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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_ConnectEventHandler connects;
64 * Function to call whenever we're notified about a peer disconnecting.
66 GNUNET_CORE_DisconnectEventHandler 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 for notifications.
86 struct GNUNET_CLIENT_Connection *client_notifications;
89 * Handle for our current transmission request.
91 struct GNUNET_CLIENT_TransmitHandle *cth;
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 transmission request, pointer
190 * to the notify callback; otherwise NULL.
192 GNUNET_CONNECTION_TransmitReadyNotify notify;
195 * Closure for notify.
200 * Peer the request is about.
202 struct GNUNET_PeerIdentity peer;
205 * Timeout for this handle.
207 struct GNUNET_TIME_Absolute timeout;
210 * ID of timeout task.
212 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
215 * How important is this message?
220 * Size of this request.
229 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
233 * Function called when we are ready to transmit our
234 * "START" message (or when this operation timed out).
237 * @param size number of bytes available in buf
238 * @param buf where the callee should write the message
239 * @return number of bytes written to buf
241 static size_t transmit_start (void *cls, size_t size, void *buf);
245 * Our current client connection went down. Clean it up
246 * and try to reconnect!
248 * @param h our handle to the core service
251 reconnect (struct GNUNET_CORE_Handle *h)
253 if (h->client_notifications != NULL)
254 GNUNET_CLIENT_disconnect (h->client_notifications, GNUNET_NO);
255 h->currently_down = GNUNET_YES;
256 h->client_notifications = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
257 if (h->client_notifications == NULL)
258 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->sched,
259 GNUNET_TIME_UNIT_SECONDS,
263 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
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 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
285 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
290 * Function called when we are ready to transmit a request from our
291 * request list (or when this operation timed out).
294 * @param size number of bytes available in buf
295 * @param buf where the callee should write the message
296 * @return number of bytes written to buf
299 request_start (void *cls, size_t size, void *buf)
301 struct GNUNET_CORE_Handle *h = cls;
302 struct GNUNET_CORE_TransmitHandle *th;
306 th = h->pending_head;
309 timeout_request (th, NULL);
312 GNUNET_CONTAINER_DLL_remove (h->pending_head,
315 GNUNET_assert (h->submitted == NULL);
317 GNUNET_assert (size >= th->msize);
318 ret = th->get_message (th->get_message_cls, size, buf);
319 GNUNET_assert (ret <= size);
325 * Check the list of pending requests, send the next
329 trigger_next_request (struct GNUNET_CORE_Handle *h)
331 struct GNUNET_CORE_TransmitHandle *th;
333 if (h->currently_down)
336 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
337 "In trigger_next_request, connection currently down...\n");
339 return; /* connection temporarily down */
341 if (NULL == (th = h->pending_head))
342 return; /* no requests pending */
343 GNUNET_assert (NULL == h->cth);
344 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
346 GNUNET_TIME_absolute_get_remaining
355 * Handler for notification messages received from the core.
