytes available in buf.
555 * @param buf Where the to write the message.
557 * @return number of bytes written to buf
560 send_core_data_raw (void *cls, size_t size, void *buf)
562 struct GNUNET_MessageHeader *msg = cls;
565 GNUNET_assert (NULL != msg);
566 total_size = ntohs (msg->size);
568 if (total_size > size)
573 memcpy (buf, msg, total_size);
580 * Function to send a create connection message to a peer.
582 * @param c Connection to create.
583 * @param size number of bytes available in buf
584 * @param buf where the callee should write the message
585 * @return number of bytes written to buf
588 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
590 struct GNUNET_CADET_ConnectionCreate *msg;
591 struct GNUNET_PeerIdentity *peer_ptr;
592 const struct CadetPeerPath *p = GCC_get_path (c);
599 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
601 sizeof (struct GNUNET_CADET_ConnectionCreate) +
602 p->length * sizeof (struct GNUNET_PeerIdentity);
604 if (size < size_needed || NULL == buf)
609 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
610 msg->header.size = htons (size_needed);
611 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
612 msg->cid = *GCC_get_id (c);
614 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
615 for (i = 0; i < p->length; i++)
617 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
620 LOG (GNUNET_ERROR_TYPE_DEBUG,
621 "CONNECTION CREATE (%u bytes long) sent!\n",
628 * Creates a path ack message in buf and frees all unused resources.
630 * @param c Connection to send an ACK on.
631 * @param size number of bytes available in buf
632 * @param buf where the callee should write the message
634 * @return number of bytes written to buf
637 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
639 struct GNUNET_CADET_ConnectionACK *msg = buf;
641 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
642 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
647 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
648 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
649 msg->cid = *GCC_get_id (c);
651 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
652 return sizeof (struct GNUNET_CADET_ConnectionACK);
656 /******************************************************************************/
657 /******************************** STATIC ***********************************/
658 /******************************************************************************/
662 * Get priority for a queued message.
664 * @param q Queued message
666 * @return CORE priority to use.
668 static enum GNUNET_CORE_Priority
669 get_priority (struct CadetPeerQueue *q)
671 enum GNUNET_CORE_Priority low;
672 enum GNUNET_CORE_Priority high;
677 return GNUNET_CORE_PRIO_BACKGROUND;
680 /* Relayed traffic has lower priority, our own traffic has higher */
681 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
683 low = GNUNET_CORE_PRIO_BEST_EFFORT;
684 high = GNUNET_CORE_PRIO_URGENT;
688 low = GNUNET_CORE_PRIO_URGENT;
689 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
692 /* Bulky payload has lower priority, control traffic has higher. */
693 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
694 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
702 * Destroy the peer_info and free any allocated resources linked to it
704 * @param peer The peer_info to destroy.
705 * @return #GNUNET_OK on success
708 peer_destroy (struct CadetPeer *peer)
710 struct GNUNET_PeerIdentity id;
711 struct CadetPeerPath *p;
712 struct CadetPeerPath *nextp;
714 GNUNET_PEER_resolve (peer->id, &id);
715 GNUNET_PEER_change_rc (peer->id, -1);
717 LOG (GNUNET_ERROR_TYPE_INFO,
718 "destroying peer %s\n",
721 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
724 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
726 GCP_stop_search (peer);
731 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
735 if (NULL != peer->tunnel)
736 GCT_destroy_empty (peer->tunnel);
737 GNUNET_free_non_null (peer->hello);
744 * Iterator over peer hash map entries to destroy the peer during shutdown.
747 * @param key current key code
748 * @param value value in the hash map
749 * @return #GNUNET_YES if we should continue to iterate,
753 shutdown_peer (void *cls,
754 const struct GNUNET_PeerIdentity *key,
757 struct CadetPeer *p = value;
758 struct CadetTunnel *t = p->tunnel;
770 * Check if peer is searching for a path (either active or delayed search).
772 * @param peer Peer to check
773 * @return #GNUNET_YES if there is a search active.
774 * #GNUNET_NO otherwise.
777 is_searching (const struct CadetPeer *peer)
779 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
780 GNUNET_NO : GNUNET_YES;
785 * @brief Start a search for a peer.
787 * @param cls Closure (Peer to search for).
788 * @param tc Task context.
791 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
793 struct CadetPeer *peer = cls;
795 peer->search_delayed = NULL;
797 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
800 GCP_start_search (peer);
805 * Returns if peer is used (has a tunnel or is neighbor).
807 * @param peer Peer to check.
808 * @return #GNUNET_YES if peer is in use.
