2 This file is part of GNUnet.
3 Copyright (C) 2009-2013 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
8 option) any later version.
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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.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 Boston, MA 02110-1301, USA.
22 * @file transport/transport_api.c
23 * @brief library to access the low-level P2P IO service
24 * @author Christian Grothoff
30 #include "gnunet_util_lib.h"
31 #include "gnunet_constants.h"
32 #include "gnunet_arm_service.h"
33 #include "gnunet_hello_lib.h"
34 #include "gnunet_protocols.h"
35 #include "gnunet_transport_service.h"
36 #include "transport.h"
38 #define LOG(kind,...) GNUNET_log_from (kind, "transport-api",__VA_ARGS__)
41 * How large to start with for the hashmap of neighbours.
43 #define STARTING_NEIGHBOURS_SIZE 16
46 * Handle for a message that should be transmitted to the service.
47 * Used for both control messages and normal messages.
49 struct GNUNET_TRANSPORT_TransmitHandle
53 * We keep all requests in a DLL.
55 struct GNUNET_TRANSPORT_TransmitHandle *next;
58 * We keep all requests in a DLL.
60 struct GNUNET_TRANSPORT_TransmitHandle *prev;
63 * Neighbour for this handle, NULL for control messages.
65 struct Neighbour *neighbour;
68 * Function to call when @e notify_size bytes are available
71 GNUNET_TRANSPORT_TransmitReadyNotify notify;
74 * Closure for @e notify.
79 * Timeout for this request, 0 for control messages.
81 struct GNUNET_TIME_Absolute timeout;
84 * Task to trigger request timeout if the request is stalled due to
87 struct GNUNET_SCHEDULER_Task * timeout_task;
90 * How many bytes is our notify callback waiting for?
98 * Entry in hash table of all of our current (connected) neighbours.
103 * Overall transport handle.
105 struct GNUNET_TRANSPORT_Handle *h;
108 * Active transmit handle or NULL.
110 struct GNUNET_TRANSPORT_TransmitHandle *th;
113 * Identity of this neighbour.
115 struct GNUNET_PeerIdentity id;
118 * Outbound bandwidh tracker.
120 struct GNUNET_BANDWIDTH_Tracker out_tracker;
123 * Entry in our readyness heap (which is sorted by @e next_ready
124 * value). NULL if there is no pending transmission request for
125 * this neighbour or if we're waiting for @e is_ready to become
126 * true AFTER the @e out_tracker suggested that this peer's quota
127 * has been satisfied (so once @e is_ready goes to #GNUNET_YES,
128 * we should immediately go back into the heap).
130 struct GNUNET_CONTAINER_HeapNode *hn;
133 * Is this peer currently ready to receive a message?
138 * Sending consumed more bytes on wire than payload was announced
139 * This overhead is added to the delay of next sending operation
141 size_t traffic_overhead;
146 * Linked list of functions to call whenever our HELLO is updated.
148 struct GNUNET_TRANSPORT_GetHelloHandle
152 * This is a doubly linked list.
154 struct GNUNET_TRANSPORT_GetHelloHandle *next;
157 * This is a doubly linked list.
159 struct GNUNET_TRANSPORT_GetHelloHandle *prev;
164 struct GNUNET_TRANSPORT_Handle *handle;
167 * Callback to call once we got our HELLO.
169 GNUNET_TRANSPORT_HelloUpdateCallback rec;
172 * Task for calling the HelloUpdateCallback when we already have a HELLO
174 struct GNUNET_SCHEDULER_Task * notify_task;
177 * Closure for @e rec.
185 * Entry in linked list for a try-connect request.
187 struct GNUNET_TRANSPORT_TryConnectHandle
192 struct GNUNET_TRANSPORT_TryConnectHandle *prev;
197 struct GNUNET_TRANSPORT_TryConnectHandle *next;
200 * Peer we should try to connect to.
202 struct GNUNET_PeerIdentity pid;
205 * Transport service handle this request is part of.
207 struct GNUNET_TRANSPORT_Handle *th;
210 * Message transmission request to communicate to service.
212 struct GNUNET_TRANSPORT_TransmitHandle *tth;
215 * Function to call upon completion (of request transmission).
217 GNUNET_TRANSPORT_TryConnectCallback cb;
228 * Entry in linked list for all try-disconnect requests
230 struct GNUNET_TRANSPORT_TryDisconnectHandle
235 struct GNUNET_TRANSPORT_TryDisconnectHandle *prev;
240 struct GNUNET_TRANSPORT_TryDisconnectHandle *next;
243 * Peer we should try to connect to.
245 struct GNUNET_PeerIdentity pid;
248 * Transport service handle this request is part of.
250 struct GNUNET_TRANSPORT_Handle *th;
253 * Message transmission request to communicate to service.
255 struct GNUNET_TRANSPORT_TransmitHandle *tth;
258 * Function to call upon completion (of request transmission).
260 GNUNET_TRANSPORT_TryDisconnectCallback cb;
271 * Entry in linked list for all offer-HELLO requests.
273 struct GNUNET_TRANSPORT_OfferHelloHandle
278 struct GNUNET_TRANSPORT_OfferHelloHandle *prev;
283 struct GNUNET_TRANSPORT_OfferHelloHandle *next;
286 * Transport service handle we use for transmission.
288 struct GNUNET_TRANSPORT_Handle *th;
291 * Transmission handle for this request.
293 struct GNUNET_TRANSPORT_TransmitHandle *tth;
296 * Function to call once we are done.
298 GNUNET_SCHEDULER_TaskCallback cont;
301 * Closure for @e cont
306 * The HELLO message to be transmitted.
308 struct GNUNET_MessageHeader *msg;
313 * Handle for the transport service (includes all of the
314 * state for the transport service).
316 struct GNUNET_TRANSPORT_Handle
320 * Closure for the callbacks.
325 * Function to call for received data.
327 GNUNET_TRANSPORT_ReceiveCallback rec;
330 * function to call on connect events
332 GNUNET_TRANSPORT_NotifyConnect nc_cb;
335 * function to call on disconnect events
337 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
340 * function to call on excess bandwidth events
342 GNUNET_TRANSPORT_NotifyExcessBandwidth neb_cb;
345 * Head of DLL of control messages.
347 struct GNUNET_TRANSPORT_TransmitHandle *control_head;
350 * Tail of DLL of control messages.
