我正在尝试检查 FTP 服务器上是否存在目录。在您说“使用 ListDirectory”或“使用 PrintWorkingDirectory”之前,它们并不总是有效;例如,我测试了是否ftp://网络服务器/日志 ftp://webserver/Logs存在,并且都告诉我它存在,但实际上并不存在。因此,我已经将文件上传到目录,如果成功,则该目录存在。
问题是,以下方法不适用于运行 vsFTPd 2.0.7.2 的 GoDaddy 基于 CentOS 的服务器。与 IIS7.5 上的 Microsoft FTP 服务器配合良好。
因此,我使用 Wireshark 监控流量,并使用 Filezilla 来查看它正在做什么,而我的应用程序无法使其正常工作。唯一的区别是 Filezilla 正在更改工作目录,因为我试图上传带有路径的文件。
我有一种感觉,它与上传到服务器的路径和 Linux 的解释有关,因为它的名字可能有点有趣......:-D 有什么想法受到热烈欢迎吗?
App 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;
}
通过 Wireshark 的 Filezilla 日志
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.
通过 Wireshark 的应用程序日志
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.
如果文件夹不存在,它将创建它们。
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.