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3 (C) 2011 Christian Grothoff (and other contributing authors)
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19 * @file mesh/mesh_api.c
20 * @brief mesh api: client implementation of new mesh service
21 * @author Bartlomiej Polot
25 #include "gnunet_util_lib.h"
26 #include "gnunet_mesh_service.h"
28 #include "mesh_protocol.h"
30 #define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
32 /******************************************************************************/
33 /************************ DATA STRUCTURES ****************************/
34 /******************************************************************************/
37 * Transmission queue to the service
39 struct GNUNET_MESH_TransmitHandle
45 struct GNUNET_MESH_TransmitHandle *next;
50 struct GNUNET_MESH_TransmitHandle *prev;
53 * Channel this message is sent on / for (may be NULL for control messages).
55 struct GNUNET_MESH_Channel *channel;
58 * Callback to obtain the message to transmit, or NULL if we
59 * got the message in 'data'. Notice that messages built
60 * by 'notify' need to be encapsulated with information about
63 GNUNET_CONNECTION_TransmitReadyNotify notify;
66 * Closure for 'notify'
71 * How long is this message valid. Once the timeout has been
72 * reached, the message must no longer be sent. If this
73 * is a message with a 'notify' callback set, the 'notify'
74 * function should be called with 'buf' NULL and size 0.
76 struct GNUNET_TIME_Absolute timeout;
79 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
81 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
84 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
91 * Opaque handle to the service.
93 struct GNUNET_MESH_Handle
97 * Handle to the server connection, to send messages later
99 struct GNUNET_CLIENT_Connection *client;
102 * Set of handlers used for processing incoming messages in the channels
104 const struct GNUNET_MESH_MessageHandler *message_handlers;
107 * Number of handlers in the handlers array.
109 unsigned int n_handlers;
114 const uint32_t *ports;
119 unsigned int n_ports;
122 * Double linked list of the channels this client is connected to, head.
124 struct GNUNET_MESH_Channel *channels_head;
127 * Double linked list of the channels this client is connected to, tail.
129 struct GNUNET_MESH_Channel *channels_tail;
132 * Callback for inbound channel creation
134 GNUNET_MESH_InboundChannelNotificationHandler *new_channel;
137 * Callback for inbound channel disconnection
139 GNUNET_MESH_ChannelEndHandler *cleaner;
142 * Handle to cancel pending transmissions in case of disconnection
144 struct GNUNET_CLIENT_TransmitHandle *th;
147 * Closure for all the handlers given by the client
152 * Messages to send to the service, head.
154 struct GNUNET_MESH_TransmitHandle *th_head;
157 * Messages to send to the service, tail.
159 struct GNUNET_MESH_TransmitHandle *th_tail;
162 * chid of the next channel to create (to avoid reusing IDs often)
164 MESH_ChannelNumber next_chid;
167 * Have we started the task to receive messages from the service
168 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
173 * Configuration given by the client, in case of reconnection
175 const struct GNUNET_CONFIGURATION_Handle *cfg;
178 * Time to the next reconnect in case one reconnect fails
180 struct GNUNET_TIME_Relative reconnect_time;
183 * Task for trying to reconnect.
185 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
190 GNUNET_MESH_ChannelsCB channels_cb;
193 * Monitor callback closure.
200 GNUNET_MESH_ChannelCB channel_cb;
203 * Channel callback closure.
210 * Description of a peer
212 struct GNUNET_MESH_Peer
215 * ID of the peer in short form
220 * Channel this peer belongs to
222 struct GNUNET_MESH_Channel *t;
225 * Flag indicating whether service has informed about its connection
226 * FIXME-BART: is this flag used? Seems dead right now...
234 * Opaque handle to a channel.
236 struct GNUNET_MESH_Channel
242 struct GNUNET_MESH_Channel *next;
247 struct GNUNET_MESH_Channel *prev;
250 * Handle to the mesh this channel belongs to
252 struct GNUNET_MESH_Handle *mesh;
255 * Local ID of the channel
257 MESH_ChannelNumber chid;
265 * Other end of the channel.
270 * Any data the caller wants to put in here
275 * Size of packet queued in this channel
277 unsigned int packet_size;
280 * Channel options: reliability, etc.
282 enum MeshOption options;
285 * Are we allowed to send to the service?
293 * Implementation state for mesh's message queue.
298 * The current transmit handle, or NULL
299 * if no transmit is active.
301 struct GNUNET_MESH_TransmitHandle *th;
304 * Channel to send the data over.
306 struct GNUNET_MESH_Channel *channel;
310 /******************************************************************************/
311 /*********************** DECLARATIONS *************************/
312 /******************************************************************************/
315 * Function called to send a message to the service.
316 * "buf" will be NULL and "size" zero if the socket was closed for writing in
319 * @param cls closure, the mesh handle
320 * @param size number of bytes available in buf
321 * @param buf where the callee should write the connect message
322 * @return number of bytes written to buf
325 send_callback (void *cls, size_t size, void *buf);
328 /******************************************************************************/
329 /*********************** AUXILIARY FUNCTIONS *************************/
330 /******************************************************************************/
333 * Check if transmission is a payload packet.
