summaryrefslogtreecommitdiff
path: root/source3/smbd/dir.c
blob: a0df924dc7ce9796f3656642b452de901abc1eeb (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
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
/* 
   Unix SMB/CIFS implementation.
   Directory handling routines
   Copyright (C) Andrew Tridgell 1992-1998
   
   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.
*/

#include "includes.h"

/*
   This module implements directory related functions for Samba.
*/

extern struct current_user current_user;

/* "Special" directory offsets. */
#define END_OF_DIRECTORY_OFFSET ((long)-1)
#define START_OF_DIRECTORY_OFFSET ((long)0)
#define DOT_DOT_DIRECTORY_OFFSET ((long)0x80000000)

/* Make directory handle internals available. */

#define NAME_CACHE_SIZE 100

struct name_cache_entry {
	char *name;
	long offset;
};

struct smb_Dir {
	connection_struct *conn;
	DIR *dir;
	long offset;
	char *dir_path;
	struct name_cache_entry *name_cache;
	unsigned int name_cache_index;
	unsigned int file_number;
};

struct dptr_struct {
	struct dptr_struct *next, *prev;
	int dnum;
	uint16 spid;
	struct connection_struct *conn;
	struct smb_Dir *dir_hnd;
	BOOL expect_close;
	char *wcard;
	uint32 attr;
	char *path;
	BOOL has_wild; /* Set to true if the wcard entry has MS wildcard characters in it. */
};

static struct bitmap *dptr_bmap;
static struct dptr_struct *dirptrs;
static int dirhandles_open = 0;

#define INVALID_DPTR_KEY (-3)

/****************************************************************************
 Make a dir struct.
****************************************************************************/

void make_dir_struct(char *buf, const char *mask, const char *fname,SMB_OFF_T size,uint32 mode,time_t date, BOOL uc)
{  
	char *p;
	pstring mask2;

	pstrcpy(mask2,mask);

	if ((mode & aDIR) != 0)
		size = 0;

	memset(buf+1,' ',11);
	if ((p = strchr_m(mask2,'.')) != NULL) {
		*p = 0;
		push_ascii(buf+1,mask2,8, 0);
		push_ascii(buf+9,p+1,3, 0);
		*p = '.';
	} else
		push_ascii(buf+1,mask2,11, 0);

	memset(buf+21,'\0',DIR_STRUCT_SIZE-21);
	SCVAL(buf,21,mode);
	put_dos_date(buf,22,date);
	SSVAL(buf,26,size & 0xFFFF);
	SSVAL(buf,28,(size >> 16)&0xFFFF);
	/* We only uppercase if FLAGS2_LONG_PATH_COMPONENTS is zero in the input buf.
	   Strange, but verified on W2K3. Needed for OS/2. JRA. */
	push_ascii(buf+30,fname,12, uc ? STR_UPPER : 0);
	DEBUG(8,("put name [%s] from [%s] into dir struct\n",buf+30, fname));
}

/****************************************************************************
 Initialise the dir bitmap.
****************************************************************************/

void init_dptrs(void)
{
	static BOOL dptrs_init=False;

	if (dptrs_init)
		return;

	dptr_bmap = bitmap_allocate(MAX_DIRECTORY_HANDLES);

	if (!dptr_bmap)
		exit_server("out of memory in init_dptrs");

	dptrs_init = True;
}

/****************************************************************************
 Idle a dptr - the directory is closed but the control info is kept.
****************************************************************************/

static void dptr_idle(struct dptr_struct *dptr)
{
	if (dptr->dir_hnd) {
		DEBUG(4,("Idling dptr dnum %d\n",dptr->dnum));
		CloseDir(dptr->dir_hnd);
		dptr->dir_hnd = NULL;
	}
}

/****************************************************************************
 Idle the oldest dptr.
****************************************************************************/

static void dptr_idleoldest(void)
{
	struct dptr_struct *dptr;

	/*
	 * Go to the end of the list.
	 */
	for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
		;

	if(!dptr) {
		DEBUG(0,("No dptrs available to idle ?\n"));
		return;
	}

	/*
	 * Idle the oldest pointer.
	 */

	for(; dptr; dptr = dptr->prev) {
		if (dptr->dir_hnd) {
			dptr_idle(dptr);
			return;
		}
	}
}

