1/*	$OpenBSD: logwtmp.c,v 1.14 2021/10/24 21:24:20 deraadt Exp $	*/
2/*	$NetBSD: logwtmp.c,v 1.4 1995/04/11 02:44:58 cgd Exp $	*/
3
4/*
5 * Copyright (c) 1988, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 */
33
34#include <sys/types.h>
35#include <sys/time.h>
36#include <sys/stat.h>
37
38#include <fcntl.h>
39#include <utmp.h>
40#include <unistd.h>
41#include <stdio.h>
42#include <string.h>
43
44#include <netinet/in.h>
45
46#include "monitor.h"
47#include "extern.h"
48
49static int fd = -1;
50
51/*
52 * Modified version of logwtmp that holds wtmp file open
53 * after first call, for use with ftp (which may chroot
54 * after login, but before logout).
55 */
56void
57ftpdlogwtmp(const char *line, const char *name, const char *host)
58{
59	struct timeval tv;
60	struct stat buf;
61	struct utmp ut;
62
63	if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND)) == -1)
64		return;
65	if (fstat(fd, &buf) == 0) {
66		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
67		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
68		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
69		gettimeofday(&tv, NULL);
70		ut.ut_time = tv.tv_sec;
71		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
72		    sizeof(struct utmp))
73			(void)ftruncate(fd, buf.st_size);
74	}
75}
76