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 <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <time.h>
45 #include <unistd.h>
46 #include <utmpx.h>
47
48 #include <libxo/xo.h>
49
50 #define LASTLOGIN_XO_VERSION "1"
51
52 int main(int, char **);
53 static void output(struct utmpx *);
54 static void usage(void);
55 static int utcmp_user(const void *, const void *);
56
57 static int order = 1;
58 static const char *file = NULL;
59 static int (*utcmp)(const void *, const void *) = utcmp_user;
60
61 static int
utcmp_user(const void * u1,const void * u2)62 utcmp_user(const void *u1, const void *u2)
63 {
64
65 return (order * strcmp(((const struct utmpx *)u1)->ut_user,
66 ((const struct utmpx *)u2)->ut_user));
67 }
68
69 static int
utcmp_time(const void * u1,const void * u2)70 utcmp_time(const void *u1, const void *u2)
71 {
72 time_t t1, t2;
73
74 t1 = ((const struct utmpx *)u1)->ut_tv.tv_sec;
75 t2 = ((const struct utmpx *)u2)->ut_tv.tv_sec;
76 return (t1 < t2 ? order : t1 > t2 ? -order : 0);
77 }
78
79 int
main(int argc,char * argv[])80 main(int argc, char *argv[])
81 {
82 int ch, i, ulistsize;
83 struct utmpx *u, *ulist;
84
85 argc = xo_parse_args(argc, argv);
86 if (argc < 0)
87 exit(1);
88
89 while ((ch = getopt(argc, argv, "f:rt")) != -1) {
90 switch (ch) {
91 case 'f':
92 file = optarg;
93 break;
94 case 'r':
95 order = -1;
96 break;
97 case 't':
98 utcmp = utcmp_time;
99 break;
100 default:
101 usage();
102 }
103 }
104 argc -= optind;
105 argv += optind;
106
107 xo_set_version(LASTLOGIN_XO_VERSION);
108 xo_open_container("lastlogin-information");
109 xo_open_list("lastlogin");
110
111 if (argc > 0) {
112 /* Process usernames given on the command line. */
113 for (i = 0; i < argc; i++) {
114 if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
115 xo_err(1, "failed to open lastlog database");
116 if ((u = getutxuser(argv[i])) == NULL) {
117 xo_warnx("user '%s' not found", argv[i]);
118 continue;
119 }
120 output(u);
121 endutxent();
122 }
123 } else {
124 /* Read all lastlog entries, looking for active ones. */
125 if (setutxdb(UTXDB_LASTLOGIN, file) != 0)
126 xo_err(1, "failed to open lastlog database");
127 ulist = NULL;
128 ulistsize = 0;
129 while ((u = getutxent()) != NULL) {
130 if (u->ut_type != USER_PROCESS)
131 continue;
132 if ((ulistsize % 16) == 0) {
133 ulist = realloc(ulist,
134 (ulistsize + 16) * sizeof(struct utmpx));
135 if (ulist == NULL)
136 xo_err(1, "malloc");
137 }
138 ulist[ulistsize++] = *u;
139 }
140 endutxent();
141
142 qsort(ulist, ulistsize, sizeof(struct utmpx), utcmp);
143 for (i = 0; i < ulistsize; i++)
144 output(&ulist[i]);
145 }
146
147 xo_close_list("lastlogin");
148 xo_close_container("lastlogin-information");
149 if (xo_finish() < 0)
150 xo_err(1, "stdout");
151
152 exit(0);
153 }
154
155 /* Duplicate the output of last(1) */
156 static void
output(struct utmpx * u)157 output(struct utmpx *u)
158 {
159 time_t t = u->ut_tv.tv_sec;
160
161 xo_open_instance("lastlogin");
162 xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}",
163 u->ut_user, u->ut_line, u->ut_host);
164 xo_attr("seconds", "%lu", (unsigned long)t);
165 xo_emit(" {:login-time/%.24s/%.24s}\n", ctime(&t));
166 xo_close_instance("lastlogin");
167 }
168
169 static void
usage(void)170 usage(void)
171 {
172 xo_error("usage: lastlogin [-f file] [-rt] [user ...]\n");
173 exit(1);
174 }
175