| 1 | /* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.16 2006-11-10 03:18:21 guy Exp $ (LBL) */ |
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| 2 | /* |
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| 3 | * Copyright (c) 1983, 1989, 1993 |
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| 4 | * The Regents of the University of California. All rights reserved. |
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| 5 | * |
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| 6 | * Redistribution and use in source and binary forms, with or without |
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| 7 | * modification, are permitted provided that the following conditions |
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| 8 | * are met: |
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| 9 | * 1. Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * 3. All advertising materials mentioning features or use of this software |
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| 15 | * must display the following acknowledgement: |
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| 16 | * This product includes software developed by the University of |
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| 17 | * California, Berkeley and its contributors. |
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| 18 | * 4. Neither the name of the University nor the names of its contributors |
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| 19 | * may be used to endorse or promote products derived from this software |
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| 20 | * without specific prior written permission. |
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| 21 | * |
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| 22 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 23 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 24 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 25 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 26 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 28 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 30 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 31 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 32 | * SUCH DAMAGE. |
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| 33 | * |
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| 34 | * @(#)nameser.h 8.2 (Berkeley) 2/16/94 |
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| 35 | * - |
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| 36 | * Portions Copyright (c) 1993 by Digital Equipment Corporation. |
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| 37 | * |
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| 38 | * Permission to use, copy, modify, and distribute this software for any |
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| 39 | * purpose with or without fee is hereby granted, provided that the above |
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| 40 | * copyright notice and this permission notice appear in all copies, and that |
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| 41 | * the name of Digital Equipment Corporation not be used in advertising or |
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| 42 | * publicity pertaining to distribution of the document or software without |
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| 43 | * specific, written prior permission. |
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| 44 | * |
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| 45 | * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL |
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| 46 | * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES |
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| 47 | * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT |
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| 48 | * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
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| 49 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
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| 50 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS |
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| 51 | * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
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| 52 | * SOFTWARE. |
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| 53 | * - |
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| 54 | * --Copyright-- |
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| 55 | */ |
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| 56 | |
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| 57 | #ifndef _NAMESER_H_ |
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| 58 | #define _NAMESER_H_ |
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| 59 | |
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| 60 | #include <sys/types.h> |
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| 61 | |
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| 62 | /* |
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| 63 | * Define constants based on rfc883 |
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| 64 | */ |
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| 65 | #define PACKETSZ 512 /* maximum packet size */ |
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| 66 | #define MAXDNAME 256 /* maximum domain name */ |
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| 67 | #define MAXCDNAME 255 /* maximum compressed domain name */ |
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| 68 | #define MAXLABEL 63 /* maximum length of domain label */ |
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| 69 | /* Number of bytes of fixed size data in query structure */ |
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| 70 | #define QFIXEDSZ 4 |
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| 71 | /* number of bytes of fixed size data in resource record */ |
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| 72 | #define RRFIXEDSZ 10 |
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| 73 | |
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| 74 | /* |
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| 75 | * Internet nameserver port number |
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| 76 | */ |
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| 77 | #define NAMESERVER_PORT 53 |
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| 78 | |
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| 79 | /* |
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| 80 | * Port for multicast DNS; see |
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| 81 | * |
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| 82 | * http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt |
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| 83 | * |
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| 84 | * for the current mDNS spec. |
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| 85 | */ |
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| 86 | #define MULTICASTDNS_PORT 5353 |
