/* 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 * - relay corking down to core * - set ttl relative to tree depth * TODO END */ #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,\ 5) #define UNACKNOWLEDGED_WAIT GNUNET_TIME_relative_multiply(\ GNUNET_TIME_UNIT_SECONDS,\ 2) #define DEFAULT_TTL 64 /* TODO END */ #define MESH_DEBUG_DHT GNUNET_YES #define MESH_DEBUG_CONNECTION GNUNET_NO #if MESH_DEBUG_CONNECTION #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) #else #define DEBUG_CONN(...) #endif #if MESH_DEBUG_DHT #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) #else #define DEBUG_DHT(...) #endif /******************************************************************************/ /************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** FWD declaration */ struct MeshPeerInfo; /** * Struct representing a piece of data being sent to other peers */ struct MeshData { /** Tunnel it belongs to. */ struct MeshTunnel *t; /** In case of a multicast, task to allow a client to send more data if * some neighbor is too slow. */ GNUNET_SCHEDULER_TaskIdentifier *task; /** How many remaining neighbors we need to send this to. */ unsigned int *reference_counter; /** Size of the data. */ size_t data_len; /** Data itself */ void *data; }; /** * Struct containing all info possibly needed to build a package when called * back by core. */ struct MeshTransmissionDescriptor { /** ID of the tunnel this packet travels in */ struct MESH_TunnelID *origin; /** Who was this message being sent to */ struct MeshPeerInfo *peer; /** Ultimate destination of the packet */ GNUNET_PEER_Id destination; /** Which handler was used to request the transmission */ unsigned int handler_n; /** Data descriptor */ struct MeshData* mesh_data; }; /** * 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; /** * Closure given to the DHT GET */ struct MeshPathInfo *dhtgetcls; /** * 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 */ void *infos[CORE_QUEUE_SIZE]; /** * Type of message being in each transmission */ uint16_t types[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 this peers participates in */ 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; /** * Local tunnel number for local destination clients (incoming number) * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same * number. */ MESH_TunnelNumber local_tid_dest; /** * ID of the last multicast packet seen/sent. */ uint32_t mid; /** * Last time the tunnel was used */ struct GNUNET_TIME_Absolute timestamp; /** * Peers in the tunnel, indexed by PeerIdentity -> (MeshPeerInfo) * containing peers added by id or by type, not intermediate peers. */ 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 *owner; /** * Clients that have been informed about the tunnel, if any */ struct MeshClient **clients; /** * Number of elements in clients */ unsigned int nclients; /** * Clients that have requested to leave the tunnel */ struct MeshClient **ignore; /** * Number of elements in clients */ unsigned int nignore; /** * Messages ready to transmit */ struct MeshQueue *queue_head; struct MeshQueue *queue_tail; /** * Tunnel paths */ struct MeshTunnelTree *tree; /** * Application type we are looking for in this tunnel */ GNUNET_MESH_ApplicationType type; /** * Used to search peers offering a service */ struct GNUNET_DHT_GetHandle *dht_get_type; /** * Task to keep the used paths alive */ GNUNET_SCHEDULER_TaskIdentifier path_refresh_task; /** * Task to destroy the tunnel after timeout * * FIXME: merge the two? a tunnel will have either * a path refresh OR a timeout, never both! */ GNUNET_SCHEDULER_TaskIdentifier timeout_task; }; /** * Info needed to work with tunnel paths and peers */ struct MeshPathInfo { /** * Tunnel */ struct MeshTunnel *t; /** * Neighbouring peer to whom we send the packet to */ struct MeshPeerInfo *peer; /** * Path itself */ struct MeshPeerPath *path; /** * Position in peer's transmit queue */ unsigned int pos; }; /** * Struct containing information about a client of the service */ struct MeshClient { /** * Linked list next */ struct MeshClient *next; /** * Linked list prev */ struct MeshClient *prev; /** * Tunnels that belong to this client, indexed by local id */ struct GNUNET_CONTAINER_MultiHashMap *own_tunnels; /** * Tunnels this client has accepted, indexed by incoming local id */ struct GNUNET_CONTAINER_MultiHashMap *incoming_tunnels; /** * Tunnels this client has rejected, indexed by incoming local id */ struct GNUNET_CONTAINER_MultiHashMap *ignore_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; /** * Whether the client is active or shutting down (don't send confirmations * to a client that is shutting down. */ int shutting_down; /** * ID of the client, mainly for debug messages */ unsigned int id; }; /******************************************************************************/ /************************ DEBUG FUNCTIONS ****************************/ /******************************************************************************/ #if MESH_DEBUG /** * GNUNET_SCHEDULER_Task for printing a message after some operation is done * @param cls string to print * @param success GNUNET_OK if the PUT was transmitted, * GNUNET_NO on timeout, * GNUNET_SYSERR on disconnect from service * after the PUT message was transmitted * (so we don't know if it was received or not) */ #if 0 static void mesh_debug (void *cls, int success) { char *s = cls; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success); } #endif #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; /** * Tunnels incoming, indexed by MESH_TunnelNumber * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) */ static struct GNUNET_CONTAINER_MultiHashMap *incoming_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 communicate with transport */ // static struct GNUNET_TRANSPORT_Handle *transport_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; /** * Tunnel ID for the next incoming tunnel (local tunnel number) */ static MESH_TunnelNumber next_local_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; /** * Next ID to assign to a client */ unsigned int next_client_id; /******************************************************************************/ /************************ 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? */ /* FIXME: keep return value of 'put' to possibly cancel!? */ GNUNET_DHT_put (dht_handle, key, 10, GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, GNUNET_BLOCK_TYPE_TEST, sizeof (struct GNUNET_PeerIdentity), (const char *) &my_full_id, GNUNET_TIME_absolute_add (GNUNET_TIME_absolute_get (), APP_ANNOUNCE_TIME), APP_ANNOUNCE_TIME, NULL, NULL); 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; } DEBUG_DHT ("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); DEBUG_DHT ("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 */ DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id)); GNUNET_DHT_put (dht_handle, /* DHT handle */ &my_full_id.hashPubKey, /* Key to use */ 10, /* Replication level */ GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* 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 */ NULL, /* Continuation */ NULL); /* Continuation closure */ 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 ************************/ /******************************************************************************/ /** * 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); /** * Delete an active client from the tunnel. * * @param t Tunnel. * @param c Client. */ static void tunnel_delete_active_client (struct MeshTunnel *t, const struct MeshClient *c); /** * Notify a tunnel that a connection has broken that affects at least * some of its peers. * * @param t Tunnel affected. * @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, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2); /** * 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); } /** * Allow a client to send more data after transmitting a multicast message * which some neighbor has not yet accepted altough a reasonable time has * passed. * * @param cls Closure (DataDescriptor containing the task identifier) * @param tc Task Context * * FIXME reference counter cshould be just int */ static void client_allow_send (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshData *mdata = cls; if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason) return; GNUNET_assert (NULL != mdata->reference_counter); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CLIENT ALLOW SEND DESPITE %u COPIES PENDING\n", *(mdata->reference_counter)); *(mdata->task) = GNUNET_SCHEDULER_NO_TASK; GNUNET_SERVER_receive_done (mdata->t->owner->handle, GNUNET_OK); } /** * Check whether client wants traffic from a tunnel. * * @param c Client to check. * @param t Tunnel to be found. * * @return GNUNET_YES if client knows tunnel. * * TODO look in client hashmap */ static int client_wants_tunnel (struct MeshClient *c, struct MeshTunnel *t) { unsigned int i; for (i = 0; i < t->nclients; i++) if (t->clients[i] == c) return GNUNET_YES; return GNUNET_NO; } /** * Check whether client has been informed about a tunnel. * * @param c Client to check. * @param t Tunnel to be found. * * @return GNUNET_YES if client knows tunnel. * * TODO look in client hashmap */ static int client_knows_tunnel (struct MeshClient *c, struct MeshTunnel *t) { unsigned int i; for (i = 0; i < t->nignore; i++) if (t->ignore[i] == c) return