1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28 #ifndef _RESOLV_CACHE_H_
29 #define _RESOLV_CACHE_H_
31 #include <stddef.h>
32 #include <sys/cdefs.h>
34 struct __res_state;
36 /* sets the name server addresses to the provided res_state structure. The
37 * name servers are retrieved from the cache which is associated
38 * with the network to which the res_state structure is associated */
39 __LIBC_HIDDEN__
40 extern void _resolv_populate_res_for_net(struct __res_state* statp);
42 typedef enum {
43 RESOLV_CACHE_UNSUPPORTED, /* the cache can't handle that kind of queries */
44 /* or the answer buffer is too small */
45 RESOLV_CACHE_NOTFOUND, /* the cache doesn't know about this query */
46 RESOLV_CACHE_FOUND /* the cache found the answer */
47 } ResolvCacheStatus;
49 __LIBC_HIDDEN__
50 extern ResolvCacheStatus
51 _resolv_cache_lookup( unsigned netid,
52 const void* query,
53 int querylen,
54 void* answer,
55 int answersize,
56 int *answerlen );
58 /* add a (query,answer) to the cache, only call if _resolv_cache_lookup
59 * did return RESOLV_CACHE_NOTFOUND
60 */
61 __LIBC_HIDDEN__
62 extern void
63 _resolv_cache_add( unsigned netid,
64 const void* query,
65 int querylen,
66 const void* answer,
67 int answerlen );
69 /* Notify the cache a request failed */
70 __LIBC_HIDDEN__
71 extern void
72 _resolv_cache_query_failed( unsigned netid,
73 const void* query,
74 int querylen);
76 #endif /* _RESOLV_CACHE_H_ */