Merge branch 'master' into careminster

Conflicts:
	OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
	OpenSim/Region/Framework/Scenes/Scene.cs
	OpenSim/Region/Framework/Scenes/ScenePresence.cs
	bin/OpenSimDefaults.ini

9 files changed, 358 insertions, 85 deletions

diff --git a/OpenSim/Addons/Groups/RemoteConnectorCacheWrapper.cs b/OpenSim/Addons/Groups/RemoteConnectorCacheWrapper.cs
index 79d6fc5..3ac74fc 100644
--- a/OpenSim/Addons/Groups/RemoteConnectorCacheWrapper.cs
+++ b/OpenSim/Addons/Groups/RemoteConnectorCacheWrapper.cs
@@ -53,7 +53,7 @@ namespace OpenSim.Groups
         private ForeignImporter m_ForeignImporter;
 
         private Dictionary<string, bool> m_ActiveRequests = new Dictionary<string, bool>();
-        private const int GROUPS_CACHE_TIMEOUT = 5 * 60; // 5 minutes
+        private const int GROUPS_CACHE_TIMEOUT = 1 * 60; // 1 minutes
 
         // This all important cache cahces objects of different types:
         // group-<GroupID> or group-<Name>          => ExtendedGroupRecord
diff --git a/OpenSim/Framework/ChildAgentDataUpdate.cs b/OpenSim/Framework/ChildAgentDataUpdate.cs
index b399a58..4962629 100644
--- a/OpenSim/Framework/ChildAgentDataUpdate.cs
+++ b/OpenSim/Framework/ChildAgentDataUpdate.cs
@@ -292,7 +292,7 @@ namespace OpenSim.Framework
         public Vector3 AtAxis;
         public Vector3 LeftAxis;
         public Vector3 UpAxis;
-        public bool ChangedGrid;
+        public bool SenderWantsToWaitForRoot;
 
         public float Far;
         public float Aspect;
@@ -363,8 +363,9 @@ namespace OpenSim.Framework
             args["left_axis"] = OSD.FromString(LeftAxis.ToString());
             args["up_axis"] = OSD.FromString(UpAxis.ToString());
 
-            
-            args["changed_grid"] = OSD.FromBoolean(ChangedGrid);
+            //backwards compatibility
+            args["changed_grid"] = OSD.FromBoolean(SenderWantsToWaitForRoot);
+            args["wait_for_root"] = OSD.FromBoolean(SenderWantsToWaitForRoot);
             args["far"] = OSD.FromReal(Far);
             args["aspect"] = OSD.FromReal(Aspect);
 
@@ -537,8 +538,8 @@ namespace OpenSim.Framework
             if (args["up_axis"] != null)
                 Vector3.TryParse(args["up_axis"].AsString(), out AtAxis);
 
-            if (args["changed_grid"] != null)
-                ChangedGrid = args["changed_grid"].AsBoolean();
+            if (args.ContainsKey("wait_for_root") && args["wait_for_root"] != null)
+                SenderWantsToWaitForRoot = args["wait_for_root"].AsBoolean();
 
             if (args["far"] != null)
                 Far = (float)(args["far"].AsReal());
diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
index 7a4c6f4..544b54b 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
@@ -1302,6 +1302,19 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     queue.Enqueue(buffer);
                     return;
                 }
+                else if (packet.Type == PacketType.CompleteAgentMovement)
+                {
+                    // Send ack straight away to let the viewer know that we got it.
+                    SendAckImmediate(endPoint, packet.Header.Sequence);
+
+                    // We need to copy the endpoint so that it doesn't get changed when another thread reuses the
+                    // buffer.
+                    object[] array = new object[] { new IPEndPoint(endPoint.Address, endPoint.Port), packet };
+
+                    Util.FireAndForget(HandleCompleteMovementIntoRegion, array);
+
+                    return;
+                }
             }
 
             // Determine which agent this packet came from
@@ -1676,6 +1689,72 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             }
         }
 
