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1/*
2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
4 GNUnet is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published
6 by the Free Software Foundation; either version 3, or (at your
7 option) any later version.
8 GNUnet is distributed in the hope that it will be useful, but
9 WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 General Public License for more details.
12 You should have received a copy of the GNU General Public License
13 along with GNUnet; see the file COPYING. If not, write to the
14 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
15 Boston, MA 02111-1307, USA.
16*/
17
18/**
19 * @file cadet/cadet_api.c
20 * @brief cadet api: client implementation of new cadet service
21 * @author Bartlomiej Polot
22 */
23
24#include "platform.h"
25#include "gnunet_util_lib.h"
26#include "gnunet_cadet_service.h"
27#include "cadet.h"
28#include "cadet_protocol.h"
29
30#define LOG(kind,...) GNUNET_log_from (kind, "cadet-api",__VA_ARGS__)
31
32/******************************************************************************/
33/************************ DATA STRUCTURES ****************************/
34/******************************************************************************/
35
36/**
37 * Transmission queue to the service
38 */
39struct GNUNET_CADET_TransmitHandle
40{
41
42 /**
43 * Double Linked list
44 */
45 struct GNUNET_CADET_TransmitHandle *next;
46
47 /**
48 * Double Linked list
49 */
50 struct GNUNET_CADET_TransmitHandle *prev;
51
52 /**
53 * Channel this message is sent on / for (may be NULL for control messages).
54 */
55 struct GNUNET_CADET_Channel *channel;
56
57 /**
58 * Callback to obtain the message to transmit, or NULL if we
59 * got the message in 'data'. Notice that messages built
60 * by 'notify' need to be encapsulated with information about
61 * the 'target'.
62 */
63 GNUNET_CONNECTION_TransmitReadyNotify notify;
64
65 /**
66 * Closure for 'notify'
67 */
68 void *notify_cls;
69
70 /**
71 * How long is this message valid. Once the timeout has been
72 * reached, the message must no longer be sent. If this
73 * is a message with a 'notify' callback set, the 'notify'
74 * function should be called with 'buf' NULL and size 0.
75 */
76 struct GNUNET_TIME_Absolute timeout;
77
78 /**
79 * Task triggering a timeout, can be NO_TASK if the timeout is FOREVER.
80 */
81 GNUNET_SCHEDULER_TaskIdentifier timeout_task;
82
83 /**
84 * Size of 'data' -- or the desired size of 'notify' if 'data' is NULL.
85 */
86 size_t size;
87};
88
89union CadetInfoCB {
90
91 /**
92 * Channel callback.
93 */
94 GNUNET_CADET_ChannelCB channel_cb;
95
96 /**
97 * Monitor callback
98 */
99 GNUNET_CADET_PeersCB peers_cb;
100
101 /**
102 * Monitor callback
103 */
104 GNUNET_CADET_PeerCB peer_cb;
105
106 /**
107 * Monitor callback
108 */
109 GNUNET_CADET_TunnelsCB tunnels_cb;
110
111 /**
112 * Tunnel callback.
113 */
114 GNUNET_CADET_TunnelCB tunnel_cb;
115};
116
117
118/**
119 * Opaque handle to the service.
120 */
121struct GNUNET_CADET_Handle
122{
123
124 /**
125 * Handle to the server connection, to send messages later
126 */
127 struct GNUNET_CLIENT_Connection *client;
128
129 /**
130 * Set of handlers used for processing incoming messages in the channels
131 */
132 const struct GNUNET_CADET_MessageHandler *message_handlers;
133
134 /**
135 * Number of handlers in the handlers array.
136 */
137 unsigned int n_handlers;
138
139 /**
140 * Ports open.
141 */
142 const uint32_t *ports;
143
144 /**
145 * Number of ports.
146 */
147 unsigned int n_ports;
148
149 /**
150 * Double linked list of the channels this client is connected to, head.
151 */
152 struct GNUNET_CADET_Channel *channels_head;
153
154 /**
155 * Double linked list of the channels this client is connected to, tail.
156 */
157 struct GNUNET_CADET_Channel *channels_tail;
158
159 /**
160 * Callback for inbound channel creation
161 */
162 GNUNET_CADET_InboundChannelNotificationHandler *new_channel;
163
164 /**
165 * Callback for inbound channel disconnection
166 */
167 GNUNET_CADET_ChannelEndHandler *cleaner;
168
169 /**
170 * Handle to cancel pending transmissions in case of disconnection
171 */
172 struct GNUNET_CLIENT_TransmitHandle *th;
173
174 /**
175 * Closure for all the handlers given by the client
176 */
177 void *cls;
178
179 /**
180 * Messages to send to the service, head.
181 */
182 struct GNUNET_CADET_TransmitHandle *th_head;
183
184 /**
185 * Messages to send to the service, tail.
186 */
187 struct GNUNET_CADET_TransmitHandle *th_tail;
188
189 /**
190 * chid of the next channel to create (to avoid reusing IDs often)
191 */
192 CADET_ChannelNumber next_chid;
193
194 /**
195 * Have we started the task to receive messages from the service
196 * yet? We do this after we send the 'CADET_LOCAL_CONNECT' message.
197 */
198 int in_receive;
199
200 /**
201 * Configuration given by the client, in case of reconnection
202 */
203 const struct GNUNET_CONFIGURATION_Handle *cfg;
204
205 /**
206 * Time to the next reconnect in case one reconnect fails
207 */
208 struct GNUNET_TIME_Relative reconnect_time;
209
210 /**
211 * Task for trying to reconnect.
212 */
213 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
214
215 /**
216 * Callback for an info task (only one active at a time).
217 */
218 union CadetInfoCB info_cb;
219
220 /**
221 * Info callback closure for @c info_cb.
222 */
223 void *info_cls;
224};
225
226
227/**
228 * Description of a peer
229 */
230struct GNUNET_CADET_Peer
231{
232 /**
233 * ID of the peer in short form
234 */
235 GNUNET_PEER_Id id;
236
237 /**
238 * Channel this peer belongs to
239 */
240 struct GNUNET_CADET_Channel *t;
241};
242
243
244/**
245 * Opaque handle to a channel.
246 */
247struct GNUNET_CADET_Channel
248{
249
250 /**
251 * DLL next
252 */
253 struct GNUNET_CADET_Channel *next;
254
255 /**
256 * DLL prev
257 */
258 struct GNUNET_CADET_Channel *prev;
259
260 /**
261 * Handle to the cadet this channel belongs to
262 */
263 struct GNUNET_CADET_Handle *cadet;
264
265 /**
266 * Local ID of the channel
267 */
268 CADET_ChannelNumber chid;
269
270 /**
271 * Port number.
272 */
273 uint32_t port;
274
275 /**
276 * Other end of the channel.
277 */
278 GNUNET_PEER_Id peer;
279
280 /**
281 * Any data the caller wants to put in here
282 */
283 void *ctx;
284
285 /**
286 * Size of packet queued in this channel
287 */
288 unsigned int packet_size;
289
290 /**
291 * Channel options: reliability, etc.
292 */
293 enum GNUNET_CADET_ChannelOption options;
294
295 /**
296 * Are we allowed to send to the service?
297 */
298 int allow_send;
299
300};
301
302
303/**
304 * Implementation state for cadet's message queue.
305 */
306struct CadetMQState
307{
308 /**
309 * The current transmit handle, or NULL
310 * if no transmit is active.
311 */
312 struct GNUNET_CADET_TransmitHandle *th;
313
314 /**
315 * Channel to send the data over.
316 */
317 struct GNUNET_CADET_Channel *channel;
318};
319
320
321/******************************************************************************/
322/*********************** DECLARATIONS *************************/
323/******************************************************************************/
324
325/**
326 * Function called to send a message to the service.
327 * "buf" will be NULL and "size" zero if the socket was closed for writing in
328 * the meantime.
329 *
330 * @param cls closure, the cadet handle
331 * @param size number of bytes available in buf
332 * @param buf where the callee should write the connect message
333 * @return number of bytes written to buf
334 */
335static size_t
336send_callback (void *cls, size_t size, void *buf);
337
338
339/******************************************************************************/
340/*********************** AUXILIARY FUNCTIONS *************************/
341/******************************************************************************/
342
343/**
344 * Check if transmission is a payload packet.
345 *
346 * @param th Transmission handle.
347 *
348 * @return GNUNET_YES if it is a payload packet,
349 * GNUNET_NO if it is a cadet management packet.
350 */
351static int
352th_is_payload (struct GNUNET_CADET_TransmitHandle *th)
353{
354 return (th->notify != NULL) ? GNUNET_YES : GNUNET_NO;
355}
356
357
358/**
359 * Check whether there is any message ready in the queue and find the size.
