[unix-history] / usr / src / include / arpa / nameser.h

/*
 * 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.
 *
 *      @(#)nameser.h	8.1 (Berkeley) 6/2/93
 * -
 * 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--
 */

#ifndef _NAMESER_H_
#define	_NAMESER_H_

#include <sys/types.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 */
	/* 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 - 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 */

/*
 * 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 */
	/* 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
#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(hp9000) || defined(hp9000s300) || \
    defined (BIT_ZERO_ON_LEFT)
#define BYTE_ORDER	BIG_ENDIAN
#endif
#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 {
	u_int16_t 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 required (non 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 required (non standard) */
	u_int	ra:1;		/* recursion available */
#endif
			/* remaining bytes */
	u_int16_t qdcount;	/* number of question entries */
	u_int16_t ancount;	/* number of answer entries */
	u_int16_t nscount;	/* number of authority entries */
	u_int16_t 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_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();
extern	u_int32_t	_getlong();

/*
 * Inline versions of get/put short/long.  Pointer is advanced.
 * We also assume that a "u_int16_t" holds 2 "chars"
 * and that a "u_int32_t" holds 4 "chars".
 *
 * These macros demonstrate the property of C whereby it can be
 * portable or it can be elegant but never 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) += 2; \
}

#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) += 4; \
}

#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) += 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 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) += 4; \
}

