2 Unix SMB/CIFS implementation.
4 POSIX NTVFS backend - filename resolution
6 Copyright (C) Andrew Tridgell 2004
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 this is the core code for converting a filename from the format as
24 given by a client to a posix filename, including any case-matching
25 required, and checks for legal characters
30 #include "vfs_posix.h"
31 #include "system/dir.h"
32 #include "param/param.h"
35 compare two filename components. This is where the name mangling hook will go
37 static int component_compare(struct pvfs_state
*pvfs
, const char *comp
, const char *name
)
41 ret
= strcasecmp_m(comp
, name
);
44 char *shortname
= pvfs_short_name_component(pvfs
, name
);
46 ret
= strcasecmp_m(comp
, shortname
);
47 talloc_free(shortname
);
55 search for a filename in a case insensitive fashion
57 TODO: add a cache for previously resolved case-insensitive names
58 TODO: add mangled name support
60 static NTSTATUS
pvfs_case_search(struct pvfs_state
*pvfs
,
61 struct pvfs_filename
*name
,
64 /* break into a series of components */
67 char *p
, *partial_name
;
70 /* break up the full name info pathname components */
72 p
= name
->full_name
+ strlen(pvfs
->base_directory
) + 1;
80 components
= talloc_array(name
, char *, num_components
);
81 p
= name
->full_name
+ strlen(pvfs
->base_directory
);
84 components
[0] = name
->full_name
;
86 for (i
=1;i
<num_components
;i
++) {
90 if (pvfs_is_reserved_name(pvfs
, components
[i
])) {
91 return NT_STATUS_ACCESS_DENIED
;
95 partial_name
= talloc_strdup(name
, components
[0]);
97 return NT_STATUS_NO_MEMORY
;
100 /* for each component, check if it exists as-is, and if not then
101 do a directory scan */
102 for (i
=1;i
<num_components
;i
++) {
106 char *long_component
;
108 /* possibly remap from the short name cache */
109 long_component
= pvfs_mangled_lookup(pvfs
, name
, components
[i
]);
110 if (long_component
) {
111 components
[i
] = long_component
;
114 test_name
= talloc_asprintf(name
, "%s/%s", partial_name
, components
[i
]);
116 return NT_STATUS_NO_MEMORY
;
119 /* check if this component exists as-is */
120 if (stat(test_name
, &name
->st
) == 0) {
121 if (i
<num_components
-1 && !S_ISDIR(name
->st
.st_mode
)) {
122 return NT_STATUS_OBJECT_PATH_NOT_FOUND
;
124 talloc_free(partial_name
);
125 partial_name
= test_name
;
126 if (i
== num_components
- 1) {
132 /* the filesystem might be case insensitive, in which
133 case a search is pointless unless the name is
135 if ((pvfs
->flags
& PVFS_FLAG_CI_FILESYSTEM
) &&
136 !pvfs_is_mangled_component(pvfs
, components
[i
])) {
137 if (i
< num_components
-1) {
138 return NT_STATUS_OBJECT_PATH_NOT_FOUND
;
140 partial_name
= test_name
;
144 dir
= opendir(partial_name
);
146 return pvfs_map_errno(pvfs
, errno
);
149 while ((de
= readdir(dir
))) {
150 if (component_compare(pvfs
, components
[i
], de
->d_name
) == 0) {
156 if (i
< num_components
-1) {
158 return NT_STATUS_OBJECT_PATH_NOT_FOUND
;
161 components
[i
] = talloc_strdup(name
, de
->d_name
);
163 test_name
= talloc_asprintf(name
, "%s/%s", partial_name
, components
[i
]);
164 talloc_free(partial_name
);
165 partial_name
= test_name
;
171 if (stat(partial_name
, &name
->st
) == 0) {
176 talloc_free(name
->full_name
);
177 name
->full_name
= partial_name
;
180 return pvfs_fill_dos_info(pvfs
, name
, flags
, -1);
187 parse a alternate data stream name
189 static NTSTATUS
parse_stream_name(struct smb_iconv_convenience
*ic
,
190 struct pvfs_filename
*name
,
195 return NT_STATUS_OBJECT_NAME_INVALID
;
197 name
->stream_name
= talloc_strdup(name
, s
+1);
198 if (name
->stream_name
== NULL
) {
199 return NT_STATUS_NO_MEMORY
;
202 p
= name
->stream_name
;
206 codepoint_t c
= next_codepoint_convenience(ic
, p
, &c_size
);
211 return NT_STATUS_OBJECT_NAME_INVALID
;
216 return NT_STATUS_OBJECT_NAME_INVALID
;
218 if (strcasecmp_m(p
, "$DATA") != 0) {
219 if (strchr_m(p
, ':')) {
220 return NT_STATUS_OBJECT_NAME_INVALID
;
222 return NT_STATUS_INVALID_PARAMETER
;
232 if (strcmp(name
->stream_name
, "") == 0) {
234 * we don't set stream_name to NULL, here
235 * as this would be wrong for directories
237 * pvfs_fill_dos_info() will set it to NULL
238 * if it's not a directory.
