summaryrefslogtreecommitdiff
path: root/source3/smbd/filename.c
blob: 4238e58d106b675e4bfb6b5c1cced2932f8c0be7 (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
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
/*
   Unix SMB/CIFS implementation.
   filename handling routines
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 1999-2007
   Copyright (C) Ying Chen 2000
   Copyright (C) Volker Lendecke 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/>.
*/

/*
 * New hash table stat cache code added by Ying Chen.
 */

#include "includes.h"
#include "system/filesys.h"
#include "fake_file.h"

static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
				  connection_struct *conn,
				  const char *orig_path,
				  struct smb_filename *smb_fname);

/****************************************************************************
 Mangle the 2nd name and check if it is then equal to the first name.
****************************************************************************/

static bool mangled_equal(const char *name1,
			const char *name2,
			const struct share_params *p)
{
	char mname[13];

	if (!name_to_8_3(name2, mname, False, p)) {
		return False;
	}
	return strequal(name1, mname);
}

/****************************************************************************
 Cope with the differing wildcard and non-wildcard error cases.
****************************************************************************/

static NTSTATUS determine_path_error(const char *name,
			bool allow_wcard_last_component)
{
	const char *p;

	if (!allow_wcard_last_component) {
		/* Error code within a pathname. */
		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
	}

	/* We're terminating here so we
	 * can be a little slower and get
	 * the error code right. Windows
	 * treats the last part of the pathname
	 * separately I think, so if the last
	 * component is a wildcard then we treat
	 * this ./ as "end of component" */

	p = strchr(name, '/');

	if (!p && (ms_has_wild(name) || ISDOT(name))) {
		/* Error code at the end of a pathname. */
		return NT_STATUS_OBJECT_NAME_INVALID;
	} else {
		/* Error code within a pathname. */
		return NT_STATUS_OBJECT_PATH_NOT_FOUND;
	}
}

static NTSTATUS check_for_dot_component(const struct smb_filename *smb_fname)
{
	/* Ensure we catch all names with in "/."
	   this is disallowed under Windows and
	   in POSIX they've already been removed. */
	const char *p = strstr(smb_fname->base_name, "/."); /*mb safe*/
	if (p) {
		if (p[2] == '/') {
			/* Error code within a pathname. */
			return NT_STATUS_OBJECT_PATH_NOT_FOUND;
		} else if (p[2] == '\0') {
			/* Error code at the end of a pathname. */
			return NT_STATUS_OBJECT_NAME_INVALID;
		}
	}
	return NT_STATUS_OK;
}

/****************************************************************************
 Optimization for common case where the missing part
 is in the last component and the client already
 sent the correct case.
 Returns NT_STATUS_OK to mean continue the tree walk
 (possibly with modified start pointer).
 Any other NT_STATUS_XXX error means terminate the path
 lookup here.
****************************************************************************/

static NTSTATUS check_parent_exists(TALLOC_CTX *ctx,
				connection_struct *conn,
				bool posix_pathnames,
				struct smb_filename *smb_fname,
				char **pp_dirpath,
				char **pp_start)
{
	struct smb_filename parent_fname;
	const char *last_component = NULL;
	NTSTATUS status;
	int ret;

	ZERO_STRUCT(parent_fname);
	if (!parent_dirname(ctx, smb_fname->base_name,
				&parent_fname.base_name,
				&last_component)) {
		return NT_STATUS_NO_MEMORY;
	}

	/*
	 * If there was no parent component in
	 * smb_fname->base_name of the parent name
	 * contained a wildcard then don't do this
	 * optimization.
	 */
	if ((smb_fname->base_name == last_component) ||
			ms_has_wild(parent_fname.base_name)) {
		return NT_STATUS_OK;
	}

	if (posix_pathnames) {
		ret = SMB_VFS_LSTAT(conn, &parent_fname);
	} else {
		ret = SMB_VFS_STAT(conn, &parent_fname);
	}

	/* If the parent stat failed, just continue
	   with the normal tree walk. */

	if (ret == -1) {
		return NT_STATUS_OK;
	}

	status = check_for_dot_component(&parent_fname);
	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	/* Parent exists - set "start" to be the
	 * last compnent to shorten the tree walk. */

	/*
	 * Safe to use CONST_DISCARD
	 * here as last_component points
	 * into our smb_fname->base_name.
	 */
	*pp_start = CONST_DISCARD(char *,last_component);

	/* Update dirpath. */
	TALLOC_FREE(*pp_dirpath);
	*pp_dirpath = talloc_strdup(ctx, parent_fname.base_name);
	if (!*pp_dirpath) {
		return NT_STATUS_NO_MEMORY;
	}

	DEBUG(5,("check_parent_exists: name "
		"= %s, dirpath = %s, "
		"start = %s\n",
		smb_fname->base_name,
		*pp_dirpath,
		*pp_start));

	return NT_STATUS_OK;
}

/****************************************************************************
This routine is called to convert names from the dos namespace to unix
namespace. It needs to handle any case conversions, mangling, format changes,
streams etc.