335 * @param th Transmission handle.
337 * @return GNUNET_YES if it is a payload packet,
338 * GNUNET_NO if it is a mesh management packet.
341 th_is_payload (struct GNUNET_MESH_TransmitHandle *th)
343 return (th->notify != NULL) ? GNUNET_YES : GNUNET_NO;
348 * Check whether there is any message ready in the queue and find the size.
350 * @param h Mesh handle.
352 * @return The size of the first ready message in the queue,
353 * 0 if there is none.
356 message_ready_size (struct GNUNET_MESH_Handle *h)
358 struct GNUNET_MESH_TransmitHandle *th;
359 struct GNUNET_MESH_Channel *ch;
361 for (th = h->th_head; NULL != th; th = th->next)
364 if (GNUNET_NO == th_is_payload (th))
366 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message internal\n");
369 if (GNUNET_YES == ch->allow_send)
371 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message payload ok\n");
380 * Get the channel handler for the channel specified by id from the given handle
381 * @param h Mesh handle
382 * @param chid ID of the wanted channel
383 * @return handle to the required channel or NULL if not found
385 static struct GNUNET_MESH_Channel *
386 retrieve_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
388 struct GNUNET_MESH_Channel *ch;
390 ch = h->channels_head;
393 if (ch->chid == chid)
402 * Create a new channel and insert it in the channel list of the mesh handle
404 * @param h Mesh handle
405 * @param chid Desired chid of the channel, 0 to assign one automatically.
407 * @return Handle to the created channel.
409 static struct GNUNET_MESH_Channel *
410 create_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
412 struct GNUNET_MESH_Channel *ch;
414 ch = GNUNET_malloc (sizeof (struct GNUNET_MESH_Channel));
415 GNUNET_CONTAINER_DLL_insert (h->channels_head, h->channels_tail, ch);
419 ch->chid = h->next_chid;
420 while (NULL != retrieve_channel (h, h->next_chid))
423 h->next_chid &= ~GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
424 h->next_chid |= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
431 ch->allow_send = GNUNET_NO;
437 * Destroy the specified channel.
438 * - Destroys all peers, calling the disconnect callback on each if needed
439 * - Cancels all outgoing traffic for that channel, calling respective notifys
440 * - Calls cleaner if channel was inbound
441 * - Frees all memory used
443 * @param ch Pointer to the channel.
444 * @param call_cleaner Whether to call the cleaner handler.
446 * @return Handle to the required channel or NULL if not found.
449 destroy_channel (struct GNUNET_MESH_Channel *ch, int call_cleaner)
451 struct GNUNET_MESH_Handle *h;
452 struct GNUNET_MESH_TransmitHandle *th;
453 struct GNUNET_MESH_TransmitHandle *next;
455 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy_channel %X\n", ch->chid);
464 GNUNET_CONTAINER_DLL_remove (h->channels_head, h->channels_tail, ch);
466 /* signal channel destruction */
467 if ( (NULL != h->cleaner) && (0 != ch->peer) && (GNUNET_YES == call_cleaner) )
469 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cleaner\n");
470 h->cleaner (h->cls, ch, ch->ctx);
473 /* check that clients did not leave messages behind in the queue */
474 for (th = h->th_head; NULL != th; th = next)
477 if (th->channel != ch)
479 /* Clients should have aborted their requests already.
480 * Management traffic should be ok, as clients can't cancel that.
481 * If the service crashed and we are reconnecting, it's ok.
483 GNUNET_break (GNUNET_NO == th_is_payload (th)
484 || GNUNET_NO == h->in_receive);
485 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
487 /* clean up request */
488 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
489 GNUNET_SCHEDULER_cancel (th->timeout_task);
493 /* if there are no more pending requests with mesh service, cancel active request */
494 /* Note: this should be unnecessary... */
495 if ((0 == message_ready_size (h)) && (NULL != h->th))
497 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
502 GNUNET_PEER_change_rc (ch->peer, -1);
509 * Notify client that the transmission has timed out
512 * @param tc task context
515 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
517 struct GNUNET_MESH_TransmitHandle *th = cls;
518 struct GNUNET_MESH_Handle *mesh;
520 mesh = th->channel->mesh;
521 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
522 th->channel->packet_size = 0;
523 if (GNUNET_YES == th_is_payload (th))
524 th->notify (th->notify_cls, 0, NULL);
526 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
528 /* nothing ready to transmit, no point in asking for transmission */
529 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
536 * Add a transmit handle to the transmission queue and set the
539 * @param h mesh handle with the queue head and tail
540 * @param th handle to the packet to be transmitted
543 add_to_queue (struct GNUNET_MESH_Handle *h,
544 struct GNUNET_MESH_TransmitHandle *th)
546 GNUNET_CONTAINER_DLL_insert_tail (h->th_head, h->th_tail, th);
547 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == th->timeout.abs_value_us)
550 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
551 (th->timeout), &timeout_transmission, th);
556 * Auxiliary function to send an already constructed packet to the service.
