gio/gdbusconnection.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 /*
  24  * TODO for GDBus:
  25  *
  26  * - Validate all data (e.g. UTF-8) and check all the required D-Bus headers
  27  *   are present and forbidden ones aren't
  28  *   - When writing: g_dbus_message_to_blob()
  29  *   - When reading: g_dbus_message_new_from_blob()
  30  *
  31  * - would be nice to expose GDBusAuthMechanism and an extension point
  32  *
  33  * - Need to rewrite GDBusAuth and rework GDBusAuthMechanism. In particular
  34  *   the mechanism VFuncs need to be able to set an error.
  35  *
  36  * - Need to document other mechanisms/sources for determining the D-Bus
  37  *   address of a well-known bus.
  38  *
  39  *   - e.g. on Win32 we need code like from here
  40  *
  41  *     http://cgit.freedesktop.org/~david/gdbus-standalone/tree/gdbus/gdbusaddress.c#n900
  42  *
  43  *     that was never copied over here because it originally was copy-paste
  44  *     from the GPLv2 / AFL 2.1 libdbus sources.
  45  *
  46  *   - on OS X we need to look in launchd for the address
  47  *
  48  *     https://bugs.freedesktop.org/show_bug.cgi?id=14259
  49  *
  50  *   - on X11 we need to look in a X11 property on the X server
  51  *     - (we can also just use dbus-launch(1) from the D-Bus
  52  *        distribution)
  53  *
  54  *   - (ideally) this requires D-Bus spec work because none of
  55  *     this has never really been specced out properly (excect
  56  *     the X11 bits)
  57  *
  58  * - Related to the above, we also need to be able to launch a message bus
  59  *   instance.... Since we don't want to write our own bus daemon we should
  60  *   launch dbus-daemon(1) (thus: Win32 and OS X need to bundle it)
  61  *
  62  * - probably want a G_DBUS_NONCE_TCP_TMPDIR environment variable
  63  *   to specify where the nonce is stored. This will allow people to use
  64  *   G_DBUS_NONCE_TCP_TMPDIR=/mnt/secure.company.server/dbus-nonce-dir
  65  *   to easily acheive secure RPC via nonce-tcp.
  66  *
  67  * - need to expose an extension point for resolving D-Bus address and
  68  *   turning them into GIOStream objects. This will allow us to implement
  69  *   e.g. X11 D-Bus transports without dlopen()'ing or linking against
  70  *   libX11 from libgio.
  71  *   - see g_dbus_address_connect() in gdbusaddress.c
  72  *
  73  * - would be cute to use kernel-specific APIs to resolve fds for
  74  *   debug output when using G_DBUS_DEBUG=messages, e.g. in addition to
  75  *
  76  *     fd 21: dev=8:1,mode=0100644,ino=1171231,uid=0,gid=0,rdev=0:0,size=234,atime=1273070640,mtime=1267126160,ctime=1267126160
  77  *
  78  *   maybe we can show more information about what fd 21 really is.
  79  *   Ryan suggests looking in /proc/self/fd for clues / symlinks!
  80  *   Initial experiments on Linux 2.6 suggests that the symlink looks
  81  *   like this:
  82  *
  83  *    3 -> /proc/18068/fd
  84  *
  85  *   e.g. not of much use.
  86  *
  87  *  - GDBus High-Level docs
  88  *    - Proxy: properties, signals...
  89  *    - Connection: IOStream based, ::close, connection setup steps
  90  *                  mainloop integration, threading
  91  *    - Differences from libdbus (extend "Migrating from")
  92  *      - the message handling thread
  93  *      - Using GVariant instead of GValue
  94  *    - Explain why the high-level API is a good thing and what
  95  *      kind of pitfalls it avoids
  96  *      - Export objects before claiming names
  97  *    - Talk about auto-starting services (cf. GBusNameWatcherFlags)
  98  *
  99  *  - Mention in all API that the GVariant is sunk. Also mention
 100  *    when the returned GVariant is floating.
 101  *
 102  *  - Consistent timeout handling (25s vs 30s?)
 103  *
 104  *  - GDBusProxy subclass example
 105  *
 106  *  - Update GDBusAuthObserver (is_same_user(), s/deny/authorize/)
 107  */
 108
 109 #include "config.h"
 110
 111 #include <stdlib.h>
 112 #include <string.h>
 113
 114 #include "gdbusauth.h"
 115 #include "gdbusutils.h"
 116 #include "gdbusaddress.h"
 117 #include "gdbusmessage.h"
 118 #include "gdbusconnection.h"
 119 #include "gdbuserror.h"
 120 #include "gioenumtypes.h"
 121 #include "gdbusintrospection.h"
 122 #include "gdbusmethodinvocation.h"
 123 #include "gdbusprivate.h"
 124 #include "gdbusauthobserver.h"
 125 #include "gio-marshal.h"
 126 #include "ginitable.h"
 127 #include "gasyncinitable.h"
 128 #include "giostream.h"
 129 #include "gasyncresult.h"
 130 #include "gsimpleasyncresult.h"
 131
 132 #ifdef G_OS_UNIX
 133 #include <gio/gunixconnection.h>
 134 #include <gio/gunixfdmessage.h>
 135 #include <unistd.h>
 136 #include <sys/types.h>
 137 #endif
 138
 139 #include "glibintl.h"
 140 #include "gioalias.h"
 141
 142 /**
 143  * SECTION:gdbusconnection
 144  * @short_description: D-Bus Connections
 145  * @include: gio/gio.h
 146  *
 147  * The #GDBusConnection type is used for D-Bus connections to remote
 148  * peers such as a message buses. It is a low-level API that offers a
 149  * lot of flexibility. For instance, it lets you establish a connection
 150  * over any transport that can by represented as an #GIOStream.
 151  *
 152  * This class is rarely used directly in D-Bus clients. If you are writing
 153  * an D-Bus client, it is often easier to use the g_bus_own_name(),
 154  * g_bus_watch_name() or g_bus_watch_proxy() APIs.
 155  *
 156  * <example id="gdbus-server"><title>D-Bus server example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-server.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
 157  *
 158  * <example id="gdbus-subtree-server"><title>D-Bus subtree example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-subtree.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
 159  *
 160  * <example id="gdbus-unix-fd-client"><title>D-Bus UNIX File Descriptor example</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-unix-fd-client.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
 161  */
 162
 163 /* ---------------------------------------------------------------------------------------------------- */
 164
 165 G_LOCK_DEFINE_STATIC (message_bus_lock);
 166
 167 static GDBusConnection *the_session_bus = NULL;
 168 static GDBusConnection *the_system_bus = NULL;
 169
 170 /* ---------------------------------------------------------------------------------------------------- */
 171
 172 static gboolean
 173 _g_strv_has_string (const gchar* const *haystack,
 174                     const gchar        *needle)
 175 {
 176   guint n;
 177
 178   for (n = 0; haystack != NULL && haystack[n] != NULL; n++)
 179     {
 180       if (g_strcmp0 (haystack[n], needle) == 0)
 181         return TRUE;
 182     }
 183   return FALSE;
 184 }
 185
 186 /* ---------------------------------------------------------------------------------------------------- */
 187
 188 #ifdef G_OS_WIN32
 189 #define CONNECTION_ENSURE_LOCK(obj) do { ; } while (FALSE)
 190 #else
 191 // TODO: for some reason this doesn't work on Windows
 192 #define CONNECTION_ENSURE_LOCK(obj) do {                                \
 193     if (G_UNLIKELY (g_mutex_trylock((obj)->priv->lock)))                \
 194       {                                                                 \
 195         g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
 196                              "CONNECTION_ENSURE_LOCK: GDBusConnection object lock is not locked"); \
 197       }                                                                 \
 198   } while (FALSE)
 199 #endif
 200
 201 #define CONNECTION_LOCK(obj) do {                                       \
 202     g_mutex_lock ((obj)->priv->lock);                                   \
 203   } while (FALSE)
 204
 205 #define CONNECTION_UNLOCK(obj) do {                                     \
 206     g_mutex_unlock ((obj)->priv->lock);                                 \
 207   } while (FALSE)
 208
 209 struct _GDBusConnectionPrivate
 210 {
 211   /* ------------------------------------------------------------------------ */
 212   /* -- General object state ------------------------------------------------ */
 213   /* ------------------------------------------------------------------------ */
 214
 215   /* object-wide lock */
 216   GMutex *lock;
 217
 218   /* A lock used in the init() method of the GInitable interface - see comments
 219    * in initable_init() for why a separate lock is needed
 220    */
 221   GMutex *init_lock;
 222
 223   /* Set (by loading the contents of /var/lib/dbus/machine-id) the first time
 224    * someone calls org.freedesktop.DBus.GetMachineId()
 225    */
 226   gchar *machine_id;
 227
 228   /* The underlying stream used for communication */
 229   GIOStream *stream;
 230
 231   /* The object used for authentication (if any) */
 232   GDBusAuth *auth;
 233
 234   /* Set to TRUE if the connection has been closed */
 235   gboolean closed;
 236
 237   /* Last serial used */
 238   guint32 last_serial;
 239
 240   /* The object used to send/receive message */
 241   GDBusWorker *worker;
 242
 243   /* If connected to a message bus, this contains the unique name assigned to
 244    * us by the bus (e.g. ":1.42")
 245    */
 246   gchar *bus_unique_name;
 247
 248   /* The GUID returned by the other side if we authenticed as a client or
 249    * the GUID to use if authenticating as a server
 250    */
 251   gchar *guid;
 252
 253   /* set to TRUE exactly when initable_init() has finished running */
 254   gboolean is_initialized;
 255
 256   /* If the connection could not be established during initable_init(), this GError will set */
 257   GError *initialization_error;
 258
 259   /* The result of g_main_context_get_thread_default() when the object
 260    * was created (the GObject _init() function) - this is used for delivery
 261    * of the :closed GObject signal.
 262    */
 263   GMainContext *main_context_at_construction;
 264
 265   /* construct properties */
 266   gchar *address;
 267   GDBusConnectionFlags flags;
 268
 269   /* Map used for managing method replies */
 270   GHashTable *map_method_serial_to_send_message_data;  /* guint32 -> SendMessageData* */
 271
 272   /* Maps used for managing signal subscription */
 273   GHashTable *map_rule_to_signal_data;          /* gchar* -> SignalData */
 274   GHashTable *map_id_to_signal_data;            /* guint  -> SignalData */
 275   GHashTable *map_sender_to_signal_data_array;  /* gchar* -> GPtrArray* of SignalData */
 276
 277   /* Maps used for managing exported objects and subtrees */
 278   GHashTable *map_object_path_to_eo;  /* gchar* -> ExportedObject* */
 279   GHashTable *map_id_to_ei;           /* guint  -> ExportedInterface* */
 280   GHashTable *map_object_path_to_es;  /* gchar* -> ExportedSubtree* */
 281   GHashTable *map_id_to_es;           /* guint  -> ExportedSubtree* */
 282
 283   /* Structure used for message filters */
 284   GPtrArray *filters;
 285
 286   /* Whether to exit on close */
 287   gboolean exit_on_close;
 288
 289   /* Capabilities negotiated during authentication */
 290   GDBusCapabilityFlags capabilities;
 291
 292   GDBusAuthObserver *authentication_observer;
 293   GCredentials *crendentials;
 294 };
 295
 296 typedef struct ExportedObject ExportedObject;
 297 static void exported_object_free (ExportedObject *eo);
 298
 299 typedef struct ExportedSubtree ExportedSubtree;
 300 static void exported_subtree_free (ExportedSubtree *es);
 301
 302 enum
 303 {
 304   CLOSED_SIGNAL,
 305   LAST_SIGNAL,
 306 };
 307
 308 enum
 309 {
 310   PROP_0,
 311   PROP_STREAM,
 312   PROP_ADDRESS,
 313   PROP_FLAGS,
 314   PROP_GUID,
 315   PROP_UNIQUE_NAME,
 316   PROP_CLOSED,
 317   PROP_EXIT_ON_CLOSE,
 318   PROP_CAPABILITY_FLAGS,
 319   PROP_AUTHENTICATION_OBSERVER,
 320 };
 321
 322 static void distribute_signals (GDBusConnection  *connection,
 323                                 GDBusMessage     *message);
 324
 325 static void distribute_method_call (GDBusConnection  *connection,
 326                                     GDBusMessage     *message);
 327
 328 static gboolean handle_generic_unlocked (GDBusConnection *connection,
 329                                          GDBusMessage    *message);
 330
 331
 332 static void purge_all_signal_subscriptions (GDBusConnection *connection);
 333 static void purge_all_filters (GDBusConnection *connection);
 334
 335 #define _G_ENSURE_LOCK(name) do {                                       \
 336     if (G_UNLIKELY (G_TRYLOCK(name)))                                   \
 337       {                                                                 \
 338         g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
 339                              "_G_ENSURE_LOCK: Lock `" #name "' is not locked"); \
 340       }                                                                 \
 341   } while (FALSE)                                                       \
 342
 343 static guint signals[LAST_SIGNAL] = { 0 };
 344
 345 static void initable_iface_init       (GInitableIface      *initable_iface);
 346 static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface);
 347
 348 G_DEFINE_TYPE_WITH_CODE (GDBusConnection, g_dbus_connection, G_TYPE_OBJECT,
 349                          G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
 350                          G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init)
 351                          );
 352
 353 static void
 354 g_dbus_connection_dispose (GObject *object)
 355 {
 356   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 357
 358   G_LOCK (message_bus_lock);
 359   //g_debug ("disposing %p", connection);
 360   if (connection == the_session_bus)
 361     {
 362       the_session_bus = NULL;
 363     }
 364   else if (connection == the_system_bus)
 365     {
 366       the_system_bus = NULL;
 367     }
 368   if (connection->priv->worker != NULL)
 369     {
 370       _g_dbus_worker_stop (connection->priv->worker);
 371       connection->priv->worker = NULL;
 372     }
 373   G_UNLOCK (message_bus_lock);
 374
 375   if (G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose != NULL)
 376     G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose (object);
 377 }
 378
 379 static void
 380 g_dbus_connection_finalize (GObject *object)
 381 {
 382   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 383
 384   if (connection->priv->authentication_observer != NULL)
 385     g_object_unref (connection->priv->authentication_observer);
 386
 387   if (connection->priv->auth != NULL)
 388     g_object_unref (connection->priv->auth);
 389
 390   //g_debug ("finalizing %p", connection);
 391   if (connection->priv->stream != NULL)
 392     {
 393       /* We don't really care if closing the stream succeeds or not */
 394       g_io_stream_close_async (connection->priv->stream,
 395                                G_PRIORITY_DEFAULT,
 396                                NULL,  /* GCancellable */
 397                                NULL,  /* GAsyncReadyCallback */
 398                                NULL); /* userdata */
 399       g_object_unref (connection->priv->stream);
 400       connection->priv->stream = NULL;
 401     }
 402
 403   g_free (connection->priv->address);
 404
 405   g_free (connection->priv->guid);
 406   g_free (connection->priv->bus_unique_name);
 407
 408   if (connection->priv->initialization_error != NULL)
 409     g_error_free (connection->priv->initialization_error);
 410
 411   g_hash_table_unref (connection->priv->map_method_serial_to_send_message_data);
 412
 413   purge_all_signal_subscriptions (connection);
 414   g_hash_table_unref (connection->priv->map_rule_to_signal_data);
 415   g_hash_table_unref (connection->priv->map_id_to_signal_data);
 416   g_hash_table_unref (connection->priv->map_sender_to_signal_data_array);
 417
 418   g_hash_table_unref (connection->priv->map_id_to_ei);
 419   g_hash_table_unref (connection->priv->map_object_path_to_eo);
 420   g_hash_table_unref (connection->priv->map_id_to_es);
 421   g_hash_table_unref (connection->priv->map_object_path_to_es);
 422
 423   purge_all_filters (connection);
 424   g_ptr_array_unref (connection->priv->filters);
 425
 426   if (connection->priv->main_context_at_construction != NULL)
 427     g_main_context_unref (connection->priv->main_context_at_construction);
 428
 429   g_free (connection->priv->machine_id);
 430
 431   g_mutex_free (connection->priv->init_lock);
 432   g_mutex_free (connection->priv->lock);
 433
 434   G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize (object);
 435 }
 436
 437 static void
 438 g_dbus_connection_get_property (GObject    *object,
 439                                 guint       prop_id,
 440                                 GValue     *value,
 441                                 GParamSpec *pspec)
 442 {
 443   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 444
 445   switch (prop_id)
 446     {
 447     case PROP_STREAM:
 448       g_value_set_object (value, g_dbus_connection_get_stream (connection));
 449       break;
 450
 451     case PROP_GUID:
 452       g_value_set_string (value, g_dbus_connection_get_guid (connection));
 453       break;
 454
 455     case PROP_UNIQUE_NAME:
 456       g_value_set_string (value, g_dbus_connection_get_unique_name (connection));
 457       break;
 458
 459     case PROP_CLOSED:
 460       g_value_set_boolean (value, g_dbus_connection_is_closed (connection));
 461       break;
 462
 463     case PROP_EXIT_ON_CLOSE:
 464       g_value_set_boolean (value, g_dbus_connection_get_exit_on_close (connection));
 465       break;
 466
 467     case PROP_CAPABILITY_FLAGS:
 468       g_value_set_flags (value, g_dbus_connection_get_capabilities (connection));
 469       break;
 470
 471     default:
 472       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 473       break;
 474     }
 475 }
 476
 477 static void
 478 g_dbus_connection_set_property (GObject      *object,
 479                                 guint         prop_id,
 480                                 const GValue *value,
 481                                 GParamSpec   *pspec)
 482 {
 483   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 484
 485   switch (prop_id)
 486     {
 487     case PROP_STREAM:
 488       connection->priv->stream = g_value_dup_object (value);
 489       break;
 490
 491     case PROP_GUID:
 492       connection->priv->guid = g_value_dup_string (value);
 493       break;
 494
 495     case PROP_ADDRESS:
 496       connection->priv->address = g_value_dup_string (value);
 497       break;
 498
 499     case PROP_FLAGS:
 500       connection->priv->flags = g_value_get_flags (value);
 501       break;
 502
 503     case PROP_EXIT_ON_CLOSE:
 504       g_dbus_connection_set_exit_on_close (connection, g_value_get_boolean (value));
 505       break;
 506
 507     case PROP_AUTHENTICATION_OBSERVER:
 508       connection->priv->authentication_observer = g_value_dup_object (value);
 509       break;
 510
 511     default:
 512       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 513       break;
 514     }
 515 }
 516
 517 static void
 518 g_dbus_connection_real_closed (GDBusConnection *connection,
 519                                gboolean         remote_peer_vanished,
 520                                GError          *error)
 521 {
 522   if (remote_peer_vanished && connection->priv->exit_on_close)
 523     {
 524       g_print ("%s: Remote peer vanished. Exiting.\n", G_STRFUNC);
 525       raise (SIGTERM);
 526     }
 527 }
 528
 529 static void
 530 g_dbus_connection_class_init (GDBusConnectionClass *klass)
 531 {
 532   GObjectClass *gobject_class;
 533
 534   g_type_class_add_private (klass, sizeof (GDBusConnectionPrivate));
 535
 536   gobject_class = G_OBJECT_CLASS (klass);
 537
 538   gobject_class->finalize     = g_dbus_connection_finalize;
 539   gobject_class->dispose      = g_dbus_connection_dispose;
 540   gobject_class->set_property = g_dbus_connection_set_property;
 541   gobject_class->get_property = g_dbus_connection_get_property;
 542
 543   klass->closed = g_dbus_connection_real_closed;
 544
 545   /**
 546    * GDBusConnection:stream:
 547    *
 548    * The underlying #GIOStream used for I/O.
 549    *
 550    * Since: 2.26
 551    */
 552   g_object_class_install_property (gobject_class,
 553                                    PROP_STREAM,
 554                                    g_param_spec_object ("stream",
 555                                                         P_("IO Stream"),
 556                                                         P_("The underlying streams used for I/O"),
 557                                                         G_TYPE_IO_STREAM,
 558                                                         G_PARAM_READABLE |
 559                                                         G_PARAM_WRITABLE |
 560                                                         G_PARAM_CONSTRUCT_ONLY |
 561                                                         G_PARAM_STATIC_NAME |
 562                                                         G_PARAM_STATIC_BLURB |
 563                                                         G_PARAM_STATIC_NICK));
 564
 565   /**
 566    * GDBusConnection:address:
 567    *
 568    * A D-Bus address specifying potential endpoints that can be used
 569    * when establishing the connection.
 570    *
 571    * Since: 2.26
 572    */
 573   g_object_class_install_property (gobject_class,
 574                                    PROP_ADDRESS,
 575                                    g_param_spec_string ("address",
 576                                                         P_("Address"),
 577                                                         P_("D-Bus address specifying potential socket endpoints"),
 578                                                         NULL,
 579                                                         G_PARAM_WRITABLE |
 580                                                         G_PARAM_CONSTRUCT_ONLY |
 581                                                         G_PARAM_STATIC_NAME |
 582                                                         G_PARAM_STATIC_BLURB |
 583                                                         G_PARAM_STATIC_NICK));
 584
 585   /**
 586    * GDBusConnection:flags:
 587    *
 588    * Flags from the #GDBusConnectionFlags enumeration.
 589    *
 590    * Since: 2.26
 591    */
 592   g_object_class_install_property (gobject_class,
 593                                    PROP_FLAGS,
 594                                    g_param_spec_flags ("flags",
 595                                                        P_("Flags"),
 596                                                        P_("Flags"),
 597                                                        G_TYPE_DBUS_CONNECTION_FLAGS,
 598                                                        G_DBUS_CONNECTION_FLAGS_NONE,
 599                                                        G_PARAM_WRITABLE |
 600                                                        G_PARAM_CONSTRUCT_ONLY |
 601                                                        G_PARAM_STATIC_NAME |
 602                                                        G_PARAM_STATIC_BLURB |
 603                                                        G_PARAM_STATIC_NICK));
 604
 605   /**
 606    * GDBusConnection:guid:
 607    *
 608    * The GUID of the peer performing the role of server when
 609    * authenticating.
 610    *
 611    * If you are constructing a #GDBusConnection and pass
 612    * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER in the
 613    * #GDBusConnection:flags property then you MUST also set this
 614    * property to a valid guid.
 615    *
 616    * If you are constructing a #GDBusConnection and pass
 617    * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT in the
 618    * #GDBusConnection:flags property you will be able to read the GUID
 619    * of the other peer here after the connection has been successfully
 620    * initialized.
 621    *
 622    * Since: 2.26
 623    */
 624   g_object_class_install_property (gobject_class,
 625                                    PROP_GUID,
 626                                    g_param_spec_string ("guid",
 627                                                         P_("GUID"),
 628                                                         P_("GUID of the server peer"),
 629                                                         NULL,
 630                                                         G_PARAM_READABLE |
 631                                                         G_PARAM_WRITABLE |
 632                                                         G_PARAM_CONSTRUCT_ONLY |
 633                                                         G_PARAM_STATIC_NAME |
 634                                                         G_PARAM_STATIC_BLURB |
 635                                                         G_PARAM_STATIC_NICK));
 636
 637   /**
 638    * GDBusConnection:unique-name:
 639    *
 640    * The unique name as assigned by the message bus or %NULL if the
 641    * connection is not open or not a message bus connection.