811 peer_is_used (struct CadetPeer *peer)
813 struct CadetPeerPath *p;
815 if (NULL != peer->tunnel)
818 for (p = peer->path_head; NULL != p; p = p->next)
828 * Iterator over all the peers to get the oldest timestamp.
830 * @param cls Closure (unsued).
831 * @param key ID of the peer.
832 * @param value Peer_Info of the peer.
835 peer_get_oldest (void *cls,
836 const struct GNUNET_PeerIdentity *key,
839 struct CadetPeer *p = value;
840 struct GNUNET_TIME_Absolute *abs = cls;
842 /* Don't count active peers */
843 if (GNUNET_YES == peer_is_used (p))
846 if (abs->abs_value_us < p->last_contact.abs_value_us)
847 abs->abs_value_us = p->last_contact.abs_value_us;
854 * Iterator over all the peers to remove the oldest entry.
856 * @param cls Closure (unsued).
857 * @param key ID of the peer.
858 * @param value Peer_Info of the peer.
861 peer_timeout (void *cls,
862 const struct GNUNET_PeerIdentity *key,
865 struct CadetPeer *p = value;
866 struct GNUNET_TIME_Absolute *abs = cls;
868 LOG (GNUNET_ERROR_TYPE_WARNING,
869 "peer %s timeout\n", GNUNET_i2s (key));
871 if (p->last_contact.abs_value_us == abs->abs_value_us &&
872 GNUNET_NO == peer_is_used (p))
882 * Delete oldest unused peer.
885 peer_delete_oldest (void)
887 struct GNUNET_TIME_Absolute abs;
889 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
891 GNUNET_CONTAINER_multipeermap_iterate (peers,
894 GNUNET_CONTAINER_multipeermap_iterate (peers,
901 * Choose the best (yet unused) path towards a peer,
902 * considering the tunnel properties.
904 * @param peer The destination peer.
905 * @return Best current known path towards the peer, if any.
907 static struct CadetPeerPath *
908 peer_get_best_path (const struct CadetPeer *peer)
910 struct CadetPeerPath *best_p;
911 struct CadetPeerPath *p;
912 unsigned int best_cost;
915 best_cost = UINT_MAX;
917 for (p = peer->path_head; NULL != p; p = p->next)
919 if (GNUNET_NO == path_is_valid (p))
920 continue; /* Don't use invalid paths. */
921 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
922 continue; /* If path is already in use, skip it. */
924 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
935 * Is this queue element sendable?
937 * - All management traffic is always sendable.
938 * - For payload traffic, check the connection flow control.
940 * @param q Queue element to inspect.
941 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
944 queue_is_sendable (struct CadetPeerQueue *q)
946 /* Is PID-independent? */
949 case GNUNET_MESSAGE_TYPE_CADET_ACK:
950 case GNUNET_MESSAGE_TYPE_CADET_POLL:
951 case GNUNET_MESSAGE_TYPE_CADET_KX:
952 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
953 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
954 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
955 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
958 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
959 case GNUNET_MESSAGE_TYPE_CADET_AX:
966 return GCC_is_sendable (q->c, q->fwd);
971 * Get first sendable message.
973 * @param peer The destination peer.
975 * @return First transmittable message, if any. Otherwise, NULL.
977 static struct CadetPeerQueue *
978 peer_get_first_message (const struct CadetPeer *peer)
980 struct CadetPeerQueue *q;
982 for (q = peer->queue_head; NULL != q; q = q->next)
984 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
985 if (queue_is_sendable (q))
994 * Function to process paths received for a new peer addition. The recorded
995 * paths form the initial tunnel, which can be optimized later.
996 * Called on each result obtained for the DHT search.
1002 search_handler (void *cls, const struct CadetPeerPath *path)
1004 struct CadetPeer *peer = cls;
1005 unsigned int connection_count;
1007 GCP_add_path_to_all (path, GNUNET_NO);
1009 /* Count connections */
1010 connection_count = GCT_count_connections (peer->tunnel);
1012 /* If we already have our minimum (or more) connections, it's enough */
1013 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1016 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1018 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1025 * Adjust core requested size to accomodate an ACK.
1027 * @param message_size Requested size.
1029 * @return Size enough to fit @c message_size and an ACK.
1032 get_core_size (size_t message_size)
1034 return message_size + sizeof (struct GNUNET_CADET_ACK);
1039 * Fill a core buffer with the appropriate data for the queued message.
1041 * @param queue Queue element for the message.
1042 * @param buf Core buffer to fill.
