300 lines
9 KiB
C
300 lines
9 KiB
C
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/*++
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Copyright (c) Microsoft Corporation. All rights reserved.
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Module Name:
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nameser.h
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Abstract:
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Definitions for the DNS resolver and nameserver.
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Author:
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Mike Massa (mikemas) Jan 31, 1992
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Revision History:
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Who When What
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-------- -------- ----------------------------------------------
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mikemas 01-31-92 created
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Notes:
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--*/
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/******************************************************************
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*
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* SpiderTCP BIND
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*
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* Copyright 1990 Spider Systems Limited
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*
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* NAMESER.H
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*
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******************************************************************/
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/*
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* /usr/projects/tcp/SCCS.rel3/rel/src/include/arpa/0/s.nameser.h
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* @(#)nameser.h 5.3
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*
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* Last delta created 14:06:04 3/4/91
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* This file extracted 11:19:28 3/8/91
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*
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* Modifications:
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*
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* GSS 20 Jul 90 New File
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*/
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/*
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* Copyright (c) 1983, 1989 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that: (1) source distributions retain this entire copyright
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* notice and comment, and (2) distributions including binaries display
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* the following acknowledgement: ``This product includes software
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* developed by the University of California, Berkeley and its contributors''
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* in the documentation or other materials provided with the distribution
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* and in all advertising materials mentioning features or use of this
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* software. Neither the name of the University nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)nameser.h 5.24 (Berkeley) 6/1/90
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*/
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#ifndef _NAMESER_INCLUDED
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#define _NAMESER_INCLUDED
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/*
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* Define constants based on rfc883
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*/
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#define PACKETSZ 512 /* maximum packet size */
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#define MAXDNAME 256 /* maximum domain name */
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#define MAXCDNAME 255 /* maximum compressed domain name */
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#define MAXLABEL 63 /* maximum length of domain label */
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/* Number of bytes of fixed size data in query structure */
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#define QFIXEDSZ 4
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/* number of bytes of fixed size data in resource record */
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#define RRFIXEDSZ 10
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/*
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* Internet nameserver port number
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*/
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#define NAMESERVER_PORT 53
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/*
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* Currently defined opcodes
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*/
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#define QUERY 0x0 /* standard query */
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#define IQUERY 0x1 /* inverse query */
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#define STATUS 0x2 /* nameserver status query */
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/*#define xxx 0x3 /* 0x3 reserved */
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/* non standard */
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#define UPDATEA 0x9 /* add resource record */
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#define UPDATED 0xa /* delete a specific resource record */
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#define UPDATEDA 0xb /* delete all nemed resource record */
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#define UPDATEM 0xc /* modify a specific resource record */
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#define UPDATEMA 0xd /* modify all named resource record */
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#define ZONEINIT 0xe /* initial zone transfer */
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#define ZONEREF 0xf /* incremental zone referesh */
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/*
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* Currently defined response codes
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*/
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#ifndef NOERROR
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#define NOERROR 0 /* no error */
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#endif
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#define FORMERR 1 /* format error */
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#define SERVFAIL 2 /* server failure */
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#define NXDOMAIN 3 /* non existent domain */
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#define NOTIMP 4 /* not implemented */
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#define REFUSED 5 /* query refused */
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/* non standard */
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#define NOCHANGE 0xf /* update failed to change db */
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/*
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* Type values for resources and queries
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*/
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#define T_A 1 /* host address */
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#define T_NS 2 /* authoritative server */
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#define T_MD 3 /* mail destination */
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#define T_MF 4 /* mail forwarder */
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#define T_CNAME 5 /* connonical name */
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#define T_SOA 6 /* start of authority zone */
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#define T_MB 7 /* mailbox domain name */
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#define T_MG 8 /* mail group member */
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#define T_MR 9 /* mail rename name */
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#define T_NULL 10 /* null resource record */
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#define T_WKS 11 /* well known service */
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#define T_PTR 12 /* domain name pointer */
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#define T_HINFO 13 /* host information */
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#define T_MINFO 14 /* mailbox information */
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#define T_MX 15 /* mail routing information */
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#define T_TXT 16 /* text strings */
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#define T_AFSDB 18 /* AFS database servers */
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#define T_ATMA 34 /* ATM endpoint address */
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/* non standard */
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#define T_UINFO 100 /* user (finger) information */
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#define T_UID 101 /* user ID */
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#define T_GID 102 /* group ID */
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#define T_UNSPEC 103 /* Unspecified format (binary data) */
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/* Query type values which do not appear in resource records */
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#define T_AXFR 252 /* transfer zone of authority */
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#define T_MAILB 253 /* transfer mailbox records */
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#define T_MAILA 254 /* transfer mail agent records */
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#define T_ANY 255 /* wildcard match */
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/*
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* Values for class field
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*/
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#define C_IN 1 /* the arpa internet */
