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 * Internet nameserver port number 75 */ 76 #define NAMESERVER_PORT 53 77 78 /* 79 * Port for multicast DNS; see 80 * 81 * http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt 82 * 83 * for the current mDNS spec. 84 */ 85 #define MULTICASTDNS_PORT 5353 86 87 /* 88 * Currently defined opcodes 89 */ 90 #define QUERY 0x0 /* standard query */ 91 #define IQUERY 0x1 /* inverse query */ 92 #define STATUS 0x2 /* nameserver status query */ 93 #if 0 94 #define xxx 0x3 /* 0x3 reserved */ 95 #endif 96 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 97 #define UPDATEA 0x9 /* add resource record */ 98 #define UPDATED 0xa /* delete a specific resource record */ 99 #define UPDATEDA 0xb /* delete all named resource record */ 100 #define UPDATEM 0xc /* modify a specific resource record */ 101 #define UPDATEMA 0xd /* modify all named resource record */ 102 103 #define ZONEINIT 0xe /* initial zone transfer */ 104 #define ZONEREF 0xf /* incremental zone referesh */ 105 106 /* 107 * Undefine various #defines from various System V-flavored OSes (Solaris, 108 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 109 */ 110 #ifdef T_NULL 111 #undef T_NULL 112 #endif 113 #ifdef T_OPT 114 #undef T_OPT 115 #endif 116 #ifdef T_UNSPEC 117 #undef T_UNSPEC 118 #endif 119 #ifdef NOERROR 120 #undef NOERROR 121 #endif 122 123 /* 124 * Currently defined response codes 125 */ 126 #define NOERROR 0 /* no error */ 127 #define FORMERR 1 /* format error */ 128 #define SERVFAIL 2 /* server failure */ 129 #define NXDOMAIN 3 /* non existent domain */ 130 #define NOTIMP 4 /* not implemented */ 131 #define REFUSED 5 /* query refused */ 132 /* non standard */ 133 #define NOCHANGE 0xf /* update failed to change db */ 134 135 /* 136 * Type values for resources and queries 137 */ 138 #define T_A 1 /* host address */ 139 #define T_NS 2 /* authoritative server */ 140 #define T_MD 3 /* mail destination */ 141 #define T_MF 4 /* mail forwarder */ 142 #define T_CNAME 5 /* connonical name */ 143 #define T_SOA 6 /* start of authority zone */ 144 #define T_MB 7 /* mailbox domain name */ 145 #define T_MG 8 /* mail group member */ 146 #define T_MR 9 /* mail rename name */ 147 #define T_NULL 10 /* null resource record */ 148 #define T_WKS 11 /* well known service */ 149 #define T_PTR 12 /* domain name pointer */ 150 #define T_HINFO 13 /* host information */ 151 #define T_MINFO 14 /* mailbox information */ 152 #define T_MX 15 /* mail routing information */ 153 #define T_TXT 16 /* text strings */ 154 #define T_RP 17 /* responsible person */ 155 #define T_AFSDB 18 /* AFS cell database */ 156 #define T_X25 19 /* X_25 calling address */ 157 #define T_ISDN 20 /* ISDN calling address */ 158 #define T_RT 21 /* router */ 159 #define T_NSAP 22 /* NSAP address */ 160 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 161 #define T_SIG 24 /* security signature */ 162 #define T_KEY 25 /* security key */ 163 #define T_PX 26 /* X.400 mail mapping */ 164 #define T_GPOS 27 /* geographical position (withdrawn) */ 165 #define T_AAAA 28 /* IP6 Address */ 166 #define T_LOC 29 /* Location Information */ 167 #define T_NXT 30 /* Next Valid Name in Zone */ 168 #define T_EID 31 /* Endpoint identifier */ 169 #define T_NIMLOC 32 /* Nimrod locator */ 170 #define T_SRV 33 /* Server selection */ 171 #define T_ATMA 34 /* ATM Address */ 172 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 173 #define T_KX 36 /* Key Exchanger */ 174 #define T_CERT 37 /* Certificates in the DNS */ 175 #define T_A6 38 /* IP6 address */ 176 #define T_DNAME 39 /* non-terminal redirection */ 177 #define T_SINK 40 /* unknown */ 178 #define T_OPT 41 /* EDNS0 option (meta-RR) */ 179 #define T_APL 42 /* lists of address prefixes */ 180 #define T_DS 43 /* Delegation Signer */ 181 #define T_SSHFP 44 /* SSH Fingerprint */ 182 #define T_IPSECKEY 45 /* IPsec keying material */ 183 #define T_RRSIG 46 /* new security signature */ 184 #define T_NSEC 47 /* provable insecure information */ 185 #define T_DNSKEY 48 /* new security key */ 186 /* non standard */ 187 #define T_SPF 99 /* sender policy framework */ 188 #define T_UINFO 100 /* user (finger) information */ 