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Commit | Line | Data |
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e7145211 | 1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
7fafc032 | 2 | /* |
810adae9 LP |
3 | * Copyright © 2004 Chris Friesen <chris_friesen@sympatico.ca> |
4 | * Copyright © 2009 Canonical Ltd. | |
5 | * Copyright © 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 KS |
6 | */ |
7 | ||
7fafc032 | 8 | #include <errno.h> |
618234a5 LP |
9 | #include <fcntl.h> |
10 | #include <getopt.h> | |
11 | #include <signal.h> | |
12 | #include <stdbool.h> | |
13 | #include <stddef.h> | |
7fafc032 KS |
14 | #include <stdio.h> |
15 | #include <stdlib.h> | |
16 | #include <string.h> | |
618234a5 | 17 | #include <sys/epoll.h> |
3ebdb81e | 18 | #include <sys/file.h> |
618234a5 LP |
19 | #include <sys/inotify.h> |
20 | #include <sys/ioctl.h> | |
21 | #include <sys/mount.h> | |
1e03b754 | 22 | #include <sys/prctl.h> |
1e03b754 | 23 | #include <sys/signalfd.h> |
618234a5 | 24 | #include <sys/socket.h> |
dc117daa | 25 | #include <sys/stat.h> |
618234a5 LP |
26 | #include <sys/time.h> |
27 | #include <sys/wait.h> | |
28 | #include <unistd.h> | |
7fafc032 | 29 | |
392ef7a2 | 30 | #include "sd-daemon.h" |
693d371d | 31 | #include "sd-event.h" |
8314de1d | 32 | |
b5efdb8a | 33 | #include "alloc-util.h" |
194bbe33 | 34 | #include "cgroup-util.h" |
618234a5 | 35 | #include "cpu-set-util.h" |
5ba2dc25 | 36 | #include "dev-setup.h" |
70068602 | 37 | #include "device-util.h" |
3ffd4af2 | 38 | #include "fd-util.h" |
a5c32cff | 39 | #include "fileio.h" |
f97b34a6 | 40 | #include "format-util.h" |
f4f15635 | 41 | #include "fs-util.h" |
a505965d | 42 | #include "hashmap.h" |
c004493c | 43 | #include "io-util.h" |
70068602 | 44 | #include "libudev-device-internal.h" |
40a57716 | 45 | #include "list.h" |
618234a5 | 46 | #include "netlink-util.h" |
6bedfcbb | 47 | #include "parse-util.h" |
4e731273 | 48 | #include "proc-cmdline.h" |
618234a5 LP |
49 | #include "process-util.h" |
50 | #include "selinux-util.h" | |
51 | #include "signal-util.h" | |
8f328d36 | 52 | #include "socket-util.h" |
07630cea | 53 | #include "string-util.h" |
618234a5 | 54 | #include "terminal-util.h" |
07a26e42 | 55 | #include "udev-builtin.h" |
7d68eb1b | 56 | #include "udev-ctrl.h" |
618234a5 | 57 | #include "udev-util.h" |
70068602 | 58 | #include "udev-watch.h" |
618234a5 | 59 | #include "udev.h" |
ee104e11 | 60 | #include "user-util.h" |
7fafc032 | 61 | |
bba7a484 TG |
62 | static bool arg_debug = false; |
63 | static int arg_daemonize = false; | |
64 | static int arg_resolve_names = 1; | |
020328e1 | 65 | static unsigned arg_children_max; |
bba7a484 TG |
66 | static int arg_exec_delay; |
67 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
68 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
c0c6806b TG |
69 | |
70 | typedef struct Manager { | |
693d371d | 71 | sd_event *event; |
c0c6806b | 72 | Hashmap *workers; |
40a57716 | 73 | LIST_HEAD(struct event, events); |
c26d1879 | 74 | const char *cgroup; |
cb49a4f2 | 75 | pid_t pid; /* the process that originally allocated the manager object */ |
c0c6806b | 76 | |
ecb17862 | 77 | struct udev_rules *rules; |
9b5150b6 | 78 | Hashmap *properties; |
c0c6806b TG |
79 | |
80 | struct udev_monitor *monitor; | |
81 | struct udev_ctrl *ctrl; | |
82 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e237d8cb | 83 | int fd_inotify; |
e237d8cb TG |
84 | int worker_watch[2]; |
85 | ||
693d371d TG |
86 | sd_event_source *ctrl_event; |
87 | sd_event_source *uevent_event; | |
88 | sd_event_source *inotify_event; | |
eca195ec | 89 | sd_event_source *kill_workers_event; |
693d371d | 90 | |
7c4c7e89 TG |
91 | usec_t last_usec; |
92 | ||
c0c6806b | 93 | bool stop_exec_queue:1; |
c0c6806b TG |
94 | bool exit:1; |
95 | } Manager; | |
1e03b754 | 96 | |
1e03b754 | 97 | enum event_state { |
912541b0 KS |
98 | EVENT_UNDEF, |
99 | EVENT_QUEUED, | |
100 | EVENT_RUNNING, | |
1e03b754 KS |
101 | }; |
102 | ||
103 | struct event { | |
40a57716 | 104 | LIST_FIELDS(struct event, event); |
cb49a4f2 | 105 | Manager *manager; |
912541b0 | 106 | struct udev_device *dev; |
6969c349 | 107 | struct udev_device *dev_kernel; |
c6aa11f2 | 108 | struct worker *worker; |
912541b0 | 109 | enum event_state state; |
912541b0 KS |
110 | unsigned long long int delaying_seqnum; |
111 | unsigned long long int seqnum; | |
112 | const char *devpath; | |
113 | size_t devpath_len; | |
114 | const char *devpath_old; | |
115 | dev_t devnum; | |
912541b0 | 116 | int ifindex; |
ea6039a3 | 117 | bool is_block; |
693d371d TG |
118 | sd_event_source *timeout_warning; |
119 | sd_event_source *timeout; | |
1e03b754 KS |
120 | }; |
121 | ||
ecb17862 | 122 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
ff2c503d | 123 | |
1e03b754 | 124 | enum worker_state { |
912541b0 KS |
125 | WORKER_UNDEF, |
126 | WORKER_RUNNING, | |
127 | WORKER_IDLE, | |
128 | WORKER_KILLED, | |
1e03b754 KS |
129 | }; |
130 | ||
131 | struct worker { | |
c0c6806b | 132 | Manager *manager; |
912541b0 KS |
133 | pid_t pid; |
134 | struct udev_monitor *monitor; | |
135 | enum worker_state state; | |
136 | struct event *event; | |
1e03b754 KS |
137 | }; |
138 | ||
139 | /* passed from worker to main process */ | |
140 | struct worker_message { | |
1e03b754 KS |
141 | }; |
142 | ||
c6aa11f2 | 143 | static void event_free(struct event *event) { |
cb49a4f2 TG |
144 | int r; |
145 | ||
c6aa11f2 TG |
146 | if (!event) |
147 | return; | |
40a57716 | 148 | assert(event->manager); |
c6aa11f2 | 149 | |
40a57716 | 150 | LIST_REMOVE(event, event->manager->events, event); |
912541b0 | 151 | udev_device_unref(event->dev); |
6969c349 | 152 | udev_device_unref(event->dev_kernel); |
c6aa11f2 | 153 | |
693d371d TG |
154 | sd_event_source_unref(event->timeout_warning); |
155 | sd_event_source_unref(event->timeout); | |
156 | ||
c6aa11f2 TG |
157 | if (event->worker) |
158 | event->worker->event = NULL; | |
159 | ||
40a57716 | 160 | if (LIST_IS_EMPTY(event->manager->events)) { |
cb49a4f2 | 161 | /* only clean up the queue from the process that created it */ |
df0ff127 | 162 | if (event->manager->pid == getpid_cached()) { |
cb49a4f2 TG |
163 | r = unlink("/run/udev/queue"); |
164 | if (r < 0) | |
165 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
166 | } | |
167 | } | |
168 | ||
912541b0 | 169 | free(event); |
aa8734ff | 170 | } |
7a770250 | 171 | |
c6aa11f2 TG |
172 | static void worker_free(struct worker *worker) { |
173 | if (!worker) | |
174 | return; | |
bc113de9 | 175 | |
c0c6806b TG |
176 | assert(worker->manager); |
177 | ||
4a0b58c4 | 178 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); |
912541b0 | 179 | udev_monitor_unref(worker->monitor); |
c6aa11f2 TG |
180 | event_free(worker->event); |
181 | ||
c6aa11f2 | 182 | free(worker); |
ff2c503d KS |
183 | } |
184 | ||
c0c6806b | 185 | static void manager_workers_free(Manager *manager) { |
a505965d TG |
186 | struct worker *worker; |
187 | Iterator i; | |
ff2c503d | 188 | |
c0c6806b TG |
