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  * - would be nice to expose GDBusAuthMechanism and an extension point
  27  *
  28  * - Need to rewrite GDBusAuth and rework GDBusAuthMechanism. In particular
  29  *   the mechanism VFuncs need to be able to set an error.
  30  *
  31  * - Need to document other mechanisms/sources for determining the D-Bus
  32  *   address of a well-known bus.
  33  *
  34  *   - e.g. on Win32 we need code like from here
  35  *
  36  *     http://cgit.freedesktop.org/~david/gdbus-standalone/tree/gdbus/gdbusaddress.c#n900
  37  *
  38  *     that was never copied over here because it originally was copy-paste
  39  *     from the GPLv2 / AFL 2.1 libdbus sources.
  40  *
  41  *   - on OS X we need to look in launchd for the address
  42  *
  43  *     https://bugs.freedesktop.org/show_bug.cgi?id=14259
  44  *
  45  *   - on X11 we need to look in a X11 property on the X server
  46  *     - (we can also just use dbus-launch(1) from the D-Bus
  47  *        distribution)
  48  *
  49  *   - (ideally) this requires D-Bus spec work because none of
  50  *     this has never really been specced out properly (excect
  51  *     the X11 bits)
  52  *
  53  * - Related to the above, we also need to be able to launch a message bus
  54  *   instance.... Since we don't want to write our own bus daemon we should
  55  *   launch dbus-daemon(1) (thus: Win32 and OS X need to bundle it)
  56  *
  57  * - probably want a G_DBUS_NONCE_TCP_TMPDIR environment variable
  58  *   to specify where the nonce is stored. This will allow people to use
  59  *   G_DBUS_NONCE_TCP_TMPDIR=/mnt/secure.company.server/dbus-nonce-dir
  60  *   to easily acheive secure RPC via nonce-tcp.
  61  *
  62  * - need to expose an extension point for resolving D-Bus address and
  63  *   turning them into GIOStream objects. This will allow us to implement
  64  *   e.g. X11 D-Bus transports without dlopen()'ing or linking against
  65  *   libX11 from libgio.
  66  *   - see g_dbus_address_connect() in gdbusaddress.c
  67  *
  68  * - would be cute to use kernel-specific APIs to resolve fds for
  69  *   debug output when using G_DBUS_DEBUG=message, e.g. in addition to
  70  *
  71  *     fd 21: dev=8:1,mode=0100644,ino=1171231,uid=0,gid=0,rdev=0:0,size=234,atime=1273070640,mtime=1267126160,ctime=1267126160
  72  *
  73  *   maybe we can show more information about what fd 21 really is.
  74  *   Ryan suggests looking in /proc/self/fd for clues / symlinks!
  75  *   Initial experiments on Linux 2.6 suggests that the symlink looks
  76  *   like this:
  77  *
  78  *    3 -> /proc/18068/fd
  79  *
  80  *   e.g. not of much use.
  81  *
  82  *  - GDBus High-Level docs
  83  *    - Proxy: properties, signals...
  84  *    - Connection: IOStream based, ::close, connection setup steps
  85  *                  mainloop integration, threading
  86  *    - Differences from libdbus (extend "Migrating from")
  87  *      - the message handling thread
  88  *      - Using GVariant instead of GValue
  89  *    - Explain why the high-level API is a good thing and what
  90  *      kind of pitfalls it avoids
  91  *      - Export objects before claiming names
  92  *    - Talk about auto-starting services (cf. GBusNameWatcherFlags)
  93  *
  94  *  - use abstract sockets in test code
  95  *   - right now it doesn't work, dbus-daemon(1) fails with
  96  *
  97  *        /gdbus/connection/filter: Failed to start message bus: Failed to bind
  98  *        socket "/tmp/g-dbus-tests-pid-28531": Address already in use
  99  *        ** WARNING **: Error reading address from dbus daemon, 0 bytes read
 100  *
 101  *     or similar.
 102  */
 103
 104 #include "config.h"
 105
 106 #include <stdlib.h>
 107 #include <string.h>
 108 #include <sys/types.h>
 109 #ifdef HAVE_UNISTD_H
 110 #include <unistd.h>
 111 #endif
 112
 113 #include "gdbusauth.h"
 114 #include "gdbusutils.h"
 115 #include "gdbusaddress.h"
 116 #include "gdbusmessage.h"
 117 #include "gdbusconnection.h"
 118 #include "gdbuserror.h"
 119 #include "gioenumtypes.h"
 120 #include "gdbusintrospection.h"
 121 #include "gdbusmethodinvocation.h"
 122 #include "gdbusprivate.h"
 123 #include "gdbusauthobserver.h"
 124 #include "gio-marshal.h"
 125 #include "ginitable.h"
 126 #include "gasyncinitable.h"
 127 #include "giostream.h"
 128 #include "gasyncresult.h"
 129 #include "gsimpleasyncresult.h"
 130
 131 #ifdef G_OS_UNIX
 132 #include "gunixconnection.h"
 133 #include "gunixfdmessage.h"
 134 #endif
 135
 136 #include "glibintl.h"
 137
 138 /**
 139  * SECTION:gdbusconnection
 140  * @short_description: D-Bus Connections
 141  * @include: gio/gio.h
 142  *
 143  * The #GDBusConnection type is used for D-Bus connections to remote
 144  * peers such as a message buses. It is a low-level API that offers a
 145  * lot of flexibility. For instance, it lets you establish a connection
 146  * over any transport that can by represented as an #GIOStream.
 147  *
 148  * This class is rarely used directly in D-Bus clients. If you are writing
 149  * an D-Bus client, it is often easier to use the g_bus_own_name(),
 150  * g_bus_watch_name() or g_dbus_proxy_new_for_bus() APIs.
 151  *
 152  * <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>
 153  *
 154  * <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>
 155  *
 156  * <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>
 157  *
 158  * <example id="gdbus-export"><title>Exporting a GObject</title><programlisting><xi:include xmlns:xi="http://www.w3.org/2001/XInclude" parse="text" href="../../../../gio/tests/gdbus-example-export.c"><xi:fallback>FIXME: MISSING XINCLUDE CONTENT</xi:fallback></xi:include></programlisting></example>
 159  */
 160
 161 /* ---------------------------------------------------------------------------------------------------- */
 162
 163 typedef struct _GDBusConnectionClass GDBusConnectionClass;
 164
 165 /**
 166  * GDBusConnectionClass:
 167  * @closed: Signal class handler for the #GDBusConnection::closed signal.
 168  *
 169  * Class structure for #GDBusConnection.
 170  *
 171  * Since: 2.26
 172  */
 173 struct _GDBusConnectionClass
 174 {
 175   /*< private >*/
 176   GObjectClass parent_class;
 177
 178   /*< public >*/
 179   /* Signals */
 180   void (*closed) (GDBusConnection *connection,
 181                   gboolean         remote_peer_vanished,
 182                   GError          *error);
 183 };
 184
 185 G_LOCK_DEFINE_STATIC (message_bus_lock);
 186
 187 static GDBusConnection *the_session_bus = NULL;
 188 static GDBusConnection *the_system_bus = NULL;
 189
 190 /* ---------------------------------------------------------------------------------------------------- */
 191
 192 typedef struct
 193 {
 194   GDestroyNotify              callback;
 195   gpointer                    user_data;
 196   GMainContext               *context;
 197 } CallDestroyNotifyData;
 198
 199 static gboolean
 200 call_destroy_notify_data_in_idle (gpointer user_data)
 201 {
 202   CallDestroyNotifyData *data = user_data;
 203   data->callback (data->user_data);
 204   return FALSE;
 205 }
 206
 207 static void
 208 call_destroy_notify_data_free (CallDestroyNotifyData *data)
 209 {
 210   if (data->context != NULL)
 211     g_main_context_unref (data->context);
 212   g_free (data);
 213 }
 214
 215 /*
 216  * call_destroy_notify: <internal>
 217  * @context: A #GMainContext or %NULL.
 218  * @callback: A #GDestroyNotify or %NULL.
 219  * @user_data: Data to pass to @callback.
 220  *
 221  * Schedules @callback to run in @context.
 222  */
 223 static void
 224 call_destroy_notify (GMainContext  *context,
 225                      GDestroyNotify callback,
 226                      gpointer       user_data)
 227 {
 228   if (callback == NULL)
 229     goto out;
 230
 231   if (context == g_main_context_get_thread_default ())
 232     {
 233       callback (user_data);
 234     }
 235   else
 236     {
 237       GSource *idle_source;
 238       CallDestroyNotifyData *data;
 239
 240       data = g_new0 (CallDestroyNotifyData, 1);
 241       data->callback = callback;
 242       data->user_data = user_data;
 243       data->context = context;
 244       if (data->context != NULL)
 245         g_main_context_ref (data->context);
 246
 247       idle_source = g_idle_source_new ();
 248       g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
 249       g_source_set_callback (idle_source,
 250                              call_destroy_notify_data_in_idle,
 251                              data,
 252                              (GDestroyNotify) call_destroy_notify_data_free);
 253       g_source_attach (idle_source, data->context);
 254       g_source_unref (idle_source);
 255     }
 256
 257  out:
 258   ;
 259 }
 260
 261 /* ---------------------------------------------------------------------------------------------------- */
 262
 263 static gboolean
 264 _g_strv_has_string (const gchar* const *haystack,
 265                     const gchar        *needle)
 266 {
 267   guint n;
 268
 269   for (n = 0; haystack != NULL && haystack[n] != NULL; n++)
 270     {
 271       if (g_strcmp0 (haystack[n], needle) == 0)
 272         return TRUE;
 273     }
 274   return FALSE;
 275 }
 276
 277 /* ---------------------------------------------------------------------------------------------------- */
 278
 279 #ifdef G_OS_WIN32
 280 #define CONNECTION_ENSURE_LOCK(obj) do { ; } while (FALSE)
 281 #else
 282 // TODO: for some reason this doesn't work on Windows
 283 #define CONNECTION_ENSURE_LOCK(obj) do {                                \
 284     if (G_UNLIKELY (g_mutex_trylock((obj)->lock)))                      \
 285       {                                                                 \
 286         g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
 287                              "CONNECTION_ENSURE_LOCK: GDBusConnection object lock is not locked"); \
 288       }                                                                 \
 289   } while (FALSE)
 290 #endif
 291
 292 #define CONNECTION_LOCK(obj) do {                                       \
 293     g_mutex_lock ((obj)->lock);                                         \
 294   } while (FALSE)
 295
 296 #define CONNECTION_UNLOCK(obj) do {                                     \
 297     g_mutex_unlock ((obj)->lock);                                       \
 298   } while (FALSE)
 299
 300 /**
 301  * GDBusConnection:
 302  *
 303  * The #GDBusConnection structure contains only private data and
 304  * should only be accessed using the provided API.
 305  *
 306  * Since: 2.26
 307  */
 308 struct _GDBusConnection
 309 {
 310   /*< private >*/
 311   GObject parent_instance;
 312
 313   /* ------------------------------------------------------------------------ */
 314   /* -- General object state ------------------------------------------------ */
 315   /* ------------------------------------------------------------------------ */
 316
 317   /* object-wide lock */
 318   GMutex *lock;
 319
 320   /* A lock used in the init() method of the GInitable interface - see comments
 321    * in initable_init() for why a separate lock is needed
 322    */
 323   GMutex *init_lock;
 324
 325   /* Set (by loading the contents of /var/lib/dbus/machine-id) the first time
 326    * someone calls org.freedesktop.DBus.GetMachineId()
 327    */
 328   gchar *machine_id;
 329
 330   /* The underlying stream used for communication */
 331   GIOStream *stream;
 332
 333   /* The object used for authentication (if any) */
 334   GDBusAuth *auth;
 335
 336   /* Set to TRUE if the connection has been closed */
 337   gboolean closed;
 338
 339   /* Last serial used */
 340   guint32 last_serial;
 341
 342   /* The object used to send/receive message */
 343   GDBusWorker *worker;
 344
 345   /* If connected to a message bus, this contains the unique name assigned to
 346    * us by the bus (e.g. ":1.42")
 347    */
 348   gchar *bus_unique_name;
 349
 350   /* The GUID returned by the other side if we authenticed as a client or
 351    * the GUID to use if authenticating as a server
 352    */
 353   gchar *guid;
 354
 355   /* set to TRUE exactly when initable_init() has finished running */
 356   gboolean is_initialized;
 357
 358   /* If the connection could not be established during initable_init(), this GError will set */
 359   GError *initialization_error;
 360
 361   /* The result of g_main_context_get_thread_default() when the object
 362    * was created (the GObject _init() function) - this is used for delivery
 363    * of the :closed GObject signal.
 364    */
 365   GMainContext *main_context_at_construction;
 366
 367   /* construct properties */
 368   gchar *address;
 369   GDBusConnectionFlags flags;
 370
 371   /* Map used for managing method replies */
 372   GHashTable *map_method_serial_to_send_message_data;  /* guint32 -> SendMessageData* */
 373
 374   /* Maps used for managing signal subscription */
 375   GHashTable *map_rule_to_signal_data;                      /* match rule (gchar*)    -> SignalData */
 376   GHashTable *map_id_to_signal_data;                        /* id (guint)             -> SignalData */
 377   GHashTable *map_sender_unique_name_to_signal_data_array;  /* unique sender (gchar*) -> GPtrArray* of SignalData */
 378
 379   /* Maps used for managing exported objects and subtrees */
 380   GHashTable *map_object_path_to_eo;  /* gchar* -> ExportedObject* */
 381   GHashTable *map_id_to_ei;           /* guint  -> ExportedInterface* */
 382   GHashTable *map_object_path_to_es;  /* gchar* -> ExportedSubtree* */
 383   GHashTable *map_id_to_es;           /* guint  -> ExportedSubtree* */
 384
 385   /* Structure used for message filters */
 386   GPtrArray *filters;
 387
 388   /* Whether to exit on close */
 389   gboolean exit_on_close;
 390
 391   /* Capabilities negotiated during authentication */
 392   GDBusCapabilityFlags capabilities;
 393
 394   GDBusAuthObserver *authentication_observer;
 395   GCredentials *credentials;
 396
 397   /* set to TRUE when finalizing */
 398   gboolean finalizing;
 399 };
 400
 401 typedef struct ExportedObject ExportedObject;
 402 static void exported_object_free (ExportedObject *eo);
 403
 404 typedef struct ExportedSubtree ExportedSubtree;
 405 static void exported_subtree_free (ExportedSubtree *es);
 406
 407 enum
 408 {
 409   CLOSED_SIGNAL,
 410   LAST_SIGNAL,
 411 };
 412
 413 enum
 414 {
 415   PROP_0,
 416   PROP_STREAM,
 417   PROP_ADDRESS,
 418   PROP_FLAGS,
 419   PROP_GUID,
 420   PROP_UNIQUE_NAME,
 421   PROP_CLOSED,
 422   PROP_EXIT_ON_CLOSE,
 423   PROP_CAPABILITY_FLAGS,
 424   PROP_AUTHENTICATION_OBSERVER,
 425 };
 426
 427 static void distribute_signals (GDBusConnection  *connection,
 428                                 GDBusMessage     *message);
 429
 430 static void distribute_method_call (GDBusConnection  *connection,
 431                                     GDBusMessage     *message);
 432
 433 static gboolean handle_generic_unlocked (GDBusConnection *connection,
 434                                          GDBusMessage    *message);
 435
 436
 437 static void purge_all_signal_subscriptions (GDBusConnection *connection);
 438 static void purge_all_filters (GDBusConnection *connection);
 439
 440 #define _G_ENSURE_LOCK(name) do {                                       \
 441     if (G_UNLIKELY (G_TRYLOCK(name)))                                   \
 442       {                                                                 \
 443         g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
 444                              "_G_ENSURE_LOCK: Lock `" #name "' is not locked"); \
 445       }                                                                 \
 446   } while (FALSE)                                                       \
 447
 448 static guint signals[LAST_SIGNAL] = { 0 };
 449
 450 static void initable_iface_init       (GInitableIface      *initable_iface);
 451 static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface);
 452
 453 G_DEFINE_TYPE_WITH_CODE (GDBusConnection, g_dbus_connection, G_TYPE_OBJECT,
 454                          G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
 455                          G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init)
 456                          );
 457
 458 static GHashTable *alive_connections = NULL;
 459
 460 static void
 461 g_dbus_connection_dispose (GObject *object)
 462 {
 463   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 464
 465   G_LOCK (message_bus_lock);
 466   if (connection == the_session_bus)
 467     {
 468       the_session_bus = NULL;
 469     }
 470   else if (connection == the_system_bus)
 471     {
 472       the_system_bus = NULL;
 473     }
 474   CONNECTION_LOCK (connection);
 475   if (connection->worker != NULL)
 476     {
 477       _g_dbus_worker_stop (connection->worker);
 478       connection->worker = NULL;
 479       if (alive_connections != NULL)
 480         g_warn_if_fail (g_hash_table_remove (alive_connections, connection));
 481     }
 482   else
 483     {
 484       if (alive_connections != NULL)
 485         g_warn_if_fail (g_hash_table_lookup (alive_connections, connection) == NULL);
 486     }
 487   CONNECTION_UNLOCK (connection);
 488   G_UNLOCK (message_bus_lock);
 489
 490   if (G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose != NULL)
 491     G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose (object);
 492 }
 493
 494 static void
 495 g_dbus_connection_finalize (GObject *object)
 496 {
 497   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 498
 499   connection->finalizing = TRUE;
 500
 501   purge_all_signal_subscriptions (connection);
 502
 503   purge_all_filters (connection);
 504   g_ptr_array_unref (connection->filters);
 505
 506   if (connection->authentication_observer != NULL)
 507     g_object_unref (connection->authentication_observer);
 508
 509   if (connection->auth != NULL)
 510     g_object_unref (connection->auth);
 511
 512   if (connection->credentials)
 513     g_object_unref (connection->credentials);
 514
 515   if (connection->stream != NULL)
 516     {
 517       /* We don't really care if closing the stream succeeds or not */
 518       g_io_stream_close_async (connection->stream,
 519                                G_PRIORITY_DEFAULT,
 520                                NULL,  /* GCancellable */
 521                                NULL,  /* GAsyncReadyCallback */
 522                                NULL); /* userdata */
 523       g_object_unref (connection->stream);
 524       connection->stream = NULL;
 525     }
 526
 527   g_free (connection->address);
 528
 529   g_free (connection->guid);
 530   g_free (connection->bus_unique_name);
 531
 532   if (connection->initialization_error != NULL)
 533     g_error_free (connection->initialization_error);
 534
 535   g_hash_table_unref (connection->map_method_serial_to_send_message_data);
 536
 537   g_hash_table_unref (connection->map_rule_to_signal_data);
 538   g_hash_table_unref (connection->map_id_to_signal_data);
 539   g_hash_table_unref (connection->map_sender_unique_name_to_signal_data_array);
 540
 541   g_hash_table_unref (connection->map_id_to_ei);
 542   g_hash_table_unref (connection->map_object_path_to_eo);
 543   g_hash_table_unref (connection->map_id_to_es);
 544   g_hash_table_unref (connection->map_object_path_to_es);
 545
 546   if (connection->main_context_at_construction != NULL)
 547     g_main_context_unref (connection->main_context_at_construction);
 548
 549   g_free (connection->machine_id);
 550
 551   g_mutex_free (connection->init_lock);
 552   g_mutex_free (connection->lock);
 553
 554   G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize (object);
 555 }
 556
 557 static void
 558 g_dbus_connection_get_property (GObject    *object,
 559                                 guint       prop_id,
 560                                 GValue     *value,
 561                                 GParamSpec *pspec)
 562 {
 563   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 564
 565   switch (prop_id)
 566     {
 567     case PROP_STREAM:
 568       g_value_set_object (value, g_dbus_connection_get_stream (connection));
 569       break;
 570
 571     case PROP_GUID:
 572       g_value_set_string (value, g_dbus_connection_get_guid (connection));
 573       break;
 574
 575     case PROP_UNIQUE_NAME:
 576       g_value_set_string (value, g_dbus_connection_get_unique_name (connection));
 577       break;
 578
 579     case PROP_CLOSED:
 580       g_value_set_boolean (value, g_dbus_connection_is_closed (connection));
 581       break;
 582
 583     case PROP_EXIT_ON_CLOSE:
 584       g_value_set_boolean (value, g_dbus_connection_get_exit_on_close (connection));
 585       break;
 586
 587     case PROP_CAPABILITY_FLAGS:
 588       g_value_set_flags (value, g_dbus_connection_get_capabilities (connection));
 589       break;
 590
 591     default:
 592       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 593       break;
 594     }
 595 }
 596
 597 static void
 598 g_dbus_connection_set_property (GObject      *object,
 599                                 guint         prop_id,
 600                                 const GValue *value,
 601                                 GParamSpec   *pspec)
 602 {
 603   GDBusConnection *connection = G_DBUS_CONNECTION (object);
 604
 605   switch (prop_id)
 606     {
 607     case PROP_STREAM:
 608       connection->stream = g_value_dup_object (value);
 609       break;
 610
 611     case PROP_GUID:
 612       connection->guid = g_value_dup_string (value);
 613       break;
 614
 615     case PROP_ADDRESS:
 616       connection->address = g_value_dup_string (value);
 617       break;
 618
 619     case PROP_FLAGS:
 620       connection->flags = g_value_get_flags (value);
 621       break;
 622
 623     case PROP_EXIT_ON_CLOSE:
 624       g_dbus_connection_set_exit_on_close (connection, g_value_get_boolean (value));
 625       break;
 626
 627     case PROP_AUTHENTICATION_OBSERVER:
 628       connection->authentication_observer = g_value_dup_object (value);
 629       break;
 630
 631     default:
 632       G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 633       break;
 634     }
 635 }
 636
 637 static void
 638 g_dbus_connection_real_closed (GDBusConnection *connection,
 639                                gboolean         remote_peer_vanished,
 640                                GError          *error)
 641 {
 642   if (remote_peer_vanished && connection->exit_on_close)
 643     {
 644       if (error != NULL)
 645         {
 646           g_print ("%s: Remote peer vanished with error: %s (%s, %d). Exiting.\n",
 647                    G_STRFUNC,
 648                    error->message,
 649                    g_quark_to_string (error->domain), error->code);
 650         }
 651       else
 652         {
 653           g_print ("%s: Remote peer vanished. Exiting.\n", G_STRFUNC);
 654         }
 655       raise (SIGTERM);
 656     }
 657 }
 658
 659 static void
 660 g_dbus_connection_class_init (GDBusConnectionClass *klass)
 661 {
 662   GObjectClass *gobject_class;
 663
 664   gobject_class = G_OBJECT_CLASS (klass);
 665
 666   gobject_class->finalize     = g_dbus_connection_finalize;
 667   gobject_class->dispose      = g_dbus_connection_dispose;
 668   gobject_class->set_property = g_dbus_connection_set_property;
 669   gobject_class->get_property = g_dbus_connection_get_property;
 670
 671   klass->closed = g_dbus_connection_real_closed;
 672
 673   /**
 674    * GDBusConnection:stream:
 675    *
 676    * The underlying #GIOStream used for I/O.
 677    *
 678    * If this is passed on construction and is a #GSocketConnection,
 679    * then the corresponding #GSocket will be put into non-blocking mode.
 680    *
 681    * Since: 2.26
 682    */
 683   g_object_class_install_property (gobject_class,
 684                                    PROP_STREAM,
 685                                    g_param_spec_object ("stream",
 686                                                         P_("IO Stream"),
 687                                                         P_("The underlying streams used for I/O"),
 688                                                         G_TYPE_IO_STREAM,
 689                                                         G_PARAM_READABLE |
 690                                                         G_PARAM_WRITABLE |
 691                                                         G_PARAM_CONSTRUCT_ONLY |
 692                                                         G_PARAM_STATIC_NAME |
 693                                                         G_PARAM_STATIC_BLURB |
 694                                                         G_PARAM_STATIC_NICK));
 695
 696   /**
 697    * GDBusConnection:address:
 698    *
 699    * A D-Bus address specifying potential endpoints that can be used
 700    * when establishing the connection.
 701    *
 702    * Since: 2.26
 703    */
 704   g_object_class_install_property (gobject_class,
 705                                    PROP_ADDRESS,
 706                                    g_param_spec_string ("address",
 707                                                         P_("Address"),
 708                                                         P_("D-Bus address specifying potential socket endpoints"),
 709                                                         NULL,
 710                                                         G_PARAM_WRITABLE |
 711                                                         G_PARAM_CONSTRUCT_ONLY |
 712                                                         G_PARAM_STATIC_NAME |
 713                                                         G_PARAM_STATIC_BLURB |
 714                                                         G_PARAM_STATIC_NICK));
 715
 716   /**
 717    * GDBusConnection:flags:
 718    *
 719    * Flags from the #GDBusConnectionFlags enumeration.
 720    *
 721    * Since: 2.26
 722    */
 723   g_object_class_install_property (gobject_class,
 724                                    PROP_FLAGS,
 725                                    g_param_spec_flags ("flags",
 726                                                        P_("Flags"),
 727                                                        P_("Flags"),
 728                                                        G_TYPE_DBUS_CONNECTION_FLAGS,
 729                                                        G_DBUS_CONNECTION_FLAGS_NONE,
 730                                                        G_PARAM_WRITABLE |
 731                                                        G_PARAM_CONSTRUCT_ONLY |
 732                                                        G_PARAM_STATIC_NAME |
 733                                                        G_PARAM_STATIC_BLURB |
 734                                                        G_PARAM_STATIC_NICK));
 735
 736   /**
 737    * GDBusConnection:guid:
 738    *
 739    * The GUID of the peer performing the role of server when
 740    * authenticating.
 741    *
 742    * If you are constructing a #GDBusConnection and pass
 743    * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER in the
 744    * #GDBusConnection:flags property then you MUST also set this
 745    * property to a valid guid.
 746    *
 747    * If you are constructing a #GDBusConnection and pass
 748    * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT in the
 749    * #GDBusConnection:flags property you will be able to read the GUID
 750    * of the other peer here after the connection has been successfully
 751    * initialized.
 752    *
 753    * Since: 2.26
 754    */
 755   g_object_class_install_property (gobject_class,
 756                                    PROP_GUID,
 757                                    g_param_spec_string ("guid",
 758                                                         P_("GUID"),
 759                                                         P_("GUID of the server peer"),
 760                                                         NULL,
 761                                                         G_PARAM_READABLE |
 762                                                         G_PARAM_WRITABLE |
 763                                                         G_PARAM_CONSTRUCT_ONLY |
 764                                                         G_PARAM_STATIC_NAME |
 765                                                         G_PARAM_STATIC_BLURB |
 766                                                         G_PARAM_STATIC_NICK));
 767
 768   /**
 769    * GDBusConnection:unique-name:
 770    *
 771    * The unique name as assigned by the message bus or %NULL if the
 772    * connection is not open or not a message bus connection.
 773    *
 774    * Since: 2.26
 775    */
 776   g_object_class_install_property (gobject_class,
 777                                    PROP_UNIQUE_NAME,
 778                                    g_param_spec_string ("unique-name",
 779                                                         P_("unique-name"),
 780                                                         P_("Unique name of bus connection"),
 781                                                         NULL,
 782                                                         G_PARAM_READABLE |
 783                                                         G_PARAM_STATIC_NAME |
 784                                                         G_PARAM_STATIC_BLURB |
 785                                                         G_PARAM_STATIC_NICK));
 786
 787   /**
 788    * GDBusConnection:closed:
 789    *
 790    * A boolean specifying whether the connection has been closed.
 791    *
 792    * Since: 2.26
 793    */
 794   g_object_class_install_property (gobject_class,
 795                                    PROP_CLOSED,
 796                                    g_param_spec_boolean ("closed",
 797                                                          P_("Closed"),
 798                                                          P_("Whether the connection is closed"),
 799                                                          FALSE,
 800                                                          G_PARAM_READABLE |
 801                                                          G_PARAM_STATIC_NAME |
 802                                                          G_PARAM_STATIC_BLURB |
 803                                                          G_PARAM_STATIC_NICK));
 804
 805   /**
 806    * GDBusConnection:exit-on-close:
 807    *
 808    * A boolean specifying whether the process will be terminated (by
 809    * calling <literal>raise(SIGTERM)</literal>) if the connection
 810    * is closed by the remote peer.
