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
7 by the Free Software Foundation; either version 3, or (at your
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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"
44 #define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)
47 * How large to start with for the hashmap of neighbours.
49 #define STARTING_NEIGHBOURS_SIZE 16
52 * Handle for a message that should be transmitted to the service.
53 * Used for both control messages and normal messages.
55 struct GNUNET_TRANSPORT_TransmitHandle
59 * We keep all requests in a DLL.
61 struct GNUNET_TRANSPORT_TransmitHandle *next;
64 * We keep all requests in a DLL.
66 struct GNUNET_TRANSPORT_TransmitHandle *prev;
69 * Neighbour for this handle, NULL for control messages.
71 struct Neighbour *neighbour;
74 * Function to call when notify_size bytes are available
77 GNUNET_CONNECTION_TransmitReadyNotify notify;
85 * Timeout for this request, 0 for control messages.
87 struct GNUNET_TIME_Absolute timeout;
90 * Task to trigger request timeout if the request is stalled due to
93 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
96 * How many bytes is our notify callback waiting for?
101 * How important is this message? Not used for control messages.
109 * Entry in hash table of all of our current neighbours.
114 * Overall transport handle.
116 struct GNUNET_TRANSPORT_Handle *h;
119 * Active transmit handle or NULL.
121 struct GNUNET_TRANSPORT_TransmitHandle *th;
124 * Identity of this neighbour.
126 struct GNUNET_PeerIdentity id;
129 * Outbound bandwidh tracker.
131 struct GNUNET_BANDWIDTH_Tracker out_tracker;
134 * Entry in our readyness heap (which is sorted by 'next_ready'
135 * value). NULL if there is no pending transmission request for
136 * this neighbour or if we're waiting for 'is_ready' to become
137 * true AFTER the 'out_tracker' suggested that this peer's quota
138 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
139 * we should immediately go back into the heap).
141 struct GNUNET_CONTAINER_HeapNode *hn;
144 * Is this peer currently ready to receive a message?
152 * Linked list of functions to call whenever our HELLO is updated.
154 struct GNUNET_TRANSPORT_GetHelloHandle
158 * This is a doubly linked list.
160 struct GNUNET_TRANSPORT_GetHelloHandle *next;
163 * This is a doubly linked list.
165 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
170 struct GNUNET_TRANSPORT_Handle *handle;
173 * Callback to call once we got our HELLO.
175 GNUNET_TRANSPORT_HelloUpdateCallback rec;
186 * Handle for the transport service (includes all of the
187 * state for the transport service).
189 struct GNUNET_TRANSPORT_Handle
193 * Closure for the callbacks.
198 * Function to call for received data.
200 GNUNET_TRANSPORT_ReceiveCallback rec;
203 * function to call on connect events
205 GNUNET_TRANSPORT_NotifyConnect nc_cb;
208 * function to call on disconnect events
210 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
213 * Head of DLL of control messages.
215 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
218 * Tail of DLL of control messages.
220 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
223 * The current HELLO message for this peer. Updated
224 * whenever transports change their addresses.
226 struct GNUNET_HELLO_Message *my_hello;
229 * My client connection to the transport service.
231 struct GNUNET_CLIENT_Connection *client;
234 * Handle to our registration with the client for notification.
236 struct GNUNET_CLIENT_TransmitHandle *cth;
239 * Linked list of pending requests for our HELLO.
241 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
244 * Linked list of pending requests for our HELLO.
246 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
251 const struct GNUNET_CONFIGURATION_Handle *cfg;
254 * Hash map of the current connected neighbours of this peer.
255 * Maps peer identities to 'struct Neighbour' entries.
257 struct GNUNET_CONTAINER_MultiHashMap *neighbours;
260 * Heap sorting peers with pending messages by the timestamps that
261 * specify when we could next send a message to the respective peer.
262 * Excludes control messages (which can always go out immediately).
263 * Maps time stamps to 'struct Neighbour' entries.
265 struct GNUNET_CONTAINER_Heap *ready_heap;
268 * Peer identity as assumed by this process, or all zeros.
270 struct GNUNET_PeerIdentity self;
273 * ID of the task trying to reconnect to the service.