189 | assert(manager); |
190 | ||
191 | HASHMAP_FOREACH(worker, manager->workers, i) | |
c6aa11f2 | 192 | worker_free(worker); |
a505965d | 193 | |
c0c6806b | 194 | manager->workers = hashmap_free(manager->workers); |
fc465079 KS |
195 | } |
196 | ||
c0c6806b | 197 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { |
a505965d TG |
198 | _cleanup_free_ struct worker *worker = NULL; |
199 | int r; | |
3a19b32a TG |
200 | |
201 | assert(ret); | |
c0c6806b | 202 | assert(manager); |
3a19b32a TG |
203 | assert(worker_monitor); |
204 | assert(pid > 1); | |
205 | ||
206 | worker = new0(struct worker, 1); | |
207 | if (!worker) | |
208 | return -ENOMEM; | |
209 | ||
c0c6806b | 210 | worker->manager = manager; |
3a19b32a TG |
211 | /* close monitor, but keep address around */ |
212 | udev_monitor_disconnect(worker_monitor); | |
213 | worker->monitor = udev_monitor_ref(worker_monitor); | |
214 | worker->pid = pid; | |
a505965d | 215 | |
c0c6806b | 216 | r = hashmap_ensure_allocated(&manager->workers, NULL); |
a505965d TG |
217 | if (r < 0) |
218 | return r; | |
219 | ||
4a0b58c4 | 220 | r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker); |
a505965d TG |
221 | if (r < 0) |
222 | return r; | |
223 | ||
ae2a15bc | 224 | *ret = TAKE_PTR(worker); |
3a19b32a TG |
225 | |
226 | return 0; | |
227 | } | |
228 | ||
4fa4d885 TG |
229 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
230 | struct event *event = userdata; | |
231 | ||
232 | assert(event); | |
233 | assert(event->worker); | |
234 | ||
235 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
236 | event->worker->state = WORKER_KILLED; | |
237 | ||
238 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
239 | ||
240 | return 1; | |
241 | } | |
242 | ||
243 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
244 | struct event *event = userdata; | |
245 | ||
246 | assert(event); | |
247 | ||
248 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
249 | ||
250 | return 1; | |
251 | } | |
252 | ||
39c19cf1 | 253 | static void worker_attach_event(struct worker *worker, struct event *event) { |
693d371d TG |
254 | sd_event *e; |
255 | uint64_t usec; | |
693d371d | 256 | |
c6aa11f2 | 257 | assert(worker); |
693d371d | 258 | assert(worker->manager); |
c6aa11f2 TG |
259 | assert(event); |
260 | assert(!event->worker); | |
261 | assert(!worker->event); | |
262 | ||
39c19cf1 | 263 | worker->state = WORKER_RUNNING; |
39c19cf1 TG |
264 | worker->event = event; |
265 | event->state = EVENT_RUNNING; | |
c6aa11f2 | 266 | event->worker = worker; |
693d371d TG |
267 | |
268 | e = worker->manager->event; | |
269 | ||
3285baa8 | 270 | assert_se(sd_event_now(e, CLOCK_MONOTONIC, &usec) >= 0); |
693d371d | 271 | |
3285baa8 | 272 | (void) sd_event_add_time(e, &event->timeout_warning, CLOCK_MONOTONIC, |
693d371d TG |
273 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); |
274 | ||
3285baa8 | 275 | (void) sd_event_add_time(e, &event->timeout, CLOCK_MONOTONIC, |
693d371d | 276 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); |
39c19cf1 TG |
277 | } |
278 | ||
e237d8cb TG |
279 | static void manager_free(Manager *manager) { |
280 | if (!manager) | |
281 | return; | |
282 | ||
2024ed61 | 283 | udev_builtin_exit(); |
b2d21d93 | 284 | |
693d371d TG |
285 | sd_event_source_unref(manager->ctrl_event); |
286 | sd_event_source_unref(manager->uevent_event); | |
287 | sd_event_source_unref(manager->inotify_event); | |
eca195ec | 288 | sd_event_source_unref(manager->kill_workers_event); |
693d371d | 289 | |
693d371d | 290 | sd_event_unref(manager->event); |
e237d8cb TG |
291 | manager_workers_free(manager); |
292 | event_queue_cleanup(manager, EVENT_UNDEF); | |
293 | ||
294 | udev_monitor_unref(manager->monitor); | |
295 | udev_ctrl_unref(manager->ctrl); | |
296 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
297 | ||
9b5150b6 | 298 | hashmap_free_free_free(manager->properties); |
e237d8cb | 299 | udev_rules_unref(manager->rules); |
e237d8cb | 300 | |
e237d8cb TG |
301 | safe_close(manager->fd_inotify); |
302 | safe_close_pair(manager->worker_watch); | |
303 | ||
304 | free(manager); | |
305 | } | |
306 | ||
307 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
308 | ||
9a73bd7c TG |
309 | static int worker_send_message(int fd) { |
310 | struct worker_message message = {}; | |
311 | ||
312 | return loop_write(fd, &message, sizeof(message), false); | |
313 | } | |
314 | ||
fee854ee RK |
315 | static bool shall_lock_device(struct udev_device *dev) { |
316 | const char *sysname; | |
317 | ||
318 | if (!streq_ptr("block", udev_device_get_subsystem(dev))) | |
319 | return false; | |
320 | ||
321 | sysname = udev_device_get_sysname(dev); | |
322 | return !startswith(sysname, "dm-") && | |
323 | !startswith(sysname, "md") && | |
324 | !startswith(sysname, "drbd"); | |
325 | } | |
326 | ||
c0c6806b | 327 | static void worker_spawn(Manager *manager, struct event *event) { |
8e766630 | 328 | _cleanup_(udev_monitor_unrefp) struct udev_monitor *worker_monitor = NULL; |
912541b0 | 329 | pid_t pid; |
b6aab8ef | 330 | int r = 0; |
912541b0 KS |
331 | |
332 | /* listen for new events */ | |
2024ed61 | 333 | worker_monitor = udev_monitor_new_from_netlink(NULL, NULL); |
912541b0 KS |
334 | if (worker_monitor == NULL) |
335 | return; | |
336 | /* allow the main daemon netlink address to send devices to the worker */ | |
c0c6806b | 337 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
b6aab8ef TG |
338 | r = udev_monitor_enable_receiving(worker_monitor); |
339 | if (r < 0) | |
340 | log_error_errno(r, "worker: could not enable receiving of device: %m"); | |
912541b0 | 341 | |
912541b0 KS |
342 | pid = fork(); |
343 | switch (pid) { | |
344 | case 0: { | |
345 | struct udev_device *dev = NULL; | |
4afd3348 | 346 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
912541b0 | 347 | int fd_monitor; |
e237d8cb | 348 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
2dd9f98d TG |
349 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
350 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
912541b0 | 351 | sigset_t mask; |
912541b0 | 352 | |
43095991 | 353 | /* take initial device from queue */ |
1cc6c93a | 354 | dev = TAKE_PTR(event->dev); |
912541b0 | 355 | |
39fd2ca1 TG |
356 | unsetenv("NOTIFY_SOCKET"); |
357 | ||
c0c6806b | 358 | manager_workers_free(manager); |
ecb17862 | 359 | event_queue_cleanup(manager, EVENT_UNDEF); |
6d1b1e0b | 360 | |
e237d8cb | 361 | manager->monitor = udev_monitor_unref(manager->monitor); |
6d1b1e0b | 362 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 363 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
e237d8cb | 364 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
912541b0 | 365 | |
693d371d TG |
366 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
367 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
368 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
eca195ec | 369 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); |
693d371d TG |
370 | |
