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 and to use to cancel
87 * preference change on disconnect.
89 struct GNUNET_CORE_InformationRequestContext *pcic_ptr;
92 * Request information ID for the given pcic (needed in case a
93 * request is cancelled after being submitted to core and a new
94 * one is generated; in this case, we need to avoid matching the
95 * reply to the first (cancelled) request to the second request).
100 * ID of timeout task for the 'pending_head' handle
101 * which is the one with the smallest timeout.
103 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
106 * ID of task to run 'next_request_transmission'.
108 GNUNET_SCHEDULER_TaskIdentifier ntr_task;
111 * Current size of the queue of pending requests.
113 unsigned int queue_size;
116 * SendMessageRequest ID generator for this peer.
124 * Entry in a doubly-linked list of control messages to be transmitted
125 * to the core service. Control messages include traffic allocation,
126 * connection requests and of course our initial 'init' request.
128 * The actual message is allocated at the end of this struct.
130 struct ControlMessage
133 * This is a doubly-linked list.
135 struct ControlMessage *next;
138 * This is a doubly-linked list.
140 struct ControlMessage *prev;
143 * Function to run after transmission failed/succeeded.
145 GNUNET_CORE_ControlContinuation cont;
148 * Closure for 'cont'.
153 * Transmit handle (if one is associated with this ControlMessage), or NULL.
155 struct GNUNET_CORE_TransmitHandle *th;
161 * Context for the core service connection.
163 struct GNUNET_CORE_Handle
167 * Configuration we're using.
169 const struct GNUNET_CONFIGURATION_Handle *cfg;
172 * Closure for the various callbacks.
177 * Function to call once we've handshaked with the core service.
179 GNUNET_CORE_StartupCallback init;
182 * Function to call whenever we're notified about a peer connecting.
184 GNUNET_CORE_ConnectEventHandler connects;
187 * Function to call whenever we're notified about a peer disconnecting.
189 GNUNET_CORE_DisconnectEventHandler disconnects;
192 * Function to call whenever we're notified about a peer changing status.
194 GNUNET_CORE_PeerStatusEventHandler status_events;
197 * Function to call whenever we receive an inbound message.
199 GNUNET_CORE_MessageCallback inbound_notify;
202 * Function to call whenever we receive an outbound message.
204 GNUNET_CORE_MessageCallback outbound_notify;
207 * Function handlers for messages of particular type.
209 const struct GNUNET_CORE_MessageHandler *handlers;
212 * Our connection to the service.
214 struct GNUNET_CLIENT_Connection *client;
217 * Handle for our current transmission request.
219 struct GNUNET_CLIENT_TransmitHandle *cth;
222 * Head of doubly-linked list of pending requests.
224 struct ControlMessage *control_pending_head;
227 * Tail of doubly-linked list of pending requests.
229 struct ControlMessage *control_pending_tail;
232 * Head of doubly-linked list of peers that are core-approved
233 * to send their next message.
235 struct PeerRecord *ready_peer_head;
238 * Tail of doubly-linked list of peers that are core-approved
239 * to send their next message.
241 struct PeerRecord *ready_peer_tail;
244 * Hash map listing all of the peers that we are currently
247 struct GNUNET_CONTAINER_MultiHashMap *peers;
250 * Identity of this peer.
252 struct GNUNET_PeerIdentity me;
255 * ID of reconnect task (if any).
257 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
260 * Current delay we use for re-trying to connect to core.
262 struct GNUNET_TIME_Relative retry_backoff;
265 * Request information ID generator.
270 * Number of messages we are allowed to queue per target.
272 unsigned int queue_size;
275 * Number of entries in the handlers array.
280 * For inbound notifications without a specific handler, do
281 * we expect to only receive headers?
283 int inbound_hdr_only;
286 * For outbound notifications without a specific handler, do
287 * we expect to only receive headers?
289 int outbound_hdr_only;
292 * Are we currently disconnected and hence unable to forward
301 * Handle for a transmission request.
303 struct GNUNET_CORE_TransmitHandle
307 * We keep active transmit handles in a doubly-linked list.
309 struct GNUNET_CORE_TransmitHandle *next;
312 * We keep active transmit handles in a doubly-linked list.
314 struct GNUNET_CORE_TransmitHandle *prev;
317 * Corresponding peer record.
319 struct PeerRecord *peer;
322 * Corresponding SEND_REQUEST message. Only non-NULL
323 * while SEND_REQUEST message is pending.
325 struct ControlMessage *cm;
328 * Function that will be called to get the actual request
329 * (once we are ready to transmit this request to the core).
330 * The function will be called with a NULL buffer to signal
333 GNUNET_CONNECTION_TransmitReadyNotify get_message;
336 * Closure for get_message.
338 void *get_message_cls;
341 * Timeout for this handle.
343 struct GNUNET_TIME_Absolute timeout;
346 * How important is this message?
351 * Size of this request.
356 * Send message request ID for this request.
361 * Is corking allowed?
