gio/gdbusinterfaceskeleton.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include "gdbusinterface.h"
  26 #include "gdbusinterfaceskeleton.h"
  27 #include "gdbusobjectskeleton.h"
  28 #include "gioenumtypes.h"
  29 #include "gdbusprivate.h"
  30 #include "gdbusmethodinvocation.h"
  31 #include "gdbusconnection.h"
  32 #include "gioscheduler.h"
  33 #include "gioerror.h"
  34
  35 #include "glibintl.h"
  36
  37 /**
  38  * SECTION:gdbusinterfaceskeleton
  39  * @short_description: Service-side D-Bus interface
  40  * @include: gio/gio.h
  41  *
  42  * Abstract base class for D-Bus interfaces on the service side.
  43  */
  44
  45 struct _GDBusInterfaceSkeletonPrivate
  46 {
  47   GMutex                      lock;
  48
  49   GDBusObject                *object;
  50   GDBusInterfaceSkeletonFlags flags;
  51
  52   GSList                     *connections;   /* List of ConnectionData */
  53   gchar                      *object_path;   /* The object path for this skeleton */
  54   GDBusInterfaceVTable       *hooked_vtable;
  55 };
  56
  57 typedef struct
  58 {
  59   GDBusConnection *connection;
  60   guint            registration_id;
  61 } ConnectionData;
  62
  63 enum
  64 {
  65   G_AUTHORIZE_METHOD_SIGNAL,
  66   LAST_SIGNAL
  67 };
  68
  69 enum
  70 {
  71   PROP_0,
  72   PROP_G_FLAGS
  73 };
  74
  75 static guint signals[LAST_SIGNAL] = {0};
  76
  77 static void     dbus_interface_interface_init                      (GDBusInterfaceIface    *iface);
  78
  79 static void     set_object_path_locked                             (GDBusInterfaceSkeleton *interface_,
  80                                                                     const gchar            *object_path);
  81 static void     remove_connection_locked                           (GDBusInterfaceSkeleton *interface_,
  82                                                                     GDBusConnection        *connection);
  83 static void     skeleton_intercept_handle_method_call              (GDBusConnection        *connection,
  84                                                                     const gchar            *sender,
  85                                                                     const gchar            *object_path,
  86                                                                     const gchar            *interface_name,
  87                                                                     const gchar            *method_name,
  88                                                                     GVariant               *parameters,
  89                                                                     GDBusMethodInvocation  *invocation,
  90                                                                     gpointer                user_data);
  91
  92
  93 G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GDBusInterfaceSkeleton, g_dbus_interface_skeleton, G_TYPE_OBJECT,
  94                                   G_IMPLEMENT_INTERFACE (G_TYPE_DBUS_INTERFACE, dbus_interface_interface_init));
  95
  96 static void
  97 g_dbus_interface_skeleton_finalize (GObject *object)
  98 {
  99   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
 100
 101   /* Hold the lock just incase any code we call verifies that the lock is held */
 102   g_mutex_lock (&interface->priv->lock);
 103
 104   /* unexport from all connections if we're exported anywhere */
 105   while (interface->priv->connections != NULL)
 106     {
 107       ConnectionData *data = interface->priv->connections->data;
 108       remove_connection_locked (interface, data->connection);
 109     }
 110
 111   set_object_path_locked (interface, NULL);
 112
 113   g_mutex_unlock (&interface->priv->lock);
 114
 115   g_free (interface->priv->hooked_vtable);
 116
 117   if (interface->priv->object != NULL)
 118     g_object_remove_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
 119
 120   g_mutex_clear (&interface->priv->lock);
 121
 122   G_OBJECT_CLASS (g_dbus_interface_skeleton_parent_class)->finalize (object);
 123 }
 124
 125 static void
 126 g_dbus_interface_skeleton_get_property (GObject      *object,
 127                                         guint         prop_id,
 128                                         GValue       *value,
 129                                         GParamSpec   *pspec)
 130 {
 131   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
 132
 133   switch (prop_id)
 134     {
 135     case PROP_G_FLAGS:
 136       g_value_set_flags (value, g_dbus_interface_skeleton_get_flags (interface));
 137       break;
 138
 139     default:
 140       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 141       break;
 142     }
 143 }
 144
 145 static void
 146 g_dbus_interface_skeleton_set_property (GObject      *object,
 147                                         guint         prop_id,
 148                                         const GValue *value,
 149                                         GParamSpec   *pspec)
 150 {
 151   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (object);
 152
 153   switch (prop_id)
 154     {
 155     case PROP_G_FLAGS:
 156       g_dbus_interface_skeleton_set_flags (interface, g_value_get_flags (value));
 157       break;
 158
 159     default:
 160       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 161       break;
 162     }
 163 }
 164
 165 static gboolean
 166 g_dbus_interface_skeleton_g_authorize_method_default (GDBusInterfaceSkeleton    *interface,
 167                                                       GDBusMethodInvocation *invocation)
 168 {
 169   return TRUE;
 170 }
 171
 172 static void
 173 g_dbus_interface_skeleton_class_init (GDBusInterfaceSkeletonClass *klass)
 174 {
 175   GObjectClass *gobject_class;
 176
 177   gobject_class = G_OBJECT_CLASS (klass);
 178   gobject_class->finalize     = g_dbus_interface_skeleton_finalize;
 179   gobject_class->set_property = g_dbus_interface_skeleton_set_property;
 180   gobject_class->get_property = g_dbus_interface_skeleton_get_property;
 181
 182   klass->g_authorize_method = g_dbus_interface_skeleton_g_authorize_method_default;
 183
 184   /**
 185    * GDBusInterfaceSkeleton:g-flags:
 186    *
 187    * Flags from the #GDBusInterfaceSkeletonFlags enumeration.
