2 This file is part of GNUnet.
3 (C) 2001 - 2011 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 mesh/gnunet-service-mesh.c
23 * @brief GNUnet MESH service
24 * @author Bartlomiej Polot
30 * - PERIODIC FUNCTIONS
31 * - MESH NETWORK HANDLER HELPERS
32 * - MESH NETWORK HANDLES
33 * - MESH LOCAL HANDLER HELPERS
34 * - MESH LOCAL HANDLES
35 * - MAIN FUNCTIONS (main & run)
38 * - error reporting (CREATE/CHANGE/ADD/DEL?) -- new message!
39 * - partial disconnect reporting -- same as error reporting?
40 * - add vs create? change vs. keep-alive? same msg or different ones? -- thinking...
41 * - speed requirement specification (change?) in mesh API -- API call
43 * - add connection confirmation message
44 * - handle trnsmt_rdy return values
48 #include "gnunet_common.h"
49 #include "gnunet_util_lib.h"
50 #include "gnunet_peer_lib.h"
51 #include "gnunet_core_service.h"
52 #include "gnunet_protocols.h"
55 #include "mesh_protocol.h"
56 #include "gnunet_dht_service.h"
58 #define MESH_DEBUG GNUNET_YES
62 * GNUNET_SCHEDULER_Task for printing a message after some operation is done
63 * @param cls string to print
64 * @param tc task context
67 mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
71 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
75 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", s);
79 /* TODO: move into configuration file */
80 #define CORE_QUEUE_SIZE 10
81 #define LOCAL_QUEUE_SIZE 100
82 #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\
83 GNUNET_TIME_UNIT_SECONDS,\
85 #define APP_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
86 GNUNET_TIME_UNIT_SECONDS,\
89 #define ID_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
90 GNUNET_TIME_UNIT_SECONDS,\
93 /******************************************************************************/
94 /************************ ENUMERATIONS ****************************/
95 /******************************************************************************/
98 * All the states a peer participating in a tunnel can be in.
103 * Peer only retransmits traffic, is not a final destination
108 * Path to the peer not known yet
113 * Request sent, not yet answered.
118 * Peer connected and ready to accept data
123 * Peer connected previosly but not responding
125 MESH_PEER_RECONNECTING
129 /******************************************************************************/
130 /************************ DATA STRUCTURES ****************************/
131 /******************************************************************************/
134 * Information regarding a possible path to reach a single peer
142 struct MeshPeerPath *next;
143 struct MeshPeerPath *prev;
146 * List of all the peers that form the path from origin to target.
148 GNUNET_PEER_Id *peers;
151 * Number of peers (hops) in the path
159 * Node of path tree for a tunnel
161 struct MeshTunnelPathNode
164 * Tunnel this node belongs to (and therefore tree)
166 struct MeshTunnel *t;
169 * Peer this node describes
171 struct MeshPeerInfo *peer;
174 * Parent node in the tree
176 struct MeshTunnelPathNode *parent;
181 struct MeshTunnelPathNode *children;
186 unsigned int nchildren;
189 * Status of the peer in the tunnel
191 enum MeshPeerState status;
196 * Tree to reach all peers in the tunnel
198 struct MeshTunnelPath
201 * Tunnel this path belongs to
203 struct MeshTunnel *t;
206 * Root node of peer tree
208 struct MeshTunnelPathNode *root;
211 * Node that represents our position in the tree (for non local tunnels)
213 struct MeshTunnelPathNode *me;
216 * Cache of all peers and the first hop to them.
217 * Indexed by Peer_Identity, contains a pointer to the PeerInfo of 1st hop.
219 struct GNUNET_CONTAINER_MultiHashMap *first_hops;
224 /** FWD declaration */
228 * Struct containing all info possibly needed to build a package when called
231 struct MeshDataDescriptor
233 /** ID of the tunnel this packet travels in */
234 struct MESH_TunnelID *origin;
236 /** Ultimate destination of the packet */
237 GNUNET_PEER_Id destination;
239 /** Number of identical messages sent to different hops (multicast) */
242 /** Size of the data */
245 /** Client that asked for the transmission, if any */
246 struct GNUNET_SERVER_Client *client;
248 /** Who was is message being sent to */
249 struct MeshPeerInfo *peer;
251 /** Which handler was used to request the transmission */
252 unsigned int handler_n;
254 /* Data at the end */
259 * Struct containing all information regarding a given peer
269 * Last time we heard from this peer
271 struct GNUNET_TIME_Absolute last_contact;
274 * Number of attempts to reconnect so far
276 int n_reconnect_attempts;
279 * Paths to reach the peer, ordered by ascending hop count
281 struct MeshPeerPath *path_head;
284 * Paths to reach the peer, ordered by ascending hop count
286 struct MeshPeerPath *path_tail;
289 * Handle to stop the DHT search for a path to this peer
291 struct GNUNET_DHT_GetHandle *dhtget;
294 * Handles to stop queued transmissions for this peer
296 struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE];
299 * Pointer to info stuctures used as cls for queued transmissions
301 struct MeshDataDescriptor *infos[CORE_QUEUE_SIZE];
304 * Array of tunnels this peer participates in
305 * (most probably a small amount, therefore not a hashmap)
306 * When the path to the peer changes, notify these tunnels to let them
307 * re-adjust their path trees.
309 struct MeshTunnel **tunnels;
312 * Number of tunnels above
314 unsigned int ntunnels;
319 * Data scheduled to transmit (to local client or remote peer)
326 struct MeshQueue *next;
327 struct MeshQueue *prev;
330 * Target of the data (NULL if target is client)
332 struct MeshPeerInfo *peer;
335 * Client to send the data to (NULL if target is peer)
337 struct MeshClient *client;
340 * Size of the message to transmit
345 * How old is the data?
