2 This file is part of GNUnet.
3 Copyright (C) 2013, 2015 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
21 * @file cadet/gnunet-service-cadet_peer.c
22 * @brief GNUnet CADET service connection handling
23 * @author Bartlomiej Polot
26 #include "gnunet_util_lib.h"
27 #include "gnunet_signatures.h"
28 #include "gnunet_transport_service.h"
29 #include "gnunet_core_service.h"
30 #include "gnunet_statistics_service.h"
31 #include "cadet_protocol.h"
32 #include "gnunet-service-cadet_peer.h"
33 #include "gnunet-service-cadet_dht.h"
34 #include "gnunet-service-cadet_connection.h"
35 #include "gnunet-service-cadet_tunnel.h"
36 #include "cadet_path.h"
38 #define LOG(level, ...) GNUNET_log_from (level,"cadet-p2p",__VA_ARGS__)
39 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-p2p",__VA_ARGS__)
42 /******************************************************************************/
43 /******************************** STRUCTS **********************************/
44 /******************************************************************************/
47 * Struct containing info about a queued transmission to this peer
54 struct CadetPeerQueue *next;
59 struct CadetPeerQueue *prev;
62 * Peer this transmission is directed to.
64 struct CadetPeer *peer;
67 * Connection this message belongs to.
69 struct CadetConnection *c;
77 * Pointer to info stucture used as cls.
89 uint16_t payload_type;
102 * Set when this message starts waiting for CORE.
104 struct GNUNET_TIME_Absolute start_waiting;
107 * Function to call on sending.
112 * Closure for callback.
119 * Struct containing all information regarding a given peer
129 * Last time we heard from this peer
131 struct GNUNET_TIME_Absolute last_contact;
134 * Paths to reach the peer, ordered by ascending hop count
136 struct CadetPeerPath *path_head;
139 * Paths to reach the peer, ordered by ascending hop count
141 struct CadetPeerPath *path_tail;
144 * Handle to stop the DHT search for paths to this peer
146 struct GCD_search_handle *search_h;
149 * Handle to stop the DHT search for paths to this peer
151 struct GNUNET_SCHEDULER_Task *search_delayed;
154 * Tunnel to this peer, if any.
156 struct CadetTunnel *tunnel;
159 * Connections that go through this peer; indexed by tid.
161 struct GNUNET_CONTAINER_MultiHashMap *connections;
164 * Handle for queued transmissions
166 struct GNUNET_CORE_TransmitHandle *core_transmit;
171 struct GNUNET_TIME_Absolute tmt_time;
174 * Transmission queue to core DLL head
176 struct CadetPeerQueue *queue_head;
179 * Transmission queue to core DLL tail
181 struct CadetPeerQueue *queue_tail;
184 * How many messages are in the queue to this peer.
186 unsigned int queue_n;
191 struct GNUNET_HELLO_Message* hello;
195 /******************************************************************************/
196 /******************************* GLOBALS ***********************************/
197 /******************************************************************************/
200 * Global handle to the statistics service.
202 extern struct GNUNET_STATISTICS_Handle *stats;
205 * Local peer own ID (full value).
207 extern struct GNUNET_PeerIdentity my_full_id;
210 * Local peer own ID (short)
212 extern GNUNET_PEER_Id myid;
215 * Peers known, indexed by PeerIdentity, values of type `struct CadetPeer`.
217 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
220 * How many peers do we want to remember?
222 static unsigned long long max_peers;
225 * Percentage of messages that will be dropped (for test purposes only).
227 static unsigned long long drop_percent;
230 * Handle to communicate with core.
232 static struct GNUNET_CORE_Handle *core_handle;
235 * Handle to try to start new connections.
237 static struct GNUNET_TRANSPORT_Handle *transport_handle;
240 /******************************************************************************/
241 /***************************** DEBUG *********************************/
242 /******************************************************************************/
245 * Log all kinds of info about the queueing status of a peer.
247 * @param p Peer whose queue to show.
248 * @param level Error level to use for logging.
251 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
253 struct CadetPeerQueue *q;
256 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
258 __FILE__, __FUNCTION__, __LINE__);
262 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
263 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
264 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
266 for (q = p->queue_head; NULL != q; q = q->next)
268 LOG2 (level, "QQQ - %s %s on %s\n",
269 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
270 LOG2 (level, "QQQ payload %s, %u\n",
271 GC_m2s (q->payload_type), q->payload_id);
272 LOG2 (level, "QQQ size: %u bytes\n", q->size);
275 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
280 * Log all kinds of info about a peer.
285 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
287 struct CadetPeerPath *path;
291 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
293 __FILE__, __FUNCTION__, __LINE__);
299 LOG2 (level, "PPP DEBUG PEER NULL\n");
303 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
304 LOG2 (level, "PPP last contact %s\n",
305 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
306 for (path = p->path_head; NULL != path; path = path->next)
311 LOG2 (level, "PPP path: %s\n", s);
315 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
316 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
318 if (NULL != p->connections)
319 conns += GNUNET_CONTAINER_multihashmap_size (p->connections);
320 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
321 queue_debug (p, level);
322 LOG2 (level, "PPP DEBUG END\n");
326 /******************************************************************************/
327 /***************************** CORE HELPERS *********************************/
328 /******************************************************************************/
332 * Iterator to notify all connections of a broken link. Mark connections
333 * to destroy after all traffic has been sent.
335 * @param cls Closure (peer disconnected).
336 * @param key Current key code (peer id).
337 * @param value Value in the hash map (connection).
339 * @return #GNUNET_YES to continue to iterate.
342 notify_broken (void *cls,
343 const struct GNUNET_HashCode *key,
346 struct CadetPeer *peer = cls;
347 struct CadetConnection *c = value;
349 LOG (GNUNET_ERROR_TYPE_DEBUG,
350 "Notifying %s due to %s\n",
353 GCC_notify_broken (c,
360 * Remove the direct path to the peer.
