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
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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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 GNUNET_break (0 == ntohl (im->reserved));
547 ats_count = ntohl (im->ats_count);
548 imm = (const struct GNUNET_MessageHeader *) &((&(im->ats))[ats_count + 1]);
550 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
551 ats_count * sizeof (struct GNUNET_ATS_Information) != size)
556 #if DEBUG_TRANSPORT_API
557 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message of type %u from `%4s'.\n",
558 ntohs (imm->type), GNUNET_i2s (&im->peer));
560 n = neighbour_find (h, &im->peer);
567 h->rec (h->cls, &im->peer, imm, &im->ats, ats_count);
569 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
570 #if DEBUG_TRANSPORT_API
571 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "SET_QUOTA");
573 if (size != sizeof (struct QuotaSetMessage))
578 qm = (const struct QuotaSetMessage *) msg;
579 n = neighbour_find (h, &qm->peer);
585 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
588 LOG (GNUNET_ERROR_TYPE_ERROR,
589 _("Received unexpected message of type %u in %s:%u\n"),
590 ntohs (msg->type), __FILE__, __LINE__);
598 * A transmission request could not be satisfied because of
599 * network congestion. Notify the initiator and clean up.
601 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
602 * @param tc scheduler context
605 timeout_request_due_to_congestion (void *cls,
606 const struct GNUNET_SCHEDULER_TaskContext
609 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
610 struct Neighbour *n = th->neighbour;
612 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
613 GNUNET_assert (th == n->th);
614 GNUNET_assert (NULL == n->hn);
616 th->notify (th->notify_cls, 0, NULL);
622 * Transmit message(s) to service.
624 * @param cls handle to transport
625 * @param size number of bytes available in buf
626 * @param buf where to copy the message
627 * @return number of bytes copied to buf
630 transport_notify_ready (void *cls, size_t size, void *buf)
632 struct GNUNET_TRANSPORT_Handle *h = cls;
633 struct GNUNET_TRANSPORT_TransmitHandle *th;
636 struct OutboundMessage obm;
641 GNUNET_assert (NULL != h->client);
645 /* transmission failed */
646 disconnect_and_schedule_reconnect (h);
652 /* first send control messages */
653 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
655 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
656 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
657 #if DEBUG_TRANSPORT_API
658 LOG (GNUNET_ERROR_TYPE_DEBUG, "Added %u bytes of control message at %u\n",
666 /* then, if possible and no control messages pending, send data messages */
667 while ((NULL == h->control_head) &&
668 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
670 if (GNUNET_YES != n->is_ready)
672 /* peer not ready, wait for notification! */
673 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
675 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
676 n->th->timeout_task =
677 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
679 &timeout_request_due_to_congestion,
684 if (th->notify_size + sizeof (struct OutboundMessage) > size)
685 break; /* does not fit */
686 if (GNUNET_BANDWIDTH_tracker_get_delay
687 (&n->out_tracker, th->notify_size).rel_value > 0)
688 break; /* too early */
689 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
692 n->is_ready = GNUNET_NO;
693 GNUNET_assert (size >= sizeof (struct OutboundMessage));
695 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
696 &cbuf[ret + sizeof (struct OutboundMessage)]);
697 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
700 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
701 GNUNET_SERVER_MAX_MESSAGE_SIZE);
702 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
703 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
704 obm.priority = htonl (th->priority);
706 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
709 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
710 ret += (mret + sizeof (struct OutboundMessage));
711 size -= (mret + sizeof (struct OutboundMessage));
712 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
716 /* if there are more pending messages, try to schedule those */
717 schedule_transmission (h);
718 #if DEBUG_TRANSPORT_API
719 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to transport service\n",
727 * Schedule the task to send one message, either from the control
728 * list or the peer message queues to the service.
