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 while (NULL != (th = pr->pending_head))
422 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
427 th->get_message (th->get_message_cls,
433 if (NULL != (pcic = pr->pcic))
435 pcic_cls = pr->pcic_cls;
436 GNUNET_CORE_peer_change_preference_cancel (pr->pcic_ptr);
441 GNUNET_TIME_UNIT_FOREVER_REL,
444 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
446 GNUNET_SCHEDULER_cancel (pr->timeout_task);
447 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
449 if (pr->ntr_task != GNUNET_SCHEDULER_NO_TASK)
451 GNUNET_SCHEDULER_cancel (pr->ntr_task);
452 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
454 GNUNET_assert (pr->queue_size == 0);
455 if ( (pr->prev != NULL) ||
456 (pr->next != NULL) ||
457 (h->ready_peer_head == pr) )
458 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
461 if (h->disconnects != NULL)
462 h->disconnects (h->cls,
464 GNUNET_assert (GNUNET_YES ==
465 GNUNET_CONTAINER_multihashmap_remove (h->peers,
468 GNUNET_assert (pr->pending_head == NULL);
469 GNUNET_assert (pr->pending_tail == NULL);
470 GNUNET_assert (pr->ch = h);
471 GNUNET_assert (pr->queue_size == 0);
472 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
473 GNUNET_assert (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK);
480 * Close down any existing connection to the CORE service and
481 * try re-establishing it later.
483 * @param h our handle
486 reconnect_later (struct GNUNET_CORE_Handle *h)
488 struct ControlMessage *cm;
489 struct PeerRecord *pr;
491 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
492 if (h->client != NULL)
494 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
498 h->currently_down = GNUNET_YES;
499 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
500 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
503 while (NULL != (cm = h->control_pending_head))
505 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
506 h->control_pending_tail,
510 if (cm->cont != NULL)
511 cm->cont (cm->cont_cls, GNUNET_NO);
514 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
515 &disconnect_and_free_peer_entry,
517 while (NULL != (pr = h->ready_peer_head))
518 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
521 GNUNET_assert (h->control_pending_head == NULL);
522 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
524 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
529 * Check the list of pending requests, send the next
532 * @param h core handle
533 * @param ignore_currently_down transmit message even if not initialized?
536 trigger_next_request (struct GNUNET_CORE_Handle *h,
537 int ignore_currently_down);
541 * The given request hit its timeout. Remove from the
542 * doubly-linked list and call the respective continuation.
544 * @param cls the transmit handle of the request that timed out
545 * @param tc context, can be NULL (!)
548 transmission_timeout (void *cls,
549 const struct GNUNET_SCHEDULER_TaskContext *tc);
553 * Send a control message to the peer asking for transmission
554 * of the message in the given peer record.
556 * @param pr peer to request transmission to
559 request_next_transmission (struct PeerRecord *pr)
561 struct GNUNET_CORE_Handle *h = pr->ch;
562 struct ControlMessage *cm;
563 struct SendMessageRequest *smr;
564 struct GNUNET_CORE_TransmitHandle *th;
566 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
568 GNUNET_SCHEDULER_cancel (pr->timeout_task);
569 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
571 if (NULL == (th = pr->pending_head))
573 trigger_next_request (h, GNUNET_NO);
577 return; /* already done */
578 GNUNET_assert (pr->prev == NULL);
579 GNUNET_assert (pr->next == NULL);
580 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
581 &transmission_timeout,
583 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
584 sizeof (struct SendMessageRequest));
587 smr = (struct SendMessageRequest*) &cm[1];
588 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
589 smr->header.size = htons (sizeof (struct SendMessageRequest));
590 smr->priority = htonl (th->priority);
591 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
592 smr->peer = pr->peer;
593 smr->queue_size = htonl (pr->queue_size);
594 smr->size = htons (th->msize);
595 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
596 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
597 h->control_pending_tail,
600 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
601 "Adding SEND REQUEST for peer `%s' to message queue\n",
602 GNUNET_i2s (&pr->peer));
604 trigger_next_request (h, GNUNET_NO);
609 * The given request hit its timeout. Remove from the
610 * doubly-linked list and call the respective continuation.
