channel.c 30.6 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
/* 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
36
37
38
39
40
41
42
43
#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;
44
45
46
47

  /* 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
48
49
};

50
struct channel_handler
Niels Möller's avatar
Niels Möller committed
51
52
53
{
  struct packet_handler super;
  
54
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
55
56
57
58
};

struct global_request_handler
{
59
  struct channel_handler super;
Niels Möller's avatar
Niels Möller committed
60
61
62
63
64
65
  
  struct alist *global_requests;
};

struct channel_open_handler
{
66
  struct channel_handler super;
Niels Möller's avatar
Niels Möller committed
67
68
69
70
71
72
73

  struct alist *channel_types;
};

#if 0
struct channel_request_handler
{
74
  struct channel_handler *super;
Niels Möller's avatar
Niels Möller committed
75
76
77
78
79
80
81
82
83
84

  struct alist *request_types;
};
#endif

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

85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
struct lsh_string *format_open_confirmation(struct ssh_channel *channel,
					    UINT32 channel_number,
					    char *format, ...)
{
  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);
108
  ssh_vformat_write(format, l2, packet->data+l1, args);
109
110
111
112
113
114
115
  va_end(args);

  return packet;
#undef CONFIRM_FORMAT
#undef CONFIRM_ARGS
}

Niels Möller's avatar
Niels Möller committed
116
117
118
119
120
121
122
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);
}

123
124
125
126
127
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
128
129
130
131
132
struct lsh_string *format_channel_failure(UINT32 channel)
{
  return ssh_format("%c%i", SSH_MSG_CHANNEL_FAILURE, channel);
}

133
134
135
136
137
138
139
140
141
142
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);
}

143
/* Channel objects */
Niels Möller's avatar
Niels Möller committed
144
145
146
147
148

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

Niels Möller's avatar
Niels Möller committed
149
struct channel_table *make_channel_table(void)
Niels Möller's avatar
Niels Möller committed
150
{
151
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
152

153
154
  NEW(table);
  table->channels = lsh_space_alloc(sizeof(struct ssh_channel *)
155
				      * INITIAL_CHANNELS);
156
157
158
159
  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
160

161
  return table;
Niels Möller's avatar
Niels Möller committed
162
163
164
};

/* Returns -1 if allocation fails */
165
int alloc_channel(struct channel_table *table)
Niels Möller's avatar
Niels Möller committed
166
167
{
  int i;
168
  for(i = table->next_channel; i < table->used_channels; i++)
Niels Möller's avatar
Niels Möller committed
169
    {
170
      if (!table->channels[i])
Niels Möller's avatar
Niels Möller committed
171
	{
172
	  table->next_channel = i+1;
Niels Möller's avatar
Niels Möller committed
173
174
175
	  return i;
	}
    }
176
  if (i == table->max_channels)
Niels Möller's avatar
Niels Möller committed
177
    return -1;
178
  if (i == table->allocated_channels) 
Niels Möller's avatar
Niels Möller committed
179
    {
180
      int new_size = table->allocated_channels * 2;
Niels Möller's avatar
Niels Möller committed
181
      struct ssh_channel **new
182
	= lsh_space_alloc(sizeof(struct ssh_channel *) * new_size);
Niels Möller's avatar
Niels Möller committed
183

184
185
      memcpy(new, table->channels,
	     sizeof(struct ssh_channel *) * table->used_channels);
Niels Möller's avatar
Niels Möller committed
186
      
187
188
      table->channels = new;
      table->allocated_channels = new_size;
Niels Möller's avatar
Niels Möller committed
189
190
    }

191
  table->next_channel = table->used_channels = i+1;
Niels Möller's avatar
Niels Möller committed
192
193
194
195

  return i;
}

196
void dealloc_channel(struct channel_table *table, int i)
Niels Möller's avatar
Niels Möller committed
197
198
{
  assert(i >= 0);
199
  assert(i < table->used_channels);
Niels Möller's avatar
Niels Möller committed
200
  
