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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 | |
5430f7f2 LP |
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 | |
4927fcae LP |
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 | |
5430f7f2 | 16 | Lesser General Public License for more details. |
4927fcae | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
4927fcae LP |
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 | ||
830f6caa LP |
28 | #ifdef HAVE_AUDIT |
29 | #include <libaudit.h> | |
30 | #endif | |
31 | ||
89456fce TG |
32 | #include "sd-bus.h" |
33 | ||
4927fcae LP |
34 | #include "log.h" |
35 | #include "macro.h" | |
36 | #include "util.h" | |
37 | #include "special.h" | |
38 | #include "utmp-wtmp.h" | |
89456fce TG |
39 | #include "bus-util.h" |
40 | #include "bus-error.h" | |
4927fcae LP |
41 | |
42 | typedef struct Context { | |
89456fce | 43 | sd_bus *bus; |
4927fcae LP |
44 | #ifdef HAVE_AUDIT |
45 | int audit_fd; | |
46 | #endif | |
47 | } Context; | |
48 | ||
49 | static usec_t get_startup_time(Context *c) { | |
4927fcae | 50 | usec_t t = 0; |
89456fce TG |
51 | _cleanup_bus_message_unref_ sd_bus_message *reply = NULL; |
52 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
53 | int r; | |
4927fcae | 54 | |
4927fcae LP |
55 | assert(c); |
56 | ||
89456fce | 57 | r = sd_bus_call_method( |
436ddded SP |
58 | c->bus, |
59 | "org.freedesktop.systemd1", | |
60 | "/org/freedesktop/systemd1", | |
61 | "org.freedesktop.DBus.Properties", | |
62 | "Get", | |
89456fce | 63 | &error, |
436ddded | 64 | &reply, |
89456fce TG |
65 | "ss", |
66 | "org.freedesktop.systemd1.Manager", | |
67 | "UserspaceTimestamp"); | |
68 | if (r < 0) { | |
69 | log_error("Failed to get timestamp: %s", bus_error_message(&error, -r)); | |
70 | return t; | |
4927fcae LP |
71 | } |
72 | ||
89456fce | 73 | r = sd_bus_message_read(reply, "v", "t", &t); |
5b30bef8 LP |
74 | if (r < 0) |
75 | return bus_log_parse_error(r); | |
4927fcae | 76 | |
4927fcae LP |
77 | return t; |
78 | } | |
79 | ||
80 | static int get_current_runlevel(Context *c) { | |
81 | static const struct { | |
82 | const int runlevel; | |
83 | const char *special; | |
84 | } table[] = { | |
85 | /* The first target of this list that is active or has | |
ee2083d5 LP |
86 | * a job scheduled wins. We prefer runlevels 5 and 3 |
87 | * here over the others, since these are the main | |
88 | * runlevels used on Fedora. It might make sense to | |
89 | * change the order on some distributions. */ | |
4927fcae | 90 | { '5', SPECIAL_RUNLEVEL5_TARGET }, |
4927fcae | 91 | { '3', SPECIAL_RUNLEVEL3_TARGET }, |
3006982d | 92 | { '4', SPECIAL_RUNLEVEL4_TARGET }, |
4927fcae | 93 | { '2', SPECIAL_RUNLEVEL2_TARGET }, |
3f92e4b4 | 94 | { '1', SPECIAL_RESCUE_TARGET }, |
4927fcae | 95 | }; |
4927fcae | 96 | |
89456fce TG |
97 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
98 | int r; | |
4927fcae | 99 | unsigned i; |
4927fcae LP |
100 | |
101 | assert(c); | |
102 | ||
4927fcae | 103 | for (i = 0; i < ELEMENTSOF(table); i++) { |
89456fce | 104 | _cleanup_bus_message_unref_ sd_bus_message *reply1 = NULL, *reply2 = NULL; |
4927fcae | 105 | const char *path = NULL, *state; |
4927fcae | 106 | |
89456fce | 107 | r = sd_bus_call_method( |
436ddded SP |
108 | c->bus, |
109 | "org.freedesktop.systemd1", | |
110 | "/org/freedesktop/systemd1", | |
111 | "org.freedesktop.systemd1.Manager", | |
89456fce TG |
112 | "LoadUnit", |
113 | &error, | |
