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;
466 struct PeerRecord *pr;
468 while (NULL != (cm = h->pending_head))
470 GNUNET_CONTAINER_DLL_remove (h->pending_head,
475 if (cm->cont != NULL)
476 cm->cont (cm->cont_cls, NULL);
479 if (h->client != NULL)
481 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
484 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
485 &disconnect_and_free_peer_entry,
488 while (NULL != (pr = h->ready_peer_head))
489 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
493 GNUNET_assert (h->pending_head == NULL);
494 h->currently_down = GNUNET_YES;
495 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
496 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
498 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
501 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
506 * Check the list of pending requests, send the next
509 * @param h core handle
510 * @param ignore_currently_down transmit message even if not initialized?
513 trigger_next_request (struct GNUNET_CORE_Handle *h,
514 int ignore_currently_down);
518 * The given request hit its timeout. Remove from the
519 * doubly-linked list and call the respective continuation.
521 * @param cls the transmit handle of the request that timed out
522 * @param tc context, can be NULL (!)
525 transmission_timeout (void *cls,
526 const struct GNUNET_SCHEDULER_TaskContext *tc);
530 * Send a control message to the peer asking for transmission
531 * of the message in the given peer record.
533 * @param pr peer to request transmission to
536 request_next_transmission (struct PeerRecord *pr)
538 struct GNUNET_CORE_Handle *h = pr->ch;
539 struct ControlMessage *cm;
540 struct SendMessageRequest *smr;
541 struct GNUNET_CORE_TransmitHandle *th;
543 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
545 GNUNET_SCHEDULER_cancel (pr->timeout_task);
546 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
548 if (NULL == (th = pr->pending_head))
550 trigger_next_request (h, GNUNET_NO);
553 GNUNET_assert (pr->prev == NULL);
554 GNUNET_assert (pr->next == NULL);
555 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
556 &transmission_timeout,
558 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
559 sizeof (struct SendMessageRequest));
562 smr = (struct SendMessageRequest*) &cm[1];
563 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
564 smr->header.size = htons (sizeof (struct SendMessageRequest));
565 smr->priority = htonl (th->priority);
566 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
567 smr->peer = pr->peer;
568 smr->queue_size = htonl (pr->queue_size);
569 smr->size = htons (th->msize);
570 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
571 GNUNET_CONTAINER_DLL_insert_after (h->pending_head,
576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
577 "Adding SEND REQUEST for peer `%s' to message queue\n",
578 GNUNET_i2s (&pr->peer));
580 trigger_next_request (h, GNUNET_NO);
585 * The given request hit its timeout. Remove from the
586 * doubly-linked list and call the respective continuation.
588 * @param cls the transmit handle of the request that timed out
589 * @param tc context, can be NULL (!)
592 transmission_timeout (void *cls,
593 const struct GNUNET_SCHEDULER_TaskContext *tc)
595 struct PeerRecord *pr = cls;
596 struct GNUNET_CORE_TransmitHandle *th;
598 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
599 th = pr->pending_head;
600 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
606 "Signalling timeout of request for transmission to CORE service\n");
608 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
609 request_next_transmission (pr);
614 * Transmit the next message to the core service.
