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);
493 if (h->client != NULL)
495 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
499 h->currently_down = GNUNET_YES;
500 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
501 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->retry_backoff,
504 while (NULL != (cm = h->control_pending_head))
506 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
507 h->control_pending_tail,
511 if (cm->cont != NULL)
512 cm->cont (cm->cont_cls, GNUNET_NO);
515 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
516 &disconnect_and_free_peer_entry,
518 while (NULL != (pr = h->ready_peer_head))
519 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
522 GNUNET_assert (h->control_pending_head == NULL);
523 h->retry_backoff = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
525 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
530 * Check the list of pending requests, send the next
533 * @param h core handle
534 * @param ignore_currently_down transmit message even if not initialized?
537 trigger_next_request (struct GNUNET_CORE_Handle *h,
538 int ignore_currently_down);
542 * The given request hit its timeout. Remove from the
543 * doubly-linked list and call the respective continuation.
545 * @param cls the transmit handle of the request that timed out
546 * @param tc context, can be NULL (!)
549 transmission_timeout (void *cls,
550 const struct GNUNET_SCHEDULER_TaskContext *tc);
554 * Send a control message to the peer asking for transmission
555 * of the message in the given peer record.
557 * @param pr peer to request transmission to
560 request_next_transmission (struct PeerRecord *pr)
562 struct GNUNET_CORE_Handle *h = pr->ch;
563 struct ControlMessage *cm;
564 struct SendMessageRequest *smr;
565 struct GNUNET_CORE_TransmitHandle *th;
567 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
569 GNUNET_SCHEDULER_cancel (pr->timeout_task);
570 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
572 if (NULL == (th = pr->pending_head))
574 trigger_next_request (h, GNUNET_NO);
578 return; /* already done */
579 GNUNET_assert (pr->prev == NULL);
580 GNUNET_assert (pr->next == NULL);
581 pr->timeout_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining (th->timeout),
582 &transmission_timeout,
584 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
585 sizeof (struct SendMessageRequest));
588 smr = (struct SendMessageRequest*) &cm[1];
589 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
590 smr->header.size = htons (sizeof (struct SendMessageRequest));
591 smr->priority = htonl (th->priority);
592 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
593 smr->peer = pr->peer;
594 smr->queue_size = htonl (pr->queue_size);
595 smr->size = htons (th->msize);
596 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
597 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
598 h->control_pending_tail,
601 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
602 "Adding SEND REQUEST for peer `%s' to message queue\n",
603 GNUNET_i2s (&pr->peer));
605 trigger_next_request (h, GNUNET_NO);
610 * The given request hit its timeout. Remove from the
611 * doubly-linked list and call the respective continuation.
613 * @param cls the transmit handle of the request that timed out
614 * @param tc context, can be NULL (!)
617 transmission_timeout (void *cls,
618 const struct GNUNET_SCHEDULER_TaskContext *tc)
620 struct PeerRecord *pr = cls;
621 struct GNUNET_CORE_Handle *h = pr->ch;
622 struct GNUNET_CORE_TransmitHandle *th;
624 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
625 th = pr->pending_head;
626 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
630 if ( (pr->prev != NULL) ||
631 (pr->next != NULL) ||
632 (pr == h->ready_peer_head) )
634 /* the request that was 'approved' by core was
635 canceled before it could be transmitted; remove
636 us from the 'ready' list */
637 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
643 "Signalling timeout of request for transmission to CORE service\n");
645 request_next_transmission (pr);
646 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
652 * Transmit the next message to the core service.
