gdbusaddress.c 45.6 KB
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/* GDBus - GLib D-Bus Library
 *
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 * Copyright (C) 2008-2010 Red Hat, Inc.
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 *
 * 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>
 */

#include "config.h"

#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
#include <errno.h>
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#include "gioerror.h"
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#include "gdbusutils.h"
#include "gdbusaddress.h"
#include "gdbuserror.h"
#include "gioenumtypes.h"
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#include "gnetworkaddress.h"
#include "gsocketclient.h"
#include "giostream.h"
#include "gasyncresult.h"
#include "gsimpleasyncresult.h"
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#include "glib-private.h"
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#include "gdbusprivate.h"
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#include "giomodule-priv.h"
#include "gdbusdaemon.h"
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#ifdef G_OS_UNIX
#include <gio/gunixsocketaddress.h>
#endif

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#ifdef G_OS_WIN32
#include <windows.h>
#include <io.h>
#include <conio.h>
#endif

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#include "glibintl.h"

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/**
 * SECTION:gdbusaddress
 * @title: D-Bus Addresses
 * @short_description: D-Bus connection endpoints
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 * @include: gio/gio.h
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 *
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 * Routines for working with D-Bus addresses. A D-Bus address is a string
 * like "unix:tmpdir=/tmp/my-app-name". The exact format of addresses
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 * is explained in detail in the <link linkend="http://dbus.freedesktop.org/doc/dbus-specification.html&num;addresses">D-Bus specification</link>.
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 */

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static gchar *get_session_address_platform_specific (GError **error);

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

/**
 * g_dbus_is_address:
 * @string: A string.
 *
 * Checks if @string is a D-Bus address.
 *
 * This doesn't check if @string is actually supported by #GDBusServer
 * or #GDBusConnection - use g_dbus_is_supported_address() to do more
 * checks.
 *
 * Returns: %TRUE if @string is a valid D-Bus address, %FALSE otherwise.
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 *
 * Since: 2.26
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 */
gboolean
g_dbus_is_address (const gchar *string)
{
  guint n;
  gchar **a;
  gboolean ret;

  ret = FALSE;

  g_return_val_if_fail (string != NULL, FALSE);

  a = g_strsplit (string, ";", 0);
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  if (a[0] == NULL)
    goto out;

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  for (n = 0; a[n] != NULL; n++)
    {
      if (!_g_dbus_address_parse_entry (a[n],
                                        NULL,
                                        NULL,
                                        NULL))
        goto out;
    }

  ret = TRUE;

 out:
  g_strfreev (a);
  return ret;
}

static gboolean
is_valid_unix (const gchar  *address_entry,
               GHashTable   *key_value_pairs,
               GError      **error)
{
  gboolean ret;
  GList *keys;
  GList *l;
  const gchar *path;
  const gchar *tmpdir;
  const gchar *abstract;

  ret = FALSE;
  keys = NULL;
  path = NULL;
  tmpdir = NULL;
  abstract = NULL;

  keys = g_hash_table_get_keys (key_value_pairs);
  for (l = keys; l != NULL; l = l->next)
    {
      const gchar *key = l->data;
      if (g_strcmp0 (key, "path") == 0)
        path = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "tmpdir") == 0)
        tmpdir = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "abstract") == 0)
        abstract = g_hash_table_lookup (key_value_pairs, key);
      else
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Unsupported key '%s' in address entry '%s'"),
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                       key,
                       address_entry);
          goto out;
        }
    }

  if (path != NULL)
    {
      if (tmpdir != NULL || abstract != NULL)
        goto meaningless;
    }
  else if (tmpdir != NULL)
    {
      if (path != NULL || abstract != NULL)
        goto meaningless;
    }
  else if (abstract != NULL)
    {
      if (path != NULL || tmpdir != NULL)
        goto meaningless;
    }
  else
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
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                   _("Address '%s' is invalid (need exactly one of path, tmpdir or abstract keys)"),
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                   address_entry);
      goto out;
    }


  ret= TRUE;
  goto out;

 meaningless:
  g_set_error (error,
               G_IO_ERROR,
               G_IO_ERROR_INVALID_ARGUMENT,
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               _("Meaningless key/value pair combination in address entry '%s'"),
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               address_entry);

 out:
  g_list_free (keys);

  return ret;
}

static gboolean
is_valid_nonce_tcp (const gchar  *address_entry,
                    GHashTable   *key_value_pairs,
                    GError      **error)
{
  gboolean ret;
  GList *keys;
  GList *l;
  const gchar *host;
  const gchar *port;
  const gchar *family;
  const gchar *nonce_file;
  gint port_num;
  gchar *endp;

  ret = FALSE;
  keys = NULL;
  host = NULL;
  port = NULL;
  family = NULL;
  nonce_file = NULL;

  keys = g_hash_table_get_keys (key_value_pairs);
  for (l = keys; l != NULL; l = l->next)
    {
      const gchar *key = l->data;
      if (g_strcmp0 (key, "host") == 0)
        host = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "port") == 0)
        port = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "family") == 0)
        family = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "noncefile") == 0)
        nonce_file = g_hash_table_lookup (key_value_pairs, key);
      else
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Unsupported key '%s' in address entry '%s'"),
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                       key,
                       address_entry);
          goto out;
        }
    }

  if (port != NULL)
    {
      port_num = strtol (port, &endp, 10);
      if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error in address '%s' - the port attribute is malformed"),
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                       address_entry);
          goto out;
        }
    }

  if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
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                   _("Error in address '%s' - the family attribute is malformed"),
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                   address_entry);
      goto out;
    }

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  if (host != NULL)
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    {
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      /* TODO: validate host */
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    }

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  nonce_file = nonce_file; /* To avoid -Wunused-but-set-variable */

