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 disconnect\n",
362 GCC_2s (c), GCP_2s (peer));
363 GCC_neighbor_disconnected (c, peer);
369 * Remove the direct path to the peer.
371 * @param peer Peer to remove the direct path from.
374 static struct CadetPeerPath *
375 pop_direct_path (struct CadetPeer *peer)
377 struct CadetPeerPath *iter;
379 for (iter = peer->path_head; NULL != iter; iter = iter->next)
381 if (2 >= iter->length)
383 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
391 /******************************************************************************/
392 /***************************** CORE CALLBACKS *********************************/
393 /******************************************************************************/
397 * Method called whenever a given peer connects.
400 * @param peer peer identity this notification is about
403 core_connect (void *cls,
404 const struct GNUNET_PeerIdentity *peer)
406 struct CadetPeer *neighbor;
407 struct CadetPeerPath *path;
410 GCC_check_connections ();
411 GNUNET_snprintf (own_id,
414 GNUNET_i2s (&my_full_id));
415 neighbor = GCP_get (peer, GNUNET_YES);
416 if (myid == neighbor->id)
418 LOG (GNUNET_ERROR_TYPE_INFO,
419 "CONNECTED %s (self)\n",
425 LOG (GNUNET_ERROR_TYPE_INFO,
426 "CONNECTED %s <= %s\n",
430 path->peers[1] = neighbor->id;
431 GNUNET_PEER_change_rc (neighbor->id, 1);
433 path->peers[0] = myid;
434 GNUNET_PEER_change_rc (myid, 1);
435 GCP_add_path (neighbor, path, GNUNET_YES);
437 GNUNET_assert (NULL == neighbor->connections);
438 neighbor->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
439 GNUNET_assert (NULL != neighbor->connections);
441 GNUNET_STATISTICS_update (stats,
446 if ( (NULL != GCP_get_tunnel (neighbor)) &&
447 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
448 GCP_connect (neighbor);
449 GCC_check_connections ();
454 * Method called whenever a peer disconnects.
457 * @param peer peer identity this notification is about
460 core_disconnect (void *cls,
461 const struct GNUNET_PeerIdentity *peer)
464 struct CadetPeerPath *direct_path;
467 GCC_check_connections ();
468 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
470 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
473 GNUNET_break (GNUNET_YES == in_shutdown);
477 LOG (GNUNET_ERROR_TYPE_INFO,
478 "DISCONNECTED %s (self)\n",
481 LOG (GNUNET_ERROR_TYPE_INFO,
482 "DISCONNECTED %s <= %s\n",
483 own_id, GNUNET_i2s (peer));
484 direct_path = pop_direct_path (p);
485 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
488 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
489 p->connections = NULL;
490 if (NULL != p->core_transmit)
492 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
493 p->core_transmit = NULL;
494 p->tmt_time.abs_value_us = 0;
496 GNUNET_STATISTICS_update (stats,
500 path_destroy (direct_path);
501 GCC_check_connections ();
506 * Functions to handle messages from core
508 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
509 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
510 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
511 sizeof (struct GNUNET_CADET_ConnectionACK)},
512 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
513 sizeof (struct GNUNET_CADET_ConnectionBroken)},
514 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
515 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
516 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
517 sizeof (struct GNUNET_CADET_ACK)},
518 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
519 sizeof (struct GNUNET_CADET_Poll)},
520 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
521 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
522 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
528 * To be called on core init/fail.
530 * @param cls Closure (config)
531 * @param identity the public identity of this peer
534 core_init (void *cls,
535 const struct GNUNET_PeerIdentity *identity)
537 const struct GNUNET_CONFIGURATION_Handle *c = cls;
540 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
541 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
543 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
544 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
545 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
546 GNUNET_CORE_disconnect (core_handle);
547 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
548 NULL, /* Closure passed to CADET functions */
549 &core_init, /* Call core_init once connected */
550 &core_connect, /* Handle connects */
551 &core_disconnect, /* remove peers on disconnects */
552 NULL, /* Don't notify about all incoming messages */
553 GNUNET_NO, /* For header only in notification */
554 NULL, /* Don't notify about all outbound messages */
555 GNUNET_NO, /* For header-only out notification */
556 core_handlers); /* Register these handlers */
565 * Core callback to write a pre-constructed data packet to core buffer
567 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
568 * @param size Number of bytes available in buf.
569 * @param buf Where the to write the message.
571 * @return number of bytes written to buf
574 send_core_data_raw (void *cls, size_t size, void *buf)
576 struct GNUNET_MessageHeader *msg = cls;
579 GNUNET_assert (NULL != msg);
580 total_size = ntohs (msg->size);
582 if (total_size > size)
587 memcpy (buf, msg, total_size);
594 * Function to send a create connection message to a peer.
596 * @param c Connection to create.
597 * @param size number of bytes available in buf
598 * @param buf where the callee should write the message
599 * @return number of bytes written to buf
602 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
604 struct GNUNET_CADET_ConnectionCreate *msg;
605 struct GNUNET_PeerIdentity *peer_ptr;
606 const struct CadetPeerPath *p = GCC_get_path (c);
613 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
615 sizeof (struct GNUNET_CADET_ConnectionCreate) +
616 p->length * sizeof (struct GNUNET_PeerIdentity);
618 if (size < size_needed || NULL == buf)
623 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
624 msg->header.size = htons (size_needed);
625 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
626 msg->cid = *GCC_get_id (c);
628 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
629 for (i = 0; i < p->length; i++)
631 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
634 LOG (GNUNET_ERROR_TYPE_DEBUG,
635 "CONNECTION CREATE (%u bytes long) sent!\n",
642 * Creates a path ack message in buf and frees all unused resources.
644 * @param c Connection to send an ACK on.
