32dc912feb
IPv6 transport-ready resolvers/DNS servers. Need careful configuration when enable it. (default config is not affected). See manpage for details. XXX visible symbol __res_opt() is added, however, it is not supposed to be called from outside, libc minor is not bumped. Obtained from: KAME/NetBSD
450 lines
16 KiB
C
450 lines
16 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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/*
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* Copyright (c) 1996 by Internet Software Consortium.
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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.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM 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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/*
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* From: Id: nameser.h,v 8.16 1998/02/06 00:35:58 halley Exp
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* $FreeBSD$
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*/
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#ifndef _ARPA_NAMESER_H_
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#define _ARPA_NAMESER_H_
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#define BIND_4_COMPAT
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#include <sys/types.h>
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#include <sys/cdefs.h>
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/*
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* revision information. this is the release date in YYYYMMDD format.
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* it can change every day so the right thing to do with it is use it
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* in preprocessor commands such as "#if (__NAMESER > 19931104)". do not
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* compare for equality; rather, use it to determine whether your libnameser.a
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* is new enough to contain a certain feature.
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*/
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/* XXXRTH I made this bigger than __BIND in 4.9.5 T6B */
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#define __NAMESER 19961001 /* New interface version stamp. */
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/*
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* Define constants based on RFC 883, RFC 1034, RFC 1035
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*/
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#define NS_PACKETSZ 512 /* maximum packet size */
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#define NS_MAXDNAME 1025 /* maximum domain name */
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#define NS_MAXCDNAME 255 /* maximum compressed domain name */
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#define NS_MAXLABEL 63 /* maximum length of domain label */
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#define NS_HFIXEDSZ 12 /* #/bytes of fixed data in header */
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#define NS_QFIXEDSZ 4 /* #/bytes of fixed data in query */
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#define NS_RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
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#define NS_INT32SZ 4 /* #/bytes of data in a u_int32_t */
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#define NS_INT16SZ 2 /* #/bytes of data in a u_int16_t */
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#define NS_INT8SZ 1 /* #/bytes of data in a u_int8_t */
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#define NS_INADDRSZ 4 /* IPv4 T_A */
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#define NS_IN6ADDRSZ 16 /* IPv6 T_AAAA */
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#define NS_CMPRSFLGS 0xc0 /* Flag bits indicating name compression. */
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#define NS_DEFAULTPORT 53 /* For both TCP and UDP. */
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/*
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* These can be expanded with synonyms, just keep ns_parse.c:ns_parserecord()
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* in synch with it.
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*/
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typedef enum __ns_sect {
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ns_s_qd = 0, /* Query: Question. */
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ns_s_zn = 0, /* Update: Zone. */
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ns_s_an = 1, /* Query: Answer. */
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ns_s_pr = 1, /* Update: Prerequisites. */
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ns_s_ns = 2, /* Query: Name servers. */
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ns_s_ud = 2, /* Update: Update. */
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ns_s_ar = 3, /* Query|Update: Additional records. */
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ns_s_max = 4
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} ns_sect;
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/*
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* This is a message handle. It is caller allocated and has no dynamic data.
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* This structure is intended to be opaque to all but ns_parse.c, thus the
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* leading _'s on the member names. Use the accessor functions, not the _'s.
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*/
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typedef struct __ns_msg {
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const u_char *_msg, *_eom;
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u_int16_t _id, _flags, _counts[ns_s_max];
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const u_char *_sections[ns_s_max];
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ns_sect _sect;
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int _rrnum;
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const u_char *_ptr;
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} ns_msg;
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/* Private data structure - do not use from outside library. */
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struct _ns_flagdata { int mask, shift; };
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extern struct _ns_flagdata _ns_flagdata[];
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/* Accessor macros - this is part of the public interface. */
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#define ns_msg_getflag(handle, flag) ( \
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((handle)._flags & _ns_flagdata[flag].mask) \
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>> _ns_flagdata[flag].shift \
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)
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#define ns_msg_id(handle) ((handle)._id + 0)
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#define ns_msg_base(handle) ((handle)._msg + 0)
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#define ns_msg_end(handle) ((handle)._eom + 0)
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#define ns_msg_size(handle) ((handle)._eom - (handle)._msg)
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#define ns_msg_count(handle, section) ((handle)._counts[section] + 0)
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/*
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* This is a parsed record. It is caller allocated and has no dynamic data.
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*/
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typedef struct __ns_rr {
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char name[NS_MAXDNAME]; /* XXX need to malloc */
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u_int16_t type;
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u_int16_t rr_class;
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u_int32_t ttl;
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u_int16_t rdlength;
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const u_char *rdata;
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} ns_rr;
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/* Accessor macros - this is part of the public interface. */
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#define ns_rr_name(rr) (((rr).name[0] != '\0') ? (rr).name : ".")
