public void Handle(IPAddress localAddress, byte[] response, IPEndPoint endpoint)
{
// Convert it to a string for easy parsing
string dataString = null;
// No matter what, this method should never throw an exception. If something goes wrong
// we should still be in a position to handle the next reply correctly.
try
{
dataString = Encoding.UTF8.GetString(response);
if (NatUtility.Verbose)
{
NatUtility.Log("UPnP Response: {0}", dataString);
}
// If this device does not have a WANIPConnection service, then ignore it
// Technically i should be checking for WANIPConnection:1 and InternetGatewayDevice:1
// but there are some routers missing the '1'.
string log = "UPnP Response: Router advertised a '{0}' service";
StringComparison c = StringComparison.OrdinalIgnoreCase;
if (dataString.IndexOf("urn:schemas-upnp-org:service:WANIPConnection:", c) != -1)
{
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANIPConnection:");
}
else if (dataString.IndexOf("urn:schemas-upnp-org:device:InternetGatewayDevice:", c) != -1)
{
NatUtility.Log(log, "urn:schemas-upnp-org:device:InternetGatewayDevice:");
}
else if (dataString.IndexOf("urn:schemas-upnp-org:service:WANPPPConnection:", c) != -1)
{
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANPPPConnection:");
}
else
{
return;
}
// We have an internet gateway device now
UpnpNatDevice d = new UpnpNatDevice(localAddress, dataString, WanIPUrn);
if (this.devices.Contains(d))
{
// We already have found this device, so we just refresh it to let people know it's
// Still alive. If a device doesn't respond to a search, we dump it.
this.devices[this.devices.IndexOf(d)].LastSeen = DateTime.Now;
}
else
{
// If we send 3 requests at a time, ensure we only fetch the services list once
// even if three responses are received
if (lastFetched.ContainsKey(endpoint.Address))
{
DateTime last = lastFetched[endpoint.Address];
if ((DateTime.Now - last) < TimeSpan.FromSeconds(20))
{
return;
}
}
lastFetched[endpoint.Address] = DateTime.Now;
// Once we've parsed the information we need, we tell the device to retrieve it's service list
// Once we successfully receive the service list, the callback provided will be invoked.
NatUtility.Log("Fetching service list: {0}", d.HostEndPoint);
d.GetServicesList(new NatDeviceCallback(DeviceSetupComplete));
}
}
catch (Exception ex)
{
Trace.WriteLine("Unhandled exception when trying to decode a device's response Send me the following data: ");
Trace.WriteLine("ErrorMessage:");
Trace.WriteLine(ex.Message);
Trace.WriteLine("Data string:");
Trace.WriteLine(dataString);
}
}