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diff --git a/src/transport/transport_api2_core.c b/src/transport/transport_api2_core.c
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2009-2013, 2016, 2018 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file transport/transport_api_core.c
23 * @brief library to access the transport service for message exchange
24 * @author Christian Grothoff
25 */
26#include "platform.h"
27#include "gnunet_util_lib.h"
28#include "gnunet_constants.h"
29#include "gnunet_arm_service.h"
30#include "gnunet_hello_lib.h"
31#include "gnunet_protocols.h"
32#include "gnunet_transport_core_service.h"
33#include "transport.h"
34
35#define LOG(kind, ...) GNUNET_log_from (kind, "transport-api-core", __VA_ARGS__)
36
37/**
38 * How large to start with for the hashmap of neighbours.
39 */
40#define STARTING_NEIGHBOURS_SIZE 16
41
42/**
43 * Window size. How many messages to the same target do we pass
44 * to TRANSPORT without a SEND_OK in between? Small values limit
45 * thoughput, large values will increase latency.
46 *
47 * FIXME-OPTIMIZE: find out what good values are experimentally,
48 * maybe set adaptively (i.e. to observed available bandwidth).
49 */
50#define SEND_WINDOW_SIZE 4
51
52
53/**
54 * Entry in hash table of all of our current (connected) neighbours.
55 */
56struct Neighbour
57{
58 /**
59 * Identity of this neighbour.
60 */
61 struct GNUNET_PeerIdentity id;
62
63 /**
64 * Overall transport handle.
65 */
66 struct GNUNET_TRANSPORT_CoreHandle *h;
67
68 /**
69 * Active message queue for the peer.
70 */
71 struct GNUNET_MQ_Handle *mq;
72
73 /**
74 * Envelope with the message we are currently transmitting (or NULL).
75 */
76 struct GNUNET_MQ_Envelope *env;
77
78 /**
79 * Closure for @e mq handlers.
80 */
81 void *handlers_cls;
82
83 /**
84 * How many messages can we still send to this peer before we should
85 * throttle?
86 */
87 unsigned int ready_window;
88
89 /**
90 * Used to indicate our status if @e env is non-NULL. Set to
91 * #GNUNET_YES if we did pass a message to the MQ and are waiting
92 * for the call to #notify_send_done(). Set to #GNUNET_NO if the @e
93 * ready_window is 0 and @e env is waiting for a
94 * #GNUNET_MESSAGE_TYPE_TRANSPORT_RECV_OK?
95 */
96 int16_t awaiting_done;
97
98 /**
99 * Size of the message in @e env.
100 */
101 uint16_t env_size;
102};
103
104
105/**
106 * Handle for the transport service (includes all of the
107 * state for the transport service).
108 */
109struct GNUNET_TRANSPORT_CoreHandle
110{
111 /**
112 * Closure for the callbacks.
113 */
114 void *cls;
115
116 /**
117 * Functions to call for received data (template for
118 * new message queues).
119 */
120 struct GNUNET_MQ_MessageHandler *handlers;
121
122 /**
123 * function to call on connect events
124 */
125 GNUNET_TRANSPORT_NotifyConnect nc_cb;
126
127 /**
128 * function to call on disconnect events
129 */
130 GNUNET_TRANSPORT_NotifyDisconnect nd_cb;
131
132 /**
133 * My client connection to the transport service.
134 */
135 struct GNUNET_MQ_Handle *mq;
136
137 /**
138 * My configuration.
139 */
140 const struct GNUNET_CONFIGURATION_Handle *cfg;
141
142 /**
143 * Hash map of the current connected neighbours of this peer.
144 * Maps peer identities to `struct Neighbour` entries.
145 */
146 struct GNUNET_CONTAINER_MultiPeerMap *neighbours;
147
148 /**
149 * Peer identity as assumed by this process, or all zeros.
150 */
151 struct GNUNET_PeerIdentity self;
152
153 /**
154 * ID of the task trying to reconnect to the service.
155 */
156 struct GNUNET_SCHEDULER_Task *reconnect_task;
157
158 /**
159 * Delay until we try to reconnect.
160 */
161 struct GNUNET_TIME_Relative reconnect_delay;
162
163 /**
164 * Should we check that @e self matches what the service thinks?
165 * (if #GNUNET_NO, then @e self is all zeros!).
