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+/* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.14.4.2 2006/11/10 03:15:35 guy Exp $ (LBL) */
+/*
+ * 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	8.2 (Berkeley) 2/16/94
+ * -
+ * 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
+
+/*
+ * Port for multicast DNS; see
+ *
+ *	http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt
+ *
+ * for the current mDNS spec.
+ */
+#define MULTICASTDNS_PORT	5353
+
+/*
+ * Currently defined opcodes
+ */
+#define QUERY		0x0		/* standard query */
+#define IQUERY		0x1		/* inverse query */
+#define STATUS		0x2		/* nameserver status query */
+#if 0
+#define xxx		0x3		/* 0x3 reserved */
+#endif
+	/* 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 */
+
+/*
+ * Undefine various #defines from various System V-flavored OSes (Solaris,
+ * SINIX, HP-UX) so the compiler doesn't whine that we redefine them.
+ */
+#ifdef T_NULL
+#undef T_NULL
+#endif
+#ifdef T_OPT
+#undef T_OPT
+#endif
+#ifdef T_UNSPEC
+#undef T_UNSPEC
+#endif
+#ifdef NOERROR
+#undef NOERROR
+#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 */
+	/* 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 */
+#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_KX		36		/* Key Exchanger */
+#define T_CERT		37		/* Certificates in the DNS */
+#define T_A6		38		/* IP6 address */
+#define T_DNAME		39		/* non-terminal redirection */
+#define T_SINK		40		/* unknown */
+#define T_OPT		41		/* EDNS0 option (meta-RR) */
+#define T_APL		42		/* lists of address prefixes */
+#define T_DS		43		/* Delegation Signer */
+#define T_SSHFP		44		/* SSH Fingerprint */
+#define T_IPSECKEY	45		/* IPsec keying material */
+#define T_RRSIG		46		/* new security signature */
+#define T_NSEC		47		/* provable insecure information */
+#define T_DNSKEY	48		/* new security key */
+	/* non standard */
+#define T_SPF		99		/* sender policy framework */
+#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_UNSPECA	104		/* "unspecified ascii". Ugly MIT hack */
+	/* Query type values which do not appear in resource records */
+#define T_TKEY		249		/* Transaction Key [RFC2930] */
+#define T_TSIG		250		/* Transaction Signature [RFC2845] */
+#define T_IXFR		251		/* incremental transfer [RFC1995] */
+#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 */
+#define C_QU		0x8000		/* mDNS QU flag in queries */
+#define C_CACHE_FLUSH	0x8000		/* mDNS cache flush flag in replies */
+
+/*
+ * 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
+
+/*
+ * Structure for query header.
+ */
+typedef struct {
+	u_int16_t id;		/* query identification number */
+	u_int8_t  flags1;	/* first byte of flags */
+	u_int8_t  flags2;	/* second byte of flags */
+	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;
+
+/*
+ * Macros for subfields of flag fields.
+ */
+#define DNS_QR(np)	((np)->flags1 & 0x80)		/* response flag */
+#define DNS_OPCODE(np)	((((np)->flags1) >> 3) & 0xF)	/* purpose of message */
+#define DNS_AA(np)	((np)->flags1 & 0x04)		/* authoritative answer */
+#define DNS_TC(np)	((np)->flags1 & 0x02)		/* truncated message */
+#define DNS_RD(np)	((np)->flags1 & 0x01)		/* recursion desired */
+
+#define DNS_RA(np)	((np)->flags2 & 0x80)	/* recursion available */
+#define DNS_AD(np)	((np)->flags2 & 0x20)	/* authentic data from named */
+#define DNS_CD(np)	((np)->flags2 & 0x10)	/* checking disabled by resolver */
+#define DNS_RCODE(np)	((np)->flags2 & 0xF)	/* response code */
+
+/*
+ * Defines for handling compressed domain names, EDNS0 labels, etc.
+ */
+#define INDIR_MASK	0xc0	/* 11.... */
+#define EDNS0_MASK	0x40	/* 01.... */
+#  define EDNS0_ELT_BITLABEL 0x01
+
+/*
+ * 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 */
+};
+
+/*
+ * 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_ */