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-rw-r--r--src/mesh/mesh_api_enc.c1794
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diff --git a/src/mesh/mesh_api_enc.c b/src/mesh/mesh_api_enc.c
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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 mesh/mesh_api_enc.c
20 * @brief mesh api: client implementation of new mesh service
21 * @author Bartlomiej Polot
22 */
23
24#include "platform.h"
25#include "gnunet_util_lib.h"
26#include "gnunet_mesh_service_enc.h"
27#include "mesh_enc.h"
28#include "mesh_protocol_enc.h"
29
30#define LOG(kind,...) GNUNET_log_from (kind, "mesh-api",__VA_ARGS__)
31
32/******************************************************************************/
33/************************ DATA STRUCTURES ****************************/
34/******************************************************************************/
35
36/**
37 * Transmission queue to the service
38 */
39struct GNUNET_MESH_TransmitHandle
40{
41
42 /**
43 * Double Linked list
44 */
45 struct GNUNET_MESH_TransmitHandle *next;
46
47 /**
48 * Double Linked list
49 */
50 struct GNUNET_MESH_TransmitHandle *prev;
51
52 /**
53 * Channel this message is sent on / for (may be NULL for control messages).
54 */
55 struct GNUNET_MESH_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
89
90/**
91 * Opaque handle to the service.
92 */
93struct GNUNET_MESH_Handle
94{
95
96 /**
97 * Handle to the server connection, to send messages later
98 */
99 struct GNUNET_CLIENT_Connection *client;
100
101 /**
102 * Set of handlers used for processing incoming messages in the channels
103 */
104 const struct GNUNET_MESH_MessageHandler *message_handlers;
105
106 /**
107 * Number of handlers in the handlers array.
108 */
109 unsigned int n_handlers;
110
111 /**
112 * Ports open.
113 */
114 const uint32_t *ports;
115
116 /**
117 * Number of ports.
118 */
119 unsigned int n_ports;
120
121 /**
122 * Double linked list of the channels this client is connected to, head.
123 */
124 struct GNUNET_MESH_Channel *channels_head;
125
126 /**
127 * Double linked list of the channels this client is connected to, tail.
128 */
129 struct GNUNET_MESH_Channel *channels_tail;
130
131 /**
132 * Callback for inbound channel creation
133 */
134 GNUNET_MESH_InboundChannelNotificationHandler *new_channel;
135
136 /**
137 * Callback for inbound channel disconnection
138 */
139 GNUNET_MESH_ChannelEndHandler *cleaner;
140
141 /**
142 * Handle to cancel pending transmissions in case of disconnection
143 */
144 struct GNUNET_CLIENT_TransmitHandle *th;
145
146 /**
147 * Closure for all the handlers given by the client
148 */
149 void *cls;
150
151 /**
152 * Messages to send to the service, head.
153 */
154 struct GNUNET_MESH_TransmitHandle *th_head;
155
156 /**
157 * Messages to send to the service, tail.
158 */
159 struct GNUNET_MESH_TransmitHandle *th_tail;
160
161 /**
162 * chid of the next channel to create (to avoid reusing IDs often)
163 */
164 MESH_ChannelNumber next_chid;
165
166 /**
167 * Have we started the task to receive messages from the service
168 * yet? We do this after we send the 'MESH_LOCAL_CONNECT' message.
169 */
170 int in_receive;
171
172 /**
173 * Configuration given by the client, in case of reconnection
174 */
175 const struct GNUNET_CONFIGURATION_Handle *cfg;
176
177 /**
178 * Time to the next reconnect in case one reconnect fails
179 */
180 struct GNUNET_TIME_Relative reconnect_time;
181
182 /**
183 * Task for trying to reconnect.
184 */
185 GNUNET_SCHEDULER_TaskIdentifier reconnect_task;
186
187 /**
188 * Monitor callback
189 */
190 GNUNET_MESH_ChannelsCB channels_cb;
191
192 /**
193 * Monitor callback closure.
194 */
195 void *channels_cls;
196
197 /**
198 * Channel callback.
199 */
200 GNUNET_MESH_ChannelCB channel_cb;
201
202 /**
203 * Channel callback closure.
204 */
205 void *channel_cls;
206};
207
208
209/**
210 * Description of a peer
211 */
212struct GNUNET_MESH_Peer
213{
214 /**
215 * ID of the peer in short form
216 */
217 GNUNET_PEER_Id id;
218
219 /**
220 * Channel this peer belongs to
221 */
222 struct GNUNET_MESH_Channel *t;
223
224 /**
225 * Flag indicating whether service has informed about its connection
226 * FIXME-BART: is this flag used? Seems dead right now...
227 */
228 int connected;
229
230};
231
232
233/**
234 * Opaque handle to a channel.
235 */
236struct GNUNET_MESH_Channel
237{
238
239 /**
240 * DLL next
241 */
242 struct GNUNET_MESH_Channel *next;
243
244 /**
245 * DLL prev
246 */
247 struct GNUNET_MESH_Channel *prev;
248
249 /**
250 * Handle to the mesh this channel belongs to
251 */
252 struct GNUNET_MESH_Handle *mesh;
253
254 /**
255 * Local ID of the channel
256 */
257 MESH_ChannelNumber chid;
258
259 /**
260 * Port number.
261 */
262 uint32_t port;
263
264 /**
265 * Other end of the channel.
266 */
267 GNUNET_PEER_Id peer;
268
269 /**
270 * Any data the caller wants to put in here
271 */
272 void *ctx;
273
274 /**
275 * Size of packet queued in this channel
276 */
277 unsigned int packet_size;
278
279 /**
280 * Is the channel allowed to buffer?
281 */
282 int nobuffer;
283
284 /**
285 * Is the channel realiable?
286 */
287 int reliable;
288
289 /**
290 * If reliable, is the channel out of order?
291 */
292 int ooorder;
293
294 /**
295 * Are we allowed to send to the service?
296 */
297 int allow_send;
298
299};
300
301
302/**
303 * Implementation state for mesh's message queue.
304 */
305struct MeshMQState
306{
307 /**
308 * The current transmit handle, or NULL
309 * if no transmit is active.
310 */
311 struct GNUNET_MESH_TransmitHandle *th;
312
313 /**
314 * Channel to send the data over.
315 */
316 struct GNUNET_MESH_Channel *channel;
317};
318
319
320/******************************************************************************/
321/*********************** DECLARATIONS *************************/
322/******************************************************************************/
323
324/**
325 * Function called to send a message to the service.
326 * "buf" will be NULL and "size" zero if the socket was closed for writing in
327 * the meantime.
328 *
329 * @param cls closure, the mesh handle
330 * @param size number of bytes available in buf
331 * @param buf where the callee should write the connect message
332 * @return number of bytes written to buf
333 */
334static size_t
335send_callback (void *cls, size_t size, void *buf);
336
337
338/******************************************************************************/
339/*********************** AUXILIARY FUNCTIONS *************************/
340/******************************************************************************/
341
342/**
343 * Check if transmission is a payload packet.
344 *
345 * @param th Transmission handle.
346 *
347 * @return GNUNET_YES if it is a payload packet,
348 * GNUNET_NO if it is a mesh management packet.
