public static SsdpDevice ParseBroadcastResponse(IPAddress endpoint, string data)
{
// parse http response header
var pairs = data
.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries)
.Skip(1)
.Select(line => line.Split(new[] { ":" }, 2, StringSplitOptions.None))
.Where(parts => parts.Length == 2)
.ToDictionary(parts => parts[0].ToLowerInvariant().Trim(), parts => parts[1].Trim());
var device = new SsdpDevice();
device.RemoteEndPoint = endpoint;
string location;
if (pairs.TryGetValue("location", out location))
{
UriBuilder uriBuilder = null;
Uri uri = null;
if (Uri.TryCreate(location, UriKind.Absolute, out uri))
{
uriBuilder = new UriBuilder(uri);
}
else
{
uriBuilder = new UriBuilder();
uriBuilder.Host = location;
uriBuilder.Scheme = "unknown";
}
device.Location = uriBuilder.Uri;
}
else
{
return(null);
}
string server;
if (pairs.TryGetValue("server", out server))
{
device.Server = server;
}
string st;
if (pairs.TryGetValue("st", out st))
{
device.ServiceType = st;
}
string usn;
if (pairs.TryGetValue("usn", out usn))
{
device.UniqueServiceName = usn;
}
return(device);
}
private async Task FetchDeviceInfo(SsdpDevice device, CancellationToken cancelToken)
{
try
{
var httpRequest = WebRequest.CreateHttp(device.Location);
httpRequest.Timeout = (int)Math.Round(_replyWait.TotalMilliseconds);
cancelToken.Register(() => { try { httpRequest.Abort(); } catch { } });
using (var response = (HttpWebResponse)(await httpRequest.GetResponseAsync()))
{
if (response.StatusCode == HttpStatusCode.OK)
{
using (var responseStream = response.GetResponseStream())
using (var responseReader = new StreamReader(responseStream, Encoding.UTF8))
{
var data = await responseReader.ReadToEndAsync();
var deviceInfo = SsdpDeviceInfo.ParseDeviceResponse(data);
device.Info = deviceInfo;
}
}
}
}
catch (ArgumentException) { }
catch (WebException) { }
catch (SocketException) { }
catch (ObjectDisposedException) { }
catch (OperationCanceledException) { }
catch (Exception ex)
{
#if DEBUG
Console.WriteLine(ex);
#endif
}
_deviceFoundCallback?.Invoke(device);
}
private async Task ReceiveServicer(UdpClient client)
{
var endpoint = SSDP_RECEIVE_ENDPOINT;
var replyWaitTask = _replyWait.TotalMilliseconds > 0 ? Task.Delay(_replyWait) : new TaskCompletionSource <object>().Task;
List <Task> fetchDeviceInfoTasks = new List <Task>();
while (!_isCancelled && !replyWaitTask.IsCompleted)
{
try
{
var receiveTask = SafeReceiveAsync(client);
var finishedTask = await Task.WhenAny(receiveTask, _cancelTask.Task, replyWaitTask);
if (finishedTask == receiveTask)
{
var asyncResult = await receiveTask;
if (asyncResult.Buffer == null)
{
continue;
}
var received = receiveTask.Result;
if (received.Buffer != null && received.Buffer.Length > 0)
{
var responseData = Encoding.ASCII.GetString(received.Buffer, 0, received.Buffer.Length);
var device = SsdpDevice.ParseBroadcastResponse(received.RemoteEndPoint.Address, responseData);
if (device != null)
{
if (_foundLocations.TryAdd(device.Location, device))
{
if (device.Location.Scheme != "unknown")
{
fetchDeviceInfoTasks.Add(FetchDeviceInfo(device, _cancelTokenSrc.Token));
}
else
{
_deviceFoundCallback?.Invoke(device);
}
}
}
}
}
else
{
ObserveUdpTaskException(receiveTask);
}
}
catch (SocketException) { }
catch (ObjectDisposedException) { }
catch (OperationCanceledException) { }
catch (Exception ex)
{
#if DEBUG
Console.WriteLine(ex);
throw ex;
#endif
}
}
if (fetchDeviceInfoTasks.Count > 0)
{
await Task.WhenAll(fetchDeviceInfoTasks);
}
}