+        private void HandleCompleteMovementIntoRegion(object o)
+        {
+            IPEndPoint endPoint = null;
+            IClientAPI client = null;
+
+            try
+            {
+                object[] array = (object[])o;
+                endPoint = (IPEndPoint)array[0];
+                CompleteAgentMovementPacket packet = (CompleteAgentMovementPacket)array[1];
+
+                // Determine which agent this packet came from
+                int count = 20;
+                bool ready = false;
+                while (!ready && count-- > 0)
+                {
+                    if (m_scene.TryGetClient(endPoint, out client) && client.IsActive && client.SceneAgent != null)
+                    {
+                        LLClientView llClientView = (LLClientView)client;
+                        LLUDPClient udpClient = llClientView.UDPClient;
+                        if (udpClient != null && udpClient.IsConnected)
+                            ready = true;
+                        else
+                        {
+                            m_log.Debug("[LLUDPSERVER]: Received a CompleteMovementIntoRegion in " + m_scene.RegionInfo.RegionName + " (not ready yet)");
+                            Thread.Sleep(200);
+                        }
+                    }
+                    else
+                    {
+                        m_log.Debug("[LLUDPSERVER]: Received a CompleteMovementIntoRegion in " + m_scene.RegionInfo.RegionName + " (not ready yet)");
+                        Thread.Sleep(200);
+                    }
+                }
+
+                if (client == null)
+                    return;
+
+                IncomingPacket incomingPacket1;
+
+                // Inbox insertion
+                if (UsePools)
+                {
+                    incomingPacket1 = m_incomingPacketPool.GetObject();
+                    incomingPacket1.Client = (LLClientView)client;
+                    incomingPacket1.Packet = packet;
+                }
+                else
+                {
+                    incomingPacket1 = new IncomingPacket((LLClientView)client, packet);
+                }
+
+                packetInbox.Enqueue(incomingPacket1);
+            }
+            catch (Exception e)
+            {
+                m_log.ErrorFormat(
+                    "[LLUDPSERVER]: CompleteMovementIntoRegion handling from endpoint {0}, client {1} {2} failed.  Exception {3}{4}",
+                    endPoint != null ? endPoint.ToString() : "n/a",
+                    client != null ? client.Name : "unknown",
+                    client != null ? client.AgentId.ToString() : "unknown",
+                    e.Message,
+                    e.StackTrace);
+            }
+        }
+
         /// <summary>
         /// Send an ack immediately to the given endpoint.
         /// </summary>
diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index a3c539d..29b4296 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -689,6 +689,20 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 agentCircuit.CapsPath = CapsUtil.GetRandomCapsObjectPath();
             }
 
+            if (version.Equals("SIMULATION/0.2"))
+                TransferAgent_V2(sp, agentCircuit, reg, finalDestination, endPoint, teleportFlags, oldRegionX, newRegionX, oldRegionY, newRegionY, version, out reason);
+            else
+                TransferAgent_V1(sp, agentCircuit, reg, finalDestination, endPoint, teleportFlags, oldRegionX, newRegionX, oldRegionY, newRegionY, version, out reason);
+
+        }
+
+        private void TransferAgent_V1(ScenePresence sp, AgentCircuitData agentCircuit, GridRegion reg, GridRegion finalDestination,
+            IPEndPoint endPoint, uint teleportFlags, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, string version, out string reason)
+        {
+            ulong destinationHandle = finalDestination.RegionHandle;
+            AgentCircuitData currentAgentCircuit = sp.Scene.AuthenticateHandler.GetAgentCircuitData(sp.ControllingClient.CircuitCode);
+
+            m_log.DebugFormat("[ENTITY TRANSFER MODULE]: Using TP V1");
             // Let's create an agent there if one doesn't exist yet. 
             // NOTE: logout will always be false for a non-HG teleport.
             bool logout = false;
@@ -710,7 +724,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 m_interRegionTeleportCancels.Value++;
 
                 m_log.DebugFormat(
-                    "[ENTITY TRANSFER MODULE]: Cancelled teleport of {0} to {1} from {2} after CreateAgent on client request", 
+                    "[ENTITY TRANSFER MODULE]: Cancelled teleport of {0} to {1} from {2} after CreateAgent on client request",
                     sp.Name, finalDestination.RegionName, sp.Scene.Name);
 
                 return;
@@ -732,11 +746,12 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // OK, it got this agent. Let's close some child agents
             sp.CloseChildAgents(newRegionX, newRegionY);
 
