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
50 * Handle for a message that should be transmitted to the service.
51 * Used for both control messages and normal messages.
53 struct GNUNET_TRANSPORT_TransmitHandle
57 * We keep all requests in a DLL.
59 struct GNUNET_TRANSPORT_TransmitHandle *next;
62 * We keep all requests in a DLL.
64 struct GNUNET_TRANSPORT_TransmitHandle *prev;
67 * Neighbour for this handle, NULL for control messages.
69 struct Neighbour *neighbour;
72 * Function to call when notify_size bytes are available
75 GNUNET_CONNECTION_TransmitReadyNotify notify;
83 * Timeout for this request, 0 for control messages.
85 struct GNUNET_TIME_Absolute timeout;
88 * Task to trigger request timeout if the request is stalled due to
91 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
94 * How many bytes is our notify callback waiting for?
99 * How important is this message? Not used for control messages.
107 * Entry in hash table of all of our current neighbours.
112 * Overall transport handle.
114 struct GNUNET_TRANSPORT_Handle *h;
117 * Active transmit handle or NULL.
119 struct GNUNET_TRANSPORT_TransmitHandle *th;
122 * Identity of this neighbour.
124 struct GNUNET_PeerIdentity id;
127 * Outbound bandwidh tracker.
129 struct GNUNET_BANDWIDTH_Tracker out_tracker;
132 * Entry in our readyness heap (which is sorted by 'next_ready'
133 * value). NULL if there is no pending transmission request for
134 * this neighbour or if we're waiting for 'is_ready' to become
135 * true AFTER the 'out_tracker' suggested that this peer's quota
136 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
137 * we should immediately go back into the heap).
139 struct GNUNET_CONTAINER_HeapNode *hn;
142 * Is this peer currently ready to receive a message?
150 * Linked list of functions to call whenever our HELLO is updated.
152 struct GNUNET_TRANSPORT_GetHelloHandle
156 * This is a doubly linked list.
158 struct GNUNET_TRANSPORT_GetHelloHandle *next;
161 * This is a doubly linked list.
163 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
168 struct GNUNET_TRANSPORT_Handle *handle;
171 * Callback to call once we got our HELLO.
173 GNUNET_TRANSPORT_HelloUpdateCallback rec;
184 * Handle for the transport service (includes all of the
185 * state for the transport service).
187 struct GNUNET_TRANSPORT_Handle
191 * Closure for the callbacks.
196 * Function to call for received data.
198 GNUNET_TRANSPORT_ReceiveCallback rec;
201 * function to call on connect events
203 GNUNET_TRANSPORT_NotifyConnect nc_cb;
206 * function to call on disconnect events
208 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
211 * Head of DLL of control messages.
213 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
216 * Tail of DLL of control messages.
218 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
221 * The current HELLO message for this peer. Updated
222 * whenever transports change their addresses.
224 struct GNUNET_HELLO_Message *my_hello;
227 * My client connection to the transport service.
229 struct GNUNET_CLIENT_Connection *client;
232 * Handle to our registration with the client for notification.
234 struct GNUNET_CLIENT_TransmitHandle *cth;
237 * Linked list of pending requests for our HELLO.
239 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
242 * Linked list of pending requests for our HELLO.
244 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
249 const struct GNUNET_CONFIGURATION_Handle *cfg;
252 * Hash map of the current connected neighbours of this peer.
253 * Maps peer identities to 'struct Neighbour' entries.
255 struct GNUNET_CONTAINER_MultiHashMap *neighbours;
258 * Heap sorting peers with pending messages by the timestamps that
259 * specify when we could next send a message to the respective peer.
260 * Excludes control messages (which can always go out immediately).
261 * Maps time stamps to 'struct Neighbour' entries.
263 struct GNUNET_CONTAINER_Heap *ready_heap;
266 * Peer identity as assumed by this process, or all zeros.
268 struct GNUNET_PeerIdentity self;
271 * ID of the task trying to reconnect to the service.