We assume that we have already done a chdir() to the right "root" directory
for this service.

The function will return an NTSTATUS error if some part of the name except for
the last part cannot be resolved, else NT_STATUS_OK.

Note NT_STATUS_OK doesn't mean the name exists or is valid, just that we
didn't get any fatal errors that should immediately terminate the calling SMB
processing whilst resolving.

If the UCF_SAVE_LCOMP flag is passed in, then the unmodified last component
of the pathname is set in smb_filename->original_lcomp.

If UCF_ALWAYS_ALLOW_WCARD_LCOMP is passed in, then a MS wildcard was detected
and should be allowed in the last component of the path only.

If the orig_path was a stream, smb_filename->base_name will point to the base
filename, and smb_filename->stream_name will point to the stream name.  If
orig_path was not a stream, then smb_filename->stream_name will be NULL.

On exit from unix_convert, the smb_filename->st stat struct will be populated
if the file exists and was found, if not this stat struct will be filled with
zeros (and this can be detected by checking for nlinks = 0, which can never be
true for any file).
****************************************************************************/

NTSTATUS unix_convert(TALLOC_CTX *ctx,
		      connection_struct *conn,
		      const char *orig_path,
		      struct smb_filename **smb_fname_out,
		      uint32_t ucf_flags)
{
	struct smb_filename *smb_fname = NULL;
	char *start, *end;
	char *dirpath = NULL;
	char *stream = NULL;
	bool component_was_mangled = False;
	bool name_has_wildcard = False;
	bool posix_pathnames = false;
	bool allow_wcard_last_component =
	    (ucf_flags & UCF_ALWAYS_ALLOW_WCARD_LCOMP);
	bool save_last_component = ucf_flags & UCF_SAVE_LCOMP;
	NTSTATUS status;
	int ret = -1;

	*smb_fname_out = NULL;

	smb_fname = talloc_zero(ctx, struct smb_filename);
	if (smb_fname == NULL) {
		return NT_STATUS_NO_MEMORY;
	}

	if (conn->printer) {
		/* we don't ever use the filenames on a printer share as a
			filename - so don't convert them */
		if (!(smb_fname->base_name = talloc_strdup(smb_fname,
							   orig_path))) {
			status = NT_STATUS_NO_MEMORY;
			goto err;
		}
		goto done;
	}

	DEBUG(5, ("unix_convert called on file \"%s\"\n", orig_path));

	/*
	 * Conversion to basic unix format is already done in
	 * check_path_syntax().
	 */

	/*
	 * Names must be relative to the root of the service - any leading /.
	 * and trailing /'s should have been trimmed by check_path_syntax().
	 */

#ifdef DEVELOPER
	SMB_ASSERT(*orig_path != '/');
#endif

	/*
	 * If we trimmed down to a single '\0' character
	 * then we should use the "." directory to avoid
	 * searching the cache, but not if we are in a
	 * printing share.
	 * As we know this is valid we can return true here.
	 */

	if (!*orig_path) {
		if (!(smb_fname->base_name = talloc_strdup(smb_fname, "."))) {
			status = NT_STATUS_NO_MEMORY;
			goto err;
		}
		if (SMB_VFS_STAT(conn, smb_fname) != 0) {
			status = map_nt_error_from_unix(errno);
			goto err;
		}
		DEBUG(5, ("conversion finished \"\" -> %s\n",
			  smb_fname->base_name));
		goto done;
	}

	if (orig_path[0] == '.' && (orig_path[1] == '/' ||
				orig_path[1] == '\0')) {
		/* Start of pathname can't be "." only. */
		if (orig_path[1] == '\0' || orig_path[2] == '\0') {
			status = NT_STATUS_OBJECT_NAME_INVALID;
		} else {
			status =determine_path_error(&orig_path[2],
			    allow_wcard_last_component);
		}
		goto err;
	}

	/* Start with the full orig_path as given by the caller. */
	if (!(smb_fname->base_name = talloc_strdup(smb_fname, orig_path))) {
		DEBUG(0, ("talloc_strdup failed\n"));
		status = NT_STATUS_NO_MEMORY;
		goto err;
	}

	/*
	 * Large directory fix normalization. If we're case sensitive, and
	 * the case preserving parameters are set to "no", normalize the case of
	 * the incoming filename from the client WHETHER IT EXISTS OR NOT !
	 * This is in conflict with the current (3.0.20) man page, but is
	 * what people expect from the "large directory howto". I'll update
	 * the man page. Thanks to jht@samba.org for finding this. JRA.
	 */

	if (conn->case_sensitive && !conn->case_preserve &&
			!conn->short_case_preserve) {
		strnorm(smb_fname->base_name, lp_defaultcase(SNUM(conn)));
	}

