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300 lines
11 KiB
300 lines
11 KiB
/* |
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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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/* 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_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ |
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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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/* |
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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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* 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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uint16_t id; /* query identification number */ |
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uint8_t flags1; /* first byte of flags */ |
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uint8_t flags2; /* second byte of flags */ |
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uint16_t qdcount; /* number of question entries */ |
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uint16_t ancount; /* number of answer entries */ |
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uint16_t nscount; /* number of authority entries */ |
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uint16_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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uint32_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 "uint16_t" holds 2 "chars" |
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* and that a "uint32_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) = ((uint16_t)t_cp[0] << 8) | (uint16_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) = (((uint32_t)t_cp[0]) << 24) \ |
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| (((uint32_t)t_cp[1]) << 16) \ |
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| (((uint32_t)t_cp[2]) << 8) \ |
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| (((uint32_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 uint16_t t_s = (uint16_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 uint32_t t_l = (uint32_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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