645 * @param size number of bytes available in buf
646 * @param buf where the callee should write the message
648 * @return number of bytes written to buf
651 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
653 struct GNUNET_CADET_ConnectionACK *msg = buf;
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
656 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
661 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
662 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
663 msg->cid = *GCC_get_id (c);
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
666 return sizeof (struct GNUNET_CADET_ConnectionACK);
670 /******************************************************************************/
671 /******************************** STATIC ***********************************/
672 /******************************************************************************/
676 * Get priority for a queued message.
678 * @param q Queued message
680 * @return CORE priority to use.
682 static enum GNUNET_CORE_Priority
683 get_priority (struct CadetPeerQueue *q)
685 enum GNUNET_CORE_Priority low;
686 enum GNUNET_CORE_Priority high;
691 return GNUNET_CORE_PRIO_BACKGROUND;
694 /* Relayed traffic has lower priority, our own traffic has higher */
695 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
697 low = GNUNET_CORE_PRIO_BEST_EFFORT;
698 high = GNUNET_CORE_PRIO_URGENT;
702 low = GNUNET_CORE_PRIO_URGENT;
703 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
706 /* Bulky payload has lower priority, control traffic has higher. */
707 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
708 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
716 * Destroy the peer_info and free any allocated resources linked to it
718 * @param peer The peer_info to destroy.
719 * @return #GNUNET_OK on success
722 peer_destroy (struct CadetPeer *peer)
724 struct GNUNET_PeerIdentity id;
725 struct CadetPeerPath *p;
726 struct CadetPeerPath *nextp;
728 GNUNET_PEER_resolve (peer->id, &id);
729 GNUNET_PEER_change_rc (peer->id, -1);
731 LOG (GNUNET_ERROR_TYPE_INFO,
732 "destroying peer %s\n",
735 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
738 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
740 GCP_stop_search (peer);
745 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
749 if (NULL != peer->tunnel)
750 GCT_destroy_empty (peer->tunnel);
751 if (NULL != peer->connections)
753 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
754 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
756 if (NULL != peer->core_transmit)
757 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
758 GNUNET_free_non_null (peer->hello);
765 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
768 * @param key current key code
769 * @param value value in the hash map
770 * @return #GNUNET_YES if we should continue to iterate,
774 shutdown_peer (void *cls,
775 const struct GNUNET_PeerIdentity *key,
778 struct CadetPeer *p = value;
779 struct CadetTunnel *t = p->tunnel;
780 LOG (GNUNET_ERROR_TYPE_DEBUG, " shutting down %s\n", GCP_2s (p));
791 * Check if peer is searching for a path (either active or delayed search).
793 * @param peer Peer to check
794 * @return #GNUNET_YES if there is a search active.
795 * #GNUNET_NO otherwise.
798 is_searching (const struct CadetPeer *peer)
800 return ( (NULL == peer->search_h) &&
801 (NULL == peer->search_delayed) ) ?
802 GNUNET_NO : GNUNET_YES;
807 * @brief Start a search for a peer.
809 * @param cls Closure (Peer to search for).
810 * @param tc Task context.
813 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
815 struct CadetPeer *peer = cls;
817 peer->search_delayed = NULL;
818 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
820 GCC_check_connections ();
821 GCP_start_search (peer);
822 GCC_check_connections ();
827 * Returns if peer is used (has a tunnel or is neighbor).
829 * @param peer Peer to check.
830 * @return #GNUNET_YES if peer is in use.
833 peer_is_used (struct CadetPeer *peer)
835 struct CadetPeerPath *p;
837 if (NULL != peer->tunnel)
840 for (p = peer->path_head; NULL != p; p = p->next)
850 * Iterator over all the peers to get the oldest timestamp.
852 * @param cls Closure (unsued).
853 * @param key ID of the peer.
854 * @param value Peer_Info of the peer.
857 peer_get_oldest (void *cls,
858 const struct GNUNET_PeerIdentity *key,
861 struct CadetPeer *p = value;
862 struct GNUNET_TIME_Absolute *abs = cls;
864 /* Don't count active peers */
865 if (GNUNET_YES == peer_is_used (p))
868 if (abs->abs_value_us < p->last_contact.abs_value_us)
869 abs->abs_value_us = p->last_contact.abs_value_us;
876 * Iterator over all the peers to remove the oldest entry.
878 * @param cls Closure (unsued).
879 * @param key ID of the peer.
880 * @param value Peer_Info of the peer.
883 peer_timeout (void *cls,
884 const struct GNUNET_PeerIdentity *key,
887 struct CadetPeer *p = value;
888 struct GNUNET_TIME_Absolute *abs = cls;
890 LOG (GNUNET_ERROR_TYPE_WARNING,
891 "peer %s timeout\n", GNUNET_i2s (key));
893 if (p->last_contact.abs_value_us == abs->abs_value_us &&
894 GNUNET_NO == peer_is_used (p))
904 * Delete oldest unused peer.
907 peer_delete_oldest (void)
909 struct GNUNET_TIME_Absolute abs;
911 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
913 GNUNET_CONTAINER_multipeermap_iterate (peers,
916 GNUNET_CONTAINER_multipeermap_iterate (peers,
923 * Choose the best (yet unused) path towards a peer,
924 * considering the tunnel properties.
926 * @param peer The destination peer.
927 * @return Best current known path towards the peer, if any.
929 static struct CadetPeerPath *
930 peer_get_best_path (const struct CadetPeer *peer)
932 struct CadetPeerPath *best_p;
933 struct CadetPeerPath *p;
934 unsigned int best_cost;
937 best_cost = UINT_MAX;
939 for (p = peer->path_head; NULL != p; p = p->next)
941 if (GNUNET_NO == path_is_valid (p))
942 continue; /* Don't use invalid paths. */
943 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
944 continue; /* If path is already in use, skip it. */
946 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
957 * Is this queue element sendable?
