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.
350 * Is corking allowed?
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 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
469 if (h->client != NULL)
471 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
474 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
475 &disconnect_and_free_peer_entry,
478 while (NULL != (pr = h->ready_peer_head))
479 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
482 h->currently_down = GNUNET_YES;
483 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
486 while (NULL != (cm = h->control_pending_head))
488 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
489 h->control_pending_tail,
493 if (cm->cont != NULL)
494 cm->cont (cm->cont_cls, GNUNET_NO);
497 GNUNET_assert (h->control_pending_head == NULL);
498 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
500 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
505 * Check the list of pending requests, send the next
508 * @param h core handle
509 * @param ignore_currently_down transmit message even if not initialized?
512 trigger_next_request (struct GNUNET_CORE_Handle *h,
513 int ignore_currently_down);
517 * The given request hit its timeout. Remove from the
518 * doubly-linked list and call the respective continuation.
520 * @param cls the transmit handle of the request that timed out
521 * @param tc context, can be NULL (!)
524 transmission_timeout (void *cls,
525 const struct GNUNET_SCHEDULER_TaskContext *tc);
529 * Send a control message to the peer asking for transmission
530 * of the message in the given peer record.
532 * @param pr peer to request transmission to
535 request_next_transmission (struct PeerRecord *pr)
537 struct GNUNET_CORE_Handle *h = pr->ch;
538 struct ControlMessage *cm;
539 struct SendMessageRequest *smr;
540 struct GNUNET_CORE_TransmitHandle *th;
542 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
544 GNUNET_SCHEDULER_cancel (pr->timeout_task);
545 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
547 if (NULL == (th = pr->pending_head))
549 trigger_next_request (h, GNUNET_NO);
553 return; /* already done */
554 GNUNET_assert (pr->prev == NULL);
555 GNUNET_assert (pr->next == NULL);
556 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
557 &transmission_timeout,
559 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
560 sizeof (struct SendMessageRequest));
563 smr = (struct SendMessageRequest*) &cm[1];
564 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
565 smr->header.size = htons (sizeof (struct SendMessageRequest));
566 smr->priority = htonl (th->priority);
567 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
568 smr->peer = pr->peer;
569 smr->queue_size = htonl (pr->queue_size);
570 smr->size = htons (th->msize);
571 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
572 GNUNET_CONTAINER_DLL_insert_after (h->control_pending_head,
573 h->control_pending_tail,
574 h->control_pending_tail,
577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
578 "Adding SEND REQUEST for peer `%s' to message queue\n",
579 GNUNET_i2s (&pr->peer));
581 trigger_next_request (h, GNUNET_NO);
586 * The given request hit its timeout. Remove from the
587 * doubly-linked list and call the respective continuation.
589 * @param cls the transmit handle of the request that timed out
590 * @param tc context, can be NULL (!)
593 transmission_timeout (void *cls,
594 const struct GNUNET_SCHEDULER_TaskContext *tc)
596 struct PeerRecord *pr = cls;
597 struct GNUNET_CORE_Handle *h = pr->ch;
598 struct GNUNET_CORE_TransmitHandle *th;
600 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
601 th = pr->pending_head;
602 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
606 if ( (pr->prev != NULL) ||
607 (pr->next != NULL) ||
608 (pr == h->ready_peer_head) )
610 /* the request that was 'approved' by core was
611 canceled before it could be transmitted; remove
612 us from the 'ready' list */
613 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
618 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
619 "Signalling timeout of request for transmission to CORE service\n");
621 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
622 request_next_transmission (pr);
627 * Transmit the next message to the core service.
