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
65 mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
69 if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason)
73 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s", s);
77 /* TODO: move into configuration file */
78 #define CORE_QUEUE_SIZE 10
79 #define LOCAL_QUEUE_SIZE 100
80 #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\
81 GNUNET_TIME_UNIT_SECONDS,\
83 #define APP_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
84 GNUNET_TIME_UNIT_SECONDS,\
87 #define ID_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\
88 GNUNET_TIME_UNIT_SECONDS,\
93 /******************************************************************************/
94 /************************ DATA STRUCTURES ****************************/
95 /******************************************************************************/
98 * Information regarding a path
106 struct MeshPath *next;
107 struct MeshPath *prev;
110 * Whether the path is serving traffic in a tunnel or is a backup
115 * List of all the peers that form the path from origin to target
117 GNUNET_PEER_Id *peers;
120 * Number of peers (hops) in the path
127 * All the states a peer participating in a tunnel can be in.
132 * Path to the peer not known yet
137 * Request sent, not yet answered.
142 * Peer connected and ready to accept data
147 * Peer connected previosly but not responding
149 MESH_PEER_RECONNECTING
153 /** FWD declaration */
157 * Struct containing all info possibly needed to build a package when called
160 struct MeshDataDescriptor
162 /** ID of the tunnel this packet travels in */
163 struct MESH_TunnelID *origin;
165 /** Ultimate destination of the packet */
166 GNUNET_PEER_Id destination;
168 /** Number of identical messages sent to different hops (multicast) */
171 /** Size of the data */
174 /** Client that asked for the transmission, if any */
175 struct GNUNET_SERVER_Client *client;
177 /** Who was is message being sent to */
178 struct MeshPeerInfo *peer;
180 /** Which handler was used to request the transmission */
181 unsigned int handler_n;
183 /* Data at the end */
188 * Struct containing all information regarding a given peer
198 * Is the peer reachable? Is the peer even connected?
200 enum MeshPeerState state;
203 * Last time we heard from this peer
205 struct GNUNET_TIME_Absolute last_contact;
208 * Number of attempts to reconnect so far
210 int n_reconnect_attempts;
213 * Paths to reach the peer
215 struct MeshPath *path;
216 struct MeshPath *path_tail;
219 * Handle to stop the DHT search for a path to this peer
221 struct GNUNET_DHT_GetHandle *dhtget;
224 * Handles to stop queued transmissions for this peer
226 struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE];
229 * Pointer to info stuctures used as cls for queued transmissions
231 struct MeshDataDescriptor *infos[CORE_QUEUE_SIZE];
234 * Task to send keepalive packets over the current active path
236 GNUNET_SCHEDULER_TaskIdentifier path_refresh_task;
241 * Data scheduled to transmit (to local client or remote peer)
248 struct MeshQueue *next;
249 struct MeshQueue *prev;
252 * Target of the data (NULL if target is client)
254 struct MeshPeerInfo *peer;
257 * Client to send the data to (NULL if target is peer)
259 struct MeshClient *client;
262 * Size of the message to transmit
267 * How old is the data?
269 struct GNUNET_TIME_Absolute timestamp;
274 struct GNUNET_MessageHeader *data;
278 * Globally unique tunnel identification (owner + number)
279 * DO NOT USE OVER THE NETWORK
284 * Node that owns the tunnel
289 * Tunnel number to differentiate all the tunnels owned by the node oid
290 * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI )
292 MESH_TunnelNumber tid;
296 struct MeshClient; /* FWD declaration */
299 * Struct containing all information regarding a tunnel
300 * For an intermediate node the improtant info used will be:
301 * - id Tunnel unique identification
302 * - paths[0] To know where to send it next
303 * - metainfo: ready, speeds, accounting
310 struct MESH_TunnelID id;
313 * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 )
315 MESH_TunnelNumber local_tid;
318 * Last time the tunnel was used
320 struct GNUNET_TIME_Absolute timestamp;
323 * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo)
325 struct GNUNET_CONTAINER_MultiHashMap *peers;
328 * Number of peers that are connected and potentially ready to receive data
330 unsigned int peers_ready;
333 * Number of peers that have been added to the tunnel
335 unsigned int peers_total;
339 * Client owner of the tunnel, if any
341 struct MeshClient *client;
344 * Messages ready to transmit
346 struct MeshQueue *queue_head;
347 struct MeshQueue *queue_tail;
352 * Struct containing information about a client of the service
359 struct MeshClient *next;
360 struct MeshClient *prev;
363 * Tunnels that belong to this client, indexed by local id
365 struct GNUNET_CONTAINER_MultiHashMap *tunnels;
368 * Handle to communicate with the client
370 struct GNUNET_SERVER_Client *handle;
373 * Applications that this client has claimed to provide
375 GNUNET_MESH_ApplicationType *apps;
376 unsigned int app_counter;
379 * Messages that this client has declared interest in
382 unsigned int type_counter;
385 * Used for seachching peers offering a service
387 struct GNUNET_DHT_GetHandle *dht_get_type;
391 /******************************************************************************/
392 /*********************** GLOBAL VARIABLES ****************************/
393 /******************************************************************************/
398 static struct MeshClient *clients;
399 static struct MeshClient *clients_tail;
402 * Tunnels known, indexed by MESH_TunnelID (MeshTunnel)
404 static struct GNUNET_CONTAINER_MultiHashMap *tunnels;
407 * Peers known, indexed by PeerIdentity (MeshPeerInfo)
409 static struct GNUNET_CONTAINER_MultiHashMap *peers;
412 * Handle to communicate with core
414 static struct GNUNET_CORE_Handle *core_handle;
419 static struct GNUNET_DHT_Handle *dht_handle;
424 static struct GNUNET_SERVER_Handle *server_handle;
427 * Notification context, to send messages to local clients
429 static struct GNUNET_SERVER_NotificationContext *nc;
432 * Local peer own ID (memory efficient handle)
434 static GNUNET_PEER_Id myid;
437 * Tunnel ID for the next created tunnel (global tunnel number)
439 static MESH_TunnelNumber next_tid;
442 * All application types provided by this peer
444 static GNUNET_MESH_ApplicationType *applications;
447 * All application types provided by this peer (reference counter)
449 static unsigned int *applications_rc;
452 * Number of applications provided by this peer
454 static unsigned int n_apps;
457 * Task to periodically announce provided applications
459 GNUNET_SCHEDULER_TaskIdentifier announce_applications_task;
462 * Task to periodically announce itself in the network
464 GNUNET_SCHEDULER_TaskIdentifier announce_id_task;
467 /******************************************************************************/
468 /****************** GENERAL HELPER FUNCTIONS ************************/
469 /******************************************************************************/
472 * Retrieve the MeshPeerInfo stucture associated with the peer, create one
473 * and inster it in the appropiate structures if the peer is not known yet.
474 * @param peer Identity of the peer
475 * @return Existing or newly created peer info
477 static struct MeshPeerInfo *
478 get_peer_info (const struct GNUNET_PeerIdentity *peer)
480 struct MeshPeerInfo *peer_info;
482 peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
483 if (NULL == peer_info)
486 (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo));
487 GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info,
488 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
489 peer_info->id = GNUNET_PEER_intern (peer);
490 peer_info->state = MESH_PEER_SEARCHING;
497 * Find the first peer whom to send a packet to go down this path
498 * @param path The path to use
499 * @return short id of the next peer, myid in case of local delivery,
500 * or 0 in case of error
502 static GNUNET_PEER_Id
503 get_first_hop (struct MeshPath *path)
515 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
516 "tried to get the next hop from an invalid path\n");
520 for (i = 0; i < path->length; i++)
522 if (path->peers[i] == myid)
524 if (i < path->length - 1)
526 return path->peers[i + 1];
539 * Get the cost of the path.
