logwtmp.c revision 1593 
1/*
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 */
34
35#ifndef lint
36static char sccsid[] = "@(#)logwtmp.c	8.1 (Berkeley) 6/4/93";
37#endif /* not lint */
38
39#include <sys/types.h>
40#include <sys/time.h>
41#include <sys/stat.h>
42
43#include <fcntl.h>
44#include <utmp.h>
45#include <unistd.h>
46#include <stdio.h>
47#include <string.h>
48#include "extern.h"
49
50static int fd = -1;
51
52/*
53 * Modified version of logwtmp that holds wtmp file open
54 * after first call, for use with ftp (which may chroot
55 * after login, but before logout).
56 */
57void
58logwtmp(line, name, host)
59	char *line, *name, *host;
60{
61	struct utmp ut;
62	struct stat buf;
63
64	if (fd < 0 && (fd = open(_PATH_WTMP, O_WRONLY|O_APPEND, 0)) < 0)
65		return;
66	if (fstat(fd, &buf) == 0) {
67		(void)strncpy(ut.ut_line, line, sizeof(ut.ut_line));
68		(void)strncpy(ut.ut_name, name, sizeof(ut.ut_name));
69		(void)strncpy(ut.ut_host, host, sizeof(ut.ut_host));
70		(void)time(&ut.ut_time);
71		if (write(fd, (char *)&ut, sizeof(struct utmp)) !=
72		    sizeof(struct utmp))
73			(void)ftruncate(fd, buf.st_size);
74	}
75}
76