2 This file is part of GNUnet.
3 (C) 2009 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
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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.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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
32 #include "gnunet_client_lib.h"
33 #include "gnunet_getopt_lib.h"
34 #include "gnunet_os_lib.h"
35 #include "gnunet_protocols.h"
36 #include "gnunet_service_lib.h"
37 #include "gnunet_core_service.h"
38 #include "gnunet_signal_lib.h"
39 #include "gnunet_util_lib.h"
40 #include "gnunet_hello_lib.h"
41 #include "gnunet_peerinfo_service.h"
42 #include "gnunet_crypto_lib.h"
43 #include "gnunet_statistics_service.h"
47 * For testing mostly, remember only the
48 * shortest path to a distant neighbor.
50 #define AT_MOST_ONE GNUNET_NO
52 #define USE_PEER_ID GNUNET_YES
55 * How many outstanding messages (unknown sender) will we allow per peer?
57 #define MAX_OUTSTANDING_MESSAGES 5
60 * How often do we check about sending out more peer information (if
61 * we are connected to no peers previously).
63 #define GNUNET_DV_DEFAULT_SEND_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500000)
66 * How long do we wait at most between sending out information?
68 #define GNUNET_DV_MAX_SEND_INTERVAL GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 500000)
71 * How long can we have not heard from a peer and
72 * still have it in our tables?
74 #define GNUNET_DV_PEER_EXPIRATION_TIME GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 1000))
77 * Priority for gossip.
79 #define GNUNET_DV_DHT_GOSSIP_PRIORITY (GNUNET_EXTREME_PRIORITY / 10)
82 * How often should we check if expiration time has elapsed for
85 #define GNUNET_DV_MAINTAIN_FREQUENCY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5))
88 * How long to allow a message to be delayed?
90 #define DV_DELAY GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5))
93 * Priority to use for DV data messages.
98 * The cost to a direct neighbor. We used to use 0, but 1 makes more sense.
100 #define DIRECT_NEIGHBOR_COST 1
103 * The default number of direct connections to store in DV (max)
105 #define DEFAULT_DIRECT_CONNECTIONS 50
108 * The default size of direct + extended peers in DV (max)
110 #define DEFAULT_DV_SIZE 100
113 * The default fisheye depth, from how many hops away will
116 #define DEFAULT_FISHEYE_DEPTH 4
119 * Linked list of messages to send to clients.
121 struct PendingMessage
124 * Pointer to next item in the list
126 struct PendingMessage *next;
129 * Pointer to previous item in the list
131 struct PendingMessage *prev;
134 * The PeerIdentity to send to
136 struct GNUNET_PeerIdentity recipient;
139 * The result of message sending.
141 struct GNUNET_DV_SendResultMessage *send_result;
144 * Message importance level.
146 unsigned int importance;
151 unsigned int msg_size;
154 * How long to wait before sending message.
156 struct GNUNET_TIME_Relative timeout;
159 * Actual message to be sent; // avoid allocation
161 const struct GNUNET_MessageHeader *msg; // msg = (cast) &pm[1]; // memcpy (&pm[1], data, len);
165 struct FastGossipNeighborList
168 * Next element of DLL
170 struct FastGossipNeighborList *next;
173 * Prev element of DLL
175 struct FastGossipNeighborList *prev;
178 * The neighbor to gossip about
180 struct DistantNeighbor *about;
184 * Context created whenever a direct peer connects to us,
185 * used to gossip other peers to it.
187 struct NeighborSendContext
190 * The peer we will gossip to.
192 struct DirectNeighbor *toNeighbor;
195 * The task associated with this context.
197 GNUNET_SCHEDULER_TaskIdentifier task;
200 * Head of DLL of peers to gossip about
201 * as fast as possible to this peer, for initial
204 struct FastGossipNeighborList *fast_gossip_list_head;
207 * Tail of DLL of peers to gossip about
208 * as fast as possible to this peer, for initial
211 struct FastGossipNeighborList *fast_gossip_list_tail;
217 * Struct to hold information for updating existing neighbors
219 struct NeighborUpdateInfo
227 * The existing neighbor
229 struct DistantNeighbor *neighbor;
232 * The referrer of the possibly existing peer
234 struct DirectNeighbor *referrer;
237 * The time we heard about this peer
239 struct GNUNET_TIME_Absolute now;
242 * Peer id this peer uses to refer to neighbor.
244 unsigned int referrer_peer_id;
249 * Struct to store a single message received with
252 struct UnknownSenderMessage
255 * Message sender (immediate)
257 struct GNUNET_PeerIdentity sender;
260 * The actual message received
262 struct GNUNET_MessageHeader *message;
265 * Latency of connection
267 struct GNUNET_TIME_Relative latency;
270 * Distance to destination
281 * Struct where actual neighbor information is stored,
282 * referenced by min_heap and max_heap. Freeing dealt
283 * with when items removed from hashmap.
285 struct DirectNeighbor
288 * Identity of neighbor.
290 struct GNUNET_PeerIdentity identity;
293 * PublicKey of neighbor.
295 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded pkey;
298 * Head of DLL of nodes that this direct neighbor referred to us.
300 struct DistantNeighbor *referee_head;
303 * Tail of DLL of nodes that this direct neighbor referred to us.
305 struct DistantNeighbor *referee_tail;
308 * The sending context for gossiping peers to this neighbor.
310 struct NeighborSendContext *send_context;
313 * Is this one of the direct neighbors that we are "hiding"
319 * Save messages immediately from this direct neighbor from a
320 * distan peer we don't know on the chance that it will be
321 * gossiped about and we can deliver the message.
323 struct UnknownSenderMessage pending_messages[MAX_OUTSTANDING_MESSAGES];
328 * Struct where actual neighbor information is stored,
329 * referenced by min_heap and max_heap. Freeing dealt
330 * with when items removed from hashmap.
332 struct DistantNeighbor
335 * We keep distant neighbor's of the same referrer in a DLL.
337 struct DistantNeighbor *next;
340 * We keep distant neighbor's of the same referrer in a DLL.
342 struct DistantNeighbor *prev;
347 struct GNUNET_CONTAINER_HeapNode *min_loc;
352 struct GNUNET_CONTAINER_HeapNode *max_loc;
355 * Identity of referrer (next hop towards 'neighbor').
357 struct DirectNeighbor *referrer;
360 * Identity of neighbor.
362 struct GNUNET_PeerIdentity identity;
365 * PublicKey of neighbor.
367 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey;
370 * Last time we received routing information from this peer
372 struct GNUNET_TIME_Absolute last_activity;
375 * Last time we sent routing information about this peer
377 struct GNUNET_TIME_Absolute last_gossip;
380 * Cost to neighbor, used for actual distance vector computations
385 * Random identifier *we* use for this peer, to be used as shortcut
386 * instead of sending full peer id for each message
391 * Random identifier the *referrer* uses for this peer.
393 unsigned int referrer_id;
396 * Is this one of the direct neighbors that we are "hiding"
403 struct PeerIteratorContext
406 * The actual context, to be freed later.
408 struct GNUNET_PEERINFO_IteratorContext *ic;
411 * The neighbor about which we are concerned.
413 struct DirectNeighbor *neighbor;
416 * The distant neighbor entry for this direct neighbor.
418 struct DistantNeighbor *distant;
423 * Context used for creating hello messages when
424 * gossips are received.
429 * Identity of distant neighbor.
431 struct GNUNET_PeerIdentity distant_peer;
434 * Identity of direct neighbor, via which we send this message.
436 const struct GNUNET_PeerIdentity *direct_peer;
439 * How many addresses do we need to add (always starts at 1, then set to 0)
441 int addresses_to_add;
445 struct DV_SendContext
448 * The distant peer (should always match)
450 struct GNUNET_PeerIdentity *distant_peer;
453 * The direct peer, we need to verify the referrer of.
455 struct GNUNET_PeerIdentity *direct_peer;
458 * The message to be sent
460 struct GNUNET_MessageHeader *message;
463 * The pre-built send result message. Simply needs to be queued
464 * and freed once send has been called!
466 struct GNUNET_DV_SendResultMessage *send_result;
469 * The size of the message being sent, may be larger
470 * than message->header.size because it's multiple
471 * messages packed into one!
476 * How important is this message?
478 unsigned int importance;
481 * Timeout for this message
483 struct GNUNET_TIME_Relative timeout;
486 * Unique ID for DV message
491 struct FindDestinationContext
494 struct DistantNeighbor *dest;
500 struct GNUNET_PeerIdentity *dest;
501 const struct GNUNET_PeerIdentity *via;
504 struct DisconnectContext
507 * Distant neighbor to get pid from.
509 struct DistantNeighbor *distant;
512 * Direct neighbor that disconnected.
514 struct DirectNeighbor *direct;
517 struct TokenizedMessageContext
520 * Immediate sender of this message
522 const struct GNUNET_PeerIdentity *peer;
525 * Distant sender of the message
527 struct DistantNeighbor *distant;
530 * Uid for this set of messages
536 * Context for finding the least cost peer to send to.
537 * Transport selection can only go so far.
539 struct FindLeastCostContext
541 struct DistantNeighbor *target;
542 unsigned int least_cost;
546 * Handle to the core service api.
548 static struct GNUNET_CORE_Handle *coreAPI;
551 * Stream tokenizer to handle messages coming in from core.
553 static struct GNUNET_SERVER_MessageStreamTokenizer *coreMST;
556 * The identity of our peer.
558 static struct GNUNET_PeerIdentity my_identity;
561 * The configuration for this service.
563 static const struct GNUNET_CONFIGURATION_Handle *cfg;
567 * The client, the DV plugin connected to us. Hopefully
568 * this client will never change, although if the plugin dies
569 * and returns for some reason it may happen.
571 static struct GNUNET_SERVER_Client * client_handle;
574 * Task to run when we shut down, cleaning up all our trash
576 static GNUNET_SCHEDULER_TaskIdentifier cleanup_task;
578 static size_t default_dv_priority = 0;
580 static char *my_short_id;
583 * Transmit handle to the plugin.
585 static struct GNUNET_CONNECTION_TransmitHandle * plugin_transmit_handle;
588 * Head of DLL for client messages
590 static struct PendingMessage *plugin_pending_head;
593 * Tail of DLL for client messages
595 static struct PendingMessage *plugin_pending_tail;
598 * Handle to the peerinfo service
600 static struct GNUNET_PEERINFO_Handle *peerinfo_handle;
603 * Transmit handle to core service.
605 static struct GNUNET_CORE_TransmitHandle * core_transmit_handle;
608 * Head of DLL for core messages
610 static struct PendingMessage *core_pending_head;
613 * Tail of DLL for core messages
615 static struct PendingMessage *core_pending_tail;
618 * Map of PeerIdentifiers to 'struct GNUNET_dv_neighbor*'s for all
619 * directly connected peers.
