channel.c 32.7 KB
Newer Older
Niels Möller's avatar
Niels Möller committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
/* channel.c
 *
 * $Id$
 */

/* lsh, an implementation of the ssh protocol
 *
 * Copyright (C) 1998 Niels Mller
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "channel.h"

#include "format.h"
28
#include "io.h"
Niels Möller's avatar
Niels Möller committed
29
#include "read_data.h"
Niels Möller's avatar
Niels Möller committed
30
31
32
33
34
35
#include "service.h"
#include "ssh.h"
#include "werror.h"
#include "xalloc.h"

#include <assert.h>
36
#include <string.h>
Niels Möller's avatar
Niels Möller committed
37

38
39
40
41
#define CLASS_DEFINE
#include "channel.h.x"
#undef CLASS_DEFINE

42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
#include "channel.c.x"

/* CLASS:
   (class
     (name connection_service)
     (super ssh_service)
     (vars
       ; Supported global requests 
       (global_requests object alist)

       (channel_types object alist)

       ; Initialize connection (for instance, request channels to be 
       ; opened or services to be forwarded).

       (start object connection_startup)))
*/

/* CLASS:
   (class
     (name channel_handler)
     (super packet_handler)
     (vars
       (table object channel_table)))
*/

/* CLASS:
   (class
     (name global_request_handler)
     (super channel_handler super)
     (vars
       (global_requests object alist)))
*/

/* CLASS:
   (class
     (name channel_open_handler)
     (super channel_handler)
     (vars
       (channel_types object alist)))
*/

Niels Möller's avatar
Niels Möller committed
84
85
86
87
88
struct lsh_string *format_global_failure(void)
{
  return ssh_format("%c", SSH_MSG_REQUEST_FAILURE);
}

89
90
struct lsh_string *format_open_confirmation(struct ssh_channel *channel,
					    UINT32 channel_number,
91
					    const char *format, ...)
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
{
  va_list args;
  UINT32 l1, l2;
  struct lsh_string *packet;

#define CONFIRM_FORMAT "%c%i%i%i%i"
#define CONFIRM_ARGS SSH_MSG_CHANNEL_OPEN_CONFIRMATION, channel->channel_number, \
  channel_number, channel->rec_window_size, channel->rec_max_packet
    
  l1 = ssh_format_length(CONFIRM_FORMAT, CONFIRM_ARGS);

  va_start(args, format);
  l2 = ssh_vformat_length(format, args);
  va_end(args);

  packet = lsh_string_alloc(l1 + l2);

  ssh_format_write(CONFIRM_FORMAT, l1, packet->data, CONFIRM_ARGS);

  va_start(args, format);
112
  ssh_vformat_write(format, l2, packet->data+l1, args);
113
114
115
116
117
118
119
  va_end(args);

  return packet;
#undef CONFIRM_FORMAT
#undef CONFIRM_ARGS
}

Niels Möller's avatar
Niels Möller committed
120
struct lsh_string *format_open_failure(UINT32 channel, UINT32 reason,
121
				       const char *msg, const char *language)
Niels Möller's avatar
Niels Möller committed
122
123
124
125
126
{
  return ssh_format("%c%i%i%z%z", SSH_MSG_CHANNEL_OPEN_FAILURE,
		    channel, reason, msg, language);
}

127
128
129
130
131
struct lsh_string *format_channel_success(UINT32 channel)
{
  return ssh_format("%c%i", SSH_MSG_CHANNEL_SUCCESS, channel);
}

Niels Möller's avatar
Niels Möller committed
132
133
134
135
136
struct lsh_string *format_channel_failure(UINT32 channel)
{
  return ssh_format("%c%i", SSH_MSG_CHANNEL_FAILURE, channel);
}

137
138
139
140
141
142
143
144
145
146
struct lsh_string *prepare_window_adjust(struct ssh_channel *channel,
					 UINT32 add)
{
  channel->rec_window_size += add;
  
  return ssh_format("%c%i%i",
		    SSH_MSG_CHANNEL_WINDOW_ADJUST,
		    channel->channel_number, add);
}

147
/* Channel objects */
Niels Möller's avatar
Niels Möller committed
148
149
150
151
152

#define INITIAL_CHANNELS 32
/* Arbitrary limit */
#define MAX_CHANNELS (1L<<17)

Niels Möller's avatar
Niels Möller committed
153
struct channel_table *make_channel_table(void)
Niels Möller's avatar
Niels Möller committed
154
{
155
  NEW(channel_table, table);
Niels Möller's avatar
Niels Möller committed
156

157
  table->channels = lsh_space_alloc(sizeof(struct ssh_channel *)
158
				      * INITIAL_CHANNELS);
159
160
161
162
  table->allocated_channels = INITIAL_CHANNELS;
  table->next_channel = 0;
  table->used_channels = 0;
  table->max_channels = MAX_CHANNELS;
Niels Möller's avatar
Niels Möller committed
163

Niels Möller's avatar
Niels Möller committed
164
165
  table->pending_close = 0;
  
166
  return table;
Niels Möller's avatar
Niels Möller committed
167
168
169
};

