summaryrefslogtreecommitdiff
path: root/source4/smb_server/smb_server.c
blob: e6201c077e1789aed8e6ee67978a9325c9b900fd (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
/* 
   Unix SMB/CIFS implementation.
   process incoming packets - main loop
   Copyright (C) Andrew Tridgell 1992-2003
   Copyright (C) James J Myers 2003 <myersjj@samba.org>
   Copyright (C) Stefan Metzmacher 2004
   
   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 "includes.h"
#include "events.h"
#include "system/time.h"
#include "dlinklist.h"
#include "smb_server/smb_server.h"


/*
  send an oplock break request to a client
*/
BOOL req_send_oplock_break(struct smbsrv_tcon *tcon, uint16_t fnum, uint8_t level)
{
	struct smbsrv_request *req;

	req = init_smb_request(tcon->smb_conn);

	req_setup_reply(req, 8, 0);
	
	SCVAL(req->out.hdr,HDR_COM,SMBlockingX);
	SSVAL(req->out.hdr,HDR_TID,tcon->cnum);
	SSVAL(req->out.hdr,HDR_PID,0xFFFF);
	SSVAL(req->out.hdr,HDR_UID,0);
	SSVAL(req->out.hdr,HDR_MID,0xFFFF);
	SCVAL(req->out.hdr,HDR_FLG,0);
	SSVAL(req->out.hdr,HDR_FLG2,0);

	SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
	SSVAL(req->out.vwv, VWV(1), 0);
	SSVAL(req->out.vwv, VWV(2), fnum);
	SCVAL(req->out.vwv, VWV(3), LOCKING_ANDX_OPLOCK_RELEASE);
	SCVAL(req->out.vwv, VWV(3)+1, level);
	SIVAL(req->out.vwv, VWV(4), 0);
	SSVAL(req->out.vwv, VWV(6), 0);
	SSVAL(req->out.vwv, VWV(7), 0);

	req_send_reply(req);
	return True;
}


static void construct_reply(struct smbsrv_request *req);

/****************************************************************************
receive a SMB request header from the wire, forming a request_context
from the result
****************************************************************************/
static NTSTATUS receive_smb_request(struct smbsrv_connection *smb_conn, struct timeval t)
{
	NTSTATUS status;
	ssize_t len;
	struct smbsrv_request *req;
	size_t nread;

	/* allocate the request if needed */
	if (smb_conn->partial_req == NULL) {
		req = init_smb_request(smb_conn);
		if (req == NULL) {
			return NT_STATUS_NO_MEMORY;
		}

		req->in.buffer = talloc_array_p(req, uint8_t, NBT_HDR_SIZE);
		if (req->in.buffer == NULL) {
			talloc_free(req);
			return NT_STATUS_NO_MEMORY;
		}
		req->in.size = 0;
		smb_conn->partial_req = req;
	}

	req = smb_conn->partial_req;

	/* read in the header */
	if (req->in.size < NBT_HDR_SIZE) {
		status = socket_recv(smb_conn->connection->socket, 
				     req->in.buffer + req->in.size,
				     NBT_HDR_SIZE - req->in.size, 
				     &nread, 0);
		if (NT_STATUS_IS_ERR(status)) {
			return status;
		}
		if (nread == 0) {
			return NT_STATUS_OK;
		}
		req->in.size += nread;

		/* when we have a full NBT header, then allocate the packet */
		if (req->in.size == NBT_HDR_SIZE) {
			len = smb_len(req->in.buffer) + NBT_HDR_SIZE;
			req->in.buffer = talloc_realloc(req, req->in.buffer, 
							uint8_t, len);
			if (req->in.buffer == NULL) {
				return NT_STATUS_NO_MEMORY;
			}
		} else {
			return NT_STATUS_OK;
		}
	}

