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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
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* Copyright (C) 2007 William Jon McCann <mccann@jhu.edu>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include <sys/types.h>
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#include <glib/gi18n.h>
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#include <glib/gstdio.h>
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#include <glib-object.h>
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#include "gdm-manager.h"
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#include "gdm-common.h"
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#include "gdm-signal-handler.h"
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#include "gdm-settings.h"
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#include "gdm-settings-direct.h"
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#include "gdm-settings-keys.h"
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#define GDM_DBUS_NAME "org.gnome.DisplayManager"
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static GDBusConnection *get_system_bus (void);
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static gboolean bus_reconnect (void);
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extern char **environ;
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static GdmManager *manager = NULL;
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static int name_id = -1;
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static GdmSettings *settings = NULL;
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static uid_t gdm_uid = -1;
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static gid_t gdm_gid = -1;
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timed_exit_cb (GMainLoop *loop)
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g_main_loop_quit (loop);
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bus_connection_closed (void)
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g_debug ("Disconnected from D-Bus");
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if (manager == NULL) {
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/* probably shutting down or something */
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g_clear_object (&manager);
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g_timeout_add_seconds (3, (GSourceFunc)bus_reconnect, NULL);
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static GDBusConnection *
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bus = g_bus_get_sync (G_BUS_TYPE_SYSTEM, NULL, &error);
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g_warning ("Couldn't connect to system bus: %s",
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g_signal_connect (bus, "closed",
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G_CALLBACK (bus_connection_closed), NULL);
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g_dbus_connection_set_exit_on_close (bus, FALSE);
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g_unlink (GDM_PID_FILE);
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pf = open (GDM_PID_FILE, O_WRONLY|O_CREAT|O_TRUNC|O_EXCL, 0644);
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g_warning (_("Cannot write PID file %s: possibly out of disk space: %s"),
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snprintf (pid, sizeof (pid), "%lu\n", (long unsigned) getpid ());
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written = write (pf, pid, strlen (pid));
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g_warning (_("Cannot write PID file %s: possibly out of disk space: %s"),
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const char *log_path;
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r = g_stat (log_path, &statbuf);
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if (r < 0 || ! S_ISDIR (statbuf.st_mode)) {
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if (g_mkdir (log_path, 0755) < 0) {
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gdm_fail (_("Logdir %s does not exist or isn't a directory."),
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g_chmod (log_path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
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check_servauthdir (const char *auth_path,
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struct stat *statbuf)
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/* Enter paranoia mode */
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r = g_stat (auth_path, statbuf);
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gdm_fail (_("Authdir %s does not exist. Aborting."), auth_path);
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if (! S_ISDIR (statbuf->st_mode)) {
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gdm_fail (_("Authdir %s is not a directory. Aborting."), auth_path);
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set_effective_user (uid_t uid)
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if (geteuid () != uid) {
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g_error ("Cannot set uid to %d: %s",
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set_effective_group (gid_t gid)
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if (getegid () != gid) {
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g_error ("Cannot set gid to %d: %s",
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set_effective_user_group (uid_t uid,
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set_effective_user (0);
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set_effective_group (gid);
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set_effective_user (0);
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gdm_daemon_check_permissions (uid_t uid,
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const char *auth_path;
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/* Enter paranoia mode */
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check_servauthdir (auth_path, &statbuf);
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set_effective_user_group (0, 0);
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/* Now set things up for us as */
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chown (auth_path, 0, gid);
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g_chmod (auth_path, (S_IRWXU|S_IRWXG|S_ISVTX));
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set_effective_user_group (uid, gid);
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check_servauthdir (auth_path, &statbuf);
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if G_UNLIKELY (statbuf.st_uid != 0 || statbuf.st_gid != gid) {
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gdm_fail (_("Authdir %s is not owned by user %d, group %d. Aborting."),
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if G_UNLIKELY (statbuf.st_mode != (S_IFDIR|S_IRWXU|S_IRWXG|S_ISVTX)) {
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gdm_fail (_("Authdir %s has wrong permissions %o. Should be %o. Aborting."),
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(S_IRWXU|S_IRWXG|S_ISVTX));
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gdm_daemon_change_user (uid_t *uidp,
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struct passwd *pwent;
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gdm_settings_direct_get_string (GDM_KEY_USER, &username);
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gdm_settings_direct_get_string (GDM_KEY_GROUP, &groupname);
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if (username == NULL || groupname == NULL) {
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g_debug ("Changing user:group to %s:%s", username, groupname);
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/* Lookup user and groupid for the GDM user */
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gdm_get_pwent_for_name (username, &pwent);
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/* Set uid and gid */
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if G_UNLIKELY (pwent == NULL) {
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gdm_fail (_("Can't find the GDM user '%s'. Aborting!"), username);
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if G_UNLIKELY (uid == 0) {
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gdm_fail (_("The GDM user should not be root. Aborting!"));
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grent = getgrnam (groupname);
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if G_UNLIKELY (grent == NULL) {
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gdm_fail (_("Can't find the GDM group '%s'. Aborting!"), groupname);
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if G_UNLIKELY (gid == 0) {
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gdm_fail (_("The GDM group should not be root. Aborting!"));
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/* gid remains 'gdm' */
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set_effective_user_group (uid, gid);
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signal_cb (int signo,
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g_debug ("Got callback for signal %d", signo);
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/* let the fatal signals interrupt us */
