1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)nameser.h 5.17 (Berkeley) 11/17/87 7 */ 8 9 /* 10 * Define constants based on rfc883 11 */ 12 #define PACKETSZ 512 /* maximum packet size */ 13 #define MAXDNAME 256 /* maximum domain name */ 14 #define MAXCDNAME 255 /* maximum compressed domain name */ 15 #define MAXLABEL 63 /* maximum length of domain label */ 16 /* Number of bytes of fixed size data in query structure */ 17 #define QFIXEDSZ 4 18 /* number of bytes of fixed size data in resource record */ 19 #define RRFIXEDSZ 10 20 21 /* 22 * Internet nameserver port number 23 */ 24 #define NAMESERVER_PORT 53 25 26 /* 27 * Currently defined opcodes 28 */ 29 #define QUERY 0x0 /* standard query */ 30 #define IQUERY 0x1 /* inverse query */ 31 #define STATUS 0x2 /* nameserver status query */ 32 /*#define xxx 0x3 /* 0x3 reserved */ 33 /* non standard */ 34 #define UPDATEA 0x9 /* add resource record */ 35 #define UPDATED 0xa /* delete a specific resource record */ 36 #define UPDATEDA 0xb /* delete all nemed resource record */ 37 #define UPDATEM 0xc /* modify a specific resource record */ 38 #define UPDATEMA 0xd /* modify all named resource record */ 39 40 #define ZONEINIT 0xe /* initial zone transfer */ 41 #define ZONEREF 0xf /* incremental zone referesh */ 42 43 /* 44 * Currently defined response codes 45 */ 46 #define NOERROR 0 /* no error */ 47 #define FORMERR 1 /* format error */ 48 #define SERVFAIL 2 /* server failure */ 49 #define NXDOMAIN 3 /* non existent domain */ 50 #define NOTIMP 4 /* not implemented */ 51 #define REFUSED 5 /* query refused */ 52 /* non standard */ 53 #define NOCHANGE 0xf /* update failed to change db */ 54 55 /* 56 * Type values for resources and queries 57 */ 58 #define T_A 1 /* host address */ 59 #define T_NS 2 /* authoritative server */ 60 #define T_MD 3 /* mail destination */ 61 #define T_MF 4 /* mail forwarder */ 62 #define T_CNAME 5 /* connonical name */ 63 #define T_SOA 6 /* start of authority zone */ 64 #define T_MB 7 /* mailbox domain name */ 65 #define T_MG 8 /* mail group member */ 66 #define T_MR 9 /* mail rename name */ 67 #define T_NULL 10 /* null resource record */ 68 #define T_WKS 11 /* well known service */ 69 #define T_PTR 12 /* domain name pointer */ 70 #define T_HINFO 13 /* host information */ 71 #define T_MINFO 14 /* mailbox information */ 72 #define T_MX 15 /* mail routing information */ 73 /* non standard */ 74 #define T_UINFO 100 /* user (finger) information */ 75 #define T_UID 101 /* user ID */ 76 #define T_GID 102 /* group ID */ 77 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 78 /* Query type values which do not appear in resource records */ 79 #define T_AXFR 252 /* transfer zone of authority */ 80 #define T_MAILB 253 /* transfer mailbox records */ 81 #define T_MAILA 254 /* transfer mail agent records */ 82 #define T_ANY 255 /* wildcard match */ 83 84 /* 85 * Values for class field 86 */ 87 88 #define C_IN 1 /* the arpa internet */ 89 #define C_CHAOS 3 /* for chaos net at MIT */ 90 /* Query class values which do not appear in resource records */ 91 #define C_ANY 255 /* wildcard match */ 92 93 /* 94 * Status return codes for T_UNSPEC conversion routines 95 */ 96 #define CONV_SUCCESS 0 97 #define CONV_OVERFLOW -1 98 #define CONV_BADFMT -2 99 #define CONV_BADCKSUM -3 100 #define CONV_BADBUFLEN -4 101 102 /* 103 * Structure for query header, the order of the fields is machine and 104 * compiler dependent, in our case, the bits within a byte are assignd 105 * least significant first, while the order of transmition is most 106 * significant first. This requires a somewhat confusing rearrangement. 