 188    *
 189    * Since: 2.30
 190    */
 191   g_object_class_install_property (gobject_class,
 192                                    PROP_G_FLAGS,
 193                                    g_param_spec_flags ("g-flags",
 194                                                        "g-flags",
 195                                                        "Flags for the interface skeleton",
 196                                                        G_TYPE_DBUS_INTERFACE_SKELETON_FLAGS,
 197                                                        G_DBUS_INTERFACE_SKELETON_FLAGS_NONE,
 198                                                        G_PARAM_READABLE |
 199                                                        G_PARAM_WRITABLE |
 200                                                        G_PARAM_STATIC_STRINGS));
 201
 202   /**
 203    * GDBusInterfaceSkeleton::g-authorize-method:
 204    * @interface: The #GDBusInterfaceSkeleton emitting the signal.
 205    * @invocation: A #GDBusMethodInvocation.
 206    *
 207    * Emitted when a method is invoked by a remote caller and used to
 208    * determine if the method call is authorized.
 209    *
 210    * Note that this signal is emitted in a thread dedicated to
 211    * handling the method call so handlers are allowed to perform
 212    * blocking IO. This means that it is appropriate to call
 213    * e.g. <ulink
 214    * url="http://hal.freedesktop.org/docs/polkit/PolkitAuthority.html#polkit-authority-check-authorization-sync">polkit_authority_check_authorization_sync()</ulink>
 215    * with the <ulink
 216    * url="http://hal.freedesktop.org/docs/polkit/PolkitAuthority.html#POLKIT-CHECK-AUTHORIZATION-FLAGS-ALLOW-USER-INTERACTION:CAPS">POLKIT_CHECK_AUTHORIZATION_FLAGS_ALLOW_USER_INTERACTION</ulink> flag set.
 217    *
 218    * If %FALSE is returned then no further handlers are run and the
 219    * signal handler must take a reference to @invocation and finish
 220    * handling the call (e.g. return an error via
 221    * g_dbus_method_invocation_return_error()).
 222    *
 223    * Otherwise, if %TRUE is returned, signal emission continues. If no
 224    * handlers return %FALSE, then the method is dispatched. If
 225    * @interface has an enclosing #GDBusObjectSkeleton, then the
 226    * #GDBusObjectSkeleton::authorize-method signal handlers run before
 227    * the handlers for this signal.
 228    *
 229    * The default class handler just returns %TRUE.
 230    *
 231    * Please note that the common case is optimized: if no signals
 232    * handlers are connected and the default class handler isn't
 233    * overridden (for both @interface and the enclosing
 234    * #GDBusObjectSkeleton, if any) and #GDBusInterfaceSkeleton:g-flags does
 235    * not have the
 236    * %G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD
 237    * flags set, no dedicated thread is ever used and the call will be
 238    * handled in the same thread as the object that @interface belongs
 239    * to was exported in.
 240    *
 241    * Returns: %TRUE if the call is authorized, %FALSE otherwise.
