/**
* Gets the hex-encoded UUID of the machine this function is
* executed on. This UUID is guaranteed to be the same for a given
* machine at least until it next reboots, though it also
* makes some effort to be the same forever, it may change if the
* machine is reconfigured or its hardware is modified.
*
* @param uuid_str string to append hex-encoded machine uuid to
* @returns #FALSE if no memory
*/
dbus_bool_t
_dbus_get_local_machine_uuid_encoded (DBusString *uuid_str)
{
dbus_bool_t ok;
_DBUS_LOCK (machine_uuid);
if (machine_uuid_initialized_generation != _dbus_current_generation)
{
DBusError error = DBUS_ERROR_INIT;
if (!_dbus_read_local_machine_uuid (&machine_uuid, FALSE,
&error))
{
#ifndef DBUS_BUILD_TESTS
/* For the test suite, we may not be installed so just continue silently
* here. But in a production build, we want to be nice and loud about
* this.
*/
_dbus_warn_check_failed ("D-Bus library appears to be incorrectly set up; failed to read machine uuid: %s\n"
"See the manual page for dbus-uuidgen to correct this issue.\n",
error.message);
#endif
dbus_error_free (&error);
_dbus_generate_uuid (&machine_uuid);
}
}
ok = _dbus_uuid_encode (&machine_uuid, uuid_str);
_DBUS_UNLOCK (machine_uuid);
return ok;
}
/**
* Reads (and optionally writes) a uuid to a file. Initializes the uuid
* unless an error is returned.
*
* @param filename the name of the file
* @param uuid uuid to be initialized with the loaded uuid
* @param create_if_not_found #TRUE to create a new uuid and save it if the file doesn't exist
* @param error the error return
* @returns #FALSE if the error is set
*/
dbus_bool_t
_dbus_read_uuid_file (const DBusString *filename,
DBusGUID *uuid,
dbus_bool_t create_if_not_found,
DBusError *error)
{
DBusError read_error = DBUS_ERROR_INIT;
if (_dbus_read_uuid_file_without_creating (filename, uuid, &read_error))
return TRUE;
if (!create_if_not_found)
{
dbus_move_error (&read_error, error);
return FALSE;
}
/* If the file exists and contains junk, we want to keep that error
* message instead of overwriting it with a "file exists" error
* message when we try to write
*/
if (dbus_error_has_name (&read_error, DBUS_ERROR_INVALID_FILE_CONTENT))
{
dbus_move_error (&read_error, error);
return FALSE;
}
else
{
dbus_error_free (&read_error);
_dbus_generate_uuid (uuid);
return _dbus_write_uuid_file (filename, uuid, error);
}
}
/**
* For use by the dbus-uuidgen binary ONLY, do not call this.
* We can and will change this function without modifying
* the libdbus soname.
*
* @param uuid_p out param to return the uuid
* @returns #FALSE if no memory
*/
dbus_bool_t
dbus_internal_do_not_use_create_uuid (char **uuid_p)
{
DBusGUID uuid;
_dbus_generate_uuid (&uuid);
return return_uuid (&uuid, uuid_p, NULL);
}
static dbus_bool_t
_dbus_create_uuid_file_exclusively (const DBusString *filename,
DBusGUID *uuid,
DBusError *error)
{
DBusString encoded;
if (!_dbus_string_init (&encoded))
{
_DBUS_SET_OOM (error);
return FALSE;
}
_dbus_generate_uuid (uuid);
if (!_dbus_uuid_encode (uuid, &encoded))
{
_DBUS_SET_OOM (error);
goto error;
}
/* FIXME this is racy; we need a save_file_exclusively
* function. But in practice this should be fine for now.
*
* - first be sure we can create the file and it
* doesn't exist by creating it empty with O_EXCL
* - then create it by creating a temporary file and
* overwriting atomically with rename()
*/
if (!_dbus_create_file_exclusively (filename, error))
goto error;
if (!_dbus_string_append_byte (&encoded, '\n'))
{
_DBUS_SET_OOM (error);
goto error;
}
if (!_dbus_string_save_to_file (&encoded, filename, error))
goto error;
if (!_dbus_make_file_world_readable (filename, error))
goto error;
_dbus_string_free (&encoded);
_DBUS_ASSERT_ERROR_IS_CLEAR (error);
return TRUE;
error:
_DBUS_ASSERT_ERROR_IS_SET (error);
_dbus_string_free (&encoded);
return FALSE;
}
/**
* Initializes the members of the DBusServer base class.
