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