Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Special Characters

Posted on 1998-12-11
1
Medium Priority
?
242 Views
Last Modified: 2010-03-05
I have a form created using CGI
http://www.regsoft.com/cgi-bin/cd_purchase.pl?6364=100

If any of the following special charactes ("|",";","*","`","<",">") are put into any of the fields and the submit button is hit - the script that gets executed pukes.

I put some code in to try to trap it :

###########################
# Check for special Chars #
###########################

@specialchars=("|",";","*","`","<",">");
foreach $char (@specialchars)
{
   if (($FORM{'companyname'} =~ \$char)) { &badchar('Company Name',"$char");last;}
   if (($FORM{'billingname'} =~ \$char)) { &badchar('Name',"$char") ;last;}
   if (($FORM{'billingaddress'} =~ \$char)) { &badchar('Address',"$char") ;last;}
   if (($FORM{'billingaddress2'} =~ \$char)) { &badchar('Address2',"$char") ;last;}
   if (($FORM{'billingcity'} =~ \$char)) { &badchar('City',"$char") ;last;}
   if (($FORM{'billingstate'} =~ \$char)) { &badchar('State',"$char") ;last;}
   if (($FORM{'billingcountry'} =~ \$char)) { &badchar('Country',"$char") ;last;}
   if (($FORM{'billingzip'} =~ \$char)) { &badchar('Zip/Postal Code',"$char") ;last;}
   if (($FORM{'billingphone'} =~ \$char)) { &badchar('Phone Number',"$char") ;last;}
   if (($FORM{'cardtype'} =~ \$char)) { &badchar('Credit Card',"$char") ;last;}
   if (($FORM{'cardnumber'} =~ \$char)) { &badchar('Card Number',"$char") ;last;}
   if (($FORM{'comments'} =~ \$char)) { &badchar('Comments',"$char") ;last;}

}

But it still pukes.  How can I avoid this from happening???



0
Comment
Question by:regsoft
1 Comment
 
LVL 5

Accepted Solution

by:
b2pi earned 200 total points
ID: 1206922
perldoc URI::Escape shows something like

use URI::Escape;
$safe = uri_escape($FORM{comments}, "^A-Za-z909"); # probably overkill, but safe
$unsafe = uri_unescape($safe);

Note that $unsafe is equal to $FORM{comments};
0

Featured Post

[Webinar] Cloud and Mobile-First Strategy

Maybe you’ve fully adopted the cloud since the beginning. Or maybe you started with on-prem resources but are pursuing a “cloud and mobile first” strategy. Getting to that end state has its challenges. Discover how to build out a 100% cloud and mobile IT strategy in this webinar.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I've just discovered very important differences between Windows an Unix formats in Perl,at least 5.xx.. MOST IMPORTANT: Use Unix file format while saving Your script. otherwise it will have ^M s or smth likely weird in the EOL, Then DO NOT use m…
There are many situations when we need to display the data in sorted order. For example: Student details by name or by rank or by total marks etc. If you are working on data driven based projects then you will use sorting techniques very frequently.…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Six Sigma Control Plans

916 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question