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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <string.h>
#include "alloc-util.h"
#include "capability-util.h"
#include "cap-list.h"
#include "extract-word.h"
#include "macro.h"
#include "parse-util.h"
#include "stdio-util.h"
#include "util.h"
static const struct capability_name* lookup_capability(register const char *str, register GPERF_LEN_TYPE len);
#include "cap-from-name.h"
#include "cap-to-name.h"
const char *capability_to_name(int id) {
if (id < 0)
return NULL;
if ((size_t) id >= ELEMENTSOF(capability_names))
return NULL;
return capability_names[id];
}
int capability_from_name(const char *name) {
const struct capability_name *sc;
int r, i;
assert(name);
/* Try to parse numeric capability */
r = safe_atoi(name, &i);
if (r >= 0) {
if (i >= 0 && i < 64)
return i;
else
return -EINVAL;
}
/* Try to parse string capability */
sc = lookup_capability(name, strlen(name));
if (!sc)
return -EINVAL;
return sc->id;
}
/* This is the number of capability names we are *compiled* with.
* For the max capability number of the currently-running kernel,
* use cap_last_cap(). */
int capability_list_length(void) {
return (int) ELEMENTSOF(capability_names);
}
int capability_set_to_string_alloc(uint64_t set, char **s) {
_cleanup_free_ char *str = NULL;
size_t allocated = 0, n = 0;
assert(s);
for (unsigned i = 0; i <= cap_last_cap(); i++)
if (set & (UINT64_C(1) << i)) {
const char *p;
char buf[2 + 16 + 1];
size_t add;
p = capability_to_name(i);
if (!p) {
xsprintf(buf, "0x%x", i);
p = buf;
}
add = strlen(p);
if (!GREEDY_REALLOC(str, allocated, n + add + 2))
return -ENOMEM;
strcpy(mempcpy(str + n, p, add), " ");
n += add + 1;
}
if (!GREEDY_REALLOC(str, allocated, n + 1))
return -ENOMEM;
str[n > 0 ? n - 1 : 0] = '\0'; /* truncate the last space, if it's there */
*s = TAKE_PTR(str);
return 0;
}
int capability_set_from_string(const char *s, uint64_t *set) {
uint64_t val = 0;
assert(set);
for (const char *p = s;;) {
_cleanup_free_ char *word = NULL;
int r;
r = extract_first_word(&p, &word, NULL, EXTRACT_UNQUOTE);
if (r == -ENOMEM)
return r;
if (r <= 0)
break;
r = capability_from_name(word);
if (r < 0)
continue;
val |= ((uint64_t) UINT64_C(1)) << (uint64_t) r;
}
*set = val;
return 0;
}
|
