func setupExternalPort(igd *upnp.IGD, port int) int {
// We seed the random number generator with the device ID to get a
// repeatable sequence of random external ports.
rnd := rand.NewSource(certSeed(cert.Certificate[0]))
for i := 0; i < 10; i++ {
r := 1024 + int(rnd.Int63()%(65535-1024))
err := igd.AddPortMapping(upnp.TCP, r, port, "syncthing", cfg.Options().UPnPLease*60)
if err == nil {
return r
}
}
return 0
}
func setupExternalPort(igd *upnp.IGD, port int) int {
if igd == nil {
return 0
}
for i := 0; i < 10; i++ {
r := 1024 + predictableRandom.Intn(65535-1024)
err := igd.AddPortMapping(upnp.TCP, r, port, fmt.Sprintf("syncthing-%d", r), cfg.Options().UPnPLease*60)
if err == nil {
return r
}
}
return 0
}