2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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.
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're asked to generate traffic
70 * (data provided to be transmitted back to the service).
72 GNUNET_CORE_BufferFillCallback bfc;
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.
92 struct GNUNET_CLIENT_Connection *client;
95 * Handle for our current transmission request.
97 struct GNUNET_CONNECTION_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 * How long to wait until we time out the connection attempt?
117 struct GNUNET_TIME_Absolute startup_timeout;
120 * ID of reconnect task (if any).
122 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
125 * Number of entries in the handlers array.
130 * For inbound notifications without a specific handler, do
131 * we expect to only receive headers?
133 int inbound_hdr_only;
136 * For outbound notifications without a specific handler, do
137 * we expect to only receive headers?
139 int outbound_hdr_only;
142 * Are we currently disconnected and hence unable to forward
150 * Handle for a transmission request.
152 struct GNUNET_CORE_TransmitHandle
156 * We keep active transmit handles in a doubly-linked list.
158 struct GNUNET_CORE_TransmitHandle *next;
161 * We keep active transmit handles in a doubly-linked list.
163 struct GNUNET_CORE_TransmitHandle *prev;
166 * Corresponding core handle.
168 struct GNUNET_CORE_Handle *ch;
171 * Function that will be called to get the actual request
172 * (once we are ready to transmit this request to the core).
173 * The function will be called with a NULL buffer to signal
176 GNUNET_CONNECTION_TransmitReadyNotify get_message;
179 * Closure for get_message.
181 void *get_message_cls;
184 * If this entry is for a configuration request, pointer
185 * to the information callback; otherwise NULL.
187 GNUNET_CORE_PeerConfigurationInfoCallback info;
195 * If this entry is for a transmission request, pointer
196 * to the notify callback; otherwise NULL.
198 GNUNET_CONNECTION_TransmitReadyNotify notify;
201 * Closure for notify.
206 * Peer the request is about.
208 struct GNUNET_PeerIdentity peer;
211 * Timeout for this handle.
213 struct GNUNET_TIME_Absolute timeout;
216 * ID of timeout task.
218 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
221 * How important is this message?
226 * Size of this request.
235 * Function called when we are ready to transmit our
236 * "START" message (or when this operation timed out).
239 * @param size number of bytes available in buf
240 * @param buf where the callee should write the message
241 * @return number of bytes written to buf
243 static size_t transmit_start (void *cls, size_t size, void *buf);
247 * Our current client connection went down. Clean it up
248 * and try to reconnect!
251 reconnect (struct GNUNET_CORE_Handle *h)
253 GNUNET_CLIENT_disconnect (h->client);
254 h->currently_down = GNUNET_YES;
255 h->client = GNUNET_CLIENT_connect (h->sched, "core", h->cfg);
256 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
257 sizeof (struct InitMessage) +
258 sizeof (uint16_t) * h->hcnt,
259 GNUNET_TIME_UNIT_SECONDS,
265 * The given request hit its timeout. Remove from the
266 * doubly-linked list and call the respective continuation.
268 * @param cls the transmit handle of the request that timed out
269 * @param tc context, can be NULL (!)
272 timeout_request (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
274 struct GNUNET_CORE_TransmitHandle *th = cls;
276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
277 "Transmission request timed out.\n");
278 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
279 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
280 GNUNET_CORE_notify_transmit_ready_cancel (th);
285 * Function called when we are ready to transmit a request from our
286 * request list (or when this operation timed out).
