mcs/class/corlib/System.Runtime.Remoting/RemotingServices.cs

   1 //
   2 // System.Runtime.Remoting.RemotingServices.cs
   3 //
   4 // Authors:
   5 //   Dietmar Maurer (dietmar@ximian.com)
   6 //   Lluis Sanchez Gual (lluis@ideary.com)
   7 //   Patrik Torstensson
   8 //
   9 // (C) 2001 Ximian, Inc.  http://www.ximian.com
  10 // Copyright (C) 2004, 2006 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System.Diagnostics;
  33 using System.Text;
  34 using System.Reflection;
  35 using System.Threading;
  36 using System.Collections;
  37 using System.Runtime.Remoting.Messaging;
  38 using System.Runtime.Remoting.Proxies;
  39 using System.Runtime.Remoting.Channels;
  40 using System.Runtime.Remoting.Contexts;
  41 using System.Runtime.Remoting.Activation;
  42 using System.Runtime.Remoting.Lifetime;
  43 using System.Runtime.CompilerServices;
  44 using System.Runtime.Serialization;
  45 using System.Runtime.Serialization.Formatters.Binary;
  46 using System.IO;
  47 using System.Runtime.Remoting.Services;
  48 using System.Security.Permissions;
  49 using System.Runtime.ConstrainedExecution;
  50 using System.Runtime.Serialization.Formatters;
  51
  52 namespace System.Runtime.Remoting
  53 {
  54         [System.Runtime.InteropServices.ComVisible (true)]
  55         static
  56         public class RemotingServices
  57         {
  58                 // Holds the identities of the objects, using uri as index
  59                 static Hashtable uri_hash = new Hashtable ();
  60
  61                 static BinaryFormatter _serializationFormatter;
  62                 static BinaryFormatter _deserializationFormatter;
  63
  64                 static string app_id;
  65                 static readonly object app_id_lock = new object ();
  66
  67                 static int next_id = 1;
  68                 const BindingFlags methodBindings = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
  69                 static readonly MethodInfo FieldSetterMethod;
  70                 static readonly MethodInfo FieldGetterMethod;
  71
  72                 // Holds information in xdomain calls. Names are short to minimize serialized size.
  73                 [Serializable]
  74                 class CACD {
  75                         public object d;        /* call data */
  76                         public object c;        /* call context */
  77                 }
  78
  79                 static RemotingServices ()
  80                 {
  81                         RemotingSurrogateSelector surrogateSelector = new RemotingSurrogateSelector ();
  82                         StreamingContext context = new StreamingContext (StreamingContextStates.Remoting, null);
  83                         _serializationFormatter = new BinaryFormatter (surrogateSelector, context);
  84                         _deserializationFormatter = new BinaryFormatter (null, context);
  85                         _serializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  86                         _deserializationFormatter.AssemblyFormat = FormatterAssemblyStyle.Full;
  87
  88                         RegisterInternalChannels ();
  89                         CreateWellKnownServerIdentity (typeof(RemoteActivator), "RemoteActivationService.rem", WellKnownObjectMode.Singleton);
  90
  91                         FieldSetterMethod = typeof(object).GetMethod ("FieldSetter", BindingFlags.NonPublic|BindingFlags.Instance);
  92                         FieldGetterMethod = typeof(object).GetMethod ("FieldGetter", BindingFlags.NonPublic|BindingFlags.Instance);
  93                 }
  94
  95                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  96                 internal extern static object InternalExecute (MethodBase method, Object obj,
  97                                                                Object[] parameters, out object [] out_args);
  98
  99                 // Returns the actual implementation of @method in @type.