369 * Our current client connection went down. Clean it up
370 * and try to reconnect!
372 * @param h our handle to the core service
375 reconnect (struct GNUNET_CORE_Handle *h);
379 * Task schedule to try to re-connect to core.
381 * @param cls the 'struct GNUNET_CORE_Handle'
382 * @param tc task context
385 reconnect_task (void *cls,
386 const struct GNUNET_SCHEDULER_TaskContext *tc)
388 struct GNUNET_CORE_Handle *h = cls;
390 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
392 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
393 "Connecting to CORE service after delay\n");
400 * Notify clients about disconnect and free
401 * the entry for connected peer.
403 * @param cls the 'struct GNUNET_CORE_Handle*'
404 * @param key the peer identity (not used)
405 * @param value the 'struct PeerRecord' to free.
406 * @return GNUNET_YES (continue)
409 disconnect_and_free_peer_entry (void *cls,
410 const GNUNET_HashCode *key,
413 static struct GNUNET_BANDWIDTH_Value32NBO zero;
414 struct GNUNET_CORE_Handle *h = cls;
415 struct GNUNET_CORE_TransmitHandle *th;
416 struct PeerRecord *pr = value;
417 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
420 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
422 GNUNET_SCHEDULER_cancel (pr->timeout_task);
423 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
425 if (pr->ntr_task != GNUNET_SCHEDULER_NO_TASK)
427 GNUNET_SCHEDULER_cancel (pr->ntr_task);
428 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
430 if ( (pr->prev != NULL) ||
431 (pr->next != NULL) ||
432 (h->ready_peer_head == pr) )
433 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
436 if (h->disconnects != NULL)
437 h->disconnects (h->cls,
439 /* all requests should have been cancelled, clean up anyway, just in case */
440 GNUNET_break (pr->queue_size == 0);
441 if (NULL != (pcic = pr->pcic))
444 pcic_cls = pr->pcic_cls;
445 GNUNET_CORE_peer_change_preference_cancel (pr->pcic_ptr);
450 GNUNET_TIME_UNIT_FOREVER_REL,
453 while (NULL != (th = pr->pending_head))
456 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
464 /* done with 'voluntary' cleanups, now on to normal freeing */
465 GNUNET_assert (GNUNET_YES ==
466 GNUNET_CONTAINER_multihashmap_remove (h->peers,
469 GNUNET_assert (pr->pending_head == NULL);
470 GNUNET_assert (pr->pending_tail == NULL);
471 GNUNET_assert (pr->ch = h);
472 GNUNET_assert (pr->queue_size == 0);
473 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
474 GNUNET_assert (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK);
481 * Close down any existing connection to the CORE service and
482 * try re-establishing it later.
484 * @param h our handle
487 reconnect_later (struct GNUNET_CORE_Handle *h)
489 struct ControlMessage *cm;
490 struct PeerRecord *pr;
492 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
495 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
498 if (h->client != NULL)
500 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
503 h->currently_down = GNUNET_YES;
504 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
505 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
508 while (NULL != (cm = h->control_pending_head))
510 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
511 h->control_pending_tail,
515 if (cm->cont != NULL)
516 cm->cont (cm->cont_cls, GNUNET_NO);
519 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
520 &disconnect_and_free_peer_entry,
522 while (NULL != (pr = h->ready_peer_head))
523 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
526 GNUNET_assert (h->control_pending_head == NULL);
527 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
529 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
534 * Check the list of pending requests, send the next
537 * @param h core handle
538 * @param ignore_currently_down transmit message even if not initialized?
541 trigger_next_request (struct GNUNET_CORE_Handle *h,
542 int ignore_currently_down);
546 * The given request hit its timeout. Remove from the
547 * doubly-linked list and call the respective continuation.
549 * @param cls the transmit handle of the request that timed out
550 * @param tc context, can be NULL (!)
553 transmission_timeout (void *cls,
554 const struct GNUNET_SCHEDULER_TaskContext *tc);
558 * Send a control message to the peer asking for transmission
559 * of the message in the given peer record.
561 * @param pr peer to request transmission to
564 request_next_transmission (struct PeerRecord *pr)
566 struct GNUNET_CORE_Handle *h = pr->ch;
567 struct ControlMessage *cm;
568 struct SendMessageRequest *smr;
569 struct GNUNET_CORE_TransmitHandle *th;
571 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
573 GNUNET_SCHEDULER_cancel (pr->timeout_task);
574 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
576 if (NULL == (th = pr->pending_head))
578 trigger_next_request (h, GNUNET_NO);
582 return; /* already done */
583 GNUNET_assert (pr->prev == NULL);
584 GNUNET_assert (pr->next == NULL);
585 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
586 &transmission_timeout,
588 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
589 sizeof (struct SendMessageRequest));
592 smr = (struct SendMessageRequest*) &cm[1];
593 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
594 smr->header.size = htons (sizeof (struct SendMessageRequest));
595 smr->priority = htonl (th->priority);
596 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
597 smr->peer = pr->peer;
598 smr->queue_size = htonl (pr->queue_size);
599 smr->size = htons (th->msize);
600 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
601 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
602 h->control_pending_tail,
605 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
606 "Adding SEND REQUEST for peer `%s' to message queue\n",
607 GNUNET_i2s (&pr->peer));
609 trigger_next_request (h, GNUNET_NO);
614 * The given request hit its timeout. Remove from the
615 * doubly-linked list and call the respective continuation.
