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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
2822da4f LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2014 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU Lesser General Public License as published by | |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | Lesser General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU Lesser General Public License | |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
19 | ***/ | |
20 | ||
11c3a366 | 21 | #include <errno.h> |
2822da4f LP |
22 | #include <string.h> |
23 | ||
dd1f5bd0 YW |
24 | #include "alloc-util.h" |
25 | #include "capability-util.h" | |
2822da4f | 26 | #include "cap-list.h" |
dd1f5bd0 | 27 | #include "extract-word.h" |
93cc7779 | 28 | #include "macro.h" |
2822da4f | 29 | #include "missing.h" |
6bedfcbb LP |
30 | #include "parse-util.h" |
31 | #include "util.h" | |
2822da4f | 32 | |
c9f7b4d3 | 33 | static const struct capability_name* lookup_capability(register const char *str, register GPERF_LEN_TYPE len); |
2822da4f | 34 | |
2822da4f | 35 | #include "cap-from-name.h" |
cf0fbc49 | 36 | #include "cap-to-name.h" |
2822da4f LP |
37 | |
38 | const char *capability_to_name(int id) { | |
39 | ||
40 | if (id < 0) | |
41 | return NULL; | |
42 | ||
43 | if (id >= (int) ELEMENTSOF(capability_names)) | |
44 | return NULL; | |
45 | ||
46 | return capability_names[id]; | |
47 | } | |
48 | ||
49 | int capability_from_name(const char *name) { | |
50 | const struct capability_name *sc; | |
51 | int r, i; | |
52 | ||
53 | assert(name); | |
54 | ||
55 | /* Try to parse numeric capability */ | |
56 | r = safe_atoi(name, &i); | |
57 | if (r >= 0 && i >= 0) | |
58 | return i; | |
59 | ||
60 | /* Try to parse string capability */ | |
61 | sc = lookup_capability(name, strlen(name)); | |
62 | if (!sc) | |
63 | return -EINVAL; | |
64 | ||
65 | return sc->id; | |
66 | } | |
097df453 FB |
67 | |
68 | int capability_list_length(void) { | |
69 | return (int) ELEMENTSOF(capability_names); | |
70 | } | |
dd1f5bd0 YW |
71 | |
72 | int capability_set_to_string_alloc(uint64_t set, char **s) { | |
73 | _cleanup_free_ char *str = NULL; | |
74 | unsigned long i; | |
75 | size_t allocated = 0, n = 0; | |
76 | ||
77 | assert(s); | |
78 | ||
79 | for (i = 0; i < cap_last_cap(); i++) | |
80 | if (set & (UINT64_C(1) << i)) { | |
81 | const char *p; | |
82 | size_t add; | |
83 | ||
84 | p = capability_to_name(i); | |
85 | if (!p) | |
86 | return -EINVAL; | |
87 | ||
88 | add = strlen(p); | |
89 | ||
6088cefb | 90 | if (!GREEDY_REALLOC(str, allocated, n + add + 2)) |
dd1f5bd0 YW |
91 | return -ENOMEM; |
92 | ||
93 | strcpy(mempcpy(str + n, p, add), " "); | |
94 | n += add + 1; | |
95 | } | |
96 | ||
6088cefb ZJS |
97 | if (!GREEDY_REALLOC(str, allocated, n + 1)) |
98 | return -ENOMEM; | |
99 | ||
100 | str[n > 0 ? n - 1 : 0] = '\0'; /* truncate the last space, if it's there */ | |
dd1f5bd0 YW |
101 | |
102 | *s = str; | |
103 | str = NULL; | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | int capability_set_from_string(const char *s, uint64_t *set) { | |
109 | uint64_t val = 0; | |
110 | const char *p; | |
111 | ||
112 | assert(set); | |
113 | ||
114 | for (p = s;;) { | |
115 | _cleanup_free_ char *word = NULL; | |
116 | int r; | |
117 | ||
118 | r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES); | |
119 | if (r == -ENOMEM) | |
120 | return r; | |
121 | if (r <= 0) | |
122 | break; | |
123 | ||
124 | r = capability_from_name(word); | |
125 | if (r < 0) | |
126 | continue; | |
127 | ||
128 | val |= ((uint64_t) UINT64_C(1)) << (uint64_t) r; | |
129 | } | |
130 | ||
131 | *set = val; | |
132 | ||
133 | return 0; | |
134 | } |