nameser.h revision 1.2
1/* 2 * ++Copyright++ 1983, 1989, 1993 3 * - 4 * Copyright (c) 1983, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 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-- 54 */ 55 56/* 57 * @(#)nameser.h 8.1 (Berkeley) 6/2/93 58 * $Id: nameser.h,v 8.3 1995/08/21 01:27:12 vixie Exp 59 */ 60 61#ifndef _NAMESER_H_ 62#define _NAMESER_H_ 63 64#include <sys/param.h> 65#if (!defined(BSD)) || (BSD < 199306) 66# include <sys/bitypes.h> 67#else 68# include <sys/types.h> 69#endif 70#include <sys/cdefs.h> 71 72#ifdef _AUX_SOURCE 73#include <sys/types.h> /* ech for A/UX */ 74#define res_send ucb_res_send /* already def'd in libc */ 75#define _res_close _ucb_res_close /* removing res_send.o from the library */ 76#endif /* gives an undefined symbol... */ 77 78/* 79 * revision information. this is the release date in YYYYMMDD format. 80 * it can change every day so the right thing to do with it is use it 81 * in preprocessor commands such as "#if (__BIND > 19931104)". do not 82 * compare for equality; rather, use it to determine whether your resolver 83 * is new enough to contain a certain feature. 84 */ 85 86#define __BIND 19950621 /* interface version stamp */ 87 88/* 89 * Define constants based on rfc883 90 */ 91#define PACKETSZ 512 /* maximum packet size */ 92#define MAXDNAME 256 /* maximum domain name */ 93#define MAXCDNAME 255 /* maximum compressed domain name */ 94#define MAXLABEL 63 /* maximum length of domain label */ 95#define HFIXEDSZ 12 /* #/bytes of fixed data in header */ 96#define QFIXEDSZ 4 /* #/bytes of fixed data in query */ 97#define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */ 98#define INT32SZ 4 /* for systems without 32-bit ints */ 99#define INT16SZ 2 /* for systems without 16-bit ints */ 100#define INADDRSZ 4 /* for sizeof(struct inaddr) != 4 */ 101 102/* 103 * Internet nameserver port number 104 */ 105#define NAMESERVER_PORT 53 106 107/* 108 * Currently defined opcodes 109 */ 110#define QUERY 0x0 /* standard query */ 111#define IQUERY 0x1 /* inverse query */ 112#define STATUS 0x2 /* nameserver status query */ 113/*#define xxx 0x3*/ /* 0x3 reserved */ 114#define NS_NOTIFY_OP 0x4 /* notify secondary of SOA change */ 115#ifdef ALLOW_UPDATES 116 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 117# define UPDATEA 0x9 /* add resource record */ 118# define UPDATED 0xa /* delete a specific resource record */ 119# define UPDATEDA 0xb /* delete all named resource record */ 120# define UPDATEM 0xc /* modify a specific resource record */ 121# define UPDATEMA 0xd /* modify all named resource record */ 122# define ZONEINIT 0xe /* initial zone transfer */ 123# define ZONEREF 0xf /* incremental zone referesh */ 124#endif 125 126/* 127 * Currently defined response codes 128 */ 129#define NOERROR 0 /* no error */ 130#define FORMERR 1 /* format error */ 131#define SERVFAIL 2 /* server failure */ 132#define NXDOMAIN 3 /* non existent domain */ 133#define NOTIMP 4 /* not implemented */ 134#define REFUSED 5 /* query refused */ 135#ifdef ALLOW_UPDATES 136 /* non standard */ 137# define NOCHANGE 0xf /* update failed to change db */ 138#endif 139 140/* 141 * Type values for resources and queries 142 */ 143#define T_A 1 /* host address */ 144#define T_NS 2 /* authoritative server */ 145#define T_MD 3 /* mail destination */ 146#define T_MF 4 /* mail forwarder */ 147#define T_CNAME 5 /* canonical name */ 148#define T_SOA 6 /* start of authority zone */ 149#define T_MB 7 /* mailbox domain