201
202
203
204
205
206
207
208
209
210
211
212
  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
213

214
  return n;
Niels Möller's avatar
Niels Möller committed
215
216
}

217
struct ssh_channel *lookup_channel(struct channel_table *table, UINT32 i)
Niels Möller's avatar
Niels Möller committed
218
{
219
220
  return (i < table->used_channels)
    ? table->channels[i] : NULL;
Niels Möller's avatar
Niels Möller committed
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
266
267
268
}

/* 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;
269
270
271
  UINT32 remote_channel_number;
  UINT32 window_size;
  UINT32 max_packet;
Niels Möller's avatar
Niels Möller committed
272
273
274
275
276
277
278
279
  
  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)
280
281
282
      && parse_uint32(&buffer, &remote_channel_number)
      && parse_uint32(&buffer, &window_size)
      && parse_uint32(&buffer, &max_packet))
Niels Möller's avatar
Niels Möller committed
283
284
    {
      struct channel_open *open;
285
286
287
288
289
290
291
      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
292
293
294
295
      lsh_string_free(packet);
      
      if (!type || !(open = ALIST_GET(closure->channel_types, type)))
	return A_WRITE(connection->write,
296
		       format_open_failure(remote_channel_number,
Niels Möller's avatar
Niels Möller committed
297
298
					   SSH_OPEN_UNKNOWN_CHANNEL_TYPE,
					   "Unknown channel type", ""));
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
324
325
326
327
328
329
330
331
332
333
      
      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)
		     : format_open_confirmation(channel, local_channel_number, ""));
Niels Möller's avatar
Niels Möller committed
334
335
336
337
338
339
340
341
342
343
    }
  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)
{
344
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361

  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))
    {
362
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
363
364
365
366
367
368
369
370
						   channel_number);

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

371
372
373
374
	  if (type && channel->request_types 
	      && ( (req = ALIST_GET(channel->request_types, type)) ))
	    return CHANNEL_REQUEST(req, channel, want_reply, &buffer);
	  else
375
376
377
378
379
	    return want_reply
	      ? A_WRITE(connection->write,
			format_channel_failure(channel->channel_number))
	      : LSH_OK | LSH_GOON;
	  
Niels Möller's avatar
Niels Möller committed
380
381
382
383
384
385
386
387
388
389
390
391
	}
      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,
392
			    struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
393
{
394
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
395
396
397
398
399
400
401
402
403
404
405
406

  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)
407
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
408
409
410
      && parse_uint32(&buffer, &size)
      && parse_eod(&buffer))
    {
411
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
412
413
414
415
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
416
417
      if (channel
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
418
	{
Niels Möller's avatar
Niels Möller committed
419
420
421
422
423
424
	  if (! (channel->flags & CHANNEL_SENT_CLOSE))
	    {
	      channel->send_window_size += size;
	      if (channel->send_window_size && channel->send)
		CHANNEL_SEND(channel);
	    }
Niels Möller's avatar
Niels Möller committed
425
426
427
428
	  return LSH_OK | LSH_GOON;
	}
      /* FIXME: What to do now? Should unknown channel numbers be
       * ignored silently? */
Niels Möller's avatar
Niels Möller committed
429
      werror("SSH_MSG_CHANNEL_WINDOW_ADJUST on nonexistant or closed channel %d\n",
Niels Möller's avatar
Niels Möller committed
430
431
432
433
434
435
436
437
438
439
440
441
	     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)
{
442
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
443
444
445
446
447
448
449
450
451
452
453
454

  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)
455
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
456
457
458
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
459
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
460
461
462
463
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
464
465
      if (channel && channel->recieve
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
466
	{
Niels Möller's avatar
Niels Möller committed
467
	  if (channel->flags & CHANNEL_SENT_CLOSE)
Niels Möller's avatar
Niels Möller committed
468
	    {
Niels Möller's avatar
Niels Möller committed
469
470
	      werror("Ignoring data on channel which is closing\n");
	      return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
471
	    }
Niels Möller's avatar
Niels Möller committed
472
473
	  else
	    {
474
475
	      int res = 0;
	      
