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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 <fcntl.h> |
b52a01ee | 30 | #include <getopt.h> |
3ebdb81e | 31 | #include <sys/file.h> |
820fc48f | 32 | #include <sys/time.h> |
1e03b754 KS |
33 | #include <sys/prctl.h> |
34 | #include <sys/socket.h> | |
35 | #include <sys/signalfd.h> | |
ff2c503d | 36 | #include <sys/epoll.h> |
ede34445 | 37 | #include <sys/mount.h> |
138068d6 | 38 | #include <sys/wait.h> |
dc117daa | 39 | #include <sys/stat.h> |
c895fd00 | 40 | #include <sys/ioctl.h> |
01618658 | 41 | #include <sys/inotify.h> |
7fafc032 | 42 | |
392ef7a2 | 43 | #include "sd-daemon.h" |
693d371d | 44 | #include "sd-event.h" |
8314de1d TG |
45 | |
46 | #include "signal-util.h" | |
693d371d | 47 | #include "event-util.h" |
d7b8eec7 | 48 | #include "rtnl-util.h" |
194bbe33 | 49 | #include "cgroup-util.h" |
4fa4d885 | 50 | #include "process-util.h" |
5ba2dc25 | 51 | #include "dev-setup.h" |
a5c32cff | 52 | #include "fileio.h" |
d7b8eec7 LP |
53 | #include "selinux-util.h" |
54 | #include "udev.h" | |
55 | #include "udev-util.h" | |
6482f626 | 56 | #include "formats-util.h" |
a505965d | 57 | #include "hashmap.h" |
7fafc032 | 58 | |
bba7a484 TG |
59 | static bool arg_debug = false; |
60 | static int arg_daemonize = false; | |
61 | static int arg_resolve_names = 1; | |
020328e1 | 62 | static unsigned arg_children_max; |
bba7a484 TG |
63 | static int arg_exec_delay; |
64 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
65 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
c0c6806b TG |
66 | |
67 | typedef struct Manager { | |
68 | struct udev *udev; | |
693d371d | 69 | sd_event *event; |
c0c6806b | 70 | Hashmap *workers; |
ecb17862 | 71 | struct udev_list_node events; |
c26d1879 | 72 | const char *cgroup; |
cb49a4f2 | 73 | pid_t pid; /* the process that originally allocated the manager object */ |
c0c6806b | 74 | |
ecb17862 | 75 | struct udev_rules *rules; |
c0c6806b TG |
76 | struct udev_list properties; |
77 | ||
78 | struct udev_monitor *monitor; | |
79 | struct udev_ctrl *ctrl; | |
80 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e237d8cb | 81 | int fd_inotify; |
e237d8cb TG |
82 | int worker_watch[2]; |
83 | ||
693d371d TG |
84 | sd_event_source *ctrl_event; |
85 | sd_event_source *uevent_event; | |
86 | sd_event_source *inotify_event; | |
87 | ||
7c4c7e89 TG |
88 | usec_t last_usec; |
89 | ||
c0c6806b | 90 | bool stop_exec_queue:1; |
c0c6806b TG |
91 | bool exit:1; |
92 | } Manager; | |
1e03b754 | 93 | |
1e03b754 | 94 | enum event_state { |
912541b0 KS |
95 | EVENT_UNDEF, |
96 | EVENT_QUEUED, | |
97 | EVENT_RUNNING, | |
1e03b754 KS |
98 | }; |
99 | ||
100 | struct event { | |
912541b0 | 101 | struct udev_list_node node; |
cb49a4f2 | 102 | Manager *manager; |
912541b0 KS |
103 | struct udev *udev; |
104 | struct udev_device *dev; | |
6969c349 | 105 | struct udev_device *dev_kernel; |
c6aa11f2 | 106 | struct worker *worker; |
912541b0 | 107 | enum event_state state; |
912541b0 KS |
108 | unsigned long long int delaying_seqnum; |
109 | unsigned long long int seqnum; | |
110 | const char *devpath; | |
111 | size_t devpath_len; | |
112 | const char *devpath_old; | |
113 | dev_t devnum; | |
912541b0 | 114 | int ifindex; |
ea6039a3 | 115 | bool is_block; |
693d371d TG |
116 | sd_event_source *timeout_warning; |
117 | sd_event_source *timeout; | |
1e03b754 KS |
118 | }; |
119 | ||
9ec6e95b | 120 | static inline struct event *node_to_event(struct udev_list_node *node) { |
b27ee00b | 121 | return container_of(node, struct event, node); |
1e03b754 KS |
122 | } |
123 | ||
ecb17862 | 124 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
ff2c503d | 125 | |
1e03b754 | 126 | enum worker_state { |
912541b0 KS |
127 | WORKER_UNDEF, |
128 | WORKER_RUNNING, | |
129 | WORKER_IDLE, | |
130 | WORKER_KILLED, | |
1e03b754 KS |
131 | }; |
132 | ||
133 | struct worker { | |
c0c6806b | 134 | Manager *manager; |
912541b0 | 135 | struct udev_list_node node; |
912541b0 KS |
136 | int refcount; |
137 | pid_t pid; | |
138 | struct udev_monitor *monitor; | |
139 | enum worker_state state; | |
140 | struct event *event; | |
1e03b754 KS |
141 | }; |
142 | ||
143 | /* passed from worker to main process */ | |
144 | struct worker_message { | |
1e03b754 KS |
145 | }; |
146 | ||
c6aa11f2 | 147 | static void event_free(struct event *event) { |
cb49a4f2 TG |
148 | int r; |
149 | ||
c6aa11f2 TG |
150 | if (!event) |
151 | return; | |
152 | ||
912541b0 | 153 | udev_list_node_remove(&event->node); |
912541b0 | 154 | udev_device_unref(event->dev); |
6969c349 | 155 | udev_device_unref(event->dev_kernel); |
c6aa11f2 | 156 | |
693d371d TG |
157 | sd_event_source_unref(event->timeout_warning); |
158 | sd_event_source_unref(event->timeout); | |
159 | ||
c6aa11f2 TG |
160 | if (event->worker) |
161 | event->worker->event = NULL; | |
162 | ||
cb49a4f2 TG |
163 | assert(event->manager); |
164 | ||
165 | if (udev_list_node_is_empty(&event->manager->events)) { | |
166 | /* only clean up the queue from the process that created it */ | |
167 | if (event->manager->pid == getpid()) { | |
168 | r = unlink("/run/udev/queue"); | |
169 | if (r < 0) | |
170 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
171 | } | |
172 | } | |
173 | ||
912541b0 | 174 | free(event); |
aa8734ff | 175 | } |
7a770250 | 176 | |
c6aa11f2 TG |
177 | static void worker_free(struct worker *worker) { |
178 | if (!worker) | |
179 | return; | |
bc113de9 | 180 | |
c0c6806b TG |
181 | assert(worker->manager); |
182 | ||
183 | hashmap_remove(worker->manager->workers, UINT_TO_PTR(worker->pid)); | |
912541b0 | 184 | udev_monitor_unref(worker->monitor); |
c6aa11f2 TG |
185 | event_free(worker->event); |
186 | ||
c6aa11f2 | 187 | free(worker); |
ff2c503d KS |
188 | } |
189 | ||
c0c6806b | 190 | static void manager_workers_free(Manager *manager) { |
a505965d TG |
191 | struct worker *worker; |
192 | Iterator i; | |
ff2c503d | 193 | |
c0c6806b TG |
194 | assert(manager); |
195 | ||
196 | HASHMAP_FOREACH(worker, manager->workers, i) | |
c6aa11f2 | 197 | worker_free(worker); |
a505965d | 198 | |
c0c6806b | 199 | manager->workers = hashmap_free(manager->workers); |
fc465079 KS |
200 | } |
201 | ||
c0c6806b | 202 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { |
a505965d TG |
203 | _cleanup_free_ struct worker *worker = NULL; |
204 | int r; | |
3a19b32a TG |
205 | |
206 | assert(ret); | |
c0c6806b | 207 | assert(manager); |
3a19b32a TG |
208 | assert(worker_monitor); |
209 | assert(pid > 1); | |
210 | ||
211 | worker = new0(struct worker, 1); | |
212 | if (!worker) | |
213 | return -ENOMEM; | |
214 | ||
39c19cf1 | 215 | worker->refcount = 1; |
c0c6806b | 216 | worker->manager = manager; |
3a19b32a TG |
217 | /* close monitor, but keep address around */ |
218 | udev_monitor_disconnect(worker_monitor); | |
219 | worker->monitor = udev_monitor_ref(worker_monitor); | |
220 | worker->pid = pid; | |
a505965d | 221 | |
c0c6806b | 222 | r = hashmap_ensure_allocated(&manager->workers, NULL); |
a505965d TG |
223 | if (r < 0) |
224 | return r; | |
225 | ||
c0c6806b | 226 | r = hashmap_put(manager->workers, UINT_TO_PTR(pid), worker); |
a505965d TG |
227 | if (r < 0) |
228 | return r; | |
229 | ||
3a19b32a | 230 | *ret = worker; |
a505965d | 231 | worker = NULL; |
3a19b32a TG |
232 | |
233 | return 0; | |
234 | } | |
235 | ||
4fa4d885 TG |
236 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
237 | struct event *event = userdata; | |
238 | ||
239 | assert(event); | |
240 | assert(event->worker); | |
241 | ||
242 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
243 | event->worker->state = WORKER_KILLED; | |
244 | ||
245 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
246 | ||
247 | return 1; | |
248 | } | |
249 | ||
250 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
