1: /* dnsmasq is Copyright (c) 2000-2014 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_HESIOD 4 /* hesiod */
40: #define C_ANY 255 /* wildcard match */
41:
42: #define T_A 1
43: #define T_NS 2
44: #define T_MD 3
45: #define T_MF 4
46: #define T_CNAME 5
47: #define T_SOA 6
48: #define T_MB 7
49: #define T_MG 8
50: #define T_MR 9
51: #define T_PTR 12
52: #define T_MINFO 14
53: #define T_MX 15
54: #define T_TXT 16
55: #define T_RP 17
56: #define T_AFSDB 18
57: #define T_RT 21
58: #define T_SIG 24
59: #define T_PX 26
60: #define T_AAAA 28
61: #define T_NXT 30
62: #define T_SRV 33
63: #define T_NAPTR 35
64: #define T_KX 36
65: #define T_DNAME 39
66: #define T_OPT 41
67: #define T_DS 43
68: #define T_RRSIG 46
69: #define T_NSEC 47
70: #define T_DNSKEY 48
71: #define T_NSEC3 50
72: #define T_TKEY 249
73: #define T_TSIG 250
74: #define T_AXFR 252
75: #define T_MAILB 253
76: #define T_ANY 255
77:
78: #define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */
79: #define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */
80:
81: struct dns_header {
82: u16 id;
83: u8 hb3,hb4;
84: u16 qdcount,ancount,nscount,arcount;
85: };
86:
87: #define HB3_QR 0x80
88: #define HB3_OPCODE 0x78
89: #define HB3_AA 0x04
90: #define HB3_TC 0x02
91: #define HB3_RD 0x01
92:
93: #define HB4_RA 0x80
94: #define HB4_AD 0x20
95: #define HB4_CD 0x10
96: #define HB4_RCODE 0x0f
97:
98: #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
99: #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
100:
101: #define RCODE(x) ((x)->hb4 & HB4_RCODE)
102: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
103:
104: #define GETSHORT(s, cp) { \
105: unsigned char *t_cp = (unsigned char *)(cp); \
106: (s) = ((u16)t_cp[0] << 8) \
107: | ((u16)t_cp[1]) \
108: ; \
109: (cp) += 2; \
110: }
111:
112: #define GETLONG(l, cp) { \
113: unsigned char *t_cp = (unsigned char *)(cp); \
114: (l) = ((u32)t_cp[0] << 24) \
115: | ((u32)t_cp[1] << 16) \
116: | ((u32)t_cp[2] << 8) \
117: | ((u32)t_cp[3]) \
118: ; \
119: (cp) += 4; \
120: }
121:
122: #define PUTSHORT(s, cp) { \
123: u16 t_s = (u16)(s); \
124: unsigned char *t_cp = (unsigned char *)(cp); \
125: *t_cp++ = t_s >> 8; \
126: *t_cp = t_s; \
127: (cp) += 2; \
128: }
129:
130: #define PUTLONG(l, cp) { \
131: u32 t_l = (u32)(l); \
132: unsigned char *t_cp = (unsigned char *)(cp); \
133: *t_cp++ = t_l >> 24; \
134: *t_cp++ = t_l >> 16; \
135: *t_cp++ = t_l >> 8; \
136: *t_cp = t_l; \
137: (cp) += 4; \
138: }
139:
140: #define CHECK_LEN(header, pp, plen, len) \
141: ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
142:
143: #define ADD_RDLEN(header, pp, plen, len) \
144: (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
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