371 | manager->event = sd_event_unref(manager->event); | |
372 | ||
912541b0 KS |
373 | sigfillset(&mask); |
374 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
375 | if (fd_signal < 0) { | |
6af5e6a4 | 376 | r = log_error_errno(errno, "error creating signalfd %m"); |
912541b0 KS |
377 | goto out; |
378 | } | |
2dd9f98d TG |
379 | ep_signal.data.fd = fd_signal; |
380 | ||
381 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
382 | ep_monitor.data.fd = fd_monitor; | |
912541b0 KS |
383 | |
384 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
385 | if (fd_ep < 0) { | |
6af5e6a4 | 386 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
912541b0 KS |
387 | goto out; |
388 | } | |
389 | ||
912541b0 KS |
390 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
391 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
6af5e6a4 | 392 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
912541b0 KS |
393 | goto out; |
394 | } | |
395 | ||
045e00cf ZJS |
396 | /* Request TERM signal if parent exits. |
397 | Ignore error, not much we can do in that case. */ | |
398 | (void) prctl(PR_SET_PDEATHSIG, SIGTERM); | |
912541b0 | 399 | |
045e00cf | 400 | /* Reset OOM score, we only protect the main daemon. */ |
76cdddfb YW |
401 | r = set_oom_score_adjust(0); |
402 | if (r < 0) | |
403 | log_debug_errno(r, "Failed to reset OOM score, ignoring: %m"); | |
145dae7e | 404 | |
912541b0 | 405 | for (;;) { |
c1118ceb | 406 | _cleanup_(udev_event_freep) struct udev_event *udev_event = NULL; |
6af5e6a4 | 407 | int fd_lock = -1; |
912541b0 | 408 | |
3b64e4d4 TG |
409 | assert(dev); |
410 | ||
9f6445e3 | 411 | log_debug("seq %llu running", udev_device_get_seqnum(dev)); |
0f86dc90 YW |
412 | udev_event = udev_event_new(dev, arg_exec_delay); |
413 | if (!udev_event) { | |
6af5e6a4 | 414 | r = -ENOMEM; |
912541b0 KS |
415 | goto out; |
416 | } | |
417 | ||
3ebdb81e | 418 | /* |
2e5b17d0 | 419 | * Take a shared lock on the device node; this establishes |
3ebdb81e | 420 | * a concept of device "ownership" to serialize device |
2e5b17d0 | 421 | * access. External processes holding an exclusive lock will |
3ebdb81e | 422 | * cause udev to skip the event handling; in the case udev |
2e5b17d0 | 423 | * acquired the lock, the external process can block until |
3ebdb81e KS |
424 | * udev has finished its event handling. |
425 | */ | |
2e5b17d0 | 426 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
fee854ee | 427 | shall_lock_device(dev)) { |
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); |
3ebdb81e KS |
438 | goto skip; |
439 | } | |
440 | } | |
441 | } | |
442 | ||
4c83d994 TG |
443 | /* needed for renaming netifs */ |
444 | udev_event->rtnl = rtnl; | |
445 | ||
912541b0 | 446 | /* apply rules, create node, symlinks */ |
adeba500 KS |
447 | udev_event_execute_rules(udev_event, |
448 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
9b5150b6 | 449 | manager->properties, |
8314de1d | 450 | manager->rules); |
adeba500 KS |
451 | |
452 | udev_event_execute_run(udev_event, | |
8314de1d | 453 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 454 | |
523c620b TG |
455 | if (udev_event->rtnl) |
456 | /* in case rtnl was initialized */ | |
1c4baffc | 457 | rtnl = sd_netlink_ref(udev_event->rtnl); |
4c83d994 | 458 | |
912541b0 | 459 | /* apply/restore inotify watch */ |
bf9bead1 | 460 | if (udev_event->inotify_watch) { |
70068602 | 461 | udev_watch_begin(dev->device); |
912541b0 KS |
462 | udev_device_update_db(dev); |
463 | } | |
464 | ||
3d06f418 | 465 | safe_close(fd_lock); |
3ebdb81e | 466 | |
912541b0 KS |
467 | /* send processed event back to libudev listeners */ |
468 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
469 | ||
3ebdb81e | 470 | skip: |
4914cb2d | 471 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 472 | |
912541b0 | 473 | /* send udevd the result of the event execution */ |
e237d8cb | 474 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 475 | if (r < 0) |
9a73bd7c | 476 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 477 | udev_device_get_seqnum(dev)); |
912541b0 KS |
478 | |
479 | udev_device_unref(dev); | |
480 | dev = NULL; | |
481 | ||
912541b0 KS |
482 | /* wait for more device messages from main udevd, or term signal */ |
483 | while (dev == NULL) { | |
484 | struct epoll_event ev[4]; | |
485 | int fdcount; | |
486 | int i; | |
487 | ||
8fef0ff2 | 488 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
489 | if (fdcount < 0) { |
490 | if (errno == EINTR) | |
491 | continue; | |
6af5e6a4 | 492 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
493 | goto out; |
494 | } | |
495 | ||
496 | for (i = 0; i < fdcount; i++) { | |
497 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
498 | dev = udev_monitor_receive_device(worker_monitor); | |
499 | break; | |
500 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
501 | struct signalfd_siginfo fdsi; | |
502 | ssize_t size; | |
503 | ||
504 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
505 | if (size != sizeof(struct signalfd_siginfo)) | |
506 | continue; | |
507 | switch (fdsi.ssi_signo) { | |
508 | case SIGTERM: | |
509 | goto out; | |
510 | } | |
511 | } | |
512 | } | |
513 | } | |
514 | } | |
82063a88 | 515 | out: |
912541b0 | 516 | udev_device_unref(dev); |
e237d8cb | 517 | manager_free(manager); |
baa30fbc | 518 | log_close(); |
8b46c3fc | 519 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
520 | } |
521 | case -1: | |
912541b0 | 522 | event->state = EVENT_QUEUED; |
56f64d95 | 523 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
524 | break; |
525 | default: | |
e03c7cc2 TG |
526 | { |
527 | struct worker *worker; | |
528 | ||
c0c6806b | 529 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 530 | if (r < 0) |
e03c7cc2 | 531 | return; |
e03c7cc2 | 532 | |
39c19cf1 TG |
533 | worker_attach_event(worker, event); |
534 | ||
1fa2f38f | 535 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
536 | break; |
537 | } | |
e03c7cc2 | 538 | } |
7fafc032 KS |
539 | } |
540 | ||
c0c6806b | 541 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
542 | struct worker *worker; |
543 | Iterator i; | |
912541b0 | 544 | |
c0c6806b TG |
545 | assert(manager); |
546 | assert(event); | |
547 | ||
548 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
549 | ssize_t count; |
550 | ||
551 | if (worker->state != WORKER_IDLE) | |
552 | continue; | |
553 | ||
c0c6806b | 554 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 555 | if (count < 0) { |
1fa2f38f ZJS |
556 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
557 | worker->pid, count); | |
cb542e84 | 558 | (void) kill(worker->pid, SIGKILL); |
912541b0 KS |
559 | worker->state = WORKER_KILLED; |
560 | continue; | |
561 | } | |
39c19cf1 | 562 | worker_attach_event(worker, event); |
912541b0 KS |
563 | return; |
564 | } | |
565 | ||
c0c6806b | 566 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 567 | if (arg_children_max > 1) |
c0c6806b | 568 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
569 | return; |
570 | } | |
571 | ||