730 * @param cls transport service to schedule a transmission for
731 * @param tc scheduler context
734 schedule_transmission_task (void *cls,
735 const struct GNUNET_SCHEDULER_TaskContext *tc)
737 struct GNUNET_TRANSPORT_Handle *h = cls;
739 struct GNUNET_TRANSPORT_TransmitHandle *th;
742 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
743 GNUNET_assert (NULL != h->client);
744 /* destroy all requests that have timed out */
745 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
746 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
748 /* notify client that the request could not be satisfied within
749 * the given time constraints */
752 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
754 #if DEBUG_TRANSPORT_API
755 LOG (GNUNET_ERROR_TYPE_DEBUG,
756 "Signalling timeout for transmission to peer %s due to congestion\n",
757 GNUNET_i2s (&n->id));
759 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
764 if (NULL != h->control_head)
766 size = h->control_head->notify_size;
770 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
772 return; /* no pending messages */
773 size = n->th->notify_size + sizeof (struct OutboundMessage);
775 #if DEBUG_TRANSPORT_API
776 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
779 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
780 GNUNET_TIME_UNIT_FOREVER_REL,
781 GNUNET_NO, &transport_notify_ready,
783 GNUNET_assert (NULL != h->cth);
788 * Schedule the task to send one message, either from the control
789 * list or the peer message queues to the service.
791 * @param h transport service to schedule a transmission for
794 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
796 struct GNUNET_TIME_Relative delay;
799 GNUNET_assert (NULL != h->client);
800 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
802 GNUNET_SCHEDULER_cancel (h->quota_task);
803 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
805 if (NULL != h->control_head)
806 delay = GNUNET_TIME_UNIT_ZERO;
807 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
809 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
812 return; /* no work to be done */
813 #if DEBUG_TRANSPORT_API
814 LOG (GNUNET_ERROR_TYPE_DEBUG,
815 "Scheduling next transmission to service in %llu ms\n",
816 (unsigned long long) delay.rel_value);
819 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
824 * Queue control request for transmission to the transport
827 * @param h handle to the transport service
828 * @param size number of bytes to be transmitted
829 * @param notify function to call to get the content
830 * @param notify_cls closure for notify
833 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
834 GNUNET_CONNECTION_TransmitReadyNotify notify,
837 struct GNUNET_TRANSPORT_TransmitHandle *th;
839 #if DEBUG_TRANSPORT_API
840 LOG (GNUNET_ERROR_TYPE_DEBUG, "Control transmit of %u bytes requested\n",
843 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
845 th->notify_cls = notify_cls;
846 th->notify_size = size;
847 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
848 schedule_transmission (h);
853 * Transmit START message to service.
856 * @param size number of bytes available in buf
857 * @param buf where to copy the message
858 * @return number of bytes copied to buf
861 send_start (void *cls, size_t size, void *buf)
863 struct GNUNET_TRANSPORT_Handle *h = cls;
864 struct StartMessage s;
868 /* Can only be shutdown, just give up */
869 #if DEBUG_TRANSPORT_API
870 LOG (GNUNET_ERROR_TYPE_DEBUG,
871 "Shutdown while trying to transmit `%s' request.\n", "START");
875 #if DEBUG_TRANSPORT_API
876 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
878 GNUNET_assert (size >= sizeof (struct StartMessage));
879 s.header.size = htons (sizeof (struct StartMessage));
880 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
881 s.do_check = htonl (h->check_self);
883 memcpy (buf, &s, sizeof (struct StartMessage));
884 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
885 GNUNET_TIME_UNIT_FOREVER_REL);
886 return sizeof (struct StartMessage);
891 * Try again to connect to transport service.
893 * @param cls the handle to the transport service
894 * @param tc scheduler context
897 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
899 struct GNUNET_TRANSPORT_Handle *h = cls;
901 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
902 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
904 /* shutdown, just give up */
907 #if DEBUG_TRANSPORT_API
908 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
910 GNUNET_assert (h->client == NULL);
911 GNUNET_assert (h->control_head == NULL);
912 GNUNET_assert (h->control_tail == NULL);
913 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
914 GNUNET_assert (h->client != NULL);
915 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
920 * Function that will schedule the job that will try
921 * to connect us again to the client.
