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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-546) NPE because of returning wrong reply-code for openDataConnection while performing MPUT
Date Sat, 29 Nov 2014 03:06:12 GMT

    [ https://issues.apache.org/jira/browse/NET-546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14228611#comment-14228611
] 

Sebb commented on NET-546:
--------------------------

It's not possible for the storeFileStream method to tidy up the command stream itself, because
it does not know when the user has finished writing the data (*)

The Javadoc for storeFileStream states this:

http://commons.apache.org/proper/commons-net/javadocs/api-3.3/org/apache/commons/net/ftp/FTPClient.html#storeFileStream(java.lang.String)

(*) I suppose it would be possible to create a wrapper OutputStream that intercepted the close()
method and called completePendingCommand.
However, the caller would still need to fetch the reply status, so that would not achieve
much.

> NPE because of returning wrong reply-code for openDataConnection while performing MPUT
> --------------------------------------------------------------------------------------
>
>                 Key: NET-546
>                 URL: https://issues.apache.org/jira/browse/NET-546
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.3
>         Environment: Win7, System i (IBM)
>            Reporter: jigsaw
>
> Hi there,
> I'm trying to transfer some data from a Windows 7 system to a System i (IBM server, former
AS/400) by using MPUT.
> So what I am doing in detail:
> I have got a Java client on my Windows 7 machine. There apache commons net is in use.
By using the class FTPClient I connect to an IBM machine (there is installed V7R1).
> These are the commands I fire:
> ftp.login(username, password);
> ftp.setFileType(FTP.BINARY_FILE_TYPE);
> ftp.changeWorkingDirectory(pathname);
> ftp.storeFileStream(remoteFile);
> ftp.disconnect();
> When performing the storeFileStream NULL is returned instead of the output stream. Connection
can be established and everything is working well.
> The problem is that a wrong reply-code is checked during openDataConnection.
> Let me sum up the relevant steps:
> 1. storeFileStream is called
> 2. _storeFileStream(String, String) of FTPClient gets entered
> 3. Then _openDataConnection_ is entered
> 4. Inside this method the active connection mode part is executed
> 5. Using IP4 the port method is called there
> 6. Due to calling the PORT command for FTP a new return message is generated: “200
PORT subcommand request successful.”
> 7. isPositiveCompletion returns true everything is fine up to here
> 8. Going on with the active connection mode part this leads to the sendCommand method
where – after executing the FTP command – the __getReply(boolean) method inside of __getReply()
is called.
> 9. And now the issue: _controlInput_.readLine() returns the PORT message mentioned before
instead of “150 Sending file to [myFile]”. When calling readLine again, the correct message
is returned.
> Why is the message important?
> Getting back to _openDataConnection_ after execution of sendCommand the method FTPReply.isPositivePreliminary
checks the reply-code, which is 200 instead of 150. This will cause a fail and a returning
of NULL as output stream.
> That’s my guess:
> There is missing a call of _controlInput_.readLine() to clear some information messages
before calling a new FTP command.
> Thank you.



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