/* 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 * - MESH NETWORK HANDLER HELPERS * - MESH NETWORK HANDLES * - MESH LOCAL HANDLER HELPERS * - MESH LOCAL HANDLES * - PERIODIC FUNCTIONS * - 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 (connection confirmation, others?) */ #include "platform.h" #include "gnunet_common.h" #include "gnunet_util_lib.h" #include "gnunet_peer_lib.h" #include "gnunet_core_service.h" #include "gnunet_protocols.h" #include "mesh.h" #include "mesh_protocol.h" #include "gnunet_dht_service.h" #define REFRESH_PATH_TIME GNUNET_TIME_relative_multiply(\ GNUNET_TIME_UNIT_SECONDS,\ 300) /******************************************************************************/ /************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** * Information regarding a path */ struct MeshPath { /** * Linked list */ struct MeshPath *next; struct MeshPath *prev; /** * Whether the path is serving traffic in a tunnel or is a backup */ int in_use; /** * List of all the peers that form the path from origin to target */ GNUNET_PEER_Id *peers; /** * Number of peers (hops) in the path */ unsigned int length; }; /** * All the states a peer participating in a tunnel can be in. */ enum MeshPeerState { /** * Path to the peer not known yet */ MESH_PEER_SEARCHING, /** * Request sent, not yet answered. */ MESH_PEER_WAITING, /** * Peer connected and ready to accept data */ MESH_PEER_READY, /** * Peer connected previosly but not responding */ MESH_PEER_RECONNECTING }; /** * Struct containing all information regarding a given peer */ struct MeshPeerInfo { /** * ID of the peer */ GNUNET_PEER_Id id; /** * Is the peer reachable? Is the peer even connected? */ enum MeshPeerState state; /** * 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 */ struct MeshPath *path; struct MeshPath *path_tail; /** * Handle to stop the DHT search for a path to this peer */ struct GNUNET_DHT_GetHandle *dhtget; }; /** * 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_MARK ) */ 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_MARK or 0 ) */ MESH_TunnelNumber local_tid; /** * Last time the tunnel was used */ struct GNUNET_TIME_Absolute timestamp; /** * Peers in the tunnelindexed by PeerIdentity (MeshPeerInfo) */ struct GNUNET_CONTAINER_MultiHashMap* peers; /** * Number of peers that are connected and potentially ready to receive data */ unsigned int peers_ready; /** * Number of peers that have been added to the tunnel */ unsigned int peers_total; /** * Client owner of the tunnel, if any */ struct MeshClient *client; /** * Messages ready to transmit */ struct MeshQueue *queue_head; struct MeshQueue *queue_tail; }; /** * Struct containing information about a client of the service */ struct MeshClient { /** * Linked list */ struct MeshClient *next; struct MeshClient *prev; /** * Tunnels that belong to this client, indexed by local id */ struct GNUNET_CONTAINER_MultiHashMap* tunnels; /** * Handle to communicate with the client */ struct GNUNET_SERVER_Client *handle; /** * Applications that this client has claimed to provide */ GNUNET_MESH_ApplicationType *apps; unsigned int app_counter; /** * Messages that this client has declared interest in */ uint16_t *types; unsigned int type_counter; }; /******************************************************************************/ /*********************** GLOBAL VARIABLES ****************************/ /******************************************************************************/ /** * All the clients */ static struct MeshClient *clients; static struct MeshClient *clients_tail; /** * Tunnels known, indexed by MESH_TunnelID (MeshTunnel) */ static struct GNUNET_CONTAINER_MultiHashMap *tunnels; /** * Peers known, indexed by PeerIdentity (MeshPeerInfo) */ static struct GNUNET_CONTAINER_MultiHashMap *peers; /** * Handle to communicate with core */ static struct GNUNET_CORE_Handle *core_handle; /** * Handle to use DHT */ static struct GNUNET_DHT_Handle *dht_handle; /** * Local peer own ID (memory efficient handle) */ static GNUNET_PEER_Id myid; /** * Tunnel ID for the next created tunnel (global tunnel number) */ static MESH_TunnelNumber next_tid; /******************************************************************************/ /****************** GENERAL HELPER FUNCTIONS ************************/ /******************************************************************************/ /** * Retrieve the MeshPeerInfo stucture associated with the peer, create one * and inster it in the appropiate structures if the peer is not known yet. * @param peer Identity of the peer * @return Existing or newly created peer info */ static struct MeshPeerInfo * get_peer_info (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); peer_info->state = MESH_PEER_SEARCHING; } return peer_info; } /** * Find the first peer whom to send a packet to go down this path * @param path The path to use * @return short id of the next peer, myid in case of local delivery, * or 0 in case of error */ static GNUNET_PEER_Id get_first_hop (struct MeshPath *path) { unsigned int i; while (NULL != path) { if (path->in_use) break; path = path->next; } if (NULL == path) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "tried to get the next hop from an invalid path\n"); return 0; } for (i = 0; i < path->length; i++) { if (path->peers[i] == myid) { if (i < path->length - 1) { return path->peers[i+1]; } else { return myid; } } } return 0; } /** * Get the cost of the path. * @param path The path to analyze * @return Number of hops to reach destination, UINT_MAX in case the peer is not * in the path */ static unsigned int get_path_cost(struct MeshPath *path) { unsigned int i; if (NULL == path) return UINT_MAX; for (i = 0; i < path->length; i++) { if (path->peers[i] == myid) { return path->length - i; } } return UINT_MAX; } /** * 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. */ static void add_path_to_peer(struct MeshPeerInfo *peer_info, struct MeshPath *path) { unsigned int i; unsigned int new_cost; unsigned int best_cost; struct MeshPath *aux; struct MeshPath *best; if (NULL == peer_info || NULL == path) return; new_cost = get_path_cost(path); best_cost = UINT_MAX; best = NULL; for (aux = peer_info->path; aux != NULL; aux = aux->next) { if ((i = get_path_cost(aux)) < best_cost) { best = aux; best_cost = i; } } if (best_cost < new_cost) { path->in_use = 0; GNUNET_CONTAINER_DLL_insert_tail(peer_info->path, peer_info->path_tail, path); } else { if (NULL != best) best->in_use = 0; path->in_use = 1; GNUNET_CONTAINER_DLL_insert(peer_info->path, peer_info->path_tail, path); } return; } /** * Add the path to the peer and update the path used to reach it in case this * is the shortest. The path is given in reverse, the destination peer is * path[0]. The function modifies the path, inverting it to use the origin as * destination. * @param peer_info Destination peer to add the path to. * @param path New path to add. First peer must be the peer in arg 1. */ static void add_path_to_origin(struct MeshPeerInfo *peer_info, struct MeshPath *path) { GNUNET_PEER_Id aux; unsigned int i; for (i = 0; i < path->length/2; i++) { aux = path->peers[i]; path->peers[i] = path->peers[path->length - i - 1]; path->peers[path->length - i - 1] = aux; } add_path_to_peer(peer_info, path); } /** * 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 * retrieve_client (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 */ static int is_client_subscribed(uint16_t message_type, struct MeshClient *c) { unsigned int i; for (i = 0; i < c->type_counter; i++) { if (c->types[i] == message_type) return GNUNET_YES; } return GNUNET_NO; } /** * Search for a tunnel among the tunnels for a client * @param client 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 * retrieve_tunnel_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid) { GNUNET_HashCode hash; GNUNET_CRYPTO_hash(&tid, sizeof(MESH_TunnelNumber), &hash); return GNUNET_CONTAINER_multihashmap_get(c->tunnels, &hash); } /** * Search for a tunnel by global ID using PEER_ID * @param pi owner of the tunnel * @param tid global tunnel number * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * retrieve_tunnel_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 * retrieve_tunnel (struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid) { return retrieve_tunnel_by_pi(GNUNET_PEER_search(oid), tid); } /** * Destroy the path and free any allocated resources linked to it * @param t tunnel the path belongs to * @param p the path to destroy * @return GNUNET_OK on success */ static int destroy_path(struct MeshPath *p) { GNUNET_PEER_decrement_rcs(p->peers, p->length); GNUNET_free(p->peers); GNUNET_free(p); return GNUNET_OK; } #if LATER /** * Destroy the peer_info and free any allocated resources linked to it * @param t tunnel the path belongs to * @param pi the peer_info to destroy * @return GNUNET_OK on success */ static int destroy_peer_info(struct MeshPeerInfo *pi) { GNUNET_HashCode hash; struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve(pi->id, &id); GNUNET_PEER_change_rc(pi->id, -1); GNUNET_CRYPTO_hash(&id, sizeof(struct GNUNET_PeerIdentity), &hash); GNUNET_CONTAINER_multihashmap_remove(peers, &hash, pi); GNUNET_free(pi); return GNUNET_OK; } #endif /** * Destroy the tunnel and free any allocated resources linked to it * @param c client the tunnel belongs to * @param t the tunnel to destroy * @return GNUNET_OK on success */ static int destroy_tunnel(struct MeshTunnel *t) { struct MeshClient *c; GNUNET_HashCode hash; int r; if (NULL == t) return GNUNET_OK; c = t->client; GNUNET_CRYPTO_hash(&t->id, sizeof(struct MESH_TunnelID), &hash); if(GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove(tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_CRYPTO_hash(&t->local_tid, sizeof(MESH_TunnelNumber), &hash); if(GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove(c->tunnels, &hash, t)) { r = GNUNET_SYSERR; } GNUNET_free(t); return r; } /******************************************************************************/ /**************** MESH NETWORK HANDLER HELPERS ***********************/ /******************************************************************************/ /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_create_path_for_peer (void *cls, size_t size, void *buf) { struct MeshPeerInfo *peer_info = cls; struct GNUNET_MESH_ManipulatePath *msg; struct MeshPath *p; struct GNUNET_PeerIdentity *peer_ptr; struct GNUNET_PeerIdentity id; size_t size_needed; int i; if (0 == size && NULL == buf) { GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Retransmitting create path\n"); GNUNET_PEER_resolve(get_first_hop(peer_info->path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, sizeof(struct