347 struct GNUNET_TIME_Absolute timestamp;
352 struct GNUNET_MessageHeader *data;
356 * Globally unique tunnel identification (owner + number)
357 * DO NOT USE OVER THE NETWORK
362 * Node that owns the tunnel
367 * Tunnel number to differentiate all the tunnels owned by the node oid
368 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
370 MESH_TunnelNumber tid;
374 struct MeshClient; /* FWD declaration */
377 * Struct containing all information regarding a tunnel
378 * For an intermediate node the improtant info used will be:
379 * - id Tunnel unique identification
380 * - paths[0] To know where to send it next
381 * - metainfo: ready, speeds, accounting
388 struct MESH_TunnelID id;
391 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
393 MESH_TunnelNumber local_tid;
396 * Last time the tunnel was used
398 struct GNUNET_TIME_Absolute timestamp;
401 * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo)
403 struct GNUNET_CONTAINER_MultiHashMap *peers;
406 * Number of peers that are connected and potentially ready to receive data
408 unsigned int peers_ready;
411 * Number of peers that have been added to the tunnel
413 unsigned int peers_total;
416 * Client owner of the tunnel, if any
418 struct MeshClient *client;
421 * Messages ready to transmit
423 struct MeshQueue *queue_head;
424 struct MeshQueue *queue_tail;
429 struct MeshTunnelPath *paths;
432 * Task to keep the used paths alive
434 GNUNET_SCHEDULER_TaskIdentifier path_refresh_task;
439 * Info needed to work with tunnel paths and peers
446 struct MeshTunnel *t;
451 struct MeshPeerInfo *peer;
456 struct MeshPeerPath *path;
461 * Struct containing information about a client of the service
468 struct MeshClient *next;
469 struct MeshClient *prev;
472 * Tunnels that belong to this client, indexed by local id
474 struct GNUNET_CONTAINER_MultiHashMap *tunnels;
477 * Handle to communicate with the client
479 struct GNUNET_SERVER_Client *handle;
482 * Applications that this client has claimed to provide
484 struct GNUNET_CONTAINER_MultiHashMap *apps;
487 * Messages that this client has declared interest in
489 struct GNUNET_CONTAINER_MultiHashMap *types;
492 * Used to search peers offering a service
494 struct GNUNET_DHT_GetHandle *dht_get_type;
498 /******************************************************************************/
499 /*********************** GLOBAL VARIABLES ****************************/
500 /******************************************************************************/
505 static struct MeshClient *clients;
506 static struct MeshClient *clients_tail;
509 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel)
511 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
514 * Peers known, indexed by PeerIdentity (MeshPeerInfo)
516 static struct GNUNET_CONTAINER_MultiHashMap *peers;
519 * Handle to communicate with core
521 static struct GNUNET_CORE_Handle *core_handle;
526 static struct GNUNET_DHT_Handle *dht_handle;
531 static struct GNUNET_SERVER_Handle *server_handle;
534 * Notification context, to send messages to local clients
536 static struct GNUNET_SERVER_NotificationContext *nc;
539 * Local peer own ID (memory efficient handle)
541 static GNUNET_PEER_Id myid;
544 * Local peer own ID (full value)
546 static struct GNUNET_PeerIdentity my_full_id;
549 * Tunnel ID for the next created tunnel (global tunnel number)
551 static MESH_TunnelNumber next_tid;
554 * All application types provided by this peer
556 static struct GNUNET_CONTAINER_MultiHashMap *applications;
559 * All message types clients of this peer are interested in
561 static struct GNUNET_CONTAINER_MultiHashMap *types;
564 * Task to periodically announce provided applications
566 GNUNET_SCHEDULER_TaskIdentifier announce_applications_task;
569 * Task to periodically announce itself in the network
571 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
574 /******************************************************************************/
575 /************************ PERIODIC FUNCTIONS ****************************/
576 /******************************************************************************/
579 * Announce iterator over for each application provided by the peer
582 * @param key current key code
583 * @param value value in the hash map
584 * @return GNUNET_YES if we should continue to
589 announce_application (void *cls, const GNUNET_HashCode * key, void *value)
591 /* FIXME are hashes in multihash map equal on all aquitectures? */
592 GNUNET_DHT_put (dht_handle, key, 10U, GNUNET_DHT_RO_RECORD_ROUTE,
593 GNUNET_BLOCK_TYPE_TEST, sizeof (struct GNUNET_PeerIdentity),
594 (const char *) &my_full_id,
596 GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_REL,
597 &mesh_debug, "DHT_put for app completed");
599 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
609 * Periodically announce what applications are provided by local clients
612 * @param tc task context
615 announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
617 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
619 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
622 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for apps\n");
623 GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application,
625 announce_applications_task =
626 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications,
628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Finished PUT for apps\n");
634 * Periodically announce self id in the DHT
637 * @param tc task context
640 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
642 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
644 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
648 * - Set data expiration in function of X
651 GNUNET_DHT_put (dht_handle, /* DHT handle */
652 &my_full_id.hashPubKey, /* Key to use */
653 10U, /* Replication level */
654 GNUNET_DHT_RO_RECORD_ROUTE, /* DHT options */
655 GNUNET_BLOCK_TYPE_TEST, /* Block type */
656 0, /* Size of the data */
657 NULL, /* Data itself */
658 GNUNET_TIME_absolute_get_forever (), /* Data expiration */
659 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
661 &mesh_debug, "DHT_put for id completed");
663 NULL, /* Continuation */
664 NULL); /* Continuation closure */
667 GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls);
672 * Send keepalive packets for a peer
680 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
682 struct MeshTunnel *t = cls;
683 // struct GNUNET_PeerIdentity id;
685 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
689 /* FIXME implement multicast keepalive. Just an empty multicast packet? */
690 // GNUNET_PEER_resolve (path_get_first_hop (path->t, path->peer)->id, &id);
691 // GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
692 // GNUNET_TIME_UNIT_FOREVER_REL, &id,
693 // sizeof (struct GNUNET_MESH_ManipulatePath)
695 // (path->path->length *
696 // sizeof (struct GNUNET_PeerIdentity)),
697 // &send_core_create_path,
699 t->path_refresh_task =
700 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh,
706 /******************************************************************************/
707 /****************** GENERAL HELPER FUNCTIONS ************************/
708 /******************************************************************************/
711 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
712 * and insert it in the appropiate structures if the peer is not known yet.
714 * @param peer Identity of the peer
716 * @return Existing or newly created peer info
718 static struct MeshPeerInfo *
719 peer_info_get (const struct GNUNET_PeerIdentity *peer)
721 struct MeshPeerInfo *peer_info;
723 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
724 if (NULL == peer_info)
727 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
728 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
729 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
730 peer_info->id = GNUNET_PEER_intern (peer);
739 * Destroy the peer_info and free any allocated resources linked to it
740 * @param t tunnel the path belongs to
741 * @param pi the peer_info to destroy
742 * @return GNUNET_OK on success
745 peer_info_destroy (struct MeshPeerInfo *pi)
747 GNUNET_HashCode hash;
748 struct GNUNET_PeerIdentity id;
750 GNUNET_PEER_resolve (pi->id, &id);
751 GNUNET_PEER_change_rc (pi->id, -1);
752 GNUNET_CRYPTO_hash (&id, sizeof (struct GNUNET_PeerIdentity), &hash);
754 GNUNET_CONTAINER_multihashmap_remove (peers, &hash, pi);
755 GNUNET_SCHEDULER_cancel (pi->path_refresh_task);
763 * Destroy the path and free any allocated resources linked to it
765 * @param p the path to destroy
767 * @return GNUNET_OK on success
770 path_destroy (struct MeshPeerPath *p)
772 GNUNET_PEER_decrement_rcs (p->peers, p->length);
773 GNUNET_free (p->peers);
780 * Find the first peer whom to send a packet to go down this path
782 * @param t The tunnel to use
783 * @param peer The peerinfo of the peer we are trying to reach
785 * @return peerinfo of the peer who is the first hop in the tunnel
788 static struct MeshPeerInfo *
789 path_get_first_hop (struct MeshTunnel *t, struct MeshPeerInfo *peer)
791 struct GNUNET_PeerIdentity id;
793 GNUNET_PEER_resolve(peer->id, &id);
794 return GNUNET_CONTAINER_multihashmap_get(t->paths->first_hops,
800 * Get the length of a path
802 * @param path The path to measure, with the local peer at any point of it
804 * @return Number of hops to reach destination
805 * UINT_MAX in case the peer is not in the path
808 path_get_length (struct MeshPeerPath *path)
814 for (i = 0; i < path->length; i++)
816 if (path->peers[i] == myid)
818 return path->length - i;
826 * Get the cost of the path relative to the already built tunnel tree
828 * @param t The tunnel to which compare
829 * @param path The individual path to reach a peer
831 * @return Number of hops to reach destination, UINT_MAX in case the peer is not
834 * TODO: remove dummy implementation, look into the tunnel tree
837 path_get_cost (struct MeshTunnel *t, struct MeshPeerPath *path)
839 return path_get_length(path);
844 * Add the path to the peer and update the path used to reach it in case this
847 * @param peer_info Destination peer to add the path to.
848 * @param path New path to add. Last peer must be the peer in arg 1.
850 * TODO: trim the part from origin to us? Add it as path to origin?
853 path_add_to_peer (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path)
856 struct MeshPeerPath *aux;
858 if (NULL == peer_info || NULL == path)
864 l = path_get_length (path);
866 for (aux = peer_info->path_head; aux != NULL; aux = aux->next)
868 if (path_get_length (aux) > l)
870 GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head,
871 peer_info->path_tail,
876 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head,
877 peer_info->path_tail,
884 * Notify a tunnel that a connection has broken that affects at least
887 * @param t Tunnel affected
888 * @param peer Peer that (at least) has been affected by the disconnection
889 * @param p1 Peer that got disconnected from p2
890 * @param p2 Peer that got disconnected from p1
893 tunnel_notify_connection_broken(struct MeshTunnel *t,
894 struct MeshPeerInfo *peer,
900 * Remove all paths that rely on a direct connection between p1 and p2
901 * from the peer itself and notify all tunnels about it.
903 * @param pi PeerInfo of affected peer
904 * @param p1 GNUNET_PEER_Id of one peer.
