Annotation of embedaddon/dnsmasq/src/dns-protocol.h, revision 1.1.1.1
1.1 misho 1: /* dnsmasq is Copyright (c) 2000-2013 Simon Kelley
2:
3: This program is free software; you can redistribute it and/or modify
4: it under the terms of the GNU General Public License as published by
5: the Free Software Foundation; version 2 dated June, 1991, or
6: (at your option) version 3 dated 29 June, 2007.
7:
8: This program is distributed in the hope that it will be useful,
9: but WITHOUT ANY WARRANTY; without even the implied warranty of
10: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11: GNU General Public License for more details.
12:
13: You should have received a copy of the GNU General Public License
14: along with this program. If not, see <http://www.gnu.org/licenses/>.
15: */
16:
17: #define NAMESERVER_PORT 53
18: #define TFTP_PORT 69
19:
20: #define IN6ADDRSZ 16
21: #define INADDRSZ 4
22:
23: #define PACKETSZ 512 /* maximum packet size */
24: #define MAXDNAME 1025 /* maximum presentation domain name */
25: #define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
26: #define MAXLABEL 63 /* maximum length of domain label */
27:
28: #define NOERROR 0 /* no error */
29: #define FORMERR 1 /* format error */
30: #define SERVFAIL 2 /* server failure */
31: #define NXDOMAIN 3 /* non existent domain */
32: #define NOTIMP 4 /* not implemented */
33: #define REFUSED 5 /* query refused */
34:
35: #define QUERY 0 /* opcode */
36:
37: #define C_IN 1 /* the arpa internet */
38: #define C_CHAOS 3 /* for chaos net (MIT) */
39: #define C_ANY 255 /* wildcard match */
40:
41: #define T_A 1
42: #define T_NS 2
43: #define T_CNAME 5
44: #define T_SOA 6
45: #define T_PTR 12
46: #define T_MX 15
47: #define T_TXT 16
48: #define T_SIG 24
49: #define T_AAAA 28
50: #define T_SRV 33
51: #define T_NAPTR 35
52: #define T_OPT 41
53: #define T_TKEY 249
54: #define T_TSIG 250
55: #define T_AXFR 252
56: #define T_MAILB 253
57: #define T_ANY 255
58:
59: struct dns_header {
60: u16 id;
61: u8 hb3,hb4;
62: u16 qdcount,ancount,nscount,arcount;
63: };
64:
65: #define HB3_QR 0x80
66: #define HB3_OPCODE 0x78
67: #define HB3_AA 0x04
68: #define HB3_TC 0x02
69: #define HB3_RD 0x01
70:
71: #define HB4_RA 0x80
72: #define HB4_AD 0x20
73: #define HB4_CD 0x10
74: #define HB4_RCODE 0x0f
75:
76: #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
77: #define RCODE(x) ((x)->hb4 & HB4_RCODE)
78: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
79:
80: #define GETSHORT(s, cp) { \
81: unsigned char *t_cp = (unsigned char *)(cp); \
82: (s) = ((u16)t_cp[0] << 8) \
83: | ((u16)t_cp[1]) \
84: ; \
85: (cp) += 2; \
86: }
87:
88: #define GETLONG(l, cp) { \
89: unsigned char *t_cp = (unsigned char *)(cp); \
90: (l) = ((u32)t_cp[0] << 24) \
91: | ((u32)t_cp[1] << 16) \
92: | ((u32)t_cp[2] << 8) \
93: | ((u32)t_cp[3]) \
94: ; \
95: (cp) += 4; \
96: }
97:
98: #define PUTSHORT(s, cp) { \
99: u16 t_s = (u16)(s); \
100: unsigned char *t_cp = (unsigned char *)(cp); \
101: *t_cp++ = t_s >> 8; \
102: *t_cp = t_s; \
103: (cp) += 2; \
104: }
105:
106: #define PUTLONG(l, cp) { \
107: u32 t_l = (u32)(l); \
108: unsigned char *t_cp = (unsigned char *)(cp); \
109: *t_cp++ = t_l >> 24; \
110: *t_cp++ = t_l >> 16; \
111: *t_cp++ = t_l >> 8; \
112: *t_cp = t_l; \
113: (cp) += 4; \
114: }
115:
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