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,
472 cm->cont (cm->cont_cls, NULL);
475 if (h->client != NULL)
477 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
479 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
480 &disconnect_and_free_peer_entry,
483 GNUNET_assert (h->pending_head == NULL);
484 h->currently_down = GNUNET_YES;
485 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
486 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
488 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
491 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
496 * Check the list of pending requests, send the next
499 * @param h core handle
500 * @param ignore_currently_down transmit message even if not initialized?
503 trigger_next_request (struct GNUNET_CORE_Handle *h,
504 int ignore_currently_down);
508 * The given request hit its timeout. Remove from the
509 * doubly-linked list and call the respective continuation.
511 * @param cls the transmit handle of the request that timed out
512 * @param tc context, can be NULL (!)
515 transmission_timeout (void *cls,
516 const struct GNUNET_SCHEDULER_TaskContext *tc);
520 * Control message was sent, mark it as such.
522 * @param cls the 'struct GNUNET_CORE_TransmitHandle*'
523 * @param tc scheduler context
526 mark_control_message_sent (void *cls,
527 const struct GNUNET_SCHEDULER_TaskContext *tc)
529 struct GNUNET_CORE_TransmitHandle *th = cls;
536 * Send a control message to the peer asking for transmission
537 * of the message in the given peer record.
539 * @param pr peer to request transmission to
542 request_next_transmission (struct PeerRecord *pr)
544 struct GNUNET_CORE_Handle *h = pr->ch;
545 struct ControlMessage *cm;
546 struct SendMessageRequest *smr;
547 struct GNUNET_CORE_TransmitHandle *th;
549 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
551 GNUNET_SCHEDULER_cancel (pr->timeout_task);
552 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
554 if (NULL == (th = pr->pending_head))
556 trigger_next_request (h, GNUNET_NO);
559 GNUNET_assert (pr->prev == NULL);
560 GNUNET_assert (pr->next == NULL);
561 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
562 &transmission_timeout,
564 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
565 sizeof (struct SendMessageRequest));
566 cm->cont = &mark_control_message_sent;
570 smr = (struct SendMessageRequest*) &cm[1];
571 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
572 smr->header.size = htons (sizeof (struct SendMessageRequest));
573 smr->priority = htonl (th->priority);
574 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
575 smr->peer = pr->peer;
576 smr->queue_size = htonl (pr->queue_size);
577 smr->size = htons (th->msize);
578 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
579 GNUNET_CONTAINER_DLL_insert_after (h->pending_head,
584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
585 "Adding SEND REQUEST for peer `%s' to message queue\n",
586 GNUNET_i2s (&pr->peer));
588 trigger_next_request (h, GNUNET_NO);
593 * The given request hit its timeout. Remove from the
594 * doubly-linked list and call the respective continuation.
596 * @param cls the transmit handle of the request that timed out
597 * @param tc context, can be NULL (!)
600 transmission_timeout (void *cls,
601 const struct GNUNET_SCHEDULER_TaskContext *tc)
603 struct PeerRecord *pr = cls;
604 struct GNUNET_CORE_TransmitHandle *th;
606 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
607 th = pr->pending_head;
608 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
614 "Signalling timeout of request for transmission to CORE service\n");
616 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
617 request_next_transmission (pr);
622 * Transmit the next message to the core service.
