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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, 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.

 * 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.

 */

/*

 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 */

/*

 *      @(#)resolv.h    8.1 (Berkeley) 6/2/93

 *      $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $

 */

#ifndef _RESOLV_H_

#define _RESOLV_H_

#include <sys/param.h>

#if (!defined(BSD)) || (BSD < 199306)

# include <sys/bitypes.h>

#else

# include <sys/types.h>

#endif

#include <sys/cdefs.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/nameser.h>

/*

 * Revision information.  This is the release date in YYYYMMDD format.

 * It can change every day so the right thing to do with it is use it

 * in preprocessor commands such as "#if (__RES > 19931104)".  Do not

 * compare for equality; rather, use it to determine whether your resolver

 * is new enough to contain a certain feature.

 */

/* #define      __RES   19991006 we don't have a new resolver yet */

#define __RES   19960801

/*

 * 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

typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }

        res_sendhookact;

typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,

                                           const u_char **query,

                                           int *querylen,

                                           u_char *ans,

                                           int anssiz,

                                           int *resplen);

typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,

                                           const u_char *query,

                                           int querylen,

                                           u_char *ans,

                                           int anssiz,

                                           int *resplen);

struct res_sym {

        int     number;         /* Identifying number, like T_MX */

        char *  name;           /* Its symbolic name, like "MX" */

        char *  humanname;      /* Its fun name, like "mail exchanger" */

};

/*

 * 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 MAXRESOLVSORT           10      /* number of net to sort on */

#define RES_MAXNDOTS            15      /* should reflect bit field size */

#define RES_MAXRETRANS          30      /* only for resolv.conf/RES_OPTIONS */

#define RES_MAXRETRY            5       /* only for resolv.conf/RES_OPTIONS */

#define RES_DFLRETRY            2       /* Default #/tries. */

#define RES_MAXTIME             65535   /* Infinity, in milliseconds. */

struct __res_state {

        int     retrans;                /* retransmition time interval */

        int     retry;                  /* number of times to retransmit */

        u_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 message id */

        char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */

        char    defdname[256];          /* default domain (deprecated) */

        u_long  pfcode;                 /* RES_PRF_ flags - see below. */

        unsigned ndots:4;               /* threshold for initial abs. query */

        unsigned nsort:4;               /* number of elements in sort_list[] */

        char    unused[3];

        struct {

                struct in_addr  addr;

                u_int32_t       mask;

        } sort_list[MAXRESOLVSORT];

        res_send_qhook qhook;           /* query hook */

        res_send_rhook rhook;           /* response hook */

        int     res_h_errno;            /* last one set for this context */

        int     _vcsock;                /* PRIVATE: for res_send VC i/o */

        u_int   _flags;                 /* PRIVATE: see below */

        union {

                char    pad[52];        /* On an i386 this means 512b total. */

                struct {

                        u_int16_t               nscount;

                        u_int16_t               nstimes[MAXNS]; /* ms. */

                        int                     nssocks[MAXNS];

                        u_int16_t               nscount6;

                        u_int16_t               nsinit;

                        struct sockaddr_in6     *nsaddrs[MAXNS];

                } _ext;

        } _u;

};

typedef struct __res_state *res_state;

/*

 * Resolver flags (used to be discrete per-module statics ints).

 */

#define RES_F_VC        0x00000001      /* socket is TCP */

#define RES_F_CONN      0x00000002      /* socket is connected */

/* res_findzonecut() options */

#define RES_EXHAUSTIVE  0x00000001      /* always do all queries */

/*

 * Resolver options (keep these in synch with res_debug.c, please)

