2 This file is part of GNUnet.
3 (C) 2013 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.
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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.
22 * @file dv/gnunet-service-dv.c
23 * @brief the distance vector service, primarily handles gossip of nearby
24 * peers and sending/receiving DV messages from core and decapsulating
27 * @author Christian Grothoff
28 * @author Nathan Evans
31 #include "gnunet_util_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_core_service.h"
34 #include "gnunet_hello_lib.h"
35 #include "gnunet_peerinfo_service.h"
36 #include "gnunet_statistics_service.h"
37 #include "gnunet_set_service.h"
38 #include "gnunet_ats_service.h"
44 * How often do we establish the consensu?
46 #define GNUNET_DV_CONSENSUS_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 5)
49 * Maximum number of messages we queue per peer.
51 #define MAX_QUEUE_SIZE 16
54 * Maximum number of messages we queue towards the clients/plugin.
56 #define MAX_QUEUE_SIZE_PLUGIN 1024
59 * The default fisheye depth, from how many hops away will
62 #define DEFAULT_FISHEYE_DEPTH 3
65 * How many hops is a direct neighbor away?
67 #define DIRECT_NEIGHBOR_COST 1
70 GNUNET_NETWORK_STRUCT_BEGIN
73 * Information about a peer DV can route to. These entries are what
74 * we use as the binary format to establish consensus to create our
75 * routing table and as the address format in the HELLOs.
81 * Identity of the peer we can reach.
83 struct GNUNET_PeerIdentity peer;
86 * How many hops (1-3) is this peer away? in network byte order
88 uint32_t distance GNUNET_PACKED;
94 * Message exchanged between DV services (via core), requesting a
95 * message to be routed.
100 * Type: GNUNET_MESSAGE_TYPE_DV_ROUTE
102 struct GNUNET_MessageHeader header;
105 * Expected (remaining) distance. Must be always smaller than
106 * DEFAULT_FISHEYE_DEPTH, should be zero at the target. Must
107 * be decremented by one at each hop. Peers must not forward
108 * these messages further once the counter has reached zero.
110 uint32_t distance GNUNET_PACKED;
113 * The (actual) target of the message (this peer, if distance is zero).
115 struct GNUNET_PeerIdentity target;
118 * The (actual) sender of the message.
120 struct GNUNET_PeerIdentity sender;
124 GNUNET_NETWORK_STRUCT_END
128 * Linked list of messages to send to clients.
130 struct PendingMessage
133 * Pointer to next item in the list
135 struct PendingMessage *next;
138 * Pointer to previous item in the list
140 struct PendingMessage *prev;
143 * Actual message to be sent, allocated after this struct.
145 const struct GNUNET_MessageHeader *msg;
148 * Ultimate target for the message.
150 struct GNUNET_PeerIdentity ultimate_target;
153 * Unique ID of the message.
161 * Information about a direct neighbor (core-level, excluding
162 * DV-links, only DV-enabled peers).
164 struct DirectNeighbor
168 * Identity of the peer.
170 struct GNUNET_PeerIdentity peer;
173 * Session ID we use whenever we create a set union with
174 * this neighbor; constructed from the XOR of our peer
175 * IDs and then salted with "DV-SALT" to avoid conflicts
176 * with other applications.
178 struct GNUNET_HashCode real_session_id;
181 * Head of linked list of messages to send to this peer.
183 struct PendingMessage *pm_head;
186 * Tail of linked list of messages to send to this peer.
188 struct PendingMessage *pm_tail;
191 * Transmit handle to core service.
193 struct GNUNET_CORE_TransmitHandle *cth;
196 * Routing table of the neighbor, NULL if not yet established.
197 * Keys are peer identities, values are 'struct Target' entries.
198 * Note that the distances in the targets are from the point-of-view
199 * of the peer, not from us!
201 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table;
204 * Updated routing table of the neighbor, under construction,
205 * NULL if we are not currently building it.
206 * Keys are peer identities, values are 'struct Target' entries.
207 * Note that the distances in the targets are from the point-of-view
208 * of the peer, not from us!
210 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table_consensus;
213 * Our current (exposed) routing table as a set.
215 struct GNUNET_SET_Handle *my_set;
218 * Handle for our current active set union operation.
220 struct GNUNET_SET_OperationHandle *set_op;
223 * Handle used if we are listening for this peer, waiting for the
224 * other peer to initiate construction of the set union. NULL if
225 * we ar the initiating peer.
227 struct GNUNET_SET_ListenHandle *listen_handle;
230 * ID of the task we use to (periodically) update our consensus
231 * with this peer. Used if we are the initiating peer.
233 GNUNET_SCHEDULER_TaskIdentifier initiate_task;
236 * At what offset are we, with respect to inserting our own routes
237 * into the consensus?
239 unsigned int consensus_insertion_offset;
242 * At what distance are we, with respect to inserting our own routes
243 * into the consensus?
245 unsigned int consensus_insertion_distance;
248 * Number of messages currently in the 'pm_XXXX'-DLL.
250 unsigned int pm_queue_size;
252 unsigned int consensus_elements;
255 * Flag set within 'check_target_removed' to trigger full global route refresh.
260 * Our distance to this peer, 0 for unknown.
265 * Is this neighbor connected at the core level?
273 * A route includes information about the next hop,
274 * the target, and the ultimate distance to the
281 * Which peer do we need to forward the message to?
283 struct DirectNeighbor *next_hop;
286 * What would be the target, and how far is it away?
288 struct Target target;
291 * Offset of this target in the respective consensus set.
293 unsigned int set_offset;
299 * Set of targets we bring to a consensus; all targets in a set have a
300 * distance equal to the sets distance (which is implied by the array
307 * Array of targets in the set, may include NULL entries if a
308 * neighbor has disconnected; the targets are allocated with the
309 * respective container (all_routes), not here.
311 struct Route **targets;
314 * Size of the 'targets' array.
