/usr/share/mhonarc/mhnull.pl is in mhonarc 2.6.18-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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## File:
## $Id: mhnull.pl,v 1.8 2003/02/04 23:31:19 ehood Exp $
## Author:
## Earl Hood mhonarc@mhonarc.org
## Description:
## Library defines the null filter routine for MHonArc. Its use
## is for dropping unwanted data from messages.
## Filter routine can be registered with the following:
## <MIMEFILTERS>
## some-type/some-subtype;m2h_null::filter;mhnull.pl
## </MIMEFILTERS>
##---------------------------------------------------------------------------##
## MHonArc -- Internet mail-to-HTML converter
## Copyright (C) 1998,1999 Earl Hood, mhonarc@mhonarc.org
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA
##---------------------------------------------------------------------------##
package m2h_null;
sub filter {
my($fields, $data, $isdecode, $args) = @_;
my($ctype) = $fields->{'content-type'}[0] =~ m%^\s*([\w\-\./]+)%;
my($disp, $nameparm, $raw_name, $html_name) =
readmail::MAILhead_get_disposition($fields, 1);
join("", '<p><tt><<',
($disp ? "$disp: " : ""),
($html_name ? $html_name : $ctype),
'>></tt></p>');
}
##---------------------------------------------------------------------------##
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