/// <summary>
/// Worker thread for remove directory
/// </summary>
private void RMDThread()
{
if (RequestPath.Length < 2)
{
Debug.Print("the path is not long enough");
throw new ArgumentException("The path is not a directory");
}
else if (RequestPath[RequestPath.Length - 1] != "")
{
// the path is a directory
Debug.Print("the path does not lead to a directory");
throw new ArgumentException("The path is not a directory");
}
try
{
string command;
int responseNumber;
if (RequestPath.Length > 2)
{
command = "CWD ";
for (int i = 0; i < RequestPath.Length - 2; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
return;
}
}
command = "RMD " + RequestPath[RequestPath.Length - 2] + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
Debug.Print("cannot remove directory with wrong number: " + responseNumber.ToString());
if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Deleting directory fail due to connection problem.");
}
}
/// <summary>
/// Logging into the ftp server
/// </summary>
/// <returns>
/// -1: unknown errors or exceptions happened
/// 0: login succeed
/// >0: reply code tells why server rejects the login process
/// </returns>
private int Login()
{
string command = null;
byte[] dataBuffer = new byte[1000];
int responseNumber = 0;
m_StatusCode = FTPStatusCode.NotLoggedIn;
try
{
CommandSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
CommandSocket.ReceiveTimeout = m_CommandTimeout;
IPAddress hostIP = IPAddress.Parse(ServerIP);
CommandSocket.Connect(new IPEndPoint(hostIP, ServerPort));
responseNumber = WaitResponse();
if (responseNumber != 220)
{
// server not ready for new user login
return(responseNumber);
}
command = "USER " + m_Credential.UserName + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 331)
{
// user name is not allowed
return(responseNumber);
}
command = "PASS " + m_Credential.Password + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 230)
{
// password does not match
return(responseNumber);
}
m_StatusCode = FTPStatusCode.LoggedInProceed;
responseNumber = 0;
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Login fail due to connection problem.");
}
return(responseNumber);
}
/// <summary>
/// parse the response number to a status code
/// </summary>
/// <param name="responseNumber"></param>
/// <returns>
/// true if response number is less than 400
/// </returns>
private bool SetStatusCode(int responseNumber)
{
if (responseNumber >= 500)
{
Debug.Print(Method + " with wrong number: " + responseNumber.ToString());
if (responseNumber == 502)
{
m_StatusCode = FTPStatusCode.CommandNotImplemented;
}
else if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else if (responseNumber == 553)
{
m_StatusCode = FTPStatusCode.FilenameNotAllowed;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return(false);
}
else if (responseNumber >= 400)
{
Debug.Print(Method + " with wrong number: " + responseNumber.ToString());
if (responseNumber == 452)
{
m_StatusCode = FTPStatusCode.InsufficientSpace;
}
else
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// Functionality to run LIST scenario
/// </summary>
private void LISTThread()
{
if (RequestPath[RequestPath.Length - 1] != "")
{
// the path is a directory
Debug.Print("the path does not lead to a directory");
throw new ArgumentException("The path is not a directory");
}
try
{
string command = "CWD ";
for (int i = 0; i < RequestPath.Length - 1; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
int responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
using (Socket listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
ConfigureListenSocket(listenSocket);
FTPActivePort = (listenSocket.LocalEndPoint as IPEndPoint).Port;
command = "PORT " + FormatFTPAddress(FTPActiveAddress, FTPActivePort) + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
while (responseNumber == 230)
{
responseNumber = WaitResponse();
}
if (responseNumber != 200)
{
Debug.Print("port with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
CommandSocket.Send(Encoding.UTF8.GetBytes("LIST\r\n"));
responseNumber = WaitResponse();
if (!SetStatusCode(responseNumber))
{
return;
}
using (Timer timer = new Timer(TimerCallback, null, m_DataTimeout, -1))
{
DataSocket = listenSocket.Accept();
}
DataSocketReady = true;
m_DataStream = new NetworkStream(DataSocket);
m_FtpResponse = new FtpWebResponse(m_DataStream);