349 */
350static int
351th_is_payload (struct GNUNET_MESH_TransmitHandle *th)
352{
353 return (th->notify != NULL) ? GNUNET_YES : GNUNET_NO;
354}
355
356
357/**
358 * Check whether there is any message ready in the queue and find the size.
359 *
360 * @param h Mesh handle.
361 *
362 * @return The size of the first ready message in the queue,
363 * 0 if there is none.
364 */
365static size_t
366message_ready_size (struct GNUNET_MESH_Handle *h)
367{
368 struct GNUNET_MESH_TransmitHandle *th;
369 struct GNUNET_MESH_Channel *ch;
370
371 for (th = h->th_head; NULL != th; th = th->next)
372 {
373 ch = th->channel;
374 if (GNUNET_NO == th_is_payload (th))
375 {
376 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message internal\n");
377 return th->size;
378 }
379 if (GNUNET_YES == ch->allow_send)
380 {
381 LOG (GNUNET_ERROR_TYPE_DEBUG, "# message payload ok\n");
382 return th->size;
383 }
384 }
385 return 0;
386}
387
388
389/**
390 * Get the channel handler for the channel specified by id from the given handle
391 * @param h Mesh handle
392 * @param chid ID of the wanted channel
393 * @return handle to the required channel or NULL if not found
394 */
395static struct GNUNET_MESH_Channel *
396retrieve_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
397{
398 struct GNUNET_MESH_Channel *ch;
399
400 ch = h->channels_head;
401 while (ch != NULL)
402 {
403 if (ch->chid == chid)
404 return ch;
405 ch = ch->next;
406 }
407 return NULL;
408}
409
410
411/**
412 * Create a new channel and insert it in the channel list of the mesh handle
413 *
414 * @param h Mesh handle
415 * @param chid Desired chid of the channel, 0 to assign one automatically.
416 *
417 * @return Handle to the created channel.
418 */
419static struct GNUNET_MESH_Channel *
420create_channel (struct GNUNET_MESH_Handle *h, MESH_ChannelNumber chid)
421{
422 struct GNUNET_MESH_Channel *ch;
423
424 ch = GNUNET_malloc (sizeof (struct GNUNET_MESH_Channel));
425 GNUNET_CONTAINER_DLL_insert (h->channels_head, h->channels_tail, ch);
426 ch->mesh = h;
427 if (0 == chid)
428 {
429 ch->chid = h->next_chid;
430 while (NULL != retrieve_channel (h, h->next_chid))
431 {
432 h->next_chid++;
433 h->next_chid &= ~GNUNET_MESH_LOCAL_CHANNEL_ID_SERV;
434 h->next_chid |= GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
435 }
436 }
437 else
438 {
439 ch->chid = chid;
440 }
441 ch->allow_send = GNUNET_NO;
442 ch->nobuffer = 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_MESH_Channel *ch, int call_cleaner)
461{
462 struct GNUNET_MESH_Handle *h;
463 struct GNUNET_MESH_TransmitHandle *th;
464 struct GNUNET_MESH_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->mesh;
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 h->cleaner (h->cls, ch, ch->ctx);
480
481 /* check that clients did not leave messages behind in the queue */
482 for (th = h->th_head; NULL != th; th = next)
483 {
484 next = th->next;
485 if (th->channel != ch)
486 continue;
487 /* Clients should have aborted their requests already.
488 * Management traffic should be ok, as clients can't cancel that */
489 GNUNET_break (GNUNET_NO == th_is_payload (th));
490 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
491
492 /* clean up request */
493 if (GNUNET_SCHEDULER_NO_TASK != th->timeout_task)
494 GNUNET_SCHEDULER_cancel (th->timeout_task);
495 GNUNET_free (th);
496 }
497
498 /* if there are no more pending requests with mesh service, cancel active request */
499 /* Note: this should be unnecessary... */
500 if ((0 == message_ready_size (h)) && (NULL != h->th))
501 {
502 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
503 h->th = NULL;
504 }
505
506 if (0 != ch->peer)
507 GNUNET_PEER_change_rc (ch->peer, -1);
508 GNUNET_free (ch);
509 return;
510}
511
512
513/**
514 * Notify client that the transmission has timed out
515 *
516 * @param cls closure
517 * @param tc task context
518 */
519static void
520timeout_transmission (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
521{
522 struct GNUNET_MESH_TransmitHandle *th = cls;
523 struct GNUNET_MESH_Handle *mesh;
524
525 mesh = th->channel->mesh;
526 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
527 th->channel->packet_size = 0;
528 if (GNUNET_YES == th_is_payload (th))
529 th->notify (th->notify_cls, 0, NULL);
530 GNUNET_free (th);
531 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
532 {
533 /* nothing ready to transmit, no point in asking for transmission */
534 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
535 mesh->th = NULL;
536 }
537}
538
539
540/**
541 * Add a transmit handle to the transmission queue and set the
542 * timeout if needed.
543 *
544 * @param h mesh handle with the queue head and tail
545 * @param th handle to the packet to be transmitted
546 */
547static void
548add_to_queue (struct GNUNET_MESH_Handle *h,
549 struct GNUNET_MESH_TransmitHandle *th)
550{
551 GNUNET_CONTAINER_DLL_insert_tail (h->th_head, h->th_tail, th);
552 if (GNUNET_TIME_UNIT_FOREVER_ABS.abs_value_us == th->timeout.abs_value_us)
553 return;
554 th->timeout_task =
555 GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_absolute_get_remaining
556 (th->timeout), &timeout_transmission, th);
557}
558
559
560/**
561 * Auxiliary function to send an already constructed packet to the service.
562 * Takes care of creating a new queue element, copying the message and
563 * calling the tmt_rdy function if necessary.
564 *
565 * @param h mesh handle
566 * @param msg message to transmit
567 * @param channel channel this send is related to (NULL if N/A)
568 */
569static void
570send_packet (struct GNUNET_MESH_Handle *h,
571 const struct GNUNET_MessageHeader *msg,
572 struct GNUNET_MESH_Channel *channel);
573
574
575/**
576 * Send an ack on the channel to confirm the processing of a message.
577 *
578 * @param ch Channel on which to send the ACK.
579 */
580static void
581send_ack (struct GNUNET_MESH_Channel *ch)
582{
583 struct GNUNET_MESH_LocalAck msg;
584
585 LOG (GNUNET_ERROR_TYPE_DEBUG, "Sending ACK on channel %X\n", ch->chid);
586 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK);
587 msg.header.size = htons (sizeof (msg));
588 msg.channel_id = htonl (ch->chid);
589
590 send_packet (ch->mesh, &msg.header, ch);
591 return;
592}
593
594
595
596/**
597 * Reconnect callback: tries to reconnect again after a failer previous
598 * reconnecttion
599 * @param cls closure (mesh handle)
600 * @param tc task context
601 */
602static void
603reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc);
604
605
606/**
607 * Send a connect packet to the service with the applications and types
608 * requested by the user.
609 *
610 * @param h The mesh handle.
