resolv.h revision 3070
1/*- 2 * Copyright (c) 1983, 1987, 1989, 1993 3 * The Regents of the University of California. 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 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * - 34 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 35 * 36 * Permission to use, copy, modify, and distribute this software for any 37 * purpose with or without fee is hereby granted, provided that the above 38 * copyright notice and this permission notice appear in all copies, and that 39 * the name of Digital Equipment Corporation not be used in advertising or 40 * publicity pertaining to distribution of the document or software without 41 * specific, written prior permission. 42 * 43 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 44 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 45 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 46 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 47 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 48 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 49 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 50 * SOFTWARE. 51 * - 52 * --Copyright-- 53 * 54 * @(#)resolv.h 8.1 (Berkeley) 6/2/93 55 * From Id: resolv.h,v 4.9.1.2 1993/05/17 09:59:01 vixie Exp 56 * $Id$ 57 */ 58 59#ifndef _RESOLV_H_ 60#define _RESOLV_H_ 61 62#include <sys/param.h> 63#include <sys/types.h> 64#include <sys/cdefs.h> 65#include <stdio.h> 66 67/* 68 * revision information. this is the release date in YYYYMMDD format. 69 * it can change every day so the right thing to do with it is use it 70 * in preprocessor commands such as "#if (__RES > 19931104)". do not 71 * compare for equality; rather, use it to determine whether your resolver 72 * is new enough to contain a certain feature. 73 */ 74 75#define __RES 19940415 76 77/* 78 * Resolver configuration file. 79 * Normally not present, but may contain the address of the 80 * inital name server(s) to query and the domain search list. 81 */ 82 83#ifndef _PATH_RESCONF 84#define _PATH_RESCONF "/etc/resolv.conf" 85#endif 86 87/* 88 * Global defines and variables for resolver stub. 89 */ 90#define MAXNS 3 /* max # name servers we'll track */ 91#define MAXDFLSRCH 3 /* # default domain levels to try */ 92#define MAXDNSRCH 6 /* max # domains in search path */ 93#define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 94 95#define RES_TIMEOUT 5 /* min. seconds between retries */ 96#define MAXRESOLVSORT 10 /* number of net to sort on */ 97#define RES_MAXNDOTS 15 /* should reflect bit field size */ 98 99struct __res_state { 100 int retrans; /* retransmition time interval */ 101 int retry; /* number of times to retransmit */ 102 u_long options; /* option flags - see below. */ 103 int nscount; /* number of name servers */ 104 struct sockaddr_in 105 nsaddr_list[MAXNS]; /* address of name server */ 106#define nsaddr nsaddr_list[0] /* for backward compatibility */ 107 u_short id; /* current packet id */ 108 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 109 char defdname[MAXDNAME]; /* default domain */ 110 u_long pfcode; /* RES_PRF_ flags - see below. */ 111 unsigned ndots:4; /* threshold for initial abs. query */ 112 unsigned nsort:4; /* number of elements in sort_list[] */ 113 char unused[3]; 114 struct { 115 struct in_addr addr; 116 u_int32_t mask; 117 } sort_list[MAXRESOLVSORT]; 118}; 119 120/* 121 * Resolver options (keep these in synch with res_debug.c, please) 122 */ 123#define RES_INIT 0x00000001 /* address initialized */ 124#define RES_DEBUG 0x00000002 /* print debug messages */ 125#define RES_AAONLY 0x00000004 /* authoritative answers only */ 126#define RES_USEVC 0x00000008 /* use virtual circuit */ 127#define RES_PRIMARY 