summaryrefslogtreecommitdiff
path: root/source3/smbd/ipc.c
blob: 9d347a430bece263c83d8fa3a67eaa52b147927e (plain)
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
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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
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
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
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
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
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
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
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
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
/* 
   Unix SMB/CIFS implementation.
   Inter-process communication and named pipe handling
   Copyright (C) Andrew Tridgell 1992-1998

   SMB Version handling
   Copyright (C) John H Terpstra 1995-1998
   
   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.
   */
/*
   This file handles the named pipe and mailslot calls
   in the SMBtrans protocol
   */

#include "includes.h"

extern int max_send;

#define NERR_notsupported 50

extern int smb_read_error;

/*******************************************************************
 copies parameters and data, as needed, into the smb buffer

 *both* the data and params sections should be aligned.  this
 is fudged in the rpc pipes by 
 at present, only the data section is.  this may be a possible
 cause of some of the ipc problems being experienced.  lkcl26dec97

 ******************************************************************/

static void copy_trans_params_and_data(char *outbuf, int align,
				char *rparam, int param_offset, int param_len,
				char *rdata, int data_offset, int data_len)
{
	char *copy_into = smb_buf(outbuf)+1;

	if(param_len < 0)
		param_len = 0;

	if(data_len < 0)
		data_len = 0;

	DEBUG(5,("copy_trans_params_and_data: params[%d..%d] data[%d..%d]\n",
			param_offset, param_offset + param_len,
			data_offset , data_offset  + data_len));

	if (param_len)
		memcpy(copy_into, &rparam[param_offset], param_len);

	copy_into += param_len + align;

	if (data_len )
		memcpy(copy_into, &rdata[data_offset], data_len);
}

/****************************************************************************
 Send a trans reply.
 ****************************************************************************/

void send_trans_reply(char *outbuf,
				char *rparam, int rparam_len,
				char *rdata, int rdata_len,
				BOOL buffer_too_large)
{
	int this_ldata,this_lparam;
	int tot_data_sent = 0;
	int tot_param_sent = 0;
	int align;

	int ldata  = rdata  ? rdata_len : 0;
	int lparam = rparam ? rparam_len : 0;

	if (buffer_too_large)
		DEBUG(5,("send_trans_reply: buffer %d too large\n", ldata ));

	this_lparam = MIN(lparam,max_send - 500); /* hack */
	this_ldata  = MIN(ldata,max_send - (500+this_lparam));

	align = ((this_lparam)%4);

	if (buffer_too_large) {
		ERROR_BOTH(STATUS_BUFFER_OVERFLOW,ERRDOS,ERRmoredata);
	}

	set_message(outbuf,10,1+align+this_ldata+this_lparam,True);

	copy_trans_params_and_data(outbuf, align,
								rparam, tot_param_sent, this_lparam,
								rdata, tot_data_sent, this_ldata);

	SSVAL(outbuf,smb_vwv0,lparam);
	SSVAL(outbuf,smb_vwv1,ldata);
	SSVAL(outbuf,smb_vwv3,this_lparam);
	SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
	SSVAL(outbuf,smb_vwv5,0);
	SSVAL(outbuf,smb_vwv6,this_ldata);
	SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
	SSVAL(outbuf,smb_vwv8,0);
	SSVAL(outbuf,smb_vwv9,0);

	show_msg(outbuf);
	if (!send_smb(smbd_server_fd(),outbuf))
		exit_server("send_trans_reply: send_smb failed.");

	tot_data_sent = this_ldata;
	tot_param_sent = this_lparam;

	while (tot_data_sent < ldata || tot_param_sent < lparam)
	{
		this_lparam = MIN(lparam-tot_param_sent, max_send - 500); /* hack */
		this_ldata  = MIN(ldata -tot_data_sent, max_send - (500+this_lparam));

		if(this_lparam < 0)
			this_lparam = 0;

		if(this_ldata < 0)
			this_ldata = 0;

		align = (this_lparam%4);

		set_message(outbuf,10,1+this_ldata+this_lparam+align,False);

		copy_trans_params_and_data(outbuf, align,
					   rparam, tot_param_sent, this_lparam,
					   rdata, tot_data_sent, this_ldata);
		