 642    *
 643    * Since: 2.26
 644    */
 645   g_object_class_install_property (gobject_class,
 646                                    PROP_UNIQUE_NAME,
 647                                    g_param_spec_string ("unique-name",
 648                                                         P_("unique-name"),
 649                                                         P_("Unique name of bus connection"),
 650                                                         NULL,
 651                                                         G_PARAM_READABLE |
 652                                                         G_PARAM_STATIC_NAME |
 653                                                         G_PARAM_STATIC_BLURB |
 654                                                         G_PARAM_STATIC_NICK));
 655
 656   /**
 657    * GDBusConnection:closed:
 658    *
 659    * A boolean specifying whether the connection has been closed.
 660    *
 661    * Since: 2.26
 662    */
 663   g_object_class_install_property (gobject_class,
 664                                    PROP_CLOSED,
 665                                    g_param_spec_boolean ("closed",
 666                                                          P_("Closed"),
 667                                                          P_("Whether the connection is closed"),
 668                                                          FALSE,
 669                                                          G_PARAM_READABLE |
 670                                                          G_PARAM_STATIC_NAME |
 671                                                          G_PARAM_STATIC_BLURB |
 672                                                          G_PARAM_STATIC_NICK));
 673
 674   /**
 675    * GDBusConnection:exit-on-close:
 676    *
 677    * A boolean specifying whether the process will be terminated (by
 678    * calling <literal>raise(SIGTERM)</literal>) if the connection
 679    * is closed by the remote peer.
 680    *
 681    * Since: 2.26
 682    */
 683   g_object_class_install_property (gobject_class,
 684                                    PROP_EXIT_ON_CLOSE,
 685                                    g_param_spec_boolean ("exit-on-close",
 686                                                          P_("Exit on close"),
 687                                                          P_("Whether the process is terminated when the connection is closed"),
 688                                                          FALSE,
 689                                                          G_PARAM_READABLE |
 690                                                          G_PARAM_WRITABLE |
 691                                                          G_PARAM_STATIC_NAME |
 692                                                          G_PARAM_STATIC_BLURB |
 693                                                          G_PARAM_STATIC_NICK));
 694
 695   /**
 696    * GDBusConnection:capabilities:
 697    *
 698    * Flags from the #GDBusCapabilityFlags enumeration
 699    * representing connection features negotiated with the other peer.
 700    *
 701    * Since: 2.26
 702    */
 703   g_object_class_install_property (gobject_class,
 704                                    PROP_CAPABILITY_FLAGS,
 705                                    g_param_spec_flags ("capabilities",
 706                                                        P_("Capabilities"),
 707                                                        P_("Capabilities"),
 708                                                        G_TYPE_DBUS_CAPABILITY_FLAGS,
 709                                                        G_DBUS_CAPABILITY_FLAGS_NONE,
 710                                                        G_PARAM_READABLE |
 711                                                        G_PARAM_STATIC_NAME |
 712                                                        G_PARAM_STATIC_BLURB |
 713                                                        G_PARAM_STATIC_NICK));
 714
 715   /**
 716    * GDBusConnection:authentication-observer:
 717    *
 718    * A #GDBusAuthObserver object to assist in the authentication process or %NULL.
 719    *
 720    * Since: 2.26
 721    */
 722   g_object_class_install_property (gobject_class,
 723                                    PROP_AUTHENTICATION_OBSERVER,
 724                                    g_param_spec_object ("authentication-observer",
 725                                                         P_("Authentication Observer"),
 726                                                         P_("Object used to assist in the authentication process"),
 727                                                         G_TYPE_DBUS_AUTH_OBSERVER,
 728                                                         G_PARAM_WRITABLE |
 729                                                         G_PARAM_CONSTRUCT_ONLY |
 730                                                         G_PARAM_STATIC_NAME |
 731                                                         G_PARAM_STATIC_BLURB |
 732                                                         G_PARAM_STATIC_NICK));
 733
 734   /**
 735    * GDBusConnection::closed:
 736    * @connection: The #GDBusConnection emitting the signal.
 737    * @remote_peer_vanished: %TRUE if @connection is closed because the
 738    * remote peer closed its end of the connection.
 739    * @error: A #GError with more details about the event or %NULL.
 740    *
 741    * Emitted when the connection is closed.
 742    *
 743    * The cause of this event can be
 744    * <itemizedlist>
 745    * <listitem><para>
 746    *    If g_dbus_connection_close() is called. In this case
 747    *    @remote_peer_vanished is set to %FALSE and @error is %NULL.
 748    * </para></listitem>
 749    * <listitem><para>
 750    *    If the remote peer closes the connection. In this case
 751    *    @remote_peer_vanished is set to %TRUE and @error is set.
 752    * </para></listitem>
 753    * <listitem><para>
 754    *    If the remote peer sends invalid or malformed data. In this
 755    *    case @remote_peer_vanished is set to %FALSE and @error
 756    *    is set.
 757    * </para></listitem>
 758    * </itemizedlist>
 759    *
 760    * Upon receiving this signal, you should give up your reference to
 761    * @connection. You are guaranteed that this signal is emitted only
 762    * once.
 763    *
 764    * Since: 2.26
 765    */
 766   signals[CLOSED_SIGNAL] = g_signal_new ("closed",
 767                                          G_TYPE_DBUS_CONNECTION,
 768                                          G_SIGNAL_RUN_LAST,
 769                                          G_STRUCT_OFFSET (GDBusConnectionClass, closed),
 770                                          NULL,
 771                                          NULL,
 772                                          _gio_marshal_VOID__BOOLEAN_BOXED,
 773                                          G_TYPE_NONE,
 774                                          2,
 775                                          G_TYPE_BOOLEAN,
 776                                          G_TYPE_ERROR);
 777 }
 778
 779 static void
 780 g_dbus_connection_init (GDBusConnection *connection)
 781 {
 782   connection->priv = G_TYPE_INSTANCE_GET_PRIVATE (connection, G_TYPE_DBUS_CONNECTION, GDBusConnectionPrivate);
 783
 784   connection->priv->lock = g_mutex_new ();
 785   connection->priv->init_lock = g_mutex_new ();
 786
 787   connection->priv->map_method_serial_to_send_message_data = g_hash_table_new (g_direct_hash, g_direct_equal);
 788
 789   connection->priv->map_rule_to_signal_data = g_hash_table_new (g_str_hash,
 790                                                                 g_str_equal);
 791   connection->priv->map_id_to_signal_data = g_hash_table_new (g_direct_hash,
 792                                                               g_direct_equal);
 793   connection->priv->map_sender_to_signal_data_array = g_hash_table_new_full (g_str_hash,
 794                                                                              g_str_equal,
 795                                                                              g_free,
 796                                                                              NULL);
 797
 798   connection->priv->map_object_path_to_eo = g_hash_table_new_full (g_str_hash,
 799                                                                    g_str_equal,
 800                                                                    NULL,
 801                                                                    (GDestroyNotify) exported_object_free);
 802
 803   connection->priv->map_id_to_ei = g_hash_table_new (g_direct_hash,
 804                                                      g_direct_equal);
 805
 806   connection->priv->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
 807                                                                    g_str_equal,
 808                                                                    NULL,
 809                                                                    (GDestroyNotify) exported_subtree_free);
 810
 811   connection->priv->map_id_to_es = g_hash_table_new (g_direct_hash,
 812                                                      g_direct_equal);
 813
 814   connection->priv->main_context_at_construction = g_main_context_get_thread_default ();
 815   if (connection->priv->main_context_at_construction != NULL)
 816     g_main_context_ref (connection->priv->main_context_at_construction);
 817
 818   connection->priv->filters = g_ptr_array_new ();
 819 }
 820
 821 /**
 822  * g_dbus_connection_get_stream:
 823  * @connection: a #GDBusConnection
 824  *
 825  * Gets the underlying stream used for IO.
 826  *
 827  * Returns: the stream used for IO
 828  *
 829  * Since: 2.26
 830  */
 831 GIOStream *
 832 g_dbus_connection_get_stream (GDBusConnection *connection)
 833 {
 834   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
 835   return connection->priv->stream;
 836 }
 837
 838
 839 /**
 840  * g_dbus_connection_is_closed:
 841  * @connection: A #GDBusConnection.
 842  *
 843  * Gets whether @connection is closed.
 844  *
 845  * Returns: %TRUE if the connection is closed, %FALSE otherwise.
 846  *
 847  * Since: 2.26
 848  */
 849 gboolean
 850 g_dbus_connection_is_closed (GDBusConnection *connection)
 851 {
 852   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
 853   return connection->priv->closed;
 854 }
 855
 856 /**
 857  * g_dbus_connection_get_capabilities:
 858  * @connection: A #GDBusConnection.
 859  *
 860  * Gets the capabilities negotiated with the remote peer
 861  *
 862  * Returns: Zero or more flags from the #GDBusCapabilityFlags enumeration.
 863  *
 864  * Since: 2.26
 865  */
 866 GDBusCapabilityFlags
 867 g_dbus_connection_get_capabilities (GDBusConnection *connection)
 868 {
 869   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), G_DBUS_CAPABILITY_FLAGS_NONE);
 870   return connection->priv->capabilities;
 871 }
 872
 873
 874 /* ---------------------------------------------------------------------------------------------------- */
 875
 876 typedef struct
 877 {
 878   GDBusConnection *connection;
 879   GError *error;
 880   gboolean remote_peer_vanished;
 881 } EmitClosedData;
 882
 883 static void
 884 emit_closed_data_free (EmitClosedData *data)
 885 {
 886   g_object_unref (data->connection);
 887   if (data->error != NULL)
 888     g_error_free (data->error);
 889   g_free (data);
 890 }
 891
 892 static gboolean
 893 emit_closed_in_idle (gpointer user_data)
 894 {
 895   EmitClosedData *data = user_data;
 896   gboolean result;
 897
 898   g_object_notify (G_OBJECT (data->connection), "closed");
 899   g_signal_emit (data->connection,
 900                  signals[CLOSED_SIGNAL],
 901                  0,
 902                  data->remote_peer_vanished,
 903                  data->error,
 904                  &result);
 905   return FALSE;
 906 }
 907
 908 /* Can be called from any thread, must hold lock */
 909 static void
 910 set_closed_unlocked (GDBusConnection *connection,
 911                      gboolean         remote_peer_vanished,
 912                      GError          *error)
 913 {
 914   GSource *idle_source;
 915   EmitClosedData *data;
 916
 917   CONNECTION_ENSURE_LOCK (connection);
 918
 919   g_assert (!connection->priv->closed);
 920
 921   connection->priv->closed = TRUE;
 922
 923   data = g_new0 (EmitClosedData, 1);
 924   data->connection = g_object_ref (connection);
 925   data->remote_peer_vanished = remote_peer_vanished;
 926   data->error = error != NULL ? g_error_copy (error) : NULL;
 927
 928   idle_source = g_idle_source_new ();
 929   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
 930   g_source_set_callback (idle_source,
 931                          emit_closed_in_idle,
 932                          data,
 933                          (GDestroyNotify) emit_closed_data_free);
 934   g_source_attach (idle_source, connection->priv->main_context_at_construction);
 935   g_source_unref (idle_source);
 936 }
 937
 938 /* ---------------------------------------------------------------------------------------------------- */
 939
 940 /**
 941  * g_dbus_connection_close:
 942  * @connection: A #GDBusConnection.
 943  *
 944  * Closes @connection. Note that this never causes the process to
 945  * exit (this might only happen if the other end of a shared message
 946  * bus connection disconnects).
 947  *
 948  * If @connection is already closed, this method does nothing.
 949  *
 950  * Since: 2.26
 951  */
 952 void
 953 g_dbus_connection_close (GDBusConnection *connection)
 954 {
 955   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
 956
 957   CONNECTION_LOCK (connection);
 958   if (!connection->priv->closed)
 959     {
 960       GError *error = NULL;
 961
 962       /* TODO: do this async */
 963       //g_debug ("closing connection %p's stream %p", connection, connection->priv->stream);
 964       if (!g_io_stream_close (connection->priv->stream, NULL, &error))
 965         {
 966           g_warning ("Error closing stream: %s", error->message);
 967           g_error_free (error);
 968         }
 969
 970       set_closed_unlocked (connection, FALSE, NULL);
 971     }
 972   CONNECTION_UNLOCK (connection);
 973 }
 974
 975 /* ---------------------------------------------------------------------------------------------------- */
 976
 977 static gboolean
 978 g_dbus_connection_send_message_unlocked (GDBusConnection   *connection,
 979                                          GDBusMessage      *message,
 980                                          volatile guint32  *out_serial,
 981                                          GError           **error)
 982 {
 983   guchar *blob;
 984   gsize blob_size;
 985   guint32 serial_to_use;
 986   gboolean ret;
 987
 988   CONNECTION_ENSURE_LOCK (connection);
 989
 990   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
 991   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
 992
 993   /* TODO: check all necessary headers are present */
 994
 995   ret = FALSE;
 996   blob = NULL;
 997
 998   if (out_serial != NULL)
 999     *out_serial = 0;
1000
1001   if (connection->priv->closed)
1002     {
1003       g_set_error_literal (error,
1004                            G_IO_ERROR,
1005                            G_IO_ERROR_CLOSED,
1006                            _("The connection is closed"));
1007       goto out;
1008     }
1009
1010   blob = g_dbus_message_to_blob (message,
1011                                  &blob_size,
1012                                  error);
1013   if (blob == NULL)
1014     goto out;
1015
1016   serial_to_use = ++connection->priv->last_serial; /* TODO: handle overflow */
1017
1018   switch (blob[0])
1019     {
1020     case 'l':
1021       ((guint32 *) blob)[2] = GUINT32_TO_LE (serial_to_use);
1022       break;
1023     case 'B':
1024       ((guint32 *) blob)[2] = GUINT32_TO_BE (serial_to_use);
1025       break;
1026     default:
1027       g_assert_not_reached ();
1028       break;
1029     }
1030
1031 #if 0
1032   g_printerr ("Writing message of %" G_GSIZE_FORMAT " bytes (serial %d) on %p:\n",
1033               blob_size, serial_to_use, connection);
1034   g_printerr ("----\n");
1035   hexdump (blob, blob_size);
1036   g_printerr ("----\n");
1037 #endif
1038
1039   /* TODO: use connection->priv->auth to encode the blob */
1040
1041   if (out_serial != NULL)
1042     *out_serial = serial_to_use;
1043
1044   g_dbus_message_set_serial (message, serial_to_use);
1045
1046   _g_dbus_worker_send_message (connection->priv->worker,
1047                                message,
1048                                (gchar*) blob,
1049                                blob_size);
1050   blob = NULL; /* since _g_dbus_worker_send_message() steals the blob */
1051
1052   ret = TRUE;
1053
1054  out:
1055   g_free (blob);
1056
1057   return ret;
1058 }
1059
1060 /**
1061  * g_dbus_connection_send_message:
1062  * @connection: A #GDBusConnection.
1063  * @message: A #GDBusMessage
1064  * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
1065  * @error: Return location for error or %NULL.
1066  *
1067  * Asynchronously sends @message to the peer represented by @connection.
1068  *
1069  * If @out_serial is not %NULL, then the serial number assigned to
1070  * @message by @connection will be written to this location prior to
1071  * submitting the message to the underlying transport.
1072  *
1073  * If @connection is closed then the operation will fail with
1074  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
1075  * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
1076  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1077  *
1078  * See <xref linkend="gdbus-server"/> and <xref
1079  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1080  * low-level API to send and receive UNIX file descriptors.
1081  *
1082  * Returns: %TRUE if the message was well-formed and queued for
1083  * transmission, %FALSE if @error is set.
1084  *
1085  * Since: 2.26
1086  */
1087 gboolean
1088 g_dbus_connection_send_message (GDBusConnection   *connection,
1089                                 GDBusMessage      *message,
1090                                 volatile guint32  *out_serial,
1091                                 GError           **error)
1092 {
1093   gboolean ret;
1094
1095   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1096   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
1097   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1098
1099   CONNECTION_LOCK (connection);
1100   ret = g_dbus_connection_send_message_unlocked (connection, message, out_serial, error);
1101   CONNECTION_UNLOCK (connection);
1102   return ret;
1103 }
1104
1105 /* ---------------------------------------------------------------------------------------------------- */
1106
1107 typedef struct
1108 {
1109   volatile gint ref_count;
1110   GDBusConnection *connection;
1111   guint32 serial;
1112   GSimpleAsyncResult *simple;
1113
1114   GMainContext *main_context;
1115
1116   GCancellable *cancellable;
1117
1118   gulong cancellable_handler_id;
1119
1120   GSource *timeout_source;
1121
1122   gboolean delivered;
1123 } SendMessageData;
1124
1125 static SendMessageData *
1126 send_message_data_ref (SendMessageData *data)
1127 {
1128   g_atomic_int_inc (&data->ref_count);
1129   return data;
1130 }
1131
1132 static void
1133 send_message_data_unref (SendMessageData *data)
1134 {
1135   if (g_atomic_int_dec_and_test (&data->ref_count))
1136     {
1137       g_assert (data->timeout_source == NULL);
1138       g_assert (data->simple == NULL);
1139       g_assert (data->cancellable_handler_id == 0);
1140       g_object_unref (data->connection);
1141       if (data->cancellable != NULL)
1142         g_object_unref (data->cancellable);
1143       if (data->main_context != NULL)
1144         g_main_context_unref (data->main_context);
1145       g_free (data);
1146     }
1147 }
1148
1149 /* ---------------------------------------------------------------------------------------------------- */
1150
1151 /* can be called from any thread with lock held - caller must have prepared GSimpleAsyncResult already */
1152 static void
1153 send_message_with_reply_deliver (SendMessageData *data)
1154 {
1155   CONNECTION_ENSURE_LOCK (data->connection);
1156
1157   g_assert (!data->delivered);
1158
1159   data->delivered = TRUE;
1160
1161   g_simple_async_result_complete_in_idle (data->simple);
1162   g_object_unref (data->simple);
1163   data->simple = NULL;
1164
1165   if (data->timeout_source != NULL)
1166     {
1167       g_source_destroy (data->timeout_source);
1168       data->timeout_source = NULL;
1169     }
1170   if (data->cancellable_handler_id > 0)
1171     {
1172       g_cancellable_disconnect (data->cancellable, data->cancellable_handler_id);
1173       data->cancellable_handler_id = 0;
1174     }
1175
1176   g_warn_if_fail (g_hash_table_remove (data->connection->priv->map_method_serial_to_send_message_data,
1177                                        GUINT_TO_POINTER (data->serial)));
1178
1179   send_message_data_unref (data);
1180 }
1181
1182 /* ---------------------------------------------------------------------------------------------------- */
1183
1184 /* must hold lock */
1185 static void
1186 send_message_data_deliver_reply_unlocked (SendMessageData *data,
1187                                           GDBusMessage    *reply)
1188 {
1189   if (data->delivered)
1190     goto out;
1191
1192   g_simple_async_result_set_op_res_gpointer (data->simple,
1193                                              g_object_ref (reply),
1194                                              g_object_unref);
1195
1196   send_message_with_reply_deliver (data);
1197
1198  out:
1199   ;
1200 }
1201
1202 /* ---------------------------------------------------------------------------------------------------- */
1203
1204 static gboolean
1205 send_message_with_reply_cancelled_idle_cb (gpointer user_data)
1206 {
1207   SendMessageData *data = user_data;
1208
1209   CONNECTION_LOCK (data->connection);
1210   if (data->delivered)
1211     goto out;
1212
1213   g_simple_async_result_set_error (data->simple,
1214                                    G_IO_ERROR,
1215                                    G_IO_ERROR_CANCELLED,
1216                                    _("Operation was cancelled"));
1217
1218   send_message_with_reply_deliver (data);
1219
1220  out:
1221   CONNECTION_UNLOCK (data->connection);
1222   return FALSE;
1223 }
1224
1225 /* Can be called from any thread with or without lock held */
1226 static void
1227 send_message_with_reply_cancelled_cb (GCancellable *cancellable,
1228                                       gpointer      user_data)
1229 {
1230   SendMessageData *data = user_data;
1231   GSource *idle_source;
1232
1233   /* postpone cancellation to idle handler since we may be called directly
1234    * via g_cancellable_connect() (e.g. holding lock)
1235    */
1236   idle_source = g_idle_source_new ();
1237   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1238   g_source_set_callback (idle_source,
1239                          send_message_with_reply_cancelled_idle_cb,
1240                          send_message_data_ref (data),
1241                          (GDestroyNotify) send_message_data_unref);
1242   g_source_attach (idle_source, data->main_context);
1243   g_source_unref (idle_source);
1244 }
1245
1246 /* ---------------------------------------------------------------------------------------------------- */
1247
1248 static gboolean
1249 send_message_with_reply_timeout_cb (gpointer user_data)
1250 {
1251   SendMessageData *data = user_data;
1252
1253   CONNECTION_LOCK (data->connection);
1254   if (data->delivered)
1255     goto out;
1256
1257   g_simple_async_result_set_error (data->simple,
1258                                    G_IO_ERROR,
1259                                    G_IO_ERROR_TIMED_OUT,
1260                                    _("Timeout was reached"));
1261
1262   send_message_with_reply_deliver (data);
1263
1264  out:
1265   CONNECTION_UNLOCK (data->connection);
1266
1267   return FALSE;
1268 }
1269
1270 /* ---------------------------------------------------------------------------------------------------- */
1271
1272 static void
1273 g_dbus_connection_send_message_with_reply_unlocked (GDBusConnection     *connection,
1274                                                     GDBusMessage        *message,
1275                                                     gint                 timeout_msec,
1276                                                     volatile guint32    *out_serial,
1277                                                     GCancellable        *cancellable,
1278                                                     GAsyncReadyCallback  callback,
1279                                                     gpointer             user_data)
1280 {
1281   GSimpleAsyncResult *simple;
1282   SendMessageData *data;
1283   GError *error;
1284   volatile guint32 serial;
1285
1286   data = NULL;
1287
1288   if (out_serial == NULL)
1289     out_serial = &serial;
1290
1291   if (timeout_msec == -1)
1292     timeout_msec = 30 * 1000; /* TODO: check 30 secs is the default timeout */
1293
1294   simple = g_simple_async_result_new (G_OBJECT (connection),
1295                                       callback,
1296                                       user_data,
1297                                       g_dbus_connection_send_message_with_reply);
1298
1299   if (g_cancellable_is_cancelled (cancellable))
1300     {
1301       g_simple_async_result_set_error (simple,
1302                                        G_IO_ERROR,
1303                                        G_IO_ERROR_CANCELLED,
1304                                        _("Operation was cancelled"));
1305       g_simple_async_result_complete_in_idle (simple);
1306       g_object_unref (simple);
1307       goto out;
1308     }
1309
1310   if (connection->priv->closed)
1311     {
1312       g_simple_async_result_set_error (simple,
1313                                        G_IO_ERROR,
1314                                        G_IO_ERROR_CLOSED,
1315                                        _("The connection is closed"));
1316       g_simple_async_result_complete_in_idle (simple);
1317       g_object_unref (simple);
1318       goto out;
1319     }
1320
1321   error = NULL;
1322   if (!g_dbus_connection_send_message_unlocked (connection, message, out_serial, &error))
1323     {
1324       g_simple_async_result_set_from_error (simple, error);
1325       g_simple_async_result_complete_in_idle (simple);
1326       g_object_unref (simple);
1327       goto out;
1328     }
1329
1330   data = g_new0 (SendMessageData, 1);
1331   data->ref_count = 1;
1332   data->connection = g_object_ref (connection);
1333   data->simple = simple;
1334   data->serial = *out_serial;
1335   data->main_context = g_main_context_get_thread_default ();
1336   if (data->main_context != NULL)
1337     g_main_context_ref (data->main_context);
1338
1339   if (cancellable != NULL)
1340     {
1341       data->cancellable = g_object_ref (cancellable);
1342       data->cancellable_handler_id = g_cancellable_connect (cancellable,
1343                                                             G_CALLBACK (send_message_with_reply_cancelled_cb),
1344                                                             send_message_data_ref (data),
1345                                                             (GDestroyNotify) send_message_data_unref);
1346       g_object_set_data_full (G_OBJECT (simple),
1347                               "cancellable",
1348                               g_object_ref (cancellable),
1349                               (GDestroyNotify) g_object_unref);
1350     }
1351
1352   data->timeout_source = g_timeout_source_new (timeout_msec);
1353   g_source_set_priority (data->timeout_source, G_PRIORITY_DEFAULT);
1354   g_source_set_callback (data->timeout_source,
1355                          send_message_with_reply_timeout_cb,
1356                          send_message_data_ref (data),
1357                          (GDestroyNotify) send_message_data_unref);
1358   g_source_attach (data->timeout_source, data->main_context);
1359   g_source_unref (data->timeout_source);
1360
1361   g_hash_table_insert (connection->priv->map_method_serial_to_send_message_data,
1362                        GUINT_TO_POINTER (*out_serial),
1363                        data);
1364
1365  out:
1366   ;
1367 }
1368
1369 /**
1370  * g_dbus_connection_send_message_with_reply:
1371  * @connection: A #GDBusConnection.