-            IClientIPEndpoint ipepClient;  
+            IClientIPEndpoint ipepClient;
+            string capsPath = String.Empty;
             if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
             {
                 m_log.DebugFormat(
-                    "[ENTITY TRANSFER MODULE]: Determined that region {0} at {1},{2} needs new child agent for incoming agent {3} from {4}", 
+                    "[ENTITY TRANSFER MODULE]: Determined that region {0} at {1},{2} needs new child agent for incoming agent {3} from {4}",
                     finalDestination.RegionName, newRegionX, newRegionY, sp.Name, Scene.Name);
 
                 //sp.ControllingClient.SendTeleportProgress(teleportFlags, "Creating agent...");
@@ -783,10 +798,9 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // Let's send a full update of the agent. This is a synchronous call.
             AgentData agent = new AgentData();
             sp.CopyTo(agent);
-            agent.Position = position;
+            agent.Position = agentCircuit.startpos;
             SetCallbackURL(agent, sp.Scene.RegionInfo);
 
-            //sp.ControllingClient.SendTeleportProgress(teleportFlags, "Updating agent...");
 
             // We will check for an abort before UpdateAgent since UpdateAgent will require an active viewer to 
             // establish th econnection to the destination which makes it return true.
@@ -821,7 +835,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 m_log.WarnFormat(
                     "[ENTITY TRANSFER MODULE]: UpdateAgent failed on teleport of {0} to {1} from {2}.  Keeping avatar in source region.",
                     sp.Name, finalDestination.RegionName, sp.Scene.RegionInfo.RegionName);
-                
+
                 Fail(sp, finalDestination, logout, currentAgentCircuit.SessionID.ToString(), "Connection between viewer and destination region could not be established.");
                 return;
             }
@@ -831,7 +845,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 m_interRegionTeleportCancels.Value++;
 
                 m_log.DebugFormat(
-                    "[ENTITY TRANSFER MODULE]: Cancelled teleport of {0} to {1} from {2} after UpdateAgent on client request", 
+                    "[ENTITY TRANSFER MODULE]: Cancelled teleport of {0} to {1} from {2} after UpdateAgent on client request",
                     sp.Name, finalDestination.RegionName, sp.Scene.Name);
 
                 CleanupFailedInterRegionTeleport(sp, currentAgentCircuit.SessionID.ToString(), finalDestination);
@@ -848,6 +862,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             // closes our existing agent which is still signalled as root.
             sp.IsChildAgent = true;
 
+            // OK, send TPFinish to the client, so that it starts the process of contacting the destination region
             if (m_eqModule != null)
             {
                 m_eqModule.TeleportFinishEvent(destinationHandle, 13, endPoint, 0, teleportFlags, capsPath, sp.UUID);
@@ -877,7 +892,7 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 m_log.WarnFormat(
                     "[ENTITY TRANSFER MODULE]: Teleport of {0} to {1} from {2} failed due to no callback from destination region.  Returning avatar to source region.",
                     sp.Name, finalDestination.RegionName, sp.Scene.RegionInfo.RegionName);
-                
+
                 Fail(sp, finalDestination, logout, currentAgentCircuit.SessionID.ToString(), "Destination region did not signal teleport completion.");
 
                 return;
@@ -906,13 +921,13 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
 
             if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
             {
-                // We need to delay here because Imprudence viewers, unlike v1 or v3, have a short (<200ms, <500ms) delay before
-                // they regard the new region as the current region after receiving the AgentMovementComplete
-                // response.  If close is sent before then, it will cause the viewer to quit instead.
-                //
-                // This sleep can be increased if necessary.  However, whilst it's active,
-                // an agent cannot teleport back to this region if it has teleported away.
-                Thread.Sleep(3000);
+                // RED ALERT!!!!
+                // PLEASE DO NOT DECREASE THIS WAIT TIME UNDER ANY CIRCUMSTANCES.
+                // THE VIEWERS SEEM TO NEED SOME TIME AFTER RECEIVING MoveAgentIntoRegion
+                // BEFORE THEY SETTLE IN THE NEW REGION.
+                // DECREASING THE WAIT TIME HERE WILL EITHER RESULT IN A VIEWER CRASH OR
+                // IN THE AVIE BEING PLACED IN INFINITY FOR A COUPLE OF SECONDS.
+                Thread.Sleep(5000);
 
                 sp.Scene.IncomingCloseAgent(sp.UUID, false);
             }
@@ -923,6 +938,134 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
             }
         }
 