360 *
361 * @param h Cadet handle.
362 *
363 * @return The size of the first ready message in the queue,
364 * 0 if there is none.
365 */
366static size_t
367message_ready_size (struct GNUNET_CADET_Handle *h)
368{
369 struct GNUNET_CADET_TransmitHandle *th;
370 struct GNUNET_CADET_Channel *ch;
371
372 for (th = h->th_head; NULL != th; th = th->next)
373 {
374 ch = th->channel;
375 if (GNUNET_NO == th_is_payload (th))
376 {
377 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message internal\n");
378 return th->size;
379 }
380 if (GNUNET_YES == ch->allow_send)
381 {
382 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message payload ok\n");
383 return th->size;
384 }
385 }
386 return 0;
387}
388
389
390/**
391 * Get the channel handler for the channel specified by id from the given handle
392 * @param h Cadet handle
393 * @param chid ID of the wanted channel
394 * @return handle to the required channel or NULL if not found
395 */
396static struct GNUNET_CADET_Channel *
397retrieve_channel (struct GNUNET_CADET_Handle *h, CADET_ChannelNumber chid)
398{
399 struct GNUNET_CADET_Channel *ch;
400
401 ch = h->channels_head;
402 while (ch != NULL)
403 {
404 if (ch->chid == chid)
405 return ch;
406 ch = ch->next;
407 }
408 return NULL;
409}
410
411
412/**
413 * Create a new channel and insert it in the channel list of the cadet handle
414 *
415 * @param h Cadet handle
416 * @param chid Desired chid of the channel, 0 to assign one automatically.
417 *
418 * @return Handle to the created channel.
419 */
420static struct GNUNET_CADET_Channel *
421create_channel (struct GNUNET_CADET_Handle *h, CADET_ChannelNumber chid)
422{
423 struct GNUNET_CADET_Channel *ch;
424
425 ch = GNUNET_new (struct GNUNET_CADET_Channel);
426 GNUNET_CONTAINER_DLL_insert (h->channels_head, h->channels_tail, ch);
427 ch->cadet = h;
428 if (0 == chid)
429 {
430 ch->chid = h->next_chid;
431 while (NULL != retrieve_channel (h, h->next_chid))
432 {
433 h->next_chid++;
434 h->next_chid &= ~GNUNET_CADET_LOCAL_CHANNEL_ID_SERV;
435 h->next_chid |= GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
436 }
437 }
438 else
439 {
440 ch->chid = chid;
441 }
442 ch->allow_send = GNUNET_NO;
443 return ch;
444}
445
446
447/**
448 * Destroy the specified channel.
449 * - Destroys all peers, calling the disconnect callback on each if needed
450 * - Cancels all outgoing traffic for that channel, calling respective notifys
451 * - Calls cleaner if channel was inbound
452 * - Frees all memory used
453 *
454 * @param ch Pointer to the channel.
455 * @param call_cleaner Whether to call the cleaner handler.
456 *
457 * @return Handle to the required channel or NULL if not found.
458 */
459static void
460destroy_channel (struct GNUNET_CADET_Channel *ch, int call_cleaner)
461{
462 struct GNUNET_CADET_Handle *h;
463 struct GNUNET_CADET_TransmitHandle *th;
464 struct GNUNET_CADET_TransmitHandle *next;
465
466 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroy_channel %X\n", ch->chid);
467
468 if (NULL == ch)
469 {
470 GNUNET_break (0);
471 return;
472 }
473 h = ch->cadet;
474
475 GNUNET_CONTAINER_DLL_remove (h->channels_head, h->channels_tail, ch);
476
477 /* signal channel destruction */
478 if ( (NULL != h->cleaner) && (0 != ch->peer) && (GNUNET_YES == call_cleaner) )
479 {
480 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling cleaner\n");
481 h->cleaner (h->cls, ch, ch->ctx);
482 }
483
484 /* check that clients did not leave messages behind in the queue */
485 for (th = h->th_head; NULL != th; th = next)
486 {
487 next = th->next;
488 if (th->channel != ch)
489 continue;
490 /* Clients should have aborted their requests already.
491 * Management traffic should be ok, as clients can't cancel that.
492 * If the service crashed and we are reconnecting, it's ok.
493 */
494 GNUNET_break (GNUNET_NO == th_is_payload (th)
495 || GNUNET_NO == h->in_receive);
496 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
497
498 /* clean up request */
499 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
500 GNUNET_SCHEDULER_cancel (th->timeout_task);
501 GNUNET_free (th);
502 }
503
504 /* if there are no more pending requests with cadet service, cancel active request */
505 /* Note: this should be unnecessary... */
506 if ((0 == message_ready_size (h)) && (NULL != h->th))
507 {
508 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
509 h->th = NULL;
510 }
511
512 if (0 != ch->peer)
513 GNUNET_PEER_change_rc (ch->peer, -1);
514 GNUNET_free (ch);
515 return;
516}
517
518
519/**
520 * Notify client that the transmission has timed out
521 *
522 * @param cls closure
523 * @param tc task context
524 */
525static void
526timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
527{
528 struct GNUNET_CADET_TransmitHandle *th = cls;
529 struct GNUNET_CADET_Handle *cadet;
530
531 cadet = th->channel->cadet;
532 GNUNET_CONTAINER_DLL_remove (cadet->th_head, cadet->th_tail, th);
533 th->channel->packet_size = 0;
534 if (GNUNET_YES == th_is_payload (th))
535 th->notify (th->notify_cls, 0, NULL);
536 GNUNET_free (th);
537 if ((0 == message_ready_size (cadet)) && (NULL != cadet->th))
538 {
539 /* nothing ready to transmit, no point in asking for transmission */
540 GNUNET_CLIENT_notify_transmit_ready_cancel (cadet->th);
541 cadet->th = NULL;
542 }
543}
544
545
546/**
547 * Add a transmit handle to the transmission queue and set the
548 * timeout if needed.
549 *
550 * @param h cadet handle with the queue head and tail
551 * @param th handle to the packet to be transmitted
552 */
553static void
554add_to_queue (struct GNUNET_CADET_Handle *h,
555 struct GNUNET_CADET_TransmitHandle *th)
556{
557 GNUNET_CONTAINER_DLL_insert_tail (h->th_head, h->th_tail, th);
558 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == th->timeout.abs_value_us)
559 return;
560 th->timeout_task =
561 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
562 (th->timeout), &timeout_transmission, th);
563}
564
565
566/**
567 * Auxiliary function to send an already constructed packet to the service.
568 * Takes care of creating a new queue element, copying the message and
569 * calling the tmt_rdy function if necessary.
570 *
571 * @param h cadet handle
572 * @param msg message to transmit
573 * @param channel channel this send is related to (NULL if N/A)
574 */
575static void
576send_packet (struct GNUNET_CADET_Handle *h,
577 const struct GNUNET_MessageHeader *msg,
578 struct GNUNET_CADET_Channel *channel);
579
580
581/**
582 * Send an ack on the channel to confirm the processing of a message.
583 *
584 * @param ch Channel on which to send the ACK.
585 */
586static void
587send_ack (struct GNUNET_CADET_Channel *ch)
588{
589 struct GNUNET_CADET_LocalAck msg;
590
591 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK on channel %X\n", ch->chid);
592 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK);
593 msg.header.size = htons (sizeof (msg));
594 msg.channel_id = htonl (ch->chid);
595
596 send_packet (ch->cadet, &msg.header, ch);
597 return;
598}
599
600
601
602/**
603 * Reconnect callback: tries to reconnect again after a failer previous
604 * reconnecttion
605 * @param cls closure (cadet handle)
606 * @param tc task context
607 */
608static void
609reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
610
611
612/**
613 * Send a connect packet to the service with the applications and types
614 * requested by the user.
615 *
616 * @param h The cadet handle.
617 *
618 */
619static void
620send_connect (struct GNUNET_CADET_Handle *h)
621{
622 size_t size;
623
624 size = sizeof (struct GNUNET_CADET_ClientConnect);
625 size += h->n_ports * sizeof (uint32_t);
626 {
627 char buf[size] GNUNET_ALIGN;
628 struct GNUNET_CADET_ClientConnect *msg;
629 uint32_t *ports;
630 uint16_t i;
631
632 /* build connection packet */
633 msg = (struct GNUNET_CADET_ClientConnect *) buf;
634 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_CONNECT);
635 msg->header.size = htons (size);
636 ports = (uint32_t *) &msg[1];
637 for (i = 0; i < h->n_ports; i++)
638 {
639 ports[i] = htonl (h->ports[i]);
640 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n",
641 h->ports[i]);
642 }
643 LOG (GNUNET_ERROR_TYPE_DEBUG,
644 "Sending %lu bytes long message with %u ports\n",
645 ntohs (msg->header.size), h->n_ports);
646 send_packet (h, &msg->header, NULL);
647 }
648}
649
650
651/**
652 * Reconnect to the service, retransmit all infomation to try to restore the
653 * original state.
