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000247_jaltman2@nyc.rr.com_Fri Apr 23 09:18:58 2004.msg
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Path: newsmaster.cc.columbia.edu!iad-feed.news.verio.net!peer1.stngva01.us.to.verio.net!news.verio.net!news.glorb.com!cyclone1.gnilink.net!gnilink.net!cyclone.rdc-nyc.rr.com!news-out.nyc.rr.com!twister.nyc.rr.com.POSTED!not-for-mail
Message-ID: <40884E7F.7090604@nyc.rr.com>
From: Jeffrey Altman <jaltman2@nyc.rr.com>
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Newsgroups: comp.protocols.kermit.misc
Subject: Re: FTP site-to-site transfers available in Kermit?
References: <c69fsl0vsl@drn.newsguy.com>
In-Reply-To: <c69fsl0vsl@drn.newsguy.com>
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Date: Thu, 22 Apr 2004 22:51:11 GMT
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Xref: newsmaster.cc.columbia.edu comp.protocols.kermit.misc:14964
No, FTP does not support FTP PROXY mode.
This is an insecure operation which has been used for the execution of
Denial of Service Attacks. Please find another way.
Petri wrote:
> Hi everyone, :)
>
> Now that I'm comfortable with interfacing with Kermit from glftpd and connecting
> to other encrypted FTP-servers, I have started looking at the more important
> features requested, like file transfers.
>
> I just recieved a late request for using site-to-site transfers. :/
> The reason is, that glftpd maintains indexes (which the SITE SEARCH command
> uses), and statistics for all transferred traffic.
> If I insert files into the local FTP-folders by other means than using the
> actual FTP-server, the server would need periodic reindexing, and traffic
> statistics would become incorrect.
>
> If available, I would like to use the site-to-site method, by establishing
> control-sessions to both FTP-servers, and instructing them to send files between
> eachother.
>
> This is mentioned in RFC959, section 3.2:
> "It is possible for the user to specify an alternate data port by
> use of the PORT command. The user may want a file dumped on a TAC
> line printer or retrieved from a third party host. In the latter
> case, the user-PI sets up control connections with both
> server-PI's. One server is then told (by an FTP command) to
> "listen" for a connection which the other will initiate. The
> user-PI sends one server-PI a PORT command indicating the data
> port of the other. Finally, both are sent the appropriate
> transfer commands."
>
> Is this feature available in C-Kermit?
>
> If not, I'll have to collect files from the remote hosts to a local temp folder,
> and then do a second session against localhost to insert the files into the
> local site.
> Not a biggie, but if I could avoid it, I would. :)
>
>
> Petri
>
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