1: /* dnsmasq is Copyright (c) 2000-2022 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: #define MIN_PORT 1024 /* first non-reserved port */
20: #define MAX_PORT 65535u
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) */
41: #define C_HESIOD 4 /* hesiod */
42: #define C_ANY 255 /* wildcard match */
43:
44: #define T_A 1
45: #define T_NS 2
46: #define T_MD 3
47: #define T_MF 4
48: #define T_CNAME 5
49: #define T_SOA 6
50: #define T_MB 7
51: #define T_MG 8
52: #define T_MR 9
53: #define T_PTR 12
54: #define T_MINFO 14
55: #define T_MX 15
56: #define T_TXT 16
57: #define T_RP 17
58: #define T_AFSDB 18
59: #define T_RT 21
60: #define T_SIG 24
61: #define T_PX 26
62: #define T_AAAA 28
63: #define T_NXT 30
64: #define T_SRV 33
65: #define T_NAPTR 35
66: #define T_KX 36
67: #define T_DNAME 39
68: #define T_OPT 41
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
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
79: #define T_CAA 257
80:
81: #define EDNS0_OPTION_MAC 65001 /* dyndns.org temporary assignment */
82: #define EDNS0_OPTION_CLIENT_SUBNET 8 /* IANA */
83: #define EDNS0_OPTION_EDE 15 /* IANA - RFC 8914 */
84: #define EDNS0_OPTION_NOMDEVICEID 65073 /* Nominum temporary assignment */
85: #define EDNS0_OPTION_NOMCPEID 65074 /* Nominum temporary assignment */
86: #define EDNS0_OPTION_UMBRELLA 20292 /* Cisco Umbrella temporary assignment */
87:
88: /* RFC-8914 extended errors, negative values are our definitions */
89: #define EDE_UNSET -1 /* No extended DNS error available */
90: #define EDE_OTHER 0 /* Other */
91: #define EDE_USUPDNSKEY 1 /* Unsupported DNSKEY algo */
92: #define EDE_USUPDS 2 /* Unsupported DS Digest */
93: #define EDE_STALE 3 /* Stale answer */
94: #define EDE_FORGED 4 /* Forged answer */
95: #define EDE_DNSSEC_IND 5 /* DNSSEC Indeterminate */
96: #define EDE_DNSSEC_BOGUS 6 /* DNSSEC Bogus */
97: #define EDE_SIG_EXP 7 /* Signature Expired */
98: #define EDE_SIG_NYV 8 /* Signature Not Yet Valid */
99: #define EDE_NO_DNSKEY 9 /* DNSKEY missing */
100: #define EDE_NO_RRSIG 10 /* RRSIGs missing */
101: #define EDE_NO_ZONEKEY 11 /* No Zone Key Bit Set */
102: #define EDE_NO_NSEC 12 /* NSEC Missing */
103: #define EDE_CACHED_ERR 13 /* Cached Error */
104: #define EDE_NOT_READY 14 /* Not Ready */
105: #define EDE_BLOCKED 15 /* Blocked */
106: #define EDE_CENSORED 16 /* Censored */
107: #define EDE_FILTERED 17 /* Filtered */
108: #define EDE_PROHIBITED 18 /* Prohibited */
109: #define EDE_STALE_NXD 19 /* Stale NXDOMAIN */
110: #define EDE_NOT_AUTH 20 /* Not Authoritative */
111: #define EDE_NOT_SUP 21 /* Not Supported */
112: #define EDE_NO_AUTH 22 /* No Reachable Authority */
113: #define EDE_NETERR 23 /* Network error */
114: #define EDE_INVALID_DATA 24 /* Invalid Data */
115:
116:
117:
118:
119: struct dns_header {
120: u16 id;
121: u8 hb3,hb4;
122: u16 qdcount,ancount,nscount,arcount;
123: };
124:
125: #define HB3_QR 0x80 /* Query */
126: #define HB3_OPCODE 0x78
127: #define HB3_AA 0x04 /* Authoritative Answer */
128: #define HB3_TC 0x02 /* TrunCated */
129: #define HB3_RD 0x01 /* Recursion Desired */
130:
131: #define HB4_RA 0x80 /* Recursion Available */
132: #define HB4_AD 0x20 /* Authenticated Data */
133: #define HB4_CD 0x10 /* Checking Disabled */
134: #define HB4_RCODE 0x0f
135:
136: #define OPCODE(x) (((x)->hb3 & HB3_OPCODE) >> 3)
137: #define SET_OPCODE(x, code) (x)->hb3 = ((x)->hb3 & ~HB3_OPCODE) | code
138:
139: #define RCODE(x) ((x)->hb4 & HB4_RCODE)
140: #define SET_RCODE(x, code) (x)->hb4 = ((x)->hb4 & ~HB4_RCODE) | code
141:
142: #define GETSHORT(s, cp) { \
143: unsigned char *t_cp = (unsigned char *)(cp); \
144: (s) = ((u16)t_cp[0] << 8) \
145: | ((u16)t_cp[1]) \
146: ; \
147: (cp) += 2; \
148: }
149:
150: #define GETLONG(l, cp) { \
151: unsigned char *t_cp = (unsigned char *)(cp); \
152: (l) = ((u32)t_cp[0] << 24) \
153: | ((u32)t_cp[1] << 16) \
154: | ((u32)t_cp[2] << 8) \
155: | ((u32)t_cp[3]) \
156: ; \
157: (cp) += 4; \
158: }
159:
160: #define PUTSHORT(s, cp) { \
161: u16 t_s = (u16)(s); \
162: unsigned char *t_cp = (unsigned char *)(cp); \
163: *t_cp++ = t_s >> 8; \
164: *t_cp = t_s; \
165: (cp) += 2; \
166: }
167:
168: #define PUTLONG(l, cp) { \
169: u32 t_l = (u32)(l); \
170: unsigned char *t_cp = (unsigned char *)(cp); \
171: *t_cp++ = t_l >> 24; \
172: *t_cp++ = t_l >> 16; \
173: *t_cp++ = t_l >> 8; \
174: *t_cp = t_l; \
175: (cp) += 4; \
176: }
177:
178: #define CHECK_LEN(header, pp, plen, len) \
179: ((size_t)((pp) - (unsigned char *)(header) + (len)) <= (plen))
180:
181: #define ADD_RDLEN(header, pp, plen, len) \
182: (!CHECK_LEN(header, pp, plen, len) ? 0 : (((pp) += (len)), 1))
183:
184: /* Escape character in our presentation format for names.
185: Cannot be '.' or /000 and must be !isprint().
186: Note that escaped chars are stored as
187: <NAME_ESCAPE> <orig-char+1>
188: to ensure that the escaped form of /000 doesn't include /000
189: */
190: #define NAME_ESCAPE 1
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