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Diffstat (limited to '')
| -rw-r--r-- | src/test/test-udev.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/src/test/test-udev.c b/src/test/test-udev.c new file mode 100644 index 0000000..3ca132d --- /dev/null +++ b/src/test/test-udev.c @@ -0,0 +1,168 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ +/*** + Copyright © 2003-2004 Greg Kroah-Hartman <greg@kroah.com> +***/ + +#include <errno.h> +#include <sched.h> +#include <stdio.h> +#include <stdlib.h> +#include <sys/mount.h> +#include <sys/signalfd.h> +#include <unistd.h> + +#include "device-private.h" +#include "fs-util.h" +#include "log.h" +#include "main-func.h" +#include "mkdir-label.h" +#include "mount-util.h" +#include "namespace-util.h" +#include "selinux-util.h" +#include "signal-util.h" +#include "string-util.h" +#include "tests.h" +#include "udev-event.h" +#include "version.h" + +static int device_new_from_synthetic_event(sd_device **ret, const char *syspath, const char *action) { + _cleanup_(sd_device_unrefp) sd_device *dev = NULL; + sd_device_action_t a; + int r; + + assert(ret); + assert(syspath); + assert(action); + + a = device_action_from_string(action); + if (a < 0) + return a; + + r = sd_device_new_from_syspath(&dev, syspath); + if (r < 0) + return r; + + r = device_read_uevent_file(dev); + if (r < 0) + return r; + + r = device_set_action(dev, a); + if (r < 0) + return r; + + *ret = TAKE_PTR(dev); + return 0; +} + +static int fake_filesystems(void) { + static const struct fakefs { + const char *src; + const char *target; + const char *error; + bool ignore_mount_error; + } fakefss[] = { + { "test/tmpfs/sys", "/sys", "Failed to mount test /sys", false }, + { "test/tmpfs/dev", "/dev", "Failed to mount test /dev", false }, + { "test/run", "/run", "Failed to mount test /run", false }, + { "test/run", "/etc/udev/rules.d", "Failed to mount empty /etc/udev/rules.d", true }, + { "test/run", UDEVLIBEXECDIR "/rules.d", "Failed to mount empty " UDEVLIBEXECDIR "/rules.d", true }, + }; + int r; + + r = detach_mount_namespace(); + if (r < 0) + return log_error_errno(r, "Failed to detach mount namespace: %m"); + + for (size_t i = 0; i < ELEMENTSOF(fakefss); i++) { + r = mount_nofollow_verbose(fakefss[i].ignore_mount_error ? LOG_NOTICE : LOG_ERR, + fakefss[i].src, fakefss[i].target, NULL, MS_BIND, NULL); + if (r < 0 && !fakefss[i].ignore_mount_error) + return r; + } + + return 0; +} + +static int run(int argc, char *argv[]) { + _cleanup_(udev_rules_freep) UdevRules *rules = NULL; + _cleanup_(udev_event_freep) UdevEvent *event = NULL; + _cleanup_(sd_device_unrefp) sd_device *dev = NULL; + const char *devpath, *devname, *action; + int r; + + test_setup_logging(LOG_INFO); + + if (!IN_SET(argc, 2, 3)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "This program needs one or two arguments, %d given", argc - 1); + + r = fake_filesystems(); + if (r < 0) + return r; + + /* Let's make sure the test runs with selinux assumed disabled. */ +#if HAVE_SELINUX + fini_selinuxmnt(); +#endif + mac_selinux_retest(); + + if (argc == 2) { + if (!streq(argv[1], "check")) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "Unknown argument: %s", argv[1]); + + return 0; + } + + log_debug("version %s", GIT_VERSION); + + r = mac_selinux_init(); + if (r < 0) + return r; + + action = argv[1]; + devpath = argv[2]; + + assert_se(udev_rules_load(&rules, RESOLVE_NAME_EARLY) == 0); + + const char *syspath; + syspath = strjoina("/sys", devpath); + r = device_new_from_synthetic_event(&dev, syspath, action); + if (r < 0) + return log_debug_errno(r, "Failed to open device '%s'", devpath); + + assert_se(event = udev_event_new(dev, 0, NULL, log_get_max_level())); + + assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); + + /* do what devtmpfs usually provides us */ + if (sd_device_get_devname(dev, &devname) >= 0) { + const char *subsystem; + mode_t mode = 0600; + + if (sd_device_get_subsystem(dev, &subsystem) >= 0 && streq(subsystem, "block")) + mode |= S_IFBLK; + else + mode |= S_IFCHR; + + if (!streq(action, "remove")) { + dev_t devnum = makedev(0, 0); + + (void) mkdir_parents_label(devname, 0755); + (void) sd_device_get_devnum(dev, &devnum); + if (mknod(devname, mode, devnum) < 0) + return log_error_errno(errno, "mknod() failed for '%s': %m", devname); + } else { + if (unlink(devname) < 0) + return log_error_errno(errno, "unlink('%s') failed: %m", devname); + (void) rmdir_parents(devname, "/dev"); + } + } + + udev_event_execute_rules(event, -1, 3 * USEC_PER_SEC, SIGKILL, NULL, rules); + udev_event_execute_run(event, 3 * USEC_PER_SEC, SIGKILL); + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |