2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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7 by the Free Software Foundation; either version 2, or (at your
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13 General Public License for more details.
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18 Boston, MA 02111-1307, USA.
22 * @file core/core_api.c
23 * @brief core service; this is the main API for encrypted P2P
25 * @author Christian Grothoff
28 #include "gnunet_core_service.h"
33 * Context for the core service connection.
35 struct GNUNET_CORE_Handle
41 struct GNUNET_SCHEDULER_Handle *sched;
44 * Configuration we're using.
46 const struct GNUNET_CONFIGURATION_Handle *cfg;
49 * Closure for the various callbacks.
54 * Function to call once we've handshaked with the core service.
56 GNUNET_CORE_StartupCallback init;
59 * Function to call whenever we're notified about a peer connecting
60 * (pre-connects, no session key exchange yet).
62 GNUNET_CORE_ConnectEventHandler pre_connects;
65 * Function to call whenever we're notified about a peer connecting.
67 GNUNET_CORE_ConnectEventHandler connects;
70 * Function to call whenever we're notified about a peer disconnecting.
72 GNUNET_CORE_DisconnectEventHandler disconnects;
75 * Function to call whenever we receive an inbound message.
77 GNUNET_CORE_MessageCallback inbound_notify;
80 * Function to call whenever we receive an outbound message.
82 GNUNET_CORE_MessageCallback outbound_notify;
85 * Function handlers for messages of particular type.
87 const struct GNUNET_CORE_MessageHandler *handlers;
90 * Our connection to the service for notifications.
92 struct GNUNET_CLIENT_Connection *client_notifications;
95 * Handle for our current transmission request.
97 struct GNUNET_CLIENT_TransmitHandle *th;
100 * Head of doubly-linked list of pending requests.
102 struct GNUNET_CORE_TransmitHandle *pending_head;
105 * Tail of doubly-linked list of pending requests.
107 struct GNUNET_CORE_TransmitHandle *pending_tail;
110 * Currently submitted request (or NULL)
112 struct GNUNET_CORE_TransmitHandle *submitted;
115 * Currently submitted request based on solicitation (or NULL)
117 struct GNUNET_CORE_TransmitHandle *solicit_transmit_req;
120 * Buffer where we store a message for transmission in response
121 * to a traffic solicitation (or NULL).
123 char *solicit_buffer;
126 * How long to wait until we time out the connection attempt?
128 struct GNUNET_TIME_Absolute startup_timeout;
131 * ID of reconnect task (if any).
133 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
136 * Number of entries in the handlers array.
141 * For inbound notifications without a specific handler, do
142 * we expect to only receive headers?
144 int inbound_hdr_only;
147 * For outbound notifications without a specific handler, do
148 * we expect to only receive headers?
150 int outbound_hdr_only;
153 * Are we currently disconnected and hence unable to forward
161 * Handle for a transmission request.
163 struct GNUNET_CORE_TransmitHandle
167 * We keep active transmit handles in a doubly-linked list.
169 struct GNUNET_CORE_TransmitHandle *next;
172 * We keep active transmit handles in a doubly-linked list.
174 struct GNUNET_CORE_TransmitHandle *prev;
177 * Corresponding core handle.
179 struct GNUNET_CORE_Handle *ch;
182 * Function that will be called to get the actual request
183 * (once we are ready to transmit this request to the core).
184 * The function will be called with a NULL buffer to signal
187 GNUNET_CONNECTION_TransmitReadyNotify get_message;
190 * Closure for get_message.
192 void *get_message_cls;
195 * If this entry is for a configuration request, pointer
196 * to the information callback; otherwise NULL.
198 GNUNET_CORE_PeerConfigurationInfoCallback info;
206 * If this entry is for a transmission request, pointer
207 * to the notify callback; otherwise NULL.
209 GNUNET_CONNECTION_TransmitReadyNotify notify;
212 * Closure for notify.
217 * Peer the request is about.
219 struct GNUNET_PeerIdentity peer;
222 * Timeout for this handle.
224 struct GNUNET_TIME_Absolute timeout;
227 * ID of timeout task.
229 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
232 * How important is this message?