1372  * @message: A #GDBusMessage.
1373  * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
1374  * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
1375  * @cancellable: A #GCancellable or %NULL.
1376  * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
1377  * care about the result.
1378  * @user_data: The data to pass to @callback.
1379  *
1380  * Asynchronously sends @message to the peer represented by @connection.
1381  *
1382  * If @out_serial is not %NULL, then the serial number assigned to
1383  * @message by @connection will be written to this location prior to
1384  * submitting the message to the underlying transport.
1385  *
1386  * If @connection is closed then the operation will fail with
1387  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
1388  * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
1389  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1390  *
1391  * This is an asynchronous method. When the operation is finished, @callback will be invoked
1392  * in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
1393  * of the thread you are calling this method from. You can then call
1394  * g_dbus_connection_send_message_with_reply_finish() to get the result of the operation.
1395  * See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.
1396  *
1397  * See <xref linkend="gdbus-server"/> and <xref
1398  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1399  * low-level API to send and receive UNIX file descriptors.
1400  *
1401  * Since: 2.26
1402  */
1403 void
1404 g_dbus_connection_send_message_with_reply (GDBusConnection     *connection,
1405                                            GDBusMessage        *message,
1406                                            gint                 timeout_msec,
1407                                            volatile guint32    *out_serial,
1408                                            GCancellable        *cancellable,
1409                                            GAsyncReadyCallback  callback,
1410                                            gpointer             user_data)
1411 {
1412   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
1413   g_return_if_fail (G_IS_DBUS_MESSAGE (message));
1414   g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
1415
1416   CONNECTION_LOCK (connection);
1417   g_dbus_connection_send_message_with_reply_unlocked (connection,
1418                                                       message,
1419                                                       timeout_msec,
1420                                                       out_serial,
1421                                                       cancellable,
1422                                                       callback,
1423                                                       user_data);
1424   CONNECTION_UNLOCK (connection);
1425 }
1426
1427 /**
1428  * g_dbus_connection_send_message_with_reply_finish:
1429  * @connection: a #GDBusConnection
1430  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_send_message_with_reply().
1431  * @error: Return location for error or %NULL.
1432  *
1433  * Finishes an operation started with g_dbus_connection_send_message_with_reply().
1434  *
1435  * Note that @error is only set if a local in-process error
1436  * occured. That is to say that the returned #GDBusMessage object may
1437  * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
1438  * g_dbus_message_to_gerror() to transcode this to a #GError.
1439  *
1440  * See <xref linkend="gdbus-server"/> and <xref
1441  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1442  * low-level API to send and receive UNIX file descriptors.
1443  *
1444  * Returns: A #GDBusMessage or %NULL if @error is set.
1445  *
1446  * Since: 2.26
1447  */
1448 GDBusMessage *
1449 g_dbus_connection_send_message_with_reply_finish (GDBusConnection  *connection,
1450                                                   GAsyncResult     *res,
1451                                                   GError          **error)
1452 {
1453   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
1454   GDBusMessage *reply;
1455   GCancellable *cancellable;
1456
1457   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
1458   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1459
1460   reply = NULL;
1461
1462   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_send_message_with_reply);
1463
1464   if (g_simple_async_result_propagate_error (simple, error))
1465     goto out;
1466
1467   reply = g_object_ref (g_simple_async_result_get_op_res_gpointer (simple));
1468   cancellable = g_object_get_data (G_OBJECT (simple), "cancellable");
1469   if (cancellable != NULL && g_cancellable_is_cancelled (cancellable))
1470     {
1471       g_object_unref (reply);
1472       reply = NULL;
1473       g_set_error_literal (error,
1474                            G_IO_ERROR,
1475                            G_IO_ERROR_CANCELLED,
1476                            _("Operation was cancelled"));
1477     }
1478  out:
1479   return reply;
1480 }
1481
1482 /* ---------------------------------------------------------------------------------------------------- */
1483
1484 typedef struct
1485 {
1486   GAsyncResult *res;
1487   GMainContext *context;
1488   GMainLoop *loop;
1489 } SendMessageSyncData;
1490
1491 static void
1492 send_message_with_reply_sync_cb (GDBusConnection *connection,
1493                                  GAsyncResult    *res,
1494                                  gpointer         user_data)
1495 {
1496   SendMessageSyncData *data = user_data;
1497   data->res = g_object_ref (res);
1498   g_main_loop_quit (data->loop);
1499 }
1500
1501 /**
1502  * g_dbus_connection_send_message_with_reply_sync:
1503  * @connection: A #GDBusConnection.
1504  * @message: A #GDBusMessage.
1505  * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
1506  * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
1507  * @cancellable: A #GCancellable or %NULL.
1508  * @error: Return location for error or %NULL.
1509  *
1510  * Synchronously sends @message to the peer represented by @connection
1511  * and blocks the calling thread until a reply is received or the
1512  * timeout is reached. See g_dbus_connection_send_message_with_reply()
1513  * for the asynchronous version of this method.
1514  *
1515  * If @out_serial is not %NULL, then the serial number assigned to
1516  * @message by @connection will be written to this location prior to
1517  * submitting the message to the underlying transport.
1518  *
1519  * If @connection is closed then the operation will fail with
1520  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
1521  * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
1522  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1523  *
1524  * Note that @error is only set if a local in-process error
1525  * occured. That is to say that the returned #GDBusMessage object may
1526  * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
1527  * g_dbus_message_to_gerror() to transcode this to a #GError.
1528  *
1529  * See <xref linkend="gdbus-server"/> and <xref
1530  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1531  * low-level API to send and receive UNIX file descriptors.
1532  *
1533  * Returns: A #GDBusMessage that is the reply to @message or %NULL if @error is set.
1534  *
1535  * Since: 2.26
1536  */
1537 GDBusMessage *
1538 g_dbus_connection_send_message_with_reply_sync (GDBusConnection   *connection,
1539                                                 GDBusMessage      *message,
1540                                                 gint               timeout_msec,
1541                                                 volatile guint32  *out_serial,
1542                                                 GCancellable      *cancellable,
1543                                                 GError           **error)
1544 {
1545   SendMessageSyncData *data;
1546   GDBusMessage *reply;
1547
1548   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
1549   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
1550   g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
1551   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1552
1553   data = g_new0 (SendMessageSyncData, 1);
1554   data->context = g_main_context_new ();
1555   data->loop = g_main_loop_new (data->context, FALSE);
1556
1557   g_main_context_push_thread_default (data->context);
1558
1559   g_dbus_connection_send_message_with_reply (connection,
1560                                              message,
1561                                              timeout_msec,
1562                                              out_serial,
1563                                              cancellable,
1564                                              (GAsyncReadyCallback) send_message_with_reply_sync_cb,
1565                                              data);
1566   g_main_loop_run (data->loop);
1567   reply = g_dbus_connection_send_message_with_reply_finish (connection,
1568                                                             data->res,
1569                                                             error);
1570
1571   g_main_context_pop_thread_default (data->context);
1572
1573   g_main_context_unref (data->context);
1574   g_main_loop_unref (data->loop);
1575   g_object_unref (data->res);
1576   g_free (data);
1577
1578   return reply;
1579 }
1580
1581 /* ---------------------------------------------------------------------------------------------------- */
1582
1583 typedef struct
1584 {
1585   GDBusMessageFilterFunction func;
1586   gpointer user_data;
1587 } FilterCallback;
1588
1589 typedef struct
1590 {
1591   guint                       id;
1592   GDBusMessageFilterFunction  filter_function;
1593   gpointer                    user_data;
1594   GDestroyNotify              user_data_free_func;
1595 } FilterData;
1596
1597 /* Called in worker's thread - we must not block */
1598 static void
1599 on_worker_message_received (GDBusWorker  *worker,
1600                             GDBusMessage *message,
1601                             gpointer      user_data)
1602 {
1603   GDBusConnection *connection = G_DBUS_CONNECTION (user_data);
1604   FilterCallback *filters;
1605   gboolean consumed_by_filter;
1606   guint num_filters;
1607   guint n;
1608
1609   //g_debug ("in on_worker_message_received");
1610
1611   g_object_ref (connection);
1612
1613   /* First collect the set of callback functions */
1614   CONNECTION_LOCK (connection);
1615   num_filters = connection->priv->filters->len;
1616   filters = g_new0 (FilterCallback, num_filters);
1617   for (n = 0; n < num_filters; n++)
1618     {
1619       FilterData *data = connection->priv->filters->pdata[n];
1620       filters[n].func = data->filter_function;
1621       filters[n].user_data = data->user_data;
1622     }
1623   CONNECTION_UNLOCK (connection);
1624
1625   /* the call the filters in order (without holding the lock) */
1626   consumed_by_filter = FALSE;
1627   for (n = 0; n < num_filters; n++)
1628     {
1629       consumed_by_filter = filters[n].func (connection,
1630                                             message,
1631                                             filters[n].user_data);
1632       if (consumed_by_filter)
1633         break;
1634     }
1635
1636   /* Standard dispatch unless the filter ate the message */
1637   if (!consumed_by_filter)
1638     {
1639       GDBusMessageType message_type;
1640
1641       message_type = g_dbus_message_get_message_type (message);
1642       if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_RETURN || message_type == G_DBUS_MESSAGE_TYPE_ERROR)
1643         {
1644           guint32 reply_serial;
1645           SendMessageData *send_message_data;
1646
1647           reply_serial = g_dbus_message_get_reply_serial (message);
1648           CONNECTION_LOCK (connection);
1649           send_message_data = g_hash_table_lookup (connection->priv->map_method_serial_to_send_message_data,
1650                                                    GUINT_TO_POINTER (reply_serial));
1651           if (send_message_data != NULL)
1652             {
1653               //g_debug ("delivering reply/error for serial %d for %p", reply_serial, connection);
1654               send_message_data_deliver_reply_unlocked (send_message_data, message);
1655             }
1656           else
1657             {
1658               //g_debug ("message reply/error for serial %d but no SendMessageData found for %p", reply_serial, connection);
1659             }
1660           CONNECTION_UNLOCK (connection);
1661         }
1662       else if (message_type == G_DBUS_MESSAGE_TYPE_SIGNAL)
1663         {
1664           CONNECTION_LOCK (connection);
1665           distribute_signals (connection, message);
1666           CONNECTION_UNLOCK (connection);
1667         }
1668       else if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_CALL)
1669         {
1670           CONNECTION_LOCK (connection);
1671           distribute_method_call (connection, message);
1672           CONNECTION_UNLOCK (connection);
1673         }
1674     }
1675
1676   g_object_unref (connection);
1677   g_free (filters);
1678 }
1679
1680 /* Called in worker's thread - we must not block */
1681 static void
1682 on_worker_closed (GDBusWorker *worker,
1683                   gboolean     remote_peer_vanished,
1684                   GError      *error,
1685                   gpointer     user_data)
1686 {
1687   GDBusConnection *connection = G_DBUS_CONNECTION (user_data);
1688
1689   //g_debug ("in on_worker_closed: %s", error->message);
1690
1691   CONNECTION_LOCK (connection);
1692   if (!connection->priv->closed)
1693     set_closed_unlocked (connection, remote_peer_vanished, error);
1694   CONNECTION_UNLOCK (connection);
1695 }
1696
1697 /* ---------------------------------------------------------------------------------------------------- */
1698
1699 /* Determines the biggest set of capabilities we can support on this connection */
1700 static GDBusCapabilityFlags
1701 get_offered_capabilities_max (GDBusConnection *connection)
1702 {
1703       GDBusCapabilityFlags ret;
1704       ret = G_DBUS_CAPABILITY_FLAGS_NONE;
1705 #ifdef G_OS_UNIX
1706       if (G_IS_UNIX_CONNECTION (connection->priv->stream))
1707         ret |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
1708 #endif
1709       return ret;
1710 }
1711
1712 static gboolean
1713 initable_init (GInitable     *initable,
1714                GCancellable  *cancellable,
1715                GError       **error)
1716 {
1717   GDBusConnection *connection = G_DBUS_CONNECTION (initable);
1718   gboolean ret;
1719
1720   /* This method needs to be idempotent to work with the singleton
1721    * pattern. See the docs for g_initable_init(). We implement this by
1722    * locking.
1723    *
1724    * Unfortunately we can't use the main lock since the on_worker_*()
1725    * callbacks above needs the lock during initialization (for message
1726    * bus connections we do a synchronous Hello() call on the bus).
1727    */
1728   g_mutex_lock (connection->priv->init_lock);
1729
1730   ret = FALSE;
1731
1732   if (connection->priv->is_initialized)
1733     {
1734       if (connection->priv->stream != NULL)
1735         ret = TRUE;
1736       else
1737         g_assert (connection->priv->initialization_error != NULL);
1738       goto out;
1739     }
1740   g_assert (connection->priv->initialization_error == NULL);
1741
1742   /* The user can pass multiple (but mutally exclusive) construct
1743    * properties:
1744    *
1745    *  - stream (of type GIOStream)
1746    *  - address (of type gchar*)
1747    *
1748    * At the end of the day we end up with a non-NULL GIOStream
1749    * object in connection->priv->stream.
1750    */
1751   if (connection->priv->address != NULL)
1752     {
1753       g_assert (connection->priv->stream == NULL);
1754
1755       if ((connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER) ||
1756           (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS))
1757         {
1758           g_set_error_literal (error,
1759                                G_IO_ERROR,
1760                                G_IO_ERROR_INVALID_ARGUMENT,
1761                                _("Unsupported flags encountered when constructing a client-side connection"));
1762           goto out;
1763         }
1764
1765       connection->priv->stream = g_dbus_address_get_stream_sync (connection->priv->address,
1766                                                                  NULL, /* TODO: out_guid */
1767                                                                  cancellable,
1768                                                                  &connection->priv->initialization_error);
1769       if (connection->priv->stream == NULL)
1770         goto out;
1771     }
1772   else if (connection->priv->stream != NULL)
1773     {
1774       /* nothing to do */
1775     }
1776   else
1777     {
1778       g_assert_not_reached ();
1779     }
1780
1781   /* Authenticate the connection */
1782   if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER)
1783     {
1784       g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT));
1785       g_assert (connection->priv->guid != NULL);
1786       connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
1787       if (!_g_dbus_auth_run_server (connection->priv->auth,
1788                                     connection->priv->authentication_observer,
1789                                     connection->priv->guid,
1790                                     (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS),
1791                                     get_offered_capabilities_max (connection),
1792                                     &connection->priv->capabilities,
1793                                     &connection->priv->crendentials,
1794                                     cancellable,
1795                                     &connection->priv->initialization_error))
1796         goto out;
1797     }
1798   else if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT)
1799     {
1800       g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER));
1801       g_assert (connection->priv->guid == NULL);
1802       connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
1803       connection->priv->guid = _g_dbus_auth_run_client (connection->priv->auth,
1804                                                         get_offered_capabilities_max (connection),
1805                                                         &connection->priv->capabilities,
1806                                                         cancellable,
1807                                                         &connection->priv->initialization_error);
1808       if (connection->priv->guid == NULL)
1809         goto out;
1810     }
1811
1812   if (connection->priv->authentication_observer != NULL)
1813     {
1814       g_object_unref (connection->priv->authentication_observer);
1815       connection->priv->authentication_observer = NULL;
1816     }
1817
1818   //g_output_stream_flush (G_SOCKET_CONNECTION (connection->priv->stream)
1819
1820   //g_debug ("haz unix fd passing powers: %d", connection->priv->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING);
1821
1822   /* Hack used until
1823    *
1824    *  https://bugzilla.gnome.org/show_bug.cgi?id=616458
1825    *
1826    * has been resolved
1827    */
1828   if (G_IS_SOCKET_CONNECTION (connection->priv->stream))
1829     {
1830       g_socket_set_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (connection->priv->stream)), FALSE);
1831     }
1832
1833   connection->priv->worker = _g_dbus_worker_new (connection->priv->stream,
1834                                                  connection->priv->capabilities,
1835                                                  on_worker_message_received,
1836                                                  on_worker_closed,
1837                                                  connection);
1838
1839   /* if a bus connection, invoke org.freedesktop.DBus.Hello - this is how we're getting a name */
1840   if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
1841     {
1842       GVariant *hello_result;
1843       const gchar *s;
1844
1845       hello_result = g_dbus_connection_call_sync (connection,
1846                                                   "org.freedesktop.DBus", /* name */
1847                                                   "/org/freedesktop/DBus", /* path */
1848                                                   "org.freedesktop.DBus", /* interface */
1849                                                   "Hello",
1850                                                   NULL, /* parameters */
1851                                                   G_DBUS_CALL_FLAGS_NONE,
1852                                                   -1,
1853                                                   NULL, /* TODO: cancellable */
1854                                                   &connection->priv->initialization_error);
1855       if (hello_result == NULL)
1856         goto out;
1857
1858       g_variant_get (hello_result, "(s)", &s);
1859       connection->priv->bus_unique_name = g_strdup (s);
1860       g_variant_unref (hello_result);
1861       //g_debug ("unique name is `%s'", connection->priv->bus_unique_name);
1862     }
1863
1864   connection->priv->is_initialized = TRUE;
1865
1866   ret = TRUE;
1867  out:
1868   if (!ret)
1869     {
1870       g_assert (connection->priv->initialization_error != NULL);
1871       g_propagate_error (error, g_error_copy (connection->priv->initialization_error));
1872     }
1873
1874   g_mutex_unlock (connection->priv->init_lock);
1875
1876   return ret;
1877 }
1878
1879 static void
1880 initable_iface_init (GInitableIface *initable_iface)
1881 {
1882   initable_iface->init = initable_init;
1883 }
1884
1885 /* ---------------------------------------------------------------------------------------------------- */
1886
1887 static void
1888 async_init_thread (GSimpleAsyncResult *res,
1889                    GObject            *object,
1890                    GCancellable       *cancellable)
1891 {
1892   GError *error = NULL;
1893
1894   if (!g_initable_init (G_INITABLE (object), cancellable, &error))
1895     {
1896       g_simple_async_result_set_from_error (res, error);
1897       g_error_free (error);
1898     }
1899 }
1900
1901 static void
1902 async_initable_init_async (GAsyncInitable      *initable,
1903                            gint                 io_priority,
1904                            GCancellable        *cancellable,
1905                            GAsyncReadyCallback  callback,
1906                            gpointer             user_data)
1907 {
1908   GSimpleAsyncResult *res;
1909
1910   g_return_if_fail (G_IS_INITABLE (initable));
1911
1912   res = g_simple_async_result_new (G_OBJECT (initable), callback, user_data,
1913                                    async_initable_init_async);
1914   g_simple_async_result_run_in_thread (res, async_init_thread,
1915                                        io_priority, cancellable);
1916   g_object_unref (res);
1917 }
1918
1919 static gboolean
1920 async_initable_init_finish (GAsyncInitable  *initable,
1921                             GAsyncResult    *res,
1922                             GError         **error)
1923 {
1924   return TRUE; /* Errors handled by base impl */
1925 }
1926
1927 static void
1928 async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
1929 {
1930   /* We basically just want to use GIO's default implementation - though that one is
1931    * unfortunately broken, see #615111. So we copy-paste a fixed-up version.
1932    */
1933   async_initable_iface->init_async = async_initable_init_async;
1934   async_initable_iface->init_finish = async_initable_init_finish;
1935 }
1936
1937 /* ---------------------------------------------------------------------------------------------------- */
1938
1939 /**
1940  * g_dbus_connection_new:
1941  * @stream: A #GIOStream.
1942  * @guid: The GUID to use if a authenticating as a server or %NULL.
1943  * @flags: Flags describing how to make the connection.
1944  * @observer: A #GDBusAuthObserver or %NULL.
1945  * @cancellable: A #GCancellable or %NULL.
1946  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
1947  * @user_data: The data to pass to @callback.
1948  *
1949  * Asynchronously sets up a D-Bus connection for exchanging D-Bus messages
1950  * with the end represented by @stream.
1951  *
1952  * If %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER is set in @flags,
1953  * @observer (if not %NULL) is used to assist in the client
1954  * authentication process.
1955  *
1956  * When the operation is finished, @callback will be invoked. You can
1957  * then call g_dbus_connection_new_finish() to get the result of the
1958  * operation.
1959  *
1960  * This is a asynchronous failable constructor. See
1961  * g_dbus_connection_new_sync() for the synchronous
1962  * version.
1963  *
1964  * Since: 2.26
1965  */
1966 void
1967 g_dbus_connection_new (GIOStream            *stream,
1968                        const gchar          *guid,
1969                        GDBusConnectionFlags  flags,
1970                        GDBusAuthObserver    *observer,
1971                        GCancellable         *cancellable,
1972                        GAsyncReadyCallback   callback,
1973                        gpointer              user_data)
1974 {
1975   g_return_if_fail (G_IS_IO_STREAM (stream));
1976   g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
1977                               G_PRIORITY_DEFAULT,
1978                               cancellable,
1979                               callback,
1980                               user_data,
1981                               "stream", stream,
1982                               "guid", guid,
1983                               "flags", flags,
1984                               "authentication-observer", observer,
1985                               NULL);
1986 }
1987
1988 /**
1989  * g_dbus_connection_new_finish:
1990  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
1991  * @error: Return location for error or %NULL.
1992  *
1993  * Finishes an operation started with g_dbus_connection_new().
1994  *
1995  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
1996  *
1997  * Since: 2.26
1998  */
1999 GDBusConnection *
2000 g_dbus_connection_new_finish (GAsyncResult  *res,
2001                               GError       **error)
2002 {
2003   GObject *object;
2004   GObject *source_object;
2005
2006   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
2007   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2008
2009   source_object = g_async_result_get_source_object (res);
2010   g_assert (source_object != NULL);
2011   object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
2012                                         res,
2013                                         error);
2014   g_object_unref (source_object);
2015   if (object != NULL)
2016     return G_DBUS_CONNECTION (object);
2017   else
2018     return NULL;
2019 }
2020
2021 /**
2022  * g_dbus_connection_new_sync:
2023  * @stream: A #GIOStream.
