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, const struct GNUNET_SCHEDULER_TaskContext *tc)
387 struct GNUNET_CORE_Handle *h = cls;
389 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
391 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
392 "Connecting to CORE service after delay\n");
399 * Notify clients about disconnect and free
400 * the entry for connected peer.
402 * @param cls the 'struct GNUNET_CORE_Handle*'
403 * @param key the peer identity (not used)
404 * @param value the 'struct PeerRecord' to free.
405 * @return GNUNET_YES (continue)
408 disconnect_and_free_peer_entry (void *cls, const GNUNET_HashCode * key,
411 static struct GNUNET_BANDWIDTH_Value32NBO zero;
412 struct GNUNET_CORE_Handle *h = cls;
413 struct GNUNET_CORE_TransmitHandle *th;
414 struct PeerRecord *pr = value;
415 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
418 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
420 GNUNET_SCHEDULER_cancel (pr->timeout_task);
421 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
423 if (pr->ntr_task != GNUNET_SCHEDULER_NO_TASK)
425 GNUNET_SCHEDULER_cancel (pr->ntr_task);
426 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
428 if ((pr->prev != NULL) || (pr->next != NULL) || (h->ready_peer_head == pr))
429 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head, h->ready_peer_tail, pr);
430 if (h->disconnects != NULL)
431 h->disconnects (h->cls, &pr->peer);
432 /* all requests should have been cancelled, clean up anyway, just in case */
433 GNUNET_break (pr->queue_size == 0);
434 if (NULL != (pcic = pr->pcic))
437 pcic_cls = pr->pcic_cls;
438 GNUNET_CORE_peer_change_preference_cancel (pr->pcic_ptr);
439 pcic (pcic_cls, &pr->peer, zero, 0, GNUNET_TIME_UNIT_FOREVER_REL, 0);
441 while (NULL != (th = pr->pending_head))
444 GNUNET_CONTAINER_DLL_remove (pr->pending_head, pr->pending_tail, th);
450 /* done with 'voluntary' cleanups, now on to normal freeing */
451 GNUNET_assert (GNUNET_YES ==
452 GNUNET_CONTAINER_multihashmap_remove (h->peers, key, pr));
453 GNUNET_assert (pr->pending_head == NULL);
454 GNUNET_assert (pr->pending_tail == NULL);
455 GNUNET_assert (pr->ch = h);
456 GNUNET_assert (pr->queue_size == 0);
457 GNUNET_assert (pr->timeout_task == GNUNET_SCHEDULER_NO_TASK);
458 GNUNET_assert (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK);
465 * Close down any existing connection to the CORE service and
466 * try re-establishing it later.
468 * @param h our handle
471 reconnect_later (struct GNUNET_CORE_Handle *h)
473 struct ControlMessage *cm;
474 struct PeerRecord *pr;
476 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
479 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
482 if (h->client != NULL)
484 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
487 h->currently_down = GNUNET_YES;
488 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
490 GNUNET_SCHEDULER_add_delayed (h->retry_backoff, &reconnect_task, h);
491 while (NULL != (cm = h->control_pending_head))
493 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
494 h->control_pending_tail, cm);
497 if (cm->cont != NULL)
498 cm->cont (cm->cont_cls, GNUNET_NO);
501 GNUNET_CONTAINER_multihashmap_iterate (h->peers,
502 &disconnect_and_free_peer_entry, h);
503 while (NULL != (pr = h->ready_peer_head))
504 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head, h->ready_peer_tail, pr);
505 GNUNET_assert (h->control_pending_head == NULL);
507 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->retry_backoff);
508 h->retry_backoff = GNUNET_TIME_relative_multiply (h->retry_backoff, 2);
513 * Check the list of pending requests, send the next
516 * @param h core handle
517 * @param ignore_currently_down transmit message even if not initialized?
520 trigger_next_request (struct GNUNET_CORE_Handle *h, int ignore_currently_down);
524 * The given request hit its timeout. Remove from the
525 * doubly-linked list and call the respective continuation.
527 * @param cls the transmit handle of the request that timed out
528 * @param tc context, can be NULL (!)
531 transmission_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
535 * Send a control message to the peer asking for transmission
536 * of the message in the given peer record.
538 * @param pr peer to request transmission to
541 request_next_transmission (struct PeerRecord *pr)
543 struct GNUNET_CORE_Handle *h = pr->ch;
544 struct ControlMessage *cm;
545 struct SendMessageRequest *smr;
546 struct GNUNET_CORE_TransmitHandle *th;
548 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
550 GNUNET_SCHEDULER_cancel (pr->timeout_task);
551 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
553 if (NULL == (th = pr->pending_head))
555 trigger_next_request (h, GNUNET_NO);
559 return; /* already done */
560 GNUNET_assert (pr->prev == NULL);
561 GNUNET_assert (pr->next == NULL);
563 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
564 (th->timeout), &transmission_timeout, pr);
565 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
566 sizeof (struct SendMessageRequest));
569 smr = (struct SendMessageRequest *) &cm[1];
570 smr->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND_REQUEST);
571 smr->header.size = htons (sizeof (struct SendMessageRequest));
572 smr->priority = htonl (th->priority);
573 smr->deadline = GNUNET_TIME_absolute_hton (th->timeout);
574 smr->peer = pr->peer;
575 smr->queue_size = htonl (pr->queue_size);
576 smr->size = htons (th->msize);
577 smr->smr_id = htons (th->smr_id = pr->smr_id_gen++);
578 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
579 h->control_pending_tail, cm);
581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
582 "Adding SEND REQUEST for peer `%s' to message queue\n",
583 GNUNET_i2s (&pr->peer));
585 trigger_next_request (h, GNUNET_NO);
590 * The given request hit its timeout. Remove from the
591 * doubly-linked list and call the respective continuation.
