1 /*-
2 * Copyright (c) 2014 Pietro Cerutti <gahr@FreeBSD.org>
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. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/capsicum.h>
31
32 #include <capsicum_helpers.h>
33 #include <err.h>
34 #include <errno.h>
35 #include <utmpx.h>
36
37 #include <algorithm>
38 #include <iostream>
39 #include <iterator>
40 #include <set>
41 #include <string>
42 using namespace std;
43
44 int
main(int argc,char **)45 main(int argc, char **)
46 {
47 struct utmpx *ut;
48 set<string> names;
49
50 if (argc > 1) {
51 cerr << "usage: users" << endl;
52 return (1);
53 }
54
55 setutxent();
56
57 if (caph_enter())
58 err(1, "Failed to enter capability mode.");
59
60 while ((ut = getutxent()) != NULL)
61 if (ut->ut_type == USER_PROCESS)
62 names.insert(ut->ut_user);
63 endutxent();
64
65 if (!names.empty()) {
66 set<string>::iterator last = names.end();
67 --last;
68 copy(names.begin(), last, ostream_iterator<string>(cout, " "));
69 cout << *last << endl;
70 }
71 }
72