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);
438 GNUNET_assert (NULL == neighbor->connections);
439 neighbor->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
440 GNUNET_assert (NULL != neighbor->connections);
442 GNUNET_STATISTICS_update (stats,
447 if ( (NULL != GCP_get_tunnel (neighbor)) &&
448 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
449 GCP_connect (neighbor);
450 GCC_check_connections ();
455 * Method called whenever a peer disconnects.
458 * @param peer peer identity this notification is about
461 core_disconnect (void *cls,
462 const struct GNUNET_PeerIdentity *peer)
465 struct CadetPeerPath *direct_path;
468 GCC_check_connections ();
469 strncpy (own_id, GNUNET_i2s (&my_full_id), 16);
471 p = GNUNET_CONTAINER_multipeermap_get (peers, peer);
474 GNUNET_break (GNUNET_YES == in_shutdown);
478 LOG (GNUNET_ERROR_TYPE_INFO,
479 "DISCONNECTED %s (self)\n",
482 LOG (GNUNET_ERROR_TYPE_INFO,
483 "DISCONNECTED %s <= %s\n",
484 own_id, GNUNET_i2s (peer));
485 direct_path = pop_direct_path (p);
486 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
489 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
490 p->connections = NULL;
491 if (NULL != p->core_transmit)
493 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
494 p->core_transmit = NULL;
495 p->tmt_time.abs_value_us = 0;
497 GNUNET_STATISTICS_update (stats,
501 path_destroy (direct_path);
502 GCC_check_connections ();
507 * Functions to handle messages from core
509 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
510 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
511 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
512 sizeof (struct GNUNET_CADET_ConnectionACK)},
513 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
514 sizeof (struct GNUNET_CADET_ConnectionBroken)},
515 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
516 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
517 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
518 sizeof (struct GNUNET_CADET_ACK)},
519 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
520 sizeof (struct GNUNET_CADET_Poll)},
521 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
522 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
523 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0},
529 * To be called on core init/fail.
531 * @param cls Closure (config)
532 * @param identity the public identity of this peer
535 core_init (void *cls,
536 const struct GNUNET_PeerIdentity *identity)
538 const struct GNUNET_CONFIGURATION_Handle *c = cls;
541 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
542 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
544 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
545 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
546 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
547 GNUNET_CORE_disconnect (core_handle);
548 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
549 NULL, /* Closure passed to CADET functions */
550 &core_init, /* Call core_init once connected */
551 &core_connect, /* Handle connects */
552 &core_disconnect, /* remove peers on disconnects */
553 NULL, /* Don't notify about all incoming messages */
554 GNUNET_NO, /* For header only in notification */
555 NULL, /* Don't notify about all outbound messages */
556 GNUNET_NO, /* For header-only out notification */
557 core_handlers); /* Register these handlers */
566 * Core callback to write a pre-constructed data packet to core buffer
568 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
569 * @param size Number of bytes available in buf.
570 * @param buf Where the to write the message.
572 * @return number of bytes written to buf
575 send_core_data_raw (void *cls, size_t size, void *buf)
577 struct GNUNET_MessageHeader *msg = cls;
580 GNUNET_assert (NULL != msg);
581 total_size = ntohs (msg->size);
583 if (total_size > size)
588 memcpy (buf, msg, total_size);
595 * Function to send a create connection message to a peer.
597 * @param c Connection to create.
598 * @param size number of bytes available in buf
599 * @param buf where the callee should write the message
600 * @return number of bytes written to buf
603 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
605 struct GNUNET_CADET_ConnectionCreate *msg;
606 struct GNUNET_PeerIdentity *peer_ptr;
607 const struct CadetPeerPath *p = GCC_get_path (c);
614 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
616 sizeof (struct GNUNET_CADET_ConnectionCreate) +
617 p->length * sizeof (struct GNUNET_PeerIdentity);
619 if (size < size_needed || NULL == buf)
624 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
625 msg->header.size = htons (size_needed);
626 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
627 msg->cid = *GCC_get_id (c);
629 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
630 for (i = 0; i < p->length; i++)
632 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
635 LOG (GNUNET_ERROR_TYPE_DEBUG,
636 "CONNECTION CREATE (%u bytes long) sent!\n",
643 * Creates a path ack message in buf and frees all unused resources.
645 * @param c Connection to send an ACK on.
646 * @param size number of bytes available in buf
647 * @param buf where the callee should write the message
649 * @return number of bytes written to buf
652 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
654 struct GNUNET_CADET_ConnectionACK *msg = buf;
656 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
657 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
662 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
663 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
664 msg->cid = *GCC_get_id (c);
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
667 return sizeof (struct GNUNET_CADET_ConnectionACK);
671 /******************************************************************************/
672 /******************************** STATIC ***********************************/
673 /******************************************************************************/
677 * Get priority for a queued message.
679 * @param q Queued message
681 * @return CORE priority to use.
683 static enum GNUNET_CORE_Priority
684 get_priority (struct CadetPeerQueue *q)
686 enum GNUNET_CORE_Priority low;
687 enum GNUNET_CORE_Priority high;
692 return GNUNET_CORE_PRIO_BACKGROUND;
695 /* Relayed traffic has lower priority, our own traffic has higher */
696 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
698 low = GNUNET_CORE_PRIO_BEST_EFFORT;
699 high = GNUNET_CORE_PRIO_URGENT;
703 low = GNUNET_CORE_PRIO_URGENT;
704 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
707 /* Bulky payload has lower priority, control traffic has higher. */
708 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
709 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
717 * Destroy the peer_info and free any allocated resources linked to it
719 * @param peer The peer_info to destroy.