/* Returns -1 if allocation fails */
170
int alloc_channel(struct channel_table *table)
Niels Möller's avatar
Niels Möller committed
171
{
172
173
  /* FIXME: Use int  here? */
  UINT32 i;
174
  for(i = table->next_channel; i < table->used_channels; i++)
Niels Möller's avatar
Niels Möller committed
175
    {
176
      if (!table->channels[i])
Niels Möller's avatar
Niels Möller committed
177
	{
178
	  table->next_channel = i+1;
Niels Möller's avatar
Niels Möller committed
179
180
181
	  return i;
	}
    }
182
  if (i == table->max_channels)
Niels Möller's avatar
Niels Möller committed
183
    return -1;
184
  if (i == table->allocated_channels) 
Niels Möller's avatar
Niels Möller committed
185
    {
186
      int new_size = table->allocated_channels * 2;
Niels Möller's avatar
Niels Möller committed
187
      struct ssh_channel **new
188
	= lsh_space_alloc(sizeof(struct ssh_channel *) * new_size);
Niels Möller's avatar
Niels Möller committed
189

190
191
      memcpy(new, table->channels,
	     sizeof(struct ssh_channel *) * table->used_channels);
Niels Möller's avatar
Niels Möller committed
192
      
193
194
      table->channels = new;
      table->allocated_channels = new_size;
Niels Möller's avatar
Niels Möller committed
195
196
    }

197
  table->next_channel = table->used_channels = i+1;
Niels Möller's avatar
Niels Möller committed
198
199
200
201

  return i;
}

202
void dealloc_channel(struct channel_table *table, int i)
Niels Möller's avatar
Niels Möller committed
203
204
{
  assert(i >= 0);
205
  assert(i < table->used_channels);
Niels Möller's avatar
Niels Möller committed
206
  
207
208
209
210
211
212
213
214
215
216
217
218
  table->channels[i] = NULL;

  if (i < table->next_channel)
    table->next_channel = i;
}

int register_channel(struct channel_table *table, struct ssh_channel *channel)
{
  int n = alloc_channel(table);

  if (n >= 0)
    table->channels[n] = channel;
Niels Möller's avatar
Niels Möller committed
219

220
  return n;
Niels Möller's avatar
Niels Möller committed
221
222
}

223
struct ssh_channel *lookup_channel(struct channel_table *table, UINT32 i)
Niels Möller's avatar
Niels Möller committed
224
{
225
226
  return (i < table->used_channels)
    ? table->channels[i] : NULL;
Niels Möller's avatar
Niels Möller committed
227
228
}

229
230
231
232
233
234
235
236
237
238
239
240
241
static int adjust_rec_window(struct ssh_channel *channel)
{
  if (channel->rec_window_size < channel->max_window / 2)
    {
      int increment = channel->max_window - channel->rec_window_size;
      channel->rec_window_size = channel->max_window;
      
      return A_WRITE(channel->write,
		     prepare_window_adjust(channel, increment));
    }
  return 0;
}

Niels Möller's avatar
Niels Möller committed
242
243
244
245
static int channel_process_status(struct channel_table *table,
				  int channel,
				  int status)
{
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
  struct ssh_channel *c = table->channels[channel];
  
  while (!LSH_CLOSEDP(status))
    {
      if (status & LSH_CHANNEL_READY_SEND)
	{
	  status &= ~ LSH_CHANNEL_READY_SEND;
	  if (c->send_window_size)
	    status |= CHANNEL_SEND(c);
	}
      else if (status & LSH_CHANNEL_READY_REC)
	{
	  status &= ~ LSH_CHANNEL_READY_REC;
	  status |= adjust_rec_window(c);
	}
      else
	break;
    }
	
Niels Möller's avatar
Niels Möller committed
265
266
267
268
269
270
271
  if (status & LSH_CHANNEL_PENDING_CLOSE)
    table->pending_close = 1;
  
  if (status & LSH_CHANNEL_FINISHED)
    {
      /* Clear this bit */
      status &= ~LSH_CHANNEL_FINISHED;
272

273
274
      if (c->close)
	CHANNEL_CLOSE(c);
Niels Möller's avatar
Niels Möller committed
275
276
277
278
279
280
281
282
283
284
      
      dealloc_channel(table, channel);

      /* If this was the last channel, close connection */
      if (table->pending_close && !table->next_channel)
	status |= LSH_CLOSE;
    }

  return status;
}
Niels Möller's avatar
Niels Möller committed
285

Niels Möller's avatar
Niels Möller committed
286
/* Channel related messages */
Niels Möller's avatar
Niels Möller committed
287
288
289
290
static int do_global_request(struct packet_handler *c,
			     struct ssh_connection *connection,
			     struct lsh_string *packet)
{
291
  CAST(global_request_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323

  struct simple_buffer buffer;
  int msg_number;
  int name;
  int want_reply;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_GLOBAL_REQUEST)
      && parse_atom(&buffer, &name)
      && parse_boolean(&buffer, &want_reply))
    {
      struct global_request *req;

      lsh_string_free(packet);
      
      if (!name || !(req = ALIST_GET(closure->global_requests, name)))
	return A_WRITE(connection->write,
		       format_global_failure());

      return GLOBAL_REQUEST(req, want_reply, &buffer);
    }
  lsh_string_free(packet);

  return LSH_FAIL | LSH_DIE;
}

static int do_channel_open(struct packet_handler *c,
			   struct ssh_connection *connection,
			   struct lsh_string *packet)
{
324
  CAST(channel_open_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
325
326
327
328

  struct simple_buffer buffer;
  int msg_number;
  int type;
329
330
331
  UINT32 remote_channel_number;
  UINT32 window_size;
  UINT32 max_packet;
Niels Möller's avatar
Niels Möller committed
332
333
334
335
336
337
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_OPEN)
      && parse_atom(&buffer, &type)
338
339
340
      && parse_uint32(&buffer, &remote_channel_number)
      && parse_uint32(&buffer, &window_size)
      && parse_uint32(&buffer, &max_packet))
Niels Möller's avatar
Niels Möller committed
341
342
    {
      struct channel_open *open;
343
344
345
346
347
348
349
      struct ssh_channel *channel;
      UINT32 error = 0;
      char *error_msg;
      struct lsh_string *args = NULL;
      
      int local_channel_number;
      