625 transmit_message (void *cls,
629 struct GNUNET_CORE_Handle *h = cls;
630 struct ControlMessage *cm;
631 struct GNUNET_CORE_TransmitHandle *th;
632 struct PeerRecord *pr;
633 struct SendMessage *sm;
634 const struct GNUNET_MessageHeader *hdr;
642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
643 "Transmission failed, initiating reconnect\n");
648 /* first check for control messages */
649 if (NULL != (cm = h->pending_head))
651 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
652 msize = ntohs (hdr->size);
655 trigger_next_request (h, GNUNET_NO);
659 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
660 "Transmitting control message with %u bytes of type %u to core.\n",
661 (unsigned int) msize,
662 (unsigned int) ntohs (hdr->type));
664 memcpy (buf, hdr, msize);
665 GNUNET_CONTAINER_DLL_remove (h->pending_head,
670 if (NULL != cm->cont)
671 GNUNET_SCHEDULER_add_continuation (cm->cont,
673 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
675 trigger_next_request (h, GNUNET_NO);
678 /* now check for 'ready' P2P messages */
679 if (NULL != (pr = h->ready_peer_head))
681 th = pr->pending_head;
682 if (size < th->msize + sizeof (struct SendMessage))
684 trigger_next_request (h, GNUNET_NO);
687 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
690 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
694 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
696 GNUNET_SCHEDULER_cancel (pr->timeout_task);
697 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
701 "Transmitting SEND request to `%s' with %u bytes.\n",
702 GNUNET_i2s (&pr->peer),
703 (unsigned int) th->msize);
705 sm = (struct SendMessage *) buf;
706 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
707 sm->priority = htonl (th->priority);
708 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
710 ret = th->get_message (th->get_message_cls,
711 size - sizeof (struct SendMessage),
717 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
718 "Size of clients message to peer %s is 0!\n",
719 GNUNET_i2s(&pr->peer));
721 /* client decided to send nothing! */
722 request_next_transmission (pr);
726 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
727 "Produced SEND message to core with %u bytes payload\n",
730 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
731 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
734 request_next_transmission (pr);
737 ret += sizeof (struct SendMessage);
738 sm->header.size = htons (ret);
739 GNUNET_assert (ret <= size);
741 request_next_transmission (pr);
749 * Check the list of pending requests, send the next
752 * @param h core handle
753 * @param ignore_currently_down transmit message even if not initialized?
756 trigger_next_request (struct GNUNET_CORE_Handle *h,
757 int ignore_currently_down)
761 if ( (GNUNET_YES == h->currently_down) &&
762 (ignore_currently_down == GNUNET_NO) )
765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
766 "Core connection down, not processing queue\n");
773 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
774 "Request pending, not processing queue\n");
778 if (h->pending_head != NULL)
779 msize = ntohs (((struct GNUNET_MessageHeader*) &h->pending_head[1])->size);
780 else if (h->ready_peer_head != NULL)
781 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
785 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
786 "Request queue empty, not processing queue\n");
788 return; /* no pending message */
790 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
792 GNUNET_TIME_UNIT_FOREVER_REL,
794 &transmit_message, h);
799 * Handler for notification messages received from the core.
801 * @param cls our "struct GNUNET_CORE_Handle"
802 * @param msg the message received from the core service
805 main_notify_handler (void *cls,
806 const struct GNUNET_MessageHeader *msg)
808 struct GNUNET_CORE_Handle *h = cls;
809 const struct InitReplyMessage *m;
810 const struct ConnectNotifyMessage *cnm;
811 const struct DisconnectNotifyMessage *dnm;
812 const struct NotifyTrafficMessage *ntm;
813 const struct GNUNET_MessageHeader *em;
814 const struct ConfigurationInfoMessage *cim;
815 const struct PeerStatusNotifyMessage *psnm;
816 const struct SendMessageReady *smr;
817 const struct GNUNET_CORE_MessageHandler *mh;
818 GNUNET_CORE_StartupCallback init;
819 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
820 struct PeerRecord *pr;
821 struct GNUNET_CORE_TransmitHandle *th;
829 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
831 ("Client was disconnected from core service, trying to reconnect.\n"));
835 msize = ntohs (msg->size);
837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