* Chained up to by subclass constructors.
*
* @param server the server.
* @param vtable the vtable for the subclass.
* @param address the server's address
* @returns #TRUE on success.
*/
dbus_bool_t
_dbus_server_init_base (DBusServer *server,
const DBusServerVTable *vtable,
const DBusString *address)
{
server->vtable = vtable;
#ifdef DBUS_DISABLE_ASSERT
_dbus_atomic_inc (&server->refcount);
#else
{
dbus_int32_t old_refcount = _dbus_atomic_inc (&server->refcount);
_dbus_assert (old_refcount == 0);
}
#endif
server->address = NULL;
server->watches = NULL;
server->timeouts = NULL;
server->published_address = FALSE;
if (!_dbus_string_init (&server->guid_hex))
return FALSE;
_dbus_generate_uuid (&server->guid);
if (!_dbus_uuid_encode (&server->guid, &server->guid_hex))
goto failed;
server->address = copy_address_with_guid_appended (address,
&server->guid_hex);
if (server->address == NULL)
goto failed;
_dbus_rmutex_new_at_location (&server->mutex);
if (server->mutex == NULL)
goto failed;
server->watches = _dbus_watch_list_new ();
if (server->watches == NULL)
goto failed;
server->timeouts = _dbus_timeout_list_new ();
if (server->timeouts == NULL)
goto failed;
_dbus_data_slot_list_init (&server->slot_list);
_dbus_verbose ("Initialized server on address %s\n", server->address);
return TRUE;
failed:
_dbus_rmutex_free_at_location (&server->mutex);
server->mutex = NULL;
if (server->watches)
{
_dbus_watch_list_free (server->watches);
server->watches = NULL;
}
if (server->timeouts)
{
_dbus_timeout_list_free (server->timeouts);
server->timeouts = NULL;
}
if (server->address)
{
dbus_free (server->address);
server->address = NULL;
}
_dbus_string_free (&server->guid_hex);
return FALSE;
}
/**
* Initializes the members of the DBusServer base class.
* Chained up to by subclass constructors.
*
* @param server the server.
* @param vtable the vtable for the subclass.
* @param address the server's address
* @returns #TRUE on success.
*/
dbus_bool_t
_dbus_server_init_base (DBusServer *server,
const DBusServerVTable *vtable,
const DBusString *address)
{
server->vtable = vtable;
server->refcount.value = 1;
server->address = NULL;
server->watches = NULL;
server->timeouts = NULL;
if (!_dbus_string_init (&server->guid_hex))
return FALSE;
_dbus_generate_uuid (&server->guid);
if (!_dbus_uuid_encode (&server->guid, &server->guid_hex))
goto failed;
server->address = copy_address_with_guid_appended (address,
&server->guid_hex);
if (server->address == NULL)
goto failed;
_dbus_mutex_new_at_location (&server->mutex);
if (server->mutex == NULL)
goto failed;
server->watches = _dbus_watch_list_new ();
if (server->watches == NULL)
goto failed;
server->timeouts = _dbus_timeout_list_new ();
if (server->timeouts == NULL)
goto failed;
_dbus_data_slot_list_init (&server->slot_list);
_dbus_verbose ("Initialized server on address %s\n", server->address);
return TRUE;
failed:
_dbus_mutex_free_at_location (&server->mutex);
server->mutex = NULL;
if (server->watches)
{
_dbus_watch_list_free (server->watches);
server->watches = NULL;
}
if (server->timeouts)
{
_dbus_timeout_list_free (server->timeouts);
server->timeouts = NULL;
}
if (server->address)
{
dbus_free (server->address);
server->address = NULL;
}
_dbus_string_free (&server->guid_hex);
return FALSE;
}
