238 lines
9.1 KiB
C
238 lines
9.1 KiB
C
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/*
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* ++Copyright++ 1983, 1989, 1993
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* -
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* Copyright (c) 1983, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* -
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* Portions Copyright (c) 1993 by Digital Equipment Corporation.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies, and that
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* the name of Digital Equipment Corporation not be used in advertising or
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* publicity pertaining to distribution of the document or software without
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* specific, written prior permission.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
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* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
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* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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* -
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* --Copyright--
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*/
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/*
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* @(#)nameser.h 8.1 (Berkeley) 6/2/93
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* $Id: nameser.h,v 8.3 1995/08/21 01:27:12 vixie Exp
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*/
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#ifndef _NAMESER_H_
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#define _NAMESER_H_
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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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#define HFIXEDSZ 12 /* #/bytes of fixed data in header */
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#define QFIXEDSZ 4 /* #/bytes of fixed data in query */
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#define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
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#define INT32SZ 4 /* for systems without 32-bit ints */
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#define INT16SZ 2 /* for systems without 16-bit ints */
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#define INADDRSZ 4 /* for sizeof(struct inaddr) != 4 */
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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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#define NS_NOTIFY_OP 0x4 /* notify secondary of SOA change */
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#ifdef ALLOW_UPDATES
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/* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
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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 named 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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#endif
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/*
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* Currently defined response codes
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*/
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#define NOERROR 0 /* no error */
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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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#ifdef ALLOW_UPDATES
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/* non standard */
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# define NOCHANGE 0xf /* update failed to change db */
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#endif
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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 /* canonical 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_RP 17 /* responsible person */
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#define T_AFSDB 18 /* AFS cell database */
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#define T_X25 19 /* X_25 calling address */
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#define T_ISDN 20 /* ISDN calling address */
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#define T_RT 21 /* router */
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#define T_NSAP 22 /* NSAP address */
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#define T_NSAP_PTR 23 /* reverse NSAP lookup (deprecated) */
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#define T_SIG 24 /* security signature */
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#define T_KEY 25 /* security key */
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#define T_PX 26 /* X.400 mail mapping */
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#define T_GPOS 27 /* geographical position (withdrawn) */
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#define T_AAAA 28 /* IP6 Address */
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#define T_LOC 29 /* Location Information */
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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 (MIT) */
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#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
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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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/*
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* Structure for query header. The order of the fields is machine- and
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* compiler-dependent, depending on the byte/bit order and the layout
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* of bit fields. We use bit fields only in int variables, as this
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* is all ANSI requires. This requires a somewhat confusing rearrangement.
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*/
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typedef struct {
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unsigned id :16; /* 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 qr: 1; /* response flag */
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unsigned opcode: 4; /* purpose of message */
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unsigned aa: 1; /* authoritive answer */
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unsigned tc: 1; /* truncated message */
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unsigned rd: 1; /* recursion desired */
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/* fields in fourth byte */
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unsigned ra: 1; /* recursion available */
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unsigned pr:1; /* primary server required (non standard) */
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unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */
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unsigned 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 rd :1; /* recursion desired */
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unsigned tc :1; /* truncated message */
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unsigned aa :1; /* authoritive answer */
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unsigned opcode :4; /* purpose of message */
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unsigned qr :1; /* response flag */
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/* fields in fourth byte */
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unsigned rcode :4; /* response code */
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unsigned unused :2; /* unused bits (MBZ as of 4.9.3a3) */
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unsigned pr:1; /* primary server required (non standard) */
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unsigned ra :1; /* recursion available */
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#endif
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/* remaining bytes */
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unsigned qdcount :16; /* number of question entries */
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unsigned ancount :16; /* number of answer entries */
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unsigned nscount :16; /* number of authority entries */
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unsigned arcount :16; /* 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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int16_t r_zone; /* zone number */
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int16_t r_class; /* class number */
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int16_t r_type; /* type number */
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u_int32_t 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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#endif /* !_NAMESER_H_ */
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