Merge commit 'crater/master'
[dragonfly.git] / usr.sbin / lastlogin / lastlogin.c
CommitLineData
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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.
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31 *
32 * $NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $
33 * $FreeBSD: src/usr.sbin/lastlogin/lastlogin.c,v 1.2.2.2 2001/07/19 05:02:46 kris Exp $
7e13458c 34 * $DragonFly: src/usr.sbin/lastlogin/lastlogin.c,v 1.5 2004/11/13 16:14:33 liamfoy Exp $
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35 */
36
37#include <sys/cdefs.h>
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38
39#include <err.h>
40#include <pwd.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <time.h>
44#include <utmp.h>
45#include <unistd.h>
46
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47static void output(struct passwd *, struct lastlog *);
48static void usage(void);
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49
50int
68da13b1 51main(int argc, char **argv)
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52{
53 int ch, i;
54 FILE *fp;
55 struct passwd *passwd;
56 struct lastlog last;
57
58 while ((ch = getopt(argc, argv, "")) != -1) {
59 usage();
60 }
61
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62 if ((fp = fopen(_PATH_LASTLOG, "r")) == NULL)
63 err(1, "%s", _PATH_LASTLOG);
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64
65 setpassent(1); /* Keep passwd file pointers open */
66
67 /* Process usernames given on the command line. */
68 if (argc > 1) {
69 long offset;
70 for (i = 1; i < argc; ++i) {
71 if ((passwd = getpwnam(argv[i])) == NULL) {
72 warnx("user '%s' not found", argv[i]);
73 continue;
74 }
75 /* Calculate the offset into the lastlog file. */
76 offset = (long)(passwd->pw_uid * sizeof(last));
77 if (fseek(fp, offset, SEEK_SET)) {
78 warn("fseek error");
79 continue;
80 }
81 if (fread(&last, sizeof(last), 1, fp) != 1) {
82 warnx("fread error on '%s'", passwd->pw_name);
83 clearerr(fp);
84 continue;
85 }
86 output(passwd, &last);
87 }
88 }
89 /* Read all lastlog entries, looking for active ones */
90 else {
91 for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) {
92 if (last.ll_time == 0)
93 continue;
94 if ((passwd = getpwuid((uid_t)i)) != NULL)
95 output(passwd, &last);
96 }
97 if (ferror(fp))
98 warnx("fread error");
99 }
100
101 setpassent(0); /* Close passwd file pointers */
102
103 fclose(fp);
104 exit(0);
105}
106
107/* Duplicate the output of last(1) */
108static void
68da13b1 109output(struct passwd *p, struct lastlog *l)
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110{
111 printf("%-*.*s %-*.*s %-*.*s %s",
112 UT_NAMESIZE, UT_NAMESIZE, p->pw_name,
113 UT_LINESIZE, UT_LINESIZE, l->ll_line,
114 UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host,
115 (l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n");
116}
117
118static void
68da13b1 119usage(void)
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120{
121 fprintf(stderr, "usage: lastlogin [user ...]\n");
122 exit(1);
123}