2 This file is part of GNUnet.
3 (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
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,
18 Boston, MA 02111-1307, USA.
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_constants.h"
33 #include "gnunet_bandwidth_lib.h"
34 #include "gnunet_client_lib.h"
35 #include "gnunet_constants.h"
36 #include "gnunet_container_lib.h"
37 #include "gnunet_arm_service.h"
38 #include "gnunet_hello_lib.h"
39 #include "gnunet_protocols.h"
40 #include "gnunet_server_lib.h"
41 #include "gnunet_time_lib.h"
42 #include "gnunet_transport_service.h"
43 #include "transport.h"
45 #define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)
48 * How large to start with for the hashmap of neighbours.
50 #define STARTING_NEIGHBOURS_SIZE 16
53 * Handle for a message that should be transmitted to the service.
54 * Used for both control messages and normal messages.
56 struct GNUNET_TRANSPORT_TransmitHandle
60 * We keep all requests in a DLL.
62 struct GNUNET_TRANSPORT_TransmitHandle *next;
65 * We keep all requests in a DLL.
67 struct GNUNET_TRANSPORT_TransmitHandle *prev;
70 * Neighbour for this handle, NULL for control messages.
72 struct Neighbour *neighbour;
75 * Function to call when notify_size bytes are available
78 GNUNET_CONNECTION_TransmitReadyNotify notify;
86 * Timeout for this request, 0 for control messages.
88 struct GNUNET_TIME_Absolute timeout;
91 * Task to trigger request timeout if the request is stalled due to
94 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
97 * How many bytes is our notify callback waiting for?
102 * How important is this message? Not used for control messages.
110 * Entry in hash table of all of our current neighbours.
115 * Overall transport handle.
117 struct GNUNET_TRANSPORT_Handle *h;
120 * Active transmit handle or NULL.
122 struct GNUNET_TRANSPORT_TransmitHandle *th;
125 * Identity of this neighbour.
127 struct GNUNET_PeerIdentity id;
130 * Outbound bandwidh tracker.
132 struct GNUNET_BANDWIDTH_Tracker out_tracker;
135 * Entry in our readyness heap (which is sorted by 'next_ready'
136 * value). NULL if there is no pending transmission request for
137 * this neighbour or if we're waiting for 'is_ready' to become
138 * true AFTER the 'out_tracker' suggested that this peer's quota
139 * has been satisfied (so once 'is_ready' goes to GNUNET_YES,
140 * we should immediately go back into the heap).
142 struct GNUNET_CONTAINER_HeapNode *hn;
145 * Is this peer currently ready to receive a message?
150 * Sending consumed more bytes on wire than payload was announced
151 * This overhead is added to the delay of next sending operation
153 size_t traffic_overhead;
158 * Linked list of functions to call whenever our HELLO is updated.
160 struct GNUNET_TRANSPORT_GetHelloHandle
164 * This is a doubly linked list.
166 struct GNUNET_TRANSPORT_GetHelloHandle *next;
169 * This is a doubly linked list.
171 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
176 struct GNUNET_TRANSPORT_Handle *handle;
179 * Callback to call once we got our HELLO.
181 GNUNET_TRANSPORT_HelloUpdateCallback rec;
192 * Handle for the transport service (includes all of the
193 * state for the transport service).
195 struct GNUNET_TRANSPORT_Handle
199 * Closure for the callbacks.
204 * Function to call for received data.
206 GNUNET_TRANSPORT_ReceiveCallback rec;
209 * function to call on connect events
211 GNUNET_TRANSPORT_NotifyConnect nc_cb;
214 * function to call on disconnect events
216 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
219 * Head of DLL of control messages.
221 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
224 * Tail of DLL of control messages.
226 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
229 * The current HELLO message for this peer. Updated
230 * whenever transports change their addresses.
232 struct GNUNET_HELLO_Message *my_hello;
235 * My client connection to the transport service.
237 struct GNUNET_CLIENT_Connection *client;
240 * Handle to our registration with the client for notification.
242 struct GNUNET_CLIENT_TransmitHandle *cth;
245 * Linked list of pending requests for our HELLO.
247 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
250 * Linked list of pending requests for our HELLO.
252 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
257 const struct GNUNET_CONFIGURATION_Handle *cfg;
260 * Hash map of the current connected neighbours of this peer.
261 * Maps peer identities to 'struct Neighbour' entries.
