[Mimedefang] MIMEDefang 2.9 Beta 1 is available

[Zhang Lin-bo]

Does this version, together with the MIME-tools patch,
solve the problem of multi-byte characters in the
attachment names?

LB

On Fri, 26 Apr 2002, David F. Skoll wrote:

> Hi,
>
> MIMEDefang 2.9-BETA-1 is at:
>
> http://www.roaringpenguin.com/mimedefang/mimedefang-2.9-BETA-1.tar.gz
>
> DO NOT UPGRADE until you have read this entire e-mail.
>
> The handling of message/rfc822 parts is problematic for MIMEDefang up
> to 2.8.  Consider something like this:
>
>
> --sep1
> Content-Type: message/rfc822; name="bad.exe"
>
> From: <me at here.com>
> To: <you at there.com>
> MIME-Version: 1.0
> Subject: Test
> Content-Type: multipart/mixed; boundary="sep2"
>
> This is a MIME message
>
> --sep2
> Content-Type: text/plain; name="good.txt"
>
> Hello
> --sep2--
>
> --sep1--
>
> The message/rfc822 headers conflict with the headers of the contained
> message.  So I have added a NEW function that you put in your filter
> called "filter_multipart".
>
> The flow now goes like this:
>
> For each LEAF part of the mail message, "filter" is called with four
> arguments: entity, a MIME::Entity object; fname, the suggested
> filename taken from the MIME Content-Disposition header; ext, the file
> extension, and type, the MIME Content-Type value.
>
> For each NON-LEAF part of the mail message, "filter_multipart" is called
> with the same four arguments as filter.  A non-leaf part of a message
> is a part which contains nested parts.  Such a part has no useful
> body, but you should still perform filename checks to check for
> viruses which use malformed MIME to masquerade as non-leaf parts (like
> message/rfc822).  In general, any action you perform in
> filter_multipart applies to the part itself and any contained parts.
>
> For the example above, filter_multipart would be called with a name
> of "bad.exe", and then filter would be called with a name of "good.txt"
>
> See mimedefang-filter(5) for more details.  Also, please read
> the examples/suggested-minimum-filter-for-windows-clients.
>
> Finally, the 2.9-BETA-1 tar file contains a patch against pristine
> MIME-Tools-5.411a which does NOT break any regression tests.
>
> I apologize for the many quick changes.  I promise to slow down
> and think more carefully in the future. :-)
>
> Regards,
>
> David.
>
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>

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