// Creates a data connection using the given command socket, mode, and message from the client giving the port
public DataSocket(FTPSocket ftp, bool passive, string message)
{
if (passive)
{
// Establishes a server for the client to connect to in passive mode
listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
listener.Bind(new IPEndPoint(ftp.LocalIP, 0));
listener.Listen(1);
var local = (IPEndPoint)listener.LocalEndPoint;
var ip = local.Address.ToString().Replace('.', ',');
var port = local.Port;
ftp.Write("227 Entering Passive Mode ({0},{1},{2}).", ip, port / 256, port % 256);
}
else
{
// Connects to the clients data connection in active mode
var match = Regex.Match(message, @"(\d+,\d+,\d+,\d+),(\d+),(\d+)");
address = IPAddress.Parse(match.Groups[1].Value.Replace(',', '.'));
port = int.Parse(match.Groups[2].Value) * 256 + int.Parse(match.Groups[3].Value);
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
ftp.Write("200 PORT command successful. Consider using PASV.");
}
}
// Listens for commands from client on a loop
public void Run()
{
Console.WriteLine("New connection");
// Create a wrapped socekt for sending and receivng
using (ftp = new FTPSocket(_socket))
{
try
{
// Run until something goes wrong or the quit command is received
var stop = false;
while (!stop)
{
stop = HandleCommand();
}
}
catch
{
Console.WriteLine("Unexpect error occured");
}
}
Console.WriteLine("Connection closed");
}
