3 files changed, 76 insertions, 1 deletions

diff --git a/OpenSim/Server/Base/ProtocolVersions.cs b/OpenSim/Server/Base/ProtocolVersions.cs
new file mode 100644
index 0000000..6df27b7
--- /dev/null
+++ b/OpenSim/Server/Base/ProtocolVersions.cs
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) Contributors, http://opensimulator.org/
+ * See CONTRIBUTORS.TXT for a full list of copyright holders.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *     * Neither the name of the OpenSimulator Project nor the
+ *       names of its contributors may be used to endorse or promote products
+ *       derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+namespace OpenSim.Server.Base
+{
+    public class ProtocolVersions
+    {
+        /// <value>
+        /// This is the external protocol versions.  It is separate from the OpenSimulator project version.  
+        /// 
+        /// These version numbers should be increased by 1 every time a code
+        /// change in the Service.Connectors and Server.Handlers, espectively, 
+        /// makes the previous OpenSimulator revision incompatible
+        /// with the new revision. 
+        /// 
+        /// Changes which are compatible with an older revision (e.g. older revisions experience degraded functionality
+        /// but not outright failure) do not need a version number increment.
+        /// 
+        /// Having this version number allows the grid service to reject connections from regions running a version
+        /// of the code that is too old. 
+        ///   
+        /// </value>
+        
+        // The range of acceptable servers for client-side connectors
+        public readonly static int ClientProtocolVersionMin = 0;
+        public readonly static int ClientProtocolVersionMax = 0;
+
+        // The range of acceptable clients in server-side handlers
+        public readonly static int ServerProtocolVersionMin = 0;
+        public readonly static int ServerProtocolVersionMax = 0;
+    }
+}
diff --git a/OpenSim/Server/Handlers/Grid/GridServerPostHandler.cs b/OpenSim/Server/Handlers/Grid/GridServerPostHandler.cs
index 711639f..3d72fec 100644
--- a/OpenSim/Server/Handlers/Grid/GridServerPostHandler.cs
+++ b/OpenSim/Server/Handlers/Grid/GridServerPostHandler.cs
@@ -118,6 +118,24 @@ namespace OpenSim.Server.Handlers.Grid
             else
                 m_log.WarnFormat("[GRID HANDLER]: no scopeID in request to register region");
 
+            int versionNumberMin = 0, versionNumberMax = 0;
+            if (request.ContainsKey("VERSIONMIN"))
+                Int32.TryParse(request["VERSIONMIN"], out versionNumberMin);
+            else
+                m_log.WarnFormat("[GRID HANDLER]: no minimum protocol version in request to register region");
+
+            if (request.ContainsKey("VERSIONMAX"))
+                Int32.TryParse(request["VERSIONMAX"], out versionNumberMax);
+            else
+                m_log.WarnFormat("[GRID HANDLER]: no maximum protocol version in request to register region");
+
+            // Check the protocol version
+            if ((versionNumberMin > ProtocolVersions.ServerProtocolVersionMax && versionNumberMax < ProtocolVersions.ServerProtocolVersionMax))
+            {
+                // Can't do, there is no overlap in the acceptable ranges
+                FailureResult();
+            }
+
             Dictionary<string, object> rinfoData = new Dictionary<string, object>();
             foreach (KeyValuePair<string, string> kvp in request)
                 rinfoData[kvp.Key] = kvp.Value;
diff --git a/OpenSim/Services/Connectors/Grid/GridServiceConnector.cs b/OpenSim/Services/Connectors/Grid/GridServiceConnector.cs
index 748892a..ba46b0d 100644
--- a/OpenSim/Services/Connectors/Grid/GridServiceConnector.cs
+++ b/OpenSim/Services/Connectors/Grid/GridServiceConnector.cs
@@ -94,7 +94,8 @@ namespace OpenSim.Services.Connectors
                 sendData[kvp.Key] = (string)kvp.Value;
 
             sendData["SCOPEID"] = scopeID.ToString();
-
+            sendData["VERSIONMIN"] = ProtocolVersions.ClientProtocolVersionMin.ToString();
+            sendData["VERSIONMAX"] = ProtocolVersions.ClientProtocolVersionMax.ToString();
             sendData["METHOD"] = "register";
 
             string reqString = ServerUtils.BuildQueryString(sendData);