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Serenity Operating System
1/*
2 * Copyright (c) 2020, Sergey Bugaev <bugaevc@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/StringView.h>
28#include <LibCore/ArgsParser.h>
29#include <stdio.h>
30#include <unistd.h>
31
32int main(int argc, char** argv)
33{
34 const char* path = nullptr;
35 const char* program = "/bin/Shell";
36 int flags = -1;
37
38 Core::ArgsParser args_parser;
39 args_parser.add_positional_argument(path, "New root directory", "path");
40 args_parser.add_positional_argument(program, "Program to run", "program", Core::ArgsParser::Required::No);
41
42 Core::ArgsParser::Option option {
43 true,
44 "Mount options",
45 "options",
46 'o',
47 "options",
48 [&flags](const char* s) {
49 flags = 0;
50 Vector<StringView> parts = StringView(s).split_view(',');
51 for (auto& part : parts) {
52 if (part == "defaults")
53 continue;
54 else if (part == "nodev")
55 flags |= MS_NODEV;
56 else if (part == "noexec")
57 flags |= MS_NOEXEC;
58 else if (part == "nosuid")
59 flags |= MS_NOSUID;
60 else if (part == "bind")
61 fprintf(stderr, "Ignoring -o bind, as it doesn't make sense for chroot\n");
62 else
63 return false;
64 }
65 return true;
66 }
67 };
68 args_parser.add_option(move(option));
69 args_parser.parse(argc, argv);
70
71 if (chroot_with_mount_flags(path, flags) < 0) {
72 perror("chroot");
73 return 1;
74 }
75
76 if (chdir("/") < 0) {
77 perror("chdir(/)");
78 return 1;
79 }
80
81 execl(program, program, nullptr);
82 perror("execl");
83 return 1;
84}