home *** CD-ROM | disk | FTP | other *** search
- /*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- *
- * @(#)nameser.h 5.17 (Berkeley) 11/17/87
- */
-
- #ifndef _NAMESER_H
- #define _NAMESER_H
-
- #include <cfuncproto.h>
- #include <machparam.h>
-
- /*
- * Define constants based on rfc883
- */
- #define PACKETSZ 512 /* maximum packet size */
- #define MAXDNAME 256 /* maximum domain name */
- #define MAXCDNAME 255 /* maximum compressed domain name */
- #define MAXLABEL 63 /* maximum length of domain label */
- /* Number of bytes of fixed size data in query structure */
- #define QFIXEDSZ 4
- /* number of bytes of fixed size data in resource record */
- #define RRFIXEDSZ 10
-
- /*
- * Internet nameserver port number
- */
- #define NAMESERVER_PORT 53
-
- /*
- * Currently defined opcodes
- */
- #define QUERY 0x0 /* standard query */
- #define IQUERY 0x1 /* inverse query */
- #define STATUS 0x2 /* nameserver status query */
- /*#define xxx 0x3 /* 0x3 reserved */
- /* non standard */
- #define UPDATEA 0x9 /* add resource record */
- #define UPDATED 0xa /* delete a specific resource record */
- #define UPDATEDA 0xb /* delete all nemed resource record */
- #define UPDATEM 0xc /* modify a specific resource record */
- #define UPDATEMA 0xd /* modify all named resource record */
-
- #define ZONEINIT 0xe /* initial zone transfer */
- #define ZONEREF 0xf /* incremental zone referesh */
-
- /*
- * Currently defined response codes
- */
- #define NOERROR 0 /* no error */
- #define FORMERR 1 /* format error */
- #define SERVFAIL 2 /* server failure */
- #define NXDOMAIN 3 /* non existent domain */
- #define NOTIMP 4 /* not implemented */
- #define REFUSED 5 /* query refused */
- /* non standard */
- #define NOCHANGE 0xf /* update failed to change db */
-
- /*
- * Type values for resources and queries
- */
- #define T_A 1 /* host address */
- #define T_NS 2 /* authoritative server */
- #define T_MD 3 /* mail destination */
- #define T_MF 4 /* mail forwarder */
- #define T_CNAME 5 /* connonical name */
- #define T_SOA 6 /* start of authority zone */
- #define T_MB 7 /* mailbox domain name */
- #define T_MG 8 /* mail group member */
- #define T_MR 9 /* mail rename name */
- #define T_NULL 10 /* null resource record */
- #define T_WKS 11 /* well known service */
- #define T_PTR 12 /* domain name pointer */
- #define T_HINFO 13 /* host information */
- #define T_MINFO 14 /* mailbox information */
- #define T_MX 15 /* mail routing information */
- /* non standard */
- #define T_UINFO 100 /* user (finger) information */
- #define T_UID 101 /* user ID */
- #define T_GID 102 /* group ID */
- #define T_UNSPEC 103 /* Unspecified format (binary data) */
- /* Query type values which do not appear in resource records */
- #define T_AXFR 252 /* transfer zone of authority */
- #define T_MAILB 253 /* transfer mailbox records */
- #define T_MAILA 254 /* transfer mail agent records */
- #define T_ANY 255 /* wildcard match */
-
- /*
- * Values for class field
- */
-
- #define C_IN 1 /* the arpa internet */
- #define C_CHAOS 3 /* for chaos net at MIT */
- /* Query class values which do not appear in resource records */
- #define C_ANY 255 /* wildcard match */
-
- /*
- * Status return codes for T_UNSPEC conversion routines
- */
- #define CONV_SUCCESS 0
- #define CONV_OVERFLOW -1
- #define CONV_BADFMT -2
- #define CONV_BADCKSUM -3
- #define CONV_BADBUFLEN -4
-
- /*
- * Structure for query header, the order of the fields is machine and
- * compiler dependent, in our case, the bits within a byte are assignd
- * least significant first, while the order of transmition is most
- * significant first. This requires a somewhat confusing rearrangement.
