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 (disconnected peer).
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_neighbor_disconnected (c, peer);
370 * Remove the direct path to the peer.
372 * @param peer Peer to remove the direct path from.
375 static struct CadetPeerPath *
376 pop_direct_path (struct CadetPeer *peer)
378 struct CadetPeerPath *iter;
380 for (iter = peer->path_head; NULL != iter; iter = iter->next)
382 if (2 >= iter->length)
384 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
392 /******************************************************************************/
393 /***************************** CORE CALLBACKS *********************************/
394 /******************************************************************************/
398 * Method called whenever a given peer connects.
401 * @param peer peer identity this notification is about
404 core_connect (void *cls,
405 const struct GNUNET_PeerIdentity *peer)
407 struct CadetPeer *neighbor;
408 struct CadetPeerPath *path;
411 GCC_check_connections ();
412 GNUNET_snprintf (own_id,
415 GNUNET_i2s (&my_full_id));
416 neighbor = GCP_get (peer, GNUNET_YES);
417 if (myid == neighbor->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] = neighbor->id;
432 GNUNET_PEER_change_rc (neighbor->id, 1);
434 path->peers[0] = myid;
435 GNUNET_PEER_change_rc (myid, 1);
436 GCP_add_path (neighbor, path, GNUNET_YES);
437 GNUNET_STATISTICS_update (stats,
441 GNUNET_assert (NULL == neighbor->connections);
442 neighbor->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
443 GNUNET_assert (NULL != neighbor->connections);
445 if ( (NULL != GCP_get_tunnel (neighbor)) &&
446 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
447 GCP_connect (neighbor);
448 GCC_check_connections ();
453 * Method called whenever a peer disconnects.
456 * @param peer peer identity this notification is about
459 core_disconnect (void *cls,
460 const struct GNUNET_PeerIdentity *peer)
463 struct CadetPeerPath *direct_path;
466 GCC_check_connections ();
467 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
469 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
472 GNUNET_break (GNUNET_YES == in_shutdown);
476 LOG (GNUNET_ERROR_TYPE_INFO,
477 "DISCONNECTED %s (self)\n",
480 LOG (GNUNET_ERROR_TYPE_INFO,
481 "DISCONNECTED %s <= %s\n",
482 own_id, GNUNET_i2s (peer));
483 direct_path = pop_direct_path (p);
484 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
487 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
488 p->connections = NULL;
489 if (NULL != p->core_transmit)
491 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
492 p->core_transmit = NULL;
493 p->tmt_time.abs_value_us = 0;
495 GNUNET_STATISTICS_update (stats,
499 path_destroy (direct_path);
500 GCC_check_connections ();
505 * Functions to handle messages from core
507 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
508 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
509 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
510 sizeof (struct GNUNET_CADET_ConnectionACK)},
511 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
512 sizeof (struct GNUNET_CADET_ConnectionBroken)},
513 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
514 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
515 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
516 sizeof (struct GNUNET_CADET_ACK)},
517 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
518 sizeof (struct GNUNET_CADET_Poll)},
519 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
520 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
521 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
527 * To be called on core init/fail.
529 * @param cls Closure (config)
530 * @param identity the public identity of this peer
533 core_init (void *cls,
534 const struct GNUNET_PeerIdentity *identity)
536 const struct GNUNET_CONFIGURATION_Handle *c = cls;
539 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
540 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
542 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
543 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
544 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
545 GNUNET_CORE_disconnect (core_handle);
546 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
547 NULL, /* Closure passed to CADET functions */
548 &core_init, /* Call core_init once connected */
549 &core_connect, /* Handle connects */
550 &core_disconnect, /* remove peers on disconnects */
551 NULL, /* Don't notify about all incoming messages */
552 GNUNET_NO, /* For header only in notification */
553 NULL, /* Don't notify about all outbound messages */
554 GNUNET_NO, /* For header-only out notification */
555 core_handlers); /* Register these handlers */
564 * Core callback to write a pre-constructed data packet to core buffer
566 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
567 * @param size Number of bytes available in buf.
568 * @param buf Where the to write the message.
570 * @return number of bytes written to buf
573 send_core_data_raw (void *cls, size_t size, void *buf)
575 struct GNUNET_MessageHeader *msg = cls;
578 GNUNET_assert (NULL != msg);
579 total_size = ntohs (msg->size);
581 if (total_size > size)
586 memcpy (buf, msg, total_size);
593 * Function to send a create connection message to a peer.
595 * @param c Connection to create.
596 * @param size number of bytes available in buf
597 * @param buf where the callee should write the message
598 * @return number of bytes written to buf
601 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
603 struct GNUNET_CADET_ConnectionCreate *msg;
604 struct GNUNET_PeerIdentity *peer_ptr;
605 const struct CadetPeerPath *p = GCC_get_path (c);
612 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
614 sizeof (struct GNUNET_CADET_ConnectionCreate) +
615 p->length * sizeof (struct GNUNET_PeerIdentity);
617 if (size < size_needed || NULL == buf)
622 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
623 msg->header.size = htons (size_needed);
624 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
625 msg->cid = *GCC_get_id (c);
627 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
628 for (i = 0; i < p->length; i++)
630 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
633 LOG (GNUNET_ERROR_TYPE_DEBUG,
634 "CONNECTION CREATE (%u bytes long) sent!\n",
641 * Creates a path ack message in buf and frees all unused resources.
643 * @param c Connection to send an ACK on.
