1 files changed, 255 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/Net/UdpSocket.cs b/Emby.Server.Implementations/Net/UdpSocket.cs
new file mode 100644
index 000000000..58e4d6f89
--- /dev/null
+++ b/Emby.Server.Implementations/Net/UdpSocket.cs
@@ -0,0 +1,255 @@
+using System;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading;
+using System.Threading.Tasks;
+using Emby.Server.Implementations.Networking;
+using MediaBrowser.Model.Net;
+
+namespace Emby.Server.Implementations.Net
+{
+    // THIS IS A LINKED FILE - SHARED AMONGST MULTIPLE PLATFORMS	
+    // Be careful to check any changes compile and work for all platform projects it is shared in.
+
+    public sealed class UdpSocket : DisposableManagedObjectBase, ISocket
+    {
+        private Socket _Socket;
+        private int _LocalPort;
+
+        public Socket Socket
+        {
+            get { return _Socket; }
+        }
+
+        private readonly SocketAsyncEventArgs _receiveSocketAsyncEventArgs = new SocketAsyncEventArgs()
+        {
+            SocketFlags = SocketFlags.None
+        };
+
+        private readonly SocketAsyncEventArgs _sendSocketAsyncEventArgs = new SocketAsyncEventArgs()
+        {
+            SocketFlags = SocketFlags.None
+        };
+
+        private TaskCompletionSource<SocketReceiveResult> _currentReceiveTaskCompletionSource;
+        private TaskCompletionSource<int> _currentSendTaskCompletionSource;
+
+        public UdpSocket(Socket socket, int localPort, IPAddress ip)
+        {
+            if (socket == null) throw new ArgumentNullException("socket");
+
+            _Socket = socket;
+            _LocalPort = localPort;
+            LocalIPAddress = NetworkManager.ToIpAddressInfo(ip);
+
+            _Socket.Bind(new IPEndPoint(ip, _LocalPort));
+
+            InitReceiveSocketAsyncEventArgs();
+        }
+
+        private void InitReceiveSocketAsyncEventArgs()
+        {
+            var receiveBuffer = new byte[8192];
+            _receiveSocketAsyncEventArgs.SetBuffer(receiveBuffer, 0, receiveBuffer.Length);
+            _receiveSocketAsyncEventArgs.Completed += _receiveSocketAsyncEventArgs_Completed;
+
+            var sendBuffer = new byte[8192];
+            _sendSocketAsyncEventArgs.SetBuffer(sendBuffer, 0, sendBuffer.Length);
+            _sendSocketAsyncEventArgs.Completed += _sendSocketAsyncEventArgs_Completed;
+        }
+
+        private void _receiveSocketAsyncEventArgs_Completed(object sender, SocketAsyncEventArgs e)
+        {
+            var tcs = _currentReceiveTaskCompletionSource;
+            if (tcs != null)
+            {
+                _currentReceiveTaskCompletionSource = null;
+
+                if (e.SocketError == SocketError.Success)
+                {
+                    tcs.TrySetResult(new SocketReceiveResult
+                    {
+                        Buffer = e.Buffer,
+                        ReceivedBytes = e.BytesTransferred,
+                        RemoteEndPoint = ToIpEndPointInfo(e.RemoteEndPoint as IPEndPoint),
+                        LocalIPAddress = LocalIPAddress
+                    });
+                }
+                else
+                {
+                    tcs.TrySetException(new Exception("SocketError: " + e.SocketError));
+                }
+            }
+        }
+
+        private void _sendSocketAsyncEventArgs_Completed(object sender, SocketAsyncEventArgs e)
+        {
+            var tcs = _currentSendTaskCompletionSource;
+            if (tcs != null)
+            {
+                _currentSendTaskCompletionSource = null;
+
+                if (e.SocketError == SocketError.Success)
+                {
+                    tcs.TrySetResult(e.BytesTransferred);
+                }
+                else
+                {
+                    tcs.TrySetException(new Exception("SocketError: " + e.SocketError));
+                }
+            }
+        }
+
+        public UdpSocket(Socket socket, IpEndPointInfo endPoint)
+        {
+            if (socket == null) throw new ArgumentNullException("socket");
+
+            _Socket = socket;
+            _Socket.Connect(NetworkManager.ToIPEndPoint(endPoint));
+
+            InitReceiveSocketAsyncEventArgs();
+        }
+
+        public IpAddressInfo LocalIPAddress
+        {
+            get;
+            private set;
+        }
+
+        public IAsyncResult BeginReceive(byte[] buffer, int offset, int count, AsyncCallback callback)
