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