/*++

Copyright (c) 1991  Microsoft Corporation

Module Name:

    nameser.h

Abstract:

    Definitions for the DNS resolver and nameserver.

Author:

    Mike Massa (mikemas)           Jan 31, 1992

Revision History:

    Who         When        What
    --------    --------    ----------------------------------------------
    mikemas     01-31-92     created

Notes:

--*/

/******************************************************************
 *
 *  SpiderTCP BIND
 *
 *  Copyright 1990  Spider Systems Limited
 *
 *  NAMESER.H
 *
 ******************************************************************/

/*
 *	 /usr/projects/tcp/SCCS.rel3/rel/src/include/arpa/0/s.nameser.h
 *	@(#)nameser.h	5.3
 *
 *	Last delta created	14:06:04 3/4/91
 *	This file extracted	11:19:28 3/8/91
 *
 *	Modifications:
 *
 *		GSS	20 Jul 90	New File
 */

/*
 * Copyright (c) 1983, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *	@(#)nameser.h	5.24 (Berkeley) 6/1/90
 */

/*
 * 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 */
	/* 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

/*
 * 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 */
	/* non standard */
#define UPDATEA		0x9		/* add resource record */
#define UPDATED		0xa		/* delete a specific resource record */
#define UPDATEDA	0xb		/* delete all nemed 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_AFSDB		18		/* AFS database servers */
	/* 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 at MIT */
#define C_HS		4		/* for Hesiod name server at 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
#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax) */
#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(MIPSEL) || \
    defined(BIT_ZERO_ON_RIGHT)
#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 (BIT_ZERO_ON_LEFT)
#define BYTE_ORDER	BIG_ENDIAN
#endif
#ifndef BYTE_ORDER		/* still not defined */
#if defined(u3b2) || defined(m68k)
#define BYTE_ORDER	BIG_ENDIAN
#endif
#if defined(i286) || defined(i386) || defined(_MIPS_) || defined(_ALPHA_) || defined(_PPC_)
#define BYTE_ORDER	LITTLE_ENDIAN
#endif
#endif /* ~BYTE_ORDER */
#endif /* BYTE_ORDER */

#ifndef BYTE_ORDER
	/* you must determine what the correct bit order is for your compiler */
	UNDEFINED_BIT_ORDER;
#endif
/*
 * Structure for query header, the order of the fields is machine and
 * compiler dependent, in our case, the bits within a byte are assignd
 * least significant first, while the order of transmition is most
 * significant first.  This requires a somewhat confusing rearrangement.
 */

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

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

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

extern	unsigned short	_getshort();
extern	unsigned long	_getlong();

/*
 * Inline versions of get/put short/long.
 * Pointer is advanced; we assume that both arguments
 * are lvalues and will already be in registers.
 * cp MUST be unsigned char *.
 */
#define GETSHORT(s, cp) { \
	(s) = *(cp)++ << 8; \
	(s) |= *(cp)++; \
}

#define GETLONG(l, cp) { \
	(l) = *(cp)++ << 8; \
	(l) |= *(cp)++; (l) <<= 8; \
	(l) |= *(cp)++; (l) <<= 8; \
	(l) |= *(cp)++; \
}


#define PUTSHORT(s, cp) { \
	*(cp)++ = (s) >> 8; \
	*(cp)++ = (s); \
}

/*
 * Warning: PUTLONG destroys its first argument.
 */
#define PUTLONG(l, cp) { \
	(cp)[3] = l; \
	(cp)[2] = (l >>= 8); \
	(cp)[1] = (l >>= 8); \
	(cp)[0] = l >> 8; \
	(cp) += sizeof(unsigned long); \
}
