1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <alloca.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
static int print_id_objects();
static bool flag_print_uid = false;
static bool flag_print_gid = false;
static bool flag_print_name = false;
static bool flag_print_gid_all = false;
int main(int argc, char** argv)
{
if (unveil("/etc/passwd", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil("/etc/group", "r") < 0) {
perror("unveil");
return 1;
}
if (unveil(nullptr, nullptr) < 0) {
perror("unveil");
return 1;
}
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
Core::ArgsParser args_parser;
args_parser.add_option(flag_print_uid, "Print UID", nullptr, 'u');
args_parser.add_option(flag_print_gid, "Print GID", nullptr, 'g');
args_parser.add_option(flag_print_gid_all, "Print all GIDs", nullptr, 'G');
args_parser.add_option(flag_print_name, "Print name", nullptr, 'n');
args_parser.parse(argc, argv);
if (flag_print_name && !(flag_print_uid || flag_print_gid || flag_print_gid_all)) {
warnln("cannot print only names or real IDs in default format");
return 1;
}
if (flag_print_uid + flag_print_gid + flag_print_gid_all > 1) {
warnln("cannot print \"only\" of more than one choice");
return 1;
}
int status = print_id_objects();
return status;
}
static bool print_uid_object(uid_t uid)
{
if (flag_print_name) {
struct passwd* pw = getpwuid(uid);
out("{}", pw ? pw->pw_name : "n/a");
} else
out("{}", uid);
return true;
}
static bool print_gid_object(gid_t gid)
{
if (flag_print_name) {
struct group* gr = getgrgid(gid);
out("{}", gr ? gr->gr_name : "n/a");
} else
out("{}", gid);
return true;
}
static bool print_gid_list()
{
int extra_gid_count = getgroups(0, nullptr);
if (extra_gid_count) {
auto* extra_gids = (gid_t*)alloca(extra_gid_count * sizeof(gid_t));
int rc = getgroups(extra_gid_count, extra_gids);
if (rc < 0) {
perror("\ngetgroups");
return false;
}
for (int g = 0; g < extra_gid_count; ++g) {
auto* gr = getgrgid(extra_gids[g]);
if (flag_print_name && gr)
out("{}", gr->gr_name);
else
out("{}", extra_gids[g]);
if (g != extra_gid_count - 1)
out(" ");
}
}
return true;
}
static bool print_full_id_list()
{
uid_t uid = getuid();
gid_t gid = getgid();
struct passwd* pw = getpwuid(uid);
struct group* gr = getgrgid(gid);
out("uid={}({}) gid={}({})", uid, pw ? pw->pw_name : "n/a", gid, gr ? gr->gr_name : "n/a");
int extra_gid_count = getgroups(0, nullptr);
if (extra_gid_count) {
auto* extra_gids = (gid_t*)alloca(extra_gid_count * sizeof(gid_t));
int rc = getgroups(extra_gid_count, extra_gids);
if (rc < 0) {
perror("\ngetgroups");
return false;
}
out(" groups=");
for (int g = 0; g < extra_gid_count; ++g) {
auto* gr = getgrgid(extra_gids[g]);
if (gr)
out("{}({})", extra_gids[g], gr->gr_name);
else
out("{}", extra_gids[g]);
if (g != extra_gid_count - 1)
out(",");
}
}
return true;
}
static int print_id_objects()
{
if (flag_print_uid) {
if (!print_uid_object(getuid()))
return 1;
} else if (flag_print_gid) {
if (!print_gid_object(getgid()))
return 1;
} else if (flag_print_gid_all) {
if (!print_gid_list())
return 1;
} else {
if (!print_full_id_list())
return 1;
}
outln();
return 0;
}
|
