2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
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.
15 You should have received a copy of the GNU General Public License
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 * - implement atsi parsing and passing
31 #include "gnunet_constants.h"
32 #include "gnunet_core_service.h"
37 * Information we track for each peer.
43 * We generally do NOT keep peer records in a DLL; this
44 * DLL is only used IF this peer's 'pending_head' message
45 * is ready for transmission.
47 struct PeerRecord *prev;
50 * We generally do NOT keep peer records in a DLL; this
51 * DLL is only used IF this peer's 'pending_head' message
52 * is ready for transmission.
54 struct PeerRecord *next;
57 * Peer the record is about.
59 struct GNUNET_PeerIdentity peer;
62 * Corresponding core handle.
64 struct GNUNET_CORE_Handle *ch;
67 * Head of doubly-linked list of pending requests.
68 * Requests are sorted by deadline *except* for HEAD,
69 * which is only modified upon transmission to core.
71 struct GNUNET_CORE_TransmitHandle *pending_head;
74 * Tail of doubly-linked list of pending requests.
76 struct GNUNET_CORE_TransmitHandle *pending_tail;
79 * Pending callback waiting for peer information, or NULL for none.
81 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
89 * Request information ID for the given pcic (needed in case a
90 * request is cancelled after being submitted to core and a new
91 * one is generated; in this case, we need to avoid matching the
92 * reply to the first (cancelled) request to the second request).
97 * ID of timeout task for the 'pending_head' handle
98 * which is the one with the smallest timeout.
100 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
103 * Current size of the queue of pending requests.
105 unsigned int queue_size;
108 * SendMessageRequest ID generator for this peer.
116 * Entry in a doubly-linked list of control messages to be transmitted
117 * to the core service. Control messages include traffic allocation,
118 * connection requests and of course our initial 'init' request.
120 * The actual message is allocated at the end of this struct.
122 struct ControlMessage
125 * This is a doubly-linked list.
127 struct ControlMessage *next;
130 * This is a doubly-linked list.
132 struct ControlMessage *prev;
135 * Function to run after successful transmission (or call with
136 * reason 'TIMEOUT' on error); called with scheduler context 'NULL'
139 GNUNET_SCHEDULER_Task cont;
142 * Closure for 'cont'.
147 * Transmit handle (if one is associated with this ControlMessage), or NULL.
149 struct GNUNET_CORE_TransmitHandle *th;
155 * Context for the core service connection.
157 struct GNUNET_CORE_Handle
161 * Configuration we're using.
163 const struct GNUNET_CONFIGURATION_Handle *cfg;
166 * Closure for the various callbacks.
171 * Function to call once we've handshaked with the core service.
173 GNUNET_CORE_StartupCallback init;
176 * Function to call whenever we're notified about a peer connecting.
178 GNUNET_CORE_ConnectEventHandler connects;
181 * Function to call whenever we're notified about a peer disconnecting.
183 GNUNET_CORE_DisconnectEventHandler disconnects;
186 * Function to call whenever we're notified about a peer changing status.
188 GNUNET_CORE_PeerStatusEventHandler status_events;
191 * Function to call whenever we receive an inbound message.
193 GNUNET_CORE_MessageCallback inbound_notify;
196 * Function to call whenever we receive an outbound message.
198 GNUNET_CORE_MessageCallback outbound_notify;
201 * Function handlers for messages of particular type.
203 const struct GNUNET_CORE_MessageHandler *handlers;
206 * Our connection to the service.
208 struct GNUNET_CLIENT_Connection *client;
211 * Handle for our current transmission request.
213 struct GNUNET_CLIENT_TransmitHandle *cth;
216 * Head of doubly-linked list of pending requests.
218 struct ControlMessage *pending_head;
221 * Tail of doubly-linked list of pending requests.
223 struct ControlMessage *pending_tail;
226 * Head of doubly-linked list of peers that are core-approved
227 * to send their next message.
229 struct PeerRecord *ready_peer_head;
232 * Tail of doubly-linked list of peers that are core-approved
233 * to send their next message.
235 struct PeerRecord *ready_peer_tail;
238 * Hash map listing all of the peers that we are currently
241 struct GNUNET_CONTAINER_MultiHashMap *peers;
244 * Identity of this peer.
246 struct GNUNET_PeerIdentity me;
249 * ID of reconnect task (if any).
251 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
254 * Current delay we use for re-trying to connect to core.
256 struct GNUNET_TIME_Relative retry_backoff;
259 * Request information ID generator.
264 * Number of messages we are allowed to queue per target.
266 unsigned int queue_size;
269 * Number of entries in the handlers array.
274 * For inbound notifications without a specific handler, do
275 * we expect to only receive headers?
277 int inbound_hdr_only;
280 * For outbound notifications without a specific handler, do
281 * we expect to only receive headers?