251 | struct event *event = userdata; | |
252 | ||
253 | assert(event); | |
254 | ||
255 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
256 | ||
257 | return 1; | |
258 | } | |
259 | ||
39c19cf1 | 260 | static void worker_attach_event(struct worker *worker, struct event *event) { |
693d371d TG |
261 | sd_event *e; |
262 | uint64_t usec; | |
263 | int r; | |
264 | ||
c6aa11f2 | 265 | assert(worker); |
693d371d | 266 | assert(worker->manager); |
c6aa11f2 TG |
267 | assert(event); |
268 | assert(!event->worker); | |
269 | assert(!worker->event); | |
270 | ||
39c19cf1 | 271 | worker->state = WORKER_RUNNING; |
39c19cf1 TG |
272 | worker->event = event; |
273 | event->state = EVENT_RUNNING; | |
c6aa11f2 | 274 | event->worker = worker; |
693d371d TG |
275 | |
276 | e = worker->manager->event; | |
277 | ||
278 | r = sd_event_now(e, clock_boottime_or_monotonic(), &usec); | |
279 | if (r < 0) | |
280 | return; | |
281 | ||
282 | (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), | |
283 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); | |
284 | ||
285 | (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), | |
286 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); | |
39c19cf1 TG |
287 | } |
288 | ||
e237d8cb TG |
289 | static void manager_free(Manager *manager) { |
290 | if (!manager) | |
291 | return; | |
292 | ||
b2d21d93 TG |
293 | udev_builtin_exit(manager->udev); |
294 | ||
693d371d TG |
295 | sd_event_source_unref(manager->ctrl_event); |
296 | sd_event_source_unref(manager->uevent_event); | |
297 | sd_event_source_unref(manager->inotify_event); | |
298 | ||
e237d8cb | 299 | udev_unref(manager->udev); |
693d371d | 300 | sd_event_unref(manager->event); |
e237d8cb TG |
301 | manager_workers_free(manager); |
302 | event_queue_cleanup(manager, EVENT_UNDEF); | |
303 | ||
304 | udev_monitor_unref(manager->monitor); | |
305 | udev_ctrl_unref(manager->ctrl); | |
306 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
307 | ||
308 | udev_list_cleanup(&manager->properties); | |
309 | udev_rules_unref(manager->rules); | |
e237d8cb | 310 | |
e237d8cb TG |
311 | safe_close(manager->fd_inotify); |
312 | safe_close_pair(manager->worker_watch); | |
313 | ||
314 | free(manager); | |
315 | } | |
316 | ||
317 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
318 | ||
9a73bd7c TG |
319 | static int worker_send_message(int fd) { |
320 | struct worker_message message = {}; | |
321 | ||
322 | return loop_write(fd, &message, sizeof(message), false); | |
323 | } | |
324 | ||
c0c6806b | 325 | static void worker_spawn(Manager *manager, struct event *event) { |
912541b0 | 326 | struct udev *udev = event->udev; |
3a19b32a | 327 | _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; |
912541b0 KS |
328 | pid_t pid; |
329 | ||
330 | /* listen for new events */ | |
331 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
332 | if (worker_monitor == NULL) | |
333 | return; | |
334 | /* allow the main daemon netlink address to send devices to the worker */ | |
c0c6806b | 335 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
912541b0 KS |
336 | udev_monitor_enable_receiving(worker_monitor); |
337 | ||
912541b0 KS |
338 | pid = fork(); |
339 | switch (pid) { | |
340 | case 0: { | |
341 | struct udev_device *dev = NULL; | |
2dd9f98d | 342 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; |
912541b0 | 343 | int fd_monitor; |
e237d8cb | 344 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
2dd9f98d TG |
345 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
346 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
912541b0 | 347 | sigset_t mask; |
6af5e6a4 | 348 | int r = 0; |
912541b0 | 349 | |
43095991 | 350 | /* take initial device from queue */ |
912541b0 KS |
351 | dev = event->dev; |
352 | event->dev = NULL; | |
353 | ||
39fd2ca1 TG |
354 | unsetenv("NOTIFY_SOCKET"); |
355 | ||
c0c6806b | 356 | manager_workers_free(manager); |
ecb17862 | 357 | event_queue_cleanup(manager, EVENT_UNDEF); |
6d1b1e0b | 358 | |
e237d8cb | 359 | manager->monitor = udev_monitor_unref(manager->monitor); |
6d1b1e0b | 360 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 361 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
693d371d | 362 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 363 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
912541b0 | 364 | |
693d371d TG |
365 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
366 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
367 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
368 | ||
369 | manager->event = sd_event_unref(manager->event); | |
370 | ||
912541b0 KS |
371 | sigfillset(&mask); |
372 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
373 | if (fd_signal < 0) { | |
6af5e6a4 | 374 | r = log_error_errno(errno, "error creating signalfd %m"); |
912541b0 KS |
375 | goto out; |
376 | } | |
2dd9f98d TG |
377 | ep_signal.data.fd = fd_signal; |
378 | ||
379 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
380 | ep_monitor.data.fd = fd_monitor; | |
912541b0 KS |
381 | |
382 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
383 | if (fd_ep < 0) { | |
6af5e6a4 | 384 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
912541b0 KS |
385 | goto out; |
386 | } | |
387 | ||
912541b0 KS |
388 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
389 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
6af5e6a4 | 390 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
912541b0 KS |
391 | goto out; |
392 | } | |
393 | ||
394 | /* request TERM signal if parent exits */ | |
395 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
396 | ||
145dae7e | 397 | /* reset OOM score, we only protect the main daemon */ |
574d5f2d | 398 | write_string_file("/proc/self/oom_score_adj", "0"); |
145dae7e | 399 | |
912541b0 KS |
400 | for (;;) { |
401 | struct udev_event *udev_event; | |
6af5e6a4 | 402 | int fd_lock = -1; |
912541b0 | 403 | |
3b64e4d4 TG |
404 | assert(dev); |
405 | ||
9f6445e3 | 406 | log_debug("seq %llu running", udev_device_get_seqnum(dev)); |
912541b0 KS |
407 | udev_event = udev_event_new(dev); |
408 | if (udev_event == NULL) { | |
6af5e6a4 | 409 | r = -ENOMEM; |
912541b0 KS |
410 | goto out; |
411 | } | |
412 | ||
bba7a484 TG |
413 | if (arg_exec_delay > 0) |
414 | udev_event->exec_delay = arg_exec_delay; | |
912541b0 | 415 | |
3ebdb81e | 416 | /* |
2e5b17d0 | 417 | * Take a shared lock on the device node; this establishes |
3ebdb81e | 418 | * a concept of device "ownership" to serialize device |
2e5b17d0 | 419 | * access. External processes holding an exclusive lock will |
3ebdb81e | 420 | * cause udev to skip the event handling; in the case udev |
2e5b17d0 | 421 | * acquired the lock, the external process can block until |
3ebdb81e KS |
422 | * udev has finished its event handling. |
423 | */ | |
2e5b17d0 KS |
424 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
425 | streq_ptr("block", udev_device_get_subsystem(dev)) && | |
426 | !startswith(udev_device_get_sysname(dev), "dm-") && | |
427 | !startswith(udev_device_get_sysname(dev), "md")) { | |
3ebdb81e KS |
428 | struct udev_device *d = dev; |
429 | ||
430 | if (streq_ptr("partition", udev_device_get_devtype(d))) | |
431 | d = udev_device_get_parent(d); | |
432 | ||
433 | if (d) { | |
434 | fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
435 | if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { | |
56f64d95 | 436 | log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); |
3d06f418 | 437 | fd_lock = safe_close(fd_lock); |
6af5e6a4 | 438 | r = -EAGAIN; |
3ebdb81e KS |
439 | goto skip; |
440 | } | |
441 | } | |
442 | } | |
443 | ||
4c83d994 TG |
444 | /* needed for renaming netifs */ |
445 | udev_event->rtnl = rtnl; | |
446 | ||