352 struct GNUNET_TRANSPORT_TransmitHandle *control_tail;
355 * The current HELLO message for this peer. Updated
356 * whenever transports change their addresses.
358 struct GNUNET_MessageHeader *my_hello;
361 * My client connection to the transport service.
363 struct GNUNET_CLIENT_Connection *client;
366 * Handle to our registration with the client for notification.
368 struct GNUNET_CLIENT_TransmitHandle *cth;
371 * Linked list of pending requests for our HELLO.
373 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_head;
376 * Linked list of pending requests for our HELLO.
378 struct GNUNET_TRANSPORT_GetHelloHandle *hwl_tail;
381 * Linked list of pending try connect requests head
383 struct GNUNET_TRANSPORT_TryConnectHandle *tc_head;
386 * Linked list of pending try connect requests tail
388 struct GNUNET_TRANSPORT_TryConnectHandle *tc_tail;
391 * Linked list of pending try disconnect requests head
393 struct GNUNET_TRANSPORT_TryDisconnectHandle *td_head;
396 * Linked list of pending try connect requests tail
398 struct GNUNET_TRANSPORT_TryDisconnectHandle *td_tail;
401 * Linked list of pending offer HELLO requests head
403 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_head;
406 * Linked list of pending offer HELLO requests tail
408 struct GNUNET_TRANSPORT_OfferHelloHandle *oh_tail;
413 const struct GNUNET_CONFIGURATION_Handle *cfg;
416 * Hash map of the current connected neighbours of this peer.
417 * Maps peer identities to `struct Neighbour` entries.
419 struct GNUNET_CONTAINER_MultiPeerMap *neighbours;
422 * Heap sorting peers with pending messages by the timestamps that
423 * specify when we could next send a message to the respective peer.
424 * Excludes control messages (which can always go out immediately).
425 * Maps time stamps to 'struct Neighbour' entries.
427 struct GNUNET_CONTAINER_Heap *ready_heap;
430 * Peer identity as assumed by this process, or all zeros.
432 struct GNUNET_PeerIdentity self;
435 * ID of the task trying to reconnect to the service.
437 struct GNUNET_SCHEDULER_Task * reconnect_task;
440 * ID of the task trying to trigger transmission for a peer while
441 * maintaining bandwidth quotas. In use if there are no control
442 * messages and the smallest entry in the 'ready_heap' has a time
443 * stamp in the future.
445 struct GNUNET_SCHEDULER_Task * quota_task;
448 * Delay until we try to reconnect.
450 struct GNUNET_TIME_Relative reconnect_delay;
453 * Should we check that @e self matches what the service thinks?
454 * (if #GNUNET_NO, then @e self is all zeros!).
459 * Reconnect in progress
466 * Schedule the task to send one message, either from the control
467 * list or the peer message queues to the service.
469 * @param h transport service to schedule a transmission for
472 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
476 * Function that will schedule the job that will try
477 * to connect us again to the client.
479 * @param h transport service to reconnect
482 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h);
486 * Get the neighbour list entry for the given peer
488 * @param h our context
489 * @param peer peer to look up
490 * @return NULL if no such peer entry exists
492 static struct Neighbour *
493 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
494 const struct GNUNET_PeerIdentity *peer)
496 return GNUNET_CONTAINER_multipeermap_get (h->neighbours,
502 * The outbound quota has changed in a way that may require
503 * us to reset the timeout. Update the timeout.
505 * @param cls the `struct Neighbour` for which the timeout changed
508 outbound_bw_tracker_update (void *cls)
510 struct Neighbour *n = cls;
511 struct GNUNET_TIME_Relative delay;
515 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
516 n->th->notify_size + n->traffic_overhead);
517 LOG (GNUNET_ERROR_TYPE_DEBUG,
518 "New outbound delay %llu us\n",
519 GNUNET_STRINGS_relative_time_to_string (delay,
521 GNUNET_CONTAINER_heap_update_cost (n->h->ready_heap,
522 n->hn, delay.rel_value_us);
523 schedule_transmission (n->h);
528 * Function called by the bandwidth tracker if we have excess
531 * @param cls the `struct Neighbour` that has excess bandwidth
534 notify_excess_cb (void *cls)
536 struct Neighbour *n = cls;
537 struct GNUNET_TRANSPORT_Handle *h = n->h;
539 if (NULL != h->neb_cb)
546 * Add neighbour to our list
548 * @return NULL if this API is currently disconnecting from the service
550 static struct Neighbour *
551 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
552 const struct GNUNET_PeerIdentity *pid)
556 LOG (GNUNET_ERROR_TYPE_DEBUG,
557 "Creating entry for neighbour `%4s'.\n",
559 n = GNUNET_new (struct Neighbour);
562 n->is_ready = GNUNET_YES;
563 n->traffic_overhead = 0;
564 GNUNET_BANDWIDTH_tracker_init2 (&n->out_tracker,
565 &outbound_bw_tracker_update,
567 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
568 MAX_BANDWIDTH_CARRY_S,
571 GNUNET_assert (GNUNET_OK ==
572 GNUNET_CONTAINER_multipeermap_put (h->neighbours,
575 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
581 * Iterator over hash map entries, for deleting state of a neighbour.
583 * @param cls the `struct GNUNET_TRANSPORT_Handle *`
584 * @param key peer identity
585 * @param value value in the hash map, the neighbour entry to delete
586 * @return #GNUNET_YES if we should continue to
591 neighbour_delete (void *cls,
592 const struct GNUNET_PeerIdentity *key,
595 struct GNUNET_TRANSPORT_Handle *handle = cls;
596 struct Neighbour *n = value;
598 GNUNET_BANDWIDTH_tracker_notification_stop (&n->out_tracker);
599 if (NULL != handle->nd_cb)
600 handle->nd_cb (handle->cls,
602 GNUNET_assert (NULL == n->th);
603 GNUNET_assert (NULL == n->hn);
604 GNUNET_assert (GNUNET_YES ==
605 GNUNET_CONTAINER_multipeermap_remove (handle->neighbours,
614 * Function we use for handling incoming messages.