Niels Möller's avatar
Niels Möller committed
476
477
478
479
480
481
	      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;
		}
482
483
484
485
486
487
488
489
490
491
492
493
494
	      channel->rec_window_size -= data->length;

	      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;
		}

	      return res | CHANNEL_RECIEVE(channel, 
					   CHANNEL_DATA, data);
Niels Möller's avatar
Niels Möller committed
495
496
	    }
	  return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
	}
	  
      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)
{
513
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
514
515
516
517
518
519
520
521
522
523
524
525
526

  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)
527
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
528
529
530
531
      && parse_uint32(&buffer, &type)
      && ( (data = parse_string_copy(&buffer)) )
      && parse_eod(&buffer))
    {
532
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
533
534
535
536
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
537
538
      if (channel && channel->recieve
	  && !(channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_RECIEVED_CLOSE)))
Niels Möller's avatar
Niels Möller committed
539
	{
Niels Möller's avatar
Niels Möller committed
540
	  if (channel->flags & CHANNEL_SENT_CLOSE)
Niels Möller's avatar
Niels Möller committed
541
	    {
Niels Möller's avatar
Niels Möller committed
542
543
	      werror("Ignoring extended data on channel which is closing\n");
	      return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
544
	    }
Niels Möller's avatar
Niels Möller committed
545
	  else
Niels Möller's avatar
Niels Möller committed
546
	    {
547
548
	      int res = 0;
	      
Niels Möller's avatar
Niels Möller committed
549
550
551
552
553
554
555
556
557
	      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;
558
559
560
561
562
563
564
565
566
567

	      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
568
569
570
	      switch(type)
		{
		case SSH_EXTENDED_DATA_STDERR:
571
572
		  return res | CHANNEL_RECIEVE(channel, 
					       CHANNEL_STDERR_DATA, data);
Niels Möller's avatar
Niels Möller committed
573
574
575
576
577
578
		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
579
580
581
582
583
584
585
586
587
588
589
590
591
	    }
	}
      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,
592
593
			  struct ssh_connection *connection,
			  struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
594
{
595
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
596
597
598
599
600
601
602
603
604
605
606

  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)
607
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
608
609
      && parse_eod(&buffer))
    {
610
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
611
612
613
614
						   channel_number);

      lsh_string_free(packet);

Niels Möller's avatar
Niels Möller committed
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
      if (channel)
	{
	  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;
	  
	  if (channel->flags & CHANNEL_SENT_CLOSE)
	    /* Do nothing */
	    return LSH_OK | LSH_GOON;

	  if (channel->flags & CHANNEL_SENT_EOF)
	    {
	      /* Both parties have sent EOF. Initiate close, if we
	       * havn't done that already. */

	      return (channel->flags & CHANNEL_SENT_CLOSE)
		? LSH_OK | LSH_GOON
		: channel_close(channel);
	    }
638
	  return LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
639
640
641
642
	}
      werror("EOF on non-existant channel %d\n",
	     channel_number);
      return LSH_FAIL | LSH_DIE;
Niels Möller's avatar
Niels Möller committed
643
    }
Niels Möller's avatar
Niels Möller committed
644
      
Niels Möller's avatar
Niels Möller committed
645
646
647
648
649
650
651
652
  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)
{
653
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
654
655
656
657
658
659
660
661
662
663
664

