Quoth Daniel Quinlan on Thu, Jan 07, 1999:
> hi,
Umm, where have I heard your name? FHS?
> I have several sites who are screaming for some way to prevent their users
> from receiving exe's and the like as attachments in email.
> Something that stood infront of the MTA and acted as a configurable filter would
> be ideal.
Usually it is done to limit the message size, and exim has such
options. But if you really care for MIME, I believe that some
combination of perl and/or metamail will work fine. Make it your
system filter.
> being able to do things like decode all attachments and inspect them would be
> terrific.
Yup, metamail + perl. Or no metamail, perl alone is powerful
enough. Something like:
if (/^Content-Type:\s+multipart\/\w+;\s+boundary=(.*)$/) {
$bound = $1;
}
And:
if (/^\-\-$bound/) { # I'm not sure about this part,
# check RFCs
# Start processing
# ...
if (/^Content-Type:\s+(\w+)\/(\w+); charset=(.*)/) {
$one = $1; # Don't know the official names
$two = $2; # of those two.
$charset = $3;
}
# ...
}
Vadik.
--
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