912541b0 | 447 | /* apply rules, create node, symlinks */ |
adeba500 KS |
448 | udev_event_execute_rules(udev_event, |
449 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
c0c6806b | 450 | &manager->properties, |
8314de1d | 451 | manager->rules); |
adeba500 KS |
452 | |
453 | udev_event_execute_run(udev_event, | |
8314de1d | 454 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 455 | |
523c620b TG |
456 | if (udev_event->rtnl) |
457 | /* in case rtnl was initialized */ | |
458 | rtnl = sd_rtnl_ref(udev_event->rtnl); | |
4c83d994 | 459 | |
912541b0 | 460 | /* apply/restore inotify watch */ |
bf9bead1 | 461 | if (udev_event->inotify_watch) { |
912541b0 KS |
462 | udev_watch_begin(udev, dev); |
463 | udev_device_update_db(dev); | |
464 | } | |
465 | ||
3d06f418 | 466 | safe_close(fd_lock); |
3ebdb81e | 467 | |
912541b0 KS |
468 | /* send processed event back to libudev listeners */ |
469 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
470 | ||
3ebdb81e | 471 | skip: |
4914cb2d | 472 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 473 | |
912541b0 | 474 | /* send udevd the result of the event execution */ |
e237d8cb | 475 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 476 | if (r < 0) |
9a73bd7c | 477 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 478 | udev_device_get_seqnum(dev)); |
912541b0 KS |
479 | |
480 | udev_device_unref(dev); | |
481 | dev = NULL; | |
482 | ||
73814ca2 | 483 | udev_event_unref(udev_event); |
47e737dc | 484 | |
912541b0 KS |
485 | /* wait for more device messages from main udevd, or term signal */ |
486 | while (dev == NULL) { | |
487 | struct epoll_event ev[4]; | |
488 | int fdcount; | |
489 | int i; | |
490 | ||
8fef0ff2 | 491 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
492 | if (fdcount < 0) { |
493 | if (errno == EINTR) | |
494 | continue; | |
6af5e6a4 | 495 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
496 | goto out; |
497 | } | |
498 | ||
499 | for (i = 0; i < fdcount; i++) { | |
500 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
501 | dev = udev_monitor_receive_device(worker_monitor); | |
502 | break; | |
503 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
504 | struct signalfd_siginfo fdsi; | |
505 | ssize_t size; | |
506 | ||
507 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
508 | if (size != sizeof(struct signalfd_siginfo)) | |
509 | continue; | |
510 | switch (fdsi.ssi_signo) { | |
511 | case SIGTERM: | |
512 | goto out; | |
513 | } | |
514 | } | |
515 | } | |
516 | } | |
517 | } | |
82063a88 | 518 | out: |
912541b0 | 519 | udev_device_unref(dev); |
e237d8cb | 520 | manager_free(manager); |
baa30fbc | 521 | log_close(); |
8b46c3fc | 522 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
523 | } |
524 | case -1: | |
912541b0 | 525 | event->state = EVENT_QUEUED; |
56f64d95 | 526 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
527 | break; |
528 | default: | |
e03c7cc2 TG |
529 | { |
530 | struct worker *worker; | |
3a19b32a | 531 | int r; |
e03c7cc2 | 532 | |
c0c6806b | 533 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 534 | if (r < 0) |
e03c7cc2 | 535 | return; |
e03c7cc2 | 536 | |
39c19cf1 TG |
537 | worker_attach_event(worker, event); |
538 | ||
1fa2f38f | 539 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
540 | break; |
541 | } | |
e03c7cc2 | 542 | } |
7fafc032 KS |
543 | } |
544 | ||
c0c6806b | 545 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
546 | struct worker *worker; |
547 | Iterator i; | |
912541b0 | 548 | |
c0c6806b TG |
549 | assert(manager); |
550 | assert(event); | |
551 | ||
552 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
553 | ssize_t count; |
554 | ||
555 | if (worker->state != WORKER_IDLE) | |
556 | continue; | |
557 | ||
c0c6806b | 558 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 559 | if (count < 0) { |
1fa2f38f ZJS |
560 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
561 | worker->pid, count); | |
912541b0 KS |
562 | kill(worker->pid, SIGKILL); |
563 | worker->state = WORKER_KILLED; | |
564 | continue; | |
565 | } | |
39c19cf1 | 566 | worker_attach_event(worker, event); |
912541b0 KS |
567 | return; |
568 | } | |
569 | ||
c0c6806b | 570 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 571 | if (arg_children_max > 1) |
c0c6806b | 572 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
573 | return; |
574 | } | |
575 | ||
576 | /* start new worker and pass initial device */ | |
c0c6806b | 577 | worker_spawn(manager, event); |
1e03b754 KS |
578 | } |
579 | ||
ecb17862 | 580 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 581 | struct event *event; |
cb49a4f2 | 582 | int r; |
912541b0 | 583 | |
ecb17862 TG |
584 | assert(manager); |
585 | assert(dev); | |
586 | ||
040e6896 TG |
587 | /* only one process can add events to the queue */ |
588 | if (manager->pid == 0) | |
589 | manager->pid = getpid(); | |
590 | ||
cb49a4f2 TG |
591 | assert(manager->pid == getpid()); |
592 | ||
955d98c9 | 593 | event = new0(struct event, 1); |
cb49a4f2 TG |
594 | if (!event) |
595 | return -ENOMEM; | |
912541b0 KS |
596 | |
597 | event->udev = udev_device_get_udev(dev); | |
cb49a4f2 | 598 | event->manager = manager; |
912541b0 | 599 | event->dev = dev; |
6969c349 TG |
600 | event->dev_kernel = udev_device_shallow_clone(dev); |
601 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
602 | event->seqnum = udev_device_get_seqnum(dev); |
603 | event->devpath = udev_device_get_devpath(dev); | |
604 | event->devpath_len = strlen(event->devpath); | |
605 | event->devpath_old = udev_device_get_devpath_old(dev); | |
606 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 607 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
608 | event->ifindex = udev_device_get_ifindex(dev); |
609 | ||
9f6445e3 | 610 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
611 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
612 | ||
613 | event->state = EVENT_QUEUED; | |
cb49a4f2 TG |
614 | |
615 | if (udev_list_node_is_empty(&manager->events)) { | |
616 | r = touch("/run/udev/queue"); | |
617 | if (r < 0) | |
618 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
619 | } | |
620 | ||
ecb17862 | 621 | udev_list_node_append(&event->node, &manager->events); |
cb49a4f2 | 622 | |
912541b0 | 623 | return 0; |
fc465079 KS |
624 | } |
625 | ||
c0c6806b | 626 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
627 | struct worker *worker; |
628 | Iterator i; | |
1e03b754 | 629 | |
c0c6806b TG |
630 | assert(manager); |
631 | ||
632 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
633 | if (worker->state == WORKER_KILLED) |
634 | continue; | |
1e03b754 | 635 | |
912541b0 KS |
636 | worker->state = WORKER_KILLED; |
637 | kill(worker->pid, SIGTERM); | |
638 | } | |
1e03b754 KS |
639 | } |
640 | ||
e3196993 | 641 | /* lookup event for identical, parent, child device */ |
ecb17862 | 642 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
912541b0 KS |
643 | struct udev_list_node *loop; |
644 | size_t common; | |
645 | ||
646 | /* check if queue contains events we depend on */ | |
ecb17862 | 647 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 KS |
648 | struct event *loop_event = node_to_event(loop); |
649 | ||
650 | /* we already found a later event, earlier can not block us, no need to check again */ | |
651 | if (loop_event->seqnum < event->delaying_seqnum) | |
652 | continue; | |
653 | ||
654 | /* event we checked earlier still exists, no need to check again */ | |
655 | if (loop_event->seqnum == event->delaying_seqnum) | |
656 | return true; | |
657 | ||
658 | /* found ourself, no later event can block us */ | |
659 | if (loop_event->seqnum >= event->seqnum) | |
660 | break; | |
661 | ||
662 | /* check major/minor */ | |
663 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
664 | return true; | |
