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package dnssec
import (
"time"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
// ResponseWriter sign the response on the fly.
type ResponseWriter struct {
dns.ResponseWriter
d Dnssec
server string // server label for metrics.
}
// WriteMsg implements the dns.ResponseWriter interface.
func (d *ResponseWriter) WriteMsg(res *dns.Msg) error {
// By definition we should sign anything that comes back, we should still figure out for
// which zone it should be.
state := request.Request{W: d.ResponseWriter, Req: res}
zone := plugin.Zones(d.d.zones).Matches(state.Name())
if zone == "" {
return d.ResponseWriter.WriteMsg(res)
}
state.Zone = zone
if state.Do() {
res = d.d.Sign(state, time.Now().UTC(), d.server)
cacheSize.WithLabelValues(d.server, "signature").Set(float64(d.d.cache.Len()))
}
state.SizeAndDo(res)
return d.ResponseWriter.WriteMsg(res)
}
// Write implements the dns.ResponseWriter interface.
func (d *ResponseWriter) Write(buf []byte) (int, error) {
log.Warning("Dnssec called with Write: not signing reply")
n, err := d.ResponseWriter.Write(buf)
return n, err
}
// Hijack implements the dns.ResponseWriter interface.
func (d *ResponseWriter) Hijack() { d.ResponseWriter.Hijack() }
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