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POc# ftp upload to Linux
 

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    <p>Im trying to check if a directory exists on an FTP server. Before you say "use ListDirectory" or "use PrintWorkingDirectory", they dont always work; for example, I tested if <a href="ftp://webserver/Logs" rel="nofollow">ftp://webserver/Logs</a> existed and both told me it does when it actually doesnt. So Ive gone down the route of uploading a file to the directory and if successful, then the directory exists.</p> <p>The problem is, the below method doesnt work with GoDaddy's CentOS based server's running vsFTPd 2.0.7.2. Works fine with Microsoft FTP server on IIS7.5.</p> <p>So I monitored the traffic with Wireshark and used Filezilla to see what it was doing that my App wasnt to make it work. And the only difference is Filezilla is changing the working directory where as I am trying to upload the file with a path before it.</p> <p>I have a feeling its something to do with the path its uploading to the server and the interpretation by Linux, cause it can be a bit funny with names... :-D Any ideas warmly welcomed?</p> <p><strong>App code</strong></p> <pre><code>private bool DirectoryExists(string d) { bool exists = true; try { string file = "directoryexists.test"; string path = url + homepath + d + "/" + file; //Try to save to the directory req = (FtpWebRequest)WebRequest.Create(path); req.ConnectionGroupName = "conngroup1"; req.Method = WebRequestMethods.Ftp.UploadFile; if (nc != null) req.Credentials = nc; if (cbSSL.Checked) req.EnableSsl = true; req.Timeout = 10000; byte[] fileContents = System.Text.Encoding.Unicode.GetBytes("SAFE TO DELETE"); req.ContentLength = fileContents.Length; Stream s = req.GetRequestStream(); s.Write(fileContents, 0, fileContents.Length); s.Close(); //Delete file if successful req = (FtpWebRequest)WebRequest.Create(path); req.ConnectionGroupName = "conngroup1"; req.Method = WebRequestMethods.Ftp.DeleteFile; if (nc != null) req.Credentials = nc; if (cbSSL.Checked) req.EnableSsl = true; req.Timeout = 10000; res = (FtpWebResponse)req.GetResponse(); res.Close(); } catch (WebException ex) { exists = false; } return exists; } </code></pre> <p><strong>Filezilla log via Wireshark</strong></p> <pre><code>Response: 230 Login successful. Request: CWD /Home/test1 Response: 250 Directory successfully changed. Request: TYPE I Response: 200 Switching to Binary mode. Request: PASV Response: 227 Entering Passive Mode (216,69,186,142,71,209) Request: LIST Response: 150 Here comes the directory listing. FTP Data: 78 bytes Response: 226 Directory send OK. Request: PASV Response: 227 Entering Passive Mode (216,69,186,142,177,1) Request: STOR directoryexists.txt Response: 150 Ok to send data. Response: 226 File receive OK. </code></pre> <p><strong>App log via Wireshark</strong></p> <pre><code>Response: 230 Login successful. Request: OPTS utf8 on Response: 501 Option not understood. Request: PWD Response: 257 "/Home/" Request: PWD Response: 257 "/Home/" Request: TYPE I Response: 200 Switching to Binary mode. Request: PASV Response: 227 Entering Passive Mode (216,69,186,142,217,87) Request: STOR test1/directoryexists.txt Response: 553 Could not create file. </code></pre> <hr> <p>It creates the folders if they dont exist.</p> <pre><code>Response: 230 Login successful. Request: PWD Response: 257 "/Home/" Request: PWD Response: 257 "/Home/" Request: TYPE I Response: 200 Switching to Binary mode. Request: PASV Response: 227 Entering Passive Mode (216,69,186,142,220,60) Request: STOR Logs/directoryexists.txt Response: 553 Could not create file. Request: PWD Response: 257 "/Home/" Request: MKD Logs Response: 257 Create folder operation successful. Request: TYPE I Response: 200 Switching to Binary mode. Request: PASV Response: 227 Entering Passive Mode (216,69,186,142,255,245) Request: STOR Logs/LogFiles/directoryexists.txt Response: 553 Could not create file. Request: PWD Response: 257 "/Home/" Request: MKD Logs/LogFiles Response: 257 Create folder operation successful. </code></pre>
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    1. COGenerally 553 errors are permissions related. I see Wireshark picked up `STOR test1/directoryexists.txt`. Is it possible that you cannot create another nested directory under /Home/ on the FTP server? Some hosting providers limit on how deep you can nest directorie, so you may /not/be/allowed/to/put/a/folder/this/deep or even /this/deep. According to wireshark you are in /Home/ so you should simply just be able to execute `STOR directoryexists.txt`.
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      1. USBryan Crosby
    2. CO@Bryan: Thanks for your thoughts but just tested that and worked fine. `Response: 257 "/Home/A/B/C/"`
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      1. USChristian
    3. COHave you tried setting `req.Method` to `WebRequestMethods.Ftp.MakeDirectory`, creating the directory, and then trying to upload the file?
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      1. USBryan Crosby
 

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