 242    *
 243    * Since: 2.30
 244    */
 245   signals[G_AUTHORIZE_METHOD_SIGNAL] =
 246     g_signal_new ("g-authorize-method",
 247                   G_TYPE_DBUS_INTERFACE_SKELETON,
 248                   G_SIGNAL_RUN_LAST,
 249                   G_STRUCT_OFFSET (GDBusInterfaceSkeletonClass, g_authorize_method),
 250                   _g_signal_accumulator_false_handled,
 251                   NULL,
 252                   NULL,
 253                   G_TYPE_BOOLEAN,
 254                   1,
 255                   G_TYPE_DBUS_METHOD_INVOCATION);
 256
 257   g_type_class_add_private (klass, sizeof (GDBusInterfaceSkeletonPrivate));
 258 }
 259
 260 static void
 261 g_dbus_interface_skeleton_init (GDBusInterfaceSkeleton *interface)
 262 {
 263   interface->priv = G_TYPE_INSTANCE_GET_PRIVATE (interface, G_TYPE_DBUS_INTERFACE_SKELETON, GDBusInterfaceSkeletonPrivate);
 264   g_mutex_init (&interface->priv->lock);
 265 }
 266
 267 /* ---------------------------------------------------------------------------------------------------- */
 268
 269 /**
 270  * g_dbus_interface_skeleton_get_flags:
 271  * @interface_: A #GDBusInterfaceSkeleton.
 272  *
 273  * Gets the #GDBusInterfaceSkeletonFlags that describes what the behavior
 274  * of @interface_
 275  *
 276  * Returns: One or more flags from the #GDBusInterfaceSkeletonFlags enumeration.
 277  *
 278  * Since: 2.30
 279  */
 280 GDBusInterfaceSkeletonFlags
 281 g_dbus_interface_skeleton_get_flags (GDBusInterfaceSkeleton  *interface_)
 282 {
 283   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), G_DBUS_INTERFACE_SKELETON_FLAGS_NONE);
 284   return interface_->priv->flags;
 285 }
 286
 287 /**
 288  * g_dbus_interface_skeleton_set_flags:
 289  * @interface_: A #GDBusInterfaceSkeleton.
 290  * @flags: Flags from the #GDBusInterfaceSkeletonFlags enumeration.
 291  *
 292  * Sets flags describing what the behavior of @skeleton should be.
 293  *
 294  * Since: 2.30
 295  */
 296 void
 297 g_dbus_interface_skeleton_set_flags (GDBusInterfaceSkeleton      *interface_,
 298                                      GDBusInterfaceSkeletonFlags  flags)
 299 {
 300   g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
 301   g_mutex_lock (&interface_->priv->lock);
 302   if (interface_->priv->flags != flags)
 303     {
 304       interface_->priv->flags = flags;
 305       g_mutex_unlock (&interface_->priv->lock);
 306       g_object_notify (G_OBJECT (interface_), "g-flags");
 307     }
 308   else
 309     {
 310       g_mutex_unlock (&interface_->priv->lock);
 311     }
 312 }
 313
 314 /**
 315  * g_dbus_interface_skeleton_get_info:
 316  * @interface_: A #GDBusInterfaceSkeleton.
 317  *
 318  * Gets D-Bus introspection information for the D-Bus interface
 319  * implemented by @interface_.
 320  *
 321  * Returns: (transfer none): A #GDBusInterfaceInfo (never %NULL). Do not free.
 322  *
 323  * Since: 2.30
 324  */
 325 GDBusInterfaceInfo *
 326 g_dbus_interface_skeleton_get_info (GDBusInterfaceSkeleton *interface_)
 327 {
 328   GDBusInterfaceInfo *ret;
 329   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 330   ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_info (interface_);
 331   g_warn_if_fail (ret != NULL);
 332   return ret;
 333 }
 334
 335 /**
 336  * g_dbus_interface_skeleton_get_vtable: (skip)
 337  * @interface_: A #GDBusInterfaceSkeleton.
 338  *
 339  * Gets the interface vtable for the D-Bus interface implemented by
 340  * @interface_. The returned function pointers should expect @interface_
 341  * itself to be passed as @user_data.
 342  *
 343  * Returns: A #GDBusInterfaceVTable (never %NULL).
 344  *
 345  * Since: 2.30
 346  */
 347 GDBusInterfaceVTable *
 348 g_dbus_interface_skeleton_get_vtable (GDBusInterfaceSkeleton *interface_)
 349 {
 350   GDBusInterfaceVTable *ret;
 351   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 352   ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_vtable (interface_);
 353   g_warn_if_fail (ret != NULL);
 354   return ret;
 355 }
 356
 357 /**
 358  * g_dbus_interface_skeleton_get_properties:
 359  * @interface_: A #GDBusInterfaceSkeleton.
 360  *
 361  * Gets all D-Bus properties for @interface_.
 362  *
 363  * Returns: (transfer full): A #GVariant of type <link linkend="G-VARIANT-TYPE-VARDICT:CAPS">'a{sv}'</link>. Free with g_variant_unref().
 364  *
 365  * Since: 2.30
 366  */
 367 GVariant *
 368 g_dbus_interface_skeleton_get_properties (GDBusInterfaceSkeleton *interface_)
 369 {
 370   GVariant *ret;
 371   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 372   ret = G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->get_properties (interface_);
 373   return g_variant_take_ref (ret);
 374 }
 375
 376 /**
 377  * g_dbus_interface_skeleton_flush:
 378  * @interface_: A #GDBusInterfaceSkeleton.
