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FtpServer.cs
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FtpServer.cs
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/*
* PROJECT: Cosmos Operating System Development
* CONTENT: FTP Server
* PROGRAMMERS: Valentin Charbonnier <valentinbreiz@gmail.com>
*/
using System;
using System.IO;
using System.Text;
using Cosmos.System.FileSystem;
namespace Cosmos.System.Network.IPv4.TCP.FTP
{
/// <summary>
/// FTP data transfer mode.
/// </summary>
public enum TransferMode
{
/// <summary>
/// No mode set.
/// </summary>
NONE,
/// <summary>
/// Active mode.
/// </summary>
ACTV,
/// <summary>
/// Passive Mode.
/// </summary>
PASV
}
/// <summary>
/// FTPCommand class.
/// </summary>
internal class FtpCommand
{
/// <summary>
/// FTP Command Type.
/// </summary>
public string Command { get; set; }
/// <summary>
/// FTP Command Content.
/// </summary>
public string Content { get; set; }
}
/// <summary>
/// FtpServer class. Used to handle FTP client connections.
/// </summary>
public class FtpServer : IDisposable
{
/// <summary>
/// Command Manager.
/// </summary>
internal FtpCommandManager CommandManager { get; set; }
/// <summary>
/// TCP Listener used to handle new FTP client connection.
/// </summary>
internal TcpListener tcpListener;
/// <summary>
/// Is FTP server listening for new FTP clients.
/// </summary>
internal bool Listening;
/// <summary>
/// Are debug logs enabled.
/// </summary>
internal bool Debug;
/// <summary>
/// Create new instance of the <see cref="FtpServer"/> class.
/// </summary>
/// <exception cref="Exception">Thrown if directory does not exists.</exception>
/// <param name="fs">Initialized Cosmos Virtual Filesystem.</param>
/// <param name="directory">FTP Server root directory path.</param>
/// <param name="debug">Is debug logging enabled.</param>
public FtpServer(CosmosVFS fs, string directory, bool debug = false)
{
if (Directory.Exists(directory) == false)
{
throw new Exception("FTP server can't open specified directory.");
}
CommandManager = new FtpCommandManager(fs, directory);
Listening = true;
Debug = debug;
}
/// <summary>
/// Listen for new FTP clients.
/// </summary>
public void Listen()
{
while (Listening)
{
tcpListener = new TcpListener(21);
tcpListener.Start();
var client = tcpListener.AcceptTcpClient();
Log("Client : New connection from " + client.StateMachine.LocalAddress.ToString());
ReceiveNewClient(client);
}
}
/// <summary>
/// Handle new FTP client.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
private void ReceiveNewClient(TcpClient client)
{
var ftpClient = new FtpClient(client);
ftpClient.SendReply(220, "Service ready for new user.");
while (ftpClient.Control.IsConnected())
{
ReceiveRequest(ftpClient);
}
ftpClient.Control.Close();
//TODO: Support multiple FTP client connection
Close();
}
/// <summary>
/// Parse and execute FTP command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
private void ReceiveRequest(FtpClient ftpClient)
{
var ep = new EndPoint(Address.Zero, 0);
try
{
var data = Encoding.ASCII.GetString(ftpClient.Control.Receive(ref ep));
data = data.Remove(data.Length - 2, 2);
Log("Client : " + data);
var splitted = data.Split(' ');
var command = new FtpCommand();
command.Command = splitted[0];
if (splitted.Length > 1)
{
//Handle command content containing spaces
int i = data.IndexOf(" ") + 1;
command.Content = data.Substring(i);
command.Content = command.Content.Replace('/', '\\');
}
CommandManager.ProcessRequest(ftpClient, command);
}
catch (Exception ex)
{
Global.mDebugger.Send("Exception: " + ex.Message);
}
}
/// <summary>
/// Write logs to console
/// </summary>
/// <param name="str">String to write.</param>
private void Log(string str)
{
if (Debug)
{
global::System.Console.WriteLine(str);
}
}
/// <summary>
/// Close FTP server.
/// </summary>
public void Close()
{
Listening = false;
tcpListener.Stop();
}
/// <summary>
/// Dispose
/// </summary>
public void Dispose()
{
Close();
}
}
}