621 static struct GNUNET_CONTAINER_MultiHashMap *direct_neighbors;
624 * Map of PeerIdentifiers to 'struct GNUNET_dv_neighbor*'s for
625 * peers connected via DV (extended neighborhood). Does ALSO
626 * include any peers that are in 'direct_neighbors'; for those
627 * peers, the cost will be zero and the referrer all zeros.
629 static struct GNUNET_CONTAINER_MultiHashMap *extended_neighbors;
632 * We use the min heap (min refers to cost) to prefer
633 * gossipping about peers with small costs.
635 static struct GNUNET_CONTAINER_Heap *neighbor_min_heap;
638 * We use the max heap (max refers to cost) for general
639 * iterations over all peers and to remove the most costly
640 * connection if we have too many.
642 static struct GNUNET_CONTAINER_Heap *neighbor_max_heap;
645 * Handle for the statistics service.
647 struct GNUNET_STATISTICS_Handle *stats;
650 * How far out to keep peers we learn about.
652 static unsigned long long fisheye_depth;
655 * How many peers to store at most.
657 static unsigned long long max_table_size;
660 * We've been given a target ID based on the random numbers that
661 * we assigned to our DV-neighborhood. Find the entry for the
662 * respective neighbor.
665 find_destination (void *cls,
666 struct GNUNET_CONTAINER_HeapNode *node,
667 void *element, GNUNET_CONTAINER_HeapCostType cost)
669 struct FindDestinationContext *fdc = cls;
670 struct DistantNeighbor *dn = element;
672 if (fdc->tid != dn->our_id)
680 * We've been given a target ID based on the random numbers that
681 * we assigned to our DV-neighborhood. Find the entry for the
682 * respective neighbor.
685 find_specific_id (void *cls,
686 const GNUNET_HashCode *key,
689 struct FindIDContext *fdc = cls;
690 struct DistantNeighbor *dn = value;
692 if (memcmp(&dn->referrer->identity, fdc->via, sizeof(struct GNUNET_PeerIdentity)) == 0)
694 fdc->tid = dn->referrer_id;
701 * Find a distant peer whose referrer_id matches what we're
702 * looking for. For looking up a peer we've gossipped about
703 * but is now disconnected. Need to do this because we don't
704 * want to remove those that may be accessible via a different
707 static int find_distant_peer (void *cls,
708 const GNUNET_HashCode * key,
711 struct FindDestinationContext *fdc = cls;
712 struct DistantNeighbor *distant = value;
714 if (fdc->tid == distant->referrer_id)
723 * Function called to notify a client about the socket
724 * begin ready to queue more data. "buf" will be
725 * NULL and "size" zero if the socket was closed for
726 * writing in the meantime.
729 * @param size number of bytes available in buf
730 * @param buf where the callee should write the message
731 * @return number of bytes written to buf
733 size_t transmit_to_plugin (void *cls,
734 size_t size, void *buf)
737 struct PendingMessage *reply;
743 /* client disconnected */
744 #if DEBUG_DV_MESSAGES
745 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s: %s buffer was NULL (client disconnect?)\n", my_short_id, "transmit_to_plugin");
749 plugin_transmit_handle = NULL;
751 while ( (NULL != (reply = plugin_pending_head)) &&
752 (size >= off + (msize = ntohs (reply->msg->size))))
754 GNUNET_CONTAINER_DLL_remove (plugin_pending_head,
757 memcpy (&cbuf[off], reply->msg, msize);
762 if (plugin_pending_head != NULL)
763 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
764 ntohs(plugin_pending_head->msg->size),
765 GNUNET_TIME_UNIT_FOREVER_REL,
766 &transmit_to_plugin, NULL);
772 * Send a message to the dv plugin.
774 * @param sender the direct sender of the message
775 * @param message the message to send to the plugin
776 * (may be an encapsulated type)
777 * @param message_size the size of the message to be sent
778 * @param distant_neighbor the original sender of the message
779 * @param cost the cost to the original sender of the message
781 void send_to_plugin(const struct GNUNET_PeerIdentity * sender,
782 const struct GNUNET_MessageHeader *message,
784 struct GNUNET_PeerIdentity *distant_neighbor,
787 struct GNUNET_DV_MessageReceived *received_msg;
788 struct PendingMessage *pending_message;
789 char *sender_address;
790 size_t sender_address_len;
791 char *packed_msg_start;
795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_to_plugin called with peer %s as sender\n", GNUNET_i2s(distant_neighbor));
798 if (memcmp(sender, distant_neighbor, sizeof(struct GNUNET_PeerIdentity)) != 0)
800 sender_address_len = sizeof(struct GNUNET_PeerIdentity) * 2;
801 sender_address = GNUNET_malloc(sender_address_len);
802 memcpy(sender_address, distant_neighbor, sizeof(struct GNUNET_PeerIdentity));
803 memcpy(&sender_address[sizeof(struct GNUNET_PeerIdentity)], sender, sizeof(struct GNUNET_PeerIdentity));
807 sender_address_len = sizeof(struct GNUNET_PeerIdentity);
808 sender_address = GNUNET_malloc(sender_address_len);
809 memcpy(sender_address, sender, sizeof(struct GNUNET_PeerIdentity));
812 size = sizeof(struct GNUNET_DV_MessageReceived) + sender_address_len + message_size;
813 received_msg = GNUNET_malloc(size);
814 received_msg->header.size = htons(size);
815 received_msg->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_DV_RECEIVE);
816 received_msg->distance = htonl(cost);
817 received_msg->msg_len = htonl(message_size);
818 /* Set the sender in this message to be the original sender! */
819 memcpy(&received_msg->sender, distant_neighbor, sizeof(struct GNUNET_PeerIdentity));
820 /* Copy the intermediate sender to the end of the message, this is how the transport identifies this peer */
821 memcpy(&received_msg[1], sender_address, sender_address_len);
822 GNUNET_free(sender_address);
823 /* Copy the actual message after the sender */
824 packed_msg_start = (char *)&received_msg[1];
825 packed_msg_start = &packed_msg_start[sender_address_len];
826 memcpy(packed_msg_start, message, message_size);
827 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + size);
828 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
829 memcpy(&pending_message[1], received_msg, size);
830 GNUNET_free(received_msg);
832 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, pending_message);
834 if (client_handle != NULL)
836 if (plugin_transmit_handle == NULL)
838 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
839 size, GNUNET_TIME_UNIT_FOREVER_REL,
840 &transmit_to_plugin, NULL);
845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, client_handle not yet set (how?)!\n");
849 /* Declare here so retry_core_send is aware of it */
850 size_t core_transmit_notify (void *cls,
851 size_t size, void *buf);
854 * Try to send another message from our core sending list
857 try_core_send (void *cls,
858 const struct GNUNET_SCHEDULER_TaskContext *tc)
860 struct PendingMessage *pending;
861 pending = core_pending_head;
863 if (core_transmit_handle != NULL)
864 return; /* Message send already in progress */
866 if ((pending != NULL) && (coreAPI != NULL))
867 core_transmit_handle = GNUNET_CORE_notify_transmit_ready (coreAPI,
873 &core_transmit_notify, NULL);
878 * Function called to notify a client about the socket
879 * being ready to queue more data. "buf" will be
880 * NULL and "size" zero if the socket was closed for
881 * writing in the meantime.
883 * @param cls closure (NULL)
884 * @param size number of bytes available in buf
885 * @param buf where the callee should write the message
886 * @return number of bytes written to buf
888 size_t core_transmit_notify (void *cls,
889 size_t size, void *buf)
892 struct PendingMessage *pending;
893 struct PendingMessage *client_reply;
899 /* client disconnected */
901 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "`%s': buffer was NULL\n", "DHT");
906 core_transmit_handle = NULL;
908 pending = core_pending_head;
909 if ( (pending != NULL) &&
910 (size >= (msize = ntohs (pending->msg->size))))
913 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "`%s' : transmit_notify (core) called with size %d\n", "dv service", msize);
915 GNUNET_CONTAINER_DLL_remove (core_pending_head,
918 if (pending->send_result != NULL) /* Will only be non-null if a real client asked for this send */
920 client_reply = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
921 client_reply->msg = (struct GNUNET_MessageHeader *)&client_reply[1];
922 memcpy(&client_reply[1], pending->send_result, sizeof(struct GNUNET_DV_SendResultMessage));
923 GNUNET_free(pending->send_result);
925 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, client_reply);
926 if (client_handle != NULL)
928 if (plugin_transmit_handle == NULL)
930 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
931 sizeof(struct GNUNET_DV_SendResultMessage),
932 GNUNET_TIME_UNIT_FOREVER_REL,
933 &transmit_to_plugin, NULL);
937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
941 memcpy (&cbuf[off], pending->msg, msize);
942 GNUNET_free (pending);
945 /*reply = core_pending_head;*/
947 GNUNET_SCHEDULER_add_now(&try_core_send, NULL);
949 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, GNUNET_YES, reply->importance, reply->timeout, &reply->recipient, reply->msg_size, &core_transmit_notify, NULL);*/
956 * Send a DV data message via DV.
958 * @param sender the original sender of the message
959 * @param recipient the next hop recipient, may be our direct peer, maybe not
960 * @param send_context the send context
963 send_message_via (const struct GNUNET_PeerIdentity *sender,
964 const struct GNUNET_PeerIdentity *recipient,
965 struct DV_SendContext *send_context)
967 p2p_dv_MESSAGE_Data *toSend;
968 unsigned int msg_size;
969 unsigned int recipient_id;
970 unsigned int sender_id;
971 struct DistantNeighbor *source;
972 struct PendingMessage *pending_message;
973 struct FindIDContext find_context;
978 msg_size = send_context->message_size + sizeof (p2p_dv_MESSAGE_Data);
980 find_context.dest = send_context->distant_peer;
981 find_context.via = recipient;
982 find_context.tid = 0;
983 GNUNET_CONTAINER_multihashmap_get_multiple (extended_neighbors, &send_context->distant_peer->hashPubKey,
984 &find_specific_id, &find_context);
986 if (find_context.tid == 0)
988 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: find_specific_id failed to find peer!\n", my_short_id);
989 /* target unknown to us, drop! */
990 return GNUNET_SYSERR;
992 recipient_id = find_context.tid;
994 if (0 == (memcmp (&my_identity,
995 sender, sizeof (struct GNUNET_PeerIdentity))))
998 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
999 &sender->hashPubKey);
1001 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: send_message_via found %s, myself in extended peer list???\n", my_short_id, GNUNET_i2s(&source->identity));
1005 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
1006 &sender->hashPubKey);
1009 /* sender unknown to us, drop! */
1010 return GNUNET_SYSERR;
1012 sender_id = source->our_id;
1015 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + msg_size);
1016 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1017 pending_message->send_result = send_context->send_result;
1018 memcpy(&pending_message->recipient, recipient, sizeof(struct GNUNET_PeerIdentity));
1019 pending_message->msg_size = msg_size;
1020 pending_message->importance = send_context->importance;
1021 pending_message->timeout = send_context->timeout;
1022 toSend = (p2p_dv_MESSAGE_Data *)pending_message->msg;
1023 toSend->header.size = htons (msg_size);
1024 toSend->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DATA);
1025 toSend->sender = htonl (sender_id);
1026 toSend->recipient = htonl (recipient_id);
1027 #if DEBUG_DV_MESSAGES
1028 toSend->uid = send_context->uid; /* Still sent around in network byte order */
1030 toSend->uid = htonl(0);
1033 memcpy (&toSend[1], send_context->message, send_context->message_size);
1036 memcpy(&shortname, GNUNET_i2s(send_context->distant_peer), 4);
1037 shortname[4] = '\0';
1038 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Notifying core of send to destination `%s' via `%s' size %u\n", "DV", &shortname, GNUNET_i2s(recipient), msg_size);
1041 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1046 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1052 * Given a FindLeastCostContext, and a set
1053 * of peers that match the target, return the cheapest.