+        private void TransferAgent_V2(ScenePresence sp, AgentCircuitData agentCircuit, GridRegion reg, GridRegion finalDestination,
+            IPEndPoint endPoint, uint teleportFlags, uint oldRegionX, uint newRegionX, uint oldRegionY, uint newRegionY, string version, out string reason)
+        {
+            ulong destinationHandle = finalDestination.RegionHandle;
+            AgentCircuitData currentAgentCircuit = sp.Scene.AuthenticateHandler.GetAgentCircuitData(sp.ControllingClient.CircuitCode);
+
+            // Let's create an agent there if one doesn't exist yet. 
+            // NOTE: logout will always be false for a non-HG teleport.
+            bool logout = false;
+            if (!CreateAgent(sp, reg, finalDestination, agentCircuit, teleportFlags, out reason, out logout))
+            {
+                m_interRegionTeleportFailures.Value++;
+
+                sp.ControllingClient.SendTeleportFailed(String.Format("Teleport refused: {0}", reason));
+
+                m_log.DebugFormat(
+                    "[ENTITY TRANSFER MODULE]: Teleport of {0} from {1} to {2} was refused because {3}",
+                    sp.Name, sp.Scene.RegionInfo.RegionName, finalDestination.RegionName, reason);
+
+                return;
+            }
+
+            // Past this point we have to attempt clean up if the teleport fails, so update transfer state.
+            m_entityTransferStateMachine.UpdateInTransit(sp.UUID, AgentTransferState.Transferring);
+
+            IClientIPEndpoint ipepClient;
+            string capsPath = String.Empty;
+            if (NeedsNewAgent(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY))
+            {
+                m_log.DebugFormat(
+                    "[ENTITY TRANSFER MODULE]: Determined that region {0} at {1},{2} needs new child agent for agent {3} from {4}",
+                    finalDestination.RegionName, newRegionX, newRegionY, sp.Name, Scene.Name);
+
+                //sp.ControllingClient.SendTeleportProgress(teleportFlags, "Creating agent...");
+                #region IP Translation for NAT
+                // Uses ipepClient above
+                if (sp.ClientView.TryGet(out ipepClient))
+                {
+                    endPoint.Address = NetworkUtil.GetIPFor(ipepClient.EndPoint, endPoint.Address);
+                }
+                #endregion
+                capsPath = finalDestination.ServerURI + CapsUtil.GetCapsSeedPath(agentCircuit.CapsPath);
+            }
+            else
+            {
+                agentCircuit.CapsPath = sp.Scene.CapsModule.GetChildSeed(sp.UUID, reg.RegionHandle);
+                capsPath = finalDestination.ServerURI + CapsUtil.GetCapsSeedPath(agentCircuit.CapsPath);
+            }
+
+            // We need to set this here to avoid an unlikely race condition when teleporting to a neighbour simulator,
+            // where that neighbour simulator could otherwise request a child agent create on the source which then 
+            // closes our existing agent which is still signalled as root.
+            //sp.IsChildAgent = true;
+
+            // New protocol: send TP Finish directly, without prior ES or EAC. That's what happens in the Linden grid
+            if (m_eqModule != null)
+                m_eqModule.TeleportFinishEvent(destinationHandle, 13, endPoint, 0, teleportFlags, capsPath, sp.UUID);
+            else
+                sp.ControllingClient.SendRegionTeleport(destinationHandle, 13, endPoint, 4,
+                                                            teleportFlags, capsPath);
+
+            m_log.DebugFormat(
+                "[ENTITY TRANSFER MODULE]: Sending new CAPS seed url {0} from {1} to {2}",
+                capsPath, sp.Scene.RegionInfo.RegionName, sp.Name);
+
+            // Let's send a full update of the agent. 
+            AgentData agent = new AgentData();
+            sp.CopyTo(agent);
+            agent.Position = agentCircuit.startpos;
+            agent.SenderWantsToWaitForRoot = true;
+            //SetCallbackURL(agent, sp.Scene.RegionInfo);
+
+            // Send the Update. If this returns true, we know the client has contacted the destination
+            // via CompleteMovementIntoRegion, so we can let go.
+            // If it returns false, something went wrong, and we need to abort.
+            if (!UpdateAgent(reg, finalDestination, agent, sp))
+            {
+                if (m_entityTransferStateMachine.GetAgentTransferState(sp.UUID) == AgentTransferState.Aborting)
+                {
+                    m_interRegionTeleportAborts.Value++;
+
+                    m_log.DebugFormat(
+                        "[ENTITY TRANSFER MODULE]: Aborted teleport of {0} to {1} from {2} after UpdateAgent due to previous client close.",
+                        sp.Name, finalDestination.RegionName, sp.Scene.Name);
+
+                    return;
+                }
+
+                m_log.WarnFormat(
+                    "[ENTITY TRANSFER MODULE]: UpdateAgent failed on teleport of {0} to {1} from {2}.  Keeping avatar in source region.",
+                    sp.Name, finalDestination.RegionName, sp.Scene.RegionInfo.RegionName);
+
+                Fail(sp, finalDestination, logout, currentAgentCircuit.SessionID.ToString(), "Connection between viewer and destination region could not be established.");
+                return;
+            }
+            
+            m_entityTransferStateMachine.UpdateInTransit(sp.UUID, AgentTransferState.CleaningUp);
+
+            // May need to logout or other cleanup
+            AgentHasMovedAway(sp, logout);
+
+            // Well, this is it. The agent is over there.
+            KillEntity(sp.Scene, sp.LocalId);
+
+            // Now let's make it officially a child agent
+            sp.MakeChildAgent();
+
+            // OK, it got this agent. Let's close some child agents
+            sp.CloseChildAgents(newRegionX, newRegionY);
+
+            // Finally, let's close this previously-known-as-root agent, when the jump is outside the view zone
+
+            if (NeedsClosing(sp.DrawDistance, oldRegionX, newRegionX, oldRegionY, newRegionY, reg))
+            {
+                // RED ALERT!!!!
+                // PLEASE DO NOT DECREASE THIS WAIT TIME UNDER ANY CIRCUMSTANCES.
+                // THE VIEWERS SEEM TO NEED SOME TIME AFTER RECEIVING MoveAgentIntoRegion
+                // BEFORE THEY SETTLE IN THE NEW REGION.
+                // DECREASING THE WAIT TIME HERE WILL EITHER RESULT IN A VIEWER CRASH OR
+                // IN THE AVIE BEING PLACED IN INFINITY FOR A COUPLE OF SECONDS.
+                Thread.Sleep(5000);
+                sp.Scene.IncomingCloseAgent(sp.UUID, false);
+            }
+            else
+                // now we have a child agent in this region. 
+                sp.Reset();
+        }
+
         /// <summary>
         /// Clean up an inter-region teleport that did not complete, either because of simulator failure or cancellation.
         /// </summary>
@@ -936,11 +1079,13 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
         {
             m_entityTransferStateMachine.UpdateInTransit(sp.UUID, AgentTransferState.CleaningUp);
 
