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 where we
160 * are the predecessor; indexed by tid; do NOT
161 * try to combine with @e connections_succ (#3794).
163 struct GNUNET_CONTAINER_MultiHashMap *connections_pred;
166 * Connections that go through this peer where we are
167 * the successor; indexed by tid;
169 struct GNUNET_CONTAINER_MultiHashMap *connections_succ;
172 * Handle for queued transmissions
174 struct GNUNET_CORE_TransmitHandle *core_transmit;
179 struct GNUNET_TIME_Absolute tmt_time;
182 * Transmission queue to core DLL head
184 struct CadetPeerQueue *queue_head;
187 * Transmission queue to core DLL tail
189 struct CadetPeerQueue *queue_tail;
192 * How many messages are in the queue to this peer.
194 unsigned int queue_n;
199 struct GNUNET_HELLO_Message* hello;
203 /******************************************************************************/
204 /******************************* GLOBALS ***********************************/
205 /******************************************************************************/
208 * Global handle to the statistics service.
210 extern struct GNUNET_STATISTICS_Handle *stats;
213 * Local peer own ID (full value).
215 extern struct GNUNET_PeerIdentity my_full_id;
218 * Local peer own ID (short)
220 extern GNUNET_PEER_Id myid;
223 * Peers known, indexed by PeerIdentity, values of type `struct CadetPeer`.
225 static struct GNUNET_CONTAINER_MultiPeerMap *peers;
228 * How many peers do we want to remember?
230 static unsigned long long max_peers;
233 * Percentage of messages that will be dropped (for test purposes only).
235 static unsigned long long drop_percent;
238 * Handle to communicate with core.
240 static struct GNUNET_CORE_Handle *core_handle;
243 * Handle to try to start new connections.
245 static struct GNUNET_TRANSPORT_Handle *transport_handle;
248 /******************************************************************************/
249 /***************************** DEBUG *********************************/
250 /******************************************************************************/
253 * Log all kinds of info about the queueing status of a peer.
255 * @param p Peer whose queue to show.
256 * @param level Error level to use for logging.
259 queue_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
261 struct CadetPeerQueue *q;
264 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
266 __FILE__, __FUNCTION__, __LINE__);
270 LOG2 (level, "QQQ Message queue towards %s\n", GCP_2s (p));
271 LOG2 (level, "QQQ queue length: %u\n", p->queue_n);
272 LOG2 (level, "QQQ core tmt rdy: %p\n", p->core_transmit);
274 for (q = p->queue_head; NULL != q; q = q->next)
276 LOG2 (level, "QQQ - %s %s on %s\n",
277 GC_m2s (q->type), GC_f2s (q->fwd), GCC_2s (q->c));
278 LOG2 (level, "QQQ payload %s, %u\n",
279 GC_m2s (q->payload_type), q->payload_id);
280 LOG2 (level, "QQQ size: %u bytes\n", q->size);
283 LOG2 (level, "QQQ End queue towards %s\n", GCP_2s (p));
288 * Log all kinds of info about a peer.
293 GCP_debug (const struct CadetPeer *p, enum GNUNET_ErrorType level)
295 struct CadetPeerPath *path;
299 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
301 __FILE__, __FUNCTION__, __LINE__);
307 LOG2 (level, "PPP DEBUG PEER NULL\n");
311 LOG2 (level, "PPP DEBUG PEER %s\n", GCP_2s (p));
312 LOG2 (level, "PPP last contact %s\n",
313 GNUNET_STRINGS_absolute_time_to_string (p->last_contact));
314 for (path = p->path_head; NULL != path; path = path->next)
319 LOG2 (level, "PPP path: %s\n", s);
323 LOG2 (level, "PPP core transmit handle %p\n", p->core_transmit);
324 LOG2 (level, "PPP DHT GET handle %p\n", p->search_h);
326 if (NULL != p->connections_pred)
327 conns = GNUNET_CONTAINER_multihashmap_size (p->connections_pred);
328 if (NULL != p->connections_succ)
329 conns += GNUNET_CONTAINER_multihashmap_size (p->connections_succ);
330 LOG2 (level, "PPP # connections over link to peer: %u\n", conns);
331 queue_debug (p, level);
332 LOG2 (level, "PPP DEBUG END\n");
336 /******************************************************************************/
337 /***************************** CORE HELPERS *********************************/
338 /******************************************************************************/
342 * Iterator to notify all connections of a broken link. Mark connections
343 * to destroy after all traffic has been sent.
345 * @param cls Closure (peer disconnected).
346 * @param key Current key code (peer id).
347 * @param value Value in the hash map (connection).
349 * @return #GNUNET_YES to continue to iterate.
352 notify_broken (void *cls,
353 const struct GNUNET_HashCode *key,
356 struct CadetPeer *peer = cls;
357 struct CadetConnection *c = value;
359 LOG (GNUNET_ERROR_TYPE_DEBUG,
360 "Notifying %s due to %s\n",
363 GCC_notify_broken (c,
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 *mp;
408 struct CadetPeerPath *path;
411 GNUNET_snprintf (own_id,
414 GNUNET_i2s (&my_full_id));
418 LOG (GNUNET_ERROR_TYPE_INFO,
419 "CONNECTED %s (self)\n",
425 LOG (GNUNET_ERROR_TYPE_INFO,
426 "CONNECTED %s <= %s\n",
430 path->peers[1] = mp->id;
431 GNUNET_PEER_change_rc (mp->id, 1);
433 path->peers[0] = myid;
434 GNUNET_PEER_change_rc (myid, 1);
435 GCP_add_path (mp, path, GNUNET_YES);
436 GNUNET_STATISTICS_update (stats,
440 GNUNET_assert (NULL == mp->connections_pred);
441 GNUNET_assert (NULL == mp->connections_succ);
442 mp->connections_pred = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_YES);
443 mp->connections_succ = GNUNET_CONTAINER_multihashmap_create (16, GNUNET_YES);
445 if ( (NULL != GCP_get_tunnel (mp)) &&
446 (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, peer)) )
452 * Method called whenever a peer disconnects.
455 * @param peer peer identity this notification is about
458 core_disconnect (void *cls,
459 const struct GNUNET_PeerIdentity *peer)
462 struct CadetPeerPath *direct_path;
465 strncpy (own_id, GNUNET_i2s (&my_full_id), 15);
466 p = GNUNET_CONTAINER_multipeermap_get (peers,
474 LOG (GNUNET_ERROR_TYPE_INFO,
475 "DISCONNECTED %s (self)\n",
478 LOG (GNUNET_ERROR_TYPE_INFO,
479 "DISCONNECTED %s <= %s\n",
480 own_id, GNUNET_i2s (peer));
481 direct_path = pop_direct_path (p);
482 GNUNET_CONTAINER_multihashmap_iterate (p->connections_succ,
485 GNUNET_CONTAINER_multihashmap_iterate (p->connections_pred,
488 GNUNET_CONTAINER_multihashmap_destroy (p->connections_succ);
489 p->connections_succ = NULL;
490 GNUNET_CONTAINER_multihashmap_destroy (p->connections_pred);
491 p->connections_pred = NULL;
492 if (NULL != p->core_transmit)
494 GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit);
495 p->core_transmit = NULL;
496 p->tmt_time.abs_value_us = 0;
498 GNUNET_STATISTICS_update (stats,
502 path_destroy (direct_path);
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}
528 * To be called on core init/fail.
