summaryrefslogtreecommitdiff
path: root/libcli/smb/smb1cli_trans.c
blob: cc4f7d3b91c4d4ca0714934ed1553c92c1295274 (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
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
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
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
/*
   Unix SMB/CIFS implementation.
   client transaction calls
   Copyright (C) Andrew Tridgell 1994-1998

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "system/network.h"
#include "../lib/util/tevent_ntstatus.h"
#include "../libcli/smb/smb_common.h"
#include "../libcli/smb/smbXcli_base.h"

struct trans_recvblob {
	uint8_t *data;
	uint32_t max, total, received;
};

struct smb1cli_trans_state {
	struct smbXcli_conn *conn;
	struct tevent_context *ev;
	uint8_t cmd;
	uint8_t additional_flags;
	uint8_t clear_flags;
	uint16_t additional_flags2;
	uint16_t clear_flags2;
	uint32_t timeout_msec;
	uint16_t mid;
	uint32_t pid;
	struct smbXcli_tcon *tcon;
	struct smbXcli_session *session;
	const char *pipe_name;
	uint8_t *pipe_name_conv;
	size_t pipe_name_conv_len;
	uint16_t fid;
	uint16_t function;
	int flags;
	uint16_t *setup;
	uint8_t num_setup, max_setup;
	uint8_t *param;
	uint32_t num_param, param_sent;
	uint8_t *data;
	uint32_t num_data, data_sent;

	uint8_t num_rsetup;
	uint16_t *rsetup;
	struct trans_recvblob rparam;
	struct trans_recvblob rdata;
	uint16_t recv_flags2;

	struct iovec iov[6];
	uint8_t pad[4];
	uint8_t zero_pad[4];
	uint16_t vwv[32];

	NTSTATUS status;

	struct tevent_req *primary_subreq;
};

static void smb1cli_trans_cleanup_primary(struct smb1cli_trans_state *state)
{
	if (state->primary_subreq) {
		smb1cli_req_set_mid(state->primary_subreq, 0);
		smbXcli_req_unset_pending(state->primary_subreq);
		TALLOC_FREE(state->primary_subreq);
	}
}

static int smb1cli_trans_state_destructor(struct smb1cli_trans_state *state)
{
	smb1cli_trans_cleanup_primary(state);
	return 0;
}

static NTSTATUS smb1cli_pull_trans(uint8_t *inhdr,
				   uint8_t wct,
				   uint16_t *vwv,
				   uint32_t vwv_ofs,
				   uint32_t num_bytes,
				   uint8_t *bytes,
				   uint32_t bytes_ofs,
				   uint8_t smb_cmd, bool expect_first_reply,
				   uint8_t *pnum_setup, uint16_t **psetup,
				   uint32_t *ptotal_param, uint32_t *pnum_param,
				   uint32_t *pparam_disp, uint8_t **pparam,
				   uint32_t *ptotal_data, uint32_t *pnum_data,
				   uint32_t *pdata_disp, uint8_t **pdata)
{
	uint32_t param_ofs, data_ofs;
	uint8_t expected_num_setup;
	uint32_t max_bytes = UINT32_MAX - bytes_ofs;
	uint32_t bytes_end;

	if (num_bytes > max_bytes) {
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}

	bytes_end = bytes_ofs + num_bytes;

	if (expect_first_reply) {
		if ((wct != 0) || (num_bytes != 0)) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		return NT_STATUS_OK;
	}

	switch (smb_cmd) {
	case SMBtrans:
	case SMBtrans2:
		if (wct < 10) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		expected_num_setup = wct - 10;
		*ptotal_param	= SVAL(vwv + 0, 0);
		*ptotal_data	= SVAL(vwv + 1, 0);
		*pnum_param	= SVAL(vwv + 3, 0);
		param_ofs	= SVAL(vwv + 4, 0);
		*pparam_disp	= SVAL(vwv + 5, 0);
		*pnum_data	= SVAL(vwv + 6, 0);
		data_ofs	= SVAL(vwv + 7, 0);
		*pdata_disp	= SVAL(vwv + 8, 0);
		*pnum_setup	= CVAL(vwv + 9, 0);
		if (expected_num_setup < (*pnum_setup)) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		*psetup = vwv + 10;