923 * @param h transport service to reconnect
926 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
928 struct GNUNET_TRANSPORT_TransmitHandle *th;
930 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
931 /* Forget about all neighbours that we used to be connected to */
932 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
935 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
938 if (NULL != h->client)
940 GNUNET_CLIENT_disconnect (h->client, GNUNET_YES);
943 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
945 GNUNET_SCHEDULER_cancel (h->quota_task);
946 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
948 while ((NULL != (th = h->control_head)))
950 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
951 th->notify (th->notify_cls, 0, NULL);
954 #if DEBUG_TRANSPORT_API
955 LOG (GNUNET_ERROR_TYPE_DEBUG,
956 "Scheduling task to reconnect to transport service in %llu ms.\n",
957 h->reconnect_delay.rel_value);
960 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
961 if (h->reconnect_delay.rel_value == 0)
963 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
967 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
969 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->reconnect_delay);
975 * Closure for 'send_set_quota'.
977 struct SetQuotaContext
981 * Identity of the peer impacted by the quota change.
983 struct GNUNET_PeerIdentity target;
988 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
993 * Send SET_QUOTA message to the service.
995 * @param cls the 'struct SetQuotaContext'
996 * @param size number of bytes available in buf
997 * @param buf where to copy the message
998 * @return number of bytes copied to buf
1001 send_set_quota (void *cls, size_t size, void *buf)
1003 struct SetQuotaContext *sqc = cls;
1004 struct QuotaSetMessage msg;
1011 #if DEBUG_TRANSPORT_API
1012 LOG (GNUNET_ERROR_TYPE_DEBUG,
1013 "Transmitting `%s' request with respect to `%4s'.\n", "SET_QUOTA",
1014 GNUNET_i2s (&sqc->target));
1016 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
1017 msg.header.size = htons (sizeof (struct QuotaSetMessage));
1018 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
1019 msg.quota = sqc->quota_in;
1020 msg.peer = sqc->target;
1021 memcpy (buf, &msg, sizeof (msg));
1023 return sizeof (struct QuotaSetMessage);
1028 * Set the share of incoming bandwidth for the given
1029 * peer to the specified amount.
1031 * @param handle connection to transport service
1032 * @param target who's bandwidth quota is being changed
1033 * @param quota_in incoming bandwidth quota in bytes per ms
1034 * @param quota_out outgoing bandwidth quota in bytes per ms
1037 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
1038 const struct GNUNET_PeerIdentity *target,
1039 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
1040 struct GNUNET_BANDWIDTH_Value32NBO quota_out)
1042 struct Neighbour *n;
1043 struct SetQuotaContext *sqc;
1045 n = neighbour_find (handle, target);
1048 LOG (GNUNET_ERROR_TYPE_ERROR,
1049 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
1050 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1053 GNUNET_assert (NULL != handle->client);
1054 #if DEBUG_TRANSPORT_API
1055 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
1056 LOG (GNUNET_ERROR_TYPE_DEBUG, "Quota changed from %u to %u for peer `%s'\n",
1057 (unsigned int) n->out_tracker.available_bytes_per_s__,
1058 (unsigned int) ntohl (quota_out.value__), GNUNET_i2s (target));
1060 LOG (GNUNET_ERROR_TYPE_DEBUG, "Quota remains at %u for peer `%s'\n",
1061 (unsigned int) n->out_tracker.available_bytes_per_s__,
1062 GNUNET_i2s (target));
1064 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, quota_out);
1065 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
1066 sqc->target = *target;
1067 sqc->quota_in = quota_in;
1068 schedule_control_transmit (handle, sizeof (struct QuotaSetMessage),
1069 &send_set_quota, sqc);
1074 * Send REQUEST_CONNECT message to the service.
