src/test/test-udev.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   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 "build.h"
  15 #include "device-private.h"
  16 #include "fs-util.h"
  17 #include "log.h"
  18 #include "main-func.h"
  19 #include "mkdir.h"
  20 #include "mount-util.h"
  21 #include "namespace-util.h"
  22 #include "selinux-util.h"
  23 #include "signal-util.h"
  24 #include "string-util.h"
  25 #include "tests.h"
  26 #include "udev-event.h"
  27
  28 static int fake_filesystems(void) {
  29         static const struct fakefs {
  30                 const char *src;
  31                 const char *target;
  32                 const char *error;
  33                 bool ignore_mount_error;
  34         } fakefss[] = {
  35                 { "test/tmpfs/sys", "/sys",                    "Failed to mount test /sys",                        false },
  36                 { "test/tmpfs/dev", "/dev",                    "Failed to mount test /dev",                        false },
  37                 { "test/run",       "/run",                    "Failed to mount test /run",                        false },
  38                 { "test/run",       "/etc/udev/rules.d",       "Failed to mount empty /etc/udev/rules.d",          true },
  39                 { "test/run",       UDEVLIBEXECDIR "/rules.d", "Failed to mount empty " UDEVLIBEXECDIR "/rules.d", true },
  40         };
  41         int r;
  42
  43         r = detach_mount_namespace();
  44         if (r < 0)
  45                 return log_error_errno(r, "Failed to detach mount namespace: %m");
  46
  47         for (size_t i = 0; i < ELEMENTSOF(fakefss); i++) {
  48                 r = mount_nofollow_verbose(fakefss[i].ignore_mount_error ? LOG_NOTICE : LOG_ERR,
  49                                            fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL);
  50                 if (r < 0 && !fakefss[i].ignore_mount_error)
  51                         return r;
  52         }
  53
  54         return 0;
  55 }
  56
  57 static int run(int argc, char *argv[]) {
  58         _cleanup_(udev_rules_freep) UdevRules *rules = NULL;
  59         _cleanup_(udev_event_freep) UdevEvent *event = NULL;
  60         _cleanup_(sd_device_unrefp) sd_device *dev = NULL;
  61         const char *devpath, *devname, *action;
  62         int r;
  63
  64         test_setup_logging(LOG_INFO);
  65
  66         if (!IN_SET(argc, 2, 3))
  67                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  68                                        "This program needs one or two arguments, %d given", argc - 1);
  69
  70         r = fake_filesystems();
  71         if (r < 0)
  72                 return r;
  73
  74         /* Let's make sure the test runs with selinux assumed disabled. */
  75 #if HAVE_SELINUX
  76         fini_selinuxmnt();
  77 #endif
  78         mac_selinux_retest();
  79
  80         if (argc == 2) {
  81                 if (!streq(argv[1], "check"))
  82                         return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
  83                                                "Unknown argument: %s", argv[1]);
  84
  85                 return 0;
  86         }
  87
  88         log_debug("version %s", GIT_VERSION);
  89
  90         r = mac_selinux_init();
  91         if (r < 0)
  92                 return r;
  93
  94         action = argv[1];
  95         devpath = argv[2];
  96
  97         assert_se(udev_rules_load(&rules, RESOLVE_NAME_EARLY) == 0);
  98
  99         const char *syspath;
 100         syspath = strjoina("/sys", devpath);
 101         r = device_new_from_synthetic_event(&dev, syspath, action);
 102         if (r < 0)
 103                 return log_debug_errno(r, "Failed to open device '%s'", devpath);
 104
 105         assert_se(event = udev_event_new(dev, 0, NULL));
 106
 107         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0);
 108
 109         /* do what devtmpfs usually provides us */
 110         if (sd_device_get_devname(dev, &devname) >= 0) {
 111                 const char *subsystem;
 112                 mode_t mode = 0600;
 113
 114                 if (sd_device_get_subsystem(dev, &subsystem) >= 0 && streq(subsystem, "block"))
 115                         mode |= S_IFBLK;
 116                 else
 117                         mode |= S_IFCHR;
 118
 119                 if (!streq(action, "remove")) {
 120                         dev_t devnum = makedev(0, 0);
 121
 122                         (void) mkdir_parents_label(devname, 0755);
 123                         (void) sd_device_get_devnum(dev, &devnum);
 124                         if (mknod(devname, mode, devnum) < 0)
 125                                 return log_error_errno(errno, "mknod() failed for '%s': %m", devname);
 126                 } else {
 127                         if (unlink(devname) < 0)
 128                                 return log_error_errno(errno, "unlink('%s') failed: %m", devname);
 129                         (void) rmdir_parents(devname, "/");
 130                 }
 131         }
 132
 133         udev_event_execute_rules(event, 3 * USEC_PER_SEC, SIGKILL, NULL, rules);
 134         udev_event_execute_run(event, 3 * USEC_PER_SEC, SIGKILL);
 135
 136         return 0;
 137 }
 138
 139 DEFINE_MAIN_FUNCTION(run);