2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
4 GNUnet is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published
6 by the Free Software Foundation; either version 3, or (at your
7 option) any later version.
8 GNUnet is distributed in the hope that it will be useful, but
9 WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 General Public License for more details.
12 You should have received a copy of the GNU General Public License
13 along with GNUnet; see the file COPYING. If not, write to the
14 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
15 Boston, MA 02111-1307, USA.
19 * @file mesh/mesh_api.c
20 * @brief mesh api: client implementation of mesh service
21 * @author Bartlomiej Polot
26 * - AUXILIARY FUNCTIONS
29 * - API CALL DEFINITIONS
34 #if 0 /* keep Emacsens' auto-indent happy */
40 #include "gnunet_common.h"
41 #include "gnunet_client_lib.h"
42 #include "gnunet_util_lib.h"
43 #include "gnunet_peer_lib.h"
44 #include "gnunet_mesh_service.h"
46 #include "mesh_protocol.h"
48 #define MESH_API_DEBUG GNUNET_YES
51 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
56 /******************************************************************************/
57 /************************ DATA STRUCTURES ****************************/
58 /******************************************************************************/
61 * Transmission queue to the service
63 struct GNUNET_MESH_TransmitHandle
69 struct GNUNET_MESH_TransmitHandle *next;
74 struct GNUNET_MESH_TransmitHandle *prev;
77 * Tunnel this message is sent on / for (may be NULL for control messages).
79 struct GNUNET_MESH_Tunnel *tunnel;
82 * Callback to obtain the message to transmit, or NULL if we
83 * got the message in 'data'. Notice that messages built
84 * by 'notify' need to be encapsulated with information about
87 GNUNET_CONNECTION_TransmitReadyNotify notify;
90 * Closure for 'notify'
95 * How long is this message valid. Once the timeout has been
96 * reached, the message must no longer be sent. If this
97 * is a message with a 'notify' callback set, the 'notify'
98 * function should be called with 'buf' NULL and size 0.
100 struct GNUNET_TIME_Absolute timeout;
103 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
105 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
108 * Priority of the message. The queue is sorted by priority,
109 * control messages have the maximum priority (UINT32_MAX).
114 * Target of the message, 0 for multicast. This field
115 * is only valid if 'notify' is non-NULL.
117 GNUNET_PEER_Id target;
120 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
127 * Opaque handle to the service.
129 struct GNUNET_MESH_Handle
133 * Handle to the server connection, to send messages later
135 struct GNUNET_CLIENT_Connection *client;
138 * Set of handlers used for processing incoming messages in the tunnels
140 const struct GNUNET_MESH_MessageHandler *message_handlers;
143 * Set of applications that should be claimed to be offered at this node.
144 * Note that this is just informative, the appropiate handlers must be
145 * registered independently and the mapping is up to the developer of the
146 * client application.
148 const GNUNET_MESH_ApplicationType *applications;
151 * Double linked list of the tunnels this client is connected to.
153 struct GNUNET_MESH_Tunnel *tunnels_head;
154 struct GNUNET_MESH_Tunnel *tunnels_tail;
157 * Callback for inbound tunnel creation
159 GNUNET_MESH_InboundTunnelNotificationHandler *new_tunnel;
162 * Callback for inbound tunnel disconnection
164 GNUNET_MESH_TunnelEndHandler *cleaner;
167 * Handle to cancel pending transmissions in case of disconnection
169 struct GNUNET_CLIENT_TransmitHandle *th;
172 * Closure for all the handlers given by the client
177 * Messages to send to the service
179 struct GNUNET_MESH_TransmitHandle *th_head;
180 struct GNUNET_MESH_TransmitHandle *th_tail;
183 * tid of the next tunnel to create (to avoid reusing IDs often)
185 MESH_TunnelNumber next_tid;
186 unsigned int n_handlers;
187 unsigned int n_applications;
188 unsigned int max_queue_size;
191 * Have we started the task to receive messages from the service
192 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
197 * Number of packets queued
199 unsigned int npackets;
202 * Configuration given by the client, in case of reconnection
204 const struct GNUNET_CONFIGURATION_Handle *cfg;
207 * Time to the next reconnect in case one reconnect fails
209 struct GNUNET_TIME_Relative reconnect_time;
214 * Description of a peer
216 struct GNUNET_MESH_Peer
219 * ID of the peer in short form
224 * Tunnel this peer belongs to
226 struct GNUNET_MESH_Tunnel *t;
229 * Flag indicating whether service has informed about its connection
237 * Opaque handle to a tunnel.
239 struct GNUNET_MESH_Tunnel
245 struct GNUNET_MESH_Tunnel *next;
246 struct GNUNET_MESH_Tunnel *prev;
249 * Callback to execute when peers connect to the tunnel
251 GNUNET_MESH_PeerConnectHandler connect_handler;
254 * Callback to execute when peers disconnect from the tunnel
256 GNUNET_MESH_PeerDisconnectHandler disconnect_handler;
259 * Closure for the connect/disconnect handlers
264 * Handle to the mesh this tunnel belongs to
266 struct GNUNET_MESH_Handle *mesh;
269 * Local ID of the tunnel
271 MESH_TunnelNumber tid;
274 * Owner of the tunnel. 0 if the tunnel is the local client.
