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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 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 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 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <dbus/dbus.h> | |
23 | ||
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | #include "util.h" | |
29 | #include "strv.h" | |
30 | #include "dbus-common.h" | |
31 | #include "polkit.h" | |
32 | ||
33 | #define NULL_ADJTIME_UTC "0.0 0 0\n0\nUTC\n" | |
34 | #define NULL_ADJTIME_LOCAL "0.0 0 0\n0\nLOCAL\n" | |
35 | ||
36 | #define INTROSPECTION \ | |
37 | DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE \ | |
38 | "<node>\n" \ | |
39 | " <interface name=\"org.freedesktop.timedate1\">\n" \ | |
40 | " <property name=\"Timezone\" type=\"s\" access=\"read\"/>\n" \ | |
41 | " <property name=\"LocalRTC\" type=\"b\" access=\"read\"/>\n" \ | |
42 | " <method name=\"SetTime\">\n" \ | |
43 | " <arg name=\"usec_utc\" type=\"x\" direction=\"in\"/>\n" \ | |
44 | " <arg name=\"relative\" type=\"b\" direction=\"in\"/>\n" \ | |
45 | " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ | |
46 | " </method>\n" \ | |
47 | " <method name=\"SetTimezone\">\n" \ | |
48 | " <arg name=\"timezone\" type=\"s\" direction=\"in\"/>\n" \ | |
49 | " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ | |
50 | " </method>\n" \ | |
51 | " <method name=\"SetLocalRTC\">\n" \ | |
52 | " <arg name=\"local_rtc\" type=\"b\" direction=\"in\"/>\n" \ | |
53 | " <arg name=\"user_interaction\" type=\"b\" direction=\"in\"/>\n" \ | |
54 | " </method>\n" \ | |
55 | " </interface>\n" \ | |
56 | BUS_PROPERTIES_INTERFACE \ | |
57 | BUS_INTROSPECTABLE_INTERFACE \ | |
58 | BUS_PEER_INTERFACE \ | |
59 | "</node>\n" | |
60 | ||
61 | #define INTERFACES_LIST \ | |
62 | BUS_GENERIC_INTERFACES_LIST \ | |
63 | "org.freedesktop.locale1\0" | |
64 | ||
65 | static char *zone = NULL; | |
66 | static bool local_rtc = false; | |
67 | ||
68 | static void free_data(void) { | |
69 | free(zone); | |
70 | zone = NULL; | |
71 | ||
72 | local_rtc = false; | |
73 | } | |
74 | ||
75 | static bool valid_timezone(const char *name) { | |
76 | const char *p; | |
77 | char *t; | |
78 | bool slash = false; | |
79 | int r; | |
80 | struct stat st; | |
81 | ||
82 | assert(name); | |
83 | ||
84 | if (*name == '/' || *name == 0) | |
85 | return false; | |
86 | ||
87 | for (p = name; *p; p++) { | |
88 | if (!(*p >= '0' && *p <= '9') && | |
89 | !(*p >= 'a' && *p <= 'z') && | |
90 | !(*p >= 'A' && *p <= 'Z') && | |
91 | !(*p == '-' || *p == '_' || *p == '+' || *p == '/')) | |
92 | return false; | |
93 | ||
94 | if (*p == '/') { | |
95 | ||
96 | if (slash) | |
97 | return false; | |
98 | ||
99 | slash = true; | |
100 | } else | |
101 | slash = false; | |
102 | } | |
103 | ||
104 | if (slash) | |
105 | return false; | |
106 | ||
107 | t = strappend("/usr/share/zoneinfo/", name); | |
108 | if (!t) | |
109 | return false; | |
110 | ||
111 | r = stat(t, &st); | |
112 | free(t); | |
113 | ||
114 | if (r < 0) | |
115 | return false; | |
116 | ||
117 | if (!S_ISREG(st.st_mode)) | |
118 | return false; | |
119 | ||
120 | return true; | |
121 | } | |
122 | ||
123 | static void verify_timezone(void) { | |
124 | char *p, *a = NULL, *b = NULL; | |
125 | size_t l, q; | |
126 | int j, k; | |
127 | ||
128 | if (!zone) | |
129 | return; | |
130 | ||
131 | p = strappend("/usr/share/zoneinfo/", zone); | |
132 | if (!p) { | |
133 | log_error("Out of memory"); | |
134 | return; | |
135 | } | |
136 | ||
137 | j = read_full_file("/etc/localtime", &a, &l); | |
138 | k = read_full_file(p, &b, &q); | |
139 | ||
140 | free(p); | |
141 | ||
142 | if (j < 0 || k < 0 || l != q || memcmp(a, b, l)) { | |
