1 /* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.9 2001/06/27 05:40:16 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 79 /* 80 * Currently defined opcodes 81 */ 82 #define QUERY 0x0 /* standard query */ 83 #define IQUERY 0x1 /* inverse query */ 84 #define STATUS 0x2 /* nameserver status query */ 85 #if 0 86 #define xxx 0x3 /* 0x3 reserved */ 87 #endif 88 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */ 89 #define UPDATEA 0x9 /* add resource record */ 90 #define UPDATED 0xa /* delete a specific resource record */ 91 #define UPDATEDA 0xb /* delete all named resource record */ 92 #define UPDATEM 0xc /* modify a specific resource record */ 93 #define UPDATEMA 0xd /* modify all named resource record */ 94 95 #define ZONEINIT 0xe /* initial zone transfer */ 96 #define ZONEREF 0xf /* incremental zone referesh */ 97 98 /* 99 * Undefine various #defines from various System V-flavored OSes (Solaris, 100 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them. 101 */ 102 #ifdef T_NULL 103 #undef T_NULL 104 #endif 105 #ifdef T_OPT 106 #undef T_OPT 107 #endif 108 #ifdef T_UNSPEC 109 #undef T_UNSPEC 110 #endif 111 #ifdef NOERROR 112 #undef NOERROR 113 #endif 114 115 /* 116 * Currently defined response codes 117 */ 118 #define NOERROR 0 /* no error */ 119 #define FORMERR 1 /* format error */ 120 #define SERVFAIL 2 /* server failure */ 121 #define NXDOMAIN 3 /* non existent domain */ 122 #define NOTIMP 4 /* not implemented */ 123 #define REFUSED 5 /* query refused */ 124 /* non standard */ 125 #define NOCHANGE 0xf /* update failed to change db */ 126 127 /* 128 * Type values for resources and queries 129 */ 130 #define T_A 1 /* host address */ 131 #define T_NS 2 /* authoritative server */ 132 #define T_MD 3 /* mail destination */ 133 #define T_MF 4 /* mail forwarder */ 134 #define T_CNAME 5 /* connonical name */ 135 #define T_SOA 6 /* start of authority zone */ 136 #define T_MB 7 /* mailbox domain name */ 137 #define T_MG 8 /* mail group member */ 138 #define T_MR 9 /* mail rename name */ 139 #define T_NULL 10 /* null resource record */ 140 #define T_WKS 11 /* well known service */ 141 #define T_PTR 12 /* domain name pointer */ 142 #define T_HINFO 13 /* host information */ 143 #define T_MINFO 14 /* mailbox information */ 144 #define T_MX 15 /* mail routing information */ 145 #define T_TXT 16 /* text strings */ 146 #define T_RP 17 /* responsible person */ 147 #define T_AFSDB 18 /* AFS cell database */ 148 #define T_X25 19 /* X_25 calling address */ 149 #define T_ISDN 20 /* ISDN calling address */ 150 #define T_RT 21 /* router */ 151 #define T_NSAP 22 /* NSAP address */ 152 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */ 153 #define T_SIG 24 /* security signature */ 154 #define T_KEY 25 /* security key */ 155 #define T_PX 26 /* X.400 mail mapping */ 156 #define T_GPOS 27 /* geographical position (withdrawn) */ 157 #define T_AAAA 28 /* IP6 Address */ 158 #define T_LOC 29 /* Location Information */ 159 #define T_NXT 30 /* Next Valid Name in Zone */ 160 #define T_EID 31 /* Endpoint identifier */ 161 #define T_NIMLOC 32 /* Nimrod locator */ 162 #define T_SRV 33 /* Server selection */ 163 #define T_ATMA 34 /* ATM Address */ 164 #define T_NAPTR 35 /* Naming Authority PoinTeR */ 165 #define T_A6 38 /* IP6 address */ 166 #define T_DNAME 39 /* non-terminal redirection */ 167 #define T_OPT 41 /* EDNS0 option (meta-RR) */ 168 /* non standard */ 169 #define T_UINFO 100 /* user (finger) information */ 170 #define T_UID 101 /* user ID */ 171 #define T_GID 102 /* group ID */ 172 #define T_UNSPEC 103 /* Unspecified format (binary data) */ 173 #define T_UNSPECA 104 /* "unspecified ascii". Ugly MIT hack */ 174 /* Query type values which do not appear in resource records */ 175 #define T_TKEY 249 /* Transaction Key [RFC2930] */ 176 #define