78 lines
2.5 KiB
PHP
78 lines
2.5 KiB
PHP
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<?php
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class IP
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{
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private static $ip = NULL;
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private static $fp = NULL;
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private static $offset = NULL;
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private static $index = NULL;
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private static $cached = array();
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public static function find($ip)
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{
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if (empty($ip) === TRUE)
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{
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return 'N/A';
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}
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$nip = gethostbyname($ip);
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$ipdot = explode('.', $nip);
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if ($ipdot[0] < 0 || $ipdot[0] > 255 || count($ipdot) !== 4)
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{
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return 'N/A';
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}
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if (isset(self::$cached[$nip]) === TRUE)
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{
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return self::$cached[$nip];
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}
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if (self::$fp === NULL)
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{
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self::init();
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}
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$nip2 = pack('N', ip2long($nip));
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$tmp_offset = (int)$ipdot[0] * 4;
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$start = unpack('Vlen', self::$index[$tmp_offset] . self::$index[$tmp_offset + 1] . self::$index[$tmp_offset + 2] . self::$index[$tmp_offset + 3]);
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$index_offset = $index_length = NULL;
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$max_comp_len = self::$offset['len'] - 1024 - 4;
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for ($start = $start['len'] * 8 + 1024; $start < $max_comp_len; $start += 8)
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{
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if (self::$index[$start] . self::$index[$start + 1] . self::$index[$start + 2] . self::$index[$start + 3] >= $nip2)
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{
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$index_offset = unpack('Vlen', self::$index[$start + 4] . self::$index[$start + 5] . self::$index[$start + 6] . "\x0");
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$index_length = unpack('Clen', self::$index[$start + 7]);
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break;
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}
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}
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if ($index_offset === NULL)
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{
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return 'N/A';
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}
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fseek(self::$fp, self::$offset['len'] + $index_offset['len'] - 1024);
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self::$cached[$nip] = explode("\t", fread(self::$fp, $index_length['len']));
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return self::$cached[$nip];
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}
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private static function init()
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{
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if (self::$fp === NULL)
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{
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self::$ip = new self();
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self::$fp = fopen(__DIR__ . '/17monipdb.dat', 'rb');
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if (self::$fp === FALSE)
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{
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throw new \Exception('Invalid 17monipdb.dat file!');
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}
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self::$offset = unpack('Nlen', fread(self::$fp, 4));
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if (self::$offset['len'] < 4)
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{
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throw new \Exception('Invalid 17monipdb.dat file!');
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}
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self::$index = fread(self::$fp, self::$offset['len'] - 4);
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}
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}
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public function __destruct()
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{
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if (self::$fp !== NULL)
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{
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fclose(self::$fp);
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}
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}
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}
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