362 * @param peer Peer to remove the direct path from.
365 static struct CadetPeerPath *
366 pop_direct_path (struct CadetPeer *peer)
368 struct CadetPeerPath *iter;
370 for (iter = peer->path_head; NULL != iter; iter = iter->next)
372 if (2 >= iter->length)
374 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
382 /******************************************************************************/
383 /***************************** CORE CALLBACKS *********************************/
384 /******************************************************************************/
388 * Method called whenever a given peer connects.
391 * @param peer peer identity this notification is about
394 core_connect (void *cls,
395 const struct GNUNET_PeerIdentity *peer)
397 struct CadetPeer *mp;
398 struct CadetPeerPath *path;
401 GNUNET_snprintf (own_id,
404 GNUNET_i2s (&my_full_id));
408 LOG (GNUNET_ERROR_TYPE_INFO,
409 "CONNECTED %s (self)\n",
415 LOG (GNUNET_ERROR_TYPE_INFO,
416 "CONNECTED %s <= %s\n",
420 path->peers[1] = mp->id;
421 GNUNET_PEER_change_rc (mp->id, 1);
423 path->peers[0] = myid;
424 GNUNET_PEER_change_rc (myid, 1);
425 GCP_add_path (mp, path, GNUNET_YES);
426 GNUNET_STATISTICS_update (stats,
430 GNUNET_assert (NULL == mp->connections);
431 mp->connections = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_NO);
433 if ( (NULL != GCP_get_tunnel (mp)) &&
434 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
440 * Method called whenever a peer disconnects.
443 * @param peer peer identity this notification is about
446 core_disconnect (void *cls,
447 const struct GNUNET_PeerIdentity *peer)
450 struct CadetPeerPath *direct_path;
453 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
454 p = GNUNET_CONTAINER_multipeermap_get (peers,
462 LOG (GNUNET_ERROR_TYPE_INFO,
463 "DISCONNECTED %s (self)\n",
466 LOG (GNUNET_ERROR_TYPE_INFO,
467 "DISCONNECTED %s <= %s\n",
468 own_id, GNUNET_i2s (peer));
469 direct_path = pop_direct_path (p);
470 GNUNET_CONTAINER_multihashmap_iterate (p->connections,
473 GNUNET_CONTAINER_multihashmap_destroy (p->connections);
474 p->connections = NULL;
475 if (NULL != p->core_transmit)
477 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
478 p->core_transmit = NULL;
479 p->tmt_time.abs_value_us = 0;
481 GNUNET_STATISTICS_update (stats,
485 path_destroy (direct_path);
490 * Functions to handle messages from core
492 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
493 {&GCC_handle_create, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE, 0},
494 {&GCC_handle_confirm, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK,
495 sizeof (struct GNUNET_CADET_ConnectionACK)},
496 {&GCC_handle_broken, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN,
497 sizeof (struct GNUNET_CADET_ConnectionBroken)},
498 {&GCC_handle_destroy, GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY,
499 sizeof (struct GNUNET_CADET_ConnectionDestroy)},
500 {&GCC_handle_ack, GNUNET_MESSAGE_TYPE_CADET_ACK,
501 sizeof (struct GNUNET_CADET_ACK)},
502 {&GCC_handle_poll, GNUNET_MESSAGE_TYPE_CADET_POLL,
503 sizeof (struct GNUNET_CADET_Poll)},
504 {&GCC_handle_kx, GNUNET_MESSAGE_TYPE_CADET_KX, 0},
505 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED, 0},
506 {&GCC_handle_encrypted, GNUNET_MESSAGE_TYPE_CADET_AX, 0}
511 * To be called on core init/fail.
513 * @param cls Closure (config)
514 * @param identity the public identity of this peer
517 core_init (void *cls,
518 const struct GNUNET_PeerIdentity *identity)
520 const struct GNUNET_CONFIGURATION_Handle *c = cls;
523 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
524 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
526 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
527 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
528 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
529 GNUNET_CORE_disconnect (core_handle);
530 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
531 NULL, /* Closure passed to CADET functions */
532 &core_init, /* Call core_init once connected */
533 &core_connect, /* Handle connects */
534 &core_disconnect, /* remove peers on disconnects */
535 NULL, /* Don't notify about all incoming messages */
536 GNUNET_NO, /* For header only in notification */
537 NULL, /* Don't notify about all outbound messages */
538 GNUNET_NO, /* For header-only out notification */
539 core_handlers); /* Register these handlers */
548 * Core callback to write a pre-constructed data packet to core buffer
550 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
551 * @param size Number of bytes available in buf.
552 * @param buf Where the to write the message.
554 * @return number of bytes written to buf
557 send_core_data_raw (void *cls, size_t size, void *buf)
559 struct GNUNET_MessageHeader *msg = cls;
562 GNUNET_assert (NULL != msg);
563 total_size = ntohs (msg->size);
565 if (total_size > size)
570 memcpy (buf, msg, total_size);
577 * Function to send a create connection message to a peer.
579 * @param c Connection to create.
580 * @param size number of bytes available in buf
581 * @param buf where the callee should write the message
582 * @return number of bytes written to buf
585 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
587 struct GNUNET_CADET_ConnectionCreate *msg;
588 struct GNUNET_PeerIdentity *peer_ptr;
589 const struct CadetPeerPath *p = GCC_get_path (c);
596 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
598 sizeof (struct GNUNET_CADET_ConnectionCreate) +
599 p->length * sizeof (struct GNUNET_PeerIdentity);
601 if (size < size_needed || NULL == buf)
606 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
607 msg->header.size = htons (size_needed);
608 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
609 msg->cid = *GCC_get_id (c);
611 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
612 for (i = 0; i < p->length; i++)
614 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
617 LOG (GNUNET_ERROR_TYPE_DEBUG,
618 "CONNECTION CREATE (%u bytes long) sent!\n",
625 * Creates a path ack message in buf and frees all unused resources.
