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
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file 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);
971 * Build a PeerPath from the paths returned from the DHT, reversing the paths
972 * to obtain a local peer -> destination path and interning the peer ids.
974 * @param get_path NULL-terminated array of pointers
975 * to the peers on reverse GET path (or NULL if not recorded)
976 * @param put_path NULL-terminated array of pointers
977 * to the peers on the PUT path (or NULL if not recorded)
979 * @return Newly allocated and created path
981 static struct MeshPeerPath *
982 path_build_from_dht(const struct GNUNET_PeerIdentity *const *get_path,
983 const struct GNUNET_PeerIdentity *const *put_path)
985 struct MeshPeerPath *p;
988 p = GNUNET_malloc (sizeof (struct MeshPeerPath));
989 for (i = 0; get_path[i] != NULL; i++) ;
990 for (i--; i >= 0; i--)
993 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
994 p->peers[p->length] = GNUNET_PEER_intern (get_path[i]);
997 for (i = 0; put_path[i] != NULL; i++) ;
998 for (i--; i >= 0; i--)
1001 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1002 p->peers[p->length] = GNUNET_PEER_intern (put_path[i]);
1010 * Check if client has registered with the service and has not disconnected
1012 * @param client the client to check
1014 * @return non-NULL if client exists in the global DLL
1016 static struct MeshClient *
1017 client_get (struct GNUNET_SERVER_Client *client)
1019 struct MeshClient *c;
1024 if (c->handle == client)
1033 * Checks if a given client has subscribed to certain message type
1035 * @param message_type Type of message to check
1036 * @param c Client to check
1038 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
1043 client_is_subscribed (uint16_t message_type, struct MeshClient *c)
1047 GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc);
1048 return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc);
1053 * Search for a tunnel among the tunnels for a client
1055 * @param c the client whose tunnels to search in
1056 * @param tid the local id of the tunnel
1058 * @return tunnel handler, NULL if doesn't exist
1060 static struct MeshTunnel *
1061 tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
1063 GNUNET_HashCode hash;
1065 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
1066 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
1071 * Search for a tunnel by global ID using PEER_ID
1073 * @param pi owner of the tunnel
1074 * @param tid global tunnel number
1076 * @return tunnel handler, NULL if doesn't exist
1078 static struct MeshTunnel *
1079 tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
1081 struct MESH_TunnelID id;
1082 GNUNET_HashCode hash;
1087 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
1088 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
1094 * Search for a tunnel by global ID using full PeerIdentities
1096 * @param oid owner of the tunnel
1097 * @param tid global tunnel number
1099 * @return tunnel handler, NULL if doesn't exist
1101 static struct MeshTunnel *
1102 tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
1104 return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid);
1109 * Recursively find the given peer in the tree.
1111 * @param t Tunnel where to add the new path.
1112 * @param p Path to look for.
1114 * @return Pointer to the node of the peer. NULL if not found.
1116 static struct MeshTunnelPathNode *
1117 tunnel_find_peer(struct MeshTunnelPathNode *root, struct MeshPeerInfo *peer)
1119 struct MeshTunnelPathNode *n;
1122 if (root->peer == peer)
1124 for (i = 0; i < root->nchildren; i++)
1126 n = tunnel_find_peer(n, peer);
1135 * Delete the current path to the peer, including all now unused relays.
1137 * @param t Tunnel where to add the new path.
1138 * @param p Path to be integrated.
1140 * @return GNUNET_OK in case of success.
1141 * GNUNET_SYSERR in case of error.
1143 * TODO: notify peers of deletion
1146 tunnel_del_path(struct MeshTunnel *t, struct MeshPeerInfo *peer)
1148 struct MeshTunnelPathNode *parent;
1149 struct MeshTunnelPathNode *n;
1151 n = tunnel_find_peer(t->paths->me, peer);
1153 return GNUNET_SYSERR;
1156 while (NULL != parent &&
1157 MESH_PEER_RELAY == parent->status &&
1158 1 == parent->nchildren)
1161 GNUNET_free(parent->children);
1162 parent = parent->parent;
1165 return GNUNET_SYSERR;
1166 *n = parent->children[parent->nchildren - 1];
1167 parent->nchildren--;
1168 parent->children = GNUNET_realloc (parent->children, parent->nchildren);
1174 * Integrate a stand alone path into the tunnel tree.
1176 * @param t Tunnel where to add the new path.
1177 * @param p Path to be integrated.
1179 * @return GNUNET_OK in case of success.
1180 * GNUNET_SYSERR in case of error.
1183 * - go backwards on path looking for each peer in the present tree
1186 tunnel_add_path(struct MeshTunnel *t, struct MeshPeerPath *p)
1188 struct MeshTunnelPathNode *parent;
1189 struct MeshTunnelPathNode *n;
1190 struct GNUNET_PeerIdentity id;
1191 struct GNUNET_PeerIdentity hop;
1197 if (n->peer->id != p->peers[0])
1200 return GNUNET_SYSERR;
1202 /* Ignore return value, if not found it's ok. */
1203 GNUNET_PEER_resolve(p->peers[p->length - 1], &id);
1204 tunnel_del_path(t, peer_info_get(&id));
1205 /* Look for the first node that is not already present in the tree
1207 * Assuming that the tree is somewhat balanced, O(log n * log N).
1208 * - Length of the path is expected to be log N (size of whole network).
1209 * - Each level of the tree is expected to have log n children (size of tree).
1211 for (i = 1, me = -1; i < p->length; i++)
1214 if (p->peers[i] == myid)
1216 for (j = 0; j < n->nchildren; j++)
1218 if (n->children[j].peer->id == p->peers[i])
1220 n = &n->children[j];
1224 /* If we couldn't find a child equal to path[i], we have reached the end
1225 * of the common path. */
1231 /* New path deviates from tree before reaching us. What happened ?*/
1233 return GNUNET_SYSERR;
1235 /* Add the rest of the path as a branch from parent. */
1236 while (i < p->length)
1238 parent->children = GNUNET_realloc(parent->children, parent->nchildren);
1239 parent->nchildren++;
1240 GNUNET_PEER_resolve(p->peers[i], &id);
1241 n->peer = peer_info_get(&id);
1244 n->status = MESH_PEER_RELAY;
1247 n->status = MESH_PEER_SEARCHING;
1248 /* Add info about first hop into hashmap. */
1249 if (me < p->length - 1)
1251 GNUNET_PEER_resolve(p->peers[p->length - 1], &id);
1252 GNUNET_PEER_resolve(p->peers[me + 1], &hop);
1253 GNUNET_CONTAINER_multihashmap_put(
1254 t->paths->first_hops,
1256 peer_info_get(&hop),
1257 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1264 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1265 * needed rescources.
