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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 and size %u from peer `%4s'\n",
436 GNUNET_i2s (&ntm->peer));
438 if ((GNUNET_NO == h->inbound_hdr_only) &&
439 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
444 et = ntohs (em->type);
445 for (hpos = 0; hpos < h->hcnt; hpos++)
447 mh = &h->handlers[hpos];
450 if ((mh->expected_size != ntohs (em->size)) &&
451 (mh->expected_size != 0))
457 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
458 GNUNET_TIME_relative_ntoh (ntm->latency),
459 ntohl (ntm->distance)))
461 /* error in processing, disconnect ! */
466 if (NULL != h->inbound_notify)
467 h->inbound_notify (h->cls, &ntm->peer, em,
468 GNUNET_TIME_relative_ntoh (ntm->latency),
469 ntohl (ntm->distance));
471 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
473 sizeof (struct NotifyTrafficMessage) +
474 sizeof (struct GNUNET_MessageHeader))
479 ntm = (const struct NotifyTrafficMessage *) msg;
480 em = (const struct GNUNET_MessageHeader *) &ntm[1];
481 if ((GNUNET_NO == h->outbound_hdr_only) &&
482 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
487 if (NULL == h->outbound_notify)
492 h->outbound_notify (h->cls, &ntm->peer, em,
493 GNUNET_TIME_relative_ntoh (ntm->latency),
494 ntohl (ntm->distance));
500 GNUNET_CLIENT_receive (h->client_notifications,
501 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
506 * Function called when we are ready to transmit our
507 * "START" message (or when this operation timed out).
510 * @param size number of bytes available in buf
511 * @param buf where the callee should write the message
512 * @return number of bytes written to buf
514 static size_t transmit_start (void *cls, size_t size, void *buf);
518 * Function called on the first message received from
519 * the service (contains our public key, etc.).
520 * Should trigger calling the init callback
521 * and then start our regular message processing.
524 * @param msg message received, NULL on timeout or fatal error
527 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
529 struct GNUNET_CORE_Handle *h = cls;
530 const struct InitReplyMessage *m;
531 GNUNET_CORE_StartupCallback init;
532 struct GNUNET_PeerIdentity my_identity;
535 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
536 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
540 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
542 ("Error connecting to core service (failed to receive `%s' message, got message of type %u and size %u).\n"),
551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
552 _("Failed to connect to core service, will retry.\n"));
555 transmit_start (h, 0, NULL);
558 m = (const struct InitReplyMessage *) msg;
559 /* start our message processing loop */
561 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
562 "Successfully connected to core service, starting processing loop.\n");
564 h->currently_down = GNUNET_NO;
565 trigger_next_request (h);
566 GNUNET_CLIENT_receive (h->client_notifications,
567 &main_notify_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
568 if (NULL != (init = h->init))
570 /* mark so we don't call init on reconnect */
572 GNUNET_CRYPTO_hash (&m->publicKey,
574 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
575 &my_identity.hashPubKey);
576 init (h->cls, h, &my_identity, &m->publicKey);
582 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
584 struct GNUNET_CORE_Handle *h = cls;
585 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
591 * Function called when we are ready to transmit our
592 * "START" message (or when this operation timed out).