530 * @param cls Closure (config)
531 * @param identity the public identity of this peer
534 core_init (void *cls,
535 const struct GNUNET_PeerIdentity *identity)
537 const struct GNUNET_CONFIGURATION_Handle *c = cls;
540 LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n");
541 if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id)))
543 LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n"));
544 LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity));
545 LOG (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id));
546 GNUNET_CORE_disconnect (core_handle);
547 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
548 NULL, /* Closure passed to CADET functions */
549 &core_init, /* Call core_init once connected */
550 &core_connect, /* Handle connects */
551 &core_disconnect, /* remove peers on disconnects */
552 NULL, /* Don't notify about all incoming messages */
553 GNUNET_NO, /* For header only in notification */
554 NULL, /* Don't notify about all outbound messages */
555 GNUNET_NO, /* For header-only out notification */
556 core_handlers); /* Register these handlers */
565 * Core callback to write a pre-constructed data packet to core buffer
567 * @param cls Closure (CadetTransmissionDescriptor with data in "data" member).
568 * @param size Number of bytes available in buf.
569 * @param buf Where the to write the message.
571 * @return number of bytes written to buf
574 send_core_data_raw (void *cls, size_t size, void *buf)
576 struct GNUNET_MessageHeader *msg = cls;
579 GNUNET_assert (NULL != msg);
580 total_size = ntohs (msg->size);
582 if (total_size > size)
587 memcpy (buf, msg, total_size);
594 * Function to send a create connection message to a peer.
596 * @param c Connection to create.
597 * @param size number of bytes available in buf
598 * @param buf where the callee should write the message
599 * @return number of bytes written to buf
602 send_core_connection_create (struct CadetConnection *c, size_t size, void *buf)
604 struct GNUNET_CADET_ConnectionCreate *msg;
605 struct GNUNET_PeerIdentity *peer_ptr;
606 const struct CadetPeerPath *p = GCC_get_path (c);
613 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n");
615 sizeof (struct GNUNET_CADET_ConnectionCreate) +
616 p->length * sizeof (struct GNUNET_PeerIdentity);
618 if (size < size_needed || NULL == buf)
623 msg = (struct GNUNET_CADET_ConnectionCreate *) buf;
624 msg->header.size = htons (size_needed);
625 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE);
626 msg->cid = *GCC_get_id (c);
628 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
629 for (i = 0; i < p->length; i++)
631 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
634 LOG (GNUNET_ERROR_TYPE_DEBUG,
635 "CONNECTION CREATE (%u bytes long) sent!\n",
642 * Creates a path ack message in buf and frees all unused resources.
644 * @param c Connection to send an ACK on.
645 * @param size number of bytes available in buf
646 * @param buf where the callee should write the message
648 * @return number of bytes written to buf
651 send_core_connection_ack (struct CadetConnection *c, size_t size, void *buf)
653 struct GNUNET_CADET_ConnectionACK *msg = buf;
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n");
656 if (sizeof (struct GNUNET_CADET_ConnectionACK) > size)
661 msg->header.size = htons (sizeof (struct GNUNET_CADET_ConnectionACK));
662 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK);
663 msg->cid = *GCC_get_id (c);
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n");
666 return sizeof (struct GNUNET_CADET_ConnectionACK);
670 /******************************************************************************/
671 /******************************** STATIC ***********************************/
672 /******************************************************************************/
676 * Get priority for a queued message.
678 * @param q Queued message
680 * @return CORE priority to use.
682 static enum GNUNET_CORE_Priority
683 get_priority (struct CadetPeerQueue *q)
685 enum GNUNET_CORE_Priority low;
686 enum GNUNET_CORE_Priority high;
691 return GNUNET_CORE_PRIO_BACKGROUND;
694 /* Relayed traffic has lower priority, our own traffic has higher */
695 if (NULL == q->c || GNUNET_NO == GCC_is_origin (q->c, q->fwd))
697 low = GNUNET_CORE_PRIO_BEST_EFFORT;
698 high = GNUNET_CORE_PRIO_URGENT;
702 low = GNUNET_CORE_PRIO_URGENT;
703 high = GNUNET_CORE_PRIO_CRITICAL_CONTROL;
706 /* Bulky payload has lower priority, control traffic has higher. */
707 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == q->type
708 || GNUNET_MESSAGE_TYPE_CADET_AX == q->type)
716 * Iterator over tunnel hash map entries to destroy the tunnel during shutdown.
719 * @param key current key code
720 * @param value value in the hash map
721 * @return #GNUNET_YES if we should continue to iterate,
725 shutdown_tunnel (void *cls,
726 const struct GNUNET_PeerIdentity *key,
729 struct CadetPeer *p = value;
730 struct CadetTunnel *t = p->tunnel;
740 * Check if peer is searching for a path (either active or delayed search).
742 * @param peer Peer to check
743 * @return #GNUNET_YES if there is a search active.
744 * #GNUNET_NO otherwise.
747 is_searching (const struct CadetPeer *peer)
749 return (NULL == peer->search_h && NULL == peer->search_delayed) ?
750 GNUNET_NO : GNUNET_YES;
755 * @brief Start a search for a peer.
757 * @param cls Closure (Peer to search for).
758 * @param tc Task context.
761 delayed_search (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
763 struct CadetPeer *peer = cls;
765 peer->search_delayed = NULL;
767 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
770 GCP_start_search (peer);
775 * Destroy the peer_info and free any allocated resources linked to it
777 * @param peer The peer_info to destroy.
778 * @return #GNUNET_OK on success
781 peer_destroy (struct CadetPeer *peer)
783 struct GNUNET_PeerIdentity id;
784 struct CadetPeerPath *p;
785 struct CadetPeerPath *nextp;
787 GNUNET_PEER_resolve (peer->id, &id);
788 GNUNET_PEER_change_rc (peer->id, -1);
790 LOG (GNUNET_ERROR_TYPE_WARNING,
791 "destroying peer %s\n",
795 GNUNET_CONTAINER_multipeermap_remove (peers,
800 LOG (GNUNET_ERROR_TYPE_WARNING, " not in peermap!!\n");
802 GCP_stop_search (peer);
807 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p);
811 GCT_destroy_empty (peer->tunnel);
818 * Returns if peer is used (has a tunnel or is neighbor).
