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-rw-r--r--daemon/main.c471
1 files changed, 471 insertions, 0 deletions
diff --git a/daemon/main.c b/daemon/main.c
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+++ b/daemon/main.c
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+/* -*- 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;
+}
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