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 * Pointer to free when we call pcic.
91 * Request information ID for the given pcic (needed in case a
92 * request is cancelled after being submitted to core and a new
93 * one is generated; in this case, we need to avoid matching the
94 * reply to the first (cancelled) request to the second request).
99 * ID of timeout task for the 'pending_head' handle
100 * which is the one with the smallest timeout.
102 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
105 * Current size of the queue of pending requests.
107 unsigned int queue_size;
110 * SendMessageRequest ID generator for this peer.
118 * Entry in a doubly-linked list of control messages to be transmitted
119 * to the core service. Control messages include traffic allocation,
120 * connection requests and of course our initial 'init' request.
122 * The actual message is allocated at the end of this struct.
124 struct ControlMessage
127 * This is a doubly-linked list.
129 struct ControlMessage *next;
132 * This is a doubly-linked list.
134 struct ControlMessage *prev;
137 * Function to run after transmission failed/succeeded.
139 GNUNET_CORE_ControlContinuation cont;
142 * Closure for 'cont'.
147 * Transmit handle (if one is associated with this ControlMessage), or NULL.
149 struct GNUNET_CORE_TransmitHandle *th;
155 * Context for the core service connection.
157 struct GNUNET_CORE_Handle
161 * Configuration we're using.
163 const struct GNUNET_CONFIGURATION_Handle *cfg;
166 * Closure for the various callbacks.
171 * Function to call once we've handshaked with the core service.
173 GNUNET_CORE_StartupCallback init;
176 * Function to call whenever we're notified about a peer connecting.
178 GNUNET_CORE_ConnectEventHandler connects;
181 * Function to call whenever we're notified about a peer disconnecting.
183 GNUNET_CORE_DisconnectEventHandler disconnects;
186 * Function to call whenever we're notified about a peer changing status.
188 GNUNET_CORE_PeerStatusEventHandler status_events;
191 * Function to call whenever we receive an inbound message.
193 GNUNET_CORE_MessageCallback inbound_notify;
196 * Function to call whenever we receive an outbound message.
198 GNUNET_CORE_MessageCallback outbound_notify;
201 * Function handlers for messages of particular type.
203 const struct GNUNET_CORE_MessageHandler *handlers;
206 * Our connection to the service.
208 struct GNUNET_CLIENT_Connection *client;
211 * Handle for our current transmission request.
213 struct GNUNET_CLIENT_TransmitHandle *cth;
216 * Head of doubly-linked list of pending requests.
218 struct ControlMessage *control_pending_head;
221 * Tail of doubly-linked list of pending requests.
223 struct ControlMessage *control_pending_tail;
226 * Head of doubly-linked list of peers that are core-approved
227 * to send their next message.
229 struct PeerRecord *ready_peer_head;
232 * Tail of doubly-linked list of peers that are core-approved
233 * to send their next message.
235 struct PeerRecord *ready_peer_tail;
238 * Hash map listing all of the peers that we are currently
241 struct GNUNET_CONTAINER_MultiHashMap *peers;
244 * Identity of this peer.
246 struct GNUNET_PeerIdentity me;
249 * ID of reconnect task (if any).
251 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
254 * Current delay we use for re-trying to connect to core.
256 struct GNUNET_TIME_Relative retry_backoff;
259 * Request information ID generator.
264 * Number of messages we are allowed to queue per target.
266 unsigned int queue_size;
269 * Number of entries in the handlers array.
274 * For inbound notifications without a specific handler, do
275 * we expect to only receive headers?
277 int inbound_hdr_only;
280 * For outbound notifications without a specific handler, do
281 * we expect to only receive headers?
283 int outbound_hdr_only;
286 * Are we currently disconnected and hence unable to forward
295 * Handle for a transmission request.
297 struct GNUNET_CORE_TransmitHandle
301 * We keep active transmit handles in a doubly-linked list.
303 struct GNUNET_CORE_TransmitHandle *next;
306 * We keep active transmit handles in a doubly-linked list.
308 struct GNUNET_CORE_TransmitHandle *prev;
311 * Corresponding peer record.
313 struct PeerRecord *peer;
316 * Corresponding SEND_REQUEST message. Only non-NULL
317 * while SEND_REQUEST message is pending.
319 struct ControlMessage *cm;
322 * Function that will be called to get the actual request
323 * (once we are ready to transmit this request to the core).
324 * The function will be called with a NULL buffer to signal
327 GNUNET_CONNECTION_TransmitReadyNotify get_message;
330 * Closure for get_message.
332 void *get_message_cls;
335 * Timeout for this handle.
337 struct GNUNET_TIME_Absolute timeout;
340 * How important is this message?
345 * Size of this request.
350 * Send message request ID for this request.
355 * Is corking allowed?
363 * Our current client connection went down. Clean it up
364 * and try to reconnect!
