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., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, 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;
242 static int in_shutdown;
245 /******************************************************************************/
246 /***************************** DEBUG *********************************/
247 /******************************************************************************/
250 * Log all kinds of info about the queueing status of a peer.
252 * @param p Peer whose queue to show.
253 * @param level Error level to use for logging.
256 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
258 struct GNUNET_TIME_Relative core_wait_time;
259 struct CadetPeerQueue *q;
262 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
264 __FILE__, __FUNCTION__, __LINE__);
268 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
269 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
270 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
271 if (NULL != p->core_transmit)
273 core_wait_time = GNUNET_TIME_absolute_get_duration (p->tmt_time);
274 LOG2 (level, "QQQ core called %s ago\n",
275 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
277 for (q = p->queue_head; NULL != q; q = q->next)
279 LOG2 (level, "QQQ - %s %s on %s\n",
280 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
281 LOG2 (level, "QQQ payload %s, %u\n",
282 GC_m2s (q->payload_type), q->payload_id);
283 LOG2 (level, "QQQ size: %u bytes\n", q->size);
286 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
291 * Log all kinds of info about a peer.
296 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
298 struct CadetPeerPath *path;
302 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
304 __FILE__, __FUNCTION__, __LINE__);
310 LOG2 (level, "PPP DEBUG PEER NULL\n");
314 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
315 LOG2 (level, "PPP last contact %s\n",
316 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
317 for (path = p->path_head; NULL != path; path = path->next)
322 LOG2 (level, "PPP path: %s\n", s);
326 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
327 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
329 if (NULL != p->connections)
330 conns += GNUNET_CONTAINER_multihashmap_size (p->connections);
331 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
332 queue_debug (p, level);
333 LOG2 (level, "PPP DEBUG END\n");
337 /******************************************************************************/
338 /***************************** CORE HELPERS *********************************/
339 /******************************************************************************/
343 * Iterator to notify all connections of a broken link. Mark connections
344 * to destroy after all traffic has been sent.
346 * @param cls Closure (peer disconnected).
347 * @param key Current key code (peer id).
348 * @param value Value in the hash map (connection).
350 * @return #GNUNET_YES to continue to iterate.
353 notify_broken (void *cls,
354 const struct GNUNET_HashCode *key,
357 struct CadetPeer *peer = cls;
358 struct CadetConnection *c = value;
360 LOG (GNUNET_ERROR_TYPE_DEBUG,
361 "Notifying %s due to %s\n",
364 GCC_notify_broken (c,
371 * Remove the direct path to the peer.
373 * @param peer Peer to remove the direct path from.
376 static struct CadetPeerPath *
377 pop_direct_path (struct CadetPeer *peer)
379 struct CadetPeerPath *iter;
381 for (iter = peer->path_head; NULL != iter; iter = iter->next)
383 if (2 >= iter->length)
385 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
393 /******************************************************************************/
394 /***************************** CORE CALLBACKS *********************************/
395 /******************************************************************************/
399 * Method called whenever a given peer connects.
402 * @param peer peer identity this notification is about
405 core_connect (void *cls,
406 const struct GNUNET_PeerIdentity *peer)
408 struct CadetPeer *mp;
409 struct CadetPeerPath *path;
412 GNUNET_snprintf (own_id,
415 GNUNET_i2s (&my_full_id));
419 LOG (GNUNET_ERROR_TYPE_INFO,
420 "CONNECTED %s (self)\n",
426 LOG (GNUNET_ERROR_TYPE_INFO,
427 "CONNECTED %s <= %s\n",
431 path->peers[1] = mp->id;
432 GNUNET_PEER_change_rc (mp->id, 1);
434 path->peers[0] = myid;
435 GNUNET_PEER_change_rc (myid, 1);
436 GCP_add_path (mp, path, GNUNET_YES);
437 GNUNET_STATISTICS_update (stats,
441 GNUNET_assert (NULL == mp->connections);
442 mp->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
444 if ( (NULL != GCP_get_tunnel (mp)) &&
445 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
451 * Method called whenever a peer disconnects.
454 * @param peer peer identity this notification is about
457 core_disconnect (void *cls,
458 const struct GNUNET_PeerIdentity *peer)
461 struct CadetPeerPath *direct_path;
464 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
465 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
468 GNUNET_break (GNUNET_YES == in_shutdown);
472 LOG (GNUNET_ERROR_TYPE_INFO,
473 "DISCONNECTED %s (self)\n",
476 LOG (GNUNET_ERROR_TYPE_INFO,
477 "DISCONNECTED %s <= %s\n",
478 own_id, GNUNET_i2s (peer));
479 direct_path = pop_direct_path (p);
480 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
483 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
484 p->connections = NULL;
485 if (NULL != p->core_transmit)
487 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
488 p->core_transmit = NULL;
489 p->tmt_time.abs_value_us = 0;
491 GNUNET_STATISTICS_update (stats,
495 path_destroy (direct_path);
500 * Functions to handle messages from core
502 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
503 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
504 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
505 sizeof (struct GNUNET_CADET_ConnectionACK)},
506 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
507 sizeof (struct GNUNET_CADET_ConnectionBroken)},
508 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
509 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
510 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
511 sizeof (struct GNUNET_CADET_ACK)},
512 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
513 sizeof (struct GNUNET_CADET_Poll)},
514 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
515 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
516 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
522 * To be called on core init/fail.
