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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" |
5cb5a6ff | 30 | |
f50e0a01 LP |
31 | static const UnitActiveState state_translation_table[_DEVICE_STATE_MAX] = { |
32 | [DEVICE_DEAD] = UNIT_INACTIVE, | |
33 | [DEVICE_AVAILABLE] = UNIT_ACTIVE | |
34 | }; | |
35 | ||
36 | static const char* const state_string_table[_DEVICE_STATE_MAX] = { | |
37 | [DEVICE_DEAD] = "dead", | |
38 | [DEVICE_AVAILABLE] = "available" | |
39 | }; | |
40 | ||
87f0e418 LP |
41 | static void device_done(Unit *u) { |
42 | Device *d = DEVICE(u); | |
034c6ed7 LP |
43 | |
44 | assert(d); | |
e537352b | 45 | |
25ac040b | 46 | free(d->sysfs); |
e537352b LP |
47 | d->sysfs = NULL; |
48 | } | |
49 | ||
50 | static void device_init(Unit *u) { | |
51 | Device *d = DEVICE(u); | |
52 | ||
53 | assert(d); | |
54 | assert(u->meta.load_state == UNIT_STUB); | |
55 | ||
56 | d->state = 0; | |
034c6ed7 LP |
57 | } |
58 | ||
f50e0a01 LP |
59 | static void device_set_state(Device *d, DeviceState state) { |
60 | DeviceState old_state; | |
61 | assert(d); | |
5cb5a6ff | 62 | |
f50e0a01 LP |
63 | old_state = d->state; |
64 | d->state = state; | |
5cb5a6ff | 65 | |
e537352b LP |
66 | if (state != old_state) |
67 | log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]); | |
f50e0a01 LP |
68 | |
69 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]); | |
70 | } | |
71 | ||
72 | static int device_coldplug(Unit *u) { | |
73 | Device *d = DEVICE(u); | |
74 | ||
75 | assert(d); | |
76 | assert(d->state == DEVICE_DEAD); | |
77 | ||
78 | if (d->sysfs) | |
79 | device_set_state(d, DEVICE_AVAILABLE); | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static void device_dump(Unit *u, FILE *f, const char *prefix) { | |
25ac040b | 85 | Device *d = DEVICE(u); |
5cb5a6ff | 86 | |
25ac040b | 87 | assert(d); |
5cb5a6ff LP |
88 | |
89 | fprintf(f, | |
25ac040b LP |
90 | "%sDevice State: %s\n" |
91 | "%sSysfs Path: %s\n", | |
f50e0a01 LP |
92 | prefix, state_string_table[d->state], |
93 | prefix, strna(d->sysfs)); | |
94 | } | |
95 | ||
96 | static UnitActiveState device_active_state(Unit *u) { | |
97 | assert(u); | |
98 | ||
99 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
100 | } |
101 | ||
2e478a46 | 102 | static int device_add_escaped_name(Unit *u, const char *dn, bool make_id) { |
25ac040b LP |
103 | char *e; |
104 | int r; | |
105 | ||
106 | assert(u); | |
107 | assert(dn); | |
108 | assert(dn[0] == '/'); | |
109 | ||
2e478a46 | 110 | if (!(e = unit_name_escape_path(dn+1, ".device"))) |
25ac040b LP |
111 | return -ENOMEM; |
112 | ||
113 | r = unit_add_name(u, e); | |
b08d03ff LP |
114 | |
115 | if (r >= 0 && make_id) | |
116 | unit_choose_id(u, e); | |
117 | ||
25ac040b LP |
118 | free(e); |
119 | ||
120 | if (r < 0 && r != -EEXIST) | |
121 | return r; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
aab14b13 LP |
126 | static int device_find_escape_name(Manager *m, const char *dn, Unit **_u) { |
127 | char *e; | |
128 | Unit *u; | |
129 | ||
130 | assert(m); | |
131 | assert(dn); | |
132 | assert(dn[0] == '/'); | |
133 | assert(_u); | |
134 | ||
135 | if (!(e = unit_name_escape_path(dn+1, ".device"))) | |
136 | return -ENOMEM; | |
137 | ||
138 | u = manager_get_unit(m, e); | |
139 | free(e); | |
140 | ||
141 | if (u) { | |
142 | *_u = u; | |
143 | return 1; | |
144 | } | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
6326a423 LP |
