gdbusconnection.c 187 KB
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/* GDBus - GLib D-Bus Library
 *
 * Copyright (C) 2008-2009 Red Hat, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Author: David Zeuthen <davidz@redhat.com>
 */

/*
 * TODO for GDBus:
 *
 * - would be nice to expose GDBusAuthMechanism and an extension point
 *
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 * - Need to rewrite GDBusAuth and rework GDBusAuthMechanism. In particular
 *   the mechanism VFuncs need to be able to set an error.
 *
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 * - probably want a G_DBUS_NONCE_TCP_TMPDIR environment variable
 *   to specify where the nonce is stored. This will allow people to use
 *   G_DBUS_NONCE_TCP_TMPDIR=/mnt/secure.company.server/dbus-nonce-dir
 *   to easily acheive secure RPC via nonce-tcp.
 *
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 * - need to expose an extension point for resolving D-Bus address and
 *   turning them into GIOStream objects. This will allow us to implement
 *   e.g. X11 D-Bus transports without dlopen()'ing or linking against
 *   libX11 from libgio.
 *   - see g_dbus_address_connect() in gdbusaddress.c
 *
 * - would be cute to use kernel-specific APIs to resolve fds for
 *   debug output when using G_DBUS_DEBUG=messages, e.g. in addition to
 *
 *     fd 21: dev=8:1,mode=0100644,ino=1171231,uid=0,gid=0,rdev=0:0,size=234,atime=1273070640,mtime=1267126160,ctime=1267126160
 *
 *   maybe we can show more information about what fd 21 really is.
 *   Ryan suggests looking in /proc/self/fd for clues / symlinks!
 *   Initial experiments on Linux 2.6 suggests that the symlink looks
 *   like this:
 *
 *    3 -> /proc/18068/fd
 *
 *   e.g. not of much use.
 */

#include "config.h"

#include <stdlib.h>
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#include <string.h>
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#include "gdbusauth.h"
#include "gdbusutils.h"
#include "gdbusaddress.h"
#include "gdbusmessage.h"
#include "gdbusconnection.h"
#include "gdbuserror.h"
#include "gioenumtypes.h"
#include "gdbusintrospection.h"
#include "gdbusmethodinvocation.h"
#include "gdbusprivate.h"
#include "gdbusauthobserver.h"
#include "gio-marshal.h"
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#include "ginitable.h"
#include "gasyncinitable.h"
#include "giostream.h"
#include "gasyncresult.h"
#include "gsimpleasyncresult.h"

#ifdef G_OS_UNIX
#include <gio/gunixconnection.h>
#include <gio/gunixfdmessage.h>
#include <unistd.h>
#include <sys/types.h>
#endif

#include "glibintl.h"
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#include "gioalias.h"
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/**
 * SECTION:gdbusconnection
 * @short_description: D-Bus Connections
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 * @include: gio/gio.h
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 *
 * <para><note>
 * This class is rarely used directly in D-Bus clients. If you are
 * writing an D-Bus client, it is often easier to use the
 * g_bus_own_name(), g_bus_watch_name() or g_bus_watch_proxy() APIs.
 * </note></para>
 *
 * The #GDBusConnection type is used for D-Bus connections to remote
 * peers such as a message buses.
 *
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 * <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>
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 *
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 * <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>
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 *
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 * <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>
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 */

/* ---------------------------------------------------------------------------------------------------- */

G_LOCK_DEFINE_STATIC (message_bus_lock);

static GDBusConnection *the_session_bus = NULL;
static GDBusConnection *the_system_bus = NULL;

/* ---------------------------------------------------------------------------------------------------- */

static gboolean
_g_strv_has_string (const gchar* const * haystack,
                    const gchar *needle)
{
  guint n;

  for (n = 0; haystack != NULL && haystack[n] != NULL; n++)
    {
      if (g_strcmp0 (haystack[n], needle) == 0)
        return TRUE;
    }
  return FALSE;
}

/* ---------------------------------------------------------------------------------------------------- */

#ifdef G_OS_WIN32
#define CONNECTION_ENSURE_LOCK(obj) do { ; } while (FALSE)
#else
// TODO: for some reason this doesn't work on Windows
#define CONNECTION_ENSURE_LOCK(obj) do {                                \
    if (G_UNLIKELY (g_mutex_trylock((obj)->priv->lock)))                \
      {                                                                 \
        g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
                             "CONNECTION_ENSURE_LOCK: GDBusConnection object lock is not locked"); \
      }                                                                 \
  } while (FALSE)
#endif

#define CONNECTION_LOCK(obj) do {                                       \
    g_mutex_lock ((obj)->priv->lock);                                   \
  } while (FALSE)

#define CONNECTION_UNLOCK(obj) do {                                     \
    g_mutex_unlock ((obj)->priv->lock);                                 \
  } while (FALSE)

struct _GDBusConnectionPrivate
{
  /* ------------------------------------------------------------------------ */
  /* -- General object state ------------------------------------------------ */
  /* ------------------------------------------------------------------------ */

  /* object-wide lock */
  GMutex *lock;

  /* A lock used in the init() method of the GInitable interface - see comments
   * in initable_init() for why a separate lock is needed
   */
  GMutex *init_lock;

  /* Set (by loading the contents of /var/lib/dbus/machine-id) the first time
   * someone calls org.freedesktop.DBus.GetMachineId()
   */
  gchar *machine_id;

  /* The underlying stream used for communication */
  GIOStream *stream;

  /* The object used for authentication (if any) */
  GDBusAuth *auth;

  /* Set to TRUE if the connection has been closed */
  gboolean closed;

  /* Last serial used */
  guint32 last_serial;

  /* The object used to send/receive message */
  GDBusWorker *worker;

  /* If connected to a message bus, this contains the unique name assigned to
   * us by the bus (e.g. ":1.42")
   */
  gchar *bus_unique_name;

  /* The GUID returned by the other side if we authenticed as a client or
   * the GUID to use if authenticating as a server
   */
  gchar *guid;

  /* set to TRUE exactly when initable_init() has finished running */
  gboolean is_initialized;

  /* If the connection could not be established during initable_init(), this GError will set */
  GError *initialization_error;

  /* The result of g_main_context_get_thread_default() when the object
   * was created (the GObject _init() function) - this is used for delivery
   * of the :closed GObject signal.
   */
  GMainContext *main_context_at_construction;

  /* construct properties */
  gchar *address;
  GDBusConnectionFlags flags;

  /* Map used for managing method replies */
  GHashTable *map_method_serial_to_send_message_data;  /* guint32 -> SendMessageData* */

  /* Maps used for managing signal subscription */
  GHashTable *map_rule_to_signal_data;          /* gchar* -> SignalData */
  GHashTable *map_id_to_signal_data;            /* guint  -> SignalData */
  GHashTable *map_sender_to_signal_data_array;  /* gchar* -> GPtrArray* of SignalData */

  /* Maps used for managing exported objects and subtrees */
  GHashTable *map_object_path_to_eo;  /* gchar* -> ExportedObject* */
  GHashTable *map_id_to_ei;           /* guint  -> ExportedInterface* */
  GHashTable *map_object_path_to_es;  /* gchar* -> ExportedSubtree* */
  GHashTable *map_id_to_es;           /* guint  -> ExportedSubtree* */

  /* Structure used for message filters */
  GPtrArray *filters;

  /* Whether to exit on close */
  gboolean exit_on_close;

  /* Capabilities negotiated during authentication */
  GDBusCapabilityFlags capabilities;

  GDBusAuthObserver *authentication_observer;
  GCredentials *crendentials;
};

typedef struct ExportedObject ExportedObject;
static void exported_object_free (ExportedObject *eo);

typedef struct ExportedSubtree ExportedSubtree;
static void exported_subtree_free (ExportedSubtree *es);

enum
{
  CLOSED_SIGNAL,
  LAST_SIGNAL,
};

enum
{
  PROP_0,
  PROP_STREAM,
  PROP_ADDRESS,
  PROP_FLAGS,
  PROP_GUID,
  PROP_UNIQUE_NAME,
  PROP_CLOSED,
  PROP_EXIT_ON_CLOSE,
  PROP_CAPABILITY_FLAGS,
  PROP_AUTHENTICATION_OBSERVER,
};

static void distribute_signals (GDBusConnection  *connection,
                                GDBusMessage     *message);

static void distribute_method_call (GDBusConnection  *connection,
                                    GDBusMessage     *message);

static gboolean handle_generic_unlocked (GDBusConnection *connection,
                                         GDBusMessage    *message);


static void purge_all_signal_subscriptions (GDBusConnection *connection);
static void purge_all_filters (GDBusConnection *connection);

#define _G_ENSURE_LOCK(name) do {                                       \
    if (G_UNLIKELY (G_TRYLOCK(name)))                                   \
      {                                                                 \
        g_assertion_message (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, \
                             "_G_ENSURE_LOCK: Lock `" #name "' is not locked"); \
      }                                                                 \
  } while (FALSE)                                                       \

static guint signals[LAST_SIGNAL] = { 0 };

static void initable_iface_init       (GInitableIface *initable_iface);
static void async_initable_iface_init (GAsyncInitableIface *async_initable_iface);

G_DEFINE_TYPE_WITH_CODE (GDBusConnection, g_dbus_connection, G_TYPE_OBJECT,
                         G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, initable_iface_init)
                         G_IMPLEMENT_INTERFACE (G_TYPE_ASYNC_INITABLE, async_initable_iface_init)
                         );

static void
g_dbus_connection_dispose (GObject *object)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (object);

  G_LOCK (message_bus_lock);
  //g_debug ("disposing %p", connection);
  if (connection == the_session_bus)
    {
      the_session_bus = NULL;
    }
  else if (connection == the_system_bus)
    {
      the_system_bus = NULL;
    }
  if (connection->priv->worker != NULL)
    {
      _g_dbus_worker_stop (connection->priv->worker);
      connection->priv->worker = NULL;
    }
  G_UNLOCK (message_bus_lock);

  if (G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose != NULL)
    G_OBJECT_CLASS (g_dbus_connection_parent_class)->dispose (object);
}

static void
g_dbus_connection_finalize (GObject *object)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (object);

  if (connection->priv->authentication_observer != NULL)
    g_object_unref (connection->priv->authentication_observer);

  if (connection->priv->auth != NULL)
    g_object_unref (connection->priv->auth);

