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<?php
/*
* ip_in_range.php - Function to determine if an IP is located in a
* specific range as specified via several alternative
* formats.
*
* Network ranges can be specified as:
* 1. Wildcard format: 1.2.3.*
* 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
* 3. Start-End IP format: 1.2.3.0-1.2.3.255
*
* Return value BOOLEAN : ip_in_range($ip, $range);
*
* Copyright 2008: Paul Gregg <pgregg@pgregg.com>
* 10 January 2008
* Version: 1.2
*
* Source website: http://www.pgregg.com/projects/php/ip_in_range/
* Version 1.2
*
* This software is Donationware - if you feel you have benefited from
* the use of this tool then please consider a donation. The value of
* which is entirely left up to your discretion.
* http://www.pgregg.com/donate/
*
* Please do not remove this header, or source attibution from this file.
*/
/*
* Modified by James Greene <james@cloudflare.com> to include IPV6 support
* (original version only supported IPV4).
* 21 May 2012
*/
// decbin32
// In order to simplify working with IP addresses (in binary) and their
// netmasks, it is easier to ensure that the binary strings are padded
// with zeros out to 32 characters - IP addresses are 32 bit numbers
function w3_decbin32 ($dec) {
return str_pad(decbin($dec), 32, '0', STR_PAD_LEFT);
}
// ipv4_in_range
// This function takes 2 arguments, an IP address and a "range" in several
// different formats.
// Network ranges can be specified as:
// 1. Wildcard format: 1.2.3.*
// 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
// 3. Start-End IP format: 1.2.3.0-1.2.3.255
// The function will return true if the supplied IP is within the range.
// Note little validation is done on the range inputs - it expects you to
// use one of the above 3 formats.
function w3_ipv4_in_range($ip, $range) {
if (strpos($range, '/') !== false) {
// $range is in IP/NETMASK format
list($range, $netmask) = explode('/', $range, 2);
if (strpos($netmask, '.') !== false) {
// $netmask is a 255.255.0.0 format
$netmask = str_replace('*', '0', $netmask);
$netmask_dec = ip2long($netmask);
return ( (ip2long($ip) & $netmask_dec) == (ip2long($range) & $netmask_dec) );
} else {
// $netmask is a CIDR size block
// fix the range argument
$x = explode('.', $range);
while(count($x)<4) $x[] = '0';
list($a,$b,$c,$d) = $x;
$range = sprintf("%u.%u.%u.%u", empty($a)?'0':$a, empty($b)?'0':$b,empty($c)?'0':$c,empty($d)?'0':$d);
$range_dec = ip2long($range);
$ip_dec = ip2long($ip);
# Strategy 1 - Create the netmask with 'netmask' 1s and then fill it to 32 with 0s
#$netmask_dec = bindec(str_pad('', $netmask, '1') . str_pad('', 32-$netmask, '0'));
# Strategy 2 - Use math to create it
$wildcard_dec = pow(2, (32-$netmask)) - 1;
$netmask_dec = ~ $wildcard_dec;
return (($ip_dec & $netmask_dec) == ($range_dec & $netmask_dec));
}
} else {
// range might be 255.255.*.* or 1.2.3.0-1.2.3.255
if (strpos($range, '*') !==false) { // a.b.*.* format
// Just convert to A-B format by setting * to 0 for A and 255 for B
$lower = str_replace('*', '0', $range);
$upper = str_replace('*', '255', $range);
$range = "$lower-$upper";
}
if (strpos($range, '-')!==false) { // A-B format
list($lower, $upper) = explode('-', $range, 2);
$lower_dec = (float)sprintf("%u",ip2long($lower));
$upper_dec = (float)sprintf("%u",ip2long($upper));
$ip_dec = (float)sprintf("%u",ip2long($ip));
return ( ($ip_dec>=$lower_dec) && ($ip_dec<=$upper_dec) );
}
return false;
}
}
function w3_ip2long6($ip) {
if (substr_count($ip, '::')) {
$ip = str_replace('::', str_repeat(':0000', 8 - substr_count($ip, ':')) . ':', $ip);
}
$ip = explode(':', $ip);
$r_ip = '';
foreach ($ip as $v) {
$r_ip .= str_pad(base_convert($v, 16, 2), 16, 0, STR_PAD_LEFT);
}
return base_convert($r_ip, 2, 10);
}
// Get the ipv6 full format and return it as a decimal value.
