1 /*-
2 * Copyright (c) 2014 Pietro Cerutti <[email protected]>
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/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/capsicum.h>
34
35 #include <capsicum_helpers.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <utmpx.h>
39
40 #include <algorithm>
41 #include <iostream>
42 #include <iterator>
43 #include <set>
44 #include <string>
45 using namespace std;
46
47 int
main(int argc,char **)48 main(int argc, char **)
49 {
50 struct utmpx *ut;
51 set<string> names;
52
53 if (argc > 1) {
54 cerr << "usage: users" << endl;
55 return (1);
56 }
57
58 setutxent();
59
60 if (caph_enter())
61 err(1, "Failed to enter capability mode.");
62
63 while ((ut = getutxent()) != NULL)
64 if (ut->ut_type == USER_PROCESS)
65 names.insert(ut->ut_user);
66 endutxent();
67
68 if (!names.empty()) {
69 set<string>::iterator last = names.end();
70 --last;
71 copy(names.begin(), last, ostream_iterator<string>(cout, " "));
72 cout << *last << endl;
73 }
74 }
75