1055 * @param cls closure, a struct FindLeastCostContext
1056 * @param key the key identifying the target peer
1057 * @param value the target peer
1059 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1062 find_least_cost_peer (void *cls,
1063 const GNUNET_HashCode *key,
1066 struct FindLeastCostContext *find_context = cls;
1067 struct DistantNeighbor *dn = value;
1069 if (dn->cost < find_context->least_cost)
1071 find_context->target = dn;
1073 if (dn->cost == DIRECT_NEIGHBOR_COST)
1079 * Send a DV data message via DV.
1081 * @param recipient the ultimate recipient of this message
1082 * @param sender the original sender of the message
1083 * @param specific_neighbor the specific neighbor to send this message via
1084 * @param message the packed message
1085 * @param message_size size of the message
1086 * @param importance what priority to send this message with
1087 * @param uid the unique identifier of this message (or 0 for none)
1088 * @param timeout how long to possibly delay sending this message
1091 send_message (const struct GNUNET_PeerIdentity * recipient,
1092 const struct GNUNET_PeerIdentity * sender,
1093 const struct DistantNeighbor * specific_neighbor,
1094 const struct GNUNET_MessageHeader * message,
1095 size_t message_size,
1096 unsigned int importance,
1098 struct GNUNET_TIME_Relative timeout)
1100 p2p_dv_MESSAGE_Data *toSend;
1101 unsigned int msg_size;
1103 unsigned int recipient_id;
1104 unsigned int sender_id;
1105 struct DistantNeighbor *target;
1106 struct DistantNeighbor *source;
1107 struct PendingMessage *pending_message;
1108 struct FindLeastCostContext find_least_ctx;
1109 #if DEBUG_DV_PEER_NUMBERS
1110 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerFrom;
1111 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerTo;
1112 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerVia;
1114 msg_size = message_size + sizeof (p2p_dv_MESSAGE_Data);
1116 find_least_ctx.least_cost = -1;
1117 find_least_ctx.target = NULL;
1119 * Need to find the least cost peer, lest the transport selection keep
1120 * picking the same DV route for the same destination which results
1121 * in messages looping forever. Relatively cheap, we don't iterate
1122 * over all known peers, just those that apply.
1124 GNUNET_CONTAINER_multihashmap_get_multiple (extended_neighbors,
1125 &recipient->hashPubKey, &find_least_cost_peer, &find_least_ctx);
1126 target = find_least_ctx.target;
1130 /* target unknown to us, drop! */
1131 return GNUNET_SYSERR;
1133 recipient_id = target->referrer_id;
1135 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
1136 &sender->hashPubKey);
1139 if (0 != (memcmp (&my_identity,
1140 sender, sizeof (struct GNUNET_PeerIdentity))))
1142 /* sender unknown to us, drop! */
1143 return GNUNET_SYSERR;
1145 sender_id = 0; /* 0 == us */
1149 /* find out the number that we use when we gossip about
1151 sender_id = source->our_id;
1154 #if DEBUG_DV_PEER_NUMBERS
1155 GNUNET_CRYPTO_hash_to_enc (&source->identity.hashPubKey, &encPeerFrom);
1156 GNUNET_CRYPTO_hash_to_enc (&target->referrer->identity.hashPubKey, &encPeerVia);
1157 encPeerFrom.encoding[4] = '\0';
1158 encPeerVia.encoding[4] = '\0';
1160 if ((sender_id != 0) && (0 == memcmp(&source->identity, &target->referrer->identity, sizeof(struct GNUNET_PeerIdentity))))
1165 cost = target->cost;
1166 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + msg_size);
1167 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1168 pending_message->send_result = NULL;
1169 pending_message->importance = importance;
1170 pending_message->timeout = timeout;
1171 memcpy(&pending_message->recipient, &target->referrer->identity, sizeof(struct GNUNET_PeerIdentity));
1172 pending_message->msg_size = msg_size;
1173 toSend = (p2p_dv_MESSAGE_Data *)pending_message->msg;
1174 toSend->header.size = htons (msg_size);
1175 toSend->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DATA);
1176 toSend->sender = htonl (sender_id);
1177 toSend->recipient = htonl (recipient_id);
1178 #if DEBUG_DV_MESSAGES
1179 toSend->uid = htonl(uid);
1181 toSend->uid = htonl(0);
1184 #if DEBUG_DV_PEER_NUMBERS
1185 GNUNET_CRYPTO_hash_to_enc (&target->identity.hashPubKey, &encPeerTo);
1186 encPeerTo.encoding[4] = '\0';
1187 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Sending DATA message. Sender id %u, source %s, destination %s, via %s\n", GNUNET_i2s(&my_identity), sender_id, &encPeerFrom, &encPeerTo, &encPeerVia);
1189 memcpy (&toSend[1], message, message_size);
1190 if ((source != NULL) && (source->pkey == NULL)) /* Test our hypothesis about message failures! */
1192 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: Sending message, but anticipate recipient will not know sender!!!\n\n\n", my_short_id);
1194 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1199 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Notifying core of send size %d to destination `%s'\n", "DV SEND MESSAGE", msg_size, GNUNET_i2s(recipient));
1202 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1207 struct CheckPeerContext
1212 struct DistantNeighbor *peer;
1215 * Sender id to search for
1217 unsigned int sender_id;
1221 * Iterator over hash map entries.
1223 * @param cls closure
1224 * @param key current key code
1225 * @param value value in the hash map
1226 * @return GNUNET_YES if we should continue to
1230 int checkPeerID (void *cls,
1231 const GNUNET_HashCode * key,
1234 struct CheckPeerContext *ctx = cls;
1235 struct DistantNeighbor *distant = value;
1237 if (memcmp(key, &ctx->sender_id, sizeof(unsigned int)) == 0)
1239 ctx->peer = distant;
1249 * Handler for messages parsed out by the tokenizer from
1250 * DV DATA received for this peer.
1253 * @param client the TokenizedMessageContext which contains message information
1254 * @param message the actual message
1256 void tokenized_message_handler (void *cls,
1258 const struct GNUNET_MessageHeader *message)
1260 struct TokenizedMessageContext *ctx = client;
1261 GNUNET_break_op (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_GOSSIP);
1262 GNUNET_break_op (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_DATA);
1263 if ( (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_GOSSIP) &&
1264 (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_DATA) )
1266 #if DEBUG_DV_MESSAGES
1267 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1268 "%s: Receives %s message for me, uid %u, size %d, type %d cost %u from %s!\n", my_short_id, "DV DATA", ctx->uid, ntohs(message->size), ntohs(message->type), ctx->distant->cost, GNUNET_i2s(&ctx->distant->identity));
1270 GNUNET_assert(memcmp(ctx->peer, &ctx->distant->identity, sizeof(struct GNUNET_PeerIdentity)) != 0);
1271 send_to_plugin(ctx->peer, message, ntohs(message->size), &ctx->distant->identity, ctx->distant->cost);
1276 struct DelayedMessageContext
1278 struct GNUNET_PeerIdentity dest;
1279 struct GNUNET_PeerIdentity sender;
1280 struct GNUNET_MessageHeader *message;
1281 size_t message_size;
1285 void send_message_delayed (void *cls,
1286 const struct GNUNET_SCHEDULER_TaskContext *tc)
1288 struct DelayedMessageContext *msg_ctx = cls;
1289 if (msg_ctx != NULL)
1291 send_message(&msg_ctx->dest,
1295 msg_ctx->message_size,
1296 default_dv_priority,
1298 GNUNET_TIME_relative_get_forever());
1299 GNUNET_free(msg_ctx->message);
1300 GNUNET_free(msg_ctx);
1306 * Get distance information from 'atsi'.
1308 * @param atsi performance data
1309 * @return connected transport distance
1312 get_atsi_distance (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1314 while ( (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
1315 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE) )
1317 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
1320 /* FIXME: we do not have distance data? Assume direct neighbor. */
1321 return DIRECT_NEIGHBOR_COST;
1323 return ntohl (atsi->value);
1327 * Find latency information in 'atsi'.
1329 * @param atsi performance data
1330 * @return connection latency
1332 static struct GNUNET_TIME_Relative
1333 get_atsi_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1335 while ( (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
1336 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY) )
1338 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
1341 /* how can we not have latency data? */
1342 return GNUNET_TIME_UNIT_SECONDS;
1344 /* FIXME: Multiply by GNUNET_TIME_UNIT_MILLISECONDS (1) to get as a GNUNET_TIME_Relative */
1345 return GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, ntohl (atsi->value));
1349 * Core handler for dv data messages. Whatever this message
1350 * contains all we really have to do is rip it out of its
1351 * DV layering and give it to our pal the DV plugin to report
1354 * @param cls closure
1355 * @param peer peer which sent the message (immediate sender)
1356 * @param message the message
1357 * @param atsi transport ATS information (latency, distance, etc.)