316 unsigned int array_length;
322 * Peermap of all of our neighbors; processing these usually requires
323 * first checking to see if the peer is core-connected and if the
324 * distance is 1, in which case they are direct neighbors.
326 static struct GNUNET_CONTAINER_MultiPeerMap *direct_neighbors;
329 * Hashmap with all routes that we currently support; contains
330 * routing information for all peers from distance 2
331 * up to distance DEFAULT_FISHEYE_DEPTH.
333 static struct GNUNET_CONTAINER_MultiPeerMap *all_routes;
336 * Array of consensus sets we expose to the outside world. Sets
337 * are structured by the distance to the target.
339 static struct ConsensusSet consensi[DEFAULT_FISHEYE_DEPTH - 1];
342 * Handle to the core service api.
344 static struct GNUNET_CORE_Handle *core_api;
347 * The identity of our peer.
349 static struct GNUNET_PeerIdentity my_identity;
352 * The configuration for this service.
354 static const struct GNUNET_CONFIGURATION_Handle *cfg;
357 * The client, the DV plugin connected to us (or an event monitor).
358 * Hopefully this client will never change, although if the plugin
359 * dies and returns for some reason it may happen.
361 static struct GNUNET_SERVER_NotificationContext *nc;
364 * Handle for the statistics service.
366 static struct GNUNET_STATISTICS_Handle *stats;
369 * Handle to ATS service.
371 static struct GNUNET_ATS_PerformanceHandle *ats;
375 * Start creating a new DV set union by initiating the connection.
377 * @param cls the 'struct DirectNeighbor' of the peer we're building
378 * a routing consensus with
379 * @param tc scheduler context
382 initiate_set_union (void *cls,
383 const struct GNUNET_SCHEDULER_TaskContext *tc);
387 * Start creating a new DV set union construction, our neighbour has
388 * asked for it (callback for listening peer).
390 * @param cls the 'struct DirectNeighbor' of the peer we're building
391 * a routing consensus with
392 * @param other_peer the other peer
393 * @param context_msg message with application specific information from
395 * @param request request from the other peer, use GNUNET_SET_accept
396 * to accept it, otherwise the request will be refused
397 * Note that we don't use a return value here, as it is also
398 * necessary to specify the set we want to do the operation with,
399 * whith sometimes can be derived from the context message.
400 * Also necessary to specify the timeout.
403 listen_set_union (void *cls,
404 const struct GNUNET_PeerIdentity *other_peer,
405 const struct GNUNET_MessageHeader *context_msg,
406 struct GNUNET_SET_Request *request);
410 * Forward a message from another peer to the plugin.
412 * @param message the message to send to the plugin
413 * @param origin the original sender of the message
414 * @param distance distance to the original sender of the message
417 send_data_to_plugin (const struct GNUNET_MessageHeader *message,
418 const struct GNUNET_PeerIdentity *origin,
421 struct GNUNET_DV_ReceivedMessage *received_msg;
424 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
425 "Delivering message from peer `%s'\n",
426 GNUNET_i2s (origin));
427 size = sizeof (struct GNUNET_DV_ReceivedMessage) +
428 ntohs (message->size);
429 if (size >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
431 GNUNET_break (0); /* too big */
434 received_msg = GNUNET_malloc (size);
435 received_msg->header.size = htons (size);
436 received_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DV_RECV);
437 received_msg->distance = htonl (distance);
438 received_msg->sender = *origin;
439 memcpy (&received_msg[1], message, ntohs (message->size));
440 GNUNET_SERVER_notification_context_broadcast (nc,
441 &received_msg->header,
443 GNUNET_free (received_msg);
448 * Forward a control message to the plugin.
450 * @param message the message to send to the plugin
453 send_control_to_plugin (const struct GNUNET_MessageHeader *message)
455 GNUNET_SERVER_notification_context_broadcast (nc,
462 * Give an (N)ACK message to the plugin, we transmitted a message for it.
464 * @param target peer that received the message
465 * @param uid plugin-chosen UID for the message
466 * @param nack GNUNET_NO to send ACK, GNUNET_YES to send NACK
469 send_ack_to_plugin (const struct GNUNET_PeerIdentity *target,
473 struct GNUNET_DV_AckMessage ack_msg;
475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
476 "Delivering ACK for message to peer `%s'\n",
477 GNUNET_i2s (target));
478 ack_msg.header.size = htons (sizeof (ack_msg));
479 ack_msg.header.type = htons ((GNUNET_YES == nack)
480 ? GNUNET_MESSAGE_TYPE_DV_SEND_NACK
481 : GNUNET_MESSAGE_TYPE_DV_SEND_ACK);
482 ack_msg.uid = htonl (uid);
483 ack_msg.target = *target;
484 send_control_to_plugin (&ack_msg.header);
489 * Send a DISTANCE_CHANGED message to the plugin.
491 * @param peer peer with a changed distance
492 * @param distance new distance to the peer
495 send_distance_change_to_plugin (const struct GNUNET_PeerIdentity *peer,
498 struct GNUNET_DV_DistanceUpdateMessage du_msg;
500 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
501 "Delivering DISTANCE_CHANGED for message about peer `%s'\n",
503 du_msg.header.size = htons (sizeof (du_msg));
504 du_msg.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISTANCE_CHANGED);
505 du_msg.distance = htonl (distance);
507 send_control_to_plugin (&du_msg.header);
512 * Give a CONNECT message to the plugin.
514 * @param target peer that connected
515 * @param distance distance to the target
518 send_connect_to_plugin (const struct GNUNET_PeerIdentity *target,
521 struct GNUNET_DV_ConnectMessage cm;
523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
524 "Delivering CONNECT about peer `%s'\n",
525 GNUNET_i2s (target));
526 cm.header.size = htons (sizeof (cm));
527 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
528 cm.distance = htonl (distance);
530 send_control_to_plugin (&cm.header);
535 * Give a DISCONNECT message to the plugin.
