原生javascript方式获取用户的IP地址

Native javascript way to get user's IP address

本文关键字：IP 地址 用户 获取 javascript 方式 原生      更新时间：2023-09-26

如果没有外部服务或服务器端代码，似乎不可能用纯javascript获得您的IP地址。

我的问题是:为什么语言本身没有实现这个特性?毕竟，浏览器应该知道它的IP地址。

实际上可以使用普通JavaScript 用户的IP地址。WebRTC有一个安全漏洞，可以获取用户的外部甚至内部 (LAN) IP地址。

看看这个GitHub项目:https://github.com/diafygi/webrtc-ips

//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;
    var useWebKit = !!window.webkitRTCPeerConnection;
    //bypass naive webrtc blocking using an iframe
    if(!RTCPeerConnection){
        //NOTE: you need to have an iframe in the page right above the script tag
        //
        //<iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
        //<script>...getIPs called in here...
        //
        var win = iframe.contentWindow;
        RTCPeerConnection = win.RTCPeerConnection
            || win.mozRTCPeerConnection
            || win.webkitRTCPeerConnection;
        useWebKit = !!win.webkitRTCPeerConnection;
    }
    //minimal requirements for data connection
    var mediaConstraints = {
        optional: [{RtpDataChannels: true}]
    };
    var servers = {iceServers: [{urls: "stun:stun.services.mozilla.com"}]};
    //construct a new RTCPeerConnection
    var pc = new RTCPeerConnection(servers, mediaConstraints);
    function handleCandidate(candidate){
        //match just the IP address
        var ip_regex = /([0-9]{1,3}('.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/
        var ip_addr = ip_regex.exec(candidate)[1];
        //remove duplicates
        if(ip_dups[ip_addr] === undefined)
            callback(ip_addr);
        ip_dups[ip_addr] = true;
    }
    //listen for candidate events
    pc.onicecandidate = function(ice){
        //skip non-candidate events
        if(ice.candidate)
            handleCandidate(ice.candidate.candidate);
    };
    //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(){});
    //wait for a while to let everything done
    setTimeout(function(){
        //read candidate info from local description
        var lines = pc.localDescription.sdp.split(''n');
        lines.forEach(function(line){
            if(line.indexOf('a=candidate:') === 0)
                handleCandidate(line);
        });
    }, 1000);
}
//Test: Print the IP addresses into the console
getIPs(function(ip){console.log(ip);});

查看演示:https://diafygi.github.io/webrtc-ips/

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