283 int outbound_hdr_only;
286 * Are we currently disconnected and hence unable to forward
295 * Handle for a transmission request.
297 struct GNUNET_CORE_TransmitHandle
301 * We keep active transmit handles in a doubly-linked list.
303 struct GNUNET_CORE_TransmitHandle *next;
306 * We keep active transmit handles in a doubly-linked list.
308 struct GNUNET_CORE_TransmitHandle *prev;
311 * Corresponding peer record.
313 struct PeerRecord *peer;
316 * Corresponding SEND_REQUEST message. Only non-NULL
317 * while SEND_REQUEST message is pending.
319 struct ControlMessage *cm;
322 * Function that will be called to get the actual request
323 * (once we are ready to transmit this request to the core).
324 * The function will be called with a NULL buffer to signal
327 GNUNET_CONNECTION_TransmitReadyNotify get_message;
330 * Closure for get_message.
332 void *get_message_cls;
335 * Timeout for this handle.
337 struct GNUNET_TIME_Absolute timeout;
340 * How important is this message?
345 * Size of this request.
350 * Send message request ID for this request.
358 * Our current client connection went down. Clean it up
359 * and try to reconnect!
361 * @param h our handle to the core service
364 reconnect (struct GNUNET_CORE_Handle *h);
368 * Task schedule to try to re-connect to core.
370 * @param cls the 'struct GNUNET_CORE_Handle'
371 * @param tc task context
374 reconnect_task (void *cls,
375 const struct GNUNET_SCHEDULER_TaskContext *tc)
377 struct GNUNET_CORE_Handle *h = cls;
379 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
381 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
382 "Connecting to CORE service after delay\n");
389 * Notify clients about disconnect and free
390 * the entry for connected peer.
392 * @param cls the 'struct GNUNET_CORE_Handle*'
393 * @param key the peer identity (not used)
394 * @param value the 'struct PeerRecord' to free.
395 * @return GNUNET_YES (continue)
398 disconnect_and_free_peer_entry (void *cls,
399 const GNUNET_HashCode *key,
402 static struct GNUNET_BANDWIDTH_Value32NBO zero;
403 struct GNUNET_CORE_Handle *h = cls;
404 struct GNUNET_CORE_TransmitHandle *th;
405 struct PeerRecord *pr = value;
406 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
408 while (NULL != (th = pr->pending_head))
410 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
415 th->get_message (th->get_message_cls,
419 if (NULL != (pcic = pr->pcic))
427 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
429 GNUNET_SCHEDULER_cancel (pr->timeout_task);
430 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
432 GNUNET_assert (pr->queue_size == 0);
433 if ( (pr->prev != NULL) ||
434 (pr->next != NULL) ||
435 (h->ready_peer_head == pr) )
436 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
439 if (h->disconnects != NULL)
440 h->disconnects (h->cls,
442 GNUNET_assert (GNUNET_YES ==
443 GNUNET_CONTAINER_multihashmap_remove (h->peers,
446 GNUNET_assert (pr->pending_head == NULL);
447 GNUNET_assert (pr->pending_tail == NULL);
448 GNUNET_assert (pr->ch = h);
449 GNUNET_assert (pr->queue_size == 0);
450 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
457 * Close down any existing connection to the CORE service and
458 * try re-establishing it later.
460 * @param h our handle
463 reconnect_later (struct GNUNET_CORE_Handle *h)
465 struct ControlMessage *cm;
467 while (NULL != (cm = h->pending_head))
469 GNUNET_CONTAINER_DLL_remove (h->pending_head,
474 if (cm->cont != NULL)
475 cm->cont (cm->cont_cls, NULL);
478 if (h->client != NULL)
480 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
482 /* FIXME: is this right? GNUNET_CLIENT_disconnect frees all outstanding transmission handles, so h->cth is invalid! */
483 /* Otherwise a subsequent call to GNUNET_CORE_disconnect tries to cancel this task!!! */
485 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
486 &disconnect_and_free_peer_entry,
489 GNUNET_assert (h->pending_head == NULL);
490 h->currently_down = GNUNET_YES;
491 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
492 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
494 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
497 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
502 * Check the list of pending requests, send the next
505 * @param h core handle
506 * @param ignore_currently_down transmit message even if not initialized?
509 trigger_next_request (struct GNUNET_CORE_Handle *h,
510 int ignore_currently_down);
514 * The given request hit its timeout. Remove from the
515 * doubly-linked list and call the respective continuation.
517 * @param cls the transmit handle of the request that timed out
518 * @param tc context, can be NULL (!)
521 transmission_timeout (void *cls,
522 const struct GNUNET_SCHEDULER_TaskContext *tc);
526 * Send a control message to the peer asking for transmission
527 * of the message in the given peer record.
