1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#if HAVE_AUDIT
#include <libaudit.h>
#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 "random-util.h"
#include "special.h"
#include "stdio-util.h"
#include "strv.h"
#include "unit-name.h"
#include "util.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 = -1;
#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 },
};
int r;
assert(c);
for (unsigned n_attempts = 0;;) {
for (size_t i = 0; i < ELEMENTSOF(table) - 1; i++) {
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
_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 == -ENOTCONN ||
sd_bus_error_has_names(&error,
SD_BUS_ERROR_NO_REPLY,
SD_BUS_ERROR_DISCONNECTED)) &&
++n_attempts < 64) {
/* systemd might have dropped off momentarily, let's not make this an error,
* and wait some random time. Let's pick a random time in the range 0ms…250ms,
* linearly scaled by the number of failed attempts. */
usec_t usec = random_u64_range(UINT64_C(10) * USEC_PER_MSEC +
UINT64_C(240) * USEC_PER_MSEC * n_attempts/64);
log_debug_errno(r, "Failed to get state of %s, retrying after %s: %s",
table[i].special, FORMAT_TIMESPAN(usec, USEC_PER_MSEC), bus_error_message(&error, r));
(void) usleep(usec);
goto reconnect;
}
if (r < 0)
return log_warning_errno(r, "Failed to get state of %s: %s", table[i].special, bus_error_message(&error, r));
if (STR_IN_SET(state, "active", "reloading"))
return table[i].runlevel;
}
return 0;
reconnect:
c->bus = sd_bus_flush_close_unref(c->bus);
r = bus_connect_system_systemd(&c->bus);
if (r < 0)
return log_error_errno(r, "Failed to reconnect to system bus: %m");
}
}
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 = -1,
#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_WARNING,
errno, "Failed to connect to audit log, ignoring: %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);
|
