sstelfox/enum_hosts.html

## enum_hosts.html
<html>
<head>
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Anonymous+Pro:400,700|Droid+Sans+Mono|Open+Sans:400,700|Linden+Hill|Quattrocento:400,700|News+Cycle:400,700|Antic+Slab|Cabin+Condensed:400,700">
<style>
  body {
    font-family: 'Open Sans', Helvetica, Arial, FreeSans;
    font-size: 12pt;
    color: #666;
    margin-top: 40px;
    text-align: center;
  }
  #container {
    width: auto;
    display: inline-block;
    max-width: 700px;
    margin: 0 auto;
    text-align: left;
  }
</style>
<script>
function TaskController(numConcurrent, onDone) {
  this.numConcurrent = numConcurrent;
  this.onDone = onDone || function() {};
  this.pending = 0;
  this.queued = [];
  this.checkTimer = -1;
}

TaskController.prototype.deferCheck = function() {
  if (this.checkTimer != -1) return;
  this.checkTimer = setTimeout((function() {
    this.checkTimer = -1;
    this.check();
  }).bind(this), 0);
};

TaskController.prototype.check = function() {
  if (this.pending < 1 && this.queued.length == 0) return this.onDone();
  while (this.pending < this.numConcurrent && this.queued.length > 0) {
    try {
      this.pending += 1;
      setTimeout((function(task) {
        task((function() {
          this.pending -= 1;
          this.deferCheck();
        }).bind(this));
      }).bind(this, this.queued.shift()), 0);
    }
    catch (e) {
      this.pending -= 1;
      this.deferCheck();
    }
  }
};

TaskController.prototype.queue = function(task) {
  this.queued.push(task);
  this.deferCheck();
};

function probeIp(ip, timeout, cb) {
  var start = Date.now();
  var done = false;
  var img = document.createElement('img');
  var clean = function() {
    if (!img) return;
    document.body.removeChild(img);
    img = null;
  };
  var onResult = function(success) {
    if (done) return;
    done = true;
    clean();
    cb(ip, Date.now() - start < timeout);
  };
  document.body.appendChild(img);
  img.style.display = 'none';
  img.onload = function() { onResult(true); };
  img.onerror = function() { onResult(false); };
  img.src = 'https://' + ip + ':3389/I_DO_NOT_EXIST?' + Math.random();
  setTimeout(function() { if (img) img.src = ''; }, timeout + 500);
}

function probeNet(net, onHostFound, onDone) {
  net = net.replace(/(\d+\.\d+\.\d+)\.\d+/, '$1.');
  var timeout = 5000;
  var done = false;
  var found = [];
  var q = new TaskController(5, onDone);
  for (var i = 1; i < 256; ++i) {
    q.queue((function(i, cb) {
      probeIp(net + i, timeout, function(ip, success) {
        if (success) onHostFound(ip);
        cb();
      });
    }).bind(this, i));
  }
}

function enumLocalIPs(cb) {
  var RTCPeerConnection = window.webkitRTCPeerConnection || window.mozRTCPeerConnection;
  if (!RTCPeerConnection) return false;
  var addrs = Object.create(null);
  addrs['0.0.0.0'] = false;
  function addAddress(newAddr) {
    if (newAddr in addrs) return;
    addrs[newAddr] = true;
    cb(newAddr);
  }
  function grepSDP(sdp) {
    var hosts = [];
    sdp.split('\r\n').forEach(function (line) {
      if (~line.indexOf('a=candidate')) {
        var parts = line.split(' '),
            addr = parts[4],
            type = parts[7];
        if (type === 'host') addAddress(addr);
      } else if (~line.indexOf('c=')) {
        var parts = line.split(' '),
        addr = parts[2];
        addAddress(addr);
      }
    });
  }
  var rtc = new RTCPeerConnection({iceServers:[]});
  if (window.mozRTCPeerConnection) rtc.createDataChannel('', {reliable:false});
  rtc.onicecandidate = function (evt) {
    if (evt.candidate) grepSDP(evt.candidate.candidate);
  };
  setTimeout(function() {
    rtc.createOffer(function (offerDesc) {
      grepSDP(offerDesc.sdp);
      rtc.setLocalDescription(offerDesc);
    }, function (e) {});
  }, 500);
  return true;
}

function go() {
  var q = new TaskController(1);
  enumLocalIPs(function(localIp) {
    document.getElementById('localips').innerHTML += localIp + '<br>';
    q.queue(function(cb) {
      probeNet(localIp,
               function(ip) {
                 document.getElementById('results').innerHTML += ip + '<br>';
               },
               cb);
    });
  }) || (document.getElementById('localips').innerHTML = 'WebRTC seems not to be supported');
}
</script>
</head>
<body onload="go()">
  <div id="container">
    <p>The script on this page will attempt to find your local ip addresses, using HTML5 WebRTC, and then use that info to probe for other live hosts on your lan(s).</p>
    <p>As provided it should work with Chrome and Firefox on Windows and OS X. Chromium on Linux does not work, Firefox reportedly does.</p>
    <p>See this post [<a href="https://2x.io/read/security-by-obscurity">https://2x.io/read/security-by-obscurity</a>] for a discussion on potential security and privacy consequences. Clues: Fingerprinting, Router / Printer exploitation.</p>
    <p>Note that reloading the page tends to cause a lot of false positives.</p>
    <hr>
    <p>Your local ips appear to be:</p>
    <div id="localips"></div>
    <br/>
    <p>Other boxes on your LAN possibly include (this will take some time ..):</p>
    <div id="results"></div>
  </container>
</body>
</html>
	<html>
	<head>
	<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Anonymous+Pro:400,700\|Droid+Sans+Mono\|Open+Sans:400,700\|Linden+Hill\|Quattrocento:400,700\|News+Cycle:400,700\|Antic+Slab\|Cabin+Condensed:400,700">
	<style>
	body {
	font-family: 'Open Sans', Helvetica, Arial, FreeSans;
	font-size: 12pt;
	color: #666;
	margin-top: 40px;
	text-align: center;
	}
	#container {
	width: auto;
	display: inline-block;
	max-width: 700px;
	margin: 0 auto;
	text-align: left;
	}
	</style>
	<script>
	function TaskController(numConcurrent, onDone) {
	this.numConcurrent = numConcurrent;
	this.onDone = onDone \|\| function() {};
	this.pending = 0;
	this.queued = [];
	this.checkTimer = -1;
	}

