The Tcpdump Group git mirrors - tcpdump/blob

1 /*

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 * -

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 * Currently defined opcodes

75 */

76 #define QUERY 0x0 /* standard query */

77 #define IQUERY 0x1 /* inverse query */

78 #define STATUS 0x2 /* nameserver status query */

79 #if 0

80 #define xxx 0x3 /* 0x3 reserved */

81 #endif

82 /* non standard - supports ALLOW_UPDATES stuff from Mike Schwartz */

83 #define UPDATEA 0x9 /* add resource record */

84 #define UPDATED 0xa /* delete a specific resource record */

85 #define UPDATEDA 0xb /* delete all named resource record */

86 #define UPDATEM 0xc /* modify a specific resource record */

87 #define UPDATEMA 0xd /* modify all named resource record */

88

89 #define ZONEINIT 0xe /* initial zone transfer */

90 #define ZONEREF 0xf /* incremental zone referesh */

91

92 /*

93 * Undefine various #defines from various System V-flavored OSes (Solaris,

94 * SINIX, HP-UX) so the compiler doesn't whine that we redefine them.

95 */

96 #ifdef T_NULL

97 #undef T_NULL

98 #endif

99 #ifdef T_OPT

100 #undef T_OPT

101 #endif

102 #ifdef T_UNSPEC

103 #undef T_UNSPEC

104 #endif

105 #ifdef NOERROR

106 #undef NOERROR

107 #endif

108

109 /*

110 * Currently defined response codes

111 */

112 #define NOERROR 0 /* no error */

113 #define FORMERR 1 /* format error */

114 #define SERVFAIL 2 /* server failure */

115 #define NXDOMAIN 3 /* non existent domain */

116 #define NOTIMP 4 /* not implemented */

117 #define REFUSED 5 /* query refused */

118 /* non standard */

119 #define NOCHANGE 0xf /* update failed to change db */

120

121 /*

122 * Type values for resources and queries

123 */

124 #define T_A 1 /* host address */

125 #define T_NS 2 /* authoritative server */

126 #define T_MD 3 /* mail destination */

127 #define T_MF 4 /* mail forwarder */

128 #define T_CNAME 5 /* connonical name */

129 #define T_SOA 6 /* start of authority zone */

130 #define T_MB 7 /* mailbox domain name */

131 #define T_MG 8 /* mail group member */

132 #define T_MR 9 /* mail rename name */

133 #define T_NULL 10 /* null resource record */

134 #define T_WKS 11 /* well known service */

135 #define T_PTR 12 /* domain name pointer */

136 #define T_HINFO 13 /* host information */

137 #define T_MINFO 14 /* mailbox information */

138 #define T_MX 15 /* mail routing information */

139 #define T_TXT 16 /* text strings */

140 #define T_RP 17 /* responsible person */

141 #define T_AFSDB 18 /* AFS cell database */

142 #define T_X25 19 /* X_25 calling address */

143 #define T_ISDN 20 /* ISDN calling address */

144 #define T_RT 21 /* router */

145 #define T_NSAP 22 /* NSAP address */

146 #define T_NSAP_PTR 23 /* reverse lookup for NSAP */

147 #define T_SIG 24 /* security signature */

148 #define T_KEY 25 /* security key */

149 #define T_PX 26 /* X.400 mail mapping */

150 #define T_GPOS 27 /* geographical position (withdrawn) */

151 #define T_AAAA 28 /* IP6 Address */

152 #define T_LOC 29 /* Location Information */

153 #define T_NXT 30 /* Next Valid Name in Zone */

154 #define T_EID 31 /* Endpoint identifier */

155 #define T_NIMLOC 32 /* Nimrod locator */

156 #define T_SRV 33 /* Server selection */

157 #define T_ATMA 34 /* ATM Address */

158 #define T_NAPTR 35 /* Naming Authority PoinTeR */

159 #define T_KX 36 /* Key Exchanger */

160 #define T_CERT 37 /* Certificates in the DNS */

