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+/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
+/* main.c main() for message bus
+ *
+ * Copyright (C) 2003 Red Hat, Inc.
+ *
+ * Licensed under the Academic Free License version 2.1
+ *
+ * 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 "bus.h"
+#include "driver.h"
+#include <dbus/dbus-internals.h>
+#include <dbus/dbus-watch.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <signal.h>
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include "selinux.h"
+
+static BusContext *context;
+
+static int reload_pipe[2];
+#define RELOAD_READ_END 0
+#define RELOAD_WRITE_END 1
+
+static void close_reload_pipe (void);
+
+static void
+signal_handler (int sig)
+{
+
+ switch (sig)
+ {
+#ifdef DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX
+ case SIGIO:
+ /* explicit fall-through */
+#endif /* DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX */
+#ifdef SIGHUP
+ case SIGHUP:
+ {
+ DBusString str;
+ _dbus_string_init_const (&str, "foo");
+ if ((reload_pipe[RELOAD_WRITE_END] > 0) &&
+ !_dbus_write_socket (reload_pipe[RELOAD_WRITE_END], &str, 0, 1))
+ {
+ _dbus_warn ("Unable to write to reload pipe.\n");
+ close_reload_pipe ();
+ }
+ }
+ break;
+#endif
+ }
+}
+
+static void
+usage (void)
+{
+ fprintf (stderr, DAEMON_NAME " [--version] [--session] [--system] [--config-file=FILE] [--print-address[=DESCRIPTOR]] [--print-pid[=DESCRIPTOR]] [--fork] [--nofork] [--introspect]\n");
+ exit (1);
+}
+
+static void
+version (void)
+{
+ printf ("D-Bus Message Bus Daemon %s\n"
+ "Copyright (C) 2002, 2003 Red Hat, Inc., CodeFactory AB, and others\n"
+ "This is free software; see the source for copying conditions.\n"
+ "There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
+ VERSION);
+ exit (0);
+}
+
+static void
+introspect (void)
+{
+ DBusString xml;
+ const char *v_STRING;
+
+ if (!_dbus_string_init (&xml))
+ goto oom;
+
+ if (!bus_driver_generate_introspect_string (&xml))
+ {
+ _dbus_string_free (&xml);
+ goto oom;
+ }
+
+ v_STRING = _dbus_string_get_const_data (&xml);
+ printf ("%s\n", v_STRING);
+
+ exit (0);
+
+ oom:
+ _dbus_warn ("Can not introspect - Out of memory\n");
+ exit (1);
+}
+static void
+check_two_config_files (const DBusString *config_file,
+ const char *extra_arg)
+{
+ if (_dbus_string_get_length (config_file) > 0)
+ {
+ fprintf (stderr, "--%s specified but configuration file %s already requested\n",
+ extra_arg, _dbus_string_get_const_data (config_file));
+ exit (1);
+ }
+}
+
+static void
+check_two_addr_descriptors (const DBusString *addr_fd,
+ const char *extra_arg)
+{
+ if (_dbus_string_get_length (addr_fd) > 0)
+ {
+ fprintf (stderr, "--%s specified but printing address to %s already requested\n",
+ extra_arg, _dbus_string_get_const_data (addr_fd));
+ exit (1);
+ }
+}
+
+static void
+check_two_pid_descriptors (const DBusString *pid_fd,
+ const char *extra_arg)
+{
+ if (_dbus_string_get_length (pid_fd) > 0)
+ {
+ fprintf (stderr, "--%s specified but printing pid to %s already requested\n",
+ extra_arg, _dbus_string_get_const_data (pid_fd));
+ exit (1);
+ }
+}
+
+static dbus_bool_t
+handle_reload_watch (DBusWatch *watch,
+ unsigned int flags,
+ void *data)
+{
+ DBusError error;
+ DBusString str;
+
+ while (!_dbus_string_init (&str))
+ _dbus_wait_for_memory ();
+
+ if ((reload_pipe[RELOAD_READ_END] > 0) &&
+ _dbus_read_socket (reload_pipe[RELOAD_READ_END], &str, 1) != 1)
+ {
+ _dbus_warn ("Couldn't read from reload pipe.\n");
+ close_reload_pipe ();
+ return TRUE;
+ }
+ _dbus_string_free (&str);
+
+ /* this can only fail if we don't understand the config file
+ * or OOM. Either way we should just stick with the currently
+ * loaded config.
