correctly parse non-numeric ip addresses

correctly address mDNS addresses used to anonimize in desktop Chromium and Firefox

README.md

@@ -21,21 +21,20 @@ function getIPs(callback){
     var RTCPeerConnection = window.RTCPeerConnection
         || window.mozRTCPeerConnection
         || window.webkitRTCPeerConnection;
+    var useWebKit = !!window.webkitRTCPeerConnection;
 
-    //bypass naive webrtc blocking
-    if (!RTCPeerConnection) {
-        var iframe = document.createElement('iframe');
-        //invalidate content script
-        iframe.sandbox = 'allow-same-origin';
-        iframe.style.display = 'none';
-        document.body.appendChild(iframe);
+    //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;
-        window.RTCPeerConnection = win.RTCPeerConnection;
-        window.mozRTCPeerConnection = win.mozRTCPeerConnection;
-        window.webkitRTCPeerConnection = win.webkitRTCPeerConnection;
-        RTCPeerConnection = window.RTCPeerConnection
-            || window.mozRTCPeerConnection
-            || window.webkitRTCPeerConnection;
+        RTCPeerConnection = win.RTCPeerConnection
+            || win.mozRTCPeerConnection
+            || win.webkitRTCPeerConnection;
+        useWebKit = !!win.webkitRTCPeerConnection;
     }
 
     //minimal requirements for data connection
@@ -43,21 +42,14 @@ function getIPs(callback){
         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"}]};
+    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})/
+        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
@@ -87,14 +79,13 @@ function getIPs(callback){
     }, function(){});
 
     //wait for a while to let everything done
-    setTimeout(function() {
+    setTimeout(function(){
         //read candidate info from local description
         var lines = pc.localDescription.sdp.split('\n');
 
-        lines.forEach(function(line) {
-            if (line.startsWith('a=candidate:')) {
+        lines.forEach(function(line){
+            if(line.indexOf('a=candidate:') === 0)
                 handleCandidate(line);
-            }
         });
     }, 1000);
 }

index.html

@@ -19,6 +19,9 @@
         <ul></ul>
         <h4>Your public IP addresses:</h4>
         <ul></ul>
+        <h4>Your IPv6 addresses:</h4>
+        <ul></ul>
+        <iframe id="iframe" sandbox="allow-same-origin" style="display: none"></iframe>
         <script>
             //get the IP addresses associated with an account
             function getIPs(callback){
@@ -28,21 +31,20 @@
                 var RTCPeerConnection = window.RTCPeerConnection
                     || window.mozRTCPeerConnection
                     || window.webkitRTCPeerConnection;
+                var useWebKit = !!window.webkitRTCPeerConnection;
 
-                //bypass naive webrtc blocking
-                if (!RTCPeerConnection) {
-                    var iframe = document.createElement('iframe');
-                    //invalidate content script
-                    iframe.sandbox = 'allow-same-origin';
-                    iframe.style.display = 'none';
-                    document.body.appendChild(iframe);
+                //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;
-                    window.RTCPeerConnection = win.RTCPeerConnection;
-                    window.mozRTCPeerConnection = win.mozRTCPeerConnection;
-                    window.webkitRTCPeerConnection = win.webkitRTCPeerConnection;
-                    RTCPeerConnection = window.RTCPeerConnection
-                        || window.mozRTCPeerConnection
-                        || window.webkitRTCPeerConnection;
+                    RTCPeerConnection = win.RTCPeerConnection
+                        || win.mozRTCPeerConnection
+                        || win.webkitRTCPeerConnection;
+                    useWebKit = !!win.webkitRTCPeerConnection;
                 }
 
                 //minimal requirements for data connection
@@ -50,23 +52,18 @@
                     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"}]};
+                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})/
-                    var ip_addr = ip_regex.exec(candidate)[1];
-
+                    if (!candidate) return
+                    //https://datatracker.ietf.org/doc/html/rfc5245#section-15.1
+                    console.debug(candidate)
+                    const things = candidate.split(' ')
+                    const ip_addr = things[4]
+                    
                     //remove duplicates
                     if(ip_dups[ip_addr] === undefined)
                         callback(ip_addr);
@@ -76,7 +73,6 @@
 
                 //listen for candidate events
                 pc.onicecandidate = function(ice){
-
                     //skip non-candidate events
                     if(ice.candidate)
                         handleCandidate(ice.candidate.candidate);
@@ -93,13 +89,13 @@
 
                 }, function(){});
 
-                //wait for a while to let everything done
+                // 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.startsWith('a=candidate:'))
+                        if(line.indexOf('a=candidate:') === 0)
                             handleCandidate(line);
                     });
                 }, 1000);
@@ -114,6 +110,10 @@
                 if (ip.match(/^(192\.168\.|169\.254\.|10\.|172\.(1[6-9]|2\d|3[01]))/))
                     document.getElementsByTagName("ul")[0].appendChild(li);
 
+                //IPv6 addresses
+                else if (ip.match(/^[a-f0-9]{1,4}(:[a-f0-9]{1,4}){7}$/))
+                    document.getElementsByTagName("ul")[2].appendChild(li);
+
                 //assume the rest are public IPs
                 else
                     document.getElementsByTagName("ul")[1].appendChild(li);