main.c

/*
   This is a program to display menus on a text tty, good for limited access
   guest accounts, or just for user menus.

   Copyright (C) 1996 Stephen Fegan

   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; see the file COPYING. If not write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

   please send patches or advice to: `flash@netsoc.ucd.ie' 
 */

/* Include configuration data */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>
#include <pwd.h>
#include <syslog.h>
#include <signal.h>
#include <time.h>

#include "parse.h"
#include "string.h"
#include "screen.h"
#include "config.h"
#include "event.h"
#include "exec.h"
#include "set.h"
#include "rc.h"
#include "debug.h"
#include "misc.h"

extern char delim;
extern char escape;
extern char comment;

void handle_children (void);
void die_by_signal(int s);

char *progname;
char *menufile;
int login_shell=0;
time_t start_time;

struct menu_items **GlobalHotKeys=NULL;

struct menu *main_menu;

/* need to fix: -v\t\t\tDisplay run-time variables, menus, environment\n\ */
static void 
usage ()
{
  fprintf (stderr,
	   "Usage: %s [-hV] [-b <directory>] [-c <command>] [menu file]\n\n\
   -b <directory>\tSet base directory to <directory>\n\
   -c <command>\t\tA normal shell would run <command>, we dump it to syslog\n\
   -d <filename>\tSet debug file to <filename>\n\
   -h\t\t\tDisplay help and exit\n\
   -l\t\t\tLog all execs to syslog\n\
   -V\t\t\tDisplay version and compile-time options then exit\n\
   [menu file]\t\tMenu file to load from\n\n\
With no options [menu file] is set to `%s'\n",
	   progname, DEFAULT_MENU);
}

static void 
version ()
{
  fprintf (stderr,
	   "flash version %s, Copyright (C) 1996 Stephen Fegan <flash@netsoc.ucd.ie>\n\
flash comes with ABSOLUTELY NO WARRANTY. This is free software,\n\
you are welcome to redistribute it and modify it under the\n\
conditions of the GNU General Public License.\n\n\
Compile-time options:\n\
Default menu: `%s', Base directory: `%s%s'\n", 
	   VERSION,DEFAULT_MENU,PREFIX,LIBPREFIX);
}

int 
main (int argc, char *argv[])
{
  struct passwd *ppwd, pwd;
  struct sigaction s_act;
  char c;
  char *filename = DEFAULT_MENU;
  int ShowVariables=0;
  pid_t shell_pgid;
  sigset_t smask;

  int debug_file = 0;


  progname = argv[0];
  login_shell=(*progname == '-');
  time(&start_time);

  ppwd = getpwuid (getuid ());
  memcpy (&pwd, ppwd, sizeof (struct passwd));
  endpwent();

#if 0
  while(tcgetpgrp(0) != (shell_pgid = getpgrp()))
    kill(-shell_pgid, SIGTTIN);
#endif

  /* Signal Stuff */

  signal (SIGINT, SIG_IGN);
  signal (SIGTSTP, SIG_IGN);
  signal (SIGQUIT, SIG_IGN);

  signal (SIGTTIN, SIG_IGN);
  signal (SIGTTOU, SIG_IGN);

  s_act.sa_handler = (void (*)(int))handle_children;
  sigemptyset (&s_act.sa_mask);
  s_act.sa_flags = 0;
  sigaction (SIGCHLD, &s_act, (struct sigaction *) NULL);

  setpgid(0,0);
  shell_pgid=getpgrp();

  s_act.sa_handler = (void (*)(int))handle_snarfed_tty;
  sigemptyset (&s_act.sa_mask);
  s_act.sa_flags = 0;
  if((sigaction (SIGTTIN, &s_act, (struct sigaction *) NULL)==-1)||
     (sigaction (SIGTTOU, &s_act, (struct sigaction *) NULL)==-1))
    {
      perror("Could not set signal handler");
      exit(EXIT_FAILURE);
    }

  sigemptyset(&smask);
  sigprocmask (SIG_SETMASK, &smask, NULL);


  /* Read command line options */

  /* Use our own messages */
  opterr = 0;
  
  while ((c = getopt (argc, argv, "lhVvb:d:c:")) != -1)
    switch (c)
      {
      case 'b':
	if ((optarg==NULL)||(strlen(optarg)==0))
	  {
	    usage ();
	    exit (1);
	  }
	setbasedirectory(optarg);
	break;
      case 'c':
	if ((optarg==NULL)||(strlen(optarg)==0))
	  {
	    usage ();
	    exit (1);
	  }
	syslog (LOG_LOCAL1 | LOG_WARNING, "%d: flash: USE OF OPTION -c: %s",
		getpid (), optarg);
	break;
      case 'd':
	if((optarg==NULL)||(strlen(optarg)==0))
	  {
	    usage();
	    exit(1);
	  }
	set_debug_file(optarg);
        debug_file = 1;
	break;
      case 'h':
	usage ();
	exit (0);
      case 'l':
	set_variable("logging",NULL,0);
	break;
      case 'V':
	version ();
	exit (0);
      case 'v':
	ShowVariables=1;
	break;
      case '?':
	if (isprint (optopt))
	  fprintf (stderr, "Unknown option: `-%c'.\n", optopt);
	else
	  fprintf (stderr, "Unknown option character: `\\x%x'.\n", optopt);
	    usage ();
	exit (1);
      default:
	abort ();
      }

  if (optind < argc)
    filename = argv[optind];
  
  global_variables();

  init_schedule();
  init_jobq();
  signal (SIGHUP,  die_by_signal);
  signal (SIGTERM, die_by_signal);

  init_scr ();
  pause_scr();

  if (parsefile (filename) == -1)
    {
      fprintf (stderr, "%s: error while parsing\n", progname);
      exit (EXIT_FAILURE);
    }

  balance_menu_tree();
  main_menu = find_mainmenu();
  if(main_menu==NULL)
    {
      fprintf (stderr, "%s: No Menus !!\n", progname);
      freemem (menufile);
      exit (1);
    }      

  openlog (pwd.pw_name, 0, LOG_USER);

  /* Setup global HotKeys */

  setupglobalhotkeys();

  /*
     Looking over peoples' shoulders
   */

  if (find_variable("logging",NULL) == 1)
    syslog (LOG_LOCAL1 | LOG_INFO, "%d: flash started %s",
	    getpid (), filename);

  if(ShowVariables)showconfig(filename);
	

  init_scr ();
  do_menu (main_menu);
  close_scr ();

  signal (SIGHUP,  SIG_IGN);
  signal (SIGTERM, SIG_IGN);
  finish_jobq();
  finish_schedule();

  if (find_variable("logging",NULL) == 1)
    syslog (LOG_LOCAL1 | LOG_INFO, "%d: flash finished",
	    getpid ());

  if (debug_file == 1) { close_debug_file(); }

  /* we outtie */
  exit (0);
}