/* This file is part of GNUnet. (C) 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. */ #include "platform.h" #include "gnunet_util_lib.h" #include "gnunet_transport_service.h" #include "gnunet_core_service.h" #include "gnunet_statistics_service.h" #include "mesh_protocol.h" #include "gnunet-service-mesh_peer.h" #include "gnunet-service-mesh_dht.h" #include "gnunet-service-mesh_connection.h" #include "gnunet-service-mesh_tunnel.h" #include "mesh_path.h" #define LOG(level, ...) GNUNET_log_from (level,"mesh-p2p",__VA_ARGS__) /******************************************************************************/ /******************************** STRUCTS **********************************/ /******************************************************************************/ /** * 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; /** * Connection this message belongs to. */ struct MeshConnection *c; /** * Is FWD in c? */ int fwd; /** * Pointer to info stucture used as cls. */ void *cls; /** * Type of message */ uint16_t type; /** * Size of the message */ size_t size; /** * Set when this message starts waiting for CORE. */ struct GNUNET_TIME_Absolute start_waiting; /** * Function to call on sending. */ GMP_sent callback; /** * Closure for callback. */ void *callback_cls; }; /** * 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; /** * 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 paths to this peer */ struct GMD_search_handle *search_h; /** * Tunnel to this peer, if any. */ struct MeshTunnel3 *tunnel; /** * Connections that go through this peer, indexed by tid; */ struct GNUNET_CONTAINER_MultiHashMap *connections; /** * Handle for queued transmissions */ struct GNUNET_CORE_TransmitHandle *core_transmit; /** * 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; /** * Hello message. */ struct GNUNET_HELLO_Message* hello; }; /******************************************************************************/ /******************************* GLOBALS ***********************************/ /******************************************************************************/ /** * Global handle to the statistics service. */ extern struct GNUNET_STATISTICS_Handle *stats; /** * Local peer own ID (full value). */ extern struct GNUNET_PeerIdentity my_full_id; /** * Local peer own ID (short) */ extern GNUNET_PEER_Id myid; /** * Peers known, indexed by PeerIdentity (MeshPeer). */ static struct GNUNET_CONTAINER_MultiPeerMap *peers; /** * 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; /** * Handle to communicate with core. */ static struct GNUNET_CORE_Handle *core_handle; /** * Handle to try to start new connections. */ static struct GNUNET_TRANSPORT_Handle *transport_handle; /******************************************************************************/ /***************************** CORE CALLBACKS *********************************/ /******************************************************************************/ /** * Iterator to notify all connections of a broken link. Mark connections * to destroy after all traffic has been sent. * * @param cls Closure (peer disconnected). * @param key Current key code (peer id). * @param value Value in the hash map (connection). * * @return #GNUNET_YES to continue to iterate. */ static int notify_broken (void *cls, const struct GNUNET_HashCode *key, void *value) { struct MeshPeer *peer = cls; struct MeshConnection *c = value; LOG (GNUNET_ERROR_TYPE_DEBUG, " notifying %s due to %s\n", GMC_2s (c), GMP_2s (peer)); GMC_notify_broken (c, peer); return GNUNET_YES; } /** * Remove the direct path to the peer. * * @param peer Peer to remove the direct path from. * */ static struct MeshPeerPath * pop_direct_path (struct MeshPeer *peer) { struct MeshPeerPath *iter; for (iter = peer->path_head; NULL != iter; iter = iter->next) { if (2 <= iter->length) { GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter); return iter; } } return NULL; } /** * 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 *mp; struct MeshPeerPath *path; char own_id[16]; strncpy (own_id, GNUNET_i2s (&my_full_id), 15); mp = GMP_get (peer); if (myid == mp->id) { LOG (GNUNET_ERROR_TYPE_INFO, "CONNECTED %s (self)\n", own_id); path = path_new (1); } else { LOG (GNUNET_ERROR_TYPE_INFO, "CONNECTED %s <= %s\n", own_id, GNUNET_i2s (peer)); path = path_new (2); path->peers[1] = mp->id; GNUNET_PEER_change_rc (mp->id, 1); GNUNET_STATISTICS_update (stats, "# peers", 1, GNUNET_NO); } path->peers[0] = myid; GNUNET_PEER_change_rc (myid, 1); GMP_add_path (mp, path, GNUNET_YES); mp->connections = GNUNET_CONTAINER_multihashmap_create (32, GNUNET_YES); if (NULL != GMP_get_tunnel (mp)) GMP_connect (mp); 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 *p; struct MeshPeerPath *direct_path; char own_id[16]; strncpy (own_id, GNUNET_i2s (&my_full_id), 15); p = GNUNET_CONTAINER_multipeermap_get (peers, peer); if (NULL == p) { GNUNET_break (0); return; } if (myid == p->id) LOG (GNUNET_ERROR_TYPE_INFO, "DISCONNECTED %s (self)\n", own_id); else LOG (GNUNET_ERROR_TYPE_DEBUG, "DISCONNECTED %s <= %s\n", own_id, GNUNET_i2s (peer)); direct_path = pop_direct_path (p); GNUNET_CONTAINER_multihashmap_iterate (p->connections, ¬ify_broken, p); GNUNET_CONTAINER_multihashmap_destroy (p->connections); p->connections = NULL; if (NULL != p->core_transmit) { GNUNET_CORE_notify_transmit_ready_cancel (p->core_transmit); p->core_transmit = NULL; } GNUNET_STATISTICS_update (stats, "# peers", -1, GNUNET_NO); path_destroy (direct_path); return; } /** * Functions to handle messages from core */ static struct GNUNET_CORE_MessageHandler core_handlers[] = { {&GMC_handle_create, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE, 0}, {&GMC_handle_confirm, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK, sizeof (struct GNUNET_MESH_ConnectionACK)}, {&GMC_handle_broken, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN, sizeof (struct GNUNET_MESH_ConnectionBroken)}, {&GMC_handle_destroy, GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY, sizeof (struct GNUNET_MESH_ConnectionDestroy)}, {&GMC_handle_ack, GNUNET_MESSAGE_TYPE_MESH_ACK, sizeof (struct GNUNET_MESH_ACK)}, {&GMC_handle_poll, GNUNET_MESSAGE_TYPE_MESH_POLL, sizeof (struct GNUNET_MESH_Poll)}, {&GMC_handle_encrypted, GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED, 0}, {&GMC_handle_kx, GNUNET_MESSAGE_TYPE_MESH_KX, 0}, {NULL, 0, 0} }; /** * 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; LOG (GNUNET_ERROR_TYPE_DEBUG, "Core init\n"); if (0 != memcmp (identity, &my_full_id, sizeof (my_full_id))) { LOG (GNUNET_ERROR_TYPE_ERROR, _("Wrong CORE service\n")); LOG (GNUNET_ERROR_TYPE_ERROR, " core id %s\n", GNUNET_i2s (identity)); 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(); } GML_start (); return; } /** * 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 connection message to a peer. * * @param c Connection to create. * @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_connection_create (struct MeshConnection *c, size_t size, void *buf) { struct GNUNET_MESH_ConnectionCreate *msg; struct GNUNET_PeerIdentity *peer_ptr; const struct MeshPeerPath *p = GMC_get_path (c); size_t size_needed; int i; if (NULL == p) return 0; LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION CREATE...\n"); size_needed = sizeof (struct GNUNET_MESH_ConnectionCreate) + p->length * sizeof (struct GNUNET_PeerIdentity); if (size < size_needed || NULL == buf) { GNUNET_break (0); return 0; } msg = (struct GNUNET_MESH_ConnectionCreate *) buf; msg->header.size = htons (size_needed); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE); msg->cid = *GMC_get_id (c); peer_ptr = (struct GNUNET_PeerIdentity *) &msg[1]; for (i = 0; i < p->length; i++) { GNUNET_PEER_resolve (p->peers[i], peer_ptr++); } LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION CREATE (%u bytes long) sent!\n", size_needed); return size_needed; } /** * Creates a path ack message in buf and frees all unused resources. * * @param c Connection to send an ACK on. * @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_connection_ack (struct MeshConnection *c, size_t size, void *buf) { struct GNUNET_MESH_ConnectionACK *msg = buf; LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending CONNECTION ACK...\n"); if (sizeof (struct GNUNET_MESH_ConnectionACK) > size) { GNUNET_break (0); return 0; } msg->header.size = htons (sizeof (struct GNUNET_MESH_ConnectionACK)); msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK); msg->cid = *GMC_get_id (c); LOG (GNUNET_ERROR_TYPE_DEBUG, "CONNECTION ACK sent!\n"); return sizeof (struct GNUNET_MESH_ConnectionACK); } /******************************************************************************/ /******************************** STATIC ***********************************/ /******************************************************************************/ /** * Get priority for a queued message. * * @param q Queued message * * @return CORE priority to use. */ static enum GNUNET_CORE_Priority get_priority (struct MeshPeerQueue *q) { enum GNUNET_CORE_Priority low; enum GNUNET_CORE_Priority high; if (NULL == q) { GNUNET_break (0); return GNUNET_CORE_PRIO_BACKGROUND; } /* Relayed traffic has lower priority, our own traffic has higher */ if (NULL == q->c || GNUNET_NO == GMC_is_origin (q->c, q->fwd)) { low = GNUNET_CORE_PRIO_BEST_EFFORT; high = GNUNET_CORE_PRIO_URGENT; } else { low = GNUNET_CORE_PRIO_URGENT; high = GNUNET_CORE_PRIO_CRITICAL_CONTROL; } /* Bulky payload has lower priority, control traffic has higher. */ if (GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED == q->type) return low; else return high; } /** * 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_PeerIdentity *key, void *value) { struct MeshPeer *p = value; struct MeshTunnel3 *t = p->tunnel; if (NULL != t) GMT_destroy (t); return GNUNET_YES; } /** * 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; GNUNET_PEER_resolve (peer->id, &id); GNUNET_PEER_change_rc (peer->id, -1); LOG (GNUNET_ERROR_TYPE_WARNING, "destroying peer %s\n", GNUNET_i2s (&id)); if (GNUNET_YES != GNUNET_CONTAINER_multipeermap_remove (peers, &id, peer)) { GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_WARNING, " not in peermap!!