2 Unix SMB/CIFS implementation.
4 NetBIOS name cache module on top of gencache mechanism.
6 Copyright (C) Tim Potter 2002
7 Copyright (C) Rafal Szczesniak 2002
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 #define NBTKEY_FMT "NBT/%s#%02X"
29 * Initialise namecache system. Function calls gencache
30 * initialisation function to perform necessary actions
32 * @return true upon successful initialisation of the cache or
36 BOOL namecache_enable(void)
39 * Check if name caching disabled by setting the name cache
43 if (lp_name_cache_timeout() == 0) {
44 DEBUG(5, ("namecache_enable: disabling netbios name cache\n"));
48 /* Init namecache by calling gencache initialisation */
50 if (!gencache_init()) {
51 DEBUG(2, ("namecache_enable: Couldn't initialise namecache on top of gencache.\n"));
55 /* I leave it for now, though I don't think we really need this (mimir, 27.09.2002) */
56 DEBUG(5, ("namecache_enable: enabling netbios namecache, timeout %d "
57 "seconds\n", lp_name_cache_timeout()));
64 * Shutdown namecache. Routine calls gencache close function
65 * to safely close gencache file.
67 * @return true upon successful shutdown of the cache or
71 BOOL namecache_shutdown(void)
73 if (!gencache_shutdown()) {
74 DEBUG(2, ("namecache_shutdown: Couldn't close namecache on top of gencache.\n"));
78 DEBUG(5, ("namecache_shutdown: netbios namecache closed successfully.\n"));
84 * Generates a key for netbios name lookups on basis of
85 * netbios name and type.
86 * The caller must free returned key string when finished.
88 * @param name netbios name string (case insensitive)
89 * @param name_type netbios type of the name being looked up
91 * @return string consisted of uppercased name and appended
95 static char* namecache_key(const char *name, int name_type)
98 asprintf(&keystr, NBTKEY_FMT, strupper_static(name), name_type);
105 * Store a name(s) in the name cache
107 * @param name netbios names array
108 * @param name_type integer netbios name type
109 * @param num_names number of names being stored
110 * @param ip_list array of in_addr structures containing
111 * ip addresses being stored
114 BOOL namecache_store(const char *name, int name_type,
115 int num_names, struct ip_service *ip_list)
118 char *key, *value_string;
123 * we use gecache call to avoid annoying debug messages about
124 * initialised namecache again and again...
126 if (!gencache_init()) return False;
128 if (name_type > 255) {
129 return False; /* Don't store non-real name types. */
132 if ( DEBUGLEVEL >= 5 ) {
133 DEBUG(5, ("namecache_store: storing %d address%s for %s#%02x: ",
134 num_names, num_names == 1 ? "": "es", name, name_type));
136 for (i = 0; i < num_names; i++)
137 DEBUGADD(5, ("%s:%d%s", inet_ntoa(ip_list[i].ip),
138 ip_list[i].port, (i == (num_names - 1) ? "" : ",")));
143 key = namecache_key(name, name_type);
148 expiry = time(NULL) + lp_name_cache_timeout();
151 * Generate string representation of ip addresses list
152 * First, store the number of ip addresses and then
153 * place each single ip
155 if (!ipstr_list_make(&value_string, ip_list, num_names)) {
157 SAFE_FREE(value_string);
162 ret = gencache_set(key, value_string, expiry);
164 SAFE_FREE(value_string);
170 * Look up a name in the cache.
172 * @param name netbios name to look up for
173 * @param name_type netbios name type of @param name
174 * @param ip_list mallocated list of IP addresses if found in the cache,
176 * @param num_names number of entries found
178 * @return true upon successful fetch or
179 * false if name isn't found in the cache or has expired
182 BOOL namecache_fetch(const char *name, int name_type, struct ip_service **ip_list,
188 /* exit now if null pointers were passed as they're required further */
189 if (!ip_list || !num_names) return False;
191 if (!gencache_init())
194 if (name_type > 255) {
195 return False; /* Don't fetch non-real name types. */
201 * Use gencache interface - lookup the key
203 key = namecache_key(name, name_type);
208 if (!gencache_get(key, &value, &timeout)) {
209 DEBUG(5, ("no entry for %s#%02X found.\n", name, name_type));
213 DEBUG(5, ("name %s#%02X found.\n", name, name_type));
217 * Split up the stored value into the list of IP adresses
219 *num_names = ipstr_list_parse(value, ip_list);
224 return *num_names > 0; /* true only if some ip has been fetched */
228 * Remove a namecache entry. Needed for site support.
232 BOOL namecache_delete(const char *name, int name_type)
237 if (!gencache_init())
240 if (name_type > 255) {
241 return False; /* Don't fetch non-real name types. */
244 key = namecache_key(name, name_type);
248 ret = gencache_del(key);
254 * Delete single namecache entry. Look at the
255 * gencache_iterate definition.
259 static void flush_netbios_name(const char* key, const char *value, time_t timeout, void* dptr)
262 DEBUG(5, ("Deleting entry %s\n", key));
267 * Flush all names from the name cache.
268 * It's done by gencache_iterate()
270 * @return True upon successful deletion or
271 * False in case of an error
274 void namecache_flush(void)
276 if (!gencache_init())
280 * iterate through each NBT cache's entry and flush it
281 * by flush_netbios_name function
283 gencache_iterate(flush_netbios_name, NULL, "NBT/*");
284 DEBUG(5, ("Namecache flushed\n"));
287 /* Construct a name status record key. */
289 static char *namecache_status_record_key(const char *name, int name_type1,
290 int name_type2, struct in_addr keyip)
294 asprintf(&keystr, "NBT/%s#%02X.%02X.%s",
295 strupper_static(name), name_type1, name_type2, inet_ntoa(keyip));
299 /* Store a name status record. */
301 BOOL namecache_status_store(const char *keyname, int keyname_type,
302 int name_type, struct in_addr keyip,
309 if (!gencache_init())
312 key = namecache_status_record_key(keyname, keyname_type, name_type, keyip);
316 expiry = time(NULL) + lp_name_cache_timeout();
317 ret = gencache_set(key, srvname, expiry);
320 DEBUG(5, ("namecache_status_store: entry %s -> %s\n", key, srvname ));
322 DEBUG(5, ("namecache_status_store: entry %s store failed.\n", key ));
328 /* Fetch a name status record. */
330 BOOL namecache_status_fetch(const char *keyname, int keyname_type,
331 int name_type, struct in_addr keyip, char *srvname_out)
337 if (!gencache_init())
340 key = namecache_status_record_key(keyname, keyname_type, name_type, keyip);
344 if (!gencache_get(key, &value, &timeout)) {
345 DEBUG(5, ("namecache_status_fetch: no entry for %s found.\n", key));
349 DEBUG(5, ("namecache_status_fetch: key %s -> %s\n", key, value ));
352 strlcpy(srvname_out, value, 16);