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 #include "gnunet_constants.h"
29 #include "gnunet_core_service.h"
34 * Information we track for each peer.
40 * We generally do NOT keep peer records in a DLL; this
41 * DLL is only used IF this peer's 'pending_head' message
42 * is ready for transmission.
44 struct PeerRecord *prev;
47 * We generally do NOT keep peer records in a DLL; this
48 * DLL is only used IF this peer's 'pending_head' message
49 * is ready for transmission.
51 struct PeerRecord *next;
54 * Peer the record is about.
56 struct GNUNET_PeerIdentity peer;
59 * Corresponding core handle.
61 struct GNUNET_CORE_Handle *ch;
64 * Head of doubly-linked list of pending requests.
65 * Requests are sorted by deadline *except* for HEAD,
66 * which is only modified upon transmission to core.
68 struct GNUNET_CORE_TransmitHandle *pending_head;
71 * Tail of doubly-linked list of pending requests.
73 struct GNUNET_CORE_TransmitHandle *pending_tail;
76 * Pending callback waiting for peer information, or NULL for none.
78 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
86 * Request information ID for the given pcic (needed in case a
87 * request is cancelled after being submitted to core and a new
88 * one is generated; in this case, we need to avoid matching the
89 * reply to the first (cancelled) request to the second request).
94 * ID of timeout task for the 'pending_head' handle
95 * which is the one with the smallest timeout.
97 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
100 * Current size of the queue of pending requests.
102 unsigned int queue_size;
105 * SendMessageRequest ID generator for this peer.
113 * Entry in a doubly-linked list of control messages to be transmitted
114 * to the core service. Control messages include traffic allocation,
115 * connection requests and of course our initial 'init' request.
117 * The actual message is allocated at the end of this struct.
119 struct ControlMessage
122 * This is a doubly-linked list.
124 struct ControlMessage *next;
127 * This is a doubly-linked list.
129 struct ControlMessage *prev;
132 * Function to run after successful transmission (or call with
133 * reason 'TIMEOUT' on error); called with scheduler context 'NULL'
136 GNUNET_SCHEDULER_Task cont;
139 * Closure for 'cont'.
144 * Transmit handle (if one is associated with this ControlMessage), or NULL.
146 struct GNUNET_CORE_TransmitHandle *th;
152 * Context for the core service connection.
154 struct GNUNET_CORE_Handle
158 * Configuration we're using.
160 const struct GNUNET_CONFIGURATION_Handle *cfg;
163 * Closure for the various callbacks.
168 * Function to call once we've handshaked with the core service.
170 GNUNET_CORE_StartupCallback init;
173 * Function to call whenever we're notified about a peer connecting.
175 GNUNET_CORE_ConnectEventHandler connects;
178 * Function to call whenever we're notified about a peer disconnecting.
180 GNUNET_CORE_DisconnectEventHandler disconnects;
183 * Function to call whenever we're notified about a peer changing status.
185 GNUNET_CORE_PeerStatusEventHandler status_events;
188 * Function to call whenever we receive an inbound message.
190 GNUNET_CORE_MessageCallback inbound_notify;
193 * Function to call whenever we receive an outbound message.
195 GNUNET_CORE_MessageCallback outbound_notify;
198 * Function handlers for messages of particular type.
200 const struct GNUNET_CORE_MessageHandler *handlers;
203 * Our connection to the service.
205 struct GNUNET_CLIENT_Connection *client;
208 * Handle for our current transmission request.
210 struct GNUNET_CLIENT_TransmitHandle *cth;
213 * Head of doubly-linked list of pending requests.
215 struct ControlMessage *pending_head;
218 * Tail of doubly-linked list of pending requests.
220 struct ControlMessage *pending_tail;
223 * Head of doubly-linked list of peers that are core-approved
224 * to send their next message.
226 struct PeerRecord *ready_peer_head;
229 * Tail of doubly-linked list of peers that are core-approved
230 * to send their next message.
232 struct PeerRecord *ready_peer_tail;
235 * Hash map listing all of the peers that we are currently
238 struct GNUNET_CONTAINER_MultiHashMap *peers;
241 * Identity of this peer.
243 struct GNUNET_PeerIdentity me;
246 * ID of reconnect task (if any).
248 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
251 * Current delay we use for re-trying to connect to core.
253 struct GNUNET_TIME_Relative retry_backoff;
256 * Request information ID generator.
261 * Number of messages we are allowed to queue per target.
263 unsigned int queue_size;
266 * Number of entries in the handlers array.
271 * For inbound notifications without a specific handler, do
272 * we expect to only receive headers?
274 int inbound_hdr_only;
277 * For outbound notifications without a specific handler, do
278 * we expect to only receive headers?
280 int outbound_hdr_only;
283 * Are we currently disconnected and hence unable to forward
292 * Handle for a transmission request.