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  ret= TRUE;

 out:
  g_list_free (keys);

  return ret;
}

static gboolean
is_valid_tcp (const gchar  *address_entry,
              GHashTable   *key_value_pairs,
              GError      **error)
{
  gboolean ret;
  GList *keys;
  GList *l;
  const gchar *host;
  const gchar *port;
  const gchar *family;
  gint port_num;
  gchar *endp;

  ret = FALSE;
  keys = NULL;
  host = NULL;
  port = NULL;
  family = NULL;

  keys = g_hash_table_get_keys (key_value_pairs);
  for (l = keys; l != NULL; l = l->next)
    {
      const gchar *key = l->data;
      if (g_strcmp0 (key, "host") == 0)
        host = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "port") == 0)
        port = g_hash_table_lookup (key_value_pairs, key);
      else if (g_strcmp0 (key, "family") == 0)
        family = g_hash_table_lookup (key_value_pairs, key);
      else
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Unsupported key '%s' in address entry '%s'"),
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                       key,
                       address_entry);
          goto out;
        }
    }

  if (port != NULL)
    {
      port_num = strtol (port, &endp, 10);
      if ((*port == '\0' || *endp != '\0') || port_num < 0 || port_num >= 65536)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error in address '%s' - the port attribute is malformed"),
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                       address_entry);
          goto out;
        }
    }

  if (family != NULL && !(g_strcmp0 (family, "ipv4") == 0 || g_strcmp0 (family, "ipv6") == 0))
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
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                   _("Error in address '%s' - the family attribute is malformed"),
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                   address_entry);
      goto out;
    }

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  if (host != NULL)
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    {
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      /* TODO: validate host */
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    }

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  ret= TRUE;

 out:
  g_list_free (keys);

  return ret;
}

/**
 * g_dbus_is_supported_address:
 * @string: A string.
 * @error: Return location for error or %NULL.
 *
 * Like g_dbus_is_address() but also checks if the library suppors the
 * transports in @string and that key/value pairs for each transport
 * are valid.
 *
 * Returns: %TRUE if @string is a valid D-Bus address that is
 * supported by this library, %FALSE if @error is set.
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 *
 * Since: 2.26
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 */
gboolean
g_dbus_is_supported_address (const gchar  *string,
                             GError      **error)
{
  guint n;
  gchar **a;
  gboolean ret;

  ret = FALSE;

  g_return_val_if_fail (string != NULL, FALSE);
  g_return_val_if_fail (error == NULL || *error == NULL, FALSE);

  a = g_strsplit (string, ";", 0);
  for (n = 0; a[n] != NULL; n++)
    {
      gchar *transport_name;
      GHashTable *key_value_pairs;
      gboolean supported;

      if (!_g_dbus_address_parse_entry (a[n],
                                        &transport_name,
                                        &key_value_pairs,
                                        error))
        goto out;

      supported = FALSE;
      if (g_strcmp0 (transport_name, "unix") == 0)
        supported = is_valid_unix (a[n], key_value_pairs, error);
      else if (g_strcmp0 (transport_name, "tcp") == 0)
        supported = is_valid_tcp (a[n], key_value_pairs, error);
      else if (g_strcmp0 (transport_name, "nonce-tcp") == 0)
        supported = is_valid_nonce_tcp (a[n], key_value_pairs, error);
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      else if (g_strcmp0 (a[n], "autolaunch:") == 0)
        supported = TRUE;
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      g_free (transport_name);
      g_hash_table_unref (key_value_pairs);

      if (!supported)
        goto out;
    }

  ret = TRUE;

 out:
  g_strfreev (a);

  g_assert (ret || (!ret && (error == NULL || *error != NULL)));

  return ret;
}

gboolean
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_g_dbus_address_parse_entry (const gchar  *address_entry,
                             gchar       **out_transport_name,
                             GHashTable  **out_key_value_pairs,
                             GError      **error)
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{
  gboolean ret;
  GHashTable *key_value_pairs;
  gchar *transport_name;
  gchar **kv_pairs;
  const gchar *s;
  guint n;

  ret = FALSE;
  kv_pairs = NULL;
  transport_name = NULL;
  key_value_pairs = NULL;

  s = strchr (address_entry, ':');
  if (s == NULL)
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
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                   _("Address element '%s' does not contain a colon (:)"),
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                   address_entry);
      goto out;
    }

  transport_name = g_strndup (address_entry, s - address_entry);
  key_value_pairs = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_free);

  kv_pairs = g_strsplit (s + 1, ",", 0);
  for (n = 0; kv_pairs != NULL && kv_pairs[n] != NULL; n++)
    {
      const gchar *kv_pair = kv_pairs[n];
      gchar *key;
      gchar *value;

      s = strchr (kv_pair, '=');
      if (s == NULL)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Key/Value pair %d, '%s', in address element '%s' does not contain an equal sign"),
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                       n,
                       kv_pair,
                       address_entry);
          goto out;
        }

      key = g_uri_unescape_segment (kv_pair, s, NULL);
      value = g_uri_unescape_segment (s + 1, kv_pair + strlen (kv_pair), NULL);
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      if (key == NULL || value == NULL)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error unescaping key or value in Key/Value pair %d, '%s', in address element '%s'"),
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                       n,
                       kv_pair,
                       address_entry);
          g_free (key);
          g_free (value);
          goto out;
        }
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      g_hash_table_insert (key_value_pairs, key, value);
    }

  ret = TRUE;

out:
  g_strfreev (kv_pairs);
  if (ret)
    {
      if (out_transport_name != NULL)
        *out_transport_name = transport_name;
      else
        g_free (transport_name);
      if (out_key_value_pairs != NULL)
        *out_key_value_pairs = key_value_pairs;
      else if (key_value_pairs != NULL)
        g_hash_table_unref (key_value_pairs);
    }
  else
    {
      g_free (transport_name);
      if (key_value_pairs != NULL)
        g_hash_table_unref (key_value_pairs);
    }
  return ret;
}