/****************************************************************************
 Get the struct dptr_struct for a dir index.
****************************************************************************/

static struct dptr_struct *dptr_get(int key, BOOL forclose)
{
	struct dptr_struct *dptr;

	for(dptr = dirptrs; dptr; dptr = dptr->next) {
		if(dptr->dnum == key) {
			if (!forclose && !dptr->dir_hnd) {
				if (dirhandles_open >= MAX_OPEN_DIRECTORIES)
					dptr_idleoldest();
				DEBUG(4,("dptr_get: Reopening dptr key %d\n",key));
				if (!(dptr->dir_hnd = OpenDir(dptr->conn, dptr->path, dptr->wcard, dptr->attr))) {
					DEBUG(4,("dptr_get: Failed to open %s (%s)\n",dptr->path,
						strerror(errno)));
					return False;
				}
			}
			DLIST_PROMOTE(dirptrs,dptr);
			return dptr;
		}
	}
	return(NULL);
}

/****************************************************************************
 Get the dir path for a dir index.
****************************************************************************/

char *dptr_path(int key)
{
	struct dptr_struct *dptr = dptr_get(key, False);
	if (dptr)
		return(dptr->path);
	return(NULL);
}

/****************************************************************************
 Get the dir wcard for a dir index.
****************************************************************************/

char *dptr_wcard(int key)
{
	struct dptr_struct *dptr = dptr_get(key, False);
	if (dptr)
		return(dptr->wcard);
	return(NULL);
}

/****************************************************************************
 Get the dir attrib for a dir index.
****************************************************************************/

uint16 dptr_attr(int key)
{
	struct dptr_struct *dptr = dptr_get(key, False);
	if (dptr)
		return(dptr->attr);
	return(0);
}

/****************************************************************************
 Close a dptr (internal func).
****************************************************************************/

static void dptr_close_internal(struct dptr_struct *dptr)
{
	DEBUG(4,("closing dptr key %d\n",dptr->dnum));

	DLIST_REMOVE(dirptrs, dptr);

	/* 
	 * Free the dnum in the bitmap. Remember the dnum value is always 
	 * biased by one with respect to the bitmap.
	 */

	if(bitmap_query( dptr_bmap, dptr->dnum - 1) != True) {
		DEBUG(0,("dptr_close_internal : Error - closing dnum = %d and bitmap not set !\n",
			dptr->dnum ));
	}

	bitmap_clear(dptr_bmap, dptr->dnum - 1);

	if (dptr->dir_hnd) {
		CloseDir(dptr->dir_hnd);
	}

	/* Lanman 2 specific code */
	SAFE_FREE(dptr->wcard);
	string_set(&dptr->path,"");
	SAFE_FREE(dptr);
}

/****************************************************************************
 Close a dptr given a key.
****************************************************************************/

void dptr_close(int *key)
{
	struct dptr_struct *dptr;

	if(*key == INVALID_DPTR_KEY)
		return;

	/* OS/2 seems to use -1 to indicate "close all directories" */
	if (*key == -1) {
		struct dptr_struct *next;
		for(dptr = dirptrs; dptr; dptr = next) {
			next = dptr->next;
			dptr_close_internal(dptr);
		}
		*key = INVALID_DPTR_KEY;
		return;
	}

	dptr = dptr_get(*key, True);

	if (!dptr) {
		DEBUG(0,("Invalid key %d given to dptr_close\n", *key));
		return;
	}

	dptr_close_internal(dptr);

	*key = INVALID_DPTR_KEY;
}

/****************************************************************************
 Close all dptrs for a cnum.
****************************************************************************/

void dptr_closecnum(connection_struct *conn)
{
	struct dptr_struct *dptr, *next;
	for(dptr = dirptrs; dptr; dptr = next) {
		next = dptr->next;
		if (dptr->conn == conn)
			dptr_close_internal(dptr);
	}
}

/****************************************************************************
 Idle all dptrs for a cnum.
****************************************************************************/

void dptr_idlecnum(connection_struct *conn)
{
	struct dptr_struct *dptr;
	for(dptr = dirptrs; dptr; dptr = dptr->next) {
		if (dptr->conn == conn && dptr->dir_hnd)
			dptr_idle(dptr);
	}
}

/****************************************************************************
 Close a dptr that matches a given path, only if it matches the spid also.
****************************************************************************/

void dptr_closepath(char *path,uint16 spid)
{
	struct dptr_struct *dptr, *next;
	for(dptr = dirptrs; dptr; dptr = next) {
		next = dptr->next;
		if (spid == dptr->spid && strequal(dptr->path,path))
			dptr_close_internal(dptr);
	}
}

