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(&root->children[i], peer);
1135 * Recusively mark peer and children as disconnected, notify client
1137 * @param parent Node to be clean, potentially with children
1140 tunnel_mark_peers_disconnected (struct MeshTunnelPathNode *parent)
1142 struct GNUNET_MESH_PeerControl msg;
1145 parent->status = MESH_PEER_RECONNECTING;
1146 for (i = 0; i < parent->nchildren; i++)
1148 tunnel_mark_peers_disconnected (&parent->children[i]);
1150 if (NULL == parent->t->client)
1152 msg.header.size = htons(sizeof(msg));
1153 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1154 msg.tunnel_id = htonl(parent->t->local_tid);
1155 GNUNET_PEER_resolve(parent->peer->id, &msg.peer);
1156 GNUNET_SERVER_notification_context_unicast (nc, parent->t->client->handle,
1157 &msg.header, GNUNET_NO);
1161 * Delete the current path to the peer, including all now unused relays.
1163 * @param t Tunnel where to add the new path.
1164 * @param p Path to be integrated.
1166 * @return pointer to the pathless node, NULL on error
1168 * TODO: notify peers of deletion
1170 static struct MeshTunnelPathNode *
1171 tunnel_del_path(struct MeshTunnel *t, struct MeshPeerInfo *peer)
1173 struct MeshTunnelPathNode *parent;
1174 struct MeshTunnelPathNode *node;
1175 struct MeshTunnelPathNode *n;
1177 node = n = tunnel_find_peer(t->paths->me, peer);
1182 while (NULL != parent &&
1183 MESH_PEER_RELAY == parent->status &&
1184 1 == parent->nchildren)
1187 GNUNET_free(parent->children);
1188 parent = parent->parent;
1192 *n = parent->children[parent->nchildren - 1];
1193 parent->nchildren--;
1194 parent->children = GNUNET_realloc (parent->children, parent->nchildren);
1196 tunnel_mark_peers_disconnected(node);
1203 * Integrate a stand alone path into the tunnel tree.
1205 * @param t Tunnel where to add the new path.
1206 * @param p Path to be integrated.
1208 * @return GNUNET_OK in case of success.
1209 * GNUNET_SYSERR in case of error.
1212 * - go backwards on path looking for each peer in the present tree
1215 tunnel_add_path(struct MeshTunnel *t, struct MeshPeerPath *p)
1217 struct MeshTunnelPathNode *parent;
1218 struct MeshTunnelPathNode *oldnode;
1219 struct MeshTunnelPathNode *n;
1220 struct GNUNET_PeerIdentity id;
1221 struct GNUNET_PeerIdentity hop;
1227 if (n->peer->id != p->peers[0])
1230 return GNUNET_SYSERR;
1232 /* Ignore return value, if not found it's ok. */
1233 GNUNET_PEER_resolve(p->peers[p->length - 1], &id);
1234 oldnode = tunnel_del_path(t, peer_info_get(&id));
1235 /* Look for the first node that is not already present in the tree
1237 * Assuming that the tree is somewhat balanced, O(log n * log N).
1238 * - Length of the path is expected to be log N (size of whole network).
1239 * - Each level of the tree is expected to have log n children (size of tree).
1241 for (i = 1, me = -1; i < p->length; i++)
1244 if (p->peers[i] == myid)
1246 for (j = 0; j < n->nchildren; j++)
1248 if (n->children[j].peer->id == p->peers[i])
1250 n = &n->children[j];
1254 /* If we couldn't find a child equal to path[i], we have reached the end
1255 * of the common path. */
1261 /* New path deviates from tree before reaching us. What happened? */
1263 return GNUNET_SYSERR;
1265 /* Add the rest of the path as a branch from parent. */
1266 while (i < p->length)
1268 parent->nchildren++;
1269 parent->children = GNUNET_realloc(parent->children, parent->nchildren);
1270 n = &parent->children[parent->nchildren - 1];
1271 if (i == p->length - 1)
1273 if (NULL != oldnode)
1275 /* Assignation and free can be misleading, using explicit mempcy */
1276 memcpy (n, oldnode, sizeof(struct MeshTunnelPathNode));
1277 GNUNET_free (oldnode);
1283 n->status = MESH_PEER_RELAY;
1284 GNUNET_PEER_resolve(p->peers[i], &id);
1285 n->peer = peer_info_get(&id);
1292 /* Add info about first hop into hashmap. */
1293 if (me < p->length - 1)
1295 GNUNET_PEER_resolve(p->peers[p->length - 1], &id);
1296 GNUNET_PEER_resolve(p->peers[me + 1], &hop);
1297 GNUNET_CONTAINER_multihashmap_put(
1298 t->paths->first_hops,
1300 peer_info_get(&hop),
1301 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST);
1308 * Add a peer to a tunnel, accomodating paths accordingly and initializing all
1309 * needed rescources.
1311 * @param t Tunnel we want to add a new peer to
1312 * @param peer PeerInfo of the peer being added
1316 tunnel_add_peer(struct MeshTunnel *t, struct MeshPeerInfo *peer)
1318 struct MeshPeerPath *p;
1319 struct MeshPeerPath *best_p;
1320 unsigned int best_cost;
1323 GNUNET_array_append(peer->tunnels, peer->ntunnels, t);
1324 if (NULL == (p = peer->path_head))
1328 best_cost = UINT_MAX;
1331 if ((cost = path_get_cost(t, p)) < best_cost)
1338 tunnel_add_path(t, best_p);
1339 if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task)
1340 t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME,
1346 * Notify a tunnel that a connection has broken that affects at least
1347 * some of its peers.
1349 * @param t Tunnel affected
1350 * @param peer Peer that (at least) has been affected by the disconnection
1351 * @param p1 Peer that got disconnected from p2
1352 * @param p2 Peer that got disconnected from p1
1355 tunnel_notify_connection_broken(struct MeshTunnel *t,
1356 struct MeshPeerInfo *peer,
1364 * Destroy the tunnel and free any allocated resources linked to it
1366 * @param t the tunnel to destroy
1368 * @return GNUNET_OK on success
1371 tunnel_destroy (struct MeshTunnel *t)
1373 struct MeshClient *c;
1374 struct MeshQueue *q;
1375 struct MeshQueue *qn;
1376 GNUNET_HashCode hash;
1384 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1385 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
1390 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
1391 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
1395 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
1399 if (NULL != q->data)
1400 GNUNET_free (q->data);
1404 /* TODO cancel core transmit ready in case it was active */
1411 /******************************************************************************/
1412 /**************** MESH NETWORK HANDLER HELPERS ***********************/
1413 /******************************************************************************/
1417 * Function called to notify a client about the socket
1418 * being ready to queue more data. "buf" will be
1419 * NULL and "size" zero if the socket was closed for
1420 * writing in the meantime.
