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 transmission failed/succeeded.
134 GNUNET_CORE_ControlContinuation cont;
137 * Closure for 'cont'.
142 * Transmit handle (if one is associated with this ControlMessage), or NULL.
144 struct GNUNET_CORE_TransmitHandle *th;
150 * Context for the core service connection.
152 struct GNUNET_CORE_Handle
156 * Configuration we're using.
158 const struct GNUNET_CONFIGURATION_Handle *cfg;
161 * Closure for the various callbacks.
166 * Function to call once we've handshaked with the core service.
168 GNUNET_CORE_StartupCallback init;
171 * Function to call whenever we're notified about a peer connecting.
173 GNUNET_CORE_ConnectEventHandler connects;
176 * Function to call whenever we're notified about a peer disconnecting.
178 GNUNET_CORE_DisconnectEventHandler disconnects;
181 * Function to call whenever we're notified about a peer changing status.
183 GNUNET_CORE_PeerStatusEventHandler status_events;
186 * Function to call whenever we receive an inbound message.
188 GNUNET_CORE_MessageCallback inbound_notify;
191 * Function to call whenever we receive an outbound message.
193 GNUNET_CORE_MessageCallback outbound_notify;
196 * Function handlers for messages of particular type.
198 const struct GNUNET_CORE_MessageHandler *handlers;
201 * Our connection to the service.
203 struct GNUNET_CLIENT_Connection *client;
206 * Handle for our current transmission request.
208 struct GNUNET_CLIENT_TransmitHandle *cth;
211 * Head of doubly-linked list of pending requests.
213 struct ControlMessage *control_pending_head;
216 * Tail of doubly-linked list of pending requests.
218 struct ControlMessage *control_pending_tail;
221 * Head of doubly-linked list of peers that are core-approved
222 * to send their next message.
224 struct PeerRecord *ready_peer_head;
227 * Tail of doubly-linked list of peers that are core-approved
228 * to send their next message.
230 struct PeerRecord *ready_peer_tail;
233 * Hash map listing all of the peers that we are currently
236 struct GNUNET_CONTAINER_MultiHashMap *peers;
239 * Identity of this peer.
241 struct GNUNET_PeerIdentity me;
244 * ID of reconnect task (if any).
246 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
249 * Current delay we use for re-trying to connect to core.
251 struct GNUNET_TIME_Relative retry_backoff;
254 * Request information ID generator.
259 * Number of messages we are allowed to queue per target.
261 unsigned int queue_size;
264 * Number of entries in the handlers array.
269 * For inbound notifications without a specific handler, do
270 * we expect to only receive headers?
272 int inbound_hdr_only;
275 * For outbound notifications without a specific handler, do
276 * we expect to only receive headers?
278 int outbound_hdr_only;
281 * Are we currently disconnected and hence unable to forward
290 * Handle for a transmission request.
292 struct GNUNET_CORE_TransmitHandle
296 * We keep active transmit handles in a doubly-linked list.
298 struct GNUNET_CORE_TransmitHandle *next;
301 * We keep active transmit handles in a doubly-linked list.
303 struct GNUNET_CORE_TransmitHandle *prev;
306 * Corresponding peer record.
308 struct PeerRecord *peer;
311 * Corresponding SEND_REQUEST message. Only non-NULL
312 * while SEND_REQUEST message is pending.
314 struct ControlMessage *cm;
317 * Function that will be called to get the actual request
318 * (once we are ready to transmit this request to the core).
319 * The function will be called with a NULL buffer to signal
322 GNUNET_CONNECTION_TransmitReadyNotify get_message;
325 * Closure for get_message.
327 void *get_message_cls;
330 * Timeout for this handle.
332 struct GNUNET_TIME_Absolute timeout;
335 * How important is this message?
340 * Size of this request.
345 * Send message request ID for this request.
353 * Our current client connection went down. Clean it up
354 * and try to reconnect!
356 * @param h our handle to the core service
359 reconnect (struct GNUNET_CORE_Handle *h);
363 * Task schedule to try to re-connect to core.
365 * @param cls the 'struct GNUNET_CORE_Handle'
366 * @param tc task context
369 reconnect_task (void *cls,
370 const struct GNUNET_SCHEDULER_TaskContext *tc)
372 struct GNUNET_CORE_Handle *h = cls;
374 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
376 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
377 "Connecting to CORE service after delay\n");
384 * Notify clients about disconnect and free
385 * the entry for connected peer.
387 * @param cls the 'struct GNUNET_CORE_Handle*'
388 * @param key the peer identity (not used)
389 * @param value the 'struct PeerRecord' to free.
