2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
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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
298 static void schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
302 * Function that will schedule the job that will try
303 * to connect us again to the client.
305 * @param h transport service to reconnect
308 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
312 * Get the neighbour list entry for the given peer
314 * @param h our context
315 * @param peer peer to look up
316 * @return NULL if no such peer entry exists
318 static struct Neighbour *
319 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
320 const struct GNUNET_PeerIdentity *peer)
322 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
327 * Add neighbour to our list
329 * @return NULL if this API is currently disconnecting from the service
331 static struct Neighbour *
332 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
333 const struct GNUNET_PeerIdentity *pid)
338 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
339 "Creating entry for neighbour `%4s'.\n", GNUNET_i2s (pid));
341 n = GNUNET_malloc (sizeof (struct Neighbour));
344 n->is_ready = GNUNET_YES;
345 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
346 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
347 MAX_BANDWIDTH_CARRY_S);
348 GNUNET_assert (GNUNET_OK ==
349 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,
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,
418 &demultiplexer, h, 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",
432 "HELLO", GNUNET_i2s (&me));
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,
469 "Receiving `%s' message for `%4s'.\n",
470 "CONNECT", GNUNET_i2s (&cim->id));
472 n = neighbour_find (h, &cim->id);
478 n = neighbour_add (h, &cim->id);
479 if (h->nc_cb != NULL)
480 h->nc_cb (h->cls, &n->id, &cim->ats, ats_count);
482 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
483 if (size != sizeof (struct DisconnectInfoMessage))
488 dim = (const struct DisconnectInfoMessage *) msg;
489 GNUNET_break (ntohl (dim->reserved) == 0);
490 #if DEBUG_TRANSPORT_DISCONNECT
491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
492 "Receiving `%s' message for `%4s'.\n",
493 "DISCONNECT", GNUNET_i2s (&dim->peer));
495 n = neighbour_find (h, &dim->peer);
501 neighbour_delete (h, &dim->peer.hashPubKey, n);
503 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
504 if (size != sizeof (struct SendOkMessage))
509 okm = (const struct SendOkMessage *) msg;
511 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
512 "Receiving `%s' message, transmission %s.\n", "SEND_OK",
513 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
515 n = neighbour_find (h, &okm->peer);
518 GNUNET_break (GNUNET_NO == n->is_ready);
519 n->is_ready = GNUNET_YES;
520 if ((n->th != NULL) && (n->hn == NULL))
522 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
523 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
524 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
525 /* we've been waiting for this (congestion, not quota,
526 * caused delayed transmission) */
527 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
528 schedule_transmission (h);
531 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
533 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
536 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
541 im = (const struct InboundMessage *) msg;
542 GNUNET_break (0 == ntohl (im->reserved));
543 ats_count = ntohl (im->ats_count);
544 imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count + 1]);
546 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
547 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
553 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
554 "Received message of type %u from `%4s'.\n",
555 ntohs (imm->type), GNUNET_i2s (&im->peer));
557 n = neighbour_find (h, &im->peer);
564 h->rec (h->cls, &im->peer, imm, &im->ats, ats_count);
567 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
569 ("Received unexpected message of type %u in %s:%u\n"),
570 ntohs (msg->type), __FILE__, __LINE__);
578 * A transmission request could not be satisfied because of
579 * network congestion. Notify the initiator and clean up.
581 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
582 * @param tc scheduler context
585 timeout_request_due_to_congestion (void *cls,
586 const struct GNUNET_SCHEDULER_TaskContext
589 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
590 struct Neighbour *n = th->neighbour;
592 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
593 GNUNET_assert (th == n->th);
594 GNUNET_assert (NULL == n->hn);
596 th->notify (th->notify_cls, 0, NULL);
602 * Transmit message(s) to service.