617 * @param cls the transmit handle of the request that timed out
618 * @param tc context, can be NULL (!)
621 transmission_timeout (void *cls,
622 const struct GNUNET_SCHEDULER_TaskContext *tc)
624 struct PeerRecord *pr = cls;
625 struct GNUNET_CORE_Handle *h = pr->ch;
626 struct GNUNET_CORE_TransmitHandle *th;
628 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
629 th = pr->pending_head;
630 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
634 if ( (pr->prev != NULL) ||
635 (pr->next != NULL) ||
636 (pr == h->ready_peer_head) )
638 /* the request that was 'approved' by core was
639 canceled before it could be transmitted; remove
640 us from the 'ready' list */
641 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
647 "Signalling timeout of request for transmission to CORE service\n");
649 request_next_transmission (pr);
650 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
656 * Transmit the next message to the core service.
659 transmit_message (void *cls,
663 struct GNUNET_CORE_Handle *h = cls;
664 struct ControlMessage *cm;
665 struct GNUNET_CORE_TransmitHandle *th;
666 struct PeerRecord *pr;
667 struct SendMessage *sm;
668 const struct GNUNET_MessageHeader *hdr;
672 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
677 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
678 "Transmission failed, initiating reconnect\n");
683 /* first check for control messages */
684 if (NULL != (cm = h->control_pending_head))
686 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
687 msize = ntohs (hdr->size);
690 trigger_next_request (h, GNUNET_NO);
694 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
695 "Transmitting control message with %u bytes of type %u to core.\n",
696 (unsigned int) msize,
697 (unsigned int) ntohs (hdr->type));
699 memcpy (buf, hdr, msize);
700 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
701 h->control_pending_tail,
705 if (NULL != cm->cont)
706 cm->cont (cm->cont_cls, GNUNET_OK);
708 trigger_next_request (h, GNUNET_NO);
711 /* now check for 'ready' P2P messages */
712 if (NULL != (pr = h->ready_peer_head))
714 GNUNET_assert (pr->pending_head != NULL);
715 th = pr->pending_head;
716 if (size < th->msize + sizeof (struct SendMessage))
718 trigger_next_request (h, GNUNET_NO);
721 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
724 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
728 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
730 GNUNET_SCHEDULER_cancel (pr->timeout_task);
731 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
734 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
735 "Transmitting SEND request to `%s' with %u bytes.\n",
736 GNUNET_i2s (&pr->peer),
737 (unsigned int) th->msize);
739 sm = (struct SendMessage *) buf;
740 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
741 sm->priority = htonl (th->priority);
742 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
744 sm->cork = htonl ((uint32_t) th->cork);
745 sm->reserved = htonl (0);
746 ret = th->get_message (th->get_message_cls,
747 size - sizeof (struct SendMessage),
751 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
752 "Transmitting SEND request to `%s' yielded %u bytes.\n",
753 GNUNET_i2s (&pr->peer),
760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
761 "Size of clients message to peer %s is 0!\n",
762 GNUNET_i2s(&pr->peer));
764 /* client decided to send nothing! */
765 request_next_transmission (pr);
769 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
770 "Produced SEND message to core with %u bytes payload\n",
773 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
774 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
777 request_next_transmission (pr);
780 ret += sizeof (struct SendMessage);
781 sm->header.size = htons (ret);
782 GNUNET_assert (ret <= size);
783 request_next_transmission (pr);
791 * Check the list of pending requests, send the next
794 * @param h core handle
795 * @param ignore_currently_down transmit message even if not initialized?
798 trigger_next_request (struct GNUNET_CORE_Handle *h,
799 int ignore_currently_down)
803 if ( (GNUNET_YES == h->currently_down) &&
804 (ignore_currently_down == GNUNET_NO) )
807 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
808 "Core connection down, not processing queue\n");
815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
816 "Request pending, not processing queue\n");
820 if (h->control_pending_head != NULL)
821 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
822 else if (h->ready_peer_head != NULL)
823 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
827 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
828 "Request queue empty, not processing queue\n");
830 return; /* no pending message */
832 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
834 GNUNET_TIME_UNIT_FOREVER_REL,
836 &transmit_message, h);
841 * Handler for notification messages received from the core.
