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[tcpdump] / nameser.h
1 /*
2 * Copyright (c) 1983, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)nameser.h 8.2 (Berkeley) 2/16/94
34 * -
35 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
36 *
37 * Permission to use, copy, modify, and distribute this software for any
38 * purpose with or without fee is hereby granted, provided that the above
39 * copyright notice and this permission notice appear in all copies, and that
40 * the name of Digital Equipment Corporation not be used in advertising or
41 * publicity pertaining to distribution of the document or software without
42 * specific, written prior permission.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
45 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
46 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
47 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
48 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
49 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
50 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
51 * SOFTWARE.
52 * -
53 * --Copyright--
54 */
55
56 #ifndef _NAMESER_H_
57 #define _NAMESER_H_
58
59 #include <sys/types.h>
60
61 /*
62 * Define constants based on rfc883
63 */
64 #define PACKETSZ 512 /* maximum packet size */
65 #define MAXDNAME 256 /* maximum domain name */
66 #define MAXCDNAME 255 /* maximum compressed domain name */
67 #define MAXLABEL 63 /* maximum length of domain label */
68 /* Number of bytes of fixed size data in query structure */
69 #define QFIXEDSZ 4
70 /* number of bytes of fixed size data in resource record */
71 #define RRFIXEDSZ 10
72
73 /*
74 * Currently defined opcodes
75 */
76 #define QUERY 0x0 /* standard query */
77 #define IQUERY 0x1 /* inverse query */
78 #define STATUS 0x2 /* nameserver status query */
79 #if 0
80 #define xxx 0x3 /* 0x3 reserved */
81 #endif
82 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */
83 #define UPDATEA 0x9 /* add resource record */
84 #define UPDATED 0xa /* delete a specific resource record */
85 #define UPDATEDA 0xb /* delete all named resource record */
86 #define UPDATEM 0xc /* modify a specific resource record */
87 #define UPDATEMA 0xd /* modify all named resource record */
88
89 #define ZONEINIT 0xe /* initial zone transfer */
90 #define ZONEREF 0xf /* incremental zone referesh */
91
92 /*
93 * Undefine various #defines from various System V-flavored OSes (Solaris,
94 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them.
95 */
96 #ifdef T_NULL
97 #undef T_NULL
98 #endif
99 #ifdef T_OPT
100 #undef T_OPT
101 #endif
102 #ifdef T_UNSPEC
103 #undef T_UNSPEC
104 #endif
105 #ifdef NOERROR
106 #undef NOERROR
107 #endif
108
109 /*
110 * Currently defined response codes
111 */
112 #define NOERROR 0 /* no error */
113 #define FORMERR 1 /* format error */
114 #define SERVFAIL 2 /* server failure */
115 #define NXDOMAIN 3 /* non existent domain */
116 #define NOTIMP 4 /* not implemented */
117 #define REFUSED 5 /* query refused */
118 /* non standard */
119 #define NOCHANGE 0xf /* update failed to change db */
120
121 /*
122 * Type values for resources and queries
123 */
124 #define T_A 1 /* host address */
125 #define T_NS 2 /* authoritative server */
126 #define T_MD 3 /* mail destination */
127 #define T_MF 4 /* mail forwarder */
128 #define T_CNAME 5 /* connonical name */
129 #define T_SOA 6 /* start of authority zone */
130 #define T_MB 7 /* mailbox domain name */
131 #define T_MG 8 /* mail group member */
132 #define T_MR 9 /* mail rename name */
133 #define T_NULL 10 /* null resource record */
134 #define T_WKS 11 /* well known service */
135 #define T_PTR 12 /* domain name pointer */
136 #define T_HINFO 13 /* host information */
137 #define T_MINFO 14 /* mailbox information */
138 #define T_MX 15 /* mail routing information */
139 #define T_TXT 16 /* text strings */
