src/test/test-udev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   6   Copyright 2004-2012 Kay Sievers <kay@vrfy.org>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <sched.h>
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <sys/mount.h>
  27 #include <sys/signalfd.h>
  28 #include <unistd.h>
  29
  30 #include "fs-util.h"
  31 #include "log.h"
  32 #include "missing.h"
  33 #include "selinux-util.h"
  34 #include "signal-util.h"
  35 #include "string-util.h"
  36 #include "udev-util.h"
  37 #include "udev.h"
  38
  39 static int fake_filesystems(void) {
  40         static const struct fakefs {
  41                 const char *src;
  42                 const char *target;
  43                 const char *error;
  44                 bool ignore_mount_error;
  45         } fakefss[] = {
  46                 { "test/tmpfs/sys", "/sys",                    "failed to mount test /sys",                        false },
  47                 { "test/tmpfs/dev", "/dev",                    "failed to mount test /dev",                        false },
  48                 { "test/run",       "/run",                    "failed to mount test /run",                        false },
  49                 { "test/run",       "/etc/udev/rules.d",       "failed to mount empty /etc/udev/rules.d",          true },
  50                 { "test/run",       UDEVLIBEXECDIR "/rules.d", "failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
  51         };
  52         unsigned int i;
  53
  54         if (unshare(CLONE_NEWNS) < 0)
  55                 return log_error_errno(errno, "failed to call unshare(): %m");
  56
  57         if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0)
  58                 return log_error_errno(errno, "failed to mount / as private: %m");
  59
  60         for (i = 0; i < ELEMENTSOF(fakefss); i++) {
  61                 if (mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL) < 0) {
  62                         log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "%s: %m", fakefss[i].error);
  63                         if (!fakefss[i].ignore_mount_error)
  64                                 return -errno;
  65                 }
  66         }
  67
  68         return 0;
  69 }
  70
  71 int main(int argc, char *argv[]) {
  72         _cleanup_udev_unref_ struct udev *udev = NULL;
  73         _cleanup_udev_event_unref_ struct udev_event *event = NULL;
  74         _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
  75         _cleanup_udev_rules_unref_ struct udev_rules *rules = NULL;
  76         char syspath[UTIL_PATH_SIZE];
  77         const char *devpath;
  78         const char *action;
  79         int err;
  80
  81         log_parse_environment();
  82         log_open();
  83
  84         err = fake_filesystems();
  85         if (err < 0)
  86                 return EXIT_FAILURE;
  87
  88         udev = udev_new();
  89         if (udev == NULL)
  90                 return EXIT_FAILURE;
  91
  92         log_debug("version %s", PACKAGE_VERSION);
  93         mac_selinux_init();
  94
  95         action = argv[1];
  96         if (action == NULL) {
  97                 log_error("action missing");
  98                 goto out;
  99         }
 100
 101         devpath = argv[2];
 102         if (devpath == NULL) {
 103                 log_error("devpath missing");
 104                 goto out;
 105         }
 106
 107         rules = udev_rules_new(udev, 1);
 108
 109         strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL);
 110         dev = udev_device_new_from_synthetic_event(udev, syspath, action);
 111         if (dev == NULL) {
 112                 log_debug("unknown device '%s'", devpath);
 113                 goto out;
 114         }
 115
 116         event = udev_event_new(dev);
 117
 118         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
 119
 120         /* do what devtmpfs usually provides us */
 121         if (udev_device_get_devnode(dev) != NULL) {
 122                 mode_t mode = 0600;
 123
 124                 if (streq(udev_device_get_subsystem(dev), "block"))
 125                         mode |= S_IFBLK;
 126                 else
 127                         mode |= S_IFCHR;
 128
 129                 if (!streq(action, "remove")) {
 130                         mkdir_parents_label(udev_device_get_devnode(dev), 0755);
 131                         mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev));
 132                 } else {
 133                         unlink(udev_device_get_devnode(dev));
 134                         rmdir_parents(udev_device_get_devnode(dev), "/");
 135                 }
 136         }
 137
 138         udev_event_execute_rules(event,
 139                                  3 * USEC_PER_SEC, USEC_PER_SEC,
 140                                  NULL,
 141                                  rules);
 142         udev_event_execute_run(event,
 143                                3 * USEC_PER_SEC, USEC_PER_SEC);
 144 out:
 145         mac_selinux_finish();
 146
 147         return err ? EXIT_FAILURE : EXIT_SUCCESS;
 148 }