summaryrefslogtreecommitdiff
path: root/source3/libsmb/clientgen.c
blob: 45addc21632874daa2a630b5d1e389d49a394f4f (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
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
/* 
   Unix SMB/CIFS implementation.
   SMB client generic functions
   Copyright (C) Andrew Tridgell 1994-1998
   Copyright (C) Jeremy Allison 2007.
   
   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"

/*******************************************************************
 Setup the word count and byte count for a client smb message.
********************************************************************/

int cli_set_message(char *buf,int num_words,int num_bytes,bool zero)
{
	if (zero && (num_words || num_bytes)) {
		memset(buf + smb_size,'\0',num_words*2 + num_bytes);
	}
	SCVAL(buf,smb_wct,num_words);
	SSVAL(buf,smb_vwv + num_words*SIZEOFWORD,num_bytes);
	smb_setlen(buf,smb_size + num_words*2 + num_bytes - 4);
	return (smb_size + num_words*2 + num_bytes);
}

/****************************************************************************
 Change the timeout (in milliseconds).
****************************************************************************/

unsigned int cli_set_timeout(struct cli_state *cli, unsigned int timeout)
{
	unsigned int old_timeout = cli->timeout;
	cli->timeout = timeout;
	return old_timeout;
}

/****************************************************************************
 Change the port number used to call on.
****************************************************************************/

void cli_set_port(struct cli_state *cli, int port)
{
	cli->port = port;
}

/****************************************************************************
 convenience routine to find if we negotiated ucs2
****************************************************************************/

bool cli_ucs2(struct cli_state *cli)
{
	return ((cli->capabilities & CAP_UNICODE) != 0);
}


/****************************************************************************
 Read an smb from a fd ignoring all keepalive packets.
 The timeout is in milliseconds

 This is exactly the same as receive_smb except that it never returns
 a session keepalive packet (just as receive_smb used to do).
 receive_smb was changed to return keepalives as the oplock processing means this call
 should never go into a blocking read.
****************************************************************************/

static ssize_t client_receive_smb(struct cli_state *cli, size_t maxlen)
{
	size_t len;

	for(;;) {
		NTSTATUS status;

		set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);

		status = receive_smb_raw(cli->fd, cli->inbuf, cli->bufsize,
					cli->timeout, maxlen, &len);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(10,("client_receive_smb failed\n"));
			show_msg(cli->inbuf);

			if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
				set_smb_read_error(&cli->smb_rw_error,
						   SMB_READ_EOF);
				return -1;
			}

			if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
				set_smb_read_error(&cli->smb_rw_error,
						   SMB_READ_TIMEOUT);
				return -1;
			}

			set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
			return -1;
		}

		/*
		 * I don't believe len can be < 0 with NT_STATUS_OK
		 * returned above, but this check doesn't hurt. JRA.
		 */

		if ((ssize_t)len < 0) {
			return len;
		}

		/* Ignore session keepalive packets. */
		if(CVAL(cli->inbuf,0) != SMBkeepalive) {
			break;
		}
	}

	if (cli_encryption_on(cli)) {
		NTSTATUS status = cli_decrypt_message(cli);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(0, ("SMB decryption failed on incoming packet! Error %s\n",
				nt_errstr(status)));
			cli->smb_rw_error = SMB_READ_BAD_DECRYPT;
			return -1;
		}
	}

	show_msg(cli->inbuf);
	return len;
}

static bool cli_state_set_seqnum(struct cli_state *cli, uint16_t mid, uint32_t seqnum)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			c->seqnum = seqnum;
			return true;
		}
	}

	c = talloc_zero(cli, struct cli_state_seqnum);
	if (!c) {
		return false;
	}

	c->mid = mid;
	c->seqnum = seqnum;
	c->persistent = false;
	DLIST_ADD_END(cli->seqnum, c, struct cli_state_seqnum *);

	return true;
}

bool cli_state_seqnum_persistent(struct cli_state *cli,
				 uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			c->persistent = true;
			return true;
		}
	}

	return false;
}

bool cli_state_seqnum_remove(struct cli_state *cli,
			     uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			DLIST_REMOVE(cli->seqnum, c);
			TALLOC_FREE(c);
			return true;
		}
	}

	return false;
}

static uint32_t cli_state_get_seqnum(struct cli_state *cli, uint16_t mid)
{
	struct cli_state_seqnum *c;

	for (c = cli->seqnum; c; c = c->next) {
		if (c->mid == mid) {
			uint32_t seqnum = c->seqnum;
			if (!c->persistent) {
				DLIST_REMOVE(cli->seqnum, c);
				TALLOC_FREE(c);
			}
			return seqnum;
		}
	}

	return 0;
}

/****************************************************************************
 Recv an smb.
****************************************************************************/

bool cli_receive_smb(struct cli_state *cli)
{
	ssize_t len;
	uint16_t mid;
	uint32_t seqnum;

