protected override async Task HandleMessageReceived(IPAddress localAddress, byte[] response, IPEndPoint remoteEndPoint, bool externalEvent, CancellationToken token)
{
if (token == CancellationToken.None)
{
token = Cancellation.Token;
}
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);
Log.InfoFormatted("uPnP Search Response: {0}", dataString);
/* For UPnP Port Mapping we need ot find either WANPPPConnection or WANIPConnection.
* Any other device type is no good to us for this purpose. See the IGP overview paper
* page 5 for an overview of device types and their hierarchy.
* http://upnp.org/specs/gw/UPnP-gw-InternetGatewayDevice-v1-Device.pdf */
/* TODO: Currently we are assuming version 1 of the protocol. We should figure out which
* version it is and apply the correct URN. */
string foundService = null;
foreach (var type in SupportedServices.Concat(DiscoverDeviceMessage.SupportedServiceTypes))
{
if (dataString.IndexOf(type, StringComparison.OrdinalIgnoreCase) != -1)
{
foundService = type;
break;
}
}
if (foundService == null && !externalEvent)
{
RaiseDeviceUnknown(localAddress, remoteEndPoint, dataString, NatProtocol.Upnp);
return;
}
Log.InfoFormatted("uPnP Search Response: Router advertised a '{0}' service", foundService);
var location = dataString.Split(new[] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries)
.Select(t => t.Trim())
.FirstOrDefault(t => t.StartsWith("LOCATION", StringComparison.OrdinalIgnoreCase));
if (location == null)
{
return;
}
var deviceLocation = location.Split(new[] { ':' }, 2).Skip(1).FirstOrDefault();
var deviceServiceUri = new Uri(deviceLocation);
using (await Locker.DisposableWaitAsync(token).ConfigureAwait(false)) {
// If we send 3 requests at a time, ensure we only fetch the services list once
// even if three responses are received
if (LastFetched.TryGetValue(deviceServiceUri, out DateTime last))
{
if ((DateTime.Now - last) < TimeSpan.FromSeconds(20))
{
return;
}
}
LastFetched[deviceServiceUri] = 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.
Log.InfoFormatted("Fetching service list: {0}", deviceServiceUri);
var d = await GetServicesList(localAddress, deviceServiceUri, token).ConfigureAwait(false);
if (d != null)
{
RaiseDeviceFound(d);
}
} catch (OperationCanceledException) {
throw;
} 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);
}
}
protected override async Task HandleMessageReceived(IPAddress localAddress, UdpReceiveResult result, CancellationToken token)
{
// Convert it to a string for easy parsing
string dataString = null;
var response = result.Buffer;
// 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);
NatUtility.Log("uPnP Search Response: {0}", dataString);
/* For UPnP Port Mapping we need ot find either WANPPPConnection or WANIPConnection.
* Any other device type is no good to us for this purpose. See the IGP overview paper
* page 5 for an overview of device types and their hierarchy.
* http://upnp.org/specs/gw/UPnP-gw-InternetGatewayDevice-v1-Device.pdf */
/* TODO: Currently we are assuming version 1 of the protocol. We should figure out which
* version it is and apply the correct URN. */
/* Some routers don't correctly implement the version ID on the URN, so we only search for the type
* prefix. */
string log = "uPnP Search 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:1");
}
else if (dataString.IndexOf("urn:schemas-upnp-org:service:WANPPPConnection:", c) != -1)
{
NatUtility.Log(log, "urn:schemas-upnp-org:service:WANPPPConnection:");
}
else
{
return;
}
var location = dataString.Split(new [] { "\r\n" }, StringSplitOptions.RemoveEmptyEntries)
.Select(t => t.Trim())
.FirstOrDefault(t => t.StartsWith("LOCATION", StringComparison.OrdinalIgnoreCase));
if (location == null)
{
return;
}
var deviceLocation = location.Split(new [] { ':' }, 2).Skip(1).FirstOrDefault();
var deviceServiceUri = new Uri(deviceLocation);
using (await Locker.DisposableWaitAsync(token)) {
// If we send 3 requests at a time, ensure we only fetch the services list once
// even if three responses are received
if (LastFetched.TryGetValue(deviceServiceUri, out DateTime last))
{
if ((DateTime.Now - last) < TimeSpan.FromSeconds(20))
{
return;
}
}
LastFetched [deviceServiceUri] = 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}", deviceServiceUri);
var d = await GetServicesList(localAddress, deviceServiceUri, token).ConfigureAwait(false);
if (d != null)
{
RaiseDeviceFound(d);
}
} 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);
}
}