524 * @param cls Closure (config)
525 * @param identity the public identity of this peer
528 core_init (void *cls,
529 const struct GNUNET_PeerIdentity *identity)
531 const struct GNUNET_CONFIGURATION_Handle *c = cls;
534 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
535 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
537 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
538 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
539 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
540 GNUNET_CORE_disconnect (core_handle);
541 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
542 NULL, /* Closure passed to CADET functions */
543 &core_init, /* Call core_init once connected */
544 &core_connect, /* Handle connects */
545 &core_disconnect, /* remove peers on disconnects */
546 NULL, /* Don't notify about all incoming messages */
547 GNUNET_NO, /* For header only in notification */
548 NULL, /* Don't notify about all outbound messages */
549 GNUNET_NO, /* For header-only out notification */
550 core_handlers); /* Register these handlers */
559 * Core callback to write a pre-constructed data packet to core buffer
561 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
562 * @param size Number of bytes available in buf.
563 * @param buf Where the to write the message.
565 * @return number of bytes written to buf
568 send_core_data_raw (void *cls, size_t size, void *buf)
570 struct GNUNET_MessageHeader *msg = cls;
573 GNUNET_assert (NULL != msg);
574 total_size = ntohs (msg->size);
576 if (total_size > size)
581 memcpy (buf, msg, total_size);
588 * Function to send a create connection message to a peer.
590 * @param c Connection to create.
591 * @param size number of bytes available in buf
592 * @param buf where the callee should write the message
593 * @return number of bytes written to buf
596 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
598 struct GNUNET_CADET_ConnectionCreate *msg;
599 struct GNUNET_PeerIdentity *peer_ptr;
600 const struct CadetPeerPath *p = GCC_get_path (c);
607 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
609 sizeof (struct GNUNET_CADET_ConnectionCreate) +
610 p->length * sizeof (struct GNUNET_PeerIdentity);
612 if (size < size_needed || NULL == buf)
617 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
618 msg->header.size = htons (size_needed);
619 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
620 msg->cid = *GCC_get_id (c);
622 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
623 for (i = 0; i < p->length; i++)
625 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
628 LOG (GNUNET_ERROR_TYPE_DEBUG,
629 "CONNECTION CREATE (%u bytes long) sent!\n",
636 * Creates a path ack message in buf and frees all unused resources.
638 * @param c Connection to send an ACK on.
639 * @param size number of bytes available in buf
640 * @param buf where the callee should write the message
642 * @return number of bytes written to buf
645 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
647 struct GNUNET_CADET_ConnectionACK *msg = buf;
649 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
650 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
655 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
656 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
657 msg->cid = *GCC_get_id (c);
659 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
660 return sizeof (struct GNUNET_CADET_ConnectionACK);
664 /******************************************************************************/
665 /******************************** STATIC ***********************************/
666 /******************************************************************************/
670 * Get priority for a queued message.
672 * @param q Queued message
674 * @return CORE priority to use.
676 static enum GNUNET_CORE_Priority
677 get_priority (struct CadetPeerQueue *q)
679 enum GNUNET_CORE_Priority low;
680 enum GNUNET_CORE_Priority high;
685 return GNUNET_CORE_PRIO_BACKGROUND;
688 /* Relayed traffic has lower priority, our own traffic has higher */
689 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
691 low = GNUNET_CORE_PRIO_BEST_EFFORT;
692 high = GNUNET_CORE_PRIO_URGENT;
696 low = GNUNET_CORE_PRIO_URGENT;
697 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
700 /* Bulky payload has lower priority, control traffic has higher. */
701 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
702 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
710 * Destroy the peer_info and free any allocated resources linked to it
712 * @param peer The peer_info to destroy.
713 * @return #GNUNET_OK on success
716 peer_destroy (struct CadetPeer *peer)
718 struct GNUNET_PeerIdentity id;
719 struct CadetPeerPath *p;
720 struct CadetPeerPath *nextp;
722 GNUNET_PEER_resolve (peer->id, &id);
723 GNUNET_PEER_change_rc (peer->id, -1);
725 LOG (GNUNET_ERROR_TYPE_INFO,
726 "destroying peer %s\n",
729 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
732 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
734 GCP_stop_search (peer);
739 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
743 if (NULL != peer->tunnel)
744 GCT_destroy_empty (peer->tunnel);
745 if (NULL != peer->connections)
747 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
748 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
750 GNUNET_free_non_null (peer->hello);
757 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
760 * @param key current key code
761 * @param value value in the hash map
762 * @return #GNUNET_YES if we should continue to iterate,
766 shutdown_peer (void *cls,
767 const struct GNUNET_PeerIdentity *key,
770 struct CadetPeer *p = value;
771 struct CadetTunnel *t = p->tunnel;
783 * Check if peer is searching for a path (either active or delayed search).
785 * @param peer Peer to check
786 * @return #GNUNET_YES if there is a search active.
787 * #GNUNET_NO otherwise.
790 is_searching (const struct CadetPeer *peer)
792 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
793 GNUNET_NO : GNUNET_YES;
798 * @brief Start a search for a peer.
800 * @param cls Closure (Peer to search for).
801 * @param tc Task context.
804 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
806 struct CadetPeer *peer = cls;
808 peer->search_delayed = NULL;
810 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
813 GCP_start_search (peer);
818 * Returns if peer is used (has a tunnel or is neighbor).
820 * @param peer Peer to check.