529 * @param pr peer to request transmission to
532 request_next_transmission (struct PeerRecord *pr)
534 struct GNUNET_CORE_Handle *h = pr->ch;
535 struct ControlMessage *cm;
536 struct SendMessageRequest *smr;
537 struct GNUNET_CORE_TransmitHandle *th;
539 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
541 GNUNET_SCHEDULER_cancel (pr->timeout_task);
542 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
544 if (NULL == (th = pr->pending_head))
546 trigger_next_request (h, GNUNET_NO);
549 GNUNET_assert (pr->prev == NULL);
550 GNUNET_assert (pr->next == NULL);
551 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
552 &transmission_timeout,
554 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
555 sizeof (struct SendMessageRequest));
558 smr = (struct SendMessageRequest*) &cm[1];
559 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
560 smr->header.size = htons (sizeof (struct SendMessageRequest));
561 smr->priority = htonl (th->priority);
562 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
563 smr->peer = pr->peer;
564 smr->queue_size = htonl (pr->queue_size);
565 smr->size = htons (th->msize);
566 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
567 GNUNET_CONTAINER_DLL_insert_after (h->pending_head,
572 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
573 "Adding SEND REQUEST for peer `%s' to message queue\n",
574 GNUNET_i2s (&pr->peer));
576 trigger_next_request (h, GNUNET_NO);
581 * The given request hit its timeout. Remove from the
582 * doubly-linked list and call the respective continuation.
584 * @param cls the transmit handle of the request that timed out
585 * @param tc context, can be NULL (!)
588 transmission_timeout (void *cls,
589 const struct GNUNET_SCHEDULER_TaskContext *tc)
591 struct PeerRecord *pr = cls;
592 struct GNUNET_CORE_TransmitHandle *th;
594 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
595 th = pr->pending_head;
596 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
602 "Signalling timeout of request for transmission to CORE service\n");
604 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
605 request_next_transmission (pr);
610 * Transmit the next message to the core service.
613 transmit_message (void *cls,
617 struct GNUNET_CORE_Handle *h = cls;
618 struct ControlMessage *cm;
619 struct GNUNET_CORE_TransmitHandle *th;
620 struct PeerRecord *pr;
621 struct SendMessage *sm;
622 const struct GNUNET_MessageHeader *hdr;
630 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
631 "Transmission failed, initiating reconnect\n");
636 /* first check for control messages */
637 if (NULL != (cm = h->pending_head))
639 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
640 msize = ntohs (hdr->size);
643 trigger_next_request (h, GNUNET_NO);
647 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
648 "Transmitting control message with %u bytes of type %u to core.\n",
649 (unsigned int) msize,
650 (unsigned int) ntohs (hdr->type));
652 memcpy (buf, hdr, msize);
653 GNUNET_CONTAINER_DLL_remove (h->pending_head,
658 if (NULL != cm->cont)
659 GNUNET_SCHEDULER_add_continuation (cm->cont,
661 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
663 trigger_next_request (h, GNUNET_NO);
666 /* now check for 'ready' P2P messages */
667 if (NULL != (pr = h->ready_peer_head))
669 th = pr->pending_head;
670 if (size < th->msize + sizeof (struct SendMessage))
672 trigger_next_request (h, GNUNET_NO);
675 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
678 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
682 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
684 GNUNET_SCHEDULER_cancel (pr->timeout_task);
685 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
688 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
689 "Transmitting SEND request to `%s' with %u bytes.\n",
690 GNUNET_i2s (&pr->peer),
691 (unsigned int) th->msize);
693 sm = (struct SendMessage *) buf;
694 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
695 sm->priority = htonl (th->priority);
696 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
698 ret = th->get_message (th->get_message_cls,
699 size - sizeof (struct SendMessage),
705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
706 "Size of clients message to peer %s is 0!\n",
707 GNUNET_i2s(&pr->peer));
709 /* client decided to send nothing! */
710 request_next_transmission (pr);
714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
715 "Produced SEND message to core with %u bytes payload\n",
718 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
719 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
722 request_next_transmission (pr);
725 ret += sizeof (struct SendMessage);
726 sm->header.size = htons (ret);
727 GNUNET_assert (ret <= size);
729 request_next_transmission (pr);
737 * Check the list of pending requests, send the next
740 * @param h core handle
741 * @param ignore_currently_down transmit message even if not initialized?
744 trigger_next_request (struct GNUNET_CORE_Handle *h,
745 int ignore_currently_down)
749 if ( (GNUNET_YES == h->currently_down) &&
750 (ignore_currently_down == GNUNET_NO) )
753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
754 "Core connection down, not processing queue\n");
761 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
762 "Request pending, not processing queue\n");
766 if (h->pending_head != NULL)
767 msize = ntohs (((struct GNUNET_MessageHeader*) &h->pending_head[1])->size);
768 else if (h->ready_peer_head != NULL)
769 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
774 "Request queue empty, not processing queue\n");
776 return; /* no pending message */
778 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
780 GNUNET_TIME_UNIT_FOREVER_REL,
782 &transmit_message, h);
787 * Handler for notification messages received from the core.