		break;
	case SMBnttrans:
		if (wct < 18) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		expected_num_setup = wct - 18;
		*ptotal_param	= IVAL(vwv, 3);
		*ptotal_data	= IVAL(vwv, 7);
		*pnum_param	= IVAL(vwv, 11);
		param_ofs	= IVAL(vwv, 15);
		*pparam_disp	= IVAL(vwv, 19);
		*pnum_data	= IVAL(vwv, 23);
		data_ofs	= IVAL(vwv, 27);
		*pdata_disp	= IVAL(vwv, 31);
		*pnum_setup	= CVAL(vwv, 35);
		if (expected_num_setup < (*pnum_setup)) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		*psetup		= vwv + 18;
		break;

	default:
		return NT_STATUS_INTERNAL_ERROR;
	}

	/*
	 * Check for buffer overflows. data_ofs needs to be checked against
	 * the incoming buffer length, data_disp against the total
	 * length. Likewise for param_ofs/param_disp.
	 */

	if (smb_buffer_oob(bytes_end, param_ofs, *pnum_param)
	    || smb_buffer_oob(*ptotal_param, *pparam_disp, *pnum_param)
	    || smb_buffer_oob(bytes_end, data_ofs, *pnum_data)
	    || smb_buffer_oob(*ptotal_data, *pdata_disp, *pnum_data)) {
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}

	*pparam = (uint8_t *)inhdr + param_ofs;
	*pdata = (uint8_t *)inhdr + data_ofs;

	return NT_STATUS_OK;
}

static NTSTATUS smb1cli_trans_pull_blob(TALLOC_CTX *mem_ctx,
					struct trans_recvblob *blob,
					uint32_t total, uint32_t thistime,
					uint8_t *buf, uint32_t displacement)
{
	if (blob->data == NULL) {
		if (total > blob->max) {
			return NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		blob->total = total;
		blob->data = talloc_array(mem_ctx, uint8_t, total);
		if (blob->data == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
	}

	if (total > blob->total) {
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}

	if (thistime) {
		memcpy(blob->data + displacement, buf, thistime);
		blob->received += thistime;
	}

	return NT_STATUS_OK;
}

static void smb1cli_trans_format(struct smb1cli_trans_state *state,
				 uint8_t *pwct,
				 int *piov_count)
{
	uint8_t wct = 0;
	struct iovec *iov = state->iov;
	uint8_t *pad = state->pad;
	uint16_t *vwv = state->vwv;
	uint32_t param_offset;
	uint32_t this_param = 0;
	uint32_t param_pad;
	uint32_t data_offset;
	uint32_t this_data = 0;
	uint32_t data_pad;
	uint32_t useable_space;
	uint8_t cmd;
	uint32_t max_trans = smb1cli_conn_max_xmit(state->conn);

	cmd = state->cmd;

	if ((state->param_sent != 0) || (state->data_sent != 0)) {
		/* The secondary commands are one after the primary ones */
		cmd += 1;
	}

	param_offset = MIN_SMB_SIZE;

	switch (cmd) {
	case SMBtrans:
		if (smbXcli_conn_use_unicode(state->conn)) {
			pad[0] = 0;
			iov[0].iov_base = (void *)pad;
			iov[0].iov_len = 1;
			param_offset += 1;
			iov += 1;
		}
		iov[0].iov_base = (void *)state->pipe_name_conv;
		iov[0].iov_len = state->pipe_name_conv_len;
		wct = 14 + state->num_setup;
		param_offset += iov[0].iov_len;
		iov += 1;
		break;
	case SMBtrans2:
		pad[0] = 0;
		pad[1] = 'D'; /* Copy this from "old" 3.0 behaviour */
		pad[2] = ' ';
		iov[0].iov_base = (void *)pad;
		iov[0].iov_len = 3;
		wct = 14 + state->num_setup;
		param_offset += 3;
		iov += 1;
		break;
	case SMBtranss:
		wct = 8;
		break;
	case SMBtranss2:
		wct = 9;
		break;
	case SMBnttrans:
		wct = 19 + state->num_setup;
		break;
	case SMBnttranss:
		wct = 18;
		break;
	}

	param_offset += wct * sizeof(uint16_t);
	useable_space = max_trans - param_offset;

