2 This file is part of GNUnet.
3 (C) 2009, 2010 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 2, 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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22 * @file transport/transport_api.c
23 * @brief library to access the low-level P2P IO service
24 * @author Christian Grothoff
27 #include "gnunet_bandwidth_lib.h"
28 #include "gnunet_client_lib.h"
29 #include "gnunet_constants.h"
30 #include "gnunet_container_lib.h"
31 #include "gnunet_arm_service.h"
32 #include "gnunet_hello_lib.h"
33 #include "gnunet_protocols.h"
34 #include "gnunet_server_lib.h"
35 #include "gnunet_time_lib.h"
36 #include "gnunet_transport_service.h"
37 #include "transport.h"
40 * After how long do we give up on transmitting a HELLO
43 #define OFFER_HELLO_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
46 * After how long do we automatically retry an unsuccessful
49 #define CONNECT_RETRY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 750)
52 * How long should ARM wait when starting up the
53 * transport service before reporting back?
55 #define START_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
58 * How long should ARM wait when stopping the
59 * transport service before reporting back?
61 #define STOP_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
65 * What stage are we in for transmission processing?
75 * Message in local queue, not given to service.
80 * Message given to service, not confirmed (no SEND_OK).
85 * One message was given to service and before it was confirmed,
86 * another one was already queued (waiting for SEND_OK to pass on
89 TS_TRANSMITTED_QUEUED = 3
94 * Handle for a transmission-ready request.
96 struct GNUNET_TRANSPORT_TransmitHandle
100 * Neighbour for this handle, NULL for control-traffic.
102 struct NeighbourList *neighbour;
105 * Function to call when notify_size bytes are available
108 GNUNET_CONNECTION_TransmitReadyNotify notify;
111 * Closure for notify.
116 * transmit_ready task Id. The task is used to introduce the
117 * artificial delay that may be required to maintain the bandwidth
118 * limits. Later, this will be the ID of the "transmit_timeout"
119 * task which is used to signal a timeout if the transmission could
120 * not be done in a timely fashion.
122 GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
125 * Timeout for this request.
127 struct GNUNET_TIME_Absolute timeout;
130 * How many bytes is our notify callback waiting for?
135 * How important is this message?
137 unsigned int priority;
143 * Handle for a control message queue entry.
145 struct ControlMessage
149 * This is a doubly-linked list.
151 struct ControlMessage *next;
154 * This is a doubly-linked list.
156 struct ControlMessage *prev;
159 * Overall transport handle.
161 struct GNUNET_TRANSPORT_Handle *h;
164 * Function to call when notify_size bytes are available
167 GNUNET_CONNECTION_TransmitReadyNotify notify;
170 * Closure for notify.
175 * transmit_ready task Id. The task is used to introduce the
176 * artificial delay that may be required to maintain the bandwidth
177 * limits. Later, this will be the ID of the "transmit_timeout"
178 * task which is used to signal a timeout if the transmission could
179 * not be done in a timely fashion.
181 GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
184 * How many bytes is our notify callback waiting for?
192 * Entry in linked list of all of our current neighbours.
198 * This is a linked list.
200 struct NeighbourList *next;
203 * Overall transport handle.
205 struct GNUNET_TRANSPORT_Handle *h;
208 * Active transmit handle; available if 'transmit_forbidden'
211 struct GNUNET_TRANSPORT_TransmitHandle transmit_handle;
214 * Identity of this neighbour.
216 struct GNUNET_PeerIdentity id;
219 * Outbound bandwidh tracker.
221 struct GNUNET_BANDWIDTH_Tracker out_tracker;
224 * Set to GNUNET_NO if we are currently allowed to accept a
225 * message to the transport service for this peer, GNUNET_YES
226 * if we have one and are waiting for transmission, GNUNET_SYSERR
227 * if we are waiting for confirmation AND have already accepted
228 * yet another message.
230 enum TransmitStage transmit_stage;
233 * Have we received a notification that this peer is connected
242 * Linked list of requests from clients for our HELLO that were
249 * This is a linked list.
251 struct HelloWaitList *next;
254 * Reference back to our transport handle.
256 struct GNUNET_TRANSPORT_Handle *handle;
259 * Callback to call once we got our HELLO.
261 GNUNET_TRANSPORT_HelloUpdateCallback rec;
272 * Handle for the transport service (includes all of the
273 * state for the transport service).
275 struct GNUNET_TRANSPORT_Handle
279 * Closure for the callbacks.
284 * Function to call for received data.
286 GNUNET_TRANSPORT_ReceiveCallback rec;
289 * function to call on connect events
291 GNUNET_TRANSPORT_NotifyConnect nc_cb;
294 * function to call on disconnect events
296 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
299 * Head of DLL of control messages.
301 struct ControlMessage *control_head;
304 * Tail of DLL of control messages.
