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.

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;

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()
+        {
+        }
+    }
+}

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);
     }
 }

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);
@@ -499,6 +502,9 @@ namespace OpenSim.Framework
         event EstateTeleportOneUserHomeRequest OnEstateTeleportOneUserHomeRequest;
         event UUIDNameRequest OnUUIDGroupNameRequest;
         
+        event RegionHandleRequest OnRegionHandleRequest;
+        event ParcelInfoRequest OnParcelInfoRequest;
+
         event RequestObjectPropertiesFamily OnObjectGroupRequest;
         event ScriptReset OnScriptReset;
         event GetScriptRunning OnGetScriptRunning;
@@ -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);
     }
 }

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;
     }
 }

OpenSim/Framework/RegionCommsListener.cs

@@ -46,6 +46,7 @@ namespace OpenSim.Framework
         private PrimCrossing handlerPrimCrossingIntoRegion = null; // OnPrimCrossingIntoRegion;
         private RegionUp handlerRegionUp = null; // OnRegionUp;
         private LogOffUser handlerLogOffUser = null;
+        private GetLandData handlerGetLandData = null;
         
         #region IRegionCommsListener Members
 
@@ -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;
+        }
     }
 }

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]);
+        }
     }
 }

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -229,6 +229,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         // private RequestAsset handlerRequestAsset = null; // OnRequestAsset;
         private UUIDNameRequest handlerTeleportHomeRequest = null;
 
+        private RegionHandleRequest handlerRegionHandleRequest = null; // OnRegionHandleRequest
+        private ParcelInfoRequest handlerParcelInfoRequest = null; // OnParcelInfoRequest
+        
         private ScriptAnswer handlerScriptAnswer = null;
         private RequestPayPrice handlerRequestPayPrice = null;
         private ObjectDeselect handlerObjectDetach = null;
@@ -916,6 +919,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         public event EstateBlueBoxMessageRequest OnEstateBlueBoxMessageRequest;
         public event EstateDebugRegionRequest OnEstateDebugRegionRequest;
         public event EstateTeleportOneUserHomeRequest OnEstateTeleportOneUserHomeRequest;
+        public event RegionHandleRequest OnRegionHandleRequest;
+        public event ParcelInfoRequest OnParcelInfoRequest;
         public event ScriptReset OnScriptReset;
         public event GetScriptRunning OnGetScriptRunning;
         public event SetScriptRunning OnSetScriptRunning;
@@ -5296,6 +5301,26 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
                     #region Parcel related packets
 
+                    case PacketType.RegionHandleRequest:
+                        RegionHandleRequestPacket rhrPack = (RegionHandleRequestPacket)Pack;
+                        
+                        handlerRegionHandleRequest = OnRegionHandleRequest;
+                        if (handlerRegionHandleRequest != null)
+                        {
+                            handlerRegionHandleRequest(this, rhrPack.RequestBlock.RegionID);
+                        }
+                        break;
+                    
+                    case PacketType.ParcelInfoRequest:
+                        ParcelInfoRequestPacket pirPack = (ParcelInfoRequestPacket)Pack;
+                        
+                        handlerParcelInfoRequest = OnParcelInfoRequest;
+                        if (handlerParcelInfoRequest != null)
+                        {
+                            handlerParcelInfoRequest(this, pirPack.Data.ParcelID);
+                        }
+                        break;
+                    
                     case PacketType.ParcelAccessListRequest:
                         ParcelAccessListRequestPacket requestPacket = (ParcelAccessListRequestPacket)Pack;
 
@@ -6294,5 +6319,45 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         }
 
