make getIpAddresses return ip6 addresses too

lib/iputils.js

@@ -70,6 +70,24 @@ var getIpAddresses = (function() {
 
   var os = require('os');
 
+  var isIpv6WeCareAbout = (function() {
+    var ignoredTopSegments = {
+      "fe80": true,
+      "ff00": true,
+      "fc00": true,
+      "fec0": true,
+    };
+    return function(address) {
+      // honestly I don't really understand ipv6 and which address make no sense. It seems
+      // like the top few bits might stay but
+
+      // should probably check for 0 using ip6addr
+
+      var topSegment = address.substr(0, 4).toLowerCase();
+      return ignoredTopSegments[topSegment] === undefined;
+    }
+  }());
+
   return function() {
     var now = Date.now();
     if (!addresses || now - lastRead > cacheTime) {
@@ -78,9 +96,13 @@ var getIpAddresses = (function() {
       addresses = [];
       for (var k in interfaces) {
         for (var k2 in interfaces[k]) {
-          var address = interfaces[k][k2];
-          if (address.family === 'IPv4' && !address.internal) {
-            addresses.push(address.address);
+          var iface = interfaces[k][k2];
+          if (!iface.internal) {
+            if (iface.family === 'IPv4') {
+              addresses.push(iface.address);
+            } else if (iface.family === 'IPv6' && isIpv6WeCareAbout(iface.address)) {
+              addresses.push("[" + iface.address + "]");
+            }
           }
         }
       }