Exemplo n.º 1
0
static int
x_io_error_handler (Display *xdisplay)
{
  verbose ("X IO error\n");
  kill_bus_and_exit ();
  return 0;
}
Exemplo n.º 2
0
int
main (int argc, char **argv)
{
  const char *prev_arg;
  const char *shname;
  const char *runprog = NULL;
  int remaining_args = 0;
  int exit_with_session;
  int exit_with_x11 = FALSE;
  int binary_syntax = FALSE;
  int c_shell_syntax = FALSE;
  int bourne_shell_syntax = FALSE;
  int auto_shell_syntax = FALSE;
  int autolaunch = FALSE;
  int requires_arg = FALSE;
  int close_stderr = FALSE;
  int i;
  int ret;
  int bus_pid_to_launcher_pipe[2];
  int bus_pid_to_babysitter_pipe[2];
  int bus_address_to_launcher_pipe[2];
  char *config_file;
  dbus_bool_t user_bus_supported = FALSE;
  DBusString user_bus;
  const char *error_str;

  exit_with_session = FALSE;
  config_file = NULL;

  /* Ensure that the first three fds are open, to ensure that when we
   * create other file descriptors (for example for epoll, inotify or
   * a socket), they never get assigned as fd 0, 1 or 2. If they were,
   * which could happen if our caller had (incorrectly) closed those
   * standard fds, then we'd start dbus-daemon with those fds closed,
   * which is unexpected and could cause it to misbehave. */
  if (!_dbus_ensure_standard_fds (0, &error_str))
    {
      fprintf (stderr,
               "dbus-launch: fatal error setting up standard fds: %s: %s\n",
               error_str, _dbus_strerror (errno));
      return 1;
    }

  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 (0);
      else if (strcmp (arg, "--auto-syntax") == 0)
        auto_shell_syntax = TRUE;
      else if (strcmp (arg, "-c") == 0 ||
               strcmp (arg, "--csh-syntax") == 0)
        c_shell_syntax = TRUE;
      else if (strcmp (arg, "-s") == 0 ||
               strcmp (arg, "--sh-syntax") == 0)
        bourne_shell_syntax = TRUE;
      else if (strcmp (arg, "--binary-syntax") == 0)
        binary_syntax = TRUE;
      else if (strcmp (arg, "--version") == 0)
        version ();
      else if (strcmp (arg, "--exit-with-session") == 0)
        exit_with_session = TRUE;
      else if (strcmp (arg, "--exit-with-x11") == 0)
        exit_with_x11 = TRUE;
      else if (strcmp (arg, "--close-stderr") == 0)
        close_stderr = TRUE;
      else if (strstr (arg, "--autolaunch=") == arg)
        {
          const char *s;

          if (autolaunch)
            {
              fprintf (stderr, "--autolaunch given twice\n");
              exit (1);
            }
          
          autolaunch = TRUE;

          s = strchr (arg, '=');
          ++s;

          save_machine_uuid (s);
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--autolaunch") == 0)
        {
          if (autolaunch)
            {
              fprintf (stderr, "--autolaunch given twice\n");
              exit (1);
            }
          
          autolaunch = TRUE;

          save_machine_uuid (arg);
	  requires_arg = FALSE;
        }
      else if (strcmp (arg, "--autolaunch") == 0)
	requires_arg = TRUE;
      else if (strstr (arg, "--config-file=") == arg)
        {
          const char *file;

          if (config_file != NULL)
            {
              fprintf (stderr, "--config-file given twice\n");
              exit (1);
            }
          
          file = strchr (arg, '=');
          ++file;

          config_file = xstrdup (file);
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--config-file") == 0)
        {
          if (config_file != NULL)
            {
              fprintf (stderr, "--config-file given twice\n");
              exit (1);
            }

          config_file = xstrdup (arg);
	  requires_arg = FALSE;
        }
      else if (strcmp (arg, "--config-file") == 0)
	requires_arg = TRUE;
      else if (arg[0] == '-')
        {
          if (strcmp (arg, "--") != 0)
            {
              fprintf (stderr, "Option `%s' is unknown.\n", arg);
              exit (1);
            }
          else
            {
              runprog = argv[i+1];
              remaining_args = i+2;
              break;
            }
        }
      else
	{
	  runprog = arg;
	  remaining_args = i+1;
	  break;
	}
      
      prev_arg = arg;
      
