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_ 30 31 #include <stddef.h> 32 #include <sys/cdefs.h> 33 34 struct __res_state; 35 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); 41 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; 48 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 ); 57 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 ); 68 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); 75 76 #endif /* _RESOLV_CACHE_H_ */ 77