4 files changed, 32 insertions, 18 deletions

diff --git a/OpenSim/Framework/ChildAgentDataUpdate.cs b/OpenSim/Framework/ChildAgentDataUpdate.cs
index dfe60aa..9fc048b 100644
--- a/OpenSim/Framework/ChildAgentDataUpdate.cs
+++ b/OpenSim/Framework/ChildAgentDataUpdate.cs
@@ -171,9 +171,10 @@ namespace OpenSim.Framework
         /// Soon to be decommissioned
         /// </summary>
         /// <param name="cAgent"></param>
-        public void CopyFrom(ChildAgentDataUpdate cAgent)
+        public void CopyFrom(ChildAgentDataUpdate cAgent, UUID sid)
         {
             AgentID = new UUID(cAgent.AgentID);
+            SessionID = sid;
 
             // next: ???
             Size = new Vector3();
diff --git a/OpenSim/Framework/Tests/MundaneFrameworkTests.cs b/OpenSim/Framework/Tests/MundaneFrameworkTests.cs
index 1dc8053..3f0a031 100644
--- a/OpenSim/Framework/Tests/MundaneFrameworkTests.cs
+++ b/OpenSim/Framework/Tests/MundaneFrameworkTests.cs
@@ -100,7 +100,7 @@ namespace OpenSim.Framework.Tests
             cadu.AVHeight = Size1.Z;
 
             AgentPosition position2 = new AgentPosition();
-            position2.CopyFrom(cadu);
+            position2.CopyFrom(cadu, position1.SessionID);
 
             Assert.IsTrue(
                 position2.AgentID == position1.AgentID
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index ea7081c..b07faa2 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -4202,10 +4202,18 @@ namespace OpenSim.Region.Framework.Scenes
 
             if (childAgentUpdate != null)
             {
-                childAgentUpdate.ChildAgentDataUpdate(cAgentData);
-                return true;
+                if (cAgentData.SessionID == childAgentUpdate.ControllingClient.SessionId)
+                {
+                    childAgentUpdate.ChildAgentDataUpdate(cAgentData);
+                    return true;
+                }
+                else
+                {
+                    m_log.WarnFormat("[SCENE]: Attempt to update agent {0} with invalid session id {1}", childAgentUpdate.UUID, cAgentData.SessionID);
+                    Console.WriteLine(String.Format("[SCENE]: Attempt to update agent {0} ({1}) with invalid session id {2}", 
+                        childAgentUpdate.UUID, childAgentUpdate.ControllingClient.SessionId, cAgentData.SessionID));
+                }
             }
-
             return false;
         }
 
@@ -4221,20 +4229,24 @@ namespace OpenSim.Region.Framework.Scenes
             ScenePresence childAgentUpdate = GetScenePresence(cAgentData.AgentID);
             if (childAgentUpdate != null)
             {
-                // I can't imagine *yet* why we would get an update if the agent is a root agent..
-                // however to avoid a race condition crossing borders..
-                if (childAgentUpdate.IsChildAgent)
+                if (childAgentUpdate.ControllingClient.SessionId == cAgentData.SessionID)
                 {
-                    uint rRegionX = (uint)(cAgentData.RegionHandle >> 40);
-                    uint rRegionY = (((uint)(cAgentData.RegionHandle)) >> 8);
-                    uint tRegionX = RegionInfo.RegionLocX;
-                    uint tRegionY = RegionInfo.RegionLocY;
-                    //Send Data to ScenePresence
-                    childAgentUpdate.ChildAgentDataUpdate(cAgentData, tRegionX, tRegionY, rRegionX, rRegionY);
-                    // Not Implemented:
-                    //TODO: Do we need to pass the message on to one of our neighbors?
+                    // I can't imagine *yet* why we would get an update if the agent is a root agent..
+                    // however to avoid a race condition crossing borders..
+                    if (childAgentUpdate.IsChildAgent)
+                    {
+                        uint rRegionX = (uint)(cAgentData.RegionHandle >> 40);
+                        uint rRegionY = (((uint)(cAgentData.RegionHandle)) >> 8);
+                        uint tRegionX = RegionInfo.RegionLocX;
+                        uint tRegionY = RegionInfo.RegionLocY;
+                        //Send Data to ScenePresence
+                        childAgentUpdate.ChildAgentDataUpdate(cAgentData, tRegionX, tRegionY, rRegionX, rRegionY);
+                        // Not Implemented:
+                        //TODO: Do we need to pass the message on to one of our neighbors?
+                    }
                 }
-
+                else
+                    m_log.WarnFormat("[SCENE]: Attempt at updating position of agent {0} with invalid session id {1}", childAgentUpdate.UUID, cAgentData.SessionID);
                 return true;
             }
 
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index c5cca22..990ef6e 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -2927,7 +2927,7 @@ namespace OpenSim.Region.Framework.Scenes
                 cadu.Velocity = Velocity;
 
                 AgentPosition agentpos = new AgentPosition();
-                agentpos.CopyFrom(cadu);
+                agentpos.CopyFrom(cadu, ControllingClient.SessionId);
 
                 // Let's get this out of the update loop
                 Util.FireAndForget(delegate { m_scene.SendOutChildAgentUpdates(agentpos, this); });
@@ -3266,6 +3266,7 @@ namespace OpenSim.Region.Framework.Scenes
 
             cAgent.AgentID = UUID;
             cAgent.RegionID = Scene.RegionInfo.RegionID;
+            cAgent.SessionID = ControllingClient.SessionId;
 
             cAgent.Position = AbsolutePosition;
             cAgent.Velocity = m_velocity;