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

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static GIOStream *
g_dbus_address_try_connect_one (const gchar   *address_entry,
                                gchar        **out_guid,
                                GCancellable  *cancellable,
                                GError       **error);

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/* TODO: Declare an extension point called GDBusTransport (or similar)
 * and move code below to extensions implementing said extension
 * point. That way we can implement a D-Bus transport over X11 without
 * making libgio link to libX11...
 */
static GIOStream *
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g_dbus_address_connect (const gchar   *address_entry,
                        const gchar   *transport_name,
                        GHashTable    *key_value_pairs,
                        GCancellable  *cancellable,
                        GError       **error)
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{
  GIOStream *ret;
  GSocketConnectable *connectable;
  const gchar *nonce_file;

  connectable = NULL;
  ret = NULL;
  nonce_file = NULL;

  if (FALSE)
    {
    }
#ifdef G_OS_UNIX
  else if (g_strcmp0 (transport_name, "unix") == 0)
    {
      const gchar *path;
      const gchar *abstract;
      path = g_hash_table_lookup (key_value_pairs, "path");
      abstract = g_hash_table_lookup (key_value_pairs, "abstract");
      if ((path == NULL && abstract == NULL) || (path != NULL && abstract != NULL))
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error in address '%s' - the unix transport requires exactly one of the "
                         "keys 'path' or 'abstract' to be set"),
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                       address_entry);
        }
      else if (path != NULL)
        {
          connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new (path));
        }
      else if (abstract != NULL)
        {
          connectable = G_SOCKET_CONNECTABLE (g_unix_socket_address_new_with_type (abstract,
                                                                                   -1,
                                                                                   G_UNIX_SOCKET_ADDRESS_ABSTRACT));
        }
      else
        {
          g_assert_not_reached ();
        }
    }
#endif
  else if (g_strcmp0 (transport_name, "tcp") == 0 || g_strcmp0 (transport_name, "nonce-tcp") == 0)
    {
      const gchar *s;
      const gchar *host;
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      glong port;
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      gchar *endp;
      gboolean is_nonce;

      is_nonce = (g_strcmp0 (transport_name, "nonce-tcp") == 0);

      host = g_hash_table_lookup (key_value_pairs, "host");
      if (host == NULL)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error in address '%s' - the host attribute is missing or malformed"),
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                       address_entry);
          goto out;
        }

      s = g_hash_table_lookup (key_value_pairs, "port");
      if (s == NULL)
        s = "0";
      port = strtol (s, &endp, 10);
      if ((*s == '\0' || *endp != '\0') || port < 0 || port >= 65536)
        {
          g_set_error (error,
                       G_IO_ERROR,
                       G_IO_ERROR_INVALID_ARGUMENT,
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                       _("Error in address '%s' - the port attribute is missing or malformed"),
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                       address_entry);
          goto out;
        }


      if (is_nonce)
        {
          nonce_file = g_hash_table_lookup (key_value_pairs, "noncefile");
          if (nonce_file == NULL)
            {
              g_set_error (error,
                           G_IO_ERROR,
                           G_IO_ERROR_INVALID_ARGUMENT,
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                           _("Error in address '%s' - the noncefile attribute is missing or malformed"),
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                           address_entry);
              goto out;
            }
        }

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      /* TODO: deal with family key/value-pair */
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      connectable = g_network_address_new (host, port);
    }
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  else if (g_strcmp0 (address_entry, "autolaunch:") == 0)
    {
      gchar *autolaunch_address;
      autolaunch_address = get_session_address_platform_specific (error);
      if (autolaunch_address != NULL)
        {
          ret = g_dbus_address_try_connect_one (autolaunch_address, NULL, cancellable, error);
          g_free (autolaunch_address);
          goto out;
        }
      else
        {
          g_prefix_error (error, _("Error auto-launching: "));
        }
    }
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  else
    {
      g_set_error (error,
                   G_IO_ERROR,
                   G_IO_ERROR_INVALID_ARGUMENT,
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                   _("Unknown or unsupported transport '%s' for address '%s'"),
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                   transport_name,
                   address_entry);
    }

  if (connectable != NULL)
    {
      GSocketClient *client;
      GSocketConnection *connection;

      g_assert (ret == NULL);
      client = g_socket_client_new ();
      connection = g_socket_client_connect (client,
                                            connectable,
                                            cancellable,
                                            error);
      g_object_unref (connectable);
      g_object_unref (client);
      if (connection == NULL)
        goto out;

      ret = G_IO_STREAM (connection);

      if (nonce_file != NULL)
        {
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          gchar nonce_contents[16 + 1];
          size_t num_bytes_read;
          FILE *f;
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          /* be careful to read only 16 bytes - we also check that the file is only 16 bytes long */
          f = fopen (nonce_file, "rb");
          if (f == NULL)
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            {
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              g_set_error (error,
                           G_IO_ERROR,
                           G_IO_ERROR_INVALID_ARGUMENT,
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                           _("Error opening nonce file '%s': %s"),
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                           nonce_file,
                           g_strerror (errno));
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              g_object_unref (ret);
              ret = NULL;
              goto out;
            }
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          num_bytes_read = fread (nonce_contents,
                                  sizeof (gchar),
                                  16 + 1,
                                  f);
          if (num_bytes_read != 16)
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            {
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              if (num_bytes_read == 0)
                {
                  g_set_error (error,
                               G_IO_ERROR,
                               G_IO_ERROR_INVALID_ARGUMENT,
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                               _("Error reading from nonce file '%s': %s"),
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                               nonce_file,
                               g_strerror (errno));
                }
              else
                {
                  g_set_error (error,
                               G_IO_ERROR,
                               G_IO_ERROR_INVALID_ARGUMENT,
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                               _("Error reading from nonce file '%s', expected 16 bytes, got %d"),
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                               nonce_file,
                               (gint) num_bytes_read);
                }
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              g_object_unref (ret);
              ret = NULL;
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              fclose (f);
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              goto out;
            }
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          fclose (f);
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          if (!g_output_stream_write_all (g_io_stream_get_output_stream (ret),
                                          nonce_contents,
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                                          16,
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                                          NULL,
                                          cancellable,
                                          error))
            {
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              g_prefix_error (error, _("Error writing contents of nonce file '%s' to stream:"), nonce_file);
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              g_object_unref (ret);
              ret = NULL;
              goto out;
            }
        }
    }