 100                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 101                 internal extern static MethodBase GetVirtualMethod (Type type, MethodBase method);
 102
 103 #if DISABLE_REMOTING
 104                 public static bool IsTransparentProxy (object proxy)
 105                 {
 106                         throw new NotSupportedException ();
 107                 }
 108 #else
 109                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 110                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 111                 public extern static bool IsTransparentProxy (object proxy);
 112
 113                 internal static bool ProxyCheckCast (RealProxy rp, RuntimeType castType)
 114                 {
 115                         throw new NotImplementedException ("ProxyCheckCast");
 116                 }
 117 #endif
 118
 119                 internal static IMethodReturnMessage InternalExecuteMessage (
 120                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 121                 {
 122                         ReturnMessage result;
 123
 124                         Type tt = target.GetType ();
 125                         MethodBase method;
 126                         if (reqMsg.MethodBase.DeclaringType == tt ||
 127                             reqMsg.MethodBase == FieldSetterMethod ||
 128                             reqMsg.MethodBase == FieldGetterMethod) {
 129                                 method = reqMsg.MethodBase;
 130                         } else {
 131                                 method = GetVirtualMethod (tt, reqMsg.MethodBase);
 132
 133                                 if (method == null)
 134                                         throw new RemotingException (
 135                                                 String.Format ("Cannot resolve method {0}:{1}", tt, reqMsg.MethodName));
 136                         }
 137
 138                         if (reqMsg.MethodBase.IsGenericMethod) {
 139                                 Type[] genericArguments = reqMsg.MethodBase.GetGenericArguments ();
 140                                 MethodInfo gmd = ((MethodInfo)method).GetGenericMethodDefinition ();
 141                                 method = gmd.MakeGenericMethod (genericArguments);
 142                         }
 143
 144                         object oldContext = CallContext.SetCurrentCallContext (reqMsg.LogicalCallContext);
 145
 146                         try
 147                         {
 148                                 object [] out_args;
 149                                 object rval = InternalExecute (method, target, reqMsg.Args, out out_args);
 150
 151                                 // Collect parameters with Out flag from the request message
 152                                 // FIXME: This can be done in the unmanaged side and will be
 153                                 // more efficient
 154
 155                                 ParameterInfo[] parameters = method.GetParameters();
 156                                 object[] returnArgs = new object [parameters.Length];
 157
 158                                 int n = 0;
 159                                 int noa = 0;
 160                                 foreach (ParameterInfo par in parameters)
 161                                 {
 162                                         if (par.IsOut && !par.ParameterType.IsByRef)
 163                                                 returnArgs [n++] = reqMsg.GetArg (par.Position);
 164                                         else if (par.ParameterType.IsByRef)
 165                                                 returnArgs [n++] = out_args [noa++];
 166                                         else
 167                                                 returnArgs [n++] = null;
 168                                 }
 169
 170                                 result = new ReturnMessage (rval, returnArgs, n, ExecutionContext.CreateLogicalCallContext (true), reqMsg);
 171                         }
 172                         catch (Exception e)
 173                         {
 174                                 result = new ReturnMessage (e, reqMsg);
 175                         }
 176
 177                         CallContext.RestoreCallContext (oldContext);
 178                         return result;
 179                 }
 180
 181                 public static IMethodReturnMessage ExecuteMessage (
 182                         MarshalByRefObject target, IMethodCallMessage reqMsg)
 183                 {
 184                         if (IsTransparentProxy(target))
 185                         {
 186                                 // Message must go through all chain of sinks
 187                                 RealProxy rp = GetRealProxy (target);
 188                                 return (IMethodReturnMessage) rp.Invoke (reqMsg);
 189                         }
 190                         else    // Direct call
 191                                 return InternalExecuteMessage (target, reqMsg);
 192                 }
 193
 194                 [System.Runtime.InteropServices.ComVisible (true)]
 195                 public static object Connect (Type classToProxy, string url)
 196                 {
 197                         ObjRef objRef = new ObjRef (classToProxy, url, null);
 198                         return GetRemoteObject (objRef, classToProxy);
 199                 }
 200
 201                 [System.Runtime.InteropServices.ComVisible (true)]
 202                 public static object Connect (Type classToProxy, string url, object data)
 203                 {
 204                         ObjRef objRef = new ObjRef (classToProxy, url, data);
 205                         return GetRemoteObject (objRef, classToProxy);
 206                 }
 207
 208                 public static bool Disconnect (MarshalByRefObject obj)
 209                 {
 210                         if (obj == null) throw new ArgumentNullException ("obj");
 211
 212                         ServerIdentity identity;
 213
 214                         if (IsTransparentProxy (obj))
 215                         {
 216                                 // CBOs are always accessed through a proxy, even in the server, so
 217                                 // for server CBOs it is ok to disconnect a proxy
 218
 219                                 RealProxy proxy = GetRealProxy(obj);
 220                                 if (proxy.GetProxiedType().IsContextful && (proxy.ObjectIdentity is ServerIdentity))
 221                                         identity = proxy.ObjectIdentity as ServerIdentity;
 222                                 else
