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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); | |
25ac040b | 45 | free(d->sysfs); |
034c6ed7 LP |
46 | } |
47 | ||
f50e0a01 LP |
48 | static void device_set_state(Device *d, DeviceState state) { |
49 | DeviceState old_state; | |
50 | assert(d); | |
5cb5a6ff | 51 | |
f50e0a01 LP |
52 | old_state = d->state; |
53 | d->state = state; | |
5cb5a6ff | 54 | |
f50e0a01 LP |
55 | log_debug("%s changed %s → %s", unit_id(UNIT(d)), state_string_table[old_state], state_string_table[state]); |
56 | ||
57 | unit_notify(UNIT(d), state_translation_table[old_state], state_translation_table[state]); | |
58 | } | |
59 | ||
60 | static int device_coldplug(Unit *u) { | |
61 | Device *d = DEVICE(u); | |
62 | ||
63 | assert(d); | |
64 | assert(d->state == DEVICE_DEAD); | |
65 | ||
66 | if (d->sysfs) | |
67 | device_set_state(d, DEVICE_AVAILABLE); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static void device_dump(Unit *u, FILE *f, const char *prefix) { | |
25ac040b | 73 | Device *d = DEVICE(u); |
5cb5a6ff | 74 | |
25ac040b | 75 | assert(d); |
5cb5a6ff LP |
76 | |
77 | fprintf(f, | |
25ac040b LP |
78 | "%sDevice State: %s\n" |
79 | "%sSysfs Path: %s\n", | |
f50e0a01 LP |
80 | prefix, state_string_table[d->state], |
81 | prefix, strna(d->sysfs)); | |
82 | } | |
83 | ||
84 | static UnitActiveState device_active_state(Unit *u) { | |
85 | assert(u); | |
86 | ||
87 | return state_translation_table[DEVICE(u)->state]; | |
25ac040b LP |
88 | } |
89 | ||
b08d03ff | 90 | static int device_add_escaped_name(Unit *u, const char *prefix, const char *dn, bool make_id) { |
25ac040b LP |
91 | char *e; |
92 | int r; | |
93 | ||
94 | assert(u); | |
95 | assert(dn); | |
96 | assert(dn[0] == '/'); | |
97 | ||
b08d03ff | 98 | if (!(e = unit_name_escape_path(prefix, dn+1, ".device"))) |
25ac040b LP |
99 | return -ENOMEM; |
100 | ||
101 | r = unit_add_name(u, e); | |
b08d03ff LP |
102 | |
103 | if (r >= 0 && make_id) | |
104 | unit_choose_id(u, e); | |
105 | ||
25ac040b LP |
106 | free(e); |
107 | ||
108 | if (r < 0 && r != -EEXIST) | |
109 | return r; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
f94ea366 | 114 | static int device_process_new_device(Manager *m, struct udev_device *dev, bool update_state) { |
25ac040b LP |
115 | const char *dn, *names, *wants, *sysfs; |
116 | Unit *u = NULL; | |
117 | int r; | |
118 | char *e, *w, *state; | |
119 | size_t l; | |
120 | bool delete; | |
121 | struct udev_list_entry *item = NULL, *first = NULL; | |
122 | ||
123 | assert(m); | |
124 | ||
125 | /* Check whether this entry is even relevant for us. */ | |
126 | dn = udev_device_get_devnode(dev); | |
127 | names = udev_device_get_property_value(dev, "SYSTEMD_NAMES"); | |
128 | wants = udev_device_get_property_value(dev, "SYSTEMD_WANTS"); | |
129 | ||
130 | if (!dn && !names && !wants) | |
131 | return 0; | |
132 | ||
133 | /* Ok, seems kinda interesting. Now, let's see if this one | |
134 | * already exists. */ | |
135 | ||
136 | if (!(sysfs = udev_device_get_syspath(dev))) | |
137 | return -ENOMEM; | |
138 | ||
139 | assert(sysfs[0] == '/'); | |
b08d03ff | 140 | if (!(e = unit_name_escape_path("sysfs-", sysfs+1, ".device"))) |
25ac040b LP |
141 | return -ENOMEM; |
142 | ||
143 | if (!(u = manager_get_unit(m, e))) { | |
144 | const char *model; | |
145 | ||
146 | delete = true; | |
147 | ||
148 | if (!(u = unit_new(m))) { | |
149 | free(e); | |