	TaskController.prototype.deferCheck = function() {
	if (this.checkTimer != -1) return;
	this.checkTimer = setTimeout((function() {
	this.checkTimer = -1;
	this.check();
	}).bind(this), 0);
	};

	TaskController.prototype.check = function() {
	if (this.pending < 1 && this.queued.length == 0) return this.onDone();
	while (this.pending < this.numConcurrent && this.queued.length > 0) {
	try {
	this.pending += 1;
	setTimeout((function(task) {
	task((function() {
	this.pending -= 1;
	this.deferCheck();
	}).bind(this));
	}).bind(this, this.queued.shift()), 0);
	}
	catch (e) {
	this.pending -= 1;
	this.deferCheck();
	}
	}
	};

	TaskController.prototype.queue = function(task) {
	this.queued.push(task);
	this.deferCheck();
	};

	function probeIp(ip, timeout, cb) {
	var start = Date.now();
	var done = false;
	var img = document.createElement('img');
	var clean = function() {
	if (!img) return;
	document.body.removeChild(img);
	img = null;
	};
	var onResult = function(success) {
	if (done) return;
	done = true;
	clean();
	cb(ip, Date.now() - start < timeout);
	};
	document.body.appendChild(img);
	img.style.display = 'none';
	img.onload = function() { onResult(true); };
	img.onerror = function() { onResult(false); };
	img.src = 'https://' + ip + ':3389/I_DO_NOT_EXIST?' + Math.random();
	setTimeout(function() { if (img) img.src = ''; }, timeout + 500);
	}

	function probeNet(net, onHostFound, onDone) {
	net = net.replace(/(\d+\.\d+\.\d+)\.\d+/, '$1.');
	var timeout = 5000;
	var done = false;
	var found = [];
	var q = new TaskController(5, onDone);
	for (var i = 1; i < 256; ++i) {
	q.queue((function(i, cb) {
	probeIp(net + i, timeout, function(ip, success) {
	if (success) onHostFound(ip);
	cb();
	});
	}).bind(this, i));
	}
	}

	function enumLocalIPs(cb) {
	var RTCPeerConnection = window.webkitRTCPeerConnection \|\| window.mozRTCPeerConnection;
	if (!RTCPeerConnection) return false;
	var addrs = Object.create(null);
	addrs['0.0.0.0'] = false;
	function addAddress(newAddr) {
	if (newAddr in addrs) return;
	addrs[newAddr] = true;
	cb(newAddr);
	}
	function grepSDP(sdp) {
	var hosts = [];
	sdp.split('\r\n').forEach(function (line) {
	if (~line.indexOf('a=candidate')) {
	var parts = line.split(' '),
	addr = parts[4],
	type = parts[7];
	if (type === 'host') addAddress(addr);
	} else if (~line.indexOf('c=')) {
	var parts = line.split(' '),
	addr = parts[2];
	addAddress(addr);
	}
	});
	}
	var rtc = new RTCPeerConnection({iceServers:[]});
	if (window.mozRTCPeerConnection) rtc.createDataChannel('', {reliable:false});
	rtc.onicecandidate = function (evt) {
	if (evt.candidate) grepSDP(evt.candidate.candidate);
	};
	setTimeout(function() {
	rtc.createOffer(function (offerDesc) {
	grepSDP(offerDesc.sdp);
	rtc.setLocalDescription(offerDesc);
	}, function (e) {});
	}, 500);
	return true;
	}

	function go() {
	var q = new TaskController(1);
	enumLocalIPs(function(localIp) {
	document.getElementById('localips').innerHTML += localIp + '<br>';
	q.queue(function(cb) {
	probeNet(localIp,
	function(ip) {
	document.getElementById('results').innerHTML += ip + '<br>';
	},
	cb);
	});
	}) \|\| (document.getElementById('localips').innerHTML = 'WebRTC seems not to be supported');
	}
	</script>
	</head>
	<body onload="go()">
	<div id="container">
	<p>The script on this page will attempt to find your local ip addresses, using HTML5 WebRTC, and then use that info to probe for other live hosts on your lan(s).</p>
	<p>As provided it should work with Chrome and Firefox on Windows and OS X. Chromium on Linux does not work, Firefox reportedly does.</p>
	<p>See this post [<a href="https://2x.io/read/security-by-obscurity">https://2x.io/read/security-by-obscurity</a>] for a discussion on potential security and privacy consequences. Clues: Fingerprinting, Router / Printer exploitation.</p>
	<p>Note that reloading the page tends to cause a lot of false positives.</p>
	<hr>
	<p>Your local ips appear to be:</p>
	<div id="localips"></div>
	<br/>
	<p>Other boxes on your LAN possibly include (this will take some time ..):</p>
	<div id="results"></div>
	</container>
	</body>
	</html>