/****************************************************************************
 Try and close the oldest handle not marked for
 expect close in the hope that the client has
 finished with that one.
****************************************************************************/

static void dptr_close_oldest(BOOL old)
{
	struct dptr_struct *dptr;

	/*
	 * Go to the end of the list.
	 */
	for(dptr = dirptrs; dptr && dptr->next; dptr = dptr->next)
		;

	if(!dptr) {
		DEBUG(0,("No old dptrs available to close oldest ?\n"));
		return;
	}

	/*
	 * If 'old' is true, close the oldest oldhandle dnum (ie. 1 < dnum < 256) that
	 * does not have expect_close set. If 'old' is false, close
	 * one of the new dnum handles.
	 */

	for(; dptr; dptr = dptr->prev) {
		if ((old && (dptr->dnum < 256) && !dptr->expect_close) ||
			(!old && (dptr->dnum > 255))) {
				dptr_close_internal(dptr);
				return;
		}
	}
}

/****************************************************************************
 Create a new dir ptr. If the flag old_handle is true then we must allocate
 from the bitmap range 0 - 255 as old SMBsearch directory handles are only
 one byte long. If old_handle is false we allocate from the range
 256 - MAX_DIRECTORY_HANDLES. We bias the number we return by 1 to ensure
 a directory handle is never zero.
****************************************************************************/

int dptr_create(connection_struct *conn, pstring path, BOOL old_handle, BOOL expect_close,uint16 spid,
		const char *wcard, uint32 attr)
{
	struct dptr_struct *dptr = NULL;
	struct smb_Dir *dir_hnd;
        const char *dir2;

	DEBUG(5,("dptr_create dir=%s\n", path));

	if (!check_name(path,conn))
		return(-2); /* Code to say use a unix error return code. */

	/* use a const pointer from here on */
	dir2 = path;
	if (!*dir2)
		dir2 = ".";

	dir_hnd = OpenDir(conn, dir2, wcard, attr);
	if (!dir_hnd) {
		return (-2);
	}

	string_set(&conn->dirpath,dir2);

	if (dirhandles_open >= MAX_OPEN_DIRECTORIES)
		dptr_idleoldest();

	dptr = SMB_MALLOC_P(struct dptr_struct);
	if(!dptr) {
		DEBUG(0,("malloc fail in dptr_create.\n"));
		CloseDir(dir_hnd);
		return -1;
	}

	ZERO_STRUCTP(dptr);

	if(old_handle) {

		/*
		 * This is an old-style SMBsearch request. Ensure the
		 * value we return will fit in the range 1-255.
		 */

		dptr->dnum = bitmap_find(dptr_bmap, 0);

		if(dptr->dnum == -1 || dptr->dnum > 254) {

			/*
			 * Try and close the oldest handle not marked for
			 * expect close in the hope that the client has
			 * finished with that one.
			 */

			dptr_close_oldest(True);

			/* Now try again... */
			dptr->dnum = bitmap_find(dptr_bmap, 0);
			if(dptr->dnum == -1 || dptr->dnum > 254) {
				DEBUG(0,("dptr_create: returned %d: Error - all old dirptrs in use ?\n", dptr->dnum));
				SAFE_FREE(dptr);
				CloseDir(dir_hnd);
				return -1;
			}
		}
	} else {

		/*
		 * This is a new-style trans2 request. Allocate from
		 * a range that will return 256 - MAX_DIRECTORY_HANDLES.
		 */

		dptr->dnum = bitmap_find(dptr_bmap, 255);

		if(dptr->dnum == -1 || dptr->dnum < 255) {

			/*
			 * Try and close the oldest handle close in the hope that
			 * the client has finished with that one. This will only
			 * happen in the case of the Win98 client bug where it leaks
			 * directory handles.
			 */

			dptr_close_oldest(False);

			/* Now try again... */
			dptr->dnum = bitmap_find(dptr_bmap, 255);

			if(dptr->dnum == -1 || dptr->dnum < 255) {
				DEBUG(0,("dptr_create: returned %d: Error - all new dirptrs in use ?\n", dptr->dnum));
				SAFE_FREE(dptr);
				CloseDir(dir_hnd);
				return -1;
			}
		}
	}

	bitmap_set(dptr_bmap, dptr->dnum);

	dptr->dnum += 1; /* Always bias the dnum by one - no zero dnums allowed. */

	string_set(&dptr->path,dir2);
	dptr->conn = conn;
	dptr->dir_hnd = dir_hnd;
	dptr->spid = spid;
	dptr->expect_close = expect_close;
	if (wcard) {
		dptr->wcard = SMB_STRDUP(wcard);
		if (!dptr->wcard) {
			bitmap_clear(dptr_bmap, dptr->dnum - 1);
			SAFE_FREE(dptr);
			CloseDir(dir_hnd);
			return -1;
		}
	} else {
		dptr->wcard = NULL;
	}
	dptr->attr = attr;
	if (lp_posix_pathnames() || (wcard && (wcard[0] == '.' && wcard[1] == 0))) {
		dptr->has_wild = True;
	} else {
		dptr->has_wild = ms_has_wild(wcard);
	}