654 *
655 * @param h handle to the cadet
656 *
657 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
658 */
659static int
660do_reconnect (struct GNUNET_CADET_Handle *h)
661{
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
663 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
664 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
665 LOG (GNUNET_ERROR_TYPE_DEBUG, "******** on %p *******\n", h);
666 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
667
668 /* disconnect */
669 if (NULL != h->th)
670 {
671 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
672 h->th = NULL;
673 }
674 if (NULL != h->client)
675 {
676 GNUNET_CLIENT_disconnect (h->client);
677 }
678
679 /* connect again */
680 h->client = GNUNET_CLIENT_connect ("cadet", h->cfg);
681 if (h->client == NULL)
682 {
683 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
684 &reconnect_cbk, h);
685 h->reconnect_time =
686 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
687 GNUNET_TIME_relative_multiply
688 (h->reconnect_time, 2));
689 LOG (GNUNET_ERROR_TYPE_DEBUG, "Next retry in %s\n",
690 GNUNET_STRINGS_relative_time_to_string (h->reconnect_time,
691 GNUNET_NO));
692 GNUNET_break (0);
693 return GNUNET_NO;
694 }
695 else
696 {
697 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
698 }
699 send_connect (h);
700 return GNUNET_YES;
701}
702
703/**
704 * Reconnect callback: tries to reconnect again after a failer previous
705 * reconnecttion
706 * @param cls closure (cadet handle)
707 * @param tc task context
708 */
709static void
710reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
711{
712 struct GNUNET_CADET_Handle *h = cls;
713
714 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
715 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
716 return;
717 do_reconnect (h);
718}
719
720
721/**
722 * Reconnect to the service, retransmit all infomation to try to restore the
723 * original state.
724 *
725 * @param h handle to the cadet
726 *
727 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
728 */
729static void
730reconnect (struct GNUNET_CADET_Handle *h)
731{
732 struct GNUNET_CADET_Channel *ch;
733 struct GNUNET_CADET_Channel *next;
734
735 LOG (GNUNET_ERROR_TYPE_DEBUG,
736 "Requested RECONNECT, destroying all channels\n");
737 h->in_receive = GNUNET_NO;
738 for (ch = h->channels_head; NULL != ch; ch = next)
739 {
740 next = ch->next;
741 destroy_channel (ch, GNUNET_YES);
742 }
743 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
744 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
745 &reconnect_cbk, h);
746}
747
748
749/******************************************************************************/
750/*********************** RECEIVE HANDLERS ****************************/
751/******************************************************************************/
752
753/**
754 * Process the new channel notification and add it to the channels in the handle
755 *
756 * @param h The cadet handle
757 * @param msg A message with the details of the new incoming channel
758 */
759static void
760process_channel_created (struct GNUNET_CADET_Handle *h,
761 const struct GNUNET_CADET_ChannelMessage *msg)
762{
763 struct GNUNET_CADET_Channel *ch;
764 CADET_ChannelNumber chid;
765 uint32_t port;
766
767 chid = ntohl (msg->channel_id);
768 port = ntohl (msg->port);
769 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating incoming channel %X:%u\n", chid, port);
770 if (chid < GNUNET_CADET_LOCAL_CHANNEL_ID_SERV)
771 {
772 GNUNET_break (0);
773 return;
774 }
775 if (NULL != h->new_channel)
776 {
777 void *ctx;
778
779 ch = create_channel (h, chid);
780 ch->allow_send = GNUNET_NO;
781 ch->peer = GNUNET_PEER_intern (&msg->peer);
782 ch->cadet = h;
783 ch->chid = chid;
784 ch->port = port;
785 ch->options = ntohl (msg->opt);
786
787 LOG (GNUNET_ERROR_TYPE_DEBUG, " created channel %p\n", ch);
788 ctx = h->new_channel (h->cls, ch, &msg->peer, ch->port, ch->options);
789 if (NULL != ctx)
790 ch->ctx = ctx;
791 LOG (GNUNET_ERROR_TYPE_DEBUG, "User notified\n");
792 }
793 else
794 {
795 struct GNUNET_CADET_ChannelMessage d_msg;
796
797 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming channels\n");
798
799 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
800 d_msg.header.size = htons (sizeof (struct GNUNET_CADET_ChannelMessage));
801 d_msg.channel_id = msg->channel_id;
802 memset (&d_msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
803 d_msg.port = 0;
804 d_msg.opt = 0;
805
806 send_packet (h, &d_msg.header, NULL);
807 }
808 return;
809}
810
811
812/**
813 * Process the channel destroy notification and free associated resources
814 *
815 * @param h The cadet handle
816 * @param msg A message with the details of the channel being destroyed
817 */
818static void
819process_channel_destroy (struct GNUNET_CADET_Handle *h,
820 const struct GNUNET_CADET_ChannelMessage *msg)
821{
822 struct GNUNET_CADET_Channel *ch;
823 CADET_ChannelNumber chid;
824
825 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel Destroy received from service\n");
826 chid = ntohl (msg->channel_id);
827 ch = retrieve_channel (h, chid);
828
829 if (NULL == ch)
830 {
831 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X unknown\n", chid);
832 return;
833 }
834 LOG (GNUNET_ERROR_TYPE_DEBUG, " destroying channel %X\n", ch->chid);
835 destroy_channel (ch, GNUNET_YES);
836}
837
838
839/**
840 * Process the incoming data packets, call appropriate handlers.
841 *
842 * @param h The cadet handle
843 * @param message A message encapsulating the data
844 */
845static void
846process_incoming_data (struct GNUNET_CADET_Handle *h,
847 const struct GNUNET_MessageHeader *message)
848{
849 const struct GNUNET_MessageHeader *payload;
850 const struct GNUNET_CADET_MessageHandler *handler;
851 struct GNUNET_CADET_LocalData *dmsg;
852 struct GNUNET_CADET_Channel *ch;
853 size_t size;
854 unsigned int i;
855 uint16_t type;
856
857 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n");
858 dmsg = (struct GNUNET_CADET_LocalData *) message;
859 ch = retrieve_channel (h, ntohl (dmsg->id));
860 if (NULL == ch)
861 {
862 GNUNET_break (0);
863 return;
864 }
865
866 payload = (struct GNUNET_MessageHeader *) &dmsg[1];
867 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s data on channel %s [%X]\n",
868 GM_f2s (ch->chid >= GNUNET_CADET_LOCAL_CHANNEL_ID_SERV),
869 GNUNET_i2s (GNUNET_PEER_resolve2 (ch->peer)), ntohl (dmsg->id));
870
871 size = ntohs (message->size);
872 LOG (GNUNET_ERROR_TYPE_DEBUG, " %u bytes\n", size);
873
874 if (NULL == ch)
875 {
876 /* Channel was ignored/destroyed, probably service didn't get it yet */
877 LOG (GNUNET_ERROR_TYPE_DEBUG, " ignored!\n");
878 return;
879 }
880 type = ntohs (payload->type);
881 size = ntohs (payload->size);
882 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload type %s\n", GM_m2s (type));
883 for (i = 0; i < h->n_handlers; i++)
884 {
885 handler = &h->message_handlers[i];
886 LOG (GNUNET_ERROR_TYPE_DEBUG, " checking handler for type %u\n",
887 handler->type);
888 if (handler->type == type)
889 {
890 if (GNUNET_OK !=
891 handler->callback (h->cls, ch, &ch->ctx, payload))
892 {
893 LOG (GNUNET_ERROR_TYPE_DEBUG, "callback caused disconnection\n");
894 GNUNET_CADET_channel_destroy (ch);
895 return;
896 }
897 else
898 {
899 LOG (GNUNET_ERROR_TYPE_DEBUG,
900 "callback completed successfully\n");
901 return;
902 }
903 }
904 }
905}
906
907
908/**
909 * Process a local ACK message, enabling the client to send
910 * more data to the service.
911 *
912 * @param h Cadet handle.
913 * @param message Message itself.
