openWRT 路由器 Web 环境 php 脚本获取本机公网 IP,本机IP、网关和DNS,以及本地LAN联结设备

目标: openWRT Web 环境 php 脚本获取本机公网 IP， 以及本机IP、网关和DNS信息

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获取本机公网 IP 地址函数

function getPublicIP() {
    $init = curl_init('http://www.cip.cc');
    curl_setopt($init, CURLOPT_RETURNTRANSFER, true);
    $s_result = curl_exec($init);

    //preg_match_all('/\b\d+\.\d+\.\d+\.\d+/',$a,$matches);
    preg_match('/\b\d+\.\d+\.\d+\.\d+/',$s_result,$matches);
 
    $s_ip = $matches[0];
    return $s_ip;
}

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获取本机本地IP、网关和DNS信息函数

function getMiddleString($input, $start, $end) {
    $s_result = substr($input, strlen($start)+strpos($input, $start),(strlen($input) - strpos($input, $end))*(-1));

    return $s_result;

}

function getLocalNetInfo() {

    $f_network = fopen("/etc/config/network", "r");
    $s_network = fread($f_network,filesize("/etc/config/network"));
    fclose($f_network);

    $s_temp = getMiddleString($s_network,"'lan'","'wan'");
    //echo $_temp . "\n";

    $s_lan_ip = getMiddleString($s_temp,"ipaddr '","option gateway");
    $s_lan_ip = substr($s_lan_ip,0,strpos($s_lan_ip, "'"));
    //echo "lan ipaddr: " . $s_lan_ip;
    //echo "\n";

    $s_gateway = getMiddleString($s_temp,"gateway '","option dns");
    $s_gateway = substr($s_gateway,0,strpos($s_gateway,"'"));
    //echo "gateway: " . $s_gateway;
    //echo "\n";

    $s_dns = substr($s_temp,strpos($s_temp,"dns"));
    $s_dns = substr($s_dns,strpos($s_dns,"'")+1);
    $s_dns = substr($s_dns,0,strpos($s_dns,"'"));
    //echo "dns: " . $s_dns;

    $arr_result = array("ip"=>$s_lan_ip,"gateway"=>$s_gateway,"dns"=>$s_dns);

    return $arr_result;
}

获取本地 LAN 联结设备

function getLanAllDevicesInfo() {
    clearstatcache();     
    $f_arp = fopen("/proc/net/arp", "r");
    $s_arp = fread($f_arp,filesize("/proc/net/arp"));        // 此处 filesize 读取文件的长度为0,错误待查
//    $s_arp = fread($f_arp,1000);    
    fclose($f_arp);
    
    preg_match_all('/\b\d+\.\d+\.\d+\.\d+/',$s_arp,$matches);
    return $matches[0];
}