idea drought

Netstat can be used to do a lot of things, I usually use it to keep track of how many connections there are to my server. These are my two most used commands

Show the number of connections on your http port

netstat -nta | grep :80 | wc -l

List the top10 ips using the highest number of connections to your server

netstat -atnp -A inet | awk -F " " '{print $5} ' | awk -F ":" '{print $1}' | sort | uniq -c | sort -nr | head -10

If there are some bad offenders in the list, you can ban their ip by using IP tables.

Ban:

sudo iptables -A INPUT -s <IPHERE> -j DROP

Unban:

sudo iptables -D INPUT -s <IPHERE> -j DROP

These are temporary bans, if you want to save them you will need to save the IP tables and restart the IP table service. This is for rhel, fedora and centOS.

sudo service iptables save
sudo service iptables restart

In PHP there is one really cool thing you can do. You can use a variable as a function call. Microsoft created a sort of a similar thing in C#, but it’s not as easy to use.

It’s easier to show you with an example then trying to explain it, so that is what I will do

<?php
  function foo()
  {
    echo "Hello World!";
  }

  $bar = "foo";
  $bar(); // this calls foo()
?>

Neat eh?

This can be used to call different classes depending on the URI. New example for this:

<?php

  $uri = explode('/', $_SERVER['REQUEST_URI']);

  if( is_file($publicClassesPath . "/" . $this->uri[1] . ".php"))
  {
    include_once( $publicClassesPath. "/" . $this->uri[1] . ".php");

    $RunningClass = new $uri[1](); // initiate the class and bind an instance
                                   // to the variable $RunningClass
  }
?>