[thirdparty/systemd.git] / src / update-utmp.c

/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/

/***
  This file is part of systemd.

  Copyright 2010 Lennart Poettering

  systemd is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  systemd is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/

#include <assert.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

#include <dbus/dbus.h>

#ifdef HAVE_AUDIT
#include <libaudit.h>
#endif

#include "log.h"
#include "macro.h"
#include "util.h"
#include "special.h"
#include "utmp-wtmp.h"
#include "dbus-common.h"

typedef struct Context {
        DBusConnection *bus;
#ifdef HAVE_AUDIT
        int audit_fd;
#endif
} Context;

static usec_t get_startup_time(Context *c) {
        const char
                *interface = "org.freedesktop.systemd1.Manager",
                *property = "StartupTimestamp";

        DBusError error;
        usec_t t = 0;
        DBusMessage *m = NULL, *reply = NULL;
        DBusMessageIter iter, sub;

        dbus_error_init(&error);

        assert(c);

        if (!(m = dbus_message_new_method_call(
                              "org.freedesktop.systemd1",
                              "/org/freedesktop/systemd1",
                              "org.freedesktop.DBus.Properties",
                              "Get"))) {
                log_error("Could not allocate message.");
                goto finish;
        }

        if (!dbus_message_append_args(m,
                                      DBUS_TYPE_STRING, &interface,
                                      DBUS_TYPE_STRING, &property,
                                      DBUS_TYPE_INVALID)) {
                log_error("Could not append arguments to message.");
                goto finish;
        }

        if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
                log_error("Failed to send command: %s", bus_error_message(&error));
                goto finish;
        }

        if (!dbus_message_iter_init(reply, &iter) ||
            dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)  {
                log_error("Failed to parse reply.");
                goto finish;
        }

        dbus_message_iter_recurse(&iter, &sub);

        if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT64)  {
                log_error("Failed to parse reply.");
                goto finish;
        }

        dbus_message_iter_get_basic(&sub, &t);

finish:
        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        dbus_error_free(&error);

        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_RUNLEVEL5_TARGET },
                { '3', SPECIAL_RUNLEVEL3_TARGET },
                { '4', SPECIAL_RUNLEVEL4_TARGET },
                { '2', SPECIAL_RUNLEVEL2_TARGET },
                { 'S', SPECIAL_RESCUE_TARGET },
        };
        const char
                *interface = "org.freedesktop.systemd1.Unit",
                *property = "ActiveState";

        DBusMessage *m = NULL, *reply = NULL;
        int r = 0;
        unsigned i;
        DBusError error;

        assert(c);

        dbus_error_init(&error);

        for (i = 0; i < ELEMENTSOF(table); i++) {
                const char *path = NULL, *state;
                DBusMessageIter iter, sub;

                if (!(m = dbus_message_new_method_call(
                                      "org.freedesktop.systemd1",
                                      "/org/freedesktop/systemd1",
                                      "org.freedesktop.systemd1.Manager",
                                      "GetUnit"))) {
                        log_error("Could not allocate message.");
                        r = -ENOMEM;
                        goto finish;
                }

                if (!dbus_message_append_args(m,
                                              DBUS_TYPE_STRING, &table[i].special,
                                              DBUS_TYPE_INVALID)) {
                        log_error("Could not append arguments to message.");
                        r = -ENOMEM;
                        goto finish;
                }

                if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
                        dbus_error_free(&error);
                        continue;
                }

                if (!dbus_message_get_args(reply, &error,
                                           DBUS_TYPE_OBJECT_PATH, &path,
                                           DBUS_TYPE_INVALID)) {
                        log_error("Failed to parse reply: %s", bus_error_message(&error));
                        r = -EIO;
                        goto finish;
                }