275 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
278 * ID of the task trying to trigger transmission for a peer while
279 * maintaining bandwidth quotas. In use if there are no control
280 * messages and the smallest entry in the 'ready_heap' has a time
281 * stamp in the future.
283 GNUNET_SCHEDULER_TaskIdentifier quota_task;
286 * Delay until we try to reconnect.
288 struct GNUNET_TIME_Relative reconnect_delay;
291 * Should we check that 'self' matches what the service thinks?
292 * (if GNUNET_NO, then 'self' is all zeros!).
299 * Schedule the task to send one message, either from the control
300 * list or the peer message queues to the service.
302 * @param h transport service to schedule a transmission for
305 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
309 * Function that will schedule the job that will try
310 * to connect us again to the client.
312 * @param h transport service to reconnect
315 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
319 * Get the neighbour list entry for the given peer
321 * @param h our context
322 * @param peer peer to look up
323 * @return NULL if no such peer entry exists
325 static struct Neighbour *
326 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
327 const struct GNUNET_PeerIdentity *peer)
329 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
334 * Add neighbour to our list
336 * @return NULL if this API is currently disconnecting from the service
338 static struct Neighbour *
339 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
340 const struct GNUNET_PeerIdentity *pid)
344 #if DEBUG_TRANSPORT_API
345 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating entry for neighbour `%4s'.\n",
348 n = GNUNET_malloc (sizeof (struct Neighbour));
351 n->is_ready = GNUNET_YES;
352 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
353 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
354 MAX_BANDWIDTH_CARRY_S);
355 GNUNET_assert (GNUNET_OK ==
356 GNUNET_CONTAINER_multihashmap_put (h->neighbours,
358 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
364 * Iterator over hash map entries, for deleting state of a neighbour.
366 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
367 * @param key peer identity
368 * @param value value in the hash map, the neighbour entry to delete
369 * @return GNUNET_YES if we should continue to
374 neighbour_delete (void *cls, const GNUNET_HashCode * key, void *value)
376 struct GNUNET_TRANSPORT_Handle *handle = cls;
377 struct Neighbour *n = value;
379 if (NULL != handle->nd_cb)
380 handle->nd_cb (handle->cls, &n->id);
381 GNUNET_assert (NULL == n->th);
382 GNUNET_assert (NULL == n->hn);
383 GNUNET_assert (GNUNET_YES ==
384 GNUNET_CONTAINER_multihashmap_remove (handle->neighbours, key,
392 * Function we use for handling incoming messages.
394 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
395 * @param msg message received, NULL on timeout or fatal error
398 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
400 struct GNUNET_TRANSPORT_Handle *h = cls;
401 const struct DisconnectInfoMessage *dim;
402 const struct ConnectInfoMessage *cim;
403 const struct InboundMessage *im;
404 const struct GNUNET_MessageHeader *imm;
405 const struct SendOkMessage *okm;
406 const struct QuotaSetMessage *qm;
407 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
408 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
410 struct GNUNET_PeerIdentity me;
414 GNUNET_assert (h->client != NULL);
417 #if DEBUG_TRANSPORT_API
418 LOG (GNUNET_ERROR_TYPE_INFO,
419 "Error receiving from transport service, disconnecting temporarily.\n");
421 disconnect_and_schedule_reconnect (h);
424 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
425 GNUNET_TIME_UNIT_FOREVER_REL);
426 size = ntohs (msg->size);
427 switch (ntohs (msg->type))
429 case GNUNET_MESSAGE_TYPE_HELLO:
431 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
436 #if DEBUG_TRANSPORT_API
437 LOG (GNUNET_ERROR_TYPE_DEBUG,
438 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