 223                                         throw new ArgumentException ("The obj parameter is a proxy.");
 224                         }
 225                         else {
 226                                 identity = obj.ObjectIdentity;
 227                                 obj.ObjectIdentity = null;
 228                         }
 229
 230                         if (identity == null || !identity.IsConnected)
 231                                 return false;
 232                         else
 233                         {
 234                                 LifetimeServices.StopTrackingLifetime (identity);
 235                                 DisposeIdentity (identity);
 236                                 TrackingServices.NotifyDisconnectedObject (obj);
 237                                 return true;
 238                         }
 239                 }
 240
 241                 public static Type GetServerTypeForUri (string URI)
 242                 {
 243                         ServerIdentity ident = GetIdentityForUri (URI) as ServerIdentity;
 244                         if (ident == null) return null;
 245                         return ident.ObjectType;
 246                 }
 247
 248                 public static string GetObjectUri (MarshalByRefObject obj)
 249                 {
 250                         Identity ident = GetObjectIdentity(obj);
 251                         if (ident is ClientIdentity) return ((ClientIdentity)ident).TargetUri;
 252                         else if (ident != null) return ident.ObjectUri;
 253                         else return null;
 254                 }
 255
 256                 public static object Unmarshal (ObjRef objectRef)
 257                 {
 258                         return Unmarshal (objectRef, true);
 259                 }
 260
 261                 public static object Unmarshal (ObjRef objectRef, bool fRefine)
 262                 {
 263                         Type classToProxy = fRefine ? objectRef.ServerType : typeof (MarshalByRefObject);
 264                         if (classToProxy == null) classToProxy = typeof (MarshalByRefObject);
 265
 266                         if (objectRef.IsReferenceToWellKnow) {
 267                                 object obj = GetRemoteObject (objectRef, classToProxy);
 268                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 269                                 return obj;
 270                         }
 271                         else
 272                         {
 273                                 object obj;
 274
 275                                 if (classToProxy.IsContextful) {
 276                                         // Look for a ProxyAttribute
 277                                         ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (classToProxy, typeof(ProxyAttribute), true);
 278                                         if (att != null) {
 279                                                 obj = att.CreateProxy (objectRef, classToProxy, null, null).GetTransparentProxy();
 280                                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 281                                                 return obj;
 282                                         }
 283                                 }
 284                                 obj = GetProxyForRemoteObject (objectRef, classToProxy);
 285                                 TrackingServices.NotifyUnmarshaledObject (obj, objectRef);
 286                                 return obj;
 287                         }
 288                 }
 289
 290                 public static ObjRef Marshal (MarshalByRefObject Obj)
 291                 {
 292                         return Marshal (Obj, null, null);
 293                 }
 294
 295                 public static ObjRef Marshal (MarshalByRefObject Obj, string URI)
 296                 {
 297                         return Marshal (Obj, URI, null);
 298                 }
 299
 300                 public static ObjRef Marshal (MarshalByRefObject Obj, string ObjURI, Type RequestedType)
 301                 {
 302                         if (IsTransparentProxy (Obj))
 303                         {
 304                                 RealProxy proxy = RemotingServices.GetRealProxy (Obj);
 305                                 Identity identity = proxy.ObjectIdentity;
 306
 307                                 if (identity != null)
 308                                 {
 309                                         if (proxy.GetProxiedType().IsContextful && !identity.IsConnected)
 310                                         {
 311                                                 // Unregistered local contextbound object. Register now.
 312                                                 ClientActivatedIdentity cboundIdentity = (ClientActivatedIdentity)identity;
 313                                                 if (ObjURI == null) ObjURI = NewUri();
 314                                                 cboundIdentity.ObjectUri = ObjURI;
 315                                                 RegisterServerIdentity (cboundIdentity);
 316                                                 cboundIdentity.StartTrackingLifetime ((ILease)Obj.InitializeLifetimeService());
 317                                                 return cboundIdentity.CreateObjRef (RequestedType);
 318                                         }
 319                                         else if (ObjURI != null)
 320                                                 throw new RemotingException ("It is not possible marshal a proxy of a remote object.");
 321
 322                                         ObjRef or = proxy.ObjectIdentity.CreateObjRef (RequestedType);
 323                                         TrackingServices.NotifyMarshaledObject (Obj, or);
 324                                         return or;
 325                                 }
 326                         }
 327
 328                         if (RequestedType == null) RequestedType = Obj.GetType ();
 329
 330                         if (ObjURI == null)
 331                         {
 332                                 if (Obj.ObjectIdentity == null)
 333                                 {
 334                                         ObjURI = NewUri();
 335                                         CreateClientActivatedServerIdentity (Obj, RequestedType, ObjURI);
 336                                 }
 337                         }
 338                         else
 339                         {
 340                                 ClientActivatedIdentity identity = GetIdentityForUri ("/" + ObjURI) as ClientActivatedIdentity;