557 * Takes care of creating a new queue element, copying the message and
558 * calling the tmt_rdy function if necessary.
560 * @param h mesh handle
561 * @param msg message to transmit
562 * @param channel channel this send is related to (NULL if N/A)
565 send_packet (struct GNUNET_MESH_Handle *h,
566 const struct GNUNET_MessageHeader *msg,
567 struct GNUNET_MESH_Channel *channel);
571 * Send an ack on the channel to confirm the processing of a message.
573 * @param ch Channel on which to send the ACK.
576 send_ack (struct GNUNET_MESH_Channel *ch)
578 struct GNUNET_MESH_LocalAck msg;
580 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK on channel %X\n", ch->chid);
581 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
582 msg.header.size = htons (sizeof (msg));
583 msg.channel_id = htonl (ch->chid);
585 send_packet (ch->mesh, &msg.header, ch);
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_ports * sizeof (uint32_t);
616 char buf[size] GNUNET_ALIGN;
617 struct GNUNET_MESH_ClientConnect *msg;
621 /* build connection packet */
622 msg = (struct GNUNET_MESH_ClientConnect *) buf;
623 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
624 msg->header.size = htons (size);
625 ports = (uint32_t *) &msg[1];
626 for (i = 0; i < h->n_ports; i++)
628 ports[i] = htonl (h->ports[i]);
629 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n",
632 LOG (GNUNET_ERROR_TYPE_DEBUG,
633 "Sending %lu bytes long message with %u ports\n",
634 ntohs (msg->header.size), h->n_ports);
635 send_packet (h, &msg->header, NULL);
641 * Reconnect to the service, retransmit all infomation to try to restore the
644 * @param h handle to the mesh
646 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
649 do_reconnect (struct GNUNET_MESH_Handle *h)
651 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
652 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
653 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
654 LOG (GNUNET_ERROR_TYPE_DEBUG, "******** on %p *******\n", h);
655 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
660 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
663 if (NULL != h->client)
665 GNUNET_CLIENT_disconnect (h->client);
669 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
670 if (h->client == NULL)
672 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
675 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
676 GNUNET_TIME_relative_multiply
677 (h->reconnect_time, 2));
678 LOG (GNUNET_ERROR_TYPE_DEBUG, "Next retry in %s\n",
679 GNUNET_STRINGS_relative_time_to_string (h->reconnect_time,
686 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
693 * Reconnect callback: tries to reconnect again after a failer previous
695 * @param cls closure (mesh handle)
696 * @param tc task context
699 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
701 struct GNUNET_MESH_Handle *h = cls;
703 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
704 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
711 * Reconnect to the service, retransmit all infomation to try to restore the
714 * @param h handle to the mesh
716 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
719 reconnect (struct GNUNET_MESH_Handle *h)
721 struct GNUNET_MESH_Channel *ch;
722 struct GNUNET_MESH_Channel *next;
724 LOG (GNUNET_ERROR_TYPE_DEBUG,
725 "Requested RECONNECT, destroying all channels\n");
726 h->in_receive = GNUNET_NO;
727 for (ch = h->channels_head; NULL != ch; ch = next)
730 destroy_channel (ch, GNUNET_YES);
732 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
733 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
738 /******************************************************************************/
739 /*********************** RECEIVE HANDLERS ****************************/
740 /******************************************************************************/
743 * Process the new channel notification and add it to the channels in the handle
745 * @param h The mesh handle
746 * @param msg A message with the details of the new incoming channel
749 process_channel_created (struct GNUNET_MESH_Handle *h,
750 const struct GNUNET_MESH_ChannelMessage *msg)
752 struct GNUNET_MESH_Channel *ch;
753 MESH_ChannelNumber chid;
756 chid = ntohl (msg->channel_id);
757 port = ntohl (msg->port);
758 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating incoming channel %X:%u\n", chid, port);
759 if (chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
764 if (NULL != h->new_channel)
768 ch = create_channel (h, chid);
769 ch->allow_send = GNUNET_NO;
770 ch->peer = GNUNET_PEER_intern (&msg->peer);
774 ch->options = ntohl (msg->opt);
776 LOG (GNUNET_ERROR_TYPE_DEBUG, " created channel %p\n", ch);
777 ctx = h->new_channel (h->cls, ch, &msg->peer, ch->port, ch->options);
780 LOG (GNUNET_ERROR_TYPE_DEBUG, "User notified\n");
784 struct GNUNET_MESH_ChannelMessage d_msg;
786 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming channels\n");
788 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
789 d_msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
790 d_msg.channel_id = msg->channel_id;
791 memset (&d_msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
795 send_packet (h, &d_msg.header, NULL);
802 * Process the channel destroy notification and free associated resources
804 * @param h The mesh handle
805 * @param msg A message with the details of the channel being destroyed
808 process_channel_destroy (struct GNUNET_MESH_Handle *h,
809 const struct GNUNET_MESH_ChannelMessage *msg)
811 struct GNUNET_MESH_Channel *ch;
812 MESH_ChannelNumber chid;
814 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel Destroy received from service\n");
815 chid = ntohl (msg->channel_id);
816 ch = retrieve_channel (h, chid);
820 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X unknown\n", chid);
823 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroying channel %X\n", ch->chid);
824 destroy_channel (ch, GNUNET_YES);
829 * Process the incoming data packets, call appropriate handlers.
