forked from bortzmeyer/grong
/
as112.go
131 lines (118 loc) · 3.6 KB
/
as112.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* A name server for the AS112 sink system. See http://www.as112.net/
Stephane Bortzmeyer <stephane+grong@bortzmeyer.org>
*/
package responder
import (
"regexp"
"strings"
"container/vector"
"./types"
)
const as112Regexp = "(168\\.192\\.in-addr\\.arpa|154\\.169\\.in-addr\\.arpa|16\\.172\\.in-addr\\.arpa|17\\.172\\.in-addr\\.arpa|18\\.172\\.in-addr\\.arpa|19\\.172\\.in-addr\\.arpa|20\\.172\\.in-addr\\.arpa|21\\.172\\.in-addr\\.arpa|22\\.172\\.in-addr\\.arpa|23\\.172\\.in-addr\\.arpa|24\\.172\\.in-addr\\.arpa|25\\.172\\.in-addr\\.arpa|26\\.172\\.in-addr\\.arpa|27\\.172\\.in-addr\\.arpa|28\\.172\\.in-addr\\.arpa|29\\.172\\.in-addr\\.arpa|30\\.172\\.in-addr\\.arpa|31\\.172\\.in-addr\\.arpa|10\\.in-addr\\.arpa)$"
const defaultTTL = 3600
var (
as112Domain = regexp.MustCompile("^" + as112Regexp)
as112SubDomain = regexp.MustCompile("\\." + as112Regexp)
// Answers to "TXT hostname.as112.net"
hostnameAnswers = [...]string{
"Unknown location on Earth.",
"GRONG, name server written in Go.",
"See http://as112.net/ for more information.",
}
// Name servers of AS112, currently two
as112nameServers = [...]string{
"blackhole-1.iana.org",
"blackhole-2.iana.org",
}
hostnamesoa = types.SOArecord{
Mname: "NOT-CONFIGURED.as112.example.net", // Put the real host name
Rname: "UNKNOWN.as112.example.net", // Put your email address (with @ replaced by .)
Serial: 2003030100,
Refresh: 3600,
Retry: 600,
Expire: 2592000,
Minimum: 15,
}
as112soa = types.SOArecord{
Mname: "prisoner.iana.org",
Rname: "hostmaster.root-servers.org",
Serial: 2002040800,
Refresh: 1800,
Retry: 900,
Expire: 604800,
Minimum: 604800,
}
)
func nsRecords(domain string, asection *vector.Vector) {
for i := 0; i < len(as112nameServers); i++ {
asection.Push(types.RR{
Name: domain,
TTL: defaultTTL,
Type: types.NS,
Class: types.IN,
Data: types.Encode(as112nameServers[i]),
})
}
}
func soaRecord(domain string, soa types.SOArecord) (result types.RR) {
result = types.RR{
Name: domain,
TTL: defaultTTL,
Type: types.SOA,
Class: types.IN,
Data: types.EncodeSOA(soa),
}
return
}
func Respond(query types.DNSquery) (result types.DNSresponse) {
result.Responsecode = types.SERVFAIL
qname := strings.ToLower(query.Qname)
var asection, nssection vector.Vector
if query.Qclass == types.IN {
if as112Domain.MatchString(qname) {
result.Responsecode = types.NOERROR
if (types.QMatches(query.Qtype, types.NS)) {
nsRecords(query.Qname, &asection)
}
if (types.QMatches(query.Qtype, types.SOA)) {
asection.Push(soaRecord(query.Qname, as112soa))
}
}
matches := as112SubDomain.MatchStrings(qname)
if len(matches) > 0 {
result.Responsecode = types.NXDOMAIN
nssection.Push(soaRecord(matches[1], as112soa))
}
if qname == "hostname.as112.net" {
result.Responsecode = types.NOERROR
if types.QMatches(query.Qtype, types.TXT) {
for i := 0; i < len(hostnameAnswers); i++ {
asection.Push(types.RR{
Name: query.Qname,
TTL: defaultTTL,
Type: types.TXT,
Class: types.IN,
Data: types.ToTXT(hostnameAnswers[i]),
})
}
}
if (types.QMatches(query.Qtype, types.NS)) {
nsRecords(query.Qname, &asection)
}
if (types.QMatches(query.Qtype, types.SOA)) {
asection.Push(soaRecord(query.Qname, hostnamesoa))
}
}
}
data := asection.Data()
result.Asection = make([]types.RR, len(data))
for i := 0; i < len(data); i++ {
result.Asection[i] = data[i].(types.RR)
}
data = nssection.Data()
result.Nssection = make([]types.RR, len(data))
for i := 0; i < len(data); i++ {
result.Nssection[i] = data[i].(types.RR)
}
return
}