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 <stddef.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <fcntl.h>
  26 #include <ctype.h>
  27 #include <errno.h>
  28 #include <unistd.h>
  29 #include <grp.h>
  30 #include <sched.h>
  31 #include <sys/mount.h>
  32 #include <sys/signalfd.h>
  33
  34 #include "missing.h"
  35 #include "udev.h"
  36 #include "udev-util.h"
  37
  38 static int fake_filesystems(void) {
  39         static const struct fakefs {
  40                 const char *src;
  41                 const char *target;
  42                 const char *error;
  43         } fakefss[] = {
  44                 { "test/sys", "/sys",                   "failed to mount test /sys" },
  45                 { "test/dev", "/dev",                   "failed to mount test /dev" },
  46                 { "test/run", "/run",                   "failed to mount test /run" },
  47                 { "test/run", "/etc/udev/rules.d",      "failed to mount empty /etc/udev/rules.d" },
  48                 { "test/run", "/usr/lib/udev/rules.d",  "failed to mount empty /usr/lib/udev/rules.d" },
  49         };
  50         unsigned int i;
  51         int err;
  52
  53         err = unshare(CLONE_NEWNS);
  54         if (err < 0) {
  55                 err = -errno;
  56                 fprintf(stderr, "failed to call unshare(): %m\n");
  57                 goto out;
  58         }
  59
  60         if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) < 0) {
  61                 err = -errno;
  62                 fprintf(stderr, "failed to mount / as private: %m\n");
  63                 goto out;
  64         }
  65
  66         for (i = 0; i < ELEMENTSOF(fakefss); i++) {
  67                 err = mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
  68                 if (err < 0) {
  69                         err = -errno;
  70                         fprintf(stderr, "%s %m", fakefss[i].error);
  71                         return err;
  72                 }
  73         }
  74 out:
  75         return err;
  76 }
  77
  78 int main(int argc, char *argv[]) {
  79         _cleanup_udev_unref_ struct udev *udev = NULL;
  80         _cleanup_udev_event_unref_ struct udev_event *event = NULL;
  81         _cleanup_udev_device_unref_ struct udev_device *dev = NULL;
  82         _cleanup_udev_rules_unref_ struct udev_rules *rules = NULL;
  83         char syspath[UTIL_PATH_SIZE];
  84         const char *devpath;
  85         const char *action;
  86         sigset_t mask, sigmask_orig;
  87         int err;
  88
  89         err = fake_filesystems();
  90         if (err < 0)
  91                 return EXIT_FAILURE;
  92
  93         udev = udev_new();
  94         if (udev == NULL)
  95                 return EXIT_FAILURE;
  96
  97         log_debug("version %s", VERSION);
  98         mac_selinux_init("/dev");
  99
 100         sigprocmask(SIG_SETMASK, NULL, &sigmask_orig);
 101
 102         action = argv[1];
 103         if (action == NULL) {
 104                 log_error("action missing");
 105                 goto out;
 106         }
 107
 108         devpath = argv[2];
 109         if (devpath == NULL) {
 110                 log_error("devpath missing");
 111                 goto out;
 112         }
 113
 114         rules = udev_rules_new(udev, 1);
 115
 116         strscpyl(syspath, sizeof(syspath), "/sys", devpath, NULL);
 117         dev = udev_device_new_from_syspath(udev, syspath);
 118         if (dev == NULL) {
 119                 log_debug("unknown device '%s'", devpath);
 120                 goto out;
 121         }
 122
 123         udev_device_set_action(dev, action);
 124         event = udev_event_new(dev);
 125
 126         sigfillset(&mask);
 127         sigprocmask(SIG_SETMASK, &mask, &sigmask_orig);
 128         event->fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
 129         if (event->fd_signal < 0) {
 130                 fprintf(stderr, "error creating signalfd\n");
 131                 goto out;
 132         }
 133
 134         /* do what devtmpfs usually provides us */
 135         if (udev_device_get_devnode(dev) != NULL) {
 136                 mode_t mode = 0600;
 137
 138                 if (streq(udev_device_get_subsystem(dev), "block"))
 139                         mode |= S_IFBLK;
 140                 else
 141                         mode |= S_IFCHR;
 142
 143                 if (!streq(action, "remove")) {
 144                         mkdir_parents_label(udev_device_get_devnode(dev), 0755);
 145                         mknod(udev_device_get_devnode(dev), mode, udev_device_get_devnum(dev));
 146                 } else {
 147                         unlink(udev_device_get_devnode(dev));
 148                         rmdir_parents(udev_device_get_devnode(dev), "/");
 149                 }
 150         }
 151
 152         udev_event_execute_rules(event, 3 * USEC_PER_SEC, USEC_PER_SEC, rules, &sigmask_orig);
 153         udev_event_execute_run(event, 3 * USEC_PER_SEC, USEC_PER_SEC, NULL);
 154 out:
 155         if (event != NULL && event->fd_signal >= 0)
 156                 close(event->fd_signal);
 157         mac_selinux_finish();
 158
 159         return err ? EXIT_FAILURE : EXIT_SUCCESS;
 160 }