1076 * @param cls the 'struct GNUNET_PeerIdentity'
1077 * @param size number of bytes available in buf
1078 * @param buf where to copy the message
1079 * @return number of bytes copied to buf
1082 send_try_connect (void *cls, size_t size, void *buf)
1084 struct GNUNET_PeerIdentity *pid = cls;
1085 struct TransportRequestConnectMessage msg;
1092 #if DEBUG_TRANSPORT_API
1093 LOG (GNUNET_ERROR_TYPE_DEBUG,
1094 "Transmitting `%s' request with respect to `%4s'.\n", "REQUEST_CONNECT",
1097 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1098 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1099 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1100 msg.reserved = htonl (0);
1102 memcpy (buf, &msg, sizeof (msg));
1104 return sizeof (struct TransportRequestConnectMessage);
1109 * Ask the transport service to establish a connection to
1112 * @param handle connection to transport service
1113 * @param target who we should try to connect to
1116 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1117 const struct GNUNET_PeerIdentity *target)
1119 struct GNUNET_PeerIdentity *pid;
1121 if (NULL == handle->client)
1123 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1125 schedule_control_transmit (handle,
1126 sizeof (struct TransportRequestConnectMessage),
1127 &send_try_connect, pid);
1132 * Send HELLO message to the service.
1134 * @param cls the HELLO message to send
1135 * @param size number of bytes available in buf
1136 * @param buf where to copy the message
1137 * @return number of bytes copied to buf
1140 send_hello (void *cls, size_t size, void *buf)
1142 struct GNUNET_MessageHeader *msg = cls;
1147 #if DEBUG_TRANSPORT_TIMEOUT
1148 LOG (GNUNET_ERROR_TYPE_DEBUG,
1149 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1154 #if DEBUG_TRANSPORT_API
1155 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1157 ssize = ntohs (msg->size);
1158 GNUNET_assert (size >= ssize);
1159 memcpy (buf, msg, ssize);
1166 * Offer the transport service the HELLO of another peer. Note that
1167 * the transport service may just ignore this message if the HELLO is
1168 * malformed or useless due to our local configuration.
1170 * @param handle connection to transport service
1171 * @param hello the hello message
1172 * @param cont continuation to call when HELLO has been sent
1173 * @param cls closure for continuation
1177 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1178 const struct GNUNET_MessageHeader *hello,
1179 GNUNET_SCHEDULER_Task cont, void *cls)
1182 struct GNUNET_PeerIdentity peer;
1183 struct GNUNET_MessageHeader *msg;
1185 if (NULL == handle->client)
1187 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1188 size = ntohs (hello->size);
1189 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1191 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1196 msg = GNUNET_malloc (size);
1197 memcpy (msg, hello, size);
1198 #if DEBUG_TRANSPORT_API
1199 LOG (GNUNET_ERROR_TYPE_DEBUG,
1200 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1201 GNUNET_i2s (&peer));
1203 schedule_control_transmit (handle, size, &send_hello, msg);
1208 * Obtain the HELLO message for this peer.
1210 * @param handle connection to transport service
1211 * @param rec function to call with the HELLO, sender will be our peer
1212 * identity; message and sender will be NULL on timeout
1213 * (handshake with transport service pending/failed).
1214 * cost estimate will be 0.
1215 * @param rec_cls closure for rec
1216 * @return handle to cancel the operation
1218 struct GNUNET_TRANSPORT_GetHelloHandle *
1219 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1220 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1223 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1225 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1227 hwl->rec_cls = rec_cls;
1228 hwl->handle = handle;
1229 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1230 if (handle->my_hello != NULL)
1231 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1237 * Stop receiving updates about changes to our HELLO message.
1239 * @param ghh handle to cancel
1242 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1244 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1246 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1252 * Connect to the transport service. Note that the connection may
1253 * complete (or fail) asynchronously.
