Re: Problem with FTP

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Hi,

I'm using the following class to connect to a FTP server from a Pocket PC
2003 device :

---------------------------------------------------------------
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;
using System.Diagnostics;
using System.Windows.Forms;

namespace Canal
{
public class FtpClient
{
public class FtpException : Exception
{
public FtpException(string message) : base(message){}
public FtpException(string message, Exception innerException) :
base(message,innerException){}
}

private static int BUFFER_SIZE = 65535;
private static Encoding ASCII = Encoding.ASCII;
//private static Encoding ASCII = Encoding.Default;
private bool status = true;

private bool verboseDebugging = false;

// defaults
private string server = "localhost";
//private string remotePath = "/";
private string remotePath = "";
private string username = "anonymous";
private string password = "anonymous@xxxxxxxxxxxxx";
private string message = null;
private string result = null;

private int port = 21;
private int bytes = 0;
private int resultCode = 0;

public bool loggedin = false;
private bool binMode = false;

private Byte[] buffer = new Byte[BUFFER_SIZE];
private Socket clientSocket = null;

private int timeoutSeconds = 10;

public FtpClient()
{
}
/// <summary>
///
/// </summary>
/// <param name="server"></param>
/// <param name="username"></param>
/// <param name="password"></param>
public FtpClient(string server, string username, string password)
{
this.server = server;
this.username = username;
this.password = password;
}
/// <summary>
///
/// </summary>
/// <param name="server"></param>
/// <param name="username"></param>
/// <param name="password"></param>
/// <param name="timeoutSeconds"></param>
/// <param name="port"></param>
public FtpClient(string server, string username, string password, int
timeoutSeconds, int port)
{
this.server = server;
this.username = username;
this.password = password;
this.timeoutSeconds = timeoutSeconds;
this.port = port;
}

/// <summary>
/// Display all communications to the debug log
/// </summary>
public bool VerboseDebugging
{
get
{
return this.verboseDebugging;
}
set
{
this.verboseDebugging = value;
}
}
/// <summary>
/// Remote server port. Typically TCP 21
/// </summary>
public int Port
{
get
{
return this.port;
}
set
{
this.port = value;
}
}
/// <summary>
/// Timeout waiting for a response from server, in seconds.
/// </summary>
public int Timeout
{
get
{
return this.timeoutSeconds;
}
set
{
this.timeoutSeconds = value;
}
}
/// <summary>
/// Gets and Sets the name of the FTP server.
/// </summary>
/// <returns></returns>
public string Server
{
get
{
return this.server;
}
set
{
this.server = value;
}
}
/// <summary>
/// Gets and Sets the port number.
/// </summary>
/// <returns></returns>
public int RemotePort
{
get
{
return this.port;
}
set
{
this.port = value;
}
}
/// <summary>
/// GetS and Sets the remote directory.
/// </summary>
public string RemotePath
{
get
{
return this.remotePath;
}
set
{
this.remotePath = value;
}

}
/// <summary>
/// Gets and Sets the username.
/// </summary>
public string Username
{
get
{
return this.username;
}
set
{
this.username = value;
}
}
/// <summary>
/// Gets and Set the password.
/// </summary>
public string Password
{
get
{
return this.password;
}
set
{
this.password = value;
}
}

/// <summary>
/// If the value of mode is true, set binary mode for downloads, else,
Ascii mode.
/// </summary>
public bool BinaryMode
{
get
{
return this.binMode;
}
set
{
if ( this.binMode == value ) return;

if ( value )
sendCommand("TYPE I");

else
sendCommand("TYPE A");

if ( this.resultCode != 200 ) throw new
FtpException(result.Substring(4));
}
}
public void Login()
{
if (this.loggedin) this.Close();

Debug.WriteLine("Opening connection to " + this.server, "FtpClient" );
IPAddress addr = null;
IPEndPoint ep = null;
try
{
this.clientSocket = new Socket( AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp );
// addr = Dns.Resolve(this.server).AddressList[0];
addr = IPAddress.Parse(this.server);
ep = new IPEndPoint(addr, this.port);
this.clientSocket.Connect(ep);

this.readResponse();

if(this.resultCode != 220)
{
throw new FtpException(this.result.Substring(4));
this.Close();
status = false;
}

this.sendCommand( "USER " + username );

if( !(this.resultCode == 331 || this.resultCode == 230) )
{
this.cleanup();
status = false;
throw new FtpException(this.result.Substring(4));
}

