/* This file is part of GNUnet. (C) 2011 Christian Grothoff (and other contributing authors) GNUnet is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GNUnet is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNUnet; see the file COPYING. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /** * @file mesh/mesh_api.c * @brief mesh api: client implementation of mesh service * @author Bartlomiej Polot * * STRUCTURE: * - DATA STRUCTURES * - DECLARATIONS * - AUXILIARY FUNCTIONS * - RECEIVE HANDLERS * - SEND FUNCTIONS * - API CALL DEFINITIONS * * TODO: add regex to reconnect */ #include "platform.h" #include "gnunet_common.h" #include "gnunet_client_lib.h" #include "gnunet_util_lib.h" #include "gnunet_peer_lib.h" #include "gnunet_mesh_service.h" #include "mesh.h" #include "mesh_protocol.h" #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__) #define DEBUG_ACK GNUNET_YES /******************************************************************************/ /************************ DATA STRUCTURES ****************************/ /******************************************************************************/ /** * Transmission queue to the service */ struct GNUNET_MESH_TransmitHandle { /** * Double Linked list */ struct GNUNET_MESH_TransmitHandle *next; /** * Double Linked list */ struct GNUNET_MESH_TransmitHandle *prev; /** * Tunnel this message is sent on / for (may be NULL for control messages). */ struct GNUNET_MESH_Tunnel *tunnel; /** * Callback to obtain the message to transmit, or NULL if we * got the message in 'data'. Notice that messages built * by 'notify' need to be encapsulated with information about * the 'target'. */ GNUNET_CONNECTION_TransmitReadyNotify notify; /** * Closure for 'notify' */ void *notify_cls; /** * How long is this message valid. Once the timeout has been * reached, the message must no longer be sent. If this * is a message with a 'notify' callback set, the 'notify' * function should be called with 'buf' NULL and size 0. */ struct GNUNET_TIME_Absolute timeout; /** * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER. */ GNUNET_SCHEDULER_TaskIdentifier timeout_task; /** * Target of the message, 0 for multicast. This field * is only valid if 'notify' is non-NULL. */ GNUNET_PEER_Id target; /** * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL. */ size_t size; }; /** * Opaque handle to the service. */ struct GNUNET_MESH_Handle { /** * Handle to the server connection, to send messages later */ struct GNUNET_CLIENT_Connection *client; /** * Set of handlers used for processing incoming messages in the tunnels */ const struct GNUNET_MESH_MessageHandler *message_handlers; /** * Set of applications that should be claimed to be offered at this node. * Note that this is just informative, the appropiate handlers must be * registered independently and the mapping is up to the developer of the * client application. */ GNUNET_MESH_ApplicationType *applications; /** * Double linked list of the tunnels this client is connected to, head. */ struct GNUNET_MESH_Tunnel *tunnels_head; /** * Double linked list of the tunnels this client is connected to, tail. */ struct GNUNET_MESH_Tunnel *tunnels_tail; /** * Callback for inbound tunnel creation */ GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel; /** * Callback for inbound tunnel disconnection */ GNUNET_MESH_TunnelEndHandler *cleaner; /** * Handle to cancel pending transmissions in case of disconnection */ struct GNUNET_CLIENT_TransmitHandle *th; /** * Closure for all the handlers given by the client */ void *cls; /** * Messages to send to the service, head. */ struct GNUNET_MESH_TransmitHandle *th_head; /** * Messages to send to the service, tail. */ struct GNUNET_MESH_TransmitHandle *th_tail; /** * tid of the next tunnel to create (to avoid reusing IDs often) */ MESH_TunnelNumber next_tid; /** * Number of handlers in the handlers array. */ unsigned int n_handlers; /** * Number of applications in the applications array. */ unsigned int n_applications; /** * Have we started the task to receive messages from the service * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message. */ int in_receive; /** * Configuration given by the client, in case of reconnection */ const struct GNUNET_CONFIGURATION_Handle *cfg; /** * Time to the next reconnect in case one reconnect fails */ struct GNUNET_TIME_Relative reconnect_time; /** * Task for trying to reconnect. */ GNUNET_SCHEDULER_TaskIdentifier reconnect_task; /** * Monitor callback */ GNUNET_MESH_TunnelsCB tunnels_cb; /** * Monitor callback closure. */ void *tunnels_cls; /** * Tunnel callback. */ GNUNET_MESH_TunnelCB tunnel_cb; /** * Tunnel callback closure. */ void *tunnel_cls; /** * All the peer in the tunnel so far. */ struct GNUNET_PeerIdentity *peers; /** * How many peers we have in this tunnel so far. */ unsigned int tunnel_npeers; #if DEBUG_ACK unsigned int acks_sent; unsigned int acks_recv; #endif }; /** * Description of a peer */ struct GNUNET_MESH_Peer { /** * ID of the peer in short form */ GNUNET_PEER_Id id; /** * Tunnel this peer belongs to */ struct GNUNET_MESH_Tunnel *t; /** * Flag indicating whether service has informed about its connection */ int connected; }; /** * Opaque handle to a tunnel. */ struct GNUNET_MESH_Tunnel { /** * DLL next */ struct GNUNET_MESH_Tunnel *next; /** * DLL prev */ struct GNUNET_MESH_Tunnel *prev; /** * Callback to execute when peers connect to the tunnel */ GNUNET_MESH_PeerConnectHandler connect_handler; /** * Callback to execute when peers disconnect from the tunnel */ GNUNET_MESH_PeerDisconnectHandler disconnect_handler; /** * Closure for the connect/disconnect handlers */ void *cls; /** * Handle to the mesh this tunnel belongs to */ struct GNUNET_MESH_Handle *mesh; /** * Local ID of the tunnel */ MESH_TunnelNumber tid; /** * Owner of the tunnel. 0 if the tunnel is the local client. */ GNUNET_PEER_Id owner; /** * All peers added to the tunnel */ struct GNUNET_MESH_Peer **peers; /** * List of application types that have been requested for this tunnel */ GNUNET_MESH_ApplicationType *apps; /** * Any data the caller wants to put in here */ void *ctx; /** * Number of peers added to the tunnel */ unsigned int npeers; /** * Size of packet queued in this tunnel */ unsigned int packet_size; /** * Number of applications requested this tunnel */ unsigned int napps; /** * Is the tunnel throttled to the slowest peer? */ int speed_min; /** * Is the tunnel allowed to buffer? */ int buffering; /** * Next packet ID to send. */ uint32_t next_send_pid; /** * Maximum allowed PID to send (ACK recevied). */ uint32_t max_send_pid; /** * Last pid received from the service. */ uint32_t last_recv_pid; /** * Which ACK value have we last sent to the service? */ uint32_t max_recv_pid; }; /******************************************************************************/ /*********************** DECLARATIONS *************************/ /******************************************************************************/ /** * Function called to send a message to the service. * "buf" will be NULL and "size" zero if the socket was closed for writing in * the meantime. * * @param cls closure, the mesh handle * @param size number of bytes available in buf * @param buf where the callee should write the connect message * @return number of bytes written to buf */ static size_t send_callback (void *cls, size_t size, void *buf); /******************************************************************************/ /*********************** AUXILIARY FUNCTIONS *************************/ /******************************************************************************/ /** * Check if