/* This file is part of GNUnet. (C) 2001 - 2011 Christian Grothoff (and other contributing authors) GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /** * @file mesh/gnunet-service-mesh.c * @brief GNUnet MESH service * @author Bartlomiej Polot * * STRUCTURE: * - DATA STRUCTURES * - GLOBAL VARIABLES * - GENERAL HELPERS * - PERIODIC FUNCTIONS * - MESH NETWORK HANDLER HELPERS * - MESH NETWORK HANDLES * - MESH LOCAL HANDLER HELPERS * - MESH LOCAL HANDLES * - MAIN FUNCTIONS (main & run) * * TODO: * - error reporting (CREATE/CHANGE/ADD/DEL?) -- new message! * - partial disconnect reporting -- same as error reporting? * - add vs create? change vs. keep-alive? same msg or different ones? -- thinking... * - speed requirement specification (change?) in mesh API -- API call * - add ping message * - add connection confirmation message * - handle trnsmt_rdy return values */ #include "platform.h" #include "mesh.h" #include "mesh_protocol.h" #include "gnunet_dht_service.h" #include "mesh_tunnel_tree.h" /* TODO: move into configuration file */ #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\ GNUNET_TIME_UNIT_SECONDS,\ 300) #define APP_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\ GNUNET_TIME_UNIT_SECONDS,\ 5) #define ID_ANNOUNCE_TIME GNUNET_TIME_relative_multiply(\ GNUNET_TIME_UNIT_SECONDS,\ 10) /******************************************************************************/ /************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** FWD declaration */ struct MeshPeerInfo; /** * Struct containing all info possibly needed to build a package when called * back by core. */ struct MeshDataDescriptor { /** ID of the tunnel this packet travels in */ struct MESH_TunnelID *origin; /** Data itself */ void *data; /** Client that asked for the transmission, if any */ struct GNUNET_SERVER_Client *client; /** Who was this message being sent to */ struct MeshPeerInfo *peer; /** Ultimate destination of the packet */ GNUNET_PEER_Id destination; /** Number of identical messages sent to different hops (multicast) */ unsigned int *copies; /** Which handler was used to request the transmission */ unsigned int handler_n; /** Size of the data */ size_t size; }; /** * Struct containing all information regarding a given peer */ struct MeshPeerInfo { /** * ID of the peer */ GNUNET_PEER_Id id; /** * Last time we heard from this peer */ struct GNUNET_TIME_Absolute last_contact; /** * Number of attempts to reconnect so far */ int n_reconnect_attempts; /** * Paths to reach the peer, ordered by ascending hop count */ struct MeshPeerPath *path_head; /** * Paths to reach the peer, ordered by ascending hop count */ struct MeshPeerPath *path_tail; /** * Handle to stop the DHT search for a path to this peer */ struct GNUNET_DHT_GetHandle *dhtget; /** * Handles to stop queued transmissions for this peer */ struct GNUNET_CORE_TransmitHandle *core_transmit[CORE_QUEUE_SIZE]; /** * Pointer to info stuctures used as cls for queued transmissions */ struct MeshDataDescriptor *infos[CORE_QUEUE_SIZE]; /** * Array of tunnels this peer participates in * (most probably a small amount, therefore not a hashmap) * When the path to the peer changes, notify these tunnels to let them * re-adjust their path trees. */ struct MeshTunnel **tunnels; /** * Number of tunnels above */ unsigned int ntunnels; }; /** * Data scheduled to transmit (to local client or remote peer) */ struct MeshQueue { /** * Double linked list */ struct MeshQueue *next; struct MeshQueue *prev; /** * Target of the data (NULL if target is client) */ struct MeshPeerInfo *peer; /** * Client to send the data to (NULL if target is peer) */ struct MeshClient *client; /** * Size of the message to transmit */ unsigned int size; /** * How old is the data? */ struct GNUNET_TIME_Absolute timestamp; /** * Data itself */ struct GNUNET_MessageHeader *data; }; /** * Globally unique tunnel identification (owner + number) * DO NOT USE OVER THE NETWORK */ struct MESH_TunnelID { /** * Node that owns the tunnel */ GNUNET_PEER_Id oid; /** * Tunnel number to differentiate all the tunnels owned by the node oid * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI ) */ MESH_TunnelNumber tid; }; struct MeshClient; /* FWD declaration */ /** * Struct containing all information regarding a tunnel * For an intermediate node the improtant info used will be: * - id Tunnel unique identification * - paths[0] To know where to send it next * - metainfo: ready, speeds, accounting */ struct MeshTunnel { /** * Tunnel ID */ struct MESH_TunnelID id; /** * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 ) */ MESH_TunnelNumber local_tid; /** * Last time the tunnel was used */ struct GNUNET_TIME_Absolute timestamp; /** * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo) */ struct GNUNET_CONTAINER_MultiHashMap *peers; /** * Number of peers that are connected and potentially ready to receive data */ unsigned int peers_ready; /** * Number of peers that have been added to the tunnel */ unsigned int peers_total; /** * Client owner of the tunnel, if any */ struct MeshClient *client; /** * Messages ready to transmit */ struct MeshQueue *queue_head; struct MeshQueue *queue_tail; /** * Tunnel paths */ struct MeshTunnelTree *tree; /** * Task to keep the used paths alive */ GNUNET_SCHEDULER_TaskIdentifier path_refresh_task; }; /** * Info needed to work with tunnel paths and peers */ struct MeshPathInfo { /** * Tunnel */ struct MeshTunnel *t; /** * Destination peer */ struct MeshPeerInfo *peer; /** * Path itself */ struct MeshPeerPath *path; }; /** * Struct containing information about a client of the service */ struct MeshClient { /** * Linked list */ struct MeshClient *next; struct MeshClient *prev; /** * Tunnels that belong to this client, indexed by local id */ struct GNUNET_CONTAINER_MultiHashMap *tunnels; /** * Handle to communicate with the client */ struct GNUNET_SERVER_Client *handle; /** * Applications that this client has claimed to provide */ struct GNUNET_CONTAINER_MultiHashMap *apps; /** * Messages that this client has declared interest in */ struct GNUNET_CONTAINER_MultiHashMap *types; /** * Used to search peers offering a service */ struct GNUNET_DHT_GetHandle *dht_get_type; #if MESH_DEBUG /** * ID of the client, for debug messages */ unsigned int id; #endif }; /******************************************************************************/ /************************ DEBUG FUNCTIONS ****************************/ /******************************************************************************/ #if MESH_DEBUG /** * GNUNET_SCHEDULER_Task for printing a message after some operation is done * @param cls string to print * @param tc task context */ static void mesh_debug (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { char *s = cls; if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason) { return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", s); } #endif /******************************************************************************/ /*********************** GLOBAL VARIABLES ****************************/ /******************************************************************************/ /** * All the clients */ static struct MeshClient *clients; static struct MeshClient *clients_tail; /** * Tunnels known, indexed by MESH_TunnelID (MeshTunnel) */ static struct GNUNET_CONTAINER_MultiHashMap *tunnels; /** * Peers known, indexed by PeerIdentity (MeshPeerInfo) */ static struct GNUNET_CONTAINER_MultiHashMap *peers; /** * Handle to communicate with core */ static struct GNUNET_CORE_Handle *core_handle; /** * Handle to use DHT */ static struct GNUNET_DHT_Handle *dht_handle; /** * Handle to server */ static struct GNUNET_SERVER_Handle *server_handle; /** * Notification context, to send messages to local clients */ static struct GNUNET_SERVER_NotificationContext *nc; /** * Local peer own ID (memory efficient handle) */ static GNUNET_PEER_Id myid; /** * Local peer own ID (full value) */ static struct GNUNET_PeerIdentity my_full_id; /** * Own private key */ static struct GNUNET_CRYPTO_RsaPrivateKey* my_private_key; /** * Own public key. */ static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key; /** * Tunnel ID for the next created tunnel (global tunnel number) */ static MESH_TunnelNumber next_tid; /** * All application types provided by this peer */ static struct GNUNET_CONTAINER_MultiHashMap *applications; /** * All message types clients of this peer are interested in */ static struct GNUNET_CONTAINER_MultiHashMap *types; /** * Task to periodically announce provided applications */ GNUNET_SCHEDULER_TaskIdentifier announce_applications_task; /** * Task to periodically announce itself in the network */ GNUNET_SCHEDULER_TaskIdentifier announce_id_task; #if MESH_DEBUG unsigned int next_client_id; #endif /******************************************************************************/ /************************ ITERATORS ****************************/ /******************************************************************************/ /* FIXME move iterators here */ /******************************************************************************/ /************************ PERIODIC FUNCTIONS ****************************/ /******************************************************************************/ /** * Announce iterator over for each application provided by the peer * * @param cls closure * @param key current key code * @param value value in the hash map * @return GNUNET_YES if we should continue to * iterate, * GNUNET_NO if not. */ static int announce_application (void *cls, const GNUNET_HashCode * key, void *value) { /* FIXME are hashes in multihash map equal on all aquitectures? */ GNUNET_DHT_put (dht_handle, key, 10U, GNUNET_DHT_RO_RECORD_ROUTE, GNUNET_BLOCK_TYPE_TEST, sizeof (struct GNUNET_PeerIdentity), (const char *) &my_full_id, #if MESH_DEBUG GNUNET_TIME_UNIT_FOREVER_ABS, GNUNET_TIME_UNIT_FOREVER_REL, &mesh_debug, "DHT_put for app completed"); #else GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), APP_ANNOUNCE_TIME), APP_ANNOUNCE_TIME, NULL, NULL); #endif return GNUNET_OK; } /** * Periodically announce what applications are provided by local clients * * @param cls closure * @param tc task context */ static void announce_applications (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN) { announce_applications_task = GNUNET_SCHEDULER_NO_TASK; return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Starting PUT for apps\n"); GNUNET_CONTAINER_multihashmap_iterate (applications, &announce_application, NULL); announce_applications_task = GNUNET_SCHEDULER_add_delayed (APP_ANNOUNCE_TIME, &announce_applications, cls); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Finished PUT for apps\n"); return; } /** * Periodically announce self id in the DHT * * @param cls closure * @param tc task context */ static void announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN) { announce_id_task = GNUNET_SCHEDULER_NO_TASK; return; } /* TODO * - Set data expiration in function of X * - Adapt X to churn */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DHT_put for ID %s started.\n", GNUNET_h2s_full (&my_full_id.hashPubKey)); GNUNET_DHT_put (dht_handle, /* DHT handle */ &my_full_id.hashPubKey, /* Key to use */ 10U, /* Replication level */ GNUNET_DHT_RO_RECORD_ROUTE, /* DHT options */ GNUNET_BLOCK_TYPE_TEST, /* Block type */ sizeof(my_full_id), /* Size of the data */ (char *)&my_full_id, /* Data itself */ GNUNET_TIME_absolute_get_forever (), /* Data expiration */ GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */ #if MESH_DEBUG &mesh_debug, "DHT_put for id completed"); #else NULL, /* Continuation */ NULL); /* Continuation closure */ #endif announce_id_task = GNUNET_SCHEDULER_add_delayed (ID_ANNOUNCE_TIME, &announce_id, cls); } /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data */ static void dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, const GNUNET_HashCode * key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data); /******************************************************************************/ /****************** GENERAL HELPER FUNCTIONS ************************/ /******************************************************************************/ /** * Retrieve the MeshPeerInfo stucture associated with the peer, create one * and insert it in the appropiate structures if the peer is not known yet. * * @param peer Identity of the peer * * @return Existing or newly created peer info */ static struct MeshPeerInfo * peer_info_get (const struct GNUNET_PeerIdentity *peer) { struct MeshPeerInfo *peer_info; peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); if (NULL == peer_info) { peer_info = (struct MeshPeerInfo *) GNUNET_malloc (sizeof (struct MeshPeerInfo)); GNUNET_CONTAINER_multihashmap_put (peers, &peer->hashPubKey, peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); peer_info->id = GNUNET_PEER_intern (peer); } return peer_info; } #if LATER /** * Destroy the peer_info and free any allocated resources linked to it * @param t tunnel the path belongs to * @param pi the peer_info to destroy * @return GNUNET_OK on success */ static int peer_info_destroy (struct MeshPeerInfo *pi) { GNUNET_HashCode hash; struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (pi->id, &id); GNUNET_PEER_change_rc (pi->id, -1); GNUNET_CRYPTO_hash (&id, sizeof (struct GNUNET_PeerIdentity), &hash); GNUNET_CONTAINER_multihashmap_remove (peers, &hash, pi); GNUNET_SCHEDULER_cancel (pi->path_refresh_task); GNUNET_free (pi); return GNUNET_OK; } #endif /** * Notify a tunnel that a connection has broken that affects at least * some of its peers. * * @param t Tunnel affected. * @param peer Peer that (at least) has been affected by the disconnection. * @param p1 Peer that got disconnected from p2. * @param p2 Peer that got disconnected from p1. * * @return Short ID of the peer disconnected (either p1 or p2). * 0 if the tunnel remained unaffected. */ static GNUNET_PEER_Id tunnel_notify_connection_broken (struct MeshTunnel *t, struct MeshPeerInfo *peer, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2); /** * Remove all paths that rely on a direct connection between p1 and p2 * from the peer itself and notify all tunnels about it. * * @param peer PeerInfo of affected peer. * @param p1 GNUNET_PEER_Id of one peer. * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and * no longer is. * * TODO: optimize (see below) */ static void path_remove_from_peer (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { struct GNUNET_PeerIdentity id; struct MeshPeerPath *p; struct MeshPeerPath *aux; struct MeshPeerInfo *peer_d; GNUNET_PEER_Id d; unsigned int destroyed; unsigned int best; unsigned int cost; unsigned int i; destroyed = 0; p = peer->path_head; while (NULL != p) { aux = p->next; for (i = 0; i < (p->length - 1); i++) { if ((p->peers[i] == p1 && p->peers[i + 1] == p2) || (p->peers[i] == p2 && p->peers[i + 1] == p1)) { path_destroy (p); destroyed++; break; } } p = aux; } if (0 == destroyed) return; for (i = 0; i < peer->ntunnels; i++) { d = tunnel_notify_connection_broken (peer->tunnels[i], peer, p1, p2); /* TODO * Problem: one or more peers have been deleted from the tunnel tree. * We don't know who they are to try to add them again. * We need to try to find a new path for each of the disconnected peers. * Some of them might already have a path to reach them that does not * involve p1 and p2. Adding all anew might render in a better tree than * the trivial immediate fix. * * Trivial immiediate fix: try to reconnect to the disconnected node. All * its children will be reachable trough him. */ GNUNET_PEER_resolve(d, &id); peer_d = peer_info_get(&id); best = UINT_MAX; aux = NULL; for (p = peer_d->path_head; NULL != p; p = p->next) { if ((cost = path_get_cost(peer->tunnels[i]->tree, p)) < best) { best = cost; aux = p; } } if (NULL != aux) { /* No callback, as peer will be already disconnected */ tree_add_path(peer->tunnels[i]->tree, aux, NULL); } else { struct MeshPathInfo *path_info; if (NULL != peer_d->dhtget) return; path_info = GNUNET_malloc(sizeof(struct MeshPathInfo)); path_info->path = p; path_info->peer = peer_d; path_info->t = peer->tunnels[i]; peer_d->dhtget = GNUNET_DHT_get_start(dht_handle, /* handle */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ GNUNET_BLOCK_TYPE_TEST, /* type */ &id.hashPubKey, /*key to search */ 4, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* xquery */ 0, /* xquery bits */ &dht_get_id_handler, (void *) path_info); } } } /** * Add the path to the peer and update the path used to reach it in case this * is the shortest. * * @param peer_info Destination peer to add the path to. * @param path New path to add. Last peer must be the peer in arg 1. * Path will be either used of freed if already known. * * TODO: trim the part from origin to us? Add it as path to origin? */ void path_add_to_peer (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path) { struct MeshPeerPath *aux; unsigned int l; unsigned int l2; if (NULL == peer_info || NULL == path) { GNUNET_break (0); return; } l = path_get_length (path); for (aux = peer_info->path_head; aux != NULL; aux = aux->next) { l2 = path_get_length (aux); if (l2 > l) { GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head, peer_info->path_tail, aux, path); } else { if (l2 == l && memcmp(path->peers, aux->peers, l) == 0) { path_destroy(path); return; } } } GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail, path); return; } /** * Add the path to the origin peer and update the path used to reach it in case * this is the shortest. * The path is given in peer_info -> destination, therefore we turn the path * upside down first. * * @param peer_info Peer to add the path to, being the origin of the path. * @param path New path to add after being inversed. */ static void path_add_to_origin (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path) { path_invert(path); path_add_to_peer (peer_info, path); } /** * Build a PeerPath from the paths returned from the DHT, reversing the paths * to obtain a local peer -> destination path and interning the peer ids. * * @return Newly allocated and created path */ static struct MeshPeerPath * path_build_from_dht (const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length) { struct MeshPeerPath *p; GNUNET_PEER_Id id; int i; p = path_new (0); i = get_path_length; GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: GET has %d hops.