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| 87 | |
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| 88 | /* |
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| 89 | * Currently defined opcodes |
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| 90 | */ |
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| 91 | #define QUERY 0x0 /* standard query */ |
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| 92 | #define IQUERY 0x1 /* inverse query */ |
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| 93 | #define STATUS 0x2 /* nameserver status query */ |
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| 94 | #if 0 |
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| 95 | #define xxx 0x3 /* 0x3 reserved */ |
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| 96 | #endif |
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| 97 | /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ |
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| 98 | #define UPDATEA 0x9 /* add resource record */ |
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| 99 | #define UPDATED 0xa /* delete a specific resource record */ |
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| 100 | #define UPDATEDA 0xb /* delete all named resource record */ |
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| 101 | #define UPDATEM 0xc /* modify a specific resource record */ |
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| 102 | #define UPDATEMA 0xd /* modify all named resource record */ |
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| 103 | |
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| 104 | #define ZONEINIT 0xe /* initial zone transfer */ |
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| 105 | #define ZONEREF 0xf /* incremental zone referesh */ |
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| 106 | |
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| 107 | /* |
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| 108 | * Undefine various #defines from various System V-flavored OSes (Solaris, |
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| 109 | * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. |
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| 110 | */ |
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| 111 | #ifdef T_NULL |
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| 112 | #undef T_NULL |
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| 113 | #endif |
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| 114 | #ifdef T_OPT |
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| 115 | #undef T_OPT |
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| 116 | #endif |
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| 117 | #ifdef T_UNSPEC |
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| 118 | #undef T_UNSPEC |
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| 119 | #endif |
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| 120 | #ifdef NOERROR |
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| 121 | #undef NOERROR |
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| 122 | #endif |
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| 123 | |
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| 124 | /* |
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| 125 | * Currently defined response codes |
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| 126 | */ |
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| 127 | #define NOERROR 0 /* no error */ |
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| 128 | #define FORMERR 1 /* format error */ |
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| 129 | #define SERVFAIL 2 /* server failure */ |
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| 130 | #define NXDOMAIN 3 /* non existent domain */ |
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| 131 | #define NOTIMP 4 /* not implemented */ |
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| 132 | #define REFUSED 5 /* query refused */ |
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| 133 | /* non standard */ |
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| 134 | #define NOCHANGE 0xf /* update failed to change db */ |
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| 135 | |
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| 136 | /* |
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| 137 | * Type values for resources and queries |
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| 138 | */ |
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| 139 | #define T_A 1 /* host address */ |
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| 140 | #define T_NS 2 /* authoritative server */ |
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| 141 | #define T_MD 3 /* mail destination */ |
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| 142 | #define T_MF 4 /* mail forwarder */ |
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| 143 | #define T_CNAME 5 /* connonical name */ |
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| 144 | #define T_SOA 6 /* start of authority zone */ |
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| 145 | #define T_MB 7 /* mailbox domain name */ |
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| 146 | #define T_MG 8 /* mail group member */ |
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| 147 | #define T_MR 9 /* mail rename name */ |
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| 148 | #define T_NULL 10 /* null resource record */ |
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| 149 | #define T_WKS 11 /* well known service */ |
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| 150 | #define T_PTR 12 /* domain name pointer */ |
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| 151 | #define T_HINFO 13 /* host information */ |
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| 152 | #define T_MINFO 14 /* mailbox information */ |
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| 153 | #define T_MX 15 /* mail routing information */ |
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| 154 | #define T_TXT 16 /* text strings */ |
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| 155 | #define T_RP 17 /* responsible person */ |
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| 156 | #define T_AFSDB 18 /* AFS cell database */ |
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| 157 | #define T_X25 19 /* X_25 calling address */ |
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| 158 | #define T_ISDN 20 /* ISDN calling address */ |
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| 159 | #define T_RT 21 /* router */ |
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| 160 | #define T_NSAP 22 /* NSAP address */ |
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| 161 | #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ |
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| 162 | #define T_SIG 24 /* security signature */ |
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| 163 | #define T_KEY 25 /* security key */ |