572 | /* start new worker and pass initial device */ | |
c0c6806b | 573 | worker_spawn(manager, event); |
1e03b754 KS |
574 | } |
575 | ||
ecb17862 | 576 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 577 | struct event *event; |
cb49a4f2 | 578 | int r; |
912541b0 | 579 | |
ecb17862 TG |
580 | assert(manager); |
581 | assert(dev); | |
582 | ||
040e6896 TG |
583 | /* only one process can add events to the queue */ |
584 | if (manager->pid == 0) | |
df0ff127 | 585 | manager->pid = getpid_cached(); |
040e6896 | 586 | |
df0ff127 | 587 | assert(manager->pid == getpid_cached()); |
cb49a4f2 | 588 | |
955d98c9 | 589 | event = new0(struct event, 1); |
cb49a4f2 TG |
590 | if (!event) |
591 | return -ENOMEM; | |
912541b0 | 592 | |
cb49a4f2 | 593 | event->manager = manager; |
912541b0 | 594 | event->dev = dev; |
6969c349 TG |
595 | event->dev_kernel = udev_device_shallow_clone(dev); |
596 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
597 | event->seqnum = udev_device_get_seqnum(dev); |
598 | event->devpath = udev_device_get_devpath(dev); | |
599 | event->devpath_len = strlen(event->devpath); | |
600 | event->devpath_old = udev_device_get_devpath_old(dev); | |
601 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 602 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
603 | event->ifindex = udev_device_get_ifindex(dev); |
604 | ||
9f6445e3 | 605 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
606 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
607 | ||
608 | event->state = EVENT_QUEUED; | |
cb49a4f2 | 609 | |
40a57716 | 610 | if (LIST_IS_EMPTY(manager->events)) { |
cb49a4f2 TG |
611 | r = touch("/run/udev/queue"); |
612 | if (r < 0) | |
613 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
614 | } | |
615 | ||
40a57716 | 616 | LIST_APPEND(event, manager->events, event); |
cb49a4f2 | 617 | |
912541b0 | 618 | return 0; |
fc465079 KS |
619 | } |
620 | ||
c0c6806b | 621 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
622 | struct worker *worker; |
623 | Iterator i; | |
1e03b754 | 624 | |
c0c6806b TG |
625 | assert(manager); |
626 | ||
627 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
628 | if (worker->state == WORKER_KILLED) |
629 | continue; | |
1e03b754 | 630 | |
912541b0 | 631 | worker->state = WORKER_KILLED; |
cb542e84 | 632 | (void) kill(worker->pid, SIGTERM); |
912541b0 | 633 | } |
1e03b754 KS |
634 | } |
635 | ||
e3196993 | 636 | /* lookup event for identical, parent, child device */ |
ecb17862 | 637 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
40a57716 | 638 | struct event *loop_event; |
912541b0 KS |
639 | size_t common; |
640 | ||
641 | /* check if queue contains events we depend on */ | |
40a57716 | 642 | LIST_FOREACH(event, loop_event, manager->events) { |
87ac8d99 | 643 | /* we already found a later event, earlier cannot block us, no need to check again */ |
912541b0 KS |
644 | if (loop_event->seqnum < event->delaying_seqnum) |
645 | continue; | |
646 | ||
647 | /* event we checked earlier still exists, no need to check again */ | |
648 | if (loop_event->seqnum == event->delaying_seqnum) | |
649 | return true; | |
650 | ||
651 | /* found ourself, no later event can block us */ | |
652 | if (loop_event->seqnum >= event->seqnum) | |
653 | break; | |
654 | ||
655 | /* check major/minor */ | |
656 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
657 | return true; | |
658 | ||
659 | /* check network device ifindex */ | |
660 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
661 | return true; | |
662 | ||
663 | /* check our old name */ | |
090be865 | 664 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
665 | event->delaying_seqnum = loop_event->seqnum; |
666 | return true; | |
667 | } | |
668 | ||
669 | /* compare devpath */ | |
670 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
671 | ||
672 | /* one devpath is contained in the other? */ | |
673 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
674 | continue; | |
675 | ||
676 | /* identical device event found */ | |
677 | if (loop_event->devpath_len == event->devpath_len) { | |
678 | /* devices names might have changed/swapped in the meantime */ | |
679 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
680 | continue; | |
681 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
682 | continue; | |
683 | event->delaying_seqnum = loop_event->seqnum; | |
684 | return true; | |
685 | } | |
686 | ||
687 | /* parent device event found */ | |
688 | if (event->devpath[common] == '/') { | |
689 | event->delaying_seqnum = loop_event->seqnum; | |
690 | return true; | |
691 | } | |
692 | ||
693 | /* child device event found */ | |
694 | if (loop_event->devpath[common] == '/') { | |
695 | event->delaying_seqnum = loop_event->seqnum; | |
696 | return true; | |
697 | } | |
698 | ||
699 | /* no matching device */ | |
700 | continue; | |
701 | } | |
702 | ||
703 | return false; | |
7fafc032 KS |
704 | } |
705 | ||
693d371d TG |
706 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
707 | Manager *manager = userdata; | |
708 | ||
709 | assert(manager); | |
710 | ||
711 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
712 | ||
713 | sd_event_exit(manager->event, -ETIMEDOUT); | |
714 | ||
715 | return 1; | |
716 | } | |
717 | ||
62d43dac | 718 | static void manager_exit(Manager *manager) { |
693d371d TG |
719 | uint64_t usec; |
720 | int r; | |
62d43dac TG |
721 | |
722 | assert(manager); | |
723 | ||
724 | manager->exit = true; | |
725 | ||
b79aacbf TG |
726 | sd_notify(false, |
727 | "STOPPING=1\n" | |
728 | "STATUS=Starting shutdown..."); | |
729 | ||
62d43dac | 730 | /* close sources of new events and discard buffered events */ |
693d371d | 731 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
ab7854df | 732 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
62d43dac | 733 | |
693d371d | 734 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
ab7854df | 735 | manager->fd_inotify = safe_close(manager->fd_inotify); |
62d43dac | 736 | |
693d371d | 737 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); |
ab7854df | 738 | manager->monitor = udev_monitor_unref(manager->monitor); |
62d43dac TG |
739 | |
740 | /* discard queued events and kill workers */ | |
741 | event_queue_cleanup(manager, EVENT_QUEUED); | |
742 | manager_kill_workers(manager); | |
693d371d | 743 | |
3285baa8 | 744 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
693d371d | 745 | |
3285baa8 | 746 | r = sd_event_add_time(manager->event, NULL, CLOCK_MONOTONIC, |
693d371d TG |
747 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); |
748 | if (r < 0) | |
749 | return; | |
62d43dac TG |
750 | } |
751 | ||
752 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
753 | static void manager_reload(Manager *manager) { | |
754 | ||
755 | assert(manager); | |
756 | ||
b79aacbf TG |
757 | sd_notify(false, |
758 | "RELOADING=1\n" | |
759 | "STATUS=Flushing configuration..."); | |
760 | ||
62d43dac TG |
761 | manager_kill_workers(manager); |
762 | manager->rules = udev_rules_unref(manager->rules); | |
