private string AppendOperation(NetworkStream dataStream, string pathname)
{
long bytes = 0;
using (FileStream fs = new FileStream(pathname, FileMode.Append, FileAccess.Write, FileShare.None, 4096, FileOptions.SequentialScan))
{
bytes = CopyStream(dataStream, fs);
}
LogEntry logEntry = new LogEntry
{
Date = DateTime.Now,
CIP = _clientIP,
CSMethod = "APPE",
CSUsername = _username,
SCStatus = "226",
CSBytes = bytes.ToString()
};
_log.Info(logEntry);
return "226 Closing data connection, file transfer successful";
}
private string ListOperation(NetworkStream dataStream, string pathname)
{
StreamWriter dataWriter = new StreamWriter(dataStream, Encoding.ASCII);
IEnumerable<string> directories = Directory.EnumerateDirectories(pathname);
foreach (string dir in directories)
{
DirectoryInfo d = new DirectoryInfo(dir);
string date = d.LastWriteTime < DateTime.Now - TimeSpan.FromDays(180) ?
d.LastWriteTime.ToString("MMM dd yyyy") :
d.LastWriteTime.ToString("MMM dd HH:mm");
string line = string.Format("drwxr-xr-x 2 2003 2003 {0,8} {1} {2}", "4096", date, d.Name);
dataWriter.WriteLine(line);
dataWriter.Flush();
}
IEnumerable<string> files = Directory.EnumerateFiles(pathname);
foreach (string file in files)
{
FileInfo f = new FileInfo(file);
string date = f.LastWriteTime < DateTime.Now - TimeSpan.FromDays(180) ?
f.LastWriteTime.ToString("MMM dd yyyy") :
f.LastWriteTime.ToString("MMM dd HH:mm");
string line = string.Format("-rw-r--r-- 2 2003 2003 {0,8} {1} {2}", f.Length, date, f.Name);
dataWriter.WriteLine(line);
dataWriter.Flush();
}
LogEntry logEntry = new LogEntry
{
Date = DateTime.Now,
CIP = _clientIP,
CSMethod = "LIST",
CSUsername = _username,
SCStatus = "226"
};
_log.Info(logEntry);
return "226 Transfer complete";
}
public void HandleClient(object obj)
{
_remoteEndPoint = (IPEndPoint)_controlClient.Client.RemoteEndPoint;
_clientIP = _remoteEndPoint.Address.ToString();
_controlStream = _controlClient.GetStream();
_controlReader = new StreamReader(_controlStream);
_controlWriter = new StreamWriter(_controlStream);
_controlWriter.WriteLine("220 Service Ready.");
_controlWriter.Flush();
_validCommands.AddRange(new string[] { "AUTH", "USER", "PASS", "QUIT", "HELP", "NOOP" });
string line;
_dataClient = new TcpClient();
string renameFrom = null;
try
{
while ((line = _controlReader.ReadLine()) != null)
{
string response = null;
string[] command = line.Split(' ');
string cmd = command[0].ToUpperInvariant();
string arguments = command.Length > 1 ? line.Substring(command[0].Length + 1) : null;
if (arguments != null && arguments.Trim().Length == 0)
{
arguments = null;
}
LogEntry logEntry = new LogEntry
{
Date = DateTime.Now,
CIP = _clientIP,
CSUriStem = arguments
};
if (!_validCommands.Contains(cmd))
{
response = CheckUser();
}
if (cmd != "RNTO")
{
renameFrom = null;
}
if (response == null)
{
switch (cmd)
{
case "USER":
response = User(arguments);
break;
case "PASS":
response = Password(arguments);
logEntry.CSUriStem = "******";
break;
case "CWD":
response = ChangeWorkingDirectory(arguments);
break;
case "CDUP":
response = ChangeWorkingDirectory("..");
break;
case "QUIT":
response = "221 Service closing control connection";
break;
case "REIN":
_currentUser = null;
_username = null;
_passiveListener = null;
_dataClient = null;
response = "220 Service ready for new user";
break;
case "PORT":
response = Port(arguments);
logEntry.CPort = _dataEndpoint.Port.ToString();
break;
case "PASV":
response = Passive();
logEntry.SPort = ((IPEndPoint)_passiveListener.LocalEndpoint).Port.ToString();
break;
case "TYPE":
response = Type(command[1], command.Length == 3 ? command[2] : null);
logEntry.CSUriStem = command[1];
break;
case "STRU":
response = Structure(arguments);
break;
case "MODE":
response = Mode(arguments);
break;
case "RNFR":
renameFrom = arguments;
response = "350 Requested file action pending further information";
break;
case "RNTO":
response = Rename(renameFrom, arguments);
break;
case "DELE":
response = Delete(arguments);
break;
case "RMD":
response = RemoveDir(arguments);
break;
case "MKD":
response = CreateDir(arguments);
break;
case "PWD":
response = PrintWorkingDirectory();
break;
case "RETR":
response = Retrieve(arguments);
logEntry.Date = DateTime.Now;
break;
case "STOR":
response = Store(arguments);
logEntry.Date = DateTime.Now;
break;
case "STOU":
response = StoreUnique();
logEntry.Date = DateTime.Now;
break;
case "APPE":
response = Append(arguments);
logEntry.Date = DateTime.Now;
break;
case "LIST":
response = List(arguments ?? _currentDirectory);
logEntry.Date = DateTime.Now;
break;
case "SYST":
response = "215 UNIX Type: L8";
break;
case "NOOP":
response = "200 OK";
break;
case "ACCT":
response = "200 OK";
break;
case "ALLO":
response = "200 OK";
break;
case "NLST":
response = "502 Command not implemented";
break;
case "SITE":
response = "502 Command not implemented";
break;
case "STAT":
response = "502 Command not implemented";
break;
case "HELP":
response = "502 Command not implemented";
break;
case "SMNT":
response = "502 Command not implemented";
break;
case "REST":
response = "502 Command not implemented";
break;
case "ABOR":
response = "502 Command not implemented";
break;
// Extensions defined by rfc 2228
case "AUTH":
response = Auth(arguments);
break;
// Extensions defined by rfc 2389
case "FEAT":
response = FeatureList();
break;
case "OPTS":
response = Options(arguments);
break;
// Extensions defined by rfc 3659
case "MDTM":
response = FileModificationTime(arguments);
break;
case "SIZE":
response = FileSize(arguments);
break;
// Extensions defined by rfc 2428
case "EPRT":
response = EPort(arguments);
logEntry.CPort = _dataEndpoint.Port.ToString();
break;
case "EPSV":
response = EPassive();
logEntry.SPort = ((IPEndPoint)_passiveListener.LocalEndpoint).Port.ToString();
break;
default:
response = "502 Command not implemented";
break;
}
}
logEntry.CSMethod = cmd;
logEntry.CSUsername = _username;
logEntry.SCStatus = response.Substring(0, response.IndexOf(' '));
_log.Info(logEntry);
if (_controlClient == null || !_controlClient.Connected)
{
break;
}
else
{
_controlWriter.WriteLine(response);
_controlWriter.Flush();
if (response.StartsWith("221"))
{
break;
}
if (cmd == "AUTH")
{
_cert = new X509Certificate("server.cer");
_sslStream = new SslStream(_controlStream);
_sslStream.AuthenticateAsServer(_cert);
_controlReader = new StreamReader(_sslStream);
_controlWriter = new StreamWriter(_sslStream);
}
}
}
}
catch (Exception ex)
{
_log.Error(ex.Message);
}
Dispose();
}