644 * @param size number of bytes available in buf
645 * @param buf where the callee should write the message
647 * @return number of bytes written to buf
650 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
652 struct GNUNET_CADET_ConnectionACK *msg = buf;
654 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
655 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
660 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
661 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
662 msg->cid = *GCC_get_id (c);
664 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
665 return sizeof (struct GNUNET_CADET_ConnectionACK);
669 /******************************************************************************/
670 /******************************** STATIC ***********************************/
671 /******************************************************************************/
675 * Get priority for a queued message.
677 * @param q Queued message
679 * @return CORE priority to use.
681 static enum GNUNET_CORE_Priority
682 get_priority (struct CadetPeerQueue *q)
684 enum GNUNET_CORE_Priority low;
685 enum GNUNET_CORE_Priority high;
690 return GNUNET_CORE_PRIO_BACKGROUND;
693 /* Relayed traffic has lower priority, our own traffic has higher */
694 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
696 low = GNUNET_CORE_PRIO_BEST_EFFORT;
697 high = GNUNET_CORE_PRIO_URGENT;
701 low = GNUNET_CORE_PRIO_URGENT;
702 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
705 /* Bulky payload has lower priority, control traffic has higher. */
706 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
707 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
715 * Destroy the peer_info and free any allocated resources linked to it
717 * @param peer The peer_info to destroy.
718 * @return #GNUNET_OK on success
721 peer_destroy (struct CadetPeer *peer)
723 struct GNUNET_PeerIdentity id;
724 struct CadetPeerPath *p;
725 struct CadetPeerPath *nextp;
727 GNUNET_PEER_resolve (peer->id, &id);
728 GNUNET_PEER_change_rc (peer->id, -1);
730 LOG (GNUNET_ERROR_TYPE_INFO,
731 "destroying peer %s\n",
734 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
737 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
739 GCP_stop_search (peer);
744 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
748 if (NULL != peer->tunnel)
749 GCT_destroy_empty (peer->tunnel);
750 if (NULL != peer->connections)
752 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
753 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
755 GNUNET_free_non_null (peer->hello);
762 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
765 * @param key current key code
766 * @param value value in the hash map
767 * @return #GNUNET_YES if we should continue to iterate,
771 shutdown_peer (void *cls,
772 const struct GNUNET_PeerIdentity *key,
775 struct CadetPeer *p = value;
776 struct CadetTunnel *t = p->tunnel;
788 * Check if peer is searching for a path (either active or delayed search).
790 * @param peer Peer to check
791 * @return #GNUNET_YES if there is a search active.
792 * #GNUNET_NO otherwise.
795 is_searching (const struct CadetPeer *peer)
797 return ( (NULL == peer->search_h) &&
798 (NULL == peer->search_delayed) ) ?
799 GNUNET_NO : GNUNET_YES;
804 * @brief Start a search for a peer.
806 * @param cls Closure (Peer to search for).
807 * @param tc Task context.
810 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
812 struct CadetPeer *peer = cls;
814 peer->search_delayed = NULL;
815 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
817 GCC_check_connections ();
818 GCP_start_search (peer);
819 GCC_check_connections ();
824 * Returns if peer is used (has a tunnel or is neighbor).
826 * @param peer Peer to check.
827 * @return #GNUNET_YES if peer is in use.
830 peer_is_used (struct CadetPeer *peer)
832 struct CadetPeerPath *p;
834 if (NULL != peer->tunnel)
837 for (p = peer->path_head; NULL != p; p = p->next)
847 * Iterator over all the peers to get the oldest timestamp.
849 * @param cls Closure (unsued).
850 * @param key ID of the peer.
851 * @param value Peer_Info of the peer.
854 peer_get_oldest (void *cls,
855 const struct GNUNET_PeerIdentity *key,
858 struct CadetPeer *p = value;
859 struct GNUNET_TIME_Absolute *abs = cls;
861 /* Don't count active peers */
862 if (GNUNET_YES == peer_is_used (p))
865 if (abs->abs_value_us < p->last_contact.abs_value_us)
866 abs->abs_value_us = p->last_contact.abs_value_us;
873 * Iterator over all the peers to remove the oldest entry.
875 * @param cls Closure (unsued).
876 * @param key ID of the peer.
877 * @param value Peer_Info of the peer.
880 peer_timeout (void *cls,
881 const struct GNUNET_PeerIdentity *key,
884 struct CadetPeer *p = value;
885 struct GNUNET_TIME_Absolute *abs = cls;
887 LOG (GNUNET_ERROR_TYPE_WARNING,
888 "peer %s timeout\n", GNUNET_i2s (key));
890 if (p->last_contact.abs_value_us == abs->abs_value_us &&
891 GNUNET_NO == peer_is_used (p))
901 * Delete oldest unused peer.
904 peer_delete_oldest (void)
906 struct GNUNET_TIME_Absolute abs;
908 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
910 GNUNET_CONTAINER_multipeermap_iterate (peers,
913 GNUNET_CONTAINER_multipeermap_iterate (peers,
920 * Choose the best (yet unused) path towards a peer,
921 * considering the tunnel properties.
923 * @param peer The destination peer.
924 * @return Best current known path towards the peer, if any.
926 static struct CadetPeerPath *
927 peer_get_best_path (const struct CadetPeer *peer)
929 struct CadetPeerPath *best_p;
930 struct CadetPeerPath *p;
931 unsigned int best_cost;
934 best_cost = UINT_MAX;
936 for (p = peer->path_head; NULL != p; p = p->next)
938 if (GNUNET_NO == path_is_valid (p))
939 continue; /* Don't use invalid paths. */
940 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
941 continue; /* If path is already in use, skip it. */
943 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
954 * Is this queue element sendable?
956 * - All management traffic is always sendable.