821 * @return #GNUNET_YES if peer is in use.
824 peer_is_used (struct CadetPeer *peer)
826 struct CadetPeerPath *p;
828 if (NULL != peer->tunnel)
831 for (p = peer->path_head; NULL != p; p = p->next)
841 * Iterator over all the peers to get the oldest timestamp.
843 * @param cls Closure (unsued).
844 * @param key ID of the peer.
845 * @param value Peer_Info of the peer.
848 peer_get_oldest (void *cls,
849 const struct GNUNET_PeerIdentity *key,
852 struct CadetPeer *p = value;
853 struct GNUNET_TIME_Absolute *abs = cls;
855 /* Don't count active peers */
856 if (GNUNET_YES == peer_is_used (p))
859 if (abs->abs_value_us < p->last_contact.abs_value_us)
860 abs->abs_value_us = p->last_contact.abs_value_us;
867 * Iterator over all the peers to remove the oldest entry.
869 * @param cls Closure (unsued).
870 * @param key ID of the peer.
871 * @param value Peer_Info of the peer.
874 peer_timeout (void *cls,
875 const struct GNUNET_PeerIdentity *key,
878 struct CadetPeer *p = value;
879 struct GNUNET_TIME_Absolute *abs = cls;
881 LOG (GNUNET_ERROR_TYPE_WARNING,
882 "peer %s timeout\n", GNUNET_i2s (key));
884 if (p->last_contact.abs_value_us == abs->abs_value_us &&
885 GNUNET_NO == peer_is_used (p))
895 * Delete oldest unused peer.
898 peer_delete_oldest (void)
900 struct GNUNET_TIME_Absolute abs;
902 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
904 GNUNET_CONTAINER_multipeermap_iterate (peers,
907 GNUNET_CONTAINER_multipeermap_iterate (peers,
914 * Choose the best (yet unused) path towards a peer,
915 * considering the tunnel properties.
917 * @param peer The destination peer.
918 * @return Best current known path towards the peer, if any.
920 static struct CadetPeerPath *
921 peer_get_best_path (const struct CadetPeer *peer)
923 struct CadetPeerPath *best_p;
924 struct CadetPeerPath *p;
925 unsigned int best_cost;
928 best_cost = UINT_MAX;
930 for (p = peer->path_head; NULL != p; p = p->next)
932 if (GNUNET_NO == path_is_valid (p))
933 continue; /* Don't use invalid paths. */
934 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
935 continue; /* If path is already in use, skip it. */
937 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
948 * Is this queue element sendable?
950 * - All management traffic is always sendable.
951 * - For payload traffic, check the connection flow control.
953 * @param q Queue element to inspect.
954 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
957 queue_is_sendable (struct CadetPeerQueue *q)
959 /* Is PID-independent? */
962 case GNUNET_MESSAGE_TYPE_CADET_ACK:
963 case GNUNET_MESSAGE_TYPE_CADET_POLL:
964 case GNUNET_MESSAGE_TYPE_CADET_KX:
965 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
966 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
967 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
968 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
971 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
972 case GNUNET_MESSAGE_TYPE_CADET_AX:
979 return GCC_is_sendable (q->c, q->fwd);
984 * Get first sendable message.
986 * @param peer The destination peer.
988 * @return First transmittable message, if any. Otherwise, NULL.
990 static struct CadetPeerQueue *
991 peer_get_first_message (const struct CadetPeer *peer)
993 struct CadetPeerQueue *q;
995 for (q = peer->queue_head; NULL != q; q = q->next)
997 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
998 if (queue_is_sendable (q))
1007 * Function to process paths received for a new peer addition. The recorded
1008 * paths form the initial tunnel, which can be optimized later.
1009 * Called on each result obtained for the DHT search.
1011 * @param cls closure
1015 search_handler (void *cls, const struct CadetPeerPath *path)
1017 struct CadetPeer *peer = cls;
1018 unsigned int connection_count;
1020 GCP_add_path_to_all (path, GNUNET_NO);
1022 /* Count connections */
1023 connection_count = GCT_count_connections (peer->tunnel);
1025 /* If we already have our minimum (or more) connections, it's enough */
1026 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1029 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1031 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1038 * Adjust core requested size to accomodate an ACK.
1040 * @param message_size Requested size.
1042 * @return Size enough to fit @c message_size and an ACK.
1045 get_core_size (size_t message_size)
1047 return message_size + sizeof (struct GNUNET_CADET_ACK);
1052 * Fill a core buffer with the appropriate data for the queued message.
1054 * @param queue Queue element for the message.
1055 * @param buf Core buffer to fill.
1056 * @param size Size remaining in @c buf.
1057 * @param[out] pid In case its an encrypted payload, set payload.
1059 * @return Bytes written to @c buf.