593 * @param cls the transmit handle of the request that timed out
594 * @param tc context, can be NULL (!)
597 transmission_timeout (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
599 struct PeerRecord *pr = cls;
600 struct GNUNET_CORE_Handle *h = pr->ch;
601 struct GNUNET_CORE_TransmitHandle *th;
603 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
604 th = pr->pending_head;
605 GNUNET_CONTAINER_DLL_remove (pr->pending_head, pr->pending_tail, th);
607 if ((pr->prev != NULL) || (pr->next != NULL) || (pr == h->ready_peer_head))
609 /* the request that was 'approved' by core was
610 * canceled before it could be transmitted; remove
611 * us from the 'ready' list */
612 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head, h->ready_peer_tail, pr);
615 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
616 "Signalling timeout of request for transmission to CORE service\n");
618 request_next_transmission (pr);
619 GNUNET_assert (0 == th->get_message (th->get_message_cls, 0, NULL));
625 * Transmit the next message to the core service.
628 transmit_message (void *cls, size_t size, void *buf)
630 struct GNUNET_CORE_Handle *h = cls;
631 struct ControlMessage *cm;
632 struct GNUNET_CORE_TransmitHandle *th;
633 struct PeerRecord *pr;
634 struct SendMessage *sm;
635 const struct GNUNET_MessageHeader *hdr;
639 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
644 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
645 "Transmission failed, initiating reconnect\n");
650 /* first check for control messages */
651 if (NULL != (cm = h->control_pending_head))
653 hdr = (const struct GNUNET_MessageHeader *) &cm[1];
654 msize = ntohs (hdr->size);
657 trigger_next_request (h, GNUNET_NO);
661 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
662 "Transmitting control message with %u bytes of type %u to core.\n",
663 (unsigned int) msize, (unsigned int) ntohs (hdr->type));
665 memcpy (buf, hdr, msize);
666 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
667 h->control_pending_tail, cm);
670 if (NULL != cm->cont)
671 cm->cont (cm->cont_cls, GNUNET_OK);
673 trigger_next_request (h, GNUNET_NO);
676 /* now check for 'ready' P2P messages */
677 if (NULL != (pr = h->ready_peer_head))
679 GNUNET_assert (pr->pending_head != NULL);
680 th = pr->pending_head;
681 if (size < th->msize + sizeof (struct SendMessage))
683 trigger_next_request (h, GNUNET_NO);
686 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head, h->ready_peer_tail, pr);
687 GNUNET_CONTAINER_DLL_remove (pr->pending_head, pr->pending_tail, th);
689 if (pr->timeout_task != GNUNET_SCHEDULER_NO_TASK)
691 GNUNET_SCHEDULER_cancel (pr->timeout_task);
692 pr->timeout_task = GNUNET_SCHEDULER_NO_TASK;
695 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
696 "Transmitting SEND request to `%s' with %u bytes.\n",
697 GNUNET_i2s (&pr->peer), (unsigned int) th->msize);
699 sm = (struct SendMessage *) buf;
700 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SEND);
701 sm->priority = htonl (th->priority);
702 sm->deadline = GNUNET_TIME_absolute_hton (th->timeout);
704 sm->cork = htonl ((uint32_t) th->cork);
705 sm->reserved = htonl (0);
707 th->get_message (th->get_message_cls,
708 size - sizeof (struct SendMessage), &sm[1]);
711 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
712 "Transmitting SEND request to `%s' yielded %u bytes.\n",
713 GNUNET_i2s (&pr->peer), ret);
719 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
720 "Size of clients message to peer %s is 0!\n",
721 GNUNET_i2s (&pr->peer));
723 /* client decided to send nothing! */
724 request_next_transmission (pr);
728 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
729 "Produced SEND message to core with %u bytes payload\n",
732 GNUNET_assert (ret >= sizeof (struct GNUNET_MessageHeader));
733 if (ret + sizeof (struct SendMessage) >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
736 request_next_transmission (pr);
739 ret += sizeof (struct SendMessage);
740 sm->header.size = htons (ret);
741 GNUNET_assert (ret <= size);
742 request_next_transmission (pr);
750 * Check the list of pending requests, send the next
753 * @param h core handle
754 * @param ignore_currently_down transmit message even if not initialized?
757 trigger_next_request (struct GNUNET_CORE_Handle *h, int ignore_currently_down)
761 if ((GNUNET_YES == h->currently_down) && (ignore_currently_down == GNUNET_NO))
764 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
765 "Core connection down, not processing queue\n");
772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
773 "Request pending, not processing queue\n");
777 if (h->control_pending_head != NULL)
779 ntohs (((struct GNUNET_MessageHeader *) &h->
780 control_pending_head[1])->size);
781 else if (h->ready_peer_head != NULL)
783 h->ready_peer_head->pending_head->msize + sizeof (struct SendMessage);
787 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
788 "Request queue empty, not processing queue\n");
790 return; /* no pending message */
793 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
794 GNUNET_TIME_UNIT_FOREVER_REL,
795 GNUNET_NO, &transmit_message, h);
800 * Handler for notification messages received from the core.