	/* read in the main packet */
	len = smb_len(req->in.buffer) + NBT_HDR_SIZE;

	status = socket_recv(smb_conn->connection->socket, 
			     req->in.buffer + req->in.size,
			     len - req->in.size, 
			     &nread, 0);
	if (NT_STATUS_IS_ERR(status)) {
		return status;
	}
	if (nread == 0) {
		return NT_STATUS_OK;
	}

	req->in.size += nread;

	if (req->in.size != len) {
		return NT_STATUS_OK;
	}

	/* we have a full packet */
	req->request_time = t;
	req->chained_fnum = -1;
	req->in.allocated = req->in.size;
	req->in.hdr = req->in.buffer + NBT_HDR_SIZE;
	req->in.vwv = req->in.hdr + HDR_VWV;
	req->in.wct = CVAL(req->in.hdr, HDR_WCT);
	if (req->in.vwv + VWV(req->in.wct) <= req->in.buffer + req->in.size) {
		req->in.data = req->in.vwv + VWV(req->in.wct) + 2;
		req->in.data_size = SVAL(req->in.vwv, VWV(req->in.wct));

		/* the bcc length is only 16 bits, but some packets
		   (such as SMBwriteX) can be much larger than 64k. We
		   detect this by looking for a large non-chained NBT
		   packet (at least 64k bigger than what is
		   specified). If it is detected then the NBT size is
		   used instead of the bcc size */
		if (req->in.data_size + 0x10000 <= 
		    req->in.size - PTR_DIFF(req->in.data, req->in.buffer) &&
		    (req->in.wct < 1 || SVAL(req->in.vwv, VWV(0)) == SMB_CHAIN_NONE)) {
			/* its an oversized packet! fun for all the family */
			req->in.data_size = req->in.size - PTR_DIFF(req->in.data,req->in.buffer);
		}
	}

	smb_conn->partial_req = NULL;

	construct_reply(req);

	return NT_STATUS_OK;
}

/*
  These flags determine some of the permissions required to do an operation 
*/
#define AS_USER (1<<0)

