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