237 * Size of this request.
246 * Function called when we are ready to transmit our
247 * "START" message (or when this operation timed out).
250 * @param size number of bytes available in buf
251 * @param buf where the callee should write the message
252 * @return number of bytes written to buf
254 static size_t transmit_start (void *cls, size_t size, void *buf);
258 * Our current client connection went down. Clean it up
259 * and try to reconnect!
261 * @param h our handle to the core service
264 reconnect (struct GNUNET_CORE_Handle *h)
266 GNUNET_CLIENT_disconnect (h->client_notifications);
267 h->currently_down = GNUNET_YES;
268 h->client_notifications = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
269 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
270 sizeof (struct InitMessage) +
271 sizeof (uint16_t) * h->hcnt,
272 GNUNET_TIME_UNIT_SECONDS,
279 * The given request hit its timeout. Remove from the
280 * doubly-linked list and call the respective continuation.
282 * @param cls the transmit handle of the request that timed out
283 * @param tc context, can be NULL (!)
286 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
288 struct GNUNET_CORE_TransmitHandle *th = cls;
290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
291 "Transmission request timed out.\n");
292 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
293 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
298 * Function called when we are ready to transmit a request from our
299 * request list (or when this operation timed out).
302 * @param size number of bytes available in buf
303 * @param buf where the callee should write the message
304 * @return number of bytes written to buf
307 request_start (void *cls, size_t size, void *buf)
309 struct GNUNET_CORE_Handle *h = cls;
310 struct GNUNET_CORE_TransmitHandle *th;
314 th = h->pending_head;
317 timeout_request (th, NULL);
320 /* create new timeout task (in case core takes too long to respond!) */
321 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
322 GNUNET_TIME_absolute_get_remaining
324 &timeout_request, th);
325 /* remove th from doubly-linked pending list, move to submitted */
326 GNUNET_assert (th->prev == NULL);
327 h->pending_head = th->next;
328 if (th->next == NULL)
329 h->pending_tail = NULL;
331 th->next->prev = NULL;
332 GNUNET_assert (h->submitted == NULL);
334 GNUNET_assert (size >= th->msize);
335 ret = th->get_message (th->get_message_cls, size, buf);
336 GNUNET_assert (ret <= size);
342 * Check the list of pending requests, send the next
346 trigger_next_request (struct GNUNET_CORE_Handle *h)
348 struct GNUNET_CORE_TransmitHandle *th;
350 if (h->currently_down)
351 return; /* connection temporarily down */
352 if (NULL == (th = h->pending_head))
353 return; /* no requests pending */
354 GNUNET_assert (NULL == h->th);
355 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
357 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
358 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
360 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
362 GNUNET_TIME_absolute_get_remaining
371 * Handler for notification messages received from the core.
373 * @param cls our "struct GNUNET_CORE_Handle"
374 * @param msg the message received from the core service
377 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
379 struct GNUNET_CORE_Handle *h = cls;
381 const struct ConnectNotifyMessage *cnm;
382 const struct DisconnectNotifyMessage *dnm;
383 const struct NotifyTrafficMessage *ntm;
384 const struct GNUNET_MessageHeader *em;
387 const struct GNUNET_CORE_MessageHandler *mh;
391 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
393 ("Client was disconnected from core service, trying to reconnect.\n"));
397 msize = ntohs (msg->size);
399 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
400 "Processing message of type %u and size %u from core service\n",
401 ntohs (msg->type), msize);
403 switch (ntohs (msg->type))
405 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT:
406 if (NULL == h->pre_connects)
411 if (msize != sizeof (struct ConnectNotifyMessage))
416 cnm = (const struct ConnectNotifyMessage *) msg;
417 h->pre_connects (h->cls,
419 GNUNET_TIME_relative_ntoh (cnm->latency),
420 ntohl (cnm->distance));
422 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