820 * @param peer Peer to check.
821 * @return #GNUNET_YES if peer is in use.
824 peer_is_used (struct CadetPeer *peer)
826 struct CadetPeerPath *p;
828 if (NULL != peer->tunnel)
831 for (p = peer->path_head; NULL != p; p = p->next)
841 * Iterator over all the peers to get the oldest timestamp.
843 * @param cls Closure (unsued).
844 * @param key ID of the peer.
845 * @param value Peer_Info of the peer.
848 peer_get_oldest (void *cls,
849 const struct GNUNET_PeerIdentity *key,
852 struct CadetPeer *p = value;
853 struct GNUNET_TIME_Absolute *abs = cls;
855 /* Don't count active peers */
856 if (GNUNET_YES == peer_is_used (p))
859 if (abs->abs_value_us < p->last_contact.abs_value_us)
860 abs->abs_value_us = p->last_contact.abs_value_us;
867 * Iterator over all the peers to remove the oldest entry.
869 * @param cls Closure (unsued).
870 * @param key ID of the peer.
871 * @param value Peer_Info of the peer.
874 peer_timeout (void *cls,
875 const struct GNUNET_PeerIdentity *key,
878 struct CadetPeer *p = value;
879 struct GNUNET_TIME_Absolute *abs = cls;
881 LOG (GNUNET_ERROR_TYPE_WARNING,
882 "peer %s timeout\n", GNUNET_i2s (key));
884 if (p->last_contact.abs_value_us == abs->abs_value_us &&
885 GNUNET_NO == peer_is_used (p))
895 * Delete oldest unused peer.
898 peer_delete_oldest (void)
900 struct GNUNET_TIME_Absolute abs;
902 abs = GNUNET_TIME_UNIT_FOREVER_ABS;
904 GNUNET_CONTAINER_multipeermap_iterate (peers,
907 GNUNET_CONTAINER_multipeermap_iterate (peers,
914 * Choose the best (yet unused) path towards a peer,
915 * considering the tunnel properties.
917 * @param peer The destination peer.
918 * @return Best current known path towards the peer, if any.
920 static struct CadetPeerPath *
921 peer_get_best_path (const struct CadetPeer *peer)
923 struct CadetPeerPath *best_p;
924 struct CadetPeerPath *p;
925 unsigned int best_cost;
928 best_cost = UINT_MAX;
930 for (p = peer->path_head; NULL != p; p = p->next)
932 if (GNUNET_NO == path_is_valid (p))
933 continue; /* Don't use invalid paths. */
934 if (GNUNET_YES == GCT_is_path_used (peer->tunnel, p))
935 continue; /* If path is already in use, skip it. */
937 if ((cost = GCT_get_path_cost (peer->tunnel, p)) < best_cost)
948 * Is this queue element sendable?
950 * - All management traffic is always sendable.
951 * - For payload traffic, check the connection flow control.
953 * @param q Queue element to inspect.
954 * @return #GNUNET_YES if it is sendable, #GNUNET_NO otherwise.
957 queue_is_sendable (struct CadetPeerQueue *q)
959 /* Is PID-independent? */
962 case GNUNET_MESSAGE_TYPE_CADET_ACK:
963 case GNUNET_MESSAGE_TYPE_CADET_POLL:
964 case GNUNET_MESSAGE_TYPE_CADET_KX:
965 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
966 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
967 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
968 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
971 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
972 case GNUNET_MESSAGE_TYPE_CADET_AX:
979 return GCC_is_sendable (q->c, q->fwd);
984 * Get first sendable message.
986 * @param peer The destination peer.
988 * @return First transmittable message, if any. Otherwise, NULL.
990 static struct CadetPeerQueue *
991 peer_get_first_message (const struct CadetPeer *peer)
993 struct CadetPeerQueue *q;
995 for (q = peer->queue_head; NULL != q; q = q->next)
997 LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking q:%p on c:%s\n", q, GCC_2s (q->c));
998 if (queue_is_sendable (q))
1007 * Function to process paths received for a new peer addition. The recorded
1008 * paths form the initial tunnel, which can be optimized later.
1009 * Called on each result obtained for the DHT search.
1011 * @param cls closure
1015 search_handler (void *cls, const struct CadetPeerPath *path)
1017 struct CadetPeer *peer = cls;
1018 unsigned int connection_count;
1020 GCP_add_path_to_all (path, GNUNET_NO);
1022 /* Count connections */
1023 connection_count = GCT_count_connections (peer->tunnel);
1025 /* If we already have our minimum (or more) connections, it's enough */
1026 if (CONNECTIONS_PER_TUNNEL <= connection_count)
1029 if (CADET_TUNNEL_SEARCHING == GCT_get_cstate (peer->tunnel))
1031 LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n");
1038 * Adjust core requested size to accomodate an ACK.
1040 * @param message_size Requested size.
1042 * @return Size enough to fit @c message_size and an ACK.
1045 get_core_size (size_t message_size)
1047 return message_size + sizeof (struct GNUNET_CADET_ACK);
1052 * Fill a core buffer with the appropriate data for the queued message.
1054 * @param queue Queue element for the message.
1055 * @param buf Core buffer to fill.
1056 * @param size Size remaining in @c buf.
1057 * @param[out] pid In case its an encrypted payload, set payload.
1059 * @return Bytes written to @c buf.
1062 fill_buf (struct CadetPeerQueue *queue, void *buf, size_t size, uint32_t *pid)
1064 struct CadetConnection *c = queue->c;
1067 switch (queue->type)
1069 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1070 *pid = GCC_get_pid (queue->c, queue->fwd);
1071 LOG (GNUNET_ERROR_TYPE_DEBUG, " otr payload ID %u\n", *pid);
1072 msg_size = send_core_data_raw (queue->cls, size, buf);
1073 ((struct GNUNET_CADET_Encrypted *) buf)->pid = htonl (*pid);
1075 case GNUNET_MESSAGE_TYPE_CADET_AX:
1076 *pid = GCC_get_pid (queue->c, queue->fwd);
1077 LOG (GNUNET_ERROR_TYPE_DEBUG, " ax payload ID %u\n", *pid);
1078 msg_size = send_core_data_raw (queue->cls, size, buf);
1079 ((struct GNUNET_CADET_AX *) buf)->pid = htonl (*pid);
1081 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1082 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1083 case GNUNET_MESSAGE_TYPE_CADET_KX:
1084 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1085 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1086 LOG (GNUNET_ERROR_TYPE_DEBUG, " raw %s\n", GC_m2s (queue->type));
1087 msg_size = send_core_data_raw (queue->cls, size, buf);
1089 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1090 LOG (GNUNET_ERROR_TYPE_DEBUG, " path create\n");
1091 if (GCC_is_origin (c, GNUNET_YES))
1092 msg_size = send_core_connection_create (c, size, buf);
1094 msg_size = send_core_data_raw (queue->cls, size, buf);
1096 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1097 LOG (GNUNET_ERROR_TYPE_DEBUG, " path ack\n");
1098 if (GCC_is_origin (c, GNUNET_NO) ||
1099 GCC_is_origin (c, GNUNET_YES))
1101 msg_size = send_core_connection_ack (c, size, buf);
1105 msg_size = send_core_data_raw (queue->cls, size, buf);
1108 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1109 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1110 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1111 /* This should be encapsulted */
1117 LOG (GNUNET_ERROR_TYPE_WARNING, " type unknown: %u\n", queue->type);
1121 GNUNET_assert (size >= msg_size);
1128 * Core callback to write a queued packet to core buffer
1130 * @param cls Closure (peer info).