630 transmit_message (void *cls,
634 struct GNUNET_CORE_Handle *h = cls;
635 struct ControlMessage *cm;
636 struct GNUNET_CORE_TransmitHandle *th;
637 struct PeerRecord *pr;
638 struct SendMessage *sm;
639 const struct GNUNET_MessageHeader *hdr;
643 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
648 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
649 "Transmission failed, initiating reconnect\n");
654 /* first check for control messages */
655 if (NULL != (cm = h->control_pending_head))
657 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
658 msize = ntohs (hdr->size);
661 trigger_next_request (h, GNUNET_NO);
665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
666 "Transmitting control message with %u bytes of type %u to core.\n",
667 (unsigned int) msize,
668 (unsigned int) ntohs (hdr->type));
670 memcpy (buf, hdr, msize);
671 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
672 h->control_pending_tail,
676 if (NULL != cm->cont)
677 cm->cont (cm->cont_cls, GNUNET_OK);
679 trigger_next_request (h, GNUNET_NO);
682 /* now check for 'ready' P2P messages */
683 if (NULL != (pr = h->ready_peer_head))
685 GNUNET_assert (pr->pending_head != NULL);
686 th = pr->pending_head;
687 if (size < th->msize + sizeof (struct SendMessage))
689 trigger_next_request (h, GNUNET_NO);
692 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
695 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
699 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
701 GNUNET_SCHEDULER_cancel (pr->timeout_task);
702 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
705 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
706 "Transmitting SEND request to `%s' with %u bytes.\n",
707 GNUNET_i2s (&pr->peer),
708 (unsigned int) th->msize);
710 sm = (struct SendMessage *) buf;
711 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
712 sm->priority = htonl (th->priority);
713 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
715 sm->cork = htonl ((uint32_t) th->cork);
716 sm->reserved = htonl (0);
717 ret = th->get_message (th->get_message_cls,
718 size - sizeof (struct SendMessage),
724 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
725 "Size of clients message to peer %s is 0!\n",
726 GNUNET_i2s(&pr->peer));
728 /* client decided to send nothing! */
729 request_next_transmission (pr);
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
734 "Produced SEND message to core with %u bytes payload\n",
737 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
738 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
741 request_next_transmission (pr);
744 ret += sizeof (struct SendMessage);
745 sm->header.size = htons (ret);
746 GNUNET_assert (ret <= size);
748 request_next_transmission (pr);
756 * Check the list of pending requests, send the next
759 * @param h core handle
760 * @param ignore_currently_down transmit message even if not initialized?
763 trigger_next_request (struct GNUNET_CORE_Handle *h,
764 int ignore_currently_down)
768 if ( (GNUNET_YES == h->currently_down) &&
769 (ignore_currently_down == GNUNET_NO) )
772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
773 "Core connection down, not processing queue\n");
780 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
781 "Request pending, not processing queue\n");
785 if (h->control_pending_head != NULL)
786 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
787 else if (h->ready_peer_head != NULL)
788 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
792 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
793 "Request queue empty, not processing queue\n");
795 return; /* no pending message */
797 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
799 GNUNET_TIME_UNIT_FOREVER_REL,
801 &transmit_message, h);
806 * Handler for notification messages received from the core.