1422 * @param cls closure
1423 * @param size number of bytes available in buf
1424 * @param buf where the callee should write the message
1425 * @return number of bytes written to buf
1428 send_core_create_path (void *cls, size_t size, void *buf)
1430 struct MeshPathInfo *info = cls;
1431 struct GNUNET_MESH_ManipulatePath *msg;
1432 struct GNUNET_PeerIdentity *peer_ptr;
1433 struct GNUNET_PeerIdentity id;
1434 struct MeshPeerInfo *peer = info->peer;
1435 struct MeshTunnel *t = info->t;
1436 struct MeshPeerPath *p = info->path;
1441 sizeof (struct GNUNET_MESH_ManipulatePath) +
1442 p->length * sizeof (struct GNUNET_PeerIdentity);
1444 if (size < size_needed || NULL == buf)
1446 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
1447 GNUNET_PEER_resolve (path_get_first_hop (t, peer)->id, &id);
1448 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1449 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1450 size_needed, &send_core_create_path,
1455 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
1456 msg->header.size = htons (size_needed);
1457 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
1458 msg->tid = ntohl(t->id.tid);
1460 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
1461 for (i = 0; i < p->length; i++)
1463 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
1475 * Function called to notify a client about the socket
1476 * being ready to queue more data. "buf" will be
1477 * NULL and "size" zero if the socket was closed for
1478 * writing in the meantime.
1480 * @param cls closure (MeshDataDescriptor with all info to build packet)
1481 * @param size number of bytes available in buf
1482 * @param buf where the callee should write the message
1483 * @return number of bytes written to buf
1486 send_core_data_to_origin (void *cls, size_t size, void *buf)
1488 struct MeshDataDescriptor *info = cls;
1489 struct GNUNET_MESH_ToOrigin *msg = buf;
1492 GNUNET_assert (NULL != info);
1493 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
1494 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1496 if (total_size > size)
1498 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1499 "not enough buffer to send data to origin\n");
1502 msg->header.size = htons (total_size);
1503 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1504 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1505 msg->tid = htonl (info->origin->tid);
1506 if (0 != info->size)
1508 memcpy (&msg[1], &info[1], info->size);
1510 if (NULL != info->client)
1512 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1520 * Function called to notify a client about the socket
1521 * being ready to queue more data. "buf" will be
1522 * NULL and "size" zero if the socket was closed for
1523 * writing in the meantime.
1525 * @param cls closure (data itself)
1526 * @param size number of bytes available in buf
1527 * @param buf where the callee should write the message
1528 * @return number of bytes written to buf
1531 send_core_data_unicast (void *cls, size_t size, void *buf)
1533 struct MeshDataDescriptor *info = cls;
1534 struct GNUNET_MESH_Unicast *msg = buf;
1537 GNUNET_assert (NULL != info);
1538 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1539 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1541 if (total_size > size)
1543 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1544 "not enough buffer to send data to peer\n");
1547 msg->header.size = htons (total_size);
1548 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1549 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1550 GNUNET_PEER_resolve (info->destination, &msg->destination);
1551 msg->tid = htonl (info->origin->tid);
1552 if (0 != info->size)
1554 memcpy (&msg[1], &info[1], info->size);
1556 if (NULL != info->client)
1558 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1566 * Function called to notify a client about the socket
1567 * being ready to queue more data. "buf" will be
1568 * NULL and "size" zero if the socket was closed for
1569 * writing in the meantime.
1571 * @param cls closure (data itself)
1572 * @param size number of bytes available in buf
1573 * @param buf where the callee should write the message
1574 * @return number of bytes written to buf
1577 send_core_data_multicast (void *cls, size_t size, void *buf)
1579 struct MeshDataDescriptor *info = cls;
1580 struct GNUNET_MESH_Multicast *msg = buf;
1583 GNUNET_assert (NULL != info);
1584 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1585 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1589 info->peer->core_transmit[info->handler_n] = NULL;
1591 if (total_size > size)
1593 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1594 "not enough buffer to send data futher\n");
1597 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1598 msg->header.size = htons (total_size);
1599 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1600 msg->tid = htonl (info->origin->tid);
1601 memcpy (&msg[1], &info[1], total_size);
1602 if (0 == --info->copies)
1604 if (NULL != info->client)
1606 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1615 * Function called to notify a client about the socket
1616 * being ready to queue more data. "buf" will be
1617 * NULL and "size" zero if the socket was closed for
1618 * writing in the meantime.
1620 * @param cls closure (MeshDataDescriptor)
1621 * @param size number of bytes available in buf
1622 * @param buf where the callee should write the message
1623 * @return number of bytes written to buf
1626 send_core_path_ack (void *cls, size_t size, void *buf)
1628 struct MeshDataDescriptor *info = cls;
1629 struct GNUNET_MESH_PathACK *msg = buf;
1631 GNUNET_assert (NULL != info);
1634 info->peer->core_transmit[info->handler_n] = NULL;
1636 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1641 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1642 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1643 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1644 msg->tid = htonl (info->origin->tid);
1645 msg->peer_id = my_full_id;
1647 /* TODO add signature */
1649 return sizeof (struct GNUNET_MESH_PathACK);
1654 * Function called to notify a client about the socket
1655 * being ready to queue more data. "buf" will be
1656 * NULL and "size" zero if the socket was closed for
1657 * writing in the meantime.