\n", i); for (i--; i >= 0; i--) { id = GNUNET_PEER_intern (&get_path[i]); if (p->length > 0 && id == p->peers[p->length - 1]) { GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc(id, -1); } else { p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1)); p->peers[p->length] = id; p->length++; } } i = put_path_length; GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: PUT has %d hops.\n", i); for (i--; i >= 0; i--) { id = GNUNET_PEER_intern (&put_path[i]); if (p->length > 0 && id == p->peers[p->length - 1]) { GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc(id, -1); } else { p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * (p->length + 1)); p->peers[p->length] = id; p->length++; } } #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of GET: %s)\n", GNUNET_h2s_full(&get_path[0].hashPubKey)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (first of PUT: %s)\n", GNUNET_h2s_full(&put_path[0].hashPubKey)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: In total: %d hops\n", p->length); #endif return p; } /** * Send keepalive packets for a peer * * @param cls Closure (tunnel for which to send the keepalive). * @param tc Notification context. * * TODO: implement explicit multicast keepalive? */ void path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * Check if client has registered with the service and has not disconnected * * @param client the client to check * * @return non-NULL if client exists in the global DLL */ static struct MeshClient * client_get (struct GNUNET_SERVER_Client *client) { struct MeshClient *c; c = clients; while (NULL != c) { if (c->handle == client) return c; c = c->next; } return NULL; } /** * Checks if a given client has subscribed to certain message type * * @param message_type Type of message to check * @param c Client to check * * @return GNUNET_YES or GNUNET_NO, depending on subscription status * * TODO inline? */ static int client_is_subscribed (uint16_t message_type, struct MeshClient *c) { GNUNET_HashCode hc; GNUNET_CRYPTO_hash (&message_type, sizeof (uint16_t), &hc); return GNUNET_CONTAINER_multihashmap_contains (c->types, &hc); } /** * Search for a tunnel among the tunnels for a client * * @param c the client whose tunnels to search in * @param tid the local id of the tunnel * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid) { GNUNET_HashCode hash; GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); return GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash); } /** * Search for a tunnel by global ID using PEER_ID * * @param pi owner of the tunnel * @param tid global tunnel number * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid) { struct MESH_TunnelID id; GNUNET_HashCode hash; id.oid = pi; id.tid = tid; GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash); return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash); } /** * Search for a tunnel by global ID using full PeerIdentities * * @param oid owner of the tunnel * @param tid global tunnel number * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid) { return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid); } /** * Callback used to notify a client owner of a tunnel that a peer has * disconnected, most likely because of a path change. * * @param n Node in the tree representing the disconnected peer */ void notify_peer_disconnected (const struct MeshTunnelTreeNode *n) { struct GNUNET_MESH_PeerControl msg; if (NULL == n->t->client || NULL == nc) return; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); msg.tunnel_id = htonl (n->t->local_tid); GNUNET_PEER_resolve (n->peer, &msg.peer); GNUNET_SERVER_notification_context_unicast (nc, n->t->client->handle, &msg.header, GNUNET_NO); } /** * Add a peer to a tunnel, accomodating paths accordingly and initializing all * needed rescources. * * @param t Tunnel we want to add a new peer to * @param peer PeerInfo of the peer being added * */ static void tunnel_add_peer (struct MeshTunnel *t, struct MeshPeerInfo *peer) { struct MeshPeerPath *p; struct MeshPeerPath *best_p; unsigned int best_cost; unsigned int cost; if (NULL != tree_find_peer(t->tree->root, peer->id)) { /* Already have it, nothing to do. */ return; } t->peers_total++; GNUNET_array_append (peer->tunnels, peer->ntunnels, t); if (NULL == (p = peer->path_head)) { GNUNET_break (0); return; } best_p = p; best_cost = UINT_MAX; while (NULL != p) { if ((cost = path_get_cost (t->tree, p)) < best_cost) { best_cost = cost; best_p = p; } p = p->next; } tree_add_path (t->tree, best_p, ¬ify_peer_disconnected); if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task) t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (t->tree->refresh, &path_refresh, t); } /** * Notify a tunnel that a connection has broken that affects at least * some of its peers. * * @param t Tunnel affected. * @param peer Peer that (at least) has been affected by the disconnection. * @param p1 Peer that got disconnected from p2. * @param p2 Peer that got disconnected from p1. * * @return Short ID of the peer disconnected (either p1 or p2). * 0 if the tunnel remained unaffected. */ static GNUNET_PEER_Id tunnel_notify_connection_broken (struct MeshTunnel *t, struct MeshPeerInfo *peer, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { return tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected); } /** * Destroy the tunnel and free any allocated resources linked to it * * @param t the tunnel to destroy * * @return GNUNET_OK on success */ static int tunnel_destroy (struct MeshTunnel *t) { struct MeshClient *c; struct MeshQueue *q; struct MeshQueue *qn; GNUNET_HashCode hash; int r; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: DESTROYING TUNNEL at %p\n", t); if (NULL == t) return GNUNET_OK; c = t->client; #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id); #endif GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash); if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_CONTAINER_multihashmap_destroy (t->peers); q = t->queue_head; while (NULL != q) { if (NULL != q->data) GNUNET_free (q->data); qn = q->next; GNUNET_free (q); q = qn; /* TODO cancel core transmit ready in case it was active */ } tree_destroy(t->tree); GNUNET_free (t); return r; } /** * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a * client when the client disconnects. * * @param cls closure (client that is disconnecting) * @param key the hash of the local tunnel id (used to access the hashmap) * @param value the value stored at the key (tunnel to destroy) * * @return GNUNET_OK on success */ static int tunnel_destroy_iterator (void *cls, const GNUNET_HashCode * key, void *value) { int r; r = tunnel_destroy ((struct MeshTunnel *) value); return r; } /******************************************************************************/ /**************** MESH NETWORK HANDLER HELPERS ***********************/ /******************************************************************************/ /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_create_path (void *cls, size_t size, void *buf) { struct MeshPathInfo *info = cls; struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *peer_ptr; struct MeshPeerInfo *peer = info->peer; struct MeshTunnel *t = info->t; struct MeshPeerPath *p = info->path; size_t size_needed; int i; size_needed = sizeof (struct GNUNET_MESH_ManipulatePath) + p->length * sizeof (struct GNUNET_PeerIdentity); if (size < size_needed || NULL == buf) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Retransmitting create path\n"); GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, path_get_first_hop (t->tree, peer->id), size_needed, &send_core_create_path, info); return 0; } msg = (struct GNUNET_MESH_ManipulatePath *) buf; msg->header.size = htons (size_needed); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE); msg->tid = ntohl (t->id.tid); peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1]; for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve (p->peers[i], peer_ptr++); } path_destroy (p); GNUNET_free (info); return size_needed; } #if LATER /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (MeshDataDescriptor with all info to build packet) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_data_to_origin (void *cls, size_t size, void *buf) { struct MeshDataDescriptor *info = cls; struct GNUNET_MESH_ToOrigin *msg = buf; size_t total_size; GNUNET_assert (NULL != info); total_size = sizeof (struct GNUNET_MESH_ToOrigin) + info->size; GNUNET_assert (total_size < 65536); /* UNIT16_MAX */ if (total_size > size) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "not enough buffer to send data to origin\n"); return 0; } msg->header.size = htons (total_size); msg->header.type = htons (GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN); GNUNET_PEER_resolve (info->origin->oid, &msg->oid); msg->tid = htonl (info->origin->tid); if (0 != info->size) { memcpy (&msg[1], &info[1], info->size); } if (NULL != info->client) { GNUNET_SERVER_receive_done (info->client, GNUNET_OK); } GNUNET_free (info); return total_size; } #endif /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (data itself) * @param size number of bytes available in buf * @param buf where the callee should write the message * * @return number of bytes written to buf */ static size_t send_core_data_multicast (void *cls, size_t size, void *buf) { struct MeshDataDescriptor *info = cls; struct GNUNET_MESH_Multicast *msg = buf; size_t total_size; GNUNET_assert (NULL != info); GNUNET_assert (NULL != info->peer); total_size = info->size + sizeof (struct GNUNET_MESH_Multicast); GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE); if (total_size > size) { /* Retry */ struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve(info->peer->id, &id); info->peer->infos[info->handler_n] = info; info->peer->core_transmit[info->handler_n] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, total_size, &send_core_data_multicast, info); return 0; } info->peer->core_transmit[info->handler_n] = NULL; info->peer->infos[info->handler_n] = NULL; msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST); msg->header.size = htons (total_size); GNUNET_PEER_resolve (info->origin->oid, &msg->oid); msg->tid = htonl (info->origin->tid); memcpy (&msg[1], info->data, info->size); if (0 == --(*info->copies)) { if (NULL != info->client) { /* FIXME One unresponsive neighbor (who doesn't "call" tmt_rdy) can lock * the client from sending anything else to the service. * - Call receive_done after certain timeout. * - Here cancel the timeout. */ GNUNET_SERVER_receive_done (info->client, GNUNET_OK); } GNUNET_free (info->data); GNUNET_free (info->copies); } GNUNET_free (info); return total_size; } /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (MeshDataDescriptor) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_path_ack (void *cls, size_t size, void *buf) { struct MeshDataDescriptor *info = cls; struct GNUNET_MESH_PathACK *msg = buf; GNUNET_assert (NULL != info); if (info->peer) { info->peer->core_transmit[info->handler_n] = NULL; } if (sizeof (struct GNUNET_MESH_PathACK) > size) { GNUNET_break (0); return 0; } msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK)); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK); GNUNET_PEER_resolve (info->origin->oid, &msg->oid); msg->tid = htonl (info->origin->tid); msg->peer_id = my_full_id; GNUNET_free (info); /* TODO add signature */ return sizeof (struct GNUNET_MESH_PathACK); } /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (data itself) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_data_raw (void *cls, size_t size, void *buf) { struct GNUNET_MessageHeader *msg = cls; size_t total_size; GNUNET_assert (NULL != msg); total_size = ntohs (msg->size); if (total_size > size) { GNUNET_break (0); return 0; } memcpy (buf, msg, total_size); GNUNET_free (cls); return total_size; } #if LATER /** * Send another peer a notification to destroy a tunnel * @param cls The tunnel to destroy * @param size Size in the buffer * @param buf Memory where to put the data to transmit * @return Size of data put in buffer */ static size_t send_p2p_tunnel_destroy (void *cls, size_t size, void *buf) { struct MeshTunnel *t = cls; struct MeshClient *c; struct GNUNET_MESH_TunnelMessage *msg; c = t->client; msg = buf; msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); /*FIXME*/ msg->header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg->tunnel_id = htonl (t->id.tid); tunnel_destroy (c, t); return sizeof (struct GNUNET_MESH_TunnelMessage); } #endif /** * Send the message to all clients that have subscribed to its type * * @param msg Pointer to the message itself * @return number of clients this message was sent to */ static unsigned int send_subscribed_clients (struct GNUNET_MessageHeader *msg) { struct MeshClient *c; unsigned int count; uint16_t type; type = ntohs (msg->type); for (count = 0, c = clients; c != NULL; c = c->next) { if (client_is_subscribed (type, c)) { count++; GNUNET_SERVER_notification_context_unicast (nc, c->handle, msg, GNUNET_YES); } } return count; } /** * Notify the client that owns the tunnel that a peer has connected to it * * @param t Tunnel whose owner to notify * @param id Short id of the peer that has connected */ static void send_client_peer_connected (const struct MeshTunnel *t, const GNUNET_PEER_Id id) { struct GNUNET_MESH_PeerControl pc; pc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD); pc.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); pc.tunnel_id = htonl (t->local_tid); GNUNET_PEER_resolve (id, &pc.peer); GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, &pc.header, GNUNET_NO); } /******************************************************************************/ /******************** MESH NETWORK HANDLERS **************************/ /******************************************************************************/ /** * Core handler for path creation * struct GNUNET_CORE_MessageHandler * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) * */ static int handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { unsigned int own_pos; uint16_t size; uint16_t i; MESH_TunnelNumber tid; struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *pi; struct GNUNET_PeerIdentity id; GNUNET_HashCode hash; struct MeshPeerPath *path; struct MeshPeerInfo *dest_peer_info; struct MeshPeerInfo *orig_peer_info; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Received a MESH path create msg\n"); size = ntohs (message->size); if (size < sizeof (struct GNUNET_MESH_ManipulatePath)) { GNUNET_break_op (0); return GNUNET_OK; } size -= sizeof (struct GNUNET_MESH_ManipulatePath); if (size % sizeof (struct GNUNET_PeerIdentity)) { GNUNET_break_op (0); return GNUNET_OK; } size /= sizeof (struct GNUNET_PeerIdentity); if (size < 2) { GNUNET_break_op (0); return GNUNET_OK; } msg = (struct GNUNET_MESH_ManipulatePath *) message; tid = ntohl (msg->tid); pi = (struct GNUNET_PeerIdentity *) &msg[1]; t = tunnel_get (pi, tid); if (NULL == t) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Creating tunnel\n"); t = GNUNET_malloc (sizeof (struct MeshTunnel)); t->id.oid = GNUNET_PEER_intern (pi); t->id.tid = tid; t->peers = GNUNET_CONTAINER_multihashmap_create (32); GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_break (0); return GNUNET_OK; } } dest_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey); if (NULL == dest_peer_info) { dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo)); dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]); GNUNET_CONTAINER_multihashmap_put (peers, &pi[size - 1].hashPubKey, dest_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } orig_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi->hashPubKey); if (NULL == orig_peer_info) { orig_peer_info = GNUNET_malloc (sizeof (struct MeshPeerInfo)); orig_peer_info->id = GNUNET_PEER_intern (pi); GNUNET_CONTAINER_multihashmap_put (peers, &pi->hashPubKey, orig_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } path = path_new (size); own_pos = 0; for (i = 0; i < size; i++) { path->peers[i] = GNUNET_PEER_intern (&pi[i]); if (path->peers[i] == myid) own_pos = i; } if (own_pos == 0) { /* cannot be self, must be 'not found' */ /* create path: self not found in path through self */ GNUNET_break_op (0); path_destroy (path); /* FIXME error. destroy tunnel? leave for timeout? */ return 0; } if (own_pos == size - 1) { /* It is for us! Send ack. */ struct MeshDataDescriptor *info; unsigned int j; path_add_to_origin (orig_peer_info, path); /* inverts path! */ info = GNUNET_malloc (sizeof (struct MeshDataDescriptor)); info->origin = &t->id; info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &id.hashPubKey); GNUNET_assert (info->peer); for (j = 0; info->peer->core_transmit[j]; j++) { if (j == 9) { GNUNET_break (0); return GNUNET_OK; } } info->handler_n = j; info->peer->core_transmit[j] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100, GNUNET_TIME_UNIT_FOREVER_REL, peer, sizeof (struct GNUNET_MessageHeader), &send_core_path_ack, info); } else { /* It's for somebody else! Retransmit. */ struct MeshPathInfo *path_info; path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info->t = t; path_info->path = path; path_info->peer = dest_peer_info; path_add_to_peer (dest_peer_info, path); GNUNET_PEER_resolve (path->peers[own_pos + 1], &id); GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, sizeof (struct GNUNET_MessageHeader), &send_core_create_path, path_info); } return GNUNET_OK; } /** * Core handler for mesh network traffic going from the origin to a peer * * @param cls closure * @param peer peer identity this notification is about * @param message message * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_Unicast *msg; struct MeshTunnel *t; struct MeshPeerInfo *pi; size_t size; size = ntohs (message->size); if (size < sizeof (struct GNUNET_MESH_Unicast) + sizeof (struct GNUNET_MessageHeader)) { GNUNET_break (0); return GNUNET_OK; } msg = (struct GNUNET_MESH_Unicast *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify back: we don't know this tunnel */ GNUNET_break_op (0); return GNUNET_OK; } pi = GNUNET_CONTAINER_multihashmap_get (t->peers, &msg->destination.hashPubKey); if (NULL == pi) { /* TODO maybe feedback, log to statistics */ GNUNET_break_op (0); return GNUNET_OK; } if (pi->id == myid) { send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]); return GNUNET_OK; } msg = GNUNET_malloc (size); memcpy (msg, message, size); GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, path_get_first_hop (t->tree, pi->id), size, &send_core_data_raw, msg); return GNUNET_OK; } /** * Core handler for mesh network traffic going from the origin to all peers * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) * * TODO: Check who we got this from, to validate route. */ static int handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_Multicast *msg; struct GNUNET_PeerIdentity *id; struct MeshDataDescriptor *info; struct MeshTunnelTreeNode *n; struct MeshTunnel *t; unsigned int *copies; unsigned int i; size_t size; void *data; size = ntohs (message->size) - sizeof (struct GNUNET_MESH_Multicast); if (size < sizeof (struct GNUNET_MessageHeader)) { GNUNET_break_op (0); return GNUNET_OK; } msg = (struct GNUNET_MESH_Multicast *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know that tunnel */ GNUNET_break_op (0); return GNUNET_OK; } /* Transmit to locally interested clients */ if (GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey)) { send_subscribed_clients ((struct GNUNET_MessageHeader *) &msg[1]); } n = t->tree->me->children_head; if (NULL == n) return GNUNET_OK; copies = GNUNET_malloc (sizeof (unsigned int)); for (*copies = 0; NULL != n; n = n->next) (*copies)++; n = t->tree->me->children_head; data = GNUNET_malloc (size); memcpy (data, &msg[1], size); while (NULL != n) { info = GNUNET_malloc (sizeof (struct MeshDataDescriptor)); info->origin = &t->id; info->data = data; info->size = size; info->copies = copies; info->client = t->client->handle; info->destination = n->peer; id = path_get_first_hop(t->tree, n->peer); info->peer = peer_info_get(id); GNUNET_assert (NULL != info->peer); for (i = 0; NULL != info->peer->core_transmit[i]; i++) { if (i == (CORE_QUEUE_SIZE - 1)) { GNUNET_break (0); return GNUNET_OK; } } info->handler_n = i; info->peer->infos[i] = info; info->peer->core_transmit[i] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, id, ntohs (msg->header.size), &send_core_data_multicast, info); } return GNUNET_OK; } /** * Core handler for mesh network traffic * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_ToOrigin *msg; struct GNUNET_PeerIdentity id; struct MeshPeerInfo *peer_info; struct MeshTunnel *t; size_t size; size = ntohs (message->size); if (size < sizeof (struct GNUNET_MESH_ToOrigin) + /* Payload must be */ sizeof (struct GNUNET_MessageHeader)) /* at least a header */ { GNUNET_break_op (0); return GNUNET_OK; } msg = (struct GNUNET_MESH_ToOrigin *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know this tunnel (whom)? */ return GNUNET_OK; } if (t->id.oid == myid) { if (NULL == t->client) { /* got data packet for ownerless tunnel */ GNUNET_break_op (0); return GNUNET_OK; } /* TODO signature verification */ GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, message, GNUNET_YES); return GNUNET_OK; } peer_info = peer_info_get (&msg->oid); if (NULL == peer_info) { /* unknown origin of tunnel */ GNUNET_break (0); return GNUNET_OK; } GNUNET_PEER_resolve (t->tree->me->parent->peer, &id); msg = GNUNET_malloc (size); memcpy (msg, message, size); GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, size, &send_core_data_raw, msg); return GNUNET_OK; } /** * Core handler for path ACKs * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_PathACK *msg; struct MeshTunnelTreeNode *n; struct MeshPeerInfo *peer_info; struct MeshTunnel *t; msg = (struct GNUNET_MESH_PathACK *) message; t = tunnel_get (&msg->oid, msg->tid); if (NULL == t) { /* TODO notify that we don't know the tunnel */ return GNUNET_OK; } /* Message for us? */ if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity))) { if (NULL == t->client) { GNUNET_break_op (0); return GNUNET_OK; } peer_info = peer_info_get (&msg->peer_id); if (NULL == peer_info) { GNUNET_break_op (0); return GNUNET_OK; } n = tree_find_peer(t->tree->root, peer_info->id); if (NULL == n) { GNUNET_break_op (0); return GNUNET_OK; } n->status = MESH_PEER_READY; send_client_peer_connected(t, peer_info->id); return GNUNET_OK; } peer_info = peer_info_get (&msg->oid); if (NULL == peer_info) { /* If we know the tunnel, we should DEFINITELY know the peer */ GNUNET_break (0); return GNUNET_OK; } msg = GNUNET_malloc (sizeof (struct GNUNET_MESH_PathACK)); memcpy (msg, message, sizeof (struct GNUNET_MESH_PathACK)); GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, path_get_first_hop (t->tree, peer_info->id), sizeof (struct GNUNET_MESH_PathACK), &send_core_data_raw, msg); return GNUNET_OK; } /** * Functions to handle messages from core */ static struct GNUNET_CORE_MessageHandler core_handlers[] = { {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0}, {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0}, {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0}, {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0}, {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, sizeof (struct GNUNET_MESH_PathACK)}, {NULL, 0, 0} }; /******************************************************************************/ /**************** MESH LOCAL HANDLER HELPERS ***********************/ /******************************************************************************/ /** * deregister_app: iterator for removing each application registered by a client * * @param cls closure * @param key the hash of the application id (used to access the hashmap) * @param value the value stored at the key (client) * * @return GNUNET_OK on success */ static int deregister_app (void *cls, const GNUNET_HashCode * key, void *value) { GNUNET_CONTAINER_multihashmap_remove (applications, key, value); return GNUNET_OK; } #if LATER /** * notify_client_connection_failure: notify a client that the connection to the * requested remote peer is not possible (for instance, no route found) * Function called when the socket is ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for writing in the meantime. * * @param cls closure * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t notify_client_connection_failure (void *cls, size_t size, void *buf) { int size_needed; struct MeshPeerInfo *peer_info; struct GNUNET_MESH_PeerControl *msg; struct GNUNET_PeerIdentity id; if (0 == size && NULL == buf) { // TODO retry? cancel? return 0; } size_needed = sizeof (struct GNUNET_MESH_PeerControl); peer_info = (struct MeshPeerInfo *) cls; msg = (struct GNUNET_MESH_PeerControl *) buf; msg->header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DISCONNECTED); // msg->tunnel_id = htonl(peer_info->t->tid); GNUNET_PEER_resolve (peer_info->id, &id); memcpy (&msg->peer, &id, sizeof (struct GNUNET_PeerIdentity)); return size_needed; } #endif /** * Send keepalive packets for a peer * * @param cls Closure (tunnel for which to send the keepalive). * @param tc Notification context. * * TODO: implement explicit multicast keepalive? */ void path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; struct GNUNET_MessageHeader *payload; struct GNUNET_MESH_Multicast *msg; size_t size; t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK; if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN) { return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: sending keepalive for tunnel %d\n", t->id.tid); size = sizeof(struct GNUNET_MESH_Multicast) + sizeof(struct GNUNET_MessageHeader); msg = GNUNET_malloc (size); msg->header.size = htons (size); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST); msg->oid = my_full_id; msg->tid = htonl(t->id.tid); payload = (struct GNUNET_MessageHeader *) &msg[1]; payload->size = htons (sizeof(struct GNUNET_MessageHeader)); payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE); handle_mesh_data_multicast (NULL, &my_full_id, &msg->header, NULL); GNUNET_free (msg); t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (t->tree->refresh, &path_refresh, t); return; } /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data * * TODO: re-issue the request after certain time? cancel after X results? */ static void dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, const GNUNET_HashCode * key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data) { struct MeshPathInfo *path_info = cls; struct MeshPathInfo *path_info_aux; struct MeshPeerPath *p; struct MeshPeerPath *aux; struct GNUNET_PeerIdentity pi; int i; GNUNET_PEER_resolve (path_info->peer->id, &pi); GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Got results from DHT for %s\n", GNUNET_h2s_full(&pi.hashPubKey)); if (NULL == get_path || NULL == put_path) { if (NULL == path_info->peer->path_head) { // Find ourselves some alternate initial path to the destination: retry GNUNET_DHT_get_stop (path_info->peer->dhtget); path_info->peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ GNUNET_BLOCK_TYPE_TEST, /* type */ &pi.hashPubKey, /*key to search */ 4, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* xquery */ 0, /* xquery bits */ &dht_get_id_handler, (void *) path_info); return; } } p = path_build_from_dht (get_path, get_path_length, put_path, put_path_length); path_add_to_peer (path_info->peer, p); for (i = 0; i < path_info->peer->ntunnels; i++) { tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer); aux = tree_get_path_to_peer(path_info->peer->tunnels[i]->tree, path_info->peer->id); if (aux->length > 1) { struct GNUNET_PeerIdentity id; path_info_aux = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info_aux->path = aux; path_info_aux->peer = path_info->peer; path_info_aux->t = path_info->t; GNUNET_PEER_resolve (p->peers[1], &id); GNUNET_CORE_notify_transmit_ready (core_handle, /* handle */ 0, /* cork */ 0, /* priority */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ &id, /* target */ sizeof (struct GNUNET_MESH_ManipulatePath) + (aux->length * sizeof (struct GNUNET_PeerIdentity)), /*size */ &send_core_create_path, /* callback */ path_info_aux); /* cls */ } else { send_client_peer_connected(path_info->t, myid); } } GNUNET_free (path_info); return; } /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data */ static void dht_get_type_handler (void *cls, struct GNUNET_TIME_Absolute exp, const GNUNET_HashCode * key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data) { const struct GNUNET_PeerIdentity *pi = data; struct GNUNET_PeerIdentity id; struct MeshTunnel *t = cls; struct MeshPeerInfo *peer_info; struct MeshPathInfo *path_info; struct MeshPeerPath *p; int i; if (size != sizeof (struct GNUNET_PeerIdentity)) { GNUNET_break_op (0); return; } GNUNET_assert (NULL != t->client); GNUNET_DHT_get_stop (t->client->dht_get_type); t->client->dht_get_type = NULL; peer_info = peer_info_get (pi); GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path_head && NULL == peer_info->dhtget) { path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info->peer = peer_info; path_info->t = t; /* we don't have a route to the peer, let's try a direct lookup */ peer_info->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ GNUNET_BLOCK_TYPE_TEST, /* block type */ &pi->hashPubKey, /* key to look up */ 10U, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, /* option to dht: record route */ NULL, /* xquery */ 0, /* xquery bits */ dht_get_id_handler, /* callback */ path_info); /* closure */ return; } p = path_build_from_dht (get_path, get_path_length, put_path, put_path_length); path_add_to_peer (peer_info, p); tunnel_add_peer(t, peer_info); p = tree_get_path_to_peer(t->tree, peer_info->id); #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new route for tunnel 0x%x found, has %u hops\n", t->local_tid, p->length); for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve (p->peers[0], &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH:\t%d\t%s\n", i, GNUNET_h2s_full (&id.hashPubKey)); } #endif if (p->length > 1) { path_info = GNUNET_malloc(sizeof(struct MeshPathInfo)); path_info->t = t; path_info->peer = peer_info; path_info->path = p; GNUNET_PEER_resolve (p->peers[1], &id); GNUNET_CORE_notify_transmit_ready (core_handle, /* handle */ 0, /* cork */ 0, /* priority */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ &id, /* target */ sizeof (struct GNUNET_MESH_ManipulatePath) + (p->length * sizeof (struct GNUNET_PeerIdentity)), /*size */ &send_core_create_path, /* callback */ path_info); /* cls */ return; } path_destroy(p); send_client_peer_connected(t, myid); } /******************************************************************************/ /********************* MESH LOCAL HANDLES **************************/ /******************************************************************************/ /** * Handler for client disconnection * * @param cls closure * @param client identification of the client; NULL * for the last call when the server is destroyed */ static void handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client) { struct MeshClient *c; struct MeshClient *next; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client disconnected\n"); if (client == NULL) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (SERVER DOWN)\n"); c = clients; while (NULL != c) { if (c->handle != client && NULL != client) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: ... searching\n"); c = c->next; continue; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: matching client found\n"); if (NULL != c->tunnels) { GNUNET_CONTAINER_multihashmap_iterate (c->tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap_destroy (c->tunnels); } /* deregister clients applications */ if (NULL != c->apps) { GNUNET_CONTAINER_multihashmap_iterate (c->apps, &deregister_app, NULL); GNUNET_CONTAINER_multihashmap_destroy (c->apps); } if (0 == GNUNET_CONTAINER_multihashmap_size (applications) && GNUNET_SCHEDULER_NO_TASK != announce_applications_task) { GNUNET_SCHEDULER_cancel (announce_applications_task); announce_applications_task = GNUNET_SCHEDULER_NO_TASK; } if (NULL != c->types) GNUNET_CONTAINER_multihashmap_destroy (c->types); if (NULL != c->dht_get_type) GNUNET_DHT_get_stop (c->dht_get_type); GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c); next = c->next; GNUNET_free (c); c = next; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: done!\n"); return; } /** * Handler for new clients * * @param cls closure * @param client identification of the client * @param message the actual message, which includes messages the client wants */ static void handle_local_new_client (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_ClientConnect *cc_msg; struct MeshClient *c; GNUNET_MESH_ApplicationType *a; unsigned int size; uint16_t ntypes; uint16_t *t; uint16_t napps; uint16_t i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client connected\n"); /* Check data sanity */ size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect); cc_msg = (struct GNUNET_MESH_ClientConnect *) message; ntypes = ntohs (cc_msg->types); napps = ntohs (cc_msg->applications); if (size != ntypes * sizeof (uint16_t) + napps * sizeof (GNUNET_MESH_ApplicationType)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Create new client structure */ c = GNUNET_malloc (sizeof (struct MeshClient)); #if MESH_DEBUG c->id = next_client_id++; #endif c->handle = client; a = (GNUNET_MESH_ApplicationType *) &cc_msg[1]; if (napps > 0) { GNUNET_MESH_ApplicationType at; GNUNET_HashCode hc; c->apps = GNUNET_CONTAINER_multihashmap_create (napps); for (i = 0; i < napps; i++) { at = ntohl (a[i]); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: app type: %u\n", at); GNUNET_CRYPTO_hash (&at, sizeof (at), &hc); /* store in clients hashmap */ GNUNET_CONTAINER_multihashmap_put (c->apps, &hc, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); /* store in global hashmap, for announcements */ GNUNET_CONTAINER_multihashmap_put (applications, &hc, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); } if (GNUNET_SCHEDULER_NO_TASK == announce_applications_task) announce_applications_task = GNUNET_SCHEDULER_add_now (&announce_applications, NULL); } if (ntypes > 0) { uint16_t u16; GNUNET_HashCode hc; t = (uint16_t *) & a[napps]; c->types = GNUNET_CONTAINER_multihashmap_create (ntypes); for (i = 0; i < ntypes; i++) { u16 = ntohs (t[i]); GNUNET_CRYPTO_hash (&u16, sizeof (u16), &hc); /* store in