627 * @param c Connection to send an ACK on.
628 * @param size number of bytes available in buf
629 * @param buf where the callee should write the message
631 * @return number of bytes written to buf
634 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
636 struct GNUNET_CADET_ConnectionACK *msg = buf;
638 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
639 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
644 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
645 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
646 msg->cid = *GCC_get_id (c);
648 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
649 return sizeof (struct GNUNET_CADET_ConnectionACK);
653 /******************************************************************************/
654 /******************************** STATIC ***********************************/
655 /******************************************************************************/
659 * Get priority for a queued message.
661 * @param q Queued message
663 * @return CORE priority to use.
665 static enum GNUNET_CORE_Priority
666 get_priority (struct CadetPeerQueue *q)
668 enum GNUNET_CORE_Priority low;
669 enum GNUNET_CORE_Priority high;
674 return GNUNET_CORE_PRIO_BACKGROUND;
677 /* Relayed traffic has lower priority, our own traffic has higher */
678 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
680 low = GNUNET_CORE_PRIO_BEST_EFFORT;
681 high = GNUNET_CORE_PRIO_URGENT;
685 low = GNUNET_CORE_PRIO_URGENT;
686 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
689 /* Bulky payload has lower priority, control traffic has higher. */
690 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
691 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
699 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
702 * @param key current key code
703 * @param value value in the hash map
704 * @return #GNUNET_YES if we should continue to iterate,
708 shutdown_tunnel (void *cls,
709 const struct GNUNET_PeerIdentity *key,
712 struct CadetPeer *p = value;
713 struct CadetTunnel *t = p->tunnel;
723 * Check if peer is searching for a path (either active or delayed search).
725 * @param peer Peer to check
726 * @return #GNUNET_YES if there is a search active.
727 * #GNUNET_NO otherwise.
730 is_searching (const struct CadetPeer *peer)
732 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
733 GNUNET_NO : GNUNET_YES;
738 * @brief Start a search for a peer.
740 * @param cls Closure (Peer to search for).
741 * @param tc Task context.
744 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
746 struct CadetPeer *peer = cls;
748 peer->search_delayed = NULL;
750 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
753 GCP_start_search (peer);
758 * Destroy the peer_info and free any allocated resources linked to it
760 * @param peer The peer_info to destroy.
761 * @return #GNUNET_OK on success
764 peer_destroy (struct CadetPeer *peer)
766 struct GNUNET_PeerIdentity id;
767 struct CadetPeerPath *p;
768 struct CadetPeerPath *nextp;
770 GNUNET_PEER_resolve (peer->id, &id);
771 GNUNET_PEER_change_rc (peer->id, -1);
773 LOG (GNUNET_ERROR_TYPE_WARNING,
774 "destroying peer %s\n",
778 GNUNET_CONTAINER_multipeermap_remove (peers,
783 LOG (GNUNET_ERROR_TYPE_WARNING, " not in peermap!!\n");
785 GCP_stop_search (peer);
790 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
794 GCT_destroy_empty (peer->tunnel);
801 * Returns if peer is used (has a tunnel or is neighbor).
803 * @param peer Peer to check.
804 * @return #GNUNET_YES if peer is in use.
807 peer_is_used (struct CadetPeer *peer)
809 struct CadetPeerPath *p;
811 if (NULL != peer->tunnel)
814 for (p = peer->path_head; NULL != p; p = p->next)
824 * Iterator over all the peers to get the oldest timestamp.
826 * @param cls Closure (unsued).
827 * @param key ID of the peer.
828 * @param value Peer_Info of the peer.
831 peer_get_oldest (void *cls,
832 const struct GNUNET_PeerIdentity *key,
835 struct CadetPeer *p = value;
836 struct GNUNET_TIME_Absolute *abs = cls;
838 /* Don't count active peers */
839 if (GNUNET_YES == peer_is_used (p))
842 if (abs->abs_value_us < p->last_contact.abs_value_us)
843 abs->abs_value_us = p->last_contact.abs_value_us;
850 * Iterator over all the peers to remove the oldest entry.
852 * @param cls Closure (unsued).
853 * @param key ID of the peer.
854 * @param value Peer_Info of the peer.
857 peer_timeout (void *cls,
858 const struct GNUNET_PeerIdentity *key,
861 struct CadetPeer *p = value;
862 struct GNUNET_TIME_Absolute *abs = cls;
864 LOG (GNUNET_ERROR_TYPE_WARNING,
865 "peer %s timeout\n", GNUNET_i2s (key));
867 if (p->last_contact.abs_value_us == abs->abs_value_us &&
868 GNUNET_NO == peer_is_used (p))
878 * Delete oldest unused peer.
881 peer_delete_oldest (void)
883 struct GNUNET_TIME_Absolute abs;
885 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
887 GNUNET_CONTAINER_multipeermap_iterate (peers,
890 GNUNET_CONTAINER_multipeermap_iterate (peers,
897 * Choose the best (yet unused) path towards a peer,
898 * considering the tunnel properties.
900 * @param peer The destination peer.
901 * @return Best current known path towards the peer, if any.
903 static struct CadetPeerPath *
904 peer_get_best_path (const struct CadetPeer *peer)
906 struct CadetPeerPath *best_p;
907 struct CadetPeerPath *p;
908 unsigned int best_cost;
911 best_cost = UINT_MAX;
913 for (p = peer->path_head; NULL != p; p = p->next)
915 if (GNUNET_NO == path_is_valid (p))
916 continue; /* Don't use invalid paths. */
917 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
918 continue; /* If path is already in use, skip it. */
920 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
931 * Is this queue element sendable?
933 * - All management traffic is always sendable.
934 * - For payload traffic, check the connection flow control.
936 * @param q Queue element to inspect.