357 * @param cls our "struct GNUNET_CORE_Handle"
358 * @param msg the message received from the core service
361 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
363 struct GNUNET_CORE_Handle *h = cls;
365 const struct ConnectNotifyMessage *cnm;
366 const struct DisconnectNotifyMessage *dnm;
367 const struct NotifyTrafficMessage *ntm;
368 const struct GNUNET_MessageHeader *em;
371 const struct GNUNET_CORE_MessageHandler *mh;
375 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
377 ("Client was disconnected from core service, trying to reconnect.\n"));
381 msize = ntohs (msg->size);
383 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
384 "Processing message of type %u and size %u from core service\n",
385 ntohs (msg->type), msize);
387 switch (ntohs (msg->type))
389 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
390 if (NULL == h->connects)
395 if (msize != sizeof (struct ConnectNotifyMessage))
400 cnm = (const struct ConnectNotifyMessage *) msg;
403 GNUNET_TIME_relative_ntoh (cnm->latency),
404 ntohl (cnm->distance));
406 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
407 if (NULL == h->disconnects)
412 if (msize != sizeof (struct DisconnectNotifyMessage))
417 dnm = (const struct DisconnectNotifyMessage *) msg;
418 h->disconnects (h->cls,
421 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
423 sizeof (struct NotifyTrafficMessage) +
424 sizeof (struct GNUNET_MessageHeader))
429 ntm = (const struct NotifyTrafficMessage *) msg;
430 em = (const struct GNUNET_MessageHeader *) &ntm[1];
432 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
433 "Received message of type %u from peer `%4s'\n",
434 ntohs (em->type), GNUNET_i2s (&ntm->peer));
436 if ((GNUNET_NO == h->inbound_hdr_only) &&
437 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
442 et = ntohs (em->type);
443 for (hpos = 0; hpos < h->hcnt; hpos++)
445 mh = &h->handlers[hpos];
448 if ((mh->expected_size != ntohs (em->size)) &&
449 (mh->expected_size != 0))
455 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
456 GNUNET_TIME_relative_ntoh (ntm->latency),
457 ntohl (ntm->distance)))
459 /* error in processing, disconnect ! */
464 if (NULL != h->inbound_notify)
465 h->inbound_notify (h->cls, &ntm->peer, em,
466 GNUNET_TIME_relative_ntoh (ntm->latency),
467 ntohl (ntm->distance));
469 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
471 sizeof (struct NotifyTrafficMessage) +
472 sizeof (struct GNUNET_MessageHeader))
477 ntm = (const struct NotifyTrafficMessage *) msg;
478 em = (const struct GNUNET_MessageHeader *) &ntm[1];
479 if ((GNUNET_NO == h->outbound_hdr_only) &&
480 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
485 if (NULL == h->outbound_notify)
490 h->outbound_notify (h->cls, &ntm->peer, em,
491 GNUNET_TIME_relative_ntoh (ntm->latency),
492 ntohl (ntm->distance));
498 GNUNET_CLIENT_receive (h->client_notifications,
499 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
504 * Function called when we are ready to transmit our
505 * "START" message (or when this operation timed out).
508 * @param size number of bytes available in buf
509 * @param buf where the callee should write the message
510 * @return number of bytes written to buf
512 static size_t transmit_start (void *cls, size_t size, void *buf);
516 * Function called on the first message received from
517 * the service (contains our public key, etc.).
518 * Should trigger calling the init callback
519 * and then start our regular message processing.
522 * @param msg message received, NULL on timeout or fatal error
525 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
527 struct GNUNET_CORE_Handle *h = cls;
528 const struct InitReplyMessage *m;
529 GNUNET_CORE_StartupCallback init;
530 struct GNUNET_PeerIdentity my_identity;
533 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
534 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
538 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
540 ("Error connecting to core service (failed to receive `%s' message, got message of type %u and size %u).\n"),
549 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
550 _("Failed to connect to core service, will retry.\n"));
553 transmit_start (h, 0, NULL);
556 m = (const struct InitReplyMessage *) msg;
557 /* start our message processing loop */
559 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
560 "Successfully connected to core service, starting processing loop.\n");
562 h->currently_down = GNUNET_NO;
563 trigger_next_request (h);
564 GNUNET_CLIENT_receive (h->client_notifications,
565 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
566 if (NULL != (init = h->init))
568 /* mark so we don't call init on reconnect */
570 GNUNET_CRYPTO_hash (&m->publicKey,
572 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
573 &my_identity.hashPubKey);
574 init (h->cls, h, &my_identity, &m->publicKey);
580 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
582 struct GNUNET_CORE_Handle *h = cls;
583 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
589 * Function called when we are ready to transmit our
590 * "START" message (or when this operation timed out).
