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Commit | Line | Data |
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7fafc032 | 1 | /* |
1298001e | 2 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
2f6cbd19 | 3 | * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> |
bb38678e SJR |
4 | * Copyright (C) 2009 Canonical Ltd. |
5 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 | 6 | * |
55e9959b KS |
7 | * This program is free software: you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 2 of the License, or | |
10 | * (at your option) any later version. | |
7fafc032 | 11 | * |
55e9959b KS |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
7fafc032 | 16 | * |
55e9959b KS |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
7fafc032 KS |
19 | */ |
20 | ||
a695feae | 21 | #include <stddef.h> |
7fafc032 KS |
22 | #include <signal.h> |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
c3804728 | 27 | #include <stdbool.h> |
7fafc032 | 28 | #include <string.h> |
085cce37 | 29 | #include <ctype.h> |
085cce37 | 30 | #include <fcntl.h> |
0b3dfb3d | 31 | #include <time.h> |
b52a01ee | 32 | #include <getopt.h> |
78230c0d | 33 | #include <dirent.h> |
820fc48f | 34 | #include <sys/time.h> |
1e03b754 KS |
35 | #include <sys/prctl.h> |
36 | #include <sys/socket.h> | |
a65aa40f | 37 | #include <sys/un.h> |
1e03b754 | 38 | #include <sys/signalfd.h> |
ff2c503d | 39 | #include <sys/epoll.h> |
3210a72b | 40 | #include <sys/poll.h> |
138068d6 | 41 | #include <sys/wait.h> |
dc117daa | 42 | #include <sys/stat.h> |
c895fd00 | 43 | #include <sys/ioctl.h> |
01618658 | 44 | #include <sys/inotify.h> |
761dfddc | 45 | #include <sys/utsname.h> |
7fafc032 KS |
46 | |
47 | #include "udev.h" | |
392ef7a2 | 48 | #include "sd-daemon.h" |
194bbe33 | 49 | #include "cgroup-util.h" |
5ba2dc25 | 50 | #include "dev-setup.h" |
7fafc032 | 51 | |
c3804728 | 52 | static bool debug; |
9e8fe79b | 53 | |
80df994c | 54 | void udev_main_log(struct udev *udev, int priority, |
912541b0 KS |
55 | const char *file, int line, const char *fn, |
56 | const char *format, va_list args) | |
7d563a17 | 57 | { |
baa30fbc | 58 | log_metav(priority, file, line, fn, format, args); |
7d563a17 KS |
59 | } |
60 | ||
d7ddce18 | 61 | static struct udev_rules *rules; |
f503f6b2 | 62 | static struct udev_queue_export *udev_queue_export; |
d59f11e1 | 63 | static struct udev_ctrl *udev_ctrl; |
1e03b754 | 64 | static struct udev_monitor *monitor; |
3c6ee190 | 65 | static int worker_watch[2] = { -1, -1 }; |
ff2c503d KS |
66 | static int fd_signal = -1; |
67 | static int fd_ep = -1; | |
68 | static int fd_inotify = -1; | |
c3804728 | 69 | static bool stop_exec_queue; |
7c85d636 | 70 | static bool reload; |
87d55ff6 KS |
71 | static int children; |
72 | static int children_max; | |
c830e98d | 73 | static int exec_delay; |
2181d30a | 74 | static sigset_t sigmask_orig; |
ff2c503d KS |
75 | static UDEV_LIST(event_list); |
76 | static UDEV_LIST(worker_list); | |
194bbe33 | 77 | char *udev_cgroup; |
c3804728 | 78 | static bool udev_exit; |
1e03b754 | 79 | |
1e03b754 | 80 | enum event_state { |
912541b0 KS |
81 | EVENT_UNDEF, |
82 | EVENT_QUEUED, | |
83 | EVENT_RUNNING, | |
1e03b754 KS |
84 | }; |
85 | ||
86 | struct event { | |
912541b0 KS |
87 | struct udev_list_node node; |
88 | struct udev *udev; | |
89 | struct udev_device *dev; | |
90 | enum event_state state; | |
91 | int exitcode; | |
92 | unsigned long long int delaying_seqnum; | |
93 | unsigned long long int seqnum; | |
94 | const char *devpath; | |
95 | size_t devpath_len; | |
96 | const char *devpath_old; | |
97 | dev_t devnum; | |
912541b0 | 98 | int ifindex; |
ea6039a3 KS |
99 | bool is_block; |
100 | bool nodelay; | |
1e03b754 KS |
101 | }; |
102 | ||
b27ee00b | 103 | static inline struct event *node_to_event(struct udev_list_node *node) |
7e027927 | 104 | { |
b27ee00b | 105 | return container_of(node, struct event, node); |
1e03b754 KS |
106 | } |
107 | ||
ff2c503d KS |
108 | static void event_queue_cleanup(struct udev *udev, enum event_state type); |
109 | ||
1e03b754 | 110 | enum worker_state { |
912541b0 KS |
111 | WORKER_UNDEF, |
112 | WORKER_RUNNING, | |
113 | WORKER_IDLE, | |
114 | WORKER_KILLED, | |
1e03b754 KS |
115 | }; |
116 | ||
117 | struct worker { | |
912541b0 KS |
118 | struct udev_list_node node; |
119 | struct udev *udev; | |
120 | int refcount; | |
121 | pid_t pid; | |
122 | struct udev_monitor *monitor; | |
123 | enum worker_state state; | |
124 | struct event *event; | |
40fe8b11 | 125 | usec_t event_start_usec; |
1e03b754 KS |
126 | }; |
127 | ||
128 | /* passed from worker to main process */ | |
129 | struct worker_message { | |
912541b0 KS |
130 | pid_t pid; |
131 | int exitcode; | |
1e03b754 KS |
132 | }; |
133 | ||
b27ee00b | 134 | static inline struct worker *node_to_worker(struct udev_list_node *node) |
1e03b754 | 135 | { |
b27ee00b | 136 | return container_of(node, struct worker, node); |
7e027927 KS |
137 | } |
138 | ||
ff2c503d | 139 | static void event_queue_delete(struct event *event, bool export) |
fc465079 | 140 | { |
912541b0 KS |
141 | udev_list_node_remove(&event->node); |
142 | ||
143 | if (export) { | |
144 | udev_queue_export_device_finished(udev_queue_export, event->dev); | |
baa30fbc | 145 | log_debug("seq %llu done with %i\n", udev_device_get_seqnum(event->dev), event->exitcode); |
912541b0 KS |
146 | } |
147 | udev_device_unref(event->dev); | |
148 | free(event); | |
aa8734ff | 149 | } |
7a770250 | 150 | |
bc113de9 KS |
151 | static struct worker *worker_ref(struct worker *worker) |
152 | { | |
912541b0 KS |
153 | worker->refcount++; |
154 | return worker; | |
bc113de9 KS |
155 | } |
156 | ||
ff2c503d KS |
157 | static void worker_cleanup(struct worker *worker) |
158 | { | |
912541b0 KS |
159 | udev_list_node_remove(&worker->node); |
160 | udev_monitor_unref(worker->monitor); | |
161 | children--; | |
162 | free(worker); | |
ff2c503d KS |
163 | } |
164 | ||
1e03b754 KS |
165 | static void worker_unref(struct worker *worker) |
166 | { | |
912541b0 KS |
167 | worker->refcount--; |
168 | if (worker->refcount > 0) | |
169 | return; | |
baa30fbc | 170 | log_debug("worker [%u] cleaned up\n", worker->pid); |
912541b0 | 171 | worker_cleanup(worker); |
ff2c503d KS |
172 | } |
173 | ||
174 | static void worker_list_cleanup(struct udev *udev) | |
175 | { | |
912541b0 | 176 | struct udev_list_node *loop, *tmp; |
ff2c503d | 177 | |
912541b0 KS |
178 | udev_list_node_foreach_safe(loop, tmp, &worker_list) { |
179 | struct worker *worker = node_to_worker(loop); | |
ff2c503d | 180 | |
912541b0 KS |
181 | worker_cleanup(worker); |
182 | } | |
fc465079 KS |
183 | } |
184 | ||
1e03b754 | 185 | static void worker_new(struct event *event) |
7fafc032 | 186 | { |
912541b0 KS |
187 | struct udev *udev = event->udev; |
188 | struct worker *worker; | |
189 | struct udev_monitor *worker_monitor; | |
190 | pid_t pid; | |
191 | ||
192 | /* listen for new events */ | |
193 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
194 | if (worker_monitor == NULL) | |
195 | return; | |
