/* This file is part of GNUnet. (C) 2001-2013 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 * * FIXME in progress: * - when sending in-order buffered data, wait for client ACKs * * TODO: * - relay corking down to core * - set ttl relative to path length * - add signatures * - add encryption * TODO END */ #include "platform.h" #include "mesh.h" #include "mesh_protocol.h" #include "mesh_path.h" #include "block_mesh.h" #include "gnunet_dht_service.h" #include "gnunet_statistics_service.h" #define MESH_BLOOM_SIZE 128 #define MESH_DEBUG_DHT GNUNET_NO #define MESH_DEBUG_CONNECTION GNUNET_NO #define MESH_DEBUG_TIMING __LINUX__ && GNUNET_NO #define MESH_MAX_POLL_TIME GNUNET_TIME_relative_multiply (\ GNUNET_TIME_UNIT_MINUTES,\ 10) #define MESH_RETRANSMIT_TIME GNUNET_TIME_UNIT_SECONDS #define MESH_RETRANSMIT_MARGIN 4 #if MESH_DEBUG_CONNECTION #define DEBUG_CONN(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) #else #define DEBUG_CONN(...) #endif #if MESH_DEBUG_DHT #define DEBUG_DHT(...) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, __VA_ARGS__) #else #define DEBUG_DHT(...) #endif #if MESH_DEBUG_TIMING #include double __sum; uint64_t __count; struct timespec __mesh_start; struct timespec __mesh_end; #define INTERVAL_START clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_start)) #define INTERVAL_END \ do {\ clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &(__mesh_end));\ double __diff = __mesh_end.tv_nsec - __mesh_start.tv_nsec;\ if (__diff < 0) __diff += 1000000000;\ __sum += __diff;\ __count++;\ } while (0) #define INTERVAL_SHOW \ if (0 < __count)\ GNUNET_log (GNUNET_ERROR_TYPE_INFO, "AVG process time: %f ns\n", __sum/__count) #else #define INTERVAL_START #define INTERVAL_END #define INTERVAL_SHOW #endif /******************************************************************************/ /************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** FWD declaration */ struct MeshPeer; struct MeshClient; /** * Struct containing info about a queued transmission to this peer */ struct MeshPeerQueue { /** * DLL next */ struct MeshPeerQueue *next; /** * DLL previous */ struct MeshPeerQueue *prev; /** * Peer this transmission is directed to. */ struct MeshPeer *peer; /** * Tunnel this message belongs to. */ struct MeshTunnel *tunnel; /** * Pointer to info stucture used as cls. */ void *cls; /** * Type of message */ uint16_t type; /** * Size of the message */ size_t size; }; /** * Struct containing all information regarding a given peer */ struct MeshPeer { /** * ID of the peer */ GNUNET_PEER_Id id; /** * Last time we heard from this peer */ struct GNUNET_TIME_Absolute last_contact; /** * Number of attempts to reconnect so far */ int n_reconnect_attempts; /** * Paths to reach the peer, ordered by ascending hop count */ struct MeshPeerPath *path_head; /** * Paths to reach the peer, ordered by ascending hop count */ struct MeshPeerPath *path_tail; /** * Handle to stop the DHT search for a path to this peer */ struct GNUNET_DHT_GetHandle *dhtget; /** * Array of tunnels this peer is the target of. * Most probably a small amount, therefore not a hashmap. * When the path to the peer changes, notify these tunnels to let them * re-adjust their path trees. */ struct MeshTunnel **tunnels; /** * Number of tunnels this peers participates in */ unsigned int ntunnels; /** * Transmission queue to core DLL head */ struct MeshPeerQueue *queue_head; /** * Transmission queue to core DLL tail */ struct MeshPeerQueue *queue_tail; /** * How many messages are in the queue to this peer. */ unsigned int queue_n; /** * Handle for queued transmissions */ struct GNUNET_CORE_TransmitHandle *core_transmit; }; /** * Struct to encapsulate all the Flow Control information to a peer in the * context of a tunnel: Same peer in different tunnels will have independent * flow control structures, allowing to choke/free tunnels according to its * own criteria. */ struct MeshFlowControl { /** * ID of the last packet sent towards the peer. */ uint32_t last_pid_sent; /** * ID of the last packet received from the peer. */ uint32_t last_pid_recv; /** * Last ACK sent to the peer (peer can't send more than this PID). */ uint32_t last_ack_sent; /** * Last ACK sent towards the origin (for traffic towards leaf node). */ uint32_t last_ack_recv; /** * How many payload messages are in the queue towards this peer. */ uint32_t queue_n; /** * Task to poll the peer in case of a lost ACK causes stall. */ GNUNET_SCHEDULER_TaskIdentifier poll_task; /** * How frequently to poll for ACKs. */ struct GNUNET_TIME_Relative poll_time; /** * On which tunnel to poll. * Using an explicit poll_ctx would not help memory wise, * since the allocated context would have to be stored in the * fc struct in order to free it upon cancelling poll_task. */ struct MeshTunnel *t; }; /** * Globally unique tunnel identification (owner + number) * DO NOT USE OVER THE NETWORK */ struct MESH_TunnelID { /** * Node that owns the tunnel */ GNUNET_PEER_Id oid; /** * Tunnel number to differentiate all the tunnels owned by the node oid * ( tid < GNUNET_MESH_LOCAL_TUNNEL_ID_CLI ) */ MESH_TunnelNumber tid; }; /** * Data needed for reliable tunnel endpoint retransmission management. */ struct MeshTunnelReliability; /** * Info needed to retry a message in case it gets lost. */ struct MeshReliableMessage { /** * Double linked list, FIFO style */ struct MeshReliableMessage *next; struct MeshReliableMessage *prev; /** * Tunnel Reliability queue this message is in. */ struct MeshTunnelReliability *rel; /** * ID of the message (ACK needed to free) */ uint32_t mid; /** * When was this message issued (to calculate ACK delay) */ struct GNUNET_TIME_Absolute timestamp; /* struct GNUNET_MESH_Data with payload */ }; struct MeshTunnelReliability { /** * Tunnel this is about. */ struct MeshTunnel *t; /** * DLL of messages sent and not yet ACK'd. */ struct MeshReliableMessage *head_sent; struct MeshReliableMessage *tail_sent; /** * Messages pending */ unsigned int n_sent; /** * Next MID to use. */ uint32_t mid_sent; /** * DLL of messages received out of order. */ struct MeshReliableMessage *head_recv; struct MeshReliableMessage *tail_recv; /** * Next MID expected. */ uint32_t mid_recv; /** * Task to resend/poll in case no ACK is received. */ GNUNET_SCHEDULER_TaskIdentifier retry_task; /** * Counter for exponential backoff. */ struct GNUNET_TIME_Relative retry_timer; /** * How long does it usually take to get an ACK. */ struct GNUNET_TIME_Relative expected_delay; }; /** * 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; /** * Port of the tunnel. */ uint32_t port; /** * State of the tunnel. */ enum MeshTunnelState state; /** * Local tunnel number ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI or 0 ) */ MESH_TunnelNumber local_tid; /** * Local tunnel number for local destination clients (incoming number) * ( >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV or 0). All clients share the same * number. */ MESH_TunnelNumber local_tid_dest; /** * Is the tunnel bufferless (minimum latency)? */ int nobuffer; /** * Is the tunnel reliable? */ int reliable; /** * Force sending ACK? Flag to allow duplicate ACK on POLL. */ int force_ack; /** * How many messages do we accept in the forward queue. */ unsigned int queue_max; /** * Last time the tunnel was used */ struct GNUNET_TIME_Absolute timestamp; /** * Destination of the tunnel. */ GNUNET_PEER_Id dest; /** * Next hop in the tunnel. If 0, @c client must be set. */ GNUNET_PEER_Id next_hop; /** * Previous hop in the tunnel. If 0, @c owner must be set. */ GNUNET_PEER_Id prev_hop; /** * Flow control information about @c next_hop or @c client. */ struct MeshFlowControl next_fc; /** * Flow control information about @c prev_hop or @c owner. */ struct MeshFlowControl prev_fc; /** * Client owner of the tunnel, if any */ struct MeshClient *owner; /** * Client destination of the tunnel, if any. */ struct MeshClient *client; /** * Task to keep the used paths alive at the owner, * time tunnel out on all the other peers. */ GNUNET_SCHEDULER_TaskIdentifier fwd_maintenance_task; /** * Task to keep the used paths alive at the destination, * time tunnel out on all the other peers. */ GNUNET_SCHEDULER_TaskIdentifier bck_maintenance_task; /** * Path being used for the tunnel. */ struct MeshPeerPath *path; /** * Flag to signal the destruction of the tunnel. * If this is set GNUNET_YES the tunnel will be destroyed * when the queue is empty. */ int destroy; /** * Total messages pending for this tunnels, payload or not. */ unsigned int pending_messages; /** * Reliability data. * Only present (non-NULL) at the owner of a tunnel. */ struct MeshTunnelReliability *fwd_rel; /** * Reliability data. * Only present (non-NULL) at the destination of a tunnel. */ struct MeshTunnelReliability *bck_rel; }; /** * Struct containing information about a client of the service * * TODO: add a list of 'waiting' ports */ struct MeshClient { /** * Linked list next */ struct MeshClient *next; /** * Linked list prev */ struct MeshClient *prev; /** * Tunnels that belong to this client, indexed by local id */ struct GNUNET_CONTAINER_MultiHashMap32 *own_tunnels; /** * Tunnels this client has accepted, indexed by incoming local id */ struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels; /** * Handle to communicate with the client */ struct GNUNET_SERVER_Client *handle; /** * Ports that this client has declared interest in. * Indexed by port, contains *Client. */ struct GNUNET_CONTAINER_MultiHashMap32 *ports; /** * Whether the client is active or shutting down (don't send confirmations * to a client that is shutting down. */ int shutting_down; /** * ID of the client, mainly for debug messages */ unsigned int id; }; /******************************************************************************/ /************************ DEBUG FUNCTIONS ****************************/ /******************************************************************************/ #if MESH_DEBUG /** * GNUNET_SCHEDULER_Task for printing a message after some operation is done * @param cls string to print * @param success GNUNET_OK if the PUT was transmitted, * GNUNET_NO on timeout, * GNUNET_SYSERR on disconnect from service * after the PUT message was transmitted * (so we don't know if it was received or not) */ #if 0 static void mesh_debug (void *cls, int success) { char *s = cls; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%s (%d)\n", s, success); } #endif #endif /******************************************************************************/ /*********************** GLOBAL VARIABLES ****************************/ /******************************************************************************/ /************************** Configuration parameters **************************/ /** * How often to send tunnel keepalives. Tunnels timeout after 4 missed. */ static struct GNUNET_TIME_Relative refresh_path_time; /** * How often to PUT own ID in the DHT. */ static struct GNUNET_TIME_Relative id_announce_time; /** * Maximum time allowed to connect to a peer found by string. */ static struct GNUNET_TIME_Relative connect_timeout; /** * Default TTL for payload packets. */ static unsigned long long default_ttl; /** * DHT replication level, see DHT API: GNUNET_DHT_get_start, GNUNET_DHT_put. */ static unsigned long long dht_replication_level; /** * How many tunnels are we willing to maintain. * Local tunnels are always allowed, even if there are more tunnels than max. */ static unsigned long long max_tunnels; /** * How many messages *in total* are we willing to queue, divided by number of * tunnels to get tunnel queue size. */ static unsigned long long max_msgs_queue; /** * How many peers do we want to remember? */ static unsigned long long max_peers; /** * Percentage of messages that will be dropped (for test purposes only). */ static unsigned long long drop_percent; /*************************** Static global variables **************************/ /** * DLL with all the clients, head. */ static struct MeshClient *clients_head; /** * DLL with all the clients, tail. */ static struct MeshClient *clients_tail; /** * Tunnels known, indexed by MESH_TunnelID (MeshTunnel). */ static struct GNUNET_CONTAINER_MultiHashMap *tunnels; /** * Number of tunnels known. */ static unsigned long long n_tunnels; /** * Tunnels incoming, indexed by MESH_TunnelNumber * (which is greater than GNUNET_MESH_LOCAL_TUNNEL_ID_SERV). */ static struct GNUNET_CONTAINER_MultiHashMap32 *incoming_tunnels; /** * Peers known, indexed by PeerIdentity (MeshPeer). */ static struct GNUNET_CONTAINER_MultiPeerMap *peers; /* * Handle to communicate with transport */ // static struct GNUNET_TRANSPORT_Handle *transport_handle; /** * Handle to communicate with core. */ static struct GNUNET_CORE_Handle *core_handle; /** * Handle to use DHT. */ static struct GNUNET_DHT_Handle *dht_handle; /** * Handle to server. */ static struct GNUNET_SERVER_Handle *server_handle; /** * Handle to the statistics service. */ static struct GNUNET_STATISTICS_Handle *stats; /** * Notification context, to send messages to local clients. */ static struct GNUNET_SERVER_NotificationContext *nc; /** * Local peer own ID (memory efficient handle). */ static GNUNET_PEER_Id myid; /** * Local peer own ID (full value). */ static struct GNUNET_PeerIdentity my_full_id; /** * Own private key. */ static struct GNUNET_CRYPTO_EccPrivateKey *my_private_key; /** * Tunnel ID for the next created tunnel (global tunnel number). */ static MESH_TunnelNumber next_tid; /** * Tunnel ID for the next incoming tunnel (local tunnel number). */ static MESH_TunnelNumber next_local_tid; /** * All ports clients of this peer have opened. */ static struct GNUNET_CONTAINER_MultiHashMap32 *ports; /** * Task to periodically announce itself in the network. */ GNUNET_SCHEDULER_TaskIdentifier announce_id_task; /** * Next ID to assign to a client. */ unsigned int next_client_id; /******************************************************************************/ /*********************** DECLARATIONS **************************/ /******************************************************************************/ /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data */ static void dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode * key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data); /** * Retrieve the MeshPeer stucture associated with the peer, create one * and insert it in the appropriate structures if the peer is not known yet. * * @param peer Full identity of the peer. * * @return Existing or newly created peer info. */ static struct MeshPeer * peer_get (const struct GNUNET_PeerIdentity *peer); /** * Retrieve the MeshPeer stucture associated with the peer, create one * and insert it in the appropriate structures if the peer is not known yet. * * @param peer Short identity of the peer. * * @return Existing or newly created peer info. */ static struct MeshPeer * peer_get_short (const GNUNET_PEER_Id peer); /** * Build a PeerPath from the paths returned from the DHT, reversing the paths * to obtain a local peer -> destination path and interning the peer ids. * * @return Newly allocated and created path */ static struct MeshPeerPath * path_build_from_dht (const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length); /** * Adds a path to the peer_infos of all the peers in the path * * @param p Path to process. * @param confirmed Whether we know if the path works or not. */ static void path_add_to_peers (struct MeshPeerPath *p, int confirmed); /** * Search for a tunnel by global ID using full PeerIdentities. * * @param oid owner of the tunnel. * @param tid global tunnel number. * * @return tunnel handler, NULL if doesn't exist. */ static struct MeshTunnel * tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid); /** * Change the tunnel state. * * @param t Tunnel whose ttate to change. * @param state New state. */ static void tunnel_change_state (struct MeshTunnel *t, enum MeshTunnelState state); /** * Notify a tunnel that a connection has broken that affects at least * some of its peers. * * @param t Tunnel affected. * @param p1 Peer that got disconnected from p2. * @param p2 Peer that got disconnected from p1. * * @return Short ID of the peer disconnected (either p1 or p2). * 0 if the tunnel remained unaffected. */ static GNUNET_PEER_Id tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2); /** * Send FWD keepalive packets for a tunnel. * * @param cls Closure (tunnel for which to send the keepalive). * @param tc Notification context. */ static void tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * Send BCK keepalive packets for a tunnel. * * @param cls Closure (tunnel for which to send the keepalive). * @param tc Notification context. */ static void tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * @brief Use the given path for the tunnel. * Update the next and prev hops (and RCs). * (Re)start the path refresh in case the tunnel is locally owned. * * @param t Tunnel to update. * @param p Path to use. */ static void tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p); /** * Tunnel is empty: destroy it. * * Notifies all participants (peers, cleints) about the destruction. * * @param t Tunnel to destroy. */ static void tunnel_destroy_empty (struct MeshTunnel *t); /** * Destroy the tunnel. * * This function does not generate any warning traffic to clients or peers. * * Tasks: * Remove the tunnel from peer_info's and clients' hashmaps. * Cancel messages belonging to this