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 2 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, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 this is the core code for converting a filename from the format as
25 given by a client to a posix filename, including any case-matching
26 required, and checks for legal characters
30 #include "include/includes.h"
31 #include "vfs_posix.h"
34 compare two filename components. This is where the name mangling hook will go
36 static int component_compare(struct pvfs_state *pvfs, const char *comp, const char *name)
40 ret = StrCaseCmp(comp, name);
43 char *shortname = pvfs_short_name_component(pvfs, name);
45 ret = StrCaseCmp(comp, shortname);
46 talloc_free(shortname);
54 search for a filename in a case insensitive fashion
56 TODO: add a cache for previously resolved case-insensitive names
57 TODO: add mangled name support
59 static NTSTATUS pvfs_case_search(struct pvfs_state *pvfs, struct pvfs_filename *name)
61 /* break into a series of components */
64 char *p, *partial_name;
67 /* break up the full name info pathname components */
69 p = name->full_name + strlen(pvfs->base_directory) + 1;
77 components = talloc_array_p(name, char *, num_components);
78 p = name->full_name + strlen(pvfs->base_directory);
81 components[0] = name->full_name;
83 for (i=1;i<num_components;i++) {
87 if (pvfs_is_reserved_name(pvfs, components[i])) {
88 return NT_STATUS_ACCESS_DENIED;
92 partial_name = talloc_strdup(name, components[0]);
94 return NT_STATUS_NO_MEMORY;
97 /* for each component, check if it exists as-is, and if not then
98 do a directory scan */
99 for (i=1;i<num_components;i++) {
103 char *long_component;
105 /* possibly remap from the short name cache */
106 long_component = pvfs_mangled_lookup(pvfs, name, components[i]);
107 if (long_component) {
108 components[i] = long_component;
111 test_name = talloc_asprintf(name, "%s/%s", partial_name, components[i]);
113 return NT_STATUS_NO_MEMORY;
116 /* check if this component exists as-is */
117 if (stat(test_name, &name->st) == 0) {
118 if (i<num_components-1 && !S_ISDIR(name->st.st_mode)) {
119 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
121 talloc_free(partial_name);
122 partial_name = test_name;
123 if (i == num_components - 1) {
129 /* the filesystem might be case insensitive, in which
130 case a search is pointless unless the name is
132 if ((pvfs->flags & PVFS_FLAG_CI_FILESYSTEM) &&
133 !pvfs_is_mangled_component(pvfs, components[i])) {
134 if (i < num_components-1) {
135 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
137 partial_name = test_name;
141 dir = opendir(partial_name);
143 return pvfs_map_errno(pvfs, errno);
146 while ((de = readdir(dir))) {
147 if (component_compare(pvfs, components[i], de->d_name) == 0) {
153 if (i < num_components-1) {
155 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
158 components[i] = talloc_strdup(name, de->d_name);
160 test_name = talloc_asprintf(name, "%s/%s", partial_name, components[i]);
161 talloc_free(partial_name);
162 partial_name = test_name;
168 if (stat(partial_name, &name->st) == 0) {
173 talloc_free(name->full_name);
174 name->full_name = partial_name;
177 return pvfs_fill_dos_info(pvfs, name);
185 convert a CIFS pathname to a unix pathname. Note that this does NOT
186 take into account case insensitivity, and in fact does not access
187 the filesystem at all. It is merely a reformatting and charset
190 errors are returned if the filename is illegal given the flags
192 static NTSTATUS pvfs_unix_path(struct pvfs_state *pvfs, const char *cifs_name,