  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)
665
      && parse_uint32(&buffer, &channel_number)
Niels Möller's avatar
Niels Möller committed
666
667
      && parse_eod(&buffer))
    {
668
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
669
670
671
672
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
      if (channel)
	{
	  if (channel->flags & CHANNEL_RECIEVED_CLOSE)
	    {
	      werror("Recieving multiple CLOSE on channel.\n");
	      return LSH_FAIL | LSH_DIE;
	    }

	  channel->flags |= CHANNEL_RECIEVED_CLOSE;
	  
	  if (channel->flags & (CHANNEL_RECIEVED_EOF | CHANNEL_SENT_EOF))
	    {
	      werror("Unexpected channel CLOSE.\n");
	    }
	  
	  return (channel->flags & (CHANNEL_SENT_CLOSE))
	    ? LSH_OK | LSH_CHANNEL_FINISHED
	    : LSH_OK | LSH_GOON;
	}
      werror("CLOSE on non-existant channel %d\n",
	     channel_number);
      return LSH_FAIL | LSH_DIE;
Niels Möller's avatar
Niels Möller committed
695
696
697
698
699
700
      
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

701
static int do_channel_open_confirm(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
702
703
704
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
705
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725

  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))
    {
726
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
727
728
729
730
						   local_channel_number);

      lsh_string_free(packet);

731
      if (channel && channel->open_confirm)
Niels Möller's avatar
Niels Möller committed
732
733
734
735
736
	{
	  channel->channel_number = remote_channel_number;
	  channel->send_window_size = window_size;
	  channel->send_max_packet = max_packet;

737
	  return CHANNEL_OPEN_CONFIRM(channel);
Niels Möller's avatar
Niels Möller committed
738
739
740
741
742
743
744
745
746
	}
      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;
}

747
static int do_channel_open_failure(struct packet_handler *c,
Niels Möller's avatar
Niels Möller committed
748
749
750
			      struct ssh_connection *connection,
			      struct lsh_string *packet)
{
751
  struct channel_handler *closure = (struct channel_handler *) c;
Niels Möller's avatar
Niels Möller committed
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775

  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))
    {
776
      struct ssh_channel *channel = lookup_channel(closure->table,
Niels Möller's avatar
Niels Möller committed
777
778
779
780
						   channel_number);

      /* lsh_string_free(packet); */

781
      if (channel && channel->open_failure)
Niels Möller's avatar
Niels Möller committed
782
	{
783
	  int res = CHANNEL_OPEN_FAILURE(channel);
Niels Möller's avatar
Niels Möller committed
784
785

	  lsh_string_free(packet);
786
	  dealloc_channel(closure->table, channel_number);
Niels Möller's avatar
Niels Möller committed
787
788
789
790
791
792
793
794
795
796
797
798
799
	  
	  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;
}

800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
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)
816
      && parse_uint32(&buffer, &channel_number)
817
818
819
820
821
822
823
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
824
      if (channel && channel->channel_success)
825
	return CHANNEL_SUCCESS(channel);
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
      
    }
  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)
848
      && parse_uint32(&buffer, &channel_number)
849
850
851
852
853
854
855
      && parse_eod(&buffer))
    {
      struct ssh_channel *channel = lookup_channel(closure->table,
						   channel_number);

      lsh_string_free(packet);
      
Niels Möller's avatar
Niels Möller committed
856
      if (channel && channel->channel_failure)
857
	return CHANNEL_FAILURE(channel);
858
859
860
861
862
863
      
    }
  lsh_string_free(packet);
  return LSH_FAIL | LSH_DIE;
}

864
static int init_connection_service(struct ssh_service *s,
Niels Möller's avatar
Niels Möller committed
865
				   struct ssh_connection *connection)
Niels Möller's avatar
Niels Möller committed
866
867
{
  struct connection_service *self = (struct connection_service *) s;
868
  struct channel_table *table;
Niels Möller's avatar
Niels Möller committed
869
870
871
  
  struct global_request_handler *globals;
  struct channel_open_handler *open;
872
  struct channel_handler *request;
Niels Möller's avatar
Niels Möller committed
873

874
875
876
  struct channel_handler *adjust;
  struct channel_handler *data;
  struct channel_handler *extended;
Niels Möller's avatar
Niels Möller committed
877

878
879
  struct channel_handler *eof;
  struct channel_handler *close;
Niels Möller's avatar
Niels Möller committed
880

881
882
883
884
885
  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
886
887
888

