2 This file is part of GNUnet.
3 (C) 2009, 2010 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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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_client_lib.h"
28 #include "gnunet_constants.h"
29 #include "gnunet_container_lib.h"
30 #include "gnunet_arm_service.h"
31 #include "gnunet_hello_lib.h"
32 #include "gnunet_protocols.h"
33 #include "gnunet_server_lib.h"
34 #include "gnunet_time_lib.h"
35 #include "gnunet_transport_service.h"
36 #include "transport.h"
39 * After how long do we give up on transmitting a HELLO
42 #define OFFER_HELLO_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 30)
45 * After how long do we automatically retry an unsuccessful
48 #define CONNECT_RETRY_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 750)
51 * How long should ARM wait when starting up the
52 * transport service before reporting back?
54 #define START_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
57 * How long should ARM wait when stopping the
58 * transport service before reporting back?
60 #define STOP_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
64 * What stage are we in for transmission processing?
74 * Message in local queue, not given to service.
79 * Message given to service, not confirmed (no SEND_OK).
84 * One message was given to service and before it was confirmed,
85 * another one was already queued (waiting for SEND_OK to pass on
88 TS_TRANSMITTED_QUEUED = 3
93 * Handle for a transmission-ready request.
95 struct GNUNET_TRANSPORT_TransmitHandle
99 * Neighbour for this handle, NULL for control-traffic.
101 struct NeighbourList *neighbour;
104 * Function to call when notify_size bytes are available
107 GNUNET_CONNECTION_TransmitReadyNotify notify;
110 * Closure for notify.
115 * transmit_ready task Id. The task is used to introduce the
116 * artificial delay that may be required to maintain the bandwidth
117 * limits. Later, this will be the ID of the "transmit_timeout"
118 * task which is used to signal a timeout if the transmission could
119 * not be done in a timely fashion.
121 GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
124 * Timeout for this request.
126 struct GNUNET_TIME_Absolute timeout;
129 * How many bytes is our notify callback waiting for?
134 * How important is this message?
136 unsigned int priority;
142 * Handle for a control message queue entry.
144 struct ControlMessage
148 * This is a doubly-linked list.
150 struct ControlMessage *next;
153 * This is a doubly-linked list.
155 struct ControlMessage *prev;
158 * Overall transport handle.
160 struct GNUNET_TRANSPORT_Handle *h;
163 * Function to call when notify_size bytes are available
166 GNUNET_CONNECTION_TransmitReadyNotify notify;
169 * Closure for notify.
174 * transmit_ready task Id. The task is used to introduce the
175 * artificial delay that may be required to maintain the bandwidth
176 * limits. Later, this will be the ID of the "transmit_timeout"
177 * task which is used to signal a timeout if the transmission could
178 * not be done in a timely fashion.
180 GNUNET_SCHEDULER_TaskIdentifier notify_delay_task;
183 * How many bytes is our notify callback waiting for?
191 * Entry in linked list of all of our current neighbours.
197 * This is a linked list.
199 struct NeighbourList *next;
202 * Overall transport handle.
204 struct GNUNET_TRANSPORT_Handle *h;
207 * Active transmit handle; available if 'transmit_forbidden'
210 struct GNUNET_TRANSPORT_TransmitHandle transmit_handle;
213 * Identity of this neighbour.
215 struct GNUNET_PeerIdentity id;
218 * At what time did we reset last_sent last?
220 struct GNUNET_TIME_Absolute last_quota_update;
223 * How many bytes have we sent since the "last_quota_update"
229 * Quota for outbound traffic to the neighbour in bytes/ms.
234 * Set to GNUNET_NO if we are currently allowed to accept a
235 * message to the transport service for this peer, GNUNET_YES
236 * if we have one and are waiting for transmission, GNUNET_SYSERR
237 * if we are waiting for confirmation AND have already accepted
238 * yet another message.
240 enum TransmitStage transmit_stage;
243 * Have we received a notification that this peer is connected
252 * Linked list of requests from clients for our HELLO that were
259 * This is a linked list.
261 struct HelloWaitList *next;
264 * Reference back to our transport handle.
266 struct GNUNET_TRANSPORT_Handle *handle;
269 * Callback to call once we got our HELLO.
271 GNUNET_TRANSPORT_HelloUpdateCallback rec;
282 * Handle for the transport service (includes all of the
283 * state for the transport service).
285 struct GNUNET_TRANSPORT_Handle
289 * Closure for the callbacks.
294 * Function to call for received data.
296 GNUNET_TRANSPORT_ReceiveCallback rec;
299 * function to call on connect events
301 GNUNET_TRANSPORT_NotifyConnect nc_cb;
304 * function to call on disconnect events
306 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
309 * Head of DLL of control messages.
311 struct ControlMessage *control_head;
314 * Tail of DLL of control messages.
316 struct ControlMessage *control_tail;
319 * The current HELLO message for this peer. Updated
320 * whenever transports change their addresses.
322 struct GNUNET_HELLO_Message *my_hello;
325 * My client connection to the transport service.