 341                                 if (identity == null || Obj != identity.GetServerObject())
 342                                         CreateClientActivatedServerIdentity (Obj, RequestedType, ObjURI);
 343                         }
 344
 345                         ObjRef oref;
 346
 347                         if (IsTransparentProxy (Obj))
 348                                 oref = RemotingServices.GetRealProxy (Obj).ObjectIdentity.CreateObjRef (RequestedType);
 349                         else
 350                                 oref = Obj.CreateObjRef (RequestedType);
 351
 352                         TrackingServices.NotifyMarshaledObject (Obj, oref);
 353                         return oref;
 354                 }
 355
 356                 static string NewUri ()
 357                 {
 358                         if (app_id == null) {
 359                                 lock (app_id_lock) {
 360                                         if (app_id == null)
 361                                                 app_id = Guid.NewGuid().ToString().Replace('-', '_') + "/";
 362                                 }
 363                         }
 364
 365                         int n = Interlocked.Increment (ref next_id);
 366                         return app_id + Environment.TickCount.ToString("x") + "_" + n + ".rem";
 367                 }
 368
 369                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 370                 public static RealProxy GetRealProxy (object proxy)
 371                 {
 372                         if (!IsTransparentProxy(proxy)) throw new RemotingException("Cannot get the real proxy from an object that is not a transparent proxy.");
 373                         return (RealProxy)((TransparentProxy)proxy)._rp;
 374                 }
 375
 376                 public static MethodBase GetMethodBaseFromMethodMessage(IMethodMessage msg)
 377                 {
 378                         Type type = Type.GetType (msg.TypeName);
 379                         if (type == null)
 380                                 throw new RemotingException ("Type '" + msg.TypeName + "' not found.");
 381
 382                         return GetMethodBaseFromName (type, msg.MethodName, (Type[]) msg.MethodSignature);
 383                 }
 384
 385                 internal static MethodBase GetMethodBaseFromName (Type type, string methodName, Type[] signature)
 386                 {
 387                         if (type.IsInterface) {
 388                                 return FindInterfaceMethod (type, methodName, signature);
 389                         }
 390                         else {
 391                                 MethodBase method = null;
 392                                 if (signature == null)
 393                                         method = type.GetMethod (methodName, methodBindings);
 394                                 else
 395                                         method = type.GetMethod (methodName, methodBindings, null, (Type[]) signature, null);
 396
 397                                 if (method != null)
 398                                         return method;
 399
 400                                 if (methodName == "FieldSetter")
 401                                         return FieldSetterMethod;
 402
 403                                 if (methodName == "FieldGetter")
 404                                         return FieldGetterMethod;
 405
 406                                 if (signature == null)
 407                                         return type.GetConstructor (methodBindings, null, Type.EmptyTypes, null);
 408                                 else
 409                                         return type.GetConstructor (methodBindings, null, signature, null);
 410                         }
 411                 }
 412
 413                 static MethodBase FindInterfaceMethod (Type type, string methodName, Type[] signature)
 414                 {
 415                         MethodBase method = null;
 416
 417                         if (signature == null)
 418                                 method = type.GetMethod (methodName, methodBindings);
 419                         else
 420                                 method = type.GetMethod (methodName, methodBindings, null, signature, null);
 421
 422                         if (method != null) return method;
 423
 424                         foreach (Type t in type.GetInterfaces ()) {
 425                                 method = FindInterfaceMethod (t, methodName, signature);
 426                                 if (method != null) return method;
 427                         }
 428
 429                         return null;
 430                 }
 431
 432                 public static void GetObjectData(object obj, SerializationInfo info, StreamingContext context)
 433                 {
 434                         if (obj == null) throw new ArgumentNullException ("obj");
 435
 436                         ObjRef oref = Marshal ((MarshalByRefObject)obj);
 437                         oref.GetObjectData (info, context);
 438                 }
 439
 440                 public static ObjRef GetObjRefForProxy(MarshalByRefObject obj)
 441                 {
 442                         Identity ident = GetObjectIdentity(obj);
 443                         if (ident == null) return null;
 444                         else return ident.CreateObjRef(null);
 445                 }
 446
 447                 public static object GetLifetimeService (MarshalByRefObject obj)
 448                 {
 449                         if (obj == null) return null;
 450                         return obj.GetLifetimeService ();
 451                 }
 452
 453                 public static IMessageSink GetEnvoyChainForProxy (MarshalByRefObject obj)
 454                 {
 455                         if (IsTransparentProxy(obj))
 456                                 return ((ClientIdentity)GetRealProxy (obj).ObjectIdentity).EnvoySink;
 457                         else
 458                                 throw new ArgumentException ("obj must be a proxy.","obj");
 459                 }
 460
 461                 [MonoTODO]
 462                 [Conditional ("REMOTING_PERF")]
 463                 [Obsolete ("It existed for only internal use in .NET and unimplemented in mono")]
 464                 public static void LogRemotingStage (int stage)
 465                 {
 466                         throw new NotImplementedException ();
 467                 }
 468
 469                 public static string GetSessionIdForMethodMessage(IMethodMessage msg)
 470                 {
 471                         // It seems that this it what MS returns.
