private void OpenPassiveDataConnection()
{
if (m_DataSocket != null)
{ // Through some exception here because passed socket is already in use
throw new ProtocolViolationException();
}
String IPAddressStr = null;
int Port = 0;
SendCommand("PASV", "");
//FtpWebResponse response = ReceiveResponse();
ResponseDescription resp_desc = ReceiveCommandResponse();
if (!resp_desc.PositiveCompletion)
{
// throw some exception here
throw new ApplicationException("Imposible abrir conexión de datos pasiva\n" + ComposeExceptionMessage(resp_desc, m_sbControlSocketLog.ToString()));
}
//Console.WriteLine(resp_desc.StatusDescription);
//Find the IPAddress and port address from response
IPAddressStr = getIPAddress(resp_desc.StatusDescription);
Port = getPort(resp_desc.StatusDescription);
m_DataSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
if (m_DataSocket == null)
{
throw new ProtocolViolationException("Error al crear el Socket para datos");
}
IPHostEntry serverHostEntry = Dns.GetHostByName(m_RequestUri.Host);
IPEndPoint serverEndPoint = new IPEndPoint(serverHostEntry.AddressList[0], Port);
//IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse(IPAddressStr), Port);
try
{
m_DataSocket.Connect(serverEndPoint);
}
catch
{
m_DataSocket.Close();
m_DataSocket = null;
throw new ProtocolViolationException("Fallo de conexión pasiva");
}
return;
}
internal string ComposeExceptionMessage(ResponseDescription resp_desc, string log)
{
StringBuilder sb = new StringBuilder();
sb.Append("FTP Protocol Error.....\n");
sb.Append("Status: " + resp_desc.Status + "\n");
sb.Append("Description: " + resp_desc.StatusDescription + "\n");
sb.Append("\n");
sb.Append("--------------------------------\n");
sb.Append(log);
sb.Append("\n");
return(sb.ToString());
}
private ResponseDescription ReceiveCommandResponse()
{
ResponseDescription resp_desc = new ResponseDescription();
int StatusCode = 0;
String StatusDescription = null;
bool bCompleteResponse = false;
if (m_ControlSocket == null) // something went wrong protocol violation exception
{
throw new ApplicationException("Conexión de control cerrada");
}
MemoryStream responseStream = new MemoryStream();
while (true)
{
int BufferSize = 256;
Byte[] recvbuffer = new Byte[BufferSize + 1];
int bytesread = 0;
recvbuffer[0] = (Byte)'\0';
bytesread = m_ControlSocket.Receive(recvbuffer, BufferSize, 0);
if (bytesread <= 0)
{
break; // No response recieve to process, exit the loop
}
//copy the recieved data in responsestream
responseStream.Write(recvbuffer, 0, bytesread);
String szResponse = Encoding.ASCII.GetString(recvbuffer, 0, bytesread);
m_sbControlSocketLog.Append(szResponse);
bCompleteResponse = IsCompleteResponse(responseStream);
if (bCompleteResponse)
{
break;
}
}
// @TODO: Remove this stream stuff, and read from stringbuffer instead.
if (bCompleteResponse)
{
// now get status code
try
{
responseStream.Position = 0;
Byte [] bStatusCode = new Byte[3];
responseStream.Read(bStatusCode, 0, 3);
String statuscodestr = Encoding.ASCII.GetString(bStatusCode, 0, 3);
StatusCode = Convert.ToInt16(statuscodestr);
}
catch
{
StatusCode = -1;
}
//
// Copy the response in Status Description
//
int responsesize = (int)responseStream.Length;
responseStream.Position = 0;
Byte [] bStatusDescription = new Byte[responsesize];
responseStream.Read(bStatusDescription, 0, responsesize);
StatusDescription = Encoding.ASCII.GetString(bStatusDescription, 4, responsesize - 4);
}
else
{
// something went wrong here
throw new ProtocolViolationException();
}
resp_desc.Status = StatusCode;
resp_desc.StatusDescription = StatusDescription;
return(resp_desc);
}
private WebResponse GetFtpResponse()
{
FtpWebResponse ftpresponse = null;
if (m_CommandType == FtpCommandType.FtpDataReceiveCommand ||
m_CommandType == FtpCommandType.FtpDataSendCommand)
{
if (_bPassiveMode)
{
OpenPassiveDataConnection();
}
else
{
OpenDataConnection();
}
}
//
// negotiate data connection
//
string sztype = "I";
if (m_szContentType == "ascii")
{
sztype = "A";
}
SendCommand("TYPE", sztype);
ResponseDescription resp_desc = ReceiveCommandResponse();
if (!resp_desc.PositiveCompletion)
{
throw new ApplicationException("Negociación de datos fallida:\n" + m_sbControlSocketLog.ToString());
}
if (m_szServerMethod == "PWD")
{
m_szCmdParameter = null;
}
SendCommand(m_szServerMethod, m_szCmdParameter);
//ftpresponse = ReceiveResponse();
resp_desc = ReceiveCommandResponse();
if (m_CommandType == FtpCommandType.FtpDataSendCommand)
{
//if(resp_desc.Status/100 == 1) // Positive preliminary reply
if (resp_desc.PositivePreliminary) // Positive preliminary reply
{
if (m_RequestStream != null)
{
Socket DataConnection;
if (_bPassiveMode)
{
DataConnection = m_DataSocket;
}
else
{
DataConnection = m_DataSocket.Accept();
}
if (DataConnection == null)
{
throw new ProtocolViolationException("Accept failed ");
}
SendData(DataConnection);
DataConnection.Close();
//ftpresponse = ReceiveResponse();
ResponseDescription resp = ReceiveCommandResponse();
ftpresponse = new FtpWebResponse(resp.Status, resp.StatusDescription, m_sbControlSocketLog.ToString());
}
else
{ // Data to be send is not specified
throw new ApplicationException("Data to be uploaded not specified");
}
}
else
{
//Console.WriteLine(resp_desc.StatusDescription);
m_Exception = new ApplicationException(ComposeExceptionMessage(resp_desc, m_sbControlSocketLog.ToString()));
}
CloseDataConnection();
}
else if (m_CommandType == FtpCommandType.FtpDataReceiveCommand)
{
//if(resp_desc.Status/100 == 1) // Positive preliminary reply
if (resp_desc.PositivePreliminary) // Positive preliminary reply
{
Socket DataConnection;
if (_bPassiveMode)
{
DataConnection = m_DataSocket;
}
else
{
DataConnection = m_DataSocket.Accept();
}
if (DataConnection == null)
{
throw new ProtocolViolationException("Conexión de datos fallida ");
}
Stream datastream = ReceiveData(DataConnection);
DataConnection.Close();
//ftpresponse = ReceiveResponse();
ResponseDescription resp = ReceiveCommandResponse();
ftpresponse = new FtpWebResponse(resp.Status, resp.StatusDescription, m_sbControlSocketLog.ToString());
ftpresponse.SetDownloadStream(datastream);
}
else
{
m_Exception = new ApplicationException(ComposeExceptionMessage(resp_desc, m_sbControlSocketLog.ToString()));
}
CloseDataConnection();
}
else
{
//
// htis is a FtpControlCommand
//
ftpresponse = new FtpWebResponse(resp_desc.Status, resp_desc.StatusDescription, m_sbControlSocketLog.ToString());
}
if (m_Exception != null)
{
Debug.Assert(ftpresponse == null);
throw m_Exception;
}
return(ftpresponse);
}