327 struct GNUNET_CLIENT_Connection *client;
330 * Handle to our registration with the client for notification.
332 struct GNUNET_CLIENT_TransmitHandle *network_handle;
335 * Linked list of pending requests for our HELLO.
337 struct HelloWaitList *hwl_head;
342 struct GNUNET_SCHEDULER_Handle *sched;
347 const struct GNUNET_CONFIGURATION_Handle *cfg;
350 * Linked list of the current neighbours of this peer.
352 struct NeighbourList *neighbours;
355 * ID of the task trying to reconnect to the service.
357 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
360 * ID of the task trying to trigger transmission for a peer
361 * while maintaining bandwidth quotas.
363 GNUNET_SCHEDULER_TaskIdentifier quota_task;
366 * Delay until we try to reconnect.
368 struct GNUNET_TIME_Relative reconnect_delay;
373 // FIXME: replace with hash map!
375 * Get the neighbour list entry for the given peer
377 * @param h our context
378 * @param peer peer to look up
379 * @return NULL if no such peer entry exists
381 static struct NeighbourList *
382 neighbour_find (struct GNUNET_TRANSPORT_Handle *h,
383 const struct GNUNET_PeerIdentity *peer)
385 struct NeighbourList *pos;
388 while ((pos != NULL) &&
389 (0 != memcmp (peer, &pos->id, sizeof (struct GNUNET_PeerIdentity))))
396 * Schedule the task to send one message, either from the control
397 * list or the peer message queues to the service.
399 static void schedule_transmission (struct GNUNET_TRANSPORT_Handle *h);
403 * Function called by the scheduler when the timeout for bandwidth
404 * availablility for the target neighbour is reached.
406 * @param cls the 'struct GNUNET_TRANSPORT_Handle*'
407 * @param tc scheduler context
410 quota_transmit_ready (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
412 struct GNUNET_TRANSPORT_Handle *h = cls;
414 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
415 schedule_transmission (h);
420 * Update the quota values for the given neighbour now.
422 * @param n neighbour to update
425 update_quota (struct NeighbourList *n)
427 struct GNUNET_TIME_Relative delta;
431 delta = GNUNET_TIME_absolute_get_duration (n->last_quota_update);
432 allowed = delta.value * n->quota_out;
433 if (n->last_sent < allowed)
435 remaining = allowed - n->last_sent;
436 if (n->quota_out > 0)
437 remaining /= n->quota_out;
440 if (remaining > MAX_BANDWIDTH_CARRY)
441 remaining = MAX_BANDWIDTH_CARRY;
443 n->last_quota_update = GNUNET_TIME_absolute_get ();
444 n->last_quota_update.value -= remaining;
448 n->last_sent -= allowed;
449 n->last_quota_update = GNUNET_TIME_absolute_get ();
455 * Figure out which transmission to a peer can be done right now.
456 * If none can, schedule a task to call 'schedule_transmission'
457 * whenever a peer transmission can be done in the future and
458 * return NULL. Otherwise return the next transmission to be
461 * @param h handle to transport
462 * @return NULL to wait longer before doing any peer transmissions
464 static struct GNUNET_TRANSPORT_TransmitHandle *
465 schedule_peer_transmission (struct GNUNET_TRANSPORT_Handle *h)
467 struct GNUNET_TRANSPORT_TransmitHandle *ret;
468 struct GNUNET_TRANSPORT_TransmitHandle *th;
469 struct NeighbourList *n;
470 struct NeighbourList *next;
471 struct GNUNET_TIME_Relative retry_time;
472 struct GNUNET_TIME_Relative duration;
475 if (h->quota_task != GNUNET_SCHEDULER_NO_TASK)
477 GNUNET_SCHEDULER_cancel (h->sched,
479 h->quota_task = GNUNET_SCHEDULER_NO_TASK;
481 retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
483 next = h->neighbours;
484 while (NULL != (n = next))
487 if (n->transmit_stage != TS_QUEUED)
488 continue; /* not eligible */
489 th = &n->transmit_handle;
490 /* check outgoing quota */
491 duration = GNUNET_TIME_absolute_get_duration (n->last_quota_update);
492 if (duration.value > MIN_QUOTA_REFRESH_TIME)
495 duration = GNUNET_TIME_absolute_get_duration (n->last_quota_update);
497 available = duration.value * n->quota_out;
498 if (available < n->last_sent + th->notify_size)
500 /* calculate how much bandwidth we'd still need to
501 accumulate and based on that how long we'll have
503 available = n->last_sent + th->notify_size - available;
504 duration = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS,
505 available / n->quota_out);
506 if (duration.value == 0)
507 duration = GNUNET_TIME_UNIT_MILLISECONDS;
508 if (th->timeout.value <
509 GNUNET_TIME_relative_to_absolute (duration).value)
511 /* signal timeout! */
513 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
514 "Would need %llu ms before bandwidth is available for delivery to `%4s', that is too long. Signaling timeout.\n",
515 duration.value, GNUNET_i2s (&n->id));
517 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
519 GNUNET_SCHEDULER_cancel (h->sched, th->notify_delay_task);
520 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
522 n->transmit_stage = TS_NEW;
523 if (NULL != th->notify)
524 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
528 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
529 "Need more bandwidth, delaying delivery to `%4s' by %llu ms\n",
530 GNUNET_i2s (&n->id), duration.value);
532 retry_time = GNUNET_TIME_relative_min (retry_time,
537 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
538 "Bandwidth available for transmission to `%4s'\n",
539 GNUNET_i2s (&n->id));
541 if ( (ret == NULL) ||
542 (ret->priority < th->priority) )
546 h->quota_task = GNUNET_SCHEDULER_add_delayed (h->sched,
548 "a_transmit_ready,
555 * Transmit message(s) to service.