	DLIST_ADD(dirptrs, dptr);

	DEBUG(3,("creating new dirptr %d for path %s, expect_close = %d\n",
		dptr->dnum,path,expect_close));  

	conn->dirptr = dptr;

	return(dptr->dnum);
}


/****************************************************************************
 Wrapper functions to access the lower level directory handles.
****************************************************************************/

int dptr_CloseDir(struct dptr_struct *dptr)
{
	return CloseDir(dptr->dir_hnd);
}

void dptr_SeekDir(struct dptr_struct *dptr, long offset)
{
	SeekDir(dptr->dir_hnd, offset);
}

long dptr_TellDir(struct dptr_struct *dptr)
{
	return TellDir(dptr->dir_hnd);
}

/****************************************************************************
 Return the next visible file name, skipping veto'd and invisible files.
****************************************************************************/

static const char *dptr_normal_ReadDirName(struct dptr_struct *dptr, long *poffset, SMB_STRUCT_STAT *pst)
{
	/* Normal search for the next file. */
	const char *name;
	while ((name = ReadDirName(dptr->dir_hnd, poffset)) != NULL) {
		if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
			return name;
		}
	}
	return NULL;
}

/****************************************************************************
 Return the next visible file name, skipping veto'd and invisible files.
****************************************************************************/

const char *dptr_ReadDirName(struct dptr_struct *dptr, long *poffset, SMB_STRUCT_STAT *pst)
{
	pstring pathreal;

	SET_STAT_INVALID(*pst);

	if (dptr->has_wild) {
		return dptr_normal_ReadDirName(dptr, poffset, pst);
	}

	/* If poffset is -1 then we know we returned this name before and we have
	   no wildcards. We're at the end of the directory. */
	if (*poffset == END_OF_DIRECTORY_OFFSET) {
		return NULL;
	}

	/* We know the stored wcard contains no wildcard characters. See if we can match
	   with a stat call. If we can't, then set has_wild to true to
	   prevent us from doing this on every call. */

	/* First check if it should be visible. */
	if (!is_visible_file(dptr->conn, dptr->path, dptr->wcard, pst, True)) {
		dptr->has_wild = True;
		return dptr_normal_ReadDirName(dptr, poffset, pst);
	}

	if (VALID_STAT(*pst)) {
		/* We need to set the underlying dir_hdn offset to -1 also as
		   this function is usually called with the output from TellDir. */
		dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
		return dptr->wcard;
	}

	pstrcpy(pathreal,dptr->path);
	pstrcat(pathreal,"/");
	pstrcat(pathreal,dptr->wcard);

	if (SMB_VFS_STAT(dptr->conn,pathreal,pst) == 0) {
		/* We need to set the underlying dir_hdn offset to -1 also as
		   this function is usually called with the output from TellDir. */
		dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
		return dptr->wcard;
	} else {
		/* If we get any other error than ENOENT or ENOTDIR
		   then the file exists we just can't stat it. */
		if (errno != ENOENT && errno != ENOTDIR) {
			/* We need to set the underlying dir_hdn offset to -1 also as
			   this function is usually called with the output from TellDir. */
			dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
			return dptr->wcard;
		}
	}

	/* In case sensitive mode we don't search - we know if it doesn't exist 
	   with a stat we will fail. */

	if (dptr->conn->case_sensitive) {
		/* We need to set the underlying dir_hdn offset to -1 also as
		   this function is usually called with the output from TellDir. */
		dptr->dir_hnd->offset = *poffset = END_OF_DIRECTORY_OFFSET;
		return NULL;
	} else {
		dptr->has_wild = True;
		return dptr_normal_ReadDirName(dptr, poffset, pst);
	}
}

/****************************************************************************
 Search for a file by name, skipping veto'ed and not visible files.
****************************************************************************/