166 */
167 int check_self;
168};
169
170
171/**
172 * Function that will schedule the job that will try
173 * to connect us again to the client.
174 *
175 * @param h transport service to reconnect
176 */
177static void
178disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_CoreHandle *h);
179
180
181/**
182 * Get the neighbour list entry for the given peer
183 *
184 * @param h our context
185 * @param peer peer to look up
186 * @return NULL if no such peer entry exists
187 */
188static struct Neighbour *
189neighbour_find (struct GNUNET_TRANSPORT_CoreHandle *h,
190 const struct GNUNET_PeerIdentity *peer)
191{
192 return GNUNET_CONTAINER_multipeermap_get (h->neighbours, peer);
193}
194
195
196/**
197 * Iterator over hash map entries, for deleting state of a neighbour.
198 *
199 * @param cls the `struct GNUNET_TRANSPORT_CoreHandle *`
200 * @param key peer identity
201 * @param value value in the hash map, the neighbour entry to delete
202 * @return #GNUNET_YES if we should continue to
203 * iterate,
204 * #GNUNET_NO if not.
205 */
206static int
207neighbour_delete (void *cls, const struct GNUNET_PeerIdentity *key, void *value)
208{
209 struct GNUNET_TRANSPORT_CoreHandle *handle = cls;
210 struct Neighbour *n = value;
211
212 LOG (GNUNET_ERROR_TYPE_DEBUG,
213 "Dropping entry for neighbour `%s'.\n",
214 GNUNET_i2s (key));
215 if (NULL != handle->nd_cb)
216 handle->nd_cb (handle->cls, &n->id, n->handlers_cls);
217 if (NULL != n->env)
218 {
219 GNUNET_MQ_send_cancel (n->env);
220 n->env = NULL;
221 }
222 GNUNET_MQ_destroy (n->mq);
223 GNUNET_assert (NULL == n->mq);
224 GNUNET_assert (
225 GNUNET_YES ==
226 GNUNET_CONTAINER_multipeermap_remove (handle->neighbours, key, n));
227 GNUNET_free (n);
228 return GNUNET_YES;
229}
230
231
232/**
233 * Generic error handler, called with the appropriate
234 * error code and the same closure specified at the creation of
235 * the message queue.
236 * Not every message queue implementation supports an error handler.
237 *
238 * @param cls closure with the `struct GNUNET_TRANSPORT_CoreHandle *`
239 * @param error error code
240 */
241static void
242mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
243{
244 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
245
246 LOG (GNUNET_ERROR_TYPE_DEBUG,
247 "Error receiving from transport service, disconnecting temporarily.\n");
248 disconnect_and_schedule_reconnect (h);
249}
250
251
252/**
253 * A message from the handler's message queue to a neighbour was
254 * transmitted. Now trigger (possibly delayed) notification of the
255 * neighbour's message queue that we are done and thus ready for
256 * the next message. Note that the MQ being ready is independent
257 * of the send window, as we may queue many messages and simply
258 * not pass them to TRANSPORT if the send window is insufficient.
259 *
260 * @param cls the `struct Neighbour` where the message was sent
261 */
262static void
263notify_send_done (void *cls)
264{
265 struct Neighbour *n = cls;
266
267 n->awaiting_done = GNUNET_NO;
268 n->env = NULL;
269 GNUNET_MQ_impl_send_continue (n->mq);
270}
271
272
273/**
274 * We have an envelope waiting for transmission at @a n, and
275 * our transmission window is positive. Perform the transmission.
276 *
277 * @param n neighbour to perform transmission for
278 */
279static void
280do_send (struct Neighbour *n)
281{
282 GNUNET_assert (0 < n->ready_window);
283 GNUNET_assert (NULL != n->env);
284 n->ready_window--;
285 n->awaiting_done = GNUNET_YES;
286 GNUNET_MQ_notify_sent (n->env, &notify_send_done, n);
287 GNUNET_MQ_send (n->h->mq, n->env);
288 LOG (GNUNET_ERROR_TYPE_DEBUG,
289 "Passed message of type %u for neighbour `%s' to TRANSPORT.\n",
290 ntohs (GNUNET_MQ_env_get_msg (n->env)->type),
291 GNUNET_i2s (&n->id));
292}
293
294
295/**
296 * Implement sending functionality of a message queue.
297 * Called one message at a time. Should send the @a msg
298 * to the transport service and then notify the queue
299 * once we are ready for the next one.