1062 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1064 struct CadetConnection *c = queue->c;
1067 switch (queue->type)
1069 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1070 *pid = GCC_get_pid (queue->c, queue->fwd);
1071 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1072 msg_size = send_core_data_raw (queue->cls, size, buf);
1073 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1075 case GNUNET_MESSAGE_TYPE_CADET_AX:
1076 *pid = GCC_get_pid (queue->c, queue->fwd);
1077 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1078 msg_size = send_core_data_raw (queue->cls, size, buf);
1079 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1081 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1082 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1083 case GNUNET_MESSAGE_TYPE_CADET_KX:
1084 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1085 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1086 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1087 msg_size = send_core_data_raw (queue->cls, size, buf);
1089 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1090 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1091 if (GCC_is_origin (c, GNUNET_YES))
1092 msg_size = send_core_connection_create (c, size, buf);
1094 msg_size = send_core_data_raw (queue->cls, size, buf);
1096 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1097 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1098 if (GCC_is_origin (c, GNUNET_NO) ||
1099 GCC_is_origin (c, GNUNET_YES))
1101 msg_size = send_core_connection_ack (c, size, buf);
1105 msg_size = send_core_data_raw (queue->cls, size, buf);
1108 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1109 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1110 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1111 /* This should be encapsulted */
1117 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1121 GNUNET_assert (size >= msg_size);
1128 * Core callback to write a queued packet to core buffer
1130 * @param cls Closure (peer info).
1131 * @param size Number of bytes available in buf.
1132 * @param buf Where the to write the message.
1134 * @return number of bytes written to buf
1137 queue_send (void *cls, size_t size, void *buf)
1139 struct CadetPeer *peer = cls;
1140 struct CadetConnection *c;
1141 struct CadetPeerQueue *queue;
1142 struct GNUNET_TIME_Relative core_wait_time;
1143 const struct GNUNET_PeerIdentity *dst_id;
1150 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1151 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1152 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1153 GCP_2s (peer), size);
1155 /* Sanity checking */
1156 if (NULL == buf || 0 == size)
1158 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1159 if (GNUNET_NO == in_shutdown)
1161 queue = peer_get_first_message (peer);
1162 dst_id = GNUNET_PEER_resolve2 (peer->id);
1163 peer->core_transmit =
1164 GNUNET_CORE_notify_transmit_ready (core_handle,
1165 GNUNET_NO, get_priority (queue),
1166 GNUNET_TIME_UNIT_FOREVER_REL,
1168 get_core_size (queue->size),
1171 peer->tmt_time = GNUNET_TIME_absolute_get ();
1175 peer->core_transmit = NULL;
1176 peer->tmt_time.abs_value_us = 0;
1186 peer->core_transmit = NULL;
1187 queue = peer_get_first_message (peer);
1190 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1191 peer->tmt_time.abs_value_us = 0;
1194 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1195 if (core_wait_time.rel_value_us >= 1000000)
1197 LOG (GNUNET_ERROR_TYPE_ERROR, " core wait time %s > 1 second\n",
1198 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1202 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1203 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1205 peer->tmt_time.abs_value_us = 0;
1207 /* Copy all possible messages to the core buffer */
1208 while (NULL != queue && rest >= queue->size)
1212 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1213 GCC_2s (c), GC_f2s(queue->fwd));
1214 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1215 queue->size, total_size, size);
1217 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1219 if (0 < drop_percent &&
1220 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1222 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1223 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1224 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1229 LOG (GNUNET_ERROR_TYPE_INFO,
1230 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1231 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1232 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1234 total_size += msg_size;
1236 dst = &dst[msg_size];
1239 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1240 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1243 queue = peer_get_first_message (peer);
1246 /* If more data in queue, send next */
1249 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1250 if (NULL == peer->core_transmit)
1252 dst_id = GNUNET_PEER_resolve2 (peer->id);
1253 peer->core_transmit =
1254 GNUNET_CORE_notify_transmit_ready (core_handle,
1255 GNUNET_NO, get_priority (queue),
1256 GNUNET_TIME_UNIT_FOREVER_REL,
1258 get_core_size (queue->size),
1261 peer->tmt_time = GNUNET_TIME_absolute_get ();
1262 queue->start_waiting = GNUNET_TIME_absolute_get ();
1266 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1268 // GCC_start_poll (); FIXME needed?
1272 // GCC_stop_poll(); FIXME needed?
1275 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1276 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1282 /******************************************************************************/
1283 /******************************** API ***********************************/
1284 /******************************************************************************/
1288 * Free a transmission that was already queued with all resources
1289 * associated to the request.
1291 * If connection was marked to be destroyed, and this was the last queued
1292 * message on it, the connection will be free'd as a result.
1294 * @param queue Queue handler to cancel.
1295 * @param clear_cls Is it necessary to free associated cls?
1296 * @param sent Was it really sent? (Could have been canceled)
1297 * @param pid PID, if relevant (was sent and was a payload message).
1299 * @return #GNUNET_YES if connection was destroyed as a result,
1300 * #GNUNET_NO otherwise.
1303 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1304 int sent, uint32_t pid)
1306 struct CadetPeer *peer;
1307 int connection_destroyed;
1310 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1311 if (GNUNET_YES == clear_cls)
1313 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1314 switch (queue->type)
1316 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1317 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1319 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1320 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1321 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1322 case GNUNET_MESSAGE_TYPE_CADET_KX:
1323 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1324 case GNUNET_MESSAGE_TYPE_CADET_AX:
1325 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1326 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1327 GNUNET_free_non_null (queue->cls);
1332 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1333 GC_m2s (queue->type));
1336 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1338 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1339 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1344 if (NULL != queue->cont)
1346 struct GNUNET_TIME_Relative wait_time;
1348 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1349 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1350 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1351 connection_destroyed = queue->cont (queue->cont_cls,
1352 queue->c, sent, queue->type, pid,
1353 queue->fwd, queue->size, wait_time);
1357 connection_destroyed = GNUNET_NO;
1360 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1362 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1363 peer->core_transmit = NULL;
1364 peer->tmt_time.abs_value_us = 0;
1367 GNUNET_free (queue);
1368 return connection_destroyed;
1373 * @brief Queue and pass message to core when possible.