616 * @param cls closure, a `struct GNUNET_TRANSPORT_Handle *`
617 * @param msg message received, NULL on timeout or fatal error
620 demultiplexer (void *cls,
621 const struct GNUNET_MessageHeader *msg)
623 struct GNUNET_TRANSPORT_Handle *h = cls;
624 const struct DisconnectInfoMessage *dim;
625 const struct ConnectInfoMessage *cim;
626 const struct InboundMessage *im;
627 const struct GNUNET_MessageHeader *imm;
628 const struct SendOkMessage *okm;
629 const struct QuotaSetMessage *qm;
630 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
631 struct GNUNET_TRANSPORT_GetHelloHandle *next_hwl;
633 struct GNUNET_PeerIdentity me;
636 uint32_t bytes_physical;
638 GNUNET_assert (NULL != h->client);
639 if (GNUNET_YES == h->reconnecting)
645 LOG (GNUNET_ERROR_TYPE_DEBUG,
646 "Error receiving from transport service, disconnecting temporarily.\n");
647 h->reconnecting = GNUNET_YES;
648 disconnect_and_schedule_reconnect (h);
651 GNUNET_CLIENT_receive (h->client,
654 GNUNET_TIME_UNIT_FOREVER_REL);
655 size = ntohs (msg->size);
656 switch (ntohs (msg->type))
658 case GNUNET_MESSAGE_TYPE_HELLO:
660 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
666 LOG (GNUNET_ERROR_TYPE_DEBUG,
667 "Receiving (my own) HELLO message (%u bytes), I am `%4s'.\n",
670 GNUNET_free_non_null (h->my_hello);
672 if (size < sizeof (struct GNUNET_MessageHeader))
677 h->my_hello = GNUNET_copy_message (msg);
681 next_hwl = hwl->next;
682 hwl->rec (hwl->rec_cls,
687 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
688 if (size < sizeof (struct ConnectInfoMessage))
693 cim = (const struct ConnectInfoMessage *) msg;
695 sizeof (struct ConnectInfoMessage))
700 LOG (GNUNET_ERROR_TYPE_DEBUG,
701 "Receiving CONNECT message for `%4s'.\n",
702 GNUNET_i2s (&cim->id));
703 n = neighbour_find (h, &cim->id);
709 n = neighbour_add (h,
711 LOG (GNUNET_ERROR_TYPE_DEBUG,
712 "Receiving CONNECT message for `%4s' with quota %u\n",
713 GNUNET_i2s (&cim->id),
714 ntohl (cim->quota_out.value__));
715 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
717 if (NULL != h->nc_cb)
721 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
722 if (size != sizeof (struct DisconnectInfoMessage))
727 dim = (const struct DisconnectInfoMessage *) msg;
728 GNUNET_break (ntohl (dim->reserved) == 0);
729 LOG (GNUNET_ERROR_TYPE_DEBUG,
730 "Receiving DISCONNECT message for `%4s'.\n",
731 GNUNET_i2s (&dim->peer));
732 n = neighbour_find (h, &dim->peer);
742 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
743 if (size != sizeof (struct SendOkMessage))
748 okm = (const struct SendOkMessage *) msg;
749 bytes_msg = ntohl (okm->bytes_msg);
750 bytes_physical = ntohl (okm->bytes_physical);
751 LOG (GNUNET_ERROR_TYPE_DEBUG,
752 "Receiving SEND_OK message, transmission %s.\n",
753 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
755 n = neighbour_find (h, &okm->peer);
759 if (bytes_physical >= bytes_msg)
761 LOG (GNUNET_ERROR_TYPE_DEBUG,
762 "Overhead for %u byte message: %u\n",
764 bytes_physical - bytes_msg);
765 n->traffic_overhead += bytes_physical - bytes_msg;
767 GNUNET_break (GNUNET_NO == n->is_ready);
768 n->is_ready = GNUNET_YES;
769 if ((NULL != n->th) && (NULL == n->hn))
771 GNUNET_assert (NULL != n->th->timeout_task);
772 GNUNET_SCHEDULER_cancel (n->th->timeout_task);
773 n->th->timeout_task = NULL;
774 /* we've been waiting for this (congestion, not quota,
775 * caused delayed transmission) */
776 n->hn = GNUNET_CONTAINER_heap_insert (h->ready_heap, n, 0);
777 schedule_transmission (h);
780 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
782 sizeof (struct InboundMessage) + sizeof (struct GNUNET_MessageHeader))
787 im = (const struct InboundMessage *) msg;
788 imm = (const struct GNUNET_MessageHeader *) &im[1];
789 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
794 LOG (GNUNET_ERROR_TYPE_DEBUG,
795 "Received message of type %u from `%4s'.\n",
796 ntohs (imm->type), GNUNET_i2s (&im->peer));
797 n = neighbour_find (h, &im->peer);
808 case GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA:
809 if (size != sizeof (struct QuotaSetMessage))
814 qm = (const struct QuotaSetMessage *) msg;
815 n = neighbour_find (h, &qm->peer);
818 LOG (GNUNET_ERROR_TYPE_DEBUG,
819 "Receiving SET_QUOTA message for `%4s' with quota %u\n",
820 GNUNET_i2s (&qm->peer),
821 ntohl (qm->quota.value__));
822 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
826 LOG (GNUNET_ERROR_TYPE_ERROR,
827 _("Received unexpected message of type %u in %s:%u\n"),
838 * A transmission request could not be satisfied because of
839 * network congestion. Notify the initiator and clean up.
841 * @param cls the `struct GNUNET_TRANSPORT_TransmitHandle`
842 * @param tc scheduler context
845 timeout_request_due_to_congestion (void *cls,
846 const struct GNUNET_SCHEDULER_TaskContext *tc)
848 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
849 struct Neighbour *n = th->neighbour;
851 n->th->timeout_task = NULL;
852 GNUNET_assert (th == n->th);
853 GNUNET_assert (NULL == n->hn);
855 th->notify (th->notify_cls,
863 * Transmit message(s) to service.