\n"); } if (NULL != peer->search_h) { GMD_search_stop (peer->search_h); } 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; } GMT_destroy_empty (peer->tunnel); GNUNET_free (peer); return GNUNET_OK; } /** * Returns if peer is used (has a tunnel or is neighbor). * * @param peer Peer to check. * * @return #GNUNET_YES if peer is in use. */ static int peer_is_used (struct MeshPeer *peer) { struct MeshPeerPath *p; if (NULL != peer->tunnel) return GNUNET_YES; for (p = peer->path_head; NULL != p; p = p->next) { if (p->length < 3) return GNUNET_YES; } return GNUNET_NO; } /** * Iterator over all the peers to get the oldest timestamp. * * @param cls Closure (unsued). * @param key ID of the peer. * @param value Peer_Info of the peer. */ static int peer_get_oldest (void *cls, const struct GNUNET_PeerIdentity *key, void *value) { struct MeshPeer *p = value; struct GNUNET_TIME_Absolute *abs = cls; /* Don't count active peers */ if (GNUNET_YES == peer_is_used (p)) return GNUNET_YES; if (abs->abs_value_us < p->last_contact.abs_value_us) abs->abs_value_us = p->last_contact.abs_value_us; return GNUNET_YES; } /** * Iterator over all the peers to remove the oldest entry. * * @param cls Closure (unsued). * @param key ID of the peer. * @param value Peer_Info of the peer. */ static int peer_timeout (void *cls, const struct GNUNET_PeerIdentity *key, void *value) { struct MeshPeer *p = value; struct GNUNET_TIME_Absolute *abs = cls; LOG (GNUNET_ERROR_TYPE_WARNING, "peer %s timeout\n", GNUNET_i2s (key)); if (p->last_contact.abs_value_us == abs->abs_value_us && GNUNET_NO == peer_is_used (p)) { peer_destroy (p); return GNUNET_NO; } return GNUNET_YES; } /** * Delete oldest unused peer. */ static void peer_delete_oldest (void) { struct GNUNET_TIME_Absolute abs; abs = GNUNET_TIME_UNIT_FOREVER_ABS; GNUNET_CONTAINER_multipeermap_iterate (peers, &peer_get_oldest, &abs); GNUNET_CONTAINER_multipeermap_iterate (peers, &peer_timeout, &abs); } /** * Choose the best (yet unused) path towards a peer, * considering the tunnel properties. * * @param peer The destination peer. * * @return Best current known path towards the peer, if any. */ static struct MeshPeerPath * peer_get_best_path (const struct MeshPeer *peer) { struct MeshPeerPath *best_p; struct MeshPeerPath *p; unsigned int best_cost; unsigned int cost; best_cost = UINT_MAX; best_p = NULL; for (p = peer->path_head; NULL != p; p = p->next) { if (GNUNET_YES == GMT_is_path_used (peer->tunnel, p)) continue; /* If path is already in use, skip it. */ if (GNUNET_NO == path_is_valid (p)) continue; /* Don't use invalid paths. */ if ((cost = GMT_get_path_cost (peer->tunnel, p)) < best_cost) { best_cost = cost; best_p = p; } } return best_p; } static int queue_is_sendable (struct MeshPeerQueue *q) { /* Is PID-independent? */ switch (q->type) { case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: case GNUNET_MESSAGE_TYPE_MESH_KX: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN: return GNUNET_YES; case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED: break; default: GNUNET_break (0); } return GMC_is_sendable (q->c, q->fwd); } /** * Get first sendable message. * * @param peer The destination peer. * * @return First transmittable message, if any. Otherwise, NULL. */ static struct MeshPeerQueue * peer_get_first_message (const struct MeshPeer *peer) { struct MeshPeerQueue *q; for (q = peer->queue_head; NULL != q; q = q->next) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Checking %p towards %s\n", q, GMC_2s (q->c)); if (queue_is_sendable (q)) return q; } return NULL; } /** * 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 path */ static void search_handler (void *cls, const struct MeshPeerPath *path) { struct MeshPeer *peer = cls; unsigned int connection_count; GMP_add_path_to_all (path, GNUNET_NO); /* Count connections */ connection_count = GMT_count_connections (peer->tunnel); /* If we already have 3 (or more (?!)) connections, it's enough */ if (3 <= connection_count) return; if (MESH_TUNNEL3_SEARCHING == GMT_get_cstate (peer->tunnel)) { LOG (GNUNET_ERROR_TYPE_DEBUG, " ... connect!\n"); GMP_connect (peer); } return; } /** * 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) { struct MeshPeer *peer = cls; struct MeshConnection *c; struct MeshPeerQueue *queue; const struct GNUNET_PeerIdentity *dst_id; size_t data_size; peer->core_transmit = NULL; LOG (GNUNET_ERROR_TYPE_DEBUG, "* Queue send towards %s (max %u)\n", GMP_2s (peer), size); if (NULL == buf || 0 == size) { LOG (GNUNET_ERROR_TYPE_DEBUG, "* Buffer size 0.