802 * @param cls our "struct GNUNET_CORE_Handle"
803 * @param msg the message received from the core service
806 main_notify_handler (void *cls, const struct GNUNET_MessageHeader *msg)
808 struct GNUNET_CORE_Handle *h = cls;
809 const struct InitReplyMessage *m;
810 const struct ConnectNotifyMessage *cnm;
811 const struct DisconnectNotifyMessage *dnm;
812 const struct NotifyTrafficMessage *ntm;
813 const struct GNUNET_MessageHeader *em;
814 const struct ConfigurationInfoMessage *cim;
815 const struct PeerStatusNotifyMessage *psnm;
816 const struct SendMessageReady *smr;
817 const struct GNUNET_CORE_MessageHandler *mh;
818 GNUNET_CORE_StartupCallback init;
819 GNUNET_CORE_PeerConfigurationInfoCallback pcic;
820 struct PeerRecord *pr;
821 struct GNUNET_CORE_TransmitHandle *th;
830 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
832 ("Client was disconnected from core service, trying to reconnect.\n"));
836 msize = ntohs (msg->size);
838 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
839 "Processing message of type %u and size %u from core service\n",
840 ntohs (msg->type), msize);
842 switch (ntohs (msg->type))
844 case GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY:
845 if (ntohs (msg->size) != sizeof (struct InitReplyMessage))
851 m = (const struct InitReplyMessage *) msg;
852 GNUNET_break (0 == ntohl (m->reserved));
853 /* start our message processing loop */
854 if (GNUNET_YES == h->currently_down)
856 h->currently_down = GNUNET_NO;
857 trigger_next_request (h, GNUNET_NO);
859 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
860 GNUNET_CRYPTO_hash (&m->publicKey,
861 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded),
863 if (NULL != (init = h->init))
865 /* mark so we don't call init on reconnect */
868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
869 "Connected to core service of peer `%s'.\n",
870 GNUNET_i2s (&h->me));
872 init (h->cls, h, &h->me, &m->publicKey);
877 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
878 "Successfully reconnected to core service.\n");
881 /* fake 'connect to self' */
882 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &h->me.hashPubKey);
883 GNUNET_assert (pr == NULL);
884 pr = GNUNET_malloc (sizeof (struct PeerRecord));
887 GNUNET_assert (GNUNET_YES ==
888 GNUNET_CONTAINER_multihashmap_put (h->peers,
889 &h->me.hashPubKey, pr,
890 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
891 if (NULL != h->connects)
892 h->connects (h->cls, &h->me, NULL);
894 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT:
895 if (msize < sizeof (struct ConnectNotifyMessage))
901 cnm = (const struct ConnectNotifyMessage *) msg;
902 ats_count = ntohl (cnm->ats_count);
904 sizeof (struct ConnectNotifyMessage) +
905 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
906 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR !=
907 ntohl ((&cnm->ats)[ats_count].type)))
914 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
915 "Received notification about connection from `%s'.\n",
916 GNUNET_i2s (&cnm->peer));
918 if (0 == memcmp (&h->me, &cnm->peer, sizeof (struct GNUNET_PeerIdentity)))
920 /* connect to self!? */
924 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &cnm->peer.hashPubKey);
931 pr = GNUNET_malloc (sizeof (struct PeerRecord));
932 pr->peer = cnm->peer;
934 GNUNET_assert (GNUNET_YES ==
935 GNUNET_CONTAINER_multihashmap_put (h->peers,
936 &cnm->peer.hashPubKey, pr,
937 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST));
938 if (NULL != h->connects)
939 h->connects (h->cls, &cnm->peer, &cnm->ats);
941 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT:
942 if (msize != sizeof (struct DisconnectNotifyMessage))
948 dnm = (const struct DisconnectNotifyMessage *) msg;
949 if (0 == memcmp (&h->me, &dnm->peer, sizeof (struct GNUNET_PeerIdentity)))
951 /* connection to self!? */
955 GNUNET_break (0 == ntohl (dnm->reserved));
957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
958 "Received notification about disconnect from `%s'.\n",
959 GNUNET_i2s (&dnm->peer));
961 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &dnm->peer.hashPubKey);
968 trigger = ((pr->prev != NULL) || (pr->next != NULL) ||
969 (h->ready_peer_head == pr));
970 disconnect_and_free_peer_entry (h, &dnm->peer.hashPubKey, pr);
972 trigger_next_request (h, GNUNET_NO);
974 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_STATUS_CHANGE:
975 if (NULL == h->status_events)
980 if (msize < sizeof (struct PeerStatusNotifyMessage))
986 psnm = (const struct PeerStatusNotifyMessage *) msg;
987 if (0 == memcmp (&h->me, &psnm->peer, sizeof (struct GNUNET_PeerIdentity)))
993 ats_count = ntohl (psnm->ats_count);
995 sizeof (struct PeerStatusNotifyMessage) +
996 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)) ||
997 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR !=
998 ntohl ((&psnm->ats)[ats_count].type)))
1001 reconnect_later (h);
1005 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1006 "Received notification about status change by `%s'.\n",
1007 GNUNET_i2s (&psnm->peer));
1009 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &psnm->peer.hashPubKey);
1013 reconnect_later (h);