905 * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and
909 path_remove_from_peer (struct MeshPeerInfo *peer,
913 struct MeshPeerPath *p;
914 struct MeshPeerPath *aux;
915 unsigned int destroyed;
923 for (i = 0; i < (p->length - 1); i++)
925 if ((p->peers[i] == p1 && p->peers[i + 1] == p2) ||
926 (p->peers[i] == p2 && p->peers[i + 1] == p1))
938 for (i = 0; i < peer->ntunnels; i++)
940 tunnel_notify_connection_broken(peer->tunnels[i], peer, p1, p2);
946 * Add the path to the origin peer and update the path used to reach it in case
947 * this is the shortest.
948 * The path is given in peer_info -> destination, therefore we turn the path
951 * @param peer_info Peer to add the path to, being the origin of the path.
952 * @param path New path to add after being inversed.
955 path_add_to_origin (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path)
960 for (i = 0; i < path->length / 2; i++)
962 aux = path->peers[i];
963 path->peers[i] = path->peers[path->length - i - 1];
964 path->peers[path->length - i - 1] = aux;
966 path_add_to_peer (peer_info, path);
970 * Integrate a stand alone path into the tunnel tree.
972 * @param t Tunnel where to add the new path.
973 * @param p Path to be integrated.
975 * @return GNUNET_OK in case of success.
976 * GNUNET_SYSERR in case of error.
978 * FIXME path: remove old path to the same peer if needed
981 path_add_to_tunnel(struct MeshTunnel *t, struct MeshPeerPath *p)
983 struct MeshTunnelPathNode *parent;
984 struct MeshTunnelPathNode *n;
985 struct GNUNET_PeerIdentity id;
986 struct GNUNET_PeerIdentity hop;
992 if (n->peer->id != p->peers[0])
995 return GNUNET_SYSERR;
997 /* Assuming that the tree is somewhat balanced, O((log n * log N).
998 * - Length of the path is expected to be log N (size of whole network).
999 * - Each level of the tree is expected to have log n children (size of tree).
1001 for (i = 1, me = -1; i < p->length; i++)
1004 if (p->peers[i] == myid)
1006 for (j = 0; j < n->nchildren; j++)
1008 if (n->children[j].peer->id == p->peers[i])
1010 n = &n->children[j];
1014 /* If we couldn't find a child equal to path[i], we have reached the end
1015 * of the common path. */
1022 return GNUNET_SYSERR;
1024 /* Add the rest of the path as a branch from parent. */
1025 while (i < p->length)
1027 parent->children = GNUNET_realloc(parent->children, parent->nchildren);
1028 parent->nchildren++;
1029 GNUNET_PEER_resolve(p->peers[i], &id);
1030 n->peer = peer_info_get(&id);
1035 /* Add info about first hop into hashmap. */
1036 if (me < p->length - 1)
1038 GNUNET_PEER_resolve(p->peers[p->length - 1], &id);
1039 GNUNET_PEER_resolve(p->peers[me + 1], &hop);
1040 GNUNET_CONTAINER_multihashmap_put(
1041 t->paths->first_hops,
1043 peer_info_get(&hop),
1044 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1051 * Build a PeerPath from the paths returned from the DHT, reversing the paths
1052 * to obtain a local peer -> destination path and interning the peer ids.
1054 * @param get_path NULL-terminated array of pointers
1055 * to the peers on reverse GET path (or NULL if not recorded)
1056 * @param put_path NULL-terminated array of pointers
1057 * to the peers on the PUT path (or NULL if not recorded)
1059 * @return Newly allocated and created path
1061 static struct MeshPeerPath *
1062 path_build_from_dht(const struct GNUNET_PeerIdentity *const *get_path,
1063 const struct GNUNET_PeerIdentity *const *put_path)
1065 struct MeshPeerPath *p;
1068 p = GNUNET_malloc (sizeof (struct MeshPeerPath));
1069 for (i = 0; get_path[i] != NULL; i++) ;
1070 for (i--; i >= 0; i--)
1073 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1074 p->peers[p->length] = GNUNET_PEER_intern (get_path[i]);
1077 for (i = 0; put_path[i] != NULL; i++) ;
1078 for (i--; i >= 0; i--)
1081 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1082 p->peers[p->length] = GNUNET_PEER_intern (put_path[i]);
1090 * Check if client has registered with the service and has not disconnected
1092 * @param client the client to check
1094 * @return non-NULL if client exists in the global DLL
1096 static struct MeshClient *
1097 client_get (struct GNUNET_SERVER_Client *client)
1099 struct MeshClient *c;
1104 if (c->handle == client)
1113 * Checks if a given client has subscribed to certain message type
1115 * @param message_type Type of message to check
1116 * @param c Client to check
1118 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
1123 client_is_subscribed (uint16_t message_type, struct MeshClient *c)
1127 GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc);
1128 return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc);
1133 * Search for a tunnel among the tunnels for a client
1135 * @param c the client whose tunnels to search in
1136 * @param tid the local id of the tunnel
1138 * @return tunnel handler, NULL if doesn't exist
1140 static struct MeshTunnel *
1141 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1143 GNUNET_HashCode hash;
1145 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1146 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1151 * Search for a tunnel by global ID using PEER_ID
1153 * @param pi owner of the tunnel
1154 * @param tid global tunnel number
1156 * @return tunnel handler, NULL if doesn't exist
1158 static struct MeshTunnel *
1159 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1161 struct MESH_TunnelID id;
1162 GNUNET_HashCode hash;
1167 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1168 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1174 * Search for a tunnel by global ID using full PeerIdentities
1176 * @param oid owner of the tunnel
1177 * @param tid global tunnel number
1179 * @return tunnel handler, NULL if doesn't exist
1181 static struct MeshTunnel *
1182 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1184 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1189 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1190 * needed rescources.
1192 * @param t Tunnel we want to add a new peer to
1193 * @param peer PeerInfo of the peer being added
1197 tunnel_add_peer(struct MeshTunnel *t, struct MeshPeerInfo *peer)
1199 struct MeshPeerPath *p;
1200 struct MeshPeerPath *best_p;
1201 unsigned int best_cost;
1204 GNUNET_array_append(peer->tunnels, peer->ntunnels, t);
1205 if (NULL == (p = peer->path_head))
1209 best_cost = UINT_MAX;
1212 if ((cost = path_get_cost(t, p)) < best_cost)
1219 path_add_to_tunnel(t, best_p);
1220 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1221 t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME,
1227 * Notify a tunnel that a connection has broken that affects at least
1228 * some of its peers.
1230 * @param t Tunnel affected
1231 * @param peer Peer that (at least) has been affected by the disconnection
1232 * @param p1 Peer that got disconnected from p2
1233 * @param p2 Peer that got disconnected from p1
1236 tunnel_notify_connection_broken(struct MeshTunnel *t,
1237 struct MeshPeerInfo *peer,
1245 * Destroy the tunnel and free any allocated resources linked to it
1247 * @param t the tunnel to destroy
1249 * @return GNUNET_OK on success
1252 tunnel_destroy (struct MeshTunnel *t)
1254 struct MeshClient *c;
1255 struct MeshQueue *q;
1256 struct MeshQueue *qn;
1257 GNUNET_HashCode hash;
1265 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1266 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
1271 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
1272 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
1276 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
1280 if (NULL != q->data)
1281 GNUNET_free (q->data);
1285 /* TODO cancel core transmit ready in case it was active */
1292 /******************************************************************************/
1293 /**************** MESH NETWORK HANDLER HELPERS ***********************/
1294 /******************************************************************************/
1298 * Function called to notify a client about the socket
1299 * being ready to queue more data. "buf" will be
1300 * NULL and "size" zero if the socket was closed for
1301 * writing in the meantime.