107 */ 108 109 typedef struct { 110 u_short id; /* query identification number */ 111 #if defined (sun) || defined (sel) || defined (pyr) || defined (is68k) \ 112 || defined (tahoe) || defined (BIT_ZERO_ON_LEFT) 113 /* Bit zero on left: Gould and similar architectures */ 114 /* fields in third byte */ 115 u_char qr:1; /* response flag */ 116 u_char opcode:4; /* purpose of message */ 117 u_char aa:1; /* authoritive answer */ 118 u_char tc:1; /* truncated message */ 119 u_char rd:1; /* recursion desired */ 120 /* fields in fourth byte */ 121 u_char ra:1; /* recursion available */ 122 u_char pr:1; /* primary server required (non standard) */ 123 u_char unused:2; /* unused bits */ 124 u_char rcode:4; /* response code */ 125 #else 126 #if defined (vax) || defined(ns32000) || defined (BIT_ZERO_ON_RIGHT) 127 /* Bit zero on right: VAX */ 128 /* fields in third byte */ 129 u_char rd:1; /* recursion desired */ 130 u_char tc:1; /* truncated message */ 131 u_char aa:1; /* authoritive answer */ 132 u_char opcode:4; /* purpose of message */ 133 u_char qr:1; /* response flag */ 134 /* fields in fourth byte */ 135 u_char rcode:4; /* response code */ 136 u_char unused:2; /* unused bits */ 137 u_char pr:1; /* primary server required (non standard) */ 138 u_char ra:1; /* recursion available */ 139 #else 140 /* you must determine what the correct bit order is for your compiler */ 141 UNDEFINED_BIT_ORDER; 142 #endif 143 #endif 144 /* remaining bytes */ 145 u_short qdcount; /* number of question entries */ 146 u_short ancount; /* number of answer entries */ 147 u_short nscount; /* number of authority entries */ 148 u_short arcount; /* number of resource entries */ 149 } HEADER; 150 151 /* 152 * Defines for handling compressed domain names 153 */ 154 #define INDIR_MASK 0xc0 155 156 /* 157 * Structure for passing resource records around. 158 */ 159 struct rrec { 160 short r_zone; /* zone number */ 161 short r_class; /* class number */ 162 short r_type; /* type number */ 163 u_long r_ttl; /* time to live */ 164 int r_size; /* size of data area */ 165 char *r_data; /* pointer to data */ 166 }; 167 168 extern u_short _getshort(); 169 extern u_long _getlong(); 170 171 /* 172 * Inline versions of get/put short/long. 173 * Pointer is advanced; we assume that both arguments 174 * are lvalues and will already be in registers. 175 * cp MUST be u_char *. 176 */ 177 #define GETSHORT(s, cp) { \ 178 (s) = *(cp)++ << 8; \ 179 (s) |= *(cp)++; \ 180 } 181 182 #define GETLONG(l, cp) { \ 183 (l) = *(cp)++ << 8; \ 184 (l) |= *(cp)++; (l) <<= 8; \ 185 (l) |= *(cp)++; (l) <<= 8; \ 186 (l) |= *(cp)++; \ 187 } 188 189 190 #define PUTSHORT(s, cp) { \ 191 *(cp)++ = (s) >> 8; \ 192 *(cp)++ = (s); \ 193 } 194 195 /* 196 * Warning: PUTLONG destroys its first argument. 197 */ 198 #define PUTLONG(l, cp) { \ 199 (cp)[3] = l; \ 200 (cp)[2] = (l >>= 8); \ 201 (cp)[1] = (l >>= 8); \ 202 (cp)[0] = l >> 8; \ 203 (cp) += sizeof(u_long); \ 204 } 205