text: /*!\file arpa/nameser.h
   * Nameserver API.
   */
  
  /*
   * Copyright (c) 1983, 1989, 1993
   *        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.
   *
   * -
   * Portions Copyright (c) 1993 by Digital Equipment Corporation.
   *
   * 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, and that
   * the name of Digital Equipment Corporation not be used in advertising or
   * publicity pertaining to distribution of the document or software without
   * specific, written prior permission.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
   * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
   * CORPORATION 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.
   * -
   * --Copyright--
   *
   *      @(#)nameser.h        8.2 (Berkeley) 2/16/94
   *        From Id: nameser.h,v 4.9.1.15 1994/07/19 22:51:24 vixie Exp
   *        $Id: nameser.h,v 1.8 1996/08/29 20:01:00 peter Exp $
   */
  
  #ifndef __ARPA_NAMESER_H
  #define __ARPA_NAMESER_H
  
  #ifndef __SYS_W32API_H
  #include <sys/w32api.h>
  #endif
  
  #ifndef __SYS_PARAM_H
  #include <sys/param.h>
  #endif
  
  #ifndef __SYS_WTYPES_H
  #include <sys/wtypes.h>
  #endif
  
  #ifndef __SYS_CDEFS_H
  #include <sys/cdefs.h>
  #endif
  
  /*
   * 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 (__BIND > 19931104)".  do not
   * compare for equality; rather, use it to determine whether your resolver
   * is new enough to contain a certain feature.
   */
  
  #define __BIND    19960801  /* interface version stamp */
  
  /*
   * Define constants based on rfc883
   */
  #define PACKETSZ     512               /* maximum packet size */
  #define MAXDNAME    1025               /* maximum domain name */
  #define MAXCDNAME    255               /* maximum compressed domain name */
  #define MAXLABEL      63               /* maximum length of domain label */
  #define HFIXEDSZ      12               /* #/bytes of fixed data in header */
  #define QFIXEDSZ       4               /* #/bytes of fixed data in query */
  #define RRFIXEDSZ     10               /* #/bytes of fixed data in r record */
  #define INT32SZ        4               /* for systems without 32-bit ints */
  #define INT16SZ        2               /* for systems without 16-bit ints */
  #define INADDRSZ       4               /* IPv4 T_A */
  #define IN6ADDRSZ     16               /* IPv6 T_AAAA */
  
  
  /*
   * Internet nameserver port number
   */
  #define NAMESERVER_PORT  53
  
  /*
   * Currently defined opcodes
   */
  #define QUERY          0x0             /* standard query */
  #define IQUERY         0x1             /* inverse query */
  #define STATUS         0x2             /* nameserver status query */
  #define NS_NOTIFY_OP   0x4             /* notify secondary of SOA change */
  
  #ifdef ALLOW_UPDATES
          /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
  # define UPDATEA       0x9             /* add resource record */
  # define UPDATED       0xa             /* delete a specific resource record */
  # define UPDATEDA      0xb             /* delete all named resource record */
  # define UPDATEM       0xc             /* modify a specific resource record */
  # define UPDATEMA      0xd             /* modify all named resource record */
  # define ZONEINIT      0xe             /* initial zone transfer */
  # define ZONEREF       0xf             /* incremental zone referesh */
  #endif
  
  /*
   * Currently defined response codes
   */
  #if !defined(WIN32) && !defined(_WIN32)  /* <winerror.h> value is okay */
  #define NOERROR        0               /* no error */
  #endif
  #define FORMERR        1               /* format error */
  #define SERVFAIL       2               /* server failure */
  #define NXDOMAIN       3               /* non existent domain */
  #define NOTIMP         4               /* not implemented */
  #define REFUSED        5               /* query refused */
  
  #ifdef ALLOW_UPDATES
          /* non standard */
  # define NOCHANGE      0xf             /* update failed to change db */
  #endif
  
  /*
   * Type values for resources and queries
   */
  #define T_A            1               /* host address */
  #define T_NS           2               /* authoritative server */
  #define T_MD           3               /* mail destination */
  #define T_MF           4               /* mail forwarder */
  #define T_CNAME        5               /* canonical name */
  #define T_SOA          6               /* start of authority zone */
  #define T_MB           7               /* mailbox domain name */
  #define T_MG           8               /* mail group member */
  #define T_MR           9               /* mail rename name */
  #define T_NULL         10              /* null resource record */
  #define T_WKS          11              /* well known service */
  #define T_PTR          12              /* domain name pointer */
  #define T_HINFO        13              /* host information */
  #define T_MINFO        14              /* mailbox information */
  #define T_MX           15              /* mail routing information */
  #define T_TXT          16              /* text strings */
  #define T_RP           17              /* responsible person */
  #define T_AFSDB        18              /* AFS cell database */
  #define T_X25          19              /* X_25 calling address */
  #define T_ISDN         20              /* ISDN calling address */
  #define T_RT           21              /* router */
  #define T_NSAP         22              /* NSAP address */
  #define T_NSAP_PTR     23              /* reverse NSAP lookup (deprecated) */
  #define T_SIG          24              /* security signature */
  #define T_KEY          25              /* security key */
  #define T_PX           26              /* X.400 mail mapping */
  #define T_GPOS         27              /* geographical position (withdrawn) */
  #define T_AAAA         28              /* IP6 Address */
  #define T_LOC          29              /* Location Information */
  #define T_NXT          30              /* Next Valid Name in Zone */
  #define T_EID          31              /* Endpoint identifier */
  #define T_NIMLOC       32              /* Nimrod locator */
  #define T_SRV          33              /* Server selection */
  #define T_ATMA         34              /* ATM Address */
  #define T_NAPTR        35              /* Naming Authority PoinTeR */
  #define T_OPT          41              /* Extension mechanisms for DNS (EDNS) */
          /* non standard */
  #define T_UINFO       100              /* user (finger) information */
  #define T_UID         101              /* user ID */
  #define T_GID         102              /* group ID */
  #define T_UNSPEC      103              /* Unspecified format (binary data) */
          /* Query type values which do not appear in resource records */
  #define T_IXFR        251              /* incremental zone transfer */
  #define T_AXFR        252              /* transfer zone of authority */
  #define T_MAILB       253              /* transfer mailbox records */
  #define T_MAILA       254              /* transfer mail agent records */
  #define T_ANY         255              /* wildcard match */
  #define T_CAA         257              /* Certification Authority Authorization, RFC-6844 */
  #define T_WINS        0xFF01           /* WINS name lookup */
  #define T_WINSR       0xFF02           /* WINS reverse lookup */
  