1303 * @param cls closure
1304 * @param size number of bytes available in buf
1305 * @param buf where the callee should write the message
1306 * @return number of bytes written to buf
1309 send_core_create_path (void *cls, size_t size, void *buf)
1311 struct MeshPathInfo *info = cls;
1312 struct GNUNET_MESH_ManipulatePath *msg;
1313 struct GNUNET_PeerIdentity *peer_ptr;
1314 struct GNUNET_PeerIdentity id;
1315 struct MeshPeerInfo *peer = info->peer;
1316 struct MeshTunnel *t = info->t;
1317 struct MeshPeerPath *p = info->path;
1322 sizeof (struct GNUNET_MESH_ManipulatePath) +
1323 p->length * sizeof (struct GNUNET_PeerIdentity);
1325 if (size < size_needed || NULL == buf)
1327 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
1328 GNUNET_PEER_resolve (path_get_first_hop (t, peer)->id, &id);
1329 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1330 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1331 size_needed, &send_core_create_path,
1336 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
1337 msg->header.size = htons (size_needed);
1338 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1339 msg->tid = ntohl(t->id.tid);
1341 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1342 for (i = 0; i < p->length; i++)
1344 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1356 * Function called to notify a client about the socket
1357 * being ready to queue more data. "buf" will be
1358 * NULL and "size" zero if the socket was closed for
1359 * writing in the meantime.
1361 * @param cls closure (MeshDataDescriptor with all info to build packet)
1362 * @param size number of bytes available in buf
1363 * @param buf where the callee should write the message
1364 * @return number of bytes written to buf
1367 send_core_data_to_origin (void *cls, size_t size, void *buf)
1369 struct MeshDataDescriptor *info = cls;
1370 struct GNUNET_MESH_ToOrigin *msg = buf;
1373 GNUNET_assert (NULL != info);
1374 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
1375 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1377 if (total_size > size)
1379 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1380 "not enough buffer to send data to origin\n");
1383 msg->header.size = htons (total_size);
1384 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1385 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1386 msg->tid = htonl (info->origin->tid);
1387 if (0 != info->size)
1389 memcpy (&msg[1], &info[1], info->size);
1391 if (NULL != info->client)
1393 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1401 * Function called to notify a client about the socket
1402 * being ready to queue more data. "buf" will be
1403 * NULL and "size" zero if the socket was closed for
1404 * writing in the meantime.
1406 * @param cls closure (data itself)
1407 * @param size number of bytes available in buf
1408 * @param buf where the callee should write the message
1409 * @return number of bytes written to buf
1412 send_core_data_unicast (void *cls, size_t size, void *buf)
1414 struct MeshDataDescriptor *info = cls;
1415 struct GNUNET_MESH_Unicast *msg = buf;
1418 GNUNET_assert (NULL != info);
1419 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1420 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1422 if (total_size > size)
1424 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1425 "not enough buffer to send data to peer\n");
1428 msg->header.size = htons (total_size);
1429 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1430 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1431 GNUNET_PEER_resolve (info->destination, &msg->destination);
1432 msg->tid = htonl (info->origin->tid);
1433 if (0 != info->size)
1435 memcpy (&msg[1], &info[1], info->size);
1437 if (NULL != info->client)
1439 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1447 * Function called to notify a client about the socket
1448 * being ready to queue more data. "buf" will be
1449 * NULL and "size" zero if the socket was closed for
1450 * writing in the meantime.
1452 * @param cls closure (data itself)
1453 * @param size number of bytes available in buf
1454 * @param buf where the callee should write the message
1455 * @return number of bytes written to buf
1458 send_core_data_multicast (void *cls, size_t size, void *buf)
1460 struct MeshDataDescriptor *info = cls;
1461 struct GNUNET_MESH_Multicast *msg = buf;
1464 GNUNET_assert (NULL != info);
1465 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1466 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1470 info->peer->core_transmit[info->handler_n] = NULL;
1472 if (total_size > size)
1474 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1475 "not enough buffer to send data futher\n");
1478 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1479 msg->header.size = htons (total_size);
1480 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1481 msg->tid = htonl (info->origin->tid);
1482 memcpy (&msg[1], &info[1], total_size);
1483 if (0 == --info->copies)
1485 if (NULL != info->client)
1487 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1496 * Function called to notify a client about the socket
1497 * being ready to queue more data. "buf" will be
1498 * NULL and "size" zero if the socket was closed for
1499 * writing in the meantime.
1501 * @param cls closure (MeshDataDescriptor)
1502 * @param size number of bytes available in buf
1503 * @param buf where the callee should write the message
1504 * @return number of bytes written to buf
1507 send_core_path_ack (void *cls, size_t size, void *buf)
1509 struct MeshDataDescriptor *info = cls;
1510 struct GNUNET_MESH_PathACK *msg = buf;
1512 GNUNET_assert (NULL != info);
1515 info->peer->core_transmit[info->handler_n] = NULL;
1517 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1522 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1523 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1524 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1525 msg->tid = htonl (info->origin->tid);
1526 msg->peer_id = my_full_id;
1528 /* TODO add signature */
1530 return sizeof (struct GNUNET_MESH_PathACK);
1535 * Function called to notify a client about the socket
1536 * being ready to queue more data. "buf" will be
1537 * NULL and "size" zero if the socket was closed for
1538 * writing in the meantime.
1540 * @param cls closure (data itself)
1541 * @param size number of bytes available in buf
1542 * @param buf where the callee should write the message
1543 * @return number of bytes written to buf
1546 send_core_data_raw (void *cls, size_t size, void *buf)
1548 struct GNUNET_MessageHeader *msg = cls;
1551 GNUNET_assert (NULL != msg);
1552 total_size = ntohs (msg->size);
1554 if (total_size > size)
1559 memcpy (buf, msg, total_size);
1567 * Send another peer a notification to destroy a tunnel
1568 * @param cls The tunnel to destroy
1569 * @param size Size in the buffer
1570 * @param buf Memory where to put the data to transmit
1571 * @return Size of data put in buffer
1574 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1576 struct MeshTunnel *t = cls;
1577 struct MeshClient *c;
1578 struct GNUNET_MESH_TunnelMessage *msg;
1582 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1583 /*FIXME*/ msg->header.size =
1584 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1585 msg->tunnel_id = htonl (t->id.tid);
1587 tunnel_destroy (c, t);
1588 return sizeof (struct GNUNET_MESH_TunnelMessage);
1594 * Send the message to all clients that have subscribed to its type
1596 * @param msg Pointer to the message itself
1597 * @return number of clients this message was sent to
1600 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1602 struct MeshClient *c;
1606 type = ntohs (msg->type);
1607 for (count = 0, c = clients; c != NULL; c = c->next)
1609 if (client_is_subscribed (type, c))
1612 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1621 * Iterator over hash map peer entries collect all neighbors who to resend the
1624 * @param cls closure (**GNUNET_PEER_Id to store hops to send packet)
1625 * @param key current key code (peer id hash)
1626 * @param value value in the hash map (peer_info)
1627 * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not.
