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 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 * Is the channel allowed to buffer?
285 * Is the channel realiable?
290 * If reliable, is the channel out of order?
295 * Are we allowed to send to the service?
303 * Implementation state for mesh's message queue.
308 * The current transmit handle, or NULL
309 * if no transmit is active.
311 struct GNUNET_MESH_TransmitHandle *th;
314 * Channel to send the data over.
316 struct GNUNET_MESH_Channel *channel;
320 /******************************************************************************/
321 /*********************** DECLARATIONS *************************/
322 /******************************************************************************/
325 * Function called to send a message to the service.
326 * "buf" will be NULL and "size" zero if the socket was closed for writing in
329 * @param cls closure, the mesh handle
330 * @param size number of bytes available in buf
331 * @param buf where the callee should write the connect message
332 * @return number of bytes written to buf
335 send_callback (void *cls, size_t size, void *buf);
338 /******************************************************************************/
339 /*********************** AUXILIARY FUNCTIONS *************************/
340 /******************************************************************************/
343 * Check if transmission is a payload packet.
345 * @param th Transmission handle.
347 * @return GNUNET_YES if it is a payload packet,
348 * GNUNET_NO if it is a mesh management packet.
351 th_is_payload (struct GNUNET_MESH_TransmitHandle *th)
353 return (th->notify != NULL) ? GNUNET_YES : GNUNET_NO;
358 * Check whether there is any message ready in the queue and find the size.
360 * @param h Mesh handle.
362 * @return The size of the first ready message in the queue,
363 * 0 if there is none.
366 message_ready_size (struct GNUNET_MESH_Handle *h)
368 struct GNUNET_MESH_TransmitHandle *th;
369 struct GNUNET_MESH_Channel *ch;
371 for (th = h->th_head; NULL != th; th = th->next)
374 if (GNUNET_NO == th_is_payload (th))
376 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message internal\n");
379 if (GNUNET_YES == ch->allow_send)
381 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message payload ok\n");
390 * Get the channel handler for the channel specified by id from the given handle
391 * @param h Mesh handle
392 * @param chid ID of the wanted channel
393 * @return handle to the required channel or NULL if not found
395 static struct GNUNET_MESH_Channel *
396 retrieve_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
398 struct GNUNET_MESH_Channel *ch;
400 ch = h->channels_head;
403 if (ch->chid == chid)
412 * Create a new channel and insert it in the channel list of the mesh handle
414 * @param h Mesh handle
415 * @param chid Desired chid of the channel, 0 to assign one automatically.
417 * @return Handle to the created channel.
419 static struct GNUNET_MESH_Channel *
420 create_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
422 struct GNUNET_MESH_Channel *ch;
424 ch = GNUNET_malloc (sizeof (struct GNUNET_MESH_Channel));
425 GNUNET_CONTAINER_DLL_insert (h->channels_head, h->channels_tail, ch);
429 ch->chid = h->next_chid;
430 while (NULL != retrieve_channel (h, h->next_chid))
433 h->next_chid &= ~GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
434 h->next_chid |= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
441 ch->allow_send = GNUNET_NO;
442 ch->nobuffer = GNUNET_NO;
448 * Destroy the specified channel.
449 * - Destroys all peers, calling the disconnect callback on each if needed
450 * - Cancels all outgoing traffic for that channel, calling respective notifys
451 * - Calls cleaner if channel was inbound
452 * - Frees all memory used
454 * @param ch Pointer to the channel.
455 * @param call_cleaner Whether to call the cleaner handler.
457 * @return Handle to the required channel or NULL if not found.
460 destroy_channel (struct GNUNET_MESH_Channel *ch, int call_cleaner)
462 struct GNUNET_MESH_Handle *h;
463 struct GNUNET_MESH_TransmitHandle *th;
464 struct GNUNET_MESH_TransmitHandle *next;
466 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy_channel %X\n", ch->chid);
475 GNUNET_CONTAINER_DLL_remove (h->channels_head, h->channels_tail, ch);
477 /* signal channel destruction */
478 if ( (NULL != h->cleaner) && (0 != ch->peer) && (GNUNET_YES == call_cleaner) )
480 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cleaner\n");
481 h->cleaner (h->cls, ch, ch->ctx);
484 /* check that clients did not leave messages behind in the queue */
485 for (th = h->th_head; NULL != th; th = next)
488 if (th->channel != ch)
490 /* Clients should have aborted their requests already.
491 * Management traffic should be ok, as clients can't cancel that.
492 * If the service crashed and we are reconnecting, it's ok.