if( this.resultCode != 230 )
{
this.sendCommand( "PASS " + password );

if( !(this.resultCode == 230 || this.resultCode == 202) )
{
status = false; this.cleanup();
throw new FtpException(this.result.Substring(4));
}
else this.loggedin = true;
}
if (loggedin)
{ Debug.WriteLine( "Connected to " + this.server, "FtpClient" );
this.ChangeDir(this.remotePath);
}
}
catch (Exception ex)
{ status = false;
if ( this.clientSocket != null && this.clientSocket.Connected )
this.clientSocket.Close();
throw new FtpException("Couldn't connect to remote server",ex);
//return false;
}
}
public void Close()
{ Debug.WriteLine("Closing connection to " + this.server, "FtpClient" );
if( this.clientSocket != null )
{
this.sendCommand("QUIT"); }
this.cleanup();
}

/// <summary>
/// Return a string array containing the remote directory's file list.
/// </summary>
/// <returns></returns>
public string[] GetFileList()
{
return this.GetFileList("*.*");
}

/// <summary>
/// Return a string array containing the remote directory's file list.
/// </summary>
/// <param name="mask"></param>
/// <returns></returns>
public string[] GetFileList(string mask)
{
if ( !this.loggedin ) this.Login();

Socket cSocket = createDataSocket();

this.sendCommand("NLST " + mask);

if(!(this.resultCode == 150 || this.resultCode == 125)) throw new
FtpException(this.result.Substring(4));

this.message = "";

DateTime timeout = DateTime.Now.AddSeconds(this.timeoutSeconds);

while( timeout > DateTime.Now )
{
int bytes = cSocket.Receive(buffer, buffer.Length, 0);
this.message += ASCII.GetString(buffer, 0, bytes);

if ( bytes < this.buffer.Length ) break;
}

string[] msg = this.message.Replace("\r","").Split('\n');

cSocket.Close();

if ( this.message.IndexOf( "No such file or directory" ) != -1 )
msg = new string[]{};

this.readResponse();

if ( this.resultCode != 226 )
msg = new string[]{};
// throw new FtpException(result.Substring(4));

return msg;
}

/// <summary>
/// Return the size of a file.
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public long GetFileSize(string fileName)
{
if ( !this.loggedin ) this.Login();

this.sendCommand("SIZE " + fileName);
long size=0;

if ( this.resultCode == 213 )
size = long.Parse(this.result.Substring(4));
else
throw new FtpException(this.result.Substring(4));

return size;
}

///
/// Return the date of a file.
///
///
///
public DateTime getFileDate(string fileName)
{
string txTime;
if ( !this.loggedin ) this.Login();
sendCommand("MDTM " + fileName);
DateTime dtFile;
if(this.resultCode == 213)
{
// format "YYYYMMDDhhmmss"
txTime = this.result.Substring(8, 2) + "/"
+ this.result.Substring(10, 2) + "/"
+ this.result.Substring(4, 4) + " "
+ this.result.Substring(12, 2) + ":"
+ this.result.Substring(14, 2) + ":"
+ this.result.Substring(16, 2);
dtFile = Convert.ToDateTime(txTime).ToLocalTime();
}
else
throw new IOException(this.result.Substring(4));
return dtFile;
}


/// <summary>
/// Download a file to the Assembly's local directory,
/// keeping the same file name.
/// </summary>
/// <param name="remFileName"></param>
public void Download(string remFileName)
{
this.Download(remFileName,"",false);
}

/// <summary>
/// Download a remote file to the Assembly's local directory,
/// keeping the same file name, and set the resume flag.
/// </summary>
/// <param name="remFileName"></param>
/// <param name="resume"></param>
public void Download(string remFileName,Boolean resume)
{
this.Download(remFileName,"",resume);
}

/// <summary>
/// Download a remote file to a local file name which can include
/// a path. The local file name will be created or overwritten,
/// but the path must exist.
/// </summary>
/// <param name="remFileName"></param>
/// <param name="locFileName"></param>
public void Download(string remFileName,string locFileName)
{
this.Download(remFileName,locFileName,false);
}

/// <summary>
/// Download a remote file to a local file name which can include
/// a path, and set the resume flag. The local file name will be
/// created or overwritten, but the path must exist.
/// </summary>
/// <param name="remFileName"></param>
/// <param name="locFileName"></param>
/// <param name="resume"></param>
public void Download(string remFileName,string locFileName,Boolean resume)
{
if ( !this.loggedin ) this.Login();

this.BinaryMode = true;