306 struct ControlMessage *control_tail;
309 * The current HELLO message for this peer. Updated
310 * whenever transports change their addresses.
312 struct GNUNET_HELLO_Message *my_hello;
315 * My client connection to the transport service.
317 struct GNUNET_CLIENT_Connection *client;
320 * Handle to our registration with the client for notification.
322 struct GNUNET_CLIENT_TransmitHandle *network_handle;
325 * Linked list of pending requests for our HELLO.
327 struct HelloWaitList *hwl_head;
332 struct GNUNET_SCHEDULER_Handle *sched;
337 const struct GNUNET_CONFIGURATION_Handle *cfg;
340 * Linked list of the current neighbours of this peer.
342 struct NeighbourList *neighbours;
345 * ID of the task trying to reconnect to the service.
347 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
350 * ID of the task trying to trigger transmission for a peer
351 * while maintaining bandwidth quotas.
353 GNUNET_SCHEDULER_TaskIdentifier quota_task;
356 * Delay until we try to reconnect.
358 struct GNUNET_TIME_Relative reconnect_delay;
361 * Set once we are in the process of disconnecting from the
369 // FIXME: replace with hash map!
371 * Get the neighbour list entry for the given peer
373 * @param h our context
374 * @param peer peer to look up
375 * @return NULL if no such peer entry exists
377 static struct NeighbourList *
378 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
379 const struct GNUNET_PeerIdentity *peer)
381 struct NeighbourList *pos;
384 while ((pos != NULL) &&
385 (0 != memcmp (peer, &pos->id, sizeof (struct GNUNET_PeerIdentity))))
392 * Schedule the task to send one message, either from the control
393 * list or the peer message queues to the service.
395 static void schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
399 * Function called by the scheduler when the timeout for bandwidth
400 * availablility for the target neighbour is reached.
402 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
403 * @param tc scheduler context
406 quota_transmit_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
408 struct GNUNET_TRANSPORT_Handle *h = cls;
410 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
411 schedule_transmission (h);
416 * Figure out which transmission to a peer can be done right now.
417 * If none can, schedule a task to call 'schedule_transmission'
418 * whenever a peer transmission can be done in the future and
419 * return NULL. Otherwise return the next transmission to be
422 * @param h handle to transport
423 * @return NULL to wait longer before doing any peer transmissions
425 static struct GNUNET_TRANSPORT_TransmitHandle *
426 schedule_peer_transmission (struct GNUNET_TRANSPORT_Handle *h)
428 struct GNUNET_TRANSPORT_TransmitHandle *ret;
429 struct GNUNET_TRANSPORT_TransmitHandle *th;
430 struct NeighbourList *n;
431 struct NeighbourList *next;
432 struct GNUNET_TIME_Relative retry_time;
433 struct GNUNET_TIME_Relative duration;
435 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
437 GNUNET_SCHEDULER_cancel (h->sched,
439 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
441 retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
443 next = h->neighbours;
444 while (NULL != (n = next))
447 if (n->transmit_stage != TS_QUEUED)
448 continue; /* not eligible */
449 th = &n->transmit_handle;
450 GNUNET_break (n == th->neighbour);
451 /* check outgoing quota */
452 duration = GNUNET_BANDWIDTH_tracker_get_delay (&n->out_tracker,
453 th->notify_size - sizeof (struct OutboundMessage));
454 if (th->timeout.value < duration.value)
456 /* signal timeout! */
458 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
459 "Would need %llu ms before bandwidth is available for delivery to `%4s', that is too long. Signaling timeout.\n",
461 GNUNET_i2s (&n->id));
463 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
465 GNUNET_SCHEDULER_cancel (h->sched, th->notify_delay_task);
466 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
468 n->transmit_stage = TS_NEW;
469 if (NULL != th->notify)
470 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
473 if (duration.value > 0)
476 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
477 "Need more bandwidth (%u b/s allowed, %u b needed), delaying delivery to `%4s' by %llu ms\n",
478 (unsigned int) n->out_tracker.available_bytes_per_s__,
479 (unsigned int) th->notify_size - sizeof (struct OutboundMessage),
483 retry_time = GNUNET_TIME_relative_min (retry_time,
488 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
489 "Have %u bytes of bandwidth available for transmission to `%4s' right now\n",
490 th->notify_size - sizeof (struct OutboundMessage),
491 GNUNET_i2s (&n->id));
493 if ( (ret == NULL) ||
494 (ret->priority < th->priority) )
498 h->quota_task = GNUNET_SCHEDULER_add_delayed (h->sched,
500 "a_transmit_ready,
507 * Transmit message(s) to service.
