Mantis#1965. Thank you kindly, HomerHorwitz for a patch that:

Places touched:
- Added two events for in-packets to LLCLientView: RegionHandleRequest and
  ParcelInfoRequest
- Added sending of two out-packets to LLCLientView: RegionIDAndHandleReply and
  ParcelInfoReply.
- Scene handles the RegionHandleRequest, LandManagementModule the
  ParcelInfoRequest
- Added inter-region request for LandData by RegionHandle and local position.
  This was implemented as XML-RPC request. The returned LandData isn't
  complete, it only contains the data necessary for answering the
  ParcelInfoRequest
- Added new CAPS (0009) for RemoteParcelRequest and some methods for LandData
  handling to LandManagementModule
- Added methods for fake parcelID creation and parsing to Util
- Fixed missing implementation of interface methods.
- Added new file:
    OpenSim/Framework/Communications/Capabilities/LLSDRemoteParcelResponse.cs
  NOTE: This is part of the patch, too.
Due to the many places touched, I would consider this patch as experimental.

7 files changed, 92 insertions, 4 deletions

diff --git a/OpenSim/Framework/Communications/Capabilities/Caps.cs b/OpenSim/Framework/Communications/Capabilities/Caps.cs
index 7350d4d..1aa8eb0 100644
--- a/OpenSim/Framework/Communications/Capabilities/Caps.cs
+++ b/OpenSim/Framework/Communications/Capabilities/Caps.cs
@@ -86,11 +86,13 @@ namespace OpenSim.Framework.Communications.Capabilities
         private static readonly string m_notecardTaskUpdatePath = "0005/";
         // private static readonly string m_fetchInventoryPath = "0006/";
 
-        // The following two entries are in a module, however, there also here so that we don't re-assign
+        // The following entries are in a module, however, they are also here so that we don't re-assign
         // the path to another cap by mistake.
         // private static readonly string m_parcelVoiceInfoRequestPath = "0007/"; // This is in a module.
         // private static readonly string m_provisionVoiceAccountRequestPath = "0008/";// This is in a module.
 
+        // private static readonly string m_remoteParcelRequestPath = "0009/";// This is in the LandManagementModule.
+
         //private string eventQueue = "0100/";
         private BaseHttpServer m_httpListener;
         private LLUUID m_agentID;
diff --git a/OpenSim/Framework/Communications/Capabilities/LLSDRemoteParcelResponse.cs b/OpenSim/Framework/Communications/Capabilities/LLSDRemoteParcelResponse.cs
new file mode 100644
index 0000000..27adea0
--- /dev/null
+++ b/OpenSim/Framework/Communications/Capabilities/LLSDRemoteParcelResponse.cs
@@ -0,0 +1,42 @@
+/*

+* 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 OpenSim 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.

+*

+*/

+

+using libsecondlife;

+

+namespace OpenSim.Framework.Communications.Capabilities

+{

+    [LLSDType("MAP")]

+    public class LLSDRemoteParcelResponse

+    {

+        public LLUUID parcel_id;

+        

+        public LLSDRemoteParcelResponse()

+        {

+        }

+    }

+}

diff --git a/OpenSim/Framework/Communications/IGridServices.cs b/OpenSim/Framework/Communications/IGridServices.cs
index 3ecda68..509f408 100644
--- a/OpenSim/Framework/Communications/IGridServices.cs
+++ b/OpenSim/Framework/Communications/IGridServices.cs
@@ -57,5 +57,7 @@ namespace OpenSim.Framework.Communications
         RegionInfo RequestClosestRegion(string regionName);
         Dictionary<string, string> GetGridSettings();
         List<MapBlockData> RequestNeighbourMapBlocks(int minX, int minY, int maxX, int maxY);
+        // not complete yet, only contains the fields needed for ParcelInfoReqeust
+        LandData RequestLandData(ulong regionHandle, uint x, uint y);
     }
 }
diff --git a/OpenSim/Framework/IClientAPI.cs b/OpenSim/Framework/IClientAPI.cs
index 36842cc..536050c 100644
--- a/OpenSim/Framework/IClientAPI.cs
+++ b/OpenSim/Framework/IClientAPI.cs
@@ -293,6 +293,9 @@ namespace OpenSim.Framework
     public delegate void EstateBlueBoxMessageRequest(IClientAPI remoteClient, LLUUID invoice, LLUUID senderID, LLUUID sessionID, string senderName, string message);
     public delegate void EstateDebugRegionRequest(IClientAPI remoteClient, LLUUID invoice, LLUUID senderID, bool scripted, bool collisionEvents, bool physics);
     public delegate void EstateTeleportOneUserHomeRequest(IClientAPI remoteClient, LLUUID invoice, LLUUID senderID, LLUUID prey);
+    public delegate void RegionHandleRequest(IClientAPI remoteClient, LLUUID regionID);
+    public delegate void ParcelInfoRequest(IClientAPI remoteClient, LLUUID parcelID);
+    
     public delegate void ScriptReset(IClientAPI remoteClient, LLUUID objectID, LLUUID itemID);
     public delegate void GetScriptRunning(IClientAPI remoteClient, LLUUID objectID, LLUUID itemID);
     public delegate void SetScriptRunning(IClientAPI remoteClient, LLUUID objectID, LLUUID itemID, bool running);
@@ -498,6 +501,9 @@ namespace OpenSim.Framework
         event EstateDebugRegionRequest OnEstateDebugRegionRequest;
         event EstateTeleportOneUserHomeRequest OnEstateTeleportOneUserHomeRequest;
         event UUIDNameRequest OnUUIDGroupNameRequest;
+        
+        event RegionHandleRequest OnRegionHandleRequest;
+        event ParcelInfoRequest OnParcelInfoRequest;
 