537 * @param target peer that disconnected
540 send_disconnect_to_plugin (const struct GNUNET_PeerIdentity *target)
542 struct GNUNET_DV_DisconnectMessage dm;
544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
545 "Delivering DISCONNECT about peer `%s'\n",
546 GNUNET_i2s (target));
547 dm.header.size = htons (sizeof (dm));
548 dm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
549 dm.reserved = htonl (0);
551 send_control_to_plugin (&dm.header);
556 * Function called to transfer a message to another peer
559 * @param cls closure with the direct neighbor
560 * @param size number of bytes available in buf
561 * @param buf where the callee should write the message
562 * @return number of bytes written to buf
565 core_transmit_notify (void *cls, size_t size, void *buf)
567 struct DirectNeighbor *dn = cls;
569 struct PendingMessage *pending;
576 /* peer disconnected */
580 pending = dn->pm_head;
582 while ( (NULL != (pending = dn->pm_head)) &&
583 (size >= off + (msize = ntohs (pending->msg->size))))
586 GNUNET_CONTAINER_DLL_remove (dn->pm_head,
589 memcpy (&cbuf[off], pending->msg, msize);
590 if (0 != pending->uid)
591 send_ack_to_plugin (&pending->ultimate_target,
594 GNUNET_free (pending);
597 if (NULL != dn->pm_head)
599 GNUNET_CORE_notify_transmit_ready (core_api,
600 GNUNET_YES /* cork */,
602 GNUNET_TIME_UNIT_FOREVER_REL,
605 &core_transmit_notify, dn);
611 * Forward the given payload to the given target.
613 * @param target where to send the message
614 * @param uid unique ID for the message
615 * @param ultimate_target ultimate recipient for the message
616 * @param distance expected (remaining) distance to the target
617 * @param sender original sender of the message
618 * @param payload payload of the message
621 forward_payload (struct DirectNeighbor *target,
624 const struct GNUNET_PeerIdentity *sender,
625 const struct GNUNET_PeerIdentity *ultimate_target,
626 const struct GNUNET_MessageHeader *payload)
628 struct PendingMessage *pm;
629 struct RouteMessage *rm;
632 if ( (target->pm_queue_size >= MAX_QUEUE_SIZE) &&
633 (0 != memcmp (sender,
635 sizeof (struct GNUNET_PeerIdentity))) )
637 GNUNET_break (0 == uid);
640 msize = sizeof (struct RouteMessage) + ntohs (payload->size);
641 if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
646 pm = GNUNET_malloc (sizeof (struct PendingMessage) + msize);
647 pm->ultimate_target = *ultimate_target;
649 pm->msg = (const struct GNUNET_MessageHeader *) &pm[1];
650 rm = (struct RouteMessage *) &pm[1];
651 rm->header.size = htons ((uint16_t) msize);
652 rm->header.type = htons (GNUNET_MESSAGE_TYPE_DV_ROUTE);
653 rm->distance = htonl (distance);
654 rm->target = target->peer;
655 rm->sender = *sender;
656 memcpy (&rm[1], payload, ntohs (payload->size));
657 GNUNET_CONTAINER_DLL_insert_tail (target->pm_head,
660 target->pm_queue_size++;
661 if (NULL == target->cth)
662 target->cth = GNUNET_CORE_notify_transmit_ready (core_api,
663 GNUNET_YES /* cork */,
665 GNUNET_TIME_UNIT_FOREVER_REL,
668 &core_transmit_notify, target);
673 * Find a free slot for storing a 'route' in the 'consensi'
674 * set at the given distance.
676 * @param distance distance to use for the set slot
679 get_consensus_slot (uint32_t distance)
681 struct ConsensusSet *cs;
684 cs = &consensi[distance];
686 while ( (i < cs->array_length) &&
687 (NULL != cs->targets[i]) ) i++;
688 if (i == cs->array_length)
690 GNUNET_array_grow (cs->targets,
692 cs->array_length * 2 + 2);
699 * Allocate a slot in the consensus set for a route.
701 * @param route route to initialize
702 * @param distance which consensus set to use
705 allocate_route (struct Route *route,
710 i = get_consensus_slot (distance);
711 route->set_offset = i;
712 consensi[distance].targets[i] = route;
713 route->target.distance = htonl (distance);
718 * Release a slot in the consensus set for a route.
720 * @param route route to release the slot from
723 release_route (struct Route *route)
725 consensi[ntohl (route->target.distance)].targets[route->set_offset] = NULL;
726 route->set_offset = UINT_MAX; /* indicate invalid slot */
731 * Move a route from one consensus set to another.
733 * @param route route to move
734 * @param new_distance new distance for the route (destination set)
737 move_route (struct Route *route,
738 uint32_t new_distance)
742 release_route (route);
743 i = get_consensus_slot (new_distance);
744 route->set_offset = i;
745 consensi[new_distance].targets[i] = route;
746 route->target.distance = htonl (new_distance);
751 * Initialize this neighbors 'my_set' and when done give
752 * it to the pending set operation for execution.