GNUNET_YES; return client_wants_tunnel(c, t); } /** * Marks a client as uninterested in traffic from the tunnel, updating both * client and tunnel to reflect this. * * @param c Client that doesn't want traffic anymore. * @param t Tunnel which should be ignored. * * FIXME when to delete an incoming tunnel? */ static void client_ignore_tunnel (struct MeshClient *c, struct MeshTunnel *t) { GNUNET_HashCode hash; GNUNET_CRYPTO_hash(&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); GNUNET_break (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t)); GNUNET_break (GNUNET_YES == GNUNET_CONTAINER_multihashmap_put (c->ignore_tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); tunnel_delete_active_client (t, c); GNUNET_array_append (t->ignore, t->nignore, c); } /** * Deletes a tunnel from a client (either owner or destination). To be used on * tunnel destroy, otherwise, use client_ignore_tunnel. * * @param c Client whose tunnel to delete. * @param t Tunnel which should be deleted. */ static void client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t) { GNUNET_HashCode hash; if (c == t->owner) { GNUNET_CRYPTO_hash(&t->local_tid, sizeof (MESH_TunnelNumber), &hash); GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, &hash, t)); } else { GNUNET_CRYPTO_hash(&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); // FIXME XOR? GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t) || GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (c->ignore_tunnels, &hash, t)); } } /** * Send the message to all clients that have subscribed to its type * * @param msg Pointer to the message itself * @param payload Pointer to the payload of the message. * @return number of clients this message was sent to */ static unsigned int send_subscribed_clients (const struct GNUNET_MessageHeader *msg, const struct GNUNET_MessageHeader *payload) { struct GNUNET_PeerIdentity *oid; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber *tid; unsigned int count; uint16_t type; char cbuf[htons (msg->size)]; type = ntohs (payload->type); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending to clients...\n"); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "message of type %u\n", type); memcpy (cbuf, msg, sizeof (cbuf)); switch (htons (msg->type)) { struct GNUNET_MESH_Unicast *uc; struct GNUNET_MESH_Multicast *mc; struct GNUNET_MESH_ToOrigin *to; case GNUNET_MESSAGE_TYPE_MESH_UNICAST: uc = (struct GNUNET_MESH_Unicast *) cbuf; tid = &uc->tid; oid = &uc->oid; break; case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: mc = (struct GNUNET_MESH_Multicast *) cbuf; tid = &mc->tid; oid = &mc->oid; break; case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: to = (struct GNUNET_MESH_ToOrigin *) cbuf; tid = &to->tid; oid = &to->oid; break; default: GNUNET_break (0); return 0; } t = tunnel_get (oid, ntohl (*tid)); if (NULL == t) { GNUNET_break (0); return 0; } for (count = 0, c = clients; c != NULL; c = c->next) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client %u\n", c->id); if (client_is_subscribed (type, c)) { if (htons (msg->type) == GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN) { if (c != t->owner) continue; *tid = htonl (t->local_tid); } else { if (GNUNET_NO == client_knows_tunnel (c, t)) { /* This client doesn't know the tunnel */ struct GNUNET_MESH_TunnelNotification tmsg; GNUNET_HashCode hash; tmsg.header.size = htons (sizeof (tmsg)); tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); GNUNET_PEER_resolve (t->id.oid, &tmsg.peer); tmsg.tunnel_id = htonl (t->local_tid_dest); GNUNET_SERVER_notification_context_unicast (nc, c->handle, &tmsg.header, GNUNET_NO); GNUNET_array_append (t->clients, t->nclients, c); GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); GNUNET_break (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put ( c->incoming_tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); } *tid = htonl (t->local_tid_dest); } /* Check if the client wants to get traffic from the tunnel */ if (GNUNET_NO == client_wants_tunnel(c, t)) continue; count++; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending\n"); GNUNET_SERVER_notification_context_unicast (nc, c->handle, (struct GNUNET_MessageHeader *) cbuf, GNUNET_YES); } } return count; } /** * Notify the client that owns the tunnel that a peer has connected to it * (the requested path to it has been confirmed). * * @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->owner->handle, &pc.header, GNUNET_NO); } /** * Notify all clients (not depending on registration status) that the incoming * tunnel is no longer valid. * * @param t Tunnel that was destroyed. */ static void send_clients_tunnel_destroy (struct MeshTunnel *t) { struct GNUNET_MESH_TunnelMessage msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); msg.tunnel_id = htonl (t->local_tid_dest); GNUNET_SERVER_notification_context_broadcast (nc, &msg.header, GNUNET_NO); } /** * Notify clients of tunnel disconnections, if needed. * In case the origin disconnects, the destination clients get a tunnel destroy * notification. If the last destination disconnects (only one remaining client * in tunnel), the origin gets a (local ID) peer disconnected. * Note that the function must be called BEFORE removing the client from * the tunnel. * * @param t Tunnel that was destroyed. * @param c Client that disconnected. */ static void send_client_tunnel_disconnect (struct MeshTunnel *t, struct MeshClient *c) { unsigned int i; if (c == t->owner) { struct GNUNET_MESH_TunnelMessage msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); msg.tunnel_id = htonl (t->local_tid_dest); for (i = 0; i < t->nclients; i++) GNUNET_SERVER_notification_context_unicast (nc, t->clients[i]->handle, &msg.header, GNUNET_NO); } // FIXME when to disconnect an incoming tunnel? else if (1 == t->nclients && NULL != t->owner) { struct GNUNET_MESH_PeerControl msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); msg.tunnel_id = htonl (t->local_tid); msg.peer = my_full_id; GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, &msg.header, GNUNET_NO); } } /** * 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); /** * 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); /** * Decrements the reference counter and frees all resources if needed * * @param mesh_data Data Descriptor used in a multicast message. * Freed no longer needed (last message). */ static void data_descriptor_decrement_multicast (struct MeshData *mesh_data) { /* Make sure it's a multicast packet */ GNUNET_assert (NULL != mesh_data->reference_counter); if (0 == --(*(mesh_data->reference_counter))) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Last copy!\n"); if (NULL != mesh_data->task) { if (GNUNET_SCHEDULER_NO_TASK != *(mesh_data->task)) { GNUNET_SCHEDULER_cancel (*(mesh_data->task)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " notifying client...\n"); GNUNET_SERVER_receive_done (mesh_data->t->owner->handle, GNUNET_OK); } GNUNET_free (mesh_data->task); } GNUNET_free (mesh_data->reference_counter); GNUNET_free (mesh_data->data); GNUNET_free (mesh_data); } } /** * Cancel a core transmission that was already requested and free all resources * associated to the request. * * @param peer PeeInfo of the peer whose transmission is cancelled. * @param i Position of the transmission to be cancelled. */ static void peer_info_cancel_transmission (struct MeshPeerInfo *peer, unsigned int i) { if (NULL != peer->core_transmit[i]) { struct MeshTransmissionDescriptor *dd; struct MeshPathInfo *path_info; #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer->id, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Cancelling data transmission at %s [%u]\n", GNUNET_i2s (&id), i); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " message type %u\n", peer->types[i]); } #endif /* TODO: notify that tranmission has failed */ switch (peer->types[i]) { case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: case GNUNET_MESSAGE_TYPE_MESH_UNICAST: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type payload\n"); dd = peer->infos[i]; data_descriptor_decrement_multicast (dd->mesh_data); break; case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n"); path_info = peer->infos[i]; path_destroy (path_info->path); break; default: GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type unknown!