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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2016 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 <sched.h>
#include "alloc-util.h"
#include "extract-word.h"
#include "nsflags.h"
#include "string-util.h"
const struct namespace_flag_map namespace_flag_map[] = {
{ CLONE_NEWCGROUP, "cgroup" },
{ CLONE_NEWIPC, "ipc" },
{ CLONE_NEWNET, "net" },
/* So, the mount namespace flag is called CLONE_NEWNS for historical reasons. Let's expose it here under a more
* explanatory name: "mnt". This is in-line with how the kernel exposes namespaces in /proc/$PID/ns. */
{ CLONE_NEWNS, "mnt" },
{ CLONE_NEWPID, "pid" },
{ CLONE_NEWUSER, "user" },
{ CLONE_NEWUTS, "uts" },
{}
};
const char* namespace_flag_to_string(unsigned long flag) {
unsigned i;
flag &= NAMESPACE_FLAGS_ALL;
for (i = 0; namespace_flag_map[i].name; i++)
if (flag == namespace_flag_map[i].flag)
return namespace_flag_map[i].name;
return NULL; /* either unknown namespace flag, or a combination of many. This call supports neither. */
}
unsigned long namespace_flag_from_string(const char *name) {
unsigned i;
if (isempty(name))
return 0;
for (i = 0; namespace_flag_map[i].name; i++)
if (streq(name, namespace_flag_map[i].name))
return namespace_flag_map[i].flag;
return 0;
}
int namespace_flag_from_string_many(const char *name, unsigned long *ret) {
unsigned long flags = 0;
int r;
assert_se(ret);
for (;;) {
_cleanup_free_ char *word = NULL;
unsigned long f;
r = extract_first_word(&name, &word, NULL, 0);
if (r < 0)
return r;
if (r == 0)
break;
f = namespace_flag_from_string(word);
if (f == 0)
return -EINVAL;
flags |= f;
}
*ret = flags;
return 0;
}
int namespace_flag_to_string_many(unsigned long flags, char **ret) {
_cleanup_free_ char *s = NULL;
unsigned i;
for (i = 0; namespace_flag_map[i].name; i++) {
if ((flags & namespace_flag_map[i].flag) != namespace_flag_map[i].flag)
continue;
if (!s) {
s = strdup(namespace_flag_map[i].name);
if (!s)
return -ENOMEM;
} else {
if (!strextend(&s, " ", namespace_flag_map[i].name, NULL))
return -ENOMEM;
}
}
if (!s) {
s = strdup("");
if (!s)
return -ENOMEM;
}
*ret = s;
s = NULL;
return 0;
}
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