1131 * @param size Number of bytes available in buf.
1132 * @param buf Where the to write the message.
1134 * @return number of bytes written to buf
1137 queue_send (void *cls, size_t size, void *buf)
1139 struct CadetPeer *peer = cls;
1140 struct CadetConnection *c;
1141 struct CadetPeerQueue *queue;
1142 struct GNUNET_TIME_Relative core_wait_time;
1143 const struct GNUNET_PeerIdentity *dst_id;
1150 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1151 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1152 LOG (GNUNET_ERROR_TYPE_DEBUG, "Queue send towards %s (max %u)\n",
1153 GCP_2s (peer), size);
1155 /* Sanity checking */
1156 if (NULL == buf || 0 == size)
1158 LOG (GNUNET_ERROR_TYPE_DEBUG, "Buffer size 0.\n");
1159 peer->tmt_time.abs_value_us = 0;
1160 peer->core_transmit = NULL;
1169 peer->core_transmit = NULL;
1170 queue = peer_get_first_message (peer);
1173 GNUNET_break (0); /* Core tmt_rdy should've been canceled */
1174 peer->tmt_time.abs_value_us = 0;
1177 core_wait_time = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1178 LOG (GNUNET_ERROR_TYPE_DEBUG, " core wait time %s\n",
1179 GNUNET_STRINGS_relative_time_to_string (core_wait_time, GNUNET_NO));
1180 peer->tmt_time.abs_value_us = 0;
1182 /* Copy all possible messages to the core buffer */
1183 while (NULL != queue && rest >= queue->size)
1187 LOG (GNUNET_ERROR_TYPE_DEBUG, " on connection %s %s\n",
1188 GCC_2s (c), GC_f2s(queue->fwd));
1189 LOG (GNUNET_ERROR_TYPE_DEBUG, " size %u ok (%u/%u)\n",
1190 queue->size, total_size, size);
1192 msg_size = fill_buf (queue, (void *) dst, size, &pid);
1194 if (0 < drop_percent &&
1195 GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent)
1197 LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s (%s %u) on connection %s %s\n",
1198 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1199 queue->payload_id, GCC_2s (c), GC_f2s (queue->fwd));
1204 LOG (GNUNET_ERROR_TYPE_INFO,
1205 "snd %s (%s %4u) on connection %s (%p) %s (size %u)\n",
1206 GC_m2s (queue->type), GC_m2s (queue->payload_type),
1207 queue->payload_id, GCC_2s (c), c, GC_f2s (queue->fwd), msg_size);
1209 total_size += msg_size;
1211 dst = &dst[msg_size];
1214 /* Free queue, but cls was freed by send_core_* in fill_buf. */
1215 (void) GCP_queue_destroy (queue, GNUNET_NO, GNUNET_YES, pid);
1218 queue = peer_get_first_message (peer);
1221 /* If more data in queue, send next */
1224 LOG (GNUNET_ERROR_TYPE_DEBUG, " more data! (%u)\n", queue->size);
1225 if (NULL == peer->core_transmit)
1227 dst_id = GNUNET_PEER_resolve2 (peer->id);
1228 peer->core_transmit =
1229 GNUNET_CORE_notify_transmit_ready (core_handle,
1230 GNUNET_NO, get_priority (queue),
1231 GNUNET_TIME_UNIT_FOREVER_REL,
1233 get_core_size (queue->size),
1236 peer->tmt_time = GNUNET_TIME_absolute_get ();
1237 queue->start_waiting = GNUNET_TIME_absolute_get ();
1241 LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n");
1243 // GCC_start_poll (); FIXME needed?
1247 // GCC_stop_poll(); FIXME needed?
1250 LOG (GNUNET_ERROR_TYPE_DEBUG, " return %d\n", total_size);
1251 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1257 /******************************************************************************/
1258 /******************************** API ***********************************/
1259 /******************************************************************************/
1263 * Free a transmission that was already queued with all resources
1264 * associated to the request.
1266 * If connection was marked to be destroyed, and this was the last queued
1267 * message on it, the connection will be free'd as a result.
1269 * @param queue Queue handler to cancel.
1270 * @param clear_cls Is it necessary to free associated cls?
1271 * @param sent Was it really sent? (Could have been canceled)
1272 * @param pid PID, if relevant (was sent and was a payload message).
1274 * @return #GNUNET_YES if connection was destroyed as a result,
1275 * #GNUNET_NO otherwise.
1278 GCP_queue_destroy (struct CadetPeerQueue *queue, int clear_cls,
1279 int sent, uint32_t pid)
1281 struct CadetPeer *peer;
1282 int connection_destroyed;
1285 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy %s\n", GC_m2s (queue->type));
1286 if (GNUNET_YES == clear_cls)
1288 LOG (GNUNET_ERROR_TYPE_DEBUG, " free cls\n");
1289 switch (queue->type)
1291 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1292 LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n");
1294 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1295 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1296 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1297 case GNUNET_MESSAGE_TYPE_CADET_KX:
1298 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1299 case GNUNET_MESSAGE_TYPE_CADET_AX:
1300 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1301 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1302 GNUNET_free_non_null (queue->cls);
1307 LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n",
1308 GC_m2s (queue->type));
1311 GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue);
1313 if (queue->type != GNUNET_MESSAGE_TYPE_CADET_ACK &&
1314 queue->type != GNUNET_MESSAGE_TYPE_CADET_POLL)
1319 if (NULL != queue->cont)
1321 struct GNUNET_TIME_Relative wait_time;
1323 wait_time = GNUNET_TIME_absolute_get_duration (queue->start_waiting);
1324 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback, time elapsed %s\n",
1325 GNUNET_STRINGS_relative_time_to_string (wait_time, GNUNET_NO));
1326 connection_destroyed = queue->cont (queue->cont_cls,
1327 queue->c, sent, queue->type, pid,
1328 queue->fwd, queue->size, wait_time);
1332 connection_destroyed = GNUNET_NO;
1335 if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit)
1337 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1338 peer->core_transmit = NULL;
1339 peer->tmt_time.abs_value_us = 0;
1342 GNUNET_free (queue);
1343 return connection_destroyed;
1348 * @brief Queue and pass message to core when possible.