300 *
301 * @param mq the message queue
302 * @param msg the message to send
303 * @param impl_state state of the implementation
304 */
305static void
306mq_send_impl (struct GNUNET_MQ_Handle *mq,
307 const struct GNUNET_MessageHeader *msg,
308 void *impl_state)
309{
310 struct Neighbour *n = impl_state;
311 struct OutboundMessage *obm;
312 uint16_t msize;
313
314 msize = ntohs (msg->size);
315 if (msize >= GNUNET_MAX_MESSAGE_SIZE - sizeof(*obm))
316 {
317 GNUNET_break (0);
318 GNUNET_MQ_impl_send_continue (mq);
319 return;
320 }
321 LOG (GNUNET_ERROR_TYPE_DEBUG,
322 "CORE requested transmission of message of type %u to neighbour `%s'.\n",
323 ntohs (msg->type),
324 GNUNET_i2s (&n->id));
325
326 GNUNET_assert (NULL == n->env);
327 n->env =
328 GNUNET_MQ_msg_nested_mh (obm, GNUNET_MESSAGE_TYPE_TRANSPORT_SEND, msg);
329 n->env_size = ntohs (msg->size);
330 {
331 struct GNUNET_MQ_Envelope *env;
332
333 env = GNUNET_MQ_get_current_envelope (mq);
334 obm->priority = htonl ((uint32_t) GNUNET_MQ_env_get_options (env));
335 }
336 obm->peer = n->id;
337 if (0 == n->ready_window)
338 {
339 LOG (GNUNET_ERROR_TYPE_DEBUG,
340 "Flow control delays transmission to CORE until we see SEND_OK.\n");
341 return; /* can't send yet, need to wait for SEND_OK */
342 }
343 do_send (n);
344}
345
346
347/**
348 * Handle destruction of a message queue. Implementations must not
349 * free @a mq, but should take care of @a impl_state.
350 *
351 * @param mq the message queue to destroy
352 * @param impl_state state of the implementation
353 */
354static void
355mq_destroy_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
356{
357 struct Neighbour *n = impl_state;
358
359 GNUNET_assert (mq == n->mq);
360 n->mq = NULL;
361}
362
363
364/**
365 * Implementation function that cancels the currently sent message.
366 * Should basically undo whatever #mq_send_impl() did.
367 *
368 * @param mq message queue
369 * @param impl_state state specific to the implementation
370 */
371static void
372mq_cancel_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
373{
374 struct Neighbour *n = impl_state;
375
376 n->ready_window++;
377 if (GNUNET_YES == n->awaiting_done)
378 {
379 GNUNET_MQ_send_cancel (n->env);
380 n->env = NULL;
381 n->awaiting_done = GNUNET_NO;
382 }
383 else
384 {
385 GNUNET_assert (0 == n->ready_window);
386 n->env = NULL;
387 }
388}
389
390
391/**
392 * We had an error processing a message we forwarded from a peer to
393 * the CORE service. We should just complain about it but otherwise
394 * continue processing.
395 *
396 * @param cls closure
397 * @param error error code
398 */
399static void
400peer_mq_error_handler (void *cls, enum GNUNET_MQ_Error error)
401{
402 /* struct Neighbour *n = cls; */
403
404 GNUNET_break_op (0);
405}
406
407
408/**
409 * Function we use for handling incoming connect messages.
410 *
411 * @param cls closure, a `struct GNUNET_TRANSPORT_Handle *`
412 * @param cim message received
413 */
414static void
415handle_connect (void *cls, const struct ConnectInfoMessage *cim)
416{
417 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
418 struct Neighbour *n;
419
420 LOG (GNUNET_ERROR_TYPE_DEBUG,
421 "Receiving CONNECT message for `%s'\n",
422 GNUNET_i2s (&cim->id));
423 n = neighbour_find (h, &cim->id);
424 if (NULL != n)
425 {
426 GNUNET_break (0);
427 disconnect_and_schedule_reconnect (h);
428 return;
429 }
430 n = GNUNET_new (struct Neighbour);
431 n->id = cim->id;
432 n->h = h;
433 n->ready_window = SEND_WINDOW_SIZE;
434 GNUNET_assert (GNUNET_OK ==
435 GNUNET_CONTAINER_multipeermap_put (
436 h->neighbours,
437 &n->id,
438 n,
439 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
440
441 n->mq = GNUNET_MQ_queue_for_callbacks (&mq_send_impl,
442 &mq_destroy_impl,
443 &mq_cancel_impl,
444 n,
445 h->handlers,
446 &peer_mq_error_handler,
447 n);
448 if (NULL != h->nc_cb)
449 {
450 n->handlers_cls = h->nc_cb (h->cls, &n->id, n->mq);
451 GNUNET_MQ_set_handlers_closure (n->mq, n->handlers_cls);
452 }
453}
454
455
456/**
457 * Function we use for handling incoming disconnect messages.