273 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
276 * ID of the task trying to trigger transmission for a peer while
277 * maintaining bandwidth quotas. In use if there are no control
278 * messages and the smallest entry in the 'ready_heap' has a time
279 * stamp in the future.
281 GNUNET_SCHEDULER_TaskIdentifier quota_task;
284 * Delay until we try to reconnect.
286 struct GNUNET_TIME_Relative reconnect_delay;
289 * Should we check that 'self' matches what the service thinks?
290 * (if GNUNET_NO, then 'self' is all zeros!).
297 * Schedule the task to send one message, either from the control
298 * list or the peer message queues to the service.
300 * @param h transport service to schedule a transmission for
303 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
307 * Function that will schedule the job that will try
308 * to connect us again to the client.
310 * @param h transport service to reconnect
313 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
317 * Get the neighbour list entry for the given peer
319 * @param h our context
320 * @param peer peer to look up
321 * @return NULL if no such peer entry exists
323 static struct Neighbour *
324 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
325 const struct GNUNET_PeerIdentity *peer)
327 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
332 * Add neighbour to our list
334 * @return NULL if this API is currently disconnecting from the service
336 static struct Neighbour *
337 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
338 const struct GNUNET_PeerIdentity *pid)
342 #if DEBUG_TRANSPORT_API
343 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating entry for neighbour `%4s'.\n",
346 n = GNUNET_malloc (sizeof (struct Neighbour));
349 n->is_ready = GNUNET_YES;
350 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
351 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
352 MAX_BANDWIDTH_CARRY_S);
353 GNUNET_assert (GNUNET_OK ==
354 GNUNET_CONTAINER_multihashmap_put (h->neighbours,
356 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
362 * Iterator over hash map entries, for deleting state of a neighbour.
364 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
365 * @param key peer identity
366 * @param value value in the hash map, the neighbour entry to delete
367 * @return GNUNET_YES if we should continue to
372 neighbour_delete (void *cls, const GNUNET_HashCode * key, void *value)
374 struct GNUNET_TRANSPORT_Handle *handle = cls;
375 struct Neighbour *n = value;
377 if (NULL != handle->nd_cb)
378 handle->nd_cb (handle->cls, &n->id);
379 GNUNET_assert (NULL == n->th);
380 GNUNET_assert (NULL == n->hn);
381 GNUNET_assert (GNUNET_YES ==
382 GNUNET_CONTAINER_multihashmap_remove (handle->neighbours, key,
390 * Function we use for handling incoming messages.
392 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
393 * @param msg message received, NULL on timeout or fatal error
396 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
398 struct GNUNET_TRANSPORT_Handle *h = cls;
399 const struct DisconnectInfoMessage *dim;
400 const struct ConnectInfoMessage *cim;
401 const struct InboundMessage *im;
402 const struct GNUNET_MessageHeader *imm;
403 const struct SendOkMessage *okm;
404 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
405 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
407 struct GNUNET_PeerIdentity me;
411 GNUNET_assert (h->client != NULL);
414 #if DEBUG_TRANSPORT_API
415 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
416 "Error receiving from transport service, disconnecting temporarily.\n");
418 disconnect_and_schedule_reconnect (h);
421 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
422 GNUNET_TIME_UNIT_FOREVER_REL);
423 size = ntohs (msg->size);
424 switch (ntohs (msg->type))
426 case GNUNET_MESSAGE_TYPE_HELLO:
428 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
433 #if DEBUG_TRANSPORT_API
