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Diffstat (limited to 'source4/lib/gencache/gencache.c')
| -rw-r--r-- | source4/lib/gencache/gencache.c | 375 |
1 files changed, 0 insertions, 375 deletions
diff --git a/source4/lib/gencache/gencache.c b/source4/lib/gencache/gencache.c deleted file mode 100644 index aaaa40eea8..0000000000 --- a/source4/lib/gencache/gencache.c +++ /dev/null @@ -1,375 +0,0 @@ -/* - Unix SMB/CIFS implementation. - - Generic, persistent and shared between processes cache mechanism for use - by various parts of the Samba code - - Copyright (C) Rafal Szczesniak 2002 - - 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/>. -*/ - -#include "includes.h" -#include "system/time.h" -#include "system/filesys.h" -#include "tdb_wrap.h" -#include "lib/gencache/gencache.h" - -#define TIMEOUT_LEN 12 -#define CACHE_DATA_FMT "%12u/%s" - -static struct tdb_wrap *cache; - -/** - * @file gencache.c - * @brief Generic, persistent and shared between processes cache mechanism - * for use by various parts of the Samba code - * - **/ - - -/** - * Cache initialisation function. Opens cache tdb file or creates - * it if does not exist. - * - * @return true on successful initialisation of the cache or - * false on failure - **/ - -bool gencache_init(struct loadparm_context *lp_ctx) -{ - char* cache_fname = NULL; - TALLOC_CTX *mem_ctx = talloc_autofree_context(); - - /* skip file open if it's already opened */ - if (cache) return true; - - cache_fname = lock_path(mem_ctx, lp_ctx, "gencache.tdb"); - if (cache_fname != NULL) { - DEBUG(5, ("Opening cache file at %s\n", cache_fname)); - } else { - DEBUG(0, ("Filename allocation failed.\n")); - return false; - } - - cache = tdb_wrap_open(mem_ctx, cache_fname, 0, TDB_DEFAULT, - O_RDWR|O_CREAT, 0644); - - talloc_free(cache_fname); - if (!cache) { - DEBUG(5, ("Attempt to open gencache.tdb has failed.\n")); - return false; - } - return true; -} - - -/** - * Cache shutdown function. Closes opened cache tdb file. - * - * @return true on successful closing the cache or - * false on failure during cache shutdown - **/ - -bool gencache_shutdown(void) -{ - if (!cache) return false; - DEBUG(5, ("Closing cache file\n")); - talloc_free(cache); - return true; -} - - -/** - * Set an entry in the cache file. If there's no such - * one, then add it. - * - * @param keystr string that represents a key of this entry - * @param value text representation value being cached - * @param timeout time when the value is expired - * - * @retval true when entry is successfuly stored - * @retval false on failure - **/ - -bool gencache_set(const char *keystr, const char *value, time_t timeout) -{ - int ret; - TDB_DATA keybuf, databuf; - char* valstr = NULL; - - /* fail completely if get null pointers passed */ - SMB_ASSERT(keystr && value); - - if (!gencache_init()) return false; - - asprintf(&valstr, CACHE_DATA_FMT, (int)timeout, value); - if (!valstr) - return false; - - keybuf.dptr = (uint8_t *)strdup(keystr); - keybuf.dsize = strlen(keystr)+1; - databuf.dptr = (uint8_t *)strdup(valstr); - databuf.dsize = strlen(valstr)+1; - DEBUG(10, ("Adding cache entry with key = %s; value = %s and timeout \ - = %s (%d seconds %s)\n", keybuf.dptr, value, ctime(&timeout), - (int)(timeout - time(NULL)), timeout > time(NULL) ? "ahead" : "in the past")); - - ret = tdb_store(cache->tdb, keybuf, databuf, 0); - SAFE_FREE(valstr); - SAFE_FREE(keybuf.dptr); - SAFE_FREE(databuf.dptr); - - return ret == 0; -} - - -/** - * Set existing entry to the cache file. - * - * @param keystr string that represents a key of this entry - * @param valstr text representation value being cached - * @param timeout time when the value is expired - * - * @retval true when entry is successfuly set - * @retval false on failure - **/ - -bool gencache_set_only(const char *keystr, const char *valstr, time_t timeout) -{ - int ret = -1; - TDB_DATA keybuf, databuf; - char *old_valstr, *datastr; - time_t old_timeout; - - /* fail completely if get null pointers passed */ - SMB_ASSERT(keystr && valstr); - - if (!gencache_init()) return false; - - /* - * Check whether entry exists in the cache - * Don't verify gencache_get exit code, since the entry may be expired - */ - gencache_get(keystr, &old_valstr, &old_timeout); - - if (!