423 if (NULL == h->connects)
428 if (msize != sizeof (struct ConnectNotifyMessage))
433 cnm = (const struct ConnectNotifyMessage *) msg;
436 GNUNET_TIME_relative_ntoh (cnm->latency),
437 ntohl (cnm->distance));
439 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
440 if (NULL == h->disconnects)
445 if (msize != sizeof (struct DisconnectNotifyMessage))
450 dnm = (const struct DisconnectNotifyMessage *) msg;
451 h->disconnects (h->cls,
454 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
456 sizeof (struct NotifyTrafficMessage) +
457 sizeof (struct GNUNET_MessageHeader))
462 ntm = (const struct NotifyTrafficMessage *) msg;
463 em = (const struct GNUNET_MessageHeader *) &ntm[1];
465 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
466 "Received message of type %u from peer `%4s'\n",
467 ntohs (em->type), GNUNET_i2s (&ntm->peer));
469 if ((GNUNET_NO == h->inbound_hdr_only) &&
470 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
475 et = ntohs (em->type);
476 for (hpos = 0; hpos < h->hcnt; hpos++)
478 mh = &h->handlers[hpos];
481 if ((mh->expected_size != ntohs (em->size)) &&
482 (mh->expected_size != 0))
488 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
489 GNUNET_TIME_relative_ntoh (ntm->latency),
490 ntohl (ntm->distance)))
492 /* error in processing, disconnect ! */
497 if (NULL != h->inbound_notify)
498 h->inbound_notify (h->cls, &ntm->peer, em,
499 GNUNET_TIME_relative_ntoh (ntm->latency),
500 ntohl (ntm->distance));
502 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
504 sizeof (struct NotifyTrafficMessage) +
505 sizeof (struct GNUNET_MessageHeader))
510 ntm = (const struct NotifyTrafficMessage *) msg;
511 em = (const struct GNUNET_MessageHeader *) &ntm[1];
512 if ((GNUNET_NO == h->outbound_hdr_only) &&
513 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
518 if (NULL == h->outbound_notify)
523 h->outbound_notify (h->cls, &ntm->peer, em,
524 GNUNET_TIME_relative_ntoh (ntm->latency),
525 ntohl (ntm->distance));
531 GNUNET_CLIENT_receive (h->client_notifications,
532 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
537 * Function called when we are ready to transmit our
538 * "START" message (or when this operation timed out).
541 * @param size number of bytes available in buf
542 * @param buf where the callee should write the message
543 * @return number of bytes written to buf
545 static size_t transmit_start (void *cls, size_t size, void *buf);
549 * Function called on the first message received from
550 * the service (contains our public key, etc.).
551 * Should trigger calling the init callback
552 * and then start our regular message processing.
555 * @param msg message received, NULL on timeout or fatal error
558 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
560 struct GNUNET_CORE_Handle *h = cls;
561 const struct InitReplyMessage *m;
562 GNUNET_CORE_StartupCallback init;
563 struct GNUNET_PeerIdentity my_identity;
566 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
567 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
569 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
571 ("Error connecting to core service (failed to receive `%s' message).\n"),
573 GNUNET_break (msg == NULL);
574 transmit_start (h, 0, NULL);
577 m = (const struct InitReplyMessage *) msg;
578 /* start our message processing loop */
580 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
582 ("Successfully connected to core service, starting processing loop.\n"));
584 h->currently_down = GNUNET_NO;
585 trigger_next_request (h);
586 GNUNET_CLIENT_receive (h->client_notifications,
587 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
588 if (NULL != (init = h->init))
590 /* mark so we don't call init on reconnect */
593 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
594 _("Successfully connected to core service.\n"));
596 GNUNET_CRYPTO_hash (&m->publicKey,
598 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
599 &my_identity.hashPubKey);
600 init (h->cls, h, &my_identity, &m->publicKey);
606 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
608 struct GNUNET_CORE_Handle *h = cls;
609 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
615 * Function called when we are ready to transmit our
616 * "START" message (or when this operation timed out).