	/*
	 * Ensure saved_last_component is valid even if file exists.
	 */

	if(save_last_component) {
		end = strrchr_m(smb_fname->base_name, '/');
		if (end) {
			smb_fname->original_lcomp = talloc_strdup(smb_fname,
								  end + 1);
		} else {
			smb_fname->original_lcomp =
			    talloc_strdup(smb_fname, smb_fname->base_name);
		}
		if (smb_fname->original_lcomp == NULL) {
			status = NT_STATUS_NO_MEMORY;
			goto err;
		}
	}

	posix_pathnames = (lp_posix_pathnames() ||
				(ucf_flags & UCF_POSIX_PATHNAMES));

	/*
	 * Strip off the stream, and add it back when we're done with the
	 * base_name.
	 */
	if (!posix_pathnames) {
		stream = strchr_m(smb_fname->base_name, ':');

		if (stream != NULL) {
			char *tmp = talloc_strdup(smb_fname, stream);
			if (tmp == NULL) {
				status = NT_STATUS_NO_MEMORY;
				goto err;
			}
			/*
			 * Since this is actually pointing into
			 * smb_fname->base_name this truncates base_name.
			 */
			*stream = '\0';
			stream = tmp;
		}
	}

	start = smb_fname->base_name;

	/*
	 * If we're providing case insensitive semantics or
	 * the underlying filesystem is case insensitive,
	 * then a case-normalized hit in the stat-cache is
	 * authoratitive. JRA.
	 *
	 * Note: We're only checking base_name.  The stream_name will be
	 * added and verified in build_stream_path().
	 */

	if((!conn->case_sensitive || !(conn->fs_capabilities &
				       FILE_CASE_SENSITIVE_SEARCH)) &&
	    stat_cache_lookup(conn, &smb_fname->base_name, &dirpath, &start,
			      &smb_fname->st)) {
		goto done;
	}

	/*
	 * Make sure "dirpath" is an allocated string, we use this for
	 * building the directories with talloc_asprintf and free it.
	 */

	if ((dirpath == NULL) && (!(dirpath = talloc_strdup(ctx,"")))) {
		DEBUG(0, ("talloc_strdup failed\n"));
		status = NT_STATUS_NO_MEMORY;
		goto err;
	}

	/*
	 * If we have a wildcard we must walk the path to
	 * find where the error is, even if case sensitive
	 * is true.
	 */

	name_has_wildcard = ms_has_wild(smb_fname->base_name);
	if (name_has_wildcard && !allow_wcard_last_component) {
		/* Wildcard not valid anywhere. */
		status = NT_STATUS_OBJECT_NAME_INVALID;
		goto fail;
	}

	DEBUG(5,("unix_convert begin: name = %s, dirpath = %s, start = %s\n",
		 smb_fname->base_name, dirpath, start));

	if (!name_has_wildcard) {
		/*
		 * stat the name - if it exists then we can add the stream back (if
		 * there was one) and be done!
		 */

		if (posix_pathnames) {
			ret = SMB_VFS_LSTAT(conn, smb_fname);
		} else {
			ret = SMB_VFS_STAT(conn, smb_fname);
		}

		if (ret == 0) {
			status = check_for_dot_component(smb_fname);
			if (!NT_STATUS_IS_OK(status)) {
				goto fail;
			}
			/* Add the path (not including the stream) to the cache. */
			stat_cache_add(orig_path, smb_fname->base_name,
				       conn->case_sensitive);
			DEBUG(5,("conversion of base_name finished %s -> %s\n",
				 orig_path, smb_fname->base_name));
			goto done;
		}

		if (errno == ENOENT) {
			/* Optimization when creating a new file - only
			   the last component doesn't exist. */
			status = check_parent_exists(ctx,
						conn,
						posix_pathnames,
						smb_fname,
						&dirpath,
						&start);
			if (!NT_STATUS_IS_OK(status)) {
				goto fail;
			}
		}

		/*
		 * A special case - if we don't have any wildcards or mangling chars and are case
		 * sensitive or the underlying filesystem is case insensitive then searching
		 * won't help.
		 */

		if ((conn->case_sensitive || !(conn->fs_capabilities &
					FILE_CASE_SENSITIVE_SEARCH)) &&
				!mangle_is_mangled(smb_fname->base_name, conn->params)) {

			status = check_for_dot_component(smb_fname);
			if (!NT_STATUS_IS_OK(status)) {
				goto fail;
			}

			/*
			 * The stat failed. Could be ok as it could be
 			 * a new file.
 			 */

			if (errno == ENOTDIR || errno == ELOOP) {
				status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
				goto fail;
			} else if (errno == ENOENT) {
				/*
				 * Was it a missing last component ?
				 * or a missing intermediate component ?
				 */
				struct smb_filename parent_fname;
				const char *last_component = NULL;