1016 h->status_events (h->cls, &psnm->peer, psnm->bandwidth_in,
1017 psnm->bandwidth_out,
1018 GNUNET_TIME_absolute_ntoh (psnm->timeout), &psnm->ats);
1020 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND:
1021 if (msize < sizeof (struct NotifyTrafficMessage))
1024 reconnect_later (h);
1027 ntm = (const struct NotifyTrafficMessage *) msg;
1029 ats_count = ntohl (ntm->ats_count);
1031 sizeof (struct NotifyTrafficMessage) +
1032 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) +
1033 sizeof (struct GNUNET_MessageHeader)) ||
1034 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR !=
1035 ntohl ((&ntm->ats)[ats_count].type)))
1038 reconnect_later (h);
1041 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count + 1];
1043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1044 "Received message of type %u and size %u from peer `%4s'\n",
1045 ntohs (em->type), ntohs (em->size), GNUNET_i2s (&ntm->peer));
1047 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &ntm->peer.hashPubKey);
1051 reconnect_later (h);
1054 if ((GNUNET_NO == h->inbound_hdr_only) &&
1056 ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1057 +ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)))
1060 reconnect_later (h);
1063 et = ntohs (em->type);
1064 for (hpos = 0; hpos < h->hcnt; hpos++)
1066 mh = &h->handlers[hpos];
1069 if ((mh->expected_size != ntohs (em->size)) && (mh->expected_size != 0))
1075 h->handlers[hpos].callback (h->cls, &ntm->peer, em, &ntm->ats))
1077 /* error in processing, do not process other messages! */
1081 if (NULL != h->inbound_notify)
1082 h->inbound_notify (h->cls, &ntm->peer, em, &ntm->ats);
1084 case GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND:
1085 if (msize < sizeof (struct NotifyTrafficMessage))
1088 reconnect_later (h);
1091 ntm = (const struct NotifyTrafficMessage *) msg;
1092 if (0 == memcmp (&h->me, &ntm->peer, sizeof (struct GNUNET_PeerIdentity)))
1098 ats_count = ntohl (ntm->ats_count);
1100 sizeof (struct NotifyTrafficMessage) +
1101 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) +
1102 sizeof (struct GNUNET_MessageHeader)) ||
1103 (GNUNET_TRANSPORT_ATS_ARRAY_TERMINATOR !=
1104 ntohl ((&ntm->ats)[ats_count].type)))
1107 reconnect_later (h);
1110 em = (const struct GNUNET_MessageHeader *) &(&ntm->ats)[ats_count + 1];
1111 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &ntm->peer.hashPubKey);
1115 reconnect_later (h);
1119 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1120 "Received notification about transmission to `%s'.\n",
1121 GNUNET_i2s (&ntm->peer));
1123 if ((GNUNET_NO == h->outbound_hdr_only) &&
1125 ntohs (em->size) + sizeof (struct NotifyTrafficMessage) +
1126 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information)))
1129 reconnect_later (h);
1132 if (NULL == h->outbound_notify)
1137 h->outbound_notify (h->cls, &ntm->peer, em, &ntm->ats);
1139 case GNUNET_MESSAGE_TYPE_CORE_SEND_READY:
1140 if (msize != sizeof (struct SendMessageReady))
1143 reconnect_later (h);
1146 smr = (const struct SendMessageReady *) msg;
1147 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &smr->peer.hashPubKey);
1151 reconnect_later (h);
1155 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1156 "Received notification about transmission readiness to `%s'.\n",
1157 GNUNET_i2s (&smr->peer));
1159 if (pr->pending_head == NULL)
1161 /* request must have been cancelled between the original request
1162 * and the response from core, ignore core's readiness */
1166 th = pr->pending_head;
1167 if (ntohs (smr->smr_id) != th->smr_id)
1169 /* READY message is for expired or cancelled message,
1170 * ignore! (we should have already sent another request) */
1173 if ((pr->prev != NULL) || (pr->next != NULL) || (h->ready_peer_head == pr))
1175 /* we should not already be on the ready list... */
1177 reconnect_later (h);
1180 GNUNET_CONTAINER_DLL_insert (h->ready_peer_head, h->ready_peer_tail, pr);
1181 trigger_next_request (h, GNUNET_NO);
1183 case GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO:
1184 if (ntohs (msg->size) != sizeof (struct ConfigurationInfoMessage))
1187 reconnect_later (h);
1190 cim = (const struct ConfigurationInfoMessage *) msg;
1191 if (0 == memcmp (&h->me, &cim->peer, sizeof (struct GNUNET_PeerIdentity)))
1198 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1199 "Received notification about configuration update for `%s' with RIM %u.\n",
1200 GNUNET_i2s (&cim->peer), (unsigned int) ntohl (cim->rim_id));
1202 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &cim->peer.hashPubKey);
1206 reconnect_later (h);
1209 if (pr->rim_id != ntohl (cim->rim_id))
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1213 "Reservation ID mismatch in notification...\n");
1219 GNUNET_free_non_null (pr->pcic_ptr);
1220 pr->pcic_ptr = NULL;
1222 pcic (pr->pcic_cls, &pr->peer, cim->bw_out, ntohl (cim->reserved_amount),
1223 GNUNET_TIME_relative_ntoh (cim->reserve_delay),
1224 GNUNET_ntohll (cim->preference));
1227 reconnect_later (h);
1230 GNUNET_CLIENT_receive (h->client, &main_notify_handler, h,
1231 GNUNET_TIME_UNIT_FOREVER_REL);
1236 * Task executed once we are done transmitting the INIT message.