  //g_debug ("finalizing %p", connection);
  if (connection->priv->stream != NULL)
    {
      /* We don't really care if closing the stream succeeds or not */
      g_io_stream_close_async (connection->priv->stream,
                               G_PRIORITY_DEFAULT,
                               NULL,  /* GCancellable */
                               NULL,  /* GAsyncReadyCallback */
                               NULL); /* userdata */
      g_object_unref (connection->priv->stream);
      connection->priv->stream = NULL;
    }

  g_free (connection->priv->address);

  g_free (connection->priv->guid);
  g_free (connection->priv->bus_unique_name);

  if (connection->priv->initialization_error != NULL)
    g_error_free (connection->priv->initialization_error);

  g_hash_table_unref (connection->priv->map_method_serial_to_send_message_data);

  purge_all_signal_subscriptions (connection);
  g_hash_table_unref (connection->priv->map_rule_to_signal_data);
  g_hash_table_unref (connection->priv->map_id_to_signal_data);
  g_hash_table_unref (connection->priv->map_sender_to_signal_data_array);

  g_hash_table_unref (connection->priv->map_id_to_ei);
  g_hash_table_unref (connection->priv->map_object_path_to_eo);
  g_hash_table_unref (connection->priv->map_id_to_es);
  g_hash_table_unref (connection->priv->map_object_path_to_es);

  purge_all_filters (connection);
  g_ptr_array_unref (connection->priv->filters);

  if (connection->priv->main_context_at_construction != NULL)
    g_main_context_unref (connection->priv->main_context_at_construction);

  g_free (connection->priv->machine_id);

  g_mutex_free (connection->priv->init_lock);
  g_mutex_free (connection->priv->lock);

  if (G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize != NULL)
    G_OBJECT_CLASS (g_dbus_connection_parent_class)->finalize (object);
}

static void
g_dbus_connection_get_property (GObject    *object,
                                guint       prop_id,
                                GValue     *value,
                                GParamSpec *pspec)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (object);

  switch (prop_id)
    {
    case PROP_STREAM:
      g_value_set_object (value, g_dbus_connection_get_stream (connection));
      break;

    case PROP_GUID:
      g_value_set_string (value, g_dbus_connection_get_guid (connection));
      break;

    case PROP_UNIQUE_NAME:
      g_value_set_string (value, g_dbus_connection_get_unique_name (connection));
      break;

    case PROP_CLOSED:
      g_value_set_boolean (value, g_dbus_connection_is_closed (connection));
      break;

    case PROP_EXIT_ON_CLOSE:
      g_value_set_boolean (value, g_dbus_connection_get_exit_on_close (connection));
      break;

    case PROP_CAPABILITY_FLAGS:
      g_value_set_flags (value, g_dbus_connection_get_capabilities (connection));
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
g_dbus_connection_set_property (GObject      *object,
                                guint         prop_id,
                                const GValue *value,
                                GParamSpec   *pspec)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (object);

  switch (prop_id)
    {
    case PROP_STREAM:
      connection->priv->stream = g_value_dup_object (value);
      break;

    case PROP_GUID:
      connection->priv->guid = g_value_dup_string (value);
      break;

    case PROP_ADDRESS:
      connection->priv->address = g_value_dup_string (value);
      break;

    case PROP_FLAGS:
      connection->priv->flags = g_value_get_flags (value);
      break;

    case PROP_EXIT_ON_CLOSE:
      g_dbus_connection_set_exit_on_close (connection, g_value_get_boolean (value));
      break;

    case PROP_AUTHENTICATION_OBSERVER:
      connection->priv->authentication_observer = g_value_dup_object (value);
      break;

    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
      break;
    }
}

static void
g_dbus_connection_real_closed (GDBusConnection *connection,
                               gboolean         remote_peer_vanished,
                               GError          *error)
{
  if (remote_peer_vanished && connection->priv->exit_on_close)
    {
      g_print ("%s: Remote peer vanished. Exiting.\n", G_STRFUNC);
      raise (SIGTERM);
    }
}

static void
g_dbus_connection_class_init (GDBusConnectionClass *klass)
{
  GObjectClass *gobject_class;

  g_type_class_add_private (klass, sizeof (GDBusConnectionPrivate));

  gobject_class = G_OBJECT_CLASS (klass);

  gobject_class->finalize     = g_dbus_connection_finalize;
  gobject_class->dispose      = g_dbus_connection_dispose;
  gobject_class->set_property = g_dbus_connection_set_property;
  gobject_class->get_property = g_dbus_connection_get_property;

  klass->closed = g_dbus_connection_real_closed;

  /**
   * GDBusConnection:stream:
   *
   * The underlying #GIOStream used for I/O.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_STREAM,
                                   g_param_spec_object ("stream",
                                                        _("IO Stream"),
                                                        _("The underlying streams used for I/O"),
                                                        G_TYPE_IO_STREAM,
                                                        G_PARAM_READABLE |
                                                        G_PARAM_WRITABLE |
                                                        G_PARAM_CONSTRUCT_ONLY |
                                                        G_PARAM_STATIC_NAME |
                                                        G_PARAM_STATIC_BLURB |
                                                        G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:address:
   *
   * A D-Bus address specifying potential endpoints that can be used
   * when establishing the connection.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_ADDRESS,
                                   g_param_spec_string ("address",
                                                        _("Address"),
                                                        _("D-Bus address specifying potential socket endpoints"),
                                                        NULL,
                                                        G_PARAM_WRITABLE |
                                                        G_PARAM_CONSTRUCT_ONLY |
                                                        G_PARAM_STATIC_NAME |
                                                        G_PARAM_STATIC_BLURB |
                                                        G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:flags:
   *
   * Flags from the #GDBusConnectionFlags enumeration.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_FLAGS,
                                   g_param_spec_flags ("flags",
                                                       _("Flags"),
                                                       _("Flags"),
                                                       G_TYPE_DBUS_CONNECTION_FLAGS,
                                                       G_DBUS_CONNECTION_FLAGS_NONE,
                                                       G_PARAM_WRITABLE |
                                                       G_PARAM_CONSTRUCT_ONLY |
                                                       G_PARAM_STATIC_NAME |
                                                       G_PARAM_STATIC_BLURB |
                                                       G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:guid:
   *
   * The GUID of the peer performing the role of server when
   * authenticating.
   *
   * If you are constructing a #GDBusConnection and pass
   * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER in the
   * #GDBusConnection:flags property then you MUST also set this
   * property to a valid guid.
   *
   * If you are constructing a #GDBusConnection and pass
   * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT in the
   * #GDBusConnection:flags property you will be able to read the GUID
   * of the other peer here after the connection has been succesfully
   * initialized.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_GUID,
                                   g_param_spec_string ("guid",
                                                        _("GUID"),
                                                        _("GUID of the server peer"),
                                                        NULL,
                                                        G_PARAM_READABLE |
                                                        G_PARAM_WRITABLE |
                                                        G_PARAM_CONSTRUCT_ONLY |
                                                        G_PARAM_STATIC_NAME |
                                                        G_PARAM_STATIC_BLURB |
                                                        G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:unique-name:
   *
   * The unique name as assigned by the message bus or %NULL if the
   * connection is not open or not a message bus connection.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_UNIQUE_NAME,
                                   g_param_spec_string ("unique-name",
                                                        _("unique-name"),
                                                        _("Unique name of bus connection"),
                                                        NULL,
                                                        G_PARAM_READABLE |
                                                        G_PARAM_STATIC_NAME |
                                                        G_PARAM_STATIC_BLURB |
                                                        G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:closed:
   *
   * A boolean specifying whether the connection has been closed.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_CLOSED,
                                   g_param_spec_boolean ("closed",
                                                         _("Closed"),
                                                         _("Whether the connection is closed"),
                                                         FALSE,
                                                         G_PARAM_READABLE |
                                                         G_PARAM_STATIC_NAME |
                                                         G_PARAM_STATIC_BLURB |
                                                         G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:exit-on-close:
   *
   * A boolean specifying whether the process will be terminated (by
   * calling <literal>raise(SIGTERM)</literal>) if the connection
   * is closed by the remote peer.
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   *
   * Since: 2.26
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_EXIT_ON_CLOSE,
                                   g_param_spec_boolean ("exit-on-close",
                                                         _("Exit on close"),
                                                         _("Whether the process is terminated when the connection is closed"),
                                                         FALSE,
                                                         G_PARAM_READABLE |
                                                         G_PARAM_WRITABLE |
                                                         G_PARAM_STATIC_NAME |
                                                         G_PARAM_STATIC_BLURB |
                                                         G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:capabilities:
   *
   * Flags from the #GDBusCapabilityFlags enumeration
   * representing connection features negotiated with the other peer.
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   *
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   */
  g_object_class_install_property (gobject_class,
                                   PROP_CAPABILITY_FLAGS,
                                   g_param_spec_flags ("capabilities",
                                                       _("Capabilities"),
                                                       _("Capabilities"),
                                                       G_TYPE_DBUS_CAPABILITY_FLAGS,
                                                       G_DBUS_CAPABILITY_FLAGS_NONE,
                                                       G_PARAM_READABLE |
                                                       G_PARAM_STATIC_NAME |
                                                       G_PARAM_STATIC_BLURB |
                                                       G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection:authentication-observer:
   *
   * A #GDBusAuthObserver object to assist in the authentication process or %NULL.
668 669
   *
   * Since: 2.26
670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
   */
  g_object_class_install_property (gobject_class,
                                   PROP_AUTHENTICATION_OBSERVER,
                                   g_param_spec_object ("authentication-observer",
                                                        _("Authentication Observer"),
                                                        _("Object used to assist in the authentication process"),
                                                        G_TYPE_DBUS_AUTH_OBSERVER,
                                                        G_PARAM_WRITABLE |
                                                        G_PARAM_CONSTRUCT_ONLY |
                                                        G_PARAM_STATIC_NAME |
                                                        G_PARAM_STATIC_BLURB |
                                                        G_PARAM_STATIC_NICK));