114 | &reply1, | |
115 | "s", table[i].special); | |
116 | if (r < 0) { | |
117 | log_error("Failed to get runlevel: %s", bus_error_message(&error, -r)); | |
118 | if (r == -ENOMEM) | |
119 | return r; | |
120 | else | |
121 | continue; | |
4927fcae LP |
122 | } |
123 | ||
89456fce | 124 | r = sd_bus_message_read(reply1, "o", &path); |
5b30bef8 LP |
125 | if (r < 0) |
126 | return bus_log_parse_error(r); | |
89456fce TG |
127 | |
128 | r = sd_bus_call_method( | |
436ddded SP |
129 | c->bus, |
130 | "org.freedesktop.systemd1", | |
131 | path, | |
132 | "org.freedesktop.DBus.Properties", | |
133 | "Get", | |
89456fce TG |
134 | &error, |
135 | &reply2, | |
136 | "ss", "org.freedesktop.systemd1.Unit", "ActiveState"); | |
137 | if (r < 0) { | |
138 | log_error("Failed to get state: %s", bus_error_message(&error, -r)); | |
139 | return r; | |
4927fcae LP |
140 | } |
141 | ||
89456fce | 142 | r = sd_bus_message_read(reply2, "v", "s", &state); |
5b30bef8 LP |
143 | if (r < 0) |
144 | return bus_log_parse_error(r); | |
4927fcae | 145 | |
4927fcae | 146 | if (streq(state, "active") || streq(state, "reloading")) |
89456fce | 147 | return table[i].runlevel; |
4927fcae LP |
148 | } |
149 | ||
89456fce | 150 | return 0; |
4927fcae LP |
151 | } |
152 | ||
153 | static int on_reboot(Context *c) { | |
154 | int r = 0, q; | |
155 | usec_t t; | |
156 | ||
157 | assert(c); | |
158 | ||
159 | /* We finished start-up, so let's write the utmp | |
160 | * record and send the audit msg */ | |
161 | ||
162 | #ifdef HAVE_AUDIT | |
163 | if (c->audit_fd >= 0) | |
44785992 LP |
164 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0 && |
165 | errno != EPERM) { | |
4927fcae LP |
166 | log_error("Failed to send audit message: %m"); |
167 | r = -errno; | |
168 | } | |
169 | #endif | |
170 | ||
171 | /* If this call fails it will return 0, which | |
172 | * utmp_put_reboot() will then fix to the current time */ | |
173 | t = get_startup_time(c); | |
174 | ||
175 | if ((q = utmp_put_reboot(t)) < 0) { | |
176 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
177 | r = q; | |
178 | } | |
179 | ||
180 | return r; | |
181 | } | |
182 | ||
183 | static int on_shutdown(Context *c) { | |
184 | int r = 0, q; | |
185 | ||
186 | assert(c); | |
187 | ||
188 | /* We started shut-down, so let's write the utmp | |
189 | * record and send the audit msg */ | |
190 | ||
191 | #ifdef HAVE_AUDIT | |
192 | if (c->audit_fd >= 0) | |
44785992 LP |
193 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "init", NULL, NULL, NULL, 1) < 0 && |
194 | errno != EPERM) { | |
4927fcae LP |
195 | log_error("Failed to send audit message: %m"); |
196 | r = -errno; | |
197 | } | |
198 | #endif | |
199 | ||
0ad26e09 | 200 | if ((q = utmp_put_shutdown()) < 0) { |
4927fcae LP |
201 | log_error("Failed to write utmp record: %s", strerror(-q)); |
202 | r = q; | |
203 | } | |
204 | ||
205 | return r; | |
206 | } | |
207 | ||
208 | static int on_runlevel(Context *c) { | |
209 | int r = 0, q, previous, runlevel; | |
210 | ||
211 | assert(c); | |
212 | ||
213 | /* We finished changing runlevel, so let's write the | |
214 | * utmp record and send the audit msg */ | |
215 | ||
216 | /* First, get last runlevel */ | |
217 | if ((q = utmp_get_runlevel(&previous, NULL)) < 0) { | |
218 | ||
219 | if (q != -ESRCH && q != -ENOENT) { | |
220 | log_error("Failed to get current runlevel: %s", strerror(-q)); | |
221 | return q; | |
222 | } | |
223 | ||