	param_pad = param_offset % 4;
	if (param_pad > 0) {
		param_pad = MIN(param_pad, useable_space);
		iov[0].iov_base = (void *)state->zero_pad;
		iov[0].iov_len = param_pad;
		iov += 1;
		param_offset += param_pad;
	}
	useable_space = max_trans - param_offset;

	if (state->param_sent < state->num_param) {
		this_param = MIN(state->num_param - state->param_sent,
				 useable_space);
		iov[0].iov_base = (void *)(state->param + state->param_sent);
		iov[0].iov_len = this_param;
		iov += 1;
	}

	data_offset = param_offset + this_param;
	useable_space = max_trans - data_offset;

	data_pad = data_offset % 4;
	if (data_pad > 0) {
		data_pad = MIN(data_pad, useable_space);
		iov[0].iov_base = (void *)state->zero_pad;
		iov[0].iov_len = data_pad;
		iov += 1;
		data_offset += data_pad;
	}
	useable_space = max_trans - data_offset;

	if (state->data_sent < state->num_data) {
		this_data = MIN(state->num_data - state->data_sent,
				useable_space);
		iov[0].iov_base = (void *)(state->data + state->data_sent);
		iov[0].iov_len = this_data;
		iov += 1;
	}

	DEBUG(10, ("num_setup=%u, max_setup=%u, "
		   "param_total=%u, this_param=%u, max_param=%u, "
		   "data_total=%u, this_data=%u, max_data=%u, "
		   "param_offset=%u, param_pad=%u, param_disp=%u, "
		   "data_offset=%u, data_pad=%u, data_disp=%u\n",
		   (unsigned)state->num_setup, (unsigned)state->max_setup,
		   (unsigned)state->num_param, (unsigned)this_param,
		   (unsigned)state->rparam.max,
		   (unsigned)state->num_data, (unsigned)this_data,
		   (unsigned)state->rdata.max,
		   (unsigned)param_offset, (unsigned)param_pad,
		   (unsigned)state->param_sent,
		   (unsigned)data_offset, (unsigned)data_pad,
		   (unsigned)state->data_sent));

	switch (cmd) {
	case SMBtrans:
	case SMBtrans2:
		SSVAL(vwv + 0, 0, state->num_param);
		SSVAL(vwv + 1, 0, state->num_data);
		SSVAL(vwv + 2, 0, state->rparam.max);
		SSVAL(vwv + 3, 0, state->rdata.max);
		SCVAL(vwv + 4, 0, state->max_setup);
		SCVAL(vwv + 4, 1, 0);	/* reserved */
		SSVAL(vwv + 5, 0, state->flags);
		SIVAL(vwv + 6, 0, 0);	/* timeout */
		SSVAL(vwv + 8, 0, 0);	/* reserved */
		SSVAL(vwv + 9, 0, this_param);
		SSVAL(vwv +10, 0, param_offset);
		SSVAL(vwv +11, 0, this_data);
		SSVAL(vwv +12, 0, data_offset);
		SCVAL(vwv +13, 0, state->num_setup);
		SCVAL(vwv +13, 1, 0);	/* reserved */
		memcpy(vwv + 14, state->setup,
		       sizeof(uint16_t) * state->num_setup);
		break;
	case SMBtranss:
	case SMBtranss2:
		SSVAL(vwv + 0, 0, state->num_param);
		SSVAL(vwv + 1, 0, state->num_data);
		SSVAL(vwv + 2, 0, this_param);
		SSVAL(vwv + 3, 0, param_offset);
		SSVAL(vwv + 4, 0, state->param_sent);
		SSVAL(vwv + 5, 0, this_data);
		SSVAL(vwv + 6, 0, data_offset);
		SSVAL(vwv + 7, 0, state->data_sent);
		if (cmd == SMBtranss2) {
			SSVAL(vwv + 8, 0, state->fid);
		}
		break;
	case SMBnttrans:
		SCVAL(vwv + 0, 0, state->max_setup);
		SSVAL(vwv + 0, 1, 0); /* reserved */
		SIVAL(vwv + 1, 1, state->num_param);
		SIVAL(vwv + 3, 1, state->num_data);
		SIVAL(vwv + 5, 1, state->rparam.max);
		SIVAL(vwv + 7, 1, state->rdata.max);
		SIVAL(vwv + 9, 1, this_param);
		SIVAL(vwv +11, 1, param_offset);
		SIVAL(vwv +13, 1, this_data);
		SIVAL(vwv +15, 1, data_offset);
		SCVAL(vwv +17, 1, state->num_setup);
		SSVAL(vwv +18, 0, state->function);
		memcpy(vwv + 19, state->setup,
		       sizeof(uint16_t) * state->num_setup);
		break;
	case SMBnttranss:
		SSVAL(vwv + 0, 0, 0); /* reserved */
		SCVAL(vwv + 1, 0, 0); /* reserved */
		SIVAL(vwv + 1, 1, state->num_param);
		SIVAL(vwv + 3, 1, state->num_data);
		SIVAL(vwv + 5, 1, this_param);
		SIVAL(vwv + 7, 1, param_offset);
		SIVAL(vwv + 9, 1, state->param_sent);
		SIVAL(vwv +11, 1, this_data);
		SIVAL(vwv +13, 1, data_offset);
		SIVAL(vwv +15, 1, state->data_sent);
		SCVAL(vwv +17, 1, 0); /* reserved */
		break;
	}

