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 */
867 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, pending->importance, pending->timeout, &pending->recipient, pending->msg_size, &core_transmit_notify, NULL);
871 * Function called to notify a client about the socket
872 * being ready to queue more data. "buf" will be
873 * NULL and "size" zero if the socket was closed for
874 * writing in the meantime.
876 * @param cls closure (NULL)
877 * @param size number of bytes available in buf
878 * @param buf where the callee should write the message
879 * @return number of bytes written to buf
881 size_t core_transmit_notify (void *cls,
882 size_t size, void *buf)
885 struct PendingMessage *pending;
886 struct PendingMessage *client_reply;
892 /* client disconnected */
894 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "`%s': buffer was NULL\n", "DHT");
899 core_transmit_handle = NULL;
901 pending = core_pending_head;
902 if ( (pending != NULL) &&
903 (size >= (msize = ntohs (pending->msg->size))))
906 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "`%s' : transmit_notify (core) called with size %d\n", "dv service", msize);
908 GNUNET_CONTAINER_DLL_remove (core_pending_head,
911 if (pending->send_result != NULL) /* Will only be non-null if a real client asked for this send */
913 client_reply = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
914 client_reply->msg = (struct GNUNET_MessageHeader *)&client_reply[1];
915 memcpy(&client_reply[1], pending->send_result, sizeof(struct GNUNET_DV_SendResultMessage));
916 GNUNET_free(pending->send_result);
918 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, client_reply);
919 if (client_handle != NULL)
921 if (plugin_transmit_handle == NULL)
923 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
924 sizeof(struct GNUNET_DV_SendResultMessage),
925 GNUNET_TIME_UNIT_FOREVER_REL,
926 &transmit_to_plugin, NULL);
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
934 memcpy (&cbuf[off], pending->msg, msize);
935 GNUNET_free (pending);
938 /*reply = core_pending_head;*/
940 GNUNET_SCHEDULER_add_now(&try_core_send, NULL);
942 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, reply->importance, reply->timeout, &reply->recipient, reply->msg_size, &core_transmit_notify, NULL);*/
949 * Send a DV data message via DV.
951 * @param sender the original sender of the message
952 * @param recipient the next hop recipient, may be our direct peer, maybe not
953 * @param send_context the send context
956 send_message_via (const struct GNUNET_PeerIdentity *sender,
957 const struct GNUNET_PeerIdentity *recipient,
958 struct DV_SendContext *send_context)
960 p2p_dv_MESSAGE_Data *toSend;
961 unsigned int msg_size;
962 unsigned int recipient_id;
963 unsigned int sender_id;
964 struct DistantNeighbor *source;
965 struct PendingMessage *pending_message;
966 struct FindIDContext find_context;
971 msg_size = send_context->message_size + sizeof (p2p_dv_MESSAGE_Data);
973 find_context.dest = send_context->distant_peer;
974 find_context.via = recipient;
975 find_context.tid = 0;
976 GNUNET_CONTAINER_multihashmap_get_multiple (extended_neighbors, &send_context->distant_peer->hashPubKey,
977 &find_specific_id, &find_context);
979 if (find_context.tid == 0)
981 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: find_specific_id failed to find peer!\n", my_short_id);
982 /* target unknown to us, drop! */
983 return GNUNET_SYSERR;
985 recipient_id = find_context.tid;
987 if (0 == (memcmp (&my_identity,
988 sender, sizeof (struct GNUNET_PeerIdentity))))
991 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
992 &sender->hashPubKey);
994 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));
998 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
999 &sender->hashPubKey);
1002 /* sender unknown to us, drop! */
1003 return GNUNET_SYSERR;
1005 sender_id = source->our_id;
1008 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + msg_size);
1009 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1010 pending_message->send_result = send_context->send_result;
1011 memcpy(&pending_message->recipient, recipient, sizeof(struct GNUNET_PeerIdentity));
1012 pending_message->msg_size = msg_size;
1013 pending_message->importance = send_context->importance;
1014 pending_message->timeout = send_context->timeout;
1015 toSend = (p2p_dv_MESSAGE_Data *)pending_message->msg;
1016 toSend->header.size = htons (msg_size);
1017 toSend->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DATA);
1018 toSend->sender = htonl (sender_id);
1019 toSend->recipient = htonl (recipient_id);
1020 #if DEBUG_DV_MESSAGES
1021 toSend->uid = send_context->uid; /* Still sent around in network byte order */
1023 toSend->uid = htonl(0);
1026 memcpy (&toSend[1], send_context->message, send_context->message_size);
1029 memcpy(&shortname, GNUNET_i2s(send_context->distant_peer), 4);
1030 shortname[4] = '\0';
1031 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);
1034 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1039 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1045 * Given a FindLeastCostContext, and a set
1046 * of peers that match the target, return the cheapest.
1048 * @param cls closure, a struct FindLeastCostContext
1049 * @param key the key identifying the target peer
1050 * @param value the target peer
1052 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
1055 find_least_cost_peer (void *cls,
1056 const GNUNET_HashCode *key,
1059 struct FindLeastCostContext *find_context = cls;
1060 struct DistantNeighbor *dn = value;
1062 if (dn->cost < find_context->least_cost)
1064 find_context->target = dn;
1066 if (dn->cost == DIRECT_NEIGHBOR_COST)
1072 * Send a DV data message via DV.
1074 * @param recipient the ultimate recipient of this message
1075 * @param sender the original sender of the message
1076 * @param specific_neighbor the specific neighbor to send this message via
1077 * @param message the packed message
1078 * @param message_size size of the message
1079 * @param importance what priority to send this message with
1080 * @param uid the unique identifier of this message (or 0 for none)
1081 * @param timeout how long to possibly delay sending this message
1084 send_message (const struct GNUNET_PeerIdentity * recipient,
1085 const struct GNUNET_PeerIdentity * sender,
1086 const struct DistantNeighbor * specific_neighbor,
1087 const struct GNUNET_MessageHeader * message,
1088 size_t message_size,
1089 unsigned int importance,
1091 struct GNUNET_TIME_Relative timeout)
1093 p2p_dv_MESSAGE_Data *toSend;
1094 unsigned int msg_size;
1096 unsigned int recipient_id;
1097 unsigned int sender_id;
1098 struct DistantNeighbor *target;
1099 struct DistantNeighbor *source;
1100 struct PendingMessage *pending_message;
1101 struct FindLeastCostContext find_least_ctx;
1102 #if DEBUG_DV_PEER_NUMBERS
1103 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerFrom;
1104 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerTo;
1105 struct GNUNET_CRYPTO_HashAsciiEncoded encPeerVia;
1107 msg_size = message_size + sizeof (p2p_dv_MESSAGE_Data);
1109 find_least_ctx.least_cost = -1;
1110 find_least_ctx.target = NULL;
1112 * Need to find the least cost peer, lest the transport selection keep
1113 * picking the same DV route for the same destination which results
1114 * in messages looping forever. Relatively cheap, we don't iterate
1115 * over all known peers, just those that apply.
1117 GNUNET_CONTAINER_multihashmap_get_multiple (extended_neighbors,
1118 &recipient->hashPubKey, &find_least_cost_peer, &find_least_ctx);
1119 target = find_least_ctx.target;
1123 /* target unknown to us, drop! */
1124 return GNUNET_SYSERR;
1126 recipient_id = target->referrer_id;
1128 source = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
1129 &sender->hashPubKey);
1132 if (0 != (memcmp (&my_identity,
1133 sender, sizeof (struct GNUNET_PeerIdentity))))
1135 /* sender unknown to us, drop! */
1136 return GNUNET_SYSERR;
1138 sender_id = 0; /* 0 == us */
1142 /* find out the number that we use when we gossip about
1144 sender_id = source->our_id;
1147 #if DEBUG_DV_PEER_NUMBERS
1148 GNUNET_CRYPTO_hash_to_enc (&source->identity.hashPubKey, &encPeerFrom);
1149 GNUNET_CRYPTO_hash_to_enc (&target->referrer->identity.hashPubKey, &encPeerVia);
1150 encPeerFrom.encoding[4] = '\0';
1151 encPeerVia.encoding[4] = '\0';
1153 if ((sender_id != 0) && (0 == memcmp(&source->identity, &target->referrer->identity, sizeof(struct GNUNET_PeerIdentity))))
1158 cost = target->cost;
1159 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + msg_size);
1160 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1161 pending_message->send_result = NULL;
1162 pending_message->importance = importance;
1163 pending_message->timeout = timeout;
1164 memcpy(&pending_message->recipient, &target->referrer->identity, sizeof(struct GNUNET_PeerIdentity));
1165 pending_message->msg_size = msg_size;
1166 toSend = (p2p_dv_MESSAGE_Data *)pending_message->msg;
1167 toSend->header.size = htons (msg_size);
1168 toSend->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DATA);
1169 toSend->sender = htonl (sender_id);
1170 toSend->recipient = htonl (recipient_id);
1171 #if DEBUG_DV_MESSAGES
1172 toSend->uid = htonl(uid);
1174 toSend->uid = htonl(0);
1177 #if DEBUG_DV_PEER_NUMBERS
1178 GNUNET_CRYPTO_hash_to_enc (&target->identity.hashPubKey, &encPeerTo);
1179 encPeerTo.encoding[4] = '\0';
1180 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);
1182 memcpy (&toSend[1], message, message_size);
1183 if ((source != NULL) && (source->pkey == NULL)) /* Test our hypothesis about message failures! */
1185 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: Sending message, but anticipate recipient will not know sender!!!\n\n\n", my_short_id);
1187 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1192 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));
1195 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1200 struct CheckPeerContext
1205 struct DistantNeighbor *peer;
1208 * Sender id to search for
1210 unsigned int sender_id;
1214 * Iterator over hash map entries.
