1 /* @(#) $Header: /tcpdump/master/tcpdump/nameser.h,v 1.5 2000/12/28 20:30:41 itojun Exp $ (LBL) */
3 * Copyright (c) 1983, 1989, 1993
4 * The Regents of the University of California. All rights reserved.
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7 * modification, are permitted provided that the following conditions
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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.
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20 * without specific prior written permission.
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31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * @(#)nameser.h 8.2 (Berkeley) 2/16/94
36 * Portions Copyright (c) 1993 by Digital Equipment Corporation.
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
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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.
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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
60 #include <sys/types.h>
63 * Define constants based on rfc883
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 */
71 /* number of bytes of fixed size data in resource record */
75 * Internet nameserver port number
77 #define NAMESERVER_PORT 53
80 * Currently defined opcodes
82 #define QUERY 0x0 /* standard query */
83 #define IQUERY 0x1 /* inverse query */
84 #define STATUS 0x2 /* nameserver status query */
86 #define xxx 0x3 /* 0x3 reserved */
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 */
95 #define ZONEINIT 0xe /* initial zone transfer */
96 #define ZONEREF 0xf /* incremental zone referesh */
99 * Currently defined response codes
101 #define NOERROR 0 /* no error */
102 #define FORMERR 1 /* format error */
103 #define SERVFAIL 2 /* server failure */
104 #define NXDOMAIN 3 /* non existent domain */
105 #define NOTIMP 4 /* not implemented */
106 #define REFUSED 5 /* query refused */
108 #define NOCHANGE 0xf /* update failed to change db */
111 * Type values for resources and queries
113 #define T_A 1 /* host address */
114 #define T_NS 2 /* authoritative server */
115 #define T_MD 3 /* mail destination */
116 #define T_MF 4 /* mail forwarder */
117 #define T_CNAME 5 /* connonical name */
118 #define T_SOA 6 /* start of authority zone */
119 #define T_MB 7 /* mailbox domain name */
120 #define T_MG 8 /* mail group member */
121 #define T_MR 9 /* mail rename name */
122 #define T_NULL 10 /* null resource record */
123 #define T_WKS 11 /* well known service */
124 #define T_PTR 12 /* domain name pointer */
125 #define T_HINFO 13 /* host information */
126 #define T_MINFO 14 /* mailbox information */
127 #define T_MX 15 /* mail routing information */
128 #define T_TXT 16 /* text strings */
129 #define T_RP 17 /* responsible person */
130 #define T_AFSDB 18 /* AFS cell database */
131 #define T_NSAP 22 /* NSAP address */
132 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */
134 #define T_UINFO 100 /* user (finger) information */
135 #define T_UID 101 /* user ID */
136 #define T_GID 102 /* group ID */
137 #define T_UNSPEC 103 /* Unspecified format (binary data) */
138 /* Query type values which do not appear in resource records */
139 #define T_AXFR 252 /* transfer zone of authority */
140 #define T_MAILB 253 /* transfer mailbox records */
141 #define T_MAILA 254 /* transfer mail agent records */
142 #define T_ANY 255 /* wildcard match */
145 * Values for class field
148 #define C_IN 1 /* the arpa internet */
149 #define C_CHAOS 3 /* for chaos net (MIT) */
150 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */
151 /* Query class values which do not appear in resource records */
152 #define C_ANY 255 /* wildcard match */
155 * Status return codes for T_UNSPEC conversion routines
157 #define CONV_SUCCESS 0
158 #define CONV_OVERFLOW -1
159 #define CONV_BADFMT -2
160 #define CONV_BADCKSUM -3
161 #define CONV_BADBUFLEN -4
164 * Structure for query header.
167 u_int16_t id; /* query identification number */
168 u_int8_t flags1; /* first byte of flags */
169 u_int8_t flags2; /* second byte of flags */
170 u_int16_t qdcount; /* number of question entries */
171 u_int16_t ancount; /* number of answer entries */
172 u_int16_t nscount; /* number of authority entries */
173 u_int16_t arcount; /* number of resource entries */
177 * Macros for subfields of flag fields.
179 #define DNS_QR(np) ((np)->flags1 & 0x80) /* response flag */
180 #define DNS_OPCODE(np) ((((np)->flags1) >> 3) & 0xF) /* purpose of message */
181 #define DNS_AA(np) ((np)->flags1 & 0x04) /* authoritative answer */
182 #define DNS_TC(np) ((np)->flags1 & 0x02) /* truncated message */
183 #define DNS_RD(np) ((np)->flags1 & 0x01) /* recursion desired */
185 #define DNS_RA(np) ((np)->flags2 & 0x80) /* recursion available */
186 #define DNS_AD(np) ((np)->flags2 & 0x20) /* authentic data from named */
187 #define DNS_CD(np) ((np)->flags2 & 0x10) /* checking disabled by resolver */
188 #define DNS_RCODE(np) ((np)->flags2 & 0xF) /* response code */
191 * Defines for handling compressed domain names, EDNS0 labels, etc.
193 #define INDIR_MASK 0xc0 /* 11.... */
194 #define EDNS0_MASK 0x40 /* 01.... */
195 # define EDNS0_ELT_BITLABEL 0x01
198 * Structure for passing resource records around.
201 int16_t r_zone; /* zone number */
202 int16_t r_class; /* class number */
203 int16_t r_type; /* type number */
204 u_int32_t r_ttl; /* time to live */
205 int r_size; /* size of data area */
206 char *r_data; /* pointer to data */
210 * Inline versions of get/put short/long. Pointer is advanced.
211 * We also assume that a "u_int16_t" holds 2 "chars"
212 * and that a "u_int32_t" holds 4 "chars".
214 * These macros demonstrate the property of C whereby it can be
215 * portable or it can be elegant but never both.
217 #define GETSHORT(s, cp) { \
218 register u_char *t_cp = (u_char *)(cp); \
219 (s) = ((u_int16_t)t_cp[0] << 8) | (u_int16_t)t_cp[1]; \
223 #define GETLONG(l, cp) { \
224 register u_char *t_cp = (u_char *)(cp); \
225 (l) = (((u_int32_t)t_cp[0]) << 24) \
226 | (((u_int32_t)t_cp[1]) << 16) \
227 | (((u_int32_t)t_cp[2]) << 8) \
228 | (((u_int32_t)t_cp[3])); \
232 #define PUTSHORT(s, cp) { \
233 register u_int16_t t_s = (u_int16_t)(s); \
234 register u_char *t_cp = (u_char *)(cp); \
235 *t_cp++ = t_s >> 8; \
241 * Warning: PUTLONG --no-longer-- destroys its first argument. if you
242 * were depending on this "feature", you will lose.
244 #define PUTLONG(l, cp) { \
245 register u_int32_t t_l = (u_int32_t)(l); \
246 register u_char *t_cp = (u_char *)(cp); \
247 *t_cp++ = t_l >> 24; \
248 *t_cp++ = t_l >> 16; \
249 *t_cp++ = t_l >> 8; \
254 #endif /* !_NAMESER_H_ */