 472                         return msg.Uri;
 473                 }
 474
 475                 public static bool IsMethodOverloaded(IMethodMessage msg)
 476                 {
 477                         const BindingFlags bfinst = BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance;
 478                         MonoType type = (MonoType) msg.MethodBase.DeclaringType;
 479                         return type.GetMethodsByName (msg.MethodName, bfinst, false, type).Length > 1;
 480                 }
 481
 482                 public static bool IsObjectOutOfAppDomain(object tp)
 483                 {
 484                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 485
 486                         if (mbr == null)
 487                                 return false;
 488
 489                         // TODO: use internal call for better performance
 490                         Identity ident = GetObjectIdentity (mbr);
 491                         return ident is ClientIdentity;
 492                 }
 493
 494                 public static bool IsObjectOutOfContext(object tp)
 495                 {
 496                         MarshalByRefObject mbr = tp as MarshalByRefObject;
 497
 498                         if (mbr == null)
 499                                 return false;
 500
 501                         // TODO: use internal call for better performance
 502                         Identity ident = GetObjectIdentity (mbr);
 503                         if (ident == null) return false;
 504
 505                         ServerIdentity sident = ident as ServerIdentity;
 506                         if (sident != null) return sident.Context != System.Threading.Thread.CurrentContext;
 507                         else return true;
 508                 }
 509
 510                 public static bool IsOneWay(MethodBase method)
 511                 {
 512                         return method.IsDefined (typeof (OneWayAttribute), false);
 513                 }
 514
 515                 internal static bool IsAsyncMessage(IMessage msg)
 516                 {
 517                         if (! (msg is MonoMethodMessage)) return false;
 518                         else if (((MonoMethodMessage)msg).IsAsync) return true;
 519                         else if (IsOneWay (((MonoMethodMessage)msg).MethodBase)) return true;
 520                         else return false;
 521                 }
 522
 523                 public static void SetObjectUriForMarshal(MarshalByRefObject obj, string uri)
 524                 {
 525                         if (IsTransparentProxy (obj)) {
 526                                 RealProxy proxy = RemotingServices.GetRealProxy(obj);
 527                                 Identity identity = proxy.ObjectIdentity;
 528
 529                                 if (identity != null && !(identity is ServerIdentity) && !proxy.GetProxiedType().IsContextful)
 530                                         throw new RemotingException ("SetObjectUriForMarshal method should only be called for MarshalByRefObjects that exist in the current AppDomain.");
 531                         }
 532
 533                         Marshal (obj, uri);
 534                 }
 535
 536                 #region Internal Methods
 537
 538                 internal static object CreateClientProxy (ActivatedClientTypeEntry entry, object[] activationAttributes)
 539                 {
 540                         if (entry.ContextAttributes != null || activationAttributes != null)
 541                         {
 542                                 ArrayList props = new ArrayList ();
 543                                 if (entry.ContextAttributes != null) props.AddRange (entry.ContextAttributes);
 544                                 if (activationAttributes != null) props.AddRange (activationAttributes);
 545                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, props.ToArray ());
 546                         }
 547                         else
 548                                 return CreateClientProxy (entry.ObjectType, entry.ApplicationUrl, null);
 549                 }
 550
 551                 internal static object CreateClientProxy (Type objectType, string url, object[] activationAttributes)
 552                 {
 553                         string activationUrl = url;
 554                         if (!activationUrl.EndsWith ("/"))
 555                                 activationUrl += "/";
 556                         activationUrl += "RemoteActivationService.rem";
 557
 558                         string objectUri;
 559                         GetClientChannelSinkChain (activationUrl, null, out objectUri);
 560
 561                         RemotingProxy proxy = new RemotingProxy (objectType, activationUrl, activationAttributes);
 562                         return proxy.GetTransparentProxy();
 563                 }
 564
 565                 internal static object CreateClientProxy (WellKnownClientTypeEntry entry)
 566                 {
 567                         return Connect (entry.ObjectType, entry.ObjectUrl, null);
 568                 }
 569
 570                 internal static object CreateClientProxyForContextBound (Type type, object[] activationAttributes)
 571                 {
 572                         if (type.IsContextful)
 573                         {
 574                                 // Look for a ProxyAttribute
 575                                 ProxyAttribute att = (ProxyAttribute) Attribute.GetCustomAttribute (type, typeof(ProxyAttribute), true);
 576                                 if (att != null)
 577                                         return att.CreateInstance (type);
 578                         }
 579                         RemotingProxy proxy = new RemotingProxy (type, ChannelServices.CrossContextUrl, activationAttributes);
 580                         return proxy.GetTransparentProxy();
 581                 }
 582 #if !NET_2_1
 583                 internal static object CreateClientProxyForComInterop (Type type)
 584                 {
 585                         Mono.Interop.ComInteropProxy proxy = Mono.Interop.ComInteropProxy.CreateProxy (type);
 586                         return proxy.GetTransparentProxy ();
 587                 }
 588 #endif
 589                 internal static Identity GetIdentityForUri (string uri)
 590                 {
 591                         string normUri = GetNormalizedUri (uri);
 592                         lock (uri_hash)
 593                         {
 594                                 Identity i = (Identity) uri_hash [normUri];
 595
 596                                 if (i == null) {
 597                                         normUri = RemoveAppNameFromUri (uri);
 598                                         if (normUri != null)
 599                                                 i = (Identity) uri_hash [normUri];
 600                                 }
 601
 602                                 return i;
 603                         }
 604                 }
 605
 606                 //
 607                 // If the specified uri starts with the application name,
 608                 // RemoveAppNameFromUri returns the uri w/out the leading
 609                 // application name, otherwise it returns null.