611 *
612 */
613static void
614send_connect (struct GNUNET_MESH_Handle *h)
615{
616 size_t size;
617
618 size = sizeof (struct GNUNET_MESH_ClientConnect);
619 size += h->n_ports * sizeof (uint32_t);
620 {
621 char buf[size] GNUNET_ALIGN;
622 struct GNUNET_MESH_ClientConnect *msg;
623 uint32_t *ports;
624 uint16_t i;
625
626 /* build connection packet */
627 msg = (struct GNUNET_MESH_ClientConnect *) buf;
628 msg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT);
629 msg->header.size = htons (size);
630 ports = (uint32_t *) &msg[1];
631 for (i = 0; i < h->n_ports; i++)
632 {
633 ports[i] = htonl (h->ports[i]);
634 LOG (GNUNET_ERROR_TYPE_DEBUG, " port %u\n",
635 h->ports[i]);
636 }
637 LOG (GNUNET_ERROR_TYPE_DEBUG,
638 "Sending %lu bytes long message with %u ports\n",
639 ntohs (msg->header.size), h->n_ports);
640 send_packet (h, &msg->header, NULL);
641 }
642}
643
644
645/**
646 * Reconnect to the service, retransmit all infomation to try to restore the
647 * original state.
648 *
649 * @param h handle to the mesh
650 *
651 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
652 */
653static int
654do_reconnect (struct GNUNET_MESH_Handle *h)
655{
656 struct GNUNET_MESH_Channel *ch;
657
658 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
659 LOG (GNUNET_ERROR_TYPE_DEBUG, "******* RECONNECT *******\n");
660 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
661 LOG (GNUNET_ERROR_TYPE_DEBUG, "******** on %p *******\n", h);
662 LOG (GNUNET_ERROR_TYPE_DEBUG, "*****************************\n");
663
664 /* disconnect */
665 if (NULL != h->th)
666 {
667 GNUNET_CLIENT_notify_transmit_ready_cancel (h->th);
668 h->th = NULL;
669 }
670 if (NULL != h->client)
671 {
672 GNUNET_CLIENT_disconnect (h->client);
673 }
674
675 /* connect again */
676 h->client = GNUNET_CLIENT_connect ("mesh", h->cfg);
677 if (h->client == NULL)
678 {
679 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
680 &reconnect_cbk, h);
681 h->reconnect_time =
682 GNUNET_TIME_relative_min (GNUNET_TIME_UNIT_SECONDS,
683 GNUNET_TIME_relative_multiply
684 (h->reconnect_time, 2));
685 LOG (GNUNET_ERROR_TYPE_DEBUG, "Next retry in %s\n",
686 GNUNET_STRINGS_relative_time_to_string (h->reconnect_time,
687 GNUNET_NO));
688 GNUNET_break (0);
689 return GNUNET_NO;
690 }
691 else
692 {
693 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
694 }
695 send_connect (h);
696 /* Rebuild all channels */
697 for (ch = h->channels_head; NULL != ch; ch = ch->next)
698 {
699 struct GNUNET_MESH_ChannelMessage tmsg;
700 uint32_t options;
701
702 if (ch->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
703 {
704 /* Channel was created by service (incoming channel) */
705 /* TODO: Notify service of missing channel, to request
706 * creator to recreate path (find a path to him via DHT?)
707 */
708 continue;
709 }
710 ch->allow_send = GNUNET_NO;
711 tmsg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
712 tmsg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
713 tmsg.channel_id = htonl (ch->chid);
714 tmsg.port = htonl (ch->port);
715 GNUNET_PEER_resolve (ch->peer, &tmsg.peer);
716
717 options = 0;
718 if (GNUNET_YES == ch->nobuffer)
719 options |= GNUNET_MESH_OPTION_NOBUFFER;
720
721 if (GNUNET_YES == ch->reliable)
722 options |= GNUNET_MESH_OPTION_RELIABLE;
723
724 tmsg.opt = htonl (options);
725 send_packet (h, &tmsg.header, ch);
726 }
727 return GNUNET_YES;
728}
729
730/**
731 * Reconnect callback: tries to reconnect again after a failer previous
732 * reconnecttion
733 * @param cls closure (mesh handle)
734 * @param tc task context
735 */
736static void
737reconnect_cbk (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
738{
739 struct GNUNET_MESH_Handle *h = cls;
740
741 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
742 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
743 return;
744 do_reconnect (h);
745}
746
747
748/**
749 * Reconnect to the service, retransmit all infomation to try to restore the
750 * original state.
751 *
752 * @param h handle to the mesh
753 *
754 * @return GNUNET_YES in case of sucess, GNUNET_NO otherwise (service down...)
755 */
756static void
757reconnect (struct GNUNET_MESH_Handle *h)
758{
759 LOG (GNUNET_ERROR_TYPE_DEBUG, "Requested RECONNECT\n");
760 h->in_receive = GNUNET_NO;
761 if (GNUNET_SCHEDULER_NO_TASK == h->reconnect_task)
762 h->reconnect_task = GNUNET_SCHEDULER_add_delayed (h->reconnect_time,
763 &reconnect_cbk, h);
764}
765
766
767/******************************************************************************/
768/*********************** RECEIVE HANDLERS ****************************/
769/******************************************************************************/
770
771/**
772 * Process the new channel notification and add it to the channels in the handle
773 *
774 * @param h The mesh handle
775 * @param msg A message with the details of the new incoming channel
776 */
777static void
778process_channel_created (struct GNUNET_MESH_Handle *h,
779 const struct GNUNET_MESH_ChannelMessage *msg)
780{
781 struct GNUNET_MESH_Channel *ch;
782 MESH_ChannelNumber chid;
783 uint32_t port;
784
785 chid = ntohl (msg->channel_id);
786 port = ntohl (msg->port);
787 LOG (GNUNET_ERROR_TYPE_DEBUG, "Creating incoming channel %X:%u\n", chid, port);
788 if (chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
789 {
790 GNUNET_break (0);
791 return;
792 }
793 if (NULL != h->new_channel)
794 {
795 ch = create_channel (h, chid);
796 ch->allow_send = GNUNET_NO;
797 ch->peer = GNUNET_PEER_intern (&msg->peer);
798 ch->mesh = h;
799 ch->chid = chid;
800 ch->port = port;
801 if (0 != (msg->opt & GNUNET_MESH_OPTION_NOBUFFER))
802 ch->nobuffer = GNUNET_YES;
803 else
804 ch->nobuffer = GNUNET_NO;
805
806 if (0 != (msg->opt & GNUNET_MESH_OPTION_RELIABLE))
807 ch->reliable = GNUNET_YES;
808 else
809 ch->reliable = GNUNET_NO;
810
811 if (GNUNET_YES == ch->reliable &&
812 0 != (msg->opt & GNUNET_MESH_OPTION_OOORDER))
813 ch->ooorder = GNUNET_YES;
814 else
815 ch->ooorder = GNUNET_NO;
816
817 LOG (GNUNET_ERROR_TYPE_DEBUG, " created channel %p\n", ch);
818 ch->ctx = h->new_channel (h->cls, ch, &msg->peer, ch->port);
819 LOG (GNUNET_ERROR_TYPE_DEBUG, "User notified\n");
820 }
821 else
822 {
823 struct GNUNET_MESH_ChannelMessage d_msg;
824
825 LOG (GNUNET_ERROR_TYPE_DEBUG, "No handler for incoming channels\n");
826
827 d_msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
828 d_msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
829 d_msg.channel_id = msg->channel_id;
830 memset (&d_msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
831 d_msg.port = 0;
832 d_msg.opt = 0;
833
834 send_packet (h, &d_msg.header, NULL);
835 }
836 return;
837}
838
839
840/**
841 * Process the channel destroy notification and free associated resources
842 *
843 * @param h The mesh handle
844 * @param msg A message with the details of the channel being destroyed
845 */
846static void
847process_channel_destroy (struct GNUNET_MESH_Handle *h,
848 const struct GNUNET_MESH_ChannelMessage *msg)
849{
850 struct GNUNET_MESH_Channel *ch;
851 MESH_ChannelNumber chid;
852
853 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying channel from service\n");
854 chid = ntohl (msg->channel_id);
855 ch = retrieve_channel (h, chid);
856
857 if (NULL == ch)
858 {
859 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X unknown\n", chid);
860 return;
861 }
862 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X destroyed\n", ch->chid);
863 destroy_channel (ch, GNUNET_YES);
864}
865
866
867/**
868 * Process the incoming data packets, call appropriate handlers.