tunnel queued to neighbors. * Free any allocated resources linked to the tunnel. * * @param t the tunnel to destroy * * @return GNUNET_OK on success */ static int tunnel_destroy (struct MeshTunnel *t); /** * @brief Queue and pass message to core when possible. * * If type is payload (UNICAST, TO_ORIGIN, MULTICAST) checks for queue status * and accounts for it. In case the queue is full, the message is dropped and * a break issued. * * Otherwise, message is treated as internal and allowed to go regardless of * queue status. * * @param cls Closure (@c type dependant). It will be used by queue_send to * build the message to be sent if not already prebuilt. * @param type Type of the message, 0 for a raw message. * @param size Size of the message. * @param dst Neighbor to send message to. * @param t Tunnel this message belongs to. */ static void queue_add (void *cls, uint16_t type, size_t size, struct MeshPeer *dst, struct MeshTunnel *t); /** * Free a transmission that was already queued with all resources * associated to the request. * * @param queue Queue handler to cancel. * @param clear_cls Is it necessary to free associated cls? */ static void queue_destroy (struct MeshPeerQueue *queue, int clear_cls); /** * @brief Get the next transmittable message from the queue. * * This will be the head, except in the case of being a data packet * not allowed by the destination peer. * * @param peer Destination peer. * * @return The next viable MeshPeerQueue element to send to that peer. * NULL when there are no transmittable messages. */ struct MeshPeerQueue * queue_get_next (const struct MeshPeer *peer); /** * Core callback to write a queued packet to core buffer * * @param cls Closure (peer info). * @param size Number of bytes available in buf. * @param buf Where the to write the message. * * @return number of bytes written to buf */ static size_t queue_send (void *cls, size_t size, void *buf); /** * Dummy function to separate declarations from definitions in function list. */ void __mesh_divider______________________________________________________________(); static const char * GNUNET_MESH_DEBUG_S2S (enum MeshTunnelState s) { static char buf[128]; switch (s) { /** * Uninitialized status, should never appear in operation. */ case MESH_TUNNEL_NEW: return "MESH_TUNNEL_NEW"; /** * Path to the peer not known yet */ case MESH_TUNNEL_SEARCHING: return "MESH_TUNNEL_SEARCHING"; /** * Request sent, not yet answered. */ case MESH_TUNNEL_WAITING: return "MESH_TUNNEL_WAITING"; /** * Peer connected and ready to accept data */ case MESH_TUNNEL_READY: return "MESH_TUNNEL_READY"; /** * Peer connected previosly but not responding */ case MESH_TUNNEL_RECONNECTING: return "MESH_TUNNEL_RECONNECTING"; default: sprintf (buf, "%u (UNKNOWN STATE)", s); return buf; } } /******************************************************************************/ /************************ PERIODIC FUNCTIONS ****************************/ /******************************************************************************/ /** * Periodically announce self id in the DHT * * @param cls closure * @param tc task context */ static void announce_id (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct PBlock block; struct GNUNET_HashCode phash; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) { announce_id_task = GNUNET_SCHEDULER_NO_TASK; return; } /* TODO * - Set data expiration in function of X * - Adapt X to churn */ DEBUG_DHT ("DHT_put for ID %s started.\n", GNUNET_i2s (&my_full_id)); GNUNET_CRYPTO_hash (&my_full_id, sizeof (my_full_id), &phash); block.id = my_full_id; GNUNET_DHT_put (dht_handle, /* DHT handle */ &phash, dht_replication_level, /* Replication level */ GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, /* DHT options */ GNUNET_BLOCK_TYPE_MESH_PEER, /* Block type */ sizeof (block), /* Size of the data */ (const char *) &block, /* Data itself */ GNUNET_TIME_UNIT_FOREVER_ABS, /* Data expiration */ GNUNET_TIME_UNIT_FOREVER_REL, /* Retry time */ NULL, /* Continuation */ NULL); /* Continuation closure */ announce_id_task = GNUNET_SCHEDULER_add_delayed (id_announce_time, &announce_id, cls); } /******************************************************************************/ /****************** GENERAL HELPER FUNCTIONS ************************/ /******************************************************************************/ /** * Check if client has registered with the service and has not disconnected * * @param client the client to check * * @return non-NULL if client exists in the global DLL */ static struct MeshClient * client_get (struct GNUNET_SERVER_Client *client) { return GNUNET_SERVER_client_get_user_context (client, struct MeshClient); } /** * Deletes a tunnel from a client (either owner or destination). To be used on * tunnel destroy. * * @param c Client whose tunnel to delete. * @param t Tunnel which should be deleted. */ static void client_delete_tunnel (struct MeshClient *c, struct MeshTunnel *t) { int res; if (c == t->owner) { res = GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t); if (GNUNET_YES != res) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel owner KO\n"); } if (c == t->client) { res = GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels, t->local_tid_dest, t); if (GNUNET_YES != res) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client_delete_tunnel client KO\n"); } } /** * Notify the appropriate client that a new incoming tunnel was created. * * @param t Tunnel that was created. */ static void send_local_tunnel_create (struct MeshTunnel *t) { struct GNUNET_MESH_TunnelMessage msg; if (NULL == t->client) return; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); msg.tunnel_id = htonl (t->local_tid_dest); msg.port = htonl (t->port); msg.opt = 0; msg.opt |= GNUNET_YES == t->reliable ? GNUNET_MESH_OPTION_RELIABLE : 0; msg.opt |= GNUNET_YES == t->nobuffer ? GNUNET_MESH_OPTION_NOBUFFER : 0; msg.opt = htonl (msg.opt); GNUNET_PEER_resolve (t->id.oid, &msg.peer); GNUNET_SERVER_notification_context_unicast (nc, t->client->handle, &msg.header, GNUNET_NO); } /** * Notify a client that the incoming tunnel is no longer valid. * * @param t Tunnel that is destroyed. * @param fwd Forward notification (owner->dest)? */ static void send_local_tunnel_destroy (struct MeshTunnel *t, int fwd) { struct GNUNET_MESH_TunnelMessage msg; struct MeshClient *c; c = fwd ? t->client : t->owner; if (NULL == c) { GNUNET_break (0); return; } msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); msg.tunnel_id = htonl (fwd ? t->local_tid_dest : t->local_tid); msg.port = htonl (0); memset (&msg.peer, 0, sizeof (msg.peer)); msg.opt = htonl (0); GNUNET_SERVER_notification_context_unicast (nc, c->handle, &msg.header, GNUNET_NO); } /** * Build a local ACK message and send it to a local client. * * @param t Tunnel on which to send the ACK. * @param c Client to whom send the ACK. * @param is_fwd Set to GNUNET_YES for FWD ACK (dest->owner) */ static void send_local_ack (struct MeshTunnel *t, struct MeshClient *c, int is_fwd) { struct GNUNET_MESH_LocalAck msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); msg.tunnel_id = htonl (is_fwd ? t->local_tid : t->local_tid_dest); GNUNET_SERVER_notification_context_unicast (nc, c->handle, &msg.header, GNUNET_NO); } /** * Sends an already built message to a peer, properly registrating * all used resources. * * @param message Message to send. Function makes a copy of it. * @param peer Short ID of the neighbor whom to send the message. * @param t Tunnel on which this message is transmitted. */ static void send_prebuilt_message (const struct GNUNET_MessageHeader *message, GNUNET_PEER_Id peer, struct MeshTunnel *t) { struct GNUNET_PeerIdentity id; struct MeshPeer *neighbor; struct MeshPeerPath *p; void *data; size_t size; uint16_t type; // GNUNET_TRANSPORT_try_connect(); FIXME use? if (0 == peer) return; size = ntohs (message->size); data = GNUNET_malloc (size); memcpy (data, message, size); type = ntohs(message->type); if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type || GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type) { struct GNUNET_MESH_Data *u; u = (struct GNUNET_MESH_Data *) data; u->ttl = htonl (ntohl (u->ttl) - 1); } GNUNET_PEER_resolve (peer, &id); neighbor = peer_get (&id); for (p = neighbor->path_head; NULL != p; p = p->next) { if (2 >= p->length) { break; } } if (NULL == p) { #if MESH_DEBUG GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %s IS NOT DIRECTLY CONNECTED\n", GNUNET_i2s(&id)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PATHS TO %s:\n", GNUNET_i2s(&id)); for (p = neighbor->path_head; NULL != p; p = p->next) { struct GNUNET_PeerIdentity debug_id; unsigned int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path with %u hops through:\n", p->length); for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve(p->peers[i], &debug_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " hop %u: %s\n", i, GNUNET_i2s(&debug_id)); } } #endif GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " no direct connection to %s\n", GNUNET_i2s (&id)); GNUNET_free (data); return; } if (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK == type) type = 0; queue_add (data, type, size, neighbor, t); } /** * Sends a CREATE PATH message for a path to a peer, properly registrating * all used resources. * * @param t Tunnel for which the path is created. */ static void send_path_create (struct MeshTunnel *t) { struct MeshPeer *neighbor; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send create path\n"); neighbor = peer_get_short (t->next_hop); queue_add (t, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, sizeof (struct GNUNET_MESH_CreateTunnel) + (t->path->length * sizeof (struct GNUNET_PeerIdentity)), neighbor, t); tunnel_change_state (t, MESH_TUNNEL_WAITING); } /** * Sends a PATH ACK message in reponse to a received PATH_CREATE directed to us. * * @param t Tunnel which to confirm. */ static void send_path_ack (struct MeshTunnel *t) { struct MeshPeer *neighbor; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Send path ack\n"); neighbor = peer_get_short (t->prev_hop); queue_add (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, sizeof (struct GNUNET_MESH_PathACK), neighbor, t); tunnel_change_state (t, MESH_TUNNEL_WAITING); } /** * Build an ACK message and queue it to send to the given peer. * * @param t Tunnel on which to send the ACK. * @param peer Peer to whom send the ACK. * @param ack Value of the ACK. */ static void send_ack (struct MeshTunnel *t, GNUNET_PEER_Id peer, uint32_t ack) { struct GNUNET_MESH_ACK msg; GNUNET_PEER_resolve (t->id.oid, &msg.oid); msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_ACK); msg.pid = htonl (ack); msg.tid = htonl (t->id.tid); send_prebuilt_message (&msg.header, peer, t); } /** * Core callback to write a pre-constructed data packet to core buffer * * @param cls Closure (MeshTransmissionDescriptor with data in "data" member). * @param size Number of bytes available in buf. * @param buf Where the to write the message. * * @return number of bytes written to buf */ static size_t send_core_data_raw (void *cls, size_t size, void *buf) { struct GNUNET_MessageHeader *msg = cls; size_t total_size; GNUNET_assert (NULL != msg); total_size = ntohs (msg->size); if (total_size > size) { GNUNET_break (0); return 0; } memcpy (buf, msg, total_size); GNUNET_free (cls); return total_size; } /** * Function to send a create path packet to a peer. * * @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_path_create (void *cls, size_t size, void *buf) { struct MeshTunnel *t = cls; struct GNUNET_MESH_CreateTunnel *msg; struct GNUNET_PeerIdentity *peer_ptr; struct MeshPeerPath *p = t->path; size_t size_needed; uint32_t opt; int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH sending...\n"); size_needed = sizeof (struct GNUNET_MESH_CreateTunnel) + p->length * sizeof (struct GNUNET_PeerIdentity); if (size < size_needed || NULL == buf) { GNUNET_break (0); return 0; } msg = (struct GNUNET_MESH_CreateTunnel *) buf; msg->header.size = htons (size_needed); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE); msg->tid = ntohl (t->id.tid); opt = 0; if (GNUNET_YES == t->nobuffer) opt |= GNUNET_MESH_OPTION_NOBUFFER; if (GNUNET_YES == t->reliable) opt |= GNUNET_MESH_OPTION_RELIABLE; msg->opt = htonl (opt); msg->port = htonl (t->port); peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1]; for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve (p->peers[i], peer_ptr++); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATE PATH (%u bytes long) sent!\n", size_needed); return size_needed; } /** * Creates a path ack message in buf and frees all unused resources. * * @param cls closure (MeshTransmissionDescriptor) * @param size number of bytes available in buf * @param buf where the callee should write the message * @return number of bytes written to buf */ static size_t send_core_path_ack (void *cls, size_t size, void *buf) { struct MeshTunnel *t = cls; struct GNUNET_MESH_PathACK *msg = buf; GNUNET_assert (NULL != t); if (sizeof (struct GNUNET_MESH_PathACK) > size) { GNUNET_break (0); return 0; } t->prev_fc.last_ack_sent = t->nobuffer ? 0 : t->queue_max - 1; msg->header.size = htons (sizeof (struct GNUNET_MESH_PathACK)); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_ACK); GNUNET_PEER_resolve (t->id.oid, &msg->oid); msg->tid = htonl (t->id.tid); msg->peer_id = my_full_id; msg->ack = htonl (t->prev_fc.last_ack_sent); /* TODO add signature */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "PATH ACK sent!\n"); return sizeof (struct GNUNET_MESH_PathACK); } /** * Iterator over all the peers to remove the oldest not-used entry. * * @param cls Closure (unsued). * @param key ID of the peer. * @param value Peer_Info of the peer. * * FIXME implement */ static int peer_timeout (void *cls, const struct GNUNET_PeerIdentity *key, void *value) { return GNUNET_YES; } /** * Retrieve the MeshPeer stucture associated with the peer, create one * and insert it in the appropriate structures if the peer is not known yet. * * @param peer Full identity of the peer. * * @return Existing or newly created peer info. */ static struct MeshPeer * peer_get (const struct GNUNET_PeerIdentity *peer_id) { struct MeshPeer *peer; peer = GNUNET_CONTAINER_multipeermap_get (peers, peer_id); if (NULL == peer) { peer = GNUNET_new (struct MeshPeer); if (GNUNET_CONTAINER_multipeermap_size (peers) > max_peers) { GNUNET_CONTAINER_multipeermap_iterate (peers, &peer_timeout, NULL); } GNUNET_CONTAINER_multipeermap_put (peers, peer_id, peer, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); peer->id = GNUNET_PEER_intern (peer_id); } peer->last_contact = GNUNET_TIME_absolute_get(); return peer; } /** * Retrieve the MeshPeer stucture associated with the peer, create one * and insert it in the appropriate structures if the peer is not known yet. * * @param peer Short identity of the peer. * * @return Existing or newly created peer info. */ static struct MeshPeer * peer_get_short (const GNUNET_PEER_Id peer) { return peer_get (GNUNET_PEER_resolve2 (peer)); } /** * Select which PID to POLL for, to compensate for lost messages. * * @param pi Peer we want to poll. * @param t Tunnel about which we want to poll. * * @return PID to use, either last sent or first_in_queue - 1 */ static uint32_t peer_get_first_payload_pid (struct MeshPeer *p, struct MeshTunnel *t) { struct MeshPeerQueue *q; uint16_t type; type = p->id == t->next_hop ? GNUNET_MESSAGE_TYPE_MESH_UNICAST : GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN; for (q = p->queue_head; NULL != q; q = q->next) { if (q->type == type && q->tunnel == t) { struct GNUNET_MESH_Data *msg = q->cls; /* Pretend that the last one sent was the previous to this */ return ntohl (msg->pid) - 1; } } /* No data in queue, use last sent */ { struct MeshFlowControl *fc; fc = p->id == t->next_hop ? &t->next_fc : &t->prev_fc; return fc->last_pid_sent; } } /** * Choose the best path towards a peer considering the tunnel properties. * * @param peer The destination peer. * @param t The tunnel the path is for. * * @return Best current known path towards the peer, if any. */ static struct MeshPeerPath * peer_get_best_path (const struct MeshPeer *peer, const struct MeshTunnel *t) { struct MeshPeerPath *best_p; struct MeshPeerPath *p; unsigned int best_cost; unsigned int cost; best_p = p = peer->path_head; best_cost = cost = p->length; while (NULL != p) { if ((cost = p->length) < best_cost) { best_cost = cost; best_p = p; } p = p->next; } return best_p; } /** * Try to establish a new connection to this peer in the given tunnel. * If the peer doesn't have any path to it yet, try to get one. * If the peer already has some path, send a CREATE PATH towards it. * * @param peer PeerInfo of the peer. * @param t Tunnel for which to create the path, if possible. */ static void peer_connect (struct MeshPeer *peer, struct MeshTunnel *t) { struct MeshPeerPath *p; struct GNUNET_HashCode phash; if (NULL != peer->path_head) { p = peer_get_best_path (peer, t); tunnel_use_path (t, p); send_path_create (t); } else if (NULL == peer->dhtget) { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer->id, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Starting DHT GET for peer %s\n", GNUNET_i2s (&id)); GNUNET_CRYPTO_hash (&id, sizeof (my_full_id), &phash); peer->dhtget = GNUNET_DHT_get_start (dht_handle, /* handle */ GNUNET_BLOCK_TYPE_MESH_PEER, /* type */ &phash, /* key to search */ dht_replication_level, /* replication level */ GNUNET_DHT_RO_RECORD_ROUTE | GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, NULL, /* xquery */ 0, /* xquery bits */ &dht_get_id_handler, peer); tunnel_change_state (t, MESH_TUNNEL_SEARCHING); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "There is no path but the DHT GET is already started.