Niels Möller's avatar
Niels Möller committed
350
      lsh_string_free(packet);
Niels Möller's avatar
Niels Möller committed
351
352
353
354
355
356
357

      if (closure->super.table->pending_close)
	/* We are waiting for channels to close. Don't open any new ones. */
	return A_WRITE(connection->write,
		       format_open_failure(remote_channel_number,
					   SSH_OPEN_ADMINISTRATIVELY_PROHIBITED,
					   "Waiting for channels to close.", ""));
Niels Möller's avatar
Niels Möller committed
358
359
360
      
      if (!type || !(open = ALIST_GET(closure->channel_types, type)))
	return A_WRITE(connection->write,
361
		       format_open_failure(remote_channel_number,
Niels Möller's avatar
Niels Möller committed
362
363
					   SSH_OPEN_UNKNOWN_CHANNEL_TYPE,
					   "Unknown channel type", ""));
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
      
      channel = CHANNEL_OPEN(open, &buffer, &error, &error_msg, &args);
      
      if (!channel)
	{
	  if (error)
	    return A_WRITE(connection->write,
			   format_open_failure(remote_channel_number,
					       error, error_msg, ""));
	  /* The request was invalid */
	  return LSH_FAIL | LSH_DIE;
	}

      if ( (local_channel_number
	    = register_channel(closure->super.table, channel)) < 0)
	{
	  werror("Could not allocate a channel number for pened channel!\n");
	  return A_WRITE(connection->write,
			 format_open_failure(remote_channel_number,
					     SSH_OPEN_RESOURCE_SHORTAGE,
					     "Could not allocate a channel number "
					     "(shouldn't happen...)", ""));
	}
      
      channel->send_window_size = window_size;
      channel->send_max_packet = max_packet;
      channel->channel_number = remote_channel_number;

      channel->write = connection->write;

      return A_WRITE(connection->write,
		     args
		     ? format_open_confirmation(channel, local_channel_number,
						"%lfS", args)
Niels Möller's avatar
Niels Möller committed
398
399
		     : format_open_confirmation(channel, local_channel_number,
						""));
Niels Möller's avatar
Niels Möller committed
400
401
402
403
404
405
406
407
408
409
    }
  lsh_string_free(packet);

  return LSH_FAIL | LSH_DIE;
}     

static int do_channel_request(struct packet_handler *c,
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
410
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  int type;
  int want_reply;

  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_REQUEST)
      && parse_uint32(&buffer, &channel_number)
      && parse_atom(&buffer, &type)
      && parse_boolean(&buffer, &want_reply))
    {
426
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
427
428
429
430
431
432
433
434
						   channel_number);

      lsh_string_free(packet);
      
      if (channel)
	{
	  struct channel_request *req;

435
436
	  if (type && channel->request_types 
	      && ( (req = ALIST_GET(channel->request_types, type)) ))
Niels Möller's avatar
Niels Möller committed
437
438
439
	    return channel_process_status
	      (closure->table, channel_number,
	       CHANNEL_REQUEST(req, channel, want_reply, &buffer));
440
	  else
441
442
443
444
445
	    return want_reply
	      ? A_WRITE(connection->write,
			format_channel_failure(channel->channel_number))
	      : LSH_OK | LSH_GOON;
	  
Niels Möller's avatar
Niels Möller committed
446
447
448
449
450
451
452
453
454
455
456
457
	}
      werror("SSH_MSG_CHANNEL_REQUEST on nonexistant channel %d\n",
	     channel_number);
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);

  return LSH_FAIL | LSH_DIE;
}
      
static int do_window_adjust(struct packet_handler *c,
			    struct ssh_connection *connection,
458
			    struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
459
{
460
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
461
462
463
464
465
466
467
468
469
470

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  UINT32 size;

  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_WINDOW_ADJUST)
471
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
472
473
474
      && parse_uint32(&buffer, &size)
      && parse_eod(&buffer))
    {
475
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
476
477
478
479
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
480
481
      if (channel
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
482
	{
Niels Möller's avatar
Niels Möller committed
483
484
485
486
	  if (! (channel->flags & CHANNEL_SENT_CLOSE))
	    {
	      channel->send_window_size += size;
	      if (channel->send_window_size && channel->send)
Niels Möller's avatar
Niels Möller committed
487
488
489
		return channel_process_status(closure->table,
					      channel_number,
					      CHANNEL_SEND(channel));
Niels Möller's avatar
Niels Möller committed
490
	    }
Niels Möller's avatar
Niels Möller committed
491
492
493
494
	  return LSH_OK | LSH_GOON;
	}
      /* FIXME: What to do now? Should unknown channel numbers be
       * ignored silently? */
Niels Möller's avatar
Niels Möller committed
495
      werror("SSH_MSG_CHANNEL_WINDOW_ADJUST on nonexistant or closed channel %d\n",
Niels Möller's avatar
Niels Möller committed
496
497
498
499
500
501
502
503
504
505
506
507
	     channel_number);
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);

  return LSH_FAIL | LSH_DIE;
}

static int do_channel_data(struct packet_handler *c,
			   struct ssh_connection *connection,
			   struct lsh_string *packet)
{
508
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
509
510
511
512
513
514
515
516
517
518