1043 * @param size Size remaining in @c buf.
1044 * @param[out] pid In case its an encrypted payload, set payload.
1046 * @return Bytes written to @c buf.
1049 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1051 struct CadetConnection *c = queue->c;
1054 switch (queue->type)
1056 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1057 *pid = GCC_get_pid (queue->c, queue->fwd);
1058 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1059 msg_size = send_core_data_raw (queue->cls, size, buf);
1060 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1062 case GNUNET_MESSAGE_TYPE_CADET_AX:
1063 *pid = GCC_get_pid (queue->c, queue->fwd);
1064 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1065 msg_size = send_core_data_raw (queue->cls, size, buf);
1066 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1068 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1069 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1070 case GNUNET_MESSAGE_TYPE_CADET_KX:
1071 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1072 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1073 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1074 msg_size = send_core_data_raw (queue->cls, size, buf);
1076 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1077 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1078 if (GCC_is_origin (c, GNUNET_YES))
1079 msg_size = send_core_connection_create (c, size, buf);
1081 msg_size = send_core_data_raw (queue->cls, size, buf);
1083 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1084 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1085 if (GCC_is_origin (c, GNUNET_NO) ||
1086 GCC_is_origin (c, GNUNET_YES))
1088 msg_size = send_core_connection_ack (c, size, buf);
1092 msg_size = send_core_data_raw (queue->cls, size, buf);
1095 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1096 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1097 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1098 /* This should be encapsulted */
1104 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1108 GNUNET_assert (size >= msg_size);
1115 * Core callback to write a queued packet to core buffer
1117 * @param cls Closure (peer info).
1118 * @param size Number of bytes available in buf.
1119 * @param buf Where the to write the message.
1121 * @return number of bytes written to buf
1124 queue_send (void *cls, size_t size, void *buf)
1126 struct CadetPeer *peer = cls;
1127 struct CadetConnection *c;
1128 struct CadetPeerQueue *queue;
1129 struct GNUNET_TIME_Relative core_wait_time;
1130 const struct GNUNET_PeerIdentity *dst_id;
1137 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1138 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1139 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1140 GCP_2s (peer), size);
1142 /* Sanity checking */
1143 if (NULL == buf || 0 == size)
1145 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1146 peer->tmt_time.abs_value_us = 0;
1147 peer->core_transmit = NULL;
1156 peer->core_transmit = NULL;
1157 queue = peer_get_first_message (peer);
1160 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1161 peer->tmt_time.abs_value_us = 0;
1164 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1165 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1166 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1167 peer->tmt_time.abs_value_us = 0;
1169 /* Copy all possible messages to the core buffer */
1170 while (NULL != queue && rest >= queue->size)
1174 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1175 GCC_2s (c), GC_f2s(queue->fwd));
1176 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1177 queue->size, total_size, size);
1179 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1181 if (0 < drop_percent &&
1182 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1184 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1185 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1186 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1191 LOG (GNUNET_ERROR_TYPE_INFO,
1192 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1193 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1194 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1196 total_size += msg_size;
1198 dst = &dst[msg_size];
1201 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1202 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1205 queue = peer_get_first_message (peer);
1208 /* If more data in queue, send next */
1211 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1212 if (NULL == peer->core_transmit)
1214 dst_id = GNUNET_PEER_resolve2 (peer->id);
1215 peer->core_transmit =
1216 GNUNET_CORE_notify_transmit_ready (core_handle,
1217 GNUNET_NO, get_priority (queue),
1218 GNUNET_TIME_UNIT_FOREVER_REL,
1220 get_core_size (queue->size),
1223 peer->tmt_time = GNUNET_TIME_absolute_get ();
1224 queue->start_waiting = GNUNET_TIME_absolute_get ();
1228 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1230 // GCC_start_poll (); FIXME needed?
1234 // GCC_stop_poll(); FIXME needed?
1237 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1238 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1244 /******************************************************************************/
1245 /******************************** API ***********************************/
1246 /******************************************************************************/
1250 * Free a transmission that was already queued with all resources
1251 * associated to the request.
1253 * If connection was marked to be destroyed, and this was the last queued
1254 * message on it, the connection will be free'd as a result.
1256 * @param queue Queue handler to cancel.
1257 * @param clear_cls Is it necessary to free associated cls?
1258 * @param sent Was it really sent? (Could have been canceled)
1259 * @param pid PID, if relevant (was sent and was a payload message).
1261 * @return #GNUNET_YES if connection was destroyed as a result,
1262 * #GNUNET_NO otherwise.