843 * @param cls our "struct GNUNET_CORE_Handle"
844 * @param msg the message received from the core service
847 main_notify_handler (void *cls,
848 const struct GNUNET_MessageHeader *msg)
850 struct GNUNET_CORE_Handle *h = cls;
851 const struct InitReplyMessage *m;
852 const struct ConnectNotifyMessage *cnm;
853 const struct DisconnectNotifyMessage *dnm;
854 const struct NotifyTrafficMessage *ntm;
855 const struct GNUNET_MessageHeader *em;
856 const struct ConfigurationInfoMessage *cim;
857 const struct PeerStatusNotifyMessage *psnm;
858 const struct SendMessageReady *smr;
859 const struct GNUNET_CORE_MessageHandler *mh;
860 GNUNET_CORE_StartupCallback init;
861 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
862 struct PeerRecord *pr;
863 struct GNUNET_CORE_TransmitHandle *th;
872 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
874 ("Client was disconnected from core service, trying to reconnect.\n"));
878 msize = ntohs (msg->size);
880 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
881 "Processing message of type %u and size %u from core service\n",
882 ntohs (msg->type), msize);
884 switch (ntohs (msg->type))
886 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
887 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
893 m = (const struct InitReplyMessage *) msg;
894 GNUNET_break (0 == ntohl (m->reserved));
895 /* start our message processing loop */
896 if (GNUNET_YES == h->currently_down)
898 h->currently_down = GNUNET_NO;
899 trigger_next_request (h, GNUNET_NO);
901 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
902 GNUNET_CRYPTO_hash (&m->publicKey,
904 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
906 if (NULL != (init = h->init))
908 /* mark so we don't call init on reconnect */
911 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
912 "Connected to core service of peer `%s'.\n",
913 GNUNET_i2s (&h->me));
915 init (h->cls, h, &h->me, &m->publicKey);
920 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
921 "Successfully reconnected to core service.\n");
924 /* fake 'connect to self' */
925 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
927 GNUNET_assert (pr == NULL);
928 pr = GNUNET_malloc (sizeof (struct PeerRecord));
931 GNUNET_assert (GNUNET_YES ==
932 GNUNET_CONTAINER_multihashmap_put (h->peers,
935 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
936 if (NULL != h->connects)
941 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
942 if (msize < sizeof (struct ConnectNotifyMessage))
948 cnm = (const struct ConnectNotifyMessage *) msg;
949 ats_count = ntohl (cnm->ats_count);
950 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
951 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
958 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
959 "Received notification about connection from `%s'.\n",
960 GNUNET_i2s (&cnm->peer));
962 if (0 == memcmp (&h->me,
964 sizeof (struct GNUNET_PeerIdentity)))
966 /* connect to self!? */
970 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
971 &cnm->peer.hashPubKey);
978 pr = GNUNET_malloc (sizeof (struct PeerRecord));
979 pr->peer = cnm->peer;
981 GNUNET_assert (GNUNET_YES ==
982 GNUNET_CONTAINER_multihashmap_put (h->peers,
983 &cnm->peer.hashPubKey,
985 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
986 if (NULL != h->connects)
991 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
992 if (msize != sizeof (struct DisconnectNotifyMessage))
998 dnm = (const struct DisconnectNotifyMessage *) msg;
999 if (0 == memcmp (&h->me,
1001 sizeof (struct GNUNET_PeerIdentity)))
1003 /* connection to self!? */
1007 GNUNET_break (0 == ntohl (dnm->reserved));
1009 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1010 "Received notification about disconnect from `%s'.\n",
1011 GNUNET_i2s (&dnm->peer));
1013 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1014 &dnm->peer.hashPubKey);
1018 reconnect_later (h);
1021 trigger = ( (pr->prev != NULL) ||
1022 (pr->next != NULL) ||
1023 (h->ready_peer_head == pr) );
1024 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
1026 trigger_next_request (h, GNUNET_NO);
1028 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
1029 if (NULL == h->status_events)
1034 if (msize < sizeof (struct PeerStatusNotifyMessage))
1037 reconnect_later (h);
1040 psnm = (const struct PeerStatusNotifyMessage *) msg;
1041 if (0 == memcmp (&h->me,
1043 sizeof (struct GNUNET_PeerIdentity)))
1049 ats_count = ntohl (psnm->ats_count);
1050 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1051 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1054 reconnect_later (h);
1058 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1059 "Received notification about status change by `%s'.\n",
1060 GNUNET_i2s (&psnm->peer));
1062 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1063 &psnm->peer.hashPubKey);
1067 reconnect_later (h);
1070 h->status_events (h->cls,
1073 psnm->bandwidth_out,
1074 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1077 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1078 if (msize < sizeof (struct NotifyTrafficMessage))
1081 reconnect_later (h);
1084 ntm = (const struct NotifyTrafficMessage *) msg;