 out:

  return ret;
}

static GIOStream *
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g_dbus_address_try_connect_one (const gchar   *address_entry,
                                gchar        **out_guid,
                                GCancellable  *cancellable,
                                GError       **error)
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{
  GIOStream *ret;
  GHashTable *key_value_pairs;
  gchar *transport_name;
  const gchar *guid;

  ret = NULL;
  transport_name = NULL;
  key_value_pairs = NULL;

  if (!_g_dbus_address_parse_entry (address_entry,
                                    &transport_name,
                                    &key_value_pairs,
                                    error))
    goto out;

  ret = g_dbus_address_connect (address_entry,
                                transport_name,
                                key_value_pairs,
                                cancellable,
                                error);
  if (ret == NULL)
    goto out;

  guid = g_hash_table_lookup (key_value_pairs, "guid");
  if (guid != NULL && out_guid != NULL)
    *out_guid = g_strdup (guid);

out:
  g_free (transport_name);
  if (key_value_pairs != NULL)
    g_hash_table_unref (key_value_pairs);
  return ret;
}


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

typedef struct {
  gchar *address;
  GIOStream *stream;
  gchar *guid;
} GetStreamData;

static void
get_stream_data_free (GetStreamData *data)
{
  g_free (data->address);
  if (data->stream != NULL)
    g_object_unref (data->stream);
  g_free (data->guid);
  g_free (data);
}

static void
get_stream_thread_func (GSimpleAsyncResult *res,
                        GObject            *object,
                        GCancellable       *cancellable)
{
  GetStreamData *data;
  GError *error;

  data = g_simple_async_result_get_op_res_gpointer (res);

  error = NULL;
  data->stream = g_dbus_address_get_stream_sync (data->address,
                                                 &data->guid,
                                                 cancellable,
                                                 &error);
  if (data->stream == NULL)
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    g_simple_async_result_take_error (res, error);
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}

/**
 * g_dbus_address_get_stream:
 * @address: A valid D-Bus address.
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 * @cancellable: (allow-none): A #GCancellable or %NULL.
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 * @callback: A #GAsyncReadyCallback to call when the request is satisfied.
 * @user_data: Data to pass to @callback.
 *
 * Asynchronously connects to an endpoint specified by @address and
 * sets up the connection so it is in a state to run the client-side
 * of the D-Bus authentication conversation.
 *
 * When the operation is finished, @callback will be invoked. You can
 * then call g_dbus_address_get_stream_finish() to get the result of
 * the operation.
 *
 * This is an asynchronous failable function. See
 * g_dbus_address_get_stream_sync() for the synchronous version.
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 *
 * Since: 2.26
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 */
void
g_dbus_address_get_stream (const gchar         *address,
                           GCancellable        *cancellable,
                           GAsyncReadyCallback  callback,
                           gpointer             user_data)
{
  GSimpleAsyncResult *res;
  GetStreamData *data;

  g_return_if_fail (address != NULL);

  res = g_simple_async_result_new (NULL,
                                   callback,
                                   user_data,
                                   g_dbus_address_get_stream);
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  g_simple_async_result_set_check_cancellable (res, cancellable);
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  data = g_new0 (GetStreamData, 1);
  data->address = g_strdup (address);
  g_simple_async_result_set_op_res_gpointer (res,
                                             data,
                                             (GDestroyNotify) get_stream_data_free);
  g_simple_async_result_run_in_thread (res,
                                       get_stream_thread_func,
                                       G_PRIORITY_DEFAULT,
                                       cancellable);
  g_object_unref (res);
}

/**
 * g_dbus_address_get_stream_finish:
 * @res: A #GAsyncResult obtained from the GAsyncReadyCallback passed to g_dbus_address_get_stream().
 * @out_guid: %NULL or return location to store the GUID extracted from @address, if any.
 * @error: Return location for error or %NULL.
 *
 * Finishes an operation started with g_dbus_address_get_stream().
 *
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 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
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 *
 * Since: 2.26
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 */
GIOStream *
g_dbus_address_get_stream_finish (GAsyncResult        *res,
                                  gchar              **out_guid,
                                  GError             **error)
{
  GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (res);
  GetStreamData *data;
  GIOStream *ret;

