269 lines
7.6 KiB
C
269 lines
7.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#if HAVE_AUDIT
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#include <libaudit.h>
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#endif
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#include "sd-bus.h"
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#include "alloc-util.h"
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#include "bus-error.h"
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#include "bus-util.h"
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#include "format-util.h"
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#include "log.h"
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#include "macro.h"
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#include "process-util.h"
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#include "special.h"
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#include "strv.h"
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#include "unit-name.h"
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#include "util.h"
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#include "utmp-wtmp.h"
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typedef struct Context {
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sd_bus *bus;
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#if HAVE_AUDIT
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int audit_fd;
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#endif
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} Context;
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static usec_t get_startup_time(Context *c) {
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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usec_t t = 0;
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int r;
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assert(c);
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r = sd_bus_get_property_trivial(
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c->bus,
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"org.freedesktop.systemd1",
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"/org/freedesktop/systemd1",
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"org.freedesktop.systemd1.Manager",
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"UserspaceTimestamp",
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&error,
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't', &t);
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if (r < 0) {
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log_error_errno(r, "Failed to get timestamp: %s", bus_error_message(&error, r));
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return 0;
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}
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return t;
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}
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static int get_current_runlevel(Context *c) {
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static const struct {
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const int runlevel;
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const char *special;
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} table[] = {
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/* The first target of this list that is active or has
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* a job scheduled wins. We prefer runlevels 5 and 3
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* here over the others, since these are the main
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* runlevels used on Fedora. It might make sense to
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* change the order on some distributions. */
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{ '5', SPECIAL_GRAPHICAL_TARGET },
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{ '3', SPECIAL_MULTI_USER_TARGET },
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{ '1', SPECIAL_RESCUE_TARGET },
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};
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_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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int r;
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unsigned i;
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assert(c);
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for (i = 0; i < ELEMENTSOF(table); i++) {
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_cleanup_free_ char *state = NULL, *path = NULL;
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path = unit_dbus_path_from_name(table[i].special);
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if (!path)
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return log_oom();
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r = sd_bus_get_property_string(
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c->bus,
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"org.freedesktop.systemd1",
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path,
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"org.freedesktop.systemd1.Unit",
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"ActiveState",
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&error,
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&state);
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if (r < 0)
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return log_warning_errno(r, "Failed to get state: %s", bus_error_message(&error, r));
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if (STR_IN_SET(state, "active", "reloading"))
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return table[i].runlevel;
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}
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return 0;
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}
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static int on_reboot(Context *c) {
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int r = 0, q;
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usec_t t;
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assert(c);
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/* We finished start-up, so let's write the utmp
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* record and send the audit msg */
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#if HAVE_AUDIT
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if (c->audit_fd >= 0)
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if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 &&
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errno != EPERM) {
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r = log_error_errno(errno, "Failed to send audit message: %m");
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}
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#endif
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/* If this call fails it will return 0, which
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* utmp_put_reboot() will then fix to the current time */
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t = get_startup_time(c);
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q = utmp_put_reboot(t);
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if (q < 0) {
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log_error_errno(q, "Failed to write utmp record: %m");
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r = q;
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}
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return r;
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}
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static int on_shutdown(Context *c) {
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int r = 0, q;
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assert(c);
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/* We started shut-down, so let's write the utmp
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* record and send the audit msg */
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#if HAVE_AUDIT
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if (c->audit_fd >= 0)
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if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 &&
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errno != EPERM) {
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r = log_error_errno(errno, "Failed to send audit message: %m");
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}
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#endif
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q = utmp_put_shutdown();
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if (q < 0) {
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log_error_errno(q, "Failed to write utmp record: %m");
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r = q;
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}
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return r;
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}
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static int on_runlevel(Context *c) {
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int r = 0, q, previous, runlevel;
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assert(c);
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/* We finished changing runlevel, so let's write the
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* utmp record and send the audit msg */
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/* First, get last runlevel */
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q = utmp_get_runlevel(&previous, NULL);
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if (q < 0) {
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if (!IN_SET(q, -ESRCH, -ENOENT))
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return log_error_errno(q, "Failed to get current runlevel: %m");
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previous = 0;
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}
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/* Secondly, get new runlevel */
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runlevel = get_current_runlevel(c);
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if (runlevel < 0)
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return runlevel;
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if (previous == runlevel)
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return 0;
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#if HAVE_AUDIT
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if (c->audit_fd >= 0) {
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_cleanup_free_ char *s = NULL;
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if (asprintf(&s, "old-level=%c new-level=%c",
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previous > 0 ? previous : 'N',
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runlevel > 0 ? runlevel : 'N') < 0)
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return log_oom();
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if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && errno != EPERM)
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r = log_error_errno(errno, "Failed to send audit message: %m");
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}
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#endif
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q = utmp_put_runlevel(runlevel, previous);
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if (q < 0 && !IN_SET(q, -ESRCH, -ENOENT)) {
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log_error_errno(q, "Failed to write utmp record: %m");
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r = q;
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}
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return r;
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}
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int main(int argc, char *argv[]) {
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Context c = {
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#if HAVE_AUDIT
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.audit_fd = -1
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#endif
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};
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int r;
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if (getppid() != 1) {
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log_error("This program should be invoked by init only.");
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return EXIT_FAILURE;
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}
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if (argc != 2) {
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log_error("This program requires one argument.");
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return EXIT_FAILURE;
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}
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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#if HAVE_AUDIT
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/* If the kernel lacks netlink or audit support,
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* don't worry about it. */
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c.audit_fd = audit_open();
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if (c.audit_fd < 0 && !IN_SET(errno, EAFNOSUPPORT, EPROTONOSUPPORT))
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log_error_errno(errno, "Failed to connect to audit log: %m");
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#endif
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r = bus_connect_system_systemd(&c.bus);
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if (r < 0) {
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log_error_errno(r, "Failed to get D-Bus connection: %m");
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r = -EIO;
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goto finish;
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}
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log_debug("systemd-update-utmp running as pid "PID_FMT, getpid_cached());
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if (streq(argv[1], "reboot"))
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r = on_reboot(&c);
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else if (streq(argv[1], "shutdown"))
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r = on_shutdown(&c);
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else if (streq(argv[1], "runlevel"))
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r = on_runlevel(&c);
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else {
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log_error("Unknown command %s", argv[1]);
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r = -EINVAL;
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}
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log_debug("systemd-update-utmp stopped as pid "PID_FMT, getpid_cached());
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finish:
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#if HAVE_AUDIT
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if (c.audit_fd >= 0)
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audit_close(c.audit_fd);
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#endif
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sd_bus_flush_close_unref(c.bus);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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