294 struct GNUNET_CORE_TransmitHandle
298 * We keep active transmit handles in a doubly-linked list.
300 struct GNUNET_CORE_TransmitHandle *next;
303 * We keep active transmit handles in a doubly-linked list.
305 struct GNUNET_CORE_TransmitHandle *prev;
308 * Corresponding peer record.
310 struct PeerRecord *peer;
313 * Corresponding SEND_REQUEST message. Only non-NULL
314 * while SEND_REQUEST message is pending.
316 struct ControlMessage *cm;
319 * Function that will be called to get the actual request
320 * (once we are ready to transmit this request to the core).
321 * The function will be called with a NULL buffer to signal
324 GNUNET_CONNECTION_TransmitReadyNotify get_message;
327 * Closure for get_message.
329 void *get_message_cls;
332 * Timeout for this handle.
334 struct GNUNET_TIME_Absolute timeout;
337 * How important is this message?
342 * Size of this request.
347 * Send message request ID for this request.
355 * Our current client connection went down. Clean it up
356 * and try to reconnect!
358 * @param h our handle to the core service
361 reconnect (struct GNUNET_CORE_Handle *h);
365 * Task schedule to try to re-connect to core.
367 * @param cls the 'struct GNUNET_CORE_Handle'
368 * @param tc task context
371 reconnect_task (void *cls,
372 const struct GNUNET_SCHEDULER_TaskContext *tc)
374 struct GNUNET_CORE_Handle *h = cls;
376 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
378 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
379 "Connecting to CORE service after delay\n");
386 * Notify clients about disconnect and free
387 * the entry for connected peer.
389 * @param cls the 'struct GNUNET_CORE_Handle*'
390 * @param key the peer identity (not used)
391 * @param value the 'struct PeerRecord' to free.
392 * @return GNUNET_YES (continue)
395 disconnect_and_free_peer_entry (void *cls,
396 const GNUNET_HashCode *key,
399 static struct GNUNET_BANDWIDTH_Value32NBO zero;
400 struct GNUNET_CORE_Handle *h = cls;
401 struct GNUNET_CORE_TransmitHandle *th;
402 struct PeerRecord *pr = value;
403 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
405 while (NULL != (th = pr->pending_head))
407 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
412 th->get_message (th->get_message_cls,
416 if (NULL != (pcic = pr->pcic))
424 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
426 GNUNET_SCHEDULER_cancel (pr->timeout_task);
427 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
429 GNUNET_assert (pr->queue_size == 0);
430 if ( (pr->prev != NULL) ||
431 (pr->next != NULL) ||
432 (h->ready_peer_head == pr) )
433 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
436 if (h->disconnects != NULL)
437 h->disconnects (h->cls,
439 GNUNET_assert (GNUNET_YES ==
440 GNUNET_CONTAINER_multihashmap_remove (h->peers,
443 GNUNET_assert (pr->pending_head == NULL);
444 GNUNET_assert (pr->pending_tail == NULL);
445 GNUNET_assert (pr->ch = h);
446 GNUNET_assert (pr->queue_size == 0);
447 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
454 * Close down any existing connection to the CORE service and
455 * try re-establishing it later.
457 * @param h our handle
460 reconnect_later (struct GNUNET_CORE_Handle *h)
462 struct ControlMessage *cm;
463 struct PeerRecord *pr;
465 while (NULL != (cm = h->pending_head))
467 GNUNET_CONTAINER_DLL_remove (h->pending_head,
472 if (cm->cont != NULL)
473 cm->cont (cm->cont_cls, NULL);
476 if (h->client != NULL)
478 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
481 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
482 &disconnect_and_free_peer_entry,
485 while (NULL != (pr = h->ready_peer_head))
486 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
490 GNUNET_assert (h->pending_head == NULL);
491 h->currently_down = GNUNET_YES;
492 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
493 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
495 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
498 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
503 * Check the list of pending requests, send the next
506 * @param h core handle
507 * @param ignore_currently_down transmit message even if not initialized?
510 trigger_next_request (struct GNUNET_CORE_Handle *h,
511 int ignore_currently_down);
515 * The given request hit its timeout. Remove from the
516 * doubly-linked list and call the respective continuation.
518 * @param cls the transmit handle of the request that timed out
519 * @param tc context, can be NULL (!)
522 transmission_timeout (void *cls,
523 const struct GNUNET_SCHEDULER_TaskContext *tc);
527 * Send a control message to the peer asking for transmission
528 * of the message in the given peer record.