434 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
435 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
438 GNUNET_free_non_null (h->my_hello);
440 if (size < sizeof (struct GNUNET_MessageHeader))
445 h->my_hello = GNUNET_malloc (size);
446 memcpy (h->my_hello, msg, size);
450 next_hwl = hwl->next;
451 hwl->rec (hwl->rec_cls,
452 (const struct GNUNET_MessageHeader *) h->my_hello);
456 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
457 if (size < sizeof (struct ConnectInfoMessage))
462 cim = (const struct ConnectInfoMessage *) msg;
463 ats_count = ntohl (cim->ats_count);
465 sizeof (struct ConnectInfoMessage) +
466 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information))
471 #if DEBUG_TRANSPORT_API
472 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
473 "CONNECT", GNUNET_i2s (&cim->id));
475 n = neighbour_find (h, &cim->id);
481 n = neighbour_add (h, &cim->id);
482 if (h->nc_cb != NULL)
483 h->nc_cb (h->cls, &n->id, &cim->ats, ats_count);
485 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
486 if (size != sizeof (struct DisconnectInfoMessage))
491 dim = (const struct DisconnectInfoMessage *) msg;
492 GNUNET_break (ntohl (dim->reserved) == 0);
493 #if DEBUG_TRANSPORT_API_DISCONNECT
494 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
495 "DISCONNECT", GNUNET_i2s (&dim->peer));
497 n = neighbour_find (h, &dim->peer);
503 neighbour_delete (h, &dim->peer.hashPubKey, n);
505 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
506 if (size != sizeof (struct SendOkMessage))
511 okm = (const struct SendOkMessage *) msg;
512 #if DEBUG_TRANSPORT_API
513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
514 "Receiving `%s' message, transmission %s.\n", "SEND_OK",
515 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
517 n = neighbour_find (h, &okm->peer);
520 GNUNET_break (GNUNET_NO == n->is_ready);
521 n->is_ready = GNUNET_YES;
522 if ((n->th != NULL) && (n->hn == NULL))
524 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
525 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
526 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
527 /* we've been waiting for this (congestion, not quota,
528 * caused delayed transmission) */
529 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
530 schedule_transmission (h);
533 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
534 #if DEBUG_TRANSPORT_API
535 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
538 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
543 im = (const struct InboundMessage *) msg;
544 GNUNET_break (0 == ntohl (im->reserved));
545 ats_count = ntohl (im->ats_count);
546 imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count + 1]);
548 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
549 ats_count * sizeof (struct GNUNET_TRANSPORT_ATS_Information) != size)
554 #if DEBUG_TRANSPORT_API
555 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
556 "Received message of type %u from `%4s'.\n", ntohs (imm->type),
557 GNUNET_i2s (&im->peer));
559 n = neighbour_find (h, &im->peer);
566 h->rec (h->cls, &im->peer, imm, &im->ats, ats_count);
569 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
570 _("Received unexpected message of type %u in %s:%u\n"),
571 ntohs (msg->type), __FILE__, __LINE__);
579 * A transmission request could not be satisfied because of
580 * network congestion. Notify the initiator and clean up.
582 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
583 * @param tc scheduler context
586 timeout_request_due_to_congestion (void *cls,
587 const struct GNUNET_SCHEDULER_TaskContext
590 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
591 struct Neighbour *n = th->neighbour;
593 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
594 GNUNET_assert (th == n->th);
595 GNUNET_assert (NULL == n->hn);
597 th->notify (th->notify_cls, 0, NULL);
603 * Transmit message(s) to service.