808 * @param cls our "struct GNUNET_CORE_Handle"
809 * @param msg the message received from the core service
812 main_notify_handler (void *cls,
813 const struct GNUNET_MessageHeader *msg)
815 struct GNUNET_CORE_Handle *h = cls;
816 const struct InitReplyMessage *m;
817 const struct ConnectNotifyMessage *cnm;
818 const struct DisconnectNotifyMessage *dnm;
819 const struct NotifyTrafficMessage *ntm;
820 const struct GNUNET_MessageHeader *em;
821 const struct ConfigurationInfoMessage *cim;
822 const struct PeerStatusNotifyMessage *psnm;
823 const struct SendMessageReady *smr;
824 const struct GNUNET_CORE_MessageHandler *mh;
825 GNUNET_CORE_StartupCallback init;
826 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
827 struct PeerRecord *pr;
828 struct GNUNET_CORE_TransmitHandle *th;
837 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
839 ("Client was disconnected from core service, trying to reconnect.\n"));
843 msize = ntohs (msg->size);
845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
846 "Processing message of type %u and size %u from core service\n",
847 ntohs (msg->type), msize);
849 switch (ntohs (msg->type))
851 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
852 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
858 m = (const struct InitReplyMessage *) msg;
859 GNUNET_break (0 == ntohl (m->reserved));
860 /* start our message processing loop */
861 if (GNUNET_YES == h->currently_down)
863 h->currently_down = GNUNET_NO;
864 trigger_next_request (h, GNUNET_NO);
866 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
867 GNUNET_CRYPTO_hash (&m->publicKey,
869 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
871 if (NULL != (init = h->init))
873 /* mark so we don't call init on reconnect */
876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
877 "Connected to core service of peer `%s'.\n",
878 GNUNET_i2s (&h->me));
880 init (h->cls, h, &h->me, &m->publicKey);
885 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
886 "Successfully reconnected to core service.\n");
889 /* fake 'connect to self' */
890 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
892 GNUNET_assert (pr == NULL);
893 pr = GNUNET_malloc (sizeof (struct PeerRecord));
896 GNUNET_assert (GNUNET_YES ==
897 GNUNET_CONTAINER_multihashmap_put (h->peers,
900 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
901 if (NULL != h->connects)
906 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
907 if (msize < sizeof (struct ConnectNotifyMessage))
913 cnm = (const struct ConnectNotifyMessage *) msg;
914 ats_count = ntohl (cnm->ats_count);
915 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
916 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
923 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
924 "Received notification about connection from `%s'.\n",
925 GNUNET_i2s (&cnm->peer));
927 if (0 == memcmp (&h->me,
929 sizeof (struct GNUNET_PeerIdentity)))
931 /* connect to self!? */
935 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
936 &cnm->peer.hashPubKey);
943 pr = GNUNET_malloc (sizeof (struct PeerRecord));
944 pr->peer = cnm->peer;
946 GNUNET_assert (GNUNET_YES ==
947 GNUNET_CONTAINER_multihashmap_put (h->peers,
948 &cnm->peer.hashPubKey,
950 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
951 if (NULL != h->connects)
956 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
957 if (msize != sizeof (struct DisconnectNotifyMessage))
963 dnm = (const struct DisconnectNotifyMessage *) msg;
964 if (0 == memcmp (&h->me,
966 sizeof (struct GNUNET_PeerIdentity)))
968 /* connection to self!? */
972 GNUNET_break (0 == ntohl (dnm->reserved));
974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
975 "Received notification about disconnect from `%s'.\n",
976 GNUNET_i2s (&dnm->peer));
978 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
979 &dnm->peer.hashPubKey);
986 trigger = ( (pr->prev != NULL) ||
987 (pr->next != NULL) ||
988 (h->ready_peer_head == pr) );
989 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
991 trigger_next_request (h, GNUNET_NO);
993 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
994 if (NULL == h->status_events)
998 if (msize < sizeof (struct PeerStatusNotifyMessage))
1001 reconnect_later (h);
1004 psnm = (const struct PeerStatusNotifyMessage *) msg;
1005 if (0 == memcmp (&h->me,
1007 sizeof (struct GNUNET_PeerIdentity)))
1013 ats_count = ntohl (psnm->ats_count);
1014 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1015 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1018 reconnect_later (h);
1022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1023 "Received notification about status change by `%s'.\n",
1024 GNUNET_i2s (&psnm->peer));