530 * @param pr peer to request transmission to
533 request_next_transmission (struct PeerRecord *pr)
535 struct GNUNET_CORE_Handle *h = pr->ch;
536 struct ControlMessage *cm;
537 struct SendMessageRequest *smr;
538 struct GNUNET_CORE_TransmitHandle *th;
540 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
542 GNUNET_SCHEDULER_cancel (pr->timeout_task);
543 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
545 if (NULL == (th = pr->pending_head))
547 trigger_next_request (h, GNUNET_NO);
550 GNUNET_assert (pr->prev == NULL);
551 GNUNET_assert (pr->next == NULL);
552 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
553 &transmission_timeout,
555 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
556 sizeof (struct SendMessageRequest));
559 smr = (struct SendMessageRequest*) &cm[1];
560 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
561 smr->header.size = htons (sizeof (struct SendMessageRequest));
562 smr->priority = htonl (th->priority);
563 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
564 smr->peer = pr->peer;
565 smr->queue_size = htonl (pr->queue_size);
566 smr->size = htons (th->msize);
567 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
568 GNUNET_CONTAINER_DLL_insert_after (h->pending_head,
573 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
574 "Adding SEND REQUEST for peer `%s' to message queue\n",
575 GNUNET_i2s (&pr->peer));
577 trigger_next_request (h, GNUNET_NO);
582 * The given request hit its timeout. Remove from the
583 * doubly-linked list and call the respective continuation.
585 * @param cls the transmit handle of the request that timed out
586 * @param tc context, can be NULL (!)
589 transmission_timeout (void *cls,
590 const struct GNUNET_SCHEDULER_TaskContext *tc)
592 struct PeerRecord *pr = cls;
593 struct GNUNET_CORE_TransmitHandle *th;
595 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
596 th = pr->pending_head;
597 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
602 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
603 "Signalling timeout of request for transmission to CORE service\n");
605 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
606 request_next_transmission (pr);
611 * Transmit the next message to the core service.
614 transmit_message (void *cls,
618 struct GNUNET_CORE_Handle *h = cls;
619 struct ControlMessage *cm;
620 struct GNUNET_CORE_TransmitHandle *th;
621 struct PeerRecord *pr;
622 struct SendMessage *sm;
623 const struct GNUNET_MessageHeader *hdr;
631 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
632 "Transmission failed, initiating reconnect\n");
637 /* first check for control messages */
638 if (NULL != (cm = h->pending_head))
640 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
641 msize = ntohs (hdr->size);
644 trigger_next_request (h, GNUNET_NO);
648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
649 "Transmitting control message with %u bytes of type %u to core.\n",
650 (unsigned int) msize,
651 (unsigned int) ntohs (hdr->type));
653 memcpy (buf, hdr, msize);
654 GNUNET_CONTAINER_DLL_remove (h->pending_head,
659 if (NULL != cm->cont)
660 GNUNET_SCHEDULER_add_continuation (cm->cont,
662 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
664 trigger_next_request (h, GNUNET_NO);
667 /* now check for 'ready' P2P messages */
668 if (NULL != (pr = h->ready_peer_head))
670 GNUNET_assert (pr->pending_head != NULL);
671 th = pr->pending_head;
672 if (size < th->msize + sizeof (struct SendMessage))
674 trigger_next_request (h, GNUNET_NO);
677 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
680 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
684 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
686 GNUNET_SCHEDULER_cancel (pr->timeout_task);
687 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
691 "Transmitting SEND request to `%s' with %u bytes.\n",
692 GNUNET_i2s (&pr->peer),
693 (unsigned int) th->msize);
695 sm = (struct SendMessage *) buf;
696 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
697 sm->priority = htonl (th->priority);
698 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
700 ret = th->get_message (th->get_message_cls,
701 size - sizeof (struct SendMessage),
707 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
708 "Size of clients message to peer %s is 0!\n",
709 GNUNET_i2s(&pr->peer));
711 /* client decided to send nothing! */
712 request_next_transmission (pr);
716 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
717 "Produced SEND message to core with %u bytes payload\n",
720 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
721 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
724 request_next_transmission (pr);
727 ret += sizeof (struct SendMessage);
728 sm->header.size = htons (ret);
729 GNUNET_assert (ret <= size);
731 request_next_transmission (pr);
739 * Check the list of pending requests, send the next
742 * @param h core handle
743 * @param ignore_currently_down transmit message even if not initialized?
746 trigger_next_request (struct GNUNET_CORE_Handle *h,
747 int ignore_currently_down)
751 if ( (GNUNET_YES == h->currently_down) &&
752 (ignore_currently_down == GNUNET_NO) )
755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
756 "Core connection down, not processing queue\n");
763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
764 "Request pending, not processing queue\n");
768 if (h->pending_head != NULL)
769 msize = ntohs (((struct GNUNET_MessageHeader*) &h->pending_head[1])->size);
770 else if (h->ready_peer_head != NULL)
771 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
775 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
776 "Request queue empty, not processing queue\n");
778 return; /* no pending message */
780 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
782 GNUNET_TIME_UNIT_FOREVER_REL,
784 &transmit_message, h);
789 * Handler for notification messages received from the core.
