/
caa.go
42 lines (36 loc) · 956 Bytes
/
caa.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
// sean at shanghai 2021
package main
import (
"github.com/miekg/dns"
)
type CAAHandler struct{}
func (cca *CAAHandler) FillRecords(req *dns.Msg, records []DNSRecord) *dns.Msg {
m := new(dns.Msg)
m.SetReply(req)
rr := make([]dns.CAA, len(records))
for idx, record := range records {
rr[idx].Hdr.Name = req.Question[0].Name
rr[idx].Hdr.Rrtype = dns.TypeCAA
rr[idx].Hdr.Class = dns.ClassINET
rr[idx].Hdr.Ttl = record.Ttl
rr[idx].Value = record.CAAValue
rr[idx].Tag = record.CAATag
rr[idx].Flag = record.CAAFlag
m.Answer = append(m.Answer, &rr[idx])
}
return m
}
func (caa *CAAHandler) CheckRecord(record *DNSRecord) error {
if record.CAAValue == "" || record.CAATag == "" || record.CAAFlag == 0 {
return ErrBadValue
}
return nil
}
func (caa *CAAHandler) RRToRecord(msg dns.RR) DNSRecord {
var record DNSRecord
v := msg.(*dns.CAA)
record.CAAValue = v.Value
record.CAATag = v.Tag
record.CAAFlag = v.Flag
return record
}