754 * Add a single element to the set per call:
756 * If we reached the last element of a consensus element: increase distance
759 * @param cls the neighbor for which we are building the set
762 build_set (void *cls)
764 struct DirectNeighbor *neighbor = cls;
765 struct GNUNET_SET_Element element;
766 struct Target *target;
769 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
770 (consensi[neighbor->consensus_insertion_distance].array_length == neighbor->consensus_insertion_offset) )
772 /* If we reached the last element of a consensus array element: increase distance and start with next array */
773 neighbor->consensus_insertion_offset = 0;
774 neighbor->consensus_insertion_distance++;
776 /* skip over NULL entries */
777 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
778 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
779 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
780 neighbor->consensus_insertion_offset++;
782 if (DEFAULT_FISHEYE_DEPTH - 1 == neighbor->consensus_insertion_distance)
784 /* we have added all elements to the set, run the operation */
785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
786 "Finished building my SET for peer `%s' with %u elements, committing\n",
787 GNUNET_i2s(&neighbor->peer),
788 neighbor->consensus_elements);
789 GNUNET_SET_commit (neighbor->set_op,
791 GNUNET_SET_destroy (neighbor->my_set);
792 neighbor->my_set = NULL;
796 target = &consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]->target;
797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
798 "Adding peer `%s' with distance %u to SET\n",
799 GNUNET_i2s (&target->peer),
800 ntohl (target->distance));
801 element.size = sizeof (struct Target);
802 element.type = htons (0); /* do we need this? */
803 element.data = target;
804 neighbor->consensus_elements++;
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
806 "Adding element to SET\n");
807 GNUNET_SET_add_element (neighbor->my_set,
809 &build_set, neighbor);
811 /* Find next non-NULL entry */
812 neighbor->consensus_insertion_offset++;
813 /* skip over NULL entries */
814 while ( (DEFAULT_FISHEYE_DEPTH - 1 > neighbor->consensus_insertion_distance) &&
815 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
816 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
817 neighbor->consensus_insertion_offset++;
822 * A peer is now connected to us at distance 1. Initiate DV exchange.
824 * @param neighbor entry for the neighbor at distance 1
827 handle_direct_connect (struct DirectNeighbor *neighbor)
830 struct GNUNET_HashCode h1;
831 struct GNUNET_HashCode h2;
832 struct GNUNET_HashCode session_id;
834 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
835 "Direct connection to %s established, routing table exchange begins.\n",
836 GNUNET_i2s (&neighbor->peer));
837 GNUNET_STATISTICS_update (stats,
838 "# peers connected (1-hop)",
840 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
844 send_disconnect_to_plugin (&neighbor->peer);
845 release_route (route);
849 route = GNUNET_new (struct Route);
850 route->next_hop = neighbor;
851 route->target.peer= neighbor->peer;
852 route->target.distance = DIRECT_NEIGHBOR_COST;
853 allocate_route (route, DIRECT_NEIGHBOR_COST);
855 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
856 "Adding direct route to %s\n",
857 GNUNET_i2s (&route->target.peer));
860 /* construct session ID seed as XOR of both peer's identities */
861 GNUNET_CRYPTO_hash (&my_identity, sizeof (my_identity), &h1);
862 GNUNET_CRYPTO_hash (&neighbor->peer, sizeof (struct GNUNET_PeerIdentity), &h2);
863 GNUNET_CRYPTO_hash_xor (&h1,
866 /* make sure session ID is unique across applications by salting it with 'DV' */
867 GNUNET_CRYPTO_hkdf (&neighbor->real_session_id, sizeof (struct GNUNET_HashCode),
868 GCRY_MD_SHA512, GCRY_MD_SHA256,
870 &session_id, sizeof (session_id),
872 if (0 < memcmp (&neighbor->peer,
874 sizeof (struct GNUNET_PeerIdentity)))
876 neighbor->initiate_task = GNUNET_SCHEDULER_add_now (&initiate_set_union,
881 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
882 "Starting SET listen operation\n");
883 neighbor->listen_handle = GNUNET_SET_listen (cfg,
884 GNUNET_SET_OPERATION_UNION,
885 &neighbor->real_session_id,
893 * Method called whenever a peer connects.
896 * @param peer peer identity this notification is about
899 handle_core_connect (void *cls,
900 const struct GNUNET_PeerIdentity *peer)
902 struct DirectNeighbor *neighbor;
904 /* Check for connect to self message */
905 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
907 /* check if entry exists */
908 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
910 if (NULL != neighbor)
912 GNUNET_break (GNUNET_YES != neighbor->connected);
913 neighbor->connected = GNUNET_YES;
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Core connected to %s (distance %u)\n",
917 (unsigned int) neighbor->distance);
918 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
920 handle_direct_connect (neighbor);
923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
924 "Core connected to %s (distance unknown)\n",
926 neighbor = GNUNET_new (struct DirectNeighbor);
927 neighbor->peer = *peer;
928 GNUNET_assert (GNUNET_YES ==
929 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
932 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
933 neighbor->connected = GNUNET_YES;
934 neighbor->distance = 0; /* unknown */
939 * Called for each 'target' in a neighbor table to free the associated memory.
942 * @param key key of the value
943 * @param value value to free
944 * @return GNUNET_OK to continue to iterate
947 free_targets (void *cls,
948 const struct GNUNET_PeerIdentity *key,
957 * Multipeerhmap iterator for checking if a given route is
958 * (now) useful to this peer.
960 * @param cls the direct neighbor for the given route
961 * @param key key value stored under
962 * @param value a 'struct Target' that may or may not be useful; not that
963 * the distance in 'target' does not include the first hop yet
964 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
967 check_possible_route (void *cls,
968 const struct GNUNET_PeerIdentity *key,
971 struct DirectNeighbor *neighbor = cls;
972 struct Target *target = value;
975 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
979 if (ntohl (route->target.distance) > ntohl (target->distance) + 1)
981 /* this 'target' is cheaper than the existing route; switch to alternative route! */
982 move_route (route, ntohl (target->distance) + 1);
983 route->next_hop = neighbor;
984 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
986 return GNUNET_YES; /* got a route to this target already */
988 route = GNUNET_new (struct Route);
989 route->next_hop = neighbor;
990 route->target.distance = htonl (ntohl (target->distance) + 1);
991 route->target.peer = target->peer;
992 allocate_route (route, ntohl (route->target.distance));
993 GNUNET_assert (GNUNET_YES ==
994 GNUNET_CONTAINER_multipeermap_put (all_routes,
997 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
998 send_connect_to_plugin (&route->target.peer, ntohl (target->distance));
1004 * Multipeermap iterator for finding routes that were previously
1005 * "hidden" due to a better route (called after a disconnect event).