366 * @param h our handle to the core service
369 reconnect (struct GNUNET_CORE_Handle *h);
373 * Task schedule to try to re-connect to core.
375 * @param cls the 'struct GNUNET_CORE_Handle'
376 * @param tc task context
379 reconnect_task (void *cls,
380 const struct GNUNET_SCHEDULER_TaskContext *tc)
382 struct GNUNET_CORE_Handle *h = cls;
384 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
386 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
387 "Connecting to CORE service after delay\n");
394 * Notify clients about disconnect and free
395 * the entry for connected peer.
397 * @param cls the 'struct GNUNET_CORE_Handle*'
398 * @param key the peer identity (not used)
399 * @param value the 'struct PeerRecord' to free.
400 * @return GNUNET_YES (continue)
403 disconnect_and_free_peer_entry (void *cls,
404 const GNUNET_HashCode *key,
407 static struct GNUNET_BANDWIDTH_Value32NBO zero;
408 struct GNUNET_CORE_Handle *h = cls;
409 struct GNUNET_CORE_TransmitHandle *th;
410 struct PeerRecord *pr = value;
411 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
413 while (NULL != (th = pr->pending_head))
415 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
420 th->get_message (th->get_message_cls,
424 if (NULL != (pcic = pr->pcic))
427 GNUNET_free_non_null (pr->pcic_ptr);
433 GNUNET_TIME_UNIT_FOREVER_REL,
436 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
438 GNUNET_SCHEDULER_cancel (pr->timeout_task);
439 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
441 GNUNET_assert (pr->queue_size == 0);
442 if ( (pr->prev != NULL) ||
443 (pr->next != NULL) ||
444 (h->ready_peer_head == pr) )
445 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
448 if (h->disconnects != NULL)
449 h->disconnects (h->cls,
451 GNUNET_assert (GNUNET_YES ==
452 GNUNET_CONTAINER_multihashmap_remove (h->peers,
455 GNUNET_assert (pr->pending_head == NULL);
456 GNUNET_assert (pr->pending_tail == NULL);
457 GNUNET_assert (pr->ch = h);
458 GNUNET_assert (pr->queue_size == 0);
459 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
466 * Close down any existing connection to the CORE service and
467 * try re-establishing it later.
469 * @param h our handle
472 reconnect_later (struct GNUNET_CORE_Handle *h)
474 struct ControlMessage *cm;
475 struct PeerRecord *pr;
477 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
478 if (h->client != NULL)
480 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
483 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
484 &disconnect_and_free_peer_entry,
487 while (NULL != (pr = h->ready_peer_head))
488 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
491 h->currently_down = GNUNET_YES;
492 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
495 while (NULL != (cm = h->control_pending_head))
497 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
498 h->control_pending_tail,
502 if (cm->cont != NULL)
503 cm->cont (cm->cont_cls, GNUNET_NO);
506 GNUNET_assert (h->control_pending_head == NULL);
507 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
509 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
514 * Check the list of pending requests, send the next
517 * @param h core handle
518 * @param ignore_currently_down transmit message even if not initialized?
521 trigger_next_request (struct GNUNET_CORE_Handle *h,
522 int ignore_currently_down);
526 * The given request hit its timeout. Remove from the
527 * doubly-linked list and call the respective continuation.
529 * @param cls the transmit handle of the request that timed out
530 * @param tc context, can be NULL (!)
533 transmission_timeout (void *cls,
534 const struct GNUNET_SCHEDULER_TaskContext *tc);
538 * Send a control message to the peer asking for transmission
539 * of the message in the given peer record.
541 * @param pr peer to request transmission to
544 request_next_transmission (struct PeerRecord *pr)
546 struct GNUNET_CORE_Handle *h = pr->ch;
547 struct ControlMessage *cm;
548 struct SendMessageRequest *smr;
549 struct GNUNET_CORE_TransmitHandle *th;
551 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
553 GNUNET_SCHEDULER_cancel (pr->timeout_task);
554 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
556 if (NULL == (th = pr->pending_head))
558 trigger_next_request (h, GNUNET_NO);
562 return; /* already done */
563 GNUNET_assert (pr->prev == NULL);
564 GNUNET_assert (pr->next == NULL);
565 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
566 &transmission_timeout,
568 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
569 sizeof (struct SendMessageRequest));
572 smr = (struct SendMessageRequest*) &cm[1];
573 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
574 smr->header.size = htons (sizeof (struct SendMessageRequest));
575 smr->priority = htonl (th->priority);
576 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
577 smr->peer = pr->peer;
578 smr->queue_size = htonl (pr->queue_size);
579 smr->size = htons (th->msize);
580 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
581 GNUNET_CONTAINER_DLL_insert_after (h->control_pending_head,
582 h->control_pending_tail,
583 h->control_pending_tail,
586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
587 "Adding SEND REQUEST for peer `%s' to message queue\n",
588 GNUNET_i2s (&pr->peer));
590 trigger_next_request (h, GNUNET_NO);
595 * The given request hit its timeout. Remove from the
596 * doubly-linked list and call the respective continuation.