1216 * @param cls closure
1217 * @param key current key code
1218 * @param value value in the hash map
1219 * @return GNUNET_YES if we should continue to
1223 int checkPeerID (void *cls,
1224 const GNUNET_HashCode * key,
1227 struct CheckPeerContext *ctx = cls;
1228 struct DistantNeighbor *distant = value;
1230 if (memcmp(key, &ctx->sender_id, sizeof(unsigned int)) == 0)
1232 ctx->peer = distant;
1242 * Handler for messages parsed out by the tokenizer from
1243 * DV DATA received for this peer.
1246 * @param client the TokenizedMessageContext which contains message information
1247 * @param message the actual message
1249 void tokenized_message_handler (void *cls,
1251 const struct GNUNET_MessageHeader *message)
1253 struct TokenizedMessageContext *ctx = client;
1254 GNUNET_break_op (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_GOSSIP);
1255 GNUNET_break_op (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_DATA);
1256 if ( (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_GOSSIP) &&
1257 (ntohs (message->type) != GNUNET_MESSAGE_TYPE_DV_DATA) )
1259 #if DEBUG_DV_MESSAGES
1260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1261 "%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));
1263 GNUNET_assert(memcmp(ctx->peer, &ctx->distant->identity, sizeof(struct GNUNET_PeerIdentity)) != 0);
1264 send_to_plugin(ctx->peer, message, ntohs(message->size), &ctx->distant->identity, ctx->distant->cost);
1269 struct DelayedMessageContext
1271 struct GNUNET_PeerIdentity dest;
1272 struct GNUNET_PeerIdentity sender;
1273 struct GNUNET_MessageHeader *message;
1274 size_t message_size;
1278 void send_message_delayed (void *cls,
1279 const struct GNUNET_SCHEDULER_TaskContext *tc)
1281 struct DelayedMessageContext *msg_ctx = cls;
1282 if (msg_ctx != NULL)
1284 send_message(&msg_ctx->dest,
1288 msg_ctx->message_size,
1289 default_dv_priority,
1291 GNUNET_TIME_relative_get_forever());
1292 GNUNET_free(msg_ctx->message);
1293 GNUNET_free(msg_ctx);
1299 * Get distance information from 'atsi'.
1301 * @param atsi performance data
1302 * @return connected transport distance
1305 get_atsi_distance (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1307 while ( (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
1308 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE) )
1310 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
1313 /* FIXME: we do not have distance data? Assume direct neighbor. */
1314 return DIRECT_NEIGHBOR_COST;
1316 return ntohl (atsi->value);
1320 * Find latency information in 'atsi'.
1322 * @param atsi performance data
1323 * @return connection latency
1325 static struct GNUNET_TIME_Relative
1326 get_atsi_latency (const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1328 while ( (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR) &&
1329 (ntohl (atsi->type) != GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY) )
1331 if (ntohl (atsi->type) == GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR)
1334 /* how can we not have latency data? */
1335 return GNUNET_TIME_UNIT_SECONDS;
1337 /* FIXME: Multiply by GNUNET_TIME_UNIT_MILLISECONDS (1) to get as a GNUNET_TIME_Relative */
1338 return GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, ntohl (atsi->value));
1342 * Core handler for dv data messages. Whatever this message
1343 * contains all we really have to do is rip it out of its
1344 * DV layering and give it to our pal the DV plugin to report
1347 * @param cls closure
1348 * @param peer peer which sent the message (immediate sender)
1349 * @param message the message
1350 * @param latency the latency of the connection we received the message from
1351 * @param distance the distance to the immediate peer
1354 handle_dv_data_message (void *cls,
1355 const struct GNUNET_PeerIdentity * peer,
1356 const struct GNUNET_MessageHeader * message,
1357 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1359 const p2p_dv_MESSAGE_Data *incoming = (const p2p_dv_MESSAGE_Data *) message;
1360 const struct GNUNET_MessageHeader *packed_message;
1361 struct DirectNeighbor *dn;
1362 struct DistantNeighbor *pos;
1363 unsigned int sid; /* Sender id */
1364 unsigned int tid; /* Target id */
1365 struct GNUNET_PeerIdentity *original_sender;
1366 struct GNUNET_PeerIdentity *destination;
1367 struct FindDestinationContext fdc;
1368 struct TokenizedMessageContext tkm_ctx;
1372 struct DelayedMessageContext *delayed_context;
1375 struct CheckPeerContext checkPeerCtx;
1377 #if DEBUG_DV_MESSAGES
1381 size_t packed_message_size;
1383 uint32_t distance; /* Distance information */
1384 struct GNUNET_TIME_Relative latency; /* Latency information */
1386 packed_message_size = ntohs(incoming->header.size) - sizeof(p2p_dv_MESSAGE_Data);
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1389 "%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);
1392 if (ntohs (incoming->header.size) < sizeof (p2p_dv_MESSAGE_Data) + sizeof (struct GNUNET_MessageHeader))
1395 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1396 "`%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));
1398 return GNUNET_SYSERR;
1401 /* Iterate over ATS_Information to get distance and latency */
1402 latency = get_atsi_latency(atsi);
1403 distance = get_atsi_distance(atsi);
1404 dn = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
1409 sid = ntohl (incoming->sender);
1413 checkPeerCtx.sender_id = sid;
1414 checkPeerCtx.peer = NULL;
1415 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &checkPeerID, &checkPeerCtx);
1416 pos = checkPeerCtx.peer;
1420 pos = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
1424 pos = dn->referee_head;
1425 while ((NULL != pos) && (pos->referrer_id != sid))
1431 #if DEBUG_DV_MESSAGES
1432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1433 "%s: unknown sender (%u), Message uid %u from %s!\n", my_short_id, ntohl(incoming->sender), ntohl(incoming->uid), GNUNET_i2s(&dn->identity));
1434 pos = dn->referee_head;
1435 while ((NULL != pos) && (pos->referrer_id != sid))
1437 sender_id = strdup(GNUNET_i2s(&pos->identity));
1438 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "I know sender %u %s\n", pos->referrer_id, sender_id);
1439 GNUNET_free(sender_id);
1443 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1444 "%s: unknown sender (%u), Message uid %u from %s!\n", my_short_id, ntohl(incoming->sender), ntohl(incoming->uid), GNUNET_i2s(&dn->identity));
1447 for (i = 0; i< MAX_OUTSTANDING_MESSAGES; i++)
1449 if (dn->pending_messages[i].sender_id == 0)
1456 if (found_pos == -1)
1458 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1459 "%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));
1463 dn->pending_messages[found_pos].message = GNUNET_malloc(ntohs (message->size));
1464 memcpy(dn->pending_messages[found_pos].message, message, ntohs(message->size));
1465 dn->pending_messages[found_pos].distance = distance;
1466 dn->pending_messages[found_pos].latency = latency;
1467 memcpy(&dn->pending_messages[found_pos].sender, peer, sizeof(struct GNUNET_PeerIdentity));
1468 dn->pending_messages[found_pos].sender_id = sid;
1470 /* unknown sender */
1473 original_sender = &pos->identity;
1474 tid = ntohl (incoming->recipient);
1478 cbuf = (char *)&incoming[1];
1480 tkm_ctx.peer = peer;
1481 tkm_ctx.distant = pos;
1482 tkm_ctx.uid = ntohl(incoming->uid);
1483 if (GNUNET_OK != GNUNET_SERVER_mst_receive (coreMST,
1486 packed_message_size,
1491 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "%s: %s Received corrupt data, discarding!", my_short_id, "DV SERVICE");
1497 packed_message = (struct GNUNET_MessageHeader *)&incoming[1];
1500 /* FIXME: this is the *only* per-request operation we have in DV
1501 that is O(n) in relation to the number of connected peers; a
1502 hash-table lookup could easily solve this (minor performance
1506 GNUNET_CONTAINER_heap_iterate (neighbor_max_heap,
1507 &find_destination, &fdc);
1510 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1511 "%s: Receives %s message for someone else!\n", "dv", "DV DATA");
1514 if (fdc.dest == NULL)
1516 #if DEBUG_DV_MESSAGES
1517 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1518 "%s: Receives %s message uid %u for someone we don't know (id %u)!\n", my_short_id, "DV DATA", ntohl(incoming->uid), tid);
1522 destination = &fdc.dest->identity;
1524 if (0 == memcmp (destination, peer, sizeof (struct GNUNET_PeerIdentity)))
1526 /* FIXME: create stat: routing loop-discard! */
1528 #if DEBUG_DV_MESSAGES
1529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1530 "%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));
1535 /* At this point we have a message, and we need to forward it on to the
1538 #if DEBUG_DV_MESSAGES
1539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1540 "%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);
1544 if (GNUNET_TIME_absolute_get_duration(pos->last_gossip).abs_value < GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 2).abs_value)
1546 delayed_context = GNUNET_malloc(sizeof(struct DelayedMessageContext));
1547 memcpy(&delayed_context->dest, destination, sizeof(struct GNUNET_PeerIdentity));
1548 memcpy(&delayed_context->sender, original_sender, sizeof(struct GNUNET_PeerIdentity));
1549 delayed_context->message = GNUNET_malloc(packed_message_size);
1550 memcpy(delayed_context->message, packed_message, packed_message_size);
1551 delayed_context->message_size = packed_message_size;
1552 delayed_context->uid = ntohl(incoming->uid);
1553 GNUNET_SCHEDULER_add_delayed(GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_MILLISECONDS, 2500), &send_message_delayed, delayed_context);
1559 ret = send_message(destination,
1563 packed_message_size,
1564 default_dv_priority,
1565 ntohl(incoming->uid),
1566 GNUNET_TIME_relative_get_forever());
1568 if (ret != GNUNET_SYSERR)
1572 #if DEBUG_MESSAGE_DROP
1573 char *direct_id = GNUNET_strdup(GNUNET_i2s(&dn->identity));
1574 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1575 "%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);
1576 GNUNET_free (direct_id);
1578 return GNUNET_SYSERR;
1584 * Iterator over hash map entries.