143 | log_warning("/etc/localtime and /etc/timezone out of sync."); | |
144 | free(zone); | |
145 | zone = NULL; | |
146 | } | |
147 | ||
148 | free(a); | |
149 | free(b); | |
150 | } | |
151 | ||
152 | static int read_data(void) { | |
153 | int r; | |
154 | FILE *f; | |
155 | ||
156 | free_data(); | |
157 | ||
158 | r = read_one_line_file("/etc/timezone", &zone); | |
159 | if (r < 0 && r != -ENOENT) | |
160 | return r; | |
161 | ||
162 | verify_timezone(); | |
163 | ||
164 | f = fopen("/etc/adjtime", "r"); | |
165 | if (f) { | |
166 | char line[LINE_MAX]; | |
167 | bool b; | |
168 | ||
169 | b = fgets(line, sizeof(line), f) && | |
170 | fgets(line, sizeof(line), f) && | |
171 | fgets(line, sizeof(line), f); | |
172 | ||
173 | fclose(f); | |
174 | ||
175 | if (!b) | |
176 | return -EIO; | |
177 | ||
178 | truncate_nl(line); | |
179 | local_rtc = streq(line, "LOCAL"); | |
180 | ||
181 | } else if (errno != ENOENT) | |
182 | return -errno; | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | static int write_data_timezone(void) { | |
188 | int r = 0; | |
189 | char *p; | |
190 | ||
191 | if (!zone) { | |
192 | if (unlink("/etc/timezone") < 0 && errno != ENOENT) | |
193 | r = -errno; | |
194 | ||
195 | if (unlink("/etc/localtime") < 0 && errno != ENOENT) | |
196 | r = -errno; | |
197 | ||
198 | return r; | |
199 | } | |
200 | ||
201 | p = strappend("/usr/share/zoneinfo/", zone); | |
202 | if (!p) { | |
203 | log_error("Out of memory"); | |
204 | return -ENOMEM; | |
205 | } | |
206 | ||
207 | r = symlink_or_copy_atomic(p, "/etc/localtime"); | |
208 | free(p); | |
209 | ||
210 | if (r < 0) | |
211 | return r; | |
212 | ||
213 | r = write_one_line_file_atomic("/etc/timezone", zone); | |
214 | if (r < 0) | |
215 | return r; | |
216 | ||
217 | return 0; | |
218 | } | |
219 | ||
220 | static int write_data_local_rtc(void) { | |
221 | int r; | |
222 | char *s, *w; | |
223 | ||
224 | r = read_full_file("/etc/adjtime", &s, NULL); | |
225 | if (r < 0) { | |
226 | if (r != -ENOENT) | |
227 | return r; | |
228 | ||
229 | if (!local_rtc) | |
230 | return 0; | |
231 | ||
232 | w = strdup(NULL_ADJTIME_LOCAL); | |
233 | if (!w) | |
234 | return -ENOMEM; | |
235 | } else { | |
236 | char *p, *e; | |
237 | size_t a, b; | |
238 | ||
239 | p = strchr(s, '\n'); | |
240 | if (!p) { | |
241 | free(s); | |
242 | return -EIO; | |
243 | } | |
244 | ||
245 | p = strchr(p+1, '\n'); | |
246 | if (!p) { | |
247 | free(s); | |
248 | return -EIO; | |
249 | } | |
250 | ||
251 | p++; | |
252 | e = strchr(p, '\n'); | |
253 | if (!p) { | |
254 | free(s); | |
255 | return -EIO; | |
256 | } | |
257 | ||
258 | a = p - s; | |
259 | b = strlen(e); | |
260 | ||
261 | w = new(char, a + (local_rtc ? 5 : 3) + b + 1); | |
262 | if (!w) { | |
263 | free(s); | |
264 | return -ENOMEM; | |
265 | } | |
266 | ||
267 | *(char*) mempcpy(stpcpy(mempcpy(w, s, a), local_rtc ? "LOCAL" : "UTC"), e, b) = 0; | |
268 | ||
269 | if (streq(w, NULL_ADJTIME_UTC)) { | |
270 | free(w); | |
271 | ||
272 | if (unlink("/etc/adjtime") < 0) { | |
273 | if (errno != ENOENT) | |
274 | return -errno; | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | } | |
280 | ||
281 | r = write_one_line_file_atomic("/etc/adjtime", w); | |
282 | free(w); | |
283 | ||
284 | return r; | |
285 | } | |
286 | ||
287 | static DBusHandlerResult timedate_message_handler( | |
288 | DBusConnection *connection, | |
289 | DBusMessage *message, | |
290 | void *userdata) { | |
291 | ||
292 | const BusProperty properties[] = { | |
293 | { "org.freedesktop.timedate1", "Timezone", bus_property_append_string, "s", zone }, | |
294 | { "org.freedesktop.timedate1", "LocalRTC", bus_property_append_bool, "b", &local_rtc }, | |
295 | { NULL, NULL, NULL, NULL, NULL } | |