		SSVAL(outbuf,smb_vwv3,this_lparam);
		SSVAL(outbuf,smb_vwv4,smb_offset(smb_buf(outbuf)+1,outbuf));
		SSVAL(outbuf,smb_vwv5,tot_param_sent);
		SSVAL(outbuf,smb_vwv6,this_ldata);
		SSVAL(outbuf,smb_vwv7,smb_offset(smb_buf(outbuf)+1+this_lparam+align,outbuf));
		SSVAL(outbuf,smb_vwv8,tot_data_sent);
		SSVAL(outbuf,smb_vwv9,0);

		show_msg(outbuf);
		if (!send_smb(smbd_server_fd(),outbuf))
			exit_server("send_trans_reply: send_smb failed.");

		tot_data_sent  += this_ldata;
		tot_param_sent += this_lparam;
	}
}

/****************************************************************************
 Start the first part of an RPC reply which began with an SMBtrans request.
****************************************************************************/

static BOOL api_rpc_trans_reply(char *outbuf, smb_np_struct *p)
{
	BOOL is_data_outstanding;
	char *rdata = (char *)SMB_MALLOC(p->max_trans_reply);
	int data_len;

	if(rdata == NULL) {
		DEBUG(0,("api_rpc_trans_reply: malloc fail.\n"));
		return False;
	}

	if((data_len = read_from_pipe( p, rdata, p->max_trans_reply,
					&is_data_outstanding)) < 0) {
		SAFE_FREE(rdata);
		return False;
	}

	send_trans_reply(outbuf, NULL, 0, rdata, data_len, is_data_outstanding);

	SAFE_FREE(rdata);
	return True;
}

/****************************************************************************
 WaitNamedPipeHandleState 
****************************************************************************/

static BOOL api_WNPHS(char *outbuf, smb_np_struct *p, char *param, int param_len)
{
	uint16 priority;

	if (!param || param_len < 2)
		return False;

	priority = SVAL(param,0);
	DEBUG(4,("WaitNamedPipeHandleState priority %x\n", priority));

	if (wait_rpc_pipe_hnd_state(p, priority)) {
		/* now send the reply */
		send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
		return True;
	}
	return False;
}


/****************************************************************************
 SetNamedPipeHandleState 
****************************************************************************/

static BOOL api_SNPHS(char *outbuf, smb_np_struct *p, char *param, int param_len)
{
	uint16 id;

	if (!param || param_len < 2)
		return False;

	id = SVAL(param,0);
	DEBUG(4,("SetNamedPipeHandleState to code %x\n", id));

	if (set_rpc_pipe_hnd_state(p, id)) {
		/* now send the reply */
		send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
		return True;
	}
	return False;
}


/****************************************************************************
 When no reply is generated, indicate unsupported.
 ****************************************************************************/

static BOOL api_no_reply(char *outbuf, int max_rdata_len)
{
	char rparam[4];

	/* unsupported */
	SSVAL(rparam,0,NERR_notsupported);
	SSVAL(rparam,2,0); /* converter word */

	DEBUG(3,("Unsupported API fd command\n"));

	/* now send the reply */
	send_trans_reply(outbuf, rparam, 4, NULL, 0, False);

	return -1;
}

/****************************************************************************
 Handle remote api calls delivered to a named pipe already opened.
 ****************************************************************************/

static int api_fd_reply(connection_struct *conn,uint16 vuid,char *outbuf,
		 	uint16 *setup,char *data,char *params,
		 	int suwcnt,int tdscnt,int tpscnt,int mdrcnt,int mprcnt)
{
	BOOL reply = False;
	smb_np_struct *p = NULL;
	int pnum;
	int subcommand;

	DEBUG(5,("api_fd_reply\n"));

	/* First find out the name of this file. */
	if (suwcnt != 2) {
		DEBUG(0,("Unexpected named pipe transaction.\n"));
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}