196 | /* allow the main daemon netlink address to send devices to the worker */ | |
197 | udev_monitor_allow_unicast_sender(worker_monitor, monitor); | |
198 | udev_monitor_enable_receiving(worker_monitor); | |
199 | ||
200 | worker = calloc(1, sizeof(struct worker)); | |
201 | if (worker == NULL) { | |
202 | udev_monitor_unref(worker_monitor); | |
203 | return; | |
204 | } | |
205 | /* worker + event reference */ | |
206 | worker->refcount = 2; | |
207 | worker->udev = udev; | |
208 | ||
209 | pid = fork(); | |
210 | switch (pid) { | |
211 | case 0: { | |
212 | struct udev_device *dev = NULL; | |
213 | int fd_monitor; | |
214 | struct epoll_event ep_signal, ep_monitor; | |
215 | sigset_t mask; | |
216 | int rc = EXIT_SUCCESS; | |
217 | ||
43095991 | 218 | /* take initial device from queue */ |
912541b0 KS |
219 | dev = event->dev; |
220 | event->dev = NULL; | |
221 | ||
222 | free(worker); | |
223 | worker_list_cleanup(udev); | |
224 | event_queue_cleanup(udev, EVENT_UNDEF); | |
225 | udev_queue_export_unref(udev_queue_export); | |
226 | udev_monitor_unref(monitor); | |
227 | udev_ctrl_unref(udev_ctrl); | |
228 | close(fd_signal); | |
229 | close(fd_ep); | |
230 | close(worker_watch[READ_END]); | |
231 | ||
232 | sigfillset(&mask); | |
233 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
234 | if (fd_signal < 0) { | |
baa30fbc | 235 | log_error("error creating signalfd %m\n"); |
912541b0 KS |
236 | rc = 2; |
237 | goto out; | |
238 | } | |
239 | ||
240 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
241 | if (fd_ep < 0) { | |
baa30fbc | 242 | log_error("error creating epoll fd: %m\n"); |
912541b0 KS |
243 | rc = 3; |
244 | goto out; | |
245 | } | |
246 | ||
247 | memset(&ep_signal, 0, sizeof(struct epoll_event)); | |
248 | ep_signal.events = EPOLLIN; | |
249 | ep_signal.data.fd = fd_signal; | |
250 | ||
251 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
252 | memset(&ep_monitor, 0, sizeof(struct epoll_event)); | |
253 | ep_monitor.events = EPOLLIN; | |
254 | ep_monitor.data.fd = fd_monitor; | |
255 | ||
256 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || | |
257 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
baa30fbc | 258 | log_error("fail to add fds to epoll: %m\n"); |
912541b0 KS |
259 | rc = 4; |
260 | goto out; | |
261 | } | |
262 | ||
263 | /* request TERM signal if parent exits */ | |
264 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
265 | ||
145dae7e KS |
266 | /* reset OOM score, we only protect the main daemon */ |
267 | write_one_line_file("/proc/self/oom_score_adj", "0"); | |
268 | ||
912541b0 KS |
269 | for (;;) { |
270 | struct udev_event *udev_event; | |
271 | struct worker_message msg; | |
272 | int err; | |
273 | ||
baa30fbc | 274 | log_debug("seq %llu running\n", udev_device_get_seqnum(dev)); |
912541b0 KS |
275 | udev_event = udev_event_new(dev); |
276 | if (udev_event == NULL) { | |
277 | rc = 5; | |
278 | goto out; | |
279 | } | |
280 | ||
281 | /* needed for SIGCHLD/SIGTERM in spawn() */ | |
282 | udev_event->fd_signal = fd_signal; | |
283 | ||
284 | if (exec_delay > 0) | |
285 | udev_event->exec_delay = exec_delay; | |
286 | ||
287 | /* apply rules, create node, symlinks */ | |
288 | err = udev_event_execute_rules(udev_event, rules, &sigmask_orig); | |
289 | ||
290 | if (err == 0) | |
291 | udev_event_execute_run(udev_event, &sigmask_orig); | |
292 | ||
293 | /* apply/restore inotify watch */ | |
294 | if (err == 0 && udev_event->inotify_watch) { | |
295 | udev_watch_begin(udev, dev); | |
296 | udev_device_update_db(dev); | |
297 | } | |
298 | ||
299 | /* send processed event back to libudev listeners */ | |
300 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
301 | ||
302 | /* send udevd the result of the event execution */ | |
303 | memset(&msg, 0, sizeof(struct worker_message)); | |
304 | if (err != 0) | |
305 | msg.exitcode = err; | |
306 | msg.pid = getpid(); | |
307 | send(worker_watch[WRITE_END], &msg, sizeof(struct worker_message), 0); | |
308 | ||
baa30fbc | 309 | log_debug("seq %llu processed with %i\n", udev_device_get_seqnum(dev), err); |
912541b0 KS |
310 | |
311 | udev_device_unref(dev); | |
312 | dev = NULL; | |
313 | ||
314 | if (udev_event->sigterm) { | |
315 | udev_event_unref(udev_event); | |
316 | goto out; | |
317 | } | |
318 | ||
319 | udev_event_unref(udev_event); | |
320 | ||
321 | /* wait for more device messages from main udevd, or term signal */ | |
322 | while (dev == NULL) { | |
323 | struct epoll_event ev[4]; | |
324 | int fdcount; | |
325 | int i; | |
326 | ||
8fef0ff2 | 327 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
328 | if (fdcount < 0) { |
329 | if (errno == EINTR) | |
330 | continue; | |
baa30fbc | 331 | log_error("failed to poll: %m\n"); |
912541b0 KS |
332 | goto out; |
333 | } | |
334 | ||
335 | for (i = 0; i < fdcount; i++) { | |
336 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
337 | dev = udev_monitor_receive_device(worker_monitor); | |
338 | break; | |
339 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
340 | struct signalfd_siginfo fdsi; | |
341 | ssize_t size; | |
342 | ||
343 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
344 | if (size != sizeof(struct signalfd_siginfo)) | |
345 | continue; | |
346 | switch (fdsi.ssi_signo) { | |
347 | case SIGTERM: | |
348 | goto out; | |
349 | } | |
350 | } | |
351 | } | |
352 | } | |
353 | } | |
82063a88 | 354 | out: |
912541b0 KS |
355 | udev_device_unref(dev); |
356 | if (fd_signal >= 0) | |
357 | close(fd_signal); | |
358 | if (fd_ep >= 0) | |
359 | close(fd_ep); | |
360 | close(fd_inotify); | |
361 | close(worker_watch[WRITE_END]); | |
362 | udev_rules_unref(rules); | |
e64fae55 | 363 | udev_builtin_exit(udev); |
912541b0 KS |
364 | udev_monitor_unref(worker_monitor); |
365 | udev_unref(udev); | |
baa30fbc | 366 | log_close(); |
912541b0 KS |
367 | exit(rc); |
368 | } | |
369 | case -1: | |
370 | udev_monitor_unref(worker_monitor); | |
371 | event->state = EVENT_QUEUED; | |
372 | free(worker); | |
baa30fbc | 373 | log_error("fork of child failed: %m\n"); |
912541b0 KS |
374 | break; |
375 | default: | |
376 | /* close monitor, but keep address around */ | |
377 | udev_monitor_disconnect(worker_monitor); | |
378 | worker->monitor = worker_monitor; | |
379 | worker->pid = pid; | |
380 | worker->state = WORKER_RUNNING; | |
40fe8b11 | 381 | worker->event_start_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
382 | worker->event = event; |
383 | event->state = EVENT_RUNNING; | |
384 | udev_list_node_append(&worker->node, &worker_list); | |
385 | children++; | |
baa30fbc | 386 | log_debug("seq %llu forked new worker [%u]\n", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
387 | break; |
388 | } | |
7fafc032 KS |
389 | } |
390 | ||
57c6f8ae | 391 | static void event_run(struct event *event) |
fc465079 | 392 | { |
912541b0 KS |
393 | struct udev_list_node *loop; |
394 | ||
395 | udev_list_node_foreach(loop, &worker_list) { | |
396 | struct worker *worker = node_to_worker(loop); | |
397 | ssize_t count; | |
398 | ||
399 | if (worker->state != WORKER_IDLE) | |
400 | continue; | |