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#define ns_rr_type(rr) ((rr).type + 0)
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#define ns_rr_class(rr) ((rr).rr_class + 0)
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#define ns_rr_ttl(rr) ((rr).ttl + 0)
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#define ns_rr_rdlen(rr) ((rr).rdlength + 0)
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#define ns_rr_rdata(rr) ((rr).rdata + 0)
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/*
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* These don't have to be in the same order as in the packet flags word,
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* and they can even overlap in some cases, but they will need to be kept
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* in synch with ns_parse.c:ns_flagdata[].
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*/
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typedef enum __ns_flag {
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ns_f_qr, /* Question/Response. */
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ns_f_opcode, /* Operation code. */
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ns_f_aa, /* Authoritative Answer. */
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ns_f_tc, /* Truncation occurred. */
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ns_f_rd, /* Recursion Desired. */
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ns_f_ra, /* Recursion Available. */
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ns_f_z, /* MBZ. */
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ns_f_ad, /* Authentic Data (DNSSEC). */
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ns_f_cd, /* Checking Disabled (DNSSEC). */
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ns_f_rcode, /* Response code. */
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ns_f_max
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} ns_flag;
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/*
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* Currently defined opcodes.
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*/
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typedef enum __ns_opcode {
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ns_o_query = 0, /* Standard query. */
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ns_o_iquery = 1, /* Inverse query (deprecated/unsupported). */
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ns_o_status = 2, /* Name server status query (unsupported). */
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/* Opcode 3 is undefined/reserved. */
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ns_o_notify = 4, /* Zone change notification. */
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ns_o_update = 5, /* Zone update message. */
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ns_o_max = 6
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} ns_opcode;
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/*
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* Currently defined response codes.
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*/
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typedef enum __ns_rcode {
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ns_r_noerror = 0, /* No error occurred. */
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ns_r_formerr = 1, /* Format error. */
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ns_r_servfail = 2, /* Server failure. */
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ns_r_nxdomain = 3, /* Name error. */
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ns_r_notimpl = 4, /* Unimplemented. */
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ns_r_refused = 5, /* Operation refused. */
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/* these are for BIND_UPDATE */
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ns_r_yxdomain = 6, /* Name exists */
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ns_r_yxrrset = 7, /* RRset exists */
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ns_r_nxrrset = 8, /* RRset does not exist */
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ns_r_notauth = 9, /* Not authoritative for zone */
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ns_r_notzone = 10, /* Zone of record different from zone section */
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ns_r_max = 11
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} ns_rcode;
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/* BIND_UPDATE */
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typedef enum __ns_update_operation {
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ns_uop_delete = 0,
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ns_uop_add = 1,
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ns_uop_max = 2
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} ns_update_operation;
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/*
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* This RR-like structure is particular to UPDATE.
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*/
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struct ns_updrec {
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struct ns_updrec *r_prev; /* prev record */
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struct ns_updrec *r_next; /* next record */
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u_int8_t r_section; /* ZONE/PREREQUISITE/UPDATE */
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char * r_dname; /* owner of the RR */
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u_int16_t r_class; /* class number */
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u_int16_t r_type; /* type number */
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u_int32_t r_ttl; /* time to live */
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u_char * r_data; /* rdata fields as text string */
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u_int16_t r_size; /* size of r_data field */
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int r_opcode; /* type of operation */
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/* following fields for private use by the resolver/server routines */
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struct ns_updrec *r_grpnext; /* next record when grouped */
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struct databuf *r_dp; /* databuf to process */
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struct databuf *r_deldp; /* databuf's deleted/overwritten */
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u_int16_t r_zone; /* zone number on server */
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};
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typedef struct ns_updrec ns_updrec;
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/*
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* Currently defined type values for resources and queries.