263 struct GNUNET_CONTAINER_MultiHashMap *neighbours;
266 * Heap sorting peers with pending messages by the timestamps that
267 * specify when we could next send a message to the respective peer.
268 * Excludes control messages (which can always go out immediately).
269 * Maps time stamps to 'struct Neighbour' entries.
271 struct GNUNET_CONTAINER_Heap *ready_heap;
274 * Peer identity as assumed by this process, or all zeros.
276 struct GNUNET_PeerIdentity self;
279 * ID of the task trying to reconnect to the service.
281 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
284 * ID of the task trying to trigger transmission for a peer while
285 * maintaining bandwidth quotas. In use if there are no control
286 * messages and the smallest entry in the 'ready_heap' has a time
287 * stamp in the future.
289 GNUNET_SCHEDULER_TaskIdentifier quota_task;
292 * Delay until we try to reconnect.
294 struct GNUNET_TIME_Relative reconnect_delay;
297 * Should we check that 'self' matches what the service thinks?
298 * (if GNUNET_NO, then 'self' is all zeros!).
305 * Schedule the task to send one message, either from the control
306 * list or the peer message queues to the service.
308 * @param h transport service to schedule a transmission for
311 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
315 * Function that will schedule the job that will try
316 * to connect us again to the client.
318 * @param h transport service to reconnect
321 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
325 * Get the neighbour list entry for the given peer
327 * @param h our context
328 * @param peer peer to look up
329 * @return NULL if no such peer entry exists
331 static struct Neighbour *
332 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
333 const struct GNUNET_PeerIdentity *peer)
335 return GNUNET_CONTAINER_multihashmap_get (h->neighbours, &peer->hashPubKey);
340 * Add neighbour to our list
342 * @return NULL if this API is currently disconnecting from the service
344 static struct Neighbour *
345 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
346 const struct GNUNET_PeerIdentity *pid)
350 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating entry for neighbour `%4s'.\n",
352 n = GNUNET_malloc (sizeof (struct Neighbour));
355 n->is_ready = GNUNET_YES;
356 n->traffic_overhead = 0;
357 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
358 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
359 MAX_BANDWIDTH_CARRY_S);
360 GNUNET_assert (GNUNET_OK ==
361 GNUNET_CONTAINER_multihashmap_put (h->neighbours,
362 &n->id.hashPubKey, n,
363 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
369 * Iterator over hash map entries, for deleting state of a neighbour.
371 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
372 * @param key peer identity
373 * @param value value in the hash map, the neighbour entry to delete
374 * @return GNUNET_YES if we should continue to
379 neighbour_delete (void *cls, const struct GNUNET_HashCode * key, void *value)
381 struct GNUNET_TRANSPORT_Handle *handle = cls;
382 struct Neighbour *n = value;
384 if (NULL != handle->nd_cb)
385 handle->nd_cb (handle->cls, &n->id);
386 GNUNET_assert (NULL == n->th);
387 GNUNET_assert (NULL == n->hn);
388 GNUNET_assert (GNUNET_YES ==
389 GNUNET_CONTAINER_multihashmap_remove (handle->neighbours, key,
397 * Function we use for handling incoming messages.