	state->param_sent += this_param;
	state->data_sent += this_data;

	*pwct = wct;
	*piov_count = iov - state->iov;
}

static bool smb1cli_trans_cancel(struct tevent_req *req);
static void smb1cli_trans_done(struct tevent_req *subreq);

struct tevent_req *smb1cli_trans_send(
	TALLOC_CTX *mem_ctx, struct tevent_context *ev,
	struct smbXcli_conn *conn, uint8_t cmd,
	uint8_t additional_flags, uint8_t clear_flags,
	uint16_t additional_flags2, uint16_t clear_flags2,
	uint32_t timeout_msec,
	uint32_t pid,
	struct smbXcli_tcon *tcon,
	struct smbXcli_session *session,
	const char *pipe_name, uint16_t fid, uint16_t function, int flags,
	uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
	uint8_t *param, uint32_t num_param, uint32_t max_param,
	uint8_t *data, uint32_t num_data, uint32_t max_data)
{
	struct tevent_req *req, *subreq;
	struct smb1cli_trans_state *state;
	int iov_count;
	uint8_t wct;
	NTSTATUS status;
	charset_t charset;

	req = tevent_req_create(mem_ctx, &state,
				struct smb1cli_trans_state);
	if (req == NULL) {
		return NULL;
	}

	if ((cmd == SMBtrans) || (cmd == SMBtrans2)) {
		if ((num_param > 0xffff) || (max_param > 0xffff)
		    || (num_data > 0xffff) || (max_data > 0xffff)) {
			DEBUG(3, ("Attempt to send invalid trans2 request "
				  "(setup %u, params %u/%u, data %u/%u)\n",
				  (unsigned)num_setup,
				  (unsigned)num_param, (unsigned)max_param,
				  (unsigned)num_data, (unsigned)max_data));
			tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
			return tevent_req_post(req, ev);
		}
	}

	/*
	 * The largest wct will be for nttrans (19+num_setup). Make sure we
	 * don't overflow state->vwv in smb1cli_trans_format.
	 */

	if ((num_setup + 19) > ARRAY_SIZE(state->vwv)) {
		tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER_MIX);
		return tevent_req_post(req, ev);
	}

	state->conn = conn;
	state->ev = ev;
	state->cmd = cmd;
	state->additional_flags = additional_flags;
	state->clear_flags = clear_flags;
	state->additional_flags2 = additional_flags2;
	state->clear_flags2 = clear_flags2;
	state->timeout_msec = timeout_msec;
	state->flags = flags;
	state->num_rsetup = 0;
	state->rsetup = NULL;
	state->pid = pid;
	state->tcon = tcon;
	state->session = session;
	ZERO_STRUCT(state->rparam);
	ZERO_STRUCT(state->rdata);

	if (smbXcli_conn_use_unicode(conn)) {
		charset = CH_UTF16LE;
	} else {
		charset = CH_DOS;
	}