1026 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1027 &psnm->peer.hashPubKey);
1031 reconnect_later (h);
1034 h->status_events (h->cls,
1037 psnm->bandwidth_out,
1038 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1041 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1042 if (msize < sizeof (struct NotifyTrafficMessage))
1045 reconnect_later (h);
1048 ntm = (const struct NotifyTrafficMessage *) msg;
1050 ats_count = ntohl (ntm->ats_count);
1051 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1052 + sizeof (struct GNUNET_MessageHeader)) ||
1053 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1056 reconnect_later (h);
1059 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1061 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1062 "Received message of type %u and size %u from peer `%4s'\n",
1065 GNUNET_i2s (&ntm->peer));
1067 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1068 &ntm->peer.hashPubKey);
1072 reconnect_later (h);
1075 if ((GNUNET_NO == h->inbound_hdr_only) &&
1076 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1077 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1080 reconnect_later (h);
1083 et = ntohs (em->type);
1084 for (hpos = 0; hpos < h->hcnt; hpos++)
1086 mh = &h->handlers[hpos];
1089 if ((mh->expected_size != ntohs (em->size)) &&
1090 (mh->expected_size != 0))
1096 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1099 /* error in processing, do not process other messages! */
1103 if (NULL != h->inbound_notify)
1104 h->inbound_notify (h->cls, &ntm->peer, em,
1107 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1108 if (msize < sizeof (struct NotifyTrafficMessage))
1111 reconnect_later (h);
1114 ntm = (const struct NotifyTrafficMessage *) msg;
1115 if (0 == memcmp (&h->me,
1117 sizeof (struct GNUNET_PeerIdentity)))
1123 ats_count = ntohl (ntm->ats_count);
1124 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1125 + sizeof (struct GNUNET_MessageHeader)) ||
1126 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1129 reconnect_later (h);
1132 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1133 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1134 &ntm->peer.hashPubKey);
1138 reconnect_later (h);
1142 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1143 "Received notification about transmission to `%s'.\n",
1144 GNUNET_i2s (&ntm->peer));
1146 if ((GNUNET_NO == h->outbound_hdr_only) &&
1147 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1148 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1151 reconnect_later (h);
1154 if (NULL == h->outbound_notify)
1159 h->outbound_notify (h->cls, &ntm->peer, em,
1162 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1163 if (msize != sizeof (struct SendMessageReady))
1166 reconnect_later (h);
1169 smr = (const struct SendMessageReady *) msg;
1170 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1171 &smr->peer.hashPubKey);
1175 reconnect_later (h);
1179 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1180 "Received notification about transmission readiness to `%s'.\n",
1181 GNUNET_i2s (&smr->peer));
1183 if (pr->pending_head == NULL)
1185 /* request must have been cancelled between the original request
1186 and the response from core, ignore core's readiness */
1190 th = pr->pending_head;
1191 if (ntohs (smr->smr_id) != th->smr_id)
1193 /* READY message is for expired or cancelled message,
1194 ignore! (we should have already sent another request) */
1197 if ( (pr->prev != NULL) ||
1198 (pr->next != NULL) ||
1199 (h->ready_peer_head == pr) )
1201 /* we should not already be on the ready list... */
1203 reconnect_later (h);
1206 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1209 trigger_next_request (h, GNUNET_NO);
1211 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1212 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1215 reconnect_later (h);
1218 cim = (const struct ConfigurationInfoMessage*) msg;
1219 if (0 == memcmp (&h->me,
1221 sizeof (struct GNUNET_PeerIdentity)))
1228 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1229 "Received notification about configuration update for `%s'.\n",
1230 GNUNET_i2s (&cim->peer));
1232 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1233 &cim->peer.hashPubKey);
1237 reconnect_later (h);
1240 if (pr->rim_id != ntohl (cim->rim_id))
1243 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1244 "Reservation ID mismatch in notification...\n");
1254 ntohl (cim->reserved_amount),
1255 GNUNET_ntohll (cim->preference));
1258 reconnect_later (h);
1261 GNUNET_CLIENT_receive (h->client,
1262 &main_notify_handler, h,
1263 GNUNET_TIME_UNIT_FOREVER_REL);
1268 * Task executed once we are done transmitting the INIT message.
1269 * Starts our 'receive' loop.