509 * @param cls handle to transport
510 * @param size number of bytes available in buf
511 * @param buf where to copy the message
512 * @return number of bytes copied to buf
515 transport_notify_ready (void *cls, size_t size, void *buf)
517 struct GNUNET_TRANSPORT_Handle *h = cls;
518 struct ControlMessage *cm;
519 struct GNUNET_TRANSPORT_TransmitHandle *th;
520 struct NeighbourList *n;
521 struct OutboundMessage obm;
527 h->network_handle = NULL;
530 schedule_transmission (h);
534 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
535 "Ready to transmit %u bytes to transport service\n", size);
539 while ( (NULL != (cm = h->control_head)) &&
540 (cm->notify_size <= size) )
542 if (cm->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
544 GNUNET_SCHEDULER_cancel (h->sched, cm->notify_delay_task);
545 cm->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
547 GNUNET_CONTAINER_DLL_remove (h->control_head,
550 nret = cm->notify (cm->notify_cls, size, &cbuf[ret]);
552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
553 "Added %u bytes of control message at %u\n",
561 while ( (NULL != (th = schedule_peer_transmission (h))) &&
562 (th->notify_size <= size) )
564 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
566 GNUNET_SCHEDULER_cancel (h->sched, th->notify_delay_task);
567 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
570 switch (n->transmit_stage)
576 n->transmit_stage = TS_TRANSMITTED;
581 case TS_TRANSMITTED_QUEUED:
587 GNUNET_assert (size >= sizeof (struct OutboundMessage));
588 mret = th->notify (th->notify_cls,
589 size - sizeof (struct OutboundMessage),
590 &cbuf[ret + sizeof (struct OutboundMessage)]);
591 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
592 "Added %u bytes of data message at %u\n",
595 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
597 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
598 "Message of %u bytes with timeout %llums constructed for `%4s'\n",
600 (unsigned long long) GNUNET_TIME_absolute_get_remaining (th->timeout).value,
601 GNUNET_i2s (&n->id));
605 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
606 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
607 obm.priority = htonl (th->priority);
608 obm.timeout = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (th->timeout));
610 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
611 ret += (mret + sizeof (struct OutboundMessage));
612 size -= (mret + sizeof (struct OutboundMessage));
613 GNUNET_BANDWIDTH_tracker_consume (&n->out_tracker, mret);
617 switch (n->transmit_stage)
626 n->transmit_stage = TS_NEW;
628 case TS_TRANSMITTED_QUEUED:
629 n->transmit_stage = TS_QUEUED;
636 schedule_transmission (h);
638 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
639 "Transmitting %u bytes to transport service\n", ret);
646 * Schedule the task to send one message, either from the control
647 * list or the peer message queues to the service.
650 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
653 struct GNUNET_TIME_Relative timeout;
654 struct GNUNET_TRANSPORT_TransmitHandle *th;
656 if (NULL != h->network_handle)
658 if (h->client == NULL)
660 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
661 _("Could not yet schedule transmission: we are not yet connected to the transport service!\n"));
662 return; /* not yet connected */
664 if (NULL != h->control_head)
666 size = h->control_head->notify_size;
667 timeout = GNUNET_TIME_UNIT_FOREVER_REL;
671 th = schedule_peer_transmission (h);
674 /* no transmission ready right now */
676 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
677 "Could not yet schedule transmission: none ready\n");
681 size = th->notify_size;
682 timeout = GNUNET_TIME_absolute_get_remaining (th->timeout);
685 GNUNET_CLIENT_notify_transmit_ready (h->client,
689 &transport_notify_ready,
691 GNUNET_assert (NULL != h->network_handle);
696 * Called when our transmit request timed out before any transport
697 * reported success connecting to the desired peer or before the
698 * transport was ready to receive. Signal error and free
702 control_transmit_timeout (void *cls,
703 const struct GNUNET_SCHEDULER_TaskContext *tc)
705 struct ControlMessage *th = cls;
707 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
708 if (NULL != th->notify)
709 th->notify (th->notify_cls, 0, NULL);
710 GNUNET_CONTAINER_DLL_remove (th->h->control_head,
718 * Queue control request for transmission to the transport
721 * @param h handle to the transport service
722 * @param size number of bytes to be transmitted
723 * @param at_head request must be added to the head of the queue
724 * (otherwise request will be appended)
725 * @param timeout how long this transmission can wait (at most)
726 * @param notify function to call to get the content
727 * @param notify_cls closure for notify
730 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
733 struct GNUNET_TIME_Relative timeout,
734 GNUNET_CONNECTION_TransmitReadyNotify notify,
737 struct ControlMessage *th;
740 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
741 "Control transmit of %u bytes within %llums requested\n",
742 size, (unsigned long long) timeout.value);
744 th = GNUNET_malloc (sizeof (struct ControlMessage));
747 th->notify_cls = notify_cls;
748 th->notify_size = size;
749 th->notify_delay_task
750 = GNUNET_SCHEDULER_add_delayed (h->sched,
751 timeout, &control_transmit_timeout, th);
753 GNUNET_CONTAINER_DLL_insert (h->control_head,
757 GNUNET_CONTAINER_DLL_insert_after (h->control_head,
761 schedule_transmission (h);
765 struct SetQuotaContext
767 struct GNUNET_TRANSPORT_Handle *handle;
769 struct GNUNET_PeerIdentity target;
771 GNUNET_SCHEDULER_Task cont;
775 struct GNUNET_TIME_Absolute timeout;
777 struct GNUNET_BANDWIDTH_Value32NBO quota_in;
782 * Send SET_QUOTA message to the service.
