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-rw-r--r--libgdm/gdm-user-switching.c258
1 files changed, 258 insertions, 0 deletions
diff --git a/libgdm/gdm-user-switching.c b/libgdm/gdm-user-switching.c
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+++ b/libgdm/gdm-user-switching.c
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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2012 Red Hat, Inc.
+ * Copyright (C) 2012 Giovanni Campagna <scampa.giovanni@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib-object.h>
+#include <gio/gio.h>
+
+#include <systemd/sd-login.h>
+
+#include "common/gdm-common.h"
+#include "gdm-user-switching.h"
+#include "gdm-client.h"
+
+static gboolean
+create_transient_display (GDBusConnection *connection,
+ GCancellable *cancellable,
+ GError **error)
+{
+ GVariant *reply;
+ const char *value;
+
+ reply = g_dbus_connection_call_sync (connection,
+ "org.gnome.DisplayManager",
+ "/org/gnome/DisplayManager/LocalDisplayFactory",
+ "org.gnome.DisplayManager.LocalDisplayFactory",
+ "CreateTransientDisplay",
+ NULL, /* parameters */
+ G_VARIANT_TYPE ("(o)"),
+ G_DBUS_CALL_FLAGS_NONE,
+ -1,
+ cancellable, error);
+ if (reply == NULL) {
+ g_prefix_error (error, _("Unable to create transient display: "));
+ return FALSE;
+ }
+
+ g_variant_get (reply, "(&o)", &value);
+ g_debug ("Started %s", value);
+
+ g_variant_unref (reply);
+ return TRUE;
+}
+
+static gboolean
+activate_session_id (GDBusConnection *connection,
+ GCancellable *cancellable,
+ const char *seat_id,
+ const char *session_id,
+ GError **error)
+{
+ GVariant *reply;
+
+ reply = g_dbus_connection_call_sync (connection,
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "ActivateSessionOnSeat",
+ g_variant_new ("(ss)", session_id, seat_id),
+ NULL,
+ G_DBUS_CALL_FLAGS_NONE,
+ -1,
+ cancellable, error);
+ if (reply == NULL) {
+ g_prefix_error (error, _("Unable to activate session: "));
+ return FALSE;
+ }
+
+ g_variant_unref (reply);
+
+ return TRUE;
+}
+
+static gboolean
+get_login_window_session_id (const char *seat_id,
+ char **session_id)
+{
+ gboolean ret;
+ int res, i;
+ char **sessions;
+ char *service_id;
+ char *service_class;
+ char *state;
+
+ res = sd_seat_get_sessions (seat_id, &sessions, NULL, NULL);
+ if (res < 0) {
+ g_debug ("Failed to determine sessions: %s", strerror (-res));
+ return FALSE;
+ }
+
+ if (sessions == NULL || sessions[0] == NULL) {
+ *session_id = NULL;
+ ret = TRUE;
+ goto out;
+ }
+
+ for (i = 0; sessions[i]; i ++) {
+
+ res = sd_session_get_class (sessions[i], &service_class);
+ if (res < 0) {
+ g_debug ("failed to determine class of session %s: %s", sessions[i], strerror (-res));
+ ret = FALSE;
+ goto out;
+ }
+
+ if (strcmp (service_class, "greeter") != 0) {
+ free (service_class);
+ continue;
+ }
+
+ free (service_class);
+
+ ret = sd_session_get_state (sessions[i], &state);
+ if (ret < 0) {
+ g_debug ("failed to determine state of session %s: %s", sessions[i], strerror (-res));
+ ret = FALSE;
+ goto out;
+ }
+
+ if (g_strcmp0 (state, "closing") == 0) {
+ free (state);
+ continue;
+ }
+ free (state);
+
+ res = sd_session_get_service (sessions[i], &service_id);
+ if (res < 0) {
+ g_debug ("failed to determine service of session %s: %s", sessions[i], strerror (-res));
+ ret = FALSE;
+ goto out;
+ }
+
+ if (strcmp (service_id, "gdm-launch-environment") == 0) {
+ *session_id = g_strdup (sessions[i]);
+ ret = TRUE;
+
+ free (service_id);
+ goto out;
+ }
+
+ free (service_id);
+ }
+
+ *session_id = NULL;
+ ret = TRUE;
+
+out:
+ if (sessions) {
+ for (i = 0; sessions[i]; i ++) {
+ free (sessions[i]);
+ }
+
+ free (sessions);
+ }
+
+ return ret;
+}
+
+static gboolean
+goto_login_session (GDBusConnection *connection,
+ GCancellable *cancellable,
+ GError **error)
+{
+ gboolean ret;
+ int res;
+ char *our_session;
+ char *session_id;
+ char *seat_id;
+ GError *local_error = NULL;
+
+ ret = FALSE;
+ session_id = NULL;
+ seat_id = NULL;
+
+ /* First look for any existing LoginWindow sessions on the seat.
+ If none are found, create a new one. */
+
+ /* Note that we mostly use free () here, instead of g_free ()
+ * since the data allocated is from libsystemd-logind, which
+ * does not use GLib's g_malloc (). */
+ if (!gdm_find_display_session (0, getuid (), &our_session, &local_error)) {
+ g_propagate_prefixed_error (error, local_error, _("Could not identify the current session: "));
+
+ return FALSE;
+ }
+
+ res = sd_session_get_seat (our_session, &seat_id);
+ free (our_session);
+ if (res < 0) {
+ g_debug ("failed to determine own seat: %s", strerror (-res));
+ g_set_error (error, GDM_CLIENT_ERROR, 0, _("Could not identify the current seat."));
+
+ return FALSE;
+ }
+
+ res = get_login_window_session_id (seat_id, &session_id);
+ if (res && session_id != NULL) {
+ res = activate_session_id (connection, cancellable, seat_id, session_id, error);
+
+ if (res) {
+ ret = TRUE;
+ }
+ }
+
+ if (! ret && g_strcmp0 (seat_id, "seat0") == 0) {
+ res = create_transient_display (connection, cancellable, error);
+ if (res) {
+ ret = TRUE;
+ }
+ }
+
+ free (seat_id);
+ g_free (session_id);
+
+ return ret;
+}
+
+gboolean
+gdm_goto_login_session_sync (GCancellable *cancellable,
+ GError **error)
+{
+ GDBusConnection *connection;
+ gboolean retval;
+
+ connection = g_bus_get_sync (G_BUS_TYPE_SYSTEM, cancellable, error);
+ if (!connection)
+ return FALSE;
+
+ retval = goto_login_session (connection, cancellable, error);
+
+ g_object_unref (connection);
+ return retval;
+}
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