2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
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11 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 General Public License for more details.
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22 * @file transport/transport_api.c
23 * @brief library to access the low-level P2P IO service
24 * @author Christian Grothoff
27 * - adjust testcases to use new 'try connect' style (should be easy, breaks API compatibility!)
28 * - adjust core service to use new 'try connect' style (should be MUCH nicer there as well!)
32 #include "gnunet_bandwidth_lib.h"
33 #include "gnunet_client_lib.h"
34 #include "gnunet_constants.h"
35 #include "gnunet_container_lib.h"
36 #include "gnunet_arm_service.h"
37 #include "gnunet_hello_lib.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_server_lib.h"
40 #include "gnunet_time_lib.h"
41 #include "gnunet_transport_service.h"
42 #include "transport.h"
45 * How large to start with for the hashmap of neighbours.
47 #define STARTING_NEIGHBOURS_SIZE 16
51 * Handle for a message that should be transmitted to the service.
52 * Used for both control messages and normal messages.
54 struct GNUNET_TRANSPORT_TransmitHandle
58 * We keep all requests in a DLL.
60 struct GNUNET_TRANSPORT_TransmitHandle *next;
63 * We keep all requests in a DLL.
65 struct GNUNET_TRANSPORT_TransmitHandle *prev;
68 * Neighbour for this handle, NULL for control messages.
70 struct Neighbour *neighbour;
73 * Function to call when notify_size bytes are available
76 GNUNET_CONNECTION_TransmitReadyNotify notify;
84 * Timeout for this request, 0 for control messages.
86 struct GNUNET_TIME_Absolute timeout;
89 * Task to trigger request timeout if the request is stalled due to
92 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
95 * How many bytes is our notify callback waiting for?
100 * How important is this message? Not used for control messages.
108 * Entry in hash table of all of our current neighbours.
113 * Overall transport handle.
115 struct GNUNET_TRANSPORT_Handle *h;
118 * Active transmit handle or NULL.
120 struct GNUNET_TRANSPORT_TransmitHandle *th;
123 * Identity of this neighbour.
125 struct GNUNET_PeerIdentity id;
128 * Outbound bandwidh tracker.
130 struct GNUNET_BANDWIDTH_Tracker out_tracker;
133 * Entry in our readyness heap (which is sorted by 'next_ready'
134 * value). NULL if there is no pending transmission request for
135 * this neighbour or if we're waiting for 'is_ready' to become
136 * true AFTER the 'out_tracker' suggested that this peer's quota
137 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
138 * we should immediately go back into the heap).
140 struct GNUNET_CONTAINER_HeapNode *hn;
143 * Is this peer currently ready to receive a message?
151 * Linked list of functions to call whenever our HELLO is updated.
157 * This is a doubly linked list.
159 struct HelloWaitList *next;
162 * This is a doubly linked list.
164 struct HelloWaitList *prev;
167 * Callback to call once we got our HELLO.
169 GNUNET_TRANSPORT_HelloUpdateCallback rec;
180 * Handle for the transport service (includes all of the
181 * state for the transport service).
183 struct GNUNET_TRANSPORT_Handle
187 * Closure for the callbacks.
192 * Function to call for received data.
194 GNUNET_TRANSPORT_ReceiveCallback rec;
197 * function to call on connect events
199 GNUNET_TRANSPORT_NotifyConnect nc_cb;
202 * function to call on disconnect events
204 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
207 * Head of DLL of control messages.
209 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
212 * Tail of DLL of control messages.
214 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
217 * The current HELLO message for this peer. Updated
218 * whenever transports change their addresses.
220 struct GNUNET_HELLO_Message *my_hello;
223 * My client connection to the transport service.
225 struct GNUNET_CLIENT_Connection *client;
228 * Handle to our registration with the client for notification.
230 struct GNUNET_CLIENT_TransmitHandle *cth;
233 * Linked list of pending requests for our HELLO.
235 struct HelloWaitList *hwl_head;
238 * Linked list of pending requests for our HELLO.