1630 iterate_collect_neighbors (void *cls, const GNUNET_HashCode * key, void *value)
1632 struct MeshPeerInfo *peer_info = value;
1633 struct MeshPathInfo *neighbors = cls;
1636 if (peer_info->id == myid)
1640 peer_info = path_get_first_hop (neighbors->t, peer_info);
1641 for (i = 0; i < neighbors->path->length; i++)
1643 if (neighbors->path->peers[i] == peer_info->id)
1646 GNUNET_array_append(neighbors->path->peers,
1647 neighbors->path->length,
1654 /******************************************************************************/
1655 /******************** MESH NETWORK HANDLERS **************************/
1656 /******************************************************************************/
1660 * Core handler for path creation
1661 * struct GNUNET_CORE_MessageHandler
1663 * @param cls closure
1664 * @param message message
1665 * @param peer peer identity this notification is about
1666 * @param atsi performance data
1667 * @return GNUNET_OK to keep the connection open,
1668 * GNUNET_SYSERR to close it (signal serious error)
1672 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1673 const struct GNUNET_MessageHeader *message,
1674 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1676 unsigned int own_pos;
1679 MESH_TunnelNumber tid;
1680 struct GNUNET_MESH_ManipulatePath *msg;
1681 struct GNUNET_PeerIdentity *pi;
1682 struct GNUNET_PeerIdentity id;
1683 GNUNET_HashCode hash;
1684 struct MeshPeerPath *path;
1685 struct MeshPeerInfo *dest_peer_info;
1686 struct MeshPeerInfo *orig_peer_info;
1687 struct MeshTunnel *t;
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "MESH: Received a MESH path create msg\n");
1691 size = ntohs (message->size);
1692 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1694 GNUNET_break_op (0);
1698 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1699 if (size % sizeof (struct GNUNET_PeerIdentity))
1701 GNUNET_break_op (0);
1704 size /= sizeof (struct GNUNET_PeerIdentity);
1707 GNUNET_break_op (0);
1710 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1712 tid = ntohl (msg->tid);
1713 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1714 t = tunnel_get (pi, tid);
1718 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1719 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1720 t->id.oid = GNUNET_PEER_intern (pi);
1722 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1724 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1726 GNUNET_CONTAINER_multihashmap_put (
1728 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1736 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1737 if (NULL == dest_peer_info)
1739 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1740 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1741 GNUNET_CONTAINER_multihashmap_put (
1743 &pi[size - 1].hashPubKey,
1745 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1747 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1748 if (NULL == orig_peer_info)
1750 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1751 orig_peer_info->id = GNUNET_PEER_intern (pi);
1752 GNUNET_CONTAINER_multihashmap_put (
1756 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1759 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
1760 path->length = size;
1761 path->peers = GNUNET_malloc (size * sizeof (GNUNET_PEER_Id));
1763 for (i = 0; i < size; i++)
1765 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1766 if (path->peers[i] == myid)
1770 { /* cannot be self, must be 'not found' */
1771 /* create path: self not found in path through self */
1772 GNUNET_break_op (0);
1773 path_destroy (path);
1774 /* FIXME error. destroy tunnel? leave for timeout? */
1777 if (own_pos == size - 1)
1779 /* It is for us! Send ack. */
1780 struct MeshDataDescriptor *info;
1783 path_add_to_origin (orig_peer_info, path); /* inverts path! */
1784 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1785 info->origin = &t->id;
1786 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1787 GNUNET_assert (info->peer);
1788 for (j = 0; info->peer->core_transmit[j]; j++)
1796 info->handler_n = j;
1797 info->peer->core_transmit[j] =
1798 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1799 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1800 sizeof (struct GNUNET_MessageHeader),
1801 &send_core_path_ack, info);
1805 /* It's for somebody else! Retransmit. */
1806 struct MeshPathInfo *path_info;
1808 path_info = GNUNET_malloc (sizeof(struct MeshPathInfo));
1810 path_info->path = path;
1811 path_info->peer = dest_peer_info;
1813 path_add_to_peer (dest_peer_info, path);
1814 GNUNET_PEER_resolve (path->peers[own_pos + 1], &id);
1815 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1816 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1817 sizeof (struct GNUNET_MessageHeader),
1818 &send_core_create_path,
1826 * Core handler for mesh network traffic going from the origin to a peer
1828 * @param cls closure
1829 * @param peer peer identity this notification is about
1830 * @param message message
1831 * @param atsi performance data
1832 * @return GNUNET_OK to keep the connection open,
1833 * GNUNET_SYSERR to close it (signal serious error)
1836 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1837 const struct GNUNET_MessageHeader *message,
1838 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1840 struct GNUNET_MESH_Unicast *msg;
1841 struct GNUNET_PeerIdentity id;
1842 struct MeshTunnel *t;
1843 struct MeshPeerInfo *pi;
1846 size = ntohs (message->size);
1848 sizeof (struct GNUNET_MESH_Unicast) +
1849 sizeof (struct GNUNET_MessageHeader))
1854 msg = (struct GNUNET_MESH_Unicast *) message;
1855 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1858 /* TODO notify back: we don't know this tunnel */
1861 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1862 &msg->destination.hashPubKey);
1865 /* TODO maybe feedback, log to statistics */
1870 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1873 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &id);
1874 msg = GNUNET_malloc (size);
1875 memcpy (msg, message, size);
1876 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1877 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1878 &send_core_data_raw, msg);
1884 * Core handler for mesh network traffic going from the origin to all peers
1886 * @param cls closure
1887 * @param message message
1888 * @param peer peer identity this notification is about
1889 * @param atsi performance data
1890 * @return GNUNET_OK to keep the connection open,
1891 * GNUNET_SYSERR to close it (signal serious error)
1894 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1895 const struct GNUNET_MessageHeader *message,
1896 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1898 struct GNUNET_MESH_Multicast *msg;
1899 struct GNUNET_PeerIdentity id;
1900 struct MeshDataDescriptor *info;
1901 struct MeshPathInfo neighbors;
1902 struct MeshTunnel *t;
1908 size = ntohs (message->size);
1910 sizeof (struct GNUNET_MESH_Multicast) +
1911 sizeof (struct GNUNET_MessageHeader))
1913 GNUNET_break_op (0);
1916 msg = (struct GNUNET_MESH_Multicast *) message;
1917 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1921 /* TODO notify that we dont know that tunnel */
1925 /* Transmit to locally interested clients */
1926 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
1928 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1931 /* Retransmit to other peers.
1932 * Using path here as just a collection of peers, not a path per se.
1935 neighbors.path = GNUNET_malloc (sizeof(struct MeshPeerPath));
1936 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
1938 if (0 == neighbors.path->length)
1940 GNUNET_free(neighbors.path);
1943 size -= sizeof (struct GNUNET_MESH_Multicast);
1944 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
1945 info->origin = &t->id;
1946 info->copies = neighbors.path->length;
1947 for (i = 0; i < info->copies; i++)
1949 GNUNET_PEER_resolve (neighbors.path->peers[i], &id);
1950 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1951 GNUNET_assert (NULL != info->peer);
1952 for (j = 0; 0 != info->peer->core_transmit[j]; j++)
1954 if (j == (CORE_QUEUE_SIZE - 1))
1960 info->handler_n = j;
1961 info->peer->infos[j] = info;
1962 info->peer->core_transmit[j] =
1963 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1964 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1965 ntohs (msg->header.size),
1966 &send_core_data_multicast, info);
1968 GNUNET_free(neighbors.path->peers);
1969 GNUNET_free(neighbors.path);
1975 * Core handler for mesh network traffic
1977 * @param cls closure
1978 * @param message message
1979 * @param peer peer identity this notification is about
1980 * @param atsi performance data
1981 * @return GNUNET_OK to keep the connection open,
1982 * GNUNET_SYSERR to close it (signal serious error)
1987 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
1988 const struct GNUNET_MessageHeader *message,
1989 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1991 struct GNUNET_MESH_ToOrigin *msg;
1992 struct GNUNET_PeerIdentity id;
1993 struct MeshTunnel *t;
1994 struct MeshPeerInfo *peer_info;
1997 size = ntohs (message->size);
1999 sizeof (struct GNUNET_MESH_ToOrigin) +
2000 sizeof (struct GNUNET_MessageHeader))
2002 GNUNET_break_op (0);
2005 msg = (struct GNUNET_MESH_ToOrigin *) message;
2006 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2010 /* TODO notify that we dont know this tunnel (whom)? */
2014 if (t->id.oid == myid)
2016 if (NULL == t->client)
2018 /* got data packet for ownerless tunnel */
2019 GNUNET_break_op (0);
2022 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
2026 peer_info = peer_info_get (&msg->oid);
2027 if (NULL == peer_info)
2029 /* unknown origin of tunnel */
2033 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2034 msg = GNUNET_malloc (size);
2035 memcpy (msg, message, size);
2036 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2037 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
2038 &send_core_data_raw, msg);
2045 * Core handler for path ACKs
2047 * @param cls closure
2048 * @param message message
2049 * @param peer peer identity this notification is about
2050 * @param atsi performance data
2052 * @return GNUNET_OK to keep the connection open,
2053 * GNUNET_SYSERR to close it (signal serious error)
2055 * FIXME path change state
2058 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2059 const struct GNUNET_MessageHeader *message,
2060 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2062 struct GNUNET_MESH_PathACK *msg;
2063 struct GNUNET_PeerIdentity id;
2064 struct MeshTunnel *t;
2065 struct MeshPeerInfo *peer_info;
2067 msg = (struct GNUNET_MESH_PathACK *) message;
2068 t = tunnel_get (&msg->oid, msg->tid);
2071 /* TODO notify that we don't know the tunnel */
2075 /* Message for us? */
2076 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
2078 struct GNUNET_MESH_PeerControl pc;
2080 if (NULL == t->client)
2085 peer_info = peer_info_get (&msg->peer_id);
2086 if (NULL == peer_info)
2088 GNUNET_break_op (0);
2091 /* FIXME change state of peer */
2092 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2093 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2094 pc.tunnel_id = htonl (t->local_tid);
2095 GNUNET_PEER_resolve (peer_info->id, &pc.peer);
2096 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2097 &pc.header, GNUNET_NO);
2101 peer_info = peer_info_get (&msg->oid);
2102 if (NULL == peer_info)
2104 /* If we know the tunnel, we should DEFINITELY know the peer */
2108 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2109 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
2110 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
2111 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2112 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2113 sizeof (struct GNUNET_MESH_PathACK),
2114 &send_core_data_raw, msg);
2120 * Functions to handle messages from core
2122 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2123 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
2124 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2125 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2126 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2127 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
2128 sizeof (struct GNUNET_MESH_PathACK)},
2134 /******************************************************************************/
2135 /**************** MESH LOCAL HANDLER HELPERS ***********************/
2136 /******************************************************************************/
2139 * delete_tunnel_entry: iterator for deleting each tunnel that belongs to a
2140 * client when the client disconnects.
