Merge remote-tracking branch 'clash/dev' into Meta

# Conflicts:
#	.github/workflows/docker.yml
#	dns/server.go
#	go.mod
#	go.sum
#	hub/executor/executor.go
#	test/go.mod
#	test/go.sum

dns/server.go

@@ -43,15 +43,15 @@ func handlerWithContext(handler handler, msg *D.Msg) (*D.Msg, error) {
 	return handler(ctx, msg)
 }
 
-func (s *Server) SetHandler(handler handler) {
+func (s *Server) setHandler(handler handler) {
 	s.handler = handler
 }
 
-func ReCreateServer(addr string, resolver *Resolver, mapper *ResolverEnhancer) error {
+func ReCreateServer(addr string, resolver *Resolver, mapper *ResolverEnhancer) {
 	if addr == address && resolver != nil {
-		handler := NewHandler(resolver, mapper)
-		server.SetHandler(handler)
-		return nil
+		handler := newHandler(resolver, mapper)
+		server.setHandler(handler)
+		return
 	}
 
 	if server.Server != nil {
@@ -60,33 +60,43 @@ func ReCreateServer(addr string, resolver *Resolver, mapper *ResolverEnhancer) e
 		address = ""
 	}
 
+	var err error
+	defer func() {
+		if err != nil {
+			log.Errorln("Start DNS server error: %s", err.Error())
+		}
+	}()
+
 	_, port, err := net.SplitHostPort(addr)
 	if port == "0" || port == "" || err != nil {
-		return nil
+		return
 	}
 
 	udpAddr, err := net.ResolveUDPAddr("udp", addr)
 	if err != nil {
-		return err
+		return
 	}
 
 	p, err := net.ListenUDP("udp", udpAddr)
 	if err != nil {
-		return err
+		return
 	}
 
 	err = sockopt.UDPReuseaddr(p)
 	if err != nil {
 		log.Warnln("Failed to Reuse UDP Address: %s", err)
+
+		err = nil
 	}
 
 	address = addr
-	handler := NewHandler(resolver, mapper)
+	handler := newHandler(resolver, mapper)
 	server = &Server{handler: handler}
 	server.Server = &D.Server{Addr: addr, PacketConn: p, Handler: server}
 
 	go func() {
 		server.ActivateAndServe()
 	}()
-	return nil
+
+	log.Infoln("DNS server listening at: %s", p.LocalAddr().String())
 }