1659 * @param cls closure (data itself)
1660 * @param size number of bytes available in buf
1661 * @param buf where the callee should write the message
1662 * @return number of bytes written to buf
1665 send_core_data_raw (void *cls, size_t size, void *buf)
1667 struct GNUNET_MessageHeader *msg = cls;
1670 GNUNET_assert (NULL != msg);
1671 total_size = ntohs (msg->size);
1673 if (total_size > size)
1678 memcpy (buf, msg, total_size);
1686 * Send another peer a notification to destroy a tunnel
1687 * @param cls The tunnel to destroy
1688 * @param size Size in the buffer
1689 * @param buf Memory where to put the data to transmit
1690 * @return Size of data put in buffer
1693 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1695 struct MeshTunnel *t = cls;
1696 struct MeshClient *c;
1697 struct GNUNET_MESH_TunnelMessage *msg;
1701 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1702 /*FIXME*/ msg->header.size =
1703 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1704 msg->tunnel_id = htonl (t->id.tid);
1706 tunnel_destroy (c, t);
1707 return sizeof (struct GNUNET_MESH_TunnelMessage);
1713 * Send the message to all clients that have subscribed to its type
1715 * @param msg Pointer to the message itself
1716 * @return number of clients this message was sent to
1719 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1721 struct MeshClient *c;
1725 type = ntohs (msg->type);
1726 for (count = 0, c = clients; c != NULL; c = c->next)
1728 if (client_is_subscribed (type, c))
1731 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1740 * Iterator over hash map peer entries collect all neighbors who to resend the
1743 * @param cls closure (**GNUNET_PEER_Id to store hops to send packet)
1744 * @param key current key code (peer id hash)
1745 * @param value value in the hash map (peer_info)
1746 * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not.
1749 iterate_collect_neighbors (void *cls, const GNUNET_HashCode * key, void *value)
1751 struct MeshPeerInfo *peer_info = value;
1752 struct MeshPathInfo *neighbors = cls;
1755 if (peer_info->id == myid)
1759 peer_info = path_get_first_hop (neighbors->t, peer_info);
1760 for (i = 0; i < neighbors->path->length; i++)
1762 if (neighbors->path->peers[i] == peer_info->id)
1765 GNUNET_array_append(neighbors->path->peers,
1766 neighbors->path->length,
1773 /******************************************************************************/
1774 /******************** MESH NETWORK HANDLERS **************************/
1775 /******************************************************************************/
1779 * Core handler for path creation
1780 * struct GNUNET_CORE_MessageHandler
1782 * @param cls closure
1783 * @param message message
1784 * @param peer peer identity this notification is about
1785 * @param atsi performance data
1786 * @return GNUNET_OK to keep the connection open,
1787 * GNUNET_SYSERR to close it (signal serious error)
1791 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1792 const struct GNUNET_MessageHeader *message,
1793 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1795 unsigned int own_pos;
1798 MESH_TunnelNumber tid;
1799 struct GNUNET_MESH_ManipulatePath *msg;
1800 struct GNUNET_PeerIdentity *pi;
1801 struct GNUNET_PeerIdentity id;
1802 GNUNET_HashCode hash;
1803 struct MeshPeerPath *path;
1804 struct MeshPeerInfo *dest_peer_info;
1805 struct MeshPeerInfo *orig_peer_info;
1806 struct MeshTunnel *t;
1808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1809 "MESH: Received a MESH path create msg\n");
1810 size = ntohs (message->size);
1811 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1813 GNUNET_break_op (0);
1817 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1818 if (size % sizeof (struct GNUNET_PeerIdentity))
1820 GNUNET_break_op (0);
1823 size /= sizeof (struct GNUNET_PeerIdentity);
1826 GNUNET_break_op (0);
1829 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1831 tid = ntohl (msg->tid);
1832 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1833 t = tunnel_get (pi, tid);
1837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1838 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1839 t->id.oid = GNUNET_PEER_intern (pi);
1841 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1843 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1845 GNUNET_CONTAINER_multihashmap_put (
1847 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1855 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1856 if (NULL == dest_peer_info)
1858 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1859 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1860 GNUNET_CONTAINER_multihashmap_put (
1862 &pi[size - 1].hashPubKey,
1864 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1866 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1867 if (NULL == orig_peer_info)
1869 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1870 orig_peer_info->id = GNUNET_PEER_intern (pi);
1871 GNUNET_CONTAINER_multihashmap_put (
1875 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1878 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
1879 path->length = size;
1880 path->peers = GNUNET_malloc (size * sizeof (GNUNET_PEER_Id));
1882 for (i = 0; i < size; i++)
1884 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1885 if (path->peers[i] == myid)
1889 { /* cannot be self, must be 'not found' */
1890 /* create path: self not found in path through self */
1891 GNUNET_break_op (0);
1892 path_destroy (path);
1893 /* FIXME error. destroy tunnel? leave for timeout? */
1896 if (own_pos == size - 1)
1898 /* It is for us! Send ack. */
1899 struct MeshDataDescriptor *info;
1902 path_add_to_origin (orig_peer_info, path); /* inverts path! */
1903 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1904 info->origin = &t->id;
1905 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1906 GNUNET_assert (info->peer);
1907 for (j = 0; info->peer->core_transmit[j]; j++)
1915 info->handler_n = j;
1916 info->peer->core_transmit[j] =
1917 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1918 GNUNET_TIME_UNIT_FOREVER_REL, peer,
1919 sizeof (struct GNUNET_MessageHeader),
1920 &send_core_path_ack, info);
1924 /* It's for somebody else! Retransmit. */
1925 struct MeshPathInfo *path_info;
1927 path_info = GNUNET_malloc (sizeof(struct MeshPathInfo));
1929 path_info->path = path;
1930 path_info->peer = dest_peer_info;
1932 path_add_to_peer (dest_peer_info, path);
1933 GNUNET_PEER_resolve (path->peers[own_pos + 1], &id);
1934 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1935 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1936 sizeof (struct GNUNET_MessageHeader),
1937 &send_core_create_path,
1945 * Core handler for mesh network traffic going from the origin to a peer
1947 * @param cls closure
1948 * @param peer peer identity this notification is about
1949 * @param message message
1950 * @param atsi performance data
1951 * @return GNUNET_OK to keep the connection open,
1952 * GNUNET_SYSERR to close it (signal serious error)
1955 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1956 const struct GNUNET_MessageHeader *message,
1957 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1959 struct GNUNET_MESH_Unicast *msg;
1960 struct GNUNET_PeerIdentity id;
1961 struct MeshTunnel *t;
1962 struct MeshPeerInfo *pi;
1965 size = ntohs (message->size);
1967 sizeof (struct GNUNET_MESH_Unicast) +
1968 sizeof (struct GNUNET_MessageHeader))
1973 msg = (struct GNUNET_MESH_Unicast *) message;
1974 t = tunnel_get (&msg->oid, ntohl (msg->tid));
1977 /* TODO notify back: we don't know this tunnel */
1980 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1981 &msg->destination.hashPubKey);
1984 /* TODO maybe feedback, log to statistics */
1989 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1992 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &id);
1993 msg = GNUNET_malloc (size);
1994 memcpy (msg, message, size);
1995 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1996 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1997 &send_core_data_raw, msg);
2003 * Core handler for mesh network traffic going from the origin to all peers
2005 * @param cls closure
2006 * @param message message
2007 * @param peer peer identity this notification is about
2008 * @param atsi performance data
2009 * @return GNUNET_OK to keep the connection open,
2010 * GNUNET_SYSERR to close it (signal serious error)
2013 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
2014 const struct GNUNET_MessageHeader *message,
2015 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2017 struct GNUNET_MESH_Multicast *msg;
2018 struct GNUNET_PeerIdentity id;
2019 struct MeshDataDescriptor *info;
2020 struct MeshPathInfo neighbors;
2021 struct MeshTunnel *t;
2027 size = ntohs (message->size);
2029 sizeof (struct GNUNET_MESH_Multicast) +
2030 sizeof (struct GNUNET_MessageHeader))
2032 GNUNET_break_op (0);
2035 msg = (struct GNUNET_MESH_Multicast *) message;
2036 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2040 /* TODO notify that we dont know that tunnel */
2044 /* Transmit to locally interested clients */
2045 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey))
2047 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
2050 /* Retransmit to other peers.