865 * @param cls handle to transport
866 * @param size number of bytes available in @a buf
867 * @param buf where to copy the message
868 * @return number of bytes copied to @a buf
871 transport_notify_ready (void *cls,
875 struct GNUNET_TRANSPORT_Handle *h = cls;
876 struct GNUNET_TRANSPORT_TransmitHandle *th;
879 struct OutboundMessage obm;
884 GNUNET_assert (NULL != h->client);
888 /* transmission failed */
889 disconnect_and_schedule_reconnect (h);
895 /* first send control messages */
896 while ( (NULL != (th = h->control_head)) &&
897 (th->notify_size <= size) )
899 GNUNET_CONTAINER_DLL_remove (h->control_head,
902 nret = th->notify (th->notify_cls, size, &cbuf[ret]);
903 LOG (GNUNET_ERROR_TYPE_DEBUG,
904 "Added %u bytes of control message at %u\n",
912 /* then, if possible and no control messages pending, send data messages */
913 while ((NULL == h->control_head) &&
914 (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))))
916 if (GNUNET_YES != n->is_ready)
918 /* peer not ready, wait for notification! */
919 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
921 GNUNET_assert (NULL == n->th->timeout_task);
922 n->th->timeout_task =
923 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
925 &timeout_request_due_to_congestion,
930 if (th->notify_size + sizeof (struct OutboundMessage) > size)
931 break; /* does not fit */
932 if (GNUNET_BANDWIDTH_tracker_get_delay
933 (&n->out_tracker, th->notify_size).rel_value_us > 0)
934 break; /* too early */
935 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
938 n->is_ready = GNUNET_NO;
939 GNUNET_assert (size >= sizeof (struct OutboundMessage));
941 th->notify (th->notify_cls, size - sizeof (struct OutboundMessage),
942 &cbuf[ret + sizeof (struct OutboundMessage)]);
943 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
946 GNUNET_assert (mret + sizeof (struct OutboundMessage) <
947 GNUNET_SERVER_MAX_MESSAGE_SIZE);
948 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
949 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
950 obm.reserved = htonl (0);
952 GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining
955 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
956 ret += (mret + sizeof (struct OutboundMessage));
957 size -= (mret + sizeof (struct OutboundMessage));
958 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
962 /* if there are more pending messages, try to schedule those */
963 schedule_transmission (h);
964 LOG (GNUNET_ERROR_TYPE_DEBUG,
965 "Transmitting %u bytes to transport service\n",
972 * Schedule the task to send one message, either from the control
973 * list or the peer message queues to the service.
975 * @param cls transport service to schedule a transmission for
976 * @param tc scheduler context
979 schedule_transmission_task (void *cls,
980 const struct GNUNET_SCHEDULER_TaskContext *tc)
982 struct GNUNET_TRANSPORT_Handle *h = cls;
984 struct GNUNET_TRANSPORT_TransmitHandle *th;
987 h->quota_task = NULL;
988 GNUNET_assert (NULL != h->client);
989 /* destroy all requests that have timed out */
990 while ((NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap))) &&
991 (0 == GNUNET_TIME_absolute_get_remaining (n->th->timeout).rel_value_us))
993 /* notify client that the request could not be satisfied within
994 * the given time constraints */
997 GNUNET_assert (n == GNUNET_CONTAINER_heap_remove_root (h->ready_heap));
999 LOG (GNUNET_ERROR_TYPE_DEBUG,
1000 "Signalling timeout for transmission to peer %s due to congestion\n",
1001 GNUNET_i2s (&n->id));
1002 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
1007 if (NULL != h->control_head)
1009 size = h->control_head->notify_size;
1013 n = GNUNET_CONTAINER_heap_peek (h->ready_heap);
1015 return; /* no pending messages */
1016 size = n->th->notify_size + sizeof (struct OutboundMessage);
1018 LOG (GNUNET_ERROR_TYPE_DEBUG,
1019 "Calling notify_transmit_ready\n");
1021 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
1022 GNUNET_TIME_UNIT_FOREVER_REL,
1023 GNUNET_NO, &transport_notify_ready,
1025 GNUNET_assert (NULL != h->cth);
1030 * Schedule the task to send one message, either from the control
1031 * list or the peer message queues to the service.
1033 * @param h transport service to schedule a transmission for
1036 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
1038 struct GNUNET_TIME_Relative delay;
1039 struct Neighbour *n;
1041 GNUNET_assert (NULL != h->client);
1042 if (h->quota_task != NULL)
1044 GNUNET_SCHEDULER_cancel (h->quota_task);
1045 h->quota_task = NULL;
1047 if (NULL != h->control_head)
1048 delay = GNUNET_TIME_UNIT_ZERO;
1049 else if (NULL != (n = GNUNET_CONTAINER_heap_peek (h->ready_heap)))
1052 GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
1053 n->th->notify_size + n->traffic_overhead);
1054 n->traffic_overhead = 0;
1057 return; /* no work to be done */
1058 LOG (GNUNET_ERROR_TYPE_DEBUG,
1059 "Scheduling next transmission to service in %s\n",
1060 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
1062 GNUNET_SCHEDULER_add_delayed (delay, &schedule_transmission_task, h);
1067 * Queue control request for transmission to the transport
1070 * @param h handle to the transport service
1071 * @param size number of bytes to be transmitted
1072 * @param notify function to call to get the content
1073 * @param notify_cls closure for @a notify
1074 * @return a `struct GNUNET_TRANSPORT_TransmitHandle`
1076 static struct GNUNET_TRANSPORT_TransmitHandle *
1077 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
1079 GNUNET_TRANSPORT_TransmitReadyNotify notify,
1082 struct GNUNET_TRANSPORT_TransmitHandle *th;
1084 LOG (GNUNET_ERROR_TYPE_DEBUG,
1085 "Control transmit of %u bytes requested\n",
1087 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
1088 th->notify = notify;
1089 th->notify_cls = notify_cls;
1090 th->notify_size = size;
1091 GNUNET_CONTAINER_DLL_insert_tail (h->control_head, h->control_tail, th);
1092 schedule_transmission (h);
1098 * Transmit START message to service.
1101 * @param size number of bytes available in @a buf
1102 * @param buf where to copy the message
1103 * @return number of bytes copied to @a buf
1106 send_start (void *cls, size_t size, void *buf)
1108 struct GNUNET_TRANSPORT_Handle *h = cls;
1109 struct StartMessage s;
1114 /* Can only be shutdown, just give up */
1115 LOG (GNUNET_ERROR_TYPE_DEBUG,
1116 "Shutdown while trying to transmit START request.\n");
1119 LOG (GNUNET_ERROR_TYPE_DEBUG,
1120 "Transmitting START request.\n");
1121 GNUNET_assert (size >= sizeof (struct StartMessage));
1122 s.header.size = htons (sizeof (struct StartMessage));
1123 s.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
1129 s.options = htonl (options);
1131 memcpy (buf, &s, sizeof (struct StartMessage));
1132 GNUNET_CLIENT_receive (h->client, &demultiplexer, h,
1133 GNUNET_TIME_UNIT_FOREVER_REL);
1134 return sizeof (struct StartMessage);
1139 * Try again to connect to transport service.