441 GNUNET_free_non_null (h->my_hello);
443 if (size < sizeof (struct GNUNET_MessageHeader))
448 h->my_hello = GNUNET_malloc (size);
449 memcpy (h->my_hello, msg, size);
453 next_hwl = hwl->next;
454 hwl->rec (hwl->rec_cls,
455 (const struct GNUNET_MessageHeader *) h->my_hello);
459 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
460 if (size < sizeof (struct ConnectInfoMessage))
465 cim = (const struct ConnectInfoMessage *) msg;
466 ats_count = ntohl (cim->ats_count);
468 sizeof (struct ConnectInfoMessage) +
469 ats_count * sizeof (struct GNUNET_ATS_Information))
474 #if DEBUG_TRANSPORT_API
475 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
476 "CONNECT", GNUNET_i2s (&cim->id));
478 n = neighbour_find (h, &cim->id);
484 n = neighbour_add (h, &cim->id);
485 if (h->nc_cb != NULL)
486 h->nc_cb (h->cls, &n->id, &cim->ats, ats_count);
488 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
489 if (size != sizeof (struct DisconnectInfoMessage))
494 dim = (const struct DisconnectInfoMessage *) msg;
495 GNUNET_break (ntohl (dim->reserved) == 0);
496 #if DEBUG_TRANSPORT_API_DISCONNECT
497 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
498 "DISCONNECT", GNUNET_i2s (&dim->peer));
500 n = neighbour_find (h, &dim->peer);
506 neighbour_delete (h, &dim->peer.hashPubKey, n);
508 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
509 if (size != sizeof (struct SendOkMessage))
514 okm = (const struct SendOkMessage *) msg;
515 #if DEBUG_TRANSPORT_API
516 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message, transmission %s.\n",
517 "SEND_OK", ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
519 n = neighbour_find (h, &okm->peer);
522 GNUNET_break (GNUNET_NO == n->is_ready);
523 n->is_ready = GNUNET_YES;
524 if ((n->th != NULL) && (n->hn == NULL))
526 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
527 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
528 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
529 /* we've been waiting for this (congestion, not quota,
530 * caused delayed transmission) */
531 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
532 schedule_transmission (h);
535 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
536 #if DEBUG_TRANSPORT_API
537 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
540 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
545 im = (const struct InboundMessage *) msg;
546 ats_count = ntohl (im->ats_count);
547 imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count + 1]);
549 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
550 ats_count * sizeof (struct GNUNET_ATS_Information) != size)
555 #if DEBUG_TRANSPORT_API
556 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message of type %u from `%4s'.\n",
557 ntohs (imm->type), GNUNET_i2s (&im->peer));
559 n = neighbour_find (h, &im->peer);
566 h->rec (h->cls, &im->peer, imm, &im->ats, ats_count);
568 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
569 #if DEBUG_TRANSPORT_API
570 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "SET_QUOTA");
572 if (size != sizeof (struct QuotaSetMessage))
577 qm = (const struct QuotaSetMessage *) msg;
578 n = neighbour_find (h, &qm->peer);
584 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
587 LOG (GNUNET_ERROR_TYPE_ERROR,
588 _("Received unexpected message of type %u in %s:%u\n"),
589 ntohs (msg->type), __FILE__, __LINE__);
597 * A transmission request could not be satisfied because of
598 * network congestion. Notify the initiator and clean up.
600 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
601 * @param tc scheduler context
604 timeout_request_due_to_congestion (void *cls,
605 const struct GNUNET_SCHEDULER_TaskContext
608 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
609 struct Neighbour *n = th->neighbour;
611 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
612 GNUNET_assert (th == n->th);
613 GNUNET_assert (NULL == n->hn);
615 th->notify (th->notify_cls, 0, NULL);
621 * Transmit message(s) to service.