557 * @param cls handle to transport
558 * @param size number of bytes available in buf
559 * @param buf where to copy the message
560 * @return number of bytes copied to buf
563 transport_notify_ready (void *cls, size_t size, void *buf)
565 struct GNUNET_TRANSPORT_Handle *h = cls;
566 struct ControlMessage *cm;
567 struct GNUNET_TRANSPORT_TransmitHandle *th;
568 struct NeighbourList *n;
569 struct OutboundMessage obm;
574 h->network_handle = NULL;
577 schedule_transmission (h);
581 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
582 "Ready to transmit %u bytes to transport service\n", size);
586 while ( (NULL != (cm = h->control_head)) &&
587 (cm->notify_size <= size) )
589 if (cm->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
591 GNUNET_SCHEDULER_cancel (h->sched, cm->notify_delay_task);
592 cm->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
594 GNUNET_CONTAINER_DLL_remove (h->control_head,
597 ret += cm->notify (cm->notify_cls, size, &cbuf[ret]);
601 while ( (NULL != (th = schedule_peer_transmission (h))) &&
602 (th->notify_size <= size) )
604 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
606 GNUNET_SCHEDULER_cancel (h->sched, th->notify_delay_task);
607 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
610 switch (n->transmit_stage)
616 n->transmit_stage = TS_TRANSMITTED;
621 case TS_TRANSMITTED_QUEUED:
627 GNUNET_assert (size >= sizeof (struct OutboundMessage));
628 mret = th->notify (th->notify_cls,
629 size - sizeof (struct OutboundMessage),
630 &cbuf[ret + sizeof (struct OutboundMessage)]);
631 GNUNET_assert (mret <= size - sizeof (struct OutboundMessage));
634 obm.header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SEND);
635 obm.header.size = htons (mret + sizeof (struct OutboundMessage));
636 obm.priority = htonl (th->priority);
637 obm.timeout = GNUNET_TIME_relative_hton (GNUNET_TIME_absolute_get_remaining (th->timeout));
639 memcpy (&cbuf[ret], &obm, sizeof (struct OutboundMessage));
640 ret += (mret + sizeof (struct OutboundMessage));
641 size -= (mret + sizeof (struct OutboundMessage));
644 schedule_transmission (h);
646 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
647 "Transmitting %u bytes to transport service\n", ret);
654 * Schedule the task to send one message, either from the control
655 * list or the peer message queues to the service.
658 schedule_transmission (struct GNUNET_TRANSPORT_Handle *h)
661 struct GNUNET_TIME_Relative timeout;
662 struct GNUNET_TRANSPORT_TransmitHandle *th;
664 if (NULL != h->network_handle)
666 if (h->client == NULL)
668 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
669 "Could not yet schedule transmission: we are not yet connected to the transport service!\n");
670 return; /* not yet connected */
672 if (NULL != h->control_head)
674 size = h->control_head->notify_size;
675 timeout = GNUNET_TIME_UNIT_FOREVER_REL;
679 th = schedule_peer_transmission (h);
682 /* no transmission ready right now */
685 size = th->notify_size;
686 timeout = GNUNET_TIME_absolute_get_remaining (th->timeout);
689 GNUNET_CLIENT_notify_transmit_ready (h->client,
693 &transport_notify_ready,
695 GNUNET_assert (NULL != h->network_handle);
700 * Called when our transmit request timed out before any transport
701 * reported success connecting to the desired peer or before the
702 * transport was ready to receive. Signal error and free
706 control_transmit_timeout (void *cls,
707 const struct GNUNET_SCHEDULER_TaskContext *tc)
709 struct ControlMessage *th = cls;
711 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
712 if (NULL != th->notify)
713 th->notify (th->notify_cls, 0, NULL);
714 GNUNET_CONTAINER_DLL_remove (th->h->control_head,
722 * Queue control request for transmission to the transport
725 * @param h handle to the transport service
726 * @param size number of bytes to be transmitted
727 * @param at_head request must be added to the head of the queue
728 * (otherwise request will be appended)
729 * @param timeout how long this transmission can wait (at most)
730 * @param notify function to call to get the content
731 * @param notify_cls closure for notify
734 schedule_control_transmit (struct GNUNET_TRANSPORT_Handle *h,
737 struct GNUNET_TIME_Relative timeout,
738 GNUNET_CONNECTION_TransmitReadyNotify notify,
741 struct ControlMessage *th;
744 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
745 "Control transmit of %u bytes within %llums requested\n",
746 size, (unsigned long long) timeout.value);
748 th = GNUNET_malloc (sizeof (struct ControlMessage));
751 th->notify_cls = notify_cls;
752 th->notify_size = size;
753 th->notify_delay_task
754 = GNUNET_SCHEDULER_add_delayed (h->sched,
755 timeout, &control_transmit_timeout, th);
757 GNUNET_CONTAINER_DLL_insert (h->control_head,
761 GNUNET_CONTAINER_DLL_insert_after (h->control_head,
765 schedule_transmission (h);
769 struct SetQuotaContext
771 struct GNUNET_TRANSPORT_Handle *handle;
773 struct GNUNET_PeerIdentity target;
775 GNUNET_SCHEDULER_Task cont;
779 struct GNUNET_TIME_Absolute timeout;
786 * Send SET_QUOTA message to the service.
