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Closes PR bin/1567

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/usr/bin/lock can be used to lock a terminal much like xlock does
for your X-windows session.  Problem is, /usr/bin/lock cannot lock
your terminal indefinately.  Rather you must specify a timeout
value, after which, your terminal is unlocked and become unsecured.

I have added a ``-n'' no timeout option to /usr/bin/lock
Currently the only way to get this functionality is to use a huge
timeout value and hope it is long enought (in time).  This method
also requires you to know the maxium number of minutes you are
allowed to specify.

Submitted by:	David E. O'Brien <obrien@Nuxi.cs.ucdavis.edu>
This commit is contained in:
Ollivier Robert 1996-09-14 09:00:52 +00:00
parent 2e82980a4c
commit 2280509ca1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18295
2 changed files with 32 additions and 9 deletions
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3
usr.bin/lock/lock.1
View File

@ -39,6 +39,7 @@
.Nd reserve a terminal
.Sh SYNOPSIS
.Nm lock
.Op Fl n
.Op Fl p
.Op Fl t Ar timeout
.Sh DESCRIPTION
@ -53,6 +54,8 @@ with the appropriate permission.
Options:
.Pp
.Bl -tag -width Fl
.It Fl n
Don't use a timeout value. Terminal will be locked forever.
.It Fl p
A password is not requested, instead the user's current login password
is used.

38
usr.bin/lock/lock.c
View File

@ -70,6 +70,7 @@ 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)
@ -90,7 +91,8 @@ main(argc, argv)
sectimeout = TIMEOUT;
mypw = NULL;
usemine = 0;
while ((ch = getopt(argc, argv, "pt:")) != EOF)
no_timeout = 0;
while ((ch = getopt(argc, argv, "npt:")) != EOF)
switch((char)ch) {
case 't':
if ((sectimeout = atoi(optarg)) <= 0) {
@ -108,10 +110,13 @@ main(argc, argv)
}
mypw = strdup(pw->pw_passwd);
break;
case 'n':
no_timeout = 1;
break;
case '?':
default:
(void)fprintf(stderr,
"usage: lock [-p] [-t timeout]\n");
"usage: lock [-n] [-p] [-t timeout]\n");
exit(1);
}
timeout.tv_sec = sectimeout * 60;
@ -169,11 +174,17 @@ main(argc, argv)
ntimer.it_interval = zerotime;
ntimer.it_value = timeout;
setitimer(ITIMER_REAL, &ntimer, &otimer);
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: ");
@ -201,9 +212,16 @@ hi()
{
struct timeval timval;
if (!gettimeofday(&timval, (struct timezone *)NULL))
(void)printf("lock: type in the unlock key. timeout in %ld:%ld minutes\n",
(nexttime - timval.tv_sec) / 60, (nexttime - timval.tv_sec) % 60);
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
@ -217,7 +235,9 @@ quit()
void
bye()
{
(void)ioctl(0, TIOCSETP, &tty);
(void)printf("lock: timeout\n");
exit(1);
if (!no_timeout) {
(void)ioctl(0, TIOCSETP, &tty);
(void)printf("lock: timeout\n");
exit(1);
}
}