You left out a simple example or two on how to specify what you
will allow. So, Allow me =)
my $file = $cgi->param( 'file' );
my $data;
#
# One way
#
$file =~ s#[^A-Z0-9a-z.]+##g; #strip down to alphanum and period
# can change the meaning of what people post.
$file =~ m#(.*)#; #evil evil evil if you haven't striped.
$data = $1 || ""; #not really necessary to have alternate, nice tho.
#
# Alternate way
#
$file =~ m#([A-Z0-9a-z.]+)#; #grab first good chunk.
# can potentially ignore a lot of data and boggle the user
$data = $1 | ""; #you really want this now, match can fail.
#
# My "best" way
#
die "Eeeek! Evil data sent to the 'file' parameter!\n"
if ($file =~ m#[^A-Z0-9a-z.]#);
#now use the first method above to detaint anyway...
--
$you = new YOU;
honk() if $you->love(perl)
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Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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