1141 * @param cls the handle to the transport service
1142 * @param tc scheduler context
1145 reconnect (void *cls,
1146 const struct GNUNET_SCHEDULER_TaskContext *tc)
1148 struct GNUNET_TRANSPORT_Handle *h = cls;
1150 h->reconnect_task = NULL;
1151 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1153 /* shutdown, just give up */
1156 LOG (GNUNET_ERROR_TYPE_DEBUG,
1157 "Connecting to transport service.\n");
1158 GNUNET_assert (NULL == h->client);
1159 GNUNET_assert (NULL == h->control_head);
1160 GNUNET_assert (NULL == h->control_tail);
1161 h->reconnecting = GNUNET_NO;
1162 h->client = GNUNET_CLIENT_connect ("transport", h->cfg);
1164 GNUNET_assert (NULL != h->client);
1165 schedule_control_transmit (h, sizeof (struct StartMessage),
1171 * Function that will schedule the job that will try
1172 * to connect us again to the client.
1174 * @param h transport service to reconnect
1177 disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
1179 struct GNUNET_TRANSPORT_TransmitHandle *th;
1181 GNUNET_assert (h->reconnect_task == NULL);
1184 GNUNET_CLIENT_notify_transmit_ready_cancel (h->cth);
1187 if (NULL != h->client)
1189 GNUNET_CLIENT_disconnect (h->client);
1191 /* LOG (GNUNET_ERROR_TYPE_ERROR,
1192 "Client disconnect done \n");*/
1194 /* Forget about all neighbours that we used to be connected to */
1195 GNUNET_CONTAINER_multipeermap_iterate (h->neighbours,
1198 if (NULL != h->quota_task)
1200 GNUNET_SCHEDULER_cancel (h->quota_task);
1201 h->quota_task = NULL;
1203 while ((NULL != (th = h->control_head)))
1205 GNUNET_CONTAINER_DLL_remove (h->control_head,
1208 th->notify (th->notify_cls,
1213 LOG (GNUNET_ERROR_TYPE_DEBUG,
1214 "Scheduling task to reconnect to transport service in %s.\n",
1215 GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay,
1218 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay,
1221 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
1226 * Cancel control request for transmission to the transport service.
1228 * @param th handle to the transport service
1229 * @param tth transmit handle to cancel
1232 cancel_control_transmit (struct GNUNET_TRANSPORT_Handle *th,
1233 struct GNUNET_TRANSPORT_TransmitHandle *tth)
1235 LOG (GNUNET_ERROR_TYPE_DEBUG,
1236 "Canceling transmit of contral transmission requested\n");
1237 GNUNET_CONTAINER_DLL_remove (th->control_head,
1245 * Send #GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT message to the
1248 * @param cls the `struct GNUNET_TRANSPORT_TryConnectHandle`
1249 * @param size number of bytes available in @a buf
1250 * @param buf where to copy the message
1251 * @return number of bytes copied to @a buf
1254 send_try_connect (void *cls,
1258 struct GNUNET_TRANSPORT_TryConnectHandle *tch = cls;
1259 struct TransportRequestConnectMessage msg;
1264 LOG (GNUNET_ERROR_TYPE_DEBUG,
1265 "Discarding `%s' request to `%4s' due to error in transport service connection.\n",
1267 GNUNET_i2s (&tch->pid));
1268 if (NULL != tch->cb)
1269 tch->cb (tch->cb_cls,
1271 GNUNET_TRANSPORT_try_connect_cancel (tch);
1274 LOG (GNUNET_ERROR_TYPE_DEBUG,
1275 "Transmitting `%s' request with respect to `%4s'.\n",
1277 GNUNET_i2s (&tch->pid));
1278 GNUNET_assert (size >= sizeof (struct TransportRequestConnectMessage));
1279 msg.header.size = htons (sizeof (struct TransportRequestConnectMessage));
1280 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_CONNECT);
1281 msg.reserved = htonl (0);
1282 msg.peer = tch->pid;
1283 memcpy (buf, &msg, sizeof (msg));
1284 if (NULL != tch->cb)
1285 tch->cb (tch->cb_cls, GNUNET_OK);
1286 GNUNET_TRANSPORT_try_connect_cancel (tch);
1287 return sizeof (struct TransportRequestConnectMessage);
1292 * Ask the transport service to establish a connection to
1295 * @param handle connection to transport service
1296 * @param target who we should try to connect to
1297 * @param cb callback to be called when request was transmitted to transport
1299 * @param cb_cls closure for the callback
1300 * @return a `struct GNUNET_TRANSPORT_TryConnectHandle` handle or
1301 * NULL on failure (cb will not be called)
1303 struct GNUNET_TRANSPORT_TryConnectHandle *
1304 GNUNET_TRANSPORT_try_connect (struct GNUNET_TRANSPORT_Handle *handle,
1305 const struct GNUNET_PeerIdentity *target,
1306 GNUNET_TRANSPORT_TryConnectCallback cb,
1309 struct GNUNET_TRANSPORT_TryConnectHandle *tch;
1311 if (NULL == handle->client)
1313 tch = GNUNET_new (struct GNUNET_TRANSPORT_TryConnectHandle);
1317 tch->cb_cls = cb_cls;
1318 tch->tth = schedule_control_transmit (handle,
1319 sizeof (struct TransportRequestConnectMessage),
1320 &send_try_connect, tch);
1321 GNUNET_CONTAINER_DLL_insert (handle->tc_head,
1329 * Cancel the request to transport to try a connect
1330 * Callback will not be called
1332 * @param tch the handle to cancel
1335 GNUNET_TRANSPORT_try_connect_cancel (struct GNUNET_TRANSPORT_TryConnectHandle *tch)
1337 struct GNUNET_TRANSPORT_Handle *th;
1340 if (NULL != tch->tth)