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

  g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_dbus_address_get_stream);

  ret = NULL;

  data = g_simple_async_result_get_op_res_gpointer (simple);
  if (g_simple_async_result_propagate_error (simple, error))
    goto out;

  ret = g_object_ref (data->stream);
  if (out_guid != NULL)
    *out_guid = g_strdup (data->guid);

 out:
  return ret;
}

/**
 * g_dbus_address_get_stream_sync:
 * @address: A valid D-Bus address.
 * @out_guid: %NULL or return location to store the GUID extracted from @address, if any.
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 * @cancellable: (allow-none): A #GCancellable or %NULL.
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 * @error: Return location for error or %NULL.
 *
 * Synchronously connects to an endpoint specified by @address and
 * sets up the connection so it is in a state to run the client-side
 * of the D-Bus authentication conversation.
 *
 * This is a synchronous failable function. See
 * g_dbus_address_get_stream() for the asynchronous version.
 *
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 * Returns: (transfer full): A #GIOStream or %NULL if @error is set.
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 *
 * Since: 2.26
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 */
GIOStream *
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g_dbus_address_get_stream_sync (const gchar   *address,
                                gchar        **out_guid,
                                GCancellable  *cancellable,
                                GError       **error)
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{
  GIOStream *ret;
  gchar **addr_array;
  guint n;
  GError *last_error;

  g_return_val_if_fail (address != NULL, NULL);
  g_return_val_if_fail (error == NULL || *error == NULL, NULL);

  ret = NULL;
  last_error = NULL;

  addr_array = g_strsplit (address, ";", 0);
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  if (addr_array != NULL && addr_array[0] == NULL)
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    {
      last_error = g_error_new_literal (G_IO_ERROR,
                                        G_IO_ERROR_INVALID_ARGUMENT,
                                        _("The given address is empty"));
      goto out;
    }

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  for (n = 0; addr_array != NULL && addr_array[n] != NULL; n++)
    {
      const gchar *addr = addr_array[n];
      GError *this_error;
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      this_error = NULL;
      ret = g_dbus_address_try_connect_one (addr,
                                            out_guid,
                                            cancellable,
                                            &this_error);
      if (ret != NULL)
        {
          goto out;
        }
      else
        {
          g_assert (this_error != NULL);
          if (last_error != NULL)
            g_error_free (last_error);
          last_error = this_error;
        }
    }

 out:
  if (ret != NULL)
    {
      if (last_error != NULL)
        g_error_free (last_error);
    }
  else
    {
      g_assert (last_error != NULL);
      g_propagate_error (error, last_error);
    }
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  g_strfreev (addr_array);
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  return ret;
}

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

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#ifdef G_OS_UNIX
static gchar *
get_session_address_dbus_launch (GError **error)
{
  gchar *ret;
  gchar *machine_id;
  gchar *command_line;
  gchar *launch_stdout;
  gchar *launch_stderr;
  gint exit_status;
  gchar *old_dbus_verbose;
  gboolean restore_dbus_verbose;

  ret = NULL;
  machine_id = NULL;
  command_line = NULL;
  launch_stdout = NULL;
  launch_stderr = NULL;
  restore_dbus_verbose = FALSE;
  old_dbus_verbose = NULL;

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  /* Don't run binaries as root if we're setuid. */
  if (GLIB_PRIVATE_CALL (g_check_setuid) ())
    {
      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED,
		   _("Cannot spawn a message bus when setuid"));
      goto out;
    }

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  machine_id = _g_dbus_get_machine_id (error);
  if (machine_id == NULL)
    {
      g_prefix_error (error, _("Cannot spawn a message bus without a machine-id: "));
      goto out;
    }

  /* We're using private libdbus facilities here. When everything
   * (X11, Mac OS X, Windows) is spec'ed out correctly (not even the
   * X11 property is correctly documented right now) we should
   * consider using the spec instead of dbus-launch.
   *
   *   --autolaunch=MACHINEID
   *          This option implies that dbus-launch should scan  for  a  previ‐
   *          ously-started  session  and  reuse the values found there. If no
   *          session is found, it will start a new session. The  --exit-with-
   *          session option is implied if --autolaunch is given.  This option
   *          is for the exclusive use of libdbus, you do not want to  use  it
   *          manually. It may change in the future.
   */

  /* TODO: maybe provide a variable for where to look for the dbus-launch binary? */
  command_line = g_strdup_printf ("dbus-launch --autolaunch=%s --binary-syntax --close-stderr", machine_id);

  if (G_UNLIKELY (_g_dbus_debug_address ()))
    {
      _g_dbus_debug_print_lock ();
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      g_print ("GDBus-debug:Address: Running '%s' to get bus address (possibly autolaunching)\n", command_line);
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      old_dbus_verbose = g_strdup (g_getenv ("DBUS_VERBOSE"));
      restore_dbus_verbose = TRUE;
      g_setenv ("DBUS_VERBOSE", "1", TRUE);
      _g_dbus_debug_print_unlock ();
    }

  if (!g_spawn_command_line_sync (command_line,
                                  &launch_stdout,
                                  &launch_stderr,
                                  &exit_status,
                                  error))
    {
      goto out;
    }

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  if (!g_spawn_check_exit_status (exit_status, error))
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    {
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      g_prefix_error (error, _("Error spawning command line '%s': "), command_line);
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      goto out;
    }

  /* From the dbus-launch(1) man page:
   *
   *   --binary-syntax Write to stdout a nul-terminated bus address,
   *   then the bus PID as a binary integer of size sizeof(pid_t),
   *   then the bus X window ID as a binary integer of size
   *   sizeof(long).  Integers are in the machine's byte order, not
   *   network byte order or any other canonical byte order.
   */
  ret = g_strdup (launch_stdout);

 out:
  if (G_UNLIKELY (_g_dbus_debug_address ()))
    {
      gchar *s;
      _g_dbus_debug_print_lock ();
      g_print ("GDBus-debug:Address: dbus-launch output:");
      if (launch_stdout != NULL)
        {
          s = _g_dbus_hexdump (launch_stdout, strlen (launch_stdout) + 1 + sizeof (pid_t) + sizeof (long), 2);
          g_print ("\n%s", s);
          g_free (s);
        }
      else
        {
          g_print (" (none)\n");
        }
      g_print ("GDBus-debug:Address: dbus-launch stderr output:");
      if (launch_stderr != NULL)
        g_print ("\n%s", launch_stderr);
      else
        g_print (" (none)\n");
      _g_dbus_debug_print_unlock ();
    }

  g_free (machine_id);
  g_free (command_line);
  g_free (launch_stdout);
  g_free (launch_stderr);
  if (G_UNLIKELY (restore_dbus_verbose))
    {
      if (old_dbus_verbose != NULL)
        g_setenv ("DBUS_VERBOSE", old_dbus_verbose, TRUE);
      else
        g_unsetenv ("DBUS_VERBOSE");
    }
  g_free (old_dbus_verbose);
  return ret;
}
#endif

