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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 System.Text.RegularExpressions;
+
+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);
+
+        private static bool m_Initialized = false;
+
+        private static IGridService m_GridService;
+        private static IPresenceService m_PresenceService;
+        private static IUserAccountService m_UserAccountService;
+        private static IUserAgentService m_UserAgentService;
+        private static ISimulationService m_SimulationService;
+
+        protected string m_AllowedClients = string.Empty;
+        protected string m_DeniedClients = string.Empty;
+
+        private static UUID m_ScopeID;
+        private static bool m_AllowTeleportsToAnyRegion;
+        private static string m_ExternalName;
+        private static GridRegion m_DefaultGatewayRegion;
+
+        public GatekeeperService(IConfigSource config, ISimulationService simService)
+        {
+            if (!m_Initialized)
+            {
+                m_Initialized = true;
+
+                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("UserAgentService", string.Empty);
+                string gridService = serverConfig.GetString("GridService", String.Empty);
+                string presenceService = serverConfig.GetString("PresenceService", String.Empty);
+                string simulationService = serverConfig.GetString("SimulationService", String.Empty);
+
+                // These 3 are mandatory, the others aren't
+                if (gridService == string.Empty || presenceService == 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);
+                if (m_ExternalName != string.Empty && !m_ExternalName.EndsWith("/"))
+                    m_ExternalName = m_ExternalName + "/";
+
+                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);
+
+                m_AllowedClients = serverConfig.GetString("AllowedClients", string.Empty);
+                m_DeniedClients = serverConfig.GetString("DeniedClients", string.Empty);
+
+                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 + ((regionName != string.Empty) ? " " + regionName : "");
+            imageURL = string.Empty;
+            reason = string.Empty;
+            GridRegion region = null;
+
+            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)
+                {
+                    region = defs[0];
+                    m_DefaultGatewayRegion = region;
+                }
+                else
+                {
+                    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;
+                }
+            }
+            else
+            {
+                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" + regionID.ToString();
+            regionimage = regionimage.Replace("-", "");
+            imageURL = region.ServerURI + "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.InfoFormat("[GATEKEEPER SERVICE]: Login request for {0} {1} @ {2} ({3}) at {4} using viewer {5}, channel {6}, IP {7}, Mac {8}, Id0 {9}",
+                aCircuit.firstname, aCircuit.lastname, authURL, aCircuit.AgentID, destination.RegionName,
+                aCircuit.Viewer, aCircuit.Channel, aCircuit.IPAddress, aCircuit.Mac, aCircuit.Id0);
+            
+            //
+            // Check client
+            //
+            if (m_AllowedClients != string.Empty)
+            {
+                Regex arx = new Regex(m_AllowedClients);
+                Match am = arx.Match(aCircuit.Viewer);
+
+                if (!am.Success)
+                {
+                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is not allowed", aCircuit.Viewer);
+                    return false;
+                }
+            }
+
+            if (m_DeniedClients != string.Empty)
+            {
+                Regex drx = new Regex(m_DeniedClients);
+                Match dm = drx.Match(aCircuit.Viewer);
+
+                if (dm.Success)
+                {
+                    m_log.InfoFormat("[GATEKEEPER SERVICE]: Login failed, reason: client {0} is denied", aCircuit.Viewer);
+                    return false;
+                }
+            }
+
+            //
+            // 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.IsAgentComingHome(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
+
+            bool isFirstLogin = false;
+            //
+            // Login the presence, if it's not there yet (by the login service)
+            //
+            PresenceInfo presence = m_PresenceService.GetAgent(aCircuit.SessionID);
+            if (presence != null) // it has been placed there by the login service
+                isFirstLogin = true;
+
+            else 
+                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;
+                try
+                {
+                    Uri uri = new Uri(aCircuit.ServiceURLs["HomeURI"].ToString());
+                    aCircuit.lastname = "@" + uri.Host; // + ":" + uri.Port;
+                }
+                catch
+                {
+                    m_log.WarnFormat("[GATEKEEPER SERVICE]: Malformed HomeURI (this should never happen): {0}", aCircuit.ServiceURLs["HomeURI"]);
+                    aCircuit.lastname = "@" + aCircuit.ServiceURLs["HomeURI"].ToString();
+                }
+            }
+
+            //
+            // Finally launch the agent at the destination
+            //
+            Constants.TeleportFlags loginFlag = isFirstLogin ? Constants.TeleportFlags.ViaLogin : Constants.TeleportFlags.ViaHGLogin;
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: launching agent {0}", loginFlag);
+            return m_SimulationService.CreateAgent(destination, aCircuit, (uint)loginFlag, 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;
+            }
+
+            if (userURL == m_ExternalName)
+            {
+                return m_UserAgentService.VerifyAgent(aCircuit.SessionID, aCircuit.ServiceSessionID);
+            }
+            else
+            {
+                IUserAgentService userAgentService = new UserAgentServiceConnector(userURL); 
+
+                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;
+
+            char[] trailing_slash = new char[] { '/' };
+            string addressee = parts[0].TrimEnd(trailing_slash);
+            string externalname = m_ExternalName.TrimEnd(trailing_slash);
+            m_log.DebugFormat("[GATEKEEPER SERVICE]: Verifying {0} against {1}", addressee, externalname);
+
+            return string.Equals(addressee, externalname, StringComparison.OrdinalIgnoreCase);
+        }
+
+        #endregion
+
+
+        #region Misc
+
+
+        #endregion
+    }
+}