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Commit | Line | Data |
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5cb5a6ff LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
a7334b09 LP |
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 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 | ||
25ac040b | 22 | #include <errno.h> |
f94ea366 | 23 | #include <sys/epoll.h> |
25ac040b LP |
24 | #include <libudev.h> |
25 | ||
87f0e418 | 26 | #include "unit.h" |
5cb5a6ff LP |
27 | #include "device.h" |
28 | #include "strv.h" | |
25ac040b | 29 | #include "log.h" |
9e2f7c11 | 30 | #include "unit-name.h" |
4139c1b2 | 31 | #include "dbus-device.h" |
5cb5a6ff | 32 | |
f50e0a01 LP |
33 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
34 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
35 | [DEVICE_AVAILABLE] = UNIT_ACTIVE | |
36 | }; | |
37 | ||
38 | static const char* const state_string_table[_DEVICE_STATE_MAX] = { | |
39 | [DEVICE_DEAD] = "dead", | |
40 | [DEVICE_AVAILABLE] = "available" | |
41 | }; | |
42 | ||
87f0e418 LP |
43 | static void device_done(Unit *u) { |
44 | Device *d = DEVICE(u); | |
034c6ed7 LP |
45 | |
46 | assert(d); | |
e537352b | 47 | |
25ac040b | 48 | free(d->sysfs); |
e537352b LP |
49 | d->sysfs = NULL; |
50 | } | |
51 | ||
52 | static void device_init(Unit *u) { | |
53 | Device *d = DEVICE(u); | |
54 | ||
55 | assert(d); | |
56 | assert(u->meta.load_state == UNIT_STUB); | |
57 | ||
58 | d->state = 0; | |
034c6ed7 LP |
59 | } |
60 | ||
f50e0a01 LP |
61 | static void device_set_state(Device *d, DeviceState state) { |
62 | DeviceState old_state; | |
63 | assert(d); | |
5cb5a6ff | 64 | |
f50e0a01 LP |
65 | old_state = d->state; |
66 | d->state = state; | |
5cb5a6ff | 67 | |
e537352b | 68 | if (state != old_state) |
9e2f7c11 | 69 | log_debug("%s changed %s → %s", UNIT(d)->meta.id, state_string_table[old_state], state_string_table[state]); |
f50e0a01 LP |
70 | |
71 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]); | |
72 | } | |
73 | ||
74 | static int device_coldplug(Unit *u) { | |
75 | Device *d = DEVICE(u); | |
76 | ||
77 | assert(d); | |
78 | assert(d->state == DEVICE_DEAD); | |
79 | ||
80 | if (d->sysfs) | |
81 | device_set_state(d, DEVICE_AVAILABLE); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static void device_dump(Unit *u, FILE *f, const char *prefix) { | |
25ac040b | 87 | Device *d = DEVICE(u); |
5cb5a6ff | 88 | |
25ac040b | 89 | assert(d); |
5cb5a6ff LP |
90 | |
91 | fprintf(f, | |
25ac040b LP |
92 | "%sDevice State: %s\n" |
93 | "%sSysfs Path: %s\n", | |
f50e0a01 LP |
94 | prefix, state_string_table[d->state], |
95 | prefix, strna(d->sysfs)); | |
96 | } | |
97 | ||
98 | static UnitActiveState device_active_state(Unit *u) { | |
99 | assert(u); | |
100 | ||
101 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
102 | } |
103 | ||
10a94420 LP |
104 | static const char *device_sub_state_to_string(Unit *u) { |
105 | assert(u); | |
106 | ||
107 | return state_string_table[DEVICE(u)->state]; | |
108 | } | |
109 | ||
2e478a46 | 110 | static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) { |
25ac040b LP |
111 | char *e; |
112 | int r; | |
113 | ||
114 | assert(u); | |
115 | assert(dn); | |
116 | assert(dn[0] == '/'); | |
117 | ||
9e2f7c11 | 118 | if (!(e = unit_name_build_escape(dn+1, NULL, ".device"))) |
25ac040b LP |
119 | return -ENOMEM; |
120 | ||
121 | r = unit_add_name(u, e); | |
b08d03ff LP |
122 | |
123 | if (r >= 0 && make_id) | |
124 | unit_choose_id(u, e); | |