\n"); } GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit[i]); peer->core_transmit[i] = NULL; GNUNET_free (peer->infos[i]); } } /** * Get a unused CORE slot to transmit a message to a peer. If all the slots * are used, cancel one and return it's position. * * @param peer PeerInfo of the neighbor we want to transmit to. * * @return The index of an available slot to transmit to the neighbor. */ static unsigned int peer_info_transmit_slot (struct MeshPeerInfo *peer) { unsigned int i; for (i = 0; peer->core_transmit[i]; i++) { if (i == (CORE_QUEUE_SIZE - 1)) { /* All positions are taken! Overwriting! */ GNUNET_break (0); peer_info_cancel_transmission (peer, 0); return 0; } } return i; } /** * 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 Full 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; } /** * 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 Short identity of the peer. * * @return Existing or newly created peer info. */ static struct MeshPeerInfo * peer_info_get_short (const GNUNET_PEER_Id peer) { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer, &id); return peer_info_get (&id); } /** * Iterator to remove the tunnel from the list of tunnels a peer participates * in. * * @param cls Closure (tunnel info) * @param key GNUNET_PeerIdentity of the peer (unused) * @param value PeerInfo of the peer * * @return always GNUNET_YES, to keep iterating */ static int peer_info_delete_tunnel (void *cls, const GNUNET_HashCode * key, void *value) { struct MeshTunnel *t = cls; struct MeshPeerInfo *peer = value; unsigned int i; for (i = 0; i < peer->ntunnels; i++) { if (0 == memcmp (&peer->tunnels[i]->id, &t->id, sizeof (struct MESH_TunnelID))) { peer->ntunnels--; peer->tunnels[i] = peer->tunnels[peer->ntunnels]; peer->tunnels = GNUNET_realloc (peer->tunnels, peer->ntunnels); return GNUNET_YES; } } return GNUNET_YES; } /** * Core callback to write a * * @param cls Closure (MeshTransmissionDescriptor with data in "data" member). * @param size Number of bytes available in buf. * @param buf Where the to 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 MeshTransmissionDescriptor *info = cls; struct GNUNET_MessageHeader *msg; size_t total_size; GNUNET_assert (NULL != info); GNUNET_assert (NULL != info->mesh_data); msg = (struct GNUNET_MessageHeader *) info->mesh_data->data; total_size = ntohs (msg->size); if (total_size > size) { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (info->peer->id, &id); info->peer->core_transmit[info->handler_n] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100, GNUNET_TIME_UNIT_FOREVER_REL, &id, size, &send_core_data_raw, info); return 0; } info->peer->core_transmit[info->handler_n] = NULL; memcpy (buf, msg, total_size); GNUNET_free (info->mesh_data); GNUNET_free (info); return total_size; } /** * Sends an already built message to a peer, properly registrating * all used resources. * * @param message Message to send. Fucntion makes a copy of it. * @param peer Short ID of the neighbor whom to send the message. * * FIXME tunnel? */ static void send_message (const struct GNUNET_MessageHeader *message, const struct GNUNET_PeerIdentity *peer) { struct MeshTransmissionDescriptor *info; struct MeshPeerInfo *neighbor; struct MeshPeerPath *p; unsigned int i; size_t size; // GNUNET_TRANSPORT_try_connect(); size = ntohs (message->size); info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); info->mesh_data = GNUNET_malloc (sizeof (struct MeshData)); info->mesh_data->data = GNUNET_malloc (size); memcpy (info->mesh_data->data, message, size); info->mesh_data->data_len = size; neighbor = peer_info_get (peer); for (p = neighbor->path_head; NULL != p; p = p->next) { if (2 == p->length) { break; } } if (NULL == p) { GNUNET_break (0); GNUNET_free (info->mesh_data->data); GNUNET_free (info->mesh_data); GNUNET_free (info); return; } i = peer_info_transmit_slot (neighbor); info->handler_n = i; info->peer = neighbor; neighbor->types[i] = GNUNET_MESSAGE_TYPE_MESH_UNICAST; neighbor->infos[i] = info; neighbor->core_transmit[i] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 100, GNUNET_TIME_UNIT_FOREVER_REL, peer, size, &send_core_data_raw, info); } /** * Sends a CREATE PATH message for a path to a peer, properly registrating * all used resources. * * @param peer PeerInfo of the final peer for whom this path is being created. * @param p Path itself. * @param t Tunnel for which the path is created. */ static void send_create_path (struct MeshPeerInfo *peer, struct MeshPeerPath *p, struct MeshTunnel *t) { struct GNUNET_PeerIdentity id; struct MeshPathInfo *path_info; struct MeshPeerInfo *neighbor; unsigned int i; if (NULL == p) { p = tree_get_path_to_peer (t->tree, peer->id); if (NULL == p) { GNUNET_break (0); return; } } for (i = 0; i < p->length; i++) { if (p->peers[i] == myid) break; } if (i >= p->length - 1) { path_destroy (p); GNUNET_break (0); return; } GNUNET_PEER_resolve (p->peers[i + 1], &id); path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info->path = p; path_info->t = t; neighbor = peer_info_get (&id); path_info->peer = neighbor; path_info->pos = peer_info_transmit_slot (neighbor); neighbor->types[path_info->pos] = GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE; neighbor->infos[path_info->pos] = path_info; neighbor->core_transmit[path_info->pos] = 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 */ } /** * Sends a DESTROY PATH message to free resources for a path in a tunnel * * @param t Tunnel whose path to destroy. * @param destination Short ID of the peer to whom the path to destroy. */ static void send_destroy_path (struct MeshTunnel *t, GNUNET_PEER_Id destination) { struct MeshPeerPath *p; size_t size; p = tree_get_path_to_peer (t->tree, destination); if (NULL == p) { GNUNET_break (0); return; } size = sizeof (struct GNUNET_MESH_ManipulatePath); size += p->length * sizeof (struct GNUNET_PeerIdentity); { struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *pi; char cbuf[size]; unsigned int i; msg = (struct GNUNET_MESH_ManipulatePath *) cbuf; msg->header.size = htons (size); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY); msg->tid = htonl (t->id.tid); pi = (struct GNUNET_PeerIdentity *) &msg[1]; for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve (p->peers[i], &pi[i]); } send_message (&msg->header, tree_get_first_hop (t->tree, destination)); } path_destroy (p); } /** * Try to establish a new connection to this peer. * Use the best path for the given tunnel. * If the peer doesn't have any path to it yet, try to get one. * If the peer already has some path, send a CREATE PATH towards it. * * @param peer PeerInfo of the peer. * @param t Tunnel for which to create the path, if possible. */ static void peer_info_connect (struct MeshPeerInfo *peer, struct MeshTunnel *t) { struct MeshPeerPath *p; struct MeshPathInfo *path_info; if (NULL != peer->path_head) { p = tree_get_path_to_peer (t->tree, peer->id); if (NULL == p) { GNUNET_break (0); return; } // FIXME always send create path to self if (p->length > 1) { send_create_path (peer, p, t); } else { GNUNET_HashCode hash; path_destroy (p); send_client_peer_connected (t, myid); t->local_tid_dest = next_local_tid++; GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) { GNUNET_break (0); return; } } } else if (NULL == peer->dhtget) { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer->id, &id); path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info->peer = peer; path_info->t = t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Starting DHT GET for peer %s\n", GNUNET_i2s (&id)); peer->dhtgetcls = path_info; peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */ GNUNET_TIME_UNIT_FOREVER_REL, /* timeout */ GNUNET_BLOCK_TYPE_TEST, /* type */ &id.hashPubKey, /* key to search */ 10, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, /* xquery */ 0, /* xquery bits */ &dht_get_id_handler, path_info); } /* Otherwise, there is no path but the DHT get is already started. */ } /** * Task to delay the connection of a peer * * @param cls Closure (path info with tunnel and peer to connect). * Will be free'd on exection. * @param tc TaskContext */ static void peer_info_connect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshPathInfo *path_info = cls; if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason)) { GNUNET_free (cls); return; } peer_info_connect (path_info->peer, path_info->t); GNUNET_free (cls); } /** * Destroy the peer_info and free any allocated resources linked to it * * @param pi The peer_info to destroy. * * @return GNUNET_OK on success */ static int peer_info_destroy (struct MeshPeerInfo *pi) { struct GNUNET_PeerIdentity id; struct MeshPeerPath *p; struct MeshPeerPath *nextp; unsigned int i; GNUNET_PEER_resolve (pi->id, &id); GNUNET_PEER_change_rc (pi->id, -1); if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (peers, &id.hashPubKey, pi)) { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "removing peer %s, not in hashmap\n", GNUNET_i2s (&id)); } if (NULL != pi->dhtget) { GNUNET_DHT_get_stop (pi->dhtget); GNUNET_free (pi->dhtgetcls); } for (i = 0; i < CORE_QUEUE_SIZE; i++) { peer_info_cancel_transmission (pi, i); } p = pi->path_head; while (NULL != p) { nextp = p->next; GNUNET_CONTAINER_DLL_remove (pi->path_head, pi->path_tail, p); path_destroy (p); p = nextp; } GNUNET_free (pi); return GNUNET_OK; } /** * 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 peer_info_remove_path (struct MeshPeerInfo *peer, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { 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)) { GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p); 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], p1, p2); if (0 == d) continue; /* 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. */ peer_d = peer_info_get_short (d); best = UINT_MAX; aux = NULL; for (p = peer_d->path_head; NULL != p; p = p->next) { if ((cost = tree_get_path_cost (peer->tunnels[i]->tree, p)) < best) { best = cost; aux = p; } } if (NULL != aux) { /* No callback, as peer will be already disconnected and a connection * scheduled by tunnel_notify_connection_broken. */ tree_add_path (peer->tunnels[i]->tree, aux, NULL, NULL); } else { peer_info_connect (peer_d, peer->tunnels[i]); } } } /** * 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. * @param trusted Do we trust that this path is real? */ void peer_info_add_path (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path, int trusted) { struct MeshPeerPath *aux; unsigned int l; unsigned int l2; if ((NULL == peer_info) || (NULL == path)) { GNUNET_break (0); path_destroy (path); return; } if (path->peers[path->length - 1] != peer_info->id) { GNUNET_break (0); path_destroy (path); return; } if (path->length <= 2 && GNUNET_NO == trusted) { /* Only allow CORE to tell us about direct paths */ path_destroy (path); return; } GNUNET_assert (peer_info->id == path->peers[path->length - 1]); for (l = 1; l < path->length; l++) { if (path->peers[l] == myid) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l); for (l2 = 0; l2 < path->length - l; l2++) { path->peers[l2] = path->peers[l + l2]; } path->length -= l; l = 1; path->peers = GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id)); } } #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer_info->id, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n", path->length, GNUNET_i2s (&id)); } #endif l = path_get_length (path); if (0 == l) { GNUNET_free (path); return; } GNUNET_assert (peer_info->id == path->peers[path->length - 1]); 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); return; } 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. * @param trusted Do we trust that this path is real? */ static void peer_info_add_path_to_origin (struct MeshPeerInfo *peer_info, struct MeshPeerPath *path, int trusted) { path_invert (path); peer_info_add_path (peer_info, path, trusted); } /** * 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 (1); p->peers[0] = myid; GNUNET_PEER_change_rc (myid, 1); i = get_path_length; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " 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, " Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc (id, -1); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n", GNUNET_i2s (&get_path[i])); p->length++; p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); p->peers[p->length - 1] = id; } } i = put_path_length; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i); for (i--; i >= 0; i--) { id = GNUNET_PEER_intern (&put_path[i]); if (id == myid) { /* PUT path went through us, so discard the path up until now and start * from here to get a much shorter (and loop-free) path. */ path_destroy (p); p = path_new (0); } if (p->length > 0 && id == p->peers[p->length - 1]) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc (id, -1); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n", GNUNET_i2s (&put_path[i])); p->length++; p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); p->peers[p->length - 1] = id; } } #if MESH_DEBUG if (get_path_length > 0) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n", GNUNET_i2s (&get_path[0])); if (put_path_length > 0) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n", GNUNET_i2s (&put_path[0])); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n", p->length); for (i = 0; i < p->length; i++) { struct GNUNET_PeerIdentity peer_id; GNUNET_PEER_resolve (p->peers[i], &peer_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i], GNUNET_i2s (&peer_id)); } #endif return p; } /** * Adds a path to the peer_infos of all the peers in the path * * @param p Path to process. * @param confirmed Whether we know if the path works or not. FIXME use */ static void path_add_to_peers (struct MeshPeerPath *p, int confirmed) { unsigned int i; /* TODO: invert and add */ for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ; for (i++; i < p->length; i++) { struct MeshPeerInfo *aux; struct MeshPeerPath *copy; aux = peer_info_get_short (p->peers[i]); copy = path_duplicate (p); copy->length = i + 1; peer_info_add_path (aux, copy, GNUNET_NO); } } /** * 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? */ static void path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * Search for a tunnel among the incoming tunnels * * @param tid the local id of the tunnel * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_incoming (MESH_TunnelNumber tid) { GNUNET_HashCode hash; GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV); GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); return GNUNET_CONTAINER_multihashmap_get (incoming_tunnels, &hash); } /** * 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) { if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { return tunnel_get_incoming (tid); } else { GNUNET_HashCode hash; GNUNET_CRYPTO_hash (&tid, sizeof (MESH_TunnelNumber), &hash); return GNUNET_CONTAINER_multihashmap_get (c->own_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); } /** * Delete an active client from the tunnel. * * @param t Tunnel. * @param c Client. */ static void tunnel_delete_active_client (struct MeshTunnel *t, const struct MeshClient *c) { unsigned int i; for (i = 0; i < t->nclients; i++) { if (t->clients[i] == c) { t->clients[i] = t->clients[t->nclients - 1]; GNUNET_array_grow (t->clients, t->nclients, t->nclients - 1); break; } } } /** * Delete an ignored client from the tunnel. * * @param t Tunnel. * @param c Client. */ static void tunnel_delete_ignored_client (struct MeshTunnel *t, const struct MeshClient *c) { unsigned int i; for (i = 0; i < t->nignore; i++) { if (t->ignore[i] == c) { t->ignore[i] = t->ignore[t->nignore - 1]; GNUNET_array_grow (t->ignore, t->nignore, t->nignore - 1); break; } } } /** * Delete a client from the tunnel. It should be only done on * client disconnection, otherwise use client_ignore_tunnel. * * @param t Tunnel. * @param c Client. */ static void tunnel_delete_client (struct MeshTunnel *t, const struct MeshClient *c) { tunnel_delete_ignored_client (t, c); tunnel_delete_active_client (t, c); } /** * Callback used to notify a client owner of a tunnel that a peer has * disconnected, most likely because of a path change. * * @param cls Closure (tunnel this notification is about). * @param peer_id Short ID of disconnected peer. */ void notify_peer_disconnected (void *cls, GNUNET_PEER_Id peer_id) { struct MeshTunnel *t = cls; struct MeshPeerInfo *peer; struct MeshPathInfo *path_info; if (NULL != t->owner && NULL != nc) { struct GNUNET_MESH_PeerControl msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); msg.tunnel_id = htonl (t->local_tid); GNUNET_PEER_resolve (peer_id, &msg.peer); GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, &msg.header, GNUNET_NO); } peer = peer_info_get_short (peer_id); path_info = GNUNET_malloc (sizeof (struct MeshPathInfo)); path_info->peer = peer; path_info->t = t; GNUNET_SCHEDULER_add_now (&peer_info_connect_task, path_info); } /** * Add a peer to a tunnel, accomodating paths accordingly and initializing all * needed rescources. * If peer already exists, reevaluate shortest path and change if different. * * @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 GNUNET_PeerIdentity id; struct MeshPeerPath *best_p; struct MeshPeerPath *p; unsigned int best_cost; unsigned int cost; GNUNET_PEER_resolve (peer->id, &id); if (GNUNET_NO == GNUNET_CONTAINER_multihashmap_contains (t->peers, &id.hashPubKey)) { t->peers_total++; GNUNET_array_append (peer->tunnels, peer->ntunnels, t); GNUNET_assert (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (t->peers, &id.hashPubKey, peer, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)); } if (NULL != (p = peer->path_head)) { best_p = p; best_cost = tree_get_path_cost (t->tree, p); while (NULL != p) { if ((cost = tree_get_path_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, t); if (GNUNET_SCHEDULER_NO_TASK == t->path_refresh_task) t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &path_refresh, t); } else { /* Start a DHT get */ peer_info_connect (peer, t); } } /** * Add a path to a tunnel which we don't own, just to remember the next hop. * If destination node was already in the tunnel, the first hop information * will be replaced with the new path. * * @param t Tunnel we want to add a new peer to * @param p Path to add * @param own_pos Position of local node in path. * */ static void tunnel_add_path (struct MeshTunnel *t, struct MeshPeerPath *p, unsigned int own_pos) { struct GNUNET_PeerIdentity id; GNUNET_assert (0 != own_pos); tree_add_path (t->tree, p, NULL, NULL); if (own_pos < p->length - 1) { GNUNET_PEER_resolve (p->peers[own_pos + 1], &id); tree_update_first_hops (t->tree, myid, &id); } } /** * Notifies a tunnel that a connection has broken that affects at least * some of its peers. Sends a notification towards the root of the tree. * In case the peer is the owner of the tree, notifies the client that owns * the tunnel and tries to reconnect. * * @param t Tunnel affected. * @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, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { GNUNET_PEER_Id pid; pid = tree_notify_connection_broken (t->tree, p1, p2, ¬ify_peer_disconnected, t); if (myid != p1 && myid != p2) { return pid; } if (pid != myid) { if (tree_get_predecessor (t->tree) != 0) { /* We are the peer still connected, notify owner of the disconnection. */ struct GNUNET_MESH_PathBroken msg; struct GNUNET_PeerIdentity neighbor; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN); GNUNET_PEER_resolve (t->id.oid, &msg.oid); msg.tid = htonl (t->id.tid); msg.peer1 = my_full_id; GNUNET_PEER_resolve (pid, &msg.peer2); GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor); send_message (&msg.header, &neighbor); } } return pid; } /** * Send a multicast packet to a neighbor. * * @param cls Closure (Info about the multicast packet) * @param neighbor_id Short ID of the neighbor to send the packet to. */ static void tunnel_send_multicast_iterator (void *cls, GNUNET_PEER_Id neighbor_id) { struct MeshData *mdata = cls; struct MeshTransmissionDescriptor *info; struct GNUNET_PeerIdentity neighbor; unsigned int i; info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); info->mesh_data = mdata; (*(mdata->reference_counter)) ++; info->destination = neighbor_id; GNUNET_PEER_resolve (neighbor_id, &neighbor); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending to %s...