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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 <errno.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #ifdef HAVE_AUDIT | |
27 | #include <libaudit.h> | |
28 | #endif | |
29 | ||
30 | #include "sd-bus.h" | |
31 | ||
32 | #include "log.h" | |
33 | #include "macro.h" | |
34 | #include "util.h" | |
35 | #include "special.h" | |
36 | #include "utmp-wtmp.h" | |
37 | #include "bus-util.h" | |
38 | #include "bus-error.h" | |
39 | #include "unit-name.h" | |
40 | #include "formats-util.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_GRAPHICAL_TARGET }, | |
83 | { '3', SPECIAL_MULTI_USER_TARGET }, | |
84 | { '1', SPECIAL_RESCUE_TARGET }, | |
85 | }; | |
86 | ||
87 | _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL; | |
88 | int r; | |
89 | unsigned i; | |
90 | ||
91 | assert(c); | |
92 | ||
93 | for (i = 0; i < ELEMENTSOF(table); i++) { | |
94 | _cleanup_free_ char *state = NULL, *path = NULL; | |
95 | ||
96 | path = unit_dbus_path_from_name(table[i].special); | |
97 | if (!path) | |
98 | return log_oom(); | |
99 | ||
100 | r = sd_bus_get_property_string( | |
101 | c->bus, | |
102 | "org.freedesktop.systemd1", | |
103 | path, | |
104 | "org.freedesktop.systemd1.Unit", | |
105 | "ActiveState", | |
106 | &error, | |
107 | &state); | |
108 | if (r < 0) { | |
109 | log_warning("Failed to get state: %s", bus_error_message(&error, -r)); | |
110 | return r; | |
111 | } | |
112 | ||
113 | if (streq(state, "active") || streq(state, "reloading")) | |
114 | return table[i].runlevel; | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
120 | static int on_reboot(Context *c) { | |
121 | int r = 0, q; | |
122 | usec_t t; | |
123 | ||
124 | assert(c); | |
125 | ||
126 | /* We finished start-up, so let's write the utmp | |
127 | * record and send the audit msg */ | |
128 | ||
129 | #ifdef HAVE_AUDIT | |
130 | if (c->audit_fd >= 0) | |
131 | if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_BOOT, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && | |
132 | errno != EPERM) { | |
133 | log_error_errno(errno, "Failed to send audit message: %m"); | |
134 | r = -errno; | |
135 | } | |
136 | #endif | |
137 | ||
138 | /* If this call fails it will return 0, which | |
139 | * utmp_put_reboot() will then fix to the current time */ | |
140 | t = get_startup_time(c); | |
141 | ||
142 | q = utmp_put_reboot(t); | |
143 | if (q < 0) { | |
144 | log_error_errno(q, "Failed to write utmp record: %m"); | |
145 | r = q; | |
146 | } | |
147 | ||
148 | return r; | |
149 | } | |
150 | ||
151 | static int on_shutdown(Context *c) { | |
152 | int r = 0, q; | |
153 | ||
154 | assert(c); | |
155 | ||
156 | /* We started shut-down, so let's write the utmp | |
157 | * record and send the audit msg */ | |
158 | ||
159 | #ifdef HAVE_AUDIT | |
160 | if (c->audit_fd >= 0) | |
161 | if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_SHUTDOWN, "", "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && | |
162 | errno != EPERM) { | |
163 | log_error_errno(errno, "Failed to send audit message: %m"); | |
164 | r = -errno; | |
165 | } | |
166 | #endif | |
167 | ||
168 | q = utmp_put_shutdown(); | |
169 | if (q < 0) { | |
170 | log_error_errno(q, "Failed to write utmp record: %m"); | |
171 | r = q; | |
172 | } | |
173 | ||
174 | return r; | |
175 | } | |
176 | ||
177 | static int on_runlevel(Context *c) { | |
178 | int r = 0, q, previous, runlevel; | |