1237 * Starts our 'receive' loop.
1239 * @param cls the 'struct GNUNET_CORE_Handle'
1240 * @param success were we successful
1243 init_done_task (void *cls, int success)
1245 struct GNUNET_CORE_Handle *h = cls;
1247 if (success == GNUNET_SYSERR)
1248 return; /* shutdown */
1249 if (success == GNUNET_NO)
1252 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1253 "Failed to exchange INIT with core, retrying\n");
1255 if (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1256 reconnect_later (h);
1259 GNUNET_CLIENT_receive (h->client, &main_notify_handler, h,
1260 GNUNET_TIME_UNIT_FOREVER_REL);
1265 * Our current client connection went down. Clean it up
1266 * and try to reconnect!
1268 * @param h our handle to the core service
1271 reconnect (struct GNUNET_CORE_Handle *h)
1273 struct ControlMessage *cm;
1274 struct InitMessage *init;
1281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Reconnecting to CORE service\n");
1283 GNUNET_assert (h->client == NULL);
1284 GNUNET_assert (h->currently_down == GNUNET_YES);
1285 h->client = GNUNET_CLIENT_connect ("core", h->cfg);
1286 if (h->client == NULL)
1288 reconnect_later (h);
1291 msize = h->hcnt * sizeof (uint16_t) + sizeof (struct InitMessage);
1292 cm = GNUNET_malloc (sizeof (struct ControlMessage) + msize);
1293 cm->cont = &init_done_task;
1295 init = (struct InitMessage *) &cm[1];
1296 init->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT);
1297 init->header.size = htons (msize);
1298 opt = GNUNET_CORE_OPTION_SEND_CONNECT | GNUNET_CORE_OPTION_SEND_DISCONNECT;
1299 if (h->status_events != NULL)
1300 opt |= GNUNET_CORE_OPTION_SEND_STATUS_CHANGE;
1301 if (h->inbound_notify != NULL)
1303 if (h->inbound_hdr_only)
1304 opt |= GNUNET_CORE_OPTION_SEND_HDR_INBOUND;
1306 opt |= GNUNET_CORE_OPTION_SEND_FULL_INBOUND;
1308 if (h->outbound_notify != NULL)
1310 if (h->outbound_hdr_only)
1311 opt |= GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND;
1313 opt |= GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND;
1315 init->options = htonl (opt);
1316 ts = (uint16_t *) & init[1];
1317 for (hpos = 0; hpos < h->hcnt; hpos++)
1318 ts[hpos] = htons (h->handlers[hpos].type);
1319 GNUNET_CONTAINER_DLL_insert (h->control_pending_head, h->control_pending_tail,
1321 trigger_next_request (h, GNUNET_YES);
1327 * Connect to the core service. Note that the connection may
1328 * complete (or fail) asynchronously.
1330 * @param cfg configuration to use
1331 * @param queue_size size of the per-peer message queue
1332 * @param cls closure for the various callbacks that follow (including handlers in the handlers array)
1333 * @param init callback to call on timeout or once we have successfully
1334 * connected to the core service; note that timeout is only meaningful if init is not NULL
1335 * @param connects function to call on peer connect, can be NULL
1336 * @param disconnects function to call on peer disconnect / timeout, can be NULL
1337 * @param status_events function to call on changes to peer connection status, can be NULL
1338 * @param inbound_notify function to call for all inbound messages, can be NULL
1339 * @param inbound_hdr_only set to GNUNET_YES if inbound_notify will only read the
1340 * GNUNET_MessageHeader and hence we do not need to give it the full message;
1341 * can be used to improve efficiency, ignored if inbound_notify is NULLL
1342 * @param outbound_notify function to call for all outbound messages, can be NULL
1343 * @param outbound_hdr_only set to GNUNET_YES if outbound_notify will only read the
1344 * GNUNET_MessageHeader and hence we do not need to give it the full message
1345 * can be used to improve efficiency, ignored if outbound_notify is NULLL
1346 * @param handlers callbacks for messages we care about, NULL-terminated
1347 * @return handle to the core service (only useful for disconnect until 'init' is called);
1348 * NULL on error (in this case, init is never called)
1350 struct GNUNET_CORE_Handle *
1351 GNUNET_CORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1352 unsigned int queue_size, void *cls,
1353 GNUNET_CORE_StartupCallback init,
1354 GNUNET_CORE_ConnectEventHandler connects,
1355 GNUNET_CORE_DisconnectEventHandler disconnects,
1356 GNUNET_CORE_PeerStatusEventHandler status_events,
1357 GNUNET_CORE_MessageCallback inbound_notify,
1358 int inbound_hdr_only,
1359 GNUNET_CORE_MessageCallback outbound_notify,
1360 int outbound_hdr_only,
1361 const struct GNUNET_CORE_MessageHandler *handlers)
1363 struct GNUNET_CORE_Handle *h;
1365 h = GNUNET_malloc (sizeof (struct GNUNET_CORE_Handle));
1367 h->queue_size = queue_size;
1370 h->connects = connects;
1371 h->disconnects = disconnects;
1372 h->status_events = status_events;
1373 h->inbound_notify = inbound_notify;
1374 h->outbound_notify = outbound_notify;
1375 h->inbound_hdr_only = inbound_hdr_only;
1376 h->outbound_hdr_only = outbound_hdr_only;
1377 h->handlers = handlers;
1379 h->currently_down = GNUNET_YES;
1380 h->peers = GNUNET_CONTAINER_multihashmap_create (128);
1381 h->retry_backoff = GNUNET_TIME_UNIT_MILLISECONDS;
1382 while (handlers[h->hcnt].callback != NULL)
1384 GNUNET_assert (h->hcnt <
1385 (GNUNET_SERVER_MAX_MESSAGE_SIZE -
1386 sizeof (struct InitMessage)) / sizeof (uint16_t));
1388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting to CORE service\n");
1396 * Disconnect from the core service. This function can only
1397 * be called *after* all pending 'GNUNET_CORE_notify_transmit_ready'
1398 * requests have been explicitly canceled.