1267 * @param t Tunnel we want to add a new peer to
1268 * @param peer PeerInfo of the peer being added
1272 tunnel_add_peer(struct MeshTunnel *t, struct MeshPeerInfo *peer)
1274 struct MeshPeerPath *p;
1275 struct MeshPeerPath *best_p;
1276 unsigned int best_cost;
1279 GNUNET_array_append(peer->tunnels, peer->ntunnels, t);
1280 if (NULL == (p = peer->path_head))
1284 best_cost = UINT_MAX;
1287 if ((cost = path_get_cost(t, p)) < best_cost)
1294 tunnel_add_path(t, best_p);
1295 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1296 t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME,
1302 * Notify a tunnel that a connection has broken that affects at least
1303 * some of its peers.
1305 * @param t Tunnel affected
1306 * @param peer Peer that (at least) has been affected by the disconnection
1307 * @param p1 Peer that got disconnected from p2
1308 * @param p2 Peer that got disconnected from p1
1311 tunnel_notify_connection_broken(struct MeshTunnel *t,
1312 struct MeshPeerInfo *peer,
1320 * Destroy the tunnel and free any allocated resources linked to it
1322 * @param t the tunnel to destroy
1324 * @return GNUNET_OK on success
1327 tunnel_destroy (struct MeshTunnel *t)
1329 struct MeshClient *c;
1330 struct MeshQueue *q;
1331 struct MeshQueue *qn;
1332 GNUNET_HashCode hash;
1340 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1341 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
1346 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
1347 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
1351 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
1355 if (NULL != q->data)
1356 GNUNET_free (q->data);
1360 /* TODO cancel core transmit ready in case it was active */
1367 /******************************************************************************/
1368 /**************** MESH NETWORK HANDLER HELPERS ***********************/
1369 /******************************************************************************/
1373 * Function called to notify a client about the socket
1374 * being ready to queue more data. "buf" will be
1375 * NULL and "size" zero if the socket was closed for
1376 * writing in the meantime.
1378 * @param cls closure
1379 * @param size number of bytes available in buf
1380 * @param buf where the callee should write the message
1381 * @return number of bytes written to buf
1384 send_core_create_path (void *cls, size_t size, void *buf)
1386 struct MeshPathInfo *info = cls;
1387 struct GNUNET_MESH_ManipulatePath *msg;
1388 struct GNUNET_PeerIdentity *peer_ptr;
1389 struct GNUNET_PeerIdentity id;
1390 struct MeshPeerInfo *peer = info->peer;
1391 struct MeshTunnel *t = info->t;
1392 struct MeshPeerPath *p = info->path;
1397 sizeof (struct GNUNET_MESH_ManipulatePath) +
1398 p->length * sizeof (struct GNUNET_PeerIdentity);
1400 if (size < size_needed || NULL == buf)
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
1403 GNUNET_PEER_resolve (path_get_first_hop (t, peer)->id, &id);
1404 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1405 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1406 size_needed, &send_core_create_path,
1411 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
1412 msg->header.size = htons (size_needed);
1413 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1414 msg->tid = ntohl(t->id.tid);
1416 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1417 for (i = 0; i < p->length; i++)
1419 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1431 * Function called to notify a client about the socket
1432 * being ready to queue more data. "buf" will be
1433 * NULL and "size" zero if the socket was closed for
1434 * writing in the meantime.
1436 * @param cls closure (MeshDataDescriptor with all info to build packet)
1437 * @param size number of bytes available in buf
1438 * @param buf where the callee should write the message
1439 * @return number of bytes written to buf
1442 send_core_data_to_origin (void *cls, size_t size, void *buf)
1444 struct MeshDataDescriptor *info = cls;
1445 struct GNUNET_MESH_ToOrigin *msg = buf;
1448 GNUNET_assert (NULL != info);
1449 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
1450 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1452 if (total_size > size)
1454 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1455 "not enough buffer to send data to origin\n");
1458 msg->header.size = htons (total_size);
1459 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1460 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1461 msg->tid = htonl (info->origin->tid);
1462 if (0 != info->size)
1464 memcpy (&msg[1], &info[1], info->size);
1466 if (NULL != info->client)
1468 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1476 * Function called to notify a client about the socket
1477 * being ready to queue more data. "buf" will be
1478 * NULL and "size" zero if the socket was closed for
1479 * writing in the meantime.
1481 * @param cls closure (data itself)
1482 * @param size number of bytes available in buf
1483 * @param buf where the callee should write the message
1484 * @return number of bytes written to buf
1487 send_core_data_unicast (void *cls, size_t size, void *buf)
1489 struct MeshDataDescriptor *info = cls;
1490 struct GNUNET_MESH_Unicast *msg = buf;
1493 GNUNET_assert (NULL != info);
1494 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1495 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1497 if (total_size > size)
1499 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1500 "not enough buffer to send data to peer\n");
1503 msg->header.size = htons (total_size);
1504 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1505 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1506 GNUNET_PEER_resolve (info->destination, &msg->destination);
1507 msg->tid = htonl (info->origin->tid);
1508 if (0 != info->size)
1510 memcpy (&msg[1], &info[1], info->size);
1512 if (NULL != info->client)
1514 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1522 * Function called to notify a client about the socket
1523 * being ready to queue more data. "buf" will be
1524 * NULL and "size" zero if the socket was closed for
1525 * writing in the meantime.