	if ((pipe_name != NULL)
	    && (!convert_string_talloc(state, CH_UNIX, charset,
				       pipe_name, strlen(pipe_name) + 1,
				       &state->pipe_name_conv,
				       &state->pipe_name_conv_len))) {
		tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
		return tevent_req_post(req, ev);
	}
	state->fid = fid;	/* trans2 */
	state->function = function; /* nttrans */

	state->setup = setup;
	state->num_setup = num_setup;
	state->max_setup = max_setup;

	state->param = param;
	state->num_param = num_param;
	state->param_sent = 0;
	state->rparam.max = max_param;

	state->data = data;
	state->num_data = num_data;
	state->data_sent = 0;
	state->rdata.max = max_data;

	smb1cli_trans_format(state, &wct, &iov_count);

	subreq = smb1cli_req_create(state, ev, conn, cmd,
				    state->additional_flags,
				    state->clear_flags,
				    state->additional_flags2,
				    state->clear_flags2,
				    state->timeout_msec,
				    state->pid,
				    state->tcon,
				    state->session,
				    wct, state->vwv,
				    iov_count, state->iov);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	status = smb1cli_req_chain_submit(&subreq, 1);
	if (tevent_req_nterror(req, status)) {
		return tevent_req_post(req, state->ev);
	}
	tevent_req_set_callback(subreq, smb1cli_trans_done, req);

	/*
	 * Now get the MID of the primary request
	 * and mark it as persistent. This means
	 * we will able to send and receive multiple
	 * SMB pdus using this MID in both directions
	 * (including correct SMB signing).
	 */
	state->mid = smb1cli_req_mid(subreq);
	smb1cli_req_set_mid(subreq, state->mid);
	state->primary_subreq = subreq;
	talloc_set_destructor(state, smb1cli_trans_state_destructor);

	tevent_req_set_cancel_fn(req, smb1cli_trans_cancel);

	return req;
}

static bool smb1cli_trans_cancel(struct tevent_req *req)
{
	struct smb1cli_trans_state *state =
		tevent_req_data(req,
		struct smb1cli_trans_state);

	if (state->primary_subreq == NULL) {
		return false;
	}

	return tevent_req_cancel(state->primary_subreq);
}

static void smb1cli_trans_done2(struct tevent_req *subreq);

static void smb1cli_trans_done(struct tevent_req *subreq)
{
	struct tevent_req *req =
		tevent_req_callback_data(subreq,
		struct tevent_req);
	struct smb1cli_trans_state *state =
		tevent_req_data(req,
		struct smb1cli_trans_state);
	NTSTATUS status;
	bool sent_all;
	struct iovec *recv_iov = NULL;
	uint8_t *inhdr;
	uint8_t wct;
	uint16_t *vwv;
	uint32_t vwv_ofs;
	uint32_t num_bytes;
	uint8_t *bytes;
	uint32_t bytes_ofs;
	uint8_t num_setup	= 0;
	uint16_t *setup		= NULL;
	uint32_t total_param	= 0;
	uint32_t num_param	= 0;
	uint32_t param_disp	= 0;
	uint32_t total_data	= 0;
	uint32_t num_data	= 0;
	uint32_t data_disp	= 0;
	uint8_t *param		= NULL;
	uint8_t *data		= NULL;

	status = smb1cli_req_recv(subreq, state,
				  &recv_iov,
				  &inhdr,
				  &wct,
				  &vwv,
				  &vwv_ofs,
				  &num_bytes,
				  &bytes,
				  &bytes_ofs,
				  NULL, /* pinbuf */
				  NULL, 0); /* expected */
	/*
	 * Do not TALLOC_FREE(subreq) here, we might receive more than
	 * one response for the same mid.
	 */