2024  * @guid: The GUID to use if a authenticating as a server or %NULL.
2025  * @flags: Flags describing how to make the connection.
2026  * @observer: A #GDBusAuthObserver or %NULL.
2027  * @cancellable: A #GCancellable or %NULL.
2028  * @error: Return location for error or %NULL.
2029  *
2030  * Synchronously sets up a D-Bus connection for exchanging D-Bus messages
2031  * with the end represented by @stream.
2032  *
2033  * If %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER is set in @flags,
2034  * @observer (if not %NULL) is used to assist in the client
2035  * authentication process.
2036  *
2037  * This is a synchronous failable constructor. See
2038  * g_dbus_connection_new() for the asynchronous version.
2039  *
2040  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2041  *
2042  * Since: 2.26
2043  */
2044 GDBusConnection *
2045 g_dbus_connection_new_sync (GIOStream             *stream,
2046                             const gchar           *guid,
2047                             GDBusConnectionFlags   flags,
2048                             GDBusAuthObserver     *observer,
2049                             GCancellable          *cancellable,
2050                             GError               **error)
2051 {
2052   g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
2053   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2054   return g_initable_new (G_TYPE_DBUS_CONNECTION,
2055                          cancellable,
2056                          error,
2057                          "stream", stream,
2058                          "guid", guid,
2059                          "flags", flags,
2060                          "authentication-observer", observer,
2061                          NULL);
2062 }
2063
2064 /* ---------------------------------------------------------------------------------------------------- */
2065
2066 /**
2067  * g_dbus_connection_new_for_address:
2068  * @address: A D-Bus address.
2069  * @flags: Flags describing how to make the connection.
2070  * @cancellable: A #GCancellable or %NULL.
2071  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
2072  * @user_data: The data to pass to @callback.
2073  *
2074  * Asynchronously connects and sets up a D-Bus client connection for
2075  * exchanging D-Bus messages with an endpoint specified by @address
2076  * which must be in the D-Bus address format.
2077  *
2078  * This constructor can only be used to initiate client-side
2079  * connections - use g_dbus_connection_new() if you need to act as the
2080  * server. In particular, @flags cannot contain the
2081  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
2082  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
2083  *
2084  * When the operation is finished, @callback will be invoked. You can
2085  * then call g_dbus_connection_new_finish() to get the result of the
2086  * operation.
2087  *
2088  * This is a asynchronous failable constructor. See
2089  * g_dbus_connection_new_for_address_sync() for the synchronous
2090  * version.
2091  *
2092  * Since: 2.26
2093  */
2094 void
2095 g_dbus_connection_new_for_address (const gchar          *address,
2096                                    GDBusConnectionFlags  flags,
2097                                    GCancellable         *cancellable,
2098                                    GAsyncReadyCallback   callback,
2099                                    gpointer              user_data)
2100 {
2101   g_return_if_fail (address != NULL);
2102   g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
2103                               G_PRIORITY_DEFAULT,
2104                               cancellable,
2105                               callback,
2106                               user_data,
2107                               "address", address,
2108                               "flags", flags,
2109                               NULL);
2110 }
2111
2112 /**
2113  * g_dbus_connection_new_for_address_finish:
2114  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
2115  * @error: Return location for error or %NULL.
2116  *
2117  * Finishes an operation started with g_dbus_connection_new_for_address().
2118  *
2119  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2120  *
2121  * Since: 2.26
2122  */
2123 GDBusConnection *
2124 g_dbus_connection_new_for_address_finish (GAsyncResult  *res,
2125                                           GError       **error)
2126 {
2127   GObject *object;
2128   GObject *source_object;
2129
2130   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
2131   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2132
2133   source_object = g_async_result_get_source_object (res);
2134   g_assert (source_object != NULL);
2135   object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
2136                                         res,
2137                                         error);
2138   g_object_unref (source_object);
2139   if (object != NULL)
2140     return G_DBUS_CONNECTION (object);
2141   else
2142     return NULL;
2143 }
2144
2145 /**
2146  * g_dbus_connection_new_for_address_sync:
2147  * @address: A D-Bus address.
2148  * @flags: Flags describing how to make the connection.
2149  * @cancellable: A #GCancellable or %NULL.
2150  * @error: Return location for error or %NULL.
2151  *
2152  * Synchronously connects and sets up a D-Bus client connection for
2153  * exchanging D-Bus messages with an endpoint specified by @address
2154  * which must be in the D-Bus address format.
2155  *
2156  * This constructor can only be used to initiate client-side
2157  * connections - use g_dbus_connection_new_sync() if you need to act
2158  * as the server. In particular, @flags cannot contain the
2159  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
2160  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
2161  *
2162  * This is a synchronous failable constructor. See
2163  * g_dbus_connection_new_for_address() for the asynchronous version.
2164  *
2165  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2166  *
2167  * Since: 2.26
2168  */
2169 GDBusConnection *
2170 g_dbus_connection_new_for_address_sync (const gchar           *address,
2171                                         GDBusConnectionFlags   flags,
2172                                         GCancellable          *cancellable,
2173                                         GError               **error)
2174 {
2175   g_return_val_if_fail (address != NULL, NULL);
2176   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2177   return g_initable_new (G_TYPE_DBUS_CONNECTION,
2178                          cancellable,
2179                          error,
2180                          "address", address,
2181                          "flags", flags,
2182                          NULL);
2183 }
2184
2185 /* ---------------------------------------------------------------------------------------------------- */
2186
2187 /**
2188  * g_dbus_connection_set_exit_on_close:
2189  * @connection: A #GDBusConnection.
2190  * @exit_on_close: Whether the process should be terminated
2191  * when @connection is closed by the remote peer.
2192  *
2193  * Sets whether the process should be terminated when @connection is
2194  * closed by the remote peer. See #GDBusConnection:exit-on-close for
2195  * more details.
2196  *
2197  * Since: 2.26
2198  */
2199 void
2200 g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
2201                                      gboolean         exit_on_close)
2202 {
2203   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
2204   connection->priv->exit_on_close = exit_on_close;
2205 }
2206
2207 /**
2208  * g_dbus_connection_get_exit_on_close:
2209  * @connection: A #GDBusConnection.
2210  *
2211  * Gets whether the process is terminated when @connection is
2212  * closed by the remote peer. See
2213  * #GDBusConnection:exit-on-close for more details.
2214  *
2215  * Returns: Whether the process is terminated when @connection is
2216  * closed by the remote peer.
2217  *
2218  * Since: 2.26
2219  */
2220 gboolean
2221 g_dbus_connection_get_exit_on_close (GDBusConnection *connection)
2222 {
2223   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
2224   return connection->priv->exit_on_close;
2225 }
2226
2227 /**
2228  * g_dbus_connection_get_guid:
2229  * @connection: A #GDBusConnection.
2230  *
2231  * The GUID of the peer performing the role of server when
2232  * authenticating. See #GDBusConnection:guid for more details.
2233  *
2234  * Returns: The GUID. Do not free this string, it is owned by
2235  * @connection.
2236  *
2237  * Since: 2.26
2238  */
2239 const gchar *
2240 g_dbus_connection_get_guid (GDBusConnection *connection)
2241 {
2242   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2243   return connection->priv->guid;
2244 }
2245
2246 /**
2247  * g_dbus_connection_get_unique_name:
2248  * @connection: A #GDBusConnection.
2249  *
2250  * Gets the unique name of @connection as assigned by the message
2251  * bus. This can also be used to figure out if @connection is a
2252  * message bus connection.
2253  *
2254  * Returns: The unique name or %NULL if @connection is not a message
2255  * bus connection. Do not free this string, it is owned by
2256  * @connection.
2257  *
2258  * Since: 2.26
2259  */
2260 const gchar *
2261 g_dbus_connection_get_unique_name (GDBusConnection *connection)
2262 {
2263   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2264   return connection->priv->bus_unique_name;
2265 }
2266
2267 /**
2268  * g_dbus_connection_get_peer_credentials:
2269  * @connection: A #GDBusConnection.
2270  *
2271  * Gets the credentials of the authenticated peer. This will always
2272  * return %NULL unless @connection acted as a server
2273  * (e.g. %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER was passed)
2274  * when set up and the client passed credentials as part of the
2275  * authentication process.
2276  *
2277  * In a message bus setup, the message bus is always the server and
2278  * each application is a client. So this method will always return
2279  * %NULL for message bus clients.
2280  *
2281  * Returns: A #GCredentials or %NULL if not available. Do not free
2282  * this object, it is owned by @connection.
2283  *
2284  * Since: 2.26
2285  */
2286 GCredentials *
2287 g_dbus_connection_get_peer_credentials (GDBusConnection *connection)
2288 {
2289   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2290   return connection->priv->crendentials;
2291 }
2292
2293 /* ---------------------------------------------------------------------------------------------------- */
2294
2295 static guint _global_filter_id = 1;
2296
2297 /**
2298  * g_dbus_connection_add_filter:
2299  * @connection: A #GDBusConnection.
2300  * @filter_function: A filter function.
2301  * @user_data: User data to pass to @filter_function.
2302  * @user_data_free_func: Function to free @user_data with when filter
2303  * is removed or %NULL.
2304  *
2305  * Adds a message filter. Filters are handlers that are run on all
2306  * incoming messages, prior to standard dispatch. Filters are run in
2307  * the order that they were added.  The same handler can be added as a
2308  * filter more than once, in which case it will be run more than once.
2309  * Filters added during a filter callback won't be run on the message
2310  * being processed.
2311  *
2312  * Note that filters are run in a dedicated message handling thread so
2313  * they can't block and, generally, can't do anything but signal a
2314  * worker thread. Also note that filters are rarely needed - use API
2315  * such as g_dbus_connection_send_message_with_reply(),
2316  * g_dbus_connection_signal_subscribe() or
2317  * g_dbus_connection_call() instead.
2318  *
2319  * Returns: A filter identifier that can be used with
2320  * g_dbus_connection_remove_filter().
2321  *
2322  * Since: 2.26
2323  */
2324 guint
2325 g_dbus_connection_add_filter (GDBusConnection            *connection,
2326                               GDBusMessageFilterFunction  filter_function,
2327                               gpointer                    user_data,
2328                               GDestroyNotify              user_data_free_func)
2329 {
2330   FilterData *data;
2331
2332   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
2333   g_return_val_if_fail (filter_function != NULL, 0);
2334
2335   CONNECTION_LOCK (connection);
2336   data = g_new0 (FilterData, 1);
2337   data->id = _global_filter_id++; /* TODO: overflow etc. */
2338   data->filter_function = filter_function;
2339   data->user_data = user_data;
2340   data->user_data_free_func = user_data_free_func;
2341   g_ptr_array_add (connection->priv->filters, data);
2342   CONNECTION_UNLOCK (connection);
2343
2344   return data->id;
2345 }
2346
2347 /* only called from finalize(), removes all filters */
2348 static void
2349 purge_all_filters (GDBusConnection *connection)
2350 {
2351   guint n;
2352   for (n = 0; n < connection->priv->filters->len; n++)
2353     {
2354       FilterData *data = connection->priv->filters->pdata[n];
2355       if (data->user_data_free_func != NULL)
2356         data->user_data_free_func (data->user_data);
2357       g_free (data);
2358     }
2359 }
2360
2361 /**
2362  * g_dbus_connection_remove_filter:
2363  * @connection: a #GDBusConnection
2364  * @filter_id: an identifier obtained from g_dbus_connection_add_filter()
2365  *
2366  * Removes a filter.
2367  *
2368  * Since: 2.26
2369  */
2370 void
2371 g_dbus_connection_remove_filter (GDBusConnection *connection,
2372                                  guint            filter_id)
2373 {
2374   guint n;
2375   FilterData *to_destroy;
2376
2377   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
2378
2379   CONNECTION_LOCK (connection);
2380   to_destroy = NULL;
2381   for (n = 0; n < connection->priv->filters->len; n++)
2382     {
2383       FilterData *data = connection->priv->filters->pdata[n];
2384       if (data->id == filter_id)
2385         {
2386           g_ptr_array_remove_index (connection->priv->filters, n);
2387           to_destroy = data;
2388           break;
2389         }
2390     }
2391   CONNECTION_UNLOCK (connection);
2392
2393   /* do free without holding lock */
2394   if (to_destroy != NULL)
2395     {
2396       if (to_destroy->user_data_free_func != NULL)
2397         to_destroy->user_data_free_func (to_destroy->user_data);
2398       g_free (to_destroy);
2399     }
2400   else
2401     {
2402       g_warning ("g_dbus_connection_remove_filter: No filter found for filter_id %d", filter_id);
2403     }
2404 }
2405
2406 /* ---------------------------------------------------------------------------------------------------- */
2407
2408 typedef struct
2409 {
2410   gchar *rule;
2411   gchar *sender;
2412   gchar *interface_name;
2413   gchar *member;
2414   gchar *object_path;
2415   gchar *arg0;
2416   GArray *subscribers;
2417 } SignalData;
2418
2419 typedef struct
2420 {
2421   GDBusSignalCallback callback;
2422   gpointer user_data;
2423   GDestroyNotify user_data_free_func;
2424   guint id;
2425   GMainContext *context;
2426 } SignalSubscriber;
2427
2428 static void
2429 signal_data_free (SignalData *data)
2430 {
2431   g_free (data->rule);
2432   g_free (data->sender);
2433   g_free (data->interface_name);
2434   g_free (data->member);
2435   g_free (data->object_path);
2436   g_free (data->arg0);
2437   g_array_free (data->subscribers, TRUE);
2438   g_free (data);
2439 }
2440
2441 static gchar *
2442 args_to_rule (const gchar *sender,
2443               const gchar *interface_name,
2444               const gchar *member,
2445               const gchar *object_path,
2446               const gchar *arg0)
2447 {
2448   GString *rule;
2449
2450   rule = g_string_new ("type='signal'");
2451   if (sender != NULL)
2452     g_string_append_printf (rule, ",sender='%s'", sender);
2453   if (interface_name != NULL)
2454     g_string_append_printf (rule, ",interface='%s'", interface_name);
2455   if (member != NULL)
2456     g_string_append_printf (rule, ",member='%s'", member);
2457   if (object_path != NULL)
2458     g_string_append_printf (rule, ",path='%s'", object_path);
2459   if (arg0 != NULL)
2460     g_string_append_printf (rule, ",arg0='%s'", arg0);
2461
2462   return g_string_free (rule, FALSE);
2463 }
2464
2465 static guint _global_subscriber_id = 1;
2466 static guint _global_registration_id = 1;
2467 static guint _global_subtree_registration_id = 1;
2468
2469 /* ---------------------------------------------------------------------------------------------------- */
2470
2471 /* must hold lock when calling */
2472 static void
2473 add_match_rule (GDBusConnection *connection,
2474                 const gchar     *match_rule)
2475 {
2476   GError *error;
2477   GDBusMessage *message;
2478
2479   message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
2480                                             "/org/freedesktop/DBus", /* path */
2481                                             "org.freedesktop.DBus", /* interface */
2482                                             "AddMatch");
2483   g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
2484
2485   error = NULL;
2486   if (!g_dbus_connection_send_message_unlocked (connection,
2487                                                 message,
2488                                                 NULL,
2489                                                 &error))
2490     {
2491       g_critical ("Error while sending AddMatch() message: %s", error->message);
2492       g_error_free (error);
2493     }
2494   g_object_unref (message);
2495 }
2496
2497 /* ---------------------------------------------------------------------------------------------------- */
2498
2499 /* must hold lock when calling */
2500 static void
2501 remove_match_rule (GDBusConnection *connection,
2502                    const gchar     *match_rule)
2503 {
2504   GError *error;
2505   GDBusMessage *message;
2506
2507   message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
2508                                             "/org/freedesktop/DBus", /* path */
2509                                             "org.freedesktop.DBus", /* interface */
2510                                             "RemoveMatch");
2511   g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
2512
2513   error = NULL;
2514   if (!g_dbus_connection_send_message_unlocked (connection,
2515                                                 message,
2516                                                 NULL,
2517                                                 &error))
2518     {
2519       g_critical ("Error while sending RemoveMatch() message: %s", error->message);
2520       g_error_free (error);
2521     }
2522   g_object_unref (message);
2523 }
2524
2525 /* ---------------------------------------------------------------------------------------------------- */
2526
2527 static gboolean
2528 is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
2529 {
2530   return g_strcmp0 (signal_data->sender, "org.freedesktop.DBus") == 0 &&
2531          g_strcmp0 (signal_data->interface_name, "org.freedesktop.DBus") == 0 &&
2532          g_strcmp0 (signal_data->object_path, "/org/freedesktop/DBus") == 0 &&
2533          (g_strcmp0 (signal_data->member, "NameLost") == 0 ||
2534           g_strcmp0 (signal_data->member, "NameAcquired") == 0);
2535 }
2536
2537 /* ---------------------------------------------------------------------------------------------------- */
2538
2539 /**
2540  * g_dbus_connection_signal_subscribe:
2541  * @connection: A #GDBusConnection.
2542  * @sender: Sender name to match on. Must be either <literal>org.freedesktop.DBus</literal> (for listening to signals from the message bus daemon) or a unique name or %NULL to listen from all senders.
2543  * @interface_name: D-Bus interface name to match on or %NULL to match on all interfaces.
2544  * @member: D-Bus signal name to match on or %NULL to match on all signals.
2545  * @object_path: Object path to match on or %NULL to match on all object paths.
2546  * @arg0: Contents of first string argument to match on or %NULL to match on all kinds of arguments.
2547  * @callback: Callback to invoke when there is a signal matching the requested data.
2548  * @user_data: User data to pass to @callback.
2549  * @user_data_free_func: Function to free @user_data with when subscription is removed or %NULL.
2550  *
2551  * Subscribes to signals on @connection and invokes @callback with a
2552  * whenever the signal is received. Note that @callback
2553  * will be invoked in the <link
2554  * linkend="g-main-context-push-thread-default">thread-default main
2555  * loop</link> of the thread you are calling this method from.
2556  *
2557  * It is considered a programming error to use this function if @connection is closed.
2558  *
2559  * Note that if @sender is not <literal>org.freedesktop.DBus</literal> (for listening to signals from the
2560  * message bus daemon), then it needs to be a unique bus name or %NULL (for listening to signals from any
2561  * name) - you cannot pass a name like <literal>com.example.MyApp</literal>.
2562  * Use e.g. g_bus_watch_name() to find the unique name for the owner of the name you are interested in. Also note
2563  * that this function does not remove a subscription if @sender vanishes from the bus. You have to manually
2564  * call g_dbus_connection_signal_unsubscribe() to remove a subscription.
2565  *
2566  * Returns: A subscription identifier that can be used with g_dbus_connection_signal_unsubscribe().
2567  *
2568  * Since: 2.26
2569  */
2570 guint
2571 g_dbus_connection_signal_subscribe (GDBusConnection     *connection,
2572                                     const gchar         *sender,
2573                                     const gchar         *interface_name,
2574                                     const gchar         *member,
2575                                     const gchar         *object_path,
2576                                     const gchar         *arg0,
2577                                     GDBusSignalCallback  callback,
2578                                     gpointer             user_data,
2579                                     GDestroyNotify       user_data_free_func)
2580 {
2581   gchar *rule;
2582   SignalData *signal_data;
2583   SignalSubscriber subscriber;
2584   GPtrArray *signal_data_array;
2585
2586   /* Right now we abort if AddMatch() fails since it can only fail with the bus being in
2587    * an OOM condition. We might want to change that but that would involve making
2588    * g_dbus_connection_signal_subscribe() asynchronous and having the call sites
2589    * handle that. And there's really no sensible way of handling this short of retrying
2590    * to add the match rule... and then there's the little thing that, hey, maybe there's
2591    * a reason the bus in an OOM condition.
2592    *
2593    * Doable, but not really sure it's worth it...
2594    */
2595
2596   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
2597   g_return_val_if_fail (!g_dbus_connection_is_closed (connection), 0);
2598   g_return_val_if_fail (sender == NULL || ((strcmp (sender, "org.freedesktop.DBus") == 0 || sender[0] == ':') &&
2599                                            (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)), 0);
2600   g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), 0);
2601   g_return_val_if_fail (member == NULL || g_dbus_is_member_name (member), 0);
2602   g_return_val_if_fail (object_path == NULL || g_variant_is_object_path (object_path), 0);
2603   g_return_val_if_fail (callback != NULL, 0);
2604
2605   CONNECTION_LOCK (connection);
2606
2607   rule = args_to_rule (sender, interface_name, member, object_path, arg0);
2608
2609   if (sender == NULL)
2610     sender = "";
2611
2612   subscriber.callback = callback;
2613   subscriber.user_data = user_data;
2614   subscriber.user_data_free_func = user_data_free_func;
2615   subscriber.id = _global_subscriber_id++; /* TODO: overflow etc. */
2616   subscriber.context = g_main_context_get_thread_default ();
2617   if (subscriber.context != NULL)
2618     g_main_context_ref (subscriber.context);
2619
2620   /* see if we've already have this rule */
2621   signal_data = g_hash_table_lookup (connection->priv->map_rule_to_signal_data, rule);
2622   if (signal_data != NULL)
2623     {
2624       g_array_append_val (signal_data->subscribers, subscriber);
2625       g_free (rule);
2626       goto out;
2627     }
2628
2629   signal_data = g_new0 (SignalData, 1);
2630   signal_data->rule           = rule;
2631   signal_data->sender         = g_strdup (sender);
2632   signal_data->interface_name = g_strdup (interface_name);
2633   signal_data->member         = g_strdup (member);
2634   signal_data->object_path    = g_strdup (object_path);
2635   signal_data->arg0           = g_strdup (arg0);
2636   signal_data->subscribers    = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
2637   g_array_append_val (signal_data->subscribers, subscriber);
2638
2639   g_hash_table_insert (connection->priv->map_rule_to_signal_data,
2640                        signal_data->rule,
2641                        signal_data);
2642
2643   /* Add the match rule to the bus...
2644    *
2645    * Avoid adding match rules for NameLost and NameAcquired messages - the bus will
2646    * always send such messages to us.