name */ 150#define T_MG 8 /* mail group member */ 151#define T_MR 9 /* mail rename name */ 152#define T_NULL 10 /* null resource record */ 153#define T_WKS 11 /* well known service */ 154#define T_PTR 12 /* domain name pointer */ 155#define T_HINFO 13 /* host information */ 156#define T_MINFO 14 /* mailbox information */ 157#define T_MX 15 /* mail routing information */ 158#define T_TXT 16 /* text strings */ 159#define T_RP 17 /* responsible person */ 160#define T_AFSDB 18 /* AFS cell database */ 161#define T_X25 19 /* X_25 calling address */ 162#define T_ISDN 20 /* ISDN calling address */ 163#define T_RT 21 /* router */ 164#define T_NSAP 22 /* NSAP address */ 165#define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */ 166#define T_SIG 24 /* security signature */ 167#define T_KEY 25 /* security key */ 168#define T_PX 26 /* X.400 mail mapping */ 169#define T_GPOS 27 /* geographical position (withdrawn) */ 170#define T_AAAA 28 /* IP6 Address */ 171#define T_LOC 29 /* Location Information */ 172 /* non standard */ 173#define T_UINFO 100 /* user (finger) information */ 174#define T_UID 101 /* user ID */ 175#define T_GID 102 /* group ID */ 176#define T_UNSPEC 103 /* Unspecified format (binary data) */ 177 /* Query type values which do not appear in resource records */ 178#define T_AXFR 252 /* transfer zone of authority */ 179#define T_MAILB 253 /* transfer mailbox records */ 180#define T_MAILA 254 /* transfer mail agent records */ 181#define T_ANY 255 /* wildcard match */ 182 183/* 184 * Values for class field 185 */ 186 187#define C_IN 1 /* the arpa internet */ 188#define C_CHAOS 3 /* for chaos net (MIT) */ 189#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 190 /* Query class values which do not appear in resource records */ 191#define C_ANY 255 /* wildcard match */ 192 193/* 194 * Status return codes for T_UNSPEC conversion routines 195 */ 196#define CONV_SUCCESS 0 197#define CONV_OVERFLOW (-1) 198#define CONV_BADFMT (-2) 199#define CONV_BADCKSUM (-3) 200#define CONV_BADBUFLEN (-4) 201 202#ifndef BYTE_ORDER 203#if (BSD >= 199103) 204# include <machine/endian.h> 205#else 206#ifdef linux 207# include <endian.h> 208#else 209#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */ 210#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 211#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp)*/ 212 213#if defined(vax) || defined(ns32000) || defined(sun386) || defined(i386) || \ 214 defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \ 215 defined(__alpha__) || defined(__alpha) 216#define BYTE_ORDER LITTLE_ENDIAN 217#endif 218 219#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \ 220 defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \ 221 defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || defined(DGUX) ||\ 222 defined(apollo) || defined(__convex__) || defined(_CRAY) || \ 223 defined(__hppa) || defined(__hp9000) || \ 224 defined(__hp9000s300) || defined(__hp9000s700) || \ 225 defined (BIT_ZERO_ON_LEFT) || defined(m68k) 226#define BYTE_ORDER BIG_ENDIAN 227#endif 228#endif /* linux */ 229#endif /* BSD */ 230#endif /* BYTE_ORDER */ 231 232#if !defined(BYTE_ORDER) || \ 233 (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \ 234 BYTE_ORDER != PDP_ENDIAN) 235 /* you must determine what the correct bit order is for 236 * your compiler - the next line is an intentional error 237 * which will force your compiles to bomb until you fix 238 * the above macros. 