| 1 | /* |
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| 2 | * Copyright (c) 1983, 1987, 1989 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 4. Neither the name of the University nor the names of its contributors |
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| 14 | * may be used to endorse or promote products derived from this software |
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| 15 | * without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 27 | * SUCH DAMAGE. |
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| 28 | */ |
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| 29 | |
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| 30 | /* |
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| 31 | * Portions Copyright (c) 1996-1999 by Internet Software Consortium. |
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| 32 | * |
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| 33 | * Permission to use, copy, modify, and distribute this software for any |
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| 34 | * purpose with or without fee is hereby granted, provided that the above |
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| 35 | * copyright notice and this permission notice appear in all copies. |
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| 36 | * |
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| 37 | * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS |
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| 38 | * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES |
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| 39 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE |
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| 40 | * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 41 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 42 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 43 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 44 | * SOFTWARE. |
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| 45 | */ |
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| 46 | |
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| 47 | /* |
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| 48 | * @(#)resolv.h 8.1 (Berkeley) 6/2/93 |
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| 49 | * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $ |
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| 50 | */ |
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| 51 | |
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| 52 | #ifndef _RESOLV_H_ |
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| 53 | #define _RESOLV_H_ |
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| 54 | |
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| 55 | #include <sys/param.h> |
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| 56 | #if (!defined(BSD)) || (BSD < 199306) |
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| 57 | # include <sys/bitypes.h> |
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| 58 | #else |
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| 59 | # include <sys/types.h> |
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| 60 | #endif |
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| 61 | #include <sys/cdefs.h> |
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| 62 | #include <stdio.h> |
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| 63 | |
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| 64 | #include <netinet/in.h> |
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| 65 | #include <arpa/nameser.h> |
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| 66 | |
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| 67 | /* |
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| 68 | * Revision information. This is the release date in YYYYMMDD format. |
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| 69 | * It can change every day so the right thing to do with it is use it |
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| 70 | * in preprocessor commands such as "#if (__RES > 19931104)". Do not |
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| 71 | * compare for equality; rather, use it to determine whether your resolver |
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| 72 | * is new enough to contain a certain feature. |
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| 73 | */ |
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| 74 | |
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| 75 | /* #define __RES 19991006 we don't have a new resolver yet */ |
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| 76 | #define __RES 19960801 |
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| 77 | |
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| 78 | /* |
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| 79 | * Resolver configuration file. |
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| 80 | * Normally not present, but may contain the address of the |
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| 81 | * inital name server(s) to query and the domain search list. |
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| 82 | */ |
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| 83 | |
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| 84 | #ifndef _PATH_RESCONF |
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| 85 | #define _PATH_RESCONF "/etc/resolv.conf" |
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| 86 | #endif |
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| 87 | |
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| 88 | typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } |
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| 89 | res_sendhookact; |
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| 90 | |
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| 91 | typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns, |
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| 92 | const u_char **query, |
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| 93 | int *querylen, |
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| 94 | u_char *ans, |
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| 95 | int anssiz, |
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| 96 | int *resplen); |
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| 97 | |
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| 98 | typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns, |
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| 99 | const u_char *query, |
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| 100 | int querylen, |
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| 101 | u_char *ans, |
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| 102 | int anssiz, |
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| 103 | int *resplen); |
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| 104 | |
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| 105 | struct res_sym { |
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| 106 | int number; /* Identifying number, like T_MX */ |
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| 107 | char * name; /* Its symbolic name, like "MX" */ |
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| 108 | char * humanname; /* Its fun name, like "mail exchanger" */ |
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| 109 | }; |
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| 110 | |
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| 111 | /* |
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| 112 | * Global defines and variables for resolver stub. |
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| 113 | */ |
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| 114 | #define MAXNS 3 /* max # name servers we'll track */ |
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| 115 | #define MAXDFLSRCH 3 /* # default domain levels to try */ |
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| 116 | #define MAXDNSRCH 6 /* max # domains in search path */ |
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| 117 | #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ |
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| 118 | |