655 transmit_message (void *cls,
659 struct GNUNET_CORE_Handle *h = cls;
660 struct ControlMessage *cm;
661 struct GNUNET_CORE_TransmitHandle *th;
662 struct PeerRecord *pr;
663 struct SendMessage *sm;
664 const struct GNUNET_MessageHeader *hdr;
668 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
673 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
674 "Transmission failed, initiating reconnect\n");
679 /* first check for control messages */
680 if (NULL != (cm = h->control_pending_head))
682 hdr = (const struct GNUNET_MessageHeader*) &cm[1];
683 msize = ntohs (hdr->size);
686 trigger_next_request (h, GNUNET_NO);
690 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
691 "Transmitting control message with %u bytes of type %u to core.\n",
692 (unsigned int) msize,
693 (unsigned int) ntohs (hdr->type));
695 memcpy (buf, hdr, msize);
696 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
697 h->control_pending_tail,
701 if (NULL != cm->cont)
702 cm->cont (cm->cont_cls, GNUNET_OK);
704 trigger_next_request (h, GNUNET_NO);
707 /* now check for 'ready' P2P messages */
708 if (NULL != (pr = h->ready_peer_head))
710 GNUNET_assert (pr->pending_head != NULL);
711 th = pr->pending_head;
712 if (size < th->msize + sizeof (struct SendMessage))
714 trigger_next_request (h, GNUNET_NO);
717 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
720 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
724 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
726 GNUNET_SCHEDULER_cancel (pr->timeout_task);
727 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
730 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
731 "Transmitting SEND request to `%s' with %u bytes.\n",
732 GNUNET_i2s (&pr->peer),
733 (unsigned int) th->msize);
735 sm = (struct SendMessage *) buf;
736 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
737 sm->priority = htonl (th->priority);
738 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
740 sm->cork = htonl ((uint32_t) th->cork);
741 sm->reserved = htonl (0);
742 ret = th->get_message (th->get_message_cls,
743 size - sizeof (struct SendMessage),
747 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
748 "Transmitting SEND request to `%s' yielded %u bytes.\n",
749 GNUNET_i2s (&pr->peer),
756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
757 "Size of clients message to peer %s is 0!\n",
758 GNUNET_i2s(&pr->peer));
760 /* client decided to send nothing! */
761 request_next_transmission (pr);
765 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
766 "Produced SEND message to core with %u bytes payload\n",
769 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
770 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
773 request_next_transmission (pr);
776 ret += sizeof (struct SendMessage);
777 sm->header.size = htons (ret);
778 GNUNET_assert (ret <= size);
779 request_next_transmission (pr);
787 * Check the list of pending requests, send the next
790 * @param h core handle
791 * @param ignore_currently_down transmit message even if not initialized?
794 trigger_next_request (struct GNUNET_CORE_Handle *h,
795 int ignore_currently_down)
799 if ( (GNUNET_YES == h->currently_down) &&
800 (ignore_currently_down == GNUNET_NO) )
803 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
804 "Core connection down, not processing queue\n");
811 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
812 "Request pending, not processing queue\n");
816 if (h->control_pending_head != NULL)
817 msize = ntohs (((struct GNUNET_MessageHeader*) &h->control_pending_head[1])->size);
818 else if (h->ready_peer_head != NULL)
819 msize = h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
824 "Request queue empty, not processing queue\n");
826 return; /* no pending message */
828 h->cth = GNUNET_CLIENT_notify_transmit_ready (h->client,
830 GNUNET_TIME_UNIT_FOREVER_REL,
832 &transmit_message, h);
837 * Handler for notification messages received from the core.
839 * @param cls our "struct GNUNET_CORE_Handle"
840 * @param msg the message received from the core service
843 main_notify_handler (void *cls,
844 const struct GNUNET_MessageHeader *msg)
846 struct GNUNET_CORE_Handle *h = cls;
847 const struct InitReplyMessage *m;
848 const struct ConnectNotifyMessage *cnm;
849 const struct DisconnectNotifyMessage *dnm;
850 const struct NotifyTrafficMessage *ntm;
851 const struct GNUNET_MessageHeader *em;
852 const struct ConfigurationInfoMessage *cim;
853 const struct PeerStatusNotifyMessage *psnm;
854 const struct SendMessageReady *smr;
855 const struct GNUNET_CORE_MessageHandler *mh;
856 GNUNET_CORE_StartupCallback init;