\n", GNUNET_i2s (&neighbor)); info->peer = peer_info_get (&neighbor); GNUNET_assert (NULL != info->peer); i = peer_info_transmit_slot (info->peer); info->handler_n = i; info->peer->infos[i] = info; info->peer->types[i] = GNUNET_MESSAGE_TYPE_MESH_MULTICAST; info->peer->core_transmit[i] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &neighbor, info->mesh_data->data_len, &send_core_data_multicast, info); } /** * Send a message in a tunnel in multicast, sending a copy to each child node * down the local one in the tunnel tree. * * @param t Tunnel in which to send the data. * @param msg Message to be sent. * @param internal Has the service generated this message? */ static void tunnel_send_multicast (struct MeshTunnel *t, const struct GNUNET_MessageHeader *msg, int internal) { struct MeshData *mdata; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending a multicast packet...\n"); mdata = GNUNET_malloc (sizeof (struct MeshData)); mdata->data_len = ntohs (msg->size); mdata->reference_counter = GNUNET_malloc (sizeof (unsigned int)); mdata->t = t; mdata->data = GNUNET_malloc (mdata->data_len); memcpy (mdata->data, msg, mdata->data_len); if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST) { struct GNUNET_MESH_Multicast *mcast; mcast = (struct GNUNET_MESH_Multicast *) mdata->data; mcast->ttl = htonl (ntohl (mcast->ttl) - 1); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " data packet, ttl: %u\n", ntohl (mcast->ttl)); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not a data packet, no ttl\n"); } if (NULL != t->owner && GNUNET_YES != t->owner->shutting_down && GNUNET_NO == internal) { mdata->task = GNUNET_malloc (sizeof (GNUNET_SCHEDULER_TaskIdentifier)); (*(mdata->task)) = GNUNET_SCHEDULER_add_delayed (UNACKNOWLEDGED_WAIT, &client_allow_send, mdata); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "timeout task %u\n", *(mdata->task)); } tree_iterate_children (t->tree, &tunnel_send_multicast_iterator, mdata); if (*(mdata->reference_counter) == 0) { GNUNET_free (mdata->data); GNUNET_free (mdata->reference_counter); if (NULL != mdata->task) { GNUNET_SCHEDULER_cancel(*(mdata->task)); GNUNET_free (mdata->task); GNUNET_SERVER_receive_done(t->owner->handle, GNUNET_OK); } // FIXME change order? GNUNET_free (mdata); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending a multicast packet done\n"); return; } /** * Send a message to all peers in this tunnel that the tunnel is no longer * valid. * * @param t The tunnel whose peers to notify. */ static void tunnel_send_destroy (struct MeshTunnel *t) { struct GNUNET_MESH_TunnelDestroy msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY); GNUNET_PEER_resolve (t->id.oid, &msg.oid); msg.tid = htonl (t->id.tid); tunnel_send_multicast (t, &msg.header, GNUNET_NO); } /** * 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; unsigned int i; int r; if (NULL == t) return GNUNET_OK; r = GNUNET_OK; c = t->owner; #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (t->id.oid, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n", GNUNET_i2s (&id), t->id.tid); if (NULL != c) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " 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 (NULL != c && GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->own_tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); for (i = 0; i < t->nclients; i++) { c = t->clients[i]; if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->incoming_tunnels, &hash, t)) { r = GNUNET_SYSERR; } } for (i = 0; i < t->nignore; i++) { c = t->ignore[i]; if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (c->ignore_tunnels, &hash, t)) { r = GNUNET_SYSERR; } } if (t->nclients > 0) { if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_free (t->clients); } if (NULL != t->peers) { GNUNET_CONTAINER_multihashmap_iterate (t->peers, &peer_info_delete_tunnel, t); 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); if (NULL != t->dht_get_type) GNUNET_DHT_get_stop (t->dht_get_type); if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task) GNUNET_SCHEDULER_cancel (t->timeout_task); if (GNUNET_SCHEDULER_NO_TASK != t->path_refresh_task) GNUNET_SCHEDULER_cancel (t->path_refresh_task); GNUNET_free (t); return r; } /** * Removes an explicit path from a tunnel, freeing all intermediate nodes * that are no longer needed, as well as nodes of no longer reachable peers. * The tunnel itself is also destoyed if results in a remote empty tunnel. * * @param t Tunnel from which to remove the path. * @param peer Short id of the peer which should be removed. */ static void tunnel_delete_peer (struct MeshTunnel *t, GNUNET_PEER_Id peer) { if (GNUNET_NO == tree_del_peer (t->tree, peer, NULL, NULL)) tunnel_destroy (t); } /** * tunnel_destroy_iterator: iterator for deleting each tunnel that belongs to a * client when the client disconnects. If the client is not the owner, the * owner will get notified if no more clients are in the tunnel and the client * get removed from the tunnel's list. * * @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) { struct MeshTunnel *t = value; struct MeshClient *c = cls; int r; send_client_tunnel_disconnect(t, c); if (c != t->owner) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Client %u is destination, keeping the tunnel alive.\n", c->id); tunnel_delete_client(t, c); client_delete_tunnel(c, t); return GNUNET_OK; } tunnel_send_destroy(t); r = tunnel_destroy (t); return r; } /** * Timeout function, destroys tunnel if called * * @param cls Closure (tunnel to destroy). * @param tc TaskContext */ static void tunnel_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; if (GNUNET_SCHEDULER_REASON_SHUTDOWN == tc->reason) return; t->timeout_task = GNUNET_SCHEDULER_NO_TASK; tunnel_destroy (t); } /** * Resets the tunnel timeout. Starts it if no timeout was running. * * @param t Tunnel whose timeout to reset. */ static void tunnel_reset_timeout (struct MeshTunnel *t) { if (GNUNET_SCHEDULER_NO_TASK != t->timeout_task) GNUNET_SCHEDULER_cancel (t->timeout_task); t->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply (REFRESH_PATH_TIME, 4), &tunnel_timeout, t); } /******************************************************************************/ /**************** 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n"); 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, "create path retransmit!\n"); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " buf: %p\n", buf); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " size: (%u/%u)\n", size, size_needed); info->peer->core_transmit[info->pos] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, tree_get_first_hop (t->tree, peer->id), size_needed, &send_core_create_path, info); return 0; } info->peer->core_transmit[info->pos] = NULL; #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer->id, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " setting core_transmit %s [%u] to NULL\n", GNUNET_i2s (&id), info->pos); } #endif 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); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH (%u bytes long) sent!\n", size_needed); return size_needed; } /** * 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 MeshTransmissionDescriptor *info = cls; size_t total_size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Multicast callback.\n"); GNUNET_assert (NULL != info); GNUNET_assert (NULL != info->peer); total_size = info->mesh_data->data_len; GNUNET_assert (total_size < GNUNET_SERVER_MAX_MESSAGE_SIZE); if (total_size > size) { /* Retry */ struct GNUNET_PeerIdentity id; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Multicast: retransmitting... (%u/%u)\n", size, total_size); GNUNET_PEER_resolve (info->peer->id, &id); 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " copying data...\n"); memcpy (buf, info->mesh_data->data, total_size); #if MESH_DEBUG { struct GNUNET_MESH_Multicast *mc; struct GNUNET_MessageHeader *mh; mh = buf; if (ntohs (mh->type) == GNUNET_MESSAGE_TYPE_MESH_MULTICAST) { mc = (struct GNUNET_MESH_Multicast *) mh; mh = (struct GNUNET_MessageHeader *) &mc[1]; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " multicast, payload type %u\n", ntohs (mh->type)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " multicast, payload size %u\n", ntohs (mh->size)); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type %u\n", ntohs (mh->type)); } } #endif data_descriptor_decrement_multicast (info->mesh_data); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "freeing info...