 379  *
 380  * If @interface_ has outstanding changes, request for these changes to be
 381  * emitted immediately.
 382  *
 383  * For example, an exported D-Bus interface may queue up property
 384  * changes and emit the
 385  * <literal>org.freedesktop.DBus.Properties::PropertiesChanged</literal>
 386  * signal later (e.g. in an idle handler). This technique is useful
 387  * for collapsing multiple property changes into one.
 388  *
 389  * Since: 2.30
 390  */
 391 void
 392 g_dbus_interface_skeleton_flush (GDBusInterfaceSkeleton *interface_)
 393 {
 394   g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
 395   G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface_)->flush (interface_);
 396 }
 397
 398 /* ---------------------------------------------------------------------------------------------------- */
 399
 400 static GDBusInterfaceInfo *
 401 _g_dbus_interface_skeleton_get_info (GDBusInterface *interface_)
 402 {
 403   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
 404   return g_dbus_interface_skeleton_get_info (interface);
 405 }
 406
 407 static GDBusObject *
 408 g_dbus_interface_skeleton_get_object (GDBusInterface *interface_)
 409 {
 410   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
 411   GDBusObject *ret;
 412   g_mutex_lock (&interface->priv->lock);
 413   ret = interface->priv->object;
 414   g_mutex_unlock (&interface->priv->lock);
 415   return ret;
 416 }
 417
 418 static GDBusObject *
 419 g_dbus_interface_skeleton_dup_object (GDBusInterface *interface_)
 420 {
 421   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
 422   GDBusObject *ret;
 423   g_mutex_lock (&interface->priv->lock);
 424   ret = interface->priv->object;
 425   if (ret != NULL)
 426     g_object_ref (ret);
 427   g_mutex_unlock (&interface->priv->lock);
 428   return ret;
 429 }
 430
 431 static void
 432 g_dbus_interface_skeleton_set_object (GDBusInterface *interface_,
 433                                       GDBusObject    *object)
 434 {
 435   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (interface_);
 436   g_mutex_lock (&interface->priv->lock);
 437   if (interface->priv->object != NULL)
 438     g_object_remove_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
 439   interface->priv->object = object;
 440   if (object != NULL)
 441     g_object_add_weak_pointer (G_OBJECT (interface->priv->object), (gpointer *) &interface->priv->object);
 442   g_mutex_unlock (&interface->priv->lock);
 443 }
 444
 445 static void
 446 dbus_interface_interface_init (GDBusInterfaceIface *iface)
 447 {
 448   iface->get_info    = _g_dbus_interface_skeleton_get_info;
 449   iface->get_object  = g_dbus_interface_skeleton_get_object;
 450   iface->dup_object  = g_dbus_interface_skeleton_dup_object;
 451   iface->set_object  = g_dbus_interface_skeleton_set_object;
 452 }
 453
 454 /* ---------------------------------------------------------------------------------------------------- */
 455
 456 typedef struct
 457 {
 458   volatile gint ref_count;
 459   GDBusInterfaceSkeleton       *interface;
 460   GDBusInterfaceMethodCallFunc  method_call_func;
 461   GDBusMethodInvocation        *invocation;
 462   GMainContext                 *context;
 463 } DispatchData;
 464
 465 static void
 466 dispatch_data_unref (DispatchData *data)
 467 {
 468   if (g_atomic_int_dec_and_test (&data->ref_count))
 469     {
 470       g_main_context_unref (data->context);
 471       g_free (data);
 472     }
 473 }
 474
 475 static DispatchData *
 476 dispatch_data_ref (DispatchData *data)
 477 {
 478   g_atomic_int_inc (&data->ref_count);
 479   return data;
 480 }
 481
 482 static gboolean
 483 dispatch_invoke_in_context_func (gpointer user_data)
 484 {
 485   DispatchData *data = user_data;
 486   data->method_call_func (g_dbus_method_invocation_get_connection (data->invocation),
 487                           g_dbus_method_invocation_get_sender (data->invocation),
 488                           g_dbus_method_invocation_get_object_path (data->invocation),
 489                           g_dbus_method_invocation_get_interface_name (data->invocation),
 490                           g_dbus_method_invocation_get_method_name (data->invocation),
 491                           g_dbus_method_invocation_get_parameters (data->invocation),
 492                           data->invocation,
 493                           g_dbus_method_invocation_get_user_data (data->invocation));
 494   return FALSE;
 495 }
 496
 497 static gboolean
 498 dispatch_in_thread_func (GIOSchedulerJob *job,
 499                          GCancellable    *cancellable,
 500                          gpointer         user_data)
 501 {
 502   DispatchData *data = user_data;
 503   GDBusInterfaceSkeletonFlags flags;
 504   GDBusObject *object;
 505   gboolean authorized;
 506
 507   g_mutex_lock (&data->interface->priv->lock);
 508   flags = data->interface->priv->flags;
 509   object = data->interface->priv->object;
 510   if (object != NULL)
 511     g_object_ref (object);
 512   g_mutex_unlock (&data->interface->priv->lock);
 513
 514   /* first check on the enclosing object (if any), then the interface */
 515   authorized = TRUE;
 516   if (object != NULL)
 517     {
 518       g_signal_emit_by_name (object,
 519                              "authorize-method",