1265 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1266 int sent, uint32_t pid)
1268 struct CadetPeer *peer;
1269 int connection_destroyed;
1272 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1273 if (GNUNET_YES == clear_cls)
1275 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1276 switch (queue->type)
1278 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1279 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1281 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1282 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1283 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1284 case GNUNET_MESSAGE_TYPE_CADET_KX:
1285 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1286 case GNUNET_MESSAGE_TYPE_CADET_AX:
1287 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1288 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1289 GNUNET_free_non_null (queue->cls);
1294 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1295 GC_m2s (queue->type));
1298 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1300 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1301 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1306 if (NULL != queue->cont)
1308 struct GNUNET_TIME_Relative wait_time;
1310 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1311 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1312 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1313 connection_destroyed = queue->cont (queue->cont_cls,
1314 queue->c, sent, queue->type, pid,
1315 queue->fwd, queue->size, wait_time);
1319 connection_destroyed = GNUNET_NO;
1322 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1324 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1325 peer->core_transmit = NULL;
1326 peer->tmt_time.abs_value_us = 0;
1329 GNUNET_free (queue);
1330 return connection_destroyed;
1335 * @brief Queue and pass message to core when possible.
1337 * @param peer Peer towards which to queue the message.
1338 * @param cls Closure (@c type dependant). It will be used by queue_send to
1339 * build the message to be sent if not already prebuilt.
1340 * @param type Type of the message, 0 for a raw message.
1341 * @param size Size of the message.
1342 * @param c Connection this message belongs to (can be NULL).
1343 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1344 * @param cont Continuation to be called once CORE has taken the message.
1345 * @param cont_cls Closure for @c cont.
1347 * @return Handle to cancel the message before it is sent. Once cont is called
1348 * message has been sent and therefore the handle is no longer valid.
1350 struct CadetPeerQueue *
1351 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1352 uint16_t payload_type, uint32_t payload_id, size_t size,
1353 struct CadetConnection *c, int fwd,
1354 GCP_sent cont, void *cont_cls)
1356 struct CadetPeerQueue *q;
1361 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1362 error_level = GNUNET_ERROR_TYPE_ERROR;
1364 error_level = GNUNET_ERROR_TYPE_INFO;
1366 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1367 GC_m2s (type), GC_m2s (payload_type), payload_id,
1368 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1370 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1372 if (NULL == peer->connections)
1374 /* We are not connected to this peer, ignore request. */
1375 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1376 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1383 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1384 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1389 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1391 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1392 GNUNET_YES : GCC_is_sendable (c, fwd);
1393 q = GNUNET_new (struct CadetPeerQueue);
1396 q->payload_type = payload_type;
1397 q->payload_id = payload_id;
1403 q->cont_cls = cont_cls;
1406 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1411 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1412 call_core = GNUNET_YES;
1415 q->start_waiting = GNUNET_TIME_absolute_get ();
1416 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1418 LOG (GNUNET_ERROR_TYPE_DEBUG,
1419 "calling core tmt rdy towards %s for %u bytes\n",
1420 GCP_2s (peer), size);
1421 peer->core_transmit =
1422 GNUNET_CORE_notify_transmit_ready (core_handle,
1423 GNUNET_NO, get_priority (q),
1424 GNUNET_TIME_UNIT_FOREVER_REL,
1425 GNUNET_PEER_resolve2 (peer->id),
1426 get_core_size (size),
1428 peer->tmt_time = GNUNET_TIME_absolute_get ();
1430 else if (GNUNET_NO == call_core)
1432 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1438 struct GNUNET_TIME_Relative elapsed;
1439 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1440 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1442 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1445 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1451 * Cancel all queued messages to a peer that belong to a certain connection.
1453 * @param peer Peer towards whom to cancel.
1454 * @param c Connection whose queued messages to cancel. Might be destroyed by
1455 * the sent continuation call.
1458 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1460 struct CadetPeerQueue *q;
1461 struct CadetPeerQueue *next;
1462 struct CadetPeerQueue *prev;
1463 int connection_destroyed;
1465 connection_destroyed = GNUNET_NO;
1466 for (q = peer->queue_head; NULL != q; q = next)
1471 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1472 GNUNET_break (GNUNET_NO == connection_destroyed);
1473 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1479 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1482 /* Get next from prev, q->next might be already freed:
1483 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1486 next = peer->queue_head;
1496 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1498 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1499 peer->core_transmit = NULL;
1500 peer->tmt_time.abs_value_us = 0;
1506 * Get the first transmittable message for a connection.
1508 * @param peer Neighboring peer.