788 * @param cls the 'struct SetQuotaContext'
789 * @param size number of bytes available in buf
790 * @param buf where to copy the message
791 * @return number of bytes copied to buf
794 send_set_quota (void *cls, size_t size, void *buf)
796 struct SetQuotaContext *sqc = cls;
797 struct QuotaSetMessage *msg;
801 GNUNET_SCHEDULER_add_continuation (sqc->handle->sched,
804 GNUNET_SCHEDULER_REASON_TIMEOUT);
809 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
810 "Transmitting `%s' request with respect to `%4s'.\n",
812 GNUNET_i2s (&sqc->target));
814 GNUNET_assert (size >= sizeof (struct QuotaSetMessage));
816 msg->header.size = htons (sizeof (struct QuotaSetMessage));
817 msg->header.type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_SET_QUOTA);
818 msg->quota_in = htonl (sqc->quota_in);
819 memcpy (&msg->peer, &sqc->target, sizeof (struct GNUNET_PeerIdentity));
820 if (sqc->cont != NULL)
821 GNUNET_SCHEDULER_add_continuation (sqc->handle->sched,
824 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
826 return sizeof (struct QuotaSetMessage);
831 * Set the share of incoming bandwidth for the given
832 * peer to the specified amount.
834 * @param handle connection to transport service
835 * @param target who's bandwidth quota is being changed
836 * @param quota_in incoming bandwidth quota in bytes per ms
837 * @param quota_out outgoing bandwidth quota in bytes per ms
838 * @param timeout how long to wait until signaling failure if
839 * we can not communicate the quota change
840 * @param cont continuation to call when done, will be called
841 * either with reason "TIMEOUT" or with reason "PREREQ_DONE"
842 * @param cont_cls closure for continuation
845 GNUNET_TRANSPORT_set_quota (struct GNUNET_TRANSPORT_Handle *handle,
846 const struct GNUNET_PeerIdentity *target,
849 struct GNUNET_TIME_Relative timeout,
850 GNUNET_SCHEDULER_Task cont, void *cont_cls)
852 struct NeighbourList *n;
853 struct SetQuotaContext *sqc;
855 n = neighbour_find (handle, target);
859 if (n->quota_out < quota_out)
860 n->last_quota_update = GNUNET_TIME_absolute_get ();
861 n->quota_out = quota_out;
863 sqc = GNUNET_malloc (sizeof (struct SetQuotaContext));
864 sqc->handle = handle;
865 sqc->target = *target;
867 sqc->cont_cls = cont_cls;
868 sqc->timeout = GNUNET_TIME_relative_to_absolute (timeout);
869 sqc->quota_in = quota_in;
870 schedule_control_transmit (handle,
871 sizeof (struct QuotaSetMessage),
872 GNUNET_NO, timeout, &send_set_quota, sqc);
877 * Obtain the HELLO message for this peer.
879 * @param handle connection to transport service
880 * @param timeout how long to wait for the HELLO
881 * @param rec function to call with the HELLO, sender will be our peer
882 * identity; message and sender will be NULL on timeout
883 * (handshake with transport service pending/failed).
884 * cost estimate will be 0.
885 * @param rec_cls closure for rec
888 GNUNET_TRANSPORT_get_hello (struct GNUNET_TRANSPORT_Handle *handle,
889 GNUNET_TRANSPORT_HelloUpdateCallback rec,
892 struct HelloWaitList *hwl;
894 hwl = GNUNET_malloc (sizeof (struct HelloWaitList));
895 hwl->next = handle->hwl_head;
896 handle->hwl_head = hwl;
897 hwl->handle = handle;
899 hwl->rec_cls = rec_cls;
900 if (handle->my_hello == NULL)
902 rec (rec_cls, (const struct GNUNET_MessageHeader *) handle->my_hello);
908 * Stop receiving updates about changes to our HELLO message.