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  struct lsh_string *data;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_DATA)
519
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
520
521
522
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
523
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
524
525
526
527
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
528
529
      if (channel && channel->recieve
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
530
	{
Niels Möller's avatar
Niels Möller committed
531
	  if (channel->flags & CHANNEL_SENT_CLOSE)
Niels Möller's avatar
Niels Möller committed
532
	    {
Niels Möller's avatar
Niels Möller committed
533
534
	      werror("Ignoring data on channel which is closing\n");
	      return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
535
	    }
Niels Möller's avatar
Niels Möller committed
536
537
	  else
	    {
538
539
	      int res = 0;
	      
Niels Möller's avatar
Niels Möller committed
540
541
542
543
544
545
	      if (data->length > channel->rec_window_size)
		{
		  /* Truncate data to fit window */
		  werror("Channel data overflow. Extra data ignored.\n"); 
		  data->length = channel->rec_window_size;
		}
546
547
548
549

	      if (!data->length)
		/* Ignore data packet */
		return 0;
550
551
	      channel->rec_window_size -= data->length;

552
553
554
555
556
557
	      /* FIXME: Unconditionally adjusting the recieve window
	       * breaks flow control. We better let the channel's
	       * recieve method decide whether or not to recieve more
	       * data. */
	      res = adjust_rec_window(channel);
	      
558
559
560
561
562
563
564
565
566
	      if (channel->rec_window_size < channel->max_window / 2)
		{
		  res = A_WRITE(channel->write, prepare_window_adjust
				(channel,
				 channel->max_window - channel->rec_window_size));
		  if (LSH_CLOSEDP(res))
		    return res;
		}

Niels Möller's avatar
Niels Möller committed
567
568
569
570
	      return channel_process_status(
		closure->table, channel_number,
		res | CHANNEL_RECIEVE(channel, 
				      CHANNEL_DATA, data));
Niels Möller's avatar
Niels Möller committed
571
572
	    }
	  return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
	}
	  
      werror("Data on closed or non-existant channel %d\n",
	     channel_number);
      lsh_string_free(data);
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);
  
  return LSH_FAIL | LSH_DIE;
}

static int do_channel_extended_data(struct packet_handler *c,
				    struct ssh_connection *connection,
				    struct lsh_string *packet)
{
589
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
590
591
592
593
594
595
596
597
598
599
600

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  UINT32 type;
  struct lsh_string *data;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_EXTENDED_DATA)
601
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
602
603
604
605
      && parse_uint32(&buffer, &type)
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
606
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
607
608
609
610
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
611
612
      if (channel && channel->recieve
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
613
	{
Niels Möller's avatar
Niels Möller committed
614
	  if (channel->flags & CHANNEL_SENT_CLOSE)
Niels Möller's avatar
Niels Möller committed
615
	    {
Niels Möller's avatar
Niels Möller committed
616
617
	      werror("Ignoring extended data on channel which is closing\n");
	      return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
618
	    }
Niels Möller's avatar
Niels Möller committed
619
	  else
Niels Möller's avatar
Niels Möller committed
620
	    {
621
622
	      int res = 0;
	      
Niels Möller's avatar
Niels Möller committed
623
624
625
626
627
628
629
630
631
	      if (data->length > channel->rec_window_size)
		{
		  /* Truncate data to fit window */
		  werror("Channel extended data overflow. "
			 "Extra data ignored.\n");
		  data->length = channel->rec_window_size;
		}
	      
	      channel->rec_window_size -= data->length;
632
633
634
635
636
637
638
639
640
641

	      if (channel->rec_window_size < channel->max_window / 2)
		{
		  res = A_WRITE(channel->write, prepare_window_adjust
				(channel,
				 channel->max_window - channel->rec_window_size));
		  if (LSH_CLOSEDP(res))
		    return res;
		}

Niels Möller's avatar
Niels Möller committed
642
643
644
	      switch(type)
		{
		case SSH_EXTENDED_DATA_STDERR:
Niels Möller's avatar
Niels Möller committed
645
646
647
648
		  return channel_process_status(
		    closure->table, channel_number,
		    res | CHANNEL_RECIEVE(channel, 
					  CHANNEL_STDERR_DATA, data));
Niels Möller's avatar
Niels Möller committed
649
650
651
652
653
654
		default:
		  werror("Unknown type %d of extended data.\n",
			 type);
		  lsh_string_free(data);
		  return LSH_FAIL | LSH_DIE;
		}
Niels Möller's avatar
Niels Möller committed
655
656
657
658
659
660
661
662
663
664
665
666
667
	    }
	}
      werror("Extended data on closed or non-existant channel %d\n",
	     channel_number);
      lsh_string_free(data);
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);
  
  return LSH_FAIL | LSH_DIE;
}

static int do_channel_eof(struct packet_handler *c,
668
669
			  struct ssh_connection *connection,
			  struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
670
{
671
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
672
673
674
675
676
677
678
679
680