  /**
   * GDBusConnection::closed:
   * @connection: The #GDBusConnection emitting the signal.
   * @remote_peer_vanished: %TRUE if @connection is closed because the
   * remote peer closed its end of the connection.
   * @error: A #GError with more details about the event or %NULL.
   *
   * Emitted when the connection is closed.
   *
   * The cause of this event can be
   * <itemizedlist>
   * <listitem><para>
   *    If g_dbus_connection_close() is called. In this case
   *    @remote_peer_vanished is set to %FALSE and @error is %NULL.
   * </para></listitem>
   * <listitem><para>
   *    If the remote peer closes the connection. In this case
   *    @remote_peer_vanished is set to %TRUE and @error is set.
   * </para></listitem>
   * <listitem><para>
   *    If the remote peer sends invalid or malformed data. In this
   *    case @remote_peer_vanished is set to %FALSE and @error
   *    is set.
   * </para></listitem>
   * </itemizedlist>
   *
   * Upon receiving this signal, you should give up your reference to
   * @connection. You are guaranteed that this signal is emitted only
   * once.
712 713
   *
   * Since: 2.26
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
   */
  signals[CLOSED_SIGNAL] = g_signal_new ("closed",
                                         G_TYPE_DBUS_CONNECTION,
                                         G_SIGNAL_RUN_LAST,
                                         G_STRUCT_OFFSET (GDBusConnectionClass, closed),
                                         NULL,
                                         NULL,
                                         _gio_marshal_VOID__BOOLEAN_BOXED,
                                         G_TYPE_NONE,
                                         2,
                                         G_TYPE_BOOLEAN,
                                         G_TYPE_ERROR);
}

static void
g_dbus_connection_init (GDBusConnection *connection)
{
  connection->priv = G_TYPE_INSTANCE_GET_PRIVATE (connection, G_TYPE_DBUS_CONNECTION, GDBusConnectionPrivate);

  connection->priv->lock = g_mutex_new ();
  connection->priv->init_lock = g_mutex_new ();

  connection->priv->map_method_serial_to_send_message_data = g_hash_table_new (g_direct_hash, g_direct_equal);

  connection->priv->map_rule_to_signal_data = g_hash_table_new (g_str_hash,
                                                                g_str_equal);
  connection->priv->map_id_to_signal_data = g_hash_table_new (g_direct_hash,
                                                              g_direct_equal);
  connection->priv->map_sender_to_signal_data_array = g_hash_table_new_full (g_str_hash,
                                                                             g_str_equal,
                                                                             g_free,
                                                                             NULL);

  connection->priv->map_object_path_to_eo = g_hash_table_new_full (g_str_hash,
                                                                   g_str_equal,
                                                                   NULL,
                                                                   (GDestroyNotify) exported_object_free);

  connection->priv->map_id_to_ei = g_hash_table_new (g_direct_hash,
                                                     g_direct_equal);

  connection->priv->map_object_path_to_es = g_hash_table_new_full (g_str_hash,
                                                                   g_str_equal,
                                                                   NULL,
                                                                   (GDestroyNotify) exported_subtree_free);

  connection->priv->map_id_to_es = g_hash_table_new (g_direct_hash,
                                                     g_direct_equal);

  connection->priv->main_context_at_construction = g_main_context_get_thread_default ();
  if (connection->priv->main_context_at_construction != NULL)
    g_main_context_ref (connection->priv->main_context_at_construction);

  connection->priv->filters = g_ptr_array_new ();
}

GIOStream *
g_dbus_connection_get_stream (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  return connection->priv->stream;
}


/**
 * g_dbus_connection_is_closed:
 * @connection: A #GDBusConnection.
 *
 * Gets whether @connection is closed.
 *
 * Returns: %TRUE if the connection is closed, %FALSE otherwise.
785 786 787
 *
 * Since: 2.26
 */
788 789 790 791 792 793 794 795 796 797 798 799 800 801
gboolean
g_dbus_connection_is_closed (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
  return connection->priv->closed;
}

/**
 * g_dbus_connection_get_capabilities:
 * @connection: A #GDBusConnection.
 *
 * Gets the capabilities negotiated with the remote peer
 *
 * Returns: One or more flags from the #GDBusCapabilityFlags enumeration.
802 803
 *
 * Since: 2.26
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
 */
GDBusCapabilityFlags
g_dbus_connection_get_capabilities (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), G_DBUS_CAPABILITY_FLAGS_NONE);
  return connection->priv->capabilities;
}


/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  GDBusConnection *connection;
  GError *error;
  gboolean remote_peer_vanished;
} EmitClosedData;

static void
emit_closed_data_free (EmitClosedData *data)
{
  g_object_unref (data->connection);
  if (data->error != NULL)
    g_error_free (data->error);
  g_free (data);
}

static gboolean
emit_closed_in_idle (gpointer user_data)
{
  EmitClosedData *data = user_data;
  gboolean result;

  g_object_notify (G_OBJECT (data->connection), "closed");
  g_signal_emit (data->connection,
                 signals[CLOSED_SIGNAL],
                 0,
                 data->remote_peer_vanished,
                 data->error,
                 &result);
  return FALSE;
}

/* Can be called from any thread, must hold lock */
static void
set_closed_unlocked (GDBusConnection *connection,
                     gboolean  remote_peer_vanished,
                     GError   *error)
{
  GSource *idle_source;
  EmitClosedData *data;

  CONNECTION_ENSURE_LOCK (connection);

  g_assert (!connection->priv->closed);

  connection->priv->closed = TRUE;

  data = g_new0 (EmitClosedData, 1);
  data->connection = g_object_ref (connection);
  data->remote_peer_vanished = remote_peer_vanished;
  data->error = error != NULL ? g_error_copy (error) : NULL;

  idle_source = g_idle_source_new ();
  g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
  g_source_set_callback (idle_source,
                         emit_closed_in_idle,
                         data,
                         (GDestroyNotify) emit_closed_data_free);
  g_source_attach (idle_source, connection->priv->main_context_at_construction);
  g_source_unref (idle_source);
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * g_dbus_connection_close:
 * @connection: A #GDBusConnection.
 *
 * Closes @connection. Note that this never causes the process to
 * exit (this might only happen if the other end of a shared message
 * bus connection disconnects).
 *
 * If @connection is already closed, this method does nothing.
888 889
 *
 * Since: 2.26
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023
 */
void
g_dbus_connection_close (GDBusConnection *connection)
{
  g_return_if_fail (G_IS_DBUS_CONNECTION (connection));

  CONNECTION_LOCK (connection);
  if (!connection->priv->closed)
  {
    GError *error = NULL;

    /* TODO: do this async */
    //g_debug ("closing connection %p's stream %p", connection, connection->priv->stream);
    if (!g_io_stream_close (connection->priv->stream, NULL, &error))
      {
        g_warning ("Error closing stream: %s", error->message);
        g_error_free (error);
      }

    set_closed_unlocked (connection, FALSE, NULL);
  }
  CONNECTION_UNLOCK (connection);
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean
g_dbus_connection_send_message_unlocked (GDBusConnection     *connection,
                                         GDBusMessage        *message,
                                         volatile guint32    *out_serial,
                                         GError             **error)
{
  guchar *blob;
  gsize blob_size;
  guint32 serial_to_use;
  gboolean ret;

  CONNECTION_ENSURE_LOCK (connection);

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
  g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);

  /* TODO: check all necessary headers are present */

  ret = FALSE;
  blob = NULL;

  if (out_serial != NULL)
    *out_serial = 0;

  if (connection->priv->closed)
    {
      g_set_error_literal (error,
                           G_IO_ERROR,
                           G_IO_ERROR_CLOSED,
                           _("The connection is closed"));
      goto out;
    }

  blob = g_dbus_message_to_blob (message,
                                 &blob_size,
                                 error);
  if (blob == NULL)
    goto out;

  serial_to_use = ++connection->priv->last_serial; /* TODO: handle overflow */

  switch (blob[0])
    {
    case 'l':
      ((guint32 *) blob)[2] = GUINT32_TO_LE (serial_to_use);
      break;
    case 'B':
      ((guint32 *) blob)[2] = GUINT32_TO_BE (serial_to_use);
      break;
    default:
      g_assert_not_reached ();
      break;
    }

#if 0
  g_printerr ("Writing message of %" G_GSIZE_FORMAT " bytes (serial %d) on %p:\n",
              blob_size, serial_to_use, connection);
  g_printerr ("----\n");
  hexdump (blob, blob_size);
  g_printerr ("----\n");
#endif

  /* TODO: use connection->priv->auth to encode the blob */

  if (out_serial != NULL)
    {
      *out_serial = serial_to_use;
    }
  g_dbus_message_set_serial (message, serial_to_use);

  _g_dbus_worker_send_message (connection->priv->worker,
                               message,
                               (gchar*) blob,
                               blob_size);
  blob = NULL; /* since _g_dbus_worker_send_message() steals the blob */

  ret = TRUE;

 out:
  g_free (blob);

  return ret;
}

/**
 * g_dbus_connection_send_message:
 * @connection: A #GDBusConnection.
 * @message: A #GDBusMessage
 * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
 * @error: Return location for error or %NULL.
 *
 * Asynchronously sends @message to the peer represented by @connection.
 *
 * If @out_serial is not %NULL, then the serial number assigned to
 * @message by @connection will be written to this location prior to
 * submitting the message to the underlying transport.
 *
 * If @connection is closed then the operation will fail with
 * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
 * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
 * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
 *
 * See <xref linkend="gdbus-server"/> and <xref
 * linkend="gdbus-unix-fd-client"/> for an example of how to use this
 * low-level API to send and receive UNIX file descriptors.
 *
 * Returns: %TRUE if the message was well-formed and queued for
 * transmission, %FALSE if @error is set.
1024 1025
 *
 * Since: 2.26
1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
 */
gboolean
g_dbus_connection_send_message (GDBusConnection     *connection,
                                GDBusMessage        *message,
                                volatile guint32    *out_serial,
                                GError             **error)
{
  gboolean ret;

