209 lines
7.5 KiB
PHP
209 lines
7.5 KiB
PHP
<?php
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/*
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* ip_in_range.php - Function to determine if an IP is located in a
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* specific range as specified via several alternative
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* formats.
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*
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* Network ranges can be specified as:
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* 1. Wildcard format: 1.2.3.*
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* 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
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* 3. Start-End IP format: 1.2.3.0-1.2.3.255
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*
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* Return value BOOLEAN : ip_in_range($ip, $range);
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*
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* Copyright 2008: Paul Gregg <pgregg@pgregg.com>
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* 10 January 2008
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* Version: 1.2
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*
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* Source website: http://www.pgregg.com/projects/php/ip_in_range/
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* Version 1.2
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*
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* This software is Donationware - if you feel you have benefited from
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* the use of this tool then please consider a donation. The value of
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* which is entirely left up to your discretion.
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* http://www.pgregg.com/donate/
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*
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* Please do not remove this header, or source attibution from this file.
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*/
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/*
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* Modified by James Greene <james@cloudflare.com> to include IPV6 support
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* (original version only supported IPV4).
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* 21 May 2012
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*/
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// In order to simplify working with IP addresses (in binary) and their
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// netmasks, it is easier to ensure that the binary strings are padded
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// with zeros out to 32 characters - IP addresses are 32 bit numbers
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function rocket_decbin32($dec) {
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return str_pad(decbin($dec), 32, '0', STR_PAD_LEFT);
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}
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// This function takes 2 arguments, an IP address and a "range" in several
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// different formats.
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// Network ranges can be specified as:
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// 1. Wildcard format: 1.2.3.*
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// 2. CIDR format: 1.2.3/24 OR 1.2.3.4/255.255.255.0
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// 3. Start-End IP format: 1.2.3.0-1.2.3.255
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// The function will return true if the supplied IP is within the range.
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// Note little validation is done on the range inputs - it expects you to
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// use one of the above 3 formats.
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function rocket_ipv4_in_range($ip, $range) {
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if (strpos($range, '/') !== false) {
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// $range is in IP/NETMASK format
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list($range, $netmask) = explode('/', $range, 2);
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if (strpos($netmask, '.') !== false) {
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// $netmask is a 255.255.0.0 format
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$netmask = str_replace('*', '0', $netmask);
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$netmask_dec = ip2long($netmask);
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return ( (ip2long($ip) & $netmask_dec) == (ip2long($range) & $netmask_dec) );
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} else {
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// $netmask is a CIDR size block
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// fix the range argument
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$x = explode('.', $range);
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while(count($x)<4) $x[] = '0';
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list($a,$b,$c,$d) = $x;
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$range = sprintf("%u.%u.%u.%u", empty($a)?'0':$a, empty($b)?'0':$b,empty($c)?'0':$c,empty($d)?'0':$d);
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$range_dec = ip2long($range);
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$ip_dec = ip2long($ip);
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# Strategy 1 - Create the netmask with 'netmask' 1s and then fill it to 32 with 0s
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#$netmask_dec = bindec(str_pad('', $netmask, '1') . str_pad('', 32-$netmask, '0'));
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# Strategy 2 - Use math to create it
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$wildcard_dec = pow(2, (32-$netmask)) - 1;
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$netmask_dec = ~ $wildcard_dec;
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return (($ip_dec & $netmask_dec) == ($range_dec & $netmask_dec));
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}
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} else {
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// range might be 255.255.*.* or 1.2.3.0-1.2.3.255
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if (strpos($range, '*') !==false) { // a.b.*.* format
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// Just convert to A-B format by setting * to 0 for A and 255 for B
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$lower = str_replace('*', '0', $range);
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$upper = str_replace('*', '255', $range);
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$range = "$lower-$upper";
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}
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if (strpos($range, '-')!==false) { // A-B format
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list($lower, $upper) = explode('-', $range, 2);
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$lower_dec = (float)sprintf("%u",ip2long($lower));
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$upper_dec = (float)sprintf("%u",ip2long($upper));
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$ip_dec = (float)sprintf("%u",ip2long($ip));
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return ( ($ip_dec>=$lower_dec) && ($ip_dec<=$upper_dec) );
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}
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return false;
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}
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}
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function rocket_ip2long6($ip) {
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if (substr_count($ip, '::')) {
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$ip = str_replace('::', str_repeat(':0000', 8 - substr_count($ip, ':')) . ':', $ip);
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}
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$ip = explode(':', $ip);
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$r_ip = '';
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foreach ($ip as $v) {
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$r_ip .= str_pad( base_convert( preg_replace("/[^0-9a-fA-F]/", "", $v ), 16, 2 ), 16, 0, STR_PAD_LEFT );
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}
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return base_convert($r_ip, 2, 10);
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}
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// Get the ipv6 full format and return it as a decimal value.