				ZERO_STRUCT(parent_fname);
				if (!parent_dirname(ctx, smb_fname->base_name,
							&parent_fname.base_name,
							&last_component)) {
					status = NT_STATUS_NO_MEMORY;
					goto fail;
				}
				if (posix_pathnames) {
					ret = SMB_VFS_LSTAT(conn, &parent_fname);
				} else {
					ret = SMB_VFS_STAT(conn, &parent_fname);
				}
				if (ret == -1) {
					if (errno == ENOTDIR ||
							errno == ENOENT ||
							errno == ELOOP) {
						status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
						goto fail;
					}
				}

				/*
				 * Missing last component is ok - new file.
				 * Also deal with permission denied elsewhere.
				 * Just drop out to done.
				 */
				goto done;
			}
		}
	} else {
		/*
		 * We have a wildcard in the pathname.
		 *
		 * Optimization for common case where the wildcard
		 * is in the last component and the client already
		 * sent the correct case.
		 */
		status = check_parent_exists(ctx,
					conn,
					posix_pathnames,
					smb_fname,
					&dirpath,
					&start);
		if (!NT_STATUS_IS_OK(status)) {
			goto fail;
		}
	}

	/*
	 * is_mangled() was changed to look at an entire pathname, not
	 * just a component. JRA.
	 */

	if (mangle_is_mangled(start, conn->params)) {
		component_was_mangled = True;
	}

	/*
	 * Now we need to recursively match the name against the real
	 * directory structure.
	 */

	/*
	 * Match each part of the path name separately, trying the names
	 * as is first, then trying to scan the directory for matching names.
	 */

	for (; start ; start = (end?end+1:(char *)NULL)) {
		/*
		 * Pinpoint the end of this section of the filename.
		 */
		/* mb safe. '/' can't be in any encoded char. */
		end = strchr(start, '/');

		/*
		 * Chop the name at this point.
		 */
		if (end) {
			*end = 0;
		}

		if (save_last_component) {
			TALLOC_FREE(smb_fname->original_lcomp);
			smb_fname->original_lcomp = talloc_strdup(smb_fname,
							end ? end + 1 : start);
			if (!smb_fname->original_lcomp) {
				DEBUG(0, ("talloc failed\n"));
				status = NT_STATUS_NO_MEMORY;
				goto err;
			}
		}

		/* The name cannot have a component of "." */

		if (ISDOT(start)) {
			if (!end)  {
				/* Error code at the end of a pathname. */
				status = NT_STATUS_OBJECT_NAME_INVALID;
			} else {
				status = determine_path_error(end+1,
						allow_wcard_last_component);
			}
			goto fail;
		}

		/* The name cannot have a wildcard if it's not
		   the last component. */

		name_has_wildcard = ms_has_wild(start);

		/* Wildcards never valid within a pathname. */
		if (name_has_wildcard && end) {
			status = NT_STATUS_OBJECT_NAME_INVALID;
			goto fail;
		}

		/* Skip the stat call if it's a wildcard end. */
		if (name_has_wildcard) {
			DEBUG(5,("Wildcard %s\n",start));
			goto done;
		}

		/*
		 * Check if the name exists up to this point.
		 */

		if (posix_pathnames) {
			ret = SMB_VFS_LSTAT(conn, smb_fname);
		} else {
			ret = SMB_VFS_STAT(conn, smb_fname);
		}

		if (ret == 0) {
			/*
			 * It exists. it must either be a directory or this must
			 * be the last part of the path for it to be OK.
			 */
			if (end && !S_ISDIR(smb_fname->st.st_ex_mode)) {
				/*
				 * An intermediate part of the name isn't
				 * a directory.
				 */
				DEBUG(5,("Not a dir %s\n",start));
				*end = '/';
				/*
				 * We need to return the fact that the
				 * intermediate name resolution failed. This
				 * is used to return an error of ERRbadpath
				 * rather than ERRbadfile. Some Windows
				 * applications depend on the difference between
				 * these two errors.
				 */
				status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
				goto fail;
			}

		} else {
			char *found_name = NULL;

			/* Stat failed - ensure we don't use it. */
			SET_STAT_INVALID(smb_fname->st);

			/*
			 * Reset errno so we can detect
			 * directory open errors.
			 */
			errno = 0;

			/*
			 * Try to find this part of the path in the directory.
			 */

			if (name_has_wildcard ||
			    (get_real_filename(conn, dirpath, start,
					       talloc_tos(),
					       &found_name) == -1)) {
				char *unmangled;

				if (end) {
					/*
					 * An intermediate part of the name
					 * can't be found.
					 */
					DEBUG(5,("Intermediate not found %s\n",
							start));
					*end = '/';

					/*
					 * We need to return the fact that the
					 * intermediate name resolution failed.
					 * This is used to return an error of
					 * ERRbadpath rather than ERRbadfile.
					 * Some Windows applications depend on
					 * the difference between these two
					 * errors.
					 */

