--- /dev/null
+<?php
+/**
+ * Class to validate and to work with IPv6 addresses
+ *
+ * @package Requests
+ * @subpackage Utilities
+ */
+
+/**
+ * Class to validate and to work with IPv6 addresses
+ *
+ * This was originally based on the PEAR class of the same name, but has been
+ * entirely rewritten.
+ *
+ * @package Requests
+ * @subpackage Utilities
+ */
+class Requests_IPv6 {
+ /**
+ * Uncompresses an IPv6 address
+ *
+ * RFC 4291 allows you to compress consecutive zero pieces in an address to
+ * '::'. This method expects a valid IPv6 address and expands the '::' to
+ * the required number of zero pieces.
+ *
+ * Example: FF01::101 -> FF01:0:0:0:0:0:0:101
+ * ::1 -> 0:0:0:0:0:0:0:1
+ *
+ * @author Alexander Merz <alexander.merz@web.de>
+ * @author elfrink at introweb dot nl
+ * @author Josh Peck <jmp at joshpeck dot org>
+ * @copyright 2003-2005 The PHP Group
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ * @param string $ip An IPv6 address
+ * @return string The uncompressed IPv6 address
+ */
+ public static function uncompress($ip) {
+ if (substr_count($ip, '::') !== 1) {
+ return $ip;
+ }
+
+ list($ip1, $ip2) = explode('::', $ip);
+ $c1 = ($ip1 === '') ? -1 : substr_count($ip1, ':');
+ $c2 = ($ip2 === '') ? -1 : substr_count($ip2, ':');
+
+ if (strpos($ip2, '.') !== false) {
+ $c2++;
+ }
+ // ::
+ if ($c1 === -1 && $c2 === -1) {
+ $ip = '0:0:0:0:0:0:0:0';
+ }
+ // ::xxx
+ else if ($c1 === -1) {
+ $fill = str_repeat('0:', 7 - $c2);
+ $ip = str_replace('::', $fill, $ip);
+ }
+ // xxx::
+ else if ($c2 === -1) {
+ $fill = str_repeat(':0', 7 - $c1);
+ $ip = str_replace('::', $fill, $ip);
+ }
+ // xxx::xxx
+ else {
+ $fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
+ $ip = str_replace('::', $fill, $ip);
+ }
+ return $ip;
+ }
+
+ /**
+ * Compresses an IPv6 address
+ *
+ * RFC 4291 allows you to compress consecutive zero pieces in an address to
+ * '::'. This method expects a valid IPv6 address and compresses consecutive
+ * zero pieces to '::'.
+ *
+ * Example: FF01:0:0:0:0:0:0:101 -> FF01::101
+ * 0:0:0:0:0:0:0:1 -> ::1
+ *
+ * @see uncompress()
+ * @param string $ip An IPv6 address
+ * @return string The compressed IPv6 address
+ */
+ public static function compress($ip) {
+ // Prepare the IP to be compressed
+ $ip = self::uncompress($ip);
+ $ip_parts = self::split_v6_v4($ip);
+
+ // Replace all leading zeros
+ $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]);
+
+ // Find bunches of zeros
+ if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) {
+ $max = 0;
+ $pos = null;
+ foreach ($matches[0] as $match) {
+ if (strlen($match[0]) > $max) {
+ $max = strlen($match[0]);
+ $pos = $match[1];
+ }
+ }
+
+ $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max);
+ }
+
+ if ($ip_parts[1] !== '') {
+ return implode(':', $ip_parts);
+ }
+ else {
+ return $ip_parts[0];
+ }
+ }
+
+ /**
+ * Splits an IPv6 address into the IPv6 and IPv4 representation parts
+ *
+ * RFC 4291 allows you to represent the last two parts of an IPv6 address
+ * using the standard IPv4 representation
+ *
+ * Example: 0:0:0:0:0:0:13.1.68.3
+ * 0:0:0:0:0:FFFF:129.144.52.38
+ *
+ * @param string $ip An IPv6 address
+ * @return string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part
+ */
+ protected static function split_v6_v4($ip) {
+ if (strpos($ip, '.') !== false) {
+ $pos = strrpos($ip, ':');
+ $ipv6_part = substr($ip, 0, $pos);
+ $ipv4_part = substr($ip, $pos + 1);
+ return array($ipv6_part, $ipv4_part);
+ }
+ else {
+ return array($ip, '');
+ }
+ }
+
+ /**
+ * Checks an IPv6 address
+ *
+ * Checks if the given IP is a valid IPv6 address
+ *
+ * @param string $ip An IPv6 address
+ * @return bool true if $ip is a valid IPv6 address
+ */
+ public static function check_ipv6($ip) {
+ $ip = self::uncompress($ip);
+ list($ipv6, $ipv4) = self::split_v6_v4($ip);
+ $ipv6 = explode(':', $ipv6);
+ $ipv4 = explode('.', $ipv4);
+ if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) {
+ foreach ($ipv6 as $ipv6_part) {
+ // The section can't be empty
+ if ($ipv6_part === '') {
+ return false;
+ }
+
+ // Nor can it be over four characters
+ if (strlen($ipv6_part) > 4) {
+ return false;
+ }
+
+ // Remove leading zeros (this is safe because of the above)
+ $ipv6_part = ltrim($ipv6_part, '0');
+ if ($ipv6_part === '') {
+ $ipv6_part = '0';
+ }
+
+ // Check the value is valid
+ $value = hexdec($ipv6_part);
+ if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF) {
+ return false;
+ }
+ }
+ if (count($ipv4) === 4) {
+ foreach ($ipv4 as $ipv4_part) {
+ $value = (int) $ipv4_part;
+ if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) {
+ return false;
+ }
+ }
+ }
+ return true;
+ }
+ else {
+ return false;
+ }
+ }
+}
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