1509 * @param c Connection.
1511 * @return First transmittable message.
1513 static struct CadetPeerQueue *
1514 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1516 struct CadetPeerQueue *q;
1518 for (q = peer->queue_head; NULL != q; q = q->next)
1522 if (queue_is_sendable (q))
1524 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1527 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1535 * Get the first message for a connection and unqueue it.
1537 * Only tunnel (or higher) level messages are unqueued. Connection specific
1538 * messages are silently destroyed upon encounter.
1540 * @param peer Neighboring peer.
1541 * @param c Connection.
1542 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1545 * @return First message for this connection.
1547 struct GNUNET_MessageHeader *
1548 GCP_connection_pop (struct CadetPeer *peer,
1549 struct CadetConnection *c,
1552 struct CadetPeerQueue *q;
1553 struct CadetPeerQueue *next;
1554 struct GNUNET_MessageHeader *msg;
1557 GNUNET_assert (NULL != destroyed);
1558 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1559 for (q = peer->queue_head; NULL != q; q = next)
1564 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1565 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1569 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1570 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1571 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1572 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1573 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1574 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1575 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1576 if (GNUNET_YES == dest)
1578 GNUNET_break (GNUNET_NO == *destroyed);
1579 *destroyed = GNUNET_YES;
1583 case GNUNET_MESSAGE_TYPE_CADET_KX:
1584 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1585 case GNUNET_MESSAGE_TYPE_CADET_AX:
1586 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1587 msg = (struct GNUNET_MessageHeader *) q->cls;
1588 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1589 if (GNUNET_YES == dest)
1591 GNUNET_break (GNUNET_NO == *destroyed);
1592 *destroyed = GNUNET_YES;
1598 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1606 * Unlock a possibly locked queue for a connection.
1608 * If there is a message that can be sent on this connection, call core for it.
1609 * Otherwise (if core transmit is already called or there is no sendable
1610 * message) do nothing.
1612 * @param peer Peer who keeps the queue.
1613 * @param c Connection whose messages to unlock.
1616 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1618 struct CadetPeerQueue *q;
1621 if (NULL != peer->core_transmit)
1623 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1624 return; /* Already unlocked */
1627 q = connection_get_first_message (peer, c);
1630 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1631 return; /* Nothing to transmit */
1635 peer->core_transmit =
1636 GNUNET_CORE_notify_transmit_ready (core_handle,
1637 GNUNET_NO, get_priority (q),
1638 GNUNET_TIME_UNIT_FOREVER_REL,
1639 GNUNET_PEER_resolve2 (peer->id),
1640 get_core_size (size),
1643 peer->tmt_time = GNUNET_TIME_absolute_get ();
1648 * Initialize the peer subsystem.
1650 * @param c Configuration.
1653 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1655 LOG (GNUNET_ERROR_TYPE_DEBUG,
1657 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1659 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1662 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1663 "CADET", "MAX_PEERS", "USING DEFAULT");
1668 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1675 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1676 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1677 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1678 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1679 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1682 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1683 NULL, /* Closure passed to CADET functions */
1684 &core_init, /* Call core_init once connected */
1685 &core_connect, /* Handle connects */
1686 &core_disconnect, /* remove peers on disconnects */
1687 NULL, /* Don't notify about all incoming messages */
1688 GNUNET_NO, /* For header only in notification */
1689 NULL, /* Don't notify about all outbound messages */
1690 GNUNET_NO, /* For header-only out notification */
1691 core_handlers); /* Register these handlers */
1693 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1695 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1696 /* Notify callbacks */
1701 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1702 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1703 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1704 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1705 transport_handle = NULL;
1710 if (NULL == core_handle)
1713 GNUNET_SCHEDULER_shutdown ();
1721 * Shut down the peer subsystem.
1726 GNUNET_CONTAINER_multipeermap_iterate (peers,
1729 if (NULL != core_handle)
1731 GNUNET_CORE_disconnect (core_handle);
1734 if (NULL != transport_handle)
1736 GNUNET_TRANSPORT_disconnect (transport_handle);
1737 transport_handle = NULL;
1739 GNUNET_PEER_change_rc (myid, -1);
1740 GNUNET_CONTAINER_multipeermap_destroy (peers);
1746 * Retrieve the CadetPeer stucture associated with the peer, create one
1747 * and insert it in the appropriate structures if the peer is not known yet.
1749 * @param peer_id Full identity of the peer.
1751 * @return Existing or newly created peer structure.
