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diff --git a/OpenSim/Services/HypergridService/GatekeeperService.cs b/OpenSim/Services/HypergridService/GatekeeperService.cs
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+/*
+ * 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 OpenSimulator 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 System;
+using System.Collections.Generic;
+using System.Net;
+using System.Reflection;
+
+using OpenSim.Framework;
+using OpenSim.Services.Interfaces;
+using GridRegion = OpenSim.Services.Interfaces.GridRegion;
+using OpenSim.Server.Base;
+using OpenSim.Services.Connectors.Hypergrid;
+
+using OpenMetaverse;
+
+using Nini.Config;
+using log4net;
+
+namespace OpenSim.Services.HypergridService
+{
+    public class GatekeeperService : IGatekeeperService
+    {
+        private static readonly ILog m_log =
+                LogManager.GetLogger(
+                MethodBase.GetCurrentMethod().DeclaringType);
+
+        IGridService m_GridService;
+        IPresenceService m_PresenceService;
+        IUserAccountService m_UserAccountService;
+        IUserAgentService m_UserAgentService;
+        ISimulationService m_SimulationService;
+
+        string m_AuthDll;
+
+        UUID m_ScopeID;
+        bool m_AllowTeleportsToAnyRegion;
+        string m_ExternalName;
+        GridRegion m_DefaultGatewayRegion;
+
+        public GatekeeperService(IConfigSource config, ISimulationService simService)
+        {
+            IConfig serverConfig = config.Configs["GatekeeperService"];
+            if (serverConfig == null)
+                throw new Exception(String.Format("No section GatekeeperService in config file"));
+
+            string accountService = serverConfig.GetString("UserAccountService", String.Empty);
+            string homeUsersService = serverConfig.GetString("HomeUsersSecurityService", string.Empty);
+            string gridService = serverConfig.GetString("GridService", String.Empty);
+            string presenceService = serverConfig.GetString("PresenceService", String.Empty);
+            string simulationService = serverConfig.GetString("SimulationService", String.Empty);
+
+            //m_AuthDll = serverConfig.GetString("AuthenticationService", String.Empty);
+
+            // These 3 are mandatory, the others aren't
+            if (gridService == string.Empty || presenceService == string.Empty || m_AuthDll == string.Empty)
+                throw new Exception("Incomplete specifications, Gatekeeper Service cannot function.");
+            
+            string scope = serverConfig.GetString("ScopeID", UUID.Zero.ToString());
+            UUID.TryParse(scope, out m_ScopeID);
+            //m_WelcomeMessage = serverConfig.GetString("WelcomeMessage", "Welcome to OpenSim!");
+            m_AllowTeleportsToAnyRegion = serverConfig.GetBoolean("AllowTeleportsToAnyRegion", true);
+            m_ExternalName = serverConfig.GetString("ExternalName", string.Empty);
+
+            Object[] args = new Object[] { config };
+            m_GridService = ServerUtils.LoadPlugin<IGridService>(gridService, args);
+            m_PresenceService = ServerUtils.LoadPlugin<IPresenceService>(presenceService, args);
+
+            if (accountService != string.Empty)
+                m_UserAccountService = ServerUtils.LoadPlugin<IUserAccountService>(accountService, args);
+            if (homeUsersService != string.Empty)
+                m_UserAgentService = ServerUtils.LoadPlugin<IUserAgentService>(homeUsersService, args);
+
+            if (simService != null)
+                m_SimulationService = simService;
+            else if (simulationService != string.Empty)
+                    m_SimulationService = ServerUtils.LoadPlugin<ISimulationService>(simulationService, args);
+
+            if (m_GridService == null || m_PresenceService == null || m_SimulationService == null)
+                throw new Exception("Unable to load a required plugin, Gatekeeper Service cannot function.");
+
+            m_log.Debug("[GATEKEEPER SERVICE]: Starting...");
+        }
+
+        public GatekeeperService(IConfigSource config)
+            : this(config, null)
+        {
+        }
+
+        public bool LinkRegion(string regionName, out UUID regionID, out ulong regionHandle, out string externalName, out string imageURL, out string reason)
+        {
+            regionID = UUID.Zero;
+            regionHandle = 0;
+            externalName = m_ExternalName;
+            imageURL = string.Empty;
+            reason = string.Empty;
+
+
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Request to link to {0}", (regionName == string.Empty)? "default region" : regionName);
+            if (!m_AllowTeleportsToAnyRegion || regionName == string.Empty)
+            {
+                List<GridRegion> defs = m_GridService.GetDefaultRegions(m_ScopeID);
+                if (defs != null && defs.Count > 0)
+                    m_DefaultGatewayRegion = defs[0];
+
+                try
+                {
+                    regionID = m_DefaultGatewayRegion.RegionID;
+                    regionHandle = m_DefaultGatewayRegion.RegionHandle;
+                }
+                catch
+                {
+                    reason = "Grid setup problem. Try specifying a particular region here.";
+                    m_log.DebugFormat("[GATEKEEPER SERVICE]: Unable to send information. Please specify a default region for this grid!");
+                    return false;
+                }
+
+                return true;
+            }
+
+            GridRegion region = m_GridService.GetRegionByName(m_ScopeID, regionName);
+            if (region == null)
+            {
+                reason = "Region not found";
+                return false;
+            }
+
+            regionID = region.RegionID;
+            regionHandle = region.RegionHandle;
+            string regionimage = "regionImage" + region.RegionID.ToString();
+            regionimage = regionimage.Replace("-", "");
+
+            imageURL = "http://" + region.ExternalHostName + ":" + region.HttpPort + "/index.php?method=" + regionimage;
+
+            return true;
+        }
+
+        public GridRegion GetHyperlinkRegion(UUID regionID)
+        {
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Request to get hyperlink region {0}", regionID);