665 | ||
666 | /* check network device ifindex */ | |
667 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
668 | return true; | |
669 | ||
670 | /* check our old name */ | |
090be865 | 671 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
672 | event->delaying_seqnum = loop_event->seqnum; |
673 | return true; | |
674 | } | |
675 | ||
676 | /* compare devpath */ | |
677 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
678 | ||
679 | /* one devpath is contained in the other? */ | |
680 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
681 | continue; | |
682 | ||
683 | /* identical device event found */ | |
684 | if (loop_event->devpath_len == event->devpath_len) { | |
685 | /* devices names might have changed/swapped in the meantime */ | |
686 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
687 | continue; | |
688 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
689 | continue; | |
690 | event->delaying_seqnum = loop_event->seqnum; | |
691 | return true; | |
692 | } | |
693 | ||
694 | /* parent device event found */ | |
695 | if (event->devpath[common] == '/') { | |
696 | event->delaying_seqnum = loop_event->seqnum; | |
697 | return true; | |
698 | } | |
699 | ||
700 | /* child device event found */ | |
701 | if (loop_event->devpath[common] == '/') { | |
702 | event->delaying_seqnum = loop_event->seqnum; | |
703 | return true; | |
704 | } | |
705 | ||
706 | /* no matching device */ | |
707 | continue; | |
708 | } | |
709 | ||
710 | return false; | |
7fafc032 KS |
711 | } |
712 | ||
693d371d TG |
713 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
714 | Manager *manager = userdata; | |
715 | ||
716 | assert(manager); | |
717 | ||
718 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
719 | ||
720 | sd_event_exit(manager->event, -ETIMEDOUT); | |
721 | ||
722 | return 1; | |
723 | } | |
724 | ||
62d43dac | 725 | static void manager_exit(Manager *manager) { |
693d371d TG |
726 | uint64_t usec; |
727 | int r; | |
62d43dac TG |
728 | |
729 | assert(manager); | |
730 | ||
731 | manager->exit = true; | |
732 | ||
b79aacbf TG |
733 | sd_notify(false, |
734 | "STOPPING=1\n" | |
735 | "STATUS=Starting shutdown..."); | |
736 | ||
62d43dac | 737 | /* close sources of new events and discard buffered events */ |
693d371d TG |
738 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
739 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); | |
62d43dac | 740 | |
693d371d TG |
741 | manager->fd_inotify = safe_close(manager->fd_inotify); |
742 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
62d43dac | 743 | |
693d371d TG |
744 | manager->monitor = udev_monitor_unref(manager->monitor); |
745 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
62d43dac TG |
746 | |
747 | /* discard queued events and kill workers */ | |
748 | event_queue_cleanup(manager, EVENT_QUEUED); | |
749 | manager_kill_workers(manager); | |
693d371d TG |
750 | |
751 | r = sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec); | |
752 | if (r < 0) | |
753 | return; | |
754 | ||
755 | r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), | |
756 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); | |
757 | if (r < 0) | |
758 | return; | |
62d43dac TG |
759 | } |
760 | ||
761 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
762 | static void manager_reload(Manager *manager) { | |
763 | ||
764 | assert(manager); | |
765 | ||
b79aacbf TG |
766 | sd_notify(false, |
767 | "RELOADING=1\n" | |
768 | "STATUS=Flushing configuration..."); | |
769 | ||
62d43dac TG |
770 | manager_kill_workers(manager); |
771 | manager->rules = udev_rules_unref(manager->rules); | |
772 | udev_builtin_exit(manager->udev); | |
b79aacbf TG |
773 | |
774 | sd_notify(false, | |
775 | "READY=1\n" | |
776 | "STATUS=Processing..."); | |
62d43dac TG |
777 | } |
778 | ||
c0c6806b | 779 | static void event_queue_start(Manager *manager) { |
912541b0 | 780 | struct udev_list_node *loop; |
693d371d TG |
781 | usec_t usec; |
782 | int r; | |
8ab44e3f | 783 | |
c0c6806b TG |
784 | assert(manager); |
785 | ||
7c4c7e89 TG |
786 | if (udev_list_node_is_empty(&manager->events) || |
787 | manager->exit || manager->stop_exec_queue) | |
788 | return; | |
789 | ||
693d371d TG |
790 | r = sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec); |
791 | if (r >= 0) { | |
792 | /* check for changed config, every 3 seconds at most */ | |
793 | if (manager->last_usec == 0 || | |
794 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
795 | if (udev_rules_check_timestamp(manager->rules) || | |
796 | udev_builtin_validate(manager->udev)) | |
797 | manager_reload(manager); | |
798 | ||
799 | manager->last_usec = usec; | |
800 | } | |
7c4c7e89 TG |
801 | } |
802 | ||
803 | udev_builtin_init(manager->udev); | |
804 | ||
805 | if (!manager->rules) { | |
806 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
807 | if (!manager->rules) | |
808 | return; | |
809 | } | |
810 | ||
ecb17862 | 811 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 | 812 | struct event *event = node_to_event(loop); |
0bc74ea7 | 813 | |
912541b0 KS |
814 | if (event->state != EVENT_QUEUED) |
815 | continue; | |
0bc74ea7 | 816 | |
912541b0 | 817 | /* do not start event if parent or child event is still running */ |
ecb17862 | 818 | if (is_devpath_busy(manager, event)) |
912541b0 | 819 | continue; |
fc465079 | 820 | |
c0c6806b | 821 | event_run(manager, event); |
912541b0 | 822 | } |
1e03b754 KS |
823 | } |
824 | ||
ecb17862 | 825 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
912541b0 | 826 | struct udev_list_node *loop, *tmp; |
ff2c503d | 827 | |
ecb17862 | 828 | udev_list_node_foreach_safe(loop, tmp, &manager->events) { |
912541b0 | 829 | struct event *event = node_to_event(loop); |
ff2c503d | 830 | |
912541b0 KS |
831 | if (match_type != EVENT_UNDEF && match_type != event->state) |
832 | continue; | |
ff2c503d | 833 | |
c6aa11f2 | 834 | event_free(event); |
912541b0 | 835 | } |
ff2c503d KS |
836 | } |
837 | ||
e82e8fa5 | 838 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
839 | Manager *manager = userdata; |
840 | ||
841 | assert(manager); | |
842 | ||
912541b0 KS |
843 | for (;;) { |
844 | struct worker_message msg; | |
979558f3 TG |
845 | struct iovec iovec = { |
846 | .iov_base = &msg, | |
847 | .iov_len = sizeof(msg), | |
848 | }; | |
849 | union { | |
850 | struct cmsghdr cmsghdr; | |
851 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
852 | } control = {}; | |
853 | struct msghdr msghdr = { | |
854 | .msg_iov = &iovec, | |
855 | .msg_iovlen = 1, | |
856 | .msg_control = &control, | |
857 | .msg_controllen = sizeof(control), | |
858 | }; | |
859 | struct cmsghdr *cmsg; | |
912541b0 | 860 | ssize_t size; |
979558f3 | 861 | struct ucred *ucred = NULL; |
a505965d | 862 | struct worker *worker; |
912541b0 | 863 | |
e82e8fa5 | 864 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 865 | if (size < 0) { |
738a7907 TG |
866 | if (errno == EINTR) |
867 | continue; | |
868 | else if (errno == EAGAIN) | |
869 | /* nothing more to read */ | |
870 | break; | |
979558f3 | 871 | |
e82e8fa5 | 872 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
873 | } else if (size != sizeof(struct worker_message)) { |
874 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 875 | continue; |
979558f3 TG |
876 | } |
877 | ||
878 | for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg; cmsg = CMSG_NXTHDR(&msghdr, cmsg)) { | |
879 | if (cmsg->cmsg_level == SOL_SOCKET && | |
880 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
881 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
882 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
883 | } | |
884 | ||
885 | if (!ucred || ucred->pid <= 0) { | |
886 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
887 | continue; | |