	/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
	if (cli->fd == -1)
		return false; 

 again:
	len = client_receive_smb(cli, 0);
	
	if (len > 0) {
		/* it might be an oplock break request */
		if (!(CVAL(cli->inbuf, smb_flg) & FLAG_REPLY) &&
		    CVAL(cli->inbuf,smb_com) == SMBlockingX &&
		    SVAL(cli->inbuf,smb_vwv6) == 0 &&
		    SVAL(cli->inbuf,smb_vwv7) == 0) {
			if (cli->oplock_handler) {
				int fnum = SVAL(cli->inbuf,smb_vwv2);
				unsigned char level = CVAL(cli->inbuf,smb_vwv3+1);
				if (!cli->oplock_handler(cli, fnum, level)) {
					return false;
				}
			}
			/* try to prevent loops */
			SCVAL(cli->inbuf,smb_com,0xFF);
			goto again;
		}
	}

	/* If the server is not responding, note that now */
	if (len < 0) {
                DEBUG(0, ("Receiving SMB: Server stopped responding\n"));
		close(cli->fd);
		cli->fd = -1;
		return false;
	}

	mid = SVAL(cli->inbuf,smb_mid);
	seqnum = cli_state_get_seqnum(cli, mid);

	if (!cli_check_sign_mac(cli, cli->inbuf, seqnum+1)) {
		/*
		 * If we get a signature failure in sessionsetup, then
		 * the server sometimes just reflects the sent signature
		 * back to us. Detect this and allow the upper layer to
		 * retrieve the correct Windows error message.
		 */
		if (CVAL(cli->outbuf,smb_com) == SMBsesssetupX &&
			(smb_len(cli->inbuf) > (smb_ss_field + 8 - 4)) &&
			(SVAL(cli->inbuf,smb_flg2) & FLAGS2_SMB_SECURITY_SIGNATURES) &&
			memcmp(&cli->outbuf[smb_ss_field],&cli->inbuf[smb_ss_field],8) == 0 &&
			cli_is_error(cli)) {

			/*
			 * Reflected signature on login error. 
			 * Set bad sig but don't close fd.
			 */
			cli->smb_rw_error = SMB_READ_BAD_SIG;
			return true;
		}

		DEBUG(0, ("SMB Signature verification failed on incoming packet!\n"));
		cli->smb_rw_error = SMB_READ_BAD_SIG;
		close(cli->fd);
		cli->fd = -1;
		return false;
	};
	return true;
}

/****************************************************************************
 Read the data portion of a readX smb.
 The timeout is in milliseconds
****************************************************************************/

ssize_t cli_receive_smb_data(struct cli_state *cli, char *buffer, size_t len)
{
	NTSTATUS status;

	set_smb_read_error(&cli->smb_rw_error, SMB_READ_OK);

	status = read_socket_with_timeout(
		cli->fd, buffer, len, len, cli->timeout, NULL);
	if (NT_STATUS_IS_OK(status)) {
		return len;
	}

	if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
		set_smb_read_error(&cli->smb_rw_error, SMB_READ_EOF);
		return -1;
	}

	if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
		set_smb_read_error(&cli->smb_rw_error, SMB_READ_TIMEOUT);
		return -1;
	}

	set_smb_read_error(&cli->smb_rw_error, SMB_READ_ERROR);
	return -1;
}

static ssize_t write_socket(int fd, const char *buf, size_t len)
{
        ssize_t ret=0;

        DEBUG(6,("write_socket(%d,%d)\n",fd,(int)len));
        ret = write_data(fd,buf,len);