789 * @param cls our "struct GNUNET_CORE_Handle"
790 * @param msg the message received from the core service
793 main_notify_handler (void *cls,
794 const struct GNUNET_MessageHeader *msg)
796 struct GNUNET_CORE_Handle *h = cls;
797 const struct InitReplyMessage *m;
798 const struct ConnectNotifyMessage *cnm;
799 const struct DisconnectNotifyMessage *dnm;
800 const struct NotifyTrafficMessage *ntm;
801 const struct GNUNET_MessageHeader *em;
802 const struct ConfigurationInfoMessage *cim;
803 const struct PeerStatusNotifyMessage *psnm;
804 const struct SendMessageReady *smr;
805 const struct GNUNET_CORE_MessageHandler *mh;
806 GNUNET_CORE_StartupCallback init;
807 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
808 struct PeerRecord *pr;
809 struct GNUNET_CORE_TransmitHandle *th;
817 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
819 ("Client was disconnected from core service, trying to reconnect.\n"));
823 msize = ntohs (msg->size);
825 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
826 "Processing message of type %u and size %u from core service\n",
827 ntohs (msg->type), msize);
829 switch (ntohs (msg->type))
831 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
832 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
838 m = (const struct InitReplyMessage *) msg;
839 GNUNET_break (0 == ntohl (m->reserved));
840 /* start our message processing loop */
841 if (GNUNET_YES == h->currently_down)
843 h->currently_down = GNUNET_NO;
844 trigger_next_request (h, GNUNET_NO);
846 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
847 if (NULL != (init = h->init))
849 /* mark so we don't call init on reconnect */
851 GNUNET_CRYPTO_hash (&m->publicKey,
853 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
857 "Connected to core service of peer `%s'.\n",
858 GNUNET_i2s (&h->me));
860 init (h->cls, h, &h->me, &m->publicKey);
865 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
866 "Successfully reconnected to core service.\n");
870 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
871 if (msize != sizeof (struct ConnectNotifyMessage))
877 cnm = (const struct ConnectNotifyMessage *) msg;
879 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
880 "Received notification about connection from `%s'.\n",
881 GNUNET_i2s (&cnm->peer));
883 if (0 == memcmp (&h->me,
885 sizeof (struct GNUNET_PeerIdentity)))
887 /* disconnect from self!? */
891 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
892 &cnm->peer.hashPubKey);
899 pr = GNUNET_malloc (sizeof (struct PeerRecord));
900 pr->peer = cnm->peer;
902 GNUNET_assert (GNUNET_YES ==
903 GNUNET_CONTAINER_multihashmap_put (h->peers,
904 &cnm->peer.hashPubKey,
906 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
907 if (NULL != h->connects)
910 NULL /* FIXME: atsi! */);
912 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
913 if (msize != sizeof (struct DisconnectNotifyMessage))
919 dnm = (const struct DisconnectNotifyMessage *) msg;
920 if (0 == memcmp (&h->me,
922 sizeof (struct GNUNET_PeerIdentity)))
924 /* connection to self!? */
929 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
930 "Received notification about disconnect from `%s'.\n",
931 GNUNET_i2s (&dnm->peer));
933 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
934 &dnm->peer.hashPubKey);
941 trigger = ( (pr->prev != NULL) ||
942 (pr->next != NULL) ||
943 (h->ready_peer_head == pr) );
944 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
946 trigger_next_request (h, GNUNET_NO);
948 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
949 if (NULL == h->status_events)
954 if (msize != sizeof (struct PeerStatusNotifyMessage))
960 psnm = (const struct PeerStatusNotifyMessage *) msg;
961 if (0 == memcmp (&h->me,
963 sizeof (struct GNUNET_PeerIdentity)))
970 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
971 "Received notification about status change by `%s'.\n",
972 GNUNET_i2s (&psnm->peer));
974 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
975 &psnm->peer.hashPubKey);
982 h->status_events (h->cls,
986 GNUNET_TIME_absolute_ntoh (psnm->timeout),
987 NULL /* FIXME: atsi */);
989 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
991 sizeof (struct NotifyTrafficMessage) +
992 sizeof (struct GNUNET_MessageHeader))
998 ntm = (const struct NotifyTrafficMessage *) msg;
999 if (0 == memcmp (&h->me,
1001 sizeof (struct GNUNET_PeerIdentity)))