390 * @return GNUNET_YES (continue)
393 disconnect_and_free_peer_entry (void *cls,
394 const GNUNET_HashCode *key,
397 static struct GNUNET_BANDWIDTH_Value32NBO zero;
398 struct GNUNET_CORE_Handle *h = cls;
399 struct GNUNET_CORE_TransmitHandle *th;
400 struct PeerRecord *pr = value;
401 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
403 while (NULL != (th = pr->pending_head))
405 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
410 th->get_message (th->get_message_cls,
414 if (NULL != (pcic = pr->pcic))
422 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
424 GNUNET_SCHEDULER_cancel (pr->timeout_task);
425 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
427 GNUNET_assert (pr->queue_size == 0);
428 if ( (pr->prev != NULL) ||
429 (pr->next != NULL) ||
430 (h->ready_peer_head == pr) )
431 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
434 if (h->disconnects != NULL)
435 h->disconnects (h->cls,
437 GNUNET_assert (GNUNET_YES ==
438 GNUNET_CONTAINER_multihashmap_remove (h->peers,
441 GNUNET_assert (pr->pending_head == NULL);
442 GNUNET_assert (pr->pending_tail == NULL);
443 GNUNET_assert (pr->ch = h);
444 GNUNET_assert (pr->queue_size == 0);
445 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
452 * Close down any existing connection to the CORE service and
453 * try re-establishing it later.
455 * @param h our handle
458 reconnect_later (struct GNUNET_CORE_Handle *h)
460 struct ControlMessage *cm;
461 struct PeerRecord *pr;
463 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
464 if (h->client != NULL)
466 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
469 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
470 &disconnect_and_free_peer_entry,
473 while (NULL != (pr = h->ready_peer_head))
474 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
477 h->currently_down = GNUNET_YES;
478 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
481 while (NULL != (cm = h->control_pending_head))
483 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
484 h->control_pending_tail,
488 if (cm->cont != NULL)
489 cm->cont (cm->cont_cls, GNUNET_NO);
492 GNUNET_assert (h->control_pending_head == NULL);
493 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
495 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
500 * Check the list of pending requests, send the next
503 * @param h core handle
504 * @param ignore_currently_down transmit message even if not initialized?
507 trigger_next_request (struct GNUNET_CORE_Handle *h,
508 int ignore_currently_down);
512 * The given request hit its timeout. Remove from the
513 * doubly-linked list and call the respective continuation.
515 * @param cls the transmit handle of the request that timed out
516 * @param tc context, can be NULL (!)
519 transmission_timeout (void *cls,
520 const struct GNUNET_SCHEDULER_TaskContext *tc);
524 * Send a control message to the peer asking for transmission
525 * of the message in the given peer record.
527 * @param pr peer to request transmission to
530 request_next_transmission (struct PeerRecord *pr)
532 struct GNUNET_CORE_Handle *h = pr->ch;
533 struct ControlMessage *cm;
534 struct SendMessageRequest *smr;
535 struct GNUNET_CORE_TransmitHandle *th;
537 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
539 GNUNET_SCHEDULER_cancel (pr->timeout_task);
540 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
542 if (NULL == (th = pr->pending_head))
544 trigger_next_request (h, GNUNET_NO);
547 GNUNET_assert (pr->prev == NULL);
548 GNUNET_assert (pr->next == NULL);
549 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
550 &transmission_timeout,
552 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
553 sizeof (struct SendMessageRequest));
556 smr = (struct SendMessageRequest*) &cm[1];
557 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
558 smr->header.size = htons (sizeof (struct SendMessageRequest));
559 smr->priority = htonl (th->priority);
560 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
561 smr->peer = pr->peer;
562 smr->queue_size = htonl (pr->queue_size);
563 smr->size = htons (th->msize);
564 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
565 GNUNET_CONTAINER_DLL_insert_after (h->control_pending_head,
566 h->control_pending_tail,
567 h->control_pending_tail,
570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
571 "Adding SEND REQUEST for peer `%s' to message queue\n",
572 GNUNET_i2s (&pr->peer));
574 trigger_next_request (h, GNUNET_NO);
579 * The given request hit its timeout. Remove from the
580 * doubly-linked list and call the respective continuation.
582 * @param cls the transmit handle of the request that timed out
583 * @param tc context, can be NULL (!)
