/* @(#) $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 /* * 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_ */