	/* Get the file handle and hence the file name. */
	/* 
	 * NB. The setup array has already been transformed
	 * via SVAL and so is in gost byte order.
	 */
	pnum = ((int)setup[1]) & 0xFFFF;
	subcommand = ((int)setup[0]) & 0xFFFF;

	if(!(p = get_rpc_pipe(pnum))) {
		if (subcommand == TRANSACT_WAITNAMEDPIPEHANDLESTATE) {
			/* Win9x does this call with a unicode pipe name, not a pnum. */
			/* Just return success for now... */
			DEBUG(3,("Got TRANSACT_WAITNAMEDPIPEHANDLESTATE on text pipe name\n"));
			send_trans_reply(outbuf, NULL, 0, NULL, 0, False);
			return -1;
		}

		DEBUG(1,("api_fd_reply: INVALID PIPE HANDLE: %x\n", pnum));
		return ERROR_NT(NT_STATUS_INVALID_HANDLE);
	}

	if (vuid != p->vuid) {
		DEBUG(1, ("Got pipe request (pnum %x) using invalid VUID %d, "
			  "expected %d\n", pnum, vuid, p->vuid));
		return ERROR_NT(NT_STATUS_INVALID_HANDLE);
	}

	DEBUG(3,("Got API command 0x%x on pipe \"%s\" (pnum %x)\n", subcommand, p->name, pnum));

	/* record maximum data length that can be transmitted in an SMBtrans */
	p->max_trans_reply = mdrcnt;

	DEBUG(10,("api_fd_reply: p:%p max_trans_reply: %d\n", p, p->max_trans_reply));

	switch (subcommand) {
	case TRANSACT_DCERPCCMD:
		/* dce/rpc command */
		reply = write_to_pipe(p, data, tdscnt);
		if (reply)
			reply = api_rpc_trans_reply(outbuf, p);
		break;
	case TRANSACT_WAITNAMEDPIPEHANDLESTATE:
		/* Wait Named Pipe Handle state */
		reply = api_WNPHS(outbuf, p, params, tpscnt);
		break;
	case TRANSACT_SETNAMEDPIPEHANDLESTATE:
		/* Set Named Pipe Handle state */
		reply = api_SNPHS(outbuf, p, params, tpscnt);
		break;
	default:
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}

	if (!reply)
		return api_no_reply(outbuf, mdrcnt);

	return -1;
}

/****************************************************************************
  handle named pipe commands
  ****************************************************************************/
static int named_pipe(connection_struct *conn,uint16 vuid, char *outbuf,char *name,
		      uint16 *setup,char *data,char *params,
		      int suwcnt,int tdscnt,int tpscnt,
		      int msrcnt,int mdrcnt,int mprcnt)
{
	DEBUG(3,("named pipe command on <%s> name\n", name));

	if (strequal(name,"LANMAN"))
		return api_reply(conn,vuid,outbuf,data,params,tdscnt,tpscnt,mdrcnt,mprcnt);

	if (strequal(name,"WKSSVC") ||
	    strequal(name,"SRVSVC") ||
	    strequal(name,"WINREG") ||
	    strequal(name,"SAMR") ||
	    strequal(name,"LSARPC"))
	{
		DEBUG(4,("named pipe command from Win95 (wow!)\n"));
		return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);
	}

	if (strlen(name) < 1)
		return api_fd_reply(conn,vuid,outbuf,setup,data,params,suwcnt,tdscnt,tpscnt,mdrcnt,mprcnt);

	if (setup)
		DEBUG(3,("unknown named pipe: setup 0x%X setup1=%d\n", (int)setup[0],(int)setup[1]));

	return 0;
}

static NTSTATUS handle_trans(connection_struct *conn,
			     struct trans_state *state,
			     char *outbuf, int *outsize)
{
	char *local_machine_name;
	int name_offset = 0;

	DEBUG(3,("trans <%s> data=%u params=%u setup=%u\n",
		 state->name,(unsigned int)state->total_data,(unsigned int)state->total_param,
		 (unsigned int)state->setup_count));

