[spice-gtk 2/2] Block ctrl+alt+del if the corresponding property is set

[Christophe Fergeau <cfergeau@xxxxxxxxxx>]

---
 gtk/spice-widget.c |   38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/gtk/spice-widget.c b/gtk/spice-widget.c
index 02bb089..e5c48ed 100644
--- a/gtk/spice-widget.c
+++ b/gtk/spice-widget.c
@@ -979,6 +979,33 @@ static gboolean expose_event(GtkWidget *widget, GdkEventExpose *expose)
 #endif
 
 /* ---------------------------------------------------------------- */
+static gboolean is_key_pressed(SpiceDisplay *display, int scancode)
+{
+    uint32_t i, b, m;
+    SpiceDisplayPrivate *d = SPICE_DISPLAY_GET_PRIVATE(display);
+
+    i = scancode / 32;
+    b = scancode % 32;
+    m = (1 << b);
+    g_return_val_if_fail(i < SPICE_N_ELEMENTS(d->key_state), FALSE);
+
+    return (d->key_state[i] & m);
+}
+
+static gboolean check_for_ctrl_alt_del(SpiceDisplay *display, int scancode)
+{
+    /* we need to look at hardware scancodes for ctrl+alt+del detection
+     * since the symbolic keys sent by gtk+ might have been remapped on the
+     * client side, which means ctrl+alt+del on the client and ctrl+alt+del
+     * on the guest might not correspond to the same physical keyboard keys
+     */
+    if (is_key_pressed(display, 0x1d) || is_key_pressed(display, 0x11d)) /* ctrl */
+        if (is_key_pressed(display, 0x38) || is_key_pressed(display, 0x138)) /* alt */
+            if ((scancode == 0x53) || (scancode == 0x153)) /* DEL or keypad . */
+                return true;
+
+    return false;
+}
 
 static void send_key(SpiceDisplay *display, int scancode, int down)
 {
@@ -1087,6 +1114,17 @@ static gboolean key_event(GtkWidget *widget, GdkEventKey *key)
 
     scancode = vnc_display_keymap_gdk2xtkbd(d->keycode_map, d->keycode_maplen,
                                             key->hardware_keycode);
+
+    if (check_for_ctrl_alt_del(SPICE_DISPLAY(widget), scancode)) {
+        if (key->type == GDK_KEY_PRESS) {
+            gboolean disable;
+            g_object_get(G_OBJECT(d->session), "disable-ctrlaltdel",
+                         &disable, NULL);
+            if (disable)
+                return true;
+        }
+    }
+
     switch (key->type) {
     case GDK_KEY_PRESS:
         send_key(display, scancode, 1);
-- 
1.7.10.4

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