276 GNUNET_PEER_Id owner;
279 * All peers added to the tunnel
281 struct GNUNET_MESH_Peer **peers;
284 * List of application types that have been requested for this tunnel
286 GNUNET_MESH_ApplicationType *apps;
289 * Any data the caller wants to put in here
294 * Number of peers added to the tunnel
299 * Number of packets queued in this tunnel
301 unsigned int npackets;
304 * Number of applications requested this tunnel
311 /******************************************************************************/
312 /*********************** AUXILIARY FUNCTIONS *************************/
313 /******************************************************************************/
316 * Get the tunnel handler for the tunnel specified by id from the given handle
317 * @param h Mesh handle
318 * @param tid ID of the wanted tunnel
319 * @return handle to the required tunnel or NULL if not found
321 static struct GNUNET_MESH_Tunnel *
322 retrieve_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
324 struct GNUNET_MESH_Tunnel *t;
338 * Create a new tunnel and insert it in the tunnel list of the mesh handle
339 * @param h Mesh handle
340 * @param tid desired tid of the tunnel, 0 to assign one automatically
341 * @return handle to the created tunnel
343 static struct GNUNET_MESH_Tunnel *
344 create_tunnel (struct GNUNET_MESH_Handle *h, MESH_TunnelNumber tid)
346 struct GNUNET_MESH_Tunnel *t;
348 t = GNUNET_malloc (sizeof (struct GNUNET_MESH_Tunnel));
349 GNUNET_CONTAINER_DLL_insert (h->tunnels_head, h->tunnels_tail, t);
353 t->tid = h->next_tid;
354 while (NULL != retrieve_tunnel (h, h->next_tid))
357 h->next_tid &= ~GNUNET_MESH_LOCAL_TUNNEL_ID_SERV;
358 h->next_tid |= GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
370 * Destroy the specified tunnel.
371 * - Destroys all peers, calling the disconnect callback on each if needed
372 * - Cancels all outgoing traffic for that tunnel, calling respective notifys
373 * - Calls cleaner if tunnel was inbound
374 * - Frees all memory used
376 * @param t Pointer to the tunnel.
377 * @param call_handler Whether to call the cleaner handler.
379 * @return Handle to the required tunnel or NULL if not found.
382 destroy_tunnel (struct GNUNET_MESH_Tunnel *t, int call_cleaner)
384 struct GNUNET_MESH_Handle *h;
385 struct GNUNET_PeerIdentity pi;
386 struct GNUNET_MESH_TransmitHandle *th;
387 struct GNUNET_MESH_TransmitHandle *next;
397 /* disconnect all peers */
398 GNUNET_CONTAINER_DLL_remove (h->tunnels_head, h->tunnels_tail, t);
399 for (i = 0; i < t->npeers; i++)
401 if ( (NULL != t->disconnect_handler) && t->peers[i]->connected)
403 GNUNET_PEER_resolve (t->peers[i]->id, &pi);
404 t->disconnect_handler (t->cls, &pi);
406 GNUNET_PEER_change_rc (t->peers[i]->id, -1);
407 GNUNET_free (t->peers[i]);
410 /* signal tunnel destruction */
411 if ( (NULL != h->cleaner) && (0 != t->owner) && (GNUNET_YES == call_cleaner) )
412 h->cleaner (h->cls, t, t->ctx);
414 /* check that clients did not leave messages behind in the queue */
415 for (th = h->th_head; NULL != th; th = next)
420 /* we should not really get here, as clients should have
421 aborted their requests already.
422 Management traffic should be ok, as clients can't cancel that */
423 GNUNET_break (NULL == th->notify);
424 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
426 /* clean up request */
427 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
428 GNUNET_SCHEDULER_cancel (th->timeout_task);
432 /* if there are no more pending requests with mesh service, cancel active request */
433 /* Note: this should be unnecessary... */
434 if ( (NULL == h->th_head) && (NULL != h->th))
436 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
442 GNUNET_free (t->peers);
444 GNUNET_PEER_change_rc (t->owner, -1);
445 if (0 != t->napps && t->apps)
446 GNUNET_free (t->apps);
453 * Get the peer descriptor for the peer with id from the given tunnel
454 * @param t Tunnel handle
455 * @param id Short form ID of the wanted peer
456 * @return handle to the requested peer or NULL if not found
458 static struct GNUNET_MESH_Peer *
459 retrieve_peer (struct GNUNET_MESH_Tunnel *t, GNUNET_PEER_Id id)
463 for (i = 0; i < t->npeers; i++)
464 if (t->peers[i]->id == id)
471 * Add a peer into a tunnel
472 * @param t Tunnel handle
473 * @param pi Full ID of the new peer
474 * @return handle to the newly created peer
476 static struct GNUNET_MESH_Peer *
477 add_peer_to_tunnel (struct GNUNET_MESH_Tunnel *t,
478 const struct GNUNET_PeerIdentity *pi)
480 struct GNUNET_MESH_Peer *p;
488 id = GNUNET_PEER_intern (pi);
490 p = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
493 GNUNET_array_append (t->peers, t->npeers, p);
499 * Remove a peer from a tunnel
500 * @param p Peer handle
503 remove_peer_from_tunnel (struct GNUNET_MESH_Peer *p)
507 for (i = 0; i < p->t->npeers; i++)
509 if (p->t->peers[i] == p)
512 if (i == p->t->npeers)
517 p->t->peers[i] = p->t->peers[p->t->npeers - 1];
518 GNUNET_array_grow (p->t->peers, p->t->npeers, p->t->npeers - 1);
523 * Notify client that the transmission has timed out
525 * @param tc task context
528 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
530 struct GNUNET_MESH_TransmitHandle *th = cls;
531 struct GNUNET_MESH_Handle *mesh;
533 mesh = th->tunnel->mesh;
534 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
535 if (th->notify != NULL)
536 th->notify (th->notify_cls, 0, NULL);
538 if ((NULL == mesh->th_head) && (NULL != mesh->th))
540 /* queue empty, no point in asking for transmission */
541 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
548 * Add a transmit handle to the transmission queue by priority and set the
551 * @param h mesh handle with the queue head and tail
552 * @param th handle to the packet to be transmitted
555 add_to_queue (struct GNUNET_MESH_Handle *h,
556 struct GNUNET_MESH_TransmitHandle *th)
558 struct GNUNET_MESH_TransmitHandle *p;
561 while ((NULL != p) && (th->priority <= p->priority))
567 GNUNET_CONTAINER_DLL_insert_after (h->th_head, h->th_tail, p, th);
568 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value == th->timeout.abs_value)
571 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
572 (th->timeout), &timeout_transmission, th);
577 * Auxiliary function to send an already constructed packet to the service.