1271 * @param cls the 'struct GNUNET_CORE_Handle'
1272 * @param success were we successful
1275 init_done_task (void *cls,
1278 struct GNUNET_CORE_Handle *h = cls;
1280 if (success == GNUNET_SYSERR)
1281 return; /* shutdown */
1282 if (success == GNUNET_NO)
1285 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1286 "Failed to exchange INIT with core, retrying\n");
1288 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1289 reconnect_later (h);
1292 GNUNET_CLIENT_receive (h->client,
1293 &main_notify_handler,
1295 GNUNET_TIME_UNIT_FOREVER_REL);
1300 * Our current client connection went down. Clean it up
1301 * and try to reconnect!
1303 * @param h our handle to the core service
1306 reconnect (struct GNUNET_CORE_Handle *h)
1308 struct ControlMessage *cm;
1309 struct InitMessage *init;
1316 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1317 "Reconnecting to CORE service\n");
1319 GNUNET_assert (h->client == NULL);
1320 GNUNET_assert (h->currently_down == GNUNET_YES);
1321 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1322 if (h->client == NULL)
1324 reconnect_later (h);
1327 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1328 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1330 cm->cont = &init_done_task;
1332 init = (struct InitMessage*) &cm[1];
1333 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1334 init->header.size = htons (msize);
1335 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1336 if (h->status_events != NULL)
1337 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1338 if (h->inbound_notify != NULL)
1340 if (h->inbound_hdr_only)
1341 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1343 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1345 if (h->outbound_notify != NULL)
1347 if (h->outbound_hdr_only)
1348 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1350 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1352 init->options = htonl (opt);
1353 ts = (uint16_t *) &init[1];
1354 for (hpos = 0; hpos < h->hcnt; hpos++)
1355 ts[hpos] = htons (h->handlers[hpos].type);
1356 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1357 h->control_pending_tail,
1359 trigger_next_request (h, GNUNET_YES);
1365 * Connect to the core service. Note that the connection may
1366 * complete (or fail) asynchronously.
1368 * @param cfg configuration to use
1369 * @param queue_size size of the per-peer message queue
1370 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1371 * @param init callback to call on timeout or once we have successfully
1372 * connected to the core service; note that timeout is only meaningful if init is not NULL
1373 * @param connects function to call on peer connect, can be NULL
1374 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1375 * @param status_events function to call on changes to peer connection status, can be NULL
1376 * @param inbound_notify function to call for all inbound messages, can be NULL
1377 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1378 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1379 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1380 * @param outbound_notify function to call for all outbound messages, can be NULL
1381 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1382 * GNUNET_MessageHeader and hence we do not need to give it the full message
1383 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1384 * @param handlers callbacks for messages we care about, NULL-terminated
1385 * @return handle to the core service (only useful for disconnect until 'init' is called);
1386 * NULL on error (in this case, init is never called)
1388 struct GNUNET_CORE_Handle *
1389 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1390 unsigned int queue_size,
1392 GNUNET_CORE_StartupCallback init,
1393 GNUNET_CORE_ConnectEventHandler connects,
1394 GNUNET_CORE_DisconnectEventHandler disconnects,
1395 GNUNET_CORE_PeerStatusEventHandler status_events,
1396 GNUNET_CORE_MessageCallback inbound_notify,
1397 int inbound_hdr_only,
1398 GNUNET_CORE_MessageCallback outbound_notify,
1399 int outbound_hdr_only,
1400 const struct GNUNET_CORE_MessageHandler *handlers)
1402 struct GNUNET_CORE_Handle *h;
1404 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1406 h->queue_size = queue_size;
1409 h->connects = connects;
1410 h->disconnects = disconnects;
1411 h->status_events = status_events;
1412 h->inbound_notify = inbound_notify;
1413 h->outbound_notify = outbound_notify;
1414 h->inbound_hdr_only = inbound_hdr_only;
1415 h->outbound_hdr_only = outbound_hdr_only;
1416 h->handlers = handlers;
1418 h->currently_down = GNUNET_YES;
1419 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1420 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1421 while (handlers[h->hcnt].callback != NULL)
1423 GNUNET_assert (h->hcnt <
1424 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1425 sizeof (struct InitMessage)) / sizeof (uint16_t));
1427 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1428 "Connecting to CORE service\n");
1436 * Disconnect from the core service. This function can only
1437 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1438 * requests have been explicitly canceled.
