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gnome-shell/src/shell-global.c
Will Thompson a207f67f73 global: Don't trust persistent/runtime state data 
An Endless OS system was found in the wild with a malformed
.local/share/gnome-shell/notifications. When deserialized in Python,
after passing trusted=True to g_variant_new_from_bytes(), the first
element of the first struct in the array looks like this:

    In [41]: _38.get_child_value(0).get_child_value(0)
    Out[41]: GLib.Variant('s', '\Uffffffff\Uffffffff\Uffffffff\Uffffffff\Uffffffff')

When deserialised in GJS, we get:

    gjs> v.get_child_value(0).get_child_value(0)
    [object variant of type "s"]
    gjs> v.get_child_value(0).get_child_value(0).get_string()
    typein:43:1 malformed UTF-8 character sequence at offset 0
      @typein:43:1
      @<stdin>:1:34

While g_variant_new_from_bytes() doesn't have much to say about its
'trusted' parameter, g_variant_new_from_data() does:

> If data is trusted to be serialised data in normal form then trusted
> should be TRUE. This applies to serialised data created within this
> process or read from a trusted location on the disk (such as a file
> installed in /usr/lib alongside your application). You should set
> trusted to FALSE if data is read from the network, a file in the
> user's home directory, etc.

Persistent state is read from the user's home directory, so it should
not be trusted. With trusted=False, the string value above comes out as
"".

I don't have an explanation for how this file ended up being malformed.
I also don't have an explanation for when this started crashing: my
guess is that recent GJS became stricter about validating UTF-8 but I
could be wrong!

https://gitlab.gnome.org/GNOME/gnome-shell/issues/1552
2019-09-03 01:00:50 +00:00

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#include "config.h"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <math.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#include <locale.h>
#include <X11/extensions/Xfixes.h>
#include <clutter/x11/clutter-x11.h>
#include <gdk/gdkx.h>
#include <gio/gio.h>
#include <girepository.h>
#include <meta/meta-backend.h>
#include <meta/display.h>
#include <meta/util.h>
#include <meta/meta-shaped-texture.h>
#include <meta/meta-cursor-tracker.h>
#include <meta/meta-settings.h>
#include <meta/meta-workspace-manager.h>
#include <meta/meta-x11-display.h>
/* Memory report bits */
#ifdef HAVE_MALLINFO
#include <malloc.h>
#endif
#if defined __OpenBSD__ || defined __FreeBSD__
#include <sys/sysctl.h>
#endif
#include "shell-enum-types.h"
#include "shell-global-private.h"
#include "shell-perf-log.h"
#include "shell-window-tracker.h"
#include "shell-wm.h"
#include "st.h"
static ShellGlobal *the_object = NULL;
struct _ShellGlobal {
GObject parent;
ClutterStage *stage;
MetaDisplay *meta_display;
MetaWorkspaceManager *workspace_manager;
Display *xdisplay;
char *session_mode;
XserverRegion input_region;
GjsContext *js_context;
MetaPlugin *plugin;
ShellWM *wm;
GSettings *settings;
const char *datadir;
char *imagedir;
char *userdatadir;
GFile *userdatadir_path;
GFile *runtime_state_path;
StFocusManager *focus_manager;
guint work_count;
GSList *leisure_closures;
guint leisure_function_id;
GHashTable *save_ops;
gboolean has_modal;
gboolean frame_timestamps;
gboolean frame_finish_timestamp;
};
enum {
PROP_0,
PROP_SESSION_MODE,
PROP_DISPLAY,
PROP_WORKSPACE_MANAGER,
PROP_SCREEN_WIDTH,
PROP_SCREEN_HEIGHT,
PROP_STAGE,
PROP_WINDOW_GROUP,
PROP_TOP_WINDOW_GROUP,
PROP_WINDOW_MANAGER,
PROP_SETTINGS,
PROP_DATADIR,
PROP_IMAGEDIR,
PROP_USERDATADIR,
PROP_FOCUS_MANAGER,
PROP_FRAME_TIMESTAMPS,
PROP_FRAME_FINISH_TIMESTAMP,
};
/* Signals */
enum
{
NOTIFY_ERROR,
LOCATE_POINTER,
LAST_SIGNAL
};
G_DEFINE_TYPE(ShellGlobal, shell_global, G_TYPE_OBJECT);
static guint shell_global_signals [LAST_SIGNAL] = { 0 };
static void
shell_global_set_property(GObject *object,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
ShellGlobal *global = SHELL_GLOBAL (object);
switch (prop_id)
{
case PROP_SESSION_MODE:
g_clear_pointer (&global->session_mode, g_free);
global->session_mode = g_ascii_strdown (g_value_get_string (value), -1);
break;
case PROP_FRAME_TIMESTAMPS:
global->frame_timestamps = g_value_get_boolean (value);
break;
case PROP_FRAME_FINISH_TIMESTAMP:
global->frame_finish_timestamp = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_global_get_property(GObject *object,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
ShellGlobal *global = SHELL_GLOBAL (object);
switch (prop_id)
{
case PROP_SESSION_MODE:
g_value_set_string (value, shell_global_get_session_mode (global));
break;
case PROP_DISPLAY:
g_value_set_object (value, global->meta_display);
break;
case PROP_WORKSPACE_MANAGER:
g_value_set_object (value, global->workspace_manager);
break;
case PROP_SCREEN_WIDTH:
{
int width, height;
meta_display_get_size (global->meta_display, &width, &height);
g_value_set_int (value, width);
}
break;
case PROP_SCREEN_HEIGHT:
{
int width, height;
meta_display_get_size (global->meta_display, &width, &height);
g_value_set_int (value, height);
}
break;
case PROP_STAGE:
g_value_set_object (value, global->stage);
break;
case PROP_WINDOW_GROUP:
g_value_set_object (value, meta_get_window_group_for_display (global->meta_display));
break;
