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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 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
350 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
351 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
353 GNUNET_TIME_absolute_get_remaining
362 * Handler for most messages received from the core.
364 * @param cls our "struct GNUNET_CORE_Handle"
365 * @param msg the message received from the core service
368 main_handler (void *cls, const struct GNUNET_MessageHeader *msg)
370 struct GNUNET_CORE_Handle *h = cls;
372 const struct ConnectNotifyMessage *cnm;
373 const struct NotifyTrafficMessage *ntm;
374 const struct ConfigurationInfoMessage *cim;
375 const struct GNUNET_MessageHeader *em;
378 const struct GNUNET_CORE_MessageHandler *mh;
382 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
384 ("Client was disconnected from core service, trying to reconnect.\n"));
388 msize = ntohs (msg->size);
390 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
391 "Processing message of type %u and size %u from core service\n",
392 ntohs (msg->type), msize);
394 switch (ntohs (msg->type))
396 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
397 if (NULL == h->connects)
402 if (msize != sizeof (struct ConnectNotifyMessage))
407 cnm = (const struct ConnectNotifyMessage *) msg;
411 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
412 if (NULL == h->disconnects)
417 if (msize != sizeof (struct ConnectNotifyMessage))
422 cnm = (const struct ConnectNotifyMessage *) msg;
423 h->disconnects (h->cls,
426 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
428 sizeof (struct NotifyTrafficMessage) +
429 sizeof (struct GNUNET_MessageHeader))
434 ntm = (const struct NotifyTrafficMessage *) msg;
435 em = (const struct GNUNET_MessageHeader *) &ntm[1];
437 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
438 "Received message of type %u from peer `%4s'\n",
439 ntohs (em->type), GNUNET_i2s (&ntm->peer));
441 if ((GNUNET_NO == h->inbound_hdr_only) &&
442 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
447 et = ntohs (em->type);
448 for (hpos = 0; hpos < h->hcnt; hpos++)
450 mh = &h->handlers[hpos];
453 if ((mh->expected_size != ntohs (em->size)) &&
454 (mh->expected_size != 0))
460 h->handlers[hpos].callback (h->cls, &ntm->peer, em))
462 /* error in processing, disconnect ! */
467 if (NULL != h->inbound_notify)
468 h->inbound_notify (h->cls, &ntm->peer, em);
470 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
472 sizeof (struct NotifyTrafficMessage) +
473 sizeof (struct GNUNET_MessageHeader))
478 ntm = (const struct NotifyTrafficMessage *) msg;
479 em = (const struct GNUNET_MessageHeader *) &ntm[1];
480 if ((GNUNET_NO == h->outbound_hdr_only) &&
481 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
486 if (NULL == h->outbound_notify)
491 h->outbound_notify (h->cls, &ntm->peer, em);
493 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
494 if (msize != sizeof (struct ConfigurationInfoMessage))
499 if (NULL == h->submitted)
501 cim = (const struct ConfigurationInfoMessage *) msg;
503 /* process configuration data */
504 if (h->submitted->info != NULL)
505 h->submitted->info (h->submitted->info_cls,
508 ntohl (cim->bpm_out),
509 GNUNET_TIME_relative_ntoh (cim->latency),
510 (int) ntohl (cim->reserved_amount),
512 /* done, clean up! */
513 GNUNET_CORE_notify_transmit_ready_cancel (h->submitted); // HUH?
514 trigger_next_request (h);
520 GNUNET_CLIENT_receive (h->client,
521 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
527 * Function called when we are ready to transmit our
528 * "START" message (or when this operation timed out).
531 * @param size number of bytes available in buf
532 * @param buf where the callee should write the message
533 * @return number of bytes written to buf
535 static size_t transmit_start (void *cls, size_t size, void *buf);
539 * Function called on the first message received from
540 * the service (contains our public key, etc.).
541 * Should trigger calling the init callback
542 * and then start our regular message processing.