604 * @param cls handle to transport
605 * @param size number of bytes available in buf
606 * @param buf where to copy the message
607 * @return number of bytes copied to buf
610 transport_notify_ready (void *cls, size_t size, void *buf)
612 struct GNUNET_TRANSPORT_Handle *h = cls;
613 struct GNUNET_TRANSPORT_TransmitHandle *th;
616 struct OutboundMessage obm;
621 GNUNET_assert (NULL != h->client);
625 /* transmission failed */
626 disconnect_and_schedule_reconnect (h);
632 /* first send control messages */
633 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
635 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
636 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
639 "Added %u bytes of control message at %u\n", nret, ret);
646 /* then, if possible and no control messages pending, send data messages */
647 while ((NULL == h->control_head) &&
648 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
650 if (GNUNET_YES != n->is_ready)
652 /* peer not ready, wait for notification! */
653 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
655 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
656 n->th->timeout_task =
657 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
659 &timeout_request_due_to_congestion,
664 if (th->notify_size + sizeof (struct OutboundMessage) > size)
665 break; /* does not fit */
666 if (GNUNET_BANDWIDTH_tracker_get_delay
667 (&n->out_tracker, th->notify_size).rel_value > 0)
668 break; /* too early */
669 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
672 n->is_ready = GNUNET_NO;
673 GNUNET_assert (size >= sizeof (struct OutboundMessage));
674 mret = th->notify (th->notify_cls,
675 size - sizeof (struct OutboundMessage),
676 &cbuf[ret + sizeof (struct OutboundMessage)]);
677 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
680 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
681 GNUNET_SERVER_MAX_MESSAGE_SIZE);
682 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
683 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
684 obm.priority = htonl (th->priority);
686 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
689 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
690 ret += (mret + sizeof (struct OutboundMessage));
691 size -= (mret + sizeof (struct OutboundMessage));
692 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
696 /* if there are more pending messages, try to schedule those */
697 schedule_transmission (h);
699 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
700 "Transmitting %u bytes to transport service\n", ret);
707 * Schedule the task to send one message, either from the control
708 * list or the peer message queues to the service.
710 * @param cls transport service to schedule a transmission for
711 * @param tc scheduler context
714 schedule_transmission_task (void *cls,
715 const struct GNUNET_SCHEDULER_TaskContext *tc)
717 struct GNUNET_TRANSPORT_Handle *h = cls;
719 struct GNUNET_TRANSPORT_TransmitHandle *th;
722 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
723 GNUNET_assert (NULL != h->client);
724 /* destroy all requests that have timed out */
725 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
726 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
728 /* notify client that the request could not be satisfied within
729 * the given time constraints */
732 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
735 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
736 "Signalling timeout for transmission to peer %s due to congestion\n",
737 GNUNET_i2s (&n->id));
739 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
744 if (NULL != h->control_head)
746 size = h->control_head->notify_size;
750 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
752 return; /* no pending messages */
753 size = n->th->notify_size + sizeof (struct OutboundMessage);
756 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
759 GNUNET_CLIENT_notify_transmit_ready (h->client,
761 GNUNET_TIME_UNIT_FOREVER_REL,
763 &transport_notify_ready, h);
764 GNUNET_assert (NULL != h->cth);
769 * Schedule the task to send one message, either from the control
770 * list or the peer message queues to the service.
772 * @param h transport service to schedule a transmission for
775 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
777 struct GNUNET_TIME_Relative delay;
780 GNUNET_assert (NULL != h->client);
781 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
783 GNUNET_SCHEDULER_cancel (h->quota_task);
784 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
786 if (NULL != h->control_head)
787 delay = GNUNET_TIME_UNIT_ZERO;
788 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
790 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
793 return; /* no work to be done */
794 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
795 "Scheduling next transmission to service in %llu ms\n",
796 (unsigned long long) delay.rel_value);
797 h->quota_task = GNUNET_SCHEDULER_add_delayed (delay,
798 &schedule_transmission_task, h);
803 * Queue control request for transmission to the transport
806 * @param h handle to the transport service
807 * @param size number of bytes to be transmitted
808 * @param notify function to call to get the content
809 * @param notify_cls closure for notify
812 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
814 GNUNET_CONNECTION_TransmitReadyNotify notify,
817 struct GNUNET_TRANSPORT_TransmitHandle *th;
820 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
821 "Control transmit of %u bytes requested\n", size);
823 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
825 th->notify_cls = notify_cls;
826 th->notify_size = size;
827 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
828 schedule_transmission (h);
833 * Transmit START message to service.
