channel.c 23.6 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
28
29
30
31
32
33
34
35
36
37
38
39
40
41
/* 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"
#include "service.h"
#include "ssh.h"
#include "werror.h"
#include "xalloc.h"

#include <assert.h>

struct connection_service
{
  struct ssh_service super;

  /* Supported global requests */
  struct alist *global_requests;
  struct alist *channel_types;
42
43
44
45

  /* Initialize connection (for instance, request channels to be opened
   * or services to be forwarded. */
  struct connection_startup *start;
Niels Möller's avatar
Niels Möller committed
46
47
};

48
struct channel_handler
Niels Möller's avatar
Niels Möller committed
49
50
51
{
  struct packet_handler super;
  
52
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
53
54
55
56
};

struct global_request_handler
{
57
  struct channel_handler super;
Niels Möller's avatar
Niels Möller committed
58
59
60
61
62
63
  
  struct alist *global_requests;
};

struct channel_open_handler
{
64
  struct channel_handler super;
Niels Möller's avatar
Niels Möller committed
65
66
67
68
69
70
71

  struct alist *channel_types;
};

#if 0
struct channel_request_handler
{
72
  struct channel_handler *super;
Niels Möller's avatar
Niels Möller committed
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94

  struct alist *request_types;
};
#endif

struct lsh_string *format_global_failure(void)
{
  return ssh_format("%c", SSH_MSG_REQUEST_FAILURE);
}

struct lsh_string *format_open_failure(UINT32 channel, UINT32 reason,
				       char *msg, char *language)
{
  return ssh_format("%c%i%i%z%z", SSH_MSG_CHANNEL_OPEN_FAILURE,
		    channel, reason, msg, language);
}

struct lsh_string *format_channel_failure(UINT32 channel)
{
  return ssh_format("%c%i", SSH_MSG_CHANNEL_FAILURE, channel);
}

95
96
97
98
99
100
101
102
103
104
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);
}

105
/* Channel objects */
Niels Möller's avatar
Niels Möller committed
106
107
108
109
110

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

Niels Möller's avatar
Niels Möller committed
111
struct channel_table *make_channel_table(void)
Niels Möller's avatar
Niels Möller committed
112
{
113
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
114

115
116
  NEW(table);
  table->channels = lsh_space_alloc(sizeof(struct ssh_channel *)
117
				      * INITIAL_CHANNELS);
118
119
120
121
  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
122

123
  return table;
Niels Möller's avatar
Niels Möller committed
124
125
126
};

/* Returns -1 if allocation fails */
127
int alloc_channel(struct channel_table *table)
Niels Möller's avatar
Niels Möller committed
128
129
{
  int i;
130
  for(i = table->next_channel; i < table->used_channels; i++)
Niels Möller's avatar
Niels Möller committed
131
    {
132
      if (!table->channels[i])
Niels Möller's avatar
Niels Möller committed
133
	{
134
	  table->next_channel = i+1;
Niels Möller's avatar
Niels Möller committed
135
136
137
	  return i;
	}
    }
138
  if (i == table->max_channels)
Niels Möller's avatar
Niels Möller committed
139
    return -1;
140
  if (i == table->allocated_channels) 
Niels Möller's avatar
Niels Möller committed
141
    {
142
      int new_size = table->allocated_channels * 2;
Niels Möller's avatar
Niels Möller committed
143
      struct ssh_channel **new
144
	= lsh_space_alloc(sizeof(struct ssh_channel *) * new_size);
Niels Möller's avatar
Niels Möller committed
145

146
147
      memcpy(new, table->channels,
	     sizeof(struct ssh_channel *) * table->used_channels);
Niels Möller's avatar
Niels Möller committed
148
      
149
150
      table->channels = new;
      table->allocated_channels = new_size;
Niels Möller's avatar
Niels Möller committed
151
152
    }