149 | static bool devnode_is_api(const char *node) { |
150 | unsigned i; | |
151 | ||
152 | static const char * const table[] = { | |
153 | "/dev/null", | |
154 | "/dev/zero", | |
155 | "/dev/urandom", | |
156 | "/dev/random", | |
157 | "/dev/port", | |
158 | "/dev/oldmem", | |
159 | "/dev/full", | |
160 | "/dev/kmsg", | |
161 | "/dev/mem" | |
162 | }; | |
163 | ||
164 | for (i = 0; i < ELEMENTSOF(table); i++) | |
165 | if (streq(table[i], node)) | |
166 | return true; | |
167 | ||
168 | return false; | |
169 | } | |
170 | ||
f94ea366 | 171 | static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) { |
aab14b13 | 172 | const char *dn, *names, *wants, *sysfs, *expose, *model; |
25ac040b LP |
173 | Unit *u = NULL; |
174 | int r; | |
aab14b13 | 175 | char *w, *state; |
25ac040b LP |
176 | size_t l; |
177 | bool delete; | |
178 | struct udev_list_entry *item = NULL, *first = NULL; | |
179 | ||
180 | assert(m); | |
181 | ||
7f275a9f LP |
182 | if (!(sysfs = udev_device_get_syspath(dev))) |
183 | return -ENOMEM; | |
184 | ||
25ac040b LP |
185 | /* Check whether this entry is even relevant for us. */ |
186 | dn = udev_device_get_devnode(dev); | |
7f275a9f | 187 | expose = udev_device_get_property_value(dev, "SYSTEMD_EXPOSE"); |
25ac040b LP |
188 | names = udev_device_get_property_value(dev, "SYSTEMD_NAMES"); |
189 | wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"); | |
190 | ||
7f275a9f LP |
191 | if (expose) { |
192 | int b; | |
193 | ||
194 | if ((b = parse_boolean(expose)) < 0) { | |
195 | log_error("Failed to parse SYSTEMD_EXPOSE udev property for device %s: %s", sysfs, expose); | |
196 | return 0; | |
197 | } | |
198 | ||
199 | if (!b) | |
200 | return 0; | |
201 | } else | |
6326a423 | 202 | if ((!dn || devnode_is_api(dn)) && !names && !wants) |
7f275a9f | 203 | return 0; |
25ac040b LP |
204 | |
205 | /* Ok, seems kinda interesting. Now, let's see if this one | |
206 | * already exists. */ | |
207 | ||
aab14b13 LP |
208 | if ((r = device_find_escape_name(m, sysfs, &u)) < 0) |
209 | return r; | |
25ac040b | 210 | |
aab14b13 LP |
211 | if (r == 0 && dn) |
212 | if ((r = device_find_escape_name(m, dn, &u)) < 0) | |
213 | return r; | |
25ac040b | 214 | |
aab14b13 LP |
215 | if (r == 0) { |
216 | first = udev_device_get_devlinks_list_entry(dev); | |
217 | udev_list_entry_foreach(item, first) { | |
218 | if ((r = device_find_escape_name(m, udev_list_entry_get_name(item), &u)) < 0) | |
219 | return r; | |
25ac040b | 220 | |
aab14b13 LP |
221 | if (r > 0) |
222 | break; | |
25ac040b | 223 | } |
aab14b13 LP |
224 | } |
225 | ||
226 | /* FIXME: this needs proper merging */ | |
227 | ||
228 | assert((r > 0) == !!u); | |
229 | ||
230 | /* If this is a different unit, then let's not merge things */ | |
231 | if (u && DEVICE(u)->sysfs && !streq(DEVICE(u)->sysfs, sysfs)) | |
232 | u = NULL; | |
25ac040b | 233 | |
aab14b13 LP |
234 | if (!u) { |
235 | delete = true; | |
236 | ||
237 | if (!(u = unit_new(m))) | |
238 | return -ENOMEM; | |
25ac040b | 239 | |
aab14b13 | 240 | if ((r = device_add_escaped_name(u, sysfs, true)) < 0) |
25ac040b LP |
241 | goto fail; |
242 | ||
e537352b LP |
243 | unit_add_to_load_queue(u); |
244 | } else | |
245 | delete = false; | |
246 | ||
247 | if (!(DEVICE(u)->sysfs)) | |
25ac040b LP |
248 | if (!(DEVICE(u)->sysfs = strdup(sysfs))) { |
249 | r = -ENOMEM; | |
250 | goto fail; | |
251 | } | |
252 | ||
25ac040b | 253 | if (dn) |
2e478a46 | 254 | if ((r = device_add_escaped_name(u, dn, true)) < 0) |
