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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"internal/testenv"
"runtime"
"testing"
)
func TestListenMulticastUDP(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
ifcs, err := Interfaces()
if err != nil {
t.Skip(err.Error())
}
if len(ifcs) == 0 {
t.Skip("no network interfaces found")
}
var mifc *Interface
for _, ifc := range ifcs {
if ifc.Flags&FlagUp|FlagMulticast != FlagUp|FlagMulticast {
continue
}
mifc = &ifc
break
}
if mifc == nil {
t.Skipf("no multicast interfaces found")
}
c1, err := ListenMulticastUDP("udp4", mifc, &UDPAddr{IP: ParseIP("224.0.0.254")})
if err != nil {
t.Fatalf("multicast not working on %s: %v", runtime.GOOS, err)
}
c1addr := c1.LocalAddr().(*UDPAddr)
if err != nil {
t.Fatal(err)
}
defer c1.Close()
c2, err := ListenUDP("udp4", &UDPAddr{IP: IPv4zero, Port: 0})
c2addr := c2.LocalAddr().(*UDPAddr)
if err != nil {
t.Fatal(err)
}
defer c2.Close()
n, err := c2.WriteToUDP([]byte("data"), c1addr)
if err != nil {
t.Fatal(err)
}
if n != 4 {
t.Fatalf("got %d; want 4", n)
}
n, err = c1.WriteToUDP([]byte("data"), c2addr)
if err != nil {
t.Fatal(err)
}
if n != 4 {
t.Fatalf("got %d; want 4", n)
}
}