Date: Tue, 16 Jan 2001 15:10:02 -0800 (PST) From: alo@iki.fi (Antti Louko) To: freebsd-bugs@FreeBSD.org Subject: Re: misc/24048: natd/libalias doesn't always properly modify FTP PORT command Message-ID: <200101162310.f0GNA2W33653@freefall.freebsd.org>
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The following reply was made to PR misc/24048; it has been noted by GNATS.
From: alo@iki.fi (Antti Louko)
To: ru@FreeBSD.org
Cc: bug-followup@FreeBSD.org
Subject: Re: misc/24048: natd/libalias doesn't always properly modify FTP PORT command
Date: Wed, 17 Jan 2001 01:04:45 +0200 (EET)
> natd (actually libalias/alias_db.c) only modifies FTP PORT commands
> if they are immediately in the beginning of a new line.
> This is implemented by having a flag which is set when a CR/LF
> pair is detected. This works well except when PORT command
> happens to be first command in the FTP session.
>
I don't see the major problem with this change, but is this allowed
by FTP protocol specs? (The first command being a PORT command.)
I would guess so.
In RFC959, page 45, there is an example of a client transferring data
between two servers. In that example, the first command to one of the
servers is a PORT command.
Of course one could argue that the authentication has been left out of
the example but I cannot see any place where the authentication would
be required.
Regards,
Antti Louko
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