2051 * Using path here as just a collection of peers, not a path per se.
2054 neighbors.path = GNUNET_malloc (sizeof(struct MeshPeerPath));
2055 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
2057 if (0 == neighbors.path->length)
2059 GNUNET_free(neighbors.path);
2062 size -= sizeof (struct GNUNET_MESH_Multicast);
2063 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
2064 info->origin = &t->id;
2065 info->copies = neighbors.path->length;
2066 for (i = 0; i < info->copies; i++)
2068 GNUNET_PEER_resolve (neighbors.path->peers[i], &id);
2069 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
2070 GNUNET_assert (NULL != info->peer);
2071 for (j = 0; 0 != info->peer->core_transmit[j]; j++)
2073 if (j == (CORE_QUEUE_SIZE - 1))
2079 info->handler_n = j;
2080 info->peer->infos[j] = info;
2081 info->peer->core_transmit[j] =
2082 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2083 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2084 ntohs (msg->header.size),
2085 &send_core_data_multicast, info);
2087 GNUNET_free(neighbors.path->peers);
2088 GNUNET_free(neighbors.path);
2094 * Core handler for mesh network traffic
2096 * @param cls closure
2097 * @param message message
2098 * @param peer peer identity this notification is about
2099 * @param atsi performance data
2100 * @return GNUNET_OK to keep the connection open,
2101 * GNUNET_SYSERR to close it (signal serious error)
2106 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
2107 const struct GNUNET_MessageHeader *message,
2108 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2110 struct GNUNET_MESH_ToOrigin *msg;
2111 struct GNUNET_PeerIdentity id;
2112 struct MeshTunnel *t;
2113 struct MeshPeerInfo *peer_info;
2116 size = ntohs (message->size);
2118 sizeof (struct GNUNET_MESH_ToOrigin) +
2119 sizeof (struct GNUNET_MessageHeader))
2121 GNUNET_break_op (0);
2124 msg = (struct GNUNET_MESH_ToOrigin *) message;
2125 t = tunnel_get (&msg->oid, ntohl (msg->tid));
2129 /* TODO notify that we dont know this tunnel (whom)? */
2133 if (t->id.oid == myid)
2135 if (NULL == t->client)
2137 /* got data packet for ownerless tunnel */
2138 GNUNET_break_op (0);
2141 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
2145 peer_info = peer_info_get (&msg->oid);
2146 if (NULL == peer_info)
2148 /* unknown origin of tunnel */
2152 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2153 msg = GNUNET_malloc (size);
2154 memcpy (msg, message, size);
2155 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2156 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
2157 &send_core_data_raw, msg);
2164 * Core handler for path ACKs
2166 * @param cls closure
2167 * @param message message
2168 * @param peer peer identity this notification is about
2169 * @param atsi performance data
2171 * @return GNUNET_OK to keep the connection open,
2172 * GNUNET_SYSERR to close it (signal serious error)
2174 * FIXME path change state
2177 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
2178 const struct GNUNET_MessageHeader *message,
2179 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2181 struct GNUNET_MESH_PathACK *msg;
2182 struct GNUNET_PeerIdentity id;
2183 struct MeshTunnel *t;
2184 struct MeshPeerInfo *peer_info;
2186 msg = (struct GNUNET_MESH_PathACK *) message;
2187 t = tunnel_get (&msg->oid, msg->tid);
2190 /* TODO notify that we don't know the tunnel */
2194 /* Message for us? */
2195 if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity)))
2197 struct GNUNET_MESH_PeerControl pc;
2199 if (NULL == t->client)
2204 peer_info = peer_info_get (&msg->peer_id);
2205 if (NULL == peer_info)
2207 GNUNET_break_op (0);
2210 /* FIXME change state of peer */
2211 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2212 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2213 pc.tunnel_id = htonl (t->local_tid);
2214 GNUNET_PEER_resolve (peer_info->id, &pc.peer);
2215 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
2216 &pc.header, GNUNET_NO);
2220 peer_info = peer_info_get (&msg->oid);
2221 if (NULL == peer_info)
2223 /* If we know the tunnel, we should DEFINITELY know the peer */
2227 GNUNET_PEER_resolve (path_get_first_hop (t, peer_info)->id, &id);
2228 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
2229 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
2230 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2231 GNUNET_TIME_UNIT_FOREVER_REL, &id,
2232 sizeof (struct GNUNET_MESH_PathACK),
2233 &send_core_data_raw, msg);
2239 * Functions to handle messages from core
2241 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
2242 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
2243 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2244 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2245 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2246 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
2247 sizeof (struct GNUNET_MESH_PathACK)},
2253 /******************************************************************************/
2254 /**************** MESH LOCAL HANDLER HELPERS ***********************/
2255 /******************************************************************************/
2258 * delete_tunnel_entry: iterator for deleting each tunnel that belongs to a
2259 * client when the client disconnects.