-            sp.IsChildAgent = false;
-            ReInstantiateScripts(sp);
-
-            EnableChildAgents(sp);
+            if (sp.IsChildAgent) // We had set it to child before attempted TP (V1)
+            {
+                sp.IsChildAgent = false;
+                ReInstantiateScripts(sp);
 
+                EnableChildAgents(sp);
+            }
             // Finally, kill the agent we just created at the destination.
             // XXX: Possibly this should be done asynchronously.
             Scene.SimulationService.CloseAgent(finalDestination, sp.UUID, auth_token);
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Presence/PresenceDetector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Presence/PresenceDetector.cs
index 172bea1..516ad40 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Presence/PresenceDetector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Presence/PresenceDetector.cs
@@ -79,7 +79,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Presence
 
         public void OnConnectionClose(IClientAPI client)
         {
-            if (!client.SceneAgent.IsChildAgent)
+            if (client != null && client.SceneAgent != null && !client.SceneAgent.IsChildAgent)
             {
 //                m_log.DebugFormat("[PRESENCE DETECTOR]: Detected client logout {0} in {1}", client.AgentId, client.Scene.RegionInfo.RegionName);
                 m_PresenceService.LogoutAgent(client.SessionId);
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/LocalSimulationConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/LocalSimulationConnector.cs
index 8207fb9..39657a3 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/LocalSimulationConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Simulation/LocalSimulationConnector.cs
@@ -48,7 +48,7 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation
         /// <summary>
         /// Version of this service
         /// </summary>
-        private const string m_Version = "SIMULATION/0.1";
+        private const string m_Version = "SIMULATION/0.2";
 