\n"); return 0; } /* Initialize */ queue = peer_get_first_message (peer); if (NULL == queue) { GNUNET_assert (0); /* Core tmt_rdy should've been canceled */ return 0; } c = queue->c; dst_id = GNUNET_PEER_resolve2 (peer->id); LOG (GNUNET_ERROR_TYPE_DEBUG, "* on connection %s\n", GMC_2s (c)); /* Check if buffer size is enough for the message */ if (queue->size > size) { LOG (GNUNET_ERROR_TYPE_WARNING, "not enough room (%u vs %u), reissue\n", queue->size, size); peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, get_priority (queue), GNUNET_TIME_UNIT_FOREVER_REL, dst_id, queue->size, &queue_send, peer); return 0; } LOG (GNUNET_ERROR_TYPE_DEBUG, "* size %u ok\n", queue->size); /* Fill buf */ switch (queue->type) { case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN: case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED: case GNUNET_MESSAGE_TYPE_MESH_KX: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: LOG (GNUNET_ERROR_TYPE_DEBUG, "* raw: %s\n", GM_m2s (queue->type)); data_size = send_core_data_raw (queue->cls, size, buf); break; case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE: LOG (GNUNET_ERROR_TYPE_DEBUG, "* path create\n"); if (GMC_is_origin (c, GNUNET_YES)) data_size = send_core_connection_create (queue->c, size, buf); else data_size = send_core_data_raw (queue->cls, size, buf); break; case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: LOG (GNUNET_ERROR_TYPE_DEBUG, "* path ack\n"); if (GMC_is_origin (c, GNUNET_NO) || GMC_is_origin (c, GNUNET_YES)) data_size = send_core_connection_ack (queue->c, size, buf); else data_size = send_core_data_raw (queue->cls, size, buf); break; case GNUNET_MESSAGE_TYPE_MESH_DATA: case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE: case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: /* This should be encapsulted */ GNUNET_break (0); data_size = 0; break; default: GNUNET_break (0); 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) { LOG (GNUNET_ERROR_TYPE_WARNING, "DD %s on connection\n", GM_m2s (queue->type), GMC_2s (c)); data_size = 0; } else { LOG (GNUNET_ERROR_TYPE_INFO, "ss %s on connection %s (%p) %s (size %u)\n", GM_m2s (queue->type), GMC_2s (c), c, GM_f2s (queue->fwd), data_size); } /* Free queue, but cls was freed by send_core_* */ GMP_queue_destroy (queue, GNUNET_NO, GNUNET_YES); /* If more data in queue, send next */ queue = peer_get_first_message (peer); if (NULL != queue) { LOG (GNUNET_ERROR_TYPE_DEBUG, "* more data!\n"); if (NULL == peer->core_transmit) { peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, get_priority (queue), GNUNET_TIME_UNIT_FOREVER_REL, dst_id, queue->size, &queue_send, peer); queue->start_waiting = GNUNET_TIME_absolute_get (); } else { LOG (GNUNET_ERROR_TYPE_DEBUG, "* tmt rdy called somewhere else\n"); } // GMC_start_poll (); FIXME needed? } else { // GMC_stop_poll(); FIXME needed? } LOG (GNUNET_ERROR_TYPE_DEBUG, "* Return %d\n", data_size); return data_size; } /******************************************************************************/ /******************************** API ***********************************/ /******************************************************************************/ /** * 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? * @param sent Was it really sent? (Could have been canceled) */ void GMP_queue_destroy (struct MeshPeerQueue *queue, int clear_cls, int sent) { struct MeshPeer *peer; peer = queue->peer; if (GNUNET_YES == clear_cls) { LOG (GNUNET_ERROR_TYPE_DEBUG, "queue destroy type %s\n", GM_m2s (queue->type)); switch (queue->type) { case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: LOG (GNUNET_ERROR_TYPE_INFO, "destroying a DESTROY message\n"); /* fall through */ case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN: case GNUNET_MESSAGE_TYPE_MESH_KEEPALIVE: case GNUNET_MESSAGE_TYPE_MESH_KX: case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: GNUNET_free_non_null (queue->cls); break; default: GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_ERROR, " type %s unknown!\n", GM_m2s (queue->type)); } } GNUNET_CONTAINER_DLL_remove (peer->queue_head, peer->queue_tail, queue); if (queue->type != GNUNET_MESSAGE_TYPE_MESH_ACK && queue->type != GNUNET_MESSAGE_TYPE_MESH_POLL) { peer->queue_n--; } if (NULL != queue->callback) { LOG (GNUNET_ERROR_TYPE_DEBUG, " calling callback\n"); queue->callback (queue->callback_cls, queue->c, sent, queue->type, queue->fwd, queue->size, GNUNET_TIME_absolute_get_duration (queue->start_waiting)); } if (NULL == peer_get_first_message (peer) && NULL != peer->core_transmit) { GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit); peer->core_transmit = NULL; } GNUNET_free (queue); } /** * @brief Queue and pass message to core when possible. * * @param peer Peer towards which to queue the message. * @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 c Connection this message belongs to (can be NULL). * @param fwd Is this a message going root->dest? (FWD ACK are NOT FWD!) * @param cont Continuation to be called once CORE has taken the message. * @param cont_cls Closure for @c cont. * * @return Handle to cancel the message before it is sent. Once cont is called * message has been sent and therefore the handle is no longer valid. */ struct MeshPeerQueue * GMP_queue_add (struct MeshPeer *peer, void *cls, uint16_t type, size_t size, struct MeshConnection *c, int fwd, GMP_sent cont, void *cont_cls) { struct MeshPeerQueue *queue; int priority; int call_core; LOG (GNUNET_ERROR_TYPE_INFO, "qq %s on connection %s (%p) %s towards %s (size %u)\n", GM_m2s (type), GMC_2s (c), c, GM_f2s (fwd), GMP_2s(peer), size); if (NULL == peer->connections) { /* We are not connected to this peer, ignore request. */ LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING %s not a neighbor\n", GMP_2s (peer)); GNUNET_STATISTICS_update (stats, "# messages dropped due to wrong hop", 1, GNUNET_NO); return