545 * @param msg message received, NULL on timeout or fatal error
548 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
550 struct GNUNET_CORE_Handle *h = cls;
551 const struct InitReplyMessage *m;
552 GNUNET_CORE_StartupCallback init;
553 struct GNUNET_PeerIdentity my_identity;
556 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
557 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
559 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
561 ("Error connecting to core service (failed to receive `%s' message).\n"),
563 GNUNET_break (msg == NULL);
564 transmit_start (h, 0, NULL);
567 m = (const struct InitReplyMessage *) msg;
568 /* start our message processing loop */
570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
572 ("Successfully connected to core service, starting processing loop.\n"));
574 h->currently_down = GNUNET_NO;
575 trigger_next_request (h);
576 GNUNET_CLIENT_receive (h->client,
577 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
578 if (NULL != (init = h->init))
580 /* mark so we don't call init on reconnect */
583 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
584 _("Successfully connected to core service.\n"));
586 GNUNET_CRYPTO_hash (&m->publicKey,
588 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
589 &my_identity.hashPubKey);
590 init (h->cls, h, &my_identity, &m->publicKey);
596 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
598 struct GNUNET_CORE_Handle *h = cls;
599 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
605 * Function called when we are ready to transmit our
606 * "START" message (or when this operation timed out).
609 * @param size number of bytes available in buf
610 * @param buf where the callee should write the message
611 * @return number of bytes written to buf
614 transmit_start (void *cls, size_t size, void *buf)
616 struct GNUNET_CORE_Handle *h = cls;
617 struct InitMessage *init;
622 struct GNUNET_TIME_Relative delay;
627 if ((h->init == NULL) ||
628 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
630 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
631 _("Failed to connect to core service, retrying.\n"));
632 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
633 if ((h->init == NULL) || (delay.value > 1000))
634 delay = GNUNET_TIME_UNIT_SECONDS;
637 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
639 GNUNET_SCHEDULER_add_delayed (h->sched,
640 delay, &reconnect_task, h);
643 /* timeout on initial connect */
644 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
645 _("Failed to connect to core service, giving up.\n"));
646 h->init (h->cls, NULL, NULL, NULL);
647 GNUNET_CORE_disconnect (h);
650 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
651 GNUNET_assert (size >= msize);
653 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
654 init->header.size = htons (msize);
655 opt = GNUNET_CORE_OPTION_NOTHING;
656 if (h->connects != NULL)
657 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
658 if (h->disconnects != NULL)
659 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
660 if (h->inbound_notify != NULL)
662 if (h->inbound_hdr_only)
663 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
665 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
667 if (h->outbound_notify != NULL)
669 if (h->outbound_hdr_only)
670 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
672 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
674 init->options = htonl (opt);
675 ts = (uint16_t *) & init[1];
676 for (hpos = 0; hpos < h->hcnt; hpos++)
677 ts[hpos] = htons (h->handlers[hpos].type);
678 GNUNET_CLIENT_receive (h->client,
681 GNUNET_TIME_absolute_get_remaining
682 (h->startup_timeout));
683 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
688 * Connect to the core service. Note that the connection may
689 * complete (or fail) asynchronously.
691 * @param sched scheduler to use
692 * @param cfg configuration to use
693 * @param timeout after how long should we give up trying to connect to the core service?
694 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
695 * @param init callback to call on timeout or once we have successfully
696 * connected to the core service; note that timeout is only meaningful if init is not NULL
697 * @param connects function to call on peer connect, can be NULL
698 * @param disconnects function to call on peer disconnect / timeout, can be NULL
699 * @param inbound_notify function to call for all inbound messages, can be NULL
700 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
701 * GNUNET_MessageHeader and hence we do not need to give it the full message;
702 * can be used to improve efficiency, ignored if inbound_notify is NULLL
703 * @param outbound_notify function to call for all outbound messages, can be NULL
704 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
705 * GNUNET_MessageHeader and hence we do not need to give it the full message
706 * can be used to improve efficiency, ignored if outbound_notify is NULLL
707 * @param handlers callbacks for messages we care about, NULL-terminated
708 * @return handle to the core service (only useful for disconnect until 'init' is called);
709 * NULL on error (in this case, init is never called)
711 struct GNUNET_CORE_Handle *
712 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
713 const struct GNUNET_CONFIGURATION_Handle *cfg,
714 struct GNUNET_TIME_Relative timeout,
716 GNUNET_CORE_StartupCallback init,
717 GNUNET_CORE_ClientEventHandler connects,
718 GNUNET_CORE_ClientEventHandler disconnects,
719 GNUNET_CORE_MessageCallback inbound_notify,
720 int inbound_hdr_only,
721 GNUNET_CORE_MessageCallback outbound_notify,
722 int outbound_hdr_only,
723 const struct GNUNET_CORE_MessageHandler *handlers)
725 struct GNUNET_CORE_Handle *h;
727 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
732 h->connects = connects;
733 h->disconnects = disconnects;
734 h->inbound_notify = inbound_notify;
735 h->outbound_notify = outbound_notify;
736 h->inbound_hdr_only = inbound_hdr_only;
737 h->outbound_hdr_only = outbound_hdr_only;
738 h->handlers = handlers;
739 h->client = GNUNET_CLIENT_connect (sched, "core", cfg);
740 if (h->client == NULL)
745 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
747 while (handlers[h->hcnt].callback != NULL)
749 GNUNET_assert (h->hcnt <
750 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
751 sizeof (struct InitMessage)) / sizeof (uint16_t));
753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
754 "Trying to connect to core service in next %llu ms.\n",
758 GNUNET_CLIENT_notify_transmit_ready (h->client,
759 sizeof (struct InitMessage) +
760 sizeof (uint16_t) * h->hcnt, timeout,
768 * Disconnect from the core service.
