protected virtual void Dispose(bool disposing)
{
lock (this)
{
_disposed = true;
if (disposing)
{
}
try
{
FtpDataConnection dc = _currentDC;
if (null != dc)
{
dc.Dispose();
}
}
catch (Exception e)
{
NSTrace.WriteLineError("DTP.Dispose() ex: " + e.ToString());
}
catch
{
NSTrace.WriteLineError("DTP.Dispose() non cls ex: " + Environment.StackTrace);
}
}
}
//----------------------------------------
//simply reset data connection
internal void Reset()
{
FtpDataConnection curDC = _currentDC;
if (null != curDC)
{
curDC.Abort();
}
}
void GetDC_End(IAsyncResult ar)
{
RunDTP_SO stateObj = (RunDTP_SO)ar.AsyncState;
try
{
stateObj.UpdateContext();
lock (this)
{
if (!_disposed)
{
_currentDC = stateObj.GetDC_Cmd.EndExecute(ar);
}
}
CheckDisposed();
//send restart position, if needed
if (stateObj.Restart > 0)
{
string restCmd = "REST " + stateObj.Restart.ToString();
_cc.BeginSendCommandEx(stateObj.Timeout,
restCmd,
new AsyncCallback(this.Restart_End),
stateObj);
}
else
{
//establish connection now, if it is outbound
if (FtpDataConnectionType.Outbound == _currentDC.Type)
{
_currentDC.BeginEstablish(stateObj.Timeout,
new AsyncCallback(this.OutboundEstablish_End),
stateObj);
}
else
{
_cc.BeginSendCommandEx(stateObj.Timeout,
stateObj.Command,
new AsyncCallback(this.SendCommandEx_End),
stateObj);
}
}
}
catch (Exception e)
{
HandleCatch(e, stateObj);
}
catch
{
HandleCatch(null, stateObj);
}
}
void ClearAtEnd(RunDTP_SO stateObj)
{
stateObj.SetCompleted();
//----------------------------------------
//Clear context
_client.CurrentDTP = null;
_currentDC = null;
//----------------------------------------
//Unlock control connection, now the command
//like abort, stat, quit could be issued
UnlockCC(stateObj);
}
///<summary>Processes an FTP command, sent from the client.</summary>
///<param name="Command">The command to process.</param>
///<returns>True if the command may be sent to the server, false otherwise.</returns>
private bool ProcessCommand(string Command)
{
try
{
int Ret = Command.IndexOf(' ');
if (Ret < 0)
{
Ret = Command.Length;
}
switch (Command.Substring(0, Ret).ToUpper().Trim())
{
case "OPEN":
ConnectTo(ParseIPPort(Command.Substring(Ret + 1)));
break;
case "USER":
Ret = Command.IndexOf('@');
if (Ret < 0)
{
return(true);
}
else
{
User = Command.Substring(0, Ret).Trim() + "\r\n";
ConnectTo(ParseIPPort(Command.Substring(Ret + 1)));
}
break;
case "PORT":
ProcessPortCommand(Command.Substring(5).Trim());
break;
case "PASV":
DataForward = new FtpDataConnection();
DataForward.ProcessPasv(this);
return(true);
default:
return(true);
}
return(false);
}
catch
{
Dispose();
return(false);
}
}
///<summary>Processes a PORT command, sent from the client.</summary>
///<param name="Input">The parameters of the PORT command.</param>
private void ProcessPortCommand(string Input)
{
try
{
string[] Parts = Input.Split(',');
if (Parts.Length == 6)
{
DataForward = new FtpDataConnection();
string Reply = DataForward.ProcessPort(new IPEndPoint(IPAddress.Parse(String.Join(".", Parts, 0, 4)), int.Parse(Parts[4]) * 256 + int.Parse(Parts[5])));
DestinationSocket.BeginSend(Encoding.ASCII.GetBytes(Reply), 0, Reply.Length, SocketFlags.None, new AsyncCallback(OnCommandSent), DestinationSocket);
}
}
catch
{
Dispose();
}
}
internal IAsyncResult BeginExecute(int timeout,
string command,
FtpDataType dataType,
long restart,
DTPStream userStream,
AsyncCallback cb,
object state)
{
RunDTP_SO stateObj = new RunDTP_SO(timeout,
command,
dataType,
restart,
userStream,
cb,
state);
SetProgress(true);
_currentDC = null;
try
{
//----------------------------------------
//Lock Control connection to prevent
//run the command like abort, quit, stat
//during configuring of data connection
_cc.BeginLock(Timeout.Infinite,
new WaitOrTimerCallback(LockFirst_End),
stateObj);
}
catch (Exception e)
{
SetProgress(false);
CheckDisposed();
NSTrace.WriteLineError(_errMsg + e.ToString());
throw;
}
catch
{
SetProgress(false);
CheckDisposed();
NSTrace.WriteLineError(_errMsgNonCls + Environment.StackTrace.ToString());
throw;
}
return(stateObj);
}
void RunDTP_End(IAsyncResult ar)
{
RunDTP_SO stateObj = (RunDTP_SO)ar.AsyncState;
try
{
stateObj.UpdateContext();
_currentDC.DataTransfered -= new FtpDataConnection.DataTransferedEventHandler(OnDataTransfered);
_currentDC.Completed -= new FtpDataConnection.CompletedEventHandler(OnCompleted);
try
{
//finish DTP...
