logwtmp.c revision 1.5 
1/*	$OpenBSD: logwtmp.c,v 1.5 2002/07/02 18:09:54 danh 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. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37
38#ifndef lint
39#if 0
40static const char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
41#else
42static const char rcsid[] =
43    "$OpenBSD: logwtmp.c,v 1.5 2002/07/02 18:09:54 danh Exp $";
44#endif
45#endif /* not lint */
46
47#include <sys/types.h>
48#include <sys/time.h>
49#include <sys/stat.h>
50
51#include <fcntl.h>
52#include <utmp.h>
53#include <unistd.h>
54#include <stdio.h>
55#include <string.h>
56
57#include <netinet/in.h>
58#include "extern.h"
59
60static int fd = -1;
61
62/*
63 * Modified version of logwtmp that holds wtmp file open
64 * after first call, for use with ftp (which may chroot
65 * after login, but before logout).
66 */
67void
68ftpdlogwtmp(line, name, host)
69	char *line, *name, *host;
70{
71	struct utmp ut;
72	struct stat buf;
73
74	if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
75		return;
76	if (fstat(fd, &buf) == 0) {
77		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
78		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
79		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
80		(void)time(&ut.ut_time);
81		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
82		    sizeof(struct utmp))
83			(void)ftruncate(fd, buf.st_size);
84	}
85}
86