Debug.WriteLine("Downloading file " + remFileName + " from " + server +
"/" + remotePath, "FtpClient" );

if (locFileName.Equals(""))
{
locFileName = remFileName;
}

FileStream output = null;

if ( !File.Exists(locFileName) )
output = File.Create(locFileName);
else
output = new FileStream(locFileName,FileMode.Open);

Socket cSocket = createDataSocket();
long offset = 0;

if ( resume )
{
offset = output.Length;

if ( offset > 0 )
{
this.sendCommand( "REST " + offset );
if ( this.resultCode != 350 )
{
//Server dosnt support resuming
offset = 0;
Debug.WriteLine("Resuming not supported:" + result.Substring(4),
"FtpClient" );
}
else
{
Debug.WriteLine("Resuming at offset " + offset, "FtpClient" );
output.Seek( offset, SeekOrigin.Begin );
}
}
}

this.sendCommand("RETR " + remFileName);

if ( this.resultCode != 150 && this.resultCode != 125 )
{
if (this.resultCode != 226 && this.resultCode != 250)
throw new FtpException(this.result.Substring(4));
}

DateTime timeout = DateTime.Now.AddSeconds(this.timeoutSeconds);

while ( timeout > DateTime.Now )
{
this.bytes = cSocket.Receive(buffer, buffer.Length, 0);
output.Write(this.buffer,0,this.bytes);

if ( this.bytes <= 0)
{
break;
}
}

output.Close();

// this.readResponse();

if ( cSocket.Connected ) cSocket.Close();

// if( this.resultCode != 226 && this.resultCode != 250 )
// throw new FtpException(this.result.Substring(4));
}


/// <summary>
/// Upload a file.
/// </summary>
/// <param name="fileName"></param>
public void Upload(string fileName)
{
this.Upload(fileName, false);
}


/// <summary>
/// Upload a file and set the resume flag.
/// </summary>
/// <param name="fileName"></param>
/// <param name="resume"></param>
public void Upload(string fileName, bool resume)
{
if ( !this.loggedin ) this.Login();

Socket cSocket = null ;
long offset = 0;

if(resume)
{
try
{
this.BinaryMode = true;
offset = GetFileSize( Path.GetFileName(fileName) );
}
catch(Exception e)
{
// Fichier inexistant
status = false;
MessageBox.Show(e.ToString(),"Erreur");
offset = 0;
}
}

// open stream to read file
FileStream input = new FileStream(fileName,FileMode.Open);

if (resume && input.Length < offset)
{
// Fichier de taille différente
Debug.WriteLine("Overwriting " + fileName, "FtpClient");
offset = 0;
}
else if ( resume && input.Length == offset )
{
// file done
input.Close();
Debug.WriteLine("Skipping completed " + fileName + " - turn resume off
to not detect.", "FtpClient");
return;
}

// dont create untill we know that we need it
cSocket = this.createDataSocket();

if ( offset > 0 )
{
this.sendCommand( "REST " + offset );
if ( this.resultCode != 350 )
{
status = false;
Debug.WriteLine("Resuming not supported", "FtpClient");
offset = 0;
}
}

this.sendCommand( "STOR " + Path.GetFileName(fileName) );

if (this.resultCode != 125 && this.resultCode != 150)
{
status = false;
throw new FtpException(result.Substring(4));
}

if ( offset != 0 )
{
Debug.WriteLine("Resuming at offset " + offset, "FtpClient" );

input.Seek(offset,SeekOrigin.Begin);
}

Debug.WriteLine( "Uploading file " + fileName + " to " + remotePath,
"FtpClient" );

while ((bytes = input.Read(buffer,0,buffer.Length)) > 0)
{
cSocket.Send(buffer, bytes, 0);
}

input.Close();

// this.readResponse();

if (cSocket.Connected)
{
cSocket.Close();
}

// if( this.resultCode != 226 && this.resultCode != 250 ) throw new
FtpException(this.result.Substring(4));
}

/// <summary>
/// Upload a directory and its file contents
/// </summary>
/// <param name="path"></param>
/// <param name="recurse">Whether to recurse sub directories</param>
public void UploadDirectory(string path, bool recurse)
{
this.UploadDirectory(path,recurse,"*.*");
}

/// <summary>
/// Upload a directory and its file contents
/// </summary>
/// <param name="path"></param>
/// <param name="recurse">Whether to recurse sub directories</param>
/// <param name="mask">Only upload files of the given mask - everything
is '*.*'</param>
public void UploadDirectory(string path, bool recurse, string mask)
{
string[] dirs = path.Replace("/",@"\").Split('\\');
string rootDir = dirs[ dirs.Length - 1 ];