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function get_rocket_ipv6_full($ip) {
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$pieces = explode ("/", $ip, 2);
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$left_piece = $pieces[0];
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$right_piece = null;
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if (count($pieces) > 1) $right_piece = $pieces[1];
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// Extract out the main IP pieces
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$ip_pieces = explode("::", $left_piece, 2);
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$main_ip_piece = $ip_pieces[0];
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$last_ip_piece = "";
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if (count($ip_pieces) > 1) $last_ip_piece = $ip_pieces[1];
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// Pad out the shorthand entries.
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$main_ip_pieces = explode(":", $main_ip_piece);
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foreach($main_ip_pieces as $key=>$val) {
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$main_ip_pieces[$key] = str_pad($main_ip_pieces[$key], 4, "0", STR_PAD_LEFT);
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}
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// Check to see if the last IP block (part after ::) is set
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$last_piece = "";
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$size = count($main_ip_pieces);
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if (trim($last_ip_piece) != "") {
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$last_piece = str_pad($last_ip_piece, 4, "0", STR_PAD_LEFT);
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// Build the full form of the IPV6 address considering the last IP block set
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for ($i = $size; $i < 7; $i++) {
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$main_ip_pieces[$i] = "0000";
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}
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$main_ip_pieces[7] = $last_piece;
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}
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else {
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// Build the full form of the IPV6 address
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for ($i = $size; $i < 8; $i++) {
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$main_ip_pieces[$i] = "0000";
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}
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}
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// Rebuild the final long form IPV6 address
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$final_ip = implode(":", $main_ip_pieces);
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return rocket_ip2long6($final_ip);
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}
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// Determine whether the IPV6 address is within range.
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// $ip is the IPV6 address in decimal format to check if its within the IP range created by the cloudflare IPV6 address, $range_ip.
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// $ip and $range_ip are converted to full IPV6 format.
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// Returns true if the IPV6 address, $ip, is within the range from $range_ip. False otherwise.
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function rocket_ipv6_in_range($ip, $range_ip) {
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$pieces = explode ("/", $range_ip, 2);
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$left_piece = $pieces[0];
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$right_piece = $pieces[1];
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// Extract out the main IP pieces
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$ip_pieces = explode("::", $left_piece, 2);
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$main_ip_piece = $ip_pieces[0];
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$last_ip_piece = $ip_pieces[1];
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// Pad out the shorthand entries.
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$main_ip_pieces = explode(":", $main_ip_piece);
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foreach($main_ip_pieces as $key=>$val) {
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$main_ip_pieces[$key] = str_pad($main_ip_pieces[$key], 4, "0", STR_PAD_LEFT);
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}
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// Create the first and last pieces that will denote the IPV6 range.
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$first = $main_ip_pieces;
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$last = $main_ip_pieces;
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// Check to see if the last IP block (part after ::) is set
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$last_piece = "";
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$size = count($main_ip_pieces);
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if (trim($last_ip_piece) != "") {
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$last_piece = str_pad($last_ip_piece, 4, "0", STR_PAD_LEFT);
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// Build the full form of the IPV6 address considering the last IP block set
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for ($i = $size; $i < 7; $i++) {
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$first[$i] = "0000";
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$last[$i] = "ffff";
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}
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$main_ip_pieces[7] = $last_piece;
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}
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else {
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// Build the full form of the IPV6 address
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for ($i = $size; $i < 8; $i++) {
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$first[$i] = "0000";
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$last[$i] = "ffff";
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}
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}
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// Rebuild the final long form IPV6 address
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$first = rocket_ip2long6(implode(":", $first));
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$last = rocket_ip2long6(implode(":", $last));
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$in_range = ($ip >= $first && $ip <= $last);
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return $in_range;
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}
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