586 transmission_timeout (void *cls,
587 const struct GNUNET_SCHEDULER_TaskContext *tc)
589 struct PeerRecord *pr = cls;
590 struct GNUNET_CORE_Handle *h = pr->ch;
591 struct GNUNET_CORE_TransmitHandle *th;
593 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
594 th = pr->pending_head;
595 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
599 if ( (pr->prev != NULL) ||
600 (pr->next != NULL) ||
601 (pr == h->ready_peer_head) )
603 /* the request that was 'approved' by core was
604 canceled before it could be transmitted; remove
605 us from the 'ready' list */
606 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
611 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
612 "Signalling timeout of request for transmission to CORE service\n");
614 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
615 request_next_transmission (pr);
620 * Transmit the next message to the core service.
623 transmit_message (void *cls,
627 struct GNUNET_CORE_Handle *h = cls;
628 struct ControlMessage *cm;
629 struct GNUNET_CORE_TransmitHandle *th;
630 struct PeerRecord *pr;
631 struct SendMessage *sm;
632 const struct GNUNET_MessageHeader *hdr;
636 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
642 "Transmission failed, initiating reconnect\n");
647 /* first check for control messages */
648 if (NULL != (cm = h->control_pending_head))
650 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
651 msize = ntohs (hdr->size);
654 trigger_next_request (h, GNUNET_NO);
658 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
659 "Transmitting control message with %u bytes of type %u to core.\n",
660 (unsigned int) msize,
661 (unsigned int) ntohs (hdr->type));
663 memcpy (buf, hdr, msize);
664 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
665 h->control_pending_tail,
669 if (NULL != cm->cont)
670 cm->cont (cm->cont_cls, GNUNET_OK);
672 trigger_next_request (h, GNUNET_NO);
675 /* now check for 'ready' P2P messages */
676 if (NULL != (pr = h->ready_peer_head))
678 GNUNET_assert (pr->pending_head != NULL);
679 th = pr->pending_head;
680 if (size < th->msize + sizeof (struct SendMessage))
682 trigger_next_request (h, GNUNET_NO);
685 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
688 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
692 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
694 GNUNET_SCHEDULER_cancel (pr->timeout_task);
695 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
698 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
699 "Transmitting SEND request to `%s' with %u bytes.\n",
700 GNUNET_i2s (&pr->peer),
701 (unsigned int) th->msize);
703 sm = (struct SendMessage *) buf;
704 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
705 sm->priority = htonl (th->priority);
706 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
708 ret = th->get_message (th->get_message_cls,
709 size - sizeof (struct SendMessage),
715 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
716 "Size of clients message to peer %s is 0!\n",
717 GNUNET_i2s(&pr->peer));
719 /* client decided to send nothing! */
720 request_next_transmission (pr);
724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
725 "Produced SEND message to core with %u bytes payload\n",
728 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
729 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
732 request_next_transmission (pr);
735 ret += sizeof (struct SendMessage);
736 sm->header.size = htons (ret);
737 GNUNET_assert (ret <= size);
739 request_next_transmission (pr);
747 * Check the list of pending requests, send the next
750 * @param h core handle
751 * @param ignore_currently_down transmit message even if not initialized?
754 trigger_next_request (struct GNUNET_CORE_Handle *h,
755 int ignore_currently_down)
759 if ( (GNUNET_YES == h->currently_down) &&
760 (ignore_currently_down == GNUNET_NO) )
763 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
764 "Core connection down, not processing queue\n");
771 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
772 "Request pending, not processing queue\n");
776 if (h->control_pending_head != NULL)
777 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
778 else if (h->ready_peer_head != NULL)
779 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
784 "Request queue empty, not processing queue\n");
786 return; /* no pending message */
788 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
790 GNUNET_TIME_UNIT_FOREVER_REL,
792 &transmit_message, h);
797 * Handler for notification messages received from the core.
