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3 (C) 2009 Christian Grothoff (and other contributing authors)
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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.
61 GNUNET_CORE_ClientEventHandler connects;
64 * Function to call whenever we're notified about a peer disconnecting.
66 GNUNET_CORE_ClientEventHandler disconnects;
69 * Function to call whenever we receive an inbound message.
71 GNUNET_CORE_MessageCallback inbound_notify;
74 * Function to call whenever we receive an outbound message.
76 GNUNET_CORE_MessageCallback outbound_notify;
79 * Function handlers for messages of particular type.
81 const struct GNUNET_CORE_MessageHandler *handlers;
84 * Our connection to the service.
86 struct GNUNET_CLIENT_Connection *client;
89 * Handle for our current transmission request.
91 struct GNUNET_CLIENT_TransmitHandle *th;
94 * Head of doubly-linked list of pending requests.
96 struct GNUNET_CORE_TransmitHandle *pending_head;
99 * Tail of doubly-linked list of pending requests.
101 struct GNUNET_CORE_TransmitHandle *pending_tail;
104 * Currently submitted request (or NULL)
106 struct GNUNET_CORE_TransmitHandle *submitted;
109 * Currently submitted request based on solicitation (or NULL)
111 struct GNUNET_CORE_TransmitHandle *solicit_transmit_req;
114 * Buffer where we store a message for transmission in response
115 * to a traffic solicitation (or NULL).
117 char *solicit_buffer;
120 * How long to wait until we time out the connection attempt?
122 struct GNUNET_TIME_Absolute startup_timeout;
125 * ID of reconnect task (if any).
127 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
130 * Number of entries in the handlers array.
135 * For inbound notifications without a specific handler, do
136 * we expect to only receive headers?
138 int inbound_hdr_only;
141 * For outbound notifications without a specific handler, do
142 * we expect to only receive headers?
144 int outbound_hdr_only;
147 * Are we currently disconnected and hence unable to forward
155 * Handle for a transmission request.
157 struct GNUNET_CORE_TransmitHandle
161 * We keep active transmit handles in a doubly-linked list.
163 struct GNUNET_CORE_TransmitHandle *next;
166 * We keep active transmit handles in a doubly-linked list.
168 struct GNUNET_CORE_TransmitHandle *prev;
171 * Corresponding core handle.
173 struct GNUNET_CORE_Handle *ch;
176 * Function that will be called to get the actual request
177 * (once we are ready to transmit this request to the core).
178 * The function will be called with a NULL buffer to signal
181 GNUNET_CONNECTION_TransmitReadyNotify get_message;
184 * Closure for get_message.
186 void *get_message_cls;
189 * If this entry is for a configuration request, pointer
190 * to the information callback; otherwise NULL.
192 GNUNET_CORE_PeerConfigurationInfoCallback info;
200 * If this entry is for a transmission request, pointer
201 * to the notify callback; otherwise NULL.
203 GNUNET_CONNECTION_TransmitReadyNotify notify;
206 * Closure for notify.
211 * Peer the request is about.
213 struct GNUNET_PeerIdentity peer;
216 * Timeout for this handle.
218 struct GNUNET_TIME_Absolute timeout;
221 * ID of timeout task.
223 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
226 * How important is this message?
231 * Size of this request.
240 * Function called when we are ready to transmit our
241 * "START" message (or when this operation timed out).
244 * @param size number of bytes available in buf
245 * @param buf where the callee should write the message
246 * @return number of bytes written to buf
248 static size_t transmit_start (void *cls, size_t size, void *buf);
252 * Our current client connection went down. Clean it up
253 * and try to reconnect!
255 * @param h our handle to the core service
258 reconnect (struct GNUNET_CORE_Handle *h)
260 GNUNET_CLIENT_disconnect (h->client);
261 h->currently_down = GNUNET_YES;
262 h->client = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
263 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
264 sizeof (struct InitMessage) +
265 sizeof (uint16_t) * h->hcnt,
266 GNUNET_TIME_UNIT_SECONDS,
273 * The given request hit its timeout. Remove from the
274 * doubly-linked list and call the respective continuation.