BOOL dptr_SearchDir(struct dptr_struct *dptr, const char *name, long *poffset, SMB_STRUCT_STAT *pst)
{
	SET_STAT_INVALID(*pst);

	if (!dptr->has_wild && (dptr->dir_hnd->offset == END_OF_DIRECTORY_OFFSET)) {
		/* This is a singleton directory and we're already at the end. */
		*poffset = END_OF_DIRECTORY_OFFSET;
		return False;
	}

	if (SearchDir(dptr->dir_hnd, name, poffset)) {
		if (is_visible_file(dptr->conn, dptr->path, name, pst, True)) {
			return True;
		}
	}
	return False;
}

/****************************************************************************
 Fill the 5 byte server reserved dptr field.
****************************************************************************/

BOOL dptr_fill(char *buf1,unsigned int key)
{
	unsigned char *buf = (unsigned char *)buf1;
	struct dptr_struct *dptr = dptr_get(key, False);
	uint32 offset;
	if (!dptr) {
		DEBUG(1,("filling null dirptr %d\n",key));
		return(False);
	}
	offset = (uint32)TellDir(dptr->dir_hnd);
	DEBUG(6,("fill on key %u dirptr 0x%lx now at %d\n",key,
		(long)dptr->dir_hnd,(int)offset));
	buf[0] = key;
	SIVAL(buf,1,offset);
	return(True);
}

/****************************************************************************
 Fetch the dir ptr and seek it given the 5 byte server field.
****************************************************************************/

struct dptr_struct *dptr_fetch(char *buf,int *num)
{
	unsigned int key = *(unsigned char *)buf;
	struct dptr_struct *dptr = dptr_get(key, False);
	uint32 offset;
	long seekoff;

	if (!dptr) {
		DEBUG(3,("fetched null dirptr %d\n",key));
		return(NULL);
	}
	*num = key;
	offset = IVAL(buf,1);
	if (offset == (uint32)-1) {
		seekoff = END_OF_DIRECTORY_OFFSET;
	} else {
		seekoff = (long)offset;
	}
	SeekDir(dptr->dir_hnd,seekoff);
	DEBUG(3,("fetching dirptr %d for path %s at offset %d\n",
		key,dptr_path(key),(int)seekoff));
	return(dptr);
}

/****************************************************************************
 Fetch the dir ptr.
****************************************************************************/

struct dptr_struct *dptr_fetch_lanman2(int dptr_num)
{
	struct dptr_struct *dptr  = dptr_get(dptr_num, False);

	if (!dptr) {
		DEBUG(3,("fetched null dirptr %d\n",dptr_num));
		return(NULL);
	}
	DEBUG(3,("fetching dirptr %d for path %s\n",dptr_num,dptr_path(dptr_num)));
	return(dptr);
}

/****************************************************************************
 Check a filetype for being valid.
****************************************************************************/

BOOL dir_check_ftype(connection_struct *conn, uint32 mode, uint32 dirtype)
{
	uint32 mask;

	/* Check the "may have" search bits. */
	if (((mode & ~dirtype) & (aHIDDEN | aSYSTEM | aDIR)) != 0)
		return False;

	/* Check the "must have" bits, which are the may have bits shifted eight */
	/* If must have bit is set, the file/dir can not be returned in search unless the matching
		file attribute is set */
	mask = ((dirtype >> 8) & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM)); /* & 0x37 */
	if(mask) {
		if((mask & (mode & (aDIR|aARCH|aRONLY|aHIDDEN|aSYSTEM))) == mask)   /* check if matching attribute present */
			return True;
		else
			return False;
	}

	return True;
}

static BOOL mangle_mask_match(connection_struct *conn, fstring filename, char *mask)
{
	mangle_map(filename,True,False,SNUM(conn));
	return mask_match_search(filename,mask,False);
}

/****************************************************************************
 Get an 8.3 directory entry.
****************************************************************************/

BOOL get_dir_entry(connection_struct *conn,char *mask,uint32 dirtype, pstring fname,
                   SMB_OFF_T *size,uint32 *mode,time_t *date,BOOL check_descend)
{
	const char *dname;
	BOOL found = False;
	SMB_STRUCT_STAT sbuf;
	pstring path;
	pstring pathreal;
	pstring filename;
	BOOL needslash;

	*path = *pathreal = *filename = 0;

	needslash = ( conn->dirpath[strlen(conn->dirpath) -1] != '/');

	if (!conn->dirptr)
		return(False);

	while (!found) {
		long curoff = dptr_TellDir(conn->dirptr);
		dname = dptr_ReadDirName(conn->dirptr, &curoff, &sbuf);