150 | return -ENOMEM; | |
151 | } | |
152 | ||
153 | r = unit_add_name(u, e); | |
154 | free(e); | |
155 | ||
156 | if (r < 0) | |
157 | goto fail; | |
158 | ||
159 | if (!(DEVICE(u)->sysfs = strdup(sysfs))) { | |
160 | r = -ENOMEM; | |
161 | goto fail; | |
162 | } | |
163 | ||
164 | if ((model = udev_device_get_property_value(dev, "ID_MODEL_FROM_DATABASE")) || | |
f50e0a01 LP |
165 | (model = udev_device_get_property_value(dev, "ID_MODEL"))) |
166 | if ((r = unit_set_description(u, model)) < 0) | |
25ac040b | 167 | goto fail; |
25ac040b | 168 | |
f94ea366 | 169 | unit_add_to_load_queue(u); |
25ac040b LP |
170 | } else { |
171 | delete = false; | |
172 | free(e); | |
173 | } | |
174 | ||
175 | if (dn) | |
b08d03ff | 176 | if ((r = device_add_escaped_name(u, "node-", dn, true)) < 0) |
25ac040b LP |
177 | goto fail; |
178 | ||
179 | first = udev_device_get_devlinks_list_entry(dev); | |
180 | udev_list_entry_foreach(item, first) | |
b08d03ff | 181 | if ((r = device_add_escaped_name(u, "node-", udev_list_entry_get_name(item), false)) < 0) |
25ac040b LP |
182 | goto fail; |
183 | ||
184 | if (names) { | |
185 | FOREACH_WORD(w, l, names, state) { | |
186 | if (!(e = strndup(w, l))) | |
187 | goto fail; | |
188 | ||
189 | r = unit_add_name(u, e); | |
190 | free(e); | |
191 | ||
192 | if (r < 0 && r != -EEXIST) | |
193 | goto fail; | |
194 | } | |
195 | } | |
196 | ||
25ac040b LP |
197 | if (wants) { |
198 | FOREACH_WORD(w, l, wants, state) { | |
199 | if (!(e = strndup(w, l))) | |
200 | goto fail; | |
201 | ||
202 | r = unit_add_dependency_by_name(u, UNIT_WANTS, e); | |
203 | free(e); | |
204 | ||
205 | if (r < 0) | |
206 | goto fail; | |
207 | } | |
208 | } | |
209 | ||
f94ea366 LP |
210 | if (update_state) { |
211 | manager_dispatch_load_queue(u->meta.manager); | |
212 | device_set_state(DEVICE(u), DEVICE_AVAILABLE); | |
213 | } | |
214 | ||
25ac040b LP |
215 | return 0; |
216 | ||
217 | fail: | |
218 | if (delete && u) | |
219 | unit_free(u); | |
220 | return r; | |
221 | } | |
222 | ||
f94ea366 | 223 | static int device_process_path(Manager *m, const char *path, bool update_state) { |
25ac040b LP |
224 | int r; |
225 | struct udev_device *dev; | |
226 | ||
227 | assert(m); | |
228 | assert(path); | |
229 | ||
230 | if (!(dev = udev_device_new_from_syspath(m->udev, path))) { | |
231 | log_warning("Failed to get udev device object from udev for path %s.", path); | |
232 | return -ENOMEM; | |
233 | } | |
234 | ||
f94ea366 | 235 | r = device_process_new_device(m, dev, update_state); |
25ac040b LP |
236 | udev_device_unref(dev); |
237 | return r; | |
238 | } | |
239 | ||
f94ea366 LP |
240 | static int device_process_removed_device(Manager *m, struct udev_device *dev) { |
241 | const char *sysfs; | |
242 | char *e; | |
243 | Unit *u; | |
244 | Device *d; | |
245 | ||
246 | assert(m); | |
247 | assert(dev); | |
248 | ||
249 | if (!(sysfs = udev_device_get_syspath(dev))) | |
250 | return -ENOMEM; | |
251 | ||
252 | assert(sysfs[0] == '/'); | |
253 | if (!(e = unit_name_escape_path("sysfs-", sysfs+1, ".device"))) | |
254 | return -ENOMEM; | |
255 | ||
256 | u = manager_get_unit(m, e); | |
257 | free(e); | |
258 | ||
259 | if (!u) | |
260 | return 0; | |
261 | ||
262 | d = DEVICE(u); | |
263 | free(d->sysfs); | |
264 | d->sysfs = NULL; | |
265 | ||
266 | device_set_state(d, DEVICE_DEAD); | |
267 | return 0; | |
268 | } | |
269 | ||
25ac040b LP |
270 | static void device_shutdown(Manager *m) { |
