Adding upstream version 3.38.2.1.upstream/3.38.2.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 471 insertions, 0 deletions

diff --git a/daemon/main.c b/daemon/main.c
new file mode 100644
index 0000000..1b893fe
--- /dev/null
+++ b/daemon/main.c
@@ -0,0 +1,471 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
+ *
+ * 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 <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/wait.h>
+#include <locale.h>
+#include <signal.h>
+
+#include <glib.h>
+#include <glib/gi18n.h>
+#include <glib/gstdio.h>
+#include <glib-object.h>
+#include <gio/gio.h>
+
+#include "gdm-manager.h"
+#include "gdm-log.h"
+#include "gdm-common.h"
+
+#include "gdm-settings.h"
+#include "gdm-settings-direct.h"
+#include "gdm-settings-keys.h"
+
+#define GDM_DBUS_NAME "org.gnome.DisplayManager"
+
+static GDBusConnection *get_system_bus (void);
+static gboolean         bus_reconnect (void);
+
+extern char **environ;
+
+static GdmManager      *manager       = NULL;
+static int              name_id       = -1;
+static GdmSettings     *settings      = NULL;
+static uid_t            gdm_uid       = -1;
+static gid_t            gdm_gid       = -1;
+
+static gboolean
+timed_exit_cb (GMainLoop *loop)
+{
+        g_main_loop_quit (loop);
+        return FALSE;
+}
+
+static void
+bus_connection_closed (void)
+{
+        g_debug ("Disconnected from D-Bus");
+
+        if (manager == NULL) {
+                /* probably shutting down or something */
+                return;
+        }
+
+        g_clear_object (&manager);
+
+        g_timeout_add_seconds (3, (GSourceFunc)bus_reconnect, NULL);
+}
+
+static GDBusConnection *
+get_system_bus (void)
+{
+        GError          *error;
+        GDBusConnection *bus;
+
+        error = NULL;
+        bus = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);
+        if (bus == NULL) {
+                g_warning ("Couldn't connect to system bus: %s",
+                           error->message);
+                g_error_free (error);
+                goto out;
+        }
+
+        g_signal_connect (bus, "closed",
+                          G_CALLBACK (bus_connection_closed), NULL);
+        g_dbus_connection_set_exit_on_close (bus, FALSE);
+
+ out:
+        return bus;
+}
+
+static void
+delete_pid (void)
+{
+        g_unlink (GDM_PID_FILE);
+}
+
+static void
+write_pid (void)
+{
+        int     pf;
+        ssize_t written;
+        char    pid[9];
+
+        errno = 0;
+        pf = open (GDM_PID_FILE, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0644);
+        if (pf < 0) {
+                g_warning (_("Cannot write PID file %s: possibly out of disk space: %s"),
+                           GDM_PID_FILE,
+                           g_strerror (errno));
+
+                return;
+        }
+
+        snprintf (pid, sizeof (pid), "%lu\n", (long unsigned) getpid ());
+        errno = 0;
+        written = write (pf, pid, strlen (pid));
+        close (pf);
+
+        if (written < 0) {
+                g_warning (_("Cannot write PID file %s: possibly out of disk space: %s"),
+                           GDM_PID_FILE,
+                           g_strerror (errno));
+                return;
+        }
+
+        atexit (delete_pid);
+}
+
+static gboolean
+ensure_dir_with_perms (const char *path,
+                       uid_t       uid,
+                       gid_t       gid,
+                       mode_t      mode,
+                       GError    **error)
+{
+        gboolean ret = FALSE;
+
+        if (g_mkdir_with_parents (path, 0755) == -1) {
+                g_set_error_literal (error, G_IO_ERROR, g_io_error_from_errno (errno), g_strerror (errno));
+                goto out;
+        }
+        if (g_chmod (path, mode) == -1) {
+                g_set_error_literal (error, G_IO_ERROR, g_io_error_from_errno (errno), g_strerror (errno));
+                goto out;
+        }
+        if (chown (path, uid, gid) == -1) {
+                g_set_error_literal (error, G_IO_ERROR, g_io_error_from_errno (errno), g_strerror (errno));
+                goto out;
+        }
+
+        ret = TRUE;
+ out:
+        return ret;
+}
+
+static void
+gdm_daemon_ensure_dirs (uid_t uid,
+                        gid_t gid)
+{
+        GError *error = NULL;
+
+        /* Set up /var/run/gdm */