1350 * @param peer Peer towards which to queue the message.
1351 * @param cls Closure (@c type dependant). It will be used by queue_send to
1352 * build the message to be sent if not already prebuilt.
1353 * @param type Type of the message, 0 for a raw message.
1354 * @param size Size of the message.
1355 * @param c Connection this message belongs to (can be NULL).
1356 * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!)
1357 * @param cont Continuation to be called once CORE has taken the message.
1358 * @param cont_cls Closure for @c cont.
1360 * @return Handle to cancel the message before it is sent. Once cont is called
1361 * message has been sent and therefore the handle is no longer valid.
1363 struct CadetPeerQueue *
1364 GCP_queue_add (struct CadetPeer *peer, void *cls, uint16_t type,
1365 uint16_t payload_type, uint32_t payload_id, size_t size,
1366 struct CadetConnection *c, int fwd,
1367 GCP_sent cont, void *cont_cls)
1369 struct CadetPeerQueue *q;
1374 if (NULL == c && GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN != type)
1375 error_level = GNUNET_ERROR_TYPE_ERROR;
1377 error_level = GNUNET_ERROR_TYPE_INFO;
1379 "que %s (%s %4u) on connection %s (%p) %s towards %s (size %u)\n",
1380 GC_m2s (type), GC_m2s (payload_type), payload_id,
1381 GCC_2s (c), c, GC_f2s (fwd), GCP_2s (peer), size);
1383 if (error_level == GNUNET_ERROR_TYPE_ERROR)
1385 if ( (NULL == peer->connections_pred) ||
1386 (NULL == peer->connections_succ) )
1388 /* We are not connected to this peer, ignore request. */
1389 LOG (GNUNET_ERROR_TYPE_WARNING, "%s not a neighbor\n", GCP_2s (peer));
1390 GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1,
1397 if (GNUNET_MESSAGE_TYPE_CADET_POLL == type ||
1398 GNUNET_MESSAGE_TYPE_CADET_ACK == type)
1403 LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority);
1405 call_core = (NULL == c || type == GNUNET_MESSAGE_TYPE_CADET_KX) ?
1406 GNUNET_YES : GCC_is_sendable (c, fwd);
1407 q = GNUNET_new (struct CadetPeerQueue);
1410 q->payload_type = payload_type;
1411 q->payload_id = payload_id;
1417 q->cont_cls = cont_cls;
1420 GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, q);
1425 GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, q);
1426 call_core = GNUNET_YES;
1429 q->start_waiting = GNUNET_TIME_absolute_get ();
1430 if (NULL == peer->core_transmit && GNUNET_YES == call_core)
1432 LOG (GNUNET_ERROR_TYPE_DEBUG,
1433 "calling core tmt rdy towards %s for %u bytes\n",
1434 GCP_2s (peer), size);
1435 peer->core_transmit =
1436 GNUNET_CORE_notify_transmit_ready (core_handle,
1437 GNUNET_NO, get_priority (q),
1438 GNUNET_TIME_UNIT_FOREVER_REL,
1439 GNUNET_PEER_resolve2 (peer->id),
1440 get_core_size (size),
1442 peer->tmt_time = GNUNET_TIME_absolute_get ();
1444 else if (GNUNET_NO == call_core)
1446 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n",
1452 struct GNUNET_TIME_Relative elapsed;
1453 elapsed = GNUNET_TIME_absolute_get_duration (peer->tmt_time);
1454 LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called %s\n",
1456 GNUNET_STRINGS_relative_time_to_string (elapsed, GNUNET_NO));
1459 queue_debug (peer, GNUNET_ERROR_TYPE_DEBUG);
1465 * Cancel all queued messages to a peer that belong to a certain connection.
1467 * @param peer Peer towards whom to cancel.
1468 * @param c Connection whose queued messages to cancel. Might be destroyed by
1469 * the sent continuation call.
1472 GCP_queue_cancel (struct CadetPeer *peer, struct CadetConnection *c)
1474 struct CadetPeerQueue *q;
1475 struct CadetPeerQueue *next;
1476 struct CadetPeerQueue *prev;
1477 int connection_destroyed;
1479 connection_destroyed = GNUNET_NO;
1480 for (q = peer->queue_head; NULL != q; q = next)
1485 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP queue cancel %s\n", GC_m2s (q->type));
1486 GNUNET_break (GNUNET_NO == connection_destroyed);
1487 if (GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY == q->type)
1493 connection_destroyed = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1496 /* Get next from prev, q->next might be already freed:
1497 * queue destroy -> callback -> GCC_destroy -> cancel_queues -> here
1500 next = peer->queue_head;
1510 if (NULL == peer->queue_head && NULL != peer->core_transmit)
1512 GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit);
1513 peer->core_transmit = NULL;
1514 peer->tmt_time.abs_value_us = 0;
1520 * Get the first transmittable message for a connection.
1522 * @param peer Neighboring peer.
1523 * @param c Connection.
1525 * @return First transmittable message.
1527 static struct CadetPeerQueue *
1528 connection_get_first_message (struct CadetPeer *peer, struct CadetConnection *c)
1530 struct CadetPeerQueue *q;
1532 for (q = peer->queue_head; NULL != q; q = q->next)
1536 if (queue_is_sendable (q))
1538 LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n");
1541 LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n");
1549 * Get the first message for a connection and unqueue it.
1551 * Only tunnel (or higher) level messages are unqueued. Connection specific
1552 * messages are silently destroyed upon encounter.
1554 * @param peer Neighboring peer.
1555 * @param c Connection.
1556 * @param destroyed[in/out] Was the connection destroyed (prev/as a result)?.
1559 * @return First message for this connection.
1561 struct GNUNET_MessageHeader *
1562 GCP_connection_pop (struct CadetPeer *peer,
1563 struct CadetConnection *c,
1566 struct CadetPeerQueue *q;
1567 struct CadetPeerQueue *next;
1568 struct GNUNET_MessageHeader *msg;
1571 GNUNET_assert (NULL != destroyed);
1572 LOG (GNUNET_ERROR_TYPE_DEBUG, "connection_pop on connection %p\n", c);
1573 for (q = peer->queue_head; NULL != q; q = next)
1578 LOG (GNUNET_ERROR_TYPE_DEBUG, " - queued: %s (%s %u), cont: %p\n",
1579 GC_m2s (q->type), GC_m2s (q->payload_type), q->payload_id,
1583 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_CREATE:
1584 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_ACK:
1585 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_DESTROY:
1586 case GNUNET_MESSAGE_TYPE_CADET_CONNECTION_BROKEN:
1587 case GNUNET_MESSAGE_TYPE_CADET_ACK:
1588 case GNUNET_MESSAGE_TYPE_CADET_POLL:
1589 dest = GCP_queue_destroy (q, GNUNET_YES, GNUNET_NO, 0);
1590 if (GNUNET_YES == dest)
1592 GNUNET_break (GNUNET_NO == *destroyed);
1593 *destroyed = GNUNET_YES;
1597 case GNUNET_MESSAGE_TYPE_CADET_KX:
1598 case GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED:
1599 case GNUNET_MESSAGE_TYPE_CADET_AX:
1600 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
1601 msg = (struct GNUNET_MessageHeader *) q->cls;
1602 dest = GCP_queue_destroy (q, GNUNET_NO, GNUNET_NO, 0);
1603 if (GNUNET_YES == dest)
1605 GNUNET_break (GNUNET_NO == *destroyed);
1606 *destroyed = GNUNET_YES;
1612 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unknown message %s\n", GC_m2s (q->type));
1620 * Unlock a possibly locked queue for a connection.