\n"); GNUNET_free (info); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "return %u\n", total_size); 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 (MeshTransmissionDescriptor) * @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 MeshTransmissionDescriptor *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 */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n"); return sizeof (struct GNUNET_MESH_PathACK); } /******************************************************************************/ /******************** MESH NETWORK HANDLERS **************************/ /******************************************************************************/ /** * Core handler for path creation * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @param atsi_count number of records in 'atsi' * * @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_ATS_Information *atsi, unsigned int atsi_count) { unsigned int own_pos; uint16_t size; uint16_t i; MESH_TunnelNumber tid; struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *pi; 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, "Received a path create msg [%s]\n", GNUNET_i2s (&my_full_id)); 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; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); msg = (struct GNUNET_MESH_ManipulatePath *) message; tid = ntohl (msg->tid); pi = (struct GNUNET_PeerIdentity *) &msg[1]; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path is for tunnel %s [%X].\n", GNUNET_i2s (pi), tid); t = tunnel_get (pi, tid); if (NULL == t) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n"); t = GNUNET_malloc (sizeof (struct MeshTunnel)); t->id.oid = GNUNET_PEER_intern (pi); t->id.tid = tid; while (NULL != tunnel_get_incoming (next_local_tid)) next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; t->local_tid_dest = next_local_tid++; next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; t->tree = tree_new (t->id.oid); GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) { tunnel_destroy (t); GNUNET_break (0); return GNUNET_OK; } tunnel_reset_timeout (t); GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) { tunnel_destroy (t); GNUNET_break (0); return GNUNET_OK; } } dest_peer_info = GNUNET_CONTAINER_multihashmap_get (peers, &pi[size - 1].hashPubKey); if (NULL == dest_peer_info) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating PeerInfo for destination.\n"); 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) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating PeerInfo for origin.\n"); 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); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n"); path = path_new (size); own_pos = 0; for (i = 0; i < size; i++) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n", GNUNET_i2s (&pi[i])); path->peers[i] = GNUNET_PEER_intern (&pi[i]); if (path->peers[i] == myid) own_pos = i; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); 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; } path_add_to_peers (path, GNUNET_NO); tunnel_add_path (t, path, own_pos); if (own_pos == size - 1) { /* It is for us! Send ack. */ struct MeshTransmissionDescriptor *info; unsigned int j; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); peer_info_add_path_to_origin (orig_peer_info, path, GNUNET_NO); if (NULL == t->peers) { /* New tunnel! Notify clients on data. */ t->peers = GNUNET_CONTAINER_multihashmap_create (4); } GNUNET_break (GNUNET_OK == GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey, peer_info_get (&my_full_id), GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE)); /* FIXME use send_message */ info = GNUNET_malloc (sizeof (struct MeshTransmissionDescriptor)); info->origin = &t->id; info->peer = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); GNUNET_assert (NULL != info->peer); j = peer_info_transmit_slot (info->peer); info->handler_n = j; info->peer->types[j] = GNUNET_MESSAGE_TYPE_MESH_PATH_ACK; info->peer->infos[j] = info; info->peer->core_transmit[j] = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 10, GNUNET_TIME_UNIT_FOREVER_REL, peer, sizeof (struct GNUNET_MESH_PathACK), &send_core_path_ack, info); } else { struct MeshPeerPath *path2; /* It's for somebody else! Retransmit. */ path2 = path_duplicate (path); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n"); peer_info_add_path (dest_peer_info, path2, GNUNET_NO); path2 = path_duplicate (path); peer_info_add_path_to_origin (orig_peer_info, path2, GNUNET_NO); send_create_path (dest_peer_info, path, t); } return GNUNET_OK; } /** * Core handler for path destruction * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @param atsi_count number of records in 'atsi' * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_path_destroy (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *pi; struct MeshPeerPath *path; struct MeshTunnel *t; unsigned int own_pos; unsigned int i; size_t size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a PATH DESTROY msg from %s\n", GNUNET_i2s (peer)); 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; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); msg = (struct GNUNET_MESH_ManipulatePath *) message; pi = (struct GNUNET_PeerIdentity *) &msg[1]; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path is for tunnel %s [%X].\n", GNUNET_i2s (pi), msg->tid); t = tunnel_get (pi, ntohl (msg->tid)); if (NULL == t) { /* TODO notify back: we don't know this tunnel */ GNUNET_break_op (0); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n"); path = path_new (size); own_pos = 0; for (i = 0; i < size; i++) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n", GNUNET_i2s (&pi[i])); path->peers[i] = GNUNET_PEER_intern (&pi[i]); if (path->peers[i] == myid) own_pos = i; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); if (own_pos < path->length - 1) send_message (message, &pi[own_pos + 1]); else send_client_tunnel_disconnect(t, NULL); tunnel_delete_peer (t, path->peers[path->length - 1]); path_destroy (path); return GNUNET_OK; } /** * Core handler for notifications of broken paths * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @param atsi_count number of records in 'atsi' * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_PathBroken *msg; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_PathBroken *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer1)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer2)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { GNUNET_break_op (0); return GNUNET_OK; } tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1), GNUNET_PEER_search (&msg->peer2)); return GNUNET_OK; } /** * Core handler for tunnel destruction * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @param atsi_count number of records in 'atsi' * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_TunnelDestroy *msg; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_TunnelDestroy *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for tunnel %s [%u]\n", GNUNET_i2s (&msg->oid), ntohl (msg->tid)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* Probably already got the message from another path, * destroyed the tunnel and retransmitted to children. * Safe to ignore. */ return GNUNET_OK; } if (t->id.oid == myid) { GNUNET_break_op (0); return GNUNET_OK; } if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { /* Tunnel was incoming, notify clients */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n", t->local_tid, t->local_tid_dest); send_clients_tunnel_destroy (t); } tunnel_send_destroy (t); tunnel_destroy (t); 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 * @param atsi_count number of records in 'atsi' * @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_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_Unicast *msg; struct MeshTunnel *t; GNUNET_PEER_Id pid; size_t size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a unicast packet from %s\n", GNUNET_i2s (peer)); 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %u\n", ntohs (msg[1].header.type)); 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; } tunnel_reset_timeout (t); pid = GNUNET_PEER_search (&msg->destination); if (pid == myid) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to clients...\n"); send_subscribed_clients (message, (struct GNUNET_MessageHeader *) &msg[1]); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); send_message (message, tree_get_first_hop (t->tree, pid)); 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 * @param atsi_count number of records in 'atsi' * @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_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_Multicast *msg; struct MeshTunnel *t; size_t size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a multicast packet from %s\n", GNUNET_i2s (peer)); size = ntohs (message->size); if (sizeof (struct GNUNET_MESH_Multicast) + sizeof (struct GNUNET_MessageHeader) > size) { 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; } if (t->mid == ntohl (msg->mid)) { /* FIXME: already seen this packet, log dropping */ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " Already seen mid %u, DROPPING!