836 * @param size number of bytes available in buf
837 * @param buf where to copy the message
838 * @return number of bytes copied to buf
841 send_start (void *cls, size_t size, void *buf)
843 struct GNUNET_TRANSPORT_Handle *h = cls;
844 struct StartMessage s;
848 /* Can only be shutdown, just give up */
850 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
851 "Shutdown while trying to transmit `%s' request.\n", "START");
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
858 GNUNET_assert (size >= sizeof (struct StartMessage));
859 s.header.size = htons (sizeof (struct StartMessage));
860 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
861 s.do_check = htonl (h->check_self);
863 memcpy (buf, &s, sizeof (struct StartMessage));
864 GNUNET_CLIENT_receive (h->client,
865 &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
866 return sizeof (struct StartMessage);
871 * Try again to connect to transport service.
873 * @param cls the handle to the transport service
874 * @param tc scheduler context
877 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
879 struct GNUNET_TRANSPORT_Handle *h = cls;
881 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
882 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
884 /* shutdown, just give up */
888 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
890 GNUNET_assert (h->client == NULL);
891 GNUNET_assert (h->control_head == NULL);
892 GNUNET_assert (h->control_tail == NULL);
893 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
894 GNUNET_assert (h->client != NULL);
895 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
900 * Function that will schedule the job that will try
901 * to connect us again to the client.
903 * @param h transport service to reconnect
906 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
908 struct GNUNET_TRANSPORT_TransmitHandle *th;
910 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
911 /* Forget about all neighbours that we used to be connected to */
912 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
915 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
918 if (NULL != h->client)
920 GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
923 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
925 GNUNET_SCHEDULER_cancel (h->quota_task);
926 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
928 while ((NULL != (th = h->control_head)))
930 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
931 th->notify (th->notify_cls, 0, NULL);
935 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
936 "Scheduling task to reconnect to transport service in %llu ms.\n",
937 h->reconnect_delay.rel_value);
940 = GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
941 if (h->reconnect_delay.rel_value == 0)
943 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
947 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
948 h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
955 * Closure for 'send_set_quota'.
957 struct SetQuotaContext
961 * Identity of the peer impacted by the quota change.
963 struct GNUNET_PeerIdentity target;
968 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
973 * Send SET_QUOTA message to the service.
975 * @param cls the 'struct SetQuotaContext'
976 * @param size number of bytes available in buf
977 * @param buf where to copy the message
978 * @return number of bytes copied to buf
981 send_set_quota (void *cls, size_t size, void *buf)
983 struct SetQuotaContext *sqc = cls;
984 struct QuotaSetMessage msg;
992 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
993 "Transmitting `%s' request with respect to `%4s'.\n",
994 "SET_QUOTA", GNUNET_i2s (&sqc->target));
996 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
997 msg.header.size = htons (sizeof (struct QuotaSetMessage));
998 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
999 msg.quota = sqc->quota_in;
1000 msg.peer = sqc->target;
1001 memcpy (buf, &msg, sizeof (msg));
1003 return sizeof (struct QuotaSetMessage);
1008 * Set the share of incoming bandwidth for the given
1009 * peer to the specified amount.
1011 * @param handle connection to transport service
1012 * @param target who's bandwidth quota is being changed
1013 * @param quota_in incoming bandwidth quota in bytes per ms
1014 * @param quota_out outgoing bandwidth quota in bytes per ms
1017 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
1018 const struct GNUNET_PeerIdentity *target,
1019 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
1020 struct GNUNET_BANDWIDTH_Value32NBO quota_out)
1022 struct Neighbour *n;
1023 struct SetQuotaContext *sqc;
1025 n = neighbour_find (handle, target);
1028 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1029 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
1030 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1033 GNUNET_assert (NULL != handle->client);
1035 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
1036 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1037 "Quota changed from %u to %u for peer `%s'\n",
1038 (unsigned int) n->out_tracker.available_bytes_per_s__,
1039 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1041 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1042 "Quota remains at %u for peer `%s'\n",
1043 (unsigned int) n->out_tracker.available_bytes_per_s__,
1044 GNUNET_i2s (target));
1046 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, quota_out);
1047 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
1048 sqc->target = *target;
1049 sqc->quota_in = quota_in;
1050 schedule_control_transmit (handle,
1051 sizeof (struct QuotaSetMessage),
1052 &send_set_quota, sqc);
1057 * Send REQUEST_CONNECT message to the service.
