Annotation of embedaddon/dnsmasq/src/dns-protocol.h, revision 1.1.1.3
1.1.1.3 ! misho 1: /* dnsmasq is Copyright (c) 2000-2016 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
1.1.1.3 ! misho 19: #define MAX_PORT 65535u
1.1 misho 20:
21: #define IN6ADDRSZ 16
22: #define INADDRSZ 4
23:
24: #define PACKETSZ 512 /* maximum packet size */
25: #define MAXDNAME 1025 /* maximum presentation domain name */
26: #define RRFIXEDSZ 10 /* #/bytes of fixed data in r record */
27: #define MAXLABEL 63 /* maximum length of domain label */
28:
29: #define NOERROR 0 /* no error */
30: #define FORMERR 1 /* format error */
31: #define SERVFAIL 2 /* server failure */
32: #define NXDOMAIN 3 /* non existent domain */
33: #define NOTIMP 4 /* not implemented */
34: #define REFUSED 5 /* query refused */
35:
36: #define QUERY 0 /* opcode */
37:
38: #define C_IN 1 /* the arpa internet */
39: #define C_CHAOS 3 /* for chaos net (MIT) */
1.1.1.2 misho 40: #define C_HESIOD 4 /* hesiod */
1.1 misho 41: #define C_ANY 255 /* wildcard match */
42:
43: #define T_A 1
1.1.1.2 misho 44: #define T_NS 2
45: #define T_MD 3
46: #define T_MF 4
1.1 misho 47: #define T_CNAME 5
48: #define T_SOA 6
1.1.1.2 misho 49: #define T_MB 7
50: #define T_MG 8
51: #define T_MR 9
1.1 misho 52: #define T_PTR 12
1.1.1.2 misho 53: #define T_MINFO 14
1.1 misho 54: #define T_MX 15
55: #define T_TXT 16
1.1.1.2 misho 56: #define T_RP 17
57: #define T_AFSDB 18
58: #define T_RT 21
1.1 misho 59: #define T_SIG 24
1.1.1.2 misho 60: #define T_PX 26
1.1 misho 61: #define T_AAAA 28
1.1.1.2 misho 62: #define T_NXT 30
1.1 misho 63: #define T_SRV 33
64: #define T_NAPTR 35
1.1.1.2 misho 65: #define T_KX 36
66: #define T_DNAME 39
1.1 misho 67: #define T_OPT 41
1.1.1.2 misho 68: #define T_DS 43
69: #define T_RRSIG 46
70: #define T_NSEC 47
71: #define T_DNSKEY 48
72: #define T_NSEC3 50
1.1 misho 73: #define T_TKEY 249
74: #define T_TSIG 250
75: #define T_AXFR 252
76: #define T_MAILB 253
77: #define T_ANY 255
78:
1.1.1.2 misho 79: #define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */
80: #define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */
1.1.1.3 ! misho 81: #define EDNS0_OPTION_NOMDEVICEID 65073 /* Nominum temporary assignment */
! 82: #define EDNS0_OPTION_NOMCPEID 65074 /* Nominum temporary assignment */
1.1.1.2 misho 83:
1.1 misho 84: struct dns_header {
85: u16 id;
86: u8 hb3,hb4;
87: u16 qdcount,ancount,nscount,arcount;
88: };
89:
1.1.1.3 ! misho 90: #define HB3_QR 0x80 /* Query */
1.1 misho 91: #define HB3_OPCODE 0x78
1.1.1.3 ! misho 92: #define HB3_AA 0x04 /* Authoritative Answer */
! 93: #define HB3_TC 0x02 /* TrunCated */
! 94: #define HB3_RD 0x01 /* Recursion Desired */
! 95:
! 96: #define HB4_RA 0x80 /* Recursion Available */
! 97: #define HB4_AD 0x20 /* Authenticated Data */
! 98: #define HB4_CD 0x10 /* Checking Disabled */
1.1 misho 99: #define HB4_RCODE 0x0f
100:
101: #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
1.1.1.2 misho 102: #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
103:
1.1 misho 104: #define RCODE(x) ((x)->hb4 & HB4_RCODE)
105: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
106:
107: #define GETSHORT(s, cp) { \
108: unsigned char *t_cp = (unsigned char *)(cp); \
109: (s) = ((u16)t_cp[0] << 8) \
110: | ((u16)t_cp[1]) \
111: ; \
112: (cp) += 2; \
113: }
114:
115: #define GETLONG(l, cp) { \
116: unsigned char *t_cp = (unsigned char *)(cp); \
117: (l) = ((u32)t_cp[0] << 24) \
118: | ((u32)t_cp[1] << 16) \
119: | ((u32)t_cp[2] << 8) \
120: | ((u32)t_cp[3]) \
121: ; \
122: (cp) += 4; \
123: }
124:
125: #define PUTSHORT(s, cp) { \
126: u16 t_s = (u16)(s); \
127: unsigned char *t_cp = (unsigned char *)(cp); \
128: *t_cp++ = t_s >> 8; \
129: *t_cp = t_s; \
130: (cp) += 2; \
131: }
132:
133: #define PUTLONG(l, cp) { \
134: u32 t_l = (u32)(l); \
135: unsigned char *t_cp = (unsigned char *)(cp); \
136: *t_cp++ = t_l >> 24; \
137: *t_cp++ = t_l >> 16; \
138: *t_cp++ = t_l >> 8; \
139: *t_cp = t_l; \
140: (cp) += 4; \
141: }
142:
1.1.1.2 misho 143: #define CHECK_LEN(header, pp, plen, len) \
144: ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
145:
146: #define ADD_RDLEN(header, pp, plen, len) \
147: (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
1.1.1.3 ! misho 148:
! 149: /* Escape character in our presentation format for names.
! 150: Cannot be '.' or /000 and must be !isprint().
! 151: Note that escaped chars are stored as
! 152: <NAME_ESCAPE> <orig-char+1>
! 153: to ensure that the escaped form of /000 doesn't include /000
! 154: */
! 155: #define NAME_ESCAPE 1
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