         #endregion
+
+        public void SendRegionHandle(LLUUID regionID, ulong handle) {
+            RegionIDAndHandleReplyPacket reply = (RegionIDAndHandleReplyPacket)PacketPool.Instance.GetPacket(PacketType.RegionIDAndHandleReply);
+            reply.ReplyBlock.RegionID = regionID;
+            reply.ReplyBlock.RegionHandle = handle;
+            OutPacket(reply, ThrottleOutPacketType.Land);
+        }
+        
+        public void SendParcelInfo(RegionInfo info, LandData land, LLUUID parcelID, uint x, uint y)
+        {
+            ParcelInfoReplyPacket reply = (ParcelInfoReplyPacket)PacketPool.Instance.GetPacket(PacketType.ParcelInfoReply);
+            reply.AgentData.AgentID = m_agentId;
+            reply.Data.ParcelID = parcelID;
+            reply.Data.OwnerID = land.OwnerID;
+            reply.Data.Name = Helpers.StringToField(land.Name);
+            reply.Data.Desc = Helpers.StringToField(land.Description);
+            reply.Data.ActualArea = land.Area;
+            reply.Data.BillableArea = land.Area; // TODO: what is this?
+            
+            // Bit 0: Mature, bit 7: on sale, other bits: no idea
+            reply.Data.Flags = (byte)(
+                ((land.Flags & (uint)Parcel.ParcelFlags.MaturePublish) != 0 ? (1 << 0) : 0) +
+                ((land.Flags & (uint)Parcel.ParcelFlags.ForSale) != 0 ? (1 << 7) : 0));
+            
+            LLVector3 pos = land.UserLocation;
+            if (pos.Equals(LLVector3.Zero))
+            {
+                pos = (land.AABBMax + land.AABBMin) * 0.5f; 
+            }
+            reply.Data.GlobalX = info.RegionLocX * Constants.RegionSize + x;
+            reply.Data.GlobalY = info.RegionLocY * Constants.RegionSize + y;
+            reply.Data.GlobalZ = pos.Z;
+            reply.Data.SimName = Helpers.StringToField(info.RegionName);
+            reply.Data.SnapshotID = land.SnapshotID;
+            reply.Data.Dwell = 0; // TODO: not implemented yet
+            reply.Data.SalePrice = land.SalePrice;
+            reply.Data.AuctionID = (int)land.AuctionID;
+            
+            OutPacket(reply, ThrottleOutPacketType.Land);
+        }
     }
 }

OpenSim/Region/Communications/Local/LocalBackEndServices.cs

@@ -491,5 +491,20 @@ namespace OpenSim.Region.Communications.Local
 
             return false;
         }
+
+        public LandData RequestLandData (ulong regionHandle, uint x, uint y)
+        {
+            m_log.DebugFormat("[INTERREGION STANDALONE] requests land data in {0}, at {1}, {2}",
+                              regionHandle, x, y);
+            
+            if (m_regionListeners.ContainsKey(regionHandle))
+            {
+                LandData land = m_regionListeners[regionHandle].TriggerGetLandData(x, y);
+                return land;
+            }
+            
+            m_log.Debug("[INTERREGION STANDALONE] didn't find land data locally.");
+            return null;
+        }
     }
 }

OpenSim/Region/Communications/OGS1/OGS1GridServices.cs

@@ -28,6 +28,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.IO;
 using System.Net;
 using System.Net.Sockets;
 using System.Reflection;
@@ -92,6 +93,7 @@ namespace OpenSim.Region.Communications.OGS1
             httpServer.AddXmlRPCHandler("expect_user", ExpectUser);
             httpServer.AddXmlRPCHandler("logoff_user", LogOffUser);
             httpServer.AddXmlRPCHandler("check", PingCheckReply);
+            httpServer.AddXmlRPCHandler("land_data", LandData);
 
