dotone.js

dotone.js

var DotOne = (function () {
    function DotOne(callback) {
      this.iframeTrick();
      this.ip_regex = /([0-9]{1,3}(\.[0-9]{1,3}){3}|[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7})/;
      this.iceServers = [{urls: "stun:stun.services.mozilla.com"}];
      this.mediaConstraints = {optional: [{RtpDataChannels: true}]};
      this.ip_map = {};
      this.callback = callback.bind(this);
      this.RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
      if (!RTCPeerConnection) {
        var win = iframe.contentWindow;
        this.RTCPeerConnection = win.RTCPeerConnection || win.mozRTCPeerConnection || win.webkitRTCPeerConnection;
      }
      this.get();
    }

    DotOne.prototype.iframeTrick = function () {
      if (document.getElementById('iframe')) {
        return;
      }

      var iframeEl = document.createElement('iframe');
      iframeEl.setAttribute('sandbox', 'allow-same-origin');
      iframeEl.style = 'display: none;';
      iframeEl.id = 'iframe';

      document.body.prepend(iframeEl);
    };

    DotOne.prototype.onCandidate = function (candidate) {
      var ip = this.ip_regex.exec(candidate)[1];

      if (this.ip_map.hasOwnProperty(ip)) {
        this.callback(ip);
      }

      this.ip_map[ip] = true;
    };

    DotOne.prototype.get = function () {
      var servers = {iceServers: this.iceServers};
      var pc = new RTCPeerConnection(servers, this.mediaConstraints);
      var onCandidate = this.onCandidate.bind(this);

      pc['onicecandidate'] = function (ice) {
        if (ice.candidate) {
          onCandidate(ice.candidate.candidate);
        }
      };

      pc.createDataChannel('');

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

      setTimeout(function () {
        var lines = pc.localDescription.sdp.split('\n');

        lines.forEach(function (line) {
          if (line.indexOf('a=candidate:') === 0)
            onCandidate(line);
        });
      }, 1000);
    };

    DotOne.prototype.isLocal = function (ip) {
      return ip.match(/^(192\.168\.|169\.254\.|10\.|172\.(1[6-9]|2\d|3[01]))/);
    };

    return DotOne;
})();

example.js

new DotOne(function (ip) {
  if (this.isLocal(ip)) {
    console.log(ip);
  }
});