494 GNUNET_break (GNUNET_NO == th_is_payload (th)
495 || GNUNET_NO == h->in_receive);
496 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
498 /* clean up request */
499 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
500 GNUNET_SCHEDULER_cancel (th->timeout_task);
504 /* if there are no more pending requests with mesh service, cancel active request */
505 /* Note: this should be unnecessary... */
506 if ((0 == message_ready_size (h)) && (NULL != h->th))
508 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
513 GNUNET_PEER_change_rc (ch->peer, -1);
520 * Notify client that the transmission has timed out
523 * @param tc task context
526 timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
528 struct GNUNET_MESH_TransmitHandle *th = cls;
529 struct GNUNET_MESH_Handle *mesh;
531 mesh = th->channel->mesh;
532 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
533 th->channel->packet_size = 0;
534 if (GNUNET_YES == th_is_payload (th))
535 th->notify (th->notify_cls, 0, NULL);
537 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
539 /* nothing ready to transmit, no point in asking for transmission */
540 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
547 * Add a transmit handle to the transmission queue and set the
550 * @param h mesh handle with the queue head and tail
551 * @param th handle to the packet to be transmitted
554 add_to_queue (struct GNUNET_MESH_Handle *h,
555 struct GNUNET_MESH_TransmitHandle *th)
557 GNUNET_CONTAINER_DLL_insert_tail (h->th_head, h->th_tail, th);
558 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == th->timeout.abs_value_us)
561 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
562 (th->timeout), &timeout_transmission, th);
567 * Auxiliary function to send an already constructed packet to the service.
568 * Takes care of creating a new queue element, copying the message and
569 * calling the tmt_rdy function if necessary.
571 * @param h mesh handle
572 * @param msg message to transmit
573 * @param channel channel this send is related to (NULL if N/A)
576 send_packet (struct GNUNET_MESH_Handle *h,
577 const struct GNUNET_MessageHeader *msg,
578 struct GNUNET_MESH_Channel *channel);
582 * Send an ack on the channel to confirm the processing of a message.
584 * @param ch Channel on which to send the ACK.
587 send_ack (struct GNUNET_MESH_Channel *ch)
589 struct GNUNET_MESH_LocalAck msg;
591 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK on channel %X\n", ch->chid);
592 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
593 msg.header.size = htons (sizeof (msg));
594 msg.channel_id = htonl (ch->chid);
596 send_packet (ch->mesh, &msg.header, ch);
603 * Reconnect callback: tries to reconnect again after a failer previous
605 * @param cls closure (mesh handle)
606 * @param tc task context
609 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
613 * Send a connect packet to the service with the applications and types
614 * requested by the user.
616 * @param h The mesh handle.
620 send_connect (struct GNUNET_MESH_Handle *h)
624 size = sizeof (struct GNUNET_MESH_ClientConnect);
625 size += h->n_ports * sizeof (uint32_t);
627 char buf[size] GNUNET_ALIGN;
628 struct GNUNET_MESH_ClientConnect *msg;
632 /* build connection packet */
633 msg = (struct GNUNET_MESH_ClientConnect *) buf;
634 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
635 msg->header.size = htons (size);
636 ports = (uint32_t *) &msg[1];
637 for (i = 0; i < h->n_ports; i++)
639 ports[i] = htonl (h->ports[i]);
640 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n",
643 LOG (GNUNET_ERROR_TYPE_DEBUG,
644 "Sending %lu bytes long message with %u ports\n",
645 ntohs (msg->header.size), h->n_ports);
646 send_packet (h, &msg->header, NULL);
652 * Reconnect to the service, retransmit all infomation to try to restore the
655 * @param h handle to the mesh
657 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
660 do_reconnect (struct GNUNET_MESH_Handle *h)
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
663 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
664 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "******** on %p *******\n", h);
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
671 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
674 if (NULL != h->client)
676 GNUNET_CLIENT_disconnect (h->client);
680 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
681 if (h->client == NULL)
683 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
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, "Next retry in %s\n",
690 GNUNET_STRINGS_relative_time_to_string (h->reconnect_time,
697 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
704 * Reconnect callback: tries to reconnect again after a failer previous
706 * @param cls closure (mesh handle)
707 * @param tc task context
710 reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
712 struct GNUNET_MESH_Handle *h = cls;
714 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
