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
8 Copyright (C) Jeremy Allison 2007
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 3 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program. If not, see <http://www.gnu.org/licenses/>.
26 #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: "
52 "Couldn't initialise namecache on top of gencache.\n"));
56 /* I leave it for now, though I don't think we really
57 * need this (mimir, 27.09.2002) */
58 DEBUG(5, ("namecache_enable: enabling netbios namecache, timeout %d "
59 "seconds\n", lp_name_cache_timeout()));
65 * Shutdown namecache. Routine calls gencache close function
66 * to safely close gencache file.
68 * @return true upon successful shutdown of the cache or
72 bool namecache_shutdown(void)
74 if (!gencache_shutdown()) {
75 DEBUG(2, ("namecache_shutdown: "
76 "Couldn't close namecache on top of gencache.\n"));
80 DEBUG(5, ("namecache_shutdown: "
81 "netbios namecache closed successfully.\n"));
86 * Generates a key for netbios name lookups on basis of
87 * netbios name and type.
88 * The caller must free returned key string when finished.
90 * @param name netbios name string (case insensitive)
91 * @param name_type netbios type of the name being looked up
93 * @return string consisted of uppercased name and appended
97 static char* namecache_key(const char *name,
101 asprintf_strupper_m(&keystr, NBTKEY_FMT, name, name_type);
107 * Store a name(s) in the name cache
109 * @param name netbios names array
110 * @param name_type integer netbios name type
111 * @param num_names number of names being stored
112 * @param ip_list array of in_addr structures containing
113 * ip addresses being stored
116 bool namecache_store(const char *name,
119 struct ip_service *ip_list)
122 char *key, *value_string;
127 * we use gecache call to avoid annoying debug messages about
128 * initialised namecache again and again...
130 if (!gencache_init()) {
134 if (name_type > 255) {
135 return False; /* Don't store non-real name types. */
138 if ( DEBUGLEVEL >= 5 ) {
139 TALLOC_CTX *ctx = talloc_stackframe();
142 DEBUG(5, ("namecache_store: storing %d address%s for %s#%02x: ",
143 num_names, num_names == 1 ? "": "es", name, name_type));
145 for (i = 0; i < num_names; i++) {
146 addr = print_canonical_sockaddr(ctx,
151 DEBUGADD(5, ("%s%s", addr,
152 (i == (num_names - 1) ? "" : ",")));
159 key = namecache_key(name, name_type);
164 expiry = time(NULL) + lp_name_cache_timeout();
167 * Generate string representation of ip addresses list
168 * First, store the number of ip addresses and then
169 * place each single ip
171 if (!ipstr_list_make(&value_string, ip_list, num_names)) {
173 SAFE_FREE(value_string);
178 ret = gencache_set(key, value_string, expiry);
180 SAFE_FREE(value_string);
185 * Look up a name in the cache.
187 * @param name netbios name to look up for
188 * @param name_type netbios name type of @param name
189 * @param ip_list mallocated list of IP addresses if found in the cache,
191 * @param num_names number of entries found
193 * @return true upon successful fetch or
194 * false if name isn't found in the cache or has expired
197 bool namecache_fetch(const char *name,
199 struct ip_service **ip_list,
205 /* exit now if null pointers were passed as they're required further */
206 if (!ip_list || !num_names) {
210 if (!gencache_init()) {
214 if (name_type > 255) {
215 return False; /* Don't fetch non-real name types. */
221 * Use gencache interface - lookup the key
223 key = namecache_key(name, name_type);
228 if (!gencache_get(key, &value, &timeout)) {
229 DEBUG(5, ("no entry for %s#%02X found.\n", name, name_type));
233 DEBUG(5, ("name %s#%02X found.\n", name, name_type));
237 * Split up the stored value into the list of IP adresses
239 *num_names = ipstr_list_parse(value, ip_list);
244 return *num_names > 0; /* true only if some ip has been fetched */
248 * Remove a namecache entry. Needed for site support.
252 bool namecache_delete(const char *name, int name_type)
257 if (!gencache_init())
260 if (name_type > 255) {
261 return False; /* Don't fetch non-real name types. */
264 key = namecache_key(name, name_type);
268 ret = gencache_del(key);
274 * Delete single namecache entry. Look at the
275 * gencache_iterate definition.
279 static void flush_netbios_name(const char *key,
285 DEBUG(5, ("Deleting entry %s\n", key));
289 * Flush all names from the name cache.
290 * It's done by gencache_iterate()
292 * @return true upon successful deletion or
293 * false in case of an error
296 void namecache_flush(void)
298 if (!gencache_init()) {
303 * iterate through each NBT cache's entry and flush it
304 * by flush_netbios_name function
306 gencache_iterate(flush_netbios_name, NULL, "NBT/*");
307 DEBUG(5, ("Namecache flushed\n"));
310 /* Construct a name status record key. */
312 static char *namecache_status_record_key(const char *name,
315 const struct sockaddr_storage *keyip)
317 char addr[INET6_ADDRSTRLEN];
320 print_sockaddr(addr, sizeof(addr), keyip);
321 asprintf_strupper_m(&keystr, "NBT/%s#%02X.%02X.%s", name,
322 name_type1, name_type2, addr);
326 /* Store a name status record. */
328 bool namecache_status_store(const char *keyname, int keyname_type,
329 int name_type, const struct sockaddr_storage *keyip,
336 if (!gencache_init()) {
340 key = namecache_status_record_key(keyname, keyname_type,
345 expiry = time(NULL) + lp_name_cache_timeout();
346 ret = gencache_set(key, srvname, expiry);
349 DEBUG(5, ("namecache_status_store: entry %s -> %s\n",
352 DEBUG(5, ("namecache_status_store: entry %s store failed.\n",
360 /* Fetch a name status record. */
362 bool namecache_status_fetch(const char *keyname,
365 const struct sockaddr_storage *keyip,
372 if (!gencache_init())
375 key = namecache_status_record_key(keyname, keyname_type,
380 if (!gencache_get(key, &value, &timeout)) {
381 DEBUG(5, ("namecache_status_fetch: no entry for %s found.\n",
386 DEBUG(5, ("namecache_status_fetch: key %s -> %s\n",
390 strlcpy(srvname_out, value, 16);