784 * @param cls the 'struct SetQuotaContext'
785 * @param size number of bytes available in buf
786 * @param buf where to copy the message
787 * @return number of bytes copied to buf
790 send_set_quota (void *cls, size_t size, void *buf)
792 struct SetQuotaContext *sqc = cls;
793 struct QuotaSetMessage *msg;
797 GNUNET_SCHEDULER_add_continuation (sqc->handle->sched,
800 GNUNET_SCHEDULER_REASON_TIMEOUT);
805 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
806 "Transmitting `%s' request with respect to `%4s'.\n",
808 GNUNET_i2s (&sqc->target));
810 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
812 msg->header.size = htons (sizeof (struct QuotaSetMessage));
813 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
814 msg->quota = sqc->quota_in;
815 memcpy (&msg->peer, &sqc->target, sizeof (struct GNUNET_PeerIdentity));
816 if (sqc->cont != NULL)
817 GNUNET_SCHEDULER_add_continuation (sqc->handle->sched,
820 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
822 return sizeof (struct QuotaSetMessage);
827 * Set the share of incoming bandwidth for the given
828 * peer to the specified amount.
830 * @param handle connection to transport service
831 * @param target who's bandwidth quota is being changed
832 * @param quota_in incoming bandwidth quota in bytes per ms
833 * @param quota_out outgoing bandwidth quota in bytes per ms
834 * @param timeout how long to wait until signaling failure if
835 * we can not communicate the quota change
836 * @param cont continuation to call when done, will be called
837 * either with reason "TIMEOUT" or with reason "PREREQ_DONE"
838 * @param cont_cls closure for continuation
841 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
842 const struct GNUNET_PeerIdentity *target,
843 struct GNUNET_BANDWIDTH_Value32NBO quota_in,
844 struct GNUNET_BANDWIDTH_Value32NBO quota_out,
845 struct GNUNET_TIME_Relative timeout,
846 GNUNET_SCHEDULER_Task cont, void *cont_cls)
848 struct NeighbourList *n;
849 struct SetQuotaContext *sqc;
851 n = neighbour_find (handle, target);
855 if (ntohl (quota_out.value__) != n->out_tracker.available_bytes_per_s__)
856 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
857 "Quota changed from %u to %u for peer `%s'\n",
858 (unsigned int) n->out_tracker.available_bytes_per_s__,
859 (unsigned int) ntohl (quota_out.value__),
860 GNUNET_i2s (target));
862 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
863 "Quota remains at %u for peer `%s'\n",
864 (unsigned int) n->out_tracker.available_bytes_per_s__,
865 GNUNET_i2s (target));
867 GNUNET_BANDWIDTH_tracker_update_quota (&n->out_tracker,
873 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
874 "Quota changed to %u for peer `%s', but I have no such neighbour!\n",
875 (unsigned int) ntohl (quota_out.value__),
876 GNUNET_i2s (target));
879 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
880 sqc->handle = handle;
881 sqc->target = *target;
883 sqc->cont_cls = cont_cls;
884 sqc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
885 sqc->quota_in = quota_in;
886 schedule_control_transmit (handle,
887 sizeof (struct QuotaSetMessage),
888 GNUNET_NO, timeout, &send_set_quota, sqc);
893 * Obtain the HELLO message for this peer.
895 * @param handle connection to transport service
896 * @param rec function to call with the HELLO, sender will be our peer
897 * identity; message and sender will be NULL on timeout
898 * (handshake with transport service pending/failed).
899 * cost estimate will be 0.
900 * @param rec_cls closure for rec
903 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
904 GNUNET_TRANSPORT_HelloUpdateCallback rec,
907 struct HelloWaitList *hwl;
909 hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
910 hwl->next = handle->hwl_head;
911 handle->hwl_head = hwl;
912 hwl->handle = handle;
914 hwl->rec_cls = rec_cls;
915 if (handle->my_hello == NULL)
917 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
923 * Stop receiving updates about changes to our HELLO message.