289 * @param size number of bytes available in buf
290 * @param buf where the callee should write the message
291 * @return number of bytes written to buf
294 request_start (void *cls, size_t size, void *buf)
296 struct GNUNET_CORE_Handle *h = cls;
297 struct GNUNET_CORE_TransmitHandle *th;
301 th = h->pending_head;
304 timeout_request (th, NULL);
307 /* create new timeout task (in case core takes too long to respond!) */
308 th->timeout_task = GNUNET_SCHEDULER_add_delayed (h->sched,
310 GNUNET_SCHEDULER_PRIORITY_KEEP,
311 GNUNET_SCHEDULER_NO_TASK,
312 GNUNET_TIME_absolute_get_remaining
314 &timeout_request, th);
315 /* remove th from doubly-linked pending list, move to submitted */
316 GNUNET_assert (th->prev == NULL);
317 h->pending_head = th->next;
318 if (th->next == NULL)
319 h->pending_tail = NULL;
321 th->next->prev = NULL;
322 GNUNET_assert (h->submitted == NULL);
324 GNUNET_assert (size >= th->msize);
325 ret = th->get_message (th->get_message_cls, size, buf);
326 GNUNET_assert (ret <= size);
332 * Check the list of pending requests, send the next
336 trigger_next_request (struct GNUNET_CORE_Handle *h)
338 struct GNUNET_CORE_TransmitHandle *th;
339 if (h->currently_down)
340 return; /* connection temporarily down */
341 if (NULL == (th = h->pending_head))
342 return; /* no requests pending */
343 GNUNET_assert (NULL == h->th);
344 GNUNET_SCHEDULER_cancel (h->sched, th->timeout_task);
345 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
346 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client,
348 GNUNET_TIME_absolute_get_remaining
349 (th->timeout), &request_start,
355 * cls is a pointer to a 32 bit number followed by that
356 * amount of data. If possible, copy to buf and return
357 * number of bytes copied. Always free the buffer.
360 copy_and_free (void *cls, size_t size, void *buf)
365 memcpy (&have, cbuf, sizeof (uint32_t));
368 /* timeout / error case */
372 memcpy (buf, cbuf + sizeof (uint32_t), have);
379 * Call bfc callback to solicit traffic for the given peer.
382 solicit_traffic (struct GNUNET_CORE_Handle *h,
383 const struct GNUNET_PeerIdentity *peer, uint32_t amount)
389 have = h->bfc (h->cls, peer, buf, amount);
392 GNUNET_assert (have >= sizeof (struct GNUNET_MessageHeader));
393 cbuf = GNUNET_malloc (have + sizeof (uint32_t));
394 memcpy (cbuf, &have, sizeof (uint32_t));
395 memcpy (cbuf + sizeof (uint32_t), buf, have);
396 GNUNET_CORE_notify_transmit_ready (h,
398 GNUNET_TIME_UNIT_SECONDS,
399 peer, have, ©_and_free, cbuf);
404 * Handler for most messages received from the core.
407 main_handler (void *cls, const struct GNUNET_MessageHeader *msg)
409 struct GNUNET_CORE_Handle *h = cls;
411 const struct ConnectNotifyMessage *cnm;
412 const struct NotifyTrafficMessage *ntm;
413 const struct ConfigurationInfoMessage *cim;
414 const struct SolicitTrafficMessage *stm;
415 const struct GNUNET_MessageHeader *em;
419 const struct GNUNET_CORE_MessageHandler *mh;
423 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
425 ("Client was disconnected from core service, trying to reconnect.\n"));
429 msize = ntohs (msg->size);
431 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
432 "Processing message of type %u and size %u from core service\n",
433 ntohs (msg->type), msize);
435 switch (ntohs (msg->type))
437 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
438 if (NULL == h->connects)
443 if (msize != sizeof (struct ConnectNotifyMessage))
448 cnm = (const struct ConnectNotifyMessage *) msg;
452 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
453 if (NULL == h->disconnects)
458 if (msize != sizeof (struct ConnectNotifyMessage))
463 cnm = (const struct ConnectNotifyMessage *) msg;
464 h->disconnects (h->cls,
467 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
469 sizeof (struct NotifyTrafficMessage) +
470 sizeof (struct GNUNET_MessageHeader))
475 ntm = (const struct NotifyTrafficMessage *) msg;
476 em = (const struct GNUNET_MessageHeader *) &ntm[1];
478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
479 "Received message of type %u from peer `%4s'\n",
480 ntohs (em->type), GNUNET_i2s (&ntm->peer));
482 if ((GNUNET_NO == h->inbound_hdr_only) &&
483 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
488 et = ntohs (em->type);
489 for (hpos = 0; hpos < h->hcnt; hpos++)
491 mh = &h->handlers[hpos];
494 if ((mh->expected_size != ntohs (em->size)) &&
495 (mh->expected_size != 0))
501 h->handlers[hpos].callback (h->cls, &ntm->peer, em))
503 /* error in processing, disconnect ! */
508 if (NULL != h->inbound_notify)
509 h->inbound_notify (h->cls, &ntm->peer, em);
511 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
513 sizeof (struct NotifyTrafficMessage) +
514 sizeof (struct GNUNET_MessageHeader))
519 ntm = (const struct NotifyTrafficMessage *) msg;
520 em = (const struct GNUNET_MessageHeader *) &ntm[1];
521 if ((GNUNET_NO == h->outbound_hdr_only) &&
522 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
527 if (NULL == h->outbound_notify)
532 h->outbound_notify (h->cls, &ntm->peer, em);
534 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
535 if (msize != sizeof (struct ConfigurationInfoMessage))
540 if (NULL == h->submitted)
542 cim = (const struct ConfigurationInfoMessage *) msg;
544 /* process configuration data */
545 if (h->submitted->info != NULL)