	/*
	 * WinCE wierdness....
	 */

	local_machine_name = talloc_asprintf(state, "\\%s\\",
					     get_local_machine_name());

	if (local_machine_name == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	if (strnequal(state->name, local_machine_name,
		      strlen(local_machine_name))) {
		name_offset = strlen(local_machine_name)-1;
	}

	if (!strnequal(&state->name[name_offset], "\\PIPE",
		       strlen("\\PIPE"))) {
		return NT_STATUS_NOT_SUPPORTED;
	}
	
	name_offset += strlen("\\PIPE");

	/* Win9x weirdness.  When talking to a unicode server Win9x
	   only sends \PIPE instead of \PIPE\ */

	if (state->name[name_offset] == '\\')
		name_offset++;

	DEBUG(5,("calling named_pipe\n"));
	*outsize = named_pipe(conn, state->vuid, outbuf,
			      state->name+name_offset,
			      state->setup,state->data,
			      state->param,
			      state->setup_count,state->total_data,
			      state->total_param,
			      state->max_setup_return,
			      state->max_data_return,
			      state->max_param_return);

	if (*outsize == 0) {
		return NT_STATUS_NOT_SUPPORTED;
	}

	if (state->close_on_completion)
		close_cnum(conn,state->vuid);

	return NT_STATUS_OK;
}

/****************************************************************************
 Reply to a SMBtrans.
 ****************************************************************************/

int reply_trans(connection_struct *conn, char *inbuf,char *outbuf,
		int size, int bufsize)
{
	int outsize = 0;
	unsigned int dsoff = SVAL(inbuf, smb_dsoff);
	unsigned int dscnt = SVAL(inbuf, smb_dscnt);
	unsigned int psoff = SVAL(inbuf, smb_psoff);
	unsigned int pscnt = SVAL(inbuf, smb_pscnt);
	struct trans_state *state;
	NTSTATUS result;

	START_PROFILE(SMBtrans);

	result = allow_new_trans(conn->pending_trans, SVAL(inbuf, smb_mid));
	if (!NT_STATUS_IS_OK(result)) {
		DEBUG(2, ("Got invalid trans request: %s\n",
			  nt_errstr(result)));
		END_PROFILE(SMBtrans);
		return ERROR_NT(result);
	}

	if ((state = TALLOC_P(conn->mem_ctx, struct trans_state)) == NULL) {
		DEBUG(0, ("talloc failed\n"));
		END_PROFILE(SMBtrans);
		return ERROR_NT(NT_STATUS_NO_MEMORY);
	}

	state->cmd = SMBtrans;

	state->mid = SVAL(inbuf, smb_mid);
	state->vuid = SVAL(inbuf, smb_uid);
	state->setup_count = CVAL(inbuf, smb_suwcnt);
	state->setup = NULL;
	state->total_param = SVAL(inbuf, smb_tpscnt);
	state->param = NULL;
	state->total_data = SVAL(inbuf, smb_tdscnt);
	state->data = NULL;
	state->max_param_return = SVAL(inbuf, smb_mprcnt);
	state->max_data_return = SVAL(inbuf, smb_mdrcnt);
	state->max_setup_return = CVAL(inbuf, smb_msrcnt);
	state->close_on_completion = BITSETW(inbuf+smb_vwv5,0);
	state->one_way = BITSETW(inbuf+smb_vwv5,1);

	memset(state->name, '\0',sizeof(state->name));
	srvstr_pull_buf(inbuf, state->name, smb_buf(inbuf),
			sizeof(state->name), STR_TERMINATE);
	
	if ((dscnt > state->total_data) || (pscnt > state->total_param))
		goto bad_param;

