67 lines
2.8 KiB
C
67 lines
2.8 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2008 The Android Open Source Project
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* Redistribution and use in source and binary forms, with or without
|
||
|
|
* modification, are permitted provided that the following conditions
|
||
|
|
* are met:
|
||
|
|
* * Redistributions of source code must retain the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer.
|
||
|
|
* * Redistributions in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in
|
||
|
|
* the documentation and/or other materials provided with the
|
||
|
|
* distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
|
||
|
|
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
* SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
#ifndef _RESOLV_CACHE_H_
|
||
|
|
#define _RESOLV_CACHE_H_
|
||
|
|
|
||
|
|
struct resolv_cache; /* forward */
|
||
|
|
|
||
|
|
/* get cache instance, can be NULL if cache is disabled
|
||
|
|
* (e.g. through an environment variable) */
|
||
|
|
extern struct resolv_cache* __get_res_cache(void);
|
||
|
|
|
||
|
|
/* this gets called everytime we detect some changes in the DNS configuration
|
||
|
|
* and will flush the cache */
|
||
|
|
extern void _resolv_cache_reset( unsigned generation );
|
||
|
|
|
||
|
|
typedef enum {
|
||
|
|
RESOLV_CACHE_UNSUPPORTED, /* the cache can't handle that kind of queries */
|
||
|
|
/* or the answer buffer is too small */
|
||
|
|
RESOLV_CACHE_NOTFOUND, /* the cache doesn't know about this query */
|
||
|
|
RESOLV_CACHE_FOUND /* the cache found the answer */
|
||
|
|
} ResolvCacheStatus;
|
||
|
|
|
||
|
|
extern ResolvCacheStatus
|
||
|
|
_resolv_cache_lookup( struct resolv_cache* cache,
|
||
|
|
const void* query,
|
||
|
|
int querylen,
|
||
|
|
void* answer,
|
||
|
|
int answersize,
|
||
|
|
int *answerlen );
|
||
|
|
|
||
|
|
/* add a (query,answer) to the cache, only call if _resolv_cache_lookup
|
||
|
|
* did return RESOLV_CACHE_NOTFOUND
|
||
|
|
*/
|
||
|
|
extern void
|
||
|
|
_resolv_cache_add( struct resolv_cache* cache,
|
||
|
|
const void* query,
|
||
|
|
int querylen,
|
||
|
|
const void* answer,
|
||
|
|
int answerlen );
|
||
|
|
|
||
|
|
#endif /* _RESOLV_CACHE_H_ */
|