\n", t->mid); return GNUNET_OK; } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " mid %u not seen yet, forwarding\n", ntohl (msg->mid)); } t->mid = ntohl (msg->mid); tunnel_reset_timeout (t); /* Transmit to locally interested clients */ if (NULL != t->peers && GNUNET_CONTAINER_multihashmap_contains (t->peers, &my_full_id.hashPubKey)) { send_subscribed_clients (message, &msg[1].header); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ntohl (msg->ttl)); if (ntohl (msg->ttl) == 0) { /* FIXME: ttl is 0, log dropping */ GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n"); return GNUNET_OK; } tunnel_send_multicast (t, message, GNUNET_NO); return GNUNET_OK; } /** * Core handler for mesh network traffic toward the owner of a tunnel * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @param atsi_count number of records in 'atsi' * * @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_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_ToOrigin *msg; struct GNUNET_PeerIdentity id; struct MeshPeerInfo *peer_info; struct MeshTunnel *t; size_t size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a ToOrigin packet from %s\n", GNUNET_i2s (peer)); 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " of type %u\n", ntohs (msg[1].header.type)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know this tunnel (whom)? */ GNUNET_break_op (0); return GNUNET_OK; } if (t->id.oid == myid) { char cbuf[size]; struct GNUNET_MESH_ToOrigin *copy; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to clients...\n"); if (NULL == t->owner) { /* got data packet for ownerless tunnel */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " no clients!\n"); GNUNET_break_op (0); return GNUNET_OK; } /* TODO signature verification */ memcpy (cbuf, message, size); copy = (struct GNUNET_MESH_ToOrigin *) cbuf; copy->tid = htonl (t->local_tid); GNUNET_SERVER_notification_context_unicast (nc, t->owner->handle, ©->header, GNUNET_YES); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); peer_info = peer_info_get (&msg->oid); if (NULL == peer_info) { /* unknown origin of tunnel */ GNUNET_break (0); return GNUNET_OK; } GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id); send_message (message, &id); 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 * @param atsi_count number of records in 'atsi' * * @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_ATS_Information *atsi, unsigned int atsi_count) { struct GNUNET_MESH_PathACK *msg; struct GNUNET_PeerIdentity id; struct MeshPeerInfo *peer_info; struct MeshPeerPath *p; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n", GNUNET_i2s (&my_full_id)); 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; } peer_info = peer_info_get (&msg->peer_id); /* Add paths to peers? */ p = tree_get_path_to_peer (t->tree, peer_info->id); if (NULL != p) { path_add_to_peers (p, GNUNET_YES); path_destroy (p); } else { GNUNET_break (0); } /* Message for us? */ if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity))) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); if (NULL == t->owner) { GNUNET_break_op (0); return GNUNET_OK; } if (NULL != t->dht_get_type) { GNUNET_DHT_get_stop (t->dht_get_type); t->dht_get_type = NULL; } if (tree_get_status (t->tree, peer_info->id) != MESH_PEER_READY) { tree_set_status (t->tree, peer_info->id, MESH_PEER_READY); send_client_peer_connected (t, peer_info->id); } return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &id); 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; } send_message (message, &id); 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_path_destroy, GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY, 0}, {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN, sizeof (struct GNUNET_MESH_PathBroken)}, {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, 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_break (GNUNET_YES == 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? */ static 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 = sizeof (struct GNUNET_MESH_Multicast) + sizeof (struct GNUNET_MessageHeader); char cbuf[size]; if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN) { return; } t->path_refresh_task = GNUNET_SCHEDULER_NO_TASK; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending keepalive for tunnel %d\n", t->id.tid); msg = (struct GNUNET_MESH_Multicast *) cbuf; 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); msg->ttl = htonl (DEFAULT_TTL); msg->mid = htonl (t->mid + 1); t->mid++; payload = (struct GNUNET_MessageHeader *) &msg[1]; payload->size = htons (sizeof (struct GNUNET_MessageHeader)); payload->type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_KEEPALIVE); tunnel_send_multicast (t, &msg->header, GNUNET_YES); t->path_refresh_task = GNUNET_SCHEDULER_add_delayed (REFRESH_PATH_TIME, &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 get_path path of the get request * @param get_path_length lenght of get_path * @param put_path path of the put request * @param put_path_length length of the put_path * @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 MeshPeerPath *p; struct GNUNET_PeerIdentity pi; int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n"); GNUNET_PEER_resolve (path_info->peer->id, &pi); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi)); p = path_build_from_dht (get_path, get_path_length, put_path, put_path_length); path_add_to_peers (p, GNUNET_NO); path_destroy(p); for (i = 0; i < path_info->peer->ntunnels; i++) { tunnel_add_peer (path_info->peer->tunnels[i], path_info->peer); peer_info_connect (path_info->peer, path_info->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 get_path path of the get request * @param get_path_length lenght of get_path * @param put_path path of the put request * @param put_path_length length of the put_path * @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 MeshTunnel *t = cls; struct MeshPeerInfo *peer_info; struct MeshPeerPath *p; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got type DHT result!\n"); if (size != sizeof (struct GNUNET_PeerIdentity)) { GNUNET_break_op (0); return; } GNUNET_assert (NULL != t->owner); peer_info = peer_info_get (pi); (void) GNUNET_CONTAINER_multihashmap_put (t->peers, &pi->hashPubKey, peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE); p = path_build_from_dht (get_path, get_path_length, put_path, put_path_length); path_add_to_peers (p, GNUNET_NO); path_destroy(p); tunnel_add_peer (t, peer_info); peer_info_connect (peer_info, t); } /******************************************************************************/ /********************* 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, "client disconnected\n"); if (client == NULL) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n"); return; } c = clients; while (NULL != c) { if (c->handle != client) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... searching\n"); c = c->next; continue; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u)\n", c->id); GNUNET_SERVER_client_drop (c->handle); c->shutting_down = GNUNET_YES; GNUNET_assert (NULL != c->own_tunnels); GNUNET_assert (NULL != c->incoming_tunnels); GNUNET_CONTAINER_multihashmap_iterate (c->own_tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap_iterate (c->incoming_tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap_iterate (c->ignore_tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap_destroy (c->own_tunnels); GNUNET_CONTAINER_multihashmap_destroy (c->incoming_tunnels); GNUNET_CONTAINER_multihashmap_destroy (c->ignore_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); next = c->next; GNUNET_CONTAINER_DLL_remove (clients, clients_tail, c); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT FREE at %p\n", c); GNUNET_free (c); c = next; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " 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, "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)); c->id = next_client_id++; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " CLIENT NEW %u\n", c->id); c->handle = client; GNUNET_SERVER_client_keep (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, " 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_log (GNUNET_ERROR_TYPE_DEBUG, " msg type: %u\n", u16); 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, " client has %u+%u subscriptions\n", napps, ntypes); GNUNET_CONTAINER_DLL_insert (clients, clients_tail, c); c->own_tunnels = GNUNET_CONTAINER_multihashmap_create (32); c->incoming_tunnels = GNUNET_CONTAINER_multihashmap_create (32); c->ignore_tunnels = GNUNET_CONTAINER_multihashmap_create (32); GNUNET_SERVER_notification_context_add (nc, client); GNUNET_SERVER_receive_done (client, GNUNET_OK); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n"); } /** * 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, "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; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); /* 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)); 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++; next_tid = next_tid & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; t->id.oid = myid; t->local_tid = ntohl (t_msg->tunnel_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s [%x] (%x)\n", GNUNET_i2s (&my_full_id), t->id.tid, t->local_tid); t->owner = 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->own_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 (myid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel created\n"); 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_log (GNUNET_ERROR_TYPE_DEBUG, "Got a DESTROY TUNNEL from client!