Hi dear fellow monks,

I know this may be a trivial question, but I'm having some problems of understanding the tainted mode of Perl and how to call external programs/scripts when using it. I'm having a CGI-script collecting the data from the browser and passing it via files/commandline to an external Perl-script, which does some calculations on that stuff.
The external script is called via commandline the following way:

script.pl -v -in <file> -opt1 -opt2 -opt3 <num> -optx

Right now, I'm rendering a string containing all the options (enabled/disabled by the Web-User) called '$shellstring' and call the script the following way:

my $log = `script.pl $shellstring`;

This does not work in tainted mode. I tried several variations of calling the script (using system() etc.) but I'm not able to get this working. The CGI-script tests all data for being valid and not containing illegal characters.

Thanx in advance, Michael

In reply to How to call external scripts from a CGI-script in taint mode? by professa

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.