831 * @param h The mesh handle
832 * @param message A message encapsulating the data
835 process_incoming_data (struct GNUNET_MESH_Handle *h,
836 const struct GNUNET_MessageHeader *message)
838 const struct GNUNET_MessageHeader *payload;
839 const struct GNUNET_MESH_MessageHandler *handler;
840 struct GNUNET_MESH_LocalData *dmsg;
841 struct GNUNET_MESH_Channel *ch;
845 LOG (GNUNET_ERROR_TYPE_DEBUG,
846 "Got a data message!\n");
847 dmsg = (struct GNUNET_MESH_LocalData *) message;
848 ch = retrieve_channel (h, ntohl (dmsg->id));
849 payload = (struct GNUNET_MessageHeader *) &dmsg[1];
850 LOG (GNUNET_ERROR_TYPE_DEBUG,
851 " %s data on channel %s [%X]\n",
852 ch->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ? "fwd" : "bck",
853 GNUNET_i2s (GNUNET_PEER_resolve2 (ch->peer)), ntohl (dmsg->id));
856 /* Channel was ignored/destroyed, probably service didn't get it yet */
857 LOG (GNUNET_ERROR_TYPE_DEBUG, " ignored!\n");
860 type = ntohs (payload->type);
861 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload type %u\n", type);
862 for (i = 0; i < h->n_handlers; i++)
864 handler = &h->message_handlers[i];
865 LOG (GNUNET_ERROR_TYPE_DEBUG,
866 " checking handler for type %u\n",
868 if (handler->type == type)
871 handler->callback (h->cls, ch, &ch->ctx, payload))
873 LOG (GNUNET_ERROR_TYPE_DEBUG, "callback caused disconnection\n");
874 GNUNET_MESH_channel_destroy (ch);
879 LOG (GNUNET_ERROR_TYPE_DEBUG,
880 "callback completed successfully\n");
889 * Process a local ACK message, enabling the client to send
890 * more data to the service.
892 * @param h Mesh handle.
893 * @param message Message itself.
896 process_ack (struct GNUNET_MESH_Handle *h,
897 const struct GNUNET_MessageHeader *message)
899 struct GNUNET_MESH_LocalAck *msg;
900 struct GNUNET_MESH_Channel *ch;
901 MESH_ChannelNumber chid;
903 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK!\n");
904 msg = (struct GNUNET_MESH_LocalAck *) message;
905 chid = ntohl (msg->channel_id);
906 ch = retrieve_channel (h, chid);
909 LOG (GNUNET_ERROR_TYPE_WARNING, "ACK on unknown channel %X\n", chid);
912 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X!\n", ch->chid);
913 ch->allow_send = GNUNET_YES;
914 if (NULL == h->th && 0 < ch->packet_size)
916 LOG (GNUNET_ERROR_TYPE_DEBUG, " tmt rdy was NULL, requesting!\n");
918 GNUNET_CLIENT_notify_transmit_ready (h->client, ch->packet_size,
919 GNUNET_TIME_UNIT_FOREVER_REL,
920 GNUNET_YES, &send_callback, h);
926 * Process a local reply about info on all channels, pass info to the user.
928 * @param h Mesh handle.
929 * @param message Message itself.
932 // process_get_channels (struct GNUNET_MESH_Handle *h,
933 // const struct GNUNET_MessageHeader *message)
935 // struct GNUNET_MESH_LocalMonitor *msg;
937 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get Channels messasge received\n");
939 // if (NULL == h->channels_cb)
941 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
945 // msg = (struct GNUNET_MESH_LocalMonitor *) message;
946 // if (ntohs (message->size) !=
947 // (sizeof (struct GNUNET_MESH_LocalMonitor) +
948 // sizeof (struct GNUNET_PeerIdentity)))
950 // GNUNET_break_op (0);
951 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
952 // "Get channels message: size %hu - expected %u\n",
953 // ntohs (message->size),
954 // sizeof (struct GNUNET_MESH_LocalMonitor));
957 // h->channels_cb (h->channels_cls,
958 // ntohl (msg->channel_id),
960 // &msg->destination);
966 * Process a local monitor_channel reply, pass info to the user.
968 * @param h Mesh handle.
969 * @param message Message itself.