		DEBUG(6,("readdir on dirptr 0x%lx now at offset %ld\n",
			(long)conn->dirptr,TellDir(conn->dirptr->dir_hnd)));
      
		if (dname == NULL) 
			return(False);
      
		pstrcpy(filename,dname);      

		/* notice the special *.* handling. This appears to be the only difference
			between the wildcard handling in this routine and in the trans2 routines.
			see masktest for a demo
		*/
		if ((strcmp(mask,"*.*") == 0) ||
		    mask_match_search(filename,mask,False) ||
		    mangle_mask_match(conn,filename,mask)) {

			if (!mangle_is_8_3(filename, False, SNUM(conn)))
				mangle_map(filename,True,False,SNUM(conn));

			pstrcpy(fname,filename);
			*path = 0;
			pstrcpy(path,conn->dirpath);
			if(needslash)
				pstrcat(path,"/");
			pstrcpy(pathreal,path);
			pstrcat(path,fname);
			pstrcat(pathreal,dname);
			if (!VALID_STAT(sbuf) && (SMB_VFS_STAT(conn, pathreal, &sbuf)) != 0) {
				DEBUG(5,("Couldn't stat 1 [%s]. Error = %s\n",path, strerror(errno) ));
				continue;
			}
	  
			*mode = dos_mode(conn,pathreal,&sbuf);

			if (!dir_check_ftype(conn,*mode,dirtype)) {
				DEBUG(5,("[%s] attribs didn't match %x\n",filename,(unsigned int)dirtype));
				continue;
			}

			*size = sbuf.st_size;
			*date = sbuf.st_mtime;

			DEBUG(3,("get_dir_entry mask=[%s] found %s fname=%s\n",mask, pathreal,fname));

			found = True;
		}
	}

	return(found);
}

/*******************************************************************
 Check to see if a user can read a file. This is only approximate,
 it is used as part of the "hide unreadable" option. Don't
 use it for anything security sensitive.
********************************************************************/

static BOOL user_can_read_file(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
{
	SEC_DESC *psd = NULL;
	size_t sd_size;
	files_struct *fsp;
	NTSTATUS status;
	uint32 access_granted;

	/*
	 * If user is a member of the Admin group
	 * we never hide files from them.
	 */

	if (conn->admin_user) {
		return True;
	}

	/* If we can't stat it does not show it */
	if (!VALID_STAT(*pst) && (SMB_VFS_STAT(conn, name, pst) != 0)) {
		return False;
	}

	/* Pseudo-open the file (note - no fd's created). */

	if(S_ISDIR(pst->st_mode)) {
		 fsp = open_directory(conn, name, pst,
			READ_CONTROL_ACCESS,
			FILE_SHARE_READ|FILE_SHARE_WRITE,
			FILE_OPEN,
			0, /* no create options. */
			NULL);
	} else {
		fsp = open_file_stat(conn, name, pst);
	}

	if (!fsp) {
		return False;
	}

	/* Get NT ACL -allocated in main loop talloc context. No free needed here. */
	sd_size = SMB_VFS_FGET_NT_ACL(fsp, fsp->fh->fd,
			(OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION), &psd);
	close_file(fsp, True);

	/* No access if SD get failed. */
	if (!sd_size) {
		return False;
	}

	return se_access_check(psd, current_user.nt_user_token, FILE_READ_DATA,
                                 &access_granted, &status);
}

/*******************************************************************
 Check to see if a user can write a file (and only files, we do not
 check dirs on this one). This is only approximate,
 it is used as part of the "hide unwriteable" option. Don't
 use it for anything security sensitive.
********************************************************************/

static BOOL user_can_write_file(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
{
	SEC_DESC *psd = NULL;
	size_t sd_size;
	files_struct *fsp;
	int info;
	NTSTATUS status;
	uint32 access_granted;

	/*
	 * If user is a member of the Admin group
	 * we never hide files from them.
	 */

	if (conn->admin_user) {
		return True;
	}

	/* If we can't stat it does not show it */
	if (!VALID_STAT(*pst) && (SMB_VFS_STAT(conn, name, pst) != 0)) {
		return False;
	}

	/* Pseudo-open the file */

	if(S_ISDIR(pst->st_mode)) {
		return True;
	} else {
		fsp = open_file_ntcreate(conn, name, pst,
			FILE_WRITE_ATTRIBUTES,
			FILE_SHARE_READ|FILE_SHARE_WRITE,
			FILE_OPEN,
			0,
			FILE_ATTRIBUTE_NORMAL,
			INTERNAL_OPEN_ONLY,
			&info);
	}

	if (!fsp) {
		return False;
	}

	/* Get NT ACL -allocated in main loop talloc context. No free needed here. */
	sd_size = SMB_VFS_FGET_NT_ACL(fsp, fsp->fh->fd,
			(OWNER_SECURITY_INFORMATION|GROUP_SECURITY_INFORMATION|DACL_SECURITY_INFORMATION), &psd);
	close_file(fsp, False);