1008 * @param key peer identity of the given direct neighbor
1009 * @param value a 'struct DirectNeighbor' to check for additional routes
1010 * @return GNUNET_YES to continue iteration
1013 refresh_routes (void *cls,
1014 const struct GNUNET_PeerIdentity *key,
1017 struct DirectNeighbor *neighbor = value;
1019 if ( (GNUNET_YES != neighbor->connected) ||
1020 (DIRECT_NEIGHBOR_COST != neighbor->distance) )
1022 if (NULL != neighbor->neighbor_table)
1023 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1024 &check_possible_route,
1031 * Get distance information from 'atsi'.
1033 * @param atsi performance data
1034 * @param atsi_count number of entries in atsi
1035 * @return connected transport distance
1038 get_atsi_distance (const struct GNUNET_ATS_Information *atsi,
1039 uint32_t atsi_count)
1043 for (i = 0; i < atsi_count; i++)
1044 if (ntohl (atsi[i].type) == GNUNET_ATS_QUALITY_NET_DISTANCE)
1045 return (0 == ntohl (atsi->value)) ? DIRECT_NEIGHBOR_COST : ntohl (atsi->value); // FIXME: 0 check should not be required once ATS is fixed!
1046 /* If we do not have explicit distance data, assume direct neighbor. */
1047 return DIRECT_NEIGHBOR_COST;
1052 * Multipeermap iterator for freeing routes that go via a particular
1053 * neighbor that disconnected and is thus no longer available.
1055 * @param cls the direct neighbor that is now unavailable
1056 * @param key key value stored under
1057 * @param value a 'struct Route' that may or may not go via neighbor
1059 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1062 cull_routes (void *cls,
1063 const struct GNUNET_PeerIdentity *key,
1066 struct DirectNeighbor *neighbor = cls;
1067 struct Route *route = value;
1069 if (route->next_hop != neighbor)
1070 return GNUNET_YES; /* not affected */
1071 GNUNET_assert (GNUNET_YES ==
1072 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1073 release_route (route);
1074 send_disconnect_to_plugin (&route->target.peer);
1075 GNUNET_free (route);
1081 * Handle the case that a direct connection to a peer is
1082 * disrupted. Remove all routes via that peer and
1083 * stop the consensus with it.
1085 * @param neighbor peer that was disconnected (or at least is no
1086 * longer at distance 1)
1089 handle_direct_disconnect (struct DirectNeighbor *neighbor)
1091 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1094 if (NULL != neighbor->cth)
1096 GNUNET_CORE_notify_transmit_ready_cancel (neighbor->cth);
1097 neighbor->cth = NULL;
1099 if (NULL != neighbor->neighbor_table_consensus)
1101 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1104 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1105 neighbor->neighbor_table_consensus = NULL;
1107 if (NULL != neighbor->neighbor_table)
1109 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1112 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1113 neighbor->neighbor_table = NULL;
1115 if (NULL != neighbor->set_op)
1117 GNUNET_SET_operation_cancel (neighbor->set_op);
1118 neighbor->set_op = NULL;
1120 if (NULL != neighbor->my_set)
1122 GNUNET_SET_destroy (neighbor->my_set);
1123 neighbor->my_set = NULL;
1125 if (NULL != neighbor->listen_handle)
1127 GNUNET_SET_listen_cancel (neighbor->listen_handle);
1128 neighbor->listen_handle = NULL;
1130 if (GNUNET_SCHEDULER_NO_TASK != neighbor->initiate_task)
1132 GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
1133 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1139 * Function that is called with QoS information about an address; used
1140 * to update our current distance to another peer.
1142 * @param cls closure
1143 * @param address the address
1144 * @param active is this address in active use
1145 * @param bandwidth_out assigned outbound bandwidth for the connection
1146 * @param bandwidth_in assigned inbound bandwidth for the connection
1147 * @param ats performance data for the address (as far as known)
1148 * @param ats_count number of performance records in 'ats'
1151 handle_ats_update (void *cls,
1152 const struct GNUNET_HELLO_Address *address,
1154 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1155 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1156 const struct GNUNET_ATS_Information *ats,
1159 struct DirectNeighbor *neighbor;
1162 if (GNUNET_NO == active)
1164 distance = get_atsi_distance (ats, ats_count);
1166 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1167 "ATS says distance to %s is %u\n",
1168 GNUNET_i2s (&address->peer),
1169 (unsigned int) distance);*/
1170 /* check if entry exists */
1171 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1173 if (NULL != neighbor)
1175 if ( (DIRECT_NEIGHBOR_COST == neighbor->distance) &&
1176 (DIRECT_NEIGHBOR_COST == distance) )
1177 return; /* no change */
1178 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1180 neighbor->distance = distance;
1181 GNUNET_STATISTICS_update (stats,
1182 "# peers connected (1-hop)",
1184 handle_direct_disconnect (neighbor);
1185 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1190 neighbor->distance = distance;
1191 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
1193 if (GNUNET_YES != neighbor->connected)
1195 handle_direct_connect (neighbor);
1198 neighbor = GNUNET_new (struct DirectNeighbor);
1199 neighbor->peer = address->peer;
1200 GNUNET_assert (GNUNET_YES ==
1201 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
1204 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1205 neighbor->connected = GNUNET_NO; /* not yet */
1206 neighbor->distance = distance;
1211 * Check if a target was removed from the set of the other peer; if so,
1212 * if we also used it for our route, we need to remove it from our
1213 * 'all_routes' set (and later check if an alternative path now exists).
1215 * @param cls the 'struct DirectNeighbor'
1216 * @param key peer identity for the target
1217 * @param value a 'struct Target' previously reachable via the given neighbor
1220 check_target_removed (void *cls,
1221 const struct GNUNET_PeerIdentity *key,
1224 struct DirectNeighbor *neighbor = cls;
1225 struct Target *new_target;
1226 struct Route *current_route;
1228 new_target = GNUNET_CONTAINER_multipeermap_get (neighbor->neighbor_table_consensus,
1230 if (NULL == new_target)
1232 /* target was revoked, check if it was used */
1233 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1235 if ( (NULL == current_route) ||
1236 (current_route->next_hop != neighbor) )
1238 /* didn't matter, wasn't used */
1241 /* remove existing route */
1242 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1243 "Lost route to %s\n",
1244 GNUNET_i2s (¤t_route->target.peer));
1245 GNUNET_assert (GNUNET_YES ==
1246 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, current_route));
1247 send_disconnect_to_plugin (¤t_route->target.peer);
1248 GNUNET_free (current_route);
1249 neighbor->target_removed = GNUNET_YES;
1257 * Check if a target was added to the set of the other peer; if it
1258 * was added or impoves the existing route, do the needed updates.
