255 lines
9.1 KiB
C
255 lines
9.1 KiB
C
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/* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.5 2000/12/28 20:30:41 itojun Exp $ (LBL) */
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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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* @(#)nameser.h 8.2 (Berkeley) 2/16/94
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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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#ifndef _NAMESER_H_
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#define _NAMESER_H_
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#include <sys/types.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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/* 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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#if 0
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#define xxx 0x3 /* 0x3 reserved */
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#endif
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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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/*
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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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/* 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_RP 17 /* responsible person */
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#define T_AFSDB 18 /* AFS cell database */
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#define T_NSAP 22 /* NSAP address */
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#define T_NSAP_PTR 23 /* reverse lookup for NSAP */
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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.
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*/
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typedef struct {
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u_int16_t id; /* query identification number */
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u_int8_t flags1; /* first byte of flags */
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u_int8_t flags2; /* second byte of flags */
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u_int16_t qdcount; /* number of question entries */
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u_int16_t ancount; /* number of answer entries */
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u_int16_t nscount; /* number of authority entries */
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u_int16_t arcount; /* number of resource entries */
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} HEADER;
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/*
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* Macros for subfields of flag fields.
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*/
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#define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */
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#define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */
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#define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */
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#define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */
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#define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */
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#define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */
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#define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */
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#define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */
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#define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */
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/*
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* Defines for handling compressed domain names, EDNS0 labels, etc.
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*/
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#define INDIR_MASK 0xc0 /* 11.... */
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#define EDNS0_MASK 0x40 /* 01.... */
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# define EDNS0_ELT_BITLABEL 0x01
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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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/*
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* Inline versions of get/put short/long. Pointer is advanced.
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* We also assume that a "u_int16_t" holds 2 "chars"
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* and that a "u_int32_t" holds 4 "chars".
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*
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* These macros demonstrate the property of C whereby it can be
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* portable or it can be elegant but never both.
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*/
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#define GETSHORT(s, cp) { \
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register u_char *t_cp = (u_char *)(cp); \
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(s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \
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(cp) += 2; \
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}
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#define GETLONG(l, cp) { \
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register u_char *t_cp = (u_char *)(cp); \
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(l) = (((u_int32_t)t_cp[0]) << 24) \
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| (((u_int32_t)t_cp[1]) << 16) \
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| (((u_int32_t)t_cp[2]) << 8) \
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| (((u_int32_t)t_cp[3])); \
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(cp) += 4; \
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}
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#define PUTSHORT(s, cp) { \
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register u_int16_t t_s = (u_int16_t)(s); \
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register u_char *t_cp = (u_char *)(cp); \
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*t_cp++ = t_s >> 8; \
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*t_cp = t_s; \
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(cp) += 2; \
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}
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/*
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* Warning: PUTLONG --no-longer-- destroys its first argument. if you
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* were depending on this "feature", you will lose.
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*/
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#define PUTLONG(l, cp) { \
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register u_int32_t t_l = (u_int32_t)(l); \
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register u_char *t_cp = (u_char *)(cp); \
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*t_cp++ = t_l >> 24; \
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*t_cp++ = t_l >> 16; \
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*t_cp++ = t_l >> 8; \
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*t_cp = t_l; \
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(cp) += 4; \
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}
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#endif /* !_NAMESER_H_ */
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