799 * @param cls our "struct GNUNET_CORE_Handle"
800 * @param msg the message received from the core service
803 main_notify_handler (void *cls,
804 const struct GNUNET_MessageHeader *msg)
806 struct GNUNET_CORE_Handle *h = cls;
807 const struct InitReplyMessage *m;
808 const struct ConnectNotifyMessage *cnm;
809 const struct DisconnectNotifyMessage *dnm;
810 const struct NotifyTrafficMessage *ntm;
811 const struct GNUNET_MessageHeader *em;
812 const struct ConfigurationInfoMessage *cim;
813 const struct PeerStatusNotifyMessage *psnm;
814 const struct SendMessageReady *smr;
815 const struct GNUNET_CORE_MessageHandler *mh;
816 GNUNET_CORE_StartupCallback init;
817 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
818 struct PeerRecord *pr;
819 struct GNUNET_CORE_TransmitHandle *th;
828 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
830 ("Client was disconnected from core service, trying to reconnect.\n"));
834 msize = ntohs (msg->size);
836 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
837 "Processing message of type %u and size %u from core service\n",
838 ntohs (msg->type), msize);
840 switch (ntohs (msg->type))
842 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
843 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
849 m = (const struct InitReplyMessage *) msg;
850 GNUNET_break (0 == ntohl (m->reserved));
851 /* start our message processing loop */
852 if (GNUNET_YES == h->currently_down)
854 h->currently_down = GNUNET_NO;
855 trigger_next_request (h, GNUNET_NO);
857 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
858 GNUNET_CRYPTO_hash (&m->publicKey,
860 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
862 if (NULL != (init = h->init))
864 /* mark so we don't call init on reconnect */
867 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
868 "Connected to core service of peer `%s'.\n",
869 GNUNET_i2s (&h->me));
871 init (h->cls, h, &h->me, &m->publicKey);
876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
877 "Successfully reconnected to core service.\n");
880 /* fake 'connect to self' */
881 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
883 GNUNET_assert (pr == NULL);
884 pr = GNUNET_malloc (sizeof (struct PeerRecord));
887 GNUNET_assert (GNUNET_YES ==
888 GNUNET_CONTAINER_multihashmap_put (h->peers,
891 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
892 if (NULL != h->connects)
897 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
898 if (msize < sizeof (struct ConnectNotifyMessage))
904 cnm = (const struct ConnectNotifyMessage *) msg;
905 ats_count = ntohl (cnm->ats_count);
906 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
907 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Received notification about connection from `%s'.\n",
916 GNUNET_i2s (&cnm->peer));
918 if (0 == memcmp (&h->me,
920 sizeof (struct GNUNET_PeerIdentity)))
922 /* disconnect from self!? */
926 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
927 &cnm->peer.hashPubKey);
934 pr = GNUNET_malloc (sizeof (struct PeerRecord));
935 pr->peer = cnm->peer;
937 GNUNET_assert (GNUNET_YES ==
938 GNUNET_CONTAINER_multihashmap_put (h->peers,
939 &cnm->peer.hashPubKey,
941 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
942 if (NULL != h->connects)
947 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
948 if (msize != sizeof (struct DisconnectNotifyMessage))
954 dnm = (const struct DisconnectNotifyMessage *) msg;
955 if (0 == memcmp (&h->me,
957 sizeof (struct GNUNET_PeerIdentity)))
959 /* connection to self!? */
963 GNUNET_break (0 == ntohl (dnm->reserved));
965 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
966 "Received notification about disconnect from `%s'.\n",
967 GNUNET_i2s (&dnm->peer));
969 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
970 &dnm->peer.hashPubKey);
977 trigger = ( (pr->prev != NULL) ||
978 (pr->next != NULL) ||
979 (h->ready_peer_head == pr) );
980 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
982 trigger_next_request (h, GNUNET_NO);
984 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
985 if (NULL == h->status_events)
990 if (msize < sizeof (struct PeerStatusNotifyMessage))
996 psnm = (const struct PeerStatusNotifyMessage *) msg;
997 if (0 == memcmp (&h->me,
999 sizeof (struct GNUNET_PeerIdentity)))
1005 ats_count = ntohl (psnm->ats_count);
1006 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1007 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1010 reconnect_later (h);
1014 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1015 "Received notification about status change by `%s'.\n",
1016 GNUNET_i2s (&psnm->peer));
1018 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1019 &psnm->peer.hashPubKey);
1023 reconnect_later (h);
1026 h->status_events (h->cls,
1029 psnm->bandwidth_out,
1030 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1033 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1034 if (msize < sizeof (struct NotifyTrafficMessage))
1037 reconnect_later (h);
1040 ntm = (const struct NotifyTrafficMessage *) msg;
1041 if (0 == memcmp (&h->me,
1043 sizeof (struct GNUNET_PeerIdentity)))
1049 ats_count = ntohl (ntm->ats_count);
1050 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1051 + sizeof (struct GNUNET_MessageHeader)) ||
1052 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1055 reconnect_later (h);
1058 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1060 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1061 "Received message of type %u and size %u from peer `%4s'\n",
1064 GNUNET_i2s (&ntm->peer));
1066 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1067 &ntm->peer.hashPubKey);
1071 reconnect_later (h);
1074 if ((GNUNET_NO == h->inbound_hdr_only) &&
1075 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1076 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1079 reconnect_later (h);