578 * Takes care of creating a new queue element, copying the message and
579 * calling the tmt_rdy function if necessary.
581 * @param h mesh handle
582 * @param msg message to transmit
583 * @param tunnel tunnel this send is related to (NULL if N/A)
586 send_packet (struct GNUNET_MESH_Handle *h,
587 const struct GNUNET_MessageHeader *msg,
588 struct GNUNET_MESH_Tunnel *tunnel);
592 * Reconnect callback: tries to reconnect again after a failer previous
594 * @param cls closure (mesh handle)
595 * @param tc task context
598 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
602 * Send a connect packet to the service with the applications and types
603 * requested by the user.
605 * @param h The mesh handle.
609 send_connect (struct GNUNET_MESH_Handle *h)
613 size = sizeof (struct GNUNET_MESH_ClientConnect);
614 size += h->n_applications * sizeof (GNUNET_MESH_ApplicationType);
615 size += h->n_handlers * sizeof (uint16_t);
618 struct GNUNET_MESH_ClientConnect *msg;
619 GNUNET_MESH_ApplicationType *apps;
624 /* build connection packet */
625 msg = (struct GNUNET_MESH_ClientConnect *) buf;
626 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
627 msg->header.size = htons (size);
628 apps = (GNUNET_MESH_ApplicationType *) &msg[1];
629 for (napps = 0; napps < h->n_applications; napps++)
631 apps[napps] = htonl (h->applications[napps]);
632 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: app %u\n", h->applications[napps]);
634 types = (uint16_t *) & apps[napps];
635 for (ntypes = 0; ntypes < h->n_handlers; ntypes++)
636 types[ntypes] = htons (h->message_handlers[ntypes].type);
637 msg->applications = htons (napps);
638 msg->types = htons (ntypes);
640 LOG (GNUNET_ERROR_TYPE_DEBUG,
641 "mesh: Sending %lu bytes long message %d types and %d apps\n",
642 ntohs (msg->header.size), ntypes, napps);
644 send_packet (h, &msg->header, NULL);
650 * Reconnect to the service, retransmit all infomation to try to restore the
653 * @param h handle to the mesh
655 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
658 reconnect (struct GNUNET_MESH_Handle *h)
660 struct GNUNET_MESH_Tunnel *t;
664 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: ******* RECONNECT *******\n");
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: *****************************\n");
668 h->in_receive = GNUNET_NO;
672 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
675 if (NULL != h->client)
677 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
681 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
682 if (h->client == NULL)
684 GNUNET_SCHEDULER_add_delayed (h->reconnect_time, &reconnect_cbk, h);
686 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
687 GNUNET_TIME_relative_multiply
688 (h->reconnect_time, 2));
689 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Next retry in %sms\n",
690 GNUNET_TIME_relative_to_string (h->reconnect_time));
696 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
699 /* Rebuild all tunnels */
700 for (t = h->tunnels_head; NULL != t; t = t->next)
702 struct GNUNET_MESH_TunnelMessage tmsg;
703 struct GNUNET_MESH_PeerControl pmsg;
705 if (t->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
707 /* Tunnel was created by service (incoming tunnel) */
708 /* TODO: Notify service of missing tunnel, to request
709 * creator to recreate path (find a path to him via DHT?)