959 * - All management traffic is always sendable.
960 * - For payload traffic, check the connection flow control.
962 * @param q Queue element to inspect.
963 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
966 queue_is_sendable (struct CadetPeerQueue *q)
968 /* Is PID-independent? */
971 case GNUNET_MESSAGE_TYPE_CADET_ACK:
972 case GNUNET_MESSAGE_TYPE_CADET_POLL:
973 case GNUNET_MESSAGE_TYPE_CADET_KX:
974 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
975 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
976 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
977 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
980 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
981 case GNUNET_MESSAGE_TYPE_CADET_AX:
988 return GCC_is_sendable (q->c, q->fwd);
993 * Get first sendable message.
995 * @param peer The destination peer.
997 * @return First transmittable message, if any. Otherwise, NULL.
999 static struct CadetPeerQueue *
1000 peer_get_first_message (const struct CadetPeer *peer)
1002 struct CadetPeerQueue *q;
1004 for (q = peer->queue_head; NULL != q; q = q->next)
1006 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
1007 if (queue_is_sendable (q))
1016 * Function to process paths received for a new peer addition. The recorded
1017 * paths form the initial tunnel, which can be optimized later.
1018 * Called on each result obtained for the DHT search.
1020 * @param cls Closure (peer towards a path has been found).
1021 * @param path Path created from the DHT query. Will be freed afterwards.
1024 search_handler (void *cls, const struct CadetPeerPath *path)
1026 struct CadetPeer *peer = cls;
1027 unsigned int connection_count;
1029 GCC_check_connections ();
1030 GCP_add_path_to_all (path, GNUNET_NO);
1032 /* Count connections */
1033 connection_count = GCT_count_connections (peer->tunnel);
1035 /* If we already have our minimum (or more) connections, it's enough */
1036 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1038 GCC_check_connections ();
1042 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1044 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1047 GCC_check_connections ();
1052 * Adjust core requested size to accomodate an ACK.
1054 * @param message_size Requested size.
1056 * @return Size enough to fit @c message_size and an ACK.
1059 get_core_size (size_t message_size)
1061 return message_size + sizeof (struct GNUNET_CADET_ACK);
1066 * Fill a core buffer with the appropriate data for the queued message.
1068 * @param queue Queue element for the message.
1069 * @param buf Core buffer to fill.
1070 * @param size Size remaining in @c buf.
1071 * @param[out] pid In case its an encrypted payload, set payload.
1073 * @return Bytes written to @c buf.
1076 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1078 struct CadetConnection *c = queue->c;
1081 switch (queue->type)
1083 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1084 *pid = GCC_get_pid (queue->c, queue->fwd);
1085 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1086 msg_size = send_core_data_raw (queue->cls, size, buf);
1087 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1089 case GNUNET_MESSAGE_TYPE_CADET_AX:
1090 *pid = GCC_get_pid (queue->c, queue->fwd);
1091 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1092 msg_size = send_core_data_raw (queue->cls, size, buf);
1093 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1095 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1096 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1097 case GNUNET_MESSAGE_TYPE_CADET_KX:
1098 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1099 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1100 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1101 msg_size = send_core_data_raw (queue->cls, size, buf);
1103 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1104 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1105 if (GCC_is_origin (c, GNUNET_YES))
1106 msg_size = send_core_connection_create (c, size, buf);
1108 msg_size = send_core_data_raw (queue->cls, size, buf);
1110 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1111 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1112 if (GCC_is_origin (c, GNUNET_NO) ||
1113 GCC_is_origin (c, GNUNET_YES))
1115 msg_size = send_core_connection_ack (c, size, buf);
1119 msg_size = send_core_data_raw (queue->cls, size, buf);
1122 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1123 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1124 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1125 /* This should be encapsulted */
1131 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1135 GNUNET_assert (size >= msg_size);
1142 * Debug function should NEVER return true in production code, useful to
1143 * simulate losses for testcases.
1145 * @param q Queue handle with info about the message.
1147 * @return #GNUNET_YES or #GNUNET_NO with the decision to drop.
1150 should_I_drop (struct CadetPeerQueue *q)
1152 if (0 == drop_percent)
1155 if (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1163 * Core callback to write a queued packet to core buffer
1165 * @param cls Closure (peer info).
1166 * @param size Number of bytes available in buf.
1167 * @param buf Where the to write the message.
