usr/src/include/resolv.h

/*
 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)resolv.h    5.14 (Berkeley) %G%
 */

/*
 * Resolver configuration file.
 * Normally not present, but may contain the address of the
 * inital name server(s) to query and the domain search list.
 */

#ifndef _PATH_RESCONF
#define _PATH_RESCONF        "/etc/resolv.conf"
#endif

/*
 * Global defines and variables for resolver stub.
 */
#define MAXNS                   3       /* max # name servers we'll track */
#define MAXDFLSRCH              3       /* # default domain levels to try */
#define MAXDNSRCH               6       /* max # domains in search path */
#define LOCALDOMAINPARTS        2       /* min levels in name that is "local" */

#define RES_TIMEOUT             5       /* min. seconds between retries */

struct state {
        int     retrans;                /* retransmition time interval */
        int     retry;                  /* number of times to retransmit */
        long    options;                /* option flags - see below. */
        int     nscount;                /* number of name servers */
        struct  sockaddr_in nsaddr_list[MAXNS]; /* address of name server */
#define nsaddr  nsaddr_list[0]          /* for backward compatibility */
        u_short id;                     /* current packet id */
        char    defdname[MAXDNAME];     /* default domain */
        char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
};

/*
 * Resolver options
 */
#define RES_INIT        0x0001          /* address initialized */
#define RES_DEBUG       0x0002          /* print debug messages */
#define RES_AAONLY      0x0004          /* authoritative answers only */
#define RES_USEVC       0x0008          /* use virtual circuit */
#define RES_PRIMARY     0x0010          /* query primary server only */
#define RES_IGNTC       0x0020          /* ignore trucation errors */
#define RES_RECURSE     0x0040          /* recursion desired */
#define RES_DEFNAMES    0x0080          /* use default domain name */
#define RES_STAYOPEN    0x0100          /* Keep TCP socket open */
#define RES_DNSRCH      0x0200          /* search up local domain tree */

#define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)

extern struct state _res;

#include <sys/cdefs.h>
#include <stdio.h>

/* Private routines shared between libc/net, named, nslookup and others. */
#define dn_skipname     __dn_skipname
#define fp_query        __fp_query
#define hostalias       __hostalias
#define putlong         __putlong
#define putshort        __putshort
#define p_class         __p_class
#define p_time          __p_time
#define p_type          __p_type
__BEGIN_DECLS
int      __dn_skipname __P((const u_char *, const u_char *));
void     __fp_query __P((char *, FILE *));
char    *__hostalias __P((const char *));
void     __putlong __P((u_long, u_char *));
void     __putshort __P((u_short, u_char *));
char    *__p_class __P((int));
char    *__p_time __P((u_long));
char    *__p_type __P((int));

int      dn_comp __P((const u_char *, u_char *, int, u_char **, u_char **));
int      dn_expand __P((const u_char *, const u_char *, const u_char *,
                u_char *, int));
int      res_init __P((void));
int      res_mkquery __P((int, const char *, int, int, const char *, int,
                const struct rrec *, char *, int));
int      res_send __P((const char *, int, char *, int));
__END_DECLS