595 * @param size number of bytes available in buf
596 * @param buf where the callee should write the message
597 * @return number of bytes written to buf
600 transmit_start (void *cls, size_t size, void *buf)
602 struct GNUNET_CORE_Handle *h = cls;
603 struct InitMessage *init;
608 struct GNUNET_TIME_Relative delay;
613 if ((h->init == NULL) ||
614 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
616 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
617 _("Failed to connect to core service, retrying.\n"));
618 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
619 if ((h->init == NULL) || (delay.value > 1000))
620 delay = GNUNET_TIME_UNIT_SECONDS;
623 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
625 GNUNET_SCHEDULER_add_delayed (h->sched,
626 delay, &reconnect_task, h);
629 /* timeout on initial connect */
630 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
631 _("Failed to connect to core service, giving up.\n"));
632 h->init (h->cls, NULL, NULL, NULL);
633 GNUNET_CORE_disconnect (h);
636 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
637 GNUNET_assert (size >= msize);
639 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
640 init->header.size = htons (msize);
641 opt = GNUNET_CORE_OPTION_NOTHING;
642 if (h->connects != NULL)
643 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
644 if (h->disconnects != NULL)
645 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
646 if (h->inbound_notify != NULL)
648 if (h->inbound_hdr_only)
649 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
651 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
653 if (h->outbound_notify != NULL)
655 if (h->outbound_hdr_only)
656 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
658 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
660 init->options = htonl (opt);
661 ts = (uint16_t *) & init[1];
662 for (hpos = 0; hpos < h->hcnt; hpos++)
663 ts[hpos] = htons (h->handlers[hpos].type);
664 GNUNET_CLIENT_receive (h->client_notifications,
667 GNUNET_TIME_absolute_get_remaining
668 (h->startup_timeout));
669 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
674 * Connect to the core service. Note that the connection may
675 * complete (or fail) asynchronously.
677 * @param sched scheduler to use
678 * @param cfg configuration to use
679 * @param timeout after how long should we give up trying to connect to the core service?
680 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
681 * @param init callback to call on timeout or once we have successfully
682 * connected to the core service; note that timeout is only meaningful if init is not NULL
683 * @param connects function to call on peer connect, can be NULL
684 * @param disconnects function to call on peer disconnect / timeout, can be NULL
685 * @param inbound_notify function to call for all inbound messages, can be NULL
686 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
687 * GNUNET_MessageHeader and hence we do not need to give it the full message;
688 * can be used to improve efficiency, ignored if inbound_notify is NULLL
689 * @param outbound_notify function to call for all outbound messages, can be NULL
690 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
691 * GNUNET_MessageHeader and hence we do not need to give it the full message
692 * can be used to improve efficiency, ignored if outbound_notify is NULLL
693 * @param handlers callbacks for messages we care about, NULL-terminated
694 * @return handle to the core service (only useful for disconnect until 'init' is called);
695 * NULL on error (in this case, init is never called)
697 struct GNUNET_CORE_Handle *
698 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
699 const struct GNUNET_CONFIGURATION_Handle *cfg,
700 struct GNUNET_TIME_Relative timeout,
702 GNUNET_CORE_StartupCallback init,
703 GNUNET_CORE_ConnectEventHandler connects,
704 GNUNET_CORE_DisconnectEventHandler disconnects,
705 GNUNET_CORE_MessageCallback inbound_notify,
706 int inbound_hdr_only,
707 GNUNET_CORE_MessageCallback outbound_notify,
708 int outbound_hdr_only,
709 const struct GNUNET_CORE_MessageHandler *handlers)
711 struct GNUNET_CORE_Handle *h;
713 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
718 h->connects = connects;
719 h->disconnects = disconnects;
720 h->inbound_notify = inbound_notify;
721 h->outbound_notify = outbound_notify;
722 h->inbound_hdr_only = inbound_hdr_only;
723 h->outbound_hdr_only = outbound_hdr_only;
724 h->handlers = handlers;
725 h->client_notifications = GNUNET_CLIENT_connect (sched, "core", cfg);
726 if (h->client_notifications == NULL)
731 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
733 while (handlers[h->hcnt].callback != NULL)
735 GNUNET_assert (h->hcnt <
736 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
737 sizeof (struct InitMessage)) / sizeof (uint16_t));
739 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
740 "Trying to connect to core service in next %llu ms.\n",
744 GNUNET_CLIENT_notify_transmit_ready (h->client_notifications,
745 sizeof (struct InitMessage) +
746 sizeof (uint16_t) * h->hcnt, timeout,
754 * Disconnect from the core service.
