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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2013, 2016 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19*/
20
21/**
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
25 * them
26 *
27 * @author Christian Grothoff
28 * @author Nathan Evans
29 */
30#include "platform.h"
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"
39#include "dv.h"
40#include <gcrypt.h>
41
42
43/**
44 * How often do we establish the consensu?
45 */
46#define GNUNET_DV_CONSENSUS_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MINUTES, 5)
47
48/**
49 * Maximum number of messages we queue per peer.
50 */
51#define MAX_QUEUE_SIZE 16
52
53/**
54 * Maximum number of messages we queue towards the clients/plugin.
55 */
56#define MAX_QUEUE_SIZE_PLUGIN 1024
57
58/**
59 * The default fisheye depth, from how many hops away will
60 * we keep peers?
61 */
62#define DEFAULT_FISHEYE_DEPTH 3
63
64/**
65 * How many hops is a direct neighbor away?
66 */
67#define DIRECT_NEIGHBOR_COST 1
68
69
70GNUNET_NETWORK_STRUCT_BEGIN
71
72/**
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.
76 */
77struct Target
78{
79
80 /**
81 * Identity of the peer we can reach.
82 */
83 struct GNUNET_PeerIdentity peer;
84
85 /**
86 * How many hops (1-3) is this peer away? in network byte order
87 */
88 uint32_t distance GNUNET_PACKED;
89
90};
91
92
93/**
94 * Message exchanged between DV services (via core), requesting a
95 * message to be routed.
96 */
97struct RouteMessage
98{
99 /**
100 * Type: #GNUNET_MESSAGE_TYPE_DV_ROUTE
101 */
102 struct GNUNET_MessageHeader header;
103
104 /**
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.
109 */
110 uint32_t distance GNUNET_PACKED;
111
112 /**
113 * The (actual) target of the message (this peer, if distance is zero).
114 */
115 struct GNUNET_PeerIdentity target;
116
117 /**
118 * The (actual) sender of the message.
119 */
120 struct GNUNET_PeerIdentity sender;
121
122};
123
124GNUNET_NETWORK_STRUCT_END
125
126
127/**
128 * Information about a direct neighbor (core-level, excluding
129 * DV-links, only DV-enabled peers).
130 */
131struct DirectNeighbor
132{
133
134 /**
135 * Identity of the peer.
136 */
137 struct GNUNET_PeerIdentity peer;
138
139 /**
140 * Session ID we use whenever we create a set union with
141 * this neighbor; constructed from the XOR of our peer
142 * IDs and then salted with "DV-SALT" to avoid conflicts
143 * with other applications.
144 */
145 struct GNUNET_HashCode real_session_id;
146
147 /**
148 * Transmit handle to core service.
149 */
150 struct GNUNET_MQ_Handle *mq;
151
152 /**
153 * Routing table of the neighbor, NULL if not yet established.
154 * Keys are peer identities, values are 'struct Target' entries.
155 * Note that the distances in the targets are from the point-of-view
156 * of the peer, not from us!
157 */
158 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table;
159
160 /**
161 * Updated routing table of the neighbor, under construction,
162 * NULL if we are not currently building it.
163 * Keys are peer identities, values are 'struct Target' entries.
164 * Note that the distances in the targets are from the point-of-view
165 * of the other peer, not from us!
166 */
167 struct GNUNET_CONTAINER_MultiPeerMap *neighbor_table_consensus;
168
169 /**
170 * Our current (exposed) routing table as a set.
171 */
172 struct GNUNET_SET_Handle *my_set;
173
174 /**
175 * Handle for our current active set union operation.
176 */
177 struct GNUNET_SET_OperationHandle *set_op;
178
179 /**
180 * Handle used if we are listening for this peer, waiting for the
181 * other peer to initiate construction of the set union. NULL if
182 * we ar the initiating peer.
183 */
184 struct GNUNET_SET_ListenHandle *listen_handle;
185
186 /**
187 * ID of the task we use to (periodically) update our consensus
188 * with this peer. Used if we are the initiating peer.
189 */
190 struct GNUNET_SCHEDULER_Task *initiate_task;
191
192 /**
193 * At what offset are we, with respect to inserting our own routes
194 * into the consensus?
195 */
196 unsigned int consensus_insertion_offset;
197
198 /**
199 * At what distance are we, with respect to inserting our own routes
200 * into the consensus?
201 */
202 unsigned int consensus_insertion_distance;
203
204 /**
205 * Elements in consensus
206 */
207 unsigned int consensus_elements;
208
209 /**
210 * Direct one hop route
211 */
212 struct Route *direct_route;
213
214 /**
215 * Flag set within 'check_target_removed' to trigger full global route refresh.
216 */
217 int target_removed;
218
219 /**
220 * Our distance to this peer, 0 for unknown.
221 */
222 uint32_t distance;
223
224 /**
225 * The network this peer is in
226 */
227 enum GNUNET_NetworkType network;
228
229 /**
230 * Is this neighbor connected at the core level?
231 */
232 int connected;
233
234};
235
236
237/**
238 * A route includes information about the next hop,
239 * the target, and the ultimate distance to the
240 * target.
241 */
242struct Route
243{
244
245 /**
246 * Which peer do we need to forward the message to?
247 */
248 struct DirectNeighbor *next_hop;
249
250 /**
251 * What would be the target, and how far is it away?
252 */
253 struct Target target;
254
255 /**
256 * Offset of this target in the respective consensus set.
257 */
258 unsigned int set_offset;
259
260};
261
262
263/**
264 * Set of targets we bring to a consensus; all targets in a set have a
265 * distance equal to the sets distance (which is implied by the array
266 * index of the set).
267 */
268struct ConsensusSet
269{
270
271 /**
272 * Array of targets in the set, may include NULL entries if a
273 * neighbor has disconnected; the targets are allocated with the
274 * respective container (all_routes), not here.
275 */
276 struct Route **targets;
277
278 /**
279 * Size of the @e targets array.
280 */
281 unsigned int array_length;
282
283};
284
285
286/**
287 * Peermap of all of our neighbors; processing these usually requires
288 * first checking to see if the peer is core-connected and if the
289 * distance is 1, in which case they are direct neighbors.
290 */
291static struct GNUNET_CONTAINER_MultiPeerMap *direct_neighbors;
292
293/**
294 * Hashmap with all routes that we currently support; contains
295 * routing information for all peers from distance 2
296 * up to distance #DEFAULT_FISHEYE_DEPTH.
297 */
298static struct GNUNET_CONTAINER_MultiPeerMap *all_routes;
299
300/**
301 * Array of consensus sets we expose to the outside world. Sets
302 * are structured by the distance to the target.
303 */
304static struct ConsensusSet consensi[DEFAULT_FISHEYE_DEPTH];
305
306/**
307 * Handle to the core service api.
308 */
309static struct GNUNET_CORE_Handle *core_api;
310
311/**
312 * The identity of our peer.
313 */
314static struct GNUNET_PeerIdentity my_identity;
315
316/**
317 * The configuration for this service.
318 */
319static const struct GNUNET_CONFIGURATION_Handle *cfg;
320
321/**
322 * The client, the DV plugin connected to us (or an event monitor).
323 * Hopefully this client will never change, although if the plugin
324 * dies and returns for some reason it may happen.
325 */
326static struct GNUNET_NotificationContext *nc;
327
328/**
329 * Handle for the statistics service.
330 */
331static struct GNUNET_STATISTICS_Handle *stats;
332
333/**
334 * Handle to ATS service.
335 */
336static struct GNUNET_ATS_PerformanceHandle *ats;
337
338/**
339 * Task scheduled to refresh routes based on direct neighbours.
340 */
341static struct GNUNET_SCHEDULER_Task *rr_task;
342
343/**
344 * #GNUNET_YES if we are shutting down.
345 */
346static int in_shutdown;
347
348/**
349 * Start creating a new DV set union by initiating the connection.
350 *
351 * @param cls the 'struct DirectNeighbor' of the peer we're building
352 * a routing consensus with
353 */
354static void
355initiate_set_union (void *cls);
356
357
358/**
359 * Start creating a new DV set union construction, our neighbour has
360 * asked for it (callback for listening peer).
361 *
362 * @param cls the 'struct DirectNeighbor' of the peer we're building
363 * a routing consensus with
364 * @param other_peer the other peer
365 * @param context_msg message with application specific information from
366 * the other peer
367 * @param request request from the other peer, use GNUNET_SET_accept
368 * to accept it, otherwise the request will be refused
369 * Note that we don't use a return value here, as it is also
370 * necessary to specify the set we want to do the operation with,
371 * whith sometimes can be derived from the context message.