// make the root dir if it doed not exist
if ( this.GetFileList(rootDir).Length < 1 ) this.MakeDir(rootDir);

this.ChangeDir(rootDir);

foreach ( string file in Directory.GetFiles(path,mask) )
{
this.Upload(file,true);
}
if ( recurse )
{
foreach ( string directory in Directory.GetDirectories(path) )
{
this.UploadDirectory(directory,recurse,mask);
}
}

this.ChangeDir("..");
}

/// <summary>
/// Delete a file from the remote FTP server.
/// </summary>
/// <param name="fileName"></param>
public void DeleteFile(string fileName)
{
if ( !this.loggedin ) this.Login();

this.sendCommand( "DELE " + fileName );

if ( this.resultCode != 250 ) throw new
FtpException(this.result.Substring(4));

Debug.WriteLine( "Deleted file " + fileName, "FtpClient" );
}

/// <summary>
/// Rename a file on the remote FTP server.
/// </summary>
/// <param name="oldFileName"></param>
/// <param name="newFileName"></param>
/// <param name="overwrite">setting to false will throw exception if it
exists</param>
public void RenameFile(string oldFileName,string newFileName, bool
overwrite)
{
if ( !this.loggedin ) this.Login();

this.sendCommand( "RNFR " + oldFileName );

if ( this.resultCode != 350 )
{
status = false;
//throw new FtpException(this.result.Substring(4));
throw new FtpException(this.result);
}

if( !overwrite && this.GetFileList(newFileName).Length > 0 )
{
status = false;
throw new FtpException("File already exists");
}

this.sendCommand( "RNTO " + newFileName );

if ( this.resultCode != 250 )
{
status = false;
throw new FtpException(this.result.Substring(4));
}

Debug.WriteLine( "Renamed file " + oldFileName + " to " + newFileName,
"FtpClient" );
}

/// <summary>
/// Create a directory on the remote FTP server.
/// </summary>
/// <param name="dirName"></param>
public void MakeDir(string dirName)
{
if ( !this.loggedin ) this.Login();

this.sendCommand( "MKD " + dirName );

if ( this.resultCode != 250 && this.resultCode != 257 ) throw new
FtpException(this.result.Substring(4));

Debug.WriteLine( "Created directory " + dirName, "FtpClient" );
}

/// <summary>
/// Delete a directory on the remote FTP server.
/// </summary>
/// <param name="dirName"></param>
public void RemoveDir(string dirName)
{
if ( !this.loggedin ) this.Login();

this.sendCommand( "RMD " + dirName );

if ( this.resultCode != 250 ) throw new
FtpException(this.result.Substring(4));

Debug.WriteLine( "Removed directory " + dirName, "FtpClient" );
}

/// <summary>
/// Change the current working directory on the remote FTP server.
/// </summary>
/// <param name="dirName"></param>
public void ChangeDir(string dirName)
{
if( dirName == null || dirName.Equals(".") || dirName.Length == 0 )
{
return;
}

if ( !this.loggedin ) this.Login();

this.sendCommand( "CWD " + dirName );

if ( this.resultCode != 250 )
{
throw new FtpException("ChangeDir1 " + result.Substring(4));
status = false;
}

this.sendCommand( "PWD" );

if ( this.resultCode != 257 )
{
throw new FtpException("ChangeDir1 " + result.Substring(4));
status = false;
}

this.remotePath = this.message.Split('"')[1];

Debug.WriteLine( "Current directory is " + this.remotePath, "FtpClient"
);
}

/// <summary>
///
/// </summary>
private void readResponse()
{
this.message = "";
this.result = this.readLine();

if ( this.result.Length > 3 )
this.resultCode = int.Parse( this.result.Substring(0,3) );
else
this.result = null;
}

/// <summary>
///
/// </summary>
/// <returns></returns>
private string readLine()
{
while(true)
{
this.bytes = clientSocket.Receive( this.buffer, this.buffer.Length, 0 );
this.message += ASCII.GetString( this.buffer, 0, this.bytes );

if ( this.bytes < this.buffer.Length )
{
break;
}
}

string[] msg = this.message.Split('\n');

if ( this.message.Length > 2 )
this.message = msg[ msg.Length - 2 ];

else
this.message = msg[0];

if ( this.message.Length > 4 && !this.message.Substring(3,1).Equals(" ")
) return this.readLine();

if ( this.verboseDebugging )
{
for(int i = 0; i < msg.Length - 1; i++)
{
Debug.Write( msg[i], "FtpClient" );
}
}

return message;
}

/// <summary>
///
/// </summary>
/// <param name="command"></param>
private void sendCommand(string command)
{
try
{
if ( this.verboseDebugging ) Debug.WriteLine(command,"FtpClient");