1440 * @param handle connection to core to disconnect
1443 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1445 struct ControlMessage *cm;
1448 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1449 "Disconnecting from CORE service\n");
1451 if (handle->cth != NULL)
1453 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1456 if (handle->client != NULL)
1458 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1459 handle->client = NULL;
1461 while (NULL != (cm = handle->control_pending_head))
1463 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1464 handle->control_pending_tail,
1468 if (cm->cont != NULL)
1469 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1472 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1474 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1475 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1477 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1478 &disconnect_and_free_peer_entry,
1480 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1481 GNUNET_break (handle->ready_peer_head == NULL);
1482 GNUNET_free (handle);
1487 * Ask the core to call "notify" once it is ready to transmit the
1488 * given number of bytes to the specified "target". Must only be
1489 * called after a connection to the respective peer has been
1490 * established (and the client has been informed about this).
1492 * @param handle connection to core service
1493 * @param cork is corking allowed for this transmission?
1494 * @param priority how important is the message?
1495 * @param maxdelay how long can the message wait?
1496 * @param target who should receive the message,
1497 * use NULL for this peer (loopback)
1498 * @param notify_size how many bytes of buffer space does notify want?
1499 * @param notify function to call when buffer space is available
1500 * @param notify_cls closure for notify
1501 * @return non-NULL if the notify callback was queued,
1502 * NULL if we can not even queue the request (insufficient
1503 * memory); if NULL is returned, "notify" will NOT be called.
1505 struct GNUNET_CORE_TransmitHandle *
1506 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1509 struct GNUNET_TIME_Relative maxdelay,
1510 const struct GNUNET_PeerIdentity *target,
1512 GNUNET_CONNECTION_TransmitReadyNotify notify,
1515 struct PeerRecord *pr;
1516 struct GNUNET_CORE_TransmitHandle *th;
1517 struct GNUNET_CORE_TransmitHandle *pos;
1518 struct GNUNET_CORE_TransmitHandle *prev;
1519 struct GNUNET_CORE_TransmitHandle *minp;
1521 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1522 &target->hashPubKey);
1525 /* attempt to send to peer that is not connected */
1526 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1527 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1528 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1532 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1533 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1534 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1536 GNUNET_assert(NULL != notify);
1537 th->get_message = notify;
1538 th->get_message_cls = notify_cls;
1539 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1540 th->priority = priority;
1541 th->msize = notify_size;
1543 /* bound queue size */
1544 if (pr->queue_size == handle->queue_size)
1546 /* find lowest-priority entry, but skip the head of the list */
1547 minp = pr->pending_head->next;
1549 while (prev != NULL)
1551 if (prev->priority < minp->priority)
1557 GNUNET_break (handle->queue_size != 0);
1558 GNUNET_break (pr->queue_size == 0);
1562 if (priority <= minp->priority)
1565 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1566 "Dropping transmission request: priority too low\n");
1568 return NULL; /* priority too low */
1570 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1575 minp->get_message (minp->get_message_cls,
1580 /* Order entries by deadline, but SKIP 'HEAD' if
1581 we're in the 'ready_peer_*' DLL */
1582 pos = pr->pending_head;
1583 if ( (pr->prev != NULL) ||
1584 (pr->next != NULL) ||
1585 (pr == handle->ready_peer_head) )
1587 GNUNET_assert (pos != NULL);
1588 pos = pos->next; /* skip head */
1591 /* insertion sort */
1593 while ( (pos != NULL) &&
1594 (pos->timeout.abs_value < th->timeout.abs_value) )
1599 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1604 /* was the request queue previously empty? */
1606 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1607 "Transmission request added to queue\n");
1609 if (pr->pending_head == th)
1610 request_next_transmission (pr);
1616 * Cancel the specified transmission-ready notification.