715 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
722 * Reconnect to the service, retransmit all infomation to try to restore the
725 * @param h handle to the mesh
727 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
730 reconnect (struct GNUNET_MESH_Handle *h)
732 struct GNUNET_MESH_Channel *ch;
733 struct GNUNET_MESH_Channel *next;
735 LOG (GNUNET_ERROR_TYPE_DEBUG,
736 "Requested RECONNECT, destroying all channels\n");
737 h->in_receive = GNUNET_NO;
738 for (ch = h->channels_head; NULL != ch; ch = next)
741 destroy_channel (ch, GNUNET_YES);
743 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
744 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
749 /******************************************************************************/
750 /*********************** RECEIVE HANDLERS ****************************/
751 /******************************************************************************/
754 * Process the new channel notification and add it to the channels in the handle
756 * @param h The mesh handle
757 * @param msg A message with the details of the new incoming channel
760 process_channel_created (struct GNUNET_MESH_Handle *h,
761 const struct GNUNET_MESH_ChannelMessage *msg)
763 struct GNUNET_MESH_Channel *ch;
764 MESH_ChannelNumber chid;
767 chid = ntohl (msg->channel_id);
768 port = ntohl (msg->port);
769 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating incoming channel %X:%u\n", chid, port);
770 if (chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
775 if (NULL != h->new_channel)
779 ch = create_channel (h, chid);
780 ch->allow_send = GNUNET_NO;
781 ch->peer = GNUNET_PEER_intern (&msg->peer);
785 if (0 != (msg->opt & GNUNET_MESH_OPTION_NOBUFFER))
786 ch->nobuffer = GNUNET_YES;
788 ch->nobuffer = GNUNET_NO;
790 if (0 != (msg->opt & GNUNET_MESH_OPTION_RELIABLE))
791 ch->reliable = GNUNET_YES;
793 ch->reliable = GNUNET_NO;
795 if (GNUNET_YES == ch->reliable &&
796 0 != (msg->opt & GNUNET_MESH_OPTION_OOORDER))
797 ch->ooorder = GNUNET_YES;
799 ch->ooorder = GNUNET_NO;
801 LOG (GNUNET_ERROR_TYPE_DEBUG, " created channel %p\n", ch);
802 ctx = h->new_channel (h->cls, ch, &msg->peer, ch->port);
805 LOG (GNUNET_ERROR_TYPE_DEBUG, "User notified\n");
809 struct GNUNET_MESH_ChannelMessage d_msg;
811 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming channels\n");
813 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
814 d_msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
815 d_msg.channel_id = msg->channel_id;
816 memset (&d_msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
820 send_packet (h, &d_msg.header, NULL);
827 * Process the channel destroy notification and free associated resources
829 * @param h The mesh handle
830 * @param msg A message with the details of the channel being destroyed
833 process_channel_destroy (struct GNUNET_MESH_Handle *h,
834 const struct GNUNET_MESH_ChannelMessage *msg)
836 struct GNUNET_MESH_Channel *ch;
837 MESH_ChannelNumber chid;
839 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel Destroy received from service\n");
840 chid = ntohl (msg->channel_id);
841 ch = retrieve_channel (h, chid);
845 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X unknown\n", chid);
848 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroying channel %X\n", ch->chid);
849 destroy_channel (ch, GNUNET_YES);
854 * Process the incoming data packets, call appropriate handlers.
856 * @param h The mesh handle
857 * @param message A message encapsulating the data
860 process_incoming_data (struct GNUNET_MESH_Handle *h,
861 const struct GNUNET_MessageHeader *message)
863 const struct GNUNET_MessageHeader *payload;
864 const struct GNUNET_MESH_MessageHandler *handler;
865 struct GNUNET_MESH_LocalData *dmsg;
866 struct GNUNET_MESH_Channel *ch;
870 LOG (GNUNET_ERROR_TYPE_DEBUG,
871 "Got a data message!\n");
872 dmsg = (struct GNUNET_MESH_LocalData *) message;
873 ch = retrieve_channel (h, ntohl (dmsg->id));
874 payload = (struct GNUNET_MessageHeader *) &dmsg[1];
875 LOG (GNUNET_ERROR_TYPE_DEBUG,
876 " %s data on channel %s [%X]\n",
877 ch->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ? "fwd" : "bck",
878 GNUNET_i2s (GNUNET_PEER_resolve2 (ch->peer)), ntohl (dmsg->id));
881 /* Channel was ignored/destroyed, probably service didn't get it yet */
882 LOG (GNUNET_ERROR_TYPE_DEBUG, " ignored!\n");
885 type = ntohs (payload->type);
886 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload type %u\n", type);
887 for (i = 0; i < h->n_handlers; i++)
889 handler = &h->message_handlers[i];
890 LOG (GNUNET_ERROR_TYPE_DEBUG,
891 " checking handler for type %u\n",
893 if (handler->type == type)
896 handler->callback (h->cls, ch, &ch->ctx, payload))
898 LOG (GNUNET_ERROR_TYPE_DEBUG, "callback caused disconnection\n");
899 GNUNET_MESH_channel_destroy (ch);
904 LOG (GNUNET_ERROR_TYPE_DEBUG,
905 "callback completed successfully\n");
914 * Process a local ACK message, enabling the client to send
915 * more data to the service.