1341 cancel_control_transmit (th, tch->tth);
1342 GNUNET_CONTAINER_DLL_remove (th->tc_head,
1350 * Send #GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_DISCONNECT message to the
1353 * @param cls the `struct GNUNET_TRANSPORT_TryDisconnectHandle`
1354 * @param size number of bytes available in @a buf
1355 * @param buf where to copy the message
1356 * @return number of bytes copied to @a buf
1359 send_try_disconnect (void *cls,
1363 struct GNUNET_TRANSPORT_TryDisconnectHandle *tdh = cls;
1364 struct TransportRequestConnectMessage msg;
1369 LOG (GNUNET_ERROR_TYPE_DEBUG,
1370 "Discarding `%s' request to `%4s' due to error in transport service connection.\n",
1371 "REQUEST_DISCONNECT",
1372 GNUNET_i2s (&tdh->pid));
1373 if (NULL != tdh->cb)
1374 tdh->cb (tdh->cb_cls,
1376 GNUNET_TRANSPORT_try_disconnect_cancel (tdh);
1379 LOG (GNUNET_ERROR_TYPE_DEBUG,
1380 "Transmitting `%s' request with respect to `%4s'.\n",
1381 "REQUEST_DISCONNECT",
1382 GNUNET_i2s (&tdh->pid));
1383 GNUNET_assert (size >= sizeof (struct TransportRequestDisconnectMessage));
1384 msg.header.size = htons (sizeof (struct TransportRequestDisconnectMessage));
1385 msg.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_REQUEST_DISCONNECT);
1386 msg.reserved = htonl (0);
1387 msg.peer = tdh->pid;
1388 memcpy (buf, &msg, sizeof (msg));
1389 if (NULL != tdh->cb)
1390 tdh->cb (tdh->cb_cls, GNUNET_OK);
1391 GNUNET_TRANSPORT_try_disconnect_cancel (tdh);
1392 return sizeof (struct TransportRequestDisconnectMessage);
1397 * Ask the transport service to shutdown a connection to
1400 * @param handle connection to transport service
1401 * @param target who we should try to connect to
1402 * @param cb callback to be called when request was transmitted to transport
1404 * @param cb_cls closure for the callback @a cb
1405 * @return a `struct GNUNET_TRANSPORT_TryDisconnectHandle` handle or
1406 * NULL on failure (cb will not be called)
1408 struct GNUNET_TRANSPORT_TryDisconnectHandle *
1409 GNUNET_TRANSPORT_try_disconnect (struct GNUNET_TRANSPORT_Handle *handle,
1410 const struct GNUNET_PeerIdentity *target,
1411 GNUNET_TRANSPORT_TryDisconnectCallback cb,
1414 struct GNUNET_TRANSPORT_TryDisconnectHandle *tdh;
1416 if (NULL == handle->client)
1418 tdh = GNUNET_new (struct GNUNET_TRANSPORT_TryDisconnectHandle);
1422 tdh->cb_cls = cb_cls;
1423 tdh->tth = schedule_control_transmit (handle,
1424 sizeof (struct TransportRequestDisconnectMessage),
1425 &send_try_disconnect, tdh);
1426 GNUNET_CONTAINER_DLL_insert (handle->td_head,
1434 * Cancel the request to transport to try a disconnect
1435 * Callback will not be called
1437 * @param tdh the handle to cancel
1440 GNUNET_TRANSPORT_try_disconnect_cancel (struct GNUNET_TRANSPORT_TryDisconnectHandle *tdh)
1442 struct GNUNET_TRANSPORT_Handle *th;
1445 if (NULL != tdh->tth)
1446 cancel_control_transmit (th, tdh->tth);
1447 GNUNET_CONTAINER_DLL_remove (th->td_head,
1455 * Send HELLO message to the service.
1457 * @param cls the HELLO message to send
1458 * @param size number of bytes available in @a buf
1459 * @param buf where to copy the message
1460 * @return number of bytes copied to @a buf
1463 send_hello (void *cls,
1467 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh = cls;
1468 struct GNUNET_MessageHeader *msg = ohh->msg;
1470 struct GNUNET_SCHEDULER_TaskContext tc;
1472 tc.read_ready = NULL;
1473 tc.write_ready = NULL;
1474 tc.reason = GNUNET_SCHEDULER_REASON_TIMEOUT;
1477 LOG (GNUNET_ERROR_TYPE_DEBUG,
1478 "Timeout while trying to transmit `%s' request.\n",
1480 if (NULL != ohh->cont)
1481 ohh->cont (ohh->cls,
1484 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head,
1490 LOG (GNUNET_ERROR_TYPE_DEBUG,
1491 "Transmitting `%s' request.\n",
1493 ssize = ntohs (msg->size);
1494 GNUNET_assert (size >= ssize);
1499 tc.reason = GNUNET_SCHEDULER_REASON_READ_READY;
1500 if (NULL != ohh->cont)
1501 ohh->cont (ohh->cls,
1503 GNUNET_CONTAINER_DLL_remove (ohh->th->oh_head,
1512 * Send traffic metric message to the service.
1514 * @param cls the message to send
1515 * @param size number of bytes available in @a buf
1516 * @param buf where to copy the message
1517 * @return number of bytes copied to @a buf
1520 send_metric (void *cls,
1524 struct TrafficMetricMessage *msg = cls;
1529 LOG (GNUNET_ERROR_TYPE_DEBUG,
1530 "Timeout while trying to transmit TRAFFIC_METRIC request.\n");
1534 LOG (GNUNET_ERROR_TYPE_DEBUG,
1535 "Transmitting TRAFFIC_METRIC request.\n");
1536 ssize = ntohs (msg->header.size);
1537 GNUNET_assert (size >= ssize);
1538 memcpy (buf, msg, ssize);
1545 * Set transport metrics for a peer and a direction
1547 * @param handle transport handle
1548 * @param peer the peer to set the metric for
1549 * @param prop the performance metrics to set
1550 * @param delay_in inbound delay to introduce
1551 * @param delay_out outbound delay to introduce
1553 * Note: Delay restrictions in receiving direction will be enforced
1554 * with one message delay.
