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<?php

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namespace WordfenceLS;

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class Model_IP {

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/**

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* Returns the human-readable representation of a packed binary IP address.

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* @param string $ip

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* @return bool|string

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public static function inet_ntop($ip) {

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if (Model_Crypto::strlen($ip) == 16 && Model_Crypto::substr($ip, 0, 12) == "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff") {

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$ip = Model_Crypto::substr($ip, 12, 4);

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}

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if (self::has_ipv6()) {

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return @inet_ntop($ip);

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}

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// IPv4

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if (Model_Crypto::strlen($ip) === 4) {

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return ord($ip[0]) . '.' . ord($ip[1]) . '.' . ord($ip[2]) . '.' . ord($ip[3]);

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}

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// IPv6

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if (Model_Crypto::strlen($ip) === 16) {

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// IPv4 mapped IPv6

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if (Model_Crypto::substr($ip, 0, 12) == "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff") {

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return "::ffff:" . ord($ip[12]) . '.' . ord($ip[13]) . '.' . ord($ip[14]) . '.' . ord($ip[15]);

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}

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$hex = bin2hex($ip);

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$groups = str_split($hex, 4);

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$in_collapse = false;

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$done_collapse = false;

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foreach ($groups as $index => $group) {

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if ($group == '0000' && !$done_collapse) {

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if ($in_collapse) {

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$groups[$index] = '';

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continue;

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}

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$groups[$index] = ':';

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$in_collapse = true;

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continue;

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}

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if ($in_collapse) {

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$done_collapse = true;

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}

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$groups[$index] = ltrim($groups[$index], '0');

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if (strlen($groups[$index]) === 0) {

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$groups[$index] = '0';

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}

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}

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$ip = join(':', array_filter($groups, 'strlen'));

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$ip = str_replace(':::', '::', $ip);

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return $ip == ':' ? '::' : $ip;

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}

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return false;

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}

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/**

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* Returns the packed binary representation of an IP address from the human readable version.

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* @param string $ip

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* @return string

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public static function inet_pton($ip) {

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if (self::has_ipv6()) {

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$pton = @inet_pton($ip);

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if ($pton === false) {

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return false;

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}

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}

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else {

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if (preg_match('/^(?:\d{1,3}(?:\.|$)){4}/', $ip)) { // IPv4

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$octets = explode('.', $ip);

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$pton = chr($octets[0]) . chr($octets[1]) . chr($octets[2]) . chr($octets[3]);

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}

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else if (preg_match('/^((?:[\da-f]{1,4}(?::|)){0,8})(::)?((?:[\da-f]{1,4}(?::|)){0,8})$/i', $ip)) { // IPv6

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if ($ip === '::') {

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$pton = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";

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}

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else {

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$colon_count = substr_count($ip, ':');

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$dbl_colon_pos = strpos($ip, '::');

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if ($dbl_colon_pos !== false) {

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$ip = str_replace('::', str_repeat(':0000', (($dbl_colon_pos === 0 || $dbl_colon_pos === strlen($ip) - 2) ? 9 : 8) - $colon_count) . ':', $ip);

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$ip = trim($ip, ':');

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}

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$ip_groups = explode(':', $ip);

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$ipv6_bin = '';

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foreach ($ip_groups as $ip_group) {

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$ipv6_bin .= pack('H*', str_pad($ip_group, 4, '0', STR_PAD_LEFT));

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}

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if (Model_Crypto::strlen($ipv6_bin) == 16) {

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$pton = $ipv6_bin;

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}

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else {

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return false;

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}

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}

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}

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else if (preg_match('/^(?:\:(?:\:0{1,4}){0,4}\:|(?:0{1,4}\:){5})ffff\:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/i', $ip, $matches)) { // IPv4 mapped IPv6

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$octets = explode('.', $matches[1]);

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$pton = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff" . chr($octets[0]) . chr($octets[1]) . chr($octets[2]) . chr($octets[3]);

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}

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else {

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return false;

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}

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}

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$pton = str_pad($pton, 16, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\x00\x00\x00\x00", STR_PAD_LEFT);

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return $pton;

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}

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/**

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* Verify PHP was compiled with IPv6 support.

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* Some hosts appear to not have inet_ntop, and others appear to have inet_ntop but are unable to process IPv6 addresses.

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* @return bool

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public static function has_ipv6() {

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return defined('AF_INET6');

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}

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/**

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* Expands a compressed printable representation of an IPv6 address.

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* @param string $ip

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* @return string

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public static function expand_ipv6_address($ip) {

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$hex = bin2hex(self::inet_pton($ip));

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$ip = substr(preg_replace("/([a-f0-9]{4})/i", "$1:", $hex), 0, -1);

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return $ip;

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}

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/**

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* Returns whether or not the IP is a valid format.

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* @param string $ip

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* @return bool

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public static function is_valid_ip($ip) {

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return filter_var($ip, FILTER_VALIDATE_IP) !== false;

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}

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/**

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* Returns whether or not the range is a valid CIDR range.

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* @param string $range

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* @return bool

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public static function is_valid_cidr_range($range) {

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$components = explode('/', $range);

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if (count($components) != 2) { return false; }

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list($ip, $prefix) = $components;

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if (!self::is_valid_ip($ip)) { return false; }

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if (!preg_match('/^\d+$/', $prefix)) { return false; }

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if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {

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if ($prefix < 0 || $prefix > 32) { return false; }

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}

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else {

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if ($prefix < 1 || $prefix > 128) { return false; }

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}

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return true;

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}

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/**

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* Returns whether or not the IP is in the IPv6-mapped-IPv4 format.

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* @param string $ip

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* @return bool

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public static function is_ipv6_mapped_ipv4($ip) {

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return preg_match('/^(?:\:(?:\:0{1,4}){0,4}\:|(?:0{1,4}\:){5})ffff\:\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/i', $ip) > 0;

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}

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}

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