838 "Processing message of type %u and size %u from core service\n",
839 ntohs (msg->type), msize);
841 switch (ntohs (msg->type))
843 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
844 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
850 m = (const struct InitReplyMessage *) msg;
851 GNUNET_break (0 == ntohl (m->reserved));
852 /* start our message processing loop */
853 if (GNUNET_YES == h->currently_down)
855 h->currently_down = GNUNET_NO;
856 trigger_next_request (h, GNUNET_NO);
858 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
859 if (NULL != (init = h->init))
861 /* mark so we don't call init on reconnect */
863 GNUNET_CRYPTO_hash (&m->publicKey,
865 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Connected to core service of peer `%s'.\n",
870 GNUNET_i2s (&h->me));
872 init (h->cls, h, &h->me, &m->publicKey);
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
878 "Successfully reconnected to core service.\n");
882 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
883 if (msize != sizeof (struct ConnectNotifyMessage))
889 cnm = (const struct ConnectNotifyMessage *) msg;
891 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
892 "Received notification about connection from `%s'.\n",
893 GNUNET_i2s (&cnm->peer));
895 if (0 == memcmp (&h->me,
897 sizeof (struct GNUNET_PeerIdentity)))
899 /* disconnect from self!? */
903 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
904 &cnm->peer.hashPubKey);
911 pr = GNUNET_malloc (sizeof (struct PeerRecord));
912 pr->peer = cnm->peer;
914 GNUNET_assert (GNUNET_YES ==
915 GNUNET_CONTAINER_multihashmap_put (h->peers,
916 &cnm->peer.hashPubKey,
918 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
919 if (NULL != h->connects)
922 NULL /* FIXME: atsi! */);
924 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
925 if (msize != sizeof (struct DisconnectNotifyMessage))
931 dnm = (const struct DisconnectNotifyMessage *) msg;
932 if (0 == memcmp (&h->me,
934 sizeof (struct GNUNET_PeerIdentity)))
936 /* connection to self!? */
941 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
942 "Received notification about disconnect from `%s'.\n",
943 GNUNET_i2s (&dnm->peer));
945 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
946 &dnm->peer.hashPubKey);
953 trigger = ( (pr->prev != NULL) ||
954 (pr->next != NULL) ||
955 (h->ready_peer_head == pr) );
956 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
958 trigger_next_request (h, GNUNET_NO);
960 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
961 if (NULL == h->status_events)
966 if (msize != sizeof (struct PeerStatusNotifyMessage))
972 psnm = (const struct PeerStatusNotifyMessage *) msg;
973 if (0 == memcmp (&h->me,
975 sizeof (struct GNUNET_PeerIdentity)))
982 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
983 "Received notification about status change by `%s'.\n",
984 GNUNET_i2s (&psnm->peer));
986 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
987 &psnm->peer.hashPubKey);
994 h->status_events (h->cls,
998 GNUNET_TIME_absolute_ntoh (psnm->timeout),
999 NULL /* FIXME: atsi */);
1001 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1003 sizeof (struct NotifyTrafficMessage) +
1004 sizeof (struct GNUNET_MessageHeader))
1007 reconnect_later (h);
1010 ntm = (const struct NotifyTrafficMessage *) msg;
1011 if (0 == memcmp (&h->me,
1013 sizeof (struct GNUNET_PeerIdentity)))
1019 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1021 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1022 "Received message of type %u and size %u from peer `%4s'\n",
1025 GNUNET_i2s (&ntm->peer));
1027 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1028 &ntm->peer.hashPubKey);
1032 reconnect_later (h);
1035 if ((GNUNET_NO == h->inbound_hdr_only) &&
1036 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1039 reconnect_later (h);
1042 et = ntohs (em->type);
1043 for (hpos = 0; hpos < h->hcnt; hpos++)
1045 mh = &h->handlers[hpos];
1048 if ((mh->expected_size != ntohs (em->size)) &&
1049 (mh->expected_size != 0))
1055 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1056 NULL /* FIXME: atsi */))
1058 /* error in processing, do not process other messages! */
1062 if (NULL != h->inbound_notify)
1063 h->inbound_notify (h->cls, &ntm->peer, em,
1064 NULL /* FIXME: atsi */);
1066 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1068 sizeof (struct NotifyTrafficMessage) +
1069 sizeof (struct GNUNET_MessageHeader))
1072 reconnect_later (h);
1075 ntm = (const struct NotifyTrafficMessage *) msg;
1076 if (0 == memcmp (&h->me,
1078 sizeof (struct GNUNET_PeerIdentity)))