1082 et = ntohs (em->type);
1083 for (hpos = 0; hpos < h->hcnt; hpos++)
1085 mh = &h->handlers[hpos];
1088 if ((mh->expected_size != ntohs (em->size)) &&
1089 (mh->expected_size != 0))
1095 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1098 /* error in processing, do not process other messages! */
1102 if (NULL != h->inbound_notify)
1103 h->inbound_notify (h->cls, &ntm->peer, em,
1106 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1107 if (msize < sizeof (struct NotifyTrafficMessage))
1110 reconnect_later (h);
1113 ntm = (const struct NotifyTrafficMessage *) msg;
1114 if (0 == memcmp (&h->me,
1116 sizeof (struct GNUNET_PeerIdentity)))
1122 ats_count = ntohl (ntm->ats_count);
1123 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1124 + sizeof (struct GNUNET_MessageHeader)) ||
1125 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1128 reconnect_later (h);
1131 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1132 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1133 &ntm->peer.hashPubKey);
1137 reconnect_later (h);
1141 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1142 "Received notification about transmission to `%s'.\n",
1143 GNUNET_i2s (&ntm->peer));
1145 if ((GNUNET_NO == h->outbound_hdr_only) &&
1146 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1147 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1150 reconnect_later (h);
1153 if (NULL == h->outbound_notify)
1158 h->outbound_notify (h->cls, &ntm->peer, em,
1161 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1162 if (msize != sizeof (struct SendMessageReady))
1165 reconnect_later (h);
1168 smr = (const struct SendMessageReady *) msg;
1169 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1170 &smr->peer.hashPubKey);
1174 reconnect_later (h);
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 "Received notification about transmission readiness to `%s'.\n",
1180 GNUNET_i2s (&smr->peer));
1182 if (pr->pending_head == NULL)
1184 /* request must have been cancelled between the original request
1185 and the response from core, ignore core's readiness */
1189 th = pr->pending_head;
1190 if (ntohs (smr->smr_id) != th->smr_id)
1192 /* READY message is for expired or cancelled message,
1193 ignore! (we should have already sent another request) */
1196 if ( (pr->prev != NULL) ||
1197 (pr->next != NULL) ||
1198 (h->ready_peer_head == pr) )
1200 /* we should not already be on the ready list... */
1202 reconnect_later (h);
1205 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1208 trigger_next_request (h, GNUNET_NO);
1210 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1211 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1214 reconnect_later (h);
1217 cim = (const struct ConfigurationInfoMessage*) msg;
1218 if (0 == memcmp (&h->me,
1220 sizeof (struct GNUNET_PeerIdentity)))
1227 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1228 "Received notification about configuration update for `%s'.\n",
1229 GNUNET_i2s (&cim->peer));
1231 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1232 &cim->peer.hashPubKey);
1236 reconnect_later (h);
1239 if (pr->rim_id != ntohl (cim->rim_id))
1247 ntohl (cim->reserved_amount),
1248 GNUNET_ntohll (cim->preference));
1251 reconnect_later (h);
1254 GNUNET_CLIENT_receive (h->client,
1255 &main_notify_handler, h,
1256 GNUNET_TIME_UNIT_FOREVER_REL);
1261 * Task executed once we are done transmitting the INIT message.
1262 * Starts our 'receive' loop.
1264 * @param cls the 'struct GNUNET_CORE_Handle'
1265 * @param success were we successful
1268 init_done_task (void *cls,
1271 struct GNUNET_CORE_Handle *h = cls;
1273 if (success == GNUNET_SYSERR)
1274 return; /* shutdown */
1275 if (success == GNUNET_NO)
1278 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1279 "Failed to exchange INIT with core, retrying\n");
1281 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1282 reconnect_later (h);
1285 GNUNET_CLIENT_receive (h->client,
1286 &main_notify_handler,
1288 GNUNET_TIME_UNIT_FOREVER_REL);
1293 * Our current client connection went down. Clean it up
1294 * and try to reconnect!
1296 * @param h our handle to the core service
1299 reconnect (struct GNUNET_CORE_Handle *h)
1301 struct ControlMessage *cm;
1302 struct InitMessage *init;
1309 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1310 "Reconnecting to CORE service\n");
1312 GNUNET_assert (h->client == NULL);
1313 GNUNET_assert (h->currently_down == GNUNET_YES);
1314 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1315 if (h->client == NULL)
1317 reconnect_later (h);
1320 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1321 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1323 cm->cont = &init_done_task;
1325 init = (struct InitMessage*) &cm[1];
1326 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1327 init->header.size = htons (msize);
1328 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1329 if (h->status_events != NULL)
1330 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1331 if (h->inbound_notify != NULL)
1333 if (h->inbound_hdr_only)
1334 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1336 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1338 if (h->outbound_notify != NULL)
1340 if (h->outbound_hdr_only)
1341 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1343 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1345 init->options = htonl (opt);
1346 ts = (uint16_t *) &init[1];
1347 for (hpos = 0; hpos < h->hcnt; hpos++)
1348 ts[hpos] = htons (h->handlers[hpos].type);
1349 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1350 h->control_pending_tail,
1352 trigger_next_request (h, GNUNET_YES);
1358 * Connect to the core service. Note that the connection may
1359 * complete (or fail) asynchronously.