125 | ||
25ac040b LP |
126 | free(e); |
127 | ||
128 | if (r < 0 && r != -EEXIST) | |
129 | return r; | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
aab14b13 LP |
134 | static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) { |
135 | char *e; | |
136 | Unit *u; | |
137 | ||
138 | assert(m); | |
139 | assert(dn); | |
140 | assert(dn[0] == '/'); | |
141 | assert(_u); | |
142 | ||
9e2f7c11 | 143 | if (!(e = unit_name_build_escape(dn+1, NULL, ".device"))) |
aab14b13 LP |
144 | return -ENOMEM; |
145 | ||
146 | u = manager_get_unit(m, e); | |
147 | free(e); | |
148 | ||
149 | if (u) { | |
150 | *_u = u; | |
151 | return 1; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
f94ea366 | 157 | static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) { |
aab14b13 | 158 | const char *dn, *names, *wants, *sysfs, *expose, *model; |
25ac040b LP |
159 | Unit *u = NULL; |
160 | int r; | |
aab14b13 | 161 | char *w, *state; |
25ac040b LP |
162 | size_t l; |
163 | bool delete; | |
164 | struct udev_list_entry *item = NULL, *first = NULL; | |
09e80b16 | 165 | int b; |
25ac040b LP |
166 | |
167 | assert(m); | |
168 | ||
7f275a9f LP |
169 | if (!(sysfs = udev_device_get_syspath(dev))) |
170 | return -ENOMEM; | |
171 | ||
09e80b16 LP |
172 | if (!(expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE"))) |
173 | return 0; | |
174 | ||
175 | if ((b = parse_boolean(expose)) < 0) { | |
176 | log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | if (!b) | |
181 | return 0; | |
182 | ||
25ac040b LP |
183 | /* Check whether this entry is even relevant for us. */ |
184 | dn = udev_device_get_devnode(dev); | |
185 | names = udev_device_get_property_value(dev, "SYSTEMD_NAMES"); | |
186 | wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"); | |
187 | ||
aab14b13 LP |
188 | if ((r = device_find_escape_name(m, sysfs, &u)) < 0) |
189 | return r; | |
25ac040b | 190 | |
aab14b13 LP |
191 | if (r == 0 && dn) |
192 | if ((r = device_find_escape_name(m, dn, &u)) < 0) | |
193 | return r; | |
25ac040b | 194 | |
aab14b13 LP |
195 | if (r == 0) { |
196 | first = udev_device_get_devlinks_list_entry(dev); | |
197 | udev_list_entry_foreach(item, first) { | |
198 | if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0) | |
199 | return r; | |
25ac040b | 200 | |
aab14b13 LP |
201 | if (r > 0) |
202 | break; | |
25ac040b | 203 | } |
aab14b13 LP |
204 | } |
205 | ||
206 | /* FIXME: this needs proper merging */ | |
207 | ||
208 | assert((r > 0) == !!u); | |
209 | ||
210 | /* If this is a different unit, then let's not merge things */ | |
211 | if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs)) | |
212 | u = NULL; | |
25ac040b | 213 | |
aab14b13 LP |
214 | if (!u) { |
215 | delete = true; | |
216 | ||
217 | if (!(u = unit_new(m))) | |
218 | return -ENOMEM; | |
25ac040b | 219 | |
aab14b13 | 220 | if ((r = device_add_escaped_name(u, sysfs, true)) < 0) |
25ac040b LP |
221 | goto fail; |
222 | ||
e537352b LP |
223 | unit_add_to_load_queue(u); |
224 | } else | |
225 | delete = false; | |
226 | ||
227 | if (!(DEVICE(u)->sysfs)) | |
25ac040b LP |
228 | if (!(DEVICE(u)->sysfs = strdup(sysfs))) { |
229 | r = -ENOMEM; | |
230 | goto fail; | |
231 | } | |
232 | ||
25ac040b | 233 | if (dn) |
2e478a46 | 234 | if ((r = device_add_escaped_name(u, dn, true)) < 0) |
25ac040b LP |
235 | goto fail; |
236 | ||
237 | first = udev_device_get_devlinks_list_entry(dev); | |
238 | udev_list_entry_foreach(item, first) | |
2e478a46 | 239 | if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0) |
