通过JS如何获取IP地址

通过JS获取你真实的外网IP和内网IP，就算开代理也没有用，想想真是太可怕了，还能不能愉快的装逼了！

代码：

//get the IP addresses associated with an account

function getIPs(callback){

    var ip_dups = {};

    //compatibility for firefox and chrome

    var RTCPeerConnection = window.RTCPeerConnection

        || window.mozRTCPeerConnection

        || window.webkitRTCPeerConnection;

    //bypass naive webrtc blocking

    if (!RTCPeerConnection) {

        var iframe = document.createElement('iframe');

        //invalidate content script

        iframe.sandbox = 'allow-same-origin';

        iframe.style.display = 'none';

        document.body.appendChild(iframe);

        var win = iframe.contentWindow;

        window.RTCPeerConnection = win.RTCPeerConnection;

        window.mozRTCPeerConnection = win.mozRTCPeerConnection;

        window.webkitRTCPeerConnection = win.webkitRTCPeerConnection;

        RTCPeerConnection = window.RTCPeerConnection

            || window.mozRTCPeerConnection

            || window.webkitRTCPeerConnection;

    }

    //minimal requirements for data connection

    var mediaConstraints = {

        optional: [{RtpDataChannels: true}]

    };

    //firefox already has a default stun server in about:config

    //    media.peerconnection.default_iceservers =

    //    [{"url": "stun:stun.services.mozilla.com"}]

    var servers = undefined;

    //add same stun server for chrome

    if(window.webkitRTCPeerConnection)

        servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};

    //construct a new RTCPeerConnection

    var pc = new RTCPeerConnection(servers, mediaConstraints);

    //listen for candidate events

    pc.onicecandidate = function(ice){

        //skip non-candidate events

        if(ice.candidate){

            //match just the IP address

            var ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3})/

            var ip_addr = ip_regex.exec(ice.candidate.candidate)[1];

            //remove duplicates

            if(ip_dups[ip_addr] === undefined)

                callback(ip_addr);

            ip_dups[ip_addr] = true;

        }

    };

    //create a bogus data channel

    pc.createDataChannel("");

    //create an offer sdp

    pc.createOffer(function(result){

        //trigger the stun server request

        pc.setLocalDescription(result, function(){}, function(){});

    }, function(){});

}

//Test: Print the IP addresses into the console

getIPs(function(ip){console.log(ip);});

因为Firefox和Chrome支持WebRTC，可以向STUN服务器请求，返回内外网IP，不同于XMLHttpRequest请求，STUN请求开发者工具当中看不到网络请求的。

解决办法

那我们有没有办法继续装逼呢？答案是肯定的。我们可以关闭WebRTC。

Chrome

安装插件 https://chrome.google.com/webstore/detail/webrtc-block/nphkkbaidamjmhfanlpblblcadhfbkdm?hl=en

无法下载的一定是你上网姿势不科学。

Firefox

用 media.peerconnection.enabled 禁用。