372 * Also necessary to specify the timeout.
373 */
374static void
375listen_set_union (void *cls,
376 const struct GNUNET_PeerIdentity *other_peer,
377 const struct GNUNET_MessageHeader *context_msg,
378 struct GNUNET_SET_Request *request);
379
380
381/**
382 * Forward a message from another peer to the plugin.
383 *
384 * @param message the message to send to the plugin
385 * @param origin the original sender of the message
386 * @param distance distance to the original sender of the message
387 */
388static void
389send_data_to_plugin (const struct GNUNET_MessageHeader *message,
390 const struct GNUNET_PeerIdentity *origin,
391 uint32_t distance)
392{
393 struct GNUNET_DV_ReceivedMessage *received_msg;
394 size_t size;
395
396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
397 "Delivering message from peer `%s' at distance %u\n",
398 GNUNET_i2s (origin),
399 (unsigned int) distance);
400 size = sizeof (struct GNUNET_DV_ReceivedMessage) +
401 ntohs (message->size);
402 if (size >= GNUNET_MAX_MESSAGE_SIZE)
403 {
404 GNUNET_break (0); /* too big */
405 return;
406 }
407 received_msg = GNUNET_malloc (size);
408 received_msg->header.size = htons (size);
409 received_msg->header.type = htons (GNUNET_MESSAGE_TYPE_DV_RECV);
410 received_msg->distance = htonl (distance);
411 received_msg->sender = *origin;
412 GNUNET_memcpy (&received_msg[1], message, ntohs (message->size));
413 GNUNET_notification_context_broadcast (nc,
414 &received_msg->header,
415 GNUNET_YES);
416 GNUNET_free (received_msg);
417}
418
419
420/**
421 * Forward a control message to the plugin.
422 *
423 * @param message the message to send to the plugin
424 */
425static void
426send_control_to_plugin (const struct GNUNET_MessageHeader *message)
427{
428 GNUNET_notification_context_broadcast (nc,
429 message,
430 GNUNET_NO);
431}
432
433
434/**
435 * Send a DISTANCE_CHANGED message to the plugin.
436 *
437 * @param peer peer with a changed distance
438 * @param distance new distance to the peer
439 * @param network network used by the neighbor
440 */
441static void
442send_distance_change_to_plugin (const struct GNUNET_PeerIdentity *peer,
443 uint32_t distance,
444 enum GNUNET_NetworkType network)
445{
446 struct GNUNET_DV_DistanceUpdateMessage du_msg;
447
448 GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
450 "Delivering DISTANCE_CHANGED for message about peer `%s'\n",
451 GNUNET_i2s (peer));
452 du_msg.header.size = htons (sizeof (du_msg));
453 du_msg.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISTANCE_CHANGED);
454 du_msg.distance = htonl (distance);
455 du_msg.peer = *peer;
456 du_msg.network = htonl ((uint32_t) network);
457 send_control_to_plugin (&du_msg.header);
458}
459
460
461/**
462 * Give a CONNECT message to the plugin.
463 *
464 * @param target peer that connected
465 * @param distance distance to the target
466 * @param network the network the next hop is located in
467 */
468static void
469send_connect_to_plugin (const struct GNUNET_PeerIdentity *target,
470 uint32_t distance,
471 enum GNUNET_NetworkType network)
472{
473 struct GNUNET_DV_ConnectMessage cm;
474
475 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
476 "Delivering CONNECT about peer %s with distance %u\n",
477 GNUNET_i2s (target), distance);
478 cm.header.size = htons (sizeof (cm));
479 cm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_CONNECT);
480 cm.distance = htonl (distance);
481 cm.network = htonl ((uint32_t) network);
482 cm.peer = *target;
483 send_control_to_plugin (&cm.header);
484}
485
486
487/**
488 * Give a DISCONNECT message to the plugin.
489 *
490 * @param target peer that disconnected
491 */
492static void
493send_disconnect_to_plugin (const struct GNUNET_PeerIdentity *target)
494{
495 struct GNUNET_DV_DisconnectMessage dm;
496
497 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
498 "Delivering DISCONNECT about peer `%s'\n",
499 GNUNET_i2s (target));
500 dm.header.size = htons (sizeof (dm));
501 dm.header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
502 dm.reserved = htonl (0);
503 dm.peer = *target;
504 send_control_to_plugin (&dm.header);
505}
506
507
508/**
509 * Forward the given payload to the given target.
510 *
511 * @param target where to send the message
512 * @param distance distance to the @a sender
513 * @param sender original sender of the message
514 * @param actual_target ultimate recipient for the message
515 * @param payload payload of the message
516 */
517static void
518forward_payload (struct DirectNeighbor *target,
519 uint32_t distance,
520 const struct GNUNET_PeerIdentity *sender,
521 const struct GNUNET_PeerIdentity *actual_target,
522 const struct GNUNET_MessageHeader *payload)
523{
524 struct GNUNET_MQ_Envelope *env;
525 struct RouteMessage *rm;
526
527 if ( (GNUNET_MQ_get_length (target->mq) >= MAX_QUEUE_SIZE) &&
528 (0 != memcmp (sender,
529 &my_identity,
530 sizeof (struct GNUNET_PeerIdentity))) )
531 {
532 /* not _our_ client and queue is full, drop */
533 GNUNET_STATISTICS_update (stats,
534 "# messages dropped",
535 1,
536 GNUNET_NO);
537 return;
538 }
539 if (sizeof (struct RouteMessage) + ntohs (payload->size)
540 >= GNUNET_MAX_MESSAGE_SIZE)
541 {
542 GNUNET_break (0);
543 return;
544 }
545 env = GNUNET_MQ_msg_nested_mh (rm,
546 GNUNET_MESSAGE_TYPE_DV_ROUTE,
547 payload);
548 rm->distance = htonl (distance);
549 rm->target = *actual_target;
550 rm->sender = *sender;
551 GNUNET_MQ_send (target->mq,
552 env);
553}
554
555
556/**
557 * Find a free slot for storing a 'route' in the 'consensi'
558 * set at the given distance.
559 *
560 * @param distance distance to use for the set slot
561 */
562static unsigned int
563get_consensus_slot (uint32_t distance)
564{
565 struct ConsensusSet *cs;
566 unsigned int i;
567
568 GNUNET_assert (distance < DEFAULT_FISHEYE_DEPTH);
569 cs = &consensi[distance];
570 i = 0;
571 while ( (i < cs->array_length) &&
572 (NULL != cs->targets[i]) ) i++;
573 if (i == cs->array_length)
574 {
575 GNUNET_array_grow (cs->targets,
576 cs->array_length,
577 cs->array_length * 2 + 2);
578 }
579 return i;
580}
581
582
583/**
584 * Allocate a slot in the consensus set for a route.
585 *
586 * @param route route to initialize
587 * @param distance which consensus set to use
588 */
589static void
590allocate_route (struct Route *route,
591 uint32_t distance)
592{
593 unsigned int i;
594
595 if (distance >= DEFAULT_FISHEYE_DEPTH)
596 {
597 route->target.distance = htonl (distance);
598 route->set_offset = UINT_MAX; /* invalid slot */
599 return;
600 }
601 i = get_consensus_slot (distance);
602 route->set_offset = i;
603 consensi[distance].targets[i] = route;
604 route->target.distance = htonl (distance);
605}
606
607
608/**
609 * Release a slot in the consensus set for a route.
610 *
611 * @param route route to release the slot from
612 */
613static void
614release_route (struct Route *route)
615{
616 if (UINT_MAX == route->set_offset)
617 return;
618 GNUNET_assert (ntohl (route->target.distance) < DEFAULT_FISHEYE_DEPTH);
619 consensi[ntohl (route->target.distance)].targets[route->set_offset] = NULL;
620 route->set_offset = UINT_MAX; /* indicate invalid slot */
621}
622
623
624/**
625 * Move a route from one consensus set to another.
626 *
627 * @param route route to move
628 * @param new_distance new distance for the route (destination set)
629 */
630static void
631move_route (struct Route *route,
632 uint32_t new_distance)
633{
634 release_route (route);
635 allocate_route (route, new_distance);
636}
637
638
639/**
640 * Initialize this neighbors 'my_set' and when done give
641 * it to the pending set operation for execution.