756 * @param handle connection to core to disconnect
759 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
761 if (handle->cth != NULL)
762 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
763 if (handle->solicit_transmit_req != NULL)
764 GNUNET_CORE_notify_transmit_ready_cancel (handle->solicit_transmit_req);
765 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
766 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
767 if (handle->client_notifications != NULL)
768 GNUNET_CLIENT_disconnect (handle->client_notifications, GNUNET_NO);
769 GNUNET_free_non_null (handle->solicit_buffer);
770 GNUNET_free (handle);
775 * Build the message requesting data transmission.
778 produce_send (void *cls, size_t size, void *buf)
780 struct GNUNET_CORE_TransmitHandle *th = cls;
781 struct GNUNET_CORE_Handle *h;
782 struct SendMessage *sm;
784 GNUNET_CONNECTION_TransmitReadyNotify notify;
790 /* timeout or error */
792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
793 "P2P transmission request for `%4s' timed out.\n",
794 GNUNET_i2s(&th->peer));
796 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
797 GNUNET_CORE_notify_transmit_ready_cancel (th);
798 trigger_next_request (h);
802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
803 "Preparing for P2P transmission to `%4s'.\n",
804 GNUNET_i2s(&th->peer));
806 sm = (struct SendMessage *) buf;
807 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
808 sm->priority = htonl (th->priority);
809 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
812 notify_cls = th->notify_cls;
813 GNUNET_CORE_notify_transmit_ready_cancel (th);
814 trigger_next_request (h);
815 GNUNET_assert (size >= sizeof (struct SendMessage));
816 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Size of clients message to peer %s is 0!\n",
822 GNUNET_i2s(&th->peer));
824 /* client decided to send nothing! */
827 GNUNET_assert (dt >= sizeof (struct GNUNET_MessageHeader));
828 if (dt + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
833 sm->header.size = htons (dt + sizeof (struct SendMessage));
834 GNUNET_assert (dt + sizeof (struct SendMessage) <= size);
835 return dt + sizeof (struct SendMessage);
840 * Ask the core to call "notify" once it is ready to transmit the
841 * given number of bytes to the specified "target". If we are not yet
842 * connected to the specified peer, a call to this function will cause
843 * us to try to establish a connection.
845 * @param handle connection to core service
846 * @param priority how important is the message?
847 * @param maxdelay how long can the message wait?
848 * @param target who should receive the message,
849 * use NULL for this peer (loopback)
850 * @param notify_size how many bytes of buffer space does notify want?
851 * @param notify function to call when buffer space is available
852 * @param notify_cls closure for notify
853 * @return non-NULL if the notify callback was queued,
854 * NULL if we can not even queue the request (insufficient
855 * memory); if NULL is returned, "notify" will NOT be called.
857 struct GNUNET_CORE_TransmitHandle *
858 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
859 unsigned int priority,
860 struct GNUNET_TIME_Relative maxdelay,
861 const struct GNUNET_PeerIdentity *target,
863 GNUNET_CONNECTION_TransmitReadyNotify notify,
866 struct GNUNET_CORE_TransmitHandle *th;
868 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
869 GNUNET_SERVER_MAX_MESSAGE_SIZE);
870 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
872 GNUNET_CONTAINER_DLL_insert_after (handle->pending_head,
873 handle->pending_tail,
874 handle->pending_tail,
876 th->get_message = &produce_send;
877 th->get_message_cls = th;
879 th->notify_cls = notify_cls;
881 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
882 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
884 &timeout_request, th);
885 th->priority = priority;
886 th->msize = sizeof (struct SendMessage) + notify_size;
887 /* was the request queue previously empty? */
888 if ( (handle->pending_head == th) &&
889 (handle->cth == NULL) )
890 trigger_next_request (handle);
896 * Cancel the specified transmission-ready notification.
898 * @param th handle that was returned by "notify_transmit_ready".
901 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
904 struct GNUNET_CORE_Handle *h = th->ch;
906 if (h->submitted == th)
909 GNUNET_CONTAINER_DLL_remove (h->pending_head,
912 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
913 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
918 /* end of core_api.c */