888 | } | |
912541b0 KS |
889 | |
890 | /* lookup worker who sent the signal */ | |
c0c6806b | 891 | worker = hashmap_get(manager->workers, UINT_TO_PTR(ucred->pid)); |
a505965d TG |
892 | if (!worker) { |
893 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
894 | continue; | |
912541b0 | 895 | } |
c0bbfd72 | 896 | |
a505965d TG |
897 | if (worker->state != WORKER_KILLED) |
898 | worker->state = WORKER_IDLE; | |
899 | ||
900 | /* worker returned */ | |
901 | event_free(worker->event); | |
912541b0 | 902 | } |
e82e8fa5 | 903 | |
8302fe5a TG |
904 | /* we have free workers, try to schedule events */ |
905 | event_queue_start(manager); | |
906 | ||
e82e8fa5 TG |
907 | return 1; |
908 | } | |
909 | ||
910 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 911 | Manager *manager = userdata; |
e82e8fa5 TG |
912 | struct udev_device *dev; |
913 | int r; | |
914 | ||
c0c6806b | 915 | assert(manager); |
e82e8fa5 | 916 | |
c0c6806b | 917 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
918 | if (dev) { |
919 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 920 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
921 | if (r < 0) |
922 | udev_device_unref(dev); | |
8302fe5a TG |
923 | else |
924 | /* we have fresh events, try to schedule them */ | |
925 | event_queue_start(manager); | |
e82e8fa5 TG |
926 | } |
927 | ||
928 | return 1; | |
88f4b648 KS |
929 | } |
930 | ||
3b47c739 | 931 | /* receive the udevd message from userspace */ |
e82e8fa5 | 932 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 933 | Manager *manager = userdata; |
e4f66b77 TG |
934 | _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; |
935 | _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 KS |
936 | const char *str; |
937 | int i; | |
938 | ||
c0c6806b | 939 | assert(manager); |
e4f66b77 | 940 | |
c0c6806b | 941 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 942 | if (!ctrl_conn) |
e82e8fa5 | 943 | return 1; |
912541b0 KS |
944 | |
945 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 946 | if (!ctrl_msg) |
e82e8fa5 | 947 | return 1; |
912541b0 KS |
948 | |
949 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
950 | if (i >= 0) { | |
ed14edc0 | 951 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 952 | log_set_max_level(i); |
c0c6806b | 953 | manager_kill_workers(manager); |
912541b0 KS |
954 | } |
955 | ||
956 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 957 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 958 | manager->stop_exec_queue = true; |
912541b0 KS |
959 | } |
960 | ||
961 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 962 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 963 | manager->stop_exec_queue = false; |
8302fe5a | 964 | event_queue_start(manager); |
912541b0 KS |
965 | } |
966 | ||
967 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 968 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 969 | manager_reload(manager); |
912541b0 KS |
970 | } |
971 | ||
972 | str = udev_ctrl_get_set_env(ctrl_msg); | |
973 | if (str != NULL) { | |
c0c6806b | 974 | _cleanup_free_ char *key = NULL; |
912541b0 KS |
975 | |
976 | key = strdup(str); | |
c0c6806b | 977 | if (key) { |
912541b0 KS |
978 | char *val; |
979 | ||
980 | val = strchr(key, '='); | |
981 | if (val != NULL) { | |
982 | val[0] = '\0'; | |
983 | val = &val[1]; | |
984 | if (val[0] == '\0') { | |
9f6445e3 | 985 | log_debug("udevd message (ENV) received, unset '%s'", key); |
c0c6806b | 986 | udev_list_entry_add(&manager->properties, key, NULL); |
912541b0 | 987 | } else { |
9f6445e3 | 988 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); |
c0c6806b | 989 | udev_list_entry_add(&manager->properties, key, val); |
912541b0 | 990 | } |
c0c6806b | 991 | } else |
9f6445e3 | 992 | log_error("wrong key format '%s'", key); |
912541b0 | 993 | } |
c0c6806b | 994 | manager_kill_workers(manager); |
912541b0 KS |
995 | } |
996 | ||
997 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
998 | if (i >= 0) { | |
9f6445e3 | 999 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 1000 | arg_children_max = i; |
912541b0 KS |
1001 | } |
1002 | ||
cb49a4f2 | 1003 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1004 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1005 | |
1006 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1007 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1008 | manager_exit(manager); |
c0c6806b TG |
1009 | /* keep reference to block the client until we exit |
1010 | TODO: deal with several blocking exit requests */ | |
1011 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1012 | } |
e4f66b77 | 1013 | |
e82e8fa5 | 1014 | return 1; |
88f4b648 | 1015 | } |
4a231017 | 1016 | |
f3a740a5 | 1017 | static int synthesize_change(struct udev_device *dev) { |
edd32000 | 1018 | char filename[UTIL_PATH_SIZE]; |
f3a740a5 | 1019 | int r; |
edd32000 | 1020 | |
f3a740a5 | 1021 | if (streq_ptr("block", udev_device_get_subsystem(dev)) && |
ede34445 | 1022 | streq_ptr("disk", udev_device_get_devtype(dev)) && |
638ca89c | 1023 | !startswith(udev_device_get_sysname(dev), "dm-")) { |
e9fc29f4 KS |
1024 | bool part_table_read = false; |
1025 | bool has_partitions = false; | |
ede34445 | 1026 | int fd; |
f3a740a5 KS |
1027 | struct udev *udev = udev_device_get_udev(dev); |
1028 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
1029 | struct udev_list_entry *item; | |
1030 | ||
ede34445 | 1031 | /* |
e9fc29f4 KS |
1032 | * Try to re-read the partition table. This only succeeds if |
1033 | * none of the devices is busy. The kernel returns 0 if no | |
1034 | * partition table is found, and we will not get an event for | |
1035 | * the disk. | |
ede34445 | 1036 | */ |
02ba8fb3 | 1037 | fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1038 | if (fd >= 0) { |
02ba8fb3 KS |
1039 | r = flock(fd, LOCK_EX|LOCK_NB); |
1040 | if (r >= 0) | |
1041 | r = ioctl(fd, BLKRRPART, 0); | |
1042 | ||
ede34445 KS |
1043 | close(fd); |
1044 | if (r >= 0) | |
e9fc29f4 | 1045 | part_table_read = true; |
ede34445 KS |
1046 | } |
1047 | ||
e9fc29f4 | 1048 | /* search for partitions */ |
f3a740a5 KS |
1049 | e = udev_enumerate_new(udev); |
1050 | if (!e) | |
1051 | return -ENOMEM; | |
1052 | ||
1053 | r = udev_enumerate_add_match_parent(e, dev); | |
1054 | if (r < 0) | |
1055 | return r; | |
1056 | ||
1057 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
1058 | if (r < 0) | |
1059 | return r; | |
1060 | ||
1061 | r = udev_enumerate_scan_devices(e); | |
47a3fa0f TA |
1062 | if (r < 0) |
1063 | return r; | |
e9fc29f4 KS |
1064 | |
1065 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1066 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1067 | ||
1068 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1069 | if (!d) | |
1070 | continue; | |
1071 | ||
1072 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1073 | continue; | |
1074 | ||
1075 | has_partitions = true; | |
1076 | break; | |
1077 | } | |
1078 | ||
1079 | /* | |
1080 | * We have partitions and re-read the table, the kernel already sent | |
1081 | * out a "change" event for the disk, and "remove/add" for all | |
1082 | * partitions. | |
1083 | */ | |
1084 | if (part_table_read && has_partitions) | |
1085 | return 0; | |
1086 | ||
1087 | /* | |
1088 | * We have partitions but re-reading the partition table did not | |
1089 | * work, synthesize "change" for the disk and all partitions. | |
1090 | */ | |
1091 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1092 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
1093 | write_string_file(filename, "change"); | |
1094 | ||
f3a740a5 KS |
1095 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { |
1096 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1097 | ||
1098 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1099 | if (!d) | |