1557 GNUNET_TRANSPORT_set_traffic_metric (struct GNUNET_TRANSPORT_Handle *handle,
1558 const struct GNUNET_PeerIdentity *peer,
1559 const struct GNUNET_ATS_Properties *prop,
1560 struct GNUNET_TIME_Relative delay_in,
1561 struct GNUNET_TIME_Relative delay_out)
1563 struct TrafficMetricMessage *msg;
1565 msg = GNUNET_new (struct TrafficMetricMessage);
1566 msg->header.size = htons (sizeof (struct TrafficMetricMessage));
1567 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_TRAFFIC_METRIC);
1568 msg->reserved = htonl (0);
1570 GNUNET_ATS_properties_hton (&msg->properties,
1572 msg->delay_in = GNUNET_TIME_relative_hton (delay_in);
1573 msg->delay_out = GNUNET_TIME_relative_hton (delay_out);
1574 schedule_control_transmit (handle,
1575 sizeof (struct TrafficMetricMessage),
1582 * Offer the transport service the HELLO of another peer. Note that
1583 * the transport service may just ignore this message if the HELLO is
1584 * malformed or useless due to our local configuration.
1586 * @param handle connection to transport service
1587 * @param hello the hello message
1588 * @param cont continuation to call when HELLO has been sent,
1589 * tc reason #GNUNET_SCHEDULER_REASON_TIMEOUT for fail
1590 * tc reasong #GNUNET_SCHEDULER_REASON_READ_READY for success
1591 * @param cls closure for continuation
1592 * @return a `struct GNUNET_TRANSPORT_OfferHelloHandle` handle or NULL on failure,
1593 * in case of failure cont will not be called
1596 struct GNUNET_TRANSPORT_OfferHelloHandle *
1597 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1598 const struct GNUNET_MessageHeader *hello,
1599 GNUNET_SCHEDULER_TaskCallback cont,
1602 struct GNUNET_TRANSPORT_OfferHelloHandle *ohh;
1603 struct GNUNET_MessageHeader *msg;
1604 struct GNUNET_PeerIdentity peer;
1607 if (NULL == handle->client)
1609 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1610 size = ntohs (hello->size);
1611 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1613 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) hello,
1620 msg = GNUNET_malloc (size);
1621 memcpy (msg, hello, size);
1622 LOG (GNUNET_ERROR_TYPE_DEBUG,
1623 "Offering `%s' message of `%4s' to transport for validation.\n", "HELLO",
1624 GNUNET_i2s (&peer));
1626 ohh = GNUNET_new (struct GNUNET_TRANSPORT_OfferHelloHandle);
1631 ohh->tth = schedule_control_transmit (handle, size,
1633 GNUNET_CONTAINER_DLL_insert (handle->oh_head, handle->oh_tail, ohh);
1639 * Cancel the request to transport to offer the HELLO message
1641 * @param ohh the GNUNET_TRANSPORT_OfferHelloHandle to cancel
1644 GNUNET_TRANSPORT_offer_hello_cancel (struct GNUNET_TRANSPORT_OfferHelloHandle *ohh)
1646 struct GNUNET_TRANSPORT_Handle *th = ohh->th;
1648 cancel_control_transmit (ohh->th, ohh->tth);
1649 GNUNET_CONTAINER_DLL_remove (th->oh_head,
1652 GNUNET_free (ohh->msg);
1658 * Checks if a given peer is connected to us
1660 * @param handle connection to transport service
1661 * @param peer the peer to check
1662 * @return #GNUNET_YES (connected) or #GNUNET_NO (disconnected)
1665 GNUNET_TRANSPORT_check_peer_connected (struct GNUNET_TRANSPORT_Handle *handle,
1666 const struct GNUNET_PeerIdentity *peer)
1669 GNUNET_CONTAINER_multipeermap_contains (handle->neighbours,
1677 * Task to call the HelloUpdateCallback of the GetHelloHandle
1679 * @param cls the `struct GNUNET_TRANSPORT_GetHelloHandle`
1680 * @param tc the scheduler task context
1683 call_hello_update_cb_async (void *cls,
1684 const struct GNUNET_SCHEDULER_TaskContext *tc)
1686 struct GNUNET_TRANSPORT_GetHelloHandle *ghh = cls;
1688 GNUNET_assert (NULL != ghh->handle->my_hello);
1689 GNUNET_assert (NULL != ghh->notify_task);
1690 ghh->notify_task = NULL;
1691 ghh->rec (ghh->rec_cls,
1692 ghh->handle->my_hello);
1697 * Obtain the HELLO message for this peer. The callback given in this function
1698 * is never called synchronously.
1700 * @param handle connection to transport service
1701 * @param rec function to call with the HELLO, sender will be our peer
1702 * identity; message and sender will be NULL on timeout
1703 * (handshake with transport service pending/failed).
1704 * cost estimate will be 0.
1705 * @param rec_cls closure for @a rec
1706 * @return handle to cancel the operation
1708 struct GNUNET_TRANSPORT_GetHelloHandle *
1709 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
1710 GNUNET_TRANSPORT_HelloUpdateCallback rec,
1713 struct GNUNET_TRANSPORT_GetHelloHandle *hwl;
1715 hwl = GNUNET_new (struct GNUNET_TRANSPORT_GetHelloHandle);
1717 hwl->rec_cls = rec_cls;
1718 hwl->handle = handle;
1719 GNUNET_CONTAINER_DLL_insert (handle->hwl_head, handle->hwl_tail, hwl);
1720 if (NULL != handle->my_hello)
1721 hwl->notify_task = GNUNET_SCHEDULER_add_now (&call_hello_update_cb_async,
1728 * Stop receiving updates about changes to our HELLO message.
1730 * @param ghh handle to cancel
1733 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_GetHelloHandle *ghh)
1735 struct GNUNET_TRANSPORT_Handle *handle = ghh->handle;
1737 if (NULL != ghh->notify_task)
1738 GNUNET_SCHEDULER_cancel (ghh->notify_task);
1739 GNUNET_CONTAINER_DLL_remove (handle->hwl_head, handle->hwl_tail, ghh);
1745 * Connect to the transport service. Note that the connection may
1746 * complete (or fail) asynchronously.
1748 * @param cfg configuration to use
1749 * @param self our own identity (API should check that it matches
1750 * the identity found by transport), or NULL (no check)
1751 * @param cls closure for the callbacks
1752 * @param rec receive function to call
1753 * @param nc function to call on connect events
1754 * @param nd function to call on disconnect events
1755 * @return NULL on error
1757 struct GNUNET_TRANSPORT_Handle *
1758 GNUNET_TRANSPORT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
1759 const struct GNUNET_PeerIdentity *self,
1761 GNUNET_TRANSPORT_ReceiveCallback rec,
1762 GNUNET_TRANSPORT_NotifyConnect nc,
1763 GNUNET_TRANSPORT_NotifyDisconnect nd)
1765 return GNUNET_TRANSPORT_connect2 (cfg,
1776 * Connect to the transport service. Note that the connection may
1777 * complete (or fail) asynchronously.