937 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
940 queue_is_sendable (struct CadetPeerQueue *q)
942 /* Is PID-independent? */
945 case GNUNET_MESSAGE_TYPE_CADET_ACK:
946 case GNUNET_MESSAGE_TYPE_CADET_POLL:
947 case GNUNET_MESSAGE_TYPE_CADET_KX:
948 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
949 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
950 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
951 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
954 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
955 case GNUNET_MESSAGE_TYPE_CADET_AX:
962 return GCC_is_sendable (q->c, q->fwd);
967 * Get first sendable message.
969 * @param peer The destination peer.
971 * @return First transmittable message, if any. Otherwise, NULL.
973 static struct CadetPeerQueue *
974 peer_get_first_message (const struct CadetPeer *peer)
976 struct CadetPeerQueue *q;
978 for (q = peer->queue_head; NULL != q; q = q->next)
980 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
981 if (queue_is_sendable (q))
990 * Function to process paths received for a new peer addition. The recorded
991 * paths form the initial tunnel, which can be optimized later.
992 * Called on each result obtained for the DHT search.
998 search_handler (void *cls, const struct CadetPeerPath *path)
1000 struct CadetPeer *peer = cls;
1001 unsigned int connection_count;
1003 GCP_add_path_to_all (path, GNUNET_NO);
1005 /* Count connections */
1006 connection_count = GCT_count_connections (peer->tunnel);
1008 /* If we already have our minimum (or more) connections, it's enough */
1009 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1012 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1014 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1021 * Adjust core requested size to accomodate an ACK.
1023 * @param message_size Requested size.
1025 * @return Size enough to fit @c message_size and an ACK.
1028 get_core_size (size_t message_size)
1030 return message_size + sizeof (struct GNUNET_CADET_ACK);
1035 * Fill a core buffer with the appropriate data for the queued message.
1037 * @param queue Queue element for the message.
1038 * @param buf Core buffer to fill.
1039 * @param size Size remaining in @c buf.
1040 * @param[out] pid In case its an encrypted payload, set payload.
1042 * @return Bytes written to @c buf.
1045 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1047 struct CadetConnection *c = queue->c;
1050 switch (queue->type)
1052 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1053 *pid = GCC_get_pid (queue->c, queue->fwd);
1054 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1055 msg_size = send_core_data_raw (queue->cls, size, buf);
1056 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1058 case GNUNET_MESSAGE_TYPE_CADET_AX:
1059 *pid = GCC_get_pid (queue->c, queue->fwd);
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1061 msg_size = send_core_data_raw (queue->cls, size, buf);
1062 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1064 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1065 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1066 case GNUNET_MESSAGE_TYPE_CADET_KX:
1067 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1068 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1069 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1070 msg_size = send_core_data_raw (queue->cls, size, buf);
1072 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1073 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1074 if (GCC_is_origin (c, GNUNET_YES))
1075 msg_size = send_core_connection_create (c, size, buf);
1077 msg_size = send_core_data_raw (queue->cls, size, buf);
1079 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1080 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1081 if (GCC_is_origin (c, GNUNET_NO) ||
1082 GCC_is_origin (c, GNUNET_YES))
1084 msg_size = send_core_connection_ack (c, size, buf);
1088 msg_size = send_core_data_raw (queue->cls, size, buf);
1091 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1092 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1093 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1094 /* This should be encapsulted */
1100 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1104 GNUNET_assert (size >= msg_size);
1111 * Core callback to write a queued packet to core buffer
1113 * @param cls Closure (peer info).
1114 * @param size Number of bytes available in buf.
1115 * @param buf Where the to write the message.
1117 * @return number of bytes written to buf
1120 queue_send (void *cls, size_t size, void *buf)
1122 struct CadetPeer *peer = cls;
1123 struct CadetConnection *c;
1124 struct CadetPeerQueue *queue;
1125 struct GNUNET_TIME_Relative core_wait_time;
1126 const struct GNUNET_PeerIdentity *dst_id;
1133 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1134 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1135 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1136 GCP_2s (peer), size);
1138 /* Sanity checking */
1139 if (NULL == buf || 0 == size)
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1142 peer->tmt_time.abs_value_us = 0;
1143 peer->core_transmit = NULL;
1152 peer->core_transmit = NULL;
1153 queue = peer_get_first_message (peer);
1156 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1157 peer->tmt_time.abs_value_us = 0;
1160 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1161 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1162 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1163 peer->tmt_time.abs_value_us = 0;
1165 /* Copy all possible messages to the core buffer */
1166 while (NULL != queue && rest >= queue->size)
1170 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1171 GCC_2s (c), GC_f2s(queue->fwd));
1172 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1173 queue->size, total_size, size);
1175 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1177 if (0 < drop_percent &&
1178 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1180 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1181 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1182 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1187 LOG (GNUNET_ERROR_TYPE_INFO,
1188 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1189 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1190 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1192 total_size += msg_size;
1194 dst = &dst[msg_size];
1197 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1198 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1201 queue = peer_get_first_message (peer);
1204 /* If more data in queue, send next */
1207 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1208 if (NULL == peer->core_transmit)
1210 dst_id = GNUNET_PEER_resolve2 (peer->id);
1211 peer->core_transmit =
1212 GNUNET_CORE_notify_transmit_ready (core_handle,
1213 GNUNET_NO, get_priority (queue),
1214 GNUNET_TIME_UNIT_FOREVER_REL,
1216 get_core_size (queue->size),
1219 peer->tmt_time = GNUNET_TIME_absolute_get ();
1220 queue->start_waiting = GNUNET_TIME_absolute_get ();
1224 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1226 // GCC_start_poll (); FIXME needed?
1230 // GCC_stop_poll(); FIXME needed?
1233 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1234 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1240 /******************************************************************************/
1241 /******************************** API ***********************************/
1242 /******************************************************************************/
1246 * Free a transmission that was already queued with all resources
1247 * associated to the request.