1169 * @return number of bytes written to buf
1172 queue_send (void *cls, size_t size, void *buf)
1174 struct CadetPeer *peer = cls;
1175 struct CadetConnection *c;
1176 struct CadetPeerQueue *queue;
1177 struct GNUNET_TIME_Relative core_wait_time;
1179 const struct GNUNET_PeerIdentity *dst_id;
1186 GCC_check_connections ();
1187 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1188 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1189 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1190 GCP_2s (peer), size);
1192 /* Sanity checking */
1193 if (NULL == buf || 0 == size)
1195 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1196 if (GNUNET_NO == in_shutdown)
1198 queue = peer_get_first_message (peer);
1201 peer->core_transmit = NULL;
1202 peer->tmt_time.abs_value_us = 0;
1203 GCC_check_connections ();
1206 dst_id = GNUNET_PEER_resolve2 (peer->id);
1207 peer->core_transmit =
1208 GNUNET_CORE_notify_transmit_ready (core_handle,
1209 GNUNET_NO, get_priority (queue),
1210 GNUNET_TIME_UNIT_FOREVER_REL,
1212 get_core_size (queue->size),
1215 peer->tmt_time = GNUNET_TIME_absolute_get ();
1219 peer->core_transmit = NULL;
1220 peer->tmt_time.abs_value_us = 0;
1222 GCC_check_connections ();
1231 peer->core_transmit = NULL;
1232 queue = peer_get_first_message (peer);
1235 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1236 peer->tmt_time.abs_value_us = 0;
1239 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1240 wait_s = GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_YES);
1241 if (core_wait_time.rel_value_us >= 1000000)
1243 LOG (GNUNET_ERROR_TYPE_WARNING,
1244 " %s: core wait time %s (> 1 second) for %u bytes\n",
1245 GCP_2s (peer), wait_s, queue->size);
1247 peer->tmt_time.abs_value_us = 0;
1249 /* Copy all possible messages to the core buffer */
1250 while (NULL != queue && rest >= queue->size)
1254 LOG (GNUNET_ERROR_TYPE_DEBUG, " on conn %s %s\n",
1255 GCC_2s (c), GC_f2s(queue->fwd));
1256 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1257 queue->size, total_size, size);
1259 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1261 if (should_I_drop (queue))
1263 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on conn %s %s\n",
1264 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1265 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1270 LOG (GNUNET_ERROR_TYPE_INFO,
1271 ">>> %s (%s %4u) on conn %s (%p) %s [%5u], after %s\n",
1272 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1273 queue->payload_id, GCC_2s (c), c,
1274 GC_f2s (queue->fwd), msg_size, wait_s);
1276 total_size += msg_size;
1278 dst = &dst[msg_size];
1281 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1282 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1285 queue = peer_get_first_message (peer);
1288 /* If more data in queue, send next */
1291 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1292 if (NULL == peer->core_transmit)
1294 dst_id = GNUNET_PEER_resolve2 (peer->id);
1295 peer->core_transmit =
1296 GNUNET_CORE_notify_transmit_ready (core_handle,
1297 GNUNET_NO, get_priority (queue),
1298 GNUNET_TIME_UNIT_FOREVER_REL,
1300 get_core_size (queue->size),
1303 peer->tmt_time = GNUNET_TIME_absolute_get ();
1304 queue->start_waiting = GNUNET_TIME_absolute_get ();
1308 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1310 // GCC_start_poll (); FIXME needed?
1314 // GCC_stop_poll(); FIXME needed?
1317 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1318 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1319 GCC_check_connections ();
1324 /******************************************************************************/
1325 /******************************** API ***********************************/
1326 /******************************************************************************/
1330 * Free a transmission that was already queued with all resources
1331 * associated to the request.
1333 * If connection was marked to be destroyed, and this was the last queued
1334 * message on it, the connection will be free'd as a result.
1336 * @param queue Queue handler to cancel.
1337 * @param clear_cls Is it necessary to free associated cls?
1338 * @param sent Was it really sent? (Could have been canceled)
1339 * @param pid PID, if relevant (was sent and was a payload message).
1341 * @return #GNUNET_YES if connection was destroyed as a result,
1342 * #GNUNET_NO otherwise.
1345 GCP_queue_destroy (struct CadetPeerQueue *queue,
1350 struct CadetPeer *peer;
1351 int connection_destroyed;
1353 GCC_check_connections ();
1355 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1356 if (GNUNET_YES == clear_cls)
1358 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1359 switch (queue->type)
1361 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1362 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1364 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1365 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1366 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1367 case GNUNET_MESSAGE_TYPE_CADET_KX:
1368 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1369 case GNUNET_MESSAGE_TYPE_CADET_AX:
1370 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1371 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1372 GNUNET_free_non_null (queue->cls);
1377 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1378 GC_m2s (queue->type));
1381 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1383 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1384 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1389 if (NULL != queue->cont)
1391 struct GNUNET_TIME_Relative wait_time;
1393 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1394 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1395 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1396 connection_destroyed = queue->cont (queue->cont_cls,
1397 queue->c, sent, queue->type, pid,
1398 queue->fwd, queue->size, wait_time);
1402 connection_destroyed = GNUNET_NO;
1405 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1407 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1408 peer->core_transmit = NULL;
1409 peer->tmt_time.abs_value_us = 0;
1412 GNUNET_free (queue);
1413 GCC_check_connections ();
1414 return connection_destroyed;
1419 * @brief Queue and pass message to core when possible.
1421 * @param peer Peer towards which to queue the message.
1422 * @param cls Closure (@c type dependant). It will be used by queue_send to
1423 * build the message to be sent if not already prebuilt.
1424 * @param type Type of the message.
1425 * @param payload_type Type of the message's payload
1426 * 0 if the message is a retransmission (unknown payload).
1427 * UINT16_MAX if the message does not have payload.
1428 * @param payload_id ID of the payload (MID, ACK #, etc)
1429 * @param size Size of the message.
1430 * @param c Connection this message belongs to (can be NULL).
1431 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1432 * @param cont Continuation to be called once CORE has taken the message.
1433 * @param cont_cls Closure for @c cont.
1435 * @return Handle to cancel the message before it is sent. Once cont is called
1436 * message has been sent and therefore the handle is no longer valid.