540 * @param path The path to analyze
541 * @return Number of hops to reach destination, UINT_MAX in case the peer is not
545 get_path_cost (struct MeshPath *path)
551 for (i = 0; i < path->length; i++)
553 if (path->peers[i] == myid)
555 return path->length - i;
563 * Add the path to the peer and update the path used to reach it in case this
565 * @param peer_info Destination peer to add the path to.
566 * @param path New path to add. Last peer must be the peer in arg 1.
569 add_path_to_peer (struct MeshPeerInfo *peer_info, struct MeshPath *path)
572 unsigned int new_cost;
573 unsigned int best_cost;
574 struct MeshPath *aux;
575 struct MeshPath *best;
577 if (NULL == peer_info || NULL == path)
580 new_cost = get_path_cost (path);
581 best_cost = UINT_MAX;
583 for (aux = peer_info->path; aux != NULL; aux = aux->next)
585 if ((i = get_path_cost (aux)) < best_cost)
591 if (best_cost < new_cost)
594 GNUNET_CONTAINER_DLL_insert_tail (peer_info->path, peer_info->path_tail,
602 GNUNET_CONTAINER_DLL_insert (peer_info->path, peer_info->path_tail, path);
609 * Add the path to the peer and update the path used to reach it in case this
610 * is the shortest. The path is given in reverse, the destination peer is
611 * path[0]. The function modifies the path, inverting it to use the origin as
613 * @param peer_info Destination peer to add the path to.
614 * @param path New path to add. First peer must be the peer in arg 1.
617 add_path_to_origin (struct MeshPeerInfo *peer_info, struct MeshPath *path)
622 for (i = 0; i < path->length / 2; i++)
624 aux = path->peers[i];
625 path->peers[i] = path->peers[path->length - i - 1];
626 path->peers[path->length - i - 1] = aux;
628 add_path_to_peer (peer_info, path);
633 * Check if client has registered with the service and has not disconnected
634 * @param client the client to check
635 * @return non-NULL if client exists in the global DLL
637 static struct MeshClient *
638 retrieve_client (struct GNUNET_SERVER_Client *client)
640 struct MeshClient *c;
645 if (c->handle == client)
654 * Checks if a given client has subscribed to certain message type
655 * @param message_type Type of message to check
656 * @param c Client to check
657 * @return GNUNET_YES or GNUNET_NO, depending on subscription status
659 static int /* FIXME inline? */
660 is_client_subscribed (uint16_t message_type, struct MeshClient *c)
664 for (i = 0; i < c->type_counter; i++)
666 if (c->types[i] == message_type)
674 * Search for a tunnel among the tunnels for a client
675 * @param client the client whose tunnels to search in
676 * @param tid the local id of the tunnel
677 * @return tunnel handler, NULL if doesn't exist
679 static struct MeshTunnel *
680 retrieve_tunnel_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid)
682 GNUNET_HashCode hash;
684 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
685 return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
689 * Search for a tunnel by global ID using PEER_ID
690 * @param pi owner of the tunnel
691 * @param tid global tunnel number
692 * @return tunnel handler, NULL if doesn't exist
694 static struct MeshTunnel *
695 retrieve_tunnel_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid)
697 struct MESH_TunnelID id;
698 GNUNET_HashCode hash;
703 GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash);
704 return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash);
710 * Search for a tunnel by global ID using full PeerIdentities
711 * @param oid owner of the tunnel
712 * @param tid global tunnel number
713 * @return tunnel handler, NULL if doesn't exist
715 static struct MeshTunnel *
716 retrieve_tunnel (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid)
718 return retrieve_tunnel_by_pi (GNUNET_PEER_search (oid), tid);
723 * Destroy the path and free any allocated resources linked to it
724 * @param t tunnel the path belongs to
725 * @param p the path to destroy
726 * @return GNUNET_OK on success
729 destroy_path (struct MeshPath *p)
731 GNUNET_PEER_decrement_rcs (p->peers, p->length);
732 GNUNET_free (p->peers);
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 destroy_peer_info (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 tunnel and free any allocated resources linked to it
764 * @param c client the tunnel belongs to
765 * @param t the tunnel to destroy
766 * @return GNUNET_OK on success
769 destroy_tunnel (struct MeshTunnel *t)
771 struct MeshClient *c;
773 struct MeshQueue *qn;
774 GNUNET_HashCode hash;
782 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
783 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t))
788 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
789 if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t))
793 GNUNET_CONTAINER_multihashmap_destroy (t->peers);
798 GNUNET_free (q->data);
802 /* TODO cancel core transmit ready in case it was active */
808 /******************************************************************************/
809 /************************ PERIODIC FUNCTIONS ****************************/
810 /******************************************************************************/
813 * Periodically announce what applications are provided by local clients
816 * @param tc task context
819 announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
821 struct GNUNET_PeerIdentity id;
822 GNUNET_HashCode hash;
823 uint8_t buffer[12] = "MESH_APP";
827 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
829 announce_applications_task = GNUNET_SCHEDULER_NO_TASK;
832 p = (unsigned int *) &buffer[8];
833 GNUNET_PEER_resolve (myid, &id);
834 for (i = 0; i < n_apps; i++)
836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for app %d\n",
838 *p = htonl (applications[i]);
839 GNUNET_CRYPTO_hash (buffer, 12, &hash);
840 GNUNET_DHT_put (dht_handle, &hash, 10U, GNUNET_DHT_RO_RECORD_ROUTE,
841 GNUNET_BLOCK_TYPE_ANY, sizeof (struct GNUNET_PeerIdentity),
843 GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (),
847 &mesh_debug, "MESH: DHT_put for app completed\n");
852 announce_applications_task =
853 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications,
860 * Periodically announce self id in the DHT
863 * @param tc task context
866 announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
868 struct GNUNET_PeerIdentity id;
870 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
872 announce_id_task = GNUNET_SCHEDULER_NO_TASK;
875 GNUNET_PEER_resolve (myid, &id);
877 * - Set data expiration in function of X
880 GNUNET_DHT_put (dht_handle, /* DHT handle */
881 &id.hashPubKey, /* Key to use */
882 10U, /* Replication level */
883 GNUNET_DHT_RO_RECORD_ROUTE, /* DHT options */
884 GNUNET_BLOCK_TYPE_ANY, /* Block type */
885 0, /* Size of the data */
886 NULL, /* Data itself */
887 GNUNET_TIME_absolute_get_forever (), /* Data expiration */
888 GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */
890 &mesh_debug, "DHT_put for id completed\n");
892 NULL, /* Continuation */
893 NULL); /* Continuation closure */
896 GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls);
899 /******************************************************************************/
900 /**************** MESH NETWORK HANDLER HELPERS ***********************/
901 /******************************************************************************/
904 * Function called to notify a client about the socket
905 * being ready to queue more data. "buf" will be
906 * NULL and "size" zero if the socket was closed for
907 * writing in the meantime.
910 * @param size number of bytes available in buf
911 * @param buf where the callee should write the message
912 * @return number of bytes written to buf
915 send_core_create_path_for_peer (void *cls, size_t size, void *buf)
917 struct MeshPeerInfo *peer_info = cls;
918 struct GNUNET_MESH_ManipulatePath *msg;
920 struct GNUNET_PeerIdentity *peer_ptr;
921 struct GNUNET_PeerIdentity id;
925 if (0 == size && NULL == buf)
927 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n");
928 GNUNET_PEER_resolve (get_first_hop (peer_info->path), &id);
929 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
930 GNUNET_TIME_UNIT_FOREVER_REL, &id,
932 GNUNET_MESH_ManipulatePath) +
933 (peer_info->path->length *
934 sizeof (struct GNUNET_PeerIdentity)),
935 &send_core_create_path_for_peer,
949 return 0; // TODO Notify ERROR Path not found
952 sizeof (struct GNUNET_MESH_ManipulatePath) +
953 p->length * sizeof (struct GNUNET_PeerIdentity);
954 if (size < size_needed)
956 // TODO retry? cancel?