1084 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1085 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1086 &ntm->peer.hashPubKey);
1090 reconnect_later (h);
1094 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1095 "Received notification about transmission to `%s'.\n",
1096 GNUNET_i2s (&ntm->peer));
1098 if ((GNUNET_NO == h->outbound_hdr_only) &&
1099 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1102 reconnect_later (h);
1105 if (NULL == h->outbound_notify)
1110 h->outbound_notify (h->cls, &ntm->peer, em,
1111 NULL /* FIXME: atsi? */);
1113 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1114 if (msize != sizeof (struct SendMessageReady))
1117 reconnect_later (h);
1120 smr = (const struct SendMessageReady *) msg;
1121 if (0 == memcmp (&h->me,
1123 sizeof (struct GNUNET_PeerIdentity)))
1129 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1130 &smr->peer.hashPubKey);
1134 reconnect_later (h);
1138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1139 "Received notification about transmission readiness to `%s'.\n",
1140 GNUNET_i2s (&smr->peer));
1142 th = pr->pending_head;
1143 if (ntohs (smr->smr_id) != th->smr_id)
1145 /* READY message is for expired or cancelled message,
1146 ignore! (we should have already sent another request) */
1149 if ( (pr->prev != NULL) ||
1150 (pr->next != NULL) ||
1151 (h->ready_peer_head == pr) )
1153 /* we should not already be on the ready list... */
1155 reconnect_later (h);
1158 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1161 trigger_next_request (h, GNUNET_NO);
1163 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1164 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1167 reconnect_later (h);
1170 cim = (const struct ConfigurationInfoMessage*) msg;
1171 if (0 == memcmp (&h->me,
1173 sizeof (struct GNUNET_PeerIdentity)))
1180 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1181 "Received notification about configuration update for `%s'.\n",
1182 GNUNET_i2s (&cim->peer));
1184 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1185 &cim->peer.hashPubKey);
1189 reconnect_later (h);
1192 if (pr->rim_id != ntohl (cim->rim_id))
1200 ntohl (cim->reserved_amount),
1201 GNUNET_ntohll (cim->preference));
1204 reconnect_later (h);
1207 GNUNET_CLIENT_receive (h->client,
1208 &main_notify_handler, h,
1209 GNUNET_TIME_UNIT_FOREVER_REL);
1214 * Task executed once we are done transmitting the INIT message.
1215 * Starts our 'receive' loop.
1217 * @param cls the 'struct GNUNET_CORE_Handle'
1218 * @param tc task context
1221 init_done_task (void *cls,
1222 const struct GNUNET_SCHEDULER_TaskContext *tc)
1224 struct GNUNET_CORE_Handle *h = cls;
1228 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_PREREQ_DONE))
1231 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1232 "Failed to exchange INIT with core, retrying\n");
1234 reconnect_later (h);
1237 GNUNET_CLIENT_receive (h->client,
1238 &main_notify_handler,
1240 GNUNET_TIME_UNIT_FOREVER_REL);
1245 * Our current client connection went down. Clean it up
1246 * and try to reconnect!
1248 * @param h our handle to the core service
1251 reconnect (struct GNUNET_CORE_Handle *h)
1253 struct ControlMessage *cm;
1254 struct InitMessage *init;
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Reconnecting to CORE service\n");
1264 GNUNET_assert (h->client == NULL);
1265 GNUNET_assert (h->currently_down == GNUNET_YES);
1266 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1267 if (h->client == NULL)
1269 reconnect_later (h);
1272 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1273 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1275 cm->cont = &init_done_task;
1277 init = (struct InitMessage*) &cm[1];
1278 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1279 init->header.size = htons (msize);
1280 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1281 if (h->status_events != NULL)
1282 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1283 if (h->inbound_notify != NULL)
1285 if (h->inbound_hdr_only)
1286 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1288 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1290 if (h->outbound_notify != NULL)
1292 if (h->outbound_hdr_only)
1293 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1295 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1297 init->options = htonl (opt);
1298 ts = (uint16_t *) &init[1];
1299 for (hpos = 0; hpos < h->hcnt; hpos++)
1300 ts[hpos] = htons (h->handlers[hpos].type);
1301 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1304 trigger_next_request (h, GNUNET_YES);
1310 * Connect to the core service. Note that the connection may
1311 * complete (or fail) asynchronously.