399 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
400 * @param msg message received, NULL on timeout or fatal error
403 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
405 struct GNUNET_TRANSPORT_Handle *h = cls;
406 const struct DisconnectInfoMessage *dim;
407 const struct ConnectInfoMessage *cim;
408 const struct InboundMessage *im;
409 const struct GNUNET_MessageHeader *imm;
410 const struct SendOkMessage *okm;
411 const struct QuotaSetMessage *qm;
412 const struct GNUNET_ATS_Information *ats;
413 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
414 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
416 struct GNUNET_PeerIdentity me;
420 uint32_t bytes_physical;
422 GNUNET_assert (h->client != NULL);
425 LOG (GNUNET_ERROR_TYPE_DEBUG,
426 "Error receiving from transport service, disconnecting temporarily.\n");
427 disconnect_and_schedule_reconnect (h);
430 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
431 GNUNET_TIME_UNIT_FOREVER_REL);
432 size = ntohs (msg->size);
433 switch (ntohs (msg->type))
435 case GNUNET_MESSAGE_TYPE_HELLO:
437 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg, &me))
442 LOG (GNUNET_ERROR_TYPE_DEBUG,
443 "Receiving (my own) `%s' message, I am `%4s'.\n", "HELLO",
445 GNUNET_free_non_null (h->my_hello);
447 if (size < sizeof (struct GNUNET_MessageHeader))
452 h->my_hello = GNUNET_malloc (size);
453 memcpy (h->my_hello, msg, size);
457 next_hwl = hwl->next;
458 hwl->rec (hwl->rec_cls,
459 (const struct GNUNET_MessageHeader *) h->my_hello);
463 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
464 if (size < sizeof (struct ConnectInfoMessage))
469 cim = (const struct ConnectInfoMessage *) msg;
470 ats_count = ntohl (cim->ats_count);
472 sizeof (struct ConnectInfoMessage) +
473 ats_count * sizeof (struct GNUNET_ATS_Information))
478 ats = (const struct GNUNET_ATS_Information *) &cim[1];
479 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
480 "CONNECT", GNUNET_i2s (&cim->id));
481 n = neighbour_find (h, &cim->id);
487 n = neighbour_add (h, &cim->id);
488 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
489 "CONNECT", GNUNET_i2s (&cim->id), ntohl (cim->quota_out.value__));
490 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, cim->quota_out);
491 if (h->nc_cb != NULL)
492 h->nc_cb (h->cls, &n->id, ats, ats_count);
494 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
495 if (size != sizeof (struct DisconnectInfoMessage))
500 dim = (const struct DisconnectInfoMessage *) msg;
501 GNUNET_break (ntohl (dim->reserved) == 0);
502 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s'.\n",
503 "DISCONNECT", GNUNET_i2s (&dim->peer));
504 n = neighbour_find (h, &dim->peer);
510 neighbour_delete (h, &dim->peer.hashPubKey, n);
512 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
513 if (size != sizeof (struct SendOkMessage))
518 okm = (const struct SendOkMessage *) msg;
519 bytes_msg = ntohl (okm->bytes_msg);
520 bytes_physical = ntohl (okm->bytes_physical);
521 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message, transmission %s.\n",
522 "SEND_OK", ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
524 n = neighbour_find (h, &okm->peer);
528 GNUNET_assert (0 == n->traffic_overhead);
529 if (bytes_physical >= bytes_msg)
531 LOG (GNUNET_ERROR_TYPE_DEBUG, "Overhead for %u byte message: %u \n",
532 bytes_msg, bytes_physical - bytes_msg);
533 n->traffic_overhead = bytes_physical - bytes_msg;
535 GNUNET_break (GNUNET_NO == n->is_ready);
536 n->is_ready = GNUNET_YES;
537 if ((n->th != NULL) && (n->hn == NULL))
539 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != n->th->timeout_task);
540 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
541 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
542 /* we've been waiting for this (congestion, not quota,
543 * caused delayed transmission) */
544 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
545 schedule_transmission (h);
548 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
549 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "RECV");
551 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
556 im = (const struct InboundMessage *) msg;
557 ats_count = ntohl (im->ats_count);
558 ats = (const struct GNUNET_ATS_Information *) &im[1];
559 imm = (const struct GNUNET_MessageHeader *) &ats[ats_count];
560 if (ntohs (imm->size) + sizeof (struct InboundMessage) +
561 ats_count * sizeof (struct GNUNET_ATS_Information) != size)
566 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received message of type %u from `%4s'.\n",
567 ntohs (imm->type), GNUNET_i2s (&im->peer));
568 n = neighbour_find (h, &im->peer);
575 h->rec (h->cls, &im->peer, imm, ats, ats_count);
577 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
578 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message.\n", "SET_QUOTA");
579 if (size != sizeof (struct QuotaSetMessage))
584 qm = (const struct QuotaSetMessage *) msg;
585 n = neighbour_find (h, &qm->peer);
588 LOG (GNUNET_ERROR_TYPE_DEBUG, "Receiving `%s' message for `%4s' with quota %u\n",
589 "SET_QUOTA", GNUNET_i2s (&qm->peer), ntohl (qm->quota.value__));
590 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker, qm->quota);
593 LOG (GNUNET_ERROR_TYPE_ERROR,
594 _("Received unexpected message of type %u in %s:%u\n"),
595 ntohs (msg->type), __FILE__, __LINE__);
603 * A transmission request could not be satisfied because of
604 * network congestion. Notify the initiator and clean up.