546 h->submitted->info (h->submitted->info_cls,
549 ntohl (cim->bpm_out),
550 GNUNET_TIME_relative_ntoh (cim->latency),
551 (int) ntohl (cim->reserved_amount),
553 /* done, clean up! */
554 GNUNET_CORE_notify_transmit_ready_cancel (h->submitted); // HUH?
555 trigger_next_request (h);
557 case GNUNET_MESSAGE_TYPE_CORE_SOLICIT_TRAFFIC:
558 if (msize != sizeof (struct SolicitTrafficMessage))
563 stm = (const struct SolicitTrafficMessage *) msg;
569 ss = ntohl (stm->solicit_size);
570 if ((ss > GNUNET_SERVER_MAX_MESSAGE_SIZE) ||
571 (ss + sizeof (struct SendMessage) > GNUNET_SERVER_MAX_MESSAGE_SIZE))
576 solicit_traffic (h, &stm->peer, ss);
582 GNUNET_CLIENT_receive (h->client,
583 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
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
597 static size_t transmit_start (void *cls, size_t size, void *buf);
601 * Function called on the first message received from
602 * the service (contains our public key, etc.).
603 * Should trigger calling the init callback
604 * and then start our regular message processing.
607 * @param msg message received, NULL on timeout or fatal error
610 init_reply_handler (void *cls, const struct GNUNET_MessageHeader *msg)
612 struct GNUNET_CORE_Handle *h = cls;
613 const struct InitReplyMessage *m;
614 GNUNET_CORE_StartupCallback init;
615 struct GNUNET_PeerIdentity my_identity;
618 (ntohs (msg->size) != sizeof (struct InitReplyMessage)) ||
619 (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY))
621 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
623 ("Error connecting to core service (failed to receive `%s' message).\n"),
625 GNUNET_break (msg == NULL);
626 transmit_start (h, 0, NULL);
629 m = (const struct InitReplyMessage *) msg;
630 /* start our message processing loop */
632 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
634 ("Successfully connected to core service, starting processing loop.\n"));
636 h->currently_down = GNUNET_NO;
637 trigger_next_request (h);
638 GNUNET_CLIENT_receive (h->client,
639 &main_handler, h, GNUNET_TIME_UNIT_FOREVER_REL);
640 if (NULL != (init = h->init))
642 /* mark so we don't call init on reconnect */
645 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
646 _("Successfully connected to core service.\n"));
648 GNUNET_CRYPTO_hash (&m->publicKey,
650 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
651 &my_identity.hashPubKey);
652 init (h->cls, h, &my_identity, &m->publicKey);
658 reconnect_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
660 struct GNUNET_CORE_Handle *h = cls;
661 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
667 * Function called when we are ready to transmit our
668 * "START" message (or when this operation timed out).