1618 * @param th handle that was returned by "notify_transmit_ready".
1621 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1624 struct PeerRecord *pr = th->peer;
1625 struct GNUNET_CORE_Handle *h = pr->ch;
1628 was_head = (pr->pending_head == th);
1629 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1635 /* we're currently in the control queue, remove */
1636 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1637 h->control_pending_tail,
1639 GNUNET_free (th->cm);
1644 if ( (pr->prev != NULL) ||
1645 (pr->next != NULL) ||
1646 (pr == h->ready_peer_head) )
1648 /* the request that was 'approved' by core was
1649 canceled before it could be transmitted; remove
1650 us from the 'ready' list */
1651 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1655 request_next_transmission (pr);
1660 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1663 * Handle for a request to the core to connect to
1664 * a particular peer. Can be used to cancel the request
1665 * (before the 'cont'inuation is called).
1667 struct GNUNET_CORE_PeerRequestHandle
1671 * Link to control message.
1673 struct ControlMessage *cm;
1678 struct GNUNET_CORE_Handle *h;
1681 * Continuation to run when done.
1683 GNUNET_CORE_ControlContinuation cont;
1686 * Closure for 'cont'.
1694 * Continuation called when the control message was transmitted.
1695 * Calls the original continuation and frees the remaining
1698 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1699 * @param success was the request transmitted?
1702 peer_request_connect_cont (void *cls,
1705 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1707 if (ret->cont != NULL)
1708 ret->cont (ret->cont_cls, success);
1714 * Request that the core should try to connect to a particular peer.
1715 * Once the request has been transmitted to the core, the continuation
1716 * function will be called. Note that this does NOT mean that a
1717 * connection was successfully established -- it only means that the
1718 * core will now try. Successful establishment of the connection
1719 * will be signalled to the 'connects' callback argument of
1720 * 'GNUNET_CORE_connect' only. If the core service does not respond
1721 * to our connection attempt within the given time frame, 'cont' will
1722 * be called with the TIMEOUT reason code.
1724 * @param h core handle
1725 * @param timeout how long to try to talk to core
1726 * @param peer who should we connect to
1727 * @param cont function to call once the request has been completed (or timed out)
1728 * @param cont_cls closure for cont
1730 * @return NULL on error or already connected,
1731 * otherwise handle for cancellation
1733 struct GNUNET_CORE_PeerRequestHandle *
1734 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1735 struct GNUNET_TIME_Relative timeout,
1736 const struct GNUNET_PeerIdentity * peer,
1737 GNUNET_CORE_ControlContinuation cont,
1740 struct GNUNET_CORE_PeerRequestHandle *ret;
1741 struct ControlMessage *cm;
1742 struct ConnectMessage *msg;
1744 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers,
1748 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Peers are already connected!\n");
1753 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1754 sizeof (struct ConnectMessage));
1755 msg = (struct ConnectMessage*) &cm[1];
1756 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1757 msg->header.size = htons (sizeof (struct ConnectMessage));
1758 msg->reserved = htonl (0);
1759 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1761 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1762 h->control_pending_tail,
1764 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1768 ret->cont_cls = cont_cls;
1769 cm->cont = &peer_request_connect_cont;
1772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1773 "Queueing REQUEST_CONNECT request\n");
1775 if (h->control_pending_head == cm)
1776 trigger_next_request (h, GNUNET_NO);
1782 * Cancel a pending request to connect to a particular peer. Must not
1783 * be called after the 'cont' function was invoked.
