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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" | |
e7fb33ff | 41 | #include "unit-name.h" |
4927fcae LP |
42 | |
43 | typedef struct Context { | |
89456fce | 44 | sd_bus *bus; |
4927fcae LP |
45 | #ifdef HAVE_AUDIT |
46 | int audit_fd; | |
47 | #endif | |
48 | } Context; | |
49 | ||
50 | static usec_t get_startup_time(Context *c) { | |
89456fce | 51 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
47c649b5 | 52 | usec_t t = 0; |
89456fce | 53 | int r; |
4927fcae | 54 | |
4927fcae LP |
55 | assert(c); |
56 | ||
47c649b5 | 57 | r = sd_bus_get_property_trivial( |
436ddded SP |
58 | c->bus, |
59 | "org.freedesktop.systemd1", | |
60 | "/org/freedesktop/systemd1", | |
89456fce | 61 | "org.freedesktop.systemd1.Manager", |
47c649b5 LP |
62 | "UserspaceTimestamp", |
63 | &error, | |
64 | 't', &t); | |
89456fce TG |
65 | if (r < 0) { |
66 | log_error("Failed to get timestamp: %s", bus_error_message(&error, -r)); | |
47c649b5 | 67 | return 0; |
4927fcae LP |
68 | } |
69 | ||
4927fcae LP |
70 | return t; |
71 | } | |
72 | ||
73 | static int get_current_runlevel(Context *c) { | |
74 | static const struct { | |
75 | const int runlevel; | |
76 | const char *special; | |
77 | } table[] = { | |
78 | /* The first target of this list that is active or has | |
ee2083d5 LP |
79 | * a job scheduled wins. We prefer runlevels 5 and 3 |
80 | * here over the others, since these are the main | |
81 | * runlevels used on Fedora. It might make sense to | |
82 | * change the order on some distributions. */ | |
4927fcae | 83 | { '5', SPECIAL_RUNLEVEL5_TARGET }, |
4927fcae | 84 | { '3', SPECIAL_RUNLEVEL3_TARGET }, |
3006982d | 85 | { '4', SPECIAL_RUNLEVEL4_TARGET }, |
4927fcae | 86 | { '2', SPECIAL_RUNLEVEL2_TARGET }, |
3f92e4b4 | 87 | { '1', SPECIAL_RESCUE_TARGET }, |
4927fcae | 88 | }; |
4927fcae | 89 | |
89456fce TG |
90 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; |
91 | int r; | |
4927fcae | 92 | unsigned i; |
4927fcae LP |
93 | |
94 | assert(c); | |
95 | ||
4927fcae | 96 | for (i = 0; i < ELEMENTSOF(table); i++) { |
e7fb33ff | 97 | _cleanup_free_ char *state = NULL, *path = NULL; |
4927fcae | 98 | |
e7fb33ff LP |
99 | path = unit_dbus_path_from_name(table[i].special); |
100 | if (!path) | |
101 | return log_oom(); | |
89456fce | 102 | |
47c649b5 | 103 | r = sd_bus_get_property_string( |
436ddded SP |
104 | c->bus, |
105 | "org.freedesktop.systemd1", | |
106 | path, | |
47c649b5 LP |
107 | "org.freedesktop.systemd1.Unit", |
108 | "ActiveState", | |
89456fce | 109 | &error, |
47c649b5 | 110 | &state); |
89456fce | 111 | if (r < 0) { |
47c649b5 | 112 | log_warning("Failed to get state: %s", bus_error_message(&error, -r)); |
89456fce | 113 | return r; |
4927fcae LP |
114 | } |
115 | ||
4927fcae | 116 | if (streq(state, "active") || streq(state, "reloading")) |
89456fce | 117 | return table[i].runlevel; |
4927fcae LP |
118 | } |
119 | ||
89456fce | 120 | return 0; |
4927fcae LP |
121 | } |
122 | ||
123 | static int on_reboot(Context *c) { | |
124 | int r = 0, q; | |
125 | usec_t t; | |
126 | ||
127 | assert(c); | |
128 | ||
129 | /* We finished start-up, so let's write the utmp | |
130 | * record and send the audit msg */ | |
131 | ||
132 | #ifdef HAVE_AUDIT | |
133 | if (c->audit_fd >= 0) | |
44785992 LP |
134 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "init", NULL, NULL, NULL, 1) < 0 && |
135 | errno != EPERM) { | |
4927fcae LP |
136 | log_error("Failed to send audit message: %m"); |
137 | r = -errno; | |
138 | } | |
139 | #endif | |
140 | ||
141 | /* If this call fails it will return 0, which | |
142 | * utmp_put_reboot() will then fix to the current time */ | |
143 | t = get_startup_time(c); | |
144 | ||
1cea22a5 LP |
145 | q = utmp_put_reboot(t); |
146 | if (q < 0) { | |
4927fcae LP |
147 | log_error("Failed to write utmp record: %s", strerror(-q)); |
148 | r = q; | |
149 | } | |
150 | ||
151 | return r; | |
152 | } | |
153 | ||
154 | static int on_shutdown(Context *c) { | |
155 | int r = 0, q; | |
156 | ||
157 | assert(c); | |
158 | ||
159 | /* We started shut-down, 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_SHUTDOWN, "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 | ||
1cea22a5 LP |
171 | q = utmp_put_shutdown(); |
172 | if (q < 0) { | |
