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NAMESER.H

/*
 * ++Copyright++ 1983, 1989, 1993
 * -
 * 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   8.1 (Berkeley) 6/2/93
 *    nameser.h,v 1.2 1995/05/06 14:23:54 hjl Exp
 */

#ifndef _NAMESER_H_
#define     _NAMESER_H_

#ifndef WIN32
#include <sys/param.h>
#if (!defined(BSD)) || (BSD < 199306)
# include <sys/bitypes.h>
#else
# include <sys/types.h>
#endif
#include <sys/cdefs.h>
#else 
# include <sys/types.h>
#include <winsock.h>
#define __LITTLE_ENDIAN 1
#define __BYTE_ORDER __LITTLE_ENDIAN
typedef short int16_t;
typedef unsigned short u_int16_t;
typedef long u_int32_t;
#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            19940417    /* interface version stamp */

/*
 * Define constants based on rfc883
 */
#define PACKETSZ  512         /* maximum packet size */
#define MAXDNAME  256         /* 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           /* for sizeof(struct inaddr) != 4 */

/*
 * 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 xxx           0x3         *//* 0x3 reserved */
#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
 */
#define NOERROR         0           /* no error */
#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 */
      /* 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_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 */

/*
 * 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)

#ifndef __BYTE_ORDER
#if (BSD >= 199103)
# include <machine/endian.h>
#else
#ifdef linux
# include <endian.h>
#else
#define     __LITTLE_ENDIAN   1234  /* least-significant byte first (vax, pc) */
#define     __BIG_ENDIAN      4321  /* most-significant byte first (IBM, net) */
#define     __PDP_ENDIAN      3412  /* LSB first in word, MSW first in long (pdp)*/

#if defined(vax) || defined(ns32000) || defined(sun386) || defined(i386) || \
    defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \
    defined(__alpha__) || defined(__alpha)
#define __BYTE_ORDER    __LITTLE_ENDIAN
#endif

#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
    defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
    defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\
    defined(apollo) || defined(__convex__) || defined(_CRAY) || \
    defined(__hppa) || defined(__hp9000) || \
    defined(__hp9000s300) || defined(__hp9000s700) || \
    defined (BIT_ZERO_ON_LEFT) || defined(m68k)
#define __BYTE_ORDER    __BIG_ENDIAN
#endif
#endif /* linux */
#endif /* BSD */
#endif /* __BYTE_ORDER */

#if !defined(__BYTE_ORDER) || \
    (__BYTE_ORDER != __BIG_ENDIAN && __BYTE_ORDER != __LITTLE_ENDIAN && \
    __BYTE_ORDER != __PDP_ENDIAN)
      /* you must determine what the correct bit order is for
       * your compiler - the next line is an intentional error
       * which will force your compiles to bomb until you fix
       * the above macros.
       */
  error "Undefined or invalid __BYTE_ORDER";
#endif

/*
 * 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 */
#if __BYTE_ORDER == __BIG_ENDIAN
                  /* fields in third byte */
      unsigned    qr: 1;            /* response flag */
      unsigned    opcode: 4;  /* purpose of message */
      unsigned    aa: 1;            /* authoritive answer */
      unsigned    tc: 1;            /* truncated message */
      unsigned    rd: 1;            /* recursion desired */
                  /* fields in fourth byte */
      unsigned    ra: 1;            /* recursion available */
      unsigned    pr: 1;            /* primary server req'd (!standard) */
      unsigned    unused :2;  /* unused bits (MBZ as of 4.9.3a3) */
      unsigned    rcode :4;   /* response code */
#endif
#if __BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __PDP_ENDIAN
                  /* fields in third byte */
      unsigned    rd :1;            /* recursion desired */
      unsigned    tc :1;            /* truncated message */
      unsigned    aa :1;            /* authoritive answer */
      unsigned    opcode :4;  /* purpose of message */
      unsigned    qr :1;            /* response flag */
                  /* fields in fourth byte */
      unsigned    rcode :4;   /* response code */
      unsigned    unused :2;  /* unused bits (MBZ as of 4.9.3a3) */
      unsigned    pr :1;            /* primary server req'd (!standard) */
      unsigned    ra :1;            /* recursion available */
#endif
                  /* 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 {
      int16_t           r_zone;                 /* zone number */
      int16_t           r_class;          /* class number */
      int16_t           r_type;                 /* type number */
      u_int32_t   r_ttl;                  /* time to live */
      int         r_size;                 /* size of data area */
      char        *r_data;          /* pointer to data */
};

//extern    u_int16_t   _getshort __P((const u_char *));
//extern    u_int32_t   _getlong __P((const u_char *));

/*
 * 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) { \
      register u_char *t_cp = (u_char *)(cp); \
      (s) = ((u_int16_t)t_cp[0] << 8) \
          | ((u_int16_t)t_cp[1]) \
          ; \
      (cp) += INT16SZ; \
}

#define GETLONG(l, cp) { \
      register u_char *t_cp = (u_char *)(cp); \
      (l) = ((u_int32_t)t_cp[0] << 24) \
          | ((u_int32_t)t_cp[1] << 16) \
          | ((u_int32_t)t_cp[2] << 8) \
          | ((u_int32_t)t_cp[3]) \
          ; \
      (cp) += INT32SZ; \
}

#define PUTSHORT(s, cp) { \
      register u_int16_t t_s = (u_int16_t)(s); \
      register u_char *t_cp = (u_char *)(cp); \
      *t_cp++ = t_s >> 8; \
      *t_cp   = t_s; \
      (cp) += INT16SZ; \
}

#define PUTLONG(l, cp) { \
      register u_int32_t t_l = (u_int32_t)(l); \
      register u_char *t_cp = (u_char *)(cp); \
      *t_cp++ = t_l >> 24; \
      *t_cp++ = t_l >> 16; \
      *t_cp++ = t_l >> 8; \
      *t_cp   = t_l; \
      (cp) += INT32SZ; \
}

#endif /* !_NAMESER_H_ */

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