         event RequestObjectPropertiesFamily OnObjectGroupRequest;
         event ScriptReset OnScriptReset;
@@ -721,5 +727,8 @@ namespace OpenSim.Framework
         
         void SendSetFollowCamProperties(LLUUID objectID, SortedDictionary<int, float> parameters);
         void SendClearFollowCamProperties(LLUUID objectID);
+        
+        void SendRegionHandle(LLUUID regoinID, ulong handle);
+        void SendParcelInfo(RegionInfo info, LandData land, LLUUID parcelID, uint x, uint y);
     }
 }
diff --git a/OpenSim/Framework/IRegionCommsListener.cs b/OpenSim/Framework/IRegionCommsListener.cs
index ce84a40..1758508 100644
--- a/OpenSim/Framework/IRegionCommsListener.cs
+++ b/OpenSim/Framework/IRegionCommsListener.cs
@@ -52,6 +52,8 @@ namespace OpenSim.Framework
 
     public delegate void LogOffUser(ulong regionHandle, LLUUID agentID, LLUUID regionSecret, string message);
 
+    public delegate LandData GetLandData(uint x, uint y);
+
     public interface IRegionCommsListener
     {
         event ExpectUserDelegate OnExpectUser;
@@ -66,5 +68,6 @@ namespace OpenSim.Framework
         event RegionUp OnRegionUp;
         event ChildAgentUpdate OnChildAgentUpdate;
         event LogOffUser OnLogOffUser;
+        event GetLandData OnGetLandData;
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Framework/RegionCommsListener.cs b/OpenSim/Framework/RegionCommsListener.cs
index 4045b44..0b50a81 100644
--- a/OpenSim/Framework/RegionCommsListener.cs
+++ b/OpenSim/Framework/RegionCommsListener.cs
@@ -46,7 +46,8 @@ namespace OpenSim.Framework
         private PrimCrossing handlerPrimCrossingIntoRegion = null; // OnPrimCrossingIntoRegion;
         private RegionUp handlerRegionUp = null; // OnRegionUp;
         private LogOffUser handlerLogOffUser = null;
-
+        private GetLandData handlerGetLandData = null;
+        
         #region IRegionCommsListener Members
 
         public event ExpectUserDelegate OnExpectUser;
@@ -61,6 +62,7 @@ namespace OpenSim.Framework
         public event RegionUp OnRegionUp;
         public event ChildAgentUpdate OnChildAgentUpdate;
         public event LogOffUser OnLogOffUser;
+        public event GetLandData OnGetLandData;
 
         #endregion
 
@@ -226,5 +228,14 @@ namespace OpenSim.Framework
 
             return false;
         }
+        
+        public LandData TriggerGetLandData(uint x, uint y)
+        {
+            handlerGetLandData = OnGetLandData;
+            if (handlerGetLandData != null)
+                return handlerGetLandData(x, y);
+            
+            return null;
+        }
     }
-}
\ No newline at end of file
+}
diff --git a/OpenSim/Framework/Util.cs b/OpenSim/Framework/Util.cs
index d72e03e..bc35fa6 100644
--- a/OpenSim/Framework/Util.cs
+++ b/OpenSim/Framework/Util.cs
@@ -716,5 +716,24 @@ namespace OpenSim.Framework
             XmlRpcRequest client = new XmlRpcRequest(methodName, args);
             return client.Send(url, 6000);
         }
+        
+        // used for RemoteParcelRequest (for "About Landmark")
+        public static LLUUID BuildFakeParcelID(ulong regionHandle, uint x, uint y) {
+            byte[] bytes = {
+                (byte)(regionHandle >> 56), (byte)(regionHandle >> 48), (byte)(regionHandle >> 40), (byte)(regionHandle >> 32),
+                (byte)(regionHandle >> 24), (byte)(regionHandle >> 16), (byte)(regionHandle >> 8), (byte)regionHandle,
+                (byte)(x >> 24), (byte)(x >> 16), (byte)(x >> 8), (byte)x,
+                (byte)(y >> 24), (byte)(y >> 16), (byte)(y >> 8), (byte)y };
+            return new LLUUID(bytes, 0);
+        }
+        
+        public static void ParseFakeParcelID(LLUUID parcelID, out ulong regionHandle, out uint x, out uint y) {
+            byte[] bytes = parcelID.GetBytes();
+            regionHandle = Helpers.BytesToUInt64(bytes);
+            x = Helpers.BytesToUInt(bytes, 8);
+            // grrr. I'd like to use that code in the next line, but libsl has an off-by-one bug here and returns 0.
+            //uint y = Helpers.BytesToUInt(bytes, 12);
+            y = (uint)((bytes[12] << 24) | (bytes[13] << 16) | (bytes[14] << 8) | bytes[15]);
+        }
     }
 }