1059 * @param cls the 'struct GNUNET_PeerIdentity'
1060 * @param size number of bytes available in buf
1061 * @param buf where to copy the message
1062 * @return number of bytes copied to buf
1065 send_try_connect (void *cls, size_t size, void *buf)
1067 struct GNUNET_PeerIdentity *pid = cls;
1068 struct TransportRequestConnectMessage msg;
1076 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1077 "Transmitting `%s' request with respect to `%4s'.\n",
1078 "REQUEST_CONNECT", GNUNET_i2s (pid));
1080 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1081 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1082 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1083 msg.reserved = htonl (0);
1085 memcpy (buf, &msg, sizeof (msg));
1087 return sizeof (struct TransportRequestConnectMessage);
1092 * Ask the transport service to establish a connection to
1095 * @param handle connection to transport service
1096 * @param target who we should try to connect to
1099 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1100 const struct GNUNET_PeerIdentity *target)
1102 struct GNUNET_PeerIdentity *pid;
1104 if (NULL == handle->client)
1106 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1108 schedule_control_transmit (handle,
1109 sizeof (struct TransportRequestConnectMessage),
1110 &send_try_connect, pid);
1115 * Send HELLO message to the service.
1117 * @param cls the HELLO message to send
1118 * @param size number of bytes available in buf
1119 * @param buf where to copy the message
1120 * @return number of bytes copied to buf
1123 send_hello (void *cls, size_t size, void *buf)
1125 struct GNUNET_MessageHeader *msg = cls;
1130 #if DEBUG_TRANSPORT_TIMEOUT
1131 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1132 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1138 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1140 ssize = ntohs (msg->size);
1141 GNUNET_assert (size >= ssize);
1142 memcpy (buf, msg, ssize);
1149 * Offer the transport service the HELLO of another peer. Note that
1150 * the transport service may just ignore this message if the HELLO is
1151 * malformed or useless due to our local configuration.
1153 * @param handle connection to transport service
1154 * @param hello the hello message
1155 * @param cont continuation to call when HELLO has been sent
1156 * @param cls closure for continuation
1160 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1161 const struct GNUNET_MessageHeader *hello,
1162 GNUNET_SCHEDULER_Task cont, void *cls)
1165 struct GNUNET_PeerIdentity peer;
1166 struct GNUNET_MessageHeader *msg;
1168 if (NULL == handle->client)
1170 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1171 size = ntohs (hello->size);
1172 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1174 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1179 msg = GNUNET_malloc (size);
1180 memcpy (msg, hello, size);
1182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1183 "Offering `%s' message of `%4s' to transport for validation.\n",
1184 "HELLO", GNUNET_i2s (&peer));
1186 schedule_control_transmit (handle, size, &send_hello, msg);
1191 * Obtain the HELLO message for this peer.
1193 * @param handle connection to transport service
1194 * @param rec function to call with the HELLO, sender will be our peer
1195 * identity; message and sender will be NULL on timeout
1196 * (handshake with transport service pending/failed).
1197 * cost estimate will be 0.
1198 * @param rec_cls closure for rec
1201 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1202 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1205 struct HelloWaitList *hwl;
1207 hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
1209 hwl->rec_cls = rec_cls;
1210 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1211 if (handle->my_hello == NULL)
1213 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1218 * Stop receiving updates about changes to our HELLO message.
1220 * @param handle connection to transport service
1221 * @param rec function previously registered to be called with the HELLOs
1222 * @param rec_cls closure for rec
1225 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
1226 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1229 struct HelloWaitList *pos;
1231 pos = handle->hwl_head;
1234 if ((pos->rec == rec) && (pos->rec_cls == rec_cls))
1238 GNUNET_break (pos != NULL);
1241 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, pos);
1247 * Connect to the transport service. Note that the connection may
1248 * complete (or fail) asynchronously.