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*/
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typedef enum __ns_type {
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ns_t_a = 1, /* Host address. */
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ns_t_ns = 2, /* Authoritative server. */
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ns_t_md = 3, /* Mail destination. */
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ns_t_mf = 4, /* Mail forwarder. */
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ns_t_cname = 5, /* Canonical name. */
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ns_t_soa = 6, /* Start of authority zone. */
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ns_t_mb = 7, /* Mailbox domain name. */
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ns_t_mg = 8, /* Mail group member. */
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ns_t_mr = 9, /* Mail rename name. */
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ns_t_null = 10, /* Null resource record. */
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ns_t_wks = 11, /* Well known service. */
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ns_t_ptr = 12, /* Domain name pointer. */
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ns_t_hinfo = 13, /* Host information. */
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ns_t_minfo = 14, /* Mailbox information. */
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ns_t_mx = 15, /* Mail routing information. */
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ns_t_txt = 16, /* Text strings. */
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ns_t_rp = 17, /* Responsible person. */
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ns_t_afsdb = 18, /* AFS cell database. */
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ns_t_x25 = 19, /* X_25 calling address. */
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ns_t_isdn = 20, /* ISDN calling address. */
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ns_t_rt = 21, /* Router. */
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ns_t_nsap = 22, /* NSAP address. */
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ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */
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ns_t_sig = 24, /* Security signature. */
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ns_t_key = 25, /* Security key. */
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ns_t_px = 26, /* X.400 mail mapping. */
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ns_t_gpos = 27, /* Geographical position (withdrawn). */
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ns_t_aaaa = 28, /* Ip6 Address. */
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ns_t_loc = 29, /* Location Information. */
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ns_t_nxt = 30, /* Next domain (security). */
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ns_t_eid = 31, /* Endpoint identifier. */
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ns_t_nimloc = 32, /* Nimrod Locator. */
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ns_t_srv = 33, /* Server Selection. */
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ns_t_atma = 34, /* ATM Address */
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ns_t_naptr = 35, /* Naming Authority PoinTeR */
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ns_t_opt = 41, /* OPT pseudo-RR, RFC2761 */
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/* Query type values which do not appear in resource records. */
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ns_t_ixfr = 251, /* Incremental zone transfer. */
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ns_t_axfr = 252, /* Transfer zone of authority. */
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ns_t_mailb = 253, /* Transfer mailbox records. */
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ns_t_maila = 254, /* Transfer mail agent records. */
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ns_t_any = 255, /* Wildcard match. */
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ns_t_max = 65536
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} ns_type;
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/*
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* Values for class field
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*/
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typedef enum __ns_class {
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ns_c_in = 1, /* Internet. */
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/* Class 2 unallocated/unsupported. */
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ns_c_chaos = 3, /* MIT Chaos-net. */
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ns_c_hs = 4, /* MIT Hesiod. */
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/* Query class values which do not appear in resource records */
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ns_c_none = 254, /* for prereq. sections in update requests */
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ns_c_any = 255, /* Wildcard match. */
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ns_c_max = 65536
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} ns_class;
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/*
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* Flags field of the KEY RR rdata
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*/
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#define NS_KEY_TYPEMASK 0xC000 /* Mask for "type" bits */
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#define NS_KEY_TYPE_AUTH_CONF 0x0000 /* Key usable for both */
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#define NS_KEY_TYPE_CONF_ONLY 0x8000 /* Key usable for confidentiality */
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#define NS_KEY_TYPE_AUTH_ONLY 0x4000 /* Key usable for authentication */
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#define NS_KEY_TYPE_NO_KEY 0xC000 /* No key usable for either; no key */
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/* The type bits can also be interpreted independently, as single bits: */
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#define NS_KEY_NO_AUTH 0x8000 /* Key unusable for authentication */
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#define NS_KEY_NO_CONF 0x4000 /* Key unusable for confidentiality */
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#define NS_KEY_EXPERIMENTAL 0x2000 /* Security is *mandatory* if bit=0 */
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#define NS_KEY_RESERVED3 0x1000 /* reserved - must be zero */
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#define NS_KEY_RESERVED4 0x0800 /* reserved - must be zero */
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#define NS_KEY_USERACCOUNT 0x0400 /* key is assoc. with a user acct */
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#define NS_KEY_ENTITY 0x0200 /* key is assoc. with entity eg host */
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#define NS_KEY_ZONEKEY 0x0100 /* key is zone key */
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#define NS_KEY_IPSEC 0x0080 /* key is for IPSEC (host or user)*/
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#define NS_KEY_EMAIL 0x0040 /* key is for email (MIME security) */
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#define NS_KEY_RESERVED10 0x0020 /* reserved - must be zero */
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#define NS_KEY_RESERVED11 0x0010 /* reserved - must be zero */
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#define NS_KEY_SIGNATORYMASK 0x000F /* key can sign RR's of same name */
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#define NS_KEY_RESERVED_BITMASK ( NS_KEY_RESERVED3 | \
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NS_KEY_RESERVED4 | \
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NS_KEY_RESERVED10 | \
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NS_KEY_RESERVED11 )
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/* The Algorithm field of the KEY and SIG RR's is an integer, {1..254} */
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#define NS_ALG_MD5RSA 1 /* MD5 with RSA */