0x00000010 /* query primary server only */ 128#define RES_IGNTC 0x00000020 /* ignore trucation errors */ 129#define RES_RECURSE 0x00000040 /* recursion desired */ 130#define RES_DEFNAMES 0x00000080 /* use default domain name */ 131#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */ 132#define RES_DNSRCH 0x00000200 /* search up local domain tree */ 133#define RES_INSECURE1 0x00000400 /* type 1 security disabled */ 134#define RES_INSECURE2 0x00000800 /* type 2 security disabled */ 135 136#define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 137 138/* 139 * Resolver "pfcode" values. Used by dig. 140 */ 141#define RES_PRF_STATS 0x00000001 142/* 0x00000002 */ 143#define RES_PRF_CLASS 0x00000004 144#define RES_PRF_CMD 0x00000008 145#define RES_PRF_QUES 0x00000010 146#define RES_PRF_ANS 0x00000020 147#define RES_PRF_AUTH 0x00000040 148#define RES_PRF_ADD 0x00000080 149#define RES_PRF_HEAD1 0x00000100 150#define RES_PRF_HEAD2 0x00000200 151#define RES_PRF_TTLID 0x00000400 152#define RES_PRF_HEADX 0x00000800 153#define RES_PRF_QUERY 0x00001000 154#define RES_PRF_REPLY 0x00002000 155#define RES_PRF_INIT 0x00004000 156/* 0x00008000 */ 157 158/* hooks are still experimental as of 4.9.2 */ 159typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error } 160 res_sendhookact; 161 162typedef res_sendhookact (*res_send_qhook)__P((struct sockaddr_in * const *ns, 163 const u_char **query, 164 int *querylen, 165 u_char *ans, 166 int anssiz, 167 int *resplen)); 168 169typedef res_sendhookact (*res_send_rhook)__P((const struct sockaddr_in *ns, 170 const u_char *query, 171 int querylen, 172 u_char *ans, 173 int anssiz, 174 int *resplen)); 175 176extern struct __res_state _res; 177 178/* Private routines shared between libc/net, named, nslookup and others. */ 179#define dn_skipname __dn_skipname 180#define fp_query __fp_query 181#define fp_nquery __fp_nquery 182#define hostalias __hostalias 183#define putlong __putlong 184#define putshort __putshort 185#define p_class __p_class 186#define p_time __p_time 187#define p_type __p_type 188#define p_cdnname __p_cdnname 189#define p_cdname __p_cdname 190#define p_fqname __p_fqname 191#define p_rr __p_rr 192#define p_option __p_option 193 194__BEGIN_DECLS 195int __dn_skipname __P((const u_char *, const u_char *)); 196void __fp_resstat __P((struct __res_state *, FILE *)); 197void __fp_query __P((const u_char *, FILE *)); 198void __fp_nquery __P((const u_char *, int, FILE *)); 199char *__hostalias __P((const char *)); 200void __putlong __P((u_int32_t, u_char *)); 201void __putshort __P((u_int16_t, u_char *)); 202char *__p_time __P((u_int32_t)); 203void __p_query __P((const u_char *)); 204const u_char *__p_cdnname __P((const u_char *, const u_char *, int, FILE *)); 205const u_char *__p_cdname __P((const u_char *, const u_char *, FILE *)); 206const u_char *__p_fqname __P((const u_char *, const u_char *, FILE *)); 207const u_char *__p_rr __P((const u_char *, const u_char *, FILE *)); 208const char *__p_type __P((int)); 209const char *__p_class __P((int)); 210const char *__p_option __P((u_long option)); 211int dn_comp __P((const char *, u_char *, int, u_char **, u_char **)); 212int dn_expand __P((const u_char *, const u_char *, const u_char *, 213 char *, int)); 214int res_init __P((void)); 215int res_query __P((const char *, int, int, u_char *, int)); 216int res_search __P((const char *, int, int, u_char *, int)); 217int res_querydomain __P((const char *, const char *, int, int, 218 u_char *, int)); 219int res_mkquery __P((int, const char *, int, int, const u_char *, int, 220 const u_char *, u_char *, int)); 221int res_send __P((const u_char *, int, u_char *, int)); 222__END_DECLS 223 224#endif /* !_RESOLV_H_ */ 225