1007 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1010 "Received message of type %u and size %u from peer `%4s'\n",
1013 GNUNET_i2s (&ntm->peer));
1015 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1016 &ntm->peer.hashPubKey);
1020 reconnect_later (h);
1023 if ((GNUNET_NO == h->inbound_hdr_only) &&
1024 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1027 reconnect_later (h);
1030 et = ntohs (em->type);
1031 for (hpos = 0; hpos < h->hcnt; hpos++)
1033 mh = &h->handlers[hpos];
1036 if ((mh->expected_size != ntohs (em->size)) &&
1037 (mh->expected_size != 0))
1043 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1044 NULL /* FIXME: atsi */))
1046 /* error in processing, do not process other messages! */
1050 if (NULL != h->inbound_notify)
1051 h->inbound_notify (h->cls, &ntm->peer, em,
1052 NULL /* FIXME: atsi */);
1054 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1056 sizeof (struct NotifyTrafficMessage) +
1057 sizeof (struct GNUNET_MessageHeader))
1060 reconnect_later (h);
1063 ntm = (const struct NotifyTrafficMessage *) msg;
1064 if (0 == memcmp (&h->me,
1066 sizeof (struct GNUNET_PeerIdentity)))
1072 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1073 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1074 &ntm->peer.hashPubKey);
1078 reconnect_later (h);
1082 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1083 "Received notification about transmission to `%s'.\n",
1084 GNUNET_i2s (&ntm->peer));
1086 if ((GNUNET_NO == h->outbound_hdr_only) &&
1087 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1090 reconnect_later (h);
1093 if (NULL == h->outbound_notify)
1098 h->outbound_notify (h->cls, &ntm->peer, em,
1099 NULL /* FIXME: atsi? */);
1101 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1102 if (msize != sizeof (struct SendMessageReady))
1105 reconnect_later (h);
1108 smr = (const struct SendMessageReady *) msg;
1109 if (0 == memcmp (&h->me,
1111 sizeof (struct GNUNET_PeerIdentity)))
1117 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1118 &smr->peer.hashPubKey);
1122 reconnect_later (h);
1126 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1127 "Received notification about transmission readiness to `%s'.\n",
1128 GNUNET_i2s (&smr->peer));
1130 /* FIXME: pr->pending_head is sometimes NULL here... Safe to just return? Or does this indicate something is out of sync somewhere else? */
1131 if (pr->pending_head == NULL)
1134 reconnect_later (h);
1138 th = pr->pending_head;
1139 if (ntohs (smr->smr_id) != th->smr_id)
1141 /* READY message is for expired or cancelled message,
1142 ignore! (we should have already sent another request) */
1145 if ( (pr->prev != NULL) ||
1146 (pr->next != NULL) ||
1147 (h->ready_peer_head == pr) )
1149 /* we should not already be on the ready list... */
1151 reconnect_later (h);
1154 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1157 trigger_next_request (h, GNUNET_NO);
1159 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1160 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1163 reconnect_later (h);
1166 cim = (const struct ConfigurationInfoMessage*) msg;
1167 if (0 == memcmp (&h->me,
1169 sizeof (struct GNUNET_PeerIdentity)))
1176 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1177 "Received notification about configuration update for `%s'.\n",
1178 GNUNET_i2s (&cim->peer));
1180 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1181 &cim->peer.hashPubKey);
1185 reconnect_later (h);
1188 if (pr->rim_id != ntohl (cim->rim_id))
1196 ntohl (cim->reserved_amount),
1197 GNUNET_ntohll (cim->preference));
1200 reconnect_later (h);
1203 GNUNET_CLIENT_receive (h->client,
1204 &main_notify_handler, h,
1205 GNUNET_TIME_UNIT_FOREVER_REL);
1210 * Task executed once we are done transmitting the INIT message.
1211 * Starts our 'receive' loop.
1213 * @param cls the 'struct GNUNET_CORE_Handle'
1214 * @param tc task context
1217 init_done_task (void *cls,
1218 const struct GNUNET_SCHEDULER_TaskContext *tc)
1220 struct GNUNET_CORE_Handle *h = cls;
1224 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_PREREQ_DONE))
1227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1228 "Failed to exchange INIT with core, retrying\n");
1230 reconnect_later (h);
1233 GNUNET_CLIENT_receive (h->client,
1234 &main_notify_handler,
1236 GNUNET_TIME_UNIT_FOREVER_REL);
1241 * Our current client connection went down. Clean it up
1242 * and try to reconnect!