857 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
858 struct PeerRecord *pr;
859 struct GNUNET_CORE_TransmitHandle *th;
868 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
870 ("Client was disconnected from core service, trying to reconnect.\n"));
874 msize = ntohs (msg->size);
876 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
877 "Processing message of type %u and size %u from core service\n",
878 ntohs (msg->type), msize);
880 switch (ntohs (msg->type))
882 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
883 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
889 m = (const struct InitReplyMessage *) msg;
890 GNUNET_break (0 == ntohl (m->reserved));
891 /* start our message processing loop */
892 if (GNUNET_YES == h->currently_down)
894 h->currently_down = GNUNET_NO;
895 trigger_next_request (h, GNUNET_NO);
897 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
898 GNUNET_CRYPTO_hash (&m->publicKey,
900 GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
902 if (NULL != (init = h->init))
904 /* mark so we don't call init on reconnect */
907 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
908 "Connected to core service of peer `%s'.\n",
909 GNUNET_i2s (&h->me));
911 init (h->cls, h, &h->me, &m->publicKey);
916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
917 "Successfully reconnected to core service.\n");
920 /* fake 'connect to self' */
921 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
923 GNUNET_assert (pr == NULL);
924 pr = GNUNET_malloc (sizeof (struct PeerRecord));
927 GNUNET_assert (GNUNET_YES ==
928 GNUNET_CONTAINER_multihashmap_put (h->peers,
931 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
932 if (NULL != h->connects)
937 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
938 if (msize < sizeof (struct ConnectNotifyMessage))
944 cnm = (const struct ConnectNotifyMessage *) msg;
945 ats_count = ntohl (cnm->ats_count);
946 if ( (msize != sizeof (struct ConnectNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
947 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&cnm->ats)[ats_count].type)) )
954 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
955 "Received notification about connection from `%s'.\n",
956 GNUNET_i2s (&cnm->peer));
958 if (0 == memcmp (&h->me,
960 sizeof (struct GNUNET_PeerIdentity)))
962 /* connect to self!? */
966 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
967 &cnm->peer.hashPubKey);
974 pr = GNUNET_malloc (sizeof (struct PeerRecord));
975 pr->peer = cnm->peer;
977 GNUNET_assert (GNUNET_YES ==
978 GNUNET_CONTAINER_multihashmap_put (h->peers,
979 &cnm->peer.hashPubKey,
981 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
982 if (NULL != h->connects)
987 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
988 if (msize != sizeof (struct DisconnectNotifyMessage))
994 dnm = (const struct DisconnectNotifyMessage *) msg;
995 if (0 == memcmp (&h->me,
997 sizeof (struct GNUNET_PeerIdentity)))
999 /* connection to self!? */
1003 GNUNET_break (0 == ntohl (dnm->reserved));
1005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1006 "Received notification about disconnect from `%s'.\n",
1007 GNUNET_i2s (&dnm->peer));
1009 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1010 &dnm->peer.hashPubKey);
1014 reconnect_later (h);
1017 trigger = ( (pr->prev != NULL) ||
1018 (pr->next != NULL) ||
1019 (h->ready_peer_head == pr) );
1020 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
1022 trigger_next_request (h, GNUNET_NO);
1024 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
1025 if (NULL == h->status_events)
1030 if (msize < sizeof (struct PeerStatusNotifyMessage))
1033 reconnect_later (h);
1036 psnm = (const struct PeerStatusNotifyMessage *) msg;
1037 if (0 == memcmp (&h->me,
1039 sizeof (struct GNUNET_PeerIdentity)))
1045 ats_count = ntohl (psnm->ats_count);
1046 if ( (msize != sizeof (struct PeerStatusNotifyMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
1047 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&psnm->ats)[ats_count].type)) )
1050 reconnect_later (h);
1054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1055 "Received notification about status change by `%s'.\n",
1056 GNUNET_i2s (&psnm->peer));
1058 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1059 &psnm->peer.hashPubKey);
1063 reconnect_later (h);
1066 h->status_events (h->cls,
1069 psnm->bandwidth_out,
1070 GNUNET_TIME_absolute_ntoh (psnm->timeout),
1073 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1074 if (msize < sizeof (struct NotifyTrafficMessage))
1077 reconnect_later (h);
1080 ntm = (const struct NotifyTrafficMessage *) msg;