910 * @param handle connection to transport service
911 * @param rec function previously registered to be called with the HELLOs
912 * @param rec_cls closure for rec
915 GNUNET_TRANSPORT_get_hello_cancel (struct GNUNET_TRANSPORT_Handle *handle,
916 GNUNET_TRANSPORT_HelloUpdateCallback rec,
919 struct HelloWaitList *pos;
920 struct HelloWaitList *prev;
923 pos = handle->hwl_head;
926 if ( (pos->rec == rec) &&
927 (pos->rec_cls == rec_cls) )
932 GNUNET_break (pos != NULL);
936 handle->hwl_head = pos->next;
938 prev->next = pos->next;
944 * Send HELLO message to the service.
946 * @param cls the HELLO message to send
947 * @param size number of bytes available in buf
948 * @param buf where to copy the message
949 * @return number of bytes copied to buf
952 send_hello (void *cls, size_t size, void *buf)
954 struct GNUNET_MessageHeader *hello = cls;
960 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
961 "Timeout while trying to transmit `%s' request.\n",
968 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
969 "Transmitting `%s' request.\n", "HELLO");
971 msize = ntohs (hello->size);
972 GNUNET_assert (size >= msize);
973 memcpy (buf, hello, msize);
980 * Offer the transport service the HELLO of another peer. Note that
981 * the transport service may just ignore this message if the HELLO is
982 * malformed or useless due to our local configuration.
984 * @param handle connection to transport service
985 * @param hello the hello message
988 GNUNET_TRANSPORT_offer_hello (struct GNUNET_TRANSPORT_Handle *handle,
989 const struct GNUNET_MessageHeader *hello)
991 struct GNUNET_MessageHeader *hc;
994 GNUNET_break (ntohs (hello->type) == GNUNET_MESSAGE_TYPE_HELLO);
995 size = ntohs (hello->size);
996 GNUNET_break (size >= sizeof (struct GNUNET_MessageHeader));
997 hc = GNUNET_malloc (size);
998 memcpy (hc, hello, size);
999 schedule_control_transmit (handle,
1001 GNUNET_NO, OFFER_HELLO_TIMEOUT, &send_hello, hc);
1006 * Transmit START message to service.
1009 * @param size number of bytes available in buf
1010 * @param buf where to copy the message
1011 * @return number of bytes copied to buf
1014 send_start (void *cls, size_t size, void *buf)
1016 struct GNUNET_MessageHeader *s = buf;
1020 /* Can only be shutdown, just give up */
1022 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1023 "Shutdown while trying to transmit `%s' request.\n",
1029 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1030 "Transmitting `%s' request.\n", "START");
1032 GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
1033 s->size = htons (sizeof (struct GNUNET_MessageHeader));
1034 s->type = htons (GNUNET_MESSAGE_TYPE_TRANSPORT_START);
1035 return sizeof (struct GNUNET_MessageHeader);
1042 * @param h our state
1043 * @param n the entry to free
1046 neighbour_free (struct NeighbourList *n)
1048 struct GNUNET_TRANSPORT_Handle *h;
1049 struct NeighbourList *prev;
1050 struct NeighbourList *pos;
1054 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1055 "Removing neighbour `%s' from list of connected peers.\n",
1056 GNUNET_i2s (&n->id));
1058 GNUNET_break (n->is_connected == GNUNET_NO);
1059 GNUNET_break (n->transmit_stage == TS_NEW);
1062 pos = h->neighbours;
1069 h->neighbours = n->next;
1071 prev->next = n->next;
1077 * Mark neighbour as disconnected.
1079 * @param n the entry to mark as disconnected
1082 neighbour_disconnect (struct NeighbourList *n)
1084 struct GNUNET_TRANSPORT_Handle *h = n->h;
1086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1087 "Removing neighbour `%s' from list of connected peers.\n",
1088 GNUNET_i2s (&n->id));
1090 GNUNET_break (n->is_connected == GNUNET_YES);
1091 n->is_connected = GNUNET_NO;
1092 if (h->nc_cb != NULL)
1093 h->nd_cb (h->cls, &n->id);
1094 if (n->transmit_stage == TS_NEW)
1100 * Function we use for handling incoming messages.
1102 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
1103 * @param msg message received, NULL on timeout or fatal error
1105 static void demultiplexer (void *cls,
1106 const struct GNUNET_MessageHeader *msg);
1110 * Try again to connect to transport service.
1112 * @param cls the handle to the transport service
1113 * @param tc scheduler context
1116 reconnect (void *cls,
1117 const struct GNUNET_SCHEDULER_TaskContext *tc)
1119 struct GNUNET_TRANSPORT_Handle *h = cls;
1120 struct ControlMessage *pos;
1121 struct NeighbourList *n;
1123 if ( (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN) != 0)
1125 /* shutdown, just give up */
1128 /* Forget about all neighbours that we used to be connected to */
1132 neighbour_disconnect (n);
1136 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
1138 GNUNET_assert (h->client == NULL);
1139 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1140 h->client = GNUNET_CLIENT_connect (h->sched, "transport", h->cfg);
1141 GNUNET_assert (h->client != NULL);
1142 /* make sure we don't send "START" twice, remove existing entry from
1143 queue (if present) */
1144 pos = h->control_head;
1147 if (pos->notify == &send_start)
1149 GNUNET_CONTAINER_DLL_remove (h->control_head,
1152 if (GNUNET_SCHEDULER_NO_TASK != pos->notify_delay_task)
1154 GNUNET_SCHEDULER_cancel (h->sched, pos->notify_delay_task);
1155 pos->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1162 schedule_control_transmit (h,
1163 sizeof (struct GNUNET_MessageHeader),
1165 GNUNET_TIME_UNIT_FOREVER_REL, &send_start, NULL);
1166 GNUNET_CLIENT_receive (h->client,
1167 &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
1172 * Function that will schedule the job that will try
1173 * to connect us again to the client.