	/* No access if SD get failed. */
	if (!sd_size)
		return False;

	return se_access_check(psd, current_user.nt_user_token, FILE_WRITE_DATA,
                                 &access_granted, &status);
}

/*******************************************************************
  Is a file a "special" type ?
********************************************************************/

static BOOL file_is_special(connection_struct *conn, char *name, SMB_STRUCT_STAT *pst)
{
	/*
	 * If user is a member of the Admin group
	 * we never hide files from them.
	 */

	if (conn->admin_user)
		return False;

	/* If we can't stat it does not show it */
	if (!VALID_STAT(*pst) && (SMB_VFS_STAT(conn, name, pst) != 0))
		return True;

	if (S_ISREG(pst->st_mode) || S_ISDIR(pst->st_mode) || S_ISLNK(pst->st_mode))
		return False;

	return True;
}

/*******************************************************************
 Should the file be seen by the client ?
********************************************************************/

BOOL is_visible_file(connection_struct *conn, const char *dir_path, const char *name, SMB_STRUCT_STAT *pst, BOOL use_veto)
{
	BOOL hide_unreadable = lp_hideunreadable(SNUM(conn));
	BOOL hide_unwriteable = lp_hideunwriteable_files(SNUM(conn));
	BOOL hide_special = lp_hide_special_files(SNUM(conn));

	SET_STAT_INVALID(*pst);

	if ((strcmp(".",name) == 0) || (strcmp("..",name) == 0)) {
		return True; /* . and .. are always visible. */
	}

	/* If it's a vetoed file, pretend it doesn't even exist */
	if (use_veto && IS_VETO_PATH(conn, name)) {
		return False;
	}

	if (hide_unreadable || hide_unwriteable || hide_special) {
		char *entry = NULL;

		if (asprintf(&entry, "%s/%s", dir_path, name) == -1) {
			return False;
		}
		/* Honour _hide unreadable_ option */
		if (hide_unreadable && !user_can_read_file(conn, entry, pst)) {
			SAFE_FREE(entry);
			return False;
		}
		/* Honour _hide unwriteable_ option */
		if (hide_unwriteable && !user_can_write_file(conn, entry, pst)) {
			SAFE_FREE(entry);
			return False;
		}
		/* Honour _hide_special_ option */
		if (hide_special && file_is_special(conn, entry, pst)) {
			SAFE_FREE(entry);
			return False;
		}
		SAFE_FREE(entry);
	}
	return True;
}

/*******************************************************************
 Open a directory.
********************************************************************/

struct smb_Dir *OpenDir(connection_struct *conn, const char *name, const char *mask, uint32 attr)
{
	struct smb_Dir *dirp = SMB_MALLOC_P(struct smb_Dir);
	if (!dirp) {
		return NULL;
	}
	ZERO_STRUCTP(dirp);

	dirp->conn = conn;

	dirp->dir_path = SMB_STRDUP(name);
	if (!dirp->dir_path) {
		goto fail;
	}
	dirp->dir = SMB_VFS_OPENDIR(conn, dirp->dir_path, mask, attr);
	if (!dirp->dir) {
		DEBUG(5,("OpenDir: Can't open %s. %s\n", dirp->dir_path, strerror(errno) ));
		goto fail;
	}

	dirp->name_cache = SMB_CALLOC_ARRAY(struct name_cache_entry, NAME_CACHE_SIZE);
	if (!dirp->name_cache) {
		goto fail;
	}

	dirhandles_open++;
	return dirp;

  fail:

	if (dirp) {
		if (dirp->dir) {
			SMB_VFS_CLOSEDIR(conn,dirp->dir);
		}
		SAFE_FREE(dirp->dir_path);
		SAFE_FREE(dirp->name_cache);
		SAFE_FREE(dirp);
	}
	return NULL;
}


/*******************************************************************
 Close a directory.
********************************************************************/

int CloseDir(struct smb_Dir *dirp)
{
	int i, ret = 0;

	if (dirp->dir) {
		ret = SMB_VFS_CLOSEDIR(dirp->conn,dirp->dir);
	}
	SAFE_FREE(dirp->dir_path);
	if (dirp->name_cache) {
		for (i = 0; i < NAME_CACHE_SIZE; i++) {
			SAFE_FREE(dirp->name_cache[i].name);
		}
	}
	SAFE_FREE(dirp->name_cache);
	SAFE_FREE(dirp);
	dirhandles_open--;
	return ret;
}