             StartRemoting();
         }
@@ -1624,5 +1626,104 @@ namespace OpenSim.Region.Communications.OGS1
                 }
             }
         }
+
+        public LandData RequestLandData (ulong regionHandle, uint x, uint y)
+        {
+            m_log.DebugFormat("[OGS1 GRID SERVICES] requests land data in {0}, at {1}, {2}",
+                              regionHandle, x, y);
+            LandData landData = m_localBackend.RequestLandData(regionHandle, x, y);
+            if (landData == null)
+            {
+                Hashtable hash = new Hashtable();
+                hash["region_handle"] = regionHandle.ToString();
+                hash["x"] = x.ToString();
+                hash["y"] = y.ToString();
+                
+                IList paramList = new ArrayList();
+                paramList.Add(hash);
+                
+                // this might be cached, as we probably requested it just a moment ago...
+                RegionInfo info = RequestNeighbourInfo(regionHandle);
+
+                try
+                {
+                    XmlRpcRequest request = new XmlRpcRequest("land_data", paramList);
+                    string uri = "http://" + info.ExternalEndPoint.Address + ":" + info.HttpPort + "/";
+                    XmlRpcResponse response = request.Send(uri, 10000);
+                    if (response.IsFault)
+                    {
+                        m_log.ErrorFormat("[OGS1 GRID SERVICES] remote call returned an error: {0}", response.FaultString);
+                    }
+                    else
+                    {
+                        hash = (Hashtable)response.Value;
+                        try {
+                            landData = new LandData();
+                            landData.AABBMax = LLVector3.Parse((string)hash["AABBMax"]);
+                            landData.AABBMin = LLVector3.Parse((string)hash["AABBMin"]);
+                            landData.Area = Convert.ToInt32(hash["Area"]);
+                            landData.AuctionID = Convert.ToUInt32(hash["AuctionID"]);
+                            landData.Description = (string)hash["Description"];
+                            landData.Flags = Convert.ToUInt32(hash["Flags"]);
+                            landData.GlobalID = new LLUUID((string)hash["GlobalID"]);
+                            landData.Name = (string)hash["Name"];
+                            landData.OwnerID = new LLUUID((string)hash["OwnerID"]);
+                            landData.SalePrice = Convert.ToInt32(hash["SalePrice"]);
+                            landData.SnapshotID = new LLUUID((string)hash["SnapshotID"]);
+                            landData.UserLocation = LLVector3.Parse((string)hash["UserLocation"]);
+                            m_log.DebugFormat("[OGS1 GRID SERVICES] Got land data for parcel {0}", landData.Name);
+                        }
+                        catch (Exception e)
+                        {
+                            m_log.Error("[OGS1 GRID SERVICES] Got exception while parsing land-data:", e);
+                        }
+                    }
+                }
+                catch (Exception e)
+                {
+                    m_log.ErrorFormat("[OGS1 GRID SERVICES] Couldn't contact region {0}: {1}", regionHandle, e);
+                }
+            }
+            return landData;
+        }
+
+        // Grid Request Processing
+        /// <summary>
+        /// Someone asked us about parcel-information
+        /// </summary>
+        /// <param name="request"></param>
+        /// <returns></returns>
+        public XmlRpcResponse LandData(XmlRpcRequest request)
+        {
+            Hashtable requestData = (Hashtable)request.Params[0];
+            ulong regionHandle = Convert.ToUInt64(requestData["region_handle"]);
+            uint x = Convert.ToUInt32(requestData["x"]);
+            uint y = Convert.ToUInt32(requestData["y"]);
+            m_log.DebugFormat("[OGS1 GRID SERVICES]: Got XML reqeuest for land data at {0}, {1} in region {2}", x, y, regionHandle);
+
+            LandData landData = m_localBackend.RequestLandData(regionHandle, x, y);
+            Hashtable hash = new Hashtable();
+            if (landData != null)
+            {
+                // for now, only push out the data we need for answering a ParcelInfoReqeust
+                // FIXME: these Replace calls are necessary as LLVector3.Parse can't parse vectors with spaces in them. Can be removed as soon as we switch to a newer version
+                hash["AABBMax"] = landData.AABBMax.ToString().Replace(" ", "");
+                hash["AABBMin"] = landData.AABBMin.ToString().Replace(" ", "");
+                hash["Area"] = landData.Area.ToString();
+                hash["AuctionID"] = landData.AuctionID.ToString();
+                hash["Description"] = landData.Description;
+                hash["Flags"] = landData.Flags.ToString();
+                hash["GlobalID"] = landData.GlobalID.ToString();
+                hash["Name"] = landData.Name;
+                hash["OwnerID"] = landData.OwnerID.ToString();
+                hash["SalePrice"] = landData.SalePrice.ToString();
+                hash["SnapshotID"] = landData.SnapshotID.ToString();
+                hash["UserLocation"] = landData.UserLocation.ToString().Replace(" ", "");
+            }
+
+            XmlRpcResponse response = new XmlRpcResponse();
+            response.Value = hash;
+            return response;
+        }
     }
 }

OpenSim/Region/Environment/Modules/World/Land/LandManagementModule.cs

@@ -26,19 +26,30 @@
  */
 
 using System;
+using System.Collections;
 using System.Collections.Generic;
+using System.Reflection;
 using libsecondlife;
+using log4net;
 using Nini.Config;
 using OpenSim.Region.Environment.Interfaces;
 using OpenSim.Region.Environment.Scenes;
 using OpenSim.Framework;
+using OpenSim.Framework.Servers;
+using OpenSim.Framework.Communications.Capabilities;
 using OpenSim.Region.Physics.Manager;
 using Axiom.Math;
+using Caps = OpenSim.Framework.Communications.Capabilities.Caps;
 
 namespace OpenSim.Region.Environment.Modules.World.Land
 {
     public class LandManagementModule : IRegionModule
     {
+        private static readonly ILog m_log =
+            LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+        
+        private static readonly string remoteParcelRequestPath = "0009/";
+        
         private LandChannel landChannel;
         private Scene m_scene;
 
