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("$FreeBSD$");
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 <string.h>
43#include <time.h>
44#include <unistd.h>
45#include <utmpx.h>
46
47	int	main(int, char **);
48static	void	output(struct utmpx *);
49static	void	usage(void);
50static int	utcmp_user(const void *, const void *);
51
52static int	order = 1;
53static const char *file = NULL;
54static int	(*utcmp)(const void *, const void *) = utcmp_user;
55
56static int
57utcmp_user(const void *u1, const void *u2)
58{
59
60	return (order * strcmp(((const struct utmpx *)u1)->ut_user,
61	    ((const struct utmpx *)u2)->ut_user));
62}
63
64static int
65utcmp_time(const void *u1, const void *u2)
66{
67	time_t t1, t2;
68
69	t1 = ((const struct utmpx *)u1)->ut_tv.tv_sec;
70	t2 = ((const struct utmpx *)u2)->ut_tv.tv_sec;
71	return (t1 < t2 ? order : t1 > t2 ? -order : 0);
72}
73
74int
75main(int argc, char *argv[])
76{
77	int	ch, i, ulistsize;
78	struct utmpx *u, *ulist;
79
80	while ((ch = getopt(argc, argv, "f:rt")) != -1) {
81		switch (ch) {
82		case 'f':
83			file = optarg;
84			break;
85		case 'r':
86			order = -1;
87			break;
88		case 't':
89			utcmp = utcmp_time;
90			break;
91		default:
92			usage();
93		}
94	}
95	argc -= optind;
96	argv += optind;
97
98	if (argc > 0) {
99		/* Process usernames given on the command line. */
100		for (i = 0; i < argc; i++) {
101			if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
102				err(1, "failed to open lastlog database");
103			if ((u = getutxuser(argv[i])) == NULL) {
104				warnx("user '%s' not found", argv[i]);
105				continue;
106			}
107			output(u);
108			endutxent();
109		}
110	} else {
111		/* Read all lastlog entries, looking for active ones. */
112		if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
113			err(1, "failed to open lastlog database");
114		ulist = NULL;
115		ulistsize = 0;
116		while ((u = getutxent()) != NULL) {
117			if (u->ut_type != USER_PROCESS)
118				continue;
119			if ((ulistsize % 16) == 0) {
120				ulist = realloc(ulist,
121				    (ulistsize + 16) * sizeof(struct utmpx));
122				if (ulist == NULL)
123					err(1, "malloc");
124			}
125			ulist[ulistsize++] = *u;
126		}
127		endutxent();
128
129		qsort(ulist, ulistsize, sizeof(struct utmpx), utcmp);
130		for (i = 0; i < ulistsize; i++)
131			output(&ulist[i]);
132	}
133
134	exit(0);
135}
136
137/* Duplicate the output of last(1) */
138static void
139output(struct utmpx *u)
140{
141	time_t t = u->ut_tv.tv_sec;
142
143	printf("%-10s %-8s %-22.22s %s",
144		u->ut_user, u->ut_line, u->ut_host, ctime(&t));
145}
146
147static void
148usage(void)
149{
150	fprintf(stderr, "usage: lastlogin [-f file] [-rt] [user ...]\n");
151	exit(1);
152}
153