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_EOF)
681
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
682
683
      && parse_eod(&buffer))
    {
684
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
685
686
687
688
						   channel_number);

      lsh_string_free(packet);

Niels Möller's avatar
Niels Möller committed
689
690
      if (channel)
	{
691
692
	  int res = 0;
	  
Niels Möller's avatar
Niels Möller committed
693
694
695
696
697
698
699
700
	  if (channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE))
	    {
	      werror("Recieving EOF on channel on closed channel.\n");
	      return LSH_FAIL | LSH_DIE;
	    }

	  channel->flags |= CHANNEL_RECIEVED_EOF;

701
702
	  if (channel->eof)
	    res = CHANNEL_EOF(channel);
703
704
705
	  else
	    /* FIXME: What is a reasonable default behaviour?
	     * Closing the channel may be the right thing to do. */
706
707
708
	  if (!LSH_CLOSEDP(res)
	      && ! (channel->flags & CHANNEL_SENT_CLOSE)
	      && (channel->flags & CHANNEL_SENT_EOF))
Niels Möller's avatar
Niels Möller committed
709
710
711
	    {
	      /* Both parties have sent EOF. Initiate close, if we
	       * havn't done that already. */
712
713
	      
	      res |= channel_close(channel);
Niels Möller's avatar
Niels Möller committed
714
	    }
715
716
717
718
	      
	  return channel_process_status(closure->table, channel_number,
					res);

Niels Möller's avatar
Niels Möller committed
719
720
721
722
	}
      werror("EOF on non-existant channel %d\n",
	     channel_number);
      return LSH_FAIL | LSH_DIE;
Niels Möller's avatar
Niels Möller committed
723
    }
Niels Möller's avatar
Niels Möller committed
724
      
Niels Möller's avatar
Niels Möller committed
725
726
727
728
729
730
731
732
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

static int do_channel_close(struct packet_handler *c,
			    struct ssh_connection *connection,
			    struct lsh_string *packet)
{
733
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
734
735
736
737
738
739
740
741
742

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_CLOSE)
743
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
744
745
      && parse_eod(&buffer))
    {
746
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
747
748
749
750
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
751
752
      if (channel)
	{
753
754
	  int res = 0;
	  
Niels Möller's avatar
Niels Möller committed
755
756
757
758
759
760
761
762
	  if (channel->flags & CHANNEL_RECIEVED_CLOSE)
	    {
	      werror("Recieving multiple CLOSE on channel.\n");
	      return LSH_FAIL | LSH_DIE;
	    }

	  channel->flags |= CHANNEL_RECIEVED_CLOSE;
	  
Niels Möller's avatar
Niels Möller committed
763
	  if (! (channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_SENT_EOF)))
Niels Möller's avatar
Niels Möller committed
764
765
766
	    {
	      werror("Unexpected channel CLOSE.\n");
	    }
767
768
769

	  if (! (channel->flags & (CHANNEL_RECIEVED_EOF))
	      && channel->eof)
770
	    res = CHANNEL_EOF(channel);
Niels Möller's avatar
Niels Möller committed
771
	  
Niels Möller's avatar
Niels Möller committed
772
773
	  return channel_process_status(
	    closure->table, channel_number,
774
775
776
777
	    ( ( (channel->flags & (CHANNEL_SENT_CLOSE))
		? LSH_OK | LSH_CHANNEL_FINISHED
		: channel_close(channel))
	      | res));
Niels Möller's avatar
Niels Möller committed
778
779
780
781
	}
      werror("CLOSE on non-existant channel %d\n",
	     channel_number);
      return LSH_FAIL | LSH_DIE;
Niels Möller's avatar
Niels Möller committed
782
783
784
785
786
787
      
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

788
static int do_channel_open_confirm(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
789
790
791
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
792
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810

  struct simple_buffer buffer;
  int msg_number;
  UINT32 local_channel_number;
  UINT32 remote_channel_number;  
  UINT32 window_size;
  UINT32 max_packet;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_OPEN_CONFIRMATION)
      && parse_uint32(&buffer, &local_channel_number)
      && parse_uint32(&buffer, &remote_channel_number)
      && parse_uint32(&buffer, &window_size)
      && parse_uint32(&buffer, &max_packet)
      && parse_eod(&buffer))
    {
811
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
812
813
814
815
						   local_channel_number);

      lsh_string_free(packet);

816
      if (channel && channel->open_confirm)
Niels Möller's avatar
Niels Möller committed
817
818
819
820
821
	{
	  channel->channel_number = remote_channel_number;
	  channel->send_window_size = window_size;
	  channel->send_max_packet = max_packet;

Niels Möller's avatar
Niels Möller committed
822
823
	  return channel_process_status(closure->table, local_channel_number,
					CHANNEL_OPEN_CONFIRM(channel));
Niels Möller's avatar
Niels Möller committed
824
825
826
827
828
829
830
831
832
	}
      werror("Unexpected SSH_MSG_CHANNEL_OPEN_CONFIRMATION on channel %d\n",
	     local_channel_number);
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