 520                              data->interface,
 521                              data->invocation,
 522                              &authorized);
 523     }
 524   if (authorized)
 525     {
 526       g_signal_emit (data->interface,
 527                      signals[G_AUTHORIZE_METHOD_SIGNAL],
 528                      0,
 529                      data->invocation,
 530                      &authorized);
 531     }
 532
 533   if (authorized)
 534     {
 535       gboolean run_in_thread;
 536       run_in_thread = (flags & G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
 537       if (run_in_thread)
 538         {
 539           /* might as well just re-use the existing thread */
 540           data->method_call_func (g_dbus_method_invocation_get_connection (data->invocation),
 541                                   g_dbus_method_invocation_get_sender (data->invocation),
 542                                   g_dbus_method_invocation_get_object_path (data->invocation),
 543                                   g_dbus_method_invocation_get_interface_name (data->invocation),
 544                                   g_dbus_method_invocation_get_method_name (data->invocation),
 545                                   g_dbus_method_invocation_get_parameters (data->invocation),
 546                                   data->invocation,
 547                                   g_dbus_method_invocation_get_user_data (data->invocation));
 548         }
 549       else
 550         {
 551           /* bah, back to original context */
 552           g_main_context_invoke_full (data->context,
 553                                       G_PRIORITY_DEFAULT,
 554                                       dispatch_invoke_in_context_func,
 555                                       dispatch_data_ref (data),
 556                                       (GDestroyNotify) dispatch_data_unref);
 557         }
 558     }
 559   else
 560     {
 561       /* do nothing */
 562     }
 563
 564   if (object != NULL)
 565     g_object_unref (object);
 566
 567   return FALSE;
 568 }
 569
 570 static void
 571 g_dbus_interface_method_dispatch_helper (GDBusInterfaceSkeleton       *interface,
 572                                          GDBusInterfaceMethodCallFunc  method_call_func,
 573                                          GDBusMethodInvocation        *invocation)
 574 {
 575   gboolean has_handlers;
 576   gboolean has_default_class_handler;
 577   gboolean emit_authorized_signal;
 578   gboolean run_in_thread;
 579   GDBusInterfaceSkeletonFlags flags;
 580   GDBusObject *object;
 581
 582   g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface));
 583   g_return_if_fail (method_call_func != NULL);
 584   g_return_if_fail (G_IS_DBUS_METHOD_INVOCATION (invocation));
 585
 586   g_mutex_lock (&interface->priv->lock);
 587   flags = interface->priv->flags;
 588   object = interface->priv->object;
 589   if (object != NULL)
 590     g_object_ref (object);
 591   g_mutex_unlock (&interface->priv->lock);
 592
 593   /* optimization for the common case where
 594    *
 595    *  a) no handler is connected and class handler is not overridden (both interface and object); and
 596    *  b) method calls are not dispatched in a thread
 597    */
 598   has_handlers = g_signal_has_handler_pending (interface,
 599                                                signals[G_AUTHORIZE_METHOD_SIGNAL],
 600                                                0,
 601                                                TRUE);
 602   has_default_class_handler = (G_DBUS_INTERFACE_SKELETON_GET_CLASS (interface)->g_authorize_method ==
 603                                g_dbus_interface_skeleton_g_authorize_method_default);
 604
 605   emit_authorized_signal = (has_handlers || !has_default_class_handler);
 606   if (!emit_authorized_signal)
 607     {
 608       if (object != NULL)
 609         emit_authorized_signal = _g_dbus_object_skeleton_has_authorize_method_handlers (G_DBUS_OBJECT_SKELETON (object));
 610     }
 611
 612   run_in_thread = (flags & G_DBUS_INTERFACE_SKELETON_FLAGS_HANDLE_METHOD_INVOCATIONS_IN_THREAD);
 613   if (!emit_authorized_signal && !run_in_thread)
 614     {
 615       method_call_func (g_dbus_method_invocation_get_connection (invocation),
 616                         g_dbus_method_invocation_get_sender (invocation),
 617                         g_dbus_method_invocation_get_object_path (invocation),
 618                         g_dbus_method_invocation_get_interface_name (invocation),
 619                         g_dbus_method_invocation_get_method_name (invocation),
 620                         g_dbus_method_invocation_get_parameters (invocation),
 621                         invocation,
 622                         g_dbus_method_invocation_get_user_data (invocation));
 623     }
 624   else
 625     {
 626       DispatchData *data;
 627       data = g_new0 (DispatchData, 1);
 628       data->interface = interface;
 629       data->method_call_func = method_call_func;
 630       data->invocation = invocation;
 631       data->context = g_main_context_ref_thread_default ();
 632       data->ref_count = 1;
 633       g_io_scheduler_push_job (dispatch_in_thread_func,
 634                                data,