2141 * @param cls closure (client that is disconnecting)
2142 * @param key the hash of the local tunnel id (used to access the hashmap)
2143 * @param value the value stored at the key (tunnel to destroy)
2144 * @return GNUNET_OK on success
2147 delete_tunnel_entry (void *cls, const GNUNET_HashCode * key, void *value)
2151 r = tunnel_destroy ((struct MeshTunnel *) value);
2157 * deregister_app: iterator for removing each application registered by a client
2158 * @param cls closure
2159 * @param key the hash of the application id (used to access the hashmap)
2160 * @param value the value stored at the key (client)
2161 * @return GNUNET_OK on success
2164 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
2166 GNUNET_CONTAINER_multihashmap_remove (applications, key, value);
2172 * notify_client_connection_failure: notify a client that the connection to the
2173 * requested remote peer is not possible (for instance, no route found)
2174 * Function called when the socket is ready to queue more data. "buf" will be
2175 * NULL and "size" zero if the socket was closed for writing in the meantime.
2177 * @param cls closure
2178 * @param size number of bytes available in buf
2179 * @param buf where the callee should write the message
2180 * @return number of bytes written to buf
2183 notify_client_connection_failure (void *cls, size_t size, void *buf)
2186 struct MeshPeerInfo *peer_info;
2187 struct GNUNET_MESH_PeerControl *msg;
2188 struct GNUNET_PeerIdentity id;
2190 if (0 == size && NULL == buf)
2192 // TODO retry? cancel?
2196 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
2197 peer_info = (struct MeshPeerInfo *) cls;
2198 msg = (struct GNUNET_MESH_PeerControl *) buf;
2199 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2200 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
2201 // msg->tunnel_id = htonl(peer_info->t->tid);
2202 GNUNET_PEER_resolve (peer_info->id, &id);
2203 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
2211 * Function to process paths received for a new peer addition. The recorded
2212 * paths form the initial tunnel, which can be optimized later.
2213 * Called on each result obtained for the DHT search.
2215 * @param cls closure
2216 * @param exp when will this value expire
2217 * @param key key of the result
2218 * @param get_path NULL-terminated array of pointers
2219 * to the peers on reverse GET path (or NULL if not recorded)
2220 * @param put_path NULL-terminated array of pointers
2221 * to the peers on the PUT path (or NULL if not recorded)
2222 * @param type type of the result
2223 * @param size number of bytes in data
2224 * @param data pointer to the result data
2229 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2230 const GNUNET_HashCode * key,
2231 const struct GNUNET_PeerIdentity *const *get_path,
2232 const struct GNUNET_PeerIdentity *const *put_path,
2233 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
2235 struct MeshPathInfo *path_info = cls;
2236 struct MeshPeerPath *p;
2237 struct GNUNET_PeerIdentity pi;
2240 if (NULL == get_path || NULL == put_path)
2242 if (NULL == path_info->peer->path_head)
2244 // Find ourselves some alternate initial path to the destination: retry
2245 GNUNET_DHT_get_stop (path_info->peer->dhtget);
2246 GNUNET_PEER_resolve (path_info->peer->id, &pi);
2247 path_info->peer->dhtget = GNUNET_DHT_get_start (
2248 dht_handle, /* handle */
2249 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2250 GNUNET_BLOCK_TYPE_TEST, /* type */
2251 &pi.hashPubKey, /*key to search */
2252 4, /* replication level */
2253 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2256 0, /* xquery bits */
2258 (void *) path_info);
2263 p = path_build_from_dht(get_path, put_path);
2264 path_add_to_peer (path_info->peer, p);
2265 for (i = 0; i < path_info->peer->ntunnels; i++)
2267 tunnel_add_peer(path_info->peer->tunnels[i], path_info->peer);
2269 GNUNET_free(path_info);
2276 * Function to process paths received for a new peer addition. The recorded
2277 * paths form the initial tunnel, which can be optimized later.
2278 * Called on each result obtained for the DHT search.
2280 * @param cls closure
2281 * @param exp when will this value expire
2282 * @param key key of the result
2283 * @param get_path NULL-terminated array of pointers
2284 * to the peers on reverse GET path (or NULL if not recorded)
2285 * @param put_path NULL-terminated array of pointers
2286 * to the peers on the PUT path (or NULL if not recorded)
2287 * @param type type of the result
2288 * @param size number of bytes in data
2289 * @param data pointer to the result data
2292 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2293 const GNUNET_HashCode * key,
2294 const struct GNUNET_PeerIdentity *const *get_path,
2295 const struct GNUNET_PeerIdentity *const *put_path,
2296 enum GNUNET_BLOCK_Type type, size_t size,
2299 const struct GNUNET_PeerIdentity *pi = data;
2300 struct GNUNET_PeerIdentity id;
2301 struct MeshTunnel *t = cls;
2302 struct MeshPeerInfo *peer_info;
2303 struct MeshPeerPath *p;
2306 if (size != sizeof (struct GNUNET_PeerIdentity))
2308 GNUNET_break_op (0);
2311 GNUNET_assert (NULL != t->client);
2312 GNUNET_DHT_get_stop (t->client->dht_get_type);
2313 t->client->dht_get_type = NULL;
2314 peer_info = peer_info_get (pi);
2315 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
2316 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2318 if ((NULL == get_path || NULL == put_path) &&
2319 NULL == peer_info->path_head &&
2320 NULL == peer_info->dhtget)
2322 /* we don't have a route to the peer, let's try a direct lookup */
2323 peer_info->dhtget = GNUNET_DHT_get_start (
2324 dht_handle, /* handle */
2325 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2326 GNUNET_BLOCK_TYPE_TEST, /* block type */
2327 &pi->hashPubKey, /* key to look up */
2328 10U, /* replication level */
2329 GNUNET_DHT_RO_RECORD_ROUTE, /* option to dht: record route */
2330 NULL, /* bloom filter */
2333 0, /* xquery bits */
2334 dht_get_id_handler, /* callback */
2335 peer_info); /* closure */
2338 p = path_build_from_dht(get_path, put_path);
2339 path_add_to_peer (peer_info, p);
2341 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2342 "MESH: new route for tunnel 0x%x found, has %u hops\n",
2345 for (i = 0; i < p->length; i++)
2347 GNUNET_PEER_resolve(p->peers[0], &id);
2348 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2351 GNUNET_h2s_full(&id.hashPubKey));
2355 GNUNET_PEER_resolve (p->peers[1], &id);
2356 GNUNET_CORE_notify_transmit_ready (
2357 core_handle, /* handle */
2360 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2362 sizeof (struct GNUNET_MESH_ManipulatePath) +
2363 (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
2364 &send_core_create_path, /* callback */
2365 peer_info); /* cls */
2368 /******************************************************************************/
2369 /********************* MESH LOCAL HANDLES **************************/
2370 /******************************************************************************/
2374 * Handler for client disconnection
2376 * @param cls closure
2377 * @param client identification of the client; NULL
2378 * for the last call when the server is destroyed
2381 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2383 struct MeshClient *c;
2384 struct MeshClient *next;
2386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2390 if (c->handle != client)
2392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2396 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
2397 if (NULL != c->tunnels)
2399 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels, &delete_tunnel_entry,
2401 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2404 /* deregister clients applications */
2405 if (NULL != c->apps)
2407 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
2408 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
2410 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
2411 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
2413 GNUNET_SCHEDULER_cancel (announce_applications_task);
2414 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
2416 if (NULL != c->types)
2417 GNUNET_CONTAINER_multihashmap_destroy (c->types);
2418 if (NULL != c->dht_get_type)
2419 GNUNET_DHT_get_stop (c->dht_get_type);
2420 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2426 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2432 * Handler for new clients
2434 * @param cls closure
2435 * @param client identification of the client
2436 * @param message the actual message, which includes messages the client wants
2439 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2440 const struct GNUNET_MessageHeader *message)
2442 struct GNUNET_MESH_ClientConnect *cc_msg;
2443 struct MeshClient *c;
2444 GNUNET_MESH_ApplicationType *a;
2451 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2452 /* Check data sanity */
2453 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2454 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2455 ntypes = ntohs (cc_msg->types);
2456 napps = ntohs (cc_msg->applications);
2458 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
2461 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2465 /* Create new client structure */
2466 c = GNUNET_malloc (sizeof (struct MeshClient));
2468 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
2471 GNUNET_MESH_ApplicationType at;
2474 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
2475 for (i = 0; i < napps; i++)
2478 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
2479 /* store in clients hashmap */
2480 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
2481 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2482 /* store in global hashmap, for announcements */
2483 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
2484 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2486 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2487 announce_applications_task =