1622 * If there is a message that can be sent on this connection, call core for it.
1623 * Otherwise (if core transmit is already called or there is no sendable
1624 * message) do nothing.
1626 * @param peer Peer who keeps the queue.
1627 * @param c Connection whose messages to unlock.
1630 GCP_queue_unlock (struct CadetPeer *peer, struct CadetConnection *c)
1632 struct CadetPeerQueue *q;
1635 if (NULL != peer->core_transmit)
1637 LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n");
1638 return; /* Already unlocked */
1641 q = connection_get_first_message (peer, c);
1644 LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n");
1645 return; /* Nothing to transmit */
1649 peer->core_transmit =
1650 GNUNET_CORE_notify_transmit_ready (core_handle,
1651 GNUNET_NO, get_priority (q),
1652 GNUNET_TIME_UNIT_FOREVER_REL,
1653 GNUNET_PEER_resolve2 (peer->id),
1654 get_core_size (size),
1657 peer->tmt_time = GNUNET_TIME_absolute_get ();
1662 * Initialize the peer subsystem.
1664 * @param c Configuration.
1667 GCP_init (const struct GNUNET_CONFIGURATION_Handle *c)
1669 LOG (GNUNET_ERROR_TYPE_DEBUG,
1671 peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1673 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "MAX_PEERS",
1676 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
1677 "CADET", "MAX_PEERS", "USING DEFAULT");
1682 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DROP_PERCENT",
1689 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1690 LOG (GNUNET_ERROR_TYPE_WARNING, "Cadet is running with DROP enabled.\n");
1691 LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n");
1692 LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n");
1693 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1696 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
1697 NULL, /* Closure passed to CADET functions */
1698 &core_init, /* Call core_init once connected */
1699 &core_connect, /* Handle connects */
1700 &core_disconnect, /* remove peers on disconnects */
1701 NULL, /* Don't notify about all incoming messages */
1702 GNUNET_NO, /* For header only in notification */
1703 NULL, /* Don't notify about all outbound messages */
1704 GNUNET_NO, /* For header-only out notification */
1705 core_handlers); /* Register these handlers */
1707 GNUNET_CONFIGURATION_get_value_yesno (c, "CADET", "DISABLE_TRY_CONNECT"))
1709 transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */
1710 /* Notify callbacks */
1715 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1716 LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n");
1717 LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n");
1718 LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n");
1719 transport_handle = NULL;
1724 if (NULL == core_handle)
1727 GNUNET_SCHEDULER_shutdown ();
1735 * Shut down the peer subsystem.
1740 GNUNET_CONTAINER_multipeermap_iterate (peers,
1743 if (NULL != core_handle)
1745 GNUNET_CORE_disconnect (core_handle);
1748 if (NULL != transport_handle)
1750 GNUNET_TRANSPORT_disconnect (transport_handle);
1751 transport_handle = NULL;
1753 GNUNET_PEER_change_rc (myid, -1);
1754 GNUNET_CONTAINER_multipeermap_destroy (peers);
1760 * Retrieve the CadetPeer stucture associated with the peer, create one
1761 * and insert it in the appropriate structures if the peer is not known yet.
1763 * @param peer_id Full identity of the peer.
1765 * @return Existing or newly created peer structure.
1768 GCP_get (const struct GNUNET_PeerIdentity *peer_id)
1770 struct CadetPeer *peer;
1772 peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id);
1775 peer = GNUNET_new (struct CadetPeer);
1776 if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers)
1778 peer_delete_oldest ();
1780 GNUNET_CONTAINER_multipeermap_put (peers,
1783 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1784 peer->id = GNUNET_PEER_intern (peer_id);
1786 peer->last_contact = GNUNET_TIME_absolute_get ();
1793 * Retrieve the CadetPeer stucture associated with the peer, create one
1794 * and insert it in the appropriate structures if the peer is not known yet.
1796 * @param peer Short identity of the peer.
1798 * @return Existing or newly created peer structure.
1801 GCP_get_short (const GNUNET_PEER_Id peer)
1803 return GCP_get (GNUNET_PEER_resolve2 (peer));
1808 * Try to connect to a peer on transport level.
1810 * @param cls Closure (peer).
1811 * @param tc TaskContext.
1814 try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1816 struct CadetPeer *peer = cls;
1818 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
1821 GNUNET_TRANSPORT_try_connect (transport_handle,
1822 GNUNET_PEER_resolve2 (peer->id), NULL, NULL);
1827 * Try to establish a new connection to this peer (in its tunnel).
1828 * If the peer doesn't have any path to it yet, try to get one.
1829 * If the peer already has some path, send a CREATE CONNECTION towards it.
1831 * @param peer Peer to connect to.
1834 GCP_connect (struct CadetPeer *peer)
1836 struct CadetTunnel *t;
1837 struct CadetPeerPath *p;
1838 struct CadetConnection *c;
1841 LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GCP_2s (peer));
1843 /* If we have a current hello, try to connect using it. */
1844 GCP_try_connect (peer);
1848 rerun_search = GNUNET_NO;
1850 if (NULL != peer->path_head)
1852 LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n");
1853 p = peer_get_best_path (peer);
1859 LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s);
1862 c = GCT_use_path (t, p);
1865 /* This case can happen when the path includes a first hop that is
1866 * not yet known to be connected.
1868 * This happens quite often during testing when running cadet
1869 * under valgrind: core connect notifications come very late
1870 * and the DHT result has already come and created a valid
1871 * path. In this case, the peer->connections_{pred,succ}
1872 * hashmaps will be NULL and tunnel_use_path will not be able
1873 * to create a connection from that path.
1875 * Re-running the DHT GET should give core time to callback.
1877 * GCT_use_path -> GCC_new -> register_neighbors takes care of
1878 * updating statistics about this issue.