612 * @param cls the transmit handle of the request that timed out
613 * @param tc context, can be NULL (!)
616 transmission_timeout (void *cls,
617 const struct GNUNET_SCHEDULER_TaskContext *tc)
619 struct PeerRecord *pr = cls;
620 struct GNUNET_CORE_Handle *h = pr->ch;
621 struct GNUNET_CORE_TransmitHandle *th;
623 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
624 th = pr->pending_head;
625 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
629 if ( (pr->prev != NULL) ||
630 (pr->next != NULL) ||
631 (pr == h->ready_peer_head) )
633 /* the request that was 'approved' by core was
634 canceled before it could be transmitted; remove
635 us from the 'ready' list */
636 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
641 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
642 "Signalling timeout of request for transmission to CORE service\n");
644 request_next_transmission (pr);
645 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
651 * Transmit the next message to the core service.
654 transmit_message (void *cls,
658 struct GNUNET_CORE_Handle *h = cls;
659 struct ControlMessage *cm;
660 struct GNUNET_CORE_TransmitHandle *th;
661 struct PeerRecord *pr;
662 struct SendMessage *sm;
663 const struct GNUNET_MessageHeader *hdr;
667 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
672 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
673 "Transmission failed, initiating reconnect\n");
678 /* first check for control messages */
679 if (NULL != (cm = h->control_pending_head))
681 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
682 msize = ntohs (hdr->size);
685 trigger_next_request (h, GNUNET_NO);
689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
690 "Transmitting control message with %u bytes of type %u to core.\n",
691 (unsigned int) msize,
692 (unsigned int) ntohs (hdr->type));
694 memcpy (buf, hdr, msize);
695 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
696 h->control_pending_tail,
700 if (NULL != cm->cont)
701 cm->cont (cm->cont_cls, GNUNET_OK);
703 trigger_next_request (h, GNUNET_NO);
706 /* now check for 'ready' P2P messages */
707 if (NULL != (pr = h->ready_peer_head))
709 GNUNET_assert (pr->pending_head != NULL);
710 th = pr->pending_head;
711 if (size < th->msize + sizeof (struct SendMessage))
713 trigger_next_request (h, GNUNET_NO);
716 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
719 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
723 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
725 GNUNET_SCHEDULER_cancel (pr->timeout_task);
726 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
729 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
730 "Transmitting SEND request to `%s' with %u bytes.\n",
731 GNUNET_i2s (&pr->peer),
732 (unsigned int) th->msize);
734 sm = (struct SendMessage *) buf;
735 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
736 sm->priority = htonl (th->priority);
737 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
739 sm->cork = htonl ((uint32_t) th->cork);
740 sm->reserved = htonl (0);
741 ret = th->get_message (th->get_message_cls,
742 size - sizeof (struct SendMessage),
746 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
747 "Transmitting SEND request to `%s' yielded %u bytes.\n",
748 GNUNET_i2s (&pr->peer),
755 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
756 "Size of clients message to peer %s is 0!\n",
757 GNUNET_i2s(&pr->peer));
759 /* client decided to send nothing! */
760 request_next_transmission (pr);
764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
765 "Produced SEND message to core with %u bytes payload\n",
768 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
769 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
772 request_next_transmission (pr);
775 ret += sizeof (struct SendMessage);
776 sm->header.size = htons (ret);
777 GNUNET_assert (ret <= size);
778 request_next_transmission (pr);
786 * Check the list of pending requests, send the next
789 * @param h core handle
790 * @param ignore_currently_down transmit message even if not initialized?
793 trigger_next_request (struct GNUNET_CORE_Handle *h,
794 int ignore_currently_down)
798 if ( (GNUNET_YES == h->currently_down) &&
799 (ignore_currently_down == GNUNET_NO) )
802 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
803 "Core connection down, not processing queue\n");
810 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
811 "Request pending, not processing queue\n");
815 if (h->control_pending_head != NULL)
816 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
817 else if (h->ready_peer_head != NULL)
818 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
822 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
823 "Request queue empty, not processing queue\n");
825 return; /* no pending message */
827 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
829 GNUNET_TIME_UNIT_FOREVER_REL,
831 &transmit_message, h);
836 * Handler for notification messages received from the core.
