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From "Arno Unkrig (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-508) Add support for FTP proxies
Date Wed, 05 Jun 2013 10:41:20 GMT

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

Arno Unkrig commented on NET-508:
---------------------------------

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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