@@ -75,6 +86,7 @@ namespace OpenSim.Region.Environment.Modules.World.Land
             m_scene.EventManager.OnSetAllowForcefulBan += this.SetAllowedForcefulBans;
             m_scene.EventManager.OnRequestParcelPrimCountUpdate += this.PerformParcelPrimCountUpdate;
             m_scene.EventManager.OnParcelPrimCountTainted += this.SetPrimsTainted;
+            m_scene.EventManager.OnRegisterCaps += this.OnRegisterCaps;
 
             lock (m_scene)
             {
@@ -95,7 +107,7 @@ namespace OpenSim.Region.Environment.Modules.World.Land
             client.OnParcelAccessListUpdateRequest += new ParcelAccessListUpdateRequest(handleParcelAccessUpdateRequest);
             client.OnParcelAbandonRequest += new ParcelAbandonRequest(handleParcelAbandonRequest);
             client.OnParcelReclaim += new ParcelReclaim(handleParcelReclaim);
-
+            client.OnParcelInfoRequest += new ParcelInfoRequest(handleParcelInfo);
             if (m_scene.Entities.ContainsKey(client.AgentId))
             {
                 SendLandUpdate((ScenePresence)m_scene.Entities[client.AgentId], true);
@@ -1084,6 +1096,112 @@ namespace OpenSim.Region.Environment.Modules.World.Land
         public void setSimulatorObjectMaxOverride(overrideSimulatorMaxPrimCountDelegate overrideDel)
         {
         }
+
+        #region CAPS handler
+        private void OnRegisterCaps(LLUUID agentID, Caps caps)
+        {
+            string capsBase = "/CAPS/" + caps.CapsObjectPath;
+            caps.RegisterHandler("RemoteParcelRequest",
+                                 new RestStreamHandler("POST", capsBase + remoteParcelRequestPath,
+                                                       delegate(string request, string path, string param,
+                                                                OSHttpRequest httpRequest, OSHttpResponse httpResponse)
+                                                           {
+                                                               return RemoteParcelRequest(request, path, param, agentID, caps);
+                                                           }));
+        }
+        
+        // we cheat here: As we don't have (and want) a grid-global parcel-store, we can't return the
+        // "real" parcelID, because we wouldn't be able to map that to the region the parcel belongs to.
+        // So, we create a "fake" parcelID by using the regionHandle (64 bit), and the local (integer) x
+        // and y coordinate (each 8 bit), encoded in a LLUUID (128 bit).
+        //
+        // Request format:
+        // <llsd>
+        //   <map>
+        //     <key>location</key>
+        //     <array>
+        //       <real>1.23</real>
+        //       <real>45..6</real>
+        //       <real>78.9</real>
+        //     </array>
+        //     <key>region_id</key>
+        //     <uuid>xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx</uuid>
+        //   </map>
+        // </llsd>
+        private string RemoteParcelRequest(string request, string path, string param, LLUUID agentID, Caps caps)
+        {
+            LLUUID parcelID = LLUUID.Zero;
+            try
+            {
+                Hashtable hash = new Hashtable();
+                hash = (Hashtable)LLSD.LLSDDeserialize(Helpers.StringToField(request));
+                if(hash.ContainsKey("region_id") && hash.ContainsKey("location"))
+                {
+                    LLUUID regionID = (LLUUID)hash["region_id"];
+                    ArrayList list = (ArrayList)hash["location"];
+                    uint x = (uint)(double)list[0];
+                    uint y = (uint)(double)list[1];
+                    if(hash.ContainsKey("region_handle"))
+                    {
+                        // if you do a "About Landmark" on a landmark a second time, the viewer sends the
+                        // region_handle it got earlier via RegionHandleRequest
+                        ulong regionHandle = Helpers.BytesToUInt64((byte[])hash["region_handle"]);
+                        parcelID = Util.BuildFakeParcelID(regionHandle, x, y);
+                    }
+                    else if(regionID == m_scene.RegionInfo.RegionID)
+                    {
+                        // a parcel request for a local parcel => no need to query the grid
+                        parcelID = Util.BuildFakeParcelID(m_scene.RegionInfo.RegionHandle, x, y);
+                    }
+                    else
+                    {
+                        // a parcel request for a parcel in another region. Ask the grid about the region
+                        RegionInfo info = m_scene.CommsManager.GridService.RequestNeighbourInfo(regionID);
+                        if(info != null) parcelID = Util.BuildFakeParcelID(info.RegionHandle, x, y);
+                    }
+                }
+            }
+            catch (LLSD.LLSDParseException e)
+            {
+                m_log.ErrorFormat("[LAND] Fetch error: {0}", e.Message);
+                m_log.ErrorFormat("[LAND] ... in request {0}", request);
+            }
+            catch(InvalidCastException)
+            {
+                m_log.ErrorFormat("[LAND] Wrong type in request {0}", request);
+            }
+            
+            LLSDRemoteParcelResponse response = new LLSDRemoteParcelResponse();
+            response.parcel_id = parcelID;
+            m_log.DebugFormat("[LAND] got parcelID {0}", parcelID);
+            
+            return LLSDHelpers.SerialiseLLSDReply(response);
+        }
+
+        #endregion
+
+        private void handleParcelInfo(IClientAPI remoteClient, LLUUID parcelID)
+        {
+            if(parcelID == LLUUID.Zero) return;
+
+            // assume we've got the parcelID we just computed in RemoteParcelRequest
+            ulong regionHandle;
+            uint x, y;
+            Util.ParseFakeParcelID(parcelID, out regionHandle, out x, out y);
+            m_log.DebugFormat("[LAND] got parcelinfo request for regionHandle {0}, x/y {1}/{2}", regionHandle, x, y);
+            
+            LandData landData;
+            if(regionHandle == m_scene.RegionInfo.RegionHandle) landData = this.GetLandObject(x, y).landData;
+            else landData = m_scene.CommsManager.GridService.RequestLandData(regionHandle, x, y);
+
+            if(landData != null)
+            {
+                // we need to transfer the fake parcelID, not the one in landData, so the viewer can match it to the landmark.
+                m_log.Debug("[LAND] got parcelinfo; sending");
+                remoteClient.SendParcelInfo(m_scene.RegionInfo, landData, parcelID, x, y);
+            }
+            else m_log.Debug("[LAND] got no parcelinfo; not sending");
+        }
     }
     