598 * @param cls the transmit handle of the request that timed out
599 * @param tc context, can be NULL (!)
602 transmission_timeout (void *cls,
603 const struct GNUNET_SCHEDULER_TaskContext *tc)
605 struct PeerRecord *pr = cls;
606 struct GNUNET_CORE_Handle *h = pr->ch;
607 struct GNUNET_CORE_TransmitHandle *th;
609 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
610 th = pr->pending_head;
611 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
615 if ( (pr->prev != NULL) ||
616 (pr->next != NULL) ||
617 (pr == h->ready_peer_head) )
619 /* the request that was 'approved' by core was
620 canceled before it could be transmitted; remove
621 us from the 'ready' list */
622 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
628 "Signalling timeout of request for transmission to CORE service\n");
630 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
631 request_next_transmission (pr);
636 * Transmit the next message to the core service.
639 transmit_message (void *cls,
643 struct GNUNET_CORE_Handle *h = cls;
644 struct ControlMessage *cm;
645 struct GNUNET_CORE_TransmitHandle *th;
646 struct PeerRecord *pr;
647 struct SendMessage *sm;
648 const struct GNUNET_MessageHeader *hdr;
652 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
657 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
658 "Transmission failed, initiating reconnect\n");
663 /* first check for control messages */
664 if (NULL != (cm = h->control_pending_head))
666 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
667 msize = ntohs (hdr->size);
670 trigger_next_request (h, GNUNET_NO);
674 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
675 "Transmitting control message with %u bytes of type %u to core.\n",
676 (unsigned int) msize,
677 (unsigned int) ntohs (hdr->type));
679 memcpy (buf, hdr, msize);
680 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
681 h->control_pending_tail,
685 if (NULL != cm->cont)
686 cm->cont (cm->cont_cls, GNUNET_OK);
688 trigger_next_request (h, GNUNET_NO);
691 /* now check for 'ready' P2P messages */
692 if (NULL != (pr = h->ready_peer_head))
694 GNUNET_assert (pr->pending_head != NULL);
695 th = pr->pending_head;
696 if (size < th->msize + sizeof (struct SendMessage))
698 trigger_next_request (h, GNUNET_NO);
701 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
704 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
708 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
710 GNUNET_SCHEDULER_cancel (pr->timeout_task);
711 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
714 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
715 "Transmitting SEND request to `%s' with %u bytes.\n",
716 GNUNET_i2s (&pr->peer),
717 (unsigned int) th->msize);
719 sm = (struct SendMessage *) buf;
720 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
721 sm->priority = htonl (th->priority);
722 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
724 sm->cork = htonl ((uint32_t) th->cork);
725 sm->reserved = htonl (0);
726 ret = th->get_message (th->get_message_cls,
727 size - sizeof (struct SendMessage),
733 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
734 "Size of clients message to peer %s is 0!\n",
735 GNUNET_i2s(&pr->peer));
737 /* client decided to send nothing! */
738 request_next_transmission (pr);
743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
744 "Produced SEND message to core with %u bytes payload\n",
747 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
748 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
751 request_next_transmission (pr);
755 ret += sizeof (struct SendMessage);
756 sm->header.size = htons (ret);
757 GNUNET_assert (ret <= size);
759 request_next_transmission (pr);
767 * Check the list of pending requests, send the next
770 * @param h core handle
771 * @param ignore_currently_down transmit message even if not initialized?
774 trigger_next_request (struct GNUNET_CORE_Handle *h,
775 int ignore_currently_down)
779 if ( (GNUNET_YES == h->currently_down) &&
780 (ignore_currently_down == GNUNET_NO) )
783 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
784 "Core connection down, not processing queue\n");
791 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
792 "Request pending, not processing queue\n");
796 if (h->control_pending_head != NULL)
797 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
798 else if (h->ready_peer_head != NULL)
799 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
804 "Request queue empty, not processing queue\n");
806 return; /* no pending message */
808 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
810 GNUNET_TIME_UNIT_FOREVER_REL,
812 &transmit_message, h);
817 * Handler for notification messages received from the core.