m_StreamReady.Set();
responseNumber = WaitResponse(-1);
TransmissionFinished = true;
if (responseNumber != 226)
{
Debug.Print("list end with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
m_StatusCode = FTPStatusCode.CommandProceed;
//while (!m_RequestClosed)
//{
// // do not release the resource until the request is closed
//}
m_StatusCode = FTPStatusCode.ClosingData;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Downloading fail due to connection problem.");
}
}
/// <summary>
/// Worker thread to rename a file or directory
/// </summary>
private void RenameThread()
{
if (RenameTo == null)
{
Debug.Print("New name is not selected");
throw new ArgumentNullException("New name is not selected");
}
int oldIndex;
if (RequestPath[RequestPath.Length - 1] == "")
{
throw new WebException("The requested URI is invalid for this FTP command.");
}
else
{
oldIndex = RequestPath.Length - 1;
}
try
{
string command = "CWD ";
for (int i = 0; i < oldIndex; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
int responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
command = "RNFR " + RequestPath[oldIndex] + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 350)
{
Debug.Print("REFR fail with wrong number: " + responseNumber.ToString());
if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return;
}
command = "RNTO " + RenameTo + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
Debug.Print("RETO fail with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Renaming fail due to connection problem.");
}
}
/// <summary>
/// Worker thread for delete file
/// </summary>
private void DELEThread()
{
if (RequestPath[RequestPath.Length - 1] == "")
{
// the path is a directory
Debug.Print("the path leads to a directory");
throw new ArgumentException("The path is a directory");
}
try
{
string command = "CWD ";
for (int i = 0; i < RequestPath.Length - 1; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
int responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
command = "DELE " + RequestPath[RequestPath.Length - 1] + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
Debug.Print("deletion fail with wrong number: " + responseNumber.ToString());
if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Deleting file fail due to connection problem.");
}
}
/// <summary>
/// Worker thread for make directory
/// </summary>
private void MKDThread()
{
if (RequestPath.Length < 2)
{
Debug.Print("the path is not long enough");
throw new ArgumentException("The path is not a directory");
}
else if (RequestPath[RequestPath.Length - 1] != "")
{
// the path is a directory
Debug.Print("the path does not lead to a directory");
throw new ArgumentException("The path is not a directory");
}
try
{
string command;
int responseNumber;
// need to change directory
if (RequestPath.Length > 2)
{
command = "CWD ";
for (int i = 0; i < RequestPath.Length - 2; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
}
command = "MKD " + RequestPath[RequestPath.Length - 2] + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 257)
{
Debug.Print("cannot create directory with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Making directory fail due to connection problem.");
}
}
/// <summary>
/// Logging into the ftp server
/// </summary>
/// <returns>
/// -1: unknown errors or exceptions happened
/// 0: login succeed
/// >0: reply code tells why server rejects the login process
/// </returns>
private int Login()
{
string command = null;
byte[] dataBuffer = new byte[1000];
int responseNumber = 0;
m_StatusCode = FTPStatusCode.NotLoggedIn;
try
{
CommandSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
CommandSocket.ReceiveTimeout = m_CommandTimeout;
IPAddress hostIP = IPAddress.Parse(ServerIP);
CommandSocket.Connect(new IPEndPoint(hostIP, ServerPort));
responseNumber = WaitResponse();
if (responseNumber != 220)
{
// server not ready for new user login
return responseNumber;
}
command = "USER " + m_Credential.UserName + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 331)
{
// user name is not allowed
return responseNumber;
}
command = "PASS " + m_Credential.Password + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 230)
{
// password does not match
return responseNumber;
}
m_StatusCode = FTPStatusCode.LoggedInProceed;
responseNumber = 0;