458 *
459 * @param cls closure, a `struct GNUNET_TRANSPORT_CoreHandle *`
460 * @param dim message received
461 */
462static void
463handle_disconnect (void *cls, const struct DisconnectInfoMessage *dim)
464{
465 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
466 struct Neighbour *n;
467
468 GNUNET_break (ntohl (dim->reserved) == 0);
469 LOG (GNUNET_ERROR_TYPE_DEBUG,
470 "Receiving DISCONNECT message for `%s'.\n",
471 GNUNET_i2s (&dim->peer));
472 n = neighbour_find (h, &dim->peer);
473 if (NULL == n)
474 {
475 GNUNET_break (0);
476 disconnect_and_schedule_reconnect (h);
477 return;
478 }
479 GNUNET_assert (GNUNET_YES == neighbour_delete (h, &dim->peer, n));
480}
481
482
483/**
484 * Function we use for handling incoming send-ok messages.
485 *
486 * @param cls closure, a `struct GNUNET_TRANSPORT_CoreHandle *`
487 * @param okm message received
488 */
489static void
490handle_send_ok (void *cls, const struct SendOkMessage *okm)
491{
492 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
493 struct Neighbour *n;
494
495 LOG (GNUNET_ERROR_TYPE_DEBUG,
496 "Receiving SEND_OK message for transmission to %s\n",
497 GNUNET_i2s (&okm->peer));
498 n = neighbour_find (h, &okm->peer);
499 if (NULL == n)
500 {
501 /* We should never get a 'SEND_OK' for a peer that we are not
502 connected to */
503 GNUNET_break (0);
504 disconnect_and_schedule_reconnect (h);
505 return;
506 }
507 n->ready_window++;
508 if ((NULL != n->env) && (1 == n->ready_window))
509 do_send (n);
510}
511
512
513/**
514 * Function we use for checking incoming "inbound" messages.
515 *
516 * @param cls closure, a `struct GNUNET_TRANSPORT_CoreHandle *`
517 * @param im message received
518 */
519static int
520check_recv (void *cls, const struct InboundMessage *im)
521{
522 const struct GNUNET_MessageHeader *imm;
523 uint16_t size;
524
525 size = ntohs (im->header.size) - sizeof(*im);
526 if (size < sizeof(struct GNUNET_MessageHeader))
527 {
528 GNUNET_break (0);
529 return GNUNET_SYSERR;
530 }
531 imm = (const struct GNUNET_MessageHeader *) &im[1];
532 if (ntohs (imm->size) != size)
533 {
534 GNUNET_break (0);
535 return GNUNET_SYSERR;
536 }
537 return GNUNET_OK;
538}
539
540
541/**
542 * Function we use for handling incoming messages.
543 *
544 * @param cls closure, a `struct GNUNET_TRANSPORT_CoreHandle *`
545 * @param im message received
546 */
547static void
548handle_recv (void *cls, const struct InboundMessage *im)
549{
550 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
551 const struct GNUNET_MessageHeader *imm =
552 (const struct GNUNET_MessageHeader *) &im[1];
553 struct Neighbour *n;
554
555 LOG (GNUNET_ERROR_TYPE_DEBUG,
556 "Received message of type %u with %u bytes from `%s'.\n",
557 (unsigned int) ntohs (imm->type),
558 (unsigned int) ntohs (imm->size),
559 GNUNET_i2s (&im->peer));
560 n = neighbour_find (h, &im->peer);
561 if (NULL == n)
562 {
563 GNUNET_break (0);
564 disconnect_and_schedule_reconnect (h);
565 return;
566 }
567 GNUNET_MQ_inject_message (n->mq, imm);
568}
569
570
571/**
572 * Try again to connect to transport service.