1779 * @param cfg configuration to use
1780 * @param self our own identity (API should check that it matches
1781 * the identity found by transport), or NULL (no check)
1782 * @param cls closure for the callbacks
1783 * @param rec receive function to call
1784 * @param nc function to call on connect events
1785 * @param nd function to call on disconnect events
1786 * @param neb function to call if we have excess bandwidth to a peer
1787 * @return NULL on error
1789 struct GNUNET_TRANSPORT_Handle *
1790 GNUNET_TRANSPORT_connect2 (const struct GNUNET_CONFIGURATION_Handle *cfg,
1791 const struct GNUNET_PeerIdentity *self,
1793 GNUNET_TRANSPORT_ReceiveCallback rec,
1794 GNUNET_TRANSPORT_NotifyConnect nc,
1795 GNUNET_TRANSPORT_NotifyDisconnect nd,
1796 GNUNET_TRANSPORT_NotifyExcessBandwidth neb)
1798 struct GNUNET_TRANSPORT_Handle *ret;
1800 ret = GNUNET_new (struct GNUNET_TRANSPORT_Handle);
1804 ret->check_self = GNUNET_YES;
1812 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1813 LOG (GNUNET_ERROR_TYPE_DEBUG,
1814 "Connecting to transport service.\n");
1815 ret->client = GNUNET_CLIENT_connect ("transport",
1817 if (NULL == ret->client)
1823 GNUNET_CONTAINER_multipeermap_create (STARTING_NEIGHBOURS_SIZE,
1826 GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
1827 schedule_control_transmit (ret,
1828 sizeof (struct StartMessage),
1836 * Disconnect from the transport service.
1838 * @param handle handle to the service as returned from #GNUNET_TRANSPORT_connect()
1841 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1843 LOG (GNUNET_ERROR_TYPE_DEBUG,
1844 "Transport disconnect called!\n");
1845 /* this disconnects all neighbours... */
1846 if (handle->reconnect_task == NULL)
1847 disconnect_and_schedule_reconnect (handle);
1848 /* and now we stop trying to connect again... */
1849 if (handle->reconnect_task != NULL)
1851 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
1852 handle->reconnect_task = NULL;
1854 GNUNET_CONTAINER_multipeermap_destroy (handle->neighbours);
1855 handle->neighbours = NULL;
1856 if (handle->quota_task != NULL)
1858 GNUNET_SCHEDULER_cancel (handle->quota_task);
1859 handle->quota_task = NULL;
1861 GNUNET_free_non_null (handle->my_hello);
1862 handle->my_hello = NULL;
1863 GNUNET_assert (NULL == handle->tc_head);
1864 GNUNET_assert (NULL == handle->tc_tail);
1865 GNUNET_assert (NULL == handle->hwl_head);
1866 GNUNET_assert (NULL == handle->hwl_tail);
1867 GNUNET_CONTAINER_heap_destroy (handle->ready_heap);
1868 handle->ready_heap = NULL;
1869 GNUNET_free (handle);
1874 * Check if we could queue a message of the given size for
1875 * transmission. The transport service will take both its
1876 * internal buffers and bandwidth limits imposed by the
1877 * other peer into consideration when answering this query.
1879 * @param handle connection to transport service
1880 * @param target who should receive the message
1881 * @param size how big is the message we want to transmit?
1882 * @param timeout after how long should we give up (and call
1883 * notify with buf NULL and size 0)?
1884 * @param notify function to call when we are ready to
1885 * send such a message
1886 * @param notify_cls closure for @a notify
1887 * @return NULL if someone else is already waiting to be notified
1888 * non-NULL if the notify callback was queued (can be used to cancel
1889 * using #GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1891 struct GNUNET_TRANSPORT_TransmitHandle *
1892 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle *handle,
1893 const struct GNUNET_PeerIdentity *target,
1895 struct GNUNET_TIME_Relative timeout,
1896 GNUNET_TRANSPORT_TransmitReadyNotify notify,
1899 struct Neighbour *n;
1900 struct GNUNET_TRANSPORT_TransmitHandle *th;
1901 struct GNUNET_TIME_Relative delay;
1903 n = neighbour_find (handle, target);
1906 /* use GNUNET_TRANSPORT_try_connect first, only use this function
1907 * once a connection has been established */
1913 /* attempt to send two messages at the same time to the same peer */
1917 GNUNET_assert (NULL == n->hn);
1918 th = GNUNET_new (struct GNUNET_TRANSPORT_TransmitHandle);
1920 th->notify = notify;
1921 th->notify_cls = notify_cls;
1922 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1923 th->notify_size = size;
1925 /* calculate when our transmission should be ready */
1926 delay = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
1927 size + n->traffic_overhead);
1928 n->traffic_overhead = 0;
1929 if (delay.rel_value_us > timeout.rel_value_us)
1930 delay.rel_value_us = 0; /* notify immediately (with failure) */
1931 LOG (GNUNET_ERROR_TYPE_DEBUG,
1932 "Bandwidth tracker allows next transmission to peer %s in %s\n",
1933 GNUNET_i2s (target),
1934 GNUNET_STRINGS_relative_time_to_string (delay,
1936 n->hn = GNUNET_CONTAINER_heap_insert (handle->ready_heap,
1938 delay.rel_value_us);
1939 schedule_transmission (handle);
1945 * Cancel the specified transmission-ready notification.
1947 * @param th handle returned from #GNUNET_TRANSPORT_notify_transmit_ready()
1950 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct GNUNET_TRANSPORT_TransmitHandle *th)
1952 struct Neighbour *n;
1954 GNUNET_assert (NULL == th->next);
1955 GNUNET_assert (NULL == th->prev);
1957 GNUNET_assert (th == n->th);
1961 GNUNET_CONTAINER_heap_remove_node (n->hn);
1966 GNUNET_assert (NULL != th->timeout_task);
1967 GNUNET_SCHEDULER_cancel (th->timeout_task);
1968 th->timeout_task = NULL;
1974 /* end of transport_api.c */