34 lines
795 B
Go
34 lines
795 B
Go
package msg
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import (
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"net"
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"github.com/miekg/dns"
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)
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// HostType returns the DNS type of what is encoded in the Service Host field. We're reusing
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// dns.TypeXXX to not reinvent a new set of identifiers.
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//
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// dns.TypeA: the service's Host field contains an A record.
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// dns.TypeAAAA: the service's Host field contains an AAAA record.
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// dns.TypeCNAME: the service's Host field contains a name.
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//
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// Note that a service can double/triple as a TXT record or MX record.
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func (s *Service) HostType() (what uint16, normalized net.IP) {
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ip := net.ParseIP(s.Host)
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switch {
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case ip == nil:
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return dns.TypeCNAME, nil
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case ip.To4() != nil:
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return dns.TypeA, ip.To4()
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case ip.To4() == nil:
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return dns.TypeAAAA, ip.To16()
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}
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// This should never be reached.
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return dns.TypeNone, nil
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}
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