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Add revoke(1).

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While hacking on TTY code, I often miss a small utility to revoke my own
(pseudo-)terminals. This small utility is just a small wrapper around
the revoke(2) call, so you can destroy your very own login sessions.

Approved by:	re
This commit is contained in:
ed 2009-06-15 21:52:27 +00:00
parent 8e18b541e7
commit 675236a73e
5 changed files with 125 additions and 1 deletions
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3
lib/libc/sys/revoke.2
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@ -97,7 +97,8 @@ operation on the named file.
The caller is neither the owner of the file nor the super user.
.El
.Sh SEE ALSO
.Xr close 2
.Xr close 2 ,
.Xr revoke 1
.Sh HISTORY
The
.Fn revoke

1
usr.bin/Makefile
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@ -157,6 +157,7 @@ SUBDIR= alias \
${_quota} \
renice \
rev \
revoke \
${_rlogin} \
${_rpcgen} \
rpcinfo \

7
usr.bin/revoke/Makefile Normal file
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@ -0,0 +1,7 @@
# $FreeBSD$
PROG= revoke
WARNS?= 6
.include <bsd.prog.mk>

56
usr.bin/revoke/revoke.1 Normal file
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@ -0,0 +1,56 @@
.\" Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
.\" All rights reserved.
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd June 15, 2009
.Dt REVOKE 1
.Os
.Sh NAME
.Nm revoke
.Nd "revoke a character device"
.Sh SYNOPSIS
.Nm
.Ar
.Sh DESCRIPTION
The
.Nm
program revokes the character devices using
.Xr revoke 2 .
When used on a TTY, calls like
.Xr read 2 ,
.Xr write 2
and
.Xr ioctl 2 ,
will be aborted immediately, effectively causing login sessions to be
terminated.
.Sh SEE ALSO
.Xr revoke 2
.Sh HISTORY
The
.Nm
program first appeared in
.Fx 8.0 .
.Sh AUTHORS
.An Ed Schouten Aq ed@FreeBSD.org

59
usr.bin/revoke/revoke.c Normal file
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@ -0,0 +1,59 @@
/*-
* Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void
usage(void)
{
fprintf(stderr, "usage: revoke file ...\n");
exit(1);
}
int
main(int argc, char *argv[])
{
char **d;
int error = 0;
if (argc == 1)
usage();
for (d = &argv[1]; *d != NULL; d++) {
if (revoke(*d) != 0) {
perror(*d);
error = 1;
}
}
return (error);
}