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
  g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), FALSE);
  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

  CONNECTION_LOCK (connection);
  ret = g_dbus_connection_send_message_unlocked (connection, message, out_serial, error);
  CONNECTION_UNLOCK (connection);
  return ret;
}

/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  volatile gint ref_count;
  GDBusConnection *connection;
  guint32 serial;
  GSimpleAsyncResult *simple;

  GMainContext *main_context;

  GCancellable *cancellable;

  gulong cancellable_handler_id;

  GSource *timeout_source;

  gboolean delivered;
} SendMessageData;

static SendMessageData *
send_message_data_ref (SendMessageData *data)
{
  g_atomic_int_inc (&data->ref_count);
  return data;
}

static void
send_message_data_unref (SendMessageData *data)
{
  if (g_atomic_int_dec_and_test (&data->ref_count))
    {
      g_assert (data->timeout_source == NULL);
      g_assert (data->simple == NULL);
      g_assert (data->cancellable_handler_id == 0);
      g_object_unref (data->connection);
      if (data->cancellable != NULL)
        g_object_unref (data->cancellable);
      if (data->main_context != NULL)
        g_main_context_unref (data->main_context);
      g_free (data);
    }
}

/* ---------------------------------------------------------------------------------------------------- */

/* can be called from any thread with lock held - caller must have prepared GSimpleAsyncResult already */
static void
send_message_with_reply_deliver (SendMessageData *data)
{
  CONNECTION_ENSURE_LOCK (data->connection);

  g_assert (!data->delivered);

  data->delivered = TRUE;

  g_simple_async_result_complete_in_idle (data->simple);
  g_object_unref (data->simple);
  data->simple = NULL;

  if (data->timeout_source != NULL)
    {
      g_source_destroy (data->timeout_source);
      data->timeout_source = NULL;
    }
  if (data->cancellable_handler_id > 0)
    {
      g_cancellable_disconnect (data->cancellable, data->cancellable_handler_id);
      data->cancellable_handler_id = 0;
    }

  g_warn_if_fail (g_hash_table_remove (data->connection->priv->map_method_serial_to_send_message_data,
                                       GUINT_TO_POINTER (data->serial)));

  send_message_data_unref (data);
}

/* ---------------------------------------------------------------------------------------------------- */

/* must hold lock */
static void
send_message_data_deliver_reply_unlocked (SendMessageData *data,
                                          GDBusMessage    *reply)
{
  if (data->delivered)
    goto out;

  g_simple_async_result_set_op_res_gpointer (data->simple,
                                             g_object_ref (reply),
                                             g_object_unref);

  send_message_with_reply_deliver (data);

 out:
  ;
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean
send_message_with_reply_cancelled_idle_cb (gpointer user_data)
{
  SendMessageData *data = user_data;

  CONNECTION_LOCK (data->connection);
  if (data->delivered)
    goto out;

  g_simple_async_result_set_error (data->simple,
                                   G_IO_ERROR,
                                   G_IO_ERROR_CANCELLED,
                                   _("Operation was cancelled"));

  send_message_with_reply_deliver (data);

 out:
  CONNECTION_UNLOCK (data->connection);
  return FALSE;
}

/* Can be called from any thread with or without lock held */
static void
send_message_with_reply_cancelled_cb (GCancellable *cancellable,
                                      gpointer      user_data)
{
  SendMessageData *data = user_data;
  GSource *idle_source;

  /* postpone cancellation to idle handler since we may be called directly
   * via g_cancellable_connect() (e.g. holding lock)
   */
  idle_source = g_idle_source_new ();
  g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
  g_source_set_callback (idle_source,
                         send_message_with_reply_cancelled_idle_cb,
                         send_message_data_ref (data),
                         (GDestroyNotify) send_message_data_unref);
  g_source_attach (idle_source, data->main_context);
  g_source_unref (idle_source);
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean
send_message_with_reply_timeout_cb (gpointer user_data)
{
  SendMessageData *data = user_data;

  CONNECTION_LOCK (data->connection);
  if (data->delivered)
    goto out;

  g_simple_async_result_set_error (data->simple,
                                   G_IO_ERROR,
                                   G_IO_ERROR_TIMED_OUT,
                                   _("Timeout was reached"));

  send_message_with_reply_deliver (data);

 out:
  CONNECTION_UNLOCK (data->connection);

  return FALSE;
}

/* ---------------------------------------------------------------------------------------------------- */

static void
g_dbus_connection_send_message_with_reply_unlocked (GDBusConnection     *connection,
                                                    GDBusMessage        *message,
                                                    gint                 timeout_msec,
                                                    volatile guint32    *out_serial,
                                                    GCancellable        *cancellable,
                                                    GAsyncReadyCallback  callback,
                                                    gpointer             user_data)
{
  GSimpleAsyncResult *simple;
  SendMessageData *data;
  GError *error;
  volatile guint32 serial;

  data = NULL;

  if (out_serial == NULL)
    out_serial = &serial;

  if (timeout_msec == -1)
    timeout_msec = 30 * 1000; /* TODO: check 30 secs is the default timeout */

  simple = g_simple_async_result_new (G_OBJECT (connection),
                                      callback,
                                      user_data,
                                      g_dbus_connection_send_message_with_reply);

  if (g_cancellable_is_cancelled (cancellable))
    {
      g_simple_async_result_set_error (simple,
                                       G_IO_ERROR,
                                       G_IO_ERROR_CANCELLED,
                                       _("Operation was cancelled"));
      g_simple_async_result_complete_in_idle (simple);
      g_object_unref (simple);
      goto out;
    }

  if (connection->priv->closed)
    {
      g_simple_async_result_set_error (simple,
                                       G_IO_ERROR,
                                       G_IO_ERROR_CLOSED,
                                       _("The connection is closed"));
      g_simple_async_result_complete_in_idle (simple);
      g_object_unref (simple);
      goto out;
    }

  error = NULL;
  if (!g_dbus_connection_send_message_unlocked (connection, message, out_serial, &error))
    {
      g_simple_async_result_set_from_error (simple, error);
      g_simple_async_result_complete_in_idle (simple);
      g_object_unref (simple);
      goto out;
    }

  data = g_new0 (SendMessageData, 1);
  data->ref_count = 1;
  data->connection = g_object_ref (connection);
  data->simple = simple;
  data->serial = *out_serial;
  data->main_context = g_main_context_get_thread_default ();
  if (data->main_context != NULL)
    g_main_context_ref (data->main_context);

  if (cancellable != NULL)
    {
      data->cancellable = g_object_ref (cancellable);
      data->cancellable_handler_id = g_cancellable_connect (cancellable,
                                                            G_CALLBACK (send_message_with_reply_cancelled_cb),
                                                            send_message_data_ref (data),
                                                            (GDestroyNotify) send_message_data_unref);
      g_object_set_data_full (G_OBJECT (simple),
                              "cancellable",
                              g_object_ref (cancellable),
                              (GDestroyNotify) g_object_unref);
    }

  data->timeout_source = g_timeout_source_new (timeout_msec);
  g_source_set_priority (data->timeout_source, G_PRIORITY_DEFAULT);
  g_source_set_callback (data->timeout_source,
                         send_message_with_reply_timeout_cb,
                         send_message_data_ref (data),
                         (GDestroyNotify) send_message_data_unref);
  g_source_attach (data->timeout_source, data->main_context);
  g_source_unref (data->timeout_source);

  g_hash_table_insert (connection->priv->map_method_serial_to_send_message_data,
                       GUINT_TO_POINTER (*out_serial),
                       data);

 out:
  ;
}

/**
 * g_dbus_connection_send_message_with_reply:
 * @connection: A #GDBusConnection.
 * @message: A #GDBusMessage.
 * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
 * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
 * @cancellable: A #GCancellable or %NULL.
 * @callback: A #GAsyncReadyCallback to call when the request is satisfied or %NULL if you don't
 * care about the result.
 * @user_data: The data to pass to @callback.
 *
 * Asynchronously sends @message to the peer represented by @connection.
 *
 * If @out_serial is not %NULL, then the serial number assigned to
 * @message by @connection will be written to this location prior to
 * submitting the message to the underlying transport.
 *
 * If @connection is closed then the operation will fail with
 * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
 * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
 * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
 *
 * This is an asynchronous method. When the operation is finished, @callback will be invoked
 * in the <link linkend="g-main-context-push-thread-default">thread-default main loop</link>
 * of the thread you are calling this method from. You can then call
 * g_dbus_connection_send_message_with_reply_finish() to get the result of the operation.
 * See g_dbus_connection_send_message_with_reply_sync() for the synchronous version.
 *
 * See <xref linkend="gdbus-server"/> and <xref
 * linkend="gdbus-unix-fd-client"/> for an example of how to use this
 * low-level API to send and receive UNIX file descriptors.
1340 1341
 *
 * Since: 2.26
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
 */
void
g_dbus_connection_send_message_with_reply (GDBusConnection     *connection,
                                           GDBusMessage        *message,
                                           gint                 timeout_msec,
                                           volatile guint32    *out_serial,
                                           GCancellable        *cancellable,
                                           GAsyncReadyCallback  callback,
                                           gpointer             user_data)
{
  g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
  g_return_if_fail (G_IS_DBUS_MESSAGE (message));
  g_return_if_fail (timeout_msec >= 0 || timeout_msec == -1);

  CONNECTION_LOCK (connection);
  g_dbus_connection_send_message_with_reply_unlocked (connection,
                                                      message,
                                                      timeout_msec,
                                                      out_serial,
                                                      cancellable,
                                                      callback,
                                                      user_data);
  CONNECTION_UNLOCK (connection);
}

