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- <?php
- // +----------------------------------------------------------------------
- // | Fanwe 方维直播系统
- // +----------------------------------------------------------------------
- // | Copyright (c) 2010 http://www.fanwe.com All rights reserved.
- // +----------------------------------------------------------------------
- class iplocate{
- var $fp;
- var $firstip; //第一条ip索引的偏移地址
- var $lastip; //最后一条ip索引的偏移地址
- var $totalip; //总ip数
- //*
- //构造函数,初始化一些变量
- //$datfile 的值为纯真IP数据库的名子,可自行修改.
- //*
- function iplocate(){
- $datfile = APP_ROOT_PATH."system/extend/ip.dat";
- $this->fp=fopen($datfile,'rb'); //二制方式打开
- $this->firstip = $this->get4b(); //第一条ip索引的绝对偏移地址
- $this->lastip = $this->get4b(); //最后一条ip索引的绝对偏移地址
- $this->totalip =($this->lastip - $this->firstip)/7 ; //ip总数 索引区是定长的7个字节,在此要除以7,
- register_shutdown_function(array($this,"closefp")); //为了兼容php5以下版本,本类没有用析构函数,自动关闭ip库.
- }
- //*
- //关闭ip库
- //*
- function closefp(){
- fclose($this->fp);
- }
- //*
- //读取4个字节并将解压成long的长模式
- //*
- function get4b(){
- $str=@unpack("V",fread($this->fp,4));
- return $str[1];
- }
- //*
- //读取重定向了的偏移地址
- //*
- function getoffset(){
- $str=@unpack("V",fread($this->fp,3).chr(0));
- return $str[1];
- }
- //*
- //读取ip的详细地址信息
- //*
- function getstr(){
- $split=fread($this->fp,1);
- while (ord($split)!=0) {
- $str .=$split;
- $split=fread($this->fp,1);
- }
- return $str;
- }
- //*
- //将ip通过ip2long转成ipv4的互联网地址,再将他压缩成big-endian字节序
- //用来和索引区内的ip地址做比较
- //*
- function iptoint($ip){
- return pack("N",intval(ip2long($ip)));
- }
- //*
- //获取客户端ip地址
- //注意:如果你想要把ip记录到服务器上,请在写库时先检查一下ip的数据是否安全.
- //*
- function getIP() {
- if (getenv('HTTP_CLIENT_IP')) {
- $ip = getenv('HTTP_CLIENT_IP');
- }
- elseif (getenv('HTTP_X_FORWARDED_FOR')) { //获取客户端用代理服务器访问时的真实ip 地址
- $ip = getenv('HTTP_X_FORWARDED_FOR');
- }
- elseif (getenv('HTTP_X_FORWARDED')) {
- $ip = getenv('HTTP_X_FORWARDED');
- }
- elseif (getenv('HTTP_FORWARDED_FOR')) {
- $ip = getenv('HTTP_FORWARDED_FOR');
- }
- elseif (getenv('HTTP_FORWARDED')) {
- $ip = getenv('HTTP_FORWARDED');
- }
- else {
- $ip = $_SERVER['REMOTE_ADDR'];
- }
- return $ip;
- }
- //*
- //获取地址信息
- //*
- function readaddress(){
- $now_offset=ftell($this->fp); //得到当前的指针位址
- $flag=$this->getflag();
- switch (ord($flag)){
- case 0:
- $address="";
- break;
- case 1:
- case 2:
- fseek($this->fp,$this->getoffset());
- $address=$this->getstr();
- break;
- default:
- fseek($this->fp,$now_offset);
- $address=$this->getstr();
- break;
- }
- return $address;
- }
- //*
- //获取标志1或2
- //用来确定地址是否重定向了.