1086 ats_count = ntohl (ntm->ats_count);
1087 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1088 + sizeof (struct GNUNET_MessageHeader)) ||
1089 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1092 reconnect_later (h);
1095 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1097 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1098 "Received message of type %u and size %u from peer `%4s'\n",
1101 GNUNET_i2s (&ntm->peer));
1103 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1104 &ntm->peer.hashPubKey);
1108 reconnect_later (h);
1111 if ((GNUNET_NO == h->inbound_hdr_only) &&
1112 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1113 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1116 reconnect_later (h);
1119 et = ntohs (em->type);
1120 for (hpos = 0; hpos < h->hcnt; hpos++)
1122 mh = &h->handlers[hpos];
1125 if ((mh->expected_size != ntohs (em->size)) &&
1126 (mh->expected_size != 0))
1132 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1135 /* error in processing, do not process other messages! */
1139 if (NULL != h->inbound_notify)
1140 h->inbound_notify (h->cls, &ntm->peer, em,
1143 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1144 if (msize < sizeof (struct NotifyTrafficMessage))
1147 reconnect_later (h);
1150 ntm = (const struct NotifyTrafficMessage *) msg;
1151 if (0 == memcmp (&h->me,
1153 sizeof (struct GNUNET_PeerIdentity)))
1159 ats_count = ntohl (ntm->ats_count);
1160 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1161 + sizeof (struct GNUNET_MessageHeader)) ||
1162 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1165 reconnect_later (h);
1168 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1169 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1170 &ntm->peer.hashPubKey);
1174 reconnect_later (h);
1178 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1179 "Received notification about transmission to `%s'.\n",
1180 GNUNET_i2s (&ntm->peer));
1182 if ((GNUNET_NO == h->outbound_hdr_only) &&
1183 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1184 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1187 reconnect_later (h);
1190 if (NULL == h->outbound_notify)
1195 h->outbound_notify (h->cls, &ntm->peer, em,
1198 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1199 if (msize != sizeof (struct SendMessageReady))
1202 reconnect_later (h);
1205 smr = (const struct SendMessageReady *) msg;
1206 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1207 &smr->peer.hashPubKey);
1211 reconnect_later (h);
1215 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1216 "Received notification about transmission readiness to `%s'.\n",
1217 GNUNET_i2s (&smr->peer));
1219 if (pr->pending_head == NULL)
1221 /* request must have been cancelled between the original request
1222 and the response from core, ignore core's readiness */
1226 th = pr->pending_head;
1227 if (ntohs (smr->smr_id) != th->smr_id)
1229 /* READY message is for expired or cancelled message,
1230 ignore! (we should have already sent another request) */
1233 if ( (pr->prev != NULL) ||
1234 (pr->next != NULL) ||
1235 (h->ready_peer_head == pr) )
1237 /* we should not already be on the ready list... */
1239 reconnect_later (h);
1242 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1245 trigger_next_request (h, GNUNET_NO);
1247 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1248 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1251 reconnect_later (h);
1254 cim = (const struct ConfigurationInfoMessage*) msg;
1255 if (0 == memcmp (&h->me,
1257 sizeof (struct GNUNET_PeerIdentity)))
1264 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1265 "Received notification about configuration update for `%s' with RIM %u.\n",
1266 GNUNET_i2s (&cim->peer),
1267 (unsigned int) ntohl (cim->rim_id));
1269 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1270 &cim->peer.hashPubKey);
1274 reconnect_later (h);
1277 if (pr->rim_id != ntohl (cim->rim_id))
1280 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1281 "Reservation ID mismatch in notification...\n");
1287 GNUNET_free_non_null (pr->pcic_ptr);
1288 pr->pcic_ptr = NULL;
1293 ntohl (cim->reserved_amount),
1294 GNUNET_TIME_relative_ntoh (cim->reserve_delay),
1295 GNUNET_ntohll (cim->preference));
1298 reconnect_later (h);
1301 GNUNET_CLIENT_receive (h->client,
1302 &main_notify_handler, h,
1303 GNUNET_TIME_UNIT_FOREVER_REL);
1308 * Task executed once we are done transmitting the INIT message.
1309 * Starts our 'receive' loop.
1311 * @param cls the 'struct GNUNET_CORE_Handle'
1312 * @param success were we successful
1315 init_done_task (void *cls,
1318 struct GNUNET_CORE_Handle *h = cls;
1320 if (success == GNUNET_SYSERR)
1321 return; /* shutdown */
1322 if (success == GNUNET_NO)
1325 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1326 "Failed to exchange INIT with core, retrying\n");
1328 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1329 reconnect_later (h);
1332 GNUNET_CLIENT_receive (h->client,
1333 &main_notify_handler,
1335 GNUNET_TIME_UNIT_FOREVER_REL);
1340 * Our current client connection went down. Clean it up
1341 * and try to reconnect!