401 | ||
402 | count = udev_monitor_send_device(monitor, worker->monitor, event->dev); | |
403 | if (count < 0) { | |
baa30fbc | 404 | log_error("worker [%u] did not accept message %zi (%m), kill it\n", worker->pid, count); |
912541b0 KS |
405 | kill(worker->pid, SIGKILL); |
406 | worker->state = WORKER_KILLED; | |
407 | continue; | |
408 | } | |
409 | worker_ref(worker); | |
410 | worker->event = event; | |
411 | worker->state = WORKER_RUNNING; | |
40fe8b11 | 412 | worker->event_start_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
413 | event->state = EVENT_RUNNING; |
414 | return; | |
415 | } | |
416 | ||
417 | if (children >= children_max) { | |
418 | if (children_max > 1) | |
baa30fbc | 419 | log_debug("maximum number (%i) of children reached\n", children); |
912541b0 KS |
420 | return; |
421 | } | |
422 | ||
423 | /* start new worker and pass initial device */ | |
424 | worker_new(event); | |
1e03b754 KS |
425 | } |
426 | ||
40929a02 | 427 | static int event_queue_insert(struct udev_device *dev) |
1e03b754 | 428 | { |
912541b0 KS |
429 | struct event *event; |
430 | ||
431 | event = calloc(1, sizeof(struct event)); | |
432 | if (event == NULL) | |
433 | return -1; | |
434 | ||
435 | event->udev = udev_device_get_udev(dev); | |
436 | event->dev = dev; | |
437 | event->seqnum = udev_device_get_seqnum(dev); | |
438 | event->devpath = udev_device_get_devpath(dev); | |
439 | event->devpath_len = strlen(event->devpath); | |
440 | event->devpath_old = udev_device_get_devpath_old(dev); | |
441 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 442 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 | 443 | event->ifindex = udev_device_get_ifindex(dev); |
ea6039a3 KS |
444 | if (streq(udev_device_get_subsystem(dev), "firmware")) |
445 | event->nodelay = true; | |
912541b0 KS |
446 | |
447 | udev_queue_export_device_queued(udev_queue_export, dev); | |
baa30fbc | 448 | log_debug("seq %llu queued, '%s' '%s'\n", udev_device_get_seqnum(dev), |
912541b0 KS |
449 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
450 | ||
451 | event->state = EVENT_QUEUED; | |
452 | udev_list_node_append(&event->node, &event_list); | |
453 | return 0; | |
fc465079 KS |
454 | } |
455 | ||
194bbe33 | 456 | static void worker_kill(struct udev *udev) |
1e03b754 | 457 | { |
912541b0 | 458 | struct udev_list_node *loop; |
1e03b754 | 459 | |
912541b0 KS |
460 | udev_list_node_foreach(loop, &worker_list) { |
461 | struct worker *worker = node_to_worker(loop); | |
1e03b754 | 462 | |
912541b0 KS |
463 | if (worker->state == WORKER_KILLED) |
464 | continue; | |
1e03b754 | 465 | |
912541b0 KS |
466 | worker->state = WORKER_KILLED; |
467 | kill(worker->pid, SIGTERM); | |
468 | } | |
1e03b754 KS |
469 | } |
470 | ||
e3196993 | 471 | /* lookup event for identical, parent, child device */ |
19711e19 | 472 | static bool is_devpath_busy(struct event *event) |
7fafc032 | 473 | { |
912541b0 KS |
474 | struct udev_list_node *loop; |
475 | size_t common; | |
476 | ||
477 | /* check if queue contains events we depend on */ | |
478 | udev_list_node_foreach(loop, &event_list) { | |
479 | struct event *loop_event = node_to_event(loop); | |
480 | ||
481 | /* we already found a later event, earlier can not block us, no need to check again */ | |
482 | if (loop_event->seqnum < event->delaying_seqnum) | |
483 | continue; | |
484 | ||
485 | /* event we checked earlier still exists, no need to check again */ | |
486 | if (loop_event->seqnum == event->delaying_seqnum) | |
487 | return true; | |
488 | ||
489 | /* found ourself, no later event can block us */ | |
490 | if (loop_event->seqnum >= event->seqnum) | |
491 | break; | |
492 | ||
493 | /* check major/minor */ | |
494 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
495 | return true; | |
496 | ||
497 | /* check network device ifindex */ | |
498 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
499 | return true; | |
500 | ||
501 | /* check our old name */ | |
090be865 | 502 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
503 | event->delaying_seqnum = loop_event->seqnum; |
504 | return true; | |
505 | } | |
506 | ||
507 | /* compare devpath */ | |
508 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
509 | ||
510 | /* one devpath is contained in the other? */ | |
511 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
512 | continue; | |
513 | ||
514 | /* identical device event found */ | |
515 | if (loop_event->devpath_len == event->devpath_len) { | |
516 | /* devices names might have changed/swapped in the meantime */ | |
517 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
518 | continue; | |
519 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
520 | continue; | |
521 | event->delaying_seqnum = loop_event->seqnum; | |
522 | return true; | |
523 | } | |
524 | ||
ea6039a3 KS |
525 | /* allow to bypass the dependency tracking */ |
526 | if (event->nodelay) | |
527 | continue; | |
528 | ||
912541b0 KS |
529 | /* parent device event found */ |
530 | if (event->devpath[common] == '/') { | |
531 | event->delaying_seqnum = loop_event->seqnum; | |
532 | return true; | |
533 | } | |
534 | ||
535 | /* child device event found */ | |
536 | if (loop_event->devpath[common] == '/') { | |
537 | event->delaying_seqnum = loop_event->seqnum; | |
538 | return true; | |
539 | } | |
540 | ||
541 | /* no matching device */ | |
542 | continue; | |
543 | } | |
544 | ||
545 | return false; | |
7fafc032 KS |
546 | } |
547 | ||
ff2c503d | 548 | static void event_queue_start(struct udev *udev) |
7fafc032 | 549 | { |
912541b0 | 550 | struct udev_list_node *loop; |
8ab44e3f | 551 | |
912541b0 KS |
552 | udev_list_node_foreach(loop, &event_list) { |
553 | struct event *event = node_to_event(loop); | |
0bc74ea7 | 554 | |
912541b0 KS |
555 | if (event->state != EVENT_QUEUED) |
556 | continue; | |
0bc74ea7 | 557 | |
912541b0 | 558 | /* do not start event if parent or child event is still running */ |
baa30fbc | 559 | if (is_devpath_busy(event)) |
912541b0 | 560 | continue; |
fc465079 | 561 | |
912541b0 KS |
562 | event_run(event); |
563 | } | |
1e03b754 KS |
564 | } |
565 | ||
ff2c503d KS |
566 | static void event_queue_cleanup(struct udev *udev, enum event_state match_type) |
567 | { | |
912541b0 | 568 | struct udev_list_node *loop, *tmp; |
ff2c503d | 569 | |
912541b0 KS |
570 | udev_list_node_foreach_safe(loop, tmp, &event_list) { |
571 | struct event *event = node_to_event(loop); | |
ff2c503d | 572 | |
912541b0 KS |
573 | if (match_type != EVENT_UNDEF && match_type != event->state) |
574 | continue; | |
ff2c503d | 575 | |
912541b0 KS |
576 | event_queue_delete(event, false); |
577 | } | |
ff2c503d KS |
578 | } |
579 | ||
580 | static void worker_returned(int fd_worker) | |
1e03b754 | 581 | { |
912541b0 KS |
582 | for (;;) { |
583 | struct worker_message msg; | |
584 | ssize_t size; | |
585 | struct udev_list_node *loop; | |
586 | ||
587 | size = recv(fd_worker, &msg, sizeof(struct worker_message), MSG_DONTWAIT); | |
588 | if (size != sizeof(struct worker_message)) | |
589 | break; | |
590 | ||
591 | /* lookup worker who sent the signal */ | |