960 msg = (struct GNUNET_MESH_ManipulatePath *) buf;
961 msg->header.size = htons (size_needed);
962 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE);
964 peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1];
965 for (i = 0; i < p->length; i++)
967 GNUNET_PEER_resolve (p->peers[i], peer_ptr++);
970 peer_info->state = MESH_PEER_WAITING;
978 * Function called to notify a client about the socket
979 * being ready to queue more data. "buf" will be
980 * NULL and "size" zero if the socket was closed for
981 * writing in the meantime.
983 * @param cls closure (MeshDataDescriptor with all info to build packet)
984 * @param size number of bytes available in buf
985 * @param buf where the callee should write the message
986 * @return number of bytes written to buf
989 send_core_data_to_origin (void *cls, size_t size, void *buf)
991 struct MeshDataDescriptor *info = cls;
992 struct GNUNET_MESH_ToOrigin *msg = buf;
995 GNUNET_assert (NULL != info);
996 total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size;
997 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
999 if (total_size > size)
1001 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1002 "not enough buffer to send data to origin\n");
1005 msg->header.size = htons (total_size);
1006 msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN);
1007 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1008 msg->tid = htonl (info->origin->tid);
1009 if (0 != info->size)
1011 memcpy (&msg[1], &info[1], info->size);
1013 if (NULL != info->client)
1015 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1023 * Function called to notify a client about the socket
1024 * being ready to queue more data. "buf" will be
1025 * NULL and "size" zero if the socket was closed for
1026 * writing in the meantime.
1028 * @param cls closure (data itself)
1029 * @param size number of bytes available in buf
1030 * @param buf where the callee should write the message
1031 * @return number of bytes written to buf
1034 send_core_data_unicast (void *cls, size_t size, void *buf)
1036 struct MeshDataDescriptor *info = cls;
1037 struct GNUNET_MESH_Unicast *msg = buf;
1040 GNUNET_assert (NULL != info);
1041 total_size = sizeof (struct GNUNET_MESH_Unicast) + info->size;
1042 GNUNET_assert (total_size < 65536); /* UNIT16_MAX */
1044 if (total_size > size)
1046 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1047 "not enough buffer to send data to peer\n");
1050 msg->header.size = htons (total_size);
1051 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1052 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1053 GNUNET_PEER_resolve (info->destination, &msg->destination);
1054 msg->tid = htonl (info->origin->tid);
1055 if (0 != info->size)
1057 memcpy (&msg[1], &info[1], info->size);
1059 if (NULL != info->client)
1061 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1069 * Function called to notify a client about the socket
1070 * being ready to queue more data. "buf" will be
1071 * NULL and "size" zero if the socket was closed for
1072 * writing in the meantime.
1074 * @param cls closure (data itself)
1075 * @param size number of bytes available in buf
1076 * @param buf where the callee should write the message
1077 * @return number of bytes written to buf
1080 send_core_data_multicast (void *cls, size_t size, void *buf)
1082 struct MeshDataDescriptor *info = cls;
1083 struct GNUNET_MESH_Multicast *msg = buf;
1086 GNUNET_assert (NULL != info);
1087 total_size = info->size + sizeof (struct GNUNET_MESH_Multicast);
1088 GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE);
1092 info->peer->core_transmit[info->handler_n] = NULL;
1094 if (total_size > size)
1096 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1097 "not enough buffer to send data futher\n");
1100 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1101 msg->header.size = htons (total_size);
1102 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1103 msg->tid = htonl (info->origin->tid);
1104 memcpy (&msg[1], &info[1], total_size);
1105 if (0 == --info->copies)
1107 if (NULL != info->client)
1109 GNUNET_SERVER_receive_done (info->client, GNUNET_OK);
1118 * Function called to notify a client about the socket
1119 * being ready to queue more data. "buf" will be
1120 * NULL and "size" zero if the socket was closed for
1121 * writing in the meantime.
1123 * @param cls closure (MeshDataDescriptor)
1124 * @param size number of bytes available in buf
1125 * @param buf where the callee should write the message
1126 * @return number of bytes written to buf
1129 send_core_path_ack (void *cls, size_t size, void *buf)
1131 struct MeshDataDescriptor *info = cls;
1132 struct GNUNET_MESH_PathACK *msg = buf;
1134 GNUNET_assert (NULL != info);
1137 info->peer->core_transmit[info->handler_n] = NULL;
1139 if (sizeof (struct GNUNET_MESH_PathACK) > size)
1144 msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK));
1145 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK);
1146 GNUNET_PEER_resolve (info->origin->oid, &msg->oid);
1147 msg->tid = htonl (info->origin->tid);
1148 GNUNET_PEER_resolve (myid, &msg->peer_id);
1149 /* TODO add signature */
1151 return sizeof (struct GNUNET_MESH_PathACK);
1156 * Function called to notify a client about the socket
1157 * being ready to queue more data. "buf" will be
1158 * NULL and "size" zero if the socket was closed for
1159 * writing in the meantime.
1161 * @param cls closure (data itself)
1162 * @param size number of bytes available in buf
1163 * @param buf where the callee should write the message
1164 * @return number of bytes written to buf
1167 send_core_data_raw (void *cls, size_t size, void *buf)
1169 struct GNUNET_MessageHeader *msg = cls;
1172 GNUNET_assert (NULL != msg);
1173 total_size = ntohs (msg->size);
1175 if (total_size > size)
1180 memcpy (buf, msg, total_size);
1188 * Send another peer a notification to destroy a tunnel
1189 * @param cls The tunnel to destroy
1190 * @param size Size in the buffer
1191 * @param buf Memory where to put the data to transmit
1192 * @return Size of data put in buffer
1195 send_p2p_tunnel_destroy (void *cls, size_t size, void *buf)
1197 struct MeshTunnel *t = cls;
1198 struct MeshClient *c;
1199 struct GNUNET_MESH_TunnelMessage *msg;
1203 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1204 /*FIXME*/ msg->header.size =
1205 htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1206 msg->tunnel_id = htonl (t->id.tid);
1208 destroy_tunnel (c, t);
1209 return sizeof (struct GNUNET_MESH_TunnelMessage);
1215 * Send the message to all clients that have subscribed to its type
1217 * @param msg Pointer to the message itself
1218 * @return number of clients this message was sent to
1221 send_subscribed_clients (struct GNUNET_MessageHeader *msg)
1223 struct MeshClient *c;
1227 type = ntohs (msg->type);
1228 for (count = 0, c = clients; c != NULL; c = c->next)
1230 if (is_client_subscribed (type, c))
1233 GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg,
1242 * Iterator over hash map peer entries collect all neighbors who to resend the
1245 * @param cls closure (**GNUNET_PEER_Id to store hops to send packet)
1246 * @param key current key code (peer id hash)
1247 * @param value value in the hash map (peer_info)
1248 * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not.