296 | }; | |
297 | ||
298 | DBusMessage *reply = NULL, *changed = NULL; | |
299 | DBusError error; | |
300 | int r; | |
301 | ||
302 | assert(connection); | |
303 | assert(message); | |
304 | ||
305 | dbus_error_init(&error); | |
306 | ||
307 | if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTimezone")) { | |
308 | const char *z; | |
309 | dbus_bool_t interactive; | |
310 | ||
311 | if (!dbus_message_get_args( | |
312 | message, | |
313 | &error, | |
314 | DBUS_TYPE_STRING, &z, | |
315 | DBUS_TYPE_BOOLEAN, &interactive, | |
316 | DBUS_TYPE_INVALID)) | |
317 | return bus_send_error_reply(connection, message, &error, -EINVAL); | |
318 | ||
319 | if (!valid_timezone(z)) | |
320 | return bus_send_error_reply(connection, message, NULL, -EINVAL); | |
321 | ||
322 | if (!streq_ptr(z, zone)) { | |
323 | char *t; | |
324 | ||
325 | r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-timezone", interactive, &error); | |
326 | if (r < 0) | |
327 | return bus_send_error_reply(connection, message, &error, r); | |
328 | ||
329 | t = strdup(z); | |
330 | if (!t) | |
331 | goto oom; | |
332 | ||
333 | free(zone); | |
334 | zone = t; | |
335 | ||
336 | r = write_data_timezone(); | |
337 | if (r < 0) { | |
338 | log_error("Failed to set timezone: %s", strerror(-r)); | |
339 | return bus_send_error_reply(connection, message, NULL, r); | |
340 | } | |
341 | ||
342 | log_info("Changed timezone to '%s'.", zone); | |
343 | ||
344 | changed = bus_properties_changed_new( | |
345 | "/org/freedesktop/timedate1", | |
346 | "org.freedesktop.timedate1", | |
347 | "Timezone\0"); | |
348 | if (!changed) | |
349 | goto oom; | |
350 | } | |
351 | ||
352 | } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetLocalRTC")) { | |
353 | dbus_bool_t lrtc; | |
354 | dbus_bool_t interactive; | |
355 | ||
356 | if (!dbus_message_get_args( | |
357 | message, | |
358 | &error, | |
359 | DBUS_TYPE_BOOLEAN, &lrtc, | |
360 | DBUS_TYPE_BOOLEAN, &interactive, | |
361 | DBUS_TYPE_INVALID)) | |
362 | return bus_send_error_reply(connection, message, &error, -EINVAL); | |
363 | ||
364 | if (lrtc != local_rtc) { | |
365 | r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-local-rtc", interactive, &error); | |
366 | if (r < 0) | |
367 | return bus_send_error_reply(connection, message, &error, r); | |
368 | ||
369 | local_rtc = lrtc; | |
370 | ||
371 | r = write_data_local_rtc(); | |
372 | if (r < 0) { | |
373 | log_error("Failed to set RTC to local/UTC: %s", strerror(-r)); | |
374 | return bus_send_error_reply(connection, message, NULL, r); | |
375 | } | |
376 | ||
377 | log_info("Changed local RTC setting to '%s'.", yes_no(local_rtc)); | |
378 | ||
379 | changed = bus_properties_changed_new( | |
380 | "/org/freedesktop/timedate1", | |
381 | "org.freedesktop.timedate1", | |
382 | "LocalRTC\0"); | |
383 | if (!changed) | |
384 | goto oom; | |
385 | } | |
386 | ||
387 | } else if (dbus_message_is_method_call(message, "org.freedesktop.timedate1", "SetTime")) { | |
388 | int64_t utc; | |
389 | dbus_bool_t relative; | |
390 | dbus_bool_t interactive; | |
391 | ||
392 | if (!dbus_message_get_args( | |
393 | message, | |
394 | &error, | |
395 | DBUS_TYPE_INT64, &utc, | |
396 | DBUS_TYPE_BOOLEAN, &relative, | |
397 | DBUS_TYPE_BOOLEAN, &interactive, | |
398 | DBUS_TYPE_INVALID)) | |
399 | return bus_send_error_reply(connection, message, &error, -EINVAL); | |
400 | ||
401 | if (!relative && utc <= 0) | |
402 | return bus_send_error_reply(connection, message, NULL, -EINVAL); | |
403 | ||
404 | if (!relative || utc != 0) { | |
405 | struct timespec ts; | |
406 | ||
407 | r = verify_polkit(connection, message, "org.freedesktop.timedate1.set-time", interactive, &error); | |
408 | if (r < 0) | |