1361 * @param cfg configuration to use
1362 * @param queue_size size of the per-peer message queue
1363 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1364 * @param init callback to call on timeout or once we have successfully
1365 * connected to the core service; note that timeout is only meaningful if init is not NULL
1366 * @param connects function to call on peer connect, can be NULL
1367 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1368 * @param status_events function to call on changes to peer connection status, can be NULL
1369 * @param inbound_notify function to call for all inbound messages, can be NULL
1370 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1371 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1372 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1373 * @param outbound_notify function to call for all outbound messages, can be NULL
1374 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1375 * GNUNET_MessageHeader and hence we do not need to give it the full message
1376 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1377 * @param handlers callbacks for messages we care about, NULL-terminated
1378 * @return handle to the core service (only useful for disconnect until 'init' is called);
1379 * NULL on error (in this case, init is never called)
1381 struct GNUNET_CORE_Handle *
1382 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1383 unsigned int queue_size,
1385 GNUNET_CORE_StartupCallback init,
1386 GNUNET_CORE_ConnectEventHandler connects,
1387 GNUNET_CORE_DisconnectEventHandler disconnects,
1388 GNUNET_CORE_PeerStatusEventHandler status_events,
1389 GNUNET_CORE_MessageCallback inbound_notify,
1390 int inbound_hdr_only,
1391 GNUNET_CORE_MessageCallback outbound_notify,
1392 int outbound_hdr_only,
1393 const struct GNUNET_CORE_MessageHandler *handlers)
1395 struct GNUNET_CORE_Handle *h;
1397 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1399 h->queue_size = queue_size;
1402 h->connects = connects;
1403 h->disconnects = disconnects;
1404 h->status_events = status_events;
1405 h->inbound_notify = inbound_notify;
1406 h->outbound_notify = outbound_notify;
1407 h->inbound_hdr_only = inbound_hdr_only;
1408 h->outbound_hdr_only = outbound_hdr_only;
1409 h->handlers = handlers;
1411 h->currently_down = GNUNET_YES;
1412 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1413 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1414 while (handlers[h->hcnt].callback != NULL)
1416 GNUNET_assert (h->hcnt <
1417 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1418 sizeof (struct InitMessage)) / sizeof (uint16_t));
1420 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1421 "Connecting to CORE service\n");
1429 * Disconnect from the core service. This function can only
1430 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1431 * requests have been explicitly canceled.
1433 * @param handle connection to core to disconnect
1436 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1438 struct ControlMessage *cm;
1441 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1442 "Disconnecting from CORE service\n");
1444 if (handle->cth != NULL)
1446 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1449 if (handle->client != NULL)
1451 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1452 handle->client = NULL;
1454 while (NULL != (cm = handle->control_pending_head))
1456 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1457 handle->control_pending_tail,
1461 if (cm->cont != NULL)
1462 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1465 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1467 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1468 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1470 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1471 &disconnect_and_free_peer_entry,
1473 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1474 GNUNET_break (handle->ready_peer_head == NULL);
1475 GNUNET_free (handle);
1480 * Ask the core to call "notify" once it is ready to transmit the
1481 * given number of bytes to the specified "target". If we are not yet
1482 * connected to the specified peer, a call to this function will cause
1483 * us to try to establish a connection.
1485 * @param handle connection to core service
1486 * @param priority how important is the message?
1487 * @param maxdelay how long can the message wait?
1488 * @param target who should receive the message,
1489 * use NULL for this peer (loopback)
1490 * @param notify_size how many bytes of buffer space does notify want?
1491 * @param notify function to call when buffer space is available
1492 * @param notify_cls closure for notify
1493 * @return non-NULL if the notify callback was queued,
1494 * NULL if we can not even queue the request (insufficient
1495 * memory); if NULL is returned, "notify" will NOT be called.
