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/* $OpenBSD: logout.c,v 1.10 2019/06/28 13:32:43 deraadt Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. 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.
* 3. 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.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <fcntl.h>
#include <utmp.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
typedef struct utmp UTMP;
int
logout(const char *line)
{
int fd, rval;
UTMP ut;
if ((fd = open(_PATH_UTMP, O_RDWR|O_CLOEXEC)) == -1)
return(0);
rval = 0;
while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE))
continue;
memset(ut.ut_name, 0, UT_NAMESIZE);
memset(ut.ut_host, 0, UT_HOSTSIZE);
(void)time(&ut.ut_time);
(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
(void)write(fd, &ut, sizeof(UTMP));
rval = 1;
}
(void)close(fd);
return(rval);
}
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