From 1d86cb16c482a874f50aaec1f72070935889af1d Mon Sep 17 00:00:00 2001
From: AaronNGray <aaronngray@gmail.com>
Date: Mon, 31 Jul 2017 02:31:03 +0100
Subject: [PATCH 1/2] Modified 'lib/server.js' to deal with IP addresses
 correctly.

---
 lib/server.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/lib/server.js b/lib/server.js
index fd59f52..e84173d 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -1,4 +1,5 @@
 var assert = require('assert');
+var net = require('net');
 var dgram = require('dgram');
 var EventEmitter = require('events').EventEmitter;
 var util = require('util');
@@ -50,7 +51,12 @@ Server.prototype.listen = function listen(port, address, callback) {
 
         var self = this;
 
-        this._socket = dgram.createSocket('udp6');
+        var ip_version = net.isIP(address);
+
+        if (!ip_version)
+            self.emit('error', new Error("Invalid IP address"));
+
+        this._socket = dgram.createSocket((ip_version == 4) ? 'udp4' : 'udp6');
         this._socket.once('listening', function () {
                 self.emit('listening');
                 if (typeof (callback) === 'function')
@@ -71,7 +77,7 @@ Server.prototype.listen = function listen(port, address, callback) {
                 };
 
                 var src = {
-                        family: 'udp6',
+                        family: ((ip_version == 4) ? 'udp4' : 'udp6'),
                         address: rinfo.address,
                         port: rinfo.port
                 };

From 225ea893ee4209c38da41b88dada6cb14213cdbb Mon Sep 17 00:00:00 2001
From: Song Zheng <song@zheng.club>
Date: Sat, 24 Mar 2018 16:09:02 -0700
Subject: [PATCH 2/2] fix comments

---
 lib/server.js | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/lib/server.js b/lib/server.js
index e84173d..cf9f0ed 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -7,7 +7,9 @@ var util = require('util');
 var Query = require('./query');
 var DnsError = require('./errors');
 
-
+function getFamily(ipVersion) {
+  return (ipVersion == 4) ? 'udp4' : 'udp6';
+}
 
 ///--- Globals
 
@@ -52,11 +54,12 @@ Server.prototype.listen = function listen(port, address, callback) {
         var self = this;
 
         var ip_version = net.isIP(address);
+        var ip_family = getFamily(ip_version);
 
         if (!ip_version)
             self.emit('error', new Error("Invalid IP address"));
 
-        this._socket = dgram.createSocket((ip_version == 4) ? 'udp4' : 'udp6');
+        this._socket = dgram.createSocket(ip_family);
         this._socket.once('listening', function () {
                 self.emit('listening');
                 if (typeof (callback) === 'function')
@@ -77,7 +80,7 @@ Server.prototype.listen = function listen(port, address, callback) {
                 };
 
                 var src = {
-                        family: ((ip_version == 4) ? 'udp4' : 'udp6'),
+                        family: ip_family,
                         address: rinfo.address,
                         port: rinfo.port
                 };