671 * @param size number of bytes available in buf
672 * @param buf where the callee should write the message
673 * @return number of bytes written to buf
676 transmit_start (void *cls, size_t size, void *buf)
678 struct GNUNET_CORE_Handle *h = cls;
679 struct InitMessage *init;
684 struct GNUNET_TIME_Relative delay;
689 if ((h->init == NULL) ||
690 (GNUNET_TIME_absolute_get ().value < h->startup_timeout.value))
692 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
693 _("Failed to connect to core service, retrying.\n"));
694 delay = GNUNET_TIME_absolute_get_remaining (h->startup_timeout);
695 if ((h->init == NULL) || (delay.value > 1000))
696 delay = GNUNET_TIME_UNIT_SECONDS;
699 GNUNET_TIME_relative_to_absolute (GNUNET_TIME_UNIT_MINUTES);
701 GNUNET_SCHEDULER_add_delayed (h->sched, GNUNET_NO,
702 GNUNET_SCHEDULER_PRIORITY_IDLE,
703 GNUNET_SCHEDULER_NO_TASK,
704 delay, &reconnect_task, h);
707 /* timeout on initial connect */
708 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
709 _("Failed to connect to core service, giving up.\n"));
710 h->init (h->cls, NULL, NULL, NULL);
711 GNUNET_CORE_disconnect (h);
714 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
715 GNUNET_assert (size >= msize);
717 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
718 init->header.size = htons (msize);
719 opt = GNUNET_CORE_OPTION_NOTHING;
720 if (h->connects != NULL)
721 opt |= GNUNET_CORE_OPTION_SEND_CONNECT;
722 if (h->disconnects != NULL)
723 opt |= GNUNET_CORE_OPTION_SEND_DISCONNECT;
725 opt |= GNUNET_CORE_OPTION_SEND_BFC;
726 if (h->inbound_notify != NULL)
728 if (h->inbound_hdr_only)
729 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
731 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
733 if (h->outbound_notify != NULL)
735 if (h->outbound_hdr_only)
736 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
738 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
740 init->options = htonl (opt);
741 ts = (uint16_t *) & init[1];
742 for (hpos = 0; hpos < h->hcnt; hpos++)
743 ts[hpos] = htons (h->handlers[hpos].type);
744 GNUNET_CLIENT_receive (h->client,
747 GNUNET_TIME_absolute_get_remaining
748 (h->startup_timeout));
749 return sizeof (struct InitMessage) + h->hcnt * sizeof (uint16_t);
754 * Connect to the core service. Note that the connection may
755 * complete (or fail) asynchronously.
757 * @param sched scheduler to use
758 * @param cfg configuration to use
759 * @param timeout after how long should we give up trying to connect to the core service?
760 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
761 * @param init callback to call on timeout or once we have successfully
762 * connected to the core service
763 * @param connects function to call on peer connect, can be NULL
764 * @param disconnects function to call on peer disconnect / timeout, can be NULL
765 * @param bfc function to call to fill up spare bandwidth, can be NULL
766 * @param inbound_notify function to call for all inbound messages, can be NULL
767 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
768 * GNUNET_MessageHeader and hence we do not need to give it the full message;
769 * can be used to improve efficiency, ignored if inbound_notify is NULLL
770 * @param outbound_notify function to call for all outbound messages, can be NULL
771 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
772 * GNUNET_MessageHeader and hence we do not need to give it the full message
773 * can be used to improve efficiency, ignored if outbound_notify is NULLL
774 * @param handlers callbacks for messages we care about, NULL-terminated
777 GNUNET_CORE_connect (struct GNUNET_SCHEDULER_Handle *sched,
778 const struct GNUNET_CONFIGURATION_Handle *cfg,
779 struct GNUNET_TIME_Relative timeout,
781 GNUNET_CORE_StartupCallback init,
782 GNUNET_CORE_ClientEventHandler connects,
783 GNUNET_CORE_ClientEventHandler disconnects,
784 GNUNET_CORE_BufferFillCallback bfc,
785 GNUNET_CORE_MessageCallback inbound_notify,
786 int inbound_hdr_only,
787 GNUNET_CORE_MessageCallback outbound_notify,
788 int outbound_hdr_only,
789 const struct GNUNET_CORE_MessageHandler *handlers)
791 struct GNUNET_CORE_Handle *h;
793 GNUNET_assert (init != NULL);
794 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
799 h->connects = connects;
800 h->disconnects = disconnects;
802 h->inbound_notify = inbound_notify;
803 h->outbound_notify = outbound_notify;
804 h->inbound_hdr_only = inbound_hdr_only;
805 h->outbound_hdr_only = outbound_hdr_only;
806 h->handlers = handlers;
807 h->client = GNUNET_CLIENT_connect (sched, "core", cfg);
808 h->startup_timeout = GNUNET_TIME_relative_to_absolute (timeout);
810 while (handlers[h->hcnt].callback != NULL)
812 GNUNET_assert (h->hcnt <
813 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
814 sizeof (struct InitMessage)) / sizeof (uint16_t));
816 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
817 "Trying to connect to core service in next %llu ms.\n",
821 GNUNET_CLIENT_notify_transmit_ready (h->client,
822 sizeof (struct InitMessage) +
823 sizeof (uint16_t) * h->hcnt, timeout,
829 * Disconnect from the core service.