1244 * @param h our handle to the core service
1247 reconnect (struct GNUNET_CORE_Handle *h)
1249 struct ControlMessage *cm;
1250 struct InitMessage *init;
1257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1258 "Reconnecting to CORE service\n");
1260 GNUNET_assert (h->client == NULL);
1261 GNUNET_assert (h->currently_down == GNUNET_YES);
1262 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1263 if (h->client == NULL)
1265 reconnect_later (h);
1268 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1269 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1271 cm->cont = &init_done_task;
1273 init = (struct InitMessage*) &cm[1];
1274 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1275 init->header.size = htons (msize);
1276 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1277 if (h->status_events != NULL)
1278 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1279 if (h->inbound_notify != NULL)
1281 if (h->inbound_hdr_only)
1282 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1284 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1286 if (h->outbound_notify != NULL)
1288 if (h->outbound_hdr_only)
1289 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1291 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1293 init->options = htonl (opt);
1294 ts = (uint16_t *) &init[1];
1295 for (hpos = 0; hpos < h->hcnt; hpos++)
1296 ts[hpos] = htons (h->handlers[hpos].type);
1297 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1300 trigger_next_request (h, GNUNET_YES);
1306 * Connect to the core service. Note that the connection may
1307 * complete (or fail) asynchronously.
1309 * @param cfg configuration to use
1310 * @param queue_size size of the per-peer message queue
1311 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1312 * @param init callback to call on timeout or once we have successfully
1313 * connected to the core service; note that timeout is only meaningful if init is not NULL
1314 * @param connects function to call on peer connect, can be NULL
1315 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1316 * @param status_events function to call on changes to peer connection status, can be NULL
1317 * @param inbound_notify function to call for all inbound messages, can be NULL
1318 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1319 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1320 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1321 * @param outbound_notify function to call for all outbound messages, can be NULL
1322 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1323 * GNUNET_MessageHeader and hence we do not need to give it the full message
1324 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1325 * @param handlers callbacks for messages we care about, NULL-terminated
1326 * @return handle to the core service (only useful for disconnect until 'init' is called);
1327 * NULL on error (in this case, init is never called)
1329 struct GNUNET_CORE_Handle *
1330 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1331 unsigned int queue_size,
1333 GNUNET_CORE_StartupCallback init,
1334 GNUNET_CORE_ConnectEventHandler connects,
1335 GNUNET_CORE_DisconnectEventHandler disconnects,
1336 GNUNET_CORE_PeerStatusEventHandler status_events,
1337 GNUNET_CORE_MessageCallback inbound_notify,
1338 int inbound_hdr_only,
1339 GNUNET_CORE_MessageCallback outbound_notify,
1340 int outbound_hdr_only,
1341 const struct GNUNET_CORE_MessageHandler *handlers)
1343 struct GNUNET_CORE_Handle *h;
1345 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1347 h->queue_size = queue_size;
1350 h->connects = connects;
1351 h->disconnects = disconnects;
1352 h->status_events = status_events;
1353 h->inbound_notify = inbound_notify;
1354 h->outbound_notify = outbound_notify;
1355 h->inbound_hdr_only = inbound_hdr_only;
1356 h->outbound_hdr_only = outbound_hdr_only;
1357 h->handlers = handlers;
1359 h->currently_down = GNUNET_YES;
1360 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1361 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1362 while (handlers[h->hcnt].callback != NULL)
1364 GNUNET_assert (h->hcnt <
1365 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1366 sizeof (struct InitMessage)) / sizeof (uint16_t));
1368 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1369 "Connecting to CORE service\n");
1377 * Disconnect from the core service. This function can only
1378 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1379 * requests have been explicitly canceled.
1381 * @param handle connection to core to disconnect
1384 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1386 struct ControlMessage *cm;
1389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1390 "Disconnecting from CORE service\n");
1392 if (handle->cth != NULL)
1394 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1397 if (handle->client != NULL)
1399 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1400 handle->client = NULL;
1402 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1404 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1405 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1407 while (NULL != (cm = handle->pending_head))
1409 GNUNET_CONTAINER_DLL_remove (handle->pending_head,
1410 handle->pending_tail,
1414 if (cm->cont != NULL)
1415 cm->cont (cm->cont_cls, NULL);
1418 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1419 &disconnect_and_free_peer_entry,
1421 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1422 GNUNET_break (handle->ready_peer_head == NULL);
1423 GNUNET_free (handle);
1428 * Ask the core to call "notify" once it is ready to transmit the
1429 * given number of bytes to the specified "target". If we are not yet
1430 * connected to the specified peer, a call to this function will cause
1431 * us to try to establish a connection.
1433 * @param handle connection to core service
1434 * @param priority how important is the message?
1435 * @param maxdelay how long can the message wait?
1436 * @param target who should receive the message,
1437 * use NULL for this peer (loopback)
1438 * @param notify_size how many bytes of buffer space does notify want?
1439 * @param notify function to call when buffer space is available
1440 * @param notify_cls closure for notify
1441 * @return non-NULL if the notify callback was queued,
1442 * NULL if we can not even queue the request (insufficient
1443 * memory); if NULL is returned, "notify" will NOT be called.