 811    *
 812    * Since: 2.26
 813    */
 814   g_object_class_install_property (gobject_class,
 815                                    PROP_EXIT_ON_CLOSE,
 816                                    g_param_spec_boolean ("exit-on-close",
 817                                                          P_("Exit on close"),
 818                                                          P_("Whether the process is terminated when the connection is closed"),
 819                                                          FALSE,
 820                                                          G_PARAM_READABLE |
 821                                                          G_PARAM_WRITABLE |
 822                                                          G_PARAM_STATIC_NAME |
 823                                                          G_PARAM_STATIC_BLURB |
 824                                                          G_PARAM_STATIC_NICK));
 825
 826   /**
 827    * GDBusConnection:capabilities:
 828    *
 829    * Flags from the #GDBusCapabilityFlags enumeration
 830    * representing connection features negotiated with the other peer.
 831    *
 832    * Since: 2.26
 833    */
 834   g_object_class_install_property (gobject_class,
 835                                    PROP_CAPABILITY_FLAGS,
 836                                    g_param_spec_flags ("capabilities",
 837                                                        P_("Capabilities"),
 838                                                        P_("Capabilities"),
 839                                                        G_TYPE_DBUS_CAPABILITY_FLAGS,
 840                                                        G_DBUS_CAPABILITY_FLAGS_NONE,
 841                                                        G_PARAM_READABLE |
 842                                                        G_PARAM_STATIC_NAME |
 843                                                        G_PARAM_STATIC_BLURB |
 844                                                        G_PARAM_STATIC_NICK));
 845
 846   /**
 847    * GDBusConnection:authentication-observer:
 848    *
 849    * A #GDBusAuthObserver object to assist in the authentication process or %NULL.
 850    *
 851    * Since: 2.26
 852    */
 853   g_object_class_install_property (gobject_class,
 854                                    PROP_AUTHENTICATION_OBSERVER,
 855                                    g_param_spec_object ("authentication-observer",
 856                                                         P_("Authentication Observer"),
 857                                                         P_("Object used to assist in the authentication process"),
 858                                                         G_TYPE_DBUS_AUTH_OBSERVER,
 859                                                         G_PARAM_WRITABLE |
 860                                                         G_PARAM_CONSTRUCT_ONLY |
 861                                                         G_PARAM_STATIC_NAME |
 862                                                         G_PARAM_STATIC_BLURB |
 863                                                         G_PARAM_STATIC_NICK));
 864
 865   /**
 866    * GDBusConnection::closed:
 867    * @connection: The #GDBusConnection emitting the signal.
 868    * @remote_peer_vanished: %TRUE if @connection is closed because the
 869    * remote peer closed its end of the connection.
 870    * @error: A #GError with more details about the event or %NULL.
 871    *
 872    * Emitted when the connection is closed.
 873    *
 874    * The cause of this event can be
 875    * <itemizedlist>
 876    * <listitem><para>
 877    *    If g_dbus_connection_close() is called. In this case
 878    *    @remote_peer_vanished is set to %FALSE and @error is %NULL.
 879    * </para></listitem>
 880    * <listitem><para>
 881    *    If the remote peer closes the connection. In this case
 882    *    @remote_peer_vanished is set to %TRUE and @error is set.
 883    * </para></listitem>
 884    * <listitem><para>
 885    *    If the remote peer sends invalid or malformed data. In this
 886    *    case @remote_peer_vanished is set to %FALSE and @error
 887    *    is set.
 888    * </para></listitem>
 889    * </itemizedlist>
 890    *
 891    * Upon receiving this signal, you should give up your reference to
 892    * @connection. You are guaranteed that this signal is emitted only
 893    * once.
 894    *
 895    * Since: 2.26
 896    */
 897   signals[CLOSED_SIGNAL] = g_signal_new ("closed",
 898                                          G_TYPE_DBUS_CONNECTION,
 899                                          G_SIGNAL_RUN_LAST,
 900                                          G_STRUCT_OFFSET (GDBusConnectionClass, closed),
 901                                          NULL,
 902                                          NULL,
 903                                          _gio_marshal_VOID__BOOLEAN_BOXED,
 904                                          G_TYPE_NONE,
 905                                          2,
 906                                          G_TYPE_BOOLEAN,
 907                                          G_TYPE_ERROR);
 908 }
 909
 910 static void
 911 g_dbus_connection_init (GDBusConnection *connection)
 912 {
 913   connection->lock = g_mutex_new ();
 914   connection->init_lock = g_mutex_new ();
 915
 916   connection->map_method_serial_to_send_message_data = g_hash_table_new (g_direct_hash, g_direct_equal);
 917
 918   connection->map_rule_to_signal_data = g_hash_table_new (g_str_hash,
 919                                                           g_str_equal);
 920   connection->map_id_to_signal_data = g_hash_table_new (g_direct_hash,
 921                                                         g_direct_equal);
 922   connection->map_sender_unique_name_to_signal_data_array = g_hash_table_new_full (g_str_hash,
 923                                                                                    g_str_equal,
 924                                                                                    g_free,
 925                                                                                    (GDestroyNotify) g_ptr_array_unref);
 926
 927   connection->map_object_path_to_eo = g_hash_table_new_full (g_str_hash,
 928                                                              g_str_equal,
 929                                                              NULL,
 930                                                              (GDestroyNotify) exported_object_free);
 931
 932   connection->map_id_to_ei = g_hash_table_new (g_direct_hash,
 933                                                g_direct_equal);
 934
 935   connection->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
 936                                                              g_str_equal,
 937                                                              NULL,
 938                                                              (GDestroyNotify) exported_subtree_free);
 939
 940   connection->map_id_to_es = g_hash_table_new (g_direct_hash,
 941                                                g_direct_equal);
 942
 943   connection->main_context_at_construction = g_main_context_get_thread_default ();
 944   if (connection->main_context_at_construction != NULL)
 945     g_main_context_ref (connection->main_context_at_construction);
 946
 947   connection->filters = g_ptr_array_new ();
 948 }
 949
 950 /**
 951  * g_dbus_connection_get_stream:
 952  * @connection: a #GDBusConnection
 953  *
 954  * Gets the underlying stream used for IO.
 955  *
 956  * Returns: (transfer none): the stream used for IO
 957  *
 958  * Since: 2.26
 959  */
 960 GIOStream *
 961 g_dbus_connection_get_stream (GDBusConnection *connection)
 962 {
 963   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
 964   return connection->stream;
 965 }
 966
 967 /**
 968  * g_dbus_connection_start_message_processing:
 969  * @connection: A #GDBusConnection.
 970  *
 971  * If @connection was created with
 972  * %G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING, this method
 973  * starts processing messages. Does nothing on if @connection wasn't
 974  * created with this flag or if the method has already been called.
 975  *
 976  * Since: 2.26
 977  */
 978 void
 979 g_dbus_connection_start_message_processing (GDBusConnection *connection)
 980 {
 981   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
 982   _g_dbus_worker_unfreeze (connection->worker);
 983 }
 984
 985 /**
 986  * g_dbus_connection_is_closed:
 987  * @connection: A #GDBusConnection.
 988  *
 989  * Gets whether @connection is closed.
 990  *
 991  * Returns: %TRUE if the connection is closed, %FALSE otherwise.
 992  *
 993  * Since: 2.26
 994  */
 995 gboolean
 996 g_dbus_connection_is_closed (GDBusConnection *connection)
 997 {
 998   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
 999   return connection->closed;
1000 }
1001
1002 /**
1003  * g_dbus_connection_get_capabilities:
1004  * @connection: A #GDBusConnection.
1005  *
1006  * Gets the capabilities negotiated with the remote peer
1007  *
1008  * Returns: Zero or more flags from the #GDBusCapabilityFlags enumeration.
1009  *
1010  * Since: 2.26
1011  */
1012 GDBusCapabilityFlags
1013 g_dbus_connection_get_capabilities (GDBusConnection *connection)
1014 {
1015   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), G_DBUS_CAPABILITY_FLAGS_NONE);
1016   return connection->capabilities;
1017 }
1018
1019 /* ---------------------------------------------------------------------------------------------------- */
1020
1021 static void
1022 flush_in_thread_func (GSimpleAsyncResult *res,
1023                       GObject            *object,
1024                       GCancellable       *cancellable)
1025 {
1026   GError *error;
1027
1028   error = NULL;
1029   if (!g_dbus_connection_flush_sync (G_DBUS_CONNECTION (object),
1030                                      cancellable,
1031                                      &error))
1032     g_simple_async_result_take_error (res, error);
1033 }
1034
1035 /**
1036  * g_dbus_connection_flush:
1037  * @connection: A #GDBusConnection.
1038  * @cancellable: A #GCancellable or %NULL.
1039  * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is
1040  *            satisfied or %NULL if you don't care about the result.
1041  * @user_data: The data to pass to @callback.
1042  *
1043  * Asynchronously flushes @connection, that is, writes all queued
1044  * outgoing message to the transport and then flushes the transport
1045  * (using g_output_stream_flush_async()). This is useful in programs
1046  * that wants to emit a D-Bus signal and then exit
1047  * immediately. Without flushing the connection, there is no guarantee
1048  * that the message has been sent to the networking buffers in the OS
1049  * kernel.
1050  *
1051  * This is an asynchronous method. When the operation is finished,
1052  * @callback will be invoked in the <link
1053  * linkend="g-main-context-push-thread-default">thread-default main
1054  * loop</link> of the thread you are calling this method from. You can
1055  * then call g_dbus_connection_flush_finish() to get the result of the
1056  * operation.  See g_dbus_connection_flush_sync() for the synchronous
1057  * version.
1058  *
1059  * Since: 2.26
1060  */
1061 void
1062 g_dbus_connection_flush (GDBusConnection     *connection,
1063                          GCancellable        *cancellable,
1064                          GAsyncReadyCallback  callback,
1065                          gpointer             user_data)
1066 {
1067   GSimpleAsyncResult *simple;
1068
1069   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
1070
1071   simple = g_simple_async_result_new (G_OBJECT (connection),
1072                                       callback,
1073                                       user_data,
1074                                       g_dbus_connection_flush);
1075   g_simple_async_result_run_in_thread (simple,
1076                                        flush_in_thread_func,
1077                                        G_PRIORITY_DEFAULT,
1078                                        cancellable);
1079   g_object_unref (simple);
1080 }
1081
1082 /**
1083  * g_dbus_connection_flush_finish:
1084  * @connection: A #GDBusConnection.
1085  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_flush().
1086  * @error: Return location for error or %NULL.
1087  *
1088  * Finishes an operation started with g_dbus_connection_flush().
1089  *
1090  * Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
1091  *
1092  * Since: 2.26
1093  */
1094 gboolean
1095 g_dbus_connection_flush_finish (GDBusConnection  *connection,
1096                                 GAsyncResult     *res,
1097                                 GError          **error)
1098 {
1099   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
1100   gboolean ret;
1101
1102   ret = FALSE;
1103
1104   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1105   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
1106   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1107
1108   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_flush);
1109
1110   if (g_simple_async_result_propagate_error (simple, error))
1111     goto out;
1112
1113   ret = TRUE;
1114
1115  out:
1116   return ret;
1117 }
1118
1119 /**
1120  * g_dbus_connection_flush_sync:
1121  * @connection: A #GDBusConnection.
1122  * @cancellable: A #GCancellable or %NULL.
1123  * @error: Return location for error or %NULL.
1124  *
1125  * Synchronously flushes @connection. The calling thread is blocked
1126  * until this is done. See g_dbus_connection_flush() for the
1127  * asynchronous version of this method and more details about what it
1128  * does.
1129  *
1130  * Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
1131  *
1132  * Since: 2.26
1133  */
1134 gboolean
1135 g_dbus_connection_flush_sync (GDBusConnection  *connection,
1136                               GCancellable     *cancellable,
1137                               GError          **error)
1138 {
1139   gboolean ret;
1140
1141   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1142   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1143
1144   ret = FALSE;
1145
1146   if (connection->closed)
1147     {
1148       g_set_error_literal (error,
1149                            G_IO_ERROR,
1150                            G_IO_ERROR_CLOSED,
1151                            _("The connection is closed"));
1152       goto out;
1153     }
1154
1155   ret = _g_dbus_worker_flush_sync (connection->worker,
1156                                    cancellable,
1157                                    error);
1158
1159  out:
1160   return ret;
1161 }
1162
1163 /* ---------------------------------------------------------------------------------------------------- */
1164
1165 typedef struct
1166 {
1167   GDBusConnection *connection;
1168   GError *error;
1169   gboolean remote_peer_vanished;
1170 } EmitClosedData;
1171
1172 static void
1173 emit_closed_data_free (EmitClosedData *data)
1174 {
1175   g_object_unref (data->connection);
1176   if (data->error != NULL)
1177     g_error_free (data->error);
1178   g_free (data);
1179 }
1180
1181 static gboolean
1182 emit_closed_in_idle (gpointer user_data)
1183 {
1184   EmitClosedData *data = user_data;
1185   gboolean result;
1186
1187   g_object_notify (G_OBJECT (data->connection), "closed");
1188   g_signal_emit (data->connection,
1189                  signals[CLOSED_SIGNAL],
1190                  0,
1191                  data->remote_peer_vanished,
1192                  data->error,
1193                  &result);
1194   return FALSE;
1195 }
1196
1197 /* Can be called from any thread, must hold lock */
1198 static void
1199 set_closed_unlocked (GDBusConnection *connection,
1200                      gboolean         remote_peer_vanished,
1201                      GError          *error)
1202 {
1203   GSource *idle_source;
1204   EmitClosedData *data;
1205
1206   CONNECTION_ENSURE_LOCK (connection);
1207
1208   g_assert (!connection->closed);
1209
1210   connection->closed = TRUE;
1211
1212   data = g_new0 (EmitClosedData, 1);
1213   data->connection = g_object_ref (connection);
1214   data->remote_peer_vanished = remote_peer_vanished;
1215   data->error = error != NULL ? g_error_copy (error) : NULL;
1216
1217   idle_source = g_idle_source_new ();
1218   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1219   g_source_set_callback (idle_source,
1220                          emit_closed_in_idle,
1221                          data,
1222                          (GDestroyNotify) emit_closed_data_free);
1223   g_source_attach (idle_source, connection->main_context_at_construction);
1224   g_source_unref (idle_source);
1225 }
1226
1227 /* ---------------------------------------------------------------------------------------------------- */
1228
1229 static void
1230 close_in_thread_func (GSimpleAsyncResult *res,
1231                       GObject            *object,
1232                       GCancellable       *cancellable)
1233 {
1234   GError *error;
1235
1236   error = NULL;
1237   if (!g_dbus_connection_close_sync (G_DBUS_CONNECTION (object),
1238                                      cancellable,
1239                                      &error))
1240     g_simple_async_result_take_error (res, error);
1241 }
1242
1243 /**
1244  * g_dbus_connection_close:
1245  * @connection: A #GDBusConnection.
1246  * @cancellable: A #GCancellable or %NULL.
1247  * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is
1248  *            satisfied or %NULL if you don't care about the result.
1249  * @user_data: The data to pass to @callback.
1250  *
1251  * Closes @connection. Note that this never causes the process to
1252  * exit (this might only happen if the other end of a shared message
1253  * bus connection disconnects, see #GDBusConnection:exit-on-close).
1254  *
1255  * Once the connection is closed, operations such as sending a message
1256  * will return with the error %G_IO_ERROR_CLOSED. Closing a connection
1257  * will not automatically flush the connection so queued messages may
1258  * be lost. Use g_dbus_connection_flush() if you need such guarantees.
1259  *
1260  * If @connection is already closed, this method fails with
1261  * %G_IO_ERROR_CLOSED.
1262  *
1263  * When @connection has been closed, the #GDBusConnection::closed
1264  * signal is emitted in the <link
1265  * linkend="g-main-context-push-thread-default">thread-default main
1266  * loop</link> of the thread that @connection was constructed in.
1267  *
1268  * This is an asynchronous method. When the operation is finished,
1269  * @callback will be invoked in the <link
1270  * linkend="g-main-context-push-thread-default">thread-default main
1271  * loop</link> of the thread you are calling this method from. You can
1272  * then call g_dbus_connection_close_finish() to get the result of the
1273  * operation.  See g_dbus_connection_close_sync() for the synchronous
1274  * version.
1275  *
1276  * Since: 2.26
1277  */
1278 void
1279 g_dbus_connection_close (GDBusConnection     *connection,
1280                          GCancellable        *cancellable,
1281                          GAsyncReadyCallback  callback,
1282                          gpointer             user_data)
1283 {
1284   GSimpleAsyncResult *simple;
1285
1286   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
1287
1288   simple = g_simple_async_result_new (G_OBJECT (connection),
1289                                       callback,
1290                                       user_data,
1291                                       g_dbus_connection_close);
1292   g_simple_async_result_run_in_thread (simple,
1293                                        close_in_thread_func,
1294                                        G_PRIORITY_DEFAULT,
1295                                        cancellable);
1296   g_object_unref (simple);
1297 }
1298
1299 /**
1300  * g_dbus_connection_close_finish:
1301  * @connection: A #GDBusConnection.
1302  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_close().
1303  * @error: Return location for error or %NULL.
1304  *
1305  * Finishes an operation started with g_dbus_connection_close().
1306  *
1307  * Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
1308  *
1309  * Since: 2.26
1310  */
1311 gboolean
1312 g_dbus_connection_close_finish (GDBusConnection  *connection,
1313                                 GAsyncResult     *res,
1314                                 GError          **error)
1315 {
1316   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
1317   gboolean ret;
1318
1319   ret = FALSE;
1320
1321   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1322   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), FALSE);
1323   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1324
1325   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_close);
1326
1327   if (g_simple_async_result_propagate_error (simple, error))
1328     goto out;
1329
1330   ret = TRUE;
1331
1332  out:
1333   return ret;
1334 }
1335
1336 /**
1337  * g_dbus_connection_close_sync:
1338  * @connection: A #GDBusConnection.
1339  * @cancellable: A #GCancellable or %NULL.
1340  * @error: Return location for error or %NULL.
1341  *
1342  * Synchronously closees @connection. The calling thread is blocked
1343  * until this is done. See g_dbus_connection_close() for the
1344  * asynchronous version of this method and more details about what it
1345  * does.
1346  *
1347  * Returns: %TRUE if the operation succeeded, %FALSE if @error is set.
1348  *
1349  * Since: 2.26
1350  */
1351 gboolean
1352 g_dbus_connection_close_sync (GDBusConnection     *connection,
1353                               GCancellable        *cancellable,
1354                               GError             **error)
1355 {
1356   gboolean ret;
1357
1358   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1359   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1360
1361   ret = FALSE;
1362
1363   CONNECTION_LOCK (connection);
1364   if (!connection->closed)
1365     {
1366       ret = g_io_stream_close (connection->stream,
1367                                cancellable,
1368                                error);
1369       if (ret)
1370         set_closed_unlocked (connection, FALSE, NULL);
1371     }
1372   else
1373     {
1374       g_set_error_literal (error,
1375                            G_IO_ERROR,
1376                            G_IO_ERROR_CLOSED,
1377                            _("The connection is closed"));
1378     }
1379   CONNECTION_UNLOCK (connection);
1380
1381   return ret;
1382 }
1383
1384 /* ---------------------------------------------------------------------------------------------------- */
1385
1386 static gboolean
1387 g_dbus_connection_send_message_unlocked (GDBusConnection   *connection,
1388                                          GDBusMessage      *message,
1389                                          GDBusSendMessageFlags flags,
1390                                          volatile guint32  *out_serial,
1391                                          GError           **error)
1392 {
1393   guchar *blob;
1394   gsize blob_size;
1395   guint32 serial_to_use;
1396   gboolean ret;
1397
1398   CONNECTION_ENSURE_LOCK (connection);
1399
1400   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1401   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
1402
1403   /* TODO: check all necessary headers are present */
1404
1405   ret = FALSE;
1406   blob = NULL;
1407
1408   if (out_serial != NULL)
1409     *out_serial = 0;
1410
1411   if (connection->closed)
1412     {
1413       g_set_error_literal (error,
1414                            G_IO_ERROR,
1415                            G_IO_ERROR_CLOSED,
1416                            _("The connection is closed"));
1417       goto out;
1418     }
1419
1420   blob = g_dbus_message_to_blob (message,
1421                                  &blob_size,
1422                                  connection->capabilities,
1423                                  error);
1424   if (blob == NULL)
1425     goto out;
1426
1427   if (flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL)
1428     serial_to_use = g_dbus_message_get_serial (message);
1429   else
1430     serial_to_use = ++connection->last_serial; /* TODO: handle overflow */
1431
1432   switch (blob[0])
1433     {
1434     case 'l':
1435       ((guint32 *) blob)[2] = GUINT32_TO_LE (serial_to_use);
1436       break;
1437     case 'B':
1438       ((guint32 *) blob)[2] = GUINT32_TO_BE (serial_to_use);
1439       break;
1440     default:
1441       g_assert_not_reached ();
1442       break;
1443     }
1444
1445 #if 0
1446   g_printerr ("Writing message of %" G_GSIZE_FORMAT " bytes (serial %d) on %p:\n",
1447               blob_size, serial_to_use, connection);
1448   g_printerr ("----\n");
1449   hexdump (blob, blob_size);
1450   g_printerr ("----\n");
1451 #endif
1452
1453   /* TODO: use connection->auth to encode the blob */
1454
1455   if (out_serial != NULL)
1456     *out_serial = serial_to_use;
1457
1458   if (!(flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL))
1459     g_dbus_message_set_serial (message, serial_to_use);
1460
1461   g_dbus_message_lock (message);
1462   _g_dbus_worker_send_message (connection->worker,
1463                                message,
1464                                (gchar*) blob,
1465                                blob_size);
1466   blob = NULL; /* since _g_dbus_worker_send_message() steals the blob */
1467
1468   ret = TRUE;
1469
1470  out:
1471   g_free (blob);
1472
1473   return ret;
1474 }
1475
1476 /**
1477  * g_dbus_connection_send_message:
1478  * @connection: A #GDBusConnection.
1479  * @message: A #GDBusMessage
1480  * @flags: Flags affecting how the message is sent.
1481  * @out_serial: (out) (allow-none): Return location for serial number assigned
1482  *              to @message when sending it or %NULL.
1483  * @error: Return location for error or %NULL.
1484  *
1485  * Asynchronously sends @message to the peer represented by @connection.
1486  *
1487  * Unless @flags contain the
1488  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
1489  * will be assigned by @connection and set on @message via
1490  * g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
1491  * serial number used will be written to this location prior to
1492  * submitting the message to the underlying transport.
1493  *
1494  * If @connection is closed then the operation will fail with
1495  * %G_IO_ERROR_CLOSED. If @message is not well-formed,
1496  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1497  *
1498  * See <xref linkend="gdbus-server"/> and <xref
1499  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1500  * low-level API to send and receive UNIX file descriptors.
1501  *
1502  * Note that @message must be unlocked, unless @flags contain the
1503  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
1504  *
1505  * Returns: %TRUE if the message was well-formed and queued for
1506  * transmission, %FALSE if @error is set.