1260 * @param cls the 'struct DirectNeighbor'
1261 * @param key peer identity for the target
1262 * @param value a 'struct Target' now reachable via the given neighbor
1265 check_target_added (void *cls,
1266 const struct GNUNET_PeerIdentity *key,
1269 struct DirectNeighbor *neighbor = cls;
1270 struct Target *target = value;
1271 struct Route *current_route;
1273 /* target was revoked, check if it was used */
1274 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1276 if (NULL != current_route)
1279 if (current_route->next_hop == neighbor)
1281 /* we had the same route before, no change */
1282 if (ntohl (target->distance) + 1 != ntohl (current_route->target.distance))
1284 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1285 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
1289 if (ntohl (current_route->target.distance) >= ntohl (target->distance) + 1)
1291 /* alternative, shorter route exists, ignore */
1294 /* new route is better than the existing one, take over! */
1295 /* NOTE: minor security issue: malicious peers may advertise
1296 very short routes to take over longer paths; as we don't
1297 check that the shorter routes actually work, a malicious
1298 direct neighbor can use this to DoS our long routes */
1299 current_route->next_hop = neighbor;
1300 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1301 send_distance_change_to_plugin (&target->peer, ntohl (target->distance) + 1);
1305 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1306 "Discovered new route to %s using %u hops\n",
1307 GNUNET_i2s (&target->peer),
1308 (unsigned int) (ntohl (target->distance) + 1));
1309 current_route = GNUNET_new (struct Route);
1310 current_route->next_hop = neighbor;
1311 current_route->target.peer = target->peer;
1312 current_route->target.distance = htonl (ntohl (target->distance) + 1);
1313 GNUNET_assert (GNUNET_YES ==
1314 GNUNET_CONTAINER_multipeermap_put (all_routes,
1315 ¤t_route->target.peer,
1317 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1318 send_connect_to_plugin (¤t_route->target.peer,
1319 ntohl (current_route->target.distance));
1325 * Callback for set operation results. Called for each element
1326 * in the result set.
1327 * We have learned a new route from the other peer. Add it to the
1328 * route set we're building.
1330 * @param cls the 'struct DirectNeighbor' we're building the consensus with
1331 * @param element a result element, only valid if status is GNUNET_SET_STATUS_OK
1332 * @param status see enum GNUNET_SET_Status
1335 handle_set_union_result (void *cls,
1336 const struct GNUNET_SET_Element *element,
1337 enum GNUNET_SET_Status status)
1339 struct DirectNeighbor *neighbor = cls;
1340 struct Target *target;
1342 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1343 "Got SET union result: %d\n",
1347 case GNUNET_SET_STATUS_OK:
1348 if (sizeof (struct Target) != element->size)
1350 GNUNET_break_op (0);
1353 target = GNUNET_new (struct Target);
1354 memcpy (target, element->data, sizeof (struct Target));
1356 GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table_consensus,
1359 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1361 GNUNET_break_op (0);
1362 GNUNET_free (target);
1365 case GNUNET_SET_STATUS_TIMEOUT:
1366 case GNUNET_SET_STATUS_FAILURE:
1367 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1368 "Failed to establish DV union, will try again later\n");
1369 neighbor->set_op = NULL;
1370 if (NULL != neighbor->neighbor_table_consensus)
1372 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1375 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1376 neighbor->neighbor_table_consensus = NULL;
1378 if (0 < memcmp (&neighbor->peer,
1380 sizeof (struct GNUNET_PeerIdentity)))
1381 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1382 &initiate_set_union,
1385 case GNUNET_SET_STATUS_HALF_DONE:
1386 /* we got all of our updates; integrate routing table! */
1387 neighbor->target_removed = GNUNET_NO;
1388 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1389 &check_target_removed,
1391 if (GNUNET_YES == neighbor->target_removed)
1393 /* check if we got an alternative for the removed routes */
1394 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1398 /* add targets that appeared (and check for improved routes) */
1399 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1400 &check_target_added,
1402 if (NULL != neighbor->neighbor_table)
1404 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1407 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1408 neighbor->neighbor_table = NULL;
1410 neighbor->neighbor_table = neighbor->neighbor_table_consensus;
1411 neighbor->neighbor_table_consensus = NULL;
1413 case GNUNET_SET_STATUS_DONE:
1414 /* operation done, schedule next run! */
1415 neighbor->set_op = NULL;
1416 if (0 < memcmp (&neighbor->peer,
1418 sizeof (struct GNUNET_PeerIdentity)))
1419 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1420 &initiate_set_union,
1431 * Start creating a new DV set union construction, our neighbour has
1432 * asked for it (callback for listening peer).
1434 * @param cls the 'struct DirectNeighbor' of the peer we're building
1435 * a routing consensus with
1436 * @param other_peer the other peer
1437 * @param context_msg message with application specific information from
1439 * @param request request from the other peer, use GNUNET_SET_accept
1440 * to accept it, otherwise the request will be refused
1441 * Note that we don't use a return value here, as it is also
1442 * necessary to specify the set we want to do the operation with,
1443 * whith sometimes can be derived from the context message.
1444 * Also necessary to specify the timeout.
