php读取qqwry.dat ip地址定位文件的类

<?php
// +----------------------------------------------------------------------
// |
// +----------------------------------------------------------------------
// |
// +----------------------------------------------------------------------
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

// 获取客户端IP地址
function get_client_ip(){
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
$ip = getenv("HTTP_CLIENT_IP");
else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
$ip = getenv("REMOTE_ADDR");
else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
$ip = $_SERVER['REMOTE_ADDR'];
else
$ip = "unknown";
return($ip);
}
//*
//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 = "ip1.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($string)
{
return preg_match('%^(?:
[x09x0Ax0Dx20-x7E] # ASCII
| [xC2-xDF][x80-xBF] # non-overlong 2-byte
| xE0[xA0-xBF][x80-xBF] # excluding overlongs
| [xE1-xECxEExEF][x80-xBF]{2} # straight 3-byte
| xED[x80-x9F][x80-xBF] # excluding surrogates
| xF0[x90-xBF][x80-xBF]{2} # planes 1-3
| [xF1-xF3][x80-xBF]{3} # planes 4-15
| xF4[x80-x8F][x80-xBF]{2} # plane 16
)*$%xs', $string);
}
}
?>

项目地址：https://github.com/Wen1750686723/iplocate.git