Mohammed Abouzeid created NET-733:
-------------------------------------
Summary: Java FTPs client lib connects to the server successfully
but the list of directories is empty with an error with FileZilla servers
Key: NET-733
URL: https://issues.apache.org/jira/browse/NET-733
Project: Commons Net
Issue Type: Bug
Components: FTP
Affects Versions: 3.11.1, 3.9.0
Reporter: Mohammed Abouzeid
Fix For: 3.11.2
I'm using java commons-net client lib to connect to FTPs servers, I can connect
with servers successfully. Still, when calling "ftps.listDirectories()" I get
"0" when connecting with FileZilla servers with errors:
* Error while transferring data: PROT C is not allowed when the control
connection is secure. Use PROT P. -> If didn't use ftps.execPROT("P");
* Error while transferring data: TLS session of data connection not resumed.
-> If did use ftps.execPROT("P");
This issue doesn't occur with all FTPs servers.
I have tried to create FTPs server locally but I have noticed the following
while trying to connect:
* FileZilla server's old version (v0.9.60.0) can connect and can
"ftps.listDirectories()" if "force PROT to encrypt file transfares when using
FTP over TLS" is unchecked.
* FileZilla server's new version (v1.8.2.0) only connects but can't
"getListDirectories()", always empty with the errors I mentioned above.
Please note I have tried the FileZilla client version (v3.67.1) to make sure I
can connect to FTPs servers and explore files/directories without any problems.
// To Connect with FTP/s Servers (but no issue with connection at all)
{code:java}
public FTPConnection(String host, String username, String password, boolean
passive) throws IOException {
if (ftps) {
this.log = Logger.getLogger(host);
this.host = host;
this.clientFtps = new FTPSClient(false);
try {
this.clientFtps.connect(host);
} catch (Exception e) {
log.debug(e.getStackTrace());
}
if (username != null)
try {
if (pasv) {
this.clientFtps.enterLocalPassiveMode();
} else {
this.clientFtps.enterLocalActiveMode();
}
this.clientFtps.login(username, password);
//log.debug(this.clientFtps.getReplyString());
} catch (IOException ex) {
ex.printStackTrace();
}
this.clientFtps.setFileType(FTP.BINARY_FILE_TYPE);
this.clientFtps.setFileTransferMode(FTP.BINARY_FILE_TYPE);
log.debug("the type of ftp file is : " + FTP.BINARY_FILE_TYPE);
} else {
this.host = host;
this.log = Logger.getLogger("ftp://"; + host);
log.debug("ftp://"; + host);
this.client = new FTPClient();
this.client.connect(host);
if (username != null)
try {
this.client.login(username, password);
log.debug(this.client.getReplyString());
} catch (IOException ex) {
ex.printStackTrace();
}
this.client.setFileType(FTP.BINARY_FILE_TYPE);
this.client.setFileTransferMode(FTP.BINARY_FILE_TYPE);
log.debug("the type of ftp file is : " + FTP.BINARY_FILE_TYPE);
if (pasv)
this.client.enterLocalPassiveMode();
else
this.client.enterLocalActiveMode();
}
} {code}
// To explore files/directories (here's the problem)
{code:java}
public String[] dirs() throws IOException {
if (ftps) {
FTPFile[] files = clientFtps.listDirectories();
if (files == null)
return new String[0];
String[] result = new String[files.length];
for (int i = 0; i < result.length; i++)
result[i] = files[i].getName();
return result;
} else {
FTPFile[] files = client.listDirectories();
if (files == null)
return new String[0];
String[] result = new String[files.length];
for (int i = 0; i < result.length; i++)
result[i] = files[i].getName();
return result;
}
} {code}
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