\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; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Retrieve tunnel */ tid = ntohl (tunnel_msg->tunnel_id); t = tunnel_get_by_local_id(c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } if (c != t->owner || tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { client_ignore_tunnel (c, t); #if 0 // TODO: when to destroy incoming tunnel? if (t->nclients == 0) { GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (incoming_tunnels, &hash, t)); GNUNET_assert (GNUNET_YES == GNUNET_CONTAINER_multihashmap_remove (t->peers, &my_full_id.hashPubKey, t)); } #endif GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } send_client_tunnel_disconnect(t, c); client_delete_tunnel(c, t); /* Don't try to ACK the client about the tunnel_destroy multicast packet */ t->owner = NULL; tunnel_send_destroy (t); 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 MeshPeerInfo *peer_info; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "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->owner->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&peer_msg->peer)); peer_info = peer_info_get (&peer_msg->peer); tunnel_add_peer (t, peer_info); peer_info_connect (peer_info, t); 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 MeshPeerInfo *peer_info; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a PEER DEL 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; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", t->id.tid); /* Does client own tunnel? */ if (t->owner->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for peer %s\n", GNUNET_i2s (&peer_msg->peer)); /* Is the peer in the tunnel? */ peer_info = GNUNET_CONTAINER_multihashmap_get (t->peers, &peer_msg->peer.hashPubKey); if (NULL == peer_info) { 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); send_destroy_path (t, peer_info->id); tunnel_delete_peer (t, peer_info->id); 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; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "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->owner->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Do WE have the service? */ t->type = ntohl (connect_msg->type); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type requested: %u\n", t->type); GNUNET_CRYPTO_hash (&t->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, and alert the destination client of * an incoming tunnel. * * FIXME send a path create to self, avoid code duplication */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " available locally\n"); GNUNET_CONTAINER_multihashmap_put (t->peers, &my_full_id.hashPubKey, peer_info_get (&my_full_id), GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " notifying client\n"); send_client_peer_connected (t, myid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Done\n"); GNUNET_SERVER_receive_done (client, GNUNET_OK); t->local_tid_dest = next_local_tid++; GNUNET_CRYPTO_hash (&t->local_tid_dest, sizeof (MESH_TunnelNumber), &hash); GNUNET_CONTAINER_multihashmap_put (incoming_tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); return; } /* Ok, lets find a peer offering the service */ if (NULL != t->dht_get_type) { GNUNET_DHT_get_stop (t->dht_get_type); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " looking in DHT for %s\n", GNUNET_h2s (&hash)); t->dht_get_type = GNUNET_DHT_get_start (dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_TEST, &hash, 10, GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a unicast request from a client!\n"); /* 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->owner->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)] GNUNET_ALIGN; 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); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " calling generic handler...\n"); handle_mesh_data_unicast (NULL, &my_full_id, ©->header, NULL, 0); } GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for client traffic directed to the origin * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_to_origin (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_ToOrigin *data_msg; struct GNUNET_PeerIdentity id; struct MeshClient *c; struct MeshTunnel *t; 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_ToOrigin *) message; /* Sanity check for message size */ size = ntohs (message->size); if (sizeof (struct GNUNET_MESH_ToOrigin) + sizeof (struct GNUNET_MessageHeader) > size) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (data_msg->tid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a ToOrigin request from a client! Tunnel %X\n", tid); if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* It should be sent by someone who has this as incoming tunnel. */ if (-1 == client_knows_tunnel (c, t)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_PEER_resolve (t->id.oid, &id); /* Ok, everything is correct, send the message * (pretend we got it from a mesh peer) */ { char buf[ntohs (message->size)] GNUNET_ALIGN; struct GNUNET_MESH_ToOrigin *copy; /* Work around const limitation */ copy = (struct GNUNET_MESH_ToOrigin *) buf; memcpy (buf, data_msg, size); copy->oid = id; copy->tid = htonl (t->id.tid); copy->sender = my_full_id; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " calling generic handler...\n"); handle_mesh_data_to_orig (NULL, &my_full_id, ©->header, NULL, 0); } 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a multicast request from a client!\n"); /* 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_Multicast) + sizeof (struct GNUNET_MessageHeader) > 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->owner->handle != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } { char buf[ntohs (message->size)] GNUNET_ALIGN; 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); copy->ttl = htonl (DEFAULT_TTL); copy->mid = htonl (t->mid + 1); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " calling generic handler...\n"); handle_mesh_data_multicast (client, &my_full_id, ©->header, NULL, 0); } /* receive done gets called when last copy is sent to a neighbor */ 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_to_origin, 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 */ static void core_init (void *cls, struct GNUNET_CORE_Handle *server, const struct GNUNET_PeerIdentity *identity) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "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, _("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 * @param atsi_count number of records in 'atsi' */ static void core_connect (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_ATS_Information *atsi, unsigned int atsi_count) { struct MeshPeerInfo *peer_info; struct MeshPeerPath *path; DEBUG_CONN ("Peer connected\n"); DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id)); peer_info = peer_info_get (peer); if (myid == peer_info->id) { DEBUG_CONN (" (self)\n"); return; } else { DEBUG_CONN (" %s\n", GNUNET_i2s (peer)); } path = path_new (2); path->peers[0] = myid; path->peers[1] = peer_info->id; GNUNET_PEER_change_rc (myid, 1); GNUNET_PEER_change_rc (peer_info->id, 1); peer_info_add_path (peer_info, path, GNUNET_YES); 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; DEBUG_CONN ("Peer disconnected\n"); pi = GNUNET_CONTAINER_multihashmap_get (peers, &peer->hashPubKey); if (NULL == pi) { GNUNET_break (0); return; } for (i = 0; i < CORE_QUEUE_SIZE; i++) { /* TODO: notify that the transmission failed */ peer_info_cancel_transmission (pi, i); } peer_info_remove_path (pi, pi->id, myid); if (myid == pi->id) { DEBUG_CONN (" (self)\n"); } return; } /******************************************************************************/ /************************ MAIN FUNCTIONS ****************************/ /******************************************************************************/ /** * Iterator over tunnel hash map entries to destroy the tunnel during shutdown. * * @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 shutdown_tunnel (void *cls, const GNUNET_HashCode * key, void *value) { struct MeshTunnel *t = value; tunnel_destroy (t); return GNUNET_YES; } /** * Iterator over peer hash map entries to destroy the tunnel during shutdown. * * @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 shutdown_peer (void *cls, const GNUNET_HashCode * key, void *value) { struct MeshPeerInfo *p = value; peer_info_destroy (p); return GNUNET_YES; } /** * Task run during shutdown. * * @param cls unused * @param tc unused */ static void shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n"); if (core_handle != NULL) { GNUNET_CORE_disconnect (core_handle); core_handle = NULL; } GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL); GNUNET_CONTAINER_multihashmap_iterate (peers, &shutdown_peer, NULL); if (dht_handle != NULL) { 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, "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, "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, /* 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); // // transport_handle = GNUNET_TRANSPORT_connect(c, // // &my_full_id, // // NULL, // // NULL, // // NULL, // // NULL); dht_handle = GNUNET_DHT_connect (c, 64); if (dht_handle == NULL) { GNUNET_break (0); } next_tid = 0; next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; tunnels = GNUNET_CONTAINER_multihashmap_create (32); incoming_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; next_client_id = 0; 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; GNUNET_PEER_change_rc (myid, 1); peer_info_add_path (peer, p, GNUNET_YES); /* 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, "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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "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, "main() END\n"); return ret; }