276 * @param cls the transmit handle of the request that timed out
277 * @param tc context, can be NULL (!)
280 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
282 struct GNUNET_CORE_TransmitHandle *th = cls;
284 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
285 "Transmission request timed out.\n");
286 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
287 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
288 GNUNET_CORE_notify_transmit_ready_cancel (th);
293 * Function called when we are ready to transmit a request from our
294 * request list (or when this operation timed out).
297 * @param size number of bytes available in buf
298 * @param buf where the callee should write the message
299 * @return number of bytes written to buf
302 request_start (void *cls, size_t size, void *buf)
304 struct GNUNET_CORE_Handle *h = cls;
305 struct GNUNET_CORE_TransmitHandle *th;
309 th = h->pending_head;
312 timeout_request (th, NULL);
315 /* create new timeout task (in case core takes too long to respond!) */
316 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
317 GNUNET_TIME_absolute_get_remaining
319 &timeout_request, th);
320 /* remove th from doubly-linked pending list, move to submitted */
321 GNUNET_assert (th->prev == NULL);
322 h->pending_head = th->next;
323 if (th->next == NULL)
324 h->pending_tail = NULL;
326 th->next->prev = NULL;
327 GNUNET_assert (h->submitted == NULL);
329 GNUNET_assert (size >= th->msize);
330 ret = th->get_message (th->get_message_cls, size, buf);
331 GNUNET_assert (ret <= size);
337 * Check the list of pending requests, send the next
341 trigger_next_request (struct GNUNET_CORE_Handle *h)
343 struct GNUNET_CORE_TransmitHandle *th;
344 if (h->currently_down)
345 return; /* connection temporarily down */
346 if (NULL == (th = h->pending_head))
347 return; /* no requests pending */
348 GNUNET_assert (NULL == h->th);
349 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
351 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
352 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
354 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
356 GNUNET_TIME_absolute_get_remaining
365 * Handler for most messages received from the core.
367 * @param cls our "struct GNUNET_CORE_Handle"
368 * @param msg the message received from the core service
371 main_handler (void *cls, const struct GNUNET_MessageHeader *msg)
373 struct GNUNET_CORE_Handle *h = cls;
375 const struct ConnectNotifyMessage *cnm;
376 const struct NotifyTrafficMessage *ntm;
377 const struct ConfigurationInfoMessage *cim;
378 const struct GNUNET_MessageHeader *em;
381 const struct GNUNET_CORE_MessageHandler *mh;
385 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
387 ("Client was disconnected from core service, trying to reconnect.\n"));
391 msize = ntohs (msg->size);
393 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
394 "Processing message of type %u and size %u from core service\n",
395 ntohs (msg->type), msize);
397 switch (ntohs (msg->type))
399 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
400 if (NULL == h->connects)
405 if (msize != sizeof (struct ConnectNotifyMessage))
410 cnm = (const struct ConnectNotifyMessage *) msg;
414 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
415 if (NULL == h->disconnects)
420 if (msize != sizeof (struct ConnectNotifyMessage))
425 cnm = (const struct ConnectNotifyMessage *) msg;
426 h->disconnects (h->cls,
429 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
431 sizeof (struct NotifyTrafficMessage) +
432 sizeof (struct GNUNET_MessageHeader))
437 ntm = (const struct NotifyTrafficMessage *) msg;
438 em = (const struct GNUNET_MessageHeader *) &ntm[1];
440 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
441 "Received message of type %u from peer `%4s'\n",