/**
 * g_dbus_connection_send_message_with_reply_finish:
 * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_send_message_with_reply().
 * @error: Return location for error or %NULL.
 *
 * Finishes an operation started with g_dbus_connection_send_message_with_reply().
 *
 * Note that @error is only set if a local in-process error
 * occured. That is to say that the returned #GDBusMessage object may
 * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
 * g_dbus_message_to_gerror() to transcode this to a #GError.
 *
 * See <xref linkend="gdbus-server"/> and <xref
 * linkend="gdbus-unix-fd-client"/> for an example of how to use this
 * low-level API to send and receive UNIX file descriptors.
 *
 * Returns: A #GDBusMessage or %NULL if @error is set.
1384 1385
 *
 * Since: 2.26
1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
 */
GDBusMessage *
g_dbus_connection_send_message_with_reply_finish (GDBusConnection     *connection,
                                                  GAsyncResult        *res,
                                                  GError             **error)
{
  GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
  GDBusMessage *reply;
  GCancellable *cancellable;

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  reply = NULL;

  g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_connection_send_message_with_reply);

  if (g_simple_async_result_propagate_error (simple, error))
    goto out;

  reply = g_object_ref (g_simple_async_result_get_op_res_gpointer (simple));
  cancellable = g_object_get_data (G_OBJECT (simple), "cancellable");
  if (cancellable != NULL && g_cancellable_is_cancelled (cancellable))
    {
      g_object_unref (reply);
      reply = NULL;
      g_set_error_literal (error,
                           G_IO_ERROR,
                           G_IO_ERROR_CANCELLED,
                           _("Operation was cancelled"));
    }
 out:
  return reply;
}

/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  GAsyncResult *res;
  GMainContext *context;
  GMainLoop *loop;
} SendMessageSyncData;

static void
send_message_with_reply_sync_cb (GDBusConnection *connection,
                                 GAsyncResult    *res,
                                 gpointer         user_data)
{
  SendMessageSyncData *data = user_data;
  data->res = g_object_ref (res);
  g_main_loop_quit (data->loop);
}

/**
 * g_dbus_connection_send_message_with_reply_sync:
 * @connection: A #GDBusConnection.
 * @message: A #GDBusMessage.
 * @timeout_msec: The timeout in milliseconds or -1 to use the default timeout.
 * @out_serial: Return location for serial number assigned to @message when sending it or %NULL.
 * @cancellable: A #GCancellable or %NULL.
 * @error: Return location for error or %NULL.
 *
 * Synchronously sends @message to the peer represented by @connection
 * and blocks the calling thread until a reply is received or the
 * timeout is reached. See g_dbus_connection_send_message_with_reply()
 * for the asynchronous version of this method.
 *
 * If @out_serial is not %NULL, then the serial number assigned to
 * @message by @connection will be written to this location prior to
 * submitting the message to the underlying transport.
 *
 * If @connection is closed then the operation will fail with
 * %G_IO_ERROR_CLOSED. If @cancellable is canceled, the operation will
 * fail with %G_IO_ERROR_CANCELLED. If @message is not well-formed,
 * the operation fails with %G_IO_ERROR_INVALID_ARGUMENT.
 *
 * Note that @error is only set if a local in-process error
 * occured. That is to say that the returned #GDBusMessage object may
 * be of type %G_DBUS_MESSAGE_TYPE_ERROR. Use
 * g_dbus_message_to_gerror() to transcode this to a #GError.
 *
 * See <xref linkend="gdbus-server"/> and <xref
 * linkend="gdbus-unix-fd-client"/> for an example of how to use this
 * low-level API to send and receive UNIX file descriptors.
 *
 * Returns: A #GDBusMessage that is the reply to @message or %NULL if @error is set.
1473 1474
 *
 * Since: 2.26
1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579
 */
GDBusMessage *
g_dbus_connection_send_message_with_reply_sync (GDBusConnection     *connection,
                                                GDBusMessage        *message,
                                                gint                 timeout_msec,
                                                volatile guint32    *out_serial,
                                                GCancellable        *cancellable,
                                                GError             **error)
{
  SendMessageSyncData *data;
  GDBusMessage *reply;

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  g_return_val_if_fail (G_IS_DBUS_MESSAGE (message), NULL);
  g_return_val_if_fail (timeout_msec >= 0 || timeout_msec == -1, NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  data = g_new0 (SendMessageSyncData, 1);
  data->context = g_main_context_new ();
  data->loop = g_main_loop_new (data->context, FALSE);

  g_main_context_push_thread_default (data->context);

  g_dbus_connection_send_message_with_reply (connection,
                                             message,
                                             timeout_msec,
                                             out_serial,
                                             cancellable,
                                             (GAsyncReadyCallback) send_message_with_reply_sync_cb,
                                             data);
  g_main_loop_run (data->loop);
  reply = g_dbus_connection_send_message_with_reply_finish (connection,
                                                            data->res,
                                                            error);

  g_main_context_pop_thread_default (data->context);

  g_main_context_unref (data->context);
  g_main_loop_unref (data->loop);
  g_object_unref (data->res);
  g_free (data);

  return reply;
}

/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  GDBusMessageFilterFunction func;
  gpointer user_data;
} FilterCallback;

typedef struct
{
  guint                       id;
  GDBusMessageFilterFunction  filter_function;
  gpointer                    user_data;
  GDestroyNotify              user_data_free_func;
} FilterData;

/* Called in worker's thread - we must not block */
static void
on_worker_message_received (GDBusWorker  *worker,
                            GDBusMessage *message,
                            gpointer      user_data)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (user_data);
  FilterCallback *filters;
  gboolean consumed_by_filter;
  guint num_filters;
  guint n;

  //g_debug ("in on_worker_message_received");

  g_object_ref (connection);

  /* First collect the set of callback functions */
  CONNECTION_LOCK (connection);
  num_filters = connection->priv->filters->len;
  filters = g_new0 (FilterCallback, num_filters);
  for (n = 0; n < num_filters; n++)
    {
      FilterData *data = connection->priv->filters->pdata[n];
      filters[n].func = data->filter_function;
      filters[n].user_data = data->user_data;
    }
  CONNECTION_UNLOCK (connection);

  /* the call the filters in order (without holding the lock) */
  consumed_by_filter = FALSE;
  for (n = 0; n < num_filters; n++)
    {
      consumed_by_filter = filters[n].func (connection,
                                            message,
                                            filters[n].user_data);
      if (consumed_by_filter)
        break;
    }

  /* Standard dispatch unless the filter ate the message */
  if (!consumed_by_filter)
    {
      GDBusMessageType message_type;

1580
      message_type = g_dbus_message_get_message_type (message);
1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904
      if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_RETURN || message_type == G_DBUS_MESSAGE_TYPE_ERROR)
        {
          guint32 reply_serial;
          SendMessageData *send_message_data;

          reply_serial = g_dbus_message_get_reply_serial (message);
          CONNECTION_LOCK (connection);
          send_message_data = g_hash_table_lookup (connection->priv->map_method_serial_to_send_message_data,
                                                   GUINT_TO_POINTER (reply_serial));
          if (send_message_data != NULL)
            {
              //g_debug ("delivering reply/error for serial %d for %p", reply_serial, connection);
              send_message_data_deliver_reply_unlocked (send_message_data, message);
            }
          else
            {
              //g_debug ("message reply/error for serial %d but no SendMessageData found for %p", reply_serial, connection);
            }
          CONNECTION_UNLOCK (connection);
        }
      else if (message_type == G_DBUS_MESSAGE_TYPE_SIGNAL)
        {
          CONNECTION_LOCK (connection);
          distribute_signals (connection, message);
          CONNECTION_UNLOCK (connection);
        }
      else if (message_type == G_DBUS_MESSAGE_TYPE_METHOD_CALL)
        {
          CONNECTION_LOCK (connection);
          distribute_method_call (connection, message);
          CONNECTION_UNLOCK (connection);
        }
    }

  g_object_unref (connection);
  g_free (filters);
}

/* Called in worker's thread - we must not block */
static void
on_worker_closed (GDBusWorker *worker,
                  gboolean     remote_peer_vanished,
                  GError      *error,
                  gpointer     user_data)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (user_data);

  //g_debug ("in on_worker_closed: %s", error->message);

  CONNECTION_LOCK (connection);
  if (!connection->priv->closed)
    set_closed_unlocked (connection, remote_peer_vanished, error);
  CONNECTION_UNLOCK (connection);
}

/* ---------------------------------------------------------------------------------------------------- */

/* Determines the biggest set of capabilities we can support on this connection */
static GDBusCapabilityFlags
get_offered_capabilities_max (GDBusConnection *connection)
{
      GDBusCapabilityFlags ret;
      ret = G_DBUS_CAPABILITY_FLAGS_NONE;
#ifdef G_OS_UNIX
      if (G_IS_UNIX_CONNECTION (connection->priv->stream))
        {
          ret |= G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING;
        }
#endif
      return ret;
}


static gboolean
initable_init (GInitable       *initable,
               GCancellable    *cancellable,
               GError         **error)
{
  GDBusConnection *connection = G_DBUS_CONNECTION (initable);
  gboolean ret;

  /* This method needs to be idempotent to work with the singleton
   * pattern. See the docs for g_initable_init(). We implement this by
   * locking.
   *
   * Unfortunately we can't use the main lock since the on_worker_*()
   * callbacks above needs the lock during initialization (for message
   * bus connections we do a synchronous Hello() call on the bus).
   */
  g_mutex_lock (connection->priv->init_lock);

  ret = FALSE;

  if (connection->priv->is_initialized)
    {
      if (connection->priv->stream != NULL)
        ret = TRUE;
      else
        g_assert (connection->priv->initialization_error != NULL);
      goto out;
    }
  g_assert (connection->priv->initialization_error == NULL);

  /* The user can pass multiple (but mutally exclusive) construct
   * properties:
   *
   *  - stream (of type GIOStream)
   *  - address (of type gchar*)
   *
   * At the end of the day we end up with a non-NULL GIOStream
   * object in connection->priv->stream.
   */
  if (connection->priv->address != NULL)
    {
      g_assert (connection->priv->stream == NULL);

      if ((connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER) ||
          (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS))
        {
          g_set_error_literal (error,
                               G_IO_ERROR,
                               G_IO_ERROR_INVALID_ARGUMENT,
                               _("Unsupported flags encountered when constructing a client-side connection"));
          goto out;
        }

      connection->priv->stream = g_dbus_address_get_stream_sync (connection->priv->address,
                                                                 NULL, /* TODO: out_guid */
                                                                 cancellable,
                                                                 &connection->priv->initialization_error);
      if (connection->priv->stream == NULL)
        goto out;
    }
  else if (connection->priv->stream != NULL)
    {
      /* nothing to do */
    }
  else
    {
      g_assert_not_reached ();
    }

