1 /* 2 * Copyright (c) 1983, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)nameser.h 8.2 (Berkeley) 02/16/94 8 * - 9 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 10 * 11 * Permission to use, copy, modify, and distribute this software for any 12 * purpose with or without fee is hereby granted, provided that the above 13 * copyright notice and this permission notice appear in all copies, and that 14 * the name of Digital Equipment Corporation not be used in advertising or 15 * publicity pertaining to distribution of the document or software without 16 * specific, written prior permission. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 19 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 21 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 22 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 23 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 24 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 25 * SOFTWARE. 26 * - 27 * --Copyright-- 28 */ 29 30 #ifndef _NAMESER_H_ 31 #define _NAMESER_H_ 32 33 #include <sys/types.h> 34 35 /* 36 * Define constants based on rfc883 37 */ 38 #define PACKETSZ 512 /* maximum packet size */ 39 #define MAXDNAME 256 /* maximum domain name */ 40 #define MAXCDNAME 255 /* maximum compressed domain name */ 41 #define MAXLABEL 63 /* maximum length of domain label */ 42 /* Number of bytes of fixed size data in query structure */ 43 #define QFIXEDSZ 4 44 /* number of bytes of fixed size data in resource record */ 45 #define RRFIXEDSZ 10 46 47 /* 48 * Internet nameserver port number 49 */ 50 #define NAMESERVER_PORT 53 51 52 /* 53 * Currently defined opcodes 54 */ 55 #define QUERY 0x0 /* standard query */ 56 #define IQUERY 0x1 /* inverse query */ 57 #define STATUS 0x2 /* nameserver status query */ 58 /*#define xxx 0x3 /* 0x3 reserved */ 59 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 60 #define UPDATEA 0x9 /* add resource record */ 61 #define UPDATED 0xa /* delete a specific resource record */ 62 #define UPDATEDA 0xb /* delete all named resource record */ 63 #define UPDATEM 0xc /* modify a specific resource record */ 64 #define UPDATEMA 0xd /* modify all named resource record */ 65 66 #define ZONEINIT 0xe /* initial zone transfer */ 67 #define ZONEREF 0xf /* incremental zone referesh */ 68 69 /* 70 * Currently defined response codes 71 */ 72 #define NOERROR 0 /* no error */ 73 #define FORMERR 1 /* format error */ 74 #define SERVFAIL 2 /* server failure */ 75 #define NXDOMAIN 3 /* non existent domain */ 76 #define NOTIMP 4 /* not implemented */ 77 #define REFUSED 5 /* query refused */ 78 /* non standard */ 79 #define NOCHANGE 0xf /* update failed to change db */ 80 81 /* 82 * Type values for resources and queries 83 */ 84 #define T_A 1 /* host address */ 85 #define T_NS 2 /* authoritative server */ 86 #define T_MD 3 /* mail destination */ 87 #define T_MF 4 /* mail forwarder */ 88 #define T_CNAME 5 /* connonical name */ 89 #define T_SOA 6 /* start of authority zone */ 90 #define T_MB 7 /* mailbox domain name */ 91 #define T_MG 8 /* mail group member */ 92 #define T_MR 9 /* mail rename name */ 93 #define T_NULL 10 /* null resource record */ 94 #define T_WKS 11 /* well known service */ 95 #define T_PTR 12 /* domain name pointer */ 96 #define T_HINFO 13 /* host information */ 97 #define T_MINFO 14 /* mailbox information */ 98 #define T_MX 15 /* mail routing information */ 99 #define T_TXT 16 /* text strings */ 100 #define T_RP 17 /* responsible person */ 101 #define T_AFSDB 18 /* AFS cell database */ 102 #define T_NSAP 22 /* NSAP address */ 103 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 104 /* non standard */ 105 #define T_UINFO 100 /* user (finger) information */ 106 #define T_UID 101 /* user ID */ 107 #define T_GID 102 /* group ID */ 108 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 109 /* Query type values which do not appear in resource records */ 110 #define T_AXFR 252 /* transfer zone of authority */ 111 #define T_MAILB 253 /* transfer mailbox records */ 112 #define T_MAILA 254 /* transfer mail agent records */ 113 #define T_ANY 255 /* wildcard match */ 114 115 /* 116 * Values for class field 117 */ 118 119 #define C_IN 1 /* the arpa internet */ 120 #define C_CHAOS 3 /* for chaos net (MIT) */ 121 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 122 /* Query class values which do not appear in resource records */ 123 #define C_ANY 255 /* wildcard match */ 124 125 /* 126 * Status return codes for T_UNSPEC conversion routines 127 */ 128 #define CONV_SUCCESS 0 129 #define CONV_OVERFLOW -1 130 #define CONV_BADFMT -2 131 #define CONV_BADCKSUM -3 132 #define CONV_BADBUFLEN -4 133 134 #ifndef BYTE_ORDER 135 #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax, pc) */ 136 #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 137 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp)*/ 138 139 #if defined(vax) || defined(ns32000) || defined(sun386) || defined(i386) || \ 140 defined(MIPSEL) || defined(_MIPSEL) || defined(BIT_ZERO_ON_RIGHT) || \ 141 defined(__alpha__) || defined(__alpha) 142 #define BYTE_ORDER LITTLE_ENDIAN 143 #endif 144 145 #if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \ 146 defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \ 147 defined(MIPSEB) || defined(_MIPSEB) || defined(_IBMR2) || \ 148 defined(apollo) || defined(hp9000) || defined(hp9000s300) || \ 149 defined (BIT_ZERO_ON_LEFT) 150 #define BYTE_ORDER BIG_ENDIAN 151 #endif 152 #endif /* BYTE_ORDER */ 153 154 #if !defined(BYTE_ORDER) || \ 155 (BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN && \ 156 BYTE_ORDER != PDP_ENDIAN) 157 /* you must determine what the correct bit order is for 158 * your compiler - the next line is an intentional error 159 * which will force your compiles to bomb until you fix 160 * the above macros. 161 */ 162 #error "Undefined or invalid BYTE_ORDER"; 163 #endif 164 165 /* 166 * Structure for query header. The order of the fields is machine- and 167 * compiler-dependent, depending on the byte/bit order and the layout 168 * of bit fields. We use bit fields only in int variables, as this 169 * is all ANSI requires. This requires a somewhat confusing rearrangement. 170 */ 171 172 typedef struct { 173 u_int16_t id; /* query identification number */ 174 #if BYTE_ORDER == BIG_ENDIAN 175 /* fields in third byte */ 176 u_int qr:1; /* response flag */ 177 u_int opcode:4; /* purpose of message */ 178 u_int aa:1; /* authoritive answer */ 179 u_int tc:1; /* truncated message */ 180 u_int rd:1; /* recursion desired */ 181 /* fields in fourth byte */ 182 u_int ra:1; /* recursion available */ 183 u_int pr:1; /* primary server required (non standard) */ 184 u_int unused:2; /* unused bits */ 185 u_int rcode:4; /* response code */ 186 #endif 187 #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN 188 /* fields in third byte */ 189 u_int rd:1; /* recursion desired */ 190 u_int tc:1; /* truncated message */ 191 u_int aa:1; /* authoritive answer */ 192 u_int opcode:4; /* purpose of message */ 193 u_int qr:1; /* response flag */ 194 /* fields in fourth byte */ 195 u_int rcode:4; /* response code */ 196 u_int unused:2; /* unused bits */ 197 u_int pr:1; /* primary server required (non standard) */ 198 u_int ra:1; /* recursion available */ 199 #endif 200 /* remaining bytes */ 201 u_int16_t qdcount; /* number of question entries */ 202 u_int16_t ancount; /* number of answer entries */ 203 u_int16_t nscount; /* number of authority entries */ 204 u_int16_t arcount; /* number of resource entries */ 205 } HEADER; 206 207 /* 208 * Defines for handling compressed domain names 209 */ 210 #define INDIR_MASK 0xc0 211 212 /* 213 * Structure for passing resource records around. 214 */ 215 struct rrec { 216 int16_t r_zone; /* zone number */ 217 int16_t r_class; /* class number */ 218 int16_t r_type; /* type number */ 219 u_int32_t r_ttl; /* time to live */ 220 int r_size; /* size of data area */ 221 char *r_data; /* pointer to data */ 222 }; 223 224 extern u_int16_t _getshort(); 225 extern u_int32_t _getlong(); 226 227 /* 228 * Inline versions of get/put short/long. Pointer is advanced. 229 * We also assume that a "u_int16_t" holds 2 "chars" 230 * and that a "u_int32_t" holds 4 "chars". 231 * 232 * These macros demonstrate the property of C whereby it can be 233 * portable or it can be elegant but never both. 234 */ 235 #define GETSHORT(s, cp) { \ 236 register u_char *t_cp = (u_char *)(cp); \ 237 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ 238 (cp) += 2; \ 239 } 240 241 #define GETLONG(l, cp) { \ 242 register u_char *t_cp = (u_char *)(cp); \ 243 (l) = (((u_int32_t)t_cp[0]) << 24) \ 244 | (((u_int32_t)t_cp[1]) << 16) \ 245 | (((u_int32_t)t_cp[2]) << 8) \ 246 | (((u_int32_t)t_cp[3])); \ 247 (cp) += 4; \ 248 } 249 250 #define PUTSHORT(s, cp) { \ 251 register u_int16_t t_s = (u_int16_t)(s); \ 252 register u_char *t_cp = (u_char *)(cp); \ 253 *t_cp++ = t_s >> 8; \ 254 *t_cp = t_s; \ 255 (cp) += 2; \ 256 } 257 258 /* 259 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 260 * were depending on this "feature", you will lose. 261 */ 262 #define PUTLONG(l, cp) { \ 263 register u_int32_t t_l = (u_int32_t)(l); \ 264 register u_char *t_cp = (u_char *)(cp); \ 265 *t_cp++ = t_l >> 24; \ 266 *t_cp++ = t_l >> 16; \ 267 *t_cp++ = t_l >> 8; \ 268 *t_cp = t_l; \ 269 (cp) += 4; \ 270 } 271 272 #endif /* !_NAMESER_H_ */ 273