2260 * @param cls closure (client that is disconnecting)
2261 * @param key the hash of the local tunnel id (used to access the hashmap)
2262 * @param value the value stored at the key (tunnel to destroy)
2263 * @return GNUNET_OK on success
2266 delete_tunnel_entry (void *cls, const GNUNET_HashCode * key, void *value)
2270 r = tunnel_destroy ((struct MeshTunnel *) value);
2276 * deregister_app: iterator for removing each application registered by a client
2277 * @param cls closure
2278 * @param key the hash of the application id (used to access the hashmap)
2279 * @param value the value stored at the key (client)
2280 * @return GNUNET_OK on success
2283 deregister_app (void *cls, const GNUNET_HashCode * key, void *value)
2285 GNUNET_CONTAINER_multihashmap_remove (applications, key, value);
2291 * notify_client_connection_failure: notify a client that the connection to the
2292 * requested remote peer is not possible (for instance, no route found)
2293 * Function called when the socket is ready to queue more data. "buf" will be
2294 * NULL and "size" zero if the socket was closed for writing in the meantime.
2296 * @param cls closure
2297 * @param size number of bytes available in buf
2298 * @param buf where the callee should write the message
2299 * @return number of bytes written to buf
2302 notify_client_connection_failure (void *cls, size_t size, void *buf)
2305 struct MeshPeerInfo *peer_info;
2306 struct GNUNET_MESH_PeerControl *msg;
2307 struct GNUNET_PeerIdentity id;
2309 if (0 == size && NULL == buf)
2311 // TODO retry? cancel?
2315 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
2316 peer_info = (struct MeshPeerInfo *) cls;
2317 msg = (struct GNUNET_MESH_PeerControl *) buf;
2318 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2319 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
2320 // msg->tunnel_id = htonl(peer_info->t->tid);
2321 GNUNET_PEER_resolve (peer_info->id, &id);
2322 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
2330 * Function to process paths received for a new peer addition. The recorded
2331 * paths form the initial tunnel, which can be optimized later.
2332 * Called on each result obtained for the DHT search.
2334 * @param cls closure
2335 * @param exp when will this value expire
2336 * @param key key of the result
2337 * @param get_path NULL-terminated array of pointers
2338 * to the peers on reverse GET path (or NULL if not recorded)
2339 * @param put_path NULL-terminated array of pointers
2340 * to the peers on the PUT path (or NULL if not recorded)
2341 * @param type type of the result
2342 * @param size number of bytes in data
2343 * @param data pointer to the result data
2348 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2349 const GNUNET_HashCode * key,
2350 const struct GNUNET_PeerIdentity *const *get_path,
2351 const struct GNUNET_PeerIdentity *const *put_path,
2352 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
2354 struct MeshPathInfo *path_info = cls;
2355 struct MeshPeerPath *p;
2356 struct GNUNET_PeerIdentity pi;
2359 if (NULL == get_path || NULL == put_path)
2361 if (NULL == path_info->peer->path_head)
2363 // Find ourselves some alternate initial path to the destination: retry
2364 GNUNET_DHT_get_stop (path_info->peer->dhtget);
2365 GNUNET_PEER_resolve (path_info->peer->id, &pi);
2366 path_info->peer->dhtget = GNUNET_DHT_get_start (
2367 dht_handle, /* handle */
2368 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2369 GNUNET_BLOCK_TYPE_TEST, /* type */
2370 &pi.hashPubKey, /*key to search */
2371 4, /* replication level */
2372 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2375 0, /* xquery bits */
2377 (void *) path_info);
2382 p = path_build_from_dht(get_path, put_path);
2383 path_add_to_peer (path_info->peer, p);
2384 for (i = 0; i < path_info->peer->ntunnels; i++)
2386 tunnel_add_peer(path_info->peer->tunnels[i], path_info->peer);
2388 GNUNET_free(path_info);
2395 * Function to process paths received for a new peer addition. The recorded
2396 * paths form the initial tunnel, which can be optimized later.
2397 * Called on each result obtained for the DHT search.
2399 * @param cls closure
2400 * @param exp when will this value expire
2401 * @param key key of the result
2402 * @param get_path NULL-terminated array of pointers
2403 * to the peers on reverse GET path (or NULL if not recorded)
2404 * @param put_path NULL-terminated array of pointers
2405 * to the peers on the PUT path (or NULL if not recorded)
2406 * @param type type of the result
2407 * @param size number of bytes in data
2408 * @param data pointer to the result data
2411 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
2412 const GNUNET_HashCode * key,
2413 const struct GNUNET_PeerIdentity *const *get_path,
2414 const struct GNUNET_PeerIdentity *const *put_path,
2415 enum GNUNET_BLOCK_Type type, size_t size,
2418 const struct GNUNET_PeerIdentity *pi = data;
2419 struct GNUNET_PeerIdentity id;
2420 struct MeshTunnel *t = cls;
2421 struct MeshPeerInfo *peer_info;
2422 struct MeshPeerPath *p;
2425 if (size != sizeof (struct GNUNET_PeerIdentity))
2427 GNUNET_break_op (0);
2430 GNUNET_assert (NULL != t->client);
2431 GNUNET_DHT_get_stop (t->client->dht_get_type);
2432 t->client->dht_get_type = NULL;
2433 peer_info = peer_info_get (pi);
2434 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
2435 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2437 if ((NULL == get_path || NULL == put_path) &&
2438 NULL == peer_info->path_head &&
2439 NULL == peer_info->dhtget)
2441 /* we don't have a route to the peer, let's try a direct lookup */
2442 peer_info->dhtget = GNUNET_DHT_get_start (
2443 dht_handle, /* handle */
2444 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2445 GNUNET_BLOCK_TYPE_TEST, /* block type */
2446 &pi->hashPubKey, /* key to look up */
2447 10U, /* replication level */
2448 GNUNET_DHT_RO_RECORD_ROUTE, /* option to dht: record route */
2449 NULL, /* bloom filter */
2452 0, /* xquery bits */
2453 dht_get_id_handler, /* callback */
2454 peer_info); /* closure */
2457 p = path_build_from_dht(get_path, put_path);
2458 path_add_to_peer (peer_info, p);
2460 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2461 "MESH: new route for tunnel 0x%x found, has %u hops\n",
2464 for (i = 0; i < p->length; i++)
2466 GNUNET_PEER_resolve(p->peers[0], &id);
2467 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
2470 GNUNET_h2s_full(&id.hashPubKey));
2474 GNUNET_PEER_resolve (p->peers[1], &id);
2475 GNUNET_CORE_notify_transmit_ready (
2476 core_handle, /* handle */
2479 GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */
2481 sizeof (struct GNUNET_MESH_ManipulatePath) +
2482 (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */
2483 &send_core_create_path, /* callback */
2484 peer_info); /* cls */
2487 /******************************************************************************/
2488 /********************* MESH LOCAL HANDLES **************************/
2489 /******************************************************************************/
2493 * Handler for client disconnection
2495 * @param cls closure
2496 * @param client identification of the client; NULL
2497 * for the last call when the server is destroyed
2500 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2502 struct MeshClient *c;
2503 struct MeshClient *next;
2505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2509 if (c->handle != client)
2511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2515 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n");
2516 if (NULL != c->tunnels)
2518 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels, &delete_tunnel_entry,
2520 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2523 /* deregister clients applications */
2524 if (NULL != c->apps)
2526 GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL);
2527 GNUNET_CONTAINER_multihashmap_destroy (c->apps);
2529 if (0 == GNUNET_CONTAINER_multihashmap_size (applications) &&
2530 GNUNET_SCHEDULER_NO_TASK != announce_applications_task)
2532 GNUNET_SCHEDULER_cancel (announce_applications_task);
2533 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
2535 if (NULL != c->types)
