1/* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.14.4.1 2006/04/07 08:48:09 guy Exp $ (LBL) */ 2/* 3 * Copyright (c) 1983, 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nameser.h 8.2 (Berkeley) 2/16/94 35 * - 36 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 37 * 38 * Permission to use, copy, modify, and distribute this software for any 39 * purpose with or without fee is hereby granted, provided that the above 40 * copyright notice and this permission notice appear in all copies, and that 41 * the name of Digital Equipment Corporation not be used in advertising or 42 * publicity pertaining to distribution of the document or software without 43 * specific, written prior permission. 44 * 45 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 46 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 47 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 48 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 49 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 50 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 51 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 52 * SOFTWARE. 53 * - 54 * --Copyright-- 55 */ 56 57#ifndef _NAMESER_H_ 58#define _NAMESER_H_ 59 60#include <sys/types.h> 61 62/* 63 * Define constants based on rfc883 64 */ 65#define PACKETSZ 512 /* maximum packet size */ 66#define MAXDNAME 256 /* maximum domain name */ 67#define MAXCDNAME 255 /* maximum compressed domain name */ 68#define MAXLABEL 63 /* maximum length of domain label */ 69 /* Number of bytes of fixed size data in query structure */ 70#define QFIXEDSZ 4 71 /* number of bytes of fixed size data in resource record */ 72#define RRFIXEDSZ 10 73 74/* 75 * Internet nameserver port number 76 */ 77#define NAMESERVER_PORT 53 78#define MULTICASTDNS_PORT 5353 79 80/* 81 * Currently defined opcodes 82 */ 83#define QUERY 0x0 /* standard query */ 84#define IQUERY 0x1 /* inverse query */ 85#define STATUS 0x2 /* nameserver status query */ 86#if 0 87#define xxx 0x3 /* 0x3 reserved */ 88#endif 89 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 90#define UPDATEA 0x9 /* add resource record */ 91#define UPDATED 0xa /* delete a specific resource record */ 92#define UPDATEDA 0xb /* delete all named resource record */ 93#define UPDATEM 0xc /* modify a specific resource record */ 94#define UPDATEMA 0xd /* modify all named resource record */ 95 96#define ZONEINIT 0xe /* initial zone transfer */ 97#define ZONEREF 0xf /* incremental zone referesh */ 98 99/* 100 * Undefine various #defines from various System V-flavored OSes (Solaris, 101 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 102 */ 103#ifdef T_NULL 104#undef T_NULL 105#endif 106#ifdef T_OPT 107#undef T_OPT 108#endif 109#ifdef T_UNSPEC 110#undef T_UNSPEC 111#endif 112#ifdef NOERROR 113#undef NOERROR 114#endif 115 116/* 117 * Currently defined response codes 118 */ 119#define NOERROR 0 /* no error */ 120#define FORMERR 1 /* format error */ 121#define SERVFAIL 2 /* server failure */ 122#define NXDOMAIN 3 /* non existent domain */ 123#define NOTIMP 4 /* not implemented */ 124#define REFUSED 5 /* query refused */ 125 /* non standard */ 126#define NOCHANGE 0xf /* update failed to change db */ 127 128/* 129 * Type values for resources and queries 130 */ 131#define T_A 1 /* host address */ 132#define T_NS 2 /* authoritative server */ 133#define T_MD 3 /* mail destination */ 134#define T_MF 4 /* mail forwarder */ 135#define T_CNAME 5 /* connonical name */ 136#define T_SOA 6 /* start of authority zone */ 137#define T_MB 7 /* mailbox domain name */ 138#define T_MG 8 /* mail group member */ 139#define T_MR 9 /* mail rename name */ 140#define T_NULL 10 /* null resource record */ 141#define T_WKS 11 /* well known service */ 142#define T_PTR 12 /* domain name pointer */ 143#define T_HINFO 13 /* host information */ 144#define T_MINFO 14 /* mailbox information */ 145#define T_MX 15 /* mail routing information */ 146#define T_TXT 16 /* text strings */ 147#define T_RP 17 /* responsible person */ 148#define T_AFSDB 18 /* AFS cell database */ 149#define T_X25 19 /* X_25 calling address */ 150#define T_ISDN 20 /* ISDN calling address */ 151#define T_RT 21 /* router */ 152#define T_NSAP 22 /* NSAP address */ 153#define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 154#define T_SIG 24 /* security signature */ 155#define T_KEY 25 /* security key */ 156#define T_PX 26 /* X.400 mail mapping */ 157#define T_GPOS 27 /* geographical position (withdrawn) */ 158#define T_AAAA 28 /* IP6 Address */ 159#define T_LOC 29 /* Location Information */ 160#define T_NXT 30 /* Next Valid Name in Zone */ 161#define T_EID 31 /* Endpoint identifier */ 162#define T_NIMLOC 32 /* Nimrod locator */ 163#define T_SRV 33 /* Server selection */ 164#define T_ATMA 34 /* ATM Address */ 165#define T_NAPTR 35 /* Naming Authority PoinTeR */ 166#define T_KX 36 /* Key Exchanger */ 