reexp ip handle

[alexho]

i am trying to convert symbols into regexp *00 would be .5 in an ip address so
127.0.0.*00 would become 127.0.0.1-5 banning range. not sure if this is feasible i have a substr($buffer, 0, 1)=="r" in a buffer that finds a range and carries out range bans for the user ip if he falls into the range he is banned.

if (stristr($bufferf,"*00")) {

$p=explode(".", $bufferf);
$p=implode(".\\",$p);
$bufferf = str_ireplace("*00", "([0-9]$|[0-9]{2}$|5$)", $p);
}

then i pass it on to a bunch of these

finnaly to

$ipr is ip global
    if (eregi("$bufferf",$ipr)) {//searches regular expression to match ip.
$rangebanned=true;
    }
//banned lalala
          header("location: $bannedredirect");

this might work but it might be a bit screwy i havent tested it yet... nor did i pay attention to regexps.. i may want to implement a better way to manage this processes so that i dont overkill banning

 

[enouwee]

Why don't you use CIDR masks and ip2long()?

<?php

function matchCIDR($address, $ip, $mask)
{
        $mask = 0xffffffff << (32 - $mask);
        return ((ip2long($address) & $mask) == (ip2long($ip) & $mask));
}

?>

The following will match any address in the C-class 127.0.0.0-127.0.0.255:

matchCIDR($addr_to_test, '127.0.0.0', 24);

EDIT: you already asked exactly the same question a while ago...

 

[alexho]

oh.. i forgot this is a little different though looking thru a file i could call this too
matchCIDR($ip, '$loopedip', 24); i guess ill try it out i totally forgot i had asked this before LOL this seems more reliable.
what is mask for 5,10,20,100 or a better question should i use this for every ban?

 

[enouwee]

CIDR works in power-of-two blocks, which would be /29, /28, /27, /25 respectively.

It's all explained in the Wikipedia article.

 

[alexho]

/25 is 127? ranges for blocking, would it ever be needed to block below 24 CIDR. ill stop asking questions i should try it first
what i have now:

		$ipr = $_SERVER['REMOTE_ADDR'];


if(substr($buffer, 0, 1)=="r") {
$bufferf = str_ireplace("r", "", $buffer); 

$p=explode("|", $bufferf);
$ipc=$p[0];
$cidr=$p[1];
$rangebanned=matchCIDR($ipr, $ipc, $cidr); 

//cidrs: 29=8hosts, 28=16hosts, 27=32hosts,26=64hosts, 25=128hosts, 24=256hosts
//http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing#Prefix_aggregation

    /*if (eregi("$bufferf",$ipr)) {//searches regular expression to match ip.
$rangebanned=true;
    }*/
}

i would ban with input 'r127.0.0.1|24'

edit! i tried it with r127.0.0.254|24 it works very well thanks