michael@0: /*
michael@0:  * Copyright (C) 2008 The Android Open Source Project
michael@0:  * All rights reserved.
michael@0:  *
michael@0:  * Redistribution and use in source and binary forms, with or without
michael@0:  * modification, are permitted provided that the following conditions
michael@0:  * are met:
michael@0:  *  * Redistributions of source code must retain the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer.
michael@0:  *  * Redistributions in binary form must reproduce the above copyright
michael@0:  *    notice, this list of conditions and the following disclaimer in
michael@0:  *    the documentation and/or other materials provided with the
michael@0:  *    distribution.
michael@0:  *
michael@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
michael@0:  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
michael@0:  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
michael@0:  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
michael@0:  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
michael@0:  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
michael@0:  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
michael@0:  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
michael@0:  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
michael@0:  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
michael@0:  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
michael@0:  * SUCH DAMAGE.
michael@0:  */
michael@0: 
michael@0: /*
michael@0:  * This version of this file is derived from Android 2.3 "Gingerbread",
michael@0:  * which contains uncredited changes by Android/Google developers.  It has
michael@0:  * been modified in 2011 for use in the Android build of Mozilla Firefox by
michael@0:  * Mozilla contributors (including Michael Edwards <m.k.edwards@gmail.com>,
michael@0:  * and Steve Workman <sjhworkman@gmail.com>).
michael@0:  * These changes are offered under the same license as the original NetBSD
michael@0:  * file, whose copyright and license are unchanged above.
michael@0:  */
michael@0: 
michael@0: #ifndef _RESOLV_CACHE_H_
michael@0: #define _RESOLV_CACHE_H_
michael@0: 
michael@0: struct resolv_cache;  /* forward */
michael@0: 
michael@0: /* get cache instance, can be NULL if cache is disabled
michael@0:  * (e.g. through an environment variable) */
michael@0: extern struct resolv_cache*  __get_res_cache(void);
michael@0: 
michael@0: /* this gets called everytime we detect some changes in the DNS configuration
michael@0:  * and will flush the cache */
michael@0: extern void   _resolv_cache_reset( unsigned  generation );
michael@0: 
michael@0: typedef enum {
michael@0:     RESOLV_CACHE_UNSUPPORTED,  /* the cache can't handle that kind of queries */
michael@0:                                /* or the answer buffer is too small */
michael@0:     RESOLV_CACHE_NOTFOUND,     /* the cache doesn't know about this query */
michael@0:     RESOLV_CACHE_FOUND         /* the cache found the answer */
michael@0: } ResolvCacheStatus;
michael@0: 
michael@0: extern ResolvCacheStatus
michael@0: _resolv_cache_lookup( struct resolv_cache*  cache,
michael@0:                       const void*           query,
michael@0:                       int                   querylen,
michael@0:                       void*                 answer,
michael@0:                       int                   answersize,
michael@0:                       int                  *answerlen );
michael@0: 
michael@0: /* add a (query,answer) to the cache, only call if _resolv_cache_lookup
michael@0:  * did return RESOLV_CACHE_NOTFOUND
michael@0:  */
michael@0: extern void
michael@0: _resolv_cache_add( struct resolv_cache*  cache,
michael@0:                    const void*           query,
michael@0:                    int                   querylen,
michael@0:                    const void*           answer,
michael@0:                    int                   answerlen );
michael@0: 
michael@0: #endif /* _RESOLV_CACHE_H_ */