From 11efebd29ee264402117f0a98b460b7aff23d369 Mon Sep 17 00:00:00 2001
From: Adam Frisby
Date: Wed, 18 Jul 2007 21:55:24 +0000
Subject: * Added "GetHostFromDNS" to Util to replace the various DNS
 resolution methods we use. Favours IPv4 addresses before IPv6 addresses to
 work around the Vista preference issue.

---
 OpenSim/Framework/General/Util.cs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

(limited to 'OpenSim/Framework/General/Util.cs')

diff --git a/OpenSim/Framework/General/Util.cs b/OpenSim/Framework/General/Util.cs
index 3333ced..97fe7da 100644
--- a/OpenSim/Framework/General/Util.cs
+++ b/OpenSim/Framework/General/Util.cs
@@ -27,6 +27,7 @@
 */
 using System;
 using System.Security.Cryptography;
+using System.Net;
 using System.Text;
 using libsecondlife;
 
@@ -176,6 +177,30 @@ namespace OpenSim.Framework.Utilities
 
             return output.ToString();
         }
+
+        /// <summary>
+        /// Returns a IP address from a specified DNS, favouring IPv4 addresses.
+        /// </summary>
+        /// <param name="dnsAddress">DNS Hostname</param>
+        /// <returns>An IP address, or null</returns>
+        public static IPAddress GetHostFromDNS(string dnsAddress)
+        {
+            IPAddress[] hosts = Dns.GetHostEntry(dnsAddress).AddressList;
+
+            foreach (IPAddress host in hosts)
+            {
+                if (host.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
+                {
+                    return host;
+                }
+            }
+
+            if (hosts.Length > 0)
+                return hosts[0];
+
+            return null;
+        }
+
         public Util()
         {
 
-- 
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