869 *
870 * @param h The mesh handle
871 * @param message A message encapsulating the data
872 */
873static void
874process_incoming_data (struct GNUNET_MESH_Handle *h,
875 const struct GNUNET_MessageHeader *message)
876{
877 const struct GNUNET_MessageHeader *payload;
878 const struct GNUNET_MESH_MessageHandler *handler;
879 struct GNUNET_MESH_LocalData *dmsg;
880 struct GNUNET_MESH_Channel *ch;
881 unsigned int i;
882 uint16_t type;
883
884 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got a data message!\n");
885
886 dmsg = (struct GNUNET_MESH_LocalData *) message;
887
888 ch = retrieve_channel (h, ntohl (dmsg->id));
889 payload = (struct GNUNET_MessageHeader *) &dmsg[1];
890 LOG (GNUNET_ERROR_TYPE_DEBUG, " %s data on channel %s [%X]\n",
891 ch->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV ? "fwd" : "bck",
892 GNUNET_i2s (GNUNET_PEER_resolve2 (ch->peer)), ntohl (dmsg->id));
893 if (NULL == ch)
894 {
895 /* Channel was ignored/destroyed, probably service didn't get it yet */
896 LOG (GNUNET_ERROR_TYPE_DEBUG, " ignored!\n");
897 return;
898 }
899 type = ntohs (payload->type);
900 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload type %u\n", type);
901 for (i = 0; i < h->n_handlers; i++)
902 {
903 handler = &h->message_handlers[i];
904 LOG (GNUNET_ERROR_TYPE_DEBUG,
905 " checking handler for type %u\n",
906 handler->type);
907 if (handler->type == type)
908 {
909 if (GNUNET_OK !=
910 handler->callback (h->cls, ch, &ch->ctx, payload))
911 {
912 LOG (GNUNET_ERROR_TYPE_DEBUG, "callback caused disconnection\n");
913 GNUNET_MESH_channel_destroy (ch);
914 return;
915 }
916 else
917 {
918 LOG (GNUNET_ERROR_TYPE_DEBUG,
919 "callback completed successfully\n");
920 }
921 }
922 }
923}
924
925
926/**
927 * Process a local ACK message, enabling the client to send
928 * more data to the service.
929 *
930 * @param h Mesh handle.
931 * @param message Message itself.
932 */
933static void
934process_ack (struct GNUNET_MESH_Handle *h,
935 const struct GNUNET_MessageHeader *message)
936{
937 struct GNUNET_MESH_LocalAck *msg;
938 struct GNUNET_MESH_Channel *ch;
939 MESH_ChannelNumber chid;
940
941 LOG (GNUNET_ERROR_TYPE_DEBUG, "Got an ACK!\n");
942 msg = (struct GNUNET_MESH_LocalAck *) message;
943 chid = ntohl (msg->channel_id);
944 ch = retrieve_channel (h, chid);
945 if (NULL == ch)
946 {
947 LOG (GNUNET_ERROR_TYPE_WARNING, "ACK on unknown channel %X\n", chid);
948 return;
949 }
950 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X!\n", ch->chid);
951 ch->allow_send = GNUNET_YES;
952 if (NULL == h->th && 0 < ch->packet_size)
953 {
954 LOG (GNUNET_ERROR_TYPE_DEBUG, " tmt rdy was NULL, requesting!\n");
955 h->th =
956 GNUNET_CLIENT_notify_transmit_ready (h->client, ch->packet_size,
957 GNUNET_TIME_UNIT_FOREVER_REL,
958 GNUNET_YES, &send_callback, h);
959 }
960}
961
962
963/*
964 * Process a local reply about info on all channels, pass info to the user.
965 *
966 * @param h Mesh handle.
967 * @param message Message itself.
968 */
969// static void
970// process_get_channels (struct GNUNET_MESH_Handle *h,
971// const struct GNUNET_MessageHeader *message)
972// {
973// struct GNUNET_MESH_LocalMonitor *msg;
974//
975// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Get Channels messasge received\n");
976//
977// if (NULL == h->channels_cb)
978// {
979// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
980// return;
981// }
982//
983// msg = (struct GNUNET_MESH_LocalMonitor *) message;
984// if (ntohs (message->size) !=
985// (sizeof (struct GNUNET_MESH_LocalMonitor) +
986// sizeof (struct GNUNET_PeerIdentity)))
987// {
988// GNUNET_break_op (0);
989// GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
990// "Get channels message: size %hu - expected %u\n",
991// ntohs (message->size),
992// sizeof (struct GNUNET_MESH_LocalMonitor));
993// return;
994// }
995// h->channels_cb (h->channels_cls,
996// ntohl (msg->channel_id),
997// &msg->owner,
998// &msg->destination);
999// }
1000
1001
1002
1003/*
1004 * Process a local monitor_channel reply, pass info to the user.
1005 *
1006 * @param h Mesh handle.
1007 * @param message Message itself.
