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, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #define NBTKEY_FMT "NBT/%s#%02X"
30 * Initialise namecache system. Function calls gencache
31 * initialisation function to perform necessary actions
33 * @return true upon successful initialisation of the cache or
37 BOOL namecache_enable(void)
40 * Check if name caching disabled by setting the name cache
44 if (lp_name_cache_timeout() == 0) {
45 DEBUG(5, ("namecache_enable: disabling netbios name cache\n"));
49 /* Init namecache by calling gencache initialisation */
51 if (!gencache_init()) {
52 DEBUG(2, ("namecache_enable: Couldn't initialise namecache on top of gencache.\n"));
56 /* I leave it for now, though I don't think we really need this (mimir, 27.09.2002) */
57 DEBUG(5, ("namecache_enable: enabling netbios namecache, timeout %d "
58 "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: Couldn't close namecache on top of gencache.\n"));
79 DEBUG(5, ("namecache_shutdown: netbios namecache closed successfully.\n"));
85 * Generates a key for netbios name lookups on basis of
86 * netbios name and type.
87 * The caller must free returned key string when finished.
89 * @param name netbios name string (case insensitive)
90 * @param name_type netbios type of the name being looked up
92 * @return string consisted of uppercased name and appended
96 static char* namecache_key(const char *name, int name_type)
99 asprintf(&keystr, NBTKEY_FMT, strupper_static(name), name_type);
106 * Store a name(s) in the name cache
108 * @param name netbios names array
109 * @param name_type integer netbios name type
110 * @param num_names number of names being stored
111 * @param ip_list array of in_addr structures containing
112 * ip addresses being stored
115 BOOL namecache_store(const char *name, int name_type,
116 int num_names, struct ip_service *ip_list)
119 char *key, *value_string;
124 * we use gecache call to avoid annoying debug messages about
125 * initialised namecache again and again...
127 if (!gencache_init()) return False;
129 if (name_type > 255) {
130 return False; /* Don't store non-real name types. */
133 if ( DEBUGLEVEL >= 5 ) {
134 DEBUG(5, ("namecache_store: storing %d address%s for %s#%02x: ",
135 num_names, num_names == 1 ? "": "es", name, name_type));
137 for (i = 0; i < num_names; i++)
138 DEBUGADD(5, ("%s:%d%s", inet_ntoa(ip_list[i].ip),
139 ip_list[i].port, (i == (num_names - 1) ? "" : ",")));
144 key = namecache_key(name, name_type);
149 expiry = time(NULL) + lp_name_cache_timeout();
152 * Generate string representation of ip addresses list
153 * First, store the number of ip addresses and then
154 * place each single ip
156 if (!ipstr_list_make(&value_string, ip_list, num_names)) {
158 SAFE_FREE(value_string);
163 ret = gencache_set(key, value_string, expiry);
165 SAFE_FREE(value_string);
171 * Look up a name in the cache.
173 * @param name netbios name to look up for
174 * @param name_type netbios name type of @param name
175 * @param ip_list mallocated list of IP addresses if found in the cache,
177 * @param num_names number of entries found
179 * @return true upon successful fetch or
180 * false if name isn't found in the cache or has expired
183 BOOL namecache_fetch(const char *name, int name_type, struct ip_service **ip_list,
189 /* exit now if null pointers were passed as they're required further */
190 if (!ip_list || !num_names) return False;
192 if (!gencache_init())
195 if (name_type > 255) {
196 return False; /* Don't fetch non-real name types. */
202 * Use gencache interface - lookup the key
204 key = namecache_key(name, name_type);
209 if (!gencache_get(key, &value, &timeout)) {
210 DEBUG(5, ("no entry for %s#%02X found.\n", name, name_type));
214 DEBUG(5, ("name %s#%02X found.\n", name, name_type));
218 * Split up the stored value into the list of IP adresses
220 *num_names = ipstr_list_parse(value, ip_list);
225 return *num_names > 0; /* true only if some ip has been fetched */
229 * Remove a namecache entry. Needed for site support.
233 BOOL namecache_delete(const char *name, int name_type)
238 if (!gencache_init())
241 if (name_type > 255) {
242 return False; /* Don't fetch non-real name types. */
245 key = namecache_key(name, name_type);
249 ret = gencache_del(key);
255 * Delete single namecache entry. Look at the
256 * gencache_iterate definition.
260 static void flush_netbios_name(const char* key, const char *value, time_t timeout, void* dptr)
263 DEBUG(5, ("Deleting entry %s\n", key));
268 * Flush all names from the name cache.
269 * It's done by gencache_iterate()
271 * @return True upon successful deletion or
272 * False in case of an error
275 void namecache_flush(void)
277 if (!gencache_init())
281 * iterate through each NBT cache's entry and flush it
282 * by flush_netbios_name function
284 gencache_iterate(flush_netbios_name, NULL, "NBT/*");
285 DEBUG(5, ("Namecache flushed\n"));
288 /* Construct a name status record key. */
290 static char *namecache_status_record_key(const char *name, int name_type1,
291 int name_type2, struct in_addr keyip)
295 asprintf(&keystr, "NBT/%s#%02X.%02X.%s",
296 strupper_static(name), name_type1, name_type2, inet_ntoa(keyip));
300 /* Store a name status record. */
302 BOOL namecache_status_store(const char *keyname, int keyname_type,
303 int name_type, struct in_addr keyip,
310 if (!gencache_init())
313 key = namecache_status_record_key(keyname, keyname_type, name_type, keyip);
317 expiry = time(NULL) + lp_name_cache_timeout();
318 ret = gencache_set(key, srvname, expiry);
321 DEBUG(5, ("namecache_status_store: entry %s -> %s\n", key, srvname ));
323 DEBUG(5, ("namecache_status_store: entry %s store failed.\n", key ));
329 /* Fetch a name status record. */
331 BOOL namecache_status_fetch(const char *keyname, int keyname_type,
332 int name_type, struct in_addr keyip, char *srvname_out)
338 if (!gencache_init())
341 key = namecache_status_record_key(keyname, keyname_type, name_type, keyip);
345 if (!gencache_get(key, &value, &timeout)) {
346 DEBUG(5, ("namecache_status_fetch: no entry for %s found.\n", key));
350 DEBUG(5, ("namecache_status_fetch: key %s -> %s\n", key, value ));
353 strlcpy(srvname_out, value, 16);