        DEBUG(6,("write_socket(%d,%d) wrote %d\n",fd,(int)len,(int)ret));
        if(ret <= 0)
                DEBUG(0,("write_socket: Error writing %d bytes to socket %d: ERRNO = %s\n",
                        (int)len, fd, strerror(errno) ));

        return(ret);
}

/****************************************************************************
 Send an smb to a fd.
****************************************************************************/

bool cli_send_smb(struct cli_state *cli)
{
	size_t len;
	size_t nwritten=0;
	ssize_t ret;
	char *buf_out = cli->outbuf;
	bool enc_on = cli_encryption_on(cli);
	uint32_t seqnum;

	/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
	if (cli->fd == -1)
		return false;

	cli_calculate_sign_mac(cli, cli->outbuf, &seqnum);

	if (!cli_state_set_seqnum(cli, cli->mid, seqnum)) {
		DEBUG(0,("Failed to store mid[%u]/seqnum[%u]\n",
			(unsigned int)cli->mid,
			(unsigned int)seqnum));
		return false;
	}

	if (enc_on) {
		NTSTATUS status = cli_encrypt_message(cli, cli->outbuf,
						      &buf_out);
		if (!NT_STATUS_IS_OK(status)) {
			close(cli->fd);
			cli->fd = -1;
			cli->smb_rw_error = SMB_WRITE_ERROR;
			DEBUG(0,("Error in encrypting client message. Error %s\n",
				nt_errstr(status) ));
			return false;
		}
	}

	len = smb_len(buf_out) + 4;

	while (nwritten < len) {
		ret = write_socket(cli->fd,buf_out+nwritten,len - nwritten);
		if (ret <= 0) {
			if (enc_on) {
				cli_free_enc_buffer(cli, buf_out);
			}
			close(cli->fd);
			cli->fd = -1;
			cli->smb_rw_error = SMB_WRITE_ERROR;
			DEBUG(0,("Error writing %d bytes to client. %d (%s)\n",
				(int)len,(int)ret, strerror(errno) ));
			return false;
		}
		nwritten += ret;
	}

	if (enc_on) {
		cli_free_enc_buffer(cli, buf_out);
	}

	/* Increment the mid so we can tell between responses. */
	cli->mid++;
	if (!cli->mid)
		cli->mid++;
	return true;
}

/****************************************************************************
 Send a "direct" writeX smb to a fd.
****************************************************************************/

bool cli_send_smb_direct_writeX(struct cli_state *cli,
				const char *p,
				size_t extradata)
{
	/* First length to send is the offset to the data. */
	size_t len = SVAL(cli->outbuf,smb_vwv11) + 4;
	size_t nwritten=0;
	struct iovec iov[2];

	/* fd == -1 causes segfaults -- Tom (tom@ninja.nl) */
	if (cli->fd == -1) {
		return false;
	}

	if (client_is_signing_on(cli)) {
		DEBUG(0,("cli_send_smb_large: cannot send signed packet.\n"));
		return false;
	}

	iov[0].iov_base = cli->outbuf;
	iov[0].iov_len = len;
	iov[1].iov_base = CONST_DISCARD(char *, p);
	iov[1].iov_len = extradata;

	nwritten = write_data_iov(cli->fd, iov, 2);
	if (nwritten < (len + extradata)) {
		close(cli->fd);
		cli->fd = -1;
		cli->smb_rw_error = SMB_WRITE_ERROR;
		DEBUG(0,("Error writing %d bytes to client. (%s)\n",
			 (int)(len+extradata), strerror(errno)));
		return false;
	}

	/* Increment the mid so we can tell between responses. */
	cli->mid++;
	if (!cli->mid)
		cli->mid++;
	return true;
}

/****************************************************************************
 Setup basics in a outgoing packet.
****************************************************************************/

void cli_setup_packet_buf(struct cli_state *cli, char *buf)
{
	uint16 flags2;
	cli->rap_error = 0;
	SIVAL(buf,smb_rcls,0);
	SSVAL(buf,smb_pid,cli->pid);
	memset(buf+smb_pidhigh, 0, 12);
	SSVAL(buf,smb_uid,cli->vuid);
	SSVAL(buf,smb_mid,cli->mid);

	if (cli->protocol <= PROTOCOL_CORE) {
		return;
	}

	if (cli->case_sensitive) {
		SCVAL(buf,smb_flg,0x0);
	} else {
		/* Default setting, case insensitive. */
		SCVAL(buf,smb_flg,0x8);
	}
	flags2 = FLAGS2_LONG_PATH_COMPONENTS;
	if (cli->capabilities & CAP_UNICODE)
		flags2 |= FLAGS2_UNICODE_STRINGS;
	if ((cli->capabilities & CAP_DFS) && cli->dfsroot)
		flags2 |= FLAGS2_DFS_PATHNAMES;
	if (cli->capabilities & CAP_STATUS32)
		flags2 |= FLAGS2_32_BIT_ERROR_CODES;
	if (cli->use_spnego)
		flags2 |= FLAGS2_EXTENDED_SECURITY;
	SSVAL(buf,smb_flg2, flags2);
}

void cli_setup_packet(struct cli_state *cli)
{
	cli_setup_packet_buf(cli, cli->outbuf);
}