case PROP_TOP_WINDOW_GROUP:
g_value_set_object (value, meta_get_top_window_group_for_display (global->meta_display));
break;
case PROP_WINDOW_MANAGER:
g_value_set_object (value, global->wm);
break;
case PROP_SETTINGS:
g_value_set_object (value, global->settings);
break;
case PROP_DATADIR:
g_value_set_string (value, global->datadir);
break;
case PROP_IMAGEDIR:
g_value_set_string (value, global->imagedir);
break;
case PROP_USERDATADIR:
g_value_set_string (value, global->userdatadir);
break;
case PROP_FOCUS_MANAGER:
g_value_set_object (value, global->focus_manager);
break;
case PROP_FRAME_TIMESTAMPS:
g_value_set_boolean (value, global->frame_timestamps);
break;
case PROP_FRAME_FINISH_TIMESTAMP:
g_value_set_boolean (value, global->frame_finish_timestamp);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
shell_global_init (ShellGlobal *global)
{
const char *datadir = g_getenv ("GNOME_SHELL_DATADIR");
const char *shell_js = g_getenv("GNOME_SHELL_JS");
char *imagedir, **search_path;
char *path;
const char *byteorder_string;
if (!datadir)
datadir = GNOME_SHELL_DATADIR;
global->datadir = datadir;
/* We make sure imagedir ends with a '/', since the JS won't have
* access to g_build_filename() and so will end up just
* concatenating global.imagedir to a filename.
*/
imagedir = g_build_filename (datadir, "images/", NULL);
if (g_file_test (imagedir, G_FILE_TEST_IS_DIR))
global->imagedir = imagedir;
else
{
g_free (imagedir);
global->imagedir = g_strdup_printf ("%s/", datadir);
}
/* Ensure config dir exists for later use */
global->userdatadir = g_build_filename (g_get_user_data_dir (), "gnome-shell", NULL);
g_mkdir_with_parents (global->userdatadir, 0700);
global->userdatadir_path = g_file_new_for_path (global->userdatadir);
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
byteorder_string = "LE";
#else
byteorder_string = "BE";
#endif
/* And the runtime state */
path = g_strdup_printf ("%s/gnome-shell/runtime-state-%s.%s",
g_get_user_runtime_dir (),
byteorder_string,
XDisplayName (NULL));
(void) g_mkdir_with_parents (path, 0700);
global->runtime_state_path = g_file_new_for_path (path);
g_free (path);
global->settings = g_settings_new ("org.gnome.shell");
if (shell_js)
{
int i, j;
search_path = g_strsplit (shell_js, ":", -1);
/* The naive g_strsplit above will split 'resource:///foo/bar' into 'resource',
* '///foo/bar'. Combine these back together by looking for a literal 'resource'
* in the array. */
for (i = 0, j = 0; search_path[i];)
{
char *out;
if (strcmp (search_path[i], "resource") == 0 && search_path[i + 1] != NULL)
{
out = g_strconcat (search_path[i], ":", search_path[i + 1], NULL);
g_free (search_path[i]);
g_free (search_path[i + 1]);
i += 2;
}
else
{
out = search_path[i];
i += 1;
}
search_path[j++] = out;
}
search_path[j] = NULL; /* NULL-terminate the now possibly shorter array */
}
else
{
search_path = g_malloc0 (2 * sizeof (char *));
search_path[0] = g_strdup ("resource:///org/gnome/shell");
}
global->js_context = g_object_new (GJS_TYPE_CONTEXT,
"search-path", search_path,
NULL);
g_strfreev (search_path);
global->save_ops = g_hash_table_new_full (g_file_hash,
(GEqualFunc) g_file_equal,
g_object_unref, g_object_unref);
}
static void
shell_global_finalize (GObject *object)
{
ShellGlobal *global = SHELL_GLOBAL (object);
g_clear_object (&global->js_context);
g_object_unref (global->settings);
the_object = NULL;
g_clear_object (&global->userdatadir_path);
g_clear_object (&global->runtime_state_path);
g_free (global->session_mode);
g_free (global->imagedir);
g_free (global->userdatadir);
g_hash_table_unref (global->save_ops);
G_OBJECT_CLASS(shell_global_parent_class)->finalize (object);
}
static void
shell_global_class_init (ShellGlobalClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->get_property = shell_global_get_property;
gobject_class->set_property = shell_global_set_property;
gobject_class->finalize = shell_global_finalize;
shell_global_signals[NOTIFY_ERROR] =
g_signal_new ("notify-error",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 2,
G_TYPE_STRING,
G_TYPE_STRING);
shell_global_signals[LOCATE_POINTER] =
g_signal_new ("locate-pointer",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
g_object_class_install_property (gobject_class,
PROP_SESSION_MODE,
g_param_spec_string ("session-mode",
"Session Mode",
"The session mode to use",
"user",
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SCREEN_WIDTH,
g_param_spec_int ("screen-width",
"Screen Width",
"Screen width, in pixels",
0, G_MAXINT, 1,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SCREEN_HEIGHT,
g_param_spec_int ("screen-height",
"Screen Height",
"Screen height, in pixels",
0, G_MAXINT, 1,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_DISPLAY,
g_param_spec_object ("display",
"Display",
"Metacity display object for the shell",
META_TYPE_DISPLAY,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_WORKSPACE_MANAGER,
g_param_spec_object ("workspace-manager",
"Workspace manager",
"Workspace manager",
META_TYPE_WORKSPACE_MANAGER,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_STAGE,
g_param_spec_object ("stage",
"Stage",
"Stage holding the desktop scene graph",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_WINDOW_GROUP,
g_param_spec_object ("window-group",
"Window Group",