#endif /* !_NAMESER_H_ */
Commit	Line	Data
bb0cfa24	1	/*
56559b70 KB	2	* Copyright (c) 1983, 1989, 1993
56559b70 KB	3	* The Regents of the University of California. All rights reserved.
bb0cfa24	4	*
ad787160 C	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
f4f66d2c	20	*
ad787160 C	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*
	33	* @(#)nameser.h 8.1 (Berkeley) 6/2/93
4473e716 MK	34	* -
	35	* Portions Copyright (c) 1993 by Digital Equipment Corporation.
	36	*
	37	* Permission to use, copy, modify, and distribute this software for any
	38	* purpose with or without fee is hereby granted, provided that the above
	39	* copyright notice and this permission notice appear in all copies, and that
	40	* the name of Digital Equipment Corporation not be used in advertising or
	41	* publicity pertaining to distribution of the document or software without
	42	* specific, written prior permission.
	43	*
	44	* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
	45	* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
	46	* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
	47	* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
	48	* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
	49	* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
	50	* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
	51	* SOFTWARE.
	52	* -
	53	* --Copyright--
bb0cfa24 DF	54	*/
bb0cfa24 DF	55
d2b7358e KB	56	#ifndef _NAMESER_H_
	57	#define _NAMESER_H_
	58
4473e716	59	#include <sys/types.h>
b530ea86	60
af0a941b RC	61	/*
	62	* Define constants based on rfc883
	63	*/
	64	#define PACKETSZ 512 /* maximum packet size */
	65	#define MAXDNAME 256 /* maximum domain name */
	66	#define MAXCDNAME 255 /* maximum compressed domain name */
	67	#define MAXLABEL 63 /* maximum length of domain label */
	68	/* Number of bytes of fixed size data in query structure */
	69	#define QFIXEDSZ 4
	70	/* number of bytes of fixed size data in resource record */
	71	#define RRFIXEDSZ 10
	72
c789adbd RC	73	/*
	74	* Internet nameserver port number
	75	*/
	76	#define NAMESERVER_PORT 53
	77
af0a941b RC	78	/*
	79	* Currently defined opcodes
	80	*/
ee6b5faf KD	81	#define QUERY 0x0 /* standard query */
ee6b5faf KD	82	#define IQUERY 0x1 /* inverse query */
7fce374b	83	#define STATUS 0x2 /* nameserver status query */
4473e716 MK	84	/#define xxx 0x3 / 0x3 reserved */
4473e716 MK	85	/* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
9ea790ce KD	86	#define UPDATEA 0x9 /* add resource record */
9ea790ce KD	87	#define UPDATED 0xa /* delete a specific resource record */
4473e716	88	#define UPDATEDA 0xb /* delete all named resource record */
9ea790ce KD	89	#define UPDATEM 0xc /* modify a specific resource record */
	90	#define UPDATEMA 0xd /* modify all named resource record */
	91
ee6b5faf KD	92	#define ZONEINIT 0xe /* initial zone transfer */
ee6b5faf KD	93	#define ZONEREF 0xf /* incremental zone referesh */
af0a941b RC	94
	95	/*
	96	* Currently defined response codes
	97	*/
	98	#define NOERROR 0 /* no error */
	99	#define FORMERR 1 /* format error */
	100	#define SERVFAIL 2 /* server failure */
	101	#define NXDOMAIN 3 /* non existent domain */
	102	#define NOTIMP 4 /* not implemented */
	103	#define REFUSED 5 /* query refused */
	104	/* non standard */
ee6b5faf	105	#define NOCHANGE 0xf /* update failed to change db */
af0a941b RC	106
	107	/*
	108	* Type values for resources and queries
	109	*/
	110	#define T_A 1 /* host address */
	111	#define T_NS 2 /* authoritative server */
	112	#define T_MD 3 /* mail destination */
	113	#define T_MF 4 /* mail forwarder */
	114	#define T_CNAME 5 /* connonical name */
	115	#define T_SOA 6 /* start of authority zone */
	116	#define T_MB 7 /* mailbox domain name */
	117	#define T_MG 8 /* mail group member */
	118	#define T_MR 9 /* mail rename name */
	119	#define T_NULL 10 /* null resource record */
	120	#define T_WKS 11 /* well known service */
	121	#define T_PTR 12 /* domain name pointer */
	122	#define T_HINFO 13 /* host information */
	123	#define T_MINFO 14 /* mailbox information */
73546a32	124	#define T_MX 15 /* mail routing information */
a0c3cad7	125	#define T_TXT 16 /* text strings */
4473e716	126	#define T_RP 17 /* responsible person */
af0a941b	127	/* non standard */
d18857b8 KD	128	#define T_UINFO 100 /* user (finger) information */
	129	#define T_UID 101 /* user ID */
	130	#define T_GID 102 /* group ID */
9ea790ce	131	#define T_UNSPEC 103 /* Unspecified format (binary data) */
af0a941b RC	132	/* Query type values which do not appear in resource records */
	133	#define T_AXFR 252 /* transfer zone of authority */
	134	#define T_MAILB 253 /* transfer mailbox records */
	135	#define T_MAILA 254 /* transfer mail agent records */
	136	#define T_ANY 255 /* wildcard match */
	137
	138	/*
	139	* Values for class field
	140	*/
	141
	142	#define C_IN 1 /* the arpa internet */
4473e716 MK	143	#define C_CHAOS 3 /* for chaos net (MIT) */
4473e716 MK	144	#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
af0a941b RC	145	/* Query class values which do not appear in resource records */
	146	#define C_ANY 255 /* wildcard match */
	147
9ea790ce KD	148	/*
	149	* Status return codes for T_UNSPEC conversion routines
	150	*/
	151	#define CONV_SUCCESS 0
	152	#define CONV_OVERFLOW -1
	153	#define CONV_BADFMT -2
	154	#define CONV_BADCKSUM -3
	155	#define CONV_BADBUFLEN -4
	156
4473e716 MK	157	#ifndef BYTE_ORDER