/****************************************************************************
 Setup the bcc length of the packet from a pointer to the end of the data.
****************************************************************************/

void cli_setup_bcc(struct cli_state *cli, void *p)
{
	set_message_bcc(cli->outbuf, PTR_DIFF(p, smb_buf(cli->outbuf)));
}

/****************************************************************************
 Initialize Domain, user or password.
****************************************************************************/

NTSTATUS cli_set_domain(struct cli_state *cli, const char *domain)
{
	TALLOC_FREE(cli->domain);
	cli->domain = talloc_strdup(cli, domain ? domain : "");
	if (cli->domain == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

NTSTATUS cli_set_username(struct cli_state *cli, const char *username)
{
	TALLOC_FREE(cli->user_name);
	cli->user_name = talloc_strdup(cli, username ? username : "");
	if (cli->user_name == NULL) {
		return NT_STATUS_NO_MEMORY;
	}
	return NT_STATUS_OK;
}

NTSTATUS cli_set_password(struct cli_state *cli, const char *password)
{
	TALLOC_FREE(cli->password);

	/* Password can be NULL. */
	if (password) {
		cli->password = talloc_strdup(cli, password);
		if (cli->password == NULL) {
			return NT_STATUS_NO_MEMORY;
		}
	} else {
		/* Use zero NTLMSSP hashes and session key. */
		cli->password = NULL;
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Initialise credentials of a client structure.
****************************************************************************/

NTSTATUS cli_init_creds(struct cli_state *cli, const char *username, const char *domain, const char *password)
{
	NTSTATUS status = cli_set_username(cli, username);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	status = cli_set_domain(cli, domain);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}
	DEBUG(10,("cli_init_creds: user %s domain %s\n", cli->user_name, cli->domain));

	return cli_set_password(cli, password);
}

/****************************************************************************
 Initialise a client structure. Always returns a talloc'ed struct.
 Set the signing state (used from the command line).
****************************************************************************/

struct cli_state *cli_initialise_ex(int signing_state)
{
	struct cli_state *cli = NULL;
	bool allow_smb_signing = false;
	bool mandatory_signing = false;

	/* Check the effective uid - make sure we are not setuid */
	if (is_setuid_root()) {
		DEBUG(0,("libsmb based programs must *NOT* be setuid root.\n"));
		return NULL;
	}

	cli = TALLOC_ZERO_P(NULL, struct cli_state);
	if (!cli) {
		return NULL;
	}

	cli->dfs_mountpoint = talloc_strdup(cli, "");
	if (!cli->dfs_mountpoint) {
		goto error;
	}
	cli->port = 0;
	cli->fd = -1;
	cli->cnum = -1;
	cli->pid = (uint16)sys_getpid();
	cli->mid = 1;
	cli->vuid = UID_FIELD_INVALID;
	cli->protocol = PROTOCOL_NT1;
	cli->timeout = 20000; /* Timeout is in milliseconds. */
	cli->bufsize = CLI_BUFFER_SIZE+4;
	cli->max_xmit = cli->bufsize;
	cli->outbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
	cli->seqnum = 0;
	cli->inbuf = (char *)SMB_MALLOC(cli->bufsize+SAFETY_MARGIN);
	cli->oplock_handler = cli_oplock_ack;
	cli->case_sensitive = false;
	cli->smb_rw_error = SMB_READ_OK;

	cli->use_spnego = lp_client_use_spnego();

	cli->capabilities = CAP_UNICODE | CAP_STATUS32 | CAP_DFS;