1507  *
1508  * Since: 2.26
1509  */
1510 gboolean
1511 g_dbus_connection_send_message (GDBusConnection   *connection,
1512                                 GDBusMessage      *message,
1513                                 GDBusSendMessageFlags flags,
1514                                 volatile guint32  *out_serial,
1515                                 GError           **error)
1516 {
1517   gboolean ret;
1518
1519   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
1520   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
1521   g_return_val_if_fail ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (message), FALSE);
1522   g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
1523
1524   CONNECTION_LOCK (connection);
1525   ret = g_dbus_connection_send_message_unlocked (connection, message, flags, out_serial, error);
1526   CONNECTION_UNLOCK (connection);
1527   return ret;
1528 }
1529
1530 /* ---------------------------------------------------------------------------------------------------- */
1531
1532 typedef struct
1533 {
1534   volatile gint ref_count;
1535   GDBusConnection *connection;
1536   guint32 serial;
1537   GSimpleAsyncResult *simple;
1538
1539   GMainContext *main_context;
1540
1541   GCancellable *cancellable;
1542
1543   gulong cancellable_handler_id;
1544
1545   GSource *timeout_source;
1546
1547   gboolean delivered;
1548 } SendMessageData;
1549
1550 static SendMessageData *
1551 send_message_data_ref (SendMessageData *data)
1552 {
1553   g_atomic_int_inc (&data->ref_count);
1554   return data;
1555 }
1556
1557 static void
1558 send_message_data_unref (SendMessageData *data)
1559 {
1560   if (g_atomic_int_dec_and_test (&data->ref_count))
1561     {
1562       g_assert (data->timeout_source == NULL);
1563       g_assert (data->simple == NULL);
1564       g_assert (data->cancellable_handler_id == 0);
1565       g_object_unref (data->connection);
1566       if (data->cancellable != NULL)
1567         g_object_unref (data->cancellable);
1568       if (data->main_context != NULL)
1569         g_main_context_unref (data->main_context);
1570       g_free (data);
1571     }
1572 }
1573
1574 /* ---------------------------------------------------------------------------------------------------- */
1575
1576 /* can be called from any thread with lock held - caller must have prepared GSimpleAsyncResult already */
1577 static void
1578 send_message_with_reply_deliver (SendMessageData *data)
1579 {
1580   CONNECTION_ENSURE_LOCK (data->connection);
1581
1582   g_assert (!data->delivered);
1583
1584   data->delivered = TRUE;
1585
1586   g_simple_async_result_complete_in_idle (data->simple);
1587   g_object_unref (data->simple);
1588   data->simple = NULL;
1589
1590   if (data->timeout_source != NULL)
1591     {
1592       g_source_destroy (data->timeout_source);
1593       data->timeout_source = NULL;
1594     }
1595   if (data->cancellable_handler_id > 0)
1596     {
1597       g_cancellable_disconnect (data->cancellable, data->cancellable_handler_id);
1598       data->cancellable_handler_id = 0;
1599     }
1600
1601   g_warn_if_fail (g_hash_table_remove (data->connection->map_method_serial_to_send_message_data,
1602                                        GUINT_TO_POINTER (data->serial)));
1603
1604   send_message_data_unref (data);
1605 }
1606
1607 /* ---------------------------------------------------------------------------------------------------- */
1608
1609 /* must hold lock */
1610 static void
1611 send_message_data_deliver_reply_unlocked (SendMessageData *data,
1612                                           GDBusMessage    *reply)
1613 {
1614   if (data->delivered)
1615     goto out;
1616
1617   g_simple_async_result_set_op_res_gpointer (data->simple,
1618                                              g_object_ref (reply),
1619                                              g_object_unref);
1620
1621   send_message_with_reply_deliver (data);
1622
1623  out:
1624   ;
1625 }
1626
1627 /* ---------------------------------------------------------------------------------------------------- */
1628
1629 static gboolean
1630 send_message_with_reply_cancelled_idle_cb (gpointer user_data)
1631 {
1632   SendMessageData *data = user_data;
1633
1634   CONNECTION_LOCK (data->connection);
1635   if (data->delivered)
1636     goto out;
1637
1638   g_simple_async_result_set_error (data->simple,
1639                                    G_IO_ERROR,
1640                                    G_IO_ERROR_CANCELLED,
1641                                    _("Operation was cancelled"));
1642
1643   send_message_with_reply_deliver (data);
1644
1645  out:
1646   CONNECTION_UNLOCK (data->connection);
1647   return FALSE;
1648 }
1649
1650 /* Can be called from any thread with or without lock held */
1651 static void
1652 send_message_with_reply_cancelled_cb (GCancellable *cancellable,
1653                                       gpointer      user_data)
1654 {
1655   SendMessageData *data = user_data;
1656   GSource *idle_source;
1657
1658   /* postpone cancellation to idle handler since we may be called directly
1659    * via g_cancellable_connect() (e.g. holding lock)
1660    */
1661   idle_source = g_idle_source_new ();
1662   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1663   g_source_set_callback (idle_source,
1664                          send_message_with_reply_cancelled_idle_cb,
1665                          send_message_data_ref (data),
1666                          (GDestroyNotify) send_message_data_unref);
1667   g_source_attach (idle_source, data->main_context);
1668   g_source_unref (idle_source);
1669 }
1670
1671 /* ---------------------------------------------------------------------------------------------------- */
1672
1673 static gboolean
1674 send_message_with_reply_timeout_cb (gpointer user_data)
1675 {
1676   SendMessageData *data = user_data;
1677
1678   CONNECTION_LOCK (data->connection);
1679   if (data->delivered)
1680     goto out;
1681
1682   g_simple_async_result_set_error (data->simple,
1683                                    G_IO_ERROR,
1684                                    G_IO_ERROR_TIMED_OUT,
1685                                    _("Timeout was reached"));
1686
1687   send_message_with_reply_deliver (data);
1688
1689  out:
1690   CONNECTION_UNLOCK (data->connection);
1691
1692   return FALSE;
1693 }
1694
1695 /* ---------------------------------------------------------------------------------------------------- */
1696
1697 static void
1698 g_dbus_connection_send_message_with_reply_unlocked (GDBusConnection     *connection,
1699                                                     GDBusMessage        *message,
1700                                                     GDBusSendMessageFlags flags,
1701                                                     gint                 timeout_msec,
1702                                                     volatile guint32    *out_serial,
1703                                                     GCancellable        *cancellable,
1704                                                     GAsyncReadyCallback  callback,
1705                                                     gpointer             user_data)
1706 {
1707   GSimpleAsyncResult *simple;
1708   SendMessageData *data;
1709   GError *error;
1710   volatile guint32 serial;
1711
1712   data = NULL;
1713
1714   if (out_serial == NULL)
1715     out_serial = &serial;
1716
1717   if (timeout_msec == -1)
1718     timeout_msec = 25 * 1000;
1719
1720   simple = g_simple_async_result_new (G_OBJECT (connection),
1721                                       callback,
1722                                       user_data,
1723                                       g_dbus_connection_send_message_with_reply);
1724
1725   if (g_cancellable_is_cancelled (cancellable))
1726     {
1727       g_simple_async_result_set_error (simple,
1728                                        G_IO_ERROR,
1729                                        G_IO_ERROR_CANCELLED,
1730                                        _("Operation was cancelled"));
1731       g_simple_async_result_complete_in_idle (simple);
1732       g_object_unref (simple);
1733       goto out;
1734     }
1735
1736   if (connection->closed)
1737     {
1738       g_simple_async_result_set_error (simple,
1739                                        G_IO_ERROR,
1740                                        G_IO_ERROR_CLOSED,
1741                                        _("The connection is closed"));
1742       g_simple_async_result_complete_in_idle (simple);
1743       g_object_unref (simple);
1744       goto out;
1745     }
1746
1747   error = NULL;
1748   if (!g_dbus_connection_send_message_unlocked (connection, message, flags, out_serial, &error))
1749     {
1750       g_simple_async_result_take_error (simple, error);
1751       g_simple_async_result_complete_in_idle (simple);
1752       g_object_unref (simple);
1753       goto out;
1754     }
1755
1756   data = g_new0 (SendMessageData, 1);
1757   data->ref_count = 1;
1758   data->connection = g_object_ref (connection);
1759   data->simple = simple;
1760   data->serial = *out_serial;
1761   data->main_context = g_main_context_get_thread_default ();
1762   if (data->main_context != NULL)
1763     g_main_context_ref (data->main_context);
1764
1765   if (cancellable != NULL)
1766     {
1767       data->cancellable = g_object_ref (cancellable);
1768       data->cancellable_handler_id = g_cancellable_connect (cancellable,
1769                                                             G_CALLBACK (send_message_with_reply_cancelled_cb),
1770                                                             send_message_data_ref (data),
1771                                                             (GDestroyNotify) send_message_data_unref);
1772       g_object_set_data_full (G_OBJECT (simple),
1773                               "cancellable",
1774                               g_object_ref (cancellable),
1775                               (GDestroyNotify) g_object_unref);
1776     }
1777
1778   if (timeout_msec != G_MAXINT)
1779     {
1780       data->timeout_source = g_timeout_source_new (timeout_msec);
1781       g_source_set_priority (data->timeout_source, G_PRIORITY_DEFAULT);
1782       g_source_set_callback (data->timeout_source,
1783                              send_message_with_reply_timeout_cb,
1784                              send_message_data_ref (data),
1785                              (GDestroyNotify) send_message_data_unref);
1786       g_source_attach (data->timeout_source, data->main_context);
1787       g_source_unref (data->timeout_source);
1788     }
1789
1790   g_hash_table_insert (connection->map_method_serial_to_send_message_data,
1791                        GUINT_TO_POINTER (*out_serial),
1792                        data);
1793
1794  out:
1795   ;
1796 }
1797
1798 /**
1799  * g_dbus_connection_send_message_with_reply:
1800  * @connection: A #GDBusConnection.
1801  * @message: A #GDBusMessage.
1802  * @flags: Flags affecting how the message is sent.
1803  * @timeout_msec: The timeout in milliseconds, -1 to use the default
1804  *                timeout or %G_MAXINT for no timeout.
1805  * @out_serial: (out) (allow-none): Return location for serial number assigned
1806  *              to @message when sending it or %NULL.
1807  * @cancellable: A #GCancellable or %NULL.
1808  * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is
1809  *            satisfied or %NULL if you don't care about the result.
1810  * @user_data: The data to pass to @callback.
1811  *
1812  * Asynchronously sends @message to the peer represented by @connection.
1813  *
1814  * Unless @flags contain the
1815  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
1816  * will be assigned by @connection and set on @message via
1817  * g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
1818  * serial number used will be written to this location prior to
1819  * submitting the message to the underlying transport.
1820  *
1821  * If @connection is closed then the operation will fail with
1822  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
1823  * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
1824  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1825  *
1826  * This is an asynchronous method. When the operation is finished, @callback will be invoked
1827  * in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
1828  * of the thread you are calling this method from. You can then call
1829  * g_dbus_connection_send_message_with_reply_finish() to get the result of the operation.
1830  * See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.
1831  *
1832  * Note that @message must be unlocked, unless @flags contain the
1833  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
1834  *
1835  * See <xref linkend="gdbus-server"/> and <xref
1836  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1837  * low-level API to send and receive UNIX file descriptors.
1838  *
1839  * Since: 2.26
1840  */
1841 void
1842 g_dbus_connection_send_message_with_reply (GDBusConnection     *connection,
1843                                            GDBusMessage        *message,
1844                                            GDBusSendMessageFlags flags,
1845                                            gint                 timeout_msec,
1846                                            volatile guint32    *out_serial,
1847                                            GCancellable        *cancellable,
1848                                            GAsyncReadyCallback  callback,
1849                                            gpointer             user_data)
1850 {
1851   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
1852   g_return_if_fail (G_IS_DBUS_MESSAGE (message));
1853   g_return_if_fail ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (message));
1854   g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
1855
1856   CONNECTION_LOCK (connection);
1857   g_dbus_connection_send_message_with_reply_unlocked (connection,
1858                                                       message,
1859                                                       flags,
1860                                                       timeout_msec,
1861                                                       out_serial,
1862                                                       cancellable,
1863                                                       callback,
1864                                                       user_data);
1865   CONNECTION_UNLOCK (connection);
1866 }
1867
1868 /**
1869  * g_dbus_connection_send_message_with_reply_finish:
1870  * @connection: a #GDBusConnection
1871  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_send_message_with_reply().
1872  * @error: Return location for error or %NULL.
1873  *
1874  * Finishes an operation started with g_dbus_connection_send_message_with_reply().
1875  *
1876  * Note that @error is only set if a local in-process error
1877  * occured. That is to say that the returned #GDBusMessage object may
1878  * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
1879  * g_dbus_message_to_gerror() to transcode this to a #GError.
1880  *
1881  * See <xref linkend="gdbus-server"/> and <xref
1882  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1883  * low-level API to send and receive UNIX file descriptors.
1884  *
1885  * Returns: (transfer full): A locked #GDBusMessage or %NULL if @error is set.
1886  *
1887  * Since: 2.26
1888  */
1889 GDBusMessage *
1890 g_dbus_connection_send_message_with_reply_finish (GDBusConnection  *connection,
1891                                                   GAsyncResult     *res,
1892                                                   GError          **error)
1893 {
1894   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
1895   GDBusMessage *reply;
1896   GCancellable *cancellable;
1897
1898   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
1899   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
1900
1901   reply = NULL;
1902
1903   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_send_message_with_reply);
1904
1905   if (g_simple_async_result_propagate_error (simple, error))
1906     goto out;
1907
1908   reply = g_object_ref (g_simple_async_result_get_op_res_gpointer (simple));
1909   cancellable = g_object_get_data (G_OBJECT (simple), "cancellable");
1910   if (cancellable != NULL && g_cancellable_is_cancelled (cancellable))
1911     {
1912       g_object_unref (reply);
1913       reply = NULL;
1914       g_set_error_literal (error,
1915                            G_IO_ERROR,
1916                            G_IO_ERROR_CANCELLED,
1917                            _("Operation was cancelled"));
1918     }
1919  out:
1920   return reply;
1921 }
1922
1923 /* ---------------------------------------------------------------------------------------------------- */
1924
1925 typedef struct
1926 {
1927   GAsyncResult *res;
1928   GMainContext *context;
1929   GMainLoop *loop;
1930 } SendMessageSyncData;
1931
1932 static void
1933 send_message_with_reply_sync_cb (GDBusConnection *connection,
1934                                  GAsyncResult    *res,
1935                                  gpointer         user_data)
1936 {
1937   SendMessageSyncData *data = user_data;
1938   data->res = g_object_ref (res);
1939   g_main_loop_quit (data->loop);
1940 }
1941
1942 /**
1943  * g_dbus_connection_send_message_with_reply_sync:
1944  * @connection: A #GDBusConnection.
1945  * @message: A #GDBusMessage.
1946  * @flags: Flags affecting how the message is sent.
1947  * @timeout_msec: The timeout in milliseconds, -1 to use the default
1948  *                timeout or %G_MAXINT for no timeout.
1949  * @out_serial: (out) (allow-none): Return location for serial number assigned
1950  *              to @message when sending it or %NULL.
1951  * @cancellable: A #GCancellable or %NULL.
1952  * @error: Return location for error or %NULL.
1953  *
1954  * Synchronously sends @message to the peer represented by @connection
1955  * and blocks the calling thread until a reply is received or the
1956  * timeout is reached. See g_dbus_connection_send_message_with_reply()
1957  * for the asynchronous version of this method.
1958  *
1959  * Unless @flags contain the
1960  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag, the serial number
1961  * will be assigned by @connection and set on @message via
1962  * g_dbus_message_set_serial(). If @out_serial is not %NULL, then the
1963  * serial number used will be written to this location prior to
1964  * submitting the message to the underlying transport.
1965  *
1966  * If @connection is closed then the operation will fail with
1967  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
1968  * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
1969  * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
1970  *
1971  * Note that @error is only set if a local in-process error
1972  * occured. That is to say that the returned #GDBusMessage object may
1973  * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
1974  * g_dbus_message_to_gerror() to transcode this to a #GError.
1975  *
1976  * See <xref linkend="gdbus-server"/> and <xref
1977  * linkend="gdbus-unix-fd-client"/> for an example of how to use this
1978  * low-level API to send and receive UNIX file descriptors.
1979  *
1980  * Note that @message must be unlocked, unless @flags contain the
1981  * %G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL flag.
1982  *
1983  * Returns: (transfer full): A locked #GDBusMessage that is the reply to @message or %NULL if @error is set.
1984  *
1985  * Since: 2.26
1986  */
1987 GDBusMessage *
1988 g_dbus_connection_send_message_with_reply_sync (GDBusConnection   *connection,
1989                                                 GDBusMessage      *message,
1990                                                 GDBusSendMessageFlags flags,
1991                                                 gint               timeout_msec,
1992                                                 volatile guint32  *out_serial,
1993                                                 GCancellable      *cancellable,
1994                                                 GError           **error)
1995 {
1996   SendMessageSyncData *data;
1997   GDBusMessage *reply;
1998
1999   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2000   g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
2001   g_return_val_if_fail ((flags & G_DBUS_SEND_MESSAGE_FLAGS_PRESERVE_SERIAL) || !g_dbus_message_get_locked (message), NULL);
2002   g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
2003   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2004
2005   data = g_new0 (SendMessageSyncData, 1);
2006   data->context = g_main_context_new ();
2007   data->loop = g_main_loop_new (data->context, FALSE);
2008
2009   g_main_context_push_thread_default (data->context);
2010
2011   g_dbus_connection_send_message_with_reply (connection,
2012                                              message,
2013                                              flags,
2014                                              timeout_msec,
2015                                              out_serial,
2016                                              cancellable,
2017                                              (GAsyncReadyCallback) send_message_with_reply_sync_cb,
2018                                              data);
2019   g_main_loop_run (data->loop);
2020   reply = g_dbus_connection_send_message_with_reply_finish (connection,
2021                                                             data->res,
2022                                                             error);
2023
2024   g_main_context_pop_thread_default (data->context);
2025
2026   g_main_context_unref (data->context);
2027   g_main_loop_unref (data->loop);
2028   g_object_unref (data->res);
2029   g_free (data);
2030
2031   return reply;
2032 }
2033
2034 /* ---------------------------------------------------------------------------------------------------- */
2035
2036 typedef struct
2037 {
2038   GDBusMessageFilterFunction func;
2039   gpointer user_data;
2040 } FilterCallback;
2041
2042 typedef struct
2043 {
2044   guint                       id;
2045   GDBusMessageFilterFunction  filter_function;
2046   gpointer                    user_data;
2047   GDestroyNotify              user_data_free_func;
2048 } FilterData;
2049
2050 /* Called in worker's thread - we must not block */
2051 static void
2052 on_worker_message_received (GDBusWorker  *worker,
2053                             GDBusMessage *message,
2054                             gpointer      user_data)
2055 {
2056   GDBusConnection *connection;
2057   FilterCallback *filters;
2058   guint num_filters;
2059   guint n;
2060   gboolean alive;
2061
2062   G_LOCK (message_bus_lock);
2063   alive = (g_hash_table_lookup (alive_connections, user_data) != NULL);
2064   if (!alive)
2065     {
2066       G_UNLOCK (message_bus_lock);
2067       return;
2068     }
2069   connection = G_DBUS_CONNECTION (user_data);
2070   g_object_ref (connection);
2071   G_UNLOCK (message_bus_lock);
2072
2073   //g_debug ("in on_worker_message_received");
2074
2075   g_object_ref (message);
2076   g_dbus_message_lock (message);
2077
2078   //g_debug ("boo ref_count = %d %p %p", G_OBJECT (connection)->ref_count, connection, connection->worker);
2079
2080   /* First collect the set of callback functions */
2081   CONNECTION_LOCK (connection);
2082   num_filters = connection->filters->len;
2083   filters = g_new0 (FilterCallback, num_filters);
2084   for (n = 0; n < num_filters; n++)
2085     {
2086       FilterData *data = connection->filters->pdata[n];
2087       filters[n].func = data->filter_function;
2088       filters[n].user_data = data->user_data;
2089     }
2090   CONNECTION_UNLOCK (connection);
2091
2092   /* then call the filters in order (without holding the lock) */
2093   for (n = 0; n < num_filters; n++)
2094     {
2095       message = filters[n].func (connection,
2096                                  message,
2097                                  TRUE,
2098                                  filters[n].user_data);
2099       if (message == NULL)
2100         break;
2101       g_dbus_message_lock (message);
2102     }
2103
2104   /* Standard dispatch unless the filter ate the message - no need to
2105    * do anything if the message was altered
2106    */
2107   if (message != NULL)
2108     {
2109       GDBusMessageType message_type;
2110
2111       message_type = g_dbus_message_get_message_type (message);
2112       if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_RETURN || message_type == G_DBUS_MESSAGE_TYPE_ERROR)
2113         {
2114           guint32 reply_serial;
2115           SendMessageData *send_message_data;
2116
2117           reply_serial = g_dbus_message_get_reply_serial (message);
2118           CONNECTION_LOCK (connection);
2119           send_message_data = g_hash_table_lookup (connection->map_method_serial_to_send_message_data,
2120                                                    GUINT_TO_POINTER (reply_serial));
2121           if (send_message_data != NULL)
2122             {
2123               //g_debug ("delivering reply/error for serial %d for %p", reply_serial, connection);
2124               send_message_data_deliver_reply_unlocked (send_message_data, message);
2125             }
2126           else
2127             {
2128               //g_debug ("message reply/error for serial %d but no SendMessageData found for %p", reply_serial, connection);
2129             }
2130           CONNECTION_UNLOCK (connection);
2131         }
2132       else if (message_type == G_DBUS_MESSAGE_TYPE_SIGNAL)
2133         {
2134           CONNECTION_LOCK (connection);
2135           distribute_signals (connection, message);
2136           CONNECTION_UNLOCK (connection);
2137         }
2138       else if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_CALL)
2139         {
2140           CONNECTION_LOCK (connection);
2141           distribute_method_call (connection, message);
2142           CONNECTION_UNLOCK (connection);
2143         }
2144     }
2145
2146   if (message != NULL)
2147     g_object_unref (message);
2148   g_object_unref (connection);
2149   g_free (filters);
2150 }
2151
2152 /* Called in worker's thread */
2153 static GDBusMessage *
2154 on_worker_message_about_to_be_sent (GDBusWorker  *worker,
2155                                     GDBusMessage *message,
2156                                     gpointer      user_data)
2157 {
2158   GDBusConnection *connection;
2159   FilterCallback *filters;
2160   guint num_filters;
2161   guint n;
2162   gboolean alive;
2163
2164   G_LOCK (message_bus_lock);
2165   alive = (g_hash_table_lookup (alive_connections, user_data) != NULL);
2166   if (!alive)
2167     {
2168       G_UNLOCK (message_bus_lock);
2169       return message;
2170     }
2171   connection = G_DBUS_CONNECTION (user_data);
2172   g_object_ref (connection);
2173   G_UNLOCK (message_bus_lock);
2174
2175   //g_debug ("in on_worker_message_about_to_be_sent");
2176
2177   /* First collect the set of callback functions */
2178   CONNECTION_LOCK (connection);
2179   num_filters = connection->filters->len;
2180   filters = g_new0 (FilterCallback, num_filters);
2181   for (n = 0; n < num_filters; n++)
2182     {
2183       FilterData *data = connection->filters->pdata[n];
2184       filters[n].func = data->filter_function;
2185       filters[n].user_data = data->user_data;
2186     }
2187   CONNECTION_UNLOCK (connection);
2188
2189   /* then call the filters in order (without holding the lock) */
2190   for (n = 0; n < num_filters; n++)
2191     {
2192       g_dbus_message_lock (message);
2193       message = filters[n].func (connection,
2194                                  message,
2195                                  FALSE,
2196                                  filters[n].user_data);
2197       if (message == NULL)
2198         break;
2199     }
2200
2201   g_object_unref (connection);
2202   g_free (filters);
2203
2204   return message;
2205 }
2206
2207 /* Called in worker's thread - we must not block */
2208 static void
2209 on_worker_closed (GDBusWorker *worker,
2210                   gboolean     remote_peer_vanished,
2211                   GError      *error,
2212                   gpointer     user_data)
2213 {
2214   GDBusConnection *connection;
2215   gboolean alive;
2216
2217   G_LOCK (message_bus_lock);
2218   alive = (g_hash_table_lookup (alive_connections, user_data) != NULL);
2219   if (!alive)
2220     {
2221       G_UNLOCK (message_bus_lock);
2222       return;
2223     }
2224   connection = G_DBUS_CONNECTION (user_data);
2225   g_object_ref (connection);
2226   G_UNLOCK (message_bus_lock);
2227
2228   //g_debug ("in on_worker_closed: %s", error->message);
2229
2230   CONNECTION_LOCK (connection);
2231   if (!connection->closed)
2232     set_closed_unlocked (connection, remote_peer_vanished, error);
2233   CONNECTION_UNLOCK (connection);
2234
2235   g_object_unref (connection);
2236 }
2237
2238 /* ---------------------------------------------------------------------------------------------------- */
2239
2240 /* Determines the biggest set of capabilities we can support on this connection */
2241 static GDBusCapabilityFlags
2242 get_offered_capabilities_max (GDBusConnection *connection)
2243 {
2244       GDBusCapabilityFlags ret;
2245       ret = G_DBUS_CAPABILITY_FLAGS_NONE;
2246 #ifdef G_OS_UNIX
2247       if (G_IS_UNIX_CONNECTION (connection->stream))
2248         ret |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
2249 #endif
2250       return ret;
2251 }
2252
2253 static gboolean
2254 initable_init (GInitable     *initable,
2255                GCancellable  *cancellable,
2256                GError       **error)
2257 {
2258   GDBusConnection *connection = G_DBUS_CONNECTION (initable);
2259   gboolean ret;
2260
2261   /* This method needs to be idempotent to work with the singleton
2262    * pattern. See the docs for g_initable_init(). We implement this by
2263    * locking.
2264    *
2265    * Unfortunately we can't use the main lock since the on_worker_*()
2266    * callbacks above needs the lock during initialization (for message
2267    * bus connections we do a synchronous Hello() call on the bus).
2268    */
2269   g_mutex_lock (connection->init_lock);
2270
2271   ret = FALSE;
2272
2273   /* First, handle the case where the connection already has an
2274    * initialization error set.
2275    */
2276   if (connection->initialization_error != NULL)
2277     goto out;
2278
2279   /* Also make this a no-op if we're already initialized fine */
2280   if (connection->is_initialized)
2281     {
2282       ret = TRUE;
2283       goto out;
2284     }
2285
2286   g_assert (connection->initialization_error == NULL && !connection->is_initialized);
2287
2288   /* The user can pass multiple (but mutally exclusive) construct
2289    * properties:
2290    *
2291    *  - stream (of type GIOStream)
2292    *  - address (of type gchar*)
2293    *
2294    * At the end of the day we end up with a non-NULL GIOStream
2295    * object in connection->stream.
2296    */
2297   if (connection->address != NULL)
2298     {
2299       g_assert (connection->stream == NULL);
2300
2301       if ((connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER) ||
2302           (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS))
2303         {
2304           g_set_error_literal (error,
2305                                G_IO_ERROR,
2306                                G_IO_ERROR_INVALID_ARGUMENT,
2307                                _("Unsupported flags encountered when constructing a client-side connection"));
2308           goto out;
2309         }
2310
2311       connection->stream = g_dbus_address_get_stream_sync (connection->address,
2312                                                            NULL, /* TODO: out_guid */
2313                                                            cancellable,
2314                                                            &connection->initialization_error);
2315       if (connection->stream == NULL)
2316         goto out;
2317     }
2318   else if (connection->stream != NULL)
2319     {
2320       /* nothing to do */
2321     }
2322   else
2323     {
2324       g_assert_not_reached ();
2325     }
2326
2327   /* Authenticate the connection */
2328   if (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER)
2329     {
2330       g_assert (!(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT));
2331       g_assert (connection->guid != NULL);
2332       connection->auth = _g_dbus_auth_new (connection->stream);
2333       if (!_g_dbus_auth_run_server (connection->auth,
2334                                     connection->authentication_observer,
2335                                     connection->guid,
2336                                     (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS),
2337                                     get_offered_capabilities_max (connection),
2338                                     &connection->capabilities,
2339                                     &connection->credentials,
2340                                     cancellable,
2341                                     &connection->initialization_error))
2342         goto out;
2343     }
2344   else if (connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT)
2345     {
2346       g_assert (!(connection->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER));
2347       g_assert (connection->guid == NULL);
2348       connection->auth = _g_dbus_auth_new (connection->stream);
2349       connection->guid = _g_dbus_auth_run_client (connection->auth,
2350                                                   get_offered_capabilities_max (connection),
2351                                                   &connection->capabilities,
2352                                                   cancellable,
2353                                                   &connection->initialization_error);
2354       if (connection->guid == NULL)
2355         goto out;
2356     }
2357
2358   if (connection->authentication_observer != NULL)
2359     {
2360       g_object_unref (connection->authentication_observer);
2361       connection->authentication_observer = NULL;
2362     }
2363
2364   //g_output_stream_flush (G_SOCKET_CONNECTION (connection->stream)
2365
2366   //g_debug ("haz unix fd passing powers: %d", connection->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING);
2367
2368 #ifdef G_OS_UNIX
2369   /* We want all IO operations to be non-blocking since they happen in
2370    * the worker thread which is shared by _all_ connections.
2371    */
2372   if (G_IS_SOCKET_CONNECTION (connection->stream))
2373     {
2374       g_socket_set_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (connection->stream)), FALSE);
2375     }
2376 #endif
2377
2378   G_LOCK (message_bus_lock);
2379   if (alive_connections == NULL)
2380     alive_connections = g_hash_table_new (g_direct_hash, g_direct_equal);
2381   g_hash_table_insert (alive_connections, connection, connection);
2382   G_UNLOCK (message_bus_lock);
2383
2384   connection->worker = _g_dbus_worker_new (connection->stream,
2385                                            connection->capabilities,
2386                                            (connection->flags & G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING),
2387                                            on_worker_message_received,
2388                                            on_worker_message_about_to_be_sent,
2389                                            on_worker_closed,
2390                                            connection);
2391
2392   /* if a bus connection, call org.freedesktop.DBus.Hello - this is how we're getting a name */
2393   if (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
2394     {
2395       GVariant *hello_result;
2396
2397       /* we could lift this restriction by adding code in gdbusprivate.c */
2398       if (connection->flags & G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING)
2399         {
2400           g_set_error_literal (&connection->initialization_error,
2401                                G_IO_ERROR,
2402                                G_IO_ERROR_FAILED,
2403                                "Cannot use DELAY_MESSAGE_PROCESSING with MESSAGE_BUS_CONNECTION");
2404           goto out;
2405         }
2406
2407       hello_result = g_dbus_connection_call_sync (connection,
2408                                                   "org.freedesktop.DBus", /* name */
2409                                                   "/org/freedesktop/DBus", /* path */
2410                                                   "org.freedesktop.DBus", /* interface */
2411                                                   "Hello",
2412                                                   NULL, /* parameters */
2413                                                   G_VARIANT_TYPE ("(s)"),
2414                                                   G_DBUS_CALL_FLAGS_NONE,
2415                                                   -1,
2416                                                   NULL, /* TODO: cancellable */
2417                                                   &connection->initialization_error);
2418       if (hello_result == NULL)
2419         goto out;
2420
2421       g_variant_get (hello_result, "(s)", &connection->bus_unique_name);
2422       g_variant_unref (hello_result);
2423       //g_debug ("unique name is `%s'", connection->bus_unique_name);
2424     }
2425
2426   connection->is_initialized = TRUE;
2427
2428   ret = TRUE;
2429  out:
2430   if (!ret)
2431     {
2432       g_assert (connection->initialization_error != NULL);
2433       g_propagate_error (error, g_error_copy (connection->initialization_error));
2434     }
2435
2436   g_mutex_unlock (connection->init_lock);
2437
2438   return ret;
2439 }
2440
2441 static void
2442 initable_iface_init (GInitableIface *initable_iface)
2443 {
2444   initable_iface->init = initable_init;
2445 }
2446
2447 /* ---------------------------------------------------------------------------------------------------- */
2448
2449 static void
2450 async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
2451 {
2452   /* Use default */
2453 }
2454
2455 /* ---------------------------------------------------------------------------------------------------- */
2456
2457 /**
2458  * g_dbus_connection_new:
2459  * @stream: A #GIOStream.
2460  * @guid: (allow-none): The GUID to use if a authenticating as a server or %NULL.
2461  * @flags: Flags describing how to make the connection.
2462  * @observer: (allow-none): A #GDBusAuthObserver or %NULL.
