1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1996 John M. Vinopal
5 * Copyright (c) 2018 Philip Paeps
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed for the NetBSD Project
19 * by John M. Vinopal.
20 * 4. The name of the author may not be used to endorse or promote products
21 * derived from this software without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 __RCSID("$NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $");
39 #endif
40
41 #include <err.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <time.h>
46 #include <unistd.h>
47 #include <utmpx.h>
48
49 #include <libxo/xo.h>
50
51 int main(int, char **);
52 static void output(struct utmpx *);
53 static void usage(void);
54 static int utcmp_user(const void *, const void *);
55
56 static int order = 1;
57 static const char *file = NULL;
58 static int (*utcmp)(const void *, const void *) = utcmp_user;
59
60 static int
utcmp_user(const void * u1,const void * u2)61 utcmp_user(const void *u1, const void *u2)
62 {
63
64 return (order * strcmp(((const struct utmpx *)u1)->ut_user,
65 ((const struct utmpx *)u2)->ut_user));
66 }
67
68 static int
utcmp_time(const void * u1,const void * u2)69 utcmp_time(const void *u1, const void *u2)
70 {
71 time_t t1, t2;
72
73 t1 = ((const struct utmpx *)u1)->ut_tv.tv_sec;
74 t2 = ((const struct utmpx *)u2)->ut_tv.tv_sec;
75 return (t1 < t2 ? order : t1 > t2 ? -order : 0);
76 }
77
78 int
main(int argc,char * argv[])79 main(int argc, char *argv[])
80 {
81 int ch, i, ulistsize;
82 struct utmpx *u, *ulist;
83
84 argc = xo_parse_args(argc, argv);
85 if (argc < 0)
86 exit(1);
87
88 while ((ch = getopt(argc, argv, "f:rt")) != -1) {
89 switch (ch) {
90 case 'f':
91 file = optarg;
92 break;
93 case 'r':
94 order = -1;
95 break;
96 case 't':
97 utcmp = utcmp_time;
98 break;
99 default:
100 usage();
101 }
102 }
103 argc -= optind;
104 argv += optind;
105
106 xo_open_container("lastlogin-information");
107 xo_open_list("lastlogin");
108
109 if (argc > 0) {
110 /* Process usernames given on the command line. */
111 for (i = 0; i < argc; i++) {
112 if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
113 xo_err(1, "failed to open lastlog database");
114 if ((u = getutxuser(argv[i])) == NULL) {
115 xo_warnx("user '%s' not found", argv[i]);
116 continue;
117 }
118 output(u);
119 endutxent();
120 }
121 } else {
122 /* Read all lastlog entries, looking for active ones. */
123 if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
124 xo_err(1, "failed to open lastlog database");
125 ulist = NULL;
126 ulistsize = 0;
127 while ((u = getutxent()) != NULL) {
128 if (u->ut_type != USER_PROCESS)
129 continue;
130 if ((ulistsize % 16) == 0) {
131 ulist = realloc(ulist,
132 (ulistsize + 16) * sizeof(struct utmpx));
133 if (ulist == NULL)
134 xo_err(1, "malloc");
135 }
136 ulist[ulistsize++] = *u;
137 }
138 endutxent();
139
140 qsort(ulist, ulistsize, sizeof(struct utmpx), utcmp);
141 for (i = 0; i < ulistsize; i++)
142 output(&ulist[i]);
143 }
144
145 xo_close_list("lastlogin");
146 xo_close_container("lastlogin-information");
147 xo_finish();
148
149 exit(0);
150 }
151
152 /* Duplicate the output of last(1) */
153 static void
output(struct utmpx * u)154 output(struct utmpx *u)
155 {
156 time_t t = u->ut_tv.tv_sec;
157
158 xo_open_instance("lastlogin");
159 xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}",
160 u->ut_user, u->ut_line, u->ut_host);
161 xo_attr("seconds", "%lu", (unsigned long)t);
162 xo_emit(" {:login-time/%.24s/%.24s}\n", ctime(&t));
163 xo_close_instance("lastlogin");
164 }
165
166 static void
usage(void)167 usage(void)
168 {
169 xo_error("usage: lastlogin [-f file] [-rt] [user ...]\n");
170 xo_finish();
171 exit(1);
172 }
173