I've been searching the web and playing with my code for a while now and can't find a solution to this problem.

I would like to limit uploads to my site with CGI. I'm setting $CGI::POST_MAX = 1024 * 1024 * 20; for a 20 Mb limit, but when I test it with a 900 Mb file, the upload goes through just fine. I've tried every modification I can think of including moving the $CGI::POST_MAX statement around, changing use CGI; to use CGI qw( :standard ); and updating CGI.pm using CPAN. I now have version 4.38 of CGI.pm installed. I would welcome any ideas to be able to protect my server from DDoS attacks.

Here is my code snippet:

#!/usr/bin/perl -T

my $version = "0.1";

use strict;
use warnings;
use CGI;
use CGI::Carp qw/fatalsToBrowser/;
$CGI::POST_MAX = 1024 * 1024 * 20;  # maximum upload filesize is 20M

$| = 1;

my $q = CGI->new;

print $q->header;
print $q->start_html(-title=>"mysite",
                     -style=>{-src=>'/plasma/style.css'});
print $q->start_multipart_form(-method=>'POST',
                               -action=>'/cgi-bin/start_analysis.cgi')
+;
print $q->filefield(-name=>"uf_core",
                    -size=>20);
print "\tFile type: ";
print $q->popup_menu(-name=>"urt",
                     -values=>['fasta','genbank'],
                     -default=>'fasta');
print "<br><br>";
print qq{<input type="file" name="uf_qry" size="20" multiple="true" />
+};
print "<br>";
print $q->submit(-value=>"ANALYZE!");
print $q->end_multipart_form;
print $q->end_html;

[download]
Thanks!

In reply to CGI.pm POST_MAX not working by adjuvant

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.