957 * - For payload traffic, check the connection flow control.
959 * @param q Queue element to inspect.
960 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
963 queue_is_sendable (struct CadetPeerQueue *q)
965 /* Is PID-independent? */
968 case GNUNET_MESSAGE_TYPE_CADET_ACK:
969 case GNUNET_MESSAGE_TYPE_CADET_POLL:
970 case GNUNET_MESSAGE_TYPE_CADET_KX:
971 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
972 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
973 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
974 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
977 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
978 case GNUNET_MESSAGE_TYPE_CADET_AX:
985 return GCC_is_sendable (q->c, q->fwd);
990 * Get first sendable message.
992 * @param peer The destination peer.
994 * @return First transmittable message, if any. Otherwise, NULL.
996 static struct CadetPeerQueue *
997 peer_get_first_message (const struct CadetPeer *peer)
999 struct CadetPeerQueue *q;
1001 for (q = peer->queue_head; NULL != q; q = q->next)
1003 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
1004 if (queue_is_sendable (q))
1013 * Function to process paths received for a new peer addition. The recorded
1014 * paths form the initial tunnel, which can be optimized later.
1015 * Called on each result obtained for the DHT search.
1017 * @param cls closure
1021 search_handler (void *cls, const struct CadetPeerPath *path)
1023 struct CadetPeer *peer = cls;
1024 unsigned int connection_count;
1026 GCC_check_connections ();
1027 GCP_add_path_to_all (path, GNUNET_NO);
1029 /* Count connections */
1030 connection_count = GCT_count_connections (peer->tunnel);
1032 /* If we already have our minimum (or more) connections, it's enough */
1033 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1035 GCC_check_connections ();
1039 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1041 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1044 GCC_check_connections ();
1049 * Adjust core requested size to accomodate an ACK.
1051 * @param message_size Requested size.
1053 * @return Size enough to fit @c message_size and an ACK.
1056 get_core_size (size_t message_size)
1058 return message_size + sizeof (struct GNUNET_CADET_ACK);
1063 * Fill a core buffer with the appropriate data for the queued message.
1065 * @param queue Queue element for the message.
1066 * @param buf Core buffer to fill.
1067 * @param size Size remaining in @c buf.
1068 * @param[out] pid In case its an encrypted payload, set payload.
1070 * @return Bytes written to @c buf.
1073 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1075 struct CadetConnection *c = queue->c;
1078 switch (queue->type)
1080 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1081 *pid = GCC_get_pid (queue->c, queue->fwd);
1082 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1083 msg_size = send_core_data_raw (queue->cls, size, buf);
1084 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1086 case GNUNET_MESSAGE_TYPE_CADET_AX:
1087 *pid = GCC_get_pid (queue->c, queue->fwd);
1088 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1089 msg_size = send_core_data_raw (queue->cls, size, buf);
1090 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1092 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1093 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1094 case GNUNET_MESSAGE_TYPE_CADET_KX:
1095 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1096 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1097 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1098 msg_size = send_core_data_raw (queue->cls, size, buf);
1100 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1101 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1102 if (GCC_is_origin (c, GNUNET_YES))
1103 msg_size = send_core_connection_create (c, size, buf);
1105 msg_size = send_core_data_raw (queue->cls, size, buf);
1107 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1108 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1109 if (GCC_is_origin (c, GNUNET_NO) ||
1110 GCC_is_origin (c, GNUNET_YES))
1112 msg_size = send_core_connection_ack (c, size, buf);
1116 msg_size = send_core_data_raw (queue->cls, size, buf);
1119 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1120 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1121 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1122 /* This should be encapsulted */
1128 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1132 GNUNET_assert (size >= msg_size);
1139 * Core callback to write a queued packet to core buffer
1141 * @param cls Closure (peer info).
1142 * @param size Number of bytes available in buf.
1143 * @param buf Where the to write the message.
1145 * @return number of bytes written to buf
1148 queue_send (void *cls, size_t size, void *buf)
1150 struct CadetPeer *peer = cls;
1151 struct CadetConnection *c;
1152 struct CadetPeerQueue *queue;
1153 struct GNUNET_TIME_Relative core_wait_time;
1155 const struct GNUNET_PeerIdentity *dst_id;
1162 GCC_check_connections ();
1163 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1164 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1165 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1166 GCP_2s (peer), size);
1168 /* Sanity checking */
1169 if (NULL == buf || 0 == size)
1171 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1172 if (GNUNET_NO == in_shutdown)
1174 queue = peer_get_first_message (peer);
1177 peer->core_transmit = NULL;
1178 peer->tmt_time.abs_value_us = 0;
1179 GCC_check_connections ();
1182 dst_id = GNUNET_PEER_resolve2 (peer->id);
1183 peer->core_transmit =
1184 GNUNET_CORE_notify_transmit_ready (core_handle,
1185 GNUNET_NO, get_priority (queue),
1186 GNUNET_TIME_UNIT_FOREVER_REL,
1188 get_core_size (queue->size),
1191 peer->tmt_time = GNUNET_TIME_absolute_get ();
1195 peer->core_transmit = NULL;
1196 peer->tmt_time.abs_value_us = 0;
1198 GCC_check_connections ();
1207 peer->core_transmit = NULL;
1208 queue = peer_get_first_message (peer);
1211 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1212 peer->tmt_time.abs_value_us = 0;
1215 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1216 wait_s = GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_YES);
1217 if (core_wait_time.rel_value_us >= 1000000)
1219 LOG (GNUNET_ERROR_TYPE_ERROR,
1220 " %s: core wait time %s (> 1 second) for %u bytes\n",
1221 GCP_2s (peer), wait_s, queue->size);
1223 peer->tmt_time.abs_value_us = 0;
1225 /* Copy all possible messages to the core buffer */
1226 while (NULL != queue && rest >= queue->size)
1230 LOG (GNUNET_ERROR_TYPE_DEBUG, " on conn %s %s\n",
1231 GCC_2s (c), GC_f2s(queue->fwd));
1232 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1233 queue->size, total_size, size);
1235 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1237 if (0 < drop_percent &&
1238 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1240 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on conn %s %s\n",
1241 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1242 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1247 LOG (GNUNET_ERROR_TYPE_INFO,
1248 ">>> %s (%s %4u) on conn %s (%p) %s (%u bytes), after %s\n",
1249 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1250 queue->payload_id, GCC_2s (c), c,
1251 GC_f2s (queue->fwd), msg_size, wait_s);
1253 total_size += msg_size;
1255 dst = &dst[msg_size];
1258 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1259 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1262 queue = peer_get_first_message (peer);
1265 /* If more data in queue, send next */
1268 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1269 if (NULL == peer->core_transmit)
1271 dst_id = GNUNET_PEER_resolve2 (peer->id);
1272 peer->core_transmit =
1273 GNUNET_CORE_notify_transmit_ready (core_handle,
1274 GNUNET_NO, get_priority (queue),
1275 GNUNET_TIME_UNIT_FOREVER_REL,
1277 get_core_size (queue->size),
1280 peer->tmt_time = GNUNET_TIME_absolute_get ();
1281 queue->start_waiting = GNUNET_TIME_absolute_get ();
1285 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1287 // GCC_start_poll (); FIXME needed?