25ac040b LP |
255 | goto fail; |
256 | ||
257 | first = udev_device_get_devlinks_list_entry(dev); | |
258 | udev_list_entry_foreach(item, first) | |
2e478a46 | 259 | if ((r = device_add_escaped_name(u, udev_list_entry_get_name(item), false)) < 0) |
25ac040b LP |
260 | goto fail; |
261 | ||
aab14b13 LP |
262 | if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) || |
263 | (model = udev_device_get_property_value(dev, "ID_MODEL"))) { | |
264 | if ((r = unit_set_description(u, model)) < 0) | |
265 | goto fail; | |
266 | } else if (dn) | |
267 | if ((r = unit_set_description(u, dn)) < 0) | |
268 | goto fail; | |
269 | ||
270 | /* We don't remove names that are gone. But that should be | |
271 | * fine and should probably be fixed only on a configuration | |
272 | * refresh. */ | |
273 | ||
25ac040b LP |
274 | if (names) { |
275 | FOREACH_WORD(w, l, names, state) { | |
aab14b13 LP |
276 | char *e; |
277 | ||
b866264a LP |
278 | if (!(e = strndup(w, l))) { |
279 | r = -ENOMEM; | |
25ac040b | 280 | goto fail; |
b866264a | 281 | } |
25ac040b LP |
282 | |
283 | r = unit_add_name(u, e); | |
284 | free(e); | |
285 | ||
286 | if (r < 0 && r != -EEXIST) | |
287 | goto fail; | |
288 | } | |
289 | } | |
290 | ||
25ac040b LP |
291 | if (wants) { |
292 | FOREACH_WORD(w, l, wants, state) { | |
aab14b13 LP |
293 | char *e; |
294 | ||
b866264a LP |
295 | if (!(e = strndup(w, l))) { |
296 | r = -ENOMEM; | |
25ac040b | 297 | goto fail; |
b866264a | 298 | } |
25ac040b LP |
299 | |
300 | r = unit_add_dependency_by_name(u, UNIT_WANTS, e); | |
301 | free(e); | |
302 | ||
303 | if (r < 0) | |
304 | goto fail; | |
305 | } | |
306 | } | |
307 | ||
f94ea366 LP |
308 | if (update_state) { |
309 | manager_dispatch_load_queue(u->meta.manager); | |
310 | device_set_state(DEVICE(u), DEVICE_AVAILABLE); | |
311 | } | |
312 | ||
c1e1601e LP |
313 | unit_add_to_dbus_queue(u); |
314 | ||
25ac040b LP |
315 | return 0; |
316 | ||
317 | fail: | |
318 | if (delete && u) | |
319 | unit_free(u); | |
320 | return r; | |
321 | } | |
322 | ||
f94ea366 | 323 | static int device_process_path(Manager *m, const char *path, bool update_state) { |
25ac040b LP |
324 | int r; |
325 | struct udev_device *dev; | |
326 | ||
327 | assert(m); | |
328 | assert(path); | |
329 | ||
330 | if (!(dev = udev_device_new_from_syspath(m->udev, path))) { | |
331 | log_warning("Failed to get udev device object from udev for path %s.", path); | |
332 | return -ENOMEM; | |
333 | } | |
334 | ||
f94ea366 | 335 | r = device_process_new_device(m, dev, update_state); |
25ac040b LP |
336 | udev_device_unref(dev); |
337 | return r; | |
338 | } | |
339 | ||
f94ea366 LP |
340 | static int device_process_removed_device(Manager *m, struct udev_device *dev) { |
341 | const char *sysfs; | |
342 | char *e; | |
343 | Unit *u; | |
344 | Device *d; | |
345 | ||
346 | assert(m); | |
347 | assert(dev); | |
348 | ||
349 | if (!(sysfs = udev_device_get_syspath(dev))) | |
350 | return -ENOMEM; | |
351 | ||
352 | assert(sysfs[0] == '/'); | |
2e478a46 | 353 | if (!(e = unit_name_escape_path(sysfs+1, ".device"))) |
f94ea366 LP |
354 | return -ENOMEM; |
355 | ||
356 | u = manager_get_unit(m, e); | |
357 | free(e); | |
358 | ||
359 | if (!u) | |
360 | return 0; | |
361 | ||
362 | d = DEVICE(u); | |
363 | free(d->sysfs); | |
364 | d->sysfs = NULL; | |
365 | ||
366 | device_set_state(d, DEVICE_DEAD); | |
367 | return 0; | |
368 | } | |
369 | ||
25ac040b LP |