  /* Authenticate the connection */
  if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER)
    {
      g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT));
      g_assert (connection->priv->guid != NULL);
      connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
      if (!_g_dbus_auth_run_server (connection->priv->auth,
                                    connection->priv->authentication_observer,
                                    connection->priv->guid,
                                    (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS),
                                    get_offered_capabilities_max (connection),
                                    &connection->priv->capabilities,
                                    &connection->priv->crendentials,
                                    cancellable,
                                    &connection->priv->initialization_error))
        goto out;
    }
  else if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_CLIENT)
    {
      g_assert (!(connection->priv->flags & G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER));
      g_assert (connection->priv->guid == NULL);
      connection->priv->auth = _g_dbus_auth_new (connection->priv->stream);
      connection->priv->guid = _g_dbus_auth_run_client (connection->priv->auth,
                                                        get_offered_capabilities_max (connection),
                                                        &connection->priv->capabilities,
                                                        cancellable,
                                                        &connection->priv->initialization_error);
      if (connection->priv->guid == NULL)
        goto out;
    }

  if (connection->priv->authentication_observer != NULL)
    {
      g_object_unref (connection->priv->authentication_observer);
      connection->priv->authentication_observer = NULL;
    }

  //g_output_stream_flush (G_SOCKET_CONNECTION (connection->priv->stream)

  //g_debug ("haz unix fd passing powers: %d", connection->priv->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING);

  /* Hack used until
   *
   *  https://bugzilla.gnome.org/show_bug.cgi?id=616458
   *
   * has been resolved
   */
  if (G_IS_SOCKET_CONNECTION (connection->priv->stream))
    {
      g_socket_set_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (connection->priv->stream)), FALSE);
    }

  connection->priv->worker = _g_dbus_worker_new (connection->priv->stream,
                                                 connection->priv->capabilities,
                                                 on_worker_message_received,
                                                 on_worker_closed,
                                                 connection);

  /* if a bus connection, invoke org.freedesktop.DBus.Hello - this is how we're getting a name */
  if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
    {
      GVariant *hello_result;
      const gchar *s;

      hello_result = g_dbus_connection_invoke_method_sync (connection,
                                                           "org.freedesktop.DBus", /* name */
                                                           "/org/freedesktop/DBus", /* path */
                                                           "org.freedesktop.DBus", /* interface */
                                                           "Hello",
                                                           NULL, /* parameters */
                                                           G_DBUS_INVOKE_METHOD_FLAGS_NONE,
                                                           -1,
                                                           NULL, /* TODO: cancellable */
                                                           &connection->priv->initialization_error);
      if (hello_result == NULL)
        goto out;

      g_variant_get (hello_result, "(s)", &s);
      connection->priv->bus_unique_name = g_strdup (s);
      g_variant_unref (hello_result);
      //g_debug ("unique name is `%s'", connection->priv->bus_unique_name);
    }

  connection->priv->is_initialized = TRUE;

  ret = TRUE;
 out:
  if (!ret)
    {
      g_assert (connection->priv->initialization_error != NULL);
      g_propagate_error (error, g_error_copy (connection->priv->initialization_error));
    }

  g_mutex_unlock (connection->priv->init_lock);

  return ret;
}

static void
initable_iface_init (GInitableIface *initable_iface)
{
  initable_iface->init = initable_init;
}

/* ---------------------------------------------------------------------------------------------------- */

static void
async_init_thread (GSimpleAsyncResult *res,
		   GObject            *object,
		   GCancellable       *cancellable)
{
  GError *error = NULL;

  if (!g_initable_init (G_INITABLE (object), cancellable, &error))
    {
      g_simple_async_result_set_from_error (res, error);
      g_error_free (error);
    }
}

static void
async_initable_init_async (GAsyncInitable     *initable,
                           gint                io_priority,
                           GCancellable       *cancellable,
                           GAsyncReadyCallback callback,
                           gpointer            user_data)
{
  GSimpleAsyncResult *res;

  g_return_if_fail (G_IS_INITABLE (initable));

  res = g_simple_async_result_new (G_OBJECT (initable), callback, user_data,
				   async_initable_init_async);
  g_simple_async_result_run_in_thread (res, async_init_thread,
				       io_priority, cancellable);
  g_object_unref (res);
}

static gboolean
async_initable_init_finish (GAsyncInitable  *initable,
                            GAsyncResult    *res,
                            GError         **error)
{
  return TRUE; /* Errors handled by base impl */
}

static void
async_initable_iface_init (GAsyncInitableIface *async_initable_iface)
{
  /* We basically just want to use GIO's default implementation - though that one is
   * unfortunately broken, see #615111. So we copy-paste a fixed-up version.
   */
  async_initable_iface->init_async = async_initable_init_async;
  async_initable_iface->init_finish = async_initable_init_finish;
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * g_dbus_connection_new:
 * @stream: A #GIOStream.
 * @guid: The GUID to use if a authenticating as a server or %NULL.
 * @flags: Flags describing how to make the connection.
 * @authentication_observer: A #GDBusAuthObserver or %NULL.
 * @cancellable: A #GCancellable or %NULL.
 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
 * @user_data: The data to pass to @callback.
 *
 * Asynchronously sets up a D-Bus connection for exchanging D-Bus messages
 * with the end represented by @stream.
 *
 * If %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER is set in @flags,
 * @auth_observer (if not %NULL) is used to assist in the client
 * authentication process.
 *
 * When the operation is finished, @callback will be invoked. You can
 * then call g_dbus_connection_new_finish() to get the result of the
 * operation.
 *
 * This is a asynchronous failable constructor. See
 * g_dbus_connection_new_sync() for the synchronous
 * version.
1905 1906
 *
 * Since: 2.26
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937
 */
void
g_dbus_connection_new (GIOStream              *stream,
                       const gchar            *guid,
                       GDBusConnectionFlags    flags,
                       GDBusAuthObserver      *authentication_observer,
                       GCancellable           *cancellable,
                       GAsyncReadyCallback     callback,
                       gpointer                user_data)
{
  g_return_if_fail (G_IS_IO_STREAM (stream));
  g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
                              G_PRIORITY_DEFAULT,
                              cancellable,
                              callback,
                              user_data,
                              "stream", stream,
                              "guid", guid,
                              "flags", flags,
                              "authentication-observer", authentication_observer,
                              NULL);
}

/**
 * g_dbus_connection_new_finish:
 * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
 * @error: Return location for error or %NULL.
 *
 * Finishes an operation started with g_dbus_connection_new().
 *
 * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
1938 1939
 *
 * Since: 2.26
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
 */
GDBusConnection *
g_dbus_connection_new_finish (GAsyncResult        *res,
                              GError             **error)
{
  GObject *object;
  GObject *source_object;

  g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  source_object = g_async_result_get_source_object (res);
  g_assert (source_object != NULL);
  object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
                                        res,
                                        error);
  g_object_unref (source_object);
  if (object != NULL)
    return G_DBUS_CONNECTION (object);
  else
    return NULL;
}

/**
 * g_dbus_connection_new_sync:
 * @stream: A #GIOStream.
 * @guid: The GUID to use if a authenticating as a server or %NULL.
 * @flags: Flags describing how to make the connection.
 * @authentication_observer: A #GDBusAuthObserver or %NULL.
 * @cancellable: A #GCancellable or %NULL.
 * @error: Return location for error or %NULL.
 *
 * Synchronously sets up a D-Bus connection for exchanging D-Bus messages
 * with the end represented by @stream.
 *
 * If %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER is set in @flags,
 * @auth_observer (if not %NULL) is used to assist in the client
 * authentication process.
 *
 * This is a synchronous failable constructor. See
 * g_dbus_connection_new() for the asynchronous version.
 *
 * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
1983 1984
 *
 * Since: 2.26
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032
 */
GDBusConnection *
g_dbus_connection_new_sync (GIOStream              *stream,
                            const gchar            *guid,
                            GDBusConnectionFlags    flags,
                            GDBusAuthObserver      *authentication_observer,
                            GCancellable           *cancellable,
                            GError                **error)
{
  g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
  return g_initable_new (G_TYPE_DBUS_CONNECTION,
                         cancellable,
                         error,
                         "stream", stream,
                         "guid", guid,
                         "flags", flags,
                         "authentication-observer", authentication_observer,
                         NULL);
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * g_dbus_connection_new_for_address:
 * @address: A D-Bus address.
 * @flags: Flags describing how to make the connection.
 * @cancellable: A #GCancellable or %NULL.
 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
 * @user_data: The data to pass to @callback.
 *
 * Asynchronously connects and sets up a D-Bus client connection for
 * exchanging D-Bus messages with an endpoint specified by @address
 * which must be in the D-Bus address format.
 *
 * This constructor can only be used to initiate client-side
 * connections - use g_dbus_connection_new() if you need to act as the
 * server. In particular, @flags cannot contain the
 * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
 * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
 *
 * When the operation is finished, @callback will be invoked. You can
 * then call g_dbus_connection_new_finish() to get the result of the
 * operation.
 *
 * This is a asynchronous failable constructor. See
 * g_dbus_connection_new_for_address_sync() for the synchronous
 * version.
2033 2034
 *
 * Since: 2.26
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061
 */
void
g_dbus_connection_new_for_address (const gchar            *address,
                                   GDBusConnectionFlags    flags,
                                   GCancellable           *cancellable,
                                   GAsyncReadyCallback     callback,
                                   gpointer                user_data)
{
  g_return_if_fail (address != NULL);
  g_async_initable_new_async (G_TYPE_DBUS_CONNECTION,
                              G_PRIORITY_DEFAULT,
                              cancellable,
                              callback,
                              user_data,
                              "address", address,
                              "flags", flags,
                              NULL);
}