914 */
915static void
916process_ack (struct GNUNET_CADET_Handle *h,
917 const struct GNUNET_MessageHeader *message)
918{
919 struct GNUNET_CADET_LocalAck *msg;
920 struct GNUNET_CADET_Channel *ch;
921 CADET_ChannelNumber chid;
922
923 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK!\n");
924 msg = (struct GNUNET_CADET_LocalAck *) message;
925 chid = ntohl (msg->channel_id);
926 ch = retrieve_channel (h, chid);
927 if (NULL == ch)
928 {
929 LOG (GNUNET_ERROR_TYPE_DEBUG, "ACK on unknown channel %X\n", chid);
930 return;
931 }
932 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X!\n", ch->chid);
933 ch->allow_send = GNUNET_YES;
934 if (NULL == h->th && 0 < ch->packet_size)
935 {
936 LOG (GNUNET_ERROR_TYPE_DEBUG, " tmt rdy was NULL, requesting!\n");
937 h->th = GNUNET_CLIENT_notify_transmit_ready (h->client, ch->packet_size,
938 GNUNET_TIME_UNIT_FOREVER_REL,
939 GNUNET_YES, &send_callback, h);
940 }
941}
942
943
944/*
945 * Process a local reply about info on all channels, pass info to the user.
946 *
947 * @param h Cadet handle.
948 * @param message Message itself.
949 */
950// static void
951// process_get_channels (struct GNUNET_CADET_Handle *h,
952// const struct GNUNET_MessageHeader *message)
953// {
954// struct GNUNET_CADET_LocalInfo *msg;
955//
956// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get Channels messasge received\n");
957//
958// if (NULL == h->channels_cb)
959// {
960// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
961// return;
962// }
963//
964// msg = (struct GNUNET_CADET_LocalInfo *) message;
965// if (ntohs (message->size) !=
966// (sizeof (struct GNUNET_CADET_LocalInfo) +
967// sizeof (struct GNUNET_PeerIdentity)))
968// {
969// GNUNET_break_op (0);
970// GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
971// "Get channels message: size %hu - expected %u\n",
972// ntohs (message->size),
973// sizeof (struct GNUNET_CADET_LocalInfo));
974// return;
975// }
976// h->channels_cb (h->channels_cls,
977// ntohl (msg->channel_id),
978// &msg->owner,
979// &msg->destination);
980// }
981
982
983
984/*
985 * Process a local monitor_channel reply, pass info to the user.
986 *
987 * @param h Cadet handle.
988 * @param message Message itself.
989 */
990// static void
991// process_show_channel (struct GNUNET_CADET_Handle *h,
992// const struct GNUNET_MessageHeader *message)
993// {
994// struct GNUNET_CADET_LocalInfo *msg;
995// size_t esize;
996//
997// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show Channel messasge received\n");
998//
999// if (NULL == h->channel_cb)
1000// {
1001// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
1002// return;
1003// }
1004//
1005// /* Verify message sanity */
1006// msg = (struct GNUNET_CADET_LocalInfo *) message;
1007// esize = sizeof (struct GNUNET_CADET_LocalInfo);
1008// if (ntohs (message->size) != esize)
1009// {
1010// GNUNET_break_op (0);
1011// GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1012// "Show channel message: size %hu - expected %u\n",
1013// ntohs (message->size),
1014// esize);
1015//
1016// h->channel_cb (h->channel_cls, NULL, NULL);
1017// h->channel_cb = NULL;
1018// h->channel_cls = NULL;
1019//
1020// return;
1021// }
1022//
1023// h->channel_cb (h->channel_cls,
1024// &msg->destination,
1025// &msg->owner);
1026// }
1027
1028
1029
1030/**
1031 * Process a local reply about info on all tunnels, pass info to the user.
1032 *
1033 * @param h Cadet handle.
1034 * @param message Message itself.
1035 */
1036static void
1037process_get_peers (struct GNUNET_CADET_Handle *h,
1038 const struct GNUNET_MessageHeader *message)
1039{
1040 struct GNUNET_CADET_LocalInfoPeer *msg;
1041 uint16_t size;
1042
1043 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Get Peer messasge received\n");
1044
1045 if (NULL == h->info_cb.peers_cb)
1046 {
1047 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ignored\n");
1048 return;
1049 }
1050
1051 size = ntohs (message->size);
1052 if (sizeof (struct GNUNET_CADET_LocalInfoPeer) > size)
1053 {
1054 h->info_cb.peers_cb (h->info_cls, NULL, -1, 0, 0);
1055 h->info_cb.peers_cb = NULL;
1056 h->info_cls = NULL;
1057 return;
1058 }
1059
1060 msg = (struct GNUNET_CADET_LocalInfoPeer *) message;
1061 h->info_cb.peers_cb (h->info_cls, &msg->destination,
1062 (int) ntohs (msg->tunnel),
1063 (unsigned int ) ntohs (msg->paths),
1064 0);
1065}
1066
1067
1068/**
1069 * Process a local peer info reply, pass info to the user.
1070 *
1071 * @param h Cadet handle.
1072 * @param message Message itself.
1073 */
1074static void
1075process_get_peer (struct GNUNET_CADET_Handle *h,
1076 const struct GNUNET_MessageHeader *message)
1077{
1078 struct GNUNET_CADET_LocalInfoTunnel *msg;
1079 size_t esize;
1080 size_t msize;
1081 unsigned int ch_n;
1082 unsigned int c_n;
1083 struct GNUNET_CADET_Hash *conns;
1084 CADET_ChannelNumber *chns;
1085
1086 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Get Tunnel messasge received\n");
1087 if (NULL == h->info_cb.tunnel_cb)
1088 {
1089 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ignored\n");
1090 return;
1091 }
1092
1093 /* Verify message sanity */
1094 msg = (struct GNUNET_CADET_LocalInfoTunnel *) message;
1095 msize = ntohs (message->size);
1096 esize = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
1097 if (esize > msize)
1098 {
1099 GNUNET_break_op (0);
1100 h->info_cb.tunnel_cb (h->info_cls, NULL, 0, 0, NULL, NULL, 0, 0);
1101 goto clean_cls;
1102 }
1103 ch_n = ntohl (msg->channels);
1104 c_n = ntohl (msg->connections);
1105 esize += ch_n * sizeof (CADET_ChannelNumber);
1106 esize += c_n * sizeof (struct GNUNET_CADET_Hash);
1107 if (msize != esize)
1108 {
1109 GNUNET_break_op (0);
1110 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "m:%u, e: %u (%u ch, %u conn)\n",
1111 msize, esize, ch_n, c_n);
1112 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%u (%u ch, %u conn)\n",
1113 sizeof (struct GNUNET_CADET_LocalInfoTunnel),
1114 sizeof (CADET_ChannelNumber), sizeof (struct GNUNET_HashCode));
1115 h->info_cb.tunnel_cb (h->info_cls, NULL, 0, 0, NULL, NULL, 0, 0);
1116 goto clean_cls;
1117 }
1118
1119 /* Call Callback with tunnel info. */
1120 conns = (struct GNUNET_CADET_Hash *) &msg[1];
1121 chns = (CADET_ChannelNumber *) &conns[c_n];
1122 h->info_cb.tunnel_cb (h->info_cls, &msg->destination,
1123 ch_n, c_n, chns, conns,
1124 ntohs (msg->estate), ntohs (msg->cstate));
1125
1126 clean_cls:
1127 h->info_cb.tunnel_cb = NULL;
1128 h->info_cls = NULL;
1129}
1130
1131
1132/**
1133 * Process a local reply about info on all tunnels, pass info to the user.
1134 *
1135 * @param h Cadet handle.
1136 * @param message Message itself.
1137 */
1138static void
1139process_get_tunnels (struct GNUNET_CADET_Handle *h,
1140 const struct GNUNET_MessageHeader *message)
1141{
1142 struct GNUNET_CADET_LocalInfoTunnel *msg;
1143 uint16_t size;
1144
1145 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Get Tunnels messasge received\n");
1146
1147 if (NULL == h->info_cb.tunnels_cb)
1148 {
1149 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ignored\n");
1150 return;
1151 }
1152
1153 size = ntohs (message->size);
1154 if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) > size)
1155 {
1156 h->info_cb.tunnels_cb (h->info_cls, NULL, 0, 0, 0, 0);
1157 h->info_cb.tunnels_cb = NULL;
1158 h->info_cls = NULL;
1159 return;
1160 }
1161
1162 msg = (struct GNUNET_CADET_LocalInfoTunnel *) message;
1163 h->info_cb.tunnels_cb (h->info_cls, &msg->destination,
1164 ntohl (msg->channels), ntohl (msg->connections),
1165 ntohs (msg->estate), ntohs (msg->cstate));
1166
1167}
1168
1169
1170/**
1171 * Process a local tunnel info reply, pass info to the user.
1172 *
1173 * @param h Cadet handle.
1174 * @param message Message itself.