153
  table->next_channel = table->used_channels = i+1;
Niels Möller's avatar
Niels Möller committed
154
155
156
157

  return i;
}

158
void dealloc_channel(struct channel_table *table, int i)
Niels Möller's avatar
Niels Möller committed
159
160
{
  assert(i >= 0);
161
  assert(i < table->used_channels);
Niels Möller's avatar
Niels Möller committed
162
  
163
164
165
166
167
168
169
170
171
172
173
174
  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
175

176
  return n;
Niels Möller's avatar
Niels Möller committed
177
178
}

179
struct ssh_channel *lookup_channel(struct channel_table *table, UINT32 i)
Niels Möller's avatar
Niels Möller committed
180
{
181
182
  return (i < table->used_channels)
    ? table->channels[i] : NULL;
Niels Möller's avatar
Niels Möller committed
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
}

/* Channel related messages */

static int do_global_request(struct packet_handler *c,
			     struct ssh_connection *connection,
			     struct lsh_string *packet)
{
  struct global_request_handler *closure = (struct global_request_handler *) c;

  struct simple_buffer buffer;
  int msg_number;
  int name;
  int want_reply;
  
  MDEBUG(closure);

  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)
{
  struct channel_open_handler *closure = (struct channel_open_handler *) c;

  struct simple_buffer buffer;
  int msg_number;
  int type;
  UINT32 channel_number;
  UINT32 rec_window_size;
  UINT32 rec_max_packet;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_OPEN)
      && parse_atom(&buffer, &type)
      && parse_uint32(&buffer, &rec_window_size)
      && parse_uint32(&buffer, &rec_max_packet))
    {
      struct channel_open *open;

      lsh_string_free(packet);
      
      if (!type || !(open = ALIST_GET(closure->channel_types, type)))
	return A_WRITE(connection->write,
		       format_open_failure(channel_number,
					   SSH_OPEN_UNKNOWN_CHANNEL_TYPE,
					   "Unknown channel type", ""));
      return CHANNEL_OPEN(open, channel_number, rec_window_size,
			  rec_max_packet, &buffer);
    }
  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)
{
266
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283

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

  MDEBUG(closure);

  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))
    {
284
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
285
286
287
288
289
290
291
292
						   channel_number);

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

293
294
295
296
	  if (type && channel->request_types 
	      && ( (req = ALIST_GET(channel->request_types, type)) ))
	    return CHANNEL_REQUEST(req, channel, want_reply, &buffer);
	  else
Niels Möller's avatar
Niels Möller committed
297
298
299
300
301
302
303
304
305
306
307
308
309
310
	    return A_WRITE(connection->write,
			   format_channel_failure(channel->channel_number));
	}
      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,
311
			    struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
312
{
313
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328

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

  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_WINDOW_ADJUST)
      && parse_uint32(&buffer, &size)
      && parse_eod(&buffer))
    {
329
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
330
331
332
333
334
335
336
						   channel_number);

      lsh_string_free(packet);
      
      if (channel)
	{
	  channel->send_window_size += size;
337
338
339
	  if (channel->send_window_size && channel->send)
	    CHANNEL_SEND(channel);
	  
Niels Möller's avatar
Niels Möller committed
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
	  return LSH_OK | LSH_GOON;
	}
      /* FIXME: What to do now? Should unknown channel numbers be
       * ignored silently? */
      werror("SSH_MSG_CHANNEL_WINDOW_ADJUST on nonexistant channel %d\n",
	     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)
{
357
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  struct lsh_string *data;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_DATA)
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
373
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
374
375
376
377
378
379
380
381
382
383
384
385
386
						   channel_number);

      lsh_string_free(packet);
      
      if (channel && channel->recieve)
	{
	  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;
	    }
	  channel->rec_window_size -= data->length; 
387
	  return CHANNEL_RECIEVE(channel, 
Niels Möller's avatar
Niels Möller committed
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
				 CHANNEL_DATA, data);
	}
	  