1375 * @param peer Peer towards which to queue the message.
1376 * @param cls Closure (@c type dependant). It will be used by queue_send to
1377 * build the message to be sent if not already prebuilt.
1378 * @param type Type of the message, 0 for a raw message.
1379 * @param size Size of the message.
1380 * @param c Connection this message belongs to (can be NULL).
1381 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1382 * @param cont Continuation to be called once CORE has taken the message.
1383 * @param cont_cls Closure for @c cont.
1385 * @return Handle to cancel the message before it is sent. Once cont is called
1386 * message has been sent and therefore the handle is no longer valid.
1388 struct CadetPeerQueue *
1389 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1390 uint16_t payload_type, uint32_t payload_id, size_t size,
1391 struct CadetConnection *c, int fwd,
1392 GCP_sent cont, void *cont_cls)
1394 struct CadetPeerQueue *q;
1399 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1400 error_level = GNUNET_ERROR_TYPE_ERROR;
1402 error_level = GNUNET_ERROR_TYPE_INFO;
1404 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1405 GC_m2s (type), GC_m2s (payload_type), payload_id,
1406 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1408 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1410 if (NULL == peer->connections)
1412 /* We are not connected to this peer, ignore request. */
1413 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1414 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1421 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1422 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1427 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1429 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1430 GNUNET_YES : GCC_is_sendable (c, fwd);
1431 q = GNUNET_new (struct CadetPeerQueue);
1434 q->payload_type = payload_type;
1435 q->payload_id = payload_id;
1441 q->cont_cls = cont_cls;
1444 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1449 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1450 call_core = GNUNET_YES;
1453 q->start_waiting = GNUNET_TIME_absolute_get ();
1454 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1456 LOG (GNUNET_ERROR_TYPE_DEBUG,
1457 "calling core tmt rdy towards %s for %u bytes\n",
1458 GCP_2s (peer), size);
1459 peer->core_transmit =
1460 GNUNET_CORE_notify_transmit_ready (core_handle,
1461 GNUNET_NO, get_priority (q),
1462 GNUNET_TIME_UNIT_FOREVER_REL,
1463 GNUNET_PEER_resolve2 (peer->id),
1464 get_core_size (size),
1466 peer->tmt_time = GNUNET_TIME_absolute_get ();
1468 else if (GNUNET_NO == call_core)
1470 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1476 struct GNUNET_TIME_Relative elapsed;
1477 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1478 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1480 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1483 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1489 * Cancel all queued messages to a peer that belong to a certain connection.
1491 * @param peer Peer towards whom to cancel.
1492 * @param c Connection whose queued messages to cancel. Might be destroyed by
1493 * the sent continuation call.
1496 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1498 struct CadetPeerQueue *q;
1499 struct CadetPeerQueue *next;
1500 struct CadetPeerQueue *prev;
1501 int connection_destroyed;
1503 connection_destroyed = GNUNET_NO;
1504 for (q = peer->queue_head; NULL != q; q = next)
1509 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1510 GNUNET_break (GNUNET_NO == connection_destroyed);
1511 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1517 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1520 /* Get next from prev, q->next might be already freed:
1521 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1524 next = peer->queue_head;
1534 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1536 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1537 peer->core_transmit = NULL;
1538 peer->tmt_time.abs_value_us = 0;
1544 * Get the first transmittable message for a connection.
1546 * @param peer Neighboring peer.
1547 * @param c Connection.
1549 * @return First transmittable message.
1551 static struct CadetPeerQueue *
1552 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1554 struct CadetPeerQueue *q;
1556 for (q = peer->queue_head; NULL != q; q = q->next)
1560 if (queue_is_sendable (q))
1562 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1565 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1573 * Get the first message for a connection and unqueue it.
1575 * Only tunnel (or higher) level messages are unqueued. Connection specific
1576 * messages are silently destroyed upon encounter.
1578 * @param peer Neighboring peer.
1579 * @param c Connection.
1580 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1583 * @return First message for this connection.
1585 struct GNUNET_MessageHeader *
1586 GCP_connection_pop (struct CadetPeer *peer,
1587 struct CadetConnection *c,
1590 struct CadetPeerQueue *q;
1591 struct CadetPeerQueue *next;
1592 struct GNUNET_MessageHeader *msg;
1595 GNUNET_assert (NULL != destroyed);
1596 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1597 for (q = peer->queue_head; NULL != q; q = next)
1602 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1603 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1607 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1608 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1609 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1610 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1611 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1612 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1613 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1614 if (GNUNET_YES == dest)
1616 GNUNET_break (GNUNET_NO == *destroyed);
1617 *destroyed = GNUNET_YES;
1621 case GNUNET_MESSAGE_TYPE_CADET_KX:
1622 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1623 case GNUNET_MESSAGE_TYPE_CADET_AX:
1624 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1625 msg = (struct GNUNET_MessageHeader *) q->cls;
1626 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1627 if (GNUNET_YES == dest)
1629 GNUNET_break (GNUNET_NO == *destroyed);
1630 *destroyed = GNUNET_YES;
1636 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1644 * Unlock a possibly locked queue for a connection.
1646 * If there is a message that can be sent on this connection, call core for it.