transmission is a payload packet. * * @param th Transmission handle. * * @return GNUNET_YES if it is a payload packet, * GNUNET_NO if it is a mesh management packet. */ static int th_is_payload (struct GNUNET_MESH_TransmitHandle *th) { return (th->notify != NULL) ? GNUNET_YES : GNUNET_NO; } /** * Check whether there is any message ready in the queue and find the size. * * @param h Mesh handle. * * @return The size of the first ready message in the queue, * 0 if there is none. */ static size_t message_ready_size (struct GNUNET_MESH_Handle *h) { struct GNUNET_MESH_TransmitHandle *th; struct GNUNET_MESH_Tunnel *t; for (th = h->th_head; NULL != th; th = th->next) { t = th->tunnel; if (GNUNET_NO == th_is_payload (th)) { LOG (GNUNET_ERROR_TYPE_DEBUG, " message internal\n"); return th->size; } if (GNUNET_NO == GMC_is_pid_bigger(t->next_send_pid, t->max_send_pid)) { LOG (GNUNET_ERROR_TYPE_DEBUG, " message payload ok (%u <= %u)\n", t->next_send_pid, t->max_send_pid); return th->size; } } return 0; } /** * Get the tunnel handler for the tunnel specified by id from the given handle * @param h Mesh handle * @param tid ID of the wanted tunnel * @return handle to the required tunnel or NULL if not found */ static struct GNUNET_MESH_Tunnel * retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid) { struct GNUNET_MESH_Tunnel *t; t = h->tunnels_head; while (t != NULL) { if (t->tid == tid) return t; t = t->next; } return NULL; } /** * Create a new tunnel and insert it in the tunnel list of the mesh handle * @param h Mesh handle * @param tid desired tid of the tunnel, 0 to assign one automatically * @return handle to the created tunnel */ static struct GNUNET_MESH_Tunnel * create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid) { struct GNUNET_MESH_Tunnel *t; t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel)); GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t); t->mesh = h; if (0 == tid) { t->tid = h->next_tid; while (NULL != retrieve_tunnel (h, h->next_tid)) { h->next_tid++; h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV; h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; } } else { t->tid = tid; } t->max_send_pid = INITIAL_WINDOW_SIZE - 1; t->last_recv_pid = (uint32_t) -1; t->buffering = GNUNET_YES; return t; } /** * Destroy the specified tunnel. * - Destroys all peers, calling the disconnect callback on each if needed * - Cancels all outgoing traffic for that tunnel, calling respective notifys * - Calls cleaner if tunnel was inbound * - Frees all memory used * * @param t Pointer to the tunnel. * @param call_cleaner Whether to call the cleaner handler. * * @return Handle to the required tunnel or NULL if not found. */ static void destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner) { struct GNUNET_MESH_Handle *h; struct GNUNET_PeerIdentity pi; struct GNUNET_MESH_TransmitHandle *th; struct GNUNET_MESH_TransmitHandle *next; unsigned int i; LOG (GNUNET_ERROR_TYPE_DEBUG, "destroy_tunnel %X\n", t->tid); if (NULL == t) { GNUNET_break (0); return; } h = t->mesh; /* disconnect all peers */ GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t); for (i = 0; i < t->npeers; i++) { if ( (NULL != t->disconnect_handler) && t->peers[i]->connected) { GNUNET_PEER_resolve (t->peers[i]->id, &pi); t->disconnect_handler (t->cls, &pi); } GNUNET_PEER_change_rc (t->peers[i]->id, -1); GNUNET_free (t->peers[i]); } /* signal tunnel destruction */ if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) ) h->cleaner (h->cls, t, t->ctx); /* check that clients did not leave messages behind in the queue */ for (th = h->th_head; NULL != th; th = next) { next = th->next; if (th->tunnel != t) continue; /* Clients should have aborted their requests already. * Management traffic should be ok, as clients can't cancel that */ GNUNET_break (GNUNET_NO == th_is_payload(th)); GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th); /* clean up request */ if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task) GNUNET_SCHEDULER_cancel (th->timeout_task); GNUNET_free (th); } /* if there are no more pending requests with mesh service, cancel active request */ /* Note: this should be unnecessary... */ if ((0 == message_ready_size (h)) && (NULL != h->th)) { GNUNET_CLIENT_notify_transmit_ready_cancel (h->th); h->th = NULL; } if (t->npeers > 0) GNUNET_free (t->peers); if (0 != t->owner) GNUNET_PEER_change_rc (t->owner, -1); if (0 != t->napps && t->apps) GNUNET_free (t->apps); GNUNET_free (t); return; } /** * Get the peer descriptor for the peer with id from the given tunnel * @param t Tunnel handle * @param id Short form ID of the wanted peer * @return handle to the requested peer or NULL if not found */ static struct GNUNET_MESH_Peer * retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id) { unsigned int i; for (i = 0; i < t->npeers; i++) if (t->peers[i]->id == id) return t->peers[i]; return NULL; } /** * Add a peer into a tunnel * @param t Tunnel handle * @param pi Full ID of the new peer * @return handle to the newly created peer */ static struct GNUNET_MESH_Peer * add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t, const struct GNUNET_PeerIdentity *pi) { struct GNUNET_MESH_Peer *p; GNUNET_PEER_Id id; if (0 != t->owner) { GNUNET_break (0); return NULL; } id = GNUNET_PEER_intern (pi); p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer)); p->id = id; p->t = t; GNUNET_array_append (t->peers, t->npeers, p); return p; } /** * Remove a peer from a tunnel * @param p Peer handle */ static void remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p) { unsigned int i; for (i = 0; i < p->t->npeers; i++) { if (p->t->peers[i] == p) break; } if (i == p->t->npeers) { GNUNET_break (0); return; } p->t->peers[i] = p->t->peers[p->t->npeers - 1]; GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1); } /** * Notify client that the transmission has timed out * * @param cls closure * @param tc task context */ static void timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct GNUNET_MESH_TransmitHandle *th = cls; struct GNUNET_MESH_Handle *mesh; mesh = th->tunnel->mesh; GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th); th->tunnel->packet_size = 0; if (GNUNET_YES == th_is_payload (th)) th->notify (th->notify_cls, 0, NULL); GNUNET_free (th); if ((0 == message_ready_size (mesh)) && (NULL != mesh->th)) { /* nothing ready to transmit, no point in asking for transmission */ GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th); mesh->th = NULL; } } /** * Add a transmit handle to the transmission queue and set the * timeout if needed. * * @param h mesh handle with the queue head and tail * @param th handle to the packet to be transmitted */ static void add_to_queue (struct GNUNET_MESH_Handle *h, struct GNUNET_MESH_TransmitHandle *th) { GNUNET_CONTAINER_DLL_insert_tail (h->th_head, h->th_tail, th); if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value) return; th->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout), &timeout_transmission, th); } /** * Auxiliary function to send an already constructed packet to the service. * Takes care of creating a new queue element, copying the message and * calling the tmt_rdy function if necessary. * * @param h mesh handle * @param msg message to transmit * @param tunnel tunnel this send is related to (NULL if N/A) */ static void send_packet (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *msg, struct GNUNET_MESH_Tunnel *tunnel); /** * Send an ack on the tunnel to confirm the processing of a message. * * @param h Mesh handle. * @param t Tunnel on which to send the ACK. */ static void send_ack (struct GNUNET_MESH_Handle *h, struct