1249 * If connection was marked to be destroyed, and this was the last queued
1250 * message on it, the connection will be free'd as a result.
1252 * @param queue Queue handler to cancel.
1253 * @param clear_cls Is it necessary to free associated cls?
1254 * @param sent Was it really sent? (Could have been canceled)
1255 * @param pid PID, if relevant (was sent and was a payload message).
1257 * @return #GNUNET_YES if connection was destroyed as a result,
1258 * #GNUNET_NO otherwise.
1261 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1262 int sent, uint32_t pid)
1264 struct CadetPeer *peer;
1265 int connection_destroyed;
1268 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1269 if (GNUNET_YES == clear_cls)
1271 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1272 switch (queue->type)
1274 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1275 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1277 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1278 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1279 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1280 case GNUNET_MESSAGE_TYPE_CADET_KX:
1281 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1282 case GNUNET_MESSAGE_TYPE_CADET_AX:
1283 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1284 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1285 GNUNET_free_non_null (queue->cls);
1290 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1291 GC_m2s (queue->type));
1294 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1296 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1297 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1302 if (NULL != queue->cont)
1304 struct GNUNET_TIME_Relative wait_time;
1306 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1307 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1308 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1309 connection_destroyed = queue->cont (queue->cont_cls,
1310 queue->c, sent, queue->type, pid,
1311 queue->fwd, queue->size, wait_time);
1315 connection_destroyed = GNUNET_NO;
1318 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1320 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1321 peer->core_transmit = NULL;
1322 peer->tmt_time.abs_value_us = 0;
1325 GNUNET_free (queue);
1326 return connection_destroyed;
1331 * @brief Queue and pass message to core when possible.
1333 * @param peer Peer towards which to queue the message.
1334 * @param cls Closure (@c type dependant). It will be used by queue_send to
1335 * build the message to be sent if not already prebuilt.
1336 * @param type Type of the message, 0 for a raw message.
1337 * @param size Size of the message.
1338 * @param c Connection this message belongs to (can be NULL).
1339 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1340 * @param cont Continuation to be called once CORE has taken the message.
1341 * @param cont_cls Closure for @c cont.
1343 * @return Handle to cancel the message before it is sent. Once cont is called
1344 * message has been sent and therefore the handle is no longer valid.
1346 struct CadetPeerQueue *
1347 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1348 uint16_t payload_type, uint32_t payload_id, size_t size,
1349 struct CadetConnection *c, int fwd,
1350 GCP_sent cont, void *cont_cls)
1352 struct CadetPeerQueue *q;
1357 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1358 error_level = GNUNET_ERROR_TYPE_ERROR;
1360 error_level = GNUNET_ERROR_TYPE_INFO;
1362 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1363 GC_m2s (type), GC_m2s (payload_type), payload_id,
1364 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1366 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1368 if (NULL == peer->connections)
1370 /* We are not connected to this peer, ignore request. */
1371 LOG (GNUNET_ERROR_TYPE_INFO, "%s not a neighbor\n", GCP_2s (peer));
1372 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1379 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1380 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1385 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1387 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1388 GNUNET_YES : GCC_is_sendable (c, fwd);
1389 q = GNUNET_new (struct CadetPeerQueue);
1392 q->payload_type = payload_type;
1393 q->payload_id = payload_id;
1399 q->cont_cls = cont_cls;
1402 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1407 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1408 call_core = GNUNET_YES;
1411 q->start_waiting = GNUNET_TIME_absolute_get ();
1412 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1414 LOG (GNUNET_ERROR_TYPE_DEBUG,
1415 "calling core tmt rdy towards %s for %u bytes\n",
1416 GCP_2s (peer), size);
1417 peer->core_transmit =
1418 GNUNET_CORE_notify_transmit_ready (core_handle,
1419 GNUNET_NO, get_priority (q),
1420 GNUNET_TIME_UNIT_FOREVER_REL,
1421 GNUNET_PEER_resolve2 (peer->id),
1422 get_core_size (size),
1424 peer->tmt_time = GNUNET_TIME_absolute_get ();
1426 else if (GNUNET_NO == call_core)
1428 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1434 struct GNUNET_TIME_Relative elapsed;
1435 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1436 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1438 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1441 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1447 * Cancel all queued messages to a peer that belong to a certain connection.
1449 * @param peer Peer towards whom to cancel.
1450 * @param c Connection whose queued messages to cancel. Might be destroyed by
1451 * the sent continuation call.
1454 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1456 struct CadetPeerQueue *q;
1457 struct CadetPeerQueue *next;
1458 struct CadetPeerQueue *prev;
1459 int connection_destroyed;
1461 connection_destroyed = GNUNET_NO;
1462 for (q = peer->queue_head; NULL != q; q = next)
1467 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1468 GNUNET_break (GNUNET_NO == connection_destroyed);
1469 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1475 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1478 /* Get next from prev, q->next might be already freed:
1479 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1482 next = peer->queue_head;
1492 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1494 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1495 peer->core_transmit = NULL;
1496 peer->tmt_time.abs_value_us = 0;
1502 * Get the first transmittable message for a connection.
1504 * @param peer Neighboring peer.
1505 * @param c Connection.
1507 * @return First transmittable message.
1509 static struct CadetPeerQueue *
1510 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1512 struct CadetPeerQueue *q;
1514 for (q = peer->queue_head; NULL != q; q = q->next)
1518 if (queue_is_sendable (q))
1520 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1523 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1531 * Get the first message for a connection and unqueue it.
1533 * Only tunnel (or higher) level messages are unqueued. Connection specific
1534 * messages are silently destroyed upon encounter.
1536 * @param peer Neighboring peer.
1537 * @param c Connection.
1538 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1541 * @return First message for this connection.