1100 | continue; | |
1101 | ||
1102 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1103 | continue; | |
1104 | ||
1105 | log_debug("device %s closed, synthesising partition '%s' 'change'", | |
1106 | udev_device_get_devnode(dev), udev_device_get_devnode(d)); | |
1107 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); | |
1108 | write_string_file(filename, "change"); | |
1109 | } | |
ede34445 KS |
1110 | |
1111 | return 0; | |
f3a740a5 KS |
1112 | } |
1113 | ||
ede34445 KS |
1114 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); |
1115 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
1116 | write_string_file(filename, "change"); | |
1117 | ||
f3a740a5 | 1118 | return 0; |
edd32000 KS |
1119 | } |
1120 | ||
e82e8fa5 | 1121 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1122 | Manager *manager = userdata; |
0254e944 | 1123 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1124 | struct inotify_event *e; |
1125 | ssize_t l; | |
912541b0 | 1126 | |
c0c6806b | 1127 | assert(manager); |
e82e8fa5 TG |
1128 | |
1129 | l = read(fd, &buffer, sizeof(buffer)); | |
f7c1ad4f LP |
1130 | if (l < 0) { |
1131 | if (errno == EAGAIN || errno == EINTR) | |
e82e8fa5 | 1132 | return 1; |
912541b0 | 1133 | |
f7c1ad4f | 1134 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1135 | } |
1136 | ||
f7c1ad4f | 1137 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
e82e8fa5 | 1138 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; |
912541b0 | 1139 | |
c0c6806b | 1140 | dev = udev_watch_lookup(manager->udev, e->wd); |
edd32000 KS |
1141 | if (!dev) |
1142 | continue; | |
912541b0 | 1143 | |
f7c1ad4f | 1144 | log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); |
a8389097 | 1145 | if (e->mask & IN_CLOSE_WRITE) { |
edd32000 | 1146 | synthesize_change(dev); |
a8389097 TG |
1147 | |
1148 | /* settle might be waiting on us to determine the queue | |
1149 | * state. If we just handled an inotify event, we might have | |
1150 | * generated a "change" event, but we won't have queued up | |
1151 | * the resultant uevent yet. Do that. | |
1152 | */ | |
c0c6806b | 1153 | on_uevent(NULL, -1, 0, manager); |
a8389097 | 1154 | } else if (e->mask & IN_IGNORED) |
c0c6806b | 1155 | udev_watch_end(manager->udev, dev); |
912541b0 KS |
1156 | } |
1157 | ||
e82e8fa5 | 1158 | return 1; |
bd284db1 SJR |
1159 | } |
1160 | ||
0561329d | 1161 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1162 | Manager *manager = userdata; |
1163 | ||
1164 | assert(manager); | |
1165 | ||
62d43dac | 1166 | manager_exit(manager); |
912541b0 | 1167 | |
e82e8fa5 TG |
1168 | return 1; |
1169 | } | |
912541b0 | 1170 | |
0561329d | 1171 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1172 | Manager *manager = userdata; |
1173 | ||
1174 | assert(manager); | |
1175 | ||
62d43dac | 1176 | manager_reload(manager); |
912541b0 | 1177 | |
e82e8fa5 TG |
1178 | return 1; |
1179 | } | |
912541b0 | 1180 | |
e82e8fa5 | 1181 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1182 | Manager *manager = userdata; |
1183 | ||
1184 | assert(manager); | |
1185 | ||
e82e8fa5 TG |
1186 | for (;;) { |
1187 | pid_t pid; | |
1188 | int status; | |
1189 | struct worker *worker; | |
d1317d02 | 1190 | |
e82e8fa5 TG |
1191 | pid = waitpid(-1, &status, WNOHANG); |
1192 | if (pid <= 0) | |
f29328d6 | 1193 | break; |
e82e8fa5 | 1194 | |
c0c6806b | 1195 | worker = hashmap_get(manager->workers, UINT_TO_PTR(pid)); |
e82e8fa5 TG |
1196 | if (!worker) { |
1197 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1198 | continue; |
912541b0 | 1199 | } |
e82e8fa5 TG |
1200 | |
1201 | if (WIFEXITED(status)) { | |
1202 | if (WEXITSTATUS(status) == 0) | |
1203 | log_debug("worker ["PID_FMT"] exited", pid); | |
1204 | else | |
1205 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1206 | } else if (WIFSIGNALED(status)) { | |
1207 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); | |
1208 | } else if (WIFSTOPPED(status)) { | |
1209 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1210 | continue; |
e82e8fa5 TG |
1211 | } else if (WIFCONTINUED(status)) { |
1212 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1213 | continue; |
e82e8fa5 TG |
1214 | } else |
1215 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1216 | ||
1217 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1218 | if (worker->event) { | |
1219 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1220 | /* delete state from disk */ | |
1221 | udev_device_delete_db(worker->event->dev); | |
1222 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1223 | /* forward kernel event without amending it */ | |
c0c6806b | 1224 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); |
e82e8fa5 TG |
1225 | } |
1226 | } | |
1227 | ||
1228 | worker_free(worker); | |
912541b0 | 1229 | } |
e82e8fa5 | 1230 | |
8302fe5a TG |
1231 | /* we can start new workers, try to schedule events */ |
1232 | event_queue_start(manager); | |
1233 | ||
e82e8fa5 | 1234 | return 1; |
f27125f9 | 1235 | } |
1236 | ||
693d371d TG |
1237 | static int on_post(sd_event_source *s, void *userdata) { |
1238 | Manager *manager = userdata; | |
1239 | int r; | |
1240 | ||
1241 | assert(manager); | |
1242 | ||
1243 | if (udev_list_node_is_empty(&manager->events)) { | |
1244 | /* no pending events */ | |
1245 | if (!hashmap_isempty(manager->workers)) { | |
1246 | /* there are idle workers */ | |
1247 | log_debug("cleanup idle workers"); | |
1248 | manager_kill_workers(manager); | |
1249 | } else { | |
1250 | /* we are idle */ | |
1251 | if (manager->exit) { | |
1252 | r = sd_event_exit(manager->event, 0); | |
1253 | if (r < 0) | |
1254 | return r; | |
1255 | } else if (manager->cgroup) | |
1256 | /* cleanup possible left-over processes in our cgroup */ | |
1257 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, false, true, NULL); | |
1258 | } | |
1259 | } | |
1260 | ||
1261 | return 1; | |
1262 | } | |
1263 | ||
fcff1e72 TG |
1264 | static int listen_fds(int *rctrl, int *rnetlink) { |
1265 | int ctrl_fd = -1, netlink_fd = -1; | |
912541b0 KS |
1266 | int fd, n; |
1267 | ||
fcff1e72 TG |
1268 | assert(rctrl); |
1269 | assert(rnetlink); | |
1270 | ||
912541b0 | 1271 | n = sd_listen_fds(true); |
fcff1e72 TG |
1272 | if (n < 0) |
1273 | return n; | |
912541b0 KS |
1274 | |
1275 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1276 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1277 | if (ctrl_fd >= 0) |
1278 | return -EINVAL; | |
1279 | ctrl_fd = fd; | |
912541b0 KS |
1280 | continue; |
1281 | } | |
1282 | ||
1283 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1284 | if (netlink_fd >= 0) |
1285 | return -EINVAL; | |
1286 | netlink_fd = fd; | |
912541b0 KS |
1287 | continue; |
1288 | } | |
1289 | ||
fcff1e72 | 1290 | return -EINVAL; |
912541b0 KS |
1291 | } |
1292 | ||
fcff1e72 TG |
1293 | if (ctrl_fd < 0 || netlink_fd < 0) |
1294 | return -EINVAL; | |
1295 | ||
1296 | log_debug("ctrl=%i netlink=%i", ctrl_fd, netlink_fd); | |
1297 | ||
1298 | *rctrl = ctrl_fd; | |
1299 | *rnetlink = netlink_fd; | |
912541b0 | 1300 | |
912541b0 | 1301 | return 0; |
7459bcdc KS |
1302 | } |
1303 | ||
e6f86cac | 1304 | /* |
3f85ef0f | 1305 | * read the kernel command line, in case we need to get into debug mode |
614a823c TG |
1306 | * udev.log-priority=<level> syslog priority |
1307 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1308 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1309 | * udev.event-timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1310 | */ |
614a823c | 1311 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
74df0fca | 1312 | int r; |
e6f86cac | 1313 | |
614a823c | 1314 | assert(key); |
e6f86cac | 1315 | |
614a823c TG |
1316 | if (!value) |
1317 | return 0; | |
e6f86cac | 1318 | |
614a823c TG |