1251 iterate_collect_neighbors (void *cls, const GNUNET_HashCode * key, void *value)
1253 struct MeshPeerInfo *peer_info = value;
1254 GNUNET_PEER_Id **neighbors = cls;
1258 if (peer_info->id == myid)
1262 id = get_first_hop (peer_info->path);
1263 for (i = 0; *neighbors[i] != 0; i++)
1265 if (*neighbors[i] == id)
1268 *neighbors = GNUNET_realloc (*neighbors, (i + 2) * sizeof (GNUNET_PEER_Id));
1270 *neighbors[i + 1] = 0;
1276 /******************************************************************************/
1277 /******************** MESH NETWORK HANDLERS **************************/
1278 /******************************************************************************/
1282 * Core handler for path creation
1283 * struct GNUNET_CORE_MessageHandler
1285 * @param cls closure
1286 * @param message message
1287 * @param peer peer identity this notification is about
1288 * @param atsi performance data
1289 * @return GNUNET_OK to keep the connection open,
1290 * GNUNET_SYSERR to close it (signal serious error)
1294 handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer,
1295 const struct GNUNET_MessageHeader *message,
1296 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1298 unsigned int own_pos;
1301 MESH_TunnelNumber tid;
1302 struct GNUNET_MESH_ManipulatePath *msg;
1303 struct GNUNET_PeerIdentity *pi;
1304 struct GNUNET_PeerIdentity id;
1305 GNUNET_HashCode hash;
1306 struct MeshPath *path;
1307 struct MeshPeerInfo *dest_peer_info;
1308 struct MeshPeerInfo *orig_peer_info;
1309 struct MeshTunnel *t;
1311 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1312 "MESH: Received a MESH path create msg\n");
1313 size = ntohs (message->size);
1314 if (size < sizeof (struct GNUNET_MESH_ManipulatePath))
1316 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1317 "received create path message too short\n");
1321 size -= sizeof (struct GNUNET_MESH_ManipulatePath);
1322 if (size < 2 * sizeof (struct GNUNET_PeerIdentity))
1324 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1325 "create path message lacks enough peers\n");
1328 if (size % sizeof (struct GNUNET_PeerIdentity))
1330 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1331 "create path message of wrong size\n");
1334 msg = (struct GNUNET_MESH_ManipulatePath *) message;
1335 size /= sizeof (struct GNUNET_PeerIdentity);
1337 tid = ntohl (msg->tid);
1338 pi = (struct GNUNET_PeerIdentity *) &msg[1];
1339 t = retrieve_tunnel (pi, tid);
1343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n");
1344 t = GNUNET_malloc (sizeof (struct MeshTunnel));
1345 t->id.oid = GNUNET_PEER_intern (pi);
1347 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
1349 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
1351 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
1352 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
1360 GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey);
1361 if (NULL == dest_peer_info)
1363 dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1364 dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]);
1365 dest_peer_info->state = MESH_PEER_WAITING;
1366 GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey,
1368 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1370 orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey);
1371 if (NULL == orig_peer_info)
1373 orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo));
1374 orig_peer_info->id = GNUNET_PEER_intern (pi);
1375 orig_peer_info->state = MESH_PEER_WAITING;
1376 GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info,
1377 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1381 path = GNUNET_malloc (sizeof (struct MeshPath));
1382 path->length = size;
1383 path->peers = GNUNET_malloc (size * sizeof (GNUNET_PEER_Id));
1385 for (i = 0; i < size; i++)
1387 path->peers[i] = GNUNET_PEER_intern (&pi[i]);
1388 if (path->peers[i] == myid)
1392 { /* cannot be self, must be 'not found' */
1393 /* create path: self not found in path through self */
1394 GNUNET_break_op (0);
1395 destroy_path (path);
1396 /* FIXME error. destroy tunnel? leave for timeout? */
1399 if (own_pos == size - 1)
1400 { /* it is for us! */
1401 struct MeshDataDescriptor *info;
1404 add_path_to_origin (orig_peer_info, path); /* inverts path! */
1405 GNUNET_PEER_resolve (get_first_hop (path), &id); /* path is inverted :) */
1406 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor));
1407 info->origin = &t->id;
1408 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1409 GNUNET_assert (info->peer);
1410 for (j = 0; info->peer->core_transmit[j]; j++)
1418 info->handler_n = j;
1419 info->peer->core_transmit[j] =
1420 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100,
1421 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1422 sizeof (struct GNUNET_MessageHeader),
1423 &send_core_path_ack, info);
1427 add_path_to_peer (dest_peer_info, path);
1428 GNUNET_PEER_resolve (get_first_hop (path), &id);
1429 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1430 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1431 sizeof (struct GNUNET_MessageHeader),
1432 &send_core_create_path_for_peer,
1440 * Core handler for mesh network traffic going from the origin to a peer
1442 * @param cls closure
1443 * @param message message
1444 * @param peer peer identity this notification is about
1445 * @param atsi performance data
1446 * @return GNUNET_OK to keep the connection open,
1447 * GNUNET_SYSERR to close it (signal serious error)
1450 handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1451 const struct GNUNET_MessageHeader *message,
1452 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1454 struct GNUNET_MESH_Unicast *msg;
1455 struct GNUNET_PeerIdentity id;
1456 struct MeshTunnel *t;
1457 struct MeshPeerInfo *pi;
1460 size = ntohs (message->size);
1462 sizeof (struct GNUNET_MESH_Unicast) +
1463 sizeof (struct GNUNET_MessageHeader))
1468 msg = (struct GNUNET_MESH_Unicast *) message;
1469 t = retrieve_tunnel (&msg->oid, ntohl (msg->tid));
1472 /* TODO notify back: we don't know this tunnel */
1475 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
1476 &msg->destination.hashPubKey);
1479 /* TODO maybe feedback, log to statistics */
1484 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1487 GNUNET_PEER_resolve (get_first_hop (pi->path), &id);
1488 msg = GNUNET_malloc (size);
1489 memcpy (msg, message, size);
1490 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1491 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1492 &send_core_data_raw, msg);
1498 * Core handler for mesh network traffic going from the origin to all peers
1500 * @param cls closure
1501 * @param message message
1502 * @param peer peer identity this notification is about
1503 * @param atsi performance data
1504 * @return GNUNET_OK to keep the connection open,
1505 * GNUNET_SYSERR to close it (signal serious error)
1508 handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer,
1509 const struct GNUNET_MessageHeader *message,
1510 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1512 struct GNUNET_MESH_Multicast *msg;
1513 struct GNUNET_PeerIdentity id;
1514 struct MeshTunnel *t;
1515 struct MeshDataDescriptor *info;
1516 GNUNET_PEER_Id *neighbors;
1522 size = ntohs (message->size);
1524 sizeof (struct GNUNET_MESH_Multicast) +
1525 sizeof (struct GNUNET_MessageHeader))
1527 GNUNET_break_op (0);
1530 msg = (struct GNUNET_MESH_Multicast *) message;
1531 t = retrieve_tunnel (&msg->oid, ntohl (msg->tid));
1535 /* TODO notify that we dont know that tunnel */
1539 /* Transmit to locally interested clients */
1540 GNUNET_PEER_resolve (myid, &id);
1541 if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey))