1400 * @param handle connection to core to disconnect
1403 GNUNET_CORE_disconnect (struct GNUNET_CORE_Handle *handle)
1405 struct ControlMessage *cm;
1408 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Disconnecting from CORE service\n");
1410 if (handle->cth != NULL)
1412 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->cth);
1415 while (NULL != (cm = handle->control_pending_head))
1417 GNUNET_CONTAINER_DLL_remove (handle->control_pending_head,
1418 handle->control_pending_tail, cm);
1421 if (cm->cont != NULL)
1422 cm->cont (cm->cont_cls, GNUNET_SYSERR);
1425 if (handle->client != NULL)
1427 GNUNET_CLIENT_disconnect (handle->client, GNUNET_NO);
1428 handle->client = NULL;
1430 GNUNET_CONTAINER_multihashmap_iterate (handle->peers,
1431 &disconnect_and_free_peer_entry,
1433 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1435 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1436 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1438 GNUNET_CONTAINER_multihashmap_destroy (handle->peers);
1439 handle->peers = NULL;
1440 GNUNET_break (handle->ready_peer_head == NULL);
1441 GNUNET_free (handle);
1446 * Task that calls 'request_next_transmission'.
1448 * @param cls the 'struct PeerRecord*'
1449 * @param tc scheduler context
1452 run_request_next_transmission (void *cls,
1453 const struct GNUNET_SCHEDULER_TaskContext *tc)
1455 struct PeerRecord *pr = cls;
1457 pr->ntr_task = GNUNET_SCHEDULER_NO_TASK;
1458 request_next_transmission (pr);
1463 * Ask the core to call "notify" once it is ready to transmit the
1464 * given number of bytes to the specified "target". Must only be
1465 * called after a connection to the respective peer has been
1466 * established (and the client has been informed about this).
1468 * @param handle connection to core service
1469 * @param cork is corking allowed for this transmission?
1470 * @param priority how important is the message?
1471 * @param maxdelay how long can the message wait?
1472 * @param target who should receive the message,
1473 * use NULL for this peer (loopback)
1474 * @param notify_size how many bytes of buffer space does notify want?
1475 * @param notify function to call when buffer space is available
1476 * @param notify_cls closure for notify
1477 * @return non-NULL if the notify callback was queued,
1478 * NULL if we can not even queue the request (insufficient
1479 * memory); if NULL is returned, "notify" will NOT be called.
1481 struct GNUNET_CORE_TransmitHandle *
1482 GNUNET_CORE_notify_transmit_ready (struct GNUNET_CORE_Handle *handle, int cork,
1484 struct GNUNET_TIME_Relative maxdelay,
1485 const struct GNUNET_PeerIdentity *target,
1487 GNUNET_CONNECTION_TransmitReadyNotify notify,
1490 struct PeerRecord *pr;
1491 struct GNUNET_CORE_TransmitHandle *th;
1492 struct GNUNET_CORE_TransmitHandle *pos;
1493 struct GNUNET_CORE_TransmitHandle *prev;
1494 struct GNUNET_CORE_TransmitHandle *minp;
1496 pr = GNUNET_CONTAINER_multihashmap_get (handle->peers, &target->hashPubKey);
1499 /* attempt to send to peer that is not connected */
1500 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1501 "Attempting to send to peer `%s' from peer `%s', but not connected!\n",
1502 GNUNET_i2s (target), GNUNET_h2s (&handle->me.hashPubKey));
1506 GNUNET_assert (notify_size + sizeof (struct SendMessage) <
1507 GNUNET_SERVER_MAX_MESSAGE_SIZE);
1508 th = GNUNET_malloc (sizeof (struct GNUNET_CORE_TransmitHandle));
1510 GNUNET_assert (NULL != notify);
1511 th->get_message = notify;
1512 th->get_message_cls = notify_cls;
1513 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1514 th->priority = priority;
1515 th->msize = notify_size;
1517 /* bound queue size */
1518 if (pr->queue_size == handle->queue_size)
1520 /* find lowest-priority entry, but skip the head of the list */
1521 minp = pr->pending_head->next;
1523 while (prev != NULL)
1525 if (prev->priority < minp->priority)
1531 GNUNET_break (handle->queue_size != 0);
1532 GNUNET_break (pr->queue_size == 1);
1535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1536 "Dropping transmission request: cannot drop queue head and limit is one\n");
1540 if (priority <= minp->priority)
1543 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1544 "Dropping transmission request: priority too low\n");
1547 return NULL; /* priority too low */
1549 GNUNET_CONTAINER_DLL_remove (pr->pending_head, pr->pending_tail, minp);
1551 GNUNET_assert (0 == minp->get_message (minp->get_message_cls, 0, NULL));
1555 /* Order entries by deadline, but SKIP 'HEAD' if
1556 * we're in the 'ready_peer_*' DLL */
1557 pos = pr->pending_head;
1558 if ((pr->prev != NULL) || (pr->next != NULL) ||
1559 (pr == handle->ready_peer_head))
1561 GNUNET_assert (pos != NULL);
1562 pos = pos->next; /* skip head */
1565 /* insertion sort */
1567 while ((pos != NULL) && (pos->timeout.abs_value < th->timeout.abs_value))
1572 GNUNET_CONTAINER_DLL_insert_after (pr->pending_head, pr->pending_tail, prev,
1575 /* was the request queue previously empty? */
1577 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmission request added to queue\n");
1579 if ((pr->pending_head == th) && (pr->ntr_task == GNUNET_SCHEDULER_NO_TASK) &&
1580 (pr->next == NULL) && (pr->prev == NULL) &&
1581 (handle->ready_peer_head != pr))
1583 GNUNET_SCHEDULER_add_now (&run_request_next_transmission, pr);
1589 * Cancel the specified transmission-ready notification.