 */

#define RES_INIT        0x00000001      /* address initialized */

#define RES_DEBUG       0x00000002      /* print debug messages */

#define RES_AAONLY      0x00000004      /* authoritative answers only (!IMPL)*/

#define RES_USEVC       0x00000008      /* use virtual circuit */

#define RES_PRIMARY     0x00000010      /* query primary server only (!IMPL) */

#define RES_IGNTC       0x00000020      /* ignore trucation errors */

#define RES_RECURSE     0x00000040      /* recursion desired */

#define RES_DEFNAMES    0x00000080      /* use default domain name */

#define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */

#define RES_DNSRCH      0x00000200      /* search up local domain tree */

#define RES_INSECURE1   0x00000400      /* type 1 security disabled */

#define RES_INSECURE2   0x00000800      /* type 2 security disabled */

#define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */

#define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */

#define RES_ROTATE      0x00004000      /* rotate ns list after each query */

#define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */

#define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */

#define RES_BLAST       0x00020000      /* blast all recursive servers */

#define RES_DEFAULT     (RES_RECURSE | RES_DEFNAMES | RES_DNSRCH)

/*

 * Resolver "pfcode" values.  Used by dig.

 */

#define RES_PRF_STATS   0x00000001

#define RES_PRF_UPDATE  0x00000002

#define RES_PRF_CLASS   0x00000004

#define RES_PRF_CMD     0x00000008

#define RES_PRF_QUES    0x00000010

#define RES_PRF_ANS     0x00000020

#define RES_PRF_AUTH    0x00000040

#define RES_PRF_ADD     0x00000080

#define RES_PRF_HEAD1   0x00000100

#define RES_PRF_HEAD2   0x00000200

#define RES_PRF_TTLID   0x00000400

#define RES_PRF_HEADX   0x00000800

#define RES_PRF_QUERY   0x00001000

#define RES_PRF_REPLY   0x00002000

#define RES_PRF_INIT    0x00004000

/*                      0x00008000      */

/* Internal (static) resolver context. */

extern struct __res_state _res;

#ifndef __BIND_NOSTATIC

#define fp_nquery               __fp_nquery

#define fp_query                __fp_query

#define hostalias               __hostalias

#define p_query                 __p_query

#define res_close               __res_close

#define res_init                __res_init

#define res_isourserver         __res_isourserver

#define res_mkquery             __res_mkquery

#define res_query               __res_query

#define res_querydomain         __res_querydomain

#define res_search              __res_search

#define res_send                __res_send

__BEGIN_DECLS

void            fp_nquery __P((const u_char *, int, FILE *));

void            fp_query __P((const u_char *, FILE *));

const char *    hostalias __P((const char *));

void            p_query __P((const u_char *));

void            res_close __P((void));

int             res_init __P((void));

int             res_isourserver __P((const struct sockaddr_in *));

int             res_mkquery __P((int, const char *, int, int, const u_char *,

                                 int, const u_char *, u_char *, int));

int             res_query __P((const char *, int, int, u_char *, int));

int             res_querydomain __P((const char *, const char *, int, int,

                                     u_char *, int));

int             res_search __P((const char *, int, int, u_char *, int));

int             res_send __P((const u_char *, int, u_char *, int));

__END_DECLS

#endif /* !__BIND_NOSTATIC */

#if !defined(SHARED_LIBBIND) || defined(LIB)

/*

 * If libbind is a shared object (well, DLL anyway)

 * these externs break the linker when resolv.h is

 * included by a lib client (like named)

 * Make them go away if a client is including this

 *

 */

extern const struct res_sym __p_key_syms[];

extern const struct res_sym __p_cert_syms[];

extern const struct res_sym __p_class_syms[];

extern const struct res_sym __p_type_syms[];

extern const struct res_sym __p_rcode_syms[];

