src/test/test-udev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
   4 ***/
   5
   6 #include <errno.h>
   7 #include <sched.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <sys/mount.h>
  11 #include <sys/signalfd.h>
  12 #include <unistd.h>
  13
  14 #include "device-private.h"
  15 #include "fs-util.h"
  16 #include "log.h"
  17 #include "missing.h"
  18 #include "selinux-util.h"
  19 #include "signal-util.h"
  20 #include "string-util.h"
  21 #include "tests.h"
  22 #include "udev.h"
  23
  24 static int fake_filesystems(void) {
  25         static const struct fakefs {
  26                 const char *src;
  27                 const char *target;
  28                 const char *error;
  29                 bool ignore_mount_error;
  30         } fakefss[] = {
  31                 { "test/tmpfs/sys", "/sys",                    "Failed to mount test /sys",                        false },
  32                 { "test/tmpfs/dev", "/dev",                    "Failed to mount test /dev",                        false },
  33                 { "test/run",       "/run",                    "Failed to mount test /run",                        false },
  34                 { "test/run",       "/etc/udev/rules.d",       "Failed to mount empty /etc/udev/rules.d",          true },
  35                 { "test/run",       UDEVLIBEXECDIR "/rules.d", "Failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
  36         };
  37         unsigned i;
  38
  39         if (unshare(CLONE_NEWNS) < 0)
  40                 return log_error_errno(errno, "Failed to call unshare(): %m");
  41
  42         if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0)
  43                 return log_error_errno(errno, "Failed to mount / as private: %m");
  44
  45         for (i = 0; i < ELEMENTSOF(fakefss); i++)
  46                 if (mount(fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL) < 0) {
  47                         log_full_errno(fakefss[i].ignore_mount_error ? LOG_DEBUG : LOG_ERR, errno, "%s: %m", fakefss[i].error);
  48                         if (!fakefss[i].ignore_mount_error)
  49                                 return -errno;
  50                 }
  51
  52         return 0;
  53 }
  54
  55 int main(int argc, char *argv[]) {
  56         _cleanup_(udev_rules_unrefp) struct udev_rules *rules = NULL;
  57         _cleanup_(udev_event_freep) struct udev_event *event = NULL;
  58         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
  59         const char *devpath, *devname, *action;
  60         int r;
  61
  62         test_setup_logging(LOG_INFO);
  63
  64         if (argc != 3) {
  65                 log_error("This program needs two arguments, %d given", argc - 1);
  66                 return EXIT_FAILURE;
  67         }
  68
  69         if (fake_filesystems() < 0)
  70                 return EXIT_FAILURE;
  71
  72         log_debug("version %s", PACKAGE_VERSION);
  73         mac_selinux_init();
  74
  75         action = argv[1];
  76         devpath = argv[2];
  77
  78         rules = udev_rules_new(1);
  79
  80         const char *syspath = strjoina("/sys", devpath);
  81         r = device_new_from_synthetic_event(&dev, syspath, action);
  82         if (r < 0) {
  83                 log_debug_errno(r, "Failed to open device '%s'", devpath);
  84                 goto out;
  85         }
  86
  87         assert_se(event = udev_event_new(dev, 0, NULL));
  88
  89         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
  90
  91         /* do what devtmpfs usually provides us */
  92         if (sd_device_get_devname(dev, &devname) >= 0) {
  93                 const char *subsystem;
  94                 mode_t mode = 0600;
  95
  96                 if (sd_device_get_subsystem(dev, &subsystem) >= 0 && streq(subsystem, "block"))
  97                         mode |= S_IFBLK;
  98                 else
  99                         mode |= S_IFCHR;
 100
 101                 if (!streq(action, "remove")) {
 102                         dev_t devnum = makedev(0, 0);
 103
 104                         (void) mkdir_parents_label(devname, 0755);
 105                         (void) sd_device_get_devnum(dev, &devnum);
 106                         assert_se(mknod(devname, mode, devnum) == 0);
 107                 } else {
 108                         assert_se(unlink(devname) == 0);
 109                         (void) rmdir_parents(devname, "/");
 110                 }
 111         }
 112
 113         udev_event_execute_rules(event, 3 * USEC_PER_SEC, USEC_PER_SEC, NULL, rules);
 114         udev_event_execute_run(event, 3 * USEC_PER_SEC, USEC_PER_SEC);
 115 out:
 116         mac_selinux_finish();
 117
 118         return EXIT_SUCCESS;
 119 }