240 struct HelloWaitList *hwl_tail;
245 const struct GNUNET_CONFIGURATION_Handle *cfg;
248 * Hash map of the current connected neighbours of this peer.
249 * Maps peer identities to 'struct Neighbour' entries.
251 struct GNUNET_CONTAINER_MultiHashMap *neighbours;
254 * Heap sorting peers with pending messages by the timestamps that
255 * specify when we could next send a message to the respective peer.
256 * Excludes control messages (which can always go out immediately).
257 * Maps time stamps to 'struct Neighbour' entries.
259 struct GNUNET_CONTAINER_Heap *ready_heap;
262 * Peer identity as assumed by this process, or all zeros.
264 struct GNUNET_PeerIdentity self;
267 * ID of the task trying to reconnect to the service.
269 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
272 * ID of the task trying to trigger transmission for a peer while
273 * maintaining bandwidth quotas. In use if there are no control
274 * messages and the smallest entry in the 'ready_heap' has a time
275 * stamp in the future.
277 GNUNET_SCHEDULER_TaskIdentifier quota_task;
280 * Delay until we try to reconnect.
282 struct GNUNET_TIME_Relative reconnect_delay;
285 * Should we check that 'self' matches what the service thinks?
286 * (if GNUNET_NO, then 'self' is all zeros!).
293 * Schedule the task to send one message, either from the control
294 * list or the peer message queues to the service.
296 * @param h transport service to schedule a transmission for
299 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
303 * Function that will schedule the job that will try
304 * to connect us again to the client.
306 * @param h transport service to reconnect
309 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
313 * Get the neighbour list entry for the given peer
315 * @param h our context
316 * @param peer peer to look up
317 * @return NULL if no such peer entry exists
319 static struct Neighbour *
320 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
321 const struct GNUNET_PeerIdentity *peer)
323 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
328 * Add neighbour to our list
330 * @return NULL if this API is currently disconnecting from the service
332 static struct Neighbour *
333 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
334 const struct GNUNET_PeerIdentity *pid)
339 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating entry for neighbour `%4s'.\n",
342 n = GNUNET_malloc (sizeof (struct Neighbour));
345 n->is_ready = GNUNET_YES;
346 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
347 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
348 MAX_BANDWIDTH_CARRY_S);
349 GNUNET_assert (GNUNET_OK ==
350 GNUNET_CONTAINER_multihashmap_put (h->neighbours,
352 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
358 * Iterator over hash map entries, for deleting state of a neighbour.
360 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
361 * @param key peer identity
362 * @param value value in the hash map, the neighbour entry to delete
363 * @return GNUNET_YES if we should continue to
368 neighbour_delete (void *cls, const GNUNET_HashCode * key, void *value)
370 struct GNUNET_TRANSPORT_Handle *handle = cls;
371 struct Neighbour *n = value;
373 if (NULL != handle->nd_cb)
374 handle->nd_cb (handle->cls, &n->id);
375 GNUNET_assert (NULL == n->th);
376 GNUNET_assert (NULL == n->hn);
377 GNUNET_assert (GNUNET_YES ==
378 GNUNET_CONTAINER_multihashmap_remove (handle->neighbours, key,
386 * Function we use for handling incoming messages.