791 * @param cls our "struct GNUNET_CORE_Handle"
792 * @param msg the message received from the core service
795 main_notify_handler (void *cls,
796 const struct GNUNET_MessageHeader *msg)
798 struct GNUNET_CORE_Handle *h = cls;
799 const struct InitReplyMessage *m;
800 const struct ConnectNotifyMessage *cnm;
801 const struct DisconnectNotifyMessage *dnm;
802 const struct NotifyTrafficMessage *ntm;
803 const struct GNUNET_MessageHeader *em;
804 const struct ConfigurationInfoMessage *cim;
805 const struct PeerStatusNotifyMessage *psnm;
806 const struct SendMessageReady *smr;
807 const struct GNUNET_CORE_MessageHandler *mh;
808 GNUNET_CORE_StartupCallback init;
809 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
810 struct PeerRecord *pr;
811 struct GNUNET_CORE_TransmitHandle *th;
820 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
822 ("Client was disconnected from core service, trying to reconnect.\n"));
826 msize = ntohs (msg->size);
828 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
829 "Processing message of type %u and size %u from core service\n",
830 ntohs (msg->type), msize);
832 switch (ntohs (msg->type))
834 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
835 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
841 m = (const struct InitReplyMessage *) msg;
842 GNUNET_break (0 == ntohl (m->reserved));
843 /* start our message processing loop */
844 if (GNUNET_YES == h->currently_down)
846 h->currently_down = GNUNET_NO;
847 trigger_next_request (h, GNUNET_NO);
849 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
850 if (NULL != (init = h->init))
852 /* mark so we don't call init on reconnect */
854 GNUNET_CRYPTO_hash (&m->publicKey,
856 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
859 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
860 "Connected to core service of peer `%s'.\n",
861 GNUNET_i2s (&h->me));
863 init (h->cls, h, &h->me, &m->publicKey);
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Successfully reconnected to core service.\n");
873 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
874 if (msize < sizeof (struct ConnectNotifyMessage))
880 cnm = (const struct ConnectNotifyMessage *) msg;
881 ats_count = ntohl (cnm->ats_count);
882 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
883 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
890 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
891 "Received notification about connection from `%s'.\n",
892 GNUNET_i2s (&cnm->peer));
894 if (0 == memcmp (&h->me,
896 sizeof (struct GNUNET_PeerIdentity)))
898 /* disconnect from self!? */
902 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
903 &cnm->peer.hashPubKey);
910 pr = GNUNET_malloc (sizeof (struct PeerRecord));
911 pr->peer = cnm->peer;
913 GNUNET_assert (GNUNET_YES ==
914 GNUNET_CONTAINER_multihashmap_put (h->peers,
915 &cnm->peer.hashPubKey,
917 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
918 if (NULL != h->connects)
923 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
924 if (msize != sizeof (struct DisconnectNotifyMessage))
930 dnm = (const struct DisconnectNotifyMessage *) msg;
931 if (0 == memcmp (&h->me,
933 sizeof (struct GNUNET_PeerIdentity)))
935 /* connection to self!? */
940 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
941 "Received notification about disconnect from `%s'.\n",
942 GNUNET_i2s (&dnm->peer));
944 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
945 &dnm->peer.hashPubKey);
952 trigger = ( (pr->prev != NULL) ||
953 (pr->next != NULL) ||
954 (h->ready_peer_head == pr) );
955 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
957 trigger_next_request (h, GNUNET_NO);
959 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
960 if (NULL == h->status_events)
965 if (msize < sizeof (struct PeerStatusNotifyMessage))
971 psnm = (const struct PeerStatusNotifyMessage *) msg;
972 if (0 == memcmp (&h->me,
974 sizeof (struct GNUNET_PeerIdentity)))
980 ats_count = ntohl (psnm->ats_count);
981 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
982 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
990 "Received notification about status change by `%s'.\n",
991 GNUNET_i2s (&psnm->peer));
993 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
994 &psnm->peer.hashPubKey);
1001 h->status_events (h->cls,
1004 psnm->bandwidth_out,
1005 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1008 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1009 if (msize < sizeof (struct NotifyTrafficMessage))
1012 reconnect_later (h);
1015 ntm = (const struct NotifyTrafficMessage *) msg;
1016 if (0 == memcmp (&h->me,
1018 sizeof (struct GNUNET_PeerIdentity)))
1024 ats_count = ntohl (ntm->ats_count);
1025 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1026 + sizeof (struct GNUNET_MessageHeader)) ||