720 * @return #GNUNET_OK on success
723 peer_destroy (struct CadetPeer *peer)
725 struct GNUNET_PeerIdentity id;
726 struct CadetPeerPath *p;
727 struct CadetPeerPath *nextp;
729 GNUNET_PEER_resolve (peer->id, &id);
730 GNUNET_PEER_change_rc (peer->id, -1);
732 LOG (GNUNET_ERROR_TYPE_INFO,
733 "destroying peer %s\n",
736 if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer))
739 LOG (GNUNET_ERROR_TYPE_WARNING, " peer not in peermap!!\n");
741 GCP_stop_search (peer);
746 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
750 if (NULL != peer->tunnel)
751 GCT_destroy_empty (peer->tunnel);
752 if (NULL != peer->connections)
754 GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (peer->connections));
755 GNUNET_CONTAINER_multihashmap_destroy (peer->connections);
757 GNUNET_free_non_null (peer->hello);
764 * Iterator over peer hash map entries to destroy the peer during in_shutdown.
767 * @param key current key code
768 * @param value value in the hash map
769 * @return #GNUNET_YES if we should continue to iterate,
773 shutdown_peer (void *cls,
774 const struct GNUNET_PeerIdentity *key,
777 struct CadetPeer *p = value;
778 struct CadetTunnel *t = p->tunnel;
790 * Check if peer is searching for a path (either active or delayed search).
792 * @param peer Peer to check
793 * @return #GNUNET_YES if there is a search active.
794 * #GNUNET_NO otherwise.
797 is_searching (const struct CadetPeer *peer)
799 return ( (NULL == peer->search_h) &&
800 (NULL == peer->search_delayed) ) ?
801 GNUNET_NO : GNUNET_YES;
806 * @brief Start a search for a peer.
808 * @param cls Closure (Peer to search for).
809 * @param tc Task context.
812 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
814 struct CadetPeer *peer = cls;
816 peer->search_delayed = NULL;
817 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
819 GCC_check_connections ();
820 GCP_start_search (peer);
821 GCC_check_connections ();
826 * Returns if peer is used (has a tunnel or is neighbor).
828 * @param peer Peer to check.
829 * @return #GNUNET_YES if peer is in use.
832 peer_is_used (struct CadetPeer *peer)
834 struct CadetPeerPath *p;
836 if (NULL != peer->tunnel)
839 for (p = peer->path_head; NULL != p; p = p->next)
849 * Iterator over all the peers to get the oldest timestamp.
851 * @param cls Closure (unsued).
852 * @param key ID of the peer.
853 * @param value Peer_Info of the peer.
856 peer_get_oldest (void *cls,
857 const struct GNUNET_PeerIdentity *key,
860 struct CadetPeer *p = value;
861 struct GNUNET_TIME_Absolute *abs = cls;
863 /* Don't count active peers */
864 if (GNUNET_YES == peer_is_used (p))
867 if (abs->abs_value_us < p->last_contact.abs_value_us)
868 abs->abs_value_us = p->last_contact.abs_value_us;
875 * Iterator over all the peers to remove the oldest entry.
877 * @param cls Closure (unsued).
878 * @param key ID of the peer.
879 * @param value Peer_Info of the peer.
882 peer_timeout (void *cls,
883 const struct GNUNET_PeerIdentity *key,
886 struct CadetPeer *p = value;
887 struct GNUNET_TIME_Absolute *abs = cls;
889 LOG (GNUNET_ERROR_TYPE_WARNING,
890 "peer %s timeout\n", GNUNET_i2s (key));
892 if (p->last_contact.abs_value_us == abs->abs_value_us &&
893 GNUNET_NO == peer_is_used (p))
903 * Delete oldest unused peer.
906 peer_delete_oldest (void)
908 struct GNUNET_TIME_Absolute abs;
910 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
912 GNUNET_CONTAINER_multipeermap_iterate (peers,
915 GNUNET_CONTAINER_multipeermap_iterate (peers,
922 * Choose the best (yet unused) path towards a peer,
923 * considering the tunnel properties.
925 * @param peer The destination peer.
926 * @return Best current known path towards the peer, if any.
928 static struct CadetPeerPath *
929 peer_get_best_path (const struct CadetPeer *peer)
931 struct CadetPeerPath *best_p;
932 struct CadetPeerPath *p;
933 unsigned int best_cost;
936 best_cost = UINT_MAX;
938 for (p = peer->path_head; NULL != p; p = p->next)
940 if (GNUNET_NO == path_is_valid (p))
941 continue; /* Don't use invalid paths. */
942 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
943 continue; /* If path is already in use, skip it. */
945 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
956 * Is this queue element sendable?
958 * - All management traffic is always sendable.
959 * - For payload traffic, check the connection flow control.
961 * @param q Queue element to inspect.
962 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
965 queue_is_sendable (struct CadetPeerQueue *q)
967 /* Is PID-independent? */
970 case GNUNET_MESSAGE_TYPE_CADET_ACK:
971 case GNUNET_MESSAGE_TYPE_CADET_POLL:
972 case GNUNET_MESSAGE_TYPE_CADET_KX:
973 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
974 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
975 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
976 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
979 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
980 case GNUNET_MESSAGE_TYPE_CADET_AX:
987 return GCC_is_sendable (q->c, q->fwd);
992 * Get first sendable message.
994 * @param peer The destination peer.
996 * @return First transmittable message, if any. Otherwise, NULL.