972 // process_show_channel (struct GNUNET_MESH_Handle *h,
973 // const struct GNUNET_MessageHeader *message)
975 // struct GNUNET_MESH_LocalMonitor *msg;
978 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show Channel messasge received\n");
980 // if (NULL == h->channel_cb)
982 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
986 // /* Verify message sanity */
987 // msg = (struct GNUNET_MESH_LocalMonitor *) message;
988 // esize = sizeof (struct GNUNET_MESH_LocalMonitor);
989 // if (ntohs (message->size) != esize)
991 // GNUNET_break_op (0);
992 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
993 // "Show channel message: size %hu - expected %u\n",
994 // ntohs (message->size),
997 // h->channel_cb (h->channel_cls, NULL, NULL);
998 // h->channel_cb = NULL;
999 // h->channel_cls = NULL;
1004 // h->channel_cb (h->channel_cls,
1005 // &msg->destination,
1011 * Function to process all messages received from the service
1013 * @param cls closure
1014 * @param msg message received, NULL on timeout or fatal error
1017 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1019 struct GNUNET_MESH_Handle *h = cls;
1024 LOG (GNUNET_ERROR_TYPE_DEBUG,
1025 "Mesh service disconnected, reconnecting\n", h);
1029 type = ntohs (msg->type);
1030 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1031 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a message: %s\n",
1035 /* Notify of a new incoming channel */
1036 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1037 process_channel_created (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1039 /* Notify of a channel disconnection */
1040 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: /* TODO separate(gid problem)*/
1041 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_NACK:
1042 process_channel_destroy (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1044 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA:
1045 process_incoming_data (h, msg);
1047 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
1048 process_ack (h, msg);
1050 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS: DEPRECATED
1051 // process_get_channels (h, msg);
1053 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL: DEPRECATED
1054 // process_show_channel (h, msg);
1057 /* We shouldn't get any other packages, log and ignore */
1058 LOG (GNUNET_ERROR_TYPE_WARNING,
1059 "unsolicited message form service (type %s)\n",
1060 GM_m2s (ntohs (msg->type)));
1062 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1063 if (GNUNET_YES == h->in_receive)
1065 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1066 GNUNET_TIME_UNIT_FOREVER_REL);
1070 LOG (GNUNET_ERROR_TYPE_DEBUG,
1071 "in receive off, not calling CLIENT_receive\n");
1076 /******************************************************************************/
1077 /************************ SEND FUNCTIONS ****************************/
1078 /******************************************************************************/
1081 * Function called to send a message to the service.
1082 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1085 * @param cls closure, the mesh handle
1086 * @param size number of bytes available in buf
1087 * @param buf where the callee should write the connect message
1088 * @return number of bytes written to buf
1091 send_callback (void *cls, size_t size, void *buf)
1093 struct GNUNET_MESH_Handle *h = cls;
1094 struct GNUNET_MESH_TransmitHandle *th;
1095 struct GNUNET_MESH_TransmitHandle *next;
1096 struct GNUNET_MESH_Channel *ch;
1102 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1103 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() Buffer %u\n", size);
1104 if ((0 == size) || (NULL == buf))
1106 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Received NULL send callback on %p\n", h);
1113 nsize = message_ready_size (h);
1114 while ((NULL != (th = next)) && (0 < nsize) && (size >= nsize))
1117 if (GNUNET_YES == th_is_payload (th))
1119 struct GNUNET_MESH_LocalData *dmsg;
1120 struct GNUNET_MessageHeader *mh;
1122 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload\n");
1123 if (GNUNET_NO == ch->allow_send)
1125 /* This channel is not ready to transmit yet, try next message */
1129 ch->packet_size = 0;
1130 GNUNET_assert (size >= th->size);
1131 dmsg = (struct GNUNET_MESH_LocalData *) cbuf;
1132 mh = (struct GNUNET_MessageHeader *) &dmsg[1];
1133 psize = th->notify (th->notify_cls,
1134 size - sizeof (struct GNUNET_MESH_LocalData),
1138 psize += sizeof (struct GNUNET_MESH_LocalData);
1139 GNUNET_assert (size >= psize);
1140 dmsg->header.size = htons (psize);
1141 dmsg->id = htonl (ch->chid);
1142 dmsg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
1143 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload type %s\n",
1144 GM_m2s (ntohs (mh->type)));
1145 ch->allow_send = GNUNET_NO;
1149 LOG (GNUNET_ERROR_TYPE_DEBUG,
1150 "# callback returned size 0, "
1151 "application canceled transmission\n");
1156 struct GNUNET_MessageHeader *mh = (struct GNUNET_MessageHeader *) &th[1];
1158 LOG (GNUNET_ERROR_TYPE_DEBUG, "# mesh internal traffic, type %s\n",
1159 GM_m2s (ntohs (mh->type)));
1160 memcpy (cbuf, &th[1], th->size);
1163 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1164 GNUNET_SCHEDULER_cancel (th->timeout_task);
1165 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1168 nsize = message_ready_size (h);
1173 LOG (GNUNET_ERROR_TYPE_DEBUG, "# total size: %u\n", tsize);
1175 size = message_ready_size (h);
1178 LOG (GNUNET_ERROR_TYPE_DEBUG, "# next size: %u\n", size);
1180 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
1181 GNUNET_TIME_UNIT_FOREVER_REL,
1182 GNUNET_YES, &send_callback, h);
1186 if (NULL != h->th_head)
1187 LOG (GNUNET_ERROR_TYPE_DEBUG, "# can't transmit any more\n");
1189 LOG (GNUNET_ERROR_TYPE_DEBUG, "# nothing left to transmit\n");
1191 if (GNUNET_NO == h->in_receive)
1193 LOG (GNUNET_ERROR_TYPE_DEBUG, "# start receiving from service\n");
1194 h->in_receive = GNUNET_YES;
1195 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1196 GNUNET_TIME_UNIT_FOREVER_REL);
1198 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() END\n");
1204 * Auxiliary function to send an already constructed packet to the service.