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| 119 | #define RES_TIMEOUT 5 /* min. seconds between retries */ |
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| 120 | #define MAXRESOLVSORT 10 /* number of net to sort on */ |
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| 121 | #define RES_MAXNDOTS 15 /* should reflect bit field size */ |
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| 122 | #define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */ |
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| 123 | #define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */ |
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| 124 | #define RES_DFLRETRY 2 /* Default #/tries. */ |
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| 125 | #define RES_MAXTIME 65535 /* Infinity, in milliseconds. */ |
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| 126 | |
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| 127 | struct __res_state { |
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| 128 | int retrans; /* retransmition time interval */ |
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| 129 | int retry; /* number of times to retransmit */ |
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| 130 | u_long options; /* option flags - see below. */ |
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| 131 | int nscount; /* number of name servers */ |
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| 132 | struct sockaddr_in |
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| 133 | nsaddr_list[MAXNS]; /* address of name server */ |
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| 134 | #define nsaddr nsaddr_list[0] /* for backward compatibility */ |
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| 135 | u_short id; /* current message id */ |
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| 136 | char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ |
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| 137 | char defdname[256]; /* default domain (deprecated) */ |
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| 138 | u_long pfcode; /* RES_PRF_ flags - see below. */ |
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| 139 | unsigned ndots:4; /* threshold for initial abs. query */ |
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| 140 | unsigned nsort:4; /* number of elements in sort_list[] */ |
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| 141 | char unused[3]; |
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| 142 | struct { |
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| 143 | struct in_addr addr; |
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| 144 | u_int32_t mask; |
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| 145 | } sort_list[MAXRESOLVSORT]; |
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| 146 | res_send_qhook qhook; /* query hook */ |
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| 147 | res_send_rhook rhook; /* response hook */ |
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| 148 | int res_h_errno; /* last one set for this context */ |
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| 149 | int _vcsock; /* PRIVATE: for res_send VC i/o */ |
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| 150 | u_int _flags; /* PRIVATE: see below */ |
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| 151 | union { |
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| 152 | char pad[52]; /* On an i386 this means 512b total. */ |
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| 153 | struct { |
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| 154 | u_int16_t nscount; |
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| 155 | u_int16_t nstimes[MAXNS]; /* ms. */ |
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| 156 | int nssocks[MAXNS]; |
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| 157 | u_int16_t nscount6; |
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| 158 | u_int16_t nsinit; |
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| 159 | struct sockaddr_in6 *nsaddrs[MAXNS]; |
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| 160 | } _ext; |
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| 161 | } _u; |
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| 162 | }; |
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| 163 | |
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| 164 | typedef struct __res_state *res_state; |
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| 165 | |
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| 166 | /* |
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| 167 | * Resolver flags (used to be discrete per-module statics ints). |
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| 168 | */ |
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| 169 | #define RES_F_VC 0x00000001 /* socket is TCP */ |
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| 170 | #define RES_F_CONN 0x00000002 /* socket is connected */ |
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| 171 | |
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| 172 | /* res_findzonecut() options */ |
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| 173 | #define RES_EXHAUSTIVE 0x00000001 /* always do all queries */ |
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| 174 | |
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| 175 | /* |
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| 176 | * Resolver options (keep these in synch with res_debug.c, please) |
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| 177 | */ |
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| 178 | #define RES_INIT 0x00000001 /* address initialized */ |
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| 179 | #define RES_DEBUG 0x00000002 /* print debug messages */ |
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| 180 | #define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/ |
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| 181 | #define RES_USEVC 0x00000008 /* use virtual circuit */ |
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| 182 | #define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */ |
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| 183 | #define RES_IGNTC 0x00000020 /* ignore trucation errors */ |
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| 184 | #define RES_RECURSE 0x00000040 /* recursion desired */ |
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| 185 | #define RES_DEFNAMES 0x00000080 /* use default domain name */ |
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| 186 | #define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ |
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| 187 | #define RES_DNSRCH 0x00000200 /* search up local domain tree */ |
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| 188 | #define RES_INSECURE1 0x00000400 /* type 1 security disabled */ |
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| 189 | #define RES_INSECURE2 0x00000800 /* type 2 security disabled */ |
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| 190 | #define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */ |
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| 191 | #define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */ |
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| 192 | #define RES_ROTATE 0x00004000 /* rotate ns list after each query */ |
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| 193 | #define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */ |
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| 194 | #define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */ |
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| 195 | #define RES_BLAST 0x00020000 /* blast all recursive servers */ |
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| 196 | |
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| 197 | #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) |
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| 198 | |
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| 199 | /* |
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| 200 | * Resolver "pfcode" values. Used by dig. |
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| 201 | */ |