770 * @param handle connection to core to disconnect
773 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
775 if (handle->th != NULL)
776 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
777 if (handle->solicit_transmit_req != NULL)
778 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
779 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
780 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
781 GNUNET_CLIENT_disconnect (handle->client);
782 GNUNET_free_non_null (handle->solicit_buffer);
783 GNUNET_free (handle);
788 * Build the message requesting data transmission.
791 produce_send (void *cls, size_t size, void *buf)
793 struct GNUNET_CORE_TransmitHandle *th = cls;
794 struct GNUNET_CORE_Handle *h;
795 struct SendMessage *sm;
797 GNUNET_CONNECTION_TransmitReadyNotify notify;
803 /* timeout or error */
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
806 "P2P transmission request for `%4s' timed out.\n",
807 GNUNET_i2s(&th->peer));
809 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
810 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
811 GNUNET_CORE_notify_transmit_ready_cancel (th);
812 trigger_next_request (h);
816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
817 "Preparing for P2P transmission to `%4s'.\n",
818 GNUNET_i2s(&th->peer));
820 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
821 sm = (struct SendMessage *) buf;
822 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
823 sm->priority = htonl (th->priority);
824 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
827 notify_cls = th->notify_cls;
828 GNUNET_CORE_notify_transmit_ready_cancel (th);
829 trigger_next_request (h);
830 GNUNET_assert (size >= sizeof (struct SendMessage));
831 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
834 /* client decided to send nothing! */
837 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
838 sm->header.size = htons (dt + sizeof (struct SendMessage));
839 GNUNET_assert (dt + sizeof (struct SendMessage) < size);
840 return dt + sizeof (struct SendMessage);
845 * Ask the core to call "notify" once it is ready to transmit the
846 * given number of bytes to the specified "target". If we are not yet
847 * connected to the specified peer, a call to this function will cause
848 * us to try to establish a connection.
850 * @param handle connection to core service
851 * @param priority how important is the message?
852 * @param maxdelay how long can the message wait?
853 * @param target who should receive the message,
854 * use NULL for this peer (loopback)
855 * @param notify_size how many bytes of buffer space does notify want?
856 * @param notify function to call when buffer space is available
857 * @param notify_cls closure for notify
858 * @return non-NULL if the notify callback was queued,
859 * NULL if we can not even queue the request (insufficient
860 * memory); if NULL is returned, "notify" will NOT be called.
862 struct GNUNET_CORE_TransmitHandle *
863 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
864 unsigned int priority,
865 struct GNUNET_TIME_Relative maxdelay,
866 const struct GNUNET_PeerIdentity *target,
868 GNUNET_CONNECTION_TransmitReadyNotify notify,
871 struct GNUNET_CORE_TransmitHandle *th;
873 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
874 GNUNET_SERVER_MAX_MESSAGE_SIZE);
875 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
878 th->prev = handle->pending_tail;
879 if (handle->pending_tail == NULL)
880 handle->pending_head = th;
882 handle->pending_tail->next = th;
883 th->get_message = &produce_send;
884 th->get_message_cls = th;
886 th->notify_cls = notify_cls;
888 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
889 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
891 &timeout_request, th);
892 th->priority = priority;
893 th->msize = sizeof (struct SendMessage) + notify_size;
894 /* was the request queue previously empty? */
895 if ( (handle->pending_head == th) &&
896 (handle->th == NULL) )
897 trigger_next_request (handle);
903 * Cancel the specified transmission-ready notification.
905 * @param h handle that was returned by "notify_transmit_ready".
908 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
911 struct GNUNET_CORE_Handle *handle = h->ch;
913 if (handle->submitted == h)
915 handle->submitted = NULL;
920 handle->pending_head = h->next;
922 h->prev->next = h->next;
924 handle->pending_tail = h->prev;
926 h->next->prev = h->prev;
928 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
929 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
934 /* end of core_api.c */