606 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle'
607 * @param tc scheduler context
610 timeout_request_due_to_congestion (void *cls,
611 const struct GNUNET_SCHEDULER_TaskContext
614 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
615 struct Neighbour *n = th->neighbour;
617 n->th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
618 GNUNET_assert (th == n->th);
619 GNUNET_assert (NULL == n->hn);
621 th->notify (th->notify_cls, 0, NULL);
627 * Transmit message(s) to service.
629 * @param cls handle to transport
630 * @param size number of bytes available in buf
631 * @param buf where to copy the message
632 * @return number of bytes copied to buf
635 transport_notify_ready (void *cls, size_t size, void *buf)
637 struct GNUNET_TRANSPORT_Handle *h = cls;
638 struct GNUNET_TRANSPORT_TransmitHandle *th;
641 struct OutboundMessage obm;
646 GNUNET_assert (NULL != h->client);
650 /* transmission failed */
651 disconnect_and_schedule_reconnect (h);
657 /* first send control messages */
658 while ((NULL != (th = h->control_head)) && (th->notify_size <= size))
660 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
661 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "Added %u bytes of control message at %u\n",
669 /* then, if possible and no control messages pending, send data messages */
670 while ((NULL == h->control_head) &&
671 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
673 if (GNUNET_YES != n->is_ready)
675 /* peer not ready, wait for notification! */
676 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
678 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK == n->th->timeout_task);
679 n->th->timeout_task =
680 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
682 &timeout_request_due_to_congestion,
687 if (th->notify_size + sizeof (struct OutboundMessage) > size)
688 break; /* does not fit */
689 if (GNUNET_BANDWIDTH_tracker_get_delay
690 (&n->out_tracker, th->notify_size).rel_value > 0)
691 break; /* too early */
692 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
695 n->is_ready = GNUNET_NO;
696 GNUNET_assert (size >= sizeof (struct OutboundMessage));
698 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
699 &cbuf[ret + sizeof (struct OutboundMessage)]);
700 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
703 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
704 GNUNET_SERVER_MAX_MESSAGE_SIZE);
705 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
706 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
707 obm.priority = htonl (th->priority);
709 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
712 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
713 ret += (mret + sizeof (struct OutboundMessage));
714 size -= (mret + sizeof (struct OutboundMessage));
715 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
719 /* if there are more pending messages, try to schedule those */
720 schedule_transmission (h);
721 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to transport service\n",
728 * Schedule the task to send one message, either from the control
729 * list or the peer message queues to the service.
731 * @param cls transport service to schedule a transmission for
732 * @param tc scheduler context
735 schedule_transmission_task (void *cls,
736 const struct GNUNET_SCHEDULER_TaskContext *tc)
738 struct GNUNET_TRANSPORT_Handle *h = cls;
740 struct GNUNET_TRANSPORT_TransmitHandle *th;
743 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
744 GNUNET_assert (NULL != h->client);
745 /* destroy all requests that have timed out */
746 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
747 (GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value == 0))
749 /* notify client that the request could not be satisfied within
750 * the given time constraints */
753 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
755 LOG (GNUNET_ERROR_TYPE_DEBUG,
756 "Signalling timeout for transmission to peer %s due to congestion\n",
757 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 LOG (GNUNET_ERROR_TYPE_DEBUG, "Calling notify_transmit_ready\n");
776 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
777 GNUNET_TIME_UNIT_FOREVER_REL,
778 GNUNET_NO, &transport_notify_ready,
780 GNUNET_assert (NULL != h->cth);
785 * Schedule the task to send one message, either from the control
786 * list or the peer message queues to the service.
788 * @param h transport service to schedule a transmission for
791 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
793 struct GNUNET_TIME_Relative delay;
796 GNUNET_assert (NULL != h->client);
797 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
799 GNUNET_SCHEDULER_cancel (h->quota_task);
800 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
802 if (NULL != h->control_head)
803 delay = GNUNET_TIME_UNIT_ZERO;
804 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
807 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
808 n->th->notify_size + n->traffic_overhead);
809 n->traffic_overhead = 0;
812 return; /* no work to be done */
813 LOG (GNUNET_ERROR_TYPE_DEBUG,
814 "Scheduling next transmission to service in %llu ms\n",
815 (unsigned long long) delay.rel_value);
817 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
822 * Queue control request for transmission to the transport
825 * @param h handle to the transport service
826 * @param size number of bytes to be transmitted
827 * @param notify function to call to get the content
828 * @param notify_cls closure for notify
831 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h, size_t size,
832 GNUNET_CONNECTION_TransmitReadyNotify notify,
835 struct GNUNET_TRANSPORT_TransmitHandle *th;
837 LOG (GNUNET_ERROR_TYPE_DEBUG, "Control transmit of %u bytes requested\n",
839 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
841 th->notify_cls = notify_cls;
842 th->notify_size = size;
843 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
844 schedule_transmission (h);
849 * Transmit START message to service.