      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)
{
405
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  UINT32 type;
  struct lsh_string *data;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_EXTENDED_DATA)
      && parse_uint32(&buffer, &type)
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
423
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
						   channel_number);

      lsh_string_free(packet);
      
      if (channel && channel->recieve)
	{
	  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;
	  switch(type)
	    {
	    case SSH_EXTENDED_DATA_STDERR:
441
	      return CHANNEL_RECIEVE(channel, 
Niels Möller's avatar
Niels Möller committed
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
				     CHANNEL_DATA, data);
	    default:
	      werror("Unknown type %d of extended data.\n",
		     type);
	      lsh_string_free(data);
	      return LSH_FAIL | LSH_DIE;
	    }
	}
      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,
				    struct ssh_connection *connection,
				    struct lsh_string *packet)
{
464
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
465
466
467
468
469
470
471
472
473
474
475
476
477

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_EOF)
      && parse_eod(&buffer))
    {
478
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
479
480
481
482
483
						   channel_number);

      lsh_string_free(packet);

      if (channel && channel->eof)
484
	return CHANNEL_EOF(channel);
Niels Möller's avatar
Niels Möller committed
485
486
487
488
489
490
491
492
493
    }
  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)
{
494
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
495
496
497
498
499
500
501
502
503
504
505
506
507

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_CLOSE)
      && parse_eod(&buffer))
    {
508
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
509
510
511
512
513
						   channel_number);

      lsh_string_free(packet);
      
      if (channel && channel->close)
514
	return CHANNEL_CLOSE(channel);
Niels Möller's avatar
Niels Möller committed
515
516
517
518
519
520
      
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

521
static int do_channel_open_confirm(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
522
523
524
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
525
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545

  struct simple_buffer buffer;
  int msg_number;
  UINT32 local_channel_number;
  UINT32 remote_channel_number;  
  UINT32 window_size;
  UINT32 max_packet;
  
  MDEBUG(closure);

  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))
    {
546
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
547
548
549
550
						   local_channel_number);

      lsh_string_free(packet);

551
      if (channel && channel->open_confirm)
Niels Möller's avatar
Niels Möller committed
552
553
554
555
556
	{
	  channel->channel_number = remote_channel_number;
	  channel->send_window_size = window_size;
	  channel->send_max_packet = max_packet;

557
	  return CHANNEL_OPEN_CONFIRM(channel);
Niels Möller's avatar
Niels Möller committed
558
559
560
561
562
563
564
565
566
	}
      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;
}

567
static int do_channel_open_failure(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
568
569
570
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
571
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595

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

  UINT8 *msg;
  UINT32 length;

  UINT8 *language;
  UINT32 language_length;
  
  MDEBUG(closure);

  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))
    {
596
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
597
598
599
600
						   channel_number);

      /* lsh_string_free(packet); */

601
      if (channel && channel->open_failure)
Niels Möller's avatar
Niels Möller committed
602
	{
603
	  int res = CHANNEL_OPEN_FAILURE(channel);
Niels Möller's avatar
Niels Möller committed
604
605

	  lsh_string_free(packet);
606
	  dealloc_channel(closure->table, channel_number);
Niels Möller's avatar
Niels Möller committed
607
608
609
610
611
612
613
614
615
616
617
618
619
	  
	  return res;
	}
      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;
}

620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
static int do_channel_success(struct packet_handler *c,
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
  struct channel_handler *closure = (struct channel_handler *) c;

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_SUCCESS)
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
643
      if (channel && channel->channel_success)
644
	return CHANNEL_SUCCESS(channel);
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
      
    }
  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)
{
  struct channel_handler *closure = (struct channel_handler *) c;

  struct simple_buffer buffer;
  int msg_number;
  UINT32 channel_number;
  
  MDEBUG(closure);

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

  if (parse_uint8(&buffer, &msg_number)
      && (msg_number == SSH_MSG_CHANNEL_FAILURE)
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
674
      if (channel && channel->channel_failure)
675
	return CHANNEL_FAILURE(channel);
676
677
678
679
680
681
      