819 * @param cls our "struct GNUNET_CORE_Handle"
820 * @param msg the message received from the core service
823 main_notify_handler (void *cls,
824 const struct GNUNET_MessageHeader *msg)
826 struct GNUNET_CORE_Handle *h = cls;
827 const struct InitReplyMessage *m;
828 const struct ConnectNotifyMessage *cnm;
829 const struct DisconnectNotifyMessage *dnm;
830 const struct NotifyTrafficMessage *ntm;
831 const struct GNUNET_MessageHeader *em;
832 const struct ConfigurationInfoMessage *cim;
833 const struct PeerStatusNotifyMessage *psnm;
834 const struct SendMessageReady *smr;
835 const struct GNUNET_CORE_MessageHandler *mh;
836 GNUNET_CORE_StartupCallback init;
837 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
838 struct PeerRecord *pr;
839 struct GNUNET_CORE_TransmitHandle *th;
848 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
850 ("Client was disconnected from core service, trying to reconnect.\n"));
854 msize = ntohs (msg->size);
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
857 "Processing message of type %u and size %u from core service\n",
858 ntohs (msg->type), msize);
860 switch (ntohs (msg->type))
862 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
863 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
869 m = (const struct InitReplyMessage *) msg;
870 GNUNET_break (0 == ntohl (m->reserved));
871 /* start our message processing loop */
872 if (GNUNET_YES == h->currently_down)
874 h->currently_down = GNUNET_NO;
875 trigger_next_request (h, GNUNET_NO);
877 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
878 GNUNET_CRYPTO_hash (&m->publicKey,
880 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
882 if (NULL != (init = h->init))
884 /* mark so we don't call init on reconnect */
887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
888 "Connected to core service of peer `%s'.\n",
889 GNUNET_i2s (&h->me));
891 init (h->cls, h, &h->me, &m->publicKey);
896 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
897 "Successfully reconnected to core service.\n");
900 /* fake 'connect to self' */
901 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
903 GNUNET_assert (pr == NULL);
904 pr = GNUNET_malloc (sizeof (struct PeerRecord));
907 GNUNET_assert (GNUNET_YES ==
908 GNUNET_CONTAINER_multihashmap_put (h->peers,
911 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
912 if (NULL != h->connects)
917 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
918 if (msize < sizeof (struct ConnectNotifyMessage))
924 cnm = (const struct ConnectNotifyMessage *) msg;
925 ats_count = ntohl (cnm->ats_count);
926 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
927 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
934 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
935 "Received notification about connection from `%s'.\n",
936 GNUNET_i2s (&cnm->peer));
938 if (0 == memcmp (&h->me,
940 sizeof (struct GNUNET_PeerIdentity)))
942 /* connect to self!? */
946 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
947 &cnm->peer.hashPubKey);
954 pr = GNUNET_malloc (sizeof (struct PeerRecord));
955 pr->peer = cnm->peer;
957 GNUNET_assert (GNUNET_YES ==
958 GNUNET_CONTAINER_multihashmap_put (h->peers,
959 &cnm->peer.hashPubKey,
961 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
962 if (NULL != h->connects)
967 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
968 if (msize != sizeof (struct DisconnectNotifyMessage))
974 dnm = (const struct DisconnectNotifyMessage *) msg;
975 if (0 == memcmp (&h->me,
977 sizeof (struct GNUNET_PeerIdentity)))
979 /* connection to self!? */
983 GNUNET_break (0 == ntohl (dnm->reserved));
985 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
986 "Received notification about disconnect from `%s'.\n",
987 GNUNET_i2s (&dnm->peer));
989 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
990 &dnm->peer.hashPubKey);
997 trigger = ( (pr->prev != NULL) ||
998 (pr->next != NULL) ||
999 (h->ready_peer_head == pr) );
1000 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
1002 trigger_next_request (h, GNUNET_NO);
1004 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
1005 if (NULL == h->status_events)
1010 if (msize < sizeof (struct PeerStatusNotifyMessage))
1013 reconnect_later (h);
1016 psnm = (const struct PeerStatusNotifyMessage *) msg;
1017 if (0 == memcmp (&h->me,
1019 sizeof (struct GNUNET_PeerIdentity)))
1025 ats_count = ntohl (psnm->ats_count);
1026 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1027 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1030 reconnect_later (h);
1034 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1035 "Received notification about status change by `%s'.\n",
1036 GNUNET_i2s (&psnm->peer));
1038 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1039 &psnm->peer.hashPubKey);
1043 reconnect_later (h);
1046 h->status_events (h->cls,
1049 psnm->bandwidth_out,
1050 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1053 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1054 if (msize < sizeof (struct NotifyTrafficMessage))
1057 reconnect_later (h);
1060 ntm = (const struct NotifyTrafficMessage *) msg;