\n"); } } /** * @brief Re-initiate traffic to this peer if necessary. * * Check if there is traffic queued towards this peer * and the core transmit handle is NULL (traffic was stalled). * If so, call core tmt rdy. * * @param peer_id Short ID of peer to which initiate traffic. */ static void peer_unlock_queue (GNUNET_PEER_Id peer_id) { struct MeshPeer *peer; struct MeshPeerQueue *q; size_t size; peer = peer_get_short (peer_id); if (NULL != peer->core_transmit) return; q = queue_get_next (peer); if (NULL == q) return; size = q->size; peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, 0, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_PEER_resolve2 (peer->id), size, &queue_send, peer); } /** * Cancel all transmissions towards a neighbor that belong to a certain tunnel. * * @param neighbor Short ID of the neighbor to whom cancel the transmissions. * @param t Tunnel which to cancel. */ static void peer_cancel_queues (GNUNET_PEER_Id neighbor, struct MeshTunnel *t) { struct MeshPeer *peer; struct MeshPeerQueue *q; struct MeshPeerQueue *next; struct MeshFlowControl *fc; if (0 == neighbor) return; /* Was local peer, 0'ed in tunnel_destroy_iterator */ peer = peer_get_short (neighbor); for (q = peer->queue_head; NULL != q; q = next) { next = q->next; if (q->tunnel == t) { if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == q->type || GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == q->type) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_cancel_queues %s\n", GNUNET_MESH_DEBUG_M2S (q->type)); } queue_destroy (q, GNUNET_YES); } } if (NULL == peer->queue_head && NULL != peer->core_transmit) { GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit); peer->core_transmit = NULL; } fc = neighbor == t->next_hop ? &t->next_fc : &t->prev_fc; if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task) { GNUNET_SCHEDULER_cancel (fc->poll_task); fc->poll_task = GNUNET_SCHEDULER_NO_TASK; } } /** * Destroy the peer_info and free any allocated resources linked to it * * @param peer The peer_info to destroy. * * @return GNUNET_OK on success */ static int peer_destroy (struct MeshPeer *peer) { struct GNUNET_PeerIdentity id; struct MeshPeerPath *p; struct MeshPeerPath *nextp; unsigned int i; GNUNET_PEER_resolve (peer->id, &id); GNUNET_PEER_change_rc (peer->id, -1); if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer)) { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "removing peer %s, not in hashmap\n", GNUNET_i2s (&id)); } if (NULL != peer->dhtget) { GNUNET_DHT_get_stop (peer->dhtget); } p = peer->path_head; while (NULL != p) { nextp = p->next; GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p); path_destroy (p); p = nextp; } for (i = 0; i < peer->ntunnels; i++) tunnel_destroy_empty (peer->tunnels[i]); GNUNET_array_grow (peer->tunnels, peer->ntunnels, 0); GNUNET_free (peer); return GNUNET_OK; } /** * Remove all paths that rely on a direct connection between p1 and p2 * from the peer itself and notify all tunnels about it. * * @param peer PeerInfo of affected peer. * @param p1 GNUNET_PEER_Id of one peer. * @param p2 GNUNET_PEER_Id of another peer that was connected to the first and * no longer is. * * TODO: optimize (see below) */ static void peer_remove_path (struct MeshPeer *peer, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { struct MeshPeerPath *p; struct MeshPeerPath *next; struct MeshPeer *peer_d; GNUNET_PEER_Id d; unsigned int destroyed; unsigned int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path\n"); destroyed = 0; for (p = peer->path_head; NULL != p; p = next) { next = p->next; for (i = 0; i < (p->length - 1); i++) { if ((p->peers[i] == p1 && p->peers[i + 1] == p2) || (p->peers[i] == p2 && p->peers[i + 1] == p1)) { GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, p); path_destroy (p); destroyed++; break; } } } if (0 == destroyed) return; for (i = 0; i < peer->ntunnels; i++) { d = tunnel_notify_connection_broken (peer->tunnels[i], p1, p2); if (0 == d) continue; peer_d = peer_get_short (d); next = peer_get_best_path (peer_d, peer->tunnels[i]); tunnel_use_path (peer->tunnels[i], next); peer_connect (peer_d, peer->tunnels[i]); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "peer_info_remove_path END\n"); } /** * Add the path to the peer and update the path used to reach it in case this * is the shortest. * * @param peer_info Destination peer to add the path to. * @param path New path to add. Last peer must be the peer in arg 1. * Path will be either used of freed if already known. * @param trusted Do we trust that this path is real? */ void peer_add_path (struct MeshPeer *peer_info, struct MeshPeerPath *path, int trusted) { struct MeshPeerPath *aux; unsigned int l; unsigned int l2; if ((NULL == peer_info) || (NULL == path)) { GNUNET_break (0); path_destroy (path); return; } if (path->peers[path->length - 1] != peer_info->id) { GNUNET_break (0); path_destroy (path); return; } if (2 >= path->length && GNUNET_NO == trusted) { /* Only allow CORE to tell us about direct paths */ path_destroy (path); return; } for (l = 1; l < path->length; l++) { if (path->peers[l] == myid) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shortening path by %u\n", l); for (l2 = 0; l2 < path->length - l; l2++) { path->peers[l2] = path->peers[l + l2]; } path->length -= l; l = 1; path->peers = GNUNET_realloc (path->peers, path->length * sizeof (GNUNET_PEER_Id)); } } #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer_info->id, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n", path->length, GNUNET_i2s (&id)); } #endif l = path_get_length (path); if (0 == l) { path_destroy (path); return; } GNUNET_assert (peer_info->id == path->peers[path->length - 1]); for (aux = peer_info->path_head; aux != NULL; aux = aux->next) { l2 = path_get_length (aux); if (l2 > l) { GNUNET_CONTAINER_DLL_insert_before (peer_info->path_head, peer_info->path_tail, aux, path); return; } else { if (l2 == l && memcmp (path->peers, aux->peers, l) == 0) { path_destroy (path); return; } } } GNUNET_CONTAINER_DLL_insert_tail (peer_info->path_head, peer_info->path_tail, path); return; } /** * Add the path to the origin peer and update the path used to reach it in case * this is the shortest. * The path is given in peer_info -> destination, therefore we turn the path * upside down first. * * @param peer_info Peer to add the path to, being the origin of the path. * @param path New path to add after being inversed. * Path will be either used or freed. * @param trusted Do we trust that this path is real? */ static void peer_add_path_to_origin (struct MeshPeer *peer_info, struct MeshPeerPath *path, int trusted) { path_invert (path); peer_add_path (peer_info, path, trusted); } /** * Add a tunnel to the list of tunnels a peer participates in. * Update the tunnel's destination. * * @param p Peer to add to. * @param t Tunnel to add. */ static void peer_add_tunnel (struct MeshPeer *p, struct MeshTunnel *t) { if (0 != t->dest) { GNUNET_break (t->dest == p->id); return; } t->dest = p->id; GNUNET_PEER_change_rc (t->dest, 1); GNUNET_array_append (p->tunnels, p->ntunnels, t); } /** * Remove a tunnel from the list of tunnels a peer participates in. * Free the tunnel's destination. * * @param p Peer to clean. * @param t Tunnel to remove. */ static void peer_remove_tunnel (struct MeshPeer *p, struct MeshTunnel *t) { unsigned int i; if (t->dest == p->id) { GNUNET_PEER_change_rc (t->dest, -1); t->dest = 0; } for (i = 0; i < p->ntunnels; i++) { if (p->tunnels[i] == t) { p->tunnels[i] = p->tunnels[p->ntunnels - 1]; GNUNET_array_grow (p->tunnels, p->ntunnels, p->ntunnels - 1); return; } } } /** * Function called if the connection to the peer has been stalled for a while, * possibly due to a missed ACK. Poll the peer about its ACK status. * * @param cls Closure (poll ctx). * @param tc TaskContext. */ static void tunnel_poll (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshFlowControl *fc = cls; struct GNUNET_MESH_Poll msg; struct MeshTunnel *t = fc->t; GNUNET_PEER_Id peer; fc->poll_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) { return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** Polling!\n"); GNUNET_PEER_resolve (t->id.oid, &msg.oid); if (fc == &t->prev_fc) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** prev peer!\n"); peer = t->prev_hop; } else if (fc == &t->next_fc) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** next peer!\n"); peer = t->next_hop; } else { GNUNET_break (0); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** peer: %s!\n", GNUNET_i2s(GNUNET_PEER_resolve2 (peer))); if (0 == peer) { if (GNUNET_YES == t->destroy) tunnel_destroy (t); else GNUNET_break (0); return; } msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_POLL); msg.header.size = htons (sizeof (msg)); msg.tid = htonl (t->id.tid); msg.pid = htonl (peer_get_first_payload_pid (peer_get_short (peer), t)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " *** pid (%u)!\n", ntohl (msg.pid)); send_prebuilt_message (&msg.header, peer, t); fc->poll_time = GNUNET_TIME_STD_BACKOFF (fc->poll_time); fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, &tunnel_poll, fc); } /** * Build a PeerPath from the paths returned from the DHT, reversing the paths * to obtain a local peer -> destination path and interning the peer ids. * * @return Newly allocated and created path */ static struct MeshPeerPath * path_build_from_dht (const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length) { struct MeshPeerPath *p; GNUNET_PEER_Id id; int i; p = path_new (1); p->peers[0] = myid; GNUNET_PEER_change_rc (myid, 1); i = get_path_length; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " GET has %d hops.\n", i); for (i--; i >= 0; i--) { id = GNUNET_PEER_intern (&get_path[i]); if (p->length > 0 && id == p->peers[p->length - 1]) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc (id, -1); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from GET: %s.\n", GNUNET_i2s (&get_path[i])); p->length++; p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); p->peers[p->length - 1] = id; } } i = put_path_length; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PUT has %d hops.\n", i); for (i--; i >= 0; i--) { id = GNUNET_PEER_intern (&put_path[i]); if (id == myid) { /* PUT path went through us, so discard the path up until now and start * from here to get a much shorter (and loop-free) path. */ path_destroy (p); p = path_new (0); } if (p->length > 0 && id == p->peers[p->length - 1]) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Optimizing 1 hop out.\n"); GNUNET_PEER_change_rc (id, -1); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Adding from PUT: %s.\n", GNUNET_i2s (&put_path[i])); p->length++; p->peers = GNUNET_realloc (p->peers, sizeof (GNUNET_PEER_Id) * p->length); p->peers[p->length - 1] = id; } } #if MESH_DEBUG if (get_path_length > 0) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of GET: %s)\n", GNUNET_i2s (&get_path[0])); if (put_path_length > 0) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (first of PUT: %s)\n", GNUNET_i2s (&put_path[0])); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " In total: %d hops\n", p->length); for (i = 0; i < p->length; i++) { struct GNUNET_PeerIdentity peer_id; GNUNET_PEER_resolve (p->peers[i], &peer_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " %u: %s\n", p->peers[i], GNUNET_i2s (&peer_id)); } #endif return p; } /** * Adds a path to the peer_infos of all the peers in the path * * @param p Path to process. * @param confirmed Whether we know if the path works or not. */ static void path_add_to_peers (struct MeshPeerPath *p, int confirmed) { unsigned int i; /* TODO: invert and add */ for (i = 0; i < p->length && p->peers[i] != myid; i++) /* skip'em */ ; for (i++; i < p->length; i++) { struct MeshPeer *aux; struct MeshPeerPath *copy; aux = peer_get_short (p->peers[i]); copy = path_duplicate (p); copy->length = i + 1; peer_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed); } } /** * Search for a tunnel among the incoming tunnels * * @param tid the local id of the tunnel * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_incoming (MESH_TunnelNumber tid) { GNUNET_assert (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV); return GNUNET_CONTAINER_multihashmap32_get (incoming_tunnels, tid); } /** * Search for a tunnel among the tunnels for a client * * @param c the client whose tunnels to search in * @param tid the local id of the tunnel * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_by_local_id (struct MeshClient *c, MESH_TunnelNumber tid) { if (0 == (tid & GNUNET_MESH_LOCAL_TUNNEL_ID_CLI)) { GNUNET_break_op (0); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "TID %X not a local tid\n", tid); return NULL; } if (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { return tunnel_get_incoming (tid); } else { return GNUNET_CONTAINER_multihashmap32_get (c->own_tunnels, tid); } } /** * Search for a tunnel by global ID using PEER_ID * * @param pi owner of the tunnel * @param tid global tunnel number * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get_by_pi (GNUNET_PEER_Id pi, MESH_TunnelNumber tid) { struct MESH_TunnelID id; struct GNUNET_HashCode hash; id.oid = pi; id.tid = tid; GNUNET_CRYPTO_hash (&id, sizeof (struct MESH_TunnelID), &hash); return GNUNET_CONTAINER_multihashmap_get (tunnels, &hash); } /** * Search for a tunnel by global ID using full PeerIdentities * * @param oid owner of the tunnel * @param tid global tunnel number * * @return tunnel handler, NULL if doesn't exist */ static struct MeshTunnel * tunnel_get (const struct GNUNET_PeerIdentity *oid, MESH_TunnelNumber tid) { return tunnel_get_by_pi (GNUNET_PEER_search (oid), tid); } /** * Change the tunnel state. * * @param t Tunnel whose ttate to change. * @param state New state. */ static void tunnel_change_state (struct MeshTunnel *t, enum MeshTunnelState state) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s[%X] state was %s\n", GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid, GNUNET_MESH_DEBUG_S2S (t->state)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s[%X] state is now %s\n", GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid, GNUNET_MESH_DEBUG_S2S (state)); t->state = state; } /** * Add a client to a tunnel, initializing all needed data structures. * * @param t Tunnel to which add the client. * @param c Client which to add to the tunnel. */ static void tunnel_add_client (struct MeshTunnel *t, struct MeshClient *c) { if (NULL != t->client) { GNUNET_break(0); return; } if (GNUNET_OK != GNUNET_CONTAINER_multihashmap32_put (c->incoming_tunnels, t->local_tid_dest, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) { GNUNET_break (0); return; } if (GNUNET_OK != GNUNET_CONTAINER_multihashmap32_put (incoming_tunnels, t->local_tid_dest, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST)) { GNUNET_break (0); return; } t->client = c; } static void tunnel_use_path (struct MeshTunnel *t, struct MeshPeerPath *p) { unsigned int own_pos; for (own_pos = 0; own_pos < p->length; own_pos++) { if (p->peers[own_pos] == myid) break; } if (own_pos > p->length - 1) { GNUNET_break (0); return; } if (own_pos < p->length - 1) t->next_hop = p->peers[own_pos + 1]; else t->next_hop = p->peers[own_pos]; GNUNET_PEER_change_rc (t->next_hop, 1); if (0 < own_pos) t->prev_hop = p->peers[own_pos - 1]; else t->prev_hop = p->peers[0]; GNUNET_PEER_change_rc (t->prev_hop, 1); if (NULL != t->path) path_destroy (t->path); t->path = path_duplicate (p); if (0 == own_pos) { if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task) GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task); t->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time, &tunnel_fwd_keepalive, t); } } /** * Notifies a tunnel that a connection has broken that affects at least * some of its peers. Sends a notification towards the root of the tree. * In case the peer is the owner of the tree, notifies the client that owns * the tunnel and tries to reconnect. * * @param t Tunnel affected. * @param p1 Peer that got disconnected from p2. * @param p2 Peer that got disconnected from p1. * * @return Short ID of the peer disconnected (either p1 or p2). * 0 if the tunnel remained unaffected. */ static GNUNET_PEER_Id tunnel_notify_connection_broken (struct MeshTunnel *t, GNUNET_PEER_Id p1, GNUNET_PEER_Id p2) { // if (myid != p1 && myid != p2) FIXME // { // return; // } // // if (tree_get_predecessor (t->tree) != 0) // { // /* We are the peer still connected, notify owner of the disconnection. */ // struct GNUNET_MESH_PathBroken msg; // struct GNUNET_PeerIdentity neighbor; // // msg.header.size = htons (sizeof (msg)); // msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN); // GNUNET_PEER_resolve (t->id.oid, &msg.oid); // msg.tid = htonl (t->id.tid); // msg.peer1 = my_full_id; // GNUNET_PEER_resolve (pid, &msg.peer2); // GNUNET_PEER_resolve (tree_get_predecessor (t->tree), &neighbor); // send_prebuilt_message (&msg.header, &neighbor, t); // } return 0; } /** * Send an end-to-end FWD ACK message for the most recent in-sequence payload. * * @param t Tunnel this is about. * @param fwd Is for FWD traffic? (ACK