1175 */
1176static void
1177process_get_tunnel (struct GNUNET_CADET_Handle *h,
1178 const struct GNUNET_MessageHeader *message)
1179{
1180 struct GNUNET_CADET_LocalInfoTunnel *msg;
1181 size_t esize;
1182 size_t msize;
1183 unsigned int ch_n;
1184 unsigned int c_n;
1185 struct GNUNET_CADET_Hash *conns;
1186 CADET_ChannelNumber *chns;
1187
1188 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Get Tunnel messasge received\n");
1189 if (NULL == h->info_cb.tunnel_cb)
1190 {
1191 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, " ignored\n");
1192 return;
1193 }
1194
1195 /* Verify message sanity */
1196 msg = (struct GNUNET_CADET_LocalInfoTunnel *) message;
1197 msize = ntohs (message->size);
1198 esize = sizeof (struct GNUNET_CADET_LocalInfoTunnel);
1199 if (esize > msize)
1200 {
1201 GNUNET_break_op (0);
1202 h->info_cb.tunnel_cb (h->info_cls, NULL, 0, 0, NULL, NULL, 0, 0);
1203 goto clean_cls;
1204 }
1205 ch_n = ntohl (msg->channels);
1206 c_n = ntohl (msg->connections);
1207 esize += ch_n * sizeof (CADET_ChannelNumber);
1208 esize += c_n * sizeof (struct GNUNET_CADET_Hash);
1209 if (msize != esize)
1210 {
1211 GNUNET_break_op (0);
1212 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "m:%u, e: %u (%u ch, %u conn)\n",
1213 msize, esize, ch_n, c_n);
1214 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "%u (%u ch, %u conn)\n",
1215 sizeof (struct GNUNET_CADET_LocalInfoTunnel),
1216 sizeof (CADET_ChannelNumber), sizeof (struct GNUNET_HashCode));
1217 h->info_cb.tunnel_cb (h->info_cls, NULL, 0, 0, NULL, NULL, 0, 0);
1218 goto clean_cls;
1219 }
1220
1221 /* Call Callback with tunnel info. */
1222 conns = (struct GNUNET_CADET_Hash *) &msg[1];
1223 chns = (CADET_ChannelNumber *) &conns[c_n];
1224 h->info_cb.tunnel_cb (h->info_cls, &msg->destination,
1225 ch_n, c_n, chns, conns,
1226 ntohs (msg->estate), ntohs (msg->cstate));
1227
1228clean_cls:
1229 h->info_cb.tunnel_cb = NULL;
1230 h->info_cls = NULL;
1231}
1232
1233
1234/**
1235 * Function to process all messages received from the service
1236 *
1237 * @param cls closure
1238 * @param msg message received, NULL on timeout or fatal error
1239 */
1240static void
1241msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1242{
1243 struct GNUNET_CADET_Handle *h = cls;
1244 uint16_t type;
1245
1246 if (msg == NULL)
1247 {
1248 LOG (GNUNET_ERROR_TYPE_DEBUG,
1249 "Cadet service disconnected, reconnecting\n", h);
1250 reconnect (h);
1251 return;
1252 }
1253 type = ntohs (msg->type);
1254 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1255 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a message: %s\n",
1256 GM_m2s (type));
1257 switch (type)
1258 {
1259 /* Notify of a new incoming channel */
1260 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1261 process_channel_created (h, (struct GNUNET_CADET_ChannelMessage *) msg);
1262 break;
1263 /* Notify of a channel disconnection */
1264 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY: /* TODO separate(gid problem)*/
1265 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1266 process_channel_destroy (h, (struct GNUNET_CADET_ChannelMessage *) msg);
1267 break;
1268 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA:
1269 process_incoming_data (h, msg);
1270 break;
1271 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_ACK:
1272 process_ack (h, msg);
1273 break;
1274// case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNELS:
1275// process_get_channels (h, msg);
1276// break;
1277// case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNEL:
1278// process_show_channel (h, msg);
1279// break;
1280 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS:
1281 process_get_peers (h, msg);
1282 break;
1283 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER:
1284 process_get_peer (h, msg);
1285 break;
1286 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS:
1287 process_get_tunnels (h, msg);
1288 break;
1289 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL:
1290 process_get_tunnel (h, msg);
1291 break;
1292// case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNEL:
1293// process_show_channel (h, msg);
1294// break;
1295 default:
1296 /* We shouldn't get any other packages, log and ignore */
1297 LOG (GNUNET_ERROR_TYPE_WARNING,
1298 "unsolicited message form service (type %s)\n",
1299 GM_m2s (ntohs (msg->type)));
1300 }
1301 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1302 if (GNUNET_YES == h->in_receive)
1303 {
1304 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1305 GNUNET_TIME_UNIT_FOREVER_REL);
1306 }
1307 else
1308 {
1309 LOG (GNUNET_ERROR_TYPE_DEBUG,
1310 "in receive off, not calling CLIENT_receive\n");
1311 }
1312}
1313
1314
1315/******************************************************************************/
1316/************************ SEND FUNCTIONS ****************************/
1317/******************************************************************************/
1318
1319/**
1320 * Function called to send a message to the service.
1321 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1322 * the meantime.
1323 *
1324 * @param cls closure, the cadet handle
1325 * @param size number of bytes available in buf
1326 * @param buf where the callee should write the connect message
1327 * @return number of bytes written to buf
1328 */
1329static size_t
1330send_callback (void *cls, size_t size, void *buf)
1331{
1332 struct GNUNET_CADET_Handle *h = cls;
1333 struct GNUNET_CADET_TransmitHandle *th;
1334 struct GNUNET_CADET_TransmitHandle *next;
1335 struct GNUNET_CADET_Channel *ch;
1336 char *cbuf = buf;
1337 size_t tsize;
1338 size_t psize;
1339 size_t nsize;
1340
1341 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1342 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() Buffer %u\n", size);
1343 if ((0 == size) || (NULL == buf))
1344 {
1345 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Received NULL send callback on %p\n", h);
1346 reconnect (h);
1347 h->th = NULL;
1348 return 0;
1349 }
1350 tsize = 0;
1351 next = h->th_head;
1352 nsize = message_ready_size (h);
1353 while ((NULL != (th = next)) && (0 < nsize) && (size >= nsize))
1354 {
1355 ch = th->channel;
1356 if (GNUNET_YES == th_is_payload (th))
1357 {
1358 struct GNUNET_CADET_LocalData *dmsg;
1359 struct GNUNET_MessageHeader *mh;
1360
1361 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload\n");
1362 if (GNUNET_NO == ch->allow_send)
1363 {
1364 /* This channel is not ready to transmit yet, try next message */
1365 next = th->next;
1366 continue;
1367 }
1368 ch->packet_size = 0;
1369 GNUNET_assert (size >= th->size);
1370 dmsg = (struct GNUNET_CADET_LocalData *) cbuf;
1371 mh = (struct GNUNET_MessageHeader *) &dmsg[1];
1372 psize = th->notify (th->notify_cls,
1373 size - sizeof (struct GNUNET_CADET_LocalData),
1374 mh);
1375 if (psize > 0)
1376 {
1377 psize += sizeof (struct GNUNET_CADET_LocalData);
1378 GNUNET_assert (size >= psize);
1379 dmsg->header.size = htons (psize);
1380 dmsg->id = htonl (ch->chid);
1381 dmsg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_DATA);
1382 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload type %s\n",
1383 GM_m2s (ntohs (mh->type)));
1384 ch->allow_send = GNUNET_NO;
1385 }
1386 else
1387 {
1388 LOG (GNUNET_ERROR_TYPE_DEBUG,
1389 "# callback returned size 0, "
1390 "application canceled transmission\n");
1391 }
1392 }
1393 else
1394 {
1395 struct GNUNET_MessageHeader *mh = (struct GNUNET_MessageHeader *) &th[1];
1396
1397 LOG (GNUNET_ERROR_TYPE_DEBUG, "# cadet internal traffic, type %s\n",
1398 GM_m2s (ntohs (mh->type)));
1399 memcpy (cbuf, &th[1], th->size);
1400 psize = th->size;
1401 }
1402 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1403 GNUNET_SCHEDULER_cancel (th->timeout_task);
1404 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1405 GNUNET_free (th);
1406 next = h->th_head;
1407 nsize = message_ready_size (h);
1408 cbuf += psize;
1409 size -= psize;
1410 tsize += psize;
1411 }
1412 LOG (GNUNET_ERROR_TYPE_DEBUG, "# total size: %u\n", tsize);
1413 h->th = NULL;
1414 size = message_ready_size (h);
1415 if (0 != size)
1416 {
1417 LOG (GNUNET_ERROR_TYPE_DEBUG, "# next size: %u\n", size);
1418 h->th =
1419 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
1420 GNUNET_TIME_UNIT_FOREVER_REL,
1421 GNUNET_YES, &send_callback, h);
1422 }
1423 else
1424 {
1425 if (NULL != h->th_head)
1426 LOG (GNUNET_ERROR_TYPE_DEBUG, "# can't transmit any more\n");
1427 else
1428 LOG (GNUNET_ERROR_TYPE_DEBUG, "# nothing left to transmit\n");
1429 }
1430 if (GNUNET_NO == h->in_receive)
1431 {
1432 LOG (GNUNET_ERROR_TYPE_DEBUG, "# start receiving from service\n");
1433 h->in_receive = GNUNET_YES;
1434 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1435 GNUNET_TIME_UNIT_FOREVER_REL);
1436 }
1437 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() END\n");
1438 return tsize;
1439}
1440
1441
1442/**
1443 * Auxiliary function to send an already constructed packet to the service.
