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c8b3094d LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2010 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 | ||
11c3a366 TA |
20 | #include <errno.h> |
21 | #include <fcntl.h> | |
c8b3094d LP |
22 | #include <sys/ioctl.h> |
23 | #include <sys/stat.h> | |
24 | #include <linux/fs.h> | |
25 | ||
26 | #include "chattr-util.h" | |
27 | #include "fd-util.h" | |
11c3a366 | 28 | #include "macro.h" |
c8b3094d LP |
29 | |
30 | int chattr_fd(int fd, unsigned value, unsigned mask) { | |
31 | unsigned old_attr, new_attr; | |
32 | struct stat st; | |
33 | ||
34 | assert(fd >= 0); | |
35 | ||
36 | if (fstat(fd, &st) < 0) | |
37 | return -errno; | |
38 | ||
39 | /* Explicitly check whether this is a regular file or | |
40 | * directory. If it is anything else (such as a device node or | |
41 | * fifo), then the ioctl will not hit the file systems but | |
42 | * possibly drivers, where the ioctl might have different | |
43 | * effects. Notably, DRM is using the same ioctl() number. */ | |
44 | ||
45 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
46 | return -ENOTTY; | |
47 | ||
48 | if (mask == 0) | |
49 | return 0; | |
50 | ||
51 | if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0) | |
52 | return -errno; | |
53 | ||
54 | new_attr = (old_attr & ~mask) | (value & mask); | |
55 | if (new_attr == old_attr) | |
56 | return 0; | |
57 | ||
58 | if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0) | |
59 | return -errno; | |
60 | ||
61 | return 1; | |
62 | } | |
63 | ||
64 | int chattr_path(const char *p, unsigned value, unsigned mask) { | |
65 | _cleanup_close_ int fd = -1; | |
66 | ||
67 | assert(p); | |
68 | ||
69 | if (mask == 0) | |
70 | return 0; | |
71 | ||
72 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
73 | if (fd < 0) | |
74 | return -errno; | |
75 | ||
76 | return chattr_fd(fd, value, mask); | |
77 | } | |
78 | ||
79 | int read_attr_fd(int fd, unsigned *ret) { | |
80 | struct stat st; | |
81 | ||
82 | assert(fd >= 0); | |
83 | ||
84 | if (fstat(fd, &st) < 0) | |
85 | return -errno; | |
86 | ||
87 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
88 | return -ENOTTY; | |
89 | ||
90 | if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0) | |
91 | return -errno; | |
92 | ||
93 | return 0; | |
94 | } | |
95 | ||
96 | int read_attr_path(const char *p, unsigned *ret) { | |
97 | _cleanup_close_ int fd = -1; | |
98 | ||
99 | assert(p); | |
100 | assert(ret); | |
101 | ||
102 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
103 | if (fd < 0) | |
104 | return -errno; | |
105 | ||
106 | return read_attr_fd(fd, ret); | |
107 | } |