1591 * @param th handle that was returned by "notify_transmit_ready".
1594 GNUNET_CORE_notify_transmit_ready_cancel (struct GNUNET_CORE_TransmitHandle *th)
1596 struct PeerRecord *pr = th->peer;
1597 struct GNUNET_CORE_Handle *h = pr->ch;
1600 was_head = (pr->pending_head == th);
1601 GNUNET_CONTAINER_DLL_remove (pr->pending_head, pr->pending_tail, th);
1605 /* we're currently in the control queue, remove */
1606 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1607 h->control_pending_tail, th->cm);
1608 GNUNET_free (th->cm);
1613 if ((pr->prev != NULL) || (pr->next != NULL) || (pr == h->ready_peer_head))
1615 /* the request that was 'approved' by core was
1616 * canceled before it could be transmitted; remove
1617 * us from the 'ready' list */
1618 GNUNET_CONTAINER_DLL_remove (h->ready_peer_head, h->ready_peer_tail, pr);
1620 request_next_transmission (pr);
1625 /* ****************** GNUNET_CORE_peer_request_connect ******************** */
1628 * Handle for a request to the core to connect to
1629 * a particular peer. Can be used to cancel the request
1630 * (before the 'cont'inuation is called).
1632 struct GNUNET_CORE_PeerRequestHandle
1636 * Link to control message.
1638 struct ControlMessage *cm;
1643 struct GNUNET_CORE_Handle *h;
1646 * Continuation to run when done.
1648 GNUNET_CORE_ControlContinuation cont;
1651 * Closure for 'cont'.
1659 * Continuation called when the control message was transmitted.
1660 * Calls the original continuation and frees the remaining
1663 * @param cls the 'struct GNUNET_CORE_PeerRequestHandle'
1664 * @param success was the request transmitted?
1667 peer_request_connect_cont (void *cls, int success)
1669 struct GNUNET_CORE_PeerRequestHandle *ret = cls;
1671 if (ret->cont != NULL)
1672 ret->cont (ret->cont_cls, success);
1678 * Request that the core should try to connect to a particular peer.
1679 * Once the request has been transmitted to the core, the continuation
1680 * function will be called. Note that this does NOT mean that a
1681 * connection was successfully established -- it only means that the
1682 * core will now try. Successful establishment of the connection
1683 * will be signalled to the 'connects' callback argument of
1684 * 'GNUNET_CORE_connect' only. If the core service does not respond
1685 * to our connection attempt within the given time frame, 'cont' will
1686 * be called with the TIMEOUT reason code.
1688 * @param h core handle
1689 * @param peer who should we connect to
1690 * @param cont function to call once the request has been completed (or timed out)
1691 * @param cont_cls closure for cont
1693 * @return NULL on error or already connected,
1694 * otherwise handle for cancellation
1696 struct GNUNET_CORE_PeerRequestHandle *
1697 GNUNET_CORE_peer_request_connect (struct GNUNET_CORE_Handle *h,
1698 const struct GNUNET_PeerIdentity *peer,
1699 GNUNET_CORE_ControlContinuation cont,
1702 struct GNUNET_CORE_PeerRequestHandle *ret;
1703 struct ControlMessage *cm;
1704 struct ConnectMessage *msg;
1706 if (NULL != GNUNET_CONTAINER_multihashmap_get (h->peers, &peer->hashPubKey))
1709 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Peers are already connected!\n");
1714 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1715 sizeof (struct ConnectMessage));
1716 msg = (struct ConnectMessage *) &cm[1];
1717 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT);
1718 msg->header.size = htons (sizeof (struct ConnectMessage));
1719 msg->reserved = htonl (0);
1721 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1722 h->control_pending_tail, cm);
1723 ret = GNUNET_malloc (sizeof (struct GNUNET_CORE_PeerRequestHandle));
1727 ret->cont_cls = cont_cls;
1728 cm->cont = &peer_request_connect_cont;
1731 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Queueing REQUEST_CONNECT request\n");
1733 trigger_next_request (h, GNUNET_NO);
1739 * Cancel a pending request to connect to a particular peer. Must not
1740 * be called after the 'cont' function was invoked.