1543 struct GNUNET_MessageHeader *
1544 GCP_connection_pop (struct CadetPeer *peer,
1545 struct CadetConnection *c,
1548 struct CadetPeerQueue *q;
1549 struct CadetPeerQueue *next;
1550 struct GNUNET_MessageHeader *msg;
1553 GNUNET_assert (NULL != destroyed);
1554 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1555 for (q = peer->queue_head; NULL != q; q = next)
1560 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1561 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1565 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1566 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1567 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1568 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1569 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1570 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1571 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1572 if (GNUNET_YES == dest)
1574 GNUNET_break (GNUNET_NO == *destroyed);
1575 *destroyed = GNUNET_YES;
1579 case GNUNET_MESSAGE_TYPE_CADET_KX:
1580 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1581 case GNUNET_MESSAGE_TYPE_CADET_AX:
1582 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1583 msg = (struct GNUNET_MessageHeader *) q->cls;
1584 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1585 if (GNUNET_YES == dest)
1587 GNUNET_break (GNUNET_NO == *destroyed);
1588 *destroyed = GNUNET_YES;
1594 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1602 * Unlock a possibly locked queue for a connection.
1604 * If there is a message that can be sent on this connection, call core for it.
1605 * Otherwise (if core transmit is already called or there is no sendable
1606 * message) do nothing.
1608 * @param peer Peer who keeps the queue.
1609 * @param c Connection whose messages to unlock.
1612 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1614 struct CadetPeerQueue *q;
1617 if (NULL != peer->core_transmit)
1619 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1620 return; /* Already unlocked */
1623 q = connection_get_first_message (peer, c);
1626 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1627 return; /* Nothing to transmit */
1631 peer->core_transmit =
1632 GNUNET_CORE_notify_transmit_ready (core_handle,
1633 GNUNET_NO, get_priority (q),
1634 GNUNET_TIME_UNIT_FOREVER_REL,
1635 GNUNET_PEER_resolve2 (peer->id),
1636 get_core_size (size),
1639 peer->tmt_time = GNUNET_TIME_absolute_get ();
1644 * Initialize the peer subsystem.
1646 * @param c Configuration.
1649 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1651 LOG (GNUNET_ERROR_TYPE_DEBUG,
1653 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1655 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1658 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1659 "CADET", "MAX_PEERS", "USING DEFAULT");
1664 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1671 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1672 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1673 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1674 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1675 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1678 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1679 NULL, /* Closure passed to CADET functions */
1680 &core_init, /* Call core_init once connected */
1681 &core_connect, /* Handle connects */
1682 &core_disconnect, /* remove peers on disconnects */
1683 NULL, /* Don't notify about all incoming messages */
1684 GNUNET_NO, /* For header only in notification */
1685 NULL, /* Don't notify about all outbound messages */
1686 GNUNET_NO, /* For header-only out notification */
1687 core_handlers); /* Register these handlers */
1689 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1691 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1692 /* Notify callbacks */
1697 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1698 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1699 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1700 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1701 transport_handle = NULL;
1706 if (NULL == core_handle)
1709 GNUNET_SCHEDULER_shutdown ();
1717 * Shut down the peer subsystem.
1722 GNUNET_CONTAINER_multipeermap_iterate (peers,
1725 if (NULL != core_handle)
1727 GNUNET_CORE_disconnect (core_handle);
1730 if (NULL != transport_handle)
1732 GNUNET_TRANSPORT_disconnect (transport_handle);
1733 transport_handle = NULL;
1735 GNUNET_PEER_change_rc (myid, -1);
1736 GNUNET_CONTAINER_multipeermap_destroy (peers);
1742 * Retrieve the CadetPeer stucture associated with the peer, create one
1743 * and insert it in the appropriate structures if the peer is not known yet.
1745 * @param peer_id Full identity of the peer.
1747 * @return Existing or newly created peer structure.
1750 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1752 struct CadetPeer *peer;
1754 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1757 peer = GNUNET_new (struct CadetPeer);
1758 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1760 peer_delete_oldest ();
1762 GNUNET_assert (GNUNET_OK ==
1763 GNUNET_CONTAINER_multipeermap_put (peers,
1766 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1767 peer->id = GNUNET_PEER_intern (peer_id);
1769 peer->last_contact = GNUNET_TIME_absolute_get ();
1776 * Retrieve the CadetPeer stucture associated with the peer, create one
1777 * and insert it in the appropriate structures if the peer is not known yet.
1779 * @param peer Short identity of the peer.
1781 * @return Existing or newly created peer structure.
1784 GCP_get_short (const GNUNET_PEER_Id peer)
1786 return GCP_get (GNUNET_PEER_resolve2 (peer));
1791 * Try to connect to a peer on transport level.
1793 * @param cls Closure (peer).
1794 * @param tc TaskContext.
1797 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1799 struct CadetPeer *peer = cls;
1801 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1804 GNUNET_TRANSPORT_try_connect (transport_handle,
1805 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1810 * Try to establish a new connection to this peer (in its tunnel).
1811 * If the peer doesn't have any path to it yet, try to get one.
1812 * If the peer already has some path, send a CREATE CONNECTION towards it.
1814 * @param peer Peer to connect to.
1817 GCP_connect (struct CadetPeer *peer)
1819 struct CadetTunnel *t;
1820 struct CadetPeerPath *p;
1821 struct CadetConnection *c;
1824 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1826 /* If we have a current hello, try to connect using it. */
1827 GCP_try_connect (peer);
1831 rerun_search = GNUNET_NO;
1833 if (NULL != peer->path_head)
1835 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1836 p = peer_get_best_path (peer);
1842 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1845 c = GCT_use_path (t, p);
1848 /* This case can happen when the path includes a first hop that is
1849 * not yet known to be connected.
