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using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Security;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Rssdp.Infrastructure;
namespace Rssdp
{
// 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.
internal sealed class UdpSocket : DisposableManagedObjectBase, IUdpSocket
{
#region Fields
private System.Net.Sockets.Socket _Socket;
private int _LocalPort;
#endregion
#region Constructors
public UdpSocket(System.Net.Sockets.Socket socket, int localPort, string ipAddress)
{
if (socket == null) throw new ArgumentNullException("socket");
_Socket = socket;
_LocalPort = localPort;
IPAddress ip = null;
if (String.IsNullOrEmpty(ipAddress))
ip = IPAddress.Any;
else
ip = IPAddress.Parse(ipAddress);
_Socket.Bind(new IPEndPoint(ip, _LocalPort));
if (_LocalPort == 0)
_LocalPort = (_Socket.LocalEndPoint as IPEndPoint).Port;
}
#endregion
#region IUdpSocket Members
public System.Threading.Tasks.Task<ReceivedUdpData> ReceiveAsync()
{
ThrowIfDisposed();
var tcs = new TaskCompletionSource<ReceivedUdpData>();
System.Net.EndPoint receivedFromEndPoint = new IPEndPoint(IPAddress.Any, 0);
var state = new AsyncReceiveState(_Socket, receivedFromEndPoint);
state.TaskCompletionSource = tcs;
#if NETSTANDARD1_6
_Socket.ReceiveFromAsync(new System.ArraySegment<Byte>(state.Buffer), System.Net.Sockets.SocketFlags.None, state.EndPoint)
.ContinueWith((task, asyncState) =>
{
if (task.Status != TaskStatus.Faulted)
{
var receiveState = asyncState as AsyncReceiveState;
receiveState.EndPoint = task.Result.RemoteEndPoint;
ProcessResponse(receiveState, () => task.Result.ReceivedBytes);
}
}, state);
#else
_Socket.BeginReceiveFrom(state.Buffer, 0, state.Buffer.Length, System.Net.Sockets.SocketFlags.None, ref state.EndPoint, new AsyncCallback(this.ProcessResponse), state);
#endif
return tcs.Task;
}
public Task SendTo(byte[] messageData, UdpEndPoint endPoint)
{
ThrowIfDisposed();
if (messageData == null) throw new ArgumentNullException("messageData");
if (endPoint == null) throw new ArgumentNullException("endPoint");
#if NETSTANDARD1_6
_Socket.SendTo(messageData, new System.Net.IPEndPoint(IPAddress.Parse(endPoint.IPAddress), endPoint.Port));
return Task.FromResult(true);
#else
var taskSource = new TaskCompletionSource<bool>();
try
{
_Socket.BeginSendTo(messageData, 0, messageData.Length, SocketFlags.None, new System.Net.IPEndPoint(IPAddress.Parse(endPoint.IPAddress), endPoint.Port), result =>
{
try
{
_Socket.EndSend(result);
taskSource.TrySetResult(true);
}
catch (SocketException ex)
{
taskSource.TrySetException(ex);
}
catch (ObjectDisposedException ex)
{
taskSource.TrySetException(ex);
}
catch (InvalidOperationException ex)
{
taskSource.TrySetException(ex);
}
catch (SecurityException ex)
{
taskSource.TrySetException(ex);
}
}, null);
}
catch (SocketException ex)
{
taskSource.TrySetException(ex);
}
catch (ObjectDisposedException ex)
{
taskSource.TrySetException(ex);
}
catch (SecurityException ex)
{
taskSource.TrySetException(ex);
}
//_Socket.SendTo(messageData, new System.Net.IPEndPoint(IPAddress.Parse(endPoint.IPAddress), endPoint.Port));
return taskSource.Task;
#endif
}
#endregion
#region Overrides
protected override void Dispose(bool disposing)
{
if (disposing)
{
var socket = _Socket;
if (socket != null)
socket.Dispose();
}
}
#endregion
#region Private Methods
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exceptions via task methods should be reported by task completion source, so this should be ok.")]
private static void ProcessResponse(AsyncReceiveState state, Func<int> receiveData)
{
try
{
var bytesRead = receiveData();
var ipEndPoint = state.EndPoint as IPEndPoint;
state.TaskCompletionSource.SetResult(
new ReceivedUdpData()
{
Buffer = state.Buffer,
ReceivedBytes = bytesRead,
ReceivedFrom = new UdpEndPoint()
{
IPAddress = ipEndPoint.Address.ToString(),
Port = ipEndPoint.Port
}
}
);
}
catch (ObjectDisposedException)
{
state.TaskCompletionSource.SetCanceled();
}
catch (SocketException se)
{
if (se.SocketErrorCode != SocketError.Interrupted && se.SocketErrorCode != SocketError.OperationAborted && se.SocketErrorCode != SocketError.Shutdown)
state.TaskCompletionSource.SetException(se);
else
state.TaskCompletionSource.SetCanceled();
}
catch (Exception ex)
{
state.TaskCompletionSource.SetException(ex);
}
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes", Justification = "Exceptions via task methods should be reported by task completion source, so this should be ok.")]
private void ProcessResponse(IAsyncResult asyncResult)
{
#if NET46
var state = asyncResult.AsyncState as AsyncReceiveState;
try
{
var bytesRead = state.Socket.EndReceiveFrom(asyncResult, ref state.EndPoint);
var ipEndPoint = state.EndPoint as IPEndPoint;
state.TaskCompletionSource.SetResult(
new ReceivedUdpData()
{
Buffer = state.Buffer,
ReceivedBytes = bytesRead,
ReceivedFrom = new UdpEndPoint()
{
IPAddress = ipEndPoint.Address.ToString(),
Port = ipEndPoint.Port
}
}
);
}
catch (ObjectDisposedException)
{
state.TaskCompletionSource.SetCanceled();
}
catch (SocketException se)
{
if (se.SocketErrorCode != SocketError.Interrupted && se.SocketErrorCode != SocketError.OperationAborted && se.SocketErrorCode != SocketError.Shutdown)
state.TaskCompletionSource.SetException(se);
else
state.TaskCompletionSource.SetCanceled();
}
catch (Exception ex)
{
state.TaskCompletionSource.SetException(ex);
}
#endif
}
#endregion
#region Private Classes
private class AsyncReceiveState
{
public AsyncReceiveState(System.Net.Sockets.Socket socket, EndPoint endPoint)
{
this.Socket = socket;
this.EndPoint = endPoint;
}
public EndPoint EndPoint;
public byte[] Buffer = new byte[SsdpConstants.DefaultUdpSocketBufferSize];
public System.Net.Sockets.Socket Socket { get; private set; }
public TaskCompletionSource<ReceivedUdpData> TaskCompletionSource { get; set; }
}
#endregion
}
}
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