925 * @param handle connection to transport service
926 * @param rec function previously registered to be called with the HELLOs
927 * @param rec_cls closure for rec
930 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
931 GNUNET_TRANSPORT_HelloUpdateCallback rec,
934 struct HelloWaitList *pos;
935 struct HelloWaitList *prev;
938 pos = handle->hwl_head;
941 if ( (pos->rec == rec) &&
942 (pos->rec_cls == rec_cls) )
947 GNUNET_break (pos != NULL);
951 handle->hwl_head = pos->next;
953 prev->next = pos->next;
959 * Send HELLO message to the service.
961 * @param cls the HELLO message to send
962 * @param size number of bytes available in buf
963 * @param buf where to copy the message
964 * @return number of bytes copied to buf
967 send_hello (void *cls, size_t size, void *buf)
969 struct GNUNET_MessageHeader *hello = cls;
974 #if DEBUG_TRANSPORT_TIMEOUT
975 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
976 "Timeout while trying to transmit `%s' request.\n",
983 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
984 "Transmitting `%s' request.\n", "HELLO");
986 msize = ntohs (hello->size);
987 GNUNET_assert (size >= msize);
988 memcpy (buf, hello, msize);
995 * Offer the transport service the HELLO of another peer. Note that
996 * the transport service may just ignore this message if the HELLO is
997 * malformed or useless due to our local configuration.
999 * @param handle connection to transport service
1000 * @param hello the hello message
1003 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
1004 const struct GNUNET_MessageHeader *hello)
1006 struct GNUNET_MessageHeader *hc;
1008 struct GNUNET_PeerIdentity peer;
1010 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
1011 size = ntohs (hello->size);
1012 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
1013 if (GNUNET_OK != GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message*) hello,
1020 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1021 "Offering `%s' message of `%4s' to transport for validation.\n",
1023 GNUNET_i2s (&peer));
1025 hc = GNUNET_malloc (size);
1026 memcpy (hc, hello, size);
1027 schedule_control_transmit (handle,
1029 GNUNET_NO, OFFER_HELLO_TIMEOUT, &send_hello, hc);
1034 * Transmit START message to service.
1037 * @param size number of bytes available in buf
1038 * @param buf where to copy the message
1039 * @return number of bytes copied to buf
1042 send_start (void *cls, size_t size, void *buf)
1044 struct GNUNET_MessageHeader *s = buf;
1048 /* Can only be shutdown, just give up */
1050 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1051 "Shutdown while trying to transmit `%s' request.\n",
1057 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1058 "Transmitting `%s' request.\n", "START");
1060 GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
1061 s->size = htons (sizeof (struct GNUNET_MessageHeader));
1062 s->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
1063 return sizeof (struct GNUNET_MessageHeader);
1070 * @param n the entry to free
1073 neighbour_free (struct NeighbourList *n)
1075 struct GNUNET_TRANSPORT_Handle *h;
1076 struct NeighbourList *prev;
1077 struct NeighbourList *pos;
1081 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1082 "Removing neighbour `%s' from list of connected peers.\n",
1083 GNUNET_i2s (&n->id));
1085 GNUNET_break (n->is_connected == GNUNET_NO);
1086 GNUNET_break (n->transmit_stage == TS_NEW);
1089 pos = h->neighbours;
1096 h->neighbours = n->next;
1098 prev->next = n->next;
1104 * Mark neighbour as disconnected.
1106 * @param n the entry to mark as disconnected
1109 neighbour_disconnect (struct NeighbourList *n)
1111 struct GNUNET_TRANSPORT_Handle *h = n->h;
1113 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1114 "Removing neighbour `%s' from list of connected peers.\n",
1115 GNUNET_i2s (&n->id));
1117 GNUNET_break (n->is_connected == GNUNET_YES);
1118 n->is_connected = GNUNET_NO;
1119 if (h->nc_cb != NULL)
1120 h->nd_cb (h->cls, &n->id);
1121 if (n->transmit_stage == TS_NEW)
1127 * Function we use for handling incoming messages.
1129 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
1130 * @param msg message received, NULL on timeout or fatal error
1132 static void demultiplexer (void *cls,
1133 const struct GNUNET_MessageHeader *msg);
1137 * Try again to connect to transport service.
