1 /* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.14 2003/11/05 06:02:59 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. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nameser.h 8.2 (Berkeley) 2/16/94 35 * - 36 * Portions Copyright (c) 1993 by Digital Equipment Corporation. 37 * 38 * Permission to use, copy, modify, and distribute this software for any 39 * purpose with or without fee is hereby granted, provided that the above 40 * copyright notice and this permission notice appear in all copies, and that 41 * the name of Digital Equipment Corporation not be used in advertising or 42 * publicity pertaining to distribution of the document or software without 43 * specific, written prior permission. 44 * 45 * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL 46 * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES 47 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT 48 * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL 49 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR 50 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS 51 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS 52 * SOFTWARE. 53 * - 54 * --Copyright-- 55 */ 56 57 #ifndef _NAMESER_H_ 58 #define _NAMESER_H_ 59 60 #include <sys/types.h> 61 62 /* 63 * Define constants based on rfc883 64 */ 65 #define PACKETSZ 512 /* maximum packet size */ 66 #define MAXDNAME 256 /* maximum domain name */ 67 #define MAXCDNAME 255 /* maximum compressed domain name */ 68 #define MAXLABEL 63 /* maximum length of domain label */ 69 /* Number of bytes of fixed size data in query structure */ 70 #define QFIXEDSZ 4 71 /* number of bytes of fixed size data in resource record */ 72 #define RRFIXEDSZ 10 73 74 /* 75 * Internet nameserver port number 76 */ 77 #define NAMESERVER_PORT 53 78 #define MULTICASTDNS_PORT 5353 79 80 /* 81 * Currently defined opcodes 82 */ 83 #define QUERY 0x0 /* standard query */ 84 #define IQUERY 0x1 /* inverse query */ 85 #define STATUS 0x2 /* nameserver status query */ 86 #if 0 87 #define xxx 0x3 /* 0x3 reserved */ 88 #endif 89 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 90 #define UPDATEA 0x9 /* add resource record */ 91 #define UPDATED 0xa /* delete a specific resource record */ 92 #define UPDATEDA 0xb /* delete all named resource record */ 93 #define UPDATEM 0xc /* modify a specific resource record */ 94 #define UPDATEMA 0xd /* modify all named resource record */ 95 96 #define ZONEINIT 0xe /* initial zone transfer */ 97 #define ZONEREF 0xf /* incremental zone referesh */ 98 99 /* 100 * Undefine various #defines from various System V-flavored OSes (Solaris, 101 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 102 */ 103 #ifdef T_NULL 104 #undef T_NULL 105 #endif 106 #ifdef T_OPT 107 #undef T_OPT 108 #endif 109 #ifdef T_UNSPEC 110 #undef T_UNSPEC 111 #endif 112 #ifdef NOERROR 113 #undef NOERROR 114 #endif 115 116 /* 117 * Currently defined response codes 118 */ 119 #define NOERROR 0 /* no error */ 120 #define FORMERR 1 /* format error */ 121 #define SERVFAIL 2 /* server failure */ 122 #define NXDOMAIN 3 /* non existent domain */ 123 #define NOTIMP 4 /* not implemented */ 124 #define REFUSED 5 /* query refused */ 125 /* non standard */ 126 #define NOCHANGE 0xf /* update failed to change db */ 127 128 /* 129 * Type values for resources and queries 130 */ 131 #define T_A 1 /* host address */ 132 #define T_NS 2 /* authoritative server */ 133 #define T_MD 3 /* mail destination */ 134 #define T_MF 4 /* mail forwarder */ 135 #define T_CNAME 5 /* connonical name */ 136 #define T_SOA 6 /* start of authority zone */ 137 #define T_MB 7 /* mailbox domain name */ 138 #define T_MG 8 /* mail group member */ 139 #define T_MR 9 /* mail rename name */ 140 #define T_NULL 10 /* null resource record */ 141 #define T_WKS 11 /* well known service */ 142 #define T_PTR 12 /* domain name pointer */ 143 #define T_HINFO 13 /* host information */ 144 #define T_MINFO 14 /* mailbox information */ 145 #define T_MX 15 /* mail routing information */ 146 #define T_TXT 16 /* text strings */ 147 #define T_RP 17 /* responsible person */ 148 #define T_AFSDB 18 /* AFS cell database */ 149 #define T_X25 19 /* X_25 calling address */ 150 #define T_ISDN 20 /* ISDN calling address */ 151 #define T_RT 21 /* router */ 152 #define T_NSAP 22 /* NSAP address */ 153 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 154 #define T_SIG 24 /* security signature */ 155 #define T_KEY 25 /* security key */ 156 #define T_PX 26 /* X.400 mail mapping */ 157 #define T_GPOS 27 /* geographical position (withdrawn) */ 158 #define T_AAAA 28 /* IP6 Address */ 159 #define T_LOC 29 /* Location Information */ 160 #define T_NXT 30 /* Next Valid Name in Zone */ 161 #define T_EID 31 /* Endpoint identifier */ 162 #define T_NIMLOC 32 /* Nimrod locator */ 163 #define T_SRV 33 /* Server selection */ 164 #define T_ATMA 34 /* ATM Address */ 165 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 166 #define T_A6 38 /* IP6 address */ 167 #define T_DNAME 39 /* non-terminal redirection */ 168 #define T_OPT 41 /* EDNS0 option (meta-RR) */ 169 /* non standard */ 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_CACHE_FLUSH 0x8000 /* mDNS cache flush flag */ 194 195 /* 196 * Status return codes for T_UNSPEC conversion routines 197 */ 198 #define CONV_SUCCESS 0 199 #define CONV_OVERFLOW -1 200 #define CONV_BADFMT -2 201 #define CONV_BADCKSUM -3 202 #define CONV_BADBUFLEN -4 203 204 /* 205 * Structure for query header. 206 */ 207 typedef struct { 208 u_int16_t id; /* query identification number */ 209 u_int8_t flags1; /* first byte of flags */ 210 u_int8_t flags2; /* second byte of flags */ 211 u_int16_t qdcount; /* number of question entries */ 212 u_int16_t ancount; /* number of answer entries */ 213 u_int16_t nscount; /* number of authority entries */ 214 u_int16_t arcount; /* number of resource entries */ 215 } HEADER; 216 217 /* 218 * Macros for subfields of flag fields. 219 */ 220 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 221 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 222 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 223 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 224 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 225 226 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 227 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 228 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 229 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 230 231 /* 232 * Defines for handling compressed domain names, EDNS0 labels, etc. 233 */ 234 #define INDIR_MASK 0xc0 /* 11.... */ 235 #define EDNS0_MASK 0x40 /* 01.... */ 236 # define EDNS0_ELT_BITLABEL 0x01 237 238 /* 239 * Structure for passing resource records around. 240 */ 241 struct rrec { 242 int16_t r_zone; /* zone number */ 243 int16_t r_class; /* class number */ 244 int16_t r_type; /* type number */ 245 u_int32_t r_ttl; /* time to live */ 246 int r_size; /* size of data area */ 247 char *r_data; /* pointer to data */ 248 }; 249 250 /* 251 * Inline versions of get/put short/long. Pointer is advanced. 252 * We also assume that a "u_int16_t" holds 2 "chars" 253 * and that a "u_int32_t" holds 4 "chars". 254 * 255 * These macros demonstrate the property of C whereby it can be 256 * portable or it can be elegant but never both. 257 */ 258 #define GETSHORT(s, cp) { \ 259 register u_char *t_cp = (u_char *)(cp); \ 260 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ 261 (cp) += 2; \ 262 } 263 264 #define GETLONG(l, cp) { \ 265 register u_char *t_cp = (u_char *)(cp); \ 266 (l) = (((u_int32_t)t_cp[0]) << 24) \ 267 | (((u_int32_t)t_cp[1]) << 16) \ 268 | (((u_int32_t)t_cp[2]) << 8) \ 269 | (((u_int32_t)t_cp[3])); \ 270 (cp) += 4; \ 271 } 272 273 #define PUTSHORT(s, cp) { \ 274 register u_int16_t t_s = (u_int16_t)(s); \ 275 register u_char *t_cp = (u_char *)(cp); \ 276 *t_cp++ = t_s >> 8; \ 277 *t_cp = t_s; \ 278 (cp) += 2; \ 279 } 280 281 /* 282 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 283 * were depending on this "feature", you will lose. 284 */ 285 #define PUTLONG(l, cp) { \ 286 register u_int32_t t_l = (u_int32_t)(l); \ 287 register u_char *t_cp = (u_char *)(cp); \ 288 *t_cp++ = t_l >> 24; \ 289 *t_cp++ = t_l >> 16; \ 290 *t_cp++ = t_l >> 8; \ 291 *t_cp = t_l; \ 292 (cp) += 4; \ 293 } 294 295 #endif /* !_NAMESER_H_ */ 296