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/*
* Copyright (c) 1980, 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Bob Toxen.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)lock.c 8.1 (Berkeley) 6/6/93";
#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 <sgtty.h>
#include <pwd.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#define TIMEOUT 15
void quit(), bye(), hi();
struct timeval timeout;
struct timeval zerotime;
struct sgttyb tty, ntty;
long nexttime; /* keep the timeout time */
int no_timeout; /* lock terminal forever */
/*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[BUFSIZ], s1[BUFSIZ];
char *crypt(), *ttyname();
sectimeout = TIMEOUT;
mypw = NULL;
usemine = 0;
no_timeout = 0;
while ((ch = getopt(argc, argv, "npt:")) != EOF)
switch((char)ch) {
case 't':
if ((sectimeout = atoi(optarg)) <= 0) {
(void)fprintf(stderr,
"lock: illegal timeout value.\n");
exit(1);
}
break;
case 'p':
usemine = 1;
if (!(pw = getpwuid(getuid()))) {
(void)fprintf(stderr,
"lock: unknown uid %d.\n", getuid());
exit(1);
}
mypw = strdup(pw->pw_passwd);
break;
case 'n':
no_timeout = 1;
break;
case '?':
default:
(void)fprintf(stderr,
"usage: lock [-n] [-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))) {
(void)printf("lock: not a terminal?\n");
exit(1);
}
if (gettimeofday(&timval, (struct timezone *)NULL)) {
(void)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 */
(void)printf("Key: ");
if (!fgets(s, sizeof(s), stdin) || *s == '\n')
quit();
(void)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);
(void)putchar('\n');
if (strcmp(s1, s)) {
(void)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;
if (!no_timeout)
setitimer(ITIMER_REAL, &ntimer, &otimer);
/* header info */
if (no_timeout) {
(void)printf("lock: %s on %s. no timeout\ntime now is %.20s%s%s",
ttynam, hostname, ap, tzn, ap + 19);
} else {
(void)printf("lock: %s on %s. timeout in %d minutes\ntime now is %.20s%s%s",
ttynam, hostname, sectimeout, ap, tzn, ap + 19);
}
for (;;) {
(void)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;
(void)printf("\07\n");
if (ioctl(0, TIOCGETP, &ntty))
exit(1);
}
quit();
}
void
hi()
{
struct timeval timval;
if (!gettimeofday(&timval, (struct timezone *)NULL)) {
(void)printf("lock: type in the unlock key. ");
if (no_timeout) {
(void)putchar('\n');
} else {
(void)printf("timeout in %ld:%ld minutes\n",
(nexttime - timval.tv_sec) / 60,
(nexttime - timval.tv_sec) % 60);
}
}
}
void
quit()
{
(void)putchar('\n');
(void)ioctl(0, TIOCSETP, &tty);
exit(0);
}
void
bye()
{
if (!no_timeout) {
(void)ioctl(0, TIOCSETP, &tty);
(void)printf("lock: timeout\n");
exit(1);
}
}
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