1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
// 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 "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
}
|