GNUNET_MESH_Tunnel *t) { struct GNUNET_MESH_LocalAck msg; uint32_t delta; delta = t->max_recv_pid - t->last_recv_pid; if (delta > ACK_THRESHOLD) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Not sending ACK on tunnel %X: ACK: %u, PID: %u, buffer %u\n", t->tid, t->max_recv_pid, t->last_recv_pid, delta); return; } if (GNUNET_YES == t->buffering) t->max_recv_pid = t->last_recv_pid + INITIAL_WINDOW_SIZE; else t->max_recv_pid = t->last_recv_pid + 1; LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK on tunnel %X: %u\n", t->tid, t->max_recv_pid); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK); msg.header.size = htons (sizeof (msg)); msg.tunnel_id = htonl (t->tid); msg.max_pid = htonl (t->max_recv_pid); #if DEBUG_ACK t->mesh->acks_sent++; #endif send_packet (h, &msg.header, t); return; } /** * Reconnect callback: tries to reconnect again after a failer previous * reconnecttion * @param cls closure (mesh handle) * @param tc task context */ static void reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc); /** * Send a connect packet to the service with the applications and types * requested by the user. * * @param h The mesh handle. * */ static void send_connect (struct GNUNET_MESH_Handle *h) { size_t size; size = sizeof (struct GNUNET_MESH_ClientConnect); size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType); size += h->n_handlers * sizeof (uint16_t); { char buf[size] GNUNET_ALIGN; struct GNUNET_MESH_ClientConnect *msg; GNUNET_MESH_ApplicationType *apps; uint16_t napps; uint16_t *types; uint16_t ntypes; /* build connection packet */ msg = (struct GNUNET_MESH_ClientConnect *) buf; msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT); msg->header.size = htons (size); apps = (GNUNET_MESH_ApplicationType *) &msg[1]; for (napps = 0; napps < h->n_applications; napps++) { apps[napps] = htonl (h->applications[napps]); LOG (GNUNET_ERROR_TYPE_DEBUG, " app %u\n", h->applications[napps]); } types = (uint16_t *) & apps[napps]; for (ntypes = 0; ntypes < h->n_handlers; ntypes++) { types[ntypes] = htons (h->message_handlers[ntypes].type); LOG (GNUNET_ERROR_TYPE_DEBUG, " type %u\n", h->message_handlers[ntypes].type); } msg->applications = htons (napps); msg->types = htons (ntypes); LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending %lu bytes long message %d types and %d apps\n", ntohs (msg->header.size), ntypes, napps); send_packet (h, &msg->header, NULL); } } /** * Reconnect to the service, retransmit all infomation to try to restore the * original state. * * @param h handle to the mesh * * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...) */ static int do_reconnect (struct GNUNET_MESH_Handle *h) { struct GNUNET_MESH_Tunnel *t; unsigned int i; LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, "******** on %p *******\n", h); LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n"); /* disconnect */ if (NULL != h->th) { GNUNET_CLIENT_notify_transmit_ready_cancel (h->th); h->th = NULL; } if (NULL != h->client) { GNUNET_CLIENT_disconnect (h->client); } /* connect again */ h->client = GNUNET_CLIENT_connect ("mesh", h->cfg); if (h->client == NULL) { h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h); h->reconnect_time = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, GNUNET_TIME_relative_multiply (h->reconnect_time, 2)); LOG (GNUNET_ERROR_TYPE_DEBUG, "Next retry in %s\n", GNUNET_STRINGS_relative_time_to_string (h->reconnect_time, GNUNET_NO)); GNUNET_break (0); return GNUNET_NO; } else { h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS; } send_connect (h); /* Rebuild all tunnels */ for (t = h->tunnels_head; NULL != t; t = t->next) { struct GNUNET_MESH_TunnelMessage tmsg; struct GNUNET_MESH_PeerControl pmsg; if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { /* Tunnel was created by service (incoming tunnel) */ /* TODO: Notify service of missing tunnel, to request * creator to recreate path (find a path to him via DHT?) */ continue; } t->next_send_pid = 0; t->max_send_pid = INITIAL_WINDOW_SIZE - 1; t->last_recv_pid = (uint32_t) -1; tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); tmsg.tunnel_id = htonl (t->tid); send_packet (h, &tmsg.header, t); pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD); pmsg.tunnel_id = htonl (t->tid); /* Reconnect all peers */ /* If the tunnel was "by type", dont connect individual peers */ for (i = 0; i < t->npeers && 0 == t->napps; i++) { GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer); if (NULL != t->disconnect_handler && t->peers[i]->connected) t->disconnect_handler (t->cls, &pmsg.peer); send_packet (t->mesh, &pmsg.header, t); } /* Reconnect all types, if any */ for (i = 0; i < t->napps; i++) { struct GNUNET_MESH_ConnectPeerByType msg; msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE); msg.tunnel_id = htonl (t->tid); msg.type = htonl (t->apps[i]); send_packet (t->mesh, &msg.header, t); } if (GNUNET_NO == t->buffering) GNUNET_MESH_tunnel_buffer (t, GNUNET_NO); if (GNUNET_YES == t->speed_min) GNUNET_MESH_tunnel_speed_min (t); } return GNUNET_YES; } /** * Reconnect callback: tries to reconnect again after a failer previous * reconnecttion * @param cls closure (mesh handle) * @param tc task context */ static void reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc) { struct GNUNET_MESH_Handle *h = cls; h->reconnect_task = GNUNET_SCHEDULER_NO_TASK; if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN)) return; do_reconnect (h); } /** * Reconnect to the service, retransmit all infomation to try to restore the * original state. * * @param h handle to the mesh * * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...) */ static void reconnect (struct GNUNET_MESH_Handle *h) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Requested RECONNECT\n"); h->in_receive = GNUNET_NO; if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task) h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h); } /******************************************************************************/ /*********************** RECEIVE HANDLERS ****************************/ /******************************************************************************/ /** * Process the new tunnel notification and add it to the tunnels in the handle * * @param h The mesh handle * @param msg A message with the details of the new incoming tunnel */ static void process_tunnel_created (struct GNUNET_MESH_Handle *h, const struct GNUNET_MESH_TunnelNotification *msg) { struct GNUNET_MESH_Tunnel *t; MESH_TunnelNumber tid; tid = ntohl (msg->tunnel_id); LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating incoming tunnel %X\n", tid); if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { GNUNET_break (0); return; } if (NULL != h->new_tunnel) { struct GNUNET_ATS_Information atsi; t = create_tunnel (h, tid); t->owner = GNUNET_PEER_intern (&msg->peer); t->npeers = 1; t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *)); t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer)); t->peers[0]->t = t; t->peers[0]->connected = 1; t->peers[0]->id = t->owner; GNUNET_PEER_change_rc (t->owner, 1); t->mesh = h; t->tid = tid; if ((msg->opt & MESH_TUNNEL_OPT_NOBUFFER) != 0) t->buffering = GNUNET_NO; else t->buffering = GNUNET_YES; if ((msg->opt & MESH_TUNNEL_OPT_SPEED_MIN) != 0) t->speed_min = GNUNET_YES; atsi.type = 0; atsi.value = 0; LOG (GNUNET_ERROR_TYPE_DEBUG, " created tunnel %p\n", t); t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi); LOG (GNUNET_ERROR_TYPE_DEBUG, "User notified\n"); } else { struct GNUNET_MESH_TunnelMessage d_msg; LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming tunnels\n"); d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); d_msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); d_msg.tunnel_id = msg->tunnel_id; send_packet (h, &d_msg.header, NULL); } return; } /** * Process the tunnel destroy notification and free associated resources * * @param h The mesh handle * @param msg A message with the details of the tunnel being destroyed */ static void process_tunnel_destroy (struct GNUNET_MESH_Handle *h, const struct GNUNET_MESH_TunnelMessage *msg) { struct GNUNET_MESH_Tunnel *t; MESH_TunnelNumber tid; tid = ntohl (msg->tunnel_id); t = retrieve_tunnel (h, tid); if (NULL == t) { return; } if (0 == t->owner) { GNUNET_break (0); } LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X destroyed\n", t->tid); destroy_tunnel (t, GNUNET_YES); return; } /** * Process the new peer event and notify the upper level of it * * @param h The mesh handle * @param msg A message with the details of the peer event */ static void process_peer_event (struct GNUNET_MESH_Handle *h, const struct GNUNET_MESH_PeerControl *msg) { struct GNUNET_MESH_Tunnel *t; struct GNUNET_MESH_Peer *p; struct GNUNET_ATS_Information atsi; GNUNET_PEER_Id id; uint16_t size; LOG (GNUNET_ERROR_TYPE_DEBUG, "processig peer event\n"); size = ntohs (msg->header.size); if (size != sizeof (struct GNUNET_MESH_PeerControl)) { GNUNET_break (0); return; } t = retrieve_tunnel (h, ntohl (msg->tunnel_id)); if (NULL == t) { GNUNET_break (0); return; } id = GNUNET_PEER_search (&msg->peer); if ((p = retrieve_peer (t, id)) == NULL) p = add_peer_to_tunnel (t, &msg->peer); if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "adding peer\n"); if (NULL != t->connect_handler) { atsi.type = 0; atsi.value = 0; t->connect_handler (t->cls, &msg->peer, &atsi); } p->connected = 1; } else { LOG (GNUNET_ERROR_TYPE_DEBUG, "removing peer\n"); if (NULL != t->disconnect_handler && p->connected) { t->disconnect_handler (t->cls, &msg->peer); } remove_peer_from_tunnel (p); GNUNET_free (p); } LOG (GNUNET_ERROR_TYPE_DEBUG, "processing peer event END\n"); } /** * Process the incoming data packets * * @param h The mesh handle * @param message A message encapsulating the data * * @return GNUNET_YES if everything went fine * GNUNET_NO if client closed connection (h no longer valid) */ static int process_incoming_data (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *message) { const struct GNUNET_MessageHeader *payload; const struct GNUNET_MESH_MessageHandler *handler; const struct GNUNET_PeerIdentity *peer; struct GNUNET_MESH_Unicast *ucast; struct GNUNET_MESH_Multicast *mcast; struct GNUNET_MESH_ToOrigin *to_orig; struct GNUNET_MESH_Tunnel *t; unsigned int i; uint32_t pid; uint16_t type; LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n"); type = ntohs (message->type); switch (type) { case GNUNET_MESSAGE_TYPE_MESH_UNICAST: ucast = (struct GNUNET_MESH_Unicast *) message; t = retrieve_tunnel (h, ntohl (ucast->tid)); payload = (struct GNUNET_MessageHeader *) &ucast[1]; peer = &ucast->oid; pid = ntohl (ucast->pid); LOG (GNUNET_ERROR_TYPE_DEBUG, " ucast on tunnel %s [%X]\n", GNUNET_i2s (peer), ntohl (ucast->tid)); break; case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: mcast = (struct GNUNET_MESH_Multicast *) message; t = retrieve_tunnel (h, ntohl (mcast->tid)); payload = (struct GNUNET_MessageHeader *) &mcast[1]; peer = &mcast->oid; pid = ntohl (mcast->pid); LOG (GNUNET_ERROR_TYPE_DEBUG, " mcast on tunnel %s [%X]\n", GNUNET_i2s (peer), ntohl (mcast->tid)); break; case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: to_orig = (struct GNUNET_MESH_ToOrigin *) message; t = retrieve_tunnel (h, ntohl (to_orig->tid)); payload = (struct GNUNET_MessageHeader *) &to_orig[1]; peer = &to_orig->sender; pid = ntohl (to_orig->pid); LOG (GNUNET_ERROR_TYPE_DEBUG, " torig on tunnel %s [%X]\n", GNUNET_i2s (peer), ntohl (to_orig->tid)); break; default: GNUNET_break (0); return GNUNET_YES; } LOG (GNUNET_ERROR_TYPE_DEBUG, " pid %u\n", pid); if (NULL == t) { /* Tunnel was ignored/destroyed, probably service didn't get it yet */ LOG (GNUNET_ERROR_TYPE_DEBUG, " ignored!\n"); return GNUNET_YES; } if (GNUNET_YES == GMC_is_pid_bigger(pid, t->max_recv_pid)) { GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_WARNING, " unauthorized message! (%u, max %u)\n", pid, t->max_recv_pid); // FIXME fc what now? accept? reject? return GNUNET_YES; } t->last_recv_pid = pid; type = ntohs (payload->type); send_ack (h, t); for (i = 0; i < h->n_handlers; i++) { handler = &h->message_handlers[i]; if (handler->type == type) { struct GNUNET_ATS_Information atsi; atsi.type = 0; atsi.value = 0; if (GNUNET_OK != handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "callback caused disconnection\n"); GNUNET_MESH_disconnect (h); return GNUNET_NO; } else { LOG (GNUNET_ERROR_TYPE_DEBUG, "callback completed successfully\n"); } } } return GNUNET_YES; } /** * Process a local ACK message, enabling the client to send * more data to the service. * * @param h Mesh handle. * @param message Message itself. */ static void process_ack (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_LocalAck *msg; struct GNUNET_MESH_Tunnel *t; uint32_t ack; LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK!\n"); h->acks_recv++; msg = (struct GNUNET_MESH_LocalAck *) message; t = retrieve_tunnel (h, ntohl (msg->tunnel_id)); if (NULL == t) { LOG (GNUNET_ERROR_TYPE_WARNING, "ACK on unknown tunnel %X\n", ntohl (msg->tunnel_id)); return; } ack = ntohl (msg->max_pid); LOG (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X, ack %u!\n", t->tid, ack); if (GNUNET_YES == GMC_is_pid_bigger(ack, t->max_send_pid)) t->max_send_pid = ack; else return; if (NULL == h->th && 0 < t->packet_size) { LOG (GNUNET_ERROR_TYPE_DEBUG, " tmt rdy was NULL, requesting!\n", t->tid, ack); h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, t->packet_size, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_callback, h); } } /** * Process a local reply about info on all tunnels, pass info to the user. * * @param h Mesh handle. * @param message Message itself. */ static void process_get_tunnels (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_LocalMonitor *msg; uint32_t npeers; GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get Tunnels messasge received\n"); if (NULL == h->tunnels_cb) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n"); return; } msg = (struct GNUNET_MESH_LocalMonitor *) message; npeers = ntohl (msg->npeers); if (ntohs (message->size) != (sizeof (struct GNUNET_MESH_LocalMonitor) + npeers * sizeof (struct GNUNET_PeerIdentity))) { GNUNET_break_op (0); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get tunnels message: size %hu - expected %u (%u peers)\n", ntohs (message->size), sizeof (struct GNUNET_MESH_LocalMonitor) + npeers * sizeof (struct GNUNET_PeerIdentity), npeers); return; } h->tunnels_cb (h->tunnels_cls, &msg->owner, ntohl (msg->tunnel_id), (struct GNUNET_PeerIdentity *) &msg[1], npeers); } /** * Process a local monitor_tunnel reply, pass info to the user. * * @param h Mesh handle. * @param message Message itself. */ static void process_show_tunnel (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *message) { struct GNUNET_MESH_LocalMonitor *msg; struct GNUNET_PeerIdentity *new_peers; uint32_t *new_parents; size_t esize; uint32_t npeers; unsigned int i; GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show Tunnel messasge received\n"); if (NULL == h->tunnel_cb) { GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n"); return; } /* Verify message sanity */ msg = (struct GNUNET_MESH_LocalMonitor *) message; npeers = ntohl (msg->npeers); esize = sizeof (struct