713 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
714 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
715 tmsg.tunnel_id = htonl (t->tid);
716 send_packet (h, &tmsg.header, t);
718 pmsg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
719 pmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
720 pmsg.tunnel_id = htonl (t->tid);
722 /* Reconnect all peers */
723 for (i = 0; i < t->npeers; i++)
725 GNUNET_PEER_resolve (t->peers[i]->id, &pmsg.peer);
726 if (NULL != t->disconnect_handler && t->peers[i]->connected)
727 t->disconnect_handler (t->cls, &pmsg.peer);
728 /* If the tunnel was "by type", dont connect individual peers */
730 send_packet (t->mesh, &pmsg.header, t);
732 /* Reconnect all types, if any */
733 for (i = 0; i < t->napps; i++)
735 struct GNUNET_MESH_ConnectPeerByType msg;
737 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
738 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
739 msg.tunnel_id = htonl (t->tid);
740 msg.type = htonl (t->apps[i]);
741 send_packet (t->mesh, &msg.header, t);
748 * Reconnect callback: tries to reconnect again after a failer previous
750 * @param cls closure (mesh handle)
751 * @param tc task context
754 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
756 struct GNUNET_MESH_Handle *h = cls;
758 if (tc->reason == GNUNET_SCHEDULER_REASON_SHUTDOWN)
764 /******************************************************************************/
765 /*********************** RECEIVE HANDLERS ****************************/
766 /******************************************************************************/
769 * Process the new tunnel notification and add it to the tunnels in the handle
771 * @param h The mesh handle
772 * @param msg A message with the details of the new incoming tunnel
775 process_tunnel_created (struct GNUNET_MESH_Handle *h,
776 const struct GNUNET_MESH_TunnelNotification *msg)
778 struct GNUNET_MESH_Tunnel *t;
779 MESH_TunnelNumber tid;
781 tid = ntohl (msg->tunnel_id);
782 if (tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
787 t = create_tunnel (h, tid);
788 t->owner = GNUNET_PEER_intern (&msg->peer);
790 t->peers = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer *));
791 t->peers[0] = GNUNET_malloc (sizeof (struct GNUNET_MESH_Peer));
793 t->peers[0]->connected = 1;
794 t->peers[0]->id = t->owner;
795 GNUNET_PEER_change_rc (t->owner, 1);
798 if (NULL != h->new_tunnel)
800 struct GNUNET_ATS_Information atsi;
804 t->ctx = h->new_tunnel (h->cls, t, &msg->peer, &atsi);
807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: new incoming tunnel %X\n",
815 * Process the tunnel destroy notification and free associated resources
817 * @param h The mesh handle
818 * @param msg A message with the details of the tunnel being destroyed
821 process_tunnel_destroy (struct GNUNET_MESH_Handle *h,
822 const struct GNUNET_MESH_TunnelMessage *msg)
824 struct GNUNET_MESH_Tunnel *t;
825 MESH_TunnelNumber tid;
827 tid = ntohl (msg->tunnel_id);
828 t = retrieve_tunnel (h, tid);
839 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %u destroyed\n", t->tid);
841 destroy_tunnel (t, GNUNET_YES);
847 * Process the new peer event and notify the upper level of it
849 * @param h The mesh handle
850 * @param msg A message with the details of the peer event
853 process_peer_event (struct GNUNET_MESH_Handle *h,
854 const struct GNUNET_MESH_PeerControl *msg)
856 struct GNUNET_MESH_Tunnel *t;
857 struct GNUNET_MESH_Peer *p;
858 struct GNUNET_ATS_Information atsi;
862 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processig peer event\n");
863 size = ntohs (msg->header.size);
864 if (size != sizeof (struct GNUNET_MESH_PeerControl))
869 t = retrieve_tunnel (h, ntohl (msg->tunnel_id));
875 id = GNUNET_PEER_search (&msg->peer);
876 if ((p = retrieve_peer (t, id)) == NULL)
877 p = add_peer_to_tunnel (t, &msg->peer);
878 if (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD == ntohs (msg->header.type))
880 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: adding peer\n");
881 if (NULL != t->connect_handler)
885 t->connect_handler (t->cls, &msg->peer, &atsi);
891 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: removing peer\n");
892 if (NULL != t->disconnect_handler && p->connected)
894 t->disconnect_handler (t->cls, &msg->peer);
896 remove_peer_from_tunnel (p);
899 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: processing peer event END\n");
904 * Process the incoming data packets
906 * @param h The mesh handle
907 * @param message A message encapsulating the data
909 * @return GNUNET_YES if everything went fine
910 * GNUNET_NO if client closed connection (h no longer valid)
913 process_incoming_data (struct GNUNET_MESH_Handle *h,
914 const struct GNUNET_MessageHeader *message)
916 const struct GNUNET_MessageHeader *payload;
917 const struct GNUNET_MESH_MessageHandler *handler;
918 const struct GNUNET_PeerIdentity *peer;
919 struct GNUNET_MESH_Unicast *ucast;
920 struct GNUNET_MESH_Multicast *mcast;
921 struct GNUNET_MESH_ToOrigin *to_orig;
922 struct GNUNET_MESH_Tunnel *t;
926 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: Got a data message!\n");
927 type = ntohs (message->type);
930 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
931 ucast = (struct GNUNET_MESH_Unicast *) message;
933 t = retrieve_tunnel (h, ntohl (ucast->tid));
934 payload = (struct GNUNET_MessageHeader *) &ucast[1];
936 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: ucast on tunnel %s [%x]\n",
937 GNUNET_i2s (peer), ntohl (ucast->tid));
939 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
940 mcast = (struct GNUNET_MESH_Multicast *) message;
941 t = retrieve_tunnel (h, ntohl (mcast->tid));
942 payload = (struct GNUNET_MessageHeader *) &mcast[1];
944 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: mcast on tunnel %s [%x]\n",
945 GNUNET_i2s (peer), ntohl (mcast->tid));
947 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
948 to_orig = (struct GNUNET_MESH_ToOrigin *) message;
949 t = retrieve_tunnel (h, ntohl (to_orig->tid));
950 payload = (struct GNUNET_MessageHeader *) &to_orig[1];
951 peer = &to_orig->sender;
952 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: torig on tunnel %s [%x]\n",