623 * @param cls handle to transport
624 * @param size number of bytes available in buf
625 * @param buf where to copy the message
626 * @return number of bytes copied to buf
629 transport_notify_ready (void *cls, size_t size, void *buf)
631 struct GNUNET_TRANSPORT_Handle *h = cls;
632 struct GNUNET_TRANSPORT_TransmitHandle *th;
635 struct OutboundMessage obm;
640 GNUNET_assert (NULL != h->client);
644 /* transmission failed */
645 disconnect_and_schedule_reconnect (h);
651 /* first send control messages */
652 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
654 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
655 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
656 #if DEBUG_TRANSPORT_API
657 LOG (GNUNET_ERROR_TYPE_DEBUG, "Added %u bytes of control message at %u\n",
665 /* then, if possible and no control messages pending, send data messages */
666 while ((NULL == h->control_head) &&
667 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
669 if (GNUNET_YES != n->is_ready)
671 /* peer not ready, wait for notification! */
672 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
674 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
675 n->th->timeout_task =
676 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
678 &timeout_request_due_to_congestion,
683 if (th->notify_size + sizeof (struct OutboundMessage) > size)
684 break; /* does not fit */
685 if (GNUNET_BANDWIDTH_tracker_get_delay
686 (&n->out_tracker, th->notify_size).rel_value > 0)
687 break; /* too early */
688 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
691 n->is_ready = GNUNET_NO;
692 GNUNET_assert (size >= sizeof (struct OutboundMessage));
694 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
695 &cbuf[ret + sizeof (struct OutboundMessage)]);
696 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
699 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
700 GNUNET_SERVER_MAX_MESSAGE_SIZE);
701 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
702 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
703 obm.priority = htonl (th->priority);
705 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
708 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
709 ret += (mret + sizeof (struct OutboundMessage));
710 size -= (mret + sizeof (struct OutboundMessage));
711 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
715 /* if there are more pending messages, try to schedule those */
716 schedule_transmission (h);
717 #if DEBUG_TRANSPORT_API
718 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to transport service\n",
726 * Schedule the task to send one message, either from the control
727 * list or the peer message queues to the service.
729 * @param cls transport service to schedule a transmission for
730 * @param tc scheduler context
733 schedule_transmission_task (void *cls,
734 const struct GNUNET_SCHEDULER_TaskContext *tc)
736 struct GNUNET_TRANSPORT_Handle *h = cls;
738 struct GNUNET_TRANSPORT_TransmitHandle *th;
741 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
742 GNUNET_assert (NULL != h->client);
743 /* destroy all requests that have timed out */
744 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
745 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
747 /* notify client that the request could not be satisfied within
748 * the given time constraints */
751 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
753 #if DEBUG_TRANSPORT_API
754 LOG (GNUNET_ERROR_TYPE_DEBUG,
755 "Signalling timeout for transmission to peer %s due to congestion\n",
756 GNUNET_i2s (&n->id));
758 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
763 if (NULL != h->control_head)
765 size = h->control_head->notify_size;
769 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
771 return; /* no pending messages */
772 size = n->th->notify_size + sizeof (struct OutboundMessage);
774 #if DEBUG_TRANSPORT_API
775 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
778 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
779 GNUNET_TIME_UNIT_FOREVER_REL,
780 GNUNET_NO, &transport_notify_ready,
782 GNUNET_assert (NULL != h->cth);
787 * Schedule the task to send one message, either from the control
788 * list or the peer message queues to the service.
790 * @param h transport service to schedule a transmission for
793 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
795 struct GNUNET_TIME_Relative delay;
798 GNUNET_assert (NULL != h->client);
799 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
801 GNUNET_SCHEDULER_cancel (h->quota_task);
802 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
804 if (NULL != h->control_head)
805 delay = GNUNET_TIME_UNIT_ZERO;
806 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
808 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
811 return; /* no work to be done */
812 #if DEBUG_TRANSPORT_API
813 LOG (GNUNET_ERROR_TYPE_DEBUG,
814 "Scheduling next transmission to service in %llu ms\n",
815 (unsigned long long) delay.rel_value);
818 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
823 * Queue control request for transmission to the transport
826 * @param h handle to the transport service
827 * @param size number of bytes to be transmitted
828 * @param notify function to call to get the content
829 * @param notify_cls closure for notify
832 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
833 GNUNET_CONNECTION_TransmitReadyNotify notify,
836 struct GNUNET_TRANSPORT_TransmitHandle *th;
838 #if DEBUG_TRANSPORT_API
839 LOG (GNUNET_ERROR_TYPE_DEBUG, "Control transmit of %u bytes requested\n",
842 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
844 th->notify_cls = notify_cls;
845 th->notify_size = size;
846 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
847 schedule_transmission (h);
852 * Transmit START message to service.