 610                 //
 611                 // Assumes that the uri is not normalized.
 612                 //
 613                 static string RemoveAppNameFromUri (string uri)
 614                 {
 615                         string name = RemotingConfiguration.ApplicationName;
 616                         if (name == null) return null;
 617                         name = "/" + name + "/";
 618                         if (uri.StartsWith (name))
 619                                 return uri.Substring (name.Length);
 620                         else
 621                                 return null;
 622                 }
 623
 624                 internal static Identity GetObjectIdentity (MarshalByRefObject obj)
 625                 {
 626                         if (IsTransparentProxy(obj))
 627                                 return GetRealProxy (obj).ObjectIdentity;
 628                         else
 629                                 return obj.ObjectIdentity;
 630                 }
 631
 632                 internal static ClientIdentity GetOrCreateClientIdentity(ObjRef objRef, Type proxyType, out object clientProxy)
 633                 {
 634                         // This method looks for an identity for the given url.
 635                         // If an identity is not found, it creates the identity and
 636                         // assigns it a proxy to the remote object.
 637
 638                         // Creates the client sink chain for the given url or channelData.
 639                         // It will also get the object uri from the url.
 640
 641                         object channelData = objRef.ChannelInfo != null ? objRef.ChannelInfo.ChannelData : null;
 642
 643                         string objectUri;
 644                         IMessageSink sink = GetClientChannelSinkChain (objRef.URI, channelData, out objectUri);
 645
 646                         if (objectUri == null) objectUri = objRef.URI;
 647
 648                         lock (uri_hash)
 649                         {
 650                                 clientProxy = null;
 651                                 string uri = GetNormalizedUri (objRef.URI);
 652
 653                                 ClientIdentity identity = uri_hash [uri] as ClientIdentity;
 654                                 if (identity != null)
 655                                 {
 656                                         // Object already registered
 657                                         clientProxy = identity.ClientProxy;
 658                                         if (clientProxy != null) return identity;
 659
 660                                         // The proxy has just been GCed, so its identity cannot
 661                                         // be reused. Just dispose it.
