55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package minimal
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import (
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"context"
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"fmt"
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"time"
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"github.com/coredns/coredns/plugin"
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"github.com/coredns/coredns/plugin/pkg/nonwriter"
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"github.com/coredns/coredns/plugin/pkg/response"
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"github.com/miekg/dns"
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)
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// minimalHandler implements the plugin.Handler interface.
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type minimalHandler struct {
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Next plugin.Handler
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}
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func (m *minimalHandler) Name() string { return "minimal" }
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func (m *minimalHandler) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
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nw := nonwriter.New(w)
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rcode, err := plugin.NextOrFailure(m.Name(), m.Next, ctx, nw, r)
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if err != nil {
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return rcode, err
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}
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ty, _ := response.Typify(nw.Msg, time.Now().UTC())
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cl := response.Classify(ty)
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// if response is Denial or Error pass through also if the type is Delegation pass through
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if cl == response.Denial || cl == response.Error || ty == response.Delegation {
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w.WriteMsg(nw.Msg)
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return 0, nil
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}
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if ty != response.NoError {
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w.WriteMsg(nw.Msg)
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return 0, plugin.Error("minimal", fmt.Errorf("unhandled response type %q for %q", ty, nw.Msg.Question[0].Name))
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}
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// copy over the original Msg params, deep copy not required as RRs are not modified
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d := &dns.Msg{
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MsgHdr: nw.Msg.MsgHdr,
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Compress: nw.Msg.Compress,
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Question: nw.Msg.Question,
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Answer: nw.Msg.Answer,
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Ns: nil,
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Extra: nil,
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}
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w.WriteMsg(d)
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return 0, nil
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}
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