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>
42using namespace std;
43
44int
45main(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