2463  * @cancellable: A #GCancellable or %NULL.
2464  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
2465  * @user_data: The data to pass to @callback.
2466  *
2467  * Asynchronously sets up a D-Bus connection for exchanging D-Bus messages
2468  * with the end represented by @stream.
2469  *
2470  * If @stream is a #GSocketConnection, then the corresponding #GSocket
2471  * will be put into non-blocking mode.
2472  *
2473  * If @observer is not %NULL it may be used to control the
2474  * authentication process.
2475  *
2476  * When the operation is finished, @callback will be invoked. You can
2477  * then call g_dbus_connection_new_finish() to get the result of the
2478  * operation.
2479  *
2480  * This is a asynchronous failable constructor. See
2481  * g_dbus_connection_new_sync() for the synchronous
2482  * version.
2483  *
2484  * Since: 2.26
2485  */
2486 void
2487 g_dbus_connection_new (GIOStream            *stream,
2488                        const gchar          *guid,
2489                        GDBusConnectionFlags  flags,
2490                        GDBusAuthObserver    *observer,
2491                        GCancellable         *cancellable,
2492                        GAsyncReadyCallback   callback,
2493                        gpointer              user_data)
2494 {
2495   g_return_if_fail (G_IS_IO_STREAM (stream));
2496   g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
2497                               G_PRIORITY_DEFAULT,
2498                               cancellable,
2499                               callback,
2500                               user_data,
2501                               "stream", stream,
2502                               "guid", guid,
2503                               "flags", flags,
2504                               "authentication-observer", observer,
2505                               NULL);
2506 }
2507
2508 /**
2509  * g_dbus_connection_new_finish:
2510  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
2511  * @error: Return location for error or %NULL.
2512  *
2513  * Finishes an operation started with g_dbus_connection_new().
2514  *
2515  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2516  *
2517  * Since: 2.26
2518  */
2519 GDBusConnection *
2520 g_dbus_connection_new_finish (GAsyncResult  *res,
2521                               GError       **error)
2522 {
2523   GObject *object;
2524   GObject *source_object;
2525
2526   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
2527   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2528
2529   source_object = g_async_result_get_source_object (res);
2530   g_assert (source_object != NULL);
2531   object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
2532                                         res,
2533                                         error);
2534   g_object_unref (source_object);
2535   if (object != NULL)
2536     return G_DBUS_CONNECTION (object);
2537   else
2538     return NULL;
2539 }
2540
2541 /**
2542  * g_dbus_connection_new_sync:
2543  * @stream: A #GIOStream.
2544  * @guid: (allow-none): The GUID to use if a authenticating as a server or %NULL.
2545  * @flags: Flags describing how to make the connection.
2546  * @observer: (allow-none): A #GDBusAuthObserver or %NULL.
2547  * @cancellable: A #GCancellable or %NULL.
2548  * @error: Return location for error or %NULL.
2549  *
2550  * Synchronously sets up a D-Bus connection for exchanging D-Bus messages
2551  * with the end represented by @stream.
2552  *
2553  * If @stream is a #GSocketConnection, then the corresponding #GSocket
2554  * will be put into non-blocking mode.
2555  *
2556  * If @observer is not %NULL it may be used to control the
2557  * authentication process.
2558  *
2559  * This is a synchronous failable constructor. See
2560  * g_dbus_connection_new() for the asynchronous version.
2561  *
2562  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2563  *
2564  * Since: 2.26
2565  */
2566 GDBusConnection *
2567 g_dbus_connection_new_sync (GIOStream             *stream,
2568                             const gchar           *guid,
2569                             GDBusConnectionFlags   flags,
2570                             GDBusAuthObserver     *observer,
2571                             GCancellable          *cancellable,
2572                             GError               **error)
2573 {
2574   g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
2575   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2576   return g_initable_new (G_TYPE_DBUS_CONNECTION,
2577                          cancellable,
2578                          error,
2579                          "stream", stream,
2580                          "guid", guid,
2581                          "flags", flags,
2582                          "authentication-observer", observer,
2583                          NULL);
2584 }
2585
2586 /* ---------------------------------------------------------------------------------------------------- */
2587
2588 /**
2589  * g_dbus_connection_new_for_address:
2590  * @address: A D-Bus address.
2591  * @flags: Flags describing how to make the connection.
2592  * @observer: (allow-none): A #GDBusAuthObserver or %NULL.
2593  * @cancellable: A #GCancellable or %NULL.
2594  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
2595  * @user_data: The data to pass to @callback.
2596  *
2597  * Asynchronously connects and sets up a D-Bus client connection for
2598  * exchanging D-Bus messages with an endpoint specified by @address
2599  * which must be in the D-Bus address format.
2600  *
2601  * This constructor can only be used to initiate client-side
2602  * connections - use g_dbus_connection_new() if you need to act as the
2603  * server. In particular, @flags cannot contain the
2604  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
2605  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
2606  *
2607  * When the operation is finished, @callback will be invoked. You can
2608  * then call g_dbus_connection_new_finish() to get the result of the
2609  * operation.
2610  *
2611  * If @observer is not %NULL it may be used to control the
2612  * authentication process.
2613  *
2614  * This is a asynchronous failable constructor. See
2615  * g_dbus_connection_new_for_address_sync() for the synchronous
2616  * version.
2617  *
2618  * Since: 2.26
2619  */
2620 void
2621 g_dbus_connection_new_for_address (const gchar          *address,
2622                                    GDBusConnectionFlags  flags,
2623                                    GDBusAuthObserver    *observer,
2624                                    GCancellable         *cancellable,
2625                                    GAsyncReadyCallback   callback,
2626                                    gpointer              user_data)
2627 {
2628   g_return_if_fail (address != NULL);
2629   g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
2630                               G_PRIORITY_DEFAULT,
2631                               cancellable,
2632                               callback,
2633                               user_data,
2634                               "address", address,
2635                               "flags", flags,
2636                               "authentication-observer", observer,
2637                               NULL);
2638 }
2639
2640 /**
2641  * g_dbus_connection_new_for_address_finish:
2642  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
2643  * @error: Return location for error or %NULL.
2644  *
2645  * Finishes an operation started with g_dbus_connection_new_for_address().
2646  *
2647  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2648  *
2649  * Since: 2.26
2650  */
2651 GDBusConnection *
2652 g_dbus_connection_new_for_address_finish (GAsyncResult  *res,
2653                                           GError       **error)
2654 {
2655   GObject *object;
2656   GObject *source_object;
2657
2658   g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
2659   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2660
2661   source_object = g_async_result_get_source_object (res);
2662   g_assert (source_object != NULL);
2663   object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
2664                                         res,
2665                                         error);
2666   g_object_unref (source_object);
2667   if (object != NULL)
2668     return G_DBUS_CONNECTION (object);
2669   else
2670     return NULL;
2671 }
2672
2673 /**
2674  * g_dbus_connection_new_for_address_sync:
2675  * @address: A D-Bus address.
2676  * @flags: Flags describing how to make the connection.
2677  * @observer: (allow-none): A #GDBusAuthObserver or %NULL.
2678  * @cancellable: A #GCancellable or %NULL.
2679  * @error: Return location for error or %NULL.
2680  *
2681  * Synchronously connects and sets up a D-Bus client connection for
2682  * exchanging D-Bus messages with an endpoint specified by @address
2683  * which must be in the D-Bus address format.
2684  *
2685  * This constructor can only be used to initiate client-side
2686  * connections - use g_dbus_connection_new_sync() if you need to act
2687  * as the server. In particular, @flags cannot contain the
2688  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
2689  * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
2690  *
2691  * This is a synchronous failable constructor. See
2692  * g_dbus_connection_new_for_address() for the asynchronous version.
2693  *
2694  * If @observer is not %NULL it may be used to control the
2695  * authentication process.
2696  *
2697  * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2698  *
2699  * Since: 2.26
2700  */
2701 GDBusConnection *
2702 g_dbus_connection_new_for_address_sync (const gchar           *address,
2703                                         GDBusConnectionFlags   flags,
2704                                         GDBusAuthObserver     *observer,
2705                                         GCancellable          *cancellable,
2706                                         GError               **error)
2707 {
2708   g_return_val_if_fail (address != NULL, NULL);
2709   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
2710   return g_initable_new (G_TYPE_DBUS_CONNECTION,
2711                          cancellable,
2712                          error,
2713                          "address", address,
2714                          "flags", flags,
2715                          "authentication-observer", observer,
2716                          NULL);
2717 }
2718
2719 /* ---------------------------------------------------------------------------------------------------- */
2720
2721 /**
2722  * g_dbus_connection_set_exit_on_close:
2723  * @connection: A #GDBusConnection.
2724  * @exit_on_close: Whether the process should be terminated
2725  *     when @connection is closed by the remote peer.
2726  *
2727  * Sets whether the process should be terminated when @connection is
2728  * closed by the remote peer. See #GDBusConnection:exit-on-close for
2729  * more details.
2730  *
2731  * Note that this function should be used with care. Most modern UNIX
2732  * desktops tie the notion of a user session the session bus, and expect
2733  * all of a users applications to quit when their bus connection goes away.
2734  * If you are setting @exit_on_close to %FALSE for the shared session
2735  * bus connection, you should make sure that your application exits
2736  * when the user session ends.
2737  *
2738  * Since: 2.26
2739  */
2740 void
2741 g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
2742                                      gboolean         exit_on_close)
2743 {
2744   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
2745   connection->exit_on_close = exit_on_close;
2746 }
2747
2748 /**
2749  * g_dbus_connection_get_exit_on_close:
2750  * @connection: A #GDBusConnection.
2751  *
2752  * Gets whether the process is terminated when @connection is
2753  * closed by the remote peer. See
2754  * #GDBusConnection:exit-on-close for more details.
2755  *
2756  * Returns: Whether the process is terminated when @connection is
2757  * closed by the remote peer.
2758  *
2759  * Since: 2.26
2760  */
2761 gboolean
2762 g_dbus_connection_get_exit_on_close (GDBusConnection *connection)
2763 {
2764   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
2765   return connection->exit_on_close;
2766 }
2767
2768 /**
2769  * g_dbus_connection_get_guid:
2770  * @connection: A #GDBusConnection.
2771  *
2772  * The GUID of the peer performing the role of server when
2773  * authenticating. See #GDBusConnection:guid for more details.
2774  *
2775  * Returns: The GUID. Do not free this string, it is owned by
2776  * @connection.
2777  *
2778  * Since: 2.26
2779  */
2780 const gchar *
2781 g_dbus_connection_get_guid (GDBusConnection *connection)
2782 {
2783   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2784   return connection->guid;
2785 }
2786
2787 /**
2788  * g_dbus_connection_get_unique_name:
2789  * @connection: A #GDBusConnection.
2790  *
2791  * Gets the unique name of @connection as assigned by the message
2792  * bus. This can also be used to figure out if @connection is a
2793  * message bus connection.
2794  *
2795  * Returns: The unique name or %NULL if @connection is not a message
2796  * bus connection. Do not free this string, it is owned by
2797  * @connection.
2798  *
2799  * Since: 2.26
2800  */
2801 const gchar *
2802 g_dbus_connection_get_unique_name (GDBusConnection *connection)
2803 {
2804   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2805   return connection->bus_unique_name;
2806 }
2807
2808 /**
2809  * g_dbus_connection_get_peer_credentials:
2810  * @connection: A #GDBusConnection.
2811  *
2812  * Gets the credentials of the authenticated peer. This will always
2813  * return %NULL unless @connection acted as a server
2814  * (e.g. %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER was passed)
2815  * when set up and the client passed credentials as part of the
2816  * authentication process.
2817  *
2818  * In a message bus setup, the message bus is always the server and
2819  * each application is a client. So this method will always return
2820  * %NULL for message bus clients.
2821  *
2822  * Returns: (transfer none): A #GCredentials or %NULL if not available. Do not free
2823  * this object, it is owned by @connection.
2824  *
2825  * Since: 2.26
2826  */
2827 GCredentials *
2828 g_dbus_connection_get_peer_credentials (GDBusConnection *connection)
2829 {
2830   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
2831   return connection->credentials;
2832 }
2833
2834 /* ---------------------------------------------------------------------------------------------------- */
2835
2836 static guint _global_filter_id = 1;
2837
2838 /**
2839  * g_dbus_connection_add_filter:
2840  * @connection: A #GDBusConnection.
2841  * @filter_function: A filter function.
2842  * @user_data: User data to pass to @filter_function.
2843  * @user_data_free_func: Function to free @user_data with when filter
2844  * is removed or %NULL.
2845  *
2846  * Adds a message filter. Filters are handlers that are run on all
2847  * incoming and outgoing messages, prior to standard dispatch. Filters
2848  * are run in the order that they were added.  The same handler can be
2849  * added as a filter more than once, in which case it will be run more
2850  * than once.  Filters added during a filter callback won't be run on
2851  * the message being processed. Filter functions are allowed to modify
2852  * and even drop messages.
2853  *
2854  * Note that filters are run in a dedicated message handling thread so
2855  * they can't block and, generally, can't do anything but signal a
2856  * worker thread. Also note that filters are rarely needed - use API
2857  * such as g_dbus_connection_send_message_with_reply(),
2858  * g_dbus_connection_signal_subscribe() or g_dbus_connection_call() instead.
2859  *
2860  * If a filter consumes an incoming message the message is not
2861  * dispatched anywhere else - not even the standard dispatch machinery
2862  * (that API such as g_dbus_connection_signal_subscribe() and
2863  * g_dbus_connection_send_message_with_reply() relies on) will see the
2864  * message. Similary, if a filter consumes an outgoing message, the
2865  * message will not be sent to the other peer.
2866  *
2867  * Returns: A filter identifier that can be used with
2868  * g_dbus_connection_remove_filter().
2869  *
2870  * Since: 2.26
2871  */
2872 guint
2873 g_dbus_connection_add_filter (GDBusConnection            *connection,
2874                               GDBusMessageFilterFunction  filter_function,
2875                               gpointer                    user_data,
2876                               GDestroyNotify              user_data_free_func)
2877 {
2878   FilterData *data;
2879
2880   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
2881   g_return_val_if_fail (filter_function != NULL, 0);
2882
2883   CONNECTION_LOCK (connection);
2884   data = g_new0 (FilterData, 1);
2885   data->id = _global_filter_id++; /* TODO: overflow etc. */
2886   data->filter_function = filter_function;
2887   data->user_data = user_data;
2888   data->user_data_free_func = user_data_free_func;
2889   g_ptr_array_add (connection->filters, data);
2890   CONNECTION_UNLOCK (connection);
2891
2892   return data->id;
2893 }
2894
2895 /* only called from finalize(), removes all filters */
2896 static void
2897 purge_all_filters (GDBusConnection *connection)
2898 {
2899   guint n;
2900   for (n = 0; n < connection->filters->len; n++)
2901     {
2902       FilterData *data = connection->filters->pdata[n];
2903       if (data->user_data_free_func != NULL)
2904         data->user_data_free_func (data->user_data);
2905       g_free (data);
2906     }
2907 }
2908
2909 /**
2910  * g_dbus_connection_remove_filter:
2911  * @connection: a #GDBusConnection
2912  * @filter_id: an identifier obtained from g_dbus_connection_add_filter()
2913  *
2914  * Removes a filter.
2915  *
2916  * Since: 2.26
2917  */
2918 void
2919 g_dbus_connection_remove_filter (GDBusConnection *connection,
2920                                  guint            filter_id)
2921 {
2922   guint n;
2923   FilterData *to_destroy;
2924
2925   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
2926
2927   CONNECTION_LOCK (connection);
2928   to_destroy = NULL;
2929   for (n = 0; n < connection->filters->len; n++)
2930     {
2931       FilterData *data = connection->filters->pdata[n];
2932       if (data->id == filter_id)
2933         {
2934           g_ptr_array_remove_index (connection->filters, n);
2935           to_destroy = data;
2936           break;
2937         }
2938     }
2939   CONNECTION_UNLOCK (connection);
2940
2941   /* do free without holding lock */
2942   if (to_destroy != NULL)
2943     {
2944       if (to_destroy->user_data_free_func != NULL)
2945         to_destroy->user_data_free_func (to_destroy->user_data);
2946       g_free (to_destroy);
2947     }
2948   else
2949     {
2950       g_warning ("g_dbus_connection_remove_filter: No filter found for filter_id %d", filter_id);
2951     }
2952 }
2953
2954 /* ---------------------------------------------------------------------------------------------------- */
2955
2956 typedef struct
2957 {
2958   gchar *rule;
2959   gchar *sender;
2960   gchar *sender_unique_name; /* if sender is unique or org.freedesktop.DBus, then that name... otherwise blank */
2961   gchar *interface_name;
2962   gchar *member;
2963   gchar *object_path;
2964   gchar *arg0;
2965   GArray *subscribers;
2966 } SignalData;
2967
2968 typedef struct
2969 {
2970   GDBusSignalCallback callback;
2971   gpointer user_data;
2972   GDestroyNotify user_data_free_func;
2973   guint id;
2974   GMainContext *context;
2975 } SignalSubscriber;
2976
2977 static void
2978 signal_data_free (SignalData *signal_data)
2979 {
2980   g_free (signal_data->rule);
2981   g_free (signal_data->sender);
2982   g_free (signal_data->sender_unique_name);
2983   g_free (signal_data->interface_name);
2984   g_free (signal_data->member);
2985   g_free (signal_data->object_path);
2986   g_free (signal_data->arg0);
2987   g_array_free (signal_data->subscribers, TRUE);
2988   g_free (signal_data);
2989 }
2990
2991 static gchar *
2992 args_to_rule (const gchar *sender,
2993               const gchar *interface_name,
2994               const gchar *member,
2995               const gchar *object_path,
2996               const gchar *arg0,
2997               gboolean     negate)
2998 {
2999   GString *rule;
3000
3001   rule = g_string_new ("type='signal'");
3002   if (negate)
3003     g_string_prepend_c (rule, '-');
3004   if (sender != NULL)
3005     g_string_append_printf (rule, ",sender='%s'", sender);
3006   if (interface_name != NULL)
3007     g_string_append_printf (rule, ",interface='%s'", interface_name);
3008   if (member != NULL)
3009     g_string_append_printf (rule, ",member='%s'", member);
3010   if (object_path != NULL)
3011     g_string_append_printf (rule, ",path='%s'", object_path);
3012   if (arg0 != NULL)
3013     g_string_append_printf (rule, ",arg0='%s'", arg0);
3014
3015   return g_string_free (rule, FALSE);
3016 }
3017
3018 static guint _global_subscriber_id = 1;
3019 static guint _global_registration_id = 1;
3020 static guint _global_subtree_registration_id = 1;
3021
3022 /* ---------------------------------------------------------------------------------------------------- */
3023
3024 /* must hold lock when calling */
3025 static void
3026 add_match_rule (GDBusConnection *connection,
3027                 const gchar     *match_rule)
3028 {
3029   GError *error;
3030   GDBusMessage *message;
3031
3032   if (match_rule[0] == '-')
3033     return;
3034
3035   message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
3036                                             "/org/freedesktop/DBus", /* path */
3037                                             "org.freedesktop.DBus", /* interface */
3038                                             "AddMatch");
3039   g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
3040   error = NULL;
3041   if (!g_dbus_connection_send_message_unlocked (connection,
3042                                                 message,
3043                                                 G_DBUS_SEND_MESSAGE_FLAGS_NONE,
3044                                                 NULL,
3045                                                 &error))
3046     {
3047       g_critical ("Error while sending AddMatch() message: %s", error->message);
3048       g_error_free (error);
3049     }
3050   g_object_unref (message);
3051 }
3052
3053 /* ---------------------------------------------------------------------------------------------------- */
3054
3055 /* must hold lock when calling */
3056 static void
3057 remove_match_rule (GDBusConnection *connection,
3058                    const gchar     *match_rule)
3059 {
3060   GError *error;
3061   GDBusMessage *message;
3062
3063   if (match_rule[0] == '-')
3064     return;
3065
3066   message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
3067                                             "/org/freedesktop/DBus", /* path */
3068                                             "org.freedesktop.DBus", /* interface */
3069                                             "RemoveMatch");
3070   g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));
3071
3072   error = NULL;
3073   if (!g_dbus_connection_send_message_unlocked (connection,
3074                                                 message,
3075                                                 G_DBUS_SEND_MESSAGE_FLAGS_NONE,
3076                                                 NULL,
3077                                                 &error))
3078     {
3079       g_critical ("Error while sending RemoveMatch() message: %s", error->message);
3080       g_error_free (error);
3081     }
3082   g_object_unref (message);
3083 }
3084
3085 /* ---------------------------------------------------------------------------------------------------- */
3086
3087 static gboolean
3088 is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
3089 {
3090   return g_strcmp0 (signal_data->sender_unique_name, "org.freedesktop.DBus") == 0 &&
3091          g_strcmp0 (signal_data->interface_name, "org.freedesktop.DBus") == 0 &&
3092          g_strcmp0 (signal_data->object_path, "/org/freedesktop/DBus") == 0 &&
3093          (g_strcmp0 (signal_data->member, "NameLost") == 0 ||
3094           g_strcmp0 (signal_data->member, "NameAcquired") == 0);
3095 }
3096
3097 /* ---------------------------------------------------------------------------------------------------- */
3098
3099 /**
3100  * g_dbus_connection_signal_subscribe:
3101  * @connection: A #GDBusConnection.
3102  * @sender: (allow-none): Sender name to match on (unique or well-known name)
3103  *                        or %NULL to listen from all senders.
3104  * @interface_name: (allow-none): D-Bus interface name to match on or %NULL to
3105  *                                match on all interfaces.
3106  * @member: (allow-none): D-Bus signal name to match on or %NULL to match on all signals.
3107  * @object_path: (allow-none): Object path to match on or %NULL to match on all object paths.
3108  * @arg0: (allow-none): Contents of first string argument to match on or %NULL
3109  *                      to match on all kinds of arguments.
3110  * @flags: Flags describing how to subscribe to the signal (currently unused).
3111  * @callback: Callback to invoke when there is a signal matching the requested data.
3112  * @user_data: User data to pass to @callback.
3113  * @user_data_free_func: Function to free @user_data with when subscription is removed or %NULL.
3114  *
3115  * Subscribes to signals on @connection and invokes @callback with a
3116  * whenever the signal is received. Note that @callback
3117  * will be invoked in the <link
3118  * linkend="g-main-context-push-thread-default">thread-default main
3119  * loop</link> of the thread you are calling this method from.
3120  *
3121  * If @connection is not a message bus connection, @sender must be
3122  * %NULL.
3123  *
3124  * If @sender is a well-known name note that @callback is invoked with
3125  * the unique name for the owner of @sender, not the well-known name
3126  * as one would expect. This is because the message bus rewrites the
3127  * name. As such, to avoid certain race conditions, users should be
3128  * tracking the name owner of the well-known name and use that when
3129  * processing the received signal.
3130  *
3131  * Returns: A subscription identifier that can be used with g_dbus_connection_signal_unsubscribe().
3132  *
3133  * Since: 2.26
3134  */
3135 guint
3136 g_dbus_connection_signal_subscribe (GDBusConnection     *connection,
3137                                     const gchar         *sender,
3138                                     const gchar         *interface_name,
3139                                     const gchar         *member,
3140                                     const gchar         *object_path,
3141                                     const gchar         *arg0,
3142                                     GDBusSignalFlags     flags,
3143                                     GDBusSignalCallback  callback,
3144                                     gpointer             user_data,
3145                                     GDestroyNotify       user_data_free_func)
3146 {
3147   gchar *rule;
3148   SignalData *signal_data;
3149   SignalSubscriber subscriber;
3150   GPtrArray *signal_data_array;
3151   const gchar *sender_unique_name;
3152
3153   /* Right now we abort if AddMatch() fails since it can only fail with the bus being in
3154    * an OOM condition. We might want to change that but that would involve making
3155    * g_dbus_connection_signal_subscribe() asynchronous and having the call sites
3156    * handle that. And there's really no sensible way of handling this short of retrying
3157    * to add the match rule... and then there's the little thing that, hey, maybe there's
3158    * a reason the bus in an OOM condition.
3159    *
3160    * Doable, but not really sure it's worth it...
3161    */
3162
3163   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
3164   g_return_val_if_fail (sender == NULL || (g_dbus_is_name (sender) && (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)), 0);
3165   g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), 0);
3166   g_return_val_if_fail (member == NULL || g_dbus_is_member_name (member), 0);
3167   g_return_val_if_fail (object_path == NULL || g_variant_is_object_path (object_path), 0);
3168   g_return_val_if_fail (callback != NULL, 0);
3169
3170   CONNECTION_LOCK (connection);
3171
3172   /* If G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE was specified, we will end up
3173    * with a '-' character to prefix the rule (which will otherwise be
3174    * normal).
3175    *
3176    * This allows us to hash the rule and do our lifecycle tracking in
3177    * the usual way, but the '-' prevents the match rule from ever
3178    * actually being send to the bus (either for add or remove).
3179    */
3180   rule = args_to_rule (sender, interface_name, member, object_path, arg0,
3181                        (flags & G_DBUS_SIGNAL_FLAGS_NO_MATCH_RULE) != 0);
3182
3183   if (sender != NULL && (g_dbus_is_unique_name (sender) || g_strcmp0 (sender, "org.freedesktop.DBus") == 0))
3184     sender_unique_name = sender;
3185   else
3186     sender_unique_name = "";
3187
3188   subscriber.callback = callback;
3189   subscriber.user_data = user_data;
3190   subscriber.user_data_free_func = user_data_free_func;
3191   subscriber.id = _global_subscriber_id++; /* TODO: overflow etc. */
3192   subscriber.context = g_main_context_get_thread_default ();
3193   if (subscriber.context != NULL)
3194     g_main_context_ref (subscriber.context);
3195
3196   /* see if we've already have this rule */
3197   signal_data = g_hash_table_lookup (connection->map_rule_to_signal_data, rule);
3198   if (signal_data != NULL)
3199     {
3200       g_array_append_val (signal_data->subscribers, subscriber);
3201       g_free (rule);
3202       goto out;
3203     }
3204
3205   signal_data = g_new0 (SignalData, 1);
3206   signal_data->rule                  = rule;
3207   signal_data->sender                = g_strdup (sender);
3208   signal_data->sender_unique_name    = g_strdup (sender_unique_name);
3209   signal_data->interface_name        = g_strdup (interface_name);
3210   signal_data->member                = g_strdup (member);
3211   signal_data->object_path           = g_strdup (object_path);
3212   signal_data->arg0                  = g_strdup (arg0);
3213   signal_data->subscribers           = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
3214   g_array_append_val (signal_data->subscribers, subscriber);
3215
3216   g_hash_table_insert (connection->map_rule_to_signal_data,
3217                        signal_data->rule,
3218                        signal_data);
3219
3220   /* Add the match rule to the bus...
3221    *
3222    * Avoid adding match rules for NameLost and NameAcquired messages - the bus will
3223    * always send such messages to us.