852 * @param size number of bytes available in buf
853 * @param buf where to copy the message
854 * @return number of bytes copied to buf
857 send_start (void *cls, size_t size, void *buf)
859 struct GNUNET_TRANSPORT_Handle *h = cls;
860 struct StartMessage s;
865 /* Can only be shutdown, just give up */
866 LOG (GNUNET_ERROR_TYPE_DEBUG,
867 "Shutdown while trying to transmit `%s' request.\n", "START");
870 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "START");
871 GNUNET_assert (size >= sizeof (struct StartMessage));
872 s.header.size = htons (sizeof (struct StartMessage));
873 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
879 s.options = htonl (options);
881 memcpy (buf, &s, sizeof (struct StartMessage));
882 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
883 GNUNET_TIME_UNIT_FOREVER_REL);
884 return sizeof (struct StartMessage);
889 * Try again to connect to transport service.
891 * @param cls the handle to the transport service
892 * @param tc scheduler context
895 reconnect (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
897 struct GNUNET_TRANSPORT_Handle *h = cls;
899 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
900 if ((tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
902 /* shutdown, just give up */
905 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
906 GNUNET_assert (h->client == NULL);
907 GNUNET_assert (h->control_head == NULL);
908 GNUNET_assert (h->control_tail == NULL);
909 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
910 GNUNET_assert (h->client != NULL);
911 schedule_control_transmit (h, sizeof (struct StartMessage), &send_start, h);
916 * Function that will schedule the job that will try
917 * to connect us again to the client.
919 * @param h transport service to reconnect
922 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
924 struct GNUNET_TRANSPORT_TransmitHandle *th;
926 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
929 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
932 if (NULL != h->client)
934 GNUNET_CLIENT_disconnect (h->client);
937 /* Forget about all neighbours that we used to be connected to */
938 GNUNET_CONTAINER_multihashmap_iterate (h->neighbours, &neighbour_delete, h);
939 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
941 GNUNET_SCHEDULER_cancel (h->quota_task);
942 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
944 while ((NULL != (th = h->control_head)))
946 GNUNET_CONTAINER_DLL_remove (h->control_head, h->control_tail, th);
947 th->notify (th->notify_cls, 0, NULL);
950 LOG (GNUNET_ERROR_TYPE_DEBUG,
951 "Scheduling task to reconnect to transport service in %llu ms.\n",
952 h->reconnect_delay.rel_value);
954 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
955 if (h->reconnect_delay.rel_value == 0)
957 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
961 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
963 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS, h->reconnect_delay);
969 * Send REQUEST_CONNECT message to the service.
971 * @param cls the 'struct GNUNET_PeerIdentity'
972 * @param size number of bytes available in buf
973 * @param buf where to copy the message
974 * @return number of bytes copied to buf
977 send_try_connect (void *cls, size_t size, void *buf)
979 struct GNUNET_PeerIdentity *pid = cls;
980 struct TransportRequestConnectMessage msg;
987 LOG (GNUNET_ERROR_TYPE_DEBUG,
988 "Transmitting `%s' request with respect to `%4s'.\n", "REQUEST_CONNECT",
990 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
991 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
992 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
993 msg.reserved = htonl (0);
995 memcpy (buf, &msg, sizeof (msg));
997 return sizeof (struct TransportRequestConnectMessage);
1002 * Ask the transport service to establish a connection to
1005 * @param handle connection to transport service
1006 * @param target who we should try to connect to
1009 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1010 const struct GNUNET_PeerIdentity *target)
1012 struct GNUNET_PeerIdentity *pid;
1013 if (NULL == handle->client)
1015 /* FIXME: handle->client can be NULL when transport api is reconnecting */
1020 pid = GNUNET_malloc (sizeof (struct GNUNET_PeerIdentity));
1022 schedule_control_transmit (handle,
1023 sizeof (struct TransportRequestConnectMessage),
1024 &send_try_connect, pid);
1028 struct SendHelloContext
1030 GNUNET_SCHEDULER_Task cont;
1034 struct GNUNET_MessageHeader *msg;
1038 * Send HELLO message to the service.