1438 struct CadetPeerQueue *
1439 GCP_queue_add (struct CadetPeer *peer,
1442 uint16_t payload_type,
1443 uint32_t payload_id,
1445 struct CadetConnection *c,
1450 struct CadetPeerQueue *q;
1454 GCC_check_connections ();
1455 LOG (GNUNET_ERROR_TYPE_DEBUG,
1456 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1457 GC_m2s (type), GC_m2s (payload_type), payload_id,
1458 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1460 if (NULL == peer->connections)
1462 /* We are not connected to this peer, ignore request. */
1463 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1464 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1471 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1472 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1477 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1479 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1480 GNUNET_YES : GCC_is_sendable (c, fwd);
1481 q = GNUNET_new (struct CadetPeerQueue);
1484 q->payload_type = payload_type;
1485 q->payload_id = payload_id;
1491 q->cont_cls = cont_cls;
1494 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1499 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1500 call_core = GNUNET_YES;
1503 q->start_waiting = GNUNET_TIME_absolute_get ();
1504 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1506 LOG (GNUNET_ERROR_TYPE_DEBUG,
1507 "calling core tmt rdy towards %s for %u bytes\n",
1508 GCP_2s (peer), size);
1509 peer->core_transmit =
1510 GNUNET_CORE_notify_transmit_ready (core_handle,
1511 GNUNET_NO, get_priority (q),
1512 GNUNET_TIME_UNIT_FOREVER_REL,
1513 GNUNET_PEER_resolve2 (peer->id),
1514 get_core_size (size),
1516 peer->tmt_time = GNUNET_TIME_absolute_get ();
1518 else if (GNUNET_NO == call_core)
1520 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1526 struct GNUNET_TIME_Relative elapsed;
1527 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1528 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1530 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1533 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1534 GCC_check_connections ();
1540 * Cancel all queued messages to a peer that belong to a certain connection.
1542 * @param peer Peer towards whom to cancel.
1543 * @param c Connection whose queued messages to cancel. Might be destroyed by
1544 * the sent continuation call.
1547 GCP_queue_cancel (struct CadetPeer *peer,
1548 struct CadetConnection *c)
1550 struct CadetPeerQueue *q;
1551 struct CadetPeerQueue *next;
1552 struct CadetPeerQueue *prev;
1553 int connection_destroyed;
1555 GCC_check_connections ();
1556 connection_destroyed = GNUNET_NO;
1557 for (q = peer->queue_head; NULL != q; q = next)
1562 LOG (GNUNET_ERROR_TYPE_DEBUG,
1563 "GMP queue cancel %s\n",
1565 GNUNET_assert (GNUNET_NO == connection_destroyed);
1566 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1572 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1575 /* Get next from prev, q->next might be already freed:
1576 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1579 next = peer->queue_head;
1589 if ( (NULL == peer->queue_head) &&
1590 (NULL != peer->core_transmit) )
1592 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1593 peer->core_transmit = NULL;
1594 peer->tmt_time.abs_value_us = 0;
1596 GCC_check_connections ();
1601 * Get the first transmittable message for a connection.
1603 * @param peer Neighboring peer.
1604 * @param c Connection.
1606 * @return First transmittable message.
1608 static struct CadetPeerQueue *
1609 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1611 struct CadetPeerQueue *q;
1613 for (q = peer->queue_head; NULL != q; q = q->next)
1617 if (queue_is_sendable (q))
1619 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1622 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1630 * Get the first message for a connection and unqueue it.
1632 * Only tunnel (or higher) level messages are unqueued. Connection specific
1633 * messages are silently destroyed upon encounter.
1635 * @param peer Neighboring peer.
1636 * @param c Connection.
1637 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1640 * @return First message for this connection.
1642 struct GNUNET_MessageHeader *
1643 GCP_connection_pop (struct CadetPeer *peer,
1644 struct CadetConnection *c,
1647 struct CadetPeerQueue *q;
1648 struct CadetPeerQueue *next;
1649 struct GNUNET_MessageHeader *msg;
1652 GCC_check_connections ();
1653 GNUNET_assert (NULL != destroyed);
1654 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on conn %p\n", c);
1655 for (q = peer->queue_head; NULL != q; q = next)
1660 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1661 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1665 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1666 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1667 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1668 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1669 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1670 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1671 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1672 if (GNUNET_YES == dest)
1674 GNUNET_break (GNUNET_NO == *destroyed);
1675 *destroyed = GNUNET_YES;
1679 case GNUNET_MESSAGE_TYPE_CADET_KX:
1680 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1681 case GNUNET_MESSAGE_TYPE_CADET_AX:
1682 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1683 msg = (struct GNUNET_MessageHeader *) q->cls;
1684 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1685 if (GNUNET_YES == dest)
1687 GNUNET_break (GNUNET_NO == *destroyed);
1688 *destroyed = GNUNET_YES;
1694 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1697 GCC_check_connections ();
1703 * Unlock a possibly locked queue for a connection.
1705 * If there is a message that can be sent on this connection, call core for it.
1706 * Otherwise (if core transmit is already called or there is no sendable
1707 * message) do nothing.
1709 * @param peer Peer who keeps the queue.
1710 * @param c Connection whose messages to unlock.
1713 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1715 struct CadetPeerQueue *q;
1718 GCC_check_connections ();
1719 if (NULL != peer->core_transmit)
1721 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1722 return; /* Already unlocked */
1725 q = connection_get_first_message (peer, c);
1728 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1729 return; /* Nothing to transmit */
1733 peer->core_transmit =
1734 GNUNET_CORE_notify_transmit_ready (core_handle,
1735 GNUNET_NO, get_priority (q),
1736 GNUNET_TIME_UNIT_FOREVER_REL,
1737 GNUNET_PEER_resolve2 (peer->id),
1738 get_core_size (size),
1741 peer->tmt_time = GNUNET_TIME_absolute_get ();
1742 GCC_check_connections ();
1747 * Initialize the peer subsystem.
1749 * @param c Configuration.
1752 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1754 LOG (GNUNET_ERROR_TYPE_DEBUG,
1756 in_shutdown = GNUNET_NO;
1757 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1759 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1762 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1763 "CADET", "MAX_PEERS", "USING DEFAULT");
1768 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1775 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1776 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1777 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1778 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1779 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1782 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1783 NULL, /* Closure passed to CADET functions */
1784 &core_init, /* Call core_init once connected */
1785 &core_connect, /* Handle connects */
1786 &core_disconnect, /* remove peers on disconnects */
1787 NULL, /* Don't notify about all incoming messages */
1788 GNUNET_NO, /* For header only in notification */
1789 NULL, /* Don't notify about all outbound messages */
1790 GNUNET_NO, /* For header-only out notification */
1791 core_handlers); /* Register these handlers */
1793 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1795 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1796 /* Notify callbacks */
1801 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1802 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1803 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1804 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1805 transport_handle = NULL;
1810 if (NULL == core_handle)
1813 GNUNET_SCHEDULER_shutdown ();
1821 * Shut down the peer subsystem.