1880 rerun_search = GNUNET_YES;
1884 GCC_send_create (c);
1890 LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n");
1894 if (GNUNET_YES == rerun_search)
1896 struct GNUNET_TIME_Relative delay;
1898 GCP_stop_search (peer);
1899 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 100);
1900 peer->search_delayed = GNUNET_SCHEDULER_add_delayed (delay, &delayed_search,
1905 if (GNUNET_NO == is_searching (peer))
1906 GCP_start_search (peer);
1911 * Chech whether there is a direct (core level) connection to peer.
1913 * @param peer Peer to check.
1915 * @return #GNUNET_YES if there is a direct connection.
1918 GCP_is_neighbor (const struct CadetPeer *peer)
1920 struct CadetPeerPath *path;
1922 if ( (NULL == peer->connections_pred) ||
1923 (NULL == peer->connections_succ) )
1926 for (path = peer->path_head; NULL != path; path = path->next)
1928 if (3 > path->length)
1932 /* Is not a neighbor but connections is not NULL, probably disconnecting */
1938 * Create and initialize a new tunnel towards a peer, in case it has none.
1939 * In case the peer already has a tunnel, nothing is done.
1941 * Does not generate any traffic, just creates the local data structures.
1943 * @param peer Peer towards which to create the tunnel.
1946 GCP_add_tunnel (struct CadetPeer *peer)
1948 if (NULL != peer->tunnel)
1950 peer->tunnel = GCT_new (peer);
1955 * Add a connection to a neighboring peer.
1957 * Store that the peer is the first hop of the connection in one
1958 * direction and that on peer disconnect the connection must be
1959 * notified and destroyed, for it will no longer be valid.
1961 * @param peer Peer to add connection to.
1962 * @param c Connection to add.
1963 * @param pred #GNUNET_YES if we are predecessor, #GNUNET_NO if we are successor
1966 GCP_add_connection (struct CadetPeer *peer,
1967 struct CadetConnection *c,
1970 LOG (GNUNET_ERROR_TYPE_DEBUG,
1971 "adding connection %s\n",
1973 LOG (GNUNET_ERROR_TYPE_DEBUG,
1976 GNUNET_assert (NULL != peer->connections_pred);
1977 GNUNET_assert (NULL != peer->connections_succ);
1978 GNUNET_assert (GNUNET_OK ==
1979 GNUNET_CONTAINER_multihashmap_put ((GNUNET_YES == pred)
1980 ? peer->connections_pred
1981 : peer->connections_succ,
1984 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE));
1985 LOG (GNUNET_ERROR_TYPE_DEBUG,
1986 "Peer %s is now predecessor on %u connections and successor on %u connections.\n",
1988 GNUNET_CONTAINER_multihashmap_size (peer->connections_pred),
1989 GNUNET_CONTAINER_multihashmap_size (peer->connections_succ));
1994 * Add the path to the peer and update the path used to reach it in case this
1997 * @param peer Destination peer to add the path to.
1998 * @param path New path to add. Last peer must be the peer in arg 1.
1999 * Path will be either used of freed if already known.
2000 * @param trusted Do we trust that this path is real?
2002 * @return path if path was taken, pointer to existing duplicate if exists
2005 struct CadetPeerPath *
2006 GCP_add_path (struct CadetPeer *peer, struct CadetPeerPath *path,
2009 struct CadetPeerPath *aux;
2013 LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n",
2014 path->length, GCP_2s (peer));
2016 if (NULL == peer || NULL == path
2017 || path->peers[path->length - 1] != peer->id)
2020 path_destroy (path);
2024 for (l = 1; l < path->length; l++)
2026 if (path->peers[l] == myid)
2028 LOG (GNUNET_ERROR_TYPE_DEBUG, " shortening path by %u\n", l);
2029 for (l2 = 0; l2 < path->length - l; l2++)
2031 path->peers[l2] = path->peers[l + l2];
2035 path->peers = GNUNET_realloc (path->peers,
2036 path->length * sizeof (GNUNET_PEER_Id));
2040 LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length);
2042 if (2 >= path->length && GNUNET_NO == trusted)
2044 /* Only allow CORE to tell us about direct paths */
2045 path_destroy (path);
2049 l = path_get_length (path);
2052 path_destroy (path);
2056 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2057 for (aux = peer->path_head; aux != NULL; aux = aux->next)
2059 l2 = path_get_length (aux);
2062 LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n");
2063 GNUNET_CONTAINER_DLL_insert_before (peer->path_head,
2064 peer->path_tail, aux, path);
2069 if (l2 == l && memcmp (path->peers, aux->peers, l) == 0)
2071 LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n");
2072 path_destroy (path);
2077 GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail,
2079 LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n");
2082 if (NULL != peer->tunnel
2083 && CONNECTIONS_PER_TUNNEL < GCT_count_connections (peer->tunnel))
2092 * Add the path to the origin peer and update the path used to reach it in case
2093 * this is the shortest.
2094 * The path is given in peer_info -> destination, therefore we turn the path
2095 * upside down first.
2097 * @param peer Peer to add the path to, being the origin of the path.
2098 * @param path New path to add after being inversed.
2099 * Path will be either used or freed.
2100 * @param trusted Do we trust that this path is real?
2102 * @return path if path was taken, pointer to existing duplicate if exists
2105 struct CadetPeerPath *
2106 GCP_add_path_to_origin (struct CadetPeer *peer,
2107 struct CadetPeerPath *path,
2113 return GCP_add_path (peer, path, trusted);
2118 * Adds a path to the info of all the peers in the path
2120 * @param p Path to process.
2121 * @param confirmed Whether we know if the path works or not.
2124 GCP_add_path_to_all (const struct CadetPeerPath *p, int confirmed)
2128 /* TODO: invert and add */
2129 for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ;
2130 for (i++; i < p->length; i++)
2132 struct CadetPeer *aux;
2133 struct CadetPeerPath *copy;
2135 aux = GCP_get_short (p->peers[i]);
2136 copy = path_duplicate (p);
2137 copy->length = i + 1;
2138 GCP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed);
2144 * Remove any path to the peer that has the extact same peers as the one given.
2146 * @param peer Peer to remove the path from.
2147 * @param path Path to remove. Is always destroyed .
2150 GCP_remove_path (struct CadetPeer *peer, struct CadetPeerPath *path)
2152 struct CadetPeerPath *iter;
2153 struct CadetPeerPath *next;
2155 GNUNET_assert (myid == path->peers[0]);
2156 GNUNET_assert (peer->id == path->peers[path->length - 1]);
2158 LOG (GNUNET_ERROR_TYPE_INFO,
2159 "Removing path %p (%u) from %s\n",
2164 for (iter = peer->path_head; NULL != iter; iter = next)
2167 if (0 == path_cmp (path, iter))
2169 GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter);
2171 path_destroy (iter);
2174 path_destroy (path);
2179 * Remove a connection from a neighboring peer.
2181 * @param peer Peer to remove connection from.
2182 * @param c Connection to remove.
