Reload Flood Control

This is a fairly simple hack. I implemented it a couple days ago. And realized
that it had also been requested by scotty back in June.

https://vborg.vbsupport.ru/showthrea...threadid=40297

This hack limits the number of http requests to 1 request per IP address
per second. It works for both registered users as well as guests. If a users
hits the refresh button more than once per second he will be taken to the
error screen. The hack actually terminates the loading process of the page
in the early stages and prevents the server load from going up. I have
tried the refresh flood with and without this hack. And without the hack
I got the server load to go from 0.7 to about 25 with about 30 people logged
on. With the hack in place, the same refresh flood caused the load to go as high
as 1.2.

This hack requires you to create a new template. And it modifies 2 source
files: global.php and showthread.php.

In admin CP add the following template: error_floodreload
Add the following text to the template:

Sorry! The administrator has specified that users can only make one http request every 1 second.

In global.php
Look for the following code:

PHP Code:

if (!$servertoobusy) {
  require('./admin/sessions.php');
} else {
  $session = array();
  $bbuserinfo = array();
} 


Add this code directly above it:

PHP Code:

// Flood control for abusive relaods...
$user_ip=$DB_site->query_first("select host, location, lastactivity from session where host = '".addslashes($REMOTE_ADDR)."' order by lastactivity desc limit 1;");
if($REMOTE_ADDR == $user_ip[host]) {
  global $bbtitle,$logincode,$url,$scriptpath,$bbuserinfo,$session;
  $time_now = time();
  if($time_now == $user_ip[lastactivity]) {
    $DB_site->query("update session set lastactivity='$time_now' where host='".addslashes($REMOTE_ADDR)."' and lastactivity='$user_ip[lastactivity]';");
    $style=$DB_site->query_first("select * from style where userselect = 1;");
    $templatesetid = $style[templatesetid];
    $styleid = $style[styleid];
    $replacementsetid = $style[replacementsetid];
    eval("standarderror(\"".gettemplate("error_floodreload")."\");");
    exit;
  }
} 


In showthread.php
Look for the following code:

PHP Code:

// goto last post
if ($goto=="lastpost") { 


Replace it with

PHP Code:

// goto last post
if ($goto=="lastpost") {

// Flood control for abusive relaods...
  sleep(1); 


In showthread.php
Look for:

PHP Code:

// goto newest post
if ($goto=="newpost") { 


Replace it with:

PHP Code:

// goto newest post
if ($goto=="newpost") {

// Flood control for abusive relaods...
  sleep(1); 


The reason for the 1 second sleeps is to prevent the error screen from popping up when
the user clicks on the goto newest or goto last post arrows in the forum display.
Those 2 calls end up making a second recursive call to showthread.php which ends up
being within the same 1 second interval of the click itself. This way you are fooling
the flood control so that it wont catch the back to back requests.

[Stickers]

Hi,

Can you maybe make this also for 3.6.5?

Best regards
Stickers

[Zachery]

Considering Zzed hasnt posted in 2-3 years maybe requesting it instead of bumping a old thread might have been a good idea

[Stickers]

Good point Zachery