1444 * Takes care of creating a new queue element, copying the message and
1445 * calling the tmt_rdy function if necessary.
1446 *
1447 * @param h cadet handle
1448 * @param msg message to transmit
1449 * @param channel channel this send is related to (NULL if N/A)
1450 */
1451static void
1452send_packet (struct GNUNET_CADET_Handle *h,
1453 const struct GNUNET_MessageHeader *msg,
1454 struct GNUNET_CADET_Channel *channel)
1455{
1456 struct GNUNET_CADET_TransmitHandle *th;
1457 size_t msize;
1458
1459 LOG (GNUNET_ERROR_TYPE_DEBUG, " Sending message to service: %s\n",
1460 GM_m2s(ntohs(msg->type)));
1461 msize = ntohs (msg->size);
1462 th = GNUNET_malloc (sizeof (struct GNUNET_CADET_TransmitHandle) + msize);
1463 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1464 th->size = msize;
1465 th->channel = channel;
1466 memcpy (&th[1], msg, msize);
1467 add_to_queue (h, th);
1468 LOG (GNUNET_ERROR_TYPE_DEBUG, " queued\n");
1469 if (NULL != h->th)
1470 return;
1471 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling ntfy tmt rdy for %u bytes\n", msize);
1472 h->th =
1473 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1474 GNUNET_TIME_UNIT_FOREVER_REL,
1475 GNUNET_YES, &send_callback, h);
1476}
1477
1478
1479/******************************************************************************/
1480/********************** API CALL DEFINITIONS *************************/
1481/******************************************************************************/
1482
1483struct GNUNET_CADET_Handle *
1484GNUNET_CADET_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
1485 GNUNET_CADET_InboundChannelNotificationHandler new_channel,
1486 GNUNET_CADET_ChannelEndHandler cleaner,
1487 const struct GNUNET_CADET_MessageHandler *handlers,
1488 const uint32_t *ports)
1489{
1490 struct GNUNET_CADET_Handle *h;
1491
1492 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_CADET_connect()\n");
1493 h = GNUNET_new (struct GNUNET_CADET_Handle);
1494 LOG (GNUNET_ERROR_TYPE_DEBUG, " addr %p\n", h);
1495 h->cfg = cfg;
1496 h->new_channel = new_channel;
1497 h->cleaner = cleaner;
1498 h->client = GNUNET_CLIENT_connect ("cadet", cfg);
1499 if (h->client == NULL)
1500 {
1501 GNUNET_break (0);
1502 GNUNET_free (h);
1503 return NULL;
1504 }
1505 h->cls = cls;
1506 h->message_handlers = handlers;
1507 h->ports = ports;
1508 h->next_chid = GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
1509 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1510 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1511
1512 if (NULL != ports && ports[0] != 0 && NULL == new_channel)
1513 {
1514 GNUNET_break (0);
1515 LOG (GNUNET_ERROR_TYPE_DEBUG,
1516 "no new channel handler given, ports parameter is useless!!\n");
1517 }
1518 if ((NULL == ports || ports[0] == 0) && NULL != new_channel)
1519 {
1520 GNUNET_break (0);
1521 LOG (GNUNET_ERROR_TYPE_DEBUG,
1522 "no ports given, new channel handler will never be called!!\n");
1523 }
1524 /* count handlers */
1525 for (h->n_handlers = 0;
1526 handlers && handlers[h->n_handlers].type;
1527 h->n_handlers++) ;
1528 for (h->n_ports = 0;
1529 ports && ports[h->n_ports];
1530 h->n_ports++) ;
1531 send_connect (h);
1532 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_CADET_connect() END\n");
1533 return h;
1534}
1535
1536
1537void
1538GNUNET_CADET_disconnect (struct GNUNET_CADET_Handle *handle)
1539{
1540 struct GNUNET_CADET_Channel *ch;
1541 struct GNUNET_CADET_Channel *aux;
1542 struct GNUNET_CADET_TransmitHandle *th;
1543
1544 LOG (GNUNET_ERROR_TYPE_DEBUG, "CADET DISCONNECT\n");
1545
1546 ch = handle->channels_head;
1547 while (NULL != ch)
1548 {
1549 aux = ch->next;
1550 if (ch->chid < GNUNET_CADET_LOCAL_CHANNEL_ID_SERV)
1551 {
1552 GNUNET_break (0);
1553 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X not destroyed\n", ch->chid);
1554 }
1555 destroy_channel (ch, GNUNET_YES);
1556 ch = aux;
1557 }
1558 while ( (th = handle->th_head) != NULL)
1559 {
1560 struct GNUNET_MessageHeader *msg;
1561
1562 /* Make sure it is an allowed packet (everything else should have been
1563 * already canceled).
1564 */
1565 GNUNET_break (GNUNET_NO == th_is_payload (th));
1566 msg = (struct GNUNET_MessageHeader *) &th[1];
1567 switch (ntohs(msg->type))
1568 {
1569 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_CONNECT:
1570 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1571 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1572 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNELS:
1573 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNEL:
1574 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER:
1575 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS:
1576 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL:
1577 case GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS:
1578 break;
1579 default:
1580 GNUNET_break (0);
1581 LOG (GNUNET_ERROR_TYPE_ERROR, "unexpected msg %u\n",
1582 ntohs(msg->type));
1583 }
1584
1585 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1586 GNUNET_free (th);
1587 }
1588
1589 if (NULL != handle->th)
1590 {
1591 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1592 handle->th = NULL;
1593 }
1594 if (NULL != handle->client)
1595 {
1596 GNUNET_CLIENT_disconnect (handle->client);
1597 handle->client = NULL;
1598 }
1599 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1600 {
1601 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1602 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1603 }
1604 GNUNET_free (handle);
1605}
1606
1607
1608/**
1609 * Create a new channel towards a remote peer.
1610 *
1611 * If the destination port is not open by any peer or the destination peer
1612 * does not accept the channel, #GNUNET_CADET_ChannelEndHandler will be called
1613 * for this channel.
1614 *
1615 * @param h cadet handle
1616 * @param channel_ctx client's channel context to associate with the channel
1617 * @param peer peer identity the channel should go to
1618 * @param port Port number.
1619 * @param options CadetOption flag field, with all desired option bits set to 1.
1620 *
1621 * @return handle to the channel
1622 */
1623struct GNUNET_CADET_Channel *
1624GNUNET_CADET_channel_create (struct GNUNET_CADET_Handle *h,
1625 void *channel_ctx,
1626 const struct GNUNET_PeerIdentity *peer,
1627 uint32_t port,
1628 enum GNUNET_CADET_ChannelOption options)
1629{
1630 struct GNUNET_CADET_Channel *ch;
1631 struct GNUNET_CADET_ChannelMessage msg;
1632
1633 LOG (GNUNET_ERROR_TYPE_DEBUG,
1634 "Creating new channel to %s:%u\n",
1635 GNUNET_i2s (peer), port);
1636 ch = create_channel (h, 0);
1637 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", ch);
1638 LOG (GNUNET_ERROR_TYPE_DEBUG, " number %X\n", ch->chid);
1639 ch->ctx = channel_ctx;
1640 ch->peer = GNUNET_PEER_intern (peer);
1641 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE);
1642 msg.header.size = htons (sizeof (struct GNUNET_CADET_ChannelMessage));
1643 msg.channel_id = htonl (ch->chid);
1644 msg.port = htonl (port);
1645 msg.peer = *peer;
1646 msg.opt = htonl (options);
1647 ch->allow_send = 0;
1648 send_packet (h, &msg.header, ch);
1649 return ch;
1650}
1651
1652
1653void
1654GNUNET_CADET_channel_destroy (struct GNUNET_CADET_Channel *channel)
1655{
1656 struct GNUNET_CADET_Handle *h;
1657 struct GNUNET_CADET_ChannelMessage msg;
1658 struct GNUNET_CADET_TransmitHandle *th;
1659
1660 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying channel\n");
1661 h = channel->cadet;
1662
1663 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
1664 msg.header.size = htons (sizeof (struct GNUNET_CADET_ChannelMessage));
1665 msg.channel_id = htonl (channel->chid);
1666 memset (&msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
1667 msg.port = 0;
1668 msg.opt = 0;
1669 th = h->th_head;
1670 while (th != NULL)
1671 {
1672 struct GNUNET_CADET_TransmitHandle *aux;
1673 if (th->channel == channel)
1674 {
1675 aux = th->next;
1676 /* FIXME call the handler? */
1677 if (GNUNET_YES == th_is_payload (th))
1678 th->notify (th->notify_cls, 0, NULL);
1679 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1680 GNUNET_free (th);
1681 th = aux;
1682 }
1683 else
1684 th = th->next;
1685 }
1686
1687 destroy_channel (channel, GNUNET_YES);
1688 send_packet (h, &msg.header, NULL);
1689}
1690
1691
1692/**
1693 * Get information about a channel.
