127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/* $OpenBSD: logutmp.c,v 1.14 2019/06/28 13:32:53 deraadt Exp $ */
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/*
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* Portions Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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* Portions Copyright (c) 1996, Jason Downs. 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 <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <utmp.h>
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#include <stdio.h>
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#include <string.h>
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#include <ttyent.h>
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#include "monitor.h"
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#include "extern.h"
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static int fd = -1;
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static int topslot = -1;
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/*
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* Special versions of login()/logout() which hold the utmp file open,
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* for use with ftpd.
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*/
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void
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ftpd_login(struct utmp *ut)
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{
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struct utmp ubuf;
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/*
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* First, loop through /etc/ttys, if needed, to initialize the
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* top of the tty slots, since ftpd has no tty.
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*/
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if (topslot < 0) {
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topslot = 0;
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while (getttyent() != (struct ttyent *)NULL)
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topslot++;
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}
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if ((topslot < 0) || ((fd < 0) &&
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(fd = open(_PATH_UTMP, O_RDWR|O_CREAT, 0644)) == -1))
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return;
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/*
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* Now find a slot that's not in use...
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*/
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(void)lseek(fd, (off_t)topslot * sizeof(struct utmp), SEEK_SET);
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while (1) {
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if (read(fd, &ubuf, sizeof(struct utmp)) ==
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sizeof(struct utmp)) {
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if (!ubuf.ut_name[0]) {
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(void)lseek(fd, -(off_t)sizeof(struct utmp),
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SEEK_CUR);
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break;
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}
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topslot++;
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} else {
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(void)lseek(fd, (off_t)topslot * sizeof(struct utmp),
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SEEK_SET);
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break;
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}
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}
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(void)write(fd, ut, sizeof(struct utmp));
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}
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int
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ftpd_logout(char *line)
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{
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struct timeval tv;
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struct utmp ut;
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int rval;
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rval = 0;
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if (fd < 0)
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return(rval);
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(void)lseek(fd, 0, SEEK_SET);
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while (read(fd, &ut, sizeof(struct utmp)) == sizeof(struct utmp)) {
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if (!ut.ut_name[0] ||
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strncmp(ut.ut_line, line, UT_LINESIZE))
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continue;
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bzero(ut.ut_name, UT_NAMESIZE);
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bzero(ut.ut_host, UT_HOSTSIZE);
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gettimeofday(&tv, NULL);
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ut.ut_time = tv.tv_sec;
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(void)lseek(fd, -(off_t)sizeof(struct utmp), SEEK_CUR);
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(void)write(fd, &ut, sizeof(struct utmp));
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rval = 1;
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}
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return(rval);
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}
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