388 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
389 * @param msg message received, NULL on timeout or fatal error
392 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
394 struct GNUNET_TRANSPORT_Handle *h = cls;
395 const struct DisconnectInfoMessage *dim;
396 const struct ConnectInfoMessage *cim;
397 const struct InboundMessage *im;
398 const struct GNUNET_MessageHeader *imm;
399 const struct SendOkMessage *okm;
400 struct HelloWaitList *hwl;
401 struct HelloWaitList *next_hwl;
403 struct GNUNET_PeerIdentity me;
407 GNUNET_assert (h->client != NULL);
411 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
412 "Error receiving from transport service, disconnecting temporarily.\n");
414 disconnect_and_schedule_reconnect (h);
417 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
418 GNUNET_TIME_UNIT_FOREVER_REL);
419 size = ntohs (msg->size);
420 switch (ntohs (msg->type))
422 case GNUNET_MESSAGE_TYPE_HELLO:
424 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
430 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
431 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
434 GNUNET_free_non_null (h->my_hello);
436 if (size < sizeof (struct GNUNET_MessageHeader))
441 h->my_hello = GNUNET_malloc (size);
442 memcpy (h->my_hello, msg, size);
446 next_hwl = hwl->next;
447 hwl->rec (hwl->rec_cls,
448 (const struct GNUNET_MessageHeader *) h->my_hello);
452 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
453 if (size < sizeof (struct ConnectInfoMessage))
458 cim = (const struct ConnectInfoMessage *) msg;
459 ats_count = ntohl (cim->ats_count);
461 sizeof (struct ConnectInfoMessage) +
462 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information))
468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
469 "CONNECT", GNUNET_i2s (&cim->id));
471 n = neighbour_find (h, &cim->id);
477 n = neighbour_add (h, &cim->id);
478 if (h->nc_cb != NULL)
479 h->nc_cb (h->cls, &n->id, &cim->ats, ats_count);
481 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
482 if (size != sizeof (struct DisconnectInfoMessage))
487 dim = (const struct DisconnectInfoMessage *) msg;
488 GNUNET_break (ntohl (dim->reserved) == 0);
489 #if DEBUG_TRANSPORT_DISCONNECT
490 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
491 "DISCONNECT", GNUNET_i2s (&dim->peer));
493 n = neighbour_find (h, &dim->peer);
499 neighbour_delete (h, &dim->peer.hashPubKey, n);
501 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
502 if (size != sizeof (struct SendOkMessage))
507 okm = (const struct SendOkMessage *) msg;
509 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
510 "Receiving `%s' message, transmission %s.\n", "SEND_OK",
511 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
513 n = neighbour_find (h, &okm->peer);
516 GNUNET_break (GNUNET_NO == n->is_ready);
517 n->is_ready = GNUNET_YES;
518 if ((n->th != NULL) && (n->hn == NULL))
520 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
521 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
522 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
523 /* we've been waiting for this (congestion, not quota,
524 * caused delayed transmission) */
525 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
526 schedule_transmission (h);
529 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
531 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
534 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
539 im = (const struct InboundMessage *) msg;
540 GNUNET_break (0 == ntohl (im->reserved));
541 ats_count = ntohl (im->ats_count);
542 imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count + 1]);
544 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
545 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
551 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
552 "Received message of type %u from `%4s'.\n", ntohs (imm->type),
553 GNUNET_i2s (&im->peer));
555 n = neighbour_find (h, &im->peer);
562 h->rec (h->cls, &im->peer, imm, &im->ats, ats_count);
565 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
566 _("Received unexpected message of type %u in %s:%u\n"),
567 ntohs (msg->type), __FILE__, __LINE__);
575 * A transmission request could not be satisfied because of
576 * network congestion. Notify the initiator and clean up.
578 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
579 * @param tc scheduler context
582 timeout_request_due_to_congestion (void *cls,
583 const struct GNUNET_SCHEDULER_TaskContext
586 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
587 struct Neighbour *n = th->neighbour;
589 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
590 GNUNET_assert (th == n->th);
591 GNUNET_assert (NULL == n->hn);
593 th->notify (th->notify_cls, 0, NULL);
599 * Transmit message(s) to service.