2488 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
2496 t = (uint16_t *) & a[napps];
2497 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
2498 for (i = 0; i < ntypes; i++)
2501 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
2503 /* store in clients hashmap */
2504 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
2505 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2506 /* store in global hashmap */
2507 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
2508 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2512 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
2514 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2515 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2516 GNUNET_SERVER_notification_context_add (nc, client);
2518 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2524 * Handler for requests of new tunnels
2526 * @param cls closure
2527 * @param client identification of the client
2528 * @param message the actual message
2531 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2532 const struct GNUNET_MessageHeader *message)
2534 struct GNUNET_MESH_TunnelMessage *t_msg;
2535 struct MeshTunnel *t;
2536 struct MeshClient *c;
2537 GNUNET_HashCode hash;
2539 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2541 /* Sanity check for client registration */
2542 if (NULL == (c = client_get (client)))
2545 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2549 /* Message sanity check */
2550 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2553 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2557 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2558 /* Sanity check for tunnel numbering */
2559 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2562 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2565 /* Sanity check for duplicate tunnel IDs */
2566 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
2569 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2573 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2574 while (NULL != tunnel_get_by_pi (myid, next_tid))
2575 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2576 t->id.tid = next_tid++;
2578 t->local_tid = ntohl (t_msg->tunnel_id);
2580 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2582 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2584 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2585 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2588 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2592 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2594 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2595 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2598 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2602 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2608 * Handler for requests of deleting tunnels
2610 * @param cls closure
2611 * @param client identification of the client
2612 * @param message the actual message
2615 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2616 const struct GNUNET_MessageHeader *message)
2618 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2619 struct MeshClient *c;
2620 struct MeshTunnel *t;
2621 MESH_TunnelNumber tid;
2622 GNUNET_HashCode hash;
2624 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2626 /* Sanity check for client registration */
2627 if (NULL == (c = client_get (client)))
2630 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2633 /* Message sanity check */
2634 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2637 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2641 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2643 /* Retrieve tunnel */
2644 tid = ntohl (tunnel_msg->tunnel_id);
2646 /* Remove from local id hashmap */
2647 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2648 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2649 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2651 /* Remove from global id hashmap */
2652 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2653 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2655 // notify_tunnel_destroy(t);
2656 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2662 * Handler for connection requests to new peers
2664 * @param cls closure
2665 * @param client identification of the client
2666 * @param message the actual message (PeerControl)
2671 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2672 const struct GNUNET_MessageHeader *message)
2674 struct GNUNET_MESH_PeerControl *peer_msg;
2675 struct MeshClient *c;
2676 struct MeshTunnel *t;
2677 MESH_TunnelNumber tid;
2678 struct MeshPeerInfo *peer_info;
2681 /* Sanity check for client registration */
2682 if (NULL == (c = client_get (client)))
2685 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2689 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2690 /* Sanity check for message size */
2691 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2694 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2698 /* Tunnel exists? */
2699 tid = ntohl (peer_msg->tunnel_id);
2700 t = tunnel_get_by_local_id (c, tid);
2704 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2708 /* Does client own tunnel? */
2709 if (t->client->handle != client)
2712 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2717 peer_info = peer_info_get (&peer_msg->peer);
2719 /* Start DHT search if needed FIXME: if not already connected */
2720 if (NULL == peer_info->dhtget)
2722 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_TEST, &peer_msg->peer.hashPubKey, 4, /* replication level */
2723 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2726 0, /* xquery bits */
2728 (void *) peer_info);
2731 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2737 * Handler for disconnection requests of peers in a tunnel
2739 * @param cls closure
2740 * @param client identification of the client
2741 * @param message the actual message (PeerControl)
2744 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2745 const struct GNUNET_MessageHeader *message)
2747 struct GNUNET_MESH_PeerControl *peer_msg;
2748 struct MeshClient *c;
2749 struct MeshTunnel *t;
2750 MESH_TunnelNumber tid;
2752 /* Sanity check for client registration */
2753 if (NULL == (c = client_get (client)))
2756 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2759 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2760 /* Sanity check for message size */
2761 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2764 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2768 /* Tunnel exists? */
2769 tid = ntohl (peer_msg->tunnel_id);
2770 t = tunnel_get_by_local_id (c, tid);
2774 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2778 /* Does client own tunnel? */
2779 if (t->client->handle != client)
2782 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2786 /* Ok, delete peer from tunnel */
2787 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2788 &peer_msg->peer.hashPubKey);
2790 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2796 * Handler for connection requests to new peers by type
2798 * @param cls closure
2799 * @param client identification of the client
2800 * @param message the actual message (ConnectPeerByType)
2803 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2804 const struct GNUNET_MessageHeader *message)
2806 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2807 struct MeshClient *c;
2808 struct MeshTunnel *t;
2809 GNUNET_HashCode hash;
2810 GNUNET_MESH_ApplicationType type;
2811 MESH_TunnelNumber tid;
2813 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
2814 /* Sanity check for client registration */
2815 if (NULL == (c = client_get (client)))
2818 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2822 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2823 /* Sanity check for message size */
2824 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
2825 ntohs (connect_msg->header.size))
2828 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2832 /* Tunnel exists? */
2833 tid = ntohl (connect_msg->tunnel_id);
2834 t = tunnel_get_by_local_id (c, tid);
2838 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2842 /* Does client own tunnel? */
2843 if (t->client->handle != client)
2846 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2850 /* Do WE have the service? */
2851 type = ntohl (connect_msg->type);
2852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type);
2853 GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash);
2854 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
2857 /* Yes! Fast forward, add ourselves to the tunnel and send the
2858 * good news to the client
2860 struct GNUNET_MESH_PeerControl pc;
2862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
2863 pc.peer = my_full_id;
2864 GNUNET_CONTAINER_multihashmap_put (t->peers, &pc.peer.hashPubKey,
2865 peer_info_get (&pc.peer),
2866 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2867 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2868 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2869 pc.tunnel_id = htonl (t->local_tid);
2870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
2871 GNUNET_SERVER_notification_context_unicast (nc, /* context */
2873 &pc.header, /* msg */
2874 GNUNET_NO); /* can drop? */
2875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
2876 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2879 /* Ok, lets find a peer offering the service */
2880 if (c->dht_get_type)
2882 GNUNET_DHT_get_stop (c->dht_get_type);
2884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
2885 GNUNET_h2s_full (&hash));
2887 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
2888 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
2889 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
2890 &dht_get_type_handler, t);
2892 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2898 * Handler for client traffic directed to one peer
2900 * @param cls closure
2901 * @param client identification of the client