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#ifdef G_OS_WIN32

#define DBUS_DAEMON_ADDRESS_INFO "DBusDaemonAddressInfo"
#define DBUS_DAEMON_MUTEX "DBusDaemonMutex"
#define UNIQUE_DBUS_INIT_MUTEX "UniqueDBusInitMutex"
#define DBUS_AUTOLAUNCH_MUTEX "DBusAutolaunchMutex"

static void
release_mutex (HANDLE mutex)
{
  ReleaseMutex (mutex);
  CloseHandle (mutex);
}

static HANDLE
acquire_mutex (const char *mutexname)
{
  HANDLE mutex;
  DWORD res;

  mutex = CreateMutexA (NULL, FALSE, mutexname);
  if (!mutex)
    return 0;

  res = WaitForSingleObject (mutex, INFINITE);
  switch (res)
    {
    case WAIT_ABANDONED:
      release_mutex (mutex);
      return 0;
    case WAIT_FAILED:
    case WAIT_TIMEOUT:
      return 0;
    }

  return mutex;
}

static gboolean
is_mutex_owned (const char *mutexname)
{
  HANDLE mutex;
  gboolean res = FALSE;

  mutex = CreateMutexA (NULL, FALSE, mutexname);
  if (WaitForSingleObject (mutex, 10) == WAIT_TIMEOUT)
    res = TRUE;
  else
    ReleaseMutex (mutex);
  CloseHandle (mutex);

  return res;
}

static char *
read_shm (const char *shm_name)
{
  HANDLE shared_mem;
  char *shared_data;
  char *res;
  int i;

  res = NULL;

  for (i = 0; i < 20; i++)
    {
      shared_mem = OpenFileMappingA (FILE_MAP_READ, FALSE, shm_name);
      if (shared_mem != 0)
	break;
      Sleep (100);
    }

  if (shared_mem != 0)
    {
      shared_data = MapViewOfFile (shared_mem, FILE_MAP_READ, 0, 0, 0);
      if (shared_data != NULL)
	{
	  res = g_strdup (shared_data);
	  UnmapViewOfFile (shared_data);
	}
      CloseHandle (shared_mem);
    }

  return res;
}

static HANDLE
set_shm (const char *shm_name, const char *value)
{
  HANDLE shared_mem;
  char *shared_data;

  shared_mem = CreateFileMappingA (INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
				   0, strlen (value) + 1, shm_name);
  if (shared_mem == 0)
    return 0;

  shared_data = MapViewOfFile (shared_mem, FILE_MAP_WRITE, 0, 0, 0 );
  if (shared_data == NULL)
    return 0;

  strcpy (shared_data, value);

  UnmapViewOfFile (shared_data);

  return shared_mem;
}

/* These keep state between publish_session_bus and unpublish_session_bus */
static HANDLE published_daemon_mutex;
static HANDLE published_shared_mem;

static gboolean
publish_session_bus (const char *address)
{
  HANDLE init_mutex;

  init_mutex = acquire_mutex (UNIQUE_DBUS_INIT_MUTEX);

  published_daemon_mutex = CreateMutexA (NULL, FALSE, DBUS_DAEMON_MUTEX);
  if (WaitForSingleObject (published_daemon_mutex, 10 ) != WAIT_OBJECT_0)
    {
      release_mutex (init_mutex);
      CloseHandle (published_daemon_mutex);
      published_daemon_mutex = NULL;
      return FALSE;
    }

  published_shared_mem = set_shm (DBUS_DAEMON_ADDRESS_INFO, address);
  if (!published_shared_mem)
    {
      release_mutex (init_mutex);
      CloseHandle (published_daemon_mutex);
      published_daemon_mutex = NULL;
      return FALSE;
    }

  release_mutex (init_mutex);
  return TRUE;
}

static void
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unpublish_session_bus (void)
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{
  HANDLE init_mutex;

  init_mutex = acquire_mutex (UNIQUE_DBUS_INIT_MUTEX);

  CloseHandle (published_shared_mem);
  published_shared_mem = NULL;

  release_mutex (published_daemon_mutex);
  published_daemon_mutex = NULL;

  release_mutex (init_mutex);
}

static void
wait_console_window (void)
{
  FILE *console = fopen ("CONOUT$", "w");

  SetConsoleTitleW (L"gdbus-daemon output. Type any character to close this window.");
  fprintf (console, _("(Type any character to close this window)\n"));
  fflush (console);
  _getch ();
}

static void
open_console_window (void)
{
  if (((HANDLE) _get_osfhandle (fileno (stdout)) == INVALID_HANDLE_VALUE ||
       (HANDLE) _get_osfhandle (fileno (stderr)) == INVALID_HANDLE_VALUE) && AllocConsole ())
    {
      if ((HANDLE) _get_osfhandle (fileno (stdout)) == INVALID_HANDLE_VALUE)
        freopen ("CONOUT$", "w", stdout);

      if ((HANDLE) _get_osfhandle (fileno (stderr)) == INVALID_HANDLE_VALUE)
        freopen ("CONOUT$", "w", stderr);