1447 listen_set_union (void *cls,
1448 const struct GNUNET_PeerIdentity *other_peer,
1449 const struct GNUNET_MessageHeader *context_msg,
1450 struct GNUNET_SET_Request *request)
1452 struct DirectNeighbor *neighbor = cls;
1454 if (NULL == request)
1455 return; /* why??? */
1456 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1457 "Starting to create consensus with %s!\n",
1458 GNUNET_i2s (&neighbor->peer));
1459 if (NULL != neighbor->set_op)
1461 GNUNET_SET_operation_cancel (neighbor->set_op);
1462 neighbor->set_op = NULL;
1464 if (NULL != neighbor->my_set)
1466 GNUNET_SET_destroy (neighbor->my_set);
1467 neighbor->my_set = NULL;
1469 neighbor->my_set = GNUNET_SET_create (cfg,
1470 GNUNET_SET_OPERATION_UNION);
1471 neighbor->set_op = GNUNET_SET_accept (request,
1472 GNUNET_SET_RESULT_ADDED,
1473 &handle_set_union_result,
1475 neighbor->consensus_insertion_offset = 0;
1476 neighbor->consensus_insertion_distance = 0;
1477 neighbor->consensus_elements = 0;
1478 build_set (neighbor);
1483 * Start creating a new DV set union by initiating the connection.
1485 * @param cls the 'struct DirectNeighbor' of the peer we're building
1486 * a routing consensus with
1487 * @param tc scheduler context
1490 initiate_set_union (void *cls,
1491 const struct GNUNET_SCHEDULER_TaskContext *tc)
1493 struct DirectNeighbor *neighbor = cls;
1495 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1496 "Initiating SET union\n");
1497 neighbor->initiate_task = GNUNET_SCHEDULER_NO_TASK;
1498 neighbor->my_set = GNUNET_SET_create (cfg,
1499 GNUNET_SET_OPERATION_UNION);
1500 neighbor->set_op = GNUNET_SET_prepare (&neighbor->peer,
1501 &neighbor->real_session_id,
1503 0 /* FIXME: salt */,
1504 GNUNET_SET_RESULT_ADDED,
1505 &handle_set_union_result,
1507 neighbor->consensus_insertion_offset = 0;
1508 neighbor->consensus_insertion_distance = 0;
1509 neighbor->consensus_elements = 0;
1510 build_set (neighbor);
1515 * Core handler for DV data messages. Whatever this message
1516 * contains all we really have to do is rip it out of its
1517 * DV layering and give it to our pal the DV plugin to report
1520 * @param cls closure
1521 * @param peer peer which sent the message (immediate sender)
1522 * @param message the message
1523 * @return GNUNET_OK on success, GNUNET_SYSERR if the other peer violated the protocol
1526 handle_dv_route_message (void *cls, const struct GNUNET_PeerIdentity *peer,
1527 const struct GNUNET_MessageHeader *message)
1529 const struct RouteMessage *rm;
1530 const struct GNUNET_MessageHeader *payload;
1531 struct Route *route;
1533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1534 "Handling DV message\n");
1535 if (ntohs (message->size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
1537 GNUNET_break_op (0);
1538 return GNUNET_SYSERR;
1540 rm = (const struct RouteMessage *) message;
1541 payload = (const struct GNUNET_MessageHeader *) &rm[1];
1542 if (ntohs (message->size) != sizeof (struct RouteMessage) + ntohs (payload->size))
1544 GNUNET_break_op (0);
1545 return GNUNET_SYSERR;
1547 if (0 == memcmp (&rm->target,
1549 sizeof (struct GNUNET_PeerIdentity)))
1551 /* message is for me, check reverse route! */
1552 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1556 /* don't have reverse route, drop */
1557 GNUNET_STATISTICS_update (stats,
1558 "# message discarded (no reverse route)",
1562 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1563 "Delivering %u bytes to myself!\n",
1564 ntohs (payload->size));
1565 send_data_to_plugin (payload,
1567 ntohl (route->target.distance));
1570 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1574 GNUNET_STATISTICS_update (stats,
1575 "# messages discarded (no route)",
1579 if (ntohl (route->target.distance) > ntohl (rm->distance) + 1)
1581 GNUNET_STATISTICS_update (stats,
1582 "# messages discarded (target too far)",
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1587 "Forwarding message to %s\n",
1588 GNUNET_i2s (&rm->target));
1589 forward_payload (route->next_hop,
1590 ntohl (route->target.distance),
1600 * Service server's handler for message send requests (which come
1601 * bubbling up to us through the DV plugin).
1603 * @param cls closure
1604 * @param client identification of the client
1605 * @param message the actual message
1608 handle_dv_send_message (void *cls, struct GNUNET_SERVER_Client *client,
1609 const struct GNUNET_MessageHeader *message)
1611 struct Route *route;
1612 const struct GNUNET_DV_SendMessage *msg;
1613 const struct GNUNET_MessageHeader *payload;
1615 if (ntohs (message->size) < sizeof (struct GNUNET_DV_SendMessage) + sizeof (struct GNUNET_MessageHeader))
1618 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1621 msg = (const struct GNUNET_DV_SendMessage *) message;
1622 GNUNET_break (0 != ntohl (msg->uid));
1623 payload = (const struct GNUNET_MessageHeader *) &msg[1];
1624 if (ntohs (message->size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
1627 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
1630 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1634 /* got disconnected */
1635 GNUNET_STATISTICS_update (stats,
1636 "# local messages discarded (no route)",
1638 send_ack_to_plugin (&msg->target, ntohl (msg->uid), GNUNET_YES);
1639 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Forwarding %u bytes to %s\n",
1644 ntohs (payload->size),
1645 GNUNET_i2s (&msg->target));
1647 forward_payload (route->next_hop,
1648 ntohl (route->target.distance),
1653 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1658 * Cleanup all of the data structures associated with a given neighbor.