 }

OpenSim/Region/Environment/Modules/World/NPC/NPCAvatar.cs

@@ -302,6 +302,10 @@ namespace OpenSim.Region.Environment.Modules.World.NPC
         public event UpdateVector OnAutoPilotGo;
 
         public event TerrainUnacked OnUnackedTerrain;
+
+        public event RegionHandleRequest OnRegionHandleRequest;
+        public event ParcelInfoRequest OnParcelInfoRequest;
+        
 #pragma warning restore 67
 
         #endregion
@@ -832,5 +836,13 @@ namespace OpenSim.Region.Environment.Modules.World.NPC
         public void SendClearFollowCamProperties (LLUUID objectID)
         {
         }
+
+        public void SendRegionHandle (LLUUID regoinID, ulong handle)
+        {
+        }
+
+        public void SendParcelInfo (RegionInfo info, LandData land, LLUUID parcelID, uint x, uint y)
+        {
+        }
     }
 }

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -2171,6 +2171,8 @@ namespace OpenSim.Region.Environment.Scenes
             client.OnGetScriptRunning += GetScriptRunning;
             client.OnSetScriptRunning += SetScriptRunning;
             
+            client.OnRegionHandleRequest += RegionHandleRequest;
+
             client.OnUnackedTerrain += TerrainUnAcked;
 
             // EventManager.TriggerOnNewClient(client);
@@ -2502,6 +2504,7 @@ namespace OpenSim.Region.Environment.Scenes
             m_sceneGridService.OnRemoveKnownRegionFromAvatar += HandleRemoveKnownRegionsFromAvatar;
             m_sceneGridService.OnLogOffUser += HandleLogOffUserFromGrid;
             m_sceneGridService.KillObject += SendKillObject;
+            m_sceneGridService.OnGetLandData += GetLandData;
         }
 
         /// <summary>
@@ -2518,6 +2521,7 @@ namespace OpenSim.Region.Environment.Scenes
             m_sceneGridService.OnExpectUser -= NewUserConnection;
             m_sceneGridService.OnAvatarCrossingIntoRegion -= AgentCrossing;
             m_sceneGridService.OnCloseAgentConnection -= CloseConnection;
+            m_sceneGridService.OnGetLandData -= GetLandData;
 
             m_sceneGridService.Close();
         }
@@ -3436,6 +3440,12 @@ namespace OpenSim.Region.Environment.Scenes
             return LandChannel.GetLandObject(x, y).landData;
         }
 