 635                                (GDestroyNotify) dispatch_data_unref,
 636                                G_PRIORITY_DEFAULT,
 637                                NULL); /* GCancellable* */
 638     }
 639
 640   if (object != NULL)
 641     g_object_unref (object);
 642 }
 643
 644 static void
 645 skeleton_intercept_handle_method_call (GDBusConnection       *connection,
 646                                        const gchar           *sender,
 647                                        const gchar           *object_path,
 648                                        const gchar           *interface_name,
 649                                        const gchar           *method_name,
 650                                        GVariant              *parameters,
 651                                        GDBusMethodInvocation *invocation,
 652                                        gpointer               user_data)
 653 {
 654   GDBusInterfaceSkeleton *interface = G_DBUS_INTERFACE_SKELETON (user_data);
 655   g_dbus_interface_method_dispatch_helper (interface,
 656                                            g_dbus_interface_skeleton_get_vtable (interface)->method_call,
 657                                            invocation);
 658 }
 659
 660 /* ---------------------------------------------------------------------------------------------------- */
 661
 662 static ConnectionData *
 663 new_connection (GDBusConnection *connection,
 664                 guint            registration_id)
 665 {
 666   ConnectionData *data;
 667
 668   data = g_slice_new0 (ConnectionData);
 669   data->connection      = g_object_ref (connection);
 670   data->registration_id = registration_id;
 671
 672   return data;
 673 }
 674
 675 static void
 676 free_connection (ConnectionData *data)
 677 {
 678   if (data != NULL)
 679     {
 680       g_object_unref (data->connection);
 681       g_slice_free (ConnectionData, data);
 682     }
 683 }
 684
 685 static gboolean
 686 add_connection_locked (GDBusInterfaceSkeleton *interface_,
 687                        GDBusConnection        *connection,
 688                        GError                **error)
 689 {
 690   ConnectionData *data;
 691   guint registration_id;
 692   gboolean ret = FALSE;
 693
 694   if (interface_->priv->hooked_vtable == NULL)
 695     {
 696       /* Hook the vtable since we need to intercept method calls for
 697        * ::g-authorize-method and for dispatching in thread vs
 698        * context
 699        *
 700        * We need to wait until subclasses have had time to initialize
 701        * properly before building the hooked_vtable, so we create it
 702        * once at the last minute.
 703        */
 704       interface_->priv->hooked_vtable = g_memdup (g_dbus_interface_skeleton_get_vtable (interface_), sizeof (GDBusInterfaceVTable));
 705       interface_->priv->hooked_vtable->method_call = skeleton_intercept_handle_method_call;
 706     }
 707
 708   registration_id = g_dbus_connection_register_object (connection,
 709                                                        interface_->priv->object_path,
 710                                                        g_dbus_interface_skeleton_get_info (interface_),
 711                                                        interface_->priv->hooked_vtable,
 712                                                        interface_,
 713                                                        NULL, /* user_data_free_func */
 714                                                        error);
 715
 716   if (registration_id > 0)
 717     {
 718       data = new_connection (connection, registration_id);
 719       interface_->priv->connections = g_slist_append (interface_->priv->connections, data);
 720       ret = TRUE;
 721     }
 722
 723   return ret;
 724 }
 725
 726 static void
 727 remove_connection_locked (GDBusInterfaceSkeleton *interface_,
 728                           GDBusConnection        *connection)
 729 {
 730   ConnectionData *data;
 731   GSList *l;
 732
 733   /* Get the connection in the list and unregister ... */
 734   for (l = interface_->priv->connections; l != NULL; l = l->next)
 735     {
 736       data = l->data;
 737       if (data->connection == connection)
 738         {
 739           g_warn_if_fail (g_dbus_connection_unregister_object (data->connection, data->registration_id));
 740           free_connection (data);
 741           interface_->priv->connections = g_slist_delete_link (interface_->priv->connections, l);
 742           /* we are guaranteed that the connection is only added once, so bail out early */
 743           goto out;
 744         }
 745     }
 746  out:
 747   ;
 748 }
 749
 750 static void
 751 set_object_path_locked (GDBusInterfaceSkeleton *interface_,
 752                         const gchar            *object_path)
 753 {
 754   if (g_strcmp0 (interface_->priv->object_path, object_path) != 0)
 755     {
 756       g_free (interface_->priv->object_path);
 757       interface_->priv->object_path = g_strdup (object_path);
 758     }
 759 }
 760
 761 /* ---------------------------------------------------------------------------------------------------- */
 762
 763 /**
 764  * g_dbus_interface_skeleton_get_connection:
 765  * @interface_: A #GDBusInterfaceSkeleton.