"Actor holding window actors",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_TOP_WINDOW_GROUP,
g_param_spec_object ("top-window-group",
"Top Window Group",
"Actor holding override-redirect windows",
CLUTTER_TYPE_ACTOR,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_WINDOW_MANAGER,
g_param_spec_object ("window-manager",
"Window Manager",
"Window management interface",
SHELL_TYPE_WM,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_SETTINGS,
g_param_spec_object ("settings",
"Settings",
"GSettings instance for gnome-shell configuration",
G_TYPE_SETTINGS,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_DATADIR,
g_param_spec_string ("datadir",
"Data directory",
"Directory containing gnome-shell data files",
NULL,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_IMAGEDIR,
g_param_spec_string ("imagedir",
"Image directory",
"Directory containing gnome-shell image files",
NULL,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_USERDATADIR,
g_param_spec_string ("userdatadir",
"User data directory",
"Directory containing gnome-shell user data",
NULL,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_FOCUS_MANAGER,
g_param_spec_object ("focus-manager",
"Focus manager",
"The shell's StFocusManager",
ST_TYPE_FOCUS_MANAGER,
G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_FRAME_TIMESTAMPS,
g_param_spec_boolean ("frame-timestamps",
"Frame Timestamps",
"Whether to log frame timestamps in the performance log",
FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class,
PROP_FRAME_FINISH_TIMESTAMP,
g_param_spec_boolean ("frame-finish-timestamp",
"Frame Finish Timestamps",
"Whether at the end of a frame to call glFinish and log paintCompletedTimestamp",
FALSE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
/*
* _shell_global_init: (skip)
* @first_property_name: the name of the first property
* @...: the value of the first property, followed optionally by more
* name/value pairs, followed by %NULL
*
* Initializes the shell global singleton with the construction-time
* properties.
*
* There are currently no such properties, so @first_property_name should
* always be %NULL.
*
* This call must be called before shell_global_get() and shouldn't be called
* more than once.
*/
void
_shell_global_init (const char *first_property_name,
...)
{
va_list argument_list;
g_return_if_fail (the_object == NULL);
va_start (argument_list, first_property_name);
the_object = SHELL_GLOBAL (g_object_new_valist (SHELL_TYPE_GLOBAL,
first_property_name,
argument_list));
va_end (argument_list);
}
/**
* shell_global_get:
*
* Gets the singleton global object that represents the desktop.
*
* Return value: (transfer none): the singleton global object
*/
ShellGlobal *
shell_global_get (void)
{
return the_object;
}
/**
* _shell_global_destroy_gjs_context: (skip)
* @self: global object
*
* Destroys the GjsContext held by ShellGlobal, in order to break reference
* counting cycles. (The GjsContext holds a reference to ShellGlobal because
* it's available as window.global inside JS.)
*/
void
_shell_global_destroy_gjs_context (ShellGlobal *self)
{
g_clear_object (&self->js_context);
}
static guint32
get_current_time_maybe_roundtrip (ShellGlobal *global)
{
guint32 time;
time = shell_global_get_current_time (global);
if (time != CurrentTime)
return time;
return meta_display_get_current_time_roundtrip (global->meta_display);
}
static void
focus_window_changed (MetaDisplay *display,
GParamSpec *param,
gpointer user_data)
{
ShellGlobal *global = user_data;
if (global->has_modal)
return;
/* If the stage window became unfocused, drop the key focus
* on Clutter's side. */
if (!meta_stage_is_focused (global->meta_display))
clutter_stage_set_key_focus (global->stage, NULL);
}
static ClutterActor *
get_key_focused_actor (ShellGlobal *global)
{
ClutterActor *actor;
actor = clutter_stage_get_key_focus (global->stage);
/* If there's no explicit key focus, clutter_stage_get_key_focus()
* returns the stage. This is a terrible API. */
if (actor == CLUTTER_ACTOR (global->stage))
actor = NULL;
return actor;
}
static void
sync_stage_window_focus (ShellGlobal *global)
{
ClutterActor *actor;
if (global->has_modal)
return;
actor = get_key_focused_actor (global);
/* An actor got key focus and the stage needs to be focused. */
if (actor != NULL && !meta_stage_is_focused (global->meta_display))
meta_focus_stage_window (global->meta_display,
get_current_time_maybe_roundtrip (global));
/* An actor dropped key focus. Focus the default window. */
else if (actor == NULL && meta_stage_is_focused (global->meta_display))
meta_display_focus_default_window (global->meta_display,
get_current_time_maybe_roundtrip (global));
}
static void
focus_actor_changed (ClutterStage *stage,
GParamSpec *param,
gpointer user_data)
{
ShellGlobal *global = user_data;
sync_stage_window_focus (global);
}
static void
sync_input_region (ShellGlobal *global)
{
MetaDisplay *display = global->meta_display;
MetaX11Display *x11_display = meta_display_get_x11_display (display);
if (global->has_modal)
meta_x11_display_set_stage_input_region (x11_display, None);
else
meta_x11_display_set_stage_input_region (x11_display, global->input_region);
}
/**
* shell_global_set_stage_input_region:
* @global: the #ShellGlobal
* @rectangles: (element-type Meta.Rectangle): a list of #MetaRectangle
* describing the input region.