					/*
					 * ENOENT, ENOTDIR and ELOOP all map
					 * to NT_STATUS_OBJECT_PATH_NOT_FOUND
					 * in the filename walk.
					 */

					if (errno == ENOENT ||
							errno == ENOTDIR ||
							errno == ELOOP) {
						status =
						NT_STATUS_OBJECT_PATH_NOT_FOUND;
					}
					else {
						status =
						map_nt_error_from_unix(errno);
					}
					goto fail;
				}

				/*
				 * ENOENT/EACCESS are the only valid errors
				 * here. EACCESS needs handling here for
				 * "dropboxes", i.e. directories where users
				 * can only put stuff with permission -wx.
				 */
				if ((errno != 0) && (errno != ENOENT)
				    && (errno != EACCES)) {
					/*
					 * ENOTDIR and ELOOP both map to
					 * NT_STATUS_OBJECT_PATH_NOT_FOUND
					 * in the filename walk.
					 */
					if (errno == ENOTDIR ||
							errno == ELOOP) {
						status =
						NT_STATUS_OBJECT_PATH_NOT_FOUND;
					} else {
						status =
						map_nt_error_from_unix(errno);
					}
					goto fail;
				}

				/*
				 * Just the last part of the name doesn't exist.
				 * We need to strupper() or strlower() it as
				 * this conversion may be used for file creation
				 * purposes. Fix inspired by
				 * Thomas Neumann <t.neumann@iku-ag.de>.
				 */
				if (!conn->case_preserve ||
				    (mangle_is_8_3(start, False,
						   conn->params) &&
						 !conn->short_case_preserve)) {
					strnorm(start,
						lp_defaultcase(SNUM(conn)));
				}

				/*
				 * check on the mangled stack to see if we can
				 * recover the base of the filename.
				 */

				if (mangle_is_mangled(start, conn->params)
				    && mangle_lookup_name_from_8_3(ctx,
					    		start,
							&unmangled,
							conn->params)) {
					char *tmp;
					size_t start_ofs =
					    start - smb_fname->base_name;

					if (*dirpath != '\0') {
						tmp = talloc_asprintf(
							smb_fname, "%s/%s",
							dirpath, unmangled);
						TALLOC_FREE(unmangled);
					}
					else {
						tmp = unmangled;
					}
					if (tmp == NULL) {
						DEBUG(0, ("talloc failed\n"));
						status = NT_STATUS_NO_MEMORY;
						goto err;
					}
					TALLOC_FREE(smb_fname->base_name);
					smb_fname->base_name = tmp;
					start =
					    smb_fname->base_name + start_ofs;
					end = start + strlen(start);
				}

				DEBUG(5,("New file %s\n",start));
				goto done;
			}


			/*
			 * Restore the rest of the string. If the string was
			 * mangled the size may have changed.
			 */
			if (end) {
				char *tmp;
				size_t start_ofs =
				    start - smb_fname->base_name;

				if (*dirpath != '\0') {
					tmp = talloc_asprintf(smb_fname,
						"%s/%s/%s", dirpath,
						found_name, end+1);
				}
				else {
					tmp = talloc_asprintf(smb_fname,
						"%s/%s", found_name,
						end+1);
				}
				if (tmp == NULL) {
					DEBUG(0, ("talloc_asprintf failed\n"));
					status = NT_STATUS_NO_MEMORY;
					goto err;
				}
				TALLOC_FREE(smb_fname->base_name);
				smb_fname->base_name = tmp;
				start = smb_fname->base_name + start_ofs;
				end = start + strlen(found_name);
				*end = '\0';
			} else {
				char *tmp;
				size_t start_ofs =
				    start - smb_fname->base_name;

				if (*dirpath != '\0') {
					tmp = talloc_asprintf(smb_fname,
						"%s/%s", dirpath,
						found_name);
				} else {
					tmp = talloc_strdup(smb_fname,
						found_name);
				}
				if (tmp == NULL) {
					DEBUG(0, ("talloc failed\n"));
					status = NT_STATUS_NO_MEMORY;
					goto err;
				}
				TALLOC_FREE(smb_fname->base_name);
				smb_fname->base_name = tmp;
				start = smb_fname->base_name + start_ofs;