+
+            if (!m_AllowTeleportsToAnyRegion)
+                // Don't even check the given regionID
+                return m_DefaultGatewayRegion;
+
+            GridRegion region = m_GridService.GetRegionByUUID(m_ScopeID, regionID);
+            return region;
+        }
+
+        #region Login Agent
+        public bool LoginAgent(AgentCircuitData aCircuit, GridRegion destination, out string reason)
+        {
+            reason = string.Empty;
+
+            string authURL = string.Empty;
+            if (aCircuit.ServiceURLs.ContainsKey("HomeURI"))
+                authURL = aCircuit.ServiceURLs["HomeURI"].ToString();
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Request to login foreign agent {0} {1} @ {2} ({3}) at destination {4}", 
+                aCircuit.firstname, aCircuit.lastname, authURL, aCircuit.AgentID, destination.RegionName);
+
+            //
+            // Authenticate the user
+            //
+            if (!Authenticate(aCircuit))
+            {
+                reason = "Unable to verify identity";
+                m_log.InfoFormat("[GATEKEEPER SERVICE]: Unable to verify identity of agent {0} {1}. Refusing service.", aCircuit.firstname, aCircuit.lastname);
+                return false;
+            }
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Identity verified for {0} {1} @ {2}", aCircuit.firstname, aCircuit.lastname, authURL);
+            
+            //
+            // Check for impersonations
+            //
+            UserAccount account = null;
+            if (m_UserAccountService != null)
+            {
+                // Check to see if we have a local user with that UUID
+                account = m_UserAccountService.GetUserAccount(m_ScopeID, aCircuit.AgentID);
+                if (account != null)
+                {
+                    // Make sure this is the user coming home, and not a foreign user with same UUID as a local user
+                    if (m_UserAgentService != null)
+                    {
+                        if (!m_UserAgentService.AgentIsComingHome(aCircuit.SessionID, m_ExternalName))
+                        {
+                            // Can't do, sorry
+                            reason = "Unauthorized";
+                            m_log.InfoFormat("[GATEKEEPER SERVICE]: Foreign agent {0} {1} has same ID as local user. Refusing service.",
+                                aCircuit.firstname, aCircuit.lastname);
+                            return false;
+
+                        }
+                    }
+                }
+            }
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: User is ok");
+
+            // May want to authorize
+
+            //
+            // Login the presence
+            //
+            if (!m_PresenceService.LoginAgent(aCircuit.AgentID.ToString(), aCircuit.SessionID, aCircuit.SecureSessionID))
+            {
+                reason = "Unable to login presence";
+                m_log.InfoFormat("[GATEKEEPER SERVICE]: Presence login failed for foreign agent {0} {1}. Refusing service.",
+                    aCircuit.firstname, aCircuit.lastname);
+                return false;
+            }
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Login presence ok");
+
+            //
+            // Get the region
+            //
+            destination = m_GridService.GetRegionByUUID(m_ScopeID, destination.RegionID);
+            if (destination == null)
+            {
+                reason = "Destination region not found";
+                return false;
+            }
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: destination ok: {0}", destination.RegionName);
+
+            //
+            // Adjust the visible name
+            //
+            if (account != null)
+            {
+                aCircuit.firstname = account.FirstName;
+                aCircuit.lastname = account.LastName;
+            }
+            if (account == null && !aCircuit.lastname.StartsWith("@"))
+            {
+                aCircuit.firstname = aCircuit.firstname + "." + aCircuit.lastname;
+                aCircuit.lastname = "@" + aCircuit.ServiceURLs["HomeURI"].ToString();
+            }
+
+            //
+            // Finally launch the agent at the destination
+            //
+            return m_SimulationService.CreateAgent(destination, aCircuit, (uint)Constants.TeleportFlags.ViaLogin, out reason);
+        }
+
+        protected bool Authenticate(AgentCircuitData aCircuit)
+        {
+            if (!CheckAddress(aCircuit.ServiceSessionID))
+                return false;
+
+            string userURL = string.Empty;
+            if (aCircuit.ServiceURLs.ContainsKey("HomeURI"))
+                userURL = aCircuit.ServiceURLs["HomeURI"].ToString();
+
+            if (userURL == string.Empty)
+            {
+                m_log.DebugFormat("[GATEKEEPER SERVICE]: Agent did not provide an authentication server URL");
+                return false;
+            }
+
+            Object[] args = new Object[] { userURL };
+            IUserAgentService userAgentService = new UserAgentServiceConnector(userURL); //ServerUtils.LoadPlugin<IUserAgentService>(m_AuthDll, args);
+            if (userAgentService != null)
+            {
+                try
+                {
+                    return userAgentService.VerifyAgent(aCircuit.SessionID, aCircuit.ServiceSessionID);
+                }
+                catch
+                {
+                    m_log.DebugFormat("[GATEKEEPER SERVICE]: Unable to contact authentication service at {0}", userURL);
+                    return false;
+                }
+            }
+
+            return false;
+        }
+
+        // Check that the service token was generated for *this* grid.
+        // If it wasn't then that's a fake agent.
+        protected bool CheckAddress(string serviceToken)
+        {
+            string[] parts = serviceToken.Split(new char[] { ';' });
+            if (parts.Length < 2)
+                return false;
+
+            string addressee = parts[0];
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Verifying {0} against {1}", addressee, m_ExternalName);
+            return (addressee == m_ExternalName);
+        }
+
+        #endregion
+
+
+        #region Misc
+
+
+        #endregion
+    }
+}