function w3_get_ipv6_full($ip)
{
$pieces = explode ("/", $ip, 2);
$left_piece = $pieces[0];
$right_piece = $pieces[1];
// Extract out the main IP pieces
$ip_pieces = explode("::", $left_piece, 2);
$main_ip_piece = $ip_pieces[0];
$last_ip_piece = $ip_pieces[1];
// Pad out the shorthand entries.
$main_ip_pieces = explode(":", $main_ip_piece);
foreach($main_ip_pieces as $key=>$val) {
$main_ip_pieces[$key] = str_pad($main_ip_pieces[$key], 4, "0", STR_PAD_LEFT);
}
// Check to see if the last IP block (part after ::) is set
$last_piece = "";
$size = count($main_ip_pieces);
if (trim($last_ip_piece) != "") {
$last_piece = str_pad($last_ip_piece, 4, "0", STR_PAD_LEFT);
// Build the full form of the IPV6 address considering the last IP block set
for ($i = $size; $i < 7; $i++) {
$main_ip_pieces[$i] = "0000";
}
$main_ip_pieces[7] = $last_piece;
}
else {
// Build the full form of the IPV6 address
for ($i = $size; $i < 8; $i++) {
$main_ip_pieces[$i] = "0000";
}
}
// Rebuild the final long form IPV6 address
$final_ip = implode(":", $main_ip_pieces);
return w3_ip2long6($final_ip);
}
// Determine whether the IPV6 address is within range.
// $ip is the IPV6 address in decimal format to check if its within the IP range created by the cloudflare IPV6 address, $range_ip.
// $ip and $range_ip are converted to full IPV6 format.
// Returns true if the IPV6 address, $ip, is within the range from $range_ip. False otherwise.
function w3_ipv6_in_range($ip, $range_ip)
{
$pieces = explode ("/", $range_ip, 2);
$left_piece = $pieces[0];
$right_piece = $pieces[1];
// Extract out the main IP pieces
$ip_pieces = explode("::", $left_piece, 2);
$main_ip_piece = $ip_pieces[0];
$last_ip_piece = $ip_pieces[1];
// Pad out the shorthand entries.
$main_ip_pieces = explode(":", $main_ip_piece);
foreach($main_ip_pieces as $key=>$val) {
$main_ip_pieces[$key] = str_pad($main_ip_pieces[$key], 4, "0", STR_PAD_LEFT);
}
// Create the first and last pieces that will denote the IPV6 range.
$first = $main_ip_pieces;
$last = $main_ip_pieces;
// Check to see if the last IP block (part after ::) is set
$last_piece = "";
$size = count($main_ip_pieces);
if (trim($last_ip_piece) != "") {
$last_piece = str_pad($last_ip_piece, 4, "0", STR_PAD_LEFT);
// Build the full form of the IPV6 address considering the last IP block set
for ($i = $size; $i < 7; $i++) {
$first[$i] = "0000";
$last[$i] = "ffff";
}
$main_ip_pieces[7] = $last_piece;
}
else {
// Build the full form of the IPV6 address
for ($i = $size; $i < 8; $i++) {
$first[$i] = "0000";
$last[$i] = "ffff";
}
}
// Rebuild the final long form IPV6 address
$first = w3_ip2long6(implode(":", $first));
$last = w3_ip2long6(implode(":", $last));
$in_range = ($ip >= $first && $ip <= $last);
return $in_range;
}
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