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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)nameser.h 8.2 (Berkeley) 2/16/94 30 * - 31 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 32 * 33 * Permission to use, copy, modify, and distribute this software for any 34 * purpose with or without fee is hereby granted, provided that the above 35 * copyright notice and this permission notice appear in all copies, and that 36 * the name of Digital Equipment Corporation not be used in advertising or 37 * publicity pertaining to distribution of the document or software without 38 * specific, written prior permission. 39 * 40 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 41 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 42 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 43 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 44 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 45 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 46 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 47 * SOFTWARE. 48 * - 49 * --Copyright-- 50 */ 51 52 #ifndef _NAMESER_H_ 53 #define _NAMESER_H_ 54 55 #include <sys/types.h> 56 57 /* 58 * Define constants based on rfc883 59 */ 60 #define PACKETSZ 512 /* maximum packet size */ 61 #define MAXDNAME 256 /* maximum domain name */ 62 #define MAXCDNAME 255 /* maximum compressed domain name */ 63 #define MAXLABEL 63 /* maximum length of domain label */ 64 /* Number of bytes of fixed size data in query structure */ 65 #define QFIXEDSZ 4 66 /* number of bytes of fixed size data in resource record */ 67 #define RRFIXEDSZ 10 68 69 /* 70 * Currently defined opcodes 71 */ 72 #define QUERY 0x0 /* standard query */ 73 #define IQUERY 0x1 /* inverse query */ 74 #define STATUS 0x2 /* nameserver status query */ 75 #if 0 76 #define xxx 0x3 /* 0x3 reserved */ 77 #endif 78 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 79 #define UPDATEA 0x9 /* add resource record */ 80 #define UPDATED 0xa /* delete a specific resource record */ 81 #define UPDATEDA 0xb /* delete all named resource record */ 82 #define UPDATEM 0xc /* modify a specific resource record */ 83 #define UPDATEMA 0xd /* modify all named resource record */ 84 85 #define ZONEINIT 0xe /* initial zone transfer */ 86 #define ZONEREF 0xf /* incremental zone referesh */ 87 88 /* 89 * Undefine various #defines from various System V-flavored OSes (Solaris, 90 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 91 */ 92 #ifdef T_NULL 93 #undef T_NULL 94 #endif 95 #ifdef T_OPT 96 #undef T_OPT 97 #endif 98 #ifdef T_UNSPEC 99 #undef T_UNSPEC 100 #endif 101 #ifdef NOERROR 102 #undef NOERROR 103 #endif 104 105 /* 106 * Currently defined response codes 107 */ 108 #define NOERROR 0 /* no error */ 109 #define FORMERR 1 /* format error */ 110 #define SERVFAIL 2 /* server failure */ 111 #define NXDOMAIN 3 /* non existent domain */ 112 #define NOTIMP 4 /* not implemented */ 113 #define REFUSED 5 /* query refused */ 114 /* non standard */ 115 #define NOCHANGE 0xf /* update failed to change db */ 116 117 /* 118 * Type values for resources and queries 119 */ 120 #define T_A 1 /* host address */ 121 #define T_NS 2 /* authoritative server */ 122 #define T_MD 3 /* mail destination */ 123 #define T_MF 4 /* mail forwarder */ 124 #define T_CNAME 5 /* connonical name */ 125 #define T_SOA 6 /* start of authority zone */ 126 #define T_MB 7 /* mailbox domain name */ 127 #define T_MG 8 /* mail group member */ 128 #define T_MR 9 /* mail rename name */ 129 #define T_NULL 10 /* null resource record */ 130 #define T_WKS 11 /* well known service */ 131 #define T_PTR 12 /* domain name pointer */ 132 #define T_HINFO 13 /* host information */ 133 #define T_MINFO 14 /* mailbox information */ 134 #define T_MX 15 /* mail routing information */ 135 #define T_TXT 16 /* text strings */ 136 #define T_RP 17 /* responsible person */ 137 #define T_AFSDB 18 /* AFS cell database */ 138 #define T_X25 19 /* X_25 calling address */ 139 #define T_ISDN 20 /* ISDN calling address */ 140 #define T_RT 21 /* router */ 141 #define T_NSAP 22 /* NSAP address */ 142 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 143 #define T_SIG 24 /* security signature */ 144 #define T_KEY 25 /* security key */ 145 #define T_PX 26 /* X.400 mail mapping */ 146 #define T_GPOS 27 /* geographical position (withdrawn) */ 147 #define T_AAAA 28 /* IP6 Address */ 148 #define T_LOC 29 /* Location Information */ 149 #define T_NXT 30 /* Next Valid Name in Zone */ 150 #define T_EID 31 /* Endpoint identifier */ 151 #define T_NIMLOC 32 /* Nimrod locator */ 152 #define T_SRV 33 /* Server selection */ 153 #define T_ATMA 34 /* ATM Address */ 154 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 155 #define T_KX 36 /* Key Exchanger */ 156 #define T_CERT 37 /* Certificates in the DNS */ 157 #define T_A6 38 /* IP6 address */ 158 #define T_DNAME 39 /* non-terminal redirection */ 159 #define T_SINK 40 /* unknown */ 160 #define T_OPT 41 /* EDNS0 option (meta-RR) */ 161 #define T_APL 42 /* lists of address prefixes */ 162 #define T_DS 43 /* Delegation Signer */ 163 #define T_SSHFP 44 /* SSH Fingerprint */ 164 #define T_IPSECKEY 45 /* IPsec keying material */ 165 #define T_RRSIG 46 /* new security signature */ 166 #define T_NSEC 47 /* provable insecure information */ 167 #define T_DNSKEY 48 /* new security key */ 168 /* non standard */ 169 #define T_SPF 99 /* sender policy framework */ 170 #define T_UINFO 100 /* user (finger) information */ 171 #define T_UID 101 /* user ID */ 172 #define T_GID 102 /* group ID */ 173 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 174 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 175 /* Query type values which do not appear in resource records */ 176 #define T_TKEY 249 /* Transaction Key [RFC2930] */ 177 #define T_TSIG 250 /* Transaction Signature [RFC2845] */ 178 #define T_IXFR 251 /* incremental transfer [RFC1995] */ 179 #define T_AXFR 252 /* transfer zone of authority */ 180 #define T_MAILB 253 /* transfer mailbox records */ 181 #define T_MAILA 254 /* transfer mail agent records */ 182 #define T_ANY 255 /* wildcard match */ 183 184 /* 185 * Values for class field 186 */ 187 188 #define C_IN 1 /* the arpa internet */ 189 #define C_CHAOS 3 /* for chaos net (MIT) */ 190 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 191 /* Query class values which do not appear in resource records */ 192 #define C_ANY 255 /* wildcard match */ 193 #define C_QU 0x8000 /* mDNS QU flag in queries */ 194 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */ 195 196 /* 197 * Status return codes for T_UNSPEC conversion routines 198 */ 199 #define CONV_SUCCESS 0 200 #define CONV_OVERFLOW -1 201 #define CONV_BADFMT -2 202 #define CONV_BADCKSUM -3 203 #define CONV_BADBUFLEN -4 204 205 /* 206 * Structure for query header. 207 */ 208 typedef struct { 209 uint16_t id; /* query identification number */ 210 uint8_t flags1; /* first byte of flags */ 211 uint8_t flags2; /* second byte of flags */ 212 uint16_t qdcount; /* number of question entries */ 213 uint16_t ancount; /* number of answer entries */ 214 uint16_t nscount; /* number of authority entries */ 215 uint16_t arcount; /* number of resource entries */ 216 } HEADER; 217 218 /* 219 * Macros for subfields of flag fields. 220 */ 221 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 222 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 223 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 224 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 225 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 226 227 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 228 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 229 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 230 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 231 232 /* 233 * Defines for handling compressed domain names, EDNS0 labels, etc. 234 */ 235 #define INDIR_MASK 0xc0 /* 11.... */ 236 #define EDNS0_MASK 0x40 /* 01.... */ 237 # define EDNS0_ELT_BITLABEL 0x01 238 239 /* 240 * Structure for passing resource records around. 241 */ 242 struct rrec { 243 int16_t r_zone; /* zone number */ 244 int16_t r_class; /* class number */ 245 int16_t r_type; /* type number */ 246 uint32_t r_ttl; /* time to live */ 247 int r_size; /* size of data area */ 248 char *r_data; /* pointer to data */ 249 }; 250 251 /* 252 * Inline versions of get/put short/long. Pointer is advanced. 253 * We also assume that a "uint16_t" holds 2 "chars" 254 * and that a "uint32_t" holds 4 "chars". 255 * 256 * These macros demonstrate the property of C whereby it can be 257 * portable or it can be elegant but never both. 258 */ 259 #define GETSHORT(s, cp) { \ 260 register u_char *t_cp = (u_char *)(cp); \ 261 (s) = ((uint16_t)t_cp[0] << 8) | (uint16_t)t_cp[1]; \ 262 (cp) += 2; \ 263 } 264 265 #define GETLONG(l, cp) { \ 266 register u_char *t_cp = (u_char *)(cp); \ 267 (l) = (((uint32_t)t_cp[0]) << 24) \ 268 | (((uint32_t)t_cp[1]) << 16) \ 269 | (((uint32_t)t_cp[2]) << 8) \ 270 | (((uint32_t)t_cp[3])); \ 271 (cp) += 4; \ 272 } 273 274 #define PUTSHORT(s, cp) { \ 275 register uint16_t t_s = (uint16_t)(s); \ 276 register u_char *t_cp = (u_char *)(cp); \ 277 *t_cp++ = t_s >> 8; \ 278 *t_cp = t_s; \ 279 (cp) += 2; \ 280 } 281 282 /* 283 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 284 * were depending on this "feature", you will lose. 285 */ 286 #define PUTLONG(l, cp) { \ 287 register uint32_t t_l = (uint32_t)(l); \ 288 register u_char *t_cp = (u_char *)(cp); \ 289 *t_cp++ = t_l >> 24; \ 290 *t_cp++ = t_l >> 16; \ 291 *t_cp++ = t_l >> 8; \ 292 *t_cp = t_l; \ 293 (cp) += 4; \ 294 } 295 296 #endif /* !_NAMESER_H_ */ 297