///<summary>Starts listening on the selected IP address and port.</summary>
///<exception cref="SocketException">There was an error while creating the listening socket.</exception>
public void Start()
{
try {
ListenSocket = new SecureSocket(Address.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ListenSocket.Bind(new IPEndPoint(Address, Port));
ListenSocket.Listen(50);
ListenSocket.BeginAccept(new AsyncCallback(this.OnAccept), ListenSocket);
} catch {
ListenSocket = null;
throw new SocketException();
}
}
///<summary>Called when we're connected to the data port of the remote FTP server.</summary>
///<param name="ar">The result of the asynchronous operation.</param>
private void OnPasvConnected(IAsyncResult ar)
{
try {
DestinationSocket.EndConnect(ar);
ListenSocket = new SecureSocket(IPAddress.Any.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ListenSocket.Bind(new IPEndPoint(IPAddress.Any, 0));
ListenSocket.Listen(1);
ListenSocket.BeginAccept(new AsyncCallback(this.OnPasvAccept), ListenSocket);
Parent.SendCommand("227 Entering Passive Mode (" + Listener.GetLocalInternalIP().ToString().Replace('.', ',') + "," + Math.Floor(((IPEndPoint)ListenSocket.LocalEndPoint).Port / 256).ToString() + "," + (((IPEndPoint)ListenSocket.LocalEndPoint).Port % 256).ToString() + ").\r\n");
} catch {
Dispose();
}
}
///<summary>Initializes a new instance of the FtpDataConnection class.</summary>
///<param name="RemoteAddress">The address on the local FTP client to connect to.</param>
///<returns>The PORT command string to send to the FTP server.</returns>
public string ProcessPort(IPEndPoint RemoteAddress)
{
try {
ListenSocket = new SecureSocket(IPAddress.Any.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ListenSocket.Bind(new IPEndPoint(IPAddress.Any, 0));
ListenSocket.Listen(1);
ListenSocket.BeginAccept(new AsyncCallback(this.OnPortAccept), ListenSocket);
ClientSocket = new SecureSocket(RemoteAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ClientSocket.BeginConnect(RemoteAddress, new AsyncCallback(this.OnPortConnected), ClientSocket);
return("PORT " + Listener.GetLocalExternalIP().ToString().Replace('.', ',') + "," + Math.Floor(((IPEndPoint)ListenSocket.LocalEndPoint).Port / 256).ToString() + "," + (((IPEndPoint)ListenSocket.LocalEndPoint).Port % 256).ToString() + "\r\n");
} catch {
Dispose();
return("PORT 0,0,0,0,0,0\r\n");
}
}
public void BeginAccept(AsyncCallback callback,
object state)
{
fAcceptSocket.BeginAccept(callback, state);
}