167#define T_CERT 37 /* Certificates in the DNS */ 168#define T_A6 38 /* IP6 address */ 169#define T_DNAME 39 /* non-terminal redirection */ 170#define T_SINK 40 /* unknown */ 171#define T_OPT 41 /* EDNS0 option (meta-RR) */ 172#define T_APL 42 /* lists of address prefixes */ 173#define T_DS 43 /* Delegation Signer */ 174#define T_SSHFP 44 /* SSH Fingerprint */ 175#define T_IPSECKEY 45 /* IPsec keying material */ 176#define T_RRSIG 46 /* new security signature */ 177#define T_NSEC 47 /* provable insecure information */ 178#define T_DNSKEY 48 /* new security key */ 179 /* non standard */ 180#define T_SPF 99 /* sender policy framework */ 181#define T_UINFO 100 /* user (finger) information */ 182#define T_UID 101 /* user ID */ 183#define T_GID 102 /* group ID */ 184#define T_UNSPEC 103 /* Unspecified format (binary data) */ 185#define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 186 /* Query type values which do not appear in resource records */ 187#define T_TKEY 249 /* Transaction Key [RFC2930] */ 188#define T_TSIG 250 /* Transaction Signature [RFC2845] */ 189#define T_IXFR 251 /* incremental transfer [RFC1995] */ 190#define T_AXFR 252 /* transfer zone of authority */ 191#define T_MAILB 253 /* transfer mailbox records */ 192#define T_MAILA 254 /* transfer mail agent records */ 193#define T_ANY 255 /* wildcard match */ 194 195/* 196 * Values for class field 197 */ 198 199#define C_IN 1 /* the arpa internet */ 200#define C_CHAOS 3 /* for chaos net (MIT) */ 201#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 202 /* Query class values which do not appear in resource records */ 203#define C_ANY 255 /* wildcard match */ 204#define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag */ 205 206/* 207 * Status return codes for T_UNSPEC conversion routines 208 */ 209#define CONV_SUCCESS 0 210#define CONV_OVERFLOW -1 211#define CONV_BADFMT -2 212#define CONV_BADCKSUM -3 213#define CONV_BADBUFLEN -4 214 215/* 216 * Structure for query header. 217 */ 218typedef struct { 219 u_int16_t id; /* query identification number */ 220 u_int8_t flags1; /* first byte of flags */ 221 u_int8_t flags2; /* second byte of flags */ 222 u_int16_t qdcount; /* number of question entries */ 223 u_int16_t ancount; /* number of answer entries */ 224 u_int16_t nscount; /* number of authority entries */ 225 u_int16_t arcount; /* number of resource entries */ 226} HEADER; 227 228/* 229 * Macros for subfields of flag fields. 230 */ 231#define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 232#define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 233#define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 234#define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 235#define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 236 237#define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 238#define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 239#define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 240#define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 241 242/* 243 * Defines for handling compressed domain names, EDNS0 labels, etc. 244 */ 245#define INDIR_MASK 0xc0 /* 11.... */ 246#define EDNS0_MASK 0x40 /* 01.... */ 247# define EDNS0_ELT_BITLABEL 0x01 248 249/* 250 * Structure for passing resource records around. 251 */ 252struct rrec { 253 int16_t r_zone; /* zone number */ 254 int16_t r_class; /* class number */ 255 int16_t r_type; /* type number */ 256 u_int32_t r_ttl; /* time to live */ 257 int r_size; /* size of data area */ 258 char *r_data; /* pointer to data */ 259}; 260 261/* 262 * Inline versions of get/put short/long. Pointer is advanced. 263 * We also assume that a "u_int16_t" holds 2 "chars" 264 * and that a "u_int32_t" holds 4 "chars". 265 * 266 * These macros demonstrate the property of C whereby it can be 267 * portable or it can be elegant but never both. 268 */ 269#define GETSHORT(s, cp) { \ 270 register u_char *t_cp = (u_char *)(cp); \ 271 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ 272 (cp) += 2; \ 273} 274 275#define GETLONG(l, cp) { \ 276 register u_char *t_cp = (u_char *)(cp); \ 277 (l) = (((u_int32_t)t_cp[0]) << 24) \ 278 | (((u_int32_t)t_cp[1]) << 16) \ 279 | (((u_int32_t)t_cp[2]) << 8) \ 280 | (((u_int32_t)t_cp[3])); \ 281 (cp) += 4; \ 282} 283 284#define PUTSHORT(s, cp) { \ 285 register u_int16_t t_s = (u_int16_t)(s); \ 286 register u_char *t_cp = (u_char *)(cp); \ 287 *t_cp++ = t_s >> 8; \ 288 *t_cp = t_s; \ 289 (cp) += 2; \ 290} 291 292/* 293 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 294 * were depending on this "feature", you will lose. 295 */ 296#define PUTLONG(l, cp) { \ 297 register u_int32_t t_l = (u_int32_t)(l); \ 298 register u_char *t_cp = (u_char *)(cp); \ 299 *t_cp++ = t_l >> 24; \ 300 *t_cp++ = t_l >> 16; \ 301 *t_cp++ = t_l >> 8; \ 302 *t_cp = t_l; \ 303 (cp) += 4; \ 304} 305 306#endif /* !_NAMESER_H_ */ 307