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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
Copyright © 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
***/
#include <errno.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <sys/signalfd.h>
#include <unistd.h>
#include "fs-util.h"
#include "log.h"
#include "missing.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "string-util.h"
#include "udev-util.h"
#include "udev.h"
static int fake_filesystems(void) {
static const struct fakefs {
const char *src;
const char *target;
const char *error;
bool ignore_mount_error;
} fakefss[] = {
{ "test/tmpfs/sys", "/sys", "failed to mount test /sys", false },
{ "test/tmpfs/dev", "/dev", "failed to mount test /dev", false },
{ "test/run", "/run", "failed to mount test /run", false },
{ "test/run", "/etc/udev/rules.d", "failed to mount empty /etc/udev/rules.d", true },
{ "test/run", UDEVLIBEXECDIR "/rules.d", "failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
};
unsigned int i;
if (unshare(CLONE_NEWNS) < 0)
return log_error_errno(errno, "failed to call unshare(): %m");
if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0)
return log_error_errno(errno, "failed to mount / as private: %m");
for (i = 0; i < ELEMENTSOF(fakefss); i++) {
if (mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL) < 0) {
log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "%s: %m", fakefss[i].error);
if (!fakefss[i].ignore_mount_error)
return -errno;
}
}
return 0;
}
int main(int argc, char *argv[]) {
_cleanup_(udev_unrefp) struct udev *udev = NULL;
_cleanup_(udev_event_unrefp) struct udev_event *event = NULL;
_cleanup_(udev_device_unrefp) struct udev_device *dev = NULL;
_cleanup_(udev_rules_unrefp) struct udev_rules *rules = NULL;
char syspath[UTIL_PATH_SIZE];
const char *devpath;
const char *action;
int err;
log_parse_environment();
log_open();
err = fake_filesystems();
if (err < 0)
return EXIT_FAILURE;
udev = udev_new();
if (udev == NULL)
return EXIT_FAILURE;
log_debug("version %s", PACKAGE_VERSION);
mac_selinux_init();
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);
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
/* 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);
udev_event_execute_run(event,
3 * USEC_PER_SEC, USEC_PER_SEC);
out:
mac_selinux_finish();
return err ? EXIT_FAILURE : EXIT_SUCCESS;
}
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