2536 GNUNET_CONTAINER_multihashmap_destroy (c->types);
2537 if (NULL != c->dht_get_type)
2538 GNUNET_DHT_get_stop (c->dht_get_type);
2539 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2551 * Handler for new clients
2553 * @param cls closure
2554 * @param client identification of the client
2555 * @param message the actual message, which includes messages the client wants
2558 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2559 const struct GNUNET_MessageHeader *message)
2561 struct GNUNET_MESH_ClientConnect *cc_msg;
2562 struct MeshClient *c;
2563 GNUNET_MESH_ApplicationType *a;
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2571 /* Check data sanity */
2572 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2573 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2574 ntypes = ntohs (cc_msg->types);
2575 napps = ntohs (cc_msg->applications);
2577 ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType))
2580 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2584 /* Create new client structure */
2585 c = GNUNET_malloc (sizeof (struct MeshClient));
2587 a = (GNUNET_MESH_ApplicationType *) &cc_msg[1];
2590 GNUNET_MESH_ApplicationType at;
2593 c->apps = GNUNET_CONTAINER_multihashmap_create (napps);
2594 for (i = 0; i < napps; i++)
2597 GNUNET_CRYPTO_hash (&at, sizeof (at), &hc);
2598 /* store in clients hashmap */
2599 GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c,
2600 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2601 /* store in global hashmap, for announcements */
2602 GNUNET_CONTAINER_multihashmap_put (applications, &hc, c,
2603 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2605 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2606 announce_applications_task =
2607 GNUNET_SCHEDULER_add_now (&announce_applications, NULL);
2615 t = (uint16_t *) & a[napps];
2616 c->types = GNUNET_CONTAINER_multihashmap_create (ntypes);
2617 for (i = 0; i < ntypes; i++)
2620 GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc);
2622 /* store in clients hashmap */
2623 GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c,
2624 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2625 /* store in global hashmap */
2626 GNUNET_CONTAINER_multihashmap_put (types, &hc, c,
2627 GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
2630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2631 "MESH: client has %u+%u subscriptions\n", napps, ntypes);
2633 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2634 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2635 GNUNET_SERVER_notification_context_add (nc, client);
2637 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2643 * Handler for requests of new tunnels
2645 * @param cls closure
2646 * @param client identification of the client
2647 * @param message the actual message
2650 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2651 const struct GNUNET_MessageHeader *message)
2653 struct GNUNET_MESH_TunnelMessage *t_msg;
2654 struct MeshTunnel *t;
2655 struct MeshClient *c;
2656 GNUNET_HashCode hash;
2658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2660 /* Sanity check for client registration */
2661 if (NULL == (c = client_get (client)))
2664 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2668 /* Message sanity check */
2669 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2672 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2676 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2677 /* Sanity check for tunnel numbering */
2678 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2681 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2684 /* Sanity check for duplicate tunnel IDs */
2685 if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id)))
2688 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2692 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2693 while (NULL != tunnel_get_by_pi (myid, next_tid))
2694 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2695 t->id.tid = next_tid++;
2697 t->local_tid = ntohl (t_msg->tunnel_id);
2699 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2701 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2703 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2704 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2707 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2711 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2713 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2714 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2717 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2721 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2727 * Handler for requests of deleting tunnels
2729 * @param cls closure
2730 * @param client identification of the client
2731 * @param message the actual message
2734 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2735 const struct GNUNET_MessageHeader *message)
2737 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2738 struct MeshClient *c;
2739 struct MeshTunnel *t;
2740 MESH_TunnelNumber tid;
2741 GNUNET_HashCode hash;
2743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2745 /* Sanity check for client registration */
2746 if (NULL == (c = client_get (client)))
2749 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2752 /* Message sanity check */
2753 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2756 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2760 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2762 /* Retrieve tunnel */
2763 tid = ntohl (tunnel_msg->tunnel_id);
2765 /* Remove from local id hashmap */
2766 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2767 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2768 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2770 /* Remove from global id hashmap */
2771 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2772 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2774 // notify_tunnel_destroy(t);
2775 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2781 * Handler for connection requests to new peers
2783 * @param cls closure
2784 * @param client identification of the client
2785 * @param message the actual message (PeerControl)
2790 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2791 const struct GNUNET_MessageHeader *message)
2793 struct GNUNET_MESH_PeerControl *peer_msg;
2794 struct MeshClient *c;
2795 struct MeshTunnel *t;
2796 MESH_TunnelNumber tid;
2797 struct MeshPeerInfo *peer_info;
2800 /* Sanity check for client registration */
2801 if (NULL == (c = client_get (client)))
2804 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2808 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2809 /* Sanity check for message size */
2810 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2813 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2817 /* Tunnel exists? */
2818 tid = ntohl (peer_msg->tunnel_id);
2819 t = tunnel_get_by_local_id (c, tid);
2823 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2827 /* Does client own tunnel? */
2828 if (t->client->handle != client)
2831 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2836 peer_info = peer_info_get (&peer_msg->peer);
2838 /* Start DHT search if needed FIXME: if not already connected */
2839 if (NULL == peer_info->dhtget)
2841 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 */
2842 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2845 0, /* xquery bits */
2847 (void *) peer_info);
2850 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2856 * Handler for disconnection requests of peers in a tunnel
2858 * @param cls closure
2859 * @param client identification of the client
2860 * @param message the actual message (PeerControl)
2863 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2864 const struct GNUNET_MessageHeader *message)
2866 struct GNUNET_MESH_PeerControl *peer_msg;
2867 struct MeshClient *c;
2868 struct MeshTunnel *t;
2869 MESH_TunnelNumber tid;
2871 /* Sanity check for client registration */
2872 if (NULL == (c = client_get (client)))
2875 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2878 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2879 /* Sanity check for message size */
