/*
 * ++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
 *	$Id: nameser.h,v 4.9.1.7 1993/12/06 00:42:58 vixie Exp $
 */

#ifndef _NAMESER_INCLUDED /* allow multiple inclusions */
#define _NAMESER_INCLUDED

#include <sys/param.h>
#include <model.h>

/*
 * 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 */
	/* Number of bytes of fixed size data in query structure */
#define QFIXEDSZ	4
	/* number of bytes of fixed size data in resource record */
#define RRFIXEDSZ	10
#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 */
	/* non standard - supports ALLOW_UPDATES */
#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 */

/*
 * 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 */
	/* non standard */
#define NOCHANGE	0xf		/* update failed to change db */

/*
 * 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		/* connonical 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 lookup for NSAP */
#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) */
#define T_SA		200		/* shuffle address */
	/* 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) */
	/* 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
#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(apollo) || defined(__convex__) || defined(__hppa) || \
    defined(__hp9000) || defined(__hp9000s300) || defined(__hp9000s700) || \
    defined (BIT_ZERO_ON_LEFT)
#define BYTE_ORDER	BIG_ENDIAN
#endif

#endif /* BSD */
#endif /* BYTE_ORDER */

/*
 * 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 {
	u_int16		id;		/* query identification number */
#if BYTE_ORDER == BIG_ENDIAN
			/* fields in third byte */
	u_int		qr:1;		/* response flag */
	u_int		opcode:4;	/* purpose of message */
	u_int		aa:1;		/* authoritive answer */
	u_int		tc:1;		/* truncated message */
	u_int		rd:1;		/* recursion desired */
			/* fields in fourth byte */
	u_int		ra:1;		/* recursion available */
	u_int		pr:1;		/* primary server req'd (!standard) */
	u_int		unused:2;	/* unused bits */
	u_int		rcode:4;	/* response code */
#endif
#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
			/* fields in third byte */
	u_int		rd:1;		/* recursion desired */
	u_int		tc:1;		/* truncated message */
	u_int		aa:1;		/* authoritive answer */
	u_int		opcode:4;	/* purpose of message */
	u_int		qr:1;		/* response flag */
			/* fields in fourth byte */
	u_int		rcode:4;	/* response code */
	u_int		unused:2;	/* unused bits */
	u_int		pr:1;		/* primary server req'd (!standard) */
	u_int		ra:1;		/* recursion available */
#endif
			/* remaining bytes */
	u_int16		qdcount;	/* number of question entries */
	u_int16		ancount;	/* number of answer entries */
	u_int16		nscount;	/* number of authority entries */
	u_int16		arcount;	/* number of resource entries */
} HEADER;

/*
 * Defines for handling compressed domain names
 */
#define INDIR_MASK	0xc0

/*
 * Structure for passing resource records around.
 */
struct rrec {
	int16		r_zone;			/* zone number */
	int16		r_class;		/* class number */
	int16		r_type;			/* type number */
	u_int32		r_ttl;			/* time to live */
	int		r_size;			/* size of data area */
	char		*r_data;		/* pointer to data */
};

extern	u_int16		_getshort();
extern	u_int32		_getlong();

/*
 * 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_cp[0] << 8) \
	    | ((u_int16)t_cp[1]) \
	    ; \
	(cp) += 2; \
}

#define GETLONG(l, cp) { \
	register u_char *t_cp = (u_char *)(cp); \
	(l) = ((u_int32)t_cp[0] << 24) \
	    | ((u_int32)t_cp[1] << 16) \
	    | ((u_int32)t_cp[2] << 8) \
	    | ((u_int32)t_cp[3]) \
	    ; \
	(cp) += 4; \
}

#define PUTSHORT(s, cp) { \
	register u_int16 t_s = (u_int16)(s); \
	register u_char *t_cp = (u_char *)(cp); \
	*t_cp++ = t_s >> 8; \
	*t_cp   = t_s; \
	(cp) += 2; \
}

/*
 * Warning: PUTLONG --no-longer-- destroys its first argument.  if you
 * were depending on this "feature", you will lose.
 */
#define PUTLONG(l, cp) { \
	register u_int32 t_l = (u_int32)(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) += 4; \
}

#endif /* _NAMESER_INCLUDED */
