lastlogin.c revision 205365 
1/*
2 * Copyright (c) 1996 John M. Vinopal
3 * 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 for the NetBSD Project
16 *	by John M. Vinopal.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
28 * 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#include <sys/cdefs.h>
34#ifndef lint
35__RCSID("$FreeBSD: head/usr.sbin/lastlogin/lastlogin.c 205365 2010-03-20 09:29:25Z ed $");
36__RCSID("$NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $");
37#endif
38
39#include <err.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <time.h>
43#include <unistd.h>
44#include <utmpx.h>
45
46	int	main(int, char **);
47static	void	output(struct utmpx *);
48static	void	usage(void);
49
50int
51main(int argc, char *argv[])
52{
53	int	ch, i;
54	struct utmpx *u;
55
56	while ((ch = getopt(argc, argv, "")) != -1) {
57		usage();
58	}
59
60	/* Process usernames given on the command line. */
61	if (argc > 1) {
62		for (i = 1; i < argc; ++i) {
63			if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0)
64				errx(1, "failed to open lastlog database");
65			if ((u = getutxuser(argv[i])) == NULL) {
66				warnx("user '%s' not found", argv[i]);
67				continue;
68			}
69			output(u);
70			endutxent();
71		}
72	}
73	/* Read all lastlog entries, looking for active ones */
74	else {
75		if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0)
76			errx(1, "failed to open lastlog database");
77		while ((u = getutxent()) != NULL) {
78			if (u->ut_type != USER_PROCESS)
79				continue;
80			output(u);
81		}
82		endutxent();
83	}
84
85	exit(0);
86}
87
88/* Duplicate the output of last(1) */
89static void
90output(struct utmpx *u)
91{
92	time_t t = u->ut_tv.tv_sec;
93
94	printf("%-10s %-8s %-22.22s %s",
95		u->ut_user, u->ut_line, u->ut_host, ctime(&t));
96}
97
98static void
99usage(void)
100{
101	fprintf(stderr, "usage: lastlogin [user ...]\n");
102	exit(1);
103}
104