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Serenity Operating System
1/*
2 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.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 are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice, this
9 * list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <AK/String.h>
28#include <AK/Vector.h>
29#include <grp.h>
30#include <pwd.h>
31#include <stdio.h>
32#include <string.h>
33#include <sys/stat.h>
34#include <unistd.h>
35
36int main(int argc, char** argv)
37{
38 if (pledge("stdio rpath chown", nullptr) < 0) {
39 perror("pledge");
40 return 1;
41 }
42
43 if (argc < 3) {
44 printf("usage: chown <uid[:gid]> <path>\n");
45 return 0;
46 }
47
48 uid_t new_uid = -1;
49 gid_t new_gid = -1;
50
51 auto parts = String(argv[1]).split(':');
52 if (parts.is_empty()) {
53 fprintf(stderr, "Empty uid/gid spec\n");
54 return 1;
55 }
56
57 bool ok;
58 new_uid = parts[0].to_uint(ok);
59 if (!ok) {
60 auto* passwd = getpwnam(parts[0].characters());
61 if (!passwd) {
62 fprintf(stderr, "Unknown user '%s'\n", parts[0].characters());
63 return 1;
64 }
65 new_uid = passwd->pw_uid;
66 }
67
68 if (parts.size() == 2) {
69 new_gid = parts[1].to_uint(ok);
70 if (!ok) {
71 auto* group = getgrnam(parts[1].characters());
72 if (!new_gid) {
73 fprintf(stderr, "Unknown group '%s'\n", parts[1].characters());
74 return 1;
75 }
76 new_gid = group->gr_gid;
77 }
78 }
79
80 int rc = chown(argv[2], new_uid, new_gid);
81 if (rc < 0) {
82 perror("chown");
83 return 1;
84 }
85
86 return 0;
87}