1851 * This happens quite often during testing when running cadet
1852 * under valgrind: core connect notifications come very late
1853 * and the DHT result has already come and created a valid
1854 * path. In this case, the peer->connections_{pred,succ}
1855 * hashmaps will be NULL and tunnel_use_path will not be able
1856 * to create a connection from that path.
1858 * Re-running the DHT GET should give core time to callback.
1860 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1861 * updating statistics about this issue.
1863 rerun_search = GNUNET_YES;
1867 GCC_send_create (c);
1873 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1877 if (GNUNET_YES == rerun_search)
1879 struct GNUNET_TIME_Relative delay;
1881 GCP_stop_search (peer);
1882 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1883 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1888 if (GNUNET_NO == is_searching (peer))
1889 GCP_start_search (peer);
1894 * Chech whether there is a direct (core level) connection to peer.
1896 * @param peer Peer to check.
1898 * @return #GNUNET_YES if there is a direct connection.
1901 GCP_is_neighbor (const struct CadetPeer *peer)
1903 struct CadetPeerPath *path;
1905 if (NULL == peer->connections)
1908 for (path = peer->path_head; NULL != path; path = path->next)
1910 if (3 > path->length)
1914 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1920 * Create and initialize a new tunnel towards a peer, in case it has none.
1921 * In case the peer already has a tunnel, nothing is done.
1923 * Does not generate any traffic, just creates the local data structures.
1925 * @param peer Peer towards which to create the tunnel.
1928 GCP_add_tunnel (struct CadetPeer *peer)
1930 if (NULL != peer->tunnel)
1932 peer->tunnel = GCT_new (peer);
1937 * Add a connection to a neighboring peer.
1939 * Store that the peer is the first hop of the connection in one
1940 * direction and that on peer disconnect the connection must be
1941 * notified and destroyed, for it will no longer be valid.
1943 * @param peer Peer to add connection to.
1944 * @param c Connection to add.
1945 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1948 GCP_add_connection (struct CadetPeer *peer,
1949 struct CadetConnection *c,
1952 LOG (GNUNET_ERROR_TYPE_DEBUG,
1953 "adding connection %s\n",
1955 LOG (GNUNET_ERROR_TYPE_DEBUG,
1958 GNUNET_assert (NULL != peer->connections);
1959 GNUNET_assert (GNUNET_OK ==
1960 GNUNET_CONTAINER_multihashmap_put (peer->connections,
1963 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1964 LOG (GNUNET_ERROR_TYPE_DEBUG,
1965 "Peer %s has now %u connections.\n",
1967 GNUNET_CONTAINER_multihashmap_size (peer->connections));
1972 * Add the path to the peer and update the path used to reach it in case this
1975 * @param peer Destination peer to add the path to.
1976 * @param path New path to add. Last peer must be the peer in arg 1.
1977 * Path will be either used of freed if already known.
1978 * @param trusted Do we trust that this path is real?
1980 * @return path if path was taken, pointer to existing duplicate if exists
1983 struct CadetPeerPath *
1984 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
1987 struct CadetPeerPath *aux;
1991 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
1992 path->length, GCP_2s (peer));
1994 if (NULL == peer || NULL == path
1995 || path->peers[path->length - 1] != peer->id)
1998 path_destroy (path);
2002 for (l = 1; l < path->length; l++)
2004 if (path->peers[l] == myid)
2006 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2007 for (l2 = 0; l2 < path->length - l; l2++)
2009 path->peers[l2] = path->peers[l + l2];
2013 path->peers = GNUNET_realloc (path->peers,
2014 path->length * sizeof (GNUNET_PEER_Id));
2018 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2020 if (2 >= path->length && GNUNET_NO == trusted)
2022 /* Only allow CORE to tell us about direct paths */
2023 path_destroy (path);
2027 l = path_get_length (path);
2030 path_destroy (path);
2034 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2035 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2037 l2 = path_get_length (aux);
2040 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2041 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2042 peer->path_tail, aux, path);
2047 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2049 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2050 path_destroy (path);
2055 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2057 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2060 if (NULL != peer->tunnel
2061 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2070 * Add the path to the origin peer and update the path used to reach it in case
2071 * this is the shortest.
2072 * The path is given in peer_info -> destination, therefore we turn the path
2073 * upside down first.
2075 * @param peer Peer to add the path to, being the origin of the path.
2076 * @param path New path to add after being inversed.
2077 * Path will be either used or freed.
2078 * @param trusted Do we trust that this path is real?
2080 * @return path if path was taken, pointer to existing duplicate if exists
2083 struct CadetPeerPath *
2084 GCP_add_path_to_origin (struct CadetPeer *peer,
2085 struct CadetPeerPath *path,
2091 return GCP_add_path (peer, path, trusted);
2096 * Adds a path to the info of all the peers in the path
2098 * @param p Path to process.
2099 * @param confirmed Whether we know if the path works or not.
2102 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2106 /* TODO: invert and add */
2107 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2108 for (i++; i < p->length; i++)
2110 struct CadetPeer *aux;
2111 struct CadetPeerPath *copy;
2113 aux = GCP_get_short (p->peers[i]);
2114 copy = path_duplicate (p);
2115 copy->length = i + 1;
2116 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2122 * Remove any path to the peer that has the extact same peers as the one given.
2124 * @param peer Peer to remove the path from.
2125 * @param path Path to remove. Is always destroyed .
2128 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2130 struct CadetPeerPath *iter;
2131 struct CadetPeerPath *next;
2133 GNUNET_assert (myid == path->peers[0]);
2134 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2136 LOG (GNUNET_ERROR_TYPE_INFO,
2137 "Removing path %p (%u) from %s\n",
2142 for (iter = peer->path_head; NULL != iter; iter = next)
2145 if (0 == path_cmp (path, iter))
2147 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2149 path_destroy (iter);
2152 path_destroy (path);
2157 * Remove a connection from a neighboring peer.
2159 * @param peer Peer to remove connection from.
2160 * @param c Connection to remove.