/* 
   define a list of possible SMB messages and their corresponding
   functions. Any message that has a NULL function is unimplemented -
   please feel free to contribute implementations!
*/
static const struct smb_message_struct
{
	const char *name;
	void (*fn)(struct smbsrv_request *);
	int flags;
}
 smb_messages[256] = {
/* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER},
/* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER},
/* 0x02 */ { "SMBopen",reply_open,AS_USER},
/* 0x03 */ { "SMBcreate",reply_mknew,AS_USER},
/* 0x04 */ { "SMBclose",reply_close,AS_USER},
/* 0x05 */ { "SMBflush",reply_flush,AS_USER},
/* 0x06 */ { "SMBunlink",reply_unlink,AS_USER},
/* 0x07 */ { "SMBmv",reply_mv,AS_USER},
/* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER},
/* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER},
/* 0x0a */ { "SMBread",reply_read,AS_USER},
/* 0x0b */ { "SMBwrite",reply_write,AS_USER},
/* 0x0c */ { "SMBlock",reply_lock,AS_USER},
/* 0x0d */ { "SMBunlock",reply_unlock,AS_USER},
/* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER },
/* 0x0f */ { "SMBmknew",reply_mknew,AS_USER}, 
/* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER},
/* 0x11 */ { "SMBexit",reply_exit,0},
/* 0x12 */ { "SMBlseek",reply_lseek,AS_USER},
/* 0x13 */ { "SMBlockread",reply_lockread,AS_USER},
/* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER},
/* 0x15 */ { NULL, NULL, 0 },
/* 0x16 */ { NULL, NULL, 0 },
/* 0x17 */ { NULL, NULL, 0 },
/* 0x18 */ { NULL, NULL, 0 },
/* 0x19 */ { NULL, NULL, 0 },
/* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER},
/* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER},
/* 0x1c */ { "SMBreadBs",NULL,0 },
/* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER},
/* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER},
/* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER},
/* 0x20 */ { "SMBwritec",NULL,0},
/* 0x21 */ { NULL, NULL, 0 },
/* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER},
/* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER},
/* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER},
/* 0x25 */ { "SMBtrans",reply_trans,AS_USER},
/* 0x26 */ { "SMBtranss",reply_transs,AS_USER},
/* 0x27 */ { "SMBioctl",reply_ioctl,0},
/* 0x28 */ { "SMBioctls",NULL,AS_USER},
/* 0x29 */ { "SMBcopy",reply_copy,AS_USER},
/* 0x2a */ { "SMBmove",NULL,AS_USER},
/* 0x2b */ { "SMBecho",reply_echo,0},
/* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER},
/* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER},
/* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER},
/* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER},
/* 0x30 */ { NULL, NULL, 0 },
/* 0x31 */ { NULL, NULL, 0 },
/* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER},
/* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER},
/* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER},
/* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER},
/* 0x36 */ { NULL, NULL, 0 },
/* 0x37 */ { NULL, NULL, 0 },
/* 0x38 */ { NULL, NULL, 0 },
/* 0x39 */ { NULL, NULL, 0 },
/* 0x3a */ { NULL, NULL, 0 },
/* 0x3b */ { NULL, NULL, 0 },
/* 0x3c */ { NULL, NULL, 0 },
/* 0x3d */ { NULL, NULL, 0 },
