1 // Copyright 2016 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
13 func TestListenMulticastUDP(t *testing.T) {
14 testenv.MustHaveExternalNetwork(t)
16 ifcs, err := Interfaces()
21 t.Skip("no network interfaces found")
25 for _, ifc := range ifcs {
26 if ifc.Flags&FlagUp|FlagMulticast != FlagUp|FlagMulticast {
34 t.Skipf("no multicast interfaces found")
37 c1, err := ListenMulticastUDP("udp4", mifc, &UDPAddr{IP: ParseIP("224.0.0.254")})
39 t.Fatalf("multicast not working on %s", runtime.GOOS)
41 c1addr := c1.LocalAddr().(*UDPAddr)
47 c2, err := ListenUDP("udp4", &UDPAddr{IP: IPv4zero, Port: 0})
48 c2addr := c2.LocalAddr().(*UDPAddr)
54 n, err := c2.WriteToUDP([]byte("data"), c1addr)
59 t.Fatalf("got %d; want 4", n)
62 n, err = c1.WriteToUDP([]byte("data"), c2addr)
67 t.Fatalf("got %d; want 4", n)