1497 struct GNUNET_CORE_TransmitHandle *
1498 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1500 struct GNUNET_TIME_Relative maxdelay,
1501 const struct GNUNET_PeerIdentity *target,
1503 GNUNET_CONNECTION_TransmitReadyNotify notify,
1506 struct PeerRecord *pr;
1507 struct GNUNET_CORE_TransmitHandle *th;
1508 struct GNUNET_CORE_TransmitHandle *pos;
1509 struct GNUNET_CORE_TransmitHandle *prev;
1510 struct GNUNET_CORE_TransmitHandle *minp;
1512 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1513 &target->hashPubKey);
1516 /* attempt to send to peer that is not connected */
1517 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1518 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1519 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1523 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1524 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1525 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1527 th->get_message = notify;
1528 th->get_message_cls = notify_cls;
1529 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1530 th->priority = priority;
1531 th->msize = notify_size;
1532 /* bound queue size */
1533 if (pr->queue_size == handle->queue_size)
1535 /* find lowest-priority entry, but skip the head of the list */
1536 minp = pr->pending_head->next;
1538 while (prev != NULL)
1540 if (prev->priority < minp->priority)
1546 GNUNET_break (handle->queue_size != 0);
1547 GNUNET_break (pr->queue_size == 0);
1551 if (priority <= minp->priority)
1554 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1555 "Dropping transmission request: priority too low\n");
1557 return NULL; /* priority too low */
1559 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1564 minp->get_message (minp->get_message_cls,
1569 /* Order entries by deadline, but SKIP 'HEAD' if
1570 we're in the 'ready_peer_*' DLL */
1571 pos = pr->pending_head;
1572 if ( (pr->prev != NULL) ||
1573 (pr->next != NULL) ||
1574 (pr == handle->ready_peer_head) )
1576 GNUNET_assert (pos != NULL);
1577 pos = pos->next; /* skip head */
1580 /* insertion sort */
1582 while ( (pos != NULL) &&
1583 (pos->timeout.abs_value < th->timeout.abs_value) )
1588 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1593 /* was the request queue previously empty? */
1595 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1596 "Transmission request added to queue\n");
1598 if (pr->pending_head == th)
1599 request_next_transmission (pr);
1605 * Cancel the specified transmission-ready notification.
1607 * @param th handle that was returned by "notify_transmit_ready".
1610 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1613 struct PeerRecord *pr = th->peer;
1614 struct GNUNET_CORE_Handle *h = pr->ch;
1617 was_head = (pr->pending_head == th);
1618 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1624 /* we're currently in the control queue, remove */
1625 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1626 h->control_pending_tail,
1628 GNUNET_free (th->cm);
1633 if ( (pr->prev != NULL) ||
1634 (pr->next != NULL) ||
1635 (pr == h->ready_peer_head) )
1637 /* the request that was 'approved' by core was
1638 canceled before it could be transmitted; remove
1639 us from the 'ready' list */
1640 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1644 request_next_transmission (pr);
1649 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1652 * Handle for a request to the core to connect to
1653 * a particular peer. Can be used to cancel the request
1654 * (before the 'cont'inuation is called).
1656 struct GNUNET_CORE_PeerRequestHandle
1660 * Link to control message.
1662 struct ControlMessage *cm;
1667 struct GNUNET_CORE_Handle *h;
1670 * Continuation to run when done.
1672 GNUNET_CORE_ControlContinuation cont;
1675 * Closure for 'cont'.
1683 * Continuation called when the control message was transmitted.
1684 * Calls the original continuation and frees the remaining
1687 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1688 * @param success was the request transmitted?
1691 peer_request_connect_cont (void *cls,
1694 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1696 if (ret->cont != NULL)
1697 ret->cont (ret->cont_cls, success);
1703 * Request that the core should try to connect to a particular peer.
1704 * Once the request has been transmitted to the core, the continuation
1705 * function will be called. Note that this does NOT mean that a
1706 * connection was successfully established -- it only means that the
1707 * core will now try. Successful establishment of the connection
1708 * will be signalled to the 'connects' callback argument of
1709 * 'GNUNET_CORE_connect' only. If the core service does not respond
1710 * to our connection attempt within the given time frame, 'cont' will
1711 * be called with the TIMEOUT reason code.