dest->owner) */ static void tunnel_send_data_ack (struct MeshTunnel *t, int fwd) { struct GNUNET_MESH_DataACK msg; struct MeshTunnelReliability *rel; struct MeshReliableMessage *copy; GNUNET_PEER_Id hop; uint64_t mask; unsigned int delta; rel = fwd ? t->bck_rel : t->fwd_rel; hop = fwd ? t->prev_hop : t->next_hop; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack for %u\n", rel->mid_recv - 1); if (GNUNET_NO == t->reliable) { GNUNET_break_op (0); return; } msg.header.type = htons (fwd ? GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK : GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK); msg.header.size = htons (sizeof (msg)); msg.tid = htonl (t->id.tid); GNUNET_PEER_resolve (t->id.oid, &msg.oid); msg.mid = htonl (rel->mid_recv - 1); msg.futures = 0; for (copy = rel->head_recv; NULL != copy; copy = copy->next) { delta = copy->mid - rel->mid_recv; if (63 < delta) break; mask = 0x1LL << delta; msg.futures |= mask; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " setting bit for %u (delta %u) (%llX) -> %llX\n", copy->mid, delta, mask, msg.futures); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " final futures %llX\n", msg.futures); send_prebuilt_message (&msg.header, hop, t); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_data_ack END\n"); } /** * Send an ACK informing the predecessor about the available buffer space. * In case there is no predecessor, inform the owning client. * If buffering is off, send only on behalf of children or self if endpoint. * If buffering is on, send when sent to children and buffer space is free. * Note that although the name is fwd_ack, the FWD mean forward *traffic*, * the ACK itself goes "back" (towards root). * * @param t Tunnel on which to send the ACK. * @param type Type of message that triggered the ACK transmission. * @param fwd Is this FWD ACK? (Going dest->owner) */ static void tunnel_send_ack (struct MeshTunnel *t, uint16_t type, int fwd) { struct MeshTunnelReliability *rel; struct MeshFlowControl *next_fc; struct MeshFlowControl *prev_fc; struct MeshClient *c; struct MeshClient *o; GNUNET_PEER_Id hop; uint32_t delta_mid; uint32_t ack; int delta; rel = fwd ? t->fwd_rel : t->bck_rel; c = fwd ? t->client : t->owner; o = fwd ? t->owner : t->client; next_fc = fwd ? &t->next_fc : &t->prev_fc; prev_fc = fwd ? &t->prev_fc : &t->next_fc; hop = fwd ? t->prev_hop : t->next_hop; switch (type) { case GNUNET_MESSAGE_TYPE_MESH_UNICAST: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "ACK due to %s\n", GNUNET_MESH_DEBUG_M2S (type)); if (GNUNET_YES == t->nobuffer && (GNUNET_NO == t->reliable || NULL == c)) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, nobuffer\n"); return; } if (GNUNET_YES == t->reliable && NULL != c) tunnel_send_data_ack (t, fwd); break; case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK: break; case GNUNET_MESSAGE_TYPE_MESH_POLL: case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK: t->force_ack = GNUNET_YES; break; default: GNUNET_break (0); } /* Check if we need to transmit the ACK */ if (NULL == o && prev_fc->last_ack_sent - prev_fc->last_pid_recv > 3 && GNUNET_NO == t->force_ack) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK, buffer free\n"); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " last pid recv: %u, last ack sent: %u\n", prev_fc->last_pid_recv, prev_fc->last_ack_sent); return; } /* Ok, ACK might be necessary, what PID to ACK? */ delta = t->queue_max - next_fc->queue_n; if (NULL != o && GNUNET_YES == t->reliable && NULL != rel->head_sent) delta_mid = rel->mid_sent - rel->head_sent->mid; else delta_mid = 0; if (0 > delta || (GNUNET_YES == t->reliable && NULL != o && (10 < rel->n_sent || 64 <= delta_mid))) delta = 0; if (NULL != o && delta > 1) delta = 1; ack = prev_fc->last_pid_recv + delta; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " last pid %u, last ack %u, qmax %u, q %u\n", prev_fc->last_pid_recv, prev_fc->last_ack_sent, t->queue_max, next_fc->queue_n); if (ack == prev_fc->last_ack_sent && GNUNET_NO == t->force_ack) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Not sending FWD ACK, not needed\n"); return; } prev_fc->last_ack_sent = ack; if (NULL != o) send_local_ack (t, o, fwd); else if (0 != hop) send_ack (t, hop, ack); else GNUNET_break (GNUNET_YES == t->destroy); t->force_ack = GNUNET_NO; } /** * Modify the mesh message TID from global to local and send to client. * * @param t Tunnel on which to send the message. * @param msg Message to modify and send. * @param c Client to send to. * @param tid Tunnel ID to use (c can be both owner and client). */ static void tunnel_send_client_to_tid (struct MeshTunnel *t, const struct GNUNET_MESH_Data *msg, struct MeshClient *c, MESH_TunnelNumber tid) { struct GNUNET_MESH_LocalData *copy; uint16_t size = ntohs (msg->header.size) - sizeof (struct GNUNET_MESH_Data); char cbuf[size + sizeof (struct GNUNET_MESH_LocalData)]; if (size < sizeof (struct GNUNET_MessageHeader)) { GNUNET_break_op (0); return; } if (NULL == c) { GNUNET_break (0); return; } copy = (struct GNUNET_MESH_LocalData *) cbuf; memcpy (©[1], &msg[1], size); copy->header.size = htons (sizeof (struct GNUNET_MESH_LocalData) + size); copy->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA); copy->tid = htonl (tid); GNUNET_SERVER_notification_context_unicast (nc, c->handle, ©->header, GNUNET_NO); } /** * Modify the unicast message TID from global to local and send to client. * * @param t Tunnel on which to send the message. * @param msg Message to modify and send. * @param fwd Forward? */ static void tunnel_send_client_data (struct MeshTunnel *t, const struct GNUNET_MESH_Data *msg, int fwd) { if (fwd) tunnel_send_client_to_tid (t, msg, t->client, t->local_tid_dest); else tunnel_send_client_to_tid (t, msg, t->owner, t->local_tid); } /** * Send up to 64 buffered messages to the client for in order delivery. * * @param t Tunnel on which to empty the message buffer. * @param c Client to send to. * @param rel Reliability structure to corresponding peer. * If rel == t->bck_rel, this is FWD data. */ static void tunnel_send_client_buffered_data (struct MeshTunnel *t, struct MeshClient *c, struct MeshTunnelReliability *rel) { ; struct MeshReliableMessage *copy; struct MeshReliableMessage *next; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data\n"); for (copy = rel->head_recv; NULL != copy; copy = next) { next = copy->next; if (copy->mid == rel->mid_recv) { struct GNUNET_MESH_Data *msg = (struct GNUNET_MESH_Data *) ©[1]; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " have %u! now expecting %u\n", copy->mid, rel->mid_recv + 1); tunnel_send_client_data (t, msg, (rel == t->bck_rel)); rel->mid_recv++; GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy); GNUNET_free (copy); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't have %u, next is %u\n", rel->mid_recv, copy->mid); return; } } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "send_buffered_data END\n"); } /** * We have received a message out of order, buffer it until we receive * the missing one and we can feed the rest to the client. * * @param t Tunnel to add to. * @param msg Message to buffer. * @param rel Reliability data to the corresponding direction. */ static void tunnel_add_buffered_data (struct MeshTunnel *t, const struct GNUNET_MESH_Data *msg, struct MeshTunnelReliability *rel) { struct MeshReliableMessage *copy; struct MeshReliableMessage *prev; uint32_t mid; uint16_t size; size = ntohs (msg->header.size); mid = ntohl (msg->mid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data %u\n", mid); copy = GNUNET_malloc (sizeof (*copy) + size); copy->mid = mid; copy->rel = rel; memcpy (©[1], msg, size); // FIXME do something better than O(n), although n < 64... // FIXME start from the end (most messages are the latest ones) for (prev = rel->head_recv; NULL != prev; prev = prev->next) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prev %u\n", prev->mid); if (GMC_is_pid_bigger (prev->mid, mid)) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " bingo!\n"); GNUNET_CONTAINER_DLL_insert_before (rel->head_recv, rel->tail_recv, prev, copy); return; } } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " insert at tail!\n"); GNUNET_CONTAINER_DLL_insert_tail (rel->head_recv, rel->tail_recv, copy); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "add_buffered_data END\n"); } /** * Destroy a reliable message after it has been acknowledged, either by * direct mid ACK or bitfield. Updates the appropriate data structures and * timers and frees all memory. * * @param copy Message that is no longer needed: remote peer got it. */ static void tunnel_free_reliable_message (struct MeshReliableMessage *copy) { struct MeshTunnelReliability *rel; struct GNUNET_TIME_Relative time; rel = copy->rel; time = GNUNET_TIME_absolute_get_duration (copy->timestamp); rel->expected_delay.rel_value_us *= 7; rel->expected_delay.rel_value_us += time.rel_value_us; rel->expected_delay.rel_value_us /= 8; rel->n_sent--; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Freeing %u\n", copy->mid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! took %s\n", GNUNET_STRINGS_relative_time_to_string (time, GNUNET_NO)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! new expected delay %s\n", GNUNET_STRINGS_relative_time_to_string (rel->expected_delay, GNUNET_NO)); rel->retry_timer = rel->expected_delay; GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy); GNUNET_free (copy); } /** * Destroy all reliable messages queued for a tunnel, * during a tunnel destruction. * Frees the reliability structure itself. * * @param rel Reliability data for a tunnel. */ static void tunnel_free_reliable_all (struct MeshTunnelReliability *rel) { struct MeshReliableMessage *copy; struct MeshReliableMessage *next; if (NULL == rel) return; for (copy = rel->head_recv; NULL != copy; copy = next) { next = copy->next; GNUNET_CONTAINER_DLL_remove (rel->head_recv, rel->tail_recv, copy); GNUNET_free (copy); } for (copy = rel->head_sent; NULL != copy; copy = next) { next = copy->next; GNUNET_CONTAINER_DLL_remove (rel->head_sent, rel->tail_sent, copy); GNUNET_free (copy); } if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task) GNUNET_SCHEDULER_cancel (rel->retry_task); GNUNET_free (rel); } /** * Mark future messages as ACK'd. * * @param t Tunnel whose sent buffer to clean. * @param msg DataACK message with a bitfield of future ACK'd messages. * @param rel Reliability data. */ static void tunnel_free_sent_reliable (struct MeshTunnel *t, const struct GNUNET_MESH_DataACK *msg, struct MeshTunnelReliability *rel) { struct MeshReliableMessage *copy; struct MeshReliableMessage *next; uint64_t bitfield; uint64_t mask; uint32_t mid; uint32_t target; unsigned int i; bitfield = msg->futures; mid = ntohl (msg->mid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable %u %llX\n", mid, bitfield); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " rel %p, head %p\n", rel, rel->head_sent); for (i = 0, copy = rel->head_sent; i < 64 && NULL != copy && 0 != bitfield; i++) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " trying bit %u (mid %u)\n", i, mid + i + 1); mask = 0x1LL << i; if (0 == (bitfield & mask)) continue; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " set!\n"); /* Bit was set, clear the bit from the bitfield */ bitfield &= ~mask; /* The i-th bit was set. Do we have that copy? */ /* Skip copies with mid < target */ target = mid + i + 1; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " target %u\n", target); while (NULL != copy && GMC_is_pid_bigger (target, copy->mid)) copy = copy->next; /* Did we run out of copies? (previously freed, it's ok) */ if (NULL == copy) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "run out of copies...\n"); return; } /* Did we overshoot the target? (previously freed, it's ok) */ if (GMC_is_pid_bigger (copy->mid, target)) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " next copy %u\n", copy->mid); continue; } /* Now copy->mid == target, free it */ next = copy->next; tunnel_free_reliable_message (copy); copy = next; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "free_sent_reliable END\n"); } /** * We haven't received an ACK after a certain time: restransmit the message. * * @param cls Closure (MeshReliableMessage with the message to restransmit) * @param tc TaskContext. */ static void tunnel_retransmit_message (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnelReliability *rel = cls; struct MeshReliableMessage *copy; struct MeshFlowControl *fc; struct MeshPeerQueue *q; struct MeshPeer *pi; struct MeshTunnel *t; struct GNUNET_MESH_Data *payload; GNUNET_PEER_Id hop; rel->retry_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; t = rel->t; copy = rel->head_sent; if (NULL == copy) { GNUNET_break (0); return; } /* Search the message to be retransmitted in the outgoing queue */ payload = (struct GNUNET_MESH_Data *) ©[1]; hop = rel == t->fwd_rel ? t->next_hop : t->prev_hop; fc = rel == t->fwd_rel ? &t->prev_fc : &t->next_fc; pi = peer_get_short (hop); for (q = pi->queue_head; NULL != q; q = q->next) { if (ntohs (payload->header.type) == q->type) { struct GNUNET_MESH_Data *queued_data = q->cls; if (queued_data->mid == payload->mid) break; } } /* Message not found in the queue */ if (NULL == q) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RETRANSMIT %u\n", copy->mid); fc->last_ack_sent++; fc->last_pid_recv++; payload->pid = htonl (fc->last_pid_recv); send_prebuilt_message (&payload->header, hop, t); GNUNET_STATISTICS_update (stats, "# data retransmitted", 1, GNUNET_NO); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! STILL IN QUEUE %u\n", copy->mid); } rel->retry_timer = GNUNET_TIME_STD_BACKOFF (rel->retry_timer); rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer, &tunnel_retransmit_message, cls); } /** * Send keepalive packets for a tunnel. * * @param t Tunnel to keep alive.. * @param fwd Is this a FWD keepalive? (owner -> dest). */ static void tunnel_keepalive (struct MeshTunnel *t, int fwd) { struct GNUNET_MESH_TunnelKeepAlive *msg; size_t size = sizeof (struct GNUNET_MESH_TunnelKeepAlive); char cbuf[size]; GNUNET_PEER_Id hop; uint16_t type; type = fwd ? GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE : GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE; hop = fwd ? t->next_hop : t->prev_hop; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending %s keepalive for tunnel %d\n", fwd ? "FWD" : "BCK", t->id.tid); msg = (struct GNUNET_MESH_TunnelKeepAlive *) cbuf; msg->header.size = htons (size); msg->header.type = htons (type); msg->oid = *(GNUNET_PEER_resolve2 (t->id.oid)); msg->tid = htonl (t->id.tid); send_prebuilt_message (&msg->header, hop, t); } /** * Send create (PATH_CREATE/PATH_ACK) packets for a tunnel. * * @param t Tunnel for which to send the message. * @param fwd If GNUNET_YES, send CREATE, otherwise send ACK. */ static void tunnel_recreate (struct MeshTunnel *t, int fwd) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "sending path recreate for tunnel %s[%X]\n", GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid); if (fwd) send_path_create (t); else send_path_ack (t); } /** * Generic tunnel timer management. * Depending on the role of the peer in the tunnel will send the * appropriate message (build or keepalive) * * @param t Tunnel to maintain. * @param fwd Is FWD? */ static void tunnel_maintain (struct MeshTunnel *t, int fwd) { switch (t->state) { case MESH_TUNNEL_NEW: GNUNET_break (0); case MESH_TUNNEL_SEARCHING: /* TODO DHT GET with RO_BART */ break; case MESH_TUNNEL_WAITING: tunnel_recreate (t, fwd); break; case MESH_TUNNEL_READY: tunnel_keepalive (t, fwd); break; default: break; } } static void tunnel_fwd_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) || NULL == t->owner) return; tunnel_maintain (t, GNUNET_YES); t->fwd_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time, &tunnel_fwd_keepalive, t); } static void tunnel_bck_keepalive (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) || NULL == t->client) return; tunnel_keepalive (t, GNUNET_NO); t->bck_maintenance_task = GNUNET_SCHEDULER_add_delayed (refresh_path_time, &tunnel_bck_keepalive, t); } /** * Send a message to all peers and clients in this tunnel that the tunnel * is no longer valid. If some peer or client should not receive the message, * should be zero'ed out before calling this function. * * @param t The tunnel whose peers and clients to notify. */ static void tunnel_send_destroy (struct MeshTunnel *t) { struct GNUNET_MESH_TunnelDestroy msg; struct GNUNET_PeerIdentity id; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY); GNUNET_PEER_resolve (t->id.oid, &msg.oid); msg.tid = htonl (t->id.tid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending tunnel destroy for tunnel: %s [%X]\n", GNUNET_i2s (&msg.oid), t->id.tid); if (NULL == t->client && 0 != t->next_hop) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " child: %u\n", t->next_hop); GNUNET_PEER_resolve (t->next_hop, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending forward to %s\n", GNUNET_i2s (&id)); send_prebuilt_message (&msg.header, t->next_hop, t); } if (NULL == t->owner && 0 != t->prev_hop) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " parent: %u\n", t->prev_hop); GNUNET_PEER_resolve (t->prev_hop, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " sending back to %s\n", GNUNET_i2s (&id)); send_prebuilt_message (&msg.header, t->prev_hop, t); } if (NULL != t->owner) { send_local_tunnel_destroy (t, GNUNET_NO); } if (NULL != t->client) { send_local_tunnel_destroy (t, GNUNET_YES); } } static int tunnel_destroy (struct MeshTunnel *t) { struct MeshClient *c; struct GNUNET_HashCode hash; int r; if (NULL == t) return GNUNET_OK; r = GNUNET_OK; c = t->owner; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s [%x]\n", GNUNET_i2s (GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid); if (NULL != c) GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); GNUNET_CRYPTO_hash (&t->id, sizeof (struct MESH_TunnelID), &hash); if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_remove (tunnels, &hash, t)) { GNUNET_break (0); r = GNUNET_SYSERR; } if (NULL != c) { if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->own_tunnels, t->local_tid, t)) { GNUNET_break (0); r = GNUNET_SYSERR; } } c = t->client; if (NULL != c) { if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (c->incoming_tunnels, t->local_tid_dest, t)) { GNUNET_break (0); r = GNUNET_SYSERR; } if (GNUNET_YES != GNUNET_CONTAINER_multihashmap32_remove (incoming_tunnels, t->local_tid_dest, t)) { GNUNET_break (0); r = GNUNET_SYSERR; } } if(GNUNET_YES == t->reliable) { tunnel_free_reliable_all (t->fwd_rel); tunnel_free_reliable_all (t->bck_rel); } if (0 != t->prev_hop) { peer_cancel_queues (t->prev_hop, t); GNUNET_PEER_change_rc (t->prev_hop, -1); } if (0 != t->next_hop) { peer_cancel_queues (t->next_hop, t); GNUNET_PEER_change_rc (t->next_hop, -1); } if (GNUNET_SCHEDULER_NO_TASK != t->next_fc.poll_task) { GNUNET_SCHEDULER_cancel (t->next_fc.poll_task); t->next_fc.poll_task = GNUNET_SCHEDULER_NO_TASK; } if (GNUNET_SCHEDULER_NO_TASK != t->prev_fc.poll_task) { GNUNET_SCHEDULER_cancel (t->prev_fc.poll_task); t->prev_fc.poll_task = GNUNET_SCHEDULER_NO_TASK; } if (0 != t->dest) { peer_remove_tunnel (peer_get_short (t->dest), t); } if (GNUNET_SCHEDULER_NO_TASK != t->fwd_maintenance_task) GNUNET_SCHEDULER_cancel (t->fwd_maintenance_task); if (GNUNET_SCHEDULER_NO_TASK != t->bck_maintenance_task) GNUNET_SCHEDULER_cancel (t->bck_maintenance_task); n_tunnels--; GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO); path_destroy (t->path); GNUNET_free (t); return r; } /** * Tunnel is empty: destroy it. * * Notifies all participants (peers, cleints) about the destruction. * * @param t Tunnel to destroy. */ static void tunnel_destroy_empty (struct MeshTunnel *t) { #if MESH_DEBUG { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (t->id.oid, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "executing destruction of empty tunnel %s [%X]\n", GNUNET_i2s (&id), t->id.tid); } #endif if (GNUNET_NO == t->destroy) tunnel_send_destroy (t); if (0 == t->pending_messages) tunnel_destroy (t); else t->destroy = GNUNET_YES; } /** * Initialize a Flow Control structure to the initial state. * * @param fc Flow Control structure to initialize. */ static void fc_init (struct MeshFlowControl *fc) { fc->last_pid_sent = (uint32_t) -1; /* Next (expected) = 0 */ fc->last_pid_recv = (uint32_t) -1; fc->last_ack_sent = (uint32_t) -1; /* No traffic allowed yet */ fc->last_ack_recv = (uint32_t) -1; fc->poll_task = GNUNET_SCHEDULER_NO_TASK; fc->poll_time = GNUNET_TIME_UNIT_SECONDS; fc->queue_n = 0; } /** * Create a new tunnel * * @param owner Who is the owner of the tunnel (short ID). * @param tid Tunnel Number of the tunnel. * @param client Clients that owns the tunnel, NULL for foreign tunnels. * @param local Tunnel Number for the tunnel, for the client point of view. * * @return A new initialized tunnel. NULL on error. */ static struct MeshTunnel * tunnel_new (GNUNET_PEER_Id owner, MESH_TunnelNumber tid, struct MeshClient *client, MESH_TunnelNumber local) { struct MeshTunnel *t; struct GNUNET_HashCode hash; if (n_tunnels >= max_tunnels && NULL == client) return NULL; t = GNUNET_malloc (sizeof (struct MeshTunnel)); t->id.oid = owner; t->id.tid = tid; t->queue_max = (max_msgs_queue / max_tunnels) + 1; t->owner = client; fc_init (&t->next_fc); fc_init (&t->prev_fc); t->next_fc.t = t; t->prev_fc.t = t; t->local_tid = local; n_tunnels++; GNUNET_STATISTICS_update (stats, "# tunnels", 1, GNUNET_NO); 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); tunnel_destroy (t); if (NULL != client) { GNUNET_break (0); GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR); } return NULL; } if (NULL != client) { if (GNUNET_OK != GNUNET_CONTAINER_multihashmap32_put (client->own_tunnels, t->local_tid, t, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY)) { tunnel_destroy (t); GNUNET_break (0); GNUNET_SERVER_receive_done (client->handle, GNUNET_SYSERR); return NULL; } } return t; } /** * Set options in a tunnel, extracted from a bit flag field * * @param t Tunnel to set options to. * @param options Bit array in host byte order. */ static void tunnel_set_options (struct MeshTunnel *t, uint32_t options) { t->nobuffer = (options & GNUNET_MESH_OPTION_NOBUFFER) != 0 ? GNUNET_YES : GNUNET_NO; t->reliable = (options & GNUNET_MESH_OPTION_RELIABLE) != 0 ? GNUNET_YES : GNUNET_NO; } /** * Iterator for deleting each tunnel whose client endpoint disconnected. * * @param cls Closure (client that has disconnected). * @param key The local tunnel id (used to access the hashmap). * @param value The value stored at the key (tunnel to destroy). * * @return GNUNET_OK, keep iterating. */ static int tunnel_destroy_iterator (void *cls, uint32_t key, void *value) { struct MeshTunnel *t = value; struct MeshClient *c = cls; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Tunnel %X / %X destroy, due to client %u shutdown.\n", t->local_tid, t->local_tid_dest, c->id); client_delete_tunnel (c, t); if (c == t->client) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is destination.\n", c->id); t->client = NULL; if (0 != t->next_hop) { /* destroy could come before a path is used */ GNUNET_PEER_change_rc (t->next_hop, -1); t->next_hop = 0; } } if (c == t->owner) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Client %u is owner.\n", c->id); t->owner = NULL; if (0 != t->prev_hop) { /* destroy could come before a path is used */ GNUNET_PEER_change_rc (t->prev_hop, -1); t->prev_hop = 0; } } tunnel_destroy_empty (t); return GNUNET_OK; } /** * remove client's ports from the global hashmap on diconnect. * * @param cls Closure (unused). * @param key Port. * @param value ThClient structure. * * @return GNUNET_OK, keep iterating. */ static int client_release_ports (void *cls, uint32_t key, void *value) { int res; res = GNUNET_CONTAINER_multihashmap32_remove (ports, key, value); if (GNUNET_YES != res) { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Port %u by client %p was not registered.\n", key, value); } return GNUNET_OK; } /** * Timeout function due to lack of keepalive/traffic from the owner. * Destroys tunnel if called. * * @param cls Closure (tunnel to destroy). * @param tc TaskContext */ static void tunnel_fwd_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; t->fwd_maintenance_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s [%X] FWD timed out. Destroying.\n", GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid); if (NULL != t->client) send_local_tunnel_destroy (t, GNUNET_YES); tunnel_destroy (t); /* Do not notify other */ } /** * Timeout function due to lack of keepalive/traffic from the destination. * Destroys tunnel if called. * * @param cls Closure (tunnel to destroy). * @param tc TaskContext */ static void tunnel_bck_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshTunnel *t = cls; t->bck_maintenance_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s [%X] BCK timed out. Destroying.\n", GNUNET_i2s(GNUNET_PEER_resolve2 (t->id.oid)), t->id.tid); if (NULL != t->owner) send_local_tunnel_destroy (t, GNUNET_NO); tunnel_destroy (t); /* Do not notify other */ } /** * Resets the tunnel timeout task, some other message has done the task's job. * - For the first peer on the direction this means to send * a keepalive or a path confirmation message (either create or ACK). * - For all other peers, this means to destroy the tunnel, * due to lack of activity. * Starts the tiemout if no timeout was running (tunnel just created). * * @param t Tunnel whose timeout to reset. * @param fwd Is this forward? * * TODO use heap to improve efficiency of scheduler. */ static void tunnel_reset_timeout (struct MeshTunnel *t, int fwd) { GNUNET_SCHEDULER_TaskIdentifier *ti; GNUNET_SCHEDULER_Task f; struct MeshClient *c; ti = fwd ? &t->fwd_maintenance_task : &t->bck_maintenance_task; c = fwd ? t->owner : t->client; if (GNUNET_SCHEDULER_NO_TASK != *ti) GNUNET_SCHEDULER_cancel (*ti); if (NULL != c) { f = fwd ? &tunnel_fwd_keepalive : &tunnel_bck_keepalive; *ti = GNUNET_SCHEDULER_add_delayed (refresh_path_time, f, t); } else { f = fwd ? &tunnel_fwd_timeout : &tunnel_bck_timeout; *ti = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_relative_multiply (refresh_path_time, 4), f, t); } } /******************************************************************************/ /**************** MESH NETWORK HANDLER HELPERS ***********************/ /******************************************************************************/ /** * Free a transmission that was already queued with all resources * associated to the request. * * @param queue Queue handler to cancel. * @param clear_cls Is it necessary to free associated cls? */ static void queue_destroy (struct MeshPeerQueue *queue, int clear_cls) { struct MeshFlowControl *fc; if (GNUNET_YES == clear_cls) { switch (queue->type) { case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY: GNUNET_log (GNUNET_ERROR_TYPE_INFO, " cancelling TUNNEL_DESTROY\n"); GNUNET_break (GNUNET_YES == queue->tunnel->destroy); /* fall through */ case GNUNET_MESSAGE_TYPE_MESH_UNICAST: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE: case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " prebuilt message\n"); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type %s\n", GNUNET_MESH_DEBUG_M2S (queue->type)); break; case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " type create path\n"); break; default: GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n", GNUNET_MESH_DEBUG_M2S (queue->type)); } GNUNET_free_non_null (queue->cls); } GNUNET_CONTAINER_DLL_remove (queue->peer->queue_head, queue->peer->queue_tail, queue); /* Delete from appropriate fc in the tunnel */ if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == queue->type || GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == queue->type ) { if (queue->peer->id == queue->tunnel->prev_hop) fc = &queue->tunnel->prev_fc; else if (queue->peer->id == queue->tunnel->next_hop) fc = &queue->tunnel->next_fc; else { GNUNET_break (0); GNUNET_free (queue); return; } fc->queue_n--; } GNUNET_free (queue); } /** * @brief Get the next transmittable message from the queue. * * This will be the head, except in the case of being a data packet * not allowed by the destination peer. * * @param peer Destination peer. * * @return The next viable MeshPeerQueue element to send to that peer. * NULL when there are no transmittable messages. */ struct MeshPeerQueue * queue_get_next (const struct MeshPeer *peer) { struct MeshPeerQueue *q; struct GNUNET_MESH_Data *dmsg; struct MeshTunnel* t; uint32_t pid; uint32_t ack; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* selecting message\n"); for (q = peer->queue_head; NULL != q; q = q->next) { t = q->tunnel; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* %s\n", GNUNET_MESH_DEBUG_M2S (q->type)); dmsg = (struct GNUNET_MESH_Data *) q->cls; pid = ntohl (dmsg->pid); switch (q->type) { case GNUNET_MESSAGE_TYPE_MESH_UNICAST: ack = t->next_fc.last_ack_recv; break; case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: ack = t->prev_fc.last_ack_recv; break; default: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* OK!\n"); return q; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* ACK: %u, PID: %u, MID: %u\n", ack, pid, ntohl (dmsg->mid)); if (GNUNET_NO == GMC_is_pid_bigger (pid, ack)) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* OK!\n"); return q; } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* NEXT!\n"); } } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* nothing found\n"); return NULL; } static size_t queue_send (void *cls, size_t size, void *buf) { struct MeshPeer *peer = cls; struct GNUNET_MessageHeader *msg; struct MeshPeerQueue *queue; struct MeshTunnel *t; struct GNUNET_PeerIdentity dst_id; struct MeshFlowControl *fc; size_t data_size; uint32_t pid; uint16_t type; peer->core_transmit = NULL; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Queue send\n"); if (NULL == buf || 0 == size) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n"); return 0; } queue = queue_get_next (peer); /* Queue has no internal mesh traffic nor sendable payload */ if (NULL == queue) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not ready, return\n"); if (NULL == peer->queue_head) GNUNET_break (0); /* Core tmt_rdy should've been canceled */ return 0; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not empty\n"); GNUNET_PEER_resolve (peer->id, &dst_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* towards %s\n", GNUNET_i2s (&dst_id)); /* Check if buffer size is enough for the message */ if (queue->size > size) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* not enough room, reissue\n"); peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, 0, GNUNET_TIME_UNIT_FOREVER_REL, &dst_id, queue->size, &queue_send, peer); return 0; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* size ok\n"); t = queue->tunnel; GNUNET_assert (0 < t->pending_messages); t->pending_messages--; type = 0; /* Fill buf */ switch (queue->type) { case 0: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: case GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN: case GNUNET_MESSAGE_TYPE_MESH_PATH_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE: case GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* raw: %s\n", GNUNET_MESH_DEBUG_M2S (queue->type)); /* Fall through */ case GNUNET_MESSAGE_TYPE_MESH_UNICAST: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: data_size = send_core_data_raw (queue->cls, size, buf); msg = (struct GNUNET_MessageHeader *) buf; type = ntohs (msg->type); break; case GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path create\n"); data_size = send_core_path_create (queue->cls, size, buf); break; case GNUNET_MESSAGE_TYPE_MESH_PATH_ACK: GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n"); data_size = send_core_path_ack (queue->cls, size, buf); break; default: GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "* type unknown: %u\n", queue->type); data_size = 0; } if (0 < drop_percent && GNUNET_CRYPTO_random_u32(GNUNET_CRYPTO_QUALITY_WEAK, 101) < drop_percent) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Dropping message of type %s\n", GNUNET_MESH_DEBUG_M2S(queue->type)); data_size = 0; } /* Free queue, but cls was freed by send_core_* */ queue_destroy (queue, GNUNET_NO); /* Send ACK if needed, after accounting for sent ID in fc->queue_n */ pid = ((struct GNUNET_MESH_Data *) buf)->pid; pid = ntohl (pid); switch (type) { case GNUNET_MESSAGE_TYPE_MESH_UNICAST: t->next_fc.last_pid_sent = pid; tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_UNICAST, GNUNET_YES); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! FWD %u\n", ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) ); break; case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: t->prev_fc.last_pid_sent = pid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! BCK %u\n", ntohl ( ((struct GNUNET_MESH_Data *) buf)->mid ) ); tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, GNUNET_NO); break; default: break; } /* If more data in queue, send next */ queue = queue_get_next (peer); if (NULL != queue) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n"); if (NULL == peer->core_transmit) { peer->core_transmit = GNUNET_CORE_notify_transmit_ready(core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, &dst_id, queue->size, &queue_send, peer); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n"); } } if (peer->id == t->next_hop) fc = &t->next_fc; else if (peer->id == t->prev_hop) fc = &t->prev_fc; else { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "id: %u, next: %u, prev: %u\n", peer->id, t->next_hop, t->prev_hop); return data_size; } if (NULL != peer->queue_head) { if (GNUNET_SCHEDULER_NO_TASK == fc->poll_task && fc->queue_n > 0) { GNUNET_log (GNUNET_ERROR_TYPE_INFO, "* %s starting poll timeout\n", GNUNET_i2s (&my_full_id)); fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, &tunnel_poll, fc); } } else { if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task) { GNUNET_SCHEDULER_cancel (fc->poll_task); fc->poll_task = GNUNET_SCHEDULER_NO_TASK; } } if (GNUNET_YES == t->destroy && 0 == t->pending_messages) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* destroying tunnel!