  MDEBUG(self);

889
  table = make_channel_table();
Niels Möller's avatar
Niels Möller committed
890
891
892
  
  NEW(globals);
  globals->super.super.handler = do_global_request;
893
  globals->super.table = table;
Niels Möller's avatar
Niels Möller committed
894
895
896
897
898
  globals->global_requests = self->global_requests;
  connection->dispatch[SSH_MSG_GLOBAL_REQUEST] = &globals->super.super;
    
  NEW(open);
  open->super.super.handler = do_channel_open;
899
  open->super.table = table;
Niels Möller's avatar
Niels Möller committed
900
901
902
903
904
  open->channel_types = self->channel_types;
  connection->dispatch[SSH_MSG_CHANNEL_OPEN] = &open->super.super;

  NEW(request);
  request->super.handler = do_channel_request;
905
  request->table = table;
Niels Möller's avatar
Niels Möller committed
906
907
908
909
  connection->dispatch[SSH_MSG_CHANNEL_REQUEST] = &request->super;
  
  NEW(adjust);
  adjust->super.handler = do_window_adjust;
910
  adjust->table = table;
Niels Möller's avatar
Niels Möller committed
911
912
913
914
  connection->dispatch[SSH_MSG_CHANNEL_WINDOW_ADJUST] = &adjust->super;

  NEW(data);
  data->super.handler = do_channel_data;
915
  data->table = table;
Niels Möller's avatar
Niels Möller committed
916
917
918
919
  connection->dispatch[SSH_MSG_CHANNEL_DATA] = &data->super;

  NEW(extended);
  extended->super.handler = do_channel_extended_data;
920
  extended->table = table;
Niels Möller's avatar
Niels Möller committed
921
922
923
924
  connection->dispatch[SSH_MSG_CHANNEL_WINDOW_ADJUST] = &extended->super;

  NEW(eof);
  eof->super.handler = do_channel_eof;
925
  eof->table = table;
Niels Möller's avatar
Niels Möller committed
926
927
928
929
  connection->dispatch[SSH_MSG_CHANNEL_EOF] = &eof->super;

  NEW(close);
  close->super.handler = do_channel_close;
930
  close->table = table;
Niels Möller's avatar
Niels Möller committed
931
932
  connection->dispatch[SSH_MSG_CHANNEL_CLOSE] = &close->super;

933
934
935
936
  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
937

938
939
940
941
  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
942
  
943
944
945
946
947
948
949
950
951
952
  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
953
954
  return self->start
    ? CONNECTION_START(self->start, table, connection->write)
955
    : LSH_OK | LSH_GOON;
Niels Möller's avatar
Niels Möller committed
956
957
}

958
959
960
struct ssh_service *make_connection_service(struct alist *global_requests,
					    struct alist *channel_types,
					    struct connection_startup *start)
961
{
962
  struct connection_service *self;
963

964
  NEW(self);
965

966
967
968
969
970
971
  self->super.init = init_connection_service;
  self->global_requests = global_requests;
  self->channel_types = channel_types;
  self->start = start;
  
  return &self->super;
972
973
}

Niels Möller's avatar
Niels Möller committed
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
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 ;
  
1001
  channel->flags |= CHANNEL_SENT_EOF;
Niels Möller's avatar
Niels Möller committed
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
  res =  A_WRITE(channel->write, format_channel_eof(channel));

  if (LSH_CLOSEDP(res))
    return res;

  if (channel->flags & CHANNEL_RECIEVED_EOF)
    {
      /* 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;
  
  channel->request_types = NULL;
  channel->recieve = NULL;
  channel->send = NULL;
#if 0
  channel->close = NULL;
  channel->eof = NULL;
#endif
  channel->open_confirm = NULL;
  channel->open_failure = NULL;
  channel->channel_success = NULL;
  channel->channel_failure = NULL;
}

1036
1037
struct lsh_string *channel_transmit_data(struct ssh_channel *channel,
					 struct lsh_string *data)
1038
{
1039
1040
1041
1042
1043
1044
1045
  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);
1046
1047
}