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#define C_CHAOS 3 /* for chaos net at MIT */
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#define C_HS 4 /* for Hesiod name server at MIT */
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/* Query class values which do not appear in resource records */
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#define C_ANY 255 /* wildcard match */
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/*
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* Status return codes for T_UNSPEC conversion routines
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*/
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#define CONV_SUCCESS 0
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#define CONV_OVERFLOW -1
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#define CONV_BADFMT -2
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#define CONV_BADCKSUM -3
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#define CONV_BADBUFLEN -4
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#ifndef BYTE_ORDER
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#define LITTLE_ENDIAN 1234 /* least-significant byte first (vax) */
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#define BIG_ENDIAN 4321 /* most-significant byte first (IBM, net) */
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#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long (pdp) */
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#if defined(vax) || defined(ns32000) || defined(sun386) || defined(MIPSEL) || \
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defined(BIT_ZERO_ON_RIGHT)
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#define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#if defined(sel) || defined(pyr) || defined(mc68000) || defined(sparc) || \
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defined(is68k) || defined(tahoe) || defined(ibm032) || defined(ibm370) || \
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defined(MIPSEB) || defined (BIT_ZERO_ON_LEFT)
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#define BYTE_ORDER BIG_ENDIAN
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#endif
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#ifndef BYTE_ORDER /* still not defined */
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#if defined(u3b2) || defined(m68k)
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#define BYTE_ORDER BIG_ENDIAN
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#endif
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#if defined(i286) || defined(i386) || defined(_AMD64_) || defined(_IA64_)
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#define BYTE_ORDER LITTLE_ENDIAN
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#endif
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#endif /* ~BYTE_ORDER */
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#endif /* BYTE_ORDER */
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#ifndef BYTE_ORDER
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/* you must determine what the correct bit order is for your compiler */
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UNDEFINED_BIT_ORDER;
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#endif
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/*
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* Structure for query header, the order of the fields is machine and
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* compiler dependent, in our case, the bits within a byte are assignd
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* least significant first, while the order of transmition is most
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* significant first. This requires a somewhat confusing rearrangement.
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*/
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typedef struct {
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unsigned short id; /* query identification number */
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#if BYTE_ORDER == BIG_ENDIAN
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/* fields in third byte */
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unsigned char qr:1; /* response flag */
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unsigned char opcode:4; /* purpose of message */
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unsigned char aa:1; /* authoritive answer */
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unsigned char tc:1; /* truncated message */
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unsigned char rd:1; /* recursion desired */
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/* fields in fourth byte */
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unsigned char ra:1; /* recursion available */
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unsigned char pr:1; /* primary server required (non standard) */
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unsigned char unused:2; /* unused bits */
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unsigned char rcode:4; /* response code */
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#endif
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#if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN
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/* fields in third byte */
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unsigned char rd:1; /* recursion desired */
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unsigned char tc:1; /* truncated message */
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unsigned char aa:1; /* authoritive answer */
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unsigned char opcode:4; /* purpose of message */
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unsigned char qr:1; /* response flag */
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/* fields in fourth byte */
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unsigned char rcode:4; /* response code */
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unsigned char unused:2; /* unused bits */
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unsigned char pr:1; /* primary server required (non standard) */
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unsigned char ra:1; /* recursion available */
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#endif
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/* remaining bytes */
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unsigned short qdcount; /* number of question entries */
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unsigned short ancount; /* number of answer entries */
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unsigned short nscount; /* number of authority entries */
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unsigned short arcount; /* number of resource entries */
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} HEADER;
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/*
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* Defines for handling compressed domain names
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*/
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#define INDIR_MASK 0xc0
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/*
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* Structure for passing resource records around.
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*/
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struct rrec {
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short r_zone; /* zone number */
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short r_class; /* class number */
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short r_type; /* type number */
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unsigned long r_ttl; /* time to live */
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int r_size; /* size of data area */
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char *r_data; /* pointer to data */
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};
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extern unsigned short _getshort();
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extern unsigned long _getlong();
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/*
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* Inline versions of get/put short/long.
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* Pointer is advanced; we assume that both arguments
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* are lvalues and will already be in registers.
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* cp MUST be unsigned char *.
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*/
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#define GETSHORT(s, cp) { \
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(s) = *(cp)++ << 8; \
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(s) |= *(cp)++; \
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}
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#define GETLONG(l, cp) { \
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(l) = *(cp)++ << 8; \
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(l) |= *(cp)++; (l) <<= 8; \
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(l) |= *(cp)++; (l) <<= 8; \
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(l) |= *(cp)++; \
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}
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#define PUTSHORT(s, cp) { \
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*(cp)++ = (s) >> 8; \
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*(cp)++ = (s); \
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}
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/*
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* Warning: PUTLONG destroys its first argument.
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*/
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#define PUTLONG(l, cp) { \
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(cp)[3] = l; \
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(cp)[2] = (l >>= 8); \
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(cp)[1] = (l >>= 8); \
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(cp)[0] = l >> 8; \
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(cp) += sizeof(unsigned long); \
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}
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#endif // _NAMESER_INCLUDED
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