2024ed61 | 763 | udev_builtin_exit(); |
b79aacbf | 764 | |
1ef72b55 MS |
765 | sd_notifyf(false, |
766 | "READY=1\n" | |
767 | "STATUS=Processing with %u children at max", arg_children_max); | |
62d43dac TG |
768 | } |
769 | ||
eca195ec YW |
770 | static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
771 | Manager *manager = userdata; | |
772 | ||
773 | assert(manager); | |
774 | ||
775 | log_debug("Cleanup idle workers"); | |
776 | manager_kill_workers(manager); | |
777 | ||
778 | return 1; | |
779 | } | |
780 | ||
781 | static int manager_enable_kill_workers_event(Manager *manager) { | |
782 | int enabled, r; | |
783 | ||
784 | assert(manager); | |
785 | ||
786 | if (!manager->kill_workers_event) | |
787 | goto create_new; | |
788 | ||
789 | r = sd_event_source_get_enabled(manager->kill_workers_event, &enabled); | |
790 | if (r < 0) { | |
791 | log_debug_errno(r, "Failed to query whether event source for killing idle workers is enabled or not, trying to create new event source: %m"); | |
792 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
793 | goto create_new; | |
794 | } | |
795 | ||
796 | if (enabled == SD_EVENT_ONESHOT) | |
797 | return 0; | |
798 | ||
799 | r = sd_event_source_set_time(manager->kill_workers_event, now(CLOCK_MONOTONIC) + 3 * USEC_PER_SEC); | |
800 | if (r < 0) { | |
801 | log_debug_errno(r, "Failed to set time to event source for killing idle workers, trying to create new event source: %m"); | |
802 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
803 | goto create_new; | |
804 | } | |
805 | ||
806 | r = sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_ONESHOT); | |
807 | if (r < 0) { | |
808 | log_debug_errno(r, "Failed to enable event source for killing idle workers, trying to create new event source: %m"); | |
809 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
810 | goto create_new; | |
811 | } | |
812 | ||
813 | return 0; | |
814 | ||
815 | create_new: | |
816 | r = sd_event_add_time(manager->event, &manager->kill_workers_event, CLOCK_MONOTONIC, | |
817 | now(CLOCK_MONOTONIC) + 3 * USEC_PER_SEC, USEC_PER_SEC, on_kill_workers_event, manager); | |
818 | if (r < 0) | |
819 | return log_warning_errno(r, "Failed to create timer event for killing idle workers: %m"); | |
820 | ||
821 | return 0; | |
822 | } | |
823 | ||
824 | static int manager_disable_kill_workers_event(Manager *manager) { | |
825 | int r; | |
826 | ||
827 | if (!manager->kill_workers_event) | |
828 | return 0; | |
829 | ||
830 | r = sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_OFF); | |
831 | if (r < 0) | |
832 | return log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); | |
833 | ||
834 | return 0; | |
835 | } | |
836 | ||
c0c6806b | 837 | static void event_queue_start(Manager *manager) { |
40a57716 | 838 | struct event *event; |
693d371d | 839 | usec_t usec; |
8ab44e3f | 840 | |
c0c6806b TG |
841 | assert(manager); |
842 | ||
40a57716 | 843 | if (LIST_IS_EMPTY(manager->events) || |
7c4c7e89 TG |
844 | manager->exit || manager->stop_exec_queue) |
845 | return; | |
846 | ||
3285baa8 | 847 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
38a03f06 LP |
848 | /* check for changed config, every 3 seconds at most */ |
849 | if (manager->last_usec == 0 || | |
850 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
851 | if (udev_rules_check_timestamp(manager->rules) || | |
2024ed61 | 852 | udev_builtin_validate()) |
38a03f06 | 853 | manager_reload(manager); |
693d371d | 854 | |
38a03f06 | 855 | manager->last_usec = usec; |
7c4c7e89 TG |
856 | } |
857 | ||
eca195ec YW |
858 | (void) manager_disable_kill_workers_event(manager); |
859 | ||
2024ed61 | 860 | udev_builtin_init(); |
7c4c7e89 TG |
861 | |
862 | if (!manager->rules) { | |
2024ed61 | 863 | manager->rules = udev_rules_new(arg_resolve_names); |
7c4c7e89 TG |
864 | if (!manager->rules) |
865 | return; | |
866 | } | |
867 | ||
40a57716 | 868 | LIST_FOREACH(event,event,manager->events) { |
912541b0 KS |
869 | if (event->state != EVENT_QUEUED) |
870 | continue; | |
0bc74ea7 | 871 | |
912541b0 | 872 | /* do not start event if parent or child event is still running */ |
ecb17862 | 873 | if (is_devpath_busy(manager, event)) |
912541b0 | 874 | continue; |
fc465079 | 875 | |
c0c6806b | 876 | event_run(manager, event); |
912541b0 | 877 | } |
1e03b754 KS |
878 | } |
879 | ||
ecb17862 | 880 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
40a57716 | 881 | struct event *event, *tmp; |
ff2c503d | 882 | |
40a57716 | 883 | LIST_FOREACH_SAFE(event, event, tmp, manager->events) { |
912541b0 KS |
884 | if (match_type != EVENT_UNDEF && match_type != event->state) |
885 | continue; | |
ff2c503d | 886 | |
c6aa11f2 | 887 | event_free(event); |
912541b0 | 888 | } |
ff2c503d KS |
889 | } |
890 | ||
e82e8fa5 | 891 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
892 | Manager *manager = userdata; |
893 | ||
894 | assert(manager); | |
895 | ||
912541b0 KS |
896 | for (;;) { |
897 | struct worker_message msg; | |
979558f3 TG |
898 | struct iovec iovec = { |
899 | .iov_base = &msg, | |
900 | .iov_len = sizeof(msg), | |
901 | }; | |
902 | union { | |
903 | struct cmsghdr cmsghdr; | |
904 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
905 | } control = {}; | |
906 | struct msghdr msghdr = { | |
907 | .msg_iov = &iovec, | |
908 | .msg_iovlen = 1, | |
909 | .msg_control = &control, | |
910 | .msg_controllen = sizeof(control), | |
911 | }; | |
912 | struct cmsghdr *cmsg; | |
912541b0 | 913 | ssize_t size; |
979558f3 | 914 | struct ucred *ucred = NULL; |
a505965d | 915 | struct worker *worker; |
912541b0 | 916 | |
e82e8fa5 | 917 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 918 | if (size < 0) { |
738a7907 TG |
919 | if (errno == EINTR) |
920 | continue; | |
921 | else if (errno == EAGAIN) | |
922 | /* nothing more to read */ | |
923 | break; | |
979558f3 | 924 | |
e82e8fa5 | 925 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
926 | } else if (size != sizeof(struct worker_message)) { |
927 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 928 | continue; |
979558f3 TG |
929 | } |
930 | ||
2a1288ff | 931 | CMSG_FOREACH(cmsg, &msghdr) { |
979558f3 TG |
932 | if (cmsg->cmsg_level == SOL_SOCKET && |
933 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
934 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
935 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
936 | } | |
937 | ||
938 | if (!ucred || ucred->pid <= 0) { | |
939 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
940 | continue; | |
941 | } | |
912541b0 KS |
942 | |
943 | /* lookup worker who sent the signal */ | |
4a0b58c4 | 944 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
a505965d TG |
945 | if (!worker) { |
946 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
947 | continue; | |
912541b0 | 948 | } |
c0bbfd72 | 949 | |
a505965d TG |
950 | if (worker->state != WORKER_KILLED) |
951 | worker->state = WORKER_IDLE; | |
952 | ||
953 | /* worker returned */ | |
954 | event_free(worker->event); | |
