/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
nameser.h
Abstract:
Definitions for the DNS resolver and nameserver.
Author:
Mike Massa (mikemas) Jan 31, 1992
Revision History:
Who When What
-------- -------- ----------------------------------------------
mikemas 01-31-92 created
Notes:
--*/
/******************************************************************
*
* SpiderTCP BIND
*
* Copyright 1990 Spider Systems Limited
*
* NAMESER.H
*
******************************************************************/
/*
* /usr/projects/tcp/SCCS.rel3/rel/src/include/arpa/0/s.nameser.h
* @(#)nameser.h 5.3
*
* Last delta created 14:06:04 3/4/91
* This file extracted 11:19:28 3/8/91
*
* Modifications:
*
* GSS 20 Jul 90 New File
*/
/*
* Copyright (c) 1983, 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that: (1) source distributions retain this entire copyright
* notice and comment, and (2) distributions including binaries display
* the following acknowledgement: ``This product includes software
* developed by the University of California, Berkeley and its contributors''
* in the documentation or other materials provided with the distribution
* and in all advertising materials mentioning features or use of this
* software. Neither the name of the University nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)nameser.h 5.24 (Berkeley) 6/1/90
*/
#ifndef _NAMESER_INCLUDED
#define _NAMESER_INCLUDED
/*
* 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
*/
#ifndef NOERROR
#define NOERROR 0 /* no error */
#endif
#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 */
#define T_TXT 16 /* text strings */
#define T_AFSDB 18 /* AFS database servers */
/* 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 */
#define C_HS 4 /* for Hesiod name server 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
#ifndef BYTE_ORDER
#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
#if defined(vax) || defined(ns32000) || defined(sun386) || defined(MIPSEL) || \
defined(BIT_ZERO_ON_RIGHT)
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
defined(MIPSEB) || defined(ux10) || defined (BIT_ZERO_ON_LEFT)
#define BYTE_ORDER BIG_ENDIAN
#endif
#ifndef BYTE_ORDER /* still not defined */
#if defined(u3b2) || defined(m68k)
#define BYTE_ORDER BIG_ENDIAN
#endif
#if defined(i286) || defined(i386) || defined(_AMD64_) || defined(IA64)
#define BYTE_ORDER LITTLE_ENDIAN
#endif
#endif /* ~BYTE_ORDER */
#endif /* BYTE_ORDER */
#ifndef BYTE_ORDER
/* you must determine what the correct bit order is for your compiler */
UNDEFINED_BIT_ORDER;
#endif
/*
* 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 {
unsigned short id; /* query identification number */
#if BYTE_ORDER == BIG_ENDIAN
/* fields in third byte */
unsigned char qr:1; /* response flag */
unsigned char opcode:4; /* purpose of message */
unsigned char aa:1; /* authoritive answer */
unsigned char tc:1; /* truncated message */
unsigned char rd:1; /* recursion desired */
/* fields in fourth byte */
unsigned char ra:1; /* recursion available */
unsigned char pr:1; /* primary server required (non standard) */
unsigned char unused:2; /* unused bits */
unsigned char rcode:4; /* response code */
#endif
#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
/* fields in third byte */
unsigned char rd:1; /* recursion desired */
unsigned char tc:1; /* truncated message */
unsigned char aa:1; /* authoritive answer */
unsigned char opcode:4; /* purpose of message */
unsigned char qr:1; /* response flag */
/* fields in fourth byte */
unsigned char rcode:4; /* response code */
unsigned char unused:2; /* unused bits */
unsigned char pr:1; /* primary server required (non standard) */
unsigned char ra:1; /* recursion available */
#endif
/* remaining bytes */
unsigned short qdcount; /* number of question entries */
unsigned short ancount; /* number of answer entries */
unsigned short nscount; /* number of authority entries */
unsigned 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 */
unsigned long r_ttl; /* time to live */
int r_size; /* size of data area */
char *r_data; /* pointer to data */
};
extern unsigned short _getshort(char *);
extern unsigned long _getlong(char *);
/*
* 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 unsigned 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(unsigned long); \
}
#endif // _NAMESER_INCLUDED