998 static struct CadetPeerQueue *
999 peer_get_first_message (const struct CadetPeer *peer)
1001 struct CadetPeerQueue *q;
1003 for (q = peer->queue_head; NULL != q; q = q->next)
1005 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
1006 if (queue_is_sendable (q))
1015 * Function to process paths received for a new peer addition. The recorded
1016 * paths form the initial tunnel, which can be optimized later.
1017 * Called on each result obtained for the DHT search.
1019 * @param cls closure
1023 search_handler (void *cls, const struct CadetPeerPath *path)
1025 struct CadetPeer *peer = cls;
1026 unsigned int connection_count;
1028 GCC_check_connections ();
1029 GCP_add_path_to_all (path, GNUNET_NO);
1031 /* Count connections */
1032 connection_count = GCT_count_connections (peer->tunnel);
1034 /* If we already have our minimum (or more) connections, it's enough */
1035 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1037 GCC_check_connections ();
1041 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1043 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1046 GCC_check_connections ();
1051 * Adjust core requested size to accomodate an ACK.
1053 * @param message_size Requested size.
1055 * @return Size enough to fit @c message_size and an ACK.
1058 get_core_size (size_t message_size)
1060 return message_size + sizeof (struct GNUNET_CADET_ACK);
1065 * Fill a core buffer with the appropriate data for the queued message.
1067 * @param queue Queue element for the message.
1068 * @param buf Core buffer to fill.
1069 * @param size Size remaining in @c buf.
1070 * @param[out] pid In case its an encrypted payload, set payload.
1072 * @return Bytes written to @c buf.
1075 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1077 struct CadetConnection *c = queue->c;
1080 switch (queue->type)
1082 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1083 *pid = GCC_get_pid (queue->c, queue->fwd);
1084 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1085 msg_size = send_core_data_raw (queue->cls, size, buf);
1086 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1088 case GNUNET_MESSAGE_TYPE_CADET_AX:
1089 *pid = GCC_get_pid (queue->c, queue->fwd);
1090 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1091 msg_size = send_core_data_raw (queue->cls, size, buf);
1092 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1094 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1095 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1096 case GNUNET_MESSAGE_TYPE_CADET_KX:
1097 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1098 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1099 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1100 msg_size = send_core_data_raw (queue->cls, size, buf);
1102 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1103 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1104 if (GCC_is_origin (c, GNUNET_YES))
1105 msg_size = send_core_connection_create (c, size, buf);
1107 msg_size = send_core_data_raw (queue->cls, size, buf);
1109 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1110 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1111 if (GCC_is_origin (c, GNUNET_NO) ||
1112 GCC_is_origin (c, GNUNET_YES))
1114 msg_size = send_core_connection_ack (c, size, buf);
1118 msg_size = send_core_data_raw (queue->cls, size, buf);
1121 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1122 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1123 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1124 /* This should be encapsulted */
1130 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1134 GNUNET_assert (size >= msg_size);
1141 * Core callback to write a queued packet to core buffer
1143 * @param cls Closure (peer info).
1144 * @param size Number of bytes available in buf.
1145 * @param buf Where the to write the message.
1147 * @return number of bytes written to buf
1150 queue_send (void *cls, size_t size, void *buf)
1152 struct CadetPeer *peer = cls;
1153 struct CadetConnection *c;
1154 struct CadetPeerQueue *queue;
1155 struct GNUNET_TIME_Relative core_wait_time;
1157 const struct GNUNET_PeerIdentity *dst_id;
1164 GCC_check_connections ();
1165 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1166 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1167 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1168 GCP_2s (peer), size);
1170 /* Sanity checking */
1171 if (NULL == buf || 0 == size)
1173 LOG (GNUNET_ERROR_TYPE_DEBUG, " not allowed/\n");
1174 if (GNUNET_NO == in_shutdown)
1176 queue = peer_get_first_message (peer);
1179 peer->core_transmit = NULL;
1180 peer->tmt_time.abs_value_us = 0;
1181 GCC_check_connections ();
1184 dst_id = GNUNET_PEER_resolve2 (peer->id);
1185 peer->core_transmit =
1186 GNUNET_CORE_notify_transmit_ready (core_handle,
1187 GNUNET_NO, get_priority (queue),
1188 GNUNET_TIME_UNIT_FOREVER_REL,
1190 get_core_size (queue->size),
1193 peer->tmt_time = GNUNET_TIME_absolute_get ();
1197 peer->core_transmit = NULL;
1198 peer->tmt_time.abs_value_us = 0;
1200 GCC_check_connections ();
1209 peer->core_transmit = NULL;
1210 queue = peer_get_first_message (peer);
1213 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1214 peer->tmt_time.abs_value_us = 0;
1217 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1218 wait_s = GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_YES);
1219 if (core_wait_time.rel_value_us >= 1000000)
1221 LOG (GNUNET_ERROR_TYPE_ERROR,
1222 " %s: core wait time %s (> 1 second) for %u bytes\n",
1223 GCP_2s (peer), wait_s, queue->size);
1225 peer->tmt_time.abs_value_us = 0;
1227 /* Copy all possible messages to the core buffer */
1228 while (NULL != queue && rest >= queue->size)
1232 LOG (GNUNET_ERROR_TYPE_DEBUG, " on conn %s %s\n",
1233 GCC_2s (c), GC_f2s(queue->fwd));
1234 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1235 queue->size, total_size, size);
1237 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1239 if (0 < drop_percent &&
1240 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1242 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on conn %s %s\n",
1243 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1244 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1249 LOG (GNUNET_ERROR_TYPE_INFO,
1250 ">>> %s (%s %4u) on conn %s (%p) %s (%u bytes), after %s\n",
1251 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1252 queue->payload_id, GCC_2s (c), c,
1253 GC_f2s (queue->fwd), msg_size, wait_s);
1255 total_size += msg_size;
1257 dst = &dst[msg_size];
1260 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1261 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1264 queue = peer_get_first_message (peer);
1267 /* If more data in queue, send next */
1270 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1271 if (NULL == peer->core_transmit)
1273 dst_id = GNUNET_PEER_resolve2 (peer->id);
1274 peer->core_transmit =
1275 GNUNET_CORE_notify_transmit_ready (core_handle,
1276 GNUNET_NO, get_priority (queue),
1277 GNUNET_TIME_UNIT_FOREVER_REL,
1279 get_core_size (queue->size),
1282 peer->tmt_time = GNUNET_TIME_absolute_get ();
1283 queue->start_waiting = GNUNET_TIME_absolute_get ();
1287 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1289 // GCC_start_poll (); FIXME needed?
