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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 "device-private.h"
#include "fs-util.h"
#include "log.h"
#include "main-func.h"
#include "missing.h"
#include "mkdir.h"
#include "selinux-util.h"
#include "signal-util.h"
#include "string-util.h"
#include "tests.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 i;
if (unshare(CLONE_NEWNS) < 0)
return log_error_errno(errno, "Failed to call unshare(): %m");
if (mount(NULL, "/", NULL, MS_SLAVE|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;
}
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)) {
log_error("This program needs one or two arguments, %d given", argc - 1);
return -EINVAL;
}
r = fake_filesystems();
if (r < 0)
return r;
if (argc == 2) {
if (!streq(argv[1], "check")) {
log_error("Unknown argument: %s", argv[1]);
return -EINVAL;
}
return 0;
}
log_debug("version %s", PACKAGE_VERSION);
mac_selinux_init();
action = argv[1];
devpath = argv[2];
assert_se(udev_rules_new(&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));
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, "/");
}
}
udev_event_execute_rules(event, 3 * USEC_PER_SEC, NULL, rules);
udev_event_execute_run(event, 3 * USEC_PER_SEC);
return 0;
}
DEFINE_MAIN_FUNCTION(run);
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