239 */ 240 error "Undefined or invalid BYTE_ORDER"; 241#endif 242 243/* 244 * Structure for query header. The order of the fields is machine- and 245 * compiler-dependent, depending on the byte/bit order and the layout 246 * of bit fields. We use bit fields only in int variables, as this 247 * is all ANSI requires. This requires a somewhat confusing rearrangement. 248 */ 249 250typedef struct { 251 unsigned id :16; /* query identification number */ 252#if BYTE_ORDER == BIG_ENDIAN 253 /* fields in third byte */ 254 unsigned qr: 1; /* response flag */ 255 unsigned opcode: 4; /* purpose of message */ 256 unsigned aa: 1; /* authoritive answer */ 257 unsigned tc: 1; /* truncated message */ 258 unsigned rd: 1; /* recursion desired */ 259 /* fields in fourth byte */ 260 unsigned ra: 1; /* recursion available */ 261 unsigned pr:1; /* primary server required (non standard) */ 262 unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */ 263 unsigned rcode :4; /* response code */ 264#endif 265#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN 266 /* fields in third byte */ 267 unsigned rd :1; /* recursion desired */ 268 unsigned tc :1; /* truncated message */ 269 unsigned aa :1; /* authoritive answer */ 270 unsigned opcode :4; /* purpose of message */ 271 unsigned qr :1; /* response flag */ 272 /* fields in fourth byte */ 273 unsigned rcode :4; /* response code */ 274 unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */ 275 unsigned pr:1; /* primary server required (non standard) */ 276 unsigned ra :1; /* recursion available */ 277#endif 278 /* remaining bytes */ 279 unsigned qdcount :16; /* number of question entries */ 280 unsigned ancount :16; /* number of answer entries */ 281 unsigned nscount :16; /* number of authority entries */ 282 unsigned arcount :16; /* number of resource entries */ 283} HEADER; 284 285/* 286 * Defines for handling compressed domain names 287 */ 288#define INDIR_MASK 0xc0 289 290/* 291 * Structure for passing resource records around. 292 */ 293struct rrec { 294 int16_t r_zone; /* zone number */ 295 int16_t r_class; /* class number */ 296 int16_t r_type; /* type number */ 297 u_int32_t r_ttl; /* time to live */ 298 int r_size; /* size of data area */ 299 char *r_data; /* pointer to data */ 300}; 301 302extern u_int16_t _getshort __P((const u_char *)); 303extern u_int32_t _getlong __P((const u_char *)); 304 305/* 306 * Inline versions of get/put short/long. Pointer is advanced. 307 * 308 * These macros demonstrate the property of C whereby it can be 309 * portable or it can be elegant but rarely both. 310 */ 311#define GETSHORT(s, cp) { \ 312 register u_char *t_cp = (u_char *)(cp); \ 313 (s) = ((u_int16_t)t_cp[0] << 8) \ 314 | ((u_int16_t)t_cp[1]) \ 315 ; \ 316 (cp) += INT16SZ; \ 317} 318 319#define GETLONG(l, cp) { \ 320 register u_char *t_cp = (u_char *)(cp); \ 321 (l) = ((u_int32_t)t_cp[0] << 24) \ 322 | ((u_int32_t)t_cp[1] << 16) \ 323 | ((u_int32_t)t_cp[2] << 8) \ 324 | ((u_int32_t)t_cp[3]) \ 325 ; \ 326 (cp) += INT32SZ; \ 327} 328 329#define PUTSHORT(s, cp) { \ 330 register u_int16_t t_s = (u_int16_t)(s); \ 331 register u_char *t_cp = (u_char *)(cp); \ 332 *t_cp++ = t_s >> 8; \ 333 *t_cp = t_s; \ 334 (cp) += INT16SZ; \ 335} 336 337#define PUTLONG(l, cp) { \ 338 register u_int32_t t_l = (u_int32_t)(l); \ 339 register u_char *t_cp = (u_char *)(cp); \ 340 *t_cp++ = t_l >> 24; \ 341 *t_cp++ = t_l >> 16; \ 342 *t_cp++ = t_l >> 8; \ 343 *t_cp = t_l; \ 344 (cp) += INT32SZ; \ 345} 346 347#endif /* !_NAMESER_H_ */ 348