619 * @param size number of bytes available in buf
620 * @param buf where the callee should write the message
621 * @return number of bytes written to buf
624 transmit_start (void *cls, size_t size, void *buf)
626 struct GNUNET_CORE_Handle *h = cls;
627 struct InitMessage *init;
632 struct GNUNET_TIME_Relative delay;
637 if ((h->init == NULL) ||
638 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
640 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
641 _("Failed to connect to core service, retrying.\n"));
642 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
643 if ((h->init == NULL) || (delay.value > 1000))
644 delay = GNUNET_TIME_UNIT_SECONDS;
647 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
649 GNUNET_SCHEDULER_add_delayed (h->sched,
650 delay, &reconnect_task, h);
653 /* timeout on initial connect */
654 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
655 _("Failed to connect to core service, giving up.\n"));
656 h->init (h->cls, NULL, NULL, NULL);
657 GNUNET_CORE_disconnect (h);
660 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
661 GNUNET_assert (size >= msize);
663 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
664 init->header.size = htons (msize);
665 opt = GNUNET_CORE_OPTION_NOTHING;
666 if (h->pre_connects != NULL)
667 opt |= GNUNET_CORE_OPTION_SEND_PRE_CONNECT;
668 if (h->connects != NULL)
669 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
670 if (h->disconnects != NULL)
671 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
672 if (h->inbound_notify != NULL)
674 if (h->inbound_hdr_only)
675 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
677 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
679 if (h->outbound_notify != NULL)
681 if (h->outbound_hdr_only)
682 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
684 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
686 init->options = htonl (opt);
687 ts = (uint16_t *) & init[1];
688 for (hpos = 0; hpos < h->hcnt; hpos++)
689 ts[hpos] = htons (h->handlers[hpos].type);
690 GNUNET_CLIENT_receive (h->client_notifications,
693 GNUNET_TIME_absolute_get_remaining
694 (h->startup_timeout));
695 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
700 * Connect to the core service. Note that the connection may
701 * complete (or fail) asynchronously.
703 * @param sched scheduler to use
704 * @param cfg configuration to use
705 * @param timeout after how long should we give up trying to connect to the core service?
706 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
707 * @param init callback to call on timeout or once we have successfully
708 * connected to the core service; note that timeout is only meaningful if init is not NULL
709 * @param pre_connects function to call on peer pre-connect (no session key yet), can be NULL
710 * @param connects function to call on peer connect, can be NULL
711 * @param disconnects function to call on peer disconnect / timeout, can be NULL
712 * @param inbound_notify function to call for all inbound messages, can be NULL
713 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
714 * GNUNET_MessageHeader and hence we do not need to give it the full message;
715 * can be used to improve efficiency, ignored if inbound_notify is NULLL
716 * @param outbound_notify function to call for all outbound messages, can be NULL
717 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
718 * GNUNET_MessageHeader and hence we do not need to give it the full message
719 * can be used to improve efficiency, ignored if outbound_notify is NULLL
720 * @param handlers callbacks for messages we care about, NULL-terminated
721 * @return handle to the core service (only useful for disconnect until 'init' is called);
722 * NULL on error (in this case, init is never called)
724 struct GNUNET_CORE_Handle *
725 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
726 const struct GNUNET_CONFIGURATION_Handle *cfg,
727 struct GNUNET_TIME_Relative timeout,
729 GNUNET_CORE_StartupCallback init,
730 GNUNET_CORE_ConnectEventHandler pre_connects,
731 GNUNET_CORE_ConnectEventHandler connects,
732 GNUNET_CORE_DisconnectEventHandler disconnects,
733 GNUNET_CORE_MessageCallback inbound_notify,
734 int inbound_hdr_only,
735 GNUNET_CORE_MessageCallback outbound_notify,
736 int outbound_hdr_only,
737 const struct GNUNET_CORE_MessageHandler *handlers)
739 struct GNUNET_CORE_Handle *h;
741 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
746 h->pre_connects = pre_connects;
747 h->connects = connects;
748 h->disconnects = disconnects;
749 h->inbound_notify = inbound_notify;
750 h->outbound_notify = outbound_notify;
751 h->inbound_hdr_only = inbound_hdr_only;
752 h->outbound_hdr_only = outbound_hdr_only;
753 h->handlers = handlers;
754 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
755 if (h->client_notifications == NULL)
760 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
762 while (handlers[h->hcnt].callback != NULL)
764 GNUNET_assert (h->hcnt <
765 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
766 sizeof (struct InitMessage)) / sizeof (uint16_t));
768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
769 "Trying to connect to core service in next %llu ms.\n",
773 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
774 sizeof (struct InitMessage) +
775 sizeof (uint16_t) * h->hcnt, timeout,
783 * Disconnect from the core service.