592 | udev_list_node_foreach(loop, &worker_list) { | |
593 | struct worker *worker = node_to_worker(loop); | |
594 | ||
595 | if (worker->pid != msg.pid) | |
596 | continue; | |
597 | ||
598 | /* worker returned */ | |
e64fae55 KS |
599 | if (worker->event) { |
600 | worker->event->exitcode = msg.exitcode; | |
601 | event_queue_delete(worker->event, true); | |
602 | worker->event = NULL; | |
603 | } | |
912541b0 KS |
604 | if (worker->state != WORKER_KILLED) |
605 | worker->state = WORKER_IDLE; | |
606 | worker_unref(worker); | |
607 | break; | |
608 | } | |
609 | } | |
88f4b648 KS |
610 | } |
611 | ||
3b47c739 | 612 | /* receive the udevd message from userspace */ |
ff2c503d | 613 | static struct udev_ctrl_connection *handle_ctrl_msg(struct udev_ctrl *uctrl) |
7fafc032 | 614 | { |
912541b0 KS |
615 | struct udev *udev = udev_ctrl_get_udev(uctrl); |
616 | struct udev_ctrl_connection *ctrl_conn; | |
617 | struct udev_ctrl_msg *ctrl_msg = NULL; | |
618 | const char *str; | |
619 | int i; | |
620 | ||
621 | ctrl_conn = udev_ctrl_get_connection(uctrl); | |
622 | if (ctrl_conn == NULL) | |
623 | goto out; | |
624 | ||
625 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
626 | if (ctrl_msg == NULL) | |
627 | goto out; | |
628 | ||
629 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
630 | if (i >= 0) { | |
baa30fbc KS |
631 | log_debug("udevd message (SET_LOG_PRIORITY) received, log_priority=%i\n", i); |
632 | log_set_max_level(i); | |
912541b0 | 633 | udev_set_log_priority(udev, i); |
194bbe33 | 634 | worker_kill(udev); |
912541b0 KS |
635 | } |
636 | ||
637 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
baa30fbc | 638 | log_debug("udevd message (STOP_EXEC_QUEUE) received\n"); |
912541b0 KS |
639 | stop_exec_queue = true; |
640 | } | |
641 | ||
642 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
baa30fbc | 643 | log_debug("udevd message (START_EXEC_QUEUE) received\n"); |
912541b0 KS |
644 | stop_exec_queue = false; |
645 | } | |
646 | ||
647 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
baa30fbc | 648 | log_debug("udevd message (RELOAD) received\n"); |
912541b0 KS |
649 | reload = true; |
650 | } | |
651 | ||
652 | str = udev_ctrl_get_set_env(ctrl_msg); | |
653 | if (str != NULL) { | |
654 | char *key; | |
655 | ||
656 | key = strdup(str); | |
657 | if (key != NULL) { | |
658 | char *val; | |
659 | ||
660 | val = strchr(key, '='); | |
661 | if (val != NULL) { | |
662 | val[0] = '\0'; | |
663 | val = &val[1]; | |
664 | if (val[0] == '\0') { | |
baa30fbc | 665 | log_debug("udevd message (ENV) received, unset '%s'\n", key); |
912541b0 KS |
666 | udev_add_property(udev, key, NULL); |
667 | } else { | |
baa30fbc | 668 | log_debug("udevd message (ENV) received, set '%s=%s'\n", key, val); |
912541b0 KS |
669 | udev_add_property(udev, key, val); |
670 | } | |
671 | } else { | |
baa30fbc | 672 | log_error("wrong key format '%s'\n", key); |
912541b0 KS |
673 | } |
674 | free(key); | |
675 | } | |
194bbe33 | 676 | worker_kill(udev); |
912541b0 KS |
677 | } |
678 | ||
679 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
680 | if (i >= 0) { | |
baa30fbc | 681 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i\n", i); |
912541b0 KS |
682 | children_max = i; |
683 | } | |
684 | ||
685 | if (udev_ctrl_get_ping(ctrl_msg) > 0) | |
baa30fbc | 686 | log_debug("udevd message (SYNC) received\n"); |
912541b0 KS |
687 | |
688 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
baa30fbc | 689 | log_debug("udevd message (EXIT) received\n"); |
912541b0 KS |
690 | udev_exit = true; |
691 | /* keep reference to block the client until we exit */ | |
692 | udev_ctrl_connection_ref(ctrl_conn); | |
693 | } | |
ff2c503d | 694 | out: |
912541b0 KS |
695 | udev_ctrl_msg_unref(ctrl_msg); |
696 | return udev_ctrl_connection_unref(ctrl_conn); | |
88f4b648 | 697 | } |
4a231017 | 698 | |
bd284db1 SJR |
699 | /* read inotify messages */ |
700 | static int handle_inotify(struct udev *udev) | |
701 | { | |
912541b0 KS |
702 | int nbytes, pos; |
703 | char *buf; | |
704 | struct inotify_event *ev; | |
705 | ||
706 | if ((ioctl(fd_inotify, FIONREAD, &nbytes) < 0) || (nbytes <= 0)) | |
707 | return 0; | |
708 | ||
709 | buf = malloc(nbytes); | |
710 | if (buf == NULL) { | |
baa30fbc | 711 | log_error("error getting buffer for inotify\n"); |
912541b0 KS |
712 | return -1; |
713 | } | |
714 | ||
715 | nbytes = read(fd_inotify, buf, nbytes); | |
716 | ||
717 | for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) { | |
718 | struct udev_device *dev; | |
719 | ||
720 | ev = (struct inotify_event *)(buf + pos); | |
721 | dev = udev_watch_lookup(udev, ev->wd); | |
722 | if (dev != NULL) { | |
baa30fbc | 723 | log_debug("inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev)); |
912541b0 KS |
724 | if (ev->mask & IN_CLOSE_WRITE) { |
725 | char filename[UTIL_PATH_SIZE]; | |
726 | int fd; | |
727 | ||
baa30fbc | 728 | log_debug("device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev)); |
d5a89d7d | 729 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); |
912541b0 KS |
730 | fd = open(filename, O_WRONLY); |
731 | if (fd >= 0) { | |
732 | if (write(fd, "change", 6) < 0) | |
baa30fbc | 733 | log_debug("error writing uevent: %m\n"); |
912541b0 KS |
734 | close(fd); |
735 | } | |
736 | } | |
737 | if (ev->mask & IN_IGNORED) | |
738 | udev_watch_end(udev, dev); | |
739 | ||
740 | udev_device_unref(dev); | |
741 | } | |
742 | ||
743 | } | |
744 | ||
745 | free(buf); | |
746 | return 0; | |
bd284db1 SJR |
747 | } |
748 | ||
45798927 | 749 | static void handle_signal(struct udev *udev, int signo) |
7fafc032 | 750 | { |
912541b0 KS |
751 | switch (signo) { |
752 | case SIGINT: | |
753 | case SIGTERM: | |
754 | udev_exit = true; | |
755 | break; | |
756 | case SIGCHLD: | |
757 | for (;;) { | |
758 | pid_t pid; | |
759 | int status; | |
760 | struct udev_list_node *loop, *tmp; | |
761 | ||
762 | pid = waitpid(-1, &status, WNOHANG); | |
763 | if (pid <= 0) | |
764 | break; | |
765 | ||
766 | udev_list_node_foreach_safe(loop, tmp, &worker_list) { | |
767 | struct worker *worker = node_to_worker(loop); | |
768 | ||
769 | if (worker->pid != pid) | |
770 | continue; | |
baa30fbc | 771 | log_debug("worker [%u] exit\n", pid); |
912541b0 KS |
772 | |
773 | if (WIFEXITED(status)) { | |
774 | if (WEXITSTATUS(status) != 0) | |
baa30fbc | 775 | log_error("worker [%u] exit with return code %i\n", pid, WEXITSTATUS(status)); |
912541b0 | 776 | } else if (WIFSIGNALED(status)) { |
baa30fbc | 777 | log_error("worker [%u] terminated by signal %i (%s)\n", |
912541b0 KS |
778 | pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
779 | } else if (WIFSTOPPED(status)) { | |
baa30fbc | 780 | log_error("worker [%u] stopped\n", pid); |
912541b0 | 781 | } else if (WIFCONTINUED(status)) { |
baa30fbc | 782 | log_error("worker [%u] continued\n", pid); |
912541b0 | 783 | } else { |
baa30fbc | 784 | log_error("worker [%u] exit with status 0x%04x\n", pid, status); |
912541b0 KS |
785 | } |
786 | ||
787 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
