logwtmp.c revision 1.2 
1/*	$NetBSD: logwtmp.c,v 1.4 1995/04/11 02:44:58 cgd Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 */
36
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
40#else
41static char rcsid[] = "$NetBSD: logwtmp.c,v 1.4 1995/04/11 02:44:58 cgd Exp $";
42#endif
43#endif /* not lint */
44
45#include <sys/types.h>
46#include <sys/time.h>
47#include <sys/stat.h>
48
49#include <fcntl.h>
50#include <utmp.h>
51#include <unistd.h>
52#include <stdio.h>
53#include <string.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(line, name, host)
65	char *line, *name, *host;
66{
67	struct utmp ut;
68	struct stat buf;
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		(void)time(&ut.ut_time);
77		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
78		    sizeof(struct utmp))
79			(void)ftruncate(fd, buf.st_size);
80	}
81}
82