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1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ | |
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 Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 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 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser 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> | |
25 | #include <sys/types.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #ifdef HAVE_AUDIT | |
29 | #include <libaudit.h> | |
30 | #endif | |
31 | ||
32 | #include "sd-bus.h" | |
33 | ||
34 | #include "log.h" | |
35 | #include "macro.h" | |
36 | #include "util.h" | |
37 | #include "special.h" | |
38 | #include "utmp-wtmp.h" | |
39 | #include "bus-util.h" | |
40 | #include "bus-error.h" | |
41 | ||
42 | typedef struct Context { | |
43 | sd_bus *bus; | |
44 | #ifdef HAVE_AUDIT | |
45 | int audit_fd; | |
46 | #endif | |
47 | } Context; | |
48 | ||
49 | static usec_t get_startup_time(Context *c) { | |
50 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
51 | usec_t t = 0; | |
52 | int r; | |
53 | ||
54 | assert(c); | |
55 | ||
56 | r = sd_bus_get_property_trivial( | |
57 | c->bus, | |
58 | "org.freedesktop.systemd1", | |
59 | "/org/freedesktop/systemd1", | |
60 | "org.freedesktop.systemd1.Manager", | |
61 | "UserspaceTimestamp", | |
62 | &error, | |
63 | 't', &t); | |
64 | if (r < 0) { | |
65 | log_error("Failed to get timestamp: %s", bus_error_message(&error, -r)); | |
66 | return 0; | |
67 | } | |
68 | ||
69 | return t; | |
70 | } | |
71 | ||
72 | static int get_current_runlevel(Context *c) { | |
73 | static const struct { | |
74 | const int runlevel; | |
75 | const char *special; | |
76 | } table[] = { | |
77 | /* The first target of this list that is active or has | |
78 | * a job scheduled wins. We prefer runlevels 5 and 3 | |
79 | * here over the others, since these are the main | |
80 | * runlevels used on Fedora. It might make sense to | |
81 | * change the order on some distributions. */ | |
82 | { '5', SPECIAL_RUNLEVEL5_TARGET }, | |
83 | { '3', SPECIAL_RUNLEVEL3_TARGET }, | |
84 | { '4', SPECIAL_RUNLEVEL4_TARGET }, | |
85 | { '2', SPECIAL_RUNLEVEL2_TARGET }, | |
86 | { '1', SPECIAL_RESCUE_TARGET }, | |
87 | }; | |
88 | ||
89 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
90 | int r; | |
91 | unsigned i; | |
92 | ||
93 | assert(c); | |
94 | ||
95 | for (i = 0; i < ELEMENTSOF(table); i++) { | |
96 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; | |
97 | _cleanup_free_ char *state = NULL; | |
98 | const char *path = NULL; | |
99 | ||
100 | r = sd_bus_call_method( | |
101 | c->bus, | |
102 | "org.freedesktop.systemd1", | |
103 | "/org/freedesktop/systemd1", | |
104 | "org.freedesktop.systemd1.Manager", | |
105 | "LoadUnit", | |
106 | &error, | |
107 | &reply, | |
108 | "s", table[i].special); | |
109 | if (r < 0) { | |
110 | log_warning("Failed to get runlevel: %s", bus_error_message(&error, -r)); | |
111 | continue; | |
112 | } | |
113 | ||
114 | r = sd_bus_message_read(reply, "o", &path); | |
115 | if (r < 0) | |
116 | return bus_log_parse_error(r); | |
117 | ||
118 | r = sd_bus_get_property_string( | |
119 | c->bus, | |
120 | "org.freedesktop.systemd1", | |
121 | path, | |
122 | "org.freedesktop.systemd1.Unit", | |
123 | "ActiveState", | |
124 | &error, | |
125 | &state); | |
126 | if (r < 0) { | |
127 | log_warning("Failed to get state: %s", bus_error_message(&error, -r)); | |
128 | return r; | |
129 | } | |
130 | ||
131 | if (streq(state, "active") || streq(state, "reloading")) | |
132 | return table[i].runlevel; | |
133 | } | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static int on_reboot(Context *c) { | |
139 | int r = 0, q; | |
140 | usec_t t; | |
141 | ||
142 | assert(c); | |
143 | ||
144 | /* We finished start-up, so let's write the utmp | |
145 | * record and send the audit msg */ | |
146 | ||
147 | #ifdef HAVE_AUDIT | |
148 | if (c->audit_fd >= 0) | |
149 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0 && | |
150 | errno != EPERM) { | |
151 | log_error("Failed to send audit message: %m"); | |
152 | r = -errno; | |
153 | } | |
154 | #endif | |
155 | ||
156 | /* If this call fails it will return 0, which | |
157 | * utmp_put_reboot() will then fix to the current time */ | |
158 | t = get_startup_time(c); | |
159 | ||
160 | q = utmp_put_reboot(t); | |
161 | if (q < 0) { | |
162 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
