1 /* 2 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California. 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 * 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 * @(#)resolv.h 5.15 (Berkeley) 4/3/91 34 */ 35 36 #ifndef _RESOLV_H_ 37 #define _RESOLV_H_ 38 39 /* 40 * Resolver configuration file. 41 * Normally not present, but may contain the address of the 42 * inital name server(s) to query and the domain search list. 43 */ 44 45 #ifndef _PATH_RESCONF 46 #define _PATH_RESCONF "/etc/resolv.conf" 47 #endif 48 49 /* 50 * Global defines and variables for resolver stub. 51 */ 52 #define MAXNS 3 /* max # name servers we'll track */ 53 #define MAXDFLSRCH 3 /* # default domain levels to try */ 54 #define MAXDNSRCH 6 /* max # domains in search path */ 55 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 56 57 #define RES_TIMEOUT 5 /* min. seconds between retries */ 58 59 struct state { 60 int retrans; /* retransmition time interval */ 61 int retry; /* number of times to retransmit */ 62 long options; /* option flags - see below. */ 63 int nscount; /* number of name servers */ 64 struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */ 65 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 66 u_short id; /* current packet id */ 67 char defdname[MAXDNAME]; /* default domain */ 68 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 69 }; 70 71 /* 72 * Resolver options 73 */ 74 #define RES_INIT 0x0001 /* address initialized */ 75 #define RES_DEBUG 0x0002 /* print debug messages */ 76 #define RES_AAONLY 0x0004 /* authoritative answers only */ 77 #define RES_USEVC 0x0008 /* use virtual circuit */ 78 #define RES_PRIMARY 0x0010 /* query primary server only */ 79 #define RES_IGNTC 0x0020 /* ignore trucation errors */ 80 #define RES_RECURSE 0x0040 /* recursion desired */ 81 #define RES_DEFNAMES 0x0080 /* use default domain name */ 82 #define RES_STAYOPEN 0x0100 /* Keep TCP socket open */ 83 #define RES_DNSRCH 0x0200 /* search up local domain tree */ 84 85 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 86 87 extern struct state _res; 88 89 #include <sys/cdefs.h> 90 #include <stdio.h> 91 92 /* Private routines shared between libc/net, named, nslookup and others. */ 93 #define dn_skipname __dn_skipname 94 #define fp_query __fp_query 95 #define hostalias __hostalias 96 #define putlong __putlong 97 #define putshort __putshort 98 #define p_class __p_class 99 #define p_time __p_time 100 #define p_type __p_type 101 __BEGIN_DECLS 102 int __dn_skipname __P((const u_char *, const u_char *)); 103 void __fp_query __P((char *, FILE *)); 104 char *__hostalias __P((const char *)); 105 void __putlong __P((u_long, u_char *)); 106 void __putshort __P((u_short, u_char *)); 107 char *__p_class __P((int)); 108 char *__p_time __P((u_long)); 109 char *__p_type __P((int)); 110 111 int dn_comp __P((const u_char *, u_char *, int, u_char **, u_char **)); 112 int dn_expand __P((const u_char *, const u_char *, const u_char *, 113 u_char *, int)); 114 int res_init __P((void)); 115 int res_mkquery __P((int, const char *, int, int, const char *, int, 116 const struct rrec *, char *, int)); 117 int res_send __P((const char *, int, char *, int)); 118 __END_DECLS 119 120 #endif /* !_RESOLV_H_ */ 121