1139 * @param cls the handle to the transport service
1140 * @param tc scheduler context
1143 reconnect (void *cls,
1144 const struct GNUNET_SCHEDULER_TaskContext *tc)
1146 struct GNUNET_TRANSPORT_Handle *h = cls;
1147 struct ControlMessage *pos;
1148 struct NeighbourList *n;
1149 struct NeighbourList *next;
1151 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1152 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1154 /* shutdown, just give up */
1157 /* Forget about all neighbours that we used to be connected to */
1161 #if DEBUG_TRANSPORT_DISCONNECT
1162 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1163 "Disconnecting due to reconnect being called\n");
1166 if (n->is_connected)
1167 neighbour_disconnect (n);
1171 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1172 "Connecting to transport service.\n");
1174 GNUNET_assert (h->client == NULL);
1175 h->client = GNUNET_CLIENT_connect (h->sched, "transport", h->cfg);
1176 GNUNET_assert (h->client != NULL);
1177 /* make sure we don't send "START" twice, remove existing entry from
1178 queue (if present) */
1179 pos = h->control_head;
1182 if (pos->notify == &send_start)
1184 GNUNET_CONTAINER_DLL_remove (h->control_head,
1187 if (GNUNET_SCHEDULER_NO_TASK != pos->notify_delay_task)
1189 GNUNET_SCHEDULER_cancel (h->sched, pos->notify_delay_task);
1190 pos->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1197 schedule_control_transmit (h,
1198 sizeof (struct GNUNET_MessageHeader),
1200 GNUNET_TIME_UNIT_FOREVER_REL, &send_start, NULL);
1201 GNUNET_CLIENT_receive (h->client,
1202 &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
1207 * Function that will schedule the job that will try
1208 * to connect us again to the client.
1210 * @param h transport service to reconnect
1213 schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
1216 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1217 "Scheduling task to reconnect to transport service in %llu ms.\n",
1218 h->reconnect_delay.value);
1220 GNUNET_assert (h->client == NULL);
1221 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
1223 = GNUNET_SCHEDULER_add_delayed (h->sched,
1224 h->reconnect_delay, &reconnect, h);
1225 if (h->reconnect_delay.value == 0)
1227 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1231 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
1232 h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
1233 h->reconnect_delay);
1239 * Add neighbour to our list
1241 * @return NULL if this API is currently disconnecting from the service
1243 static struct NeighbourList *
1244 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
1245 const struct GNUNET_PeerIdentity *pid)
1247 struct NeighbourList *n;
1249 if (GNUNET_YES == h->in_disconnect)
1251 /* check for duplicates */
1252 if (NULL != (n = neighbour_find (h, pid)))
1258 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1259 "Creating entry for neighbour `%4s'.\n",
1262 n = GNUNET_malloc (sizeof (struct NeighbourList));
1264 GNUNET_BANDWIDTH_tracker_init (&n->out_tracker,
1265 GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT,
1266 MAX_BANDWIDTH_CARRY_S);
1267 n->next = h->neighbours;
1275 * Connect to the transport service. Note that the connection may
1276 * complete (or fail) asynchronously.
1278 * @param sched scheduler to use
1279 * @param cfg configuration to use
1280 * @param cls closure for the callbacks
1281 * @param rec receive function to call
1282 * @param nc function to call on connect events
1283 * @param nd function to call on disconnect events
1285 struct GNUNET_TRANSPORT_Handle *
1286 GNUNET_TRANSPORT_connect (struct GNUNET_SCHEDULER_Handle *sched,
1287 const struct GNUNET_CONFIGURATION_Handle *cfg,
1289 GNUNET_TRANSPORT_ReceiveCallback rec,
1290 GNUNET_TRANSPORT_NotifyConnect nc,
1291 GNUNET_TRANSPORT_NotifyDisconnect nd)
1293 struct GNUNET_TRANSPORT_Handle *ret;
1295 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1302 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1303 schedule_reconnect (ret);
1309 * Disconnect from the transport service.
1312 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1314 struct GNUNET_TRANSPORT_TransmitHandle *th;
1315 struct NeighbourList *n;
1316 struct HelloWaitList *hwl;
1317 struct GNUNET_CLIENT_Connection *client;
1318 struct ControlMessage *cm;
1321 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1323 handle->in_disconnect = GNUNET_YES;
1324 while (NULL != (n = handle->neighbours))
1326 handle->neighbours = n->next;
1327 switch (n->transmit_stage)
1330 case TS_TRANSMITTED:
1334 case TS_TRANSMITTED_QUEUED:
1335 th = &n->transmit_handle;
1336 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
1338 GNUNET_SCHEDULER_cancel (handle->sched,
1339 th->notify_delay_task);
1340 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1342 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
1349 while (NULL != (hwl = handle->hwl_head))
1351 handle->hwl_head = hwl->next;
1352 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1354 ("Disconnect while notification for `%s' still registered.\n"),
1356 if (hwl->rec != NULL)
1357 hwl->rec (hwl->rec_cls, NULL);
1361 /* Check for still scheduled control messages, cancel delay tasks if so */
1362 /* Added because somehow a notify_delay_task is remaining scheduled and is ever so annoying */
1363 while ( (NULL != (cm = handle->control_head)))
1365 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1366 _("Disconnect before control message sent!\n"));
1367 if (cm->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
1369 GNUNET_SCHEDULER_cancel (handle->sched, cm->notify_delay_task);
1370 cm->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1372 GNUNET_CONTAINER_DLL_remove (handle->control_head,
1373 handle->control_tail,
1379 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1381 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
1382 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1384 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1386 GNUNET_SCHEDULER_cancel (handle->sched, handle->quota_task);
1387 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1389 GNUNET_free_non_null (handle->my_hello);
1390 handle->my_hello = NULL;
1392 if (NULL != handle->network_handle)
1394 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->network_handle);
1395 handle->network_handle = NULL;
1397 if (NULL != (client = handle->client))
1400 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1401 "Disconnecting from transport service for good.\n");
1403 handle->client = NULL;
1404 GNUNET_CLIENT_disconnect (client, GNUNET_NO);
1406 GNUNET_free (handle);
1411 * Function we use for handling incoming messages.