953 GNUNET_i2s (peer), ntohl (to_orig->tid));
964 type = ntohs (payload->type);
965 for (i = 0; i < h->n_handlers; i++)
967 handler = &h->message_handlers[i];
968 if (handler->type == type)
970 struct GNUNET_ATS_Information atsi;
975 handler->callback (h->cls, t, &t->ctx, peer, payload, &atsi))
977 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH: callback caused disconnection\n");
978 GNUNET_MESH_disconnect (h);
984 LOG (GNUNET_ERROR_TYPE_DEBUG,
985 "MESH: callback completed successfully\n");
996 * Function to process all messages received from the service
999 * @param msg message received, NULL on timeout or fatal error
1002 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1004 struct GNUNET_MESH_Handle *h = cls;
1011 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: received a message type %hu from MESH\n",
1013 switch (ntohs (msg->type))
1015 /* Notify of a new incoming tunnel */
1016 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE:
1017 process_tunnel_created (h, (struct GNUNET_MESH_TunnelNotification *) msg);
1019 /* Notify of a tunnel disconnection */
1020 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1021 process_tunnel_destroy (h, (struct GNUNET_MESH_TunnelMessage *) msg);
1023 /* Notify of a new peer or a peer disconnect in the tunnel */
1024 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD:
1025 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL:
1026 process_peer_event (h, (struct GNUNET_MESH_PeerControl *) msg);
1028 /* Notify of a new data packet in the tunnel */
1029 case GNUNET_MESSAGE_TYPE_MESH_UNICAST:
1030 case GNUNET_MESSAGE_TYPE_MESH_MULTICAST:
1031 case GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN:
1032 if (GNUNET_NO == process_incoming_data (h, msg))
1035 /* We shouldn't get any other packages, log and ignore */
1037 LOG (GNUNET_ERROR_TYPE_WARNING,
1038 "MESH: unsolicited message form service (type %d)\n",
1041 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: message processed\n");
1042 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1043 GNUNET_TIME_UNIT_FOREVER_REL);
1047 /******************************************************************************/
1048 /************************ SEND FUNCTIONS ****************************/
1049 /******************************************************************************/
1052 * Function called to send a message to the service.
1053 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1056 * @param cls closure, the mesh handle
1057 * @param size number of bytes available in buf
1058 * @param buf where the callee should write the connect message
1059 * @return number of bytes written to buf
1062 send_callback (void *cls, size_t size, void *buf)
1064 struct GNUNET_MESH_Handle *h = cls;
1065 struct GNUNET_MESH_TransmitHandle *th;
1070 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() Buffer %u\n", size);
1072 if ((0 == size) || (NULL == buf))
1078 while ((NULL != (th = h->th_head)) && (size >= th->size))
1080 if (NULL != th->notify)
1082 if (th->tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1084 /* traffic to origin */
1085 struct GNUNET_MESH_ToOrigin to;
1086 struct GNUNET_MessageHeader *mh;
1088 GNUNET_assert (size >= th->size);
1089 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (to)];
1090 psize = th->notify (th->notify_cls, size - sizeof (to), mh);
1091 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: to origin, type %u\n",
1095 psize += sizeof (to);
1096 GNUNET_assert (size >= psize);
1097 to.header.size = htons (psize);
1098 to.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_TO_ORIGIN);
1099 to.tid = htonl (th->tunnel->tid);
1100 memset (&to.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1101 memset (&to.sender, 0, sizeof (struct GNUNET_PeerIdentity));
1102 memcpy (cbuf, &to, sizeof (to));
1105 else if (th->target == 0)
1108 struct GNUNET_MESH_Multicast mc;
1109 struct GNUNET_MessageHeader *mh;
1111 GNUNET_assert (size >= th->size);
1112 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (mc)];
1113 psize = th->notify (th->notify_cls, size - sizeof (mc), mh);
1114 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: multicast, type %u\n",
1118 psize += sizeof (mc);
1119 GNUNET_assert (size >= psize);
1120 mc.header.size = htons (psize);
1121 mc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_MULTICAST);
1122 mc.tid = htonl (th->tunnel->tid);
1125 memset (&mc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1126 memcpy (cbuf, &mc, sizeof (mc));
1132 struct GNUNET_MESH_Unicast uc;
1133 struct GNUNET_MessageHeader *mh;
1135 GNUNET_assert (size >= th->size);
1136 mh = (struct GNUNET_MessageHeader *) &cbuf[sizeof (uc)];
1137 psize = th->notify (th->notify_cls, size - sizeof (uc), mh);
1138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unicast, type %u\n",
1142 psize += sizeof (uc);
1143 GNUNET_assert (size >= psize);
1144 uc.header.size = htons (psize);
1145 uc.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_UNICAST);
1146 uc.tid = htonl (th->tunnel->tid);
1147 memset (&uc.oid, 0, sizeof (struct GNUNET_PeerIdentity));
1148 GNUNET_PEER_resolve (th->target, &uc.destination);
1149 memcpy (cbuf, &uc, sizeof (uc));
1155 memcpy (cbuf, &th[1], th->size);
1158 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1159 GNUNET_SCHEDULER_cancel (th->timeout_task);
1160 if (NULL != th->notify)
1162 th->tunnel->mesh->npackets--;
1163 th->tunnel->npackets--;
1165 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1171 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: total size: %u\n", tsize);
1172 if (NULL != (th = h->th_head))
1174 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: next size: %u\n", th->size);
1177 GNUNET_CLIENT_notify_transmit_ready (h->client, th->size,
1178 GNUNET_TIME_UNIT_FOREVER_REL,
1179 GNUNET_YES, &send_callback, h);
1181 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Send packet() END\n");
1182 if (GNUNET_NO == h->in_receive)
1184 h->in_receive = GNUNET_YES;
1185 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1186 GNUNET_TIME_UNIT_FOREVER_REL);
1193 * Auxiliary function to send an already constructed packet to the service.