1027 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1030 reconnect_later (h);
1033 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1035 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1036 "Received message of type %u and size %u from peer `%4s'\n",
1039 GNUNET_i2s (&ntm->peer));
1041 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1042 &ntm->peer.hashPubKey);
1046 reconnect_later (h);
1049 if ((GNUNET_NO == h->inbound_hdr_only) &&
1050 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1051 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1054 reconnect_later (h);
1057 et = ntohs (em->type);
1058 for (hpos = 0; hpos < h->hcnt; hpos++)
1060 mh = &h->handlers[hpos];
1063 if ((mh->expected_size != ntohs (em->size)) &&
1064 (mh->expected_size != 0))
1070 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1073 /* error in processing, do not process other messages! */
1077 if (NULL != h->inbound_notify)
1078 h->inbound_notify (h->cls, &ntm->peer, em,
1081 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1082 if (msize < sizeof (struct NotifyTrafficMessage))
1085 reconnect_later (h);
1088 ntm = (const struct NotifyTrafficMessage *) msg;
1089 if (0 == memcmp (&h->me,
1091 sizeof (struct GNUNET_PeerIdentity)))
1097 ats_count = ntohl (ntm->ats_count);
1098 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1099 + sizeof (struct GNUNET_MessageHeader)) ||
1100 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1103 reconnect_later (h);
1106 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1107 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1108 &ntm->peer.hashPubKey);
1112 reconnect_later (h);
1116 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1117 "Received notification about transmission to `%s'.\n",
1118 GNUNET_i2s (&ntm->peer));
1120 if ((GNUNET_NO == h->outbound_hdr_only) &&
1121 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1122 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1125 reconnect_later (h);
1128 if (NULL == h->outbound_notify)
1133 h->outbound_notify (h->cls, &ntm->peer, em,
1136 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1137 if (msize != sizeof (struct SendMessageReady))
1140 reconnect_later (h);
1143 smr = (const struct SendMessageReady *) msg;
1144 if (0 == memcmp (&h->me,
1146 sizeof (struct GNUNET_PeerIdentity)))
1152 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1153 &smr->peer.hashPubKey);
1157 reconnect_later (h);
1161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1162 "Received notification about transmission readiness to `%s'.\n",
1163 GNUNET_i2s (&smr->peer));
1165 if (pr->pending_head == NULL)
1167 /* request must have been cancelled between the original request
1168 and the response from core, ignore core's readiness */
1172 th = pr->pending_head;
1173 if (ntohs (smr->smr_id) != th->smr_id)
1175 /* READY message is for expired or cancelled message,
1176 ignore! (we should have already sent another request) */
1179 if ( (pr->prev != NULL) ||
1180 (pr->next != NULL) ||
1181 (h->ready_peer_head == pr) )
1183 /* we should not already be on the ready list... */
1185 reconnect_later (h);
1188 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1191 trigger_next_request (h, GNUNET_NO);
1193 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1194 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1197 reconnect_later (h);
1200 cim = (const struct ConfigurationInfoMessage*) msg;
1201 if (0 == memcmp (&h->me,
1203 sizeof (struct GNUNET_PeerIdentity)))
1210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1211 "Received notification about configuration update for `%s'.\n",
1212 GNUNET_i2s (&cim->peer));
1214 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1215 &cim->peer.hashPubKey);
1219 reconnect_later (h);
1222 if (pr->rim_id != ntohl (cim->rim_id))
1230 ntohl (cim->reserved_amount),
1231 GNUNET_ntohll (cim->preference));
1234 reconnect_later (h);
1237 GNUNET_CLIENT_receive (h->client,
1238 &main_notify_handler, h,
1239 GNUNET_TIME_UNIT_FOREVER_REL);
1244 * Task executed once we are done transmitting the INIT message.
1245 * Starts our 'receive' loop.
1247 * @param cls the 'struct GNUNET_CORE_Handle'
1248 * @param tc task context
1251 init_done_task (void *cls,
1252 const struct GNUNET_SCHEDULER_TaskContext *tc)
1254 struct GNUNET_CORE_Handle *h = cls;
1258 if (0 == (tc->reason & GNUNET_SCHEDULER_REASON_PREREQ_DONE))
1261 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1262 "Failed to exchange INIT with core, retrying\n");
1264 reconnect_later (h);
1267 GNUNET_CLIENT_receive (h->client,
1268 &main_notify_handler,
1270 GNUNET_TIME_UNIT_FOREVER_REL);
1275 * Our current client connection went down. Clean it up
1276 * and try to reconnect!
