Ban IP

By Anarchy[MKD] on Jul 26, 2007

This is a short tutorial on how to ban an IP address from your website.

Either create a new .php document in a text editor or add the following php to an existing .php document. (ex. index.php)

Now to explain the code.

<?php - Starts the php tag. Lets the browser know what language you are using.
$ip = getenv('REMOTE_ADDR'); - Gets the users IP address
$blocked = "xx.xx.xx.xx"; - Tells the browser that the "xx.xx.xx.xx" IP is blocked/banned
if (ereg($blocked,$ip)) - If the blocked/banned IP is the same as the users IP, the following echo will be displayed.
{ - Starts a bracket
echo "You Have Been Banned"; - Echos the "You Have Been Banned" line onto the page.
exit(); - Exit so no more content is ouput
} - Ends a bracket
?> - Ends the php tag

<?php
$ip = getenv('REMOTE_ADDR');
$blocked = "xx.xx.xx.xx"; // Replace the x's with the IP address.

if (ereg($blocked,$ip))
{
echo "You Have Been Banned";
exit();
}
?>

'echo "You Have Been Banned";'

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Comments

Joshuaxiong1 - Mar 08, 2009

nice script

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alanhogan - Jan 08, 2008

To be more constructive -- first off thanks for commenting your code and explaining it to n00bs. Secondly, if you want to use regular expressions, the preg_ functions are supposed to be faster/better. Thirdly, try \'/^34\.12\.233\.254/$\' to match one address or \'/^34\.12\.233\.(1|2)?[0-9]{1,2}/$\' to match a range. ^ means \"Beginning of string\" and $ means \"end\" when they are used in the first and last positions ([^6] means any character except 6)

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alanhogan - Jan 08, 2008

This script is incorrect... Won\'t it ban you if your IP is \"89.12.34.20\" and it\'s trying to ban \"189.12.34.206\"? Why not use == instead of ereg? It\'ll be faster anyway. This isn\'t Java; == doesn\'t compare identity in PHP but rather value!

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peterpowell - Aug 16, 2007

i made a script like this - it checked the ip against the ip adresses in ban.txt

try that ;)

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Snipe - Aug 10, 2007

You should make an array so you can block multiple IP\'s

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F*U*R*B*Y* - Jul 27, 2007

and also missing the else { (Dunno if it is necessary but i find it easier to code with) and why not use die(\"You are banned\");

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[M]ike - Jul 26, 2007

And if you do mean \"You haven\'t been banned\" - is that really neccisary? Surely not that many people are going to be banned, therefore it\'s easier to say nothing if they aren\'t. :)

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Hawkee - Jul 26, 2007

Don\'t you mean \"You haven\'t been banned\" after the if-statement and exit?

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