2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-2000
5 Copyright (C) Jeremy Allison 1999-2007
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2003
7 Copyright (C) Volker Lendecke 2007
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
25 #include "smbd/smbd.h"
27 #include "smbprofile.h"
29 /****************************************************************************
30 Stat cache code used in unix_convert.
31 *****************************************************************************/
34 * Add an entry into the stat cache.
36 * @param full_orig_name The original name as specified by the client
37 * @param orig_translated_path The name on our filesystem.
39 * @note Only the first strlen(orig_translated_path) characters are stored
40 * into the cache. This means that full_orig_name will be internally
45 void stat_cache_add( const char *full_orig_name,
46 char *translated_path,
49 size_t translated_path_length;
51 size_t original_path_length;
53 TALLOC_CTX *ctx = talloc_tos();
55 if (!lp_stat_cache()) {
60 * Don't cache trivial valid directory entries such as . and ..
63 if ((*full_orig_name == '\0')
64 || ISDOT(full_orig_name) || ISDOTDOT(full_orig_name)) {
69 * If we are in case insentive mode, we don't need to
70 * store names that need no translation - else, it
74 if (case_sensitive && (strcmp(full_orig_name, translated_path) == 0)) {
79 * Remove any trailing '/' characters from the
83 translated_path_length = strlen(translated_path);
85 if(translated_path[translated_path_length-1] == '/') {
86 translated_path_length--;
90 original_path = talloc_strdup(ctx,full_orig_name);
92 original_path = talloc_strdup_upper(ctx,full_orig_name);
99 original_path_length = strlen(original_path);
101 if(original_path[original_path_length-1] == '/') {
102 original_path[original_path_length-1] = '\0';
103 original_path_length--;
106 if (original_path_length != translated_path_length) {
107 if (original_path_length < translated_path_length) {
108 DEBUG(0, ("OOPS - tried to store stat cache entry "
109 "for weird length paths [%s] %lu and [%s] %lu)!\n",
111 (unsigned long)original_path_length,
113 (unsigned long)translated_path_length));
114 TALLOC_FREE(original_path);
118 /* we only want to index by the first part of original_path,
119 up to the length of translated_path */
121 original_path[translated_path_length] = '\0';
122 original_path_length = translated_path_length;
125 /* Ensure we're null terminated. */
126 saved_char = translated_path[translated_path_length];
127 translated_path[translated_path_length] = '\0';
130 * New entry or replace old entry.
134 smbd_memcache(), STAT_CACHE,
135 data_blob_const(original_path, original_path_length),
136 data_blob_const(translated_path, translated_path_length + 1));
138 DEBUG(5,("stat_cache_add: Added entry (%lx:size %x) %s -> %s\n",
139 (unsigned long)translated_path,
140 (unsigned int)translated_path_length,
144 translated_path[translated_path_length] = saved_char;
145 TALLOC_FREE(original_path);
149 * Look through the stat cache for an entry
151 * @param conn A connection struct to do the stat() with.
152 * @param name The path we are attempting to cache, modified by this routine
153 * to be correct as far as the cache can tell us. We assume that
154 * it is a talloc'ed string from top of stack, we free it if
156 * @param dirpath The path as far as the stat cache told us. Also talloced
158 * @param start A pointer into name, for where to 'start' in fixing the rest
160 * @param psd A stat buffer, NOT from the cache, but just a side-effect.
162 * @return True if we translated (and did a scuccessful stat on) the entire
167 bool stat_cache_lookup(connection_struct *conn,
171 SMB_STRUCT_STAT *pst)
175 bool sizechanged = False;
176 unsigned int num_components = 0;
177 char *translated_path;
178 size_t translated_path_length;
181 TALLOC_CTX *ctx = talloc_tos();
182 struct smb_filename smb_fname;
185 *pp_start = *pp_name;
187 if (!lp_stat_cache()) {
192 namelen = strlen(name);
194 DO_PROFILE_INC(statcache_lookups);
197 * Don't lookup trivial valid directory entries.