2647    */
2648   if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
2649     {
2650       if (!is_signal_data_for_name_lost_or_acquired (signal_data))
2651         add_match_rule (connection, signal_data->rule);
2652     }
2653
2654  out:
2655   g_hash_table_insert (connection->priv->map_id_to_signal_data,
2656                        GUINT_TO_POINTER (subscriber.id),
2657                        signal_data);
2658
2659   signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
2660                                            signal_data->sender);
2661   if (signal_data_array == NULL)
2662     {
2663       signal_data_array = g_ptr_array_new ();
2664       g_hash_table_insert (connection->priv->map_sender_to_signal_data_array,
2665                            g_strdup (signal_data->sender),
2666                            signal_data_array);
2667     }
2668   g_ptr_array_add (signal_data_array, signal_data);
2669
2670   CONNECTION_UNLOCK (connection);
2671
2672   return subscriber.id;
2673 }
2674
2675 /* ---------------------------------------------------------------------------------------------------- */
2676
2677 /* must hold lock when calling this */
2678 static void
2679 unsubscribe_id_internal (GDBusConnection *connection,
2680                          guint            subscription_id,
2681                          GArray          *out_removed_subscribers)
2682 {
2683   SignalData *signal_data;
2684   GPtrArray *signal_data_array;
2685   guint n;
2686
2687   signal_data = g_hash_table_lookup (connection->priv->map_id_to_signal_data,
2688                                      GUINT_TO_POINTER (subscription_id));
2689   if (signal_data == NULL)
2690     {
2691       /* Don't warn here, we may have thrown all subscriptions out when the connection was closed */
2692       goto out;
2693     }
2694
2695   for (n = 0; n < signal_data->subscribers->len; n++)
2696     {
2697       SignalSubscriber *subscriber;
2698
2699       subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, n));
2700       if (subscriber->id != subscription_id)
2701         continue;
2702
2703       g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_signal_data,
2704                                            GUINT_TO_POINTER (subscription_id)));
2705       g_array_append_val (out_removed_subscribers, *subscriber);
2706       g_array_remove_index (signal_data->subscribers, n);
2707
2708       if (signal_data->subscribers->len == 0)
2709         g_warn_if_fail (g_hash_table_remove (connection->priv->map_rule_to_signal_data, signal_data->rule));
2710
2711       signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
2712                                                signal_data->sender);
2713       g_warn_if_fail (signal_data_array != NULL);
2714       g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));
2715
2716       if (signal_data_array->len == 0)
2717         {
2718           g_warn_if_fail (g_hash_table_remove (connection->priv->map_sender_to_signal_data_array, signal_data->sender));
2719
2720           /* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
2721           if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
2722             {
2723               if (!is_signal_data_for_name_lost_or_acquired (signal_data))
2724                 remove_match_rule (connection, signal_data->rule);
2725             }
2726
2727           signal_data_free (signal_data);
2728         }
2729
2730       goto out;
2731     }
2732
2733   g_assert_not_reached ();
2734
2735  out:
2736   ;
2737 }
2738
2739 /**
2740  * g_dbus_connection_signal_unsubscribe:
2741  * @connection: A #GDBusConnection.
2742  * @subscription_id: A subscription id obtained from g_dbus_connection_signal_subscribe().
2743  *
2744  * Unsubscribes from signals.
2745  *
2746  * Since: 2.26
2747  */
2748 void
2749 g_dbus_connection_signal_unsubscribe (GDBusConnection *connection,
2750                                       guint            subscription_id)
2751 {
2752   GArray *subscribers;
2753   guint n;
2754
2755   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
2756
2757   subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
2758
2759   CONNECTION_LOCK (connection);
2760   unsubscribe_id_internal (connection,
2761                            subscription_id,
2762                            subscribers);
2763   CONNECTION_UNLOCK (connection);
2764
2765   /* invariant */
2766   g_assert (subscribers->len == 0 || subscribers->len == 1);
2767
2768   /* call GDestroyNotify without lock held */
2769   for (n = 0; n < subscribers->len; n++)
2770     {
2771       SignalSubscriber *subscriber;
2772       subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
2773       if (subscriber->user_data_free_func != NULL)
2774         subscriber->user_data_free_func (subscriber->user_data);
2775       if (subscriber->context != NULL)
2776         g_main_context_unref (subscriber->context);
2777     }
2778
2779   g_array_free (subscribers, TRUE);
2780 }
2781
2782 /* ---------------------------------------------------------------------------------------------------- */
2783
2784 typedef struct
2785 {
2786   guint                subscription_id;
2787   GDBusSignalCallback  callback;
2788   gpointer             user_data;
2789   GDBusMessage        *message;
2790   GDBusConnection     *connection;
2791   const gchar         *sender;
2792   const gchar         *path;
2793   const gchar         *interface;
2794   const gchar         *member;
2795 } SignalInstance;
2796
2797 /* called on delivery thread (e.g. where g_dbus_connection_signal_subscribe() was called) with
2798  * no locks held
2799  */
2800 static gboolean
2801 emit_signal_instance_in_idle_cb (gpointer data)
2802 {
2803   SignalInstance *signal_instance = data;
2804   GVariant *parameters;
2805   gboolean has_subscription;
2806
2807   parameters = g_dbus_message_get_body (signal_instance->message);
2808   if (parameters == NULL)
2809     {
2810       parameters = g_variant_new ("()");
2811       g_variant_ref_sink (parameters);
2812     }
2813   else
2814     {
2815       g_variant_ref_sink (parameters);
2816     }
2817
2818 #if 0
2819   g_debug ("in emit_signal_instance_in_idle_cb (sender=%s path=%s interface=%s member=%s params=%s)",
2820            signal_instance->sender,
2821            signal_instance->path,
2822            signal_instance->interface,
2823            signal_instance->member,
2824            g_variant_print (parameters, TRUE));
2825 #endif
2826
2827   /* Careful here, don't do the callback if we no longer has the subscription */
2828   CONNECTION_LOCK (signal_instance->connection);
2829   has_subscription = FALSE;
2830   if (g_hash_table_lookup (signal_instance->connection->priv->map_id_to_signal_data,
2831                            GUINT_TO_POINTER (signal_instance->subscription_id)) != NULL)
2832     has_subscription = TRUE;
2833   CONNECTION_UNLOCK (signal_instance->connection);
2834
2835   if (has_subscription)
2836     signal_instance->callback (signal_instance->connection,
2837                                signal_instance->sender,
2838                                signal_instance->path,
2839                                signal_instance->interface,
2840                                signal_instance->member,
2841                                parameters,
2842                                signal_instance->user_data);
2843
2844   if (parameters != NULL)
2845     g_variant_unref (parameters);
2846
2847   return FALSE;
2848 }
2849
2850 static void
2851 signal_instance_free (SignalInstance *signal_instance)
2852 {
2853   g_object_unref (signal_instance->message);
2854   g_object_unref (signal_instance->connection);
2855   g_free (signal_instance);
2856 }
2857
2858 /* called in message handler thread WITH lock held */
2859 static void
2860 schedule_callbacks (GDBusConnection *connection,
2861                     GPtrArray       *signal_data_array,
2862                     GDBusMessage    *message,
2863                     const gchar     *sender)
2864 {
2865   guint n, m;
2866   const gchar *interface;
2867   const gchar *member;
2868   const gchar *path;
2869   const gchar *arg0;
2870
2871   interface = NULL;
2872   member = NULL;
2873   path = NULL;
2874   arg0 = NULL;
2875
2876   interface = g_dbus_message_get_interface (message);
2877   member = g_dbus_message_get_member (message);
2878   path = g_dbus_message_get_path (message);
2879   arg0 = g_dbus_message_get_arg0 (message);
2880
2881 #if 0
2882   g_debug ("sender    = `%s'", sender);
2883   g_debug ("interface = `%s'", interface);
2884   g_debug ("member    = `%s'", member);
2885   g_debug ("path      = `%s'", path);
2886   g_debug ("arg0      = `%s'", arg0);
2887 #endif
2888
2889   /* TODO: if this is slow, then we can change signal_data_array into
2890    *       map_object_path_to_signal_data_array or something.
2891    */
2892   for (n = 0; n < signal_data_array->len; n++)
2893     {
2894       SignalData *signal_data = signal_data_array->pdata[n];
2895
2896       if (signal_data->interface_name != NULL && g_strcmp0 (signal_data->interface_name, interface) != 0)
2897         continue;
2898
2899       if (signal_data->member != NULL && g_strcmp0 (signal_data->member, member) != 0)
2900         continue;
2901
2902       if (signal_data->object_path != NULL && g_strcmp0 (signal_data->object_path, path) != 0)
2903         continue;
2904
2905       if (signal_data->arg0 != NULL && g_strcmp0 (signal_data->arg0, arg0) != 0)
2906         continue;
2907
2908       for (m = 0; m < signal_data->subscribers->len; m++)
2909         {
2910           SignalSubscriber *subscriber;
2911           GSource *idle_source;
2912           SignalInstance *signal_instance;
2913
2914           subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, m));
2915
2916           signal_instance = g_new0 (SignalInstance, 1);
2917           signal_instance->subscription_id = subscriber->id;
2918           signal_instance->callback = subscriber->callback;
2919           signal_instance->user_data = subscriber->user_data;
2920           signal_instance->message = g_object_ref (message);
2921           signal_instance->connection = g_object_ref (connection);
2922           signal_instance->sender = sender;
2923           signal_instance->path = path;
2924           signal_instance->interface = interface;
2925           signal_instance->member = member;
2926
2927           idle_source = g_idle_source_new ();
2928           g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
2929           g_source_set_callback (idle_source,
2930                                  emit_signal_instance_in_idle_cb,
2931                                  signal_instance,
2932                                  (GDestroyNotify) signal_instance_free);
2933           g_source_attach (idle_source, subscriber->context);
2934           g_source_unref (idle_source);
2935         }
2936     }
2937 }
2938
2939 /* called in message handler thread with lock held */
2940 static void
2941 distribute_signals (GDBusConnection *connection,
2942                     GDBusMessage    *message)
2943 {
2944   GPtrArray *signal_data_array;
2945   const gchar *sender;
2946
2947   sender = g_dbus_message_get_sender (message);
2948
2949   /* collect subscribers that match on sender */
2950   if (sender != NULL)
2951     {
2952       signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array, sender);
2953       if (signal_data_array != NULL)
2954         schedule_callbacks (connection, signal_data_array, message, sender);
2955     }
2956
2957   /* collect subscribers not matching on sender */
2958   signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array, "");
2959   if (signal_data_array != NULL)
2960     schedule_callbacks (connection, signal_data_array, message, sender);
2961 }
2962
2963 /* ---------------------------------------------------------------------------------------------------- */
2964
2965 /* only called from finalize(), removes all subscriptions */
2966 static void
2967 purge_all_signal_subscriptions (GDBusConnection *connection)
2968 {
2969   GHashTableIter iter;
2970   gpointer key;
2971   GArray *ids;
2972   GArray *subscribers;
2973   guint n;
2974
2975   ids = g_array_new (FALSE, FALSE, sizeof (guint));
2976   g_hash_table_iter_init (&iter, connection->priv->map_id_to_signal_data);
2977   while (g_hash_table_iter_next (&iter, &key, NULL))
2978     {
2979       guint subscription_id = GPOINTER_TO_UINT (key);
2980       g_array_append_val (ids, subscription_id);
2981     }
2982
2983   subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
2984   for (n = 0; n < ids->len; n++)
2985     {
2986       guint subscription_id = g_array_index (ids, guint, n);
2987       unsubscribe_id_internal (connection,
2988                                subscription_id,
2989                                subscribers);
2990     }
2991   g_array_free (ids, TRUE);
2992
2993   /* call GDestroyNotify without lock held */
2994   for (n = 0; n < subscribers->len; n++)
2995     {
2996       SignalSubscriber *subscriber;
2997       subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
2998       if (subscriber->user_data_free_func != NULL)
2999         subscriber->user_data_free_func (subscriber->user_data);
3000       if (subscriber->context != NULL)
3001         g_main_context_unref (subscriber->context);
3002     }
3003
3004   g_array_free (subscribers, TRUE);
3005 }
3006
3007 /* ---------------------------------------------------------------------------------------------------- */
3008
3009 struct ExportedObject
3010 {
3011   gchar *object_path;
3012   GDBusConnection *connection;
3013
3014   /* maps gchar* -> ExportedInterface* */
3015   GHashTable *map_if_name_to_ei;
3016 };
3017
3018 /* only called with lock held */
3019 static void
3020 exported_object_free (ExportedObject *eo)
3021 {
3022   g_free (eo->object_path);
3023   g_hash_table_unref (eo->map_if_name_to_ei);
3024   g_free (eo);
3025 }
3026
3027 typedef struct
3028 {
3029   ExportedObject *eo;
3030
3031   guint                       id;
3032   gchar                      *interface_name;
3033   const GDBusInterfaceVTable *vtable;
3034   const GDBusInterfaceInfo   *introspection_data;
3035
3036   GMainContext               *context;
3037   gpointer                    user_data;
3038   GDestroyNotify              user_data_free_func;
3039 } ExportedInterface;
3040
3041 /* called with lock held */
3042 static void
3043 exported_interface_free (ExportedInterface *ei)
3044 {
3045   if (ei->user_data_free_func != NULL)
3046     /* TODO: push to thread-default mainloop */
3047     ei->user_data_free_func (ei->user_data);
3048
3049   if (ei->context != NULL)
3050     g_main_context_unref (ei->context);
3051
3052   g_free (ei->interface_name);
3053   g_free (ei);
3054 }
3055
3056 /* ---------------------------------------------------------------------------------------------------- */
3057
3058 typedef struct
3059 {
3060   GDBusConnection *connection;
3061   GDBusMessage *message;
3062   gpointer user_data;
3063   const char *property_name;
3064   const GDBusInterfaceVTable *vtable;
3065   const GDBusInterfaceInfo *interface_info;
3066   const GDBusPropertyInfo *property_info;
3067 } PropertyData;
3068
3069 static void
3070 property_data_free (PropertyData *data)
3071 {
3072   g_object_unref (data->connection);
3073   g_object_unref (data->message);
3074   g_free (data);
3075 }
3076
3077 /* called in thread where object was registered - no locks held */
3078 static gboolean
3079 invoke_get_property_in_idle_cb (gpointer _data)
3080 {
3081   PropertyData *data = _data;
3082   GVariant *value;
3083   GError *error;
3084   GDBusMessage *reply;
3085
3086   error = NULL;
3087   value = data->vtable->get_property (data->connection,
3088                                       g_dbus_message_get_sender (data->message),
3089                                       g_dbus_message_get_path (data->message),
3090                                       data->interface_info->name,
3091                                       data->property_name,
3092                                       &error,
3093                                       data->user_data);
3094
3095
3096   if (value != NULL)
3097     {
3098       g_assert_no_error (error);
3099
3100       g_variant_ref_sink (value);
3101       reply = g_dbus_message_new_method_reply (data->message);
3102       g_dbus_message_set_body (reply, g_variant_new ("(v)", value));
3103       g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
3104       g_variant_unref (value);
3105       g_object_unref (reply);
3106     }
3107   else
3108     {
3109       gchar *dbus_error_name;
3110
3111       g_assert (error != NULL);
3112
3113       dbus_error_name = g_dbus_error_encode_gerror (error);
3114       reply = g_dbus_message_new_method_error_literal (data->message,
3115                                                        dbus_error_name,
3116                                                        error->message);
3117       g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
3118       g_free (dbus_error_name);
3119       g_error_free (error);
3120       g_object_unref (reply);
3121     }
3122
3123   return FALSE;
3124 }
3125
3126 /* called in thread where object was registered - no locks held */
3127 static gboolean
3128 invoke_set_property_in_idle_cb (gpointer _data)
3129 {
3130   PropertyData *data = _data;
3131   GError *error;
3132   GDBusMessage *reply;
3133   GVariant *value;
3134
3135   error = NULL;
3136   value = NULL;
3137
3138   g_variant_get (g_dbus_message_get_body (data->message),
3139                  "(ssv)",
3140                  NULL,
3141                  NULL,
3142                  &value);
3143
3144   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if the type
3145    * of the given value is wrong
3146    */
3147   if (g_strcmp0 (g_variant_get_type_string (value), data->property_info->signature) != 0)
3148     {
3149       reply = g_dbus_message_new_method_error (data->message,
3150                                                "org.freedesktop.DBus.Error.InvalidArgs",
3151                                                _("Error setting property `%s': Expected type `%s' but got `%s'"),
3152                                                data->property_info->name,
3153                                                data->property_info->signature,
3154                                                g_variant_get_type_string (value));
3155       goto out;
3156     }
3157
3158   if (!data->vtable->set_property (data->connection,
3159                                    g_dbus_message_get_sender (data->message),
3160                                    g_dbus_message_get_path (data->message),
3161                                    data->interface_info->name,
3162                                    data->property_name,
3163                                    value,
3164                                    &error,
3165                                    data->user_data))
3166     {
3167       gchar *dbus_error_name;
3168       g_assert (error != NULL);
3169       dbus_error_name = g_dbus_error_encode_gerror (error);
3170       reply = g_dbus_message_new_method_error_literal (data->message,
3171                                                        dbus_error_name,
3172                                                        error->message);
3173       g_free (dbus_error_name);
3174       g_error_free (error);
3175     }
3176   else
3177     {
3178       reply = g_dbus_message_new_method_reply (data->message);
3179     }
3180
3181  out:
3182   g_assert (reply != NULL);
3183   g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
3184   g_object_unref (reply);
3185
3186   return FALSE;
3187 }
3188
3189 /* called with lock held */
3190 static gboolean
3191 validate_and_maybe_schedule_property_getset (GDBusConnection            *connection,
3192                                              GDBusMessage               *message,
3193                                              gboolean                    is_get,
3194                                              const GDBusInterfaceInfo   *introspection_data,
3195                                              const GDBusInterfaceVTable *vtable,
3196                                              GMainContext               *main_context,
3197                                              gpointer                    user_data)
3198 {
3199   gboolean handled;
3200   const char *interface_name;
3201   const char *property_name;
3202   const GDBusPropertyInfo *property_info;
3203   GSource *idle_source;
3204   PropertyData *property_data;
3205   GDBusMessage *reply;
3206
3207   handled = FALSE;
3208
3209   if (is_get)
3210     g_variant_get (g_dbus_message_get_body (message),
3211                    "(ss)",
3212                    &interface_name,
3213                    &property_name);
3214   else
3215     g_variant_get (g_dbus_message_get_body (message),
3216                    "(ssv)",
3217                    &interface_name,
3218                    &property_name,
3219                    NULL);
3220
3221
3222   if (is_get)
3223     {
3224       if (vtable == NULL || vtable->get_property == NULL)
3225         goto out;
3226     }
3227   else
3228     {
3229       if (vtable == NULL || vtable->set_property == NULL)
3230         goto out;
3231     }
3232
3233   /* Check that the property exists - if not fail with org.freedesktop.DBus.Error.InvalidArgs
3234    */
3235   property_info = NULL;
3236
3237   /* TODO: the cost of this is O(n) - it might be worth caching the result */
3238   property_info = g_dbus_interface_info_lookup_property (introspection_data, property_name);
3239   if (property_info == NULL)
3240     {
3241       reply = g_dbus_message_new_method_error (message,
3242                                                "org.freedesktop.DBus.Error.InvalidArgs",
3243                                                _("No such property `%s'"),
3244                                                property_name);
3245       g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3246       g_object_unref (reply);
3247       handled = TRUE;
3248       goto out;
3249     }
3250
3251   if (is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
3252     {
3253       reply = g_dbus_message_new_method_error (message,
3254                                                "org.freedesktop.DBus.Error.InvalidArgs",
3255                                                _("Property `%s' is not readable"),
3256                                                property_name);
3257       g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3258       g_object_unref (reply);
3259       handled = TRUE;
3260       goto out;
3261     }
3262   else if (!is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE))
3263     {
3264       reply = g_dbus_message_new_method_error (message,
3265                                                "org.freedesktop.DBus.Error.InvalidArgs",
3266                                                _("Property `%s' is not writable"),
3267                                                property_name);
3268       g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3269       g_object_unref (reply);
3270       handled = TRUE;
3271       goto out;
3272     }
3273
3274   /* ok, got the property info - call user code in an idle handler */
3275   property_data = g_new0 (PropertyData, 1);
3276   property_data->connection = g_object_ref (connection);
3277   property_data->message = g_object_ref (message);
3278   property_data->user_data = user_data;
3279   property_data->property_name = property_name;
3280   property_data->vtable = vtable;
3281   property_data->interface_info = introspection_data;
3282   property_data->property_info = property_info;
3283
3284   idle_source = g_idle_source_new ();
3285   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
3286   g_source_set_callback (idle_source,
3287                          is_get ? invoke_get_property_in_idle_cb : invoke_set_property_in_idle_cb,
3288                          property_data,
3289                          (GDestroyNotify) property_data_free);
3290   g_source_attach (idle_source, main_context);
3291   g_source_unref (idle_source);
3292
3293   handled = TRUE;
3294
3295  out:
3296   return handled;
3297 }
3298
3299 /* called with lock held */
3300 static gboolean
3301 handle_getset_property (GDBusConnection *connection,
3302                         ExportedObject  *eo,
3303                         GDBusMessage    *message,
3304                         gboolean         is_get)
3305 {
3306   ExportedInterface *ei;
3307   gboolean handled;
3308   const char *interface_name;
3309   const char *property_name;
3310
3311   handled = FALSE;
3312
3313   if (is_get)
3314     g_variant_get (g_dbus_message_get_body (message),
3315                    "(ss)",
3316                    &interface_name,
3317                    &property_name);
3318   else
3319     g_variant_get (g_dbus_message_get_body (message),
3320                    "(ssv)",
3321                    &interface_name,
3322                    &property_name,
3323                    NULL);
3324
3325   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
3326    * no such interface registered
3327    */
3328   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
3329   if (ei == NULL)
3330     {
3331       GDBusMessage *reply;
3332       reply = g_dbus_message_new_method_error (message,
3333                                                "org.freedesktop.DBus.Error.InvalidArgs",
3334                                                _("No such interface `%s'"),
3335                                                interface_name);
3336       g_dbus_connection_send_message_unlocked (eo->connection, reply, NULL, NULL);
3337       g_object_unref (reply);
3338       handled = TRUE;
3339       goto out;
3340     }
3341
3342   handled = validate_and_maybe_schedule_property_getset (eo->connection,
3343                                                          message,
3344                                                          is_get,
3345                                                          ei->introspection_data,
3346                                                          ei->vtable,
3347                                                          ei->context,
3348                                                          ei->user_data);
3349  out:
3350   return handled;
3351 }
3352
3353 /* ---------------------------------------------------------------------------------------------------- */
3354
3355 typedef struct
3356 {
3357   GDBusConnection *connection;
3358   GDBusMessage *message;
3359   gpointer user_data;
3360   const GDBusInterfaceVTable *vtable;
3361   const GDBusInterfaceInfo *interface_info;
3362 } PropertyGetAllData;
3363
3364 static void
3365 property_get_all_data_free (PropertyData *data)
3366 {
3367   g_object_unref (data->connection);
3368   g_object_unref (data->message);
3369   g_free (data);
3370 }
3371
3372 /* called in thread where object was registered - no locks held */
3373 static gboolean
3374 invoke_get_all_properties_in_idle_cb (gpointer _data)
3375 {
3376   PropertyGetAllData *data = _data;
3377   GVariantBuilder *builder;
3378   GVariant *packed;
3379   GVariant *result;
3380   GError *error;
3381   GDBusMessage *reply;
3382   guint n;
3383
3384   error = NULL;
3385
3386   /* TODO: Right now we never fail this call - we just omit values if
3387    *       a get_property() call is failing.
3388    *
3389    *       We could fail the whole call if just a single get_property() call
3390    *       returns an error. We need clarification in the D-Bus spec about this.
