* Added a Basic DOS protection container/base object for the most common HTTP Server handlers. XMLRPC Handler, GenericHttpHandler and <Various>StreamHandler

* Applied the XmlRpcBasicDOSProtector.cs to the login service as both an example, and good practice.
* Applied the BaseStreamHandlerBasicDOSProtector.cs to the friends service as an example of the DOS Protector on StreamHandlers
* Added CircularBuffer, used for CPU and Memory friendly rate monitoring.
* DosProtector has 2 states, 1. Just Check for blocked users and check general velocity, 2. Track velocity per user,     It only jumps to 2 if it's getting a lot of requests, and state 1 is about as resource friendly as if it wasn't even there.

2 files changed, 30 insertions, 3 deletions

diff --git a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsRequestHandler.cs b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsRequestHandler.cs
index 2116605..ed4b205 100644
--- a/OpenSim/Region/CoreModules/Avatar/Friends/FriendsRequestHandler.cs
+++ b/OpenSim/Region/CoreModules/Avatar/Friends/FriendsRequestHandler.cs
@@ -42,14 +42,22 @@ using log4net;
 
 namespace OpenSim.Region.CoreModules.Avatar.Friends
 {
-    public class FriendsRequestHandler : BaseStreamHandler
+    public class FriendsRequestHandler : BaseStreamHandlerBasicDOSProtector
     {
         private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
 
         private FriendsModule m_FriendsModule;
 
         public FriendsRequestHandler(FriendsModule fmodule)
-                : base("POST", "/friends")
+                : base("POST", "/friends", new BasicDosProtectorOptions()
+                                          {
+                                              AllowXForwardedFor = true,
+                                              ForgetTimeSpan = TimeSpan.FromMinutes(2),
+                                              MaxRequestsInTimeframe = 5,
+                                              ReportingName = "FRIENDSDOSPROTECTOR",
+                                              RequestTimeSpan = TimeSpan.FromSeconds(5),
+                                              ThrottledAction = ThrottleAction.DoThrottledMethod
+                                          })
         {
             m_FriendsModule = fmodule;
         }
diff --git a/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs b/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
index a26a5f0..0f05e07 100644
--- a/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
+++ b/OpenSim/Region/CoreModules/World/WorldMap/WorldMapModule.cs
@@ -165,7 +165,16 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
             regionimage = regionimage.Replace("-", "");
             m_log.Info("[WORLD MAP]: JPEG Map location: " + m_scene.RegionInfo.ServerURI + "index.php?method=" + regionimage);
 
-            MainServer.Instance.AddHTTPHandler(regionimage, OnHTTPGetMapImage);
+            MainServer.Instance.AddHTTPHandler(regionimage,
+                new GenericHTTPDOSProtector(OnHTTPGetMapImage, OnHTTPThrottled, new BasicDosProtectorOptions()
+                    {
+                        AllowXForwardedFor = false,
+                        ForgetTimeSpan = TimeSpan.FromMinutes(2),
+                        MaxRequestsInTimeframe = 4,
+                        ReportingName = "MAPDOSPROTECTOR",
+                        RequestTimeSpan = TimeSpan.FromSeconds(10),
+                        ThrottledAction = ThrottleAction.DoThrottledMethod
+                    }).Process);
             MainServer.Instance.AddLLSDHandler(
                 "/MAP/MapItems/" + m_scene.RegionInfo.RegionHandle.ToString(), HandleRemoteMapItemRequest);
 
@@ -1081,6 +1090,16 @@ namespace OpenSim.Region.CoreModules.World.WorldMap
             block.Y = (ushort)(r.RegionLocY / Constants.RegionSize);
         }
 
+        public Hashtable OnHTTPThrottled(Hashtable keysvals)
+        {
+            Hashtable reply = new Hashtable();
+            int statuscode = 500;
+            reply["str_response_string"] = "I blocked you! HAHAHAHAHAHAHHAHAH";
+            reply["int_response_code"] = statuscode;
+            reply["content_type"] = "text/plain";
+            return reply;
+        }
+
         public Hashtable OnHTTPGetMapImage(Hashtable keysvals)
         {
             m_log.Debug("[WORLD MAP]: Sending map image jpeg");