1291 // GCC_stop_poll(); FIXME needed?
1294 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1295 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1296 GCC_check_connections ();
1301 /******************************************************************************/
1302 /******************************** API ***********************************/
1303 /******************************************************************************/
1307 * Free a transmission that was already queued with all resources
1308 * associated to the request.
1310 * If connection was marked to be destroyed, and this was the last queued
1311 * message on it, the connection will be free'd as a result.
1313 * @param queue Queue handler to cancel.
1314 * @param clear_cls Is it necessary to free associated cls?
1315 * @param sent Was it really sent? (Could have been canceled)
1316 * @param pid PID, if relevant (was sent and was a payload message).
1318 * @return #GNUNET_YES if connection was destroyed as a result,
1319 * #GNUNET_NO otherwise.
1322 GCP_queue_destroy (struct CadetPeerQueue *queue,
1327 struct CadetPeer *peer;
1328 int connection_destroyed;
1330 GCC_check_connections ();
1332 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1333 if (GNUNET_YES == clear_cls)
1335 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1336 switch (queue->type)
1338 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1339 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1341 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1342 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1343 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1344 case GNUNET_MESSAGE_TYPE_CADET_KX:
1345 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1346 case GNUNET_MESSAGE_TYPE_CADET_AX:
1347 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1348 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1349 GNUNET_free_non_null (queue->cls);
1354 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1355 GC_m2s (queue->type));
1358 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1360 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1361 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1366 if (NULL != queue->cont)
1368 struct GNUNET_TIME_Relative wait_time;
1370 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1371 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1372 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1373 connection_destroyed = queue->cont (queue->cont_cls,
1374 queue->c, sent, queue->type, pid,
1375 queue->fwd, queue->size, wait_time);
1379 connection_destroyed = GNUNET_NO;
1382 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1384 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1385 peer->core_transmit = NULL;
1386 peer->tmt_time.abs_value_us = 0;
1389 GNUNET_free (queue);
1390 GCC_check_connections ();
1391 return connection_destroyed;
1396 * @brief Queue and pass message to core when possible.
1398 * @param peer Peer towards which to queue the message.
1399 * @param cls Closure (@c type dependant). It will be used by queue_send to
1400 * build the message to be sent if not already prebuilt.
1401 * @param type Type of the message, 0 for a raw message.
1402 * @param size Size of the message.
1403 * @param c Connection this message belongs to (can be NULL).
1404 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1405 * @param cont Continuation to be called once CORE has taken the message.
1406 * @param cont_cls Closure for @c cont.
1408 * @return Handle to cancel the message before it is sent. Once cont is called
1409 * message has been sent and therefore the handle is no longer valid.
1411 struct CadetPeerQueue *
1412 GCP_queue_add (struct CadetPeer *peer,
1415 uint16_t payload_type,
1416 uint32_t payload_id,
1418 struct CadetConnection *c,
1423 struct CadetPeerQueue *q;
1427 GCC_check_connections ();
1428 LOG (GNUNET_ERROR_TYPE_DEBUG,
1429 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1430 GC_m2s (type), GC_m2s (payload_type), payload_id,
1431 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1433 if (NULL == peer->connections)
1435 /* We are not connected to this peer, ignore request. */
1436 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1437 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1444 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1445 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1450 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1452 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1453 GNUNET_YES : GCC_is_sendable (c, fwd);
1454 q = GNUNET_new (struct CadetPeerQueue);
1457 q->payload_type = payload_type;
1458 q->payload_id = payload_id;
1464 q->cont_cls = cont_cls;
1467 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1472 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1473 call_core = GNUNET_YES;
1476 q->start_waiting = GNUNET_TIME_absolute_get ();
1477 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1479 LOG (GNUNET_ERROR_TYPE_DEBUG,
1480 "calling core tmt rdy towards %s for %u bytes\n",
1481 GCP_2s (peer), size);
1482 peer->core_transmit =
1483 GNUNET_CORE_notify_transmit_ready (core_handle,
1484 GNUNET_NO, get_priority (q),
1485 GNUNET_TIME_UNIT_FOREVER_REL,
1486 GNUNET_PEER_resolve2 (peer->id),
1487 get_core_size (size),
1489 peer->tmt_time = GNUNET_TIME_absolute_get ();
1491 else if (GNUNET_NO == call_core)
1493 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1499 struct GNUNET_TIME_Relative elapsed;
1500 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1501 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1503 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1506 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1507 GCC_check_connections ();
1513 * Cancel all queued messages to a peer that belong to a certain connection.