199 if ((*name == '\0') || ISDOT(name) || ISDOTDOT(name)) {
203 if (conn->case_sensitive) {
204 chk_name = talloc_strdup(ctx,name);
206 DEBUG(0, ("stat_cache_lookup: strdup failed!\n"));
211 chk_name = talloc_strdup_upper(ctx,name);
213 DEBUG(0, ("stat_cache_lookup: talloc_strdup_upper failed!\n"));
218 * In some language encodings the length changes
219 * if we uppercase. We need to treat this differently
222 if (strlen(chk_name) != namelen) {
230 data_val = data_blob_null;
233 smbd_memcache(), STAT_CACHE,
234 data_blob_const(chk_name, strlen(chk_name)),
239 DEBUG(10,("stat_cache_lookup: lookup failed for name [%s]\n",
242 * Didn't find it - remove last component for next try.
244 if (!(sp = strrchr_m(chk_name, '/'))) {
246 * We reached the end of the name - no match.
248 DO_PROFILE_INC(statcache_misses);
249 TALLOC_FREE(chk_name);
256 * Count the number of times we have done this, we'll
257 * need it when reconstructing the string.
264 if ((*chk_name == '\0')
265 || ISDOT(chk_name) || ISDOTDOT(chk_name)) {
266 DO_PROFILE_INC(statcache_misses);
267 TALLOC_FREE(chk_name);
272 translated_path = talloc_strdup(ctx,(char *)data_val.data);
273 if (!translated_path) {
274 smb_panic("talloc failed");
276 translated_path_length = data_val.length - 1;
278 DEBUG(10,("stat_cache_lookup: lookup succeeded for name [%s] "
279 "-> [%s]\n", chk_name, translated_path ));
280 DO_PROFILE_INC(statcache_hits);
282 ZERO_STRUCT(smb_fname);
283 smb_fname.base_name = translated_path;
285 if (SMB_VFS_STAT(conn, &smb_fname) != 0) {
286 /* Discard this entry - it doesn't exist in the filesystem. */
287 memcache_delete(smbd_memcache(), STAT_CACHE,
288 data_blob_const(chk_name, strlen(chk_name)));
289 TALLOC_FREE(chk_name);
290 TALLOC_FREE(translated_path);
296 memcpy(*pp_name, translated_path,
297 MIN(namelen, translated_path_length));
299 if (num_components == 0) {
300 name = talloc_strndup(ctx, translated_path,
301 translated_path_length);
305 sp = strnrchr_m(name, '/', num_components);
307 name = talloc_asprintf(ctx,"%.*s%s",
308 (int)translated_path_length,
309 translated_path, sp);
311 name = talloc_strndup(ctx,
313 translated_path_length);
318 * TODO: Get us out of here with a real error message
320 smb_panic("talloc failed");
322 TALLOC_FREE(*pp_name);
327 /* set pointer for 'where to start' on fixing the rest of the name */
328 *pp_start = &name[translated_path_length];
329 if (**pp_start == '/') {
333 *pp_dirpath = translated_path;
334 TALLOC_FREE(chk_name);
335 return (namelen == translated_path_length);
338 /***************************************************************************
339 Tell all smbd's to delete an entry.
340 **************************************************************************/
342 void send_stat_cache_delete_message(struct messaging_context *msg_ctx,
346 message_send_all(msg_ctx,
347 MSG_SMB_STAT_CACHE_DELETE,
354 /***************************************************************************
356 **************************************************************************/
358 void stat_cache_delete(const char *name)
360 char *lname = talloc_strdup_upper(talloc_tos(), name);
365 DEBUG(10,("stat_cache_delete: deleting name [%s] -> %s\n",
368 memcache_delete(smbd_memcache(), STAT_CACHE,
369 data_blob_const(lname, talloc_get_size(lname)-1));
373 /***************************************************************
374 Compute a hash value based on a string key value.
375 The function returns the bucket index number for the hashed key.
376 JRA. Use a djb-algorithm hash for speed.
377 ***************************************************************/
379 unsigned int fast_string_hash(TDB_DATA *key)
383 for (p = (const char *)key->dptr; *p != '\0'; p++) {
384 n = ((n << 5) + n) ^ (unsigned int)(*p);
389 /***************************************************************************
390 Initializes or clears the stat cache.
391 **************************************************************************/
393 bool reset_stat_cache( void )
395 if (!lp_stat_cache())
398 memcache_flush(smbd_memcache(), STAT_CACHE);