179 | ||
180 | assert(c); | |
181 | ||
182 | /* We finished changing runlevel, so let's write the | |
183 | * utmp record and send the audit msg */ | |
184 | ||
185 | /* First, get last runlevel */ | |
186 | q = utmp_get_runlevel(&previous, NULL); | |
187 | ||
188 | if (q < 0) { | |
189 | if (q != -ESRCH && q != -ENOENT) | |
190 | return log_error_errno(q, "Failed to get current runlevel: %m"); | |
191 | ||
192 | previous = 0; | |
193 | } | |
194 | ||
195 | /* Secondly, get new runlevel */ | |
196 | runlevel = get_current_runlevel(c); | |
197 | ||
198 | if (runlevel < 0) | |
199 | return runlevel; | |
200 | ||
201 | if (previous == runlevel) | |
202 | return 0; | |
203 | ||
204 | #ifdef HAVE_AUDIT | |
205 | if (c->audit_fd >= 0) { | |
206 | _cleanup_free_ char *s = NULL; | |
207 | ||
208 | if (asprintf(&s, "old-level=%c new-level=%c", | |
209 | previous > 0 ? previous : 'N', | |
210 | runlevel > 0 ? runlevel : 'N') < 0) | |
211 | return log_oom(); | |
212 | ||
213 | if (audit_log_user_comm_message(c->audit_fd, AUDIT_SYSTEM_RUNLEVEL, s, "systemd-update-utmp", NULL, NULL, NULL, 1) < 0 && | |
214 | errno != EPERM) { | |
215 | log_error_errno(errno, "Failed to send audit message: %m"); | |
216 | r = -errno; | |
217 | } | |
218 | } | |
219 | #endif | |
220 | ||
221 | q = utmp_put_runlevel(runlevel, previous); | |
222 | if (q < 0 && q != -ESRCH && q != -ENOENT) { | |
223 | log_error_errno(q, "Failed to write utmp record: %m"); | |
224 | r = q; | |
225 | } | |
226 | ||
227 | return r; | |
228 | } | |
229 | ||
230 | int main(int argc, char *argv[]) { | |
231 | Context c = { | |
232 | #ifdef HAVE_AUDIT | |
233 | .audit_fd = -1 | |
234 | #endif | |
235 | }; | |
236 | int r; | |
237 | ||
238 | if (getppid() != 1) { | |
239 | log_error("This program should be invoked by init only."); | |
240 | return EXIT_FAILURE; | |
241 | } | |
242 | ||
243 | if (argc != 2) { | |
244 | log_error("This program requires one argument."); | |
245 | return EXIT_FAILURE; | |
246 | } | |
247 | ||
248 | log_set_target(LOG_TARGET_AUTO); | |
249 | log_parse_environment(); | |
250 | log_open(); | |
251 | ||
252 | umask(0022); | |
253 | ||
254 | #ifdef HAVE_AUDIT | |
255 | /* If the kernel lacks netlink or audit support, | |
256 | * don't worry about it. */ | |
257 | c.audit_fd = audit_open(); | |
258 | if (c.audit_fd < 0 && errno != EAFNOSUPPORT && errno != EPROTONOSUPPORT) | |
259 | log_error_errno(errno, "Failed to connect to audit log: %m"); | |
260 | #endif | |
261 | r = bus_open_system_systemd(&c.bus); | |
262 | if (r < 0) { | |
263 | log_error_errno(r, "Failed to get D-Bus connection: %m"); | |
264 | r = -EIO; | |
265 | goto finish; | |
266 | } | |
267 | ||
268 | log_debug("systemd-update-utmp running as pid "PID_FMT, getpid()); | |
269 | ||
270 | if (streq(argv[1], "reboot")) | |
271 | r = on_reboot(&c); | |
272 | else if (streq(argv[1], "shutdown")) | |
273 | r = on_shutdown(&c); | |
274 | else if (streq(argv[1], "runlevel")) | |
275 | r = on_runlevel(&c); | |
276 | else { | |
277 | log_error("Unknown command %s", argv[1]); | |
278 | r = -EINVAL; | |
279 | } | |
280 | ||
281 | log_debug("systemd-update-utmp stopped as pid "PID_FMT, getpid()); | |
282 | ||
283 | finish: | |
284 | #ifdef HAVE_AUDIT | |
285 | if (c.audit_fd >= 0) | |
286 | audit_close(c.audit_fd); | |
287 | #endif | |
288 | ||
289 | sd_bus_unref(c.bus); | |
290 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
291 | } |