912541b0 | 955 | } |
e82e8fa5 | 956 | |
8302fe5a TG |
957 | /* we have free workers, try to schedule events */ |
958 | event_queue_start(manager); | |
959 | ||
e82e8fa5 TG |
960 | return 1; |
961 | } | |
962 | ||
963 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 964 | Manager *manager = userdata; |
e82e8fa5 TG |
965 | struct udev_device *dev; |
966 | int r; | |
967 | ||
c0c6806b | 968 | assert(manager); |
e82e8fa5 | 969 | |
c0c6806b | 970 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
971 | if (dev) { |
972 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 973 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
974 | if (r < 0) |
975 | udev_device_unref(dev); | |
8302fe5a TG |
976 | else |
977 | /* we have fresh events, try to schedule them */ | |
978 | event_queue_start(manager); | |
e82e8fa5 TG |
979 | } |
980 | ||
981 | return 1; | |
88f4b648 KS |
982 | } |
983 | ||
3b47c739 | 984 | /* receive the udevd message from userspace */ |
e82e8fa5 | 985 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 986 | Manager *manager = userdata; |
8e766630 LP |
987 | _cleanup_(udev_ctrl_connection_unrefp) struct udev_ctrl_connection *ctrl_conn = NULL; |
988 | _cleanup_(udev_ctrl_msg_unrefp) struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 | 989 | const char *str; |
9b5150b6 | 990 | int i, r; |
912541b0 | 991 | |
c0c6806b | 992 | assert(manager); |
e4f66b77 | 993 | |
c0c6806b | 994 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 995 | if (!ctrl_conn) |
e82e8fa5 | 996 | return 1; |
912541b0 KS |
997 | |
998 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 999 | if (!ctrl_msg) |
e82e8fa5 | 1000 | return 1; |
912541b0 KS |
1001 | |
1002 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
1003 | if (i >= 0) { | |
ed14edc0 | 1004 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 1005 | log_set_max_level(i); |
c0c6806b | 1006 | manager_kill_workers(manager); |
912541b0 KS |
1007 | } |
1008 | ||
1009 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 1010 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 1011 | manager->stop_exec_queue = true; |
912541b0 KS |
1012 | } |
1013 | ||
1014 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 1015 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 1016 | manager->stop_exec_queue = false; |
8302fe5a | 1017 | event_queue_start(manager); |
912541b0 KS |
1018 | } |
1019 | ||
1020 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 1021 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 1022 | manager_reload(manager); |
912541b0 KS |
1023 | } |
1024 | ||
1025 | str = udev_ctrl_get_set_env(ctrl_msg); | |
9b5150b6 YW |
1026 | if (str) { |
1027 | _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL, *old_val = NULL; | |
1028 | char *eq; | |
1029 | ||
1030 | eq = strchr(str, '='); | |
1031 | if (!eq) { | |
1032 | log_error("Invalid key format '%s'", str); | |
1033 | return 1; | |
1034 | } | |
1035 | ||
1036 | key = strndup(str, eq - str); | |
1037 | if (!key) { | |
1038 | log_oom(); | |
1039 | return 1; | |
1040 | } | |
1041 | ||
1042 | old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); | |
1043 | ||
1044 | r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); | |
1045 | if (r < 0) { | |
1046 | log_oom(); | |
1047 | return 1; | |
912541b0 | 1048 | } |
9b5150b6 YW |
1049 | |
1050 | eq++; | |
1051 | if (!isempty(eq)) { | |
1052 | log_debug("udevd message (ENV) received, unset '%s'", key); | |
1053 | ||
1054 | r = hashmap_put(manager->properties, key, NULL); | |
1055 | if (r < 0) { | |
1056 | log_oom(); | |
1057 | return 1; | |
1058 | } | |
1059 | } else { | |
1060 | val = strdup(eq); | |
1061 | if (!val) { | |
1062 | log_oom(); | |
1063 | return 1; | |
1064 | } | |
1065 | ||
1066 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); | |
1067 | ||
1068 | r = hashmap_put(manager->properties, key, val); | |
1069 | if (r < 0) { | |
1070 | log_oom(); | |
1071 | return 1; | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | key = val = NULL; | |
c0c6806b | 1076 | manager_kill_workers(manager); |
912541b0 KS |
1077 | } |
1078 | ||
1079 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
1080 | if (i >= 0) { | |
9f6445e3 | 1081 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 1082 | arg_children_max = i; |
1ef72b55 MS |
1083 | |
1084 | (void) sd_notifyf(false, | |
1085 | "READY=1\n" | |
1086 | "STATUS=Processing with %u children at max", arg_children_max); | |
912541b0 KS |
1087 | } |
1088 | ||
cb49a4f2 | 1089 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1090 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1091 | |
1092 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1093 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1094 | manager_exit(manager); |
c0c6806b TG |
1095 | /* keep reference to block the client until we exit |
1096 | TODO: deal with several blocking exit requests */ | |
1097 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1098 | } |
e4f66b77 | 1099 | |
e82e8fa5 | 1100 | return 1; |
88f4b648 | 1101 | } |
4a231017 | 1102 | |
70068602 YW |
1103 | static int synthesize_change(sd_device *dev) { |
1104 | const char *subsystem, *sysname, *devname, *syspath, *devtype; | |
1105 | char filename[PATH_MAX]; | |
f3a740a5 | 1106 | int r; |
edd32000 | 1107 | |
70068602 YW |
1108 | r = sd_device_get_subsystem(dev, &subsystem); |
1109 | if (r < 0) | |
1110 | return r; | |
1111 | ||
1112 | r = sd_device_get_sysname(dev, &sysname); | |
1113 | if (r < 0) | |
1114 | return r; | |
1115 | ||
1116 | r = sd_device_get_devname(dev, &devname); | |
1117 | if (r < 0) | |
1118 | return r; | |
1119 | ||
1120 | r = sd_device_get_syspath(dev, &syspath); | |
1121 | if (r < 0) | |
1122 | return r; | |
1123 | ||
1124 | r = sd_device_get_devtype(dev, &devtype); | |
1125 | if (r < 0) | |
1126 | return r; | |
1127 | ||
1128 | if (streq_ptr("block", subsystem) && | |
1129 | streq_ptr("disk", devtype) && | |
1130 | !startswith(sysname, "dm-")) { | |
1131 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; | |
1132 | bool part_table_read = false, has_partitions = false; | |
1133 | sd_device *d; | |
ede34445 | 1134 | int fd; |
f3a740a5 | 1135 | |
ede34445 | 1136 | /* |
e9fc29f4 KS |
1137 | * Try to re-read the partition table. This only succeeds if |
1138 | * none of the devices is busy. The kernel returns 0 if no | |
1139 | * partition table is found, and we will not get an event for | |
1140 | * the disk. | |
ede34445 | 1141 | */ |
70068602 | 1142 | fd = open(devname, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1143 | if (fd >= 0) { |
02ba8fb3 KS |
1144 | r = flock(fd, LOCK_EX|LOCK_NB); |
1145 | if (r >= 0) | |
1146 | r = ioctl(fd, BLKRRPART, 0); | |
1147 | ||
ede34445 KS |
1148 | close(fd); |
1149 | if (r >= 0) | |
e9fc29f4 | 1150 | part_table_read = true; |
ede34445 KS |
1151 | } |
1152 | ||
e9fc29f4 | 1153 | /* search for partitions */ |
70068602 | 1154 | r = sd_device_enumerator_new(&e); |
f3a740a5 KS |
1155 | if (r < 0) |
1156 | return r; | |
1157 | ||