3391    */
3392   builder = g_variant_builder_new (G_VARIANT_TYPE_ARRAY);
3393   for (n = 0; data->interface_info->properties != NULL && data->interface_info->properties[n] != NULL; n++)
3394     {
3395       const GDBusPropertyInfo *property_info = data->interface_info->properties[n];
3396       GVariant *value;
3397
3398       if (!(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
3399         continue;
3400
3401       value = data->vtable->get_property (data->connection,
3402                                           g_dbus_message_get_sender (data->message),
3403                                           g_dbus_message_get_path (data->message),
3404                                           data->interface_info->name,
3405                                           property_info->name,
3406                                           NULL,
3407                                           data->user_data);
3408
3409       if (value == NULL)
3410         continue;
3411
3412       g_variant_ref_sink (value);
3413       g_variant_builder_add (builder,
3414                              "{sv}",
3415                              property_info->name,
3416                              value);
3417       g_variant_unref (value);
3418     }
3419   result = g_variant_builder_end (builder);
3420
3421   builder = g_variant_builder_new (G_VARIANT_TYPE_TUPLE);
3422   g_variant_builder_add_value (builder, result); /* steals result since result is floating */
3423   packed = g_variant_builder_end (builder);
3424
3425   reply = g_dbus_message_new_method_reply (data->message);
3426   g_dbus_message_set_body (reply, packed);
3427   g_dbus_connection_send_message (data->connection, reply, NULL, NULL);
3428   g_object_unref (reply);
3429
3430   return FALSE;
3431 }
3432
3433 /* called with lock held */
3434 static gboolean
3435 validate_and_maybe_schedule_property_get_all (GDBusConnection            *connection,
3436                                               GDBusMessage               *message,
3437                                               const GDBusInterfaceInfo   *introspection_data,
3438                                               const GDBusInterfaceVTable *vtable,
3439                                               GMainContext               *main_context,
3440                                               gpointer                    user_data)
3441 {
3442   gboolean handled;
3443   const char *interface_name;
3444   GSource *idle_source;
3445   PropertyGetAllData *property_get_all_data;
3446
3447   handled = FALSE;
3448
3449   g_variant_get (g_dbus_message_get_body (message),
3450                  "(s)",
3451                  &interface_name);
3452
3453   if (vtable == NULL || vtable->get_property == NULL)
3454     goto out;
3455
3456   /* ok, got the property info - call user in an idle handler */
3457   property_get_all_data = g_new0 (PropertyGetAllData, 1);
3458   property_get_all_data->connection = g_object_ref (connection);
3459   property_get_all_data->message = g_object_ref (message);
3460   property_get_all_data->user_data = user_data;
3461   property_get_all_data->vtable = vtable;
3462   property_get_all_data->interface_info = introspection_data;
3463
3464   idle_source = g_idle_source_new ();
3465   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
3466   g_source_set_callback (idle_source,
3467                          invoke_get_all_properties_in_idle_cb,
3468                          property_get_all_data,
3469                          (GDestroyNotify) property_get_all_data_free);
3470   g_source_attach (idle_source, main_context);
3471   g_source_unref (idle_source);
3472
3473   handled = TRUE;
3474
3475  out:
3476   return handled;
3477 }
3478
3479 /* called with lock held */
3480 static gboolean
3481 handle_get_all_properties (GDBusConnection *connection,
3482                            ExportedObject  *eo,
3483                            GDBusMessage    *message)
3484 {
3485   ExportedInterface *ei;
3486   gboolean handled;
3487   const char *interface_name;
3488
3489   handled = FALSE;
3490
3491   g_variant_get (g_dbus_message_get_body (message),
3492                  "(s)",
3493                  &interface_name);
3494
3495   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
3496    * no such interface registered
3497    */
3498   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
3499   if (ei == NULL)
3500     {
3501       GDBusMessage *reply;
3502       reply = g_dbus_message_new_method_error (message,
3503                                                "org.freedesktop.DBus.Error.InvalidArgs",
3504                                                _("No such interface"),
3505                                                interface_name);
3506       g_dbus_connection_send_message_unlocked (eo->connection, reply, NULL, NULL);
3507       g_object_unref (reply);
3508       handled = TRUE;
3509       goto out;
3510     }
3511
3512   handled = validate_and_maybe_schedule_property_get_all (eo->connection,
3513                                                           message,
3514                                                           ei->introspection_data,
3515                                                           ei->vtable,
3516                                                           ei->context,
3517                                                           ei->user_data);
3518  out:
3519   return handled;
3520 }
3521
3522 /* ---------------------------------------------------------------------------------------------------- */
3523
3524 static const gchar introspect_header[] =
3525   "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n"
3526   "                      \"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
3527   "<!-- GDBus " PACKAGE_VERSION " -->\n"
3528   "<node>\n";
3529
3530 static const gchar introspect_tail[] =
3531   "</node>\n";
3532
3533 static const gchar introspect_standard_interfaces[] =
3534   "  <interface name=\"org.freedesktop.DBus.Properties\">\n"
3535   "    <method name=\"Get\">\n"
3536   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
3537   "      <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
3538   "      <arg type=\"v\" name=\"value\" direction=\"out\"/>\n"
3539   "    </method>\n"
3540   "    <method name=\"GetAll\">\n"
3541   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
3542   "      <arg type=\"a{sv}\" name=\"properties\" direction=\"out\"/>\n"
3543   "    </method>\n"
3544   "    <method name=\"Set\">\n"
3545   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
3546   "      <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
3547   "      <arg type=\"v\" name=\"value\" direction=\"in\"/>\n"
3548   "    </method>\n"
3549   "    <signal name=\"PropertiesChanged\">\n"
3550   "      <arg type=\"s\" name=\"interface_name\"/>\n"
3551   "      <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
3552   "    </signal>\n"
3553   "  </interface>\n"
3554   "  <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
3555   "    <method name=\"Introspect\">\n"
3556   "      <arg type=\"s\" name=\"xml_data\" direction=\"out\"/>\n"
3557   "    </method>\n"
3558   "  </interface>\n"
3559   "  <interface name=\"org.freedesktop.DBus.Peer\">\n"
3560   "    <method name=\"Ping\"/>\n"
3561   "    <method name=\"GetMachineId\">\n"
3562   "      <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n"
3563   "    </method>\n"
3564   "  </interface>\n";
3565
3566 static void
3567 introspect_append_header (GString *s)
3568 {
3569   g_string_append (s, introspect_header);
3570 }
3571
3572 static void
3573 introspect_append_standard_interfaces (GString *s)
3574 {
3575   g_string_append (s, introspect_standard_interfaces);
3576 }
3577
3578 static void
3579 maybe_add_path (const gchar *path, gsize path_len, const gchar *object_path, GHashTable *set)
3580 {
3581   if (g_str_has_prefix (object_path, path) && strlen (object_path) >= path_len)
3582     {
3583       const gchar *begin;
3584       const gchar *end;
3585       gchar *s;
3586
3587       begin = object_path + path_len;
3588       end = strchr (begin, '/');
3589
3590       if (end != NULL)
3591         s = g_strndup (begin, end - begin);
3592       else
3593         s = g_strdup (begin);
3594
3595       if (g_hash_table_lookup (set, s) == NULL)
3596         g_hash_table_insert (set, s, GUINT_TO_POINTER (1));
3597       else
3598         g_free (s);
3599     }
3600 }
3601
3602 /* TODO: we want a nicer public interface for this */
3603 static gchar **
3604 g_dbus_connection_list_registered_unlocked (GDBusConnection *connection,
3605                                             const gchar     *path)
3606 {
3607   GPtrArray *p;
3608   gchar **ret;
3609   GHashTableIter hash_iter;
3610   const gchar *object_path;
3611   gsize path_len;
3612   GHashTable *set;
3613   GList *keys;
3614   GList *l;
3615
3616   CONNECTION_ENSURE_LOCK (connection);
3617
3618   path_len = strlen (path);
3619   if (path_len > 1)
3620     path_len++;
3621
3622   set = g_hash_table_new (g_str_hash, g_str_equal);
3623
3624   g_hash_table_iter_init (&hash_iter, connection->priv->map_object_path_to_eo);
3625   while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
3626     maybe_add_path (path, path_len, object_path, set);
3627
3628   g_hash_table_iter_init (&hash_iter, connection->priv->map_object_path_to_es);
3629   while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
3630     maybe_add_path (path, path_len, object_path, set);
3631
3632   p = g_ptr_array_new ();
3633   keys = g_hash_table_get_keys (set);
3634   for (l = keys; l != NULL; l = l->next)
3635     g_ptr_array_add (p, l->data);
3636   g_hash_table_unref (set);
3637   g_list_free (keys);
3638
3639   g_ptr_array_add (p, NULL);
3640   ret = (gchar **) g_ptr_array_free (p, FALSE);
3641   return ret;
3642 }
3643
3644 static gchar **
3645 g_dbus_connection_list_registered (GDBusConnection *connection,
3646                                    const gchar     *path)
3647 {
3648   gchar **ret;
3649   CONNECTION_LOCK (connection);
3650   ret = g_dbus_connection_list_registered_unlocked (connection, path);
3651   CONNECTION_UNLOCK (connection);
3652   return ret;
3653 }
3654
3655 /* called in message handler thread with lock held */
3656 static gboolean
3657 handle_introspect (GDBusConnection *connection,
3658                    ExportedObject  *eo,
3659                    GDBusMessage    *message)
3660 {
3661   guint n;
3662   GString *s;
3663   GDBusMessage *reply;
3664   GHashTableIter hash_iter;
3665   ExportedInterface *ei;
3666   gchar **registered;
3667
3668   /* first the header with the standard interfaces */
3669   s = g_string_sized_new (sizeof (introspect_header) +
3670                           sizeof (introspect_standard_interfaces) +
3671                           sizeof (introspect_tail));
3672   introspect_append_header (s);
3673   introspect_append_standard_interfaces (s);
3674
3675   /* then include the registered interfaces */
3676   g_hash_table_iter_init (&hash_iter, eo->map_if_name_to_ei);
3677   while (g_hash_table_iter_next (&hash_iter, NULL, (gpointer) &ei))
3678     g_dbus_interface_info_generate_xml (ei->introspection_data, 2, s);
3679
3680   /* finally include nodes registered below us */
3681   registered = g_dbus_connection_list_registered_unlocked (connection, eo->object_path);
3682   for (n = 0; registered != NULL && registered[n] != NULL; n++)
3683     g_string_append_printf (s, "  <node name=\"%s\"/>\n", registered[n]);
3684   g_strfreev (registered);
3685   g_string_append (s, introspect_tail);
3686
3687   reply = g_dbus_message_new_method_reply (message);
3688   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
3689   g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3690   g_object_unref (reply);
3691   g_string_free (s, TRUE);
3692
3693   return TRUE;
3694 }
3695
3696 /* called in thread where object was registered - no locks held */
3697 static gboolean
3698 call_in_idle_cb (gpointer user_data)
3699 {
3700   GDBusMethodInvocation *invocation = G_DBUS_METHOD_INVOCATION (user_data);
3701   GDBusInterfaceVTable *vtable;
3702
3703   vtable = g_object_get_data (G_OBJECT (invocation), "g-dbus-interface-vtable");
3704   g_assert (vtable != NULL && vtable->method_call != NULL);
3705
3706   vtable->method_call (g_dbus_method_invocation_get_connection (invocation),
3707                        g_dbus_method_invocation_get_sender (invocation),
3708                        g_dbus_method_invocation_get_object_path (invocation),
3709                        g_dbus_method_invocation_get_interface_name (invocation),
3710                        g_dbus_method_invocation_get_method_name (invocation),
3711                        g_dbus_method_invocation_get_parameters (invocation),
3712                        g_object_ref (invocation),
3713                        g_dbus_method_invocation_get_user_data (invocation));
3714
3715   return FALSE;
3716 }
3717
3718 /* called in message handler thread with lock held */
3719 static gboolean
3720 validate_and_maybe_schedule_method_call (GDBusConnection            *connection,
3721                                          GDBusMessage               *message,
3722                                          const GDBusInterfaceInfo   *introspection_data,
3723                                          const GDBusInterfaceVTable *vtable,
3724                                          GMainContext               *main_context,
3725                                          gpointer                    user_data)
3726 {
3727   GDBusMethodInvocation *invocation;
3728   const GDBusMethodInfo *method_info;
3729   GDBusMessage *reply;
3730   GVariant *parameters;
3731   GSource *idle_source;
3732   gboolean handled;
3733   gchar *in_signature;
3734
3735   handled = FALSE;
3736
3737   /* TODO: the cost of this is O(n) - it might be worth caching the result */
3738   method_info = g_dbus_interface_info_lookup_method (introspection_data, g_dbus_message_get_member (message));
3739
3740   /* if the method doesn't exist, return the org.freedesktop.DBus.Error.UnknownMethod
3741    * error to the caller
3742    */
3743   if (method_info == NULL)
3744     {
3745       reply = g_dbus_message_new_method_error (message,
3746                                                "org.freedesktop.DBus.Error.UnknownMethod",
3747                                                _("No such method `%s'"),
3748                                                g_dbus_message_get_member (message));
3749       g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3750       g_object_unref (reply);
3751       handled = TRUE;
3752       goto out;
3753     }
3754
3755   /* Check that the incoming args are of the right type - if they are not, return
3756    * the org.freedesktop.DBus.Error.InvalidArgs error to the caller
3757    *
3758    * TODO: might also be worth caching the combined signature.
3759    */
3760   in_signature = _g_dbus_compute_complete_signature (method_info->in_args, FALSE);
3761   if (g_strcmp0 (g_dbus_message_get_signature (message), in_signature) != 0)
3762     {
3763       reply = g_dbus_message_new_method_error (message,
3764                                                "org.freedesktop.DBus.Error.InvalidArgs",
3765                                                _("Signature of message, `%s', does not match expected signature `%s'"),
3766                                                g_dbus_message_get_signature (message),
3767                                                in_signature);
3768       g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
3769       g_object_unref (reply);
3770       g_free (in_signature);
3771       handled = TRUE;
3772       goto out;
3773     }
3774   g_free (in_signature);
3775
3776   parameters = g_dbus_message_get_body (message);
3777   if (parameters == NULL)
3778     {
3779       parameters = g_variant_new ("()");
3780       g_variant_ref_sink (parameters);
3781     }
3782   else
3783     {
3784       g_variant_ref (parameters);
3785     }
3786
3787   /* schedule the call in idle */
3788   invocation = g_dbus_method_invocation_new (g_dbus_message_get_sender (message),
3789                                              g_dbus_message_get_path (message),
3790                                              g_dbus_message_get_interface (message),
3791                                              g_dbus_message_get_member (message),
3792                                              method_info,
3793                                              connection,
3794                                              message,
3795                                              parameters,
3796                                              user_data);
3797   g_variant_unref (parameters);
3798   g_object_set_data (G_OBJECT (invocation),
3799                      "g-dbus-interface-vtable",
3800                      (gpointer) vtable);
3801
3802   idle_source = g_idle_source_new ();
3803   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
3804   g_source_set_callback (idle_source,
3805                          call_in_idle_cb,
3806                          invocation,
3807                          g_object_unref);
3808   g_source_attach (idle_source, main_context);
3809   g_source_unref (idle_source);
3810
3811   handled = TRUE;
3812
3813  out:
3814   return handled;
3815 }
3816
3817 /* ---------------------------------------------------------------------------------------------------- */
3818
3819 /* called in message handler thread with lock held */
3820 static gboolean
3821 obj_message_func (GDBusConnection *connection,
3822                   ExportedObject  *eo,
3823                   GDBusMessage    *message)
3824 {
3825   const gchar *interface_name;
3826   const gchar *member;
3827   const gchar *signature;
3828   gboolean handled;
3829
3830   handled = FALSE;
3831
3832   interface_name = g_dbus_message_get_interface (message);
3833   member = g_dbus_message_get_member (message);
3834   signature = g_dbus_message_get_signature (message);
3835
3836   /* see if we have an interface for handling this call */
3837   if (interface_name != NULL)
3838     {
3839       ExportedInterface *ei;
3840       ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
3841       if (ei != NULL)
3842         {
3843           /* we do - invoke the handler in idle in the right thread */
3844
3845           /* handle no vtable or handler being present */
3846           if (ei->vtable == NULL || ei->vtable->method_call == NULL)
3847             goto out;
3848
3849           handled = validate_and_maybe_schedule_method_call (connection,
3850                                                              message,
3851                                                              ei->introspection_data,
3852                                                              ei->vtable,
3853                                                              ei->context,
3854                                                              ei->user_data);
3855           goto out;
3856         }
3857     }
3858
3859   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
3860       g_strcmp0 (member, "Introspect") == 0 &&
3861       g_strcmp0 (signature, "") == 0)
3862     {
3863       handled = handle_introspect (connection, eo, message);
3864       goto out;
3865     }
3866   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
3867            g_strcmp0 (member, "Get") == 0 &&
3868            g_strcmp0 (signature, "ss") == 0)
3869     {
3870       handled = handle_getset_property (connection, eo, message, TRUE);
3871       goto out;
3872     }
3873   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
3874            g_strcmp0 (member, "Set") == 0 &&
3875            g_strcmp0 (signature, "ssv") == 0)
3876     {
3877       handled = handle_getset_property (connection, eo, message, FALSE);
3878       goto out;
3879     }
3880   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
3881            g_strcmp0 (member, "GetAll") == 0 &&
3882            g_strcmp0 (signature, "s") == 0)
3883     {
3884       handled = handle_get_all_properties (connection, eo, message);
3885       goto out;
3886     }
3887
3888  out:
3889   return handled;
3890 }
3891
3892 /**
3893  * g_dbus_connection_register_object:
3894  * @connection: A #GDBusConnection.
3895  * @object_path: The object path to register at.
3896  * @interface_name: The D-Bus interface to register.
3897  * @introspection_data: Introspection data for the interface.
3898  * @vtable: A #GDBusInterfaceVTable to call into or %NULL.
3899  * @user_data: Data to pass to functions in @vtable.
3900  * @user_data_free_func: Function to call when the object path is unregistered.
3901  * @error: Return location for error or %NULL.
3902  *
3903  * Registers callbacks for exported objects at @object_path with the
3904  * D-Bus interface @interface_name.
3905  *
3906  * Calls to functions in @vtable (and @user_data_free_func) will
3907  * happen in the <link linkend="g-main-context-push-thread-default">thread-default main
3908  * loop</link> of the thread you are calling this method from.
3909  *
3910  * Note that all #GVariant values passed to functions in @vtable will match
3911  * the signature given in @introspection_data - if a remote caller passes
3912  * incorrect values, the <literal>org.freedesktop.DBus.Error.InvalidArgs</literal>
3913  * is returned to the remote caller.
3914  *
3915  * Additionally, if the remote caller attempts to invoke methods or
3916  * access properties not mentioned in @introspection_data the
3917  * <literal>org.freedesktop.DBus.Error.UnknownMethod</literal> resp.
3918  * <literal>org.freedesktop.DBus.Error.InvalidArgs</literal> errors
3919  * are returned to the caller.
3920  *
3921  * It is considered a programming error if the
3922  * #GDBusInterfaceGetPropertyFunc function in @vtable returns a
3923  * #GVariant of incorrect type.
3924  *
3925  * If an existing callback is already registered at @object_path and
3926  * @interface_name, then @error is set to #G_IO_ERROR_EXISTS.
3927  *
3928  * See <xref linkend="gdbus-server"/> for an example of how to use this method.
3929  *
3930  * Returns: 0 if @error is set, otherwise a registration id (never 0)
3931  * that can be used with g_dbus_connection_unregister_object() .
3932  *
3933  * Since: 2.26
3934  */
3935 guint
3936 g_dbus_connection_register_object (GDBusConnection            *connection,
3937                                    const gchar                *object_path,
3938                                    const gchar                *interface_name,
3939                                    const GDBusInterfaceInfo   *introspection_data,
3940                                    const GDBusInterfaceVTable *vtable,
3941                                    gpointer                    user_data,
3942                                    GDestroyNotify              user_data_free_func,
3943                                    GError                    **error)
3944 {
3945   ExportedObject *eo;
3946   ExportedInterface *ei;
3947   guint ret;
3948
3949   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
3950   g_return_val_if_fail (!g_dbus_connection_is_closed (connection), 0);
3951   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
3952   g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), 0);
3953   g_return_val_if_fail (introspection_data != NULL, 0);
3954   g_return_val_if_fail (error == NULL || *error == NULL, 0);
3955
3956   ret = 0;
3957
3958   CONNECTION_LOCK (connection);
3959
3960   eo = g_hash_table_lookup (connection->priv->map_object_path_to_eo, object_path);
3961   if (eo == NULL)
3962     {
3963       eo = g_new0 (ExportedObject, 1);
3964       eo->object_path = g_strdup (object_path);
3965       eo->connection = connection;
3966       eo->map_if_name_to_ei = g_hash_table_new_full (g_str_hash,
3967                                                      g_str_equal,
3968                                                      NULL,
3969                                                      (GDestroyNotify) exported_interface_free);
3970       g_hash_table_insert (connection->priv->map_object_path_to_eo, eo->object_path, eo);
3971     }
3972
3973   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
3974   if (ei != NULL)
3975     {
3976       g_set_error (error,
3977                    G_IO_ERROR,
3978                    G_IO_ERROR_EXISTS,
3979                    _("An object is already exported for the interface %s at %s"),
3980                    interface_name,
3981                    object_path);
3982       goto out;
3983     }
3984
3985   ei = g_new0 (ExportedInterface, 1);
3986   ei->id = _global_registration_id++; /* TODO: overflow etc. */
3987   ei->eo = eo;
3988   ei->user_data = user_data;
3989   ei->user_data_free_func = user_data_free_func;
3990   ei->vtable = vtable;
3991   ei->introspection_data = introspection_data;
3992   ei->interface_name = g_strdup (interface_name);
3993   ei->context = g_main_context_get_thread_default ();
3994   if (ei->context != NULL)
3995     g_main_context_ref (ei->context);
3996
3997   g_hash_table_insert (eo->map_if_name_to_ei,
3998                        (gpointer) ei->interface_name,
3999                        ei);
4000   g_hash_table_insert (connection->priv->map_id_to_ei,
4001                        GUINT_TO_POINTER (ei->id),
4002                        ei);
4003
4004   ret = ei->id;
4005
4006  out:
4007   CONNECTION_UNLOCK (connection);
4008
4009   return ret;
4010 }
4011
4012 /**
4013  * g_dbus_connection_unregister_object:
4014  * @connection: A #GDBusConnection.
4015  * @registration_id: A registration id obtained from g_dbus_connection_register_object().
4016  *
4017  * Unregisters an object.
4018  *
4019  * Returns: %TRUE if the object was unregistered, %FALSE otherwise.
4020  *
4021  * Since: 2.26
4022  */
4023 gboolean
4024 g_dbus_connection_unregister_object (GDBusConnection *connection,
4025                                      guint            registration_id)
4026 {
4027   ExportedInterface *ei;
4028   ExportedObject *eo;
4029   gboolean ret;
4030
4031   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
4032
4033   ret = FALSE;
4034
4035   CONNECTION_LOCK (connection);
4036
4037   ei = g_hash_table_lookup (connection->priv->map_id_to_ei,
4038                             GUINT_TO_POINTER (registration_id));
4039   if (ei == NULL)
4040     goto out;
4041
4042   eo = ei->eo;
4043
4044   g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_ei, GUINT_TO_POINTER (ei->id)));
4045   g_warn_if_fail (g_hash_table_remove (eo->map_if_name_to_ei, ei->interface_name));
4046   /* unregister object path if we have no more exported interfaces */
4047   if (g_hash_table_size (eo->map_if_name_to_ei) == 0)
4048     g_warn_if_fail (g_hash_table_remove (connection->priv->map_object_path_to_eo,
4049                                          eo->object_path));
4050
4051   ret = TRUE;
4052
4053  out:
4054   CONNECTION_UNLOCK (connection);
4055
4056   return ret;
4057 }
4058
4059 /* ---------------------------------------------------------------------------------------------------- */
4060
4061 /**
4062  * g_dbus_connection_emit_signal:
4063  * @connection: A #GDBusConnection.
