php防止ddos,dns,集群攻击的实现代码

2. /**
3. * 防止ddos、dns、集群等攻击
4. * edit bbs.it-home.org
5. */
6. //查询禁止IP
7. $ip =$_SERVER['REMOTE_ADDR'];
8. $fileht=".htaccess2";
9. if(!file_exists($fileht))
10. file_put_contents($fileht,"");
11. $filehtarr=@file($fileht);
12. if(in_array($ip."\r\n",$filehtarr))
13. die("Warning:"."
    "."Your IP address are forbided by some reason, IF you have any question Pls emill to [e-mail]!");
14. //加入禁止IP
15. $time=time();
16. $fileforbid="log/forbidchk.dat";
17. if(file_exists($fileforbid)) {
18. if($time-filemtime($fileforbid)>60)
19. unlink($fileforbid);
20. else {
21. $fileforbidarr=@file($fileforbid);
22. if($ip==substr($fileforbidarr[0],0,strlen($ip))) {
23. if($time-substr($fileforbidarr[1],0,strlen($time))>600)
24. unlink($fileforbid);
25. elseif($fileforbidarr[2]>600) {
26. file_put_contents($fileht,$ip."\r\n",FILE_APPEND);
27. unlink($fileforbid);
28. } else {
29. $fileforbidarr[2]++;
30. file_put_contents($fileforbid,$fileforbidarr);
31. }
32. }
33. }
34. }
35. //防刷新
36. $str="";
37. $file="log/ipdate.dat";
38. if(!file_exists("log")&&!is_dir("log"))
39. mkdir("log",0777);
40. if(!file_exists($file))
41. file_put_contents($file,"");
42. $allowTime = 120;//防刷新时间
43. $allowNum=10;//防刷新次数
44. $uri=$_SERVER['REQUEST_URI'];
45. $checkip=md5($ip);
46. $checkuri=md5($uri);
47. $yesno=true;
48. $ipdate=@file($file);
49. foreach($ipdate as $k=>$v) {
50. $iptem=substr($v,0,32);
51. $uritem=substr($v,32,32);
52. $timetem=substr($v,64,10);
53. $numtem=substr($v,74);
54. if($time-$timetemif($iptem!=$checkip)
55. $str.=$v;
56. else {
57. $yesno=false;
58. if($uritem!=$checkuri)
59. $str.=$iptem.$checkuri.$time."1\r\n";
60. elseif($numtem$str.=$iptem.$uritem.$timetem.($numtem+1)."\r\n";
61. else {
62. if(!file_exists($fileforbid)) {
63. $addforbidarr=array($ip."\r\n",time()."\r\n",1);
64. file_put_contents($fileforbid,$addforbidarr);
65. }
66. file_put_contents("log/forbided_ip.log",$ip."--".date("Y-m-d H:i:s",time())."--".$uri."\r\n",FILE_APPEND);
67. $timepass=$timetem+$allowTime-$time;
68. die("Warning:"."
    "."Sorry,you are forbided by refreshing frequently too much, Pls wait for ".$timepass." seconds to continue!");
69. }
70. }
71. }
72. }
73. if($yesno) $str.=$checkip.$checkuri.$time."1\r\n";
74. file_put_contents($file,$str);
75. ?>

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