\n"); tunnel_destroy (t); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size); return data_size; } /** * @brief Queue and pass message to core when possible. * * If type is payload (UNICAST, TO_ORIGIN) checks for queue status and * accounts for it. In case the queue is full, the message is dropped and * a break issued. * * Otherwise, message is treated as internal and allowed to go regardless of * queue status. * * @param cls Closure (@c type dependant). It will be used by queue_send to * build the message to be sent if not already prebuilt. * @param type Type of the message, 0 for a raw message. * @param size Size of the message. * @param dst Neighbor to send message to. * @param t Tunnel this message belongs to. */ static void queue_add (void *cls, uint16_t type, size_t size, struct MeshPeer *dst, struct MeshTunnel *t) { struct MeshPeerQueue *queue; struct MeshFlowControl *fc; int priority; fc = NULL; priority = GNUNET_NO; if (GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) { fc = &t->next_fc; } else if (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type) { fc = &t->prev_fc; } if (NULL != fc) { if (fc->queue_n >= t->queue_max) { /* If this isn't a retransmission, drop the message */ if (GNUNET_NO == t->reliable || (NULL == t->owner && GNUNET_MESSAGE_TYPE_MESH_UNICAST == type) || (NULL == t->client && GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN == type)) { GNUNET_STATISTICS_update (stats, "# messages dropped (buffer full)", 1, GNUNET_NO); GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "queue full: %u/%u\n", fc->queue_n, t->queue_max); return; /* Drop this message */ } priority = GNUNET_YES; } fc->queue_n++; if (GMC_is_pid_bigger(fc->last_pid_sent + 1, fc->last_ack_recv) && GNUNET_SCHEDULER_NO_TASK == fc->poll_task) fc->poll_task = GNUNET_SCHEDULER_add_delayed (fc->poll_time, &tunnel_poll, fc); } queue = GNUNET_malloc (sizeof (struct MeshPeerQueue)); queue->cls = cls; queue->type = type; queue->size = size; queue->peer = dst; queue->tunnel = t; if (GNUNET_YES == priority) { struct GNUNET_MESH_Data *d; uint32_t prev; uint32_t next; GNUNET_CONTAINER_DLL_insert (dst->queue_head, dst->queue_tail, queue); d = (struct GNUNET_MESH_Data *) queue->cls; prev = d->pid; for (queue = dst->queue_tail; NULL != queue; queue = queue->prev) { if (queue->type != type) continue; d = (struct GNUNET_MESH_Data *) queue->cls; next = d->pid; d->pid = prev; prev = next; } } else GNUNET_CONTAINER_DLL_insert_tail (dst->queue_head, dst->queue_tail, queue); if (NULL == dst->core_transmit) { dst->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, 0, 0, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_PEER_resolve2 (dst->id), size, &queue_send, dst); } t->pending_messages++; } /******************************************************************************/ /******************** MESH NETWORK HANDLERS **************************/ /******************************************************************************/ /** * Core handler for path creation * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @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) { unsigned int own_pos; uint16_t size; uint16_t i; MESH_TunnelNumber tid; struct GNUNET_MESH_CreateTunnel *msg; struct GNUNET_PeerIdentity *pi; struct MeshPeerPath *path; struct MeshPeer *dest_peer_info; struct MeshPeer *orig_peer_info; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path create msg [%s]\n", GNUNET_i2s (&my_full_id)); size = ntohs (message->size); if (size < sizeof (struct GNUNET_MESH_CreateTunnel)) { GNUNET_break_op (0); return GNUNET_OK; } size -= sizeof (struct GNUNET_MESH_CreateTunnel); if (size % sizeof (struct GNUNET_PeerIdentity)) { GNUNET_break_op (0); return GNUNET_OK; } size /= sizeof (struct GNUNET_PeerIdentity); if (size < 1) { GNUNET_break_op (0); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path has %u hops.\n", size); msg = (struct GNUNET_MESH_CreateTunnel *) message; tid = ntohl (msg->tid); pi = (struct GNUNET_PeerIdentity *) &msg[1]; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " path is for tunnel %s[%X]:%u.\n", GNUNET_i2s (pi), tid, ntohl (msg->port)); t = tunnel_get (pi, tid); if (NULL == t) /* might be a local tunnel */ { uint32_t opt; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating tunnel\n"); t = tunnel_new (GNUNET_PEER_intern (pi), tid, NULL, 0); if (NULL == t) { GNUNET_break (0); return GNUNET_OK; } t->port = ntohl (msg->port); opt = ntohl (msg->opt); if (0 != (opt & GNUNET_MESH_OPTION_NOBUFFER)) { t->nobuffer = GNUNET_YES; t->queue_max = 1; } if (0 != (opt & GNUNET_MESH_OPTION_RELIABLE)) { t->reliable = GNUNET_YES; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " nobuffer:%d\n", t->nobuffer); } tunnel_reset_timeout (t, GNUNET_YES); tunnel_change_state (t, MESH_TUNNEL_WAITING); dest_peer_info = GNUNET_CONTAINER_multipeermap_get (peers, &pi[size - 1]); if (NULL == dest_peer_info) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating PeerInfo for destination.\n"); dest_peer_info = GNUNET_malloc (sizeof (struct MeshPeer)); dest_peer_info->id = GNUNET_PEER_intern (&pi[size - 1]); GNUNET_CONTAINER_multipeermap_put (peers, &pi[size - 1], dest_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } orig_peer_info = GNUNET_CONTAINER_multipeermap_get (peers, pi); if (NULL == orig_peer_info) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating PeerInfo for origin.\n"); orig_peer_info = GNUNET_new (struct MeshPeer); orig_peer_info->id = GNUNET_PEER_intern (pi); GNUNET_CONTAINER_multipeermap_put (peers, pi, orig_peer_info, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Creating path...\n"); path = path_new (size); own_pos = 0; for (i = 0; i < size; i++) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... adding %s\n", GNUNET_i2s (&pi[i])); path->peers[i] = GNUNET_PEER_intern (&pi[i]); if (path->peers[i] == myid) own_pos = i; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Own position: %u\n", own_pos); if (own_pos == 0 && path->peers[own_pos] != myid) { /* create path: self not found in path through self */ GNUNET_break_op (0); path_destroy (path); tunnel_destroy (t); return GNUNET_OK; } path_add_to_peers (path, GNUNET_NO); tunnel_use_path (t, path); peer_add_tunnel (dest_peer_info, t); if (own_pos == size - 1) { struct MeshClient *c; /* Find target client */ c = GNUNET_CONTAINER_multihashmap32_get (ports, t->port); if (NULL == c) { /* TODO send reject */ return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); peer_add_path_to_origin (orig_peer_info, path, GNUNET_YES); /* This can be a retransmission due to a lost PATH ACK. * Check if we already have a destination client for the tunnel. */ if (t->client != c) { /* Assign local tid */ while (NULL != tunnel_get_incoming (next_local_tid)) next_local_tid = (next_local_tid + 1) | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; t->local_tid_dest = next_local_tid++; next_local_tid = next_local_tid | GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; if (GNUNET_YES == t->reliable) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n"); t->bck_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability)); t->bck_rel->t = t; t->bck_rel->expected_delay = MESH_RETRANSMIT_TIME; } tunnel_add_client (t, c); send_local_tunnel_create (t); } send_path_ack (t); /* Eliminate tunnel when origin dies */ tunnel_reset_timeout (t, GNUNET_YES); /* Keep tunnel alive in direction dest->owner*/ tunnel_reset_timeout (t, GNUNET_NO); } else { struct MeshPeerPath *path2; t->next_hop = path->peers[own_pos + 1]; GNUNET_PEER_change_rc(t->next_hop, 1); /* It's for somebody else! Retransmit. */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Retransmitting.\n"); path2 = path_duplicate (path); peer_add_path (dest_peer_info, path2, GNUNET_NO); peer_add_path_to_origin (orig_peer_info, path, GNUNET_NO); send_path_create (t); } return GNUNET_OK; } /** * Core handler for path ACKs * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_path_ack (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PathACK *msg; struct MeshPeer *peer_info; struct MeshPeerPath *p; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a path ACK msg [%s]\n", GNUNET_i2s (&my_full_id)); msg = (struct GNUNET_MESH_PathACK *) message; t = tunnel_get (&msg->oid, ntohl(msg->tid)); if (NULL == t) { /* TODO notify that we don't know the tunnel */ GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " don't know the tunnel %s [%X]!\n", GNUNET_i2s (&msg->oid), ntohl(msg->tid)); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %s [%X]\n", GNUNET_i2s (&msg->oid), ntohl(msg->tid)); peer_info = peer_get (&msg->peer_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by peer %s\n", GNUNET_i2s (&msg->peer_id)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " via peer %s\n", GNUNET_i2s (peer)); /* Add path to peers? */ p = t->path; if (NULL != p) { path_add_to_peers (p, GNUNET_YES); } else { GNUNET_break (0); } tunnel_change_state (t, MESH_TUNNEL_READY); tunnel_reset_timeout (t, GNUNET_NO); t->next_fc.last_ack_recv = (NULL == t->client) ? ntohl (msg->ack) : 0; t->prev_fc.last_ack_sent = ntohl (msg->ack); /* Message for us? */ if (0 == memcmp (&msg->oid, &my_full_id, sizeof (struct GNUNET_PeerIdentity))) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " It's for us!\n"); if (NULL == t->owner) { GNUNET_break_op (0); return GNUNET_OK; } if (NULL != peer_info->dhtget) { GNUNET_DHT_get_stop (peer_info->dhtget); peer_info->dhtget = NULL; } tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_YES); tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, GNUNET_NO); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); send_prebuilt_message (message, t->prev_hop, t); return GNUNET_OK; } /** * Core handler for notifications of broken paths * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_path_broken (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_PathBroken *msg; struct MeshTunnel *t; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Received a PATH BROKEN msg from %s\n", GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_PathBroken *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer1)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " regarding %s\n", GNUNET_i2s (&msg->peer2)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { GNUNET_break_op (0); return GNUNET_OK; } tunnel_notify_connection_broken (t, GNUNET_PEER_search (&msg->peer1), GNUNET_PEER_search (&msg->peer2)); return GNUNET_OK; } /** * Core handler for tunnel destruction * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_tunnel_destroy (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelDestroy *msg; struct MeshTunnel *t; msg = (struct GNUNET_MESH_TunnelDestroy *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a TUNNEL DESTROY packet from %s\n", GNUNET_i2s (peer)); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for tunnel %s [%u]\n", GNUNET_i2s (&msg->oid), ntohl (msg->tid)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* Probably already got the message from another path, * destroyed the tunnel and retransmitted to children. * Safe to ignore. */ GNUNET_STATISTICS_update (stats, "# control on unknown tunnel", 1, GNUNET_NO); return GNUNET_OK; } if (t->local_tid_dest >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "INCOMING TUNNEL %X %X\n", t->local_tid, t->local_tid_dest); } if (GNUNET_PEER_search (peer) == t->prev_hop) { // TODO check owner's signature // TODO add owner's signatue to tunnel for retransmission peer_cancel_queues (t->prev_hop, t); GNUNET_PEER_change_rc (t->prev_hop, -1); t->prev_hop = 0; } else if (GNUNET_PEER_search (peer) == t->next_hop) { // TODO check dest's signature // TODO add dest's signatue to tunnel for retransmission peer_cancel_queues (t->next_hop, t); GNUNET_PEER_change_rc (t->next_hop, -1); t->next_hop = 0; } else { GNUNET_break_op (0); // TODO check both owner AND destination's signature to see which matches // TODO restransmit in appropriate direction return GNUNET_OK; } tunnel_destroy_empty (t); // TODO: add timeout to destroy the tunnel anyway return GNUNET_OK; } /** * Generic handler for mesh network payload traffic. * * @param peer Peer identity this notification is about. * @param message Data message. * @param fwd Is this FWD traffic? GNUNET_YES : GNUNET_NO; * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data (const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message, int fwd) { struct GNUNET_MESH_Data *msg; struct MeshFlowControl *fc; struct MeshTunnelReliability *rel; struct MeshTunnel *t; struct MeshClient *c; GNUNET_PEER_Id hop; uint32_t pid; uint32_t ttl; uint16_t type; size_t size; /* Check size */ size = ntohs (message->size); if (size < sizeof (struct GNUNET_MESH_Data) + sizeof (struct GNUNET_MessageHeader)) { GNUNET_break (0); return GNUNET_OK; } type =ntohs (message->type); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a %s message from %s\n", GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_Data *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (msg[1].header.type))); /* Check tunnel */ t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify back: we don't know this tunnel */ GNUNET_STATISTICS_update (stats, "# data on unknown tunnel", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING tunnel unknown\n"); return GNUNET_OK; } /* Initialize FWD/BCK data */ pid = ntohl (msg->pid); fc = fwd ? &t->prev_fc : &t->next_fc; c = fwd ? t->client : t->owner; rel = fwd ? t->bck_rel : t->fwd_rel; hop = fwd ? t->next_hop : t->prev_hop; if (GMC_is_pid_bigger (pid, fc->last_ack_sent)) { GNUNET_STATISTICS_update (stats, "# unsolicited data", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "WARNING Received PID %u, (prev %u), ACK %u\n", pid, fc->last_pid_recv, fc->last_ack_sent); return GNUNET_OK; } if (NULL != c) tunnel_change_state (t, MESH_TUNNEL_READY); tunnel_reset_timeout (t, fwd); if (NULL != c) { /* TODO signature verification */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " it's for us! sending to client\n"); GNUNET_STATISTICS_update (stats, "# data received", 1, GNUNET_NO); if (GMC_is_pid_bigger (pid, fc->last_pid_recv)) { uint32_t mid; mid = ntohl (msg->mid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " pid %u (mid %u) not seen yet\n", pid, mid); fc->last_pid_recv = pid; if (GNUNET_NO == t->reliable || ( !GMC_is_pid_bigger (rel->mid_recv, mid) && GMC_is_pid_bigger (rel->mid_recv + 64, mid) ) ) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! RECV %u\n", ntohl (msg->mid)); if (GNUNET_YES == t->reliable) { /* Is this the exact next expected messasge? */ if (mid == rel->mid_recv) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "as expected\n"); rel->mid_recv++; tunnel_send_client_data (t, msg, fwd); tunnel_send_client_buffered_data (t, c, rel); } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "save for later\n"); tunnel_add_buffered_data (t, msg, rel); } } else /* Tunnel unreliable, send to clients directly */ { tunnel_send_client_data (t, msg, fwd); } } else { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " MID %u not expected (%u - %u), dropping!\n", ntohl (msg->mid), rel->mid_recv, rel->mid_recv + 64); } } else { // GNUNET_STATISTICS_update (stats, "# duplicate PID", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " Pid %u not expected (%u+), dropping!\n", pid, fc->last_pid_recv + 1); } tunnel_send_ack (t, type, fwd); return GNUNET_OK; } fc->last_pid_recv = pid; if (0 == hop) { GNUNET_STATISTICS_update (stats, "# data on dying tunnel", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "data on dying tunnel %s[%X]\n", GNUNET_PEER_resolve2 (t->id.oid), ntohl (msg->tid)); return GNUNET_OK; /* Next hop has destoyed the tunnel, drop */ } ttl = ntohl (msg->ttl); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ttl: %u\n", ttl); if (ttl == 0) { GNUNET_STATISTICS_update (stats, "# TTL drops", 1, GNUNET_NO); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " TTL is 0, DROPPING!\n"); tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, fwd); return GNUNET_OK; } if (myid != hop) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " not for us, retransmitting...\n"); send_prebuilt_message (message, hop, t); GNUNET_STATISTICS_update (stats, "# unicast forwarded", 1, GNUNET_NO); } return GNUNET_OK; } /** * Core handler for mesh network traffic going from the origin to a peer * * @param cls Closure (unused). * @param message Message received. * @param peer Peer who sent the message. * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_unicast (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { return handle_mesh_data (peer, message, GNUNET_YES); } /** * Core handler for mesh network traffic towards the owner of a tunnel. * * @param cls Closure (unused). * @param message Message received. * @param peer Peer who sent the message. * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_to_orig (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { return handle_mesh_data (peer, message, GNUNET_NO); } /** * Core handler for mesh network traffic end-to-end ACKs. * * @param cls Closure. * @param message Message. * @param peer Peer identity this notification is about. * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_data_ack (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_DataACK *msg; struct MeshTunnelReliability *rel; struct MeshReliableMessage *copy; struct MeshReliableMessage *next; struct MeshTunnel *t; GNUNET_PEER_Id id; uint32_t ack; uint16_t type; int work; type = ntohs (message->type); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a %s message from %s!