nameser.h revision 1.2.6.1
1 /* @(#) Header: /tcpdump/master/tcpdump/nameser.h,v 1.16 2006-11-10 03:18:21 guy Exp (LBL) */ 2 /* 3 * Copyright (c) 1983, 1989, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)nameser.h 8.2 (Berkeley) 2/16/94 31 * - 32 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 33 * 34 * Permission to use, copy, modify, and distribute this software for any 35 * purpose with or without fee is hereby granted, provided that the above 36 * copyright notice and this permission notice appear in all copies, and that 37 * the name of Digital Equipment Corporation not be used in advertising or 38 * publicity pertaining to distribution of the document or software without 39 * specific, written prior permission. 40 * 41 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 42 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 44 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 45 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 46 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 47 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 48 * SOFTWARE. 49 * - 50 * --Copyright-- 51 */ 52 53 #ifndef _NAMESER_H_ 54 #define _NAMESER_H_ 55 56 #include <sys/types.h> 57 58 /* 59 * Define constants based on rfc883 60 */ 61 #define PACKETSZ 512 /* maximum packet size */ 62 #define MAXDNAME 256 /* maximum domain name */ 63 #define MAXCDNAME 255 /* maximum compressed domain name */ 64 #define MAXLABEL 63 /* maximum length of domain label */ 65 /* Number of bytes of fixed size data in query structure */ 66 #define QFIXEDSZ 4 67 /* number of bytes of fixed size data in resource record */ 68 #define RRFIXEDSZ 10 69 70 /* 71 * Internet nameserver port number 72 */ 73 #define NAMESERVER_PORT 53 74 75 /* 76 * Port for multicast DNS; see 77 * 78 * http://files.multicastdns.org/draft-cheshire-dnsext-multicastdns.txt 79 * 80 * for the current mDNS spec. 81 */ 82 #define MULTICASTDNS_PORT 5353 83 84 /* 85 * Currently defined opcodes 86 */ 87 #define QUERY 0x0 /* standard query */ 88 #define IQUERY 0x1 /* inverse query */ 89 #define STATUS 0x2 /* nameserver status query */ 90 #if 0 91 #define xxx 0x3 /* 0x3 reserved */ 92 #endif 93 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 94 #define UPDATEA 0x9 /* add resource record */ 95 #define UPDATED 0xa /* delete a specific resource record */ 96 #define UPDATEDA 0xb /* delete all named resource record */ 97 #define UPDATEM 0xc /* modify a specific resource record */ 98 #define UPDATEMA 0xd /* modify all named resource record */ 99 100 #define ZONEINIT 0xe /* initial zone transfer */ 101 #define ZONEREF 0xf /* incremental zone referesh */ 102 103 /* 104 * Undefine various #defines from various System V-flavored OSes (Solaris, 105 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 106 */ 107 #ifdef T_NULL 108 #undef T_NULL 109 #endif 110 #ifdef T_OPT 111 #undef T_OPT 112 #endif 113 #ifdef T_UNSPEC 114 #undef T_UNSPEC 115 #endif 116 #ifdef NOERROR 117 #undef NOERROR 118 #endif 119 120 /* 121 * Currently defined response codes 122 */ 123 #define NOERROR 0 /* no error */ 124 #define FORMERR 1 /* format error */ 125 #define SERVFAIL 2 /* server failure */ 126 #define NXDOMAIN 3 /* non existent domain */ 127 #define NOTIMP 4 /* not implemented */ 128 #define REFUSED 5 /* query refused */ 129 /* non standard */ 130 #define NOCHANGE 0xf /* update failed to change db */ 131 132 /* 133 * Type values for resources and queries 134 */ 135 #define T_A 1 /* host address */ 136 #define T_NS 2 /* authoritative server */ 137 #define T_MD 3 /* mail destination */ 138 #define T_MF 4 /* mail forwarder */ 139 #define T_CNAME 5 /* connonical name */ 140 #define T_SOA 6 /* start of authority zone */ 141 #define T_MB 7 /* mailbox domain name */ 142 #define T_MG 8 /* mail group member */ 143 #define T_MR 9 /* mail rename name */ 144 #define T_NULL 10 /* null resource record */ 145 #define T_WKS 11 /* well known service */ 146 #define T_PTR 12 /* domain name pointer */ 147 #define T_HINFO 13 /* host information */ 148 #define T_MINFO 14 /* mailbox information */ 149 #define T_MX 15 /* mail routing information */ 150 #define T_TXT 16 /* text strings */ 151 #define T_RP 17 /* responsible person */ 152 #define T_AFSDB 18 /* AFS cell database */ 153 #define T_X25 19 /* X_25 calling address */ 154 #define T_ISDN 20 /* ISDN calling address */ 155 #define T_RT 21 /* router */ 156 #define T_NSAP 22 /* NSAP address */ 157 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 158 #define T_SIG 24 /* security signature */ 159 #define T_KEY 25 /* security key */ 160 #define T_PX 26 /* X.400 mail mapping */ 161 #define T_GPOS 27 /* geographical position (withdrawn) */ 162 #define T_AAAA 28 /* IP6 Address */ 163 #define T_LOC 29 /* Location Information */ 164 #define T_NXT 30 /* Next Valid Name in Zone */ 165 #define T_EID 31 /* Endpoint identifier */ 166 #define T_NIMLOC 32 /* Nimrod locator */ 167 #define T_SRV 33 /* Server selection */ 168 #define T_ATMA 34 /* ATM Address */ 169 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 