- */
-
- typedef struct {
- u_short id; /* query identification number */
- #if defined (sun) || defined (sel) || defined (pyr) || defined (is68k) \
- || defined (tahoe) || defined (BIT_ZERO_ON_LEFT) || (BYTE_ORDER == BIG_ENDIAN)
- /* Bit zero on left: Gould and similar architectures */
- /* fields in third byte */
- u_char qr:1; /* response flag */
- u_char opcode:4; /* purpose of message */
- u_char aa:1; /* authoritive answer */
- u_char tc:1; /* truncated message */
- u_char rd:1; /* recursion desired */
- /* fields in fourth byte */
- u_char ra:1; /* recursion available */
- u_char pr:1; /* primary server required (non standard) */
- u_char unused:2; /* unused bits */
- u_char rcode:4; /* response code */
- #else
- #if defined (vax) || defined(ns32000) || defined (BIT_ZERO_ON_RIGHT) \
- || (BYTE_ORDER == LITTLE_ENDIAN)
- /* Bit zero on right: VAX */
- /* fields in third byte */
- u_char rd:1; /* recursion desired */
- u_char tc:1; /* truncated message */
- u_char aa:1; /* authoritive answer */
- u_char opcode:4; /* purpose of message */
- u_char qr:1; /* response flag */
- /* fields in fourth byte */
- u_char rcode:4; /* response code */
- u_char unused:2; /* unused bits */
- u_char pr:1; /* primary server required (non standard) */
- u_char ra:1; /* recursion available */
- #else
- /* you must determine what the correct bit order is for your compiler */
- UNDEFINED_BIT_ORDER;
- #endif
- #endif
- /* remaining bytes */
- u_short qdcount; /* number of question entries */
- u_short ancount; /* number of answer entries */
- u_short nscount; /* number of authority entries */
- u_short arcount; /* number of resource entries */
- } HEADER;
-
- /*
- * Defines for handling compressed domain names
- */
- #define INDIR_MASK 0xc0
-
- /*
- * Structure for passing resource records around.
- */
- struct rrec {
- short r_zone; /* zone number */
- short r_class; /* class number */
- short r_type; /* type number */
- u_long r_ttl; /* time to live */
- int r_size; /* size of data area */
- char *r_data; /* pointer to data */
- };
-
- _EXTERN u_short _getshort _ARGS_((_CONST u_char *msgp));
- _EXTERN u_long _getlong _ARGS_((_CONST u_char *msgp));
- _EXTERN void putshort _ARGS_ ((u_short s, u_char *msgp));
- _EXTERN void putlong _ARGS_ ((u_long s, u_char *msgp));
-
- /*
- * Inline versions of get/put short/long.
- * Pointer is advanced; we assume that both arguments
- * are lvalues and will already be in registers.
- * cp MUST be u_char *.
- */
- #define GETSHORT(s, cp) { \
- (s) = *(cp)++ << 8; \
- (s) |= *(cp)++; \
- }
-
- #define GETLONG(l, cp) { \
- (l) = *(cp)++ << 8; \
- (l) |= *(cp)++; (l) <<= 8; \
- (l) |= *(cp)++; (l) <<= 8; \
- (l) |= *(cp)++; \
- }
-
-
- #define PUTSHORT(s, cp) { \
- *(cp)++ = (s) >> 8; \
- *(cp)++ = (s); \
- }
-
- /*
- * Warning: PUTLONG destroys its first argument.
- */
- #define PUTLONG(l, cp) { \
- (cp)[3] = l; \
- (cp)[2] = (l >>= 8); \
- (cp)[1] = (l >>= 8); \
- (cp)[0] = l >> 8; \
- (cp) += sizeof(u_long); \
- }
-
- #endif /* _NAMESER_H */
-