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g_debug ("Caught signal %d, shutting down abnormally.", signo);
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/* let the fatal signals interrupt us */
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g_debug ("Caught signal %d, shutting down normally.", signo);
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g_debug ("Got HUP signal");
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/* Reread config stuff like system config files, VPN service
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g_object_unref (settings);
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settings = gdm_settings_new ();
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if (settings != NULL) {
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if (! gdm_settings_direct_init (settings, DATADIR "/gdm/gdm.schemas", "/")) {
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g_warning ("Unable to initialize settings");
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g_debug ("Got USR1 signal");
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* Play with log levels or something
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gdm_log_toggle_debug ();
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g_debug ("Caught unhandled signal %d", signo);
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gboolean debug = FALSE;
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/* enable debugging for unstable builds */
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if (gdm_is_version_unstable ()) {
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gdm_settings_direct_get_boolean (GDM_KEY_DEBUG, &debug);
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GMainLoop *main_loop;
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GOptionContext *context;
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GdmSignalHandler *signal_handler;
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static gboolean do_timed_exit = FALSE;
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static gboolean print_version = FALSE;
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static gboolean fatal_warnings = FALSE;
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static GOptionEntry entries [] = {
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{ "fatal-warnings", 0, 0, G_OPTION_ARG_NONE, &fatal_warnings, N_("Make all warnings fatal"), NULL },
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{ "timed-exit", 0, 0, G_OPTION_ARG_NONE, &do_timed_exit, N_("Exit after a time (for debugging)"), NULL },
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{ "version", 0, 0, G_OPTION_ARG_NONE, &print_version, N_("Print GDM version"), NULL },
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bindtextdomain (GETTEXT_PACKAGE, GNOMELOCALEDIR);
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textdomain (GETTEXT_PACKAGE);
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setlocale (LC_ALL, "");
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context = g_option_context_new (_("GNOME Display Manager"));
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g_option_context_add_main_entries (context, entries, NULL);
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g_option_context_set_ignore_unknown_options (context, TRUE);
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res = g_option_context_parse (context, &argc, &argv, &error);
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g_option_context_free (context);
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g_warning ("%s", error->message);
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g_error_free (error);
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g_print ("GDM %s\n", VERSION);
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if (fatal_warnings) {
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GLogLevelFlags fatal_mask;
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fatal_mask = g_log_set_always_fatal (G_LOG_FATAL_MASK);
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fatal_mask |= G_LOG_LEVEL_WARNING | G_LOG_LEVEL_CRITICAL;
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g_log_set_always_fatal (fatal_mask);
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settings = gdm_settings_new ();
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if (settings == NULL) {
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g_warning ("Unable to initialize settings");
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if (! gdm_settings_direct_init (settings, DATADIR "/gdm/gdm.schemas", "/")) {
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g_warning ("Unable to initialize settings");
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gdm_log_set_debug (is_debug_set ());
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gdm_daemon_change_user (&gdm_uid, &gdm_gid);
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gdm_daemon_check_permissions (gdm_uid, gdm_gid);
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set_effective_user_group (0, 0);
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/* XDM compliant error message */
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if (getuid () != 0) {
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/* make sure the pid file doesn't get wiped */
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g_warning (_("Only the root user can run GDM"));
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/* Connect to the bus, own the name and start the manager */
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main_loop = g_main_loop_new (NULL, FALSE);
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signal_handler = gdm_signal_handler_new ();
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gdm_signal_handler_set_fatal_func (signal_handler,
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(GDestroyNotify)g_main_loop_quit,
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gdm_signal_handler_add_fatal (signal_handler);
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gdm_signal_handler_add (signal_handler, SIGTERM, signal_cb, NULL);
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gdm_signal_handler_add (signal_handler, SIGINT, signal_cb, NULL);
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gdm_signal_handler_add (signal_handler, SIGFPE, signal_cb, NULL);
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gdm_signal_handler_add (signal_handler, SIGHUP, signal_cb, NULL);
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gdm_signal_handler_add (signal_handler, SIGUSR1, signal_cb, NULL);
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g_timeout_add_seconds (30, (GSourceFunc) timed_exit_cb, main_loop);
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g_main_loop_run (main_loop);
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g_debug ("GDM finished, cleaning up...");
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g_clear_object (&manager);
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g_clear_object (&settings);
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g_clear_object (&signal_handler);
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gdm_settings_direct_shutdown ();
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g_main_loop_unref (main_loop);
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on_name_acquired (GDBusConnection *bus,
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gboolean xdmcp_enabled;
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gboolean show_local_greeter;
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manager = gdm_manager_new ();
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if (manager == NULL) {
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g_warning ("Could not construct manager object");
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g_debug ("Successfully connected to D-Bus");
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gdm_manager_start (manager);
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show_local_greeter = TRUE;
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gdm_settings_direct_get_boolean (GDM_KEY_SHOW_LOCAL_GREETER, &show_local_greeter);
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gdm_manager_set_show_local_greeter (manager, show_local_greeter);
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xdmcp_enabled = FALSE;
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gdm_settings_direct_get_boolean (GDM_KEY_XDMCP_ENABLE, &xdmcp_enabled);
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gdm_manager_set_xdmcp_enabled (manager, xdmcp_enabled);
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on_name_lost (GDBusConnection *bus,
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g_debug ("Lost GDM name on bus");
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bus_connection_closed ();
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GDBusConnection *bus;
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bus = get_system_bus ();
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name_id = g_bus_own_name_on_connection (bus,
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G_BUS_NAME_OWNER_FLAGS_NONE,
added
removed
.pc/ubuntu_ensure_dirs.patch/daemon/main.c