4927fcae LP |
173 | log_error("Failed to write utmp record: %s", strerror(-q)); |
174 | r = q; | |
175 | } | |
176 | ||
177 | return r; | |
178 | } | |
179 | ||
180 | static int on_runlevel(Context *c) { | |
181 | int r = 0, q, previous, runlevel; | |
182 | ||
183 | assert(c); | |
184 | ||
185 | /* We finished changing runlevel, so let's write the | |
186 | * utmp record and send the audit msg */ | |
187 | ||
188 | /* First, get last runlevel */ | |
1cea22a5 | 189 | q = utmp_get_runlevel(&previous, NULL); |
4927fcae | 190 | |
e7fb33ff | 191 | if (q < 0) { |
4927fcae LP |
192 | if (q != -ESRCH && q != -ENOENT) { |
193 | log_error("Failed to get current runlevel: %s", strerror(-q)); | |
194 | return q; | |
195 | } | |
196 | ||
4927fcae LP |
197 | previous = 0; |
198 | } | |
199 | ||
830f6caa | 200 | /* Secondly, get new runlevel */ |
1cea22a5 | 201 | runlevel = get_current_runlevel(c); |
e7fb33ff | 202 | |
1cea22a5 | 203 | if (runlevel < 0) |
4927fcae LP |
204 | return runlevel; |
205 | ||
206 | if (previous == runlevel) | |
207 | return 0; | |
208 | ||
209 | #ifdef HAVE_AUDIT | |
210 | if (c->audit_fd >= 0) { | |
1cea22a5 | 211 | _cleanup_free_ char *s = NULL; |
4927fcae | 212 | |
cd6d0a45 LP |
213 | if (asprintf(&s, "old-level=%c new-level=%c", |
214 | previous > 0 ? previous : 'N', | |
215 | runlevel > 0 ? runlevel : 'N') < 0) | |
1cea22a5 | 216 | return log_oom(); |
4927fcae | 217 | |
44785992 LP |
218 | if (audit_log_user_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, NULL, NULL, NULL, 1) < 0 && |
219 | errno != EPERM) { | |
4927fcae LP |
220 | log_error("Failed to send audit message: %m"); |
221 | r = -errno; | |
222 | } | |
4927fcae LP |
223 | } |
224 | #endif | |
225 | ||
1cea22a5 LP |
226 | q = utmp_put_runlevel(runlevel, previous); |
227 | if (q < 0 && q != -ESRCH && q != -ENOENT) { | |
228 | log_error("Failed to write utmp record: %s", strerror(-q)); | |
229 | r = q; | |
4927fcae LP |
230 | } |
231 | ||
232 | return r; | |
233 | } | |
234 | ||
235 | int main(int argc, char *argv[]) { | |
1cea22a5 | 236 | Context c = { |
4927fcae | 237 | #ifdef HAVE_AUDIT |
1cea22a5 | 238 | .audit_fd = -1 |
4927fcae | 239 | #endif |
1cea22a5 LP |
240 | }; |
241 | int r; | |
4927fcae | 242 | |
cd6d0a45 LP |
243 | if (getppid() != 1) { |
244 | log_error("This program should be invoked by init only."); | |
22f4096c | 245 | return EXIT_FAILURE; |
cd6d0a45 | 246 | } |
4927fcae LP |
247 | |
248 | if (argc != 2) { | |
249 | log_error("This program requires one argument."); | |
22f4096c | 250 | return EXIT_FAILURE; |
4927fcae LP |
251 | } |
252 | ||
4cfa2c99 | 253 | log_set_target(LOG_TARGET_AUTO); |
4927fcae | 254 | log_parse_environment(); |
2396fb04 | 255 | log_open(); |
4927fcae | 256 | |
4c12626c LP |
257 | umask(0022); |
258 | ||
4927fcae | 259 | #ifdef HAVE_AUDIT |
1cea22a5 LP |
260 | /* If the kernel lacks netlink or audit support, |
261 | * don't worry about it. */ | |
262 | c.audit_fd = audit_open(); | |
263 | if (c.audit_fd < 0 && errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) | |
4927fcae LP |
264 | log_error("Failed to connect to audit log: %m"); |
265 | #endif | |
0f8bd8de | 266 | r = bus_open_system_systemd(&c.bus); |
89456fce TG |
267 | if (r < 0) { |
268 | log_error("Failed to get D-Bus connection: %s", strerror(-r)); | |
4927fcae LP |
269 | r = -EIO; |
270 | goto finish; | |
271 | } | |
272 | ||
cd6d0a45 | 273 | log_debug("systemd-update-utmp running as pid %lu", (unsigned long) getpid()); |
4927fcae LP |
274 | |
275 | if (streq(argv[1], "reboot")) | |
276 | r = on_reboot(&c); | |
277 | else if (streq(argv[1], "shutdown")) | |
278 | r = on_shutdown(&c); | |
279 | else if (streq(argv[1], "runlevel")) | |
280 | r = on_runlevel(&c); | |
281 | else { | |
282 | log_error("Unknown command %s", argv[1]); | |
283 | r = -EINVAL; | |
284 | } | |
285 | ||
cd6d0a45 | 286 | log_debug("systemd-update-utmp stopped as pid %lu", (unsigned long) getpid()); |
4927fcae | 287 | |
cd6d0a45 | 288 | finish: |
4927fcae LP |
289 | #ifdef HAVE_AUDIT |
290 | if (c.audit_fd >= 0) | |
291 | audit_close(c.audit_fd); | |
292 | #endif | |
293 | ||
89456fce TG |
294 | if (c.bus) |
295 | sd_bus_unref(c.bus); | |
4927fcae | 296 | |
22f4096c | 297 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
4927fcae | 298 | } |