193 uint_t flags, struct pvfs_filename *name)
195 char *ret, *p, *p_start;
197 name->original_name = talloc_strdup(name, cifs_name);
198 name->stream_name = NULL;
199 name->has_wildcard = False;
201 while (*cifs_name == '\\') {
205 if (*cifs_name == 0) {
206 name->full_name = talloc_asprintf(name, "%s/.", pvfs->base_directory);
207 if (name->full_name == NULL) {
208 return NT_STATUS_NO_MEMORY;
213 ret = talloc_asprintf(name, "%s/%s", pvfs->base_directory, cifs_name);
215 return NT_STATUS_NO_MEMORY;
218 p = ret + strlen(pvfs->base_directory) + 1;
220 /* now do an in-place conversion of '\' to '/', checking
221 for legal characters */
226 codepoint_t c = next_codepoint(p, &c_size);
229 if (name->has_wildcard) {
230 /* wildcards are only allowed in the last part
232 return NT_STATUS_ILLEGAL_CHARACTER;
234 if (p > p_start && p[1] == 0) {
241 if (!(flags & PVFS_RESOLVE_STREAMS)) {
242 return NT_STATUS_ILLEGAL_CHARACTER;
244 name->stream_name = talloc_strdup(name, p+1);
245 if (name->stream_name == NULL) {
246 return NT_STATUS_NO_MEMORY;
255 if (flags & PVFS_RESOLVE_NO_WILDCARD) {
256 return NT_STATUS_OBJECT_NAME_INVALID;
258 name->has_wildcard = True;
262 return NT_STATUS_ILLEGAL_CHARACTER;
264 /* see if it is definately a .. or
265 . component. If it is then fail here, and
266 let the next layer up try again after
267 pvfs_reduce_name() if it wants to. This is
268 much more efficient on average than always
269 scanning for these separately */
271 (p[2] == 0 || p[2] == '\\') &&
272 (p == p_start || p[-1] == '/')) {
273 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD;
275 if ((p[1] == 0 || p[1] == '\\') &&
276 (p == p_start || p[-1] == '/')) {
277 return NT_STATUS_OBJECT_PATH_SYNTAX_BAD;
285 name->full_name = ret;
292 reduce a name that contains .. components or repeated \ separators
293 return NULL if it can't be reduced
295 static NTSTATUS pvfs_reduce_name(TALLOC_CTX *mem_ctx, const char **fname, uint_t flags)
299 int i, num_components, err_count;
303 s = talloc_strdup(mem_ctx, *fname);
304 if (s == NULL) return NT_STATUS_NO_MEMORY;
306 for (num_components=1, p=s; *p; p += c_size) {
307 c = next_codepoint(p, &c_size);
308 if (c == '\\') num_components++;
311 components = talloc_array_p(s, char *, num_components+1);
312 if (components == NULL) {
314 return NT_STATUS_NO_MEMORY;
318 for (i=0, p=s; *p; p += c_size) {
319 c = next_codepoint(p, &c_size);
322 components[++i] = p+1;
325 components[i+1] = NULL;
330 '.' components are not allowed, but the rules for what error
331 code to give don't seem to make sense. This is a close
334 for (err_count=i=0;components[i];i++) {
335 if (strcmp(components[i], "") == 0) {
338 if (strcmp(components[i], ".") == 0 || err_count) {
343 if (!(flags & PVFS_RESOLVE_NO_WILDCARD)) err_count--;
346 return NT_STATUS_OBJECT_NAME_INVALID;
348 return NT_STATUS_OBJECT_PATH_NOT_FOUND;
352 /* remove any null components */
353 for (i=0;components[i];i++) {
354 if (strcmp(components[i], "") == 0) {
355 memmove(&components[i], &components[i+1],
356 sizeof(char *)*(num_components-i));
359 if (strcmp(components[i], "..") == 0) {
360 if (i < 1) return NT_STATUS_OBJECT_PATH_SYNTAX_BAD;
361 memmove(&components[i-1], &components[i+1],
362 sizeof(char *)*(num_components-(i+1)));
367 if (components[0] == NULL) {
369 *fname = talloc_strdup(mem_ctx, "\\");
373 for (len=i=0;components[i];i++) {
374 len += strlen(components[i]) + 1;
377 /* rebuild the name */
378 ret = talloc(mem_ctx, len+1);
381 return NT_STATUS_NO_MEMORY;
384 for (len=0,i=0;components[i];i++) {
385 size_t len1 = strlen(components[i]);