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

682
static int init_connection_service(struct ssh_service *s,
Niels Möller's avatar
Niels Möller committed
683
				   struct ssh_connection *connection)
Niels Möller's avatar
Niels Möller committed
684
685
{
  struct connection_service *self = (struct connection_service *) s;
686
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
687
688
689
  
  struct global_request_handler *globals;
  struct channel_open_handler *open;
690
  struct channel_handler *request;
Niels Möller's avatar
Niels Möller committed
691

692
693
694
  struct channel_handler *adjust;
  struct channel_handler *data;
  struct channel_handler *extended;
Niels Möller's avatar
Niels Möller committed
695

696
697
  struct channel_handler *eof;
  struct channel_handler *close;
Niels Möller's avatar
Niels Möller committed
698

699
700
701
702
703
  struct channel_handler *open_confirm;
  struct channel_handler *open_failure;

  struct channel_handler *channel_success;
  struct channel_handler *channel_failure;
Niels Möller's avatar
Niels Möller committed
704
705
706

  MDEBUG(self);

707
  table = make_channel_table();
Niels Möller's avatar
Niels Möller committed
708
709
710
  
  NEW(globals);
  globals->super.super.handler = do_global_request;
711
  globals->super.table = table;
Niels Möller's avatar
Niels Möller committed
712
713
714
715
716
  globals->global_requests = self->global_requests;
  connection->dispatch[SSH_MSG_GLOBAL_REQUEST] = &globals->super.super;
    
  NEW(open);
  open->super.super.handler = do_channel_open;
717
  open->super.table = table;
Niels Möller's avatar
Niels Möller committed
718
719
720
721
722
  open->channel_types = self->channel_types;
  connection->dispatch[SSH_MSG_CHANNEL_OPEN] = &open->super.super;

  NEW(request);
  request->super.handler = do_channel_request;
723
  request->table = table;
Niels Möller's avatar
Niels Möller committed
724
725
726
727
  connection->dispatch[SSH_MSG_CHANNEL_REQUEST] = &request->super;
  
  NEW(adjust);
  adjust->super.handler = do_window_adjust;
728
  adjust->table = table;
Niels Möller's avatar
Niels Möller committed
729
730
731
732
  connection->dispatch[SSH_MSG_CHANNEL_WINDOW_ADJUST] = &adjust->super;

  NEW(data);
  data->super.handler = do_channel_data;
733
  data->table = table;
Niels Möller's avatar
Niels Möller committed
734
735
736
737
  connection->dispatch[SSH_MSG_CHANNEL_DATA] = &data->super;

  NEW(extended);
  extended->super.handler = do_channel_extended_data;
738
  extended->table = table;
Niels Möller's avatar
Niels Möller committed
739
740
741
742
  connection->dispatch[SSH_MSG_CHANNEL_WINDOW_ADJUST] = &extended->super;

  NEW(eof);
  eof->super.handler = do_channel_eof;
743
  eof->table = table;
Niels Möller's avatar
Niels Möller committed
744
745
746
747
  connection->dispatch[SSH_MSG_CHANNEL_EOF] = &eof->super;

  NEW(close);
  close->super.handler = do_channel_close;
748
  close->table = table;
Niels Möller's avatar
Niels Möller committed
749
750
  connection->dispatch[SSH_MSG_CHANNEL_CLOSE] = &close->super;

751
752
753
754
  NEW(open_confirm);
  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
755

756
757
758
759
  NEW(open_failure);
  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
760
  
761
762
763
764
765
766
767
768
769
770
  NEW(channel_success);
  channel_success->super.handler = do_channel_success;
  channel_success->table = table;
  connection->dispatch[SSH_MSG_CHANNEL_SUCCESS] = &channel_success->super;

  NEW(channel_failure);
  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
771
772
  return self->start
    ? CONNECTION_START(self->start, table, connection->write)
773
    : LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
774
775
}

776
777
778
struct ssh_service *make_connection_service(struct alist *global_requests,
					    struct alist *channel_types,
					    struct connection_startup *start)
779
{
780
  struct connection_service *self;
781