917 * @param h Mesh handle.
918 * @param message Message itself.
921 process_ack (struct GNUNET_MESH_Handle *h,
922 const struct GNUNET_MessageHeader *message)
924 struct GNUNET_MESH_LocalAck *msg;
925 struct GNUNET_MESH_Channel *ch;
926 MESH_ChannelNumber chid;
928 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK!\n");
929 msg = (struct GNUNET_MESH_LocalAck *) message;
930 chid = ntohl (msg->channel_id);
931 ch = retrieve_channel (h, chid);
934 LOG (GNUNET_ERROR_TYPE_WARNING, "ACK on unknown channel %X\n", chid);
937 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X!\n", ch->chid);
938 ch->allow_send = GNUNET_YES;
939 if (NULL == h->th && 0 < ch->packet_size)
941 LOG (GNUNET_ERROR_TYPE_DEBUG, " tmt rdy was NULL, requesting!\n");
943 GNUNET_CLIENT_notify_transmit_ready (h->client, ch->packet_size,
944 GNUNET_TIME_UNIT_FOREVER_REL,
945 GNUNET_YES, &send_callback, h);
951 * Process a local reply about info on all channels, pass info to the user.
953 * @param h Mesh handle.
954 * @param message Message itself.
957 // process_get_channels (struct GNUNET_MESH_Handle *h,
958 // const struct GNUNET_MessageHeader *message)
960 // struct GNUNET_MESH_LocalMonitor *msg;
962 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get Channels messasge received\n");
964 // if (NULL == h->channels_cb)
966 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
970 // msg = (struct GNUNET_MESH_LocalMonitor *) message;
971 // if (ntohs (message->size) !=
972 // (sizeof (struct GNUNET_MESH_LocalMonitor) +
973 // sizeof (struct GNUNET_PeerIdentity)))
975 // GNUNET_break_op (0);
976 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
977 // "Get channels message: size %hu - expected %u\n",
978 // ntohs (message->size),
979 // sizeof (struct GNUNET_MESH_LocalMonitor));
982 // h->channels_cb (h->channels_cls,
983 // ntohl (msg->channel_id),
985 // &msg->destination);
991 * Process a local monitor_channel reply, pass info to the user.
993 * @param h Mesh handle.
994 * @param message Message itself.
997 // process_show_channel (struct GNUNET_MESH_Handle *h,
998 // const struct GNUNET_MessageHeader *message)
1000 // struct GNUNET_MESH_LocalMonitor *msg;
1003 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show Channel messasge received\n");
1005 // if (NULL == h->channel_cb)
1007 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
1011 // /* Verify message sanity */
1012 // msg = (struct GNUNET_MESH_LocalMonitor *) message;
1013 // esize = sizeof (struct GNUNET_MESH_LocalMonitor);
1014 // if (ntohs (message->size) != esize)
1016 // GNUNET_break_op (0);
1017 // GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1018 // "Show channel message: size %hu - expected %u\n",
1019 // ntohs (message->size),
1022 // h->channel_cb (h->channel_cls, NULL, NULL);
1023 // h->channel_cb = NULL;
1024 // h->channel_cls = NULL;
1029 // h->channel_cb (h->channel_cls,
1030 // &msg->destination,
1036 * Function to process all messages received from the service
1038 * @param cls closure
1039 * @param msg message received, NULL on timeout or fatal error
1042 msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1044 struct GNUNET_MESH_Handle *h = cls;
1049 LOG (GNUNET_ERROR_TYPE_DEBUG,
1050 "Mesh service disconnected, reconnecting\n", h);
1054 type = ntohs (msg->type);
1055 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1056 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a message: %s\n",
1060 /* Notify of a new incoming channel */
1061 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1062 process_channel_created (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1064 /* Notify of a channel disconnection */
1065 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY: /* TODO separate(gid problem)*/
1066 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_NACK:
1067 process_channel_destroy (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1069 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA:
1070 process_incoming_data (h, msg);
1072 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
1073 process_ack (h, msg);
1075 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS: DEPRECATED
1076 // process_get_channels (h, msg);
1078 // case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL: DEPRECATED
1079 // process_show_channel (h, msg);
1082 /* We shouldn't get any other packages, log and ignore */
1083 LOG (GNUNET_ERROR_TYPE_WARNING,
1084 "unsolicited message form service (type %s)\n",
1085 GM_m2s (ntohs (msg->type)));
1087 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1088 if (GNUNET_YES == h->in_receive)
1090 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1091 GNUNET_TIME_UNIT_FOREVER_REL);
1095 LOG (GNUNET_ERROR_TYPE_DEBUG,
1096 "in receive off, not calling CLIENT_receive\n");
1101 /******************************************************************************/
1102 /************************ SEND FUNCTIONS ****************************/
1103 /******************************************************************************/
1106 * Function called to send a message to the service.
