Auth
4 years ago
Cookie
2 years ago
Exception
4 years ago
Proxy
4 years ago
Response
4 years ago
Transport
2 years ago
Utility
2 years ago
Auth.php
4 years ago
Cookie.php
4 years ago
Exception.php
4 years ago
Hooker.php
4 years ago
Hooks.php
2 years ago
IDNAEncoder.php
4 years ago
IPv6.php
4 years ago
IRI.php
2 years ago
Proxy.php
4 years ago
Response.php
4 years ago
SSL.php
4 years ago
Session.php
2 years ago
Transport.php
4 years ago
IPv6.php
191 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Class to validate and to work with IPv6 addresses |
| 4 | * |
| 5 | * @package Requests |
| 6 | * @subpackage Utilities |
| 7 | */ |
| 8 | |
| 9 | /** |
| 10 | * Class to validate and to work with IPv6 addresses |
| 11 | * |
| 12 | * This was originally based on the PEAR class of the same name, but has been |
| 13 | * entirely rewritten. |
| 14 | * |
| 15 | * @package Requests |
| 16 | * @subpackage Utilities |
| 17 | */ |
| 18 | class Requests_IPv6 { |
| 19 | /** |
| 20 | * Uncompresses an IPv6 address |
| 21 | * |
| 22 | * RFC 4291 allows you to compress consecutive zero pieces in an address to |
| 23 | * '::'. This method expects a valid IPv6 address and expands the '::' to |
| 24 | * the required number of zero pieces. |
| 25 | * |
| 26 | * Example: FF01::101 -> FF01:0:0:0:0:0:0:101 |
| 27 | * ::1 -> 0:0:0:0:0:0:0:1 |
| 28 | * |
| 29 | * @author Alexander Merz <alexander.merz@web.de> |
| 30 | * @author elfrink at introweb dot nl |
| 31 | * @author Josh Peck <jmp at joshpeck dot org> |
| 32 | * @copyright 2003-2005 The PHP Group |
| 33 | * @license http://www.opensource.org/licenses/bsd-license.php |
| 34 | * @param string $ip An IPv6 address |
| 35 | * @return string The uncompressed IPv6 address |
| 36 | */ |
| 37 | public static function uncompress($ip) { |
| 38 | if (substr_count($ip, '::') !== 1) { |
| 39 | return $ip; |
| 40 | } |
| 41 | |
| 42 | list($ip1, $ip2) = explode('::', $ip); |
| 43 | $c1 = ($ip1 === '') ? -1 : substr_count($ip1, ':'); |
| 44 | $c2 = ($ip2 === '') ? -1 : substr_count($ip2, ':'); |
| 45 | |
| 46 | if (strpos($ip2, '.') !== false) { |
| 47 | $c2++; |
| 48 | } |
| 49 | // :: |
| 50 | if ($c1 === -1 && $c2 === -1) { |
| 51 | $ip = '0:0:0:0:0:0:0:0'; |
| 52 | } |
| 53 | // ::xxx |
| 54 | elseif ($c1 === -1) { |
| 55 | $fill = str_repeat('0:', 7 - $c2); |
| 56 | $ip = str_replace('::', $fill, $ip); |
| 57 | } |
| 58 | // xxx:: |
| 59 | elseif ($c2 === -1) { |
| 60 | $fill = str_repeat(':0', 7 - $c1); |
| 61 | $ip = str_replace('::', $fill, $ip); |
| 62 | } |
| 63 | // xxx::xxx |
| 64 | else { |
| 65 | $fill = ':' . str_repeat('0:', 6 - $c2 - $c1); |
| 66 | $ip = str_replace('::', $fill, $ip); |
| 67 | } |
| 68 | return $ip; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * Compresses an IPv6 address |
| 73 | * |
| 74 | * RFC 4291 allows you to compress consecutive zero pieces in an address to |
| 75 | * '::'. This method expects a valid IPv6 address and compresses consecutive |
| 76 | * zero pieces to '::'. |
| 77 | * |
| 78 | * Example: FF01:0:0:0:0:0:0:101 -> FF01::101 |
| 79 | * 0:0:0:0:0:0:0:1 -> ::1 |
| 80 | * |
| 81 | * @see uncompress() |
| 82 | * @param string $ip An IPv6 address |
| 83 | * @return string The compressed IPv6 address |
| 84 | */ |
| 85 | public static function compress($ip) { |