GNUNET_MESH_LocalMonitor); esize += npeers * (sizeof (struct GNUNET_PeerIdentity) + sizeof (uint32_t)); if (ntohs (message->size) != esize) { GNUNET_break_op (0); GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show tunnel message: size %hu - expected %u (%u peers)\n", ntohs (message->size), esize, npeers); h->tunnel_cb (h->tunnel_cls, NULL, NULL); h->tunnel_cb = NULL; h->tunnel_cls = NULL; h->tunnel_npeers = 0; GNUNET_free_non_null (h->peers); h->peers = NULL; return; } new_peers = (struct GNUNET_PeerIdentity *) &msg[1]; new_parents = (uint32_t *) &new_peers[npeers]; h->peers = GNUNET_realloc (h->peers, h->tunnel_npeers + npeers); memcpy (&h->peers[h->tunnel_npeers], new_peers, npeers * sizeof (struct GNUNET_PeerIdentity)); h->tunnel_npeers += npeers; for (i = 0; i < npeers; i++) h->tunnel_cb (h->tunnel_cls, &new_peers[i], &h->peers[new_parents[i]]); } /** * Function to process all messages received from the service * * @param cls closure * @param msg message received, NULL on timeout or fatal error */ static void msg_received (void *cls, const struct GNUNET_MessageHeader *msg) { struct GNUNET_MESH_Handle *h = cls; if (msg == NULL) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Mesh service disconnected, reconnecting\n", h); reconnect (h); return; } LOG (GNUNET_ERROR_TYPE_DEBUG, "\n", GNUNET_MESH_DEBUG_M2S (ntohs (msg->type))); LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a message: %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (msg->type))); switch (ntohs (msg->type)) { /* Notify of a new incoming tunnel */ case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE: process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg); break; /* Notify of a tunnel disconnection */ case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY: process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg); break; /* Notify of a new peer or a peer disconnect in the tunnel */ case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD: case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL: process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg); break; /* Notify of a new data packet in the tunnel */ case GNUNET_MESSAGE_TYPE_MESH_UNICAST: case GNUNET_MESSAGE_TYPE_MESH_MULTICAST: case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN: if (GNUNET_NO == process_incoming_data (h, msg)) return; break; case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK: process_ack (h, msg); break; case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS: process_get_tunnels (h, msg); break; case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL: process_show_tunnel (h, msg); break; default: /* We shouldn't get any other packages, log and ignore */ LOG (GNUNET_ERROR_TYPE_WARNING, "unsolicited message form service (type %s)\n", GNUNET_MESH_DEBUG_M2S (ntohs (msg->type))); } LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n"); if (GNUNET_YES == h->in_receive) { GNUNET_CLIENT_receive (h->client, &msg_received, h, GNUNET_TIME_UNIT_FOREVER_REL); } else { LOG (GNUNET_ERROR_TYPE_DEBUG, "in receive off, not calling CLIENT_receive\n"); } } /******************************************************************************/ /************************ SEND FUNCTIONS ****************************/ /******************************************************************************/ /** * Function called to send a message to the service. * "buf" will be NULL and "size" zero if the socket was closed for writing in * the meantime. * * @param cls closure, the mesh handle * @param size number of bytes available in buf * @param buf where the callee should write the connect message * @return number of bytes written to buf */ static size_t send_callback (void *cls, size_t size, void *buf) { struct GNUNET_MESH_Handle *h = cls; struct GNUNET_MESH_TransmitHandle *th; struct GNUNET_MESH_TransmitHandle *next; struct GNUNET_MESH_Tunnel *t; char *cbuf = buf; size_t tsize; size_t psize; size_t nsize; LOG (GNUNET_ERROR_TYPE_DEBUG, "\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() Buffer %u\n", size); if ((0 == size) || (NULL == buf)) { LOG (GNUNET_ERROR_TYPE_DEBUG, "Received NULL send callback on %p\n", h); reconnect (h); h->th = NULL; return 0; } tsize = 0; next = h->th_head; nsize = message_ready_size (h); while ((NULL != (th = next)) && (0 < nsize) && (size >= nsize)) { t = th->tunnel; if (GNUNET_YES == th_is_payload (th)) { LOG (GNUNET_ERROR_TYPE_DEBUG, " payload\n"); if (GNUNET_YES == GMC_is_pid_bigger(t->next_send_pid, t->max_send_pid)) { /* This tunnel is not ready to transmit yet, try next message */ next = th->next; continue; } t->packet_size = 0; if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { /* traffic to origin */ struct GNUNET_MESH_ToOrigin to; struct GNUNET_MessageHeader *mh; GNUNET_assert (size >= th->size); mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)]; psize = th->notify (th->notify_cls, size - sizeof (to), mh); LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin, type %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); if (psize > 0) { psize += sizeof (to); GNUNET_assert (size >= psize); to.header.size = htons (psize); to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN); to.tid = htonl (t->tid); to.pid = htonl (t->next_send_pid); to.ttl = 0; memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity)); memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity)); memcpy (cbuf, &to, sizeof (to)); } } else if (th->target == 0) { /* multicast */ struct GNUNET_MESH_Multicast mc; struct GNUNET_MessageHeader *mh; GNUNET_assert (size >= th->size); mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)]; psize = th->notify (th->notify_cls, size - sizeof (mc), mh); LOG (GNUNET_ERROR_TYPE_DEBUG, " multicast, type %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); if (psize > 0) { psize += sizeof (mc); GNUNET_assert (size >= psize); mc.header.size = htons (psize); mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST); mc.tid = htonl (t->tid); mc.pid = htonl (t->next_send_pid); mc.ttl = 0; memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); memcpy (cbuf, &mc, sizeof (mc)); } } else { /* unicast */ struct GNUNET_MESH_Unicast uc; struct GNUNET_MessageHeader *mh; GNUNET_assert (size >= th->size); mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)]; psize = th->notify (th->notify_cls, size - sizeof (uc), mh); LOG (GNUNET_ERROR_TYPE_DEBUG, " unicast, type %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); if (psize > 0) { psize += sizeof (uc); GNUNET_assert (size >= psize); uc.header.size = htons (psize); uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST); uc.tid = htonl (t->tid); uc.pid = htonl (t->next_send_pid); uc.ttl = 0; memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity)); GNUNET_PEER_resolve (th->target, &uc.destination); memcpy (cbuf, &uc, sizeof (uc)); } } t->next_send_pid++; } else { struct GNUNET_MessageHeader *mh = (struct GNUNET_MessageHeader *) &th[1]; LOG (GNUNET_ERROR_TYPE_DEBUG, " mesh traffic, type %s\n", GNUNET_MESH_DEBUG_M2S (ntohs (mh->type))); memcpy (cbuf, &th[1], th->size); psize = th->size; } if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK) GNUNET_SCHEDULER_cancel (th->timeout_task); GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th); GNUNET_free (th); next = h->th_head; nsize = message_ready_size (h); cbuf += psize; size -= psize; tsize += psize; } LOG (GNUNET_ERROR_TYPE_DEBUG, " total size: %u\n", tsize); h->th = NULL; size = message_ready_size (h); if (0 != size) { LOG (GNUNET_ERROR_TYPE_DEBUG, " next size: %u\n", size); h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, size, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_callback, h); } else { if (NULL != h->th_head) LOG (GNUNET_ERROR_TYPE_DEBUG, " can't transmit any more\n"); else LOG (GNUNET_ERROR_TYPE_DEBUG, " nothing left to transmit\n"); } if (GNUNET_NO == h->in_receive) { LOG (GNUNET_ERROR_TYPE_DEBUG, " start receiving from service\n"); h->in_receive = GNUNET_YES; GNUNET_CLIENT_receive (h->client, &msg_received, h, GNUNET_TIME_UNIT_FOREVER_REL); } LOG (GNUNET_ERROR_TYPE_DEBUG, "Send packet() END\n"); return tsize; } /** * Auxiliary function to send an already constructed packet to the service. * Takes care of creating a new queue element, copying the message and * calling the tmt_rdy function if necessary. * * @param h mesh handle * @param msg message to transmit * @param tunnel tunnel this send is related to (NULL if N/A) */ static void send_packet (struct GNUNET_MESH_Handle *h, const struct GNUNET_MessageHeader *msg, struct GNUNET_MESH_Tunnel *tunnel) { struct GNUNET_MESH_TransmitHandle *th; size_t msize; LOG (GNUNET_ERROR_TYPE_DEBUG, " Sending message to service: %s\n", GNUNET_MESH_DEBUG_M2S(ntohs(msg->type))); msize = ntohs (msg->size); th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize); th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS; th->size = msize; th->tunnel = tunnel; memcpy (&th[1], msg, msize); add_to_queue (h, th); LOG (GNUNET_ERROR_TYPE_DEBUG, " queued\n"); if (NULL != h->th) return; LOG (GNUNET_ERROR_TYPE_DEBUG, " calling ntfy tmt rdy for %u bytes\n", msize); h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, msize, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_callback, h); } /******************************************************************************/ /********************** API CALL DEFINITIONS *************************/ /******************************************************************************/ /** * Connect to the mesh service. * * @param cfg configuration to use * @param cls closure for the various callbacks that follow * (including handlers in the handlers array) * @param new_tunnel function called when an *inbound* tunnel is created * @param cleaner function called when an *inbound* tunnel is destroyed by the * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy * is called on the tunnel * @param handlers callbacks for messages we care about, NULL-terminated * note that the mesh is allowed to drop notifications about * inbound messages if the client does not process them fast * enough (for this notification type, a bounded queue is used) * @param stypes list of the applications that this client claims to provide * @return handle to the mesh service NULL on error * (in this case, init is never called) */ struct GNUNET_MESH_Handle * GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls, GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel, GNUNET_MESH_TunnelEndHandler cleaner, const struct GNUNET_MESH_MessageHandler *handlers, const GNUNET_MESH_ApplicationType *stypes) { struct GNUNET_MESH_Handle *h; size_t size; LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n"); h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle)); LOG (GNUNET_ERROR_TYPE_DEBUG, " addr %p\n", h); h->cfg = cfg; h->new_tunnel = new_tunnel; h->cleaner = cleaner; h->client = GNUNET_CLIENT_connect ("mesh", cfg); if (h->client == NULL) { GNUNET_break (0); GNUNET_free (h); return NULL; } h->cls = cls; h->message_handlers = handlers; h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI; h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS; h->reconnect_task = GNUNET_SCHEDULER_NO_TASK; /* count apps */ for (h->n_applications = 0; stypes && stypes[h->n_applications]; h->n_applications++) ; if (0 < h->n_applications) { size = h->n_applications * sizeof (GNUNET_MESH_ApplicationType *); h->applications = GNUNET_malloc (size); memcpy (h->applications, stypes, size); } /* count handlers */ for (h->n_handlers = 0; handlers && handlers[h->n_handlers].type; h->n_handlers++) ; send_connect (h); LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n"); return h; } /** * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel * disconnect callbacks will be called on any still connected peers, notifying * about their disconnection. The registered inbound tunnel cleaner will be * called should any inbound tunnels still exist. * * @param handle connection to mesh to disconnect */ void GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle) { struct GNUNET_MESH_Tunnel *t; struct GNUNET_MESH_Tunnel *aux; struct GNUNET_MESH_TransmitHandle *th; LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH DISCONNECT\n"); #if DEBUG_ACK LOG (GNUNET_ERROR_TYPE_INFO, "Sent %d ACKs\n", handle->acks_sent); LOG (GNUNET_ERROR_TYPE_INFO, "Recv %d ACKs\n\n", handle->acks_recv); #endif t = handle->tunnels_head; while (NULL != t) { aux = t->next; if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) { GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel %X not destroyed\n", t->tid); } destroy_tunnel (t, GNUNET_YES); t = aux; } while ( (th = handle->th_head) != NULL) { struct GNUNET_MessageHeader *msg; /* Make sure it is an allowed packet (everything else should have been * already canceled). */ GNUNET_break (GNUNET_NO == th_is_payload (th)); msg = (struct GNUNET_MessageHeader *) &th[1]; switch (ntohs(msg->type)) { case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT: case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY: case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS: case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL: break; default: GNUNET_break (0); LOG (GNUNET_ERROR_TYPE_ERROR, "unexpected msg %u\n", ntohs(msg->type)); } GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th); GNUNET_free (th); } if (NULL != handle->th) { GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th); handle->th = NULL; } if (NULL != handle->client) { GNUNET_CLIENT_disconnect (handle->client); handle->client = NULL; } if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task) { GNUNET_SCHEDULER_cancel(handle->reconnect_task); handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK; } GNUNET_free_non_null (handle->applications); GNUNET_free (handle); } /** * Announce to ther peer the availability of services described by the regex, * in order to be reachable to other peers via connect_by_string. * * Note that the first 8 characters are considered to be part of a prefix, * (for instance 'gnunet://'). If you put a variable part in there (*, +. ()), * all matching strings will be stored in the DHT. * * @param h Handle to mesh. * @param regex String with the regular expression describing local services. * @param compression_characters How many characters can be assigned to one * edge of the graph. The bigger the variability * of the data, the smaller this parameter should * be (down to 1). * For maximum compression, use strlen (regex) * or 0 (special value). Use with care! */ void GNUNET_MESH_announce_regex (struct GNUNET_MESH_Handle *h, const char *regex, unsigned int compression_characters) { struct GNUNET_MESH_RegexAnnounce *msg; size_t payload; size_t len; size_t msgsize; size_t offset; char buffer[UINT16_MAX]; len = strlen (regex); payload = UINT16_MAX - sizeof(struct GNUNET_MESH_RegexAnnounce); msg = (struct GNUNET_MESH_RegexAnnounce *) buffer; msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ANNOUNCE_REGEX); msg->compression_characters = htons (compression_characters); offset = 0; do { msgsize = (len - offset > payload) ? payload : len - offset; memcpy (&msg[1], ®ex[offset], msgsize); offset += msgsize; msgsize += sizeof(struct