242 name
->stream_id
= pvfs_name_hash(name
->stream_name
,
243 strlen(name
->stream_name
));
251 convert a CIFS pathname to a unix pathname. Note that this does NOT
252 take into account case insensitivity, and in fact does not access
253 the filesystem at all. It is merely a reformatting and charset
256 errors are returned if the filename is illegal given the flags
258 static NTSTATUS
pvfs_unix_path(struct pvfs_state
*pvfs
, const char *cifs_name
,
259 uint_t flags
, struct pvfs_filename
*name
)
261 char *ret
, *p
, *p_start
;
262 struct smb_iconv_convenience
*ic
= NULL
;
265 name
->original_name
= talloc_strdup(name
, cifs_name
);
266 name
->stream_name
= NULL
;
268 name
->has_wildcard
= false;
270 while (*cifs_name
== '\\') {
274 if (*cifs_name
== 0) {
275 name
->full_name
= talloc_asprintf(name
, "%s/.", pvfs
->base_directory
);
276 if (name
->full_name
== NULL
) {
277 return NT_STATUS_NO_MEMORY
;
282 ret
= talloc_asprintf(name
, "%s/%s", pvfs
->base_directory
, cifs_name
);
284 return NT_STATUS_NO_MEMORY
;
287 p
= ret
+ strlen(pvfs
->base_directory
) + 1;
289 /* now do an in-place conversion of '\' to '/', checking
290 for legal characters */
293 ic
= lp_iconv_convenience(pvfs
->ntvfs
->ctx
->lp_ctx
);
296 codepoint_t c
= next_codepoint_convenience(ic
, p
, &c_size
);
299 return NT_STATUS_OBJECT_NAME_INVALID
;
304 if (name
->has_wildcard
) {
305 /* wildcards are only allowed in the last part
307 return NT_STATUS_OBJECT_NAME_INVALID
;
309 if (p
> p_start
&& (p
[1] == '\\' || p
[1] == '\0')) {
310 /* see if it is definately a "\\" or
311 * a trailing "\". If it is then fail here,
312 * and let the next layer up try again after
313 * pvfs_reduce_name() if it wants to. This is
314 * much more efficient on average than always
315 * scanning for these separately
317 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD
;
323 if (!(flags
& PVFS_RESOLVE_STREAMS
)) {
324 return NT_STATUS_OBJECT_NAME_INVALID
;
326 if (name
->has_wildcard
) {
327 return NT_STATUS_OBJECT_NAME_INVALID
;
329 status
= parse_stream_name(ic
, name
, p
);
330 if (!NT_STATUS_IS_OK(status
)) {
340 if (!(flags
& PVFS_RESOLVE_WILDCARD
)) {
341 return NT_STATUS_OBJECT_NAME_INVALID
;
343 name
->has_wildcard
= true;
347 return NT_STATUS_OBJECT_NAME_INVALID
;
349 /* see if it is definately a .. or
350 . component. If it is then fail here, and
351 let the next layer up try again after
352 pvfs_reduce_name() if it wants to. This is
353 much more efficient on average than always
354 scanning for these separately */
356 (p
[2] == 0 || p
[2] == '\\') &&
357 (p
== p_start
|| p
[-1] == '/')) {
358 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD
;
360 if ((p
[1] == 0 || p
[1] == '\\') &&
361 (p
== p_start
|| p
[-1] == '/')) {
362 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD
;
370 name
->full_name
= ret
;
377 reduce a name that contains .. components or repeated \ separators
378 return NULL if it can't be reduced
380 static NTSTATUS
pvfs_reduce_name(TALLOC_CTX
*mem_ctx
,
381 struct smb_iconv_convenience
*iconv_convenience
,
382 const char **fname
, uint_t flags
)
386 int i
, num_components
, err_count
;
390 s
= talloc_strdup(mem_ctx
, *fname
);
391 if (s
== NULL
) return NT_STATUS_NO_MEMORY
;
393 for (num_components
=1, p
=s
; *p
; p
+= c_size
) {
394 c
= next_codepoint_convenience(iconv_convenience
