X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=src%2Fmesh%2Fgnunet-service-mesh.c;h=df4f39eedb11e99d0eefb58212093ed010a06136;hb=0b81657b642457b7e15414ded2f66b33ce6835c2;hp=8332100b678d668fa54ab5b0556cb99855051d61;hpb=587be81e064a15e2e42eb297ef8161f7352abcf8;p=oweals%2Fgnunet.git diff --git a/src/mesh/gnunet-service-mesh.c b/src/mesh/gnunet-service-mesh.c index 8332100b6..df4f39eed 100644 --- a/src/mesh/gnunet-service-mesh.c +++ b/src/mesh/gnunet-service-mesh.c @@ -23,12 +23,22 @@ * @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: - * - soft stateing (keep-alive (CHANGE?) / timeout / disconnect) -- not a message issue * - 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" @@ -37,349 +47,666 @@ #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) /******************************************************************************/ -/******************** MESH NETWORK MESSAGES **************************/ +/************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** - * Message for mesh path management + * Information regarding a path */ -struct GNUNET_MESH_ManipulatePath +struct MeshPath { - /** - * Type: GNUNET_MESSAGE_TYPE_MESH_PATH_[CREATE|CHANGE|ADD|DEL] - * - * Size: sizeof(struct GNUNET_MESH_ManipulatePath) + path_length * sizeof (struct GNUNET_PeerIdentity) - */ - struct GNUNET_MessageHeader header; /** - * (global) Id of the tunnel this path belongs to, unique in conjunction with the origin. + * Linked list */ - uint32_t tid GNUNET_PACKED; + struct MeshPath *next; + struct MeshPath *prev; /** - * Information about speed requirements. If the tunnel cannot sustain the - * minimum bandwidth, packets are to be dropped. + * Whether the path is serving traffic in a tunnel or is a backup */ - uint32_t speed_min GNUNET_PACKED; + int in_use; /** - * 64-bit alignment. + * List of all the peers that form the path from origin to target */ - uint32_t reserved GNUNET_PACKED; + GNUNET_PEER_Id *peers; /** - * path_length structs defining the *whole* path from the origin [0] to the - * final destination [path_length-1]. + * Number of peers (hops) in the path */ - // struct GNUNET_PeerIdentity peers[path_length]; + unsigned int length; }; + /** - * Message for mesh data traffic to all tunnel targets. + * All the states a peer participating in a tunnel can be in. */ -struct GNUNET_MESH_OriginMulticast +enum MeshPeerState { /** - * Type: GNUNET_MESSAGE_TYPE_DATA_MULTICAST + * Path to the peer not known yet */ - struct GNUNET_MessageHeader header; + MESH_PEER_SEARCHING, /** - * TID of the tunnel + * Request sent, not yet answered. */ - uint32_t tid GNUNET_PACKED; + MESH_PEER_WAITING, /** - * OID of the tunnel + * Peer connected and ready to accept data */ - struct GNUNET_PeerIdentity oid; + MESH_PEER_READY, /** - * Payload follows + * Peer connected previosly but not responding */ + MESH_PEER_RECONNECTING }; /** - * Message for mesh data traffic to a particular destination from origin. + * Struct containing all information regarding a given peer */ -struct GNUNET_MESH_DataMessageFromOrigin +struct MeshPeerInfo { /** - * Type: GNUNET_MESSAGE_TYPE_DATA_MESSAGE_FROM_ORIGIN + * ID of the peer */ - struct GNUNET_MessageHeader header; + GNUNET_PEER_Id id; /** - * TID of the tunnel + * Is the peer reachable? Is the peer even connected? */ - uint32_t tid GNUNET_PACKED; + enum MeshPeerState state; /** - * OID of the tunnel + * Last time we heard from this peer */ - struct GNUNET_PeerIdentity oid; + struct GNUNET_TIME_Absolute last_contact; /** - * Destination. + * Number of attempts to reconnect so far */ - struct GNUNET_PeerIdentity destination; + int n_reconnect_attempts; /** - * Payload follows + * 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; }; /** - * Message for mesh data traffic from a tunnel participant to origin. + * Data scheduled to transmit (to local client or remote peer) */ -struct GNUNET_MESH_DataMessageToOrigin +struct MeshQueue { /** - * Type: GNUNET_MESSAGE_TYPE_DATA_MESSAGE_TO_ORIGIN - */ - struct GNUNET_MessageHeader header; - - /** - * TID of the tunnel + * Double linked list */ - uint32_t tid GNUNET_PACKED; + struct MeshQueue *next; + struct MeshQueue *prev; /** - * OID of the tunnel + * Target of the data (NULL if target is client) */ - struct GNUNET_PeerIdentity oid; + struct MeshPeerInfo *peer; /** - * Sender of the message. + * Client to send the data to (NULL if target is peer) */ - struct GNUNET_PeerIdentity sender; + struct MeshClient *client; /** - * Payload follows + * Size of the message to transmit */ -}; + unsigned int size; -/** - * Message for mesh flow control - */ -struct GNUNET_MESH_SpeedNotify -{ /** - * Type: GNUNET_MESSAGE_TYPE_DATA_SPEED_NOTIFY + * How old is the data? */ - struct GNUNET_MessageHeader header; + struct GNUNET_TIME_Absolute timestamp; /** - * TID of the tunnel + * Data itself */ - uint32_t tid GNUNET_PACKED; + struct GNUNET_MessageHeader *data; +}; +/** + * Globally unique tunnel identification (owner + number) + * DO NOT USE OVER THE NETWORK + */ +struct MESH_TunnelID { /** - * OID of the tunnel + * Node