1742 * @param req request handle that was returned for the original request
1745 GNUNET_CORE_peer_request_connect_cancel (struct GNUNET_CORE_PeerRequestHandle
1748 struct GNUNET_CORE_Handle *h = req->h;
1749 struct ControlMessage *cm = req->cm;
1752 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1753 "A CHANGE PREFERENCE request was cancelled!\n");
1755 GNUNET_CONTAINER_DLL_remove (h->control_pending_head, h->control_pending_tail,
1762 /* ****************** GNUNET_CORE_peer_change_preference ******************** */
1765 struct GNUNET_CORE_InformationRequestContext
1769 * Our connection to the service.
1771 struct GNUNET_CORE_Handle *h;
1774 * Link to control message, NULL if CM was sent.
1776 struct ControlMessage *cm;
1779 * Link to peer record.
1781 struct PeerRecord *pr;
1786 * CM was sent, remove link so we don't double-free.
1788 * @param cls the 'struct GNUNET_CORE_InformationRequestContext'
1789 * @param success were we successful?
1792 change_preference_send_continuation (void *cls, int success)
1794 struct GNUNET_CORE_InformationRequestContext *irc = cls;
1801 * Obtain statistics and/or change preferences for the given peer.
1803 * @param h core handle
1804 * @param peer identifies the peer
1805 * @param timeout after how long should we give up (and call "info" with NULL
1806 * for "peer" to signal an error)?
1807 * @param bw_out set to the current bandwidth limit (sending) for this peer,
1808 * caller should set "bw_out" to "-1" to avoid changing
1809 * the current value; otherwise "bw_out" will be lowered to
1810 * the specified value; passing a pointer to "0" can be used to force
1811 * us to disconnect from the peer; "bw_out" might not increase
1812 * as specified since the upper bound is generally
1813 * determined by the other peer!
1814 * @param amount reserve N bytes for receiving, negative
1815 * amounts can be used to undo a (recent) reservation;
1816 * @param preference increase incoming traffic share preference by this amount;
1817 * in the absence of "amount" reservations, we use this
1818 * preference value to assign proportional bandwidth shares
1819 * to all connected peers
1820 * @param info function to call with the resulting configuration information
1821 * @param info_cls closure for info
1822 * @return NULL on error
1824 struct GNUNET_CORE_InformationRequestContext *
1825 GNUNET_CORE_peer_change_preference (struct GNUNET_CORE_Handle *h,
1826 const struct GNUNET_PeerIdentity *peer,
1827 struct GNUNET_TIME_Relative timeout,
1828 struct GNUNET_BANDWIDTH_Value32NBO bw_out,
1829 int32_t amount, uint64_t preference,
1830 GNUNET_CORE_PeerConfigurationInfoCallback
1831 info, void *info_cls)
1833 struct GNUNET_CORE_InformationRequestContext *irc;
1834 struct PeerRecord *pr;
1835 struct RequestInfoMessage *rim;
1836 struct ControlMessage *cm;
1838 pr = GNUNET_CONTAINER_multihashmap_get (h->peers, &peer->hashPubKey);
1841 /* attempt to change preference on peer that is not connected */
1845 if (pr->pcic != NULL)
1847 /* second change before first one is done */
1851 irc = GNUNET_malloc (sizeof (struct GNUNET_CORE_InformationRequestContext));
1854 cm = GNUNET_malloc (sizeof (struct ControlMessage) +
1855 sizeof (struct RequestInfoMessage));
1856 cm->cont = &change_preference_send_continuation;
1859 rim = (struct RequestInfoMessage *) &cm[1];
1860 rim->header.size = htons (sizeof (struct RequestInfoMessage));
1861 rim->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO);
1862 rim->rim_id = htonl (pr->rim_id = h->rim_id_gen++);
1863 rim->limit_outbound = bw_out;
1864 rim->reserve_inbound = htonl (amount);
1865 rim->preference_change = GNUNET_htonll (preference);
1868 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1869 "Queueing CHANGE PREFERENCE request for peer `%s' with RIM %u\n",
1870 GNUNET_i2s (peer), (unsigned int) pr->rim_id);
1872 GNUNET_CONTAINER_DLL_insert_tail (h->control_pending_head,
1873 h->control_pending_tail, cm);
1875 pr->pcic_cls = info_cls;
1876 pr->pcic_ptr = irc; /* for free'ing irc */
1877 if (NULL != h->client)
1878 trigger_next_request (h, GNUNET_NO);
1884 * Cancel request for getting information about a peer.
1885 * Note that an eventual change in preference, trust or bandwidth
1886 * assignment MAY have already been committed at the time,
1887 * so cancelling a request is NOT sure to undo the original
1888 * request. The original request may or may not still commit.
1889 * The only thing cancellation ensures is that the callback
1890 * from the original request will no longer be called.
1892 * @param irc context returned by the original GNUNET_CORE_peer_get_info call
1895 GNUNET_CORE_peer_change_preference_cancel (struct
1896 GNUNET_CORE_InformationRequestContext
1899 struct GNUNET_CORE_Handle *h = irc->h;
1900 struct PeerRecord *pr = irc->pr;
1902 GNUNET_assert (pr->pcic_ptr == irc);
1903 if (irc->cm != NULL)
1905 GNUNET_CONTAINER_DLL_remove (h->control_pending_head,
1906 h->control_pending_tail, irc->cm);
1907 GNUNET_free (irc->cm);
1910 pr->pcic_cls = NULL;
1911 pr->pcic_ptr = NULL;
1916 /* end of core_api.c */