838 * @param cls our "struct GNUNET_CORE_Handle"
839 * @param msg the message received from the core service
842 main_notify_handler (void *cls,
843 const struct GNUNET_MessageHeader *msg)
845 struct GNUNET_CORE_Handle *h = cls;
846 const struct InitReplyMessage *m;
847 const struct ConnectNotifyMessage *cnm;
848 const struct DisconnectNotifyMessage *dnm;
849 const struct NotifyTrafficMessage *ntm;
850 const struct GNUNET_MessageHeader *em;
851 const struct ConfigurationInfoMessage *cim;
852 const struct PeerStatusNotifyMessage *psnm;
853 const struct SendMessageReady *smr;
854 const struct GNUNET_CORE_MessageHandler *mh;
855 GNUNET_CORE_StartupCallback init;
856 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
857 struct PeerRecord *pr;
858 struct GNUNET_CORE_TransmitHandle *th;
867 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
869 ("Client was disconnected from core service, trying to reconnect.\n"));
873 msize = ntohs (msg->size);
875 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
876 "Processing message of type %u and size %u from core service\n",
877 ntohs (msg->type), msize);
879 switch (ntohs (msg->type))
881 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
882 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
888 m = (const struct InitReplyMessage *) msg;
889 GNUNET_break (0 == ntohl (m->reserved));
890 /* start our message processing loop */
891 if (GNUNET_YES == h->currently_down)
893 h->currently_down = GNUNET_NO;
894 trigger_next_request (h, GNUNET_NO);
896 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
897 GNUNET_CRYPTO_hash (&m->publicKey,
899 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
901 if (NULL != (init = h->init))
903 /* mark so we don't call init on reconnect */
906 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
907 "Connected to core service of peer `%s'.\n",
908 GNUNET_i2s (&h->me));
910 init (h->cls, h, &h->me, &m->publicKey);
915 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
916 "Successfully reconnected to core service.\n");
919 /* fake 'connect to self' */
920 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
922 GNUNET_assert (pr == NULL);
923 pr = GNUNET_malloc (sizeof (struct PeerRecord));
926 GNUNET_assert (GNUNET_YES ==
927 GNUNET_CONTAINER_multihashmap_put (h->peers,
930 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
931 if (NULL != h->connects)
936 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
937 if (msize < sizeof (struct ConnectNotifyMessage))
943 cnm = (const struct ConnectNotifyMessage *) msg;
944 ats_count = ntohl (cnm->ats_count);
945 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
946 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
953 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
954 "Received notification about connection from `%s'.\n",
955 GNUNET_i2s (&cnm->peer));
957 if (0 == memcmp (&h->me,
959 sizeof (struct GNUNET_PeerIdentity)))
961 /* connect to self!? */
965 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
966 &cnm->peer.hashPubKey);
973 pr = GNUNET_malloc (sizeof (struct PeerRecord));
974 pr->peer = cnm->peer;
976 GNUNET_assert (GNUNET_YES ==
977 GNUNET_CONTAINER_multihashmap_put (h->peers,
978 &cnm->peer.hashPubKey,
980 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
981 if (NULL != h->connects)
986 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
987 if (msize != sizeof (struct DisconnectNotifyMessage))
993 dnm = (const struct DisconnectNotifyMessage *) msg;
994 if (0 == memcmp (&h->me,
996 sizeof (struct GNUNET_PeerIdentity)))
998 /* connection to self!? */
1002 GNUNET_break (0 == ntohl (dnm->reserved));
1004 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1005 "Received notification about disconnect from `%s'.\n",
1006 GNUNET_i2s (&dnm->peer));
1008 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1009 &dnm->peer.hashPubKey);
1013 reconnect_later (h);
1016 trigger = ( (pr->prev != NULL) ||
1017 (pr->next != NULL) ||
1018 (h->ready_peer_head == pr) );
1019 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
1021 trigger_next_request (h, GNUNET_NO);
1023 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
1024 if (NULL == h->status_events)
1029 if (msize < sizeof (struct PeerStatusNotifyMessage))
1032 reconnect_later (h);
1035 psnm = (const struct PeerStatusNotifyMessage *) msg;
1036 if (0 == memcmp (&h->me,
1038 sizeof (struct GNUNET_PeerIdentity)))
1044 ats_count = ntohl (psnm->ats_count);
1045 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1046 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1049 reconnect_later (h);
1053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1054 "Received notification about status change by `%s'.\n",
1055 GNUNET_i2s (&psnm->peer));
1057 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1058 &psnm->peer.hashPubKey);