4064  * @destination_bus_name: The unique bus name for the destination for the signal or %NULL to emit to all listeners.
4065  * @object_path: Path of remote object.
4066  * @interface_name: D-Bus interface to emit a signal on.
4067  * @signal_name: The name of the signal to emit.
4068  * @parameters: A #GVariant tuple with parameters for the signal or %NULL if not passing parameters.
4069  * @error: Return location for error or %NULL.
4070  *
4071  * Emits a signal.
4072  *
4073  * This can only fail if @parameters is not compatible with the D-Bus protocol.
4074  *
4075  * Returns: %TRUE unless @error is set.
4076  *
4077  * Since: 2.26
4078  */
4079 gboolean
4080 g_dbus_connection_emit_signal (GDBusConnection  *connection,
4081                                const gchar      *destination_bus_name,
4082                                const gchar      *object_path,
4083                                const gchar      *interface_name,
4084                                const gchar      *signal_name,
4085                                GVariant         *parameters,
4086                                GError          **error)
4087 {
4088   GDBusMessage *message;
4089   gboolean ret;
4090
4091   message = NULL;
4092   ret = FALSE;
4093
4094   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
4095   g_return_val_if_fail (destination_bus_name == NULL || g_dbus_is_name (destination_bus_name), FALSE);
4096   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), FALSE);
4097   g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), FALSE);
4098   g_return_val_if_fail (signal_name != NULL && g_dbus_is_member_name (signal_name), FALSE);
4099   g_return_val_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), FALSE);
4100
4101   message = g_dbus_message_new_signal (object_path,
4102                                        interface_name,
4103                                        signal_name);
4104
4105   if (destination_bus_name != NULL)
4106     g_dbus_message_set_header (message,
4107                                G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION,
4108                                g_variant_new_string (destination_bus_name));
4109
4110   if (parameters != NULL)
4111     g_dbus_message_set_body (message, parameters);
4112
4113   ret = g_dbus_connection_send_message (connection, message, NULL, error);
4114   g_object_unref (message);
4115
4116   return ret;
4117 }
4118
4119 static void
4120 add_call_flags (GDBusMessage           *message,
4121                          GDBusCallFlags  flags)
4122 {
4123   if (flags & G_DBUS_CALL_FLAGS_NO_AUTO_START)
4124     g_dbus_message_set_flags (message, G_DBUS_MESSAGE_FLAGS_NO_AUTO_START);
4125 }
4126
4127 /**
4128  * g_dbus_connection_call:
4129  * @connection: A #GDBusConnection.
4130  * @bus_name: A unique or well-known bus name or %NULL if @connection is not a message bus connection.
4131  * @object_path: Path of remote object.
4132  * @interface_name: D-Bus interface to invoke method on.
4133  * @method_name: The name of the method to invoke.
4134  * @parameters: A #GVariant tuple with parameters for the method or %NULL if not passing parameters.
4135  * @flags: Flags from the #GDBusCallFlags enumeration.
4136  * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
4137  * @cancellable: A #GCancellable or %NULL.
4138  * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
4139  * care about the result of the method invocation.
4140  * @user_data: The data to pass to @callback.
4141  *
4142  * Asynchronously invokes the @method_name method on the
4143  * @interface_name D-Bus interface on the remote object at
4144  * @object_path owned by @bus_name.
4145  *
4146  * If @connection is closed then the operation will fail with
4147  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
4148  * fail with %G_IO_ERROR_CANCELLED. If @parameters contains a value
4149  * not compatible with the D-Bus protocol, the operation fails with
4150  * %G_IO_ERROR_INVALID_ARGUMENT.
4151  *
4152  * If the @parameters #GVariant is floating, it is consumed. This allows
4153  * convenient 'inline' use of g_variant_new(), e.g.:
4154  * |[
4155  *  g_dbus_connection_call (connection,
4156  *                          "org.freedesktop.StringThings",
4157  *                          "/org/freedesktop/StringThings",
4158  *                          "org.freedesktop.StringThings",
4159  *                          "TwoStrings",
4160  *                          g_variant_new ("(ss)",
4161  *                                         "Thing One",
4162  *                                         "Thing Two"),
4163  *                          G_DBUS_CALL_FLAGS_NONE,
4164  *                          -1,
4165  *                          NULL,
4166  *                          (GAsyncReadyCallback) two_strings_done,
4167  *                          NULL);
4168  * ]|
4169  *
4170  * This is an asynchronous method. When the operation is finished, @callback will be invoked
4171  * in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
4172  * of the thread you are calling this method from. You can then call
4173  * g_dbus_connection_call_finish() to get the result of the operation.
4174  * See g_dbus_connection_call_sync() for the synchronous version of this
4175  * function.
4176  *
4177  * Since: 2.26
4178  */
4179 void
4180 g_dbus_connection_call (GDBusConnection        *connection,
4181                         const gchar            *bus_name,
4182                         const gchar            *object_path,
4183                         const gchar            *interface_name,
4184                         const gchar            *method_name,
4185                         GVariant               *parameters,
4186                         GDBusCallFlags          flags,
4187                         gint                    timeout_msec,
4188                         GCancellable           *cancellable,
4189                         GAsyncReadyCallback     callback,
4190                         gpointer                user_data)
4191 {
4192   GDBusMessage *message;
4193
4194   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
4195   g_return_if_fail (bus_name == NULL || g_dbus_is_name (bus_name));
4196   g_return_if_fail (object_path != NULL && g_variant_is_object_path (object_path));
4197   g_return_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name));
4198   g_return_if_fail (method_name != NULL && g_dbus_is_member_name (method_name));
4199   g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
4200   g_return_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE));
4201
4202   message = g_dbus_message_new_method_call (bus_name,
4203                                             object_path,
4204                                             interface_name,
4205                                             method_name);
4206   add_call_flags (message, flags);
4207   if (parameters != NULL)
4208     g_dbus_message_set_body (message, parameters);
4209
4210   g_dbus_connection_send_message_with_reply (connection,
4211                                              message,
4212                                              timeout_msec,
4213                                              NULL, /* volatile guint32 *out_serial */
4214                                              cancellable,
4215                                              callback,
4216                                              user_data);
4217
4218   if (message != NULL)
4219     g_object_unref (message);
4220 }
4221
4222 static GVariant *
4223 decode_method_reply (GDBusMessage  *reply,
4224                      GError       **error)
4225 {
4226   GVariant *result;
4227
4228   result = NULL;
4229   switch (g_dbus_message_get_message_type (reply))
4230     {
4231     case G_DBUS_MESSAGE_TYPE_METHOD_RETURN:
4232       result = g_dbus_message_get_body (reply);
4233       if (result == NULL)
4234         {
4235           result = g_variant_new ("()");
4236           g_variant_ref_sink (result);
4237         }
4238       else
4239         {
4240           g_variant_ref (result);
4241         }
4242       break;
4243
4244     case G_DBUS_MESSAGE_TYPE_ERROR:
4245       g_dbus_message_to_gerror (reply, error);
4246       break;
4247
4248     default:
4249       g_assert_not_reached ();
4250       break;
4251     }
4252
4253   return result;
4254 }
4255
4256 /**
4257  * g_dbus_connection_call_finish:
4258  * @connection: A #GDBusConnection.
4259  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_call().
4260  * @error: Return location for error or %NULL.
4261  *
4262  * Finishes an operation started with g_dbus_connection_call().
4263  *
4264  * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
4265  * return values. Free with g_variant_unref().
4266  *
4267  * Since: 2.26
4268  */
4269 GVariant *
4270 g_dbus_connection_call_finish (GDBusConnection  *connection,
4271                                GAsyncResult     *res,
4272                                GError          **error)
4273 {
4274   GDBusMessage *reply;
4275   GVariant *result;
4276
4277   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
4278   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
4279   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
4280
4281   result = NULL;
4282
4283   reply = g_dbus_connection_send_message_with_reply_finish (connection, res, error);
4284   if (reply == NULL)
4285     goto out;
4286
4287   result = decode_method_reply (reply, error);
4288
4289   g_object_unref (reply);
4290
4291  out:
4292   return result;
4293 }
4294
4295 /* ---------------------------------------------------------------------------------------------------- */
4296
4297 /**
4298  * g_dbus_connection_call_sync:
4299  * @connection: A #GDBusConnection.
4300  * @bus_name: A unique or well-known bus name.
4301  * @object_path: Path of remote object.
4302  * @interface_name: D-Bus interface to invoke method on.
4303  * @method_name: The name of the method to invoke.
4304  * @parameters: A #GVariant tuple with parameters for the method or %NULL if not passing parameters.
4305  * @flags: Flags from the #GDBusCallFlags enumeration.
4306  * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
4307  * @cancellable: A #GCancellable or %NULL.
4308  * @error: Return location for error or %NULL.
4309  *
4310  * Synchronously invokes the @method_name method on the
4311  * @interface_name D-Bus interface on the remote object at
4312  * @object_path owned by @bus_name.
4313  *
4314  * If @connection is closed then the operation will fail with
4315  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the
4316  * operation will fail with %G_IO_ERROR_CANCELLED. If @parameters
4317  * contains a value not compatible with the D-Bus protocol, the operation
4318  * fails with %G_IO_ERROR_INVALID_ARGUMENT.
4319  *
4320  * If the @parameters #GVariant is floating, it is consumed.
4321  * This allows convenient 'inline' use of g_variant_new(), e.g.:
4322  * |[
4323  *  g_dbus_connection_call_sync (connection,
4324  *                               "org.freedesktop.StringThings",
4325  *                               "/org/freedesktop/StringThings",
4326  *                               "org.freedesktop.StringThings",
4327  *                               "TwoStrings",
4328  *                               g_variant_new ("(ss)",
4329  *                                              "Thing One",
4330  *                                              "Thing Two"),
4331  *                               G_DBUS_CALL_FLAGS_NONE,
4332  *                               -1,
4333  *                               NULL,
4334  *                               &amp;error);
4335  * ]|
4336  *
4337  * The calling thread is blocked until a reply is received. See
4338  * g_dbus_connection_call() for the asynchronous version of
4339  * this method.
4340  *
4341  * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
4342  * return values. Free with g_variant_unref().
4343  *
4344  * Since: 2.26
4345  */
4346 GVariant *
4347 g_dbus_connection_call_sync (GDBusConnection         *connection,
4348                              const gchar             *bus_name,
4349                              const gchar             *object_path,
4350                              const gchar             *interface_name,
4351                              const gchar             *method_name,
4352                              GVariant                *parameters,
4353                              GDBusCallFlags           flags,
4354                              gint                     timeout_msec,
4355                              GCancellable            *cancellable,
4356                              GError                 **error)
4357 {
4358   GDBusMessage *message;
4359   GDBusMessage *reply;
4360   GVariant *result;
4361
4362   message = NULL;
4363   reply = NULL;
4364   result = NULL;
4365
4366   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
4367   g_return_val_if_fail (bus_name == NULL || g_dbus_is_name (bus_name), NULL);
4368   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), NULL);
4369   g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), NULL);
4370   g_return_val_if_fail (method_name != NULL && g_dbus_is_member_name (method_name), NULL);
4371   g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
4372   g_return_val_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL);
4373
4374   message = g_dbus_message_new_method_call (bus_name,
4375                                             object_path,
4376                                             interface_name,
4377                                             method_name);
4378   add_call_flags (message, flags);
4379   if (parameters != NULL)
4380     g_dbus_message_set_body (message, parameters);
4381
4382   reply = g_dbus_connection_send_message_with_reply_sync (connection,
4383                                                           message,
4384                                                           timeout_msec,
4385                                                           NULL, /* volatile guint32 *out_serial */
4386                                                           cancellable,
4387                                                           error);
4388
4389   if (reply == NULL)
4390     goto out;
4391
4392   result = decode_method_reply (reply, error);
4393
4394  out:
4395   if (message != NULL)
4396     g_object_unref (message);
4397   if (reply != NULL)
4398     g_object_unref (reply);
4399
4400   return result;
4401 }
4402
4403 /* ---------------------------------------------------------------------------------------------------- */
4404
4405 struct ExportedSubtree
4406 {
4407   guint                     id;
4408   gchar                    *object_path;
4409   GDBusConnection          *connection;
4410   const GDBusSubtreeVTable *vtable;
4411   GDBusSubtreeFlags         flags;
4412
4413   GMainContext             *context;
4414   gpointer                  user_data;
4415   GDestroyNotify            user_data_free_func;
4416 };
4417
4418 static void
4419 exported_subtree_free (ExportedSubtree *es)
4420 {
4421   if (es->user_data_free_func != NULL)
4422     /* TODO: push to thread-default mainloop */
4423     es->user_data_free_func (es->user_data);
4424
4425   if (es->context != NULL)
4426     g_main_context_unref (es->context);
4427
4428   g_free (es->object_path);
4429   g_free (es);
4430 }
4431
4432 /* called without lock held */
4433 static gboolean
4434 handle_subtree_introspect (GDBusConnection *connection,
4435                            ExportedSubtree *es,
4436                            GDBusMessage    *message)
4437 {
4438   GString *s;
4439   gboolean handled;
4440   GDBusMessage *reply;
4441   gchar **children;
4442   gboolean is_root;
4443   const gchar *sender;
4444   const gchar *requested_object_path;
4445   const gchar *requested_node;
4446   GPtrArray *interfaces;
4447   guint n;
4448   gchar **subnode_paths;
4449
4450   handled = FALSE;
4451
4452   requested_object_path = g_dbus_message_get_path (message);
4453   sender = g_dbus_message_get_sender (message);
4454   is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
4455
4456   s = g_string_new (NULL);
4457   introspect_append_header (s);
4458
4459   /* Strictly we don't need the children in dynamic mode, but we avoid the
4460    * conditionals to preserve code clarity
4461    */
4462   children = es->vtable->enumerate (es->connection,
4463                                     sender,
4464                                     es->object_path,
4465                                     es->user_data);
4466
4467   if (!is_root)
4468     {
4469       requested_node = strrchr (requested_object_path, '/') + 1;
4470
4471       /* Assert existence of object if we are not dynamic */
4472       if (!(es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES) &&
4473           !_g_strv_has_string ((const gchar * const *) children, requested_node))
4474         goto out;
4475     }
4476   else
4477     {
4478       requested_node = "/";
4479     }
4480
4481   interfaces = es->vtable->introspect (es->connection,
4482                                        sender,
4483                                        es->object_path,
4484                                        requested_node,
4485                                        es->user_data);
4486   if (interfaces != NULL)
4487     {
4488       if (interfaces->len > 0)
4489         {
4490           /* we're in business */
4491           introspect_append_standard_interfaces (s);
4492
4493           for (n = 0; n < interfaces->len; n++)
4494             {
4495               const GDBusInterfaceInfo *interface_info = interfaces->pdata[n];
4496               g_dbus_interface_info_generate_xml (interface_info, 2, s);
4497             }
4498         }
4499       g_ptr_array_unref (interfaces);
4500     }
4501
4502   /* then include <node> entries from the Subtree for the root */
4503   if (is_root)
4504     {
4505       for (n = 0; children != NULL && children[n] != NULL; n++)
4506         g_string_append_printf (s, "  <node name=\"%s\"/>\n", children[n]);
4507     }
4508
4509   /* finally include nodes registered below us */
4510   subnode_paths = g_dbus_connection_list_registered (es->connection, requested_object_path);
4511   for (n = 0; subnode_paths != NULL && subnode_paths[n] != NULL; n++)
4512     g_string_append_printf (s, "  <node name=\"%s\"/>\n", subnode_paths[n]);
4513   g_strfreev (subnode_paths);
4514
4515   g_string_append (s, "</node>\n");
4516
4517   reply = g_dbus_message_new_method_reply (message);
4518   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
4519   g_dbus_connection_send_message (connection, reply, NULL, NULL);
4520   g_object_unref (reply);
4521
4522   handled = TRUE;
4523
4524  out:
4525   g_string_free (s, TRUE);
4526   g_strfreev (children);
4527   return handled;
4528 }
4529
4530 /* called without lock held */
4531 static gboolean
4532 handle_subtree_method_invocation (GDBusConnection *connection,
4533                                   ExportedSubtree *es,
4534                                   GDBusMessage    *message)
4535 {
4536   gboolean handled;;
4537   const gchar *sender;
4538   const gchar *interface_name;
4539   const gchar *member;
4540   const gchar *signature;
4541   const gchar *requested_object_path;
4542   const gchar *requested_node;
4543   gboolean is_root;
4544   gchar **children;
4545   const GDBusInterfaceInfo *introspection_data;
4546   const GDBusInterfaceVTable *interface_vtable;
4547   gpointer interface_user_data;
4548   guint n;
4549   GPtrArray *interfaces;
4550   gboolean is_property_get;
4551   gboolean is_property_set;
4552   gboolean is_property_get_all;
4553
4554   handled = FALSE;
4555   interfaces = NULL;
4556
4557   requested_object_path = g_dbus_message_get_path (message);
4558   sender = g_dbus_message_get_sender (message);
4559   interface_name = g_dbus_message_get_interface (message);
4560   member = g_dbus_message_get_member (message);
4561   signature = g_dbus_message_get_signature (message);
4562   is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
4563
4564   is_property_get = FALSE;
4565   is_property_set = FALSE;
4566   is_property_get_all = FALSE;
4567   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0)
4568     {
4569       if (g_strcmp0 (member, "Get") == 0 && g_strcmp0 (signature, "ss") == 0)
4570         is_property_get = TRUE;
4571       else if (g_strcmp0 (member, "Set") == 0 && g_strcmp0 (signature, "ssv") == 0)
4572         is_property_set = TRUE;
4573       else if (g_strcmp0 (member, "GetAll") == 0 && g_strcmp0 (signature, "s") == 0)
4574         is_property_get_all = TRUE;
4575     }
4576
4577   children = es->vtable->enumerate (es->connection,
4578                                     sender,
4579                                     es->object_path,
4580                                     es->user_data);
4581
4582   if (!is_root)
4583     {
4584       requested_node = strrchr (requested_object_path, '/') + 1;
4585
4586       /* If not dynamic, skip if requested node is not part of children */
4587       if (!(es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES) &&
4588           !_g_strv_has_string ((const gchar * const *) children, requested_node))
4589         goto out;
4590     }
4591   else
4592     {
4593       requested_node = "/";
4594     }
4595
4596   /* get introspection data for the node */
4597   interfaces = es->vtable->introspect (es->connection,
4598                                        sender,
4599                                        requested_object_path,
4600                                        requested_node,
4601                                        es->user_data);
4602   g_assert (interfaces != NULL);
4603   introspection_data = NULL;
4604   for (n = 0; n < interfaces->len; n++)
4605     {
4606       const GDBusInterfaceInfo *id_n = (const GDBusInterfaceInfo *) interfaces->pdata[n];
4607       if (g_strcmp0 (id_n->name, interface_name) == 0)
4608         introspection_data = id_n;
4609     }
4610
4611   /* dispatch the call if the user wants to handle it */
4612   if (introspection_data != NULL)
4613     {
4614       /* figure out where to dispatch the method call */
4615       interface_user_data = NULL;
4616       interface_vtable = es->vtable->dispatch (es->connection,
4617                                                sender,
4618                                                es->object_path,
4619                                                interface_name,
4620                                                requested_node,
4621                                                &interface_user_data,
4622                                                es->user_data);
4623       if (interface_vtable == NULL)
4624         goto out;
4625
4626       CONNECTION_LOCK (connection);
4627       handled = validate_and_maybe_schedule_method_call (es->connection,
4628                                                          message,
4629                                                          introspection_data,
4630                                                          interface_vtable,
4631                                                          es->context,
4632                                                          interface_user_data);
4633       CONNECTION_UNLOCK (connection);
4634     }
4635   /* handle org.freedesktop.DBus.Properties interface if not explicitly handled */
4636   else if (is_property_get || is_property_set || is_property_get_all)
4637     {
4638       if (is_property_get)
4639         g_variant_get (g_dbus_message_get_body (message), "(ss)", &interface_name, NULL);
4640       else if (is_property_set)
4641         g_variant_get (g_dbus_message_get_body (message), "(ssv)", &interface_name, NULL, NULL);
4642       else if (is_property_get_all)
4643         g_variant_get (g_dbus_message_get_body (message), "(s)", &interface_name, NULL, NULL);
4644       else
4645         g_assert_not_reached ();
4646
4647       /* see if the object supports this interface at all */
4648       for (n = 0; n < interfaces->len; n++)
4649         {
4650           const GDBusInterfaceInfo *id_n = (const GDBusInterfaceInfo *) interfaces->pdata[n];
4651           if (g_strcmp0 (id_n->name, interface_name) == 0)
4652             introspection_data = id_n;
4653         }
4654
4655       /* Fail with org.freedesktop.DBus.Error.InvalidArgs if the user-code
4656        * claims it won't support the interface
4657        */
4658       if (introspection_data == NULL)
4659         {
4660           GDBusMessage *reply;
4661           reply = g_dbus_message_new_method_error (message,
4662                                                    "org.freedesktop.DBus.Error.InvalidArgs",
4663                                                    _("No such interface `%s'"),
4664                                                    interface_name);
4665           g_dbus_connection_send_message (es->connection, reply, NULL, NULL);
4666           g_object_unref (reply);
4667           handled = TRUE;
4668           goto out;
4669         }
4670
4671       /* figure out where to dispatch the property get/set/getall calls */
4672       interface_user_data = NULL;
4673       interface_vtable = es->vtable->dispatch (es->connection,
4674                                                sender,
4675                                                es->object_path,
4676                                                interface_name,
4677                                                requested_node,
4678                                                &interface_user_data,
4679                                                es->user_data);
4680       if (interface_vtable == NULL)
4681         goto out;
4682
4683       if (is_property_get || is_property_set)
4684         {
4685           CONNECTION_LOCK (connection);
4686           handled = validate_and_maybe_schedule_property_getset (es->connection,
4687                                                                  message,
4688                                                                  is_property_get,
4689                                                                  introspection_data,
4690                                                                  interface_vtable,
4691                                                                  es->context,
4692                                                                  interface_user_data);
4693           CONNECTION_UNLOCK (connection);
4694         }
4695       else if (is_property_get_all)
4696         {
4697           CONNECTION_LOCK (connection);
4698           handled = validate_and_maybe_schedule_property_get_all (es->connection,
4699                                                                   message,
4700                                                                   introspection_data,
4701                                                                   interface_vtable,
4702                                                                   es->context,
4703                                                                   interface_user_data);
4704           CONNECTION_UNLOCK (connection);
4705         }
4706     }
4707
4708  out:
4709   if (interfaces != NULL)
4710     g_ptr_array_unref (interfaces);
4711   g_strfreev (children);
4712   return handled;
4713 }
4714
4715 typedef struct
4716 {
4717   GDBusMessage *message;
4718   ExportedSubtree *es;
4719 } SubtreeDeferredData;
4720
4721 static void
4722 subtree_deferred_data_free (SubtreeDeferredData *data)
4723 {
4724   g_object_unref (data->message);
4725   g_free (data);
4726 }
4727
4728 /* called without lock held in the thread where the caller registered the subtree */
4729 static gboolean
4730 process_subtree_vtable_message_in_idle_cb (gpointer _data)
4731 {
4732   SubtreeDeferredData *data = _data;
4733   gboolean handled;
4734
4735   handled = FALSE;
4736
4737   if (g_strcmp0 (g_dbus_message_get_interface (data->message), "org.freedesktop.DBus.Introspectable") == 0 &&
4738       g_strcmp0 (g_dbus_message_get_member (data->message), "Introspect") == 0 &&
4739       g_strcmp0 (g_dbus_message_get_signature (data->message), "") == 0)
4740     handled = handle_subtree_introspect (data->es->connection,
4741                                          data->es,
4742                                          data->message);
4743   else
4744     handled = handle_subtree_method_invocation (data->es->connection,
4745                                                 data->es,
4746                                                 data->message);
4747
4748   if (!handled)
4749     {
4750       CONNECTION_LOCK (data->es->connection);
4751       handled = handle_generic_unlocked (data->es->connection, data->message);
4752       CONNECTION_UNLOCK (data->es->connection);
4753     }
4754
4755   /* if we couldn't handle the request, just bail with the UnknownMethod error */
4756   if (!handled)
4757     {
4758       GDBusMessage *reply;
4759       reply = g_dbus_message_new_method_error (data->message,
4760                                                "org.freedesktop.DBus.Error.UnknownMethod",
4761                                                _("Method `%s' on interface `%s' with signature `%s' does not exist"),
4762                                                g_dbus_message_get_member (data->message),
4763                                                g_dbus_message_get_interface (data->message),
4764                                                g_dbus_message_get_signature (data->message));
4765       g_dbus_connection_send_message (data->es->connection, reply, NULL, NULL);
4766       g_object_unref (reply);
4767     }
4768
4769   return FALSE;
4770 }
4771
4772 /* called in message handler thread with lock held */
4773 static gboolean
4774 subtree_message_func (GDBusConnection *connection,
4775                       ExportedSubtree *es,
4776                       GDBusMessage    *message)
4777 {
4778   GSource *idle_source;
4779   SubtreeDeferredData *data;
4780
4781   data = g_new0 (SubtreeDeferredData, 1);
4782   data->message = g_object_ref (message);
4783   data->es = es;
4784
4785   /* defer this call to an idle handler in the right thread */
4786   idle_source = g_idle_source_new ();
4787   g_source_set_priority (idle_source, G_PRIORITY_HIGH);
4788   g_source_set_callback (idle_source,
4789                          process_subtree_vtable_message_in_idle_cb,
4790                          data,
4791                          (GDestroyNotify) subtree_deferred_data_free);
4792   g_source_attach (idle_source, es->context);
4793   g_source_unref (idle_source);
4794
4795   /* since we own the entire subtree, handlers for objects not in the subtree have been
4796    * tried already by libdbus-1 - so we just need to ensure that we're always going
4797    * to reply to the message
4798    */
4799   return TRUE;
4800 }
4801
4802 /**
4803  * g_dbus_connection_register_subtree:
4804  * @connection: A #GDBusConnection.