1343 * @param h our handle to the core service
1346 reconnect (struct GNUNET_CORE_Handle *h)
1348 struct ControlMessage *cm;
1349 struct InitMessage *init;
1356 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1357 "Reconnecting to CORE service\n");
1359 GNUNET_assert (h->client == NULL);
1360 GNUNET_assert (h->currently_down == GNUNET_YES);
1361 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1362 if (h->client == NULL)
1364 reconnect_later (h);
1367 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1368 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1370 cm->cont = &init_done_task;
1372 init = (struct InitMessage*) &cm[1];
1373 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1374 init->header.size = htons (msize);
1375 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1376 if (h->status_events != NULL)
1377 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1378 if (h->inbound_notify != NULL)
1380 if (h->inbound_hdr_only)
1381 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1383 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1385 if (h->outbound_notify != NULL)
1387 if (h->outbound_hdr_only)
1388 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1390 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1392 init->options = htonl (opt);
1393 ts = (uint16_t *) &init[1];
1394 for (hpos = 0; hpos < h->hcnt; hpos++)
1395 ts[hpos] = htons (h->handlers[hpos].type);
1396 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1397 h->control_pending_tail,
1399 trigger_next_request (h, GNUNET_YES);
1405 * Connect to the core service. Note that the connection may
1406 * complete (or fail) asynchronously.
1408 * @param cfg configuration to use
1409 * @param queue_size size of the per-peer message queue
1410 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1411 * @param init callback to call on timeout or once we have successfully
1412 * connected to the core service; note that timeout is only meaningful if init is not NULL
1413 * @param connects function to call on peer connect, can be NULL
1414 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1415 * @param status_events function to call on changes to peer connection status, can be NULL
1416 * @param inbound_notify function to call for all inbound messages, can be NULL
1417 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1418 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1419 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1420 * @param outbound_notify function to call for all outbound messages, can be NULL
1421 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1422 * GNUNET_MessageHeader and hence we do not need to give it the full message
1423 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1424 * @param handlers callbacks for messages we care about, NULL-terminated
1425 * @return handle to the core service (only useful for disconnect until 'init' is called);
1426 * NULL on error (in this case, init is never called)
1428 struct GNUNET_CORE_Handle *
1429 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1430 unsigned int queue_size,
1432 GNUNET_CORE_StartupCallback init,
1433 GNUNET_CORE_ConnectEventHandler connects,
1434 GNUNET_CORE_DisconnectEventHandler disconnects,
1435 GNUNET_CORE_PeerStatusEventHandler status_events,
1436 GNUNET_CORE_MessageCallback inbound_notify,
1437 int inbound_hdr_only,
1438 GNUNET_CORE_MessageCallback outbound_notify,
1439 int outbound_hdr_only,
1440 const struct GNUNET_CORE_MessageHandler *handlers)
1442 struct GNUNET_CORE_Handle *h;
1444 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1446 h->queue_size = queue_size;
1449 h->connects = connects;
1450 h->disconnects = disconnects;
1451 h->status_events = status_events;
1452 h->inbound_notify = inbound_notify;
1453 h->outbound_notify = outbound_notify;
1454 h->inbound_hdr_only = inbound_hdr_only;
1455 h->outbound_hdr_only = outbound_hdr_only;
1456 h->handlers = handlers;
1458 h->currently_down = GNUNET_YES;
1459 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1460 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1461 while (handlers[h->hcnt].callback != NULL)
1463 GNUNET_assert (h->hcnt <
1464 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1465 sizeof (struct InitMessage)) / sizeof (uint16_t));
1467 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1468 "Connecting to CORE service\n");
1476 * Disconnect from the core service. This function can only
1477 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1478 * requests have been explicitly canceled.
1480 * @param handle connection to core to disconnect
1483 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1485 struct ControlMessage *cm;
1488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1489 "Disconnecting from CORE service\n");
1491 if (handle->cth != NULL)
1493 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1496 while (NULL != (cm = handle->control_pending_head))
1498 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1499 handle->control_pending_tail,
1503 if (cm->cont != NULL)
1504 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1507 if (handle->client != NULL)
1509 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1510 handle->client = NULL;
1512 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1513 &disconnect_and_free_peer_entry,
1515 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1517 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1518 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1520 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1521 handle->peers = NULL;
1522 GNUNET_break (handle->ready_peer_head == NULL);
1523 GNUNET_free (handle);
1528 * Task that calls 'request_next_transmission'.
1530 * @param cls the 'struct PeerRecord*'
1531 * @param tc scheduler context
1534 run_request_next_transmission (void *cls,
1535 const struct GNUNET_SCHEDULER_TaskContext *tc)
1537 struct PeerRecord *pr = cls;
1539 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
1540 request_next_transmission (pr);
1545 * Ask the core to call "notify" once it is ready to transmit the
1546 * given number of bytes to the specified "target". Must only be
1547 * called after a connection to the respective peer has been
1548 * established (and the client has been informed about this).
1550 * @param handle connection to core service
1551 * @param cork is corking allowed for this transmission?
1552 * @param priority how important is the message?
1553 * @param maxdelay how long can the message wait?
1554 * @param target who should receive the message,
1555 * use NULL for this peer (loopback)
1556 * @param notify_size how many bytes of buffer space does notify want?
1557 * @param notify function to call when buffer space is available
1558 * @param notify_cls closure for notify
1559 * @return non-NULL if the notify callback was queued,
1560 * NULL if we can not even queue the request (insufficient
1561 * memory); if NULL is returned, "notify" will NOT be called.