e64fae55 | 788 | if (worker->event) { |
baa30fbc KS |
789 | log_error("worker [%u] failed while handling '%s'\n", |
790 | pid, worker->event->devpath); | |
912541b0 KS |
791 | worker->event->exitcode = -32; |
792 | event_queue_delete(worker->event, true); | |
793 | /* drop reference taken for state 'running' */ | |
794 | worker_unref(worker); | |
795 | } | |
796 | } | |
797 | worker_unref(worker); | |
798 | break; | |
799 | } | |
800 | } | |
801 | break; | |
802 | case SIGHUP: | |
803 | reload = true; | |
804 | break; | |
805 | } | |
f27125f9 | 806 | } |
807 | ||
761dfddc KS |
808 | static void static_dev_create_from_modules(struct udev *udev) |
809 | { | |
912541b0 KS |
810 | struct utsname kernel; |
811 | char modules[UTIL_PATH_SIZE]; | |
812 | char buf[4096]; | |
813 | FILE *f; | |
814 | ||
815 | uname(&kernel); | |
d5a89d7d | 816 | strscpyl(modules, sizeof(modules), ROOTPREFIX "/lib/modules/", kernel.release, "/modules.devname", NULL); |
47ef94ac | 817 | f = fopen(modules, "re"); |
912541b0 KS |
818 | if (f == NULL) |
819 | return; | |
820 | ||
821 | while (fgets(buf, sizeof(buf), f) != NULL) { | |
822 | char *s; | |
823 | const char *modname; | |
824 | const char *devname; | |
825 | const char *devno; | |
826 | int maj, min; | |
827 | char type; | |
828 | mode_t mode; | |
829 | char filename[UTIL_PATH_SIZE]; | |
830 | ||
831 | if (buf[0] == '#') | |
832 | continue; | |
833 | ||
834 | modname = buf; | |
835 | s = strchr(modname, ' '); | |
836 | if (s == NULL) | |
837 | continue; | |
838 | s[0] = '\0'; | |
839 | ||
840 | devname = &s[1]; | |
841 | s = strchr(devname, ' '); | |
842 | if (s == NULL) | |
843 | continue; | |
844 | s[0] = '\0'; | |
845 | ||
846 | devno = &s[1]; | |
847 | s = strchr(devno, ' '); | |
848 | if (s == NULL) | |
849 | s = strchr(devno, '\n'); | |
850 | if (s != NULL) | |
851 | s[0] = '\0'; | |
852 | if (sscanf(devno, "%c%u:%u", &type, &maj, &min) != 3) | |
853 | continue; | |
854 | ||
ef8a2bf6 | 855 | mode = 0600; |
912541b0 | 856 | if (type == 'c') |
ef8a2bf6 | 857 | mode |= S_IFCHR; |
912541b0 | 858 | else if (type == 'b') |
ef8a2bf6 | 859 | mode |= S_IFBLK; |
912541b0 KS |
860 | else |
861 | continue; | |
862 | ||
d5a89d7d | 863 | strscpyl(filename, sizeof(filename), "/dev/", devname, NULL); |
d2e54fae | 864 | mkdir_parents_label(filename, 0755); |
e9a5ef7c | 865 | label_context_set(filename, mode); |
baa30fbc | 866 | log_debug("mknod '%s' %c%u:%u\n", filename, type, maj, min); |
912541b0 KS |
867 | if (mknod(filename, mode, makedev(maj, min)) < 0 && errno == EEXIST) |
868 | utimensat(AT_FDCWD, filename, NULL, 0); | |
e9a5ef7c | 869 | label_context_clear(); |
912541b0 KS |
870 | } |
871 | ||
872 | fclose(f); | |
761dfddc KS |
873 | } |
874 | ||
cb9a0eee KS |
875 | static int mem_size_mb(void) |
876 | { | |
912541b0 KS |
877 | FILE *f; |
878 | char buf[4096]; | |
879 | long int memsize = -1; | |
cb9a0eee | 880 | |
47ef94ac | 881 | f = fopen("/proc/meminfo", "re"); |
912541b0 KS |
882 | if (f == NULL) |
883 | return -1; | |
cb9a0eee | 884 | |
912541b0 KS |
885 | while (fgets(buf, sizeof(buf), f) != NULL) { |
886 | long int value; | |
cb9a0eee | 887 | |
912541b0 KS |
888 | if (sscanf(buf, "MemTotal: %ld kB", &value) == 1) { |
889 | memsize = value / 1024; | |
890 | break; | |
891 | } | |
892 | } | |
cb9a0eee | 893 | |
912541b0 KS |
894 | fclose(f); |
895 | return memsize; | |
cb9a0eee KS |
896 | } |
897 | ||
5f59fa09 KS |
898 | static int convert_db(struct udev *udev) |
899 | { | |
912541b0 | 900 | char filename[UTIL_PATH_SIZE]; |
912541b0 KS |
901 | struct udev_enumerate *udev_enumerate; |
902 | struct udev_list_entry *list_entry; | |
903 | ||
904 | /* current database */ | |
6ada823a | 905 | if (access("/run/udev/data", F_OK) >= 0) |
912541b0 KS |
906 | return 0; |
907 | ||
908 | /* make sure we do not get here again */ | |
ddbe6850 | 909 | mkdir_p("/run/udev/data", 0755); |
912541b0 KS |
910 | |
911 | /* old database */ | |
d5a89d7d | 912 | strscpyl(filename, sizeof(filename), "/dev/.udev/db", NULL); |
912541b0 KS |
913 | if (access(filename, F_OK) < 0) |
914 | return 0; | |
915 | ||
c6eefe36 | 916 | print_kmsg("converting old udev database\n"); |
912541b0 KS |
917 | |
918 | udev_enumerate = udev_enumerate_new(udev); | |
919 | if (udev_enumerate == NULL) | |
920 | return -1; | |
921 | udev_enumerate_scan_devices(udev_enumerate); | |
922 | udev_list_entry_foreach(list_entry, udev_enumerate_get_list_entry(udev_enumerate)) { | |
923 | struct udev_device *device; | |
924 | ||
925 | device = udev_device_new_from_syspath(udev, udev_list_entry_get_name(list_entry)); | |
926 | if (device == NULL) | |
927 | continue; | |
928 | ||
929 | /* try to find the old database for devices without a current one */ | |
930 | if (udev_device_read_db(device, NULL) < 0) { | |
931 | bool have_db; | |
932 | const char *id; | |
933 | struct stat stats; | |
934 | char devpath[UTIL_PATH_SIZE]; | |
935 | char from[UTIL_PATH_SIZE]; | |
936 | ||
937 | have_db = false; | |
938 | ||
939 | /* find database in old location */ | |
940 | id = udev_device_get_id_filename(device); | |
d5a89d7d | 941 | strscpyl(from, sizeof(from), "/dev/.udev/db/", id, NULL); |
912541b0 KS |
942 | if (lstat(from, &stats) == 0) { |
943 | if (!have_db) { | |
944 | udev_device_read_db(device, from); | |
945 | have_db = true; | |
946 | } | |
947 | unlink(from); | |
948 | } | |
949 | ||
950 | /* find old database with $subsys:$sysname name */ | |
d5a89d7d | 951 | strscpyl(from, sizeof(from), "/dev/.udev/db/", |
6ada823a | 952 | udev_device_get_subsystem(device), ":", udev_device_get_sysname(device), NULL); |
912541b0 KS |
953 | if (lstat(from, &stats) == 0) { |
954 | if (!have_db) { | |
955 | udev_device_read_db(device, from); | |
956 | have_db = true; | |
957 | } | |
958 | unlink(from); | |
959 | } | |
960 | ||
961 | /* find old database with the encoded devpath name */ | |
962 | util_path_encode(udev_device_get_devpath(device), devpath, sizeof(devpath)); | |
d5a89d7d | 963 | strscpyl(from, sizeof(from), "/dev/.udev/db/", devpath, NULL); |
912541b0 KS |
964 | if (lstat(from, &stats) == 0) { |
965 | if (!have_db) { | |
966 | udev_device_read_db(device, from); | |
967 | have_db = true; | |
968 | } | |
969 | unlink(from); | |
970 | } | |
971 | ||
972 | /* write out new database */ | |
973 | if (have_db) | |
974 | udev_device_update_db(device); | |
975 | } | |
976 | udev_device_unref(device); | |
977 | } | |
978 | udev_enumerate_unref(udev_enumerate); | |
979 | return 0; | |
5f59fa09 KS |
980 | } |
981 | ||
7459bcdc KS |
982 | static int systemd_fds(struct udev *udev, int *rctrl, int *rnetlink) |
983 | { | |
912541b0 KS |
984 | int ctrl = -1, netlink = -1; |
985 | int fd, n; | |
986 | ||
987 | n = sd_listen_fds(true); | |
988 | if (n <= 0) | |
989 | return -1; | |
990 | ||
991 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
992 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
993 | if (ctrl >= 0) | |
994 | return -1; | |
995 | ctrl = fd; | |
996 | continue; | |
997 | } | |
998 | ||
999 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
1000 | if (netlink >= 0) | |