1062 ats_count = ntohl (ntm->ats_count);
1063 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1064 + sizeof (struct GNUNET_MessageHeader)) ||
1065 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1068 reconnect_later (h);
1071 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1073 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1074 "Received message of type %u and size %u from peer `%4s'\n",
1077 GNUNET_i2s (&ntm->peer));
1079 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1080 &ntm->peer.hashPubKey);
1084 reconnect_later (h);
1087 if ((GNUNET_NO == h->inbound_hdr_only) &&
1088 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1089 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1092 reconnect_later (h);
1095 et = ntohs (em->type);
1096 for (hpos = 0; hpos < h->hcnt; hpos++)
1098 mh = &h->handlers[hpos];
1101 if ((mh->expected_size != ntohs (em->size)) &&
1102 (mh->expected_size != 0))
1108 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1111 /* error in processing, do not process other messages! */
1115 if (NULL != h->inbound_notify)
1116 h->inbound_notify (h->cls, &ntm->peer, em,
1119 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1120 if (msize < sizeof (struct NotifyTrafficMessage))
1123 reconnect_later (h);
1126 ntm = (const struct NotifyTrafficMessage *) msg;
1127 if (0 == memcmp (&h->me,
1129 sizeof (struct GNUNET_PeerIdentity)))
1135 ats_count = ntohl (ntm->ats_count);
1136 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1137 + sizeof (struct GNUNET_MessageHeader)) ||
1138 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1141 reconnect_later (h);
1144 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1145 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1146 &ntm->peer.hashPubKey);
1150 reconnect_later (h);
1154 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1155 "Received notification about transmission to `%s'.\n",
1156 GNUNET_i2s (&ntm->peer));
1158 if ((GNUNET_NO == h->outbound_hdr_only) &&
1159 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1160 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1163 reconnect_later (h);
1166 if (NULL == h->outbound_notify)
1171 h->outbound_notify (h->cls, &ntm->peer, em,
1174 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1175 if (msize != sizeof (struct SendMessageReady))
1178 reconnect_later (h);
1181 smr = (const struct SendMessageReady *) msg;
1182 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1183 &smr->peer.hashPubKey);
1187 reconnect_later (h);
1191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1192 "Received notification about transmission readiness to `%s'.\n",
1193 GNUNET_i2s (&smr->peer));
1195 if (pr->pending_head == NULL)
1197 /* request must have been cancelled between the original request
1198 and the response from core, ignore core's readiness */
1202 th = pr->pending_head;
1203 if (ntohs (smr->smr_id) != th->smr_id)
1205 /* READY message is for expired or cancelled message,
1206 ignore! (we should have already sent another request) */
1209 if ( (pr->prev != NULL) ||
1210 (pr->next != NULL) ||
1211 (h->ready_peer_head == pr) )
1213 /* we should not already be on the ready list... */
1215 reconnect_later (h);
1218 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1221 trigger_next_request (h, GNUNET_NO);
1223 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1224 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1227 reconnect_later (h);
1230 cim = (const struct ConfigurationInfoMessage*) msg;
1231 if (0 == memcmp (&h->me,
1233 sizeof (struct GNUNET_PeerIdentity)))
1240 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1241 "Received notification about configuration update for `%s'.\n",
1242 GNUNET_i2s (&cim->peer));
1244 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1245 &cim->peer.hashPubKey);
1249 reconnect_later (h);
1252 if (pr->rim_id != ntohl (cim->rim_id))
1255 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1256 "Reservation ID mismatch in notification...\n");
1262 GNUNET_free_non_null (pr->pcic_ptr);
1263 pr->pcic_ptr = NULL;
1268 ntohl (cim->reserved_amount),
1269 GNUNET_TIME_relative_ntoh (cim->reserve_delay),
1270 GNUNET_ntohll (cim->preference));
1273 reconnect_later (h);
1276 GNUNET_CLIENT_receive (h->client,
1277 &main_notify_handler, h,
1278 GNUNET_TIME_UNIT_FOREVER_REL);
1283 * Task executed once we are done transmitting the INIT message.
1284 * Starts our 'receive' loop.
1286 * @param cls the 'struct GNUNET_CORE_Handle'
1287 * @param success were we successful
1290 init_done_task (void *cls,
1293 struct GNUNET_CORE_Handle *h = cls;
1295 if (success == GNUNET_SYSERR)
1296 return; /* shutdown */
1297 if (success == GNUNET_NO)
1300 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1301 "Failed to exchange INIT with core, retrying\n");
1303 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1304 reconnect_later (h);
1307 GNUNET_CLIENT_receive (h->client,
1308 &main_notify_handler,
1310 GNUNET_TIME_UNIT_FOREVER_REL);
1315 * Our current client connection went down. Clean it up
1316 * and try to reconnect!
