/// <summary>
/// Receive file from FTP data connection and write it to filesystem.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
private void DoStor(FtpClient ftpClient, FtpCommand command)
{
var ep = new EndPoint(Address.Zero, 0);
var data = ftpClient.Data.Receive(ref ep);
try
{
File.WriteAllBytes(CurrentDirectory + "\\" + command.Content, data);
}
catch
{
ftpClient.SendReply(550, "Requested action not taken.");
}
ftpClient.Data.Close();
ftpClient.SendReply(226, "Transfer complete.");
}
/// <summary>
/// Process PASV command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessPasv(FtpClient ftpClient, FtpCommand command)
{
/*
* TODO: - Fix new TCP SYN connection (https://stackoverflow.com/questions/67824462/why-does-my-ftp-client-open-multiple-control-connection)
* - Find port dynamically.
*/
ftpClient.SendReply(502, "Command not implemented.");
/*
* int port = 20;
* var address = ftpClient.Control.StateMachine.LocalAddress.ToByteArray();
*
* ftpClient.SendReply(227, $"Entering Passive Mode ({address[0]},{address[1]},{address[2]},{address[3]},{port / 256},{port % 256})");
*
* ftpClient.DataListener = new TcpListener(port);
* ftpClient.DataListener.Start();
*
* ftpClient.Mode = TransferMode.PASV;*/
}
/// <summary>
/// Process CDUP command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessCdup(FtpClient ftpClient, FtpCommand command)
{
try
{
var root = FileSystem.GetDirectory(CurrentDirectory);
if (CurrentDirectory.Length > 3)
{
CurrentDirectory = root.mParent.mFullPath;
ftpClient.SendReply(250, "Requested file action okay.");
}
else
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
catch
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
/// <summary>
/// Process PASS command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessPass(FtpClient ftpClient, FtpCommand command)
{
if (String.IsNullOrEmpty(command.Content))
{
ftpClient.SendReply(501, "Syntax error in parameters or arguments.");
return;
}
if (ftpClient.Username == "anonymous")
{
ftpClient.SendReply(530, "Login incorrect.");
}
else if (String.IsNullOrEmpty(ftpClient.Username))
{
ftpClient.SendReply(332, "Need account for login.");
}
else
{
ftpClient.Password = command.Content;
ftpClient.Connected = true;
ftpClient.SendReply(230, "User logged in, proceed.");
}
}
/// <summary>
/// Process USER command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessUser(FtpClient ftpClient, FtpCommand command)
{
if (String.IsNullOrEmpty(command.Content))
{
ftpClient.SendReply(501, "Syntax error in parameters or arguments.");
return;
}
if (command.Content == "anonymous")
{
ftpClient.Username = command.Content;
ftpClient.Connected = true;
ftpClient.SendReply(230, "User logged in, proceed.");
}
else if (String.IsNullOrEmpty(ftpClient.Username))
{
ftpClient.Username = command.Content;
ftpClient.SendReply(331, "User name okay, need password.");
}
else
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
/// <summary>
/// Process MKD command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessMkd(FtpClient ftpClient, FtpCommand command)
{
if (String.IsNullOrEmpty(command.Content))
{
ftpClient.SendReply(501, "Syntax error in parameters or arguments.");
return;
}
try
{
if (Directory.Exists(CurrentDirectory + "\\" + command.Content))
{
ftpClient.SendReply(550, "Requested action not taken.");
}
else
{
Directory.CreateDirectory(CurrentDirectory + "\\" + command.Content);
ftpClient.SendReply(200, "Command okay.");
}
}
catch
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
/// <summary>
/// Process DELE command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessDele(FtpClient ftpClient, FtpCommand command)
{
if (String.IsNullOrEmpty(command.Content))
{
ftpClient.SendReply(501, "Syntax error in parameters or arguments.");
return;
}
try
{
if (File.Exists(CurrentDirectory + "\\" + command.Content))
{
File.Delete(CurrentDirectory + "\\" + command.Content);
ftpClient.SendReply(250, "Requested file action okay, completed.");
}
else
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
catch
{
ftpClient.SendReply(550, "Requested action not taken.");
}
}
/// <summary>
/// Process QUIT command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessQuit(FtpClient ftpClient, FtpCommand command)
{
ftpClient.SendReply(221, "Service closing control connection.");
ftpClient.Control.Close();
}
/// <summary>
/// Process incoming FTP command.
/// </summary>
/// <param name="ftpClient">FTP Client.</param>
/// <param name="command">FTP Command.</param>
internal void ProcessRequest(FtpClient ftpClient, FtpCommand command)
{
if (command.Command == "USER")
{
ProcessUser(ftpClient, command);
}
else if (command.Command == "PASS")
{
ProcessPass(ftpClient, command);
}
else
{
if (ftpClient.IsConnected())
{
switch (command.Command)
{
case "CWD":
ProcessCwd(ftpClient, command);
break;
case "SYST":
ftpClient.SendReply(215, "CosmosOS");
break;
case "CDUP":
ProcessCdup(ftpClient, command);
break;
case "QUIT":
ProcessQuit(ftpClient, command);
break;
case "DELE":
ProcessDele(ftpClient, command);
break;
case "PWD":
ProcessPwd(ftpClient, command);
break;
case "PASV":
ProcessPasv(ftpClient, command);
break;
case "PORT":
ProcessPort(ftpClient, command);
break;
case "HELP":
ftpClient.SendReply(200, "Help done.");
break;
case "NOOP":
ftpClient.SendReply(200, "Command okay.");
break;
case "RETR":
ProcessRetr(ftpClient, command);
break;
case "STOR":
ProcessStor(ftpClient, command);
break;
case "RMD":
ProcessRmd(ftpClient, command);
break;
case "MKD":
ProcessMkd(ftpClient, command);
break;
case "LIST":
ProcessList(ftpClient, command);
break;
case "TYPE":
ftpClient.SendReply(200, "Command okay.");
break;
default:
ftpClient.SendReply(500, "Unknown command.");
break;
}
}
}
}