lastlogin.c revision 206472 
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 206472 2010-04-11 12:07:03Z 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 <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);
50
51static int
52utcmp(const void *u1, const void *u2)
53{
54
55	return (strcmp(((const struct utmpx *)u1)->ut_user,
56	    ((const struct utmpx *)u2)->ut_user));
57}
58
59int
60main(int argc, char *argv[])
61{
62	int	ch, i, ulistsize;
63	struct utmpx *u, *ulist;
64
65	while ((ch = getopt(argc, argv, "")) != -1) {
66		usage();
67	}
68
69	/* Process usernames given on the command line. */
70	if (argc > 1) {
71		for (i = 1; i < argc; ++i) {
72			if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0)
73				errx(1, "failed to open lastlog database");
74			if ((u = getutxuser(argv[i])) == NULL) {
75				warnx("user '%s' not found", argv[i]);
76				continue;
77			}
78			output(u);
79			endutxent();
80		}
81	}
82	/* Read all lastlog entries, looking for active ones */
83	else {
84		if (setutxdb(UTXDB_LASTLOGIN, NULL) != 0)
85			errx(1, "failed to open lastlog database");
86		ulist = NULL;
87		ulistsize = 0;
88		while ((u = getutxent()) != NULL) {
89			if (u->ut_type != USER_PROCESS)
90				continue;
91			if ((ulistsize % 16) == 0) {
92				ulist = realloc(ulist,
93				    (ulistsize + 16) * sizeof(struct utmpx));
94				if (ulist == NULL)
95					err(1, "malloc");
96			}
97			ulist[ulistsize++] = *u;
98		}
99		endutxent();
100
101		qsort(ulist, ulistsize, sizeof(struct utmpx), utcmp);
102		for (i = 0; i < ulistsize; i++)
103			output(&ulist[i]);
104	}
105
106	exit(0);
107}
108
109/* Duplicate the output of last(1) */
110static void
111output(struct utmpx *u)
112{
113	time_t t = u->ut_tv.tv_sec;
114
115	printf("%-10s %-8s %-22.22s %s",
116		u->ut_user, u->ut_line, u->ut_host, ctime(&t));
117}
118
119static void
120usage(void)
121{
122	fprintf(stderr, "usage: lastlogin [user ...]\n");
123	exit(1);
124}
125