The function of automatically blocking the other party's IP when being attacked by CC or DDOS

WBOY
Release: 2016-07-25 08:45:55
Original
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This function is used to count how many times each visitor has visited in a short period of time. If the number of visits exceeds the limit, it returns TRUE. After that, you can use PHP to call linux's iptables to perform the blocking operation. I have used several I have actually tested DDOS tools and the results are very good.
By the way, I use files in the code to record the visitor IP and time. It is best not to use a database (and don’t be clever and save it in the session) , in addition, it is best to put this file on the SSD hard drive. I won’t go into details for the reason. I think everyone knows it.
    /**
  1. Prevent malicious reorganization on the client side
  2. Usage:
  3. $isf5=Fun::isf5();
  4. Return:
  5. Return bool[true: the other party is maliciously reorganizing; false: normal access]
  6. /**/
  7. public static function isf5(){
  8. $_f=Run.'_isf5';
  9. if(!file_exists($_f)){
  10. file_put_contents($_f,serialize(array) ()),LOCK_EX);
  11. chmod($_f,0777);
  12. }
  13. $arr=unserialize(file_get_contents($_f));
  14. $arr=(!is_array($arr)) ? array() : $arr ;
  15. //Clear out users who visited 10 seconds ago
  16. foreach($arr as $k=>$v){
  17. if($_ENV['now']-$v['t'] >= 10 ){
  18. unset($arr[$k]);
  19. }
  20. }
  21. $ip='_'.(self::cur('ip'));
  22. if(!isset($arr[$ip ])){
  23. $arr[$ip]['n']=1; //The number of connections within 1s
  24. $arr[$ip]['t']=$_ENV['now']; // Time of the first access
  25. file_put_contents($_f,serialize($arr),LOCK_EX);
  26. chmod($_f,0777);
  27. unset($_f,$arr,$ip);
  28. return FALSE;
  29. }else {
  30. if(!isset($arr[$ip]['t']) or !is_numeric($arr[$ip]['t'])){
  31. unset($arr[$ip]);
  32. file_put_contents ($_f,serialize($arr),LOCK_EX);
  33. chmod($_f,0777);
  34. unset($_f,$arr,$ip);
  35. return FALSE;
  36. }
  37. if(($_ENV['now ']-$arr[$ip]['t']) <= 1){ //If the time since the last access is not more than 1s, only the number of times will be accumulated
  38. $arr[$ip]['n'] +=1;
  39. if($arr[$ip]['n']>=5){
  40. unset($_f,$arr,$ip);
  41. return TRUE;
  42. }else{
  43. file_put_contents($_f ,serialize($arr),LOCK_EX);
  44. chmod($_f,0777);
  45. unset($_f,$arr,$ip);
  46. return FALSE;
  47. }
  48. }else{ //If the distance from the last visit If the time has exceeded 1s, count again
  49. $arr[$ip]['n']=1;
  50. $arr[$ip]['t']=$_ENV['now'];
  51. file_put_contents($_f, serialize($arr),LOCK_EX);
  52. chmod($_f,0777);
  53. unset($_f,$arr,$ip);
  54. return FALSE;
  55. }
  56. }
  57. unset($_f,$arr,$ip );
  58. return FALSE;
  59. }
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DDOS, function

source:php.cn
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