				/*
				 * We just scanned for, and found the end of
				 * the path. We must return a valid stat struct
				 * if it exists. JRA.
				 */

				if (posix_pathnames) {
					ret = SMB_VFS_LSTAT(conn, smb_fname);
				} else {
					ret = SMB_VFS_STAT(conn, smb_fname);
				}

				if (ret != 0) {
					SET_STAT_INVALID(smb_fname->st);
				}
			}

			TALLOC_FREE(found_name);
		} /* end else */

#ifdef DEVELOPER
		/*
		 * This sucks!
		 * We should never provide different behaviors
		 * depending on DEVELOPER!!!
		 */
		if (VALID_STAT(smb_fname->st)) {
			bool delete_pending;
			uint32_t name_hash;

			status = file_name_hash(conn,
					smb_fname_str_dbg(smb_fname),
					&name_hash);
			if (!NT_STATUS_IS_OK(status)) {
				goto fail;
			}

			get_file_infos(vfs_file_id_from_sbuf(conn,
							     &smb_fname->st),
				       name_hash,
				       &delete_pending, NULL);
			if (delete_pending) {
				status = NT_STATUS_DELETE_PENDING;
				goto fail;
			}
		}
#endif

		/*
		 * Add to the dirpath that we have resolved so far.
		 */

		if (*dirpath != '\0') {
			char *tmp = talloc_asprintf(ctx,
					"%s/%s", dirpath, start);
			if (!tmp) {
				DEBUG(0, ("talloc_asprintf failed\n"));
				status = NT_STATUS_NO_MEMORY;
				goto err;
			}
			TALLOC_FREE(dirpath);
			dirpath = tmp;
		}
		else {
			TALLOC_FREE(dirpath);
			if (!(dirpath = talloc_strdup(ctx,start))) {
				DEBUG(0, ("talloc_strdup failed\n"));
				status = NT_STATUS_NO_MEMORY;
				goto err;
			}
		}

		/*
		 * Cache the dirpath thus far. Don't cache a name with mangled
		 * or wildcard components as this can change the size.
		 */
		if(!component_was_mangled && !name_has_wildcard) {
			stat_cache_add(orig_path, dirpath,
					conn->case_sensitive);
		}

		/*
		 * Restore the / that we wiped out earlier.
		 */
		if (end) {
			*end = '/';
		}
	}

	/*
	 * Cache the full path. Don't cache a name with mangled or wildcard
	 * components as this can change the size.
	 */

	if(!component_was_mangled && !name_has_wildcard) {
		stat_cache_add(orig_path, smb_fname->base_name,
			       conn->case_sensitive);
	}

	/*
	 * The name has been resolved.
	 */

	DEBUG(5,("conversion finished %s -> %s\n", orig_path,
		 smb_fname->base_name));

 done:
	/* Add back the stream if one was stripped off originally. */
	if (stream != NULL) {
		smb_fname->stream_name = stream;

		/* Check path now that the base_name has been converted. */
		status = build_stream_path(ctx, conn, orig_path, smb_fname);
		if (!NT_STATUS_IS_OK(status)) {
			goto fail;
		}
	}
	TALLOC_FREE(dirpath);
	*smb_fname_out = smb_fname;
	return NT_STATUS_OK;
 fail:
	DEBUG(10, ("dirpath = [%s] start = [%s]\n", dirpath, start));
	if (*dirpath != '\0') {
		smb_fname->base_name = talloc_asprintf(smb_fname, "%s/%s",
						       dirpath, start);
	} else {
		smb_fname->base_name = talloc_strdup(smb_fname, start);
	}
	if (!smb_fname->base_name) {
		DEBUG(0, ("talloc_asprintf failed\n"));
		status = NT_STATUS_NO_MEMORY;
		goto err;
	}

	*smb_fname_out = smb_fname;
	TALLOC_FREE(dirpath);
	return status;
 err:
	TALLOC_FREE(smb_fname);
	return status;
}

/****************************************************************************
 Check a filename - possibly calling check_reduced_name.
 This is called by every routine before it allows an operation on a filename.
 It does any final confirmation necessary to ensure that the filename is
 a valid one for the user to access.
****************************************************************************/

NTSTATUS check_name(connection_struct *conn, const char *name)
{
	if (IS_VETO_PATH(conn, name))  {
		/* Is it not dot or dot dot. */
		if (!((name[0] == '.') && (!name[1] ||
					(name[1] == '.' && !name[2])))) {
			DEBUG(5,("check_name: file path name %s vetoed\n",
						name));
			return map_nt_error_from_unix(ENOENT);
		}
	}

	if (!lp_widelinks(SNUM(conn)) || !lp_symlinks(SNUM(conn))) {
		NTSTATUS status = check_reduced_name(conn,name);
		if (!NT_STATUS_IS_OK(status)) {
			DEBUG(5,("check_name: name %s failed with %s\n",name,
						nt_errstr(status)));
			return status;
		}
	}

	return NT_STATUS_OK;
}

/****************************************************************************
 Check if two filenames are equal.
 This needs to be careful about whether we are case sensitive.
****************************************************************************/

static bool fname_equal(const char *name1, const char *name2,
		bool case_sensitive)
{
	/* Normal filename handling */
	if (case_sensitive) {
		return(strcmp(name1,name2) == 0);
	}

	return(strequal(name1,name2));
}

/****************************************************************************
 Scan a directory to find a filename, matching without case sensitivity.
 If the name looks like a mangled name then try via the mangling functions
****************************************************************************/

static int get_real_filename_full_scan(connection_struct *conn,
				       const char *path, const char *name,
				       bool mangled,
				       TALLOC_CTX *mem_ctx, char **found_name)
{
	struct smb_Dir *cur_dir;
	const char *dname = NULL;
	char *talloced = NULL;
	char *unmangled_name = NULL;
	long curpos;