1194 * Takes care of creating a new queue element, copying the message and
1195 * calling the tmt_rdy function if necessary.
1197 * @param h mesh handle
1198 * @param msg message to transmit
1199 * @param tunnel tunnel this send is related to (NULL if N/A)
1202 send_packet (struct GNUNET_MESH_Handle *h,
1203 const struct GNUNET_MessageHeader *msg,
1204 struct GNUNET_MESH_Tunnel *tunnel)
1206 struct GNUNET_MESH_TransmitHandle *th;
1209 msize = ntohs (msg->size);
1210 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1211 th->priority = UINT32_MAX;
1212 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1214 th->tunnel = tunnel;
1215 memcpy (&th[1], msg, msize);
1216 add_to_queue (h, th);
1220 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1221 GNUNET_TIME_UNIT_FOREVER_REL,
1222 GNUNET_YES, &send_callback, h);
1226 /******************************************************************************/
1227 /********************** API CALL DEFINITIONS *************************/
1228 /******************************************************************************/
1231 * Connect to the mesh service.
1233 * @param cfg configuration to use
1234 * @param queue_size size of the data message queue, shared among all tunnels
1235 * (each tunnel is guaranteed to accept at least one message,
1236 * no matter what is the status of other tunnels)
1237 * @param cls closure for the various callbacks that follow
1238 * (including handlers in the handlers array)
1239 * @param new_tunnel function called when an *inbound* tunnel is created
1240 * @param cleaner function called when an *inbound* tunnel is destroyed by the
1241 * remote peer, it is *not* called if GNUNET_MESH_tunnel_destroy
1242 * is called on the tunnel
1243 * @param handlers callbacks for messages we care about, NULL-terminated
1244 * note that the mesh is allowed to drop notifications about
1245 * inbound messages if the client does not process them fast
1246 * enough (for this notification type, a bounded queue is used)
1247 * @param stypes list of the applications that this client claims to provide
1248 * @return handle to the mesh service NULL on error
1249 * (in this case, init is never called)
1251 struct GNUNET_MESH_Handle *
1252 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1253 unsigned int queue_size, void *cls,
1254 GNUNET_MESH_InboundTunnelNotificationHandler new_tunnel,
1255 GNUNET_MESH_TunnelEndHandler cleaner,
1256 const struct GNUNET_MESH_MessageHandler *handlers,
1257 const GNUNET_MESH_ApplicationType *stypes)
1259 struct GNUNET_MESH_Handle *h;
1261 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect()\n");
1262 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1264 h->max_queue_size = queue_size;
1265 h->new_tunnel = new_tunnel;
1266 h->cleaner = cleaner;
1267 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1268 if (h->client == NULL)
1276 h->applications = stypes;
1277 h->message_handlers = handlers;
1278 h->next_tid = GNUNET_MESH_LOCAL_TUNNEL_ID_CLI;
1279 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1281 /* count handlers and apps, calculate size */
1282 for (h->n_applications = 0; stypes[h->n_applications]; h->n_applications++) ;
1283 for (h->n_handlers = 0; handlers[h->n_handlers].type; h->n_handlers++) ;
1285 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: GNUNET_MESH_connect() END\n");
1291 * Disconnect from the mesh service. All tunnels will be destroyed. All tunnel
1292 * disconnect callbacks will be called on any still connected peers, notifying
1293 * about their disconnection. The registered inbound tunnel cleaner will be
1294 * called should any inbound tunnels still exist.
1296 * @param handle connection to mesh to disconnect
1299 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1301 struct GNUNET_MESH_Tunnel *t;
1302 struct GNUNET_MESH_Tunnel *aux;
1303 struct GNUNET_MESH_TransmitHandle *th;
1305 t = handle->tunnels_head;
1309 if (t->tid < GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1313 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: tunnel %X not destroyed\n",
1317 destroy_tunnel (t, GNUNET_YES);
1320 while ( (th = handle->th_head) != NULL)
1322 struct GNUNET_MessageHeader *msg;
1324 /* Make sure it is an allowed packet (everything else should have been
1325 * already canceled).
1327 GNUNET_break (UINT32_MAX == th->priority);
1328 GNUNET_break (NULL == th->notify);
1329 msg = (struct GNUNET_MessageHeader *) &th[1];
1330 switch (ntohs(msg->type))
1332 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1333 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY:
1338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: unexpected msg %u\n",
1343 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1347 if (NULL != handle->th)
1349 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1352 if (NULL != handle->client)
1354 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1355 handle->client = NULL;
1357 GNUNET_free (handle);
1362 * Create a new tunnel (we're initiator and will be allowed to add/remove peers
1363 * and to broadcast).