140 #define T_RP 17 /* responsible person */
141 #define T_AFSDB 18 /* AFS cell database */
142 #define T_X25 19 /* X_25 calling address */
143 #define T_ISDN 20 /* ISDN calling address */
144 #define T_RT 21 /* router */
145 #define T_NSAP 22 /* NSAP address */
146 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */
147 #define T_SIG 24 /* security signature */
148 #define T_KEY 25 /* security key */
149 #define T_PX 26 /* X.400 mail mapping */
150 #define T_GPOS 27 /* geographical position (withdrawn) */
151 #define T_AAAA 28 /* IP6 Address */
152 #define T_LOC 29 /* Location Information */
153 #define T_NXT 30 /* Next Valid Name in Zone */
154 #define T_EID 31 /* Endpoint identifier */
155 #define T_NIMLOC 32 /* Nimrod locator */
156 #define T_SRV 33 /* Server selection */
157 #define T_ATMA 34 /* ATM Address */
158 #define T_NAPTR 35 /* Naming Authority PoinTeR */
159 #define T_KX 36 /* Key Exchanger */
160 #define T_CERT 37 /* Certificates in the DNS */
161 #define T_A6 38 /* IP6 address */
162 #define T_DNAME 39 /* non-terminal redirection */
163 #define T_SINK 40 /* unknown */
164 #define T_OPT 41 /* EDNS0 option (meta-RR) */
165 #define T_APL 42 /* lists of address prefixes */
166 #define T_DS 43 /* Delegation Signer */
167 #define T_SSHFP 44 /* SSH Fingerprint */
168 #define T_IPSECKEY 45 /* IPsec keying material */
169 #define T_RRSIG 46 /* new security signature */
170 #define T_NSEC 47 /* provable insecure information */
171 #define T_DNSKEY 48 /* new security key */
172 #define T_DHCID 49 /* DHCP IDentifier */
173 #define T_NSEC3 50 /* Next SECure record v3 */
174 #define T_NSEC3PARAM 51 /* NSEC3 PARAMeter */
175 #define T_TLSA 52 /* TLS Authentication */
176 #define T_SMIMEA 53 /* S/MIME Authentication */
177 /* Unassigned */
178 #define T_HIP 55 /* Host Identity Protocol */
179 #define T_NINFO 56 /* zone status information */
180 #define T_RKEY 57 /* Record encryption KEY */
181 #define T_TALINK 58 /* Trust Anchor LINK */
182 #define T_CDS 59 /* Child Delegation Signer */
183 #define T_CDNSKEY 60 /* Child DNSKEY */
184 #define T_OPENPGPKEY 61 /* OpenPGP KEY */
185 #define T_CSYNC 62 /* Child to parent SYNChronization */
186 #define T_ZONEMD 63 /* ZONE data Message Digest */
187 #define T_SVCB 64 /* SerViCe Binding */
188 #define T_HTTPS 65 /* HTTPS binding */
189 /* non standard */
190 #define T_SPF 99 /* sender policy framework */
191 #define T_UINFO 100 /* user (finger) information */
192 #define T_UID 101 /* user ID */
193 #define T_GID 102 /* group ID */
194 #define T_UNSPEC 103 /* Unspecified format (binary data) */
195 #define T_NID 104 /* Node IDentifier */
196 #define T_L32 105 /* Locator 32-bit */
197 #define T_L64 106 /* Locator 64-bit */
198 #define T_LP 107 /* Locator Pointer */
199 #define T_EUI48 108 /* an EUI-48 address */
200 #define T_EUI64 109 /* an EUI-64 address */
201 /* Query type values which do not appear in resource records */
202 #define T_TKEY 249 /* Transaction Key [RFC2930] */
203 #define T_TSIG 250 /* Transaction Signature [RFC2845] */
204 #define T_IXFR 251 /* incremental transfer [RFC1995] */
205 #define T_AXFR 252 /* transfer zone of authority */
206 #define T_MAILB 253 /* transfer mailbox records */
207 #define T_MAILA 254 /* transfer mail agent records */
208 #define T_ANY 255 /* wildcard match */
209 #define T_URI 256 /* uri records [RFC7553] */
210 #define T_CAA 257 /* Certification Authority Authorization */
211 #define T_AVC 258 /* Application Visibility and Control */
212 #define T_DOA 259 /* Digital Object Architecture */
213 #define T_AMTRELAY 260 /* Automatic Multicast Tunneling RELAY */
214 #define T_TA 32768 /* DNSSEC Trust Authorities */
215 #define T_DLV 32769 /* DNSSEC Lookaside Validation */
216
217 /*
218 * Values for class field
219 */
220
221 #define C_IN 1 /* the arpa internet */
222 #define C_CHAOS 3 /* for chaos net (MIT) */