642 *
643 * Add a single element to the set per call:
644 *
645 * If we reached the last element of a consensus element: increase distance
646 *
647 *
648 * @param cls the neighbor for which we are building the set
649 */
650static void
651build_set (void *cls)
652{
653 struct DirectNeighbor *neighbor = cls;
654 struct GNUNET_SET_Element element;
655 struct Target *target;
656 struct Route *route;
657
658 target = NULL;
659 /* skip over NULL entries */
660 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
661 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
662 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
663 neighbor->consensus_insertion_offset++;
664 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
665 (consensi[neighbor->consensus_insertion_distance].array_length == neighbor->consensus_insertion_offset) )
666 {
667 /* If we reached the last element of a consensus array element: increase distance and start with next array */
668 neighbor->consensus_insertion_offset = 0;
669 neighbor->consensus_insertion_distance++;
670 /* skip over NULL entries */
671 while ( (DEFAULT_FISHEYE_DEPTH > neighbor->consensus_insertion_distance) &&
672 (consensi[neighbor->consensus_insertion_distance].array_length > neighbor->consensus_insertion_offset) &&
673 (NULL == consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset]) )
674 neighbor->consensus_insertion_offset++;
675 }
676 if (DEFAULT_FISHEYE_DEPTH == neighbor->consensus_insertion_distance)
677 {
678 /* we have added all elements to the set, run the operation */
679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
680 "Finished building my SET for peer `%s' with %u elements, committing\n",
681 GNUNET_i2s (&neighbor->peer),
682 neighbor->consensus_elements);
683 GNUNET_SET_commit (neighbor->set_op,
684 neighbor->my_set);
685 GNUNET_SET_destroy (neighbor->my_set);
686 neighbor->my_set = NULL;
687 return;
688 }
689
690 route = consensi[neighbor->consensus_insertion_distance].targets[neighbor->consensus_insertion_offset];
691 GNUNET_assert (NULL != route);
692 target = &route->target;
693 GNUNET_assert (ntohl (target->distance) < DEFAULT_FISHEYE_DEPTH);
694 element.size = sizeof (struct Target);
695 element.element_type = htons (0);
696 element.data = target;
697
698 /* Find next non-NULL entry */
699 neighbor->consensus_insertion_offset++;
700 if ( (0 != memcmp (&target->peer,
701 &my_identity,
702 sizeof (my_identity))) &&
703 (0 != memcmp (&target->peer,
704 &neighbor->peer,
705 sizeof (struct GNUNET_PeerIdentity))) )
706 {
707 /* Add target if it is not the neighbor or this peer */
708 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
709 "Adding peer `%s' with distance %u to SET\n",
710 GNUNET_i2s (&target->peer),
711 ntohl (target->distance) + 1);
712 GNUNET_SET_add_element (neighbor->my_set,
713 &element,
714 &build_set, neighbor);
715 neighbor->consensus_elements++;
716 }
717 else
718 build_set (neighbor);
719}
720
721
722/**
723 * A peer is now connected to us at distance 1. Initiate DV exchange.
724 *
725 * @param neighbor entry for the neighbor at distance 1
726 */
727static void
728handle_direct_connect (struct DirectNeighbor *neighbor)
729{
730 struct Route *route;
731 struct GNUNET_HashCode h1;
732 struct GNUNET_HashCode h2;
733 struct GNUNET_HashCode session_id;
734
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Direct connection to %s established, routing table exchange begins.\n",
737 GNUNET_i2s (&neighbor->peer));
738 GNUNET_STATISTICS_update (stats,
739 "# peers connected (1-hop)",
740 1, GNUNET_NO);
741 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
742 &neighbor->peer);
743 if (NULL != route)
744 {
745 GNUNET_assert (GNUNET_YES ==
746 GNUNET_CONTAINER_multipeermap_remove (all_routes,
747 &neighbor->peer,
748 route));
749 send_disconnect_to_plugin (&neighbor->peer);
750 release_route (route);
751 GNUNET_free (route);
752 }
753
754 neighbor->direct_route = GNUNET_new (struct Route);
755 neighbor->direct_route->next_hop = neighbor;
756 neighbor->direct_route->target.peer = neighbor->peer;
757 allocate_route (neighbor->direct_route, DIRECT_NEIGHBOR_COST);
758
759 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
760 "Adding direct route to %s\n",
761 GNUNET_i2s (&neighbor->direct_route->target.peer));
762
763
764 /* construct session ID seed as XOR of both peer's identities */
765 GNUNET_CRYPTO_hash (&my_identity,
766 sizeof (my_identity),
767 &h1);
768 GNUNET_CRYPTO_hash (&neighbor->peer,
769 sizeof (struct GNUNET_PeerIdentity),
770 &h2);
771 GNUNET_CRYPTO_hash_xor (&h1,
772 &h2,
773 &session_id);
774 /* make sure session ID is unique across applications by salting it with 'DV' */
775 GNUNET_CRYPTO_hkdf (&neighbor->real_session_id, sizeof (struct GNUNET_HashCode),
776 GCRY_MD_SHA512, GCRY_MD_SHA256,
777 "DV-SALT", 2,
778 &session_id, sizeof (session_id),
779 NULL, 0);
780 if (0 < memcmp (&neighbor->peer,
781 &my_identity,
782 sizeof (struct GNUNET_PeerIdentity)))
783 {
784 if (NULL != neighbor->listen_handle)
785 {
786 GNUNET_break (0);
787 }
788 else
789 neighbor->initiate_task = GNUNET_SCHEDULER_add_now (&initiate_set_union,
790 neighbor);
791 }
792 else
793 {
794 if (NULL != neighbor->listen_handle)
795 {
796 GNUNET_break (0);
797 }
798 else
799 {
800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
801 "Starting SET listen operation with peer `%s'\n",
802 GNUNET_i2s (&neighbor->peer));
803 neighbor->listen_handle = GNUNET_SET_listen (cfg,
804 GNUNET_SET_OPERATION_UNION,
805 &neighbor->real_session_id,
806 &listen_set_union,
807 neighbor);
808 }
809 }
810}
811
812
813/**
814 * Method called whenever a peer connects.
815 *
816 * @param cls closure
817 * @param peer peer identity this notification is about
818 * @param mq message queue for sending data to @a peer
819 * @return our `struct DirectNeighbour` for this peer
820 */
821static void *
822handle_core_connect (void *cls,
823 const struct GNUNET_PeerIdentity *peer,
824 struct GNUNET_MQ_Handle *mq)
825{
826 struct DirectNeighbor *neighbor;
827
828 /* Check for connect to self message */
829 if (0 == memcmp (&my_identity,
830 peer,
831 sizeof (struct GNUNET_PeerIdentity)))
832 return NULL;
833 /* check if entry exists */
834 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
835 peer);
836 if (NULL != neighbor)
837 {
838 GNUNET_break (GNUNET_NT_UNSPECIFIED != neighbor->network);
839 GNUNET_break (GNUNET_YES != neighbor->connected);
840 neighbor->connected = GNUNET_YES;
841 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
842 "Core connected to %s (distance %u)\n",
843 GNUNET_i2s (peer),
844 (unsigned int) neighbor->distance);
845 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
846 return NULL;
847 handle_direct_connect (neighbor);
848 return NULL;
849 }
850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
851 "Core connected to %s (distance unknown)\n",
852 GNUNET_i2s (peer));
853 neighbor = GNUNET_new (struct DirectNeighbor);
854 neighbor->peer = *peer;
855 GNUNET_assert (GNUNET_YES ==
856 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
857 &neighbor->peer,
858 neighbor,
859 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
860 neighbor->connected = GNUNET_YES;
861 neighbor->distance = 0; /* unknown */
862 neighbor->network = GNUNET_NT_UNSPECIFIED;
863 return neighbor;
864}
865
866
867/**
868 * Called for each 'target' in a neighbor table to free the associated memory.
869 *
870 * @param cls NULL
871 * @param key key of the value
872 * @param value value to free
873 * @return #GNUNET_OK to continue to iterate
874 */
875static int
876free_targets (void *cls,
877 const struct GNUNET_PeerIdentity *key,
878 void *value)
879{
880 GNUNET_free (value);
881 return GNUNET_OK;
882}
883
884
885/**
886 * Add a new route to the given @a target via the given @a neighbor.
