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-rw-r--r--src/basic/cap-list.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/src/basic/cap-list.c b/src/basic/cap-list.c
new file mode 100644
index 0000000..fdc7948
--- /dev/null
+++ b/src/basic/cap-list.c
@@ -0,0 +1,122 @@
+/* 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 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, n + add + 2))
+ return -ENOMEM;
+
+ strcpy(mempcpy(str + n, p, add), " ");
+ n += add + 1;
+ }
+
+ if (!GREEDY_REALLOC(str, 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;
+}