2880 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2883 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2887 /* Tunnel exists? */
2888 tid = ntohl (peer_msg->tunnel_id);
2889 t = tunnel_get_by_local_id (c, tid);
2893 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2897 /* Does client own tunnel? */
2898 if (t->client->handle != client)
2901 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2905 /* Ok, delete peer from tunnel */
2906 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2907 &peer_msg->peer.hashPubKey);
2909 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2915 * Handler for connection requests to new peers by type
2917 * @param cls closure
2918 * @param client identification of the client
2919 * @param message the actual message (ConnectPeerByType)
2922 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2923 const struct GNUNET_MessageHeader *message)
2925 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2926 struct MeshClient *c;
2927 struct MeshTunnel *t;
2928 GNUNET_HashCode hash;
2929 GNUNET_MESH_ApplicationType type;
2930 MESH_TunnelNumber tid;
2932 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n");
2933 /* Sanity check for client registration */
2934 if (NULL == (c = client_get (client)))
2937 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2941 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2942 /* Sanity check for message size */
2943 if (sizeof (struct GNUNET_MESH_ConnectPeerByType) !=
2944 ntohs (connect_msg->header.size))
2947 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2951 /* Tunnel exists? */
2952 tid = ntohl (connect_msg->tunnel_id);
2953 t = tunnel_get_by_local_id (c, tid);
2957 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2961 /* Does client own tunnel? */
2962 if (t->client->handle != client)
2965 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2969 /* Do WE have the service? */
2970 type = ntohl (connect_msg->type);
2971 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type);
2972 GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash);
2973 if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) ==
2976 /* Yes! Fast forward, add ourselves to the tunnel and send the
2977 * good news to the client
2979 struct GNUNET_MESH_PeerControl pc;
2981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n");
2982 pc.peer = my_full_id;
2983 GNUNET_CONTAINER_multihashmap_put (t->peers, &pc.peer.hashPubKey,
2984 peer_info_get (&pc.peer),
2985 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2986 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2987 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2988 pc.tunnel_id = htonl (t->local_tid);
2989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n");
2990 GNUNET_SERVER_notification_context_unicast (nc, /* context */
2992 &pc.header, /* msg */
2993 GNUNET_NO); /* can drop? */
2994 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n");
2995 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2998 /* Ok, lets find a peer offering the service */
2999 if (c->dht_get_type)
3001 GNUNET_DHT_get_stop (c->dht_get_type);
3003 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n",
3004 GNUNET_h2s_full (&hash));
3006 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
3007 GNUNET_BLOCK_TYPE_TEST, &hash, 10U,
3008 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
3009 &dht_get_type_handler, t);
3011 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3017 * Handler for client traffic directed to one peer
3019 * @param cls closure
3020 * @param client identification of the client
3021 * @param message the actual message
3024 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
3025 const struct GNUNET_MessageHeader *message)
3027 struct MeshClient *c;
3028 struct MeshTunnel *t;
3029 struct MeshPeerInfo *pi;
3030 struct GNUNET_MESH_Unicast *data_msg;
3031 struct GNUNET_PeerIdentity next_hop;
3032 struct MeshDataDescriptor *info;
3033 MESH_TunnelNumber tid;
3036 /* Sanity check for client registration */
3037 if (NULL == (c = client_get (client)))
3040 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3043 data_msg = (struct GNUNET_MESH_Unicast *) message;
3044 /* Sanity check for message size */
3045 if (sizeof (struct GNUNET_MESH_Unicast) +
3046 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
3049 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3053 /* Tunnel exists? */
3054 tid = ntohl (data_msg->tid);
3055 t = tunnel_get_by_local_id (c, tid);
3059 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3063 /* Is it a local tunnel? Then, does client own the tunnel? */
3064 if (t->client->handle != NULL && t->client->handle != client)
3067 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3071 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
3072 &data_msg->destination.hashPubKey);
3073 /* Is the selected peer in the tunnel? */
3077 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3082 struct GNUNET_MESH_Unicast copy;
3084 /* Work around const limitation */
3085 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
3086 copy.oid = my_full_id;
3087 copy.tid = htonl (t->id.tid);
3088 handle_mesh_data_unicast (NULL, &my_full_id, ©.header, NULL);
3091 GNUNET_PEER_resolve (path_get_first_hop (t, pi)->id, &next_hop);
3092 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
3093 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
3094 memcpy (&info[1], &data_msg[1], data_size);
3095 info->destination = pi->id;
3096 info->origin = &t->id;
3097 info->size = data_size;
3098 info->client = client;
3099 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
3100 GNUNET_TIME_UNIT_FOREVER_REL, &next_hop,
3101 /* FIXME re-check types */
3103 sizeof (struct GNUNET_MESH_Unicast),
3104 &send_core_data_unicast, info);
3109 * Handler for client traffic directed to all peers in a tunnel
3111 * @param cls closure
3112 * @param client identification of the client
3113 * @param message the actual message
3116 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
3117 const struct GNUNET_MessageHeader *message)
3119 struct MeshClient *c;
3120 struct MeshTunnel *t;
3121 struct GNUNET_MESH_Multicast *data_msg;
3122 MESH_TunnelNumber tid;
3124 /* Sanity check for client registration */
3125 if (NULL == (c = client_get (client)))
3128 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3131 data_msg = (struct GNUNET_MESH_Multicast *) message;
3132 /* Sanity check for message size */
3133 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
3136 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3140 /* Tunnel exists? */
3141 tid = ntohl (data_msg->tid);
3142 t = tunnel_get_by_local_id (c, tid);
3146 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3150 /* Does client own tunnel? */
3151 if (t->client->handle != client)
3154 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
3160 GNUNET_SERVER_receive_done (client, GNUNET_OK);
3165 * Functions to handle messages from clients
3167 static struct GNUNET_SERVER_MessageHandler client_handlers[] = {
3168 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
3169 {&handle_local_tunnel_create, NULL,
3170 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
3171 sizeof (struct GNUNET_MESH_TunnelMessage)},
3172 {&handle_local_tunnel_destroy, NULL,
3173 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
3174 sizeof (struct GNUNET_MESH_TunnelMessage)},
3175 {&handle_local_connect_add, NULL,
3176 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
3177 sizeof (struct GNUNET_MESH_PeerControl)},
3178 {&handle_local_connect_del, NULL,
3179 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
3180 sizeof (struct GNUNET_MESH_PeerControl)},
3181 {&handle_local_connect_by_type, NULL,
3182 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
3183 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
3184 {&handle_local_unicast, NULL,
3185 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
3186 {&handle_local_unicast, NULL,
3187 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
3188 {&handle_local_multicast, NULL,
3189 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
3195 * To be called on core init/fail.