1008 */
1009// static void
1010// process_show_channel (struct GNUNET_MESH_Handle *h,
1011// const struct GNUNET_MessageHeader *message)
1012// {
1013// struct GNUNET_MESH_LocalMonitor *msg;
1014// size_t esize;
1015//
1016// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Show Channel messasge received\n");
1017//
1018// if (NULL == h->channel_cb)
1019// {
1020// GNUNET_log (GNUNET_ERROR_TYPE_ERROR, " ignored\n");
1021// return;
1022// }
1023//
1024// /* Verify message sanity */
1025// msg = (struct GNUNET_MESH_LocalMonitor *) message;
1026// esize = sizeof (struct GNUNET_MESH_LocalMonitor);
1027// if (ntohs (message->size) != esize)
1028// {
1029// GNUNET_break_op (0);
1030// GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1031// "Show channel message: size %hu - expected %u\n",
1032// ntohs (message->size),
1033// esize);
1034//
1035// h->channel_cb (h->channel_cls, NULL, NULL);
1036// h->channel_cb = NULL;
1037// h->channel_cls = NULL;
1038//
1039// return;
1040// }
1041//
1042// h->channel_cb (h->channel_cls,
1043// &msg->destination,
1044// &msg->owner);
1045// }
1046
1047
1048/**
1049 * Function to process all messages received from the service
1050 *
1051 * @param cls closure
1052 * @param msg message received, NULL on timeout or fatal error
1053 */
1054static void
1055msg_received (void *cls, const struct GNUNET_MessageHeader *msg)
1056{
1057 struct GNUNET_MESH_Handle *h = cls;
1058 uint16_t type;
1059
1060 if (msg == NULL)
1061 {
1062 LOG (GNUNET_ERROR_TYPE_DEBUG,
1063 "Mesh service disconnected, reconnecting\n", h);
1064 reconnect (h);
1065 return;
1066 }
1067 type = ntohs (msg->type);
1068 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1069 LOG (GNUNET_ERROR_TYPE_DEBUG, "Received a message: %s\n",
1070 GNUNET_MESH_DEBUG_M2S (type));
1071 switch (type)
1072 {
1073 /* Notify of a new incoming channel */
1074 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1075 process_channel_created (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1076 break;
1077 /* Notify of a channel disconnection */
1078 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1079 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_NACK:
1080 process_channel_destroy (h, (struct GNUNET_MESH_ChannelMessage *) msg);
1081 break;
1082 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA:
1083 process_incoming_data (h, msg);
1084 break;
1085 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_ACK:
1086 process_ack (h, msg);
1087 break;
1088// case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS: DEPRECATED
1089// process_get_channels (h, msg);
1090// break;
1091// case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL: DEPRECATED
1092// process_show_channel (h, msg);
1093// break;
1094 default:
1095 /* We shouldn't get any other packages, log and ignore */
1096 LOG (GNUNET_ERROR_TYPE_WARNING,
1097 "unsolicited message form service (type %s)\n",
1098 GNUNET_MESH_DEBUG_M2S (ntohs (msg->type)));
1099 }
1100 LOG (GNUNET_ERROR_TYPE_DEBUG, "message processed\n");
1101 if (GNUNET_YES == h->in_receive)
1102 {
1103 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1104 GNUNET_TIME_UNIT_FOREVER_REL);
1105 }
1106 else
1107 {
1108 LOG (GNUNET_ERROR_TYPE_DEBUG,
1109 "in receive off, not calling CLIENT_receive\n");
1110 }
1111}
1112
1113
1114/******************************************************************************/
1115/************************ SEND FUNCTIONS ****************************/
1116/******************************************************************************/
1117
1118/**
1119 * Function called to send a message to the service.
1120 * "buf" will be NULL and "size" zero if the socket was closed for writing in
1121 * the meantime.
1122 *
1123 * @param cls closure, the mesh handle
1124 * @param size number of bytes available in buf
1125 * @param buf where the callee should write the connect message
1126 * @return number of bytes written to buf
1127 */
1128static size_t
1129send_callback (void *cls, size_t size, void *buf)
1130{
1131 struct GNUNET_MESH_Handle *h = cls;
1132 struct GNUNET_MESH_TransmitHandle *th;
1133 struct GNUNET_MESH_TransmitHandle *next;
1134 struct GNUNET_MESH_Channel *ch;
1135 char *cbuf = buf;
1136 size_t tsize;
1137 size_t psize;
1138 size_t nsize;
1139
1140 LOG (GNUNET_ERROR_TYPE_DEBUG, "\n");
1141 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() Buffer %u\n", size);
1142 if ((0 == size) || (NULL == buf))
1143 {
1144 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Received NULL send callback on %p\n", h);
1145 reconnect (h);
1146 h->th = NULL;
1147 return 0;
1148 }
1149 tsize = 0;
1150 next = h->th_head;
1151 nsize = message_ready_size (h);
1152 while ((NULL != (th = next)) && (0 < nsize) && (size >= nsize))
1153 {
1154 ch = th->channel;
1155 if (GNUNET_YES == th_is_payload (th))
1156 {
1157 struct GNUNET_MESH_LocalData *dmsg;
1158 struct GNUNET_MessageHeader *mh;
1159
1160 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload\n");
1161 if (GNUNET_NO == ch->allow_send)
1162 {
1163 /* This channel is not ready to transmit yet, try next message */
1164 next = th->next;
1165 continue;
1166 }
1167 ch->packet_size = 0;
1168 GNUNET_assert (size >= th->size);
1169 dmsg = (struct GNUNET_MESH_LocalData *) cbuf;
1170 mh = (struct GNUNET_MessageHeader *) &dmsg[1];
1171 psize = th->notify (th->notify_cls,
1172 size - sizeof (struct GNUNET_MESH_LocalData),
1173 mh);
1174 if (psize > 0)
1175 {
1176 psize += sizeof (struct GNUNET_MESH_LocalData);
1177 GNUNET_assert (size >= psize);
1178 dmsg->header.size = htons (psize);
1179 dmsg->id = htonl (ch->chid);
1180 dmsg->header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_DATA);
1181 LOG (GNUNET_ERROR_TYPE_DEBUG, "# payload type %s\n",
1182 GNUNET_MESH_DEBUG_M2S (ntohs (mh->type)));
1183 ch->allow_send = GNUNET_NO;
1184 }
1185 else
1186 {
1187 LOG (GNUNET_ERROR_TYPE_DEBUG,
1188 "# callback returned size 0, "
1189 "application canceled transmission\n");
1190 }
1191 }
1192 else
1193 {
1194 struct GNUNET_MessageHeader *mh = (struct GNUNET_MessageHeader *) &th[1];
1195
1196 LOG (GNUNET_ERROR_TYPE_DEBUG, "# mesh internal traffic, type %s\n",
1197 GNUNET_MESH_DEBUG_M2S (ntohs (mh->type)));
1198 memcpy (cbuf, &th[1], th->size);
1199 psize = th->size;
1200 }
1201 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1202 GNUNET_SCHEDULER_cancel (th->timeout_task);
1203 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1204 GNUNET_free (th);
1205 next = h->th_head;
1206 nsize = message_ready_size (h);
1207 cbuf += psize;
1208 size -= psize;
1209 tsize += psize;
1210 }
1211 LOG (GNUNET_ERROR_TYPE_DEBUG, "# total size: %u\n", tsize);
1212 h->th = NULL;
1213 size = message_ready_size (h);
1214 if (0 != size)
1215 {
1216 LOG (GNUNET_ERROR_TYPE_DEBUG, "# next size: %u\n", size);
1217 h->th =
1218 GNUNET_CLIENT_notify_transmit_ready (h->client, size,
1219 GNUNET_TIME_UNIT_FOREVER_REL,
1220 GNUNET_YES, &send_callback, h);
1221 }
1222 else
1223 {
1224 if (NULL != h->th_head)
1225 LOG (GNUNET_ERROR_TYPE_DEBUG, "# can't transmit any more\n");
1226 else
1227 LOG (GNUNET_ERROR_TYPE_DEBUG, "# nothing left to transmit\n");
1228 }
1229 if (GNUNET_NO == h->in_receive)
1230 {
1231 LOG (GNUNET_ERROR_TYPE_DEBUG, "# start receiving from service\n");
1232 h->in_receive = GNUNET_YES;
1233 GNUNET_CLIENT_receive (h->client, &msg_received, h,
1234 GNUNET_TIME_UNIT_FOREVER_REL);
1235 }
1236 LOG (GNUNET_ERROR_TYPE_DEBUG, "# Send packet() END\n");
1237 return tsize;
1238}
1239
1240
1241/**
1242 * Auxiliary function to send an already constructed packet to the service.