         /// <summary>
         /// Map region ID to scene.
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index c132c5d..96e45ed 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -230,6 +230,8 @@ namespace OpenSim.Region.Framework.Scenes
         public bool m_seeIntoBannedRegion = false;
         public int MaxUndoCount = 5;
 
+        public bool SeeIntoRegion { get; set; }
+
         // Using this for RegionReady module to prevent LoginsDisabled from changing under our feet;
         public bool LoginLock = false;
 
@@ -861,9 +863,11 @@ namespace OpenSim.Region.Framework.Scenes
                 //Animation states
                 m_useFlySlow = startupConfig.GetBoolean("enableflyslow", false);
 
+
+                MaxUndoCount = startupConfig.GetInt("MaxPrimUndos", 20);
+
                 PhysicalPrims = startupConfig.GetBoolean("physical_prim", true);
                 CollidablePrims = startupConfig.GetBoolean("collidable_prim", true);
-
                 m_minNonphys = startupConfig.GetFloat("NonPhysicalPrimMin", m_minNonphys);
                 if (RegionInfo.NonphysPrimMin > 0)
                 {
@@ -3910,15 +3914,10 @@ namespace OpenSim.Region.Framework.Scenes
 
                     try
                     {
-                        // Always check estate if this is a login. Always
-                        // check if banned regions are to be blacked out.
-                        if (vialogin || (!m_seeIntoBannedRegion))
+                        if (!AuthorizeUser(agent, SeeIntoRegion, out reason))
                         {
-                            if (!AuthorizeUser(agent, out reason))
-                            {
-                                m_authenticateHandler.RemoveCircuit(agent.circuitcode);
-                                return false;
-                            }
+                            m_authenticateHandler.RemoveCircuit(agent.circuitcode);
+                            return false;
                         }
                     }
                     catch (Exception e)
@@ -4158,7 +4157,7 @@ namespace OpenSim.Region.Framework.Scenes
         /// <param name="reason">outputs the reason to this string</param>
         /// <returns>True if the region accepts this agent.  False if it does not.  False will 
         /// also return a reason.</returns>
-        protected virtual bool AuthorizeUser(AgentCircuitData agent, out string reason)
+        protected virtual bool AuthorizeUser(AgentCircuitData agent, bool bypassAccessControl, out string reason)
         {
             reason = String.Empty;
 
@@ -4193,51 +4192,58 @@ namespace OpenSim.Region.Framework.Scenes
                 m_log.ErrorFormat("[CONNECTION BEGIN]: Estate Settings is null!");
             }
 
-            List<UUID> agentGroups = new List<UUID>();
-
-            if (m_groupsModule != null)
+            // We only test the things below when we want to cut off
+            // child agents from being present in the scene for which their root
+            // agent isn't allowed. Otherwise, we allow child agents. The test for
+            // the root is done elsewhere (QueryAccess)
+            if (!bypassAccessControl)
             {
-                GroupMembershipData[] GroupMembership = m_groupsModule.GetMembershipData(agent.AgentID);
+                List<UUID> agentGroups = new List<UUID>();
 
-                if (GroupMembership != null)
+                if (m_groupsModule != null)
                 {
-                    for (int i = 0; i < GroupMembership.Length; i++)
-                        agentGroups.Add(GroupMembership[i].GroupID);
-                }
-                else
-                {
-                    m_log.ErrorFormat("[CONNECTION BEGIN]: GroupMembership is null!");
+                    GroupMembershipData[] GroupMembership = m_groupsModule.GetMembershipData(agent.AgentID);
+
+                    if (GroupMembership != null)
+                    {
+                        for (int i = 0; i < GroupMembership.Length; i++)
+                            agentGroups.Add(GroupMembership[i].GroupID);
+                    }
+                    else
+                    {
+                        m_log.ErrorFormat("[CONNECTION BEGIN]: GroupMembership is null!");
+                    }
                 }
-            }
 
-            bool groupAccess = false;
-            UUID[] estateGroups = RegionInfo.EstateSettings.EstateGroups;
+                bool groupAccess = false;
+                UUID[] estateGroups = RegionInfo.EstateSettings.EstateGroups;
 