617 transmit_message (void *cls,
621 struct GNUNET_CORE_Handle *h = cls;
622 struct ControlMessage *cm;
623 struct GNUNET_CORE_TransmitHandle *th;
624 struct PeerRecord *pr;
625 struct SendMessage *sm;
626 const struct GNUNET_MessageHeader *hdr;
634 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
635 "Transmission failed, initiating reconnect\n");
640 /* first check for control messages */
641 if (NULL != (cm = h->pending_head))
643 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
644 msize = ntohs (hdr->size);
647 trigger_next_request (h, GNUNET_NO);
651 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
652 "Transmitting control message with %u bytes of type %u to core.\n",
653 (unsigned int) msize,
654 (unsigned int) ntohs (hdr->type));
656 memcpy (buf, hdr, msize);
657 GNUNET_CONTAINER_DLL_remove (h->pending_head,
662 if (NULL != cm->cont)
663 GNUNET_SCHEDULER_add_continuation (cm->cont,
665 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
667 trigger_next_request (h, GNUNET_NO);
670 /* now check for 'ready' P2P messages */
671 if (NULL != (pr = h->ready_peer_head))
673 GNUNET_assert (pr->pending_head != NULL);
674 th = pr->pending_head;
675 if (size < th->msize + sizeof (struct SendMessage))
677 trigger_next_request (h, GNUNET_NO);
680 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
683 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
687 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
689 GNUNET_SCHEDULER_cancel (pr->timeout_task);
690 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
693 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
694 "Transmitting SEND request to `%s' with %u bytes.\n",
695 GNUNET_i2s (&pr->peer),
696 (unsigned int) th->msize);
698 sm = (struct SendMessage *) buf;
699 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
700 sm->priority = htonl (th->priority);
701 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
703 ret = th->get_message (th->get_message_cls,
704 size - sizeof (struct SendMessage),
710 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
711 "Size of clients message to peer %s is 0!\n",
712 GNUNET_i2s(&pr->peer));
714 /* client decided to send nothing! */
715 request_next_transmission (pr);
719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
720 "Produced SEND message to core with %u bytes payload\n",
723 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
724 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
727 request_next_transmission (pr);
730 ret += sizeof (struct SendMessage);
731 sm->header.size = htons (ret);
732 GNUNET_assert (ret <= size);
734 request_next_transmission (pr);
742 * Check the list of pending requests, send the next
745 * @param h core handle
746 * @param ignore_currently_down transmit message even if not initialized?
749 trigger_next_request (struct GNUNET_CORE_Handle *h,
750 int ignore_currently_down)
754 if ( (GNUNET_YES == h->currently_down) &&
755 (ignore_currently_down == GNUNET_NO) )
758 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
759 "Core connection down, not processing queue\n");
766 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
767 "Request pending, not processing queue\n");
771 if (h->pending_head != NULL)
772 msize = ntohs (((struct GNUNET_MessageHeader*) &h->pending_head[1])->size);
773 else if (h->ready_peer_head != NULL)
774 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
778 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
779 "Request queue empty, not processing queue\n");
781 return; /* no pending message */
783 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
785 GNUNET_TIME_UNIT_FOREVER_REL,
787 &transmit_message, h);
792 * Handler for notification messages received from the core.
794 * @param cls our "struct GNUNET_CORE_Handle"
795 * @param msg the message received from the core service
798 main_notify_handler (void *cls,
799 const struct GNUNET_MessageHeader *msg)
801 struct GNUNET_CORE_Handle *h = cls;
802 const struct InitReplyMessage *m;
803 const struct ConnectNotifyMessage *cnm;
804 const struct DisconnectNotifyMessage *dnm;
805 const struct NotifyTrafficMessage *ntm;
806 const struct GNUNET_MessageHeader *em;
807 const struct ConfigurationInfoMessage *cim;
808 const struct PeerStatusNotifyMessage *psnm;
809 const struct SendMessageReady *smr;
810 const struct GNUNET_CORE_MessageHandler *mh;
811 GNUNET_CORE_StartupCallback init;
812 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
813 struct PeerRecord *pr;
814 struct GNUNET_CORE_TransmitHandle *th;
822 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
824 ("Client was disconnected from core service, trying to reconnect.\n"));
828 msize = ntohs (msg->size);
830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