887 *
888 * @param target the target of the route
889 * @param neighbor the next hop for communicating with the @a target
890 */
891static void
892add_new_route (struct Target *target,
893 struct DirectNeighbor *neighbor)
894{
895 struct Route *route;
896
897 route = GNUNET_new (struct Route);
898 route->next_hop = neighbor;
899 route->target.peer = target->peer;
900 allocate_route (route, ntohl (target->distance) + 1);
901 GNUNET_assert (GNUNET_YES ==
902 GNUNET_CONTAINER_multipeermap_put (all_routes,
903 &route->target.peer,
904 route,
905 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
906 send_connect_to_plugin (&route->target.peer,
907 ntohl (route->target.distance),
908 neighbor->network);
909}
910
911
912/**
913 * Multipeerhmap iterator for checking if a given route is
914 * (now) useful to this peer.
915 *
916 * @param cls the direct neighbor for the given route
917 * @param key key value stored under
918 * @param value a 'struct Target' that may or may not be useful; not that
919 * the distance in 'target' does not include the first hop yet
920 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
921 */
922static int
923check_possible_route (void *cls,
924 const struct GNUNET_PeerIdentity *key,
925 void *value)
926{
927 struct DirectNeighbor *neighbor = cls;
928 struct Target *target = value;
929 struct Route *route;
930
931 if (GNUNET_YES ==
932 GNUNET_CONTAINER_multipeermap_contains (direct_neighbors,
933 key))
934 return GNUNET_YES; /* direct route, do not care about alternatives */
935 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
936 key);
937 if (NULL != route)
938 {
939 /* we have an existing route, check how it compares with going via 'target' */
940 if (ntohl (route->target.distance) > ntohl (target->distance) + 1)
941 {
942 /* via 'target' is cheaper than the existing route; switch to alternative route! */
943 move_route (route, ntohl (target->distance) + 1);
944 route->next_hop = neighbor;
945 send_distance_change_to_plugin (&target->peer,
946 ntohl (target->distance) + 1,
947 neighbor->network);
948 }
949 return GNUNET_YES; /* got a route to this target already */
950 }
951 if (ntohl (target->distance) >= DEFAULT_FISHEYE_DEPTH)
952 return GNUNET_YES; /* distance is too large to be interesting */
953 add_new_route (target, neighbor);
954 return GNUNET_YES;
955}
956
957
958/**
959 * Multipeermap iterator for finding routes that were previously
960 * "hidden" due to a better route (called after a disconnect event).
961 *
962 * @param cls NULL
963 * @param key peer identity of the given direct neighbor
964 * @param value a `struct DirectNeighbor` to check for additional routes
965 * @return #GNUNET_YES to continue iteration
966 */
967static int
968refresh_routes (void *cls,
969 const struct GNUNET_PeerIdentity *key,
970 void *value)
971{
972 struct DirectNeighbor *neighbor = value;
973
974 if ( (GNUNET_YES != neighbor->connected) ||
975 (DIRECT_NEIGHBOR_COST != neighbor->distance) )
976 return GNUNET_YES;
977 if (NULL != neighbor->neighbor_table)
978 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
979 &check_possible_route,
980 neighbor);
981 return GNUNET_YES;
982}
983
984
985/**
986 * Task to run #refresh_routes() on all direct neighbours.
987 *
988 * @param cls NULL
989 */
990static void
991refresh_routes_task (void *cls)
992{
993 rr_task = NULL;
994 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
995 &refresh_routes,
996 NULL);
997}
998
999
1000/**
1001 * Asynchronously run #refresh_routes() at the next opportunity
1002 * on all direct neighbours.
1003 */
1004static void
1005schedule_refresh_routes ()
1006{
1007 if (NULL == rr_task)
1008 rr_task = GNUNET_SCHEDULER_add_now (&refresh_routes_task,
1009 NULL);
1010}
1011
1012
1013/**
1014 * Multipeermap iterator for freeing routes that go via a particular
1015 * neighbor that disconnected and is thus no longer available.
1016 *
1017 * @param cls the direct neighbor that is now unavailable
1018 * @param key key value stored under
1019 * @param value a `struct Route` that may or may not go via neighbor
1020 *
1021 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1022 */
1023static int
1024cull_routes (void *cls,
1025 const struct GNUNET_PeerIdentity *key,
1026 void *value)
1027{
1028 struct DirectNeighbor *neighbor = cls;
1029 struct Route *route = value;
1030
1031 if (route->next_hop != neighbor)
1032 return GNUNET_YES; /* not affected */
1033 GNUNET_assert (GNUNET_YES ==
1034 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1035 release_route (route);
1036 send_disconnect_to_plugin (&route->target.peer);
1037 GNUNET_free (route);
1038 return GNUNET_YES;
1039}
1040
1041
1042/**
1043 * Handle the case that a direct connection to a peer is
1044 * disrupted. Remove all routes via that peer and
1045 * stop the consensus with it.
1046 *
1047 * @param neighbor peer that was disconnected (or at least is no
1048 * longer at distance 1)
1049 */
1050static void
1051handle_direct_disconnect (struct DirectNeighbor *neighbor)
1052{
1053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1054 "Culling routes via %s due to direct disconnect\n",
1055 GNUNET_i2s (&neighbor->peer));
1056 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1057 &cull_routes,
1058 neighbor);
1059 if (NULL != neighbor->direct_route)
1060 {
1061 release_route (neighbor->direct_route);
1062 GNUNET_free (neighbor->direct_route);
1063 neighbor->direct_route = NULL;
1064 }
1065 if (NULL != neighbor->neighbor_table_consensus)
1066 {
1067 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1068 &free_targets,
1069 NULL);
1070 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1071 neighbor->neighbor_table_consensus = NULL;
1072 }
1073 if (NULL != neighbor->neighbor_table)
1074 {
1075 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1076 &free_targets,
1077 NULL);
1078 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1079 neighbor->neighbor_table = NULL;
1080 }
1081 if (NULL != neighbor->set_op)
1082 {
1083 GNUNET_SET_operation_cancel (neighbor->set_op);
1084 neighbor->set_op = NULL;
1085 }
1086 if (NULL != neighbor->my_set)
1087 {
1088 GNUNET_SET_destroy (neighbor->my_set);
1089 neighbor->my_set = NULL;
1090 }
1091 if (NULL != neighbor->listen_handle)
1092 {
1093 GNUNET_SET_listen_cancel (neighbor->listen_handle);
1094 neighbor->listen_handle = NULL;
1095 }
1096 if (NULL != neighbor->initiate_task)
1097 {
1098 GNUNET_SCHEDULER_cancel (neighbor->initiate_task);
1099 neighbor->initiate_task = NULL;
1100 }
1101}
1102
1103
1104/**
1105 * Function that is called with QoS information about an address; used
1106 * to update our current distance to another peer.
1107 *
1108 * @param cls closure
1109 * @param address the address
1110 * @param active #GNUNET_YES if this address is actively used
1111 * to maintain a connection to a peer;
1112 * #GNUNET_NO if the address is not actively used;
1113 * #GNUNET_SYSERR if this address is no longer available for ATS
1114 * @param bandwidth_out assigned outbound bandwidth for the connection
1115 * @param bandwidth_in assigned inbound bandwidth for the connection
1116 * @param prop performance data for the address (as far as known)
1117 */
1118static void
1119handle_ats_update (void *cls,
1120 const struct GNUNET_HELLO_Address *address,
1121 int active,
1122 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_out,
1123 struct GNUNET_BANDWIDTH_Value32NBO bandwidth_in,
1124 const struct GNUNET_ATS_Properties *prop)
1125{
1126 struct DirectNeighbor *neighbor;
1127 uint32_t distance;
1128 enum GNUNET_NetworkType network;
1129
1130 if (NULL == address)
1131 {
1132 /* ATS service temporarily disconnected */
1133 return;
1134 }
1135
1136 if (GNUNET_YES != active)
1137 {
1138 // FIXME: handle disconnect/inactive case too!