+        {
+            EndPoint receivedFromEndPoint = new IPEndPoint(IPAddress.Any, 0);
+
+            return _Socket.BeginReceiveFrom(buffer, offset, count, SocketFlags.None, ref receivedFromEndPoint, callback, buffer);
+        }
+
+        public int Receive(byte[] buffer, int offset, int count)
+        {
+            return _Socket.Receive(buffer, 0, buffer.Length, SocketFlags.None);
+        }
+
+        public SocketReceiveResult EndReceive(IAsyncResult result)
+        {
+            IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
+            EndPoint remoteEndPoint = (EndPoint)sender;
+
+            var receivedBytes = _Socket.EndReceiveFrom(result, ref remoteEndPoint);
+
+            var buffer = (byte[]) result.AsyncState;
+
+            return new SocketReceiveResult
+            {
+                ReceivedBytes = receivedBytes,
+                RemoteEndPoint = ToIpEndPointInfo((IPEndPoint)remoteEndPoint),
+                Buffer = buffer,
+                LocalIPAddress = LocalIPAddress
+            };
+        }
+
+        public Task<SocketReceiveResult> ReceiveAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        {
+            var taskCompletion = new TaskCompletionSource<SocketReceiveResult>();
+
+            Action<IAsyncResult> callback = callbackResult =>
+            {
+                try
+                {
+                    taskCompletion.TrySetResult(EndReceive(callbackResult));
+                }
+                catch (Exception ex)
+                {
+                    taskCompletion.TrySetException(ex);
+                }
+            };
+
+            var result = BeginReceive(buffer, offset, count, new AsyncCallback(callback));
+
+            if (result.CompletedSynchronously)
+            {
+                callback(result);
+            }
+
+            cancellationToken.Register(() => taskCompletion.TrySetCanceled());
+
+            return taskCompletion.Task;
+        }
+
+        public Task<SocketReceiveResult> ReceiveAsync(CancellationToken cancellationToken)
+        {
+            var buffer = new byte[8192];
+
+            return ReceiveAsync(buffer, 0, buffer.Length, cancellationToken);
+        }
+
+        public Task SendToAsync(byte[] buffer, int offset, int size, IpEndPointInfo endPoint, CancellationToken cancellationToken)
+        {
+            var taskCompletion = new TaskCompletionSource<int>();
+
+            Action<IAsyncResult> callback = callbackResult =>
+            {
+                try
+                {
+                    taskCompletion.TrySetResult(EndSendTo(callbackResult));
+                }
+                catch (Exception ex)
+                {
+                    taskCompletion.TrySetException(ex);
+                }
+            };
+
+            var result = BeginSendTo(buffer, offset, size, endPoint, new AsyncCallback(callback), null);
+
+            if (result.CompletedSynchronously)
+            {
+                callback(result);
+            }
+
+            cancellationToken.Register(() => taskCompletion.TrySetCanceled());
+
+            return taskCompletion.Task;
+        }
+
+        public IAsyncResult BeginSendTo(byte[] buffer, int offset, int size, IpEndPointInfo endPoint, AsyncCallback callback, object state)
+        {
+            var ipEndPoint = NetworkManager.ToIPEndPoint(endPoint);
+
+            return _Socket.BeginSendTo(buffer, offset, size, SocketFlags.None, ipEndPoint, callback, state);
+        }
+
+        public int EndSendTo(IAsyncResult result)
+        {
+            return _Socket.EndSendTo(result);
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                var socket = _Socket;
+                if (socket != null)
+                    socket.Dispose();
+
+                var tcs = _currentReceiveTaskCompletionSource;
+                if (tcs != null)
+                {
+                    tcs.TrySetCanceled();
+                }
+                var sendTcs = _currentSendTaskCompletionSource;
+                if (sendTcs != null)
+                {
+                    sendTcs.TrySetCanceled();
+                }
+            }
+        }
+
+        private static IpEndPointInfo ToIpEndPointInfo(IPEndPoint endpoint)
+        {
+            if (endpoint == null)
+            {
+                return null;
+            }
+
+            return NetworkManager.ToIpEndPointInfo(endpoint);
+        }
+    }
+}