1515 * @param peer Peer towards whom to cancel.
1516 * @param c Connection whose queued messages to cancel. Might be destroyed by
1517 * the sent continuation call.
1520 GCP_queue_cancel (struct CadetPeer *peer,
1521 struct CadetConnection *c)
1523 struct CadetPeerQueue *q;
1524 struct CadetPeerQueue *next;
1525 struct CadetPeerQueue *prev;
1526 int connection_destroyed;
1528 GCC_check_connections ();
1529 connection_destroyed = GNUNET_NO;
1530 for (q = peer->queue_head; NULL != q; q = next)
1535 LOG (GNUNET_ERROR_TYPE_DEBUG,
1536 "GMP queue cancel %s\n",
1538 GNUNET_break (GNUNET_NO == connection_destroyed);
1539 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1545 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1548 /* Get next from prev, q->next might be already freed:
1549 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1552 next = peer->queue_head;
1562 if ( (NULL == peer->queue_head) &&
1563 (NULL != peer->core_transmit) )
1565 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1566 peer->core_transmit = NULL;
1567 peer->tmt_time.abs_value_us = 0;
1569 GCC_check_connections ();
1574 * Get the first transmittable message for a connection.
1576 * @param peer Neighboring peer.
1577 * @param c Connection.
1579 * @return First transmittable message.
1581 static struct CadetPeerQueue *
1582 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1584 struct CadetPeerQueue *q;
1586 for (q = peer->queue_head; NULL != q; q = q->next)
1590 if (queue_is_sendable (q))
1592 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1595 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1603 * Get the first message for a connection and unqueue it.
1605 * Only tunnel (or higher) level messages are unqueued. Connection specific
1606 * messages are silently destroyed upon encounter.
1608 * @param peer Neighboring peer.
1609 * @param c Connection.
1610 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1613 * @return First message for this connection.
1615 struct GNUNET_MessageHeader *
1616 GCP_connection_pop (struct CadetPeer *peer,
1617 struct CadetConnection *c,
1620 struct CadetPeerQueue *q;
1621 struct CadetPeerQueue *next;
1622 struct GNUNET_MessageHeader *msg;
1625 GCC_check_connections ();
1626 GNUNET_assert (NULL != destroyed);
1627 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on conn %p\n", c);
1628 for (q = peer->queue_head; NULL != q; q = next)
1633 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1634 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1638 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1639 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1640 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1641 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1642 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1643 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1644 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1645 if (GNUNET_YES == dest)
1647 GNUNET_break (GNUNET_NO == *destroyed);
1648 *destroyed = GNUNET_YES;
1652 case GNUNET_MESSAGE_TYPE_CADET_KX:
1653 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1654 case GNUNET_MESSAGE_TYPE_CADET_AX:
1655 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1656 msg = (struct GNUNET_MessageHeader *) q->cls;
1657 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1658 if (GNUNET_YES == dest)
1660 GNUNET_break (GNUNET_NO == *destroyed);
1661 *destroyed = GNUNET_YES;
1667 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1670 GCC_check_connections ();
1676 * Unlock a possibly locked queue for a connection.
1678 * If there is a message that can be sent on this connection, call core for it.
1679 * Otherwise (if core transmit is already called or there is no sendable
1680 * message) do nothing.
1682 * @param peer Peer who keeps the queue.
1683 * @param c Connection whose messages to unlock.
1686 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1688 struct CadetPeerQueue *q;
1691 GCC_check_connections ();
1692 if (NULL != peer->core_transmit)
1694 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1695 return; /* Already unlocked */
1698 q = connection_get_first_message (peer, c);
1701 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1702 return; /* Nothing to transmit */
1706 peer->core_transmit =
1707 GNUNET_CORE_notify_transmit_ready (core_handle,
1708 GNUNET_NO, get_priority (q),
1709 GNUNET_TIME_UNIT_FOREVER_REL,
1710 GNUNET_PEER_resolve2 (peer->id),
1711 get_core_size (size),
1714 peer->tmt_time = GNUNET_TIME_absolute_get ();
1715 GCC_check_connections ();
1720 * Initialize the peer subsystem.
1722 * @param c Configuration.
1725 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1727 LOG (GNUNET_ERROR_TYPE_DEBUG,
1729 in_shutdown = GNUNET_NO;
1730 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1732 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1735 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1736 "CADET", "MAX_PEERS", "USING DEFAULT");
1741 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1748 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1749 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1750 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1751 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1752 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1755 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1756 NULL, /* Closure passed to CADET functions */
1757 &core_init, /* Call core_init once connected */
1758 &core_connect, /* Handle connects */
1759 &core_disconnect, /* remove peers on disconnects */
1760 NULL, /* Don't notify about all incoming messages */
1761 GNUNET_NO, /* For header only in notification */
1762 NULL, /* Don't notify about all outbound messages */
1763 GNUNET_NO, /* For header-only out notification */
1764 core_handlers); /* Register these handlers */
1766 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1768 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1769 /* Notify callbacks */
1774 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1775 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1776 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1777 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1778 transport_handle = NULL;
1783 if (NULL == core_handle)
1786 GNUNET_SCHEDULER_shutdown ();
1794 * Shut down the peer subsystem.