833
static int do_channel_open_failure(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
834
835
836
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
837
  CAST(channel_handler, closure, c);
Niels Möller's avatar
Niels Möller committed
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  UINT32 reason;

  UINT8 *msg;
  UINT32 length;

  UINT8 *language;
  UINT32 language_length;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_OPEN_FAILURE)
      && parse_uint32(&buffer, &channel_number)
      && parse_uint32(&buffer, &reason)
      && parse_string(&buffer, &length, &msg)
      && parse_string(&buffer, &language_length, &language)
      && parse_eod(&buffer))
    {
860
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
861
862
863
864
						   channel_number);

      /* lsh_string_free(packet); */

865
      if (channel && channel->open_failure)
Niels Möller's avatar
Niels Möller committed
866
	{
867
	  int res = CHANNEL_OPEN_FAILURE(channel);
Niels Möller's avatar
Niels Möller committed
868
869

	  lsh_string_free(packet);
Niels Möller's avatar
Niels Möller committed
870
871
872

	  return channel_process_status(closure->table, channel_number,
					res | LSH_CHANNEL_FINISHED);
Niels Möller's avatar
Niels Möller committed
873
874
875
876
877
878
879
880
881
882
883
	}
      werror("Unexpected SSH_MSG_CHANNEL_OPEN_FAILURE on channel %d\n",
	     channel_number);
      lsh_string_free(packet);
      
      return LSH_FAIL | LSH_DIE;
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

884
885
886
887
static int do_channel_success(struct packet_handler *c,
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
888
  CAST(channel_handler, closure, c);
889
890
891
892
893
894
895
896
897

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_SUCCESS)
898
      && parse_uint32(&buffer, &channel_number)
899
900
901
902
903
904
905
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
906
      if (channel && channel->channel_success)
Niels Möller's avatar
Niels Möller committed
907
908
	return channel_process_status(closure->table, channel_number,
				      CHANNEL_SUCCESS(channel));
909
910
911
912
913
914
915
916
917
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

static int do_channel_failure(struct packet_handler *c,
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
918
  CAST(channel_handler, closure, c);
919
920
921
922
923
924
925
926
927

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_FAILURE)
928
      && parse_uint32(&buffer, &channel_number)
929
930
931
932
933
934
935
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
936
      if (channel && channel->channel_failure)
Niels Möller's avatar
Niels Möller committed
937
938
	return channel_process_status(closure->table, channel_number,
				      CHANNEL_FAILURE(channel));
939
940
941
942
943
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

944
static int init_connection_service(struct ssh_service *s,
Niels Möller's avatar
Niels Möller committed
945
				   struct ssh_connection *connection)
Niels Möller's avatar
Niels Möller committed
946
{
947
948
  CAST(connection_service, self, s);

949
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
950
  
951
952
953
  NEW(global_request_handler, globals);
  NEW(channel_open_handler, open);
  NEW(channel_handler, request);
Niels Möller's avatar
Niels Möller committed
954

955
956
957
  NEW(channel_handler, adjust);
  NEW(channel_handler, data);
  NEW(channel_handler, extended);
Niels Möller's avatar
Niels Möller committed
958

959
960
  NEW(channel_handler, eof);
  NEW(channel_handler, close);
961

962
963
  NEW(channel_handler, open_confirm);
  NEW(channel_handler, open_failure);
Niels Möller's avatar
Niels Möller committed
964

965
966
  NEW(channel_handler, channel_success);
  NEW(channel_handler, channel_failure);
Niels Möller's avatar
Niels Möller committed
967

968
  table = make_channel_table();
Niels Möller's avatar
Niels Möller committed
969
970
  
  globals->super.super.handler = do_global_request;
971
  globals->super.table = table;
Niels Möller's avatar
Niels Möller committed
972
973
974
975
  globals->global_requests = self->global_requests;
  connection->dispatch[SSH_MSG_GLOBAL_REQUEST] = &globals->super.super;
    
  open->super.super.handler = do_channel_open;
976
  open->super.table = table;
Niels Möller's avatar
Niels Möller committed
977
978
979
980
  open->channel_types = self->channel_types;
  connection->dispatch[SSH_MSG_CHANNEL_OPEN] = &open->super.super;

  request->super.handler = do_channel_request;
981
  request->table = table;
Niels Möller's avatar
Niels Möller committed
982
983
984
  connection->dispatch[SSH_MSG_CHANNEL_REQUEST] = &request->super;
  
  adjust->super.handler = do_window_adjust;
985
  adjust->table = table;
Niels Möller's avatar
Niels Möller committed
986
987
988
  connection->dispatch[SSH_MSG_CHANNEL_WINDOW_ADJUST] = &adjust->super;

  data->super.handler = do_channel_data;
989
  data->table = table;
Niels Möller's avatar
Niels Möller committed
990
991
992
  connection->dispatch[SSH_MSG_CHANNEL_DATA] = &data->super;

  extended->super.handler = do_channel_extended_data;
993
  extended->table = table;
994
  connection->dispatch[SSH_MSG_CHANNEL_EXTENDED_DATA] = &extended->super;
Niels Möller's avatar
Niels Möller committed
995
996

  eof->super.handler = do_channel_eof;
997
  eof->table = table;
Niels Möller's avatar
Niels Möller committed
998
999
1000
  connection->dispatch[SSH_MSG_CHANNEL_EOF] = &eof->super;

  close->super.handler = do_channel_close;
1001
  close->table = table;
Niels Möller's avatar
Niels Möller committed
1002
1003
  connection->dispatch[SSH_MSG_CHANNEL_CLOSE] = &close->super;

