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nameser.h
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nameser.h
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/*
* Copyright (c) 1983, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nameser.h 8.2 (Berkeley) 2/16/94
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* -
* --Copyright--
*/
#ifndef _NAMESER_H_
#define _NAMESER_H_
#include <sys/types.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
/*
* Currently defined opcodes
*/
#define QUERY 0x0 /* standard query */
#define IQUERY 0x1 /* inverse query */
#define STATUS 0x2 /* nameserver status query */
#if 0
#define xxx 0x3 /* 0x3 reserved */
#endif
/* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
#define UPDATEA 0x9 /* add resource record */
#define UPDATED 0xa /* delete a specific resource record */
#define UPDATEDA 0xb /* delete all named 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 */
/*
* Undefine various #defines from various System V-flavored OSes (Solaris,
* SINIX, HP-UX) so the compiler doesn't whine that we redefine them.
*/
#ifdef T_NULL
#undef T_NULL
#endif
#ifdef T_OPT
#undef T_OPT
#endif
#ifdef T_UNSPEC
#undef T_UNSPEC
#endif
#ifdef NOERROR
#undef NOERROR
#endif
/*
* 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 */
#define T_TXT 16 /* text strings */
#define T_RP 17 /* responsible person */
#define T_AFSDB 18 /* AFS cell database */
#define T_X25 19 /* X_25 calling address */
#define T_ISDN 20 /* ISDN calling address */
#define T_RT 21 /* router */
#define T_NSAP 22 /* NSAP address */
#define T_NSAP_PTR 23 /* reverse lookup for NSAP */
#define T_SIG 24 /* security signature */
#define T_KEY 25 /* security key */
#define T_PX 26 /* X.400 mail mapping */
#define T_GPOS 27 /* geographical position (withdrawn) */
#define T_AAAA 28 /* IP6 Address */
#define T_LOC 29 /* Location Information */
#define T_NXT 30 /* Next Valid Name in Zone */
#define T_EID 31 /* Endpoint identifier */
#define T_NIMLOC 32 /* Nimrod locator */
#define T_SRV 33 /* Server selection */
#define T_ATMA 34 /* ATM Address */
#define T_NAPTR 35 /* Naming Authority PoinTeR */
#define T_KX 36 /* Key Exchanger */
#define T_CERT 37 /* Certificates in the DNS */
#define T_A6 38 /* IP6 address */
#define T_DNAME 39 /* non-terminal redirection */
#define T_SINK 40 /* unknown */
#define T_OPT 41 /* EDNS0 option (meta-RR) */
#define T_APL 42 /* lists of address prefixes */
#define T_DS 43 /* Delegation Signer */
#define T_SSHFP 44 /* SSH Fingerprint */
#define T_IPSECKEY 45 /* IPsec keying material */
#define T_RRSIG 46 /* new security signature */
#define T_NSEC 47 /* provable insecure information */
#define T_DNSKEY 48 /* new security key */
/* non standard */
#define T_SPF 99 /* sender policy framework */
#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) */
#define T_UNSPECA 104 /* "unspecified ASCII". Ugly MIT hack */
/* Query type values which do not appear in resource records */
#define T_TKEY 249 /* Transaction Key [RFC2930] */
#define T_TSIG 250 /* Transaction Signature [RFC2845] */
#define T_IXFR 251 /* incremental transfer [RFC1995] */
#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 */
#define T_URI 256 /* uri records [RFC7553] */
/*
* Values for class field
*/
#define C_IN 1 /* the arpa internet */
#define C_CHAOS 3 /* for chaos net (MIT) */
#define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
/* Query class values which do not appear in resource records */
#define C_ANY 255 /* wildcard match */
#define C_QU 0x8000 /* mDNS QU flag in queries */
#define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */
/*
* Values for EDNS option types
*/
#define E_LLQ 1 /* long lived queries protocol */
#define E_UL 2 /* dynamic dns update leases */
#define E_NSID 3 /* name server identifier */
#define E_DAU 5 /* signal DNSSEC algorithm understood */
#define E_DHU 6 /* signal DS hash understood */
#define E_N3U 7 /* signal NSEC3 hash understood */
#define E_ECS 8 /* EDNS client subnet */
#define E_EXPIRE 9 /* zone expiration */
#define E_COOKIE 10 /* DNS cookies */
#define E_KEEPALIVE 11 /* TCP keepalive */
#define E_PADDING 12 /* pad DNS messages */
#define E_CHAIN 13 /* chain DNS queries */
#define E_KEYTAG 14 /* EDNS key tag */
#define E_CLIENTTAG 16 /* EDNS client tag */
#define E_SERVERTAG 17 /* EDNS server tag */
/*
* Values for DNSSEC Algorithms
* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
*/
#define A_DELETE 0
#define A_RSAMD5 1
#define A_DH 2
#define A_DSA 3
#define A_RSASHA1 5
#define A_DSA_NSEC3_SHA1 6
#define A_RSASHA1_NSEC3_SHA1 7
#define A_RSASHA256 8
#define A_RSASHA512 10
#define A_ECC_GOST 12
#define A_ECDSAP256SHA256 13
#define A_ECDSAP384SHA384 14
#define A_ED25519 15
#define A_ED448 16
#define A_INDIRECT 252
#define A_PRIVATEDNS 253
#define A_PRIVATEOID 254
/*
* Values for NSEC3 algorithms
* https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml
*/
#define NSEC_SHA1 1
/*
* Values for delegation signer algorithms
* https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
*/
#define DS_SHA1 1
#define DS_SHA256 2
#define DS_GOST 3
#define DS_SHA384 4
/*
* 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.
*/
typedef struct {
nd_uint16_t id; /* query identification number */
nd_uint16_t flags; /* QR, Opcode, AA, TC, RD, RA, RCODE */
nd_uint16_t qdcount; /* number of question entries */
nd_uint16_t ancount; /* number of answer entries */
nd_uint16_t nscount; /* number of authority entries */
nd_uint16_t arcount; /* number of resource entries */
} dns_header_t;
/*
* Macros for subfields of flag fields.
*/
#define DNS_QR(flags) ((flags) & 0x8000) /* response flag */
#define DNS_OPCODE(flags) (((flags) >> 11) & 0xF) /* purpose of message */
#define DNS_AA(flags) (flags & 0x0400) /* authoritative answer */
#define DNS_TC(flags) (flags & 0x0200) /* truncated message */
#define DNS_RD(flags) (flags & 0x0100) /* recursion desired */
#define DNS_RA(flags) (flags & 0x0080) /* recursion available */
#define DNS_AD(flags) (flags & 0x0020) /* authentic data from named */
#define DNS_CD(flags) (flags & 0x0010) /* checking disabled by resolver */
#define DNS_RCODE(flags) (flags & 0x000F) /* response code */
/*
* Defines for handling compressed domain names, EDNS0 labels, etc.
*/
#define TYPE_MASK 0xc0 /* mask for the type bits of the item */
#define TYPE_INDIR 0xc0 /* 11.... - pointer */
#define TYPE_RESERVED 0x80 /* 10.... - reserved */
#define TYPE_EDNS0 0x40 /* 01.... - EDNS(0) label */
#define TYPE_LABEL 0x00 /* 00.... - regular label */
# define EDNS0_ELT_BITLABEL 0x01
#endif /* !_NAMESER_H_ */