public void Process(Byte[] abData)
{
string sMessage = this.Encoding.GetString(abData);
sMessage = sMessage.Substring(0, sMessage.IndexOf('\r'));
FtpServerMessageHandler.SendMessage(Id, sMessage);
string sCommand;
string sValue;
int nSpaceIndex = sMessage.IndexOf(' ');
if (nSpaceIndex < 0)
{
sCommand = sMessage.ToUpper();
sValue = "";
}
else
{
sCommand = sMessage.Substring(0, nSpaceIndex).ToUpper();
sValue = sMessage.Substring(sCommand.Length + 1);
}
// check whether the client has logged in
if (!isLogged)
{
if (!((sCommand == "USER") || (sCommand == "PASS") || (sCommand == "HELP") || (sCommand == "FEAT") || (sCommand == "QUIT")))
{
SocketHelpers.Send(Socket, "530 Not logged in\r\n", this.Encoding);
return;
}
}
// check if data connection will be used
if ((sCommand == "APPE") || (sCommand == "MLSD") || (sCommand == "LIST") || (sCommand == "RETR") || (sCommand == "STOR"))
{
m_useDataSocket = true;
}
var handler = m_theCommandHashTable[sCommand] as FtpCommandHandler;
if (handler == null)
{
FtpServerMessageHandler.SendMessage(Id, string.Format("\"{0}\" : Unknown command", sCommand));
SocketHelpers.Send(Socket, "550 Unknown command\r\n", this.Encoding);
}
else
{
handler.Process(sValue);
}
// reset
m_useDataSocket = false;
}
private static TcpClient OpenSocket(FtpConnectionObject connectionObject)
{
switch (connectionObject.DataConnectionType)
{
case DataConnectionType.Active:
return(SocketHelpers.CreateTcpClient(connectionObject.PortCommandSocketAddress,
connectionObject.PortCommandSocketPort));
case DataConnectionType.Passive:
return(connectionObject.PassiveSocket);
default:
FtpServerMessageHandler.SendMessage(connectionObject.Id, "Invalid connection type!");
return(null);
}
}
private void ThreadMonitor()
{
while (m_theThread.IsAlive)
{
DateTime currentTime = DateTime.Now;
TimeSpan timeSpan = currentTime - m_lastActiveTime;
// has been idle for a long time
if ((timeSpan.TotalSeconds > m_maxIdleSeconds) && !m_theCommands.DataSocketOpen)
{
SocketHelpers.Send(m_theSocket, string.Format("426 No operations for {0}+ seconds. Bye!", m_maxIdleSeconds), m_theCommands.Encoding);
FtpServerMessageHandler.SendMessage(m_nId, "Connection closed for too long idle time.");
if (Closed != null)
{
Closed(this);
}
m_theSocket.Close();
this.Stop();
return;
}
Thread.Sleep(1000 * m_maxIdleSeconds);
}
return; // only monitor the work thread
}
/// <summary>
/// The main thread of the ftp server
/// Listen and acception clients, create handler threads for each client
/// </summary>
private void ThreadRun()
{
FtpServerMessageHandler.Message += TraceMessage;
// listen at the port by the "FTP" endpoint setting
var ipEndPoint = new System.Net.IPEndPoint(System.Net.IPAddress.Any, 21);
m_socketListen = SocketHelpers.CreateTcpListener(ipEndPoint);
if (m_socketListen != null)
{
Console.WriteLine("Information: FTP Server listened at: " + ipEndPoint);
m_socketListen.Start();
Console.WriteLine("Information: FTP Server Started");
bool fContinue = true;
while (fContinue)
{
TcpClient socket = null;
try
{
socket = m_socketListen.AcceptTcpClient();
}
catch (SocketException)
{
fContinue = false;
}
finally
{
if (socket == null)
{
fContinue = false;
}
else if (m_apConnections.Count >= m_maxClients)
{
Console.WriteLine(
"Warning: Too many clients, won't handle this connection");
SendRejectMessage(socket);
socket.Close();
}
else
{
socket.NoDelay = false;
m_nId++;
FtpServerMessageHandler.SendMessage(m_nId, "New connection");
SendAcceptMessage(socket);
InitialiseSocketHandler(socket);
}
}
}
}
else
{
FtpServerMessageHandler.SendMessage(0, "Error in starting FTP server");
}
}