271 | assert(m); | |
272 | ||
f94ea366 LP |
273 | if (m->udev_monitor) |
274 | udev_monitor_unref(m->udev_monitor); | |
275 | ||
25ac040b LP |
276 | if (m->udev) |
277 | udev_unref(m->udev); | |
278 | } | |
279 | ||
280 | static int device_enumerate(Manager *m) { | |
f94ea366 | 281 | struct epoll_event ev; |
25ac040b LP |
282 | int r; |
283 | struct udev_enumerate *e = NULL; | |
284 | struct udev_list_entry *item = NULL, *first = NULL; | |
285 | ||
286 | assert(m); | |
287 | ||
288 | if (!(m->udev = udev_new())) | |
289 | return -ENOMEM; | |
290 | ||
f94ea366 LP |
291 | if (!(m->udev_monitor = udev_monitor_new_from_netlink(m->udev, "udev"))) { |
292 | r = -ENOMEM; | |
293 | goto fail; | |
294 | } | |
295 | ||
296 | if (udev_monitor_enable_receiving(m->udev_monitor) < 0) { | |
297 | r = -EIO; | |
298 | goto fail; | |
299 | } | |
300 | ||
301 | m->udev_watch.type = WATCH_UDEV; | |
302 | m->udev_watch.fd = udev_monitor_get_fd(m->udev_monitor); | |
303 | ||
304 | zero(ev); | |
305 | ev.events = EPOLLIN; | |
306 | ev.data.ptr = &m->udev_watch; | |
307 | ||
308 | if (epoll_ctl(m->epoll_fd, EPOLL_CTL_ADD, m->udev_watch.fd, &ev) < 0) | |
309 | return -errno; | |
310 | ||
25ac040b LP |
311 | if (!(e = udev_enumerate_new(m->udev))) { |
312 | r = -ENOMEM; | |
313 | goto fail; | |
314 | } | |
315 | ||
316 | if (udev_enumerate_scan_devices(e) < 0) { | |
317 | r = -EIO; | |
318 | goto fail; | |
319 | } | |
320 | ||
321 | first = udev_enumerate_get_list_entry(e); | |
322 | udev_list_entry_foreach(item, first) | |
f94ea366 | 323 | device_process_path(m, udev_list_entry_get_name(item), false); |
25ac040b LP |
324 | |
325 | udev_enumerate_unref(e); | |
25ac040b LP |
326 | return 0; |
327 | ||
328 | fail: | |
329 | if (e) | |
330 | udev_enumerate_unref(e); | |
331 | ||
332 | device_shutdown(m); | |
333 | return r; | |
5cb5a6ff LP |
334 | } |
335 | ||
f94ea366 LP |
336 | void device_fd_event(Manager *m, int events) { |
337 | struct udev_device *dev; | |
338 | int r; | |
339 | const char *action; | |
340 | ||
341 | assert(m); | |
342 | assert(events == EPOLLIN); | |
343 | ||
344 | log_debug("got udev event"); | |
345 | ||
346 | if (!(dev = udev_monitor_receive_device(m->udev_monitor))) { | |
347 | log_error("Failed to receive device."); | |
348 | return; | |
349 | } | |
350 | ||
351 | if (!(action = udev_device_get_action(dev))) { | |
352 | log_error("Failed to get udev action string."); | |
353 | goto fail; | |
354 | } | |
355 | ||
356 | if (streq(action, "remove")) { | |
357 | if ((r = device_process_removed_device(m, dev)) < 0) { | |
358 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
359 | goto fail; | |
360 | } | |
361 | } else { | |
362 | if ((r = device_process_new_device(m, dev, true)) < 0) { | |
363 | log_error("Failed to process udev device event: %s", strerror(-r)); | |
364 | goto fail; | |
365 | } | |
366 | } | |
367 | ||
368 | fail: | |
369 | udev_device_unref(dev); | |
370 | } | |
371 | ||
87f0e418 | 372 | const UnitVTable device_vtable = { |
5cb5a6ff LP |
373 | .suffix = ".device", |
374 | ||
87f0e418 | 375 | .init = unit_load_fragment_and_dropin, |
034c6ed7 | 376 | .done = device_done, |
f50e0a01 LP |
377 | .coldplug = device_coldplug, |
378 | ||
5cb5a6ff LP |
379 | .dump = device_dump, |
380 | ||
f50e0a01 | 381 | .active_state = device_active_state, |
25ac040b | 382 | |
f50e0a01 LP |
383 | .enumerate = device_enumerate, |
384 | .shutdown = device_shutdown | |
5cb5a6ff | 385 | }; |