1205 * Takes care of creating a new queue element, copying the message and
1206 * calling the tmt_rdy function if necessary.
1208 * @param h mesh handle
1209 * @param msg message to transmit
1210 * @param channel channel this send is related to (NULL if N/A)
1213 send_packet (struct GNUNET_MESH_Handle *h,
1214 const struct GNUNET_MessageHeader *msg,
1215 struct GNUNET_MESH_Channel *channel)
1217 struct GNUNET_MESH_TransmitHandle *th;
1220 LOG (GNUNET_ERROR_TYPE_DEBUG, " Sending message to service: %s\n",
1221 GM_m2s(ntohs(msg->type)));
1222 msize = ntohs (msg->size);
1223 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1224 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1226 th->channel = channel;
1227 memcpy (&th[1], msg, msize);
1228 add_to_queue (h, th);
1229 LOG (GNUNET_ERROR_TYPE_DEBUG, " queued\n");
1232 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling ntfy tmt rdy for %u bytes\n", msize);
1234 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1235 GNUNET_TIME_UNIT_FOREVER_REL,
1236 GNUNET_YES, &send_callback, h);
1240 /******************************************************************************/
1241 /********************** API CALL DEFINITIONS *************************/
1242 /******************************************************************************/
1244 struct GNUNET_MESH_Handle *
1245 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
1246 GNUNET_MESH_InboundChannelNotificationHandler new_channel,
1247 GNUNET_MESH_ChannelEndHandler cleaner,
1248 const struct GNUNET_MESH_MessageHandler *handlers,
1249 const uint32_t *ports)
1251 struct GNUNET_MESH_Handle *h;
1253 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1254 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1255 LOG (GNUNET_ERROR_TYPE_DEBUG, " addr %p\n", h);
1257 h->new_channel = new_channel;
1258 h->cleaner = cleaner;
1259 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1260 if (h->client == NULL)
1267 h->message_handlers = handlers;
1269 h->next_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1270 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1271 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1273 if (NULL != ports && ports[0] != 0 && NULL == new_channel)
1276 LOG (GNUNET_ERROR_TYPE_DEBUG,
1277 "no new channel handler given, ports parameter is useless!!\n");
1279 if ((NULL == ports || ports[0] == 0) && NULL != new_channel)
1282 LOG (GNUNET_ERROR_TYPE_DEBUG,
1283 "no ports given, new channel handler will never be called!!\n");
1285 /* count handlers */
1286 for (h->n_handlers = 0;
1287 handlers && handlers[h->n_handlers].type;
1289 for (h->n_ports = 0;
1290 ports && ports[h->n_ports];
1293 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1299 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1301 struct GNUNET_MESH_Channel *ch;
1302 struct GNUNET_MESH_Channel *aux;
1303 struct GNUNET_MESH_TransmitHandle *th;
1305 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH DISCONNECT\n");
1307 ch = handle->channels_head;
1311 if (ch->chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1314 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X not destroyed\n", ch->chid);
1316 destroy_channel (ch, GNUNET_YES);
1319 while ( (th = handle->th_head) != NULL)
1321 struct GNUNET_MessageHeader *msg;
1323 /* Make sure it is an allowed packet (everything else should have been
1324 * already canceled).
1326 GNUNET_break (GNUNET_NO == th_is_payload (th));
1327 msg = (struct GNUNET_MessageHeader *) &th[1];
1328 switch (ntohs(msg->type))
1330 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1331 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1332 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1333 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS:
1334 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL:
1338 LOG (GNUNET_ERROR_TYPE_ERROR, "unexpected msg %u\n",
1342 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1346 if (NULL != handle->th)
1348 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1351 if (NULL != handle->client)
1353 GNUNET_CLIENT_disconnect (handle->client);
1354 handle->client = NULL;
1356 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1358 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1359 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1361 GNUNET_free (handle);
1366 * Create a new channel towards a remote peer.
1368 * If the destination port is not open by any peer or the destination peer
1369 * does not accept the channel, #GNUNET_MESH_ChannelEndHandler will be called
1372 * @param h mesh handle
1373 * @param channel_ctx client's channel context to associate with the channel
1374 * @param peer peer identity the channel should go to
1375 * @param port Port number.
1376 * @param options MeshOption flag field, with all desired option bits set to 1.