605 * @param cls handle to transport
606 * @param size number of bytes available in buf
607 * @param buf where to copy the message
608 * @return number of bytes copied to buf
611 transport_notify_ready (void *cls, size_t size, void *buf)
613 struct GNUNET_TRANSPORT_Handle *h = cls;
614 struct GNUNET_TRANSPORT_TransmitHandle *th;
617 struct OutboundMessage obm;
622 GNUNET_assert (NULL != h->client);
626 /* transmission failed */
627 disconnect_and_schedule_reconnect (h);
633 /* first send control messages */
634 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
636 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
637 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
638 #if DEBUG_TRANSPORT_API
639 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
640 "Added %u bytes of control message at %u\n", nret, ret);
647 /* then, if possible and no control messages pending, send data messages */
648 while ((NULL == h->control_head) &&
649 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
651 if (GNUNET_YES != n->is_ready)
653 /* peer not ready, wait for notification! */
654 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
656 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
657 n->th->timeout_task =
658 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
660 &timeout_request_due_to_congestion,
665 if (th->notify_size + sizeof (struct OutboundMessage) > size)
666 break; /* does not fit */
667 if (GNUNET_BANDWIDTH_tracker_get_delay
668 (&n->out_tracker, th->notify_size).rel_value > 0)
669 break; /* too early */
670 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
673 n->is_ready = GNUNET_NO;
674 GNUNET_assert (size >= sizeof (struct OutboundMessage));
676 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
677 &cbuf[ret + sizeof (struct OutboundMessage)]);
678 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
681 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
682 GNUNET_SERVER_MAX_MESSAGE_SIZE);
683 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
684 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
685 obm.priority = htonl (th->priority);
687 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
690 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
691 ret += (mret + sizeof (struct OutboundMessage));
692 size -= (mret + sizeof (struct OutboundMessage));
693 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
697 /* if there are more pending messages, try to schedule those */
698 schedule_transmission (h);
699 #if DEBUG_TRANSPORT_API
700 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
701 "Transmitting %u bytes to transport service\n", ret);
708 * Schedule the task to send one message, either from the control
709 * list or the peer message queues to the service.
711 * @param cls transport service to schedule a transmission for
712 * @param tc scheduler context
715 schedule_transmission_task (void *cls,
716 const struct GNUNET_SCHEDULER_TaskContext *tc)
718 struct GNUNET_TRANSPORT_Handle *h = cls;
720 struct GNUNET_TRANSPORT_TransmitHandle *th;
723 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
724 GNUNET_assert (NULL != h->client);
725 /* destroy all requests that have timed out */
726 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
727 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
729 /* notify client that the request could not be satisfied within
730 * the given time constraints */
733 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
735 #if DEBUG_TRANSPORT_API
736 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
737 "Signalling timeout for transmission to peer %s due to congestion\n",
738 GNUNET_i2s (&n->id));
740 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
745 if (NULL != h->control_head)
747 size = h->control_head->notify_size;
751 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
753 return; /* no pending messages */
754 size = n->th->notify_size + sizeof (struct OutboundMessage);
756 #if DEBUG_TRANSPORT_API
757 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
760 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
761 GNUNET_TIME_UNIT_FOREVER_REL,
762 GNUNET_NO, &transport_notify_ready,
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 #if DEBUG_TRANSPORT_API
795 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
796 "Scheduling next transmission to service in %llu ms\n",
797 (unsigned long long) delay.rel_value);
800 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
805 * Queue control request for transmission to the transport
808 * @param h handle to the transport service
809 * @param size number of bytes to be transmitted
810 * @param notify function to call to get the content
811 * @param notify_cls closure for notify
814 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
815 GNUNET_CONNECTION_TransmitReadyNotify notify,
818 struct GNUNET_TRANSPORT_TransmitHandle *th;
820 #if DEBUG_TRANSPORT_API
821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
822 "Control transmit of %u bytes requested\n", size);
824 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
826 th->notify_cls = notify_cls;
827 th->notify_size = size;
828 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
829 schedule_transmission (h);
834 * Transmit START message to service.
837 * @param size number of bytes available in buf
838 * @param buf where to copy the message
839 * @return number of bytes copied to buf
842 send_start (void *cls, size_t size, void *buf)
844 struct GNUNET_TRANSPORT_Handle *h = cls;
845 struct StartMessage s;
849 /* Can only be shutdown, just give up */
850 #if DEBUG_TRANSPORT_API
851 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
852 "Shutdown while trying to transmit `%s' request.\n", "START");
856 #if DEBUG_TRANSPORT_API
857 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
859 GNUNET_assert (size >= sizeof (struct StartMessage));
860 s.header.size = htons (sizeof (struct StartMessage));
861 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
862 s.do_check = htonl (h->check_self);
864 memcpy (buf, &s, sizeof (struct StartMessage));
865 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
866 GNUNET_TIME_UNIT_FOREVER_REL);
867 return sizeof (struct StartMessage);
872 * Try again to connect to transport service.