442 ntohs (em->type), GNUNET_i2s (&ntm->peer));
444 if ((GNUNET_NO == h->inbound_hdr_only) &&
445 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
450 et = ntohs (em->type);
451 for (hpos = 0; hpos < h->hcnt; hpos++)
453 mh = &h->handlers[hpos];
456 if ((mh->expected_size != ntohs (em->size)) &&
457 (mh->expected_size != 0))
463 h->handlers[hpos].callback (h->cls, &ntm->peer, em))
465 /* error in processing, disconnect ! */
470 if (NULL != h->inbound_notify)
471 h->inbound_notify (h->cls, &ntm->peer, em);
473 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
475 sizeof (struct NotifyTrafficMessage) +
476 sizeof (struct GNUNET_MessageHeader))
481 ntm = (const struct NotifyTrafficMessage *) msg;
482 em = (const struct GNUNET_MessageHeader *) &ntm[1];
483 if ((GNUNET_NO == h->outbound_hdr_only) &&
484 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
489 if (NULL == h->outbound_notify)
494 h->outbound_notify (h->cls, &ntm->peer, em);
496 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
497 if (msize != sizeof (struct ConfigurationInfoMessage))
502 if (NULL == h->submitted)
504 cim = (const struct ConfigurationInfoMessage *) msg;
506 /* process configuration data */
507 if (h->submitted->info != NULL)
508 h->submitted->info (h->submitted->info_cls,
511 ntohl (cim->bpm_out),
512 GNUNET_TIME_relative_ntoh (cim->latency),
513 (int) ntohl (cim->reserved_amount),
515 /* done, clean up! */
516 GNUNET_CORE_notify_transmit_ready_cancel (h->submitted); // HUH?
517 trigger_next_request (h);
523 GNUNET_CLIENT_receive (h->client,
524 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
530 * Function called when we are ready to transmit our
531 * "START" message (or when this operation timed out).
534 * @param size number of bytes available in buf
535 * @param buf where the callee should write the message
536 * @return number of bytes written to buf
538 static size_t transmit_start (void *cls, size_t size, void *buf);
542 * Function called on the first message received from
543 * the service (contains our public key, etc.).
544 * Should trigger calling the init callback
545 * and then start our regular message processing.
548 * @param msg message received, NULL on timeout or fatal error
551 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
553 struct GNUNET_CORE_Handle *h = cls;
554 const struct InitReplyMessage *m;
555 GNUNET_CORE_StartupCallback init;
556 struct GNUNET_PeerIdentity my_identity;
559 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
560 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
562 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
564 ("Error connecting to core service (failed to receive `%s' message).\n"),
566 GNUNET_break (msg == NULL);
567 transmit_start (h, 0, NULL);
570 m = (const struct InitReplyMessage *) msg;
571 /* start our message processing loop */
573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
575 ("Successfully connected to core service, starting processing loop.\n"));
577 h->currently_down = GNUNET_NO;
578 trigger_next_request (h);
579 GNUNET_CLIENT_receive (h->client,
580 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
581 if (NULL != (init = h->init))
583 /* mark so we don't call init on reconnect */
586 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
587 _("Successfully connected to core service.\n"));
589 GNUNET_CRYPTO_hash (&m->publicKey,
591 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
592 &my_identity.hashPubKey);
593 init (h->cls, h, &my_identity, &m->publicKey);
599 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
601 struct GNUNET_CORE_Handle *h = cls;
602 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
608 * Function called when we are ready to transmit our
609 * "START" message (or when this operation timed out).