831 "Processing message of type %u and size %u from core service\n",
832 ntohs (msg->type), msize);
834 switch (ntohs (msg->type))
836 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
837 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
843 m = (const struct InitReplyMessage *) msg;
844 GNUNET_break (0 == ntohl (m->reserved));
845 /* start our message processing loop */
846 if (GNUNET_YES == h->currently_down)
848 h->currently_down = GNUNET_NO;
849 trigger_next_request (h, GNUNET_NO);
851 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
852 if (NULL != (init = h->init))
854 /* mark so we don't call init on reconnect */
856 GNUNET_CRYPTO_hash (&m->publicKey,
858 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
862 "Connected to core service of peer `%s'.\n",
863 GNUNET_i2s (&h->me));
865 init (h->cls, h, &h->me, &m->publicKey);
870 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
871 "Successfully reconnected to core service.\n");
875 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
876 if (msize != sizeof (struct ConnectNotifyMessage))
882 cnm = (const struct ConnectNotifyMessage *) msg;
884 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
885 "Received notification about connection from `%s'.\n",
886 GNUNET_i2s (&cnm->peer));
888 if (0 == memcmp (&h->me,
890 sizeof (struct GNUNET_PeerIdentity)))
892 /* disconnect from self!? */
896 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
897 &cnm->peer.hashPubKey);
904 pr = GNUNET_malloc (sizeof (struct PeerRecord));
905 pr->peer = cnm->peer;
907 GNUNET_assert (GNUNET_YES ==
908 GNUNET_CONTAINER_multihashmap_put (h->peers,
909 &cnm->peer.hashPubKey,
911 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
912 if (NULL != h->connects)
915 NULL /* FIXME: atsi! */);
917 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
918 if (msize != sizeof (struct DisconnectNotifyMessage))
924 dnm = (const struct DisconnectNotifyMessage *) msg;
925 if (0 == memcmp (&h->me,
927 sizeof (struct GNUNET_PeerIdentity)))
929 /* connection to self!? */
934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
935 "Received notification about disconnect from `%s'.\n",
936 GNUNET_i2s (&dnm->peer));
938 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
939 &dnm->peer.hashPubKey);
946 trigger = ( (pr->prev != NULL) ||
947 (pr->next != NULL) ||
948 (h->ready_peer_head == pr) );
949 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
951 trigger_next_request (h, GNUNET_NO);
953 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
954 if (NULL == h->status_events)
959 if (msize != sizeof (struct PeerStatusNotifyMessage))
965 psnm = (const struct PeerStatusNotifyMessage *) msg;
966 if (0 == memcmp (&h->me,
968 sizeof (struct GNUNET_PeerIdentity)))
975 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
976 "Received notification about status change by `%s'.\n",
977 GNUNET_i2s (&psnm->peer));
979 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
980 &psnm->peer.hashPubKey);
987 h->status_events (h->cls,
991 GNUNET_TIME_absolute_ntoh (psnm->timeout),
992 NULL /* FIXME: atsi */);
994 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
996 sizeof (struct NotifyTrafficMessage) +
997 sizeof (struct GNUNET_MessageHeader))
1000 reconnect_later (h);
1003 ntm = (const struct NotifyTrafficMessage *) msg;
1004 if (0 == memcmp (&h->me,
1006 sizeof (struct GNUNET_PeerIdentity)))
1012 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1015 "Received message of type %u and size %u from peer `%4s'\n",
1018 GNUNET_i2s (&ntm->peer));
1020 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1021 &ntm->peer.hashPubKey);
1025 reconnect_later (h);
1028 if ((GNUNET_NO == h->inbound_hdr_only) &&
1029 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1032 reconnect_later (h);
1035 et = ntohs (em->type);
1036 for (hpos = 0; hpos < h->hcnt; hpos++)
1038 mh = &h->handlers[hpos];
1041 if ((mh->expected_size != ntohs (em->size)) &&
1042 (mh->expected_size != 0))
1048 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1049 NULL /* FIXME: atsi */))
1051 /* error in processing, do not process other messages! */
1055 if (NULL != h->inbound_notify)
1056 h->inbound_notify (h->cls, &ntm->peer, em,
1057 NULL /* FIXME: atsi */);
1059 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1061 sizeof (struct NotifyTrafficMessage) +
1062 sizeof (struct GNUNET_MessageHeader))
1065 reconnect_later (h);
1068 ntm = (const struct NotifyTrafficMessage *) msg;
1069 if (0 == memcmp (&h->me,
1071 sizeof (struct GNUNET_PeerIdentity)))
1077 em = (const struct GNUNET_MessageHeader *) &ntm[1];
1078 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1079 &ntm->peer.hashPubKey);
1083 reconnect_later (h);
1087 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1088 "Received notification about transmission to `%s'.\n",