189 #define T_UID 101 /* user ID */ 190 #define T_GID 102 /* group ID */ 191 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 192 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 193 /* Query type values which do not appear in resource records */ 194 #define T_TKEY 249 /* Transaction Key [RFC2930] */ 195 #define T_TSIG 250 /* Transaction Signature [RFC2845] */ 196 #define T_IXFR 251 /* incremental transfer [RFC1995] */ 197 #define T_AXFR 252 /* transfer zone of authority */ 198 #define T_MAILB 253 /* transfer mailbox records */ 199 #define T_MAILA 254 /* transfer mail agent records */ 200 #define T_ANY 255 /* wildcard match */ 201 202 /* 203 * Values for class field 204 */ 205 206 #define C_IN 1 /* the arpa internet */ 207 #define C_CHAOS 3 /* for chaos net (MIT) */ 208 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 209 /* Query class values which do not appear in resource records */ 210 #define C_ANY 255 /* wildcard match */ 211 #define C_QU 0x8000 /* mDNS QU flag in queries */ 212 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */ 213 214 /* 215 * Status return codes for T_UNSPEC conversion routines 216 */ 217 #define CONV_SUCCESS 0 218 #define CONV_OVERFLOW -1 219 #define CONV_BADFMT -2 220 #define CONV_BADCKSUM -3 221 #define CONV_BADBUFLEN -4 222 223 /* 224 * Structure for query header. 225 */ 226 typedef struct { 227 uint16_t id; /* query identification number */ 228 uint8_t flags1; /* first byte of flags */ 229 uint8_t flags2; /* second byte of flags */ 230 uint16_t qdcount; /* number of question entries */ 231 uint16_t ancount; /* number of answer entries */ 232 uint16_t nscount; /* number of authority entries */ 233 uint16_t arcount; /* number of resource entries */ 234 } HEADER; 235 236 /* 237 * Macros for subfields of flag fields. 238 */ 239 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 240 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 241 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 242 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 243 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 244 245 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 246 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 247 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 248 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 249 250 /* 251 * Defines for handling compressed domain names, EDNS0 labels, etc. 252 */ 253 #define INDIR_MASK 0xc0 /* 11.... */ 254 #define EDNS0_MASK 0x40 /* 01.... */ 255 # define EDNS0_ELT_BITLABEL 0x01 256 257 /* 258 * Structure for passing resource records around. 259 */ 260 struct rrec { 261 int16_t r_zone; /* zone number */ 262 int16_t r_class; /* class number */ 263 int16_t r_type; /* type number */ 264 uint32_t r_ttl; /* time to live */ 265 int r_size; /* size of data area */ 266 char *r_data; /* pointer to data */ 267 }; 268 269 /* 270 * Inline versions of get/put short/long. Pointer is advanced. 271 * We also assume that a "uint16_t" holds 2 "chars" 272 * and that a "uint32_t" holds 4 "chars". 273 * 274 * These macros demonstrate the property of C whereby it can be 275 * portable or it can be elegant but never both. 276 */ 277 #define GETSHORT(s, cp) { \ 278 register u_char *t_cp = (u_char *)(cp); \ 279 (s) = ((uint16_t)t_cp[0] << 8) | (uint16_t)t_cp[1]; \ 280 (cp) += 2; \ 281 } 282 283 #define GETLONG(l, cp) { \ 284 register u_char *t_cp = (u_char *)(cp); \ 285 (l) = (((uint32_t)t_cp[0]) << 24) \ 286 | (((uint32_t)t_cp[1]) << 16) \ 287 | (((uint32_t)t_cp[2]) << 8) \ 288 | (((uint32_t)t_cp[3])); \ 289 (cp) += 4; \ 290 } 291 292 #define PUTSHORT(s, cp) { \ 293 register uint16_t t_s = (uint16_t)(s); \ 294 register u_char *t_cp = (u_char *)(cp); \ 295 *t_cp++ = t_s >> 8; \ 296 *t_cp = t_s; \ 297 (cp) += 2; \ 298 } 299 300 /* 301 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 302 * were depending on this "feature", you will lose. 303 */ 304 #define PUTLONG(l, cp) { \ 305 register uint32_t t_l = (uint32_t)(l); \ 306 register u_char *t_cp = (u_char *)(cp); \ 307 *t_cp++ = t_l >> 24; \ 308 *t_cp++ = t_l >> 16; \ 309 *t_cp++ = t_l >> 8; \ 310 *t_cp = t_l; \ 311 (cp) += 4; \ 312 } 313 314 #endif /* !_NAMESER_H_ */ 315