1647 * Otherwise (if core transmit is already called or there is no sendable
1648 * message) do nothing.
1650 * @param peer Peer who keeps the queue.
1651 * @param c Connection whose messages to unlock.
1654 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1656 struct CadetPeerQueue *q;
1659 if (NULL != peer->core_transmit)
1661 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1662 return; /* Already unlocked */
1665 q = connection_get_first_message (peer, c);
1668 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1669 return; /* Nothing to transmit */
1673 peer->core_transmit =
1674 GNUNET_CORE_notify_transmit_ready (core_handle,
1675 GNUNET_NO, get_priority (q),
1676 GNUNET_TIME_UNIT_FOREVER_REL,
1677 GNUNET_PEER_resolve2 (peer->id),
1678 get_core_size (size),
1681 peer->tmt_time = GNUNET_TIME_absolute_get ();
1686 * Initialize the peer subsystem.
1688 * @param c Configuration.
1691 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1693 LOG (GNUNET_ERROR_TYPE_DEBUG,
1695 in_shutdown = GNUNET_NO;
1696 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1698 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1701 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1702 "CADET", "MAX_PEERS", "USING DEFAULT");
1707 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1714 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1715 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1716 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1717 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1718 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1721 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1722 NULL, /* Closure passed to CADET functions */
1723 &core_init, /* Call core_init once connected */
1724 &core_connect, /* Handle connects */
1725 &core_disconnect, /* remove peers on disconnects */
1726 NULL, /* Don't notify about all incoming messages */
1727 GNUNET_NO, /* For header only in notification */
1728 NULL, /* Don't notify about all outbound messages */
1729 GNUNET_NO, /* For header-only out notification */
1730 core_handlers); /* Register these handlers */
1732 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1734 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1735 /* Notify callbacks */
1740 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1741 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1742 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1743 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1744 transport_handle = NULL;
1749 if (NULL == core_handle)
1752 GNUNET_SCHEDULER_shutdown ();
1760 * Shut down the peer subsystem.
1765 in_shutdown = GNUNET_YES;
1766 GNUNET_CONTAINER_multipeermap_iterate (peers,
1769 if (NULL != core_handle)
1771 GNUNET_CORE_disconnect (core_handle);
1774 if (NULL != transport_handle)
1776 GNUNET_TRANSPORT_disconnect (transport_handle);
1777 transport_handle = NULL;
1779 GNUNET_PEER_change_rc (myid, -1);
1780 GNUNET_CONTAINER_multipeermap_destroy (peers);
1786 * Retrieve the CadetPeer stucture associated with the peer, create one
1787 * and insert it in the appropriate structures if the peer is not known yet.
1789 * @param peer_id Full identity of the peer.
1791 * @return Existing or newly created peer structure.
1794 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1796 struct CadetPeer *peer;
1798 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1801 peer = GNUNET_new (struct CadetPeer);
1802 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1804 peer_delete_oldest ();
1806 GNUNET_assert (GNUNET_OK ==
1807 GNUNET_CONTAINER_multipeermap_put (peers,
1810 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1811 peer->id = GNUNET_PEER_intern (peer_id);
1813 peer->last_contact = GNUNET_TIME_absolute_get ();
1820 * Retrieve the CadetPeer stucture associated with the peer, create one
1821 * and insert it in the appropriate structures if the peer is not known yet.
1823 * @param peer Short identity of the peer.
1825 * @return Existing or newly created peer structure.
1828 GCP_get_short (const GNUNET_PEER_Id peer)
1830 return GCP_get (GNUNET_PEER_resolve2 (peer));
1835 * Try to connect to a peer on transport level.
1837 * @param cls Closure (peer).
1838 * @param tc TaskContext.
1841 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1843 struct CadetPeer *peer = cls;
1845 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1848 GNUNET_TRANSPORT_try_connect (transport_handle,
1849 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1854 * Try to establish a new connection to this peer (in its tunnel).
1855 * If the peer doesn't have any path to it yet, try to get one.
1856 * If the peer already has some path, send a CREATE CONNECTION towards it.
1858 * @param peer Peer to connect to.
1861 GCP_connect (struct CadetPeer *peer)
1863 struct CadetTunnel *t;
1864 struct CadetPeerPath *p;
1865 struct CadetConnection *c;
1868 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1870 /* If we have a current hello, try to connect using it. */
1871 GCP_try_connect (peer);
1875 rerun_search = GNUNET_NO;
1877 if (NULL != peer->path_head)
1879 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1880 p = peer_get_best_path (peer);
1886 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1889 c = GCT_use_path (t, p);
1892 /* This case can happen when the path includes a first hop that is
1893 * not yet known to be connected.
1895 * This happens quite often during testing when running cadet
1896 * under valgrind: core connect notifications come very late
1897 * and the DHT result has already come and created a valid
1898 * path. In this case, the peer->connections_{pred,succ}
1899 * hashmaps will be NULL and tunnel_use_path will not be able
1900 * to create a connection from that path.
1902 * Re-running the DHT GET should give core time to callback.
1904 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1905 * updating statistics about this issue.
1907 rerun_search = GNUNET_YES;
1911 GCC_send_create (c);
1917 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1921 if (GNUNET_YES == rerun_search)
1923 struct GNUNET_TIME_Relative delay;
1925 GCP_stop_search (peer);
1926 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1927 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1932 if (GNUNET_NO == is_searching (peer))
1933 GCP_start_search (peer);
1938 * Chech whether there is a direct (core level) connection to peer.