/**
 * g_dbus_connection_new_for_address_finish:
 * @res: A #GAsyncResult obtained from the #GAsyncReadyCallback passed to g_dbus_connection_new().
 * @error: Return location for error or %NULL.
 *
 * Finishes an operation started with g_dbus_connection_new_for_address().
 *
 * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2062 2063
 *
 * Since: 2.26
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 */
GDBusConnection *
g_dbus_connection_new_for_address_finish (GAsyncResult        *res,
                                          GError             **error)
{
  GObject *object;
  GObject *source_object;

  g_return_val_if_fail (G_IS_ASYNC_RESULT (res), NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  source_object = g_async_result_get_source_object (res);
  g_assert (source_object != NULL);
  object = g_async_initable_new_finish (G_ASYNC_INITABLE (source_object),
                                        res,
                                        error);
  g_object_unref (source_object);
  if (object != NULL)
    return G_DBUS_CONNECTION (object);
  else
    return NULL;
}

/**
 * g_dbus_connection_new_for_address_sync:
 * @address: A D-Bus address.
 * @flags: Flags describing how to make the connection.
 * @cancellable: A #GCancellable or %NULL.
 * @error: Return location for error or %NULL.
 *
 * Synchronously connects and sets up a D-Bus client connection for
 * exchanging D-Bus messages with an endpoint specified by @address
 * which must be in the D-Bus address format.
 *
 * This constructor can only be used to initiate client-side
 * connections - use g_dbus_connection_new_sync() if you need to act
 * as the server. In particular, @flags cannot contain the
 * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER or
 * %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_ALLOW_ANONYMOUS flags.
 *
 * This is a synchronous failable constructor. See
 * g_dbus_connection_new_for_address() for the asynchronous version.
 *
 * Returns: A #GDBusConnection or %NULL if @error is set. Free with g_object_unref().
2108 2109
 *
 * Since: 2.26
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 */
GDBusConnection *
g_dbus_connection_new_for_address_sync (const gchar            *address,
                                        GDBusConnectionFlags    flags,
                                        GCancellable           *cancellable,
                                        GError                **error)
{
  g_return_val_if_fail (address != NULL, NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);
  return g_initable_new (G_TYPE_DBUS_CONNECTION,
                         cancellable,
                         error,
                         "address", address,
                         "flags", flags,
                         NULL);
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * g_dbus_connection_set_exit_on_close:
 * @connection: A #GDBusConnection.
 * @exit_on_close: Whether the process should be terminated
 * when @connection is closed by the remote peer.
 *
 * Sets whether the process should be terminated when @connection is
 * closed by the remote peer. See #GDBusConnection:exit-on-close for
 * more details.
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 *
 * Since: 2.26
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 */
void
g_dbus_connection_set_exit_on_close (GDBusConnection *connection,
                                     gboolean         exit_on_close)
{
  g_return_if_fail (G_IS_DBUS_CONNECTION (connection));
  connection->priv->exit_on_close = exit_on_close;
}

/**
 * g_dbus_connection_get_exit_on_close:
 * @connection: A #GDBusConnection.
 *
 * Gets whether the process is terminated when @connection is
 * closed by the remote peer. See
 * #GDBusConnection:exit-on-close for more details.
 *
 * Returns: Whether the process is terminated when @connection is
 * closed by the remote peer.
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 *
 * Since: 2.26
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 */
gboolean
g_dbus_connection_get_exit_on_close (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), FALSE);
  return connection->priv->exit_on_close;
}

/**
 * g_dbus_connection_get_guid:
 * @connection: A #GDBusConnection.
 *
 * The GUID of the peer performing the role of server when
 * authenticating. See #GDBusConnection:guid for more details.
 *
 * Returns: The GUID. Do not free this string, it is owned by
 * @connection.
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 *
 * Since: 2.26
 */
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const gchar *
g_dbus_connection_get_guid (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  return connection->priv->guid;
}

/**
 * g_dbus_connection_get_unique_name:
 * @connection: A #GDBusConnection.
 *
 * Gets the unique name of @connection as assigned by the message
 * bus. This can also be used to figure out if @connection is a
 * message bus connection.
 *
 * Returns: The unique name or %NULL if @connection is not a message
 * bus connection. Do not free this string, it is owned by
 * @connection.
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 *
 * Since: 2.26
 */
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const gchar *
g_dbus_connection_get_unique_name (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  return connection->priv->bus_unique_name;
}

/**
 * g_dbus_connection_get_peer_credentials:
 * @connection: A #GDBusConnection.
 *
 * Gets the credentials of the authenticated peer. This will always
 * return %NULL unless @connection acted as a server
 * (e.g. %G_DBUS_CONNECTION_FLAGS_AUTHENTICATION_SERVER was passed)
 * when set up and the client passed credentials as part of the
 * authentication process.
 *
 * In a message bus setup, the message bus is always the server and
 * each application is a client. So this method will always return
 * %NULL for message bus clients.
 *
 * Returns: A #GCredentials or %NULL if not available. Do not free
 * this object, it is owned by @connection.
2225 2226
 *
 * Since: 2.26
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 */
GCredentials *
g_dbus_connection_get_peer_credentials (GDBusConnection *connection)
{
  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), NULL);
  return connection->priv->crendentials;
}

/* ---------------------------------------------------------------------------------------------------- */

static guint _global_filter_id = 1;

/**
 * g_dbus_connection_add_filter:
 * @connection: A #GDBusConnection.
 * @filter_function: A filter function.
 * @user_data: User data to pass to @filter_function.
 * @user_data_free_func: Function to free @user_data with when filter
 * is removed or %NULL.
 *
 * Adds a message filter. Filters are handlers that are run on all
 * incoming messages, prior to standard dispatch. Filters are run in
 * the order that they were added.  The same handler can be added as a
 * filter more than once, in which case it will be run more than once.
 * Filters added during a filter callback won't be run on the message
 * being processed.
 *
 * Note that filters are run in a dedicated message handling thread so
 * they can't block and, generally, can't do anything but signal a
 * worker thread. Also note that filters are rarely needed - use API
 * such as g_dbus_connection_send_message_with_reply(),
 * g_dbus_connection_signal_subscribe() or
 * g_dbus_connection_invoke_method() instead.
 *
 * Returns: A filter identifier that can be used with
 * g_dbus_connection_remove_filter().
2263 2264
 *
 * Since: 2.26
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 */
guint
g_dbus_connection_add_filter (GDBusConnection            *connection,
                              GDBusMessageFilterFunction  filter_function,
                              gpointer                    user_data,
                              GDestroyNotify              user_data_free_func)
{
  FilterData *data;

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
  g_return_val_if_fail (filter_function != NULL, 0);

  CONNECTION_LOCK (connection);
  data = g_new0 (FilterData, 1);
  data->id = _global_filter_id++; /* TODO: overflow etc. */
  data->filter_function = filter_function;
  data->user_data = user_data;
  data->user_data_free_func = user_data_free_func;
  g_ptr_array_add (connection->priv->filters, data);
  CONNECTION_UNLOCK (connection);

  return data->id;
}

/* only called from finalize(), removes all filters */
static void
purge_all_filters (GDBusConnection *connection)
{
  guint n;
  for (n = 0; n < connection->priv->filters->len; n++)
    {
      FilterData *data = connection->priv->filters->pdata[n];
      if (data->user_data_free_func != NULL)
        data->user_data_free_func (data->user_data);
      g_free (data);
    }
}

void
g_dbus_connection_remove_filter (GDBusConnection    *connection,
                                 guint               filter_id)
{
  guint n;
  FilterData *to_destroy;

  g_return_if_fail (G_IS_DBUS_CONNECTION (connection));

  CONNECTION_LOCK (connection);
  to_destroy = NULL;
  for (n = 0; n < connection->priv->filters->len; n++)
    {
      FilterData *data = connection->priv->filters->pdata[n];
      if (data->id == filter_id)
        {
          g_ptr_array_remove_index (connection->priv->filters, n);
          to_destroy = data;
          break;
        }
    }
  CONNECTION_UNLOCK (connection);

  /* do free without holding lock */
  if (to_destroy != NULL)
    {
      if (to_destroy->user_data_free_func != NULL)
        to_destroy->user_data_free_func (to_destroy->user_data);
      g_free (to_destroy);
    }
  else
    {
      g_warning ("g_dbus_connection_remove_filter: No filter found for filter_id %d", filter_id);
    }
}

/* ---------------------------------------------------------------------------------------------------- */

typedef struct
{
  gchar *rule;
  gchar *sender;
  gchar *interface_name;
  gchar *member;
  gchar *object_path;
  gchar *arg0;
  GArray *subscribers;
} SignalData;

typedef struct
{
  GDBusSignalCallback callback;
  gpointer user_data;
  GDestroyNotify user_data_free_func;
  guint id;
  GMainContext *context;
} SignalSubscriber;

static void
signal_data_free (SignalData *data)
{
  g_free (data->rule);
  g_free (data->sender);
  g_free (data->interface_name);
  g_free (data->member);
  g_free (data->object_path);
  g_free (data->arg0);
  g_array_free (data->subscribers, TRUE);
  g_free (data);
}

static gchar *
args_to_rule (const gchar         *sender,
              const gchar         *interface_name,
              const gchar         *member,
              const gchar         *object_path,
              const gchar         *arg0)
{
  GString *rule;

  rule = g_string_new ("type='signal'");
  if (sender != NULL)
    g_string_append_printf (rule, ",sender='%s'", sender);
  if (interface_name != NULL)
    g_string_append_printf (rule, ",interface='%s'", interface_name);
  if (member != NULL)
    g_string_append_printf (rule, ",member='%s'", member);
  if (object_path != NULL)
    g_string_append_printf (rule, ",path='%s'", object_path);
  if (arg0 != NULL)
    g_string_append_printf (rule, ",arg0='%s'", arg0);

  return g_string_free (rule, FALSE);
}

static guint _global_subscriber_id = 1;
static guint _global_registration_id = 1;
static guint _global_subtree_registration_id = 1;

/* ---------------------------------------------------------------------------------------------------- */