	/* Set the CLI_FORCE_DOSERR environment variable to test
	   client routines using DOS errors instead of STATUS32
	   ones.  This intended only as a temporary hack. */	
	if (getenv("CLI_FORCE_DOSERR"))
		cli->force_dos_errors = true;

	if (lp_client_signing()) {
		allow_smb_signing = true;
	}

	if (lp_client_signing() == Required) {
		mandatory_signing = true;
	}

	if (signing_state != Undefined) {
		allow_smb_signing = true;
	}

	if (signing_state == false) {
		allow_smb_signing = false;
		mandatory_signing = false;
	}

	if (signing_state == Required) {
		mandatory_signing = true;
	}

	if (!cli->outbuf || !cli->inbuf)
                goto error;

	memset(cli->outbuf, 0, cli->bufsize);
	memset(cli->inbuf, 0, cli->bufsize);


#if defined(DEVELOPER)
	/* just because we over-allocate, doesn't mean it's right to use it */
	clobber_region(FUNCTION_MACRO, __LINE__, cli->outbuf+cli->bufsize, SAFETY_MARGIN);
	clobber_region(FUNCTION_MACRO, __LINE__, cli->inbuf+cli->bufsize, SAFETY_MARGIN);
#endif

	/* initialise signing */
	cli->signing_state = smb_signing_init(cli,
					      allow_smb_signing,
					      mandatory_signing);
	if (!cli->signing_state) {
		goto error;
	}

	cli->outgoing = tevent_queue_create(cli, "cli_outgoing");
	if (cli->outgoing == NULL) {
		goto error;
	}
	cli->pending = NULL;

	cli->initialised = 1;

	return cli;

        /* Clean up after malloc() error */

 error:

        SAFE_FREE(cli->inbuf);
        SAFE_FREE(cli->outbuf);
	TALLOC_FREE(cli);
        return NULL;
}

struct cli_state *cli_initialise(void)
{
	return cli_initialise_ex(Undefined);
}

/****************************************************************************
 Close all pipes open on this session.
****************************************************************************/

void cli_nt_pipes_close(struct cli_state *cli)
{
	while (cli->pipe_list != NULL) {
		/*
		 * No TALLOC_FREE here!
		 */
		talloc_free(cli->pipe_list);
	}
}

/****************************************************************************
 Shutdown a client structure.
****************************************************************************/

void cli_shutdown(struct cli_state *cli)
{
	if (cli->prev == NULL) {
		/*
		 * Possible head of a DFS list,
		 * shutdown all subsidiary DFS
		 * connections.
		 */
		struct cli_state *p, *next;

		for (p = cli->next; p; p = next) {
			next = p->next;
			cli_shutdown(p);
		}
	} else {
		/*
		 * We're a subsidiary connection.
		 * Just remove ourselves from the
		 * DFS list.
		 */
		DLIST_REMOVE(cli->prev, cli);
	}

	cli_nt_pipes_close(cli);

	/*
	 * tell our peer to free his resources.  Wihtout this, when an
	 * application attempts to do a graceful shutdown and calls
	 * smbc_free_context() to clean up all connections, some connections
	 * can remain active on the peer end, until some (long) timeout period
	 * later.  This tree disconnect forces the peer to clean up, since the
	 * connection will be going away.
	 *
	 * Also, do not do tree disconnect when cli->smb_rw_error is SMB_DO_NOT_DO_TDIS
	 * the only user for this so far is smbmount which passes opened connection
	 * down to kernel's smbfs module.
	 */
	if ( (cli->cnum != (uint16)-1) && (cli->smb_rw_error != SMB_DO_NOT_DO_TDIS ) ) {
		cli_tdis(cli);
	}
        
	SAFE_FREE(cli->outbuf);
	SAFE_FREE(cli->inbuf);

	data_blob_free(&cli->secblob);
	data_blob_free(&cli->user_session_key);

	if (cli->fd != -1) {
		close(cli->fd);
	}
	cli->fd = -1;
	cli->smb_rw_error = SMB_READ_OK;

	/*
	 * Need to free pending first, they remove themselves
	 */
	while (cli->pending) {
		talloc_free(cli->pending[0]);
	}
	TALLOC_FREE(cli);
}

/****************************************************************************
 Set socket options on a open connection.
****************************************************************************/

void cli_sockopt(struct cli_state *cli, const char *options)
{
	set_socket_options(cli->fd, options);
}

/****************************************************************************
 Set the PID to use for smb messages. Return the old pid.
****************************************************************************/

uint16 cli_setpid(struct cli_state *cli, uint16 pid)
{
	uint16 ret = cli->pid;
	cli->pid = pid;
	return ret;
}

