jcs.org
Serenity Operating System
1/*
2 * Copyright (c) 2021, the SerenityOS developers.
3 *
4 * SPDX-License-Identifier: BSD-2-Clause
5 */
6
7#include <AK/DeprecatedString.h>
8#include <LibCore/ArgsParser.h>
9#include <LibCore/System.h>
10#include <LibMain/Main.h>
11#include <bits/posix1_lim.h>
12#include <unistd.h>
13
14ErrorOr<int> serenity_main(Main::Arguments arguments)
15{
16 TRY(Core::System::pledge("stdio rpath"));
17 bool fail = false;
18 static bool flag_most_posix = false;
19 static bool flag_portability = false;
20 static bool flag_empty_name_and_leading_dash = false;
21 Vector<DeprecatedString> paths;
22
23 Core::ArgsParser args_parser;
24 args_parser.add_option(flag_most_posix, "Check for most POSIX systems", nullptr, 'p');
25 args_parser.add_option(flag_empty_name_and_leading_dash, "Check for empty names and leading dash", nullptr, 'P');
26 args_parser.add_option(flag_portability, "Check portability (equivalent to -p and -P)", "portability", '\0');
27 args_parser.add_positional_argument(paths, "Path to check", "path", Core::ArgsParser::Required::Yes);
28 args_parser.parse(arguments);
29
30 if (flag_portability) {
31 flag_most_posix = true;
32 flag_empty_name_and_leading_dash = true;
33 }
34
35 for (auto& path : paths) {
36 unsigned long path_max = flag_most_posix ? _POSIX_PATH_MAX : pathconf(path.characters(), _PC_PATH_MAX);
37 unsigned long name_max = flag_most_posix ? _POSIX_NAME_MAX : pathconf(path.characters(), _PC_NAME_MAX);
38
39 if (path.length() > path_max) {
40 warnln("Limit {} exceeded by length {} of filename '{}'", path_max, path.length(), path);
41 fail = true;
42 continue;
43 }
44
45 if (flag_most_posix) {
46 // POSIX portable filename character set (a-z A-Z 0-9 . _ -)
47 for (long unsigned i = 0; i < path.length(); ++i) {
48 auto c = path[i];
49 if (!(c >= 'a' && c <= 'z') && !(c >= 'A' && c <= 'Z') && !(c >= '0' && c <= '9') && c != '/' && c != '.' && c != '-' && c != '_') {
50 warnln("Non-portable character '{}' in filename '{}'", path[i], path);
51 fail = true;
52 continue;
53 }
54 }
55 } else {
56 struct stat st;
57 if (lstat(path.characters(), &st) < 0) {
58 if (errno != ENOENT) {
59 warnln("Directory is not searchable '{}'", path);
60 fail = true;
61 continue;
62 }
63 }
64 }
65
66 if (flag_empty_name_and_leading_dash) {
67 if (path.is_empty()) {
68 warnln("Empty filename");
69 fail = true;
70 continue;
71 }
72 }
73
74 for (auto& component : path.split('/')) {
75 if (flag_empty_name_and_leading_dash) {
76 if (component.starts_with('-')) {
77 warnln("Leading '-' in a component of filename '{}'", path);
78 fail = true;
79 break;
80 }
81 }
82 if (component.length() > name_max) {
83 warnln("Limit {} exceeded by length {} of filename component '{}'", name_max, component.length(), component.characters());
84 fail = true;
85 break;
86 }
87 }
88 }
89
90 return fail;
91}