GNUNET_MESH_ManipulatePath) + (peer_info->path->length * sizeof (struct GNUNET_PeerIdentity)), &send_core_create_path_for_peer, peer_info); return 0; } p = peer_info->path; while (NULL != p) { if (p->in_use) { break; } p = p->next; } if (p == NULL) return 0; // TODO Notify ERROR Path not found size_needed = sizeof(struct GNUNET_MESH_ManipulatePath) + p->length * sizeof(struct GNUNET_PeerIdentity); if (size < size_needed) { // TODO retry? cancel? return 0; } msg = (struct GNUNET_MESH_ManipulatePath *) buf; msg->header.size = htons(size_needed); msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE); peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1]; for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve(p->peers[i], peer_ptr++); } peer_info->state = MESH_PEER_WAITING; return size_needed; } /** * FIXME / COMMENT * There are several options to send a "data to origin" or similar packet. * The core callback function needs to know at least: ID of tunnel and the * data itself, so one parameter (cls) is not enough. * 1. Build the message inside the original funtction, call core_ntfy_trnsmt_rdy * passing the created message as cls * - # memcpy: 2 (function X: to message struct, callback: from cls to buf) * - Very messy, original function becomes huge and ugly * (see "handle_mesh_path_create" for example) * 2. Create a helper function to build the packet, then call * core_ntfy_trnsmt_rdy with message as cls. * - # memcpy: 2 (in helper function data->msg and in callback cls->buf) * 3- Define new container, pass container with pointers * - # memcpy = 1 (in callback, cls->buf) * - Noise: extra containers defined per type of message */ struct info_for_data_to_origin { struct MESH_TunnelID *origin; void *data; size_t 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 (info_for_data_to_origin with all info to build packet) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_data_to_origin (void *cls, size_t size, void *buf) { struct info_for_data_to_origin *info = cls; struct GNUNET_MESH_DataMessageToOrigin *msg = buf; size_t total_size; GNUNET_assert(NULL != info); total_size = sizeof(struct GNUNET_MESH_DataMessageToOrigin) + info->size; GNUNET_assert(total_size < (uint16_t) -1); /* FIXME */ if (total_size > size) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "not enough buffer to send data to origin\n"); return 0; } msg->header.size = htons(total_size); msg->header.type = htons(GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN); GNUNET_PEER_resolve(info->origin->oid, &msg->oid); msg->tid = htonl(info->origin->tid); if (0 != info->size && NULL != info->data) { memcpy(&msg[1], info->data, info->size); } GNUNET_free(info); return total_size; } /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (data itself) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_data_raw (void *cls, size_t size, void *buf) { struct GNUNET_MessageHeader *msg = cls; size_t total_size; GNUNET_assert(NULL != msg); total_size = ntohs(msg->size); if (total_size > size) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "not enough buffer to send data futher\n"); return 0; } memcpy(msg, buf, total_size); return total_size; } #if LATER /** * Function called to notify a client about the socket * being ready to queue more data. "buf" will be * NULL and "size" zero if the socket was closed for * writing in the meantime. * * @param cls closure (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 GNUNET_MESH_DataMessageFromOrigin *msg = cls; size_t total_size; GNUNET_assert(NULL != msg); total_size = ntohs(msg->header.size); if (total_size > size) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "not enough buffer to send data futher\n"); return 0; } memcpy(msg, buf, 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 (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_to_peer (void *cls, size_t size, void *buf) { struct info_for_data_to_origin *info = cls; struct GNUNET_MESH_DataMessageToOrigin *msg = buf; size_t total_size; GNUNET_assert(NULL != info); total_size = sizeof(struct GNUNET_MESH_DataMessageToOrigin) + info->size; /* FIXME better constant? short >= 16 bits, not == 16 bits... */ GNUNET_assert(total_size < USHRT_MAX); if (total_size > size) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "not enough buffer to send data to origin\n"); return 0; } msg->header.size = htons(total_size); msg->header.type = htons(GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN); GNUNET_PEER_resolve(info->origin->oid, &msg->oid); msg->tid = htonl(info->origin->tid); if (0 != info->size && NULL != info->data) { memcpy(&msg[1], info->data, info->size); } GNUNET_free(info); return total_size; } /** * Send another peer a notification to destroy a tunnel * @param cls The tunnel to destroy * @param size Size in the buffer * @param buf Memory where to put the data to transmit * @return Size of data put in buffer */ static size_t send_p2p_tunnel_destroy(void *cls, size_t size, void *buf) { struct MeshTunnel *t = cls; struct MeshClient *c; struct GNUNET_MESH_TunnelMessage *msg; c = t->client; msg = buf; msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); /*FIXME*/ msg->header.size = htons(sizeof(struct GNUNET_MESH_TunnelMessage)); msg->tunnel_id = htonl(t->id.tid); destroy_tunnel(c, t); return