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// Copyright 2011 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 (
"fmt"
"os"
"runtime"
"testing"
)
var ipv4MulticastListenerTests = []struct {
net string
gaddr *UDPAddr // see RFC 4727
}{
{"udp", &UDPAddr{IP: IPv4(224, 0, 0, 254), Port: 12345}},
{"udp4", &UDPAddr{IP: IPv4(224, 0, 0, 254), Port: 12345}},
}
// TestIPv4MulticastListener tests both single and double listen to a
// test listener with same address family, same group address and same
// port.
func TestIPv4MulticastListener(t *testing.T) {
switch runtime.GOOS {
case "plan9":
t.Skipf("skipping test on %q", runtime.GOOS)
}
closer := func(cs []*UDPConn) {
for _, c := range cs {
if c != nil {
c.Close()
}
}
}
for _, ifi := range []*Interface{loopbackInterface(), nil} {
// Note that multicast interface assignment by system
// is not recommended because it usually relies on
// routing stuff for finding out an appropriate
// nexthop containing both network and link layer
// adjacencies.
if ifi == nil && !*testExternal {
continue
}
for _, tt := range ipv4MulticastListenerTests {
var err error
cs := make([]*UDPConn, 2)
if cs[0], err = ListenMulticastUDP(tt.net, ifi, tt.gaddr); err != nil {
t.Fatalf("First ListenMulticastUDP on %v failed: %v", ifi, err)
}
if err := checkMulticastListener(cs[0], tt.gaddr.IP); err != nil {
closer(cs)
t.Fatal(err)
}
if cs[1], err = ListenMulticastUDP(tt.net, ifi, tt.gaddr); err != nil {
closer(cs)
t.Fatalf("Second ListenMulticastUDP on %v failed: %v", ifi, err)
}
if err := checkMulticastListener(cs[1], tt.gaddr.IP); err != nil {
closer(cs)
t.Fatal(err)
}
closer(cs)
}
}
}
var ipv6MulticastListenerTests = []struct {
net string
gaddr *UDPAddr // see RFC 4727
}{
{"udp", &UDPAddr{IP: ParseIP("ff01::114"), Port: 12345}},
{"udp", &UDPAddr{IP: ParseIP("ff02::114"), Port: 12345}},
{"udp", &UDPAddr{IP: ParseIP("ff04::114"), Port: 12345}},
{"udp", &UDPAddr{IP: ParseIP("ff05::114"), Port: 12345}},
{"udp", &UDPAddr{IP: ParseIP("ff08::114"), Port: 12345}},
{"udp", &UDPAddr{IP: ParseIP("ff0e::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff01::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff02::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff04::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff05::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff08::114"), Port: 12345}},
{"udp6", &UDPAddr{IP: ParseIP("ff0e::114"), Port: 12345}},
}
// TestIPv6MulticastListener tests both single and double listen to a
// test listener with same address family, same group address and same
// port.
func TestIPv6MulticastListener(t *testing.T) {
switch runtime.GOOS {
case "plan9", "solaris":
t.Skipf("skipping test on %q", runtime.GOOS)
}
if !supportsIPv6 {
t.Skip("ipv6 is not supported")
}
if os.Getuid() != 0 {
t.Skip("skipping test; must be root")
}
closer := func(cs []*UDPConn) {
for _, c := range cs {
if c != nil {
c.Close()
}
}
}
for _, ifi := range []*Interface{loopbackInterface(), nil} {
// Note that multicast interface assignment by system
// is not recommended because it usually relies on
// routing stuff for finding out an appropriate
// nexthop containing both network and link layer
// adjacencies.
if ifi == nil && (!*testExternal || !*testIPv6) {
continue
}
for _, tt := range ipv6MulticastListenerTests {
var err error
cs := make([]*UDPConn, 2)
if cs[0], err = ListenMulticastUDP(tt.net, ifi, tt.gaddr); err != nil {
t.Fatalf("First ListenMulticastUDP on %v failed: %v", ifi, err)
}
if err := checkMulticastListener(cs[0], tt.gaddr.IP); err != nil {
closer(cs)
t.Fatal(err)
}
if cs[1], err = ListenMulticastUDP(tt.net, ifi, tt.gaddr); err != nil {
closer(cs)
t.Fatalf("Second ListenMulticastUDP on %v failed: %v", ifi, err)
}
if err := checkMulticastListener(cs[1], tt.gaddr.IP); err != nil {
closer(cs)
t.Fatal(err)
}
closer(cs)
}
}
}
func checkMulticastListener(c *UDPConn, ip IP) error {
if ok, err := multicastRIBContains(ip); err != nil {
return err
} else if !ok {
return fmt.Errorf("%q not found in multicast RIB", ip.String())
}
la := c.LocalAddr()
if la, ok := la.(*UDPAddr); !ok || la.Port == 0 {
return fmt.Errorf("got %v; expected a proper address with non-zero port number", la)
}
return nil
}
func multicastRIBContains(ip IP) (bool, error) {
switch runtime.GOOS {
case "dragonfly", "netbsd", "openbsd", "plan9", "solaris", "windows":
return true, nil // not implemented yet
case "linux":
if runtime.GOARCH == "arm" || runtime.GOARCH == "alpha" {
return true, nil // not implemented yet
}
}
ift, err := Interfaces()
if err != nil {
return false, err
}
for _, ifi := range ift {
ifmat, err := ifi.MulticastAddrs()
if err != nil {
return false, err
}
for _, ifma := range ifmat {
if ifma.(*IPAddr).IP.Equal(ip) {
return true, nil
}
}
}
return false, nil
}
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