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From "Sebb (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-492) FTPClient.printWorkingDirectory() incorrectly parses certain valid PWD command results
Date Fri, 17 May 2013 14:49:16 GMT

    [ https://issues.apache.org/jira/browse/NET-492?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660764#comment-13660764
] 

Sebb commented on NET-492:
--------------------------

Snapshots are at

https://repository.apache.org/content/groups/snapshots/

as per my comment dated 12/Dec/12 13:22
                
> FTPClient.printWorkingDirectory() incorrectly parses certain valid PWD command results
> --------------------------------------------------------------------------------------
>
>                 Key: NET-492
>                 URL: https://issues.apache.org/jira/browse/NET-492
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.2
>            Reporter: Tomasz Jedrzejewski
>            Priority: Minor
>             Fix For: 3.3
>
>
> The new implementation of FTPClient.printWorkingDirectory() which tries to follow RFC959
is invalid and can return unescaped or invalid path in certain circumstances. According to
the commentary, the author interpreted the RFC that the output is always constructed in the
following way:
> 257<space>"<directory-name>"<space><commentary>
> Where any double quotes within the directory name are doubled.
> First issue: the RFC does not state that the output for PWD looks exactly like this,
but that the reply code is the same, as for MKD. Especially, PWD does not return any commentary,
and VSFTPD server (which I'm trying to talk to) does not print out the terminating space,
but ends up the output on the last double quote. The algorithm uses the following code to
detect the end of the quoted path:
> int end = reply.lastIndexOf("\" ");
> If there is no terminating space, the last double quote cannot be found, and as a result,
the method returns the unescaped directory name:
> "/foo"
> instead of
> /foo
> Second issue: the current implementation would not work in case of the following directory:
> /Foo/Bar" /Joe
> PWD command output:
> 257 "/Foo/Bar"" /Joe"
> Value returned by printWorkingDirectory():
> /Foo/Bar"
> Note to the administrators: the problem has been found in commons-net 3.2 version, but
JIRA claims it is unreleased and does not allow me to choose it.

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