/* 0x3e */ { NULL, NULL, 0 },
/* 0x3f */ { NULL, NULL, 0 },
/* 0x40 */ { NULL, NULL, 0 },
/* 0x41 */ { NULL, NULL, 0 },
/* 0x42 */ { NULL, NULL, 0 },
/* 0x43 */ { NULL, NULL, 0 },
/* 0x44 */ { NULL, NULL, 0 },
/* 0x45 */ { NULL, NULL, 0 },
/* 0x46 */ { NULL, NULL, 0 },
/* 0x47 */ { NULL, NULL, 0 },
/* 0x48 */ { NULL, NULL, 0 },
/* 0x49 */ { NULL, NULL, 0 },
/* 0x4a */ { NULL, NULL, 0 },
/* 0x4b */ { NULL, NULL, 0 },
/* 0x4c */ { NULL, NULL, 0 },
/* 0x4d */ { NULL, NULL, 0 },
/* 0x4e */ { NULL, NULL, 0 },
/* 0x4f */ { NULL, NULL, 0 },
/* 0x50 */ { NULL, NULL, 0 },
/* 0x51 */ { NULL, NULL, 0 },
/* 0x52 */ { NULL, NULL, 0 },
/* 0x53 */ { NULL, NULL, 0 },
/* 0x54 */ { NULL, NULL, 0 },
/* 0x55 */ { NULL, NULL, 0 },
/* 0x56 */ { NULL, NULL, 0 },
/* 0x57 */ { NULL, NULL, 0 },
/* 0x58 */ { NULL, NULL, 0 },
/* 0x59 */ { NULL, NULL, 0 },
/* 0x5a */ { NULL, NULL, 0 },
/* 0x5b */ { NULL, NULL, 0 },
/* 0x5c */ { NULL, NULL, 0 },
/* 0x5d */ { NULL, NULL, 0 },
/* 0x5e */ { NULL, NULL, 0 },
/* 0x5f */ { NULL, NULL, 0 },
/* 0x60 */ { NULL, NULL, 0 },
/* 0x61 */ { NULL, NULL, 0 },
/* 0x62 */ { NULL, NULL, 0 },
/* 0x63 */ { NULL, NULL, 0 },
/* 0x64 */ { NULL, NULL, 0 },
/* 0x65 */ { NULL, NULL, 0 },
/* 0x66 */ { NULL, NULL, 0 },
/* 0x67 */ { NULL, NULL, 0 },
/* 0x68 */ { NULL, NULL, 0 },
/* 0x69 */ { NULL, NULL, 0 },
/* 0x6a */ { NULL, NULL, 0 },
/* 0x6b */ { NULL, NULL, 0 },
/* 0x6c */ { NULL, NULL, 0 },
/* 0x6d */ { NULL, NULL, 0 },
/* 0x6e */ { NULL, NULL, 0 },
/* 0x6f */ { NULL, NULL, 0 },
/* 0x70 */ { "SMBtcon",reply_tcon,0},
/* 0x71 */ { "SMBtdis",reply_tdis,0},
/* 0x72 */ { "SMBnegprot",reply_negprot,0},
/* 0x73 */ { "SMBsesssetupX",reply_sesssetup,0},
/* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */
/* 0x75 */ { "SMBtconX",reply_tcon_and_X,0},
/* 0x76 */ { NULL, NULL, 0 },
/* 0x77 */ { NULL, NULL, 0 },
/* 0x78 */ { NULL, NULL, 0 },
/* 0x79 */ { NULL, NULL, 0 },
/* 0x7a */ { NULL, NULL, 0 },
/* 0x7b */ { NULL, NULL, 0 },
/* 0x7c */ { NULL, NULL, 0 },
/* 0x7d */ { NULL, NULL, 0 },
/* 0x7e */ { NULL, NULL, 0 },
/* 0x7f */ { NULL, NULL, 0 },
/* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER},
/* 0x81 */ { "SMBsearch",reply_search,AS_USER},
/* 0x82 */ { "SMBffirst",reply_search,AS_USER},
/* 0x83 */ { "SMBfunique",reply_search,AS_USER},
/* 0x84 */ { "SMBfclose",reply_fclose,AS_USER},
/* 0x85 */ { NULL, NULL, 0 },
/* 0x86 */ { NULL, NULL, 0 },
/* 0x87 */ { NULL, NULL, 0 },
/* 0x88 */ { NULL, NULL, 0 },
/* 0x89 */ { NULL, NULL, 0 },
/* 0x8a */ { NULL, NULL, 0 },
/* 0x8b */ { NULL, NULL, 0 },
/* 0x8c */ { NULL, NULL, 0 },
/* 0x8d */ { NULL, NULL, 0 },
/* 0x8e */ { NULL, NULL, 0 },
/* 0x8f */ { NULL, NULL, 0 },
/* 0x90 */ { NULL, NULL, 0 },
/* 0x91 */ { NULL, NULL, 0 },
/* 0x92 */ { NULL, NULL, 0 },
/* 0x93 */ { NULL, NULL, 0 },
/* 0x94 */ { NULL, NULL, 0 },
/* 0x95 */ { NULL, NULL, 0 },
/* 0x96 */ { NULL, NULL, 0 },
/* 0x97 */ { NULL, NULL, 0 },
/* 0x98 */ { NULL, NULL, 0 },
/* 0x99 */ { NULL, NULL, 0 },
/* 0x9a */ { NULL, NULL, 0 },
/* 0x9b */ { NULL, NULL, 0 },
/* 0x9c */ { NULL, NULL, 0 },
/* 0x9d */ { NULL, NULL, 0 },
/* 0x9e */ { NULL, NULL, 0 },
/* 0x9f */ { NULL, NULL, 0 },
/* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER},
/* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER},
/* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER},
/* 0xa3 */ { NULL, NULL, 0 },
/* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 },
/* 0xa5 */ { "SMBntrename", reply_ntrename, 0 },
/* 0xa6 */ { NULL, NULL, 0 },
/* 0xa7 */ { NULL, NULL, 0 },
/* 0xa8 */ { NULL, NULL, 0 },
/* 0xa9 */ { NULL, NULL, 0 },
/* 0xaa */ { NULL, NULL, 0 },
/* 0xab */ { NULL, NULL, 0 },
/* 0xac */ { NULL, NULL, 0 },
/* 0xad */ { NULL, NULL, 0 },
/* 0xae */ { NULL, NULL, 0 },
/* 0xaf */ { NULL, NULL, 0 },
/* 0xb0 */ { NULL, NULL, 0 },
/* 0xb1 */ { NULL, NULL, 0 },
/* 0xb2 */ { NULL, NULL, 0 },
/* 0xb3 */ { NULL, NULL, 0 },
/* 0xb4 */ { NULL, NULL, 0 },
/* 0xb5 */ { NULL, NULL, 0 },
/* 0xb6 */ { NULL, NULL, 0 },
/* 0xb7 */ { NULL, NULL, 0 },
/* 0xb8 */ { NULL, NULL, 0 },
/* 0xb9 */ { NULL, NULL, 0 },
/* 0xba */ { NULL, NULL, 0 },
/* 0xbb */ { NULL, NULL, 0 },
/* 0xbc */ { NULL, NULL, 0 },
/* 0xbd */ { NULL, NULL, 0 },
/* 0xbe */ { NULL, NULL, 0 },
/* 0xbf */ { NULL, NULL, 0 },
/* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER },
/* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER},
/* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER},
/* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER},
/* 0xc4 */ { NULL, NULL, 0 },
/* 0xc5 */ { NULL, NULL, 0 },
/* 0xc6 */ { NULL, NULL, 0 },
/* 0xc7 */ { NULL, NULL, 0 },
/* 0xc8 */ { NULL, NULL, 0 },
/* 0xc9 */ { NULL, NULL, 0 },
/* 0xca */ { NULL, NULL, 0 },
/* 0xcb */ { NULL, NULL, 0 },
/* 0xcc */ { NULL, NULL, 0 },
/* 0xcd */ { NULL, NULL, 0 },
/* 0xce */ { NULL, NULL, 0 },
/* 0xcf */ { NULL, NULL, 0 },
/* 0xd0 */ { "SMBsends",reply_sends,0},
/* 0xd1 */ { "SMBsendb",NULL,0},
/* 0xd2 */ { "SMBfwdname",NULL,0},
/* 0xd3 */ { "SMBcancelf",NULL,0},
/* 0xd4 */ { "SMBgetmac",NULL,0},
/* 0xd5 */ { "SMBsendstrt",reply_sendstrt,0},
/* 0xd6 */ { "SMBsendend",reply_sendend,0},
/* 0xd7 */ { "SMBsendtxt",reply_sendtxt,0},
/* 0xd8 */ { NULL, NULL, 0 },
/* 0xd9 */ { NULL, NULL, 0 },
/* 0xda */ { NULL, NULL, 0 },
/* 0xdb */ { NULL, NULL, 0 },
/* 0xdc */ { NULL, NULL, 0 },
/* 0xdd */ { NULL, NULL, 0 },
/* 0xde */ { NULL, NULL, 0 },
/* 0xdf */ { NULL, NULL, 0 },
/* 0xe0 */ { NULL, NULL, 0 },
/* 0xe1 */ { NULL, NULL, 0 },
/* 0xe2 */ { NULL, NULL, 0 },
/* 0xe3 */ { NULL, NULL, 0 },
/* 0xe4 */ { NULL, NULL, 0 },
/* 0xe5 */ { NULL, NULL, 0 },
/* 0xe6 */ { NULL, NULL, 0 },
/* 0xe7 */ { NULL, NULL, 0 },
/* 0xe8 */ { NULL, NULL, 0 },
/* 0xe9 */ { NULL, NULL, 0 },
/* 0xea */ { NULL, NULL, 0 },
/* 0xeb */ { NULL, NULL, 0 },
/* 0xec */ { NULL, NULL, 0 },
/* 0xed */ { NULL, NULL, 0 },
/* 0xee */ { NULL, NULL, 0 },
/* 0xef */ { NULL, NULL, 0 },
/* 0xf0 */ { NULL, NULL, 0 },
/* 0xf1 */ { NULL, NULL, 0 },
/* 0xf2 */ { NULL, NULL, 0 },
/* 0xf3 */ { NULL, NULL, 0 },
/* 0xf4 */ { NULL, NULL, 0 },
/* 0xf5 */ { NULL, NULL, 0 },
/* 0xf6 */ { NULL, NULL, 0 },
/* 0xf7 */ { NULL, NULL, 0 },
/* 0xf8 */ { NULL, NULL, 0 },
/* 0xf9 */ { NULL, NULL, 0 },
/* 0xfa */ { NULL, NULL, 0 },
/* 0xfb */ { NULL, NULL, 0 },
/* 0xfc */ { NULL, NULL, 0 },
/* 0xfd */ { NULL, NULL, 0 },
/* 0xfe */ { NULL, NULL, 0 },
/* 0xff */ { NULL, NULL, 0 }
};

