private void HandleControl(object state)
{
try
{
LogUser.Address = Client.Client.RemoteEndPoint.ToString();
LogUser.LogMsg($"220 Ready As I'll Ever Be");
ControlWriter.WriteLine("220 Ready As I'll Ever Be");
ControlWriter.Flush();
string line = null;
while (!string.IsNullOrEmpty(line = ControlReader.ReadLine()))
{
LogUser.LogMsg($"Command: {line}");
string response = null;
bool authTls = false;
string[] command = line.Split(' ');
string cmd = command[0].ToUpperInvariant();
string args = command.Length > 1 ? line.Substring(command[0].Length + 1) : null;
if (response == null)
{
switch (cmd)
{
case "USER":
if (LoggedIn)
{
response = "230 User already logged in";
break;
}
response = Login(args);
break;
case "PASS":
response = Login(args);
break;
case "AUTH":
if (args == "TLS" || args == "SSL")
{
response = "234 Enable TLS/SSL Connection";
authTls = true;
break;
}
response = $"502 Unknown Argument '{args}'";
break;
// File Commands
case "CDUP":
response = ChangeWD("..");
break;
case "CWD":
response = ChangeWD(args);
break;
case "PWD":
try
{
string cur = CurrentDir.Replace(Root, string.Empty).Replace('\\', '/');
response = cur.Length > 0 ? cur : "257 \"/\" is current directory";
}
catch
{
response = "550 PWD Failed Sucessfully";
}
break;
case "TYPE":
string[] splitArgs = args.Split(' ');
response = Type(splitArgs[0], splitArgs.Length > 1 ? splitArgs[1] : null);
break;
case "PASV":
response = Passive();
break;
case "PORT":
response = Port(args);
break;
case "LIST":
response = List(args ?? CurrentDir);
break;
case "RETR":
response = Retrieve(args);
break;
case "STOR":
response = Store(args);
break;
case "RNFR":
renameFrom = args;
response = "350 Requested file action pending further information";
break;
case "RNTO":
response = Rename(renameFrom, args);
break;
case "PBSZ":
response = $"200 PBSZ={args}";
break;
case "PROT":
response = $"200 Protection level set to {args}";
Protocol = (args == "P") ? Protocol.P : Protocol.C;
break;
case "MLSD":
response = MLSD(args);
break;
case "NLSD":
response = NLST(args);
break;
case "SIZE":
args = Helpers.NormalizeFilename(args, Root, CurrentDir);
if (!Helpers.IsValidPath(args, Root))
{
response = "550 File Not Found";
break;
}
response = (File.Exists(args)) ? $"213 {new FileInfo(args).Length}" : "550 File Not Found";
break;
case "MDTM":
args = Helpers.NormalizeFilename(args, Root, CurrentDir);
if (!Helpers.IsValidPath(args, Root))
{
response = "550 File Not Found";
break;
}
response = (File.Exists(args)) ? $"213 {new FileInfo(args).LastWriteTime:yyyyMMddHHmmss.fff}" : "550 File Not Found";
break;
case "QUIT":
response = "221 Goodbye";
break;
case "DELE":
response = Delete(args);
break;
case "RMD":
response = RemoveDir(args);
break;
case "MKD":
response = CreateDir(args);
break;
case "SYST":
response = "215 UNIX Type: L8";
break;
default:
response = $"502 Command '{line}' Not Implemented";
break;
}
try
{
LogUser.LogMsg($"Response: {response}");
ControlWriter.WriteLine(response);
ControlWriter.Flush();
}
catch { }
if (response.StartsWith("221"))
{
if (SslControlStream != null)
{
SslControlStream.Dispose();
}
Client.Close();
break;
}
if (authTls)
{
SslControlStream = new FixedSslStream(ControlStream);
SslControlStream.AuthenticateAsServer(X509, false, SslProtocols.Default, false);
ControlWriter = new StreamWriter(SslControlStream);
ControlReader = new StreamReader(SslControlStream);
}
}
}
Logger.UnregisterUser(LogUser);
}
catch (Exception e)
{
Logger.Log($"Client {Client.Client.RemoteEndPoint} disconnected due to an error ({e.Message})");
Client.Close();
Logger.UnregisterUser(LogUser);
}
}