1754 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1756 struct CadetPeer *peer;
1758 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1761 peer = GNUNET_new (struct CadetPeer);
1762 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1764 peer_delete_oldest ();
1766 GNUNET_assert (GNUNET_OK ==
1767 GNUNET_CONTAINER_multipeermap_put (peers,
1770 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1771 peer->id = GNUNET_PEER_intern (peer_id);
1773 peer->last_contact = GNUNET_TIME_absolute_get ();
1780 * Retrieve the CadetPeer stucture associated with the peer, create one
1781 * and insert it in the appropriate structures if the peer is not known yet.
1783 * @param peer Short identity of the peer.
1785 * @return Existing or newly created peer structure.
1788 GCP_get_short (const GNUNET_PEER_Id peer)
1790 return GCP_get (GNUNET_PEER_resolve2 (peer));
1795 * Try to connect to a peer on transport level.
1797 * @param cls Closure (peer).
1798 * @param tc TaskContext.
1801 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1803 struct CadetPeer *peer = cls;
1805 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1808 GNUNET_TRANSPORT_try_connect (transport_handle,
1809 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1814 * Try to establish a new connection to this peer (in its tunnel).
1815 * If the peer doesn't have any path to it yet, try to get one.
1816 * If the peer already has some path, send a CREATE CONNECTION towards it.
1818 * @param peer Peer to connect to.
1821 GCP_connect (struct CadetPeer *peer)
1823 struct CadetTunnel *t;
1824 struct CadetPeerPath *p;
1825 struct CadetConnection *c;
1828 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1830 /* If we have a current hello, try to connect using it. */
1831 GCP_try_connect (peer);
1835 rerun_search = GNUNET_NO;
1837 if (NULL != peer->path_head)
1839 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1840 p = peer_get_best_path (peer);
1846 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1849 c = GCT_use_path (t, p);
1852 /* This case can happen when the path includes a first hop that is
1853 * not yet known to be connected.
1855 * This happens quite often during testing when running cadet
1856 * under valgrind: core connect notifications come very late
1857 * and the DHT result has already come and created a valid
1858 * path. In this case, the peer->connections_{pred,succ}
1859 * hashmaps will be NULL and tunnel_use_path will not be able
1860 * to create a connection from that path.
1862 * Re-running the DHT GET should give core time to callback.
1864 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1865 * updating statistics about this issue.
1867 rerun_search = GNUNET_YES;
1871 GCC_send_create (c);
1877 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1881 if (GNUNET_YES == rerun_search)
1883 struct GNUNET_TIME_Relative delay;
1885 GCP_stop_search (peer);
1886 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1887 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1892 if (GNUNET_NO == is_searching (peer))
1893 GCP_start_search (peer);
1898 * Chech whether there is a direct (core level) connection to peer.
1900 * @param peer Peer to check.
1902 * @return #GNUNET_YES if there is a direct connection.
1905 GCP_is_neighbor (const struct CadetPeer *peer)
1907 struct CadetPeerPath *path;
1909 if (NULL == peer->connections)
1912 for (path = peer->path_head; NULL != path; path = path->next)
1914 if (3 > path->length)
1918 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1924 * Create and initialize a new tunnel towards a peer, in case it has none.
1925 * In case the peer already has a tunnel, nothing is done.
1927 * Does not generate any traffic, just creates the local data structures.
1929 * @param peer Peer towards which to create the tunnel.
1932 GCP_add_tunnel (struct CadetPeer *peer)
1934 if (NULL != peer->tunnel)
1936 peer->tunnel = GCT_new (peer);
1941 * Add a connection to a neighboring peer.
1943 * Store that the peer is the first hop of the connection in one
1944 * direction and that on peer disconnect the connection must be
1945 * notified and destroyed, for it will no longer be valid.
1947 * @param peer Peer to add connection to.
1948 * @param c Connection to add.
1949 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1952 GCP_add_connection (struct CadetPeer *peer,
1953 struct CadetConnection *c,
1956 LOG (GNUNET_ERROR_TYPE_DEBUG,
1957 "adding connection %s\n",
1959 LOG (GNUNET_ERROR_TYPE_DEBUG,
1962 GNUNET_assert (NULL != peer->connections);
1963 GNUNET_assert (GNUNET_OK ==
1964 GNUNET_CONTAINER_multihashmap_put (peer->connections,
1967 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1968 LOG (GNUNET_ERROR_TYPE_DEBUG,
1969 "Peer %s has now %u connections.\n",
1971 GNUNET_CONTAINER_multihashmap_size (peer->connections));
1976 * Add the path to the peer and update the path used to reach it in case this
1979 * @param peer Destination peer to add the path to.