1089 GNUNET_i2s (&ntm->peer));
1091 if ((GNUNET_NO == h->outbound_hdr_only) &&
1092 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)))
1095 reconnect_later (h);
1098 if (NULL == h->outbound_notify)
1103 h->outbound_notify (h->cls, &ntm->peer, em,
1104 NULL /* FIXME: atsi? */);
1106 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1107 if (msize != sizeof (struct SendMessageReady))
1110 reconnect_later (h);
1113 smr = (const struct SendMessageReady *) msg;
1114 if (0 == memcmp (&h->me,
1116 sizeof (struct GNUNET_PeerIdentity)))
1122 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1123 &smr->peer.hashPubKey);
1127 reconnect_later (h);
1131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1132 "Received notification about transmission readiness to `%s'.\n",
1133 GNUNET_i2s (&smr->peer));
1135 if (pr->pending_head == NULL)
1137 /* request must have been cancelled between the original request
1138 and the response from core, ignore core's readiness */
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 canceled.
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 if (cm->cont != NULL)
1419 cm->cont (cm->cont_cls, NULL);
1422 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1423 &disconnect_and_free_peer_entry,
1425 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1426 GNUNET_break (handle->ready_peer_head == NULL);
1427 GNUNET_free (handle);
1432 * Ask the core to call "notify" once it is ready to transmit the
1433 * given number of bytes to the specified "target". If we are not yet
1434 * connected to the specified peer, a call to this function will cause
1435 * us to try to establish a connection.
1437 * @param handle connection to core service
1438 * @param priority how important is the message?
1439 * @param maxdelay how long can the message wait?
1440 * @param target who should receive the message,
1441 * use NULL for this peer (loopback)
1442 * @param notify_size how many bytes of buffer space does notify want?
1443 * @param notify function to call when buffer space is available
1444 * @param notify_cls closure for notify
1445 * @return non-NULL if the notify callback was queued,
1446 * NULL if we can not even queue the request (insufficient
1447 * memory); if NULL is returned, "notify" will NOT be called.
1449 struct GNUNET_CORE_TransmitHandle *
1450 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1452 struct GNUNET_TIME_Relative maxdelay,
1453 const struct GNUNET_PeerIdentity *target,
1455 GNUNET_CONNECTION_TransmitReadyNotify notify,
1458 struct PeerRecord *pr;
1459 struct GNUNET_CORE_TransmitHandle *th;
1460 struct GNUNET_CORE_TransmitHandle *pos;
1461 struct GNUNET_CORE_TransmitHandle *prev;
1462 struct GNUNET_CORE_TransmitHandle *minp;
1464 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1465 &target->hashPubKey);
1468 /* attempt to send to peer that is not connected */
1469 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1470 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1471 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1475 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1476 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1477 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1479 th->get_message = notify;
1480 th->get_message_cls = notify_cls;
1481 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1482 th->priority = priority;
1483 th->msize = notify_size;
1484 /* bound queue size */
1485 if (pr->queue_size == handle->queue_size)
1487 /* find lowest-priority entry */
1488 minp = pr->pending_head;
1490 while (prev != NULL)
1492 if (prev->priority < minp->priority)
1498 GNUNET_break (handle->queue_size != 0);
1499 GNUNET_break (pr->queue_size == 0);
1502 if (priority <= minp->priority)
1505 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1506 "Dropping transmission request: priority too low\n");
1508 return NULL; /* priority too low */
1510 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1515 minp->get_message (minp->get_message_cls,
1520 /* Order entries by deadline, but SKIP 'HEAD' if
1521 we're in the 'ready_peer_*' DLL */
1522 pos = pr->pending_head;
1523 if ( (pr->prev != NULL) ||
1524 (pr->next != NULL) ||
1525 (pr == handle->ready_peer_head) )
1527 GNUNET_assert (pos != NULL);
1528 pos = pos->next; /* skip head */
1531 /* insertion sort */
1533 while ( (pos != NULL) &&
1534 (pos->timeout.abs_value < th->timeout.abs_value) )
1539 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1544 /* was the request queue previously empty? */
1546 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1547 "Transmission request added to queue\n");
1549 if (pr->pending_head == th)
1550 request_next_transmission (pr);
1556 * Cancel the specified transmission-ready notification.