1660 * @param neighbor neighbor to clean up
1663 cleanup_neighbor (struct DirectNeighbor *neighbor)
1665 struct PendingMessage *pending;
1667 while (NULL != (pending = neighbor->pm_head))
1669 neighbor->pm_queue_size--;
1670 GNUNET_CONTAINER_DLL_remove (neighbor->pm_head,
1673 GNUNET_free (pending);
1675 handle_direct_disconnect (neighbor);
1676 GNUNET_assert (GNUNET_YES ==
1677 GNUNET_CONTAINER_multipeermap_remove (direct_neighbors,
1680 GNUNET_free (neighbor);
1685 * Method called whenever a given peer disconnects.
1687 * @param cls closure
1688 * @param peer peer identity this notification is about
1691 handle_core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
1693 struct DirectNeighbor *neighbor;
1695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1696 "Received core peer disconnect message for peer `%s'!\n",
1698 /* Check for disconnect from self message */
1699 if (0 == memcmp (&my_identity, peer, sizeof (struct GNUNET_PeerIdentity)))
1702 GNUNET_CONTAINER_multipeermap_get (direct_neighbors, peer);
1703 if (NULL == neighbor)
1708 GNUNET_break (GNUNET_YES == neighbor->connected);
1709 neighbor->connected = GNUNET_NO;
1710 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1712 GNUNET_STATISTICS_update (stats,
1713 "# peers connected (1-hop)",
1716 cleanup_neighbor (neighbor);
1717 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1724 * Multipeermap iterator for freeing routes. Should never be called.
1727 * @param key key value stored under
1728 * @param value the route to be freed
1730 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1733 free_route (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
1735 struct Route *route = value;
1738 GNUNET_assert (GNUNET_YES ==
1739 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1740 release_route (route);
1741 send_disconnect_to_plugin (&route->target.peer);
1742 GNUNET_free (route);
1748 * Multipeermap iterator for freeing direct neighbors. Should never be called.
1751 * @param key key value stored under
1752 * @param value the direct neighbor to be freed
1754 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1757 free_direct_neighbors (void *cls, const struct GNUNET_PeerIdentity * key, void *value)
1759 struct DirectNeighbor *neighbor = value;
1762 cleanup_neighbor (neighbor);
1768 * Task run during shutdown.
1774 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1778 GNUNET_CORE_disconnect (core_api);
1780 GNUNET_ATS_performance_done (ats);
1782 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1783 &free_direct_neighbors, NULL);
1784 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1786 GNUNET_CONTAINER_multipeermap_destroy (direct_neighbors);
1787 GNUNET_CONTAINER_multipeermap_destroy (all_routes);
1788 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1790 GNUNET_SERVER_notification_context_destroy (nc);
1792 for (i=0;i<DEFAULT_FISHEYE_DEPTH - 1;i++)
1793 GNUNET_array_grow (consensi[i].targets,
1794 consensi[i].array_length,
1800 * Notify newly connected client about an existing route.
1802 * @param cls the 'struct GNUNET_SERVER_Client'
1803 * @param key peer identity
1804 * @param value the XXX.
1805 * @return GNUNET_OK (continue to iterate)
1808 add_route (void *cls,
1809 const struct GNUNET_PeerIdentity *key,
1812 struct GNUNET_SERVER_Client *client = cls;
1813 struct Route *route = value;
1814 struct GNUNET_DV_ConnectMessage cm;
1816 cm.header.size = htons (sizeof (cm));
1817 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
1818 cm.distance = htonl (route->target.distance);
1819 cm.peer = route->target.peer;
1821 GNUNET_SERVER_notification_context_unicast (nc,
1830 * Handle START-message. This is the first message sent to us
1831 * by the client (can only be one!).
1833 * @param cls closure (always NULL)
1834 * @param client identification of the client
1835 * @param message the actual message
1838 handle_start (void *cls, struct GNUNET_SERVER_Client *client,
1839 const struct GNUNET_MessageHeader *message)
1841 GNUNET_SERVER_notification_context_add (nc, client);
1842 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1843 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1850 * Called on core init.
1853 * @param identity this peer's identity
1856 core_init (void *cls,
1857 const struct GNUNET_PeerIdentity *identity)
1859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1861 GNUNET_i2s (identity));
1862 my_identity = *identity;
1867 * Process dv requests.
1869 * @param cls closure
1870 * @param server the initialized server
1871 * @param c configuration to use
1874 run (void *cls, struct GNUNET_SERVER_Handle *server,
1875 const struct GNUNET_CONFIGURATION_Handle *c)
1877 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
1878 {&handle_dv_route_message, GNUNET_MESSAGE_TYPE_DV_ROUTE, 0},
1881 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1882 {&handle_start, NULL,
1883 GNUNET_MESSAGE_TYPE_DV_START,
1884 sizeof (struct GNUNET_MessageHeader) },
1885 { &handle_dv_send_message, NULL,
1886 GNUNET_MESSAGE_TYPE_DV_SEND,
1892 direct_neighbors = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO);
1893 all_routes = GNUNET_CONTAINER_multipeermap_create (65536, GNUNET_NO);
1894 core_api = GNUNET_CORE_connect (cfg, NULL,
1896 &handle_core_connect,
1897 &handle_core_disconnect,
1902 if (NULL == core_api)
1904 ats = GNUNET_ATS_performance_init (cfg, &handle_ats_update, NULL);
1907 GNUNET_CORE_disconnect (core_api);
1910 nc = GNUNET_SERVER_notification_context_create (server,
1911 MAX_QUEUE_SIZE_PLUGIN);
1912 stats = GNUNET_STATISTICS_create ("dv", cfg);
1913 GNUNET_SERVER_add_handlers (server, plugin_handlers);
1914 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
1915 &shutdown_task, NULL);
1920 * The main function for the dv service.
1922 * @param argc number of arguments from the command line
1923 * @param argv command line arguments
1924 * @return 0 ok, 1 on error
1927 main (int argc, char *const *argv)
1929 return (GNUNET_OK ==
1930 GNUNET_SERVICE_run (argc, argv, "dv", GNUNET_SERVICE_OPTION_NONE,
1931 &run, NULL)) ? 0 : 1;
1934 /* end of gnunet-service-dv.c */