logwtmp.c revision 1.9 
1/*	$OpenBSD: logwtmp.c,v 1.9 2004/11/28 20:24:51 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#ifndef lint
35#if 0
36static const char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
37#else
38static const char rcsid[] =
39    "$OpenBSD: logwtmp.c,v 1.9 2004/11/28 20:24:51 deraadt Exp $";
40#endif
41#endif /* not lint */
42
43#include <sys/types.h>
44#include <sys/time.h>
45#include <sys/stat.h>
46
47#include <fcntl.h>
48#include <utmp.h>
49#include <unistd.h>
50#include <stdio.h>
51#include <string.h>
52
53#include <netinet/in.h>
54#include "extern.h"
55
56static int fd = -1;
57
58/*
59 * Modified version of logwtmp that holds wtmp file open
60 * after first call, for use with ftp (which may chroot
61 * after login, but before logout).
62 */
63void
64ftpdlogwtmp(char *line, char *name, char *host)
65{
66	struct timeval tv;
67	struct stat buf;
68	struct utmp ut;
69
70	if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
71		return;
72	if (fstat(fd, &buf) == 0) {
73		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
74		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
75		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
76		gettimeofday(&tv, NULL);
77		ut.ut_time = tv.tv_sec;
78		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
79		    sizeof(struct utmp))
80			(void)ftruncate(fd, buf.st_size);
81	}
82}
83