/// <summary>
/// Get the remote IP of this machine.
/// </summary>
/// <returns>Returns the remote IP of this machine, else if there is a problem returns Null.</returns>
public static string GetRemoteIP()
{
UpnpPort port = GetInfoUpnpPort(Global.ListeningPort);
if (port != null)
{
return(port.ExternalIP);
}
else
{
int nPort = OpenRandomPort();
port = GetInfoUpnpPort(nPort);
ClosePort(nPort, Protocol.TCP);
if (port != null)
{
return(port.ExternalIP);
}
else
{
return(null);
}
}
}
/// <summary>
/// Gets info about a UPnP port.
/// </summary>
/// <param name="PortNumber">The number of the port to get info.</param>
/// <returns>The info about the UPnP port. Return null if is the UPnP port is not exist.</returns>
public static UpnpPort GetInfoUpnpPort(int PortNumber)
{
NATUPNPLib.UPnPNATClass upnpnat = new NATUPNPLib.UPnPNATClass();
NATUPNPLib.IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
if (mappings != null)
{
foreach(NATUPNPLib.IStaticPortMapping portMapping in mappings)
{
if (portMapping.ExternalPort == PortNumber)
{
UpnpPort port = new UpnpPort();
port.Description = portMapping.Description;
port.Enabled = portMapping.Enabled;
port.InternalIP = portMapping.InternalClient;
port.ExternalIP = portMapping.ExternalIPAddress;
port.Port = portMapping.ExternalPort;
port.Protocol = (Protocol)Enum.Parse(typeof(Protocol), portMapping.Protocol, true);
return port;
}
}
}
return null;
}
/// <summary>
/// Gets info about a UPnP port.
/// </summary>
/// <param name="PortNumber">The number of the port to get info.</param>
/// <returns>The info about the UPnP port. Return null if is the UPnP port is not exist.</returns>
public static UpnpPort GetInfoUpnpPort(int PortNumber)
{
NATUPNPLib.UPnPNATClass upnpnat = new NATUPNPLib.UPnPNATClass();
NATUPNPLib.IStaticPortMappingCollection mappings = upnpnat.StaticPortMappingCollection;
if (mappings != null)
{
foreach (NATUPNPLib.IStaticPortMapping portMapping in mappings)
{
if (portMapping.ExternalPort == PortNumber)
{
UpnpPort port = new UpnpPort();
port.Description = portMapping.Description;
port.Enabled = portMapping.Enabled;
port.InternalIP = portMapping.InternalClient;
port.ExternalIP = portMapping.ExternalIPAddress;
port.Port = portMapping.ExternalPort;
port.Protocol = (Protocol)Enum.Parse(typeof(Protocol), portMapping.Protocol, true);
return(port);
}
}
}
return(null);
}