1293 // GCC_stop_poll(); FIXME needed?
1296 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1297 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1298 GCC_check_connections ();
1303 /******************************************************************************/
1304 /******************************** API ***********************************/
1305 /******************************************************************************/
1309 * Free a transmission that was already queued with all resources
1310 * associated to the request.
1312 * If connection was marked to be destroyed, and this was the last queued
1313 * message on it, the connection will be free'd as a result.
1315 * @param queue Queue handler to cancel.
1316 * @param clear_cls Is it necessary to free associated cls?
1317 * @param sent Was it really sent? (Could have been canceled)
1318 * @param pid PID, if relevant (was sent and was a payload message).
1320 * @return #GNUNET_YES if connection was destroyed as a result,
1321 * #GNUNET_NO otherwise.
1324 GCP_queue_destroy (struct CadetPeerQueue *queue,
1329 struct CadetPeer *peer;
1330 int connection_destroyed;
1332 GCC_check_connections ();
1334 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1335 if (GNUNET_YES == clear_cls)
1337 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1338 switch (queue->type)
1340 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1341 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1343 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1344 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1345 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1346 case GNUNET_MESSAGE_TYPE_CADET_KX:
1347 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1348 case GNUNET_MESSAGE_TYPE_CADET_AX:
1349 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1350 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1351 GNUNET_free_non_null (queue->cls);
1356 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1357 GC_m2s (queue->type));
1360 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1362 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1363 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1368 if (NULL != queue->cont)
1370 struct GNUNET_TIME_Relative wait_time;
1372 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1373 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1374 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1375 connection_destroyed = queue->cont (queue->cont_cls,
1376 queue->c, sent, queue->type, pid,
1377 queue->fwd, queue->size, wait_time);
1381 connection_destroyed = GNUNET_NO;
1384 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1386 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1387 peer->core_transmit = NULL;
1388 peer->tmt_time.abs_value_us = 0;
1391 GNUNET_free (queue);
1392 GCC_check_connections ();
1393 return connection_destroyed;
1398 * @brief Queue and pass message to core when possible.
1400 * @param peer Peer towards which to queue the message.
1401 * @param cls Closure (@c type dependant). It will be used by queue_send to
1402 * build the message to be sent if not already prebuilt.
1403 * @param type Type of the message, 0 for a raw message.
1404 * @param size Size of the message.
1405 * @param c Connection this message belongs to (can be NULL).
1406 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1407 * @param cont Continuation to be called once CORE has taken the message.
1408 * @param cont_cls Closure for @c cont.
1410 * @return Handle to cancel the message before it is sent. Once cont is called
1411 * message has been sent and therefore the handle is no longer valid.
1413 struct CadetPeerQueue *
1414 GCP_queue_add (struct CadetPeer *peer,
1417 uint16_t payload_type,
1418 uint32_t payload_id,
1420 struct CadetConnection *c,
1425 struct CadetPeerQueue *q;
1429 GCC_check_connections ();
1430 LOG (GNUNET_ERROR_TYPE_DEBUG,
1431 "que %s (%s %4u) on conn %s (%p) %s towards %s (size %u)\n",
1432 GC_m2s (type), GC_m2s (payload_type), payload_id,
1433 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1435 if (NULL == peer->connections)
1437 /* We are not connected to this peer, ignore request. */
1438 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1439 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1446 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1447 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1452 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1454 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1455 GNUNET_YES : GCC_is_sendable (c, fwd);
1456 q = GNUNET_new (struct CadetPeerQueue);
1459 q->payload_type = payload_type;
1460 q->payload_id = payload_id;
1466 q->cont_cls = cont_cls;
1469 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1474 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1475 call_core = GNUNET_YES;
1478 q->start_waiting = GNUNET_TIME_absolute_get ();
1479 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1481 LOG (GNUNET_ERROR_TYPE_DEBUG,
1482 "calling core tmt rdy towards %s for %u bytes\n",
1483 GCP_2s (peer), size);
1484 peer->core_transmit =
1485 GNUNET_CORE_notify_transmit_ready (core_handle,
1486 GNUNET_NO, get_priority (q),
1487 GNUNET_TIME_UNIT_FOREVER_REL,
1488 GNUNET_PEER_resolve2 (peer->id),
1489 get_core_size (size),
1491 peer->tmt_time = GNUNET_TIME_absolute_get ();
1493 else if (GNUNET_NO == call_core)
1495 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1501 struct GNUNET_TIME_Relative elapsed;
1502 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1503 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1505 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1508 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1509 GCC_check_connections ();
1515 * Cancel all queued messages to a peer that belong to a certain connection.
