util: introduce our own gperf based capability list

[elogind.git] / src / shared / cap-list.c

diff --git a/src/shared/cap-list.c b/src/shared/cap-list.c
new file mode 100644 (file)
index 0000000..56d1488
--- /dev/null
+++ b/src/shared/cap-list.c
@@ -0,0 +1,62 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <linux/capability.h>
+#include <string.h>
+
+#include "util.h"
+#include "cap-list.h"
+#include "missing.h"
+
+static const struct capability_name* lookup_capability(register const char *str, register unsigned int len);
+
+#include "cap-to-name.h"
+#include "cap-from-name.h"
+
+const char *capability_to_name(int id) {
+
+        if (id < 0)
+                return NULL;
+
+        if (id >= (int) 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 && i >= 0)
+                return i;
+
+        /* Try to parse string capability */
+        sc = lookup_capability(name, strlen(name));
+        if (!sc)
+                return -EINVAL;
+
+        return sc->id;
+}