2163 GCP_remove_connection (struct CadetPeer *peer,
2164 const struct CadetConnection *c)
2166 LOG (GNUNET_ERROR_TYPE_DEBUG,
2167 "Removing connection %s\n",
2169 LOG (GNUNET_ERROR_TYPE_DEBUG,
2172 if ( (NULL == peer) ||
2173 (NULL == peer->connections) )
2175 GNUNET_assert (GNUNET_YES ==
2176 GNUNET_CONTAINER_multihashmap_remove (peer->connections,
2179 LOG (GNUNET_ERROR_TYPE_DEBUG,
2180 "Peer %s reamins with %u connections.\n",
2182 GNUNET_CONTAINER_multihashmap_size (peer->connections));
2187 * Start the DHT search for new paths towards the peer: we don't have
2188 * enough good connections.
2190 * @param peer Destination peer.
2193 GCP_start_search (struct CadetPeer *peer)
2195 const struct GNUNET_PeerIdentity *id;
2196 struct CadetTunnel *t = peer->tunnel;
2198 if (NULL != peer->search_h)
2204 if (NULL != peer->search_delayed)
2205 GCP_stop_search (peer);
2207 id = GNUNET_PEER_resolve2 (peer->id);
2208 peer->search_h = GCD_search (id, &search_handler, peer);
2212 /* Why would we search for a peer with no tunnel towards it? */
2217 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2218 || 0 == GCT_count_any_connections (t))
2220 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2226 * Stop the DHT search for new paths towards the peer: we already have
2227 * enough good connections.
2229 * @param peer Destination peer.
2232 GCP_stop_search (struct CadetPeer *peer)
2234 if (NULL != peer->search_h)
2236 GCD_search_stop (peer->search_h);
2237 peer->search_h = NULL;
2239 if (NULL != peer->search_delayed)
2241 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2242 peer->search_delayed = NULL;
2248 * Get the Full ID of a peer.
2250 * @param peer Peer to get from.
2252 * @return Full ID of peer.
2254 const struct GNUNET_PeerIdentity *
2255 GCP_get_id (const struct CadetPeer *peer)
2257 return GNUNET_PEER_resolve2 (peer->id);
2262 * Get the Short ID of a peer.
2264 * @param peer Peer to get from.
2266 * @return Short ID of peer.
2269 GCP_get_short_id (const struct CadetPeer *peer)
2278 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2284 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2287 if (NULL == t && GNUNET_YES == is_searching (peer))
2289 GCP_stop_search (peer);
2295 * Get the tunnel towards a peer.
2297 * @param peer Peer to get from.
2299 * @return Tunnel towards peer.
2301 struct CadetTunnel *
2302 GCP_get_tunnel (const struct CadetPeer *peer)
2304 return peer->tunnel;
2309 * Set the hello message.
2311 * @param peer Peer whose message to set.
2312 * @param hello Hello message.
2315 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2317 struct GNUNET_HELLO_Message *old;
2320 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2324 old = GCP_get_hello (peer);
2327 size = GNUNET_HELLO_size (hello);
2328 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2329 peer->hello = GNUNET_malloc (size);
2330 memcpy (peer->hello, hello, size);
2334 peer->hello = GNUNET_HELLO_merge (old, hello);
2335 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2336 peer->hello, GNUNET_HELLO_size (hello));
2343 * Get the hello message.
2345 * @param peer Peer whose message to get.
2347 * @return Hello message.
2349 struct GNUNET_HELLO_Message *
2350 GCP_get_hello (struct CadetPeer *peer)
2352 struct GNUNET_TIME_Absolute expiration;
2353 struct GNUNET_TIME_Relative remaining;
2355 if (NULL == peer->hello)
2358 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2359 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2360 if (0 == remaining.rel_value_us)
2362 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2363 GNUNET_STRINGS_absolute_time_to_string (expiration));
2364 GNUNET_free (peer->hello);
2372 * Try to connect to a peer on TRANSPORT level.
2374 * @param peer Peer to whom to connect.
2377 GCP_try_connect (struct CadetPeer *peer)
2379 struct GNUNET_HELLO_Message *hello;
2380 struct GNUNET_MessageHeader *mh;
2382 if (NULL == transport_handle)
2385 hello = GCP_get_hello (peer);
2389 mh = GNUNET_HELLO_get_header (hello);
2390 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2395 * Notify a peer that a link between two other peers is broken. If any path
2396 * used that link, eliminate it.
2398 * @param peer Peer affected by the change.
2399 * @param peer1 Peer whose link is broken.
2400 * @param peer2 Peer whose link is broken.
2403 GCP_notify_broken_link (struct CadetPeer *peer,
2404 struct GNUNET_PeerIdentity *peer1,
2405 struct GNUNET_PeerIdentity *peer2)
2407 struct CadetPeerPath *iter;
2408 struct CadetPeerPath *next;
2413 p1 = GNUNET_PEER_search (peer1);
2414 p2 = GNUNET_PEER_search (peer2);
2416 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2417 if (0 == p1 || 0 == p2)
2419 /* We don't even know them */
2423 for (iter = peer->path_head; NULL != iter; iter = next)
2426 for (i = 0; i < iter->length - 1; i++)
2428 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2429 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2434 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2437 path_invalidate (iter);
2445 * Count the number of known paths toward the peer.
2447 * @param peer Peer to get path info.
2449 * @return Number of known paths.
2452 GCP_count_paths (const struct CadetPeer *peer)
2454 struct CadetPeerPath *iter;
2457 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2465 * Iterate all known peers.
2467 * @param iter Iterator.
2468 * @param cls Closure for @c iter.
2471 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2474 GNUNET_CONTAINER_multipeermap_iterate (peers,
2481 * Get the static string for a peer ID.
2485 * @return Static string for it's ID.
2488 GCP_2s (const struct CadetPeer *peer)
2492 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));