1543 send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]);
1546 /* Retransmit to other peers */
1547 neighbors = GNUNET_malloc (sizeof (GNUNET_PEER_Id));
1549 GNUNET_CONTAINER_multihashmap_iterate (t->peers, &iterate_collect_neighbors,
1555 size -= sizeof (struct GNUNET_MESH_Multicast);
1556 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + size);
1557 info->origin = &t->id;
1559 for (i = 0; 0 != neighbors[i]; i++)
1561 GNUNET_PEER_resolve (neighbors[i], &id);
1563 info->destination = neighbors[i];
1564 info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey);
1565 GNUNET_assert (info->peer);
1566 for (j = 0; info->peer->core_transmit[j]; j++)
1574 info->handler_n = j;
1575 info->peer->infos[j] = info;
1576 info->peer->core_transmit[j] =
1577 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1578 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1579 ntohs (msg->header.size),
1580 &send_core_data_multicast, info);
1587 * Core handler for mesh network traffic
1589 * @param cls closure
1590 * @param message message
1591 * @param peer peer identity this notification is about
1592 * @param atsi performance data
1593 * @return GNUNET_OK to keep the connection open,
1594 * GNUNET_SYSERR to close it (signal serious error)
1597 handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer,
1598 const struct GNUNET_MessageHeader *message,
1599 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1601 struct GNUNET_MESH_ToOrigin *msg;
1602 struct GNUNET_PeerIdentity id;
1603 struct MeshTunnel *t;
1604 struct MeshPeerInfo *peer_info;
1607 size = ntohs (message->size);
1609 sizeof (struct GNUNET_MESH_ToOrigin) +
1610 sizeof (struct GNUNET_MessageHeader))
1612 GNUNET_break_op (0);
1615 msg = (struct GNUNET_MESH_ToOrigin *) message;
1616 t = retrieve_tunnel (&msg->oid, ntohl (msg->tid));
1620 /* TODO notify that we dont know this tunnel (whom)? */
1624 if (t->id.oid == myid)
1626 if (NULL == t->client)
1628 /* got data packet for ownerless tunnel */
1629 GNUNET_break_op (0);
1632 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message,
1636 peer_info = get_peer_info (&msg->oid);
1637 if (NULL == peer_info)
1639 /* unknown origin of tunnel */
1643 GNUNET_PEER_resolve (get_first_hop (peer_info->path), &id);
1644 msg = GNUNET_malloc (size);
1645 memcpy (msg, message, size);
1646 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1647 GNUNET_TIME_UNIT_FOREVER_REL, &id, size,
1648 &send_core_data_raw, msg);
1655 * Core handler for path ACKs
1657 * @param cls closure
1658 * @param message message
1659 * @param peer peer identity this notification is about
1660 * @param atsi performance data
1661 * @return GNUNET_OK to keep the connection open,
1662 * GNUNET_SYSERR to close it (signal serious error)
1665 handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer,
1666 const struct GNUNET_MessageHeader *message,
1667 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
1669 struct GNUNET_MESH_PathACK *msg;
1670 struct GNUNET_PeerIdentity id;
1671 struct MeshTunnel *t;
1672 struct MeshPeerInfo *peer_info;
1674 msg = (struct GNUNET_MESH_PathACK *) message;
1675 t = retrieve_tunnel (&msg->oid, msg->tid);
1678 /* TODO notify that we don't know the tunnel */
1682 /* Message for us? */
1683 if (GNUNET_PEER_search (&msg->oid) == myid)
1685 struct GNUNET_MESH_PeerControl pc;
1687 if (NULL == t->client)
1692 peer_info = get_peer_info (&msg->peer_id);
1693 if (NULL == peer_info)
1695 GNUNET_break_op (0);
1698 peer_info->state = MESH_PEER_READY;
1699 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1700 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1701 pc.tunnel_id = htonl (t->local_tid);
1702 GNUNET_PEER_resolve (peer_info->id, &pc.peer);
1703 GNUNET_SERVER_notification_context_unicast (nc, t->client->handle,
1704 &pc.header, GNUNET_NO);
1708 peer_info = get_peer_info (&msg->oid);
1709 if (NULL == peer_info)
1711 /* If we know the tunnel, we should DEFINITELY know the peer */
1715 GNUNET_PEER_resolve (get_first_hop (peer_info->path), &id);
1716 msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK));
1717 memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK));
1718 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1719 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1720 sizeof (struct GNUNET_MESH_PathACK),
1721 &send_core_data_raw, msg);
1727 * Functions to handle messages from core
1729 static struct GNUNET_CORE_MessageHandler core_handlers[] = {
1730 {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0},
1731 {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
1732 {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
1733 {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
1734 {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK,
1735 sizeof (struct GNUNET_MESH_PathACK)},
1741 /******************************************************************************/
1742 /**************** MESH LOCAL HANDLER HELPERS ***********************/
1743 /******************************************************************************/
1746 * delete_tunnel_entry: iterator for deleting each tunnel that belongs to a
1747 * client when the client disconnects.
1748 * @param cls closure (client that is disconnecting)
1749 * @param key the hash of the local tunnel id (used to access the hashmap)
1750 * @param value the value stored at the key (tunnel to destroy)
1751 * @return GNUNET_OK on success
1754 delete_tunnel_entry (void *cls, const GNUNET_HashCode * key, void *value)
1758 r = destroy_tunnel ((struct MeshTunnel *) value);
1764 * notify_client_connection_failure: notify a client that the connection to the
1765 * requested remote peer is not possible (for instance, no route found)
1766 * Function called when the socket is ready to queue more data. "buf" will be
1767 * NULL and "size" zero if the socket was closed for writing in the meantime.
1769 * @param cls closure
1770 * @param size number of bytes available in buf
1771 * @param buf where the callee should write the message
1772 * @return number of bytes written to buf
1775 notify_client_connection_failure (void *cls, size_t size, void *buf)
1778 struct MeshPeerInfo *peer_info;
1779 struct GNUNET_MESH_PeerControl *msg;
1780 struct GNUNET_PeerIdentity id;
1782 if (0 == size && NULL == buf)
1784 // TODO retry? cancel?
1788 size_needed = sizeof (struct GNUNET_MESH_PeerControl);
1789 peer_info = (struct MeshPeerInfo *) cls;
1790 msg = (struct GNUNET_MESH_PeerControl *) buf;
1791 msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1792 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED);
1793 // msg->tunnel_id = htonl(peer_info->t->tid);
1794 GNUNET_PEER_resolve (peer_info->id, &id);
1795 memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity));
1803 * Send keepalive packets for a peer
1809 path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1811 struct MeshPeerInfo *peer_info = cls;
1812 struct GNUNET_PeerIdentity id;
1814 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
1816 GNUNET_PEER_resolve (get_first_hop (peer_info->path), &id);
1817 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1818 GNUNET_TIME_UNIT_FOREVER_REL, &id,
1819 sizeof (struct GNUNET_MESH_ManipulatePath)
1821 (peer_info->path->length *
1822 sizeof (struct GNUNET_PeerIdentity)),
1823 &send_core_create_path_for_peer,
1825 peer_info->path_refresh_task =
1826 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh,
1833 * Function to process paths received for a new peer addition. The recorded
1834 * paths form the initial tunnel, which can be optimized later.
1835 * Called on each result obtained for the DHT search.