                dbus_message_unref(m);
                if (!(m = dbus_message_new_method_call(
                                      "org.freedesktop.systemd1",
                                      path,
                                      "org.freedesktop.DBus.Properties",
                                      "Get"))) {
                        log_error("Could not allocate message.");
                        r = -ENOMEM;
                        goto finish;
                }

                if (!dbus_message_append_args(m,
                                              DBUS_TYPE_STRING, &interface,
                                              DBUS_TYPE_STRING, &property,
                                              DBUS_TYPE_INVALID)) {
                        log_error("Could not append arguments to message.");
                        r = -ENOMEM;
                        goto finish;
                }

                dbus_message_unref(reply);
                if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
                        log_error("Failed to send command: %s", bus_error_message(&error));
                        r = -EIO;
                        goto finish;
                }

                if (!dbus_message_iter_init(reply, &iter) ||
                    dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT)  {
                        log_error("Failed to parse reply.");
                        r = -EIO;
                        goto finish;
                }

                dbus_message_iter_recurse(&iter, &sub);

                if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING)  {
                        log_error("Failed to parse reply.");
                        r = -EIO;
                        goto finish;
                }

                dbus_message_iter_get_basic(&sub, &state);

                if (streq(state, "active") || streq(state, "reloading"))
                        r = table[i].runlevel;

                dbus_message_unref(m);
                dbus_message_unref(reply);
                m = reply = NULL;

                if (r)
                        break;
        }

finish:
        if (m)
                dbus_message_unref(m);

        if (reply)
                dbus_message_unref(reply);

        dbus_error_free(&error);

        return r;
}

static int on_reboot(Context *c) {
        int r = 0, q;
        usec_t t;

        assert(c);

        /* We finished start-up, so let's write the utmp
         * record and send the audit msg */

#ifdef HAVE_AUDIT
        if (c->audit_fd >= 0)
                if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0) {
                        log_error("Failed to send audit message: %m");
                        r = -errno;
                }
#endif

        /* If this call fails it will return 0, which
         * utmp_put_reboot() will then fix to the current time */
        t = get_startup_time(c);

        if ((q = utmp_put_reboot(t)) < 0) {
                log_error("Failed to write utmp record: %s", strerror(-q));
                r = q;
        }

        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 */

#ifdef HAVE_AUDIT
        if (c->audit_fd >= 0)
                if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "init", NULL, NULL, NULL, 1) < 0) {
                        log_error("Failed to send audit message: %m");
                        r = -errno;
                }
#endif

        if ((q = utmp_put_shutdown()) < 0) {
                log_error("Failed to write utmp record: %s", strerror(-q));
                r = q;
        }

        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 */
        if ((q = utmp_get_runlevel(&previous, NULL)) < 0) {

                if (q != -ESRCH && q != -ENOENT) {
                        log_error("Failed to get current runlevel: %s", strerror(-q));
                        return q;
                }

                /* Hmm, we didn't find any runlevel, that means we
                 * have been rebooted */
                r = on_reboot(c);
                previous = 0;
        }

        /* Secondly, get new runlevel */
        if ((runlevel = get_current_runlevel(c)) < 0)
                return runlevel;

        if (previous == runlevel)
                return 0;

#ifdef HAVE_AUDIT
        if (c->audit_fd >= 0) {
                char *s = NULL;

                if (asprintf(&s, "old-level=%c new-level=%c",
                             previous > 0 ? previous : 'N',
                             runlevel > 0 ? runlevel : 'N') < 0)
                        return -ENOMEM;

                if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0) {
                        log_error("Failed to send audit message: %m");
                        r = -errno;
                }

                free(s);
        }
#endif

        if ((q = utmp_put_runlevel(runlevel, previous)) < 0) {
                log_error("Failed to write utmp record: %s", strerror(-q));
                r = q;
        }

        return r;
}

int main(int argc, char *argv[]) {
        int r;
        DBusError error;
        Context c;

        dbus_error_init(&error);

        zero(c);
#ifdef HAVE_AUDIT
        c.audit_fd = -1;
#endif

        if (getppid() != 1) {
                log_error("This program should be invoked by init only.");
                return EXIT_FAILURE;
        }

        if (argc != 2) {
                log_error("This program requires one argument.");
                return EXIT_FAILURE;
        }

        log_set_target(LOG_TARGET_AUTO);
        log_parse_environment();
        log_open();

        umask(0022);