1313 * @param cfg configuration to use
1314 * @param queue_size size of the per-peer message queue
1315 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1316 * @param init callback to call on timeout or once we have successfully
1317 * connected to the core service; note that timeout is only meaningful if init is not NULL
1318 * @param connects function to call on peer connect, can be NULL
1319 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1320 * @param status_events function to call on changes to peer connection status, can be NULL
1321 * @param inbound_notify function to call for all inbound messages, can be NULL
1322 * @param inbound_hdr_only set to GNUNET_YES if inbound_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 inbound_notify is NULLL
1325 * @param outbound_notify function to call for all outbound messages, can be NULL
1326 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1327 * GNUNET_MessageHeader and hence we do not need to give it the full message
1328 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1329 * @param handlers callbacks for messages we care about, NULL-terminated
1330 * @return handle to the core service (only useful for disconnect until 'init' is called);
1331 * NULL on error (in this case, init is never called)
1333 struct GNUNET_CORE_Handle *
1334 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1335 unsigned int queue_size,
1337 GNUNET_CORE_StartupCallback init,
1338 GNUNET_CORE_ConnectEventHandler connects,
1339 GNUNET_CORE_DisconnectEventHandler disconnects,
1340 GNUNET_CORE_PeerStatusEventHandler status_events,
1341 GNUNET_CORE_MessageCallback inbound_notify,
1342 int inbound_hdr_only,
1343 GNUNET_CORE_MessageCallback outbound_notify,
1344 int outbound_hdr_only,
1345 const struct GNUNET_CORE_MessageHandler *handlers)
1347 struct GNUNET_CORE_Handle *h;
1349 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1351 h->queue_size = queue_size;
1354 h->connects = connects;
1355 h->disconnects = disconnects;
1356 h->status_events = status_events;
1357 h->inbound_notify = inbound_notify;
1358 h->outbound_notify = outbound_notify;
1359 h->inbound_hdr_only = inbound_hdr_only;
1360 h->outbound_hdr_only = outbound_hdr_only;
1361 h->handlers = handlers;
1363 h->currently_down = GNUNET_YES;
1364 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1365 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1366 while (handlers[h->hcnt].callback != NULL)
1368 GNUNET_assert (h->hcnt <
1369 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1370 sizeof (struct InitMessage)) / sizeof (uint16_t));
1372 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1373 "Connecting to CORE service\n");
1381 * Disconnect from the core service. This function can only
1382 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1383 * requests have been explicitly cancelled.
1385 * @param handle connection to core to disconnect
1388 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1390 struct ControlMessage *cm;
1393 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1394 "Disconnecting from CORE service\n");
1396 if (handle->cth != NULL)
1398 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1401 if (handle->client != NULL)
1403 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1404 handle->client = NULL;
1406 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1408 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1409 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1411 while (NULL != (cm = handle->pending_head))
1413 GNUNET_CONTAINER_DLL_remove (handle->pending_head,
1414 handle->pending_tail,
1418 cm->cont (cm->cont_cls, NULL);
1421 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1422 &disconnect_and_free_peer_entry,
1424 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1425 GNUNET_break (handle->ready_peer_head == NULL);
1426 GNUNET_free (handle);
1431 * Ask the core to call "notify" once it is ready to transmit the
1432 * given number of bytes to the specified "target". If we are not yet
1433 * connected to the specified peer, a call to this function will cause
1434 * us to try to establish a connection.
1436 * @param handle connection to core service
1437 * @param priority how important is the message?
1438 * @param maxdelay how long can the message wait?
1439 * @param target who should receive the message,
1440 * use NULL for this peer (loopback)
1441 * @param notify_size how many bytes of buffer space does notify want?
1442 * @param notify function to call when buffer space is available
1443 * @param notify_cls closure for notify
1444 * @return non-NULL if the notify callback was queued,
1445 * NULL if we can not even queue the request (insufficient
1446 * memory); if NULL is returned, "notify" will NOT be called.