NULL; } priority = 0; if (GNUNET_MESSAGE_TYPE_MESH_POLL == type || GNUNET_MESSAGE_TYPE_MESH_ACK == type) { priority = 100; } LOG (GNUNET_ERROR_TYPE_DEBUG, "priority %d\n", priority); call_core = NULL == c ? GNUNET_YES : GMC_is_sendable (c, fwd); queue = GNUNET_new (struct MeshPeerQueue); queue->cls = cls; queue->type = type; queue->size = size; queue->peer = peer; queue->c = c; queue->fwd = fwd; queue->callback = cont; queue->callback_cls = cont_cls; if (100 > priority) { GNUNET_CONTAINER_DLL_insert_tail (peer->queue_head, peer->queue_tail, queue); peer->queue_n++; } else { GNUNET_CONTAINER_DLL_insert (peer->queue_head, peer->queue_tail, queue); call_core = GNUNET_YES; } if (NULL == peer->core_transmit && GNUNET_YES == call_core) { LOG (GNUNET_ERROR_TYPE_DEBUG, "calling core tmt rdy towards %s for %u bytes\n", GMP_2s (peer), size); peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, get_priority (queue), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_PEER_resolve2 (peer->id), size, &queue_send, peer); queue->start_waiting = GNUNET_TIME_absolute_get (); } else if (GNUNET_NO == call_core) { LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s not needed\n", GMP_2s (peer)); } else { LOG (GNUNET_ERROR_TYPE_DEBUG, "core tmt rdy towards %s already called\n", GMP_2s (peer)); } return queue; } /** * Cancel all queued messages to a peer that belong to a certain connection. * * @param peer Peer towards whom to cancel. * @param c Connection whose queued messages to cancel. Might be destroyed by * the sent continuation call. */ void GMP_queue_cancel (struct MeshPeer *peer, struct MeshConnection *c) { struct MeshPeerQueue *q; struct MeshPeerQueue *next; struct MeshPeerQueue *prev; for (q = peer->queue_head; NULL != q; q = next) { prev = q->prev; if (q->c == c) { LOG (GNUNET_ERROR_TYPE_DEBUG, "GMP_cancel_queue %s\n", GM_m2s (q->type)); GMP_queue_destroy (q, GNUNET_YES, GNUNET_NO); /* Get next from prev, q->next might be already freed: * queue destroy -> callback -> GMC_destroy -> cancel_queues -> here */ if (NULL == prev) next = peer->queue_head; else next = prev->next; } else { next = q->next; } } if (NULL == peer->queue_head) { if (NULL != peer->core_transmit) { GNUNET_CORE_notify_transmit_ready_cancel (peer->core_transmit); peer->core_transmit = NULL; } } } /** * Get the first transmittable message for a connection. * * @param peer Neighboring peer. * @param c Connection. * * @return First transmittable message. */ static struct MeshPeerQueue * connection_get_first_message (struct MeshPeer *peer, struct MeshConnection *c) { struct MeshPeerQueue *q; for (q = peer->queue_head; NULL != q; q = q->next) { if (q->c != c) continue; if (queue_is_sendable (q)) { LOG (GNUNET_ERROR_TYPE_DEBUG, " sendable!!\n"); return q; } LOG (GNUNET_ERROR_TYPE_DEBUG, " not sendable\n"); } return NULL; } /** * Get the first message for a connection and unqueue it. * * @param peer Neighboring peer. * @param c Connection. * * @return First message for this connection. */ struct GNUNET_MessageHeader * GMP_connection_pop (struct MeshPeer *peer, struct MeshConnection *c) { struct MeshPeerQueue *q; struct MeshPeerQueue *next; struct GNUNET_MessageHeader *msg; LOG (GNUNET_ERROR_TYPE_DEBUG, "Connection pop on %s\n", GMC_2s (c)); for (q = peer->queue_head; NULL != q; q = next) { next = q->next; if (q->c != c) continue; switch (q->type) { case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_CREATE: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_ACK: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_CONNECTION_BROKEN: case GNUNET_MESSAGE_TYPE_MESH_ACK: case GNUNET_MESSAGE_TYPE_MESH_POLL: GMP_queue_destroy (q, GNUNET_YES, GNUNET_NO); continue; case GNUNET_MESSAGE_TYPE_MESH_KX: case GNUNET_MESSAGE_TYPE_MESH_ENCRYPTED: msg = (struct GNUNET_MessageHeader *) q->cls; GMP_queue_destroy (q, GNUNET_NO, GNUNET_NO); return msg; default: GNUNET_break (0); } } return NULL; } void GMP_queue_unlock (struct MeshPeer *peer, struct MeshConnection *c) { struct MeshPeerQueue *q; size_t size; if (NULL != peer->core_transmit) { LOG (GNUNET_ERROR_TYPE_DEBUG, " already unlocked!\n"); return; /* Already unlocked */ } q = connection_get_first_message (peer, c); if (NULL == q) { LOG (GNUNET_ERROR_TYPE_DEBUG, " queue empty!\n"); return; /* Nothing to transmit */ } size = q->size; peer->core_transmit = GNUNET_CORE_notify_transmit_ready (core_handle, GNUNET_NO, get_priority (q), GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_PEER_resolve2 (peer->id), size, &queue_send, peer); } /** * Initialize the peer subsystem. * * @param c Configuration. */ void GMP_init (const struct GNUNET_CONFIGURATION_Handle *c) { LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n"); peers = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_NO); if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "MAX_PEERS", &max_peers)) { GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING, "MESH", "MAX_PEERS", "USING DEFAULT"); max_peers = 1000; } if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_number (c, "MESH", "DROP_PERCENT", &drop_percent)) { drop_percent = 0; } else { LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "Mesh is running with DROP enabled.