1517 * @param peer Peer towards whom to cancel.
1518 * @param c Connection whose queued messages to cancel. Might be destroyed by
1519 * the sent continuation call.
1522 GCP_queue_cancel (struct CadetPeer *peer,
1523 struct CadetConnection *c)
1525 struct CadetPeerQueue *q;
1526 struct CadetPeerQueue *next;
1527 struct CadetPeerQueue *prev;
1528 int connection_destroyed;
1530 GCC_check_connections ();
1531 connection_destroyed = GNUNET_NO;
1532 for (q = peer->queue_head; NULL != q; q = next)
1537 LOG (GNUNET_ERROR_TYPE_DEBUG,
1538 "GMP queue cancel %s\n",
1540 GNUNET_break (GNUNET_NO == connection_destroyed);
1541 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1547 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1550 /* Get next from prev, q->next might be already freed:
1551 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1554 next = peer->queue_head;
1564 if ( (NULL == peer->queue_head) &&
1565 (NULL != peer->core_transmit) )
1567 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1568 peer->core_transmit = NULL;
1569 peer->tmt_time.abs_value_us = 0;
1571 GCC_check_connections ();
1576 * Get the first transmittable message for a connection.
1578 * @param peer Neighboring peer.
1579 * @param c Connection.
1581 * @return First transmittable message.
1583 static struct CadetPeerQueue *
1584 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1586 struct CadetPeerQueue *q;
1588 for (q = peer->queue_head; NULL != q; q = q->next)
1592 if (queue_is_sendable (q))
1594 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1597 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1605 * Get the first message for a connection and unqueue it.
1607 * Only tunnel (or higher) level messages are unqueued. Connection specific
1608 * messages are silently destroyed upon encounter.
1610 * @param peer Neighboring peer.
1611 * @param c Connection.
1612 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1615 * @return First message for this connection.
1617 struct GNUNET_MessageHeader *
1618 GCP_connection_pop (struct CadetPeer *peer,
1619 struct CadetConnection *c,
1622 struct CadetPeerQueue *q;
1623 struct CadetPeerQueue *next;
1624 struct GNUNET_MessageHeader *msg;
1627 GCC_check_connections ();
1628 GNUNET_assert (NULL != destroyed);
1629 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on conn %p\n", c);
1630 for (q = peer->queue_head; NULL != q; q = next)
1635 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1636 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1640 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1641 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1642 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1643 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1644 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1645 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1646 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1647 if (GNUNET_YES == dest)
1649 GNUNET_break (GNUNET_NO == *destroyed);
1650 *destroyed = GNUNET_YES;
1654 case GNUNET_MESSAGE_TYPE_CADET_KX:
1655 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1656 case GNUNET_MESSAGE_TYPE_CADET_AX:
1657 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1658 msg = (struct GNUNET_MessageHeader *) q->cls;
1659 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1660 if (GNUNET_YES == dest)
1662 GNUNET_break (GNUNET_NO == *destroyed);
1663 *destroyed = GNUNET_YES;
1669 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1672 GCC_check_connections ();
1678 * Unlock a possibly locked queue for a connection.
1680 * If there is a message that can be sent on this connection, call core for it.
1681 * Otherwise (if core transmit is already called or there is no sendable
1682 * message) do nothing.
1684 * @param peer Peer who keeps the queue.
1685 * @param c Connection whose messages to unlock.
1688 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1690 struct CadetPeerQueue *q;
1693 GCC_check_connections ();
1694 if (NULL != peer->core_transmit)
1696 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1697 return; /* Already unlocked */
1700 q = connection_get_first_message (peer, c);
1703 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1704 return; /* Nothing to transmit */
1708 peer->core_transmit =
1709 GNUNET_CORE_notify_transmit_ready (core_handle,
1710 GNUNET_NO, get_priority (q),
1711 GNUNET_TIME_UNIT_FOREVER_REL,
1712 GNUNET_PEER_resolve2 (peer->id),
1713 get_core_size (size),
1716 peer->tmt_time = GNUNET_TIME_absolute_get ();
1717 GCC_check_connections ();
1722 * Initialize the peer subsystem.
1724 * @param c Configuration.
1727 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1729 LOG (GNUNET_ERROR_TYPE_DEBUG,
1731 in_shutdown = GNUNET_NO;
1732 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1734 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1737 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1738 "CADET", "MAX_PEERS", "USING DEFAULT");
1743 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1750 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1751 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1752 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1753 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1754 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1757 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1758 NULL, /* Closure passed to CADET functions */
1759 &core_init, /* Call core_init once connected */
1760 &core_connect, /* Handle connects */
1761 &core_disconnect, /* remove peers on disconnects */
1762 NULL, /* Don't notify about all incoming messages */
1763 GNUNET_NO, /* For header only in notification */
1764 NULL, /* Don't notify about all outbound messages */
1765 GNUNET_NO, /* For header-only out notification */
1766 core_handlers); /* Register these handlers */
1768 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1770 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1771 /* Notify callbacks */
1776 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1777 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1778 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1779 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1780 transport_handle = NULL;
1785 if (NULL == core_handle)
1788 GNUNET_SCHEDULER_shutdown ();
1796 * Shut down the peer subsystem.
1801 in_shutdown = GNUNET_YES;
1802 GNUNET_CONTAINER_multipeermap_iterate (peers,
1805 if (NULL != core_handle)
1807 GNUNET_CORE_disconnect (core_handle);
1810 if (NULL != transport_handle)
1812 GNUNET_TRANSPORT_disconnect (transport_handle);
1813 transport_handle = NULL;
1815 GNUNET_PEER_change_rc (myid, -1);
1816 GNUNET_CONTAINER_multipeermap_destroy (peers);
1822 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1823 * one and insert it in the appropriate structures if the peer is not known yet.