1082 ats_count = ntohl (ntm->ats_count);
1083 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1084 + sizeof (struct GNUNET_MessageHeader)) ||
1085 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1088 reconnect_later (h);
1091 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1093 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1094 "Received message of type %u and size %u from peer `%4s'\n",
1097 GNUNET_i2s (&ntm->peer));
1099 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1100 &ntm->peer.hashPubKey);
1104 reconnect_later (h);
1107 if ((GNUNET_NO == h->inbound_hdr_only) &&
1108 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1109 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1112 reconnect_later (h);
1115 et = ntohs (em->type);
1116 for (hpos = 0; hpos < h->hcnt; hpos++)
1118 mh = &h->handlers[hpos];
1121 if ((mh->expected_size != ntohs (em->size)) &&
1122 (mh->expected_size != 0))
1128 h->handlers[hpos].callback (h->cls, &ntm->peer, em,
1131 /* error in processing, do not process other messages! */
1135 if (NULL != h->inbound_notify)
1136 h->inbound_notify (h->cls, &ntm->peer, em,
1139 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1140 if (msize < sizeof (struct NotifyTrafficMessage))
1143 reconnect_later (h);
1146 ntm = (const struct NotifyTrafficMessage *) msg;
1147 if (0 == memcmp (&h->me,
1149 sizeof (struct GNUNET_PeerIdentity)))
1155 ats_count = ntohl (ntm->ats_count);
1156 if ( (msize < sizeof (struct NotifyTrafficMessage) + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)
1157 + sizeof (struct GNUNET_MessageHeader)) ||
1158 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR != ntohl ((&ntm->ats)[ats_count].type)) )
1161 reconnect_later (h);
1164 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count+1];
1165 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1166 &ntm->peer.hashPubKey);
1170 reconnect_later (h);
1174 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1175 "Received notification about transmission to `%s'.\n",
1176 GNUNET_i2s (&ntm->peer));
1178 if ((GNUNET_NO == h->outbound_hdr_only) &&
1179 (msize != ntohs (em->size) + sizeof (struct NotifyTrafficMessage)
1180 + ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) )
1183 reconnect_later (h);
1186 if (NULL == h->outbound_notify)
1191 h->outbound_notify (h->cls, &ntm->peer, em,
1194 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1195 if (msize != sizeof (struct SendMessageReady))
1198 reconnect_later (h);
1201 smr = (const struct SendMessageReady *) msg;
1202 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1203 &smr->peer.hashPubKey);
1207 reconnect_later (h);
1211 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1212 "Received notification about transmission readiness to `%s'.\n",
1213 GNUNET_i2s (&smr->peer));
1215 if (pr->pending_head == NULL)
1217 /* request must have been cancelled between the original request
1218 and the response from core, ignore core's readiness */
1222 th = pr->pending_head;
1223 if (ntohs (smr->smr_id) != th->smr_id)
1225 /* READY message is for expired or cancelled message,
1226 ignore! (we should have already sent another request) */
1229 if ( (pr->prev != NULL) ||
1230 (pr->next != NULL) ||
1231 (h->ready_peer_head == pr) )
1233 /* we should not already be on the ready list... */
1235 reconnect_later (h);
1238 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head,
1241 trigger_next_request (h, GNUNET_NO);
1243 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1244 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1247 reconnect_later (h);
1250 cim = (const struct ConfigurationInfoMessage*) msg;
1251 if (0 == memcmp (&h->me,
1253 sizeof (struct GNUNET_PeerIdentity)))
1260 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1261 "Received notification about configuration update for `%s' with RIM %u.\n",
1262 GNUNET_i2s (&cim->peer),
1263 (unsigned int) ntohl (cim->rim_id));
1265 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1266 &cim->peer.hashPubKey);
1270 reconnect_later (h);
1273 if (pr->rim_id != ntohl (cim->rim_id))
1276 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1277 "Reservation ID mismatch in notification...\n");
1283 GNUNET_free_non_null (pr->pcic_ptr);
1284 pr->pcic_ptr = NULL;
1289 ntohl (cim->reserved_amount),
1290 GNUNET_TIME_relative_ntoh (cim->reserve_delay),
1291 GNUNET_ntohll (cim->preference));
1294 reconnect_later (h);
1297 GNUNET_CLIENT_receive (h->client,
1298 &main_notify_handler, h,
1299 GNUNET_TIME_UNIT_FOREVER_REL);
1304 * Task executed once we are done transmitting the INIT message.
1305 * Starts our 'receive' loop.