1799 in_shutdown = GNUNET_YES;
1800 GNUNET_CONTAINER_multipeermap_iterate (peers,
1803 if (NULL != core_handle)
1805 GNUNET_CORE_disconnect (core_handle);
1808 if (NULL != transport_handle)
1810 GNUNET_TRANSPORT_disconnect (transport_handle);
1811 transport_handle = NULL;
1813 GNUNET_PEER_change_rc (myid, -1);
1814 GNUNET_CONTAINER_multipeermap_destroy (peers);
1820 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1821 * one and insert it in the appropriate structures if the peer is not known yet.
1823 * @param peer_id Full identity of the peer.
1824 * @param create #GNUNET_YES if a new peer should be created if unknown.
1825 * #GNUNET_NO otherwise.
1827 * @return Existing or newly created peer structure.
1828 * NULL if unknown and not requested @a create
1831 GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1833 struct CadetPeer *peer;
1835 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1838 peer = GNUNET_new (struct CadetPeer);
1839 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1841 peer_delete_oldest ();
1843 GNUNET_assert (GNUNET_OK ==
1844 GNUNET_CONTAINER_multipeermap_put (peers,
1847 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1848 peer->id = GNUNET_PEER_intern (peer_id);
1850 peer->last_contact = GNUNET_TIME_absolute_get ();
1857 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1858 * one and insert it in the appropriate structures if the peer is not known yet.
1860 * @param peer Short identity of the peer.
1861 * @param create #GNUNET_YES if a new peer should be created if unknown.
1862 * #GNUNET_NO otherwise.
1864 * @return Existing or newly created peer structure.
1865 * NULL if unknown and not requested @a create
1868 GCP_get_short (const GNUNET_PEER_Id peer, int create)
1870 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1875 * Try to connect to a peer on transport level.
1877 * @param cls Closure (peer).
1878 * @param tc TaskContext.
1881 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1883 struct CadetPeer *peer = cls;
1885 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1888 GNUNET_TRANSPORT_try_connect (transport_handle,
1889 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1894 * Try to establish a new connection to this peer (in its tunnel).
1895 * If the peer doesn't have any path to it yet, try to get one.
1896 * If the peer already has some path, send a CREATE CONNECTION towards it.
1898 * @param peer Peer to connect to.
1901 GCP_connect (struct CadetPeer *peer)
1903 struct CadetTunnel *t;
1904 struct CadetPeerPath *path;
1905 struct CadetConnection *c;
1908 GCC_check_connections ();
1909 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1911 /* If we have a current hello, try to connect using it. */
1912 GCP_try_connect (peer);
1916 rerun_search = GNUNET_NO;
1918 if (NULL != peer->path_head)
1920 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1921 path = peer_get_best_path (peer);
1927 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1930 c = GCT_use_path (t, path);
1933 /* This case can happen when the path includes a first hop that is
1934 * not yet known to be connected.
1936 * This happens quite often during testing when running cadet
1937 * under valgrind: core connect notifications come very late
1938 * and the DHT result has already come and created a valid
1939 * path. In this case, the peer->connections
1940 * hashmaps will be NULL and tunnel_use_path will not be able
1941 * to create a connection from that path.
1943 * Re-running the DHT GET should give core time to callback.
1945 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1946 * updating statistics about this issue.
1948 rerun_search = GNUNET_YES;
1952 GCC_send_create (c);
1958 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1962 if (GNUNET_YES == rerun_search)
1964 struct GNUNET_TIME_Relative delay;
1966 GCP_stop_search (peer);
1967 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1968 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
1971 GCC_check_connections ();
1975 if (GNUNET_NO == is_searching (peer))
1976 GCP_start_search (peer);
1977 GCC_check_connections ();
1982 * Chech whether there is a direct (core level) connection to peer.
1984 * @param peer Peer to check.
1986 * @return #GNUNET_YES if there is a direct connection.
1989 GCP_is_neighbor (const struct CadetPeer *peer)
1991 struct CadetPeerPath *path;
1993 if (NULL == peer->connections)
1996 for (path = peer->path_head; NULL != path; path = path->next)
1998 if (3 > path->length)
2002 /* Is not a neighbor but connections is not NULL, probably disconnecting */
2008 * Create and initialize a new tunnel towards a peer, in case it has none.
2009 * In case the peer already has a tunnel, nothing is done.
2011 * Does not generate any traffic, just creates the local data structures.
2013 * @param peer Peer towards which to create the tunnel.
2016 GCP_add_tunnel (struct CadetPeer *peer)
2018 GCC_check_connections ();
2019 if (NULL != peer->tunnel)
2021 peer->tunnel = GCT_new (peer);
2022 GCC_check_connections ();
2027 * Add a connection to a neighboring peer.
2029 * Store that the peer is the first hop of the connection in one
2030 * direction and that on peer disconnect the connection must be
2031 * notified and destroyed, for it will no longer be valid.
2033 * @param peer Peer to add connection to.
2034 * @param c Connection to add.
2035 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
2038 GCP_add_connection (struct CadetPeer *peer,
2039 struct CadetConnection *c,
2042 LOG (GNUNET_ERROR_TYPE_DEBUG,
2043 "adding connection %s\n",
2045 LOG (GNUNET_ERROR_TYPE_DEBUG,
2048 GNUNET_assert (NULL != peer->connections);
2049 GNUNET_assert (GNUNET_OK ==
2050 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2053 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2054 LOG (GNUNET_ERROR_TYPE_DEBUG,
2055 "Peer %s has now %u connections.\n",
2057 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2062 * Add the path to the peer and update the path used to reach it in case this
2065 * @param peer Destination peer to add the path to.