1139 return;
1140 }
1141 distance = prop->distance;
1142 network = prop->scope;
1143 GNUNET_break (GNUNET_NT_UNSPECIFIED != network);
1144 /* check if entry exists */
1145 neighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1146 &address->peer);
1147 if (NULL != neighbor)
1148 {
1149 neighbor->network = network;
1150 if (neighbor->distance == distance)
1151 return; /* nothing new to see here, move along */
1152 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1153 "ATS says distance to %s is now %u\n",
1154 GNUNET_i2s (&address->peer),
1155 (unsigned int) distance);
1156 if ( (DIRECT_NEIGHBOR_COST == neighbor->distance) &&
1157 (DIRECT_NEIGHBOR_COST == distance) )
1158 return; /* no change */
1159 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1160 {
1161 neighbor->distance = distance;
1162 GNUNET_STATISTICS_update (stats,
1163 "# peers connected (1-hop)",
1164 -1, GNUNET_NO);
1165 handle_direct_disconnect (neighbor);
1166 schedule_refresh_routes ();
1167 return;
1168 }
1169 neighbor->distance = distance;
1170 if (DIRECT_NEIGHBOR_COST != neighbor->distance)
1171 return;
1172 if (GNUNET_YES != neighbor->connected)
1173 return;
1174 handle_direct_connect (neighbor);
1175 return;
1176 }
1177 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1178 "ATS says distance to %s is now %u\n",
1179 GNUNET_i2s (&address->peer),
1180 (unsigned int) distance);
1181 neighbor = GNUNET_new (struct DirectNeighbor);
1182 neighbor->peer = address->peer;
1183 GNUNET_assert (GNUNET_YES ==
1184 GNUNET_CONTAINER_multipeermap_put (direct_neighbors,
1185 &neighbor->peer,
1186 neighbor,
1187 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1188 neighbor->connected = GNUNET_NO; /* not yet */
1189 neighbor->distance = distance;
1190 neighbor->network = network;
1191}
1192
1193
1194/**
1195 * Check if a target was removed from the set of the other peer; if so,
1196 * if we also used it for our route, we need to remove it from our
1197 * 'all_routes' set (and later check if an alternative path now exists).
1198 *
1199 * @param cls the `struct DirectNeighbor`
1200 * @param key peer identity for the target
1201 * @param value a `struct Target` previously reachable via the given neighbor
1202 */
1203static int
1204check_target_removed (void *cls,
1205 const struct GNUNET_PeerIdentity *key,
1206 void *value)
1207{
1208 struct DirectNeighbor *neighbor = cls;
1209 struct Target *new_target;
1210 struct Route *current_route;
1211
1212 new_target = GNUNET_CONTAINER_multipeermap_get (neighbor->neighbor_table_consensus,
1213 key);
1214 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1215 key);
1216 if (NULL != new_target)
1217 {
1218 /* target was in old set, is in new set */
1219 if ( (NULL != current_route) &&
1220 (current_route->next_hop == neighbor) &&
1221 (current_route->target.distance != new_target->distance) )
1222 {
1223 /* need to recalculate routes due to distance change */
1224 neighbor->target_removed = GNUNET_YES;
1225 }
1226 return GNUNET_OK;
1227 }
1228 /* target was revoked, check if it was used */
1229 if ( (NULL == current_route) ||
1230 (current_route->next_hop != neighbor) )
1231 {
1232 /* didn't matter, wasn't used */
1233 return GNUNET_OK;
1234 }
1235 /* remove existing route */
1236 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1237 "Lost route to %s\n",
1238 GNUNET_i2s (&current_route->target.peer));
1239 GNUNET_assert (GNUNET_YES ==
1240 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, current_route));
1241 send_disconnect_to_plugin (&current_route->target.peer);
1242 release_route (current_route);
1243 GNUNET_free (current_route);
1244 neighbor->target_removed = GNUNET_YES;
1245 return GNUNET_OK;
1246}
1247
1248
1249/**
1250 * Check if a target was added to the set of the other peer; if it
1251 * was added or impoves the existing route, do the needed updates.
1252 *
1253 * @param cls the `struct DirectNeighbor`
1254 * @param key peer identity for the target
1255 * @param value a `struct Target` now reachable via the given neighbor
1256 */
1257static int
1258check_target_added (void *cls,
1259 const struct GNUNET_PeerIdentity *key,
1260 void *value)
1261{
1262 struct DirectNeighbor *neighbor = cls;
1263 struct Target *target = value;
1264 struct Route *current_route;
1265
1266 /* target was revoked, check if it was used */
1267 current_route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1268 key);
1269 if (NULL != current_route)
1270 {
1271 /* route exists */
1272 if (current_route->next_hop == neighbor)
1273 {
1274 /* we had the same route before, no change in target */
1275 if (ntohl (target->distance) + 1 != ntohl (current_route->target.distance))
1276 {
1277 /* but distance changed! */
1278 if (ntohl (target->distance) + 1 > DEFAULT_FISHEYE_DEPTH)
1279 {
1280 /* distance increased beyond what is allowed, kill route */
1281 GNUNET_assert (GNUNET_YES ==
1282 GNUNET_CONTAINER_multipeermap_remove (all_routes,
1283 key,
1284 current_route));
1285 send_disconnect_to_plugin (key);
1286 release_route (current_route);
1287 GNUNET_free (current_route);
1288 }
1289 else
1290 {
1291 /* distance decreased, update route */
1292 move_route (current_route,
1293 ntohl (target->distance) + 1);
1294 send_distance_change_to_plugin (&target->peer,
1295 ntohl (target->distance) + 1,
1296 neighbor->network);
1297 }
1298 }
1299 return GNUNET_OK;
1300 }
1301 if (ntohl (current_route->target.distance) <= ntohl (target->distance) + 1)
1302 {
1303 /* alternative, shorter route exists, ignore */
1304 return GNUNET_OK;
1305 }
1306 /* new route is better than the existing one, take over! */
1307 /* NOTE: minor security issue: malicious peers may advertise
1308 very short routes to take over longer paths; as we don't
1309 check that the shorter routes actually work, a malicious
1310 direct neighbor can use this to DoS our long routes */
1311
1312 move_route (current_route, ntohl (target->distance) + 1);
1313 current_route->next_hop = neighbor;
1314 send_distance_change_to_plugin (&target->peer,
1315 ntohl (target->distance) + 1,
1316 neighbor->network);
1317 return GNUNET_OK;
1318 }
1319 /* new route */
1320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1321 "Discovered new route to %s using %u hops\n",
1322 GNUNET_i2s (&target->peer),
1323 (unsigned int) (ntohl (target->distance) + 1));
1324 current_route = GNUNET_new (struct Route);
1325 current_route->next_hop = neighbor;
1326 current_route->target.peer = target->peer;
1327 allocate_route (current_route, ntohl (target->distance) + 1);
1328 GNUNET_assert (GNUNET_YES ==
1329 GNUNET_CONTAINER_multipeermap_put (all_routes,
1330 &current_route->target.peer,
1331 current_route,
1332 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
1333
1334 send_connect_to_plugin (&current_route->target.peer,
1335 ntohl (current_route->target.distance),
1336 neighbor->network);
1337 return GNUNET_OK;
1338}
1339
1340
1341/**
1342 * Callback for set operation results. Called for each element
1343 * in the result set.
1344 * We have learned a new route from the other peer. Add it to the
1345 * route set we're building.