//Byte[] cmdBytes = Encoding.ASCII.GetBytes( ( command + "\r\n"
).ToCharArray() );
Byte[] cmdBytes = Encoding.ASCII.GetBytes( ( command + "\r\n"
).ToCharArray() );
clientSocket.Send( cmdBytes, cmdBytes.Length, 0);
this.readResponse();
}
catch
{
}
}

/// <summary>
/// when doing data transfers, we need to open another socket for it.
/// </summary>
/// <returns>Connected socket</returns>
private Socket createDataSocket()
{
char[] chArray;
this.sendCommand("PASV");

if ( this.resultCode != 227 ) throw new
FtpException(this.result.Substring(4));

int index1 = this.result.IndexOf('(');
int index2 = this.result.IndexOf(')');

string ipData = this.result.Substring(index1+1,index2-index1-1);

int[] parts = new int[6];

int len = ipData.Length;
int partCount = 0;
string buf="";

for (int i = 0; i < len && partCount <= 6; i++)
{
//char ch = char.Parse(ipData.Substring(i,1));
chArray = (ipData.Substring(i,1)).ToCharArray();
char ch = chArray[0];

if ( char.IsDigit(ch) )
buf+=ch;

else if (ch != ',')
throw new FtpException("Malformed PASV result: " + result);

if ( ch == ',' || i+1 == len )
{
try
{
parts[partCount++] = int.Parse(buf);
buf = "";
}
catch (Exception ex)
{
throw new FtpException("Malformed PASV result (not supported?): " +
this.result, ex);
}
}
}

string ipAddress = parts[0] + "." + parts[1]+ "." + parts[2] + "." +
parts[3];

int port = (parts[4] << 8) + parts[5];

Socket socket = null;
IPEndPoint ep = null;

try
{
socket = new
Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
IPAddress addr = IPAddress.Parse(ipAddress);
ep = new IPEndPoint(addr, port);
socket.Connect(ep);
}
catch(Exception ex)
{
// doubtfull....
if ( socket != null && socket.Connected ) socket.Close();

throw new FtpException("Can't connect to remote server", ex);
}

return socket;
}

/// <summary>
/// Always release those sockets.
/// </summary>
private void cleanup()
{
if ( this.clientSocket!=null )
{
this.clientSocket.Close();
this.clientSocket = null;
}
this.loggedin = false;
}
public bool retStatus()
{
return status;
}

/// <summary>
/// Destuctor
/// </summary>
~FtpClient()
{
this.cleanup();
}
/**************************************************************************************************************/
#region Async methods (auto generated)


}
}
---------------------------------------------------------------
In order to connect, I have the following code :
-------------------
....
FtpClient ftpC = new FtpClient((string) ftpList[0],(string)
ftpList[2],(string) ftpList[3]);
ftpC.Login();
ftpC.ChangeDir((string) ftpList[1]);
ftpC.Upload(file);
ftpC.Close();
....
-------------------

The error message I obtained is the following :
"Couldn't connect to remote server".
If we see the code above, the login phase doesn't pass well.
I'm using WinInet.

Thanks for any information.


"Chris Tacke, eMVP" wrote:

> A bit of actual information about what "can't connect" means would go a long
> way toward us helping you. You might consider giving us some info on
> exactly how you're connectiong (wininte, socket, etc).
>
> --
> Chris Tacke
> Co-founder
> OpenNETCF.org
> Has OpenNETCF helped you? Consider donating to support us!
> http://www.opennetcf.org/donate
>
>
> "Gandalf" <Gandalf@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:BABD6E4E-DFD0-4BE0-AF57-E763F1842C78@xxxxxxxxxxxxxxxx
> > Hi,
> >
> > I have a C# FTP class for Pocket PC 2003 which makes some ftp transfert
> > but
> > I can't connect on specific FTP server, especially "IIS 5.0" and
> > "TypeSoftFtpServer".
> >
> > I have no problem with IIS 6.0.
> >
> > Does someone have an idea of that problem ?
> >
> > Thanks in advance.

.

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