/
dns.go
156 lines (135 loc) · 3.53 KB
/
dns.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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
package errors
import (
"encoding/json"
"fmt"
"github.com/miekg/dns"
"net"
)
const (
UDP_TRANSPORT = 17
TCP_TRANSPORT = 6
)
var PROTO_TO_STR = map[int]string{
TCP_TRANSPORT: "TCP",
UDP_TRANSPORT: "UDP",
}
var STR_TO_PROTO = map[string]int{
"": UDP_TRANSPORT,
"TCP": TCP_TRANSPORT,
"tcp": TCP_TRANSPORT,
"UDP": UDP_TRANSPORT,
"udp": UDP_TRANSPORT,
}
type serializedServfailError struct {
Type string `json:"type"`
Qname string `json:"qname"`
Qtype string `json:"qtype"`
Addr string `json:"ip"`
Proto string `json:"protocol"`
}
type ServfailError struct {
qname string
qtype uint16
addr net.IP
proto int
}
func NewServfailError(qname string, qtype uint16, addr net.IP, proto int) *ServfailError {
se := new(ServfailError)
se.qname = qname
se.qtype = qtype
se.addr = addr
se.proto = proto
return se
}
func (se *ServfailError) MarshalJSON() ([]byte, error) {
sse := new(serializedServfailError)
sse.Type = dns.RcodeToString[dns.RcodeServerFailure]
sse.Qname = se.qname
sse.Qtype = dns.TypeToString[se.qtype]
sse.Addr = se.addr.String()
sse.Proto = PROTO_TO_STR[se.proto]
return json.Marshal(sse)
}
func (se *ServfailError) UnmarshalJSON(bstr []byte) error {
sse := new(serializedServfailError)
if err := json.Unmarshal(bstr, sse); err != nil {
return err
}
se.qname = sse.Qname
se.qtype = dns.StringToType[sse.Qtype]
se.addr = net.ParseIP(sse.Addr)
se.proto = STR_TO_PROTO[sse.Proto]
return nil
}
func (se *ServfailError) Error() string {
return fmt.Sprintf("received a SERVFAIL while trying to query %s %s? from %s with %s", se.qname, dns.TypeToString[se.qtype], se.addr.String(), PROTO_TO_STR[se.proto])
}
type serializedNXDomainError struct {
Type string `json:"type"`
Qname string `json:"qname"`
Qtype string `json:"qtype"`
Addr string `json:"ip"`
Proto string `json:"protocol"`
}
type NXDomainError struct {
qname string
qtype uint16
addr net.IP
proto int
}
func NewNXDomainError(qname string, qtype uint16, addr net.IP, proto int) *NXDomainError {
nx := new(NXDomainError)
nx.qname = qname
nx.qtype = qtype
nx.addr = addr
nx.proto = proto
return nx
}
func (nx *NXDomainError) Error() string {
return fmt.Sprintf("received a NXDomain while trying to query %s %s? from %s with %s", nx.qname, dns.TypeToString[nx.qtype], nx.addr.String(), PROTO_TO_STR[nx.proto])
}
func (nx *NXDomainError) MarshalJSON() ([]byte, error) {
snx := new(serializedNXDomainError)
snx.Type = dns.RcodeToString[dns.RcodeNameError]
snx.Qname = nx.qname
snx.Qtype = dns.TypeToString[nx.qtype]
snx.Addr = nx.addr.String()
snx.Proto = PROTO_TO_STR[nx.proto]
return json.Marshal(snx)
}
func (nx *NXDomainError) UnmarshalJSON(bstr []byte) error {
snx := new(serializedNXDomainError)
if err := json.Unmarshal(bstr, snx); err != nil {
return err
}
nx.qname = snx.Qname
nx.qtype = dns.StringToType[snx.Qtype]
nx.addr = net.ParseIP(snx.Addr)
nx.proto = STR_TO_PROTO[snx.Proto]
return nil
}
type serializedNoNameError struct {
Name string `json:"name"`
}
type NoNameServerError struct {
name string
}
func (ne *NoNameServerError) MarshalJSON() ([]byte, error) {
sne := new(serializedNoNameError)
sne.Name = ne.name
return json.Marshal(sne)
}
func (ne *NoNameServerError) UnmarshalJSON(bstr []byte) error {
sne := new(serializedNoNameError)
if err := json.Unmarshal(bstr, sne); err != nil {
return err
}
ne.name = sne.Name
return nil
}
func NewNoNameServerError(name string) *NoNameServerError {
return &NoNameServerError{name}
}
func (ne *NoNameServerError) Error() string {
return fmt.Sprintf("%s has no nameservers", ne.name)
}