831 * @param handle connection to core to disconnect
834 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
836 if (handle->th != NULL)
837 GNUNET_CONNECTION_notify_transmit_ready_cancel (handle->th);
838 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
839 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
840 GNUNET_CLIENT_disconnect (handle->client);
841 GNUNET_free (handle);
846 * Build the configure message.
849 produce_configure_message (void *cls, size_t size, void *buf)
851 struct GNUNET_CORE_TransmitHandle *th = cls;
852 struct GNUNET_CORE_Handle *ch = th->ch;
856 /* communicate handle timeout/error! */
857 if (th->info != NULL)
858 th->info (th->info_cls, NULL, 0, 0, GNUNET_TIME_UNIT_ZERO, 0, 0.0);
859 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
860 GNUNET_CORE_notify_transmit_ready_cancel (th);
861 if (ch->submitted == th)
862 ch->submitted = NULL;
863 trigger_next_request (ch);
866 GNUNET_assert (size >= sizeof (struct RequestConfigureMessage));
867 memcpy (buf, &th[1], sizeof (struct RequestConfigureMessage));
868 if (th->prev == NULL)
869 ch->pending_head = th->next;
871 th->prev->next = th->next;
872 if (th->next == NULL)
873 ch->pending_tail = th->prev;
875 th->next->prev = th->prev;
876 GNUNET_assert (ch->submitted == NULL);
878 return sizeof (struct RequestConfigureMessage);
883 * Obtain statistics and/or change preferences for the given peer.
885 * @param handle connection to core to use
886 * @param peer identifies the peer
887 * @param timeout after how long should we give up (and call "info" with NULL
888 * for "peer" to signal an error)?
889 * @param bpm_out set to the current bandwidth limit (sending) for this peer,
890 * caller should set "bpm_out" to "-1" to avoid changing
891 * the current value; otherwise "bpm_out" will be lowered to
892 * the specified value; passing a pointer to "0" can be used to force
893 * us to disconnect from the peer; "bpm_out" might not increase
894 * as specified since the upper bound is generally
895 * determined by the other peer!
896 * @param amount reserve N bytes for receiving, negative
897 * amounts can be used to undo a (recent) reservation;
898 * @param preference increase incoming traffic share preference by this amount;
899 * in the absence of "amount" reservations, we use this
900 * preference value to assign proportional bandwidth shares
901 * to all connected peers
902 * @param info function to call with the resulting configuration information
903 * @param info_cls closure for info
906 GNUNET_CORE_peer_configure (struct GNUNET_CORE_Handle *handle,
907 const struct GNUNET_PeerIdentity *peer,
908 struct GNUNET_TIME_Relative timeout,
909 unsigned int bpm_out,
911 unsigned long long preference,
912 GNUNET_CORE_PeerConfigurationInfoCallback info,
915 struct RequestConfigureMessage *rcm;
916 struct GNUNET_CORE_TransmitHandle *th;
918 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle) +
919 sizeof (struct RequestConfigureMessage));
921 th->prev = handle->pending_tail;
922 if (handle->pending_tail == NULL)
923 handle->pending_head = th;
925 handle->pending_tail->next = th;
927 th->get_message = &produce_configure_message;
928 th->get_message_cls = th;
930 th->info_cls = info_cls;
931 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
932 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
934 GNUNET_SCHEDULER_PRIORITY_KEEP,
935 GNUNET_SCHEDULER_NO_TASK,
937 &timeout_request, th);
938 th->msize = sizeof (struct RequestConfigureMessage);
939 rcm = (struct RequestConfigureMessage *) &th[1];
940 rcm->header.size = htons (sizeof (struct RequestConfigureMessage));
941 rcm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONFIGURE);
942 rcm->reserved = htonl (0);
943 rcm->limit_outbound_bpm = htonl (bpm_out);
944 rcm->reserve_inbound = htonl (amount);
945 rcm->preference_change = GNUNET_htonll(preference);
947 if (handle->pending_head == th)
948 trigger_next_request (handle);
953 * Build the message requesting data transmission.
