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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)
- }
- }
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