require -t flag for command line timeout value

[unix-history] / usr / src / usr.bin / lock / lock.c

/*
* Copyright (c) 1980, 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)lock.c      5.7 (Berkeley) %G%";
#endif /* not lint */

/*
* Lock a terminal up until the given key is entered, until the root
* password is entered, or the given interval times out.
*
* Timeout interval is by default TIMEOUT, it can be changed with
* an argument of the form -time where time is in minutes
*/

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/signal.h>
#include <pwd.h>
#include <sgtty.h>
#include <stdio.h>
#include <ctype.h>

#define TIMEOUT 15

int     quit(), bye(), hi();

struct timeval  timeout;
struct timeval  zerotime;
struct sgttyb   tty, ntty;
long    nexttime;                       /* keep the timeout time */

/*ARGSUSED*/
main(argc, argv)
       int argc;
       char **argv;
{
       extern char *optarg;
       extern int optind;
       struct passwd *root_pwd, *my_pwd;
       struct timeval timval;
       struct itimerval ntimer, otimer;
       struct tm *timp;
       int ch, sectimeout, use_mine;
       char *ttynam, *ap, *tzn;
       char hostname[MAXHOSTNAMELEN], s[BUFSIZ], s1[BUFSIZ];
       char *crypt(), *index(), *ttyname();

       use_mine = 0;
       sectimeout = TIMEOUT;
       while ((ch = getopt(argc, argv, "pt:")) != EOF)
               switch((char)ch) {
               case 't':
                       if ((sectimeout = atoi(optarg)) <= 0)
                               exit(0);
                       break;
               case 'p':
                       use_mine = 1;
                       break;
               case '?':
               default:
                       fputs("usage: lock [-p] [-t timeout]\n", stderr);
                       exit(1);
       }
       timeout.tv_sec = sectimeout * 60;

       /* get information for header */
       if (ioctl(0, TIOCGETP, &tty))
               exit(1);
       gethostname(hostname, sizeof(hostname));
       if (!(ttynam = ttyname(0))) {
               puts("lock: not a terminal?");
               exit(1);
       }
       if (gettimeofday(&timval, (struct timezone *)NULL)) {
               perror("gettimeofday");
               exit(1);
       }
       nexttime = timval.tv_sec + (sectimeout * 60);
       timp = localtime(&timval.tv_sec);
       ap = asctime(timp);
       tzn = timp->tm_zone;

       (void)signal(SIGINT, quit);
       (void)signal(SIGQUIT, quit);
       ntty = tty; ntty.sg_flags &= ~ECHO;
       (void)ioctl(0, TIOCSETP, &ntty);

       if (!use_mine) {
               /* get key and check again */
               fputs("Key: ", stdout);
               if (!gets(s, sizeof(s)))
                       quit();
               fputs("\nAgain: ", stdout);
               /*
                * Don't need EOF test here, if we get EOF, then s1 != s
                * and the right things will happen.
                */
               (void)gets(s1, sizeof(s1));
               putchar('\n');
               if (strcmp(s1, s)) {
                       puts("\07lock: passwords didn't match.");
                       ioctl(0, TIOCSETP, &tty);
                       exit(1);
               }
               s[0] = NULL;
       }

       /* set signal handlers */
       (void)signal(SIGINT, hi);
       (void)signal(SIGQUIT, hi);
       (void)signal(SIGTSTP, hi);
       (void)signal(SIGALRM, bye);

       ntimer.it_interval = zerotime;
       ntimer.it_value = timeout;
       setitimer(ITIMER_REAL, &ntimer, &otimer);

       /* header info */
       printf ("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
               ttynam, hostname, sectimeout, ap, tzn, ap + 19);

       /* wait */
       root_pwd = getpwuid(0);
       if (use_mine)
               my_pwd = getpwuid(getuid());
       for (;;) {
               fputs("Key: ", stdout);
               if (!gets(s, sizeof(s))) {
                       clearerr(stdin);
                       hi();
                       continue;
               }
               if (use_mine) {
                       if (!my_pwd || !*my_pwd->pw_passwd || !strcmp(my_pwd->pw_passwd, crypt(s, my_pwd->pw_passwd)))
                               break;
               }
               else if (!strcmp(s1, s))
                       break;
               if (!root_pwd || !*root_pwd->pw_passwd || !strcmp(root_pwd->pw_passwd, crypt(s, root_pwd->pw_passwd)))
                       break;
               puts("\07");
               if (ioctl(0, TIOCGETP, &ntty))
                       exit(1);
       }
       putchar('\n');
       quit();
}

static
hi()
{
       struct timeval timval;

       if (!gettimeofday(&timval, (struct timezone *)NULL))
           printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n",
           (nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60);
}

static
quit()
{
       (void)ioctl(0, TIOCSETP, &tty);
       exit(0);
}

static
bye()
{
       (void)ioctl(0, TIOCSETP, &tty);
       puts("lock: timeout");
       exit(1);
}