that owns the tunnel */ - struct GNUNET_PeerIdentity oid; + GNUNET_PEER_Id oid; /** - * Slowest link down the path (above minimum speed requirement). + * Tunnel number to differentiate all the tunnels owned by the node oid + * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_MARK ) */ - uint32_t speed_min; - + MESH_TunnelNumber tid; }; -/******************************************************************************/ -/************************ DATA STRUCTURES ****************************/ -/******************************************************************************/ +struct MeshClient; /* FWD declaration */ /** - * All the states a peer participating in a tunnel can be in. + * 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 */ -enum PeerState +struct MeshTunnel { /** - * Request sent, not yet answered. + * Tunnel ID */ - MESH_PEER_WAITING, + struct MESH_TunnelID id; /** - * Peer connected and ready to accept data + * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_MARK or 0 ) */ - MESH_PEER_READY, + MESH_TunnelNumber local_tid; /** - * Peer connected previosly but not responding + * Last time the tunnel was used */ - MESH_PEER_UNAVAILABLE, + struct GNUNET_TIME_Absolute timestamp; /** - * Peer requested but not ever connected + * Peers in the tunnelindexed by PeerIdentity (MeshPeerInfo) */ - MESH_PEER_UNREACHABLE -}; + struct GNUNET_CONTAINER_MultiHashMap* peers; -/** - * Struct containing all information regarding a given peer - */ -struct PeerInfo -{ /** - * ID of the peer + * Number of peers that are connected and potentially ready to receive data */ - GNUNET_PEER_Id id; + unsigned int peers_ready; /** - * Is the peer reachable? Is the peer even connected? + * Number of peers that have been added to the tunnel */ - enum PeerState state; + unsigned int peers_total; + /** - * Who to send the data to --- what about multiple (alternate) paths? + * Client owner of the tunnel, if any */ - GNUNET_PEER_Id first_hop; + struct MeshClient *client; /** - * Max data rate to this peer + * Messages ready to transmit */ - uint32_t max_speed; + struct MeshQueue *queue_head; + struct MeshQueue *queue_tail; + }; /** - * Information regarding a path + * Struct containing information about a client of the service */ -struct Path +struct MeshClient { /** - * Id of the path, in case it's needed + * Linked list */ - uint32_t id; + struct MeshClient *next; + struct MeshClient *prev; /** - * Whether the path is serving traffic in a tunnel or is a backup + * Tunnels that belong to this client, indexed by local id */ - int in_use; + struct GNUNET_CONTAINER_MultiHashMap* tunnels; /** - * List of all the peers that form the path from origin to target + * Handle to communicate with the client + */ + struct GNUNET_SERVER_Client *handle; + + /** + * Applications that this client has claimed to provide */ - GNUNET_PEER_Id *peers; + 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 ****************************/ +/******************************************************************************/ + /** - * Struct containing all information regarding a tunnel - * For an intermediate node the improtant info used will be: - * - OID \ To identify - * - TID / the tunnel - * - paths[0] | To know where to send it next - * - metainfo: ready, speeds, accounting - * For an end node more fields will be needed (client-handling) + * All the clients */ -struct MESH_tunnel +static struct MeshClient *clients; +static struct MeshClient *clients_tail; + +/** + * Tunnels known, indexed by MESH_TunnelID (MeshTunnel) + */ +struct GNUNET_CONTAINER_MultiHashMap *tunnels; + +/** + * Peers known, indexed by PeerIdentity (MeshPeerInfo) + */ +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; + } - struct MESH_tunnel *next; + return peer_info; +} - struct MESH_tunnel *prev; +/** + * 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; + + if (NULL == path) return 0; + if (path->in_use == 0) 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; +} - /** - * Origin ID: Node that created the tunnel - */ - GNUNET_PEER_Id oid; - /** - * Tunnel number (unique for a given oid) - */ - uint32_t tid; +/** + * 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; - /** - * Whether the tunnel is in a state to transmit data - */ - int ready; + 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; +} - /** - * Minimal speed for this tunnel in kb/s - */ - uint32_t speed_min; - /** - * Maximal speed for this tunnel in kb/s - */ - uint32_t speed_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; +} - /** - * Last time the tunnel was used - */ - struct GNUNET_TIME_Absolute timestamp; - /** - * Peers in the tunnel, for future optimizations - */ - struct PeerInfo *peers; +/** + * 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; - /** - * Paths (used and backup) - */ - struct Path *paths; + c = clients; + while (NULL != c) { + if (c->handle == client) return c; + c = c->next; + } + return NULL; +} - /** - * Messages ready to transmit??? -- real queues needed - */ - struct GNUNET_MessageHeader *msg_out; - /** - * Messages