	/* handle null paths */
	if ((path == NULL) || (*path == 0)) {
		path = ".";
	}

	/* If we have a case-sensitive filesystem, it doesn't do us any
	 * good to search for a name. If a case variation of the name was
	 * there, then the original stat(2) would have found it.
	 */
	if (!mangled && !(conn->fs_capabilities & FILE_CASE_SENSITIVE_SEARCH)) {
		errno = ENOENT;
		return -1;
	}

	/*
	 * The incoming name can be mangled, and if we de-mangle it
	 * here it will not compare correctly against the filename (name2)
	 * read from the directory and then mangled by the name_to_8_3()
	 * call. We need to mangle both names or neither.
	 * (JRA).
	 *
	 * Fix for bug found by Dina Fine. If in case sensitive mode then
	 * the mangle cache is no good (3 letter extension could be wrong
	 * case - so don't demangle in this case - leave as mangled and
	 * allow the mangling of the directory entry read (which is done
	 * case insensitively) to match instead. This will lead to more
	 * false positive matches but we fail completely without it. JRA.
	 */

	if (mangled && !conn->case_sensitive) {
		mangled = !mangle_lookup_name_from_8_3(talloc_tos(), name,
						       &unmangled_name,
						       conn->params);
		if (!mangled) {
			/* Name is now unmangled. */
			name = unmangled_name;
		}
	}

	/* open the directory */
	if (!(cur_dir = OpenDir(talloc_tos(), conn, path, NULL, 0))) {
		DEBUG(3,("scan dir didn't open dir [%s]\n",path));
		TALLOC_FREE(unmangled_name);
		return -1;
	}

	/* now scan for matching names */
	curpos = 0;
	while ((dname = ReadDirName(cur_dir, &curpos, NULL, &talloced))) {

		/* Is it dot or dot dot. */
		if (ISDOT(dname) || ISDOTDOT(dname)) {
			TALLOC_FREE(talloced);
			continue;
		}

		/*
		 * At this point dname is the unmangled name.
		 * name is either mangled or not, depending on the state
		 * of the "mangled" variable. JRA.
		 */

		/*
		 * Check mangled name against mangled name, or unmangled name
		 * against unmangled name.
		 */

		if ((mangled && mangled_equal(name,dname,conn->params)) ||
			fname_equal(name, dname, conn->case_sensitive)) {
			/* we've found the file, change it's name and return */
			*found_name = talloc_strdup(mem_ctx, dname);
			TALLOC_FREE(unmangled_name);
			TALLOC_FREE(cur_dir);
			if (!*found_name) {
				errno = ENOMEM;
				TALLOC_FREE(talloced);
				return -1;
			}
			TALLOC_FREE(talloced);
			return 0;
		}
		TALLOC_FREE(talloced);
	}

	TALLOC_FREE(unmangled_name);
	TALLOC_FREE(cur_dir);
	errno = ENOENT;
	return -1;
}

/****************************************************************************
 Wrapper around the vfs get_real_filename and the full directory scan
 fallback.
****************************************************************************/

int get_real_filename(connection_struct *conn, const char *path,
		      const char *name, TALLOC_CTX *mem_ctx,
		      char **found_name)
{
	int ret;
	bool mangled;

	mangled = mangle_is_mangled(name, conn->params);

	if (mangled) {
		return get_real_filename_full_scan(conn, path, name, mangled,
						   mem_ctx, found_name);
	}

	/* Try the vfs first to take advantage of case-insensitive stat. */
	ret = SMB_VFS_GET_REAL_FILENAME(conn, path, name, mem_ctx, found_name);

	/*
	 * If the case-insensitive stat was successful, or returned an error
	 * other than EOPNOTSUPP then there is no need to fall back on the
	 * full directory scan.
	 */
	if (ret == 0 || (ret == -1 && errno != EOPNOTSUPP)) {
		return ret;
	}

	return get_real_filename_full_scan(conn, path, name, mangled, mem_ctx,
					   found_name);
}

static NTSTATUS build_stream_path(TALLOC_CTX *mem_ctx,
				  connection_struct *conn,
				  const char *orig_path,
				  struct smb_filename *smb_fname)
{
	NTSTATUS status;
	unsigned int i, num_streams;
	struct stream_struct *streams = NULL;

	if (SMB_VFS_STAT(conn, smb_fname) == 0) {
		DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
		return NT_STATUS_OK;
	}

	if (errno != ENOENT) {
		DEBUG(10, ("vfs_stat failed: %s\n", strerror(errno)));
		status = map_nt_error_from_unix(errno);
		goto fail;
	}