1255 * @param cfg configuration to use
1256 * @param self our own identity (API should check that it matches
1257 * the identity found by transport), or NULL (no check)
1258 * @param cls closure for the callbacks
1259 * @param rec receive function to call
1260 * @param nc function to call on connect events
1261 * @param nd function to call on disconnect events
1263 struct GNUNET_TRANSPORT_Handle *
1264 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1265 const struct GNUNET_PeerIdentity *self, void *cls,
1266 GNUNET_TRANSPORT_ReceiveCallback rec,
1267 GNUNET_TRANSPORT_NotifyConnect nc,
1268 GNUNET_TRANSPORT_NotifyDisconnect nd)
1270 struct GNUNET_TRANSPORT_Handle *ret;
1272 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1276 ret->check_self = GNUNET_YES;
1283 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1285 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE);
1287 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1288 ret->reconnect_task = GNUNET_SCHEDULER_add_now (&reconnect, ret);
1294 * Disconnect from the transport service.
1296 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1299 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1301 #if DEBUG_TRANSPORT_API
1302 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1304 /* this disconnects all neighbours... */
1305 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1306 disconnect_and_schedule_reconnect (handle);
1307 /* and now we stop trying to connect again... */
1308 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1310 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1311 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1313 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1314 handle->neighbours = NULL;
1315 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1317 GNUNET_SCHEDULER_cancel (handle->quota_task);
1318 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1320 GNUNET_free_non_null (handle->my_hello);
1321 handle->my_hello = NULL;
1322 GNUNET_assert (handle->hwl_head == NULL);
1323 GNUNET_assert (handle->hwl_tail == NULL);
1324 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1325 handle->ready_heap = NULL;
1326 GNUNET_free (handle);
1331 * Check if we could queue a message of the given size for
1332 * transmission. The transport service will take both its
1333 * internal buffers and bandwidth limits imposed by the
1334 * other peer into consideration when answering this query.
1336 * @param handle connection to transport service
1337 * @param target who should receive the message
1338 * @param size how big is the message we want to transmit?
1339 * @param priority how important is the message?
1340 * @param timeout after how long should we give up (and call
1341 * notify with buf NULL and size 0)?
1342 * @param notify function to call when we are ready to
1343 * send such a message
1344 * @param notify_cls closure for notify
1345 * @return NULL if someone else is already waiting to be notified
1346 * non-NULL if the notify callback was queued (can be used to cancel
1347 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1349 struct GNUNET_TRANSPORT_TransmitHandle *
1350 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1351 const struct GNUNET_PeerIdentity
1352 *target, size_t size, uint32_t priority,
1353 struct GNUNET_TIME_Relative timeout,
1354 GNUNET_CONNECTION_TransmitReadyNotify
1355 notify, void *notify_cls)
1357 struct Neighbour *n;
1358 struct GNUNET_TRANSPORT_TransmitHandle *th;
1359 struct GNUNET_TIME_Relative delay;
1361 n = neighbour_find (handle, target);
1364 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1365 * once a connection has been established */
1371 /* attempt to send two messages at the same time to the same peer */
1375 GNUNET_assert (NULL == n->hn);
1376 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1378 th->notify = notify;
1379 th->notify_cls = notify_cls;
1380 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1381 th->notify_size = size;
1382 th->priority = priority;
1384 /* calculate when our transmission should be ready */
1385 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1386 if (delay.rel_value > timeout.rel_value)
1387 delay.rel_value = 0; /* notify immediately (with failure) */
1388 #if DEBUG_TRANSPORT_API
1389 LOG (GNUNET_ERROR_TYPE_DEBUG,
1390 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1391 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1393 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1394 schedule_transmission (handle);
1400 * Cancel the specified transmission-ready notification.
1402 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1405 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1406 GNUNET_TRANSPORT_TransmitHandle
1409 struct Neighbour *n;
1411 GNUNET_assert (NULL == th->next);
1412 GNUNET_assert (NULL == th->prev);
1414 GNUNET_assert (th == n->th);
1418 GNUNET_CONTAINER_heap_remove_node (n->hn);
1423 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1424 GNUNET_SCHEDULER_cancel (th->timeout_task);
1425 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1431 /* end of transport_api.c */