  /*
   * Values for class field
   */
  
  #define C_IN          1                /* the arpa internet */
  #define C_CHAOS       3                /* for chaos net (MIT) */
  #define C_HS          4                /* for Hesiod name server (MIT) (XXX) */
          /* Query class values which do not appear in resource records */
  #define C_ANY         255              /* wildcard match */
  
  /*
   * Status return codes for T_UNSPEC conversion routines
   */
  #define CONV_SUCCESS    0
  #define CONV_OVERFLOW   (-1)
  #define CONV_BADFMT     (-2)
  #define CONV_BADCKSUM   (-3)
  #define CONV_BADBUFLEN  (-4)
  
  W32_CLANG_PACK_WARN_OFF()
  
  #include <sys/pack_on.h>
  
  /*
   * Structure for query header.  The order of the fields is machine- and
   * compiler-dependent, depending on the byte/bit order and the layout
   * of bit fields.  We use bit fields only in int variables, as this
   * is all ANSI requires.  This requires a somewhat confusing rearrangement.
   */
  
  typedef struct {
          unsigned  id : 16;          /* query identification number */
  
          /* fields in third byte */
          unsigned  rd : 1;           /* recursion desired */
          unsigned  tc : 1;           /* truncated message */
          unsigned  aa : 1;           /* authoritative answer */
          unsigned  opcode : 4;       /* purpose of message */
          unsigned  qr : 1;           /* response flag */
  
          /* fields in fourth byte */
          unsigned  rcode : 4;        /* response code */
          unsigned  cd : 1;           /* checking disabled by resolver */
          unsigned  ad : 1;           /* authentic data from named */
          unsigned  unused : 1;       /* unused bits (MBZ as of 4.9.3a3) */
          unsigned  ra : 1;           /* recursion available */
  
          /* remaining bytes */
          unsigned  qdcount : 16;     /* number of question entries */
          unsigned  ancount : 16;     /* number of answer entries */
          unsigned  nscount : 16;     /* number of authority entries */
          unsigned  arcount : 16;     /* number of resource entries */
        } HEADER;
  
  
  /*
   * Defines for handling compressed domain names
   */
  #define INDIR_MASK  0xc0
  
  /*
   * Structure for passing resource records around.
   */
  struct rrec {
         u_short  r_zone;            /* zone number */
         u_short  r_class;           /* class number */
         u_short  r_type;            /* type number */
         u_long   r_ttl;             /* time to live */
         int      r_size;            /* size of data area */
         char    *r_data;            /* pointer to data */
       };
  
  #include <sys/pack_off.h>
  
  W32_CLANG_PACK_WARN_DEF()
  
  __BEGIN_DECLS
  
  W32_FUNC u_short W32_CALL _getshort (const u_char *);
  W32_FUNC u_long  W32_CALL _getlong  (const u_char *);
  
  __END_DECLS
  
  /*
   * Inline versions of get/put short/long.  Pointer is advanced.
   *
   * These macros demonstrate the property of C whereby it can be
   * portable or it can be elegant but rarely both.
   */
  #define GETSHORT(s, cp) do { \
          register u_char *t_cp = (u_char *)(cp); \
          (s) = ((u_short)t_cp[0] << 8) \
              | ((u_short)t_cp[1]); \
          (cp) += INT16SZ; \
        } while (0)
  
  #define GETLONG(l, cp) do { \
          register u_char *t_cp = (u_char *)(cp); \
          (l) = ((u_long)t_cp[0] << 24) \
              | ((u_long)t_cp[1] << 16) \
              | ((u_long)t_cp[2] << 8) \
              | ((u_long)t_cp[3]); \
          (cp) += INT32SZ; \
        } while (0)
  
  #define PUTSHORT(s, cp) do { \
          register u_short t_s = (u_short)(s); \
          register u_char *t_cp = (u_char *)(cp); \
          *t_cp++ = (u_char) (t_s >> 8); \
          *t_cp   = (u_char) t_s; \
          (cp) += INT16SZ; \
        } while (0)
  
  #define PUTLONG(l, cp) do { \
          register u_long t_l = (u_long)(l); \
          register u_char *t_cp = (u_char *)(cp); \
          *t_cp++ = (u_char) (t_l >> 24); \
          *t_cp++ = (u_char) (t_l >> 16); \
          *t_cp++ = (u_char) (t_l >> 8); \
          *t_cp   = (u_char) t_l; \
          (cp) += INT32SZ; \
        } while (0)
  
  #endif
  