1413 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
1414 * @param msg message received, NULL on timeout or fatal error
1417 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
1419 struct GNUNET_TRANSPORT_Handle *h = cls;
1420 const struct DisconnectInfoMessage *dim;
1421 const struct ConnectInfoMessage *cim;
1422 const struct InboundMessage *im;
1423 const struct GNUNET_MessageHeader *imm;
1424 const struct SendOkMessage *okm;
1425 struct HelloWaitList *hwl;
1426 struct HelloWaitList *next_hwl;
1427 struct NeighbourList *n;
1428 struct GNUNET_PeerIdentity me;
1431 if (h->client == NULL)
1433 /* shutdown initiated from 'GNUNET_TRANSPORT_disconnect',
1434 finish clean up work! */
1441 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1442 "Error receiving from transport service, disconnecting temporarily.\n");
1444 if (h->network_handle != NULL)
1446 GNUNET_CLIENT_notify_transmit_ready_cancel (h->network_handle);
1447 h->network_handle = NULL;
1449 GNUNET_CLIENT_disconnect (h->client, GNUNET_NO);
1451 schedule_reconnect (h);
1454 GNUNET_CLIENT_receive (h->client,
1455 &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
1456 size = ntohs (msg->size);
1457 switch (ntohs (msg->type))
1459 case GNUNET_MESSAGE_TYPE_HELLO:
1461 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
1468 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1469 "Receiving (my own) `%s' message, I am `%4s'.\n",
1470 "HELLO", GNUNET_i2s (&me));
1472 GNUNET_free_non_null (h->my_hello);
1474 if (size < sizeof (struct GNUNET_MessageHeader))
1479 h->my_hello = GNUNET_malloc (size);
1480 memcpy (h->my_hello, msg, size);
1484 next_hwl = hwl->next;
1485 hwl->rec (hwl->rec_cls,
1486 (const struct GNUNET_MessageHeader *) h->my_hello);
1490 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
1491 if (size != sizeof (struct ConnectInfoMessage))
1496 cim = (const struct ConnectInfoMessage *) msg;
1498 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1499 "Receiving `%s' message for `%4s'.\n",
1500 "CONNECT", GNUNET_i2s (&cim->id));
1502 n = neighbour_find (h, &cim->id);
1504 n = neighbour_add (h,
1508 GNUNET_break (n->is_connected == GNUNET_NO);
1509 n->is_connected = GNUNET_YES;
1510 if (h->nc_cb != NULL)
1511 h->nc_cb (h->cls, &n->id,
1512 GNUNET_TIME_relative_ntoh (cim->latency),
1513 ntohl (cim->distance));
1515 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
1516 if (size != sizeof (struct DisconnectInfoMessage))
1521 dim = (const struct DisconnectInfoMessage *) msg;
1522 #if DEBUG_TRANSPORT_DISCONNECT
1523 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1524 "Receiving `%s' message for `%4s'.\n",
1526 GNUNET_i2s (&dim->peer));
1528 n = neighbour_find (h, &dim->peer);
1529 GNUNET_break (n != NULL);
1531 neighbour_disconnect (n);
1533 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
1534 if (size != sizeof (struct SendOkMessage))
1539 okm = (const struct SendOkMessage *) msg;
1541 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1542 "Receiving `%s' message, transmission %s.\n", "SEND_OK",
1543 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
1545 n = neighbour_find (h, &okm->peer);
1546 GNUNET_assert (n != NULL);
1547 switch (n->transmit_stage)
1555 case TS_TRANSMITTED:
1556 n->transmit_stage = TS_NEW;
1558 case TS_TRANSMITTED_QUEUED:
1559 n->transmit_stage = TS_QUEUED;
1560 schedule_transmission (h);
1566 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
1568 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1569 "Receiving `%s' message.\n", "RECV");
1572 sizeof (struct InboundMessage) +
1573 sizeof (struct GNUNET_MessageHeader))
1578 im = (const struct InboundMessage *) msg;
1579 imm = (const struct GNUNET_MessageHeader *) &im[1];
1580 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
1586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1587 "Received message of type %u from `%4s'.\n",
1588 ntohs (imm->type), GNUNET_i2s (&im->peer));
1590 n = neighbour_find (h, &im->peer);
1596 if (n->is_connected != GNUNET_YES)
1602 h->rec (h->cls, &im->peer, imm,
1603 GNUNET_TIME_relative_ntoh (im->latency), ntohl(im->distance));
1606 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1608 ("Received unexpected message of type %u in %s:%u\n"),
1609 ntohs (msg->type), __FILE__, __LINE__);