593 * @param size number of bytes available in buf
594 * @param buf where the callee should write the message
595 * @return number of bytes written to buf
598 transmit_start (void *cls, size_t size, void *buf)
600 struct GNUNET_CORE_Handle *h = cls;
601 struct InitMessage *init;
606 struct GNUNET_TIME_Relative delay;
611 if ((h->init == NULL) ||
612 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
614 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
615 _("Failed to connect to core service, retrying.\n"));
616 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
617 if ((h->init == NULL) || (delay.value > 1000))
618 delay = GNUNET_TIME_UNIT_SECONDS;
621 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
623 GNUNET_SCHEDULER_add_delayed (h->sched,
624 delay, &reconnect_task, h);
627 /* timeout on initial connect */
628 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
629 _("Failed to connect to core service, giving up.\n"));
630 h->init (h->cls, NULL, NULL, NULL);
631 GNUNET_CORE_disconnect (h);
634 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
635 GNUNET_assert (size >= msize);
637 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
638 init->header.size = htons (msize);
639 opt = GNUNET_CORE_OPTION_NOTHING;
640 if (h->connects != NULL)
641 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
642 if (h->disconnects != NULL)
643 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
644 if (h->inbound_notify != NULL)
646 if (h->inbound_hdr_only)
647 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
649 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
651 if (h->outbound_notify != NULL)
653 if (h->outbound_hdr_only)
654 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
656 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
658 init->options = htonl (opt);
659 ts = (uint16_t *) & init[1];
660 for (hpos = 0; hpos < h->hcnt; hpos++)
661 ts[hpos] = htons (h->handlers[hpos].type);
662 GNUNET_CLIENT_receive (h->client_notifications,
665 GNUNET_TIME_absolute_get_remaining
666 (h->startup_timeout));
667 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
672 * Connect to the core service. Note that the connection may
673 * complete (or fail) asynchronously.
675 * @param sched scheduler to use
676 * @param cfg configuration to use
677 * @param timeout after how long should we give up trying to connect to the core service?
678 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
679 * @param init callback to call on timeout or once we have successfully
680 * connected to the core service; note that timeout is only meaningful if init is not NULL
681 * @param connects function to call on peer connect, can be NULL
682 * @param disconnects function to call on peer disconnect / timeout, can be NULL
683 * @param inbound_notify function to call for all inbound messages, can be NULL
684 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
685 * GNUNET_MessageHeader and hence we do not need to give it the full message;
686 * can be used to improve efficiency, ignored if inbound_notify is NULLL
687 * @param outbound_notify function to call for all outbound messages, can be NULL
688 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
689 * GNUNET_MessageHeader and hence we do not need to give it the full message
690 * can be used to improve efficiency, ignored if outbound_notify is NULLL
691 * @param handlers callbacks for messages we care about, NULL-terminated
692 * @return handle to the core service (only useful for disconnect until 'init' is called);
693 * NULL on error (in this case, init is never called)
695 struct GNUNET_CORE_Handle *
696 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
697 const struct GNUNET_CONFIGURATION_Handle *cfg,
698 struct GNUNET_TIME_Relative timeout,
700 GNUNET_CORE_StartupCallback init,
701 GNUNET_CORE_ConnectEventHandler connects,
702 GNUNET_CORE_DisconnectEventHandler disconnects,
703 GNUNET_CORE_MessageCallback inbound_notify,
704 int inbound_hdr_only,
705 GNUNET_CORE_MessageCallback outbound_notify,
706 int outbound_hdr_only,
707 const struct GNUNET_CORE_MessageHandler *handlers)
709 struct GNUNET_CORE_Handle *h;
711 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
716 h->connects = connects;
717 h->disconnects = disconnects;
718 h->inbound_notify = inbound_notify;
719 h->outbound_notify = outbound_notify;
720 h->inbound_hdr_only = inbound_hdr_only;
721 h->outbound_hdr_only = outbound_hdr_only;
722 h->handlers = handlers;
723 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
724 if (h->client_notifications == NULL)
729 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
731 while (handlers[h->hcnt].callback != NULL)
733 GNUNET_assert (h->hcnt <
734 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
735 sizeof (struct InitMessage)) / sizeof (uint16_t));
737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
738 "Trying to connect to core service in next %llu ms.\n",
742 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
743 sizeof (struct InitMessage) +
744 sizeof (uint16_t) * h->hcnt, timeout,
752 * Disconnect from the core service.