855 * @param size number of bytes available in buf
856 * @param buf where to copy the message
857 * @return number of bytes copied to buf
860 send_start (void *cls, size_t size, void *buf)
862 struct GNUNET_TRANSPORT_Handle *h = cls;
863 struct StartMessage s;
867 /* Can only be shutdown, just give up */
868 #if DEBUG_TRANSPORT_API
869 LOG (GNUNET_ERROR_TYPE_DEBUG,
870 "Shutdown while trying to transmit `%s' request.\n", "START");
874 #if DEBUG_TRANSPORT_API
875 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
877 GNUNET_assert (size >= sizeof (struct StartMessage));
878 s.header.size = htons (sizeof (struct StartMessage));
879 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
880 s.do_check = htonl (h->check_self);
882 memcpy (buf, &s, sizeof (struct StartMessage));
883 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
884 GNUNET_TIME_UNIT_FOREVER_REL);
885 return sizeof (struct StartMessage);
890 * Try again to connect to transport service.
892 * @param cls the handle to the transport service
893 * @param tc scheduler context
896 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
898 struct GNUNET_TRANSPORT_Handle *h = cls;
900 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
901 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
903 /* shutdown, just give up */
906 #if DEBUG_TRANSPORT_API
907 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
909 GNUNET_assert (h->client == NULL);
910 GNUNET_assert (h->control_head == NULL);
911 GNUNET_assert (h->control_tail == NULL);
912 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
913 GNUNET_assert (h->client != NULL);
914 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
919 * Function that will schedule the job that will try
920 * to connect us again to the client.
922 * @param h transport service to reconnect
925 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
927 struct GNUNET_TRANSPORT_TransmitHandle *th;
929 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
930 /* Forget about all neighbours that we used to be connected to */
931 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
934 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
937 if (NULL != h->client)
939 GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
942 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
944 GNUNET_SCHEDULER_cancel (h->quota_task);
945 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
947 while ((NULL != (th = h->control_head)))
949 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
950 th->notify (th->notify_cls, 0, NULL);
953 #if DEBUG_TRANSPORT_API
954 LOG (GNUNET_ERROR_TYPE_DEBUG,
955 "Scheduling task to reconnect to transport service in %llu ms.\n",
956 h->reconnect_delay.rel_value);
959 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
960 if (h->reconnect_delay.rel_value == 0)
962 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
966 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
968 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->reconnect_delay);
974 * Closure for 'send_set_quota'.
976 struct SetQuotaContext
980 * Identity of the peer impacted by the quota change.
982 struct GNUNET_PeerIdentity target;
987 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
992 * Send SET_QUOTA message to the service.
994 * @param cls the 'struct SetQuotaContext'
995 * @param size number of bytes available in buf
996 * @param buf where to copy the message
997 * @return number of bytes copied to buf
1000 send_set_quota (void *cls, size_t size, void *buf)
1002 struct SetQuotaContext *sqc = cls;
1003 struct QuotaSetMessage msg;
1010 #if DEBUG_TRANSPORT_API
1011 LOG (GNUNET_ERROR_TYPE_DEBUG,
1012 "Transmitting `%s' request with respect to `%4s'.\n", "SET_QUOTA",
1013 GNUNET_i2s (&sqc->target));
1015 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
1016 msg.header.size = htons (sizeof (struct QuotaSetMessage));
1017 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1018 msg.quota = sqc->quota_in;
1019 msg.peer = sqc->target;
1020 memcpy (buf, &msg, sizeof (msg));
1022 return sizeof (struct QuotaSetMessage);
1027 * Set the share of incoming bandwidth for the given
1028 * peer to the specified amount.
1030 * @param handle connection to transport service
1031 * @param target who's bandwidth quota is being changed
1032 * @param quota_in incoming bandwidth quota in bytes per ms
1033 * @param quota_out outgoing bandwidth quota in bytes per ms
1036 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
1037 const struct GNUNET_PeerIdentity *target,
1038 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
1039 struct GNUNET_BANDWIDTH_Value32NBO quota_out)
1041 struct Neighbour *n;
1042 struct SetQuotaContext *sqc;
1044 n = neighbour_find (handle, target);
1047 LOG (GNUNET_ERROR_TYPE_ERROR,
1048 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
1049 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1052 GNUNET_assert (NULL != handle->client);
1053 #if DEBUG_TRANSPORT_API
1054 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
1055 LOG (GNUNET_ERROR_TYPE_DEBUG, "Quota changed from %u to %u for peer `%s'\n",
1056 (unsigned int) n->out_tracker.available_bytes_per_s__,
1057 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1059 LOG (GNUNET_ERROR_TYPE_DEBUG, "Quota remains at %u for peer `%s'\n",
1060 (unsigned int) n->out_tracker.available_bytes_per_s__,
1061 GNUNET_i2s (target));
1063 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, quota_out);
1064 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
1065 sqc->target = *target;
1066 sqc->quota_in = quota_in;
1067 schedule_control_transmit (handle, sizeof (struct QuotaSetMessage),
1068 &send_set_quota, sqc);
1073 * Send REQUEST_CONNECT message to the service.
