66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/* $OpenBSD: logout.c,v 1.10 2019/06/28 13:32:43 deraadt Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <utmp.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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typedef struct utmp UTMP;
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int
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logout(const char *line)
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{
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int fd, rval;
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UTMP ut;
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if ((fd = open(_PATH_UTMP, O_RDWR|O_CLOEXEC)) == -1)
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return(0);
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rval = 0;
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while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
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if (!ut.ut_name[0] || strncmp(ut.ut_line, line, UT_LINESIZE))
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continue;
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memset(ut.ut_name, 0, UT_NAMESIZE);
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memset(ut.ut_host, 0, UT_HOSTSIZE);
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(void)time(&ut.ut_time);
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(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
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(void)write(fd, &ut, sizeof(UTMP));
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rval = 1;
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}
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(void)close(fd);
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return(rval);
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}
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