Connection is closed by remote server without waiting for client
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Key: FTPSERVER-112
URL: https://issues.apache.org/jira/browse/FTPSERVER-112
Project: FtpServer
Issue Type: Bug
Components: Core
Reporter: Rico Neubauer
FTP-Server is using MinaListener as listener class and the corresponding
MinaFtpResponseOutput to write the replies.
When sending QUIT to the server, a reply "200 Goodbye." is send back and after
that the connection is closed from the server. The problem here is that the
reply is sent asynchronously and the connection is closed before this happen.
MinaFtpResponseOutput#write:
public void write(FtpReply response) throws IOException {
session.write(response);
}
where session is IoSession interface. The following is the javadoc for this
method:
Writes the specified message to remote peer. This operation is asynchronous;
[EMAIL PROTECTED] IoHandler#messageSent(IoSession, Object)} will be invoked
when the message is actually sent to remote peer. You can also wait for the
returned [EMAIL PROTECTED] WriteFuture} if you want to wait for the message
actually written.
And in the end the Apache QUIT impl:
session.resetState();
out.write(FtpReplyUtil.translate(session,FtpReply.REPLY_221_CLOSING_CONTROL_CONNECTION,
"QUIT", null));
connection.getServerContext().getConnectionManager().closeConnection(connection);
Bottom line: Before actually the client receives the reply, the connection is
closed. This is happening with certain FTP clients, e.g. FileZilla:
Command: PWD
Response: 257 "/" is current directory.
Status: Directory listing successful
Command: quit
Error: Disconnected from server
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