Fix missing nil check for URLTest

outbound/urltest.go

@@ -43,6 +43,7 @@ func NewURLTest(ctx context.Context, router adapter.Router, logger log.ContextLo
 	outbound := &URLTest{
 		myOutboundAdapter: myOutboundAdapter{
 			protocol:     C.TypeURLTest,
+			network:      []string{N.NetworkTCP, N.NetworkUDP},
 			router:       router,
 			logger:       logger,
 			tag:          tag,
@@ -61,13 +62,6 @@ func NewURLTest(ctx context.Context, router adapter.Router, logger log.ContextLo
 	return outbound, nil
 }
 
-func (s *URLTest) Network() []string {
-	if s.group == nil {
-		return []string{N.NetworkTCP, N.NetworkUDP}
-	}
-	return s.group.Select(N.NetworkTCP).Network()
-}
-
 func (s *URLTest) Start() error {
 	outbounds := make([]adapter.Outbound, 0, len(s.tags))
 	for i, tag := range s.tags {
@@ -93,7 +87,12 @@ func (s *URLTest) Close() error {
 }
 
 func (s *URLTest) Now() string {
-	return s.group.Select(N.NetworkTCP).Tag()
+	if s.group.selectedOutboundTCP != nil {
+		return s.group.selectedOutboundTCP.Tag()
+	} else if s.group.selectedOutboundUDP != nil {
+		return s.group.selectedOutboundUDP.Tag()
+	}
+	return ""
 }
 
 func (s *URLTest) All() []string {
@@ -111,6 +110,9 @@ func (s *URLTest) CheckOutbounds() {
 func (s *URLTest) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
 	s.group.Touch()
 	outbound := s.group.Select(network)
+	if outbound == nil {
+		return nil, E.New("missing supported outbound")
+	}
 	conn, err := outbound.DialContext(ctx, network, destination)
 	if err == nil {
 		return s.group.interruptGroup.NewConn(conn, interrupt.IsExternalConnectionFromContext(ctx)), nil
@@ -123,6 +125,9 @@ func (s *URLTest) DialContext(ctx context.Context, network string, destination M
 func (s *URLTest) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
 	s.group.Touch()
 	outbound := s.group.Select(N.NetworkUDP)
+	if outbound == nil {
+		return nil, E.New("missing supported outbound")
+	}
 	conn, err := outbound.ListenPacket(ctx, destination)
 	if err == nil {
 		return s.group.interruptGroup.NewPacketConn(conn, interrupt.IsExternalConnectionFromContext(ctx)), nil
@@ -346,12 +351,12 @@ func (g *URLTestGroup) urlTest(ctx context.Context, force bool) (map[string]uint
 func (g *URLTestGroup) performUpdateCheck() {
 	outbound := g.Select(N.NetworkTCP)
 	var updated bool
-	if outbound != g.selectedOutboundTCP {
+	if outbound != nil && outbound != g.selectedOutboundTCP {
 		g.selectedOutboundTCP = outbound
 		updated = true
 	}
 	outbound = g.Select(N.NetworkUDP)
-	if outbound != g.selectedOutboundUDP {
+	if outbound != nil && outbound != g.selectedOutboundUDP {
 		g.selectedOutboundUDP = outbound
 		updated = true
 	}