clients hashmap */ GNUNET_CONTAINER_multihashmap_put (c->types, &hc, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); /* store in global hashmap */ GNUNET_CONTAINER_multihashmap_put (types, &hc, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); } } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: client has %u+%u subscriptions\n", napps, ntypes); GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c); c->tunnels = GNUNET_CONTAINER_multihashmap_create (32); GNUNET_SERVER_notification_context_add (nc, client); GNUNET_SERVER_receive_done (client, GNUNET_OK); #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new client processed\n"); #endif } /** * Handler for requests of new tunnels * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelMessage *t_msg; struct MeshTunnel *t; struct MeshClient *c; GNUNET_HashCode hash; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: new tunnel requested\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id); #endif /* Message sanity check */ if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } t_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Sanity check for tunnel numbering */ if (0 == (ntohl (t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Sanity check for duplicate tunnel IDs */ if (NULL != tunnel_get_by_local_id (c, ntohl (t_msg->tunnel_id))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } t = GNUNET_malloc (sizeof (struct MeshTunnel)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: CREATED TUNNEL at %p\n", t); while (NULL != tunnel_get_by_pi (myid, next_tid)) next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; t->id.tid = next_tid++; t->id.oid = myid; t->local_tid = ntohl (t_msg->tunnel_id); t->client = c; t->peers = GNUNET_CONTAINER_multihashmap_create (32); GNUNET_CRYPTO_hash (&t->local_tid, sizeof (MESH_TunnelNumber), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (c->tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } t->tree = tree_new (t, myid); t->tree->refresh = REFRESH_PATH_TIME; t->tree->root->status = MESH_PEER_READY; t->tree->me = t->tree->root; GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for requests of deleting tunnels * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelMessage *tunnel_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; GNUNET_HashCode hash; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: destroying tunnel\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Message sanity check */ if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: by client %u\n", c->id); #endif tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Retrieve tunnel */ tid = ntohl (tunnel_msg->tunnel_id); /* Remove from local id hashmap */ GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); t = GNUNET_CONTAINER_multihashmap_get (c->tunnels, &hash); GNUNET_CONTAINER_multihashmap_remove (c->tunnels, &hash, t); /* Remove from global id hashmap */ GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t); // notify_tunnel_destroy(t); FIXME tunnel_destroy(t); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for connection requests to new peers * * @param cls closure * @param client identification of the client * @param message the actual message (PeerControl) */ static void handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PeerControl *peer_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; struct MeshPeerInfo *peer_info; GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: Got connection request\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } peer_msg = (struct GNUNET_MESH_PeerControl *) message; /* Sanity check for message size */ if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (peer_msg->tunnel_id); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "MESH: for %s\n", GNUNET_h2s_full(&peer_msg->peer.hashPubKey)); peer_info = peer_info_get (&peer_msg->peer); /* Start DHT search if needed, otherwise just add peer to tunnel. */ if (NULL == peer_info->dhtget && NULL == peer_info->path_head) { struct MeshPathInfo *path_info; path_info = GNUNET_malloc(sizeof(struct MeshPathInfo)); path_info->peer = peer_info; path_info->t = t; peer_info->dhtget = GNUNET_DHT_get_start(dht_handle, /* handle */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ GNUNET_BLOCK_TYPE_TEST, /* type */ &peer_msg->peer.hashPubKey, /*key to search */ 4, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* xquery */ 0, /* xquery bits */ &dht_get_id_handler, (void *) path_info); } if (NULL != peer_info->path_head) { tunnel_add_peer(t, peer_info); } GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for disconnection requests of peers in a tunnel * * @param cls closure * @param client identification of the client * @param message the actual message (PeerControl) */ static void handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PeerControl *peer_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } peer_msg = (struct GNUNET_MESH_PeerControl *) message; /* Sanity check for message size */ if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (peer_msg->header.size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (peer_msg->tunnel_id); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Ok, delete peer from tunnel */ GNUNET_CONTAINER_multihashmap_remove_all (t->peers, &peer_msg->peer.hashPubKey); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for connection requests to new peers by type * * @param cls closure * @param client identification of the client * @param message the actual message (ConnectPeerByType) */ static void handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_ConnectPeerByType *connect_msg; struct MeshClient *c; struct MeshTunnel *t; GNUNET_HashCode hash; GNUNET_MESH_ApplicationType type; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: got connect by type request\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } connect_msg = (struct GNUNET_MESH_ConnectPeerByType *) message; /* Sanity check for message size */ if (sizeof (struct GNUNET_MESH_ConnectPeerByType) != ntohs (connect_msg->header.size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (connect_msg->tunnel_id); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Do WE have the service? */ type = ntohl (connect_msg->type); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: type requested: %u\n", type); GNUNET_CRYPTO_hash (&type, sizeof (GNUNET_MESH_ApplicationType), &hash); if (GNUNET_CONTAINER_multihashmap_contains (applications, &hash) == GNUNET_YES) { /* Yes! Fast forward, add ourselves to the tunnel and send the * good news to the client */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: available locally\n"); GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey, peer_info_get (&my_full_id), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: notifying client\n"); send_client_peer_connected(t, myid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Done\n"); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /* Ok, lets find a peer offering the service */ if (c->dht_get_type) { GNUNET_DHT_get_stop (c->dht_get_type); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: looking in DHT for %s\n", GNUNET_h2s_full (&hash)); c->dht_get_type = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_TEST, &hash, 10U, GNUNET_DHT_RO_RECORD_ROUTE, NULL, 0, &dht_get_type_handler, t); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for client traffic directed to one peer * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_unicast (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct MeshClient *c; struct MeshTunnel *t; struct MeshPeerInfo *pi; struct GNUNET_MESH_Unicast *data_msg; MESH_TunnelNumber tid; size_t size; /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } data_msg = (struct GNUNET_MESH_Unicast *) message; /* Sanity check for message size */ size = ntohs (message->size); if (sizeof (struct GNUNET_MESH_Unicast) + sizeof (struct GNUNET_MessageHeader) > size) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (data_msg->tid); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Is it a local tunnel? Then, does client own the tunnel? */ if (t->client->handle != NULL && t->client->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } pi = GNUNET_CONTAINER_multihashmap_get (t->peers, &data_msg->destination.hashPubKey); /* Is the selected peer in the tunnel? */ if (NULL == pi) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Ok, everything is correct, send the message * (pretend we got it from a mesh peer) */ { char buf[ntohs (message->size)]; struct GNUNET_MESH_Unicast *copy; /* Work around const limitation */ copy = (struct GNUNET_MESH_Unicast *) buf; memcpy (buf, data_msg, size); copy->oid = my_full_id; copy->tid = htonl (t->id.tid); handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL); } GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for