2066 * @param path New path to add. Last peer must be the peer in arg 1.
2067 * Path will be either used of freed if already known.
2068 * @param trusted Do we trust that this path is real?
2070 * @return path if path was taken, pointer to existing duplicate if exists
2073 struct CadetPeerPath *
2074 GCP_add_path (struct CadetPeer *peer,
2075 struct CadetPeerPath *path,
2078 struct CadetPeerPath *aux;
2082 GCC_check_connections ();
2083 LOG (GNUNET_ERROR_TYPE_DEBUG,
2084 "adding path [%u] to peer %s\n",
2085 path->length, GCP_2s (peer));
2087 if (NULL == peer || NULL == path
2088 || path->peers[path->length - 1] != peer->id)
2091 path_destroy (path);
2095 for (l = 1; l < path->length; l++)
2097 if (path->peers[l] == myid)
2099 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2100 for (l2 = 0; l2 < path->length - l; l2++)
2102 path->peers[l2] = path->peers[l + l2];
2106 path->peers = GNUNET_realloc (path->peers,
2107 path->length * sizeof (GNUNET_PEER_Id));
2111 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2113 if (2 >= path->length && GNUNET_NO == trusted)
2115 /* Only allow CORE to tell us about direct paths */
2116 path_destroy (path);
2120 l = path_get_length (path);
2123 path_destroy (path);
2127 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2128 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2130 l2 = path_get_length (aux);
2133 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2134 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2135 peer->path_tail, aux, path);
2140 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2142 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2143 path_destroy (path);
2148 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2150 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2153 if (NULL != peer->tunnel
2154 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel))
2158 GCC_check_connections ();
2164 * Add the path to the origin peer and update the path used to reach it in case
2165 * this is the shortest.
2166 * The path is given in peer_info -> destination, therefore we turn the path
2167 * upside down first.
2169 * @param peer Peer to add the path to, being the origin of the path.
2170 * @param path New path to add after being inversed.
2171 * Path will be either used or freed.
2172 * @param trusted Do we trust that this path is real?
2174 * @return path if path was taken, pointer to existing duplicate if exists
2177 struct CadetPeerPath *
2178 GCP_add_path_to_origin (struct CadetPeer *peer,
2179 struct CadetPeerPath *path,
2185 return GCP_add_path (peer, path, trusted);
2190 * Adds a path to the info of all the peers in the path
2192 * @param p Path to process.
2193 * @param confirmed Whether we know if the path works or not.
2196 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2200 /* TODO: invert and add */
2201 GCC_check_connections ();
2202 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2203 for (i++; i < p->length; i++)
2205 struct CadetPeer *aux;
2206 struct CadetPeerPath *copy;
2208 aux = GCP_get_short (p->peers[i], GNUNET_YES);
2209 copy = path_duplicate (p);
2210 copy->length = i + 1;
2211 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2213 GCC_check_connections ();
2218 * Remove any path to the peer that has the exact same peers as the one given.
2220 * @param peer Peer to remove the path from.
2221 * @param path Path to remove. Is always destroyed .
2224 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2226 struct CadetPeerPath *iter;
2227 struct CadetPeerPath *next;
2229 GCC_check_connections ();
2230 GNUNET_assert (myid == path->peers[0]);
2231 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2233 LOG (GNUNET_ERROR_TYPE_INFO, "Removing path %p (%u) from %s\n",
2234 path, path->length, GCP_2s (peer));
2236 for (iter = peer->path_head; NULL != iter; iter = next)
2239 if (0 == path_cmp (path, iter))
2241 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2243 path_destroy (iter);
2246 path_destroy (path);
2247 GCC_check_connections ();
2252 * Check that we are aware of a connection from a neighboring peer.
2254 * @param peer Peer to the connection is with
2255 * @param c Connection that should be in the map with this peer.
2258 GCP_check_connection (const struct CadetPeer *peer,
2259 const struct CadetConnection *c)
2261 GNUNET_assert (NULL != peer);
2262 GNUNET_assert (NULL != peer->connections);
2264 GNUNET_assert (GNUNET_YES ==
2265 GNUNET_CONTAINER_multihashmap_contains_value (peer->connections,
2272 * Remove a connection from a neighboring peer.
2274 * @param peer Peer to remove connection from.
2275 * @param c Connection to remove.
2278 GCP_remove_connection (struct CadetPeer *peer,
2279 const struct CadetConnection *c)
2281 LOG (GNUNET_ERROR_TYPE_DEBUG,
2282 "Removing connection %s\n",
2284 LOG (GNUNET_ERROR_TYPE_DEBUG,
2287 if ( (NULL == peer) ||
2288 (NULL == peer->connections) )
2290 GNUNET_assert (GNUNET_YES ==
2291 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2294 LOG (GNUNET_ERROR_TYPE_DEBUG,
2295 "Peer %s remains with %u connections.\n",
2297 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2302 * Start the DHT search for new paths towards the peer: we don't have
2303 * enough good connections.
2305 * @param peer Destination peer.
2308 GCP_start_search (struct CadetPeer *peer)
2310 const struct GNUNET_PeerIdentity *id;
2311 struct CadetTunnel *t = peer->tunnel;
2313 GCC_check_connections ();
2314 if (NULL != peer->search_h)
2320 if (NULL != peer->search_delayed)
2321 GCP_stop_search (peer);
2323 id = GNUNET_PEER_resolve2 (peer->id);
2324 peer->search_h = GCD_search (id, &search_handler, peer);
2328 /* Why would we search for a peer with no tunnel towards it? */
2333 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2334 || 0 == GCT_count_any_connections (t))
2336 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2338 GCC_check_connections ();
2343 * Stop the DHT search for new paths towards the peer: we already have
2344 * enough good connections.