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| 164 | #define T_PX 26 /* X.400 mail mapping */ |
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| 165 | #define T_GPOS 27 /* geographical position (withdrawn) */ |
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| 166 | #define T_AAAA 28 /* IP6 Address */ |
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| 167 | #define T_LOC 29 /* Location Information */ |
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| 168 | #define T_NXT 30 /* Next Valid Name in Zone */ |
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| 169 | #define T_EID 31 /* Endpoint identifier */ |
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| 170 | #define T_NIMLOC 32 /* Nimrod locator */ |
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| 171 | #define T_SRV 33 /* Server selection */ |
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| 172 | #define T_ATMA 34 /* ATM Address */ |
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| 173 | #define T_NAPTR 35 /* Naming Authority PoinTeR */ |
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| 174 | #define T_KX 36 /* Key Exchanger */ |
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| 175 | #define T_CERT 37 /* Certificates in the DNS */ |
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| 176 | #define T_A6 38 /* IP6 address */ |
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| 177 | #define T_DNAME 39 /* non-terminal redirection */ |
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| 178 | #define T_SINK 40 /* unknown */ |
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| 179 | #define T_OPT 41 /* EDNS0 option (meta-RR) */ |
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| 180 | #define T_APL 42 /* lists of address prefixes */ |
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| 181 | #define T_DS 43 /* Delegation Signer */ |
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| 182 | #define T_SSHFP 44 /* SSH Fingerprint */ |
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| 183 | #define T_IPSECKEY 45 /* IPsec keying material */ |
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| 184 | #define T_RRSIG 46 /* new security signature */ |
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| 185 | #define T_NSEC 47 /* provable insecure information */ |
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| 186 | #define T_DNSKEY 48 /* new security key */ |
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| 187 | /* non standard */ |
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| 188 | #define T_SPF 99 /* sender policy framework */ |
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| 189 | #define T_UINFO 100 /* user (finger) information */ |
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| 190 | #define T_UID 101 /* user ID */ |
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| 191 | #define T_GID 102 /* group ID */ |
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| 192 | #define T_UNSPEC 103 /* Unspecified format (binary data) */ |
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| 193 | #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ |
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| 194 | /* Query type values which do not appear in resource records */ |
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| 195 | #define T_TKEY 249 /* Transaction Key [RFC2930] */ |
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| 196 | #define T_TSIG 250 /* Transaction Signature [RFC2845] */ |
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| 197 | #define T_IXFR 251 /* incremental transfer [RFC1995] */ |
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| 198 | #define T_AXFR 252 /* transfer zone of authority */ |
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| 199 | #define T_MAILB 253 /* transfer mailbox records */ |
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| 200 | #define T_MAILA 254 /* transfer mail agent records */ |
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| 201 | #define T_ANY 255 /* wildcard match */ |
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| 202 | |
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| 203 | /* |
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| 204 | * Values for class field |
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| 205 | */ |
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| 206 | |
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| 207 | #define C_IN 1 /* the arpa internet */ |
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| 208 | #define C_CHAOS 3 /* for chaos net (MIT) */ |
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| 209 | #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ |
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| 210 | /* Query class values which do not appear in resource records */ |
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| 211 | #define C_ANY 255 /* wildcard match */ |
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| 212 | #define C_QU 0x8000 /* mDNS QU flag in queries */ |
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| 213 | #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */ |
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| 214 | |
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| 215 | /* |
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| 216 | * Status return codes for T_UNSPEC conversion routines |
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| 217 | */ |
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| 218 | #define CONV_SUCCESS 0 |
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| 219 | #define CONV_OVERFLOW -1 |
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| 220 | #define CONV_BADFMT -2 |
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| 221 | #define CONV_BADCKSUM -3 |
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| 222 | #define CONV_BADBUFLEN -4 |
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| 223 | |
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| 224 | /* |
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| 225 | * Structure for query header. |
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| 226 | */ |
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| 227 | typedef struct { |
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| 228 | u_int16_t id; /* query identification number */ |
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| 229 | u_int8_t flags1; /* first byte of flags */ |
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| 230 | u_int8_t flags2; /* second byte of flags */ |
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| 231 | u_int16_t qdcount; /* number of question entries */ |
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| 232 | u_int16_t ancount; /* number of answer entries */ |
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| 233 | u_int16_t nscount; /* number of authority entries */ |
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| 234 | u_int16_t arcount; /* number of resource entries */ |
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| 235 | } HEADER; |