1175 * @param h transport service to reconnect
1178 schedule_reconnect (struct GNUNET_TRANSPORT_Handle *h)
1181 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1182 "Scheduling task to reconnect to transport service in %llu ms.\n",
1183 h->reconnect_delay.value);
1185 GNUNET_assert (h->client == NULL);
1186 GNUNET_assert (h->reconnect_task == GNUNET_SCHEDULER_NO_TASK);
1188 = GNUNET_SCHEDULER_add_delayed (h->sched,
1189 h->reconnect_delay, &reconnect, h);
1190 if (h->reconnect_delay.value == 0)
1192 h->reconnect_delay = GNUNET_TIME_UNIT_MILLISECONDS;
1196 h->reconnect_delay = GNUNET_TIME_relative_multiply (h->reconnect_delay, 2);
1197 h->reconnect_delay = GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
1198 h->reconnect_delay);
1204 * Add neighbour to our list
1206 static struct NeighbourList *
1207 neighbour_add (struct GNUNET_TRANSPORT_Handle *h,
1208 const struct GNUNET_PeerIdentity *pid)
1210 struct NeighbourList *n;
1212 /* check for duplicates */
1213 if (NULL != (n = neighbour_find (h, pid)))
1219 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1220 "Creating entry for neighbour `%4s'.\n",
1223 n = GNUNET_malloc (sizeof (struct NeighbourList));
1225 n->last_quota_update = GNUNET_TIME_absolute_get ();
1226 n->next = h->neighbours;
1227 n->quota_out = GNUNET_CONSTANTS_DEFAULT_BPM_IN_OUT;
1235 * Connect to the transport service. Note that the connection may
1236 * complete (or fail) asynchronously.
1238 * @param sched scheduler to use
1239 * @param cfg configuration to use
1240 * @param cls closure for the callbacks
1241 * @param rec receive function to call
1242 * @param nc function to call on connect events
1243 * @param nd function to call on disconnect events
1245 struct GNUNET_TRANSPORT_Handle *
1246 GNUNET_TRANSPORT_connect (struct GNUNET_SCHEDULER_Handle *sched,
1247 const struct GNUNET_CONFIGURATION_Handle *cfg,
1249 GNUNET_TRANSPORT_ReceiveCallback rec,
1250 GNUNET_TRANSPORT_NotifyConnect nc,
1251 GNUNET_TRANSPORT_NotifyDisconnect nd)
1253 struct GNUNET_TRANSPORT_Handle *ret;
1255 GNUNET_ARM_start_services (cfg, sched, "peerinfo", "transport", NULL);
1256 ret = GNUNET_malloc (sizeof (struct GNUNET_TRANSPORT_Handle));
1263 ret->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
1264 schedule_reconnect (ret);
1270 * Disconnect from the transport service.
1273 GNUNET_TRANSPORT_disconnect (struct GNUNET_TRANSPORT_Handle *handle)
1275 struct GNUNET_TRANSPORT_TransmitHandle *th;
1276 struct NeighbourList *n;
1277 struct HelloWaitList *hwl;
1278 struct GNUNET_CLIENT_Connection *client;
1281 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
1283 while (NULL != (n = handle->neighbours))
1285 handle->neighbours = n->next;
1286 switch (n->transmit_stage)
1289 case TS_TRANSMITTED:
1293 case TS_TRANSMITTED_QUEUED:
1294 th = &n->transmit_handle;
1295 if (th->notify_delay_task != GNUNET_SCHEDULER_NO_TASK)
1297 GNUNET_SCHEDULER_cancel (handle->sched,
1298 th->notify_delay_task);
1299 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1301 GNUNET_assert (0 == th->notify (th->notify_cls, 0, NULL));
1308 while (NULL != (hwl = handle->hwl_head))
1310 handle->hwl_head = hwl->next;
1311 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
1313 ("Disconnect while notification for `%s' still registered.\n"),
1315 if (hwl->rec != NULL)
1316 hwl->rec (hwl->rec_cls, NULL);
1319 if (handle->reconnect_task != GNUNET_SCHEDULER_NO_TASK)
1321 GNUNET_SCHEDULER_cancel (handle->sched, handle->reconnect_task);
1322 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1324 if (handle->quota_task != GNUNET_SCHEDULER_NO_TASK)
1326 GNUNET_SCHEDULER_cancel (handle->sched, handle->quota_task);
1327 handle->quota_task = GNUNET_SCHEDULER_NO_TASK;
1329 GNUNET_free_non_null (handle->my_hello);
1330 handle->my_hello = NULL;
1331 GNUNET_ARM_stop_services (handle->cfg, handle->sched, "transport",
1333 if (NULL != handle->network_handle)
1335 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->network_handle);
1336 handle->network_handle = NULL;
1338 if (NULL != (client = handle->client))
1341 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1342 "Disconnecting from transport service for good.\n");
1344 handle->client = NULL;
1345 GNUNET_CLIENT_disconnect (client);
1347 GNUNET_free (handle);
1352 * Function we use for handling incoming messages.