1527 * @param cls closure (data itself)
1528 * @param size number of bytes available in buf
1529 * @param buf where the callee should write the message
1530 * @return number of bytes written to buf
1533 send_core_data_multicast (void *cls, size_t size, void *buf)
1535 struct MeshDataDescriptor *info = cls;
1536 struct GNUNET_MESH_Multicast *msg = buf;
1539 GNUNET_assert (NULL != info);
1540 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1541 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1545 info->peer->core_transmit[info->handler_n] = NULL;
1547 if (total_size > size)
1549 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1550 "not enough buffer to send data futher\n");
1553 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1554 msg->header.size = htons (total_size);
1555 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1556 msg->tid = htonl (info->origin->tid);
1557 memcpy (&msg[1], &info[1], total_size);
1558 if (0 == --info->copies)
1560 if (NULL != info->client)
1562 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1571 * Function called to notify a client about the socket
1572 * being ready to queue more data. "buf" will be
1573 * NULL and "size" zero if the socket was closed for
1574 * writing in the meantime.
1576 * @param cls closure (MeshDataDescriptor)
1577 * @param size number of bytes available in buf
1578 * @param buf where the callee should write the message
1579 * @return number of bytes written to buf
1582 send_core_path_ack (void *cls, size_t size, void *buf)
1584 struct MeshDataDescriptor *info = cls;
1585 struct GNUNET_MESH_PathACK *msg = buf;
1587 GNUNET_assert (NULL != info);
1590 info->peer->core_transmit[info->handler_n] = NULL;
1592 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1597 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1598 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1599 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1600 msg->tid = htonl (info->origin->tid);
1601 msg->peer_id = my_full_id;
1603 /* TODO add signature */
1605 return sizeof (struct GNUNET_MESH_PathACK);
1610 * Function called to notify a client about the socket
1611 * being ready to queue more data. "buf" will be
1612 * NULL and "size" zero if the socket was closed for
1613 * writing in the meantime.
1615 * @param cls closure (data itself)
1616 * @param size number of bytes available in buf
1617 * @param buf where the callee should write the message
1618 * @return number of bytes written to buf
1621 send_core_data_raw (void *cls, size_t size, void *buf)
1623 struct GNUNET_MessageHeader *msg = cls;
1626 GNUNET_assert (NULL != msg);
1627 total_size = ntohs (msg->size);
1629 if (total_size > size)
1634 memcpy (buf, msg, total_size);
1642 * Send another peer a notification to destroy a tunnel
1643 * @param cls The tunnel to destroy
1644 * @param size Size in the buffer
1645 * @param buf Memory where to put the data to transmit
1646 * @return Size of data put in buffer
1649 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1651 struct MeshTunnel *t = cls;
1652 struct MeshClient *c;
1653 struct GNUNET_MESH_TunnelMessage *msg;
1657 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1658 /*FIXME*/ msg->header.size =
1659 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1660 msg->tunnel_id = htonl (t->id.tid);
1662 tunnel_destroy (c, t);
1663 return sizeof (struct GNUNET_MESH_TunnelMessage);
1669 * Send the message to all clients that have subscribed to its type
1671 * @param msg Pointer to the message itself
1672 * @return number of clients this message was sent to
1675 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1677 struct MeshClient *c;
1681 type = ntohs (msg->type);
1682 for (count = 0, c = clients; c != NULL; c = c->next)
1684 if (client_is_subscribed (type, c))
1687 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1696 * Iterator over hash map peer entries collect all neighbors who to resend the
1699 * @param cls closure (**GNUNET_PEER_Id to store hops to send packet)
1700 * @param key current key code (peer id hash)
1701 * @param value value in the hash map (peer_info)
1702 * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not.
1705 iterate_collect_neighbors (void *cls, const GNUNET_HashCode * key, void *value)
1707 struct MeshPeerInfo *peer_info = value;
1708 struct MeshPathInfo *neighbors = cls;
1711 if (peer_info->id == myid)
1715 peer_info = path_get_first_hop (neighbors->t, peer_info);
1716 for (i = 0; i < neighbors->path->length; i++)
1718 if (neighbors->path->peers[i] == peer_info->id)
1721 GNUNET_array_append(neighbors->path->peers,
1722 neighbors->path->length,
1729 /******************************************************************************/
1730 /******************** MESH NETWORK HANDLERS **************************/
1731 /******************************************************************************/
1735 * Core handler for path creation
1736 * struct GNUNET_CORE_MessageHandler
1738 * @param cls closure
1739 * @param message message
1740 * @param peer peer identity this notification is about
1741 * @param atsi performance data
1742 * @return GNUNET_OK to keep the connection open,
1743 * GNUNET_SYSERR to close it (signal serious error)
1747 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1748 const struct GNUNET_MessageHeader *message,
1749 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1751 unsigned int own_pos;
1754 MESH_TunnelNumber tid;
1755 struct GNUNET_MESH_ManipulatePath *msg;
1756 struct GNUNET_PeerIdentity *pi;
1757 struct GNUNET_PeerIdentity id;
1758 GNUNET_HashCode hash;
1759 struct MeshPeerPath *path;
1760 struct MeshPeerInfo *dest_peer_info;
1761 struct MeshPeerInfo *orig_peer_info;
1762 struct MeshTunnel *t;
1764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1765 "MESH: Received a MESH path create msg\n");
1766 size = ntohs (message->size);
1767 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1769 GNUNET_break_op (0);
1773 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1774 if (size % sizeof (struct GNUNET_PeerIdentity))
1776 GNUNET_break_op (0);
1779 size /= sizeof (struct GNUNET_PeerIdentity);
1782 GNUNET_break_op (0);
1785 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1787 tid = ntohl (msg->tid);
1788 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1789 t = tunnel_get (pi, tid);
1793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1794 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1795 t->id.oid = GNUNET_PEER_intern (pi);
1797 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1799 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1801 GNUNET_CONTAINER_multihashmap_put (
1803 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1811 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1812 if (NULL == dest_peer_info)
1814 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1815 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1816 GNUNET_CONTAINER_multihashmap_put (
1818 &pi[size - 1].hashPubKey,
1820 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1822 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1823 if (NULL == orig_peer_info)
1825 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1826 orig_peer_info->id = GNUNET_PEER_intern (pi);
1827 GNUNET_CONTAINER_multihashmap_put (
1831 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1834 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
1835 path->length = size;
1836 path->peers = GNUNET_malloc (size * sizeof (GNUNET_PEER_Id));
1838 for (i = 0; i < size; i++)
1840 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1841 if (path->peers[i] == myid)
1845 { /* cannot be self, must be 'not found' */
1846 /* create path: self not found in path through self */
1847 GNUNET_break_op (0);
1848 path_destroy (path);
1849 /* FIXME error. destroy tunnel? leave for timeout? */
1852 if (own_pos == size - 1)
1854 /* It is for us! Send ack. */
1855 struct MeshDataDescriptor *info;
1858 path_add_to_origin (orig_peer_info, path); /* inverts path! */
1859 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1860 info->origin = &t->id;
1861 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1862 GNUNET_assert (info->peer);
1863 for (j = 0; info->peer->core_transmit[j]; j++)
1871 info->handler_n = j;
1872 info->peer->core_transmit[j] =
1873 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1874 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1875 sizeof (struct GNUNET_MessageHeader),
