func setupUPnP() {
if len(cfg.Options.ListenAddress) == 1 {
_, portStr, err := net.SplitHostPort(cfg.Options.ListenAddress[0])
if err != nil {
l.Warnln("Bad listen address:", err)
} else {
// Set up incoming port forwarding, if necessary and possible
port, _ := strconv.Atoi(portStr)
igd, err := upnp.Discover()
if err == nil {
externalPort = setupExternalPort(igd, port)
if externalPort == 0 {
l.Warnln("Failed to create UPnP port mapping")
} else {
l.Infoln("Created UPnP port mapping - external port", externalPort)
}
} else {
l.Infof("No UPnP gateway detected")
if debugNet {
l.Debugf("UPnP: %v", err)
}
}
if cfg.Options.UPnPRenewal > 0 {
go renewUPnP(port)
}
}
} else {
l.Warnln("Multiple listening addresses; not attempting UPnP port mapping")
}
}
func renewUPnP(port int) {
for {
time.Sleep(time.Duration(cfg.Options.UPnPRenewal) * time.Minute)
igd, err := upnp.Discover()
if err != nil {
continue
}
// Just renew the same port that we already have
err = igd.AddPortMapping(upnp.TCP, externalPort, port, "syncthing", cfg.Options.UPnPLease*60)
if err == nil {
l.Infoln("Renewed UPnP port mapping - external port", externalPort)
continue
}
// Something strange has happened. Perhaps the gateway has changed?
// Retry the same port sequence from the beginning.
r := setupExternalPort(igd, port)
if r != 0 {
externalPort = r
l.Infoln("Updated UPnP port mapping - external port", externalPort)
discoverer.StopGlobal()
discoverer.StartGlobal(cfg.Options.GlobalAnnServer, uint16(r))
continue
}
l.Warnln("Failed to update UPnP port mapping - external port", externalPort)
}
}
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("Bad listen address:", 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
}
