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/***
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 <grp.h>
#include <sched.h>
#include <sys/mount.h>
#include <sys/signalfd.h>
#include "missing.h"
#include "udev.h"
#include "udev-util.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
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", UDEV_ROOT_RUN, "failed to mount test " UDEV_ROOT_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[]) {
_cleanup_udev_unref_ struct udev *udev = NULL;
_cleanup_udev_event_unref_ struct udev_event *event = NULL;
_cleanup_udev_device_unref_ struct udev_device *dev = NULL;
_cleanup_udev_rules_unref_ 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);
mac_selinux_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_synthetic_event(udev, syspath, action);
if (dev == NULL) {
log_debug("unknown device '%s'", devpath);
goto out;
}
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));
rmdir_parents(udev_device_get_devnode(dev), "/");
}
}
udev_event_execute_rules(event,
3 * USEC_PER_SEC, USEC_PER_SEC,
NULL,
rules,
&sigmask_orig);
udev_event_execute_run(event,
3 * USEC_PER_SEC, USEC_PER_SEC,
NULL);
out:
if (event != NULL && event->fd_signal >= 0)
close(event->fd_signal);
mac_selinux_finish();
return err ? EXIT_FAILURE : EXIT_SUCCESS;
}
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