1378 * @return handle to the channel
1380 struct GNUNET_MESH_Channel *
1381 GNUNET_MESH_channel_create (struct GNUNET_MESH_Handle *h,
1383 const struct GNUNET_PeerIdentity *peer,
1385 enum MeshOption options)
1387 struct GNUNET_MESH_Channel *ch;
1388 struct GNUNET_MESH_ChannelMessage msg;
1390 LOG (GNUNET_ERROR_TYPE_DEBUG,
1391 "Creating new channel to %s:%u\n",
1392 GNUNET_i2s (peer), port);
1393 ch = create_channel (h, 0);
1394 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", ch);
1395 LOG (GNUNET_ERROR_TYPE_DEBUG, " number %X\n", ch->chid);
1396 ch->ctx = channel_ctx;
1397 ch->peer = GNUNET_PEER_intern (peer);
1398 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
1399 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1400 msg.channel_id = htonl (ch->chid);
1401 msg.port = htonl (port);
1403 msg.opt = htonl (options);
1405 send_packet (h, &msg.header, ch);
1411 GNUNET_MESH_channel_destroy (struct GNUNET_MESH_Channel *channel)
1413 struct GNUNET_MESH_Handle *h;
1414 struct GNUNET_MESH_ChannelMessage msg;
1415 struct GNUNET_MESH_TransmitHandle *th;
1417 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying channel\n");
1420 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1421 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1422 msg.channel_id = htonl (channel->chid);
1423 memset (&msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
1429 struct GNUNET_MESH_TransmitHandle *aux;
1430 if (th->channel == channel)
1433 /* FIXME call the handler? */
1434 if (GNUNET_YES == th_is_payload (th))
1435 th->notify (th->notify_cls, 0, NULL);
1436 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1444 destroy_channel (channel, GNUNET_YES);
1445 send_packet (h, &msg.header, NULL);
1450 * Get information about a channel.
1452 * @param channel Channel handle.
1453 * @param option Query (GNUNET_MESH_OPTION_*).
1454 * @param ... dependant on option, currently not used
1456 * @return Union with an answer to the query.
1458 const union GNUNET_MESH_ChannelInfo *
1459 GNUNET_MESH_channel_get_info (struct GNUNET_MESH_Channel *channel,
1460 enum MeshOption option, ...)
1462 static int bool_flag;
1463 const union GNUNET_MESH_ChannelInfo *ret;
1467 case GNUNET_MESH_OPTION_NOBUFFER:
1468 case GNUNET_MESH_OPTION_RELIABLE:
1469 case GNUNET_MESH_OPTION_OOORDER:
1470 if (0 != (option & channel->options))
1471 bool_flag = GNUNET_YES;
1473 bool_flag = GNUNET_NO;
1474 ret = (const union GNUNET_MESH_ChannelInfo *) &bool_flag;
1476 case GNUNET_MESH_OPTION_PEER:
1477 ret = (const union GNUNET_MESH_ChannelInfo *) GNUNET_PEER_resolve2 (channel->peer);
1487 struct GNUNET_MESH_TransmitHandle *
1488 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Channel *channel, int cork,
1489 struct GNUNET_TIME_Relative maxdelay,
1491 GNUNET_CONNECTION_TransmitReadyNotify notify,
1494 struct GNUNET_MESH_TransmitHandle *th;
1496 GNUNET_assert (NULL != channel);
1497 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY\n");
1498 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", channel->chid);
1499 LOG (GNUNET_ERROR_TYPE_DEBUG, " allow_send %d\n", channel->allow_send);
1500 if (channel->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1501 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin\n");
1503 LOG (GNUNET_ERROR_TYPE_DEBUG, " to destination\n");
1504 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload size %u\n", notify_size);
1505 GNUNET_assert (NULL != notify);
1506 GNUNET_assert (0 == channel->packet_size); // Only one data packet allowed
1507 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1508 th->channel = channel;
1509 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1510 th->size = notify_size + sizeof (struct GNUNET_MESH_LocalData);
1511 channel->packet_size = th->size;
1512 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size %u\n", th->size);
1513 th->notify = notify;
1514 th->notify_cls = notify_cls;
1515 add_to_queue (channel->mesh, th);
1516 if (NULL != channel->mesh->th)
1518 if (GNUNET_NO == channel->allow_send)
1520 LOG (GNUNET_ERROR_TYPE_DEBUG, " call client notify tmt rdy\n");
1522 GNUNET_CLIENT_notify_transmit_ready (channel->mesh->client, th->size,
1523 GNUNET_TIME_UNIT_FOREVER_REL,
1524 GNUNET_YES, &send_callback,
1526 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY END\n");
1532 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1534 struct GNUNET_MESH_Handle *mesh;
1536 th->channel->packet_size = 0;
1537 mesh = th->channel->mesh;
1538 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1539 GNUNET_SCHEDULER_cancel (th->timeout_task);
1540 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1542 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
1544 /* queue empty, no point in asking for transmission */
1545 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1552 GNUNET_MESH_receive_done (struct GNUNET_MESH_Channel *channel)
1559 * Request information about the running mesh peer.
