/*

@doc

@module resolv.h |
 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California.
 * All rights reserved. <nl>

  Structure definitions for resolver functions and #define statements

*/

/*
 * Copyright (c) 1983, 1987, 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)resolv.h    5.15 (Berkeley) 4/3/91
 */

#ifndef _RESOLV_H_
#define _RESOLV_H_

#if defined(_WINDOWS) || defined(_WIN32)
#include <windows.h>
#include <decldll.h>
#endif

/*
 * 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
#if defined(_WINDOWS) || defined(_WIN32)
#define _PATH_RESCONF        "c:\\net\\tcp\\resolv.cfg"
#else
#define _PATH_RESCONF        "/etc/resolv.conf"
#endif
#endif

#ifndef MAXDNAME
#include <arpa/nameser.h>
#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 */

// new
#define MAXMXRECS               8

struct mxent {
    int numrecs;
    u_short pref[MAXMXRECS];
    char FAR * FAR * hostname;
};


/*

  @struct state | This structure holds the state for the resolver query

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

#if defined(_WINDOWS) || defined(_WIN32)

#ifdef __cplusplus
extern "C" {
#endif

EXPORT32 int  EXPORT WINAPI res_init();
EXPORT32 void EXPORT WINAPI res_setopts(long opts);
EXPORT32 long EXPORT WINAPI res_getopts(void);
EXPORT32 int  EXPORT WINAPI res_mkquery(int op, const char FAR *dname, 
                                        int qclass, int type, 
                                        const char FAR *data, int datalen, 
                                        const struct rrec FAR *newrr,
                                        char FAR *buf, int buflen);
EXPORT32 int  EXPORT WINAPI res_send(const char FAR *msg, int msglen, 
                                     char FAR *answer, int anslen);
EXPORT32 int  EXPORT WINAPI res_querydomain(const char FAR *name, 
                                            const char FAR *domain, 
                                            int qclass, int type, 
                                            u_char FAR *answer, int anslen);
EXPORT32 int  EXPORT WINAPI res_search(const char FAR *name, 
                                       int qclass, int type, 
                                       u_char FAR *answer, int anslen);

EXPORT32 int  EXPORT WINAPI dn_comp(const u_char FAR *exp_dn, 
                                    u_char FAR *comp_dn, 
                                    int length, u_char FAR * FAR *dnptrs, 
                                    u_char FAR * FAR *lastdnptr);
EXPORT32 int  EXPORT WINAPI rdn_expand(const u_char FAR *msg, 
                                      const u_char FAR *eomorig, 
                                      const u_char FAR *comp_dn, 
                                      u_char FAR *exp_dn, 
                                      int length);
/* Microsoft includes an implementation of dn_expand() in winsock */
/* Make sure we do not use it.  jaltman@columbia.edu              */
#define dn_expand(a,b,c,d,e) rdn_expand(a,b,c,d,e)

#ifdef __cplusplus
}
#endif
#else
__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      rdn_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
#endif /* _WINDOWS || _WIN32 */

#endif /* !_RESOLV_H_ */