	158	#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */
	159	#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
	160	#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp)*/
	161
	162	#if defined(vax) \|\| defined(ns32000) \|\| defined(sun386) \|\| defined(i386) \|\| \
	163	defined(MIPSEL) \|\| defined(_MIPSEL) \|\| defined(BIT_ZERO_ON_RIGHT) \|\| \
	164	defined(__alpha__) \|\| defined(__alpha)
	165	#define BYTE_ORDER LITTLE_ENDIAN
	166	#endif
	167
	168	#if defined(sel) \|\| defined(pyr) \|\| defined(mc68000) \|\| defined(sparc) \|\| \
	169	defined(is68k) \|\| defined(tahoe) \|\| defined(ibm032) \|\| defined(ibm370) \|\| \
	170	defined(MIPSEB) \|\| defined(_MIPSEB) \|\| defined(_IBMR2) \|\| \
	171	defined(apollo) \|\| defined(hp9000) \|\| defined(hp9000s300) \|\| \
	172	defined (BIT_ZERO_ON_LEFT)
	173	#define BYTE_ORDER BIG_ENDIAN
	174	#endif
	175	#endif /* BYTE_ORDER */
	176
	177	#if !defined(BYTE_ORDER) \|\| \
	178	(BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \
	179	BYTE_ORDER != PDP_ENDIAN)
	180	/* you must determine what the correct bit order is for
	181	* your compiler - the next line is an intentional error
	182	* which will force your compiles to bomb until you fix
	183	* the above macros.
	184	*/
	185	#error "Undefined or invalid BYTE_ORDER";
	186	#endif
	187
af0a941b	188	/*
b530ea86 MK	189	* Structure for query header. The order of the fields is machine- and
	190	* compiler-dependent, depending on the byte/bit order and the layout
	191	* of bit fields. We use bit fields only in int variables, as this
	192	* is all ANSI requires. This requires a somewhat confusing rearrangement.
af0a941b RC	193	*/
	194
	195	typedef struct {
4473e716	196	u_int16_t id; /* query identification number */
d12659fb	197	#if BYTE_ORDER == BIG_ENDIAN
77c647f2	198	/* fields in third byte */
4473e716 MK	199	u_int qr:1; /* response flag */
	200	u_int opcode:4; /* purpose of message */
	201	u_int aa:1; /* authoritive answer */
	202	u_int tc:1; /* truncated message */
	203	u_int rd:1; /* recursion desired */
b530ea86	204	/* fields in fourth byte */
4473e716 MK	205	u_int ra:1; /* recursion available */
	206	u_int pr:1; /* primary server required (non standard) */
	207	u_int unused:2; /* unused bits */
	208	u_int rcode:4; /* response code */
b530ea86	209	#endif
4473e716	210	#if BYTE_ORDER == LITTLE_ENDIAN \|\| BYTE_ORDER == PDP_ENDIAN
af0a941b	211	/* fields in third byte */
b530ea86	212	u_int rd:1; /* recursion desired */
4473e716 MK	213	u_int tc:1; /* truncated message */
	214	u_int aa:1; /* authoritive answer */
	215	u_int opcode:4; /* purpose of message */
	216	u_int qr:1; /* response flag */
4608f6ee	217	/* fields in fourth byte */
4473e716 MK	218	u_int rcode:4; /* response code */
	219	u_int unused:2; /* unused bits */
	220	u_int pr:1; /* primary server required (non standard) */
	221	u_int ra:1; /* recursion available */
77c647f2	222	#endif
af0a941b	223	/* remaining bytes */
4473e716 MK	224	u_int16_t qdcount; /* number of question entries */
	225	u_int16_t ancount; /* number of answer entries */
	226	u_int16_t nscount; /* number of authority entries */
	227	u_int16_t arcount; /* number of resource entries */
af0a941b RC	228	} HEADER;
	229
	230	/*
	231	* Defines for handling compressed domain names
	232	*/
	233	#define INDIR_MASK 0xc0
	234
	235	/*
	236	* Structure for passing resource records around.
	237	*/
	238	struct rrec {
4473e716 MK	239	int16_t r_zone; /* zone number */
	240	int16_t r_class; /* class number */
	241	int16_t r_type; /* type number */
	242	u_int32_t r_ttl; /* time to live */
af0a941b RC	243	int r_size; /* size of data area */
	244	char r_data; / pointer to data */
	245	};
fff51773	246
4473e716 MK	247	extern u_int16_t _getshort();
4473e716 MK	248	extern u_int32_t _getlong();
92a1935e MK	249
92a1935e MK	250	/*
4473e716 MK	251	* Inline versions of get/put short/long. Pointer is advanced.
	252	* We also assume that a "u_int16_t" holds 2 "chars"
	253	* and that a "u_int32_t" holds 4 "chars".
	254	*
	255	* These macros demonstrate the property of C whereby it can be
	256	* portable or it can be elegant but never both.
92a1935e MK	257	*/
92a1935e MK	258	#define GETSHORT(s, cp) { \
4473e716 MK	259	register u_char t_cp = (u_char )(cp); \
	260	(s) = ((u_int16_t)t_cp[0] << 8) \| (u_int16_t)t_cp[1]; \
	261	(cp) += 2; \
92a1935e MK	262	}
	263
	264	#define GETLONG(l, cp) { \
4473e716 MK	265	register u_char t_cp = (u_char )(cp); \
	266	(l) = (((u_int32_t)t_cp[0]) << 24) \
	267	\| (((u_int32_t)t_cp[1]) << 16) \
	268	\| (((u_int32_t)t_cp[2]) << 8) \
	269	\| (((u_int32_t)t_cp[3])); \
	270	(cp) += 4; \
92a1935e MK	271	}
92a1935e MK	272
92a1935e	273	#define PUTSHORT(s, cp) { \
4473e716 MK	274	register u_int16_t t_s = (u_int16_t)(s); \
	275	register u_char t_cp = (u_char )(cp); \
	276	*t_cp++ = t_s >> 8; \
	277	*t_cp = t_s; \
	278	(cp) += 2; \
92a1935e MK	279	}
	280
	281	/*
4473e716 MK	282	* Warning: PUTLONG --no-longer-- destroys its first argument. if you
4473e716 MK	283	* were depending on this "feature", you will lose.
92a1935e MK	284	*/
92a1935e MK	285	#define PUTLONG(l, cp) { \
4473e716 MK	286	register u_int32_t t_l = (u_int32_t)(l); \
	287	register u_char t_cp = (u_char )(cp); \
	288	*t_cp++ = t_l >> 24; \
	289	*t_cp++ = t_l >> 16; \
	290	*t_cp++ = t_l >> 8; \
	291	*t_cp = t_l; \
	292	(cp) += 4; \
92a1935e	293	}
d2b7358e KB	294
d2b7358e KB	295	#endif /* !_NAMESER_H_ */