*
* Sets the area of the stage that is responsive to mouse clicks when
* we don't have a modal or grab.
*/
void
shell_global_set_stage_input_region (ShellGlobal *global,
GSList *rectangles)
{
MetaRectangle *rect;
XRectangle *rects;
int nrects, i;
GSList *r;
g_return_if_fail (SHELL_IS_GLOBAL (global));
if (meta_is_wayland_compositor ())
return;
nrects = g_slist_length (rectangles);
rects = g_new (XRectangle, nrects);
for (r = rectangles, i = 0; r; r = r->next, i++)
{
rect = (MetaRectangle *)r->data;
rects[i].x = rect->x;
rects[i].y = rect->y;
rects[i].width = rect->width;
rects[i].height = rect->height;
}
if (global->input_region)
XFixesDestroyRegion (global->xdisplay, global->input_region);
global->input_region = XFixesCreateRegion (global->xdisplay, rects, nrects);
g_free (rects);
sync_input_region (global);
}
/**
* shell_global_get_stage:
*
* Return value: (transfer none): The default #ClutterStage
*/
ClutterStage *
shell_global_get_stage (ShellGlobal *global)
{
return global->stage;
}
/**
* shell_global_get_display:
*
* Return value: (transfer none): The default #MetaDisplay
*/
MetaDisplay *
shell_global_get_display (ShellGlobal *global)
{
return global->meta_display;
}
/**
* shell_global_get_window_actors:
*
* Gets the list of #MetaWindowActor for the plugin's screen
*
* Return value: (element-type Meta.WindowActor) (transfer container): the list of windows
*/
GList *
shell_global_get_window_actors (ShellGlobal *global)
{
GList *filtered = NULL;
GList *l;
g_return_val_if_fail (SHELL_IS_GLOBAL (global), NULL);
for (l = meta_get_window_actors (global->meta_display); l; l = l->next)
if (!meta_window_actor_is_destroyed (l->data))
filtered = g_list_prepend (filtered, l->data);
return g_list_reverse (filtered);
}
static void
global_stage_notify_width (GObject *gobject,
GParamSpec *pspec,
gpointer data)
{
ShellGlobal *global = SHELL_GLOBAL (data);
g_object_notify (G_OBJECT (global), "screen-width");
}
static void
global_stage_notify_height (GObject *gobject,
GParamSpec *pspec,
gpointer data)
{
ShellGlobal *global = SHELL_GLOBAL (data);
g_object_notify (G_OBJECT (global), "screen-height");
}
static gboolean
global_stage_before_paint (gpointer data)
{
ShellGlobal *global = SHELL_GLOBAL (data);
if (global->frame_timestamps)
shell_perf_log_event (shell_perf_log_get_default (),
"clutter.stagePaintStart");
return TRUE;
}
static gboolean
load_gl_symbol (const char *name,
void **func)
{
*func = cogl_get_proc_address (name);
if (!*func)
{
g_warning ("failed to resolve required GL symbol \"%s\"\n", name);
return FALSE;
}
return TRUE;
}
static void
global_stage_after_paint (ClutterStage *stage,
ShellGlobal *global)
{
/* At this point, we've finished all layout and painting, but haven't
* actually flushed or swapped */
if (global->frame_timestamps && global->frame_finish_timestamp)
{
/* It's interesting to find out when the paint actually finishes
* on the GPU. We could wait for this asynchronously with
* ARB_timer_query (see https://bugzilla.gnome.org/show_bug.cgi?id=732350
* for an implementation of this), but what we actually would
* find out then is the latency for drawing a frame, not how much
* GPU work was needed, since frames can overlap. Calling glFinish()
* is a fairly reliable way to separate out adjacent frames
* and measure the amount of GPU work. This is turned on with a
* separate property from ::frame-timestamps, since it should not
* be turned on if we're trying to actual measure latency or frame
* rate.
*/
static void (*finish) (void);
if (!finish)
load_gl_symbol ("glFinish", (void **)&finish);
cogl_flush ();
finish ();
shell_perf_log_event (shell_perf_log_get_default (),
"clutter.paintCompletedTimestamp");
}
}
static gboolean
global_stage_after_swap (gpointer data)
{
/* Everything is done, we're ready for a new frame */
ShellGlobal *global = SHELL_GLOBAL (data);
if (global->frame_timestamps)
shell_perf_log_event (shell_perf_log_get_default (),
"clutter.stagePaintDone");
return TRUE;
}
static void
update_scaling_factor (ShellGlobal *global,
MetaSettings *settings)
{
ClutterStage *stage = CLUTTER_STAGE (global->stage);
StThemeContext *context = st_theme_context_get_for_stage (stage);
int scaling_factor;
scaling_factor = meta_settings_get_ui_scaling_factor (settings);
g_object_set (context, "scale-factor", scaling_factor, NULL);
}
static void
ui_scaling_factor_changed (MetaSettings *settings,
ShellGlobal *global)
{
update_scaling_factor (global, settings);
}
static void
entry_cursor_func (StEntry *entry,
gboolean use_ibeam,
gpointer user_data)
{
ShellGlobal *global = user_data;
meta_display_set_cursor (global->meta_display,
use_ibeam ? META_CURSOR_IBEAM : META_CURSOR_DEFAULT);
}
void
_shell_global_set_plugin (ShellGlobal *global,
MetaPlugin *plugin)
{
MetaDisplay *display;
MetaBackend *backend;
MetaSettings *settings;
g_return_if_fail (SHELL_IS_GLOBAL (global));
g_return_if_fail (global->plugin == NULL);
global->plugin = plugin;
global->wm = shell_wm_new (plugin);
display = meta_plugin_get_display (plugin);
global->meta_display = display;
global->workspace_manager = meta_display_get_workspace_manager (display);
global->stage = CLUTTER_STAGE (meta_get_stage_for_display (display));
if (!meta_is_wayland_compositor ())