1563 struct GNUNET_CORE_TransmitHandle *
1564 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1567 struct GNUNET_TIME_Relative maxdelay,
1568 const struct GNUNET_PeerIdentity *target,
1570 GNUNET_CONNECTION_TransmitReadyNotify notify,
1573 struct PeerRecord *pr;
1574 struct GNUNET_CORE_TransmitHandle *th;
1575 struct GNUNET_CORE_TransmitHandle *pos;
1576 struct GNUNET_CORE_TransmitHandle *prev;
1577 struct GNUNET_CORE_TransmitHandle *minp;
1579 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1580 &target->hashPubKey);
1583 /* attempt to send to peer that is not connected */
1584 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1585 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1586 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1590 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1591 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1592 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1594 GNUNET_assert(NULL != notify);
1595 th->get_message = notify;
1596 th->get_message_cls = notify_cls;
1597 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1598 th->priority = priority;
1599 th->msize = notify_size;
1601 /* bound queue size */
1602 if (pr->queue_size == handle->queue_size)
1604 /* find lowest-priority entry, but skip the head of the list */
1605 minp = pr->pending_head->next;
1607 while (prev != NULL)
1609 if (prev->priority < minp->priority)
1615 GNUNET_break (handle->queue_size != 0);
1616 GNUNET_break (pr->queue_size == 1);
1619 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1620 "Dropping transmission request: cannot drop queue head and limit is one\n");
1624 if (priority <= minp->priority)
1627 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1628 "Dropping transmission request: priority too low\n");
1631 return NULL; /* priority too low */
1633 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1638 minp->get_message (minp->get_message_cls,
1643 /* Order entries by deadline, but SKIP 'HEAD' if
1644 we're in the 'ready_peer_*' DLL */
1645 pos = pr->pending_head;
1646 if ( (pr->prev != NULL) ||
1647 (pr->next != NULL) ||
1648 (pr == handle->ready_peer_head) )
1650 GNUNET_assert (pos != NULL);
1651 pos = pos->next; /* skip head */
1654 /* insertion sort */
1656 while ( (pos != NULL) &&
1657 (pos->timeout.abs_value < th->timeout.abs_value) )
1662 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1667 /* was the request queue previously empty? */
1669 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1670 "Transmission request added to queue\n");
1672 if ( (pr->pending_head == th) &&
1673 (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK) &&
1674 (pr->next == NULL) &&
1675 (pr->prev == NULL) &&
1676 (handle->ready_peer_head != pr) )
1677 pr->ntr_task = GNUNET_SCHEDULER_add_now (&run_request_next_transmission, pr);
1683 * Cancel the specified transmission-ready notification.
1685 * @param th handle that was returned by "notify_transmit_ready".
1688 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1691 struct PeerRecord *pr = th->peer;
1692 struct GNUNET_CORE_Handle *h = pr->ch;
1695 was_head = (pr->pending_head == th);
1696 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1702 /* we're currently in the control queue, remove */
1703 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1704 h->control_pending_tail,
1706 GNUNET_free (th->cm);
1711 if ( (pr->prev != NULL) ||
1712 (pr->next != NULL) ||
1713 (pr == h->ready_peer_head) )
1715 /* the request that was 'approved' by core was
1716 canceled before it could be transmitted; remove
1717 us from the 'ready' list */
1718 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1722 request_next_transmission (pr);
1727 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1730 * Handle for a request to the core to connect to
1731 * a particular peer. Can be used to cancel the request
1732 * (before the 'cont'inuation is called).
1734 struct GNUNET_CORE_PeerRequestHandle
1738 * Link to control message.
1740 struct ControlMessage *cm;
1745 struct GNUNET_CORE_Handle *h;
1748 * Continuation to run when done.
1750 GNUNET_CORE_ControlContinuation cont;
1753 * Closure for 'cont'.
1761 * Continuation called when the control message was transmitted.
1762 * Calls the original continuation and frees the remaining
1765 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1766 * @param success was the request transmitted?
1769 peer_request_connect_cont (void *cls,
1772 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1774 if (ret->cont != NULL)
1775 ret->cont (ret->cont_cls, success);
1781 * Request that the core should try to connect to a particular peer.
1782 * Once the request has been transmitted to the core, the continuation
1783 * function will be called. Note that this does NOT mean that a
1784 * connection was successfully established -- it only means that the
1785 * core will now try. Successful establishment of the connection
1786 * will be signalled to the 'connects' callback argument of
1787 * 'GNUNET_CORE_connect' only. If the core service does not respond
1788 * to our connection attempt within the given time frame, 'cont' will
1789 * be called with the TIMEOUT reason code.