1075 * @param cls the 'struct GNUNET_PeerIdentity'
1076 * @param size number of bytes available in buf
1077 * @param buf where to copy the message
1078 * @return number of bytes copied to buf
1081 send_try_connect (void *cls, size_t size, void *buf)
1083 struct GNUNET_PeerIdentity *pid = cls;
1084 struct TransportRequestConnectMessage msg;
1091 #if DEBUG_TRANSPORT_API
1092 LOG (GNUNET_ERROR_TYPE_DEBUG,
1093 "Transmitting `%s' request with respect to `%4s'.\n", "REQUEST_CONNECT",
1096 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1097 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1098 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1099 msg.reserved = htonl (0);
1101 memcpy (buf, &msg, sizeof (msg));
1103 return sizeof (struct TransportRequestConnectMessage);
1108 * Ask the transport service to establish a connection to
1111 * @param handle connection to transport service
1112 * @param target who we should try to connect to
1115 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1116 const struct GNUNET_PeerIdentity *target)
1118 struct GNUNET_PeerIdentity *pid;
1120 if (NULL == handle->client)
1122 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1124 schedule_control_transmit (handle,
1125 sizeof (struct TransportRequestConnectMessage),
1126 &send_try_connect, pid);
1131 * Send HELLO message to the service.
1133 * @param cls the HELLO message to send
1134 * @param size number of bytes available in buf
1135 * @param buf where to copy the message
1136 * @return number of bytes copied to buf
1139 send_hello (void *cls, size_t size, void *buf)
1141 struct GNUNET_MessageHeader *msg = cls;
1146 #if DEBUG_TRANSPORT_TIMEOUT
1147 LOG (GNUNET_ERROR_TYPE_DEBUG,
1148 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1153 #if DEBUG_TRANSPORT_API
1154 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1156 ssize = ntohs (msg->size);
1157 GNUNET_assert (size >= ssize);
1158 memcpy (buf, msg, ssize);
1165 * Offer the transport service the HELLO of another peer. Note that
1166 * the transport service may just ignore this message if the HELLO is
1167 * malformed or useless due to our local configuration.
1169 * @param handle connection to transport service
1170 * @param hello the hello message
1171 * @param cont continuation to call when HELLO has been sent
1172 * @param cls closure for continuation
1176 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1177 const struct GNUNET_MessageHeader *hello,
1178 GNUNET_SCHEDULER_Task cont, void *cls)
1181 struct GNUNET_PeerIdentity peer;
1182 struct GNUNET_MessageHeader *msg;
1184 if (NULL == handle->client)
1186 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1187 size = ntohs (hello->size);
1188 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1190 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1195 msg = GNUNET_malloc (size);
1196 memcpy (msg, hello, size);
1197 #if DEBUG_TRANSPORT_API
1198 LOG (GNUNET_ERROR_TYPE_DEBUG,
1199 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1200 GNUNET_i2s (&peer));
1202 schedule_control_transmit (handle, size, &send_hello, msg);
1207 * Obtain the HELLO message for this peer.
1209 * @param handle connection to transport service
1210 * @param rec function to call with the HELLO, sender will be our peer
1211 * identity; message and sender will be NULL on timeout
1212 * (handshake with transport service pending/failed).
1213 * cost estimate will be 0.
1214 * @param rec_cls closure for rec
1215 * @return handle to cancel the operation
1217 struct GNUNET_TRANSPORT_GetHelloHandle *
1218 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1219 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1222 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1224 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1226 hwl->rec_cls = rec_cls;
1227 hwl->handle = handle;
1228 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1229 if (handle->my_hello != NULL)
1230 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1236 * Stop receiving updates about changes to our HELLO message.