1713 * @param h core handle
1714 * @param timeout how long to try to talk to core
1715 * @param peer who should we connect to
1716 * @param cont function to call once the request has been completed (or timed out)
1717 * @param cont_cls closure for cont
1718 * @return NULL on error (cont will not be called), otherwise handle for cancellation
1720 struct GNUNET_CORE_PeerRequestHandle *
1721 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1722 struct GNUNET_TIME_Relative timeout,
1723 const struct GNUNET_PeerIdentity * peer,
1724 GNUNET_CORE_ControlContinuation cont,
1727 struct GNUNET_CORE_PeerRequestHandle *ret;
1728 struct ControlMessage *cm;
1729 struct ConnectMessage *msg;
1731 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1732 sizeof (struct ConnectMessage));
1733 msg = (struct ConnectMessage*) &cm[1];
1734 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1735 msg->header.size = htons (sizeof (struct ConnectMessage));
1736 msg->reserved = htonl (0);
1737 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1739 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1740 h->control_pending_tail,
1742 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1746 ret->cont_cls = cont_cls;
1747 cm->cont = &peer_request_connect_cont;
1750 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1751 "Queueing REQUEST_CONNECT request\n");
1753 if (h->control_pending_head == cm)
1754 trigger_next_request (h, GNUNET_NO);
1760 * Cancel a pending request to connect to a particular peer. Must not
1761 * be called after the 'cont' function was invoked.
1763 * @param req request handle that was returned for the original request
1766 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1768 struct GNUNET_CORE_Handle *h = req->h;
1769 struct ControlMessage *cm = req->cm;
1771 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1772 h->control_pending_tail,
1779 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1782 struct GNUNET_CORE_InformationRequestContext
1786 * Our connection to the service.
1788 struct GNUNET_CORE_Handle *h;
1791 * Function to call with the information.
1793 GNUNET_CORE_PeerConfigurationInfoCallback info;
1801 * Link to control message, NULL if CM was sent.
1803 struct ControlMessage *cm;
1806 * Link to peer record.
1808 struct PeerRecord *pr;
1813 * CM was sent, remove link so we don't double-free.
1815 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1816 * @param success were we successful?
1819 change_preference_send_continuation (void *cls,
1822 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1829 * Obtain statistics and/or change preferences for the given peer.
1831 * @param h core handle
1832 * @param peer identifies the peer
1833 * @param timeout after how long should we give up (and call "info" with NULL
1834 * for "peer" to signal an error)?
1835 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1836 * caller should set "bw_out" to "-1" to avoid changing
1837 * the current value; otherwise "bw_out" will be lowered to
1838 * the specified value; passing a pointer to "0" can be used to force
1839 * us to disconnect from the peer; "bw_out" might not increase
1840 * as specified since the upper bound is generally
1841 * determined by the other peer!
1842 * @param amount reserve N bytes for receiving, negative
1843 * amounts can be used to undo a (recent) reservation;
1844 * @param preference increase incoming traffic share preference by this amount;
1845 * in the absence of "amount" reservations, we use this
1846 * preference value to assign proportional bandwidth shares
1847 * to all connected peers
1848 * @param info function to call with the resulting configuration information
1849 * @param info_cls closure for info
1850 * @return NULL on error
1852 struct GNUNET_CORE_InformationRequestContext *
1853 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1854 const struct GNUNET_PeerIdentity *peer,
1855 struct GNUNET_TIME_Relative timeout,
1856 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1858 uint64_t preference,
1859 GNUNET_CORE_PeerConfigurationInfoCallback info,
1862 struct GNUNET_CORE_InformationRequestContext *irc;
1863 struct PeerRecord *pr;
1864 struct RequestInfoMessage *rim;
1865 struct ControlMessage *cm;
1867 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1871 /* attempt to change preference on peer that is not connected */
1875 if (pr->pcic != NULL)
1877 /* second change before first one is done */
1881 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1885 irc->info_cls = info_cls;
1886 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1887 sizeof (struct RequestInfoMessage));
1888 cm->cont = &change_preference_send_continuation;
1891 rim = (struct RequestInfoMessage*) &cm[1];
1892 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1893 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1894 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1895 rim->limit_outbound = bw_out;
1896 rim->reserve_inbound = htonl (amount);
1897 rim->preference_change = GNUNET_htonll(preference);
1900 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1901 "Queueing CHANGE PREFERENCE request\n");
1903 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1904 h->control_pending_tail,
1907 pr->pcic_cls = info_cls;
1908 if (h->control_pending_head == cm)
1909 trigger_next_request (h, GNUNET_NO);
1915 * Cancel request for getting information about a peer.
1916 * Note that an eventual change in preference, trust or bandwidth
1917 * assignment MAY have already been committed at the time,
1918 * so cancelling a request is NOT sure to undo the original
1919 * request. The original request may or may not still commit.
1920 * The only thing cancellation ensures is that the callback
1921 * from the original request will no longer be called.
1923 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1926 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1928 struct GNUNET_CORE_Handle *h = irc->h;
1929 struct PeerRecord *pr = irc->pr;
1931 if (irc->cm != NULL)
1933 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1934 h->control_pending_tail,
1936 GNUNET_free (irc->cm);
1939 pr->pcic_cls = NULL;
1944 /* end of core_api.c */