1243 * Takes care of creating a new queue element, copying the message and
1244 * calling the tmt_rdy function if necessary.
1245 *
1246 * @param h mesh handle
1247 * @param msg message to transmit
1248 * @param channel channel this send is related to (NULL if N/A)
1249 */
1250static void
1251send_packet (struct GNUNET_MESH_Handle *h,
1252 const struct GNUNET_MessageHeader *msg,
1253 struct GNUNET_MESH_Channel *channel)
1254{
1255 struct GNUNET_MESH_TransmitHandle *th;
1256 size_t msize;
1257
1258 LOG (GNUNET_ERROR_TYPE_DEBUG, " Sending message to service: %s\n",
1259 GNUNET_MESH_DEBUG_M2S(ntohs(msg->type)));
1260 msize = ntohs (msg->size);
1261 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle) + msize);
1262 th->timeout = GNUNET_TIME_UNIT_FOREVER_ABS;
1263 th->size = msize;
1264 th->channel = channel;
1265 memcpy (&th[1], msg, msize);
1266 add_to_queue (h, th);
1267 LOG (GNUNET_ERROR_TYPE_DEBUG, " queued\n");
1268 if (NULL != h->th)
1269 return;
1270 LOG (GNUNET_ERROR_TYPE_DEBUG, " calling ntfy tmt rdy for %u bytes\n", msize);
1271 h->th =
1272 GNUNET_CLIENT_notify_transmit_ready (h->client, msize,
1273 GNUNET_TIME_UNIT_FOREVER_REL,
1274 GNUNET_YES, &send_callback, h);
1275}
1276
1277
1278/******************************************************************************/
1279/********************** API CALL DEFINITIONS *************************/
1280/******************************************************************************/
1281
1282struct GNUNET_MESH_Handle *
1283GNUNET_MESH_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, void *cls,
1284 GNUNET_MESH_InboundChannelNotificationHandler new_channel,
1285 GNUNET_MESH_ChannelEndHandler cleaner,
1286 const struct GNUNET_MESH_MessageHandler *handlers,
1287 const uint32_t *ports)
1288{
1289 struct GNUNET_MESH_Handle *h;
1290
1291 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect()\n");
1292 h = GNUNET_malloc (sizeof (struct GNUNET_MESH_Handle));
1293 LOG (GNUNET_ERROR_TYPE_DEBUG, " addr %p\n", h);
1294 h->cfg = cfg;
1295 h->new_channel = new_channel;
1296 h->cleaner = cleaner;
1297 h->client = GNUNET_CLIENT_connect ("mesh", cfg);
1298 if (h->client == NULL)
1299 {
1300 GNUNET_break (0);
1301 GNUNET_free (h);
1302 return NULL;
1303 }
1304 h->cls = cls;
1305 h->message_handlers = handlers;
1306 h->ports = ports;
1307 h->next_chid = GNUNET_MESH_LOCAL_CHANNEL_ID_CLI;
1308 h->reconnect_time = GNUNET_TIME_UNIT_MILLISECONDS;
1309 h->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1310
1311 if (NULL != ports && ports[0] != 0 && NULL == new_channel)
1312 {
1313 GNUNET_break (0);
1314 LOG (GNUNET_ERROR_TYPE_DEBUG,
1315 "no new channel handler given, ports parameter is useless!!\n");
1316 }
1317 if ((NULL == ports || ports[0] == 0) && NULL != new_channel)
1318 {
1319 GNUNET_break (0);
1320 LOG (GNUNET_ERROR_TYPE_DEBUG,
1321 "no ports given, new channel handler will never be called!!\n");
1322 }
1323 /* count handlers */
1324 for (h->n_handlers = 0;
1325 handlers && handlers[h->n_handlers].type;
1326 h->n_handlers++) ;
1327 for (h->n_ports = 0;
1328 ports && ports[h->n_ports];
1329 h->n_ports++) ;
1330 send_connect (h);
1331 LOG (GNUNET_ERROR_TYPE_DEBUG, "GNUNET_MESH_connect() END\n");
1332 return h;
1333}
1334
1335
1336void
1337GNUNET_MESH_disconnect (struct GNUNET_MESH_Handle *handle)
1338{
1339 struct GNUNET_MESH_Channel *ch;
1340 struct GNUNET_MESH_Channel *aux;
1341 struct GNUNET_MESH_TransmitHandle *th;
1342
1343 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH DISCONNECT\n");
1344
1345 ch = handle->channels_head;
1346 while (NULL != ch)
1347 {
1348 aux = ch->next;
1349 if (ch->chid < GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1350 {
1351 GNUNET_break (0);
1352 LOG (GNUNET_ERROR_TYPE_DEBUG, "channel %X not destroyed\n", ch->chid);
1353 }
1354 destroy_channel (ch, GNUNET_YES);
1355 ch = aux;
1356 }
1357 while ( (th = handle->th_head) != NULL)
1358 {
1359 struct GNUNET_MessageHeader *msg;
1360
1361 /* Make sure it is an allowed packet (everything else should have been
1362 * already canceled).
1363 */
1364 GNUNET_break (GNUNET_NO == th_is_payload (th));
1365 msg = (struct GNUNET_MessageHeader *) &th[1];
1366 switch (ntohs(msg->type))
1367 {
1368 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_CONNECT:
1369 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE:
1370 case GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY:
1371 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS:
1372 case GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL:
1373 break;
1374 default:
1375 GNUNET_break (0);
1376 LOG (GNUNET_ERROR_TYPE_ERROR, "unexpected msg %u\n",
1377 ntohs(msg->type));
1378 }
1379
1380 GNUNET_CONTAINER_DLL_remove (handle->th_head, handle->th_tail, th);
1381 GNUNET_free (th);
1382 }
1383
1384 if (NULL != handle->th)
1385 {
1386 GNUNET_CLIENT_notify_transmit_ready_cancel (handle->th);
1387 handle->th = NULL;
1388 }
1389 if (NULL != handle->client)
1390 {
1391 GNUNET_CLIENT_disconnect (handle->client);
1392 handle->client = NULL;
1393 }
1394 if (GNUNET_SCHEDULER_NO_TASK != handle->reconnect_task)
1395 {
1396 GNUNET_SCHEDULER_cancel(handle->reconnect_task);
1397 handle->reconnect_task = GNUNET_SCHEDULER_NO_TASK;
1398 }
1399 GNUNET_free (handle);
1400}
1401
1402
1403/**
1404 * Create a new channel towards a remote peer.
1405 *
1406 * If the destination port is not open by any peer or the destination peer
1407 * does not accept the channel, #GNUNET_MESH_ChannelEndHandler will be called
1408 * for this channel.
1409 *
1410 * @param h mesh handle
1411 * @param channel_ctx client's channel context to associate with the channel
1412 * @param peer peer identity the channel should go to
1413 * @param port Port number.
1414 * @param nobuffer Flag for disabling buffering on relay nodes.
1415 * @param reliable Flag for end-to-end reliability.