      SetConsoleTitleW (L"gdbus-daemon debug output.");

      atexit (wait_console_window);
    }
}
static void
idle_timeout_cb (GDBusDaemon *daemon, gpointer user_data)
{
  GMainLoop *loop = user_data;
  g_main_loop_quit (loop);
}

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__declspec(dllexport) void CALLBACK g_win32_run_session_bus (HWND hwnd, HINSTANCE hinst, char *cmdline, int nCmdShow);

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__declspec(dllexport) void CALLBACK
g_win32_run_session_bus (HWND hwnd, HINSTANCE hinst, char *cmdline, int nCmdShow)
{
  GDBusDaemon *daemon;
  GMainLoop *loop;
  const char *address;
  GError *error = NULL;

  if (g_getenv ("GDBUS_DAEMON_DEBUG") != NULL)
    open_console_window ();

  loop = g_main_loop_new (NULL, FALSE);

  address = "nonce-tcp:";
  daemon = _g_dbus_daemon_new (address, NULL, &error);
  if (daemon == NULL)
    {
      g_printerr ("Can't init bus: %s\n", error->message);
      return;
    }

  g_signal_connect (daemon, "idle-timeout", G_CALLBACK (idle_timeout_cb), loop);

  if ( publish_session_bus (_g_dbus_daemon_get_address (daemon)))
    {
      g_main_loop_run (loop);

      unpublish_session_bus ();
    }

  g_main_loop_unref (loop);
  g_object_unref (daemon);
}

static gchar *
get_session_address_dbus_launch (GError **error)
{
  HANDLE autolaunch_mutex, init_mutex;
  char *address = NULL;
  wchar_t gio_path[MAX_PATH+1+200];

  autolaunch_mutex = acquire_mutex (DBUS_AUTOLAUNCH_MUTEX);

  init_mutex = acquire_mutex (UNIQUE_DBUS_INIT_MUTEX);

  if (is_mutex_owned (DBUS_DAEMON_MUTEX))
    address = read_shm (DBUS_DAEMON_ADDRESS_INFO);

  release_mutex (init_mutex);

  if (address == NULL)
    {
      gio_path[MAX_PATH] = 0;
      if (GetModuleFileNameW (_g_io_win32_get_module (), gio_path, MAX_PATH))
	{
	  PROCESS_INFORMATION pi = { 0 };
	  STARTUPINFOW si = { 0 };
	  BOOL res;
	  wchar_t gio_path_short[MAX_PATH];
	  wchar_t rundll_path[MAX_PATH*2];
	  wchar_t args[MAX_PATH*4];

	  GetShortPathNameW (gio_path, gio_path_short, MAX_PATH);

	  GetWindowsDirectoryW (rundll_path, MAX_PATH);
	  wcscat (rundll_path, L"\\rundll32.exe");
	  if (GetFileAttributesW (rundll_path) == INVALID_FILE_ATTRIBUTES)
	    {
	      GetSystemDirectoryW (rundll_path, MAX_PATH);
	      wcscat (rundll_path, L"\\rundll32.exe");
	    }

	  wcscpy (args, L"\"");
	  wcscat (args, rundll_path);
	  wcscat (args, L"\" ");
	  wcscat (args, gio_path_short);
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#ifdef _MSC_VER
#if defined(_WIN64) || defined(_M_X64) || defined(_M_AMD64)
	  wcscat (args, L",g_win32_run_session_bus");
#else
	  wcscat (args, L",_g_win32_run_session_bus@16");
#endif
#else
1410
	  wcscat (args, L",g_win32_run_session_bus@16");
1411
#endif
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434

	  res = CreateProcessW (rundll_path, args,
				0, 0, FALSE,
				NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW | DETACHED_PROCESS,
				0, NULL /* TODO: Should be root */,
				&si, &pi);
	  if (res)
	    address = read_shm (DBUS_DAEMON_ADDRESS_INFO);
	}
    }

  release_mutex (autolaunch_mutex);

  if (address == NULL)
    g_set_error (error,
		 G_IO_ERROR,
		 G_IO_ERROR_FAILED,
		 _("Session dbus not running, and autolaunch failed"));

  return address;
}
#endif

1435 1436
/* ---------------------------------------------------------------------------------------------------- */

1437
static gchar *
1438
get_session_address_platform_specific (GError **error)
1439
{
1440
  gchar *ret;
1441
#if defined (G_OS_UNIX) || defined(G_OS_WIN32)
1442
  /* need to handle OS X in a different way since 'dbus-launch --autolaunch' probably won't work there */
1443 1444
  ret = get_session_address_dbus_launch (error);
#else
1445
  /* TODO: implement for OS X */
1446 1447 1448 1449 1450 1451 1452
  ret = NULL;
  g_set_error (error,
               G_IO_ERROR,
               G_IO_ERROR_FAILED,
               _("Cannot determine session bus address (not implemented for this OS)"));
#endif
  return ret;
1453 1454 1455 1456 1457 1458 1459
}

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

/**
 * g_dbus_address_get_for_bus_sync:
 * @bus_type: A #GBusType.
1460
 * @cancellable: (allow-none): A #GCancellable or %NULL.
1461 1462 1463 1464 1465 1466 1467
 * @error: Return location for error or %NULL.
 *
 * Synchronously looks up the D-Bus address for the well-known message
 * bus instance specified by @bus_type. This may involve using various
 * platform specific mechanisms.
 *
 * Returns: A valid D-Bus address string for @bus_type or %NULL if @error is set.
1468 1469
 *
 * Since: 2.26
1470 1471 1472 1473 1474 1475 1476 1477
 */
gchar *
g_dbus_address_get_for_bus_sync (GBusType       bus_type,
                                 GCancellable  *cancellable,
                                 GError       **error)
{
  gchar *ret;
  const gchar *starter_bus;
1478
  GError *local_error;
1479 1480 1481 1482

