/*** 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 <stdlib.h> #include <errno.h> #include <unistd.h> #include <sched.h> #include <sys/mount.h> #include <sys/signalfd.h> #include "missing.h" #include "selinux-util.h" #include "signal-util.h" #include "udev.h" #include "udev-util.h" 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", "/usr/lib/udev/rules.d", "failed to mount empty /usr/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; 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"); 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; }