+        if (!ensure_dir_with_perms (GDM_RAN_ONCE_MARKER_DIR, 0, gid, 0711, &error)) {
+                gdm_fail (_("Failed to create ran once marker dir %s: %s"),
+                          GDM_RAN_ONCE_MARKER_DIR, error->message);
+        }
+
+        /* Set up /var/log/gdm */
+        if (!ensure_dir_with_perms (LOGDIR, 0, gid, 0711, &error)) {
+                gdm_fail (_("Failed to create LogDir %s: %s"),
+                          LOGDIR, error->message);
+        }
+}
+
+static void
+gdm_daemon_lookup_user (uid_t *uidp,
+                        gid_t *gidp)
+{
+        char          *username;
+        char          *groupname;
+        uid_t          uid;
+        gid_t          gid;
+        struct passwd *pwent;
+        struct group  *grent;
+
+        username = NULL;
+        groupname = NULL;
+        uid = 0;
+        gid = 0;
+
+        gdm_settings_direct_get_string (GDM_KEY_USER, &username);
+        gdm_settings_direct_get_string (GDM_KEY_GROUP, &groupname);
+
+        if (username == NULL || groupname == NULL) {
+                return;
+        }
+
+        g_debug ("Changing user:group to %s:%s", username, groupname);
+
+        /* Lookup user and groupid for the GDM user */
+        gdm_get_pwent_for_name (username, &pwent);
+
+        /* Set uid and gid */
+        if G_UNLIKELY (pwent == NULL) {
+                gdm_fail (_("Can’t find the GDM user “%s”. Aborting!"), username);
+        } else {
+                uid = pwent->pw_uid;
+        }
+
+        if G_UNLIKELY (uid == 0) {
+                gdm_fail (_("The GDM user should not be root. Aborting!"));
+        }
+
+        grent = getgrnam (groupname);
+
+        if G_UNLIKELY (grent == NULL) {
+                gdm_fail (_("Can’t find the GDM group “%s”. Aborting!"), groupname);
+        } else  {
+                gid = grent->gr_gid;
+        }
+
+        if G_UNLIKELY (gid == 0) {
+                gdm_fail (_("The GDM group should not be root. Aborting!"));
+        }
+
+        if (uidp != NULL) {
+                *uidp = uid;
+        }
+
+        if (gidp != NULL) {
+                *gidp = gid;
+        }
+
+        g_free (username);
+        g_free (groupname);
+}
+
+static gboolean
+on_shutdown_signal_cb (gpointer user_data)
+{
+        GMainLoop *mainloop = user_data;
+
+        g_main_loop_quit (mainloop);
+
+        return FALSE;
+}
+
+static gboolean
+on_sighup_cb (gpointer user_data)
+{
+        g_debug ("Got HUP signal");
+        /* Reread config stuff like system config files, VPN service
+         * files, etc
+         */
+        g_object_unref (settings);
+        settings = gdm_settings_new ();
+        if (settings != NULL) {
+                if (! gdm_settings_direct_init (settings, DATADIR "/gdm/gdm.schemas", "/")) {
+                        g_warning ("Unable to initialize settings");
+                }
+        }
+
+        return TRUE;
+}
+
+static gboolean
+is_debug_set (void)
+{
+        gboolean debug;
+        gdm_settings_direct_get_boolean (GDM_KEY_DEBUG, &debug);
+        return debug;
+}
+
+/* SIGUSR1 is used by the X server to tell us that we're ready, so
+ * block it. We'll unblock it in the worker thread in gdm-server.c
+ */
+static void
+block_sigusr1 (void)
+{
+        sigset_t mask;
+
+        sigemptyset (&mask);
+        sigaddset (&mask, SIGUSR1);
+        sigprocmask (SIG_BLOCK, &mask, NULL);
+}
+
+int
+main (int    argc,
+      char **argv)
+{
+        GMainLoop          *main_loop;
+        GOptionContext     *context;
+        GError             *error = NULL;
+        gboolean            res;
+        static gboolean     do_timed_exit    = FALSE;
+        static gboolean     print_version    = FALSE;
+        static gboolean     fatal_warnings   = FALSE;
+        static GOptionEntry entries []   = {
+                { "fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &fatal_warnings, N_("Make all warnings fatal"), NULL },
+                { "timed-exit", 0, 0, G_OPTION_ARG_NONE, &do_timed_exit, N_("Exit after a time (for debugging)"), NULL },
+                { "version", 0, 0, G_OPTION_ARG_NONE, &print_version, N_("Print GDM version"), NULL },
+
+                { NULL }
+        };
+
+        block_sigusr1 ();
+
+        bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);
+        textdomain (GETTEXT_PACKAGE);