1062 reconnect_later (h);
1065 h->status_events (h->cls,
1068 psnm->bandwidth_out,
1069 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1072 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1073 if (msize < sizeof (struct NotifyTrafficMessage))
1076 reconnect_later (h);
1079 ntm = (const struct NotifyTrafficMessage *) msg;
1081 ats_count = ntohl (ntm->ats_count);
1082 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1083 + sizeof (struct GNUNET_MessageHeader)) ||
1084 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1087 reconnect_later (h);
1090 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1092 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1093 "Received message of type %u and size %u from peer `%4s'\n",
1096 GNUNET_i2s (&ntm->peer));
1098 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1099 &ntm->peer.hashPubKey);
1103 reconnect_later (h);
1106 if ((GNUNET_NO == h->inbound_hdr_only) &&
1107 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1108 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1111 reconnect_later (h);
1114 et = ntohs (em->type);
1115 for (hpos = 0; hpos < h->hcnt; hpos++)
1117 mh = &h->handlers[hpos];
1120 if ((mh->expected_size != ntohs (em->size)) &&
1121 (mh->expected_size != 0))
1127 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1130 /* error in processing, do not process other messages! */
1134 if (NULL != h->inbound_notify)
1135 h->inbound_notify (h->cls, &ntm->peer, em,
1138 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1139 if (msize < sizeof (struct NotifyTrafficMessage))
1142 reconnect_later (h);
1145 ntm = (const struct NotifyTrafficMessage *) msg;
1146 if (0 == memcmp (&h->me,
1148 sizeof (struct GNUNET_PeerIdentity)))
1154 ats_count = ntohl (ntm->ats_count);
1155 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1156 + sizeof (struct GNUNET_MessageHeader)) ||
1157 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1160 reconnect_later (h);
1163 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1164 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1165 &ntm->peer.hashPubKey);
1169 reconnect_later (h);
1173 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1174 "Received notification about transmission to `%s'.\n",
1175 GNUNET_i2s (&ntm->peer));
1177 if ((GNUNET_NO == h->outbound_hdr_only) &&
1178 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1179 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1182 reconnect_later (h);
1185 if (NULL == h->outbound_notify)
1190 h->outbound_notify (h->cls, &ntm->peer, em,
1193 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1194 if (msize != sizeof (struct SendMessageReady))
1197 reconnect_later (h);
1200 smr = (const struct SendMessageReady *) msg;
1201 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1202 &smr->peer.hashPubKey);
1206 reconnect_later (h);
1210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1211 "Received notification about transmission readiness to `%s'.\n",
1212 GNUNET_i2s (&smr->peer));
1214 if (pr->pending_head == NULL)
1216 /* request must have been cancelled between the original request
1217 and the response from core, ignore core's readiness */
1221 th = pr->pending_head;
1222 if (ntohs (smr->smr_id) != th->smr_id)
1224 /* READY message is for expired or cancelled message,
1225 ignore! (we should have already sent another request) */
1228 if ( (pr->prev != NULL) ||
1229 (pr->next != NULL) ||
1230 (h->ready_peer_head == pr) )
1232 /* we should not already be on the ready list... */
1234 reconnect_later (h);
1237 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1240 trigger_next_request (h, GNUNET_NO);
1242 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1243 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1246 reconnect_later (h);
1249 cim = (const struct ConfigurationInfoMessage*) msg;
1250 if (0 == memcmp (&h->me,
1252 sizeof (struct GNUNET_PeerIdentity)))
1259 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1260 "Received notification about configuration update for `%s' with RIM %u.\n",
1261 GNUNET_i2s (&cim->peer),
1262 (unsigned int) ntohl (cim->rim_id));
1264 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1265 &cim->peer.hashPubKey);
1269 reconnect_later (h);
1272 if (pr->rim_id != ntohl (cim->rim_id))
1275 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1276 "Reservation ID mismatch in notification...\n");
1282 GNUNET_free_non_null (pr->pcic_ptr);
1283 pr->pcic_ptr = NULL;
1288 ntohl (cim->reserved_amount),
1289 GNUNET_TIME_relative_ntoh (cim->reserve_delay),
1290 GNUNET_ntohll (cim->preference));
1293 reconnect_later (h);
1296 GNUNET_CLIENT_receive (h->client,
1297 &main_notify_handler, h,
1298 GNUNET_TIME_UNIT_FOREVER_REL);
1303 * Task executed once we are done transmitting the INIT message.