1001 | return -1; | |
1002 | netlink = fd; | |
1003 | continue; | |
1004 | } | |
1005 | ||
1006 | return -1; | |
1007 | } | |
1008 | ||
1009 | if (ctrl < 0 || netlink < 0) | |
1010 | return -1; | |
1011 | ||
baa30fbc | 1012 | log_debug("ctrl=%i netlink=%i\n", ctrl, netlink); |
912541b0 KS |
1013 | *rctrl = ctrl; |
1014 | *rnetlink = netlink; | |
1015 | return 0; | |
7459bcdc KS |
1016 | } |
1017 | ||
e6f86cac KS |
1018 | /* |
1019 | * read the kernel commandline, in case we need to get into debug mode | |
1020 | * udev.log-priority=<level> syslog priority | |
1021 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1022 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1023 | */ | |
1024 | static void kernel_cmdline_options(struct udev *udev) | |
1025 | { | |
1026 | char *line, *w, *state; | |
1027 | size_t l; | |
1028 | ||
1029 | if (read_one_line_file("/proc/cmdline", &line) < 0) | |
1030 | return; | |
1031 | ||
1032 | FOREACH_WORD_QUOTED(w, l, line, state) { | |
1033 | char *s, *opt; | |
1034 | ||
1035 | s = strndup(w, l); | |
1036 | if (!s) | |
1037 | break; | |
1038 | ||
1039 | /* accept the same options for the initrd, prefixed with "rd." */ | |
1040 | if (in_initrd() && startswith(s, "rd.")) | |
1041 | opt = s + 3; | |
1042 | else | |
1043 | opt = s; | |
1044 | ||
023b9d33 KS |
1045 | if (startswith(opt, "udev.log-priority=")) { |
1046 | int prio; | |
e6f86cac | 1047 | |
023b9d33 KS |
1048 | prio = util_log_priority(opt + 18); |
1049 | log_set_max_level(prio); | |
1050 | udev_set_log_priority(udev, prio); | |
1051 | } else if (startswith(opt, "udev.children-max=")) { | |
e6f86cac | 1052 | children_max = strtoul(opt + 18, NULL, 0); |
023b9d33 | 1053 | } else if (startswith(opt, "udev.exec-delay=")) { |
e6f86cac | 1054 | exec_delay = strtoul(opt + 16, NULL, 0); |
023b9d33 | 1055 | } |
e6f86cac KS |
1056 | |
1057 | free(s); | |
1058 | } | |
1059 | ||
1060 | free(line); | |
1061 | } | |
1062 | ||
59345311 | 1063 | int main(int argc, char *argv[]) |
c2cf4012 | 1064 | { |
912541b0 | 1065 | struct udev *udev; |
912541b0 KS |
1066 | sigset_t mask; |
1067 | int daemonize = false; | |
1068 | int resolve_names = 1; | |
1069 | static const struct option options[] = { | |
1070 | { "daemon", no_argument, NULL, 'd' }, | |
1071 | { "debug", no_argument, NULL, 'D' }, | |
1072 | { "children-max", required_argument, NULL, 'c' }, | |
1073 | { "exec-delay", required_argument, NULL, 'e' }, | |
1074 | { "resolve-names", required_argument, NULL, 'N' }, | |
1075 | { "help", no_argument, NULL, 'h' }, | |
1076 | { "version", no_argument, NULL, 'V' }, | |
1077 | {} | |
1078 | }; | |
1079 | int fd_ctrl = -1; | |
1080 | int fd_netlink = -1; | |
1081 | int fd_worker = -1; | |
1082 | struct epoll_event ep_ctrl, ep_inotify, ep_signal, ep_netlink, ep_worker; | |
1083 | struct udev_ctrl_connection *ctrl_conn = NULL; | |
912541b0 KS |
1084 | int rc = 1; |
1085 | ||
1086 | udev = udev_new(); | |
1087 | if (udev == NULL) | |
1088 | goto exit; | |
1089 | ||
4b261568 | 1090 | log_set_target(LOG_TARGET_AUTO); |
baa30fbc | 1091 | log_parse_environment(); |
4b261568 | 1092 | log_open(); |
912541b0 | 1093 | udev_set_log_fn(udev, udev_main_log); |
baa30fbc | 1094 | log_debug("version %s\n", VERSION); |
0f9963a8 | 1095 | label_init("/dev"); |
912541b0 KS |
1096 | |
1097 | for (;;) { | |
1098 | int option; | |
1099 | ||
5bbbe461 | 1100 | option = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL); |
912541b0 KS |
1101 | if (option == -1) |
1102 | break; | |
1103 | ||
1104 | switch (option) { | |
1105 | case 'd': | |
1106 | daemonize = true; | |
1107 | break; | |
1108 | case 'c': | |
1109 | children_max = strtoul(optarg, NULL, 0); | |
1110 | break; | |
1111 | case 'e': | |
1112 | exec_delay = strtoul(optarg, NULL, 0); | |
1113 | break; | |
1114 | case 'D': | |
1115 | debug = true; | |
194bbe33 | 1116 | log_set_max_level(LOG_DEBUG); |
7781e063 | 1117 | udev_set_log_priority(udev, LOG_DEBUG); |
912541b0 KS |
1118 | break; |
1119 | case 'N': | |
090be865 | 1120 | if (streq(optarg, "early")) { |
912541b0 | 1121 | resolve_names = 1; |
090be865 | 1122 | } else if (streq(optarg, "late")) { |
912541b0 | 1123 | resolve_names = 0; |
090be865 | 1124 | } else if (streq(optarg, "never")) { |
912541b0 KS |
1125 | resolve_names = -1; |
1126 | } else { | |
1127 | fprintf(stderr, "resolve-names must be early, late or never\n"); | |
baa30fbc | 1128 | log_error("resolve-names must be early, late or never\n"); |
912541b0 KS |
1129 | goto exit; |
1130 | } | |
1131 | break; | |
1132 | case 'h': | |
1133 | printf("Usage: udevd OPTIONS\n" | |
1134 | " --daemon\n" | |
1135 | " --debug\n" | |
1136 | " --children-max=<maximum number of workers>\n" | |
1137 | " --exec-delay=<seconds to wait before executing RUN=>\n" | |
1138 | " --resolve-names=early|late|never\n" | |
1139 | " --version\n" | |
1140 | " --help\n" | |
1141 | "\n"); | |
1142 | goto exit; | |
1143 | case 'V': | |
1144 | printf("%s\n", VERSION); | |
1145 | goto exit; | |
1146 | default: | |
1147 | goto exit; | |
1148 | } | |
1149 | } | |
1150 | ||
e6f86cac | 1151 | kernel_cmdline_options(udev); |
912541b0 KS |
1152 | |
1153 | if (getuid() != 0) { | |
1154 | fprintf(stderr, "root privileges required\n"); | |
baa30fbc | 1155 | log_error("root privileges required\n"); |
912541b0 KS |
1156 | goto exit; |
1157 | } | |
1158 | ||
1159 | /* set umask before creating any file/directory */ | |
1160 | chdir("/"); | |
1161 | umask(022); | |
1162 | ||
6ada823a | 1163 | mkdir("/run/udev", 0755); |
912541b0 | 1164 | |
01ed0e23 | 1165 | dev_setup(NULL); |
912541b0 KS |
1166 | static_dev_create_from_modules(udev); |
1167 | ||
1168 | /* before opening new files, make sure std{in,out,err} fds are in a sane state */ | |
1169 | if (daemonize) { | |
1170 | int fd; | |
1171 | ||
1172 | fd = open("/dev/null", O_RDWR); | |
1173 | if (fd >= 0) { | |
1174 | if (write(STDOUT_FILENO, 0, 0) < 0) | |
1175 | dup2(fd, STDOUT_FILENO); | |
1176 | if (write(STDERR_FILENO, 0, 0) < 0) | |
1177 | dup2(fd, STDERR_FILENO); | |
1178 | if (fd > STDERR_FILENO) | |
1179 | close(fd); | |
1180 | } else { | |
1181 | fprintf(stderr, "cannot open /dev/null\n"); | |
baa30fbc | 1182 | log_error("cannot open /dev/null\n"); |
912541b0 KS |
1183 | } |
1184 | } | |
1185 | ||
1186 | if (systemd_fds(udev, &fd_ctrl, &fd_netlink) >= 0) { | |
c5315881 | 1187 | /* get control and netlink socket from systemd */ |
912541b0 KS |
1188 | udev_ctrl = udev_ctrl_new_from_fd(udev, fd_ctrl); |
1189 | if (udev_ctrl == NULL) { | |
baa30fbc | 1190 | log_error("error taking over udev control socket"); |
912541b0 KS |
1191 | rc = 1; |
1192 | goto exit; | |
1193 | } | |
1194 | ||
1195 | monitor = udev_monitor_new_from_netlink_fd(udev, "kernel", fd_netlink); | |
1196 | if (monitor == NULL) { | |
baa30fbc | 1197 | log_error("error taking over netlink socket\n"); |
912541b0 KS |
1198 | rc = 3; |
1199 | goto exit; | |
1200 | } | |
194bbe33 KS |
1201 | |
1202 | /* get our own cgroup, we regularly kill everything udev has left behind */ | |
1203 | if (cg_get_by_pid(SYSTEMD_CGROUP_CONTROLLER, 0, &udev_cgroup) < 0) | |
