nameser.h revision 8858
1/* 2 * Copyright (c) 1983, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * - 34 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 35 * 36 * Permission to use, copy, modify, and distribute this software for any 37 * purpose with or without fee is hereby granted, provided that the above 38 * copyright notice and this permission notice appear in all copies, and that 39 * the name of Digital Equipment Corporation not be used in advertising or 40 * publicity pertaining to distribution of the document or software without 41 * specific, written prior permission. 42 * 43 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 44 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 45 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 46 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 47 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 48 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 49 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 50 * SOFTWARE. 51 * - 52 * --Copyright-- 53 * 54 * @(#)nameser.h 8.2 (Berkeley) 2/16/94 55 * From Id: nameser.h,v 4.9.1.15 1994/07/19 22:51:24 vixie Exp 56 */ 57 58#ifndef _NAMESER_H_ 59#define _NAMESER_H_ 60 61#include <sys/param.h> 62#include <sys/types.h> 63#include <sys/cdefs.h> 64#include <machine/endian.h> 65 66 67/* 68 * revision information. this is the release date in YYYYMMDD format. 69 * it can change every day so the right thing to do with it is use it 70 * in preprocessor commands such as "#if (__BIND > 19931104)". do not 71 * compare for equality; rather, use it to determine whether your resolver 72 * is new enough to contain a certain feature. 73 */ 74 75#define __BIND 19940417 /* interface version stamp */ 76 77/* 78 * Define constants based on rfc883 79 */ 80#define PACKETSZ 512 /* maximum packet size */ 81#define MAXDNAME 256 /* maximum domain name */ 82#define MAXCDNAME 255 /* maximum compressed domain name */ 83#define MAXLABEL 63 /* maximum length of domain label */ 84#define HFIXEDSZ 12 /* #/bytes of fixed data in header */ 85#define QFIXEDSZ 4 /* #/bytes of fixed data in query */ 86#define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */ 87#define INT32SZ 4 /* for systems without 32-bit ints */ 88#define INT16SZ 2 /* for systems without 16-bit ints */ 89#define INADDRSZ 4 /* for sizeof(struct inaddr) != 4 */ 90 91/* 92 * Internet nameserver port number 93 */ 94#define NAMESERVER_PORT 53 95 96/* 97 * Currently define d opcodes 98 */ 99#define QUERY 0x0 /* standard query */ 100#define IQUERY 0x1 /* inverse query */ 101#define STATUS 0x2 /* nameserver status query */ 102 /* 0x3 reserved */ 103 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 104#define UPDATEA 0x9 /* add resource record */ 105#define UPDATED 0xa /* delete a specific resource record */ 106#define UPDATEDA 0xb /* delete all named resource record */ 107#define UPDATEM 0xc /* modify a specific resource record */ 108#define UPDATEMA 0xd /* modify all named resource record */ 109 110#define ZONEINIT 0xe /* initial zone transfer */ 111#define ZONEREF 0xf /* incremental zone referesh */ 112 113/* 114 * Currently define d response codes 115 */ 116#define NOERROR 0 /* no error */ 117#define FORMERR 1 /* format error */ 118#define SERVFAIL 2 /* server failure */ 119#define NXDOMAIN 3 /* non existent domain */ 120#define NOTIMP 4 /* not implemented */ 121#define REFUSED 5 /* query refused */ 122 /* non standard */ 123#define NOCHANGE 0xf /* update failed to change db */ 124 125/* 126 * Type values for resources and queries 127 */ 128#define T_A 1 /* host address */ 129#define T_NS 2 /* authoritative server */ 130#define T_MD 3 /* mail destination */ 131#define T_MF 4 /* mail forwarder */ 132#define T_CNAME 5 /* connonical name */ 133#define T_SOA 6 /* start of authority zone */ 134#define T_MB 7 /* mailbox domain name */ 135#define T_MG 8 /* mail group member */ 136#define T_MR 9 /* mail rename name */ 137#define T_NULL 10 /* null resource record */ 138#define T_WKS 11 /* well known service */ 139#define T_PTR 12 /* domain name pointer */ 140#define T_HINFO 13 /* host information */ 141#define T_MINFO 14 /* mailbox information */ 142#define T_MX 15 /* mail routing information */ 143#define T_TXT 16 /* text strings */ 144#define T_RP 17 /* responsible person */ 145#define T_AFSDB 18 /* AFS cell database */ 146#define T_X25 19 /* X_25 calling address */ 147#define T_ISDN 20 /* ISDN calling address */ 148#define T_RT 21 /* router */ 149#define T_NSAP 22 /* NSAP address */ 