1107 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1110 * @param cls closure, the mesh handle
1111 * @param size number of bytes available in buf
1112 * @param buf where the callee should write the connect message
1113 * @return number of bytes written to buf
1116 send_callback (void *cls, size_t size, void *buf)
1118 struct GNUNET_MESH_Handle *h = cls;
1119 struct GNUNET_MESH_TransmitHandle *th;
1120 struct GNUNET_MESH_TransmitHandle *next;
1121 struct GNUNET_MESH_Channel *ch;
1127 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1128 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() Buffer %u\n", size);
1129 if ((0 == size) || (NULL == buf))
1131 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Received NULL send callback on %p\n", h);
1138 nsize = message_ready_size (h);
1139 while ((NULL != (th = next)) && (0 < nsize) && (size >= nsize))
1142 if (GNUNET_YES == th_is_payload (th))
1144 struct GNUNET_MESH_LocalData *dmsg;
1145 struct GNUNET_MessageHeader *mh;
1147 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload\n");
1148 if (GNUNET_NO == ch->allow_send)
1150 /* This channel is not ready to transmit yet, try next message */
1154 ch->packet_size = 0;
1155 GNUNET_assert (size >= th->size);
1156 dmsg = (struct GNUNET_MESH_LocalData *) cbuf;
1157 mh = (struct GNUNET_MessageHeader *) &dmsg[1];
1158 psize = th->notify (th->notify_cls,
1159 size - sizeof (struct GNUNET_MESH_LocalData),
1163 psize += sizeof (struct GNUNET_MESH_LocalData);
1164 GNUNET_assert (size >= psize);
1165 dmsg->header.size = htons (psize);
1166 dmsg->id = htonl (ch->chid);
1167 dmsg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
1168 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload type %s\n",
1169 GM_m2s (ntohs (mh->type)));
1170 ch->allow_send = GNUNET_NO;
1174 LOG (GNUNET_ERROR_TYPE_DEBUG,
1175 "# callback returned size 0, "
1176 "application canceled transmission\n");
1181 struct GNUNET_MessageHeader *mh = (struct GNUNET_MessageHeader *) &th[1];
1183 LOG (GNUNET_ERROR_TYPE_DEBUG, "# mesh internal traffic, type %s\n",
1184 GM_m2s (ntohs (mh->type)));
1185 memcpy (cbuf, &th[1], th->size);
1188 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1189 GNUNET_SCHEDULER_cancel (th->timeout_task);
1190 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1193 nsize = message_ready_size (h);
1198 LOG (GNUNET_ERROR_TYPE_DEBUG, "# total size: %u\n", tsize);
1200 size = message_ready_size (h);
1203 LOG (GNUNET_ERROR_TYPE_DEBUG, "# next size: %u\n", size);
1205 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
1206 GNUNET_TIME_UNIT_FOREVER_REL,
1207 GNUNET_YES, &send_callback, h);
1211 if (NULL != h->th_head)
1212 LOG (GNUNET_ERROR_TYPE_DEBUG, "# can't transmit any more\n");
1214 LOG (GNUNET_ERROR_TYPE_DEBUG, "# nothing left to transmit\n");
1216 if (GNUNET_NO == h->in_receive)
1218 LOG (GNUNET_ERROR_TYPE_DEBUG, "# start receiving from service\n");
1219 h->in_receive = GNUNET_YES;
1220 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1221 GNUNET_TIME_UNIT_FOREVER_REL);
1223 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() END\n");
1229 * Auxiliary function to send an already constructed packet to the service.
1230 * Takes care of creating a new queue element, copying the message and
1231 * calling the tmt_rdy function if necessary.
