25 lines
671 B
Go
25 lines
671 B
Go
package autopath
|
|
|
|
import (
|
|
"strings"
|
|
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// cnamer will prefix the answer section with a cname that points from original qname to the
|
|
// name of the first RR. It will also update the question section and put original in there.
|
|
func cnamer(m *dns.Msg, original string) {
|
|
for _, a := range m.Answer {
|
|
if strings.EqualFold(original, a.Header().Name) {
|
|
continue
|
|
}
|
|
m.Answer = append(m.Answer, nil)
|
|
copy(m.Answer[1:], m.Answer)
|
|
m.Answer[0] = &dns.CNAME{
|
|
Hdr: dns.RR_Header{Name: original, Rrtype: dns.TypeCNAME, Class: dns.ClassINET, Ttl: a.Header().Ttl},
|
|
Target: a.Header().Name,
|
|
}
|
|
break
|
|
}
|
|
m.Question[0].Name = original
|
|
}
|