/* * 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. */ #if defined(DOSCCS) && !defined(lint) char copyright[] = "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ All rights reserved.\n"; static char sccsid[] = "@(#)lock.c 5.10.1 (2.11BSD GTE) 12/31/93"; #endif /* * 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 <sgtty.h> #include <pwd.h> #include <stdio.h> #include <ctype.h> #include <strings.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 errno, optind; struct passwd *pw; struct timeval timval; struct itimerval ntimer, otimer; struct tm *timp; int ch, sectimeout, usemine; char *ap, *mypw, *ttynam, *tzn; char hostname[MAXHOSTNAMELEN], s[256], s1[256]; char *crypt(), *ttyname(); sectimeout = TIMEOUT; mypw = NULL; usemine = 0; while ((ch = getopt(argc, argv, "pt:")) != EOF) switch((char)ch) { case 't': if ((sectimeout = atoi(optarg)) <= 0) exit(1); break; case 'p': usemine = 1; if (!(pw = getpwuid(getuid()))) { fprintf(stderr, "lock: unknown uid %d.\n", getuid()); exit(1); } mypw = strdup(pw->pw_passwd); break; case '?': default: fprintf(stderr, "usage: lock [-p] [-t timeout]\n"); exit(1); } timeout.tv_sec = sectimeout * 60; setuid(getuid()); /* discard privs */ if (ioctl(0, TIOCGETP, &tty)) /* get information for header */ exit(1); gethostname(hostname, sizeof(hostname)); if (!(ttynam = ttyname(0))) { printf("lock: not a terminal?\n"); exit(1); } if (gettimeofday(&timval, (struct timezone *)NULL)) { fprintf(stderr, "lock: gettimeofday: %s\n", strerror(errno)); 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 (!mypw) { /* get key and check again */ printf("Key: "); if (!fgets(s, sizeof(s), stdin) || *s == '\n') quit(); printf("\nAgain: "); /* * Don't need EOF test here, if we get EOF, then s1 != s * and the right things will happen. */ (void)fgets(s1, sizeof(s1), stdin); putchar('\n'); if (strcmp(s1, s)) { printf("\07lock: passwords didn't match.\n"); ioctl(0, TIOCSETP, &tty); exit(1); } s[0] = NULL; mypw = s1; } /* 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); for (;;) { printf("Key: "); if (!fgets(s, sizeof(s), stdin)) { clearerr(stdin); hi(); continue; } if (usemine) { s[strlen(s) - 1] = '\0'; if (!strcmp(mypw, crypt(s, mypw))) break; } else if (!strcmp(s, s1)) break; printf("\07\n"); if (ioctl(0, TIOCGETP, &ntty)) exit(1); } 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() { putchar('\n'); (void)ioctl(0, TIOCSETP, &tty); exit(0); } static bye() { (void)ioctl(0, TIOCSETP, &tty); printf("lock: timeout\n"); exit(1); }