1278 * @param h our handle to the core service
1281 reconnect (struct GNUNET_CORE_Handle *h)
1283 struct ControlMessage *cm;
1284 struct InitMessage *init;
1291 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1292 "Reconnecting to CORE service\n");
1294 GNUNET_assert (h->client == NULL);
1295 GNUNET_assert (h->currently_down == GNUNET_YES);
1296 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1297 if (h->client == NULL)
1299 reconnect_later (h);
1302 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1303 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1305 cm->cont = &init_done_task;
1307 init = (struct InitMessage*) &cm[1];
1308 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1309 init->header.size = htons (msize);
1310 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1311 if (h->status_events != NULL)
1312 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1313 if (h->inbound_notify != NULL)
1315 if (h->inbound_hdr_only)
1316 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1318 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1320 if (h->outbound_notify != NULL)
1322 if (h->outbound_hdr_only)
1323 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1325 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1327 init->options = htonl (opt);
1328 ts = (uint16_t *) &init[1];
1329 for (hpos = 0; hpos < h->hcnt; hpos++)
1330 ts[hpos] = htons (h->handlers[hpos].type);
1331 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1334 trigger_next_request (h, GNUNET_YES);
1340 * Connect to the core service. Note that the connection may
1341 * complete (or fail) asynchronously.
1343 * @param cfg configuration to use
1344 * @param queue_size size of the per-peer message queue
1345 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1346 * @param init callback to call on timeout or once we have successfully
1347 * connected to the core service; note that timeout is only meaningful if init is not NULL
1348 * @param connects function to call on peer connect, can be NULL
1349 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1350 * @param status_events function to call on changes to peer connection status, can be NULL
1351 * @param inbound_notify function to call for all inbound messages, can be NULL
1352 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1353 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1354 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1355 * @param outbound_notify function to call for all outbound messages, can be NULL
1356 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1357 * GNUNET_MessageHeader and hence we do not need to give it the full message
1358 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1359 * @param handlers callbacks for messages we care about, NULL-terminated
1360 * @return handle to the core service (only useful for disconnect until 'init' is called);
1361 * NULL on error (in this case, init is never called)
1363 struct GNUNET_CORE_Handle *
1364 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1365 unsigned int queue_size,
1367 GNUNET_CORE_StartupCallback init,
1368 GNUNET_CORE_ConnectEventHandler connects,
1369 GNUNET_CORE_DisconnectEventHandler disconnects,
1370 GNUNET_CORE_PeerStatusEventHandler status_events,
1371 GNUNET_CORE_MessageCallback inbound_notify,
1372 int inbound_hdr_only,
1373 GNUNET_CORE_MessageCallback outbound_notify,
1374 int outbound_hdr_only,
1375 const struct GNUNET_CORE_MessageHandler *handlers)
1377 struct GNUNET_CORE_Handle *h;
1379 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1381 h->queue_size = queue_size;
1384 h->connects = connects;
1385 h->disconnects = disconnects;
1386 h->status_events = status_events;
1387 h->inbound_notify = inbound_notify;
1388 h->outbound_notify = outbound_notify;
1389 h->inbound_hdr_only = inbound_hdr_only;
1390 h->outbound_hdr_only = outbound_hdr_only;
1391 h->handlers = handlers;
1393 h->currently_down = GNUNET_YES;
1394 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1395 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1396 while (handlers[h->hcnt].callback != NULL)
1398 GNUNET_assert (h->hcnt <
1399 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1400 sizeof (struct InitMessage)) / sizeof (uint16_t));
1402 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1403 "Connecting to CORE service\n");
1411 * Disconnect from the core service. This function can only
1412 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1413 * requests have been explicitly canceled.
1415 * @param handle connection to core to disconnect
1418 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1420 struct ControlMessage *cm;
1423 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1424 "Disconnecting from CORE service\n");
1426 if (handle->cth != NULL)
1428 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1431 if (handle->client != NULL)
1433 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1434 handle->client = NULL;
1436 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1438 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1439 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1441 while (NULL != (cm = handle->pending_head))
1443 GNUNET_CONTAINER_DLL_remove (handle->pending_head,
1444 handle->pending_tail,
1448 if (cm->cont != NULL)
1449 cm->cont (cm->cont_cls, NULL);
1452 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1453 &disconnect_and_free_peer_entry,
1455 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1456 GNUNET_break (handle->ready_peer_head == NULL);
1457 GNUNET_free (handle);
1462 * Ask the core to call "notify" once it is ready to transmit the
1463 * given number of bytes to the specified "target". If we are not yet
1464 * connected to the specified peer, a call to this function will cause
1465 * us to try to establish a connection.
1467 * @param handle connection to core service
1468 * @param priority how important is the message?
1469 * @param maxdelay how long can the message wait?
1470 * @param target who should receive the message,
1471 * use NULL for this peer (loopback)
1472 * @param notify_size how many bytes of buffer space does notify want?
1473 * @param notify function to call when buffer space is available
1474 * @param notify_cls closure for notify
1475 * @return non-NULL if the notify callback was queued,
1476 * NULL if we can not even queue the request (insufficient
1477 * memory); if NULL is returned, "notify" will NOT be called.
