1 /* 2 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)resolv.h 5.15 (Berkeley) 04/03/91 8 */ 9 10 #ifndef _RESOLV_H_ 11 #define _RESOLV_H_ 12 13 /* 14 * Resolver configuration file. 15 * Normally not present, but may contain the address of the 16 * inital name server(s) to query and the domain search list. 17 */ 18 19 #ifndef _PATH_RESCONF 20 #define _PATH_RESCONF "/etc/resolv.conf" 21 #endif 22 23 /* 24 * Global defines and variables for resolver stub. 25 */ 26 #define MAXNS 3 /* max # name servers we'll track */ 27 #define MAXDFLSRCH 3 /* # default domain levels to try */ 28 #define MAXDNSRCH 6 /* max # domains in search path */ 29 #define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */ 30 31 #define RES_TIMEOUT 5 /* min. seconds between retries */ 32 33 struct state { 34 int retrans; /* retransmition time interval */ 35 int retry; /* number of times to retransmit */ 36 long options; /* option flags - see below. */ 37 int nscount; /* number of name servers */ 38 struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */ 39 #define nsaddr nsaddr_list[0] /* for backward compatibility */ 40 u_short id; /* current packet id */ 41 char defdname[MAXDNAME]; /* default domain */ 42 char *dnsrch[MAXDNSRCH+1]; /* components of domain to search */ 43 }; 44 45 /* 46 * Resolver options 47 */ 48 #define RES_INIT 0x0001 /* address initialized */ 49 #define RES_DEBUG 0x0002 /* print debug messages */ 50 #define RES_AAONLY 0x0004 /* authoritative answers only */ 51 #define RES_USEVC 0x0008 /* use virtual circuit */ 52 #define RES_PRIMARY 0x0010 /* query primary server only */ 53 #define RES_IGNTC 0x0020 /* ignore trucation errors */ 54 #define RES_RECURSE 0x0040 /* recursion desired */ 55 #define RES_DEFNAMES 0x0080 /* use default domain name */ 56 #define RES_STAYOPEN 0x0100 /* Keep TCP socket open */ 57 #define RES_DNSRCH 0x0200 /* search up local domain tree */ 58 59 #define RES_DEFAULT (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH) 60 61 extern struct state _res; 62 63 #include <sys/cdefs.h> 64 #include <stdio.h> 65 66 /* Private routines shared between libc/net, named, nslookup and others. */ 67 #define dn_skipname __dn_skipname 68 #define fp_query __fp_query 69 #define hostalias __hostalias 70 #define putlong __putlong 71 #define putshort __putshort 72 #define p_class __p_class 73 #define p_time __p_time 74 #define p_type __p_type 75 __BEGIN_DECLS 76 int __dn_skipname __P((const u_char *, const u_char *)); 77 void __fp_query __P((char *, FILE *)); 78 char *__hostalias __P((const char *)); 79 void __putlong __P((u_long, u_char *)); 80 void __putshort __P((u_short, u_char *)); 81 char *__p_class __P((int)); 82 char *__p_time __P((u_long)); 83 char *__p_type __P((int)); 84 85 int dn_comp __P((const u_char *, u_char *, int, u_char **, u_char **)); 86 int dn_expand __P((const u_char *, const u_char *, const u_char *, 87 u_char *, int)); 88 int res_init __P((void)); 89 int res_mkquery __P((int, const char *, int, int, const char *, int, 90 const struct rrec *, char *, int)); 91 int res_send __P((const char *, int, char *, int)); 92 __END_DECLS 93 94 #endif /* !_RESOLV_H_ */ 95