138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2014 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <string.h>
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#include "alloc-util.h"
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#include "capability-util.h"
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#include "cap-list.h"
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#include "extract-word.h"
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#include "macro.h"
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#include "missing.h"
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#include "parse-util.h"
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#include "util.h"
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static const struct capability_name* lookup_capability(register const char *str, register GPERF_LEN_TYPE len);
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#include "cap-from-name.h"
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#include "cap-to-name.h"
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const char *capability_to_name(int id) {
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if (id < 0)
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return NULL;
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if (id >= (int) ELEMENTSOF(capability_names))
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return NULL;
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return capability_names[id];
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}
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int capability_from_name(const char *name) {
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const struct capability_name *sc;
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int r, i;
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assert(name);
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/* Try to parse numeric capability */
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r = safe_atoi(name, &i);
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if (r >= 0) {
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if (i >= 0 && i < (int) ELEMENTSOF(capability_names))
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return i;
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else
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return -EINVAL;
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}
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/* Try to parse string capability */
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sc = lookup_capability(name, strlen(name));
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if (!sc)
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return -EINVAL;
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return sc->id;
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}
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int capability_list_length(void) {
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return (int) ELEMENTSOF(capability_names);
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}
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int capability_set_to_string_alloc(uint64_t set, char **s) {
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_cleanup_free_ char *str = NULL;
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unsigned long i;
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size_t allocated = 0, n = 0;
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assert(s);
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for (i = 0; i < cap_last_cap(); i++)
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if (set & (UINT64_C(1) << i)) {
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const char *p;
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size_t add;
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p = capability_to_name(i);
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if (!p)
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return -EINVAL;
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add = strlen(p);
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if (!GREEDY_REALLOC(str, allocated, n + add + 2))
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return -ENOMEM;
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strcpy(mempcpy(str + n, p, add), " ");
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n += add + 1;
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}
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if (!GREEDY_REALLOC(str, allocated, n + 1))
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return -ENOMEM;
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str[n > 0 ? n - 1 : 0] = '\0'; /* truncate the last space, if it's there */
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*s = TAKE_PTR(str);
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return 0;
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}
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int capability_set_from_string(const char *s, uint64_t *set) {
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uint64_t val = 0;
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const char *p;
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assert(set);
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for (p = s;;) {
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_cleanup_free_ char *word = NULL;
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int r;
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r = extract_first_word(&p, &word, NULL, EXTRACT_QUOTES);
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if (r == -ENOMEM)
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return r;
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if (r <= 0)
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break;
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r = capability_from_name(word);
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if (r < 0)
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continue;
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val |= ((uint64_t) UINT64_C(1)) << (uint64_t) r;
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}
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*set = val;
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return 0;
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}
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