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 /* non standard */ 173 #define T_SPF 99 /* sender policy framework */ 174 #define T_UINFO 100 /* user (finger) information */ 175 #define T_UID 101 /* user ID */ 176 #define T_GID 102 /* group ID */ 177 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 178 #define T_UNSPECA 104 /* "unspecified ASCII". Ugly MIT hack */ 179 /* Query type values which do not appear in resource records */ 180 #define T_TKEY 249 /* Transaction Key [RFC2930] */ 181 #define T_TSIG 250 /* Transaction Signature [RFC2845] */ 182 #define T_IXFR 251 /* incremental transfer [RFC1995] */ 183 #define T_AXFR 252 /* transfer zone of authority */ 184 #define T_MAILB 253 /* transfer mailbox records */ 185 #define T_MAILA 254 /* transfer mail agent records */ 186 #define T_ANY 255 /* wildcard match */ 187 #define T_URI 256 /* uri records [RFC7553] */ 188 189 /* 190 * Values for class field 191 */ 192 193 #define C_IN 1 /* the arpa internet */ 194 #define C_CHAOS 3 /* for chaos net (MIT) */ 195 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 196 /* Query class values which do not appear in resource records */ 197 #define C_ANY 255 /* wildcard match */ 198 #define C_QU 0x8000 /* mDNS QU flag in queries */ 199 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */ 200 201 /* 202 * Values for EDNS option types 203 */ 204 #define E_LLQ 1 /* long lived queries protocol */ 205 #define E_UL 2 /* dynamic dns update leases */ 206 #define E_NSID 3 /* name server identifier */ 207 #define E_DAU 5 /* signal DNSSEC algorithm understood */ 208 #define E_DHU 6 /* signal DS hash understood */ 209 #define E_N3U 7 /* signal NSEC3 hash understood */ 210 #define E_ECS 8 /* EDNS client subnet */ 211 #define E_EXPIRE 9 /* zone expiration */ 212 #define E_COOKIE 10 /* DNS cookies */ 213 #define E_KEEPALIVE 11 /* TCP keepalive */ 214 #define E_PADDING 12 /* pad DNS messages */ 215 #define E_CHAIN 13 /* chain DNS queries */ 216 #define E_KEYTAG 14 /* EDNS key tag */ 217 #define E_CLIENTTAG 16 /* EDNS client tag */ 218 #define E_SERVERTAG 17 /* EDNS server tag */ 219 220 /* 221 * Values for DNSSEC Algorithms 222 * https://www.iana.org/assignments/dns-sec-alg-numbers/dns-sec-alg-numbers.xhtml 223 */ 224 225 #define A_DELETE 0 226 #define A_RSAMD5 1 227 #define A_DH 2 228 #define A_DSA 3 229 #define A_RSASHA1 5 230 #define A_DSA_NSEC3_SHA1 6 231 #define A_RSASHA1_NSEC3_SHA1 7 232 #define A_RSASHA256 8 233 #define A_RSASHA512 10 234 #define A_ECC_GOST 12 235 #define A_ECDSAP256SHA256 13 236 #define A_ECDSAP384SHA384 14 237 #define A_ED25519 15 238 #define A_ED448 16 239 #define A_INDIRECT 252 240 #define A_PRIVATEDNS 253 241 #define A_PRIVATEOID 254 242 243 /* 244 * Values for NSEC3 algorithms 245 * https://www.iana.org/assignments/dnssec-nsec3-parameters/dnssec-nsec3-parameters.xhtml 246 */ 247 #define NSEC_SHA1 1 248 249 /* 250 * Values for delegation signer algorithms 251 * https://www.iana.org/assignments/ds-rr-types/ds-rr-types.xhtml 252 */ 253 #define DS_SHA1 1 254 #define DS_SHA256 2 255 #define DS_GOST 3 256 #define DS_SHA384 4 257 258 259 /* 260 * Status return codes for T_UNSPEC conversion routines 261 */ 262 #define CONV_SUCCESS 0 263 #define CONV_OVERFLOW -1 264 #define CONV_BADFMT -2 265 #define CONV_BADCKSUM -3 266 #define CONV_BADBUFLEN -4 267 268 /* 269 * Structure for query header. 270 */ 271 typedef struct { 272 nd_uint16_t id; /* query identification number */ 273 nd_uint16_t flags; /* QR, Opcode, AA, TC, RD, RA, RCODE */ 274 nd_uint16_t qdcount; /* number of question entries */ 275 nd_uint16_t ancount; /* number of answer entries */ 276 nd_uint16_t nscount; /* number of authority entries */ 277 nd_uint16_t arcount; /* number of resource entries */ 278 } dns_header_t; 279 280 /* 281 * Macros for subfields of flag fields. 282 */ 283 #define DNS_QR(flags) ((flags) & 0x8000) /* response flag */ 284 #define DNS_OPCODE(flags) (((flags) >> 11) & 0xF) /* purpose of message */ 285 #define DNS_AA(flags) (flags & 0x0400) /* authoritative answer */ 286 #define DNS_TC(flags) (flags & 0x0200) /* truncated message */ 287 #define DNS_RD(flags) (flags & 0x0100) /* recursion desired */ 288 #define DNS_RA(flags) (flags & 0x0080) /* recursion available */ 289 #define DNS_AD(flags) (flags & 0x0020) /* authentic data from named */ 290 #define DNS_CD(flags) (flags & 0x0010) /* checking disabled by resolver */ 291 #define DNS_RCODE(flags) (flags & 0x000F) /* response code */ 292 293 /* 294 * Defines for handling compressed domain names, EDNS0 labels, etc. 295 */ 296 #define TYPE_MASK 0xc0 /* mask for the type bits of the item */ 297 #define TYPE_INDIR 0xc0 /* 11.... - pointer */ 298 #define TYPE_RESERVED 0x80 /* 10.... - reserved */ 299 #define TYPE_EDNS0 0x40 /* 01.... - EDNS(0) label */ 300 #define TYPE_LABEL 0x00 /* 00.... - regular label */ 301 # define EDNS0_ELT_BITLABEL 0x01 302 303 #endif /* !_NAMESER_H_ */ 304