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
|
// +build !windows
package main
import (
"net"
"time"
"github.com/jedisct1/dlog"
)
func NetProbe(proxy *Proxy, address string, timeout int) error {
if len(address) <= 0 || timeout == 0 {
return nil
}
if captivePortalHandler, err := ColdStart(proxy); err == nil {
if captivePortalHandler != nil {
defer captivePortalHandler.Stop()
}
} else {
dlog.Critical(err)
}
remoteUDPAddr, err := net.ResolveUDPAddr("udp", address)
if err != nil {
return err
}
retried := false
if timeout < 0 {
timeout = MaxTimeout
} else {
timeout = Min(MaxTimeout, timeout)
}
for tries := timeout; tries > 0; tries-- {
pc, err := net.DialUDP("udp", nil, remoteUDPAddr)
if err != nil {
if !retried {
retried = true
dlog.Notice("Network not available yet -- waiting...")
}
dlog.Debug(err)
time.Sleep(1 * time.Second)
continue
}
pc.Close()
dlog.Notice("Network connectivity detected")
return nil
}
dlog.Error("Timeout while waiting for network connectivity")
return nil
}
|