1940 * @param peer Peer to check.
1942 * @return #GNUNET_YES if there is a direct connection.
1945 GCP_is_neighbor (const struct CadetPeer *peer)
1947 struct CadetPeerPath *path;
1949 if (NULL == peer->connections)
1952 for (path = peer->path_head; NULL != path; path = path->next)
1954 if (3 > path->length)
1958 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1964 * Create and initialize a new tunnel towards a peer, in case it has none.
1965 * In case the peer already has a tunnel, nothing is done.
1967 * Does not generate any traffic, just creates the local data structures.
1969 * @param peer Peer towards which to create the tunnel.
1972 GCP_add_tunnel (struct CadetPeer *peer)
1974 if (NULL != peer->tunnel)
1976 peer->tunnel = GCT_new (peer);
1981 * Add a connection to a neighboring peer.
1983 * Store that the peer is the first hop of the connection in one
1984 * direction and that on peer disconnect the connection must be
1985 * notified and destroyed, for it will no longer be valid.
1987 * @param peer Peer to add connection to.
1988 * @param c Connection to add.
1989 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1992 GCP_add_connection (struct CadetPeer *peer,
1993 struct CadetConnection *c,
1996 LOG (GNUNET_ERROR_TYPE_DEBUG,
1997 "adding connection %s\n",
1999 LOG (GNUNET_ERROR_TYPE_DEBUG,
2002 GNUNET_assert (NULL != peer->connections);
2003 GNUNET_assert (GNUNET_OK ==
2004 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2007 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2008 LOG (GNUNET_ERROR_TYPE_DEBUG,
2009 "Peer %s has now %u connections.\n",
2011 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2016 * Add the path to the peer and update the path used to reach it in case this
2019 * @param peer Destination peer to add the path to.
2020 * @param path New path to add. Last peer must be the peer in arg 1.
2021 * Path will be either used of freed if already known.
2022 * @param trusted Do we trust that this path is real?
2024 * @return path if path was taken, pointer to existing duplicate if exists
2027 struct CadetPeerPath *
2028 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
2031 struct CadetPeerPath *aux;
2035 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2036 path->length, GCP_2s (peer));
2038 if (NULL == peer || NULL == path
2039 || path->peers[path->length - 1] != peer->id)
2042 path_destroy (path);
2046 for (l = 1; l < path->length; l++)
2048 if (path->peers[l] == myid)
2050 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2051 for (l2 = 0; l2 < path->length - l; l2++)
2053 path->peers[l2] = path->peers[l + l2];
2057 path->peers = GNUNET_realloc (path->peers,
2058 path->length * sizeof (GNUNET_PEER_Id));
2062 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2064 if (2 >= path->length && GNUNET_NO == trusted)
2066 /* Only allow CORE to tell us about direct paths */
2067 path_destroy (path);
2071 l = path_get_length (path);
2074 path_destroy (path);
2078 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2079 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2081 l2 = path_get_length (aux);
2084 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2085 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2086 peer->path_tail, aux, path);
2091 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2093 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2094 path_destroy (path);
2099 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2101 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2104 if (NULL != peer->tunnel
2105 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2114 * Add the path to the origin peer and update the path used to reach it in case
2115 * this is the shortest.
2116 * The path is given in peer_info -> destination, therefore we turn the path
2117 * upside down first.
2119 * @param peer Peer to add the path to, being the origin of the path.
2120 * @param path New path to add after being inversed.
2121 * Path will be either used or freed.
2122 * @param trusted Do we trust that this path is real?
2124 * @return path if path was taken, pointer to existing duplicate if exists
2127 struct CadetPeerPath *
2128 GCP_add_path_to_origin (struct CadetPeer *peer,
2129 struct CadetPeerPath *path,
2135 return GCP_add_path (peer, path, trusted);
2140 * Adds a path to the info of all the peers in the path
2142 * @param p Path to process.
2143 * @param confirmed Whether we know if the path works or not.
2146 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2150 /* TODO: invert and add */
2151 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2152 for (i++; i < p->length; i++)
2154 struct CadetPeer *aux;
2155 struct CadetPeerPath *copy;
2157 aux = GCP_get_short (p->peers[i]);
2158 copy = path_duplicate (p);
2159 copy->length = i + 1;
2160 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2166 * Remove any path to the peer that has the extact same peers as the one given.
2168 * @param peer Peer to remove the path from.
2169 * @param path Path to remove. Is always destroyed .
2172 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2174 struct CadetPeerPath *iter;
2175 struct CadetPeerPath *next;
2177 GNUNET_assert (myid == path->peers[0]);
2178 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2180 LOG (GNUNET_ERROR_TYPE_INFO,
2181 "Removing path %p (%u) from %s\n",
2186 for (iter = peer->path_head; NULL != iter; iter = next)
2189 if (0 == path_cmp (path, iter))
2191 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2193 path_destroy (iter);
2196 path_destroy (path);
2201 * Remove a connection from a neighboring peer.
2203 * @param peer Peer to remove connection from.
2204 * @param c Connection to remove.