 662                                         DisposeIdentity (identity);
 663                                 }
 664
 665                                 // Creates an identity and a proxy for the remote object
 666
 667                                 identity = new ClientIdentity (objectUri, objRef);
 668                                 identity.ChannelSink = sink;
 669
 670                                 // Registers the identity
 671                                 uri_hash [uri] = identity;
 672                                 if (proxyType != null)
 673                                 {
 674                                         RemotingProxy proxy = new RemotingProxy (proxyType, identity);
 675                                         CrossAppDomainSink cds = sink as CrossAppDomainSink;
 676                                         if (cds != null)
 677                                                 proxy.SetTargetDomain (cds.TargetDomainId);
 678
 679                                         clientProxy = proxy.GetTransparentProxy();
 680                                         identity.ClientProxy = (MarshalByRefObject) clientProxy;
 681                                 }
 682                                 return identity;
 683                         }
 684                 }
 685
 686                 static IMessageSink GetClientChannelSinkChain(string url, object channelData, out string objectUri)
 687                 {
 688                         IMessageSink sink = ChannelServices.CreateClientChannelSinkChain (url, channelData, out objectUri);
 689                         if (sink == null)
 690                         {
 691                                 if (url != null)
 692                                 {
 693                                         string msg = String.Format ("Cannot create channel sink to connect to URL {0}. An appropriate channel has probably not been registered.", url);
 694                                         throw new RemotingException (msg);
 695                                 }
 696                                 else
 697                                 {
 698                                         string msg = String.Format ("Cannot create channel sink to connect to the remote object. An appropriate channel has probably not been registered.", url);
 699                                         throw new RemotingException (msg);
 700                                 }
 701                         }
 702                         return sink;
 703                 }
 704
 705                 internal static ClientActivatedIdentity CreateContextBoundObjectIdentity(Type objectType)
 706                 {
 707                         ClientActivatedIdentity identity = new ClientActivatedIdentity (null, objectType);
 708                         identity.ChannelSink = ChannelServices.CrossContextChannel;
 709                         return identity;
 710                 }
 711
 712                 internal static ClientActivatedIdentity CreateClientActivatedServerIdentity(MarshalByRefObject realObject, Type objectType, string objectUri)
 713                 {
 714                         ClientActivatedIdentity identity = new ClientActivatedIdentity (objectUri, objectType);
 715                         identity.AttachServerObject (realObject, Context.DefaultContext);
 716                         RegisterServerIdentity (identity);
 717                         identity.StartTrackingLifetime ((ILease)realObject.InitializeLifetimeService ());
 718                         return identity;
 719                 }
 720
 721                 internal static ServerIdentity CreateWellKnownServerIdentity(Type objectType, string objectUri, WellKnownObjectMode mode)
 722                 {
 723                         ServerIdentity identity;
 724
 725                         if (mode == WellKnownObjectMode.SingleCall)
 726                                 identity = new  SingleCallIdentity(objectUri, Context.DefaultContext, objectType);
 727                         else
 728                                 identity = new  SingletonIdentity(objectUri, Context.DefaultContext, objectType);
 729
 730                         RegisterServerIdentity (identity);
 731                         return identity;
 732                 }
 733
 734                 private static void RegisterServerIdentity(ServerIdentity identity)
 735                 {
 736                         lock (uri_hash)
 737                         {
 738                                 if (uri_hash.ContainsKey (identity.ObjectUri))
 739                                         throw new RemotingException ("Uri already in use: " + identity.ObjectUri + ".");
 740
 741                                 uri_hash[identity.ObjectUri] = identity;
 742                         }
 743                 }
 744
 745                 internal static object GetProxyForRemoteObject (ObjRef objref, Type classToProxy)
 746                 {
 747                         ClientActivatedIdentity identity = GetIdentityForUri (objref.URI) as ClientActivatedIdentity;
 748                         if (identity != null) return identity.GetServerObject ();
 749                         else return GetRemoteObject (objref, classToProxy);
 750                 }
 751
 752                 internal static object GetRemoteObject(ObjRef objRef, Type proxyType)
 753                 {
 754                         object proxy;
 755                         GetOrCreateClientIdentity (objRef, proxyType, out proxy);
 756                         return proxy;
 757                 }
 758
 759                 // This method is called by the runtime
 760                 internal static object GetServerObject (string uri)
 761                 {
 762                         ClientActivatedIdentity identity = GetIdentityForUri (uri) as ClientActivatedIdentity;
 763                         if (identity == null) throw new RemotingException ("Server for uri '" + uri + "' not found");
 764                         return identity.GetServerObject ();
 765                 }
 766
 767                 // This method is called by the runtime
 768                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 769                 internal static byte[] SerializeCallData (object obj)
 770                 {
 771                         LogicalCallContext ctx = ExecutionContext.CreateLogicalCallContext (false);
 772                         if (ctx != null) {
 773                                 CACD cad = new CACD ();
 774                                 cad.d = obj;
 775                                 cad.c = ctx;
 776                                 obj = cad;
 777                         }
 778
 779                         if (obj == null) return null;
 780                         MemoryStream ms = new MemoryStream ();
 781                         _serializationFormatter.Serialize (ms, obj);
 782                         return ms.ToArray ();
 783                 }
 784
 785                 // This method is called by the runtime
 786                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 787                 internal static object DeserializeCallData (byte[] array)