1360 handle_dv_data_message (void *cls,
1361 const struct GNUNET_PeerIdentity * peer,
1362 const struct GNUNET_MessageHeader * message,
1363 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1365 const p2p_dv_MESSAGE_Data *incoming = (const p2p_dv_MESSAGE_Data *) message;
1366 const struct GNUNET_MessageHeader *packed_message;
1367 struct DirectNeighbor *dn;
1368 struct DistantNeighbor *pos;
1369 unsigned int sid; /* Sender id */
1370 unsigned int tid; /* Target id */
1371 struct GNUNET_PeerIdentity *original_sender;
1372 struct GNUNET_PeerIdentity *destination;
1373 struct FindDestinationContext fdc;
1374 struct TokenizedMessageContext tkm_ctx;
1378 struct DelayedMessageContext *delayed_context;
1381 struct CheckPeerContext checkPeerCtx;
1383 #if DEBUG_DV_MESSAGES
1387 size_t packed_message_size;
1389 uint32_t distance; /* Distance information */
1390 struct GNUNET_TIME_Relative latency; /* Latency information */
1392 packed_message_size = ntohs(incoming->header.size) - sizeof(p2p_dv_MESSAGE_Data);
1394 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1395 "%s: Receives DATA message from %s size %d, packed size %d!\n", my_short_id, GNUNET_i2s(peer) , ntohs(incoming->header.size), packed_message_size);
1398 if (ntohs (incoming->header.size) < sizeof (p2p_dv_MESSAGE_Data) + sizeof (struct GNUNET_MessageHeader))
1401 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1402 "`%s': Message sizes don't add up, total size %u, expected at least %u!\n", "dv service", ntohs(incoming->header.size), sizeof (p2p_dv_MESSAGE_Data) + sizeof (struct GNUNET_MessageHeader));
1404 return GNUNET_SYSERR;
1407 /* Iterate over ATS_Information to get distance and latency */
1408 latency = get_atsi_latency(atsi);
1409 distance = get_atsi_distance(atsi);
1410 dn = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
1415 sid = ntohl (incoming->sender);
1419 checkPeerCtx.sender_id = sid;
1420 checkPeerCtx.peer = NULL;
1421 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &checkPeerID, &checkPeerCtx);
1422 pos = checkPeerCtx.peer;
1426 pos = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
1430 pos = dn->referee_head;
1431 while ((NULL != pos) && (pos->referrer_id != sid))
1437 #if DEBUG_DV_MESSAGES
1438 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1439 "%s: unknown sender (%u), Message uid %u from %s!\n", my_short_id, ntohl(incoming->sender), ntohl(incoming->uid), GNUNET_i2s(&dn->identity));
1440 pos = dn->referee_head;
1441 while ((NULL != pos) && (pos->referrer_id != sid))
1443 sender_id = strdup(GNUNET_i2s(&pos->identity));
1444 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "I know sender %u %s\n", pos->referrer_id, sender_id);
1445 GNUNET_free(sender_id);
1451 for (i = 0; i< MAX_OUTSTANDING_MESSAGES; i++)
1453 if (dn->pending_messages[i].sender_id == 0)
1460 if (found_pos == -1)
1462 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1463 "%s: Too many unknown senders (%u), ignoring message! Message uid %llu from %s!\n", my_short_id, ntohl(incoming->sender), ntohl(incoming->uid), GNUNET_i2s(&dn->identity));
1467 dn->pending_messages[found_pos].message = GNUNET_malloc(ntohs (message->size));
1468 memcpy(dn->pending_messages[found_pos].message, message, ntohs(message->size));
1469 dn->pending_messages[found_pos].distance = distance;
1470 dn->pending_messages[found_pos].latency = latency;
1471 memcpy(&dn->pending_messages[found_pos].sender, peer, sizeof(struct GNUNET_PeerIdentity));
1472 dn->pending_messages[found_pos].sender_id = sid;
1474 /* unknown sender */
1477 original_sender = &pos->identity;
1478 tid = ntohl (incoming->recipient);
1482 cbuf = (char *)&incoming[1];
1484 tkm_ctx.peer = peer;
1485 tkm_ctx.distant = pos;
1486 tkm_ctx.uid = ntohl(incoming->uid);
1487 if (GNUNET_OK != GNUNET_SERVER_mst_receive (coreMST,
1490 packed_message_size,
1495 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: %s Received corrupt data, discarding!", my_short_id, "DV SERVICE");
1501 packed_message = (struct GNUNET_MessageHeader *)&incoming[1];
1504 /* FIXME: this is the *only* per-request operation we have in DV
1505 that is O(n) in relation to the number of connected peers; a
1506 hash-table lookup could easily solve this (minor performance
1510 GNUNET_CONTAINER_heap_iterate (neighbor_max_heap,
1511 &find_destination, &fdc);
1514 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1515 "%s: Receives %s message for someone else!\n", "dv", "DV DATA");
1518 if (fdc.dest == NULL)
1520 #if DEBUG_DV_MESSAGES
1521 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1522 "%s: Receives %s message uid %u for someone we don't know (id %u)!\n", my_short_id, "DV DATA", ntohl(incoming->uid), tid);
1526 destination = &fdc.dest->identity;
1528 if (0 == memcmp (destination, peer, sizeof (struct GNUNET_PeerIdentity)))
1530 /* FIXME: create stat: routing loop-discard! */
1532 #if DEBUG_DV_MESSAGES
1533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1534 "%s: DROPPING MESSAGE uid %u type %d, routing loop! Message immediately from %s!\n", my_short_id, ntohl(incoming->uid), ntohs(packed_message->type), GNUNET_i2s(&dn->identity));
1539 /* At this point we have a message, and we need to forward it on to the
1542 #if DEBUG_DV_MESSAGES
1543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1544 "%s: FORWARD %s message for %s, uid %u, size %d type %d, cost %u!\n", my_short_id, "DV DATA", GNUNET_i2s(destination), ntohl(incoming->uid), ntohs(packed_message->size), ntohs(packed_message->type), pos->cost);
1548 if (GNUNET_TIME_absolute_get_duration(pos->last_gossip).abs_value < GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 2).abs_value)
1550 delayed_context = GNUNET_malloc(sizeof(struct DelayedMessageContext));
1551 memcpy(&delayed_context->dest, destination, sizeof(struct GNUNET_PeerIdentity));
1552 memcpy(&delayed_context->sender, original_sender, sizeof(struct GNUNET_PeerIdentity));
1553 delayed_context->message = GNUNET_malloc(packed_message_size);
1554 memcpy(delayed_context->message, packed_message, packed_message_size);
1555 delayed_context->message_size = packed_message_size;
1556 delayed_context->uid = ntohl(incoming->uid);
1557 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 2500), &send_message_delayed, delayed_context);
1563 ret = send_message(destination,
1567 packed_message_size,
1568 default_dv_priority,
1569 ntohl(incoming->uid),
1570 GNUNET_TIME_relative_get_forever());
1572 if (ret != GNUNET_SYSERR)
1576 #if DEBUG_MESSAGE_DROP
1577 char *direct_id = GNUNET_strdup(GNUNET_i2s(&dn->identity));
1578 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1579 "%s: DROPPING MESSAGE type %d, forwarding failed! Message immediately from %s!\n", GNUNET_i2s(&my_identity), ntohs(((struct GNUNET_MessageHeader *)&incoming[1])->type), direct_id);
1580 GNUNET_free (direct_id);
1582 return GNUNET_SYSERR;
1588 * Iterator over hash map entries.
1590 * @param cls closure (NULL)
1591 * @param key current key code
1592 * @param value value in the hash map (DistantNeighbor)
1593 * @return GNUNET_YES if we should continue to
1597 int print_neighbors (void *cls,
1598 const GNUNET_HashCode * key,
1601 struct DistantNeighbor *distant_neighbor = abs_value;
1602 char my_shortname[5];
1603 char referrer_shortname[5];
1604 memcpy(&my_shortname, GNUNET_i2s(&my_identity), 4);
1605 my_shortname[4] = '\0';
1606 memcpy(&referrer_shortname, GNUNET_i2s(&distant_neighbor->referrer->identity), 4);
1607 referrer_shortname[4] = '\0';
1609 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "`%s' %s: Peer `%s', distance %d, referrer `%s' pkey: %s\n", &my_shortname, "DV", GNUNET_i2s(&distant_neighbor->identity), distant_neighbor->cost, &referrer_shortname, distant_neighbor->pkey == NULL ? "no" : "yes");
1615 * Scheduled task which gossips about known direct peers to other connected
1616 * peers. Will run until called with reason shutdown.
1619 neighbor_send_task (void *cls,
1620 const struct GNUNET_SCHEDULER_TaskContext *tc)
1622 struct NeighborSendContext *send_context = cls;
1623 #if DEBUG_DV_GOSSIP_SEND
1624 char * encPeerAbout;
1627 struct DistantNeighbor *about;
1628 struct DirectNeighbor *to;
1629 struct FastGossipNeighborList *about_list;
1631 p2p_dv_MESSAGE_NeighborInfo *message;
1632 struct PendingMessage *pending_message;
1634 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1638 "%s: Called with reason shutdown, shutting down!\n",
1639 GNUNET_i2s(&my_identity));
1644 if (send_context->fast_gossip_list_head != NULL)
1646 about_list = send_context->fast_gossip_list_head;
1647 about = about_list->about;
1648 GNUNET_CONTAINER_DLL_remove(send_context->fast_gossip_list_head,
1649 send_context->fast_gossip_list_tail,
1651 GNUNET_free(about_list);
1655 /* FIXME: this may become a problem, because the heap walk has only one internal "walker". This means
1656 * that if two neighbor_send_tasks are operating in lockstep (which is quite possible, given default
1657 * values for all connected peers) there may be a serious bias as to which peers get gossiped about!
1658 * Probably the *best* way to fix would be to have an opaque pointer to the walk position passed as
1659 * part of the walk_get_next call. Then the heap would have to keep a list of walks, or reset the walk
1660 * whenever a modification has been detected. Yuck either way. Perhaps we could iterate over the heap
1661 * once to get a list of peers to gossip about and gossip them over time... But then if one goes away
1662 * in the mean time that becomes nasty. For now we'll just assume that the walking is done
1663 * asynchronously enough to avoid major problems (-;
1665 * NOTE: probably fixed once we decided send rate based on allowed bandwidth.
1667 about = GNUNET_CONTAINER_heap_walk_get_next (neighbor_min_heap);
1669 to = send_context->toNeighbor;
1671 if ((about != NULL) && (to != about->referrer /* split horizon */ ) &&
1673 (about->hidden == GNUNET_NO) &&
1676 (0 != memcmp (&about->identity,
1677 &to->identity, sizeof (struct GNUNET_PeerIdentity))) &&
1678 (about->pkey != NULL))
1680 #if DEBUG_DV_GOSSIP_SEND
1681 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&about->identity));
1682 encPeerTo = GNUNET_strdup(GNUNET_i2s(&to->identity));
1683 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1684 "%s: Sending info about peer %s id %u to directly connected peer %s\n",
1685 GNUNET_i2s(&my_identity),
1686 encPeerAbout, about->our_id, encPeerTo);
1687 GNUNET_free(encPeerAbout);
1688 GNUNET_free(encPeerTo);
1690 about->last_gossip = GNUNET_TIME_absolute_get();
1691 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(p2p_dv_MESSAGE_NeighborInfo));
1692 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1693 pending_message->importance = default_dv_priority;
1694 pending_message->timeout = GNUNET_TIME_relative_get_forever();
1695 memcpy(&pending_message->recipient, &to->identity, sizeof(struct GNUNET_PeerIdentity));
1696 pending_message->msg_size = sizeof(p2p_dv_MESSAGE_NeighborInfo);
1697 message = (p2p_dv_MESSAGE_NeighborInfo *)pending_message->msg;
1698 message->header.size = htons (sizeof (p2p_dv_MESSAGE_NeighborInfo));
1699 message->header.type = htons (GNUNET_MESSAGE_TYPE_DV_GOSSIP);
1700 message->cost = htonl (about->cost);
1701 message->neighbor_id = htonl (about->our_id);
1703 memcpy (&message->pkey, about->pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1704 memcpy (&message->neighbor,
1705 &about->identity, sizeof (struct GNUNET_PeerIdentity));
1707 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1712 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1713 /*if (core_transmit_handle == NULL)
1714 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, GNUNET_YES, default_dv_priority, GNUNET_TIME_relative_get_forever(), &to->identity, sizeof(p2p_dv_MESSAGE_NeighborInfo), &core_transmit_notify, NULL);*/
1718 if (send_context->fast_gossip_list_head != NULL) /* If there are other peers in the fast list, schedule right away */
1720 #if DEBUG_DV_PEER_NUMBERS
1721 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "DV SERVICE: still in fast send mode\n");
1723 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
1727 #if DEBUG_DV_PEER_NUMBERS
1728 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "DV SERVICE: entering slow send mode\n");
1730 send_context->task = GNUNET_SCHEDULER_add_delayed(GNUNET_DV_DEFAULT_SEND_INTERVAL, &neighbor_send_task, send_context);
1738 * Handle START-message. This is the first message sent to us
1739 * by the client (can only be one!).
