auto import from //depot/cupcake/@135843
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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_ */