1 files changed, 39 insertions, 1 deletions

diff --git a/OpenSim/Framework/NetworkUtil.cs b/OpenSim/Framework/NetworkUtil.cs
index 759c52f..81e6cad 100644
--- a/OpenSim/Framework/NetworkUtil.cs
+++ b/OpenSim/Framework/NetworkUtil.cs
@@ -14,11 +14,49 @@ namespace OpenSim.Framework
     /// This enables standard port forwarding techniques

     /// to work correctly with OpenSim.

     /// </summary>

-    static class NetworkUtil

+    public static class NetworkUtil

     {

         // IPv4Address, Subnet

         static readonly Dictionary<IPAddress,IPAddress> m_subnets = new Dictionary<IPAddress, IPAddress>();

 

+        public static IPAddress GetIPFor(IPAddress user, IPAddress simulator)

+        {

+            // Check if we're accessing localhost.

+            foreach (IPAddress host in Dns.GetHostAddresses(Dns.GetHostName()))

+            {

+                if (host.Equals(user) && host.AddressFamily == AddressFamily.InterNetwork)

+                    return host;

+            }

+

+            // Check for same LAN segment

+            foreach (KeyValuePair<IPAddress, IPAddress> subnet in m_subnets)

+            {

+                byte[] subnetBytes = subnet.Value.GetAddressBytes();

+                byte[] localBytes = subnet.Key.GetAddressBytes();

+                byte[] destBytes = user.GetAddressBytes();

+

+                if (subnetBytes.Length != destBytes.Length || subnetBytes.Length != localBytes.Length)

+                    return null;

+

+                bool valid = true;

+

+                for (int i = 0; i < subnetBytes.Length; i++)

+                {

+                    if ((localBytes[i] & subnetBytes[i]) != (destBytes[i] & subnetBytes[i]))

+                    {

+                        valid = false;

+                        break;

+                    }

+                }

+

+                if (valid)

+                    return subnet.Key;

+            }

+

+            // Otherwise, return outside address

+            return simulator;

+        }

+

         private static IPAddress GetExternalIPFor(IPAddress destination, string defaultHostname)

         {

             // Adds IPv6 Support (Not that any of the major protocols supports it...)