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

  ret = NULL;
1483 1484 1485 1486 1487 1488
  local_error = NULL;

  if (G_UNLIKELY (_g_dbus_debug_address ()))
    {
      guint n;
      _g_dbus_debug_print_lock ();
1489
      g_print ("GDBus-debug:Address: In g_dbus_address_get_for_bus_sync() for bus type '%s'\n",
1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
               _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type));
      for (n = 0; n < 3; n++)
        {
          const gchar *k;
          const gchar *v;
          switch (n)
            {
            case 0: k = "DBUS_SESSION_BUS_ADDRESS"; break;
            case 1: k = "DBUS_SYSTEM_BUS_ADDRESS"; break;
            case 2: k = "DBUS_STARTER_BUS_TYPE"; break;
            default: g_assert_not_reached ();
            }
          v = g_getenv (k);
          g_print ("GDBus-debug:Address: env var %s", k);
          if (v != NULL)
1505
            g_print ("='%s'\n", v);
1506 1507 1508 1509 1510
          else
            g_print (" is not set\n");
        }
      _g_dbus_debug_print_unlock ();
    }
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525

  switch (bus_type)
    {
    case G_BUS_TYPE_SYSTEM:
      ret = g_strdup (g_getenv ("DBUS_SYSTEM_BUS_ADDRESS"));
      if (ret == NULL)
        {
          ret = g_strdup ("unix:path=/var/run/dbus/system_bus_socket");
        }
      break;

    case G_BUS_TYPE_SESSION:
      ret = g_strdup (g_getenv ("DBUS_SESSION_BUS_ADDRESS"));
      if (ret == NULL)
        {
1526
          ret = get_session_address_platform_specific (&local_error);
1527 1528 1529 1530 1531 1532 1533
        }
      break;

    case G_BUS_TYPE_STARTER:
      starter_bus = g_getenv ("DBUS_STARTER_BUS_TYPE");
      if (g_strcmp0 (starter_bus, "session") == 0)
        {
1534
          ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SESSION, cancellable, &local_error);
1535 1536 1537 1538
          goto out;
        }
      else if (g_strcmp0 (starter_bus, "system") == 0)
        {
1539
          ret = g_dbus_address_get_for_bus_sync (G_BUS_TYPE_SYSTEM, cancellable, &local_error);
1540 1541 1542 1543 1544 1545
          goto out;
        }
      else
        {
          if (starter_bus != NULL)
            {
1546
              g_set_error (&local_error,
1547 1548 1549
                           G_IO_ERROR,
                           G_IO_ERROR_FAILED,
                           _("Cannot determine bus address from DBUS_STARTER_BUS_TYPE environment variable"
1550
                             " - unknown value '%s'"),
1551 1552 1553 1554
                           starter_bus);
            }
          else
            {
1555
              g_set_error_literal (&local_error,
1556 1557 1558 1559 1560 1561 1562 1563 1564
                                   G_IO_ERROR,
                                   G_IO_ERROR_FAILED,
                                   _("Cannot determine bus address because the DBUS_STARTER_BUS_TYPE environment "
                                     "variable is not set"));
            }
        }
      break;

    default:
1565
      g_set_error (&local_error,
1566 1567 1568 1569 1570 1571 1572 1573
                   G_IO_ERROR,
                   G_IO_ERROR_FAILED,
                   _("Unknown bus type %d"),
                   bus_type);
      break;
    }

 out:
1574 1575 1576 1577 1578
  if (G_UNLIKELY (_g_dbus_debug_address ()))
    {
      _g_dbus_debug_print_lock ();
      if (ret != NULL)
        {
1579
          g_print ("GDBus-debug:Address: Returning address '%s' for bus type '%s'\n",
1580 1581 1582 1583 1584
                   ret,
                   _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type));
        }
      else
        {
1585
          g_print ("GDBus-debug:Address: Cannot look-up address bus type '%s': %s\n",
1586
                   _g_dbus_enum_to_string (G_TYPE_BUS_TYPE, bus_type),
1587
                   local_error ? local_error->message : "");
1588 1589 1590 1591 1592 1593 1594
        }
      _g_dbus_debug_print_unlock ();
    }

  if (local_error != NULL)
    g_propagate_error (error, local_error);

1595 1596
  return ret;
}
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

/**
 * g_dbus_address_escape_value:
 * @string: an unescaped string to be included in a D-Bus address
 *  as the value in a key-value pair
 *
 * Escape @string so it can appear in a D-Bus address as the value
 * part of a key-value pair.
 *
 * For instance, if @string is <code>/run/bus-for-:0</code>,
 * this function would return <code>/run/bus-for-%3A0</code>,
 * which could be used in a D-Bus address like
 * <code>unix:nonce-tcp:host=127.0.0.1,port=42,noncefile=/run/bus-for-%3A0</code>.
 *
 * Returns: (transfer full): a copy of @string with all
 *  non-optionally-escaped bytes escaped
 *
 * Since: 2.36
 */
gchar *
g_dbus_address_escape_value (const gchar *string)
{
  GString *s;
  gsize i;

  g_return_val_if_fail (string != NULL, NULL);

  /* There will often not be anything needing escaping at all. */
  s = g_string_sized_new (strlen (string));

  /* D-Bus address escaping is mostly the same as URI escaping... */
  g_string_append_uri_escaped (s, string, "\\/", FALSE);

  /* ... but '~' is an unreserved character in URIs, but a
   * non-optionally-escaped character in D-Bus addresses. */
  for (i = 0; i < s->len; i++)
    {
      if (G_UNLIKELY (s->str[i] == '~'))
        {
          s->str[i] = '%';
          g_string_insert (s, i + 1, "7E");
          i += 2;
        }
    }

  return g_string_free (s, FALSE);
}