612 * @param size number of bytes available in buf
613 * @param buf where the callee should write the message
614 * @return number of bytes written to buf
617 transmit_start (void *cls, size_t size, void *buf)
619 struct GNUNET_CORE_Handle *h = cls;
620 struct InitMessage *init;
625 struct GNUNET_TIME_Relative delay;
630 if ((h->init == NULL) ||
631 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
633 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
634 _("Failed to connect to core service, retrying.\n"));
635 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
636 if ((h->init == NULL) || (delay.value > 1000))
637 delay = GNUNET_TIME_UNIT_SECONDS;
640 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
642 GNUNET_SCHEDULER_add_delayed (h->sched,
643 delay, &reconnect_task, h);
646 /* timeout on initial connect */
647 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
648 _("Failed to connect to core service, giving up.\n"));
649 h->init (h->cls, NULL, NULL, NULL);
650 GNUNET_CORE_disconnect (h);
653 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
654 GNUNET_assert (size >= msize);
656 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
657 init->header.size = htons (msize);
658 opt = GNUNET_CORE_OPTION_NOTHING;
659 if (h->connects != NULL)
660 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
661 if (h->disconnects != NULL)
662 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
663 if (h->inbound_notify != NULL)
665 if (h->inbound_hdr_only)
666 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
668 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
670 if (h->outbound_notify != NULL)
672 if (h->outbound_hdr_only)
673 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
675 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
677 init->options = htonl (opt);
678 ts = (uint16_t *) & init[1];
679 for (hpos = 0; hpos < h->hcnt; hpos++)
680 ts[hpos] = htons (h->handlers[hpos].type);
681 GNUNET_CLIENT_receive (h->client,
684 GNUNET_TIME_absolute_get_remaining
685 (h->startup_timeout));
686 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
691 * Connect to the core service. Note that the connection may
692 * complete (or fail) asynchronously.
694 * @param sched scheduler to use
695 * @param cfg configuration to use
696 * @param timeout after how long should we give up trying to connect to the core service?
697 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
698 * @param init callback to call on timeout or once we have successfully
699 * connected to the core service; note that timeout is only meaningful if init is not NULL
700 * @param connects function to call on peer connect, can be NULL
701 * @param disconnects function to call on peer disconnect / timeout, can be NULL
702 * @param inbound_notify function to call for all inbound messages, can be NULL
703 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
704 * GNUNET_MessageHeader and hence we do not need to give it the full message;
705 * can be used to improve efficiency, ignored if inbound_notify is NULLL
706 * @param outbound_notify function to call for all outbound messages, can be NULL
707 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
708 * GNUNET_MessageHeader and hence we do not need to give it the full message
709 * can be used to improve efficiency, ignored if outbound_notify is NULLL
710 * @param handlers callbacks for messages we care about, NULL-terminated
711 * @return handle to the core service (only useful for disconnect until 'init' is called);
712 * NULL on error (in this case, init is never called)
714 struct GNUNET_CORE_Handle *
715 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
716 const struct GNUNET_CONFIGURATION_Handle *cfg,
717 struct GNUNET_TIME_Relative timeout,
719 GNUNET_CORE_StartupCallback init,
720 GNUNET_CORE_ClientEventHandler connects,
721 GNUNET_CORE_ClientEventHandler disconnects,
722 GNUNET_CORE_MessageCallback inbound_notify,
723 int inbound_hdr_only,
724 GNUNET_CORE_MessageCallback outbound_notify,
725 int outbound_hdr_only,
726 const struct GNUNET_CORE_MessageHandler *handlers)
728 struct GNUNET_CORE_Handle *h;
730 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
735 h->connects = connects;
736 h->disconnects = disconnects;
737 h->inbound_notify = inbound_notify;
738 h->outbound_notify = outbound_notify;
739 h->inbound_hdr_only = inbound_hdr_only;
740 h->outbound_hdr_only = outbound_hdr_only;
741 h->handlers = handlers;
742 h->client = GNUNET_CLIENT_connect (sched, "core", cfg);
743 if (h->client == NULL)
748 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
750 while (handlers[h->hcnt].callback != NULL)
752 GNUNET_assert (h->hcnt <
753 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
754 sizeof (struct InitMessage)) / sizeof (uint16_t));
756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
757 "Trying to connect to core service in next %llu ms.\n",
761 GNUNET_CLIENT_notify_transmit_ready (h->client,
762 sizeof (struct InitMessage) +
763 sizeof (uint16_t) * h->hcnt, timeout,
771 * Disconnect from the core service.