1448 struct GNUNET_CORE_TransmitHandle *
1449 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1451 struct GNUNET_TIME_Relative maxdelay,
1452 const struct GNUNET_PeerIdentity *target,
1454 GNUNET_CONNECTION_TransmitReadyNotify notify,
1457 struct PeerRecord *pr;
1458 struct GNUNET_CORE_TransmitHandle *th;
1459 struct GNUNET_CORE_TransmitHandle *pos;
1460 struct GNUNET_CORE_TransmitHandle *prev;
1461 struct GNUNET_CORE_TransmitHandle *minp;
1463 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1464 &target->hashPubKey);
1467 /* attempt to send to peer that is not connected */
1468 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1469 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1470 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1474 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1475 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1476 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1478 th->get_message = notify;
1479 th->get_message_cls = notify_cls;
1480 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1481 th->priority = priority;
1482 th->msize = notify_size;
1483 /* bound queue size */
1484 if (pr->queue_size == handle->queue_size)
1486 /* find lowest-priority entry */
1487 minp = pr->pending_head;
1489 while (prev != NULL)
1491 if (prev->priority < minp->priority)
1497 GNUNET_break (handle->queue_size != 0);
1498 GNUNET_break (pr->queue_size == 0);
1501 if (priority <= minp->priority)
1504 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1505 "Dropping transmission request: priority too low\n");
1507 return NULL; /* priority too low */
1509 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1514 minp->get_message (minp->get_message_cls,
1519 /* Order entries by deadline, but SKIP 'HEAD' if
1520 we're in the 'ready_peer_*' DLL */
1521 pos = pr->pending_head;
1522 if ( (pr->prev != NULL) ||
1523 (pr->next != NULL) ||
1524 (pr == handle->ready_peer_head) )
1526 GNUNET_assert (pos != NULL);
1527 pos = pos->next; /* skip head */
1530 /* insertion sort */
1532 while ( (pos != NULL) &&
1533 (pos->timeout.abs_value < th->timeout.abs_value) )
1538 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1543 /* was the request queue previously empty? */
1545 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1546 "Transmission request added to queue\n");
1548 if (pr->pending_head == th)
1549 request_next_transmission (pr);
1555 * Cancel the specified transmission-ready notification.
1557 * @param th handle that was returned by "notify_transmit_ready".
1560 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1563 struct PeerRecord *pr = th->peer;
1564 struct GNUNET_CORE_Handle *h = pr->ch;
1567 was_head = (pr->pending_head == th);
1568 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1574 /* we're currently in the control queue, remove */
1575 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1578 GNUNET_free (th->cm);
1583 if ( (pr->prev != NULL) ||
1584 (pr->next != NULL) ||
1585 (pr == h->ready_peer_head) )
1587 /* the request that was 'approved' by core was
1588 cancelled before it could be transmitted; remove
1589 us from the 'ready' list */
1590 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1594 request_next_transmission (pr);
1599 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1602 * Handle for a request to the core to connect to
1603 * a particular peer. Can be used to cancel the request
1604 * (before the 'cont'inuation is called).
1606 struct GNUNET_CORE_PeerRequestHandle
1610 * Link to control message.
1612 struct ControlMessage *cm;
1617 struct GNUNET_CORE_Handle *h;
1620 * Continuation to run when done.
1622 GNUNET_SCHEDULER_Task cont;
1625 * Closure for 'cont'.
1633 * Continuation called when the control message was transmitted.
1634 * Calls the original continuation and frees the remaining
1637 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1638 * @param tc scheduler context
1641 peer_request_connect_cont (void *cls,
1642 const struct GNUNET_SCHEDULER_TaskContext *tc)
1644 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1646 if (ret->cont != NULL)
1649 GNUNET_SCHEDULER_add_now (ret->cont,
1652 ret->cont (ret->cont_cls, tc);
1659 * Request that the core should try to connect to a particular peer.
1660 * Once the request has been transmitted to the core, the continuation
1661 * function will be called. Note that this does NOT mean that a
1662 * connection was successfully established -- it only means that the
1663 * core will now try. Successful establishment of the connection
1664 * will be signalled to the 'connects' callback argument of
1665 * 'GNUNET_CORE_connect' only. If the core service does not respond
1666 * to our connection attempt within the given time frame, 'cont' will
1667 * be called with the TIMEOUT reason code.
1669 * @param h core handle
1670 * @param timeout how long to try to talk to core
1671 * @param peer who should we connect to
1672 * @param cont function to call once the request has been completed (or timed out)
1673 * @param cont_cls closure for cont
1674 * @return NULL on error (cont will not be called), otherwise handle for cancellation
1676 struct GNUNET_CORE_PeerRequestHandle *
1677 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1678 struct GNUNET_TIME_Relative timeout,
1679 const struct GNUNET_PeerIdentity * peer,
1680 GNUNET_SCHEDULER_Task cont,
1683 struct GNUNET_CORE_PeerRequestHandle *ret;
1684 struct ControlMessage *cm;
1685 struct ConnectMessage *msg;
1687 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1688 sizeof (struct ConnectMessage));
1689 msg = (struct ConnectMessage*) &cm[1];
1690 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1691 msg->header.size = htons (sizeof (struct ConnectMessage));
1692 msg->reserved = htonl (0);
1693 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1695 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1698 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1702 ret->cont_cls = cont_cls;
1703 cm->cont = &peer_request_connect_cont;
1706 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1707 "Queueing REQUEST_CONNECT request\n");
1709 if (h->pending_head == cm)
1710 trigger_next_request (h, GNUNET_NO);
1716 * Cancel a pending request to connect to a particular peer. Must not
1717 * be called after the 'cont' function was invoked.