1837 * @param cls closure
1838 * @param exp when will this value expire
1839 * @param key key of the result
1840 * @param get_path NULL-terminated array of pointers
1841 * to the peers on reverse GET path (or NULL if not recorded)
1842 * @param put_path NULL-terminated array of pointers
1843 * to the peers on the PUT path (or NULL if not recorded)
1844 * @param type type of the result
1845 * @param size number of bytes in data
1846 * @param data pointer to the result data
1849 dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp,
1850 const GNUNET_HashCode * key,
1851 const struct GNUNET_PeerIdentity *const *get_path,
1852 const struct GNUNET_PeerIdentity *const *put_path,
1853 enum GNUNET_BLOCK_Type type, size_t size, const void *data)
1855 struct MeshPeerInfo *peer_info = cls;
1857 struct GNUNET_PeerIdentity pi;
1860 if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path)
1862 // Find ourselves some alternate initial path to the destination: retry
1863 GNUNET_DHT_get_stop (peer_info->dhtget);
1864 GNUNET_PEER_resolve (peer_info->id, &pi);
1865 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_ANY, &pi.hashPubKey, 4, /* replication level */
1866 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
1869 0, /* xquery bits */
1871 (void *) peer_info);
1874 p = GNUNET_malloc (sizeof (struct MeshPath));
1875 for (i = 0; get_path[i] != NULL; i++) ;
1876 for (i--; i >= 0; i--)
1879 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1880 p->peers[p->length] = GNUNET_PEER_intern (get_path[i]);
1883 for (i = 0; put_path[i] != NULL; i++) ;
1884 for (i--; i >= 0; i--)
1887 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1888 p->peers[p->length] = GNUNET_PEER_intern (put_path[i]);
1891 add_path_to_peer (peer_info, p);
1892 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1893 GNUNET_TIME_UNIT_FOREVER_REL, get_path[1],
1894 sizeof (struct GNUNET_MESH_ManipulatePath)
1897 sizeof (struct GNUNET_PeerIdentity)),
1898 &send_core_create_path_for_peer,
1900 if (0 == peer_info->path_refresh_task)
1902 peer_info->path_refresh_task =
1903 GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh,
1911 * Function to process paths received for a new peer addition. The recorded
1912 * paths form the initial tunnel, which can be optimized later.
1913 * Called on each result obtained for the DHT search.
1915 * @param cls closure
1916 * @param exp when will this value expire
1917 * @param key key of the result
1918 * @param get_path NULL-terminated array of pointers
1919 * to the peers on reverse GET path (or NULL if not recorded)
1920 * @param put_path NULL-terminated array of pointers
1921 * to the peers on the PUT path (or NULL if not recorded)
1922 * @param type type of the result
1923 * @param size number of bytes in data
1924 * @param data pointer to the result data
1927 dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp,
1928 const GNUNET_HashCode * key,
1929 const struct GNUNET_PeerIdentity *const *get_path,
1930 const struct GNUNET_PeerIdentity *const *put_path,
1931 enum GNUNET_BLOCK_Type type, size_t size,
1934 const struct GNUNET_PeerIdentity *pi = data;
1935 struct MeshTunnel *t = cls;
1936 struct MeshPeerInfo *peer_info;
1941 if (size != sizeof (struct GNUNET_PeerIdentity))
1943 GNUNET_break_op (0);
1946 peer_info = get_peer_info (pi);
1947 GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info,
1948 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
1949 if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path)
1951 /* we don't have a route to the peer, let's try a direct lookup */
1952 if (NULL == peer_info->dhtget)
1954 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_ANY, &pi->hashPubKey, 10U, /* replication level */
1955 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
1958 0, /* xquery bits */
1959 dht_get_id_handler, peer_info);
1963 p = GNUNET_malloc (sizeof (struct MeshPath));
1964 for (i = 0; get_path[i] != NULL; i++) ;
1965 for (i--; i >= 0; i--)
1968 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1969 p->peers[p->length] = GNUNET_PEER_intern (get_path[i]);
1972 for (i = 0; put_path[i] != NULL; i++) ;
1973 for (i--; i >= 0; i--)
1976 GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1));
1977 p->peers[p->length] = GNUNET_PEER_intern (put_path[i]);
1980 add_path_to_peer (peer_info, p);
1981 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
1982 GNUNET_TIME_UNIT_FOREVER_REL, get_path[1],
1983 sizeof (struct GNUNET_MESH_ManipulatePath)
1986 sizeof (struct GNUNET_PeerIdentity)),
1987 &send_core_create_path_for_peer,
1992 /******************************************************************************/
1993 /********************* MESH LOCAL HANDLES **************************/
1994 /******************************************************************************/
1998 * Handler for client disconnection
2000 * @param cls closure
2001 * @param client identification of the client; NULL
2002 * for the last call when the server is destroyed
2005 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
2007 struct MeshClient *c;
2008 struct MeshClient *next;
2012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n");
2016 if (c->handle != client)
2018 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n");
2022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " matching client found, cleaning\n");
2023 GNUNET_CONTAINER_multihashmap_iterate (c->tunnels, &delete_tunnel_entry, c);
2024 GNUNET_CONTAINER_multihashmap_destroy (c->tunnels);
2025 if (0 != c->app_counter)
2027 /* deregister clients applications */
2028 for (i = 0; i < c->app_counter; i++)
2030 for (j = 0; j < n_apps; j++)
2032 if (c->apps[i] == applications[j] && 0 == --applications_rc[j])
2034 applications[j] = applications[n_apps - 1];
2035 GNUNET_array_grow (applications, n_apps, n_apps - 1);
2037 applications_rc[j] = applications_rc[n_apps - 1];
2038 GNUNET_array_grow (applications_rc, n_apps, n_apps - 1);
2044 GNUNET_free (c->apps);
2047 GNUNET_SCHEDULER_cancel (announce_applications_task);
2050 if (0 != c->type_counter)
2051 GNUNET_free (c->types);
2052 GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c);
2058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n");
2064 * Handler for new clients
2066 * @param cls closure
2067 * @param client identification of the client
2068 * @param message the actual message, which includes messages the client wants
2071 handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client,
2072 const struct GNUNET_MessageHeader *message)
2074 struct GNUNET_MESH_ClientConnect *cc_msg;
2075 struct MeshClient *c;
2083 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n");
2084 /* Check data sanity */
2085 size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect);
2086 cc_msg = (struct GNUNET_MESH_ClientConnect *) message;
2087 types = ntohs (cc_msg->types);
2088 apps = ntohs (cc_msg->applications);
2090 types * sizeof (uint16_t) + apps * sizeof (GNUNET_MESH_ApplicationType))
2093 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2097 /* Create new client structure */
2098 c = GNUNET_malloc (sizeof (struct MeshClient));
2102 c->type_counter = types;
2103 c->types = GNUNET_malloc (types * sizeof (uint16_t));
2104 memcpy (c->types, &message[1], types * sizeof (uint16_t));
2108 c->app_counter = apps;
2109 c->apps = GNUNET_malloc (apps * sizeof (GNUNET_MESH_ApplicationType));
2110 memcpy (c->apps, &message[1] + types * sizeof (uint16_t),
2111 apps * sizeof (GNUNET_MESH_ApplicationType));
2113 for (i = 0; i < apps; i++)
2116 for (j = 0; i < n_apps; j++)
2118 if (c->apps[i] == applications[j])
2121 applications_rc[j]++;
2127 /* Register previously unknown application */
2128 GNUNET_array_append (applications, n_apps, c->apps[i]);
2130 GNUNET_array_append (applications_rc, n_apps, 1);
2131 if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task)
2133 announce_applications_task =
2134 GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME,
2135 &announce_applications, NULL);
2139 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2140 "MESH: client has %u+%u subscriptions\n", c->type_counter,
2143 GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c);
2144 c->tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2145 GNUNET_SERVER_notification_context_add (nc, client);
2147 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2153 * Handler for requests of new tunnels
2155 * @param cls closure
2156 * @param client identification of the client
2157 * @param message the actual message
2160 handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client,
2161 const struct GNUNET_MessageHeader *message)
2163 struct GNUNET_MESH_TunnelMessage *t_msg;
2164 struct MeshTunnel *t;
2165 struct MeshClient *c;
2166 GNUNET_HashCode hash;
2168 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n");
2170 /* Sanity check for client registration */
2171 if (NULL == (c = retrieve_client (client)))
2174 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2178 /* Message sanity check */
2179 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2182 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2186 t_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2187 /* Sanity check for tunnel numbering */
2188 if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI))
2191 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2194 /* Sanity check for duplicate tunnel IDs */