1304 * Starts our 'receive' loop.
1306 * @param cls the 'struct GNUNET_CORE_Handle'
1307 * @param success were we successful
1310 init_done_task (void *cls,
1313 struct GNUNET_CORE_Handle *h = cls;
1315 if (success == GNUNET_SYSERR)
1316 return; /* shutdown */
1317 if (success == GNUNET_NO)
1320 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1321 "Failed to exchange INIT with core, retrying\n");
1323 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1324 reconnect_later (h);
1327 GNUNET_CLIENT_receive (h->client,
1328 &main_notify_handler,
1330 GNUNET_TIME_UNIT_FOREVER_REL);
1335 * Our current client connection went down. Clean it up
1336 * and try to reconnect!
1338 * @param h our handle to the core service
1341 reconnect (struct GNUNET_CORE_Handle *h)
1343 struct ControlMessage *cm;
1344 struct InitMessage *init;
1351 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1352 "Reconnecting to CORE service\n");
1354 GNUNET_assert (h->client == NULL);
1355 GNUNET_assert (h->currently_down == GNUNET_YES);
1356 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1357 if (h->client == NULL)
1359 reconnect_later (h);
1362 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1363 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1365 cm->cont = &init_done_task;
1367 init = (struct InitMessage*) &cm[1];
1368 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1369 init->header.size = htons (msize);
1370 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1371 if (h->status_events != NULL)
1372 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1373 if (h->inbound_notify != NULL)
1375 if (h->inbound_hdr_only)
1376 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1378 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1380 if (h->outbound_notify != NULL)
1382 if (h->outbound_hdr_only)
1383 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1385 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1387 init->options = htonl (opt);
1388 ts = (uint16_t *) &init[1];
1389 for (hpos = 0; hpos < h->hcnt; hpos++)
1390 ts[hpos] = htons (h->handlers[hpos].type);
1391 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1392 h->control_pending_tail,
1394 trigger_next_request (h, GNUNET_YES);
1400 * Connect to the core service. Note that the connection may
1401 * complete (or fail) asynchronously.
1403 * @param cfg configuration to use
1404 * @param queue_size size of the per-peer message queue
1405 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1406 * @param init callback to call on timeout or once we have successfully
1407 * connected to the core service; note that timeout is only meaningful if init is not NULL
1408 * @param connects function to call on peer connect, can be NULL
1409 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1410 * @param status_events function to call on changes to peer connection status, can be NULL
1411 * @param inbound_notify function to call for all inbound messages, can be NULL
1412 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1413 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1414 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1415 * @param outbound_notify function to call for all outbound messages, can be NULL
1416 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1417 * GNUNET_MessageHeader and hence we do not need to give it the full message
1418 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1419 * @param handlers callbacks for messages we care about, NULL-terminated
1420 * @return handle to the core service (only useful for disconnect until 'init' is called);
1421 * NULL on error (in this case, init is never called)
1423 struct GNUNET_CORE_Handle *
1424 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1425 unsigned int queue_size,
1427 GNUNET_CORE_StartupCallback init,
1428 GNUNET_CORE_ConnectEventHandler connects,
1429 GNUNET_CORE_DisconnectEventHandler disconnects,
1430 GNUNET_CORE_PeerStatusEventHandler status_events,
1431 GNUNET_CORE_MessageCallback inbound_notify,
1432 int inbound_hdr_only,
1433 GNUNET_CORE_MessageCallback outbound_notify,
1434 int outbound_hdr_only,
1435 const struct GNUNET_CORE_MessageHandler *handlers)
1437 struct GNUNET_CORE_Handle *h;
1439 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1441 h->queue_size = queue_size;
1444 h->connects = connects;
1445 h->disconnects = disconnects;
1446 h->status_events = status_events;
1447 h->inbound_notify = inbound_notify;
1448 h->outbound_notify = outbound_notify;
1449 h->inbound_hdr_only = inbound_hdr_only;
1450 h->outbound_hdr_only = outbound_hdr_only;
1451 h->handlers = handlers;
1453 h->currently_down = GNUNET_YES;
1454 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1455 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1456 while (handlers[h->hcnt].callback != NULL)
1458 GNUNET_assert (h->hcnt <
1459 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1460 sizeof (struct InitMessage)) / sizeof (uint16_t));
1462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1463 "Connecting to CORE service\n");
1471 * Disconnect from the core service. This function can only
1472 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1473 * requests have been explicitly canceled.