      ++i;
    }
  if (requires_arg)
    {
      fprintf (stderr, "Option `%s' requires an argument.\n", prev_arg);
      exit (1);
    }

  if (auto_shell_syntax)
    {
      if ((shname = getenv ("SHELL")) != NULL)
       {
         if (!strncmp (shname + strlen (shname) - 3, "csh", 3))
           c_shell_syntax = TRUE;
         else
           bourne_shell_syntax = TRUE;
       }
      else
       bourne_shell_syntax = TRUE;
    }  

  if (exit_with_session)
    verbose ("--exit-with-session enabled\n");

  if (exit_with_x11)
    verbose ("--exit-with-x11 enabled\n");

  if (autolaunch)
    {      
#ifndef DBUS_BUILD_X11
      fprintf (stderr, "Autolaunch requested, but X11 support not compiled in.\n"
	       "Cannot continue.\n");
      exit (1);
#else /* DBUS_BUILD_X11 */
      fprintf (stderr, "X11 autolaunch support disabled at compile time.\n");
      exit (1);
#endif /* DBUS_BUILD_X11 */
    }
  else if (exit_with_x11)
    {
#ifndef DBUS_BUILD_X11
      fprintf (stderr, "Session lifetime based on X11 requested, but X11 support not compiled in.\n");
      exit (1);
#else /* DBUS_BUILD_X11 */
      if (!read_machine_uuid_if_needed())
        {
          fprintf (stderr, "Session lifetime based on X11 requested, but machine UUID unavailable.\n");
          exit (1);
        }

      if (!x11_init ())
        {
          fprintf (stderr, "Session lifetime based on X11 requested, but X11 initialization failed.\n");
          exit (1);
        }
#endif /* DBUS_BUILD_X11 */
    }
#ifdef DBUS_BUILD_X11
  else if (read_machine_uuid_if_needed())
    {
      x11_init();
    }
#endif /* DBUS_BUILD_X11 */


  if (pipe (bus_pid_to_launcher_pipe) < 0 ||
      pipe (bus_address_to_launcher_pipe) < 0 ||
      pipe (bus_pid_to_babysitter_pipe) < 0)
    {
      fprintf (stderr,
               "Failed to create pipe: %s\n",
               strerror (errno));
      exit (1);
    }

  ret = fork ();
  if (ret < 0)
    {
      fprintf (stderr, "Failed to fork: %s\n",
               strerror (errno));
      exit (1);
    }

  if (ret == 0)
    {
      /* Child */
#define MAX_FD_LEN 64
      char write_pid_fd_as_string[MAX_FD_LEN];
      char write_address_fd_as_string[MAX_FD_LEN];

#ifdef DBUS_BUILD_X11
      xdisplay = NULL;
#endif

      if (close_stderr)
	do_close_stderr ();

      verbose ("=== Babysitter's intermediate parent created\n");

      /* Fork once more to create babysitter */
      
      ret = fork ();
      if (ret < 0)
        {
          fprintf (stderr, "Failed to fork: %s\n",
                   strerror (errno));
          exit (1);
        }
      
      if (ret > 0)
        {
          /* In babysitter */
          verbose ("=== Babysitter's intermediate parent continues\n");
          
          close (bus_pid_to_launcher_pipe[READ_END]);
	  close (bus_pid_to_launcher_pipe[WRITE_END]);
          close (bus_address_to_launcher_pipe[READ_END]);
          close (bus_address_to_launcher_pipe[WRITE_END]);
          close (bus_pid_to_babysitter_pipe[WRITE_END]);

          /* babysit() will fork *again*
           * and will also reap the pre-forked bus
           * daemon
           */
          babysit (exit_with_session || exit_with_x11, ret,
                   bus_pid_to_babysitter_pipe[READ_END]);
          exit (0);
        }

      verbose ("=== Bus exec process created\n");
      
      /* Now we are the bus process (well, almost;
       * dbus-daemon itself forks again)
       */
      close (bus_pid_to_launcher_pipe[READ_END]);
      close (bus_address_to_launcher_pipe[READ_END]);
      close (bus_pid_to_babysitter_pipe[READ_END]);
      close (bus_pid_to_babysitter_pipe[WRITE_END]);

      /* If we have a user bus and want to use it, do so instead of
       * exec'ing a new dbus-daemon. */
      if (autolaunch && user_bus_supported)
        {
          do_write (bus_pid_to_launcher_pipe[WRITE_END], "0\n", 2);
          close (bus_pid_to_launcher_pipe[WRITE_END]);

          do_write (bus_address_to_launcher_pipe[WRITE_END],
                    _dbus_string_get_const_data (&user_bus),
                    _dbus_string_get_length (&user_bus));
          do_write (bus_address_to_launcher_pipe[WRITE_END], "\n", 1);
          close (bus_address_to_launcher_pipe[WRITE_END]);

          exit (0);
        }

      sprintf (write_pid_fd_as_string,
               "%d", bus_pid_to_launcher_pipe[WRITE_END]);

      sprintf (write_address_fd_as_string,
               "%d", bus_address_to_launcher_pipe[WRITE_END]);

      verbose ("Calling exec()\n");
 