\n", GNUNET_MESH_DEBUG_M2S (type), GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_DataACK *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know this tunnel (whom)? */ GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO); return GNUNET_OK; } ack = ntohl (msg->mid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); /* Is this a forward or backward ACK? */ id = GNUNET_PEER_search (peer); if (t->next_hop == id && GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n"); if (NULL == t->owner) { send_prebuilt_message (message, t->prev_hop, t); return GNUNET_OK; } rel = t->fwd_rel; } else if (t->prev_hop == id && GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK == type) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n"); if (NULL == t->client) { send_prebuilt_message (message, t->next_hop, t); return GNUNET_OK; } rel = t->bck_rel; } else { GNUNET_break_op (0); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! ACK %u\n", ack); for (work = GNUNET_NO, copy = rel->head_sent; copy != NULL; copy = next) { if (GMC_is_pid_bigger (copy->mid, ack)) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! head %u, out!\n", copy->mid); tunnel_free_sent_reliable (t, msg, rel); break; } work = GNUNET_YES; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! id %u\n", copy->mid); next = copy->next; tunnel_free_reliable_message (copy); } /* Once buffers have been free'd, send ACK */ tunnel_send_ack (t, type, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK == type); /* If some message was free'd, update the retransmission delay*/ if (GNUNET_YES == work) { if (GNUNET_SCHEDULER_NO_TASK != rel->retry_task) { GNUNET_SCHEDULER_cancel (rel->retry_task); if (NULL == rel->head_sent) { rel->retry_task = GNUNET_SCHEDULER_NO_TASK; } else { struct GNUNET_TIME_Absolute new_target; struct GNUNET_TIME_Relative delay; delay = GNUNET_TIME_relative_multiply (rel->retry_timer, MESH_RETRANSMIT_MARGIN); new_target = GNUNET_TIME_absolute_add (rel->head_sent->timestamp, delay); delay = GNUNET_TIME_absolute_get_remaining (new_target); rel->retry_task = GNUNET_SCHEDULER_add_delayed (delay, &tunnel_retransmit_message, rel); } } else GNUNET_break (0); } return GNUNET_OK; } /** * Core handler for mesh network traffic point-to-point acks. * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_ack (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_ACK *msg; struct MeshTunnel *t; struct MeshFlowControl *fc; GNUNET_PEER_Id id; uint32_t ack; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK packet from %s!\n", GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_ACK *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know this tunnel (whom)? */ GNUNET_STATISTICS_update (stats, "# ack on unknown tunnel", 1, GNUNET_NO); return GNUNET_OK; } ack = ntohl (msg->pid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ACK %u\n", ack); /* Is this a forward or backward ACK? */ id = GNUNET_PEER_search (peer); if (t->next_hop == id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " FWD ACK\n"); fc = &t->next_fc; } else if (t->prev_hop == id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " BCK ACK\n"); fc = &t->prev_fc; } else { GNUNET_break_op (0); return GNUNET_OK; } if (GNUNET_SCHEDULER_NO_TASK != fc->poll_task && GMC_is_pid_bigger (ack, fc->last_ack_recv)) { GNUNET_SCHEDULER_cancel (fc->poll_task); fc->poll_task = GNUNET_SCHEDULER_NO_TASK; fc->poll_time = GNUNET_TIME_UNIT_SECONDS; } fc->last_ack_recv = ack; peer_unlock_queue (id); tunnel_change_state (t, MESH_TUNNEL_READY); tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_ACK, t->next_hop == id); return GNUNET_OK; } /** * Core handler for mesh network traffic point-to-point ack polls. * * @param cls closure * @param message message * @param peer peer identity this notification is about * * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) */ static int handle_mesh_poll (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_Poll *msg; struct MeshTunnel *t; struct MeshFlowControl *fc; GNUNET_PEER_Id id; uint32_t pid; uint32_t old; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a POLL packet from %s!\n", GNUNET_i2s (peer)); msg = (struct GNUNET_MESH_Poll *) message; t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know this tunnel (whom)? */ GNUNET_STATISTICS_update (stats, "# poll on unknown tunnel", 1, GNUNET_NO); GNUNET_break_op (0); return GNUNET_OK; } /* Is this a forward or backward ACK? */ id = GNUNET_PEER_search (peer); pid = ntohl (msg->pid); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " PID %u\n", pid); if (t->next_hop == id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from FWD\n"); fc = &t->next_fc; old = fc->last_pid_recv; } else if (t->prev_hop == id) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " from BCK\n"); fc = &t->prev_fc; old = fc->last_pid_recv; } else { GNUNET_break (0); return GNUNET_OK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " was %u\n", fc->last_pid_recv); fc->last_pid_recv = pid; tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_POLL, t->prev_hop == id); if (GNUNET_YES == t->reliable) fc->last_pid_recv = old; return GNUNET_OK; } /** * Core handler for mesh keepalives. * * @param cls closure * @param message message * @param peer peer identity this notification is about * @return GNUNET_OK to keep the connection open, * GNUNET_SYSERR to close it (signal serious error) * * TODO: Check who we got this from, to validate route. */ static int handle_mesh_keepalive (void *cls, const struct GNUNET_PeerIdentity *peer, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelKeepAlive *msg; struct MeshTunnel *t; struct MeshClient *c; GNUNET_PEER_Id hop; int fwd; msg = (struct GNUNET_MESH_TunnelKeepAlive *) message; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "got a keepalive packet from %s\n", GNUNET_i2s (peer)); t = tunnel_get (&msg->oid, ntohl (msg->tid)); if (NULL == t) { /* TODO notify that we dont know that tunnel */ GNUNET_STATISTICS_update (stats, "# keepalive on unknown tunnel", 1, GNUNET_NO); return GNUNET_OK; } fwd = GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE == ntohs (message->type) ? GNUNET_YES : GNUNET_NO; c = fwd ? t->client : t->owner; hop = fwd ? t->next_hop : t->prev_hop; if (NULL != c) tunnel_change_state (t, MESH_TUNNEL_READY); tunnel_reset_timeout (t, fwd); if (NULL != c || 0 == hop || myid == hop) return GNUNET_OK; GNUNET_STATISTICS_update (stats, "# keepalives forwarded", 1, GNUNET_NO); send_prebuilt_message (message, hop, t); return GNUNET_OK; } /** * Functions to handle messages from core */ static struct GNUNET_CORE_MessageHandler core_handlers[] = { {&handle_mesh_path_create, GNUNET_MESSAGE_TYPE_MESH_PATH_CREATE, 0}, {&handle_mesh_path_broken, GNUNET_MESSAGE_TYPE_MESH_PATH_BROKEN, sizeof (struct GNUNET_MESH_PathBroken)}, {&handle_mesh_tunnel_destroy, GNUNET_MESSAGE_TYPE_MESH_TUNNEL_DESTROY, sizeof (struct GNUNET_MESH_TunnelDestroy)}, {&handle_mesh_unicast, GNUNET_MESSAGE_TYPE_MESH_UNICAST, 0}, {&handle_mesh_to_orig, GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN, 0}, {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_UNICAST_ACK, sizeof (struct GNUNET_MESH_DataACK)}, {&handle_mesh_data_ack, GNUNET_MESSAGE_TYPE_MESH_TO_ORIG_ACK, sizeof (struct GNUNET_MESH_DataACK)}, {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_FWD_KEEPALIVE, sizeof (struct GNUNET_MESH_TunnelKeepAlive)}, {&handle_mesh_keepalive, GNUNET_MESSAGE_TYPE_MESH_BCK_KEEPALIVE, sizeof (struct GNUNET_MESH_TunnelKeepAlive)}, {&handle_mesh_ack, GNUNET_MESSAGE_TYPE_MESH_ACK, sizeof (struct GNUNET_MESH_ACK)}, {&handle_mesh_poll, GNUNET_MESSAGE_TYPE_MESH_POLL, sizeof (struct GNUNET_MESH_Poll)}, {&handle_mesh_path_ack, GNUNET_MESSAGE_TYPE_MESH_PATH_ACK, sizeof (struct GNUNET_MESH_PathACK)}, {NULL, 0, 0} }; /** * Function to process paths received for a new peer addition. The recorded * paths form the initial tunnel, which can be optimized later. * Called on each result obtained for the DHT search. * * @param cls closure * @param exp when will this value expire * @param key key of the result * @param get_path path of the get request * @param get_path_length lenght of get_path * @param put_path path of the put request * @param put_path_length length of the put_path * @param type type of the result * @param size number of bytes in data * @param data pointer to the result data */ static void dht_get_id_handler (void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode * key, const struct GNUNET_PeerIdentity *get_path, unsigned int get_path_length, const struct GNUNET_PeerIdentity *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data) { struct MeshPeer *peer = cls; struct MeshPeerPath *p; struct GNUNET_PeerIdentity pi; int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got results from DHT!\n"); GNUNET_PEER_resolve (peer->id, &pi); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " for %s\n", GNUNET_i2s (&pi)); p = path_build_from_dht (get_path, get_path_length, put_path, put_path_length); path_add_to_peers (p, GNUNET_NO); path_destroy (p); for (i = 0; i < peer->ntunnels; i++) { struct GNUNET_PeerIdentity id; GNUNET_PEER_resolve (peer->tunnels[i]->id.oid, &id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... tunnel %s:%X (%X / %X)\n", GNUNET_i2s (&id), peer->tunnels[i]->id.tid, peer->tunnels[i]->local_tid, peer->tunnels[i]->local_tid_dest); if (peer->tunnels[i]->state == MESH_TUNNEL_SEARCHING) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n"); peer_connect (peer, peer->tunnels[i]); } } return; } /******************************************************************************/ /********************* MESH LOCAL HANDLES **************************/ /******************************************************************************/ /** * Handler for client connection. * * @param cls Closure (unused). * @param client Client handler. */ static void handle_local_client_connect (void *cls, struct GNUNET_SERVER_Client *client) { struct MeshClient *c; if (NULL == client) return; c = GNUNET_malloc (sizeof (struct MeshClient)); c->handle = client; GNUNET_SERVER_client_keep (client); GNUNET_SERVER_client_set_user_context (client, c); GNUNET_CONTAINER_DLL_insert (clients_head, clients_tail, c); } /** * Handler for client disconnection * * @param cls closure * @param client identification of the client; NULL * for the last call when the server is destroyed */ static void handle_local_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client) { struct MeshClient *c; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "client disconnected: %p\n", client); if (client == NULL) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " (SERVER DOWN)\n"); return; } c = client_get (client); if (NULL != c) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "matching client found (%u, %p)\n", c->id, c); GNUNET_SERVER_client_drop (c->handle); c->shutting_down = GNUNET_YES; if (NULL != c->own_tunnels) { GNUNET_CONTAINER_multihashmap32_iterate (c->own_tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap32_destroy (c->own_tunnels); } if (NULL != c->incoming_tunnels) { GNUNET_CONTAINER_multihashmap32_iterate (c->incoming_tunnels, &tunnel_destroy_iterator, c); GNUNET_CONTAINER_multihashmap32_destroy (c->incoming_tunnels); } if (NULL != c->ports) { GNUNET_CONTAINER_multihashmap32_iterate (c->ports, &client_release_ports, c); GNUNET_CONTAINER_multihashmap32_destroy (c->ports); } GNUNET_CONTAINER_DLL_remove (clients_head, clients_tail, c); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client free (%p)\n", c); GNUNET_free (c); GNUNET_STATISTICS_update (stats, "# clients", -1, GNUNET_NO); } else { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " context NULL!\n"); } 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; uint32_t *p; unsigned int i; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client connected %p\n", client); /* Check data sanity */ size = ntohs (message->size) - sizeof (struct GNUNET_MESH_ClientConnect); cc_msg = (struct GNUNET_MESH_ClientConnect *) message; if (0 != (size % sizeof (uint32_t))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } size /= sizeof (uint32_t); /* Initialize new client structure */ c = GNUNET_SERVER_client_get_user_context (client, struct MeshClient); c->id = next_client_id++; /* overflow not important: just for debug */ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client id %u\n", c->id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " client has %u ports\n", size); if (size > 0) { uint32_t u32; p = (uint32_t *) &cc_msg[1]; c->ports = GNUNET_CONTAINER_multihashmap32_create (size); for (i = 0; i < size; i++) { u32 = ntohl (p[i]); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " port: %u\n", u32); /* store in client's hashmap */ GNUNET_CONTAINER_multihashmap32_put (c->ports, u32, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); /* store in global hashmap */ /* FIXME only allow one client to have the port open, * have a backup hashmap with waiting clients */ GNUNET_CONTAINER_multihashmap32_put (ports, u32, c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE); } } c->own_tunnels = GNUNET_CONTAINER_multihashmap32_create (32); c->incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32); GNUNET_SERVER_notification_context_add (nc, client); GNUNET_STATISTICS_update (stats, "# clients", 1, GNUNET_NO); GNUNET_SERVER_receive_done (client, GNUNET_OK); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new client processed\n"); } /** * Handler for requests of new tunnels * * @param cls Closure. * @param client Identification of the client. * @param message The actual message. */ static void handle_local_tunnel_create (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelMessage *t_msg; struct MeshPeer *peer_info; struct MeshTunnel *t; struct MeshClient *c; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "new tunnel requested\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); /* Message size 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; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " towards %s:%u\n", GNUNET_i2s (&t_msg->peer), ntohl (t_msg->port)); tid = ntohl (t_msg->tunnel_id); /* Sanity check for duplicate tunnel IDs */ if (NULL != tunnel_get_by_local_id (c, tid)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Create tunnel */ while (NULL != tunnel_get_by_pi (myid, next_tid)) next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; t = tunnel_new (myid, next_tid, c, tid); next_tid = (next_tid + 1) & ~GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } t->port = ntohl (t_msg->port); tunnel_set_options (t, ntohl (t_msg->opt)); if (GNUNET_YES == t->reliable) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! Reliable\n"); t->fwd_rel = GNUNET_malloc (sizeof (struct MeshTunnelReliability)); t->fwd_rel->t = t; t->fwd_rel->expected_delay = MESH_RETRANSMIT_TIME; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "CREATED TUNNEL %s[%x]:%u (%x)\n", GNUNET_i2s (&my_full_id), t->id.tid, t->port, t->local_tid); peer_info = peer_get (&t_msg->peer); peer_add_tunnel (peer_info, t); peer_connect (peer_info, t); tunnel_reset_timeout (t, GNUNET_YES); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for requests of deleting tunnels * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_tunnel_destroy (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_TunnelMessage *tunnel_msg; struct MeshClient *c; struct MeshTunnel *t; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a DESTROY TUNNEL from client!\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); /* Message sanity check */ if (sizeof (struct GNUNET_MESH_TunnelMessage) != ntohs (message->size)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } tunnel_msg = (struct GNUNET_MESH_TunnelMessage *) message; /* Retrieve tunnel */ tid = ntohl (tunnel_msg->tunnel_id); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X not found\n", tid); GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Cleanup after the tunnel */ client_delete_tunnel (c, t); if (c == t->client && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV <= tid) { t->client = NULL; } else if (c == t->owner && GNUNET_MESH_LOCAL_TUNNEL_ID_SERV > tid) { peer_remove_tunnel (peer_get_short (t->dest), t); t->owner = NULL; } else { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " tunnel %X client %p (%p, %p)\n", tid, c, t->owner, t->client); GNUNET_break (0); } /* The tunnel will be destroyed when the last message is transmitted. */ tunnel_destroy_empty (t); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for client traffic * * @param cls closure * @param client identification of the client * @param message the actual message */ static void handle_local_data (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_LocalData *data_msg; struct MeshClient *c; struct MeshTunnel *t; struct MeshFlowControl *fc; MESH_TunnelNumber tid; size_t size; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got data from a client!\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); data_msg = (struct GNUNET_MESH_LocalData *) message; /* Sanity check for message size */ size = ntohs (message->size) - sizeof (struct GNUNET_MESH_LocalData); if (size < sizeof (struct GNUNET_MessageHeader)) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Tunnel exists? */ tid = ntohl (data_msg->tid); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Is the client in the tunnel? */ if ( !