1826 LOG (GNUNET_ERROR_TYPE_DEBUG, "Shutting down peers\n");
1827 in_shutdown = GNUNET_YES;
1828 GNUNET_CONTAINER_multipeermap_iterate (peers,
1831 if (NULL != core_handle)
1833 GNUNET_CORE_disconnect (core_handle);
1836 if (NULL != transport_handle)
1838 GNUNET_TRANSPORT_disconnect (transport_handle);
1839 transport_handle = NULL;
1841 GNUNET_PEER_change_rc (myid, -1);
1842 GNUNET_CONTAINER_multipeermap_destroy (peers);
1848 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1849 * one and insert it in the appropriate structures if the peer is not known yet.
1851 * @param peer_id Full identity of the peer.
1852 * @param create #GNUNET_YES if a new peer should be created if unknown.
1853 * #GNUNET_NO otherwise.
1855 * @return Existing or newly created peer structure.
1856 * NULL if unknown and not requested @a create
1859 GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1861 struct CadetPeer *peer;
1863 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1866 peer = GNUNET_new (struct CadetPeer);
1867 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1869 peer_delete_oldest ();
1871 GNUNET_assert (GNUNET_OK ==
1872 GNUNET_CONTAINER_multipeermap_put (peers,
1875 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1876 peer->id = GNUNET_PEER_intern (peer_id);
1878 peer->last_contact = GNUNET_TIME_absolute_get ();
1885 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1886 * one and insert it in the appropriate structures if the peer is not known yet.
1888 * @param peer Short identity of the peer.
1889 * @param create #GNUNET_YES if a new peer should be created if unknown.
1890 * #GNUNET_NO otherwise.
1892 * @return Existing or newly created peer structure.
1893 * NULL if unknown and not requested @a create
1896 GCP_get_short (const GNUNET_PEER_Id peer, int create)
1898 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1903 * Try to connect to a peer on transport level.
1905 * @param cls Closure (peer).
1906 * @param tc TaskContext.
1909 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1911 struct CadetPeer *peer = cls;
1913 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1916 GNUNET_TRANSPORT_try_connect (transport_handle,
1917 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1922 * Try to establish a new connection to this peer (in its tunnel).
1923 * If the peer doesn't have any path to it yet, try to get one.
1924 * If the peer already has some path, send a CREATE CONNECTION towards it.
1926 * @param peer Peer to connect to.
1929 GCP_connect (struct CadetPeer *peer)
1931 struct CadetTunnel *t;
1932 struct CadetPeerPath *path;
1933 struct CadetConnection *c;
1936 GCC_check_connections ();
1937 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1939 /* If we have a current hello, try to connect using it. */
1940 GCP_try_connect (peer);
1944 rerun_search = GNUNET_NO;
1946 if (NULL != peer->path_head)
1948 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1949 path = peer_get_best_path (peer);
1955 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1958 c = GCT_use_path (t, path);
1961 /* This case can happen when the path includes a first hop that is
1962 * not yet known to be connected.
1964 * This happens quite often during testing when running cadet
1965 * under valgrind: core connect notifications come very late
1966 * and the DHT result has already come and created a valid
1967 * path. In this case, the peer->connections
1968 * hashmaps will be NULL and tunnel_use_path will not be able
1969 * to create a connection from that path.
1971 * Re-running the DHT GET should give core time to callback.
1973 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1974 * updating statistics about this issue.
1976 rerun_search = GNUNET_YES;
1980 GCC_send_create (c);
1986 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1990 if (GNUNET_YES == rerun_search)
1992 struct GNUNET_TIME_Relative delay;
1994 GCP_stop_search (peer);
1995 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1996 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
1999 GCC_check_connections ();
2003 if (GNUNET_NO == is_searching (peer))
2004 GCP_start_search (peer);
2005 GCC_check_connections ();
2010 * Chech whether there is a direct (core level) connection to peer.
2012 * @param peer Peer to check.
2014 * @return #GNUNET_YES if there is a direct connection.
2017 GCP_is_neighbor (const struct CadetPeer *peer)
2019 struct CadetPeerPath *path;
2021 if (NULL == peer->connections)
2024 for (path = peer->path_head; NULL != path; path = path->next)
2026 if (3 > path->length)
2030 /* Is not a neighbor but connections is not NULL, probably disconnecting */
2037 * Create and initialize a new tunnel towards a peer, in case it has none.
2038 * In case the peer already has a tunnel, nothing is done.
2040 * Does not generate any traffic, just creates the local data structures.
2042 * @param peer Peer towards which to create the tunnel.
2045 GCP_add_tunnel (struct CadetPeer *peer)
2047 GCC_check_connections ();
2048 if (NULL != peer->tunnel)
2050 peer->tunnel = GCT_new (peer);
2051 GCC_check_connections ();
2056 * Add a connection to a neighboring peer.
2058 * Store that the peer is the first hop of the connection in one
2059 * direction and that on peer disconnect the connection must be
2060 * notified and destroyed, for it will no longer be valid.
2062 * @param peer Peer to add connection to.
2063 * @param c Connection to add.