#ifdef DBUS_ENABLE_EMBEDDED_TESTS
      {
        /* exec from testdir */
        const char *test_daemon = getenv ("DBUS_TEST_DAEMON");

        if (test_daemon != NULL)
          {
            if (config_file == NULL && getenv ("DBUS_TEST_DATA") != NULL)
              {
                config_file = concat2 (getenv ("DBUS_TEST_DATA"),
                    "/valid-config-files/session.conf");

                if (config_file == NULL)
                  {
                    fprintf (stderr, "Out of memory\n");
                    exit (1);
                  }
              }

            execl (test_daemon,
                   test_daemon,
                   "--fork",
                   "--print-pid", write_pid_fd_as_string,
                   "--print-address", write_address_fd_as_string,
                   config_file ? "--config-file" : "--session",
                   config_file, /* has to be last in this varargs list */
                   NULL);

            fprintf (stderr,
                     "Failed to execute test message bus daemon %s: %s.\n",
                     test_daemon, strerror (errno));
            exit (1);
          }
      }
 #endif /* DBUS_ENABLE_EMBEDDED_TESTS */

      execl (DBUS_DAEMONDIR"/dbus-daemon",
             DBUS_DAEMONDIR"/dbus-daemon",
             "--fork",
             "--print-pid", write_pid_fd_as_string,
             "--print-address", write_address_fd_as_string,
             config_file ? "--config-file" : "--session",
             config_file, /* has to be last in this varargs list */
             NULL);

      fprintf (stderr,
               "Failed to execute message bus daemon %s: %s.  Will try again without full path.\n",
               DBUS_DAEMONDIR"/dbus-daemon", strerror (errno));
      
      /*
       * If it failed, try running without full PATH.  Note this is needed
       * because the build process builds the run-with-tmp-session-bus.conf
       * file and the dbus-daemon will not be in the install location during
       * build time.
       */
      execlp ("dbus-daemon",
              "dbus-daemon",
              "--fork",
              "--print-pid", write_pid_fd_as_string,
              "--print-address", write_address_fd_as_string,
              config_file ? "--config-file" : "--session",
              config_file, /* has to be last in this varargs list */
              NULL);

      fprintf (stderr,
               "Failed to execute message bus daemon: %s\n",
               strerror (errno));
      exit (1);
    }
  else
    {
      /* Parent */
#define MAX_PID_LEN 64
      pid_t bus_pid;  
      char bus_address[MAX_ADDR_LEN];
      char buf[MAX_PID_LEN];
      char *end;
      long wid = 0;
      long val;

      verbose ("=== Parent dbus-launch continues\n");
      
      close (bus_pid_to_launcher_pipe[WRITE_END]);
      close (bus_address_to_launcher_pipe[WRITE_END]);
      close (bus_pid_to_babysitter_pipe[READ_END]);

      verbose ("Waiting for babysitter's intermediate parent\n");
      
      /* Immediately reap parent of babysitter
       * (which was created just for us to reap)
       */
      if (do_waitpid (ret) < 0)
        {
          fprintf (stderr, "Failed to waitpid() for babysitter intermediate process: %s\n",
                   strerror (errno));
          exit (1);
        }

      verbose ("Reading address from bus\n");
      
      /* Read the pipe data, print, and exit */
      switch (read_line (bus_address_to_launcher_pipe[READ_END],
                         bus_address, MAX_ADDR_LEN))
        {
        case READ_STATUS_OK:
          break;
        case READ_STATUS_EOF:
          fprintf (stderr, "EOF in dbus-launch reading address from bus daemon\n");
          exit (1);
          break;
        case READ_STATUS_ERROR:
          fprintf (stderr, "Error in dbus-launch reading address from bus daemon: %s\n",
                   strerror (errno));
          exit (1);
          break;
        }
        
      close (bus_address_to_launcher_pipe[READ_END]);

      verbose ("Reading PID from daemon\n");
      /* Now read data */
      switch (read_line (bus_pid_to_launcher_pipe[READ_END], buf, MAX_PID_LEN))
	{
	case READ_STATUS_OK:
	  break;
	case READ_STATUS_EOF:
	  fprintf (stderr, "EOF reading PID from bus daemon\n");
	  exit (1);
	  break;
	case READ_STATUS_ERROR:
	  fprintf (stderr, "Error reading PID from bus daemon: %s\n",
		   strerror (errno));
	  exit (1);
	  break;
	}

      end = NULL;
      val = strtol (buf, &end, 0);
      if (buf == end || end == NULL)
	{
	  fprintf (stderr, "Failed to parse bus PID \"%s\": %s\n",
		   buf, strerror (errno));
	  exit (1);
	}

      bus_pid = val;

      /* Have to initialize bus_pid_to_kill ASAP, so that the
         X error callback can kill it if an error happens. */
      bus_pid_to_kill = bus_pid;

      close (bus_pid_to_launcher_pipe[READ_END]);