150#define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */ 151 /* non standard */ 152#define T_UINFO 100 /* user (finger) information */ 153#define T_UID 101 /* user ID */ 154#define T_GID 102 /* group ID */ 155#define T_UNSPEC 103 /* Unspecified format (binary data) */ 156#define T_SA 200 /* shuffle address */ 157 /* Query type values which do not appear in resource records */ 158#define T_AXFR 252 /* transfer zone of authority */ 159#define T_MAILB 253 /* transfer mailbox records */ 160#define T_MAILA 254 /* transfer mail agent records */ 161#define T_ANY 255 /* wildcard match */ 162 163/* 164 * Values for class field 165 */ 166 167#define C_IN 1 /* the arpa internet */ 168#define C_CHAOS 3 /* for chaos net (MIT) */ 169#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 170 /* Query class values which do not appear in resource records */ 171#define C_ANY 255 /* wildcard match */ 172 173/* 174 * Status return codes for T_UNSPEC conversion routines 175 */ 176#define CONV_SUCCESS 0 177#define CONV_OVERFLOW (-1) 178#define CONV_BADFMT (-2) 179#define CONV_BADCKSUM (-3) 180#define CONV_BADBUFLEN (-4) 181 182/* 183 * Structure for query header. The order of the fields is machine- and 184 * compiler-dependent, depending on the byte/bit order and the layout 185 * of bit fields. We use bit fields only in int variables, as this 186 * is all ANSI requires. This requires a somewhat confusing rearrangement. 187 */ 188 189typedef struct { 190 unsigned id :16; /* query identification number */ 191#if BYTE_ORDER == BIG_ENDIAN 192 /* fields in third byte */ 193 unsigned qr: 1; /* response flag */ 194 unsigned opcode: 4; /* purpose of message */ 195 unsigned aa: 1; /* authoritive answer */ 196 unsigned tc: 1; /* truncated message */ 197 unsigned rd: 1; /* recursion desired */ 198 /* fields in fourth byte */ 199 unsigned ra: 1; /* recursion available */ 200 unsigned pr: 1; /* primary server req'd (!standard) */ 201 unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */ 202 unsigned rcode :4; /* response code */ 203#endif 204#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN 205 /* fields in third byte */ 206 unsigned rd :1; /* recursion desired */ 207 unsigned tc :1; /* truncated message */ 208 unsigned aa :1; /* authoritive answer */ 209 unsigned opcode :4; /* purpose of message */ 210 unsigned qr :1; /* response flag */ 211 /* fields in fourth byte */ 212 unsigned rcode :4; /* response code */ 213 unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */ 214 unsigned pr :1; /* primary server req'd (!standard) */ 215 unsigned ra :1; /* recursion available */ 216#endif 217 /* remaining bytes */ 218 unsigned qdcount :16; /* number of question entries */ 219 unsigned ancount :16; /* number of answer entries */ 220 unsigned nscount :16; /* number of authority entries */ 221 unsigned arcount :16; /* number of resource entries */ 222} HEADER; 223 224/* 225 * Defines for handling compressed domain names 226 */ 227#define INDIR_MASK 0xc0 228 229/* 230 * Structure for passing resource records around. 231 */ 232struct rrec { 233 int16_t r_zone; /* zone number */ 234 int16_t r_class; /* class number */ 235 int16_t r_type; /* type number */ 236 u_int32_t r_ttl; /* time to live */ 237 int r_size; /* size of data area */ 238 char *r_data; /* pointer to data */ 239}; 240 241extern u_int16_t _getshort __P((const u_char *)); 242extern u_int32_t _getlong __P((const u_char *)); 243 244/* 245 * Inline versions of get/put short/long. Pointer is advanced. 246 * 247 * These macros demonstrate the property of C whereby it can be 248 * portable or it can be elegant but rarely both. 249 */ 250#define GETSHORT(s, cp) { \ 251 register u_char *t_cp = (u_char *)(cp); \ 252 (s) = ((u_int16_t)t_cp[0] << 8) \ 253 | ((u_int16_t)t_cp[1]) \ 254 ; \ 255 (cp) += INT16SZ; \ 256} 257 258#define GETLONG(l, cp) { \ 259 register u_char *t_cp = (u_char *)(cp); \ 260 (l) = ((u_int32_t)t_cp[0] << 24) \ 261 | ((u_int32_t)t_cp[1] << 16) \ 262 | ((u_int32_t)t_cp[2] << 8) \ 263 | ((u_int32_t)t_cp[3]) \ 264 ; \ 265 (cp) += INT32SZ; \ 266} 267 268#define PUTSHORT(s, cp) { \ 269 register u_int16_t t_s = (u_int16_t)(s); \ 270 register u_char *t_cp = (u_char *)(cp); \ 271 *t_cp++ = t_s >> 8; \ 272 *t_cp = t_s; \ 273 (cp) += INT16SZ; \ 274} 275 276#define PUTLONG(l, cp) { \ 277 register u_int32_t t_l = (u_int32_t)(l); \ 278 register u_char *t_cp = (u_char *)(cp); \ 279 *t_cp++ = t_l >> 24; \ 280 *t_cp++ = t_l >> 16; \ 281 *t_cp++ = t_l >> 8; \ 282 *t_cp = t_l; \ 283 (cp) += INT32SZ; \ 284} 285 286#endif /* !_NAMESER_H_ */ 287