sizeof(struct GNUNET_MESH_TunnelMessage); } #endif /** * Function called to notify a client about the socket * begin 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 */ size_t send_client_raw (void *cls, size_t size, void *buf) { struct GNUNET_MessageHeader *msg = cls; size_t msg_size; msg_size = ntohs(msg->size); if (msg_size > size) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "deliver to client failed: buffer too small\n"); return 0; } memcpy(buf, cls, msg_size); return msg_size; } /** * Iterator over hash map peer entries to resend a data packet to all peers * down the tunnel. * * @param cls closure (original message) * @param key current key code (peer id hash) * @param value value in the hash map (peer_info) * @return GNUNET_YES if we should continue to iterate, GNUNET_NO if not. */ static int iterate_resend_multicast (void *cls, const GNUNET_HashCode * key, void *value) { struct GNUNET_MESH_DataMessageMulticast *msg = cls; struct GNUNET_PeerIdentity id; struct MeshPeerInfo *peer_info = value; if (peer_info->id == myid) { // TODO retransmit to interested clients return GNUNET_YES; } GNUNET_PEER_resolve(get_first_hop(peer_info->path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, ntohs(msg->header.size), &send_core_data_raw, msg); return GNUNET_YES; } /******************************************************************************/ /******************** MESH NETWORK HANDLERS **************************/ /******************************************************************************/ /** * Core handler for path creation * struct GNUNET_CORE_MessageHandler * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) * */ static int handle_mesh_path_create (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { unsigned int own_pos; uint16_t size; uint16_t i; MESH_TunnelNumber tid; struct GNUNET_MESH_ManipulatePath *msg; struct GNUNET_PeerIdentity *pi; struct GNUNET_PeerIdentity id; GNUNET_HashCode hash; struct MeshPath *path; struct MeshPeerInfo *dest_peer_info; struct MeshPeerInfo *orig_peer_info; struct MeshTunnel *t; size = ntohs(message->size); if (size < sizeof(struct GNUNET_MESH_ManipulatePath)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "received create path message too short\n"); return GNUNET_OK; } size -= sizeof(struct GNUNET_MESH_ManipulatePath); if (size < 2 * sizeof(struct GNUNET_PeerIdentity)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "create path message lacks enough peers\n"); return GNUNET_OK; } if (size % sizeof(struct GNUNET_PeerIdentity)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "create path message of wrong size\n"); return GNUNET_OK; } msg = (struct GNUNET_MESH_ManipulatePath *) message; size /= sizeof(struct GNUNET_PeerIdentity); tid = ntohl(msg->tid); pi = (struct GNUNET_PeerIdentity *) &msg[1]; t = retrieve_tunnel(pi, tid); if (NULL == t) { t = GNUNET_malloc(sizeof(struct MeshTunnel)); t->id.oid = GNUNET_PEER_intern(pi); t->id.tid = tid; t->local_tid = 0; t->client = NULL; t->peers = GNUNET_CONTAINER_multihashmap_create(32); GNUNET_CRYPTO_hash(&t->id, sizeof(struct MESH_TunnelID), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put(tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "create path: could not store tunnel in hashmap\n"); return GNUNET_OK; } } dest_peer_info = GNUNET_CONTAINER_multihashmap_get(peers, &pi[size - 1].hashPubKey); if (NULL == dest_peer_info) { dest_peer_info = GNUNET_malloc(sizeof(struct MeshPeerInfo)); dest_peer_info->id = GNUNET_PEER_intern(&pi[size - 1]); dest_peer_info->state = MESH_PEER_WAITING; GNUNET_CONTAINER_multihashmap_put(peers, &pi[size - 1].hashPubKey, dest_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } orig_peer_info = GNUNET_CONTAINER_multihashmap_get(peers, &pi->hashPubKey); if (NULL == orig_peer_info) { orig_peer_info = GNUNET_malloc(sizeof(struct MeshPeerInfo)); orig_peer_info->id = GNUNET_PEER_intern(pi); orig_peer_info->state = MESH_PEER_WAITING; GNUNET_CONTAINER_multihashmap_put(peers, &pi->hashPubKey, orig_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } path = GNUNET_malloc(sizeof(struct MeshPath)); path->length = size; path->peers = GNUNET_malloc(size * sizeof(GNUNET_PEER_Id)); own_pos = 0; for (i = 0; i < size; i++) { path->peers[i] = GNUNET_PEER_intern(&pi[i]); if (path->peers[i] == myid) own_pos = i; } if (own_pos == 0) { /* cannot be self, must be 'not found' */ GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "create path: self not found in path through self\n"); destroy_path(path); /* FIXME error. destroy tunnel? leave for timeout? */ return 0; } if (own_pos == size - 1) { /* it is for us! */ add_path_to_origin(orig_peer_info, path); /* inverts path! */ GNUNET_PEER_resolve(get_first_hop(path), &id); /* path is inverted :) */ /* FIXME / COMMENT * is it allowed/desired to declare variables this way? * (style, best practices, etc) * This variable is short lived and completely irrelevant for the rest * of the function */ struct info_for_data_to_origin *info = GNUNET_malloc(sizeof(struct info_for_data_to_origin)); info->origin = &t->id; info->data = NULL; info->size = 0; GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, sizeof(struct GNUNET_MessageHeader), &send_core_data_to_origin, info); } else { add_path_to_peer(dest_peer_info, path); GNUNET_PEER_resolve(get_first_hop(path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, sizeof(struct GNUNET_MessageHeader), &send_core_create_path_for_peer, dest_peer_info); } return GNUNET_OK; } /** * Core handler for mesh network traffic going from the origin to a peer * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_unicast (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_DataMessageFromOrigin *msg; struct GNUNET_PeerIdentity id; struct MeshTunnel *t; struct MeshPeerInfo *pi; struct MeshClient *c; size_t size; uint16_t payload_type; size = ntohs(message->size); if (size < sizeof(struct GNUNET_MESH_DataMessageFromOrigin)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "got data from origin packet: too short\n"); return GNUNET_OK; // FIXME maybe SYSERR? peer misbehaving? } msg = (struct GNUNET_MESH_DataMessageFromOrigin *) message; t = retrieve_tunnel(&msg->oid, ntohl(msg->tid)); if (NULL == t) { /* TODO: are we so nice that we try to send it to OID anyway? We *could* * know how to reach it, from the global peer hashmap */ return GNUNET_OK; } pi = GNUNET_CONTAINER_multihashmap_get(t->peers, &msg->destination.hashPubKey); if (NULL == pi) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "got invalid data from origin packet: wrong destination\n"); /* TODO are we so nice to try to deliver it anyway? maybe we missed * a Create_Path packet that added the peer but we have it in the * _global_ peer pool anyway... */ return GNUNET_OK; } if (pi->id == myid) { payload_type = ntohs(msg[1].header.type); for (c = clients; NULL != c; c = c->next) { if (is_client_subscribed(payload_type, c)) { GNUNET_SERVER_notify_transmit_ready(c->handle, size - sizeof(struct GNUNET_MESH_DataMessageFromOrigin), GNUNET_TIME_UNIT_FOREVER_REL, send_client_raw, &msg[1]); } } return GNUNET_OK; } GNUNET_PEER_resolve(get_first_hop(pi->path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, size, &send_core_data_raw, msg); return GNUNET_OK; } /** * Core handler for mesh network traffic going from the origin to all peers * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_multicast (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_DataMessageMulticast *msg; struct MeshTunnel *t; size_t size; size = ntohs(message->size); if (size < sizeof(struct GNUNET_MESH_DataMessageMulticast)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "got multicast packet: too short\n"); return GNUNET_OK; // FIXME maybe SYSERR? peer misbehaving? } msg = (struct GNUNET_MESH_DataMessageMulticast *) message; t = retrieve_tunnel(&msg->oid, ntohl(msg->tid)); if (NULL == t) { return GNUNET_OK; } GNUNET_CONTAINER_multihashmap_iterate(t->peers, &iterate_resend_multicast, msg); return GNUNET_OK; } /** * Core handler for mesh network traffic * * @param cls closure * @param message message * @param peer peer identity this notification is about * @param atsi performance data * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { struct GNUNET_MESH_DataMessageToOrigin *msg; struct GNUNET_PeerIdentity id; struct MeshTunnel *t; struct MeshPeerInfo *peer_info; size_t size; size = ntohs(message->size); if (size < sizeof(struct GNUNET_MESH_DataMessageToOrigin)) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "got invalid data to origin packet: too short\n"); return GNUNET_OK; // FIXME maybe SYSERR? peer misbehaving? } msg = (struct GNUNET_MESH_DataMessageToOrigin *) message; t = retrieve_tunnel(&msg->oid, ntohl(msg->tid)); if (NULL == t) { /* TODO: are we so nice that we try to send it to OID anyway? We *could* * know how to reach it, from the global peer hashmap */ return GNUNET_OK; } if (t->id.oid == myid) { if (NULL == t->client) { GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "got data packet for ownerless tunnel\n"); return GNUNET_OK; } // TODO retransmit to client owner return GNUNET_OK; } peer_info = get_peer_info(&msg->oid); if (NULL == peer_info) { GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "unknown origin of tunnel\n"); return GNUNET_OK; } GNUNET_PEER_resolve(get_first_hop(peer_info->path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, size, &send_core_data_raw, msg); return GNUNET_OK; } /** * Functions to handle messages from core */ static struct GNUNET_CORE_MessageHandler core_handlers[] = { {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0}, {&handle_mesh_data_unicast, GNUNET_MESSAGE_TYPE_DATA_MESSAGE_FROM_ORIGIN, 0}, {&handle_mesh_data_multicast, GNUNET_MESSAGE_TYPE_DATA_MULTICAST, 0}, {&handle_mesh_data_to_orig, GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN, 0}, {NULL, 0, 0} }; /******************************************************************************/ /**************** MESH LOCAL HANDLER HELPERS ***********************/ /******************************************************************************/ /** * delete_tunnel_entry: iterator for deleting each tunnel that belongs to a * client when the client disconnects. * @param cls closure (client that is disconnecting) * @param key the hash of the local tunnel id (used to access the hashmap) * @param value the value stored at the key (tunnel to destroy) * @return GNUNET_OK on success */ static int delete_tunnel_entry (void *cls, const GNUNET_HashCode * key, void *value) { int r; r = destroy_tunnel((struct MeshTunnel *) value); return r; } #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 