370 | static void device_shutdown(Manager *m) { |
371 | assert(m); | |
372 | ||
f94ea366 LP |
373 | if (m->udev_monitor) |
374 | udev_monitor_unref(m->udev_monitor); | |
375 | ||
25ac040b LP |
376 | if (m->udev) |
377 | udev_unref(m->udev); | |
378 | } | |
379 | ||
380 | static int device_enumerate(Manager *m) { | |
f94ea366 | 381 | struct epoll_event ev; |
25ac040b LP |
382 | int r; |
383 | struct udev_enumerate *e = NULL; | |
384 | struct udev_list_entry *item = NULL, *first = NULL; | |
385 | ||
386 | assert(m); | |
387 | ||
388 | if (!(m->udev = udev_new())) | |
389 | return -ENOMEM; | |
390 | ||
f94ea366 LP |
391 | if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) { |
392 | r = -ENOMEM; | |
393 | goto fail; | |
394 | } | |
395 | ||
396 | if (udev_monitor_enable_receiving(m->udev_monitor) < 0) { | |
397 | r = -EIO; | |
398 | goto fail; | |
399 | } | |
400 | ||
401 | m->udev_watch.type = WATCH_UDEV; | |
402 | m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor); | |
403 | ||
404 | zero(ev); | |
405 | ev.events = EPOLLIN; | |
406 | ev.data.ptr = &m->udev_watch; | |
407 | ||
408 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0) | |
409 | return -errno; | |
410 | ||
25ac040b LP |
411 | if (!(e = udev_enumerate_new(m->udev))) { |
412 | r = -ENOMEM; | |
413 | goto fail; | |
414 | } | |
415 | ||
416 | if (udev_enumerate_scan_devices(e) < 0) { | |
417 | r = -EIO; | |
418 | goto fail; | |
419 | } | |
420 | ||
421 | first = udev_enumerate_get_list_entry(e); | |
422 | udev_list_entry_foreach(item, first) | |
f94ea366 | 423 | device_process_path(m, udev_list_entry_get_name(item), false); |
25ac040b LP |
424 | |
425 | udev_enumerate_unref(e); | |
25ac040b LP |
426 | return 0; |
427 | ||
428 | fail: | |
429 | if (e) | |
430 | udev_enumerate_unref(e); | |
431 | ||
432 | device_shutdown(m); | |
433 | return r; | |
5cb5a6ff LP |
434 | } |
435 | ||
f94ea366 LP |
436 | void device_fd_event(Manager *m, int events) { |
437 | struct udev_device *dev; | |
438 | int r; | |
439 | const char *action; | |
440 | ||
441 | assert(m); | |
442 | assert(events == EPOLLIN); | |
443 | ||
f94ea366 LP |
444 | if (!(dev = udev_monitor_receive_device(m->udev_monitor))) { |
445 | log_error("Failed to receive device."); | |
446 | return; | |
447 | } | |
448 | ||
449 | if (!(action = udev_device_get_action(dev))) { | |
450 | log_error("Failed to get udev action string."); | |
451 | goto fail; | |
452 | } | |
453 | ||
454 | if (streq(action, "remove")) { | |
455 | if ((r = device_process_removed_device(m, dev)) < 0) { | |
456 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
457 | goto fail; | |
458 | } | |
459 | } else { | |
460 | if ((r = device_process_new_device(m, dev, true)) < 0) { | |
461 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
462 | goto fail; | |
463 | } | |
464 | } | |
465 | ||
466 | fail: | |
467 | udev_device_unref(dev); | |
468 | } | |
469 | ||
87f0e418 | 470 | const UnitVTable device_vtable = { |
5cb5a6ff LP |
471 | .suffix = ".device", |
472 | ||
e537352b LP |
473 | .init = device_init, |
474 | .load = unit_load_fragment_and_dropin_optional, | |
034c6ed7 | 475 | .done = device_done, |
f50e0a01 LP |
476 | .coldplug = device_coldplug, |
477 | ||
5cb5a6ff LP |
478 | .dump = device_dump, |
479 | ||
f50e0a01 | 480 | .active_state = device_active_state, |
25ac040b | 481 | |
f50e0a01 LP |
482 | .enumerate = device_enumerate, |
483 | .shutdown = device_shutdown | |
5cb5a6ff | 484 | }; |