#ifdef DBUS_ENABLE_X11_AUTOLAUNCH
      if (xdisplay != NULL)
        {
          int ret2;

          verbose("Saving x11 address\n");
          ret2 = x11_save_address (bus_address, bus_pid, &wid);
          /* Only get an existing dbus session when autolaunching */
          if (autolaunch)
            {
              if (ret2 == 0)
                {
                  char *address = NULL;
                  /* another window got added. Return its address */
                  if (x11_get_address (&address, &bus_pid, &wid)
                       && address != NULL)
                    {
                      verbose ("dbus-daemon is already running. Returning existing parameters.\n");
                      /* Kill the old bus */
                      kill_bus();
                      pass_info (runprog, address, bus_pid, wid,
                         c_shell_syntax, bourne_shell_syntax, binary_syntax,
                         argc, argv, remaining_args);
                    }
                  }
              if (ret2 < 0)
                {
                  fprintf (stderr, "Error saving bus information.\n");
                  bus_pid_to_kill = bus_pid;
                  kill_bus_and_exit (1);
                }
            }
        }
#endif

      /* Forward the pid to the babysitter */
      write_pid (bus_pid_to_babysitter_pipe[WRITE_END], bus_pid);
      close (bus_pid_to_babysitter_pipe[WRITE_END]);

       pass_info (runprog, bus_address, bus_pid, wid, c_shell_syntax,
              bourne_shell_syntax, binary_syntax, argc, argv, remaining_args);
    }

  return 0;
}
Exemplo n.º 3
0
static void
kill_bus_when_session_ends (void)
{
  int tty_fd;
  int x_fd;
  fd_set read_set;
  fd_set err_set;
  struct sigaction act;
  sigset_t empty_mask;
  
  /* install SIGHUP handler */
  got_sighup = FALSE;
  sigemptyset (&empty_mask);
  act.sa_handler = signal_handler;
  act.sa_mask    = empty_mask;
  act.sa_flags   = 0;
  sigaction (SIGHUP,  &act, NULL);
  sigaction (SIGTERM,  &act, NULL);
  sigaction (SIGINT,  &act, NULL);
  
#ifdef DBUS_BUILD_X11
  x11_init();
  if (xdisplay != NULL)
    {
      x_fd = ConnectionNumber (xdisplay);
    }
  else
    x_fd = -1;
#else
  x_fd = -1;
#endif

  if (isatty (0))
    tty_fd = 0;
  else
    tty_fd = -1;

  if (x_fd >= 0)
    {
      verbose ("session lifetime is defined by X, not monitoring stdin\n");
      tty_fd = -1;
    }
  else if (tty_fd >= 0)
    {
      verbose ("stdin isatty(), monitoring it\n");
    }
  else
    {
      verbose ("stdin was not a TTY, not monitoring it\n");
    }

  if (tty_fd < 0 && x_fd < 0)
    {
      fprintf (stderr, "No terminal on standard input and no X display; cannot attach message bus to session lifetime\n");
      kill_bus_and_exit (1);
    }
  
  while (TRUE)
    {
#ifdef DBUS_BUILD_X11
      /* Dump events on the floor, and let
       * IO error handler run if we lose
       * the X connection. It's important to
       * run this before going into select() since
       * we might have queued outgoing messages or
       * events.
       */
      x11_handle_event ();
#endif
      
      FD_ZERO (&read_set);
      FD_ZERO (&err_set);

      if (tty_fd >= 0)
        {
          FD_SET (tty_fd, &read_set);
          FD_SET (tty_fd, &err_set);
        }

      if (x_fd >= 0)
        {
          FD_SET (x_fd, &read_set);
          FD_SET (x_fd, &err_set);
        }

      select (MAX (tty_fd, x_fd) + 1,
              &read_set, NULL, &err_set, NULL);

      if (got_sighup)
        {
          verbose ("Got SIGHUP, exiting\n");
          kill_bus_and_exit (0);
        }
      
#ifdef DBUS_BUILD_X11
      /* Events will be processed before we select again
       */
      if (x_fd >= 0)
        verbose ("X fd condition reading = %d error = %d\n",
                 FD_ISSET (x_fd, &read_set),
                 FD_ISSET (x_fd, &err_set));
#endif

      if (tty_fd >= 0)
        {
          if (FD_ISSET (tty_fd, &read_set))
            {
              int bytes_read;
              char discard[512];

              verbose ("TTY ready for reading\n");
              
              bytes_read = read (tty_fd, discard, sizeof (discard));

              verbose ("Read %d bytes from TTY errno = %d\n",
                       bytes_read, errno);
              