#ifdef HAVE_AUDIT
        if ((c.audit_fd = audit_open()) < 0 &&
            /* If the kernel lacks netlink or audit support,
             * don't worry about it. */
            errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
                log_error("Failed to connect to audit log: %m");
#endif

        if (bus_connect(DBUS_BUS_SYSTEM, &c.bus, NULL, &error) < 0) {
                log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
                r = -EIO;
                goto finish;
        }

        log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid());

        if (streq(argv[1], "reboot"))
                r = on_reboot(&c);
        else if (streq(argv[1], "shutdown"))
                r = on_shutdown(&c);
        else if (streq(argv[1], "runlevel"))
                r = on_runlevel(&c);
        else {
                log_error("Unknown command %s", argv[1]);
                r = -EINVAL;
        }

        log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid());

finish:
#ifdef HAVE_AUDIT
        if (c.audit_fd >= 0)
                audit_close(c.audit_fd);
#endif

        if (c.bus) {
                dbus_connection_flush(c.bus);
                dbus_connection_close(c.bus);
                dbus_connection_unref(c.bus);
        }

        dbus_error_free(&error);
        dbus_shutdown();

        return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
}
Commit	Line	Data
d6c9574f	1	/-- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil --/
4927fcae LP	2
	3	/***
	4	This file is part of systemd.
	5
	6	Copyright 2010 Lennart Poettering
	7
	8	systemd is free software; you can redistribute it and/or modify it
	9	under the terms of the GNU General Public License as published by
	10	the Free Software Foundation; either version 2 of the License, or
	11	(at your option) any later version.
	12
	13	systemd is distributed in the hope that it will be useful, but
	14	WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with systemd; If not, see <http://www.gnu.org/licenses/>.
	20	***/
	21
	22	#include <assert.h>
	23	#include <errno.h>
	24	#include <string.h>
4927fcae LP	25	#include <sys/types.h>
	26	#include <unistd.h>
	27
	28	#include <dbus/dbus.h>
	29
830f6caa LP	30	#ifdef HAVE_AUDIT
	31	#include <libaudit.h>
	32	#endif
	33
4927fcae LP	34	#include "log.h"
	35	#include "macro.h"
	36	#include "util.h"
	37	#include "special.h"
	38	#include "utmp-wtmp.h"
	39	#include "dbus-common.h"
	40
	41	typedef struct Context {
	42	DBusConnection *bus;
	43	#ifdef HAVE_AUDIT
	44	int audit_fd;
	45	#endif
	46	} Context;
	47
	48	static usec_t get_startup_time(Context *c) {
	49	const char
	50	*interface = "org.freedesktop.systemd1.Manager",
	51	*property = "StartupTimestamp";
	52
	53	DBusError error;
	54	usec_t t = 0;
	55	DBusMessage m = NULL, reply = NULL;
	56	DBusMessageIter iter, sub;
	57
	58	dbus_error_init(&error);
	59
	60	assert(c);
	61
	62	if (!(m = dbus_message_new_method_call(
	63	"org.freedesktop.systemd1",
	64	"/org/freedesktop/systemd1",
	65	"org.freedesktop.DBus.Properties",
	66	"Get"))) {
	67	log_error("Could not allocate message.");
	68	goto finish;
	69	}