1741 * @param cls closure (always NULL)
1742 * @param client identification of the client
1743 * @param message the actual message
1746 handle_start (void *cls,
1747 struct GNUNET_SERVER_Client *client,
1748 const struct GNUNET_MessageHeader *message)
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1753 "Received `%s' request from client\n", "START");
1756 client_handle = client;
1758 GNUNET_SERVER_client_keep(client_handle);
1759 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1764 * Iterate over hash map entries for a distant neighbor,
1765 * if direct neighbor matches context call send message
1767 * @param cls closure, a DV_SendContext
1768 * @param key current key code
1769 * @param value value in the hash map
1770 * @return GNUNET_YES if we should continue to
1774 int send_iterator (void *cls,
1775 const GNUNET_HashCode * key,
1778 struct DV_SendContext *send_context = cls;
1779 struct DistantNeighbor *distant_neighbor = abs_value;
1781 if (memcmp(distant_neighbor->referrer, send_context->direct_peer, sizeof(struct GNUNET_PeerIdentity)) == 0) /* They match, send and free */
1783 send_message_via(&my_identity, distant_neighbor, send_context);
1791 * Service server's handler for message send requests (which come
1792 * bubbling up to us through the DV plugin).
1794 * @param cls closure
1795 * @param client identification of the client
1796 * @param message the actual message
1798 void handle_dv_send_message (void *cls,
1799 struct GNUNET_SERVER_Client * client,
1800 const struct GNUNET_MessageHeader * message)
1802 struct GNUNET_DV_SendMessage *send_msg;
1803 struct GNUNET_DV_SendResultMessage *send_result_msg;
1804 struct PendingMessage *pending_message;
1806 size_t message_size;
1807 struct GNUNET_PeerIdentity *destination;
1808 struct GNUNET_PeerIdentity *direct;
1809 struct GNUNET_MessageHeader *message_buf;
1812 static struct GNUNET_CRYPTO_HashAsciiEncoded dest_hash;
1813 struct DV_SendContext *send_context;
1814 #if DEBUG_DV_MESSAGES
1816 struct GNUNET_MessageHeader *packed_message;
1819 if (client_handle == NULL)
1821 client_handle = client;
1822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1823 "%s: Setting initial client handle, never received `%s' message?\n", "dv", "START");
1825 else if (client_handle != client)
1827 client_handle = client;
1828 /* What should we do in this case, assert fail or just log the warning? */
1830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1831 "%s: Setting client handle (was a different client!)!\n", "dv");
1835 GNUNET_assert(ntohs(message->size) > sizeof(struct GNUNET_DV_SendMessage));
1836 send_msg = (struct GNUNET_DV_SendMessage *)message;
1838 address_len = ntohl(send_msg->addrlen);
1839 GNUNET_assert(address_len == sizeof(struct GNUNET_PeerIdentity) * 2);
1840 message_size = ntohs(message->size) - sizeof(struct GNUNET_DV_SendMessage) - address_len;
1841 destination = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
1842 direct = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
1843 message_buf = GNUNET_malloc(message_size);
1845 temp_pos = (char *)&send_msg[1]; /* Set pointer to end of message */
1846 offset = 0; /* Offset starts at zero */
1848 memcpy(destination, &temp_pos[offset], sizeof(struct GNUNET_PeerIdentity));
1849 offset += sizeof(struct GNUNET_PeerIdentity);
1851 memcpy(direct, &temp_pos[offset], sizeof(struct GNUNET_PeerIdentity));
1852 offset += sizeof(struct GNUNET_PeerIdentity);
1855 memcpy(message_buf, &temp_pos[offset], message_size);
1856 if (memcmp(&send_msg->target, destination, sizeof(struct GNUNET_PeerIdentity)) != 0)
1858 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1859 dest_hash.encoding[4] = '\0';
1860 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: asked to send message to `%s', but address is for `%s'!", "DV SERVICE", GNUNET_i2s(&send_msg->target), (const char *)&dest_hash.encoding);
1863 #if DEBUG_DV_MESSAGES
1864 cbuf = (char *)message_buf;
1866 while(offset < message_size)
1868 packed_message = (struct GNUNET_MessageHeader *)&cbuf[offset];
1869 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: DV PLUGIN SEND uid %u type %d to %s\n", my_short_id, ntohl(send_msg->uid), ntohs(packed_message->type), GNUNET_i2s(destination));
1870 offset += ntohs(packed_message->size);
1872 /*GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: DV PLUGIN SEND uid %u type %d to %s\n", my_short_id, ntohl(send_msg->uid), ntohs(message_buf->type), GNUNET_i2s(destination));*/
1874 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1875 dest_hash.encoding[4] = '\0';
1876 send_context = GNUNET_malloc(sizeof(struct DV_SendContext));
1878 send_result_msg = GNUNET_malloc(sizeof(struct GNUNET_DV_SendResultMessage));
1879 send_result_msg->header.size = htons(sizeof(struct GNUNET_DV_SendResultMessage));
1880 send_result_msg->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_DV_SEND_RESULT);
1881 send_result_msg->uid = send_msg->uid; /* No need to ntohl->htonl this */
1883 send_context->importance = ntohl(send_msg->priority);
1884 send_context->timeout = send_msg->timeout;
1885 send_context->direct_peer = direct;
1886 send_context->distant_peer = destination;
1887 send_context->message = message_buf;
1888 send_context->message_size = message_size;
1889 send_context->send_result = send_result_msg;
1890 #if DEBUG_DV_MESSAGES
1891 send_context->uid = send_msg->uid;
1894 if (send_message_via(&my_identity, direct, send_context) != GNUNET_YES)
1896 send_result_msg->result = htons(1);
1897 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
1898 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1899 memcpy(&pending_message[1], send_result_msg, sizeof(struct GNUNET_DV_SendResultMessage));
1900 GNUNET_free(send_result_msg);
1902 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, pending_message);
1904 if (client_handle != NULL)
1906 if (plugin_transmit_handle == NULL)
1908 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
1909 sizeof(struct GNUNET_DV_SendResultMessage),
1910 GNUNET_TIME_UNIT_FOREVER_REL,
1911 &transmit_to_plugin, NULL);
1915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
1918 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1919 dest_hash.encoding[4] = '\0';
1920 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s DV SEND failed to send message to destination `%s' via `%s'\n", my_short_id, (const char *)&dest_hash.encoding, GNUNET_i2s(direct));
1923 /* In bizarro world GNUNET_SYSERR indicates that we succeeded */
1925 if (GNUNET_SYSERR != GNUNET_CONTAINER_multihashmap_get_multiple(extended_neighbors, &destination->hashPubKey, &send_iterator, send_context))
1927 send_result_msg->result = htons(1);
1928 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
1929 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1930 memcpy(&pending_message[1], send_result_msg, sizeof(struct GNUNET_DV_SendResultMessage));
1931 GNUNET_free(send_result_msg);
1933 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, pending_message);
1935 if (client_handle != NULL)
1937 if (plugin_transmit_handle == NULL)
1939 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
1940 sizeof(struct GNUNET_DV_SendResultMessage),
1941 GNUNET_TIME_UNIT_FOREVER_REL,
1942 &transmit_to_plugin, NULL);
1946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
1949 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1950 dest_hash.encoding[4] = '\0';
1951 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s DV SEND failed to send message to destination `%s' via `%s'\n", my_short_id, (const char *)&dest_hash.encoding, GNUNET_i2s(direct));
1954 GNUNET_free(message_buf);
1955 GNUNET_free(send_context);
1956 GNUNET_free(direct);
1957 GNUNET_free(destination);
1959 GNUNET_SERVER_receive_done(client, GNUNET_OK);
1962 /** Forward declarations **/
1963 static int handle_dv_gossip_message (void *cls,
1964 const struct GNUNET_PeerIdentity *peer,
1965 const struct GNUNET_MessageHeader *message,
1966 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
1968 static int handle_dv_disconnect_message (void *cls,
1969 const struct GNUNET_PeerIdentity *peer,
1970 const struct GNUNET_MessageHeader *message,
1971 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
1972 /** End forward declarations **/
1976 * List of handlers for the messages understood by this
1979 * Hmm... will we need to register some handlers with core and
1980 * some handlers with our server here? Because core should be
1981 * getting the incoming DV messages (from whichever lower level
1982 * transport) and then our server should be getting messages
1983 * from the dv_plugin, right?
1985 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
1986 {&handle_dv_data_message, GNUNET_MESSAGE_TYPE_DV_DATA, 0},
1987 {&handle_dv_gossip_message, GNUNET_MESSAGE_TYPE_DV_GOSSIP, 0},
1988 {&handle_dv_disconnect_message, GNUNET_MESSAGE_TYPE_DV_DISCONNECT, 0},
1992 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1993 {&handle_dv_send_message, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_DV_SEND, 0},
1994 {&handle_start, NULL, GNUNET_MESSAGE_TYPE_DV_START, 0},
1999 * Free a DistantNeighbor node, including removing it
2000 * from the referer's list.
2003 distant_neighbor_free (struct DistantNeighbor *referee)
2005 struct DirectNeighbor *referrer;
2007 referrer = referee->referrer;
2008 if (referrer != NULL)
2010 GNUNET_CONTAINER_DLL_remove (referrer->referee_head,
2011 referrer->referee_tail, referee);
2013 GNUNET_CONTAINER_heap_remove_node (referee->max_loc);
2014 GNUNET_CONTAINER_heap_remove_node (referee->min_loc);
2015 GNUNET_CONTAINER_multihashmap_remove_all (extended_neighbors,
2016 &referee->identity.hashPubKey);
2017 GNUNET_free_non_null (referee->pkey);
2018 GNUNET_free (referee);
2022 * Free a DirectNeighbor node, including removing it
2023 * from the referer's list.