1825 * @param peer_id Full identity of the peer.
1826 * @param create #GNUNET_YES if a new peer should be created if unknown.
1827 * #GNUNET_NO otherwise.
1829 * @return Existing or newly created peer structure.
1830 * NULL if unknown and not requested @a create
1833 GCP_get (const struct GNUNET_PeerIdentity *peer_id, int create)
1835 struct CadetPeer *peer;
1837 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1840 peer = GNUNET_new (struct CadetPeer);
1841 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1843 peer_delete_oldest ();
1845 GNUNET_assert (GNUNET_OK ==
1846 GNUNET_CONTAINER_multipeermap_put (peers,
1849 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1850 peer->id = GNUNET_PEER_intern (peer_id);
1852 peer->last_contact = GNUNET_TIME_absolute_get ();
1859 * Retrieve the CadetPeer stucture associated with the peer. Optionally create
1860 * one and insert it in the appropriate structures if the peer is not known yet.
1862 * @param peer Short identity of the peer.
1863 * @param create #GNUNET_YES if a new peer should be created if unknown.
1864 * #GNUNET_NO otherwise.
1866 * @return Existing or newly created peer structure.
1867 * NULL if unknown and not requested @a create
1870 GCP_get_short (const GNUNET_PEER_Id peer, int create)
1872 return GCP_get (GNUNET_PEER_resolve2 (peer), create);
1877 * Try to connect to a peer on transport level.
1879 * @param cls Closure (peer).
1880 * @param tc TaskContext.
1883 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1885 struct CadetPeer *peer = cls;
1887 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1890 GNUNET_TRANSPORT_try_connect (transport_handle,
1891 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1896 * Try to establish a new connection to this peer (in its tunnel).
1897 * If the peer doesn't have any path to it yet, try to get one.
1898 * If the peer already has some path, send a CREATE CONNECTION towards it.
1900 * @param peer Peer to connect to.
1903 GCP_connect (struct CadetPeer *peer)
1905 struct CadetTunnel *t;
1906 struct CadetPeerPath *path;
1907 struct CadetConnection *c;
1910 GCC_check_connections ();
1911 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1913 /* If we have a current hello, try to connect using it. */
1914 GCP_try_connect (peer);
1918 rerun_search = GNUNET_NO;
1920 if (NULL != peer->path_head)
1922 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1923 path = peer_get_best_path (peer);
1929 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1932 c = GCT_use_path (t, path);
1935 /* This case can happen when the path includes a first hop that is
1936 * not yet known to be connected.
1938 * This happens quite often during testing when running cadet
1939 * under valgrind: core connect notifications come very late
1940 * and the DHT result has already come and created a valid
1941 * path. In this case, the peer->connections
1942 * hashmaps will be NULL and tunnel_use_path will not be able
1943 * to create a connection from that path.
1945 * Re-running the DHT GET should give core time to callback.
1947 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1948 * updating statistics about this issue.
1950 rerun_search = GNUNET_YES;
1954 GCC_send_create (c);
1960 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1964 if (GNUNET_YES == rerun_search)
1966 struct GNUNET_TIME_Relative delay;
1968 GCP_stop_search (peer);
1969 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1970 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay,
1973 GCC_check_connections ();
1977 if (GNUNET_NO == is_searching (peer))
1978 GCP_start_search (peer);
1979 GCC_check_connections ();
1984 * Chech whether there is a direct (core level) connection to peer.
1986 * @param peer Peer to check.
1988 * @return #GNUNET_YES if there is a direct connection.
1991 GCP_is_neighbor (const struct CadetPeer *peer)
1993 struct CadetPeerPath *path;
1995 if (NULL == peer->connections)
1998 for (path = peer->path_head; NULL != path; path = path->next)
2000 if (3 > path->length)
2004 /* Is not a neighbor but connections is not NULL, probably disconnecting */
2011 * Create and initialize a new tunnel towards a peer, in case it has none.
2012 * In case the peer already has a tunnel, nothing is done.
2014 * Does not generate any traffic, just creates the local data structures.
2016 * @param peer Peer towards which to create the tunnel.
2019 GCP_add_tunnel (struct CadetPeer *peer)
2021 GCC_check_connections ();
2022 if (NULL != peer->tunnel)
2024 peer->tunnel = GCT_new (peer);
2025 GCC_check_connections ();
2030 * Add a connection to a neighboring peer.
2032 * Store that the peer is the first hop of the connection in one
2033 * direction and that on peer disconnect the connection must be
2034 * notified and destroyed, for it will no longer be valid.
2036 * @param peer Peer to add connection to.
2037 * @param c Connection to add.
2038 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
2041 GCP_add_connection (struct CadetPeer *peer,
2042 struct CadetConnection *c,
2045 LOG (GNUNET_ERROR_TYPE_DEBUG,
2046 "adding connection %s\n",
2048 LOG (GNUNET_ERROR_TYPE_DEBUG,
2051 GNUNET_assert (NULL != peer->connections);
2052 GNUNET_assert (GNUNET_OK ==
2053 GNUNET_CONTAINER_multihashmap_put (peer->connections,
2056 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2057 LOG (GNUNET_ERROR_TYPE_DEBUG,
2058 "Peer %s has now %u connections.\n",
2060 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2065 * Add the path to the peer and update the path used to reach it in case this
2068 * @param peer Destination peer to add the path to.
