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1 office 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_ */