_currentDC.EndRunDTPStream(ar);
stateObj.ManuallyClosed = _currentDC.ManuallyClosed;
}
catch (FtpAbortedException ex)
{
stateObj.AbortEx = ex;
}
finally
{
_currentDC.Dispose();
_currentDC = null;
}
//----------------------------------------
//Lock control connection again - reading
//responses
_cc.BeginLock(Timeout.Infinite,
new WaitOrTimerCallback(LockLast_End),
stateObj);
}
catch (Exception e)
{
HandleCatch(e, stateObj);
}
catch
{
HandleCatch(null, stateObj);
}
}
internal void Abort()
{
//----------------------------------------
//We need to hold this flag, because its
//determine the behaviour at the last stage
//(during reading responses after DTP).
_aborted = true;
//----------------------------------------
//Abort data-connection manually...
//We need to do it because not everybody
//follow RFC. (RFC: server should close
//data-connection in case of ABORT cmd)
FtpDataConnection curDC = _currentDC;
if (null != curDC)
{
curDC.Abort();
}
}
internal void Execute(int timeout,
string cmd,
FtpDataType dataType,
long restart,
DTPStream userStream)
{
bool ccLocked = false;
//protected component against simultaneuous usage
SetProgress(true);
try
{
//----------------------------------------
//Lock Control connection to prevent
//run the command like abort, quit, stat
//during configuring of data connection
ccLocked = _cc.Lock(Timeout.Infinite);
FtpResponse response = null;
//----------------------------------------
//send transfser type command
if ((false == _client.IsDataTypeWasCached) ||
((true == _client.IsDataTypeWasCached) && (_client.CachedDataType != dataType)))
{
string typeCmd = GetTypeCommand(dataType);
response = _cc.SendCommandEx(timeout, typeCmd);
FtpClient.CheckCompletionResponse(response);
_client.IsDataTypeWasCached = true;
_client.CachedDataType = dataType;
}
//----------------------------------------
//Initialize data connection
_currentDC = null;
Cmd_GetDataConnection getDC = new Cmd_GetDataConnection(_client);
lock (this)
{
if (!_disposed)
{
_currentDC = getDC.Execute(timeout);
}
}
CheckDisposed();
//----------------------------------------
//send restart position, if needed
if (0 < restart)
{
string restCmd = "REST " + restart.ToString();
response = _cc.SendCommandEx(timeout, restCmd);
if (false == response.IsIntermediateReply)
{
throw GetRestartNotSuppException(response);
}
CheckDisposed();
}
//----------------------------------------
//establish connection now, if it is outbound
if (FtpDataConnectionType.Outbound == _currentDC.Type)
{
_currentDC.Establish(timeout);
CheckDisposed();
}
//----------------------------------------
//send transfer request to the server
response = _cc.SendCommandEx(timeout, cmd);
CheckDisposed();
//----------------------------------------
//first respone should be one
//of the 1** - let's check it
if (response.IsCompletionReply) //should not happen
{
NSTrace.WriteLineError("Executing DTP: receive completion as first reply.");
//_currentDC.AbortAsyncEstablish();
}
else
{
FtpClient.CheckPreliminaryResponse(response);
//----------------------------------------
//establish connection now, if it is inbound
if (FtpDataConnectionType.Inbound == _currentDC.Type)
{
_currentDC.Establish(timeout);
CheckDisposed();
}
FtpAbortedException abortEx = null;
try
{
//----------------------------------------
//subscribe to data events
_currentDC.DataTransfered += new FtpDataConnection.DataTransferedEventHandler(OnDataTransfered);
_currentDC.Completed += new FtpDataConnection.CompletedEventHandler(OnCompleted);
//----------------------------------------
//prepare for abortion
_aborted = false;
_client.CurrentDTP = this;
//----------------------------------------
//Unlock control connection, now the command
//like abort, stat, quit could be issued
ccLocked = false;
_cc.Unlock();
//----------------------------------------
//start DTP
_currentDC.RunDTPStream(timeout, userStream);
}
catch (FtpAbortedException ex)
{
abortEx = ex;
}
finally
{
_currentDC.DataTransfered -= new FtpDataConnection.DataTransferedEventHandler(OnDataTransfered);
_currentDC.Completed -= new FtpDataConnection.CompletedEventHandler(OnCompleted);
}
//----------------------------------------
//Lock control connection again - reading
//responses
ccLocked = _cc.Lock(Timeout.Infinite);
//----------------------------------------
//Skip preliminary responses
//
for (int i = 0; i < 10; i++)
{
response = _cc.ReadResponse(timeout);
CheckDisposed();
if (response.IsPreliminaryReply)
{
continue;
}
break;
}
//----------------------------------------
//If still receiving priliminary responses
//then it looks suspecious?
//
if (response.IsPreliminaryReply)
{
throw GetTooManyRespException();
}
//----------------------------------------
// Dealing with Abort or Reset
//
if (!_aborted && (null == abortEx))
{
if (!_currentDC.ManuallyClosed)
{
FtpClient.CheckCompletionResponse(response);
}
else
{
//----------------------------------------
//we DID close the data connection,
//so, in general, the response should be
//errorneous - therefore skip checking of it
}
}
else
{
if (null != abortEx) //&& !response.IsCompletionReply)
{
abortEx.SetResponse(response);
}
//----------------------------------------
//If "ABOR" command was sent we need to
//one more response...
//
if (_aborted)
{
response = _cc.ReadResponse(timeout);
}
}
//------------------------------------------
//If "QUIT" was sent during data transfer
//then here we need read one more response
if (_quited)
{
response = _cc.ReadResponse(timeout);
}
if (null != abortEx)
{
throw abortEx;
}
}
}
catch (Exception e)
{
CheckDisposed();
NSTrace.WriteLineError(_errMsg + e.ToString());
throw;
}
catch
{
CheckDisposed();
NSTrace.WriteLineError(_errMsgNonCls + Environment.StackTrace.ToString());
throw;
}
finally
{
SetProgress(false);
_client.CurrentDTP = null;
if (true == ccLocked)
{
_cc.Unlock();
}
}
}