              if (bytes_read == 0)
                kill_bus_and_exit (0); /* EOF */
              else if (bytes_read < 0 && errno != EINTR)
                {
                  /* This shouldn't happen I don't think; to avoid
                   * spinning on the fd forever we exit.
                   */
                  fprintf (stderr, "dbus-launch: error reading from stdin: %s\n",
                           strerror (errno));
                  kill_bus_and_exit (0);
                }
            }
          else if (FD_ISSET (tty_fd, &err_set))
            {
              verbose ("TTY has error condition\n");
              
              kill_bus_and_exit (0);
            }
        }
    }
}
Exemplo n.º 4
0
static void
kill_bus_when_session_ends (void)
{
  int tty_fd;
  int x_fd;
  fd_set read_set;
  fd_set err_set;
  int ret;
  struct sigaction act;
  sigset_t empty_mask;
#ifdef DBUS_BUILD_X11
  Display *xdisplay;
#endif
  
  /* install SIGHUP handler */
  got_sighup = FALSE;
  sigemptyset (&empty_mask);
  act.sa_handler = signal_handler;
  act.sa_mask    = empty_mask;
  act.sa_flags   = 0;
  sigaction (SIGHUP,  &act, 0);
  
#ifdef DBUS_BUILD_X11
  xdisplay = XOpenDisplay (NULL);
  if (xdisplay != NULL)
    {
      verbose ("Successfully opened X display\n");
      x_fd = ConnectionNumber (xdisplay);
      XSetIOErrorHandler (x_io_error_handler);
    }
  else
    x_fd = -1;
#else
  verbose ("Compiled without X11 support\n");
  x_fd = -1;
#endif

  if (isatty (0))
    tty_fd = 0;
  else
    tty_fd = -1;

  if (tty_fd >= 0)
    verbose ("stdin isatty(), monitoring it\n");
  else
    verbose ("stdin was not a TTY, not monitoring it\n");  
  
  if (tty_fd < 0 && x_fd < 0)
    {
      fprintf (stderr, "No terminal on standard input and no X display; cannot attach message bus to session lifetime\n");
      exit (1);
    }
  
  while (TRUE)
    {
      FD_ZERO (&read_set);
      FD_ZERO (&err_set);

      if (tty_fd >= 0)
        {
          FD_SET (tty_fd, &read_set);
          FD_SET (tty_fd, &err_set);
        }

      if (x_fd >= 0)
        {
          FD_SET (x_fd, &read_set);
          FD_SET (x_fd, &err_set);
        }
      
      ret = select (MAX (tty_fd, x_fd) + 1,
                    &read_set, NULL, &err_set, NULL);

      if (got_sighup)
        {
          verbose ("Got SIGHUP, exiting\n");
          kill_bus_and_exit ();
        }
      
#ifdef DBUS_BUILD_X11
      /* Dump events on the floor, and let
       * IO error handler run if we lose
       * the X connection
       */
      if (x_fd >= 0)
        verbose ("X fd condition reading = %d error = %d\n",
                 FD_ISSET (x_fd, &read_set),
                 FD_ISSET (x_fd, &err_set));
      
      if (xdisplay != NULL)
        {      
          while (XPending (xdisplay))
            {
              XEvent ignored;
              XNextEvent (xdisplay, &ignored);
            }
        }
#endif

      if (tty_fd >= 0)
        {
          if (FD_ISSET (tty_fd, &read_set))
            {
              int bytes_read;
              char discard[512];

              verbose ("TTY ready for reading\n");
              
              bytes_read = read (tty_fd, discard, sizeof (discard));

              verbose ("Read %d bytes from TTY errno = %d\n",
                       bytes_read, errno);
              
              if (bytes_read == 0)
                kill_bus_and_exit (); /* EOF */
              else if (bytes_read < 0 && errno != EINTR)
                {
                  /* This shouldn't happen I don't think; to avoid
                   * spinning on the fd forever we exit.
                   */
                  fprintf (stderr, "dbus-launch: error reading from stdin: %s\n",
                           strerror (errno));
                  kill_bus_and_exit ();
                }
            }
          else if (FD_ISSET (tty_fd, &err_set))
            {
              verbose ("TTY has error condition\n");
              
              kill_bus_and_exit ();
            }
        }
    }
}
Exemplo n.º 5
0
int
main (int argc, char **argv)
{
  const char *prev_arg;
  const char *shname;
  const char *runprog = NULL;
  int remaining_args = 0;
  int exit_with_session;
  int binary_syntax = FALSE;
  int c_shell_syntax = FALSE;
  int bourne_shell_syntax = FALSE;
  int auto_shell_syntax = FALSE;
  int autolaunch = FALSE;
  int requires_arg = FALSE;
  int close_stderr = FALSE;
  int i;  
  int ret;
  int bus_pid_to_launcher_pipe[2];
  int bus_pid_to_babysitter_pipe[2];
  int bus_address_to_launcher_pipe[2];
  char *config_file;
  
  exit_with_session = FALSE;
  config_file = NULL;
  