1445 struct GNUNET_CORE_TransmitHandle *
1446 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1448 struct GNUNET_TIME_Relative maxdelay,
1449 const struct GNUNET_PeerIdentity *target,
1451 GNUNET_CONNECTION_TransmitReadyNotify notify,
1454 struct PeerRecord *pr;
1455 struct GNUNET_CORE_TransmitHandle *th;
1456 struct GNUNET_CORE_TransmitHandle *pos;
1457 struct GNUNET_CORE_TransmitHandle *prev;
1458 struct GNUNET_CORE_TransmitHandle *minp;
1460 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1461 &target->hashPubKey);
1464 /* attempt to send to peer that is not connected */
1465 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1466 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1467 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1471 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1472 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1473 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1475 th->get_message = notify;
1476 th->get_message_cls = notify_cls;
1477 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1478 th->priority = priority;
1479 th->msize = notify_size;
1480 /* bound queue size */
1481 if (pr->queue_size == handle->queue_size)
1483 /* find lowest-priority entry */
1484 minp = pr->pending_head;
1486 while (prev != NULL)
1488 if (prev->priority < minp->priority)
1494 GNUNET_break (handle->queue_size != 0);
1495 GNUNET_break (pr->queue_size == 0);
1498 if (priority <= minp->priority)
1501 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1502 "Dropping transmission request: priority too low\n");
1504 return NULL; /* priority too low */
1506 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1511 minp->get_message (minp->get_message_cls,
1516 /* Order entries by deadline, but SKIP 'HEAD' if
1517 we're in the 'ready_peer_*' DLL */
1518 pos = pr->pending_head;
1519 if ( (pr->prev != NULL) ||
1520 (pr->next != NULL) ||
1521 (pr == handle->ready_peer_head) )
1523 GNUNET_assert (pos != NULL);
1524 pos = pos->next; /* skip head */
1527 /* insertion sort */
1529 while ( (pos != NULL) &&
1530 (pos->timeout.abs_value < th->timeout.abs_value) )
1535 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1540 /* was the request queue previously empty? */
1542 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1543 "Transmission request added to queue\n");
1545 if (pr->pending_head == th)
1546 request_next_transmission (pr);
1552 * Cancel the specified transmission-ready notification.
1554 * @param th handle that was returned by "notify_transmit_ready".
1557 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1560 struct PeerRecord *pr = th->peer;
1561 struct GNUNET_CORE_Handle *h = pr->ch;
1564 was_head = (pr->pending_head == th);
1565 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1571 /* we're currently in the control queue, remove */
1572 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1575 GNUNET_free (th->cm);
1580 if ( (pr->prev != NULL) ||
1581 (pr->next != NULL) ||
1582 (pr == h->ready_peer_head) )
1584 /* the request that was 'approved' by core was
1585 cancelled before it could be transmitted; remove
1586 us from the 'ready' list */
1587 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1591 request_next_transmission (pr);
1596 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1599 * Handle for a request to the core to connect to
1600 * a particular peer. Can be used to cancel the request
1601 * (before the 'cont'inuation is called).
1603 struct GNUNET_CORE_PeerRequestHandle
1607 * Link to control message.
1609 struct ControlMessage *cm;
1614 struct GNUNET_CORE_Handle *h;
1617 * Continuation to run when done.
1619 GNUNET_SCHEDULER_Task cont;
1622 * Closure for 'cont'.
1630 * Continuation called when the control message was transmitted.
1631 * Calls the original continuation and frees the remaining
1634 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1635 * @param tc scheduler context
1638 peer_request_connect_cont (void *cls,
1639 const struct GNUNET_SCHEDULER_TaskContext *tc)
1641 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1643 if (ret->cont != NULL)
1646 GNUNET_SCHEDULER_add_now (ret->cont,
1649 ret->cont (ret->cont_cls, tc);
1656 * Request that the core should try to connect to a particular peer.
1657 * Once the request has been transmitted to the core, the continuation
1658 * function will be called. Note that this does NOT mean that a
1659 * connection was successfully established -- it only means that the
1660 * core will now try. Successful establishment of the connection
1661 * will be signalled to the 'connects' callback argument of
1662 * 'GNUNET_CORE_connect' only. If the core service does not respond
1663 * to our connection attempt within the given time frame, 'cont' will
1664 * be called with the TIMEOUT reason code.