 788                 {
 789                         if (array == null) return null;
 790
 791                         MemoryStream ms = new MemoryStream (array);
 792                         object obj = _deserializationFormatter.Deserialize (ms);
 793
 794                         if (obj is CACD) {
 795                                 CACD cad = (CACD) obj;
 796                                 obj = cad.d;
 797                                 CallContext.UpdateCurrentLogicalCallContext ((LogicalCallContext) cad.c);
 798                         }
 799                         return obj;
 800                 }
 801
 802                 // This method is called by the runtime
 803                 [SecurityPermission (SecurityAction.Assert, SerializationFormatter = true)] // FIXME: to be reviewed
 804                 internal static byte[] SerializeExceptionData (Exception ex)
 805                 {
 806                         try {
 807                                 int retry = 4;
 808
 809                                 do {
 810                                         try {
 811                                                 MemoryStream ms = new MemoryStream ();
 812                                                 _serializationFormatter.Serialize (ms, ex);
 813                                                 return ms.ToArray ();
 814                                         }
 815                                         catch (Exception e) {
 816                                                 if (e is ThreadAbortException) {
 817                                                         Thread.ResetAbort ();
 818                                                         retry = 5;
 819                                                         ex = e;
 820                                                 }
 821                                                 else if (retry == 2) {
 822                                                         ex = new Exception ();
 823                                                         ex.SetMessage (e.Message);
 824                                                         ex.SetStackTrace (e.StackTrace);
 825                                                 }
 826                                                 else
 827                                                         ex = e;
 828                                         }
 829                                         retry--;
 830                                 }
 831                                 while (retry > 0);
 832
 833                                 return null;
 834                         }
 835                         catch (Exception tex)
 836                         {
 837                                 byte[] data = SerializeExceptionData (tex);
 838                                 Thread.ResetAbort ();
 839                                 return data;
 840                         }
 841                 }
 842
 843                 internal static object GetDomainProxy(AppDomain domain)
 844                 {
 845                         byte[] data = null;
 846
 847                         Context currentContext = Thread.CurrentContext;
 848
 849                         try
 850                         {
 851                                 data = (byte[])AppDomain.InvokeInDomain (domain, typeof (AppDomain).GetMethod ("GetMarshalledDomainObjRef", BindingFlags.Instance|BindingFlags.NonPublic), domain, null);
 852                         }
 853                         finally
 854                         {
 855                                 AppDomain.InternalSetContext (currentContext);
 856                         }
 857
 858                         byte[] data_copy = new byte [data.Length];
 859                         data.CopyTo (data_copy, 0);
 860                         MemoryStream stream = new MemoryStream (data_copy);
 861                         ObjRef appref = (ObjRef) CADSerializer.DeserializeObject (stream);
 862                         return (AppDomain) RemotingServices.Unmarshal(appref);
 863                 }
 864
 865                 private static void RegisterInternalChannels()
 866                 {
 867                         CrossAppDomainChannel.RegisterCrossAppDomainChannel();
 868                 }
 869
 870                 internal static void DisposeIdentity (Identity ident)
 871                 {
 872                         lock (uri_hash)
 873                         {
 874                                 if (!ident.Disposed) {
 875                                         ClientIdentity clientId = ident as ClientIdentity;
 876                                         if (clientId != null)
 877                                                 uri_hash.Remove (GetNormalizedUri (clientId.TargetUri));
 878                                         else
 879                                                 uri_hash.Remove (ident.ObjectUri);
 880
 881                                         ident.Disposed = true;
 882                                 }
 883                         }
 884                 }
 885
 886                 internal static Identity GetMessageTargetIdentity (IMessage msg)
 887                 {
 888                         // Returns the identity where the message is sent
 889
 890                         if (msg is IInternalMessage)
 891                                 return ((IInternalMessage)msg).TargetIdentity;
 892
 893                         lock (uri_hash)
 894                         {
 895                                 string uri = GetNormalizedUri (((IMethodMessage)msg).Uri);
 896                                 return uri_hash [uri] as ServerIdentity;
 897                         }
 898                 }
 899
 900                 internal static void SetMessageTargetIdentity (IMessage msg, Identity ident)
 901                 {
 902                         if (msg is IInternalMessage)
 903                                 ((IInternalMessage)msg).TargetIdentity = ident;
 904                 }
 905
 906                 internal static bool UpdateOutArgObject (ParameterInfo pi, object local, object remote)
 907                 {
 908                         if (pi.ParameterType.IsArray && ((Array)local).Rank == 1)
 909                         {
 910                                 Array alocal = (Array) local;
 911                                 if (alocal.Rank == 1)
 912                                 {
 913                                         Array.Copy ((Array) remote, alocal, alocal.Length);
 914                                         return true;
 915                                 }
 916                                 else
 917                                 {
 918                                         // TODO
 919                                 }
 920                         }
 921                         return false;
 922                 }
 923
 924                 static string GetNormalizedUri (string uri)
 925                 {
 926                         if (uri.StartsWith ("/")) return uri.Substring (1);
 927                         else return uri;
 928                 }
 929
 930                 #endregion
 931         }
 932 }