782
  NEW(self);
783

784
785
786
787
788
789
  self->super.init = init_connection_service;
  self->global_requests = global_requests;
  self->channel_types = channel_types;
  self->start = start;
  
  return &self->super;
790
791
}

792
793
struct lsh_string *channel_transmit_data(struct ssh_channel *channel,
					 struct lsh_string *data)
794
{
795
796
797
798
799
800
801
  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);
802
803
}

804
805
806
struct lsh_string *channel_transmit_extended(struct ssh_channel *channel,
					     UINT32 type,
					     struct lsh_string *data)
807
{
808
809
  assert(data->length <= channel->send_window_size);
  assert(data->length <= channel->send_max_packet);
810
  
811
812
813
814
815
  return ssh_format("%c%i%i%fS",
		    SSH_MSG_CHANNEL_EXTENDED_DATA,
		    type,
		    channel->channel_number,
		    data);
816
817
}

818
819
static int do_read_channel(struct read_handler **h,
			   struct abstract_read *read)
Niels Möller's avatar
Niels Möller committed
820
{
821
822
823
824
825
826
  struct ssh_channel *closure = (struct ssh_channel *) *h;
  int to_read;
  int n;
  struct lsh_string *packet;
  
  MDEBUG_SUBTYPE(closure);
Niels Möller's avatar
Niels Möller committed
827

828
  to_read = MIN(closure->send_max_packet, closure->send_window_size);
Niels Möller's avatar
Niels Möller committed
829

830
831
832
833
834
835
836
837
838
  if (!to_read)
    {
      /* Stop reading */
      *h = NULL;
      return LSH_OK | LSH_GOON;
    }
  
  packet = lsh_string_alloc(to_read);
  n = A_READ(read, to_read, packet->data);
Niels Möller's avatar
Niels Möller committed
839

840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
  switch(n)
    {
    case 0:
      lsh_string_free(packet);
      return LSH_OK | LSH_GOON;
    case A_FAIL:
      /* Send a channel close, and prepare the channel for closing */      
      channel_close(channel);
      return LSH_FAIL | LSH_DIE;
    case A_EOF:
      /* Send eof (but no close). */
      channel_eof(channel);
      return LSH_OK | LSH_DIE;
    default:
      packet->length = n;

      /* FIXME: Should we consider the error code here? */
      return A_WRITE(closure->write, channel_transmit_data(closure, packet));
    }
}

void init_channel(struct ssh_channel *channel, struct abstract_write *write)
{
  channel->super.handler = do_read_channel;
  channel->write = write;
  
  channel->request_types = NULL;
  channel->recieve = NULL;
  channel->send = NULL;
  channel->close = NULL;
  channel->eof = NULL;
  channel->open_confirm = NULL;
  channel->open_failure = NULL;
  channel->channel_success = NULL;
  channel->channel_failure = NULL;
Niels Möller's avatar
Niels Möller committed
875
}
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921

struct lsh_string *prepare_channel_open(struct channel_table *table,
					int type, struct ssh_channel *channel,
					char *format, ...)
{
  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);
  ssh_format_write(format, l2, packet->data+l1, args);
  va_end(args);

  return packet;
#undef OPEN_FORMAT
#undef OPEN_ARGS
}
		   
struct lsh_string *format_channel_request(int type, struct ssh_channel *channel,
					  int want_reply, char *format, ...)
{
  va_list args;
  UINT32 l1, l2;
  struct lsh_string *packet;

#define REQUEST_FORMAT "%c%i%a%c"
Niels Möller's avatar
Niels Möller committed
922
#define REQUEST_ARGS SSH_MSG_CHANNEL_REQUEST, channel->channel_number, \
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
  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);
  ssh_format_write(format, l2, packet->data+l1, args);
  va_end(args);

  return packet;
#undef REQUEST_FORMAT
#undef REQUEST_ARGS
}