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 5.12 (Berkeley) 07/07/86 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 CQUERYM 0x2 /* completion query (multiple) */ 32 #define CQUERYU 0x3 /* completion query (unique) */ 33 /* non standard */ 34 #define UPDATEA 0xb /* add resource record */ 35 #define UPDATED 0xc /* delete resource record */ 36 #define UPDATEM 0xd /* modify resource record */ 37 #define ZONEINIT 0xe /* initial zone transfer */ 38 #define ZONEREF 0xf /* incremental zone referesh */ 39 40 /* 41 * Currently defined response codes 42 */ 43 #define NOERROR 0 /* no error */ 44 #define FORMERR 1 /* format error */ 45 #define SERVFAIL 2 /* server failure */ 46 #define NXDOMAIN 3 /* non existent domain */ 47 #define NOTIMP 4 /* not implemented */ 48 #define REFUSED 5 /* query refused */ 49 /* non standard */ 50 #define NOCHANGE 0xf /* update failed to change db */ 51 52 /* 53 * Type values for resources and queries 54 */ 55 #define T_A 1 /* host address */ 56 #define T_NS 2 /* authoritative server */ 57 #define T_MD 3 /* mail destination */ 58 #define T_MF 4 /* mail forwarder */ 59 #define T_CNAME 5 /* connonical name */ 60 #define T_SOA 6 /* start of authority zone */ 61 #define T_MB 7 /* mailbox domain name */ 62 #define T_MG 8 /* mail group member */ 63 #define T_MR 9 /* mail rename name */ 64 #define T_NULL 10 /* null resource record */ 65 #define T_WKS 11 /* well known service */ 66 #define T_PTR 12 /* domain name pointer */ 67 #define T_HINFO 13 /* host information */ 68 #define T_MINFO 14 /* mailbox information */ 69 #define T_MX 15 /* mail routing information */ 70 /* non standard */ 71 #define T_UINFO 100 /* user (finger) information */ 72 #define T_UID 101 /* user ID */ 73 #define T_GID 102 /* group ID */ 74 /* Query type values which do not appear in resource records */ 75 #define T_AXFR 252 /* transfer zone of authority */ 76 #define T_MAILB 253 /* transfer mailbox records */ 77 #define T_MAILA 254 /* transfer mail agent records */ 78 #define T_ANY 255 /* wildcard match */ 79 80 /* 81 * Values for class field 82 */ 83 84 #define C_IN 1 /* the arpa internet */ 85 #define C_CHAOS 3 /* for chaos net at MIT */ 86 /* Query class values which do not appear in resource records */ 87 #define C_ANY 255 /* wildcard match */ 88 89 /* 90 * Structure for query header, the order of the fields is machine and 91 * compiler dependent, in our case, the bits within a byte are assignd 92 * least significant first, while the order of transmition is most 93 * significant first. This requires a somewhat confusing rearrangement. 94 */ 95 96 typedef struct { 97 u_short id; /* query identification number */ 98 #if defined (sun) || defined (sel) || defined (pyr) || defined (is68k) \ 99 || defined (tahoe) || defined (BIT_ZERO_ON_LEFT) 100 /* Bit zero on left: Gould and similar architectures */ 101 /* fields in third byte */ 102 u_char qr:1; /* response flag */ 103 u_char opcode:4; /* purpose of message */ 104 u_char aa:1; /* authoritive answer */ 105 u_char tc:1; /* truncated message */ 106 u_char rd:1; /* recursion desired */ 107 /* fields in fourth byte */ 108 u_char ra:1; /* recursion available */ 109 u_char pr:1; /* primary server required (non standard) */ 110 u_char unused:2; /* unused bits */ 111 u_char rcode:4; /* response code */ 112 #else 113 #if defined (vax) || defined (BIT_ZERO_ON_RIGHT) 114 /* Bit zero on right: VAX */ 115 /* fields in third byte */ 116 u_char rd:1; /* recursion desired */ 117 u_char tc:1; /* truncated message */ 118 u_char aa:1; /* authoritive answer */ 119 u_char opcode:4; /* purpose of message */ 120 u_char qr:1; /* response flag */ 121 /* fields in fourth byte */ 122 u_char rcode:4; /* response code */ 123 u_char unused:2; /* unused bits */ 124 u_char pr:1; /* primary server required (non standard) */ 125 u_char ra:1; /* recursion available */ 126 #else 127 /* you must determine what the correct bit order is for your compiler */ 128 UNDEFINED_BIT_ORDER; 129 #endif 130 #endif 131 /* remaining bytes */ 132 u_short qdcount; /* number of question entries */ 133 u_short ancount; /* number of answer entries */ 134 u_short nscount; /* number of authority entries */ 135 u_short arcount; /* number of resource entries */ 136 } HEADER; 137 138 /* 139 * Defines for handling compressed domain names 140 */ 141 #define INDIR_MASK 0xc0 142 143 /* 144 * Structure for passing resource records around. 145 */ 146 struct rrec { 147 short r_zone; /* zone number */ 148 short r_class; /* class number */ 149 short r_type; /* type number */ 150 u_long r_ttl; /* time to live */ 151 int r_size; /* size of data area */ 152 char *r_data; /* pointer to data */ 153 }; 154 155 extern u_short getshort(); 156 extern u_long getlong(); 157