src/include/net/gen/resolv.h

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/*
 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. Neither the name of the University nor the names of its
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)resolv.h    5.10 (Berkeley) 6/1/90
 */
#ifndef _NET__GEN__RESOLV_H
#define _NET__GEN__RESOLV_H

/*
 * 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 */

#define NAMESERVER_PORT 53

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 */
        ipaddr_t nsaddr_list[MAXNS];    /* address of name server */
#define nsaddr  nsaddr_list[0]          /* for backward compatibility */
        u16_t   nsport_list[MAXNS];     /* port of name server */
        u16_t   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;

struct rrec;

int res_init _ARGS(( void ));
int res_mkquery _ARGS(( int op, const char *dname, int class, int type,
        const char *data, int datalen, const struct rrec *newrr,
        char *buf, int buflen ));
int res_query _ARGS(( char *name, int class, int type, u8_t *answer, 
        int anslen ));
int res_querydomain _ARGS(( char *name, char *domain, int class, int type, 
        u8_t *answer, int anslen ));
int res_search _ARGS(( char *name, int class, int type, u8_t *answer, 
        int anslen ));
int res_send _ARGS(( const char *buf, int buflen, char *answer, int anslen ));
void _res_close _ARGS(( void ));

int dn_comp _ARGS(( const u8_t *exp_dn, u8_t *comp_dn, int length, 
        u8_t **dnptrs, u8_t **lastdnptr ));
int dn_expand  _ARGS(( const u8_t *msg, const u8_t *eomorig,
        const u8_t *comp_dn, u8_t *exp_dn, int length ));
int dn_skipname _ARGS(( const u8_t *comp_dn, const u8_t *eom ));

char *__hostalias _ARGS(( const char *name ));

u16_t _getshort _ARGS(( const u8_t *msgp ));
u32_t _getlong _ARGS(( const u8_t *msgp ));
void __putshort _ARGS(( U16_t s, u8_t *msgp ));
void __putlong _ARGS(( u32_t l, u8_t *msgp ));

void p_query _ARGS(( char *msg ));

#endif /* _NET__GEN__RESOLV_H */

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