1 /* 2 * Copyright (c) 1983, 1989 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)nameser.h 5.25 (Berkeley) 04/03/91 8 */ 9 10 #ifndef _NAMESER_H_ 11 #define _NAMESER_H_ 12 13 /* 14 * Define constants based on rfc883 15 */ 16 #define PACKETSZ 512 /* maximum packet size */ 17 #define MAXDNAME 256 /* maximum domain name */ 18 #define MAXCDNAME 255 /* maximum compressed domain name */ 19 #define MAXLABEL 63 /* maximum length of domain label */ 20 /* Number of bytes of fixed size data in query structure */ 21 #define QFIXEDSZ 4 22 /* number of bytes of fixed size data in resource record */ 23 #define RRFIXEDSZ 10 24 25 /* 26 * Internet nameserver port number 27 */ 28 #define NAMESERVER_PORT 53 29 30 /* 31 * Currently defined opcodes 32 */ 33 #define QUERY 0x0 /* standard query */ 34 #define IQUERY 0x1 /* inverse query */ 35 #define STATUS 0x2 /* nameserver status query */ 36 /*#define xxx 0x3 /* 0x3 reserved */ 37 /* non standard */ 38 #define UPDATEA 0x9 /* add resource record */ 39 #define UPDATED 0xa /* delete a specific resource record */ 40 #define UPDATEDA 0xb /* delete all nemed resource record */ 41 #define UPDATEM 0xc /* modify a specific resource record */ 42 #define UPDATEMA 0xd /* modify all named resource record */ 43 44 #define ZONEINIT 0xe /* initial zone transfer */ 45 #define ZONEREF 0xf /* incremental zone referesh */ 46 47 /* 48 * Currently defined response codes 49 */ 50 #define NOERROR 0 /* no error */ 51 #define FORMERR 1 /* format error */ 52 #define SERVFAIL 2 /* server failure */ 53 #define NXDOMAIN 3 /* non existent domain */ 54 #define NOTIMP 4 /* not implemented */ 55 #define REFUSED 5 /* query refused */ 56 /* non standard */ 57 #define NOCHANGE 0xf /* update failed to change db */ 58 59 /* 60 * Type values for resources and queries 61 */ 62 #define T_A 1 /* host address */ 63 #define T_NS 2 /* authoritative server */ 64 #define T_MD 3 /* mail destination */ 65 #define T_MF 4 /* mail forwarder */ 66 #define T_CNAME 5 /* connonical name */ 67 #define T_SOA 6 /* start of authority zone */ 68 #define T_MB 7 /* mailbox domain name */ 69 #define T_MG 8 /* mail group member */ 70 #define T_MR 9 /* mail rename name */ 71 #define T_NULL 10 /* null resource record */ 72 #define T_WKS 11 /* well known service */ 73 #define T_PTR 12 /* domain name pointer */ 74 #define T_HINFO 13 /* host information */ 75 #define T_MINFO 14 /* mailbox information */ 76 #define T_MX 15 /* mail routing information */ 77 #define T_TXT 16 /* text strings */ 78 /* non standard */ 79 #define T_UINFO 100 /* user (finger) information */ 80 #define T_UID 101 /* user ID */ 81 #define T_GID 102 /* group ID */ 82 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 83 /* Query type values which do not appear in resource records */ 84 #define T_AXFR 252 /* transfer zone of authority */ 85 #define T_MAILB 253 /* transfer mailbox records */ 86 #define T_MAILA 254 /* transfer mail agent records */ 87 #define T_ANY 255 /* wildcard match */ 88 89 /* 90 * Values for class field 91 */ 92 93 #define C_IN 1 /* the arpa internet */ 94 #define C_CHAOS 3 /* for chaos net at MIT */ 95 #define C_HS 4 /* for Hesiod name server at MIT */ 96 /* Query class values which do not appear in resource records */ 97 #define C_ANY 255 /* wildcard match */ 98 99 /* 100 * Status return codes for T_UNSPEC conversion routines 101 */ 102 #define CONV_SUCCESS 0 103 #define CONV_OVERFLOW -1 104 #define CONV_BADFMT -2 105 #define CONV_BADCKSUM -3 106 #define CONV_BADBUFLEN -4 107 108 #ifndef BYTE_ORDER 109 #define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */ 110 #define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */ 111 #define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */ 112 113 #if defined(vax) || defined(ns32000) || defined(sun386) || defined(MIPSEL) || \ 114 defined(BIT_ZERO_ON_RIGHT) 115 #define BYTE_ORDER LITTLE_ENDIAN 116 117 #endif 118 #if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \ 119 defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \ 120 defined(MIPSEB) || defined (BIT_ZERO_ON_LEFT) 121 #define BYTE_ORDER BIG_ENDIAN 122 #endif 123 #endif /* BYTE_ORDER */ 124 125 #ifndef BYTE_ORDER 126 /* you must determine what the correct bit order is for your compiler */ 127 UNDEFINED_BIT_ORDER; 128 #endif 129 /* 130 * Structure for query header, the order of the fields is machine and 131 * compiler dependent, in our case, the bits within a byte are assignd 132 * least significant first, while the order of transmition is most 133 * significant first. This requires a somewhat confusing rearrangement. 134 */ 135 136 typedef struct { 137 u_short id; /* query identification number */ 138 #if BYTE_ORDER == BIG_ENDIAN 139 /* fields in third byte */ 140 u_char qr:1; /* response flag */ 141 u_char opcode:4; /* purpose of message */ 142 u_char aa:1; /* authoritive answer */ 143 u_char tc:1; /* truncated message */ 144 u_char rd:1; /* recursion desired */ 145 /* fields in fourth byte */ 146 u_char ra:1; /* recursion available */ 147 u_char pr:1; /* primary server required (non standard) */ 148 u_char unused:2; /* unused bits */ 149 u_char rcode:4; /* response code */ 150 #endif 151 #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN 152 /* fields in third byte */ 153 u_char rd:1; /* recursion desired */ 154 u_char tc:1; /* truncated message */ 155 u_char aa:1; /* authoritive answer */ 156 u_char opcode:4; /* purpose of message */ 157 u_char qr:1; /* response flag */ 158 /* fields in fourth byte */ 159 u_char rcode:4; /* response code */ 160 u_char unused:2; /* unused bits */ 161 u_char pr:1; /* primary server required (non standard) */ 162 u_char ra:1; /* recursion available */ 163 #endif 164 /* remaining bytes */ 165 u_short qdcount; /* number of question entries */ 166 u_short ancount; /* number of answer entries */ 167 u_short nscount; /* number of authority entries */ 168 u_short arcount; /* number of resource entries */ 169 } HEADER; 170 171 /* 172 * Defines for handling compressed domain names 173 */ 174 #define INDIR_MASK 0xc0 175 176 /* 177 * Structure for passing resource records around. 178 */ 179 struct rrec { 180 short r_zone; /* zone number */ 181 short r_class; /* class number */ 182 short r_type; /* type number */ 183 u_long r_ttl; /* time to live */ 184 int r_size; /* size of data area */ 185 char *r_data; /* pointer to data */ 186 }; 187 188 extern u_short _getshort(); 189 extern u_long _getlong(); 190 191 /* 192 * Inline versions of get/put short/long. 193 * Pointer is advanced; we assume that both arguments 194 * are lvalues and will already be in registers. 195 * cp MUST be u_char *. 196 */ 197 #define GETSHORT(s, cp) { \ 198 (s) = *(cp)++ << 8; \ 199 (s) |= *(cp)++; \ 200 } 201 202 #define GETLONG(l, cp) { \ 203 (l) = *(cp)++ << 8; \ 204 (l) |= *(cp)++; (l) <<= 8; \ 205 (l) |= *(cp)++; (l) <<= 8; \ 206 (l) |= *(cp)++; \ 207 } 208 209 210 #define PUTSHORT(s, cp) { \ 211 *(cp)++ = (s) >> 8; \ 212 *(cp)++ = (s); \ 213 } 214 215 /* 216 * Warning: PUTLONG destroys its first argument. 217 */ 218 #define PUTLONG(l, cp) { \ 219 (cp)[3] = l; \ 220 (cp)[2] = (l >>= 8); \ 221 (cp)[1] = (l >>= 8); \ 222 (cp)[0] = l >> 8; \ 223 (cp) += sizeof(u_long); \ 224 } 225 226 #endif /* !_NAMESER_H_ */ 227