\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "This is NOT a good idea!\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "Remove DROP_PERCENT from config file.\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n"); } 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 (GNUNET_YES != GNUNET_CONFIGURATION_get_value_yesno (c, "MESH", "DISABLE_TRY_CONNECT")) { transport_handle = GNUNET_TRANSPORT_connect (c, &my_full_id, NULL, /* cls */ /* Notify callbacks */ NULL, NULL, NULL); } else { LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "* DISABLE TRYING CONNECT in config *\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "* Use this only for test purposes. *\n"); LOG (GNUNET_ERROR_TYPE_WARNING, "**************************************\n"); } if (NULL == core_handle) { GNUNET_break (0); GNUNET_SCHEDULER_shutdown (); return; } } /** * Shut down the peer subsystem. */ void GMP_shutdown (void) { GNUNET_CONTAINER_multipeermap_iterate (peers, &shutdown_tunnel, NULL); if (core_handle != NULL) { GNUNET_CORE_disconnect (core_handle); core_handle = NULL; } if (transport_handle != NULL) { GNUNET_TRANSPORT_disconnect (transport_handle); transport_handle = NULL; } GNUNET_PEER_change_rc (myid, -1); } /** * 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_id Full identity of the peer. * * @return Existing or newly created peer structure. */ struct MeshPeer * GMP_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) { peer_delete_oldest (); } 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 structure. */ struct MeshPeer * GMP_get_short (const GNUNET_PEER_Id peer) { return GMP_get (GNUNET_PEER_resolve2 (peer)); } /** * Try to connect to a peer on transport level. * * @param cls Closure (peer). * @param tc TaskContext. */ static void try_connect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct MeshPeer *peer = cls; if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason)) return; GNUNET_TRANSPORT_try_connect (transport_handle, GNUNET_PEER_resolve2 (peer->id), NULL, NULL); } /** * Try to establish a new connection to this peer (in its 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 CONNECTION towards it. * * @param peer Peer to connect to. */ void GMP_connect (struct MeshPeer *peer) { struct MeshTunnel3 *t; struct MeshPeerPath *p; struct MeshConnection *c; int rerun_search; LOG (GNUNET_ERROR_TYPE_DEBUG, "peer_connect towards %s\n", GMP_2s (peer)); /* If we have a current hello, try to connect using it. */ GMP_try_connect (peer); t = peer->tunnel; c = NULL; rerun_search = GNUNET_NO; if (NULL != peer->path_head) { LOG (GNUNET_ERROR_TYPE_DEBUG, " some path exists\n"); p = peer_get_best_path (peer); if (NULL != p) { char *s; s = path_2s (p); LOG (GNUNET_ERROR_TYPE_DEBUG, " path to use: %s\n", s); GNUNET_free (s); c = GMT_use_path (t, p); if (NULL == c) { /* This case can happen when the path includes a first hop that is * not yet known to be connected. * * This happens quite often during testing when running mesh * under valgrind: core connect notifications come very late and the * DHT result has already come and created a valid path. * In this case, the peer->connections hashmap will be NULL and * tunnel_use_path will not be able to create a connection from that * path. * * Re-running the DHT GET should give core time to callback. * * GMT_use_path -> GMC_new -> register_neighbors takes care of * updating statistics about this issue. */ rerun_search = GNUNET_YES; } else { GMC_send_create (c); return; } } else { LOG (GNUNET_ERROR_TYPE_DEBUG, " but is NULL, all paths are in use\n"); } } if (NULL != peer->search_h && GNUNET_YES == rerun_search) { GMD_search_stop (peer->search_h); peer->search_h = NULL; LOG (GNUNET_ERROR_TYPE_DEBUG, " Stopping DHT GET for peer %s\n", GMP_2s (peer)); } if (NULL == peer->search_h) { const struct GNUNET_PeerIdentity *id; id = GNUNET_PEER_resolve2 (peer->id); LOG (GNUNET_ERROR_TYPE_DEBUG, " Starting DHT GET for peer %s\n", GMP_2s (peer)); peer->search_h = GMD_search (id, &search_handler, peer); if (MESH_TUNNEL3_NEW == GMT_get_cstate (t)) GMT_change_cstate (t, MESH_TUNNEL3_SEARCHING); } } /** * Chech whether there is a direct (core level) connection to peer. * * @param peer Peer to check. * * @return #GNUNET_YES if there is a direct connection. */ int GMP_is_neighbor (const struct MeshPeer *peer) { struct MeshPeerPath *path; if (NULL == peer->connections) return GNUNET_NO; for (path = peer->path_head; NULL != path; path = path->next) { if (3 > path->length) return GNUNET_YES; } /* Is not a neighbor but connections is not NULL, probably disconnecting */ return GNUNET_NO; } /** * Create and initialize a new tunnel towards a peer, in case it has none. * In case the peer already has a tunnel, nothing is done. * * Does not generate any traffic, just creates the local data structures. * * @param peer Peer towards which to create the tunnel. */ void GMP_add_tunnel (struct MeshPeer *peer) { if (NULL != peer->tunnel) return; peer->tunnel = GMT_new (peer); } /** * Add a connection to a neighboring peer. * * Store that the peer is the first hop of the connection in one * direction and that on peer disconnect the connection must be * notified and destroyed, for it will no longer be valid. * * @param peer Peer to add connection to. * @param c Connection to add. * * @return GNUNET_OK on success. */ int GMP_add_connection (struct MeshPeer *peer, struct MeshConnection *c) { int result; LOG (GNUNET_ERROR_TYPE_DEBUG, "adding connection %s\n", GMC_2s (c)); LOG (GNUNET_ERROR_TYPE_DEBUG, "to peer %s\n", GMP_2s (peer)); if (NULL == peer->connections) { GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_DEBUG, "Peer %s is not a neighbor!