1475 * @param handle connection to core to disconnect
1478 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1480 struct ControlMessage *cm;
1483 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1484 "Disconnecting from CORE service\n");
1486 if (handle->cth != NULL)
1488 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1491 while (NULL != (cm = handle->control_pending_head))
1493 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1494 handle->control_pending_tail,
1498 if (cm->cont != NULL)
1499 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1502 if (handle->client != NULL)
1504 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1505 handle->client = NULL;
1507 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1508 &disconnect_and_free_peer_entry,
1510 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1512 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1513 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1515 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1516 GNUNET_break (handle->ready_peer_head == NULL);
1517 GNUNET_free (handle);
1522 * Task that calls 'request_next_transmission'.
1524 * @param cls the 'struct PeerRecord*'
1525 * @param tc scheduler context
1528 run_request_next_transmission (void *cls,
1529 const struct GNUNET_SCHEDULER_TaskContext *tc)
1531 struct PeerRecord *pr = cls;
1533 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
1534 request_next_transmission (pr);
1539 * Ask the core to call "notify" once it is ready to transmit the
1540 * given number of bytes to the specified "target". Must only be
1541 * called after a connection to the respective peer has been
1542 * established (and the client has been informed about this).
1544 * @param handle connection to core service
1545 * @param cork is corking allowed for this transmission?
1546 * @param priority how important is the message?
1547 * @param maxdelay how long can the message wait?
1548 * @param target who should receive the message,
1549 * use NULL for this peer (loopback)
1550 * @param notify_size how many bytes of buffer space does notify want?
1551 * @param notify function to call when buffer space is available
1552 * @param notify_cls closure for notify
1553 * @return non-NULL if the notify callback was queued,
1554 * NULL if we can not even queue the request (insufficient
1555 * memory); if NULL is returned, "notify" will NOT be called.
1557 struct GNUNET_CORE_TransmitHandle *
1558 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1561 struct GNUNET_TIME_Relative maxdelay,
1562 const struct GNUNET_PeerIdentity *target,
1564 GNUNET_CONNECTION_TransmitReadyNotify notify,
1567 struct PeerRecord *pr;
1568 struct GNUNET_CORE_TransmitHandle *th;
1569 struct GNUNET_CORE_TransmitHandle *pos;
1570 struct GNUNET_CORE_TransmitHandle *prev;
1571 struct GNUNET_CORE_TransmitHandle *minp;
1573 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1574 &target->hashPubKey);
1577 /* attempt to send to peer that is not connected */
1578 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1579 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1580 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1584 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1585 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1586 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1588 GNUNET_assert(NULL != notify);
1589 th->get_message = notify;
1590 th->get_message_cls = notify_cls;
1591 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1592 th->priority = priority;
1593 th->msize = notify_size;
1595 /* bound queue size */
1596 if (pr->queue_size == handle->queue_size)
1598 /* find lowest-priority entry, but skip the head of the list */
1599 minp = pr->pending_head->next;
1601 while (prev != NULL)
1603 if (prev->priority < minp->priority)
1609 GNUNET_break (handle->queue_size != 0);
1610 GNUNET_break (pr->queue_size == 1);
1613 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1614 "Dropping transmission request: cannot drop queue head and limit is one\n");
1618 if (priority <= minp->priority)
1621 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1622 "Dropping transmission request: priority too low\n");
1625 return NULL; /* priority too low */
1627 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1632 minp->get_message (minp->get_message_cls,
1637 /* Order entries by deadline, but SKIP 'HEAD' if
1638 we're in the 'ready_peer_*' DLL */
1639 pos = pr->pending_head;
1640 if ( (pr->prev != NULL) ||
1641 (pr->next != NULL) ||
1642 (pr == handle->ready_peer_head) )
1644 GNUNET_assert (pos != NULL);
1645 pos = pos->next; /* skip head */
1648 /* insertion sort */
1650 while ( (pos != NULL) &&
1651 (pos->timeout.abs_value < th->timeout.abs_value) )
1656 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1661 /* was the request queue previously empty? */
1663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1664 "Transmission request added to queue\n");
1666 if ( (pr->pending_head == th) &&
1667 (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK) &&
1668 (pr->next == NULL) &&
1669 (pr->prev == NULL) &&
1670 (handle->ready_peer_head != pr) )
1671 pr->ntr_task = GNUNET_SCHEDULER_add_now (&run_request_next_transmission, pr);
1677 * Cancel the specified transmission-ready notification.
