fix(port,session): harden port registry and fix concurrent allocation

internal/session/session_test.go

@@ -396,6 +396,12 @@ func TestHandleTCPIPForward_Table(t *testing.T) {
 		err := s.HandleTCPIPForward(req)
 		assert.NoError(t, err)
 		assert.Equal(t, uint16(12345), s.forwarder.ForwardedPort())
+
+		defer func() {
+			if l := s.forwarder.Listener(); l != nil {
+				_ = l.Close()
+			}
+		}()
 	})
 
 	t.Run("Invalid Payload", func(t *testing.T) {
@@ -1037,7 +1043,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 	s := &session{}
 
 	t.Run("Short Address", func(t *testing.T) {
-		_, _, err := s.parseForwardPayload([]byte{0, 0, 0, 4})
+		_, _, _, err := s.parseForwardPayload([]byte{0, 0, 0, 4})
 		if err == nil {
 			t.Error("expected error, got nil")
 		}
@@ -1045,7 +1051,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 
 	t.Run("Short Port", func(t *testing.T) {
 		payload := append([]byte{0, 0, 0, 4}, []byte("addr")...)
-		_, _, err := s.parseForwardPayload(payload)
+		_, _, _, err := s.parseForwardPayload(payload)
 		if err == nil {
 			t.Error("expected error, got nil")
 		}
@@ -1056,7 +1062,7 @@ func TestParseForwardPayload_Errors(t *testing.T) {
 		portBuf := make([]byte, 4)
 		binary.BigEndian.PutUint32(portBuf, 22)
 		payload = append(payload, portBuf...)
-		_, _, err := s.parseForwardPayload(payload)
+		_, _, _, err := s.parseForwardPayload(payload)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "port is block") {
@@ -1220,7 +1226,7 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 		s, _, mPort, _, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(false)
-		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 1234)
+		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 1234, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "already in use") {
@@ -1242,7 +1248,7 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 		}(l)
 		port := uint16(l.Addr().(*net.TCPAddr).Port)
 
-		err = s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", port)
+		err = s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", port, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "already in use") {
@@ -1255,7 +1261,7 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(true)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(false)
-		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 0)
+		err := s.HandleTCPForward(getReq(t, cConn, sReqs), "localhost", 0, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "Failed to register") {
@@ -1264,16 +1270,16 @@ func TestHandleTCPForward_Failures(t *testing.T) {
 	})
 
 	t.Run("Finalize fail (Reply fail)", func(t *testing.T) {
-		s, mRegistry, mPort, _, sReqs, cConn, cleanup := setup(t)
+		s, mRegistry, mPort, sConn, sReqs, cConn, cleanup := setup(t)
 		defer cleanup()
 		mPort.On("Claim", mock.Anything).Return(true)
 		mRegistry.On("Register", mock.Anything, mock.Anything).Return(true)
 		req := getReq(t, cConn, sReqs)
 		err := cConn.Close()
 		assert.NoError(t, err)
-		time.Sleep(100 * time.Millisecond)
+		_ = sConn.Wait()
 
-		err = s.HandleTCPForward(req, "localhost", 0)
+		err = s.HandleTCPForward(req, "localhost", 0, false)
 		if err == nil {
 			t.Error("expected error, got nil")
 		} else if !strings.Contains(err.Error(), "Failed to finalize forwarding") {