3224    */
3225   if (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
3226     {
3227       if (!is_signal_data_for_name_lost_or_acquired (signal_data))
3228         add_match_rule (connection, signal_data->rule);
3229     }
3230
3231   signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
3232                                            signal_data->sender_unique_name);
3233   if (signal_data_array == NULL)
3234     {
3235       signal_data_array = g_ptr_array_new ();
3236       g_hash_table_insert (connection->map_sender_unique_name_to_signal_data_array,
3237                            g_strdup (signal_data->sender_unique_name),
3238                            signal_data_array);
3239     }
3240   g_ptr_array_add (signal_data_array, signal_data);
3241
3242  out:
3243   g_hash_table_insert (connection->map_id_to_signal_data,
3244                        GUINT_TO_POINTER (subscriber.id),
3245                        signal_data);
3246
3247   CONNECTION_UNLOCK (connection);
3248
3249   return subscriber.id;
3250 }
3251
3252 /* ---------------------------------------------------------------------------------------------------- */
3253
3254 /* must hold lock when calling this (except if connection->finalizing is TRUE) */
3255 static void
3256 unsubscribe_id_internal (GDBusConnection *connection,
3257                          guint            subscription_id,
3258                          GArray          *out_removed_subscribers)
3259 {
3260   SignalData *signal_data;
3261   GPtrArray *signal_data_array;
3262   guint n;
3263
3264   signal_data = g_hash_table_lookup (connection->map_id_to_signal_data,
3265                                      GUINT_TO_POINTER (subscription_id));
3266   if (signal_data == NULL)
3267     {
3268       /* Don't warn here, we may have thrown all subscriptions out when the connection was closed */
3269       goto out;
3270     }
3271
3272   for (n = 0; n < signal_data->subscribers->len; n++)
3273     {
3274       SignalSubscriber *subscriber;
3275
3276       subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, n));
3277       if (subscriber->id != subscription_id)
3278         continue;
3279
3280       g_warn_if_fail (g_hash_table_remove (connection->map_id_to_signal_data,
3281                                            GUINT_TO_POINTER (subscription_id)));
3282       g_array_append_val (out_removed_subscribers, *subscriber);
3283       g_array_remove_index (signal_data->subscribers, n);
3284
3285       if (signal_data->subscribers->len == 0)
3286         {
3287           g_warn_if_fail (g_hash_table_remove (connection->map_rule_to_signal_data, signal_data->rule));
3288
3289           signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array,
3290                                                    signal_data->sender_unique_name);
3291           g_warn_if_fail (signal_data_array != NULL);
3292           g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));
3293
3294           if (signal_data_array->len == 0)
3295             {
3296               g_warn_if_fail (g_hash_table_remove (connection->map_sender_unique_name_to_signal_data_array,
3297                                                    signal_data->sender_unique_name));
3298             }
3299
3300           /* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
3301           if (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
3302             {
3303               if (!is_signal_data_for_name_lost_or_acquired (signal_data))
3304                 if (!connection->closed && !connection->finalizing)
3305                   remove_match_rule (connection, signal_data->rule);
3306             }
3307           signal_data_free (signal_data);
3308         }
3309
3310       goto out;
3311     }
3312
3313   g_assert_not_reached ();
3314
3315  out:
3316   ;
3317 }
3318
3319 /**
3320  * g_dbus_connection_signal_unsubscribe:
3321  * @connection: A #GDBusConnection.
3322  * @subscription_id: A subscription id obtained from g_dbus_connection_signal_subscribe().
3323  *
3324  * Unsubscribes from signals.
3325  *
3326  * Since: 2.26
3327  */
3328 void
3329 g_dbus_connection_signal_unsubscribe (GDBusConnection *connection,
3330                                       guint            subscription_id)
3331 {
3332   GArray *subscribers;
3333   guint n;
3334
3335   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
3336
3337   subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
3338
3339   CONNECTION_LOCK (connection);
3340   unsubscribe_id_internal (connection,
3341                            subscription_id,
3342                            subscribers);
3343   CONNECTION_UNLOCK (connection);
3344
3345   /* invariant */
3346   g_assert (subscribers->len == 0 || subscribers->len == 1);
3347
3348   /* call GDestroyNotify without lock held */
3349   for (n = 0; n < subscribers->len; n++)
3350     {
3351       SignalSubscriber *subscriber;
3352       subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
3353       call_destroy_notify (subscriber->context,
3354                            subscriber->user_data_free_func,
3355                            subscriber->user_data);
3356       if (subscriber->context != NULL)
3357         g_main_context_unref (subscriber->context);
3358     }
3359
3360   g_array_free (subscribers, TRUE);
3361 }
3362
3363 /* ---------------------------------------------------------------------------------------------------- */
3364
3365 typedef struct
3366 {
3367   guint                subscription_id;
3368   GDBusSignalCallback  callback;
3369   gpointer             user_data;
3370   GDBusMessage        *message;
3371   GDBusConnection     *connection;
3372   const gchar         *sender;
3373   const gchar         *path;
3374   const gchar         *interface;
3375   const gchar         *member;
3376 } SignalInstance;
3377
3378 /* called on delivery thread (e.g. where g_dbus_connection_signal_subscribe() was called) with
3379  * no locks held
3380  */
3381 static gboolean
3382 emit_signal_instance_in_idle_cb (gpointer data)
3383 {
3384   SignalInstance *signal_instance = data;
3385   GVariant *parameters;
3386   gboolean has_subscription;
3387
3388   parameters = g_dbus_message_get_body (signal_instance->message);
3389   if (parameters == NULL)
3390     {
3391       parameters = g_variant_new ("()");
3392       g_variant_ref_sink (parameters);
3393     }
3394   else
3395     {
3396       g_variant_ref_sink (parameters);
3397     }
3398
3399 #if 0
3400   g_print ("in emit_signal_instance_in_idle_cb (id=%d sender=%s path=%s interface=%s member=%s params=%s)\n",
3401            signal_instance->subscription_id,
3402            signal_instance->sender,
3403            signal_instance->path,
3404            signal_instance->interface,
3405            signal_instance->member,
3406            g_variant_print (parameters, TRUE));
3407 #endif
3408
3409   /* Careful here, don't do the callback if we no longer has the subscription */
3410   CONNECTION_LOCK (signal_instance->connection);
3411   has_subscription = FALSE;
3412   if (g_hash_table_lookup (signal_instance->connection->map_id_to_signal_data,
3413                            GUINT_TO_POINTER (signal_instance->subscription_id)) != NULL)
3414     has_subscription = TRUE;
3415   CONNECTION_UNLOCK (signal_instance->connection);
3416
3417   if (has_subscription)
3418     signal_instance->callback (signal_instance->connection,
3419                                signal_instance->sender,
3420                                signal_instance->path,
3421                                signal_instance->interface,
3422                                signal_instance->member,
3423                                parameters,
3424                                signal_instance->user_data);
3425
3426   g_variant_unref (parameters);
3427
3428   return FALSE;
3429 }
3430
3431 static void
3432 signal_instance_free (SignalInstance *signal_instance)
3433 {
3434   g_object_unref (signal_instance->message);
3435   g_object_unref (signal_instance->connection);
3436   g_free (signal_instance);
3437 }
3438
3439 /* called in message handler thread WITH lock held */
3440 static void
3441 schedule_callbacks (GDBusConnection *connection,
3442                     GPtrArray       *signal_data_array,
3443                     GDBusMessage    *message,
3444                     const gchar     *sender)
3445 {
3446   guint n, m;
3447   const gchar *interface;
3448   const gchar *member;
3449   const gchar *path;
3450   const gchar *arg0;
3451
3452   interface = NULL;
3453   member = NULL;
3454   path = NULL;
3455   arg0 = NULL;
3456
3457   interface = g_dbus_message_get_interface (message);
3458   member = g_dbus_message_get_member (message);
3459   path = g_dbus_message_get_path (message);
3460   arg0 = g_dbus_message_get_arg0 (message);
3461
3462 #if 0
3463   g_print ("In schedule_callbacks:\n"
3464            "  sender    = `%s'\n"
3465            "  interface = `%s'\n"
3466            "  member    = `%s'\n"
3467            "  path      = `%s'\n"
3468            "  arg0      = `%s'\n",
3469            sender,
3470            interface,
3471            member,
3472            path,
3473            arg0);
3474 #endif
3475
3476   /* TODO: if this is slow, then we can change signal_data_array into
3477    *       map_object_path_to_signal_data_array or something.
3478    */
3479   for (n = 0; n < signal_data_array->len; n++)
3480     {
3481       SignalData *signal_data = signal_data_array->pdata[n];
3482
3483       if (signal_data->interface_name != NULL && g_strcmp0 (signal_data->interface_name, interface) != 0)
3484         continue;
3485
3486       if (signal_data->member != NULL && g_strcmp0 (signal_data->member, member) != 0)
3487         continue;
3488
3489       if (signal_data->object_path != NULL && g_strcmp0 (signal_data->object_path, path) != 0)
3490         continue;
3491
3492       if (signal_data->arg0 != NULL && g_strcmp0 (signal_data->arg0, arg0) != 0)
3493         continue;
3494
3495       for (m = 0; m < signal_data->subscribers->len; m++)
3496         {
3497           SignalSubscriber *subscriber;
3498           GSource *idle_source;
3499           SignalInstance *signal_instance;
3500
3501           subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, m));
3502
3503           signal_instance = g_new0 (SignalInstance, 1);
3504           signal_instance->subscription_id = subscriber->id;
3505           signal_instance->callback = subscriber->callback;
3506           signal_instance->user_data = subscriber->user_data;
3507           signal_instance->message = g_object_ref (message);
3508           signal_instance->connection = g_object_ref (connection);
3509           signal_instance->sender = sender;
3510           signal_instance->path = path;
3511           signal_instance->interface = interface;
3512           signal_instance->member = member;
3513
3514           idle_source = g_idle_source_new ();
3515           g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
3516           g_source_set_callback (idle_source,
3517                                  emit_signal_instance_in_idle_cb,
3518                                  signal_instance,
3519                                  (GDestroyNotify) signal_instance_free);
3520           g_source_attach (idle_source, subscriber->context);
3521           g_source_unref (idle_source);
3522         }
3523     }
3524 }
3525
3526 /* called in message handler thread with lock held */
3527 static void
3528 distribute_signals (GDBusConnection *connection,
3529                     GDBusMessage    *message)
3530 {
3531   GPtrArray *signal_data_array;
3532   const gchar *sender;
3533
3534   sender = g_dbus_message_get_sender (message);
3535
3536   if (G_UNLIKELY (_g_dbus_debug_signal ()))
3537     {
3538       _g_dbus_debug_print_lock ();
3539       g_print ("========================================================================\n"
3540                "GDBus-debug:Signal:\n"
3541                " <<<< RECEIVED SIGNAL %s.%s\n"
3542                "      on object %s\n"
3543                "      sent by name %s\n",
3544                g_dbus_message_get_interface (message),
3545                g_dbus_message_get_member (message),
3546                g_dbus_message_get_path (message),
3547                sender != NULL ? sender : "(none)");
3548       _g_dbus_debug_print_unlock ();
3549     }
3550
3551   /* collect subscribers that match on sender */
3552   if (sender != NULL)
3553     {
3554       signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array, sender);
3555       if (signal_data_array != NULL)
3556         schedule_callbacks (connection, signal_data_array, message, sender);
3557     }
3558
3559   /* collect subscribers not matching on sender */
3560   signal_data_array = g_hash_table_lookup (connection->map_sender_unique_name_to_signal_data_array, "");
3561   if (signal_data_array != NULL)
3562     schedule_callbacks (connection, signal_data_array, message, sender);
3563 }
3564
3565 /* ---------------------------------------------------------------------------------------------------- */
3566
3567 /* only called from finalize(), removes all subscriptions */
3568 static void
3569 purge_all_signal_subscriptions (GDBusConnection *connection)
3570 {
3571   GHashTableIter iter;
3572   gpointer key;
3573   GArray *ids;
3574   GArray *subscribers;
3575   guint n;
3576
3577   ids = g_array_new (FALSE, FALSE, sizeof (guint));
3578   g_hash_table_iter_init (&iter, connection->map_id_to_signal_data);
3579   while (g_hash_table_iter_next (&iter, &key, NULL))
3580     {
3581       guint subscription_id = GPOINTER_TO_UINT (key);
3582       g_array_append_val (ids, subscription_id);
3583     }
3584
3585   subscribers = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
3586   for (n = 0; n < ids->len; n++)
3587     {
3588       guint subscription_id = g_array_index (ids, guint, n);
3589       unsubscribe_id_internal (connection,
3590                                subscription_id,
3591                                subscribers);
3592     }
3593   g_array_free (ids, TRUE);
3594
3595   /* call GDestroyNotify without lock held */
3596   for (n = 0; n < subscribers->len; n++)
3597     {
3598       SignalSubscriber *subscriber;
3599       subscriber = &(g_array_index (subscribers, SignalSubscriber, n));
3600       call_destroy_notify (subscriber->context,
3601                            subscriber->user_data_free_func,
3602                            subscriber->user_data);
3603       if (subscriber->context != NULL)
3604         g_main_context_unref (subscriber->context);
3605     }
3606
3607   g_array_free (subscribers, TRUE);
3608 }
3609
3610 /* ---------------------------------------------------------------------------------------------------- */
3611
3612 static GDBusInterfaceVTable *
3613 _g_dbus_interface_vtable_copy (const GDBusInterfaceVTable *vtable)
3614 {
3615   /* Don't waste memory by copying padding - remember to update this
3616    * when changing struct _GDBusInterfaceVTable in gdbusconnection.h
3617    */
3618   return g_memdup ((gconstpointer) vtable, 3 * sizeof (gpointer));
3619 }
3620
3621 static void
3622 _g_dbus_interface_vtable_free (GDBusInterfaceVTable *vtable)
3623 {
3624   g_free (vtable);
3625 }
3626
3627 /* ---------------------------------------------------------------------------------------------------- */
3628
3629 static GDBusSubtreeVTable *
3630 _g_dbus_subtree_vtable_copy (const GDBusSubtreeVTable *vtable)
3631 {
3632   /* Don't waste memory by copying padding - remember to update this
3633    * when changing struct _GDBusSubtreeVTable in gdbusconnection.h
3634    */
3635   return g_memdup ((gconstpointer) vtable, 3 * sizeof (gpointer));
3636 }
3637
3638 static void
3639 _g_dbus_subtree_vtable_free (GDBusSubtreeVTable *vtable)
3640 {
3641   g_free (vtable);
3642 }
3643
3644 /* ---------------------------------------------------------------------------------------------------- */
3645
3646 struct ExportedObject
3647 {
3648   gchar *object_path;
3649   GDBusConnection *connection;
3650
3651   /* maps gchar* -> ExportedInterface* */
3652   GHashTable *map_if_name_to_ei;
3653 };
3654
3655 /* only called with lock held */
3656 static void
3657 exported_object_free (ExportedObject *eo)
3658 {
3659   g_free (eo->object_path);
3660   g_hash_table_unref (eo->map_if_name_to_ei);
3661   g_free (eo);
3662 }
3663
3664 typedef struct
3665 {
3666   ExportedObject *eo;
3667
3668   guint                       id;
3669   gchar                      *interface_name;
3670   GDBusInterfaceVTable       *vtable;
3671   GDBusInterfaceInfo         *interface_info;
3672
3673   GMainContext               *context;
3674   gpointer                    user_data;
3675   GDestroyNotify              user_data_free_func;
3676 } ExportedInterface;
3677
3678 /* called with lock held */
3679 static void
3680 exported_interface_free (ExportedInterface *ei)
3681 {
3682   g_dbus_interface_info_cache_release (ei->interface_info);
3683   g_dbus_interface_info_unref ((GDBusInterfaceInfo *) ei->interface_info);
3684
3685   call_destroy_notify (ei->context,
3686                        ei->user_data_free_func,
3687                        ei->user_data);
3688
3689   if (ei->context != NULL)
3690     g_main_context_unref (ei->context);
3691
3692   g_free (ei->interface_name);
3693   _g_dbus_interface_vtable_free (ei->vtable);
3694   g_free (ei);
3695 }
3696
3697 /* ---------------------------------------------------------------------------------------------------- */
3698
3699 /* Convenience function to check if @registration_id (if not zero) or
3700  * @subtree_registration_id (if not zero) has been unregistered. If
3701  * so, returns %TRUE.
3702  *
3703  * Caller must *not* hold lock.
3704  */
3705 static gboolean
3706 has_object_been_unregistered (GDBusConnection  *connection,
3707                               guint             registration_id,
3708                               guint             subtree_registration_id)
3709 {
3710   gboolean ret;
3711
3712   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
3713
3714   ret = FALSE;
3715
3716   CONNECTION_LOCK (connection);
3717   if (registration_id != 0 && g_hash_table_lookup (connection->map_id_to_ei,
3718                                                    GUINT_TO_POINTER (registration_id)) == NULL)
3719     {
3720       ret = TRUE;
3721     }
3722   else if (subtree_registration_id != 0 && g_hash_table_lookup (connection->map_id_to_es,
3723                                                                 GUINT_TO_POINTER (subtree_registration_id)) == NULL)
3724     {
3725       ret = TRUE;
3726     }
3727   CONNECTION_UNLOCK (connection);
3728
3729   return ret;
3730 }
3731
3732 /* ---------------------------------------------------------------------------------------------------- */
3733
3734 typedef struct
3735 {
3736   GDBusConnection *connection;
3737   GDBusMessage *message;
3738   gpointer user_data;
3739   const gchar *property_name;
3740   const GDBusInterfaceVTable *vtable;
3741   GDBusInterfaceInfo *interface_info;
3742   const GDBusPropertyInfo *property_info;
3743   guint registration_id;
3744   guint subtree_registration_id;
3745 } PropertyData;
3746
3747 static void
3748 property_data_free (PropertyData *data)
3749 {
3750   g_object_unref (data->connection);
3751   g_object_unref (data->message);
3752   g_free (data);
3753 }
3754
3755 /* called in thread where object was registered - no locks held */
3756 static gboolean
3757 invoke_get_property_in_idle_cb (gpointer _data)
3758 {
3759   PropertyData *data = _data;
3760   GVariant *value;
3761   GError *error;
3762   GDBusMessage *reply;
3763
3764   if (has_object_been_unregistered (data->connection,
3765                                     data->registration_id,
3766                                     data->subtree_registration_id))
3767     {
3768       reply = g_dbus_message_new_method_error (data->message,
3769                                                "org.freedesktop.DBus.Error.UnknownMethod",
3770                                                _("No such interface `org.freedesktop.DBus.Properties' on object at path %s"),
3771                                                g_dbus_message_get_path (data->message));
3772       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3773       g_object_unref (reply);
3774       goto out;
3775     }
3776
3777   error = NULL;
3778   value = data->vtable->get_property (data->connection,
3779                                       g_dbus_message_get_sender (data->message),
3780                                       g_dbus_message_get_path (data->message),
3781                                       data->interface_info->name,
3782                                       data->property_name,
3783                                       &error,
3784                                       data->user_data);
3785
3786
3787   if (value != NULL)
3788     {
3789       g_assert_no_error (error);
3790
3791       if (g_variant_is_floating (value))
3792         g_variant_ref_sink (value);
3793       reply = g_dbus_message_new_method_reply (data->message);
3794       g_dbus_message_set_body (reply, g_variant_new ("(v)", value));
3795       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3796       g_variant_unref (value);
3797       g_object_unref (reply);
3798     }
3799   else
3800     {
3801       gchar *dbus_error_name;
3802       g_assert (error != NULL);
3803       dbus_error_name = g_dbus_error_encode_gerror (error);
3804       reply = g_dbus_message_new_method_error_literal (data->message,
3805                                                        dbus_error_name,
3806                                                        error->message);
3807       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3808       g_free (dbus_error_name);
3809       g_error_free (error);
3810       g_object_unref (reply);
3811     }
3812
3813  out:
3814   return FALSE;
3815 }
3816
3817 /* called in thread where object was registered - no locks held */
3818 static gboolean
3819 invoke_set_property_in_idle_cb (gpointer _data)
3820 {
3821   PropertyData *data = _data;
3822   GError *error;
3823   GDBusMessage *reply;
3824   GVariant *value;
3825
3826   error = NULL;
3827   value = NULL;
3828
3829   g_variant_get (g_dbus_message_get_body (data->message),
3830                  "(ssv)",
3831                  NULL,
3832                  NULL,
3833                  &value);
3834
3835   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if the type
3836    * of the given value is wrong
3837    */
3838   if (g_strcmp0 (g_variant_get_type_string (value), data->property_info->signature) != 0)
3839     {
3840       reply = g_dbus_message_new_method_error (data->message,
3841                                                "org.freedesktop.DBus.Error.InvalidArgs",
3842                                                _("Error setting property `%s': Expected type `%s' but got `%s'"),
3843                                                data->property_info->name,
3844                                                data->property_info->signature,
3845                                                g_variant_get_type_string (value));
3846       goto out;
3847     }
3848
3849   if (!data->vtable->set_property (data->connection,
3850                                    g_dbus_message_get_sender (data->message),
3851                                    g_dbus_message_get_path (data->message),
3852                                    data->interface_info->name,
3853                                    data->property_name,
3854                                    value,
3855                                    &error,
3856                                    data->user_data))
3857     {
3858       gchar *dbus_error_name;
3859       g_assert (error != NULL);
3860       dbus_error_name = g_dbus_error_encode_gerror (error);
3861       reply = g_dbus_message_new_method_error_literal (data->message,
3862                                                        dbus_error_name,
3863                                                        error->message);
3864       g_free (dbus_error_name);
3865       g_error_free (error);
3866     }
3867   else
3868     {
3869       reply = g_dbus_message_new_method_reply (data->message);
3870     }
3871
3872  out:
3873   g_assert (reply != NULL);
3874   g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3875   g_object_unref (reply);
3876   g_variant_unref (value);
3877
3878   return FALSE;
3879 }
3880
3881 /* called with lock held */
3882 static gboolean
3883 validate_and_maybe_schedule_property_getset (GDBusConnection            *connection,
3884                                              GDBusMessage               *message,
3885                                              guint                       registration_id,
3886                                              guint                       subtree_registration_id,
3887                                              gboolean                    is_get,
3888                                              GDBusInterfaceInfo         *interface_info,
3889                                              const GDBusInterfaceVTable *vtable,
3890                                              GMainContext               *main_context,
3891                                              gpointer                    user_data)
3892 {
3893   gboolean handled;
3894   const char *interface_name;
3895   const char *property_name;
3896   const GDBusPropertyInfo *property_info;
3897   GSource *idle_source;
3898   PropertyData *property_data;
3899   GDBusMessage *reply;
3900
3901   handled = FALSE;
3902
3903   if (is_get)
3904     g_variant_get (g_dbus_message_get_body (message),
3905                    "(&s&s)",
3906                    &interface_name,
3907                    &property_name);
3908   else
3909     g_variant_get (g_dbus_message_get_body (message),
3910                    "(&s&sv)",
3911                    &interface_name,
3912                    &property_name,
3913                    NULL);
3914
3915
3916   if (is_get)
3917     {
3918       if (vtable == NULL || vtable->get_property == NULL)
3919         goto out;
3920     }
3921   else
3922     {
3923       if (vtable == NULL || vtable->set_property == NULL)
3924         goto out;
3925     }
3926
3927   /* Check that the property exists - if not fail with org.freedesktop.DBus.Error.InvalidArgs
3928    */
3929   property_info = NULL;
3930
3931   /* TODO: the cost of this is O(n) - it might be worth caching the result */
3932   property_info = g_dbus_interface_info_lookup_property (interface_info, property_name);
3933   if (property_info == NULL)
3934     {
3935       reply = g_dbus_message_new_method_error (message,
3936                                                "org.freedesktop.DBus.Error.InvalidArgs",
3937                                                _("No such property `%s'"),
3938                                                property_name);
3939       g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3940       g_object_unref (reply);
3941       handled = TRUE;
3942       goto out;
3943     }
3944
3945   if (is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
3946     {
3947       reply = g_dbus_message_new_method_error (message,
3948                                                "org.freedesktop.DBus.Error.InvalidArgs",
3949                                                _("Property `%s' is not readable"),
3950                                                property_name);
3951       g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3952       g_object_unref (reply);
3953       handled = TRUE;
3954       goto out;
3955     }
3956   else if (!is_get && !(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_WRITABLE))
3957     {
3958       reply = g_dbus_message_new_method_error (message,
3959                                                "org.freedesktop.DBus.Error.InvalidArgs",
3960                                                _("Property `%s' is not writable"),
3961                                                property_name);
3962       g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
3963       g_object_unref (reply);
3964       handled = TRUE;
3965       goto out;
3966     }
3967
3968   /* ok, got the property info - call user code in an idle handler */
3969   property_data = g_new0 (PropertyData, 1);
3970   property_data->connection = g_object_ref (connection);
3971   property_data->message = g_object_ref (message);
3972   property_data->user_data = user_data;
3973   property_data->property_name = property_name;
3974   property_data->vtable = vtable;
3975   property_data->interface_info = interface_info;
3976   property_data->property_info = property_info;
3977   property_data->registration_id = registration_id;
3978   property_data->subtree_registration_id = subtree_registration_id;
3979
3980   idle_source = g_idle_source_new ();
3981   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
3982   g_source_set_callback (idle_source,
3983                          is_get ? invoke_get_property_in_idle_cb : invoke_set_property_in_idle_cb,
3984                          property_data,
3985                          (GDestroyNotify) property_data_free);
3986   g_source_attach (idle_source, main_context);
3987   g_source_unref (idle_source);
3988
3989   handled = TRUE;
3990
3991  out:
3992   return handled;
3993 }
3994
3995 /* called with lock held */
3996 static gboolean
3997 handle_getset_property (GDBusConnection *connection,
3998                         ExportedObject  *eo,
3999                         GDBusMessage    *message,
4000                         gboolean         is_get)
4001 {
4002   ExportedInterface *ei;
4003   gboolean handled;
4004   const char *interface_name;
4005   const char *property_name;
4006
4007   handled = FALSE;
4008
4009   if (is_get)
4010     g_variant_get (g_dbus_message_get_body (message),
4011                    "(&s&s)",
4012                    &interface_name,
4013                    &property_name);
4014   else
4015     g_variant_get (g_dbus_message_get_body (message),
4016                    "(&s&sv)",
4017                    &interface_name,
4018                    &property_name,
4019                    NULL);
4020
4021   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
4022    * no such interface registered
4023    */
4024   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
4025   if (ei == NULL)
4026     {
4027       GDBusMessage *reply;
4028       reply = g_dbus_message_new_method_error (message,
4029                                                "org.freedesktop.DBus.Error.InvalidArgs",
4030                                                _("No such interface `%s'"),
4031                                                interface_name);
4032       g_dbus_connection_send_message_unlocked (eo->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4033       g_object_unref (reply);
4034       handled = TRUE;
4035       goto out;
4036     }
4037
4038   handled = validate_and_maybe_schedule_property_getset (eo->connection,
4039                                                          message,
4040                                                          ei->id,
4041                                                          0,
4042                                                          is_get,
4043                                                          ei->interface_info,
4044                                                          ei->vtable,
4045                                                          ei->context,
4046                                                          ei->user_data);
4047  out:
4048   return handled;
4049 }
4050
4051 /* ---------------------------------------------------------------------------------------------------- */
4052
4053 typedef struct
4054 {
4055   GDBusConnection *connection;
4056   GDBusMessage *message;
4057   gpointer user_data;
4058   const GDBusInterfaceVTable *vtable;
4059   GDBusInterfaceInfo *interface_info;
4060   guint registration_id;
4061   guint subtree_registration_id;
4062 } PropertyGetAllData;
4063
4064 static void
4065 property_get_all_data_free (PropertyData *data)
4066 {
4067   g_object_unref (data->connection);
4068   g_object_unref (data->message);
4069   g_free (data);
4070 }
4071
4072 /* called in thread where object was registered - no locks held */
4073 static gboolean
4074 invoke_get_all_properties_in_idle_cb (gpointer _data)
4075 {
4076   PropertyGetAllData *data = _data;
4077   GVariantBuilder builder;
4078   GDBusMessage *reply;
4079   guint n;
4080
4081   if (has_object_been_unregistered (data->connection,
4082                                     data->registration_id,
4083                                     data->subtree_registration_id))
4084     {
4085       reply = g_dbus_message_new_method_error (data->message,
4086                                                "org.freedesktop.DBus.Error.UnknownMethod",
4087                                                _("No such interface `org.freedesktop.DBus.Properties' on object at path %s"),
4088                                                g_dbus_message_get_path (data->message));
4089       g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4090       g_object_unref (reply);
4091       goto out;
4092     }
4093
4094   /* TODO: Right now we never fail this call - we just omit values if
4095    *       a get_property() call is failing.
4096    *
4097    *       We could fail the whole call if just a single get_property() call
4098    *       returns an error. We need clarification in the D-Bus spec about this.