+        setlocale (LC_ALL, "");
+
+        context = g_option_context_new (_("GNOME Display Manager"));
+        g_option_context_add_main_entries (context, entries, NULL);
+
+        error = NULL;
+        res = g_option_context_parse (context, &argc, &argv, &error);
+        g_option_context_free (context);
+        if (! res) {
+                g_printerr ("Failed to parse options: %s\n", error->message);
+                g_error_free (error);
+                return EXIT_FAILURE;
+        }
+
+        if (print_version) {
+                g_print ("GDM %s\n", VERSION);
+                return EXIT_SUCCESS;
+        }
+
+        /* XDM compliant error message */
+        if (getuid () != 0) {
+                /* make sure the pid file doesn't get wiped */
+                g_printerr ("%s\n", _("Only the root user can run GDM"));
+                return EXIT_FAILURE;
+        }
+
+        if (fatal_warnings) {
+                GLogLevelFlags fatal_mask;
+
+                fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
+                fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
+                g_log_set_always_fatal (fatal_mask);
+        }
+
+        gdm_log_init ();
+
+        settings = gdm_settings_new ();
+        if (! gdm_settings_direct_init (settings, DATADIR "/gdm/gdm.schemas", "/")) {
+                g_warning ("Unable to initialize settings");
+                return EXIT_FAILURE;
+        }
+
+        gdm_log_set_debug (is_debug_set ());
+
+        gdm_daemon_lookup_user (&gdm_uid, &gdm_gid);
+
+        gdm_daemon_ensure_dirs (gdm_uid, gdm_gid);
+
+        /* Connect to the bus, own the name and start the manager */
+        bus_reconnect ();
+
+        /* pid file */
+        delete_pid ();
+        write_pid ();
+
+        g_chdir ("/");
+
+        main_loop = g_main_loop_new (NULL, FALSE);
+
+        g_unix_signal_add (SIGTERM, on_shutdown_signal_cb, main_loop);
+        g_unix_signal_add (SIGINT, on_shutdown_signal_cb, main_loop);
+        g_unix_signal_add (SIGHUP, on_sighup_cb, NULL);
+
+        if (do_timed_exit) {
+                g_timeout_add_seconds (30, (GSourceFunc) timed_exit_cb, main_loop);
+        }
+
+        g_main_loop_run (main_loop);
+
+        g_debug ("GDM finished, cleaning up...");
+
+        g_clear_object (&manager);
+        g_clear_object (&settings);
+
+        gdm_settings_direct_shutdown ();
+        gdm_log_shutdown ();
+
+        g_main_loop_unref (main_loop);
+
+        return EXIT_SUCCESS;
+}
+
+static void
+on_name_acquired (GDBusConnection *bus,
+                  const char      *name,
+                  gpointer         user_data)
+{
+        gboolean xdmcp_enabled;
+        gboolean show_local_greeter;
+
+        manager = gdm_manager_new ();
+        if (manager == NULL) {
+                g_warning ("Could not construct manager object");
+                exit (EXIT_FAILURE);
+        }
+
+        g_debug ("Successfully connected to D-Bus");
+
+        show_local_greeter = TRUE;
+        gdm_settings_direct_get_boolean (GDM_KEY_SHOW_LOCAL_GREETER, &show_local_greeter);
+        gdm_manager_set_show_local_greeter (manager, show_local_greeter);
+
+        xdmcp_enabled = FALSE;
+        gdm_settings_direct_get_boolean (GDM_KEY_XDMCP_ENABLE, &xdmcp_enabled);
+        gdm_manager_set_xdmcp_enabled (manager, xdmcp_enabled);
+
+        gdm_manager_start (manager);
+}
+
+static void
+on_name_lost (GDBusConnection *bus,
+              const char      *name,
+              gpointer         user_data)
+{
+        g_debug ("Lost GDM name on bus");
+
+        bus_connection_closed ();
+}
+
+static gboolean
+bus_reconnect ()
+{
+        GDBusConnection *bus;
+        gboolean         ret;
+
+        ret = TRUE;
+
+        bus = get_system_bus ();
+        if (bus == NULL) {
+                goto out;
+        }
+
+        name_id = g_bus_own_name_on_connection (bus,
+                                                GDM_DBUS_NAME,
+                                                G_BUS_NAME_OWNER_FLAGS_NONE,
+                                                on_name_acquired,
+                                                on_name_lost,
+                                                NULL,
+                                                NULL);
+
+        ret = FALSE;
+ out:
+        return ret;
+}