4805  * @object_path: The object path to register the subtree at.
4806  * @vtable: A #GDBusSubtreeVTable to enumerate, introspect and dispatch nodes in the subtree.
4807  * @flags: Flags used to fine tune the behavior of the subtree.
4808  * @user_data: Data to pass to functions in @vtable.
4809  * @user_data_free_func: Function to call when the subtree is unregistered.
4810  * @error: Return location for error or %NULL.
4811  *
4812  * Registers a whole subtree of <quote>dynamic</quote> objects.
4813  *
4814  * The @enumerate and @introspection functions in @vtable are used to
4815  * convey, to remote callers, what nodes exist in the subtree rooted
4816  * by @object_path.
4817  *
4818  * When handling remote calls into any node in the subtree, first the
4819  * @enumerate function is used to check if the node exists. If the node exists
4820  * or the #G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is set
4821  * the @introspection function is used to check if the node supports the
4822  * requested method. If so, the @dispatch function is used to determine
4823  * where to dispatch the call. The collected #GDBusInterfaceVTable and
4824  * #gpointer will be used to call into the interface vtable for processing
4825  * the request.
4826  *
4827  * All calls into user-provided code will be invoked in the <link
4828  * linkend="g-main-context-push-thread-default">thread-default main
4829  * loop</link> of the thread you are calling this method from.
4830  *
4831  * If an existing subtree is already registered at @object_path or
4832  * then @error is set to #G_IO_ERROR_EXISTS.
4833  *
4834  * Note that it is valid to register regular objects (using
4835  * g_dbus_connection_register_object()) in a subtree registered with
4836  * g_dbus_connection_register_subtree() - if so, the subtree handler
4837  * is tried as the last resort. One way to think about a subtree
4838  * handler is to consider it a <quote>fallback handler</quote>
4839  * for object paths not registered via g_dbus_connection_register_object()
4840  * or other bindings.
4841  *
4842  * See <xref linkend="gdbus-subtree-server"/> for an example of how to use this method.
4843  *
4844  * Returns: 0 if @error is set, otherwise a subtree registration id (never 0)
4845  * that can be used with g_dbus_connection_unregister_subtree() .
4846  *
4847  * Since: 2.26
4848  */
4849 guint
4850 g_dbus_connection_register_subtree (GDBusConnection           *connection,
4851                                     const gchar               *object_path,
4852                                     const GDBusSubtreeVTable  *vtable,
4853                                     GDBusSubtreeFlags          flags,
4854                                     gpointer                   user_data,
4855                                     GDestroyNotify             user_data_free_func,
4856                                     GError                   **error)
4857 {
4858   guint ret;
4859   ExportedSubtree *es;
4860
4861   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
4862   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
4863   g_return_val_if_fail (vtable != NULL, 0);
4864   g_return_val_if_fail (error == NULL || *error == NULL, 0);
4865
4866   ret = 0;
4867
4868   CONNECTION_LOCK (connection);
4869
4870   es = g_hash_table_lookup (connection->priv->map_object_path_to_es, object_path);
4871   if (es != NULL)
4872     {
4873       g_set_error (error,
4874                    G_IO_ERROR,
4875                    G_IO_ERROR_EXISTS,
4876                    _("A subtree is already exported for %s"),
4877                    object_path);
4878       goto out;
4879     }
4880
4881   es = g_new0 (ExportedSubtree, 1);
4882   es->object_path = g_strdup (object_path);
4883   es->connection = connection;
4884
4885   es->vtable = vtable;
4886   es->flags = flags;
4887   es->id = _global_subtree_registration_id++; /* TODO: overflow etc. */
4888   es->user_data = user_data;
4889   es->user_data_free_func = user_data_free_func;
4890   es->context = g_main_context_get_thread_default ();
4891   if (es->context != NULL)
4892     g_main_context_ref (es->context);
4893
4894   g_hash_table_insert (connection->priv->map_object_path_to_es, es->object_path, es);
4895   g_hash_table_insert (connection->priv->map_id_to_es,
4896                        GUINT_TO_POINTER (es->id),
4897                        es);
4898
4899   ret = es->id;
4900
4901  out:
4902   CONNECTION_UNLOCK (connection);
4903
4904   return ret;
4905 }
4906
4907 /* ---------------------------------------------------------------------------------------------------- */
4908
4909 /**
4910  * g_dbus_connection_unregister_subtree:
4911  * @connection: A #GDBusConnection.
4912  * @registration_id: A subtree registration id obtained from g_dbus_connection_register_subtree().
4913  *
4914  * Unregisters a subtree.
4915  *
4916  * Returns: %TRUE if the subtree was unregistered, %FALSE otherwise.
4917  *
4918  * Since: 2.26
4919  */
4920 gboolean
4921 g_dbus_connection_unregister_subtree (GDBusConnection *connection,
4922                                       guint            registration_id)
4923 {
4924   ExportedSubtree *es;
4925   gboolean ret;
4926
4927   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
4928
4929   ret = FALSE;
4930
4931   CONNECTION_LOCK (connection);
4932
4933   es = g_hash_table_lookup (connection->priv->map_id_to_es,
4934                             GUINT_TO_POINTER (registration_id));
4935   if (es == NULL)
4936     goto out;
4937
4938   g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_es, GUINT_TO_POINTER (es->id)));
4939   g_warn_if_fail (g_hash_table_remove (connection->priv->map_object_path_to_es, es->object_path));
4940
4941   ret = TRUE;
4942
4943  out:
4944   CONNECTION_UNLOCK (connection);
4945
4946   return ret;
4947 }
4948
4949 /* ---------------------------------------------------------------------------------------------------- */
4950
4951 /* must be called with lock held */
4952 static void
4953 handle_generic_ping_unlocked (GDBusConnection *connection,
4954                               const gchar     *object_path,
4955                               GDBusMessage    *message)
4956 {
4957   GDBusMessage *reply;
4958   reply = g_dbus_message_new_method_reply (message);
4959   g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
4960   g_object_unref (reply);
4961 }
4962
4963 /* must be called with lock held */
4964 static void
4965 handle_generic_get_machine_id_unlocked (GDBusConnection *connection,
4966                                         const gchar     *object_path,
4967                                         GDBusMessage    *message)
4968 {
4969   GDBusMessage *reply;
4970
4971   reply = NULL;
4972   if (connection->priv->machine_id == NULL)
4973     {
4974       GError *error;
4975       error = NULL;
4976       /* TODO: use PACKAGE_LOCALSTATEDIR ? */
4977       if (!g_file_get_contents ("/var/lib/dbus/machine-id",
4978                                 &connection->priv->machine_id,
4979                                 NULL,
4980                                 &error))
4981         {
4982           reply = g_dbus_message_new_method_error (message,
4983                                                    "org.freedesktop.DBus.Error.Failed",
4984                                                    _("Unable to load /var/lib/dbus/machine-id: %s"),
4985                                                    error->message);
4986           g_error_free (error);
4987         }
4988       else
4989         {
4990           g_strstrip (connection->priv->machine_id);
4991           /* TODO: validate value */
4992         }
4993     }
4994
4995   if (reply == NULL)
4996     {
4997       reply = g_dbus_message_new_method_reply (message);
4998       g_dbus_message_set_body (reply, g_variant_new ("(s)", connection->priv->machine_id));
4999     }
5000   g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
5001   g_object_unref (reply);
5002 }
5003
5004 /* must be called with lock held */
5005 static void
5006 handle_generic_introspect_unlocked (GDBusConnection *connection,
5007                                     const gchar     *object_path,
5008                                     GDBusMessage    *message)
5009 {
5010   guint n;
5011   GString *s;
5012   gchar **registered;
5013   GDBusMessage *reply;
5014
5015   /* first the header */
5016   s = g_string_new (NULL);
5017   introspect_append_header (s);
5018
5019   registered = g_dbus_connection_list_registered_unlocked (connection, object_path);
5020   for (n = 0; registered != NULL && registered[n] != NULL; n++)
5021       g_string_append_printf (s, "  <node name=\"%s\"/>\n", registered[n]);
5022   g_strfreev (registered);
5023   g_string_append (s, "</node>\n");
5024
5025   reply = g_dbus_message_new_method_reply (message);
5026   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
5027   g_dbus_connection_send_message_unlocked (connection, reply, NULL, NULL);
5028   g_object_unref (reply);
5029   g_string_free (s, TRUE);
5030 }
5031
5032 /* must be called with lock held */
5033 static gboolean
5034 handle_generic_unlocked (GDBusConnection *connection,
5035                          GDBusMessage    *message)
5036 {
5037   gboolean handled;
5038   const gchar *interface_name;
5039   const gchar *member;
5040   const gchar *signature;
5041   const gchar *path;
5042
5043   CONNECTION_ENSURE_LOCK (connection);
5044
5045   handled = FALSE;
5046
5047   interface_name = g_dbus_message_get_interface (message);
5048   member = g_dbus_message_get_member (message);
5049   signature = g_dbus_message_get_signature (message);
5050   path = g_dbus_message_get_path (message);
5051
5052   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
5053       g_strcmp0 (member, "Introspect") == 0 &&
5054       g_strcmp0 (signature, "") == 0)
5055     {
5056       handle_generic_introspect_unlocked (connection, path, message);
5057       handled = TRUE;
5058     }
5059   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
5060            g_strcmp0 (member, "Ping") == 0 &&
5061            g_strcmp0 (signature, "") == 0)
5062     {
5063       handle_generic_ping_unlocked (connection, path, message);
5064       handled = TRUE;
5065     }
5066   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
5067            g_strcmp0 (member, "GetMachineId") == 0 &&
5068            g_strcmp0 (signature, "") == 0)
5069     {
5070       handle_generic_get_machine_id_unlocked (connection, path, message);
5071       handled = TRUE;
5072     }
5073
5074   return handled;
5075 }
5076
5077 /* ---------------------------------------------------------------------------------------------------- */
5078
5079 /* called in message handler thread with lock held */
5080 static void
5081 distribute_method_call (GDBusConnection *connection,
5082                         GDBusMessage    *message)
5083 {
5084   ExportedObject *eo;
5085   ExportedSubtree *es;
5086   const gchar *object_path;
5087   const gchar *interface_name;
5088   const gchar *member;
5089   const gchar *signature;
5090   const gchar *path;
5091   gchar *subtree_path;
5092   gchar *needle;
5093
5094   g_assert (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL);
5095
5096   interface_name = g_dbus_message_get_interface (message);
5097   member = g_dbus_message_get_member (message);
5098   signature = g_dbus_message_get_signature (message);
5099   path = g_dbus_message_get_path (message);
5100   subtree_path = g_strdup (path);
5101   needle = strrchr (subtree_path, '/');
5102   if (needle != NULL && needle != subtree_path)
5103     {
5104       *needle = '\0';
5105     }
5106   else
5107     {
5108       g_free (subtree_path);
5109       subtree_path = NULL;
5110     }
5111
5112 #if 0
5113   g_debug ("interface    = `%s'", interface_name);
5114   g_debug ("member       = `%s'", member);
5115   g_debug ("signature    = `%s'", signature);
5116   g_debug ("path         = `%s'", path);
5117   g_debug ("subtree_path = `%s'", subtree_path != NULL ? subtree_path : "N/A");
5118 #endif
5119
5120   object_path = g_dbus_message_get_path (message);
5121   g_assert (object_path != NULL);
5122
5123   eo = g_hash_table_lookup (connection->priv->map_object_path_to_eo, object_path);
5124   if (eo != NULL)
5125     {
5126       if (obj_message_func (connection, eo, message))
5127         goto out;
5128     }
5129
5130   es = g_hash_table_lookup (connection->priv->map_object_path_to_es, object_path);
5131   if (es != NULL)
5132     {
5133       if (subtree_message_func (connection, es, message))
5134         goto out;
5135     }
5136
5137   if (subtree_path != NULL)
5138     {
5139       es = g_hash_table_lookup (connection->priv->map_object_path_to_es, subtree_path);
5140       if (es != NULL)
5141         {
5142           if (subtree_message_func (connection, es, message))
5143             goto out;
5144         }
5145     }
5146
5147   if (handle_generic_unlocked (connection, message))
5148     goto out;
5149
5150   /* if we end up here, the message has not been not handled */
5151
5152  out:
5153   g_free (subtree_path);
5154 }
5155
5156 /* ---------------------------------------------------------------------------------------------------- */
5157
5158 static GDBusConnection **
5159 message_bus_get_singleton (GBusType   bus_type,
5160                            GError   **error)
5161 {
5162   GDBusConnection **ret;
5163   const gchar *starter_bus;
5164
5165   ret = NULL;
5166
5167   switch (bus_type)
5168     {
5169     case G_BUS_TYPE_SESSION:
5170       ret = &the_session_bus;
5171       break;
5172
5173     case G_BUS_TYPE_SYSTEM:
5174       ret = &the_system_bus;
5175       break;
5176
5177     case G_BUS_TYPE_STARTER:
5178       starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
5179       if (g_strcmp0 (starter_bus, "session") == 0)
5180         {
5181           ret = message_bus_get_singleton (G_BUS_TYPE_SESSION, error);
5182           goto out;
5183         }
5184       else if (g_strcmp0 (starter_bus, "system") == 0)
5185         {
5186           ret = message_bus_get_singleton (G_BUS_TYPE_SYSTEM, error);
5187           goto out;
5188         }
5189       else
5190         {
5191           if (starter_bus != NULL)
5192             {
5193               g_set_error (error,
5194                            G_IO_ERROR,
5195                            G_IO_ERROR_INVALID_ARGUMENT,
5196                            _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
5197                              " - unknown value `%s'"),
5198                            starter_bus);
5199             }
5200           else
5201             {
5202               g_set_error_literal (error,
5203                                    G_IO_ERROR,
5204                                    G_IO_ERROR_INVALID_ARGUMENT,
5205                                    _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
5206                                      "variable is not set"));
5207             }
5208         }
5209       break;
5210
5211     default:
5212       g_assert_not_reached ();
5213       break;
5214     }
5215
5216  out:
5217   return ret;
5218 }
5219
5220 static GDBusConnection *
5221 get_uninitialized_connection (GBusType       bus_type,
5222                               GCancellable  *cancellable,
5223                               GError       **error)
5224 {
5225   GDBusConnection **singleton;
5226   GDBusConnection *ret;
5227
5228   ret = NULL;
5229
5230   G_LOCK (message_bus_lock);
5231   singleton = message_bus_get_singleton (bus_type, error);
5232   if (singleton == NULL)
5233     goto out;
5234
5235   if (*singleton == NULL)
5236     {
5237       gchar *address;
5238       address = g_dbus_address_get_for_bus_sync (bus_type, cancellable, error);
5239       if (address == NULL)
5240         goto out;
5241       ret = *singleton = g_object_new (G_TYPE_DBUS_CONNECTION,
5242                                        "address", address,
5243                                        "flags", G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
5244                                                 G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
5245                                        "exit-on-close", TRUE,
5246                                        NULL);
5247     }
5248   else
5249     {
5250       ret = g_object_ref (*singleton);
5251     }
5252
5253   g_assert (ret != NULL);
5254
5255  out:
5256   G_UNLOCK (message_bus_lock);
5257   return ret;
5258 }
5259
5260 /**
5261  * g_bus_get_sync:
5262  * @bus_type: A #GBusType.
5263  * @cancellable: A #GCancellable or %NULL.
5264  * @error: Return location for error or %NULL.
5265  *
5266  * Synchronously connects to the message bus specified by @bus_type.
5267  * Note that the returned object may shared with other callers,
5268  * e.g. if two separate parts of a process calls this function with
5269  * the same @bus_type, they will share the same object.
5270  *
5271  * This is a synchronous failable function. See g_bus_get() and
5272  * g_bus_get_finish() for the asynchronous version.
5273  *
5274  * The returned object is a singleton, that is, shared with other
5275  * callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
5276  * event that you need a private message bus connection, use
5277  * g_dbus_address_get_for_bus_sync() and
5278  * g_dbus_connection_new_for_address().
5279  *
5280  * Note that the returned #GDBusConnection object will (usually) have
5281  * the #GDBusConnection:exit-on-close property set to %TRUE.
5282  *
5283  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
5284  *
5285  * Since: 2.26
5286  */
5287 GDBusConnection *
5288 g_bus_get_sync (GBusType       bus_type,
5289                 GCancellable  *cancellable,
5290                 GError       **error)
5291 {
5292   GDBusConnection *connection;
5293
5294   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
5295
5296   connection = get_uninitialized_connection (bus_type, cancellable, error);
5297   if (connection == NULL)
5298     goto out;
5299
5300   if (!g_initable_init (G_INITABLE (connection), cancellable, error))
5301     {
5302       g_object_unref (connection);
5303       connection = NULL;
5304     }
5305
5306  out:
5307   return connection;
5308 }
5309
5310 static void
5311 bus_get_async_initable_cb (GObject      *source_object,
5312                            GAsyncResult *res,
5313                            gpointer      user_data)
5314 {
5315   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
5316   GError *error;
5317
5318   error = NULL;
5319   if (!g_async_initable_init_finish (G_ASYNC_INITABLE (source_object),
5320                                      res,
5321                                      &error))
5322     {
5323       g_assert (error != NULL);
5324       g_simple_async_result_set_from_error (simple, error);
5325       g_error_free (error);
5326       g_object_unref (source_object);
5327     }
5328   else
5329     {
5330       g_simple_async_result_set_op_res_gpointer (simple,
5331                                                  source_object,
5332                                                  g_object_unref);
5333     }
5334   g_simple_async_result_complete_in_idle (simple);
5335   g_object_unref (simple);
5336 }
5337
5338 /**
5339  * g_bus_get:
5340  * @bus_type: A #GBusType.
5341  * @cancellable: A #GCancellable or %NULL.
5342  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
5343  * @user_data: The data to pass to @callback.
5344  *
5345  * Asynchronously connects to the message bus specified by @bus_type.
5346  *
5347  * When the operation is finished, @callback will be invoked. You can
5348  * then call g_bus_get_finish() to get the result of the operation.
5349  *
5350  * This is a asynchronous failable function. See g_bus_get_sync() for
5351  * the synchronous version.
5352  *
5353  * Since: 2.26
5354  */
5355 void
5356 g_bus_get (GBusType             bus_type,
5357            GCancellable        *cancellable,
5358            GAsyncReadyCallback  callback,
5359            gpointer             user_data)
5360 {
5361   GDBusConnection *connection;
5362   GSimpleAsyncResult *simple;
5363   GError *error;
5364
5365   simple = g_simple_async_result_new (NULL,
5366                                       callback,
5367                                       user_data,
5368                                       g_bus_get);
5369
5370   error = NULL;
5371   connection = get_uninitialized_connection (bus_type, cancellable, &error);
5372   if (connection == NULL)
5373     {
5374       g_assert (error != NULL);
5375       g_simple_async_result_set_from_error (simple, error);
5376       g_error_free (error);
5377       g_simple_async_result_complete_in_idle (simple);
5378       g_object_unref (simple);
5379     }
5380   else
5381     {
5382       g_async_initable_init_async (G_ASYNC_INITABLE (connection),
5383                                    G_PRIORITY_DEFAULT,
5384                                    cancellable,
5385                                    bus_get_async_initable_cb,
5386                                    simple);
5387     }
5388 }
5389
5390 /**
5391  * g_bus_get_finish:
5392  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_bus_get().
5393  * @error: Return location for error or %NULL.
5394  *
5395  * Finishes an operation started with g_bus_get().
5396  *
5397  * The returned object is a singleton, that is, shared with other
5398  * callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
5399  * event that you need a private message bus connection, use
5400  * g_dbus_address_get_for_bus() and
5401  * g_dbus_connection_new_for_address().
5402  *
5403  * Note that the returned #GDBusConnection object will (usually) have
5404  * the #GDBusConnection:exit-on-close property set to %TRUE.
5405  *
5406  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
5407  *
5408  * Since: 2.26
5409  */
5410 GDBusConnection *
5411 g_bus_get_finish (GAsyncResult  *res,
5412                   GError       **error)
5413 {
5414   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
5415   GObject *object;
5416   GDBusConnection *ret;
5417
5418   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
5419
5420   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_bus_get);
5421
5422   ret = NULL;
5423
5424   if (g_simple_async_result_propagate_error (simple, error))
5425     goto out;
5426
5427   object = g_simple_async_result_get_op_res_gpointer (simple);
5428   g_assert (object != NULL);
5429   ret = g_object_ref (G_DBUS_CONNECTION (object));
5430
5431  out:
5432   return ret;
5433 }
5434
5435 /* ---------------------------------------------------------------------------------------------------- */
5436
5437 #define __G_DBUS_CONNECTION_C__
5438 #include "gioaliasdef.c"