1560 * The callback will be called for every channel known to the service,
1561 * listing all active peers that blong to the channel.
1563 * If called again on the same handle, it will overwrite the previous
1564 * callback and cls. To retrieve the cls, monitor_cancel must be
1567 * WARNING: unstable API, likely to change in the future!
1569 * @param h Handle to the mesh peer.
1570 * @param callback Function to call with the requested data.
1571 * @param callback_cls Closure for @c callback.
1574 GNUNET_MESH_get_channels (struct GNUNET_MESH_Handle *h,
1575 GNUNET_MESH_ChannelsCB callback,
1578 struct GNUNET_MessageHeader msg;
1580 msg.size = htons (sizeof (msg));
1581 msg.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS);
1582 send_packet (h, &msg, NULL);
1583 h->channels_cb = callback;
1584 h->channels_cls = callback_cls;
1589 * Cancel a monitor request. The monitor callback will not be called.
1591 * @param h Mesh handle.
1593 * @return Closure given to GNUNET_MESH_monitor, if any.
1596 GNUNET_MESH_get_channels_cancel (struct GNUNET_MESH_Handle *h)
1600 cls = h->channels_cls;
1601 h->channels_cb = NULL;
1602 h->channels_cls = NULL;
1608 * Request information about a specific channel of the running mesh peer.
1610 * WARNING: unstable API, likely to change in the future!
1611 * FIXME Add destination option.
1613 * @param h Handle to the mesh peer.
1614 * @param initiator ID of the owner of the channel.
1615 * @param channel_number Channel number.
1616 * @param callback Function to call with the requested data.
1617 * @param callback_cls Closure for @c callback.
1620 GNUNET_MESH_show_channel (struct GNUNET_MESH_Handle *h,
1621 struct GNUNET_PeerIdentity *initiator,
1622 unsigned int channel_number,
1623 GNUNET_MESH_ChannelCB callback,
1626 struct GNUNET_MESH_LocalMonitor msg;
1628 msg.header.size = htons (sizeof (msg));
1629 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL);
1630 msg.owner = *initiator;
1631 msg.channel_id = htonl (channel_number);
1633 send_packet (h, &msg.header, NULL);
1634 h->channel_cb = callback;
1635 h->channel_cls = callback_cls;
1640 * Function called to notify a client about the connection
1641 * begin ready to queue more data. "buf" will be
1642 * NULL and "size" zero if the connection was closed for
1643 * writing in the meantime.
1645 * @param cls closure
1646 * @param size number of bytes available in buf
1647 * @param buf where the callee should write the message
1648 * @return number of bytes written to buf
1651 mesh_mq_ntr (void *cls, size_t size,
1654 struct GNUNET_MQ_Handle *mq = cls;
1655 struct MeshMQState *state = GNUNET_MQ_impl_state (mq);
1656 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
1662 GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_WRITE);
1665 msize = ntohs (msg->size);
1666 GNUNET_assert (msize <= size);
1667 memcpy (buf, msg, msize);
1668 GNUNET_MQ_impl_send_continue (mq);
1674 * Signature of functions implementing the
1675 * sending functionality of a message queue.
1677 * @param mq the message queue
1678 * @param msg the message to send
1679 * @param impl_state state of the implementation
1682 mesh_mq_send_impl (struct GNUNET_MQ_Handle *mq,
1683 const struct GNUNET_MessageHeader *msg, void *impl_state)
1685 struct MeshMQState *state = impl_state;
1687 GNUNET_assert (NULL == state->th);
1689 GNUNET_MESH_notify_transmit_ready (state->channel,
1690 /* FIXME: add option for corking */
1692 GNUNET_TIME_UNIT_FOREVER_REL,
1700 * Signature of functions implementing the
1701 * destruction of a message queue.
1702 * Implementations must not free 'mq', but should
1703 * take care of 'impl_state'.
1705 * @param mq the message queue to destroy
1706 * @param impl_state state of the implementation
1709 mesh_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
1711 struct MeshMQState *state = impl_state;
1713 if (NULL != state->th)
1714 GNUNET_MESH_notify_transmit_ready_cancel (state->th);
1716 GNUNET_free (state);
1721 * Create a message queue for a mesh channel.
1722 * The message queue can only be used to transmit messages,
1723 * not to receive them.
1725 * @param channel the channel to create the message qeue for
1726 * @return a message queue to messages over the channel
1728 struct GNUNET_MQ_Handle *
1729 GNUNET_MESH_mq_create (struct GNUNET_MESH_Channel *channel)
1731 struct GNUNET_MQ_Handle *mq;
1732 struct MeshMQState *state;
1734 state = GNUNET_new (struct MeshMQState);
1735 state->channel = channel;
1737 mq = GNUNET_MQ_queue_for_callbacks (mesh_mq_send_impl,
1738 mesh_mq_destroy_impl,
1739 NULL, /* FIXME: cancel impl. */
1741 NULL, /* no msg handlers */
1742 NULL, /* no err handlers */
1743 NULL); /* no handler cls */