1416 *
1417 * @return handle to the channel
1418 */
1419struct GNUNET_MESH_Channel *
1420GNUNET_MESH_channel_create (struct GNUNET_MESH_Handle *h,
1421 void *channel_ctx,
1422 const struct GNUNET_PeerIdentity *peer,
1423 uint32_t port,
1424 int nobuffer,
1425 int reliable)
1426{
1427 struct GNUNET_MESH_Channel *ch;
1428 struct GNUNET_MESH_ChannelMessage msg;
1429
1430 LOG (GNUNET_ERROR_TYPE_DEBUG,
1431 "Creating new channel to %s:%u\n",
1432 GNUNET_i2s (peer), port);
1433 ch = create_channel (h, 0);
1434 LOG (GNUNET_ERROR_TYPE_DEBUG, " at %p\n", ch);
1435 LOG (GNUNET_ERROR_TYPE_DEBUG, " number %X\n", ch->chid);
1436 ch->ctx = channel_ctx;
1437 ch->peer = GNUNET_PEER_intern (peer);
1438 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_CREATE);
1439 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1440 msg.channel_id = htonl (ch->chid);
1441 msg.port = htonl (port);
1442 msg.peer = *peer;
1443 msg.opt = 0;
1444 if (GNUNET_YES == reliable)
1445 msg.opt |= GNUNET_MESH_OPTION_RELIABLE;
1446 if (GNUNET_YES == nobuffer)
1447 msg.opt |= GNUNET_MESH_OPTION_NOBUFFER;
1448 msg.opt = htonl (msg.opt);
1449 ch->allow_send = 0;
1450 send_packet (h, &msg.header, ch);
1451 return ch;
1452}
1453
1454
1455void
1456GNUNET_MESH_channel_destroy (struct GNUNET_MESH_Channel *channel)
1457{
1458 struct GNUNET_MESH_Handle *h;
1459 struct GNUNET_MESH_ChannelMessage msg;
1460 struct GNUNET_MESH_TransmitHandle *th;
1461
1462 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying channel\n");
1463 h = channel->mesh;
1464
1465 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_CHANNEL_DESTROY);
1466 msg.header.size = htons (sizeof (struct GNUNET_MESH_ChannelMessage));
1467 msg.channel_id = htonl (channel->chid);
1468 memset (&msg.peer, 0, sizeof (struct GNUNET_PeerIdentity));
1469 msg.port = 0;
1470 msg.opt = 0;
1471 th = h->th_head;
1472 while (th != NULL)
1473 {
1474 struct GNUNET_MESH_TransmitHandle *aux;
1475 if (th->channel == channel)
1476 {
1477 aux = th->next;
1478 /* FIXME call the handler? */
1479 if (GNUNET_YES == th_is_payload (th))
1480 th->notify (th->notify_cls, 0, NULL);
1481 GNUNET_CONTAINER_DLL_remove (h->th_head, h->th_tail, th);
1482 GNUNET_free (th);
1483 th = aux;
1484 }
1485 else
1486 th = th->next;
1487 }
1488
1489 destroy_channel (channel, GNUNET_YES);
1490 send_packet (h, &msg.header, NULL);
1491}
1492
1493
1494/**
1495 * Get information about a channel.
1496 *
1497 * @param channel Channel handle.
1498 * @param option Query (GNUNET_MESH_OPTION_*).
1499 * @param ... dependant on option, currently not used
1500 *
1501 * @return Union with an answer to the query.
1502 */
1503const union GNUNET_MESH_ChannelInfo *
1504GNUNET_MESH_channel_get_info (struct GNUNET_MESH_Channel *channel,
1505 enum MeshOption option, ...)
1506{
1507 const union GNUNET_MESH_ChannelInfo *ret;
1508
1509 switch (option)
1510 {
1511 case GNUNET_MESH_OPTION_NOBUFFER:
1512 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->nobuffer;
1513 break;
1514 case GNUNET_MESH_OPTION_RELIABLE:
1515 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->reliable;
1516 break;
1517 case GNUNET_MESH_OPTION_OOORDER:
1518 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->ooorder;
1519 break;
1520 case GNUNET_MESH_OPTION_PEER:
1521 ret = (const union GNUNET_MESH_ChannelInfo *) &channel->peer;
1522 break;
1523 default:
1524 GNUNET_break (0);
1525 return NULL;
1526 }
1527
1528 return ret;
1529}
1530
1531struct GNUNET_MESH_TransmitHandle *
1532GNUNET_MESH_notify_transmit_ready (struct GNUNET_MESH_Channel *channel, int cork,
1533 struct GNUNET_TIME_Relative maxdelay,
1534 size_t notify_size,
1535 GNUNET_CONNECTION_TransmitReadyNotify notify,
1536 void *notify_cls)
1537{
1538 struct GNUNET_MESH_TransmitHandle *th;
1539
1540 GNUNET_assert (NULL != channel);
1541 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY\n");
1542 LOG (GNUNET_ERROR_TYPE_DEBUG, " on channel %X\n", channel->chid);
1543 LOG (GNUNET_ERROR_TYPE_DEBUG, " allow_send %d\n", channel->allow_send);
1544 if (channel->chid >= GNUNET_MESH_LOCAL_CHANNEL_ID_SERV)
1545 LOG (GNUNET_ERROR_TYPE_DEBUG, " to origin\n");
1546 else
1547 LOG (GNUNET_ERROR_TYPE_DEBUG, " to destination\n");
1548 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload size %u\n", notify_size);
1549 GNUNET_assert (NULL != notify);
1550 GNUNET_assert (0 == channel->packet_size); // Only one data packet allowed
1551 th = GNUNET_malloc (sizeof (struct GNUNET_MESH_TransmitHandle));
1552 th->channel = channel;
1553 th->timeout = GNUNET_TIME_relative_to_absolute (maxdelay);
1554 th->size = notify_size + sizeof (struct GNUNET_MESH_LocalData);
1555 channel->packet_size = th->size;
1556 LOG (GNUNET_ERROR_TYPE_DEBUG, " total size %u\n", th->size);
1557 th->notify = notify;
1558 th->notify_cls = notify_cls;
1559 add_to_queue (channel->mesh, th);
1560 if (NULL != channel->mesh->th)
1561 return th;
1562 if (GNUNET_NO == channel->allow_send)
1563 return th;
1564 LOG (GNUNET_ERROR_TYPE_DEBUG, " call client notify tmt rdy\n");
1565 channel->mesh->th =
1566 GNUNET_CLIENT_notify_transmit_ready (channel->mesh->client, th->size,
1567 GNUNET_TIME_UNIT_FOREVER_REL,
1568 GNUNET_YES, &send_callback,
1569 channel->mesh);
1570 LOG (GNUNET_ERROR_TYPE_DEBUG, "MESH NOTIFY TRANSMIT READY END\n");
1571 return th;
1572}
1573
1574
1575void
1576GNUNET_MESH_notify_transmit_ready_cancel (struct GNUNET_MESH_TransmitHandle *th)
1577{
1578 struct GNUNET_MESH_Handle *mesh;
1579
1580 th->channel->packet_size = 0;
1581 mesh = th->channel->mesh;
1582 if (th->timeout_task != GNUNET_SCHEDULER_NO_TASK)
1583 GNUNET_SCHEDULER_cancel (th->timeout_task);
1584 GNUNET_CONTAINER_DLL_remove (mesh->th_head, mesh->th_tail, th);
1585 GNUNET_free (th);
1586 if ((0 == message_ready_size (mesh)) && (NULL != mesh->th))
1587 {
1588 /* queue empty, no point in asking for transmission */
1589 GNUNET_CLIENT_notify_transmit_ready_cancel (mesh->th);
1590 mesh->th = NULL;
1591 }
1592}
1593
1594void
1595GNUNET_MESH_receive_done (struct GNUNET_MESH_Channel *channel)
1596{
1597 send_ack (channel);
1598}
1599
1600
1601/**
1602 * Request information about the running mesh peer.