1318 * @param h our handle to the core service
1321 reconnect (struct GNUNET_CORE_Handle *h)
1323 struct ControlMessage *cm;
1324 struct InitMessage *init;
1331 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1332 "Reconnecting to CORE service\n");
1334 GNUNET_assert (h->client == NULL);
1335 GNUNET_assert (h->currently_down == GNUNET_YES);
1336 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1337 if (h->client == NULL)
1339 reconnect_later (h);
1342 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1343 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1345 cm->cont = &init_done_task;
1347 init = (struct InitMessage*) &cm[1];
1348 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1349 init->header.size = htons (msize);
1350 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1351 if (h->status_events != NULL)
1352 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1353 if (h->inbound_notify != NULL)
1355 if (h->inbound_hdr_only)
1356 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1358 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1360 if (h->outbound_notify != NULL)
1362 if (h->outbound_hdr_only)
1363 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1365 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1367 init->options = htonl (opt);
1368 ts = (uint16_t *) &init[1];
1369 for (hpos = 0; hpos < h->hcnt; hpos++)
1370 ts[hpos] = htons (h->handlers[hpos].type);
1371 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1372 h->control_pending_tail,
1374 trigger_next_request (h, GNUNET_YES);
1380 * Connect to the core service. Note that the connection may
1381 * complete (or fail) asynchronously.
1383 * @param cfg configuration to use
1384 * @param queue_size size of the per-peer message queue
1385 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1386 * @param init callback to call on timeout or once we have successfully
1387 * connected to the core service; note that timeout is only meaningful if init is not NULL
1388 * @param connects function to call on peer connect, can be NULL
1389 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1390 * @param status_events function to call on changes to peer connection status, can be NULL
1391 * @param inbound_notify function to call for all inbound messages, can be NULL
1392 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1393 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1394 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1395 * @param outbound_notify function to call for all outbound messages, can be NULL
1396 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1397 * GNUNET_MessageHeader and hence we do not need to give it the full message
1398 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1399 * @param handlers callbacks for messages we care about, NULL-terminated
1400 * @return handle to the core service (only useful for disconnect until 'init' is called);
1401 * NULL on error (in this case, init is never called)
1403 struct GNUNET_CORE_Handle *
1404 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1405 unsigned int queue_size,
1407 GNUNET_CORE_StartupCallback init,
1408 GNUNET_CORE_ConnectEventHandler connects,
1409 GNUNET_CORE_DisconnectEventHandler disconnects,
1410 GNUNET_CORE_PeerStatusEventHandler status_events,
1411 GNUNET_CORE_MessageCallback inbound_notify,
1412 int inbound_hdr_only,
1413 GNUNET_CORE_MessageCallback outbound_notify,
1414 int outbound_hdr_only,
1415 const struct GNUNET_CORE_MessageHandler *handlers)
1417 struct GNUNET_CORE_Handle *h;
1419 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1421 h->queue_size = queue_size;
1424 h->connects = connects;
1425 h->disconnects = disconnects;
1426 h->status_events = status_events;
1427 h->inbound_notify = inbound_notify;
1428 h->outbound_notify = outbound_notify;
1429 h->inbound_hdr_only = inbound_hdr_only;
1430 h->outbound_hdr_only = outbound_hdr_only;
1431 h->handlers = handlers;
1433 h->currently_down = GNUNET_YES;
1434 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1435 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1436 while (handlers[h->hcnt].callback != NULL)
1438 GNUNET_assert (h->hcnt <
1439 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1440 sizeof (struct InitMessage)) / sizeof (uint16_t));
1442 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1443 "Connecting to CORE service\n");
1451 * Disconnect from the core service. This function can only
1452 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1453 * requests have been explicitly canceled.
1455 * @param handle connection to core to disconnect
1458 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1460 struct ControlMessage *cm;
1463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1464 "Disconnecting from CORE service\n");
1466 if (handle->cth != NULL)
1468 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1471 if (handle->client != NULL)
1473 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1474 handle->client = NULL;
1476 while (NULL != (cm = handle->control_pending_head))
1478 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1479 handle->control_pending_tail,
1483 if (cm->cont != NULL)
1484 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1487 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1489 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1490 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1492 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1493 &disconnect_and_free_peer_entry,
1495 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1496 GNUNET_break (handle->ready_peer_head == NULL);
1497 GNUNET_free (handle);
1502 * Ask the core to call "notify" once it is ready to transmit the
1503 * given number of bytes to the specified "target". Must only be
1504 * called after a connection to the respective peer has been
1505 * established (and the client has been informed about this).
1507 * @param handle connection to core service
1508 * @param cork is corking allowed for this transmission?
1509 * @param priority how important is the message?
1510 * @param maxdelay how long can the message wait?
1511 * @param target who should receive the message,
1512 * use NULL for this peer (loopback)
1513 * @param notify_size how many bytes of buffer space does notify want?
1514 * @param notify function to call when buffer space is available
1515 * @param notify_cls closure for notify
1516 * @return non-NULL if the notify callback was queued,
1517 * NULL if we can not even queue the request (insufficient
1518 * memory); if NULL is returned, "notify" will NOT be called.