1238 * @param ghh handle to cancel
1241 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1243 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1245 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1251 * Connect to the transport service. Note that the connection may
1252 * complete (or fail) asynchronously.
1254 * @param cfg configuration to use
1255 * @param self our own identity (API should check that it matches
1256 * the identity found by transport), or NULL (no check)
1257 * @param cls closure for the callbacks
1258 * @param rec receive function to call
1259 * @param nc function to call on connect events
1260 * @param nd function to call on disconnect events
1262 struct GNUNET_TRANSPORT_Handle *
1263 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1264 const struct GNUNET_PeerIdentity *self, void *cls,
1265 GNUNET_TRANSPORT_ReceiveCallback rec,
1266 GNUNET_TRANSPORT_NotifyConnect nc,
1267 GNUNET_TRANSPORT_NotifyDisconnect nd)
1269 struct GNUNET_TRANSPORT_Handle *ret;
1271 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1275 ret->check_self = GNUNET_YES;
1282 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1284 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE);
1286 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1287 ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
1293 * Disconnect from the transport service.
1295 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1298 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1300 #if DEBUG_TRANSPORT_API
1301 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1303 /* this disconnects all neighbours... */
1304 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1305 disconnect_and_schedule_reconnect (handle);
1306 /* and now we stop trying to connect again... */
1307 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1309 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1310 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1312 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1313 handle->neighbours = NULL;
1314 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1316 GNUNET_SCHEDULER_cancel (handle->quota_task);
1317 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1319 GNUNET_free_non_null (handle->my_hello);
1320 handle->my_hello = NULL;
1321 GNUNET_assert (handle->hwl_head == NULL);
1322 GNUNET_assert (handle->hwl_tail == NULL);
1323 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1324 handle->ready_heap = NULL;
1325 GNUNET_free (handle);
1330 * Check if we could queue a message of the given size for
1331 * transmission. The transport service will take both its
1332 * internal buffers and bandwidth limits imposed by the
1333 * other peer into consideration when answering this query.
1335 * @param handle connection to transport service
1336 * @param target who should receive the message
1337 * @param size how big is the message we want to transmit?
1338 * @param priority how important is the message?
1339 * @param timeout after how long should we give up (and call
1340 * notify with buf NULL and size 0)?
1341 * @param notify function to call when we are ready to
1342 * send such a message
1343 * @param notify_cls closure for notify
1344 * @return NULL if someone else is already waiting to be notified
1345 * non-NULL if the notify callback was queued (can be used to cancel
1346 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1348 struct GNUNET_TRANSPORT_TransmitHandle *
1349 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1350 const struct GNUNET_PeerIdentity
1351 *target, size_t size, uint32_t priority,
1352 struct GNUNET_TIME_Relative timeout,
1353 GNUNET_CONNECTION_TransmitReadyNotify
1354 notify, void *notify_cls)
1356 struct Neighbour *n;
1357 struct GNUNET_TRANSPORT_TransmitHandle *th;
1358 struct GNUNET_TIME_Relative delay;
1360 n = neighbour_find (handle, target);
1363 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1364 * once a connection has been established */
1370 /* attempt to send two messages at the same time to the same peer */
1374 GNUNET_assert (NULL == n->hn);
1375 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1377 th->notify = notify;
1378 th->notify_cls = notify_cls;
1379 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1380 th->notify_size = size;
1381 th->priority = priority;
1383 /* calculate when our transmission should be ready */
1384 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1385 if (delay.rel_value > timeout.rel_value)
1386 delay.rel_value = 0; /* notify immediately (with failure) */
1387 #if DEBUG_TRANSPORT_API
1388 LOG (GNUNET_ERROR_TYPE_DEBUG,
1389 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1390 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1392 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1393 schedule_transmission (handle);
1399 * Cancel the specified transmission-ready notification.
1401 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1404 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1405 GNUNET_TRANSPORT_TransmitHandle
1408 struct Neighbour *n;
1410 GNUNET_assert (NULL == th->next);
1411 GNUNET_assert (NULL == th->prev);
1413 GNUNET_assert (th == n->th);
1417 GNUNET_CONTAINER_heap_remove_node (n->hn);
1422 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1423 GNUNET_SCHEDULER_cancel (th->timeout_task);
1424 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1430 /* end of transport_api.c */