(old_valstr && old_timeout)) return false; - - DEBUG(10, ("Setting cache entry with key = %s; old value = %s and old timeout \ - = %s\n", keystr, old_valstr, ctime(&old_timeout))); - - asprintf(&datastr, CACHE_DATA_FMT, (int)timeout, valstr); - keybuf.dptr = (uint8_t *)strdup(keystr); - keybuf.dsize = strlen(keystr)+1; - databuf.dptr = (uint8_t *)strdup(datastr); - databuf.dsize = strlen(datastr)+1; - DEBUGADD(10, ("New value = %s, new timeout = %s (%d seconds %s)", valstr, - ctime(&timeout), (int)(timeout - time(NULL)), - timeout > time(NULL) ? "ahead" : "in the past")); - - - ret = tdb_store(cache->tdb, keybuf, databuf, TDB_REPLACE); - - SAFE_FREE(datastr); - SAFE_FREE(old_valstr); - SAFE_FREE(keybuf.dptr); - SAFE_FREE(databuf.dptr); - - return ret == 0; -} - - -/** - * Delete one entry from the cache file. - * - * @param keystr string that represents a key of this entry - * - * @retval true upon successful deletion - * @retval false in case of failure - **/ - -bool gencache_del(const char *keystr) -{ - int ret; - TDB_DATA keybuf; - - /* fail completely if get null pointers passed */ - SMB_ASSERT(keystr); - - if (!gencache_init()) return false; - - keybuf.dptr = (uint8_t *)strdup(keystr); - keybuf.dsize = strlen(keystr)+1; - DEBUG(10, ("Deleting cache entry (key = %s)\n", keystr)); - ret = tdb_delete(cache->tdb, keybuf); - - SAFE_FREE(keybuf.dptr); - return ret == 0; -} - - -/** - * Get existing entry from the cache file. - * - * @param keystr string that represents a key of this entry - * @param valstr buffer that is allocated and filled with the entry value - * buffer's disposing must be done outside - * @param timeout pointer to a time_t that is filled with entry's - * timeout - * - * @retval true when entry is successfuly fetched - * @retval false for failure - **/ - -bool gencache_get(const char *keystr, char **valstr, time_t *timeout) -{ - TDB_DATA keybuf, databuf; - - /* fail completely if get null pointers passed */ - SMB_ASSERT(keystr); - - if (!gencache_init()) - return false; - - keybuf.dptr = (uint8_t *)strdup(keystr); - keybuf.dsize = strlen(keystr)+1; - databuf = tdb_fetch(cache->tdb, keybuf); - SAFE_FREE(keybuf.dptr); - - if (databuf.dptr && databuf.dsize > TIMEOUT_LEN) { - char* entry_buf = strndup((char *)databuf.dptr, databuf.dsize); - char *v; - time_t t; - unsigned i; - - v = malloc_array_p(char, databuf.dsize - TIMEOUT_LEN); - - SAFE_FREE(databuf.dptr); - sscanf(entry_buf, CACHE_DATA_FMT, (int*)&i, v); - SAFE_FREE(entry_buf); - t = i; - - DEBUG(10, ("Returning %s cache entry: key = %s, value = %s, " - "timeout = %s\n", t > time(NULL) ? "valid" : - "expired", keystr, v, ctime(&t))); - - if (valstr) - *valstr = v; - else - SAFE_FREE(v); - - if (timeout) - *timeout = t; - - return t > time(NULL); - - } else { - SAFE_FREE(databuf.dptr); - - if (valstr) - *valstr = NULL; - - if (timeout) - timeout = NULL; - - DEBUG(10, ("Cache entry with key = %s couldn't be found\n", - keystr)); - - return false; - } -} - - -/** - * Iterate through all entries which key matches to specified pattern - * - * @param fn pointer to the function that will be supplied with each single - * matching cache entry (key, value and timeout) as an arguments - * @param data void pointer to an arbitrary data that is passed directly to the fn - * function on each call - * @param keystr_pattern pattern the existing entries' keys are matched to - * - **/ - -void gencache_iterate(void (*fn)(const char* key, const char *value, time_t timeout, void* dptr), - void* data, const char* keystr_pattern) -{ - TDB_LIST_NODE *node, *first_node; - TDB_DATA databuf; - char *keystr = NULL, *valstr = NULL, *entry = NULL; - time_t timeout = 0; - unsigned i; - - /* fail completely if get null pointers passed */ - SMB_ASSERT(fn && keystr_pattern); - - if (!gencache_init()) return; - - DEBUG(5, ("Searching cache keys with pattern %s\n", keystr_pattern)); - node = tdb_search_keys(cache->tdb, keystr_pattern); - first_node = node; - - while (node) { - /* ensure null termination of the key string */ - keystr = strndup((char *)node->node_key.dptr, node->node_key.dsize); - - /* - * We don't use gencache_get function, because we need to iterate through - * all of the entries. Validity verification is up to fn routine. - */ - databuf = tdb_fetch(cache->tdb, node->node_key); - if (!databuf.dptr || databuf.dsize <= TIMEOUT_LEN) { - SAFE_FREE(databuf.dptr); - SAFE_FREE(keystr); - node = node->next; - continue; - } - entry = strndup((char *)databuf.dptr, databuf.dsize); - SAFE_FREE(databuf.dptr); - valstr = malloc_array_p(char, databuf.dsize - TIMEOUT_LEN); - sscanf(entry, CACHE_DATA_FMT, (int*)(&i), valstr); - timeout = i; - - DEBUG(10, ("Calling function with arguments (key = %s, value = %s, timeout = %s)\n", - keystr, valstr, ctime(&timeout))); - fn(keystr, valstr, timeout, data); - - SAFE_FREE(valstr); - SAFE_FREE(entry); - SAFE_FREE(keystr); - node = node->next; - } - - tdb_search_list_free(first_node); -} - -/******************************************************************** - lock a key -********************************************************************/ - -int gencache_lock_entry( const char *key ) -{ - return tdb_lock_bystring(cache->tdb, key); -} - -/******************************************************************** - unlock a key -********************************************************************/ - -void gencache_unlock_entry( const char *key ) -{ - tdb_unlock_bystring(cache->tdb, key); -} - - |