1785 * @param req request handle that was returned for the original request
1788 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1790 struct GNUNET_CORE_Handle *h = req->h;
1791 struct ControlMessage *cm = req->cm;
1793 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1794 h->control_pending_tail,
1801 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1804 struct GNUNET_CORE_InformationRequestContext
1808 * Our connection to the service.
1810 struct GNUNET_CORE_Handle *h;
1813 * Function to call with the information.
1815 GNUNET_CORE_PeerConfigurationInfoCallback info;
1823 * Link to control message, NULL if CM was sent.
1825 struct ControlMessage *cm;
1828 * Link to peer record.
1830 struct PeerRecord *pr;
1835 * CM was sent, remove link so we don't double-free.
1837 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1838 * @param success were we successful?
1841 change_preference_send_continuation (void *cls,
1844 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1851 * Obtain statistics and/or change preferences for the given peer.
1853 * @param h core handle
1854 * @param peer identifies the peer
1855 * @param timeout after how long should we give up (and call "info" with NULL
1856 * for "peer" to signal an error)?
1857 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1858 * caller should set "bw_out" to "-1" to avoid changing
1859 * the current value; otherwise "bw_out" will be lowered to
1860 * the specified value; passing a pointer to "0" can be used to force
1861 * us to disconnect from the peer; "bw_out" might not increase
1862 * as specified since the upper bound is generally
1863 * determined by the other peer!
1864 * @param amount reserve N bytes for receiving, negative
1865 * amounts can be used to undo a (recent) reservation;
1866 * @param preference increase incoming traffic share preference by this amount;
1867 * in the absence of "amount" reservations, we use this
1868 * preference value to assign proportional bandwidth shares
1869 * to all connected peers
1870 * @param info function to call with the resulting configuration information
1871 * @param info_cls closure for info
1872 * @return NULL on error
1874 struct GNUNET_CORE_InformationRequestContext *
1875 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1876 const struct GNUNET_PeerIdentity *peer,
1877 struct GNUNET_TIME_Relative timeout,
1878 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1880 uint64_t preference,
1881 GNUNET_CORE_PeerConfigurationInfoCallback info,
1884 struct GNUNET_CORE_InformationRequestContext *irc;
1885 struct PeerRecord *pr;
1886 struct RequestInfoMessage *rim;
1887 struct ControlMessage *cm;
1889 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1893 /* attempt to change preference on peer that is not connected */
1897 if (pr->pcic != NULL)
1899 /* second change before first one is done */
1903 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1907 irc->info_cls = info_cls;
1908 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1909 sizeof (struct RequestInfoMessage));
1910 cm->cont = &change_preference_send_continuation;
1913 rim = (struct RequestInfoMessage*) &cm[1];
1914 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1915 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1916 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1917 rim->limit_outbound = bw_out;
1918 rim->reserve_inbound = htonl (amount);
1919 rim->preference_change = GNUNET_htonll(preference);
1922 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1923 "Queueing CHANGE PREFERENCE request\n");
1925 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1926 h->control_pending_tail,
1929 pr->pcic_cls = info_cls;
1930 if (h->control_pending_head == cm)
1931 trigger_next_request (h, GNUNET_NO);
1937 * Cancel request for getting information about a peer.
1938 * Note that an eventual change in preference, trust or bandwidth
1939 * assignment MAY have already been committed at the time,
1940 * so cancelling a request is NOT sure to undo the original
1941 * request. The original request may or may not still commit.
1942 * The only thing cancellation ensures is that the callback
1943 * from the original request will no longer be called.
1945 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1948 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1950 struct GNUNET_CORE_Handle *h = irc->h;
1951 struct PeerRecord *pr = irc->pr;
1953 if (irc->cm != NULL)
1955 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1956 h->control_pending_tail,
1958 GNUNET_free (irc->cm);
1961 pr->pcic_cls = NULL;
1966 /* end of core_api.c */