2183 * @param pred #GNUNET_YES if we were predecessor, #GNUNET_NO if we were successor
2186 GCP_remove_connection (struct CadetPeer *peer,
2187 const struct CadetConnection *c,
2190 LOG (GNUNET_ERROR_TYPE_DEBUG,
2191 "removing connection %s\n",
2193 LOG (GNUNET_ERROR_TYPE_DEBUG,
2196 if ( (NULL == peer) ||
2197 (NULL == peer->connections_pred) ||
2198 (NULL == peer->connections_succ) )
2200 (void) GNUNET_CONTAINER_multihashmap_remove ((GNUNET_YES == pred)
2201 ? peer->connections_pred
2202 : peer->connections_succ,
2205 LOG (GNUNET_ERROR_TYPE_DEBUG,
2206 "Peer %s remains predecessor for %u and successor for %u connections.\n",
2208 GNUNET_CONTAINER_multihashmap_size (peer->connections_pred),
2209 GNUNET_CONTAINER_multihashmap_size (peer->connections_succ));
2214 * Start the DHT search for new paths towards the peer: we don't have
2215 * enough good connections.
2217 * @param peer Destination peer.
2220 GCP_start_search (struct CadetPeer *peer)
2222 const struct GNUNET_PeerIdentity *id;
2223 struct CadetTunnel *t = peer->tunnel;
2225 if (NULL != peer->search_h)
2231 if (NULL != peer->search_delayed)
2232 GCP_stop_search (peer);
2234 id = GNUNET_PEER_resolve2 (peer->id);
2235 peer->search_h = GCD_search (id, &search_handler, peer);
2239 /* Why would we search for a peer with no tunnel towards it? */
2244 if (CADET_TUNNEL_NEW == GCT_get_cstate (t)
2245 || 0 == GCT_count_any_connections (t))
2247 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
2253 * Stop the DHT search for new paths towards the peer: we already have
2254 * enough good connections.
2256 * @param peer Destination peer.
2259 GCP_stop_search (struct CadetPeer *peer)
2261 if (NULL != peer->search_h)
2263 GCD_search_stop (peer->search_h);
2264 peer->search_h = NULL;
2266 if (NULL != peer->search_delayed)
2268 GNUNET_SCHEDULER_cancel (peer->search_delayed);
2269 peer->search_delayed = NULL;
2275 * Get the Full ID of a peer.
2277 * @param peer Peer to get from.
2279 * @return Full ID of peer.
2281 const struct GNUNET_PeerIdentity *
2282 GCP_get_id (const struct CadetPeer *peer)
2284 return GNUNET_PEER_resolve2 (peer->id);
2289 * Get the Short ID of a peer.
2291 * @param peer Peer to get from.
2293 * @return Short ID of peer.
2296 GCP_get_short_id (const struct CadetPeer *peer)
2305 * If tunnel is NULL and there was a search active, stop it, as it's useless.
2311 GCP_set_tunnel (struct CadetPeer *peer, struct CadetTunnel *t)
2314 if (NULL == t && GNUNET_YES == is_searching (peer))
2316 GCP_stop_search (peer);
2322 * Get the tunnel towards a peer.
2324 * @param peer Peer to get from.
2326 * @return Tunnel towards peer.
2328 struct CadetTunnel *
2329 GCP_get_tunnel (const struct CadetPeer *peer)
2331 return peer->tunnel;
2336 * Set the hello message.
2338 * @param peer Peer whose message to set.
2339 * @param hello Hello message.
2342 GCP_set_hello (struct CadetPeer *peer, const struct GNUNET_HELLO_Message *hello)
2344 struct GNUNET_HELLO_Message *old;
2347 LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GCP_2s (peer));
2351 old = GCP_get_hello (peer);
2354 size = GNUNET_HELLO_size (hello);
2355 LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size);
2356 peer->hello = GNUNET_malloc (size);
2357 memcpy (peer->hello, hello, size);
2361 peer->hello = GNUNET_HELLO_merge (old, hello);
2362 LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n",
2363 peer->hello, GNUNET_HELLO_size (hello));
2370 * Get the hello message.
2372 * @param peer Peer whose message to get.
2374 * @return Hello message.
2376 struct GNUNET_HELLO_Message *
2377 GCP_get_hello (struct CadetPeer *peer)
2379 struct GNUNET_TIME_Absolute expiration;
2380 struct GNUNET_TIME_Relative remaining;
2382 if (NULL == peer->hello)
2385 expiration = GNUNET_HELLO_get_last_expiration (peer->hello);
2386 remaining = GNUNET_TIME_absolute_get_remaining (expiration);
2387 if (0 == remaining.rel_value_us)
2389 LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n",
2390 GNUNET_STRINGS_absolute_time_to_string (expiration));
2391 GNUNET_free (peer->hello);
2399 * Try to connect to a peer on TRANSPORT level.
2401 * @param peer Peer to whom to connect.
2404 GCP_try_connect (struct CadetPeer *peer)
2406 struct GNUNET_HELLO_Message *hello;
2407 struct GNUNET_MessageHeader *mh;
2409 if (NULL == transport_handle)
2412 hello = GCP_get_hello (peer);
2416 mh = GNUNET_HELLO_get_header (hello);
2417 GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer);
2422 * Notify a peer that a link between two other peers is broken. If any path
2423 * used that link, eliminate it.
2425 * @param peer Peer affected by the change.
2426 * @param peer1 Peer whose link is broken.
2427 * @param peer2 Peer whose link is broken.
2430 GCP_notify_broken_link (struct CadetPeer *peer,
2431 struct GNUNET_PeerIdentity *peer1,
2432 struct GNUNET_PeerIdentity *peer2)
2434 struct CadetPeerPath *iter;
2435 struct CadetPeerPath *next;
2440 p1 = GNUNET_PEER_search (peer1);
2441 p2 = GNUNET_PEER_search (peer2);
2443 LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2);
2444 if (0 == p1 || 0 == p2)
2446 /* We don't even know them */
2450 for (iter = peer->path_head; NULL != iter; iter = next)
2453 for (i = 0; i < iter->length - 1; i++)
2455 if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2)
2456 || (iter->peers[i] == p2 && iter->peers[i + 1] == p1))
2461 LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s);
2464 path_invalidate (iter);
2472 * Count the number of known paths toward the peer.
2474 * @param peer Peer to get path info.
2476 * @return Number of known paths.
2479 GCP_count_paths (const struct CadetPeer *peer)
2481 struct CadetPeerPath *iter;
2484 for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next)
2492 * Iterate all known peers.
2494 * @param iter Iterator.
2495 * @param cls Closure for @c iter.
2498 GCP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter,
2501 GNUNET_CONTAINER_multipeermap_iterate (peers,
2508 * Get the static string for a peer ID.
2512 * @return Static string for it's ID.
2515 GCP_2s (const struct CadetPeer *peer)
2519 return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id));