1233 * @param h mesh handle
1234 * @param msg message to transmit
1235 * @param channel channel this send is related to (NULL if N/A)
1238 send_packet (struct GNUNET_MESH_Handle *h,
1239 const struct GNUNET_MessageHeader *msg,
1240 struct GNUNET_MESH_Channel *channel)
1242 struct GNUNET_MESH_TransmitHandle *th;
1245 LOG (GNUNET_ERROR_TYPE_DEBUG, " Sending message to service: %s\n",
1246 GM_m2s(ntohs(msg->type)));
1247 msize = ntohs (msg->size);
1248 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1249 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1251 th->channel = channel;
1252 memcpy (&th[1], msg, msize);
1253 add_to_queue (h, th);
1254 LOG (GNUNET_ERROR_TYPE_DEBUG, " queued\n");
1257 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling ntfy tmt rdy for %u bytes\n", msize);
1259 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1260 GNUNET_TIME_UNIT_FOREVER_REL,
1261 GNUNET_YES, &send_callback, h);
1265 /******************************************************************************/
1266 /********************** API CALL DEFINITIONS *************************/
1267 /******************************************************************************/
1269 struct GNUNET_MESH_Handle *
1270 GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
1271 GNUNET_MESH_InboundChannelNotificationHandler new_channel,
1272 GNUNET_MESH_ChannelEndHandler cleaner,
1273 const struct GNUNET_MESH_MessageHandler *handlers,
1274 const uint32_t *ports)
1276 struct GNUNET_MESH_Handle *h;
1278 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1279 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1280 LOG (GNUNET_ERROR_TYPE_DEBUG, " addr %p\n", h);
1282 h->new_channel = new_channel;
1283 h->cleaner = cleaner;
1284 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1285 if (h->client == NULL)
1292 h->message_handlers = handlers;
1294 h->next_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1295 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1296 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1298 if (NULL != ports && ports[0] != 0 && NULL == new_channel)
1301 LOG (GNUNET_ERROR_TYPE_DEBUG,
1302 "no new channel handler given, ports parameter is useless!!\n");
1304 if ((NULL == ports || ports[0] == 0) && NULL != new_channel)
1307 LOG (GNUNET_ERROR_TYPE_DEBUG,
1308 "no ports given, new channel handler will never be called!!\n");
1310 /* count handlers */
1311 for (h->n_handlers = 0;
1312 handlers && handlers[h->n_handlers].type;
1314 for (h->n_ports = 0;
1315 ports && ports[h->n_ports];
1318 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1324 GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1326 struct GNUNET_MESH_Channel *ch;
1327 struct GNUNET_MESH_Channel *aux;
1328 struct GNUNET_MESH_TransmitHandle *th;
1330 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH DISCONNECT\n");
1332 ch = handle->channels_head;
1336 if (ch->chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1339 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X not destroyed\n", ch->chid);
1341 destroy_channel (ch, GNUNET_YES);
1344 while ( (th = handle->th_head) != NULL)
1346 struct GNUNET_MessageHeader *msg;
1348 /* Make sure it is an allowed packet (everything else should have been
1349 * already canceled).
1351 GNUNET_break (GNUNET_NO == th_is_payload (th));
1352 msg = (struct GNUNET_MessageHeader *) &th[1];
1353 switch (ntohs(msg->type))
1355 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1356 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1357 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1358 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS:
1359 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL:
1363 LOG (GNUNET_ERROR_TYPE_ERROR, "unexpected msg %u\n",
1367 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1371 if (NULL != handle->th)
1373 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1376 if (NULL != handle->client)
1378 GNUNET_CLIENT_disconnect (handle->client);
1379 handle->client = NULL;
1381 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1383 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1384 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1386 GNUNET_free (handle);
1391 * Create a new channel towards a remote peer.
1393 * If the destination port is not open by any peer or the destination peer
1394 * does not accept the channel, #GNUNET_MESH_ChannelEndHandler will be called
1397 * @param h mesh handle
1398 * @param channel_ctx client's channel context to associate with the channel
1399 * @param peer peer identity the channel should go to
1400 * @param port Port number.
1401 * @param nobuffer Flag for disabling buffering on relay nodes.
1402 * @param reliable Flag for end-to-end reliability.