1603 * The callback will be called for every channel known to the service,
1604 * listing all active peers that blong to the channel.
1605 *
1606 * If called again on the same handle, it will overwrite the previous
1607 * callback and cls. To retrieve the cls, monitor_cancel must be
1608 * called first.
1609 *
1610 * WARNING: unstable API, likely to change in the future!
1611 *
1612 * @param h Handle to the mesh peer.
1613 * @param callback Function to call with the requested data.
1614 * @param callback_cls Closure for @c callback.
1615 */
1616void
1617GNUNET_MESH_get_channels (struct GNUNET_MESH_Handle *h,
1618 GNUNET_MESH_ChannelsCB callback,
1619 void *callback_cls)
1620{
1621 struct GNUNET_MessageHeader msg;
1622
1623 msg.size = htons (sizeof (msg));
1624 msg.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNELS);
1625 send_packet (h, &msg, NULL);
1626 h->channels_cb = callback;
1627 h->channels_cls = callback_cls;
1628
1629 return;
1630}
1631
1632
1633/**
1634 * Cancel a monitor request. The monitor callback will not be called.
1635 *
1636 * @param h Mesh handle.
1637 *
1638 * @return Closure given to GNUNET_MESH_monitor, if any.
1639 */
1640void *
1641GNUNET_MESH_get_channels_cancel (struct GNUNET_MESH_Handle *h)
1642{
1643 void *cls;
1644
1645 cls = h->channels_cls;
1646 h->channels_cb = NULL;
1647 h->channels_cls = NULL;
1648 return cls;
1649}
1650
1651
1652/**
1653 * Request information about a specific channel of the running mesh peer.
1654 *
1655 * WARNING: unstable API, likely to change in the future!
1656 * FIXME Add destination option.
1657 *
1658 * @param h Handle to the mesh peer.
1659 * @param initiator ID of the owner of the channel.
1660 * @param channel_number Channel number.
1661 * @param callback Function to call with the requested data.
1662 * @param callback_cls Closure for @c callback.
1663 */
1664void
1665GNUNET_MESH_show_channel (struct GNUNET_MESH_Handle *h,
1666 struct GNUNET_PeerIdentity *initiator,
1667 unsigned int channel_number,
1668 GNUNET_MESH_ChannelCB callback,
1669 void *callback_cls)
1670{
1671 struct GNUNET_MESH_LocalMonitor msg;
1672
1673 msg.header.size = htons (sizeof (msg));
1674 msg.header.type = htons (GNUNET_MESSAGE_TYPE_MESH_LOCAL_INFO_CHANNEL);
1675 msg.owner = *initiator;
1676 msg.channel_id = htonl (channel_number);
1677 msg.reserved = 0;
1678 send_packet (h, &msg.header, NULL);
1679 h->channel_cb = callback;
1680 h->channel_cls = callback_cls;
1681
1682 return;
1683}
1684
1685
1686/**
1687 * Function called to notify a client about the connection
1688 * begin ready to queue more data. "buf" will be
1689 * NULL and "size" zero if the connection was closed for
1690 * writing in the meantime.
1691 *
1692 * @param cls closure
1693 * @param size number of bytes available in buf
1694 * @param buf where the callee should write the message
1695 * @return number of bytes written to buf
1696 */
1697static size_t
1698mesh_mq_ntr (void *cls, size_t size,
1699 void *buf)
1700{
1701 struct GNUNET_MQ_Handle *mq = cls;
1702 struct MeshMQState *state = GNUNET_MQ_impl_state (mq);
1703 const struct GNUNET_MessageHeader *msg = GNUNET_MQ_impl_current (mq);
1704 uint16_t msize;
1705
1706 state->th = NULL;
1707 if (NULL == buf)
1708 {
1709 GNUNET_MQ_inject_error (mq, GNUNET_MQ_ERROR_WRITE);
1710 return 0;
1711 }
1712 msize = ntohs (msg->size);
1713 GNUNET_assert (msize <= size);
1714 memcpy (buf, msg, msize);
1715 GNUNET_MQ_impl_send_continue (mq);
1716 return msize;
1717}
1718
1719
1720/**
1721 * Signature of functions implementing the
1722 * sending functionality of a message queue.
1723 *
1724 * @param mq the message queue
1725 * @param msg the message to send
1726 * @param impl_state state of the implementation
1727 */
1728static void
1729mesh_mq_send_impl (struct GNUNET_MQ_Handle *mq,
1730 const struct GNUNET_MessageHeader *msg, void *impl_state)
1731{
1732 struct MeshMQState *state = impl_state;
1733
1734 GNUNET_assert (NULL == state->th);
1735 GNUNET_MQ_impl_send_commit (mq);
1736 state->th =
1737 GNUNET_MESH_notify_transmit_ready (state->channel,
1738 /* FIXME: add option for corking */
1739 GNUNET_NO,
1740 GNUNET_TIME_UNIT_FOREVER_REL,
1741 ntohs (msg->size),
1742 mesh_mq_ntr, mq);
1743
1744}
1745
1746
1747/**
1748 * Signature of functions implementing the
1749 * destruction of a message queue.
1750 * Implementations must not free 'mq', but should
1751 * take care of 'impl_state'.
1752 *
1753 * @param mq the message queue to destroy
1754 * @param impl_state state of the implementation
1755 */
1756static void
1757mesh_mq_destroy_impl (struct GNUNET_MQ_Handle *mq, void *impl_state)
1758{
1759 struct MeshMQState *state = impl_state;
1760
1761 if (NULL != state->th)
1762 GNUNET_MESH_notify_transmit_ready_cancel (state->th);
1763
1764 GNUNET_free (state);
1765}
1766
1767
1768/**
1769 * Create a message queue for a mesh channel.
1770 * The message queue can only be used to transmit messages,
1771 * not to receive them.
1772 *
1773 * @param channel the channel to create the message qeue for
1774 * @return a message queue to messages over the channel
1775 */
1776struct GNUNET_MQ_Handle *
1777GNUNET_MESH_mq_create (struct GNUNET_MESH_Channel *channel)
1778{
1779 struct GNUNET_MQ_Handle *mq;
1780 struct MeshMQState *state;
1781
1782 state = GNUNET_new (struct MeshMQState);
1783 state->channel = channel;
1784
1785 mq = GNUNET_MQ_queue_for_callbacks (mesh_mq_send_impl,
1786 mesh_mq_destroy_impl,
1787 NULL, /* FIXME: cancel impl. */
1788 state,
1789 NULL, /* no msg handlers */
1790 NULL, /* no err handlers */
1791 NULL); /* no handler cls */
1792 return mq;
1793}
1794
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 17:59:19 +0000