1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4
5 #include "alloc-util.h"
6 #include "extract-word.h"
7 #include "nsflags.h"
8 #include "string-util.h"
9
10 const struct namespace_flag_map namespace_flag_map[] = {
11 { CLONE_NEWCGROUP, "cgroup" },
12 { CLONE_NEWIPC, "ipc" },
13 { CLONE_NEWNET, "net" },
14 /* So, the mount namespace flag is called CLONE_NEWNS for historical reasons. Let's expose it here under a more
15 * explanatory name: "mnt". This is in-line with how the kernel exposes namespaces in /proc/$PID/ns. */
16 { CLONE_NEWNS, "mnt" },
17 { CLONE_NEWPID, "pid" },
18 { CLONE_NEWUSER, "user" },
19 { CLONE_NEWUTS, "uts" },
20 {}
21 };
22
namespace_flags_from_string(const char * name,unsigned long * ret)23 int namespace_flags_from_string(const char *name, unsigned long *ret) {
24 unsigned long flags = 0;
25 int r;
26
27 assert_se(ret);
28
29 for (;;) {
30 _cleanup_free_ char *word = NULL;
31 unsigned long f = 0;
32 unsigned i;
33
34 r = extract_first_word(&name, &word, NULL, 0);
35 if (r < 0)
36 return r;
37 if (r == 0)
38 break;
39
40 for (i = 0; namespace_flag_map[i].name; i++)
41 if (streq(word, namespace_flag_map[i].name)) {
42 f = namespace_flag_map[i].flag;
43 break;
44 }
45
46 if (f == 0)
47 return -EINVAL;
48
49 flags |= f;
50 }
51
52 *ret = flags;
53 return 0;
54 }
55
namespace_flags_to_string(unsigned long flags,char ** ret)56 int namespace_flags_to_string(unsigned long flags, char **ret) {
57 _cleanup_free_ char *s = NULL;
58 unsigned i;
59
60 for (i = 0; namespace_flag_map[i].name; i++) {
61 if ((flags & namespace_flag_map[i].flag) != namespace_flag_map[i].flag)
62 continue;
63
64 if (!strextend_with_separator(&s, " ", namespace_flag_map[i].name))
65 return -ENOMEM;
66 }
67
68 *ret = TAKE_PTR(s);
69
70 return 0;
71 }
72
namespace_single_flag_to_string(unsigned long flag)73 const char *namespace_single_flag_to_string(unsigned long flag) {
74 for (unsigned i = 0; namespace_flag_map[i].name; i++)
75 if (namespace_flag_map[i].flag == flag)
76 return namespace_flag_map[i].name;
77
78 return NULL;
79 }
80