1558 * @param th handle that was returned by "notify_transmit_ready".
1561 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1564 struct PeerRecord *pr = th->peer;
1565 struct GNUNET_CORE_Handle *h = pr->ch;
1568 was_head = (pr->pending_head == th);
1569 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1575 /* we're currently in the control queue, remove */
1576 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1579 GNUNET_free (th->cm);
1584 if ( (pr->prev != NULL) ||
1585 (pr->next != NULL) ||
1586 (pr == h->ready_peer_head) )
1588 /* the request that was 'approved' by core was
1589 canceled before it could be transmitted; remove
1590 us from the 'ready' list */
1591 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1595 request_next_transmission (pr);
1600 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1603 * Handle for a request to the core to connect to
1604 * a particular peer. Can be used to cancel the request
1605 * (before the 'cont'inuation is called).
1607 struct GNUNET_CORE_PeerRequestHandle
1611 * Link to control message.
1613 struct ControlMessage *cm;
1618 struct GNUNET_CORE_Handle *h;
1621 * Continuation to run when done.
1623 GNUNET_SCHEDULER_Task cont;
1626 * Closure for 'cont'.
1634 * Continuation called when the control message was transmitted.
1635 * Calls the original continuation and frees the remaining
1638 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1639 * @param tc scheduler context
1642 peer_request_connect_cont (void *cls,
1643 const struct GNUNET_SCHEDULER_TaskContext *tc)
1645 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1647 if (ret->cont != NULL)
1650 GNUNET_SCHEDULER_add_now (ret->cont,
1653 ret->cont (ret->cont_cls, tc);
1660 * Request that the core should try to connect to a particular peer.
1661 * Once the request has been transmitted to the core, the continuation
1662 * function will be called. Note that this does NOT mean that a
1663 * connection was successfully established -- it only means that the
1664 * core will now try. Successful establishment of the connection
1665 * will be signalled to the 'connects' callback argument of
1666 * 'GNUNET_CORE_connect' only. If the core service does not respond
1667 * to our connection attempt within the given time frame, 'cont' will
1668 * be called with the TIMEOUT reason code.
1670 * @param h core handle
1671 * @param timeout how long to try to talk to core
1672 * @param peer who should we connect to
1673 * @param cont function to call once the request has been completed (or timed out)
1674 * @param cont_cls closure for cont
1675 * @return NULL on error (cont will not be called), otherwise handle for cancellation
1677 struct GNUNET_CORE_PeerRequestHandle *
1678 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1679 struct GNUNET_TIME_Relative timeout,
1680 const struct GNUNET_PeerIdentity * peer,
1681 GNUNET_SCHEDULER_Task cont,
1684 struct GNUNET_CORE_PeerRequestHandle *ret;
1685 struct ControlMessage *cm;
1686 struct ConnectMessage *msg;
1688 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1689 sizeof (struct ConnectMessage));
1690 msg = (struct ConnectMessage*) &cm[1];
1691 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1692 msg->header.size = htons (sizeof (struct ConnectMessage));
1693 msg->reserved = htonl (0);
1694 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1696 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1699 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1703 ret->cont_cls = cont_cls;
1704 cm->cont = &peer_request_connect_cont;
1707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1708 "Queueing REQUEST_CONNECT request\n");
1710 if (h->pending_head == cm)
1711 trigger_next_request (h, GNUNET_NO);
1717 * Cancel a pending request to connect to a particular peer. Must not
1718 * be called after the 'cont' function was invoked.
