BBQ in php - Hysoft Wiki - Hysoft

2ch Proxy Blocker on PHP

Outline

1. 1. What this document?
   2. Why this document?
   3. Advantages of using this mod
   4. Disadvantages of using this mod
   5. Implementation code
   6. How to use it

What this document?

This document describes how to implement proxy blocker via 2ch vandal denying service by using PHP.

Why this document?

Before I build up this website, I was an administrator of a certain game fan website.
However, I couldn't administrate it because of my administrative ability. By its lack, of cource, vandalisms were occured.
In order to stop them, I implemented this mod.

Advantages of using this mod

• A lot of proxy servers in the blacklist.
• The blacklist is administrated properly.
• The largest BBS in Japan uses this service.

Disadvantages of using this mod

• Sometimes it denies non-proxy host.
• It is not a completed way to deny vandals.

Implementation code

The implementation code is here:

 <?php
 function isPxy($addr){
  $bbq_deny=implode('.',array_reverse(explode('.', $user->ip)));
  $bbq_return=gethostbyname("$bbq_deny.niku.2ch.net");
  $bbx_return=gethostbyname("$bbq_deny.bbx.2ch.net");
  $return_datas=array("127.0.0.2","127.0.0.3","127.0.0.4");
  return (gethostbyaddr($user->ip) ===$user->ip||array_search($bbq_return,$return_datas)!==FALSE||array_search($bbx_return,$return_datas)!==FALSE);
 }
 ?>

How to use it

When you use that code, you can write like the following:

 <?php
 //implemantation code
 function isPxy($addr){
  $bbq_deny=implode('.',array_reverse(explode('.', $user->ip)));
  $bbq_return=gethostbyname("$bbq_deny.niku.2ch.net");
  $bbx_return=gethostbyname("$bbq_deny.bbx.2ch.net");
  $return_datas=array("127.0.0.2","127.0.0.3","127.0.0.4");
  return (gethostbyaddr($user->ip) ===$user->ip||array_search($bbq_return,$return_datas)!==FALSE||array_search($bbx_return,$return_datas)!==FALSE);
 }
 //check proxy.There is an IPaddress in $ipaddress
 if(isPxy($ipaddress)){
 //Write code when $ipaddress is proxy
 }else{
 //write elese.
 }
 ?>