src/test/test-udev.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   5   Copyright 2004-2012 Kay Sievers <kay@vrfy.org>
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <errno.h>
  24 #include <unistd.h>
  25 #include <sched.h>
  26 #include <sys/mount.h>
  27 #include <sys/signalfd.h>
  28
  29 #include "missing.h"
  30 #include "selinux-util.h"
  31 #include "signal-util.h"
  32 #include "udev.h"
  33 #include "udev-util.h"
  34
  35 static int fake_filesystems(void) {
  36         static const struct fakefs {
  37                 const char *src;
  38                 const char *target;
  39                 const char *error;
  40         } fakefss[] = {
  41                 { "test/sys", "/sys",                   "failed to mount test /sys" },
  42                 { "test/dev", "/dev",                   "failed to mount test /dev" },
  43                 { "test/run", "/run",                   "failed to mount test /run" },
  44                 { "test/run", "/etc/udev/rules.d",      "failed to mount empty /etc/udev/rules.d" },
  45                 { "test/run", "/usr/lib/udev/rules.d",  "failed to mount empty /usr/lib/udev/rules.d" },
  46         };
  47         unsigned int i;
  48         int err;
  49
  50         err = unshare(CLONE_NEWNS);
  51         if (err < 0) {
  52                 err = -errno;
  53                 fprintf(stderr, "failed to call unshare(): %m\n");
  54                 goto out;
  55         }
  56
  57         if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
  58                 err = -errno;
  59                 fprintf(stderr, "failed to mount / as private: %m\n");
  60                 goto out;
  61         }
  62
  63         for (i = 0; i < ELEMENTSOF(fakefss); i++) {
  64                 err = mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
  65                 if (err < 0) {
  66                         err = -errno;
  67                         fprintf(stderr, "%s %m", fakefss[i].error);
  68                         return err;
  69                 }
  70         }
  71 out:
  72         return err;
  73 }
  74
  75 int main(int argc, char *argv[]) {
  76         _cleanup_udev_unref_ struct udev *udev = NULL;
  77         _cleanup_udev_event_unref_ struct udev_event *event = NULL;
  78         _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
  79         _cleanup_udev_rules_unref_ struct udev_rules *rules = NULL;
  80         char syspath[UTIL_PATH_SIZE];
  81         const char *devpath;
  82         const char *action;
  83         int err;
  84
  85         err = fake_filesystems();
  86         if (err < 0)
  87                 return EXIT_FAILURE;
  88
  89         udev = udev_new();
  90         if (udev == NULL)
  91                 return EXIT_FAILURE;
  92
  93         log_debug("version %s", VERSION);
  94         mac_selinux_init("/dev");
  95
  96         action = argv[1];
  97         if (action == NULL) {
  98                 log_error("action missing");
  99                 goto out;
 100         }
 101
 102         devpath = argv[2];
 103         if (devpath == NULL) {
 104                 log_error("devpath missing");
 105                 goto out;
 106         }
 107
 108         rules = udev_rules_new(udev, 1);
 109
 110         strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL);
 111         dev = udev_device_new_from_synthetic_event(udev, syspath, action);
 112         if (dev == NULL) {
 113                 log_debug("unknown device '%s'", devpath);
 114                 goto out;
 115         }
 116
 117         event = udev_event_new(dev);
 118
 119         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
 120
 121         /* do what devtmpfs usually provides us */
 122         if (udev_device_get_devnode(dev) != NULL) {
 123                 mode_t mode = 0600;
 124
 125                 if (streq(udev_device_get_subsystem(dev), "block"))
 126                         mode |= S_IFBLK;
 127                 else
 128                         mode |= S_IFCHR;
 129
 130                 if (!streq(action, "remove")) {
 131                         mkdir_parents_label(udev_device_get_devnode(dev), 0755);
 132                         mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev));
 133                 } else {
 134                         unlink(udev_device_get_devnode(dev));
 135                         rmdir_parents(udev_device_get_devnode(dev), "/");
 136                 }
 137         }
 138
 139         udev_event_execute_rules(event,
 140                                  3 * USEC_PER_SEC, USEC_PER_SEC,
 141                                  NULL,
 142                                  rules);
 143         udev_event_execute_run(event,
 144                                3 * USEC_PER_SEC, USEC_PER_SEC);
 145 out:
 146         mac_selinux_finish();
 147
 148         return err ? EXIT_FAILURE : EXIT_SUCCESS;
 149 }