1694 *
1695 * @param channel Channel handle.
1696 * @param option Query (GNUNET_CADET_OPTION_*).
1697 * @param ... dependant on option, currently not used
1698 *
1699 * @return Union with an answer to the query.
1700 */
1701const union GNUNET_CADET_ChannelInfo *
1702GNUNET_CADET_channel_get_info (struct GNUNET_CADET_Channel *channel,
1703 enum GNUNET_CADET_ChannelOption option, ...)
1704{
1705 static int bool_flag;
1706 const union GNUNET_CADET_ChannelInfo *ret;
1707
1708 switch (option)
1709 {
1710 case GNUNET_CADET_OPTION_NOBUFFER:
1711 case GNUNET_CADET_OPTION_RELIABLE:
1712 case GNUNET_CADET_OPTION_OOORDER:
1713 if (0 != (option & channel->options))
1714 bool_flag = GNUNET_YES;
1715 else
1716 bool_flag = GNUNET_NO;
1717 ret = (const union GNUNET_CADET_ChannelInfo *) &bool_flag;
1718 break;
1719 case GNUNET_CADET_OPTION_PEER:
1720 ret = (const union GNUNET_CADET_ChannelInfo *) GNUNET_PEER_resolve2 (channel->peer);
1721 break;
1722 default:
1723 GNUNET_break (0);
1724 return NULL;
1725 }
1726
1727 return ret;
1728}
1729
1730struct GNUNET_CADET_TransmitHandle *
1731GNUNET_CADET_notify_transmit_ready (struct GNUNET_CADET_Channel *channel, int cork,
1732 struct GNUNET_TIME_Relative maxdelay,
1733 size_t notify_size,
1734 GNUNET_CONNECTION_TransmitReadyNotify notify,
1735 void *notify_cls)
1736{
1737 struct GNUNET_CADET_TransmitHandle *th;
1738
1739 GNUNET_assert (NULL != channel);
1740 LOG (GNUNET_ERROR_TYPE_DEBUG, "CADET NOTIFY TRANSMIT READY\n");
1741 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", channel->chid);
1742 LOG (GNUNET_ERROR_TYPE_DEBUG, " allow_send %d\n", channel->allow_send);
1743 if (channel->chid >= GNUNET_CADET_LOCAL_CHANNEL_ID_SERV)
1744 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin\n");
1745 else
1746 LOG (GNUNET_ERROR_TYPE_DEBUG, " to destination\n");
1747 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload size %u\n", notify_size);
1748 GNUNET_assert (NULL != notify);
1749 GNUNET_assert (0 == channel->packet_size); // Only one data packet allowed
1750 th = GNUNET_new (struct GNUNET_CADET_TransmitHandle);
1751 th->channel = channel;
1752 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1753 th->size = notify_size + sizeof (struct GNUNET_CADET_LocalData);
1754 channel->packet_size = th->size;
1755 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size %u\n", th->size);
1756 th->notify = notify;
1757 th->notify_cls = notify_cls;
1758 add_to_queue (channel->cadet, th);
1759 if (NULL != channel->cadet->th)
1760 return th;
1761 if (GNUNET_NO == channel->allow_send)
1762 return th;
1763 LOG (GNUNET_ERROR_TYPE_DEBUG, " call client notify tmt rdy\n");
1764 channel->cadet->th =
1765 GNUNET_CLIENT_notify_transmit_ready (channel->cadet->client, th->size,
1766 GNUNET_TIME_UNIT_FOREVER_REL,
1767 GNUNET_YES, &send_callback,
1768 channel->cadet);
1769 LOG (GNUNET_ERROR_TYPE_DEBUG, "CADET NOTIFY TRANSMIT READY END\n");
1770 return th;
1771}
1772
1773
1774void
1775GNUNET_CADET_notify_transmit_ready_cancel (struct GNUNET_CADET_TransmitHandle *th)
1776{
1777 struct GNUNET_CADET_Handle *cadet;
1778
1779 th->channel->packet_size = 0;
1780 cadet = th->channel->cadet;
1781 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1782 GNUNET_SCHEDULER_cancel (th->timeout_task);
1783 GNUNET_CONTAINER_DLL_remove (cadet->th_head, cadet->th_tail, th);
1784 GNUNET_free (th);
1785 if ((0 == message_ready_size (cadet)) && (NULL != cadet->th))
1786 {
1787 /* queue empty, no point in asking for transmission */
1788 GNUNET_CLIENT_notify_transmit_ready_cancel (cadet->th);
1789 cadet->th = NULL;
1790 }
1791}
1792
1793
1794void
1795GNUNET_CADET_receive_done (struct GNUNET_CADET_Channel *channel)
1796{
1797 send_ack (channel);
1798}
1799
1800
1801static void
1802send_info_request (struct GNUNET_CADET_Handle *h, uint16_t type)
1803{
1804 struct GNUNET_MessageHeader msg;
1805
1806 msg.size = htons (sizeof (msg));
1807 msg.type = htons (type);
1808 send_packet (h, &msg, NULL);
1809}
1810
1811
1812/**
1813 * Request information about peers known to the running cadet service.
1814 * The callback will be called for every peer known to the service.
1815 * Only one info request (of any kind) can be active at once.
1816 *
1817 *
1818 * WARNING: unstable API, likely to change in the future!
1819 *
1820 * @param h Handle to the cadet peer.
1821 * @param callback Function to call with the requested data.
1822 * @param callback_cls Closure for @c callback.
1823 *
1824 * @return #GNUNET_OK / #GNUNET_SYSERR
1825 */
1826int
1827GNUNET_CADET_get_peers (struct GNUNET_CADET_Handle *h,
1828 GNUNET_CADET_PeersCB callback,
1829 void *callback_cls)
1830{
1831 if (NULL != h->info_cb.peers_cb)
1832 {
1833 GNUNET_break (0);
1834 return GNUNET_SYSERR;
1835 }
1836 send_info_request (h, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEERS);
1837 h->info_cb.peers_cb = callback;
1838 h->info_cls = callback_cls;
1839 return GNUNET_OK;
1840}
1841
1842
1843/**
1844 * Cancel a peer info request. The callback will not be called (anymore).
1845 *
1846 * WARNING: unstable API, likely to change in the future!
1847 *
1848 * @param h Cadet handle.
1849 *
1850 * @return Closure given to GNUNET_CADET_get_peers.
1851 */
1852void *
1853GNUNET_CADET_get_peers_cancel (struct GNUNET_CADET_Handle *h)
1854{
1855 void *cls;
1856
1857 cls = h->info_cls;
1858 h->info_cb.peers_cb = NULL;
1859 h->info_cls = NULL;
1860 return cls;
1861}
1862
1863
1864/**
1865 * Request information about a peer known to the running cadet peer.
1866 * The callback will be called for the tunnel once.
1867 * Only one info request (of any kind) can be active at once.
1868 *
1869 * WARNING: unstable API, likely to change in the future!
1870 *
1871 * @param h Handle to the cadet peer.
1872 * @param id Peer whose tunnel to examine.
1873 * @param callback Function to call with the requested data.
1874 * @param callback_cls Closure for @c callback.