1586 * @param cls closure (NULL)
1587 * @param key current key code
1588 * @param value value in the hash map (DistantNeighbor)
1589 * @return GNUNET_YES if we should continue to
1593 int print_neighbors (void *cls,
1594 const GNUNET_HashCode * key,
1597 struct DistantNeighbor *distant_neighbor = abs_value;
1598 char my_shortname[5];
1599 char referrer_shortname[5];
1600 memcpy(&my_shortname, GNUNET_i2s(&my_identity), 4);
1601 my_shortname[4] = '\0';
1602 memcpy(&referrer_shortname, GNUNET_i2s(&distant_neighbor->referrer->identity), 4);
1603 referrer_shortname[4] = '\0';
1605 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");
1611 * Scheduled task which gossips about known direct peers to other connected
1612 * peers. Will run until called with reason shutdown.
1615 neighbor_send_task (void *cls,
1616 const struct GNUNET_SCHEDULER_TaskContext *tc)
1618 struct NeighborSendContext *send_context = cls;
1619 #if DEBUG_DV_GOSSIP_SEND
1620 char * encPeerAbout;
1623 struct DistantNeighbor *about;
1624 struct DirectNeighbor *to;
1625 struct FastGossipNeighborList *about_list;
1627 p2p_dv_MESSAGE_NeighborInfo *message;
1628 struct PendingMessage *pending_message;
1630 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1633 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1634 "%s: Called with reason shutdown, shutting down!\n",
1635 GNUNET_i2s(&my_identity));
1640 if (send_context->fast_gossip_list_head != NULL)
1642 about_list = send_context->fast_gossip_list_head;
1643 about = about_list->about;
1644 GNUNET_CONTAINER_DLL_remove(send_context->fast_gossip_list_head,
1645 send_context->fast_gossip_list_tail,
1647 GNUNET_free(about_list);
1651 /* FIXME: this may become a problem, because the heap walk has only one internal "walker". This means
1652 * that if two neighbor_send_tasks are operating in lockstep (which is quite possible, given default
1653 * values for all connected peers) there may be a serious bias as to which peers get gossiped about!
1654 * Probably the *best* way to fix would be to have an opaque pointer to the walk position passed as
1655 * part of the walk_get_next call. Then the heap would have to keep a list of walks, or reset the walk
1656 * whenever a modification has been detected. Yuck either way. Perhaps we could iterate over the heap
1657 * once to get a list of peers to gossip about and gossip them over time... But then if one goes away
1658 * in the mean time that becomes nasty. For now we'll just assume that the walking is done
1659 * asynchronously enough to avoid major problems (-;
1661 * NOTE: probably fixed once we decided send rate based on allowed bandwidth.
1663 about = GNUNET_CONTAINER_heap_walk_get_next (neighbor_min_heap);
1665 to = send_context->toNeighbor;
1667 if ((about != NULL) && (to != about->referrer /* split horizon */ ) &&
1669 (about->hidden == GNUNET_NO) &&
1672 (0 != memcmp (&about->identity,
1673 &to->identity, sizeof (struct GNUNET_PeerIdentity))) &&
1674 (about->pkey != NULL))
1676 #if DEBUG_DV_GOSSIP_SEND
1677 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&about->identity));
1678 encPeerTo = GNUNET_strdup(GNUNET_i2s(&to->identity));
1679 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1680 "%s: Sending info about peer %s id %u to directly connected peer %s\n",
1681 GNUNET_i2s(&my_identity),
1682 encPeerAbout, about->our_id, encPeerTo);
1683 GNUNET_free(encPeerAbout);
1684 GNUNET_free(encPeerTo);
1686 about->last_gossip = GNUNET_TIME_absolute_get();
1687 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(p2p_dv_MESSAGE_NeighborInfo));
1688 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1689 pending_message->importance = default_dv_priority;
1690 pending_message->timeout = GNUNET_TIME_relative_get_forever();
1691 memcpy(&pending_message->recipient, &to->identity, sizeof(struct GNUNET_PeerIdentity));
1692 pending_message->msg_size = sizeof(p2p_dv_MESSAGE_NeighborInfo);
1693 message = (p2p_dv_MESSAGE_NeighborInfo *)pending_message->msg;
1694 message->header.size = htons (sizeof (p2p_dv_MESSAGE_NeighborInfo));
1695 message->header.type = htons (GNUNET_MESSAGE_TYPE_DV_GOSSIP);
1696 message->cost = htonl (about->cost);
1697 message->neighbor_id = htonl (about->our_id);
1699 memcpy (&message->pkey, about->pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
1700 memcpy (&message->neighbor,
1701 &about->identity, sizeof (struct GNUNET_PeerIdentity));
1703 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
1708 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
1709 /*if (core_transmit_handle == NULL)
1710 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, default_dv_priority, GNUNET_TIME_relative_get_forever(), &to->identity, sizeof(p2p_dv_MESSAGE_NeighborInfo), &core_transmit_notify, NULL);*/
1714 if (send_context->fast_gossip_list_head != NULL) /* If there are other peers in the fast list, schedule right away */
1716 #if DEBUG_DV_PEER_NUMBERS
1717 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "DV SERVICE: still in fast send mode\n");
1719 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
1723 #if DEBUG_DV_PEER_NUMBERS
1724 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "DV SERVICE: entering slow send mode\n");
1726 send_context->task = GNUNET_SCHEDULER_add_delayed(GNUNET_DV_DEFAULT_SEND_INTERVAL, &neighbor_send_task, send_context);
1734 * Handle START-message. This is the first message sent to us
1735 * by the client (can only be one!).