1346 *
1347 * @param cls the `struct DirectNeighbor` we're building the consensus with
1348 * @param element a result element, only valid if status is #GNUNET_SET_STATUS_OK
1349 * @param current_size current set size
1350 * @param status see `enum GNUNET_SET_Status`
1351 */
1352static void
1353handle_set_union_result (void *cls,
1354 const struct GNUNET_SET_Element *element,
1355 uint64_t current_size,
1356 enum GNUNET_SET_Status status)
1357{
1358 struct DirectNeighbor *neighbor = cls;
1359 struct DirectNeighbor *dn;
1360 struct Target *target;
1361 const struct Target *ctarget;
1362 char *status_str;
1363
1364 switch (status)
1365 {
1366 case GNUNET_SET_STATUS_OK:
1367 status_str = "GNUNET_SET_STATUS_OK";
1368 break;
1369 case GNUNET_SET_STATUS_FAILURE:
1370 status_str = "GNUNET_SET_STATUS_FAILURE";
1371 break;
1372 case GNUNET_SET_STATUS_HALF_DONE:
1373 status_str = "GNUNET_SET_STATUS_HALF_DONE";
1374 break;
1375 case GNUNET_SET_STATUS_DONE:
1376 status_str = "GNUNET_SET_STATUS_DONE";
1377 break;
1378 default:
1379 status_str = "UNDEFINED";
1380 break;
1381 }
1382
1383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1384 "Got SET union result: %s\n",
1385 status_str);
1386 switch (status)
1387 {
1388 case GNUNET_SET_STATUS_OK:
1389 if (sizeof (struct Target) != element->size)
1390 {
1391 GNUNET_break_op (0);
1392 return;
1393 }
1394 ctarget = element->data;
1395 if ( (NULL !=
1396 (dn = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1397 &ctarget->peer))) &&
1398 (DIRECT_NEIGHBOR_COST == dn->distance) )
1399 {
1400 /* this is a direct neighbor of ours, we do not care about routes
1401 to this peer */
1402 return;
1403 }
1404 target = GNUNET_new (struct Target);
1405 GNUNET_memcpy (target, element->data, sizeof (struct Target));
1406 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1407 "Received information about peer `%s' with distance %u from SET\n",
1408 GNUNET_i2s (&target->peer),
1409 ntohl (target->distance) + 1);
1410
1411 if (NULL == neighbor->neighbor_table_consensus)
1412 neighbor->neighbor_table_consensus
1413 = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1414 if (GNUNET_YES !=
1415 GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table_consensus,
1416 &target->peer,
1417 target,
1418 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1419 {
1420 GNUNET_break_op (0);
1421 GNUNET_free (target);
1422 }
1423 break;
1424 case GNUNET_SET_STATUS_FAILURE:
1425 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1426 "Failed to establish DV union, will try again later\n");
1427 neighbor->set_op = NULL;
1428 if (NULL != neighbor->neighbor_table_consensus)
1429 {
1430 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1431 &free_targets,
1432 NULL);
1433 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table_consensus);
1434 neighbor->neighbor_table_consensus = NULL;
1435 }
1436 if (0 < memcmp (&neighbor->peer,
1437 &my_identity,
1438 sizeof (struct GNUNET_PeerIdentity)))
1439 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1440 &initiate_set_union,
1441 neighbor);
1442 break;
1443 case GNUNET_SET_STATUS_HALF_DONE:
1444 break;
1445 case GNUNET_SET_STATUS_DONE:
1446 /* we got all of our updates; integrate routing table! */
1447 neighbor->target_removed = GNUNET_NO;
1448 if (NULL == neighbor->neighbor_table_consensus)
1449 neighbor->neighbor_table_consensus = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1450 if (NULL != neighbor->neighbor_table)
1451 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1452 &check_target_removed,
1453 neighbor);
1454 if (GNUNET_YES == neighbor->target_removed)
1455 {
1456 /* check if we got an alternative for the removed routes */
1457 schedule_refresh_routes ();
1458 }
1459 /* add targets that appeared (and check for improved routes) */
1460 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table_consensus,
1461 &check_target_added,
1462 neighbor);
1463 if (NULL != neighbor->neighbor_table)
1464 {
1465 GNUNET_CONTAINER_multipeermap_iterate (neighbor->neighbor_table,
1466 &free_targets,
1467 NULL);
1468 GNUNET_CONTAINER_multipeermap_destroy (neighbor->neighbor_table);
1469 neighbor->neighbor_table = NULL;
1470 }
1471 neighbor->neighbor_table = neighbor->neighbor_table_consensus;
1472 neighbor->neighbor_table_consensus = NULL;
1473
1474 /* operation done, schedule next run! */
1475 neighbor->set_op = NULL;
1476 if (0 < memcmp (&neighbor->peer,
1477 &my_identity,
1478 sizeof (struct GNUNET_PeerIdentity)))
1479 neighbor->initiate_task = GNUNET_SCHEDULER_add_delayed (GNUNET_DV_CONSENSUS_FREQUENCY,
1480 &initiate_set_union,
1481 neighbor);
1482 break;
1483 default:
1484 GNUNET_break (0);
1485 return;
1486 }
1487}
1488
1489
1490/**
1491 * Start creating a new DV set union construction, our neighbour has
1492 * asked for it (callback for listening peer).
1493 *
1494 * @param cls the 'struct DirectNeighbor' of the peer we're building
1495 * a routing consensus with
1496 * @param other_peer the other peer
1497 * @param context_msg message with application specific information from
1498 * the other peer
1499 * @param request request from the other peer, use GNUNET_SET_accept
1500 * to accept it, otherwise the request will be refused
1501 * Note that we don't use a return value here, as it is also
1502 * necessary to specify the set we want to do the operation with,
1503 * whith sometimes can be derived from the context message.
1504 * Also necessary to specify the timeout.
1505 */
1506static void
1507listen_set_union (void *cls,
1508 const struct GNUNET_PeerIdentity *other_peer,
1509 const struct GNUNET_MessageHeader *context_msg,
1510 struct GNUNET_SET_Request *request)
1511{
1512 struct DirectNeighbor *neighbor = cls;
1513
1514 if (NULL == request)
1515 return; /* why??? */
1516 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1517 "Starting to create consensus with %s\n",
1518 GNUNET_i2s (&neighbor->peer));
1519 if (NULL != neighbor->set_op)
1520 {
1521 GNUNET_SET_operation_cancel (neighbor->set_op);
1522 neighbor->set_op = NULL;
1523 }
1524 if (NULL != neighbor->my_set)
1525 {
1526 GNUNET_SET_destroy (neighbor->my_set);
1527 neighbor->my_set = NULL;
1528 }
1529 neighbor->my_set = GNUNET_SET_create (cfg,
1530 GNUNET_SET_OPERATION_UNION);
1531 neighbor->set_op = GNUNET_SET_accept (request,
1532 GNUNET_SET_RESULT_ADDED,
1533 (struct GNUNET_SET_Option[]) {{ 0 }},
1534 &handle_set_union_result,
1535 neighbor);
1536 neighbor->consensus_insertion_offset = 0;
1537 neighbor->consensus_insertion_distance = 0;
1538 neighbor->consensus_elements = 0;
1539 build_set (neighbor);
1540}
1541
1542
1543/**
1544 * Start creating a new DV set union by initiating the connection.
1545 *
1546 * @param cls the `struct DirectNeighbor *` of the peer we're building
1547 * a routing consensus with
1548 */
1549static void
1550initiate_set_union (void *cls)
1551{
1552 struct DirectNeighbor *neighbor = cls;
1553
1554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1555 "Initiating SET union with peer `%s'\n",
1556 GNUNET_i2s (&neighbor->peer));
1557 neighbor->initiate_task = NULL;
1558 neighbor->my_set = GNUNET_SET_create (cfg,
1559 GNUNET_SET_OPERATION_UNION);
1560 neighbor->set_op = GNUNET_SET_prepare (&neighbor->peer,
1561 &neighbor->real_session_id,
1562 NULL,
1563 GNUNET_SET_RESULT_ADDED,
1564 (struct GNUNET_SET_Option[]) {{ 0 }},
1565 &handle_set_union_result,
1566 neighbor);
1567 neighbor->consensus_insertion_offset = 0;
1568 neighbor->consensus_insertion_distance = 0;
1569 neighbor->consensus_elements = 0;
1570 build_set (neighbor);
1571}
1572
1573
1574/**
1575 * Check that @a rm is well-formed.
1576 *
1577 * @param cls closure
1578 * @param rm the message
1579 * @return #GNUNET_OK if @a rm is well-formed.
1580 */
1581static int
1582check_dv_route_message (void *cls,
1583 const struct RouteMessage *rm)
1584{
1585 const struct GNUNET_MessageHeader *payload;
1586
1587 if (ntohs (rm->header.size) < sizeof (struct RouteMessage) + sizeof (struct GNUNET_MessageHeader))
1588 {
1589 GNUNET_break_op (0);
1590 return GNUNET_SYSERR;
1591 }
1592 payload = (const struct GNUNET_MessageHeader *) &rm[1];
1593 if (ntohs (rm->header.size) != sizeof (struct RouteMessage) + ntohs (payload->size))
1594 {
1595 GNUNET_break_op (0);
1596 return GNUNET_SYSERR;
1597 }
1598 return GNUNET_OK;
1599}
1600
1601
1602/**
1603 * Core handler for DV data messages. Whatever this message
1604 * contains all we really have to do is rip it out of its
1605 * DV layering and give it to our pal the DV plugin to report
1606 * in with.