1720 * @param req request handle that was returned for the original request
1723 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1725 struct GNUNET_CORE_Handle *h = req->h;
1726 struct ControlMessage *cm = req->cm;
1728 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1736 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1739 struct GNUNET_CORE_InformationRequestContext
1743 * Our connection to the service.
1745 struct GNUNET_CORE_Handle *h;
1748 * Function to call with the information.
1750 GNUNET_CORE_PeerConfigurationInfoCallback info;
1758 * Link to control message, NULL if CM was sent.
1760 struct ControlMessage *cm;
1763 * Link to peer record.
1765 struct PeerRecord *pr;
1770 * CM was sent, remove link so we don't double-free.
1772 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1773 * @param tc scheduler context
1776 change_preference_send_continuation (void *cls,
1777 const struct GNUNET_SCHEDULER_TaskContext *tc)
1779 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1786 * Obtain statistics and/or change preferences for the given peer.
1788 * @param h core handle
1789 * @param peer identifies the peer
1790 * @param timeout after how long should we give up (and call "info" with NULL
1791 * for "peer" to signal an error)?
1792 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1793 * caller should set "bw_out" to "-1" to avoid changing
1794 * the current value; otherwise "bw_out" will be lowered to
1795 * the specified value; passing a pointer to "0" can be used to force
1796 * us to disconnect from the peer; "bw_out" might not increase
1797 * as specified since the upper bound is generally
1798 * determined by the other peer!
1799 * @param amount reserve N bytes for receiving, negative
1800 * amounts can be used to undo a (recent) reservation;
1801 * @param preference increase incoming traffic share preference by this amount;
1802 * in the absence of "amount" reservations, we use this
1803 * preference value to assign proportional bandwidth shares
1804 * to all connected peers
1805 * @param info function to call with the resulting configuration information
1806 * @param info_cls closure for info
1807 * @return NULL on error
1809 struct GNUNET_CORE_InformationRequestContext *
1810 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1811 const struct GNUNET_PeerIdentity *peer,
1812 struct GNUNET_TIME_Relative timeout,
1813 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1815 uint64_t preference,
1816 GNUNET_CORE_PeerConfigurationInfoCallback info,
1819 struct GNUNET_CORE_InformationRequestContext *irc;
1820 struct PeerRecord *pr;
1821 struct RequestInfoMessage *rim;
1822 struct ControlMessage *cm;
1824 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1828 /* attempt to change preference on peer that is not connected */
1832 if (pr->pcic != NULL)
1834 /* second change before first one is done */
1838 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1842 irc->info_cls = info_cls;
1843 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1844 sizeof (struct RequestInfoMessage));
1845 cm->cont = &change_preference_send_continuation;
1848 rim = (struct RequestInfoMessage*) &cm[1];
1849 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1850 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1851 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1852 rim->limit_outbound = bw_out;
1853 rim->reserve_inbound = htonl (amount);
1854 rim->preference_change = GNUNET_htonll(preference);
1857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1858 "Queueing CHANGE PREFERENCE request\n");
1860 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1864 pr->pcic_cls = info_cls;
1865 if (h->pending_head == cm)
1866 trigger_next_request (h, GNUNET_NO);
1872 * Cancel request for getting information about a peer.
1873 * Note that an eventual change in preference, trust or bandwidth
1874 * assignment MAY have already been committed at the time,
1875 * so cancelling a request is NOT sure to undo the original
1876 * request. The original request may or may not still commit.
1877 * The only thing cancellation ensures is that the callback
1878 * from the original request will no longer be called.
1880 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1883 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1885 struct GNUNET_CORE_Handle *h = irc->h;
1886 struct PeerRecord *pr = irc->pr;
1888 if (irc->cm != NULL)
1890 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1893 GNUNET_free (irc->cm);
1896 pr->pcic_cls = NULL;
1901 /* end of core_api.c */