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resolv.h

/*
 * 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_

/* These headers are needed for types used in the `struct res_state'
   declaration.  */
#include <sys/types.h>
#include <netinet/in.h>

#ifndef __need_res_state
# define _RESOLV_H_

# include <sys/param.h>
# include <sys/cdefs.h>
# include <stdio.h>
# include <arpa/nameser.h>
#endif

#ifndef __res_state_defined
# define __res_state_defined

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);

/*
 * 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         nsmap[MAXNS];
                  int               nssocks[MAXNS];
                  u_int16_t         nscount6;
                  u_int16_t         nsinit;
                  struct sockaddr_in6     *nsaddrs[MAXNS];
            } _ext;
      } _u;
};

typedef struct __res_state *res_state;
# undef __need_res_state
#endif

#ifdef _RESOLV_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

/*
 * 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

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" */
};

/*
 * 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  */

/* Things involving an internal (static) resolver context. */
__BEGIN_DECLS
extern struct __res_state *__res_state(void) __attribute__ ((__const__));
__END_DECLS
#define _res (*__res_state())

#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

#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

#endif /* !_RESOLV_H_ */

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