1980 * @param path New path to add. Last peer must be the peer in arg 1.
1981 * Path will be either used of freed if already known.
1982 * @param trusted Do we trust that this path is real?
1984 * @return path if path was taken, pointer to existing duplicate if exists
1987 struct CadetPeerPath *
1988 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
1991 struct CadetPeerPath *aux;
1995 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1996 path->length, GCP_2s (peer));
1998 if (NULL == peer || NULL == path
1999 || path->peers[path->length - 1] != peer->id)
2002 path_destroy (path);
2006 for (l = 1; l < path->length; l++)
2008 if (path->peers[l] == myid)
2010 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2011 for (l2 = 0; l2 < path->length - l; l2++)
2013 path->peers[l2] = path->peers[l + l2];
2017 path->peers = GNUNET_realloc (path->peers,
2018 path->length * sizeof (GNUNET_PEER_Id));
2022 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2024 if (2 >= path->length && GNUNET_NO == trusted)
2026 /* Only allow CORE to tell us about direct paths */
2027 path_destroy (path);
2031 l = path_get_length (path);
2034 path_destroy (path);
2038 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2039 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2041 l2 = path_get_length (aux);
2044 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2045 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2046 peer->path_tail, aux, path);
2051 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2053 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2054 path_destroy (path);
2059 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2061 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2064 if (NULL != peer->tunnel
2065 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2074 * Add the path to the origin peer and update the path used to reach it in case
2075 * this is the shortest.
2076 * The path is given in peer_info -> destination, therefore we turn the path
2077 * upside down first.
2079 * @param peer Peer to add the path to, being the origin of the path.
2080 * @param path New path to add after being inversed.
2081 * Path will be either used or freed.
2082 * @param trusted Do we trust that this path is real?
2084 * @return path if path was taken, pointer to existing duplicate if exists
2087 struct CadetPeerPath *
2088 GCP_add_path_to_origin (struct CadetPeer *peer,
2089 struct CadetPeerPath *path,
2095 return GCP_add_path (peer, path, trusted);
2100 * Adds a path to the info of all the peers in the path
2102 * @param p Path to process.
2103 * @param confirmed Whether we know if the path works or not.
2106 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2110 /* TODO: invert and add */
2111 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2112 for (i++; i < p->length; i++)
2114 struct CadetPeer *aux;
2115 struct CadetPeerPath *copy;
2117 aux = GCP_get_short (p->peers[i]);
2118 copy = path_duplicate (p);
2119 copy->length = i + 1;
2120 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2126 * Remove any path to the peer that has the extact same peers as the one given.
2128 * @param peer Peer to remove the path from.
2129 * @param path Path to remove. Is always destroyed .
2132 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2134 struct CadetPeerPath *iter;
2135 struct CadetPeerPath *next;
2137 GNUNET_assert (myid == path->peers[0]);
2138 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2140 LOG (GNUNET_ERROR_TYPE_INFO,
2141 "Removing path %p (%u) from %s\n",
2146 for (iter = peer->path_head; NULL != iter; iter = next)
2149 if (0 == path_cmp (path, iter))
2151 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2153 path_destroy (iter);
2156 path_destroy (path);
2161 * Remove a connection from a neighboring peer.
2163 * @param peer Peer to remove connection from.
2164 * @param c Connection to remove.
2167 GCP_remove_connection (struct CadetPeer *peer,
2168 const struct CadetConnection *c)
2170 LOG (GNUNET_ERROR_TYPE_DEBUG,
2171 "Removing connection %s\n",
2173 LOG (GNUNET_ERROR_TYPE_DEBUG,
2176 if ( (NULL == peer) ||
2177 (NULL == peer->connections) )
2179 GNUNET_assert (GNUNET_YES ==
2180 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2183 LOG (GNUNET_ERROR_TYPE_DEBUG,
2184 "Peer %s reamins with %u connections.\n",
2186 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2191 * Start the DHT search for new paths towards the peer: we don't have
2192 * enough good connections.
2194 * @param peer Destination peer.
2197 GCP_start_search (struct CadetPeer *peer)
2199 const struct GNUNET_PeerIdentity *id;
2200 struct CadetTunnel *t = peer->tunnel;
2202 if (NULL != peer->search_h)
2208 if (NULL != peer->search_delayed)
2209 GCP_stop_search (peer);
2211 id = GNUNET_PEER_resolve2 (peer->id);
2212 peer->search_h = GCD_search (id, &search_handler, peer);
2216 /* Why would we search for a peer with no tunnel towards it? */
2221 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2222 || 0 == GCT_count_any_connections (t))
2224 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2230 * Stop the DHT search for new paths towards the peer: we already have
2231 * enough good connections.