/****************************************************************************
 Set the case sensitivity flag on the packets. Returns old state.
****************************************************************************/

bool cli_set_case_sensitive(struct cli_state *cli, bool case_sensitive)
{
	bool ret = cli->case_sensitive;
	cli->case_sensitive = case_sensitive;
	return ret;
}

/****************************************************************************
Send a keepalive packet to the server
****************************************************************************/

bool cli_send_keepalive(struct cli_state *cli)
{
        if (cli->fd == -1) {
                DEBUG(3, ("cli_send_keepalive: fd == -1\n"));
                return false;
        }
        if (!send_keepalive(cli->fd)) {
                close(cli->fd);
                cli->fd = -1;
                DEBUG(0,("Error sending keepalive packet to client.\n"));
                return false;
        }
        return true;
}

struct cli_echo_state {
	uint16_t vwv[1];
	DATA_BLOB data;
	int num_echos;
};

static void cli_echo_done(struct tevent_req *subreq);

struct tevent_req *cli_echo_send(TALLOC_CTX *mem_ctx, struct event_context *ev,
				 struct cli_state *cli, uint16_t num_echos,
				 DATA_BLOB data)
{
	struct tevent_req *req, *subreq;
	struct cli_echo_state *state;

	req = tevent_req_create(mem_ctx, &state, struct cli_echo_state);
	if (req == NULL) {
		return NULL;
	}
	SSVAL(state->vwv, 0, num_echos);
	state->data = data;
	state->num_echos = num_echos;

	subreq = cli_smb_send(state, ev, cli, SMBecho, 0, 1, state->vwv,
			      data.length, data.data);
	if (subreq == NULL) {
		goto fail;
	}
	tevent_req_set_callback(subreq, cli_echo_done, req);
	return req;
 fail:
	TALLOC_FREE(req);
	return NULL;
}

static void cli_echo_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct cli_echo_state *state = tevent_req_data(
		req, struct cli_echo_state);
	NTSTATUS status;
	uint32_t num_bytes;
	uint8_t *bytes;

	status = cli_smb_recv(subreq, 0, NULL, NULL, &num_bytes, &bytes);
	if (!NT_STATUS_IS_OK(status)) {
		tevent_req_nterror(req, status);
		return;
	}
	if ((num_bytes != state->data.length)
	    || (memcmp(bytes, state->data.data, num_bytes) != 0)) {
		tevent_req_nterror(req, NT_STATUS_INVALID_NETWORK_RESPONSE);
		return;
	}

	state->num_echos -=1;
	if (state->num_echos == 0) {
		tevent_req_done(req);
		return;
	}

	if (!cli_smb_req_set_pending(subreq)) {
		tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
		return;
	}
}

/**
 * Get the result out from an echo request
 * @param[in] req	The async_req from cli_echo_send
 * @retval Did the server reply correctly?
 */

NTSTATUS cli_echo_recv(struct tevent_req *req)
{
	return tevent_req_simple_recv_ntstatus(req);
}

/**
 * @brief Send/Receive SMBEcho requests
 * @param[in] mem_ctx	The memory context to put the async_req on
 * @param[in] ev	The event context that will call us back
 * @param[in] cli	The connection to send the echo to
 * @param[in] num_echos	How many times do we want to get the reply?
 * @param[in] data	The data we want to get back
 * @retval Did the server reply correctly?
 */

NTSTATUS cli_echo(struct cli_state *cli, uint16_t num_echos, DATA_BLOB data)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct event_context *ev;
	struct tevent_req *req;
	NTSTATUS status = NT_STATUS_OK;

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

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

	req = cli_echo_send(frame, ev, cli, num_echos, data);
	if (req == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

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

	status = cli_echo_recv(req);
 fail:
	TALLOC_FREE(frame);
	if (!NT_STATUS_IS_OK(status)) {
		cli_set_error(cli, status);
	}
	return status;
}

/**
 * Is the SMB command able to hold an AND_X successor
 * @param[in] cmd	The SMB command in question
 * @retval Can we add a chained request after "cmd"?
 */
bool is_andx_req(uint8_t cmd)
{
	switch (cmd) {
	case SMBtconX:
	case SMBlockingX:
	case SMBopenX:
	case SMBreadX:
	case SMBwriteX:
	case SMBsesssetupX:
	case SMBulogoffX:
	case SMBntcreateX:
		return true;
		break;
	default:
		break;
	}

	return false;
}