, p
, &c_size
);
395 if (c
== '\\') num_components
++;
398 components
= talloc_array(s
, char *, num_components
+1);
399 if (components
== NULL
) {
401 return NT_STATUS_NO_MEMORY
;
405 for (i
=0, p
=s
; *p
; p
+= c_size
) {
406 c
= next_codepoint_convenience(iconv_convenience
, p
, &c_size
);
409 components
[++i
] = p
+1;
412 components
[i
+1] = NULL
;
417 '.' components are not allowed, but the rules for what error
418 code to give don't seem to make sense. This is a close
421 for (err_count
=i
=0;components
[i
];i
++) {
422 if (strcmp(components
[i
], "") == 0) {
425 if (ISDOT(components
[i
]) || err_count
) {
430 if (flags
& PVFS_RESOLVE_WILDCARD
) err_count
--;
433 return NT_STATUS_OBJECT_NAME_INVALID
;
435 return NT_STATUS_OBJECT_PATH_NOT_FOUND
;
439 /* remove any null components */
440 for (i
=0;components
[i
];i
++) {
441 if (strcmp(components
[i
], "") == 0) {
442 memmove(&components
[i
], &components
[i
+1],
443 sizeof(char *)*(num_components
-i
));
447 if (ISDOTDOT(components
[i
])) {
448 if (i
< 1) return NT_STATUS_OBJECT_PATH_SYNTAX_BAD
;
449 memmove(&components
[i
-1], &components
[i
+1],
450 sizeof(char *)*(num_components
-i
));
456 if (components
[0] == NULL
) {
458 *fname
= talloc_strdup(mem_ctx
, "\\");
462 for (len
=i
=0;components
[i
];i
++) {
463 len
+= strlen(components
[i
]) + 1;
466 /* rebuild the name */
467 ret
= talloc_size(mem_ctx
, len
+1);
470 return NT_STATUS_NO_MEMORY
;
473 for (len
=0,i
=0;components
[i
];i
++) {
474 size_t len1
= strlen(components
[i
]);
476 memcpy(ret
+len
+1, components
[i
], len1
);
490 resolve a name from relative client format to a struct pvfs_filename
491 the memory for the filename is made as a talloc child of 'name'
494 PVFS_RESOLVE_NO_WILDCARD = wildcards are considered illegal characters
495 PVFS_RESOLVE_STREAMS = stream names are allowed
497 TODO: ../ collapsing, and outside share checking
499 NTSTATUS
pvfs_resolve_name(struct pvfs_state
*pvfs
, TALLOC_CTX
*mem_ctx
,
500 const char *cifs_name
,
501 uint_t flags
, struct pvfs_filename
**name
)
505 *name
= talloc(mem_ctx
, struct pvfs_filename
);
507 return NT_STATUS_NO_MEMORY
;
510 (*name
)->exists
= false;
511 (*name
)->stream_exists
= false;
513 if (!(pvfs
->fs_attribs
& FS_ATTR_NAMED_STREAMS
)) {
514 flags
&= ~PVFS_RESOLVE_STREAMS
;
517 /* do the basic conversion to a unix formatted path,
518 also checking for allowable characters */
519 status
= pvfs_unix_path(pvfs
, cifs_name
, flags
, *name
);
521 if (NT_STATUS_EQUAL(status
, NT_STATUS_OBJECT_PATH_SYNTAX_BAD
)) {
522 /* it might contain .. components which need to be reduced */
523 status
= pvfs_reduce_name(*name
, lp_iconv_convenience(pvfs
->ntvfs
->ctx
->lp_ctx
), &cifs_name
, flags
);
524 if (!NT_STATUS_IS_OK(status
)) {
527 status
= pvfs_unix_path(pvfs
, cifs_name
, flags
, *name
);
530 if (!NT_STATUS_IS_OK(status
)) {
534 /* if it has a wildcard then no point doing a stat() of the
535 full name. Instead We need check if the directory exists
537 if ((*name
)->has_wildcard
) {
539 char *dir_name
, *saved_name
;
540 p
= strrchr((*name
)->full_name
, '/');
542 /* root directory wildcard is OK */
545 dir_name
= talloc_strndup(*name
, (*name
)->full_name
, (p
-(*name
)->full_name
));
546 if (stat(dir_name
, &(*name
)->st
) == 0) {
547 talloc_free(dir_name
);
550 /* we need to search for a matching name */