1520 struct GNUNET_CORE_TransmitHandle *
1521 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1524 struct GNUNET_TIME_Relative maxdelay,
1525 const struct GNUNET_PeerIdentity *target,
1527 GNUNET_CONNECTION_TransmitReadyNotify notify,
1530 struct PeerRecord *pr;
1531 struct GNUNET_CORE_TransmitHandle *th;
1532 struct GNUNET_CORE_TransmitHandle *pos;
1533 struct GNUNET_CORE_TransmitHandle *prev;
1534 struct GNUNET_CORE_TransmitHandle *minp;
1536 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1537 &target->hashPubKey);
1540 /* attempt to send to peer that is not connected */
1541 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1542 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1543 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1547 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1548 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1549 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1551 GNUNET_assert(NULL != notify);
1552 th->get_message = notify;
1553 th->get_message_cls = notify_cls;
1554 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1555 th->priority = priority;
1556 th->msize = notify_size;
1558 /* bound queue size */
1559 if (pr->queue_size == handle->queue_size)
1561 /* find lowest-priority entry, but skip the head of the list */
1562 minp = pr->pending_head->next;
1564 while (prev != NULL)
1566 if (prev->priority < minp->priority)
1572 GNUNET_break (handle->queue_size != 0);
1573 GNUNET_break (pr->queue_size == 1);
1576 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1577 "Dropping transmission request: cannot drop queue head and limit is one\n");
1581 if (priority <= minp->priority)
1584 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1585 "Dropping transmission request: priority too low\n");
1588 return NULL; /* priority too low */
1590 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1595 minp->get_message (minp->get_message_cls,
1600 /* Order entries by deadline, but SKIP 'HEAD' if
1601 we're in the 'ready_peer_*' DLL */
1602 pos = pr->pending_head;
1603 if ( (pr->prev != NULL) ||
1604 (pr->next != NULL) ||
1605 (pr == handle->ready_peer_head) )
1607 GNUNET_assert (pos != NULL);
1608 pos = pos->next; /* skip head */
1611 /* insertion sort */
1613 while ( (pos != NULL) &&
1614 (pos->timeout.abs_value < th->timeout.abs_value) )
1619 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1624 /* was the request queue previously empty? */
1626 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1627 "Transmission request added to queue\n");
1629 if (pr->pending_head == th)
1630 request_next_transmission (pr);
1636 * Cancel the specified transmission-ready notification.
1638 * @param th handle that was returned by "notify_transmit_ready".
1641 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1644 struct PeerRecord *pr = th->peer;
1645 struct GNUNET_CORE_Handle *h = pr->ch;
1648 was_head = (pr->pending_head == th);
1649 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1655 /* we're currently in the control queue, remove */
1656 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1657 h->control_pending_tail,
1659 GNUNET_free (th->cm);
1664 if ( (pr->prev != NULL) ||
1665 (pr->next != NULL) ||
1666 (pr == h->ready_peer_head) )
1668 /* the request that was 'approved' by core was
1669 canceled before it could be transmitted; remove
1670 us from the 'ready' list */
1671 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1675 request_next_transmission (pr);
1680 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1683 * Handle for a request to the core to connect to
1684 * a particular peer. Can be used to cancel the request
1685 * (before the 'cont'inuation is called).
1687 struct GNUNET_CORE_PeerRequestHandle
1691 * Link to control message.
1693 struct ControlMessage *cm;
1698 struct GNUNET_CORE_Handle *h;
1701 * Continuation to run when done.
1703 GNUNET_CORE_ControlContinuation cont;
1706 * Closure for 'cont'.
1714 * Continuation called when the control message was transmitted.
1715 * Calls the original continuation and frees the remaining
1718 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1719 * @param success was the request transmitted?
1722 peer_request_connect_cont (void *cls,
1725 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1727 if (ret->cont != NULL)
1728 ret->cont (ret->cont_cls, success);
1734 * Request that the core should try to connect to a particular peer.
1735 * Once the request has been transmitted to the core, the continuation
1736 * function will be called. Note that this does NOT mean that a
1737 * connection was successfully established -- it only means that the
1738 * core will now try. Successful establishment of the connection
1739 * will be signalled to the 'connects' callback argument of
1740 * 'GNUNET_CORE_connect' only. If the core service does not respond
1741 * to our connection attempt within the given time frame, 'cont' will
1742 * be called with the TIMEOUT reason code.