1319 | if (startswith(key, "rd.")) |
1320 | key += strlen("rd."); | |
e6f86cac | 1321 | |
614a823c TG |
1322 | if (startswith(key, "udev.")) |
1323 | key += strlen("udev."); | |
1324 | else | |
1325 | return 0; | |
e6f86cac | 1326 | |
614a823c TG |
1327 | if (streq(key, "log-priority")) { |
1328 | int prio; | |
e6f86cac | 1329 | |
614a823c TG |
1330 | prio = util_log_priority(value); |
1331 | log_set_max_level(prio); | |
1332 | } else if (streq(key, "children-max")) { | |
020328e1 | 1333 | r = safe_atou(value, &arg_children_max); |
614a823c TG |
1334 | if (r < 0) |
1335 | log_warning("invalid udev.children-max ignored: %s", value); | |
1336 | } else if (streq(key, "exec-delay")) { | |
1337 | r = safe_atoi(value, &arg_exec_delay); | |
1338 | if (r < 0) | |
1339 | log_warning("invalid udev.exec-delay ignored: %s", value); | |
1340 | } else if (streq(key, "event-timeout")) { | |
1341 | r = safe_atou64(value, &arg_event_timeout_usec); | |
1342 | if (r < 0) | |
1343 | log_warning("invalid udev.event-timeout ignored: %s", value); | |
1344 | else { | |
f1e8664e | 1345 | arg_event_timeout_usec *= USEC_PER_SEC; |
bba7a484 | 1346 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; |
023b9d33 | 1347 | } |
e6f86cac | 1348 | } |
614a823c TG |
1349 | |
1350 | return 0; | |
e6f86cac KS |
1351 | } |
1352 | ||
ed216e1f TG |
1353 | static void help(void) { |
1354 | printf("%s [OPTIONS...]\n\n" | |
1355 | "Manages devices.\n\n" | |
5ac0162c LP |
1356 | " -h --help Print this message\n" |
1357 | " --version Print version of the program\n" | |
1358 | " --daemon Detach and run in the background\n" | |
1359 | " --debug Enable debug output\n" | |
1360 | " --children-max=INT Set maximum number of workers\n" | |
1361 | " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1362 | " --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1363 | " --resolve-names=early|late|never\n" | |
1364 | " When to resolve users and groups\n" | |
ed216e1f TG |
1365 | , program_invocation_short_name); |
1366 | } | |
1367 | ||
bba7a484 | 1368 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1369 | static const struct option options[] = { |
bba7a484 TG |
1370 | { "daemon", no_argument, NULL, 'd' }, |
1371 | { "debug", no_argument, NULL, 'D' }, | |
1372 | { "children-max", required_argument, NULL, 'c' }, | |
1373 | { "exec-delay", required_argument, NULL, 'e' }, | |
1374 | { "event-timeout", required_argument, NULL, 't' }, | |
1375 | { "resolve-names", required_argument, NULL, 'N' }, | |
1376 | { "help", no_argument, NULL, 'h' }, | |
1377 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1378 | {} |
1379 | }; | |
689a97f5 | 1380 | |
bba7a484 | 1381 | int c; |
689a97f5 | 1382 | |
bba7a484 TG |
1383 | assert(argc >= 0); |
1384 | assert(argv); | |
912541b0 | 1385 | |
bba7a484 | 1386 | while ((c = getopt_long(argc, argv, "c:de:DtN:hV", options, NULL)) >= 0) { |
f1e8664e | 1387 | int r; |
912541b0 | 1388 | |
bba7a484 | 1389 | switch (c) { |
912541b0 | 1390 | |
912541b0 | 1391 | case 'd': |
bba7a484 | 1392 | arg_daemonize = true; |
912541b0 KS |
1393 | break; |
1394 | case 'c': | |
020328e1 | 1395 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1396 | if (r < 0) |
1397 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1398 | break; |
1399 | case 'e': | |
6f5cf8a8 TG |
1400 | r = safe_atoi(optarg, &arg_exec_delay); |
1401 | if (r < 0) | |
1402 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1403 | break; |
9719859c | 1404 | case 't': |
f1e8664e TG |
1405 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1406 | if (r < 0) | |
65fea570 | 1407 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1408 | else { |
1409 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1410 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1411 | } | |
9719859c | 1412 | break; |
912541b0 | 1413 | case 'D': |
bba7a484 | 1414 | arg_debug = true; |
912541b0 KS |
1415 | break; |
1416 | case 'N': | |
090be865 | 1417 | if (streq(optarg, "early")) { |
bba7a484 | 1418 | arg_resolve_names = 1; |
090be865 | 1419 | } else if (streq(optarg, "late")) { |
bba7a484 | 1420 | arg_resolve_names = 0; |
090be865 | 1421 | } else if (streq(optarg, "never")) { |
bba7a484 | 1422 | arg_resolve_names = -1; |
912541b0 | 1423 | } else { |
9f6445e3 | 1424 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1425 | return 0; |
912541b0 KS |
1426 | } |
1427 | break; | |
1428 | case 'h': | |
ed216e1f | 1429 | help(); |
bba7a484 | 1430 | return 0; |
912541b0 KS |
1431 | case 'V': |
1432 | printf("%s\n", VERSION); | |
bba7a484 TG |
1433 | return 0; |
1434 | case '?': | |
1435 | return -EINVAL; | |
912541b0 | 1436 | default: |
bba7a484 TG |
1437 | assert_not_reached("Unhandled option"); |
1438 | ||
912541b0 KS |
1439 | } |
1440 | } | |
1441 | ||
bba7a484 TG |
1442 | return 1; |
1443 | } | |
1444 | ||
c26d1879 | 1445 | static int manager_new(Manager **ret, const char *cgroup) { |
c0c6806b | 1446 | _cleanup_(manager_freep) Manager *manager = NULL; |
3d7dc8e4 | 1447 | int r, fd_ctrl, fd_uevent; |
c0c6806b TG |
1448 | |
1449 | assert(ret); | |
1450 | ||
1451 | manager = new0(Manager, 1); | |
1452 | if (!manager) | |
1453 | return log_oom(); | |
1454 | ||
e237d8cb TG |
1455 | manager->fd_inotify = -1; |
1456 | manager->worker_watch[WRITE_END] = -1; | |
1457 | manager->worker_watch[READ_END] = -1; | |
1458 | ||
c0c6806b TG |
1459 | manager->udev = udev_new(); |
1460 | if (!manager->udev) | |
1461 | return log_error_errno(errno, "could not allocate udev context: %m"); | |
1462 | ||
b2d21d93 TG |
1463 | udev_builtin_init(manager->udev); |
1464 | ||
ecb17862 TG |
1465 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); |
1466 | if (!manager->rules) | |
1467 | return log_error_errno(ENOMEM, "error reading rules"); | |
1468 | ||
1469 | udev_list_node_init(&manager->events); | |
1470 | udev_list_init(manager->udev, &manager->properties, true); | |
1471 | ||
c26d1879 TG |
1472 | manager->cgroup = cgroup; |
1473 | ||
fcff1e72 | 1474 | r = listen_fds(&fd_ctrl, &fd_uevent); |
e237d8cb TG |
1475 | if (r >= 0) { |
1476 | /* get control and netlink socket from systemd */ | |
693d371d | 1477 | manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); |
e237d8cb TG |
1478 | if (!manager->ctrl) |
1479 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
1480 | ||
693d371d | 1481 | manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); |
e237d8cb TG |
1482 | if (!manager->monitor) |
1483 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1484 | } else { |
1485 | /* open control and netlink socket */ | |
1486 | manager->ctrl = udev_ctrl_new(manager->udev); | |
1487 | if (!manager->ctrl) | |
1488 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1489 | ||
693d371d | 1490 | fd_ctrl = udev_ctrl_get_fd(manager->ctrl); |
e237d8cb TG |
1491 | |
1492 | manager->monitor = udev_monitor_new_from_netlink(manager->udev, "kernel"); | |
1493 | if (!manager->monitor) | |
1494 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1495 | ||
693d371d | 1496 | fd_uevent = udev_monitor_get_fd(manager->monitor); |
e237d8cb TG |
1497 | |
1498 | (void) udev_monitor_set_receive_buffer_size(manager->monitor, 128 * 1024 * 1024); | |
e237d8cb | 1499 | |
bf687163 TG |
1500 | r = udev_monitor_enable_receiving(manager->monitor); |
1501 | if (r < 0) | |
1502 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
e237d8cb | 1503 | |
bf687163 TG |
1504 | r = udev_ctrl_enable_receiving(manager->ctrl); |
1505 | if (r < 0) | |
1506 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1507 | } | |
e237d8cb | 1508 | |
3d7dc8e4 TG |
1509 | *ret = manager; |
1510 | manager = NULL; | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static int manager_listen(Manager *manager) { | |
3d7dc8e4 TG |
1516 | int r, fd_worker, one = 1; |
1517 | ||
1518 | assert(manager); | |