874 * @param cls the handle to the transport service
875 * @param tc scheduler context
878 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
880 struct GNUNET_TRANSPORT_Handle *h = cls;
882 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
883 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
885 /* shutdown, just give up */
888 #if DEBUG_TRANSPORT_API
889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
891 GNUNET_assert (h->client == NULL);
892 GNUNET_assert (h->control_head == NULL);
893 GNUNET_assert (h->control_tail == NULL);
894 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
895 GNUNET_assert (h->client != NULL);
896 if ( (h->rec != NULL) ||
897 (h->nc_cb != NULL) ||
899 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
904 * Function that will schedule the job that will try
905 * to connect us again to the client.
907 * @param h transport service to reconnect
910 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
912 struct GNUNET_TRANSPORT_TransmitHandle *th;
914 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
915 /* Forget about all neighbours that we used to be connected to */
916 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
919 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
922 if (NULL != h->client)
924 GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
927 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
929 GNUNET_SCHEDULER_cancel (h->quota_task);
930 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
932 while ((NULL != (th = h->control_head)))
934 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
935 th->notify (th->notify_cls, 0, NULL);
938 #if DEBUG_TRANSPORT_API
939 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
940 "Scheduling task to reconnect to transport service in %llu ms.\n",
941 h->reconnect_delay.rel_value);
944 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
945 if (h->reconnect_delay.rel_value == 0)
947 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
951 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
953 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->reconnect_delay);
959 * Closure for 'send_set_quota'.
961 struct SetQuotaContext
965 * Identity of the peer impacted by the quota change.
967 struct GNUNET_PeerIdentity target;
972 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
977 * Send SET_QUOTA message to the service.
979 * @param cls the 'struct SetQuotaContext'
980 * @param size number of bytes available in buf
981 * @param buf where to copy the message
982 * @return number of bytes copied to buf
985 send_set_quota (void *cls, size_t size, void *buf)
987 struct SetQuotaContext *sqc = cls;
988 struct QuotaSetMessage msg;
995 #if DEBUG_TRANSPORT_API
996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
997 "Transmitting `%s' request with respect to `%4s'.\n", "SET_QUOTA",
998 GNUNET_i2s (&sqc->target));
1000 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
1001 msg.header.size = htons (sizeof (struct QuotaSetMessage));
1002 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1003 msg.quota = sqc->quota_in;
1004 msg.peer = sqc->target;
1005 memcpy (buf, &msg, sizeof (msg));
1007 return sizeof (struct QuotaSetMessage);
1012 * Set the share of incoming bandwidth for the given
1013 * peer to the specified amount.
1015 * @param handle connection to transport service
1016 * @param target who's bandwidth quota is being changed
1017 * @param quota_in incoming bandwidth quota in bytes per ms
1018 * @param quota_out outgoing bandwidth quota in bytes per ms
1021 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
1022 const struct GNUNET_PeerIdentity *target,
1023 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
1024 struct GNUNET_BANDWIDTH_Value32NBO quota_out)
1026 struct Neighbour *n;
1027 struct SetQuotaContext *sqc;
1029 n = neighbour_find (handle, target);
1032 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1033 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
1034 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1037 GNUNET_assert (NULL != handle->client);
1038 #if DEBUG_TRANSPORT_API
1039 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
1040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1041 "Quota changed from %u to %u for peer `%s'\n",
1042 (unsigned int) n->out_tracker.available_bytes_per_s__,
1043 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1045 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Quota remains at %u for peer `%s'\n",
1046 (unsigned int) n->out_tracker.available_bytes_per_s__,
1047 GNUNET_i2s (target));
1049 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, quota_out);
1050 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
1051 sqc->target = *target;
1052 sqc->quota_in = quota_in;
1053 schedule_control_transmit (handle, sizeof (struct QuotaSetMessage),
1054 &send_set_quota, sqc);
1059 * Send REQUEST_CONNECT message to the service.
