#!/usr/bin/perl

##########################################################################
##																		##
##							  The Executer								##
##							  ------------								##
##					   by Jimmy (wordx@hotmail.com)						##
##						http://www.smartCGIs.com						##
##																		##
##	This is a free script, if anyone sold it to you please contact me.  ##
##  Please DO NOT remove any of the copyrights or links to our site,    ##
##  they keep this CGI free for everyone. Thanks!						##
##																		##
##				     (c) copyright 2000 SmartCGIs.com					##
##########################################################################

##
# This CGI will use the LWP module to grab the html output from any web file (CGI, HTML, etc.)
# on any server and insert it into your own site. If all you want to do is grab the contents of 
# a normal (non-executable) file that is on your server, you only need The Includer. Get it free
# at http://www.smartcgis.com . It has less requirements and is faster.
#
# Tag to use:
# ==========
# Execute CGIs (on your server or externally) with a code like this:
#	<script src="http://yourdomain.com/executer.cgi?http://domain.com/test.cgi"></script>
# With "http://domain.com/test.cgi" being the URL to the file you want to grab.
##

################################
##    Edit the following...   ##
################################

# Store the html data for later use?
# 1 = Yes
# 0 = No
# If this CGI will be run often for the same url/file it is best to have this on.
# Instead of connecting to the same url it will store the html for the next time it is requested.
$backup = "0";

# If you said yes above, how often should the data be updated (in seconds)?
# 1 minute = 60 seconds
# 1 hour  = 3600 seconds
# 1 day = 86400 seconds
# etc...
$bseconds = "60";

# Optional: To keep others from using your CGI to grab content from any site they want,
# you can specify the URLs that are allowed to be grabbed with this CGI:
# (You can only grab files on the following sites...)
# @sites = ('');
# Example: @sites = ('www.smartcgis.com','fr.smartcgis.com','yahoo.com');


################################
## DO NOT edit anything below ##
################################


use LWP::Simple;
print "Content-type: text/html\n\n";

$url = $ENV{'QUERY_STRING'};

if($url eq "") {
print "document.writeln('<font color=red>( <b>Executer Error:</b> No URL provided. )</font>');\n";
exit;
}

if($sites[0] ne "") {
$found = "1";
foreach $site(@sites) {
	if($url =~ /$site/i) { $found = "0"; }
						}
if($found eq "1") { 
print "document.writeln('<font color=red>( <b>Executer Error:</b> $url Not Approved by Admin. )</font>');\n";
exit;
}
}

if($backup eq 1) {
	if(! -e "backup") { mkdir("backup", 0777) || print "document.writeln('<center><font color=red>( Excluder Error: Could not create directory \"backup\" ($!). )</font><br> <small>Powered by <a href=\"http://www.smartcgis.com\" target=\"_blank\">SmartCGIs.com</a></small></center>');"; }
$time = time;
open(DATA,"lastbackup.txt");
$btime = <DATA>;
close(DATA);

	if(($time - $btime) > $bseconds) { &deleteold; }

$eurl = &Encrypt($url,smartcgis,asdfhzxcvnmpoiyk);
	if(-e "backup/$eurl") {
	open(DATA,"backup/$eurl");
	@html = <DATA>;
	close(DATA);
	} else {
	$html = get($url);
	@html = split(/\n/,$html);
	open(DATA,">backup/$eurl");
	print DATA $html;
	close(DATA);
	open(DATA,"backup/$eurl");
	@html = <DATA>;
	close(DATA);
	}

} else {
$html = get($url);
@html = split(/\n/,$html);
}

if($html =~ /<frame/i) { 
print "document.writeln('<font color=red>( <b>Executer Error:</b> Does not work with pages that have frames on them, sorry. )</font>');\n";
exit;
}

$count = 0;
foreach $line(@html) {
$count++;
chomp($line);
$line =~ s/\'/\\\'/g;
print "document.writeln('$line');\n";
}

if($count eq 0) {
print "document.writeln('<font color=red>( <b>Executer Error:</b> Unable to grab data from $url )</font>');\n";
}
# I can't stop you from removing this link to us, but I'd appreciate it if you didn't, this is a free script.
# If you do remove, it'd be nice if you put up some other form of link to SmartCGIs.com on your site, thanks!


sub deleteold {
opendir (DIR, "backup");
@files = grep { // } readdir(DIR);
close (DIR);

foreach $file(@files) { unlink("backup/$file"); }

open(DATA,">lastbackup.txt");
print DATA "$time";
close(DATA);
}



sub Encrypt {
    my ($source,$key,$pub_key) = @_;
    my ($cr,$index,$char,$key_char,$enc_string,$encode,$first,
        $second,$let1,$let2,$encrypted,$escapes) = '';
    $source = &rot13($source); 
    $cr = '·¨ '; 
    $source =~ s/[\n\f]//g; 
    $source =~ s/[\r]/$cr/g; 
    while ( length($key) < length($source) ) { $key .= $key } 
    $key=substr($key,0,length($source)); 
    while ($index < length($source)) { 
        $char = substr($source,$index,1);
        $key_char = substr($key,$index,1);
        $enc_string .= chr(ord($char) ^ ord($key_char));
        $index++;
    }
    for (0..255) { $escapes{chr($_)} = sprintf("%2x", $_); } 
    $index=0;
    while ($index < length($enc_string)) { 
        $char = substr($enc_string,$index,1);
        $encode = $escapes{$char};
        $first = substr($encode,0,1);
        $second = substr($encode,1,1);
        $let1=substr($pub_key, hex($first),1);
        $let2=substr($pub_key, hex($second),1);
        $encrypted .= "$let1$let2";
        $index++;
    }
    return $encrypted;
}

sub Decrypt {
    my ($encrypted, $key, $pub_key) = @_;
    $encrypted =~ s/[\n\r\t\f]//eg; 
    my ($cr,$index,$decode,$decode2,$char,$key_char,$dec_string,$decrypted) = '';
    while ( length($key) < length($encrypted) ) { $key .= $key }
    $key=substr($key,0,length($encrypted)); 
    while ($index < length($encrypted)) {
        $decode = sprintf("%1x", index($pub_key, substr($encrypted,$index,1)));
        $index++;
        $decode2 = sprintf("%1x", index($pub_key, substr($encrypted,$index,1)));
        $index++;
        $dec_string .= chr(hex("$decode$decode2")); 
    }
    $index=0;
    while( $index < length($dec_string) ) { 
        $char = substr($dec_string,$index,1);
        $key_char = substr($key,$index,1);
        $decrypted .= chr(ord($char) ^ ord($key_char));
        $index++;
    }
    $cr = '·¨ '; 
    $decrypted =~ s/$cr/\r/g;
    return &rot13( $decrypted ); 
}

sub rot13{ 
    my $source = shift (@_);
    $source =~ tr /[a-m][n-z]/[n-z][a-m]/; 
    $source =~ tr /[A-M][N-Z]/[N-Z][A-M]/;
    $source = reverse($source);
    return $source;
}