	/*
	 * We can receive something like STATUS_MORE_ENTRIES, so don't use
	 * !NT_STATUS_IS_OK(status) here.
	 */

	if (NT_STATUS_IS_ERR(status)) {
		goto fail;
	}

	if (recv_iov == NULL) {
		status = NT_STATUS_INVALID_NETWORK_RESPONSE;
		goto fail;
	}
	state->status = status;

	sent_all = ((state->param_sent == state->num_param)
		    && (state->data_sent == state->num_data));

	status = smb1cli_pull_trans(
		inhdr, wct, vwv, vwv_ofs,
		num_bytes, bytes, bytes_ofs,
		state->cmd, !sent_all, &num_setup, &setup,
		&total_param, &num_param, &param_disp, &param,
		&total_data, &num_data, &data_disp, &data);

	if (!NT_STATUS_IS_OK(status)) {
		goto fail;
	}

	if (!sent_all) {
		int iov_count;
		struct tevent_req *subreq2;

		smb1cli_trans_format(state, &wct, &iov_count);

		subreq2 = smb1cli_req_create(state, state->ev, state->conn,
					     state->cmd + 1,
					     state->additional_flags,
					     state->clear_flags,
					     state->additional_flags2,
					     state->clear_flags2,
					     state->timeout_msec,
					     state->pid,
					     state->tcon,
					     state->session,
					     wct, state->vwv,
					     iov_count, state->iov);
		if (tevent_req_nomem(subreq2, req)) {
			return;
		}
		smb1cli_req_set_mid(subreq2, state->mid);

		status = smb1cli_req_chain_submit(&subreq2, 1);

		if (!NT_STATUS_IS_OK(status)) {
			goto fail;
		}
		tevent_req_set_callback(subreq2, smb1cli_trans_done2, req);

		return;
	}

	status = smb1cli_trans_pull_blob(
		state, &state->rparam, total_param, num_param, param,
		param_disp);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("Pulling params failed: %s\n", nt_errstr(status)));
		goto fail;
	}

	status = smb1cli_trans_pull_blob(
		state, &state->rdata, total_data, num_data, data,
		data_disp);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("Pulling data failed: %s\n", nt_errstr(status)));
		goto fail;
	}

	if ((state->rparam.total == state->rparam.received)
	    && (state->rdata.total == state->rdata.received)) {
		state->recv_flags2 = SVAL(inhdr, HDR_FLG2);
		smb1cli_trans_cleanup_primary(state);
		tevent_req_done(req);
		return;
	}

	TALLOC_FREE(recv_iov);

	return;

 fail:
	smb1cli_trans_cleanup_primary(state);
	tevent_req_nterror(req, status);
}

static void smb1cli_trans_done2(struct tevent_req *subreq2)
{
	struct tevent_req *req =
		tevent_req_callback_data(subreq2,
		struct tevent_req);
	struct smb1cli_trans_state *state =
		tevent_req_data(req,
		struct smb1cli_trans_state);
	NTSTATUS status;
	bool sent_all;
	uint32_t seqnum;

	/*
	 * First backup the seqnum of the secondary request
	 * and attach it to the primary request.
	 */
	seqnum = smb1cli_req_seqnum(subreq2);
	smb1cli_req_set_seqnum(state->primary_subreq, seqnum);

	/* This was a one way request */
	status = smb1cli_req_recv(subreq2, state,
				  NULL, /* recv_iov */
				  NULL, /* phdr */
				  NULL, /* pwct */
				  NULL, /* pvwv */
				  NULL, /* pvwv_offset */
				  NULL, /* pnum_bytes */
				  NULL, /* pbytes */
				  NULL, /* pbytes_offset */
				  NULL, /* pinbuf */
				  NULL, 0); /* expected */
	TALLOC_FREE(subreq2);

	if (!NT_STATUS_IS_OK(status)) {
		goto fail;
	}

	sent_all = ((state->param_sent == state->num_param)
		    && (state->data_sent == state->num_data));

	if (!sent_all) {
		uint8_t wct;
		int iov_count;

		smb1cli_trans_format(state, &wct, &iov_count);

		subreq2 = smb1cli_req_create(state, state->ev, state->conn,
					     state->cmd + 1,
					     state->additional_flags,
					     state->clear_flags,
					     state->additional_flags2,
					     state->clear_flags2,
					     state->timeout_msec,
					     state->pid,
					     state->tcon,
					     state->session,
					     wct, state->vwv,
					     iov_count, state->iov);
		if (tevent_req_nomem(subreq2, req)) {
			return;
		}
		smb1cli_req_set_mid(subreq2, state->mid);

		status = smb1cli_req_chain_submit(&subreq2, 1);

		if (!NT_STATUS_IS_OK(status)) {
			goto fail;
		}
		tevent_req_set_callback(subreq2, smb1cli_trans_done2, req);
		return;
	}

