func setupUPnP(r rand.Source) int {
var externalPort = 0
if len(cfg.Options.ListenAddress) == 1 {
_, portStr, err := net.SplitHostPort(cfg.Options.ListenAddress[0])
if err != nil {
l.Warnln(err)
} else {
// Set up incoming port forwarding, if necessary and possible
port, _ := strconv.Atoi(portStr)
igd, err := upnp.Discover()
if err == nil {
for i := 0; i < 10; i++ {
r := 1024 + int(r.Int63()%(65535-1024))
err := igd.AddPortMapping(upnp.TCP, r, port, "syncthing", 0)
if err == nil {
externalPort = r
l.Infoln("Created UPnP port mapping - external port", externalPort)
break
}
}
if externalPort == 0 {
l.Warnln("Failed to create UPnP port mapping")
}
} else {
l.Infof("No UPnP gateway detected")
if debugNet {
l.Debugf("UPnP: %v", err)
}
}
}
} else {
l.Warnln("Multiple listening addresses; not attempting UPnP port mapping")
}
return externalPort
}
func setupUPnP() int {
var externalPort = 0
if len(cfg.Options.ListenAddress) == 1 {
_, portStr, err := net.SplitHostPort(cfg.Options.ListenAddress[0])
if err != nil {
warnln(err)
} else {
// Set up incoming port forwarding, if necessary and possible
port, _ := strconv.Atoi(portStr)
igd, err := upnp.Discover()
if err == nil {
for i := 0; i < 10; i++ {
r := 1024 + rand.Intn(65535-1024)
err := igd.AddPortMapping(upnp.TCP, r, port, "syncthing", 0)
if err == nil {
externalPort = r
infoln("Created UPnP port mapping - external port", externalPort)
break
}
}
if externalPort == 0 {
warnln("Failed to create UPnP port mapping")
}
} else {
infof("No UPnP IGD device found, no port mapping created (%v)", err)
}
}
} else {
warnln("Multiple listening addresses; not attempting UPnP port mapping")
}
return externalPort
}