163 | r = q; | |
164 | } | |
165 | ||
166 | return r; | |
167 | } | |
168 | ||
169 | static int on_shutdown(Context *c) { | |
170 | int r = 0, q; | |
171 | ||
172 | assert(c); | |
173 | ||
174 | /* We started shut-down, so let's write the utmp | |
175 | * record and send the audit msg */ | |
176 | ||
177 | #ifdef HAVE_AUDIT | |
178 | if (c->audit_fd >= 0) | |
179 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "init", NULL, NULL, NULL, 1) < 0 && | |
180 | errno != EPERM) { | |
181 | log_error("Failed to send audit message: %m"); | |
182 | r = -errno; | |
183 | } | |
184 | #endif | |
185 | ||
186 | q = utmp_put_shutdown(); | |
187 | if (q < 0) { | |
188 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
189 | r = q; | |
190 | } | |
191 | ||
192 | return r; | |
193 | } | |
194 | ||
195 | static int on_runlevel(Context *c) { | |
196 | int r = 0, q, previous, runlevel; | |
197 | ||
198 | assert(c); | |
199 | ||
200 | /* We finished changing runlevel, so let's write the | |
201 | * utmp record and send the audit msg */ | |
202 | ||
203 | /* First, get last runlevel */ | |
204 | q = utmp_get_runlevel(&previous, NULL); | |
205 | if (q < 0) { | |
206 | ||
207 | if (q != -ESRCH && q != -ENOENT) { | |
208 | log_error("Failed to get current runlevel: %s", strerror(-q)); | |
209 | return q; | |
210 | } | |
211 | ||
212 | /* Hmm, we didn't find any runlevel, that means we | |
213 | * have been rebooted */ | |
214 | r = on_reboot(c); | |
215 | previous = 0; | |
216 | } | |
217 | ||
218 | /* Secondly, get new runlevel */ | |
219 | runlevel = get_current_runlevel(c); | |
220 | if (runlevel < 0) | |
221 | return runlevel; | |
222 | ||
223 | if (previous == runlevel) | |
224 | return 0; | |
225 | ||
226 | #ifdef HAVE_AUDIT | |
227 | if (c->audit_fd >= 0) { | |
228 | _cleanup_free_ char *s = NULL; | |
229 | ||
230 | if (asprintf(&s, "old-level=%c new-level=%c", | |
231 | previous > 0 ? previous : 'N', | |
232 | runlevel > 0 ? runlevel : 'N') < 0) | |
233 | return log_oom(); | |
234 | ||
235 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0 && | |
236 | errno != EPERM) { | |
237 | log_error("Failed to send audit message: %m"); | |
238 | r = -errno; | |
239 | } | |
240 | } | |
241 | #endif | |
242 | ||
243 | q = utmp_put_runlevel(runlevel, previous); | |
244 | if (q < 0 && q != -ESRCH && q != -ENOENT) { | |
245 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
246 | r = q; | |
247 | } | |
248 | ||
249 | return r; | |
250 | } | |
251 | ||
252 | int main(int argc, char *argv[]) { | |
253 | Context c = { | |
254 | #ifdef HAVE_AUDIT | |
255 | .audit_fd = -1 | |
256 | #endif | |
257 | }; | |
258 | int r; | |
259 | ||
260 | if (getppid() != 1) { | |
261 | log_error("This program should be invoked by init only."); | |
262 | return EXIT_FAILURE; | |
263 | } | |
264 | ||
265 | if (argc != 2) { | |
266 | log_error("This program requires one argument."); | |
267 | return EXIT_FAILURE; | |
268 | } | |
269 | ||
270 | log_set_target(LOG_TARGET_AUTO); | |
271 | log_parse_environment(); | |
272 | log_open(); | |
273 | ||
274 | umask(0022); | |
275 | ||
276 | #ifdef HAVE_AUDIT | |
277 | /* If the kernel lacks netlink or audit support, | |
278 | * don't worry about it. */ | |
279 | c.audit_fd = audit_open(); | |
280 | if (c.audit_fd < 0 && errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) | |
281 | log_error("Failed to connect to audit log: %m"); | |
282 | #endif | |
283 | r = bus_open_system_systemd(&c.bus); | |
284 | if (r < 0) { | |
285 | log_error("Failed to get D-Bus connection: %s", strerror(-r)); | |
286 | r = -EIO; | |
287 | goto finish; | |
288 | } | |
289 | ||
290 | log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid()); | |
291 | ||
292 | if (streq(argv[1], "reboot")) | |
293 | r = on_reboot(&c); | |
294 | else if (streq(argv[1], "shutdown")) | |
295 | r = on_shutdown(&c); | |
296 | else if (streq(argv[1], "runlevel")) | |
297 | r = on_runlevel(&c); | |
298 | else { | |
299 | log_error("Unknown command %s", argv[1]); | |
300 | r = -EINVAL; | |
301 | } | |
302 | ||
303 | log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid()); | |
304 | ||
305 | finish: | |
306 | #ifdef HAVE_AUDIT | |
307 | if (c.audit_fd >= 0) | |
308 | audit_close(c.audit_fd); | |
309 | #endif | |
310 | ||
311 | if (c.bus) | |
312 | sd_bus_unref(c.bus); | |
313 | ||
314 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
315 | } |