956 produce_send (void *cls, size_t size, void *buf)
958 struct GNUNET_CORE_TransmitHandle *th = cls;
959 struct GNUNET_CORE_Handle *h;
960 struct SendMessage *sm;
962 GNUNET_CONNECTION_TransmitReadyNotify notify;
968 /* timeout or error */
970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
971 "P2P transmission request for `%4s' timed out.\n",
972 GNUNET_i2s(&th->peer));
974 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
975 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
976 GNUNET_CORE_notify_transmit_ready_cancel (th);
977 trigger_next_request (h);
981 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
982 "Preparing for P2P transmission to `%4s'.\n",
983 GNUNET_i2s(&th->peer));
985 GNUNET_assert (th->timeout_task != GNUNET_SCHEDULER_NO_TASK);
986 sm = (struct SendMessage *) buf;
987 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
988 sm->priority = htonl (th->priority);
989 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
992 notify_cls = th->notify_cls;
993 GNUNET_CORE_notify_transmit_ready_cancel (th);
994 trigger_next_request (h);
995 GNUNET_assert (size >= sizeof (struct SendMessage));
996 dt = notify (notify_cls, size - sizeof (struct SendMessage), &sm[1]);
997 sm->header.size = htons (dt + sizeof (struct SendMessage));
998 GNUNET_assert (dt + sizeof (struct SendMessage) < size);
999 return dt + sizeof (struct SendMessage);
1004 * Ask the core to call "notify" once it is ready to transmit the
1005 * given number of bytes to the specified "target". If we are not yet
1006 * connected to the specified peer, a call to this function will cause
1007 * us to try to establish a connection.
1009 * @param handle connection to core service
1010 * @param priority how important is the message?
1011 * @param maxdelay how long can the message wait?
1012 * @param target who should receive the message,
1013 * use NULL for this peer (loopback)
1014 * @param notify_size how many bytes of buffer space does notify want?
1015 * @param notify function to call when buffer space is available
1016 * @param notify_cls closure for notify
1017 * @return non-NULL if the notify callback was queued,
1018 * NULL if we can not even queue the request (insufficient
1019 * memory); if NULL is returned, "notify" will NOT be called.
1021 struct GNUNET_CORE_TransmitHandle *
1022 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1023 unsigned int priority,
1024 struct GNUNET_TIME_Relative maxdelay,
1025 const struct GNUNET_PeerIdentity *target,
1027 GNUNET_CONNECTION_TransmitReadyNotify notify,
1030 struct GNUNET_CORE_TransmitHandle *th;
1032 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1033 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1034 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1036 /* append to list */
1037 th->prev = handle->pending_tail;
1038 if (handle->pending_tail == NULL)
1039 handle->pending_head = th;
1041 handle->pending_tail->next = th;
1042 th->get_message = &produce_send;
1043 th->get_message_cls = th;
1044 th->notify = notify;
1045 th->notify_cls = notify_cls;
1047 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1048 th->timeout_task = GNUNET_SCHEDULER_add_delayed (handle->sched,
1050 GNUNET_SCHEDULER_PRIORITY_KEEP,
1051 GNUNET_SCHEDULER_NO_TASK,
1053 &timeout_request, th);
1054 th->priority = priority;
1055 th->msize = sizeof (struct SendMessage) + notify_size;
1056 /* was the request queue previously empty? */
1057 if (handle->pending_head == th)
1058 trigger_next_request (handle);
1064 * Cancel the specified transmission-ready notification.
1066 * @param h handle that was returned by "notify_transmit_ready".
1069 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1072 struct GNUNET_CORE_Handle *handle = h->ch;
1074 if (handle->submitted == h)
1076 handle->submitted = NULL;
1080 if (h->prev == NULL)
1081 handle->pending_head = h->next;
1083 h->prev->next = h->next;
1084 if (h->next == NULL)
1085 handle->pending_tail = h->prev;
1087 h->next->prev = h->prev;
1089 if (h->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1090 GNUNET_SCHEDULER_cancel (handle->sched, h->timeout_task);
1095 /* end of core_api.c */