1061 * @param cls the 'struct GNUNET_PeerIdentity'
1062 * @param size number of bytes available in buf
1063 * @param buf where to copy the message
1064 * @return number of bytes copied to buf
1067 send_try_connect (void *cls, size_t size, void *buf)
1069 struct GNUNET_PeerIdentity *pid = cls;
1070 struct TransportRequestConnectMessage msg;
1077 #if DEBUG_TRANSPORT_API
1078 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1079 "Transmitting `%s' request with respect to `%4s'.\n",
1080 "REQUEST_CONNECT", GNUNET_i2s (pid));
1082 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1083 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1084 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1085 msg.reserved = htonl (0);
1087 memcpy (buf, &msg, sizeof (msg));
1089 return sizeof (struct TransportRequestConnectMessage);
1094 * Ask the transport service to establish a connection to
1097 * @param handle connection to transport service
1098 * @param target who we should try to connect to
1101 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1102 const struct GNUNET_PeerIdentity *target)
1104 struct GNUNET_PeerIdentity *pid;
1106 if (NULL == handle->client)
1108 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1110 schedule_control_transmit (handle,
1111 sizeof (struct TransportRequestConnectMessage),
1112 &send_try_connect, pid);
1117 * Send HELLO message to the service.
1119 * @param cls the HELLO message to send
1120 * @param size number of bytes available in buf
1121 * @param buf where to copy the message
1122 * @return number of bytes copied to buf
1125 send_hello (void *cls, size_t size, void *buf)
1127 struct GNUNET_MessageHeader *msg = cls;
1132 #if DEBUG_TRANSPORT_TIMEOUT
1133 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1134 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1139 #if DEBUG_TRANSPORT_API
1140 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1142 ssize = ntohs (msg->size);
1143 GNUNET_assert (size >= ssize);
1144 memcpy (buf, msg, ssize);
1151 * Offer the transport service the HELLO of another peer. Note that
1152 * the transport service may just ignore this message if the HELLO is
1153 * malformed or useless due to our local configuration.
1155 * @param handle connection to transport service
1156 * @param hello the hello message
1157 * @param cont continuation to call when HELLO has been sent
1158 * @param cls closure for continuation
1162 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1163 const struct GNUNET_MessageHeader *hello,
1164 GNUNET_SCHEDULER_Task cont, void *cls)
1167 struct GNUNET_PeerIdentity peer;
1168 struct GNUNET_MessageHeader *msg;
1170 if (NULL == handle->client)
1172 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1173 size = ntohs (hello->size);
1174 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1176 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1181 msg = GNUNET_malloc (size);
1182 memcpy (msg, hello, size);
1183 #if DEBUG_TRANSPORT_API
1184 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1185 "Offering `%s' message of `%4s' to transport for validation.\n",
1186 "HELLO", GNUNET_i2s (&peer));
1188 schedule_control_transmit (handle, size, &send_hello, msg);
1193 * Obtain the HELLO message for this peer.
1195 * @param handle connection to transport service
1196 * @param rec function to call with the HELLO, sender will be our peer
1197 * identity; message and sender will be NULL on timeout
1198 * (handshake with transport service pending/failed).
1199 * cost estimate will be 0.
1200 * @param rec_cls closure for rec
1201 * @return handle to cancel the operation
1203 struct GNUNET_TRANSPORT_GetHelloHandle *
1204 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1205 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1208 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1210 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1212 hwl->rec_cls = rec_cls;
1213 hwl->handle = handle;
1214 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1215 if (handle->my_hello != NULL)
1216 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1222 * Stop receiving updates about changes to our HELLO message.
1224 * @param ghh handle to cancel
1227 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1229 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1231 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1237 * Connect to the transport service. Note that the connection may
1238 * complete (or fail) asynchronously.