+ */
+ dbus_error_init (&error);
+ if (! bus_context_reload_config (context, &error))
+ {
+ _DBUS_ASSERT_ERROR_IS_SET (&error);
+ _dbus_assert (dbus_error_has_name (&error, DBUS_ERROR_FAILED) ||
+ dbus_error_has_name (&error, DBUS_ERROR_NO_MEMORY));
+ _dbus_warn ("Unable to reload configuration: %s\n",
+ error.message);
+ dbus_error_free (&error);
+ }
+ return TRUE;
+}
+
+static dbus_bool_t
+reload_watch_callback (DBusWatch *watch,
+ unsigned int condition,
+ void *data)
+{
+ return dbus_watch_handle (watch, condition);
+}
+
+static void
+setup_reload_pipe (DBusLoop *loop)
+{
+ DBusError error;
+ DBusWatch *watch;
+
+ dbus_error_init (&error);
+
+ if (!_dbus_full_duplex_pipe (&reload_pipe[0], &reload_pipe[1],
+ TRUE, &error))
+ {
+ _dbus_warn ("Unable to create reload pipe: %s\n",
+ error.message);
+ dbus_error_free (&error);
+ exit (1);
+ }
+
+ _dbus_fd_set_close_on_exec (reload_pipe[0]);
+ _dbus_fd_set_close_on_exec (reload_pipe[1]);
+
+ watch = _dbus_watch_new (reload_pipe[RELOAD_READ_END],
+ DBUS_WATCH_READABLE, TRUE,
+ handle_reload_watch, NULL, NULL);
+
+ if (watch == NULL)
+ {
+ _dbus_warn ("Unable to create reload watch: %s\n",
+ error.message);
+ dbus_error_free (&error);
+ exit (1);
+ }
+
+ if (!_dbus_loop_add_watch (loop, watch, reload_watch_callback,
+ NULL, NULL))
+ {
+ _dbus_warn ("Unable to add reload watch to main loop: %s\n",
+ error.message);
+ dbus_error_free (&error);
+ exit (1);
+ }
+
+}
+
+static void
+close_reload_pipe (void)
+{
+ _dbus_close_socket (reload_pipe[RELOAD_READ_END], NULL);
+ reload_pipe[RELOAD_READ_END] = -1;
+
+ _dbus_close_socket (reload_pipe[RELOAD_WRITE_END], NULL);
+ reload_pipe[RELOAD_WRITE_END] = -1;
+}
+
+int
+main (int argc, char **argv)
+{
+ DBusError error;
+ DBusString config_file;
+ DBusString addr_fd;
+ DBusString pid_fd;
+ const char *prev_arg;
+ DBusPipe print_addr_pipe;
+ DBusPipe print_pid_pipe;
+ int i;
+ dbus_bool_t print_address;
+ dbus_bool_t print_pid;
+ int force_fork;
+
+ if (!_dbus_string_init (&config_file))
+ return 1;
+
+ if (!_dbus_string_init (&addr_fd))
+ return 1;
+
+ if (!_dbus_string_init (&pid_fd))
+ return 1;
+
+ print_address = FALSE;
+ print_pid = FALSE;
+ force_fork = FORK_FOLLOW_CONFIG_FILE;
+
+ prev_arg = NULL;
+ i = 1;
+ while (i < argc)
+ {
+ const char *arg = argv[i];
+
+ if (strcmp (arg, "--help") == 0 ||
+ strcmp (arg, "-h") == 0 ||
+ strcmp (arg, "-?") == 0)
+ usage ();
+ else if (strcmp (arg, "--version") == 0)
+ version ();
+ else if (strcmp (arg, "--introspect") == 0)
+ introspect ();
+ else if (strcmp (arg, "--nofork") == 0)
+ force_fork = FORK_NEVER;
+ else if (strcmp (arg, "--fork") == 0)
+ force_fork = FORK_ALWAYS;
+ else if (strcmp (arg, "--system") == 0)
+ {
+ check_two_config_files (&config_file, "system");
+
+ if (!_dbus_append_system_config_file (&config_file))
+ exit (1);
+ }
+ else if (strcmp (arg, "--session") == 0)
+ {
+ check_two_config_files (&config_file, "session");
+
+ if (!_dbus_append_session_config_file (&config_file))
+ exit (1);
+ }
+ else if (strstr (arg, "--config-file=") == arg)
+ {
+ const char *file;
+
+ check_two_config_files (&config_file, "config-file");
+
+ file = strchr (arg, '=');
+ ++file;
+
+ if (!_dbus_string_append (&config_file, file))
+ exit (1);
+ }
+ else if (prev_arg &&
+ strcmp (prev_arg, "--config-file") == 0)
+ {
+ check_two_config_files (&config_file, "config-file");
+
+ if (!_dbus_string_append (&config_file, arg))
+ exit (1);
+ }
+ else if (strcmp (arg, "--config-file") == 0)
+ ; /* wait for next arg */