2026 direct_neighbor_free (struct DirectNeighbor *direct)
2028 struct NeighborSendContext *send_context;
2029 struct FastGossipNeighborList *about_list;
2030 struct FastGossipNeighborList *prev_about;
2032 send_context = direct->send_context;
2034 if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2035 GNUNET_SCHEDULER_cancel(send_context->task);
2037 about_list = send_context->fast_gossip_list_head;
2038 while (about_list != NULL)
2040 GNUNET_CONTAINER_DLL_remove(send_context->fast_gossip_list_head, send_context->fast_gossip_list_tail, about_list);
2041 prev_about = about_list;
2042 about_list = about_list->next;
2043 GNUNET_free(prev_about);
2045 GNUNET_free(send_context);
2046 GNUNET_free(direct);
2050 * Multihashmap iterator for sending out disconnect messages
2053 * @param cls the peer that was disconnected
2054 * @param key key value stored under
2055 * @param value the direct neighbor to send disconnect to
2057 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2059 static int schedule_disconnect_messages (void *cls,
2060 const GNUNET_HashCode * key,
2063 struct DisconnectContext *disconnect_context = cls;
2064 struct DirectNeighbor *disconnected = disconnect_context->direct;
2065 struct DirectNeighbor *notify = value;
2066 struct PendingMessage *pending_message;
2067 p2p_dv_MESSAGE_Disconnect *disconnect_message;
2069 if (memcmp(¬ify->identity, &disconnected->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2070 return GNUNET_YES; /* Don't send disconnect message to peer that disconnected! */
2072 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(p2p_dv_MESSAGE_Disconnect));
2073 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
2074 pending_message->importance = default_dv_priority;
2075 pending_message->timeout = GNUNET_TIME_relative_get_forever();
2076 memcpy(&pending_message->recipient, ¬ify->identity, sizeof(struct GNUNET_PeerIdentity));
2077 pending_message->msg_size = sizeof(p2p_dv_MESSAGE_Disconnect);
2078 disconnect_message = (p2p_dv_MESSAGE_Disconnect *)pending_message->msg;
2079 disconnect_message->header.size = htons (sizeof (p2p_dv_MESSAGE_Disconnect));
2080 disconnect_message->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
2081 disconnect_message->peer_id = htonl(disconnect_context->distant->our_id);
2083 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
2088 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
2089 /*if (core_transmit_handle == NULL)
2090 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, GNUNET_YES, default_dv_priority, GNUNET_TIME_relative_get_forever(), ¬ify->identity, sizeof(p2p_dv_MESSAGE_Disconnect), &core_transmit_notify, NULL);*/
2096 * Multihashmap iterator for freeing extended neighbors.
2099 * @param key key value stored under
2100 * @param value the distant neighbor to be freed
2102 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2104 static int free_extended_neighbors (void *cls,
2105 const GNUNET_HashCode * key,
2108 struct DistantNeighbor *distant = value;
2109 distant_neighbor_free(distant);
2114 * Multihashmap iterator for freeing direct neighbors.
2117 * @param key key value stored under
2118 * @param value the direct neighbor to be freed
2120 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2122 static int free_direct_neighbors (void *cls,
2123 const GNUNET_HashCode * key,
2126 struct DirectNeighbor *direct = value;
2127 direct_neighbor_free(direct);
2133 * Task run during shutdown.
2139 shutdown_task (void *cls,
2140 const struct GNUNET_SCHEDULER_TaskContext *tc)
2143 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "calling CORE_DISCONNECT\n");
2144 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &print_neighbors, NULL);
2146 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &free_extended_neighbors, NULL);
2147 GNUNET_CONTAINER_multihashmap_destroy(extended_neighbors);
2148 GNUNET_CONTAINER_multihashmap_iterate(direct_neighbors, &free_direct_neighbors, NULL);
2149 GNUNET_CONTAINER_multihashmap_destroy(direct_neighbors);
2151 GNUNET_CONTAINER_heap_destroy(neighbor_max_heap);
2152 GNUNET_CONTAINER_heap_destroy(neighbor_min_heap);
2154 GNUNET_CORE_disconnect (coreAPI);
2156 GNUNET_PEERINFO_disconnect(peerinfo_handle);
2157 GNUNET_SERVER_mst_destroy(coreMST);
2158 GNUNET_free_non_null(my_short_id);
2160 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "CORE_DISCONNECT completed\n");
2165 * To be called on core init/fail.
2167 void core_init (void *cls,
2168 struct GNUNET_CORE_Handle * server,
2169 const struct GNUNET_PeerIdentity *identity,
2170 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded * publicKey)
2175 GNUNET_SCHEDULER_cancel(cleanup_task);
2176 GNUNET_SCHEDULER_add_now(&shutdown_task, NULL);
2180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2181 "%s: Core connection initialized, I am peer: %s\n", "dv", GNUNET_i2s(identity));
2183 memcpy(&my_identity, identity, sizeof(struct GNUNET_PeerIdentity));
2184 my_short_id = GNUNET_strdup(GNUNET_i2s(&my_identity));
2189 #if PKEY_NO_NEIGHBOR_ON_ADD
2191 * Iterator over hash map entries.
2193 * @param cls closure
2194 * @param key current key code
2195 * @param value value in the hash map
2196 * @return GNUNET_YES if we should continue to
2200 static int add_pkey_to_extended (void *cls,
2201 const GNUNET_HashCode * key,
2204 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey = cls;
2205 struct DistantNeighbor *distant_neighbor = abs_value;
2207 if (distant_neighbor->pkey == NULL)
2209 distant_neighbor->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2210 memcpy(distant_neighbor->pkey, pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2218 * Iterator over hash map entries.
2220 * @param cls closure
2221 * @param key current key code
2222 * @param value value in the hash map
2223 * @return GNUNET_YES if we should continue to
2227 static int update_matching_neighbors (void *cls,
2228 const GNUNET_HashCode * key,
2231 struct NeighborUpdateInfo * update_info = cls;
2232 struct DistantNeighbor *distant_neighbor = value;
2234 if (update_info->referrer == distant_neighbor->referrer) /* Direct neighbor matches, update it's info and return GNUNET_NO */
2236 /* same referrer, cost change! */
2237 GNUNET_CONTAINER_heap_update_cost (neighbor_max_heap,
2238 update_info->neighbor->max_loc, update_info->cost);
2239 GNUNET_CONTAINER_heap_update_cost (neighbor_min_heap,
2240 update_info->neighbor->min_loc, update_info->cost);
2241 update_info->neighbor->last_activity = update_info->now;
2242 update_info->neighbor->cost = update_info->cost;
2243 update_info->neighbor->referrer_id = update_info->referrer_peer_id;
2252 * Iterate over all current direct peers, add DISTANT newly connected
2253 * peer to the fast gossip list for that peer so we get DV routing
2254 * information out as fast as possible!
2256 * @param cls the newly connected neighbor we will gossip about
2257 * @param key the hashcode of the peer
2258 * @param value the direct neighbor we should gossip to
2260 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2262 static int add_distant_all_direct_neighbors (void *cls,
2263 const GNUNET_HashCode * key,
2266 struct DirectNeighbor *direct = (struct DirectNeighbor *)value;
2267 struct DistantNeighbor *distant = (struct DistantNeighbor *)cls;
2268 struct NeighborSendContext *send_context = direct->send_context;
2269 struct FastGossipNeighborList *gossip_entry;
2275 if (distant == NULL)
2280 if (memcmp(&direct->identity, &distant->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2282 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2286 if (distant->hidden == GNUNET_YES)
2287 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2289 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2290 gossip_entry->about = distant;
2292 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2293 send_context->fast_gossip_list_tail,
2294 send_context->fast_gossip_list_tail,
2297 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&distant->identity));
2298 encPeerTo = GNUNET_strdup(GNUNET_i2s(&direct->identity));
2300 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Fast send info about peer %s id %u for directly connected peer %s\n",
2301 GNUNET_i2s(&my_identity),
2302 encPeerAbout, distant->our_id, encPeerTo);
2303 GNUNET_free(encPeerAbout);
2304 GNUNET_free(encPeerTo);
2306 /*if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2307 GNUNET_SCHEDULER_cancel(send_context->task);*/
2309 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
2314 * Callback for hello address creation.
2316 * @param cls closure, a struct HelloContext
2317 * @param max maximum number of bytes that can be written to buf
2318 * @param buf where to write the address information
2320 * @return number of bytes written, 0 to signal the
2321 * end of the iteration.
2324 generate_hello_address (void *cls, size_t max, void *buf)
2326 struct HelloContext *hello_context = cls;
2332 if (hello_context->addresses_to_add == 0)
2335 /* Hello "address" will be concatenation of distant peer and direct peer identities */
2336 size = 2 * sizeof(struct GNUNET_PeerIdentity);
2337 GNUNET_assert(max >= size);
2339 addr_buffer = GNUNET_malloc(size);
2341 /* Copy the distant peer identity to buffer */
2342 memcpy(addr_buffer, &hello_context->distant_peer, sizeof(struct GNUNET_PeerIdentity));
2343 offset += sizeof(struct GNUNET_PeerIdentity);
2344 /* Copy the direct peer identity to buffer */
2345 memcpy(&addr_buffer[offset], hello_context->direct_peer, sizeof(struct GNUNET_PeerIdentity));
2346 ret = GNUNET_HELLO_add_address ("dv",
2347 GNUNET_TIME_relative_to_absolute
2348 (GNUNET_TIME_UNIT_HOURS), addr_buffer, size,
2351 hello_context->addresses_to_add--;
2353 GNUNET_free(addr_buffer);
2359 * Handles when a peer is either added due to being newly connected
2360 * or having been gossiped about, also called when the cost for a neighbor
2361 * needs to be updated.
2363 * @param peer identity of the peer whose info is being added/updated
2364 * @param pkey public key of the peer whose info is being added/updated
2365 * @param referrer_peer_id id to use when sending to 'peer'
2366 * @param referrer if this is a gossiped peer, who did we hear it from?