2069 * @param path New path to add. Last peer must be the peer in arg 1.
2070 * Path will be either used of freed if already known.
2071 * @param trusted Do we trust that this path is real?
2073 * @return path if path was taken, pointer to existing duplicate if exists
2076 struct CadetPeerPath *
2077 GCP_add_path (struct CadetPeer *peer,
2078 struct CadetPeerPath *path,
2081 struct CadetPeerPath *aux;
2085 GCC_check_connections ();
2086 LOG (GNUNET_ERROR_TYPE_DEBUG,
2087 "adding path [%u] to peer %s\n",
2088 path->length, GCP_2s (peer));
2090 if (NULL == peer || NULL == path
2091 || path->peers[path->length - 1] != peer->id)
2094 path_destroy (path);
2098 for (l = 1; l < path->length; l++)
2100 if (path->peers[l] == myid)
2102 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2103 for (l2 = 0; l2 < path->length - l; l2++)
2105 path->peers[l2] = path->peers[l + l2];
2109 path->peers = GNUNET_realloc (path->peers,
2110 path->length * sizeof (GNUNET_PEER_Id));
2114 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2116 if (2 >= path->length && GNUNET_NO == trusted)
2118 /* Only allow CORE to tell us about direct paths */
2119 path_destroy (path);
2123 l = path_get_length (path);
2126 path_destroy (path);
2130 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2131 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2133 l2 = path_get_length (aux);
2136 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2137 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2138 peer->path_tail, aux, path);
2143 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2145 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2146 path_destroy (path);
2151 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2153 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2156 if (NULL != peer->tunnel
2157 && CONNECTIONS_PER_TUNNEL > GCT_count_connections (peer->tunnel)
2158 && 2 < path->length) /* Direct paths are handled by core_connect */
2162 GCC_check_connections ();
2168 * Add the path to the origin peer and update the path used to reach it in case
2169 * this is the shortest.
2170 * The path is given in peer_info -> destination, therefore we turn the path
2171 * upside down first.
2173 * @param peer Peer to add the path to, being the origin of the path.
2174 * @param path New path to add after being inversed.
2175 * Path will be either used or freed.
2176 * @param trusted Do we trust that this path is real?
2178 * @return path if path was taken, pointer to existing duplicate if exists
2181 struct CadetPeerPath *
2182 GCP_add_path_to_origin (struct CadetPeer *peer,
2183 struct CadetPeerPath *path,
2189 return GCP_add_path (peer, path, trusted);
2194 * Adds a path to the info of all the peers in the path
2196 * @param p Path to process.
2197 * @param confirmed Whether we know if the path works or not.
2200 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2204 /* TODO: invert and add */
2205 GCC_check_connections ();
2206 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2207 for (i++; i < p->length; i++)
2209 struct CadetPeer *aux;
2210 struct CadetPeerPath *copy;
2212 aux = GCP_get_short (p->peers[i], GNUNET_YES);
2213 copy = path_duplicate (p);
2214 copy->length = i + 1;
2215 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2217 GCC_check_connections ();
2222 * Remove any path to the peer that has the exact same peers as the one given.
2224 * @param peer Peer to remove the path from.
2225 * @param path Path to remove. Is always destroyed .
2228 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2230 struct CadetPeerPath *iter;
2231 struct CadetPeerPath *next;
2233 GCC_check_connections ();
2234 GNUNET_assert (myid == path->peers[0]);
2235 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2237 LOG (GNUNET_ERROR_TYPE_INFO, "Removing path %p (%u) from %s\n",
2238 path, path->length, GCP_2s (peer));
2240 for (iter = peer->path_head; NULL != iter; iter = next)
2243 if (0 == path_cmp (path, iter))
2245 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2247 path_destroy (iter);
2250 path_destroy (path);
2251 GCC_check_connections ();
2256 * Check that we are aware of a connection from a neighboring peer.
2258 * @param peer Peer to the connection is with
2259 * @param c Connection that should be in the map with this peer.
2262 GCP_check_connection (const struct CadetPeer *peer,
2263 const struct CadetConnection *c)
2265 GNUNET_assert (NULL != peer);
2266 GNUNET_assert (NULL != peer->connections);
2268 GNUNET_assert (GNUNET_YES ==
2269 GNUNET_CONTAINER_multihashmap_contains_value (peer->connections,
2276 * Remove a connection from a neighboring peer.
2278 * @param peer Peer to remove connection from.
2279 * @param c Connection to remove.
2282 GCP_remove_connection (struct CadetPeer *peer,
2283 const struct CadetConnection *c)
2285 LOG (GNUNET_ERROR_TYPE_DEBUG,
2286 "Removing connection %s\n",
2288 LOG (GNUNET_ERROR_TYPE_DEBUG,
2291 if ( (NULL == peer) ||
2292 (NULL == peer->connections) )
2294 GNUNET_assert (GNUNET_YES ==
2295 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2298 LOG (GNUNET_ERROR_TYPE_DEBUG,
2299 "Peer %s remains with %u connections.\n",
2301 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2306 * Start the DHT search for new paths towards the peer: we don't have
2307 * enough good connections.
2309 * @param peer Destination peer.
2312 GCP_start_search (struct CadetPeer *peer)
2314 const struct GNUNET_PeerIdentity *id;
2315 struct CadetTunnel *t = peer->tunnel;
2317 GCC_check_connections ();
2318 if (NULL != peer->search_h)
2324 if (NULL != peer->search_delayed)
2325 GCP_stop_search (peer);
2327 id = GNUNET_PEER_resolve2 (peer->id);
2328 peer->search_h = GCD_search (id, &search_handler, peer);
2332 /* Why would we search for a peer with no tunnel towards it? */
2337 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2338 || 0 == GCT_count_any_connections (t))
2340 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2342 GCC_check_connections ();
2347 * Stop the DHT search for new paths towards the peer: we already have
2348 * enough good connections.