2195 if (NULL != retrieve_tunnel_by_local_id (c, ntohl (t_msg->tunnel_id)))
2198 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2202 t = GNUNET_malloc (sizeof (struct MeshTunnel));
2203 while (NULL != retrieve_tunnel_by_pi (myid, next_tid))
2204 next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
2205 t->id.tid = next_tid++;
2207 t->local_tid = ntohl (t_msg->tunnel_id);
2209 t->peers = GNUNET_CONTAINER_multihashmap_create (32);
2211 GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash);
2213 GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t,
2214 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2217 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2221 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2223 GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t,
2224 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY))
2227 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2231 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2237 * Handler for requests of deleting tunnels
2239 * @param cls closure
2240 * @param client identification of the client
2241 * @param message the actual message
2244 handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client,
2245 const struct GNUNET_MessageHeader *message)
2247 struct GNUNET_MESH_TunnelMessage *tunnel_msg;
2248 struct MeshClient *c;
2249 struct MeshTunnel *t;
2250 MESH_TunnelNumber tid;
2251 GNUNET_HashCode hash;
2253 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n");
2255 /* Sanity check for client registration */
2256 if (NULL == (c = retrieve_client (client)))
2259 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2262 /* Message sanity check */
2263 if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size))
2266 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2270 tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message;
2272 /* Retrieve tunnel */
2273 tid = ntohl (tunnel_msg->tunnel_id);
2275 /* Remove from local id hashmap */
2276 GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash);
2277 t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash);
2278 GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t);
2280 /* Remove from global id hashmap */
2281 GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash);
2282 GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t);
2284 // notify_tunnel_destroy(t);
2285 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2291 * Handler for connection requests to new peers
2293 * @param cls closure
2294 * @param client identification of the client
2295 * @param message the actual message (PeerControl)
2298 handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client,
2299 const struct GNUNET_MessageHeader *message)
2301 struct GNUNET_MESH_PeerControl *peer_msg;
2302 struct MeshClient *c;
2303 struct MeshTunnel *t;
2304 MESH_TunnelNumber tid;
2305 struct MeshPeerInfo *peer_info;
2308 /* Sanity check for client registration */
2309 if (NULL == (c = retrieve_client (client)))
2312 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2316 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2317 /* Sanity check for message size */
2318 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2321 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2325 /* Tunnel exists? */
2326 tid = ntohl (peer_msg->tunnel_id);
2327 t = retrieve_tunnel_by_local_id (c, tid);
2331 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2335 /* Does client own tunnel? */
2336 if (t->client->handle != client)
2339 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2344 peer_info = get_peer_info (&peer_msg->peer);
2346 /* Start DHT search if needed */
2347 if (MESH_PEER_READY != peer_info->state && NULL == peer_info->dhtget)
2349 peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_ANY, &peer_msg->peer.hashPubKey, 4, /* replication level */
2350 GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */
2353 0, /* xquery bits */
2355 (void *) peer_info);
2358 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2364 * Handler for disconnection requests of peers in a tunnel
2366 * @param cls closure
2367 * @param client identification of the client
2368 * @param message the actual message (PeerControl)
2371 handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client,
2372 const struct GNUNET_MessageHeader *message)
2374 struct GNUNET_MESH_PeerControl *peer_msg;
2375 struct MeshClient *c;
2376 struct MeshTunnel *t;
2377 MESH_TunnelNumber tid;
2379 /* Sanity check for client registration */
2380 if (NULL == (c = retrieve_client (client)))
2383 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2386 peer_msg = (struct GNUNET_MESH_PeerControl *) message;
2387 /* Sanity check for message size */
2388 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size))
2391 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2395 /* Tunnel exists? */
2396 tid = ntohl (peer_msg->tunnel_id);
2397 t = retrieve_tunnel_by_local_id (c, tid);
2401 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2405 /* Does client own tunnel? */
2406 if (t->client->handle != client)
2409 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2413 /* Ok, delete peer from tunnel */
2414 GNUNET_CONTAINER_multihashmap_remove_all (t->peers,
2415 &peer_msg->peer.hashPubKey);
2417 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2423 * Handler for connection requests to new peers by type
2425 * @param cls closure
2426 * @param client identification of the client
2427 * @param message the actual message (ConnectPeerByType)
2430 handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client,
2431 const struct GNUNET_MessageHeader *message)
2433 struct GNUNET_MESH_ConnectPeerByType *connect_msg;
2434 struct MeshClient *c;
2435 struct MeshTunnel *t;
2436 GNUNET_HashCode hash;
2437 GNUNET_MESH_ApplicationType type;
2438 MESH_TunnelNumber tid;
2439 uint8_t buffer[12] = "MESH_APP";
2443 /* Sanity check for client registration */
2444 if (NULL == (c = retrieve_client (client)))
2447 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2451 connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message;
2452 /* Sanity check for message size */
2453 if (sizeof (struct GNUNET_MESH_PeerControl) !=
2454 ntohs (connect_msg->header.size))
2457 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2461 /* Tunnel exists? */
2462 tid = ntohl (connect_msg->tunnel_id);
2463 t = retrieve_tunnel_by_local_id (c, tid);
2467 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2471 /* Does client own tunnel? */
2472 if (t->client->handle != client)
2475 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2479 /* Do WE have the service? */
2480 type = ntohl (connect_msg->type);
2481 for (i = 0; i < n_apps; i++)
2483 if (applications[i] == type)
2485 /* Yes! Fast forward, add ourselves to the tunnel and send the
2486 * good news to the client
2488 struct GNUNET_MESH_PeerControl pc;
2490 GNUNET_PEER_resolve (myid, &pc.peer);
2491 GNUNET_CONTAINER_multihashmap_put (t->peers, &pc.peer.hashPubKey,
2492 get_peer_info (&pc.peer),
2493 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY);
2494 pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
2495 pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
2496 pc.tunnel_id = htonl (t->local_tid);
2497 GNUNET_SERVER_notification_context_unicast (nc, client, NULL, GNUNET_NO);
2500 /* Ok, lets find a peer offering the service */
2501 p = (uint32_t *) & buffer[8];
2502 *p = connect_msg->type; /* Already in Network Byte Order! */
2503 GNUNET_CRYPTO_hash (buffer, 12, &hash);
2504 if (c->dht_get_type)
2506 GNUNET_DHT_get_stop (c->dht_get_type);
2509 GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL,
2510 GNUNET_BLOCK_TYPE_ANY, &hash, 10U,
2511 GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, NULL, 0,
2512 &dht_get_type_handler, t);
2514 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2520 * Handler for client traffic directed to one peer
2522 * @param cls closure
2523 * @param client identification of the client
2524 * @param message the actual message
2527 handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client,
2528 const struct GNUNET_MessageHeader *message)
2530 struct MeshClient *c;
2531 struct MeshTunnel *t;
2532 struct MeshPeerInfo *pi;
2533 struct GNUNET_MESH_Unicast *data_msg;
2534 struct GNUNET_PeerIdentity next_hop;
2535 struct MeshDataDescriptor *info;
2536 MESH_TunnelNumber tid;
2539 /* Sanity check for client registration */
2540 if (NULL == (c = retrieve_client (client)))
2543 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2546 data_msg = (struct GNUNET_MESH_Unicast *) message;
2547 /* Sanity check for message size */
2548 if (sizeof (struct GNUNET_MESH_Unicast) +
2549 sizeof (struct GNUNET_MessageHeader) > ntohs (data_msg->header.size))
2552 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2556 /* Tunnel exists? */
2557 tid = ntohl (data_msg->tid);
2558 t = retrieve_tunnel_by_local_id (c, tid);
2562 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2566 /* Is it a local tunnel? Then, does client own the tunnel? */
2567 if (t->client->handle != NULL && t->client->handle != client)
2570 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2574 pi = GNUNET_CONTAINER_multihashmap_get (t->peers,
2575 &data_msg->destination.hashPubKey);
2576 /* Is the selected peer in the tunnel? */
2580 * Are we SO nice that we automatically try to add him to the tunnel?