2064 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
2067 GCP_add_connection (struct CadetPeer *peer,
2068 struct CadetConnection *c,
2071 LOG (GNUNET_ERROR_TYPE_DEBUG,
2072 "adding connection %s\n",
2074 LOG (GNUNET_ERROR_TYPE_DEBUG,
2077 GNUNET_assert (NULL != peer->connections);
2078 GNUNET_assert (GNUNET_OK ==
2079 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2082 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2083 LOG (GNUNET_ERROR_TYPE_DEBUG,
2084 "Peer %s has now %u connections.\n",
2086 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2091 * Add the path to the peer and update the path used to reach it in case this
2094 * @param peer Destination peer to add the path to.
2095 * @param path New path to add. Last peer must be @c peer.
2096 * Path will be either used of freed if already known.
2097 * @param trusted Do we trust that this path is real?
2099 * @return path if path was taken, pointer to existing duplicate if exists
2102 struct CadetPeerPath *
2103 GCP_add_path (struct CadetPeer *peer,
2104 struct CadetPeerPath *path,
2107 struct CadetPeerPath *aux;
2111 GCC_check_connections ();
2112 LOG (GNUNET_ERROR_TYPE_DEBUG,
2113 "adding path [%u] to peer %s\n",
2114 path->length, GCP_2s (peer));
2116 if (NULL == peer || NULL == path
2117 || path->peers[path->length - 1] != peer->id)
2120 path_destroy (path);
2124 for (l = 1; l < path->length; l++)
2126 if (path->peers[l] == myid)
2128 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2129 for (l2 = 0; l2 < path->length - l; l2++)
2131 path->peers[l2] = path->peers[l + l2];
2135 path->peers = GNUNET_realloc (path->peers,
2136 path->length * sizeof (GNUNET_PEER_Id));
2140 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2142 if (2 >= path->length && GNUNET_NO == trusted)
2144 /* Only allow CORE to tell us about direct paths */
2145 path_destroy (path);
2149 l = path_get_length (path);
2152 path_destroy (path);
2156 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2157 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2159 l2 = path_get_length (aux);
2162 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2163 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2164 peer->path_tail, aux, path);
2169 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2171 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2172 path_destroy (path);
2177 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2179 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2182 if (NULL != peer->tunnel
2183 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel)
2184 && 2 < path->length) /* Direct paths are handled by core_connect */
2188 GCC_check_connections ();
2194 * Add the path to the origin peer and update the path used to reach it in case
2195 * this is the shortest.
2196 * The path is given in peer_info -> destination, therefore we turn the path
2197 * upside down first.
2199 * @param peer Peer to add the path to, being the origin of the path.
2200 * @param path New path to add after being inversed.
2201 * Path will be either used or freed.
2202 * @param trusted Do we trust that this path is real?
2204 * @return path if path was taken, pointer to existing duplicate if exists
2207 struct CadetPeerPath *
2208 GCP_add_path_to_origin (struct CadetPeer *peer,
2209 struct CadetPeerPath *path,
2215 return GCP_add_path (peer, path, trusted);
2220 * Adds a path to the info of all the peers in the path
2222 * @param p Path to process.
2223 * @param confirmed Whether we know if the path works or not.
2226 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2230 /* TODO: invert and add */
2231 GCC_check_connections ();
2232 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2233 for (i++; i < p->length; i++)
2235 struct CadetPeer *peer;
2236 struct CadetPeerPath *copy;
2238 peer = GCP_get_short (p->peers[i], GNUNET_YES);
2239 copy = path_duplicate (p);
2240 copy->length = i + 1;
2241 GCP_add_path (peer, copy, 3 > p->length ? GNUNET_NO : confirmed);
2243 GCC_check_connections ();
2248 * Remove any path to the peer that has the exact same peers as the one given.
2250 * @param peer Peer to remove the path from.
2251 * @param path Path to remove. Is always destroyed .
2254 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2256 struct CadetPeerPath *iter;
2257 struct CadetPeerPath *next;
2259 GCC_check_connections ();
2260 GNUNET_assert (myid == path->peers[0]);
2261 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2263 LOG (GNUNET_ERROR_TYPE_INFO, "Removing path %p (%u) from %s\n",
2264 path, path->length, GCP_2s (peer));
2266 for (iter = peer->path_head; NULL != iter; iter = next)
2269 if (0 == path_cmp (path, iter))
2271 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2273 path_destroy (iter);
2276 path_destroy (path);
2277 GCC_check_connections ();
2282 * Check that we are aware of a connection from a neighboring peer.
2284 * @param peer Peer to the connection is with
2285 * @param c Connection that should be in the map with this peer.
2288 GCP_check_connection (const struct CadetPeer *peer,
2289 const struct CadetConnection *c)
2291 GNUNET_assert (NULL != peer);
2292 GNUNET_assert (NULL != peer->connections);
2294 GNUNET_assert (GNUNET_YES ==
2295 GNUNET_CONTAINER_multihashmap_contains_value (peer->connections,
2302 * Remove a connection from a neighboring peer.
2304 * @param peer Peer to remove connection from.
2305 * @param c Connection to remove.
2308 GCP_remove_connection (struct CadetPeer *peer,
2309 const struct CadetConnection *c)
2311 LOG (GNUNET_ERROR_TYPE_DEBUG,
2312 "Removing connection %s\n",
2314 LOG (GNUNET_ERROR_TYPE_DEBUG,
2317 if ( (NULL == peer) ||
2318 (NULL == peer->connections) )
2320 GNUNET_assert (GNUNET_YES ==
2321 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2324 LOG (GNUNET_ERROR_TYPE_DEBUG,
2325 "Peer %s remains with %u connections.\n",
2327 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2332 * Start the DHT search for new paths towards the peer: we don't have
2333 * enough good connections.
2335 * @param peer Destination peer.
