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1 | /* SPDX-License-Identifier: LGPL-2.1+ */ | |
2 | /*** | |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2003-2004 Greg Kroah-Hartman <greg@kroah.com> | |
6 | Copyright 2004-2012 Kay Sievers <kay@vrfy.org> | |
7 | ***/ | |
8 | ||
9 | #include <errno.h> | |
10 | #include <sched.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <sys/mount.h> | |
14 | #include <sys/signalfd.h> | |
15 | #include <unistd.h> | |
16 | ||
17 | #include "fs-util.h" | |
18 | #include "log.h" | |
19 | #include "missing.h" | |
20 | #include "selinux-util.h" | |
21 | #include "signal-util.h" | |
22 | #include "string-util.h" | |
23 | #include "udev-util.h" | |
24 | #include "udev.h" | |
25 | ||
26 | static int fake_filesystems(void) { | |
27 | static const struct fakefs { | |
28 | const char *src; | |
29 | const char *target; | |
30 | const char *error; | |
31 | bool ignore_mount_error; | |
32 | } fakefss[] = { | |
33 | { "test/tmpfs/sys", "/sys", "failed to mount test /sys", false }, | |
34 | { "test/tmpfs/dev", "/dev", "failed to mount test /dev", false }, | |
35 | { "test/run", "/run", "failed to mount test /run", false }, | |
36 | { "test/run", "/etc/udev/rules.d", "failed to mount empty /etc/udev/rules.d", true }, | |
37 | { "test/run", UDEVLIBEXECDIR "/rules.d", "failed to mount empty " UDEVLIBEXECDIR "/rules.d", true }, | |
38 | }; | |
39 | unsigned int i; | |
40 | ||
41 | if (unshare(CLONE_NEWNS) < 0) | |
42 | return log_error_errno(errno, "failed to call unshare(): %m"); | |
43 | ||
44 | if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) | |
45 | return log_error_errno(errno, "failed to mount / as private: %m"); | |
46 | ||
47 | for (i = 0; i < ELEMENTSOF(fakefss); i++) { | |
48 | if (mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL) < 0) { | |
49 | log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "%s: %m", fakefss[i].error); | |
50 | if (!fakefss[i].ignore_mount_error) | |
51 | return -errno; | |
52 | } | |
53 | } | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | int main(int argc, char *argv[]) { | |
59 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
60 | _cleanup_udev_event_unref_ struct udev_event *event = NULL; | |
61 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; | |
62 | _cleanup_udev_rules_unref_ struct udev_rules *rules = NULL; | |
63 | char syspath[UTIL_PATH_SIZE]; | |
64 | const char *devpath; | |
65 | const char *action; | |
66 | int err; | |
67 | ||
68 | log_parse_environment(); | |
69 | log_open(); | |
70 | ||
71 | err = fake_filesystems(); | |
72 | if (err < 0) | |
73 | return EXIT_FAILURE; | |
74 | ||
75 | udev = udev_new(); | |
76 | if (udev == NULL) | |
77 | return EXIT_FAILURE; | |
78 | ||
79 | log_debug("version %s", PACKAGE_VERSION); | |
80 | mac_selinux_init(); | |
81 | ||
82 | action = argv[1]; | |
83 | if (action == NULL) { | |
84 | log_error("action missing"); | |
85 | goto out; | |
86 | } | |
87 | ||
88 | devpath = argv[2]; | |
89 | if (devpath == NULL) { | |
90 | log_error("devpath missing"); | |
91 | goto out; | |
92 | } | |
93 | ||
94 | rules = udev_rules_new(udev, 1); | |
95 | ||
96 | strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL); | |
97 | dev = udev_device_new_from_synthetic_event(udev, syspath, action); | |
98 | if (dev == NULL) { | |
99 | log_debug("unknown device '%s'", devpath); | |
100 | goto out; | |
101 | } | |
102 | ||
103 | event = udev_event_new(dev); | |
104 | ||
105 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); | |
106 | ||
107 | /* do what devtmpfs usually provides us */ | |
108 | if (udev_device_get_devnode(dev) != NULL) { | |
109 | mode_t mode = 0600; | |
110 | ||
111 | if (streq(udev_device_get_subsystem(dev), "block")) | |
112 | mode |= S_IFBLK; | |
113 | else | |
114 | mode |= S_IFCHR; | |
115 | ||
116 | if (!streq(action, "remove")) { | |
117 | mkdir_parents_label(udev_device_get_devnode(dev), 0755); | |
118 | mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev)); | |
119 | } else { | |
120 | unlink(udev_device_get_devnode(dev)); | |
121 | rmdir_parents(udev_device_get_devnode(dev), "/"); | |
122 | } | |
123 | } | |
124 | ||
125 | udev_event_execute_rules(event, | |
126 | 3 * USEC_PER_SEC, USEC_PER_SEC, | |
127 | NULL, | |
128 | rules); | |
129 | udev_event_execute_run(event, | |
130 | 3 * USEC_PER_SEC, USEC_PER_SEC); | |
131 | out: | |
132 | mac_selinux_finish(); | |
133 | ||
134 | return err ? EXIT_FAILURE : EXIT_SUCCESS; | |
135 | } |