Example of using php to read innocent ip database_PHP tutorial

Copy code The code is as follows:

/*--------------------------------------------------
ip2address [qqwry.dat]
--------------------------------------------------*/

class ip {
var $fh; //IP数据库文件句柄
var $first; //第一条索引
var $last; //最后一条索引
var $total; //索引总数

//构造函数
function __construct() {
$this->fh = fopen('qqwry.dat', 'rb'); //qqwry.dat文件
  $this->first = $this->getLong4();
  $this->last = $this->getLong4();
  $this->total = ($this->last - $this->first) / 7; //每条索引7字节
 }

 //检查IP合法性
 function checkIp($ip) {
  $arr = explode('.',$ip);
  if(count($arr) !=4 ) {
   return false;
  } else {
   for ($i=0; $i < 4; $i++) {
if ($arr[$i] <'0' || $arr[$i] > '255') {
     return false;
    }
   }
  }
  return true;
 }

 function getLong4() {
  //读取little-endian编码的4个字节转化为长整型数
  $result = unpack('Vlong', fread($this->fh, 4));
  return $result['long'];
 }

 function getLong3() {
  //读取little-endian编码的3个字节转化为长整型数
  $result = unpack('Vlong', fread($this->fh, 3).chr(0));
  return $result['long'];
 }

 //查询信息
 function getInfo($data = "") {
  $char = fread($this->fh, 1);
  while (ord($char) != 0) { //国家地区信息以0结束
   $data .= $char;
   $char = fread($this->fh, 1);
  }
  return $data;
 }

 //查询地区信息
 function getArea() {
  $byte = fread($this->fh, 1); //标志字节
  switch (ord($byte)) {
   case 0: $area = ''; break; //没有地区信息
   case 1: //地区被重定向
    fseek($this->fh, $this->getLong3());
    $area = $this->getInfo(); break;
   case 2: //地区被重定向
   fseek($this->fh, $this->getLong3());
   $area = $this->getInfo(); break;
   default: $area = $this->getInfo($byte);  break; //地区没有被重定向
  }
  return $area;
 }

 function ip2addr($ip) {
  if(!$this -> checkIp($ip)){
   return false;
  }

  $ip = pack('N', intval(ip2long($ip)));

  //二分查找
  $l = 0;
  $r = $this->total;

  while($l <= $r) {
$m = floor(($l + $r) / 2); //计算中间索引
fseek($this->fh, $this->first + $m * 7);
   $beginip = strrev(fread($this->fh, 4)); //中间索引的开始IP地址
   fseek($this->fh, $this->getLong3());
   $endip = strrev(fread($this->fh, 4)); //中间索引的结束IP地址

   if ($ip < $beginip) { //用户的IP小于中间索引的开始IP地址时
$r = $m - 1;
} else {
if ($ip > $endip) { //用户的IP大于中间索引的结束IP地址时
     $l = $m + 1;
    } else { //用户IP在中间索引的IP范围内时
     $findip = $this->first + $m * 7;
     break;
    }
   }
  }

//Query country and region information
fseek($this->fh, $findip);
$location['beginip'] = long2ip($this->getLong4()); // The starting address of the user IP range
$offset = $this->getlong3();
fseek($this->fh, $offset);
$location['endip'] = long2ip ($this->getLong4()); //End address of the range where the user IP is located
$byte = fread($this->fh, 1); //Flag byte
switch (ord( $byte)) {
case 1: //Country and regional information are redirected
$countryOffset = $this->getLong3(); //Redirect address
fseek($this-> ;fh, $countryOffset);
$byte = fread($this->fh, 1); //Flag byte
switch (ord($byte)) {
case 2: // Country information is redirected twice
fseek($this->fh, $this->getLong3());
$location['country'] = $this->getInfo();
fseek($this->fh, $countryOffset + 4);
$location['area'] = $this->getArea();
break;
default: //Country The information is not redirected twice
$location['country'] = $this->getInfo($byte);
$location['area'] = $this->getArea();
break;
}
break;

case 2: //Country information is redirected
fseek($this->fh, $this->getLong3());
$location['country'] = $this-> ;getInfo();
fseek($this->fh, $offset + 8);
$location['area'] = $this->getArea();
break;

default: //Country information is not redirected
$location['country'] = $this->getInfo($byte);
$location['area'] = $this-> ;getArea();
break;
}

//gb2312 to utf-8 (remove CZ88.NET displayed when there is no information)
foreach ($location as $k => $v) {
$location[$k] = str_replace( 'CZ88.NET','',iconv('gb2312', 'utf-8', $v));
}

return $location;
}

//Destructor
function __destruct() {
fclose($this->fh);
}
}

$ip = new ip();
$addr = $ip -> ip2addr('IP address');
print_r($addr);
?>

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