1479 struct GNUNET_CORE_TransmitHandle *
1480 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1482 struct GNUNET_TIME_Relative maxdelay,
1483 const struct GNUNET_PeerIdentity *target,
1485 GNUNET_CONNECTION_TransmitReadyNotify notify,
1488 struct PeerRecord *pr;
1489 struct GNUNET_CORE_TransmitHandle *th;
1490 struct GNUNET_CORE_TransmitHandle *pos;
1491 struct GNUNET_CORE_TransmitHandle *prev;
1492 struct GNUNET_CORE_TransmitHandle *minp;
1494 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1495 &target->hashPubKey);
1498 /* attempt to send to peer that is not connected */
1499 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1500 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1501 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1505 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1506 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1507 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1509 th->get_message = notify;
1510 th->get_message_cls = notify_cls;
1511 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1512 th->priority = priority;
1513 th->msize = notify_size;
1514 /* bound queue size */
1515 if (pr->queue_size == handle->queue_size)
1517 /* find lowest-priority entry */
1518 minp = pr->pending_head;
1520 while (prev != NULL)
1522 if (prev->priority < minp->priority)
1528 GNUNET_break (handle->queue_size != 0);
1529 GNUNET_break (pr->queue_size == 0);
1532 if (priority <= minp->priority)
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1536 "Dropping transmission request: priority too low\n");
1538 return NULL; /* priority too low */
1540 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1545 minp->get_message (minp->get_message_cls,
1550 /* Order entries by deadline, but SKIP 'HEAD' if
1551 we're in the 'ready_peer_*' DLL */
1552 pos = pr->pending_head;
1553 if ( (pr->prev != NULL) ||
1554 (pr->next != NULL) ||
1555 (pr == handle->ready_peer_head) )
1557 GNUNET_assert (pos != NULL);
1558 pos = pos->next; /* skip head */
1561 /* insertion sort */
1563 while ( (pos != NULL) &&
1564 (pos->timeout.abs_value < th->timeout.abs_value) )
1569 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1574 /* was the request queue previously empty? */
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1577 "Transmission request added to queue\n");
1579 if (pr->pending_head == th)
1580 request_next_transmission (pr);
1586 * Cancel the specified transmission-ready notification.
1588 * @param th handle that was returned by "notify_transmit_ready".
1591 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1594 struct PeerRecord *pr = th->peer;
1595 struct GNUNET_CORE_Handle *h = pr->ch;
1598 was_head = (pr->pending_head == th);
1599 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1605 /* we're currently in the control queue, remove */
1606 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1609 GNUNET_free (th->cm);
1614 if ( (pr->prev != NULL) ||
1615 (pr->next != NULL) ||
1616 (pr == h->ready_peer_head) )
1618 /* the request that was 'approved' by core was
1619 canceled before it could be transmitted; remove
1620 us from the 'ready' list */
1621 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1625 request_next_transmission (pr);
1630 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1633 * Handle for a request to the core to connect to
1634 * a particular peer. Can be used to cancel the request
1635 * (before the 'cont'inuation is called).
1637 struct GNUNET_CORE_PeerRequestHandle
1641 * Link to control message.
1643 struct ControlMessage *cm;
1648 struct GNUNET_CORE_Handle *h;
1651 * Continuation to run when done.
1653 GNUNET_SCHEDULER_Task cont;
1656 * Closure for 'cont'.
1664 * Continuation called when the control message was transmitted.
1665 * Calls the original continuation and frees the remaining
1668 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1669 * @param tc scheduler context
1672 peer_request_connect_cont (void *cls,
1673 const struct GNUNET_SCHEDULER_TaskContext *tc)
1675 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1677 if (ret->cont != NULL)
1680 GNUNET_SCHEDULER_add_now (ret->cont,
1683 ret->cont (ret->cont_cls, tc);
1690 * Request that the core should try to connect to a particular peer.
1691 * Once the request has been transmitted to the core, the continuation
1692 * function will be called. Note that this does NOT mean that a
1693 * connection was successfully established -- it only means that the
1694 * core will now try. Successful establishment of the connection
1695 * will be signalled to the 'connects' callback argument of
1696 * 'GNUNET_CORE_connect' only. If the core service does not respond
1697 * to our connection attempt within the given time frame, 'cont' will
1698 * be called with the TIMEOUT reason code.