  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 (0);
      else if (strcmp (arg, "--auto-syntax") == 0)
        auto_shell_syntax = TRUE;
      else if (strcmp (arg, "-c") == 0 ||
               strcmp (arg, "--csh-syntax") == 0)
        c_shell_syntax = TRUE;
      else if (strcmp (arg, "-s") == 0 ||
               strcmp (arg, "--sh-syntax") == 0)
        bourne_shell_syntax = TRUE;
      else if (strcmp (arg, "--binary-syntax") == 0)
        binary_syntax = TRUE;
      else if (strcmp (arg, "--version") == 0)
        version ();
      else if (strcmp (arg, "--exit-with-session") == 0)
        exit_with_session = TRUE;
      else if (strcmp (arg, "--close-stderr") == 0)
        close_stderr = TRUE;
      else if (strstr (arg, "--autolaunch=") == arg)
        {
          const char *s;

          if (autolaunch)
            {
              fprintf (stderr, "--autolaunch given twice\n");
              exit (1);
            }
          
          autolaunch = TRUE;

          s = strchr (arg, '=');
          ++s;

          save_machine_uuid (s);
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--autolaunch") == 0)
        {
          if (autolaunch)
            {
              fprintf (stderr, "--autolaunch given twice\n");
              exit (1);
            }
          
          autolaunch = TRUE;

          save_machine_uuid (arg);
	  requires_arg = FALSE;
        }
      else if (strcmp (arg, "--autolaunch") == 0)
	requires_arg = TRUE;
      else if (strstr (arg, "--config-file=") == arg)
        {
          const char *file;

          if (config_file != NULL)
            {
              fprintf (stderr, "--config-file given twice\n");
              exit (1);
            }
          
          file = strchr (arg, '=');
          ++file;

          config_file = xstrdup (file);
        }
      else if (prev_arg &&
               strcmp (prev_arg, "--config-file") == 0)
        {
          if (config_file != NULL)
            {
              fprintf (stderr, "--config-file given twice\n");
              exit (1);
            }

          config_file = xstrdup (arg);
	  requires_arg = FALSE;
        }
      else if (strcmp (arg, "--config-file") == 0)
	requires_arg = TRUE;
      else if (arg[0] == '-')
        {
          if (strcmp (arg, "--") != 0)
            {
              fprintf (stderr, "Option `%s' is unknown.\n", arg);
              exit (1);
            }
          else
            {
              runprog = argv[i+1];
              remaining_args = i+2;
              break;
            }
        }
      else
	{
	  runprog = arg;
	  remaining_args = i+1;
	  break;
	}
      
      prev_arg = arg;
      
      ++i;
    }
  if (requires_arg)
    {
      fprintf (stderr, "Option `%s' requires an argument.\n", prev_arg);
      exit (1);
    }

  if (auto_shell_syntax)
    {
      if ((shname = getenv ("SHELL")) != NULL)
       {
         if (!strncmp (shname + strlen (shname) - 3, "csh", 3))
           c_shell_syntax = TRUE;
         else
           bourne_shell_syntax = TRUE;
       }
      else
       bourne_shell_syntax = TRUE;
    }  

  if (exit_with_session)
    verbose ("--exit-with-session enabled\n");

  if (autolaunch)
    {      
#ifndef DBUS_BUILD_X11
      fprintf (stderr, "Autolaunch requested, but X11 support not compiled in.\n"
	       "Cannot continue.\n");
      exit (1);
#else
      char *address;
      pid_t pid;
      long wid;
      
      if (get_machine_uuid () == NULL)
        {
          fprintf (stderr, "Machine UUID not provided as arg to --autolaunch\n");
          exit (1);
        }

      /* FIXME right now autolaunch always does print_variables(), but it should really
       * exec the child program instead if a child program was specified. For now
       * we just exit if this conflict arises.
       */
      if (runprog)
        {
          fprintf (stderr, "Currently --autolaunch does not support running a program\n");
          exit (1);
        }
      
      verbose ("Autolaunch enabled (using X11).\n");
      if (!exit_with_session)
	{
	  verbose ("--exit-with-session automatically enabled\n");
	  exit_with_session = TRUE;
	}

      if (!x11_init ())
	{
	  fprintf (stderr, "Autolaunch error: X11 initialization failed.\n");
	  exit (1);
	}

      if (!x11_get_address (&address, &pid, &wid))
	{
	  fprintf (stderr, "Autolaunch error: X11 communication error.\n");
	  exit (1);
	}

      if (address != NULL)
	{          
	  verbose ("dbus-daemon is already running. Returning existing parameters.\n");
	  print_variables (address, pid, wid, c_shell_syntax,
			   bourne_shell_syntax, binary_syntax);
	  exit (0);
	}
#endif
    }