T_TSIG 250 /* Transaction Signature [RFC2845] */ 177 #define T_IXFR 251 /* incremental transfer [RFC1995] */ 178 #define T_AXFR 252 /* transfer zone of authority */ 179 #define T_MAILB 253 /* transfer mailbox records */ 180 #define T_MAILA 254 /* transfer mail agent records */ 181 #define T_ANY 255 /* wildcard match */ 182 183 /* 184 * Values for class field 185 */ 186 187 #define C_IN 1 /* the arpa internet */ 188 #define C_CHAOS 3 /* for chaos net (MIT) */ 189 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */ 190 /* Query class values which do not appear in resource records */ 191 #define C_ANY 255 /* wildcard match */ 192 193 /* 194 * Status return codes for T_UNSPEC conversion routines 195 */ 196 #define CONV_SUCCESS 0 197 #define CONV_OVERFLOW -1 198 #define CONV_BADFMT -2 199 #define CONV_BADCKSUM -3 200 #define CONV_BADBUFLEN -4 201 202 /* 203 * Structure for query header. 204 */ 205 typedef struct { 206 u_int16_t id; /* query identification number */ 207 u_int8_t flags1; /* first byte of flags */ 208 u_int8_t flags2; /* second byte of flags */ 209 u_int16_t qdcount; /* number of question entries */ 210 u_int16_t ancount; /* number of answer entries */ 211 u_int16_t nscount; /* number of authority entries */ 212 u_int16_t arcount; /* number of resource entries */ 213 } HEADER; 214 215 /* 216 * Macros for subfields of flag fields. 217 */ 218 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */ 219 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */ 220 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */ 221 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */ 222 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */ 223 224 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */ 225 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */ 226 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */ 227 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */ 228 229 /* 230 * Defines for handling compressed domain names, EDNS0 labels, etc. 231 */ 232 #define INDIR_MASK 0xc0 /* 11.... */ 233 #define EDNS0_MASK 0x40 /* 01.... */ 234 # define EDNS0_ELT_BITLABEL 0x01 235 236 /* 237 * Structure for passing resource records around. 238 */ 239 struct rrec { 240 int16_t r_zone; /* zone number */ 241 int16_t r_class; /* class number */ 242 int16_t r_type; /* type number */ 243 u_int32_t r_ttl; /* time to live */ 244 int r_size; /* size of data area */ 245 char *r_data; /* pointer to data */ 246 }; 247 248 /* 249 * Inline versions of get/put short/long. Pointer is advanced. 250 * We also assume that a "u_int16_t" holds 2 "chars" 251 * and that a "u_int32_t" holds 4 "chars". 252 * 253 * These macros demonstrate the property of C whereby it can be 254 * portable or it can be elegant but never both. 255 */ 256 #define GETSHORT(s, cp) { \ 257 register u_char *t_cp = (u_char *)(cp); \ 258 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \ 259 (cp) += 2; \ 260 } 261 262 #define GETLONG(l, cp) { \ 263 register u_char *t_cp = (u_char *)(cp); \ 264 (l) = (((u_int32_t)t_cp[0]) << 24) \ 265 | (((u_int32_t)t_cp[1]) << 16) \ 266 | (((u_int32_t)t_cp[2]) << 8) \ 267 | (((u_int32_t)t_cp[3])); \ 268 (cp) += 4; \ 269 } 270 271 #define PUTSHORT(s, cp) { \ 272 register u_int16_t t_s = (u_int16_t)(s); \ 273 register u_char *t_cp = (u_char *)(cp); \ 274 *t_cp++ = t_s >> 8; \ 275 *t_cp = t_s; \ 276 (cp) += 2; \ 277 } 278 279 /* 280 * Warning: PUTLONG --no-longer-- destroys its first argument. if you 281 * were depending on this "feature", you will lose. 282 */ 283 #define PUTLONG(l, cp) { \ 284 register u_int32_t t_l = (u_int32_t)(l); \ 285 register u_char *t_cp = (u_char *)(cp); \ 286 *t_cp++ = t_l >> 24; \ 287 *t_cp++ = t_l >> 16; \ 288 *t_cp++ = t_l >> 8; \ 289 *t_cp = t_l; \ 290 (cp) += 4; \ 291 } 292 293 #endif /* !_NAMESER_H_ */ 294