1 /* nameser.h 4.3 85/03/27 */ 2 /* 3 * Define constants based on rfc883 4 */ 5 #define PACKETSZ 512 /* maximum packet size */ 6 #define MAXDNAME 256 /* maximum domain name */ 7 #define MAXCDNAME 255 /* maximum compressed domain name */ 8 #define MAXLABEL 63 /* maximum length of domain label */ 9 /* Number of bytes of fixed size data in query structure */ 10 #define QFIXEDSZ 4 11 /* number of bytes of fixed size data in resource record */ 12 #define RRFIXEDSZ 10 13 14 #ifdef vax 15 #define HTONS(s) (((s >> 8) & 0xff) | ((s & 0xff) << 8)) 16 #else 17 #define HTONS(s) 18 #endif 19 20 /* 21 * Internet nameserver port number 22 */ 23 #define NAMESERVER_PORT 53 24 25 /* 26 * Currently defined opcodes 27 */ 28 #define QUERY 0 /* standard query */ 29 #define IQUERY 1 /* inverse query */ 30 #define CQUERYM 2 /* completion query (multiple) */ 31 #define CQUERYU 3 /* completion query (unique) */ 32 /* non standard */ 33 #define UPDATEA 11 /* add resource record */ 34 #define UPDATED 12 /* delete resource record */ 35 #define UPDATEM 13 /* modify resource record */ 36 #define ZONEINIT 14 /* initial zone transfer */ 37 #define ZONEREF 15 /* incremental zone referesh */ 38 39 /* 40 * Currently defined response codes 41 */ 42 #define NOERROR 0 /* no error */ 43 #define FORMERR 1 /* format error */ 44 #define SERVFAIL 2 /* server failure */ 45 #define NXDOMAIN 3 /* non existent domain */ 46 #define NOTIMP 4 /* not implemented */ 47 #define REFUSED 5 /* query refused */ 48 /* non standard */ 49 #define NOCHANGE 15 /* update failed to change db */ 50 51 /* 52 * Type values for resources and queries 53 */ 54 #define T_A 1 /* host address */ 55 #define T_NS 2 /* authoritative server */ 56 #define T_MD 3 /* mail destination */ 57 #define T_MF 4 /* mail forwarder */ 58 #define T_CNAME 5 /* connonical name */ 59 #define T_SOA 6 /* start of authority zone */ 60 #define T_MB 7 /* mailbox domain name */ 61 #define T_MG 8 /* mail group member */ 62 #define T_MR 9 /* mail rename name */ 63 #define T_NULL 10 /* null resource record */ 64 #define T_WKS 11 /* well known service */ 65 #define T_PTR 12 /* domain name pointer */ 66 #define T_HINFO 13 /* host information */ 67 #define T_MINFO 14 /* mailbox information */ 68 /* non standard */ 69 #define T_UINFO 15 /* user (finger) information */ 70 #define T_UID 16 /* user ID */ 71 #define T_GID 17 /* group ID */ 72 /* Query type values which do not appear in resource records */ 73 #define T_AXFR 252 /* transfer zone of authority */ 74 #define T_MAILB 253 /* transfer mailbox records */ 75 #define T_MAILA 254 /* transfer mail agent records */ 76 #define T_ANY 255 /* wildcard match */ 77 78 /* 79 * Values for class field 80 */ 81 82 #define C_IN 1 /* the arpa internet */ 83 #define C_CS 2 /* the computer science network */ 84 /* Query class values which do not appear in resource records */ 85 #define C_ANY 255 /* wildcard match */ 86 87 /* 88 * Structure for query header, the order of the fields is machine and 89 * compiler dependent, in our case, the bits within a byte are assignd 90 * least significant first, while the order of transmition is most 91 * significant first. This requires a somewhat confusing rearrangement. 92 */ 93 94 typedef struct { 95 u_short id; /* query identification number */ 96 /* fields in third byte */ 97 u_char rd:1; /* recursion desired */ 98 u_char tc:1; /* truncated message */ 99 u_char aa:1; /* authoritive answer */ 100 u_char opcode:4; /* purpose of message */ 101 u_char qr:1; /* response flag */ 102 /* fields in forth byte */ 103 u_char rcode:4; /* response code */ 104 u_char unused:2; /* unused bits */ 105 u_char pr:1; /* primary server required (non standard) */ 106 u_char ra:1; /* recursion available */ 107 /* remaining bytes */ 108 u_short qdcount; /* number of question entries */ 109 u_short ancount; /* number of answer entries */ 110 u_short nscount; /* number of authority entries */ 111 u_short arcount; /* number of resource entries */ 112 } HEADER; 113 114 /* 115 * Defines for handling compressed domain names 116 */ 117 #define INDIR_MASK 0xc0 118 119 /* 120 * Structure for passing resource records around. 121 */ 122 struct rrec { 123 short r_zone; /* zone number */ 124 short r_class; /* class number */ 125 short r_type; /* type number */ 126 u_long r_ttl; /* time to live */ 127 int r_size; /* size of data area */ 128 char *r_data; /* pointer to data */ 129 }; 130 131 extern u_short getshort(); 132 extern u_long getlong(); 133