409 | return bus_send_error_reply(connection, message, &error, r); | |
410 | ||
411 | if (relative) | |
412 | timespec_store(&ts, now(CLOCK_REALTIME) + utc); | |
413 | else | |
414 | timespec_store(&ts, utc); | |
415 | ||
416 | if (clock_settime(CLOCK_REALTIME, &ts) < 0) { | |
417 | log_error("Failed to set local time: %m"); | |
418 | return bus_send_error_reply(connection, message, NULL, -errno); | |
419 | } | |
420 | ||
421 | log_info("Changed local time to %s", ctime(&ts.tv_sec)); | |
422 | } | |
423 | ||
424 | } else | |
425 | return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties); | |
426 | ||
427 | if (!(reply = dbus_message_new_method_return(message))) | |
428 | goto oom; | |
429 | ||
430 | if (!dbus_connection_send(connection, reply, NULL)) | |
431 | goto oom; | |
432 | ||
433 | dbus_message_unref(reply); | |
434 | reply = NULL; | |
435 | ||
436 | if (changed) { | |
437 | ||
438 | if (!dbus_connection_send(connection, changed, NULL)) | |
439 | goto oom; | |
440 | ||
441 | dbus_message_unref(changed); | |
442 | } | |
443 | ||
444 | return DBUS_HANDLER_RESULT_HANDLED; | |
445 | ||
446 | oom: | |
447 | if (reply) | |
448 | dbus_message_unref(reply); | |
449 | ||
450 | if (changed) | |
451 | dbus_message_unref(changed); | |
452 | ||
453 | dbus_error_free(&error); | |
454 | ||
455 | return DBUS_HANDLER_RESULT_NEED_MEMORY; | |
456 | } | |
457 | ||
458 | static int connect_bus(DBusConnection **_bus) { | |
459 | static const DBusObjectPathVTable timedate_vtable = { | |
460 | .message_function = timedate_message_handler | |
461 | }; | |
462 | DBusError error; | |
463 | DBusConnection *bus = NULL; | |
464 | int r; | |
465 | ||
466 | assert(_bus); | |
467 | ||
468 | dbus_error_init(&error); | |
469 | ||
470 | bus = dbus_bus_get_private(DBUS_BUS_SYSTEM, &error); | |
471 | if (!bus) { | |
472 | log_error("Failed to get system D-Bus connection: %s", error.message); | |
473 | r = -ECONNREFUSED; | |
474 | goto fail; | |
475 | } | |
476 | ||
477 | if (!dbus_connection_register_object_path(bus, "/org/freedesktop/timedate1", &timedate_vtable, NULL)) { | |
478 | log_error("Not enough memory"); | |
479 | r = -ENOMEM; | |
480 | goto fail; | |
481 | } | |
482 | ||
483 | if (dbus_bus_request_name(bus, "org.freedesktop.timedate1", DBUS_NAME_FLAG_DO_NOT_QUEUE, &error) < 0) { | |
484 | log_error("Failed to register name on bus: %s", error.message); | |
485 | r = -EEXIST; | |
486 | goto fail; | |
487 | } | |
488 | ||
489 | if (_bus) | |
490 | *_bus = bus; | |
491 | ||
492 | return 0; | |
493 | ||
494 | fail: | |
495 | dbus_connection_close(bus); | |
496 | dbus_connection_unref(bus); | |
497 | ||
498 | dbus_error_free(&error); | |
499 | ||
500 | return r; | |
501 | } | |
502 | ||
503 | int main(int argc, char *argv[]) { | |
504 | int r; | |
505 | DBusConnection *bus = NULL; | |
506 | ||
507 | log_set_target(LOG_TARGET_AUTO); | |
508 | log_parse_environment(); | |
509 | log_open(); | |
510 | ||
511 | if (argc != 1) { | |
512 | log_error("This program takes no arguments."); | |
513 | r = -EINVAL; | |
514 | goto finish; | |
515 | } | |
516 | ||
517 | umask(0022); | |
518 | ||
519 | r = read_data(); | |
520 | if (r < 0) { | |
521 | log_error("Failed to read timezone data: %s", strerror(-r)); | |
522 | goto finish; | |
523 | } | |
524 | ||
525 | r = connect_bus(&bus); | |
526 | if (r < 0) | |
527 | goto finish; | |
528 | ||
529 | while (dbus_connection_read_write_dispatch(bus, -1)) | |
530 | ; | |
531 | ||
532 | r = 0; | |
533 | ||
534 | finish: | |
535 | free_data(); | |
536 | ||
537 | if (bus) { | |
538 | dbus_connection_flush(bus); | |
539 | dbus_connection_close(bus); | |
540 | dbus_connection_unref(bus); | |
541 | } | |
542 | ||
543 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
544 | } |