1365 * @param h mesh handle
1366 * @param tunnel_ctx client's tunnel context to associate with the tunnel
1367 * @param connect_handler function to call when peers are actually connected
1368 * @param disconnect_handler function to call when peers are disconnected
1369 * @param handler_cls closure for connect/disconnect handlers
1371 struct GNUNET_MESH_Tunnel *
1372 GNUNET_MESH_tunnel_create (struct GNUNET_MESH_Handle *h, void *tunnel_ctx,
1373 GNUNET_MESH_PeerConnectHandler connect_handler,
1374 GNUNET_MESH_PeerDisconnectHandler disconnect_handler,
1377 struct GNUNET_MESH_Tunnel *t;
1378 struct GNUNET_MESH_TunnelMessage msg;
1380 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Creating new tunnel\n");
1381 t = create_tunnel (h, 0);
1382 t->connect_handler = connect_handler;
1383 t->disconnect_handler = disconnect_handler;
1384 t->cls = handler_cls;
1385 t->ctx = tunnel_ctx;
1386 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_CREATE);
1387 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1388 msg.tunnel_id = htonl (t->tid);
1389 send_packet (h, &msg.header, t);
1395 * Destroy an existing tunnel. The existing callback for the tunnel will NOT
1398 * @param tunnel tunnel handle
1401 GNUNET_MESH_tunnel_destroy (struct GNUNET_MESH_Tunnel *tunnel)
1403 struct GNUNET_MESH_Handle *h;
1404 struct GNUNET_MESH_TunnelMessage msg;
1405 struct GNUNET_MESH_TransmitHandle *th;
1407 LOG (GNUNET_ERROR_TYPE_DEBUG, "mesh: Destroying tunnel\n");
1410 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_TUNNEL_DESTROY);
1411 msg.header.size = htons (sizeof (struct GNUNET_MESH_TunnelMessage));
1412 msg.tunnel_id = htonl (tunnel->tid);
1416 struct GNUNET_MESH_TransmitHandle *aux;
1417 if (th->tunnel == tunnel)
1420 /* FIXME call the handler? */
1421 if (NULL != th->notify)
1422 th->notify (th->notify_cls, 0, NULL);
1423 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1431 destroy_tunnel (tunnel, GNUNET_NO);
1432 send_packet (h, &msg.header, tunnel);
1437 * Request that a peer should be added to the tunnel. The existing
1438 * connect handler will be called ONCE with either success or failure.
1439 * This function should NOT be called again with the same peer before the
1440 * connect handler is called.
1442 * @param tunnel handle to existing tunnel
1443 * @param peer peer to add
1446 GNUNET_MESH_peer_request_connect_add (struct GNUNET_MESH_Tunnel *tunnel,
1447 const struct GNUNET_PeerIdentity *peer)
1449 struct GNUNET_MESH_PeerControl msg;
1450 GNUNET_PEER_Id peer_id;
1453 peer_id = GNUNET_PEER_intern (peer);
1454 for (i = 0; i < tunnel->npeers; i++)
1456 if (tunnel->peers[i]->id == peer_id)
1458 /* Peer already exists in tunnel */
1459 GNUNET_PEER_change_rc (peer_id, -1);
1464 if (NULL == add_peer_to_tunnel (tunnel, peer))
1467 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1468 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD);
1469 msg.tunnel_id = htonl (tunnel->tid);
1471 send_packet (tunnel->mesh, &msg.header, tunnel);
1478 * Request that a peer should be removed from the tunnel. The existing
1479 * disconnect handler will be called ONCE if we were connected.
1481 * @param tunnel handle to existing tunnel
1482 * @param peer peer to remove
1485 GNUNET_MESH_peer_request_connect_del (struct GNUNET_MESH_Tunnel *tunnel,
1486 const struct GNUNET_PeerIdentity *peer)
1488 struct GNUNET_MESH_PeerControl msg;
1489 GNUNET_PEER_Id peer_id;
1492 peer_id = GNUNET_PEER_search (peer);
1498 for (i = 0; i < tunnel->npeers; i++)
1499 if (tunnel->peers[i]->id == peer_id)
1501 if (i == tunnel->npeers)
1506 if (NULL != tunnel->disconnect_handler && tunnel->peers[i]->connected == 1)
1507 tunnel->disconnect_handler (tunnel->cls, peer);
1508 GNUNET_PEER_change_rc (peer_id, -1);
1509 GNUNET_free (tunnel->peers[i]);
1510 tunnel->peers[i] = tunnel->peers[tunnel->npeers - 1];
1511 GNUNET_array_grow (tunnel->peers, tunnel->npeers, tunnel->npeers - 1);
1513 msg.header.size = htons (sizeof (struct GNUNET_MESH_PeerControl));
1514 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_DEL);
1515 msg.tunnel_id = htonl (tunnel->tid);
1516 memcpy (&msg.peer, peer, sizeof (struct GNUNET_PeerIdentity));
1517 send_packet (tunnel->mesh, &msg.header, tunnel);
1522 * Request that the mesh should try to connect to a peer supporting the given
1525 * @param tunnel handle to existing tunnel
1526 * @param app_type application type that must be supported by the peer (MESH
1527 * should discover peer in proximity handling this type)
1530 GNUNET_MESH_peer_request_connect_by_type (struct GNUNET_MESH_Tunnel *tunnel,
1531 GNUNET_MESH_ApplicationType app_type)
1533 struct GNUNET_MESH_ConnectPeerByType msg;
1535 GNUNET_array_append (tunnel->apps, tunnel->napps, app_type);
1537 msg.header.size = htons (sizeof (struct GNUNET_MESH_ConnectPeerByType));
1538 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_PEER_ADD_BY_TYPE);
1539 msg.tunnel_id = htonl (tunnel->tid);
1540 msg.type = htonl (app_type);
1541 send_packet (tunnel->mesh, &msg.header, tunnel);
1546 * Ask the mesh to call "notify" once it is ready to transmit the
1547 * given number of bytes to the specified "target". If we are not yet
1548 * connected to the specified peer, a call to this function will cause
1549 * us to try to establish a connection.