+ else if (strstr (arg, "--print-address=") == arg)
+ {
+ const char *desc;
+
+ check_two_addr_descriptors (&addr_fd, "print-address");
+
+ desc = strchr (arg, '=');
+ ++desc;
+
+ if (!_dbus_string_append (&addr_fd, desc))
+ exit (1);
+
+ print_address = TRUE;
+ }
+ else if (prev_arg &&
+ strcmp (prev_arg, "--print-address") == 0)
+ {
+ check_two_addr_descriptors (&addr_fd, "print-address");
+
+ if (!_dbus_string_append (&addr_fd, arg))
+ exit (1);
+
+ print_address = TRUE;
+ }
+ else if (strcmp (arg, "--print-address") == 0)
+ print_address = TRUE; /* and we'll get the next arg if appropriate */
+ else if (strstr (arg, "--print-pid=") == arg)
+ {
+ const char *desc;
+
+ check_two_pid_descriptors (&pid_fd, "print-pid");
+
+ desc = strchr (arg, '=');
+ ++desc;
+
+ if (!_dbus_string_append (&pid_fd, desc))
+ exit (1);
+
+ print_pid = TRUE;
+ }
+ else if (prev_arg &&
+ strcmp (prev_arg, "--print-pid") == 0)
+ {
+ check_two_pid_descriptors (&pid_fd, "print-pid");
+
+ if (!_dbus_string_append (&pid_fd, arg))
+ exit (1);
+
+ print_pid = TRUE;
+ }
+ else if (strcmp (arg, "--print-pid") == 0)
+ print_pid = TRUE; /* and we'll get the next arg if appropriate */
+ else
+ usage ();
+
+ prev_arg = arg;
+
+ ++i;
+ }
+
+ if (_dbus_string_get_length (&config_file) == 0)
+ {
+ fprintf (stderr, "No configuration file specified.\n");
+ usage ();
+ }
+
+ _dbus_pipe_invalidate (&print_addr_pipe);
+ if (print_address)
+ {
+ _dbus_pipe_init_stdout (&print_addr_pipe);
+ if (_dbus_string_get_length (&addr_fd) > 0)
+ {
+ long val;
+ int end;
+ if (!_dbus_string_parse_int (&addr_fd, 0, &val, &end) ||
+ end != _dbus_string_get_length (&addr_fd) ||
+ val < 0 || val > _DBUS_INT_MAX)
+ {
+ fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
+ _dbus_string_get_const_data (&addr_fd));
+ exit (1);
+ }
+
+ _dbus_pipe_init (&print_addr_pipe, val);
+ }
+ }
+ _dbus_string_free (&addr_fd);
+
+ _dbus_pipe_invalidate (&print_pid_pipe);
+ if (print_pid)
+ {
+ _dbus_pipe_init_stdout (&print_pid_pipe);
+ if (_dbus_string_get_length (&pid_fd) > 0)
+ {
+ long val;
+ int end;
+ if (!_dbus_string_parse_int (&pid_fd, 0, &val, &end) ||
+ end != _dbus_string_get_length (&pid_fd) ||
+ val < 0 || val > _DBUS_INT_MAX)
+ {
+ fprintf (stderr, "Invalid file descriptor: \"%s\"\n",
+ _dbus_string_get_const_data (&pid_fd));
+ exit (1);
+ }
+
+ _dbus_pipe_init (&print_pid_pipe, val);
+ }
+ }
+ _dbus_string_free (&pid_fd);
+
+ if (!bus_selinux_pre_init ())
+ {
+ _dbus_warn ("SELinux pre-initialization failed\n");
+ exit (1);
+ }
+
+ dbus_error_init (&error);
+ context = bus_context_new (&config_file, force_fork,
+ &print_addr_pipe, &print_pid_pipe,
+ &error);
+ _dbus_string_free (&config_file);
+ if (context == NULL)
+ {
+ _dbus_warn ("Failed to start message bus: %s\n",
+ error.message);
+ dbus_error_free (&error);
+ exit (1);
+ }
+
+ /* bus_context_new() closes the print_addr_pipe and
+ * print_pid_pipe
+ */
+
+ setup_reload_pipe (bus_context_get_loop (context));
+
+#ifdef SIGHUP
+ _dbus_set_signal_handler (SIGHUP, signal_handler);
+#endif
+#ifdef DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX
+ _dbus_set_signal_handler (SIGIO, signal_handler);
+#endif /* DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX */
+
+ _dbus_verbose ("We are on D-Bus...\n");
+ _dbus_loop_run (bus_context_get_loop (context));
+
+ bus_context_shutdown (context);
+ bus_context_unref (context);
+ bus_selinux_shutdown ();
+
+ return 0;
+}
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