170 #define T_KX 36 /* Key Exchanger */ 171 #define T_CERT 37 /* Certificates in the DNS */ 172 #define T_A6 38 /* IP6 address */ 173 #define T_DNAME 39 /* non-terminal redirection */ 174 #define T_SINK 40 /* unknown */ 175 #define T_OPT 41 /* EDNS0 option (meta-RR) */ 176 #define T_APL 42 /* lists of address prefixes */ 177 #define T_DS 43 /* Delegation Signer */ 178 #define T_SSHFP 44 /* SSH Fingerprint */ 179 #define T_IPSECKEY 45 /* IPsec keying material */ 180 #define T_RRSIG 46 /* new security signature */ 181 #define T_NSEC 47 /* provable insecure information */ 182 #define T_DNSKEY 48 /* new security key */ 183 /* non standard */ 184 #define T_SPF 99 /* sender policy framework */ 185 #define T_UINFO 100 /* user (finger) information */ 186 #define T_UID 101 /* user ID */ 187 #define T_GID 102 /* group ID */ 188 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 189 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 190 /* Query type values which do not appear in resource records */ 191 #define T_TKEY 249 /* Transaction Key [RFC2930] */ 192 #define T_TSIG 250 /* Transaction Signature [RFC2845] */ 193 #define T_IXFR 251 /* incremental transfer [RFC1995] */ 194 #define T_AXFR 252 /* transfer zone of authority */ 195 #define T_MAILB 253 /* transfer mailbox records */ 196 #define T_MAILA 254 /* transfer mail agent records */ 197 #define T_ANY 255 /* wildcard match */ 198 199 /* 200 * Values for class field 201 */ 202 203 #define C_IN 1 /* the arpa internet */ 204 #define C_CHAOS 3 /* for chaos net (MIT) */ 205 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 206 /* Query class values which do not appear in resource records */ 207 #define C_ANY 255 /* wildcard match */ 208 #define C_QU 0x8000 /* mDNS QU flag in queries */ 209 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */ 210 211 /* 212 * Status return codes for T_UNSPEC conversion routines 213 */ 214 #define CONV_SUCCESS 0 215 #define CONV_OVERFLOW -1 216 #define CONV_BADFMT -2 217 #define CONV_BADCKSUM -3 218 #define CONV_BADBUFLEN -4 219 220 /* 221 * Structure for query header. 222 */ 223 typedef struct { 224 u_int16_t id; /* query identification number */ 225 u_int8_t flags1; /* first byte of flags */ 226 u_int8_t flags2; /* second byte of flags */ 227 u_int16_t qdcount; /* number of question entries */ 228 u_int16_t ancount; /* number of answer entries */ 229 u_int16_t nscount; /* number of authority entries */ 230 u_int16_t arcount; /* number of resource entries */ 231 } HEADER; 232 233 /* 234 * Macros for subfields of flag fields. 235 */ 236 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 237 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 238 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 239 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 240 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 241 242 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 243 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 244 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 245 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 246 247 /* 248 * Defines for handling compressed domain names, EDNS0 labels, etc. 249 */ 250 #define INDIR_MASK 0xc0 /* 11.... */ 251 #define EDNS0_MASK 0x40 /* 01.... */ 252 # define EDNS0_ELT_BITLABEL 0x01 253 254 /* 255 * Structure for passing resource records around. 256 */ 257 struct rrec { 258 int16_t r_zone; /* zone number */ 259 int16_t r_class; /* class number */ 260 int16_t r_type; /* type number */ 261 u_int32_t r_ttl; /* time to live */ 262 int r_size; /* size of data area */ 263 char *r_data; /* pointer to data */ 264 }; 265 266 /* 267 * Inline versions of get/put short/long. Pointer is advanced. 268 * We also assume that a "u_int16_t" holds 2 "chars" 269 * and that a "u_int32_t" holds 4 "chars". 270 * 271 * These macros demonstrate the property of C whereby it can be 272 * portable or it can be elegant but never both. 273 */ 274 #define GETSHORT(s, cp) { \ 275 register u_char *t_cp = (u_char *)(cp); \ 276 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ 277 (cp) += 2; \ 278 } 279 280 #define GETLONG(l, cp) { \ 281 register u_char *t_cp = (u_char *)(cp); \ 282 (l) = (((u_int32_t)t_cp[0]) << 24) \ 283 | (((u_int32_t)t_cp[1]) << 16) \ 284 | (((u_int32_t)t_cp[2]) << 8) \ 285 | (((u_int32_t)t_cp[3])); \ 286 (cp) += 4; \ 287 } 288 289 #define PUTSHORT(s, cp) { \ 290 register u_int16_t t_s = (u_int16_t)(s); \ 291 register u_char *t_cp = (u_char *)(cp); \ 292 *t_cp++ = t_s >> 8; \ 293 *t_cp = t_s; \ 294 (cp) += 2; \ 295 } 296 297 /* 298 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 299 * were depending on this "feature", you will lose. 300 */ 301 #define PUTLONG(l, cp) { \ 302 register u_int32_t t_l = (u_int32_t)(l); \ 303 register u_char *t_cp = (u_char *)(cp); \ 304 *t_cp++ = t_l >> 24; \ 305 *t_cp++ = t_l >> 16; \ 306 *t_cp++ = t_l >> 8; \ 307 *t_cp = t_l; \ 308 (cp) += 4; \ 309 } 310 311 #endif /* !_NAMESER_H_ */ 312
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