20 lines
519 B
Go
20 lines
519 B
Go
package dnsutil
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import (
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"errors"
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"github.com/miekg/dns"
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)
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// TrimZone removes the zone component from q. It returns the trimmed
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// name or an error is zone is longer then qname. The trimmed name will be returned
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// without a trailing dot.
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func TrimZone(q string, z string) (string, error) {
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zl := dns.CountLabel(z)
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i, ok := dns.PrevLabel(q, zl)
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if ok || i-1 < 0 {
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return "", errors.New("trimzone: overshot qname: " + q + "for zone " + z)
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}
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// This includes the '.', remove on return
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return q[:i-1], nil
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}
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