return error rather than do nothing when have no response (#138)

comzyh · shawn1m · commit a7f001d58ada · 2019-03-10T15:38:10.000+08:00
diff --git a/core/inbound/server.go b/core/inbound/server.go
@@ -134,6 +134,7 @@ func (s *Server) ServeDNS(w dns.ResponseWriter, q *dns.Msg) {
 	responseMessage := s.dispatcher.Exchange(q, inboundIP)
 
 	if responseMessage == nil {
+		dns.HandleFailed(w, q)
 		return
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -134,6 +134,7 @@ func (s Server) ServeDNS(w dns.ResponseWriter, q dns.Msg) {`
`134`	`134`	`responseMessage := s.dispatcher.Exchange(q, inboundIP)`
`135`	`135`
`136`	`136`	`if responseMessage == nil {`
	`137`	`+ dns.HandleFailed(w, q)`
`137`	`138`	`return`
`138`	`139`	`}`
`139`	`140`