	70
	71	if (!dbus_message_append_args(m,
	72	DBUS_TYPE_STRING, &interface,
	73	DBUS_TYPE_STRING, &property,
	74	DBUS_TYPE_INVALID)) {
	75	log_error("Could not append arguments to message.");
	76	goto finish;
	77	}
	78
	79	if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
4cf5d675	80	log_error("Failed to send command: %s", bus_error_message(&error));
4927fcae LP	81	goto finish;
	82	}
	83
	84	if (!dbus_message_iter_init(reply, &iter) \|\|
	85	dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
	86	log_error("Failed to parse reply.");
	87	goto finish;
	88	}
	89
	90	dbus_message_iter_recurse(&iter, &sub);
	91
	92	if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_UINT64) {
	93	log_error("Failed to parse reply.");
	94	goto finish;
	95	}
	96
	97	dbus_message_iter_get_basic(&sub, &t);
	98
	99	finish:
	100	if (m)
	101	dbus_message_unref(m);
	102
	103	if (reply)
	104	dbus_message_unref(reply);
	105
	106	dbus_error_free(&error);
	107
	108	return t;
	109	}
	110
	111	static int get_current_runlevel(Context *c) {
	112	static const struct {
	113	const int runlevel;
	114	const char *special;
	115	} table[] = {
	116	/* The first target of this list that is active or has
ee2083d5 LP	117	* a job scheduled wins. We prefer runlevels 5 and 3
	118	* here over the others, since these are the main
	119	* runlevels used on Fedora. It might make sense to
	120	* change the order on some distributions. */
4927fcae	121	{ '5', SPECIAL_RUNLEVEL5_TARGET },
4927fcae	122	{ '3', SPECIAL_RUNLEVEL3_TARGET },
3006982d	123	{ '4', SPECIAL_RUNLEVEL4_TARGET },
4927fcae	124	{ '2', SPECIAL_RUNLEVEL2_TARGET },
3006982d	125	{ 'S', SPECIAL_RESCUE_TARGET },
4927fcae LP	126	};
	127	const char
	128	*interface = "org.freedesktop.systemd1.Unit",
	129	*property = "ActiveState";
	130
	131	DBusMessage m = NULL, reply = NULL;
	132	int r = 0;
	133	unsigned i;
	134	DBusError error;
	135
	136	assert(c);
	137
	138	dbus_error_init(&error);
	139
	140	for (i = 0; i < ELEMENTSOF(table); i++) {
	141	const char path = NULL, state;
	142	DBusMessageIter iter, sub;
	143
	144	if (!(m = dbus_message_new_method_call(
	145	"org.freedesktop.systemd1",
	146	"/org/freedesktop/systemd1",
	147	"org.freedesktop.systemd1.Manager",
	148	"GetUnit"))) {
	149	log_error("Could not allocate message.");
	150	r = -ENOMEM;
	151	goto finish;
	152	}
	153
	154	if (!dbus_message_append_args(m,
	155	DBUS_TYPE_STRING, &table[i].special,
	156	DBUS_TYPE_INVALID)) {
	157	log_error("Could not append arguments to message.");
	158	r = -ENOMEM;
	159	goto finish;
	160	}
	161
	162	if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
	163	dbus_error_free(&error);
	164	continue;
	165	}
	166
	167	if (!dbus_message_get_args(reply, &error,
	168	DBUS_TYPE_OBJECT_PATH, &path,
	169	DBUS_TYPE_INVALID)) {
4cf5d675	170	log_error("Failed to parse reply: %s", bus_error_message(&error));
4927fcae LP	171	r = -EIO;
	172	goto finish;
	173	}
	174
	175	dbus_message_unref(m);
	176	if (!(m = dbus_message_new_method_call(
	177	"org.freedesktop.systemd1",
	178	path,
	179	"org.freedesktop.DBus.Properties",
	180	"Get"))) {
	181	log_error("Could not allocate message.");
	182	r = -ENOMEM;