2233 * @param peer Destination peer.
2236 GCP_stop_search (struct CadetPeer *peer)
2238 if (NULL != peer->search_h)
2240 GCD_search_stop (peer->search_h);
2241 peer->search_h = NULL;
2243 if (NULL != peer->search_delayed)
2245 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2246 peer->search_delayed = NULL;
2252 * Get the Full ID of a peer.
2254 * @param peer Peer to get from.
2256 * @return Full ID of peer.
2258 const struct GNUNET_PeerIdentity *
2259 GCP_get_id (const struct CadetPeer *peer)
2261 return GNUNET_PEER_resolve2 (peer->id);
2266 * Get the Short ID of a peer.
2268 * @param peer Peer to get from.
2270 * @return Short ID of peer.
2273 GCP_get_short_id (const struct CadetPeer *peer)
2282 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2288 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2291 if (NULL == t && GNUNET_YES == is_searching (peer))
2293 GCP_stop_search (peer);
2299 * Get the tunnel towards a peer.
2301 * @param peer Peer to get from.
2303 * @return Tunnel towards peer.
2305 struct CadetTunnel *
2306 GCP_get_tunnel (const struct CadetPeer *peer)
2308 return peer->tunnel;
2313 * Set the hello message.
2315 * @param peer Peer whose message to set.
2316 * @param hello Hello message.
2319 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2321 struct GNUNET_HELLO_Message *old;
2324 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2328 old = GCP_get_hello (peer);
2331 size = GNUNET_HELLO_size (hello);
2332 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2333 peer->hello = GNUNET_malloc (size);
2334 memcpy (peer->hello, hello, size);
2338 peer->hello = GNUNET_HELLO_merge (old, hello);
2339 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2340 peer->hello, GNUNET_HELLO_size (hello));
2347 * Get the hello message.
2349 * @param peer Peer whose message to get.
2351 * @return Hello message.
2353 struct GNUNET_HELLO_Message *
2354 GCP_get_hello (struct CadetPeer *peer)
2356 struct GNUNET_TIME_Absolute expiration;
2357 struct GNUNET_TIME_Relative remaining;
2359 if (NULL == peer->hello)
2362 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2363 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2364 if (0 == remaining.rel_value_us)
2366 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2367 GNUNET_STRINGS_absolute_time_to_string (expiration));
2368 GNUNET_free (peer->hello);
2376 * Try to connect to a peer on TRANSPORT level.
2378 * @param peer Peer to whom to connect.
2381 GCP_try_connect (struct CadetPeer *peer)
2383 struct GNUNET_HELLO_Message *hello;
2384 struct GNUNET_MessageHeader *mh;
2386 if (NULL == transport_handle)
2389 hello = GCP_get_hello (peer);
2393 mh = GNUNET_HELLO_get_header (hello);
2394 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2399 * Notify a peer that a link between two other peers is broken. If any path
2400 * used that link, eliminate it.
2402 * @param peer Peer affected by the change.
2403 * @param peer1 Peer whose link is broken.
2404 * @param peer2 Peer whose link is broken.
2407 GCP_notify_broken_link (struct CadetPeer *peer,
2408 struct GNUNET_PeerIdentity *peer1,
2409 struct GNUNET_PeerIdentity *peer2)
2411 struct CadetPeerPath *iter;
2412 struct CadetPeerPath *next;
2417 p1 = GNUNET_PEER_search (peer1);
2418 p2 = GNUNET_PEER_search (peer2);
2420 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2421 if (0 == p1 || 0 == p2)
2423 /* We don't even know them */
2427 for (iter = peer->path_head; NULL != iter; iter = next)
2430 for (i = 0; i < iter->length - 1; i++)
2432 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2433 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2438 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2441 path_invalidate (iter);
2449 * Count the number of known paths toward the peer.
2451 * @param peer Peer to get path info.
2453 * @return Number of known paths.
2456 GCP_count_paths (const struct CadetPeer *peer)
2458 struct CadetPeerPath *iter;
2461 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2469 * Iterate all known peers.
2471 * @param iter Iterator.
2472 * @param cls Closure for @c iter.
2475 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2478 GNUNET_CONTAINER_multipeermap_iterate (peers,
2485 * Get the static string for a peer ID.
2489 * @return Static string for it's ID.
2492 GCP_2s (const struct CadetPeer *peer)
2496 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));