- /**
- * 根据IP地址取得城市名称 纯真IP数据库
- * edit: bbs.it-home.org
- */
- function convertip($ip) {
- //IP数据文件路径
- $dat_path = 'QQWry.Dat';
-
- //检查IP地址
- if(!filter_var($ip, FILTER_VALIDATE_IP)) {
- return 'IP Address Error';
- }
- //打开IP数据文件
- if(!$fd = @fopen($dat_path, 'rb')){
- return 'IP date file not exists or access denied';
- }
-
- //分解IP进行运算，得出整形数
- $ipNum = ip2long($ip);
-
- //获取IP数据索引开始和结束位置
- $DataBegin = fread($fd, 4);
- $DataEnd = fread($fd, 4);
- $ipbegin = implode('', unpack('L', $DataBegin));
- if($ipbegin < 0) $ipbegin += pow(2, 32);
- $ipend = implode('', unpack('L', $DataEnd));
- if($ipend < 0) $ipend += pow(2, 32); $ipAllNum = ($ipend - $ipbegin) / 7 + 1; $BeginNum = 0; $EndNum = $ipAllNum; //使用二分查找法从索引记录中搜索匹配的IP记录 while($ip1num>$ipNum || $ip2num<$ipNum) {
- $Middle= intval(($EndNum + $BeginNum) / 2);
-
- //偏移指针到索引位置读取4个字节
- fseek($fd, $ipbegin + 7 * $Middle);
- $ipData1 = fread($fd, 4);
- if(strlen($ipData1) < 4) {
- fclose($fd);
- return 'System Error';
- }
- //提取出来的数据转换成长整形，如果数据是负数则加上2的32次幂
- $ip1num = implode('', unpack('L', $ipData1));
- if($ip1num < 0) $ip1num += pow(2, 32); //提取的长整型数大于我们IP地址则修改结束位置进行下一次循环 if($ip1num > $ipNum) {
- $EndNum = $Middle;
- continue;
- }
-
- //取完上一个索引后取下一个索引
- $DataSeek = fread($fd, 3);
- if(strlen($DataSeek) < 3) {
- fclose($fd);
- return 'System Error';
- }
- $DataSeek = implode('', unpack('L', $DataSeek.chr(0)));
- fseek($fd, $DataSeek);
- $ipData2 = fread($fd, 4);
- if(strlen($ipData2) < 4) {
- fclose($fd);
- return 'System Error';
- }
- $ip2num = implode('', unpack('L', $ipData2));
- if($ip2num < 0) $ip2num += pow(2, 32);
-
- //没找到提示未知
- if($ip2num < $ipNum) {
- if($Middle == $BeginNum) {
- fclose($fd);
- return 'Unknown';
- }
- $BeginNum = $Middle;
- }
- }
-
- //下面的代码读晕了，没读明白，有兴趣的慢慢读
- $ipFlag = fread($fd, 1);
- if($ipFlag == chr(1)) {
- $ipSeek = fread($fd, 3);
- if(strlen($ipSeek) < 3) {
- fclose($fd);
- return 'System Error';
- }
- $ipSeek = implode('', unpack('L', $ipSeek.chr(0)));
- fseek($fd, $ipSeek);
- $ipFlag = fread($fd, 1);
- }
-
- if($ipFlag == chr(2)) {
- $AddrSeek = fread($fd, 3);
- if(strlen($AddrSeek) < 3) {
- fclose($fd);
- return 'System Error';
- }
- $ipFlag = fread($fd, 1);
- if($ipFlag == chr(2)) {
- $AddrSeek2 = fread($fd, 3);
- if(strlen($AddrSeek2) < 3) {
- fclose($fd);
- return 'System Error';
- }
- $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
- fseek($fd, $AddrSeek2);
- } else {
- fseek($fd, -1, SEEK_CUR);
- }
-
- while(($char = fread($fd, 1)) != chr(0))
- $ipAddr2 .= $char;
-
- $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0)));
- fseek($fd, $AddrSeek);
-
- while(($char = fread($fd, 1)) != chr(0))
- $ipAddr1 .= $char;
- } else {
- fseek($fd, -1, SEEK_CUR);
- while(($char = fread($fd, 1)) != chr(0))
- $ipAddr1 .= $char;
-
- $ipFlag = fread($fd, 1);
- if($ipFlag == chr(2)) {
- $AddrSeek2 = fread($fd, 3);
- if(strlen($AddrSeek2) < 3) {
- fclose($fd);
- return 'System Error';
- }
- $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0)));
- fseek($fd, $AddrSeek2);
- } else {
- fseek($fd, -1, SEEK_CUR);
- }
- while(($char = fread($fd, 1)) != chr(0)){
- $ipAddr2 .= $char;
- }
- }
- fclose($fd);
-
- //最后做相应的替换操作后返回结果
- if(preg_match('/http/i', $ipAddr2)) {
- $ipAddr2 = '';
- }
- $ipaddr = "$ipAddr1 $ipAddr2";
- $ipaddr = preg_replace('/CZ88.Net/is', '', $ipaddr);
- $ipaddr = preg_replace('/^s*/is', '', $ipaddr);
- $ipaddr = preg_replace('/s*$/is', '', $ipaddr);
- if(preg_match('/http/i', $ipaddr) || $ipaddr == '') {
- $ipaddr = 'Unknown';
- }
-
- return $ipaddr;
- }
- header("Content-type: text/html; charset=utf-8");
- $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
- if(isset($_GET['q'])){
- $ip = $_GET['q'];
- if(filter_var("http://".$ip,FILTER_VALIDATE_URL,FILTER_FLAG_HOST_REQUIRED)){
- $ip = gethostbyname($ip);
- }
- }
- echo "$ip,".mb_convert_encoding(convertip($ip),"utf-8","gb2312");
-
- ?>
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