25ac040b LP |
240 | goto fail; |
241 | ||
aab14b13 LP |
242 | if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) || |
243 | (model = udev_device_get_property_value(dev, "ID_MODEL"))) { | |
244 | if ((r = unit_set_description(u, model)) < 0) | |
245 | goto fail; | |
246 | } else if (dn) | |
247 | if ((r = unit_set_description(u, dn)) < 0) | |
248 | goto fail; | |
249 | ||
250 | /* We don't remove names that are gone. But that should be | |
251 | * fine and should probably be fixed only on a configuration | |
252 | * refresh. */ | |
253 | ||
25ac040b LP |
254 | if (names) { |
255 | FOREACH_WORD(w, l, names, state) { | |
aab14b13 LP |
256 | char *e; |
257 | ||
b866264a LP |
258 | if (!(e = strndup(w, l))) { |
259 | r = -ENOMEM; | |
25ac040b | 260 | goto fail; |
b866264a | 261 | } |
25ac040b LP |
262 | |
263 | r = unit_add_name(u, e); | |
264 | free(e); | |
265 | ||
266 | if (r < 0 && r != -EEXIST) | |
267 | goto fail; | |
268 | } | |
269 | } | |
270 | ||
25ac040b LP |
271 | if (wants) { |
272 | FOREACH_WORD(w, l, wants, state) { | |
aab14b13 LP |
273 | char *e; |
274 | ||
b866264a LP |
275 | if (!(e = strndup(w, l))) { |
276 | r = -ENOMEM; | |
25ac040b | 277 | goto fail; |
b866264a | 278 | } |
25ac040b | 279 | |
9e2f7c11 | 280 | r = unit_add_dependency_by_name(u, UNIT_WANTS, NULL, e); |
25ac040b LP |
281 | free(e); |
282 | ||
283 | if (r < 0) | |
284 | goto fail; | |
285 | } | |
286 | } | |
287 | ||
f94ea366 LP |
288 | if (update_state) { |
289 | manager_dispatch_load_queue(u->meta.manager); | |
290 | device_set_state(DEVICE(u), DEVICE_AVAILABLE); | |
291 | } | |
292 | ||
c1e1601e LP |
293 | unit_add_to_dbus_queue(u); |
294 | ||
25ac040b LP |
295 | return 0; |
296 | ||
297 | fail: | |
298 | if (delete && u) | |
299 | unit_free(u); | |
300 | return r; | |
301 | } | |
302 | ||
f94ea366 | 303 | static int device_process_path(Manager *m, const char *path, bool update_state) { |
25ac040b LP |
304 | int r; |
305 | struct udev_device *dev; | |
306 | ||
307 | assert(m); | |
308 | assert(path); | |
309 | ||
310 | if (!(dev = udev_device_new_from_syspath(m->udev, path))) { | |
311 | log_warning("Failed to get udev device object from udev for path %s.", path); | |
312 | return -ENOMEM; | |
313 | } | |
314 | ||
f94ea366 | 315 | r = device_process_new_device(m, dev, update_state); |
25ac040b LP |
316 | udev_device_unref(dev); |
317 | return r; | |
318 | } | |
319 | ||
f94ea366 LP |
320 | static int device_process_removed_device(Manager *m, struct udev_device *dev) { |
321 | const char *sysfs; | |
322 | char *e; | |
323 | Unit *u; | |
324 | Device *d; | |
325 | ||
326 | assert(m); | |
327 | assert(dev); | |
328 | ||
329 | if (!(sysfs = udev_device_get_syspath(dev))) | |
330 | return -ENOMEM; | |
331 | ||
332 | assert(sysfs[0] == '/'); | |
9e2f7c11 | 333 | if (!(e = unit_name_build_escape(sysfs+1, NULL, ".device"))) |
f94ea366 LP |
334 | return -ENOMEM; |
335 | ||
336 | u = manager_get_unit(m, e); | |
337 | free(e); | |
338 | ||
339 | if (!u) | |
340 | return 0; | |
341 | ||
342 | d = DEVICE(u); | |
343 | free(d->sysfs); | |
344 | d->sysfs = NULL; | |
345 | ||
346 | device_set_state(d, DEVICE_DEAD); | |
347 | return 0; | |
348 | } | |
349 | ||
25ac040b LP |
350 | static void device_shutdown(Manager *m) { |
351 | assert(m); | |
352 | ||
f94ea366 LP |
353 | if (m->udev_monitor) |
354 | udev_monitor_unref(m->udev_monitor); | |
355 | ||
25ac040b LP |
356 | if (m->udev) |
357 | udev_unref(m->udev); | |
358 | } | |
359 | ||