1307 * @param cls the 'struct GNUNET_CORE_Handle'
1308 * @param success were we successful
1311 init_done_task (void *cls,
1314 struct GNUNET_CORE_Handle *h = cls;
1316 if (success == GNUNET_SYSERR)
1317 return; /* shutdown */
1318 if (success == GNUNET_NO)
1321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1322 "Failed to exchange INIT with core, retrying\n");
1324 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1325 reconnect_later (h);
1328 GNUNET_CLIENT_receive (h->client,
1329 &main_notify_handler,
1331 GNUNET_TIME_UNIT_FOREVER_REL);
1336 * Our current client connection went down. Clean it up
1337 * and try to reconnect!
1339 * @param h our handle to the core service
1342 reconnect (struct GNUNET_CORE_Handle *h)
1344 struct ControlMessage *cm;
1345 struct InitMessage *init;
1352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1353 "Reconnecting to CORE service\n");
1355 GNUNET_assert (h->client == NULL);
1356 GNUNET_assert (h->currently_down == GNUNET_YES);
1357 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1358 if (h->client == NULL)
1360 reconnect_later (h);
1363 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1364 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1366 cm->cont = &init_done_task;
1368 init = (struct InitMessage*) &cm[1];
1369 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1370 init->header.size = htons (msize);
1371 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1372 if (h->status_events != NULL)
1373 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1374 if (h->inbound_notify != NULL)
1376 if (h->inbound_hdr_only)
1377 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1379 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1381 if (h->outbound_notify != NULL)
1383 if (h->outbound_hdr_only)
1384 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1386 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1388 init->options = htonl (opt);
1389 ts = (uint16_t *) &init[1];
1390 for (hpos = 0; hpos < h->hcnt; hpos++)
1391 ts[hpos] = htons (h->handlers[hpos].type);
1392 GNUNET_CONTAINER_DLL_insert (h->control_pending_head,
1393 h->control_pending_tail,
1395 trigger_next_request (h, GNUNET_YES);
1401 * Connect to the core service. Note that the connection may
1402 * complete (or fail) asynchronously.
1404 * @param cfg configuration to use
1405 * @param queue_size size of the per-peer message queue
1406 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1407 * @param init callback to call on timeout or once we have successfully
1408 * connected to the core service; note that timeout is only meaningful if init is not NULL
1409 * @param connects function to call on peer connect, can be NULL
1410 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1411 * @param status_events function to call on changes to peer connection status, can be NULL
1412 * @param inbound_notify function to call for all inbound messages, can be NULL
1413 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1414 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1415 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1416 * @param outbound_notify function to call for all outbound messages, can be NULL
1417 * @param outbound_hdr_only set to GNUNET_YES if outbound_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 outbound_notify is NULLL
1420 * @param handlers callbacks for messages we care about, NULL-terminated
1421 * @return handle to the core service (only useful for disconnect until 'init' is called);
1422 * NULL on error (in this case, init is never called)
1424 struct GNUNET_CORE_Handle *
1425 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1426 unsigned int queue_size,
1428 GNUNET_CORE_StartupCallback init,
1429 GNUNET_CORE_ConnectEventHandler connects,
1430 GNUNET_CORE_DisconnectEventHandler disconnects,
1431 GNUNET_CORE_PeerStatusEventHandler status_events,
1432 GNUNET_CORE_MessageCallback inbound_notify,
1433 int inbound_hdr_only,
1434 GNUNET_CORE_MessageCallback outbound_notify,
1435 int outbound_hdr_only,
1436 const struct GNUNET_CORE_MessageHandler *handlers)
1438 struct GNUNET_CORE_Handle *h;
1440 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1442 h->queue_size = queue_size;
1445 h->connects = connects;
1446 h->disconnects = disconnects;
1447 h->status_events = status_events;
1448 h->inbound_notify = inbound_notify;
1449 h->outbound_notify = outbound_notify;
1450 h->inbound_hdr_only = inbound_hdr_only;
1451 h->outbound_hdr_only = outbound_hdr_only;
1452 h->handlers = handlers;
1454 h->currently_down = GNUNET_YES;
1455 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1456 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1457 while (handlers[h->hcnt].callback != NULL)
1459 GNUNET_assert (h->hcnt <
1460 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1461 sizeof (struct InitMessage)) / sizeof (uint16_t));
1463 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1464 "Connecting to CORE service\n");
1472 * Disconnect from the core service. This function can only
1473 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1474 * requests have been explicitly canceled.