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| 202 | #define RES_PRF_STATS 0x00000001 |
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| 203 | #define RES_PRF_UPDATE 0x00000002 |
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| 204 | #define RES_PRF_CLASS 0x00000004 |
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| 205 | #define RES_PRF_CMD 0x00000008 |
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| 206 | #define RES_PRF_QUES 0x00000010 |
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| 207 | #define RES_PRF_ANS 0x00000020 |
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| 208 | #define RES_PRF_AUTH 0x00000040 |
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| 209 | #define RES_PRF_ADD 0x00000080 |
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| 210 | #define RES_PRF_HEAD1 0x00000100 |
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| 211 | #define RES_PRF_HEAD2 0x00000200 |
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| 212 | #define RES_PRF_TTLID 0x00000400 |
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| 213 | #define RES_PRF_HEADX 0x00000800 |
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| 214 | #define RES_PRF_QUERY 0x00001000 |
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| 215 | #define RES_PRF_REPLY 0x00002000 |
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| 216 | #define RES_PRF_INIT 0x00004000 |
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| 217 | /* 0x00008000 */ |
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| 218 | |
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| 219 | /* Internal (static) resolver context. */ |
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| 220 | extern struct __res_state _res; |
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| 221 | |
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| 222 | #ifndef __BIND_NOSTATIC |
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| 223 | |
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| 224 | #define fp_nquery __fp_nquery |
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| 225 | #define fp_query __fp_query |
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| 226 | #define hostalias __hostalias |
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| 227 | #define p_query __p_query |
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| 228 | #define res_close __res_close |
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| 229 | #define res_init __res_init |
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| 230 | #define res_isourserver __res_isourserver |
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| 231 | #define res_mkquery __res_mkquery |
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| 232 | #define res_query __res_query |
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| 233 | #define res_querydomain __res_querydomain |
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| 234 | #define res_search __res_search |
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| 235 | #define res_send __res_send |
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| 236 | |
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| 237 | __BEGIN_DECLS |
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| 238 | void fp_nquery __P((const u_char *, int, FILE *)); |
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| 239 | void fp_query __P((const u_char *, FILE *)); |
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| 240 | const char * hostalias __P((const char *)); |
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| 241 | void p_query __P((const u_char *)); |
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| 242 | void res_close __P((void)); |
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| 243 | int res_init __P((void)); |
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| 244 | int res_isourserver __P((const struct sockaddr_in *)); |
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| 245 | int res_mkquery __P((int, const char *, int, int, const u_char *, |
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| 246 | int, const u_char *, u_char *, int)); |
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| 247 | int res_query __P((const char *, int, int, u_char *, int)); |
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| 248 | int res_querydomain __P((const char *, const char *, int, int, |
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| 249 | u_char *, int)); |
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| 250 | int res_search __P((const char *, int, int, u_char *, int)); |
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| 251 | int res_send __P((const u_char *, int, u_char *, int)); |
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| 252 | __END_DECLS |
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| 253 | |
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| 254 | #endif /* !__BIND_NOSTATIC */ |
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| 255 | |
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| 256 | |
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| 257 | #if !defined(SHARED_LIBBIND) || defined(LIB) |
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| 258 | /* |
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| 259 | * If libbind is a shared object (well, DLL anyway) |
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| 260 | * these externs break the linker when resolv.h is |
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| 261 | * included by a lib client (like named) |
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| 262 | * Make them go away if a client is including this |
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| 263 | * |
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| 264 | */ |
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| 265 | extern const struct res_sym __p_key_syms[]; |
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| 266 | extern const struct res_sym __p_cert_syms[]; |
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| 267 | extern const struct res_sym __p_class_syms[]; |
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| 268 | extern const struct res_sym __p_type_syms[]; |
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| 269 | extern const struct res_sym __p_rcode_syms[]; |
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| 270 | #endif /* SHARED_LIBBIND */ |
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| 271 | |
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| 272 | #define b64_ntop __b64_ntop |
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| 273 | #define b64_pton __b64_pton |
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| 274 | #define dn_comp __dn_comp |
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| 275 | #define dn_count_labels __dn_count_labels |
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| 276 | #define dn_expand __dn_expand |
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| 277 | #define dn_skipname __dn_skipname |
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| 278 | #define fp_resstat __fp_resstat |
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| 279 | #define loc_aton __loc_aton |
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| 280 | #define loc_ntoa __loc_ntoa |
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| 281 | #define p_cdname __p_cdname |
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| 282 | #define p_cdnname __p_cdnname |
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| 283 | #define p_class __p_class |
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| 284 | #define p_fqname __p_fqname |
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| 285 | #define p_fqnname __p_fqnname |
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| 286 | #define p_option __p_option |
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| 287 | #define p_secstodate __p_secstodate |
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| 288 | #define p_section __p_section |
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| 289 | #define p_time __p_time |
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| 290 | #define p_type __p_type |
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| 291 | #define p_rcode __p_rcode |