1876 &send_core_path_ack, info);
1880 /* It's for somebody else! Retransmit. */
1881 struct MeshPathInfo *path_info;
1883 path_info = GNUNET_malloc (sizeof(struct MeshPathInfo));
1885 path_info->path = path;
1886 path_info->peer = dest_peer_info;
1888 path_add_to_peer (dest_peer_info, path);
1889 GNUNET_PEER_resolve (path->peers[own_pos + 1], &id);
1890 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1891 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1892 sizeof (struct GNUNET_MessageHeader),
1893 &send_core_create_path,
1901 * Core handler for mesh network traffic going from the origin to a peer
1903 * @param cls closure
1904 * @param peer peer identity this notification is about
1905 * @param message message
1906 * @param atsi performance data
1907 * @return GNUNET_OK to keep the connection open,
1908 * GNUNET_SYSERR to close it (signal serious error)
1911 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1912 const struct GNUNET_MessageHeader *message,
1913 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1915 struct GNUNET_MESH_Unicast *msg;
1916 struct GNUNET_PeerIdentity id;
1917 struct MeshTunnel *t;
1918 struct MeshPeerInfo *pi;
1921 size = ntohs (message->size);
1923 sizeof (struct GNUNET_MESH_Unicast) +
1924 sizeof (struct GNUNET_MessageHeader))
1929 msg = (struct GNUNET_MESH_Unicast *) message;
1930 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1933 /* TODO notify back: we don't know this tunnel */
1936 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1937 &msg->destination.hashPubKey);
1940 /* TODO maybe feedback, log to statistics */
1945 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1948 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &id);
1949 msg = GNUNET_malloc (size);
1950 memcpy (msg, message, size);
1951 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1952 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1953 &send_core_data_raw, msg);
1959 * Core handler for mesh network traffic going from the origin to all peers
1961 * @param cls closure
1962 * @param message message
1963 * @param peer peer identity this notification is about
1964 * @param atsi performance data
1965 * @return GNUNET_OK to keep the connection open,
1966 * GNUNET_SYSERR to close it (signal serious error)
1969 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1970 const struct GNUNET_MessageHeader *message,
1971 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1973 struct GNUNET_MESH_Multicast *msg;
1974 struct GNUNET_PeerIdentity id;
1975 struct MeshDataDescriptor *info;
1976 struct MeshPathInfo neighbors;
1977 struct MeshTunnel *t;
1983 size = ntohs (message->size);
1985 sizeof (struct GNUNET_MESH_Multicast) +
1986 sizeof (struct GNUNET_MessageHeader))
1988 GNUNET_break_op (0);
1991 msg = (struct GNUNET_MESH_Multicast *) message;
1992 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1996 /* TODO notify that we dont know that tunnel */
2000 /* Transmit to locally interested clients */
2001 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2003 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
2006 /* Retransmit to other peers.
2007 * Using path here as just a collection of peers, not a path per se.
2010 neighbors.path = GNUNET_malloc (sizeof(struct MeshPeerPath));
2011 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
2013 if (0 == neighbors.path->length)
2015 GNUNET_free(neighbors.path);
2018 size -= sizeof (struct GNUNET_MESH_Multicast);
2019 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
2020 info->origin = &t->id;
2021 info->copies = neighbors.path->length;
2022 for (i = 0; i < info->copies; i++)
2024 GNUNET_PEER_resolve (neighbors.path->peers[i], &id);
2025 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
2026 GNUNET_assert (NULL != info->peer);
2027 for (j = 0; 0 != info->peer->core_transmit[j]; j++)
2029 if (j == (CORE_QUEUE_SIZE - 1))
2035 info->handler_n = j;
2036 info->peer->infos[j] = info;
2037 info->peer->core_transmit[j] =
2038 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2039 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2040 ntohs (msg->header.size),
2041 &send_core_data_multicast, info);
2043 GNUNET_free(neighbors.path->peers);
2044 GNUNET_free(neighbors.path);
2050 * Core handler for mesh network traffic
2052 * @param cls closure
2053 * @param message message
2054 * @param peer peer identity this notification is about
2055 * @param atsi performance data
2056 * @return GNUNET_OK to keep the connection open,
2057 * GNUNET_SYSERR to close it (signal serious error)
2062 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2063 const struct GNUNET_MessageHeader *message,
2064 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2066 struct GNUNET_MESH_ToOrigin *msg;
2067 struct GNUNET_PeerIdentity id;
2068 struct MeshTunnel *t;
2069 struct MeshPeerInfo *peer_info;
2072 size = ntohs (message->size);
2074 sizeof (struct GNUNET_MESH_ToOrigin) +
2075 sizeof (struct GNUNET_MessageHeader))
2077 GNUNET_break_op (0);
2080 msg = (struct GNUNET_MESH_ToOrigin *) message;
2081 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2085 /* TODO notify that we dont know this tunnel (whom)? */
2089 if (t->id.oid == myid)
2091 if (NULL == t->client)
2093 /* got data packet for ownerless tunnel */
2094 GNUNET_break_op (0);
2097 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
2101 peer_info = peer_info_get (&msg->oid);
2102 if (NULL == peer_info)
2104 /* unknown origin of tunnel */
2108 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2109 msg = GNUNET_malloc (size);
2110 memcpy (msg, message, size);
2111 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2112 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
2113 &send_core_data_raw, msg);
2120 * Core handler for path ACKs
2122 * @param cls closure
2123 * @param message message
2124 * @param peer peer identity this notification is about
2125 * @param atsi performance data
2127 * @return GNUNET_OK to keep the connection open,
2128 * GNUNET_SYSERR to close it (signal serious error)
2130 * FIXME path change state
2133 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2134 const struct GNUNET_MessageHeader *message,
2135 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2137 struct GNUNET_MESH_PathACK *msg;
2138 struct GNUNET_PeerIdentity id;
2139 struct MeshTunnel *t;
2140 struct MeshPeerInfo *peer_info;
2142 msg = (struct GNUNET_MESH_PathACK *) message;
2143 t = tunnel_get (&msg->oid, msg->tid);
2146 /* TODO notify that we don't know the tunnel */
2150 /* Message for us? */
2151 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
2153 struct GNUNET_MESH_PeerControl pc;
2155 if (NULL == t->client)
2160 peer_info = peer_info_get (&msg->peer_id);
2161 if (NULL == peer_info)
2163 GNUNET_break_op (0);
2166 /* FIXME change state of peer */
2167 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2168 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2169 pc.tunnel_id = htonl (t->local_tid);
2170 GNUNET_PEER_resolve (peer_info->id, &pc.peer);
2171 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2172 &pc.header, GNUNET_NO);
2176 peer_info = peer_info_get (&msg->oid);
2177 if (NULL == peer_info)
2179 /* If we know the tunnel, we should DEFINITELY know the peer */
2183 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2184 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
2185 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
2186 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2187 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2188 sizeof (struct GNUNET_MESH_PathACK),
2189 &send_core_data_raw, msg);
2195 * Functions to handle messages from core
2197 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2198 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
2199 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2200 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2201 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2202 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
2203 sizeof (struct GNUNET_MESH_PathACK)},
2209 /******************************************************************************/
2210 /**************** MESH LOCAL HANDLER HELPERS ***********************/
2211 /******************************************************************************/
2214 * delete_tunnel_entry: iterator for deleting each tunnel that belongs to a
2215 * client when the client disconnects.