2902 * @param message the actual message
2905 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
2906 const struct GNUNET_MessageHeader *message)
2908 struct MeshClient *c;
2909 struct MeshTunnel *t;
2910 struct MeshPeerInfo *pi;
2911 struct GNUNET_MESH_Unicast *data_msg;
2912 struct GNUNET_PeerIdentity next_hop;
2913 struct MeshDataDescriptor *info;
2914 MESH_TunnelNumber tid;
2917 /* Sanity check for client registration */
2918 if (NULL == (c = client_get (client)))
2921 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2924 data_msg = (struct GNUNET_MESH_Unicast *) message;
2925 /* Sanity check for message size */
2926 if (sizeof (struct GNUNET_MESH_Unicast) +
2927 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
2930 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2934 /* Tunnel exists? */
2935 tid = ntohl (data_msg->tid);
2936 t = tunnel_get_by_local_id (c, tid);
2940 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2944 /* Is it a local tunnel? Then, does client own the tunnel? */
2945 if (t->client->handle != NULL && t->client->handle != client)
2948 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2952 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
2953 &data_msg->destination.hashPubKey);
2954 /* Is the selected peer in the tunnel? */
2958 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2963 struct GNUNET_MESH_Unicast copy;
2965 /* Work around const limitation */
2966 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
2967 copy.oid = my_full_id;
2968 copy.tid = htonl (t->id.tid);
2969 handle_mesh_data_unicast (NULL, &my_full_id, ©.header, NULL);
2972 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &next_hop);
2973 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
2974 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
2975 memcpy (&info[1], &data_msg[1], data_size);
2976 info->destination = pi->id;
2977 info->origin = &t->id;
2978 info->size = data_size;
2979 info->client = client;
2980 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2981 GNUNET_TIME_UNIT_FOREVER_REL, &next_hop,
2982 /* FIXME re-check types */
2984 sizeof (struct GNUNET_MESH_Unicast),
2985 &send_core_data_unicast, info);
2990 * Handler for client traffic directed to all peers in a tunnel
2992 * @param cls closure
2993 * @param client identification of the client
2994 * @param message the actual message
2997 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
2998 const struct GNUNET_MessageHeader *message)
3000 struct MeshClient *c;
3001 struct MeshTunnel *t;
3002 struct GNUNET_MESH_Multicast *data_msg;
3003 MESH_TunnelNumber tid;
3005 /* Sanity check for client registration */
3006 if (NULL == (c = client_get (client)))
3009 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3012 data_msg = (struct GNUNET_MESH_Multicast *) message;
3013 /* Sanity check for message size */
3014 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
3017 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3021 /* Tunnel exists? */
3022 tid = ntohl (data_msg->tid);
3023 t = tunnel_get_by_local_id (c, tid);
3027 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3031 /* Does client own tunnel? */
3032 if (t->client->handle != client)
3035 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3041 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3046 * Functions to handle messages from clients
3048 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
3049 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
3050 {&handle_local_tunnel_create, NULL,
3051 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
3052 sizeof (struct GNUNET_MESH_TunnelMessage)},
3053 {&handle_local_tunnel_destroy, NULL,
3054 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
3055 sizeof (struct GNUNET_MESH_TunnelMessage)},
3056 {&handle_local_connect_add, NULL,
3057 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
3058 sizeof (struct GNUNET_MESH_PeerControl)},
3059 {&handle_local_connect_del, NULL,
3060 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
3061 sizeof (struct GNUNET_MESH_PeerControl)},
3062 {&handle_local_connect_by_type, NULL,
3063 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
3064 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
3065 {&handle_local_unicast, NULL,
3066 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3067 {&handle_local_unicast, NULL,
3068 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3069 {&handle_local_multicast, NULL,
3070 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3076 * To be called on core init/fail.
3078 * @param cls service closure
3079 * @param server handle to the server for this service
3080 * @param identity the public identity of this peer
3081 * @param publicKey the public key of this peer
3084 core_init (void *cls, struct GNUNET_CORE_Handle *server,
3085 const struct GNUNET_PeerIdentity *identity,
3086 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
3088 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
3089 core_handle = server;
3090 my_full_id = *identity;
3091 myid = GNUNET_PEER_intern (identity);
3092 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
3097 * Method called whenever a given peer connects.
3099 * @param cls closure
3100 * @param peer peer identity this notification is about
3101 * @param atsi performance data for the connection
3104 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
3105 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
3107 // GNUNET_PEER_Id pid;
3108 struct MeshPeerInfo *peer_info;
3109 struct MeshPeerPath *path;
3111 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
3112 peer_info = peer_info_get (peer);
3113 if (myid == peer_info->id)
3115 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3117 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
3119 path->peers = GNUNET_malloc (sizeof (GNUNET_PEER_Id) * 2);
3120 path->peers[0] = myid;
3121 path->peers[1] = peer_info->id;
3122 path_add_to_peer (peer_info, path);
3127 * Method called whenever a peer disconnects.
3129 * @param cls closure
3130 * @param peer peer identity this notification is about
3133 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
3135 struct MeshPeerInfo *pi;
3138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
3139 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
3145 for (i = 0; i < CORE_QUEUE_SIZE; i++)
3147 if (pi->core_transmit[i])
3149 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
3150 /* TODO: notify that tranmission has failed */
3151 GNUNET_free (pi->infos[i]);
3154 path_remove_from_peer (pi, pi->id, myid);
3157 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3163 /******************************************************************************/
3164 /************************ MAIN FUNCTIONS ****************************/
3165 /******************************************************************************/
3168 * Task run during shutdown.
3174 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3176 struct MeshClient *c;
3178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
3179 if (core_handle != NULL)
3181 GNUNET_CORE_disconnect (core_handle);
3184 if (dht_handle != NULL)
3186 for (c = clients; NULL != c; c = c->next)
3187 if (NULL != c->dht_get_type)
3188 GNUNET_DHT_get_stop (c->dht_get_type);
3189 GNUNET_DHT_disconnect (dht_handle);
3194 GNUNET_SERVER_notification_context_destroy (nc);
3197 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
3199 GNUNET_SCHEDULER_cancel (announce_id_task);
3200 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
3202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
3206 * Process mesh requests.
3208 * @param cls closure
3209 * @param server the initialized server
3210 * @param c configuration to use
3213 run (void *cls, struct GNUNET_SERVER_Handle *server,
3214 const struct GNUNET_CONFIGURATION_Handle *c)
3216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
3217 GNUNET_SERVER_add_handlers (server, client_handlers);
3218 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3219 server_handle = server;
3220 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
3221 CORE_QUEUE_SIZE, /* queue size */
3222 NULL, /* Closure passed to MESH functions */
3223 &core_init, /* Call core_init once connected */
3224 &core_connect, /* Handle connects */
3225 &core_disconnect, /* remove peers on disconnects */
3226 NULL, /* Do we care about "status" updates? */
3227 NULL, /* Don't notify about all incoming messages */
3228 GNUNET_NO, /* For header only in notification */
3229 NULL, /* Don't notify about all outbound messages */
3230 GNUNET_NO, /* For header-only out notification */
3231 core_handlers); /* Register these handlers */
3232 if (core_handle == NULL)
3236 dht_handle = GNUNET_DHT_connect (c, 64);
3237 if (dht_handle == NULL)
3239 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
3240 Running without DHT has a severe\
3241 impact in MESH capabilities.\n\
3242 Plase check your configuretion and enable DHT.\n");
3248 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3249 peers = GNUNET_CONTAINER_multihashmap_create (32);
3250 applications = GNUNET_CONTAINER_multihashmap_create (32);
3251 types = GNUNET_CONTAINER_multihashmap_create (32);
3252 nc = GNUNET_SERVER_notification_context_create (server_handle,
3255 clients_tail = NULL;
3257 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3259 /* Scheduled the task to clean up when shutdown is called */
3260 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
3263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
3267 * The main function for the mesh service.
3269 * @param argc number of arguments from the command line
3270 * @param argv command line arguments
3271 * @return 0 ok, 1 on error
3274 main (int argc, char *const *argv)
3278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
3281 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
3283 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");