  if (pipe (bus_pid_to_launcher_pipe) < 0 ||
      pipe (bus_address_to_launcher_pipe) < 0 ||
      pipe (bus_pid_to_babysitter_pipe) < 0)
    {
      fprintf (stderr,
               "Failed to create pipe: %s\n",
               strerror (errno));
      exit (1);
    }

  ret = fork ();
  if (ret < 0)
    {
      fprintf (stderr, "Failed to fork: %s\n",
               strerror (errno));
      exit (1);
    }

  if (ret == 0)
    {
      /* Child */
#define MAX_FD_LEN 64
      char write_pid_fd_as_string[MAX_FD_LEN];
      char write_address_fd_as_string[MAX_FD_LEN];

      if (close_stderr)
	do_close_stderr ();

      verbose ("=== Babysitter's intermediate parent created\n");

      /* Fork once more to create babysitter */
      
      ret = fork ();
      if (ret < 0)
        {
          fprintf (stderr, "Failed to fork: %s\n",
                   strerror (errno));
          exit (1);
        }
      
      if (ret > 0)
        {
          /* In babysitter */
          verbose ("=== Babysitter's intermediate parent continues\n");
          
          close (bus_pid_to_launcher_pipe[READ_END]);
	  close (bus_pid_to_launcher_pipe[WRITE_END]);
          close (bus_address_to_launcher_pipe[READ_END]);
          close (bus_address_to_launcher_pipe[WRITE_END]);
          close (bus_pid_to_babysitter_pipe[WRITE_END]);
          
          /* babysit() will fork *again*
           * and will also reap the pre-forked bus
           * daemon
           */
          babysit (exit_with_session, ret,
                   bus_pid_to_babysitter_pipe[READ_END]);
          exit (0);
        }

      verbose ("=== Bus exec process created\n");
      
      /* Now we are the bus process (well, almost;
       * dbus-daemon itself forks again)
       */
      close (bus_pid_to_launcher_pipe[READ_END]);
      close (bus_address_to_launcher_pipe[READ_END]);
      close (bus_pid_to_babysitter_pipe[READ_END]);
      close (bus_pid_to_babysitter_pipe[WRITE_END]);

      sprintf (write_pid_fd_as_string,
               "%d", bus_pid_to_launcher_pipe[WRITE_END]);

      sprintf (write_address_fd_as_string,
               "%d", bus_address_to_launcher_pipe[WRITE_END]);

      verbose ("Calling exec()\n");
 
#ifdef DBUS_BUILD_TESTS 
      /* exec from testdir */
      if (getenv("DBUS_USE_TEST_BINARY") != NULL)
        {
          execl (TEST_BUS_BINARY,
                 TEST_BUS_BINARY,
                 "--fork",
                 "--print-pid", write_pid_fd_as_string,
                 "--print-address", write_address_fd_as_string,
                 config_file ? "--config-file" : "--session",
                 config_file, /* has to be last in this varargs list */
                 NULL); 

          fprintf (stderr,
                   "Failed to execute test message bus daemon %s: %s. Will try again with the system path.\n",
                   TEST_BUS_BINARY, strerror (errno));
        }
 #endif /* DBUS_BUILD_TESTS */

      execl (DBUS_DAEMONDIR"/dbus-daemon",
             DBUS_DAEMONDIR"/dbus-daemon",
             "--fork",
             "--print-pid", write_pid_fd_as_string,
             "--print-address", write_address_fd_as_string,
             config_file ? "--config-file" : "--session",
             config_file, /* has to be last in this varargs list */
             NULL);

      fprintf (stderr,
               "Failed to execute message bus daemon %s: %s.  Will try again without full path.\n",
               DBUS_DAEMONDIR"/dbus-daemon", strerror (errno));
      
      /*
       * If it failed, try running without full PATH.  Note this is needed
       * because the build process builds the run-with-tmp-session-bus.conf
       * file and the dbus-daemon will not be in the install location during
       * build time.
       */
      execlp ("dbus-daemon",
              "dbus-daemon",
              "--fork",
              "--print-pid", write_pid_fd_as_string,
              "--print-address", write_address_fd_as_string,
              config_file ? "--config-file" : "--session",
              config_file, /* has to be last in this varargs list */
              NULL);

      fprintf (stderr,
               "Failed to execute message bus daemon: %s\n",
               strerror (errno));
      exit (1);
    }
  else
    {
      /* Parent */
#define MAX_PID_LEN 64
      pid_t bus_pid;  
      char bus_address[MAX_ADDR_LEN];
      char buf[MAX_PID_LEN];
      char *end;
      long wid = 0;
      long val;
      int ret2;

      verbose ("=== Parent dbus-launch continues\n");
      
      close (bus_pid_to_launcher_pipe[WRITE_END]);
      close (bus_address_to_launcher_pipe[WRITE_END]);
      close (bus_pid_to_babysitter_pipe[READ_END]);

      verbose ("Waiting for babysitter's intermediate parent\n");
      