70068602 | 1158 | r = sd_device_enumerator_allow_uninitialized(e); |
f3a740a5 KS |
1159 | if (r < 0) |
1160 | return r; | |
1161 | ||
70068602 | 1162 | r = sd_device_enumerator_add_match_parent(e, dev); |
47a3fa0f TA |
1163 | if (r < 0) |
1164 | return r; | |
e9fc29f4 | 1165 | |
70068602 YW |
1166 | r = sd_device_enumerator_add_match_subsystem(e, "block", true); |
1167 | if (r < 0) | |
1168 | return r; | |
e9fc29f4 | 1169 | |
70068602 YW |
1170 | FOREACH_DEVICE(e, d) { |
1171 | const char *t; | |
e9fc29f4 | 1172 | |
70068602 YW |
1173 | if (sd_device_get_devtype(d, &t) < 0 || |
1174 | !streq("partition", t)) | |
e9fc29f4 KS |
1175 | continue; |
1176 | ||
1177 | has_partitions = true; | |
1178 | break; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * We have partitions and re-read the table, the kernel already sent | |
1183 | * out a "change" event for the disk, and "remove/add" for all | |
1184 | * partitions. | |
1185 | */ | |
1186 | if (part_table_read && has_partitions) | |
1187 | return 0; | |
1188 | ||
1189 | /* | |
1190 | * We have partitions but re-reading the partition table did not | |
1191 | * work, synthesize "change" for the disk and all partitions. | |
1192 | */ | |
70068602 YW |
1193 | log_debug("Device '%s' is closed, synthesising 'change'", devname); |
1194 | strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); | |
57512c89 | 1195 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
e9fc29f4 | 1196 | |
70068602 YW |
1197 | FOREACH_DEVICE(e, d) { |
1198 | const char *t, *n, *s; | |
f3a740a5 | 1199 | |
70068602 YW |
1200 | if (sd_device_get_devtype(d, &t) < 0 || |
1201 | !streq("partition", t)) | |
f3a740a5 KS |
1202 | continue; |
1203 | ||
70068602 YW |
1204 | if (sd_device_get_devname(d, &n) < 0 || |
1205 | sd_device_get_syspath(d, &s) < 0) | |
f3a740a5 KS |
1206 | continue; |
1207 | ||
70068602 YW |
1208 | log_debug("Device '%s' is closed, synthesising partition '%s' 'change'", devname, n); |
1209 | strscpyl(filename, sizeof(filename), s, "/uevent", NULL); | |
57512c89 | 1210 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
f3a740a5 | 1211 | } |
ede34445 KS |
1212 | |
1213 | return 0; | |
f3a740a5 KS |
1214 | } |
1215 | ||
70068602 YW |
1216 | log_debug("Device %s is closed, synthesising 'change'", devname); |
1217 | strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); | |
57512c89 | 1218 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
ede34445 | 1219 | |
f3a740a5 | 1220 | return 0; |
edd32000 KS |
1221 | } |
1222 | ||
e82e8fa5 | 1223 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1224 | Manager *manager = userdata; |
0254e944 | 1225 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1226 | struct inotify_event *e; |
1227 | ssize_t l; | |
912541b0 | 1228 | |
c0c6806b | 1229 | assert(manager); |
e82e8fa5 | 1230 | |
eca195ec YW |
1231 | (void) manager_disable_kill_workers_event(manager); |
1232 | ||
e82e8fa5 | 1233 | l = read(fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 1234 | if (l < 0) { |
3742095b | 1235 | if (IN_SET(errno, EAGAIN, EINTR)) |
e82e8fa5 | 1236 | return 1; |
912541b0 | 1237 | |
f7c1ad4f | 1238 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1239 | } |
1240 | ||
f7c1ad4f | 1241 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
70068602 YW |
1242 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
1243 | const char *devnode; | |
1244 | ||
7fe3324c | 1245 | if (udev_watch_lookup(e->wd, &dev) <= 0) |
70068602 | 1246 | continue; |
912541b0 | 1247 | |
70068602 | 1248 | if (sd_device_get_devname(dev, &devnode) < 0) |
edd32000 | 1249 | continue; |
912541b0 | 1250 | |
7fe3324c | 1251 | log_device_debug(dev, "Inotify event: %x for %s", e->mask, devnode); |
da143134 | 1252 | if (e->mask & IN_CLOSE_WRITE) |
edd32000 | 1253 | synthesize_change(dev); |
da143134 | 1254 | else if (e->mask & IN_IGNORED) |
2024ed61 | 1255 | udev_watch_end(dev); |
912541b0 KS |
1256 | } |
1257 | ||
e82e8fa5 | 1258 | return 1; |
bd284db1 SJR |
1259 | } |
1260 | ||
0561329d | 1261 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1262 | Manager *manager = userdata; |
1263 | ||
1264 | assert(manager); | |
1265 | ||
62d43dac | 1266 | manager_exit(manager); |
912541b0 | 1267 | |
e82e8fa5 TG |
1268 | return 1; |
1269 | } | |
912541b0 | 1270 | |
0561329d | 1271 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1272 | Manager *manager = userdata; |
1273 | ||
1274 | assert(manager); | |
1275 | ||
62d43dac | 1276 | manager_reload(manager); |
912541b0 | 1277 | |
e82e8fa5 TG |
1278 | return 1; |
1279 | } | |
912541b0 | 1280 | |
e82e8fa5 | 1281 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1282 | Manager *manager = userdata; |
1283 | ||
1284 | assert(manager); | |
1285 | ||
e82e8fa5 TG |
1286 | for (;;) { |
1287 | pid_t pid; | |
1288 | int status; | |
1289 | struct worker *worker; | |
d1317d02 | 1290 | |
e82e8fa5 TG |
1291 | pid = waitpid(-1, &status, WNOHANG); |
1292 | if (pid <= 0) | |
f29328d6 | 1293 | break; |
e82e8fa5 | 1294 | |
4a0b58c4 | 1295 | worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); |
e82e8fa5 TG |
1296 | if (!worker) { |
1297 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1298 | continue; |
912541b0 | 1299 | } |
e82e8fa5 TG |
1300 | |
1301 | if (WIFEXITED(status)) { | |
1302 | if (WEXITSTATUS(status) == 0) | |
1303 | log_debug("worker ["PID_FMT"] exited", pid); | |
1304 | else | |
1305 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1306 | } else if (WIFSIGNALED(status)) { | |
76341acc | 1307 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), signal_to_string(WTERMSIG(status))); |
e82e8fa5 TG |
1308 | } else if (WIFSTOPPED(status)) { |
1309 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1310 | continue; |
e82e8fa5 TG |
1311 | } else if (WIFCONTINUED(status)) { |
1312 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1313 | continue; |
e82e8fa5 TG |
1314 | } else |
1315 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1316 | ||
05e6d9c6 YW |
1317 | if ((!WIFEXITED(status) || WEXITSTATUS(status) != 0) && worker->event) { |
1318 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1319 | /* delete state from disk */ | |
1320 | udev_device_delete_db(worker->event->dev); | |
1321 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1322 | /* forward kernel event without amending it */ | |
1323 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); | |
e82e8fa5 TG |
1324 | } |
1325 | ||
1326 | worker_free(worker); | |
912541b0 | 1327 | } |
e82e8fa5 | 1328 | |
8302fe5a TG |
1329 | /* we can start new workers, try to schedule events */ |
1330 | event_queue_start(manager); | |
1331 | ||
eca195ec YW |
1332 | /* Disable unnecessary cleanup event */ |
1333 | if (hashmap_isempty(manager->workers) && manager->kill_workers_event) | |
1334 | (void) sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_OFF); | |
1335 | ||
e82e8fa5 | 1336 | return 1; |
f27125f9 | 1337 | } |
1338 | ||
693d371d TG |
1339 | static int on_post(sd_event_source *s, void *userdata) { |
1340 | Manager *manager = userdata; | |
