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From "Arno Unkrig (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (NET-508) Add support for FTP proxies
Date Thu, 06 Jun 2013 06:48:21 GMT

    [ https://issues.apache.org/jira/browse/NET-508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675787#comment-13675787
] 

Arno Unkrig edited comment on NET-508 at 6/6/13 6:48 AM:
---------------------------------------------------------

COMMONS-NET's FTPHTTPClient does NOT work with the McAfee FTP proxy: The client does not receive
the ftp server's greeting message and thus hangs forever. Obviously McAfee expects the CLIENT
to be the first to send data, which is not the case for the FTP protocol. I'd consider McAfee's
behavior a bug.
                
      was (Author: aunkrig):
    COMMONS-NET's FTPHTTPClient does NOT work in my environment: The client does not receive
the ftp server's greeting message and thus hangs forever.
                  
> Add support for FTP proxies
> ---------------------------
>
>                 Key: NET-508
>                 URL: https://issues.apache.org/jira/browse/NET-508
>             Project: Commons Net
>          Issue Type: Improvement
>          Components: FTP
>    Affects Versions: 3.2
>            Reporter: Arno Unkrig
>
> The COMMONS-NET FTP client supports 'FTP over HTTP', but not the other popular FTP proxy
schemes. The article
>  http://www.codeproject.com/Articles/9547/How-Proxy-Server-serves-FTP-clients
> describes some of them, but not very precisely an obviously a bit incorrect.
> I added proxy support for the ANT FTP task in
>  https://svn.code.sf.net/p/loggifier/code/trunk/ant_issue_54883/src/org/apache/tools/ant/taskdefs/optional/net2/FTP2.java
> (search for string "proxyServer"), but I believe that the feature should be implemented
in COMMONS-NET, not in the application, maybe like this:
> {code}
> connectToProxyAndLogin(server, port, userid, password, proxyServer, proxyPort, proxyUserid,
proxyPassword)
> {code}
> The proxy server that I (must) use is
> {noformat}
> 220 McAfee Web Gateway 7.2.0 build 13935
> {noformat}
> , and from experiments it supports the following authentication schemes:
> {noformat}
>  (1) USER pu PASS pp OPEN ftp.acme.com[:port] USER u                     PASS p
>  (2) USER pu PASS pp                          USER u@ftp.acme.com[:port] PASS p
>  (3) USER pu PASS pp SITE ftp.acme.com[:port] USER u                     PASS p
> {noformat}
> I don't know which FTP proxy servers support which of these flavors, but (2) appears
to be the most natural and robust to me.

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