1476 * @param handle connection to core to disconnect
1479 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1481 struct ControlMessage *cm;
1484 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1485 "Disconnecting from CORE service\n");
1487 if (handle->cth != NULL)
1489 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1492 while (NULL != (cm = handle->control_pending_head))
1494 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1495 handle->control_pending_tail,
1499 if (cm->cont != NULL)
1500 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1503 if (handle->client != NULL)
1505 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1506 handle->client = NULL;
1508 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1509 &disconnect_and_free_peer_entry,
1511 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1513 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1514 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1516 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1517 handle->peers = NULL;
1518 GNUNET_break (handle->ready_peer_head == NULL);
1519 GNUNET_free (handle);
1524 * Task that calls 'request_next_transmission'.
1526 * @param cls the 'struct PeerRecord*'
1527 * @param tc scheduler context
1530 run_request_next_transmission (void *cls,
1531 const struct GNUNET_SCHEDULER_TaskContext *tc)
1533 struct PeerRecord *pr = cls;
1535 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
1536 request_next_transmission (pr);
1541 * Ask the core to call "notify" once it is ready to transmit the
1542 * given number of bytes to the specified "target". Must only be
1543 * called after a connection to the respective peer has been
1544 * established (and the client has been informed about this).
1546 * @param handle connection to core service
1547 * @param cork is corking allowed for this transmission?
1548 * @param priority how important is the message?
1549 * @param maxdelay how long can the message wait?
1550 * @param target who should receive the message,
1551 * use NULL for this peer (loopback)
1552 * @param notify_size how many bytes of buffer space does notify want?
1553 * @param notify function to call when buffer space is available
1554 * @param notify_cls closure for notify
1555 * @return non-NULL if the notify callback was queued,
1556 * NULL if we can not even queue the request (insufficient
1557 * memory); if NULL is returned, "notify" will NOT be called.
1559 struct GNUNET_CORE_TransmitHandle *
1560 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle,
1563 struct GNUNET_TIME_Relative maxdelay,
1564 const struct GNUNET_PeerIdentity *target,
1566 GNUNET_CONNECTION_TransmitReadyNotify notify,
1569 struct PeerRecord *pr;
1570 struct GNUNET_CORE_TransmitHandle *th;
1571 struct GNUNET_CORE_TransmitHandle *pos;
1572 struct GNUNET_CORE_TransmitHandle *prev;
1573 struct GNUNET_CORE_TransmitHandle *minp;
1575 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers,
1576 &target->hashPubKey);
1579 /* attempt to send to peer that is not connected */
1580 GNUNET_log(GNUNET_ERROR_TYPE_WARNING,
1581 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1582 GNUNET_i2s(target), GNUNET_h2s(&handle->me.hashPubKey));
1586 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1587 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1588 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1590 GNUNET_assert(NULL != notify);
1591 th->get_message = notify;
1592 th->get_message_cls = notify_cls;
1593 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1594 th->priority = priority;
1595 th->msize = notify_size;
1597 /* bound queue size */
1598 if (pr->queue_size == handle->queue_size)
1600 /* find lowest-priority entry, but skip the head of the list */
1601 minp = pr->pending_head->next;
1603 while (prev != NULL)
1605 if (prev->priority < minp->priority)
1611 GNUNET_break (handle->queue_size != 0);
1612 GNUNET_break (pr->queue_size == 1);
1615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1616 "Dropping transmission request: cannot drop queue head and limit is one\n");
1620 if (priority <= minp->priority)
1623 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1624 "Dropping transmission request: priority too low\n");
1627 return NULL; /* priority too low */
1629 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1634 minp->get_message (minp->get_message_cls,
1639 /* Order entries by deadline, but SKIP 'HEAD' if
1640 we're in the 'ready_peer_*' DLL */
1641 pos = pr->pending_head;
1642 if ( (pr->prev != NULL) ||
1643 (pr->next != NULL) ||
1644 (pr == handle->ready_peer_head) )
1646 GNUNET_assert (pos != NULL);
1647 pos = pos->next; /* skip head */
1650 /* insertion sort */
1652 while ( (pos != NULL) &&
1653 (pos->timeout.abs_value < th->timeout.abs_value) )
1658 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head,
1663 /* was the request queue previously empty? */
1665 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1666 "Transmission request added to queue\n");
1668 if ( (pr->pending_head == th) &&
1669 (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK) &&
1670 (pr->next == NULL) &&
1671 (pr->prev == NULL) &&
1672 (handle->ready_peer_head != pr) )
1673 pr->ntr_task = GNUNET_SCHEDULER_add_now (&run_request_next_transmission, pr);
1679 * Cancel the specified transmission-ready notification.
