/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #include #include #if HAVE_AUDIT #include #endif #include "sd-bus.h" #include "alloc-util.h" #include "bus-error.h" #include "bus-util.h" #include "format-util.h" #include "log.h" #include "macro.h" #include "main-func.h" #include "process-util.h" #include "special.h" #include "stdio-util.h" #include "strv.h" #include "unit-name.h" #include "utmp-wtmp.h" typedef struct Context { sd_bus *bus; #if HAVE_AUDIT int audit_fd; #endif } Context; static void context_clear(Context *c) { assert(c); c->bus = sd_bus_flush_close_unref(c->bus); #if HAVE_AUDIT if (c->audit_fd >= 0) audit_close(c->audit_fd); c->audit_fd = -EBADF; #endif } static usec_t get_startup_monotonic_time(Context *c) { _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; usec_t t = 0; int r; assert(c); r = sd_bus_get_property_trivial( c->bus, "org.freedesktop.systemd1", "/org/freedesktop/systemd1", "org.freedesktop.systemd1.Manager", "UserspaceTimestampMonotonic", &error, 't', &t); if (r < 0) { log_error_errno(r, "Failed to get timestamp: %s", bus_error_message(&error, r)); return 0; } return t; } static int get_current_runlevel(Context *c) { static const struct { const int runlevel; const char *special; } table[] = { /* The first target of this list that is active or has * a job scheduled wins. We prefer runlevels 5 and 3 * here over the others, since these are the main * runlevels used on Fedora. It might make sense to * change the order on some distributions. */ { '5', SPECIAL_GRAPHICAL_TARGET }, { '3', SPECIAL_MULTI_USER_TARGET }, { '1', SPECIAL_RESCUE_TARGET }, }; _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; int r; assert(c); for (size_t i = 0; i < ELEMENTSOF(table); i++) { _cleanup_free_ char *state = NULL, *path = NULL; path = unit_dbus_path_from_name(table[i].special); if (!path) return log_oom(); r = sd_bus_get_property_string( c->bus, "org.freedesktop.systemd1", path, "org.freedesktop.systemd1.Unit", "ActiveState", &error, &state); if (r < 0) return log_warning_errno(r, "Failed to get state: %s", bus_error_message(&error, r)); if (STR_IN_SET(state, "active", "reloading")) return table[i].runlevel; } return 0; } static int on_reboot(Context *c) { int r = 0, q; usec_t t; usec_t boottime; assert(c); /* We finished start-up, so let's write the utmp * record and send the audit msg */ #if HAVE_AUDIT if (c->audit_fd >= 0) if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM) r = log_error_errno(errno, "Failed to send audit message: %m"); #endif /* If this call fails it will return 0, which * utmp_put_reboot() will then fix to the current time */ t = get_startup_monotonic_time(c); boottime = map_clock_usec(t, CLOCK_MONOTONIC, CLOCK_REALTIME); /* We query the recorded monotonic time here (instead of the system clock CLOCK_REALTIME), * even though we actually want the system clock time. That's because there's a likely * chance that the system clock wasn't set right during early boot. By manually converting * the monotonic clock to the system clock here we can compensate * for incorrectly set clocks during early boot. */ q = utmp_put_reboot(boottime); if (q < 0) r = log_error_errno(q, "Failed to write utmp record: %m"); return r; } static int on_shutdown(Context *c) { int r = 0, q; assert(c); /* We started shut-down, so let's write the utmp * record and send the audit msg */ #if HAVE_AUDIT if (c->audit_fd >= 0) if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM) r = log_error_errno(errno, "Failed to send audit message: %m"); #endif q = utmp_put_shutdown(); if (q < 0) r = log_error_errno(q, "Failed to write utmp record: %m"); return r; } static int on_runlevel(Context *c) { int r = 0, q, previous, runlevel; assert(c); /* We finished changing runlevel, so let's write the * utmp record and send the audit msg */ /* First, get last runlevel */ q = utmp_get_runlevel(&previous, NULL); if (q < 0) { if (!IN_SET(q, -ESRCH, -ENOENT)) return log_error_errno(q, "Failed to get current runlevel: %m"); previous = 0; } /* Secondly, get new runlevel */ runlevel = get_current_runlevel(c); if (runlevel < 0) return runlevel; if (runlevel == 0) { log_warning("Failed to get new runlevel, utmp update skipped."); return 0; } if (previous == runlevel) return 0; #if HAVE_AUDIT if (c->audit_fd >= 0) { char s[STRLEN("old-level=_ new-level=_") + 1]; xsprintf(s, "old-level=%c new-level=%c", previous > 0 ? previous : 'N', runlevel); if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM) r = log_error_errno(errno, "Failed to send audit message: %m"); } #endif q = utmp_put_runlevel(runlevel, previous); if (q < 0 && !IN_SET(q, -ESRCH, -ENOENT)) return log_error_errno(q, "Failed to write utmp record: %m"); return r; } static int run(int argc, char *argv[]) { _cleanup_(context_clear) Context c = { #if HAVE_AUDIT .audit_fd = -EBADF, #endif }; int r; if (argc != 2) return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "This program requires one argument."); log_setup(); umask(0022); #if HAVE_AUDIT /* If the kernel lacks netlink or audit support, don't worry about it. */ c.audit_fd = audit_open(); if (c.audit_fd < 0) log_full_errno(IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT) ? LOG_DEBUG : LOG_ERR, errno, "Failed to connect to audit log: %m"); #endif r = bus_connect_system_systemd(&c.bus); if (r < 0) return log_error_errno(r, "Failed to get D-Bus connection: %m"); if (streq(argv[1], "reboot")) return on_reboot(&c); if (streq(argv[1], "shutdown")) return on_shutdown(&c); if (streq(argv[1], "runlevel")) return on_runlevel(&c); return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Unknown command %s", argv[1]); } DEFINE_MAIN_FUNCTION(run);