2216 * @param cls closure (client that is disconnecting)
2217 * @param key the hash of the local tunnel id (used to access the hashmap)
2218 * @param value the value stored at the key (tunnel to destroy)
2219 * @return GNUNET_OK on success
2222 delete_tunnel_entry (void *cls, const GNUNET_HashCode * key, void *value)
2226 r = tunnel_destroy ((struct MeshTunnel *) value);
2232 * deregister_app: iterator for removing each application registered by a client
2233 * @param cls closure
2234 * @param key the hash of the application id (used to access the hashmap)
2235 * @param value the value stored at the key (client)
2236 * @return GNUNET_OK on success
2239 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
2241 GNUNET_CONTAINER_multihashmap_remove (applications, key, value);
2247 * notify_client_connection_failure: notify a client that the connection to the
2248 * requested remote peer is not possible (for instance, no route found)
2249 * Function called when the socket is ready to queue more data. "buf" will be
2250 * NULL and "size" zero if the socket was closed for writing in the meantime.
2252 * @param cls closure
2253 * @param size number of bytes available in buf
2254 * @param buf where the callee should write the message
2255 * @return number of bytes written to buf
2258 notify_client_connection_failure (void *cls, size_t size, void *buf)
2261 struct MeshPeerInfo *peer_info;
2262 struct GNUNET_MESH_PeerControl *msg;
2263 struct GNUNET_PeerIdentity id;
2265 if (0 == size && NULL == buf)
2267 // TODO retry? cancel?
2271 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
2272 peer_info = (struct MeshPeerInfo *) cls;
2273 msg = (struct GNUNET_MESH_PeerControl *) buf;
2274 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2275 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
2276 // msg->tunnel_id = htonl(peer_info->t->tid);
2277 GNUNET_PEER_resolve (peer_info->id, &id);
2278 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
2286 * Function to process paths received for a new peer addition. The recorded
2287 * paths form the initial tunnel, which can be optimized later.
2288 * Called on each result obtained for the DHT search.
2290 * @param cls closure
2291 * @param exp when will this value expire
2292 * @param key key of the result
2293 * @param get_path NULL-terminated array of pointers
2294 * to the peers on reverse GET path (or NULL if not recorded)
2295 * @param put_path NULL-terminated array of pointers
2296 * to the peers on the PUT path (or NULL if not recorded)
2297 * @param type type of the result
2298 * @param size number of bytes in data
2299 * @param data pointer to the result data
2304 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2305 const GNUNET_HashCode * key,
2306 const struct GNUNET_PeerIdentity *const *get_path,
2307 const struct GNUNET_PeerIdentity *const *put_path,
2308 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
2310 struct MeshPathInfo *path_info = cls;
2311 struct MeshPeerPath *p;
2312 struct GNUNET_PeerIdentity pi;
2315 if (NULL == get_path || NULL == put_path)
2317 if (NULL == path_info->peer->path_head)
2319 // Find ourselves some alternate initial path to the destination: retry
2320 GNUNET_DHT_get_stop (path_info->peer->dhtget);
2321 GNUNET_PEER_resolve (path_info->peer->id, &pi);
2322 path_info->peer->dhtget = GNUNET_DHT_get_start (
2323 dht_handle, /* handle */
2324 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2325 GNUNET_BLOCK_TYPE_TEST, /* type */
2326 &pi.hashPubKey, /*key to search */
2327 4, /* replication level */
2328 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2331 0, /* xquery bits */
2333 (void *) path_info);
2338 p = path_build_from_dht(get_path, put_path);
2339 path_add_to_peer (path_info->peer, p);
2340 for (i = 0; i < path_info->peer->ntunnels; i++)
2342 tunnel_add_peer(path_info->peer->tunnels[i], path_info->peer);
2344 GNUNET_free(path_info);
2351 * Function to process paths received for a new peer addition. The recorded
2352 * paths form the initial tunnel, which can be optimized later.
2353 * Called on each result obtained for the DHT search.
2355 * @param cls closure
2356 * @param exp when will this value expire
2357 * @param key key of the result
2358 * @param get_path NULL-terminated array of pointers
2359 * to the peers on reverse GET path (or NULL if not recorded)
2360 * @param put_path NULL-terminated array of pointers
2361 * to the peers on the PUT path (or NULL if not recorded)
2362 * @param type type of the result
2363 * @param size number of bytes in data
2364 * @param data pointer to the result data
2367 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2368 const GNUNET_HashCode * key,
2369 const struct GNUNET_PeerIdentity *const *get_path,
2370 const struct GNUNET_PeerIdentity *const *put_path,
2371 enum GNUNET_BLOCK_Type type, size_t size,
2374 const struct GNUNET_PeerIdentity *pi = data;
2375 struct GNUNET_PeerIdentity id;
2376 struct MeshTunnel *t = cls;
2377 struct MeshPeerInfo *peer_info;
2378 struct MeshPeerPath *p;
2381 if (size != sizeof (struct GNUNET_PeerIdentity))
2383 GNUNET_break_op (0);
2386 GNUNET_assert (NULL != t->client);
2387 GNUNET_DHT_get_stop (t->client->dht_get_type);
2388 t->client->dht_get_type = NULL;
2389 peer_info = peer_info_get (pi);
2390 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
2391 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2393 if ((NULL == get_path || NULL == put_path) &&
2394 NULL == peer_info->path_head &&
2395 NULL == peer_info->dhtget)
2397 /* we don't have a route to the peer, let's try a direct lookup */
2398 peer_info->dhtget = GNUNET_DHT_get_start (
2399 dht_handle, /* handle */
2400 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2401 GNUNET_BLOCK_TYPE_TEST, /* block type */
2402 &pi->hashPubKey, /* key to look up */
2403 10U, /* replication level */
2404 GNUNET_DHT_RO_RECORD_ROUTE, /* option to dht: record route */
2405 NULL, /* bloom filter */
2408 0, /* xquery bits */
2409 dht_get_id_handler, /* callback */
2410 peer_info); /* closure */
2413 p = path_build_from_dht(get_path, put_path);
2414 path_add_to_peer (peer_info, p);
2416 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2417 "MESH: new route for tunnel 0x%x found, has %u hops\n",
2420 for (i = 0; i < p->length; i++)
2422 GNUNET_PEER_resolve(p->peers[0], &id);
2423 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2426 GNUNET_h2s_full(&id.hashPubKey));
2430 GNUNET_PEER_resolve (p->peers[1], &id);
2431 GNUNET_CORE_notify_transmit_ready (
2432 core_handle, /* handle */
2435 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2437 sizeof (struct GNUNET_MESH_ManipulatePath) +
2438 (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
2439 &send_core_create_path, /* callback */
2440 peer_info); /* cls */
2443 /******************************************************************************/
2444 /********************* MESH LOCAL HANDLES **************************/
2445 /******************************************************************************/
2449 * Handler for client disconnection
2451 * @param cls closure
2452 * @param client identification of the client; NULL
2453 * for the last call when the server is destroyed
2456 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2458 struct MeshClient *c;
2459 struct MeshClient *next;
2461 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2465 if (c->handle != client)
2467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2471 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
2472 if (NULL != c->tunnels)
2474 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels, &delete_tunnel_entry,
2476 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2479 /* deregister clients applications */
2480 if (NULL != c->apps)
2482 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
2483 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
2485 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
2486 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
2488 GNUNET_SCHEDULER_cancel (announce_applications_task);
2489 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
2491 if (NULL != c->types)
2492 GNUNET_CONTAINER_multihashmap_destroy (c->types);
2493 if (NULL != c->dht_get_type)
2494 GNUNET_DHT_get_stop (c->dht_get_type);
2495 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2507 * Handler for new clients
2509 * @param cls closure
2510 * @param client identification of the client
2511 * @param message the actual message, which includes messages the client wants
2514 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2515 const struct GNUNET_MessageHeader *message)
2517 struct GNUNET_MESH_ClientConnect *cc_msg;
2518 struct MeshClient *c;
2519 GNUNET_MESH_ApplicationType *a;
2526 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2527 /* Check data sanity */
2528 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2529 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2530 ntypes = ntohs (cc_msg->types);
2531 napps = ntohs (cc_msg->applications);
2533 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
2536 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2540 /* Create new client structure */
2541 c = GNUNET_malloc (sizeof (struct MeshClient));
2543 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
2546 GNUNET_MESH_ApplicationType at;
2549 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
2550 for (i = 0; i < napps; i++)
2553 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
2554 /* store in clients hashmap */
2555 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
2556 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2557 /* store in global hashmap, for announcements */
2558 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
2559 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2561 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2562 announce_applications_task =
2563 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
2571 t = (uint16_t *) & a[napps];
2572 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
2573 for (i = 0; i < ntypes; i++)
2576 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
2578 /* store in clients hashmap */
2579 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
2580 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2581 /* store in global hashmap */
2582 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
2583 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
2589 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2590 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2591 GNUNET_SERVER_notification_context_add (nc, client);
2593 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2599 * Handler for requests of new tunnels
2601 * @param cls closure
2602 * @param client identification of the client
2603 * @param message the actual message
2606 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2607 const struct GNUNET_MessageHeader *message)
2609 struct GNUNET_MESH_TunnelMessage *t_msg;
2610 struct MeshTunnel *t;
2611 struct MeshClient *c;
2612 GNUNET_HashCode hash;
2614 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2616 /* Sanity check for client registration */
2617 if (NULL == (c = client_get (client)))
2620 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2624 /* Message sanity check */
2625 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2628 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2632 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2633 /* Sanity check for tunnel numbering */
2634 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2637 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2640 /* Sanity check for duplicate tunnel IDs */
2641 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
2644 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2648 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2649 while (NULL != tunnel_get_by_pi (myid, next_tid))
2650 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2651 t->id.tid = next_tid++;
2653 t->local_tid = ntohl (t_msg->tunnel_id);
2655 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2657 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2659 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2660 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2663 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2667 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2669 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2670 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2673 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2677 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2683 * Handler for requests of deleting tunnels
2685 * @param cls closure
2686 * @param client identification of the client
2687 * @param message the actual message
2690 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2691 const struct GNUNET_MessageHeader *message)
2693 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2694 struct MeshClient *c;
2695 struct MeshTunnel *t;
2696 MESH_TunnelNumber tid;
2697 GNUNET_HashCode hash;
2699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2701 /* Sanity check for client registration */
2702 if (NULL == (c = client_get (client)))
2705 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2708 /* Message sanity check */
2709 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2712 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2716 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2718 /* Retrieve tunnel */
2719 tid = ntohl (tunnel_msg->tunnel_id);
2721 /* Remove from local id hashmap */
2722 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2723 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2724 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2726 /* Remove from global id hashmap */
2727 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2728 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2730 // notify_tunnel_destroy(t);
2731 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2737 * Handler for connection requests to new peers
2739 * @param cls closure
2740 * @param client identification of the client
2741 * @param message the actual message (PeerControl)