GNUNET_MESH_RegexAnnounce); msg->header.size = htons (msgsize); msg->last = htons (offset >= len); send_packet (h, &msg->header, NULL); } while (len > offset); } /** * Create a new tunnel (we're initiator and will be allowed to add/remove peers * and to broadcast). * * @param h mesh handle * @param tunnel_ctx client's tunnel context to associate with the tunnel * @param connect_handler function to call when peers are actually connected * @param disconnect_handler function to call when peers are disconnected * @param handler_cls closure for connect/disconnect handlers */ struct GNUNET_MESH_Tunnel * GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx, GNUNET_MESH_PeerConnectHandler connect_handler, GNUNET_MESH_PeerDisconnectHandler disconnect_handler, void *handler_cls) { struct GNUNET_MESH_Tunnel *t; struct GNUNET_MESH_TunnelMessage msg; LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating new tunnel\n"); t = create_tunnel (h, 0); LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", t); LOG (GNUNET_ERROR_TYPE_DEBUG, " number %X\n", t->tid); t->connect_handler = connect_handler; t->disconnect_handler = disconnect_handler; t->cls = handler_cls; t->ctx = tunnel_ctx; msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE); msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg.tunnel_id = htonl (t->tid); send_packet (h, &msg.header, t); return t; } /** * Destroy an existing tunnel. The existing callback for the tunnel will NOT * be called. * * @param tunnel tunnel handle */ void GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel) { struct GNUNET_MESH_Handle *h; struct GNUNET_MESH_TunnelMessage msg; struct GNUNET_MESH_TransmitHandle *th; LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying tunnel\n"); h = tunnel->mesh; msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY); msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg.tunnel_id = htonl (tunnel->tid); th = h->th_head; while (th != NULL) { struct GNUNET_MESH_TransmitHandle *aux; if (th->tunnel == tunnel) { aux = th->next; /* FIXME call the handler? */ if (GNUNET_YES == th_is_payload (th)) th->notify (th->notify_cls, 0, NULL); GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th); GNUNET_free (th); th = aux; } else th = th->next; } destroy_tunnel (tunnel, GNUNET_NO); send_packet (h, &msg.header, NULL); } /** * Request that the tunnel data rate is limited to the speed of the slowest * receiver. * * @param tunnel Tunnel affected. */ void GNUNET_MESH_tunnel_speed_min (struct GNUNET_MESH_Tunnel *tunnel) { struct GNUNET_MESH_TunnelMessage msg; struct GNUNET_MESH_Handle *h; h = tunnel->mesh; tunnel->speed_min = GNUNET_YES; msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MIN); msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg.tunnel_id = htonl (tunnel->tid); send_packet (h, &msg.header, NULL); } /** * Request that the tunnel data rate is limited to the speed of the fastest * receiver. This is the default behavior. * * @param tunnel Tunnel affected. */ void GNUNET_MESH_tunnel_speed_max (struct GNUNET_MESH_Tunnel *tunnel) { struct GNUNET_MESH_TunnelMessage msg; struct GNUNET_MESH_Handle *h; h = tunnel->mesh; tunnel->speed_min = GNUNET_NO; msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_MAX); msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg.tunnel_id = htonl (tunnel->tid); send_packet (h, &msg.header, NULL); } /** * Turn on/off the buffering status of the tunnel. * * @param tunnel Tunnel affected. * @param buffer GNUNET_YES to turn buffering on (default), * GNUNET_NO otherwise. */ void GNUNET_MESH_tunnel_buffer (struct GNUNET_MESH_Tunnel *tunnel, int buffer) { struct GNUNET_MESH_TunnelMessage msg; struct GNUNET_MESH_Handle *h; h = tunnel->mesh; tunnel->buffering = buffer; tunnel->max_send_pid = tunnel->next_send_pid; if (GNUNET_YES == buffer) msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_BUFFER); else msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_NOBUFFER); msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage)); msg.tunnel_id = htonl (tunnel->tid); send_packet (h, &msg.header, NULL); } /** * Request that a peer should be added to the tunnel. The existing * connect handler will be called ONCE with either success or failure. * This function should NOT be called again with the same peer before the * connect handler is called. * FIXME: I think the above documentation is false. I think it should * read: "The connect handler will be called once the peer was actually * successfully added to the multicast group. This function should * not be called twice for the same peer (unless, of course, * the peer was removed using GNUNET_MESH_peer_Request_connect_del in * the meantime). * * @param tunnel handle to existing tunnel * @param peer peer to add */ void GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel, const struct GNUNET_PeerIdentity *peer) { struct GNUNET_MESH_PeerControl msg; GNUNET_PEER_Id peer_id; unsigned int i; peer_id = GNUNET_PEER_intern (peer); for (i = 0; i < tunnel->npeers; i++) { if (tunnel->peers[i]->id == peer_id) { /* Peer already exists in tunnel */ GNUNET_PEER_change_rc (peer_id, -1); GNUNET_break (0); return; } } if (NULL == add_peer_to_tunnel (tunnel, peer)) return; msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD); msg.tunnel_id = htonl (tunnel->tid); msg.peer = *peer; send_packet (tunnel->mesh, &msg.header, tunnel); } /** * Request that a peer should be removed from the tunnel. The existing * disconnect handler will be called ONCE if we were connected. * * @param tunnel handle to existing tunnel * @param peer peer to remove */ void GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel, const struct GNUNET_PeerIdentity *peer) { struct GNUNET_MESH_PeerControl msg; GNUNET_PEER_Id peer_id; unsigned int i; peer_id = GNUNET_PEER_search (peer); if (0 == peer_id) { GNUNET_break (0); return; } for (i = 0; i < tunnel->npeers; i++) if (tunnel->peers[i]->id == peer_id) break; if (i == tunnel->npeers) { GNUNET_break (0); return; } if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1) tunnel->disconnect_handler (tunnel->cls, peer); GNUNET_PEER_change_rc (peer_id, -1); GNUNET_free (tunnel->peers[i]); tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1]; GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1); msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL); msg.tunnel_id = htonl (tunnel->tid); memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity)); send_packet (tunnel->mesh, &msg.header, tunnel); } /** * Request that the mesh should try to connect to a peer supporting the given * message type. * * @param tunnel handle to existing tunnel * @param app_type application type that must be supported by the peer (MESH * should discover peer in proximity handling this type) */ void GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel, GNUNET_MESH_ApplicationType app_type) { struct GNUNET_MESH_ConnectPeerByType msg; GNUNET_array_append (tunnel->apps, tunnel->napps, app_type); LOG (GNUNET_ERROR_TYPE_DEBUG, "* CONNECT BY TYPE *\n"); msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE); msg.tunnel_id = htonl (tunnel->tid); msg.type = htonl (app_type); send_packet (tunnel->mesh, &msg.header, tunnel); } /** * Request that the mesh should try to connect to a peer matching the * description given in the service string. * * FIXME: allow multiple? how to deal with reconnect? * * @param tunnel handle to existing tunnel * @param description string describing the destination node requirements */ void GNUNET_MESH_peer_request_connect_by_string (struct GNUNET_MESH_Tunnel *tunnel, const char *description) { struct GNUNET_MESH_ConnectPeerByString *m; size_t len; size_t msgsize; len = strlen (description); msgsize = sizeof(struct GNUNET_MESH_ConnectPeerByString) + len; GNUNET_assert (UINT16_MAX > msgsize); { char buffer[msgsize]; m = (struct GNUNET_MESH_ConnectPeerByString *) buffer; m->header.size = htons (msgsize); m->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_STRING); m->tunnel_id = htonl (tunnel->tid); memcpy(&m[1], description, len); send_packet (tunnel->mesh, &m->header, tunnel); } } /** * Request that the given peer isn't added to this tunnel in calls to * connect_by_* calls, (due to misbehaviour, bad performance, ...). * * @param tunnel handle to existing tunnel. * @param peer peer identity of the peer which should be blacklisted * for the tunnel. */ void GNUNET_MESH_peer_blacklist (struct GNUNET_MESH_Tunnel *tunnel, const struct GNUNET_PeerIdentity *peer) { struct GNUNET_MESH_PeerControl msg; msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_BLACKLIST); msg.tunnel_id = htonl (tunnel->tid); msg.peer = *peer; send_packet (tunnel->mesh, &msg.header, tunnel); return; } /** * Request that the given peer isn't blacklisted anymore from this tunnel, * and therefore can be added in future calls to connect_by_*. * The peer must have been previously blacklisted for this tunnel. * * @param tunnel handle to existing tunnel. * @param peer peer identity of the peer which shouldn't be blacklisted * for the tunnel anymore. */ void GNUNET_MESH_peer_unblacklist (struct GNUNET_MESH_Tunnel *tunnel, const struct GNUNET_PeerIdentity *peer) { struct GNUNET_MESH_PeerControl msg; msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_UNBLACKLIST); msg.tunnel_id = htonl (tunnel->tid); msg.peer = *peer; send_packet (tunnel->mesh, &msg.header, tunnel); return; } /** * Ask the mesh to call "notify" once it is ready to transmit the * given number of bytes to the specified tunnel or target. * Only one call can be active at any time, to issue another request, * wait for the callback or cancel the current request. * * @param tunnel tunnel to use for transmission * @param cork is corking allowed for this transmission? * @param maxdelay how long can the message wait? * @param target destination for the message * NULL for multicast to all tunnel targets * @param notify_size how many bytes of buffer space does notify want? * @param notify function to call when buffer space is available; * will be called with NULL on timeout or if the overall queue * for this peer is larger than queue_size and this is currently * the message with the lowest priority * @param notify_cls closure for notify * @return non-NULL if the notify callback was queued, * NULL if we can not even queue the request (insufficient * memory); if NULL is returned, "notify" will NOT be called. */ struct GNUNET_MESH_TransmitHandle * GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork, struct GNUNET_TIME_Relative maxdelay, const struct GNUNET_PeerIdentity *target, size_t notify_size, GNUNET_CONNECTION_TransmitReadyNotify notify, void *notify_cls) { struct GNUNET_MESH_TransmitHandle *th; size_t overhead; GNUNET_assert (NULL != tunnel); LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, " on tunnel %X\n", tunnel->tid); if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin\n"); else if (NULL != target) LOG (GNUNET_ERROR_TYPE_DEBUG, " target %s\n", GNUNET_i2s (target)); else LOG (GNUNET_ERROR_TYPE_DEBUG, " target multicast\n"); LOG (GNUNET_ERROR_TYPE_DEBUG, " payload size %u\n", notify_size); GNUNET_assert (NULL != notify); GNUNET_assert (0 == tunnel->packet_size); // Only one data packet allowed th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle)); th->tunnel = tunnel; th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay); th->target = GNUNET_PEER_intern (target); if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV) overhead = sizeof (struct GNUNET_MESH_ToOrigin); else if (NULL == target) overhead = sizeof (struct GNUNET_MESH_Multicast); else overhead = sizeof (struct GNUNET_MESH_Unicast); tunnel->packet_size = th->size = notify_size + overhead; LOG (GNUNET_ERROR_TYPE_DEBUG, " total size %u\n", th->size); th->notify = notify; th->notify_cls = notify_cls; add_to_queue (tunnel->mesh, th); if (NULL != tunnel->mesh->th) return th; if (GMC_is_pid_bigger(tunnel->next_send_pid, tunnel->max_send_pid)) return th; LOG (GNUNET_ERROR_TYPE_DEBUG, " call notify tmt rdy\n"); tunnel->mesh->th = GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size, GNUNET_TIME_UNIT_FOREVER_REL, GNUNET_YES, &send_callback, tunnel->mesh); LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY END\n"); return th; } /** * Cancel the specified transmission-ready notification. * * @param th handle that was returned by "notify_transmit_ready". */ void GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th) { struct GNUNET_MESH_Handle *mesh; th->tunnel->packet_size = 0; mesh = th->tunnel->mesh; if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK) GNUNET_SCHEDULER_cancel (th->timeout_task); GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th); GNUNET_free (th); if ((0 == message_ready_size (mesh)) && (NULL != mesh->th)) { /* queue empty, no point in asking for transmission */ GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th); mesh->th = NULL; } } /** * Request information about the running mesh peer. * The callback will be called for every tunnel known to the service, * listing all active peers that blong to the tunnel. * * If called again on the same handle, it will overwrite the previous * callback and cls. To retrieve the cls, monitor_cancel must be * called first. * * WARNING: unstable API, likely to change in the future! * * @param h Handle to the mesh peer. * @param callback Function to call with the requested data. * @param callback_cls Closure for @c callback. */ void GNUNET_MESH_get_tunnels (struct GNUNET_MESH_Handle *h, GNUNET_MESH_TunnelsCB callback, void *callback_cls) { struct GNUNET_MessageHeader msg; msg.size = htons (sizeof (msg)); msg.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNELS); send_packet (h, &msg, NULL); h->tunnels_cb = callback; h->tunnels_cls = callback_cls; return; } /** * Cancel a monitor request. The monitor callback will not be called. * * @param h Mesh handle. * * @return Closure given to GNUNET_MESH_monitor, if any. */ void * GNUNET_MESH_get_tunnels_cancel (struct GNUNET_MESH_Handle *h) { void *cls; cls = h->tunnels_cls; h->tunnels_cb = NULL; h->tunnels_cls = NULL; return cls; } /** * Request information about a specific tunnel of the running mesh peer. * * WARNING: unstable API, likely to change in the future! * * @param h Handle to the mesh peer. * @param initiator ID of the owner of the tunnel. * @param tunnel_number Tunnel number. * @param callback Function to call with the requested data. * @param callback_cls Closure for @c callback. */ void GNUNET_MESH_show_tunnel (struct GNUNET_MESH_Handle *h, struct GNUNET_PeerIdentity *initiator, unsigned int tunnel_number, GNUNET_MESH_TunnelCB callback, void *callback_cls) { struct GNUNET_MESH_LocalMonitor msg; msg.header.size = htons (sizeof (msg)); msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_TUNNEL); msg.npeers = htonl (0); msg.owner = *initiator; msg.tunnel_id = htonl (tunnel_number); msg.reserved = 0; send_packet (h, &msg.header, NULL); h->tunnel_cb = callback; h->tunnel_cls = callback_cls; return; } /** * Transition API for tunnel ctx management */ void GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data) { tunnel->ctx = data; } /** * Transition API for tunnel ctx management */ void * GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel) { return tunnel->ctx; }