Shell Programming and Scripting

<?php

exec('/var/www/html/backup.sh');
$hash = "# $_POST[username]\n";
$ip = "-A INPUT -p tcp -m tcp -s $_POST[ipaddress] -d 10.10.105.18 --dport 8080 -j ACCEPT\n";
$myFile = "/etc/sysconfig/iptables.ok";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = "$_POST[username]\n";
$stringData = "$_POST[ipaddress]\n";
fwrite($fh, $hash);
fwrite($fh, $ip);
fclose($fh);
exec('/var/www/html/restore.sh');
 ?>

#!/bin/bash
set -x
dir=/etc/sysconfig/
#file=/etc/sysconfig/iptables
#backup=/etc/sysconfig/iptables.bak
#ok=/etc/sysconfig/iptables.ok

cd $dir
    cp iptables iptables.bak
    sed -e :a -e '$d;N;2,21ba' -e 'P;D' iptables > iptables.ok
    chmod 646 iptables.ok
exit

restore.sh
#!/bin/bash
dir=/etc/sysconfig/
file=/etc/sysconfig/iptables
backup=/etc/sysconfig/iptables.bak
ok=/etc/sysconfig/iptables.ok

mv $ok $file
chmod 644 $file
cat /var/www/html/footer.txt >> $file
rm -rf $ok
exit

// bakup.sh
$bak = "iptables.ok";
$myfile = file("file");
$tail = 21;
$to_get = count($myfile) - $tail;
$mytailedfile = array_slice($myfile,0,$to_get);
$output=implode("",$mytailedfile);
file_put_contents($bak,$output);
chmod($bak,0646);

// restore.sh
rename($bak $myfile);
chmod($myfile,0644);
$string_to_append = file_get_contents("/var/www/html/footer.txt");
file_put_contents($myfile,$string_to_append,FILE_APPEND | LOCK_EX));
unlink($bak);