1404 * @return handle to the channel
1406 struct GNUNET_MESH_Channel *
1407 GNUNET_MESH_channel_create (struct GNUNET_MESH_Handle *h,
1409 const struct GNUNET_PeerIdentity *peer,
1414 struct GNUNET_MESH_Channel *ch;
1415 struct GNUNET_MESH_ChannelMessage msg;
1417 LOG (GNUNET_ERROR_TYPE_DEBUG,
1418 "Creating new channel to %s:%u\n",
1419 GNUNET_i2s (peer), port);
1420 ch = create_channel (h, 0);
1421 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", ch);
1422 LOG (GNUNET_ERROR_TYPE_DEBUG, " number %X\n", ch->chid);
1423 ch->ctx = channel_ctx;
1424 ch->peer = GNUNET_PEER_intern (peer);
1425 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
1426 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1427 msg.channel_id = htonl (ch->chid);
1428 msg.port = htonl (port);
1431 if (GNUNET_YES == reliable)
1432 msg.opt |= GNUNET_MESH_OPTION_RELIABLE;
1433 if (GNUNET_YES == nobuffer)
1434 msg.opt |= GNUNET_MESH_OPTION_NOBUFFER;
1435 msg.opt = htonl (msg.opt);
1437 send_packet (h, &msg.header, ch);
1443 GNUNET_MESH_channel_destroy (struct GNUNET_MESH_Channel *channel)
1445 struct GNUNET_MESH_Handle *h;
1446 struct GNUNET_MESH_ChannelMessage msg;
1447 struct GNUNET_MESH_TransmitHandle *th;
1449 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying channel\n");
1452 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1453 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1454 msg.channel_id = htonl (channel->chid);
1455 memset (&msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
1461 struct GNUNET_MESH_TransmitHandle *aux;
1462 if (th->channel == channel)
1465 /* FIXME call the handler? */
1466 if (GNUNET_YES == th_is_payload (th))
1467 th->notify (th->notify_cls, 0, NULL);
1468 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1476 destroy_channel (channel, GNUNET_YES);
1477 send_packet (h, &msg.header, NULL);
1482 * Get information about a channel.
1484 * @param channel Channel handle.
1485 * @param option Query (GNUNET_MESH_OPTION_*).
1486 * @param ... dependant on option, currently not used
1488 * @return Union with an answer to the query.
1490 const union GNUNET_MESH_ChannelInfo *
1491 GNUNET_MESH_channel_get_info (struct GNUNET_MESH_Channel *channel,
1492 enum MeshOption option, ...)
1494 const union GNUNET_MESH_ChannelInfo *ret;
1498 case GNUNET_MESH_OPTION_NOBUFFER:
1499 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->nobuffer;
1501 case GNUNET_MESH_OPTION_RELIABLE:
1502 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->reliable;
1504 case GNUNET_MESH_OPTION_OOORDER:
1505 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->ooorder;
1507 case GNUNET_MESH_OPTION_PEER:
1508 ret = (const union GNUNET_MESH_ChannelInfo *) GNUNET_PEER_resolve2 (channel->peer);
1518 struct GNUNET_MESH_TransmitHandle *
1519 GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Channel *channel, int cork,
1520 struct GNUNET_TIME_Relative maxdelay,
1522 GNUNET_CONNECTION_TransmitReadyNotify notify,
1525 struct GNUNET_MESH_TransmitHandle *th;
1527 GNUNET_assert (NULL != channel);
1528 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY\n");
1529 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", channel->chid);
1530 LOG (GNUNET_ERROR_TYPE_DEBUG, " allow_send %d\n", channel->allow_send);
1531 if (channel->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1532 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin\n");
1534 LOG (GNUNET_ERROR_TYPE_DEBUG, " to destination\n");
1535 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload size %u\n", notify_size);
1536 GNUNET_assert (NULL != notify);
1537 GNUNET_assert (0 == channel->packet_size); // Only one data packet allowed
1538 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1539 th->channel = channel;
1540 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1541 th->size = notify_size + sizeof (struct GNUNET_MESH_LocalData);
1542 channel->packet_size = th->size;
1543 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size %u\n", th->size);
1544 th->notify = notify;
1545 th->notify_cls = notify_cls;
1546 add_to_queue (channel->mesh, th);
1547 if (NULL != channel->mesh->th)
1549 if (GNUNET_NO == channel->allow_send)
1551 LOG (GNUNET_ERROR_TYPE_DEBUG, " call client notify tmt rdy\n");
1553 GNUNET_CLIENT_notify_transmit_ready (channel->mesh->client, th->size,
1554 GNUNET_TIME_UNIT_FOREVER_REL,
1555 GNUNET_YES, &send_callback,
1557 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY END\n");
1563 GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1565 struct GNUNET_MESH_Handle *mesh;
1567 th->channel->packet_size = 0;
1568 mesh = th->channel->mesh;
1569 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1570 GNUNET_SCHEDULER_cancel (th->timeout_task);
1571 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1573 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
1575 /* queue empty, no point in asking for transmission */
1576 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1583 GNUNET_MESH_receive_done (struct GNUNET_MESH_Channel *channel)
1590 * Request information about the running mesh peer.
1591 * The callback will be called for every channel known to the service,
1592 * listing all active peers that blong to the channel.
1594 * If called again on the same handle, it will overwrite the previous
1595 * callback and cls. To retrieve the cls, monitor_cancel must be
1598 * WARNING: unstable API, likely to change in the future!
1600 * @param h Handle to the mesh peer.
1601 * @param callback Function to call with the requested data.