551 saved_name
= (*name
)->full_name
;
552 (*name
)->full_name
= dir_name
;
553 status
= pvfs_case_search(pvfs
, *name
, flags
);
554 if (!NT_STATUS_IS_OK(status
)) {
555 /* the directory doesn't exist */
556 (*name
)->full_name
= saved_name
;
559 /* it does exist, but might need a case change */
560 if (dir_name
!= (*name
)->full_name
) {
561 (*name
)->full_name
= talloc_asprintf(*name
, "%s%s",
562 (*name
)->full_name
, p
);
563 NT_STATUS_HAVE_NO_MEMORY((*name
)->full_name
);
565 (*name
)->full_name
= saved_name
;
566 talloc_free(dir_name
);
571 /* if we can stat() the full name now then we are done */
572 if (stat((*name
)->full_name
, &(*name
)->st
) == 0) {
573 (*name
)->exists
= true;
574 return pvfs_fill_dos_info(pvfs
, *name
, flags
, -1);
577 /* search for a matching filename */
578 status
= pvfs_case_search(pvfs
, *name
, flags
);
585 do a partial resolve, returning a pvfs_filename structure given a
586 base path and a relative component. It is an error if the file does
587 not exist. No case-insensitive matching is done.
589 this is used in places like directory searching where we need a pvfs_filename
590 to pass to a function, but already know the unix base directory and component
592 NTSTATUS
pvfs_resolve_partial(struct pvfs_state
*pvfs
, TALLOC_CTX
*mem_ctx
,
593 const char *unix_dir
, const char *fname
,
594 uint_t flags
, struct pvfs_filename
**name
)
598 *name
= talloc(mem_ctx
, struct pvfs_filename
);
600 return NT_STATUS_NO_MEMORY
;
603 (*name
)->full_name
= talloc_asprintf(*name
, "%s/%s", unix_dir
, fname
);
604 if ((*name
)->full_name
== NULL
) {
605 return NT_STATUS_NO_MEMORY
;
608 if (stat((*name
)->full_name
, &(*name
)->st
) == -1) {
609 return NT_STATUS_OBJECT_NAME_NOT_FOUND
;
612 (*name
)->exists
= true;
613 (*name
)->stream_exists
= true;
614 (*name
)->has_wildcard
= false;
615 (*name
)->original_name
= talloc_strdup(*name
, fname
);
616 (*name
)->stream_name
= NULL
;
617 (*name
)->stream_id
= 0;
619 status
= pvfs_fill_dos_info(pvfs
, *name
, flags
, -1);
626 fill in the pvfs_filename info for an open file, given the current
627 info for a (possibly) non-open file. This is used by places that need
628 to update the pvfs_filename stat information, and by pvfs_open()
630 NTSTATUS
pvfs_resolve_name_fd(struct pvfs_state
*pvfs
, int fd
,
631 struct pvfs_filename
*name
, uint_t flags
)
633 dev_t device
= (dev_t
)0;
637 device
= name
->st
.st_dev
;
638 inode
= name
->st
.st_ino
;
642 if (stat(name
->full_name
, &name
->st
) == -1) {
643 return NT_STATUS_INVALID_HANDLE
;
646 if (fstat(fd
, &name
->st
) == -1) {
647 return NT_STATUS_INVALID_HANDLE
;
652 (device
!= name
->st
.st_dev
|| inode
!= name
->st
.st_ino
)) {
653 /* the file we are looking at has changed! this could
654 be someone trying to exploit a race
655 condition. Certainly we don't want to continue
656 operating on this file */
657 DEBUG(0,("pvfs: WARNING: file '%s' changed during resolve - failing\n",
659 return NT_STATUS_UNEXPECTED_IO_ERROR
;
664 return pvfs_fill_dos_info(pvfs
, name
, flags
, fd
);
668 fill in the pvfs_filename info for an open file, given the current
669 info for a (possibly) non-open file. This is used by places that need
670 to update the pvfs_filename stat information, and the path
671 after a possible rename on a different handle.