1040 * @param cls the HELLO message to send
1041 * @param size number of bytes available in buf
1042 * @param buf where to copy the message
1043 * @return number of bytes copied to buf
1046 send_hello (void *cls, size_t size, void *buf)
1048 struct SendHelloContext *shc = cls;
1049 struct GNUNET_MessageHeader *msg = shc->msg;
1051 struct GNUNET_SCHEDULER_TaskContext tc;
1052 tc.read_ready = NULL;
1053 tc.write_ready = NULL;
1054 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1058 LOG (GNUNET_ERROR_TYPE_DEBUG,
1059 "Timeout while trying to transmit `%s' request.\n", "HELLO");
1060 if (NULL != shc->cont)
1061 shc->cont (shc->cls, &tc);
1066 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transmitting `%s' request.\n", "HELLO");
1067 ssize = ntohs (msg->size);
1068 GNUNET_assert (size >= ssize);
1069 memcpy (buf, msg, ssize);
1071 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1072 if (NULL != shc->cont)
1073 shc->cont (shc->cls, &tc);
1080 * Offer the transport service the HELLO of another peer. Note that
1081 * the transport service may just ignore this message if the HELLO is
1082 * malformed or useless due to our local configuration.
1084 * @param handle connection to transport service
1085 * @param hello the hello message
1086 * @param cont continuation to call when HELLO has been sent,
1087 * tc reason GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1088 * tc reasong GNUNET_SCHEDULER_REASON_READY for success
1089 * @param cls closure for continuation
1093 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1094 const struct GNUNET_MessageHeader *hello,
1095 GNUNET_SCHEDULER_Task cont, void *cls)
1098 struct GNUNET_PeerIdentity peer;
1099 struct GNUNET_MessageHeader *msg;
1100 struct SendHelloContext * shc;
1101 struct GNUNET_SCHEDULER_TaskContext tc;
1103 tc.read_ready = NULL;
1104 tc.write_ready = NULL;
1105 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1107 if (NULL == handle->client)
1113 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1114 size = ntohs (hello->size);
1115 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1117 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello, &peer))
1125 msg = GNUNET_malloc (size);
1126 memcpy (msg, hello, size);
1127 LOG (GNUNET_ERROR_TYPE_DEBUG,
1128 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1129 GNUNET_i2s (&peer));
1130 shc = GNUNET_malloc (sizeof (struct SendHelloContext));
1134 schedule_control_transmit (handle, size, &send_hello, shc);
1139 * Obtain the HELLO message for this peer.
1141 * @param handle connection to transport service
1142 * @param rec function to call with the HELLO, sender will be our peer
1143 * identity; message and sender will be NULL on timeout
1144 * (handshake with transport service pending/failed).
1145 * cost estimate will be 0.
1146 * @param rec_cls closure for rec
1147 * @return handle to cancel the operation
1149 struct GNUNET_TRANSPORT_GetHelloHandle *
1150 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1151 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1154 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1156 hwl = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_GetHelloHandle));
1158 hwl->rec_cls = rec_cls;
1159 hwl->handle = handle;
1160 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1161 if (handle->my_hello != NULL)
1162 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
1168 * Stop receiving updates about changes to our HELLO message.
1170 * @param ghh handle to cancel
1173 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1175 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1177 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1183 * Connect to the transport service. Note that the connection may
1184 * complete (or fail) asynchronously.
1186 * @param cfg configuration to use
1187 * @param self our own identity (API should check that it matches
1188 * the identity found by transport), or NULL (no check)
1189 * @param cls closure for the callbacks
1190 * @param rec receive function to call
1191 * @param nc function to call on connect events
1192 * @param nd function to call on disconnect events
1194 struct GNUNET_TRANSPORT_Handle *
1195 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1196 const struct GNUNET_PeerIdentity *self, void *cls,
1197 GNUNET_TRANSPORT_ReceiveCallback rec,
1198 GNUNET_TRANSPORT_NotifyConnect nc,
1199 GNUNET_TRANSPORT_NotifyDisconnect nd)
1201 struct GNUNET_TRANSPORT_Handle *ret;
1203 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1207 ret->check_self = GNUNET_YES;
1214 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1216 GNUNET_CONTAINER_multihashmap_create (STARTING_NEIGHBOURS_SIZE, GNUNET_YES);
1218 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1219 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
1220 ret->client = GNUNET_CLIENT_connect ("transport", cfg);
1221 if (ret->client == NULL)
1226 schedule_control_transmit (ret, sizeof (struct StartMessage), &send_start, ret);
1232 * Disconnect from the transport service.