1048
1049
1050
struct lsh_string *channel_transmit_extended(struct ssh_channel *channel,
					     UINT32 type,
					     struct lsh_string *data)
1051
{
1052
1053
  assert(data->length <= channel->send_window_size);
  assert(data->length <= channel->send_max_packet);
1054
  
1055
1056
1057
1058
1059
  return ssh_format("%c%i%i%fS",
		    SSH_MSG_CHANNEL_EXTENDED_DATA,
		    type,
		    channel->channel_number,
		    data);
1060
1061
}

Niels Möller's avatar
Niels Möller committed
1062
1063
/* Writing data to a channel */
struct channel_write
Niels Möller's avatar
Niels Möller committed
1064
{
Niels Möller's avatar
Niels Möller committed
1065
1066
1067
  struct abstract_write super;
  struct ssh_channel *channel;
};
Niels Möller's avatar
Niels Möller committed
1068

Niels Möller's avatar
Niels Möller committed
1069
1070
1071
1072
1073
struct channel_write_extended
{
  struct channel_write super;
  UINT32 type;
};
Niels Möller's avatar
Niels Möller committed
1074

1075
static int do_channel_write(struct abstract_write *w,
Niels Möller's avatar
Niels Möller committed
1076
1077
			    struct lsh_string *packet)
{
1078
  struct channel_write *closure = (struct channel_write *) w;
Niels Möller's avatar
Niels Möller committed
1079

Niels Möller's avatar
Niels Möller committed
1080
1081
1082
1083
  return A_WRITE(closure->channel->write,
		 channel_transmit_data(closure->channel, packet));
}

1084
1085
static int do_channel_write_extended(struct abstract_write *w,
				     struct lsh_string *packet)
Niels Möller's avatar
Niels Möller committed
1086
{
1087
  struct channel_write_extended *closure = (struct channel_write_extended *) w;
Niels Möller's avatar
Niels Möller committed
1088
1089
1090
1091
1092

  return A_WRITE(closure->super.channel->write,
		 channel_transmit_extended(closure->super.channel,
					   closure->type,
					   packet));
1093
1094
}

Niels Möller's avatar
Niels Möller committed
1095
struct abstract_write *make_channel_write(struct ssh_channel *channel)
1096
{
Niels Möller's avatar
Niels Möller committed
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
  struct channel_write *closure;

  NEW(closure);

  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)
{
  struct channel_write_extended *closure;

  NEW(closure);

  closure->super.super.write = do_channel_write_extended;
  closure->super.channel = channel;
  closure->type = type;
1117
  
Niels Möller's avatar
Niels Möller committed
1118
  return &closure->super.super;
Niels Möller's avatar
Niels Möller committed
1119
}
1120

Niels Möller's avatar
Niels Möller committed
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
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));
}    

1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
struct channel_close_callback
{
  struct close_callback super;
  struct ssh_channel *channel;
};

static int channel_close_callback(struct close_callback *c, int reason)
{
  struct channel_close_callback *closure = (struct channel_close_callback *)c;

  MDEBUG(closure);

  channel_close(closure->channel);

  /* FIXME: So far, the returned value is ignored. */
  return 17;
}
  
struct close_callback *make_channel_close(struct ssh_channel *channel)
{
  struct channel_close_callback *closure;

  NEW(closure);
  closure->super.f = channel_close_callback;
  closure->channel = channel;

  return &closure->super;
}

1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
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);
1191
  ssh_vformat_write(format, l2, packet->data+l1, args);
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
  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
1207
#define REQUEST_ARGS SSH_MSG_CHANNEL_REQUEST, channel->channel_number, \
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
  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);
1221
  ssh_vformat_write(format, l2, packet->data+l1, args);
1222
1223
1224
1225
1226
1227
1228
  va_end(args);

  return packet;
#undef REQUEST_FORMAT
#undef REQUEST_ARGS
}