1607 *
1608 * @param cls closure
1609 * @param rm the message
1610 */
1611static void
1612handle_dv_route_message (void *cls,
1613 const struct RouteMessage *rm)
1614{
1615 struct DirectNeighbor *neighbor = cls;
1616 const struct GNUNET_MessageHeader *payload;
1617 struct Route *route;
1618 struct DirectNeighbor *nneighbor;
1619 struct DirectNeighbor *dn;
1620 struct Target *target;
1621 uint32_t distance;
1622 char me[5];
1623 char src[5];
1624 char prev[5];
1625 char dst[5];
1626
1627 distance = ntohl (rm->distance);
1628 payload = (const struct GNUNET_MessageHeader *) &rm[1];
1629 strncpy (prev, GNUNET_i2s (&neighbor->peer), 4);
1630 strncpy (me, GNUNET_i2s (&my_identity), 4);
1631 strncpy (src, GNUNET_i2s (&rm->sender), 4);
1632 strncpy (dst, GNUNET_i2s (&rm->target), 4);
1633 prev[4] = me[4] = src[4] = dst[4] = '\0';
1634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1635 "Handling DV message with %u bytes payload of type %u from %s to %s routed by %s to me (%s @ hop %u)\n",
1636 (unsigned int) (ntohs (rm->header.size) - sizeof (struct RouteMessage)),
1637 ntohs (payload->type),
1638 src,
1639 dst,
1640 prev,
1641 me,
1642 (unsigned int) distance + 1);
1643
1644 if (0 == memcmp (&rm->target,
1645 &my_identity,
1646 sizeof (struct GNUNET_PeerIdentity)))
1647 {
1648 if ((NULL !=
1649 (dn = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1650 &rm->sender))) &&
1651 (DIRECT_NEIGHBOR_COST == dn->distance))
1652 {
1653 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1654 "Discarding DV message, as %s is a direct neighbor\n",
1655 GNUNET_i2s (&rm->sender));
1656 GNUNET_STATISTICS_update (stats,
1657 "# messages discarded (direct neighbor)",
1658 1, GNUNET_NO);
1659 return;
1660 }
1661 /* message is for me, check reverse route! */
1662 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1663 &rm->sender);
1664 if ( (NULL == route) &&
1665 (distance < DEFAULT_FISHEYE_DEPTH) )
1666 {
1667 /* don't have reverse route yet, learn it! */
1668 target = GNUNET_new (struct Target);
1669 target->peer = rm->sender;
1670 target->distance = htonl (distance);
1671 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1672 "Learning sender %s at distance %u from delivery!\n",
1673 GNUNET_i2s (&rm->sender),
1674 (unsigned int) distance + 1);
1675 if (NULL == neighbor->neighbor_table)
1676 neighbor->neighbor_table = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1677 if (GNUNET_YES !=
1678 GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table,
1679 &target->peer,
1680 target,
1681 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1682 {
1683 GNUNET_break_op (0);
1684 GNUNET_free (target);
1685 return;
1686 }
1687 add_new_route (target, neighbor);
1688 }
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "Delivering %u bytes from %s to myself!\n",
1691 ntohs (payload->size),
1692 GNUNET_i2s (&rm->sender));
1693 send_data_to_plugin (payload,
1694 &rm->sender,
1695 1 + distance);
1696 return;
1697 }
1698 if ( (NULL == GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1699 &rm->sender)) &&
1700 (NULL == GNUNET_CONTAINER_multipeermap_get (all_routes,
1701 &rm->sender)) )
1702 {
1703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1704 "Learning sender %s at distance %u from forwarding!\n",
1705 GNUNET_i2s (&rm->sender),
1706 1 + distance);
1707 target = GNUNET_new (struct Target);
1708 target->peer = rm->sender;
1709 target->distance = htonl (distance);
1710 if (NULL == neighbor->neighbor_table)
1711 neighbor->neighbor_table = GNUNET_CONTAINER_multipeermap_create (10, GNUNET_NO);
1712 if (GNUNET_YES !=
1713 GNUNET_CONTAINER_multipeermap_put (neighbor->neighbor_table,
1714 &target->peer,
1715 target,
1716 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1717 {
1718 GNUNET_break_op (0);
1719 GNUNET_free (target);
1720 return;
1721 }
1722 add_new_route (target, neighbor);
1723 }
1724
1725 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1726 &rm->target);
1727 if (NULL == route)
1728 {
1729 nneighbor = GNUNET_CONTAINER_multipeermap_get (direct_neighbors,
1730 &rm->target);
1731 if (NULL == nneighbor)
1732 {
1733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1734 "No route to %s, not routing %u bytes!\n",
1735 GNUNET_i2s (&rm->target),
1736 ntohs (payload->size));
1737 GNUNET_STATISTICS_update (stats,
1738 "# messages discarded (no route)",
1739 1, GNUNET_NO);
1740 return;
1741 }
1742 }
1743 else
1744 {
1745 nneighbor = route->next_hop;
1746 }
1747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1748 "Forwarding message to %s\n",
1749 GNUNET_i2s (&nneighbor->peer));
1750 forward_payload (nneighbor,
1751 distance + 1,
1752 &rm->sender,
1753 &rm->target,
1754 payload);
1755}
1756
1757
1758/**
1759 * Check that @a msg is well-formed
1760 *
1761 * @param cls identification of the client
1762 * @param message the actual message
1763 * @return #GNUNET_OK if @a msg is well-formed
1764 */
1765static int
1766check_dv_send_message (void *cls,
1767 const struct GNUNET_DV_SendMessage *msg)
1768{
1769 const struct GNUNET_MessageHeader *payload;
1770
1771 if (ntohs (msg->header.size) < sizeof (struct GNUNET_DV_SendMessage) +
1772 sizeof (struct GNUNET_MessageHeader))
1773 {
1774 GNUNET_break (0);
1775 return GNUNET_SYSERR;
1776 }
1777 payload = (const struct GNUNET_MessageHeader *) &msg[1];
1778 if (ntohs (msg->header.size) != sizeof (struct GNUNET_DV_SendMessage) + ntohs (payload->size))
1779 {
1780 GNUNET_break (0);
1781 return GNUNET_SYSERR;
1782 }
1783 return GNUNET_OK;
1784}
1785
1786
1787/**
1788 * Service server's handler for message send requests (which come
1789 * bubbling up to us through the DV plugin).
1790 *
1791 * @param cls identification of the client
1792 * @param message the actual message
1793 */
1794static void
1795handle_dv_send_message (void *cls,
1796 const struct GNUNET_DV_SendMessage *msg)
1797{
1798 struct GNUNET_SERVICE_Client *client = cls;
1799 struct Route *route;
1800 const struct GNUNET_MessageHeader *payload;
1801
1802 payload = (const struct GNUNET_MessageHeader *) &msg[1];
1803 route = GNUNET_CONTAINER_multipeermap_get (all_routes,
1804 &msg->target);
1805 if (NULL == route)
1806 {
1807 /* got disconnected */
1808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1809 "No route to %s, dropping local message of type %u\n",
1810 GNUNET_i2s (&msg->target),
1811 ntohs (payload->type));
1812 GNUNET_STATISTICS_update (stats,
1813 "# local messages discarded (no route)",
1814 1, GNUNET_NO);
1815 GNUNET_SERVICE_client_continue (client);
1816 return;
1817 }
1818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1819 "Forwarding %u bytes of type %u to %s\n",
1820 ntohs (payload->size),
1821 ntohs (payload->type),
1822 GNUNET_i2s (&msg->target));
1823
1824 forward_payload (route->next_hop,
1825 0 /* first hop, distance is zero */,
1826 &my_identity,
1827 &msg->target,
1828 payload);
1829 GNUNET_SERVICE_client_continue (client);
1830}
1831
1832
1833/**
1834 * Cleanup all of the data structures associated with a given neighbor.
1835 *
1836 * @param neighbor neighbor to clean up
1837 */
1838static void
1839cleanup_neighbor (struct DirectNeighbor *neighbor)
1840{
1841 handle_direct_disconnect (neighbor);
1842 GNUNET_assert (GNUNET_YES ==
1843 GNUNET_CONTAINER_multipeermap_remove (direct_neighbors,
1844 &neighbor->peer,
1845 neighbor));
1846 GNUNET_free (neighbor);
1847}
1848
1849
1850/**
1851 * Method called whenever a given peer disconnects.
1852 *
1853 * @param cls closure
1854 * @param peer peer identity this notification is about
1855 * @param internal_cls the corresponding `struct DirectNeighbor`
1856 */
1857static void
1858handle_core_disconnect (void *cls,
1859 const struct GNUNET_PeerIdentity *peer,
1860 void *internal_cls)
1861{
1862 struct DirectNeighbor *neighbor = internal_cls;
1863
1864 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1865 "Received core peer disconnect message for peer `%s'!\n",
1866 GNUNET_i2s (peer));
1867 /* Check for disconnect from self message */
1868 if (NULL == neighbor)
1869 return;
1870 GNUNET_break (GNUNET_YES == neighbor->connected);
1871 neighbor->connected = GNUNET_NO;
1872 if (DIRECT_NEIGHBOR_COST == neighbor->distance)
1873 {
1874 GNUNET_STATISTICS_update (stats,
1875 "# peers connected (1-hop)",
1876 -1,
1877 GNUNET_NO);
1878 }
1879 cleanup_neighbor (neighbor);
1880 if (GNUNET_YES == in_shutdown)
1881 return;
1882 schedule_refresh_routes ();
1883}
1884
1885
1886/**
1887 * Multipeermap iterator for freeing routes. Should never be called.