2207 GCP_remove_connection (struct CadetPeer *peer,
2208 const struct CadetConnection *c)
2210 LOG (GNUNET_ERROR_TYPE_DEBUG,
2211 "Removing connection %s\n",
2213 LOG (GNUNET_ERROR_TYPE_DEBUG,
2216 if ( (NULL == peer) ||
2217 (NULL == peer->connections) )
2219 GNUNET_assert (GNUNET_YES ==
2220 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2223 LOG (GNUNET_ERROR_TYPE_DEBUG,
2224 "Peer %s remains with %u connections.\n",
2226 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2231 * Start the DHT search for new paths towards the peer: we don't have
2232 * enough good connections.
2234 * @param peer Destination peer.
2237 GCP_start_search (struct CadetPeer *peer)
2239 const struct GNUNET_PeerIdentity *id;
2240 struct CadetTunnel *t = peer->tunnel;
2242 if (NULL != peer->search_h)
2248 if (NULL != peer->search_delayed)
2249 GCP_stop_search (peer);
2251 id = GNUNET_PEER_resolve2 (peer->id);
2252 peer->search_h = GCD_search (id, &search_handler, peer);
2256 /* Why would we search for a peer with no tunnel towards it? */
2261 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2262 || 0 == GCT_count_any_connections (t))
2264 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2270 * Stop the DHT search for new paths towards the peer: we already have
2271 * enough good connections.
2273 * @param peer Destination peer.
2276 GCP_stop_search (struct CadetPeer *peer)
2278 if (NULL != peer->search_h)
2280 GCD_search_stop (peer->search_h);
2281 peer->search_h = NULL;
2283 if (NULL != peer->search_delayed)
2285 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2286 peer->search_delayed = NULL;
2292 * Get the Full ID of a peer.
2294 * @param peer Peer to get from.
2296 * @return Full ID of peer.
2298 const struct GNUNET_PeerIdentity *
2299 GCP_get_id (const struct CadetPeer *peer)
2301 return GNUNET_PEER_resolve2 (peer->id);
2306 * Get the Short ID of a peer.
2308 * @param peer Peer to get from.
2310 * @return Short ID of peer.
2313 GCP_get_short_id (const struct CadetPeer *peer)
2322 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2328 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2331 if (NULL == t && GNUNET_YES == is_searching (peer))
2333 GCP_stop_search (peer);
2339 * Get the tunnel towards a peer.
2341 * @param peer Peer to get from.
2343 * @return Tunnel towards peer.
2345 struct CadetTunnel *
2346 GCP_get_tunnel (const struct CadetPeer *peer)
2348 return peer->tunnel;
2353 * Set the hello message.
2355 * @param peer Peer whose message to set.
2356 * @param hello Hello message.
2359 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2361 struct GNUNET_HELLO_Message *old;
2364 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2368 old = GCP_get_hello (peer);
2371 size = GNUNET_HELLO_size (hello);
2372 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2373 peer->hello = GNUNET_malloc (size);
2374 memcpy (peer->hello, hello, size);
2378 peer->hello = GNUNET_HELLO_merge (old, hello);
2379 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2380 peer->hello, GNUNET_HELLO_size (hello));
2387 * Get the hello message.
2389 * @param peer Peer whose message to get.
2391 * @return Hello message.
2393 struct GNUNET_HELLO_Message *
2394 GCP_get_hello (struct CadetPeer *peer)
2396 struct GNUNET_TIME_Absolute expiration;
2397 struct GNUNET_TIME_Relative remaining;
2399 if (NULL == peer->hello)
2402 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2403 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2404 if (0 == remaining.rel_value_us)
2406 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2407 GNUNET_STRINGS_absolute_time_to_string (expiration));
2408 GNUNET_free (peer->hello);
2416 * Try to connect to a peer on TRANSPORT level.
2418 * @param peer Peer to whom to connect.
2421 GCP_try_connect (struct CadetPeer *peer)
2423 struct GNUNET_HELLO_Message *hello;
2424 struct GNUNET_MessageHeader *mh;
2426 if (NULL == transport_handle)
2429 hello = GCP_get_hello (peer);
2433 mh = GNUNET_HELLO_get_header (hello);
2434 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2439 * Notify a peer that a link between two other peers is broken. If any path
2440 * used that link, eliminate it.
2442 * @param peer Peer affected by the change.
2443 * @param peer1 Peer whose link is broken.
2444 * @param peer2 Peer whose link is broken.
2447 GCP_notify_broken_link (struct CadetPeer *peer,
2448 struct GNUNET_PeerIdentity *peer1,
2449 struct GNUNET_PeerIdentity *peer2)
2451 struct CadetPeerPath *iter;
2452 struct CadetPeerPath *next;
2457 p1 = GNUNET_PEER_search (peer1);
2458 p2 = GNUNET_PEER_search (peer2);
2460 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2461 if (0 == p1 || 0 == p2)
2463 /* We don't even know them */
2467 for (iter = peer->path_head; NULL != iter; iter = next)
2470 for (i = 0; i < iter->length - 1; i++)
2472 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2473 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2478 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2481 path_invalidate (iter);
2489 * Count the number of known paths toward the peer.
2491 * @param peer Peer to get path info.
2493 * @return Number of known paths.
2496 GCP_count_paths (const struct CadetPeer *peer)
2498 struct CadetPeerPath *iter;
2501 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2509 * Iterate all known peers.
2511 * @param iter Iterator.
2512 * @param cls Closure for @c iter.
2515 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2518 GNUNET_CONTAINER_multipeermap_iterate (peers,
2525 * Get the static string for a peer ID.
2529 * @return Static string for it's ID.
2532 GCP_2s (const struct CadetPeer *peer)
2536 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));