1744 * @param h core handle
1745 * @param timeout how long to try to talk to core
1746 * @param peer who should we connect to
1747 * @param cont function to call once the request has been completed (or timed out)
1748 * @param cont_cls closure for cont
1750 * @return NULL on error or already connected,
1751 * otherwise handle for cancellation
1753 struct GNUNET_CORE_PeerRequestHandle *
1754 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1755 struct GNUNET_TIME_Relative timeout,
1756 const struct GNUNET_PeerIdentity * peer,
1757 GNUNET_CORE_ControlContinuation cont,
1760 struct GNUNET_CORE_PeerRequestHandle *ret;
1761 struct ControlMessage *cm;
1762 struct ConnectMessage *msg;
1764 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers,
1768 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1769 "Peers are already connected!\n");
1774 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1775 sizeof (struct ConnectMessage));
1776 msg = (struct ConnectMessage*) &cm[1];
1777 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1778 msg->header.size = htons (sizeof (struct ConnectMessage));
1779 msg->reserved = htonl (0);
1780 msg->timeout = GNUNET_TIME_relative_hton (timeout);
1782 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1783 h->control_pending_tail,
1785 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1789 ret->cont_cls = cont_cls;
1790 cm->cont = &peer_request_connect_cont;
1793 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1794 "Queueing REQUEST_CONNECT request\n");
1796 if (h->control_pending_head == cm)
1797 trigger_next_request (h, GNUNET_NO);
1803 * Cancel a pending request to connect to a particular peer. Must not
1804 * be called after the 'cont' function was invoked.
1806 * @param req request handle that was returned for the original request
1809 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1811 struct GNUNET_CORE_Handle *h = req->h;
1812 struct ControlMessage *cm = req->cm;
1814 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1815 h->control_pending_tail,
1822 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1825 struct GNUNET_CORE_InformationRequestContext
1829 * Our connection to the service.
1831 struct GNUNET_CORE_Handle *h;
1834 * Link to control message, NULL if CM was sent.
1836 struct ControlMessage *cm;
1839 * Link to peer record.
1841 struct PeerRecord *pr;
1846 * CM was sent, remove link so we don't double-free.
1848 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1849 * @param success were we successful?
1852 change_preference_send_continuation (void *cls,
1855 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1862 * Obtain statistics and/or change preferences for the given peer.
1864 * @param h core handle
1865 * @param peer identifies the peer
1866 * @param timeout after how long should we give up (and call "info" with NULL
1867 * for "peer" to signal an error)?
1868 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1869 * caller should set "bw_out" to "-1" to avoid changing
1870 * the current value; otherwise "bw_out" will be lowered to
1871 * the specified value; passing a pointer to "0" can be used to force
1872 * us to disconnect from the peer; "bw_out" might not increase
1873 * as specified since the upper bound is generally
1874 * determined by the other peer!
1875 * @param amount reserve N bytes for receiving, negative
1876 * amounts can be used to undo a (recent) reservation;
1877 * @param preference increase incoming traffic share preference by this amount;
1878 * in the absence of "amount" reservations, we use this
1879 * preference value to assign proportional bandwidth shares
1880 * to all connected peers
1881 * @param info function to call with the resulting configuration information
1882 * @param info_cls closure for info
1883 * @return NULL on error
1885 struct GNUNET_CORE_InformationRequestContext *
1886 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1887 const struct GNUNET_PeerIdentity *peer,
1888 struct GNUNET_TIME_Relative timeout,
1889 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1891 uint64_t preference,
1892 GNUNET_CORE_PeerConfigurationInfoCallback info,
1895 struct GNUNET_CORE_InformationRequestContext *irc;
1896 struct PeerRecord *pr;
1897 struct RequestInfoMessage *rim;
1898 struct ControlMessage *cm;
1900 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1904 /* attempt to change preference on peer that is not connected */
1908 if (pr->pcic != NULL)
1910 /* second change before first one is done */
1914 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1917 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1918 sizeof (struct RequestInfoMessage));
1919 cm->cont = &change_preference_send_continuation;
1922 rim = (struct RequestInfoMessage*) &cm[1];
1923 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1924 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1925 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1926 rim->limit_outbound = bw_out;
1927 rim->reserve_inbound = htonl (amount);
1928 rim->preference_change = GNUNET_htonll(preference);
1931 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1932 "Queueing CHANGE PREFERENCE request\n");
1934 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1935 h->control_pending_tail,
1938 pr->pcic_cls = info_cls;
1939 pr->pcic_ptr = irc; /* for free'ing irc */
1940 if (h->control_pending_head == cm)
1941 trigger_next_request (h, GNUNET_NO);
1947 * Cancel request for getting information about a peer.
1948 * Note that an eventual change in preference, trust or bandwidth
1949 * assignment MAY have already been committed at the time,
1950 * so cancelling a request is NOT sure to undo the original
1951 * request. The original request may or may not still commit.
1952 * The only thing cancellation ensures is that the callback
1953 * from the original request will no longer be called.
1955 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1958 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
1960 struct GNUNET_CORE_Handle *h = irc->h;
1961 struct PeerRecord *pr = irc->pr;
1963 GNUNET_assert (pr->pcic_ptr == irc);
1964 if (irc->cm != NULL)
1966 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1967 h->control_pending_tail,
1969 GNUNET_free (irc->cm);
1972 pr->pcic_cls = NULL;
1973 pr->pcic_ptr = NULL;
1978 /* end of core_api.c */