360 | static int device_enumerate(Manager *m) { | |
f94ea366 | 361 | struct epoll_event ev; |
25ac040b LP |
362 | int r; |
363 | struct udev_enumerate *e = NULL; | |
364 | struct udev_list_entry *item = NULL, *first = NULL; | |
365 | ||
366 | assert(m); | |
367 | ||
368 | if (!(m->udev = udev_new())) | |
369 | return -ENOMEM; | |
370 | ||
f94ea366 LP |
371 | if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) { |
372 | r = -ENOMEM; | |
373 | goto fail; | |
374 | } | |
375 | ||
376 | if (udev_monitor_enable_receiving(m->udev_monitor) < 0) { | |
377 | r = -EIO; | |
378 | goto fail; | |
379 | } | |
380 | ||
381 | m->udev_watch.type = WATCH_UDEV; | |
382 | m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor); | |
383 | ||
384 | zero(ev); | |
385 | ev.events = EPOLLIN; | |
386 | ev.data.ptr = &m->udev_watch; | |
387 | ||
388 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0) | |
389 | return -errno; | |
390 | ||
4f2d528d LP |
391 | if (!(e = udev_enumerate_new(m->udev))) { |
392 | r = -ENOMEM; | |
393 | goto fail; | |
394 | } | |
25ac040b | 395 | |
4f2d528d LP |
396 | if (udev_enumerate_scan_devices(e) < 0) { |
397 | r = -EIO; | |
398 | goto fail; | |
399 | } | |
25ac040b | 400 | |
4f2d528d LP |
401 | first = udev_enumerate_get_list_entry(e); |
402 | udev_list_entry_foreach(item, first) | |
403 | device_process_path(m, udev_list_entry_get_name(item), false); | |
25ac040b | 404 | |
4f2d528d | 405 | udev_enumerate_unref(e); |
25ac040b LP |
406 | return 0; |
407 | ||
408 | fail: | |
409 | if (e) | |
410 | udev_enumerate_unref(e); | |
411 | ||
412 | device_shutdown(m); | |
413 | return r; | |
5cb5a6ff LP |
414 | } |
415 | ||
f94ea366 LP |
416 | void device_fd_event(Manager *m, int events) { |
417 | struct udev_device *dev; | |
418 | int r; | |
419 | const char *action; | |
420 | ||
421 | assert(m); | |
422 | assert(events == EPOLLIN); | |
423 | ||
f94ea366 LP |
424 | if (!(dev = udev_monitor_receive_device(m->udev_monitor))) { |
425 | log_error("Failed to receive device."); | |
426 | return; | |
427 | } | |
428 | ||
429 | if (!(action = udev_device_get_action(dev))) { | |
430 | log_error("Failed to get udev action string."); | |
431 | goto fail; | |
432 | } | |
433 | ||
434 | if (streq(action, "remove")) { | |
435 | if ((r = device_process_removed_device(m, dev)) < 0) { | |
436 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
437 | goto fail; | |
438 | } | |
439 | } else { | |
440 | if ((r = device_process_new_device(m, dev, true)) < 0) { | |
441 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
442 | goto fail; | |
443 | } | |
444 | } | |
445 | ||
446 | fail: | |
447 | udev_device_unref(dev); | |
448 | } | |
449 | ||
87f0e418 | 450 | const UnitVTable device_vtable = { |
5cb5a6ff LP |
451 | .suffix = ".device", |
452 | ||
9e2f7c11 LP |
453 | .no_requires = true, |
454 | .no_instances = true, | |
41447faf | 455 | .no_snapshots = true, |
9e2f7c11 | 456 | |
e537352b LP |
457 | .init = device_init, |
458 | .load = unit_load_fragment_and_dropin_optional, | |
034c6ed7 | 459 | .done = device_done, |
f50e0a01 LP |
460 | .coldplug = device_coldplug, |
461 | ||
5cb5a6ff LP |
462 | .dump = device_dump, |
463 | ||
f50e0a01 | 464 | .active_state = device_active_state, |
10a94420 | 465 | .sub_state_to_string = device_sub_state_to_string, |
25ac040b | 466 | |
4139c1b2 LP |
467 | .bus_message_handler = bus_device_message_handler, |
468 | ||
f50e0a01 LP |
469 | .enumerate = device_enumerate, |
470 | .shutdown = device_shutdown | |
5cb5a6ff | 471 | }; |