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server: update comment (#1213)

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Because we have our own mux we can't depend on the dns.Mux to do the
Question section checking for us. Clarify this in the comment.
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Miek Gieben 2017-11-10 11:19:49 +00:00 • committed by GitHub
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core/dnsserver/server.go
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@ -179,8 +179,8 @@ func (s *Server) Address() string { return s.Addr }
// defined in the request so that the correct zone
// (configuration and plugin stack) will handle the request.
func (s *Server) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) {
// our dns library protects us against really invalid packets, we can still
// get semi valid packets. Drop them here.
// The default dns.Mux checks the question section size, but we have our
// own mux here. Check if we have a question section. If not drop them here.
if r == nil || len(r.Question) == 0 {
DefaultErrorFunc(w, r, dns.RcodeServerFailure)
return