601 * @param cls handle to transport
602 * @param size number of bytes available in buf
603 * @param buf where to copy the message
604 * @return number of bytes copied to buf
607 transport_notify_ready (void *cls, size_t size, void *buf)
609 struct GNUNET_TRANSPORT_Handle *h = cls;
610 struct GNUNET_TRANSPORT_TransmitHandle *th;
613 struct OutboundMessage obm;
618 GNUNET_assert (NULL != h->client);
622 /* transmission failed */
623 disconnect_and_schedule_reconnect (h);
629 /* first send control messages */
630 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
632 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
633 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
635 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
636 "Added %u bytes of control message at %u\n", nret, ret);
643 /* then, if possible and no control messages pending, send data messages */
644 while ((NULL == h->control_head) &&
645 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
647 if (GNUNET_YES != n->is_ready)
649 /* peer not ready, wait for notification! */
650 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
652 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
653 n->th->timeout_task =
654 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
656 &timeout_request_due_to_congestion,
661 if (th->notify_size + sizeof (struct OutboundMessage) > size)
662 break; /* does not fit */
663 if (GNUNET_BANDWIDTH_tracker_get_delay
664 (&n->out_tracker, th->notify_size).rel_value > 0)
665 break; /* too early */
666 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
669 n->is_ready = GNUNET_NO;
670 GNUNET_assert (size >= sizeof (struct OutboundMessage));
672 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
673 &cbuf[ret + sizeof (struct OutboundMessage)]);
674 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
677 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
678 GNUNET_SERVER_MAX_MESSAGE_SIZE);
679 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
680 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
681 obm.priority = htonl (th->priority);
683 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
686 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
687 ret += (mret + sizeof (struct OutboundMessage));
688 size -= (mret + sizeof (struct OutboundMessage));
689 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
693 /* if there are more pending messages, try to schedule those */
694 schedule_transmission (h);
696 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
697 "Transmitting %u bytes to transport service\n", ret);
704 * Schedule the task to send one message, either from the control
705 * list or the peer message queues to the service.
707 * @param cls transport service to schedule a transmission for
708 * @param tc scheduler context
711 schedule_transmission_task (void *cls,
712 const struct GNUNET_SCHEDULER_TaskContext *tc)
714 struct GNUNET_TRANSPORT_Handle *h = cls;
716 struct GNUNET_TRANSPORT_TransmitHandle *th;
719 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
720 GNUNET_assert (NULL != h->client);
721 /* destroy all requests that have timed out */
722 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
723 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
725 /* notify client that the request could not be satisfied within
726 * the given time constraints */
729 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
732 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
733 "Signalling timeout for transmission to peer %s due to congestion\n",
734 GNUNET_i2s (&n->id));
736 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
741 if (NULL != h->control_head)
743 size = h->control_head->notify_size;
747 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
749 return; /* no pending messages */
750 size = n->th->notify_size + sizeof (struct OutboundMessage);
753 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
756 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
757 GNUNET_TIME_UNIT_FOREVER_REL,
758 GNUNET_NO, &transport_notify_ready,
760 GNUNET_assert (NULL != h->cth);
765 * Schedule the task to send one message, either from the control
766 * list or the peer message queues to the service.
768 * @param h transport service to schedule a transmission for
771 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
773 struct GNUNET_TIME_Relative delay;
776 GNUNET_assert (NULL != h->client);
777 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
779 GNUNET_SCHEDULER_cancel (h->quota_task);
780 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
782 if (NULL != h->control_head)
783 delay = GNUNET_TIME_UNIT_ZERO;
784 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
786 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
789 return; /* no work to be done */
790 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
791 "Scheduling next transmission to service in %llu ms\n",
792 (unsigned long long) delay.rel_value);
794 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
799 * Queue control request for transmission to the transport
802 * @param h handle to the transport service
803 * @param size number of bytes to be transmitted
804 * @param notify function to call to get the content
805 * @param notify_cls closure for notify
808 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
809 GNUNET_CONNECTION_TransmitReadyNotify notify,
812 struct GNUNET_TRANSPORT_TransmitHandle *th;
815 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
816 "Control transmit of %u bytes requested\n", size);
818 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
820 th->notify_cls = notify_cls;
821 th->notify_size = size;
822 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
823 schedule_transmission (h);
828 * Transmit START message to service.