1234 * @param handle handle to the service as returned from GNUNET_TRANSPORT_connect
1237 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1239 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1240 /* this disconnects all neighbours... */
1241 if (handle->reconnect_task == GNUNET_SCHEDULER_NO_TASK)
1242 disconnect_and_schedule_reconnect (handle);
1243 /* and now we stop trying to connect again... */
1244 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1246 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1247 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1249 GNUNET_CONTAINER_multihashmap_destroy (handle->neighbours);
1250 handle->neighbours = NULL;
1251 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1253 GNUNET_SCHEDULER_cancel (handle->quota_task);
1254 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1256 GNUNET_free_non_null (handle->my_hello);
1257 handle->my_hello = NULL;
1258 GNUNET_assert (handle->hwl_head == NULL);
1259 GNUNET_assert (handle->hwl_tail == NULL);
1260 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1261 handle->ready_heap = NULL;
1262 GNUNET_free (handle);
1267 * Check if we could queue a message of the given size for
1268 * transmission. The transport service will take both its
1269 * internal buffers and bandwidth limits imposed by the
1270 * other peer into consideration when answering this query.
1272 * @param handle connection to transport service
1273 * @param target who should receive the message
1274 * @param size how big is the message we want to transmit?
1275 * @param priority how important is the message?
1276 * @param timeout after how long should we give up (and call
1277 * notify with buf NULL and size 0)?
1278 * @param notify function to call when we are ready to
1279 * send such a message
1280 * @param notify_cls closure for notify
1281 * @return NULL if someone else is already waiting to be notified
1282 * non-NULL if the notify callback was queued (can be used to cancel
1283 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1285 struct GNUNET_TRANSPORT_TransmitHandle *
1286 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1287 const struct GNUNET_PeerIdentity
1288 *target, size_t size, uint32_t priority,
1289 struct GNUNET_TIME_Relative timeout,
1290 GNUNET_CONNECTION_TransmitReadyNotify
1291 notify, void *notify_cls)
1293 struct Neighbour *n;
1294 struct GNUNET_TRANSPORT_TransmitHandle *th;
1295 struct GNUNET_TIME_Relative delay;
1297 n = neighbour_find (handle, target);
1300 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1301 * once a connection has been established */
1307 /* attempt to send two messages at the same time to the same peer */
1311 GNUNET_assert (NULL == n->hn);
1312 th = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_TransmitHandle));
1314 th->notify = notify;
1315 th->notify_cls = notify_cls;
1316 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1317 th->notify_size = size;
1318 th->priority = priority;
1320 /* calculate when our transmission should be ready */
1321 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker, size);
1322 if (delay.rel_value > timeout.rel_value)
1323 delay.rel_value = 0; /* notify immediately (with failure) */
1324 LOG (GNUNET_ERROR_TYPE_DEBUG,
1325 "Bandwidth tracker allows next transmission to peer %s in %llu ms\n",
1326 GNUNET_i2s (target), (unsigned long long) delay.rel_value);
1327 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap, n, delay.rel_value);
1328 schedule_transmission (handle);
1334 * Cancel the specified transmission-ready notification.
1336 * @param th handle returned from GNUNET_TRANSPORT_notify_transmit_ready
1339 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1340 GNUNET_TRANSPORT_TransmitHandle
1343 struct Neighbour *n;
1345 GNUNET_assert (NULL == th->next);
1346 GNUNET_assert (NULL == th->prev);
1348 GNUNET_assert (th == n->th);
1352 GNUNET_CONTAINER_heap_remove_node (n->hn);
1357 GNUNET_assert (GNUNET_SCHEDULER_NO_TASK != th->timeout_task);
1358 GNUNET_SCHEDULER_cancel (th->timeout_task);
1359 th->timeout_task = GNUNET_SCHEDULER_NO_TASK;
1365 /* end of transport_api.c */