2338 GCP_start_search (struct CadetPeer *peer)
2340 const struct GNUNET_PeerIdentity *id;
2341 struct CadetTunnel *t = peer->tunnel;
2343 GCC_check_connections ();
2344 if (NULL != peer->search_h)
2350 if (NULL != peer->search_delayed)
2351 GCP_stop_search (peer);
2353 id = GNUNET_PEER_resolve2 (peer->id);
2354 peer->search_h = GCD_search (id, &search_handler, peer);
2358 /* Why would we search for a peer with no tunnel towards it? */
2363 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2364 || 0 == GCT_count_any_connections (t))
2366 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2368 GCC_check_connections ();
2373 * Stop the DHT search for new paths towards the peer: we already have
2374 * enough good connections.
2376 * @param peer Destination peer.
2379 GCP_stop_search (struct CadetPeer *peer)
2381 GCC_check_connections ();
2382 if (NULL != peer->search_h)
2384 GCD_search_stop (peer->search_h);
2385 peer->search_h = NULL;
2387 if (NULL != peer->search_delayed)
2389 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2390 peer->search_delayed = NULL;
2392 GCC_check_connections ();
2397 * Get the Full ID of a peer.
2399 * @param peer Peer to get from.
2401 * @return Full ID of peer.
2403 const struct GNUNET_PeerIdentity *
2404 GCP_get_id (const struct CadetPeer *peer)
2406 return GNUNET_PEER_resolve2 (peer->id);
2411 * Get the Short ID of a peer.
2413 * @param peer Peer to get from.
2415 * @return Short ID of peer.
2418 GCP_get_short_id (const struct CadetPeer *peer)
2427 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2433 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2436 if (NULL == t && GNUNET_YES == is_searching (peer))
2438 GCP_stop_search (peer);
2444 * Get the tunnel towards a peer.
2446 * @param peer Peer to get from.
2448 * @return Tunnel towards peer.
2450 struct CadetTunnel *
2451 GCP_get_tunnel (const struct CadetPeer *peer)
2455 return peer->tunnel;
2460 * Set the hello message.
2462 * @param peer Peer whose message to set.
2463 * @param hello Hello message.
2466 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2468 struct GNUNET_HELLO_Message *old;
2471 GCC_check_connections ();
2472 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2476 old = GCP_get_hello (peer);
2479 size = GNUNET_HELLO_size (hello);
2480 peer->hello = GNUNET_malloc (size);
2481 memcpy (peer->hello, hello, size);
2485 peer->hello = GNUNET_HELLO_merge (old, hello);
2488 GCC_check_connections ();
2493 * Get the hello message.
2495 * @param peer Peer whose message to get.
2497 * @return Hello message.
2499 struct GNUNET_HELLO_Message *
2500 GCP_get_hello (struct CadetPeer *peer)
2502 struct GNUNET_TIME_Absolute expiration;
2503 struct GNUNET_TIME_Relative remaining;
2505 if (NULL == peer->hello)
2508 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2509 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2510 if (0 == remaining.rel_value_us)
2512 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2513 GNUNET_STRINGS_absolute_time_to_string (expiration));
2514 GNUNET_free (peer->hello);
2522 * Try to connect to a peer on TRANSPORT level.
2524 * @param peer Peer to whom to connect.
2527 GCP_try_connect (struct CadetPeer *peer)
2529 struct GNUNET_HELLO_Message *hello;
2530 struct GNUNET_MessageHeader *mh;
2532 if (NULL == transport_handle)
2534 GCC_check_connections ();
2535 if (GNUNET_YES == GCP_is_neighbor (peer))
2537 hello = GCP_get_hello (peer);
2541 mh = GNUNET_HELLO_get_header (hello);
2542 GNUNET_TRANSPORT_offer_hello (transport_handle,
2546 GCC_check_connections ();
2551 * Notify a peer that a link between two other peers is broken. If any path
2552 * used that link, eliminate it.
2554 * @param peer Peer affected by the change.
2555 * @param peer1 Peer whose link is broken.
2556 * @param peer2 Peer whose link is broken.
2559 GCP_notify_broken_link (struct CadetPeer *peer,
2560 const struct GNUNET_PeerIdentity *peer1,
2561 const struct GNUNET_PeerIdentity *peer2)
2563 struct CadetPeerPath *iter;
2564 struct CadetPeerPath *next;
2569 GCC_check_connections ();
2570 p1 = GNUNET_PEER_search (peer1);
2571 p2 = GNUNET_PEER_search (peer2);
2573 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2574 if (0 == p1 || 0 == p2)
2576 /* We don't even know them */
2580 for (iter = peer->path_head; NULL != iter; iter = next)
2583 for (i = 0; i < iter->length - 1; i++)
2585 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2586 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2591 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2594 path_invalidate (iter);
2598 GCC_check_connections ();
2603 * Count the number of known paths toward the peer.
2605 * @param peer Peer to get path info.
2607 * @return Number of known paths.
2610 GCP_count_paths (const struct CadetPeer *peer)
2612 struct CadetPeerPath *iter;
2615 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2623 * Iterate over the paths to a peer.
2625 * @param peer Peer to get path info.
2626 * @param callback Function to call for every path.
2627 * @param cls Closure for @a callback.
2629 * @return Number of iterated paths.
2632 GCP_iterate_paths (struct CadetPeer *peer,
2633 GCP_path_iterator callback,
2636 struct CadetPeerPath *iter;
2639 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2642 if (GNUNET_YES != callback (cls, peer, iter))
2651 * Iterate all known peers.
2653 * @param iter Iterator.
2654 * @param cls Closure for @c iter.
2657 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2660 GCC_check_connections ();
2661 GNUNET_CONTAINER_multipeermap_iterate (peers,
2664 GCC_check_connections ();
2669 * Get the static string for a peer ID.
2673 * @return Static string for it's ID.
2676 GCP_2s (const struct CadetPeer *peer)
2680 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2684 /* end of gnunet-service-cadet_peer.c */