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add00535 LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2016 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <sched.h> | |
21 | ||
22 | #include "alloc-util.h" | |
23 | #include "extract-word.h" | |
24 | #include "nsflags.h" | |
add00535 LP |
25 | #include "string-util.h" |
26 | ||
27 | const struct namespace_flag_map namespace_flag_map[] = { | |
28 | { CLONE_NEWCGROUP, "cgroup" }, | |
29 | { CLONE_NEWIPC, "ipc" }, | |
30 | { CLONE_NEWNET, "net" }, | |
31 | /* So, the mount namespace flag is called CLONE_NEWNS for historical reasons. Let's expose it here under a more | |
32 | * explanatory name: "mnt". This is in-line with how the kernel exposes namespaces in /proc/$PID/ns. */ | |
33 | { CLONE_NEWNS, "mnt" }, | |
34 | { CLONE_NEWPID, "pid" }, | |
35 | { CLONE_NEWUSER, "user" }, | |
36 | { CLONE_NEWUTS, "uts" }, | |
37 | {} | |
38 | }; | |
39 | ||
40 | const char* namespace_flag_to_string(unsigned long flag) { | |
41 | unsigned i; | |
42 | ||
43 | flag &= NAMESPACE_FLAGS_ALL; | |
44 | ||
45 | for (i = 0; namespace_flag_map[i].name; i++) | |
46 | if (flag == namespace_flag_map[i].flag) | |
47 | return namespace_flag_map[i].name; | |
48 | ||
49 | return NULL; /* either unknown namespace flag, or a combination of many. This call supports neither. */ | |
50 | } | |
51 | ||
52 | unsigned long namespace_flag_from_string(const char *name) { | |
53 | unsigned i; | |
54 | ||
55 | if (isempty(name)) | |
56 | return 0; | |
57 | ||
58 | for (i = 0; namespace_flag_map[i].name; i++) | |
59 | if (streq(name, namespace_flag_map[i].name)) | |
60 | return namespace_flag_map[i].flag; | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | int namespace_flag_from_string_many(const char *name, unsigned long *ret) { | |
66 | unsigned long flags = 0; | |
67 | int r; | |
68 | ||
69 | assert_se(ret); | |
70 | ||
add00535 LP |
71 | for (;;) { |
72 | _cleanup_free_ char *word = NULL; | |
73 | unsigned long f; | |
74 | ||
75 | r = extract_first_word(&name, &word, NULL, 0); | |
76 | if (r < 0) | |
77 | return r; | |
78 | if (r == 0) | |
79 | break; | |
80 | ||
81 | f = namespace_flag_from_string(word); | |
82 | if (f == 0) | |
83 | return -EINVAL; | |
84 | ||
85 | flags |= f; | |
86 | } | |
87 | ||
88 | *ret = flags; | |
89 | return 0; | |
90 | } | |
91 | ||
92 | int namespace_flag_to_string_many(unsigned long flags, char **ret) { | |
93 | _cleanup_free_ char *s = NULL; | |
94 | unsigned i; | |
95 | ||
96 | for (i = 0; namespace_flag_map[i].name; i++) { | |
97 | if ((flags & namespace_flag_map[i].flag) != namespace_flag_map[i].flag) | |
98 | continue; | |
99 | ||
100 | if (!s) { | |
101 | s = strdup(namespace_flag_map[i].name); | |
102 | if (!s) | |
103 | return -ENOMEM; | |
104 | } else { | |
105 | if (!strextend(&s, " ", namespace_flag_map[i].name, NULL)) | |
106 | return -ENOMEM; | |
107 | } | |
108 | } | |
109 | ||
110 | if (!s) { | |
111 | s = strdup(""); | |
112 | if (!s) | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
116 | *ret = s; | |
117 | s = NULL; | |
118 | ||
119 | return 0; | |
120 | } |