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r4894: namecache.c is not used any more either
(This used to be commit 24927e69d8)
This commit is contained in:
Andrew Tridgell
Gerald (Jerry) Carter
parent
4962fd4f28
commit
a721be4519
@ -1,247 +0,0 @@
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/*
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Unix SMB/CIFS implementation.
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NetBIOS name cache module on top of gencache mechanism.
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Copyright (C) Tim Potter 2002
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Copyright (C) Rafal Szczesniak 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "system/time.h"
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#define NBTKEY_FMT "NBT/%s#%02X"
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/**
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* Initialise namecache system. Function calls gencache
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* initialisation function to perform necessary actions
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*
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* @return true upon successful initialisation of the cache or
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* false on failure
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**/
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BOOL namecache_enableTODO(void)
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{
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/*
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* Check if name caching disabled by setting the name cache
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* timeout to zero.
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*/
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if (lp_name_cache_timeout() == 0) {
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DEBUG(5, ("namecache_enable: disabling netbios name cache\n"));
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return False;
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}
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/* Init namecache by calling gencache initialisation */
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if (!gencache_init()) {
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DEBUG(2, ("namecache_enable: Couldn't initialise namecache on top of gencache.\n"));
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return False;
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}
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/* I leave it for now, though I don't think we really need this (mimir, 27.09.2002) */
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DEBUG(5, ("namecache_enable: enabling netbios namecache, timeout %d "
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"seconds\n", lp_name_cache_timeout()));
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return True;
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}
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/**
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* Shutdown namecache. Routine calls gencache close function
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* to safely close gencache file.
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*
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* @return true upon successful shutdown of the cache or
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* false on failure
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**/
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BOOL namecache_shutdownTODO(void)
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{
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if (!gencache_shutdown()) {
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DEBUG(2, ("namecache_shutdown: Couldn't close namecache on top of gencache.\n"));
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return False;
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}
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DEBUG(5, ("namecache_shutdown: netbios namecache closed successfully.\n"));
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return True;
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}
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/**
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* Generates a key for netbios name lookups on basis of
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* netbios name and type.
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* The caller must free returned key string when finished.
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*
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* @param name netbios name string (case insensitive)
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* @param name_type netbios type of the name being looked up
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*
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* @return string consisted of uppercased name and appended
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* type number
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*/
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static char* namecache_key(TALLOC_CTX *mem_ctx, const char *name, int name_type)
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{
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char *keystr;
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asprintf(&keystr, NBTKEY_FMT, strupper_talloc(mem_ctx, name), name_type);
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return keystr;
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}
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/**
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* Store a name(s) in the name cache
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*
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* @param name netbios names array
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* @param name_type integer netbios name type
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* @param num_names number of names being stored
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* @param ip_list array of in_addr structures containing
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* ip addresses being stored
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**/
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BOOL namecache_store(TALLOC_CTX *mem_ctx, const char *name, int name_type,
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int num_names, struct ipv4_addr *ip_list)
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{
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time_t expiry;
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char *key, *value_string;
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int i;
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/*
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* we use gecache call to avoid annoying debug messages about
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* initialised namecache again and again...
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*/
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if (!gencache_init()) return False;
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DEBUG(5, ("namecache_store: storing %d address%s for %s#%02x: ",
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num_names, num_names == 1 ? "": "es", name, name_type));
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for (i = 0; i < num_names; i++)
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DEBUGADD(5, ("%s%s", sys_inet_ntoa(ip_list[i]),
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i == (num_names - 1) ? "" : ", "));
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DEBUGADD(5, ("\n"));
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key = namecache_key(mem_ctx, name, name_type);
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/*
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* Cache pdc location or dc lists for only a little while
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* otherwise if we lock on to a bad DC we can potentially be
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* out of action for the entire cache timeout time!
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*/
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if (name_type == 0x1b || name_type == 0x1c)
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expiry = time(NULL) + 10;
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else
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expiry = time(NULL) + lp_name_cache_timeout();
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/*
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* Generate string representation of ip addresses list
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* First, store the number of ip addresses and then
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* place each single ip
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*/
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ipstr_list_make(&value_string, ip_list, num_names);
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/* set the entry */
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return (gencache_set(key, value_string, expiry));
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}
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/**
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* Look up a name in the cache.
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*
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* @param name netbios name to look up for
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* @param name_type netbios name type of @param name
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* @param ip_list mallocated list of IP addresses if found in the cache,
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* NULL otherwise
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* @param num_names number of entries found
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*
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* @return true upon successful fetch or
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* false if name isn't found in the cache or has expired
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**/
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BOOL namecache_fetch(TALLOC_CTX *mem_ctx, const char *name, int name_type, struct ipv4_addr **ip_list,
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int *num_names)
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{
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char *key, *value;
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time_t timeout;
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*num_names = 0;
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/* exit now if null pointers were passed as they're required further */
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if (!ip_list || !num_names) return False;
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if (!gencache_init())
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return False;
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/*
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* Use gencache interface - lookup the key
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*/
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key = namecache_key(mem_ctx, name, name_type);
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if (!gencache_get(key, &value, &timeout)) {
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DEBUG(5, ("no entry for %s#%02X found.\n", name, name_type));
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SAFE_FREE(key);
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return False;
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} else {
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DEBUG(5, ("name %s#%02X found.\n", name, name_type));
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}
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/*
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* Split up the stored value into the list of IP adresses
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*/
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*num_names = ipstr_list_parse(value, ip_list);
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SAFE_FREE(key);
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SAFE_FREE(value);
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return *num_names > 0; /* true only if some ip has been fetched */
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}
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/**
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* Delete single namecache entry. Look at the
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* gencache_iterate definition.
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*
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**/
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static void flush_netbios_name(const char* key, const char *value, time_t timeout, void* dptr)
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{
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gencache_del(key);
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DEBUG(5, ("Deleting entry %s\n", key));
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}
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/**
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* Flush all names from the name cache.
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* It's done by gencache_iterate()
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*
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* @return True upon successful deletion or
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* False in case of an error
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**/
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void namecache_flush(void)
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{
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if (!gencache_init())
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return;
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/*
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* iterate through each NBT cache's entry and flush it
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* by flush_netbios_name function
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*/
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gencache_iterate(flush_netbios_name, NULL, "NBT/*");
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DEBUG(5, ("Namecache flushed\n"));
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}
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