1551 * @param tunnel tunnel to use for transmission
1552 * @param cork is corking allowed for this transmission?
1553 * @param priority how important is the message?
1554 * @param maxdelay how long can the message wait?
1555 * @param target destination for the message,
1556 * NULL for multicast to all tunnel targets
1557 * @param notify_size how many bytes of buffer space does notify want?
1558 * @param notify function to call when buffer space is available;
1559 * will be called with NULL on timeout or if the overall queue
1560 * for this peer is larger than queue_size and this is currently
1561 * the message with the lowest priority
1562 * @param notify_cls closure for notify
1563 * @return non-NULL if the notify callback was queued,
1564 * NULL if we can not even queue the request (insufficient
1565 * memory); if NULL is returned, "notify" will NOT be called.
1567 struct GNUNET_MESH_TransmitHandle *
1568 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Tunnel *tunnel, int cork,
1570 struct GNUNET_TIME_Relative maxdelay,
1571 const struct GNUNET_PeerIdentity *target,
1573 GNUNET_CONNECTION_TransmitReadyNotify notify,
1576 struct GNUNET_MESH_TransmitHandle *th;
1577 struct GNUNET_MESH_TransmitHandle *least_priority_th;
1578 uint32_t least_priority;
1581 GNUNET_assert (NULL != tunnel);
1583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1584 "mesh: mesh notify transmit ready called\n");
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target %s\n",
1587 GNUNET_i2s (target));
1589 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "mesh: target multicast\n");
1591 GNUNET_assert (NULL != notify);
1592 if (tunnel->mesh->npackets >= tunnel->mesh->max_queue_size &&
1593 tunnel->npackets > 0)
1598 th = tunnel->mesh->th_tail;
1599 least_priority = priority;
1600 least_priority_th = NULL;
1603 if (th->priority < least_priority && th->tunnel->npackets > 1)
1605 least_priority_th = th;
1606 least_priority = th->priority;
1610 if (NULL == least_priority_th)
1612 /* Can't be a control message */
1613 GNUNET_assert (NULL != least_priority_th->notify);
1614 least_priority_th->notify (notify_cls, 0, NULL);
1615 least_priority_th->tunnel->npackets--;
1616 tunnel->mesh->npackets--;
1617 GNUNET_CONTAINER_DLL_remove (tunnel->mesh->th_head, tunnel->mesh->th_tail,
1619 if (GNUNET_SCHEDULER_NO_TASK != least_priority_th->timeout_task)
1620 GNUNET_SCHEDULER_cancel (least_priority_th->timeout_task);
1621 GNUNET_free (least_priority_th);
1624 tunnel->mesh->npackets++;
1625 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1626 th->tunnel = tunnel;
1627 th->priority = priority;
1628 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1629 th->target = GNUNET_PEER_intern (target);
1630 if (tunnel->tid >= GNUNET_MESH_LOCAL_TUNNEL_ID_SERV)
1631 overhead = sizeof (struct GNUNET_MESH_ToOrigin);
1632 else if (NULL == target)
1633 overhead = sizeof (struct GNUNET_MESH_Multicast);
1635 overhead = sizeof (struct GNUNET_MESH_Unicast);
1636 th->size = notify_size + overhead;
1637 th->notify = notify;
1638 th->notify_cls = notify_cls;
1639 add_to_queue (tunnel->mesh, th);
1640 if (NULL != tunnel->mesh->th)
1643 GNUNET_CLIENT_notify_transmit_ready (tunnel->mesh->client, th->size,
1644 GNUNET_TIME_UNIT_FOREVER_REL,
1645 GNUNET_YES, &send_callback,
1652 * Cancel the specified transmission-ready notification.
1654 * @param th handle that was returned by "notify_transmit_ready".
1657 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1659 struct GNUNET_MESH_Handle *mesh;
1661 mesh = th->tunnel->mesh;
1662 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1663 GNUNET_SCHEDULER_cancel (th->timeout_task);
1664 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1666 if ((NULL == mesh->th_head) && (NULL != mesh->th))
1668 /* queue empty, no point in asking for transmission */
1669 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1676 * Transition API for tunnel ctx management
1679 GNUNET_MESH_tunnel_set_data (struct GNUNET_MESH_Tunnel *tunnel, void *data)
1685 * Transition API for tunnel ctx management
1688 GNUNET_MESH_tunnel_get_data (struct GNUNET_MESH_Tunnel *tunnel)
1694 #if 0 /* keep Emacsens' auto-indent happy */