/* must hold lock when calling */
static void
add_match_rule (GDBusConnection *connection,
                const gchar     *match_rule)
{
  GError *error;
  GDBusMessage *message;

  message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
                                            "/org/freedesktop/DBus", /* path */
                                            "org.freedesktop.DBus", /* interface */
                                            "AddMatch");
  g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));

  error = NULL;
  if (!g_dbus_connection_send_message_unlocked (connection,
                                                message,
                                                NULL,
                                                &error))
    {
      g_critical ("Error while sending AddMatch() message: %s", error->message);
      g_error_free (error);
    }
  g_object_unref (message);
}

/* ---------------------------------------------------------------------------------------------------- */

/* must hold lock when calling */
static void
remove_match_rule (GDBusConnection *connection,
                   const gchar     *match_rule)
{
  GError *error;
  GDBusMessage *message;

  message = g_dbus_message_new_method_call ("org.freedesktop.DBus", /* name */
                                            "/org/freedesktop/DBus", /* path */
                                            "org.freedesktop.DBus", /* interface */
                                            "RemoveMatch");
  g_dbus_message_set_body (message, g_variant_new ("(s)", match_rule));

  error = NULL;
  if (!g_dbus_connection_send_message_unlocked (connection,
                                                message,
                                                NULL,
                                                &error))
    {
      g_critical ("Error while sending RemoveMatch() message: %s", error->message);
      g_error_free (error);
    }
  g_object_unref (message);
}

/* ---------------------------------------------------------------------------------------------------- */

static gboolean
is_signal_data_for_name_lost_or_acquired (SignalData *signal_data)
{
  return g_strcmp0 (signal_data->sender, "org.freedesktop.DBus") == 0 &&
    g_strcmp0 (signal_data->interface_name, "org.freedesktop.DBus") == 0 &&
    g_strcmp0 (signal_data->object_path, "/org/freedesktop/DBus") == 0 &&
    (g_strcmp0 (signal_data->member, "NameLost") == 0 ||
     g_strcmp0 (signal_data->member, "NameAcquired") == 0);
}

/* ---------------------------------------------------------------------------------------------------- */

/**
 * g_dbus_connection_signal_subscribe:
 * @connection: A #GDBusConnection.
 * @sender: Sender name to match on. Must be either <literal>org.freedesktop.DBus</literal> (for listening to signals from the message bus daemon) or a unique name or %NULL to listen from all senders.
 * @interface_name: D-Bus interface name to match on or %NULL to match on all interfaces.
 * @member: D-Bus signal name to match on or %NULL to match on all signals.
 * @object_path: Object path to match on or %NULL to match on all object paths.
 * @arg0: Contents of first string argument to match on or %NULL to match on all kinds of arguments.
 * @callback: Callback to invoke when there is a signal matching the requested data.
 * @user_data: User data to pass to @callback.
 * @user_data_free_func: Function to free @user_data with when subscription is removed or %NULL.
 *
 * Subscribes to signals on @connection and invokes @callback with a
 * whenever the signal is received. Note that @callback
 * will be invoked in the <link
 * linkend="g-main-context-push-thread-default">thread-default main
 * loop</link> of the thread you are calling this method from.
 *
 * It is considered a programming error to use this function if @connection is closed.
 *
 * Note that if @sender is not <literal>org.freedesktop.DBus</literal> (for listening to signals from the
 * message bus daemon), then it needs to be a unique bus name or %NULL (for listening to signals from any
 * name) - you cannot pass a name like <literal>com.example.MyApp</literal>.
 * Use e.g. g_bus_watch_name() to find the unique name for the owner of the name you are interested in. Also note
 * that this function does not remove a subscription if @sender vanishes from the bus. You have to manually
 * call g_dbus_connection_signal_unsubscribe() to remove a subscription.
 *
 * Returns: A subscription identifier that can be used with g_dbus_connection_signal_unsubscribe().
2500 2501 2502
 *
 * Since: 2.26
 */
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guint
g_dbus_connection_signal_subscribe (GDBusConnection     *connection,
                                    const gchar         *sender,
                                    const gchar         *interface_name,
                                    const gchar         *member,
                                    const gchar         *object_path,
                                    const gchar         *arg0,
                                    GDBusSignalCallback  callback,
                                    gpointer             user_data,
                                    GDestroyNotify       user_data_free_func)
{
  gchar *rule;
  SignalData *signal_data;
  SignalSubscriber subscriber;
  GPtrArray *signal_data_array;

  /* Right now we abort if AddMatch() fails since it can only fail with the bus being in
   * an OOM condition. We might want to change that but that would involve making
   * g_dbus_connection_signal_subscribe() asynchronous and having the call sites
   * handle that. And there's really no sensible way of handling this short of retrying
   * to add the match rule... and then there's the little thing that, hey, maybe there's
   * a reason the bus in an OOM condition.
   *
   * Doable, but not really sure it's worth it...
   */

  g_return_val_if_fail (G_IS_DBUS_CONNECTION (connection), 0);
  g_return_val_if_fail (!g_dbus_connection_is_closed (connection), 0);
  g_return_val_if_fail (sender == NULL || ((strcmp (sender, "org.freedesktop.DBus") == 0 || sender[0] == ':') &&
                                           (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)), 0);
  g_return_val_if_fail (interface_name == NULL || g_dbus_is_interface_name (interface_name), 0);
  g_return_val_if_fail (member == NULL || g_dbus_is_member_name (member), 0);
  g_return_val_if_fail (object_path == NULL || g_variant_is_object_path (object_path), 0);
  g_return_val_if_fail (callback != NULL, 0);

  CONNECTION_LOCK (connection);

  rule = args_to_rule (sender, interface_name, member, object_path, arg0);

  if (sender == NULL)
    sender = "";

  subscriber.callback = callback;
  subscriber.user_data = user_data;
  subscriber.user_data_free_func = user_data_free_func;
  subscriber.id = _global_subscriber_id++; /* TODO: overflow etc. */
  subscriber.context = g_main_context_get_thread_default ();
  if (subscriber.context != NULL)
    g_main_context_ref (subscriber.context);

  /* see if we've already have this rule */
  signal_data = g_hash_table_lookup (connection->priv->map_rule_to_signal_data, rule);
  if (signal_data != NULL)
    {
      g_array_append_val (signal_data->subscribers, subscriber);
      g_free (rule);
      goto out;
    }

  signal_data = g_new0 (SignalData, 1);
  signal_data->rule           = rule;
  signal_data->sender         = g_strdup (sender);
  signal_data->interface_name = g_strdup (interface_name);
  signal_data->member         = g_strdup (member);
  signal_data->object_path    = g_strdup (object_path);
  signal_data->arg0           = g_strdup (arg0);
  signal_data->subscribers    = g_array_new (FALSE, FALSE, sizeof (SignalSubscriber));
  g_array_append_val (signal_data->subscribers, subscriber);

  g_hash_table_insert (connection->priv->map_rule_to_signal_data,
                       signal_data->rule,
                       signal_data);

  /* Add the match rule to the bus...
   *
   * Avoid adding match rules for NameLost and NameAcquired messages - the bus will
   * always send such messages to to us.
   */
  if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
    {
      if (!is_signal_data_for_name_lost_or_acquired (signal_data))
        {
          add_match_rule (connection, signal_data->rule);
        }
    }

 out:
  g_hash_table_insert (connection->priv->map_id_to_signal_data,
                       GUINT_TO_POINTER (subscriber.id),
                       signal_data);

  signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
                                           signal_data->sender);
  if (signal_data_array == NULL)
    {
      signal_data_array = g_ptr_array_new ();
      g_hash_table_insert (connection->priv->map_sender_to_signal_data_array,
                           g_strdup (signal_data->sender),
                           signal_data_array);
    }
  g_ptr_array_add (signal_data_array, signal_data);

  CONNECTION_UNLOCK (connection);

  return subscriber.id;
}

/* ---------------------------------------------------------------------------------------------------- */

/* must hold lock when calling this */
static void
unsubscribe_id_internal (GDBusConnection    *connection,
                         guint               subscription_id,
                         GArray             *out_removed_subscribers)
{
  SignalData *signal_data;
  GPtrArray *signal_data_array;
  guint n;

  signal_data = g_hash_table_lookup (connection->priv->map_id_to_signal_data,
                                     GUINT_TO_POINTER (subscription_id));
  if (signal_data == NULL)
    {
      /* Don't warn here, we may have thrown all subscriptions out when the connection was closed */
      goto out;
    }

  for (n = 0; n < signal_data->subscribers->len; n++)
    {
      SignalSubscriber *subscriber;

      subscriber = &(g_array_index (signal_data->subscribers, SignalSubscriber, n));
      if (subscriber->id != subscription_id)
        continue;

      g_warn_if_fail (g_hash_table_remove (connection->priv->map_id_to_signal_data,
                                           GUINT_TO_POINTER (subscription_id)));
      g_array_append_val (out_removed_subscribers, *subscriber);
      g_array_remove_index (signal_data->subscribers, n);

      if (signal_data->subscribers->len == 0)
        g_warn_if_fail (g_hash_table_remove (connection->priv->map_rule_to_signal_data, signal_data->rule));

      signal_data_array = g_hash_table_lookup (connection->priv->map_sender_to_signal_data_array,
                                               signal_data->sender);
      g_warn_if_fail (signal_data_array != NULL);
      g_warn_if_fail (g_ptr_array_remove (signal_data_array, signal_data));

      if (signal_data_array->len == 0)
        {
          g_warn_if_fail (g_hash_table_remove (connection->priv->map_sender_to_signal_data_array, signal_data->sender));

          /* remove the match rule from the bus unless NameLost or NameAcquired (see subscribe()) */
          if (connection->priv->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION)
            {
              if (!is_signal_data_for_name_lost_or_acquired (signal_data))
                {
                  remove_match_rule (connection, signal_data->rule);
                }
            }

          signal_data_free (signal_data);
        }

      goto out;
    }

  g_assert_not_reached ();

 out:
  ;
}

/**
 * g_dbus_connection_signal_unsubscribe:
 * @connection: A #GDBusConnection.
 * @subscription_id: A subscription id obtained from g_dbus_connection_signal_subscribe().
 *
 * Unsubscribes from signals.
2682 2683 2684
 *
 * Since: 2.26
 */
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