	/* Fall back to a case-insensitive scan of all streams on the file. */
	status = SMB_VFS_STREAMINFO(conn, NULL, smb_fname->base_name, mem_ctx,
				    &num_streams, &streams);

	if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
		SET_STAT_INVALID(smb_fname->st);
		return NT_STATUS_OK;
	}

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

	for (i=0; i<num_streams; i++) {
		DEBUG(10, ("comparing [%s] and [%s]: ",
			   smb_fname->stream_name, streams[i].name));
		if (fname_equal(smb_fname->stream_name, streams[i].name,
				conn->case_sensitive)) {
			DEBUGADD(10, ("equal\n"));
			break;
		}
		DEBUGADD(10, ("not equal\n"));
	}

	/* Couldn't find the stream. */
	if (i == num_streams) {
		SET_STAT_INVALID(smb_fname->st);
		TALLOC_FREE(streams);
		return NT_STATUS_OK;
	}

	DEBUG(10, ("case insensitive stream. requested: %s, actual: %s\n",
		smb_fname->stream_name, streams[i].name));


	TALLOC_FREE(smb_fname->stream_name);
	smb_fname->stream_name = talloc_strdup(smb_fname, streams[i].name);
	if (smb_fname->stream_name == NULL) {
		status = NT_STATUS_NO_MEMORY;
		goto fail;
	}

	SET_STAT_INVALID(smb_fname->st);

	if (SMB_VFS_STAT(conn, smb_fname) == 0) {
		DEBUG(10, ("'%s' exists\n", smb_fname_str_dbg(smb_fname)));
	}
	status = NT_STATUS_OK;
 fail:
	TALLOC_FREE(streams);
	return status;
}

/**
 * Go through all the steps to validate a filename.
 *
 * @param ctx		talloc_ctx to allocate memory with.
 * @param conn		connection struct for vfs calls.
 * @param dfs_path	Whether this path requires dfs resolution.
 * @param name_in	The unconverted name.
 * @param ucf_flags	flags to pass through to unix_convert().
 *			UCF_ALWAYS_ALLOW_WCARD_LCOMP will be OR'd in if
 *			p_cont_wcard != NULL and is true and
 *			UCF_COND_ALLOW_WCARD_LCOMP.
 * @param p_cont_wcard	If not NULL, will be set to true if the dfs path
 *			resolution detects a wildcard.
 * @param pp_smb_fname	The final converted name will be allocated if the
 *			return is NT_STATUS_OK.
 *
 * @return NT_STATUS_OK if all operations completed succesfully, appropriate
 * 	   error otherwise.
 */
NTSTATUS filename_convert(TALLOC_CTX *ctx,
				connection_struct *conn,
				bool dfs_path,
				const char *name_in,
				uint32_t ucf_flags,
				bool *ppath_contains_wcard,
				struct smb_filename **pp_smb_fname)
{
	NTSTATUS status;
	bool allow_wcards = (ucf_flags & (UCF_COND_ALLOW_WCARD_LCOMP|UCF_ALWAYS_ALLOW_WCARD_LCOMP));
	char *fname = NULL;

	*pp_smb_fname = NULL;

	status = resolve_dfspath_wcard(ctx, conn,
				dfs_path,
				name_in,
				allow_wcards,
				&fname,
				ppath_contains_wcard);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10,("filename_convert: resolve_dfspath failed "
			"for name %s with %s\n",
			name_in,
			nt_errstr(status) ));
		return status;
	}

	if (is_fake_file_path(name_in)) {
		SMB_STRUCT_STAT st;
		ZERO_STRUCT(st);
		st.st_ex_nlink = 1;
		status = create_synthetic_smb_fname_split(ctx,
							  name_in,
							  &st,
							  pp_smb_fname);
		return status;
	}

	/*
	 * If the caller conditionally allows wildcard lookups, only add the
	 * always allow if the path actually does contain a wildcard.
	 */
	if (ucf_flags & UCF_COND_ALLOW_WCARD_LCOMP &&
	    ppath_contains_wcard != NULL && *ppath_contains_wcard) {
		ucf_flags |= UCF_ALWAYS_ALLOW_WCARD_LCOMP;
	}

	status = unix_convert(ctx, conn, fname, pp_smb_fname, ucf_flags);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10,("filename_convert: unix_convert failed "
			"for name %s with %s\n",
			fname,
			nt_errstr(status) ));
		return status;
	}

	status = check_name(conn, (*pp_smb_fname)->base_name);
	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(3,("filename_convert: check_name failed "
			"for name %s with %s\n",
			smb_fname_str_dbg(*pp_smb_fname),
			nt_errstr(status) ));
		TALLOC_FREE(*pp_smb_fname);
		return status;
	}

	return status;
}