received and not processed??? -- real queues needed - */ - struct GNUNET_MessageHeader *msg_in; +/** + * 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; - /** - * If this tunnel was created by a local client, what's its handle? - */ - struct GNUNET_SERVER_Client *initiator; -}; + GNUNET_CRYPTO_hash(&tid, sizeof(MESH_TunnelNumber), &hash); + return GNUNET_CONTAINER_multihashmap_get(c->tunnels, &hash); +} /** - * So, I'm an endpoint. Why am I receiveing traffic? - * Who is interested in this? How to communicate with them? + * 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 */ -struct Client +static struct MeshTunnel * +retrieve_tunnel_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid) { + struct MESH_TunnelID id; + GNUNET_HashCode hash; - struct Client *next; + id.oid = pi; + id.tid = tid; - struct Client *prev; + GNUNET_CRYPTO_hash(&id, sizeof(struct MESH_TunnelID), &hash); + return GNUNET_CONTAINER_multihashmap_get(tunnels, &hash); +} - struct MESH_tunnel *my_tunnels_head; - struct MESH_tunnel *my_tunnels_tail; - /** - * If this tunnel was created by a local client, what's its handle? - */ - struct GNUNET_SERVER_Client *handle; +/** + * 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) +{ + GNUNET_PEER_Id pi; - unsigned int messages_subscribed_counter; + pi = GNUNET_PEER_intern(oid); + GNUNET_PEER_change_rc(pi, -1); + return retrieve_tunnel_by_pi(pi, tid); +} - uint16_t *messages_subscribed; -}; +/** + * 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; -// static struct MESH_tunnel *tunnel_participation_head; + GNUNET_PEER_resolve(pi->id, &id); + GNUNET_PEER_change_rc(pi->id, -1); + GNUNET_CRYPTO_hash(&id, sizeof(struct GNUNET_PeerIdentity), &hash); -// static struct MESH_tunnel *tunnel_participation_tail; + 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 MeshPath *path; + 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; // TODO maybe already ready? + + return size_needed; +} + +#if LATER +/** + * Send another peer a notification to destroy a tunnel + * @param cls The tunnel to destroy + * @param size Size in the buffer + * @param buf Memory where to put the data to transmit + * @return Size of data put in buffer + */ +static size_t +send_p2p_tunnel_destroy(void *cls, size_t size, void *buf) +{ + struct MeshTunnel *t = cls; + struct MeshClient *c; + struct GNUNET_MESH_TunnelMessage *msg; + + c = t->client; + msg = buf; + msg->header.type = htons(GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); /*FIXME*/ + msg->header.size = htons(sizeof(struct GNUNET_MESH_TunnelMessage)); + msg->tunnel_id = htonl(t->id.tid); + + destroy_tunnel(c, t); + return sizeof(struct GNUNET_MESH_TunnelMessage); +} +#endif /******************************************************************************/ /******************** MESH NETWORK HANDLERS **************************/ /******************************************************************************/ + /** * Core handler for path creation * struct GNUNET_CORE_MessageHandler @@ -399,36 +726,102 @@ handle_mesh_path_create (void *cls, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { - /* - * EXAMPLE OF USING THE API - * NOT ACTUAL CODE!!!!! - */ - /*client *c; - tunnel *t; - - t = new; - GNUNET_CONTAINER_DLL_insert (c->my_tunnels_head, - c->my_tunnels_tail, - t); + 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 MeshPath *path; + struct MeshPeerInfo *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; + } - while (NULL != (t = c->my_tunnels_head)) - { - GNUNET_CONTAINER_DLL_remove (c->my_tunnels_head, - c->my_tunnels_tail, - t); - GNUNET_free (t); + 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; + } + } + peer_info = GNUNET_CONTAINER_multihashmap_get(peers, + &pi[size - 1].hashPubKey); + if (NULL == peer_info) { + peer_info = GNUNET_malloc(sizeof(struct MeshPeerInfo)); + peer_info->id = GNUNET_PEER_intern(&pi[size - 1]); + peer_info->state = MESH_PEER_WAITING; + GNUNET_CONTAINER_multihashmap_put(peers, + &pi[size - 1].hashPubKey, + peer_info, + GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); + } - /* Extract path */ - /* Find origin & self */ - /* Search for origin in local tunnels */ - /* Create tunnel / add path */ - /* Retransmit to next link in chain, if any (core_notify + callback) */ + 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 destroy tunnel? leave for timeout? */ + return 0; + } + if (own_pos == size - 1) { /* it is for us! */ + destroy_path(path); /* not needed anymore */ + /* TODO: send ack? new meesage type? */ + } else { + add_path_to_peer(peer_info, path); + /* TODO: Retransmit to next link in chain, if any (core_notify + callback) */ + } return GNUNET_OK; } + /** * Core handler for mesh network traffic * @@ -446,7 +839,7 @@ handle_mesh_network_traffic (void *cls, const struct GNUNET_TRANSPORT_ATS_Information *atsi) { - if(GNUNET_MESSAGE_TYPE_MESH_DATA_GO == ntohs(message->type)) { + if (GNUNET_MESSAGE_TYPE_MESH_DATA_GO == ntohs(message->type)) { /* Retransmit to next in path of tunnel identified by message */ return GNUNET_OK; } else { /* GNUNET_MESSAGE_TYPE_MESH_DATA_BACK */ @@ -455,6 +848,7 @@ handle_mesh_network_traffic (void *cls, } } + /** * Functions to handle messages from core */ @@ -467,10 +861,178 @@ static struct GNUNET_CORE_MessageHandler core_handlers[] = { +/******************************************************************************/ +/**************** 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 * @@ -481,10 +1043,38 @@ static struct GNUNET_CORE_MessageHandler core_handlers[] = { static void handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client) { - /* Remove client from list, delete all timers and queues associated */ + 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 * @@ -497,26 +1087,386 @@ 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 connection requests + * Handler for requests of deleting tunnels * * @param cls closure * @param client identification of the client * @param message the actual message */ static void -handle_local_connect (void *cls, - struct GNUNET_SERVER_Client *client, - const struct GNUNET_MessageHeader *message) +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 client traffic + * 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; + GNUNET_PEER_Id peer_id; + + /* 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 */ + peer_id = GNUNET_PEER_intern(&peer_msg->peer); + + /* FIXME Delete paths */ + /* FIXME Delete peer info */ + + GNUNET_PEER_change_rc(peer_id, -1); + + 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 @@ -527,37 +1477,128 @@ handle_local_network_traffic (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { + struct MeshClient *c; + struct MeshTunnel *t; + struct GNUNET_MESH_Data *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_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; + } + + /* 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 + * 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 */ -/* MESSAGES DEFINED: -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT 272 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ANY 273 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ALL 274 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ADD 275 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_DEL 276 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_BY_TYPE 277 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_CANCEL 278 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_TRANSMIT_READY 279 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATED 280 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROYED 281 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA 282 -#define GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA_BROADCAST 283 +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_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ANY, 0}, - {&handle_local_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ALL, 0}, - {&handle_local_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_ADD, 0}, - {&handle_local_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_DEL, 0}, - {&handle_local_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_BY_TYPE, sizeof(struct GNUNET_MESH_ConnectPeerByType)}, - {&handle_local_connect, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT_PEER_CANCEL, 0}, - {&handle_local_network_traffic, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_TRANSMIT_READY, 0}, - {&handle_local_network_traffic, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0}, /* FIXME needed? */ - {&handle_local_network_traffic, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA_BROADCAST, 0}, /* FIXME needed? */ + {&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} }; @@ -576,6 +1617,10 @@ core_init (void *cls, 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; } @@ -591,6 +1636,23 @@ 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; } @@ -605,11 +1667,48 @@ 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_intern(peer); + GNUNET_PEER_change_rc(pid, -1); + 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. FIXME NON FUNCTIONAL, SKELETON + * Process mesh requests. * * @param cls closure * @param server the initialized server @@ -620,25 +1719,42 @@ run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *c) { - struct GNUNET_CORE_Handle *core; - - GNUNET_SERVER_add_handlers (server, plugin_handlers); - GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL); - core = GNUNET_CORE_connect (c, /* Main configuration */ - 32, /* 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 want notified about all incoming messages */ - GNUNET_NO, /* For header only inbound notification */ - NULL, /* Don't want notified about all outbound messages */ - GNUNET_NO, /* For header only outbound notification */ + 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; - if (core == NULL) - return; + 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"); } /** @@ -651,12 +1767,15 @@ run (void *cls, 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; - return ret; + 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; }