831 * @param size number of bytes available in buf
832 * @param buf where to copy the message
833 * @return number of bytes copied to buf
836 send_start (void *cls, size_t size, void *buf)
838 struct GNUNET_TRANSPORT_Handle *h = cls;
839 struct StartMessage s;
843 /* Can only be shutdown, just give up */
845 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
846 "Shutdown while trying to transmit `%s' request.\n", "START");
851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
853 GNUNET_assert (size >= sizeof (struct StartMessage));
854 s.header.size = htons (sizeof (struct StartMessage));
855 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
856 s.do_check = htonl (h->check_self);
858 memcpy (buf, &s, sizeof (struct StartMessage));
859 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
860 GNUNET_TIME_UNIT_FOREVER_REL);
861 return sizeof (struct StartMessage);
866 * Try again to connect to transport service.
868 * @param cls the handle to the transport service
869 * @param tc scheduler context
872 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
874 struct GNUNET_TRANSPORT_Handle *h = cls;
876 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
877 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
879 /* shutdown, just give up */
883 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
885 GNUNET_assert (h->client == NULL);
886 GNUNET_assert (h->control_head == NULL);
887 GNUNET_assert (h->control_tail == NULL);
888 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
889 GNUNET_assert (h->client != NULL);
890 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
895 * Function that will schedule the job that will try
896 * to connect us again to the client.
898 * @param h transport service to reconnect
901 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
903 struct GNUNET_TRANSPORT_TransmitHandle *th;
905 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
906 /* Forget about all neighbours that we used to be connected to */
907 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
910 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
913 if (NULL != h->client)
915 GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
918 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
920 GNUNET_SCHEDULER_cancel (h->quota_task);
921 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
923 while ((NULL != (th = h->control_head)))
925 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
926 th->notify (th->notify_cls, 0, NULL);
930 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
931 "Scheduling task to reconnect to transport service in %llu ms.\n",
932 h->reconnect_delay.rel_value);
935 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
936 if (h->reconnect_delay.rel_value == 0)
938 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
942 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
944 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->reconnect_delay);
950 * Closure for 'send_set_quota'.
952 struct SetQuotaContext
956 * Identity of the peer impacted by the quota change.
958 struct GNUNET_PeerIdentity target;
963 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
968 * Send SET_QUOTA message to the service.
970 * @param cls the 'struct SetQuotaContext'
971 * @param size number of bytes available in buf
972 * @param buf where to copy the message
973 * @return number of bytes copied to buf
976 send_set_quota (void *cls, size_t size, void *buf)
978 struct SetQuotaContext *sqc = cls;
979 struct QuotaSetMessage msg;
987 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
988 "Transmitting `%s' request with respect to `%4s'.\n", "SET_QUOTA",
989 GNUNET_i2s (&sqc->target));
991 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
992 msg.header.size = htons (sizeof (struct QuotaSetMessage));
993 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
994 msg.quota = sqc->quota_in;
995 msg.peer = sqc->target;
996 memcpy (buf, &msg, sizeof (msg));
998 return sizeof (struct QuotaSetMessage);
1003 * Set the share of incoming bandwidth for the given
1004 * peer to the specified amount.
1006 * @param handle connection to transport service
1007 * @param target who's bandwidth quota is being changed
1008 * @param quota_in incoming bandwidth quota in bytes per ms
1009 * @param quota_out outgoing bandwidth quota in bytes per ms
1012 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
1013 const struct GNUNET_PeerIdentity *target,
1014 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
1015 struct GNUNET_BANDWIDTH_Value32NBO quota_out)
1017 struct Neighbour *n;
1018 struct SetQuotaContext *sqc;
1020 n = neighbour_find (handle, target);
1023 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1024 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
1025 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1028 GNUNET_assert (NULL != handle->client);
1030 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
1031 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1032 "Quota changed from %u to %u for peer `%s'\n",
1033 (unsigned int) n->out_tracker.available_bytes_per_s__,
1034 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Quota remains at %u for peer `%s'\n",
1037 (unsigned int) n->out_tracker.available_bytes_per_s__,
1038 GNUNET_i2s (target));
1040 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, quota_out);
1041 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
1042 sqc->target = *target;
1043 sqc->quota_in = quota_in;
1044 schedule_control_transmit (handle, sizeof (struct QuotaSetMessage),
1045 &send_set_quota, sqc);
1050 * Send REQUEST_CONNECT message to the service.