1679 * @param th handle that was returned by "notify_transmit_ready".
1682 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1685 struct PeerRecord *pr = th->peer;
1686 struct GNUNET_CORE_Handle *h = pr->ch;
1689 was_head = (pr->pending_head == th);
1690 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1696 /* we're currently in the control queue, remove */
1697 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1698 h->control_pending_tail,
1700 GNUNET_free (th->cm);
1705 if ( (pr->prev != NULL) ||
1706 (pr->next != NULL) ||
1707 (pr == h->ready_peer_head) )
1709 /* the request that was 'approved' by core was
1710 canceled before it could be transmitted; remove
1711 us from the 'ready' list */
1712 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1716 request_next_transmission (pr);
1721 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1724 * Handle for a request to the core to connect to
1725 * a particular peer. Can be used to cancel the request
1726 * (before the 'cont'inuation is called).
1728 struct GNUNET_CORE_PeerRequestHandle
1732 * Link to control message.
1734 struct ControlMessage *cm;
1739 struct GNUNET_CORE_Handle *h;
1742 * Continuation to run when done.
1744 GNUNET_CORE_ControlContinuation cont;
1747 * Closure for 'cont'.
1755 * Continuation called when the control message was transmitted.
1756 * Calls the original continuation and frees the remaining
1759 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1760 * @param success was the request transmitted?
1763 peer_request_connect_cont (void *cls,
1766 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1768 if (ret->cont != NULL)
1769 ret->cont (ret->cont_cls, success);
1775 * Request that the core should try to connect to a particular peer.
1776 * Once the request has been transmitted to the core, the continuation
1777 * function will be called. Note that this does NOT mean that a
1778 * connection was successfully established -- it only means that the
1779 * core will now try. Successful establishment of the connection
1780 * will be signalled to the 'connects' callback argument of
1781 * 'GNUNET_CORE_connect' only. If the core service does not respond
1782 * to our connection attempt within the given time frame, 'cont' will
1783 * be called with the TIMEOUT reason code.
1785 * @param h core handle
1786 * @param peer who should we connect to
1787 * @param cont function to call once the request has been completed (or timed out)
1788 * @param cont_cls closure for cont
1790 * @return NULL on error or already connected,
1791 * otherwise handle for cancellation
1793 struct GNUNET_CORE_PeerRequestHandle *
1794 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1795 const struct GNUNET_PeerIdentity * peer,
1796 GNUNET_CORE_ControlContinuation cont,
1799 struct GNUNET_CORE_PeerRequestHandle *ret;
1800 struct ControlMessage *cm;
1801 struct ConnectMessage *msg;
1803 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers,
1807 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1808 "Peers are already connected!\n");
1813 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1814 sizeof (struct ConnectMessage));
1815 msg = (struct ConnectMessage*) &cm[1];
1816 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1817 msg->header.size = htons (sizeof (struct ConnectMessage));
1818 msg->reserved = htonl (0);
1820 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1821 h->control_pending_tail,
1823 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1827 ret->cont_cls = cont_cls;
1828 cm->cont = &peer_request_connect_cont;
1831 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1832 "Queueing REQUEST_CONNECT request\n");
1834 trigger_next_request (h, GNUNET_NO);
1840 * Cancel a pending request to connect to a particular peer. Must not
1841 * be called after the 'cont' function was invoked.