( (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV && t->owner && t->owner->handle == client) || (tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV && t->client && t->client->handle == client) ) ) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Ok, everything is correct, send the message * (pretend we got it from a mesh peer) */ { struct GNUNET_MESH_Data *payload; char cbuf[sizeof(struct GNUNET_MESH_Data) + size]; fc = tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? &t->prev_fc : &t->next_fc; if (GNUNET_YES == t->reliable) { struct MeshTunnelReliability *rel; struct MeshReliableMessage *copy; rel = (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) ? t->fwd_rel : t->bck_rel; copy = GNUNET_malloc (sizeof (struct MeshReliableMessage) + sizeof(struct GNUNET_MESH_Data) + size); copy->mid = rel->mid_sent++; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "!!! DATA %u\n", copy->mid); copy->timestamp = GNUNET_TIME_absolute_get (); copy->rel = rel; rel->n_sent++; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " n_sent %u\n", rel->n_sent); GNUNET_CONTAINER_DLL_insert_tail (rel->head_sent, rel->tail_sent, copy); if (GNUNET_SCHEDULER_NO_TASK == rel->retry_task) { rel->retry_timer = GNUNET_TIME_relative_multiply (rel->expected_delay, MESH_RETRANSMIT_MARGIN); rel->retry_task = GNUNET_SCHEDULER_add_delayed (rel->retry_timer, &tunnel_retransmit_message, rel); } payload = (struct GNUNET_MESH_Data *) ©[1]; payload->mid = htonl (copy->mid); } else { payload = (struct GNUNET_MESH_Data *) cbuf; payload->mid = htonl (fc->last_pid_recv + 1); } memcpy (&payload[1], &data_msg[1], size); payload->header.size = htons (sizeof (struct GNUNET_MESH_Data) + size); payload->header.type = htons (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV ? GNUNET_MESSAGE_TYPE_MESH_UNICAST : GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN); GNUNET_PEER_resolve(t->id.oid, &payload->oid);; payload->tid = htonl (t->id.tid); payload->ttl = htonl (default_ttl); payload->pid = htonl (fc->last_pid_recv + 1); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " calling generic handler...\n"); if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) handle_mesh_unicast (NULL, &my_full_id, &payload->header); else handle_mesh_to_orig (NULL, &my_full_id, &payload->header); } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "receive done OK\n"); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Handler for client's ACKs for payload traffic. * * @param cls Closure (unused). * @param client Identification of the client. * @param message The actual message. */ static void handle_local_ack (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_LocalAck *msg; struct MeshTunnel *t; struct MeshClient *c; MESH_TunnelNumber tid; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Got a local ACK\n"); /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " by client %u\n", c->id); msg = (struct GNUNET_MESH_LocalAck *) message; /* Tunnel exists? */ tid = ntohl (msg->tunnel_id); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tid); t = tunnel_get_by_local_id (c, tid); if (NULL == t) { GNUNET_break (0); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Tunnel %X unknown.\n", tid); GNUNET_log (GNUNET_ERROR_TYPE_WARNING, " for client %u.\n", c->id); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } /* Does client own tunnel? I.E: Is this an ACK for BCK traffic? */ if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { /* The client owns the tunnel, ACK is for data to_origin, send BCK ACK. */ t->prev_fc.last_ack_recv++; tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_NO); } else { /* The client doesn't own the tunnel, this ACK is for FWD traffic. */ t->next_fc.last_ack_recv++; tunnel_send_ack (t, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, GNUNET_YES); } GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /** * Iterator over all tunnels to send a monitoring client info about each tunnel. * * @param cls Closure (client handle). * @param key Key (hashed tunnel ID, unused). * @param value Tunnel info. * * @return GNUNET_YES, to keep iterating. */ static int monitor_all_tunnels_iterator (void *cls, const struct GNUNET_HashCode * key, void *value) { struct GNUNET_SERVER_Client *client = cls; struct MeshTunnel *t = value; struct GNUNET_MESH_LocalMonitor *msg; msg = GNUNET_malloc (sizeof(struct GNUNET_MESH_LocalMonitor)); GNUNET_PEER_resolve(t->id.oid, &msg->owner); msg->tunnel_id = htonl (t->id.tid); msg->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor)); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS); GNUNET_PEER_resolve (t->dest, &msg->destination); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "* sending info about tunnel %s [%u]\n", GNUNET_i2s (&msg->owner), t->id.tid); GNUNET_SERVER_notification_context_unicast (nc, client, &msg->header, GNUNET_NO); return GNUNET_YES; } /** * Handler for client's MONITOR request. * * @param cls Closure (unused). * @param client Identification of the client. * @param message The actual message. */ static void handle_local_get_tunnels (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { struct MeshClient *c; /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Received get tunnels request from client %u\n", c->id); GNUNET_CONTAINER_multihashmap_iterate (tunnels, monitor_all_tunnels_iterator, client); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Get tunnels request from client %u completed\n", c->id); GNUNET_SERVER_receive_done (client, GNUNET_OK); } /** * Handler for client's MONITOR_TUNNEL request. * * @param cls Closure (unused). * @param client Identification of the client. * @param message The actual message. */ static void handle_local_show_tunnel (void *cls, struct GNUNET_SERVER_Client *client, const struct GNUNET_MessageHeader *message) { const struct GNUNET_MESH_LocalMonitor *msg; struct GNUNET_MESH_LocalMonitor *resp; struct MeshClient *c; struct MeshTunnel *t; /* Sanity check for client registration */ if (NULL == (c = client_get (client))) { GNUNET_break (0); GNUNET_SERVER_receive_done (client, GNUNET_SYSERR); return; } msg = (struct GNUNET_MESH_LocalMonitor *) message; GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Received tunnel info request from client %u for tunnel %s[%X]\n", c->id, &msg->owner, ntohl (msg->tunnel_id)); t = tunnel_get (&msg->owner, ntohl (msg->tunnel_id)); if (NULL == t) { /* We don't know the tunnel FIXME */ struct GNUNET_MESH_LocalMonitor warn; warn = *msg; GNUNET_SERVER_notification_context_unicast (nc, client, &warn.header, GNUNET_NO); GNUNET_SERVER_receive_done (client, GNUNET_OK); return; } /* Initialize context */ resp = GNUNET_malloc (sizeof (struct GNUNET_MESH_LocalMonitor)); *resp = *msg; GNUNET_PEER_resolve (t->dest, &resp->destination); resp->header.size = htons (sizeof (struct GNUNET_MESH_LocalMonitor)); GNUNET_SERVER_notification_context_unicast (nc, c->handle, &resp->header, GNUNET_NO); GNUNET_free (resp); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Monitor tunnel request from client %u completed\n", c->id); GNUNET_SERVER_receive_done (client, GNUNET_OK); } /** * Functions to handle messages from clients */ static struct GNUNET_SERVER_MessageHandler client_handlers[] = { {&handle_local_new_client, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT, 0}, {&handle_local_tunnel_create, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE, sizeof (struct GNUNET_MESH_TunnelMessage)}, {&handle_local_tunnel_destroy, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY, sizeof (struct GNUNET_MESH_TunnelMessage)}, {&handle_local_data, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA, 0}, {&handle_local_ack, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK, sizeof (struct GNUNET_MESH_LocalAck)}, {&handle_local_get_tunnels, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS, sizeof (struct GNUNET_MessageHeader)}, {&handle_local_show_tunnel, NULL, GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL, sizeof (struct GNUNET_MESH_LocalMonitor)}, {NULL, NULL, 0, 0} }; /** * Method called whenever a given peer connects. * * @param cls closure * @param peer peer identity this notification is about */ static void core_connect (void *cls, const struct GNUNET_PeerIdentity *peer) { struct MeshPeer *peer_info; struct MeshPeerPath *path; DEBUG_CONN ("Peer connected\n"); DEBUG_CONN (" %s\n", GNUNET_i2s (&my_full_id)); peer_info = peer_get (peer); if (myid == peer_info->id) { DEBUG_CONN (" (self)\n"); path = path_new (1); } else { DEBUG_CONN (" %s\n", GNUNET_i2s (peer)); path = path_new (2); path->peers[1] = peer_info->id; GNUNET_PEER_change_rc (peer_info->id, 1); GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO); } path->peers[0] = myid; GNUNET_PEER_change_rc (myid, 1); peer_add_path (peer_info, path, GNUNET_YES); return; } /** * Method called whenever a peer disconnects. * * @param cls closure * @param peer peer identity this notification is about */ static void core_disconnect (void *cls, const struct GNUNET_PeerIdentity *peer) { struct MeshPeer *pi; struct MeshPeerQueue *q; struct MeshPeerQueue *n; DEBUG_CONN ("Peer disconnected\n"); pi = GNUNET_CONTAINER_multipeermap_get (peers, peer); if (NULL == pi) { GNUNET_break (0); return; } q = pi->queue_head; while (NULL != q) { n = q->next; /* TODO try to reroute this traffic instead */ queue_destroy(q, GNUNET_YES); q = n; } if (NULL != pi->core_transmit) { GNUNET_CORE_notify_transmit_ready_cancel(pi->core_transmit); pi->core_transmit = NULL; } peer_remove_path (pi, pi->id, myid); if (myid == pi->id) { DEBUG_CONN (" (self)\n"); } GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO); return; } /** * Install server (service) handlers and start listening to clients. */ static void server_init (void) { GNUNET_SERVER_add_handlers (server_handle, client_handlers); GNUNET_SERVER_connect_notify (server_handle, &handle_local_client_connect, NULL); GNUNET_SERVER_disconnect_notify (server_handle, &handle_local_client_disconnect, NULL); nc = GNUNET_SERVER_notification_context_create (server_handle, 1); clients_head = NULL; clients_tail = NULL; next_client_id = 0; GNUNET_SERVER_resume (server_handle); } /** * To be called on core init/fail. * * @param cls Closure (config) * @param identity the public identity of this peer */ static void core_init (void *cls, const struct GNUNET_PeerIdentity *identity) { const struct GNUNET_CONFIGURATION_Handle *c = cls; static int i = 0; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Core init\n"); if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id))) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n")); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity)); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " my id %s\n", GNUNET_i2s (&my_full_id)); GNUNET_CORE_disconnect (core_handle); core_handle = GNUNET_CORE_connect (c, /* Main configuration */ NULL, /* Closure passed to MESH functions */ &core_init, /* Call core_init once connected */ &core_connect, /* Handle connects */ &core_disconnect, /* remove peers on disconnects */ NULL, /* Don't notify about all incoming messages */ GNUNET_NO, /* For header only in notification */ NULL, /* Don't notify about all outbound messages */ GNUNET_NO, /* For header-only out notification */ core_handlers); /* Register these handlers */ if (10 < i++) GNUNET_abort(); } server_init (); return; } /******************************************************************************/ /************************ MAIN FUNCTIONS ****************************/ /******************************************************************************/ /** * Iterator over tunnel hash map entries to destroy the tunnel during shutdown. * * @param cls closure * @param key current key code * @param value value in the hash map * @return GNUNET_YES if we should continue to iterate, * GNUNET_NO if not. */ static int shutdown_tunnel (void *cls, const struct GNUNET_HashCode * key, void *value) { struct MeshTunnel *t = value; tunnel_destroy (t); return GNUNET_YES; } /** * Iterator over peer hash map entries to destroy the tunnel during shutdown. * * @param cls closure * @param key current key code * @param value value in the hash map * @return GNUNET_YES if we should continue to iterate, * GNUNET_NO if not. */ static int shutdown_peer (void *cls, const struct GNUNET_PeerIdentity *key, void *value) { struct MeshPeer *p = value; struct MeshPeerQueue *q; struct MeshPeerQueue *n; q = p->queue_head; while (NULL != q) { n = q->next; if (q->peer == p) { queue_destroy(q, GNUNET_YES); } q = n; } peer_destroy (p); return GNUNET_YES; } /** * Task run during shutdown. * * @param cls unused * @param tc unused */ static void shutdown_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shutting down\n"); if (core_handle != NULL) { GNUNET_CORE_disconnect (core_handle); core_handle = NULL; } GNUNET_CONTAINER_multihashmap_iterate (tunnels, &shutdown_tunnel, NULL); GNUNET_CONTAINER_multipeermap_iterate (peers, &shutdown_peer, NULL); if (dht_handle != NULL) { GNUNET_DHT_disconnect (dht_handle); dht_handle = NULL; } if (nc != NULL) { GNUNET_SERVER_notification_context_destroy (nc); nc = NULL; } if (GNUNET_SCHEDULER_NO_TASK != announce_id_task) { GNUNET_SCHEDULER_cancel (announce_id_task); announce_id_task = GNUNET_SCHEDULER_NO_TASK; } GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "shut down\n"); } /** * Process mesh requests. * * @param cls closure * @param server the initialized server * @param c configuration to use */ static void run (void *cls, struct GNUNET_SERVER_Handle *server, const struct GNUNET_CONFIGURATION_Handle *c) { char *keyfile; struct GNUNET_CRYPTO_EccPrivateKey *pk; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "starting to run\n"); server_handle = server; GNUNET_SERVER_suspend (server_handle); if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_filename (c, "PEER", "PRIVATE_KEY", &keyfile)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "peer/privatekey"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (c, "MESH", "REFRESH_PATH_TIME", &refresh_path_time)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "refresh path time"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (c, "MESH", "ID_ANNOUNCE_TIME", &id_announce_time)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "id announce time"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_time (c, "MESH", "CONNECT_TIMEOUT", &connect_timeout)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "connect timeout"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_MSGS_QUEUE", &max_msgs_queue)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "max msgs queue"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_TUNNELS", &max_tunnels)) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, _ ("%s service is lacking key configuration settings (%s). Exiting.\n"), "mesh", "max tunnels"); GNUNET_SCHEDULER_shutdown (); return; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DEFAULT_TTL", &default_ttl)) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("%s service is lacking key configuration settings (%s). Using default (%u).\n"), "mesh", "default ttl", 64); default_ttl = 64; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS", &max_peers)) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _("%s service is lacking key configuration settings (%s). Using default (%u).\n"), "mesh", "max peers", 1000); max_peers = 1000; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT", &drop_percent)) { drop_percent = 0; } else { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Mesh is running with drop mode enabled. " "This is NOT a good idea! " "Remove the DROP_PERCENT option from your configuration.\n"); } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DHT_REPLICATION_LEVEL", &dht_replication_level)) { GNUNET_log (GNUNET_ERROR_TYPE_WARNING, _ ("%s service is lacking key configuration settings (%s). Using default (%u).\n"), "mesh", "dht replication level", 3); dht_replication_level = 3; } tunnels = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_NO); incoming_tunnels = GNUNET_CONTAINER_multihashmap32_create (32); peers = GNUNET_CONTAINER_multipeermap_create (32, GNUNET_NO); ports = GNUNET_CONTAINER_multihashmap32_create (32); dht_handle = GNUNET_DHT_connect (c, 64); if (NULL == dht_handle) { GNUNET_break (0); } stats = GNUNET_STATISTICS_create ("mesh", c); /* Scheduled the task to clean up when shutdown is called */ GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_FOREVER_REL, &shutdown_task, NULL); pk = GNUNET_CRYPTO_ecc_key_create_from_file (keyfile); GNUNET_free (keyfile); GNUNET_assert (NULL != pk); my_private_key = pk; GNUNET_CRYPTO_ecc_key_get_public_for_signature (my_private_key, &my_full_id.public_key); myid = GNUNET_PEER_intern (&my_full_id); GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Mesh for peer [%s] starting\n", GNUNET_i2s(&my_full_id)); core_handle = GNUNET_CORE_connect (c, /* Main configuration */ NULL, /* Closure passed to MESH functions */ &core_init, /* Call core_init once connected */ &core_connect, /* Handle connects */ &core_disconnect, /* remove peers on disconnects */ NULL, /* Don't notify about all incoming messages */ GNUNET_NO, /* For header only in notification */ NULL, /* Don't notify about all outbound messages */ GNUNET_NO, /* For header-only out notification */ core_handlers); /* Register these handlers */ if (NULL == core_handle) { GNUNET_break (0); GNUNET_SCHEDULER_shutdown (); return; } next_tid = 0; next_local_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; announce_id_task = GNUNET_SCHEDULER_add_now (&announce_id, cls); GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Mesh service running\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; int r; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main()\n"); r = GNUNET_SERVICE_run (argc, argv, "mesh", GNUNET_SERVICE_OPTION_NONE, &run, NULL); ret = (GNUNET_OK == r) ? 0 : 1; GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "main() END\n"); INTERVAL_SHOW; return ret; }