1737 * @param cls closure (always NULL)
1738 * @param client identification of the client
1739 * @param message the actual message
1742 handle_start (void *cls,
1743 struct GNUNET_SERVER_Client *client,
1744 const struct GNUNET_MessageHeader *message)
1748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1749 "Received `%s' request from client\n", "START");
1752 client_handle = client;
1754 GNUNET_SERVER_client_keep(client_handle);
1755 GNUNET_SERVER_receive_done (client, GNUNET_OK);
1760 * Iterate over hash map entries for a distant neighbor,
1761 * if direct neighbor matches context call send message
1763 * @param cls closure, a DV_SendContext
1764 * @param key current key code
1765 * @param value value in the hash map
1766 * @return GNUNET_YES if we should continue to
1770 int send_iterator (void *cls,
1771 const GNUNET_HashCode * key,
1774 struct DV_SendContext *send_context = cls;
1775 struct DistantNeighbor *distant_neighbor = abs_value;
1777 if (memcmp(distant_neighbor->referrer, send_context->direct_peer, sizeof(struct GNUNET_PeerIdentity)) == 0) /* They match, send and free */
1779 send_message_via(&my_identity, distant_neighbor, send_context);
1787 * Service server's handler for message send requests (which come
1788 * bubbling up to us through the DV plugin).
1790 * @param cls closure
1791 * @param client identification of the client
1792 * @param message the actual message
1794 void handle_dv_send_message (void *cls,
1795 struct GNUNET_SERVER_Client * client,
1796 const struct GNUNET_MessageHeader * message)
1798 struct GNUNET_DV_SendMessage *send_msg;
1799 struct GNUNET_DV_SendResultMessage *send_result_msg;
1800 struct PendingMessage *pending_message;
1802 size_t message_size;
1803 struct GNUNET_PeerIdentity *destination;
1804 struct GNUNET_PeerIdentity *direct;
1805 struct GNUNET_MessageHeader *message_buf;
1808 static struct GNUNET_CRYPTO_HashAsciiEncoded dest_hash;
1809 struct DV_SendContext *send_context;
1810 #if DEBUG_DV_MESSAGES
1812 struct GNUNET_MessageHeader *packed_message;
1815 if (client_handle == NULL)
1817 client_handle = client;
1818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1819 "%s: Setting initial client handle, never received `%s' message?\n", "dv", "START");
1821 else if (client_handle != client)
1823 client_handle = client;
1824 /* What should we do in this case, assert fail or just log the warning? */
1826 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1827 "%s: Setting client handle (was a different client!)!\n", "dv");
1831 GNUNET_assert(ntohs(message->size) > sizeof(struct GNUNET_DV_SendMessage));
1832 send_msg = (struct GNUNET_DV_SendMessage *)message;
1834 address_len = ntohl(send_msg->addrlen);
1835 GNUNET_assert(address_len == sizeof(struct GNUNET_PeerIdentity) * 2);
1836 message_size = ntohs(message->size) - sizeof(struct GNUNET_DV_SendMessage) - address_len;
1837 destination = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
1838 direct = GNUNET_malloc(sizeof(struct GNUNET_PeerIdentity));
1839 message_buf = GNUNET_malloc(message_size);
1841 temp_pos = (char *)&send_msg[1]; /* Set pointer to end of message */
1842 offset = 0; /* Offset starts at zero */
1844 memcpy(destination, &temp_pos[offset], sizeof(struct GNUNET_PeerIdentity));
1845 offset += sizeof(struct GNUNET_PeerIdentity);
1847 memcpy(direct, &temp_pos[offset], sizeof(struct GNUNET_PeerIdentity));
1848 offset += sizeof(struct GNUNET_PeerIdentity);
1851 memcpy(message_buf, &temp_pos[offset], message_size);
1852 if (memcmp(&send_msg->target, destination, sizeof(struct GNUNET_PeerIdentity)) != 0)
1854 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1855 dest_hash.encoding[4] = '\0';
1856 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);
1859 #if DEBUG_DV_MESSAGES
1860 cbuf = (char *)message_buf;
1862 while(offset < message_size)
1864 packed_message = (struct GNUNET_MessageHeader *)&cbuf[offset];
1865 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));
1866 offset += ntohs(packed_message->size);
1868 /*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));*/
1870 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1871 dest_hash.encoding[4] = '\0';
1872 send_context = GNUNET_malloc(sizeof(struct DV_SendContext));
1874 send_result_msg = GNUNET_malloc(sizeof(struct GNUNET_DV_SendResultMessage));
1875 send_result_msg->header.size = htons(sizeof(struct GNUNET_DV_SendResultMessage));
1876 send_result_msg->header.type = htons(GNUNET_MESSAGE_TYPE_TRANSPORT_DV_SEND_RESULT);
1877 send_result_msg->uid = send_msg->uid; /* No need to ntohl->htonl this */
1879 send_context->importance = ntohl(send_msg->priority);
1880 send_context->timeout = send_msg->timeout;
1881 send_context->direct_peer = direct;
1882 send_context->distant_peer = destination;
1883 send_context->message = message_buf;
1884 send_context->message_size = message_size;
1885 send_context->send_result = send_result_msg;
1886 #if DEBUG_DV_MESSAGES
1887 send_context->uid = send_msg->uid;
1890 if (send_message_via(&my_identity, direct, send_context) != GNUNET_YES)
1892 send_result_msg->result = htons(1);
1893 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
1894 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1895 memcpy(&pending_message[1], send_result_msg, sizeof(struct GNUNET_DV_SendResultMessage));
1896 GNUNET_free(send_result_msg);
1898 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, pending_message);
1900 if (client_handle != NULL)
1902 if (plugin_transmit_handle == NULL)
1904 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
1905 sizeof(struct GNUNET_DV_SendResultMessage),
1906 GNUNET_TIME_UNIT_FOREVER_REL,
1907 &transmit_to_plugin, NULL);
1911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
1914 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1915 dest_hash.encoding[4] = '\0';
1916 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));
1919 /* In bizarro world GNUNET_SYSERR indicates that we succeeded */
1921 if (GNUNET_SYSERR != GNUNET_CONTAINER_multihashmap_get_multiple(extended_neighbors, &destination->hashPubKey, &send_iterator, send_context))
1923 send_result_msg->result = htons(1);
1924 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(struct GNUNET_DV_SendResultMessage));
1925 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
1926 memcpy(&pending_message[1], send_result_msg, sizeof(struct GNUNET_DV_SendResultMessage));
1927 GNUNET_free(send_result_msg);
1929 GNUNET_CONTAINER_DLL_insert_after(plugin_pending_head, plugin_pending_tail, plugin_pending_tail, pending_message);
1931 if (client_handle != NULL)
1933 if (plugin_transmit_handle == NULL)
1935 plugin_transmit_handle = GNUNET_SERVER_notify_transmit_ready (client_handle,
1936 sizeof(struct GNUNET_DV_SendResultMessage),
1937 GNUNET_TIME_UNIT_FOREVER_REL,
1938 &transmit_to_plugin, NULL);
1942 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Failed to queue message for plugin, must be one in progress already!!\n");
1945 GNUNET_CRYPTO_hash_to_enc (&destination->hashPubKey, &dest_hash); /* GNUNET_i2s won't properly work, need to hash one ourselves */
1946 dest_hash.encoding[4] = '\0';
1947 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));
1950 GNUNET_free(message_buf);
1951 GNUNET_free(send_context);
1952 GNUNET_free(direct);
1953 GNUNET_free(destination);
1955 GNUNET_SERVER_receive_done(client, GNUNET_OK);
1958 /** Forward declarations **/
1959 static int handle_dv_gossip_message (void *cls,
1960 const struct GNUNET_PeerIdentity *peer,
1961 const struct GNUNET_MessageHeader *message,
1962 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
1964 static int handle_dv_disconnect_message (void *cls,
1965 const struct GNUNET_PeerIdentity *peer,
1966 const struct GNUNET_MessageHeader *message,
1967 const struct GNUNET_TRANSPORT_ATS_Information *atsi);
1968 /** End forward declarations **/
1972 * List of handlers for the messages understood by this
1975 * Hmm... will we need to register some handlers with core and
1976 * some handlers with our server here? Because core should be
1977 * getting the incoming DV messages (from whichever lower level
1978 * transport) and then our server should be getting messages
1979 * from the dv_plugin, right?
1981 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
1982 {&handle_dv_data_message, GNUNET_MESSAGE_TYPE_DV_DATA, 0},
1983 {&handle_dv_gossip_message, GNUNET_MESSAGE_TYPE_DV_GOSSIP, 0},
1984 {&handle_dv_disconnect_message, GNUNET_MESSAGE_TYPE_DV_DISCONNECT, 0},
1988 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
1989 {&handle_dv_send_message, NULL, GNUNET_MESSAGE_TYPE_TRANSPORT_DV_SEND, 0},
1990 {&handle_start, NULL, GNUNET_MESSAGE_TYPE_DV_START, 0},
1995 * Free a DistantNeighbor node, including removing it
1996 * from the referer's list.