2367 * @param cost the cost of communicating with this peer via 'referrer'
2369 * @return the added neighbor, the updated neighbor or NULL (neighbor
2372 static struct DistantNeighbor *
2373 addUpdateNeighbor (const struct GNUNET_PeerIdentity * peer,
2374 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey,
2375 unsigned int referrer_peer_id,
2376 struct DirectNeighbor *referrer, unsigned int cost)
2378 struct DistantNeighbor *neighbor;
2379 struct DistantNeighbor *max;
2380 struct GNUNET_TIME_Absolute now;
2381 struct NeighborUpdateInfo *neighbor_update;
2382 struct HelloContext *hello_context;
2383 struct GNUNET_HELLO_Message *hello_msg;
2384 unsigned int our_id;
2389 #if DEBUG_DV_PEER_NUMBERS
2391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2392 "%s Received sender id (%u)!\n", "DV SERVICE", referrer_peer_id);
2395 now = GNUNET_TIME_absolute_get ();
2396 neighbor = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
2398 neighbor_update = GNUNET_malloc(sizeof(struct NeighborUpdateInfo));
2399 neighbor_update->neighbor = neighbor;
2400 neighbor_update->cost = cost;
2401 neighbor_update->now = now;
2402 neighbor_update->referrer = referrer;
2403 neighbor_update->referrer_peer_id = referrer_peer_id;
2405 if (neighbor != NULL)
2408 memcpy(&our_id, &neighbor->identity, sizeof(unsigned int));
2410 our_id = neighbor->our_id;
2416 memcpy(&our_id, peer, sizeof(unsigned int));
2418 our_id = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, RAND_MAX - 1) + 1;
2422 /* Either we do not know this peer, or we already do but via a different immediate peer */
2423 if ((neighbor == NULL) ||
2424 (GNUNET_CONTAINER_multihashmap_get_multiple(extended_neighbors,
2426 &update_matching_neighbors,
2427 neighbor_update) != GNUNET_SYSERR))
2430 if ((neighbor != NULL) && (cost < neighbor->cost)) /* New cost is less than old, remove old */
2432 distant_neighbor_free(neighbor);
2434 else if (neighbor != NULL) /* Only allow one DV connection to each peer */
2440 if (cost > fisheye_depth)
2443 GNUNET_free(neighbor_update);
2447 #if DEBUG_DV_PEER_NUMBERS
2448 encAbout = GNUNET_strdup(GNUNET_i2s(peer));
2449 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2450 "%s: %s Chose NEW id (%u) for peer %s!\n", GNUNET_i2s(&my_identity), "DV SERVICE", our_id, encAbout);
2451 GNUNET_free(encAbout);
2454 if (max_table_size <=
2455 GNUNET_CONTAINER_multihashmap_size (extended_neighbors))
2457 /* remove most expensive entry */
2458 max = GNUNET_CONTAINER_heap_peek (neighbor_max_heap);
2459 GNUNET_assert(max != NULL);
2460 if (cost > max->cost)
2462 /* new entry most expensive, don't create */
2463 GNUNET_free(neighbor_update);
2468 /* only free if this is not a direct connection;
2469 we could theoretically have more direct
2470 connections than DV entries allowed total! */
2471 distant_neighbor_free (max);
2475 neighbor = GNUNET_malloc (sizeof (struct DistantNeighbor));
2476 GNUNET_CONTAINER_DLL_insert (referrer->referee_head,
2477 referrer->referee_tail, neighbor);
2478 neighbor->max_loc = GNUNET_CONTAINER_heap_insert (neighbor_max_heap,
2480 neighbor->min_loc = GNUNET_CONTAINER_heap_insert (neighbor_min_heap,
2482 neighbor->referrer = referrer;
2483 memcpy (&neighbor->identity, peer, sizeof (struct GNUNET_PeerIdentity));
2484 if (pkey != NULL) /* pkey will be null on direct neighbor addition */
2486 neighbor->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2487 memcpy (neighbor->pkey, pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2490 neighbor->pkey = pkey;
2492 neighbor->last_activity = now;
2493 neighbor->cost = cost;
2494 neighbor->referrer_id = referrer_peer_id;
2495 neighbor->our_id = our_id;
2497 (cost == DIRECT_NEIGHBOR_COST) ? (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4) ==
2500 GNUNET_CONTAINER_multihashmap_put (extended_neighbors, &peer->hashPubKey,
2502 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2503 if (referrer_peer_id != 0)
2505 for (i = 0; i< MAX_OUTSTANDING_MESSAGES; i++)
2507 if (referrer->pending_messages[i].sender_id == referrer_peer_id) /* We have a queued message from just learned about peer! */
2509 #if DEBUG_DV_MESSAGES
2510 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: learned about peer %llu from which we have a previous unknown message, processing!\n", my_short_id, referrer_peer_id);
2512 struct GNUNET_TRANSPORT_ATS_Information atsi[3];
2513 atsi[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2514 atsi[0].value = htonl (referrer->pending_messages[i].distance);
2515 atsi[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
2516 atsi[1].value = htonl ((uint32_t)referrer->pending_messages[i].latency.rel_value);
2517 atsi[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2518 atsi[2].value = htonl (0);
2519 handle_dv_data_message(NULL,
2520 &referrer->pending_messages[i].sender,
2521 referrer->pending_messages[i].message,
2522 (const struct GNUNET_TRANSPORT_ATS_Information *)&atsi);
2523 GNUNET_free(referrer->pending_messages[i].message);
2524 referrer->pending_messages[i].sender_id = 0;
2528 if ((cost != DIRECT_NEIGHBOR_COST) && (neighbor->pkey != NULL))
2530 /* Added neighbor, now send HELLO to transport */
2531 hello_context = GNUNET_malloc(sizeof(struct HelloContext));
2532 hello_context->direct_peer = &referrer->identity;
2533 memcpy(&hello_context->distant_peer, peer, sizeof(struct GNUNET_PeerIdentity));
2534 hello_context->addresses_to_add = 1;
2535 hello_msg = GNUNET_HELLO_create(pkey, &generate_hello_address, hello_context);
2536 GNUNET_assert(memcmp(hello_context->direct_peer, &hello_context->distant_peer, sizeof(struct GNUNET_PeerIdentity)) != 0);
2537 addr1 = GNUNET_strdup(GNUNET_i2s(hello_context->direct_peer));
2538 addr2 = GNUNET_strdup(GNUNET_i2s(&hello_context->distant_peer));
2540 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: GIVING HELLO size %d for %s via %s to TRANSPORT\n", my_short_id, GNUNET_HELLO_size(hello_msg), addr2, addr1);
2544 send_to_plugin(hello_context->direct_peer, GNUNET_HELLO_get_header(hello_msg), GNUNET_HELLO_size(hello_msg), &hello_context->distant_peer, cost);
2545 GNUNET_free(hello_context);
2546 GNUNET_free(hello_msg);
2553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2554 "%s: Already know peer %s distance %d, referrer id %d!\n", "dv", GNUNET_i2s(peer), cost, referrer_peer_id);
2558 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2559 "%s: Size of extended_neighbors is %d\n", "dv", GNUNET_CONTAINER_multihashmap_size(extended_neighbors));
2562 GNUNET_free(neighbor_update);
2568 * Core handler for dv disconnect messages. These will be used
2569 * by us to tell transport via the dv plugin that a peer can
2570 * no longer be contacted by us via a certain address. We should
2571 * then propagate these messages on, given that the distance to
2572 * the peer indicates we would have gossiped about it to others.
2574 * @param cls closure
2575 * @param peer peer which sent the message (immediate sender)
2576 * @param message the message
2577 * @param atsi performance data
2579 static int handle_dv_disconnect_message (void *cls,
2580 const struct GNUNET_PeerIdentity *peer,
2581 const struct GNUNET_MessageHeader *message,
2582 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2584 struct DirectNeighbor *referrer;
2585 struct DistantNeighbor *distant;
2586 p2p_dv_MESSAGE_Disconnect *enc_message = (p2p_dv_MESSAGE_Disconnect *)message;
2588 if (ntohs (message->size) < sizeof (p2p_dv_MESSAGE_Disconnect))
2590 return GNUNET_SYSERR; /* invalid message */
2593 referrer = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
2595 if (referrer == NULL)
2598 distant = referrer->referee_head;
2599 while (distant != NULL)
2601 if (distant->referrer_id == ntohl(enc_message->peer_id))
2603 distant_neighbor_free(distant);
2604 distant = referrer->referee_head;
2607 distant = distant->next;
2615 * Core handler for dv gossip messages. These will be used
2616 * by us to create a HELLO message for the newly peer containing
2617 * which direct peer we can connect through, and what the cost
2618 * is. This HELLO will then be scheduled for validation by the
2619 * transport service so that it can be used by all others.
2621 * @param cls closure
2622 * @param peer peer which sent the message (immediate sender)
2623 * @param message the message
2624 * @param atsi performance data
2627 handle_dv_gossip_message (void *cls,
2628 const struct GNUNET_PeerIdentity *peer,
2629 const struct GNUNET_MessageHeader *message,
2630 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2632 struct DirectNeighbor *referrer;
2633 p2p_dv_MESSAGE_NeighborInfo *enc_message = (p2p_dv_MESSAGE_NeighborInfo *)message;
2635 if (ntohs (message->size) < sizeof (p2p_dv_MESSAGE_NeighborInfo))
2637 return GNUNET_SYSERR; /* invalid message */
2640 #if DEBUG_DV_GOSSIP_RECEIPT
2641 char * encPeerAbout;
2644 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&enc_message->neighbor));
2645 encPeerFrom = GNUNET_strdup(GNUNET_i2s(peer));
2646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2647 "%s: Received %s message from peer %s about peer %s id %u distance %d!\n", GNUNET_i2s(&my_identity), "DV GOSSIP", encPeerFrom, encPeerAbout, ntohl(enc_message->neighbor_id), ntohl (enc_message->cost) + 1);
2648 GNUNET_free(encPeerAbout);
2649 GNUNET_free(encPeerFrom);
2652 referrer = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
2654 if (referrer == NULL)
2657 addUpdateNeighbor (&enc_message->neighbor, &enc_message->pkey,
2658 ntohl (enc_message->neighbor_id),
2659 referrer, ntohl (enc_message->cost) + 1);
2666 * Iterate over all currently known peers, add them to the
2667 * fast gossip list for this peer so we get DV routing information
2668 * out as fast as possible!
2670 * @param cls the direct neighbor we will gossip to
2671 * @param key the hashcode of the peer
2672 * @param value the distant neighbor we should add to the list
2674 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2677 add_all_extended_peers (void *cls,
2678 const GNUNET_HashCode * key,
2681 struct NeighborSendContext *send_context = (struct NeighborSendContext *)cls;
2682 struct DistantNeighbor *distant = (struct DistantNeighbor *)value;
2683 struct FastGossipNeighborList *gossip_entry;
2685 if (memcmp(&send_context->toNeighbor->identity, &distant->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2686 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2689 if (distant->hidden == GNUNET_YES)
2690 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2692 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2693 gossip_entry->about = distant;
2695 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2696 send_context->fast_gossip_list_tail,
2697 send_context->fast_gossip_list_tail,
2705 * Iterator over hash map entries.
2707 * @param cls closure
2708 * @param key current key code
2709 * @param value value in the hash map
2710 * @return GNUNET_YES if we should continue to
2715 gossip_all_to_all_iterator (void *cls,
2716 const GNUNET_HashCode * key,
2719 struct DirectNeighbor *direct = abs_value;
2721 GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &add_all_extended_peers, direct->send_context);
2723 if (direct->send_context->task != GNUNET_SCHEDULER_NO_TASK)
2724 GNUNET_SCHEDULER_cancel(direct->send_context->task);
2726 direct->send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, direct->send_context);
2731 * Task run during shutdown.
2737 gossip_all_to_all (void *cls,
2738 const struct GNUNET_SCHEDULER_TaskContext *tc)
2740 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &gossip_all_to_all_iterator, NULL);
2742 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5),
2749 * Iterate over all current direct peers, add newly connected peer
2750 * to the fast gossip list for that peer so we get DV routing
2751 * information out as fast as possible!