1519 | ||
e237d8cb TG |
1520 | /* unnamed socket from workers to the main daemon */ |
1521 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1522 | if (r < 0) | |
1523 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1524 | ||
693d371d | 1525 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1526 | |
693d371d | 1527 | r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
e237d8cb TG |
1528 | if (r < 0) |
1529 | return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); | |
1530 | ||
1531 | manager->fd_inotify = udev_watch_init(manager->udev); | |
1532 | if (manager->fd_inotify < 0) | |
1533 | return log_error_errno(ENOMEM, "error initializing inotify"); | |
1534 | ||
1535 | udev_watch_restore(manager->udev); | |
1536 | ||
1537 | /* block and listen to all signals on signalfd */ | |
8314de1d | 1538 | assert_se(sigprocmask_many(SIG_BLOCK, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) == 0); |
693d371d | 1539 | |
49f997f3 TG |
1540 | r = sd_event_default(&manager->event); |
1541 | if (r < 0) | |
1542 | return log_error_errno(errno, "could not allocate event loop: %m"); | |
1543 | ||
693d371d TG |
1544 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1545 | if (r < 0) | |
1546 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1547 | ||
1548 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1549 | if (r < 0) | |
1550 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1551 | ||
1552 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1553 | if (r < 0) | |
1554 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1555 | ||
1556 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1557 | if (r < 0) | |
1558 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1559 | ||
1560 | r = sd_event_set_watchdog(manager->event, true); | |
1561 | if (r < 0) | |
1562 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1563 | ||
3d7dc8e4 | 1564 | r = sd_event_add_io(manager->event, &manager->ctrl_event, udev_ctrl_get_fd(manager->ctrl), EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1565 | if (r < 0) |
1566 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1567 | ||
1568 | /* This needs to be after the inotify and uevent handling, to make sure | |
1569 | * that the ping is send back after fully processing the pending uevents | |
1570 | * (including the synthetic ones we may create due to inotify events). | |
1571 | */ | |
1572 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1573 | if (r < 0) | |
1574 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1575 | ||
1576 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1577 | if (r < 0) | |
1578 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1579 | ||
3d7dc8e4 | 1580 | r = sd_event_add_io(manager->event, &manager->uevent_event, udev_monitor_get_fd(manager->monitor), EPOLLIN, on_uevent, manager); |
693d371d TG |
1581 | if (r < 0) |
1582 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1583 | ||
1584 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1585 | if (r < 0) | |
1586 | return log_error_errno(r, "error creating worker event source: %m"); | |
1587 | ||
1588 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1589 | if (r < 0) | |
1590 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1591 | |
86c3bece | 1592 | return 0; |
c0c6806b TG |
1593 | } |
1594 | ||
bba7a484 | 1595 | int main(int argc, char *argv[]) { |
c0c6806b | 1596 | _cleanup_(manager_freep) Manager *manager = NULL; |
c26d1879 | 1597 | _cleanup_free_ char *cgroup = NULL; |
e237d8cb | 1598 | int r; |
bba7a484 | 1599 | |
bba7a484 TG |
1600 | log_set_target(LOG_TARGET_AUTO); |
1601 | log_parse_environment(); | |
1602 | log_open(); | |
1603 | ||
bba7a484 TG |
1604 | r = parse_argv(argc, argv); |
1605 | if (r <= 0) | |
1606 | goto exit; | |
1607 | ||
614a823c TG |
1608 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
1609 | if (r < 0) | |
1610 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1611 | |
25e773ee | 1612 | if (arg_debug) |
bba7a484 | 1613 | log_set_max_level(LOG_DEBUG); |
bba7a484 | 1614 | |
912541b0 | 1615 | if (getuid() != 0) { |
6af5e6a4 | 1616 | r = log_error_errno(EPERM, "root privileges required"); |
912541b0 KS |
1617 | goto exit; |
1618 | } | |
1619 | ||
712cebf1 TG |
1620 | if (arg_children_max == 0) { |
1621 | cpu_set_t cpu_set; | |
ebc164ef | 1622 | |
712cebf1 | 1623 | arg_children_max = 8; |
d457ff83 | 1624 | |
712cebf1 TG |
1625 | if (sched_getaffinity(0, sizeof (cpu_set), &cpu_set) == 0) { |
1626 | arg_children_max += CPU_COUNT(&cpu_set) * 2; | |
1627 | } | |
912541b0 | 1628 | |
712cebf1 | 1629 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1630 | } |
912541b0 | 1631 | |
712cebf1 TG |
1632 | /* set umask before creating any file/directory */ |
1633 | r = chdir("/"); | |
1634 | if (r < 0) { | |
1635 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1636 | goto exit; | |
1637 | } | |
194bbe33 | 1638 | |
712cebf1 | 1639 | umask(022); |
912541b0 | 1640 | |
712cebf1 TG |
1641 | r = mac_selinux_init("/dev"); |
1642 | if (r < 0) { | |
1643 | log_error_errno(r, "could not initialize labelling: %m"); | |
1644 | goto exit; | |
912541b0 KS |
1645 | } |
1646 | ||
712cebf1 TG |
1647 | r = mkdir("/run/udev", 0755); |
1648 | if (r < 0 && errno != EEXIST) { | |
1649 | r = log_error_errno(errno, "could not create /run/udev: %m"); | |
1650 | goto exit; | |
1651 | } | |
1652 | ||
03cfe0d5 | 1653 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1654 | |
c26d1879 TG |
1655 | if (getppid() == 1) { |
1656 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1657 | we only do this on systemd systems, and only if we are directly spawned | |
1658 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1659 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
1660 | if (r < 0) | |
1661 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1662 | } | |
1663 | ||
1664 | r = manager_new(&manager, cgroup); | |
e237d8cb | 1665 | if (r < 0) |
912541b0 | 1666 | goto exit; |
912541b0 | 1667 | |
ecb17862 | 1668 | r = udev_rules_apply_static_dev_perms(manager->rules); |
6af5e6a4 TG |
1669 | if (r < 0) |
1670 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
4d6dac13 | 1671 | |
bba7a484 | 1672 | if (arg_daemonize) { |
912541b0 | 1673 | pid_t pid; |
912541b0 | 1674 | |
3cbb2057 TG |
1675 | log_info("starting version " VERSION); |
1676 | ||
912541b0 KS |
1677 | pid = fork(); |
1678 | switch (pid) { | |
1679 | case 0: | |
1680 | break; | |
1681 | case -1: | |
6af5e6a4 | 1682 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1683 | goto exit; |
1684 | default: | |
f53d1fcd TG |
1685 | mac_selinux_finish(); |
1686 | log_close(); | |
1687 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1688 | } |
1689 | ||
1690 | setsid(); | |
1691 | ||
574d5f2d | 1692 | write_string_file("/proc/self/oom_score_adj", "-1000"); |
e237d8cb | 1693 | } else |
39fd2ca1 | 1694 | sd_notify(false, |
3cbb2057 TG |
1695 | "READY=1\n" |
1696 | "STATUS=Processing..."); | |
912541b0 | 1697 | |
86c3bece TG |
1698 | r = manager_listen(manager); |
1699 | if (r < 0) | |
1700 | return log_error_errno(r, "failed to set up fds and listen for events: %m"); | |
1701 | ||
693d371d TG |
1702 | r = sd_event_loop(manager->event); |
1703 | if (r < 0) { | |
1704 | log_error_errno(r, "event loop failed: %m"); | |
1705 | goto exit; | |
912541b0 KS |
1706 | } |
1707 | ||
693d371d TG |
1708 | sd_event_get_exit_code(manager->event, &r); |
1709 | ||
53921bfa | 1710 | exit: |
b79aacbf TG |
1711 | sd_notify(false, |
1712 | "STOPPING=1\n" | |
1713 | "STATUS=Shutting down..."); | |
1714 | ||
e237d8cb TG |
1715 | if (manager) |
1716 | udev_ctrl_cleanup(manager->ctrl); | |
cc56fafe | 1717 | mac_selinux_finish(); |
baa30fbc | 1718 | log_close(); |
6af5e6a4 | 1719 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1720 | } |