1999 distant_neighbor_free (struct DistantNeighbor *referee)
2001 struct DirectNeighbor *referrer;
2003 referrer = referee->referrer;
2004 if (referrer != NULL)
2006 GNUNET_CONTAINER_DLL_remove (referrer->referee_head,
2007 referrer->referee_tail, referee);
2009 GNUNET_CONTAINER_heap_remove_node (neighbor_max_heap, referee->max_loc);
2010 GNUNET_CONTAINER_heap_remove_node (neighbor_min_heap, referee->min_loc);
2011 GNUNET_CONTAINER_multihashmap_remove_all (extended_neighbors,
2012 &referee->identity.hashPubKey);
2013 GNUNET_free_non_null (referee->pkey);
2014 GNUNET_free (referee);
2018 * Free a DirectNeighbor node, including removing it
2019 * from the referer's list.
2022 direct_neighbor_free (struct DirectNeighbor *direct)
2024 struct NeighborSendContext *send_context;
2025 struct FastGossipNeighborList *about_list;
2026 struct FastGossipNeighborList *prev_about;
2028 send_context = direct->send_context;
2030 if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2031 GNUNET_SCHEDULER_cancel(send_context->task);
2033 about_list = send_context->fast_gossip_list_head;
2034 while (about_list != NULL)
2036 GNUNET_CONTAINER_DLL_remove(send_context->fast_gossip_list_head, send_context->fast_gossip_list_tail, about_list);
2037 prev_about = about_list;
2038 about_list = about_list->next;
2039 GNUNET_free(prev_about);
2041 GNUNET_free(send_context);
2042 GNUNET_free(direct);
2046 * Multihashmap iterator for sending out disconnect messages
2049 * @param cls the peer that was disconnected
2050 * @param key key value stored under
2051 * @param value the direct neighbor to send disconnect to
2053 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2055 static int schedule_disconnect_messages (void *cls,
2056 const GNUNET_HashCode * key,
2059 struct DisconnectContext *disconnect_context = cls;
2060 struct DirectNeighbor *disconnected = disconnect_context->direct;
2061 struct DirectNeighbor *notify = value;
2062 struct PendingMessage *pending_message;
2063 p2p_dv_MESSAGE_Disconnect *disconnect_message;
2065 if (memcmp(¬ify->identity, &disconnected->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2066 return GNUNET_YES; /* Don't send disconnect message to peer that disconnected! */
2068 pending_message = GNUNET_malloc(sizeof(struct PendingMessage) + sizeof(p2p_dv_MESSAGE_Disconnect));
2069 pending_message->msg = (struct GNUNET_MessageHeader *)&pending_message[1];
2070 pending_message->importance = default_dv_priority;
2071 pending_message->timeout = GNUNET_TIME_relative_get_forever();
2072 memcpy(&pending_message->recipient, ¬ify->identity, sizeof(struct GNUNET_PeerIdentity));
2073 pending_message->msg_size = sizeof(p2p_dv_MESSAGE_Disconnect);
2074 disconnect_message = (p2p_dv_MESSAGE_Disconnect *)pending_message->msg;
2075 disconnect_message->header.size = htons (sizeof (p2p_dv_MESSAGE_Disconnect));
2076 disconnect_message->header.type = htons (GNUNET_MESSAGE_TYPE_DV_DISCONNECT);
2077 disconnect_message->peer_id = htonl(disconnect_context->distant->our_id);
2079 GNUNET_CONTAINER_DLL_insert_after (core_pending_head,
2084 GNUNET_SCHEDULER_add_now(try_core_send, NULL);
2085 /*if (core_transmit_handle == NULL)
2086 core_transmit_handle = GNUNET_CORE_notify_transmit_ready(coreAPI, default_dv_priority, GNUNET_TIME_relative_get_forever(), ¬ify->identity, sizeof(p2p_dv_MESSAGE_Disconnect), &core_transmit_notify, NULL);*/
2092 * Multihashmap iterator for freeing extended neighbors.
2095 * @param key key value stored under
2096 * @param value the distant neighbor to be freed
2098 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2100 static int free_extended_neighbors (void *cls,
2101 const GNUNET_HashCode * key,
2104 struct DistantNeighbor *distant = value;
2105 distant_neighbor_free(distant);
2110 * Multihashmap iterator for freeing direct neighbors.
2113 * @param key key value stored under
2114 * @param value the direct neighbor to be freed
2116 * @return GNUNET_YES to continue iteration, GNUNET_NO to stop
2118 static int free_direct_neighbors (void *cls,
2119 const GNUNET_HashCode * key,
2122 struct DirectNeighbor *direct = value;
2123 direct_neighbor_free(direct);
2129 * Task run during shutdown.
2135 shutdown_task (void *cls,
2136 const struct GNUNET_SCHEDULER_TaskContext *tc)
2139 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "calling CORE_DISCONNECT\n");
2140 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &print_neighbors, NULL);
2142 GNUNET_CONTAINER_multihashmap_iterate(extended_neighbors, &free_extended_neighbors, NULL);
2143 GNUNET_CONTAINER_multihashmap_destroy(extended_neighbors);
2144 GNUNET_CONTAINER_multihashmap_iterate(direct_neighbors, &free_direct_neighbors, NULL);
2145 GNUNET_CONTAINER_multihashmap_destroy(direct_neighbors);
2147 GNUNET_CONTAINER_heap_destroy(neighbor_max_heap);
2148 GNUNET_CONTAINER_heap_destroy(neighbor_min_heap);
2150 GNUNET_CORE_disconnect (coreAPI);
2151 GNUNET_PEERINFO_disconnect(peerinfo_handle);
2152 GNUNET_SERVER_mst_destroy(coreMST);
2153 GNUNET_free_non_null(my_short_id);
2155 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "CORE_DISCONNECT completed\n");
2160 * To be called on core init/fail.
2162 void core_init (void *cls,
2163 struct GNUNET_CORE_Handle * server,
2164 const struct GNUNET_PeerIdentity *identity,
2165 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded * publicKey)
2170 GNUNET_SCHEDULER_cancel(cleanup_task);
2171 GNUNET_SCHEDULER_add_now(&shutdown_task, NULL);
2175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2176 "%s: Core connection initialized, I am peer: %s\n", "dv", GNUNET_i2s(identity));
2178 memcpy(&my_identity, identity, sizeof(struct GNUNET_PeerIdentity));
2179 my_short_id = GNUNET_strdup(GNUNET_i2s(&my_identity));
2184 #if PKEY_NO_NEIGHBOR_ON_ADD
2186 * Iterator over hash map entries.
2188 * @param cls closure
2189 * @param key current key code
2190 * @param value value in the hash map
2191 * @return GNUNET_YES if we should continue to
2195 static int add_pkey_to_extended (void *cls,
2196 const GNUNET_HashCode * key,
2199 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey = cls;
2200 struct DistantNeighbor *distant_neighbor = abs_value;
2202 if (distant_neighbor->pkey == NULL)
2204 distant_neighbor->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2205 memcpy(distant_neighbor->pkey, pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2213 * Iterator over hash map entries.
2215 * @param cls closure
2216 * @param key current key code
2217 * @param value value in the hash map
2218 * @return GNUNET_YES if we should continue to
2222 static int update_matching_neighbors (void *cls,
2223 const GNUNET_HashCode * key,
2226 struct NeighborUpdateInfo * update_info = cls;
2227 struct DistantNeighbor *distant_neighbor = value;
2229 if (update_info->referrer == distant_neighbor->referrer) /* Direct neighbor matches, update it's info and return GNUNET_NO */
2231 /* same referrer, cost change! */
2232 GNUNET_CONTAINER_heap_update_cost (neighbor_max_heap,
2233 update_info->neighbor->max_loc, update_info->cost);
2234 GNUNET_CONTAINER_heap_update_cost (neighbor_min_heap,
2235 update_info->neighbor->min_loc, update_info->cost);
2236 update_info->neighbor->last_activity = update_info->now;
2237 update_info->neighbor->cost = update_info->cost;
2238 update_info->neighbor->referrer_id = update_info->referrer_peer_id;
2247 * Iterate over all current direct peers, add DISTANT newly connected
2248 * peer to the fast gossip list for that peer so we get DV routing
2249 * information out as fast as possible!
