262 lines
8.7 KiB
PHP
262 lines
8.7 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace system;
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/**
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* IP 地理位置查询类 修改自 CoolCode.CN
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* 由于使用UTF8编码 如果使用纯真IP地址库的话 需要对返回结果进行编码转换
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* @author liu21st <liu21st@gmail.com>
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*/
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class IpLocation
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{
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/**
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* QQWry.Dat文件指针
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*
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* @var resource
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*/
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private $fp;
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/**
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* 第一条IP记录的偏移地址
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*
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* @var int
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*/
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private int $firstIp;
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/**
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* 最后一条IP记录的偏移地址
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*
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* @var int
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*/
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private int $lastIp;
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/**
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* IP记录的总条数(不包含版本信息记录)
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*
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* @var int
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*/
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private int $totalIp;
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/**
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* 构造函数,打开 QQWry.Dat 文件并初始化类中的信息
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*
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* @param string $filePath
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* @throws \Exception
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*/
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public function __construct(string $filePath = '')
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{
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if (empty($filePath)) {
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$filePath = root_path() . 'extend/conf/ip/qqwry.dat';
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}
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if (!is_file($filePath)) {
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throw new \Exception('文件不存在');
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}
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$this->fp = fopen($filePath, 'rb');
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$this->firstIp = $this->getLong();
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$this->lastIp = $this->getLong();
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$this->totalIp = ($this->lastIp - $this->firstIp) / 7;
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}
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/**
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* 返回读取的长整型数
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*
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* @access private
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* @return int
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*/
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private function getLong(): int
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{
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//将读取的little-endian编码的4个字节转化为长整型数
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$result = unpack('Vlong', fread($this->fp, 4));
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return $result['long'];
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}
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/**
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* 返回读取的3个字节的长整型数
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*
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* @access private
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* @return int
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*/
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private function getLong3(): int
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{
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//将读取的little-endian编码的3个字节转化为长整型数
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$result = unpack('Vlong', fread($this->fp, 3) . chr(0));
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return $result['long'];
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}
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/**
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* 返回压缩后可进行比较的IP地址
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*
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* @access private
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* @param string $ip
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* @return string
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*/
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private function packIp(string $ip): string
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{
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// 将IP地址转化为长整型数,如果在PHP5中,IP地址错误,则返回False,
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// 这时intval将Flase转化为整数-1,之后压缩成big-endian编码的字符串
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return pack('N', intval(ip2long($ip)));
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}
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/**
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* 返回读取的字符串
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*
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* @access private
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* @param string $data
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* @return string
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*/
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private function getString(string $data = ""): string
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{
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$char = fread($this->fp, 1);
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while (ord($char) > 0) {
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// 字符串按照C格式保存,以\0结束
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$data .= $char; // 将读取的字符连接到给定字符串之后
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$char = fread($this->fp, 1);
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}
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return $data;
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}
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/**
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* 返回地区信息
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*
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* @access private
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* @return string
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*/
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private function getArea(): string
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{
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 0: // 没有区域信息
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$area = "";
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break;
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case 1:
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case 2: // 标志字节为1或2,表示区域信息被重定向
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fseek($this->fp, $this->getLong3());
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$area = $this->getString();
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break;
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default: // 否则,表示区域信息没有被重定向
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$area = $this->getString($byte);
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break;
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}
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return $area;
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}
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/**
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* 根据所给 IP 地址或域名返回所在地区信息
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*
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* @access public
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* @param string $ip
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* @return array|null
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*/
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public function getLocation(string $ip = ''): ?array
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{
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if (!$this->fp) {
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return null;
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}
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// 如果数据文件没有被正确打开,则直接返回空
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if (empty($ip)) {
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$ip = request()->ip();
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}
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$location['ip'] = gethostbyname($ip); // 将输入的域名转化为IP地址
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$ip = $this->packIp($location['ip']); // 将输入的IP地址转化为可比较的IP地址
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// 不合法的IP地址会被转化为255.255.255.255
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// 对分搜索
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$l = 0; // 搜索的下边界
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$u = $this->totalIp; // 搜索的上边界
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$findIp = $this->lastIp; // 如果没有找到就返回最后一条IP记录(QQWry.Dat的版本信息)
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while ($l <= $u) {
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// 当上边界小于下边界时,查找失败
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$i = floor(($l + $u) / 2); // 计算近似中间记录
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fseek($this->fp, $this->firstIp + $i * 7);
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$beginIp = strrev(fread($this->fp, 4)); // 获取中间记录的开始IP地址
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// strrev函数在这里的作用是将little-endian的压缩IP地址转化为big-endian的格式
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// 以便用于比较,后面相同。
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if ($ip < $beginIp) { // 用户的IP小于中间记录的开始IP地址时
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$u = $i - 1; // 将搜索的上边界修改为中间记录减一
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} else {
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fseek($this->fp, $this->getLong3());
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$endIp = strrev(fread($this->fp, 4)); // 获取中间记录的结束IP地址
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if ($ip > $endIp) { // 用户的IP大于中间记录的结束IP地址时
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$l = $i + 1; // 将搜索的下边界修改为中间记录加一
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} else {
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// 用户的IP在中间记录的IP范围内时
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$findIp = $this->firstIp + $i * 7;
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break; // 则表示找到结果,退出循环
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}
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}
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}
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//获取查找到的IP地理位置信息
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fseek($this->fp, $findIp);
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$location['beginip'] = long2ip($this->getLong()); // 用户IP所在范围的开始地址
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$offset = $this->getLong3();
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fseek($this->fp, $offset);
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$location['endip'] = long2ip($this->getLong()); // 用户IP所在范围的结束地址
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 1: // 标志字节为1,表示国家和区域信息都被同时重定向
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$countryOffset = $this->getLong3(); // 重定向地址
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fseek($this->fp, $countryOffset);
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$byte = fread($this->fp, 1); // 标志字节
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switch (ord($byte)) {
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case 2: // 标志字节为2,表示国家信息又被重定向
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fseek($this->fp, $this->getLong3());
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$location['country'] = $this->getString();
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fseek($this->fp, $countryOffset + 4);
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$location['area'] = $this->getArea();
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break;
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default: // 否则,表示国家信息没有被重定向
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$location['country'] = $this->getString($byte);
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$location['area'] = $this->getArea();
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break;
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}
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break;
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case 2: // 标志字节为2,表示国家信息被重定向
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fseek($this->fp, $this->getLong3());
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$location['country'] = $this->getString();
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fseek($this->fp, $offset + 8);
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$location['area'] = $this->getArea();
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break;
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default: // 否则,表示国家信息没有被重定向
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$location['country'] = $this->getString($byte);
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$location['area'] = $this->getArea();
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break;
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}
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if (trim($location['country']) == 'CZ88.NET') {
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// CZ88.NET表示没有有效信息
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$location['country'] = '未知';
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}
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if (trim($location['area']) == 'CZ88.NET') {
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$location['area'] = '';
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}
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// 编码转换
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foreach ($location as $key => $item) {
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$location[$key] = iconv('GBK', 'UTF-8', $item);
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}
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return $location;
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}
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/**
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* 析构函数,用于在页面执行结束后自动关闭打开的文件。
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*
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*/
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public function __destruct()
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{
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if ($this->fp) {
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fclose($this->fp);
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}
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$this->fp = 0;
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}
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} |