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#define NS_ALG_EXPIRE_ONLY 253 /* No alg, no security */
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#define NS_ALG_PRIVATE_OID 254 /* Key begins with OID giving alg */
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/* Signatures */
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#define NS_MD5RSA_MIN_BITS 512 /* Size of a mod or exp in bits */
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#define NS_MD5RSA_MAX_BITS 2552
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/* Total of binary mod and exp */
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#define NS_MD5RSA_MAX_BYTES ((NS_MD5RSA_MAX_BITS+7/8)*2+3)
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/* Max length of text sig block */
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#define NS_MD5RSA_MAX_BASE64 (((NS_MD5RSA_MAX_BYTES+2)/3)*4)
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/* Offsets into SIG record rdata to find various values */
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#define NS_SIG_TYPE 0 /* Type flags */
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#define NS_SIG_ALG 2 /* Algorithm */
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#define NS_SIG_LABELS 3 /* How many labels in name */
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#define NS_SIG_OTTL 4 /* Original TTL */
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#define NS_SIG_EXPIR 8 /* Expiration time */
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#define NS_SIG_SIGNED 12 /* Signature time */
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#define NS_SIG_FOOT 16 /* Key footprint */
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#define NS_SIG_SIGNER 18 /* Domain name of who signed it */
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/* How RR types are represented as bit-flags in NXT records */
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#define NS_NXT_BITS 8
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#define NS_NXT_BIT_SET( n,p) (p[(n)/NS_NXT_BITS] |= (0x80>>((n)%NS_NXT_BITS)))
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#define NS_NXT_BIT_CLEAR(n,p) (p[(n)/NS_NXT_BITS] &= ~(0x80>>((n)%NS_NXT_BITS)))
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#define NS_NXT_BIT_ISSET(n,p) (p[(n)/NS_NXT_BITS] & (0x80>>((n)%NS_NXT_BITS)))
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/*
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* Inline versions of get/put short/long. Pointer is advanced.
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*/
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#define NS_GET16(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) \
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| ((u_int16_t)t_cp[1]) \
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; \
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(cp) += NS_INT16SZ; \
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}
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#define NS_GET32(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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; \
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(cp) += NS_INT32SZ; \
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}
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#define NS_PUT16(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) += NS_INT16SZ; \
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}
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#define NS_PUT32(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) += NS_INT32SZ; \
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}
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/*
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* ANSI C identifier hiding.
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*/
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#define ns_get16 __ns_get16
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#define ns_get32 __ns_get32
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#define ns_put16 __ns_put16
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#define ns_put32 __ns_put32
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#define ns_initparse __ns_initparse
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#define ns_parserr __ns_parserr
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#define ns_sprintrr __ns_sprintrr
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#define ns_sprintrrf __ns_sprintrrf
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#define ns_format_ttl __ns_format_ttl
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#define ns_parse_ttl __ns_parse_ttl
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#define ns_name_ntop __ns_name_ntop
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#define ns_name_pton __ns_name_pton
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#define ns_name_unpack __ns_name_unpack
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#define ns_name_pack __ns_name_pack
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#define ns_name_compress __ns_name_compress
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#define ns_name_uncompress __ns_name_uncompress
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__BEGIN_DECLS
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u_int ns_get16 __P((const u_char *));
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u_long ns_get32 __P((const u_char *));
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void ns_put16 __P((u_int, u_char *));
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void ns_put32 __P((u_long, u_char *));
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int ns_initparse __P((const u_char *, int, ns_msg *));
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int ns_parserr __P((ns_msg *, ns_sect, int, ns_rr *));
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int ns_sprintrr __P((const ns_msg *, const ns_rr *,
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const char *, const char *, char *, size_t));
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int ns_sprintrrf __P((const u_char *, size_t, const char *,
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ns_class, ns_type, u_long, const u_char *,
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size_t, const char *, const char *,
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char *, size_t));
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int ns_format_ttl __P((u_long, char *, size_t));
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int ns_parse_ttl __P((const char *, u_long *));
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int ns_name_ntop __P((const u_char *, char *, size_t));
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int ns_name_pton __P((const char *, u_char *, size_t));
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int ns_name_unpack __P((const u_char *, const u_char *,
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const u_char *, u_char *, size_t));
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int ns_name_pack __P((const u_char *, u_char *, int,
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const u_char **, const u_char **));
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int ns_name_uncompress __P((const u_char *, const u_char *,
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const u_char *, char *, size_t));
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int ns_name_compress __P((const char *, u_char *, size_t,
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|
const u_char **, const u_char **));
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int ns_name_skip __P((const u_char **, const u_char *));
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__END_DECLS
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|
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#ifdef BIND_4_COMPAT
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#include <arpa/nameser_compat.h>
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#endif
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#endif /* !_ARPA_NAMESER_H_ */
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