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| 236 | |
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| 237 | /* |
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| 238 | * Macros for subfields of flag fields. |
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| 239 | */ |
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| 240 | #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ |
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| 241 | #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ |
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| 242 | #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ |
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| 243 | #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ |
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| 244 | #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ |
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| 245 | |
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| 246 | #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ |
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| 247 | #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ |
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| 248 | #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ |
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| 249 | #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ |
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| 250 | |
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| 251 | /* |
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| 252 | * Defines for handling compressed domain names, EDNS0 labels, etc. |
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| 253 | */ |
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| 254 | #define INDIR_MASK 0xc0 /* 11.... */ |
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| 255 | #define EDNS0_MASK 0x40 /* 01.... */ |
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| 256 | # define EDNS0_ELT_BITLABEL 0x01 |
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| 257 | |
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| 258 | /* |
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| 259 | * Structure for passing resource records around. |
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| 260 | */ |
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| 261 | struct rrec { |
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| 262 | int16_t r_zone; /* zone number */ |
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| 263 | int16_t r_class; /* class number */ |
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| 264 | int16_t r_type; /* type number */ |
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| 265 | u_int32_t r_ttl; /* time to live */ |
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| 266 | int r_size; /* size of data area */ |
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| 267 | char *r_data; /* pointer to data */ |
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| 268 | }; |
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| 269 | |
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| 270 | /* |
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| 271 | * Inline versions of get/put short/long. Pointer is advanced. |
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| 272 | * We also assume that a "u_int16_t" holds 2 "chars" |
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| 273 | * and that a "u_int32_t" holds 4 "chars". |
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| 274 | * |
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| 275 | * These macros demonstrate the property of C whereby it can be |
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| 276 | * portable or it can be elegant but never both. |
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| 277 | */ |
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| 278 | #define GETSHORT(s, cp) { \ |
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| 279 | register u_char *t_cp = (u_char *)(cp); \ |
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| 280 | (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ |
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| 281 | (cp) += 2; \ |
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| 282 | } |
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| 283 | |
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| 284 | #define GETLONG(l, cp) { \ |
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| 285 | register u_char *t_cp = (u_char *)(cp); \ |
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| 286 | (l) = (((u_int32_t)t_cp[0]) << 24) \ |
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| 287 | | (((u_int32_t)t_cp[1]) << 16) \ |
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| 288 | | (((u_int32_t)t_cp[2]) << 8) \ |
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| 289 | | (((u_int32_t)t_cp[3])); \ |
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| 290 | (cp) += 4; \ |
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| 291 | } |
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| 292 | |
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| 293 | #define PUTSHORT(s, cp) { \ |
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| 294 | register u_int16_t t_s = (u_int16_t)(s); \ |
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| 295 | register u_char *t_cp = (u_char *)(cp); \ |
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| 296 | *t_cp++ = t_s >> 8; \ |
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| 297 | *t_cp = t_s; \ |
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| 298 | (cp) += 2; \ |
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| 299 | } |
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| 300 | |
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| 301 | /* |
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| 302 | * Warning: PUTLONG --no-longer-- destroys its first argument. if you |
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| 303 | * were depending on this "feature", you will lose. |
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| 304 | */ |
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| 305 | #define PUTLONG(l, cp) { \ |
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| 306 | register u_int32_t t_l = (u_int32_t)(l); \ |
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| 307 | register u_char *t_cp = (u_char *)(cp); \ |
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| 308 | *t_cp++ = t_l >> 24; \ |
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| 309 | *t_cp++ = t_l >> 16; \ |
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| 310 | *t_cp++ = t_l >> 8; \ |
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| 311 | *t_cp = t_l; \ |
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| 312 | (cp) += 4; \ |
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| 313 | } |
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| 314 | |
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| 315 | #endif /* !_NAMESER_H_ */ |
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