projects / thirdparty / systemd.git / blame
| Commit | Line | Data |
|---|---|---|
| 53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
| c8b3094d | 2 | |
| 11c3a366 TA |
3 | #include <errno.h> |
| 4 | #include <fcntl.h> | |
| c8b3094d LP |
5 | #include <sys/ioctl.h> |
| 6 | #include <sys/stat.h> | |
| 7 | #include <linux/fs.h> | |
| 8 | ||
| 9 | #include "chattr-util.h" | |
| 10 | #include "fd-util.h" | |
| 11c3a366 | 11 | #include "macro.h" |
| c8b3094d LP |
12 | |
| 13 | int chattr_fd(int fd, unsigned value, unsigned mask) { | |
| 14 | unsigned old_attr, new_attr; | |
| 15 | struct stat st; | |
| 16 | ||
| 17 | assert(fd >= 0); | |
| 18 | ||
| 19 | if (fstat(fd, &st) < 0) | |
| 20 | return -errno; | |
| 21 | ||
| 22 | /* Explicitly check whether this is a regular file or | |
| 23 | * directory. If it is anything else (such as a device node or | |
| 24 | * fifo), then the ioctl will not hit the file systems but | |
| 25 | * possibly drivers, where the ioctl might have different | |
| 26 | * effects. Notably, DRM is using the same ioctl() number. */ | |
| 27 | ||
| 28 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
| 29 | return -ENOTTY; | |
| 30 | ||
| 31 | if (mask == 0) | |
| 32 | return 0; | |
| 33 | ||
| 34 | if (ioctl(fd, FS_IOC_GETFLAGS, &old_attr) < 0) | |
| 35 | return -errno; | |
| 36 | ||
| 37 | new_attr = (old_attr & ~mask) | (value & mask); | |
| 38 | if (new_attr == old_attr) | |
| 39 | return 0; | |
| 40 | ||
| 41 | if (ioctl(fd, FS_IOC_SETFLAGS, &new_attr) < 0) | |
| 42 | return -errno; | |
| 43 | ||
| 44 | return 1; | |
| 45 | } | |
| 46 | ||
| 47 | int chattr_path(const char *p, unsigned value, unsigned mask) { | |
| 48 | _cleanup_close_ int fd = -1; | |
| 49 | ||
| 50 | assert(p); | |
| 51 | ||
| 52 | if (mask == 0) | |
| 53 | return 0; | |
| 54 | ||
| 55 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
| 56 | if (fd < 0) | |
| 57 | return -errno; | |
| 58 | ||
| 59 | return chattr_fd(fd, value, mask); | |
| 60 | } | |
| 61 | ||
| 62 | int read_attr_fd(int fd, unsigned *ret) { | |
| 63 | struct stat st; | |
| 64 | ||
| 65 | assert(fd >= 0); | |
| 66 | ||
| 67 | if (fstat(fd, &st) < 0) | |
| 68 | return -errno; | |
| 69 | ||
| 70 | if (!S_ISDIR(st.st_mode) && !S_ISREG(st.st_mode)) | |
| 71 | return -ENOTTY; | |
| 72 | ||
| 73 | if (ioctl(fd, FS_IOC_GETFLAGS, ret) < 0) | |
| 74 | return -errno; | |
| 75 | ||
| 76 | return 0; | |
| 77 | } | |
| 78 | ||
| 79 | int read_attr_path(const char *p, unsigned *ret) { | |
| 80 | _cleanup_close_ int fd = -1; | |
| 81 | ||
| 82 | assert(p); | |
| 83 | assert(ret); | |
| 84 | ||
| 85 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW); | |
| 86 | if (fd < 0) | |
| 87 | return -errno; | |
| 88 | ||
| 89 | return read_attr_fd(fd, ret); | |
| 90 | } |