3197 * @param cls service closure
3198 * @param server handle to the server for this service
3199 * @param identity the public identity of this peer
3200 * @param publicKey the public key of this peer
3203 core_init (void *cls, struct GNUNET_CORE_Handle *server,
3204 const struct GNUNET_PeerIdentity *identity,
3205 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
3207 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
3208 core_handle = server;
3209 my_full_id = *identity;
3210 myid = GNUNET_PEER_intern (identity);
3211 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
3216 * Method called whenever a given peer connects.
3218 * @param cls closure
3219 * @param peer peer identity this notification is about
3220 * @param atsi performance data for the connection
3223 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
3224 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
3226 // GNUNET_PEER_Id pid;
3227 struct MeshPeerInfo *peer_info;
3228 struct MeshPeerPath *path;
3230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
3231 peer_info = peer_info_get (peer);
3232 if (myid == peer_info->id)
3234 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3236 path = GNUNET_malloc (sizeof (struct MeshPeerPath));
3238 path->peers = GNUNET_malloc (sizeof (GNUNET_PEER_Id) * 2);
3239 path->peers[0] = myid;
3240 path->peers[1] = peer_info->id;
3241 path_add_to_peer (peer_info, path);
3246 * Method called whenever a peer disconnects.
3248 * @param cls closure
3249 * @param peer peer identity this notification is about
3252 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
3254 struct MeshPeerInfo *pi;
3257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
3258 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
3264 for (i = 0; i < CORE_QUEUE_SIZE; i++)
3266 if (pi->core_transmit[i])
3268 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
3269 /* TODO: notify that tranmission has failed */
3270 GNUNET_free (pi->infos[i]);
3273 path_remove_from_peer (pi, pi->id, myid);
3276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
3282 /******************************************************************************/
3283 /************************ MAIN FUNCTIONS ****************************/
3284 /******************************************************************************/
3287 * Task run during shutdown.
3293 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3295 struct MeshClient *c;
3297 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
3298 if (core_handle != NULL)
3300 GNUNET_CORE_disconnect (core_handle);
3303 if (dht_handle != NULL)
3305 for (c = clients; NULL != c; c = c->next)
3306 if (NULL != c->dht_get_type)
3307 GNUNET_DHT_get_stop (c->dht_get_type);
3308 GNUNET_DHT_disconnect (dht_handle);
3313 GNUNET_SERVER_notification_context_destroy (nc);
3316 if (GNUNET_SCHEDULER_NO_TASK != announce_id_task)
3318 GNUNET_SCHEDULER_cancel (announce_id_task);
3319 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
3321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
3325 * Process mesh requests.
3327 * @param cls closure
3328 * @param server the initialized server
3329 * @param c configuration to use
3332 run (void *cls, struct GNUNET_SERVER_Handle *server,
3333 const struct GNUNET_CONFIGURATION_Handle *c)
3335 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
3336 GNUNET_SERVER_add_handlers (server, client_handlers);
3337 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3338 server_handle = server;
3339 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
3340 CORE_QUEUE_SIZE, /* queue size */
3341 NULL, /* Closure passed to MESH functions */
3342 &core_init, /* Call core_init once connected */
3343 &core_connect, /* Handle connects */
3344 &core_disconnect, /* remove peers on disconnects */
3345 NULL, /* Do we care about "status" updates? */
3346 NULL, /* Don't notify about all incoming messages */
3347 GNUNET_NO, /* For header only in notification */
3348 NULL, /* Don't notify about all outbound messages */
3349 GNUNET_NO, /* For header-only out notification */
3350 core_handlers); /* Register these handlers */
3351 if (core_handle == NULL)
3355 dht_handle = GNUNET_DHT_connect (c, 64);
3356 if (dht_handle == NULL)
3358 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
3359 Running without DHT has a severe\
3360 impact in MESH capabilities.\n\
3361 Plase check your configuretion and enable DHT.\n");
3367 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
3368 peers = GNUNET_CONTAINER_multihashmap_create (32);
3369 applications = GNUNET_CONTAINER_multihashmap_create (32);
3370 types = GNUNET_CONTAINER_multihashmap_create (32);
3371 nc = GNUNET_SERVER_notification_context_create (server_handle,
3374 clients_tail = NULL;
3376 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
3378 /* Scheduled the task to clean up when shutdown is called */
3379 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
3382 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
3386 * The main function for the mesh service.
3388 * @param argc number of arguments from the command line
3389 * @param argv command line arguments
3390 * @return 0 ok, 1 on error
3393 main (int argc, char *const *argv)
3397 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
3400 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
3402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");