{
MetaX11Display *x11_display = meta_display_get_x11_display (display);
global->xdisplay = meta_x11_display_get_xdisplay (x11_display);
}
st_entry_set_cursor_func (entry_cursor_func, global);
st_clipboard_set_selection (meta_display_get_selection (display));
g_signal_connect (global->stage, "notify::width",
G_CALLBACK (global_stage_notify_width), global);
g_signal_connect (global->stage, "notify::height",
G_CALLBACK (global_stage_notify_height), global);
clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_PRE_PAINT,
global_stage_before_paint,
global, NULL);
g_signal_connect (global->stage, "after-paint",
G_CALLBACK (global_stage_after_paint), global);
clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_POST_PAINT,
global_stage_after_swap,
global, NULL);
shell_perf_log_define_event (shell_perf_log_get_default(),
"clutter.stagePaintStart",
"Start of stage page repaint",
"");
shell_perf_log_define_event (shell_perf_log_get_default(),
"clutter.paintCompletedTimestamp",
"Paint completion on GPU",
"");
shell_perf_log_define_event (shell_perf_log_get_default(),
"clutter.stagePaintDone",
"End of frame, possibly including swap time",
"");
g_signal_connect (global->stage, "notify::key-focus",
G_CALLBACK (focus_actor_changed), global);
g_signal_connect (global->meta_display, "notify::focus-window",
G_CALLBACK (focus_window_changed), global);
backend = meta_get_backend ();
settings = meta_backend_get_settings (backend);
g_signal_connect (settings, "ui-scaling-factor-changed",
G_CALLBACK (ui_scaling_factor_changed), global);
global->focus_manager = st_focus_manager_get_for_stage (global->stage);
update_scaling_factor (global, settings);
}
GjsContext *
_shell_global_get_gjs_context (ShellGlobal *global)
{
return global->js_context;
}
/**
* shell_global_begin_modal:
* @global: a #ShellGlobal
*
* Grabs the keyboard and mouse to the stage window. The stage will
* receive all keyboard and mouse events until shell_global_end_modal()
* is called. This is used to implement "modes" for the shell, such as the
* overview mode or the "looking glass" debug overlay, that block
* application and normal key shortcuts.
*
* Returns: %TRUE if we succesfully entered the mode. %FALSE if we couldn't
* enter the mode. Failure may occur because an application has the pointer
* or keyboard grabbed, because Mutter is in a mode itself like moving a
* window or alt-Tab window selection, or because shell_global_begin_modal()
* was previouly called.
*/
gboolean
shell_global_begin_modal (ShellGlobal *global,
guint32 timestamp,
MetaModalOptions options)
{
/* Make it an error to call begin_modal while we already
* have a modal active. */
if (global->has_modal)
return FALSE;
global->has_modal = meta_plugin_begin_modal (global->plugin, options, timestamp);
if (!meta_is_wayland_compositor ())
sync_input_region (global);
return global->has_modal;
}
/**
* shell_global_end_modal:
* @global: a #ShellGlobal
*
* Undoes the effect of shell_global_begin_modal().
*/
void
shell_global_end_modal (ShellGlobal *global,
guint32 timestamp)
{
if (!global->has_modal)
return;
meta_plugin_end_modal (global->plugin, timestamp);
global->has_modal = FALSE;
/* If the stage window is unfocused, ensure that there's no
* actor focused on Clutter's side. */
if (!meta_stage_is_focused (global->meta_display))
clutter_stage_set_key_focus (global->stage, NULL);
/* An actor dropped key focus. Focus the default window. */
else if (get_key_focused_actor (global) && meta_stage_is_focused (global->meta_display))
meta_display_focus_default_window (global->meta_display,
get_current_time_maybe_roundtrip (global));
if (!meta_is_wayland_compositor ())
sync_input_region (global);
}
/* Code to close all file descriptors before we exec; copied from gspawn.c in GLib.
*
* Authors: Padraig O'Briain, Matthias Clasen, Lennart Poettering
*
* http://bugzilla.gnome.org/show_bug.cgi?id=469231
* http://bugzilla.gnome.org/show_bug.cgi?id=357585
*/
static int
set_cloexec (void *data, gint fd)
{
if (fd >= GPOINTER_TO_INT (data))
fcntl (fd, F_SETFD, FD_CLOEXEC);
return 0;
}
#ifndef HAVE_FDWALK
static int
fdwalk (int (*cb)(void *data, int fd), void *data)
{
gint open_max;
gint fd;
gint res = 0;
#ifdef HAVE_SYS_RESOURCE_H
struct rlimit rl;
#endif
#ifdef __linux__
DIR *d;
if ((d = opendir("/proc/self/fd"))) {
struct dirent *de;
while ((de = readdir(d))) {
glong l;
gchar *e = NULL;
if (de->d_name[0] == '.')
continue;
errno = 0;
l = strtol(de->d_name, &e, 10);
if (errno != 0 || !e || *e)
continue;
fd = (gint) l;
if ((glong) fd != l)
continue;
if (fd == dirfd(d))
continue;
if ((res = cb (data, fd)) != 0)
break;
}
closedir(d);
return res;
}
/* If /proc is not mounted or not accessible we fall back to the old
* rlimit trick */
#endif
#ifdef HAVE_SYS_RESOURCE_H
if (getrlimit(RLIMIT_NOFILE, &rl) == 0 && rl.rlim_max != RLIM_INFINITY)
open_max = rl.rlim_max;
else
#endif
open_max = sysconf (_SC_OPEN_MAX);
for (fd = 0; fd < open_max; fd++)
if ((res = cb (data, fd)) != 0)
break;
return res;
}
#endif
static void
pre_exec_close_fds(void)
{
fdwalk (set_cloexec, GINT_TO_POINTER(3));
}
/**
* shell_global_reexec_self:
* @global: A #ShellGlobal
*
* Restart the current process. Only intended for development purposes.