2346 * @param peer Destination peer.
2349 GCP_stop_search (struct CadetPeer *peer)
2351 GCC_check_connections ();
2352 if (NULL != peer->search_h)
2354 GCD_search_stop (peer->search_h);
2355 peer->search_h = NULL;
2357 if (NULL != peer->search_delayed)
2359 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2360 peer->search_delayed = NULL;
2362 GCC_check_connections ();
2367 * Get the Full ID of a peer.
2369 * @param peer Peer to get from.
2371 * @return Full ID of peer.
2373 const struct GNUNET_PeerIdentity *
2374 GCP_get_id (const struct CadetPeer *peer)
2376 return GNUNET_PEER_resolve2 (peer->id);
2381 * Get the Short ID of a peer.
2383 * @param peer Peer to get from.
2385 * @return Short ID of peer.
2388 GCP_get_short_id (const struct CadetPeer *peer)
2397 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2403 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2406 if (NULL == t && GNUNET_YES == is_searching (peer))
2408 GCP_stop_search (peer);
2414 * Get the tunnel towards a peer.
2416 * @param peer Peer to get from.
2418 * @return Tunnel towards peer.
2420 struct CadetTunnel *
2421 GCP_get_tunnel (const struct CadetPeer *peer)
2425 return peer->tunnel;
2430 * Set the hello message.
2432 * @param peer Peer whose message to set.
2433 * @param hello Hello message.
2436 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2438 struct GNUNET_HELLO_Message *old;
2441 GCC_check_connections ();
2442 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2446 old = GCP_get_hello (peer);
2449 size = GNUNET_HELLO_size (hello);
2450 peer->hello = GNUNET_malloc (size);
2451 memcpy (peer->hello, hello, size);
2455 peer->hello = GNUNET_HELLO_merge (old, hello);
2458 GCC_check_connections ();
2463 * Get the hello message.
2465 * @param peer Peer whose message to get.
2467 * @return Hello message.
2469 struct GNUNET_HELLO_Message *
2470 GCP_get_hello (struct CadetPeer *peer)
2472 struct GNUNET_TIME_Absolute expiration;
2473 struct GNUNET_TIME_Relative remaining;
2475 if (NULL == peer->hello)
2478 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2479 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2480 if (0 == remaining.rel_value_us)
2482 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2483 GNUNET_STRINGS_absolute_time_to_string (expiration));
2484 GNUNET_free (peer->hello);
2492 * Try to connect to a peer on TRANSPORT level.
2494 * @param peer Peer to whom to connect.
2497 GCP_try_connect (struct CadetPeer *peer)
2499 struct GNUNET_HELLO_Message *hello;
2500 struct GNUNET_MessageHeader *mh;
2502 if (NULL == transport_handle)
2504 GCC_check_connections ();
2505 if (GNUNET_YES == GCP_is_neighbor (peer))
2507 hello = GCP_get_hello (peer);
2511 mh = GNUNET_HELLO_get_header (hello);
2512 GNUNET_TRANSPORT_offer_hello (transport_handle,
2516 GCC_check_connections ();
2521 * Notify a peer that a link between two other peers is broken. If any path
2522 * used that link, eliminate it.
2524 * @param peer Peer affected by the change.
2525 * @param peer1 Peer whose link is broken.
2526 * @param peer2 Peer whose link is broken.
2529 GCP_notify_broken_link (struct CadetPeer *peer,
2530 struct GNUNET_PeerIdentity *peer1,
2531 struct GNUNET_PeerIdentity *peer2)
2533 struct CadetPeerPath *iter;
2534 struct CadetPeerPath *next;
2539 GCC_check_connections ();
2540 p1 = GNUNET_PEER_search (peer1);
2541 p2 = GNUNET_PEER_search (peer2);
2543 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2544 if (0 == p1 || 0 == p2)
2546 /* We don't even know them */
2550 for (iter = peer->path_head; NULL != iter; iter = next)
2553 for (i = 0; i < iter->length - 1; i++)
2555 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2556 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2561 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2564 path_invalidate (iter);
2568 GCC_check_connections ();
2573 * Count the number of known paths toward the peer.
2575 * @param peer Peer to get path info.
2577 * @return Number of known paths.
2580 GCP_count_paths (const struct CadetPeer *peer)
2582 struct CadetPeerPath *iter;
2585 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2593 * Iterate over the paths to a peer.
2595 * @param peer Peer to get path info.
2596 * @param callback Function to call for every path.
2597 * @param cls Closure for @a callback.
2599 * @return Number of iterated paths.
2602 GCP_iterate_paths (struct CadetPeer *peer,
2603 GCP_path_iterator callback,
2606 struct CadetPeerPath *iter;
2609 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2612 if (GNUNET_YES != callback (cls, peer, iter))
2621 * Iterate all known peers.
2623 * @param iter Iterator.
2624 * @param cls Closure for @c iter.
2627 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2630 GCC_check_connections ();
2631 GNUNET_CONTAINER_multipeermap_iterate (peers,
2634 GCC_check_connections ();
2639 * Get the static string for a peer ID.
2643 * @return Static string for it's ID.
2646 GCP_2s (const struct CadetPeer *peer)
2650 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2654 /* end of gnunet-service-cadet_peer.c */