	if (state->total_data)  {
		/* Can't use talloc here, the core routines do realloc on the
		 * params and data. */
		state->data = (char *)SMB_MALLOC(state->total_data);
		if (state->data == NULL) {
			DEBUG(0,("reply_trans: data malloc fail for %u "
				 "bytes !\n", (unsigned int)state->total_data));
			TALLOC_FREE(state);
			END_PROFILE(SMBtrans);
			return(ERROR_DOS(ERRDOS,ERRnomem));
		} 
		if ((dsoff+dscnt < dsoff) || (dsoff+dscnt < dscnt))
			goto bad_param;
		if ((smb_base(inbuf)+dsoff+dscnt > inbuf + size) ||
		    (smb_base(inbuf)+dsoff+dscnt < smb_base(inbuf)))
			goto bad_param;

		memcpy(state->data,smb_base(inbuf)+dsoff,dscnt);
	}

	if (state->total_param) {
		/* Can't use talloc here, the core routines do realloc on the
		 * params and data. */
		state->param = (char *)SMB_MALLOC(state->total_param);
		if (state->param == NULL) {
			DEBUG(0,("reply_trans: param malloc fail for %u "
				 "bytes !\n", (unsigned int)state->total_param));
			SAFE_FREE(state->data);
			TALLOC_FREE(state);
			END_PROFILE(SMBtrans);
			return(ERROR_DOS(ERRDOS,ERRnomem));
		} 
		if ((psoff+pscnt < psoff) || (psoff+pscnt < pscnt))
			goto bad_param;
		if ((smb_base(inbuf)+psoff+pscnt > inbuf + size) ||
		    (smb_base(inbuf)+psoff+pscnt < smb_base(inbuf)))
			goto bad_param;

		memcpy(state->param,smb_base(inbuf)+psoff,pscnt);
	}

	state->received_data  = dscnt;
	state->received_param = pscnt;

	if (state->setup_count) {
		unsigned int i;
		if((state->setup = TALLOC_ARRAY(
			    state, uint16, state->setup_count)) == NULL) {
			DEBUG(0,("reply_trans: setup malloc fail for %u "
				 "bytes !\n", (unsigned int)
				 (state->setup_count * sizeof(uint16))));
			TALLOC_FREE(state);
			END_PROFILE(SMBtrans);
			return(ERROR_DOS(ERRDOS,ERRnomem));
		} 
		if (inbuf+smb_vwv14+(state->setup_count*SIZEOFWORD) >
		    inbuf + size)
			goto bad_param;
		if ((smb_vwv14+(state->setup_count*SIZEOFWORD) < smb_vwv14) ||
		    (smb_vwv14+(state->setup_count*SIZEOFWORD) <
		     (state->setup_count*SIZEOFWORD)))
			goto bad_param;

		for (i=0;i<state->setup_count;i++)
			state->setup[i] = SVAL(inbuf,smb_vwv14+i*SIZEOFWORD);
	}

	state->received_param = pscnt;

	if ((state->received_param == state->total_param) &&
	    (state->received_data == state->total_data)) {

		result = handle_trans(conn, state, outbuf, &outsize);

		SAFE_FREE(state->data);
		SAFE_FREE(state->param);
		TALLOC_FREE(state);

		if (!NT_STATUS_IS_OK(result)) {
			END_PROFILE(SMBtrans);
			return ERROR_NT(result);
		}

		if (outsize == 0) {
			END_PROFILE(SMBtrans);
			return ERROR_NT(NT_STATUS_INTERNAL_ERROR);
		}

		END_PROFILE(SMBtrans);
		return outsize;
	}

	DLIST_ADD(conn->pending_trans, state);

	/* We need to send an interim response then receive the rest
	   of the parameter/data bytes */
	outsize = set_message(outbuf,0,0,True);
	show_msg(outbuf);
	END_PROFILE(SMBtrans);
	return outsize;

  bad_param:

	DEBUG(0,("reply_trans: invalid trans parameters\n"));
	SAFE_FREE(state->data);
	SAFE_FREE(state->param);
	TALLOC_FREE(state);
	END_PROFILE(SMBtrans);
	return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
}