/*******************************************************************
 Read from a directory. Also return current offset.
 Don't check for veto or invisible files.
********************************************************************/

const char *ReadDirName(struct smb_Dir *dirp, long *poffset)
{
	const char *n;
	connection_struct *conn = dirp->conn;

	/* Cheat to allow . and .. to be the first entries returned. */
	if (((*poffset == START_OF_DIRECTORY_OFFSET) || (*poffset == DOT_DOT_DIRECTORY_OFFSET)) && (dirp->file_number < 2)) {
		if (dirp->file_number == 0) {
			n = ".";
			*poffset = dirp->offset = START_OF_DIRECTORY_OFFSET;
		} else {
			*poffset = dirp->offset = DOT_DOT_DIRECTORY_OFFSET;
			n = "..";
		}
		dirp->file_number++;
		return n;
	} else {
		/* A real offset, seek to it. */
		SeekDir(dirp, *poffset);
	}

	while ((n = vfs_readdirname(conn, dirp->dir))) {
		struct name_cache_entry *e;
		/* Ignore . and .. - we've already returned them. */
		if (*n == '.') {
			if ((n[1] == '\0') || (n[1] == '.' && n[2] == '\0')) {
				continue;
			}
		}
		dirp->offset = SMB_VFS_TELLDIR(conn, dirp->dir);
		dirp->name_cache_index = (dirp->name_cache_index+1) % NAME_CACHE_SIZE;
		e = &dirp->name_cache[dirp->name_cache_index];
		SAFE_FREE(e->name);
		e->name = SMB_STRDUP(n);
		*poffset = e->offset= dirp->offset;
		dirp->file_number++;
		return e->name;
	}
	dirp->offset = END_OF_DIRECTORY_OFFSET;
	return NULL;
}

/*******************************************************************
 Rewind to the start.
********************************************************************/

void RewindDir(struct smb_Dir *dirp, long *poffset)
{
	SMB_VFS_REWINDDIR(dirp->conn, dirp->dir);
	dirp->file_number = 0;
	dirp->offset = START_OF_DIRECTORY_OFFSET;
	*poffset = START_OF_DIRECTORY_OFFSET;
}

/*******************************************************************
 Seek a dir.
********************************************************************/

void SeekDir(struct smb_Dir *dirp, long offset)
{
	if (offset != dirp->offset) {
		if (offset == START_OF_DIRECTORY_OFFSET || offset == DOT_DOT_DIRECTORY_OFFSET) {
			RewindDir(dirp, &offset);
		} else {
			SMB_VFS_SEEKDIR(dirp->conn, dirp->dir, offset);
		}
		dirp->offset = offset;
	}
}

/*******************************************************************
 Tell a dir position.
********************************************************************/

long TellDir(struct smb_Dir *dirp)
{
	return(dirp->offset);
}

/*******************************************************************
 Find an entry by name. Leave us at the offset after it.
 Don't check for veto or invisible files.
********************************************************************/

BOOL SearchDir(struct smb_Dir *dirp, const char *name, long *poffset)
{
	int i;
	const char *entry;
	connection_struct *conn = dirp->conn;

	/* Search back in the name cache. */
	for (i = dirp->name_cache_index; i >= 0; i--) {
		struct name_cache_entry *e = &dirp->name_cache[i];
		if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
			*poffset = e->offset;
			SeekDir(dirp, e->offset);
			return True;
		}
	}
	for (i = NAME_CACHE_SIZE-1; i > dirp->name_cache_index; i--) {
		struct name_cache_entry *e = &dirp->name_cache[i];
		if (e->name && (conn->case_sensitive ? (strcmp(e->name, name) == 0) : strequal(e->name, name))) {
			*poffset = e->offset;
			SeekDir(dirp, e->offset);
			return True;
		}
	}

	/* Not found in the name cache. Rewind directory and start from scratch. */
	SMB_VFS_REWINDDIR(conn, dirp->dir);
	dirp->file_number = 0;
	*poffset = START_OF_DIRECTORY_OFFSET;
	while ((entry = ReadDirName(dirp, poffset))) {
		if (conn->case_sensitive ? (strcmp(entry, name) == 0) : strequal(entry, name)) {
			return True;
		}
	}
	return False;
}