1 files changed, 40 insertions, 0 deletions
diff --git a/MediaBrowser.Common.Implementations/Networking/BaseNetworkManager.cs b/MediaBrowser.Common.Implementations/Networking/BaseNetworkManager.cs
index e15c32518..96eb5e2f1 100644
--- a/MediaBrowser.Common.Implementations/Networking/BaseNetworkManager.cs
+++ b/MediaBrowser.Common.Implementations/Networking/BaseNetworkManager.cs
@@ -26,6 +26,46 @@ namespace MediaBrowser.Common.Implementations.Networking
             return GetLocalIpAddressesFallback();
         }
 
+        public bool IsInLocalNetwork(string endpoint)
+        {
+            if (string.IsNullOrWhiteSpace(endpoint))
+            {
+                throw new ArgumentNullException("endpoint");
+            }
+
+            IPAddress address;
+            if (!IPAddress.TryParse(endpoint, out address))
+            {
+                return true;
+            }
+
+            const int lengthMatch = 4;
+
+            if (endpoint.Length >= lengthMatch)
+            {
+                var prefix = endpoint.Substring(0, lengthMatch);
+
+                if (GetLocalIpAddresses()
+                    .Any(i => i.StartsWith(prefix, StringComparison.OrdinalIgnoreCase)))
+                {
+                    return true;
+                }
+            }
+
+            // Private address space:
+            // http://en.wikipedia.org/wiki/Private_network
+
+            return
+
+                // If url was requested with computer name, we may see this
+                endpoint.IndexOf("::", StringComparison.OrdinalIgnoreCase) != -1 ||
+
+                endpoint.StartsWith("10.", StringComparison.OrdinalIgnoreCase) ||
+                endpoint.StartsWith("192.", StringComparison.OrdinalIgnoreCase) ||
+                endpoint.StartsWith("172.", StringComparison.OrdinalIgnoreCase) ||
+                endpoint.StartsWith("169.", StringComparison.OrdinalIgnoreCase);
+        }
+
         private IEnumerable<IPAddress> GetIPsDefault()
         {
             foreach (var adapter in NetworkInterface.GetAllNetworkInterfaces())