1843 * @param req request handle that was returned for the original request
1846 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1848 struct GNUNET_CORE_Handle *h = req->h;
1849 struct ControlMessage *cm = req->cm;
1852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1853 "A CHANGE PREFERENCE request was cancelled!\n");
1855 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1856 h->control_pending_tail,
1863 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1866 struct GNUNET_CORE_InformationRequestContext
1870 * Our connection to the service.
1872 struct GNUNET_CORE_Handle *h;
1875 * Link to control message, NULL if CM was sent.
1877 struct ControlMessage *cm;
1880 * Link to peer record.
1882 struct PeerRecord *pr;
1887 * CM was sent, remove link so we don't double-free.
1889 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1890 * @param success were we successful?
1893 change_preference_send_continuation (void *cls,
1896 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1903 * Obtain statistics and/or change preferences for the given peer.
1905 * @param h core handle
1906 * @param peer identifies the peer
1907 * @param timeout after how long should we give up (and call "info" with NULL
1908 * for "peer" to signal an error)?
1909 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1910 * caller should set "bw_out" to "-1" to avoid changing
1911 * the current value; otherwise "bw_out" will be lowered to
1912 * the specified value; passing a pointer to "0" can be used to force
1913 * us to disconnect from the peer; "bw_out" might not increase
1914 * as specified since the upper bound is generally
1915 * determined by the other peer!
1916 * @param amount reserve N bytes for receiving, negative
1917 * amounts can be used to undo a (recent) reservation;
1918 * @param preference increase incoming traffic share preference by this amount;
1919 * in the absence of "amount" reservations, we use this
1920 * preference value to assign proportional bandwidth shares
1921 * to all connected peers
1922 * @param info function to call with the resulting configuration information
1923 * @param info_cls closure for info
1924 * @return NULL on error
1926 struct GNUNET_CORE_InformationRequestContext *
1927 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1928 const struct GNUNET_PeerIdentity *peer,
1929 struct GNUNET_TIME_Relative timeout,
1930 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1932 uint64_t preference,
1933 GNUNET_CORE_PeerConfigurationInfoCallback info,
1936 struct GNUNET_CORE_InformationRequestContext *irc;
1937 struct PeerRecord *pr;
1938 struct RequestInfoMessage *rim;
1939 struct ControlMessage *cm;
1941 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1945 /* attempt to change preference on peer that is not connected */
1949 if (pr->pcic != NULL)
1951 /* second change before first one is done */
1955 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1958 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1959 sizeof (struct RequestInfoMessage));
1960 cm->cont = &change_preference_send_continuation;
1963 rim = (struct RequestInfoMessage*) &cm[1];
1964 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1965 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1966 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1967 rim->limit_outbound = bw_out;
1968 rim->reserve_inbound = htonl (amount);
1969 rim->preference_change = GNUNET_htonll(preference);
1972 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1973 "Queueing CHANGE PREFERENCE request for peer `%s' with RIM %u\n",
1975 (unsigned int) pr->rim_id);
1977 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1978 h->control_pending_tail,
1981 pr->pcic_cls = info_cls;
1982 pr->pcic_ptr = irc; /* for free'ing irc */
1983 if (NULL != h->client)
1984 trigger_next_request (h, GNUNET_NO);
1990 * Cancel request for getting information about a peer.
1991 * Note that an eventual change in preference, trust or bandwidth
1992 * assignment MAY have already been committed at the time,
1993 * so cancelling a request is NOT sure to undo the original
1994 * request. The original request may or may not still commit.
1995 * The only thing cancellation ensures is that the callback
1996 * from the original request will no longer be called.
1998 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
2001 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
2003 struct GNUNET_CORE_Handle *h = irc->h;
2004 struct PeerRecord *pr = irc->pr;
2006 GNUNET_assert (pr->pcic_ptr == irc);
2007 if (irc->cm != NULL)
2009 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
2010 h->control_pending_tail,
2012 GNUNET_free (irc->cm);
2015 pr->pcic_cls = NULL;
2016 pr->pcic_ptr = NULL;
2021 /* end of core_api.c */