 766  *
 767  * Gets the first connection that @interface_ is exported on, if any.
 768  *
 769  * Returns: (transfer none): A #GDBusConnection or %NULL if @interface_ is
 770  * not exported anywhere. Do not free, the object belongs to @interface_.
 771  *
 772  * Since: 2.30
 773  */
 774 GDBusConnection *
 775 g_dbus_interface_skeleton_get_connection (GDBusInterfaceSkeleton *interface_)
 776 {
 777   ConnectionData  *data;
 778   GDBusConnection *ret;
 779
 780   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 781   g_mutex_lock (&interface_->priv->lock);
 782
 783   ret = NULL;
 784   if (interface_->priv->connections != NULL)
 785     {
 786       data = interface_->priv->connections->data;
 787       if (data != NULL)
 788         ret = data->connection;
 789     }
 790
 791   g_mutex_unlock (&interface_->priv->lock);
 792
 793   return ret;
 794 }
 795
 796 /**
 797  * g_dbus_interface_skeleton_get_connections:
 798  * @interface_: A #GDBusInterfaceSkeleton.
 799  *
 800  * Gets a list of the connections that @interface_ is exported on.
 801  *
 802  * Returns: (element-type GDBusConnection) (transfer full): A list of
 803  *   all the connections that @interface_ is exported on. The returned
 804  *   list should be freed with g_list_free() after each element has
 805  *   been freed with g_object_unref().
 806  *
 807  * Since: 2.32
 808  */
 809 GList *
 810 g_dbus_interface_skeleton_get_connections (GDBusInterfaceSkeleton *interface_)
 811 {
 812   GList           *connections;
 813   GSList          *l;
 814   ConnectionData  *data;
 815
 816   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 817
 818   g_mutex_lock (&interface_->priv->lock);
 819   connections = NULL;
 820
 821   for (l = interface_->priv->connections; l != NULL; l = l->next)
 822     {
 823       data        = l->data;
 824       connections = g_list_prepend (connections,
 825                                     /* Return a reference to each connection */
 826                                     g_object_ref (data->connection));
 827     }
 828
 829   g_mutex_unlock (&interface_->priv->lock);
 830
 831   return g_list_reverse (connections);
 832 }
 833
 834 /**
 835  * g_dbus_interface_skeleton_has_connection:
 836  * @interface_: A #GDBusInterfaceSkeleton.
 837  * @connection: A #GDBusConnection.
 838  *
 839  * Checks if @interface_ is export on @connection.
 840  *
 841  * Returns: %TRUE if @interface_ is exported on @connection, %FALSE otherwise.
 842  *
 843  * Since: 2.32
 844  */
 845 gboolean
 846 g_dbus_interface_skeleton_has_connection (GDBusInterfaceSkeleton     *interface_,
 847                                           GDBusConnection            *connection)
 848 {
 849   GSList *l;
 850   gboolean ret = FALSE;
 851
 852   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), FALSE);
 853   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
 854
 855   g_mutex_lock (&interface_->priv->lock);
 856
 857   for (l = interface_->priv->connections; l != NULL; l = l->next)
 858     {
 859       ConnectionData *data = l->data;
 860       if (data->connection == connection)
 861         {
 862           ret = TRUE;
 863           goto out;
 864         }
 865     }
 866
 867  out:
 868   g_mutex_unlock (&interface_->priv->lock);
 869   return ret;
 870 }
 871
 872 /**
 873  * g_dbus_interface_skeleton_get_object_path:
 874  * @interface_: A #GDBusInterfaceSkeleton.
 875  *
 876  * Gets the object path that @interface_ is exported on, if any.
 877  *
 878  * Returns: A string owned by @interface_ or %NULL if @interface_ is not exported
 879  * anywhere. Do not free, the string belongs to @interface_.