1719 * @param req request handle that was returned for the original request
1722 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1724 struct GNUNET_CORE_Handle *h = req->h;
1725 struct ControlMessage *cm = req->cm;
1727 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1735 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1738 struct GNUNET_CORE_InformationRequestContext
1742 * Our connection to the service.
1744 struct GNUNET_CORE_Handle *h;
1747 * Function to call with the information.
1749 GNUNET_CORE_PeerConfigurationInfoCallback info;
1757 * Link to control message, NULL if CM was sent.
1759 struct ControlMessage *cm;
1762 * Link to peer record.
1764 struct PeerRecord *pr;
1769 * CM was sent, remove link so we don't double-free.
1771 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1772 * @param tc scheduler context
1775 change_preference_send_continuation (void *cls,
1776 const struct GNUNET_SCHEDULER_TaskContext *tc)
1778 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1785 * Obtain statistics and/or change preferences for the given peer.
1787 * @param h core handle
1788 * @param peer identifies the peer
1789 * @param timeout after how long should we give up (and call "info" with NULL
1790 * for "peer" to signal an error)?
1791 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1792 * caller should set "bw_out" to "-1" to avoid changing
1793 * the current value; otherwise "bw_out" will be lowered to
1794 * the specified value; passing a pointer to "0" can be used to force
1795 * us to disconnect from the peer; "bw_out" might not increase
1796 * as specified since the upper bound is generally
1797 * determined by the other peer!
1798 * @param amount reserve N bytes for receiving, negative
1799 * amounts can be used to undo a (recent) reservation;
1800 * @param preference increase incoming traffic share preference by this amount;
1801 * in the absence of "amount" reservations, we use this
1802 * preference value to assign proportional bandwidth shares
1803 * to all connected peers
1804 * @param info function to call with the resulting configuration information
1805 * @param info_cls closure for info
1806 * @return NULL on error
1808 struct GNUNET_CORE_InformationRequestContext *
1809 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1810 const struct GNUNET_PeerIdentity *peer,
1811 struct GNUNET_TIME_Relative timeout,
1812 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1814 uint64_t preference,
1815 GNUNET_CORE_PeerConfigurationInfoCallback info,
1818 struct GNUNET_CORE_InformationRequestContext *irc;
1819 struct PeerRecord *pr;
1820 struct RequestInfoMessage *rim;
1821 struct ControlMessage *cm;
1823 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1827 /* attempt to change preference on peer that is not connected */
1831 if (pr->pcic != NULL)
1833 /* second change before first one is done */
1837 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1841 irc->info_cls = info_cls;
1842 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1843 sizeof (struct RequestInfoMessage));
1844 cm->cont = &change_preference_send_continuation;
1847 rim = (struct RequestInfoMessage*) &cm[1];
1848 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1849 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1850 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1851 rim->limit_outbound = bw_out;
1852 rim->reserve_inbound = htonl (amount);
1853 rim->preference_change = GNUNET_htonll(preference);
1856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1857 "Queueing CHANGE PREFERENCE request\n");
1859 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1863 pr->pcic_cls = info_cls;
1864 if (h->pending_head == cm)
1865 trigger_next_request (h, GNUNET_NO);
1871 * Cancel request for getting information about a peer.
1872 * Note that an eventual change in preference, trust or bandwidth
1873 * assignment MAY have already been committed at the time,
1874 * so cancelling a request is NOT sure to undo the original
1875 * request. The original request may or may not still commit.
1876 * The only thing cancellation ensures is that the callback
1877 * from the original request will no longer be called.
1879 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1882 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1884 struct GNUNET_CORE_Handle *h = irc->h;
1885 struct PeerRecord *pr = irc->pr;
1887 if (irc->cm != NULL)
1889 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1892 GNUNET_free (irc->cm);
1895 pr->pcic_cls = NULL;
1900 /* end of core_api.c */