package nat import ( "context" "errors" "net" "net/netip" "testing" "github.com/libp2p/go-nat" "github.com/stretchr/testify/require" "go.uber.org/mock/gomock" ) //go:generate sh -c "go run go.uber.org/mock/mockgen -package nat -destination mock_nat_test.go github.com/libp2p/go-nat NAT" func setupMockNAT(t *testing.T) (mockNAT *MockNAT, reset func()) { t.Helper() ctrl := gomock.NewController(t) mockNAT = NewMockNAT(ctrl) mockNAT.EXPECT().GetDeviceAddress().Return(nil, errors.New("nope")) // is only used for logging origDiscoverGateway := discoverGateway discoverGateway = func(ctx context.Context) (nat.NAT, error) { return mockNAT, nil } return mockNAT, func() { discoverGateway = origDiscoverGateway ctrl.Finish() } } func TestAddMapping(t *testing.T) { mockNAT, reset := setupMockNAT(t) defer reset() mockNAT.EXPECT().GetExternalAddress().Return(net.IPv4(1, 2, 3, 4), nil) nat, err := DiscoverNAT(context.Background()) require.NoError(t, err) mockNAT.EXPECT().AddPortMapping(gomock.Any(), "tcp", 10000, gomock.Any(), MappingDuration).Return(1234, nil) require.NoError(t, nat.AddMapping(context.Background(), "tcp", 10000)) _, found := nat.GetMapping("tcp", 9999) require.False(t, found, "didn't expect a port mapping for unmapped port") _, found = nat.GetMapping("udp", 10000) require.False(t, found, "didn't expect a port mapping for unmapped protocol") mapped, found := nat.GetMapping("tcp", 10000) require.True(t, found, "expected port mapping") require.Equal(t, netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 2, 3, 4}), 1234), mapped) } func TestRemoveMapping(t *testing.T) { mockNAT, reset := setupMockNAT(t) defer reset() mockNAT.EXPECT().GetExternalAddress().Return(net.IPv4(1, 2, 3, 4), nil) nat, err := DiscoverNAT(context.Background()) require.NoError(t, err) mockNAT.EXPECT().AddPortMapping(gomock.Any(), "tcp", 10000, gomock.Any(), MappingDuration).Return(1234, nil) require.NoError(t, nat.AddMapping(context.Background(), "tcp", 10000)) _, found := nat.GetMapping("tcp", 10000) require.True(t, found, "expected port mapping") require.Error(t, nat.RemoveMapping(context.Background(), "tcp", 9999), "expected error for unknown mapping") mockNAT.EXPECT().DeletePortMapping(gomock.Any(), "tcp", 10000) require.NoError(t, nat.RemoveMapping(context.Background(), "tcp", 10000)) _, found = nat.GetMapping("tcp", 10000) require.False(t, found, "didn't expect port mapping for deleted mapping") }