+        public LandData GetLandData(uint x, uint y)
+        {
+            m_log.DebugFormat("[SCENE] returning land for {0},{1}", x, y);
+            return LandChannel.GetLandObject((int)x, (int)y).landData;
+        }
+
         public void SetLandMusicURL(float x, float y, string url)
         {
             ILandObject land = LandChannel.GetLandObject(x, y);
@@ -3834,6 +3844,14 @@ namespace OpenSim.Region.Environment.Scenes
 //            });
         }
         
+        public void RegionHandleRequest(IClientAPI client, LLUUID regionID)
+        {
+            RegionInfo info;
+            if(regionID == RegionInfo.RegionID) info = RegionInfo;
+            else info = CommsManager.GridService.RequestNeighbourInfo(regionID);
+            if(info != null) client.SendRegionHandle(regionID, info.RegionHandle);
+        }
+
 
         public void TerrainUnAcked(IClientAPI client, int patchX, int patchY)
         {

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -59,6 +59,7 @@ namespace OpenSim.Region.Environment.Scenes
         public event ChildAgentUpdate OnChildAgentUpdate;
         public event RemoveKnownRegionsFromAvatarList OnRemoveKnownRegionFromAvatar;
         public event LogOffUser OnLogOffUser;
+        public event GetLandData OnGetLandData;
         
         private AgentCrossing handlerAvatarCrossingIntoRegion = null; // OnAvatarCrossingIntoRegion;
         private ExpectUserDelegate handlerExpectUser = null; // OnExpectUser;
@@ -69,6 +70,7 @@ namespace OpenSim.Region.Environment.Scenes
         private ChildAgentUpdate handlerChildAgentUpdate = null; // OnChildAgentUpdate;
         private RemoveKnownRegionsFromAvatarList handlerRemoveKnownRegionFromAvatar = null; // OnRemoveKnownRegionFromAvatar;
         private LogOffUser handlerLogOffUser = null;
+        private GetLandData handlerGetLandData = null; // OnGetLandData 
 
         public KillObjectDelegate KillObject;
         public string _debugRegionName = String.Empty;
@@ -108,6 +110,7 @@ namespace OpenSim.Region.Environment.Scenes
                 regionCommsHost.OnRegionUp += newRegionUp;
                 regionCommsHost.OnChildAgentUpdate += ChildAgentUpdate;
                 regionCommsHost.OnLogOffUser += GridLogOffUser;
+                regionCommsHost.OnGetLandData += FetchLandData;
             }
             else
             {
@@ -131,6 +134,7 @@ namespace OpenSim.Region.Environment.Scenes
                 regionCommsHost.OnExpectPrim -= IncomingPrimCrossing;
                 regionCommsHost.OnAvatarCrossingIntoRegion -= AgentCrossing;
                 regionCommsHost.OnCloseAgentConnection -= CloseConnection;
+                regionCommsHost.OnGetLandData -= FetchLandData;
                 m_commsProvider.GridService.DeregisterRegion(m_regionInfo);
                 regionCommsHost = null;
             }
@@ -227,6 +231,16 @@ namespace OpenSim.Region.Environment.Scenes
             return false;
         }
 
+        protected LandData FetchLandData(uint x, uint y)
+        {
+            handlerGetLandData = OnGetLandData;
+            if (handlerGetLandData != null)
+            {
+                return handlerGetLandData(x, y);
+            }
+            return null;
+        }
+        
         #endregion
 
         #region Inform Client of Neighbours

OpenSim/Region/Examples/SimpleModule/MyNpcCharacter.cs

@@ -204,6 +204,9 @@ namespace OpenSim.Region.Examples.SimpleModule
 
        public event TerrainUnacked OnUnackedTerrain;
 
+       public event RegionHandleRequest OnRegionHandleRequest;
+       public event ParcelInfoRequest OnParcelInfoRequest;
+
 #pragma warning restore 67
 
         private LLUUID myID = LLUUID.Random();
@@ -832,5 +835,13 @@ namespace OpenSim.Region.Examples.SimpleModule
         public void SendClearFollowCamProperties (LLUUID objectID)
         {
         }
+
+        public void SendRegionHandle (LLUUID regoinID, ulong handle)
+        {
+        }
+
+        public void SendParcelInfo (RegionInfo info, LandData land, LLUUID parcelID, uint x, uint y)
+        {
+        }
     }
 }