*/
void
shell_global_reexec_self (ShellGlobal *global)
{
GPtrArray *arr;
gsize len;
#if defined __linux__ || defined __sun
char *buf;
char *buf_p;
char *buf_end;
GError *error = NULL;
if (!g_file_get_contents ("/proc/self/cmdline", &buf, &len, &error))
{
g_warning ("failed to get /proc/self/cmdline: %s", error->message);
return;
}
buf_end = buf+len;
arr = g_ptr_array_new ();
/* The cmdline file is NUL-separated */
for (buf_p = buf; buf_p < buf_end; buf_p = buf_p + strlen (buf_p) + 1)
g_ptr_array_add (arr, buf_p);
g_ptr_array_add (arr, NULL);
#elif defined __OpenBSD__
gchar **args, **args_p;
gint mib[] = { CTL_KERN, KERN_PROC_ARGS, getpid(), KERN_PROC_ARGV };
if (sysctl (mib, G_N_ELEMENTS (mib), NULL, &len, NULL, 0) == -1)
return;
args = g_malloc0 (len);
if (sysctl (mib, G_N_ELEMENTS (mib), args, &len, NULL, 0) == -1) {
g_warning ("failed to get command line args: %d", errno);
g_free (args);
return;
}
arr = g_ptr_array_new ();
for (args_p = args; *args_p != NULL; args_p++) {
g_ptr_array_add (arr, *args_p);
}
g_ptr_array_add (arr, NULL);
#elif defined __FreeBSD__
char *buf;
char *buf_p;
char *buf_end;
gint mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_ARGS, getpid() };
if (sysctl (mib, G_N_ELEMENTS (mib), NULL, &len, NULL, 0) == -1)
return;
buf = g_malloc0 (len);
if (sysctl (mib, G_N_ELEMENTS (mib), buf, &len, NULL, 0) == -1) {
g_warning ("failed to get command line args: %d", errno);
g_free (buf);
return;
}
buf_end = buf+len;
arr = g_ptr_array_new ();
/* The value returned by sysctl is NUL-separated */
for (buf_p = buf; buf_p < buf_end; buf_p = buf_p + strlen (buf_p) + 1)
g_ptr_array_add (arr, buf_p);
g_ptr_array_add (arr, NULL);
#else
return;
#endif
/* Close all file descriptors other than stdin/stdout/stderr, otherwise
* they will leak and stay open after the exec. In particular, this is
* important for file descriptors that represent mapped graphics buffer
* objects.
*/
pre_exec_close_fds ();
meta_display_close (shell_global_get_display (global),
shell_global_get_current_time (global));
execvp (arr->pdata[0], (char**)arr->pdata);
g_warning ("failed to reexec: %s", g_strerror (errno));
g_ptr_array_free (arr, TRUE);
#if defined __linux__ || defined __FreeBSD__
g_free (buf);
#elif defined __OpenBSD__
g_free (args);
#endif
}
/**
* shell_global_notify_error:
* @global: a #ShellGlobal
* @msg: Error message
* @details: Error details
*
* Show a system error notification. Use this function
* when a user-initiated action results in a non-fatal problem
* from causes that may not be under system control. For
* example, an application crash.
*/
void
shell_global_notify_error (ShellGlobal *global,
const char *msg,
const char *details)
{
g_signal_emit_by_name (global, "notify-error", msg, details);
}
/**
* shell_global_get_pointer:
* @global: the #ShellGlobal
* @x: (out): the X coordinate of the pointer, in global coordinates
* @y: (out): the Y coordinate of the pointer, in global coordinates
* @mods: (out): the current set of modifier keys that are pressed down
*
* Gets the pointer coordinates and current modifier key state.
*/
void
shell_global_get_pointer (ShellGlobal *global,
int *x,
int *y,
ClutterModifierType *mods)
{
ClutterModifierType raw_mods;
MetaCursorTracker *tracker;
tracker = meta_cursor_tracker_get_for_display (global->meta_display);
meta_cursor_tracker_get_pointer (tracker, x, y, &raw_mods);
*mods = raw_mods & CLUTTER_MODIFIER_MASK;
}
/**
* shell_global_sync_pointer:
* @global: the #ShellGlobal
*
* Ensures that clutter is aware of the current pointer position,
* causing enter and leave events to be emitted if the pointer moved
* behind our back (ie, during a pointer grab).
*/
void
shell_global_sync_pointer (ShellGlobal *global)
{
int x, y;
ClutterModifierType mods;
ClutterMotionEvent event;
shell_global_get_pointer (global, &x, &y, &mods);
event.type = CLUTTER_MOTION;
event.time = shell_global_get_current_time (global);
event.flags = CLUTTER_EVENT_FLAG_SYNTHETIC;
event.stage = global->stage;
event.x = x;
event.y = y;
event.modifier_state = mods;
event.axes = NULL;
event.device = clutter_device_manager_get_device (clutter_device_manager_get_default (),
META_VIRTUAL_CORE_POINTER_ID);
/* Leaving event.source NULL will force clutter to look it up, which
* will generate enter/leave events as a side effect, if they are
* needed. We need a better way to do this though... see
* http://bugzilla.clutter-project.org/show_bug.cgi?id=2615.