1204 | udev_cgroup = NULL; | |
912541b0 KS |
1205 | } else { |
1206 | /* open control and netlink socket */ | |
1207 | udev_ctrl = udev_ctrl_new(udev); | |
1208 | if (udev_ctrl == NULL) { | |
1209 | fprintf(stderr, "error initializing udev control socket"); | |
baa30fbc | 1210 | log_error("error initializing udev control socket"); |
912541b0 KS |
1211 | rc = 1; |
1212 | goto exit; | |
1213 | } | |
1214 | fd_ctrl = udev_ctrl_get_fd(udev_ctrl); | |
1215 | ||
1216 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1217 | if (monitor == NULL) { | |
1218 | fprintf(stderr, "error initializing netlink socket\n"); | |
baa30fbc | 1219 | log_error("error initializing netlink socket\n"); |
912541b0 KS |
1220 | rc = 3; |
1221 | goto exit; | |
1222 | } | |
1223 | fd_netlink = udev_monitor_get_fd(monitor); | |
1224 | } | |
1225 | ||
1226 | if (udev_monitor_enable_receiving(monitor) < 0) { | |
1227 | fprintf(stderr, "error binding netlink socket\n"); | |
baa30fbc | 1228 | log_error("error binding netlink socket\n"); |
912541b0 KS |
1229 | rc = 3; |
1230 | goto exit; | |
1231 | } | |
1232 | ||
1233 | if (udev_ctrl_enable_receiving(udev_ctrl) < 0) { | |
1234 | fprintf(stderr, "error binding udev control socket\n"); | |
baa30fbc | 1235 | log_error("error binding udev control socket\n"); |
912541b0 KS |
1236 | rc = 1; |
1237 | goto exit; | |
1238 | } | |
1239 | ||
1240 | udev_monitor_set_receive_buffer_size(monitor, 128*1024*1024); | |
1241 | ||
1242 | /* create queue file before signalling 'ready', to make sure we block 'settle' */ | |
1243 | udev_queue_export = udev_queue_export_new(udev); | |
1244 | if (udev_queue_export == NULL) { | |
baa30fbc | 1245 | log_error("error creating queue file\n"); |
912541b0 KS |
1246 | goto exit; |
1247 | } | |
1248 | ||
1249 | if (daemonize) { | |
1250 | pid_t pid; | |
912541b0 KS |
1251 | |
1252 | pid = fork(); | |
1253 | switch (pid) { | |
1254 | case 0: | |
1255 | break; | |
1256 | case -1: | |
baa30fbc | 1257 | log_error("fork of daemon failed: %m\n"); |
912541b0 KS |
1258 | rc = 4; |
1259 | goto exit; | |
1260 | default: | |
1261 | rc = EXIT_SUCCESS; | |
1262 | goto exit_daemonize; | |
1263 | } | |
1264 | ||
1265 | setsid(); | |
1266 | ||
145dae7e | 1267 | write_one_line_file("/proc/self/oom_score_adj", "-1000"); |
912541b0 KS |
1268 | } else { |
1269 | sd_notify(1, "READY=1"); | |
1270 | } | |
1271 | ||
c6eefe36 | 1272 | print_kmsg("starting version " VERSION "\n"); |
912541b0 KS |
1273 | |
1274 | if (!debug) { | |
1275 | int fd; | |
1276 | ||
1277 | fd = open("/dev/null", O_RDWR); | |
1278 | if (fd >= 0) { | |
1279 | dup2(fd, STDIN_FILENO); | |
1280 | dup2(fd, STDOUT_FILENO); | |
1281 | dup2(fd, STDERR_FILENO); | |
1282 | close(fd); | |
1283 | } | |
1284 | } | |
1285 | ||
1286 | fd_inotify = udev_watch_init(udev); | |
1287 | if (fd_inotify < 0) { | |
1288 | fprintf(stderr, "error initializing inotify\n"); | |
baa30fbc | 1289 | log_error("error initializing inotify\n"); |
912541b0 KS |
1290 | rc = 4; |
1291 | goto exit; | |
1292 | } | |
1293 | udev_watch_restore(udev); | |
1294 | ||
1295 | /* block and listen to all signals on signalfd */ | |
1296 | sigfillset(&mask); | |
1297 | sigprocmask(SIG_SETMASK, &mask, &sigmask_orig); | |
1298 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
1299 | if (fd_signal < 0) { | |
1300 | fprintf(stderr, "error creating signalfd\n"); | |
baa30fbc | 1301 | log_error("error creating signalfd\n"); |
912541b0 KS |
1302 | rc = 5; |
1303 | goto exit; | |
1304 | } | |
1305 | ||
1306 | /* unnamed socket from workers to the main daemon */ | |
1307 | if (socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, worker_watch) < 0) { | |
1308 | fprintf(stderr, "error creating socketpair\n"); | |
baa30fbc | 1309 | log_error("error creating socketpair\n"); |
912541b0 KS |
1310 | rc = 6; |
1311 | goto exit; | |
1312 | } | |
1313 | fd_worker = worker_watch[READ_END]; | |
1314 | ||
1315 | udev_builtin_init(udev); | |
1316 | ||
1317 | rules = udev_rules_new(udev, resolve_names); | |
1318 | if (rules == NULL) { | |
baa30fbc | 1319 | log_error("error reading rules\n"); |
912541b0 KS |
1320 | goto exit; |
1321 | } | |
1322 | ||
1323 | memset(&ep_ctrl, 0, sizeof(struct epoll_event)); | |
1324 | ep_ctrl.events = EPOLLIN; | |
1325 | ep_ctrl.data.fd = fd_ctrl; | |
1326 | ||
1327 | memset(&ep_inotify, 0, sizeof(struct epoll_event)); | |
1328 | ep_inotify.events = EPOLLIN; | |
1329 | ep_inotify.data.fd = fd_inotify; | |
1330 | ||
1331 | memset(&ep_signal, 0, sizeof(struct epoll_event)); | |
1332 | ep_signal.events = EPOLLIN; | |
1333 | ep_signal.data.fd = fd_signal; | |
1334 | ||
1335 | memset(&ep_netlink, 0, sizeof(struct epoll_event)); | |
1336 | ep_netlink.events = EPOLLIN; | |
1337 | ep_netlink.data.fd = fd_netlink; | |
1338 | ||
1339 | memset(&ep_worker, 0, sizeof(struct epoll_event)); | |
1340 | ep_worker.events = EPOLLIN; | |
1341 | ep_worker.data.fd = fd_worker; | |
1342 | ||
1343 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
1344 | if (fd_ep < 0) { | |
baa30fbc | 1345 | log_error("error creating epoll fd: %m\n"); |
912541b0 KS |
1346 | goto exit; |
1347 | } | |
1348 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_ctrl, &ep_ctrl) < 0 || | |
1349 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_inotify, &ep_inotify) < 0 || | |
1350 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || | |
1351 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_netlink, &ep_netlink) < 0 || | |
1352 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_worker, &ep_worker) < 0) { | |
baa30fbc | 1353 | log_error("fail to add fds to epoll: %m\n"); |
912541b0 KS |
1354 | goto exit; |
1355 | } | |
1356 | ||
1357 | /* if needed, convert old database from earlier udev version */ | |
1358 | convert_db(udev); | |
1359 | ||
1360 | if (children_max <= 0) { | |
1361 | int memsize = mem_size_mb(); | |
1362 | ||
1363 | /* set value depending on the amount of RAM */ | |
1364 | if (memsize > 0) | |
d315bba6 | 1365 | children_max = 16 + (memsize / 8); |
912541b0 | 1366 | else |
d315bba6 | 1367 | children_max = 16; |
912541b0 | 1368 | } |
baa30fbc | 1369 | log_debug("set children_max to %u\n", children_max); |
912541b0 KS |
1370 | |
1371 | udev_rules_apply_static_dev_perms(rules); | |
1372 | ||
1373 | udev_list_node_init(&event_list); | |
1374 | udev_list_node_init(&worker_list); | |
1375 | ||
1376 | for (;;) { | |
40fe8b11 | 1377 | static usec_t last_usec; |
912541b0 KS |
1378 | struct epoll_event ev[8]; |
1379 | int fdcount; | |
1380 | int timeout; | |
1381 | bool is_worker, is_signal, is_inotify, is_netlink, is_ctrl; | |
1382 | int i; | |
1383 | ||
1384 | if (udev_exit) { | |
1385 | /* close sources of new events and discard buffered events */ | |
1386 | if (fd_ctrl >= 0) { | |
1387 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_ctrl, NULL); | |
1388 | fd_ctrl = -1; | |
1389 | } | |
1390 | if (monitor != NULL) { | |
1391 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_netlink, NULL); | |
1392 | udev_monitor_unref(monitor); | |
1393 | monitor = NULL; | |
1394 | } | |
1395 | if (fd_inotify >= 0) { | |