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| 292 | #define putlong __putlong |
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| 293 | #define putshort __putshort |
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| 294 | #define res_dnok __res_dnok |
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| 295 | #define res_hnok __res_hnok |
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| 296 | #define res_hostalias __res_hostalias |
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| 297 | #define res_mailok __res_mailok |
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| 298 | #define res_nameinquery __res_nameinquery |
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| 299 | #define res_nclose __res_nclose |
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| 300 | #define res_ninit __res_ninit |
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| 301 | #define res_nmkquery __res_nmkquery |
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| 302 | #define res_npquery __res_npquery |
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| 303 | #define res_nquery __res_nquery |
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| 304 | #define res_nquerydomain __res_nquerydomain |
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| 305 | #define res_nsearch __res_nsearch |
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| 306 | #define res_nsend __res_nsend |
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| 307 | #define res_nisourserver __res_nisourserver |
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| 308 | #define res_ownok __res_ownok |
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| 309 | #define res_queriesmatch __res_queriesmatch |
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| 310 | #define res_randomid __res_randomid |
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| 311 | #define sym_ntop __sym_ntop |
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| 312 | #define sym_ntos __sym_ntos |
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| 313 | #define sym_ston __sym_ston |
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| 314 | __BEGIN_DECLS |
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| 315 | int res_hnok __P((const char *)); |
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| 316 | int res_ownok __P((const char *)); |
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| 317 | int res_mailok __P((const char *)); |
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| 318 | int res_dnok __P((const char *)); |
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| 319 | int sym_ston __P((const struct res_sym *, const char *, int *)); |
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| 320 | const char * sym_ntos __P((const struct res_sym *, int, int *)); |
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| 321 | const char * sym_ntop __P((const struct res_sym *, int, int *)); |
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| 322 | int b64_ntop __P((u_char const *, size_t, char *, size_t)); |
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| 323 | int b64_pton __P((char const *, u_char *, size_t)); |
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| 324 | int loc_aton __P((const char *ascii, u_char *binary)); |
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| 325 | const char * loc_ntoa __P((const u_char *binary, char *ascii)); |
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| 326 | int dn_skipname __P((const u_char *, const u_char *)); |
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| 327 | void putlong __P((u_int32_t, u_char *)); |
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| 328 | void putshort __P((u_int16_t, u_char *)); |
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| 329 | const char * p_class __P((int)); |
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| 330 | const char * p_time __P((u_int32_t)); |
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| 331 | const char * p_type __P((int)); |
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| 332 | const char * p_rcode __P((int)); |
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| 333 | const u_char * p_cdnname __P((const u_char *, const u_char *, int, FILE *)); |
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| 334 | const u_char * p_cdname __P((const u_char *, const u_char *, FILE *)); |
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| 335 | const u_char * p_fqnname __P((const u_char *cp, const u_char *msg, |
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| 336 | int, char *, int)); |
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| 337 | const u_char * p_fqname __P((const u_char *, const u_char *, FILE *)); |
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| 338 | const char * p_option __P((u_long option)); |
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| 339 | char * p_secstodate __P((u_long)); |
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| 340 | int dn_count_labels __P((const char *)); |
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| 341 | int dn_comp __P((const char *, u_char *, int, |
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| 342 | u_char **, u_char **)); |
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| 343 | int dn_expand __P((const u_char *, const u_char *, const u_char *, |
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| 344 | char *, int)); |
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| 345 | u_int res_randomid __P((void)); |
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| 346 | int res_nameinquery __P((const char *, int, int, |
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| 347 | const u_char *, const u_char *)); |
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| 348 | int res_queriesmatch __P((const u_char *, const u_char *, |
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| 349 | const u_char *, const u_char *)); |
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| 350 | const char * p_section __P((int section, int opcode)); |
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| 351 | /* Things involving a resolver context. */ |
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| 352 | int res_ninit __P((res_state)); |
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| 353 | int res_nisourserver __P((const res_state, |
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| 354 | const struct sockaddr_in *)); |
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| 355 | void fp_resstat __P((const res_state, FILE *)); |
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| 356 | void res_npquery __P((const res_state, const u_char *, int, FILE *)); |
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| 357 | const char * res_hostalias __P((const res_state, const char *, |
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| 358 | char *, size_t)); |
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| 359 | int res_nquery __P((res_state, |
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| 360 | const char *, int, int, u_char *, int)); |
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| 361 | int res_nsearch __P((res_state, const char *, int, |
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| 362 | int, u_char *, int)); |
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| 363 | int res_nquerydomain __P((res_state, |
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| 364 | const char *, const char *, int, int, |
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| 365 | u_char *, int)); |
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| 366 | int res_nmkquery __P((res_state, |
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| 367 | int, const char *, int, int, const u_char *, |
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| 368 | int, const u_char *, u_char *, int)); |
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| 369 | int res_nsend __P((res_state, const u_char *, int, u_char *, int)); |
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| 370 | void res_nclose __P((res_state)); |
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| 371 | __END_DECLS |
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| 372 | |
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| 373 | #endif /* !_RESOLV_H_ */ |
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