Annotation of embedaddon/dnsmasq/src/dns-protocol.h, revision 1.1.1.4
1.1.1.4 ! misho 1: /* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
1.1 misho 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
1.1.1.4 ! misho 19: #define MIN_PORT 1024 /* first non-reserved port */
1.1.1.3 misho 20: #define MAX_PORT 65535u
1.1 misho 21:
22: #define IN6ADDRSZ 16
23: #define INADDRSZ 4
24:
25: #define PACKETSZ 512 /* maximum packet size */
26: #define MAXDNAME 1025 /* maximum presentation domain name */
27: #define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
28: #define MAXLABEL 63 /* maximum length of domain label */
29:
30: #define NOERROR 0 /* no error */
31: #define FORMERR 1 /* format error */
32: #define SERVFAIL 2 /* server failure */
33: #define NXDOMAIN 3 /* non existent domain */
34: #define NOTIMP 4 /* not implemented */
35: #define REFUSED 5 /* query refused */
36:
37: #define QUERY 0 /* opcode */
38:
39: #define C_IN 1 /* the arpa internet */
40: #define C_CHAOS 3 /* for chaos net (MIT) */
1.1.1.2 misho 41: #define C_HESIOD 4 /* hesiod */
1.1 misho 42: #define C_ANY 255 /* wildcard match */
43:
44: #define T_A 1
1.1.1.2 misho 45: #define T_NS 2
46: #define T_MD 3
47: #define T_MF 4
1.1 misho 48: #define T_CNAME 5
49: #define T_SOA 6
1.1.1.2 misho 50: #define T_MB 7
51: #define T_MG 8
52: #define T_MR 9
1.1 misho 53: #define T_PTR 12
1.1.1.2 misho 54: #define T_MINFO 14
1.1 misho 55: #define T_MX 15
56: #define T_TXT 16
1.1.1.2 misho 57: #define T_RP 17
58: #define T_AFSDB 18
59: #define T_RT 21
1.1 misho 60: #define T_SIG 24
1.1.1.2 misho 61: #define T_PX 26
1.1 misho 62: #define T_AAAA 28
1.1.1.2 misho 63: #define T_NXT 30
1.1 misho 64: #define T_SRV 33
65: #define T_NAPTR 35
1.1.1.2 misho 66: #define T_KX 36
67: #define T_DNAME 39
1.1 misho 68: #define T_OPT 41
1.1.1.2 misho 69: #define T_DS 43
70: #define T_RRSIG 46
71: #define T_NSEC 47
72: #define T_DNSKEY 48
73: #define T_NSEC3 50
1.1 misho 74: #define T_TKEY 249
75: #define T_TSIG 250
76: #define T_AXFR 252
77: #define T_MAILB 253
78: #define T_ANY 255
1.1.1.4 ! misho 79: #define T_CAA 257
1.1 misho 80:
1.1.1.2 misho 81: #define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */
82: #define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */
1.1.1.3 misho 83: #define EDNS0_OPTION_NOMDEVICEID 65073 /* Nominum temporary assignment */
84: #define EDNS0_OPTION_NOMCPEID 65074 /* Nominum temporary assignment */
1.1.1.2 misho 85:
1.1 misho 86: struct dns_header {
87: u16 id;
88: u8 hb3,hb4;
89: u16 qdcount,ancount,nscount,arcount;
90: };
91:
1.1.1.3 misho 92: #define HB3_QR 0x80 /* Query */
1.1 misho 93: #define HB3_OPCODE 0x78
1.1.1.3 misho 94: #define HB3_AA 0x04 /* Authoritative Answer */
95: #define HB3_TC 0x02 /* TrunCated */
96: #define HB3_RD 0x01 /* Recursion Desired */
97:
98: #define HB4_RA 0x80 /* Recursion Available */
99: #define HB4_AD 0x20 /* Authenticated Data */
100: #define HB4_CD 0x10 /* Checking Disabled */
1.1 misho 101: #define HB4_RCODE 0x0f
102:
103: #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
1.1.1.2 misho 104: #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
105:
1.1 misho 106: #define RCODE(x) ((x)->hb4 & HB4_RCODE)
107: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
108:
109: #define GETSHORT(s, cp) { \
110: unsigned char *t_cp = (unsigned char *)(cp); \
111: (s) = ((u16)t_cp[0] << 8) \
112: | ((u16)t_cp[1]) \
113: ; \
114: (cp) += 2; \
115: }
116:
117: #define GETLONG(l, cp) { \
118: unsigned char *t_cp = (unsigned char *)(cp); \
119: (l) = ((u32)t_cp[0] << 24) \
120: | ((u32)t_cp[1] << 16) \
121: | ((u32)t_cp[2] << 8) \
122: | ((u32)t_cp[3]) \
123: ; \
124: (cp) += 4; \
125: }
126:
127: #define PUTSHORT(s, cp) { \
128: u16 t_s = (u16)(s); \
129: unsigned char *t_cp = (unsigned char *)(cp); \
130: *t_cp++ = t_s >> 8; \
131: *t_cp = t_s; \
132: (cp) += 2; \
133: }
134:
135: #define PUTLONG(l, cp) { \
136: u32 t_l = (u32)(l); \
137: unsigned char *t_cp = (unsigned char *)(cp); \
138: *t_cp++ = t_l >> 24; \
139: *t_cp++ = t_l >> 16; \
140: *t_cp++ = t_l >> 8; \
141: *t_cp = t_l; \
142: (cp) += 4; \
143: }
144:
1.1.1.2 misho 145: #define CHECK_LEN(header, pp, plen, len) \
146: ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
147:
148: #define ADD_RDLEN(header, pp, plen, len) \
149: (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
1.1.1.3 misho 150:
151: /* Escape character in our presentation format for names.
152: Cannot be '.' or /000 and must be !isprint().
153: Note that escaped chars are stored as
154: <NAME_ESCAPE> <orig-char+1>
155: to ensure that the escaped form of /000 doesn't include /000
156: */
157: #define NAME_ESCAPE 1
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