573 *
574 * @param cls the handle to the transport service
575 */
576static void
577reconnect (void *cls)
578{
579 struct GNUNET_TRANSPORT_CoreHandle *h = cls;
580 struct GNUNET_MQ_MessageHandler handlers[] =
581 { GNUNET_MQ_hd_fixed_size (connect,
582 GNUNET_MESSAGE_TYPE_TRANSPORT_CONNECT,
583 struct ConnectInfoMessage,
584 h),
585 GNUNET_MQ_hd_fixed_size (disconnect,
586 GNUNET_MESSAGE_TYPE_TRANSPORT_DISCONNECT,
587 struct DisconnectInfoMessage,
588 h),
589 GNUNET_MQ_hd_fixed_size (send_ok,
590 GNUNET_MESSAGE_TYPE_TRANSPORT_SEND_OK,
591 struct SendOkMessage,
592 h),
593 GNUNET_MQ_hd_var_size (recv,
594 GNUNET_MESSAGE_TYPE_TRANSPORT_RECV,
595 struct InboundMessage,
596 h),
597 GNUNET_MQ_handler_end () };
598 struct GNUNET_MQ_Envelope *env;
599 struct StartMessage *s;
600 uint32_t options;
601
602 h->reconnect_task = NULL;
603 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service.\n");
604 GNUNET_assert (NULL == h->mq);
605 h->mq =
606 GNUNET_CLIENT_connect (h->cfg, "transport", handlers, &mq_error_handler, h);
607 if (NULL == h->mq)
608 return;
609 env = GNUNET_MQ_msg (s, GNUNET_MESSAGE_TYPE_TRANSPORT_START);
610 options = 0;
611 if (h->check_self)
612 options |= 1;
613 if (NULL != h->handlers)
614 options |= 2;
615 s->options = htonl (options);
616 s->self = h->self;
617 GNUNET_MQ_send (h->mq, env);
618}
619
620
621/**
622 * Disconnect from the transport service.
623 *
624 * @param h transport service to reconnect
625 */
626static void
627disconnect (struct GNUNET_TRANSPORT_CoreHandle *h)
628{
629 GNUNET_CONTAINER_multipeermap_iterate (h->neighbours, &neighbour_delete, h);
630 if (NULL != h->mq)
631 {
632 GNUNET_MQ_destroy (h->mq);
633 h->mq = NULL;
634 }
635}
636
637
638/**
639 * Function that will schedule the job that will try
640 * to connect us again to the client.
641 *
642 * @param h transport service to reconnect
643 */
644static void
645disconnect_and_schedule_reconnect (struct GNUNET_TRANSPORT_CoreHandle *h)
646{
647 GNUNET_assert (NULL == h->reconnect_task);
648 disconnect (h);
649 LOG (GNUNET_ERROR_TYPE_DEBUG,
650 "Scheduling task to reconnect to transport service in %s.\n",
651 GNUNET_STRINGS_relative_time_to_string (h->reconnect_delay, GNUNET_YES));
652 h->reconnect_task =
653 GNUNET_SCHEDULER_add_delayed (h->reconnect_delay, &reconnect, h);
654 h->reconnect_delay = GNUNET_TIME_STD_BACKOFF (h->reconnect_delay);
655}
656
657
658/**
659 * Checks if a given peer is connected to us and get the message queue.
660 *
661 * @param handle connection to transport service
662 * @param peer the peer to check
663 * @return NULL if disconnected, otherwise message queue for @a peer
664 */
665struct GNUNET_MQ_Handle *
666GNUNET_TRANSPORT_core_get_mq (struct GNUNET_TRANSPORT_CoreHandle *handle,
667 const struct GNUNET_PeerIdentity *peer)
668{
669 struct Neighbour *n;
670
671 n = neighbour_find (handle, peer);
672 if (NULL == n)
673 return NULL;
674 return n->mq;
675}
676
677
678/**
679 * Notification from the CORE service to the TRANSPORT service
680 * that the CORE service has finished processing a message from
681 * TRANSPORT (via the @code{handlers} of #GNUNET_TRANSPORT_core_connect())
682 * and that it is thus now OK for TRANSPORT to send more messages
683 * for @a pid.
684 *
685 * Used to provide flow control, this is our equivalent to
686 * #GNUNET_SERVICE_client_continue() of an ordinary service.