2251 * @param cls the newly connected neighbor we will gossip about
2252 * @param key the hashcode of the peer
2253 * @param value the direct neighbor we should gossip to
2255 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2257 static int add_distant_all_direct_neighbors (void *cls,
2258 const GNUNET_HashCode * key,
2261 struct DirectNeighbor *direct = (struct DirectNeighbor *)value;
2262 struct DistantNeighbor *distant = (struct DistantNeighbor *)cls;
2263 struct NeighborSendContext *send_context = direct->send_context;
2264 struct FastGossipNeighborList *gossip_entry;
2270 if (distant == NULL)
2275 if (memcmp(&direct->identity, &distant->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2277 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2281 if (distant->hidden == GNUNET_YES)
2282 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2284 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2285 gossip_entry->about = distant;
2287 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2288 send_context->fast_gossip_list_tail,
2289 send_context->fast_gossip_list_tail,
2292 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&distant->identity));
2293 encPeerTo = GNUNET_strdup(GNUNET_i2s(&direct->identity));
2295 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Fast send info about peer %s id %u for directly connected peer %s\n",
2296 GNUNET_i2s(&my_identity),
2297 encPeerAbout, distant->our_id, encPeerTo);
2298 GNUNET_free(encPeerAbout);
2299 GNUNET_free(encPeerTo);
2301 /*if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2302 GNUNET_SCHEDULER_cancel(send_context->task);*/
2304 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
2309 * Callback for hello address creation.
2311 * @param cls closure, a struct HelloContext
2312 * @param max maximum number of bytes that can be written to buf
2313 * @param buf where to write the address information
2315 * @return number of bytes written, 0 to signal the
2316 * end of the iteration.
2319 generate_hello_address (void *cls, size_t max, void *buf)
2321 struct HelloContext *hello_context = cls;
2327 if (hello_context->addresses_to_add == 0)
2330 /* Hello "address" will be concatenation of distant peer and direct peer identities */
2331 size = 2 * sizeof(struct GNUNET_PeerIdentity);
2332 GNUNET_assert(max >= size);
2334 addr_buffer = GNUNET_malloc(size);
2336 /* Copy the distant peer identity to buffer */
2337 memcpy(addr_buffer, &hello_context->distant_peer, sizeof(struct GNUNET_PeerIdentity));
2338 offset += sizeof(struct GNUNET_PeerIdentity);
2339 /* Copy the direct peer identity to buffer */
2340 memcpy(&addr_buffer[offset], hello_context->direct_peer, sizeof(struct GNUNET_PeerIdentity));
2341 ret = GNUNET_HELLO_add_address ("dv",
2342 GNUNET_TIME_relative_to_absolute
2343 (GNUNET_TIME_UNIT_HOURS), addr_buffer, size,
2346 hello_context->addresses_to_add--;
2348 GNUNET_free(addr_buffer);
2354 * Handles when a peer is either added due to being newly connected
2355 * or having been gossiped about, also called when the cost for a neighbor
2356 * needs to be updated.
2358 * @param peer identity of the peer whose info is being added/updated
2359 * @param pkey public key of the peer whose info is being added/updated
2360 * @param referrer_peer_id id to use when sending to 'peer'
2361 * @param referrer if this is a gossiped peer, who did we hear it from?
2362 * @param cost the cost of communicating with this peer via 'referrer'
2364 * @return the added neighbor, the updated neighbor or NULL (neighbor
2367 static struct DistantNeighbor *
2368 addUpdateNeighbor (const struct GNUNET_PeerIdentity * peer,
2369 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *pkey,
2370 unsigned int referrer_peer_id,
2371 struct DirectNeighbor *referrer, unsigned int cost)
2373 struct DistantNeighbor *neighbor;
2374 struct DistantNeighbor *max;
2375 struct GNUNET_TIME_Absolute now;
2376 struct NeighborUpdateInfo *neighbor_update;
2377 struct HelloContext *hello_context;
2378 struct GNUNET_HELLO_Message *hello_msg;
2379 unsigned int our_id;
2384 #if DEBUG_DV_PEER_NUMBERS
2386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2387 "%s Received sender id (%u)!\n", "DV SERVICE", referrer_peer_id);
2390 now = GNUNET_TIME_absolute_get ();
2391 neighbor = GNUNET_CONTAINER_multihashmap_get (extended_neighbors,
2393 neighbor_update = GNUNET_malloc(sizeof(struct NeighborUpdateInfo));
2394 neighbor_update->neighbor = neighbor;
2395 neighbor_update->cost = cost;
2396 neighbor_update->now = now;
2397 neighbor_update->referrer = referrer;
2398 neighbor_update->referrer_peer_id = referrer_peer_id;
2400 if (neighbor != NULL)
2403 memcpy(&our_id, &neighbor->identity, sizeof(unsigned int));
2405 our_id = neighbor->our_id;
2411 memcpy(&our_id, peer, sizeof(unsigned int));
2413 our_id = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_STRONG, RAND_MAX - 1) + 1;
2417 /* Either we do not know this peer, or we already do but via a different immediate peer */
2418 if ((neighbor == NULL) ||
2419 (GNUNET_CONTAINER_multihashmap_get_multiple(extended_neighbors,
2421 &update_matching_neighbors,
2422 neighbor_update) != GNUNET_SYSERR))
2426 if ((neighbor != NULL) && (cost < neighbor->cost)) /* New cost is less than old, remove old */
2428 distant_neighbor_free(neighbor);
2430 else if (neighbor != NULL) /* Only allow one DV connection to each peer */
2436 if (cost > fisheye_depth)
2439 GNUNET_free(neighbor_update);
2443 #if DEBUG_DV_PEER_NUMBERS
2444 encAbout = GNUNET_strdup(GNUNET_i2s(peer));
2445 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2446 "%s: %s Chose NEW id (%u) for peer %s!\n", GNUNET_i2s(&my_identity), "DV SERVICE", our_id, encAbout);
2447 GNUNET_free(encAbout);
2450 if (max_table_size <=
2451 GNUNET_CONTAINER_multihashmap_size (extended_neighbors))
2453 /* remove most expensive entry */
2454 max = GNUNET_CONTAINER_heap_peek (neighbor_max_heap);
2455 GNUNET_assert(max != NULL);
2456 if (cost > max->cost)
2458 /* new entry most expensive, don't create */
2459 GNUNET_free(neighbor_update);
2464 /* only free if this is not a direct connection;
2465 we could theoretically have more direct
2466 connections than DV entries allowed total! */
2467 distant_neighbor_free (max);
2471 neighbor = GNUNET_malloc (sizeof (struct DistantNeighbor));
2472 GNUNET_CONTAINER_DLL_insert (referrer->referee_head,
2473 referrer->referee_tail, neighbor);
2474 neighbor->max_loc = GNUNET_CONTAINER_heap_insert (neighbor_max_heap,
2476 neighbor->min_loc = GNUNET_CONTAINER_heap_insert (neighbor_min_heap,
2478 neighbor->referrer = referrer;
2479 memcpy (&neighbor->identity, peer, sizeof (struct GNUNET_PeerIdentity));
2480 if (pkey != NULL) /* pkey will be null on direct neighbor addition */
2482 neighbor->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2483 memcpy (neighbor->pkey, pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2486 neighbor->pkey = pkey;
2488 neighbor->last_activity = now;
2489 neighbor->cost = cost;
2490 neighbor->referrer_id = referrer_peer_id;
2491 neighbor->our_id = our_id;
2493 (cost == DIRECT_NEIGHBOR_COST) ? (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, 4) ==
2496 GNUNET_CONTAINER_multihashmap_put (extended_neighbors, &peer->hashPubKey,
2498 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2499 if (referrer_peer_id != 0)
2501 for (i = 0; i< MAX_OUTSTANDING_MESSAGES; i++)
2503 if (referrer->pending_messages[i].sender_id == referrer_peer_id) /* We have a queued message from just learned about peer! */
2505 #if DEBUG_DV_MESSAGES
2506 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);
2508 struct GNUNET_TRANSPORT_ATS_Information atsi[3];
2509 atsi[0].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DISTANCE);
2510 atsi[0].value = htonl (referrer->pending_messages[i].distance);
2511 atsi[1].type = htonl (GNUNET_TRANSPORT_ATS_QUALITY_NET_DELAY);
2512 atsi[1].value = htonl ((uint32_t)referrer->pending_messages[i].latency.rel_value);
2513 atsi[2].type = htonl (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR);
2514 atsi[2].value = htonl (0);
2515 handle_dv_data_message(NULL,
2516 &referrer->pending_messages[i].sender,
2517 referrer->pending_messages[i].message,
2518 (const struct GNUNET_TRANSPORT_ATS_Information *)&atsi);
2519 GNUNET_free(referrer->pending_messages[i].message);
2520 referrer->pending_messages[i].sender_id = 0;
2524 if ((cost != DIRECT_NEIGHBOR_COST) && (neighbor->pkey != NULL))
2526 /* Added neighbor, now send HELLO to transport */
2527 hello_context = GNUNET_malloc(sizeof(struct HelloContext));
2528 hello_context->direct_peer = &referrer->identity;
2529 memcpy(&hello_context->distant_peer, peer, sizeof(struct GNUNET_PeerIdentity));
2530 hello_context->addresses_to_add = 1;
2531 hello_msg = GNUNET_HELLO_create(pkey, &generate_hello_address, hello_context);
2532 GNUNET_assert(memcmp(hello_context->direct_peer, &hello_context->distant_peer, sizeof(struct GNUNET_PeerIdentity)) != 0);
2533 addr1 = GNUNET_strdup(GNUNET_i2s(hello_context->direct_peer));
2534 addr2 = GNUNET_strdup(GNUNET_i2s(&hello_context->distant_peer));
2536 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);
2540 send_to_plugin(hello_context->direct_peer, GNUNET_HELLO_get_header(hello_msg), GNUNET_HELLO_size(hello_msg), &hello_context->distant_peer, cost);
2541 GNUNET_free(hello_context);
2542 GNUNET_free(hello_msg);
2549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2550 "%s: Already know peer %s distance %d, referrer id %d!\n", "dv", GNUNET_i2s(peer), cost, referrer_peer_id);
2554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2555 "%s: Size of extended_neighbors is %d\n", "dv", GNUNET_CONTAINER_multihashmap_size(extended_neighbors));
2558 GNUNET_free(neighbor_update);
2564 * Core handler for dv disconnect messages. These will be used
2565 * by us to tell transport via the dv plugin that a peer can
2566 * no longer be contacted by us via a certain address. We should
2567 * then propagate these messages on, given that the distance to
2568 * the peer indicates we would have gossiped about it to others.