1004
1005
1006
  open_confirm->super.handler = do_channel_open_confirm;
  open_confirm->table = table;
  connection->dispatch[SSH_MSG_CHANNEL_OPEN_CONFIRMATION] = &open_confirm->super;
Niels Möller's avatar
Niels Möller committed
1007

1008
1009
1010
  open_failure->super.handler = do_channel_open_failure;
  open_failure->table = table;
  connection->dispatch[SSH_MSG_CHANNEL_OPEN_FAILURE] = &open_failure->super;
Niels Möller's avatar
Niels Möller committed
1011
  
1012
1013
1014
1015
1016
1017
1018
1019
  channel_success->super.handler = do_channel_success;
  channel_success->table = table;
  connection->dispatch[SSH_MSG_CHANNEL_SUCCESS] = &channel_success->super;

  channel_failure->super.handler = do_channel_failure;
  channel_failure->table = table;
  connection->dispatch[SSH_MSG_CHANNEL_FAILURE] = &channel_failure->super;
    
Niels Möller's avatar
Niels Möller committed
1020
1021
  return self->start
    ? CONNECTION_START(self->start, table, connection->write)
1022
    : LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
1023
1024
}

1025
1026
1027
struct ssh_service *make_connection_service(struct alist *global_requests,
					    struct alist *channel_types,
					    struct connection_startup *start)
1028
{
1029
  NEW(connection_service, self);
1030

1031
1032
1033
1034
1035
1036
  self->super.init = init_connection_service;
  self->global_requests = global_requests;
  self->channel_types = channel_types;
  self->start = start;
  
  return &self->super;
1037
1038
}

Niels Möller's avatar
Niels Möller committed
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
struct lsh_string *format_channel_close(struct ssh_channel *channel)
{
  return ssh_format("%c%i",
		    SSH_MSG_CHANNEL_CLOSE,
		    channel->channel_number);
}

int channel_close(struct ssh_channel *channel)
{
  channel->flags |= CHANNEL_SENT_CLOSE;

  return A_WRITE(channel->write, format_channel_close(channel))
    | ( (channel->flags & CHANNEL_RECIEVED_CLOSE)
	? LSH_CHANNEL_FINISHED : 0);
}

struct lsh_string *format_channel_eof(struct ssh_channel *channel)
{
  return ssh_format("%c%i",
		    SSH_MSG_CHANNEL_EOF,
		    channel->channel_number);
}

int channel_eof(struct ssh_channel *channel)
{
  int res ;
  
1066
  channel->flags |= CHANNEL_SENT_EOF;
Niels Möller's avatar
Niels Möller committed
1067
  res = A_WRITE(channel->write, format_channel_eof(channel));
Niels Möller's avatar
Niels Möller committed
1068
1069
1070
1071

  if (LSH_CLOSEDP(res))
    return res;

1072
  if (channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_CLOSE_AT_EOF))
Niels Möller's avatar
Niels Möller committed
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
    {
      /* Initiate close */
      res |= channel_close(channel);
    }

  return res;
}

void init_channel(struct ssh_channel *channel)
{
  /* channel->super.handler = do_read_channel; */
  channel->write = NULL;

  channel->flags = 0;
1087
  channel->sources = 0;
Niels Möller's avatar
Niels Möller committed
1088
1089
1090
1091
  
  channel->request_types = NULL;
  channel->recieve = NULL;
  channel->send = NULL;
1092

Niels Möller's avatar
Niels Möller committed
1093
1094
  channel->close = NULL;
  channel->eof = NULL;
1095

Niels Möller's avatar
Niels Möller committed
1096
1097
1098
1099
1100
1101
  channel->open_confirm = NULL;
  channel->open_failure = NULL;
  channel->channel_success = NULL;
  channel->channel_failure = NULL;
}

1102
1103
struct lsh_string *channel_transmit_data(struct ssh_channel *channel,
					 struct lsh_string *data)
1104
{
1105
1106
1107
1108
1109
1110
1111
  assert(data->length <= channel->send_window_size);
  assert(data->length <= channel->send_max_packet);
  
  return ssh_format("%c%i%fS",
		    SSH_MSG_CHANNEL_DATA,
		    channel->channel_number,
		    data);
1112
1113
}

1114
1115
1116
struct lsh_string *channel_transmit_extended(struct ssh_channel *channel,
					     UINT32 type,
					     struct lsh_string *data)
1117
{
1118
1119
  assert(data->length <= channel->send_window_size);
  assert(data->length <= channel->send_max_packet);
1120
  
1121
1122
1123
  return ssh_format("%c%i%i%fS",
		    SSH_MSG_CHANNEL_EXTENDED_DATA,
		    channel->channel_number,
1124
		    type,
1125
		    data);
1126
1127
}

Niels Möller's avatar
Niels Möller committed
1128
/* Writing data to a channel */
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
/* CLASS:
   (class
     (name channel_write)
     (super abstract_write)
     (vars
       (channel object ssh_channel)))
*/

/* CLASS:
   (class
     (name channel_write_extended)
     (super channel_write)
     (vars
       (type simple UINT32)))
*/
Niels Möller's avatar
Niels Möller committed
1144