2583 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2588 struct GNUNET_MESH_Unicast copy;
2590 memcpy (©, data_msg, sizeof (struct GNUNET_MESH_Unicast));
2592 handle_mesh_data_unicast (NULL, NULL, ©.header, NULL);
2595 GNUNET_PEER_resolve (get_first_hop (pi->path), &next_hop);
2596 data_size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Unicast);
2597 info = GNUNET_malloc (sizeof (struct MeshDataDescriptor) + data_size);
2598 memcpy (&info[1], &data_msg[1], data_size);
2599 info->destination = pi->id;
2600 info->origin = &t->id;
2601 info->size = data_size;
2602 info->client = client;
2603 GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0,
2604 GNUNET_TIME_UNIT_FOREVER_REL, &next_hop,
2605 /* FIXME re-check types */
2607 sizeof (struct GNUNET_MESH_Unicast),
2608 &send_core_data_unicast, info);
2613 * Handler for client traffic directed to all peers in a tunnel
2615 * @param cls closure
2616 * @param client identification of the client
2617 * @param message the actual message
2620 handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client,
2621 const struct GNUNET_MessageHeader *message)
2623 struct MeshClient *c;
2624 struct MeshTunnel *t;
2625 struct GNUNET_MESH_Multicast *data_msg;
2626 MESH_TunnelNumber tid;
2628 /* Sanity check for client registration */
2629 if (NULL == (c = retrieve_client (client)))
2632 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2635 data_msg = (struct GNUNET_MESH_Multicast *) message;
2636 /* Sanity check for message size */
2637 if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size))
2640 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2644 /* Tunnel exists? */
2645 tid = ntohl (data_msg->tid);
2646 t = retrieve_tunnel_by_local_id (c, tid);
2650 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2654 /* Does client own tunnel? */
2655 if (t->client->handle != client)
2658 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2664 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2669 * Functions to handle messages from clients
2671 static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
2672 {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0},
2673 {&handle_local_tunnel_create, NULL,
2674 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE,
2675 sizeof (struct GNUNET_MESH_TunnelMessage)},
2676 {&handle_local_tunnel_destroy, NULL,
2677 GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY,
2678 sizeof (struct GNUNET_MESH_TunnelMessage)},
2679 {&handle_local_connect_add, NULL,
2680 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD,
2681 sizeof (struct GNUNET_MESH_PeerControl)},
2682 {&handle_local_connect_del, NULL,
2683 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL,
2684 sizeof (struct GNUNET_MESH_PeerControl)},
2685 {&handle_local_connect_by_type, NULL,
2686 GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE,
2687 sizeof (struct GNUNET_MESH_ConnectPeerByType)},
2688 {&handle_local_unicast, NULL,
2689 GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0},
2690 {&handle_local_unicast, NULL,
2691 GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0},
2692 {&handle_local_multicast, NULL,
2693 GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0},
2699 * To be called on core init/fail.
2701 * @param cls service closure
2702 * @param server handle to the server for this service
2703 * @param identity the public identity of this peer
2704 * @param publicKey the public key of this peer
2707 core_init (void *cls, struct GNUNET_CORE_Handle *server,
2708 const struct GNUNET_PeerIdentity *identity,
2709 const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey)
2711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n");
2712 core_handle = server;
2713 myid = GNUNET_PEER_intern (identity);
2714 announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls);
2719 * Method called whenever a given peer connects.
2721 * @param cls closure
2722 * @param peer peer identity this notification is about
2723 * @param atsi performance data for the connection
2726 core_connect (void *cls, const struct GNUNET_PeerIdentity *peer,
2727 const struct GNUNET_TRANSPORT_ATS_Information *atsi)
2729 // GNUNET_PEER_Id pid;
2730 struct MeshPeerInfo *peer_info;
2731 struct MeshPath *path;
2733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n");
2734 peer_info = get_peer_info (peer);
2735 if (myid == peer_info->id)
2737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
2739 path = GNUNET_malloc (sizeof (struct MeshPath));
2741 path->peers = GNUNET_malloc (sizeof (GNUNET_PEER_Id) * 2);
2742 path->peers[0] = myid;
2743 path->peers[1] = peer_info->id;
2744 add_path_to_peer (peer_info, path);
2749 * Method called whenever a peer disconnects.
2751 * @param cls closure
2752 * @param peer peer identity this notification is about
2755 core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer)
2757 struct MeshPeerInfo *pi;
2760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n");
2761 pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey);
2767 for (i = 0; i < CORE_QUEUE_SIZE; i++)
2769 if (pi->core_transmit[i])
2771 GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]);
2772 /* TODO: notify that tranmission has failed */
2773 GNUNET_free (pi->infos[i]);
2778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n");
2784 /******************************************************************************/
2785 /************************ MAIN FUNCTIONS ****************************/
2786 /******************************************************************************/
2789 * Task run during shutdown.
2795 shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2797 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n");
2798 if (core_handle != NULL)
2800 GNUNET_CORE_disconnect (core_handle);
2803 if (dht_handle != NULL)
2805 GNUNET_DHT_disconnect (dht_handle);
2810 GNUNET_SERVER_notification_context_destroy (nc);
2813 if (0 != announce_id_task)
2815 GNUNET_SCHEDULER_cancel (announce_id_task);
2816 announce_id_task = 0;
2818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n");
2822 * Process mesh requests.
2824 * @param cls closure
2825 * @param server the initialized server
2826 * @param c configuration to use
2829 run (void *cls, struct GNUNET_SERVER_Handle *server,
2830 const struct GNUNET_CONFIGURATION_Handle *c)
2832 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n");
2833 GNUNET_SERVER_add_handlers (server, plugin_handlers);
2834 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
2835 server_handle = server;
2836 core_handle = GNUNET_CORE_connect (c, /* Main configuration */
2837 CORE_QUEUE_SIZE, /* queue size */
2838 NULL, /* Closure passed to MESH functions */
2839 &core_init, /* Call core_init once connected */
2840 &core_connect, /* Handle connects */
2841 &core_disconnect, /* remove peers on disconnects */
2842 NULL, /* Do we care about "status" updates? */
2843 NULL, /* Don't notify about all incoming messages */
2844 GNUNET_NO, /* For header only in notification */
2845 NULL, /* Don't notify about all outbound messages */
2846 GNUNET_NO, /* For header-only out notification */
2847 core_handlers); /* Register these handlers */
2848 if (core_handle == NULL)
2852 dht_handle = GNUNET_DHT_connect (c, 64);
2853 if (dht_handle == NULL)
2855 GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\
2856 Running without DHT has a severe\
2857 impact in MESH capabilities.\n\
2858 Plase check your configuretion and enable DHT.\n");
2864 tunnels = GNUNET_CONTAINER_multihashmap_create (32);
2865 peers = GNUNET_CONTAINER_multihashmap_create (32);
2866 nc = GNUNET_SERVER_notification_context_create (server_handle,
2869 clients_tail = NULL;
2871 applications = NULL;
2872 applications_rc = NULL;
2874 announce_applications_task = 0;
2876 /* Scheduled the task to clean up when shutdown is called */
2877 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task,
2880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n");
2884 * The main function for the mesh service.
2886 * @param argc number of arguments from the command line
2887 * @param argv command line arguments
2888 * @return 0 ok, 1 on error
2891 main (int argc, char *const *argv)
2895 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n");
2898 GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run,
2900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n");