1354 * @param cls closure (struct GNUNET_TRANSPORT_Handle *)
1355 * @param msg message received, NULL on timeout or fatal error
1358 demultiplexer (void *cls, const struct GNUNET_MessageHeader *msg)
1360 struct GNUNET_TRANSPORT_Handle *h = cls;
1361 const struct DisconnectInfoMessage *dim;
1362 const struct ConnectInfoMessage *cim;
1363 const struct InboundMessage *im;
1364 const struct GNUNET_MessageHeader *imm;
1365 const struct SendOkMessage *okm;
1366 struct HelloWaitList *hwl;
1367 struct HelloWaitList *next_hwl;
1368 struct NeighbourList *n;
1369 struct GNUNET_PeerIdentity me;
1372 if (h->client == NULL)
1374 /* shutdown initiated from 'GNUNET_TRANSPORT_disconnect',
1375 finish clean up work! */
1382 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1383 "Error receiving from transport service, disconnecting temporarily.\n");
1385 if (h->network_handle != NULL)
1387 GNUNET_CLIENT_notify_transmit_ready_cancel (h->network_handle);
1388 h->network_handle = NULL;
1390 GNUNET_CLIENT_disconnect (h->client);
1392 schedule_reconnect (h);
1395 GNUNET_CLIENT_receive (h->client,
1396 &demultiplexer, h, GNUNET_TIME_UNIT_FOREVER_REL);
1397 size = ntohs (msg->size);
1398 switch (ntohs (msg->type))
1400 case GNUNET_MESSAGE_TYPE_HELLO:
1402 GNUNET_HELLO_get_id ((const struct GNUNET_HELLO_Message *) msg,
1409 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1410 "Receiving (my own) `%s' message, I am `%4s'.\n",
1411 "HELLO", GNUNET_i2s (&me));
1413 GNUNET_free_non_null (h->my_hello);
1415 if (size < sizeof (struct GNUNET_MessageHeader))
1420 h->my_hello = GNUNET_malloc (size);
1421 memcpy (h->my_hello, msg, size);
1425 next_hwl = hwl->next;
1426 hwl->rec (hwl->rec_cls,
1427 (const struct GNUNET_MessageHeader *) h->my_hello);
1431 case GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT:
1432 if (size != sizeof (struct ConnectInfoMessage))
1437 cim = (const struct ConnectInfoMessage *) msg;
1439 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1440 "Receiving `%s' message for `%4s'.\n",
1441 "CONNECT", GNUNET_i2s (&cim->id));
1443 n = neighbour_find (h, &cim->id);
1445 n = neighbour_add (h,
1447 GNUNET_break (n->is_connected == GNUNET_NO);
1448 n->is_connected = GNUNET_YES;
1449 if (h->nc_cb != NULL)
1450 h->nc_cb (h->cls, &n->id,
1451 GNUNET_TIME_relative_ntoh (cim->latency),
1452 ntohs (cim->distance));
1454 case GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT:
1455 if (size != sizeof (struct DisconnectInfoMessage))
1460 dim = (const struct DisconnectInfoMessage *) msg;
1462 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1463 "Receiving `%s' message for `%4s'.\n",
1465 GNUNET_i2s (&dim->peer));
1467 n = neighbour_find (h, &cim->id);
1468 GNUNET_break (n != NULL);
1470 neighbour_disconnect (n);
1472 case GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK:
1473 if (size != sizeof (struct SendOkMessage))
1478 okm = (const struct SendOkMessage *) msg;
1480 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1481 "Receiving `%s' message, transmission %s.\n", "SEND_OK",
1482 ntohl (okm->success) == GNUNET_OK ? "succeeded" : "failed");
1484 n = neighbour_find (h, &okm->peer);
1485 GNUNET_assert (n != NULL);
1486 switch (n->transmit_stage)
1494 case TS_TRANSMITTED:
1495 n->transmit_stage = TS_NEW;
1497 case TS_TRANSMITTED_QUEUED:
1498 n->transmit_stage = TS_QUEUED;
1499 schedule_transmission (h);
1505 case GNUNET_MESSAGE_TYPE_TRANSPORT_RECV:
1507 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1508 "Receiving `%s' message.\n", "RECV");
1511 sizeof (struct InboundMessage) +
1512 sizeof (struct GNUNET_MessageHeader))
1517 im = (const struct InboundMessage *) msg;
1518 imm = (const struct GNUNET_MessageHeader *) &im[1];
1519 if (ntohs (imm->size) + sizeof (struct InboundMessage) != size)
1525 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1526 "Received message of type %u from `%4s'.\n",
1527 ntohs (imm->type), GNUNET_i2s (&im->peer));
1529 n = neighbour_find (h, &im->peer);
1536 h->rec (h->cls, &im->peer, imm,
1537 GNUNET_TIME_relative_ntoh (im->latency), ntohs(im->distance));
