1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
|
/***
This file is part of systemd.
Copyright 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
Copyright 2004-2012 Kay Sievers <kay@vrfy.org>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <grp.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/signalfd.h>
#include <linux/fs.h>
#include "udev.h"
#ifndef HAVE_UNSHARE
#include <sys/syscall.h>
/* Provide our own replacement with local reach*/
static inline int unshare (int x) { return syscall(SYS_unshare, x); }
#endif
#ifndef _USE_GNU
/* Make sure CLONE_NEWNS macro is available */
#include <linux/sched.h>
#endif
void udev_main_log(struct udev *udev, int priority,
const char *file, int line, const char *fn,
const char *format, va_list args) {}
static int fake_filesystems(void) {
static const struct fakefs {
const char *src;
const char *target;
const char *error;
} fakefss[] = {
{ "test/sys", "/sys", "failed to mount test /sys" },
{ "test/dev", "/dev", "failed to mount test /dev" },
{ "test/run", "/run", "failed to mount test /run" },
{ "test/run", "/etc/udev/rules.d", "failed to mount empty /etc/udev/rules.d" },
{ "test/run", "/lib/udev/rules.d", "failed to mount empty /lib/udev/rules.d" },
};
unsigned int i;
int err;
err = unshare(CLONE_NEWNS);
if (err < 0) {
err = -errno;
fprintf(stderr, "failed to call unshare(): %m\n");
goto out;
}
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
err = -errno;
fprintf(stderr, "failed to mount / as private: %m\n");
goto out;
}
for (i = 0; i < ELEMENTSOF(fakefss); i++) {
err = mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
if (err < 0) {
err = -errno;
fprintf(stderr, "%s %m", fakefss[i].error);
return err;
}
}
out:
return err;
}
int main(int argc, char *argv[]) {
struct udev *udev = NULL;
struct udev_event *event = NULL;
struct udev_device *dev = NULL;
struct udev_rules *rules = NULL;
char syspath[UTIL_PATH_SIZE];
const char *devpath;
const char *action;
sigset_t mask, sigmask_orig;
int err;
err = fake_filesystems();
if (err < 0)
return EXIT_FAILURE;
udev = udev_new();
if (udev == NULL)
return EXIT_FAILURE;
log_debug("version %s", VERSION);
label_init("/dev");
sigprocmask(SIG_SETMASK, NULL, &sigmask_orig);
action = argv[1];
if (action == NULL) {
log_error("action missing");
goto out;
}
devpath = argv[2];
if (devpath == NULL) {
log_error("devpath missing");
goto out;
}
rules = udev_rules_new(udev, 1);
strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL);
dev = udev_device_new_from_syspath(udev, syspath);
if (dev == NULL) {
log_debug("unknown device '%s'", devpath);
goto out;
}
udev_device_set_action(dev, action);
event = udev_event_new(dev);
sigfillset(&mask);
sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
event->fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
if (event->fd_signal < 0) {
fprintf(stderr, "error creating signalfd\n");
goto out;
}
/* do what devtmpfs usually provides us */
if (udev_device_get_devnode(dev) != NULL) {
mode_t mode = 0600;
if (streq(udev_device_get_subsystem(dev), "block"))
mode |= S_IFBLK;
else
mode |= S_IFCHR;
if (!streq(action, "remove")) {
mkdir_parents_label(udev_device_get_devnode(dev), 0755);
mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev));
} else {
unlink(udev_device_get_devnode(dev));
util_delete_path(udev, udev_device_get_devnode(dev));
}
}
udev_event_execute_rules(event, USEC_PER_SEC, rules, &sigmask_orig);
udev_event_execute_run(event, USEC_PER_SEC, NULL);
out:
if (event != NULL && event->fd_signal >= 0)
close(event->fd_signal);
udev_event_unref(event);
udev_device_unref(dev);
udev_rules_unref(rules);
label_finish();
udev_unref(udev);
return err ? EXIT_FAILURE : EXIT_SUCCESS;
}
|
