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package dnstap
import (
"fmt"
"io"
"golang.org/x/net/context"
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/dnstap/msg"
"github.com/coredns/coredns/middleware/dnstap/taprw"
tap "github.com/dnstap/golang-dnstap"
"github.com/miekg/dns"
)
type Dnstap struct {
Next middleware.Handler
Out io.Writer
Pack bool
}
func tapMessageTo(w io.Writer, m *tap.Message) error {
frame, err := msg.Marshal(m)
if err != nil {
return fmt.Errorf("marshal: %s", err)
}
_, err = w.Write(frame)
return err
}
func (h Dnstap) TapMessage(m *tap.Message) error {
return tapMessageTo(h.Out, m)
}
func (h Dnstap) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
rw := &taprw.ResponseWriter{ResponseWriter: w, Taper: &h, Query: r, Pack: h.Pack}
rw.QueryEpoch()
code, err := middleware.NextOrFailure(h.Name(), h.Next, ctx, rw, r)
if err != nil {
// ignore dnstap errors
return code, err
}
if err := rw.DnstapError(); err != nil {
return code, middleware.Error("dnstap", err)
}
return code, nil
}
func (h Dnstap) Name() string { return "dnstap" }
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