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332 lines
13 KiB
C
332 lines
13 KiB
C
/*
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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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* 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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* Undefine various #defines from various System V-flavored OSes (Solaris,
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* SINIX, HP-UX) so the compiler doesn't whine that we redefine them.
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*/
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#ifdef T_NULL
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#undef T_NULL
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#endif
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#ifdef T_OPT
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#undef T_OPT
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#endif
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#ifdef T_UNSPEC
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#undef T_UNSPEC
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#endif
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#ifdef NOERROR
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#undef NOERROR
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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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/* 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_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 lookup for NSAP */
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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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#define T_NXT 30 /* Next Valid Name in Zone */
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#define T_EID 31 /* Endpoint identifier */
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#define T_NIMLOC 32 /* Nimrod locator */
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#define T_SRV 33 /* Server selection */
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#define T_ATMA 34 /* ATM Address */
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#define T_NAPTR 35 /* Naming Authority PoinTeR */
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#define T_KX 36 /* Key Exchanger */
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#define T_CERT 37 /* Certificates in the DNS */
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#define T_A6 38 /* IP6 address */
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#define T_DNAME 39 /* non-terminal redirection */
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#define T_SINK 40 /* unknown */
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#define T_OPT 41 /* EDNS0 option (meta-RR) */
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#define T_APL 42 /* lists of address prefixes */
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#define T_DS 43 /* Delegation Signer */
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#define T_SSHFP 44 /* SSH Fingerprint */
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#define T_IPSECKEY 45 /* IPsec keying material */
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#define T_RRSIG 46 /* new security signature */
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#define T_NSEC 47 /* provable insecure information */
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#define T_DNSKEY 48 /* new security key */
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#define T_DHCID 49 /* DHCP IDentifier */
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#define T_NSEC3 50 /* Next SECure record v3 */
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#define T_NSEC3PARAM 51 /* NSEC3 PARAMeter */
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#define T_TLSA 52 /* TLS Authentication */
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#define T_SMIMEA 53 /* S/MIME Authentication */
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/* Unassigned */
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#define T_HIP 55 /* Host Identity Protocol */
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#define T_NINFO 56 /* zone status information */
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#define T_RKEY 57 /* Record encryption KEY */
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#define T_TALINK 58 /* Trust Anchor LINK */
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#define T_CDS 59 /* Child Delegation Signer */
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#define T_CDNSKEY 60 /* Child DNSKEY */
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#define T_OPENPGPKEY 61 /* OpenPGP KEY */
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#define T_CSYNC 62 /* Child to parent SYNChronization */
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#define T_ZONEMD 63 /* ZONE data Message Digest */
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#define T_SVCB 64 /* SerViCe Binding */
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#define T_HTTPS 65 /* HTTPS binding */
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/* non standard */
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#define T_SPF 99 /* sender policy framework */
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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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#define T_NID 104 /* Node IDentifier */
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#define T_L32 105 /* Locator 32-bit */
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#define T_L64 106 /* Locator 64-bit */
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#define T_LP 107 /* Locator Pointer */
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#define T_EUI48 108 /* an EUI-48 address */
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#define T_EUI64 109 /* an EUI-64 address */
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/* Query type values which do not appear in resource records */
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#define T_TKEY 249 /* Transaction Key [RFC2930] */
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#define T_TSIG 250 /* Transaction Signature [RFC2845] */
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#define T_IXFR 251 /* incremental transfer [RFC1995] */
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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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#define T_URI 256 /* uri records [RFC7553] */
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#define T_CAA 257 /* Certification Authority Authorization */
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#define T_AVC 258 /* Application Visibility and Control */
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#define T_DOA 259 /* Digital Object Architecture */
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#define T_AMTRELAY 260 /* Automatic Multicast Tunneling RELAY */
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#define T_TA 32768 /* DNSSEC Trust Authorities */
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#define T_DLV 32769 /* DNSSEC Lookaside Validation */
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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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#define C_QU 0x8000 /* mDNS QU flag in queries */
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#define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */
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/*
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* Values for EDNS option types
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*/
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#define E_LLQ 1 /* long lived queries protocol */
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#define E_UL 2 /* dynamic dns update leases */
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#define E_NSID 3 /* name server identifier */
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#define E_DAU 5 /* signal DNSSEC algorithm understood */
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#define E_DHU 6 /* signal DS hash understood */
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#define E_N3U 7 /* signal NSEC3 hash understood */
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#define E_ECS 8 /* EDNS client subnet */
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#define E_EXPIRE 9 /* zone expiration */
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#define E_COOKIE 10 /* DNS cookies */
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#define E_KEEPALIVE 11 /* TCP keepalive */
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#define E_PADDING 12 /* pad DNS messages */
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#define E_CHAIN 13 /* chain DNS queries */
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#define E_KEYTAG 14 /* EDNS key tag */
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#define E_CLIENTTAG 16 /* EDNS client tag */
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#define E_SERVERTAG 17 /* EDNS server tag */
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/*
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* Values for DNSSEC Algorithms
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* https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
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*/
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#define A_DELETE 0
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#define A_RSAMD5 1
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#define A_DH 2
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#define A_DSA 3
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#define A_RSASHA1 5
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#define A_DSA_NSEC3_SHA1 6
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#define A_RSASHA1_NSEC3_SHA1 7
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#define A_RSASHA256 8
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#define A_RSASHA512 10
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#define A_ECC_GOST 12
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#define A_ECDSAP256SHA256 13
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#define A_ECDSAP384SHA384 14
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#define A_ED25519 15
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#define A_ED448 16
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#define A_INDIRECT 252
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#define A_PRIVATEDNS 253
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#define A_PRIVATEOID 254
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/*
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* Values for NSEC3 algorithms
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* https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml
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*/
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#define NSEC_SHA1 1
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/*
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* Values for delegation signer algorithms
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* https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
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*/
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#define DS_SHA1 1
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#define DS_SHA256 2
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#define DS_GOST 3
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#define DS_SHA384 4
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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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nd_uint16_t id; /* query identification number */
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nd_uint16_t flags; /* QR, Opcode, AA, TC, RD, RA, RCODE */
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nd_uint16_t qdcount; /* number of question entries */
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nd_uint16_t ancount; /* number of answer entries */
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nd_uint16_t nscount; /* number of authority entries */
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nd_uint16_t arcount; /* number of resource entries */
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} dns_header_t;
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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(flags) ((flags) & 0x8000) /* response flag */
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#define DNS_OPCODE(flags) (((flags) >> 11) & 0xF) /* purpose of message */
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#define DNS_AA(flags) (flags & 0x0400) /* authoritative answer */
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#define DNS_TC(flags) (flags & 0x0200) /* truncated message */
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#define DNS_RD(flags) (flags & 0x0100) /* recursion desired */
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#define DNS_RA(flags) (flags & 0x0080) /* recursion available */
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#define DNS_AD(flags) (flags & 0x0020) /* authentic data from named */
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#define DNS_CD(flags) (flags & 0x0010) /* checking disabled by resolver */
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#define DNS_RCODE(flags) (flags & 0x000F) /* 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 TYPE_MASK 0xc0 /* mask for the type bits of the item */
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#define TYPE_INDIR 0xc0 /* 11.... - pointer */
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#define TYPE_RESERVED 0x80 /* 10.... - reserved */
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#define TYPE_EDNS0 0x40 /* 01.... - EDNS(0) label */
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#define TYPE_LABEL 0x00 /* 00.... - regular label */
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# define EDNS0_ELT_BITLABEL 0x01
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#endif /* !_NAMESER_H_ */
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