/****************************************************************************
 Reply to a secondary SMBtrans.
 ****************************************************************************/

int reply_transs(connection_struct *conn, char *inbuf,char *outbuf,
		 int size, int bufsize)
{
	int outsize = 0;
	unsigned int pcnt,poff,dcnt,doff,pdisp,ddisp;
	struct trans_state *state;
	NTSTATUS result;

	START_PROFILE(SMBtranss);

	show_msg(inbuf);

	for (state = conn->pending_trans; state != NULL;
	     state = state->next) {
		if (state->mid == SVAL(inbuf,smb_mid)) {
			break;
		}
	}

	if ((state == NULL) || (state->cmd != SMBtrans)) {
		END_PROFILE(SMBtranss);
		return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
	}

	/* Revise total_params and total_data in case they have changed
	 * downwards */

	if (SVAL(inbuf, smb_vwv0) < state->total_param)
		state->total_param = SVAL(inbuf,smb_vwv0);
	if (SVAL(inbuf, smb_vwv1) < state->total_data)
		state->total_data = SVAL(inbuf,smb_vwv1);

	pcnt = SVAL(inbuf, smb_spscnt);
	poff = SVAL(inbuf, smb_spsoff);
	pdisp = SVAL(inbuf, smb_spsdisp);

	dcnt = SVAL(inbuf, smb_sdscnt);
	doff = SVAL(inbuf, smb_sdsoff);
	ddisp = SVAL(inbuf, smb_sdsdisp);

	state->received_param += pcnt;
	state->received_data += dcnt;
		
	if ((state->received_data > state->total_data) ||
	    (state->received_param > state->total_param))
		goto bad_param;
		
	if (pcnt) {
		if (pdisp+pcnt > state->total_param)
			goto bad_param;
		if ((pdisp+pcnt < pdisp) || (pdisp+pcnt < pcnt))
			goto bad_param;
		if (pdisp > state->total_param)
			goto bad_param;
		if ((smb_base(inbuf) + poff + pcnt > inbuf + size) ||
		    (smb_base(inbuf) + poff + pcnt < smb_base(inbuf)))
			goto bad_param;
		if (state->param + pdisp < state->param)
			goto bad_param;

		memcpy(state->param+pdisp,smb_base(inbuf)+poff,
		       pcnt);
	}

	if (dcnt) {
		if (ddisp+dcnt > state->total_data)
			goto bad_param;
		if ((ddisp+dcnt < ddisp) || (ddisp+dcnt < dcnt))
			goto bad_param;
		if (ddisp > state->total_data)
			goto bad_param;
		if ((smb_base(inbuf) + doff + dcnt > inbuf + size) ||
		    (smb_base(inbuf) + doff + dcnt < smb_base(inbuf)))
			goto bad_param;
		if (state->data + ddisp < state->data)
			goto bad_param;

		memcpy(state->data+ddisp, smb_base(inbuf)+doff,
		       dcnt);      
	}

	if ((state->received_param < state->total_param) ||
	    (state->received_data < state->total_data)) {
		END_PROFILE(SMBtranss);
		return -1;
	}

	/* construct_reply_common has done us the favor to pre-fill the
	 * command field with SMBtranss which is wrong :-)
	 */
	SCVAL(outbuf,smb_com,SMBtrans);

	result = handle_trans(conn, state, outbuf, &outsize);

	DLIST_REMOVE(conn->pending_trans, state);
	SAFE_FREE(state->data);
	SAFE_FREE(state->param);
	TALLOC_FREE(state);

	if ((outsize == 0) || !NT_STATUS_IS_OK(result)) {
		END_PROFILE(SMBtranss);
		return(ERROR_DOS(ERRSRV,ERRnosupport));
	}
	
	END_PROFILE(SMBtranss);
	return(outsize);

  bad_param:

	DEBUG(0,("reply_transs: invalid trans parameters\n"));
	DLIST_REMOVE(conn->pending_trans, state);
	SAFE_FREE(state->data);
	SAFE_FREE(state->param);
	TALLOC_FREE(state);
	END_PROFILE(SMBtranss);
	return ERROR_NT(NT_STATUS_INVALID_PARAMETER);
}