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Login fail due to connection problem.");
}
return responseNumber;
}
/// <summary>
/// parse the response number to a status code
/// </summary>
/// <param name="responseNumber"></param>
/// <returns>
/// true if response number is less than 400
/// </returns>
private bool SetStatusCode(int responseNumber)
{
if (responseNumber >= 500)
{
Debug.Print(Method + " with wrong number: " + responseNumber.ToString());
if (responseNumber == 502)
{
m_StatusCode = FTPStatusCode.CommandNotImplemented;
}
else if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else if (responseNumber == 553)
{
m_StatusCode = FTPStatusCode.FilenameNotAllowed;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return false;
}
else if (responseNumber >= 400)
{
Debug.Print(Method + " with wrong number: " + responseNumber.ToString());
if (responseNumber == 452)
{
m_StatusCode = FTPStatusCode.InsufficientSpace;
}
else
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
return false;
}
else
{
return true;
}
}
/// <summary>
/// Functionality to run LIST scenario
/// </summary>
private void LISTThread()
{
if (RequestPath[RequestPath.Length - 1] != "")
{
// the path is a directory
Debug.Print("the path does not lead to a directory");
throw new ArgumentException("The path is not a directory");
}
try
{
string command = "CWD ";
for (int i = 0; i < RequestPath.Length - 1; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
int responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
using (Socket listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
ConfigureListenSocket(listenSocket);
FTPActivePort = (listenSocket.LocalEndPoint as IPEndPoint).Port;
command = "PORT " + FormatFTPAddress(FTPActiveAddress, FTPActivePort) + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
while (responseNumber == 230)
{
responseNumber = WaitResponse();
}
if (responseNumber != 200)
{
Debug.Print("port with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
CommandSocket.Send(Encoding.UTF8.GetBytes("LIST\r\n"));
responseNumber = WaitResponse();
if (!SetStatusCode(responseNumber))
{
return;
}
using (Timer timer = new Timer(TimerCallback, null, m_DataTimeout, -1))
{
DataSocket = listenSocket.Accept();
}
DataSocketReady = true;
m_DataStream = new NetworkStream(DataSocket);
m_FtpResponse = new FtpWebResponse(m_DataStream);
m_StreamReady.Set();
responseNumber = WaitResponse(-1);
TransmissionFinished = true;
if (responseNumber != 226)
{
Debug.Print("list end with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
m_StatusCode = FTPStatusCode.CommandProceed;
//while (!m_RequestClosed)
//{
// // do not release the resource until the request is closed
//}
m_StatusCode = FTPStatusCode.ClosingData;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Downloading fail due to connection problem.");
}
}
/// <summary>
/// Worker thread to rename a file or directory
/// </summary>
private void RenameThread()
{
if (RenameTo == null)
{
Debug.Print("New name is not selected");
throw new ArgumentNullException("New name is not selected");
}
int oldIndex;
if (RequestPath[RequestPath.Length - 1] == "")
{
throw new WebException("The requested URI is invalid for this FTP command.");
}
else
{
oldIndex = RequestPath.Length - 1;
}
try
{
string command = "CWD ";
for (int i = 0; i < oldIndex; i++)
{
command += RequestPath[i] + "/";
}
command += "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
int responseNumber = WaitResponse();
if (responseNumber != 250)
{
// change directory failed
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
command = "RNFR " + RequestPath[oldIndex] + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 350)
{
Debug.Print("REFR fail with wrong number: " + responseNumber.ToString());
if (responseNumber == 550)
{
m_StatusCode = FTPStatusCode.ResourceUnavailableOrBusy;
}
else
{
m_StatusCode = FTPStatusCode.CommandFailed;
}
return;
}
command = "RNTO " + RenameTo + "\r\n";
CommandSocket.Send(Encoding.UTF8.GetBytes(command));
responseNumber = WaitResponse();
if (responseNumber != 250)
{
Debug.Print("RETO fail with wrong number: " + responseNumber.ToString());
m_StatusCode = FTPStatusCode.CommandFailed;
return;
}
}
catch (SocketException se)
{
Debug.Print(se.Message);
throw new WebException("Renaming fail due to connection problem.");
}
}