673 NTSTATUS
pvfs_resolve_name_handle(struct pvfs_state
*pvfs
,
674 struct pvfs_file_handle
*h
)
678 if (h
->have_opendb_entry
) {
679 struct odb_lock
*lck
;
680 const char *name
= NULL
;
682 lck
= odb_lock(h
, h
->pvfs
->odb_context
, &h
->odb_locking_key
);
684 DEBUG(0,("%s: failed to lock file '%s' in opendb\n",
685 __FUNCTION__
, h
->name
->full_name
));
686 /* we were supposed to do a blocking lock, so something
688 return NT_STATUS_INTERNAL_DB_CORRUPTION
;
691 status
= odb_get_path(lck
, &name
);
692 if (NT_STATUS_IS_OK(status
)) {
694 * This relies an the fact that
695 * renames of open files are only
696 * allowed by setpathinfo() and setfileinfo()
697 * and there're only renames within the same
698 * directory supported
700 if (strcmp(h
->name
->full_name
, name
) != 0) {
701 const char *orig_dir
;
702 const char *new_file
;
703 const char *new_orig
;
706 delim
= strrchr(name
, '/');
709 return NT_STATUS_INTERNAL_ERROR
;
712 new_file
= delim
+ 1;
713 delim
= strrchr(h
->name
->original_name
, '\\');
716 orig_dir
= h
->name
->original_name
;
717 new_orig
= talloc_asprintf(h
->name
, "%s\\%s",
721 return NT_STATUS_NO_MEMORY
;
724 new_orig
= talloc_strdup(h
->name
, new_file
);
727 return NT_STATUS_NO_MEMORY
;
731 talloc_free(h
->name
->original_name
);
732 talloc_free(h
->name
->full_name
);
733 h
->name
->full_name
= talloc_steal(h
->name
, name
);
734 h
->name
->original_name
= new_orig
;
742 * TODO: pass PVFS_RESOLVE_NO_OPENDB and get
743 * the write time from odb_lock() above.
745 status
= pvfs_resolve_name_fd(pvfs
, h
->fd
, h
->name
, 0);
746 NT_STATUS_NOT_OK_RETURN(status
);
748 if (!null_nttime(h
->write_time
.close_time
)) {
749 h
->name
->dos
.write_time
= h
->write_time
.close_time
;
757 resolve the parent of a given name
759 NTSTATUS
pvfs_resolve_parent(struct pvfs_state
*pvfs
, TALLOC_CTX
*mem_ctx
,
760 const struct pvfs_filename
*child
,
761 struct pvfs_filename
**name
)
766 *name
= talloc(mem_ctx
, struct pvfs_filename
);
768 return NT_STATUS_NO_MEMORY
;
771 (*name
)->full_name
= talloc_strdup(*name
, child
->full_name
);
772 if ((*name
)->full_name
== NULL
) {
773 return NT_STATUS_NO_MEMORY
;
776 p
= strrchr_m((*name
)->full_name
, '/');
778 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD
;
781 /* this handles the root directory */
782 if (p
== (*name
)->full_name
) {
788 if (stat((*name
)->full_name
, &(*name
)->st
) == -1) {
789 return NT_STATUS_OBJECT_NAME_NOT_FOUND
;
792 (*name
)->exists
= true;
793 (*name
)->stream_exists
= true;
794 (*name
)->has_wildcard
= false;
795 /* we can't get the correct 'original_name', but for the purposes
796 of this call this is close enough */
797 (*name
)->original_name
= talloc_reference(*name
, child
->original_name
);
798 (*name
)->stream_name
= NULL
;
799 (*name
)->stream_id
= 0;
801 status
= pvfs_fill_dos_info(pvfs
, *name
, PVFS_RESOLVE_NO_OPENDB
, -1);