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_NOT_A_DIRECTORY;
121 talloc_free(partial_name);
122 partial_name = test_name;
123 if (i == num_components - 1) {
129 dir = opendir(partial_name);
131 return pvfs_map_errno(pvfs, errno);
134 while ((de = readdir(dir))) {
135 if (component_compare(pvfs, components[i], de->d_name) == 0) {
141 if (i < num_components-1) {
143 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
146 components[i] = talloc_strdup(name, de->d_name);
148 test_name = talloc_asprintf(name, "%s/%s", partial_name, components[i]);
149 talloc_free(partial_name);
150 partial_name = test_name;
156 if (stat(partial_name, &name->st) == 0) {
161 talloc_free(name->full_name);
162 name->full_name = partial_name;
165 return pvfs_fill_dos_info(pvfs, name);
173 convert a CIFS pathname to a unix pathname. Note that this does NOT
174 take into account case insensitivity, and in fact does not access
175 the filesystem at all. It is merely a reformatting and charset
178 errors are returned if the filename is illegal given the flags
180 static NTSTATUS pvfs_unix_path(struct pvfs_state *pvfs, const char *cifs_name,
181 uint_t flags, struct pvfs_filename *name)
186 name->original_name = talloc_strdup(name, cifs_name);
187 name->stream_name = NULL;
188 name->has_wildcard = False;
190 while (*cifs_name == '\\') {
194 if (*cifs_name == 0) {
195 name->full_name = talloc_asprintf(name, "%s/.", pvfs->base_directory);
196 if (name->full_name == NULL) {
197 return NT_STATUS_NO_MEMORY;
202 ret = talloc_asprintf(name, "%s/%s", pvfs->base_directory, cifs_name);
204 return NT_STATUS_NO_MEMORY;
207 p = ret + strlen(pvfs->base_directory) + 1;
209 len = strlen(cifs_name);
210 if (len>0 && p[len-1] == '\\') {
214 if (len>1 && p[len-1] == '.' && p[len-2] == '\\') {
215 return NT_STATUS_OBJECT_NAME_INVALID;
218 /* now do an in-place conversion of '\' to '/', checking
219 for legal characters */
222 codepoint_t c = next_codepoint(p, &c_size);
225 if (name->has_wildcard) {
226 /* wildcards are only allowed in the last part
228 return NT_STATUS_ILLEGAL_CHARACTER;
233 if (!(flags & PVFS_RESOLVE_STREAMS)) {
234 return NT_STATUS_ILLEGAL_CHARACTER;
236 name->stream_name = talloc_strdup(name, p+1);
237 if (name->stream_name == NULL) {
238 return NT_STATUS_NO_MEMORY;
247 if (flags & PVFS_RESOLVE_NO_WILDCARD) {
248 return NT_STATUS_ILLEGAL_CHARACTER;
250 name->has_wildcard = True;
254 return NT_STATUS_ILLEGAL_CHARACTER;
260 name->full_name = ret;
267 resolve a name from relative client format to a struct pvfs_filename
268 the memory for the filename is made as a talloc child of 'name'
271 PVFS_RESOLVE_NO_WILDCARD = wildcards are considered illegal characters
272 PVFS_RESOLVE_STREAMS = stream names are allowed
274 TODO: add reserved name checking (for things like LPT1)
275 TODO: ../ collapsing, and outside share checking
277 NTSTATUS pvfs_resolve_name(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx,
278 const char *cifs_name,
279 uint_t flags, struct pvfs_filename **name)
283 *name = talloc_p(mem_ctx, struct pvfs_filename);
285 return NT_STATUS_NO_MEMORY;
288 (*name)->exists = False;
290 /* do the basic conversion to a unix formatted path,
291 also checking for allowable characters */
292 status = pvfs_unix_path(pvfs, cifs_name, flags, *name);
293 if (!NT_STATUS_IS_OK(status)) {
297 /* if it has a wildcard then no point doing a stat() */
298 if ((*name)->has_wildcard) {
302 /* if we can stat() the full name now then we are done */
303 if (stat((*name)->full_name, &(*name)->st) == 0) {
304 (*name)->exists = True;
305 return pvfs_fill_dos_info(pvfs, *name);
308 /* the filesystem might be case insensitive, in which
309 case a search is pointless */
310 if (pvfs->flags & PVFS_FLAG_CI_FILESYSTEM) {
314 /* search for a matching filename */
315 status = pvfs_case_search(pvfs, *name);
322 do a partial resolve, returning a pvfs_filename structure given a
323 base path and a relative component. It is an error if the file does
324 not exist. No case-insensitive matching is done.
326 this is used in places like directory searching where we need a pvfs_filename
327 to pass to a function, but already know the unix base directory and component
329 NTSTATUS pvfs_resolve_partial(struct pvfs_state *pvfs, TALLOC_CTX *mem_ctx,
330 const char *unix_dir, const char *fname,
331 struct pvfs_filename **name)
335 *name = talloc_p(mem_ctx, struct pvfs_filename);
337 return NT_STATUS_NO_MEMORY;
340 (*name)->full_name = talloc_asprintf(*name, "%s/%s", unix_dir, fname);
341 if ((*name)->full_name == NULL) {
342 return NT_STATUS_NO_MEMORY;
345 if (stat((*name)->full_name, &(*name)->st) == -1) {
346 return NT_STATUS_OBJECT_NAME_NOT_FOUND;
349 (*name)->exists = True;
350 (*name)->has_wildcard = False;
351 (*name)->original_name = talloc_strdup(*name, fname);
352 (*name)->stream_name = NULL;
354 status = pvfs_fill_dos_info(pvfs, *name);
361 fill in the pvfs_filename info for an open file, given the current
362 info for a (possibly) non-open file. This is used by places that need
363 to update the pvfs_filename stat information, and by pvfs_open()
365 NTSTATUS pvfs_resolve_name_fd(struct pvfs_state *pvfs, int fd,
366 struct pvfs_filename *name)
368 if (fstat(fd, &name->st) == -1) {
369 return NT_STATUS_INVALID_HANDLE;
374 return pvfs_fill_dos_info(pvfs, name);