1602 * @param callback_cls Closure for @c callback.
1605 GNUNET_MESH_get_channels (struct GNUNET_MESH_Handle *h,
1606 GNUNET_MESH_ChannelsCB callback,
1609 struct GNUNET_MessageHeader msg;
1611 msg.size = htons (sizeof (msg));
1612 msg.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS);
1613 send_packet (h, &msg, NULL);
1614 h->channels_cb = callback;
1615 h->channels_cls = callback_cls;
1620 * Cancel a monitor request. The monitor callback will not be called.
1622 * @param h Mesh handle.
1624 * @return Closure given to GNUNET_MESH_monitor, if any.
1627 GNUNET_MESH_get_channels_cancel (struct GNUNET_MESH_Handle *h)
1631 cls = h->channels_cls;
1632 h->channels_cb = NULL;
1633 h->channels_cls = NULL;
1639 * Request information about a specific channel of the running mesh peer.
1641 * WARNING: unstable API, likely to change in the future!
1642 * FIXME Add destination option.
1644 * @param h Handle to the mesh peer.
1645 * @param initiator ID of the owner of the channel.
1646 * @param channel_number Channel number.
1647 * @param callback Function to call with the requested data.
1648 * @param callback_cls Closure for @c callback.
1651 GNUNET_MESH_show_channel (struct GNUNET_MESH_Handle *h,
1652 struct GNUNET_PeerIdentity *initiator,
1653 unsigned int channel_number,
1654 GNUNET_MESH_ChannelCB callback,
1657 struct GNUNET_MESH_LocalMonitor msg;
1659 msg.header.size = htons (sizeof (msg));
1660 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL);
1661 msg.owner = *initiator;
1662 msg.channel_id = htonl (channel_number);
1664 send_packet (h, &msg.header, NULL);
1665 h->channel_cb = callback;
1666 h->channel_cls = callback_cls;
1671 * Function called to notify a client about the connection
1672 * begin ready to queue more data. "buf" will be
1673 * NULL and "size" zero if the connection was closed for
1674 * writing in the meantime.
1676 * @param cls closure
1677 * @param size number of bytes available in buf
1678 * @param buf where the callee should write the message
1679 * @return number of bytes written to buf
1682 mesh_mq_ntr (void *cls, size_t size,
1685 struct GNUNET_MQ_Handle *mq = cls;
1686 struct MeshMQState *state = GNUNET_MQ_impl_state (mq);
1687 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
1693 GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_WRITE);
1696 msize = ntohs (msg->size);
1697 GNUNET_assert (msize <= size);
1698 memcpy (buf, msg, msize);
1699 GNUNET_MQ_impl_send_continue (mq);
1705 * Signature of functions implementing the
1706 * sending functionality of a message queue.
1708 * @param mq the message queue
1709 * @param msg the message to send
1710 * @param impl_state state of the implementation
1713 mesh_mq_send_impl (struct GNUNET_MQ_Handle *mq,
1714 const struct GNUNET_MessageHeader *msg, void *impl_state)
1716 struct MeshMQState *state = impl_state;
1718 GNUNET_assert (NULL == state->th);
1720 GNUNET_MESH_notify_transmit_ready (state->channel,
1721 /* FIXME: add option for corking */
1723 GNUNET_TIME_UNIT_FOREVER_REL,
1731 * Signature of functions implementing the
1732 * destruction of a message queue.
1733 * Implementations must not free 'mq', but should
1734 * take care of 'impl_state'.
1736 * @param mq the message queue to destroy
1737 * @param impl_state state of the implementation
1740 mesh_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
1742 struct MeshMQState *state = impl_state;
1744 if (NULL != state->th)
1745 GNUNET_MESH_notify_transmit_ready_cancel (state->th);
1747 GNUNET_free (state);
1752 * Create a message queue for a mesh channel.
1753 * The message queue can only be used to transmit messages,
1754 * not to receive them.
1756 * @param channel the channel to create the message qeue for
1757 * @return a message queue to messages over the channel
1759 struct GNUNET_MQ_Handle *
1760 GNUNET_MESH_mq_create (struct GNUNET_MESH_Channel *channel)
1762 struct GNUNET_MQ_Handle *mq;
1763 struct MeshMQState *state;
1765 state = GNUNET_new (struct MeshMQState);
1766 state->channel = channel;
1768 mq = GNUNET_MQ_queue_for_callbacks (mesh_mq_send_impl,
1769 mesh_mq_destroy_impl,
1770 NULL, /* FIXME: cancel impl. */
1772 NULL, /* no msg handlers */
1773 NULL, /* no err handlers */
1774 NULL); /* no handler cls */