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Re: Unexpected "text/plain" output with cgi

by enoch (Chaplain)
on Nov 13, 2002 at 17:48 UTC ( #212645=note: print w/replies, xml ) Need Help??


in reply to Unexpected "text/plain" output with cgi

Since no one has pointed it out, yet, you really really, really do not want to do: 
if ($page) { &$page; }

[download]
What if someone (and, don't do this) passed in the URL http://www.robotskull.com/cgi-bin/index.cgi?page=kittens;`rm -rf /etc` (or worse). A better way would be to: 
if($page)
{
    SWITCH:
    {
        &kitten, last SWITCH if($page eq 'kitten');
        &foo, last SWITCH if($page eq 'foo');
        &bar, last SWITCH if($page eq 'bar');
        .
        .
        .
        print STDERR "invalid CGI parameter", last SWITCH;
    }
        
}

[download]

Enoch

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