2350 * @param peer Destination peer.
2353 GCP_stop_search (struct CadetPeer *peer)
2355 GCC_check_connections ();
2356 if (NULL != peer->search_h)
2358 GCD_search_stop (peer->search_h);
2359 peer->search_h = NULL;
2361 if (NULL != peer->search_delayed)
2363 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2364 peer->search_delayed = NULL;
2366 GCC_check_connections ();
2371 * Get the Full ID of a peer.
2373 * @param peer Peer to get from.
2375 * @return Full ID of peer.
2377 const struct GNUNET_PeerIdentity *
2378 GCP_get_id (const struct CadetPeer *peer)
2380 return GNUNET_PEER_resolve2 (peer->id);
2385 * Get the Short ID of a peer.
2387 * @param peer Peer to get from.
2389 * @return Short ID of peer.
2392 GCP_get_short_id (const struct CadetPeer *peer)
2401 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2407 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2410 if (NULL == t && GNUNET_YES == is_searching (peer))
2412 GCP_stop_search (peer);
2418 * Get the tunnel towards a peer.
2420 * @param peer Peer to get from.
2422 * @return Tunnel towards peer.
2424 struct CadetTunnel *
2425 GCP_get_tunnel (const struct CadetPeer *peer)
2429 return peer->tunnel;
2434 * Set the hello message.
2436 * @param peer Peer whose message to set.
2437 * @param hello Hello message.
2440 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2442 struct GNUNET_HELLO_Message *old;
2445 GCC_check_connections ();
2446 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2450 old = GCP_get_hello (peer);
2453 size = GNUNET_HELLO_size (hello);
2454 peer->hello = GNUNET_malloc (size);
2455 memcpy (peer->hello, hello, size);
2459 peer->hello = GNUNET_HELLO_merge (old, hello);
2462 GCC_check_connections ();
2467 * Get the hello message.
2469 * @param peer Peer whose message to get.
2471 * @return Hello message.
2473 struct GNUNET_HELLO_Message *
2474 GCP_get_hello (struct CadetPeer *peer)
2476 struct GNUNET_TIME_Absolute expiration;
2477 struct GNUNET_TIME_Relative remaining;
2479 if (NULL == peer->hello)
2482 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2483 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2484 if (0 == remaining.rel_value_us)
2486 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2487 GNUNET_STRINGS_absolute_time_to_string (expiration));
2488 GNUNET_free (peer->hello);
2496 * Try to connect to a peer on TRANSPORT level.
2498 * @param peer Peer to whom to connect.
2501 GCP_try_connect (struct CadetPeer *peer)
2503 struct GNUNET_HELLO_Message *hello;
2504 struct GNUNET_MessageHeader *mh;
2506 if (NULL == transport_handle)
2508 GCC_check_connections ();
2509 if (GNUNET_YES == GCP_is_neighbor (peer))
2511 hello = GCP_get_hello (peer);
2515 mh = GNUNET_HELLO_get_header (hello);
2516 GNUNET_TRANSPORT_offer_hello (transport_handle,
2520 GCC_check_connections ();
2525 * Notify a peer that a link between two other peers is broken. If any path
2526 * used that link, eliminate it.
2528 * @param peer Peer affected by the change.
2529 * @param peer1 Peer whose link is broken.
2530 * @param peer2 Peer whose link is broken.
2533 GCP_notify_broken_link (struct CadetPeer *peer,
2534 struct GNUNET_PeerIdentity *peer1,
2535 struct GNUNET_PeerIdentity *peer2)
2537 struct CadetPeerPath *iter;
2538 struct CadetPeerPath *next;
2543 GCC_check_connections ();
2544 p1 = GNUNET_PEER_search (peer1);
2545 p2 = GNUNET_PEER_search (peer2);
2547 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2548 if (0 == p1 || 0 == p2)
2550 /* We don't even know them */
2554 for (iter = peer->path_head; NULL != iter; iter = next)
2557 for (i = 0; i < iter->length - 1; i++)
2559 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2560 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2565 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2568 path_invalidate (iter);
2572 GCC_check_connections ();
2577 * Count the number of known paths toward the peer.
2579 * @param peer Peer to get path info.
2581 * @return Number of known paths.
2584 GCP_count_paths (const struct CadetPeer *peer)
2586 struct CadetPeerPath *iter;
2589 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2597 * Iterate over the paths to a peer.
2599 * @param peer Peer to get path info.
2600 * @param callback Function to call for every path.
2601 * @param cls Closure for @a callback.
2603 * @return Number of iterated paths.
2606 GCP_iterate_paths (struct CadetPeer *peer,
2607 GCP_path_iterator callback,
2610 struct CadetPeerPath *iter;
2613 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2616 if (GNUNET_YES != callback (cls, peer, iter))
2625 * Iterate all known peers.
2627 * @param iter Iterator.
2628 * @param cls Closure for @c iter.
2631 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2634 GCC_check_connections ();
2635 GNUNET_CONTAINER_multipeermap_iterate (peers,
2638 GCC_check_connections ();
2643 * Get the static string for a peer ID.
2647 * @return Static string for it's ID.
2650 GCP_2s (const struct CadetPeer *peer)
2654 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));
2658 /* end of gnunet-service-cadet_peer.c */