-            if (estateGroups != null)
-            {
-                foreach (UUID group in estateGroups)
+                if (estateGroups != null)
                 {
-                    if (agentGroups.Contains(group))
+                    foreach (UUID group in estateGroups)
                     {
-                        groupAccess = true;
-                        break;
+                        if (agentGroups.Contains(group))
+                        {
+                            groupAccess = true;
+                            break;
+                        }
                     }
                 }
-            }
-            else
-            {
-                m_log.ErrorFormat("[CONNECTION BEGIN]: EstateGroups is null!");
-            }
+                else
+                {
+                    m_log.ErrorFormat("[CONNECTION BEGIN]: EstateGroups is null!");
+                }
 
-            if (!RegionInfo.EstateSettings.PublicAccess &&
-                !RegionInfo.EstateSettings.HasAccess(agent.AgentID) &&
-                !groupAccess)
-            {
-                m_log.WarnFormat("[CONNECTION BEGIN]: Denied access to: {0} ({1} {2}) at {3} because the user does not have access to the estate",
-                                 agent.AgentID, agent.firstname, agent.lastname, RegionInfo.RegionName);
-                reason = String.Format("Denied access to private region {0}: You are not on the access list for that region.",
-                                       RegionInfo.RegionName);
-                return false;
+                if (!RegionInfo.EstateSettings.PublicAccess &&
+                    !RegionInfo.EstateSettings.HasAccess(agent.AgentID) &&
+                    !groupAccess)
+                {
+                    m_log.WarnFormat("[CONNECTION BEGIN]: Denied access to: {0} ({1} {2}) at {3} because the user does not have access to the estate",
+                                     agent.AgentID, agent.firstname, agent.lastname, RegionInfo.RegionName);
+                    reason = String.Format("Denied access to private region {0}: You are not on the access list for that region.",
+                                           RegionInfo.RegionName);
+                    return false;
+                }
             }
 
             // TODO: estate/region settings are not properly hooked up
@@ -4402,6 +4408,20 @@ namespace OpenSim.Region.Framework.Scenes
                 }
 
                 childAgentUpdate.ChildAgentDataUpdate(cAgentData);
+
+                int ntimes = 20;
+                if (cAgentData.SenderWantsToWaitForRoot)
+                {
+                    while (childAgentUpdate.IsChildAgent && ntimes-- > 0)
+                        Thread.Sleep(1000);
+
+                    m_log.DebugFormat(
+                        "[SCENE]: Found presence {0} {1} {2} in {3} after {4} waits",
+                        childAgentUpdate.Name, childAgentUpdate.UUID, childAgentUpdate.IsChildAgent ? "child" : "root", RegionInfo.RegionName, 20 - ntimes);
+
+                    if (childAgentUpdate.IsChildAgent)
+                        return false;
+                }
                 return true;
             }
             return false;
@@ -4459,10 +4479,6 @@ namespace OpenSim.Region.Framework.Scenes
                 m_log.WarnFormat(
                     "[SCENE PRESENCE]: Did not find presence with id {0} in {1} before timeout",
                     agentID, RegionInfo.RegionName);
-//            else
-//                m_log.DebugFormat(
-//                    "[SCENE PRESENCE]: Found presence {0} {1} {2} in {3} after {4} waits",
-//                    sp.Name, sp.UUID, sp.IsChildAgent ? "child" : "root", RegionInfo.RegionName, 10 - ntimes);
 
             return sp;
         }
@@ -5873,7 +5889,7 @@ Environment.Exit(1);
 
             try
             {
-                if (!AuthorizeUser(aCircuit, out reason))
+                if (!AuthorizeUser(aCircuit, false, out reason))
                 {
                     // m_log.DebugFormat("[SCENE]: Denying access for {0}", agentID);
                     return false;
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index 1225c2e..c78fe62 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -29,7 +29,9 @@ using System;
 using System.Xml;
 using System.Collections.Generic;
 using System.Reflection;
+using System.Threading;
 using System.Timers;
+using Timer = System.Timers.Timer;
 using OpenMetaverse;
 using log4net;
 using Nini.Config;
@@ -1154,9 +1156,8 @@ namespace OpenSim.Region.Framework.Scenes
 