1250 * @param cfg configuration to use
1251 * @param self our own identity (API should check that it matches
1252 * the identity found by transport), or NULL (no check)
1253 * @param cls closure for the callbacks
1254 * @param rec receive function to call
1255 * @param nc function to call on connect events
1256 * @param nd function to call on disconnect events
1258 struct GNUNET_TRANSPORT_Handle *
1259 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1260 const struct GNUNET_PeerIdentity *self,
1262 GNUNET_TRANSPORT_ReceiveCallback rec,
1263 GNUNET_TRANSPORT_NotifyConnect nc,
1264 GNUNET_TRANSPORT_NotifyDisconnect nd)
1266 struct GNUNET_TRANSPORT_Handle *ret;
1268 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1272 ret->check_self = GNUNET_YES;
1279 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1281 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE);
1283 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1284 ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
1290 * Disconnect from the transport service.
1292 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1295 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1300 /* this disconnects all neighbours... */
1301 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1302 disconnect_and_schedule_reconnect (handle);
1303 /* and now we stop trying to connect again... */
1304 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1306 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1307 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1309 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1310 handle->neighbours = NULL;
1311 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1313 GNUNET_SCHEDULER_cancel (handle->quota_task);
1314 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1316 GNUNET_free_non_null (handle->my_hello);
1317 handle->my_hello = NULL;
1318 GNUNET_assert (handle->hwl_head == NULL);
1319 GNUNET_assert (handle->hwl_tail == NULL);
1320 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1321 handle->ready_heap = NULL;
1322 GNUNET_free (handle);
1327 * Check if we could queue a message of the given size for
1328 * transmission. The transport service will take both its
1329 * internal buffers and bandwidth limits imposed by the
1330 * other peer into consideration when answering this query.
1332 * @param handle connection to transport service
1333 * @param target who should receive the message
1334 * @param size how big is the message we want to transmit?
1335 * @param priority how important is the message?
1336 * @param timeout after how long should we give up (and call
1337 * notify with buf NULL and size 0)?
1338 * @param notify function to call when we are ready to
1339 * send such a message
1340 * @param notify_cls closure for notify
1341 * @return NULL if someone else is already waiting to be notified
1342 * non-NULL if the notify callback was queued (can be used to cancel
1343 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1345 struct GNUNET_TRANSPORT_TransmitHandle *
1346 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1347 const struct GNUNET_PeerIdentity
1348 *target, size_t size, uint32_t priority,
1349 struct GNUNET_TIME_Relative timeout,
1350 GNUNET_CONNECTION_TransmitReadyNotify
1351 notify, void *notify_cls)
1353 struct Neighbour *n;
1354 struct GNUNET_TRANSPORT_TransmitHandle *th;
1355 struct GNUNET_TIME_Relative delay;
1357 n = neighbour_find (handle, target);
1360 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1361 * once a connection has been established */
1367 /* attempt to send two messages at the same time to the same peer */
1371 GNUNET_assert (NULL == n->hn);
1372 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1374 th->notify = notify;
1375 th->notify_cls = notify_cls;
1376 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1377 th->notify_size = size;
1378 th->priority = priority;
1380 /* calculate when our transmission should be ready */
1381 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1382 if (delay.rel_value > timeout.rel_value)
1383 delay.rel_value = 0; /* notify immediately (with failure) */
1385 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1386 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1387 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1389 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1390 schedule_transmission (handle);
1396 * Cancel the specified transmission-ready notification.
1398 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1401 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1402 GNUNET_TRANSPORT_TransmitHandle
1405 struct Neighbour *n;
1407 GNUNET_assert (NULL == th->next);
1408 GNUNET_assert (NULL == th->prev);
1410 GNUNET_assert (th == n->th);
1414 GNUNET_CONTAINER_heap_remove_node (n->hn);
1419 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1420 GNUNET_SCHEDULER_cancel (th->timeout_task);
1421 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1427 /* end of transport_api.c */