1681 * @param th handle that was returned by "notify_transmit_ready".
1684 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle
1687 struct PeerRecord *pr = th->peer;
1688 struct GNUNET_CORE_Handle *h = pr->ch;
1691 was_head = (pr->pending_head == th);
1692 GNUNET_CONTAINER_DLL_remove (pr->pending_head,
1698 /* we're currently in the control queue, remove */
1699 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1700 h->control_pending_tail,
1702 GNUNET_free (th->cm);
1707 if ( (pr->prev != NULL) ||
1708 (pr->next != NULL) ||
1709 (pr == h->ready_peer_head) )
1711 /* the request that was 'approved' by core was
1712 canceled before it could be transmitted; remove
1713 us from the 'ready' list */
1714 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head,
1718 request_next_transmission (pr);
1723 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1726 * Handle for a request to the core to connect to
1727 * a particular peer. Can be used to cancel the request
1728 * (before the 'cont'inuation is called).
1730 struct GNUNET_CORE_PeerRequestHandle
1734 * Link to control message.
1736 struct ControlMessage *cm;
1741 struct GNUNET_CORE_Handle *h;
1744 * Continuation to run when done.
1746 GNUNET_CORE_ControlContinuation cont;
1749 * Closure for 'cont'.
1757 * Continuation called when the control message was transmitted.
1758 * Calls the original continuation and frees the remaining
1761 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1762 * @param success was the request transmitted?
1765 peer_request_connect_cont (void *cls,
1768 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1770 if (ret->cont != NULL)
1771 ret->cont (ret->cont_cls, success);
1777 * Request that the core should try to connect to a particular peer.
1778 * Once the request has been transmitted to the core, the continuation
1779 * function will be called. Note that this does NOT mean that a
1780 * connection was successfully established -- it only means that the
1781 * core will now try. Successful establishment of the connection
1782 * will be signalled to the 'connects' callback argument of
1783 * 'GNUNET_CORE_connect' only. If the core service does not respond
1784 * to our connection attempt within the given time frame, 'cont' will
1785 * be called with the TIMEOUT reason code.
1787 * @param h core handle
1788 * @param peer who should we connect to
1789 * @param cont function to call once the request has been completed (or timed out)
1790 * @param cont_cls closure for cont
1792 * @return NULL on error or already connected,
1793 * otherwise handle for cancellation
1795 struct GNUNET_CORE_PeerRequestHandle *
1796 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1797 const struct GNUNET_PeerIdentity * peer,
1798 GNUNET_CORE_ControlContinuation cont,
1801 struct GNUNET_CORE_PeerRequestHandle *ret;
1802 struct ControlMessage *cm;
1803 struct ConnectMessage *msg;
1805 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers,
1809 GNUNET_log(GNUNET_ERROR_TYPE_DEBUG,
1810 "Peers are already connected!\n");
1815 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1816 sizeof (struct ConnectMessage));
1817 msg = (struct ConnectMessage*) &cm[1];
1818 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1819 msg->header.size = htons (sizeof (struct ConnectMessage));
1820 msg->reserved = htonl (0);
1822 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1823 h->control_pending_tail,
1825 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1829 ret->cont_cls = cont_cls;
1830 cm->cont = &peer_request_connect_cont;
1833 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1834 "Queueing REQUEST_CONNECT request\n");
1836 trigger_next_request (h, GNUNET_NO);
1842 * Cancel a pending request to connect to a particular peer. Must not
1843 * be called after the 'cont' function was invoked.