1666 * @param h core handle
1667 * @param timeout how long to try to talk to core
1668 * @param peer who should we connect to
1669 * @param cont function to call once the request has been completed (or timed out)
1670 * @param cont_cls closure for cont
1671 * @return NULL on error (cont will not be called), otherwise handle for cancellation
1673 struct GNUNET_CORE_PeerRequestHandle *
1674 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1675 struct GNUNET_TIME_Relative timeout,
1676 const struct GNUNET_PeerIdentity * peer,
1677 GNUNET_SCHEDULER_Task cont,
1680 struct GNUNET_CORE_PeerRequestHandle *ret;
1681 struct ControlMessage *cm;
1682 struct ConnectMessage *msg;
1684 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1685 sizeof (struct ConnectMessage));
1686 msg = (struct ConnectMessage*) &cm[1];
1687 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1688 msg->header.size = htons (sizeof (struct ConnectMessage));
1689 msg->reserved = htonl (0);
1690 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1692 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1695 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1699 ret->cont_cls = cont_cls;
1700 cm->cont = &peer_request_connect_cont;
1703 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1704 "Queueing REQUEST_CONNECT request\n");
1706 if (h->pending_head == cm)
1707 trigger_next_request (h, GNUNET_NO);
1713 * Cancel a pending request to connect to a particular peer. Must not
1714 * be called after the 'cont' function was invoked.
1716 * @param req request handle that was returned for the original request
1719 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1721 struct GNUNET_CORE_Handle *h = req->h;
1722 struct ControlMessage *cm = req->cm;
1724 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1732 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1735 struct GNUNET_CORE_InformationRequestContext
1739 * Our connection to the service.
1741 struct GNUNET_CORE_Handle *h;
1744 * Function to call with the information.
1746 GNUNET_CORE_PeerConfigurationInfoCallback info;
1754 * Link to control message, NULL if CM was sent.
1756 struct ControlMessage *cm;
1759 * Link to peer record.
1761 struct PeerRecord *pr;
1766 * CM was sent, remove link so we don't double-free.
1768 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1769 * @param tc scheduler context
1772 change_preference_send_continuation (void *cls,
1773 const struct GNUNET_SCHEDULER_TaskContext *tc)
1775 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1782 * Obtain statistics and/or change preferences for the given peer.
1784 * @param h core handle
1785 * @param peer identifies the peer
1786 * @param timeout after how long should we give up (and call "info" with NULL
1787 * for "peer" to signal an error)?
1788 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1789 * caller should set "bw_out" to "-1" to avoid changing
1790 * the current value; otherwise "bw_out" will be lowered to
1791 * the specified value; passing a pointer to "0" can be used to force
1792 * us to disconnect from the peer; "bw_out" might not increase
1793 * as specified since the upper bound is generally
1794 * determined by the other peer!
1795 * @param amount reserve N bytes for receiving, negative
1796 * amounts can be used to undo a (recent) reservation;
1797 * @param preference increase incoming traffic share preference by this amount;
1798 * in the absence of "amount" reservations, we use this
1799 * preference value to assign proportional bandwidth shares
1800 * to all connected peers
1801 * @param info function to call with the resulting configuration information
1802 * @param info_cls closure for info
1803 * @return NULL on error
1805 struct GNUNET_CORE_InformationRequestContext *
1806 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1807 const struct GNUNET_PeerIdentity *peer,
1808 struct GNUNET_TIME_Relative timeout,
1809 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1811 uint64_t preference,
1812 GNUNET_CORE_PeerConfigurationInfoCallback info,
1815 struct GNUNET_CORE_InformationRequestContext *irc;
1816 struct PeerRecord *pr;
1817 struct RequestInfoMessage *rim;
1818 struct ControlMessage *cm;
1820 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1824 /* attempt to change preference on peer that is not connected */
1828 if (pr->pcic != NULL)
1830 /* second change before first one is done */
1834 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1838 irc->info_cls = info_cls;
1839 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1840 sizeof (struct RequestInfoMessage));
1841 cm->cont = &change_preference_send_continuation;
1844 rim = (struct RequestInfoMessage*) &cm[1];
1845 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1846 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1847 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1848 rim->limit_outbound = bw_out;
1849 rim->reserve_inbound = htonl (amount);
1850 rim->preference_change = GNUNET_htonll(preference);
1853 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1854 "Queueing CHANGE PREFERENCE request\n");
1856 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1860 pr->pcic_cls = info_cls;
1861 if (h->pending_head == cm)
1862 trigger_next_request (h, GNUNET_NO);
1868 * Cancel request for getting information about a peer.
1869 * Note that an eventual change in preference, trust or bandwidth
1870 * assignment MAY have already been committed at the time,
1871 * so cancelling a request is NOT sure to undo the original
1872 * request. The original request may or may not still commit.
1873 * The only thing cancellation ensures is that the callback
1874 * from the original request will no longer be called.
1876 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1879 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1881 struct GNUNET_CORE_Handle *h = irc->h;
1882 struct PeerRecord *pr = irc->pr;
1884 if (irc->cm != NULL)
1886 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1889 GNUNET_free (irc->cm);
1892 pr->pcic_cls = NULL;
1897 /* end of core_api.c */