	183	goto finish;
	184	}
	185
	186	if (!dbus_message_append_args(m,
	187	DBUS_TYPE_STRING, &interface,
	188	DBUS_TYPE_STRING, &property,
	189	DBUS_TYPE_INVALID)) {
	190	log_error("Could not append arguments to message.");
	191	r = -ENOMEM;
	192	goto finish;
	193	}
	194
	195	dbus_message_unref(reply);
	196	if (!(reply = dbus_connection_send_with_reply_and_block(c->bus, m, -1, &error))) {
4cf5d675	197	log_error("Failed to send command: %s", bus_error_message(&error));
4927fcae LP	198	r = -EIO;
	199	goto finish;
	200	}
	201
	202	if (!dbus_message_iter_init(reply, &iter) \|\|
	203	dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_VARIANT) {
	204	log_error("Failed to parse reply.");
	205	r = -EIO;
	206	goto finish;
	207	}
	208
	209	dbus_message_iter_recurse(&iter, &sub);
	210
	211	if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRING) {
	212	log_error("Failed to parse reply.");
	213	r = -EIO;
	214	goto finish;
	215	}
	216
	217	dbus_message_iter_get_basic(&sub, &state);
	218
	219	if (streq(state, "active") \|\| streq(state, "reloading"))
	220	r = table[i].runlevel;
	221
	222	dbus_message_unref(m);
	223	dbus_message_unref(reply);
	224	m = reply = NULL;
	225
	226	if (r)
	227	break;
	228	}
	229
	230	finish:
	231	if (m)
	232	dbus_message_unref(m);
	233
	234	if (reply)
	235	dbus_message_unref(reply);
	236
	237	dbus_error_free(&error);
	238
	239	return r;
	240	}
	241
	242	static int on_reboot(Context *c) {
	243	int r = 0, q;
	244	usec_t t;
	245
	246	assert(c);
	247
	248	/* We finished start-up, so let's write the utmp
	249	* record and send the audit msg */
	250
	251	#ifdef HAVE_AUDIT
	252	if (c->audit_fd >= 0)
830f6caa	253	if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0) {
4927fcae LP	254	log_error("Failed to send audit message: %m");
	255	r = -errno;
	256	}
	257	#endif
	258
	259	/* If this call fails it will return 0, which
	260	* utmp_put_reboot() will then fix to the current time */
	261	t = get_startup_time(c);
	262
	263	if ((q = utmp_put_reboot(t)) < 0) {
	264	log_error("Failed to write utmp record: %s", strerror(-q));
	265	r = q;
	266	}
	267
	268	return r;
	269	}
	270
	271	static int on_shutdown(Context *c) {
	272	int r = 0, q;
	273
	274	assert(c);
	275
	276	/* We started shut-down, so let's write the utmp
	277	* record and send the audit msg */
	278
	279	#ifdef HAVE_AUDIT
	280	if (c->audit_fd >= 0)
830f6caa	281	if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "init", NULL, NULL, NULL, 1) < 0) {
4927fcae LP	282	log_error("Failed to send audit message: %m");
	283	r = -errno;
	284	}
	285	#endif
	286
0ad26e09	287	if ((q = utmp_put_shutdown()) < 0) {
4927fcae LP	288	log_error("Failed to write utmp record: %s", strerror(-q));
	289	r = q;
	290	}
	291
	292	return r;
	293	}
	294
	295	static int on_runlevel(Context *c) {
	296	int r = 0, q, previous, runlevel;
	297
	298	assert(c);
	299
	300	/* We finished changing runlevel, so let's write the
	301	* utmp record and send the audit msg */
	302
	303	/* First, get last runlevel */
	304	if ((q = utmp_get_runlevel(&previous, NULL)) < 0) {
	305
	306	if (q != -ESRCH && q != -ENOENT) {
	307	log_error("Failed to get current runlevel: %s", strerror(-q));
