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/*
Unix SMB/CIFS implementation.
Trusted domain names cache on top of gencache.
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_ALL /* there's no proper class yet */
#define TDOMKEY_FMT "TDOM/%s"
/**
* @file trustdom_cache.c
*
* Implementation of trusted domain names cache useful when
* samba acts as domain member server. In such case, caching
* domain names currently trusted gives a performance gain
* because there's no need to query PDC each time we need
* list of trusted domains
**/
/**
* Initialise trustdom name caching system. Call gencache
* initialisation routine to perform necessary activities.
*
* @return true upon successful cache initialisation or
* false if cache init failed
**/
BOOL trustdom_cache_enable(void)
{
/* Init trustdom cache by calling gencache initialisation */
if (!gencache_init()) {
DEBUG(2, ("trustdomcache_enable: Couldn't initialise trustdom cache on top of gencache.\n"));
return False;
}
return True;
}
/**
* Shutdown trustdom name caching system. Calls gencache
* shutdown function.
*
* @return true upon successful cache close or
* false if it failed
**/
BOOL trustdom_cache_shutdown(void)
{
/* Close trustdom cache by calling gencache shutdown */
if (!gencache_shutdown()) {
DEBUG(2, ("trustdomcache_shutdown: Couldn't shutdown trustdom cache on top of gencache.\n"));
return False;
}
return True;
}
/**
* Form up trustdom name key. It is based only
* on domain name now.
*
* @param name trusted domain name
* @return cache key for use in gencache mechanism
**/
static char* trustdom_cache_key(const char* name)
{
char* keystr = NULL;
asprintf(&keystr, TDOMKEY_FMT, strupper_static(name));
return keystr;
}
/**
* Store trusted domain in gencache as the domain name (key)
* and ip address of domain controller (value)
*
* @param name trusted domain name
* @param alt_name alternative trusted domain name (used in ADS domains)
* @param sid trusted domain's SID
* @param timeout cache entry expiration time
* @return true upon successful value storing or
* false if store attempt failed
**/
BOOL trustdom_cache_store(char* name, char* alt_name, const DOM_SID *sid,
time_t timeout)
{
char *key, *alt_key;
fstring sid_string;
/*
* we use gecache call to avoid annoying debug messages
* about initialised trustdom
*/
if (!gencache_init()) return False;
DEBUG(5, ("trustdom_store: storing SID %s of domain %s\n",
sid_string_static(sid), name));
key = trustdom_cache_key(name);
alt_key = alt_name ? trustdom_cache_key(alt_name) : NULL;
/* Generate string representation domain SID */
sid_to_string(sid_string, sid);
/*
* try to put the names in the cache
*/
if (alt_key) {
return (gencache_set(alt_key, sid_string, timeout)
&& gencache_set(key, sid_string, timeout));
}
return gencache_set(key, sid_string, timeout);
}
/**
* Fetch trusted domain's dc from the gencache.
* This routine can also be used to check whether given
* domain is currently trusted one.
*
* @param name trusted domain name
* @param sid trusted domain's SID to be returned
* @return true if entry is found or
* false if has expired/doesn't exist
**/
BOOL trustdom_cache_fetch(const char* name, DOM_SID* sid)
{
char *key, *value;
time_t timeout;
/* init the cache */
if (!gencache_init()) return False;
/* exit now if null pointers were passed as they're required further */
if (!sid) return False;
/* prepare a key and get the value */
key = trustdom_cache_key(name);
if (!key) return False;
if (!gencache_get(key, &value, &timeout)) {
DEBUG(5, ("no entry for trusted domain %s found.\n", name));
SAFE_FREE(key);
return False;
} else {
SAFE_FREE(key);
DEBUG(5, ("trusted domain %s found (%s)\n", name, value));
}
/* convert ip string representation into in_addr structure */
if(! string_to_sid(sid, value)) {
sid = NULL;
return False;
}
return True;
}
/**
* Delete single trustdom entry. Look at the
* gencache_iterate definition.
*
**/
static void flush_trustdom_name(const char* key, const char *value, time_t timeout, void* dptr)
{
gencache_del(key);
DEBUG(5, ("Deleting entry %s\n", key));
}
/**
* Flush all the trusted domains entries from the cache.
**/
void trustdom_cache_flush(void)
{
if (!gencache_init())
return;
/*
* iterate through each TDOM cache's entry and flush it
* by flush_trustdom_name function
*/
gencache_iterate(flush_trustdom_name, NULL, trustdom_cache_key("*"));
DEBUG(5, ("Trusted domains cache flushed\n"));
}
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