2746 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2747 const struct GNUNET_MessageHeader *message)
2749 struct GNUNET_MESH_PeerControl *peer_msg;
2750 struct MeshClient *c;
2751 struct MeshTunnel *t;
2752 MESH_TunnelNumber tid;
2753 struct MeshPeerInfo *peer_info;
2756 /* Sanity check for client registration */
2757 if (NULL == (c = client_get (client)))
2760 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2764 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2765 /* Sanity check for message size */
2766 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2769 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2773 /* Tunnel exists? */
2774 tid = ntohl (peer_msg->tunnel_id);
2775 t = tunnel_get_by_local_id (c, tid);
2779 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2783 /* Does client own tunnel? */
2784 if (t->client->handle != client)
2787 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2792 peer_info = peer_info_get (&peer_msg->peer);
2794 /* Start DHT search if needed FIXME: if not already connected */
2795 if (NULL == peer_info->dhtget)
2797 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 */
2798 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2801 0, /* xquery bits */
2803 (void *) peer_info);
2806 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2812 * Handler for disconnection requests of peers in a tunnel
2814 * @param cls closure
2815 * @param client identification of the client
2816 * @param message the actual message (PeerControl)
2819 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2820 const struct GNUNET_MessageHeader *message)
2822 struct GNUNET_MESH_PeerControl *peer_msg;
2823 struct MeshClient *c;
2824 struct MeshTunnel *t;
2825 MESH_TunnelNumber tid;
2827 /* Sanity check for client registration */
2828 if (NULL == (c = client_get (client)))
2831 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2834 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2835 /* Sanity check for message size */
2836 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2839 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2843 /* Tunnel exists? */
2844 tid = ntohl (peer_msg->tunnel_id);
2845 t = tunnel_get_by_local_id (c, tid);
2849 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2853 /* Does client own tunnel? */
2854 if (t->client->handle != client)
2857 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2861 /* Ok, delete peer from tunnel */
2862 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2863 &peer_msg->peer.hashPubKey);
2865 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2871 * Handler for connection requests to new peers by type
2873 * @param cls closure
2874 * @param client identification of the client
2875 * @param message the actual message (ConnectPeerByType)
2878 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2879 const struct GNUNET_MessageHeader *message)
2881 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2882 struct MeshClient *c;
2883 struct MeshTunnel *t;
2884 GNUNET_HashCode hash;
2885 GNUNET_MESH_ApplicationType type;
2886 MESH_TunnelNumber tid;
2888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
2889 /* Sanity check for client registration */
2890 if (NULL == (c = client_get (client)))
2893 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2897 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2898 /* Sanity check for message size */
2899 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
2900 ntohs (connect_msg->header.size))
2903 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2907 /* Tunnel exists? */
2908 tid = ntohl (connect_msg->tunnel_id);
2909 t = tunnel_get_by_local_id (c, tid);
2913 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2917 /* Does client own tunnel? */
2918 if (t->client->handle != client)
2921 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2925 /* Do WE have the service? */
2926 type = ntohl (connect_msg->type);
2927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type);
2928 GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash);
2929 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
2932 /* Yes! Fast forward, add ourselves to the tunnel and send the
2933 * good news to the client
2935 struct GNUNET_MESH_PeerControl pc;
2937 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
2938 pc.peer = my_full_id;
2939 GNUNET_CONTAINER_multihashmap_put (t->peers, &pc.peer.hashPubKey,
2940 peer_info_get (&pc.peer),
2941 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2942 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2943 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2944 pc.tunnel_id = htonl (t->local_tid);
2945 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
2946 GNUNET_SERVER_notification_context_unicast (nc, /* context */
2948 &pc.header, /* msg */
2949 GNUNET_NO); /* can drop? */
2950 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
2951 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2954 /* Ok, lets find a peer offering the service */
2955 if (c->dht_get_type)
2957 GNUNET_DHT_get_stop (c->dht_get_type);
2959 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
2960 GNUNET_h2s_full (&hash));
2962 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
2963 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
2964 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
2965 &dht_get_type_handler, t);
2967 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2973 * Handler for client traffic directed to one peer
2975 * @param cls closure
2976 * @param client identification of the client
2977 * @param message the actual message
2980 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
2981 const struct GNUNET_MessageHeader *message)
2983 struct MeshClient *c;
2984 struct MeshTunnel *t;
2985 struct MeshPeerInfo *pi;
2986 struct GNUNET_MESH_Unicast *data_msg;
2987 struct GNUNET_PeerIdentity next_hop;
2988 struct MeshDataDescriptor *info;
2989 MESH_TunnelNumber tid;
2992 /* Sanity check for client registration */
2993 if (NULL == (c = client_get (client)))
2996 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2999 data_msg = (struct GNUNET_MESH_Unicast *) message;
3000 /* Sanity check for message size */
3001 if (sizeof (struct GNUNET_MESH_Unicast) +
3002 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
3005 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3009 /* Tunnel exists? */
3010 tid = ntohl (data_msg->tid);
3011 t = tunnel_get_by_local_id (c, tid);
3015 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3019 /* Is it a local tunnel? Then, does client own the tunnel? */
3020 if (t->client->handle != NULL && t->client->handle != client)
3023 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3027 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3028 &data_msg->destination.hashPubKey);
3029 /* Is the selected peer in the tunnel? */
3033 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3038 struct GNUNET_MESH_Unicast copy;
3040 /* Work around const limitation */
3041 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
3042 copy.oid = my_full_id;
3043 copy.tid = htonl (t->id.tid);
3044 handle_mesh_data_unicast (NULL, &my_full_id, ©.header, NULL);
3047 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &next_hop);
3048 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
3049 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
3050 memcpy (&info[1], &data_msg[1], data_size);
3051 info->destination = pi->id;
3052 info->origin = &t->id;
3053 info->size = data_size;
3054 info->client = client;
3055 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
3056 GNUNET_TIME_UNIT_FOREVER_REL, &next_hop,
3057 /* FIXME re-check types */
3059 sizeof (struct GNUNET_MESH_Unicast),
3060 &send_core_data_unicast, info);
3065 * Handler for client traffic directed to all peers in a tunnel
3067 * @param cls closure
3068 * @param client identification of the client
3069 * @param message the actual message
3072 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
3073 const struct GNUNET_MessageHeader *message)
3075 struct MeshClient *c;
3076 struct MeshTunnel *t;
3077 struct GNUNET_MESH_Multicast *data_msg;
3078 MESH_TunnelNumber tid;
3080 /* Sanity check for client registration */
3081 if (NULL == (c = client_get (client)))
3084 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3087 data_msg = (struct GNUNET_MESH_Multicast *) message;
3088 /* Sanity check for message size */
3089 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
3092 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3096 /* Tunnel exists? */
3097 tid = ntohl (data_msg->tid);
3098 t = tunnel_get_by_local_id (c, tid);
3102 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3106 /* Does client own tunnel? */
3107 if (t->client->handle != client)
3110 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3116 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3121 * Functions to handle messages from clients
3123 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
3124 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
3125 {&handle_local_tunnel_create, NULL,
3126 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
3127 sizeof (struct GNUNET_MESH_TunnelMessage)},
3128 {&handle_local_tunnel_destroy, NULL,
3129 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
3130 sizeof (struct GNUNET_MESH_TunnelMessage)},
3131 {&handle_local_connect_add, NULL,
3132 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
3133 sizeof (struct GNUNET_MESH_PeerControl)},
3134 {&handle_local_connect_del, NULL,
3135 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
3136 sizeof (struct GNUNET_MESH_PeerControl)},
3137 {&handle_local_connect_by_type, NULL,
3138 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
3139 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
3140 {&handle_local_unicast, NULL,
3141 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3142 {&handle_local_unicast, NULL,
3143 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3144 {&handle_local_multicast, NULL,
3145 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3151 * To be called on core init/fail.