client traffic directed to all peers in a tunnel * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_multicast (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct MeshClient *c; struct MeshTunnel *t; struct GNUNET_MESH_Multicast *data_msg; MESH_TunnelNumber tid; /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } data_msg = (struct GNUNET_MESH_Multicast *) message; /* Sanity check for message size */ if (sizeof (struct GNUNET_MESH_PeerControl) != ntohs (data_msg->header.size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (data_msg->tid); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } { char buf[ntohs(message->size)]; struct GNUNET_MESH_Multicast *copy; copy = (struct GNUNET_MESH_Multicast *)buf; memcpy(buf, message, ntohs(message->size)); copy->oid = my_full_id; copy->tid = htonl(t->id.tid); handle_mesh_data_multicast(client, &my_full_id, ©->header, NULL); } /* receive done gets called when last copy is sent */ return; } /** * Functions to handle messages from clients */ static struct GNUNET_SERVER_MessageHandler client_handlers[] = { {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0}, {&handle_local_tunnel_create, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE, sizeof (struct GNUNET_MESH_TunnelMessage)}, {&handle_local_tunnel_destroy, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY, sizeof (struct GNUNET_MESH_TunnelMessage)}, {&handle_local_connect_add, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD, sizeof (struct GNUNET_MESH_PeerControl)}, {&handle_local_connect_del, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL, sizeof (struct GNUNET_MESH_PeerControl)}, {&handle_local_connect_by_type, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE, sizeof (struct GNUNET_MESH_ConnectPeerByType)}, {&handle_local_unicast, NULL, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0}, {&handle_local_unicast, NULL, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0}, {&handle_local_multicast, NULL, GNUNET_MESSAGE_TYPE_MESH_MULTICAST, 0}, {NULL, NULL, 0, 0} }; /** * To be called on core init/fail. * * @param cls service closure * @param server handle to the server for this service * @param identity the public identity of this peer * @param publicKey the public key of this peer */ static void core_init (void *cls, struct GNUNET_CORE_Handle *server, const struct GNUNET_PeerIdentity *identity, const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Core init\n"); core_handle = server; if (0 != memcmp(identity, &my_full_id, sizeof(my_full_id)) || NULL == server) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, _("MESH: Wrong CORE service\n")); GNUNET_SCHEDULER_shutdown(); } return; } /** * Method called whenever a given peer connects. * * @param cls closure * @param peer peer identity this notification is about * @param atsi performance data for the connection */ static void core_connect (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct MeshPeerInfo *peer_info; struct MeshPeerPath *path; // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer connected\n"); // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", // GNUNET_h2s(&my_full_id.hashPubKey)); peer_info = peer_info_get (peer); if (myid == peer_info->id) { // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n"); return; } else { // GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: %s\n", // GNUNET_h2s(&peer->hashPubKey)); } path = path_new (2); path->peers[0] = myid; path->peers[1] = peer_info->id; path_add_to_peer (peer_info, path); return; } /** * Method called whenever a peer disconnects. * * @param cls closure * @param peer peer identity this notification is about */ static void core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer) { struct MeshPeerInfo *pi; unsigned int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: Peer disconnected\n"); pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); if (!pi) { GNUNET_break (0); return; } for (i = 0; i < CORE_QUEUE_SIZE; i++) { if (pi->core_transmit[i]) { GNUNET_CORE_notify_transmit_ready_cancel (pi->core_transmit[i]); /* TODO: notify that tranmission has failed */ GNUNET_free (pi->infos[i]); } } path_remove_from_peer (pi, pi->id, myid); if (myid == pi->id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: (self)\n"); } return; } /******************************************************************************/ /************************ MAIN FUNCTIONS ****************************/ /******************************************************************************/ /** * Task run during shutdown. * * @param cls unused * @param tc unused */ static void shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshClient *c; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shutting down\n"); if (core_handle != NULL) { GNUNET_CORE_disconnect (core_handle); core_handle = NULL; } if (dht_handle != NULL) { for (c = clients; NULL != c; c = c->next) if (NULL != c->dht_get_type) GNUNET_DHT_get_stop (c->dht_get_type); GNUNET_DHT_disconnect (dht_handle); dht_handle = NULL; } if (nc != NULL) { GNUNET_SERVER_notification_context_destroy (nc); nc = NULL; } if (GNUNET_SCHEDULER_NO_TASK != announce_id_task) { GNUNET_SCHEDULER_cancel (announce_id_task); announce_id_task = GNUNET_SCHEDULER_NO_TASK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: shut down\n"); } /** * Process mesh requests. * * @param cls closure * @param server the initialized server * @param c configuration to use */ static void run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *c) { struct MeshPeerInfo *peer; struct MeshPeerPath *p; char *keyfile; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: starting to run\n"); server_handle = server; core_handle = GNUNET_CORE_connect (c, /* Main configuration */ CORE_QUEUE_SIZE, /* queue size */ NULL, /* Closure passed to MESH functions */ &core_init, /* Call core_init once connected */ &core_connect, /* Handle connects */ &core_disconnect, /* remove peers on disconnects */ NULL, /* Do we care about "status" updates? */ NULL, /* Don't notify about all incoming messages */ GNUNET_NO, /* For header only in notification */ NULL, /* Don't notify about all outbound messages */ GNUNET_NO, /* For header-only out notification */ core_handlers); /* Register these handlers */ if (core_handle == NULL) { GNUNET_break (0); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (c, "GNUNETD", "HOSTKEY", &keyfile)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("Mesh service is lacking key configuration settings. Exiting.\n")); GNUNET_SCHEDULER_shutdown (); return; } my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile); GNUNET_free (keyfile); if (my_private_key == NULL) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Mesh service could not access hostkey. Exiting.\n")); GNUNET_SCHEDULER_shutdown (); return; } GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key); GNUNET_CRYPTO_hash (&my_public_key, sizeof (my_public_key), &my_full_id.hashPubKey); myid = GNUNET_PEER_intern (&my_full_id); dht_handle = GNUNET_DHT_connect (c, 64); if (dht_handle == NULL) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Error connecting to DHT.\ Running without DHT has a severe\ impact in MESH capabilities.\n\ Plase check your configuretion and enable DHT.\n"); GNUNET_break (0); } next_tid = 0; tunnels = GNUNET_CONTAINER_multihashmap_create (32); peers = GNUNET_CONTAINER_multihashmap_create (32); applications = GNUNET_CONTAINER_multihashmap_create (32); types = GNUNET_CONTAINER_multihashmap_create (32); GNUNET_SERVER_add_handlers (server_handle, client_handlers); nc = GNUNET_SERVER_notification_context_create (server_handle, LOCAL_QUEUE_SIZE); GNUNET_SERVER_disconnect_notify (server_handle, &handle_local_client_disconnect, NULL); clients = NULL; clients_tail = NULL; #if MESH_DEBUG next_client_id = 0; #endif announce_applications_task = GNUNET_SCHEDULER_NO_TASK; announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls); /* Create a peer_info for the local peer */ peer = peer_info_get(&my_full_id); p = path_new (1); p->peers[0] = myid; path_add_to_peer(peer, p); /* Scheduled the task to clean up when shutdown is called */ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, NULL); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: end of run()\n"); } /** * The main function for the mesh service. * * @param argc number of arguments from the command line * @param argv command line arguments * @return 0 ok, 1 on error */ int main (int argc, char *const *argv) { int ret; #if MESH_DEBUG // fprintf (stderr, "main ()\n"); #endif GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main()\n"); ret = (GNUNET_OK == GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "MESH: main() END\n"); #if MESH_DEBUG // fprintf (stderr, "main () END\n"); #endif return ret; }