2570 * @param cls closure
2571 * @param peer peer which sent the message (immediate sender)
2572 * @param message the message
2573 * @param atsi performance data
2575 static int handle_dv_disconnect_message (void *cls,
2576 const struct GNUNET_PeerIdentity *peer,
2577 const struct GNUNET_MessageHeader *message,
2578 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2580 struct DirectNeighbor *referrer;
2581 struct DistantNeighbor *distant;
2582 p2p_dv_MESSAGE_Disconnect *enc_message = (p2p_dv_MESSAGE_Disconnect *)message;
2584 if (ntohs (message->size) < sizeof (p2p_dv_MESSAGE_Disconnect))
2586 return GNUNET_SYSERR; /* invalid message */
2589 referrer = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
2591 if (referrer == NULL)
2594 distant = referrer->referee_head;
2595 while (distant != NULL)
2597 if (distant->referrer_id == ntohl(enc_message->peer_id))
2599 distant_neighbor_free(distant);
2600 distant = referrer->referee_head;
2603 distant = distant->next;
2611 * Core handler for dv gossip messages. These will be used
2612 * by us to create a HELLO message for the newly peer containing
2613 * which direct peer we can connect through, and what the cost
2614 * is. This HELLO will then be scheduled for validation by the
2615 * transport service so that it can be used by all others.
2617 * @param cls closure
2618 * @param peer peer which sent the message (immediate sender)
2619 * @param message the message
2620 * @param atsi performance data
2623 handle_dv_gossip_message (void *cls,
2624 const struct GNUNET_PeerIdentity *peer,
2625 const struct GNUNET_MessageHeader *message,
2626 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2628 struct DirectNeighbor *referrer;
2629 p2p_dv_MESSAGE_NeighborInfo *enc_message = (p2p_dv_MESSAGE_NeighborInfo *)message;
2631 if (ntohs (message->size) < sizeof (p2p_dv_MESSAGE_NeighborInfo))
2633 return GNUNET_SYSERR; /* invalid message */
2636 #if DEBUG_DV_GOSSIP_RECEIPT
2637 char * encPeerAbout;
2640 encPeerAbout = GNUNET_strdup(GNUNET_i2s(&enc_message->neighbor));
2641 encPeerFrom = GNUNET_strdup(GNUNET_i2s(peer));
2642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2643 "%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);
2644 GNUNET_free(encPeerAbout);
2645 GNUNET_free(encPeerFrom);
2648 referrer = GNUNET_CONTAINER_multihashmap_get (direct_neighbors,
2650 if (referrer == NULL)
2653 addUpdateNeighbor (&enc_message->neighbor, &enc_message->pkey,
2654 ntohl (enc_message->neighbor_id),
2655 referrer, ntohl (enc_message->cost) + 1);
2662 * Iterate over all currently known peers, add them to the
2663 * fast gossip list for this peer so we get DV routing information
2664 * out as fast as possible!
2666 * @param cls the direct neighbor we will gossip to
2667 * @param key the hashcode of the peer
2668 * @param value the distant neighbor we should add to the list
2670 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2673 add_all_extended_peers (void *cls,
2674 const GNUNET_HashCode * key,
2677 struct NeighborSendContext *send_context = (struct NeighborSendContext *)cls;
2678 struct DistantNeighbor *distant = (struct DistantNeighbor *)value;
2679 struct FastGossipNeighborList *gossip_entry;
2681 if (memcmp(&send_context->toNeighbor->identity, &distant->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2682 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2685 if (distant->hidden == GNUNET_YES)
2686 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2688 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2689 gossip_entry->about = distant;
2691 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2692 send_context->fast_gossip_list_tail,
2693 send_context->fast_gossip_list_tail,
2701 * Iterator over hash map entries.
2703 * @param cls closure
2704 * @param key current key code
2705 * @param value value in the hash map
2706 * @return GNUNET_YES if we should continue to
2711 gossip_all_to_all_iterator (void *cls,
2712 const GNUNET_HashCode * key,
2715 struct DirectNeighbor *direct = abs_value;
2717 GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &add_all_extended_peers, direct->send_context);
2719 if (direct->send_context->task != GNUNET_SCHEDULER_NO_TASK)
2720 GNUNET_SCHEDULER_cancel(direct->send_context->task);
2722 direct->send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, direct->send_context);
2727 * Task run during shutdown.
2733 gossip_all_to_all (void *cls,
2734 const struct GNUNET_SCHEDULER_TaskContext *tc)
2736 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &gossip_all_to_all_iterator, NULL);
2738 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5),
2745 * Iterate over all current direct peers, add newly connected peer
2746 * to the fast gossip list for that peer so we get DV routing
2747 * information out as fast as possible!
2749 * @param cls the newly connected neighbor we will gossip about
2750 * @param key the hashcode of the peer
2751 * @param value the direct neighbor we should gossip to
2753 * @return GNUNET_YES to continue iteration, GNUNET_NO otherwise
2756 add_all_direct_neighbors (void *cls,
2757 const GNUNET_HashCode * key,
2760 struct DirectNeighbor *direct = (struct DirectNeighbor *)value;
2761 struct DirectNeighbor *to = (struct DirectNeighbor *)cls;
2762 struct DistantNeighbor *distant;
2763 struct NeighborSendContext *send_context = direct->send_context;
2764 struct FastGossipNeighborList *gossip_entry;
2768 distant = GNUNET_CONTAINER_multihashmap_get(extended_neighbors, &to->identity.hashPubKey);
2769 if (distant == NULL)
2774 if (memcmp(&direct->identity, &to->identity, sizeof(struct GNUNET_PeerIdentity)) == 0)
2776 return GNUNET_YES; /* Don't gossip to a peer about itself! */
2780 if (distant->hidden == GNUNET_YES)
2781 return GNUNET_YES; /* This peer should not be gossipped about (hidden) */
2783 direct_id = GNUNET_strdup(GNUNET_i2s(&direct->identity));
2785 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);
2787 GNUNET_free(direct_id);
2788 gossip_entry = GNUNET_malloc(sizeof(struct FastGossipNeighborList));
2789 gossip_entry->about = distant;
2791 GNUNET_CONTAINER_DLL_insert_after(send_context->fast_gossip_list_head,
2792 send_context->fast_gossip_list_tail,
2793 send_context->fast_gossip_list_tail,
2795 if (send_context->task != GNUNET_SCHEDULER_NO_TASK)
2796 GNUNET_SCHEDULER_cancel(send_context->task);
2798 send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, send_context);
2799 //tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
2800 //neighbor_send_task(send_context, &tc);
2805 * Type of an iterator over the hosts. Note that each
2806 * host will be called with each available protocol.
