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/* $OpenBSD: logutmp.c,v 1.6 2003/06/11 14:24:46 deraadt Exp $ */
/*
* Portions Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
* Portions Copyright (c) 1996, Jason Downs. 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 <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <utmp.h>
#include <stdio.h>
#include <string.h>
#include <ttyent.h>
typedef struct utmp UTMP;
static int fd = -1;
static int topslot = -1;
/*
* Special versions of login()/logout() which hold the utmp file open,
* for use with ftpd.
*/
void
login(UTMP *ut)
{
UTMP ubuf;
/*
* First, loop through /etc/ttys, if needed, to initialize the
* top of the tty slots, since ftpd has no tty.
*/
if (topslot < 0) {
topslot = 0;
while (getttyent() != (struct ttyent *)NULL)
topslot++;
}
if ((topslot < 0) || ((fd < 0) &&
(fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) < 0))
return;
/*
* Now find a slot that's not in use...
*/
(void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);
while (1) {
if (read(fd, &ubuf, sizeof(UTMP)) == sizeof(UTMP)) {
if (!ubuf.ut_name[0]) {
(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
break;
}
topslot++;
} else {
(void)lseek(fd, (off_t)(topslot * sizeof(UTMP)), SEEK_SET);
break;
}
}
(void)write(fd, ut, sizeof(UTMP));
}
int
logout(char *line)
{
UTMP ut;
int rval;
rval = 0;
if (fd < 0)
return(rval);
(void)lseek(fd, 0, SEEK_SET);
while (read(fd, &ut, sizeof(UTMP)) == sizeof(UTMP)) {
if (!ut.ut_name[0] ||
strncmp(ut.ut_line, line, UT_LINESIZE))
continue;
bzero(ut.ut_name, UT_NAMESIZE);
bzero(ut.ut_host, UT_HOSTSIZE);
(void)time(&ut.ut_time);
(void)lseek(fd, -(off_t)sizeof(UTMP), SEEK_CUR);
(void)write(fd, &ut, sizeof(UTMP));
rval = 1;
}
return(rval);
}
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