             MovementFlag = 0;
 
-            // DIVA NOTE: I moved TriggerOnMakeRootAgent out of here and into the end of
-            // CompleteMovement. We don't want modules doing heavy computation before CompleteMovement
-            // is over.
+            m_scene.EventManager.TriggerOnMakeRootAgent(this);
+
         }
 
         public int GetStateSource()
@@ -1502,6 +1503,26 @@ namespace OpenSim.Region.Framework.Scenes
             
         }
 
+        private bool WaitForUpdateAgent(IClientAPI client)
+        {
+            // Before UpdateAgent, m_originRegionID is UUID.Zero; after, it's non-Zero
+            int count = 20;
+            while (m_originRegionID.Equals(UUID.Zero) && count-- > 0)
+            {
+                m_log.DebugFormat("[SCENE PRESENCE]: Agent {0} waiting for update in {1}", client.Name, Scene.RegionInfo.RegionName);
+                Thread.Sleep(200);
+            }
+
+            if (m_originRegionID.Equals(UUID.Zero))
+            {
+                // Movement into region will fail
+                m_log.WarnFormat("[SCENE PRESENCE]: Update agent {0} never arrived", client.Name);
+                return false;
+            }
+
+            return true;
+        }
+
         /// <summary>
         /// Complete Avatar's movement into the region.
         /// </summary>
@@ -1519,6 +1540,13 @@ namespace OpenSim.Region.Framework.Scenes
                 "[SCENE PRESENCE]: Completing movement of {0} into region {1} in position {2}",
                 client.Name, Scene.RegionInfo.RegionName, AbsolutePosition);
 
+            // Make sure it's not a login agent. We don't want to wait for updates during login
+            if ((m_teleportFlags & TeleportFlags.ViaLogin) == 0)
+                // Let's wait until UpdateAgent (called by departing region) is done
+                if (!WaitForUpdateAgent(client))
+                    // The sending region never sent the UpdateAgent data, we have to refuse
+                    return;
+
             Vector3 look = Velocity;
 
             //            if ((look.X == 0) && (look.Y == 0) && (look.Z == 0))
@@ -1540,10 +1568,11 @@ namespace OpenSim.Region.Framework.Scenes
 
             bool flying = ((m_AgentControlFlags & AgentManager.ControlFlags.AGENT_CONTROL_FLY) != 0);
             MakeRootAgent(AbsolutePosition, flying);
+
+            // Tell the client that we're totally ready
             ControllingClient.MoveAgentIntoRegion(m_scene.RegionInfo, AbsolutePosition, look);
+
             // Remember in HandleUseCircuitCode, we delayed this to here
-            // This will also send the initial data to clients when TP to a neighboring region. 
-            // Not ideal, but until we know we're TP-ing from a neighboring region, there's not much we can do
             if (m_teleportFlags > 0)
                 SendInitialDataToMe();
 
@@ -1600,10 +1629,6 @@ namespace OpenSim.Region.Framework.Scenes
 //                "[SCENE PRESENCE]: Completing movement of {0} into region {1} took {2}ms", 
 //                client.Name, Scene.RegionInfo.RegionName, (DateTime.Now - startTime).Milliseconds);
 
-            // DIVA NOTE: moved this here from MakeRoot. We don't want modules making heavy
-            // computations before CompleteMovement is over
-            m_scene.EventManager.TriggerOnMakeRootAgent(this);
-
         }
 
         /// <summary>
diff --git a/bin/OpenSimDefaults.ini b/bin/OpenSimDefaults.ini
index 8055886..57bc79e 100644
--- a/bin/OpenSimDefaults.ini
+++ b/bin/OpenSimDefaults.ini
@@ -86,6 +86,13 @@
     ;; from the selected region_info_source.
     allow_regionless = false
 
+        ;; Allow child agents to see into the region even if their root counterpart isn't allowed in here
+        see_into_region = true
+
+    ; Maximum number of position, rotation and scale changes for each prim that the simulator will store for later undos
+    ; Increasing this number will increase memory usage.
+    MaxPrimUndos = 20
+
     ; Maximum size of non physical prims.  Affects resizing of existing prims.  This can be overriden in the region config file (as NonPhysicalPrimMax!).
     NonPhysicalPrimMax = 256