3153 * @param cls service closure
3154 * @param server handle to the server for this service
3155 * @param identity the public identity of this peer
3156 * @param publicKey the public key of this peer
3159 core_init (void *cls, struct GNUNET_CORE_Handle *server,
3160 const struct GNUNET_PeerIdentity *identity,
3161 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
3163 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
3164 core_handle = server;
3165 my_full_id = *identity;
3166 myid = GNUNET_PEER_intern (identity);
3167 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
3172 * Method called whenever a given peer connects.
3174 * @param cls closure
3175 * @param peer peer identity this notification is about
3176 * @param atsi performance data for the connection
3179 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
3180 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
3182 // GNUNET_PEER_Id pid;
3183 struct MeshPeerInfo *peer_info;
3184 struct MeshPeerPath *path;
3186 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
3187 peer_info = peer_info_get (peer);
3188 if (myid == peer_info->id)
3190 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3192 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
3194 path->peers = GNUNET_malloc (sizeof (GNUNET_PEER_Id) * 2);
3195 path->peers[0] = myid;
3196 path->peers[1] = peer_info->id;
3197 path_add_to_peer (peer_info, path);
3202 * Method called whenever a peer disconnects.
3204 * @param cls closure
3205 * @param peer peer identity this notification is about
3208 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
3210 struct MeshPeerInfo *pi;
3213 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
3214 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
3220 for (i = 0; i < CORE_QUEUE_SIZE; i++)
3222 if (pi->core_transmit[i])
3224 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
3225 /* TODO: notify that tranmission has failed */
3226 GNUNET_free (pi->infos[i]);
3229 path_remove_from_peer (pi, pi->id, myid);
3232 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3238 /******************************************************************************/
3239 /************************ MAIN FUNCTIONS ****************************/
3240 /******************************************************************************/
3243 * Task run during shutdown.
3249 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3251 struct MeshClient *c;
3253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
3254 if (core_handle != NULL)
3256 GNUNET_CORE_disconnect (core_handle);
3259 if (dht_handle != NULL)
3261 for (c = clients; NULL != c; c = c->next)
3262 if (NULL != c->dht_get_type)
3263 GNUNET_DHT_get_stop (c->dht_get_type);
3264 GNUNET_DHT_disconnect (dht_handle);
3269 GNUNET_SERVER_notification_context_destroy (nc);
3272 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
3274 GNUNET_SCHEDULER_cancel (announce_id_task);
3275 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
3277 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
3281 * Process mesh requests.
3283 * @param cls closure
3284 * @param server the initialized server
3285 * @param c configuration to use
3288 run (void *cls, struct GNUNET_SERVER_Handle *server,
3289 const struct GNUNET_CONFIGURATION_Handle *c)
3291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
3292 GNUNET_SERVER_add_handlers (server, client_handlers);
3293 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3294 server_handle = server;
3295 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
3296 CORE_QUEUE_SIZE, /* queue size */
3297 NULL, /* Closure passed to MESH functions */
3298 &core_init, /* Call core_init once connected */
3299 &core_connect, /* Handle connects */
3300 &core_disconnect, /* remove peers on disconnects */
3301 NULL, /* Do we care about "status" updates? */
3302 NULL, /* Don't notify about all incoming messages */
3303 GNUNET_NO, /* For header only in notification */
3304 NULL, /* Don't notify about all outbound messages */
3305 GNUNET_NO, /* For header-only out notification */
3306 core_handlers); /* Register these handlers */
3307 if (core_handle == NULL)
3311 dht_handle = GNUNET_DHT_connect (c, 64);
3312 if (dht_handle == NULL)
3314 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
3315 Running without DHT has a severe\
3316 impact in MESH capabilities.\n\
3317 Plase check your configuretion and enable DHT.\n");
3323 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3324 peers = GNUNET_CONTAINER_multihashmap_create (32);
3325 applications = GNUNET_CONTAINER_multihashmap_create (32);
3326 types = GNUNET_CONTAINER_multihashmap_create (32);
3327 nc = GNUNET_SERVER_notification_context_create (server_handle,
3330 clients_tail = NULL;
3332 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3334 /* Scheduled the task to clean up when shutdown is called */
3335 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
3338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
3342 * The main function for the mesh service.
3344 * @param argc number of arguments from the command line
3345 * @param argv command line arguments
3346 * @return 0 ok, 1 on error
3349 main (int argc, char *const *argv)
3353 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
3356 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
3358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");