/****************************************************************************
return a string containing the function name of a SMB command
****************************************************************************/
static const char *smb_fn_name(uint8_t type)
{
	const char *unknown_name = "SMBunknown";

	if (smb_messages[type].name == NULL)
		return unknown_name;

	return smb_messages[type].name;
}


/****************************************************************************
 Do a switch on the message type and call the specific reply function for this 
message. Unlike earlier versions of Samba the reply functions are responsible
for sending the reply themselves, rather than returning a size to this function
The reply functions may also choose to delay the processing by pushing the message
onto the message queue
****************************************************************************/
static void switch_message(int type, struct smbsrv_request *req)
{
	int flags;
	struct smbsrv_connection *smb_conn = req->smb_conn;
	uint16_t session_tag;

	type &= 0xff;

	errno = 0;

	if (smb_messages[type].fn == NULL) {
		DEBUG(0,("Unknown message type %d!\n",type));
		reply_unknown(req);
		return;
	}

	flags = smb_messages[type].flags;

	req->tcon = conn_find(smb_conn, SVAL(req->in.hdr,HDR_TID));

	if (req->session == NULL) {
		/* setup the user context for this request if it
		   hasn't already been initialised (to cope with SMB
		   chaining) */

		/* In share mode security we must ignore the vuid. */
		if (lp_security() == SEC_SHARE) {
			session_tag = UID_FIELD_INVALID;
		} else {
			session_tag = SVAL(req->in.hdr,HDR_UID);
		}

		req->session = smbsrv_session_find(req->smb_conn, session_tag);
		if (req->session) {
			req->session->vuid = session_tag;
		}
	} else {
		session_tag = req->session->vuid;
	}

	DEBUG(3,("switch message %s (task_id %d)\n",smb_fn_name(type), smb_conn->connection->service->model_ops->get_id(req)));

	/* does this protocol need a valid tree connection? */
	if ((flags & AS_USER) && !req->tcon) {
		req_reply_error(req, NT_STATUS_INVALID_HANDLE);
		return;
	}

	/* see if the vuid is valid */
	if ((flags & AS_USER) && !req->session) {
		req_reply_error(req, NT_STATUS_DOS(ERRSRV, ERRbaduid));
		return;
	}

	smb_messages[type].fn(req);
}


/****************************************************************************
 Construct a reply to the incoming packet.
****************************************************************************/
static void construct_reply(struct smbsrv_request *req)
{
	uint8_t type = CVAL(req->in.hdr,HDR_COM);

	/* see if its a special NBT packet */
	if (CVAL(req->in.buffer,0) != 0) {
		reply_special(req);
		return;
	}

	/* Make sure this is an SMB packet */	
	if (memcmp(req->in.hdr,"\377SMB",4) != 0) {
		DEBUG(2,("Non-SMB packet of length %d. Terminating connection\n", 
			 req->in.size));
		smbsrv_terminate_connection(req->smb_conn, "Non-SMB packet");
		return;
	}

	if (NBT_HDR_SIZE + MIN_SMB_SIZE + 2*req->in.wct > req->in.size) {
		DEBUG(2,("Invalid SMB word count %d\n", req->in.wct));
		smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet");
		return;
	}

	if (NBT_HDR_SIZE + MIN_SMB_SIZE + 2*req->in.wct + req->in.data_size > req->in.size) {
		DEBUG(2,("Invalid SMB buffer length count %d\n", req->in.data_size));
		smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet");
		return;
	}

	req->flags = CVAL(req->in.hdr, HDR_FLG);
	req->flags2 = SVAL(req->in.hdr, HDR_FLG2);
	req->smbpid = SVAL(req->in.hdr,HDR_PID);

	if (!req_signing_check_incoming(req)) {
		req_reply_error(req, NT_STATUS_ACCESS_DENIED);
		return;
	}

	switch_message(type, req);
}


/*
  we call this when first first part of a possibly chained request has been completed
  and we need to call the 2nd part, if any
*/
void chain_reply(struct smbsrv_request *req)
{
	uint16_t chain_cmd, chain_offset;
	uint8_t *vwv, *data;
	uint16_t wct;
	uint16_t data_size;

	if (req->in.wct < 2 || req->out.wct < 2) {
		req_reply_dos_error(req, ERRSRV, ERRerror);
		return;
	}

