Can't get attributes of file '/'.

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codenat
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Can't get attributes of file '/'.

Hi,
I have written a Windows service that periodically checks the FTP for new files. When it finds a file, it FTPs the file to another server. The first time it found a file, I received this error:
Message: Can't get attributes of file '/'.
Stack Trace: at WinSCP.OperationResultBase.Check()
I am attaching a log of the event.

Here is the method that I am using:
private void qtsTimer_Elapsed(object sender, ElapsedEventArgs e)
{
    string localPath = @"U:\CLM";
    string remotePath = "/";
 
    MyProgram_eventLog.WriteEntry("Checking the " + remotePath + " with the qtsTimer: " + DateTime.Now.ToString(), EventLogEntryType.Information);
 
    FtpQTS(localPath, remotePath);
}
 
private void FtpQTS(string localPath, string remotePath)
{
    ///<summary>The full path of the file on the FTP server.</summary>
    string remoteFile;
 
    try
    {
        // Setup session options
        SessionOptions sessionOptions = new SessionOptions
        {
            Protocol = Protocol.Ftp,
            HostName = "ftp.comany.com",
            UserName = "ftpuser",
            Password = "ftppass",
            // If using Protocol.Sftp then you would add the following line
            // SshHostKeyFingerprint = "ssh-rsa 2048 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx"
        };
        MyProgram_eventLog.WriteEntry("A connection to ftpuser on ftpserver has been made", EventLogEntryType.Information);
 
        using (Session session = new Session())
        {
            //log session
            session.SessionLogPath = @"U:\CLM\Logs\WinSCPLog.log";
 
            // Connect
            session.Open(sessionOptions);
 
            RemoteDirectoryInfo remoteDirectory = session.ListDirectory(remotePath);
 
            MyProgram_eventLog.WriteEntry("Checking " + remotePath + " on ftpuser ftpserver for new files", EventLogEntryType.Information);
 
            foreach (RemoteFileInfo fileInfo in remoteDirectory.Files)
            {
                if (fileInfo.Name != "..")
                {
                    remoteFile = remotePath + fileInfo.Name;
                    MyProgram_eventLog.WriteEntry("A new file has been found: " + fileInfo.Name, EventLogEntryType.Information);
 
                    // Download the file and throw on any error
                    session.GetFiles(remotePath, localPath).Check();
                    MyProgram_eventLog.WriteEntry("Download to " + localPath + " done", EventLogEntryType.Information);
 
                    // Remove the file
                    session.RemoveFiles(remoteFile);
                    MyProgram_eventLog.WriteEntry("Removed file: " + remoteFile, EventLogEntryType.Information);
                }
                else
                {
                    MyProgram_eventLog.WriteEntry("Found " + fileInfo.Name + " which is not a new file", EventLogEntryType.Information);
                }
            }
        }
    }
    catch (Exception ex)
    {
        MyProgram_eventLog.WriteEntry("There was a problem in FtpQTS(): " + ex.ToString(), EventLogEntryType.Error);
        EmailError(ref ex);
    }
}
Thanks for your help.
Description: WinSCP Session Log

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martin
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Re: Can't get attributes of file '/'.

There's no "Can't get attributes of file '/'." error in the log. Are you sure you have attached a correct log file? What it is a full call stack of the exception? Do you know what line of a code throws the exception?

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codenat
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Re: Can't get attributes of file '/'.

Sorry ... I must've gotten my logs confused. Attached is the log with the error.

Full error:
Message: Can't get attributes of file '/'.
Stack Trace:
at WinSCP.OperationResultBase.Check() at FTP_Check4Files.FTP_Check4Files.FtpQTS(String localPath, String remotePath)

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martin
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Re: Can't get attributes of file '/'.

It looks like a bug in the FTP server.
When WinSCP asks it for a details on the root folder (/), it responds with information on ftpuser folder.
It's likely because the FTP root is physically a path like /home/ftpuser.
But the FTP server should completely isolate the client from that, let only that this is a security flaw.
Do you know what FTP server software is that? So that I can report this to the vendor.

Anyway, you might be able to workaround this using:
SessionOptions.AddRawSettings("FtpUseMlsd", "1");
This sets Use MLSD command for directory listing option to Off.
https://winscp.net/eng/docs/ui_login_ftp

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codenat
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Re: Can't get attributes of file '/'.

martin wrote:

It looks like a bug in the FTP server.
...
Do you know what FTP server software is that? So that I can report this to the vendor.
Thanks for your quick response! IPSwitch File Transfer WS_FTP Server is what it uses.

martin wrote:

Anyway, you might be able to workaround this using:
SessionOptions.AddRawSettings("FtpUseMlsd", "1");
As of 15.04.16, it ran again with the addition of the above line of code. Received a similar error once again and the file did not get transferred. I am attaching the log of today's try. Here is the error:
There was a problem in FtpQTS(): WinSCP.SessionRemoteException: Can't get attributes of file '/'. ---> WinSCP.SessionRemoteException: Could not retrieve file information Invalid number of arguments SIZE --- End of inner exception stack trace --- at WinSCP.OperationResultBase.Check() at FTP_Check4Files.FTP_Check4Files.FtpQTS(String localPath, String remotePath)
Description: Log with error from today's run after adding the recommended

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martin
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Re: Can't get attributes of file '/'.

Thanks.
Actually my previous analysis was wrong.
It's a bug in WinSCP:
https://winscp.net/tracker/1314

I'm sending you an email with a development version of WinSCP to address you have used to register on this forum.

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codenat
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Re: Can't get attributes of file '/'.

Well, unfortunately, the new .dll and .exe didn't seem to work.
Attached is the log file.
Description: 12:05 attempt at FTPing a file.

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ahylton
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Same issue in .NET

I'm using the .NET assembly. I'm facing this same error when I'm trying to download from the root directory (\).

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martin
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Re: Same issue in .NET

ahylton wrote:

I'm using the .NET assembly. I'm facing this same error when I'm trying to download from the root directory (\).
Well, it should be /, not \. If this does not help, please attach a full session log file showing the problem (using the latest version of WinSCP).

To generate the session log file, set Session.SessionLogPath. Submit the log with your post as an attachment. Note that passwords and passphrases not stored in the log. You may want to remove other data you consider sensitive though, such as host names, IP addresses, account names or file names (unless they are relevant to the problem). If you do not want to post the log publicly, you can mark the attachment as private.

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