1875 *
1876 * @return #GNUNET_OK / #GNUNET_SYSERR
1877 */
1878int
1879GNUNET_CADET_get_peer (struct GNUNET_CADET_Handle *h,
1880 const struct GNUNET_PeerIdentity *id,
1881 GNUNET_CADET_PeerCB callback,
1882 void *callback_cls)
1883{
1884 struct GNUNET_CADET_LocalInfo msg;
1885
1886 if (NULL != h->info_cb.peer_cb)
1887 {
1888 GNUNET_break (0);
1889 return GNUNET_SYSERR;
1890 }
1891
1892 memset (&msg, 0, sizeof (msg));
1893 msg.header.size = htons (sizeof (msg));
1894 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_PEER);
1895 msg.peer = *id;
1896 send_packet (h, &msg.header, NULL);
1897 h->info_cb.peer_cb = callback;
1898 h->info_cls = callback_cls;
1899 return GNUNET_OK;
1900}
1901
1902
1903/**
1904 * Request information about tunnels of the running cadet peer.
1905 * The callback will be called for every tunnel of the service.
1906 * Only one info request (of any kind) can be active at once.
1907 *
1908 * WARNING: unstable API, likely to change in the future!
1909 *
1910 * @param h Handle to the cadet peer.
1911 * @param callback Function to call with the requested data.
1912 * @param callback_cls Closure for @c callback.
1913 *
1914 * @return #GNUNET_OK / #GNUNET_SYSERR
1915 */
1916int
1917GNUNET_CADET_get_tunnels (struct GNUNET_CADET_Handle *h,
1918 GNUNET_CADET_TunnelsCB callback,
1919 void *callback_cls)
1920{
1921 if (NULL != h->info_cb.tunnels_cb)
1922 {
1923 GNUNET_break (0);
1924 return GNUNET_SYSERR;
1925 }
1926 send_info_request (h, GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNELS);
1927 h->info_cb.tunnels_cb = callback;
1928 h->info_cls = callback_cls;
1929 return GNUNET_OK;
1930}
1931
1932
1933/**
1934 * Cancel a monitor request. The monitor callback will not be called.
1935 *
1936 * @param h Cadet handle.
1937 *
1938 * @return Closure given to GNUNET_CADET_get_tunnels.
1939 */
1940void *
1941GNUNET_CADET_get_tunnels_cancel (struct GNUNET_CADET_Handle *h)
1942{
1943 void *cls;
1944
1945 h->info_cb.tunnels_cb = NULL;
1946 cls = h->info_cls;
1947 h->info_cls = NULL;
1948
1949 return cls;
1950}
1951
1952
1953
1954/**
1955 * Request information about a tunnel of the running cadet peer.
1956 * The callback will be called for the tunnel once.
1957 * Only one info request (of any kind) can be active at once.
1958 *
1959 * WARNING: unstable API, likely to change in the future!
1960 *
1961 * @param h Handle to the cadet peer.
1962 * @param id Peer whose tunnel to examine.
1963 * @param callback Function to call with the requested data.
1964 * @param callback_cls Closure for @c callback.
1965 *
1966 * @return #GNUNET_OK / #GNUNET_SYSERR
1967 */
1968int
1969GNUNET_CADET_get_tunnel (struct GNUNET_CADET_Handle *h,
1970 const struct GNUNET_PeerIdentity *id,
1971 GNUNET_CADET_TunnelCB callback,
1972 void *callback_cls)
1973{
1974 struct GNUNET_CADET_LocalInfo msg;
1975
1976 if (NULL != h->info_cb.tunnel_cb)
1977 {
1978 GNUNET_break (0);
1979 return GNUNET_SYSERR;
1980 }
1981
1982 memset (&msg, 0, sizeof (msg));
1983 msg.header.size = htons (sizeof (msg));
1984 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_TUNNEL);
1985 msg.peer = *id;
1986 send_packet (h, &msg.header, NULL);
1987 h->info_cb.tunnel_cb = callback;
1988 h->info_cls = callback_cls;
1989 return GNUNET_OK;
1990}
1991
1992
1993/**
1994 * Request information about a specific channel of the running cadet peer.
1995 *
1996 * WARNING: unstable API, likely to change in the future!
1997 * FIXME Add destination option.
1998 *
1999 * @param h Handle to the cadet peer.
2000 * @param initiator ID of the owner of the channel.
2001 * @param channel_number Channel number.
2002 * @param callback Function to call with the requested data.
2003 * @param callback_cls Closure for @c callback.
2004 *
2005 * @return #GNUNET_OK / #GNUNET_SYSERR
2006 */
2007int
2008GNUNET_CADET_show_channel (struct GNUNET_CADET_Handle *h,
2009 struct GNUNET_PeerIdentity *initiator,
2010 unsigned int channel_number,
2011 GNUNET_CADET_ChannelCB callback,
2012 void *callback_cls)
2013{
2014 struct GNUNET_CADET_LocalInfo msg;
2015
2016 if (NULL != h->info_cb.channel_cb)
2017 {
2018 GNUNET_break (0);
2019 return GNUNET_SYSERR;
2020 }
2021
2022 msg.header.size = htons (sizeof (msg));
2023 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_LOCAL_INFO_CHANNEL);
2024 msg.peer = *initiator;
2025 msg.channel_id = htonl (channel_number);
2026// msg.reserved = 0;
2027 send_packet (h, &msg.header, NULL);
2028 h->info_cb.channel_cb = callback;
2029 h->info_cls = callback_cls;
2030 return GNUNET_OK;
2031}
2032
2033
2034/**
2035 * Function called to notify a client about the connection
2036 * begin ready to queue more data. "buf" will be
2037 * NULL and "size" zero if the connection was closed for
2038 * writing in the meantime.
2039 *
2040 * @param cls closure
2041 * @param size number of bytes available in buf
2042 * @param buf where the callee should write the message
2043 * @return number of bytes written to buf
2044 */
2045static size_t
2046cadet_mq_ntr (void *cls, size_t size,
2047 void *buf)
2048{
2049 struct GNUNET_MQ_Handle *mq = cls;
2050 struct CadetMQState *state = GNUNET_MQ_impl_state (mq);
2051 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
2052 uint16_t msize;
2053
2054 state->th = NULL;
2055 if (NULL == buf)
2056 {
2057 GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_WRITE);
2058 return 0;
2059 }
2060 msize = ntohs (msg->size);
2061 GNUNET_assert (msize <= size);
2062 memcpy (buf, msg, msize);
2063 GNUNET_MQ_impl_send_continue (mq);
2064 return msize;
2065}
2066
2067
2068/**
2069 * Signature of functions implementing the
2070 * sending functionality of a message queue.
2071 *
2072 * @param mq the message queue
2073 * @param msg the message to send
2074 * @param impl_state state of the implementation
2075 */
2076static void
2077cadet_mq_send_impl (struct GNUNET_MQ_Handle *mq,
2078 const struct GNUNET_MessageHeader *msg, void *impl_state)
2079{
2080 struct CadetMQState *state = impl_state;
2081
2082 GNUNET_assert (NULL == state->th);
2083 state->th =
2084 GNUNET_CADET_notify_transmit_ready (state->channel,
2085 /* FIXME: add option for corking */
2086 GNUNET_NO,
2087 GNUNET_TIME_UNIT_FOREVER_REL,
2088 ntohs (msg->size),
2089 cadet_mq_ntr, mq);
2090
2091}
2092
2093
2094/**
2095 * Signature of functions implementing the
2096 * destruction of a message queue.
2097 * Implementations must not free 'mq', but should
2098 * take care of 'impl_state'.
2099 *
2100 * @param mq the message queue to destroy
2101 * @param impl_state state of the implementation
2102 */
2103static void
2104cadet_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
2105{
2106 struct CadetMQState *state = impl_state;
2107
2108 if (NULL != state->th)
2109 GNUNET_CADET_notify_transmit_ready_cancel (state->th);
2110
2111 GNUNET_free (state);
2112}
2113
2114
2115/**
2116 * Create a message queue for a cadet channel.
2117 * The message queue can only be used to transmit messages,
2118 * not to receive them.
2119 *
2120 * @param channel the channel to create the message qeue for
2121 * @return a message queue to messages over the channel
2122 */
2123struct GNUNET_MQ_Handle *
2124GNUNET_CADET_mq_create (struct GNUNET_CADET_Channel *channel)
2125{
2126 struct GNUNET_MQ_Handle *mq;
2127 struct CadetMQState *state;
2128
2129 state = GNUNET_new (struct CadetMQState);
2130 state->channel = channel;
2131
2132 mq = GNUNET_MQ_queue_for_callbacks (cadet_mq_send_impl,
2133 cadet_mq_destroy_impl,
2134 NULL, /* FIXME: cancel impl. */
2135 state,
2136 NULL, /* no msg handlers */
2137 NULL, /* no err handlers */
2138 NULL); /* no handler cls */
2139 return mq;
2140}
2141
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-01 07:57:45 +0000