*/
event.source = NULL;
clutter_event_put ((ClutterEvent *)&event);
}
/**
* shell_global_get_settings:
* @global: A #ShellGlobal
*
* Get the global GSettings instance.
*
* Return value: (transfer none): The GSettings object
*/
GSettings *
shell_global_get_settings (ShellGlobal *global)
{
return global->settings;
}
/**
* shell_global_get_current_time:
* @global: A #ShellGlobal
*
* Returns: the current X server time from the current Clutter, Gdk, or X
* event. If called from outside an event handler, this may return
* %Clutter.CURRENT_TIME (aka 0), or it may return a slightly
* out-of-date timestamp.
*/
guint32
shell_global_get_current_time (ShellGlobal *global)
{
guint32 time;
/* meta_display_get_current_time() will return the correct time
when handling an X or Gdk event, but will return CurrentTime
from some Clutter event callbacks.
clutter_get_current_event_time() will return the correct time
from a Clutter event callback, but may return CLUTTER_CURRENT_TIME
timestamp if called at other times.
So we try meta_display_get_current_time() first, since we
can recognize a "wrong" answer from that, and then fall back
to clutter_get_current_event_time().
*/
time = meta_display_get_current_time (global->meta_display);
if (time != CLUTTER_CURRENT_TIME)
return time;
return clutter_get_current_event_time ();
}
/**
* shell_global_create_app_launch_context:
* @global: A #ShellGlobal
* @timestamp: the timestamp for the launch (or 0 for current time)
* @workspace: a workspace index, or -1 to indicate the current one
*
* Create a #GAppLaunchContext set up with the correct timestamp, and
* targeted to activate on the current workspace.
*
* Return value: (transfer full): A new #GAppLaunchContext
*/
GAppLaunchContext *
shell_global_create_app_launch_context (ShellGlobal *global,
guint32 timestamp,
int workspace)
{
MetaWorkspaceManager *workspace_manager = global->workspace_manager;
MetaStartupNotification *sn;
MetaLaunchContext *context;
MetaWorkspace *ws = NULL;
sn = meta_display_get_startup_notification (global->meta_display);
context = meta_startup_notification_create_launcher (sn);
if (timestamp == 0)
timestamp = shell_global_get_current_time (global);
meta_launch_context_set_timestamp (context, timestamp);
if (workspace < 0)
ws = meta_workspace_manager_get_active_workspace (workspace_manager);
else
ws = meta_workspace_manager_get_workspace_by_index (workspace_manager, workspace);
meta_launch_context_set_workspace (context, ws);
return (GAppLaunchContext *) context;
}
typedef struct
{
ShellLeisureFunction func;
gpointer user_data;
GDestroyNotify notify;
} LeisureClosure;
static gboolean
run_leisure_functions (gpointer data)
{
ShellGlobal *global = data;
GSList *closures;
GSList *iter;
global->leisure_function_id = 0;
/* We started more work since we scheduled the idle */
if (global->work_count > 0)
return FALSE;
/* No leisure closures, so we are done */
if (global->leisure_closures == NULL)
return FALSE;
closures = global->leisure_closures;
global->leisure_closures = NULL;
for (iter = closures; iter; iter = iter->next)
{
LeisureClosure *closure = closures->data;
closure->func (closure->user_data);
if (closure->notify)
closure->notify (closure->user_data);
g_slice_free (LeisureClosure, closure);
}
g_slist_free (closures);
return FALSE;
}
static void
schedule_leisure_functions (ShellGlobal *global)
{
/* This is called when we think we are ready to run leisure functions
* by our own accounting. We try to handle other types of business
* (like ClutterAnimation) by adding a low priority idle function.
*
* This won't work properly if the mainloop goes idle waiting for
* the vertical blanking interval or waiting for work being done
* in another thread.
*/
if (!global->leisure_function_id)
{
global->leisure_function_id = g_idle_add_full (G_PRIORITY_LOW,
run_leisure_functions,
global, NULL);
g_source_set_name_by_id (global->leisure_function_id, "[gnome-shell] run_leisure_functions");
}
}
/**
* shell_global_begin_work:
* @global: the #ShellGlobal
*
* Marks that we are currently doing work. This is used to to track
* whether we are busy for the purposes of shell_global_run_at_leisure().
* A count is kept and shell_global_end_work() must be called exactly
* as many times as shell_global_begin_work().
*/
void
shell_global_begin_work (ShellGlobal *global)
{
global->work_count++;
}
/**
* shell_global_end_work:
* @global: the #ShellGlobal
*
* Marks the end of work that we started with shell_global_begin_work().
* If no other work is ongoing and functions have been added with
* shell_global_run_at_leisure(), they will be run at the next
* opportunity.
*/
void
shell_global_end_work (ShellGlobal *global)
{
g_return_if_fail (global->work_count > 0);
global->work_count--;
if (global->work_count == 0)
schedule_leisure_functions (global);
}
/**
* shell_global_run_at_leisure:
* @global: the #ShellGlobal
* @func: function to call at leisure
* @user_data: data to pass to @func
* @notify: function to call to free @user_data
*
* Schedules a function to be called the next time the shell is idle.
* Idle means here no animations, no redrawing, and no ongoing background
* work. Since there is currently no way to hook into the Clutter master
* clock and know when is running, the implementation here is somewhat
* approximation. Animations done through the shell's Tweener module will
* be handled properly, but other animations may be detected as terminating
* early if they can be drawn fast enough so that the event loop goes idle
* between frames.