223 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
224 /* Query class values which do not appear in resource records */
225 #define C_ANY 255 /* wildcard match */
226 #define C_QU 0x8000 /* mDNS QU flag in queries */
227 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */
228
229 /*
230 * Values for EDNS option types
231 */
232 #define E_LLQ 1 /* long lived queries protocol */
233 #define E_UL 2 /* dynamic dns update leases */
234 #define E_NSID 3 /* name server identifier */
235 #define E_DAU 5 /* signal DNSSEC algorithm understood */
236 #define E_DHU 6 /* signal DS hash understood */
237 #define E_N3U 7 /* signal NSEC3 hash understood */
238 #define E_ECS 8 /* EDNS client subnet */
239 #define E_EXPIRE 9 /* zone expiration */
240 #define E_COOKIE 10 /* DNS cookies */
241 #define E_KEEPALIVE 11 /* TCP keepalive */
242 #define E_PADDING 12 /* pad DNS messages */
243 #define E_CHAIN 13 /* chain DNS queries */
244 #define E_KEYTAG 14 /* EDNS key tag */
245 #define E_CLIENTTAG 16 /* EDNS client tag */
246 #define E_SERVERTAG 17 /* EDNS server tag */
247
248 /*
249 * Values for DNSSEC Algorithms
250 * https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml
251 */
252
253 #define A_DELETE 0
254 #define A_RSAMD5 1
255 #define A_DH 2
256 #define A_DSA 3
257 #define A_RSASHA1 5
258 #define A_DSA_NSEC3_SHA1 6
259 #define A_RSASHA1_NSEC3_SHA1 7
260 #define A_RSASHA256 8
261 #define A_RSASHA512 10
262 #define A_ECC_GOST 12
263 #define A_ECDSAP256SHA256 13
264 #define A_ECDSAP384SHA384 14
265 #define A_ED25519 15
266 #define A_ED448 16
267 #define A_INDIRECT 252
268 #define A_PRIVATEDNS 253
269 #define A_PRIVATEOID 254
270
271 /*
272 * Values for NSEC3 algorithms
273 * https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml
274 */
275 #define NSEC_SHA1 1
276
277 /*
278 * Values for delegation signer algorithms
279 * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml
280 */
281 #define DS_SHA1 1
282 #define DS_SHA256 2
283 #define DS_GOST 3
284 #define DS_SHA384 4
285
286
287 /*
288 * Status return codes for T_UNSPEC conversion routines
289 */
290 #define CONV_SUCCESS 0
291 #define CONV_OVERFLOW -1
292 #define CONV_BADFMT -2
293 #define CONV_BADCKSUM -3
294 #define CONV_BADBUFLEN -4
295
296 /*
297 * Structure for query header.
298 */
299 typedef struct {
300 nd_uint16_t id; /* query identification number */
301 nd_uint16_t flags; /* QR, Opcode, AA, TC, RD, RA, RCODE */
302 nd_uint16_t qdcount; /* number of question entries */
303 nd_uint16_t ancount; /* number of answer entries */
304 nd_uint16_t nscount; /* number of authority entries */
305 nd_uint16_t arcount; /* number of resource entries */
306 } dns_header_t;
307
308 /*
309 * Macros for subfields of flag fields.
310 */
311 #define DNS_QR(flags) ((flags) & 0x8000) /* response flag */
312 #define DNS_OPCODE(flags) (((flags) >> 11) & 0xF) /* purpose of message */
313 #define DNS_AA(flags) (flags & 0x0400) /* authoritative answer */
314 #define DNS_TC(flags) (flags & 0x0200) /* truncated message */
315 #define DNS_RD(flags) (flags & 0x0100) /* recursion desired */
316 #define DNS_RA(flags) (flags & 0x0080) /* recursion available */
317 #define DNS_AD(flags) (flags & 0x0020) /* authentic data from named */
318 #define DNS_CD(flags) (flags & 0x0010) /* checking disabled by resolver */
319 #define DNS_RCODE(flags) (flags & 0x000F) /* response code */
320
321 /*
322 * Defines for handling compressed domain names, EDNS0 labels, etc.
323 */
324 #define TYPE_MASK 0xc0 /* mask for the type bits of the item */
325 #define TYPE_INDIR 0xc0 /* 11.... - pointer */
326 #define TYPE_RESERVED 0x80 /* 10.... - reserved */
327 #define TYPE_EDNS0 0x40 /* 01.... - EDNS(0) label */
328 #define TYPE_LABEL 0x00 /* 00.... - regular label */
329 # define EDNS0_ELT_BITLABEL 0x01
330
331 #endif /* !_NAMESER_H_ */
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