4099    */
4100   g_variant_builder_init (&builder, G_VARIANT_TYPE ("(a{sv})"));
4101   g_variant_builder_open (&builder, G_VARIANT_TYPE ("a{sv}"));
4102   for (n = 0; data->interface_info->properties != NULL && data->interface_info->properties[n] != NULL; n++)
4103     {
4104       const GDBusPropertyInfo *property_info = data->interface_info->properties[n];
4105       GVariant *value;
4106
4107       if (!(property_info->flags & G_DBUS_PROPERTY_INFO_FLAGS_READABLE))
4108         continue;
4109
4110       value = data->vtable->get_property (data->connection,
4111                                           g_dbus_message_get_sender (data->message),
4112                                           g_dbus_message_get_path (data->message),
4113                                           data->interface_info->name,
4114                                           property_info->name,
4115                                           NULL,
4116                                           data->user_data);
4117
4118       if (value == NULL)
4119         continue;
4120
4121       if (g_variant_is_floating (value))
4122         g_variant_ref_sink (value);
4123       g_variant_builder_add (&builder,
4124                              "{sv}",
4125                              property_info->name,
4126                              value);
4127       g_variant_unref (value);
4128     }
4129   g_variant_builder_close (&builder);
4130
4131   reply = g_dbus_message_new_method_reply (data->message);
4132   g_dbus_message_set_body (reply, g_variant_builder_end (&builder));
4133   g_dbus_connection_send_message (data->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4134   g_object_unref (reply);
4135
4136  out:
4137   return FALSE;
4138 }
4139
4140 /* called with lock held */
4141 static gboolean
4142 validate_and_maybe_schedule_property_get_all (GDBusConnection            *connection,
4143                                               GDBusMessage               *message,
4144                                               guint                       registration_id,
4145                                               guint                       subtree_registration_id,
4146                                               GDBusInterfaceInfo         *interface_info,
4147                                               const GDBusInterfaceVTable *vtable,
4148                                               GMainContext               *main_context,
4149                                               gpointer                    user_data)
4150 {
4151   gboolean handled;
4152   const char *interface_name;
4153   GSource *idle_source;
4154   PropertyGetAllData *property_get_all_data;
4155
4156   handled = FALSE;
4157
4158   g_variant_get (g_dbus_message_get_body (message),
4159                  "(&s)",
4160                  &interface_name);
4161
4162   if (vtable == NULL || vtable->get_property == NULL)
4163     goto out;
4164
4165   /* ok, got the property info - call user in an idle handler */
4166   property_get_all_data = g_new0 (PropertyGetAllData, 1);
4167   property_get_all_data->connection = g_object_ref (connection);
4168   property_get_all_data->message = g_object_ref (message);
4169   property_get_all_data->user_data = user_data;
4170   property_get_all_data->vtable = vtable;
4171   property_get_all_data->interface_info = interface_info;
4172   property_get_all_data->registration_id = registration_id;
4173   property_get_all_data->subtree_registration_id = subtree_registration_id;
4174
4175   idle_source = g_idle_source_new ();
4176   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
4177   g_source_set_callback (idle_source,
4178                          invoke_get_all_properties_in_idle_cb,
4179                          property_get_all_data,
4180                          (GDestroyNotify) property_get_all_data_free);
4181   g_source_attach (idle_source, main_context);
4182   g_source_unref (idle_source);
4183
4184   handled = TRUE;
4185
4186  out:
4187   return handled;
4188 }
4189
4190 /* called with lock held */
4191 static gboolean
4192 handle_get_all_properties (GDBusConnection *connection,
4193                            ExportedObject  *eo,
4194                            GDBusMessage    *message)
4195 {
4196   ExportedInterface *ei;
4197   gboolean handled;
4198   const char *interface_name;
4199
4200   handled = FALSE;
4201
4202   g_variant_get (g_dbus_message_get_body (message),
4203                  "(&s)",
4204                  &interface_name);
4205
4206   /* Fail with org.freedesktop.DBus.Error.InvalidArgs if there is
4207    * no such interface registered
4208    */
4209   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
4210   if (ei == NULL)
4211     {
4212       GDBusMessage *reply;
4213       reply = g_dbus_message_new_method_error (message,
4214                                                "org.freedesktop.DBus.Error.InvalidArgs",
4215                                                _("No such interface"),
4216                                                interface_name);
4217       g_dbus_connection_send_message_unlocked (eo->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4218       g_object_unref (reply);
4219       handled = TRUE;
4220       goto out;
4221     }
4222
4223   handled = validate_and_maybe_schedule_property_get_all (eo->connection,
4224                                                           message,
4225                                                           ei->id,
4226                                                           0,
4227                                                           ei->interface_info,
4228                                                           ei->vtable,
4229                                                           ei->context,
4230                                                           ei->user_data);
4231  out:
4232   return handled;
4233 }
4234
4235 /* ---------------------------------------------------------------------------------------------------- */
4236
4237 static const gchar introspect_header[] =
4238   "<!DOCTYPE node PUBLIC \"-//freedesktop//DTD D-BUS Object Introspection 1.0//EN\"\n"
4239   "                      \"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd\">\n"
4240   "<!-- GDBus " PACKAGE_VERSION " -->\n"
4241   "<node>\n";
4242
4243 static const gchar introspect_tail[] =
4244   "</node>\n";
4245
4246 static const gchar introspect_properties_interface[] =
4247   "  <interface name=\"org.freedesktop.DBus.Properties\">\n"
4248   "    <method name=\"Get\">\n"
4249   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
4250   "      <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
4251   "      <arg type=\"v\" name=\"value\" direction=\"out\"/>\n"
4252   "    </method>\n"
4253   "    <method name=\"GetAll\">\n"
4254   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
4255   "      <arg type=\"a{sv}\" name=\"properties\" direction=\"out\"/>\n"
4256   "    </method>\n"
4257   "    <method name=\"Set\">\n"
4258   "      <arg type=\"s\" name=\"interface_name\" direction=\"in\"/>\n"
4259   "      <arg type=\"s\" name=\"property_name\" direction=\"in\"/>\n"
4260   "      <arg type=\"v\" name=\"value\" direction=\"in\"/>\n"
4261   "    </method>\n"
4262   "    <signal name=\"PropertiesChanged\">\n"
4263   "      <arg type=\"s\" name=\"interface_name\"/>\n"
4264   "      <arg type=\"a{sv}\" name=\"changed_properties\"/>\n"
4265   "      <arg type=\"as\" name=\"invalidated_properties\"/>\n"
4266   "    </signal>\n"
4267   "  </interface>\n";
4268
4269 static const gchar introspect_introspectable_interface[] =
4270   "  <interface name=\"org.freedesktop.DBus.Introspectable\">\n"
4271   "    <method name=\"Introspect\">\n"
4272   "      <arg type=\"s\" name=\"xml_data\" direction=\"out\"/>\n"
4273   "    </method>\n"
4274   "  </interface>\n"
4275   "  <interface name=\"org.freedesktop.DBus.Peer\">\n"
4276   "    <method name=\"Ping\"/>\n"
4277   "    <method name=\"GetMachineId\">\n"
4278   "      <arg type=\"s\" name=\"machine_uuid\" direction=\"out\"/>\n"
4279   "    </method>\n"
4280   "  </interface>\n";
4281
4282 static void
4283 introspect_append_header (GString *s)
4284 {
4285   g_string_append (s, introspect_header);
4286 }
4287
4288 static void
4289 maybe_add_path (const gchar *path, gsize path_len, const gchar *object_path, GHashTable *set)
4290 {
4291   if (g_str_has_prefix (object_path, path) && strlen (object_path) > path_len && object_path[path_len-1] == '/')
4292     {
4293       const gchar *begin;
4294       const gchar *end;
4295       gchar *s;
4296
4297       begin = object_path + path_len;
4298       end = strchr (begin, '/');
4299       if (end != NULL)
4300         s = g_strndup (begin, end - begin);
4301       else
4302         s = g_strdup (begin);
4303
4304       if (g_hash_table_lookup (set, s) == NULL)
4305         g_hash_table_insert (set, s, GUINT_TO_POINTER (1));
4306       else
4307         g_free (s);
4308     }
4309 }
4310
4311 /* TODO: we want a nicer public interface for this */
4312 static gchar **
4313 g_dbus_connection_list_registered_unlocked (GDBusConnection *connection,
4314                                             const gchar     *path)
4315 {
4316   GPtrArray *p;
4317   gchar **ret;
4318   GHashTableIter hash_iter;
4319   const gchar *object_path;
4320   gsize path_len;
4321   GHashTable *set;
4322   GList *keys;
4323   GList *l;
4324
4325   CONNECTION_ENSURE_LOCK (connection);
4326
4327   path_len = strlen (path);
4328   if (path_len > 1)
4329     path_len++;
4330
4331   set = g_hash_table_new (g_str_hash, g_str_equal);
4332
4333   g_hash_table_iter_init (&hash_iter, connection->map_object_path_to_eo);
4334   while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
4335     maybe_add_path (path, path_len, object_path, set);
4336
4337   g_hash_table_iter_init (&hash_iter, connection->map_object_path_to_es);
4338   while (g_hash_table_iter_next (&hash_iter, (gpointer) &object_path, NULL))
4339     maybe_add_path (path, path_len, object_path, set);
4340
4341   p = g_ptr_array_new ();
4342   keys = g_hash_table_get_keys (set);
4343   for (l = keys; l != NULL; l = l->next)
4344     g_ptr_array_add (p, l->data);
4345   g_hash_table_unref (set);
4346   g_list_free (keys);
4347
4348   g_ptr_array_add (p, NULL);
4349   ret = (gchar **) g_ptr_array_free (p, FALSE);
4350   return ret;
4351 }
4352
4353 static gchar **
4354 g_dbus_connection_list_registered (GDBusConnection *connection,
4355                                    const gchar     *path)
4356 {
4357   gchar **ret;
4358   CONNECTION_LOCK (connection);
4359   ret = g_dbus_connection_list_registered_unlocked (connection, path);
4360   CONNECTION_UNLOCK (connection);
4361   return ret;
4362 }
4363
4364 /* called in message handler thread with lock held */
4365 static gboolean
4366 handle_introspect (GDBusConnection *connection,
4367                    ExportedObject  *eo,
4368                    GDBusMessage    *message)
4369 {
4370   guint n;
4371   GString *s;
4372   GDBusMessage *reply;
4373   GHashTableIter hash_iter;
4374   ExportedInterface *ei;
4375   gchar **registered;
4376
4377   /* first the header with the standard interfaces */
4378   s = g_string_sized_new (sizeof (introspect_header) +
4379                           sizeof (introspect_properties_interface) +
4380                           sizeof (introspect_introspectable_interface) +
4381                           sizeof (introspect_tail));
4382   introspect_append_header (s);
4383   if (!g_hash_table_lookup (eo->map_if_name_to_ei,
4384                             "org.freedesktop.DBus.Properties"))
4385     g_string_append (s, introspect_properties_interface);
4386
4387   if (!g_hash_table_lookup (eo->map_if_name_to_ei,
4388                             "org.freedesktop.DBus.Introspectable"))
4389     g_string_append (s, introspect_introspectable_interface);
4390
4391   /* then include the registered interfaces */
4392   g_hash_table_iter_init (&hash_iter, eo->map_if_name_to_ei);
4393   while (g_hash_table_iter_next (&hash_iter, NULL, (gpointer) &ei))
4394     g_dbus_interface_info_generate_xml (ei->interface_info, 2, s);
4395
4396   /* finally include nodes registered below us */
4397   registered = g_dbus_connection_list_registered_unlocked (connection, eo->object_path);
4398   for (n = 0; registered != NULL && registered[n] != NULL; n++)
4399     g_string_append_printf (s, "  <node name=\"%s\"/>\n", registered[n]);
4400   g_strfreev (registered);
4401   g_string_append (s, introspect_tail);
4402
4403   reply = g_dbus_message_new_method_reply (message);
4404   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
4405   g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4406   g_object_unref (reply);
4407   g_string_free (s, TRUE);
4408
4409   return TRUE;
4410 }
4411
4412 /* called in thread where object was registered - no locks held */
4413 static gboolean
4414 call_in_idle_cb (gpointer user_data)
4415 {
4416   GDBusMethodInvocation *invocation = G_DBUS_METHOD_INVOCATION (user_data);
4417   GDBusInterfaceVTable *vtable;
4418   guint registration_id;
4419   guint subtree_registration_id;
4420
4421   vtable = g_object_get_data (G_OBJECT (invocation), "g-dbus-interface-vtable");
4422   g_assert (vtable != NULL && vtable->method_call != NULL);
4423
4424   registration_id = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (invocation), "g-dbus-registration-id"));
4425   subtree_registration_id = GPOINTER_TO_UINT (g_object_get_data (G_OBJECT (invocation), "g-dbus-subtree-registration-id"));
4426
4427   if (has_object_been_unregistered (g_dbus_method_invocation_get_connection (invocation),
4428                                     registration_id,
4429                                     subtree_registration_id))
4430     {
4431       GDBusMessage *reply;
4432       reply = g_dbus_message_new_method_error (g_dbus_method_invocation_get_message (invocation),
4433                                                "org.freedesktop.DBus.Error.UnknownMethod",
4434                                                _("No such interface `%s' on object at path %s"),
4435                                                g_dbus_method_invocation_get_interface_name (invocation),
4436                                                g_dbus_method_invocation_get_object_path (invocation));
4437       g_dbus_connection_send_message (g_dbus_method_invocation_get_connection (invocation), reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4438       g_object_unref (reply);
4439       goto out;
4440     }
4441
4442   vtable->method_call (g_dbus_method_invocation_get_connection (invocation),
4443                        g_dbus_method_invocation_get_sender (invocation),
4444                        g_dbus_method_invocation_get_object_path (invocation),
4445                        g_dbus_method_invocation_get_interface_name (invocation),
4446                        g_dbus_method_invocation_get_method_name (invocation),
4447                        g_dbus_method_invocation_get_parameters (invocation),
4448                        g_object_ref (invocation),
4449                        g_dbus_method_invocation_get_user_data (invocation));
4450
4451  out:
4452   return FALSE;
4453 }
4454
4455 /* called in message handler thread with lock held */
4456 static gboolean
4457 validate_and_maybe_schedule_method_call (GDBusConnection            *connection,
4458                                          GDBusMessage               *message,
4459                                          guint                       registration_id,
4460                                          guint                       subtree_registration_id,
4461                                          GDBusInterfaceInfo         *interface_info,
4462                                          const GDBusInterfaceVTable *vtable,
4463                                          GMainContext               *main_context,
4464                                          gpointer                    user_data)
4465 {
4466   GDBusMethodInvocation *invocation;
4467   const GDBusMethodInfo *method_info;
4468   GDBusMessage *reply;
4469   GVariant *parameters;
4470   GSource *idle_source;
4471   gboolean handled;
4472   GVariantType *in_type;
4473
4474   handled = FALSE;
4475
4476   /* TODO: the cost of this is O(n) - it might be worth caching the result */
4477   method_info = g_dbus_interface_info_lookup_method (interface_info, g_dbus_message_get_member (message));
4478
4479   /* if the method doesn't exist, return the org.freedesktop.DBus.Error.UnknownMethod
4480    * error to the caller
4481    */
4482   if (method_info == NULL)
4483     {
4484       reply = g_dbus_message_new_method_error (message,
4485                                                "org.freedesktop.DBus.Error.UnknownMethod",
4486                                                _("No such method `%s'"),
4487                                                g_dbus_message_get_member (message));
4488       g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4489       g_object_unref (reply);
4490       handled = TRUE;
4491       goto out;
4492     }
4493
4494   parameters = g_dbus_message_get_body (message);
4495   if (parameters == NULL)
4496     {
4497       parameters = g_variant_new ("()");
4498       g_variant_ref_sink (parameters);
4499     }
4500   else
4501     {
4502       g_variant_ref (parameters);
4503     }
4504
4505   /* Check that the incoming args are of the right type - if they are not, return
4506    * the org.freedesktop.DBus.Error.InvalidArgs error to the caller
4507    */
4508   in_type = _g_dbus_compute_complete_signature (method_info->in_args);
4509   if (!g_variant_is_of_type (parameters, in_type))
4510     {
4511       gchar *type_string;
4512
4513       type_string = g_variant_type_dup_string (in_type);
4514
4515       reply = g_dbus_message_new_method_error (message,
4516                                                "org.freedesktop.DBus.Error.InvalidArgs",
4517                                                _("Type of message, `%s', does not match expected type `%s'"),
4518                                                g_variant_get_type_string (parameters),
4519                                                type_string);
4520       g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
4521       g_variant_type_free (in_type);
4522       g_variant_unref (parameters);
4523       g_object_unref (reply);
4524       g_free (type_string);
4525       handled = TRUE;
4526       goto out;
4527     }
4528   g_variant_type_free (in_type);
4529
4530   /* schedule the call in idle */
4531   invocation = _g_dbus_method_invocation_new (g_dbus_message_get_sender (message),
4532                                               g_dbus_message_get_path (message),
4533                                               g_dbus_message_get_interface (message),
4534                                               g_dbus_message_get_member (message),
4535                                               method_info,
4536                                               connection,
4537                                               message,
4538                                               parameters,
4539                                               user_data);
4540   g_variant_unref (parameters);
4541
4542   /* TODO: would be nicer with a real MethodData like we already
4543    * have PropertyData and PropertyGetAllData... */
4544   g_object_set_data (G_OBJECT (invocation), "g-dbus-interface-vtable", (gpointer) vtable);
4545   g_object_set_data (G_OBJECT (invocation), "g-dbus-registration-id", GUINT_TO_POINTER (registration_id));
4546   g_object_set_data (G_OBJECT (invocation), "g-dbus-subtree-registration-id", GUINT_TO_POINTER (subtree_registration_id));
4547
4548   idle_source = g_idle_source_new ();
4549   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
4550   g_source_set_callback (idle_source,
4551                          call_in_idle_cb,
4552                          invocation,
4553                          g_object_unref);
4554   g_source_attach (idle_source, main_context);
4555   g_source_unref (idle_source);
4556
4557   handled = TRUE;
4558
4559  out:
4560   return handled;
4561 }
4562
4563 /* ---------------------------------------------------------------------------------------------------- */
4564
4565 /* called in message handler thread with lock held */
4566 static gboolean
4567 obj_message_func (GDBusConnection *connection,
4568                   ExportedObject  *eo,
4569                   GDBusMessage    *message)
4570 {
4571   const gchar *interface_name;
4572   const gchar *member;
4573   const gchar *signature;
4574   gboolean handled;
4575
4576   handled = FALSE;
4577
4578   interface_name = g_dbus_message_get_interface (message);
4579   member = g_dbus_message_get_member (message);
4580   signature = g_dbus_message_get_signature (message);
4581
4582   /* see if we have an interface for handling this call */
4583   if (interface_name != NULL)
4584     {
4585       ExportedInterface *ei;
4586       ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_name);
4587       if (ei != NULL)
4588         {
4589           /* we do - invoke the handler in idle in the right thread */
4590
4591           /* handle no vtable or handler being present */
4592           if (ei->vtable == NULL || ei->vtable->method_call == NULL)
4593             goto out;
4594
4595           handled = validate_and_maybe_schedule_method_call (connection,
4596                                                              message,
4597                                                              ei->id,
4598                                                              0,
4599                                                              ei->interface_info,
4600                                                              ei->vtable,
4601                                                              ei->context,
4602                                                              ei->user_data);
4603           goto out;
4604         }
4605     }
4606
4607   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
4608       g_strcmp0 (member, "Introspect") == 0 &&
4609       g_strcmp0 (signature, "") == 0)
4610     {
4611       handled = handle_introspect (connection, eo, message);
4612       goto out;
4613     }
4614   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
4615            g_strcmp0 (member, "Get") == 0 &&
4616            g_strcmp0 (signature, "ss") == 0)
4617     {
4618       handled = handle_getset_property (connection, eo, message, TRUE);
4619       goto out;
4620     }
4621   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
4622            g_strcmp0 (member, "Set") == 0 &&
4623            g_strcmp0 (signature, "ssv") == 0)
4624     {
4625       handled = handle_getset_property (connection, eo, message, FALSE);
4626       goto out;
4627     }
4628   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0 &&
4629            g_strcmp0 (member, "GetAll") == 0 &&
4630            g_strcmp0 (signature, "s") == 0)
4631     {
4632       handled = handle_get_all_properties (connection, eo, message);
4633       goto out;
4634     }
4635
4636  out:
4637   return handled;
4638 }
4639
4640 /**
4641  * g_dbus_connection_register_object:
4642  * @connection: A #GDBusConnection.
4643  * @object_path: The object path to register at.
4644  * @interface_info: Introspection data for the interface.
4645  * @vtable: (allow-none): A #GDBusInterfaceVTable to call into or %NULL.
4646  * @user_data: Data to pass to functions in @vtable.
4647  * @user_data_free_func: Function to call when the object path is unregistered.
4648  * @error: Return location for error or %NULL.
4649  *
4650  * Registers callbacks for exported objects at @object_path with the
4651  * D-Bus interface that is described in @interface_info.
4652  *
4653  * Calls to functions in @vtable (and @user_data_free_func) will
4654  * happen in the <link linkend="g-main-context-push-thread-default">thread-default main
4655  * loop</link> of the thread you are calling this method from.
4656  *
4657  * Note that all #GVariant values passed to functions in @vtable will match
4658  * the signature given in @interface_info - if a remote caller passes
4659  * incorrect values, the <literal>org.freedesktop.DBus.Error.InvalidArgs</literal>
4660  * is returned to the remote caller.
4661  *
4662  * Additionally, if the remote caller attempts to invoke methods or
4663  * access properties not mentioned in @interface_info the
4664  * <literal>org.freedesktop.DBus.Error.UnknownMethod</literal> resp.
4665  * <literal>org.freedesktop.DBus.Error.InvalidArgs</literal> errors
4666  * are returned to the caller.
4667  *
4668  * It is considered a programming error if the
4669  * #GDBusInterfaceGetPropertyFunc function in @vtable returns a
4670  * #GVariant of incorrect type.
4671  *
4672  * If an existing callback is already registered at @object_path and
4673  * @interface_name, then @error is set to #G_IO_ERROR_EXISTS.
4674  *
4675  * GDBus automatically implements the standard D-Bus interfaces
4676  * org.freedesktop.DBus.Properties, org.freedesktop.DBus.Introspectable
4677  * and org.freedesktop.Peer, so you don't have to implement those for
4678  * the objects you export. You <emphasis>can</emphasis> implement
4679  * org.freedesktop.DBus.Properties yourself, e.g. to handle getting
4680  * and setting of properties asynchronously.
4681  *
4682  * Note that the reference count on @interface_info will be
4683  * incremented by 1 (unless allocated statically, e.g. if the
4684  * reference count is -1, see g_dbus_interface_info_ref()) for as long
4685  * as the object is exported. Also note that @vtable will be copied.
4686  *
4687  * See <xref linkend="gdbus-server"/> for an example of how to use this method.
4688  *
4689  * Returns: 0 if @error is set, otherwise a registration id (never 0)
4690  * that can be used with g_dbus_connection_unregister_object() .
4691  *
4692  * Since: 2.26
4693  */
4694 guint
4695 g_dbus_connection_register_object (GDBusConnection            *connection,
4696                                    const gchar                *object_path,
4697                                    GDBusInterfaceInfo         *interface_info,
4698                                    const GDBusInterfaceVTable *vtable,
4699                                    gpointer                    user_data,
4700                                    GDestroyNotify              user_data_free_func,
4701                                    GError                    **error)
4702 {
4703   ExportedObject *eo;
4704   ExportedInterface *ei;
4705   guint ret;
4706
4707   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
4708   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
4709   g_return_val_if_fail (interface_info != NULL, 0);
4710   g_return_val_if_fail (g_dbus_is_interface_name (interface_info->name), 0);
4711   g_return_val_if_fail (error == NULL || *error == NULL, 0);
4712
4713   ret = 0;
4714
4715   CONNECTION_LOCK (connection);
4716
4717   eo = g_hash_table_lookup (connection->map_object_path_to_eo, object_path);
4718   if (eo == NULL)
4719     {
4720       eo = g_new0 (ExportedObject, 1);
4721       eo->object_path = g_strdup (object_path);
4722       eo->connection = connection;
4723       eo->map_if_name_to_ei = g_hash_table_new_full (g_str_hash,
4724                                                      g_str_equal,
4725                                                      NULL,
4726                                                      (GDestroyNotify) exported_interface_free);
4727       g_hash_table_insert (connection->map_object_path_to_eo, eo->object_path, eo);
4728     }
4729
4730   ei = g_hash_table_lookup (eo->map_if_name_to_ei, interface_info->name);
4731   if (ei != NULL)
4732     {
4733       g_set_error (error,
4734                    G_IO_ERROR,
4735                    G_IO_ERROR_EXISTS,
4736                    _("An object is already exported for the interface %s at %s"),
4737                    interface_info->name,
4738                    object_path);
4739       goto out;
4740     }
4741
4742   ei = g_new0 (ExportedInterface, 1);
4743   ei->id = _global_registration_id++; /* TODO: overflow etc. */
4744   ei->eo = eo;
4745   ei->user_data = user_data;
4746   ei->user_data_free_func = user_data_free_func;
4747   ei->vtable = _g_dbus_interface_vtable_copy (vtable);
4748   ei->interface_info = g_dbus_interface_info_ref (interface_info);
4749   g_dbus_interface_info_cache_build (ei->interface_info);
4750   ei->interface_name = g_strdup (interface_info->name);
4751   ei->context = g_main_context_get_thread_default ();
4752   if (ei->context != NULL)
4753     g_main_context_ref (ei->context);
4754
4755   g_hash_table_insert (eo->map_if_name_to_ei,
4756                        (gpointer) ei->interface_name,
4757                        ei);
4758   g_hash_table_insert (connection->map_id_to_ei,
4759                        GUINT_TO_POINTER (ei->id),
4760                        ei);
4761
4762   ret = ei->id;
4763
4764  out:
4765   CONNECTION_UNLOCK (connection);
4766
4767   return ret;
4768 }
4769
4770 /**
4771  * g_dbus_connection_unregister_object:
4772  * @connection: A #GDBusConnection.
4773  * @registration_id: A registration id obtained from g_dbus_connection_register_object().
4774  *
4775  * Unregisters an object.
4776  *
4777  * Returns: %TRUE if the object was unregistered, %FALSE otherwise.
4778  *
4779  * Since: 2.26
4780  */
4781 gboolean
4782 g_dbus_connection_unregister_object (GDBusConnection *connection,
4783                                      guint            registration_id)
4784 {
4785   ExportedInterface *ei;
4786   ExportedObject *eo;
4787   gboolean ret;
4788
4789   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
4790
4791   ret = FALSE;
4792
4793   CONNECTION_LOCK (connection);
4794
4795   ei = g_hash_table_lookup (connection->map_id_to_ei,
4796                             GUINT_TO_POINTER (registration_id));
4797   if (ei == NULL)
4798     goto out;
4799
4800   eo = ei->eo;
4801
4802   g_warn_if_fail (g_hash_table_remove (connection->map_id_to_ei, GUINT_TO_POINTER (ei->id)));
4803   g_warn_if_fail (g_hash_table_remove (eo->map_if_name_to_ei, ei->interface_name));
4804   /* unregister object path if we have no more exported interfaces */
4805   if (g_hash_table_size (eo->map_if_name_to_ei) == 0)
4806     g_warn_if_fail (g_hash_table_remove (connection->map_object_path_to_eo,
4807                                          eo->object_path));
4808
4809   ret = TRUE;
4810
4811  out:
4812   CONNECTION_UNLOCK (connection);
4813
4814   return ret;
4815 }
4816
4817 /* ---------------------------------------------------------------------------------------------------- */
4818
4819 /**
4820  * g_dbus_connection_emit_signal:
4821  * @connection: A #GDBusConnection.
4822  * @destination_bus_name: (allow-none): The unique bus name for the destination
4823  *                        for the signal or %NULL to emit to all listeners.
4824  * @object_path: Path of remote object.
4825  * @interface_name: D-Bus interface to emit a signal on.
4826  * @signal_name: The name of the signal to emit.
4827  * @parameters: (allow-none): A #GVariant tuple with parameters for the signal
4828  *              or %NULL if not passing parameters.