- //*
- function getflag(){
- return fread($this->fp,1);
- }
- //*
- //用二分查找法在索引区内搜索ip
- //*
- function searchip($ip){
- $ip=gethostbyname($ip); //将域名转成ip
- $ip_offset["ip"]=$ip;
- $ip=$this->iptoint($ip); //将ip转换成长整型
- $firstip=0; //搜索的上边界
- $lastip=$this->totalip; //搜索的下边界
- $ipoffset=$this->lastip; //初始化为最后一条ip地址的偏移地址
- while ($firstip <= $lastip){
- $i=floor(($firstip + $lastip) / 2); //计算近似中间记录 floor函数记算给定浮点数小的最大整数,说白了就是四舍五也舍
- fseek($this->fp,$this->firstip + $i * 7); //定位指针到中间记录
- $startip=strrev(fread($this->fp,4)); //读取当前索引区内的开始ip地址,并将其little-endian的字节序转换成big-endian的字节序
- if ($ip < $startip) {
- $lastip=$i - 1;
- }
- else {
- fseek($this->fp,$this->getoffset());
- $endip=strrev(fread($this->fp,4));
- if ($ip > $endip){
- $firstip=$i + 1;
- }
- else {
- $ip_offset["offset"]=$this->firstip + $i * 7;
- break;
- }
- }
- }
- return $ip_offset;
- }
- //*
- //获取ip地址详细信息
- //*
- function getaddress($ip){
- $ip_offset=$this->searchip($ip); //获取ip 在索引区内的绝对编移地址
- $ipoffset=$ip_offset["offset"];
- $address["ip"]=$ip_offset["ip"];
- fseek($this->fp,$ipoffset); //定位到索引区
- $address["startip"]=long2ip($this->get4b()); //索引区内的开始ip 地址
- $address_offset=$this->getoffset(); //获取索引区内ip在ip记录区内的偏移地址
- fseek($this->fp,$address_offset); //定位到记录区内
- $address["endip"]=long2ip($this->get4b()); //记录区内的结束ip 地址
- $flag=$this->getflag(); //读取标志字节
- switch (ord($flag)) {
- case 1: //地区1地区2都重定向
- $address_offset=$this->getoffset(); //读取重定向地址
- fseek($this->fp,$address_offset); //定位指针到重定向的地址
- $flag=$this->getflag(); //读取标志字节
- switch (ord($flag)) {
- case 2: //地区1又一次重定向,
- fseek($this->fp,$this->getoffset());
- $address["area1"]=$this->getstr();
- fseek($this->fp,$address_offset+4); //跳4个字节
- $address["area2"]=$this->readaddress(); //地区2有可能重定向,有可能没有
- break;
- default: //地区1,地区2都没有重定向
- fseek($this->fp,$address_offset); //定位指针到重定向的地址
- $address["area1"]=$this->getstr();
- $address["area2"]=$this->readaddress();
- break;
- }
- break;
- case 2: //地区1重定向 地区2没有重定向
- $address1_offset=$this->getoffset(); //读取重定向地址
- fseek($this->fp,$address1_offset);
- $address["area1"]=$this->getstr();
- fseek($this->fp,$address_offset+8);
- $address["area2"]=$this->readaddress();
- break;
- default: //地区1地区2都没有重定向
- fseek($this->fp,$address_offset+4);
- $address["area1"]=$this->getstr();
- $address["area2"]=$this->readaddress();
- break;
- }
- //*过滤一些无用数据
- if (strpos($address["area1"],"CZ88.NET")!=false){
- $address["area1"]="未知";
- }
- if (strpos($address["area2"],"CZ88.NET")!=false){
- $address["area2"]=" ";
- }
- foreach($address as $k=>$item)
- {
- if(!$this->is_utf8($address[$k]))
- {
- $address[$k] = iconv('gbk','utf-8',$item);
- }
- }
- return $address;
- }
- function is_utf8($string)
- {
- return preg_match('%^(?:
- [\x09\x0A\x0D\x20-\x7E] # ASCII
- | [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
- | \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
- | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte
- | \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
- | \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
- | [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
- | \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
- )*$%xs', $string);
- }
- }
- ?>
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