1845 * @param req request handle that was returned for the original request
1848 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle *req)
1850 struct GNUNET_CORE_Handle *h = req->h;
1851 struct ControlMessage *cm = req->cm;
1854 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1855 "A CHANGE PREFERENCE request was cancelled!\n");
1857 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1858 h->control_pending_tail,
1865 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1868 struct GNUNET_CORE_InformationRequestContext
1872 * Our connection to the service.
1874 struct GNUNET_CORE_Handle *h;
1877 * Link to control message, NULL if CM was sent.
1879 struct ControlMessage *cm;
1882 * Link to peer record.
1884 struct PeerRecord *pr;
1889 * CM was sent, remove link so we don't double-free.
1891 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1892 * @param success were we successful?
1895 change_preference_send_continuation (void *cls,
1898 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1905 * Obtain statistics and/or change preferences for the given peer.
1907 * @param h core handle
1908 * @param peer identifies the peer
1909 * @param timeout after how long should we give up (and call "info" with NULL
1910 * for "peer" to signal an error)?
1911 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1912 * caller should set "bw_out" to "-1" to avoid changing
1913 * the current value; otherwise "bw_out" will be lowered to
1914 * the specified value; passing a pointer to "0" can be used to force
1915 * us to disconnect from the peer; "bw_out" might not increase
1916 * as specified since the upper bound is generally
1917 * determined by the other peer!
1918 * @param amount reserve N bytes for receiving, negative
1919 * amounts can be used to undo a (recent) reservation;
1920 * @param preference increase incoming traffic share preference by this amount;
1921 * in the absence of "amount" reservations, we use this
1922 * preference value to assign proportional bandwidth shares
1923 * to all connected peers
1924 * @param info function to call with the resulting configuration information
1925 * @param info_cls closure for info
1926 * @return NULL on error
1928 struct GNUNET_CORE_InformationRequestContext *
1929 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1930 const struct GNUNET_PeerIdentity *peer,
1931 struct GNUNET_TIME_Relative timeout,
1932 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1934 uint64_t preference,
1935 GNUNET_CORE_PeerConfigurationInfoCallback info,
1938 struct GNUNET_CORE_InformationRequestContext *irc;
1939 struct PeerRecord *pr;
1940 struct RequestInfoMessage *rim;
1941 struct ControlMessage *cm;
1943 pr = GNUNET_CONTAINER_multihashmap_get (h->peers,
1947 /* attempt to change preference on peer that is not connected */
1951 if (pr->pcic != NULL)
1953 /* second change before first one is done */
1957 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1960 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1961 sizeof (struct RequestInfoMessage));
1962 cm->cont = &change_preference_send_continuation;
1965 rim = (struct RequestInfoMessage*) &cm[1];
1966 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1967 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1968 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1969 rim->limit_outbound = bw_out;
1970 rim->reserve_inbound = htonl (amount);
1971 rim->preference_change = GNUNET_htonll(preference);
1974 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1975 "Queueing CHANGE PREFERENCE request for peer `%s' with RIM %u\n",
1977 (unsigned int) pr->rim_id);
1979 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1980 h->control_pending_tail,
1983 pr->pcic_cls = info_cls;
1984 pr->pcic_ptr = irc; /* for free'ing irc */
1985 if (NULL != h->client)
1986 trigger_next_request (h, GNUNET_NO);
1992 * Cancel request for getting information about a peer.
1993 * Note that an eventual change in preference, trust or bandwidth
1994 * assignment MAY have already been committed at the time,
1995 * so cancelling a request is NOT sure to undo the original
1996 * request. The original request may or may not still commit.
1997 * The only thing cancellation ensures is that the callback
1998 * from the original request will no longer be called.
2000 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
2003 GNUNET_CORE_peer_change_preference_cancel (struct GNUNET_CORE_InformationRequestContext *irc)
2005 struct GNUNET_CORE_Handle *h = irc->h;
2006 struct PeerRecord *pr = irc->pr;
2008 GNUNET_assert (pr->pcic_ptr == irc);
2009 if (irc->cm != NULL)
2011 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
2012 h->control_pending_tail,
2014 GNUNET_free (irc->cm);
2017 pr->pcic_cls = NULL;
2018 pr->pcic_ptr = NULL;
2023 /* end of core_api.c */