785 * @param handle connection to core to disconnect
788 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
790 if (handle->th != NULL)
791 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
792 if (handle->solicit_transmit_req != NULL)
793 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
794 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
795 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
796 GNUNET_CLIENT_disconnect (handle->client_notifications);
797 GNUNET_free_non_null (handle->solicit_buffer);
798 GNUNET_free (handle);
803 * Build the message requesting data transmission.
806 produce_send (void *cls, size_t size, void *buf)
808 struct GNUNET_CORE_TransmitHandle *th = cls;
809 struct GNUNET_CORE_Handle *h;
810 struct SendMessage *sm;
812 GNUNET_CONNECTION_TransmitReadyNotify notify;
818 /* timeout or error */
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "P2P transmission request for `%4s' timed out.\n",
822 GNUNET_i2s(&th->peer));
824 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
825 GNUNET_CORE_notify_transmit_ready_cancel (th);
826 trigger_next_request (h);
830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
831 "Preparing for P2P transmission to `%4s'.\n",
832 GNUNET_i2s(&th->peer));
834 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
835 sm = (struct SendMessage *) buf;
836 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
837 sm->priority = htonl (th->priority);
838 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
841 notify_cls = th->notify_cls;
842 GNUNET_CORE_notify_transmit_ready_cancel (th);
843 trigger_next_request (h);
844 GNUNET_assert (size >= sizeof (struct SendMessage));
845 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
848 /* client decided to send nothing! */
851 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
852 sm->header.size = htons (dt + sizeof (struct SendMessage));
853 GNUNET_assert (dt + sizeof (struct SendMessage) < size);
854 return dt + sizeof (struct SendMessage);
859 * Ask the core to call "notify" once it is ready to transmit the
860 * given number of bytes to the specified "target". If we are not yet
861 * connected to the specified peer, a call to this function will cause
862 * us to try to establish a connection.
864 * @param handle connection to core service
865 * @param priority how important is the message?
866 * @param maxdelay how long can the message wait?
867 * @param target who should receive the message,
868 * use NULL for this peer (loopback)
869 * @param notify_size how many bytes of buffer space does notify want?
870 * @param notify function to call when buffer space is available
871 * @param notify_cls closure for notify
872 * @return non-NULL if the notify callback was queued,
873 * NULL if we can not even queue the request (insufficient
874 * memory); if NULL is returned, "notify" will NOT be called.
876 struct GNUNET_CORE_TransmitHandle *
877 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
878 unsigned int priority,
879 struct GNUNET_TIME_Relative maxdelay,
880 const struct GNUNET_PeerIdentity *target,
882 GNUNET_CONNECTION_TransmitReadyNotify notify,
885 struct GNUNET_CORE_TransmitHandle *th;
887 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
888 GNUNET_SERVER_MAX_MESSAGE_SIZE);
889 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
892 th->prev = handle->pending_tail;
893 if (handle->pending_tail == NULL)
894 handle->pending_head = th;
896 handle->pending_tail->next = th;
897 th->get_message = &produce_send;
898 th->get_message_cls = th;
900 th->notify_cls = notify_cls;
902 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
903 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
905 &timeout_request, th);
906 th->priority = priority;
907 th->msize = sizeof (struct SendMessage) + notify_size;
908 /* was the request queue previously empty? */
909 if ( (handle->pending_head == th) &&
910 (handle->th == NULL) )
911 trigger_next_request (handle);
917 * Cancel the specified transmission-ready notification.
919 * @param h handle that was returned by "notify_transmit_ready".
922 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
925 struct GNUNET_CORE_Handle *handle = h->ch;
927 if (handle->submitted == h)
929 handle->submitted = NULL;
934 handle->pending_head = h->next;
936 h->prev->next = h->next;
938 handle->pending_tail = h->prev;
940 h->next->prev = h->prev;
942 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
943 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
948 /* end of core_api.c */