4829  * @error: Return location for error or %NULL.
4830  *
4831  * Emits a signal.
4832  *
4833  * If the parameters GVariant is floating, it is consumed.
4834  *
4835  * This can only fail if @parameters is not compatible with the D-Bus protocol.
4836  *
4837  * Returns: %TRUE unless @error is set.
4838  *
4839  * Since: 2.26
4840  */
4841 gboolean
4842 g_dbus_connection_emit_signal (GDBusConnection  *connection,
4843                                const gchar      *destination_bus_name,
4844                                const gchar      *object_path,
4845                                const gchar      *interface_name,
4846                                const gchar      *signal_name,
4847                                GVariant         *parameters,
4848                                GError          **error)
4849 {
4850   GDBusMessage *message;
4851   gboolean ret;
4852
4853   message = NULL;
4854   ret = FALSE;
4855
4856   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
4857   g_return_val_if_fail (destination_bus_name == NULL || g_dbus_is_name (destination_bus_name), FALSE);
4858   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), FALSE);
4859   g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), FALSE);
4860   g_return_val_if_fail (signal_name != NULL && g_dbus_is_member_name (signal_name), FALSE);
4861   g_return_val_if_fail (parameters == NULL || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), FALSE);
4862
4863   if (G_UNLIKELY (_g_dbus_debug_emission ()))
4864     {
4865       _g_dbus_debug_print_lock ();
4866       g_print ("========================================================================\n"
4867                "GDBus-debug:Emission:\n"
4868                " >>>> SIGNAL EMISSION %s.%s()\n"
4869                "      on object %s\n"
4870                "      destination %s\n",
4871                interface_name, signal_name,
4872                object_path,
4873                destination_bus_name != NULL ? destination_bus_name : "(none)");
4874       _g_dbus_debug_print_unlock ();
4875     }
4876
4877   message = g_dbus_message_new_signal (object_path,
4878                                        interface_name,
4879                                        signal_name);
4880
4881   if (destination_bus_name != NULL)
4882     g_dbus_message_set_header (message,
4883                                G_DBUS_MESSAGE_HEADER_FIELD_DESTINATION,
4884                                g_variant_new_string (destination_bus_name));
4885
4886   if (parameters != NULL)
4887     g_dbus_message_set_body (message, parameters);
4888
4889   ret = g_dbus_connection_send_message (connection, message, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, error);
4890   g_object_unref (message);
4891
4892   return ret;
4893 }
4894
4895 static void
4896 add_call_flags (GDBusMessage           *message,
4897                          GDBusCallFlags  flags)
4898 {
4899   if (flags & G_DBUS_CALL_FLAGS_NO_AUTO_START)
4900     g_dbus_message_set_flags (message, G_DBUS_MESSAGE_FLAGS_NO_AUTO_START);
4901 }
4902
4903 static GVariant *
4904 decode_method_reply (GDBusMessage        *reply,
4905                      const gchar         *method_name,
4906                      const GVariantType  *reply_type,
4907                      GError             **error)
4908 {
4909   GVariant *result;
4910
4911   result = NULL;
4912   switch (g_dbus_message_get_message_type (reply))
4913     {
4914     case G_DBUS_MESSAGE_TYPE_METHOD_RETURN:
4915       result = g_dbus_message_get_body (reply);
4916       if (result == NULL)
4917         {
4918           result = g_variant_new ("()");
4919           g_variant_ref_sink (result);
4920         }
4921       else
4922         {
4923           g_variant_ref (result);
4924         }
4925
4926       if (!g_variant_is_of_type (result, reply_type))
4927         {
4928           gchar *type_string = g_variant_type_dup_string (reply_type);
4929
4930           g_set_error (error,
4931                        G_IO_ERROR,
4932                        G_IO_ERROR_INVALID_ARGUMENT,
4933                        _("Method `%s' returned type `%s', but expected `%s'"),
4934                        method_name, g_variant_get_type_string (result), type_string);
4935
4936           g_variant_unref (result);
4937           g_free (type_string);
4938           result = NULL;
4939         }
4940       break;
4941
4942     case G_DBUS_MESSAGE_TYPE_ERROR:
4943       g_dbus_message_to_gerror (reply, error);
4944       break;
4945
4946     default:
4947       g_assert_not_reached ();
4948       break;
4949     }
4950
4951   return result;
4952 }
4953
4954
4955 typedef struct
4956 {
4957   GSimpleAsyncResult *simple;
4958   GVariantType *reply_type;
4959   gchar *method_name; /* for error message */
4960   guint32 serial;
4961 } CallState;
4962
4963 static void
4964 g_dbus_connection_call_done (GObject      *source,
4965                              GAsyncResult *result,
4966                              gpointer      user_data)
4967 {
4968   GDBusConnection *connection = G_DBUS_CONNECTION (source);
4969   CallState *state = user_data;
4970   GError *error;
4971   GDBusMessage *reply;
4972   GVariant *value;
4973
4974   error = NULL;
4975   reply = g_dbus_connection_send_message_with_reply_finish (connection,
4976                                                             result,
4977                                                             &error);
4978
4979   if (G_UNLIKELY (_g_dbus_debug_call ()))
4980     {
4981       _g_dbus_debug_print_lock ();
4982       g_print ("========================================================================\n"
4983                "GDBus-debug:Call:\n"
4984                " <<<< ASYNC COMPLETE %s() (serial %d)\n"
4985                "      ",
4986                state->method_name,
4987                state->serial);
4988       if (reply != NULL)
4989         {
4990           g_print ("SUCCESS\n");
4991         }
4992       else
4993         {
4994           g_print ("FAILED: %s\n",
4995                    error->message);
4996         }
4997       _g_dbus_debug_print_unlock ();
4998     }
4999
5000
5001   if (reply != NULL)
5002     {
5003       value = decode_method_reply (reply, state->method_name,
5004                                    state->reply_type, &error);
5005       g_object_unref (reply);
5006     }
5007   else
5008     value = NULL;
5009
5010   if (value == NULL)
5011     g_simple_async_result_take_error (state->simple, error);
5012   else
5013     g_simple_async_result_set_op_res_gpointer (state->simple, value,
5014                                                (GDestroyNotify) g_variant_unref);
5015
5016   g_simple_async_result_complete (state->simple);
5017   g_variant_type_free (state->reply_type);
5018   g_object_unref (state->simple);
5019   g_free (state->method_name);
5020
5021   g_slice_free (CallState, state);
5022 }
5023
5024 /**
5025  * g_dbus_connection_call:
5026  * @connection: A #GDBusConnection.
5027  * @bus_name: (allow-none): A unique or well-known bus name or %NULL if
5028  *            @connection is not a message bus connection.
5029  * @object_path: Path of remote object.
5030  * @interface_name: D-Bus interface to invoke method on.
5031  * @method_name: The name of the method to invoke.
5032  * @parameters: (allow-none): A #GVariant tuple with parameters for the method
5033  *              or %NULL if not passing parameters.
5034  * @reply_type: (allow-none): The expected type of the reply, or %NULL.
5035  * @flags: Flags from the #GDBusCallFlags enumeration.
5036  * @timeout_msec: The timeout in milliseconds, -1 to use the default
5037  *                timeout or %G_MAXINT for no timeout.
5038  * @cancellable: A #GCancellable or %NULL.
5039  * @callback: (allow-none): A #GAsyncReadyCallback to call when the request is
5040  *            satisfied or %NULL if you don't * care about the result of the
5041  *            method invocation.
5042  * @user_data: The data to pass to @callback.
5043  *
5044  * Asynchronously invokes the @method_name method on the
5045  * @interface_name D-Bus interface on the remote object at
5046  * @object_path owned by @bus_name.
5047  *
5048  * If @connection is closed then the operation will fail with
5049  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
5050  * fail with %G_IO_ERROR_CANCELLED. If @parameters contains a value
5051  * not compatible with the D-Bus protocol, the operation fails with
5052  * %G_IO_ERROR_INVALID_ARGUMENT.
5053  *
5054  * If @reply_type is non-%NULL then the reply will be checked for having this type and an
5055  * error will be raised if it does not match.  Said another way, if you give a @reply_type
5056  * then any non-%NULL return value will be of this type.
5057  *
5058  * If the @parameters #GVariant is floating, it is consumed. This allows
5059  * convenient 'inline' use of g_variant_new(), e.g.:
5060  * |[
5061  *  g_dbus_connection_call (connection,
5062  *                          "org.freedesktop.StringThings",
5063  *                          "/org/freedesktop/StringThings",
5064  *                          "org.freedesktop.StringThings",
5065  *                          "TwoStrings",
5066  *                          g_variant_new ("(ss)",
5067  *                                         "Thing One",
5068  *                                         "Thing Two"),
5069  *                          NULL,
5070  *                          G_DBUS_CALL_FLAGS_NONE,
5071  *                          -1,
5072  *                          NULL,
5073  *                          (GAsyncReadyCallback) two_strings_done,
5074  *                          NULL);
5075  * ]|
5076  *
5077  * This is an asynchronous method. When the operation is finished, @callback will be invoked
5078  * in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
5079  * of the thread you are calling this method from. You can then call
5080  * g_dbus_connection_call_finish() to get the result of the operation.
5081  * See g_dbus_connection_call_sync() for the synchronous version of this
5082  * function.
5083  *
5084  * Since: 2.26
5085  */
5086 void
5087 g_dbus_connection_call (GDBusConnection        *connection,
5088                         const gchar            *bus_name,
5089                         const gchar            *object_path,
5090                         const gchar            *interface_name,
5091                         const gchar            *method_name,
5092                         GVariant               *parameters,
5093                         const GVariantType     *reply_type,
5094                         GDBusCallFlags          flags,
5095                         gint                    timeout_msec,
5096                         GCancellable           *cancellable,
5097                         GAsyncReadyCallback     callback,
5098                         gpointer                user_data)
5099 {
5100   GDBusMessage *message;
5101   CallState *state;
5102
5103   g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
5104   g_return_if_fail (bus_name == NULL || g_dbus_is_name (bus_name));
5105   g_return_if_fail (object_path != NULL && g_variant_is_object_path (object_path));
5106   g_return_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name));
5107   g_return_if_fail (method_name != NULL && g_dbus_is_member_name (method_name));
5108   g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);
5109   g_return_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE));
5110
5111   state = g_slice_new (CallState);
5112   state->simple = g_simple_async_result_new (G_OBJECT (connection),
5113                                              callback, user_data,
5114                                              g_dbus_connection_call);
5115   state->method_name = g_strjoin (".", interface_name, method_name, NULL);
5116
5117   if (reply_type == NULL)
5118     reply_type = G_VARIANT_TYPE_ANY;
5119
5120   state->reply_type = g_variant_type_copy (reply_type);
5121
5122   message = g_dbus_message_new_method_call (bus_name,
5123                                             object_path,
5124                                             interface_name,
5125                                             method_name);
5126   add_call_flags (message, flags);
5127   if (parameters != NULL)
5128     g_dbus_message_set_body (message, parameters);
5129
5130   g_dbus_connection_send_message_with_reply (connection,
5131                                              message,
5132                                              G_DBUS_SEND_MESSAGE_FLAGS_NONE,
5133                                              timeout_msec,
5134                                              &state->serial,
5135                                              cancellable,
5136                                              g_dbus_connection_call_done,
5137                                              state);
5138
5139   if (G_UNLIKELY (_g_dbus_debug_call ()))
5140     {
5141       _g_dbus_debug_print_lock ();
5142       g_print ("========================================================================\n"
5143                "GDBus-debug:Call:\n"
5144                " >>>> ASYNC %s.%s()\n"
5145                "      on object %s\n"
5146                "      owned by name %s (serial %d)\n",
5147                interface_name,
5148                method_name,
5149                object_path,
5150                bus_name != NULL ? bus_name : "(none)",
5151                state->serial);
5152       _g_dbus_debug_print_unlock ();
5153     }
5154
5155   if (message != NULL)
5156     g_object_unref (message);
5157 }
5158
5159 /**
5160  * g_dbus_connection_call_finish:
5161  * @connection: A #GDBusConnection.
5162  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_call().
5163  * @error: Return location for error or %NULL.
5164  *
5165  * Finishes an operation started with g_dbus_connection_call().
5166  *
5167  * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
5168  * return values. Free with g_variant_unref().
5169  *
5170  * Since: 2.26
5171  */
5172 GVariant *
5173 g_dbus_connection_call_finish (GDBusConnection  *connection,
5174                                GAsyncResult     *res,
5175                                GError          **error)
5176 {
5177   GSimpleAsyncResult *simple;
5178
5179   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
5180   g_return_val_if_fail (g_simple_async_result_is_valid (res, G_OBJECT (connection),
5181                                                         g_dbus_connection_call), NULL);
5182   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
5183
5184   simple = G_SIMPLE_ASYNC_RESULT (res);
5185
5186   if (g_simple_async_result_propagate_error (simple, error))
5187     return NULL;
5188
5189   return g_variant_ref (g_simple_async_result_get_op_res_gpointer (simple));
5190 }
5191
5192 /* ---------------------------------------------------------------------------------------------------- */
5193
5194 /**
5195  * g_dbus_connection_call_sync:
5196  * @connection: A #GDBusConnection.
5197  * @bus_name: A unique or well-known bus name.
5198  * @object_path: Path of remote object.
5199  * @interface_name: D-Bus interface to invoke method on.
5200  * @method_name: The name of the method to invoke.
5201  * @parameters: (allow-none): A #GVariant tuple with parameters for the method
5202  *              or %NULL if not passing parameters.
5203  * @reply_type: (allow-none): The expected type of the reply, or %NULL.
5204  * @flags: Flags from the #GDBusCallFlags enumeration.
5205  * @timeout_msec: The timeout in milliseconds, -1 to use the default
5206  *                timeout or %G_MAXINT for no timeout.
5207  * @cancellable: A #GCancellable or %NULL.
5208  * @error: Return location for error or %NULL.
5209  *
5210  * Synchronously invokes the @method_name method on the
5211  * @interface_name D-Bus interface on the remote object at
5212  * @object_path owned by @bus_name.
5213  *
5214  * If @connection is closed then the operation will fail with
5215  * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the
5216  * operation will fail with %G_IO_ERROR_CANCELLED. If @parameters
5217  * contains a value not compatible with the D-Bus protocol, the operation
5218  * fails with %G_IO_ERROR_INVALID_ARGUMENT.
5219
5220  * If @reply_type is non-%NULL then the reply will be checked for having
5221  * this type and an error will be raised if it does not match.  Said
5222  * another way, if you give a @reply_type then any non-%NULL return
5223  * value will be of this type.
5224  *
5225  * If the @parameters #GVariant is floating, it is consumed.
5226  * This allows convenient 'inline' use of g_variant_new(), e.g.:
5227  * |[
5228  *  g_dbus_connection_call_sync (connection,
5229  *                               "org.freedesktop.StringThings",
5230  *                               "/org/freedesktop/StringThings",
5231  *                               "org.freedesktop.StringThings",
5232  *                               "TwoStrings",
5233  *                               g_variant_new ("(ss)",
5234  *                                              "Thing One",
5235  *                                              "Thing Two"),
5236  *                               NULL,
5237  *                               G_DBUS_CALL_FLAGS_NONE,
5238  *                               -1,
5239  *                               NULL,
5240  *                               &amp;error);
5241  * ]|
5242  *
5243  * The calling thread is blocked until a reply is received. See
5244  * g_dbus_connection_call() for the asynchronous version of
5245  * this method.
5246  *
5247  * Returns: %NULL if @error is set. Otherwise a #GVariant tuple with
5248  * return values. Free with g_variant_unref().
5249  *
5250  * Since: 2.26
5251  */
5252 GVariant *
5253 g_dbus_connection_call_sync (GDBusConnection         *connection,
5254                              const gchar             *bus_name,
5255                              const gchar             *object_path,
5256                              const gchar             *interface_name,
5257                              const gchar             *method_name,
5258                              GVariant                *parameters,
5259                              const GVariantType      *reply_type,
5260                              GDBusCallFlags           flags,
5261                              gint                     timeout_msec,
5262                              GCancellable            *cancellable,
5263                              GError                 **error)
5264 {
5265   GDBusMessage *message;
5266   GDBusMessage *reply;
5267   GVariant *result;
5268   GError *local_error;
5269
5270   message = NULL;
5271   reply = NULL;
5272   result = NULL;
5273
5274   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
5275   g_return_val_if_fail (bus_name == NULL || g_dbus_is_name (bus_name), NULL);
5276   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), NULL);
5277   g_return_val_if_fail (interface_name != NULL && g_dbus_is_interface_name (interface_name), NULL);
5278   g_return_val_if_fail (method_name != NULL && g_dbus_is_member_name (method_name), NULL);
5279   g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
5280   g_return_val_if_fail ((parameters == NULL) || g_variant_is_of_type (parameters, G_VARIANT_TYPE_TUPLE), NULL);
5281
5282   if (reply_type == NULL)
5283     reply_type = G_VARIANT_TYPE_ANY;
5284
5285   message = g_dbus_message_new_method_call (bus_name,
5286                                             object_path,
5287                                             interface_name,
5288                                             method_name);
5289   add_call_flags (message, flags);
5290   if (parameters != NULL)
5291     g_dbus_message_set_body (message, parameters);
5292
5293   if (G_UNLIKELY (_g_dbus_debug_call ()))
5294     {
5295       _g_dbus_debug_print_lock ();
5296       g_print ("========================================================================\n"
5297                "GDBus-debug:Call:\n"
5298                " >>>> SYNC %s.%s()\n"
5299                "      on object %s\n"
5300                "      owned by name %s\n",
5301                interface_name,
5302                method_name,
5303                object_path,
5304                bus_name != NULL ? bus_name : "(none)");
5305       _g_dbus_debug_print_unlock ();
5306     }
5307
5308   local_error = NULL;
5309   reply = g_dbus_connection_send_message_with_reply_sync (connection,
5310                                                           message,
5311                                                           G_DBUS_SEND_MESSAGE_FLAGS_NONE,
5312                                                           timeout_msec,
5313                                                           NULL, /* volatile guint32 *out_serial */
5314                                                           cancellable,
5315                                                           &local_error);
5316
5317   if (G_UNLIKELY (_g_dbus_debug_call ()))
5318     {
5319       _g_dbus_debug_print_lock ();
5320       g_print ("========================================================================\n"
5321                "GDBus-debug:Call:\n"
5322                " <<<< SYNC COMPLETE %s.%s()\n"
5323                "      ",
5324                interface_name,
5325                method_name);
5326       if (reply != NULL)
5327         {
5328           g_print ("SUCCESS\n");
5329         }
5330       else
5331         {
5332           g_print ("FAILED: %s\n",
5333                    local_error->message);
5334         }
5335       _g_dbus_debug_print_unlock ();
5336     }
5337
5338   if (reply == NULL)
5339     {
5340       if (error != NULL)
5341         *error = local_error;
5342       else
5343         g_error_free (local_error);
5344       goto out;
5345     }
5346
5347   result = decode_method_reply (reply, method_name, reply_type, error);
5348
5349  out:
5350   if (message != NULL)
5351     g_object_unref (message);
5352   if (reply != NULL)
5353     g_object_unref (reply);
5354
5355   return result;
5356 }
5357
5358 /* ---------------------------------------------------------------------------------------------------- */
5359
5360 struct ExportedSubtree
5361 {
5362   guint                     id;
5363   gchar                    *object_path;
5364   GDBusConnection          *connection;
5365   GDBusSubtreeVTable       *vtable;
5366   GDBusSubtreeFlags         flags;
5367
5368   GMainContext             *context;
5369   gpointer                  user_data;
5370   GDestroyNotify            user_data_free_func;
5371 };
5372
5373 static void
5374 exported_subtree_free (ExportedSubtree *es)
5375 {
5376   call_destroy_notify (es->context,
5377                        es->user_data_free_func,
5378                        es->user_data);
5379
5380   if (es->context != NULL)
5381     g_main_context_unref (es->context);
5382
5383   _g_dbus_subtree_vtable_free (es->vtable);
5384   g_free (es->object_path);
5385   g_free (es);
5386 }
5387
5388 /* called without lock held */
5389 static gboolean
5390 handle_subtree_introspect (GDBusConnection *connection,
5391                            ExportedSubtree *es,
5392                            GDBusMessage    *message)
5393 {
5394   GString *s;
5395   gboolean handled;
5396   GDBusMessage *reply;
5397   gchar **children;
5398   gboolean is_root;
5399   const gchar *sender;
5400   const gchar *requested_object_path;
5401   const gchar *requested_node;
5402   GDBusInterfaceInfo **interfaces;
5403   guint n;
5404   gchar **subnode_paths;
5405   gboolean has_properties_interface;
5406   gboolean has_introspectable_interface;
5407
5408   handled = FALSE;
5409
5410   requested_object_path = g_dbus_message_get_path (message);
5411   sender = g_dbus_message_get_sender (message);
5412   is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
5413
5414   s = g_string_new (NULL);
5415   introspect_append_header (s);
5416
5417   /* Strictly we don't need the children in dynamic mode, but we avoid the
5418    * conditionals to preserve code clarity
5419    */
5420   children = es->vtable->enumerate (es->connection,
5421                                     sender,
5422                                     es->object_path,
5423                                     es->user_data);
5424
5425   if (!is_root)
5426     {
5427       requested_node = strrchr (requested_object_path, '/') + 1;
5428
5429       /* Assert existence of object if we are not dynamic */
5430       if (!(es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES) &&
5431           !_g_strv_has_string ((const gchar * const *) children, requested_node))
5432         goto out;
5433     }
5434   else
5435     {
5436       requested_node = NULL;
5437     }
5438
5439   interfaces = es->vtable->introspect (es->connection,
5440                                        sender,
5441                                        es->object_path,
5442                                        requested_node,
5443                                        es->user_data);
5444   if (interfaces != NULL)
5445     {
5446       has_properties_interface = FALSE;
5447       has_introspectable_interface = FALSE;
5448
5449       for (n = 0; interfaces[n] != NULL; n++)
5450         {
5451           if (strcmp (interfaces[n]->name, "org.freedesktop.DBus.Properties") == 0)
5452             has_properties_interface = TRUE;
5453           else if (strcmp (interfaces[n]->name, "org.freedesktop.DBus.Introspectable") == 0)
5454             has_introspectable_interface = TRUE;
5455         }
5456       if (!has_properties_interface)
5457         g_string_append (s, introspect_properties_interface);
5458       if (!has_introspectable_interface)
5459         g_string_append (s, introspect_introspectable_interface);
5460
5461       for (n = 0; interfaces[n] != NULL; n++)
5462         {
5463           g_dbus_interface_info_generate_xml (interfaces[n], 2, s);
5464           g_dbus_interface_info_unref (interfaces[n]);
5465         }
5466       g_free (interfaces);
5467     }
5468
5469   /* then include <node> entries from the Subtree for the root */
5470   if (is_root)
5471     {
5472       for (n = 0; children != NULL && children[n] != NULL; n++)
5473         g_string_append_printf (s, "  <node name=\"%s\"/>\n", children[n]);
5474     }
5475
5476   /* finally include nodes registered below us */
5477   subnode_paths = g_dbus_connection_list_registered (es->connection, requested_object_path);
5478   for (n = 0; subnode_paths != NULL && subnode_paths[n] != NULL; n++)
5479     g_string_append_printf (s, "  <node name=\"%s\"/>\n", subnode_paths[n]);
5480   g_strfreev (subnode_paths);
5481
5482   g_string_append (s, "</node>\n");
5483
5484   reply = g_dbus_message_new_method_reply (message);
5485   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
5486   g_dbus_connection_send_message (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
5487   g_object_unref (reply);
5488
5489   handled = TRUE;
5490
5491  out:
5492   g_string_free (s, TRUE);
5493   g_strfreev (children);
5494   return handled;
5495 }
5496
5497 /* called without lock held */
5498 static gboolean
5499 handle_subtree_method_invocation (GDBusConnection *connection,
5500                                   ExportedSubtree *es,
5501                                   GDBusMessage    *message)
5502 {
5503   gboolean handled;
5504   const gchar *sender;
5505   const gchar *interface_name;
5506   const gchar *member;
5507   const gchar *signature;
5508   const gchar *requested_object_path;
5509   const gchar *requested_node;
5510   gboolean is_root;
5511   GDBusInterfaceInfo *interface_info;
5512   const GDBusInterfaceVTable *interface_vtable;
5513   gpointer interface_user_data;
5514   guint n;
5515   GDBusInterfaceInfo **interfaces;
5516   gboolean is_property_get;
5517   gboolean is_property_set;
5518   gboolean is_property_get_all;
5519
5520   handled = FALSE;
5521   interfaces = NULL;
5522
5523   requested_object_path = g_dbus_message_get_path (message);
5524   sender = g_dbus_message_get_sender (message);
5525   interface_name = g_dbus_message_get_interface (message);
5526   member = g_dbus_message_get_member (message);
5527   signature = g_dbus_message_get_signature (message);
5528   is_root = (g_strcmp0 (requested_object_path, es->object_path) == 0);
5529
5530   is_property_get = FALSE;
5531   is_property_set = FALSE;
5532   is_property_get_all = FALSE;
5533   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Properties") == 0)
5534     {
5535       if (g_strcmp0 (member, "Get") == 0 && g_strcmp0 (signature, "ss") == 0)
5536         is_property_get = TRUE;
5537       else if (g_strcmp0 (member, "Set") == 0 && g_strcmp0 (signature, "ssv") == 0)
5538         is_property_set = TRUE;
5539       else if (g_strcmp0 (member, "GetAll") == 0 && g_strcmp0 (signature, "s") == 0)
5540         is_property_get_all = TRUE;
5541     }
5542
5543   if (!is_root)
5544     {
5545       requested_node = strrchr (requested_object_path, '/') + 1;
5546
5547       if (~es->flags & G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES)
5548         {
5549           /* We don't want to dispatch to unenumerated
5550            * nodes, so ensure that the child exists.
