?? fig19_03.pl
字號(hào):
#!perl
# Figure 19.3: fig19_03.pl
# Another potential security risk: backticks.
use warnings;
use strict;
use CGI qw( :standard );
print( header(), start_html( "Backtick security issue" ) );
my $cgi = new CGI();
unless ( $cgi->param() ) {
print( "Type some text, then press Enter",
" and I will display it for you." );
my $form = new CGI();
print( $form->startform(),
$form->textfield( 'words', '', 20 ),
$form->endform() );
}
else {
my $words = $cgi->param( 'words' );
print( "You entered: $words.", br() );
print( "Attempting to execute: $words.", br() );
my @matches = `$words`;
if ( @matches ) {
print( br(), join( br(), @matches ) );
}
else {
print( "'$words' was not a shell command.", br() );
}
}
print( end_html() );
###########################################################################
# (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall. #
# All Rights Reserved. #
# #
# DISCLAIMER: The authors and publisher of this book have used their #
# best efforts in preparing the book. These efforts include the #
# development, research, and testing of the theories and programs #
# to determine their effectiveness. The authors and publisher make #
# no warranty of any kind, expressed or implied, with regard to these #
# programs or to the documentation contained in these books. The authors #
# and publisher shall not be liable in any event for incidental or #
# consequential damages in connection with, or arising out of, the #
# furnishing, performance, or use of these programs. #
###########################################################################
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