161 #define T_A6 38 /* IP6 address */

162 #define T_DNAME 39 /* non-terminal redirection */

163 #define T_SINK 40 /* unknown */

164 #define T_OPT 41 /* EDNS0 option (meta-RR) */

165 #define T_APL 42 /* lists of address prefixes */

166 #define T_DS 43 /* Delegation Signer */

167 #define T_SSHFP 44 /* SSH Fingerprint */

168 #define T_IPSECKEY 45 /* IPsec keying material */

169 #define T_RRSIG 46 /* new security signature */

170 #define T_NSEC 47 /* provable insecure information */

171 #define T_DNSKEY 48 /* new security key */

172 /* non standard */

173 #define T_SPF 99 /* sender policy framework */

174 #define T_UINFO 100 /* user (finger) information */

175 #define T_UID 101 /* user ID */

176 #define T_GID 102 /* group ID */

177 #define T_UNSPEC 103 /* Unspecified format (binary data) */

178 #define T_UNSPECA 104 /* "unspecified ASCII". Ugly MIT hack */

179 /* Query type values which do not appear in resource records */

180 #define T_TKEY 249 /* Transaction Key [RFC2930] */

181 #define T_TSIG 250 /* Transaction Signature [RFC2845] */

182 #define T_IXFR 251 /* incremental transfer [RFC1995] */

183 #define T_AXFR 252 /* transfer zone of authority */

184 #define T_MAILB 253 /* transfer mailbox records */

185 #define T_MAILA 254 /* transfer mail agent records */

186 #define T_ANY 255 /* wildcard match */

187

188 /*

189 * Values for class field

190 */

191

192 #define C_IN 1 /* the arpa internet */

193 #define C_CHAOS 3 /* for chaos net (MIT) */

194 #define C_HS 4 /* for Hesiod name server (MIT) (XXX) */

195 /* Query class values which do not appear in resource records */

196 #define C_ANY 255 /* wildcard match */

197 #define C_QU 0x8000 /* mDNS QU flag in queries */

198 #define C_CACHE_FLUSH 0x8000 /* mDNS cache flush flag in replies */

199

200 /*

201 * Status return codes for T_UNSPEC conversion routines

202 */

203 #define CONV_SUCCESS 0

204 #define CONV_OVERFLOW -1

205 #define CONV_BADFMT -2

206 #define CONV_BADCKSUM -3

207 #define CONV_BADBUFLEN -4

208

209 /*

210 * Structure for query header.

211 */

212 typedef struct {

213 nd_uint16_t id; /* query identification number */

214 nd_uint16_t flags; /* QR, Opcode, AA, TC, RD, RA, RCODE */

215 nd_uint16_t qdcount; /* number of question entries */

216 nd_uint16_t ancount; /* number of answer entries */

217 nd_uint16_t nscount; /* number of authority entries */

218 nd_uint16_t arcount; /* number of resource entries */

219 } dns_header_t;

220

221 /*

222 * Macros for subfields of flag fields.

223 */

224 #define DNS_QR(flags) ((flags) & 0x8000) /* response flag */

225 #define DNS_OPCODE(flags) (((flags) >> 11) & 0xF) /* purpose of message */

226 #define DNS_AA(flags) (flags & 0x0400) /* authoritative answer */

227 #define DNS_TC(flags) (flags & 0x0200) /* truncated message */

228 #define DNS_RD(flags) (flags & 0x0100) /* recursion desired */

229 #define DNS_RA(flags) (flags & 0x0080) /* recursion available */

230 #define DNS_AD(flags) (flags & 0x0020) /* authentic data from named */

231 #define DNS_CD(flags) (flags & 0x0010) /* checking disabled by resolver */

232 #define DNS_RCODE(flags) (flags & 0x000F) /* response code */

233

234 /*

235 * Defines for handling compressed domain names, EDNS0 labels, etc.

236 */

237 #define INDIR_MASK 0xc0 /* 11.... */

238 #define EDNS0_MASK 0x40 /* 01.... */

239 # define EDNS0_ELT_BITLABEL 0x01

240

241 #endif /* !_NAMESER_H_ */