 880  *
 881  * Since: 2.30
 882  */
 883 const gchar *
 884 g_dbus_interface_skeleton_get_object_path (GDBusInterfaceSkeleton *interface_)
 885 {
 886   const gchar *ret;
 887   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), NULL);
 888   g_mutex_lock (&interface_->priv->lock);
 889   ret = interface_->priv->object_path;
 890   g_mutex_unlock (&interface_->priv->lock);
 891   return ret;
 892 }
 893
 894 /**
 895  * g_dbus_interface_skeleton_export:
 896  * @interface_: The D-Bus interface to export.
 897  * @connection: A #GDBusConnection to export @interface_ on.
 898  * @object_path: The path to export the interface at.
 899  * @error: Return location for error or %NULL.
 900  *
 901  * Exports @interface_ at @object_path on @connection.
 902  *
 903  * This can be called multiple times to export the same @interface_
 904  * onto multiple connections however the @object_path provided must be
 905  * the same for all connections.
 906  *
 907  * Use g_dbus_interface_skeleton_unexport() to unexport the object.
 908  *
 909  * Returns: %TRUE if the interface was exported on @connection, otherwise %FALSE with
 910  * @error set.
 911  *
 912  * Since: 2.30
 913  */
 914 gboolean
 915 g_dbus_interface_skeleton_export (GDBusInterfaceSkeleton  *interface_,
 916                                   GDBusConnection         *connection,
 917                                   const gchar             *object_path,
 918                                   GError                 **error)
 919 {
 920   gboolean ret = FALSE;
 921
 922   g_return_val_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_), FALSE);
 923   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
 924   g_return_val_if_fail (g_variant_is_object_path (object_path), FALSE);
 925   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
 926
 927   /* Assert that the object path is the same for multiple connections here */
 928   g_return_val_if_fail (interface_->priv->object_path == NULL ||
 929                         g_strcmp0 (interface_->priv->object_path, object_path) == 0, FALSE);
 930
 931   g_mutex_lock (&interface_->priv->lock);
 932
 933   /* Set the object path */
 934   set_object_path_locked (interface_, object_path);
 935
 936   /* Add the connection */
 937   ret = add_connection_locked (interface_, connection, error);
 938
 939   g_mutex_unlock (&interface_->priv->lock);
 940   return ret;
 941 }
 942
 943 /**
 944  * g_dbus_interface_skeleton_unexport:
 945  * @interface_: A #GDBusInterfaceSkeleton.
 946  *
 947  * Stops exporting @interface_ on all connections it is exported on.
 948  *
 949  * To unexport @interface_ from only a single connection, use
 950  * g_dbus_interface_skeleton_unexport_from_connection()
 951  *
 952  * Since: 2.30
 953  */
 954 void
 955 g_dbus_interface_skeleton_unexport (GDBusInterfaceSkeleton *interface_)
 956 {
 957   g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
 958   g_return_if_fail (interface_->priv->connections != NULL);
 959
 960   g_mutex_lock (&interface_->priv->lock);
 961
 962   g_assert (interface_->priv->object_path != NULL);
 963   g_assert (interface_->priv->hooked_vtable != NULL);
 964
 965   /* Remove all connections */
 966   while (interface_->priv->connections != NULL)
 967     {
 968       ConnectionData *data = interface_->priv->connections->data;
 969       remove_connection_locked (interface_, data->connection);
 970     }
 971
 972   /* Unset the object path since there are no connections left */
 973   set_object_path_locked (interface_, NULL);
 974
 975   g_mutex_unlock (&interface_->priv->lock);
 976 }
 977
 978
 979 /**
 980  * g_dbus_interface_skeleton_unexport_from_connection:
 981  * @interface_: A #GDBusInterfaceSkeleton.
 982  * @connection: A #GDBusConnection.
 983  *
 984  * Stops exporting @interface_ on @connection.
 985  *
 986  * To stop exporting on all connections the interface is exported on,
 987  * use g_dbus_interface_skeleton_unexport().
 988  *
 989  * Since: 2.32
 990  */
 991 void
 992 g_dbus_interface_skeleton_unexport_from_connection (GDBusInterfaceSkeleton *interface_,
 993                                                     GDBusConnection        *connection)
 994 {
 995   g_return_if_fail (G_IS_DBUS_INTERFACE_SKELETON (interface_));
 996   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
 997   g_return_if_fail (interface_->priv->connections != NULL);
 998
 999   g_mutex_lock (&interface_->priv->lock);
1000
1001   g_assert (interface_->priv->object_path != NULL);
1002   g_assert (interface_->priv->hooked_vtable != NULL);
1003
1004   remove_connection_locked (interface_, connection);
1005
1006   /* Reset the object path if we removed the last connection */
1007   if (interface_->priv->connections == NULL)
1008     set_object_path_locked (interface_, NULL);
1009
1010   g_mutex_unlock (&interface_->priv->lock);
1011 }
1012
1013 /* ---------------------------------------------------------------------------------------------------- */