      /* Immediately reap parent of babysitter
       * (which was created just for us to reap)
       */
      if (do_waitpid (ret) < 0)
        {
          fprintf (stderr, "Failed to waitpid() for babysitter intermediate process: %s\n",
                   strerror (errno));
          exit (1);
        }

      verbose ("Reading address from bus\n");
      
      /* Read the pipe data, print, and exit */
      switch (read_line (bus_address_to_launcher_pipe[READ_END],
                         bus_address, MAX_ADDR_LEN))
        {
        case READ_STATUS_OK:
          break;
        case READ_STATUS_EOF:
          fprintf (stderr, "EOF in dbus-launch reading address from bus daemon\n");
          exit (1);
          break;
        case READ_STATUS_ERROR:
          fprintf (stderr, "Error in dbus-launch reading address from bus daemon: %s\n",
                   strerror (errno));
          exit (1);
          break;
        }
        
      close (bus_address_to_launcher_pipe[READ_END]);

      verbose ("Reading PID from daemon\n");
      /* Now read data */
      switch (read_line (bus_pid_to_launcher_pipe[READ_END], buf, MAX_PID_LEN))
	{
	case READ_STATUS_OK:
	  break;
	case READ_STATUS_EOF:
	  fprintf (stderr, "EOF reading PID from bus daemon\n");
	  exit (1);
	  break;
	case READ_STATUS_ERROR:
	  fprintf (stderr, "Error reading PID from bus daemon: %s\n",
		   strerror (errno));
	  exit (1);
	  break;
	}

      end = NULL;
      val = strtol (buf, &end, 0);
      if (buf == end || end == NULL)
	{
	  fprintf (stderr, "Failed to parse bus PID \"%s\": %s\n",
		   buf, strerror (errno));
	  exit (1);
	}

      bus_pid = val;

      close (bus_pid_to_launcher_pipe[READ_END]);

#ifdef DBUS_BUILD_X11
      /* FIXME the runprog == NULL is broken - we need to launch the runprog with the existing bus,
       * instead of just doing print_variables() if there's an existing bus.
       */
      if (xdisplay != NULL && runprog == NULL)
        {
          ret2 = x11_save_address (bus_address, bus_pid, &wid);
          if (ret2 == 0)
            {
              /* another window got added. Return its address */
              char *address;
              pid_t pid;
              long wid;
              
              if (x11_get_address (&address, &pid, &wid) && address != NULL)
                {
                  verbose ("dbus-daemon is already running. Returning existing parameters.\n");
                  print_variables (address, pid, wid, c_shell_syntax,
                                   bourne_shell_syntax, binary_syntax);
                  free (address);
                  
                  bus_pid_to_kill = bus_pid;
                  kill_bus_and_exit (0);
                }
              
              /* if failed, fall through */
            }
          if (ret2 <= 0)
            {
              fprintf (stderr, "Error saving bus information.\n");
              bus_pid_to_kill = bus_pid;
              kill_bus_and_exit (1);
            }
        }
#endif

      /* Forward the pid to the babysitter */
      write_pid (bus_pid_to_babysitter_pipe[WRITE_END], bus_pid);
      close (bus_pid_to_babysitter_pipe[WRITE_END]);

      if (runprog)
	{
	  char *envvar;
	  char **args;

	  envvar = malloc (strlen ("DBUS_SESSION_BUS_ADDRESS=") + strlen (bus_address) + 1);
	  args = malloc (sizeof (char *) * ((argc-remaining_args)+2));

	  if (envvar == NULL || args == NULL)
	    goto oom;

	  args[0] = xstrdup (runprog);
	  if (!args[0])
	    goto oom;
	  for (i = 1; i <= (argc-remaining_args); i++)
	    {
	      size_t len = strlen (argv[remaining_args+i-1])+1;
	      args[i] = malloc (len);
	      if (!args[i])
		goto oom;
	      strncpy (args[i], argv[remaining_args+i-1], len);
	    }
	  args[i] = NULL;

	  strcpy (envvar, "DBUS_SESSION_BUS_ADDRESS=");
	  strcat (envvar, bus_address);
	  putenv (envvar);

	  execvp (runprog, args);
	  fprintf (stderr, "Couldn't exec %s: %s\n", runprog, strerror (errno));
	  exit (1);
	}
      else
	{
	  print_variables (bus_address, bus_pid, wid, c_shell_syntax,
			   bourne_shell_syntax, binary_syntax);
	}
	  
      verbose ("dbus-launch exiting\n");

      fflush (stdout);
      fflush (stderr);
      close (1);
      close (2);
      
      exit (0);
    } 
  
  return 0;
 oom:
  fprintf (stderr, "Out of memory!");
  exit (1);
}