*
* The intent of this function is for performance measurement runs
* where a number of actions should be run serially and each action is
* timed individually. Using this function for other purposes will
* interfere with the ability to use it for performance measurement so
* should be avoided.
*/
void
shell_global_run_at_leisure (ShellGlobal *global,
ShellLeisureFunction func,
gpointer user_data,
GDestroyNotify notify)
{
LeisureClosure *closure = g_slice_new (LeisureClosure);
closure->func = func;
closure->user_data = user_data;
closure->notify = notify;
global->leisure_closures = g_slist_append (global->leisure_closures,
closure);
if (global->work_count == 0)
schedule_leisure_functions (global);
}
const char *
shell_global_get_session_mode (ShellGlobal *global)
{
g_return_val_if_fail (SHELL_IS_GLOBAL (global), "user");
return global->session_mode;
}
static void
delete_variant_cb (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
ShellGlobal *global = user_data;
GError *error = NULL;
if (!g_file_delete_finish (G_FILE (object), result, &error))
{
if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED) &&
!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND))
{
g_warning ("Could not delete runtime/persistent state file: %s\n",
error->message);
}
g_error_free (error);
}
g_hash_table_remove (global->save_ops, object);
}
static void
replace_variant_cb (GObject *object,
GAsyncResult *result,
gpointer user_data)
{
ShellGlobal *global = user_data;
GError *error = NULL;
if (!g_file_replace_contents_finish (G_FILE (object), result, NULL, &error))
{
if (!g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
{
g_warning ("Could not replace runtime/persistent state file: %s\n",
error->message);
}
g_error_free (error);
}
g_hash_table_remove (global->save_ops, object);
}
static void
save_variant (ShellGlobal *global,
GFile *dir,
const char *property_name,
GVariant *variant)
{
GFile *path = g_file_get_child (dir, property_name);
GCancellable *cancellable;
cancellable = g_hash_table_lookup (global->save_ops, path);
g_cancellable_cancel (cancellable);
cancellable = g_cancellable_new ();
g_hash_table_insert (global->save_ops, g_object_ref (path), cancellable);
if (variant == NULL || g_variant_get_data (variant) == NULL)
{
g_file_delete_async (path, G_PRIORITY_DEFAULT, cancellable,
delete_variant_cb, global);
}
else
{
g_file_replace_contents_async (path,
g_variant_get_data (variant),
g_variant_get_size (variant),
NULL, FALSE,
G_FILE_CREATE_REPLACE_DESTINATION,
cancellable, replace_variant_cb, global);
}
g_object_unref (path);
}
static GVariant *
load_variant (GFile *dir,
const char *property_type,
const char *property_name)
{
GVariant *res = NULL;
GMappedFile *mfile;
GFile *path = g_file_get_child (dir, property_name);
char *pathstr;
GError *local_error = NULL;
pathstr = g_file_get_path (path);
mfile = g_mapped_file_new (pathstr, FALSE, &local_error);
if (!mfile)
{
if (!g_error_matches (local_error, G_FILE_ERROR, G_FILE_ERROR_NOENT))
{
g_warning ("Failed to open runtime state: %s", local_error->message);
}
g_clear_error (&local_error);
}
else
{
GBytes *bytes = g_mapped_file_get_bytes (mfile);
res = g_variant_new_from_bytes (G_VARIANT_TYPE (property_type), bytes, FALSE);
g_bytes_unref (bytes);
g_mapped_file_unref (mfile);
}
g_object_unref (path);
g_free (pathstr);
return res;
}
/**
* shell_global_set_runtime_state:
* @global: a #ShellGlobal
* @property_name: Name of the property
* @variant: (nullable): A #GVariant, or %NULL to unset
*
* Change the value of serialized runtime state.
*/
void
shell_global_set_runtime_state (ShellGlobal *global,
const char *property_name,
GVariant *variant)
{
save_variant (global, global->runtime_state_path, property_name, variant);
}
/**
* shell_global_get_runtime_state:
* @global: a #ShellGlobal
* @property_type: Expected data type
* @property_name: Name of the property
*
* The shell maintains "runtime" state which does not persist across
* logout or reboot.
*
* Returns: (transfer floating): The value of a serialized property, or %NULL if none stored
*/
GVariant *
shell_global_get_runtime_state (ShellGlobal *global,
const char *property_type,
const char *property_name)
{
return load_variant (global->runtime_state_path, property_type, property_name);
}
/**
* shell_global_set_persistent_state:
* @global: a #ShellGlobal
* @property_name: Name of the property
* @variant: (nullable): A #GVariant, or %NULL to unset
*
* Change the value of serialized persistent state.
*/
void
shell_global_set_persistent_state (ShellGlobal *global,
const char *property_name,
GVariant *variant)
{
save_variant (global, global->userdatadir_path, property_name, variant);
}
/**
* shell_global_get_persistent_state:
* @global: a #ShellGlobal
* @property_type: Expected data type
* @property_name: Name of the property
*
* The shell maintains "persistent" state which will persist after
* logout or reboot.
*
* Returns: (transfer none): The value of a serialized property, or %NULL if none stored
*/
GVariant *
shell_global_get_persistent_state (ShellGlobal *global,
const char *property_type,
const char *property_name)
{
return load_variant (global->userdatadir_path, property_type, property_name);
}
void
_shell_global_locate_pointer (ShellGlobal *global)
{
g_signal_emit (global, shell_global_signals[LOCATE_POINTER], 0);
}
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