1240 * @param cfg configuration to use
1241 * @param self our own identity (API should check that it matches
1242 * the identity found by transport), or NULL (no check)
1243 * @param cls closure for the callbacks
1244 * @param rec receive function to call
1245 * @param nc function to call on connect events
1246 * @param nd function to call on disconnect events
1248 struct GNUNET_TRANSPORT_Handle *
1249 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1250 const struct GNUNET_PeerIdentity *self, void *cls,
1251 GNUNET_TRANSPORT_ReceiveCallback rec,
1252 GNUNET_TRANSPORT_NotifyConnect nc,
1253 GNUNET_TRANSPORT_NotifyDisconnect nd)
1255 struct GNUNET_TRANSPORT_Handle *ret;
1257 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1261 ret->check_self = GNUNET_YES;
1268 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1270 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE);
1272 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1273 ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
1279 * Disconnect from the transport service.
1281 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1284 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1286 #if DEBUG_TRANSPORT_API
1287 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1289 /* this disconnects all neighbours... */
1290 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1291 disconnect_and_schedule_reconnect (handle);
1292 /* and now we stop trying to connect again... */
1293 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1295 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1296 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1298 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1299 handle->neighbours = NULL;
1300 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1302 GNUNET_SCHEDULER_cancel (handle->quota_task);
1303 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1305 GNUNET_free_non_null (handle->my_hello);
1306 handle->my_hello = NULL;
1307 GNUNET_assert (handle->hwl_head == NULL);
1308 GNUNET_assert (handle->hwl_tail == NULL);
1309 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1310 handle->ready_heap = NULL;
1311 GNUNET_free (handle);
1316 * Check if we could queue a message of the given size for
1317 * transmission. The transport service will take both its
1318 * internal buffers and bandwidth limits imposed by the
1319 * other peer into consideration when answering this query.
1321 * @param handle connection to transport service
1322 * @param target who should receive the message
1323 * @param size how big is the message we want to transmit?
1324 * @param priority how important is the message?
1325 * @param timeout after how long should we give up (and call
1326 * notify with buf NULL and size 0)?
1327 * @param notify function to call when we are ready to
1328 * send such a message
1329 * @param notify_cls closure for notify
1330 * @return NULL if someone else is already waiting to be notified
1331 * non-NULL if the notify callback was queued (can be used to cancel
1332 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1334 struct GNUNET_TRANSPORT_TransmitHandle *
1335 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1336 const struct GNUNET_PeerIdentity
1337 *target, size_t size, uint32_t priority,
1338 struct GNUNET_TIME_Relative timeout,
1339 GNUNET_CONNECTION_TransmitReadyNotify
1340 notify, void *notify_cls)
1342 struct Neighbour *n;
1343 struct GNUNET_TRANSPORT_TransmitHandle *th;
1344 struct GNUNET_TIME_Relative delay;
1346 n = neighbour_find (handle, target);
1349 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1350 * once a connection has been established */
1356 /* attempt to send two messages at the same time to the same peer */
1360 GNUNET_assert (NULL == n->hn);
1361 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1363 th->notify = notify;
1364 th->notify_cls = notify_cls;
1365 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1366 th->notify_size = size;
1367 th->priority = priority;
1369 /* calculate when our transmission should be ready */
1370 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1371 if (delay.rel_value > timeout.rel_value)
1372 delay.rel_value = 0; /* notify immediately (with failure) */
1373 #if DEBUG_TRANSPORT_API
1374 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1375 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1376 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1378 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1379 schedule_transmission (handle);
1385 * Cancel the specified transmission-ready notification.
1387 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1390 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1391 GNUNET_TRANSPORT_TransmitHandle
1394 struct Neighbour *n;
1396 GNUNET_assert (NULL == th->next);
1397 GNUNET_assert (NULL == th->prev);
1399 GNUNET_assert (th == n->th);
1403 GNUNET_CONTAINER_heap_remove_node (n->hn);
1408 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1409 GNUNET_SCHEDULER_cancel (th->timeout_task);
1410 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1416 /* end of transport_api.c */