387 memcpy(ret+len+1, components[i], len1);
401 resolve a name from relative client format to a struct pvfs_filename
402 the memory for the filename is made as a talloc child of 'name'
405 PVFS_RESOLVE_NO_WILDCARD = wildcards are considered illegal characters
406 PVFS_RESOLVE_STREAMS = stream names are allowed
408 TODO: ../ collapsing, and outside share checking
410 NTSTATUS pvfs_resolve_name(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx,
411 const char *cifs_name,
412 uint_t flags, struct pvfs_filename **name)
416 *name = talloc_p(mem_ctx, struct pvfs_filename);
418 return NT_STATUS_NO_MEMORY;
421 (*name)->exists = False;
423 /* do the basic conversion to a unix formatted path,
424 also checking for allowable characters */
425 status = pvfs_unix_path(pvfs, cifs_name, flags, *name);
427 if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_PATH_SYNTAX_BAD)) {
428 /* it might contain .. components which need to be reduced */
429 status = pvfs_reduce_name(*name, &cifs_name, flags);
430 if (!NT_STATUS_IS_OK(status)) {
433 status = pvfs_unix_path(pvfs, cifs_name, flags, *name);
436 if (!NT_STATUS_IS_OK(status)) {
440 /* if it has a wildcard then no point doing a stat() */
441 if ((*name)->has_wildcard) {
445 /* if we can stat() the full name now then we are done */
446 if (stat((*name)->full_name, &(*name)->st) == 0) {
447 (*name)->exists = True;
448 return pvfs_fill_dos_info(pvfs, *name);
451 /* search for a matching filename */
452 status = pvfs_case_search(pvfs, *name);
459 do a partial resolve, returning a pvfs_filename structure given a
460 base path and a relative component. It is an error if the file does
461 not exist. No case-insensitive matching is done.
463 this is used in places like directory searching where we need a pvfs_filename
464 to pass to a function, but already know the unix base directory and component
466 NTSTATUS pvfs_resolve_partial(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx,
467 const char *unix_dir, const char *fname,
468 struct pvfs_filename **name)
472 *name = talloc_p(mem_ctx, struct pvfs_filename);
474 return NT_STATUS_NO_MEMORY;
477 (*name)->full_name = talloc_asprintf(*name, "%s/%s", unix_dir, fname);
478 if ((*name)->full_name == NULL) {
479 return NT_STATUS_NO_MEMORY;
482 if (stat((*name)->full_name, &(*name)->st) == -1) {
483 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
486 (*name)->exists = True;
487 (*name)->has_wildcard = False;
488 (*name)->original_name = talloc_strdup(*name, fname);
489 (*name)->stream_name = NULL;
491 status = pvfs_fill_dos_info(pvfs, *name);
498 fill in the pvfs_filename info for an open file, given the current
499 info for a (possibly) non-open file. This is used by places that need
500 to update the pvfs_filename stat information, and by pvfs_open()
502 NTSTATUS pvfs_resolve_name_fd(struct pvfs_state *pvfs, int fd,
503 struct pvfs_filename *name)
509 device = name->st.st_dev;
510 inode = name->st.st_ino;
513 if (name->dos.attrib & FILE_ATTRIBUTE_DIRECTORY) {
514 if (stat(name->full_name, &name->st) == -1) {
515 return NT_STATUS_INVALID_HANDLE;
518 if (fstat(fd, &name->st) == -1) {
519 return NT_STATUS_INVALID_HANDLE;
524 (device != name->st.st_dev || inode != name->st.st_ino)) {
525 /* the file we are looking at has changed! this could
526 be someone trying to exploit a race
527 condition. Certainly we don't want to continue
528 operating on this file */
529 DEBUG(0,("pvfs: WARNING: file '%s' changed during resole - failing\n",
531 return NT_STATUS_UNEXPECTED_IO_ERROR;
536 return pvfs_fill_dos_info(pvfs, name);