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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/***
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 "device-private.h"
#include "fs-util.h"
#include "log.h"
#include "main-func.h"
#include "mkdir-label.h"
#include "mount-util.h"
#include "namespace-util.h"
#include "parse-util.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "string-util.h"
#include "tests.h"
#include "udev-event.h"
#include "udev-spawn.h"
#include "version.h"
static int device_new_from_synthetic_event(sd_device **ret, const char *syspath, const char *action) {
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
sd_device_action_t a;
int r;
assert(ret);
assert(syspath);
assert(action);
a = device_action_from_string(action);
if (a < 0)
return a;
r = sd_device_new_from_syspath(&dev, syspath);
if (r < 0)
return r;
r = device_read_uevent_file(dev);
if (r < 0)
return r;
r = device_set_action(dev, a);
if (r < 0)
return r;
*ret = TAKE_PTR(dev);
return 0;
}
static int fake_filesystems(void) {
static const struct fakefs {
const char *src;
const char *target;
const char *error;
bool ignore_mount_error;
} fakefss[] = {
{ "tmpfs/sys", "/sys", "Failed to mount test /sys", false },
{ "tmpfs/dev", "/dev", "Failed to mount test /dev", false },
{ "run", "/run", "Failed to mount test /run", false },
{ "run", "/etc/udev/rules.d", "Failed to mount empty /etc/udev/rules.d", true },
{ "run", UDEVLIBEXECDIR "/rules.d", "Failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
};
int r;
r = detach_mount_namespace();
if (r < 0)
return log_error_errno(r, "Failed to detach mount namespace: %m");
for (size_t i = 0; i < ELEMENTSOF(fakefss); i++) {
r = mount_nofollow_verbose(fakefss[i].ignore_mount_error ? LOG_NOTICE : LOG_ERR,
fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
if (r < 0 && !fakefss[i].ignore_mount_error)
return r;
}
return 0;
}
static int run(int argc, char *argv[]) {
_cleanup_(udev_rules_freep) UdevRules *rules = NULL;
_cleanup_(udev_event_freep) UdevEvent *event = NULL;
_cleanup_(sd_device_unrefp) sd_device *dev = NULL;
const char *devpath, *devname, *action;
int r;
test_setup_logging(LOG_INFO);
if (!IN_SET(argc, 2, 3, 4))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"This program needs between one and three arguments, %d given", argc - 1);
r = fake_filesystems();
if (r < 0)
return r;
/* Let's make sure the test runs with selinux assumed disabled. */
#if HAVE_SELINUX
fini_selinuxmnt();
#endif
mac_selinux_retest();
if (argc == 2) {
if (!streq(argv[1], "check"))
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"Unknown argument: %s", argv[1]);
return 0;
}
log_debug("version %s", GIT_VERSION);
r = mac_init();
if (r < 0)
return r;
action = argv[1];
devpath = argv[2];
if (argv[3]) {
unsigned us;
r = safe_atou(argv[3], &us);
if (r < 0)
return log_error_errno(r, "Invalid delay '%s': %m", argv[3]);
usleep_safe(us);
}
assert_se(udev_rules_load(&rules, RESOLVE_NAME_EARLY) == 0);
const char *syspath = strjoina("/sys", devpath);
r = device_new_from_synthetic_event(&dev, syspath, action);
if (r < 0)
return log_debug_errno(r, "Failed to open device '%s'", devpath);
assert_se(event = udev_event_new(dev, 0, NULL, log_get_max_level()));
assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
/* do what devtmpfs usually provides us */
if (sd_device_get_devname(dev, &devname) >= 0) {
const char *subsystem;
mode_t mode = 0600;
if (sd_device_get_subsystem(dev, &subsystem) >= 0 && streq(subsystem, "block"))
mode |= S_IFBLK;
else
mode |= S_IFCHR;
if (!streq(action, "remove")) {
dev_t devnum = makedev(0, 0);
(void) mkdir_parents_label(devname, 0755);
(void) sd_device_get_devnum(dev, &devnum);
if (mknod(devname, mode, devnum) < 0)
return log_error_errno(errno, "mknod() failed for '%s': %m", devname);
} else {
if (unlink(devname) < 0)
return log_error_errno(errno, "unlink('%s') failed: %m", devname);
(void) rmdir_parents(devname, "/dev");
}
}
udev_event_execute_rules(event, -1, 3 * USEC_PER_SEC, SIGKILL, NULL, rules);
udev_event_execute_run(event, 3 * USEC_PER_SEC, SIGKILL);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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