1617 * Called when our transmit request timed out before any transport
1618 * reported success connecting to the desired peer or before the
1619 * transport was ready to receive. Signal error and free
1622 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle*' that is timing out
1623 * @param tc scheduler context
1626 peer_transmit_timeout (void *cls,
1627 const struct GNUNET_SCHEDULER_TaskContext *tc)
1629 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
1630 struct NeighbourList *n;
1631 GNUNET_CONNECTION_TransmitReadyNotify notify;
1634 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1637 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1638 "Triggering timeout for request to transmit to `%4s' (%d)\n",
1639 GNUNET_i2s (&n->id),
1642 notify = th->notify;
1643 notify_cls = th->notify_cls;
1644 switch (n->transmit_stage)
1650 n->transmit_stage = TS_NEW;
1651 if (n->is_connected == GNUNET_NO)
1654 case TS_TRANSMITTED:
1657 case TS_TRANSMITTED_QUEUED:
1658 n->transmit_stage = TS_TRANSMITTED;
1664 notify (notify_cls, 0, NULL);
1669 * Check if we could queue a message of the given size for
1670 * transmission. The transport service will take both its
1671 * internal buffers and bandwidth limits imposed by the
1672 * other peer into consideration when answering this query.
1674 * @param handle connection to transport service
1675 * @param target who should receive the message
1676 * @param size how big is the message we want to transmit?
1677 * @param priority how important is the message?
1678 * @param timeout after how long should we give up (and call
1679 * notify with buf NULL and size 0)?
1680 * @param notify function to call when we are ready to
1681 * send such a message
1682 * @param notify_cls closure for notify
1683 * @return NULL if someone else is already waiting to be notified
1684 * non-NULL if the notify callback was queued (can be used to cancel
1685 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1687 struct GNUNET_TRANSPORT_TransmitHandle *
1688 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle
1690 const struct GNUNET_PeerIdentity
1691 *target, size_t size,
1692 unsigned int priority,
1693 struct GNUNET_TIME_Relative timeout,
1694 GNUNET_CONNECTION_TransmitReadyNotify
1695 notify, void *notify_cls)
1697 struct GNUNET_TRANSPORT_TransmitHandle *th;
1698 struct NeighbourList *n;
1700 if (size + sizeof (struct OutboundMessage) >=
1701 GNUNET_SERVER_MAX_MESSAGE_SIZE)
1704 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1705 "Message size is %d, max allowed is %d.\n",
1706 size + sizeof (struct OutboundMessage), GNUNET_SERVER_MAX_MESSAGE_SIZE);
1712 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1713 "Asking transport service for transmission of %u bytes to peer `%4s' within %llu ms.\n",
1714 size, GNUNET_i2s (target),
1715 (unsigned long long) timeout.value);
1717 n = neighbour_find (handle, target);
1719 n = neighbour_add (handle, target);
1722 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1723 "Could not create neighbour entry for peer `%s'\n",
1724 GNUNET_i2s (target));
1727 switch (n->transmit_stage)
1730 n->transmit_stage = TS_QUEUED;
1735 case TS_TRANSMITTED:
1736 n->transmit_stage = TS_TRANSMITTED_QUEUED;
1738 case TS_TRANSMITTED_QUEUED:
1745 th = &n->transmit_handle;
1747 th->notify = notify;
1748 th->notify_cls = notify_cls;
1749 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1750 th->notify_size = size + sizeof (struct OutboundMessage);
1751 th->priority = priority;
1752 th->notify_delay_task
1753 = GNUNET_SCHEDULER_add_delayed (handle->sched, timeout,
1754 &peer_transmit_timeout, th);
1755 schedule_transmission (handle);
1761 * Cancel the specified transmission-ready notification.
1764 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1765 GNUNET_TRANSPORT_TransmitHandle
1768 struct NeighbourList *n;
1772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1773 "Transmission request of %u bytes to `%4s' was cancelled.\n",
1774 th->notify_size - sizeof (struct OutboundMessage),
1775 GNUNET_i2s (&n->id));
1777 switch (n->transmit_stage)
1783 n->transmit_stage = TS_NEW;
1784 if (n->is_connected == GNUNET_NO)
1787 case TS_TRANSMITTED:
1790 case TS_TRANSMITTED_QUEUED:
1791 n->transmit_stage = TS_TRANSMITTED;
1799 /* end of transport_api.c */