2808 * @param cls closure
2809 * @param peer id of the peer, NULL for last call
2810 * @param hello hello message for the peer (can be NULL)
2813 process_peerinfo (void *cls,
2814 const struct GNUNET_PeerIdentity *peer,
2815 const struct GNUNET_HELLO_Message *hello)
2817 struct PeerIteratorContext *peerinfo_iterator = cls;
2818 struct DirectNeighbor *neighbor = peerinfo_iterator->neighbor;
2819 struct DistantNeighbor *distant = peerinfo_iterator->distant;
2820 #if DEBUG_DV_PEER_NUMBERS
2827 if (distant->pkey == NULL)
2830 GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Failed to get peerinfo information for this peer, retrying!\n");
2832 peerinfo_iterator->ic = GNUNET_PEERINFO_iterate(peerinfo_handle,
2833 &peerinfo_iterator->neighbor->identity,
2834 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3),
2840 GNUNET_free(peerinfo_iterator);
2845 if (memcmp(&neighbor->identity, peer, sizeof(struct GNUNET_PeerIdentity) != 0))
2848 if ((hello != NULL) && (GNUNET_HELLO_get_key (hello, &neighbor->pkey) == GNUNET_OK))
2850 if (distant->pkey == NULL)
2852 distant->pkey = GNUNET_malloc(sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2853 memcpy(distant->pkey, &neighbor->pkey, sizeof(struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2856 sent = GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &add_all_extended_peers, neighbor->send_context);
2859 GNUNET_STATISTICS_update (stats, "# distant peers gossiped to direct neighbors", sent, GNUNET_NO);
2861 #if DEBUG_DV_PEER_NUMBERS
2862 neighbor_pid = GNUNET_strdup(GNUNET_i2s(&neighbor->identity));
2863 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Gossipped %d extended peers to %s\n", GNUNET_i2s(&my_identity), sent, neighbor_pid);
2865 sent = GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &add_all_direct_neighbors, neighbor);
2868 GNUNET_STATISTICS_update (stats, "# direct peers gossiped to direct neighbors", sent, GNUNET_NO);
2870 #if DEBUG_DV_PEER_NUMBERS
2871 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "%s: Gossipped about %s to %d direct peers\n", GNUNET_i2s(&my_identity), neighbor_pid, sent);
2872 GNUNET_free(neighbor_pid);
2874 neighbor->send_context->task = GNUNET_SCHEDULER_add_now(&neighbor_send_task, neighbor->send_context);
2880 * Method called whenever a peer connects.
2882 * @param cls closure
2883 * @param peer peer identity this notification is about
2884 * @param atsi performance data
2887 handle_core_connect (void *cls,
2888 const struct GNUNET_PeerIdentity * peer,
2889 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2891 struct DirectNeighbor *neighbor;
2892 struct DistantNeighbor *about;
2893 struct PeerIteratorContext *peerinfo_iterator;
2896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2897 "%s: Receives core connect message for peer %s distance %d!\n", "dv", GNUNET_i2s(peer), distance);
2901 distance = get_atsi_distance (atsi);
2902 if ((distance == DIRECT_NEIGHBOR_COST) &&
2903 (GNUNET_CONTAINER_multihashmap_get(direct_neighbors, &peer->hashPubKey) == NULL))
2905 peerinfo_iterator = GNUNET_malloc(sizeof(struct PeerIteratorContext));
2906 neighbor = GNUNET_malloc (sizeof (struct DirectNeighbor));
2907 neighbor->send_context = GNUNET_malloc(sizeof(struct NeighborSendContext));
2908 neighbor->send_context->toNeighbor = neighbor;
2909 memcpy (&neighbor->identity, peer, sizeof (struct GNUNET_PeerIdentity));
2911 GNUNET_assert(GNUNET_SYSERR != GNUNET_CONTAINER_multihashmap_put (direct_neighbors,
2913 neighbor, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
2914 about = addUpdateNeighbor (peer, NULL, 0, neighbor, DIRECT_NEIGHBOR_COST);
2915 peerinfo_iterator->distant = about;
2916 peerinfo_iterator->neighbor = neighbor;
2917 peerinfo_iterator->ic = GNUNET_PEERINFO_iterate (peerinfo_handle,
2919 GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3),
2923 if ((about != NULL) && (about->pkey == NULL))
2926 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Newly added peer %s has NULL pkey!\n", GNUNET_i2s(peer));
2929 else if (about != NULL)
2931 GNUNET_free(peerinfo_iterator);
2936 about = GNUNET_CONTAINER_multihashmap_get(extended_neighbors, &peer->hashPubKey);
2937 if ((GNUNET_CONTAINER_multihashmap_get(direct_neighbors, &peer->hashPubKey) == NULL) && (about != NULL))
2939 sent = GNUNET_CONTAINER_multihashmap_iterate(direct_neighbors, &add_distant_all_direct_neighbors, about);
2942 GNUNET_STATISTICS_update (stats, "# direct peers gossiped to new direct neighbors", sent, GNUNET_NO);
2946 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2947 "%s: Distance (%d) greater than %d or already know about peer (%s), not re-adding!\n", "dv", distance, DIRECT_NEIGHBOR_COST, GNUNET_i2s(peer));
2954 * Method called whenever a given peer disconnects.
2956 * @param cls closure
2957 * @param peer peer identity this notification is about
2959 void handle_core_disconnect (void *cls,
2960 const struct GNUNET_PeerIdentity * peer)
2962 struct DirectNeighbor *neighbor;
2963 struct DistantNeighbor *referee;
2964 struct FindDestinationContext fdc;
2965 struct DisconnectContext disconnect_context;
2968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2969 "%s: Receives core peer disconnect message!\n", "dv");
2973 GNUNET_CONTAINER_multihashmap_get (direct_neighbors, &peer->hashPubKey);
2974 if (neighbor == NULL)
2978 while (NULL != (referee = neighbor->referee_head))
2979 distant_neighbor_free (referee);
2984 GNUNET_CONTAINER_multihashmap_iterate (extended_neighbors, &find_distant_peer, &fdc);
2986 if (fdc.dest != NULL)
2988 disconnect_context.direct = neighbor;
2989 disconnect_context.distant = fdc.dest;
2990 GNUNET_CONTAINER_multihashmap_iterate (direct_neighbors, &schedule_disconnect_messages, &disconnect_context);
2993 GNUNET_assert (neighbor->referee_tail == NULL);
2994 if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_remove (direct_neighbors,
2995 &peer->hashPubKey, neighbor))
2999 if ((neighbor->send_context != NULL) && (neighbor->send_context->task != GNUNET_SCHEDULER_NO_TASK))
3000 GNUNET_SCHEDULER_cancel(neighbor->send_context->task);
3001 GNUNET_free (neighbor);
3006 * Process dv requests.
3008 * @param cls closure
3009 * @param server the initialized server
3010 * @param c configuration to use
3014 struct GNUNET_SERVER_Handle *server,
3015 const struct GNUNET_CONFIGURATION_Handle *c)
3017 unsigned long long max_hosts;
3020 /* FIXME: Read from config, or calculate, or something other than this! */
3021 max_hosts = DEFAULT_DIRECT_CONNECTIONS;
3022 max_table_size = DEFAULT_DV_SIZE;
3023 fisheye_depth = DEFAULT_FISHEYE_DEPTH;
3025 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "max_direct_connections"))
3026 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "max_direct_connections", &max_hosts));
3028 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "max_total_connections"))
3029 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "max_total_connections", &max_table_size));
3032 if (GNUNET_CONFIGURATION_have_value(cfg, "dv", "fisheye_depth"))
3033 GNUNET_assert(GNUNET_OK == GNUNET_CONFIGURATION_get_value_number(cfg, "dv", "fisheye_depth", &fisheye_depth));
3036 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
3038 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MAX);
3040 direct_neighbors = GNUNET_CONTAINER_multihashmap_create (max_hosts);
3041 extended_neighbors =
3042 GNUNET_CONTAINER_multihashmap_create (max_table_size * 3);
3044 GNUNET_SERVER_add_handlers (server, plugin_handlers);
3046 GNUNET_CORE_connect (cfg,
3048 NULL, /* FIXME: anything we want to pass around? */
3050 &handle_core_connect,
3051 &handle_core_disconnect,
3059 if (coreAPI == NULL)
3062 coreMST = GNUNET_SERVER_mst_create (&tokenized_message_handler,
3065 peerinfo_handle = GNUNET_PEERINFO_connect(cfg);
3067 if (peerinfo_handle == NULL)
3069 GNUNET_CORE_disconnect(coreAPI);
3073 /* Scheduled the task to clean up when shutdown is called */
3074 cleanup_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL,
3081 * The main function for the dv service.
3083 * @param argc number of arguments from the command line
3084 * @param argv command line arguments
3085 * @return 0 ok, 1 on error
3088 main (int argc, char *const *argv)
3090 return (GNUNET_OK ==
3091 GNUNET_SERVICE_run (argc,
3094 GNUNET_SERVICE_OPTION_NONE,
3095 &run, NULL)) ? 0 : 1;