	308	return q;
	309	}
	310
	311	/* Hmm, we didn't find any runlevel, that means we
	312	* have been rebooted */
	313	r = on_reboot(c);
	314	previous = 0;
	315	}
	316
830f6caa	317	/* Secondly, get new runlevel */
4927fcae LP	318	if ((runlevel = get_current_runlevel(c)) < 0)
	319	return runlevel;
	320
	321	if (previous == runlevel)
	322	return 0;
	323
	324	#ifdef HAVE_AUDIT
	325	if (c->audit_fd >= 0) {
	326	char *s = NULL;
	327
cd6d0a45 LP	328	if (asprintf(&s, "old-level=%c new-level=%c",
	329	previous > 0 ? previous : 'N',
	330	runlevel > 0 ? runlevel : 'N') < 0)
4927fcae LP	331	return -ENOMEM;
	332
	333	if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0) {
	334	log_error("Failed to send audit message: %m");
	335	r = -errno;
	336	}
	337
	338	free(s);
	339	}
	340	#endif
	341
0ad26e09	342	if ((q = utmp_put_runlevel(runlevel, previous)) < 0) {
4927fcae LP	343	log_error("Failed to write utmp record: %s", strerror(-q));
	344	r = q;
	345	}
	346
	347	return r;
	348	}
	349
	350	int main(int argc, char *argv[]) {
	351	int r;
	352	DBusError error;
	353	Context c;
	354
	355	dbus_error_init(&error);
	356
	357	zero(c);
	358	#ifdef HAVE_AUDIT
	359	c.audit_fd = -1;
	360	#endif
	361
cd6d0a45 LP	362	if (getppid() != 1) {
cd6d0a45 LP	363	log_error("This program should be invoked by init only.");
22f4096c	364	return EXIT_FAILURE;
cd6d0a45	365	}
4927fcae LP	366
	367	if (argc != 2) {
	368	log_error("This program requires one argument.");
22f4096c	369	return EXIT_FAILURE;
4927fcae LP	370	}
4927fcae LP	371
4cfa2c99	372	log_set_target(LOG_TARGET_AUTO);
4927fcae	373	log_parse_environment();
2396fb04	374	log_open();
4927fcae	375
4c12626c LP	376	umask(0022);
4c12626c LP	377
4927fcae	378	#ifdef HAVE_AUDIT
5a8d081c JN	379	if ((c.audit_fd = audit_open()) < 0 &&
	380	/* If the kernel lacks netlink or audit support,
	381	* don't worry about it. */
	382	errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT)
4927fcae LP	383	log_error("Failed to connect to audit log: %m");
	384	#endif
	385
	386	if (bus_connect(DBUS_BUS_SYSTEM, &c.bus, NULL, &error) < 0) {
4cf5d675	387	log_error("Failed to get D-Bus connection: %s", bus_error_message(&error));
4927fcae LP	388	r = -EIO;
	389	goto finish;
	390	}
	391
cd6d0a45	392	log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid());
4927fcae LP	393
	394	if (streq(argv[1], "reboot"))
	395	r = on_reboot(&c);
	396	else if (streq(argv[1], "shutdown"))
	397	r = on_shutdown(&c);
	398	else if (streq(argv[1], "runlevel"))
	399	r = on_runlevel(&c);
	400	else {
	401	log_error("Unknown command %s", argv[1]);
	402	r = -EINVAL;
	403	}
	404
cd6d0a45	405	log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid());
4927fcae	406
cd6d0a45	407	finish:
4927fcae LP	408	#ifdef HAVE_AUDIT
	409	if (c.audit_fd >= 0)
	410	audit_close(c.audit_fd);
	411	#endif
	412
	413	if (c.bus) {
5d452f9c LP	414	dbus_connection_flush(c.bus);
	415	dbus_connection_close(c.bus);
	416	dbus_connection_unref(c.bus);
4927fcae LP	417	}
	418
	419	dbus_error_free(&error);
	420	dbus_shutdown();
	421
22f4096c	422	return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
4927fcae	423	}