5551            */
5552           gchar **children;
5553           gboolean exists;
5554
5555           children = es->vtable->enumerate (es->connection,
5556                                             sender,
5557                                             es->object_path,
5558                                             es->user_data);
5559
5560           exists = _g_strv_has_string ((const gchar * const *) children, requested_node);
5561           g_strfreev (children);
5562
5563           if (!exists)
5564             goto out;
5565         }
5566     }
5567   else
5568     {
5569       requested_node = NULL;
5570     }
5571
5572   /* get introspection data for the node */
5573   interfaces = es->vtable->introspect (es->connection,
5574                                        sender,
5575                                        requested_object_path,
5576                                        requested_node,
5577                                        es->user_data);
5578
5579   if (interfaces == NULL)
5580     goto out;
5581
5582   interface_info = NULL;
5583   for (n = 0; interfaces[n] != NULL; n++)
5584     {
5585       if (g_strcmp0 (interfaces[n]->name, interface_name) == 0)
5586         interface_info = interfaces[n];
5587     }
5588
5589   /* dispatch the call if the user wants to handle it */
5590   if (interface_info != NULL)
5591     {
5592       /* figure out where to dispatch the method call */
5593       interface_user_data = NULL;
5594       interface_vtable = es->vtable->dispatch (es->connection,
5595                                                sender,
5596                                                es->object_path,
5597                                                interface_name,
5598                                                requested_node,
5599                                                &interface_user_data,
5600                                                es->user_data);
5601       if (interface_vtable == NULL)
5602         goto out;
5603
5604       CONNECTION_LOCK (connection);
5605       handled = validate_and_maybe_schedule_method_call (es->connection,
5606                                                          message,
5607                                                          0,
5608                                                          es->id,
5609                                                          interface_info,
5610                                                          interface_vtable,
5611                                                          es->context,
5612                                                          interface_user_data);
5613       CONNECTION_UNLOCK (connection);
5614     }
5615   /* handle org.freedesktop.DBus.Properties interface if not explicitly handled */
5616   else if (is_property_get || is_property_set || is_property_get_all)
5617     {
5618       if (is_property_get)
5619         g_variant_get (g_dbus_message_get_body (message), "(&s&s)", &interface_name, NULL);
5620       else if (is_property_set)
5621         g_variant_get (g_dbus_message_get_body (message), "(&s&sv)", &interface_name, NULL, NULL);
5622       else if (is_property_get_all)
5623         g_variant_get (g_dbus_message_get_body (message), "(&s)", &interface_name, NULL, NULL);
5624       else
5625         g_assert_not_reached ();
5626
5627       /* see if the object supports this interface at all */
5628       for (n = 0; interfaces[n] != NULL; n++)
5629         {
5630           if (g_strcmp0 (interfaces[n]->name, interface_name) == 0)
5631             interface_info = interfaces[n];
5632         }
5633
5634       /* Fail with org.freedesktop.DBus.Error.InvalidArgs if the user-code
5635        * claims it won't support the interface
5636        */
5637       if (interface_info == NULL)
5638         {
5639           GDBusMessage *reply;
5640           reply = g_dbus_message_new_method_error (message,
5641                                                    "org.freedesktop.DBus.Error.InvalidArgs",
5642                                                    _("No such interface `%s'"),
5643                                                    interface_name);
5644           g_dbus_connection_send_message (es->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
5645           g_object_unref (reply);
5646           handled = TRUE;
5647           goto out;
5648         }
5649
5650       /* figure out where to dispatch the property get/set/getall calls */
5651       interface_user_data = NULL;
5652       interface_vtable = es->vtable->dispatch (es->connection,
5653                                                sender,
5654                                                es->object_path,
5655                                                interface_name,
5656                                                requested_node,
5657                                                &interface_user_data,
5658                                                es->user_data);
5659       if (interface_vtable == NULL)
5660         {
5661           g_warning ("The subtree introspection function indicates that '%s' "
5662                      "is a valid interface name, but calling the dispatch "
5663                      "function on that interface gave us NULL", interface_name);
5664           goto out;
5665         }
5666
5667       if (is_property_get || is_property_set)
5668         {
5669           CONNECTION_LOCK (connection);
5670           handled = validate_and_maybe_schedule_property_getset (es->connection,
5671                                                                  message,
5672                                                                  0,
5673                                                                  es->id,
5674                                                                  is_property_get,
5675                                                                  interface_info,
5676                                                                  interface_vtable,
5677                                                                  es->context,
5678                                                                  interface_user_data);
5679           CONNECTION_UNLOCK (connection);
5680         }
5681       else if (is_property_get_all)
5682         {
5683           CONNECTION_LOCK (connection);
5684           handled = validate_and_maybe_schedule_property_get_all (es->connection,
5685                                                                   message,
5686                                                                   0,
5687                                                                   es->id,
5688                                                                   interface_info,
5689                                                                   interface_vtable,
5690                                                                   es->context,
5691                                                                   interface_user_data);
5692           CONNECTION_UNLOCK (connection);
5693         }
5694     }
5695
5696  out:
5697   if (interfaces != NULL)
5698     {
5699       for (n = 0; interfaces[n] != NULL; n++)
5700         g_dbus_interface_info_unref (interfaces[n]);
5701       g_free (interfaces);
5702     }
5703
5704   return handled;
5705 }
5706
5707 typedef struct
5708 {
5709   GDBusMessage *message;
5710   ExportedSubtree *es;
5711 } SubtreeDeferredData;
5712
5713 static void
5714 subtree_deferred_data_free (SubtreeDeferredData *data)
5715 {
5716   g_object_unref (data->message);
5717   g_free (data);
5718 }
5719
5720 /* called without lock held in the thread where the caller registered the subtree */
5721 static gboolean
5722 process_subtree_vtable_message_in_idle_cb (gpointer _data)
5723 {
5724   SubtreeDeferredData *data = _data;
5725   gboolean handled;
5726
5727   handled = FALSE;
5728
5729   if (g_strcmp0 (g_dbus_message_get_interface (data->message), "org.freedesktop.DBus.Introspectable") == 0 &&
5730       g_strcmp0 (g_dbus_message_get_member (data->message), "Introspect") == 0 &&
5731       g_strcmp0 (g_dbus_message_get_signature (data->message), "") == 0)
5732     handled = handle_subtree_introspect (data->es->connection,
5733                                          data->es,
5734                                          data->message);
5735   else
5736     handled = handle_subtree_method_invocation (data->es->connection,
5737                                                 data->es,
5738                                                 data->message);
5739
5740   if (!handled)
5741     {
5742       CONNECTION_LOCK (data->es->connection);
5743       handled = handle_generic_unlocked (data->es->connection, data->message);
5744       CONNECTION_UNLOCK (data->es->connection);
5745     }
5746
5747   /* if we couldn't handle the request, just bail with the UnknownMethod error */
5748   if (!handled)
5749     {
5750       GDBusMessage *reply;
5751       reply = g_dbus_message_new_method_error (data->message,
5752                                                "org.freedesktop.DBus.Error.UnknownMethod",
5753                                                _("Method `%s' on interface `%s' with signature `%s' does not exist"),
5754                                                g_dbus_message_get_member (data->message),
5755                                                g_dbus_message_get_interface (data->message),
5756                                                g_dbus_message_get_signature (data->message));
5757       g_dbus_connection_send_message (data->es->connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
5758       g_object_unref (reply);
5759     }
5760
5761   return FALSE;
5762 }
5763
5764 /* called in message handler thread with lock held */
5765 static gboolean
5766 subtree_message_func (GDBusConnection *connection,
5767                       ExportedSubtree *es,
5768                       GDBusMessage    *message)
5769 {
5770   GSource *idle_source;
5771   SubtreeDeferredData *data;
5772
5773   data = g_new0 (SubtreeDeferredData, 1);
5774   data->message = g_object_ref (message);
5775   data->es = es;
5776
5777   /* defer this call to an idle handler in the right thread */
5778   idle_source = g_idle_source_new ();
5779   g_source_set_priority (idle_source, G_PRIORITY_HIGH);
5780   g_source_set_callback (idle_source,
5781                          process_subtree_vtable_message_in_idle_cb,
5782                          data,
5783                          (GDestroyNotify) subtree_deferred_data_free);
5784   g_source_attach (idle_source, es->context);
5785   g_source_unref (idle_source);
5786
5787   /* since we own the entire subtree, handlers for objects not in the subtree have been
5788    * tried already by libdbus-1 - so we just need to ensure that we're always going
5789    * to reply to the message
5790    */
5791   return TRUE;
5792 }
5793
5794 /**
5795  * g_dbus_connection_register_subtree:
5796  * @connection: A #GDBusConnection.
5797  * @object_path: The object path to register the subtree at.
5798  * @vtable: A #GDBusSubtreeVTable to enumerate, introspect and dispatch nodes in the subtree.
5799  * @flags: Flags used to fine tune the behavior of the subtree.
5800  * @user_data: Data to pass to functions in @vtable.
5801  * @user_data_free_func: Function to call when the subtree is unregistered.
5802  * @error: Return location for error or %NULL.
5803  *
5804  * Registers a whole subtree of <quote>dynamic</quote> objects.
5805  *
5806  * The @enumerate and @introspection functions in @vtable are used to
5807  * convey, to remote callers, what nodes exist in the subtree rooted
5808  * by @object_path.
5809  *
5810  * When handling remote calls into any node in the subtree, first the
5811  * @enumerate function is used to check if the node exists. If the node exists
5812  * or the #G_DBUS_SUBTREE_FLAGS_DISPATCH_TO_UNENUMERATED_NODES flag is set
5813  * the @introspection function is used to check if the node supports the
5814  * requested method. If so, the @dispatch function is used to determine
5815  * where to dispatch the call. The collected #GDBusInterfaceVTable and
5816  * #gpointer will be used to call into the interface vtable for processing
5817  * the request.
5818  *
5819  * All calls into user-provided code will be invoked in the <link
5820  * linkend="g-main-context-push-thread-default">thread-default main
5821  * loop</link> of the thread you are calling this method from.
5822  *
5823  * If an existing subtree is already registered at @object_path or
5824  * then @error is set to #G_IO_ERROR_EXISTS.
5825  *
5826  * Note that it is valid to register regular objects (using
5827  * g_dbus_connection_register_object()) in a subtree registered with
5828  * g_dbus_connection_register_subtree() - if so, the subtree handler
5829  * is tried as the last resort. One way to think about a subtree
5830  * handler is to consider it a <quote>fallback handler</quote>
5831  * for object paths not registered via g_dbus_connection_register_object()
5832  * or other bindings.
5833  *
5834  * Note that @vtable will be copied so you cannot change it after
5835  * registration.
5836  *
5837  * See <xref linkend="gdbus-subtree-server"/> for an example of how to use this method.
5838  *
5839  * Returns: 0 if @error is set, otherwise a subtree registration id (never 0)
5840  * that can be used with g_dbus_connection_unregister_subtree() .
5841  *
5842  * Since: 2.26
5843  */
5844 guint
5845 g_dbus_connection_register_subtree (GDBusConnection           *connection,
5846                                     const gchar               *object_path,
5847                                     const GDBusSubtreeVTable  *vtable,
5848                                     GDBusSubtreeFlags          flags,
5849                                     gpointer                   user_data,
5850                                     GDestroyNotify             user_data_free_func,
5851                                     GError                   **error)
5852 {
5853   guint ret;
5854   ExportedSubtree *es;
5855
5856   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
5857   g_return_val_if_fail (object_path != NULL && g_variant_is_object_path (object_path), 0);
5858   g_return_val_if_fail (vtable != NULL, 0);
5859   g_return_val_if_fail (error == NULL || *error == NULL, 0);
5860
5861   ret = 0;
5862
5863   CONNECTION_LOCK (connection);
5864
5865   es = g_hash_table_lookup (connection->map_object_path_to_es, object_path);
5866   if (es != NULL)
5867     {
5868       g_set_error (error,
5869                    G_IO_ERROR,
5870                    G_IO_ERROR_EXISTS,
5871                    _("A subtree is already exported for %s"),
5872                    object_path);
5873       goto out;
5874     }
5875
5876   es = g_new0 (ExportedSubtree, 1);
5877   es->object_path = g_strdup (object_path);
5878   es->connection = connection;
5879
5880   es->vtable = _g_dbus_subtree_vtable_copy (vtable);
5881   es->flags = flags;
5882   es->id = _global_subtree_registration_id++; /* TODO: overflow etc. */
5883   es->user_data = user_data;
5884   es->user_data_free_func = user_data_free_func;
5885   es->context = g_main_context_get_thread_default ();
5886   if (es->context != NULL)
5887     g_main_context_ref (es->context);
5888
5889   g_hash_table_insert (connection->map_object_path_to_es, es->object_path, es);
5890   g_hash_table_insert (connection->map_id_to_es,
5891                        GUINT_TO_POINTER (es->id),
5892                        es);
5893
5894   ret = es->id;
5895
5896  out:
5897   CONNECTION_UNLOCK (connection);
5898
5899   return ret;
5900 }
5901
5902 /* ---------------------------------------------------------------------------------------------------- */
5903
5904 /**
5905  * g_dbus_connection_unregister_subtree:
5906  * @connection: A #GDBusConnection.
5907  * @registration_id: A subtree registration id obtained from g_dbus_connection_register_subtree().
5908  *
5909  * Unregisters a subtree.
5910  *
5911  * Returns: %TRUE if the subtree was unregistered, %FALSE otherwise.
5912  *
5913  * Since: 2.26
5914  */
5915 gboolean
5916 g_dbus_connection_unregister_subtree (GDBusConnection *connection,
5917                                       guint            registration_id)
5918 {
5919   ExportedSubtree *es;
5920   gboolean ret;
5921
5922   g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
5923
5924   ret = FALSE;
5925
5926   CONNECTION_LOCK (connection);
5927
5928   es = g_hash_table_lookup (connection->map_id_to_es,
5929                             GUINT_TO_POINTER (registration_id));
5930   if (es == NULL)
5931     goto out;
5932
5933   g_warn_if_fail (g_hash_table_remove (connection->map_id_to_es, GUINT_TO_POINTER (es->id)));
5934   g_warn_if_fail (g_hash_table_remove (connection->map_object_path_to_es, es->object_path));
5935
5936   ret = TRUE;
5937
5938  out:
5939   CONNECTION_UNLOCK (connection);
5940
5941   return ret;
5942 }
5943
5944 /* ---------------------------------------------------------------------------------------------------- */
5945
5946 /* must be called with lock held */
5947 static void
5948 handle_generic_ping_unlocked (GDBusConnection *connection,
5949                               const gchar     *object_path,
5950                               GDBusMessage    *message)
5951 {
5952   GDBusMessage *reply;
5953   reply = g_dbus_message_new_method_reply (message);
5954   g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
5955   g_object_unref (reply);
5956 }
5957
5958 /* must be called with lock held */
5959 static void
5960 handle_generic_get_machine_id_unlocked (GDBusConnection *connection,
5961                                         const gchar     *object_path,
5962                                         GDBusMessage    *message)
5963 {
5964   GDBusMessage *reply;
5965
5966   reply = NULL;
5967   if (connection->machine_id == NULL)
5968     {
5969       GError *error;
5970
5971       error = NULL;
5972       connection->machine_id = _g_dbus_get_machine_id (&error);
5973       if (connection->machine_id == NULL)
5974         {
5975           reply = g_dbus_message_new_method_error_literal (message,
5976                                                            "org.freedesktop.DBus.Error.Failed",
5977                                                            error->message);
5978           g_error_free (error);
5979         }
5980     }
5981
5982   if (reply == NULL)
5983     {
5984       reply = g_dbus_message_new_method_reply (message);
5985       g_dbus_message_set_body (reply, g_variant_new ("(s)", connection->machine_id));
5986     }
5987   g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
5988   g_object_unref (reply);
5989 }
5990
5991 /* must be called with lock held */
5992 static void
5993 handle_generic_introspect_unlocked (GDBusConnection *connection,
5994                                     const gchar     *object_path,
5995                                     GDBusMessage    *message)
5996 {
5997   guint n;
5998   GString *s;
5999   gchar **registered;
6000   GDBusMessage *reply;
6001
6002   /* first the header */
6003   s = g_string_new (NULL);
6004   introspect_append_header (s);
6005
6006   registered = g_dbus_connection_list_registered_unlocked (connection, object_path);
6007   for (n = 0; registered != NULL && registered[n] != NULL; n++)
6008       g_string_append_printf (s, "  <node name=\"%s\"/>\n", registered[n]);
6009   g_strfreev (registered);
6010   g_string_append (s, "</node>\n");
6011
6012   reply = g_dbus_message_new_method_reply (message);
6013   g_dbus_message_set_body (reply, g_variant_new ("(s)", s->str));
6014   g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
6015   g_object_unref (reply);
6016   g_string_free (s, TRUE);
6017 }
6018
6019 /* must be called with lock held */
6020 static gboolean
6021 handle_generic_unlocked (GDBusConnection *connection,
6022                          GDBusMessage    *message)
6023 {
6024   gboolean handled;
6025   const gchar *interface_name;
6026   const gchar *member;
6027   const gchar *signature;
6028   const gchar *path;
6029
6030   CONNECTION_ENSURE_LOCK (connection);
6031
6032   handled = FALSE;
6033
6034   interface_name = g_dbus_message_get_interface (message);
6035   member = g_dbus_message_get_member (message);
6036   signature = g_dbus_message_get_signature (message);
6037   path = g_dbus_message_get_path (message);
6038
6039   if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Introspectable") == 0 &&
6040       g_strcmp0 (member, "Introspect") == 0 &&
6041       g_strcmp0 (signature, "") == 0)
6042     {
6043       handle_generic_introspect_unlocked (connection, path, message);
6044       handled = TRUE;
6045     }
6046   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
6047            g_strcmp0 (member, "Ping") == 0 &&
6048            g_strcmp0 (signature, "") == 0)
6049     {
6050       handle_generic_ping_unlocked (connection, path, message);
6051       handled = TRUE;
6052     }
6053   else if (g_strcmp0 (interface_name, "org.freedesktop.DBus.Peer") == 0 &&
6054            g_strcmp0 (member, "GetMachineId") == 0 &&
6055            g_strcmp0 (signature, "") == 0)
6056     {
6057       handle_generic_get_machine_id_unlocked (connection, path, message);
6058       handled = TRUE;
6059     }
6060
6061   return handled;
6062 }
6063
6064 /* ---------------------------------------------------------------------------------------------------- */
6065
6066 /* called in message handler thread with lock held */
6067 static void
6068 distribute_method_call (GDBusConnection *connection,
6069                         GDBusMessage    *message)
6070 {
6071   GDBusMessage *reply;
6072   ExportedObject *eo;
6073   ExportedSubtree *es;
6074   const gchar *object_path;
6075   const gchar *interface_name;
6076   const gchar *member;
6077   const gchar *path;
6078   gchar *subtree_path;
6079   gchar *needle;
6080
6081   g_assert (g_dbus_message_get_message_type (message) == G_DBUS_MESSAGE_TYPE_METHOD_CALL);
6082
6083   interface_name = g_dbus_message_get_interface (message);
6084   member = g_dbus_message_get_member (message);
6085   path = g_dbus_message_get_path (message);
6086   subtree_path = g_strdup (path);
6087   needle = strrchr (subtree_path, '/');
6088   if (needle != NULL && needle != subtree_path)
6089     {
6090       *needle = '\0';
6091     }
6092   else
6093     {
6094       g_free (subtree_path);
6095       subtree_path = NULL;
6096     }
6097
6098
6099   if (G_UNLIKELY (_g_dbus_debug_incoming ()))
6100     {
6101       _g_dbus_debug_print_lock ();
6102       g_print ("========================================================================\n"
6103                "GDBus-debug:Incoming:\n"
6104                " <<<< METHOD INVOCATION %s.%s()\n"
6105                "      on object %s\n"
6106                "      invoked by name %s\n"
6107                "      serial %d\n",
6108                interface_name, member,
6109                path,
6110                g_dbus_message_get_sender (message) != NULL ? g_dbus_message_get_sender (message) : "(none)",
6111                g_dbus_message_get_serial (message));
6112       _g_dbus_debug_print_unlock ();
6113     }
6114
6115   object_path = g_dbus_message_get_path (message);
6116   g_assert (object_path != NULL);
6117
6118   eo = g_hash_table_lookup (connection->map_object_path_to_eo, object_path);
6119   if (eo != NULL)
6120     {
6121       if (obj_message_func (connection, eo, message))
6122         goto out;
6123     }
6124
6125   es = g_hash_table_lookup (connection->map_object_path_to_es, object_path);
6126   if (es != NULL)
6127     {
6128       if (subtree_message_func (connection, es, message))
6129         goto out;
6130     }
6131
6132   if (subtree_path != NULL)
6133     {
6134       es = g_hash_table_lookup (connection->map_object_path_to_es, subtree_path);
6135       if (es != NULL)
6136         {
6137           if (subtree_message_func (connection, es, message))
6138             goto out;
6139         }
6140     }
6141
6142   if (handle_generic_unlocked (connection, message))
6143     goto out;
6144
6145   /* if we end up here, the message has not been not handled - so return an error saying this */
6146   reply = g_dbus_message_new_method_error (message,
6147                                            "org.freedesktop.DBus.Error.UnknownMethod",
6148                                            _("No such interface `%s' on object at path %s"),
6149                                            interface_name,
6150                                            object_path);
6151   g_dbus_connection_send_message_unlocked (connection, reply, G_DBUS_SEND_MESSAGE_FLAGS_NONE, NULL, NULL);
6152   g_object_unref (reply);
6153
6154  out:
6155   g_free (subtree_path);
6156 }
6157
6158 /* ---------------------------------------------------------------------------------------------------- */
6159
6160 static GDBusConnection **
6161 message_bus_get_singleton (GBusType   bus_type,
6162                            GError   **error)
6163 {
6164   GDBusConnection **ret;
6165   const gchar *starter_bus;
6166
6167   ret = NULL;
6168
6169   switch (bus_type)
6170     {
6171     case G_BUS_TYPE_SESSION:
6172       ret = &the_session_bus;
6173       break;
6174
6175     case G_BUS_TYPE_SYSTEM:
6176       ret = &the_system_bus;
6177       break;
6178
6179     case G_BUS_TYPE_STARTER:
6180       starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
6181       if (g_strcmp0 (starter_bus, "session") == 0)
6182         {
6183           ret = message_bus_get_singleton (G_BUS_TYPE_SESSION, error);
6184           goto out;
6185         }
6186       else if (g_strcmp0 (starter_bus, "system") == 0)
6187         {
6188           ret = message_bus_get_singleton (G_BUS_TYPE_SYSTEM, error);
6189           goto out;
6190         }
6191       else
6192         {
6193           if (starter_bus != NULL)
6194             {
6195               g_set_error (error,
6196                            G_IO_ERROR,
6197                            G_IO_ERROR_INVALID_ARGUMENT,
6198                            _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
6199                              " - unknown value `%s'"),
6200                            starter_bus);
6201             }
6202           else
6203             {
6204               g_set_error_literal (error,
6205                                    G_IO_ERROR,
6206                                    G_IO_ERROR_INVALID_ARGUMENT,
6207                                    _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
6208                                      "variable is not set"));
6209             }
6210         }
6211       break;
6212
6213     default:
6214       g_assert_not_reached ();
6215       break;
6216     }
6217
6218  out:
6219   return ret;
6220 }
6221
6222 static GDBusConnection *
6223 get_uninitialized_connection (GBusType       bus_type,
6224                               GCancellable  *cancellable,
6225                               GError       **error)
6226 {
6227   GDBusConnection **singleton;
6228   GDBusConnection *ret;
6229
6230   ret = NULL;
6231
6232   G_LOCK (message_bus_lock);
6233   singleton = message_bus_get_singleton (bus_type, error);
6234   if (singleton == NULL)
6235     goto out;
6236
6237   if (*singleton == NULL)
6238     {
6239       gchar *address;
6240       address = g_dbus_address_get_for_bus_sync (bus_type, cancellable, error);
6241       if (address == NULL)
6242         goto out;
6243       ret = *singleton = g_object_new (G_TYPE_DBUS_CONNECTION,
6244                                        "address", address,
6245                                        "flags", G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT |
6246                                                 G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION,
6247                                        "exit-on-close", TRUE,
6248                                        NULL);
6249       g_free (address);
6250     }
6251   else
6252     {
6253       ret = g_object_ref (*singleton);
6254     }
6255
6256   g_assert (ret != NULL);
6257
6258  out:
6259   G_UNLOCK (message_bus_lock);
6260   return ret;
6261 }
6262
6263 /**
6264  * g_bus_get_sync:
6265  * @bus_type: A #GBusType.
6266  * @cancellable: A #GCancellable or %NULL.
6267  * @error: Return location for error or %NULL.
6268  *
6269  * Synchronously connects to the message bus specified by @bus_type.
6270  * Note that the returned object may shared with other callers,
6271  * e.g. if two separate parts of a process calls this function with
6272  * the same @bus_type, they will share the same object.
6273  *
6274  * This is a synchronous failable function. See g_bus_get() and
6275  * g_bus_get_finish() for the asynchronous version.
6276  *
6277  * The returned object is a singleton, that is, shared with other
6278  * callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
6279  * event that you need a private message bus connection, use
6280  * g_dbus_address_get_for_bus_sync() and
6281  * g_dbus_connection_new_for_address().
6282  *
6283  * Note that the returned #GDBusConnection object will (usually) have
6284  * the #GDBusConnection:exit-on-close property set to %TRUE.
6285  *
6286  * Returns: (transfer full): A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
6287  *
6288  * Since: 2.26
6289  */
6290 GDBusConnection *
6291 g_bus_get_sync (GBusType       bus_type,
6292                 GCancellable  *cancellable,
6293                 GError       **error)
6294 {
6295   GDBusConnection *connection;
6296
6297   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
6298
6299   connection = get_uninitialized_connection (bus_type, cancellable, error);
6300   if (connection == NULL)
6301     goto out;
6302
6303   if (!g_initable_init (G_INITABLE (connection), cancellable, error))
6304     {
6305       g_object_unref (connection);
6306       connection = NULL;
6307     }
6308
6309  out:
6310   return connection;
6311 }
6312
6313 static void
6314 bus_get_async_initable_cb (GObject      *source_object,
6315                            GAsyncResult *res,
6316                            gpointer      user_data)
6317 {
6318   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (user_data);
6319   GError *error;
6320
6321   error = NULL;
6322   if (!g_async_initable_init_finish (G_ASYNC_INITABLE (source_object),
6323                                      res,
6324                                      &error))
6325     {
6326       g_assert (error != NULL);
6327       g_simple_async_result_take_error (simple, error);
6328       g_object_unref (source_object);
6329     }
6330   else
6331     {
6332       g_simple_async_result_set_op_res_gpointer (simple,
6333                                                  source_object,
6334                                                  g_object_unref);
6335     }
6336   g_simple_async_result_complete_in_idle (simple);
6337   g_object_unref (simple);
6338 }
6339
6340 /**
6341  * g_bus_get:
6342  * @bus_type: A #GBusType.
6343  * @cancellable: A #GCancellable or %NULL.
6344  * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
6345  * @user_data: The data to pass to @callback.
6346  *
6347  * Asynchronously connects to the message bus specified by @bus_type.
6348  *
6349  * When the operation is finished, @callback will be invoked. You can
6350  * then call g_bus_get_finish() to get the result of the operation.
6351  *
6352  * This is a asynchronous failable function. See g_bus_get_sync() for
6353  * the synchronous version.
6354  *
6355  * Since: 2.26
6356  */
6357 void
6358 g_bus_get (GBusType             bus_type,
6359            GCancellable        *cancellable,
6360            GAsyncReadyCallback  callback,
6361            gpointer             user_data)
6362 {
6363   GDBusConnection *connection;
6364   GSimpleAsyncResult *simple;
6365   GError *error;
6366
6367   simple = g_simple_async_result_new (NULL,
6368                                       callback,
6369                                       user_data,
6370                                       g_bus_get);
6371
6372   error = NULL;
6373   connection = get_uninitialized_connection (bus_type, cancellable, &error);
6374   if (connection == NULL)
6375     {
6376       g_assert (error != NULL);
6377       g_simple_async_result_take_error (simple, error);
6378       g_simple_async_result_complete_in_idle (simple);
6379       g_object_unref (simple);
6380     }
6381   else
6382     {
6383       g_async_initable_init_async (G_ASYNC_INITABLE (connection),
6384                                    G_PRIORITY_DEFAULT,
6385                                    cancellable,
6386                                    bus_get_async_initable_cb,
6387                                    simple);
6388     }
6389 }
6390
6391 /**
6392  * g_bus_get_finish:
6393  * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_bus_get().
6394  * @error: Return location for error or %NULL.
6395  *
6396  * Finishes an operation started with g_bus_get().
6397  *
6398  * The returned object is a singleton, that is, shared with other
6399  * callers of g_bus_get() and g_bus_get_sync() for @bus_type. In the
6400  * event that you need a private message bus connection, use
6401  * g_dbus_address_get_for_bus_sync() and
6402  * g_dbus_connection_new_for_address().
6403  *
6404  * Note that the returned #GDBusConnection object will (usually) have
6405  * the #GDBusConnection:exit-on-close property set to %TRUE.
6406  *
6407  * Returns: (transfer full): A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
6408  *
6409  * Since: 2.26
6410  */
6411 GDBusConnection *
6412 g_bus_get_finish (GAsyncResult  *res,
6413                   GError       **error)
6414 {
6415   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
6416   GObject *object;
6417   GDBusConnection *ret;
6418
6419   g_return_val_if_fail (error == NULL || *error == NULL, NULL);
6420
6421   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_bus_get);
6422
6423   ret = NULL;
6424
6425   if (g_simple_async_result_propagate_error (simple, error))
6426     goto out;
6427
6428   object = g_simple_async_result_get_op_res_gpointer (simple);
6429   g_assert (object != NULL);
6430   ret = g_object_ref (G_DBUS_CONNECTION (object));
6431
6432  out:
6433   return ret;
6434 }
6435
6436 /* ---------------------------------------------------------------------------------------------------- */