1052 * @param cls the 'struct GNUNET_PeerIdentity'
1053 * @param size number of bytes available in buf
1054 * @param buf where to copy the message
1055 * @return number of bytes copied to buf
1058 send_try_connect (void *cls, size_t size, void *buf)
1060 struct GNUNET_PeerIdentity *pid = cls;
1061 struct TransportRequestConnectMessage msg;
1069 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1070 "Transmitting `%s' request with respect to `%4s'.\n",
1071 "REQUEST_CONNECT", GNUNET_i2s (pid));
1073 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1074 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1075 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1076 msg.reserved = htonl (0);
1078 memcpy (buf, &msg, sizeof (msg));
1080 return sizeof (struct TransportRequestConnectMessage);
1085 * Ask the transport service to establish a connection to
1088 * @param handle connection to transport service
1089 * @param target who we should try to connect to
1092 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1093 const struct GNUNET_PeerIdentity *target)
1095 struct GNUNET_PeerIdentity *pid;
1097 if (NULL == handle->client)
1099 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1101 schedule_control_transmit (handle,
1102 sizeof (struct TransportRequestConnectMessage),
1103 &send_try_connect, pid);
1108 * Send HELLO message to the service.
1110 * @param cls the HELLO message to send
1111 * @param size number of bytes available in buf
1112 * @param buf where to copy the message
1113 * @return number of bytes copied to buf
1116 send_hello (void *cls, size_t size, void *buf)
1118 struct GNUNET_MessageHeader *msg = cls;
1123 #if DEBUG_TRANSPORT_TIMEOUT
1124 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1125 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1133 ssize = ntohs (msg->size);
1134 GNUNET_assert (size >= ssize);
1135 memcpy (buf, msg, ssize);
1142 * Offer the transport service the HELLO of another peer. Note that
1143 * the transport service may just ignore this message if the HELLO is
1144 * malformed or useless due to our local configuration.
1146 * @param handle connection to transport service
1147 * @param hello the hello message
1148 * @param cont continuation to call when HELLO has been sent
1149 * @param cls closure for continuation
1153 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1154 const struct GNUNET_MessageHeader *hello,
1155 GNUNET_SCHEDULER_Task cont, void *cls)
1158 struct GNUNET_PeerIdentity peer;
1159 struct GNUNET_MessageHeader *msg;
1161 if (NULL == handle->client)
1163 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1164 size = ntohs (hello->size);
1165 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1167 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1172 msg = GNUNET_malloc (size);
1173 memcpy (msg, hello, size);
1175 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1176 "Offering `%s' message of `%4s' to transport for validation.\n",
1177 "HELLO", GNUNET_i2s (&peer));
1179 schedule_control_transmit (handle, size, &send_hello, msg);
1184 * Obtain the HELLO message for this peer.
1186 * @param handle connection to transport service
1187 * @param rec function to call with the HELLO, sender will be our peer
1188 * identity; message and sender will be NULL on timeout
1189 * (handshake with transport service pending/failed).
1190 * cost estimate will be 0.
1191 * @param rec_cls closure for rec
1194 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1195 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1198 struct HelloWaitList *hwl;
1200 hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
1202 hwl->rec_cls = rec_cls;
1203 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1204 if (handle->my_hello == NULL)
1206 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1211 * Stop receiving updates about changes to our HELLO message.
1213 * @param handle connection to transport service
1214 * @param rec function previously registered to be called with the HELLOs
1215 * @param rec_cls closure for rec
1218 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
1219 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1222 struct HelloWaitList *pos;
1224 pos = handle->hwl_head;
1227 if ((pos->rec == rec) && (pos->rec_cls == rec_cls))
1231 GNUNET_break (pos != NULL);
1234 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, pos);
1240 * Connect to the transport service. Note that the connection may
1241 * complete (or fail) asynchronously.