224 | /* Hmm, we didn't find any runlevel, that means we | |
225 | * have been rebooted */ | |
226 | r = on_reboot(c); | |
227 | previous = 0; | |
228 | } | |
229 | ||
830f6caa | 230 | /* Secondly, get new runlevel */ |
4927fcae LP |
231 | if ((runlevel = get_current_runlevel(c)) < 0) |
232 | return runlevel; | |
233 | ||
234 | if (previous == runlevel) | |
235 | return 0; | |
236 | ||
237 | #ifdef HAVE_AUDIT | |
238 | if (c->audit_fd >= 0) { | |
239 | char *s = NULL; | |
240 | ||
cd6d0a45 LP |
241 | if (asprintf(&s, "old-level=%c new-level=%c", |
242 | previous > 0 ? previous : 'N', | |
243 | runlevel > 0 ? runlevel : 'N') < 0) | |
4927fcae LP |
244 | return -ENOMEM; |
245 | ||
44785992 LP |
246 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0 && |
247 | errno != EPERM) { | |
4927fcae LP |
248 | log_error("Failed to send audit message: %m"); |
249 | r = -errno; | |
250 | } | |
251 | ||
252 | free(s); | |
253 | } | |
254 | #endif | |
255 | ||
0ad26e09 | 256 | if ((q = utmp_put_runlevel(runlevel, previous)) < 0) { |
55f2dca3 CW |
257 | if (q != -ESRCH && q != -ENOENT) { |
258 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
259 | r = q; | |
260 | } | |
4927fcae LP |
261 | } |
262 | ||
263 | return r; | |
264 | } | |
265 | ||
266 | int main(int argc, char *argv[]) { | |
267 | int r; | |
b92bea5d | 268 | Context c = {}; |
4927fcae | 269 | |
4927fcae LP |
270 | #ifdef HAVE_AUDIT |
271 | c.audit_fd = -1; | |
272 | #endif | |
273 | ||
cd6d0a45 LP |
274 | if (getppid() != 1) { |
275 | log_error("This program should be invoked by init only."); | |
22f4096c | 276 | return EXIT_FAILURE; |
cd6d0a45 | 277 | } |
4927fcae LP |
278 | |
279 | if (argc != 2) { | |
280 | log_error("This program requires one argument."); | |
22f4096c | 281 | return EXIT_FAILURE; |
4927fcae LP |
282 | } |
283 | ||
4cfa2c99 | 284 | log_set_target(LOG_TARGET_AUTO); |
4927fcae | 285 | log_parse_environment(); |
2396fb04 | 286 | log_open(); |
4927fcae | 287 | |
4c12626c LP |
288 | umask(0022); |
289 | ||
4927fcae | 290 | #ifdef HAVE_AUDIT |
5a8d081c JN |
291 | if ((c.audit_fd = audit_open()) < 0 && |
292 | /* If the kernel lacks netlink or audit support, | |
293 | * don't worry about it. */ | |
294 | errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) | |
4927fcae LP |
295 | log_error("Failed to connect to audit log: %m"); |
296 | #endif | |
0f8bd8de | 297 | r = bus_open_system_systemd(&c.bus); |
89456fce TG |
298 | if (r < 0) { |
299 | log_error("Failed to get D-Bus connection: %s", strerror(-r)); | |
4927fcae LP |
300 | r = -EIO; |
301 | goto finish; | |
302 | } | |
303 | ||
cd6d0a45 | 304 | log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid()); |
4927fcae LP |
305 | |
306 | if (streq(argv[1], "reboot")) | |
307 | r = on_reboot(&c); | |
308 | else if (streq(argv[1], "shutdown")) | |
309 | r = on_shutdown(&c); | |
310 | else if (streq(argv[1], "runlevel")) | |
311 | r = on_runlevel(&c); | |
312 | else { | |
313 | log_error("Unknown command %s", argv[1]); | |
314 | r = -EINVAL; | |
315 | } | |
316 | ||
cd6d0a45 | 317 | log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid()); |
4927fcae | 318 | |
cd6d0a45 | 319 | finish: |
4927fcae LP |
320 | #ifdef HAVE_AUDIT |
321 | if (c.audit_fd >= 0) | |
322 | audit_close(c.audit_fd); | |
323 | #endif | |
324 | ||
89456fce TG |
325 | if (c.bus) |
326 | sd_bus_unref(c.bus); | |
4927fcae | 327 | |
22f4096c | 328 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
4927fcae | 329 | } |