	chain_cmd    = CVAL(req->in.vwv, VWV(0));
	chain_offset = SVAL(req->in.vwv, VWV(1));

	if (chain_cmd == SMB_CHAIN_NONE) {
		/* end of chain */
		SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
		SSVAL(req->out.vwv, VWV(1), 0);
		req_send_reply(req);
		return;
	}

	if (chain_offset + req->in.hdr >= req->in.buffer + req->in.size) {
		goto error;
	}

	wct = CVAL(req->in.hdr, chain_offset);
	vwv = req->in.hdr + chain_offset + 1;

	if (vwv + VWV(wct) + 2 > req->in.buffer + req->in.size) {
		goto error;
	}

	data_size = SVAL(vwv, VWV(wct));
	data = vwv + VWV(wct) + 2;

	if (data + data_size > req->in.buffer + req->in.size) {
		goto error;
	}

	/* all seems legit */
	req->in.vwv = vwv;
	req->in.wct = wct;
	req->in.data = data;
	req->in.data_size = data_size;
	req->in.ptr = data;

	req->chain_count++;

	SSVAL(req->out.vwv, VWV(0), chain_cmd);
	SSVAL(req->out.vwv, VWV(1), req->out.size - NBT_HDR_SIZE);

	/* the current request in the chain might have used an async reply,
	   but that doesn't mean the next element needs to */
	ZERO_STRUCTP(req->async_states);

	switch_message(chain_cmd, req);
	return;

error:
	SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE);
	SSVAL(req->out.vwv, VWV(1), 0);
	req_reply_dos_error(req, ERRSRV, ERRerror);
}


/*
  close the socket and shutdown a server_context
*/
void smbsrv_terminate_connection(struct smbsrv_connection *smb_conn, const char *reason)
{
	server_terminate_connection(smb_conn->connection, reason);
}

/*
  called on a fatal error that should cause this server to terminate
*/
static void smbsrv_exit(struct server_service *service, const char *reason)
{
	DEBUG(1,("smbsrv_exit\n"));
	return;
}

/*
  add a socket address to the list of events, one event per port
*/
static void smb_add_socket(struct server_service *service, 
			   const struct model_ops *model_ops,
			   struct socket_context *socket_ctx, 
			   struct ipv4_addr *ifip)
{
	const char **ports = lp_smb_ports();
	int i;
	char *ip_str = talloc_strdup(service, sys_inet_ntoa(*ifip));

	for (i=0;ports[i];i++) {
		uint16_t port = atoi(ports[i]);
		if (port == 0) continue;
		service_setup_socket(service, model_ops, "ipv4", ip_str, &port);
	}

	talloc_free(ip_str);
}

/****************************************************************************
 Open the socket communication.
****************************************************************************/
static void smbsrv_init(struct server_service *service, const struct model_ops *model_ops)
{	
	DEBUG(1,("smbsrv_init\n"));

	if (lp_interfaces() && lp_bind_interfaces_only()) {
		int num_interfaces = iface_count();
		int i;

		/* We have been given an interfaces line, and been 
		   told to only bind to those interfaces. Create a
		   socket per interface and bind to only these.
		*/
		for(i = 0; i < num_interfaces; i++) {
			struct ipv4_addr *ifip = iface_n_ip(i);

			if (ifip == NULL) {
				DEBUG(0,("open_sockets_smbd: interface %d has NULL IP address !\n", i));
				continue;
			}

			smb_add_socket(service, model_ops, NULL, ifip);
		}
	} else {
		struct ipv4_addr ifip;
		/* Just bind to lp_socket_address() (usually 0.0.0.0) */
		ifip = interpret_addr2(lp_socket_address());
		smb_add_socket(service, model_ops, NULL, &ifip);
	}
}

/*
  called when a SMB socket becomes readable
*/
static void smbsrv_recv(struct server_connection *conn, struct timeval t, uint16_t flags)
{
	struct smbsrv_connection *smb_conn = conn->private_data;
	NTSTATUS status;

	DEBUG(10,("smbsrv_recv\n"));

	status = receive_smb_request(smb_conn, t);
	if (NT_STATUS_IS_ERR(status)) {
		conn->event.fde->flags = 0;
		smbsrv_terminate_connection(smb_conn, nt_errstr(status));
		return;
	}