2753 * @param cls the newly connected neighbor we will gossip about
2754 * @param key the hashcode of the peer
2755 * @param value the direct neighbor we should gossip to
2757 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2760 add_all_direct_neighbors (void *cls,
2761 const GNUNET_HashCode * key,
2764 struct DirectNeighbor *direct = (struct DirectNeighbor *)value;
2765 struct DirectNeighbor *to = (struct DirectNeighbor *)cls;
2766 struct DistantNeighbor *distant;
2767 struct NeighborSendContext *send_context = direct->send_context;
2768 struct FastGossipNeighborList *gossip_entry;
2772 distant = GNUNET_CONTAINER_multihashmap_get(extended_neighbors, &to->identity.hashPubKey);
2773 if (distant == NULL)
2778 if (memcmp(&direct->identity, &to->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2780 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2784 if (distant->hidden == GNUNET_YES)
2785 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2787 direct_id = GNUNET_strdup(GNUNET_i2s(&direct->identity));
2789 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: adding peer %s to fast send list for %s\n", my_short_id, GNUNET_i2s(&distant->identity), direct_id);
2791 GNUNET_free(direct_id);
2792 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2793 gossip_entry->about = distant;
2795 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2796 send_context->fast_gossip_list_tail,
2797 send_context->fast_gossip_list_tail,
2799 if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2800 GNUNET_SCHEDULER_cancel(send_context->task);
2802 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
2803 //tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
2804 //neighbor_send_task(send_context, &tc);
2809 * Type of an iterator over the hosts. Note that each
2810 * host will be called with each available protocol.
2812 * @param cls closure
2813 * @param peer id of the peer, NULL for last call
2814 * @param hello hello message for the peer (can be NULL)
2815 * @param err_msg NULL if successful, otherwise contains error message
2818 process_peerinfo (void *cls,
2819 const struct GNUNET_PeerIdentity *peer,
2820 const struct GNUNET_HELLO_Message *hello,
2821 const char *err_msg)
2823 struct PeerIteratorContext *peerinfo_iterator = cls;
2824 struct DirectNeighbor *neighbor = peerinfo_iterator->neighbor;
2825 struct DistantNeighbor *distant = peerinfo_iterator->distant;
2826 #if DEBUG_DV_PEER_NUMBERS
2830 if (err_msg != NULL)
2832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2833 _("Error in communication with PEERINFO service\n"));
2838 if (distant->pkey == NULL)
2841 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Failed to get peerinfo information for this peer, retrying!\n");
2843 peerinfo_iterator->ic = GNUNET_PEERINFO_iterate(peerinfo_handle,
2844 &peerinfo_iterator->neighbor->identity,
2845 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3),
2851 GNUNET_free(peerinfo_iterator);
2856 if (memcmp(&neighbor->identity, peer, sizeof(struct GNUNET_PeerIdentity) != 0))
2859 if ((hello != NULL) && (GNUNET_HELLO_get_key (hello, &neighbor->pkey) == GNUNET_OK))
2861 if (distant->pkey == NULL)
2863 distant->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2864 memcpy(distant->pkey, &neighbor->pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2867 sent = GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &add_all_extended_peers, neighbor->send_context);
2870 GNUNET_STATISTICS_update (stats, "# distant peers gossiped to direct neighbors", sent, GNUNET_NO);
2872 #if DEBUG_DV_PEER_NUMBERS
2873 neighbor_pid = GNUNET_strdup(GNUNET_i2s(&neighbor->identity));
2874 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Gossipped %d extended peers to %s\n", GNUNET_i2s(&my_identity), sent, neighbor_pid);
2876 sent = GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &add_all_direct_neighbors, neighbor);
2879 GNUNET_STATISTICS_update (stats, "# direct peers gossiped to direct neighbors", sent, GNUNET_NO);
2881 #if DEBUG_DV_PEER_NUMBERS
2882 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Gossipped about %s to %d direct peers\n", GNUNET_i2s(&my_identity), neighbor_pid, sent);
2883 GNUNET_free(neighbor_pid);
2885 neighbor->send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, neighbor->send_context);
2891 * Method called whenever a peer connects.
2893 * @param cls closure
2894 * @param peer peer identity this notification is about
2895 * @param atsi performance data
2898 handle_core_connect (void *cls,
2899 const struct GNUNET_PeerIdentity * peer,
2900 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2902 struct DirectNeighbor *neighbor;
2903 struct DistantNeighbor *about;
2904 struct PeerIteratorContext *peerinfo_iterator;
2907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2908 "%s: Receives core connect message for peer %s distance %d!\n", "dv", GNUNET_i2s(peer), distance);
2912 /* Check for connect to self message */
2913 if (0 == memcmp(&my_identity, peer, sizeof(struct GNUNET_PeerIdentity)))
2916 distance = get_atsi_distance (atsi);
2917 if ((distance == DIRECT_NEIGHBOR_COST) &&
2918 (GNUNET_CONTAINER_multihashmap_get(direct_neighbors, &peer->hashPubKey) == NULL))
2920 peerinfo_iterator = GNUNET_malloc(sizeof(struct PeerIteratorContext));
2921 neighbor = GNUNET_malloc (sizeof (struct DirectNeighbor));
2922 neighbor->send_context = GNUNET_malloc(sizeof(struct NeighborSendContext));
2923 neighbor->send_context->toNeighbor = neighbor;
2924 memcpy (&neighbor->identity, peer, sizeof (struct GNUNET_PeerIdentity));
2926 GNUNET_assert(GNUNET_SYSERR != GNUNET_CONTAINER_multihashmap_put (direct_neighbors,
2928 neighbor, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2929 about = addUpdateNeighbor (peer, NULL, 0, neighbor, DIRECT_NEIGHBOR_COST);
2930 peerinfo_iterator->distant = about;
2931 peerinfo_iterator->neighbor = neighbor;
2932 peerinfo_iterator->ic = GNUNET_PEERINFO_iterate (peerinfo_handle,
2934 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3),
2938 if ((about != NULL) && (about->pkey == NULL))
2941 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Newly added peer %s has NULL pkey!\n", GNUNET_i2s(peer));
2944 else if (about != NULL)
2946 GNUNET_free(peerinfo_iterator);
2951 about = GNUNET_CONTAINER_multihashmap_get(extended_neighbors, &peer->hashPubKey);
2952 if ((GNUNET_CONTAINER_multihashmap_get(direct_neighbors, &peer->hashPubKey) == NULL) && (about != NULL))
2954 sent = GNUNET_CONTAINER_multihashmap_iterate(direct_neighbors, &add_distant_all_direct_neighbors, about);
2956 GNUNET_STATISTICS_update (stats, "# direct peers gossiped to new direct neighbors", sent, GNUNET_NO);
2959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2960 "%s: Distance (%d) greater than %d or already know about peer (%s), not re-adding!\n", "dv", distance, DIRECT_NEIGHBOR_COST, GNUNET_i2s(peer));
2967 * Method called whenever a given peer disconnects.
2969 * @param cls closure
2970 * @param peer peer identity this notification is about
2972 void handle_core_disconnect (void *cls,
2973 const struct GNUNET_PeerIdentity * peer)
2975 struct DirectNeighbor *neighbor;
2976 struct DistantNeighbor *referee;
2977 struct FindDestinationContext fdc;
2978 struct DisconnectContext disconnect_context;
2979 struct PendingMessage *pending_pos;
2982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2983 "%s: Receives core peer disconnect message!\n", "dv");
2986 /* Check for disconnect from self message */
2987 if (0 == memcmp(&my_identity, peer, sizeof(struct GNUNET_PeerIdentity)))
2991 GNUNET_CONTAINER_multihashmap_get (direct_neighbors, &peer->hashPubKey);
2993 if (neighbor == NULL)
2998 pending_pos = core_pending_head;
2999 while (NULL != pending_pos)
3001 if (0 == memcmp(&pending_pos->recipient, &neighbor->identity, sizeof(struct GNUNET_PeerIdentity)))
3003 GNUNET_CONTAINER_DLL_remove(core_pending_head, core_pending_tail, pending_pos);
3004 pending_pos = core_pending_head;
3007 pending_pos = pending_pos->next;
3010 while (NULL != (referee = neighbor->referee_head))
3011 distant_neighbor_free (referee);
3016 GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &find_distant_peer, &fdc);
3018 if (fdc.dest != NULL)
3020 disconnect_context.direct = neighbor;
3021 disconnect_context.distant = fdc.dest;
3022 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &schedule_disconnect_messages, &disconnect_context);
3025 GNUNET_assert (neighbor->referee_tail == NULL);
3026 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_remove (direct_neighbors,
3027 &peer->hashPubKey, neighbor))
3031 if ((neighbor->send_context != NULL) &&
3032 (neighbor->send_context->task != GNUNET_SCHEDULER_NO_TASK))
3033 GNUNET_SCHEDULER_cancel(neighbor->send_context->task);
3034 GNUNET_free (neighbor);
3039 * Process dv requests.
3041 * @param cls closure
3042 * @param server the initialized server
3043 * @param c configuration to use
3047 struct GNUNET_SERVER_Handle *server,
3048 const struct GNUNET_CONFIGURATION_Handle *c)
3050 unsigned long long max_hosts;
3053 /* FIXME: Read from config, or calculate, or something other than this! */
3054 max_hosts = DEFAULT_DIRECT_CONNECTIONS;
3055 max_table_size = DEFAULT_DV_SIZE;
3056 fisheye_depth = DEFAULT_FISHEYE_DEPTH;
3058 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "max_direct_connections"))
3059 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "max_direct_connections", &max_hosts));
3061 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "max_total_connections"))
3062 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "max_total_connections", &max_table_size));
3065 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "fisheye_depth"))
3066 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "fisheye_depth", &fisheye_depth));
3069 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3071 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MAX);
3073 direct_neighbors = GNUNET_CONTAINER_multihashmap_create (max_hosts);
3074 extended_neighbors =
3075 GNUNET_CONTAINER_multihashmap_create (max_table_size * 3);
3077 GNUNET_SERVER_add_handlers (server, plugin_handlers);
3079 GNUNET_CORE_connect (cfg,
3081 NULL, /* FIXME: anything we want to pass around? */
3083 &handle_core_connect,
3084 &handle_core_disconnect,
3092 if (coreAPI == NULL)
3095 coreMST = GNUNET_SERVER_mst_create (&tokenized_message_handler,
3098 peerinfo_handle = GNUNET_PEERINFO_connect(cfg);
3100 if (peerinfo_handle == NULL)
3102 GNUNET_CORE_disconnect(coreAPI);
3106 /* Scheduled the task to clean up when shutdown is called */
3107 cleanup_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
3114 * The main function for the dv service.
3116 * @param argc number of arguments from the command line
3117 * @param argv command line arguments
3118 * @return 0 ok, 1 on error
3121 main (int argc, char *const *argv)
3123 return (GNUNET_OK ==
3124 GNUNET_SERVICE_run (argc,
3127 GNUNET_SERVICE_OPTION_NONE,
3128 &run, NULL)) ? 0 : 1;