754 * @param handle connection to core to disconnect
757 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
759 if (handle->cth != NULL)
760 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
761 if (handle->solicit_transmit_req != NULL)
762 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
763 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
764 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
765 if (handle->client_notifications != NULL)
766 GNUNET_CLIENT_disconnect (handle->client_notifications, GNUNET_NO);
767 GNUNET_free_non_null (handle->solicit_buffer);
768 GNUNET_free (handle);
773 * Build the message requesting data transmission.
776 produce_send (void *cls, size_t size, void *buf)
778 struct GNUNET_CORE_TransmitHandle *th = cls;
779 struct GNUNET_CORE_Handle *h;
780 struct SendMessage *sm;
782 GNUNET_CONNECTION_TransmitReadyNotify notify;
788 /* timeout or error */
790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
791 "P2P transmission request for `%4s' timed out.\n",
792 GNUNET_i2s(&th->peer));
794 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
795 GNUNET_CORE_notify_transmit_ready_cancel (th);
796 trigger_next_request (h);
800 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
801 "Preparing for P2P transmission to `%4s'.\n",
802 GNUNET_i2s(&th->peer));
804 sm = (struct SendMessage *) buf;
805 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
806 sm->priority = htonl (th->priority);
807 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
810 notify_cls = th->notify_cls;
811 GNUNET_CORE_notify_transmit_ready_cancel (th);
812 trigger_next_request (h);
813 GNUNET_assert (size >= sizeof (struct SendMessage));
814 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
818 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
819 "Size of clients message to peer %s is 0!\n",
820 GNUNET_i2s(&th->peer));
822 /* client decided to send nothing! */
825 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
826 if (dt + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
831 sm->header.size = htons (dt + sizeof (struct SendMessage));
832 GNUNET_assert (dt + sizeof (struct SendMessage) <= size);
833 return dt + sizeof (struct SendMessage);
838 * Ask the core to call "notify" once it is ready to transmit the
839 * given number of bytes to the specified "target". If we are not yet
840 * connected to the specified peer, a call to this function will cause
841 * us to try to establish a connection.
843 * @param handle connection to core service
844 * @param priority how important is the message?
845 * @param maxdelay how long can the message wait?
846 * @param target who should receive the message,
847 * use NULL for this peer (loopback)
848 * @param notify_size how many bytes of buffer space does notify want?
849 * @param notify function to call when buffer space is available
850 * @param notify_cls closure for notify
851 * @return non-NULL if the notify callback was queued,
852 * NULL if we can not even queue the request (insufficient
853 * memory); if NULL is returned, "notify" will NOT be called.
855 struct GNUNET_CORE_TransmitHandle *
856 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
857 unsigned int priority,
858 struct GNUNET_TIME_Relative maxdelay,
859 const struct GNUNET_PeerIdentity *target,
861 GNUNET_CONNECTION_TransmitReadyNotify notify,
864 struct GNUNET_CORE_TransmitHandle *th;
866 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
867 GNUNET_SERVER_MAX_MESSAGE_SIZE);
868 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
870 GNUNET_CONTAINER_DLL_insert_after (handle->pending_head,
871 handle->pending_tail,
872 handle->pending_tail,
874 th->get_message = &produce_send;
875 th->get_message_cls = th;
877 th->notify_cls = notify_cls;
879 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
880 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
882 &timeout_request, th);
883 th->priority = priority;
884 th->msize = sizeof (struct SendMessage) + notify_size;
885 /* was the request queue previously empty? */
886 if ( (handle->pending_head == th) &&
887 (handle->cth == NULL) )
888 trigger_next_request (handle);
894 * Cancel the specified transmission-ready notification.
896 * @param th handle that was returned by "notify_transmit_ready".
899 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
902 struct GNUNET_CORE_Handle *h = th->ch;
904 if (h->submitted == th)
907 GNUNET_CONTAINER_DLL_remove (h->pending_head,
910 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
911 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
916 /* end of core_api.c */