773 * @param handle connection to core to disconnect
776 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
778 if (handle->th != NULL)
779 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
780 if (handle->solicit_transmit_req != NULL)
781 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
782 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
783 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
784 GNUNET_CLIENT_disconnect (handle->client);
785 GNUNET_free_non_null (handle->solicit_buffer);
786 GNUNET_free (handle);
791 * Build the message requesting data transmission.
794 produce_send (void *cls, size_t size, void *buf)
796 struct GNUNET_CORE_TransmitHandle *th = cls;
797 struct GNUNET_CORE_Handle *h;
798 struct SendMessage *sm;
800 GNUNET_CONNECTION_TransmitReadyNotify notify;
806 /* timeout or error */
808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
809 "P2P transmission request for `%4s' timed out.\n",
810 GNUNET_i2s(&th->peer));
812 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
813 GNUNET_CORE_notify_transmit_ready_cancel (th);
814 trigger_next_request (h);
818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
819 "Preparing for P2P transmission to `%4s'.\n",
820 GNUNET_i2s(&th->peer));
822 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
823 sm = (struct SendMessage *) buf;
824 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
825 sm->priority = htonl (th->priority);
826 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
829 notify_cls = th->notify_cls;
830 GNUNET_CORE_notify_transmit_ready_cancel (th);
831 trigger_next_request (h);
832 GNUNET_assert (size >= sizeof (struct SendMessage));
833 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
836 /* client decided to send nothing! */
839 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
840 sm->header.size = htons (dt + sizeof (struct SendMessage));
841 GNUNET_assert (dt + sizeof (struct SendMessage) < size);
842 return dt + sizeof (struct SendMessage);
847 * Ask the core to call "notify" once it is ready to transmit the
848 * given number of bytes to the specified "target". If we are not yet
849 * connected to the specified peer, a call to this function will cause
850 * us to try to establish a connection.
852 * @param handle connection to core service
853 * @param priority how important is the message?
854 * @param maxdelay how long can the message wait?
855 * @param target who should receive the message,
856 * use NULL for this peer (loopback)
857 * @param notify_size how many bytes of buffer space does notify want?
858 * @param notify function to call when buffer space is available
859 * @param notify_cls closure for notify
860 * @return non-NULL if the notify callback was queued,
861 * NULL if we can not even queue the request (insufficient
862 * memory); if NULL is returned, "notify" will NOT be called.
864 struct GNUNET_CORE_TransmitHandle *
865 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
866 unsigned int priority,
867 struct GNUNET_TIME_Relative maxdelay,
868 const struct GNUNET_PeerIdentity *target,
870 GNUNET_CONNECTION_TransmitReadyNotify notify,
873 struct GNUNET_CORE_TransmitHandle *th;
875 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
876 GNUNET_SERVER_MAX_MESSAGE_SIZE);
877 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
880 th->prev = handle->pending_tail;
881 if (handle->pending_tail == NULL)
882 handle->pending_head = th;
884 handle->pending_tail->next = th;
885 th->get_message = &produce_send;
886 th->get_message_cls = th;
888 th->notify_cls = notify_cls;
890 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
891 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
893 &timeout_request, th);
894 th->priority = priority;
895 th->msize = sizeof (struct SendMessage) + notify_size;
896 /* was the request queue previously empty? */
897 if ( (handle->pending_head == th) &&
898 (handle->th == NULL) )
899 trigger_next_request (handle);
905 * Cancel the specified transmission-ready notification.
907 * @param h handle that was returned by "notify_transmit_ready".
910 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
913 struct GNUNET_CORE_Handle *handle = h->ch;
915 if (handle->submitted == h)
917 handle->submitted = NULL;
922 handle->pending_head = h->next;
924 h->prev->next = h->next;
926 handle->pending_tail = h->prev;
928 h->next->prev = h->prev;
930 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
931 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
936 /* end of core_api.c */