1888 *
1889 * @param cls NULL
1890 * @param key key value stored under
1891 * @param value the route to be freed
1892 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1893 */
1894static int
1895free_route (void *cls,
1896 const struct GNUNET_PeerIdentity *key,
1897 void *value)
1898{
1899 struct Route *route = value;
1900
1901 GNUNET_break (0);
1902 GNUNET_assert (GNUNET_YES ==
1903 GNUNET_CONTAINER_multipeermap_remove (all_routes, key, value));
1904 release_route (route);
1905 send_disconnect_to_plugin (&route->target.peer);
1906 GNUNET_free (route);
1907 return GNUNET_YES;
1908}
1909
1910
1911/**
1912 * Multipeermap iterator for freeing direct neighbors. Should never be called.
1913 *
1914 * @param cls NULL
1915 * @param key key value stored under
1916 * @param value the direct neighbor to be freed
1917 * @return #GNUNET_YES to continue iteration, #GNUNET_NO to stop
1918 */
1919static int
1920free_direct_neighbors (void *cls,
1921 const struct GNUNET_PeerIdentity *key,
1922 void *value)
1923{
1924 struct DirectNeighbor *neighbor = value;
1925
1926 cleanup_neighbor (neighbor);
1927 return GNUNET_YES;
1928}
1929
1930
1931/**
1932 * Task run during shutdown.
1933 *
1934 * @param cls unused
1935 */
1936static void
1937shutdown_task (void *cls)
1938{
1939 unsigned int i;
1940
1941 in_shutdown = GNUNET_YES;
1942 GNUNET_assert (NULL != core_api);
1943 GNUNET_CORE_disconnect (core_api);
1944 core_api = NULL;
1945 GNUNET_ATS_performance_done (ats);
1946 ats = NULL;
1947 GNUNET_CONTAINER_multipeermap_iterate (direct_neighbors,
1948 &free_direct_neighbors,
1949 NULL);
1950 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
1951 &free_route,
1952 NULL);
1953 GNUNET_CONTAINER_multipeermap_destroy (direct_neighbors);
1954 GNUNET_CONTAINER_multipeermap_destroy (all_routes);
1955 GNUNET_STATISTICS_destroy (stats, GNUNET_NO);
1956 stats = NULL;
1957 GNUNET_notification_context_destroy (nc);
1958 nc = NULL;
1959 for (i=0;i<DEFAULT_FISHEYE_DEPTH;i++)
1960 {
1961 GNUNET_array_grow (consensi[i].targets,
1962 consensi[i].array_length,
1963 0);
1964 }
1965 if (NULL != rr_task)
1966 {
1967 GNUNET_SCHEDULER_cancel (rr_task);
1968 rr_task = NULL;
1969 }
1970}
1971
1972
1973/**
1974 * Notify newly connected client about an existing route.
1975 *
1976 * @param cls the `struct GNUNET_SERVICE_Client *`
1977 * @param key peer identity
1978 * @param value the `struct Route *`
1979 * @return #GNUNET_OK (continue to iterate)
1980 */
1981static int
1982notify_client_about_route (void *cls,
1983 const struct GNUNET_PeerIdentity *key,
1984 void *value)
1985{
1986 struct GNUNET_SERVICE_Client *client = cls;
1987 struct Route *route = value;
1988 struct GNUNET_MQ_Envelope *env;
1989 struct GNUNET_DV_ConnectMessage *cm;
1990
1991 env = GNUNET_MQ_msg (cm,
1992 GNUNET_MESSAGE_TYPE_DV_CONNECT);
1993 cm->distance = htonl (route->target.distance);
1994 cm->peer = route->target.peer;
1995 GNUNET_MQ_send (GNUNET_SERVICE_client_get_mq (client),
1996 env);
1997 return GNUNET_OK;
1998}
1999
2000
2001/**
2002 * Handle START-message. This is the first message sent to us
2003 * by the client (can only be one!).
2004 *
2005 * @param cls closure (always NULL)
2006 * @param client identification of the client
2007 * @param message the actual message
2008 */
2009static void
2010handle_start (void *cls,
2011 const struct GNUNET_MessageHeader *message)
2012{
2013 struct GNUNET_SERVICE_Client *client = cls;
2014
2015 GNUNET_notification_context_add (nc,
2016 GNUNET_SERVICE_client_get_mq (client));
2017 GNUNET_SERVICE_client_continue (client);
2018 GNUNET_CONTAINER_multipeermap_iterate (all_routes,
2019 &notify_client_about_route,
2020 client);
2021}
2022
2023
2024/**
2025 * Called on core init.
2026 *
2027 * @param cls unused
2028 * @param identity this peer's identity
2029 */
2030static void
2031core_init (void *cls,
2032 const struct GNUNET_PeerIdentity *identity)
2033{
2034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2035 "I am peer: %s\n",
2036 GNUNET_i2s (identity));
2037 my_identity = *identity;
2038}
2039
2040
2041/**
2042 * Process dv requests.
2043 *
2044 * @param cls closure
2045 * @param c configuration to use
2046 * @param service the initialized service
2047 */
2048static void
2049run (void *cls,
2050 const struct GNUNET_CONFIGURATION_Handle *c,
2051 struct GNUNET_SERVICE_Handle *service)
2052{
2053 struct GNUNET_MQ_MessageHandler core_handlers[] = {
2054 GNUNET_MQ_hd_var_size (dv_route_message,
2055 GNUNET_MESSAGE_TYPE_DV_ROUTE,
2056 struct RouteMessage,
2057 NULL),
2058 GNUNET_MQ_handler_end ()
2059 };
2060 in_shutdown = GNUNET_NO;
2061 cfg = c;
2062 direct_neighbors = GNUNET_CONTAINER_multipeermap_create (128,
2063 GNUNET_NO);
2064 all_routes = GNUNET_CONTAINER_multipeermap_create (65536,
2065 GNUNET_NO);
2066 core_api = GNUNET_CORE_connect (cfg,
2067 NULL,
2068 &core_init,
2069 &handle_core_connect,
2070 &handle_core_disconnect,
2071 core_handlers);
2072
2073 if (NULL == core_api)
2074 return;
2075 ats = GNUNET_ATS_performance_init (cfg,
2076 &handle_ats_update,
2077 NULL);
2078 if (NULL == ats)
2079 {
2080 GNUNET_CORE_disconnect (core_api);
2081 core_api = NULL;
2082 return;
2083 }
2084 nc = GNUNET_notification_context_create (MAX_QUEUE_SIZE_PLUGIN);
2085 stats = GNUNET_STATISTICS_create ("dv",
2086 cfg);
2087 GNUNET_SCHEDULER_add_shutdown (&shutdown_task,
2088 NULL);
2089}
2090
2091
2092/**
2093 * Callback called when a client connects to the service.
2094 *
2095 * @param cls closure for the service
2096 * @param c the new client that connected to the service
2097 * @param mq the message queue used to send messages to the client
2098 * @return @a c
2099 */
2100static void *
2101client_connect_cb (void *cls,
2102 struct GNUNET_SERVICE_Client *c,
2103 struct GNUNET_MQ_Handle *mq)
2104{
2105 return c;
2106}
2107
2108
2109/**
2110 * Callback called when a client disconnected from the service
2111 *
2112 * @param cls closure for the service
2113 * @param c the client that disconnected
2114 * @param internal_cls should be equal to @a c
2115 */
2116static void
2117client_disconnect_cb (void *cls,
2118 struct GNUNET_SERVICE_Client *c,
2119 void *internal_cls)
2120{
2121 GNUNET_assert (c == internal_cls);
2122}
2123
2124
2125/**
2126 * Define "main" method using service macro.
2127 */
2128GNUNET_SERVICE_MAIN
2129("dv",
2130 GNUNET_SERVICE_OPTION_NONE,
2131 &run,
2132 &client_connect_cb,
2133 &client_disconnect_cb,
2134 NULL,
2135 GNUNET_MQ_hd_fixed_size (start,
2136 GNUNET_MESSAGE_TYPE_DV_START,
2137 struct GNUNET_MessageHeader,
2138 NULL),
2139 GNUNET_MQ_hd_var_size (dv_send_message,
2140 GNUNET_MESSAGE_TYPE_DV_SEND,
2141 struct GNUNET_DV_SendMessage,
2142 NULL),
2143 GNUNET_MQ_handler_end ());
2144
2145
2146/* end of gnunet-service-dv.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 04:48:59 +0000