\n", GMP_2s (peer)); return GNUNET_SYSERR; } LOG (GNUNET_ERROR_TYPE_DEBUG, "peer %s ok, has %u connections.\n", GMP_2s (peer), GNUNET_CONTAINER_multihashmap_size (peer->connections)); result = GNUNET_CONTAINER_multihashmap_put (peer->connections, GMC_get_h (c), c, GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST); LOG (GNUNET_ERROR_TYPE_DEBUG, " now has %u connections.\n", GNUNET_CONTAINER_multihashmap_size (peer->connections)); LOG (GNUNET_ERROR_TYPE_DEBUG, "result %u\n", result); return result; } /** * Add the path to the peer and update the path used to reach it in case this * is the shortest. * * @param peer 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? * * @return path if path was taken, pointer to existing duplicate if exists * NULL on error. */ struct MeshPeerPath * GMP_add_path (struct MeshPeer *peer, struct MeshPeerPath *path, int trusted) { struct MeshPeerPath *aux; unsigned int l; unsigned int l2; LOG (GNUNET_ERROR_TYPE_DEBUG, "adding path [%u] to peer %s\n", path->length, GMP_2s (peer)); if ((NULL == peer) || (NULL == path)) { GNUNET_break (0); path_destroy (path); return NULL; } if (path->peers[path->length - 1] != peer->id) { GNUNET_break (0); path_destroy (path); return NULL; } for (l = 1; l < path->length; l++) { if (path->peers[l] == myid) { 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)); } } LOG (GNUNET_ERROR_TYPE_DEBUG, " final length: %u\n", path->length); if (2 >= path->length && GNUNET_NO == trusted) { /* Only allow CORE to tell us about direct paths */ path_destroy (path); return NULL; } l = path_get_length (path); if (0 == l) { path_destroy (path); return NULL; } GNUNET_assert (peer->id == path->peers[path->length - 1]); for (aux = peer->path_head; aux != NULL; aux = aux->next) { l2 = path_get_length (aux); if (l2 > l) { LOG (GNUNET_ERROR_TYPE_DEBUG, " added\n"); GNUNET_CONTAINER_DLL_insert_before (peer->path_head, peer->path_tail, aux, path); if (NULL != peer->tunnel && 3 < GMT_count_connections (peer->tunnel)) { GMP_connect (peer); } return path; } else { if (l2 == l && memcmp (path->peers, aux->peers, l) == 0) { LOG (GNUNET_ERROR_TYPE_DEBUG, " already known\n"); path_destroy (path); return aux; } } } GNUNET_CONTAINER_DLL_insert_tail (peer->path_head, peer->path_tail, path); LOG (GNUNET_ERROR_TYPE_DEBUG, " added last\n"); if (NULL != peer->tunnel && 3 < GMT_count_connections (peer->tunnel)) { GMP_connect (peer); } return path; } /** * 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 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? * * @return path if path was taken, pointer to existing duplicate if exists * NULL on error. */ struct MeshPeerPath * GMP_add_path_to_origin (struct MeshPeer *peer, struct MeshPeerPath *path, int trusted) { if (NULL == path) return NULL; path_invert (path); return GMP_add_path (peer, path, trusted); } /** * Adds a path to the info of all the peers in the path * * @param p Path to process. * @param confirmed Whether we know if the path works or not. */ void GMP_add_path_to_all (const 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 = GMP_get_short (p->peers[i]); copy = path_duplicate (p); copy->length = i + 1; GMP_add_path (aux, copy, p->length < 3 ? GNUNET_NO : confirmed); } } /** * Remove any path to the peer that has the extact same peers as the one given. * * @param peer Peer to remove the path from. * @param path Path to remove. Is always destroyed . */ void GMP_remove_path (struct MeshPeer *peer, struct MeshPeerPath *path) { struct MeshPeerPath *iter; struct MeshPeerPath *next; GNUNET_assert (myid == path->peers[0]); GNUNET_assert (peer->id == path->peers[path->length - 1]); for (iter = peer->path_head; NULL != iter; iter = next) { next = iter->next; if (0 == memcmp (path->peers, iter->peers, sizeof (GNUNET_PEER_Id) * path->length)) { GNUNET_CONTAINER_DLL_remove (peer->path_head, peer->path_tail, iter); if (iter != path) path_destroy (iter); } } path_destroy (path); } /** * Remove a connection from a neighboring peer. * * @param peer Peer to remove connection from. * @param c Connection to remove. * * @return GNUNET_OK on success. */ int GMP_remove_connection (struct MeshPeer *peer, const struct MeshConnection *c) { LOG (GNUNET_ERROR_TYPE_DEBUG, "removing connection %s\n", GMC_2s (c)); LOG (GNUNET_ERROR_TYPE_DEBUG, "from peer %s\n", GMP_2s (peer)); if (NULL == peer || NULL == peer->connections) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Peer %s is not a neighbor!\n", GMP_2s (peer)); return GNUNET_SYSERR; } LOG (GNUNET_ERROR_TYPE_DEBUG, "peer %s ok, has %u connections.