1791 * @param h core handle
1792 * @param peer who should we connect to
1793 * @param cont function to call once the request has been completed (or timed out)
1794 * @param cont_cls closure for cont
1796 * @return NULL on error or already connected,
1797 * otherwise handle for cancellation
1799 struct GNUNET_CORE_PeerRequestHandle *
1800 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1801 const struct GNUNET_PeerIdentity * peer,
1802 GNUNET_CORE_ControlContinuation cont,
1805 struct GNUNET_CORE_PeerRequestHandle *ret;
1806 struct ControlMessage *cm;
1807 struct ConnectMessage *msg;
1809 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers,
1813 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1814 "Peers are already connected!\n");
1819 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1820 sizeof (struct ConnectMessage));
1821 msg = (struct ConnectMessage*) &cm[1];
1822 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1823 msg->header.size = htons (sizeof (struct ConnectMessage));
1824 msg->reserved = htonl (0);
1826 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1827 h->control_pending_tail,
1829 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1833 ret->cont_cls = cont_cls;
1834 cm->cont = &peer_request_connect_cont;
1837 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1838 "Queueing REQUEST_CONNECT request\n");
1840 trigger_next_request (h, GNUNET_NO);
1846 * Cancel a pending request to connect to a particular peer. Must not
1847 * be called after the 'cont' function was invoked.
1849 * @param req request handle that was returned for the original request
1852 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1854 struct GNUNET_CORE_Handle *h = req->h;
1855 struct ControlMessage *cm = req->cm;
1858 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1859 "A CHANGE PREFERENCE request was cancelled!\n");
1861 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1862 h->control_pending_tail,
1869 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1872 struct GNUNET_CORE_InformationRequestContext
1876 * Our connection to the service.
1878 struct GNUNET_CORE_Handle *h;
1881 * Link to control message, NULL if CM was sent.
1883 struct ControlMessage *cm;
1886 * Link to peer record.
1888 struct PeerRecord *pr;
1893 * CM was sent, remove link so we don't double-free.
1895 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1896 * @param success were we successful?
1899 change_preference_send_continuation (void *cls,
1902 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1909 * Obtain statistics and/or change preferences for the given peer.
1911 * @param h core handle
1912 * @param peer identifies the peer
1913 * @param timeout after how long should we give up (and call "info" with NULL
1914 * for "peer" to signal an error)?
1915 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1916 * caller should set "bw_out" to "-1" to avoid changing
1917 * the current value; otherwise "bw_out" will be lowered to
1918 * the specified value; passing a pointer to "0" can be used to force
1919 * us to disconnect from the peer; "bw_out" might not increase
1920 * as specified since the upper bound is generally
1921 * determined by the other peer!
1922 * @param amount reserve N bytes for receiving, negative
1923 * amounts can be used to undo a (recent) reservation;
1924 * @param preference increase incoming traffic share preference by this amount;
1925 * in the absence of "amount" reservations, we use this
1926 * preference value to assign proportional bandwidth shares
1927 * to all connected peers
1928 * @param info function to call with the resulting configuration information
1929 * @param info_cls closure for info
1930 * @return NULL on error
1932 struct GNUNET_CORE_InformationRequestContext *
1933 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1934 const struct GNUNET_PeerIdentity *peer,
1935 struct GNUNET_TIME_Relative timeout,
1936 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1938 uint64_t preference,
1939 GNUNET_CORE_PeerConfigurationInfoCallback info,
1942 struct GNUNET_CORE_InformationRequestContext *irc;
1943 struct PeerRecord *pr;
1944 struct RequestInfoMessage *rim;
1945 struct ControlMessage *cm;
1947 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1951 /* attempt to change preference on peer that is not connected */
1955 if (pr->pcic != NULL)
1957 /* second change before first one is done */
1961 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1964 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1965 sizeof (struct RequestInfoMessage));
1966 cm->cont = &change_preference_send_continuation;
1969 rim = (struct RequestInfoMessage*) &cm[1];
1970 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1971 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1972 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1973 rim->limit_outbound = bw_out;
1974 rim->reserve_inbound = htonl (amount);
1975 rim->preference_change = GNUNET_htonll(preference);
1978 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1979 "Queueing CHANGE PREFERENCE request for peer `%s' with RIM %u\n",
1981 (unsigned int) pr->rim_id);
1983 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1984 h->control_pending_tail,
1987 pr->pcic_cls = info_cls;
1988 pr->pcic_ptr = irc; /* for free'ing irc */
1989 if (NULL != h->client)
1990 trigger_next_request (h, GNUNET_NO);
1996 * Cancel request for getting information about a peer.
1997 * Note that an eventual change in preference, trust or bandwidth
1998 * assignment MAY have already been committed at the time,
1999 * so cancelling a request is NOT sure to undo the original
2000 * request. The original request may or may not still commit.
2001 * The only thing cancellation ensures is that the callback
2002 * from the original request will no longer be called.
2004 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
2007 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
2009 struct GNUNET_CORE_Handle *h = irc->h;
2010 struct PeerRecord *pr = irc->pr;
2012 GNUNET_assert (pr->pcic_ptr == irc);
2013 if (irc->cm != NULL)
2015 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
2016 h->control_pending_tail,
2018 GNUNET_free (irc->cm);
2021 pr->pcic_cls = NULL;
2022 pr->pcic_ptr = NULL;
2027 /* end of core_api.c */