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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
}
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