	/* free up temporary memory */
	lp_talloc_free();
}

/*
  called when a SMB socket becomes writable
*/
static void smbsrv_send(struct server_connection *conn, struct timeval t, uint16_t flags)
{
	struct smbsrv_connection *smb_conn = conn->private_data;

	while (smb_conn->pending_send) {
		struct smbsrv_request *req = smb_conn->pending_send;
		DATA_BLOB blob;
		NTSTATUS status;
		size_t sendlen;

		blob.data = req->out.buffer;
		blob.length = req->out.size;

		/* send as much of this request as we can */
		status = socket_send(conn->socket, &blob, &sendlen, 0);
		if (NT_STATUS_IS_ERR(status)) {
			smbsrv_terminate_connection(req->smb_conn, nt_errstr(status));
			return;
		}
		if (sendlen == 0) {
			break;
		}

		req->out.buffer += sendlen;
		req->out.size -= sendlen;

		/* is the whole request gone? */
		if (req->out.size == 0) {
			DLIST_REMOVE(smb_conn->pending_send, req);
			req_destroy(req);
		}
	}

	/* if no more requests are pending to be sent then
	   we should stop select for write */
	if (smb_conn->pending_send == NULL) {
		conn->event.fde->flags &= ~EVENT_FD_WRITE;
	}
}

/*
  called when connection is idle
*/
static void smbsrv_idle(struct server_connection *conn, struct timeval t)
{
	DEBUG(10,("smbsrv_idle: not implemented!\n"));
	conn->event.idle->next_event = timeval_add(&t, 5, 0);
	return;
}

static void smbsrv_close(struct server_connection *conn, const char *reason)
{
	struct smbsrv_connection *smb_conn = conn->private_data;

	DEBUG(5,("smbsrv_close: %s\n",reason));

	conn_close_all(smb_conn);

	talloc_free(smb_conn);

	return;
}

/*
  process a message from an SMB socket while still processing a
  previous message this is used by backends who need to ensure that
  new messages from clients are still processed while they are
  performing long operations
*/
void smbd_process_async(struct smbsrv_connection *smb_conn)
{
	NTSTATUS status;
	
	status = receive_smb_request(smb_conn, timeval_current());
	if (NT_STATUS_IS_ERR(status)) {
		smbsrv_terminate_connection(smb_conn, nt_errstr(status));
	}
}


/*
  initialise a server_context from a open socket and register a event handler
  for reading from that socket
*/
void smbsrv_accept(struct server_connection *conn)
{
	struct smbsrv_connection *smb_conn;

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

	smb_conn = talloc_zero_p(conn, struct smbsrv_connection);
	if (!smb_conn) return;

	smb_conn->pid = getpid();

	sub_set_context(&smb_conn->substitute);

	/* now initialise a few default values associated with this smb socket */
	smb_conn->negotiate.max_send = 0xFFFF;

	/* this is the size that w2k uses, and it appears to be important for
	   good performance */
	smb_conn->negotiate.max_recv = lp_max_xmit();

	smb_conn->negotiate.zone_offset = get_time_zone(time(NULL));

	smb_conn->sessions.next_vuid = VUID_OFFSET;

	srv_init_signing(smb_conn);

	conn_init(smb_conn);

	smb_conn->connection = conn;

	conn->private_data = smb_conn;

	/* setup the DCERPC server subsystem */
	dcesrv_init_context(smb_conn, &smb_conn->dcesrv);

	return;
}

static const struct server_service_ops smb_server_ops = {
	.name			= "smb",
	.service_init		= smbsrv_init,
	.accept_connection	= smbsrv_accept,
	.recv_handler		= smbsrv_recv,
	.send_handler		= smbsrv_send,
	.idle_handler		= smbsrv_idle,
	.close_connection	= smbsrv_close,
	.service_exit		= smbsrv_exit,	
};

const struct server_service_ops *smbsrv_get_ops(void)
{
	return &smb_server_ops;
}

NTSTATUS server_service_smb_init(void)
{
	return NT_STATUS_OK;	
}