1540 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1542 ("Received unexpected message of type %u in %s:%u\n"),
1543 ntohs (msg->type), __FILE__, __LINE__);
1551 * Called when our transmit request timed out before any transport
1552 * reported success connecting to the desired peer or before the
1553 * transport was ready to receive. Signal error and free
1556 * @param cls the 'struct GNUNET_TRANSPORT_TransmitHandle*' that is timing out
1557 * @param tc scheduler context
1560 peer_transmit_timeout (void *cls,
1561 const struct GNUNET_SCHEDULER_TaskContext *tc)
1563 struct GNUNET_TRANSPORT_TransmitHandle *th = cls;
1564 struct NeighbourList *n;
1566 th->notify_delay_task = GNUNET_SCHEDULER_NO_TASK;
1568 switch (n->transmit_stage)
1574 n->transmit_stage = TS_NEW;
1575 if (n->is_connected == GNUNET_NO)
1578 case TS_TRANSMITTED:
1581 case TS_TRANSMITTED_QUEUED:
1582 n->transmit_stage = TS_TRANSMITTED;
1587 if (NULL != th->notify)
1588 th->notify (th->notify_cls, 0, NULL);
1593 * Check if we could queue a message of the given size for
1594 * transmission. The transport service will take both its
1595 * internal buffers and bandwidth limits imposed by the
1596 * other peer into consideration when answering this query.
1598 * @param handle connection to transport service
1599 * @param target who should receive the message
1600 * @param size how big is the message we want to transmit?
1601 * @param priority how important is the message?
1602 * @param timeout after how long should we give up (and call
1603 * notify with buf NULL and size 0)?
1604 * @param notify function to call when we are ready to
1605 * send such a message
1606 * @param notify_cls closure for notify
1607 * @return NULL if someone else is already waiting to be notified
1608 * non-NULL if the notify callback was queued (can be used to cancel
1609 * using GNUNET_TRANSPORT_notify_transmit_ready_cancel)
1611 struct GNUNET_TRANSPORT_TransmitHandle *
1612 GNUNET_TRANSPORT_notify_transmit_ready (struct GNUNET_TRANSPORT_Handle
1614 const struct GNUNET_PeerIdentity
1615 *target, size_t size,
1616 unsigned int priority,
1617 struct GNUNET_TIME_Relative timeout,
1618 GNUNET_CONNECTION_TransmitReadyNotify
1619 notify, void *notify_cls)
1621 struct GNUNET_TRANSPORT_TransmitHandle *th;
1622 struct NeighbourList *n;
1624 if (size + sizeof (struct OutboundMessage) >=
1625 GNUNET_SERVER_MAX_MESSAGE_SIZE)
1628 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1629 "Message size is %d, max allowed is %d.\n",
1630 size + sizeof (struct OutboundMessage), GNUNET_SERVER_MAX_MESSAGE_SIZE);
1636 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1637 "Asking transport service for transmission of %u bytes to peer `%4s'.\n",
1638 size, GNUNET_i2s (target));
1640 n = neighbour_find (handle, target);
1642 n = neighbour_add (handle, target);
1645 switch (n->transmit_stage)
1648 n->transmit_stage = TS_QUEUED;
1652 case TS_TRANSMITTED:
1653 n->transmit_stage = TS_TRANSMITTED_QUEUED;
1655 case TS_TRANSMITTED_QUEUED:
1662 th = &n->transmit_handle;
1664 th->notify = notify;
1665 th->notify_cls = notify_cls;
1666 th->timeout = GNUNET_TIME_relative_to_absolute (timeout);
1667 th->notify_size = size + sizeof (struct OutboundMessage);
1668 th->priority = priority;
1669 th->notify_delay_task
1670 = GNUNET_SCHEDULER_add_delayed (handle->sched, timeout,
1671 &peer_transmit_timeout, th);
1672 schedule_transmission (handle);
1678 * Cancel the specified transmission-ready notification.
1681 GNUNET_TRANSPORT_notify_transmit_ready_cancel (struct
1682 GNUNET_TRANSPORT_TransmitHandle
1685 struct NeighbourList *n;
1689 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1690 "Transmission request of %u bytes to `%4s' was cancelled.\n",
1691 th->notify_size - sizeof (struct OutboundMessage),
1692 GNUNET_i2s (&n->id));
1694 switch (n->transmit_stage)
1700 n->transmit_stage = TS_NEW;
1701 if (n->is_connected == GNUNET_NO)
1704 case TS_TRANSMITTED:
1707 case TS_TRANSMITTED_QUEUED:
1708 n->transmit_stage = TS_TRANSMITTED;
1716 /* end of transport_api.c */