Nice! I would like to see what your comments are about 90% of the other 'anti-leech' scripts out there. None of the scripts that I have seen have any taint checking nor 'use strict.'

The problem I want to solve is to stop other sites from using my bandwidth; they can link to my images, or zip files from their site, hence using my bandwidth for downloading files. This is not an 'authorization' issue. I also cannot use an Apache module since I do not have root access because my ISP is rather strict about who gets root access.

These two lines form the 'gatekeeper' aspect of the sub: 

my $remote = remote_host();
return(0) unless grep /$remote/, @$hosts;

[download]
...reverse DNS lookup, I hadn't thought of that. I think what you're getting at is that I have to 'untaint' $remote. 
my $remote = remote_host();
# a domain or an ip can be letters or numbers seperated
# with '.' and there must be at least one char followed
# by a '.' with at least one char following
$remote =~ /([A-Za-z0-9\.]*[A-Za-z0-9]+\.[A-Za-z0-9]+)/;
return (0) unless length($remote) > 3;
return (0) unless grep /$remote/, @$hosts;

[download]
...I haven't tested this yet, but am I on the right track?

--
hiseldl
What time is it? It's Camel Time!

In reply to Re: •Re: anti leech CGI by hiseldl
in thread anti leech CGI by hiseldl

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.