\n", GMP_2s (peer), GNUNET_CONTAINER_multihashmap_size (peer->connections)); return GNUNET_CONTAINER_multihashmap_remove (peer->connections, GMC_get_h (c), c); } /** * Start the DHT search for new paths towards the peer: we don't have * enough good connections. * * @param peer Destination peer. */ void GMP_start_search (struct MeshPeer *peer) { if (NULL != peer->search_h) { GNUNET_break (0); return; } peer->search_h = GMD_search (GMP_get_id (peer), &search_handler, peer); } /** * Stop the DHT search for new paths towards the peer: we already have * enough good connections. * * @param peer Destination peer. */ void GMP_stop_search (struct MeshPeer *peer) { if (NULL == peer->search_h) { return; } GMD_search_stop (peer->search_h); peer->search_h = NULL; } /** * Get the Full ID of a peer. * * @param peer Peer to get from. * * @return Full ID of peer. */ const struct GNUNET_PeerIdentity * GMP_get_id (const struct MeshPeer *peer) { return GNUNET_PEER_resolve2 (peer->id); } /** * Get the Short ID of a peer. * * @param peer Peer to get from. * * @return Short ID of peer. */ GNUNET_PEER_Id GMP_get_short_id (const struct MeshPeer *peer) { return peer->id; } /** * Set tunnel. * * @param peer Peer. * @param t Tunnel. */ void GMP_set_tunnel (struct MeshPeer *peer, struct MeshTunnel3 *t) { peer->tunnel = t; if (NULL == t && NULL != peer->search_h) { GMP_stop_search (peer); } } /** * Get the tunnel towards a peer. * * @param peer Peer to get from. * * @return Tunnel towards peer. */ struct MeshTunnel3 * GMP_get_tunnel (const struct MeshPeer *peer) { return peer->tunnel; } /** * Set the hello message. * * @param peer Peer whose message to set. * @param hello Hello message. */ void GMP_set_hello (struct MeshPeer *peer, const struct GNUNET_HELLO_Message *hello) { struct GNUNET_HELLO_Message *old; size_t size; LOG (GNUNET_ERROR_TYPE_DEBUG, "set hello for %s\n", GMP_2s (peer)); if (NULL == hello) return; old = GMP_get_hello (peer); if (NULL == old) { size = GNUNET_HELLO_size (hello); LOG (GNUNET_ERROR_TYPE_DEBUG, " new (%u bytes)\n", size); peer->hello = GNUNET_malloc (size); memcpy (peer->hello, hello, size); } else { peer->hello = GNUNET_HELLO_merge (old, hello); LOG (GNUNET_ERROR_TYPE_DEBUG, " merge into %p (%u bytes)\n", peer->hello, GNUNET_HELLO_size (hello)); GNUNET_free (old); } } /** * Get the hello message. * * @param peer Peer whose message to get. * * @return Hello message. */ struct GNUNET_HELLO_Message * GMP_get_hello (struct MeshPeer *peer) { struct GNUNET_TIME_Absolute expiration; struct GNUNET_TIME_Relative remaining; if (NULL == peer->hello) return NULL; expiration = GNUNET_HELLO_get_last_expiration (peer->hello); remaining = GNUNET_TIME_absolute_get_remaining (expiration); if (0 == remaining.rel_value_us) { LOG (GNUNET_ERROR_TYPE_DEBUG, " get - hello expired on %s\n", GNUNET_STRINGS_absolute_time_to_string (expiration)); GNUNET_free (peer->hello); peer->hello = NULL; } return peer->hello; } /** * Try to connect to a peer on TRANSPORT level. * * @param peer Peer to whom to connect. */ void GMP_try_connect (struct MeshPeer *peer) { struct GNUNET_HELLO_Message *hello; struct GNUNET_MessageHeader *mh; if (NULL == transport_handle) return; hello = GMP_get_hello (peer); if (NULL == hello) return; mh = GNUNET_HELLO_get_header (hello); GNUNET_TRANSPORT_offer_hello (transport_handle, mh, try_connect, peer); } /** * Notify a peer that a link between two other peers is broken. If any path * used that link, eliminate it. * * @param peer Peer affected by the change. * @param peer1 Peer whose link is broken. * @param peer2 Peer whose link is broken. */ void GMP_notify_broken_link (struct MeshPeer *peer, struct GNUNET_PeerIdentity *peer1, struct GNUNET_PeerIdentity *peer2) { struct MeshPeerPath *iter; struct MeshPeerPath *next; unsigned int i; GNUNET_PEER_Id p1; GNUNET_PEER_Id p2; p1 = GNUNET_PEER_search (peer1); p2 = GNUNET_PEER_search (peer2); LOG (GNUNET_ERROR_TYPE_DEBUG, "Link %u-%u broken\n", p1, p2); if (0 == p1 || 0 == p2) { /* We don't even know them */ return; } for (iter = peer->path_head; NULL != iter; iter = next) { next = iter->next; for (i = 0; i < iter->length - 1; i++) { if ((iter->peers[i] == p1 && iter->peers[i + 1] == p2) || (iter->peers[i] == p2 && iter->peers[i + 1] == p1)) { char *s; s = path_2s (iter); LOG (GNUNET_ERROR_TYPE_DEBUG, " - invalidating %s\n", s); GNUNET_free (s); path_invalidate (iter); } } } } /** * Count the number of known paths toward the peer. * * @param peer Peer to get path info. * * @return Number of known paths. */ unsigned int GMP_count_paths (const struct MeshPeer *peer) { struct MeshPeerPath *iter; unsigned int i; for (iter = peer->path_head, i = 0; NULL != iter; iter = iter->next) i++; return i; } /** * Iterate all known peers. * * @param iter Iterator. * @param cls Closure for @c iter. */ void GMP_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls) { GNUNET_CONTAINER_multipeermap_iterate (peers, iter, cls); } /** * Get the static string for a peer ID. * * @param peer Peer. * * @return Static string for it's ID. */ const char * GMP_2s (const struct MeshPeer *peer) { if (NULL == peer) return "(NULL)"; return GNUNET_i2s (GNUNET_PEER_resolve2 (peer->id)); }