1700 * @param h core handle
1701 * @param timeout how long to try to talk to core
1702 * @param peer who should we connect to
1703 * @param cont function to call once the request has been completed (or timed out)
1704 * @param cont_cls closure for cont
1705 * @return NULL on error (cont will not be called), otherwise handle for cancellation
1707 struct GNUNET_CORE_PeerRequestHandle *
1708 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1709 struct GNUNET_TIME_Relative timeout,
1710 const struct GNUNET_PeerIdentity * peer,
1711 GNUNET_SCHEDULER_Task cont,
1714 struct GNUNET_CORE_PeerRequestHandle *ret;
1715 struct ControlMessage *cm;
1716 struct ConnectMessage *msg;
1718 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1719 sizeof (struct ConnectMessage));
1720 msg = (struct ConnectMessage*) &cm[1];
1721 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1722 msg->header.size = htons (sizeof (struct ConnectMessage));
1723 msg->reserved = htonl (0);
1724 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1726 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1729 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1733 ret->cont_cls = cont_cls;
1734 cm->cont = &peer_request_connect_cont;
1737 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1738 "Queueing REQUEST_CONNECT request\n");
1740 if (h->pending_head == cm)
1741 trigger_next_request (h, GNUNET_NO);
1747 * Cancel a pending request to connect to a particular peer. Must not
1748 * be called after the 'cont' function was invoked.
1750 * @param req request handle that was returned for the original request
1753 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1755 struct GNUNET_CORE_Handle *h = req->h;
1756 struct ControlMessage *cm = req->cm;
1758 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1766 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1769 struct GNUNET_CORE_InformationRequestContext
1773 * Our connection to the service.
1775 struct GNUNET_CORE_Handle *h;
1778 * Function to call with the information.
1780 GNUNET_CORE_PeerConfigurationInfoCallback info;
1788 * Link to control message, NULL if CM was sent.
1790 struct ControlMessage *cm;
1793 * Link to peer record.
1795 struct PeerRecord *pr;
1800 * CM was sent, remove link so we don't double-free.
1802 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1803 * @param tc scheduler context
1806 change_preference_send_continuation (void *cls,
1807 const struct GNUNET_SCHEDULER_TaskContext *tc)
1809 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1816 * Obtain statistics and/or change preferences for the given peer.
1818 * @param h core handle
1819 * @param peer identifies the peer
1820 * @param timeout after how long should we give up (and call "info" with NULL
1821 * for "peer" to signal an error)?
1822 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1823 * caller should set "bw_out" to "-1" to avoid changing
1824 * the current value; otherwise "bw_out" will be lowered to
1825 * the specified value; passing a pointer to "0" can be used to force
1826 * us to disconnect from the peer; "bw_out" might not increase
1827 * as specified since the upper bound is generally
1828 * determined by the other peer!
1829 * @param amount reserve N bytes for receiving, negative
1830 * amounts can be used to undo a (recent) reservation;
1831 * @param preference increase incoming traffic share preference by this amount;
1832 * in the absence of "amount" reservations, we use this
1833 * preference value to assign proportional bandwidth shares
1834 * to all connected peers
1835 * @param info function to call with the resulting configuration information
1836 * @param info_cls closure for info
1837 * @return NULL on error
1839 struct GNUNET_CORE_InformationRequestContext *
1840 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1841 const struct GNUNET_PeerIdentity *peer,
1842 struct GNUNET_TIME_Relative timeout,
1843 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1845 uint64_t preference,
1846 GNUNET_CORE_PeerConfigurationInfoCallback info,
1849 struct GNUNET_CORE_InformationRequestContext *irc;
1850 struct PeerRecord *pr;
1851 struct RequestInfoMessage *rim;
1852 struct ControlMessage *cm;
1854 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1858 /* attempt to change preference on peer that is not connected */
1862 if (pr->pcic != NULL)
1864 /* second change before first one is done */
1868 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1872 irc->info_cls = info_cls;
1873 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1874 sizeof (struct RequestInfoMessage));
1875 cm->cont = &change_preference_send_continuation;
1878 rim = (struct RequestInfoMessage*) &cm[1];
1879 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1880 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1881 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1882 rim->limit_outbound = bw_out;
1883 rim->reserve_inbound = htonl (amount);
1884 rim->preference_change = GNUNET_htonll(preference);
1887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1888 "Queueing CHANGE PREFERENCE request\n");
1890 GNUNET_CONTAINER_DLL_insert (h->pending_head,
1894 pr->pcic_cls = info_cls;
1895 if (h->pending_head == cm)
1896 trigger_next_request (h, GNUNET_NO);
1902 * Cancel request for getting information about a peer.
1903 * Note that an eventual change in preference, trust or bandwidth
1904 * assignment MAY have already been committed at the time,
1905 * so cancelling a request is NOT sure to undo the original
1906 * request. The original request may or may not still commit.
1907 * The only thing cancellation ensures is that the callback
1908 * from the original request will no longer be called.
1910 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1913 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1915 struct GNUNET_CORE_Handle *h = irc->h;
1916 struct PeerRecord *pr = irc->pr;
1918 if (irc->cm != NULL)
1920 GNUNET_CONTAINER_DLL_remove (h->pending_head,
1923 GNUNET_free (irc->cm);
1926 pr->pcic_cls = NULL;
1931 /* end of core_api.c */