unused * @param tc unused */ static void path_refresh (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshPeerInfo *peer_info = cls; struct GNUNET_PeerIdentity id; if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN) return; GNUNET_PEER_resolve(get_first_hop(peer_info->path), &id); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &id, sizeof(struct GNUNET_MESH_ManipulatePath) + (peer_info->path->length * sizeof (struct GNUNET_PeerIdentity)), &send_core_create_path_for_peer, peer_info); return; } /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param get_path NULL-terminated array of pointers * to the peers on reverse GET path (or NULL if not recorded) * @param put_path NULL-terminated array of pointers * to the peers on the PUT path (or NULL if not recorded) * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data */ static void dht_get_response_handler(void *cls, struct GNUNET_TIME_Absolute exp, const GNUNET_HashCode * key, const struct GNUNET_PeerIdentity * const *get_path, const struct GNUNET_PeerIdentity * const *put_path, enum GNUNET_BLOCK_Type type, size_t size, const void *data) { struct MeshPeerInfo *peer_info = cls; struct MeshPath *p; struct GNUNET_PeerIdentity pi; int i; if ((NULL == get_path || NULL == put_path) && NULL == peer_info->path) { // Find ourselves some alternate initial path to the destination: retry GNUNET_DHT_get_stop(peer_info->dhtget); GNUNET_PEER_resolve(peer_info->id, &pi); peer_info->dhtget = GNUNET_DHT_get_start(dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_ANY, &pi.hashPubKey, 4, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */ 0, /* mutator */ NULL, /* xquery */ 0, /* xquery bits */ dht_get_response_handler, (void *)peer_info); } p = GNUNET_malloc(sizeof(struct MeshPath)); for (i = 0; get_path[i] != NULL; i++); for (i--; i >= 0; i--) { p->peers = GNUNET_realloc(p->peers, sizeof(GNUNET_PEER_Id) * (p->length + 1)); p->peers[p->length] = GNUNET_PEER_intern(get_path[i]); p->length++; } for (i = 0; put_path[i] != NULL; i++); for (i--; i >= 0; i--) { p->peers = GNUNET_realloc(p->peers, sizeof(GNUNET_PEER_Id) * (p->length + 1)); p->peers[p->length] = GNUNET_PEER_intern(put_path[i]); p->length++; } add_path_to_peer(peer_info, p); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, get_path[1], sizeof(struct GNUNET_MESH_ManipulatePath) + (p->length * sizeof (struct GNUNET_PeerIdentity)), &send_core_create_path_for_peer, peer_info); GNUNET_SCHEDULER_add_delayed(REFRESH_PATH_TIME, &path_refresh, peer_info); return; } /******************************************************************************/ /********************* 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_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client) { struct MeshClient *c; struct MeshClient *next; GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "client disconnected\n"); c = clients; while (NULL != c) { if (c->handle == client) { GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, " matching client found, cleaning\n"); GNUNET_CONTAINER_multihashmap_iterate(c->tunnels, &delete_tunnel_entry, c); GNUNET_CONTAINER_multihashmap_destroy(c->tunnels); if(0 != c->app_counter) GNUNET_free (c->apps); if(0 != c->type_counter) GNUNET_free (c->types); GNUNET_CONTAINER_DLL_remove(clients, clients_tail, c); next = c->next; GNUNET_free (c); c = next; } else { GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, " ... searching\n"); 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; unsigned int size; uint16_t types; uint16_t apps; 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; types = ntohs(cc_msg->types); apps = ntohs(cc_msg->applications); if (size != types * sizeof(uint16_t) + apps * 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->handle = client; if (types != 0) { c->type_counter = types; c->types = GNUNET_malloc(types * sizeof(uint16_t)); memcpy(c->types, &message[1], types * sizeof(uint16_t)); } if (apps != 0) { c->app_counter = apps; c->apps = GNUNET_malloc(apps * sizeof(GNUNET_MESH_ApplicationType)); memcpy(c->apps, &message[1] + types * sizeof(uint16_t), apps * sizeof(GNUNET_MESH_ApplicationType)); } GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, " client has %u+%u subscriptions\n", c->type_counter, c->app_counter); GNUNET_CONTAINER_DLL_insert(clients, clients_tail, c); c->tunnels = GNUNET_CONTAINER_multihashmap_create(32); GNUNET_SERVER_receive_done(client, GNUNET_OK); } /** * 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; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(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; } t_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Sanity check for tunnel numbering */ if (0 == (ntohl(t_msg->tunnel_id) & GNUNET_MESH_LOCAL_TUNNEL_ID_MARK)) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Sanity check for duplicate tunnel IDs */ if(NULL != retrieve_tunnel_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 != retrieve_tunnel_by_pi(myid, next_tid)) next_tid = (next_tid + 1) % GNUNET_MESH_LOCAL_TUNNEL_ID_MARK; t->id.tid = next_tid++; t->id.oid = myid; t->local_tid = ntohl(t_msg->tunnel_id); t->client = c; t->peers = GNUNET_CONTAINER_multihashmap_create(32); GNUNET_CRYPTO_hash(&t->local_tid, sizeof(MESH_TunnelNumber), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put(c->tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } GNUNET_CRYPTO_hash(&t->id, sizeof(struct