1396 | epoll_ctl(fd_ep, EPOLL_CTL_DEL, fd_inotify, NULL); | |
1397 | close(fd_inotify); | |
1398 | fd_inotify = -1; | |
1399 | } | |
1400 | ||
1401 | /* discard queued events and kill workers */ | |
1402 | event_queue_cleanup(udev, EVENT_QUEUED); | |
194bbe33 | 1403 | worker_kill(udev); |
912541b0 KS |
1404 | |
1405 | /* exit after all has cleaned up */ | |
1406 | if (udev_list_node_is_empty(&event_list) && udev_list_node_is_empty(&worker_list)) | |
1407 | break; | |
1408 | ||
1409 | /* timeout at exit for workers to finish */ | |
e64fae55 | 1410 | timeout = 30 * 1000; |
194bbe33 | 1411 | } else if (udev_list_node_is_empty(&event_list) && !children) { |
e64fae55 | 1412 | /* we are idle */ |
912541b0 | 1413 | timeout = -1; |
194bbe33 KS |
1414 | |
1415 | /* cleanup possible left-over processes in our cgroup */ | |
1416 | if (udev_cgroup) | |
1417 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, udev_cgroup, SIGKILL, false, true, NULL); | |
e64fae55 KS |
1418 | } else { |
1419 | /* kill idle or hanging workers */ | |
1420 | timeout = 3 * 1000; | |
912541b0 | 1421 | } |
8fef0ff2 | 1422 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); |
912541b0 KS |
1423 | if (fdcount < 0) |
1424 | continue; | |
1425 | ||
1426 | if (fdcount == 0) { | |
e64fae55 KS |
1427 | struct udev_list_node *loop; |
1428 | ||
1429 | /* timeout */ | |
912541b0 | 1430 | if (udev_exit) { |
baa30fbc | 1431 | log_error("timeout, giving up waiting for workers to finish\n"); |
912541b0 KS |
1432 | break; |
1433 | } | |
1434 | ||
e64fae55 KS |
1435 | /* kill idle workers */ |
1436 | if (udev_list_node_is_empty(&event_list)) { | |
baa30fbc | 1437 | log_debug("cleanup idle workers\n"); |
194bbe33 | 1438 | worker_kill(udev); |
e64fae55 KS |
1439 | } |
1440 | ||
1441 | /* check for hanging events */ | |
1442 | udev_list_node_foreach(loop, &worker_list) { | |
1443 | struct worker *worker = node_to_worker(loop); | |
1444 | ||
1445 | if (worker->state != WORKER_RUNNING) | |
1446 | continue; | |
1447 | ||
40fe8b11 | 1448 | if ((now(CLOCK_MONOTONIC) - worker->event_start_usec) > 30 * 1000 * 1000) { |
04a9d3a0 | 1449 | log_error("worker [%u] %s timeout; kill it\n", worker->pid, |
e64fae55 KS |
1450 | worker->event ? worker->event->devpath : "<idle>"); |
1451 | kill(worker->pid, SIGKILL); | |
1452 | worker->state = WORKER_KILLED; | |
1453 | /* drop reference taken for state 'running' */ | |
1454 | worker_unref(worker); | |
1455 | if (worker->event) { | |
baa30fbc KS |
1456 | log_error("seq %llu '%s' killed\n", |
1457 | udev_device_get_seqnum(worker->event->dev), worker->event->devpath); | |
e64fae55 KS |
1458 | worker->event->exitcode = -64; |
1459 | event_queue_delete(worker->event, true); | |
1460 | worker->event = NULL; | |
1461 | } | |
1462 | } | |
1463 | } | |
1464 | ||
912541b0 KS |
1465 | } |
1466 | ||
1467 | is_worker = is_signal = is_inotify = is_netlink = is_ctrl = false; | |
1468 | for (i = 0; i < fdcount; i++) { | |
1469 | if (ev[i].data.fd == fd_worker && ev[i].events & EPOLLIN) | |
1470 | is_worker = true; | |
1471 | else if (ev[i].data.fd == fd_netlink && ev[i].events & EPOLLIN) | |
1472 | is_netlink = true; | |
1473 | else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) | |
1474 | is_signal = true; | |
1475 | else if (ev[i].data.fd == fd_inotify && ev[i].events & EPOLLIN) | |
1476 | is_inotify = true; | |
1477 | else if (ev[i].data.fd == fd_ctrl && ev[i].events & EPOLLIN) | |
1478 | is_ctrl = true; | |
1479 | } | |
1480 | ||
1481 | /* check for changed config, every 3 seconds at most */ | |
40fe8b11 | 1482 | if ((now(CLOCK_MONOTONIC) - last_usec) > 3 * 1000 * 1000) { |
6ada823a | 1483 | if (udev_rules_check_timestamp(rules)) |
912541b0 KS |
1484 | reload = true; |
1485 | if (udev_builtin_validate(udev)) | |
1486 | reload = true; | |
1487 | ||
40fe8b11 | 1488 | last_usec = now(CLOCK_MONOTONIC); |
912541b0 KS |
1489 | } |
1490 | ||
1491 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
1492 | if (reload) { | |
194bbe33 | 1493 | worker_kill(udev); |
912541b0 KS |
1494 | rules = udev_rules_unref(rules); |
1495 | udev_builtin_exit(udev); | |
7781e063 | 1496 | reload = false; |
912541b0 KS |
1497 | } |
1498 | ||
1499 | /* event has finished */ | |
1500 | if (is_worker) | |
1501 | worker_returned(fd_worker); | |
1502 | ||
1503 | if (is_netlink) { | |
1504 | struct udev_device *dev; | |
1505 | ||
1506 | dev = udev_monitor_receive_device(monitor); | |
1507 | if (dev != NULL) { | |
40fe8b11 | 1508 | udev_device_set_usec_initialized(dev, now(CLOCK_MONOTONIC)); |
912541b0 KS |
1509 | if (event_queue_insert(dev) < 0) |
1510 | udev_device_unref(dev); | |
1511 | } | |
1512 | } | |
1513 | ||
1514 | /* start new events */ | |
1515 | if (!udev_list_node_is_empty(&event_list) && !udev_exit && !stop_exec_queue) { | |
7781e063 | 1516 | udev_builtin_init(udev); |
912541b0 KS |
1517 | if (rules == NULL) |
1518 | rules = udev_rules_new(udev, resolve_names); | |
1519 | if (rules != NULL) | |
1520 | event_queue_start(udev); | |
1521 | } | |
1522 | ||
1523 | if (is_signal) { | |
1524 | struct signalfd_siginfo fdsi; | |
1525 | ssize_t size; | |
1526 | ||
1527 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
1528 | if (size == sizeof(struct signalfd_siginfo)) | |
1529 | handle_signal(udev, fdsi.ssi_signo); | |
1530 | } | |
1531 | ||
1532 | /* we are shutting down, the events below are not handled anymore */ | |
1533 | if (udev_exit) | |
1534 | continue; | |
1535 | ||
1536 | /* device node watch */ | |
1537 | if (is_inotify) | |
1538 | handle_inotify(udev); | |
1539 | ||
1540 | /* | |
1541 | * This needs to be after the inotify handling, to make sure, | |
1542 | * that the ping is send back after the possibly generated | |
1543 | * "change" events by the inotify device node watch. | |
1544 | * | |
1545 | * A single time we may receive a client connection which we need to | |
1546 | * keep open to block the client. It will be closed right before we | |
1547 | * exit. | |
1548 | */ | |
1549 | if (is_ctrl) | |
1550 | ctrl_conn = handle_ctrl_msg(udev_ctrl); | |
1551 | } | |
1552 | ||
1553 | rc = EXIT_SUCCESS; | |
53921bfa | 1554 | exit: |
912541b0 KS |
1555 | udev_queue_export_cleanup(udev_queue_export); |
1556 | udev_ctrl_cleanup(udev_ctrl); | |
1f5a5100 | 1557 | exit_daemonize: |
912541b0 KS |
1558 | if (fd_ep >= 0) |
1559 | close(fd_ep); | |
1560 | worker_list_cleanup(udev); | |
1561 | event_queue_cleanup(udev, EVENT_UNDEF); | |
1562 | udev_rules_unref(rules); | |
1563 | udev_builtin_exit(udev); | |
1564 | if (fd_signal >= 0) | |
1565 | close(fd_signal); | |
1566 | if (worker_watch[READ_END] >= 0) | |
1567 | close(worker_watch[READ_END]); | |
1568 | if (worker_watch[WRITE_END] >= 0) | |
1569 | close(worker_watch[WRITE_END]); | |
1570 | udev_monitor_unref(monitor); | |
1571 | udev_queue_export_unref(udev_queue_export); | |
1572 | udev_ctrl_connection_unref(ctrl_conn); | |
1573 | udev_ctrl_unref(udev_ctrl); | |
e9a5ef7c | 1574 | label_finish(); |
912541b0 | 1575 | udev_unref(udev); |
baa30fbc | 1576 | log_close(); |
912541b0 | 1577 | return rc; |
7fafc032 | 1578 | } |