	return;

 fail:
	smb1cli_trans_cleanup_primary(state);
	tevent_req_nterror(req, status);
}

NTSTATUS smb1cli_trans_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
			    uint16_t *recv_flags2,
			    uint16_t **setup, uint8_t min_setup,
			    uint8_t *num_setup,
			    uint8_t **param, uint32_t min_param,
			    uint32_t *num_param,
			    uint8_t **data, uint32_t min_data,
			    uint32_t *num_data)
{
	struct smb1cli_trans_state *state =
		tevent_req_data(req,
		struct smb1cli_trans_state);
	NTSTATUS status;

	smb1cli_trans_cleanup_primary(state);

	if (tevent_req_is_nterror(req, &status)) {
		if (!NT_STATUS_IS_ERR(status)) {
			status = NT_STATUS_INVALID_NETWORK_RESPONSE;
		}
		tevent_req_received(req);
		return status;
	}

	if ((state->num_rsetup < min_setup)
	    || (state->rparam.total < min_param)
	    || (state->rdata.total < min_data)) {
		tevent_req_received(req);
		return NT_STATUS_INVALID_NETWORK_RESPONSE;
	}

	if (recv_flags2 != NULL) {
		*recv_flags2 = state->recv_flags2;
	}

	if (setup != NULL) {
		*setup = talloc_move(mem_ctx, &state->rsetup);
		*num_setup = state->num_rsetup;
	} else {
		TALLOC_FREE(state->rsetup);
	}

	if (param != NULL) {
		*param = talloc_move(mem_ctx, &state->rparam.data);
		*num_param = state->rparam.total;
	} else {
		TALLOC_FREE(state->rparam.data);
	}

	if (data != NULL) {
		*data = talloc_move(mem_ctx, &state->rdata.data);
		*num_data = state->rdata.total;
	} else {
		TALLOC_FREE(state->rdata.data);
	}

	status = state->status;
	tevent_req_received(req);
	return status;
}

NTSTATUS smb1cli_trans(TALLOC_CTX *mem_ctx, struct smbXcli_conn *conn,
		uint8_t trans_cmd,
		uint8_t additional_flags, uint8_t clear_flags,
		uint16_t additional_flags2, uint16_t clear_flags2,
		uint32_t timeout_msec,
		uint32_t pid,
		struct smbXcli_tcon *tcon,
		struct smbXcli_session *session,
		const char *pipe_name, uint16_t fid, uint16_t function,
		int flags,
		uint16_t *setup, uint8_t num_setup, uint8_t max_setup,
		uint8_t *param, uint32_t num_param, uint32_t max_param,
		uint8_t *data, uint32_t num_data, uint32_t max_data,
		uint16_t *recv_flags2,
		uint16_t **rsetup, uint8_t min_rsetup, uint8_t *num_rsetup,
		uint8_t **rparam, uint32_t min_rparam, uint32_t *num_rparam,
		uint8_t **rdata, uint32_t min_rdata, uint32_t *num_rdata)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct tevent_context *ev;
	struct tevent_req *req;
	NTSTATUS status = NT_STATUS_OK;

	if (smbXcli_conn_has_async_calls(conn)) {
		/*
		 * Can't use sync call while an async call is in flight
		 */
		status = NT_STATUS_INVALID_PARAMETER_MIX;
		goto fail;
	}

	ev = tevent_context_init(frame);
	if (ev == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	req = smb1cli_trans_send(frame, ev, conn, trans_cmd,
				 additional_flags, clear_flags,
				 additional_flags2, clear_flags2,
				 timeout_msec,
				 pid, tcon, session,
				 pipe_name, fid, function, flags,
				 setup, num_setup, max_setup,
				 param, num_param, max_param,
				 data, num_data, max_data);
	if (req == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	if (!tevent_req_poll(req, ev)) {
		status = map_nt_error_from_unix_common(errno);
		goto fail;
	}

	status = smb1cli_trans_recv(req, mem_ctx, recv_flags2,
				    rsetup, min_rsetup, num_rsetup,
				    rparam, min_rparam, num_rparam,
				    rdata, min_rdata, num_rdata);
 fail:
	TALLOC_FREE(frame);
	return status;
}