1145
static int do_channel_write(struct abstract_write *w,
Niels Möller's avatar
Niels Möller committed
1146
1147
			    struct lsh_string *packet)
{
1148
  struct channel_write *closure = (struct channel_write *) w;
Niels Möller's avatar
Niels Möller committed
1149

Niels Möller's avatar
Niels Möller committed
1150
1151
1152
1153
  return A_WRITE(closure->channel->write,
		 channel_transmit_data(closure->channel, packet));
}

1154
1155
static int do_channel_write_extended(struct abstract_write *w,
				     struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
1156
{
1157
  CAST(channel_write_extended, closure, w);
Niels Möller's avatar
Niels Möller committed
1158
1159
1160
1161
1162

  return A_WRITE(closure->super.channel->write,
		 channel_transmit_extended(closure->super.channel,
					   closure->type,
					   packet));
1163
1164
}

Niels Möller's avatar
Niels Möller committed
1165
struct abstract_write *make_channel_write(struct ssh_channel *channel)
1166
{
1167
  NEW(channel_write, closure);
Niels Möller's avatar
Niels Möller committed
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177

  closure->super.write = do_channel_write;
  closure->channel = channel;

  return &closure->super;
}

struct abstract_write *make_channel_write_extended(struct ssh_channel *channel,
						   UINT32 type)
{
1178
  NEW(channel_write_extended, closure);
Niels Möller's avatar
Niels Möller committed
1179
1180
1181
1182

  closure->super.super.write = do_channel_write_extended;
  closure->super.channel = channel;
  closure->type = type;
1183
  
Niels Möller's avatar
Niels Möller committed
1184
  return &closure->super.super;
Niels Möller's avatar
Niels Möller committed
1185
}
1186

Niels Möller's avatar
Niels Möller committed
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
struct read_handler *make_channel_read_data(struct ssh_channel *channel)
{
  return make_read_data(channel, make_channel_write(channel));
}

struct read_handler *make_channel_read_stderr(struct ssh_channel *channel)
{
  return make_read_data(channel,
			make_channel_write_extended(channel,
						    SSH_EXTENDED_DATA_STDERR));
}    

1199
1200
1201
1202
1203
1204
1205
1206
/* CLASS:
   (class
     (name channel_close_callback)
     (super close_callback)
     (vars
       (channel object ssh_channel)))
*/

1207
1208
static int channel_close_callback(struct close_callback *c, int reason)
{
1209
  CAST(channel_close_callback, closure, c);
1210
1211
1212
1213
1214
1215
1216
1217
1218

  channel_close(closure->channel);

  /* FIXME: So far, the returned value is ignored. */
  return 17;
}
  
struct close_callback *make_channel_close(struct ssh_channel *channel)
{
1219
1220
  NEW(channel_close_callback, closure);
  
1221
1222
1223
1224
1225
1226
  closure->super.f = channel_close_callback;
  closure->channel = channel;

  return &closure->super;
}

1227
1228
struct lsh_string *prepare_channel_open(struct channel_table *table,
					int type, struct ssh_channel *channel,
1229
					const char *format, ...)
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
{
  int index;
    
  va_list args;
  UINT32 l1, l2;
  struct lsh_string *packet;

#define OPEN_FORMAT "%c%a%i%i%i"
#define OPEN_ARGS SSH_MSG_CHANNEL_OPEN, type, (UINT32) index, \
  channel->rec_window_size, channel->rec_max_packet  

  index = register_channel(table, channel);
  if (index < 0)
    return NULL;

  l1 = ssh_format_length(OPEN_FORMAT, OPEN_ARGS);
  
  va_start(args, format);
  l2 = ssh_vformat_length(format, args);
  va_end(args);

  packet = lsh_string_alloc(l1 + l2);

  ssh_format_write(OPEN_FORMAT, l1, packet->data, OPEN_ARGS);

  va_start(args, format);
1256
  ssh_vformat_write(format, l2, packet->data+l1, args);
1257
1258
1259
1260
1261
1262
1263
1264
  va_end(args);

  return packet;
#undef OPEN_FORMAT
#undef OPEN_ARGS
}
		   
struct lsh_string *format_channel_request(int type, struct ssh_channel *channel,
1265
1266
					  int want_reply, const char *format, 
					  ...)
1267
1268
1269
1270
1271
1272
{
  va_list args;
  UINT32 l1, l2;
  struct lsh_string *packet;

#define REQUEST_FORMAT "%c%i%a%c"
Niels Möller's avatar
Niels Möller committed
1273
#define REQUEST_ARGS SSH_MSG_CHANNEL_REQUEST, channel->channel_number, \
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
  type, want_reply
    
  l1 = ssh_format_length(REQUEST_FORMAT, REQUEST_ARGS);
  
  va_start(args, format);
  l2 = ssh_vformat_length(format, args);
  va_end(args);

  packet = lsh_string_alloc(l1 + l2);

  ssh_format_write(REQUEST_FORMAT, l1, packet->data, REQUEST_ARGS);

  va_start(args, format);
1287
  ssh_vformat_write(format, l2, packet->data+l1, args);
1288
1289
1290
1291
1292
1293
1294
  va_end(args);

  return packet;
#undef REQUEST_FORMAT
#undef REQUEST_ARGS
}