#endif /* SHARED_LIBBIND */

#define b64_ntop                __b64_ntop

#define b64_pton                __b64_pton

#define dn_comp                 __dn_comp

#define dn_count_labels         __dn_count_labels

#define dn_expand               __dn_expand

#define dn_skipname             __dn_skipname

#define fp_resstat              __fp_resstat

#define loc_aton                __loc_aton

#define loc_ntoa                __loc_ntoa

#define p_cdname                __p_cdname

#define p_cdnname               __p_cdnname

#define p_class                 __p_class

#define p_fqname                __p_fqname

#define p_fqnname               __p_fqnname

#define p_option                __p_option

#define p_secstodate            __p_secstodate

#define p_section               __p_section

#define p_time                  __p_time

#define p_type                  __p_type

#define p_rcode                 __p_rcode

#define putlong                 __putlong

#define putshort                __putshort

#define res_dnok                __res_dnok

#define res_hnok                __res_hnok

#define res_hostalias           __res_hostalias

#define res_mailok              __res_mailok

#define res_nameinquery         __res_nameinquery

#define res_nclose              __res_nclose

#define res_ninit               __res_ninit

#define res_nmkquery            __res_nmkquery

#define res_npquery             __res_npquery

#define res_nquery              __res_nquery

#define res_nquerydomain        __res_nquerydomain

#define res_nsearch             __res_nsearch

#define res_nsend               __res_nsend

#define res_nisourserver        __res_nisourserver

#define res_ownok               __res_ownok

#define res_queriesmatch        __res_queriesmatch

#define res_randomid            __res_randomid

#define sym_ntop                __sym_ntop

#define sym_ntos                __sym_ntos

#define sym_ston                __sym_ston

__BEGIN_DECLS

int             res_hnok __P((const char *));

int             res_ownok __P((const char *));

int             res_mailok __P((const char *));

int             res_dnok __P((const char *));

int             sym_ston __P((const struct res_sym *, const char *, int *));

const char *    sym_ntos __P((const struct res_sym *, int, int *));

const char *    sym_ntop __P((const struct res_sym *, int, int *));

int             b64_ntop __P((u_char const *, size_t, char *, size_t));

int             b64_pton __P((char const *, u_char *, size_t));

int             loc_aton __P((const char *ascii, u_char *binary));

const char *    loc_ntoa __P((const u_char *binary, char *ascii));

int             dn_skipname __P((const u_char *, const u_char *));

void            putlong __P((u_int32_t, u_char *));

void            putshort __P((u_int16_t, u_char *));

const char *    p_class __P((int));

const char *    p_time __P((u_int32_t));

const char *    p_type __P((int));

const char *    p_rcode __P((int));

const u_char *  p_cdnname __P((const u_char *, const u_char *, int, FILE *));

const u_char *  p_cdname __P((const u_char *, const u_char *, FILE *));

const u_char *  p_fqnname __P((const u_char *cp, const u_char *msg,

                               int, char *, int));

const u_char *  p_fqname __P((const u_char *, const u_char *, FILE *));

const char *    p_option __P((u_long option));

char *          p_secstodate __P((u_long));

int             dn_count_labels __P((const char *));

int             dn_comp __P((const char *, u_char *, int,

                             u_char **, u_char **));

int             dn_expand __P((const u_char *, const u_char *, const u_char *,

                               char *, int));

u_int           res_randomid __P((void));

int             res_nameinquery __P((const char *, int, int,

                                     const u_char *, const u_char *));

int             res_queriesmatch __P((const u_char *, const u_char *,

                                      const u_char *, const u_char *));

const char *    p_section __P((int section, int opcode));

/* Things involving a resolver context. */

int             res_ninit __P((res_state));

int             res_nisourserver __P((const res_state,

                                      const struct sockaddr_in *));

void            fp_resstat __P((const res_state, FILE *));

void            res_npquery __P((const res_state, const u_char *, int, FILE *));

const char *    res_hostalias __P((const res_state, const char *,

                                   char *, size_t));

int             res_nquery __P((res_state,

                                const char *, int, int, u_char *, int));

int             res_nsearch __P((res_state, const char *, int,

                                 int, u_char *, int));

int             res_nquerydomain __P((res_state,

                                      const char *, const char *, int, int,

                                      u_char *, int));

int             res_nmkquery __P((res_state,

                                  int, const char *, int, int, const u_char *,

                                  int, const u_char *, u_char *, int));

int             res_nsend __P((res_state, const u_char *, int, u_char *, int));

void            res_nclose __P((res_state));

__END_DECLS

#endif /* !_RESOLV_H_ */