MESH_TunnelID), &hash); if (GNUNET_OK != GNUNET_CONTAINER_multihashmap_put(tunnels, &hash, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } GNUNET_SERVER_receive_done(client, GNUNET_OK); return; } /** * Handler for requests of deleting tunnels * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelMessage *tunnel_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; GNUNET_HashCode hash; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(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; } tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Retrieve tunnel */ tid = ntohl(tunnel_msg->tunnel_id); /* Remove from local id hashmap */ GNUNET_CRYPTO_hash(&tid, sizeof(MESH_TunnelNumber), &hash); t = GNUNET_CONTAINER_multihashmap_get(c->tunnels, &hash); GNUNET_CONTAINER_multihashmap_remove(c->tunnels, &hash, t); /* Remove from global id hashmap */ GNUNET_CRYPTO_hash(&t->id, sizeof(struct MESH_TunnelID), &hash); GNUNET_CONTAINER_multihashmap_remove(tunnels, &hash, t); // notify_tunnel_destroy(t); GNUNET_SERVER_receive_done(client, GNUNET_OK); return; } /** * Handler for connection requests to new peers * * @param cls closure * @param client identification of the client * @param message the actual message (PeerControl) */ static void handle_local_connect_add (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PeerControl *peer_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; struct MeshPeerInfo *peer_info; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(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 = retrieve_tunnel_by_local_id(c, tid); if (NULL == t) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } t->peers_total++; peer_info = get_peer_info(&peer_msg->peer); /* Start DHT search if needed */ if(MESH_PEER_READY != peer_info->state && NULL == peer_info->dhtget) { peer_info->dhtget = GNUNET_DHT_get_start(dht_handle, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_BLOCK_TYPE_ANY, &peer_msg->peer.hashPubKey, 4, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE, NULL, /* bloom filter */ 0, /* mutator */ NULL, /* xquery */ 0, /* xquery bits */ dht_get_response_handler, (void *)peer_info); } GNUNET_SERVER_receive_done(client, GNUNET_OK); return; } /** * Handler for disconnection requests of peers in a tunnel * * @param cls closure * @param client identification of the client * @param message the actual message (PeerControl) */ static void handle_local_connect_del (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PeerControl *peer_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(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 = retrieve_tunnel_by_local_id(c, tid); if (NULL == t) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Ok, delete peer from tunnel */ GNUNET_CONTAINER_multihashmap_remove_all(t->peers, &peer_msg->peer.hashPubKey); GNUNET_SERVER_receive_done(client, GNUNET_OK); return; } /** * Handler for connection requests to new peers by type * * @param cls closure * @param client identification of the client * @param message the actual message (ConnectPeerByType) */ static void handle_local_connect_by_type (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_ConnectPeerByType *connect_msg; MESH_TunnelNumber tid; GNUNET_MESH_ApplicationType application; struct MeshClient *c; struct MeshTunnel *t; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(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_PeerControl) != 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 = retrieve_tunnel_by_local_id(c, tid); if (NULL == t) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Ok, lets find a peer offering the service */ application = ntohl(connect_msg->type); application++; // FIXME silence warnings 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_network_traffic (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct MeshClient *c; struct MeshTunnel *t; struct MeshPeerInfo *pi; struct GNUNET_MESH_Data *data_msg; struct GNUNET_PeerIdentity next_hop; MESH_TunnelNumber tid; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(client))) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } data_msg = (struct GNUNET_MESH_Data *)message; /* Sanity check for message size */ if (sizeof(struct GNUNET_MESH_PeerControl) != ntohs(data_msg->header.size)) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl(data_msg->tunnel_id); t = retrieve_tunnel_by_local_id(c, tid); if (NULL == t) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Is it a local tunnel? Then, does client own the tunnel? */ if (t->client->handle != NULL && t->client->handle != client) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } pi = GNUNET_CONTAINER_multihashmap_get(t->peers, &data_msg->peer_id.hashPubKey); /* Is the selected peer in the tunnel? */ if (NULL == pi) { /* TODO * Are we SO nice that we automatically try to add him to the tunnel? */ GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } GNUNET_PEER_resolve(get_first_hop(pi->path), &next_hop); GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &next_hop, /* FIXME re-check types */ message->size - sizeof(struct GNUNET_MESH_Data) + sizeof(struct GNUNET_MESH_DataMessageFromOrigin), &send_core_data_to_origin, /* FIXME re-check */ NULL); GNUNET_SERVER_receive_done(client, GNUNET_OK); /* FIXME not yet */ 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_network_traffic_bcast (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct MeshClient *c; struct MeshTunnel *t; struct GNUNET_MESH_DataBroadcast *data_msg; MESH_TunnelNumber tid; /* Sanity check for client registration */ if (NULL == (c = retrieve_client(client))) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } data_msg = (struct GNUNET_MESH_DataBroadcast *)message; /* Sanity check for message size */ if (sizeof(struct GNUNET_MESH_PeerControl) != ntohs(data_msg->header.size)) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl(data_msg->tunnel_id); t = retrieve_tunnel_by_local_id(c, tid); if (NULL == t) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* Does client own tunnel? */ if (t->client->handle != client) { GNUNET_break(0); GNUNET_SERVER_receive_done(client, GNUNET_SYSERR); return; } /* TODO */ GNUNET_SERVER_receive_done(client, GNUNET_OK); return; } /** * Functions to handle messages from clients */ static struct GNUNET_SERVER_MessageHandler plugin_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_CONNECT_PEER_ADD, sizeof(struct GNUNET_MESH_PeerControl)}, {&handle_local_connect_del, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_DEL, sizeof(struct GNUNET_MESH_PeerControl)}, {&handle_local_connect_by_type, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_BY_TYPE, sizeof(struct GNUNET_MESH_ConnectPeerByType)}, {&handle_local_network_traffic, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0}, {&handle_local_network_traffic_bcast, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA_BROADCAST, 0}, {NULL, NULL, 0, 0} }; /** * To be called on core init/fail. * * @param cls service closure * @param server handle to the server for this service * @param identity the public identity of this peer * @param publicKey the public key of this peer */ static void core_init (void *cls, struct GNUNET_CORE_Handle *server, const struct GNUNET_PeerIdentity *identity, const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *publicKey) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n"); core_handle = server; myid = GNUNET_PEER_intern(identity); return; } /** * Method called whenever a given peer connects. * * @param cls closure * @param peer peer identity this notification is about * @param atsi performance data for the connection */ static void core_connect (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { // GNUNET_PEER_Id pid; struct MeshPeerInfo *peer_info; struct MeshPath *path; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer connected\n"); peer_info = get_peer_info(peer); if (myid == peer_info->id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (self)\n"); } path = GNUNET_malloc(sizeof(struct MeshPath)); path->length = 2; path->peers = GNUNET_malloc(sizeof(GNUNET_PEER_Id) * 2); path->peers[0] = myid; path->peers[1] = peer_info->id; add_path_to_peer(peer_info, path); return; } /** * Method called whenever a peer disconnects. * * @param cls closure * @param peer peer identity this notification is about */ static void core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer) { GNUNET_PEER_Id pid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peer disconnected\n"); pid = GNUNET_PEER_search(peer); if (myid == pid) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (self)\n"); } return; } /******************************************************************************/ /************************ MAIN FUNCTIONS ****************************/ /******************************************************************************/ /** * Task run during shutdown. * * @param cls unused * @param tc unused */ static void shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n"); if (core_handle != NULL) { GNUNET_CORE_disconnect (core_handle); core_handle = NULL; } if (dht_handle != NULL) { GNUNET_DHT_disconnect (dht_handle); dht_handle = NULL; } 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) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n"); GNUNET_SERVER_add_handlers (server, plugin_handlers); GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL); core_handle = GNUNET_CORE_connect (c, /* Main configuration */ 1, /* queue size */ NULL, /* Closure passed to MESH functions */ &core_init, /* Call core_init once connected */ &core_connect, /* Handle connects */ &core_disconnect, /* remove peers on disconnects */ NULL, /* Do we care about "status" updates? */ NULL, /* Don't notify about all incoming messages */ GNUNET_NO, /* For header only in notification */ NULL, /* Don't notify about all outbound messages */ GNUNET_NO, /* For header-only out notification */ core_handlers); /* Register these handlers */ if (core_handle == NULL) { GNUNET_break(0); } dht_handle = GNUNET_DHT_connect(c, 64); if (dht_handle == NULL) { GNUNET_break(0); } next_tid = 0; tunnels = GNUNET_CONTAINER_multihashmap_create(32); peers = GNUNET_CONTAINER_multihashmap_create(32); clients = NULL; clients_tail = NULL; /* 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 if 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; ret = (GNUNET_OK == GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run, NULL)) ? 0 : 1; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "end of main()\n"); return ret; }