1243 * @param cfg configuration to use
1244 * @param self our own identity (API should check that it matches
1245 * the identity found by transport), or NULL (no check)
1246 * @param cls closure for the callbacks
1247 * @param rec receive function to call
1248 * @param nc function to call on connect events
1249 * @param nd function to call on disconnect events
1251 struct GNUNET_TRANSPORT_Handle *
1252 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1253 const struct GNUNET_PeerIdentity *self, void *cls,
1254 GNUNET_TRANSPORT_ReceiveCallback rec,
1255 GNUNET_TRANSPORT_NotifyConnect nc,
1256 GNUNET_TRANSPORT_NotifyDisconnect nd)
1258 struct GNUNET_TRANSPORT_Handle *ret;
1260 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1264 ret->check_self = GNUNET_YES;
1271 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1273 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE);
1275 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1276 ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
1282 * Disconnect from the transport service.
1284 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1287 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1292 /* this disconnects all neighbours... */
1293 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1294 disconnect_and_schedule_reconnect (handle);
1295 /* and now we stop trying to connect again... */
1296 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1298 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1299 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1301 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1302 handle->neighbours = NULL;
1303 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1305 GNUNET_SCHEDULER_cancel (handle->quota_task);
1306 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1308 GNUNET_free_non_null (handle->my_hello);
1309 handle->my_hello = NULL;
1310 GNUNET_assert (handle->hwl_head == NULL);
1311 GNUNET_assert (handle->hwl_tail == NULL);
1312 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1313 handle->ready_heap = NULL;
1314 GNUNET_free (handle);
1319 * Check if we could queue a message of the given size for
1320 * transmission. The transport service will take both its
1321 * internal buffers and bandwidth limits imposed by the
1322 * other peer into consideration when answering this query.
1324 * @param handle connection to transport service
1325 * @param target who should receive the message
1326 * @param size how big is the message we want to transmit?
1327 * @param priority how important is the message?
1328 * @param timeout after how long should we give up (and call
1329 * notify with buf NULL and size 0)?
1330 * @param notify function to call when we are ready to
1331 * send such a message
1332 * @param notify_cls closure for notify
1333 * @return NULL if someone else is already waiting to be notified
1334 * non-NULL if the notify callback was queued (can be used to cancel
1335 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1337 struct GNUNET_TRANSPORT_TransmitHandle *
1338 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1339 const struct GNUNET_PeerIdentity
1340 *target, size_t size, uint32_t priority,
1341 struct GNUNET_TIME_Relative timeout,
1342 GNUNET_CONNECTION_TransmitReadyNotify
1343 notify, void *notify_cls)
1345 struct Neighbour *n;
1346 struct GNUNET_TRANSPORT_TransmitHandle *th;
1347 struct GNUNET_TIME_Relative delay;
1349 n = neighbour_find (handle, target);
1352 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1353 * once a connection has been established */
1359 /* attempt to send two messages at the same time to the same peer */
1363 GNUNET_assert (NULL == n->hn);
1364 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1366 th->notify = notify;
1367 th->notify_cls = notify_cls;
1368 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1369 th->notify_size = size;
1370 th->priority = priority;
1372 /* calculate when our transmission should be ready */
1373 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1374 if (delay.rel_value > timeout.rel_value)
1375 delay.rel_value = 0; /* notify immediately (with failure) */
1377 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1378 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1379 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1381 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1382 schedule_transmission (handle);
1388 * Cancel the specified transmission-ready notification.
1390 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1393 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1394 GNUNET_TRANSPORT_TransmitHandle
1397 struct Neighbour *n;
1399 GNUNET_assert (NULL == th->next);
1400 GNUNET_assert (NULL == th->prev);
1402 GNUNET_assert (th == n->th);
1406 GNUNET_CONTAINER_heap_remove_node (n->hn);
1411 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1412 GNUNET_SCHEDULER_cancel (th->timeout_task);
1413 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1419 /* end of transport_api.c */