687 *
688 * Note that due to the use of a window, TRANSPORT may send multiple
689 * messages destined for the same peer even without an intermediate
690 * call to this function. However, CORE must still call this function
691 * once per message received, as otherwise eventually the window will
692 * be full and TRANSPORT will stop providing messages to CORE for @a
693 * pid.
694 *
695 * @param ch core handle
696 * @param pid which peer was the message from that was fully processed by CORE
697 */
698void
699GNUNET_TRANSPORT_core_receive_continue (struct GNUNET_TRANSPORT_CoreHandle *ch,
700 const struct GNUNET_PeerIdentity *pid)
701{
702 struct GNUNET_MQ_Envelope *env;
703 struct RecvOkMessage *rok;
704
705 LOG (GNUNET_ERROR_TYPE_DEBUG,
706 "Message for %s finished CORE processing, sending RECV_OK.\n",
707 GNUNET_i2s (pid));
708 if (NULL == ch->mq)
709 return;
710 env = GNUNET_MQ_msg (rok, GNUNET_MESSAGE_TYPE_TRANSPORT_RECV_OK);
711 rok->increase_window_delta = htonl (1);
712 rok->peer = *pid;
713 GNUNET_MQ_send (ch->mq, env);
714}
715
716
717/**
718 * Connect to the transport service. Note that the connection may
719 * complete (or fail) asynchronously.
720 *
721 * @param cfg configuration to use
722 * @param self our own identity (API should check that it matches
723 * the identity found by transport), or NULL (no check)
724 * @param cls closure for the callbacks
725 * @param rec receive function to call
726 * @param nc function to call on connect events
727 * @param nd function to call on disconnect events
728 * @return NULL on error
729 */
730struct GNUNET_TRANSPORT_CoreHandle *
731GNUNET_TRANSPORT_core_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
732 const struct GNUNET_PeerIdentity *self,
733 const struct GNUNET_MQ_MessageHandler *handlers,
734 void *cls,
735 GNUNET_TRANSPORT_NotifyConnect nc,
736 GNUNET_TRANSPORT_NotifyDisconnect nd)
737{
738 struct GNUNET_TRANSPORT_CoreHandle *h;
739 unsigned int i;
740
741 h = GNUNET_new (struct GNUNET_TRANSPORT_CoreHandle);
742 if (NULL != self)
743 {
744 h->self = *self;
745 h->check_self = GNUNET_YES;
746 }
747 h->cfg = cfg;
748 h->cls = cls;
749 h->nc_cb = nc;
750 h->nd_cb = nd;
751 h->reconnect_delay = GNUNET_TIME_UNIT_ZERO;
752 if (NULL != handlers)
753 {
754 for (i = 0; NULL != handlers[i].cb; i++)
755 ;
756 h->handlers = GNUNET_new_array (i + 1, struct GNUNET_MQ_MessageHandler);
757 GNUNET_memcpy (h->handlers,
758 handlers,
759 i * sizeof(struct GNUNET_MQ_MessageHandler));
760 }
761 LOG (GNUNET_ERROR_TYPE_DEBUG, "Connecting to transport service\n");
762 reconnect (h);
763 if (NULL == h->mq)
764 {
765 GNUNET_free (h->handlers);
766 GNUNET_free (h);
767 return NULL;
768 }
769 h->neighbours =
770 GNUNET_CONTAINER_multipeermap_create (STARTING_NEIGHBOURS_SIZE, GNUNET_YES);
771 return h;
772}
773
774
775/**
776 * Disconnect from the transport service.
777 *
778 * @param handle handle to the service as returned from
779 * #GNUNET_TRANSPORT_core_connect()
780 */
781void
782GNUNET_TRANSPORT_core_disconnect (struct GNUNET_TRANSPORT_CoreHandle *handle)
783{
784 LOG (GNUNET_ERROR_TYPE_DEBUG, "Transport disconnect called!\n");
785 /* this disconnects all neighbours... */
786 disconnect (handle);
787 /* and now we stop trying to connect again... */
788 if (NULL != handle->reconnect_task)
789 {
790 GNUNET_SCHEDULER_cancel (handle->reconnect_task);
791 handle->reconnect_task = NULL;
792 }
793 GNUNET_CONTAINER_multipeermap_destroy (handle->neighbours);
794 handle->neighbours = NULL;
795 GNUNET_free (handle->handlers);
796 handle->handlers = NULL;
797 GNUNET_free (handle);
798}
799
800
801/* end of transport_api_core.c */
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 03:51:41 +0000