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
|
package main
import (
"errors"
"net"
)
func parseEndpoint(s string) (*net.UDPAddr, error) {
// ensure that the host is an IP address
host, _, err := net.SplitHostPort(s)
if err != nil {
return nil, err
}
if ip := net.ParseIP(host); ip == nil {
return nil, errors.New("Failed to parse IP address: " + host)
}
// parse address and port
addr, err := net.ResolveUDPAddr("udp", s)
if err != nil {
return nil, err
}
return addr, err
}
func ListenerClose(l *Listener) (err error) {
if l.active {
err = CloseIPv4Socket(l.sock)
l.active = false
}
return
}
func (l *Listener) Init() {
l.update = make(chan struct{}, 1)
ListenerClose(l)
}
func ListeningUpdate(device *Device) error {
netc := &device.net
netc.mutex.Lock()
defer netc.mutex.Unlock()
// close existing sockets
if err := ListenerClose(&netc.ipv4); err != nil {
return err
}
if err := ListenerClose(&netc.ipv6); err != nil {
return err
}
// open new sockets
if device.tun.isUp.Get() {
// listen on IPv4
{
list := &netc.ipv6
sock, port, err := CreateIPv4Socket(netc.port)
if err != nil {
return err
}
netc.port = port
list.sock = sock
list.active = true
if err := SetMark(list.sock, netc.fwmark); err != nil {
ListenerClose(list)
return err
}
signalSend(list.update)
}
// listen on IPv6
{
list := &netc.ipv6
sock, port, err := CreateIPv6Socket(netc.port)
if err != nil {
return err
}
netc.port = port
list.sock = sock
list.active = true
if err := SetMark(list.sock, netc.fwmark); err != nil {
ListenerClose(list)
return err
}
signalSend(list.update)
}
// TODO: clear endpoint caches
}
return nil
}
func ListeningClose(device *Device) error {
netc := &device.net
netc.mutex.Lock()
defer netc.mutex.Unlock()
if err := ListenerClose(&netc.ipv4); err != nil {
return err
}
signalSend(netc.ipv4.update)
if err := ListenerClose(&netc.ipv6); err != nil {
return err
}
signalSend(netc.ipv6.update)
return nil
}
|