| 86 | // Prepare the IP to be compressed |
| 87 | $ip = self::uncompress($ip); |
| 88 | $ip_parts = self::split_v6_v4($ip); |
| 89 | |
| 90 | // Replace all leading zeros |
| 91 | $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]); |
| 92 | |
| 93 | // Find bunches of zeros |
| 94 | if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) { |
| 95 | $max = 0; |
| 96 | $pos = null; |
| 97 | foreach ($matches[0] as $match) { |
| 98 | if (strlen($match[0]) > $max) { |
| 99 | $max = strlen($match[0]); |
| 100 | $pos = $match[1]; |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max); |
| 105 | } |
| 106 | |
| 107 | if ($ip_parts[1] !== '') { |
| 108 | return implode(':', $ip_parts); |
| 109 | } |
| 110 | else { |
| 111 | return $ip_parts[0]; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Splits an IPv6 address into the IPv6 and IPv4 representation parts |
| 117 | * |
| 118 | * RFC 4291 allows you to represent the last two parts of an IPv6 address |
| 119 | * using the standard IPv4 representation |
| 120 | * |
| 121 | * Example: 0:0:0:0:0:0:13.1.68.3 |
| 122 | * 0:0:0:0:0:FFFF:129.144.52.38 |
| 123 | * |
| 124 | * @param string $ip An IPv6 address |
| 125 | * @return string[] [0] contains the IPv6 represented part, and [1] the IPv4 represented part |
| 126 | */ |
| 127 | protected static function split_v6_v4($ip) { |
| 128 | if (strpos($ip, '.') !== false) { |
| 129 | $pos = strrpos($ip, ':'); |
| 130 | $ipv6_part = substr($ip, 0, $pos); |
| 131 | $ipv4_part = substr($ip, $pos + 1); |
| 132 | return array($ipv6_part, $ipv4_part); |
| 133 | } |
| 134 | else { |
| 135 | return array($ip, ''); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | /** |
| 140 | * Checks an IPv6 address |
| 141 | * |
| 142 | * Checks if the given IP is a valid IPv6 address |
| 143 | * |
| 144 | * @param string $ip An IPv6 address |
| 145 | * @return bool true if $ip is a valid IPv6 address |
| 146 | */ |
| 147 | public static function check_ipv6($ip) { |
| 148 | $ip = self::uncompress($ip); |
| 149 | list($ipv6, $ipv4) = self::split_v6_v4($ip); |
| 150 | $ipv6 = explode(':', $ipv6); |
| 151 | $ipv4 = explode('.', $ipv4); |
| 152 | if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) { |
| 153 | foreach ($ipv6 as $ipv6_part) { |
| 154 | // The section can't be empty |
| 155 | if ($ipv6_part === '') { |
| 156 | return false; |
| 157 | } |
| 158 | |
| 159 | // Nor can it be over four characters |
| 160 | if (strlen($ipv6_part) > 4) { |
| 161 | return false; |
| 162 | } |
| 163 | |
| 164 | // Remove leading zeros (this is safe because of the above) |
| 165 | $ipv6_part = ltrim($ipv6_part, '0'); |
| 166 | if ($ipv6_part === '') { |
| 167 | $ipv6_part = '0'; |
| 168 | } |
| 169 | |
| 170 | // Check the value is valid |
| 171 | $value = hexdec($ipv6_part); |
| 172 | if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF) { |
| 173 | return false; |
| 174 | } |
| 175 | } |
| 176 | if (count($ipv4) === 4) { |
| 177 | foreach ($ipv4 as $ipv4_part) { |
| 178 | $value = (int) $ipv4_part; |
| 179 | if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) { |
| 180 | return false; |
| 181 | } |
| 182 | } |
| 183 | } |
| 184 | return true; |
| 185 | } |
| 186 | else { |
| 187 | return false; |
| 188 | } |
| 189 | } |
| 190 | } |
| 191 |