693d371d TG |
1341 | |
1342 | assert(manager); | |
1343 | ||
b6107f01 YW |
1344 | if (!LIST_IS_EMPTY(manager->events)) |
1345 | return 1; | |
1346 | ||
1347 | /* There are no pending events. Let's cleanup idle process. */ | |
1348 | ||
1349 | if (!hashmap_isempty(manager->workers)) { | |
1350 | /* There are idle workers */ | |
eca195ec | 1351 | (void) manager_enable_kill_workers_event(manager); |
b6107f01 | 1352 | return 1; |
693d371d TG |
1353 | } |
1354 | ||
b6107f01 YW |
1355 | /* There are no idle workers. */ |
1356 | ||
1357 | if (manager->exit) | |
1358 | return sd_event_exit(manager->event, 0); | |
1359 | ||
1360 | if (manager->cgroup) | |
1361 | /* cleanup possible left-over processes in our cgroup */ | |
1362 | (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); | |
1363 | ||
693d371d TG |
1364 | return 1; |
1365 | } | |
1366 | ||
fcff1e72 TG |
1367 | static int listen_fds(int *rctrl, int *rnetlink) { |
1368 | int ctrl_fd = -1, netlink_fd = -1; | |
f59118ec | 1369 | int fd, n, r; |
912541b0 | 1370 | |
fcff1e72 TG |
1371 | assert(rctrl); |
1372 | assert(rnetlink); | |
1373 | ||
912541b0 | 1374 | n = sd_listen_fds(true); |
fcff1e72 TG |
1375 | if (n < 0) |
1376 | return n; | |
912541b0 KS |
1377 | |
1378 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1379 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1380 | if (ctrl_fd >= 0) |
1381 | return -EINVAL; | |
1382 | ctrl_fd = fd; | |
912541b0 KS |
1383 | continue; |
1384 | } | |
1385 | ||
1386 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1387 | if (netlink_fd >= 0) |
1388 | return -EINVAL; | |
1389 | netlink_fd = fd; | |
912541b0 KS |
1390 | continue; |
1391 | } | |
1392 | ||
fcff1e72 | 1393 | return -EINVAL; |
912541b0 KS |
1394 | } |
1395 | ||
f59118ec | 1396 | if (ctrl_fd < 0) { |
8e766630 | 1397 | _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *ctrl = NULL; |
f59118ec | 1398 | |
2024ed61 | 1399 | ctrl = udev_ctrl_new(); |
f59118ec TG |
1400 | if (!ctrl) |
1401 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1402 | ||
1403 | r = udev_ctrl_enable_receiving(ctrl); | |
1404 | if (r < 0) | |
1405 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1406 | ||
1407 | fd = udev_ctrl_get_fd(ctrl); | |
1408 | if (fd < 0) | |
1409 | return log_error_errno(EIO, "could not get ctrl fd"); | |
fcff1e72 | 1410 | |
f59118ec TG |
1411 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
1412 | if (ctrl_fd < 0) | |
1413 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1414 | } | |
1415 | ||
1416 | if (netlink_fd < 0) { | |
8e766630 | 1417 | _cleanup_(udev_monitor_unrefp) struct udev_monitor *monitor = NULL; |
f59118ec | 1418 | |
2024ed61 | 1419 | monitor = udev_monitor_new_from_netlink(NULL, "kernel"); |
f59118ec TG |
1420 | if (!monitor) |
1421 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1422 | ||
1423 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1424 | ||
1425 | r = udev_monitor_enable_receiving(monitor); | |
1426 | if (r < 0) | |
1427 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1428 | ||
1429 | fd = udev_monitor_get_fd(monitor); | |
1430 | if (fd < 0) | |
1431 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1432 | ||
1433 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
a92cf784 | 1434 | if (netlink_fd < 0) |
f59118ec TG |
1435 | return log_error_errno(errno, "could not dup netlink fd: %m"); |
1436 | } | |
fcff1e72 TG |
1437 | |
1438 | *rctrl = ctrl_fd; | |
1439 | *rnetlink = netlink_fd; | |
912541b0 | 1440 | |
912541b0 | 1441 | return 0; |
7459bcdc KS |
1442 | } |
1443 | ||
e6f86cac | 1444 | /* |
3f85ef0f | 1445 | * read the kernel command line, in case we need to get into debug mode |
1d84ad94 LP |
1446 | * udev.log_priority=<level> syslog priority |
1447 | * udev.children_max=<number of workers> events are fully serialized if set to 1 | |
1448 | * udev.exec_delay=<number of seconds> delay execution of every executed program | |
1449 | * udev.event_timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1450 | */ |
96287a49 | 1451 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
92e72467 | 1452 | int r = 0; |
e6f86cac | 1453 | |
614a823c | 1454 | assert(key); |
e6f86cac | 1455 | |
614a823c TG |
1456 | if (!value) |
1457 | return 0; | |
e6f86cac | 1458 | |
1d84ad94 LP |
1459 | if (proc_cmdline_key_streq(key, "udev.log_priority")) { |
1460 | ||
1461 | if (proc_cmdline_value_missing(key, value)) | |
1462 | return 0; | |
1463 | ||
92e72467 ZJS |
1464 | r = util_log_priority(value); |
1465 | if (r >= 0) | |
1466 | log_set_max_level(r); | |
1d84ad94 LP |
1467 | |
1468 | } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { | |
1469 | ||
1470 | if (proc_cmdline_value_missing(key, value)) | |
1471 | return 0; | |
1472 | ||
92e72467 ZJS |
1473 | r = safe_atou64(value, &arg_event_timeout_usec); |
1474 | if (r >= 0) { | |
1475 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1476 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1477 | } | |
1d84ad94 LP |
1478 | |
1479 | } else if (proc_cmdline_key_streq(key, "udev.children_max")) { | |
1480 | ||
1481 | if (proc_cmdline_value_missing(key, value)) | |
1482 | return 0; | |
1483 | ||
020328e1 | 1484 | r = safe_atou(value, &arg_children_max); |
1d84ad94 LP |
1485 | |
1486 | } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { | |
1487 | ||
1488 | if (proc_cmdline_value_missing(key, value)) | |
1489 | return 0; | |
1490 | ||
614a823c | 1491 | r = safe_atoi(value, &arg_exec_delay); |
1d84ad94 LP |
1492 | |
1493 | } else if (startswith(key, "udev.")) | |
92e72467 | 1494 | log_warning("Unknown udev kernel command line option \"%s\"", key); |
614a823c | 1495 | |
92e72467 ZJS |
1496 | if (r < 0) |
1497 | log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); | |
1d84ad94 | 1498 | |
614a823c | 1499 | return 0; |
e6f86cac KS |
1500 | } |
1501 | ||
37ec0fdd LP |
1502 | static int help(void) { |
1503 | _cleanup_free_ char *link = NULL; | |
1504 | int r; | |
1505 | ||
1506 | r = terminal_urlify_man("systemd-udevd.service", "8", &link); | |
1507 | if (r < 0) | |
1508 | return log_oom(); | |
1509 | ||
ed216e1f TG |
1510 | printf("%s [OPTIONS...]\n\n" |
1511 | "Manages devices.\n\n" | |
5ac0162c | 1512 | " -h --help Print this message\n" |
2d19c17e MF |
1513 | " -V --version Print version of the program\n" |
1514 | " -d --daemon Detach and run in the background\n" | |
1515 | " -D --debug Enable debug output\n" | |
1516 | " -c --children-max=INT Set maximum number of workers\n" | |
1517 | " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1518 | " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1519 | " -N --resolve-names=early|late|never\n" | |
5ac0162c | 1520 | " When to resolve users and groups\n" |
37ec0fdd LP |
1521 | "\nSee the %s for details.\n" |
1522 | , program_invocation_short_name | |
1523 | , link | |
1524 | ); | |
1525 | ||
1526 | return 0; | |
ed216e1f TG |
1527 | } |
1528 | ||
bba7a484 | 1529 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1530 | static const struct option options[] = { |
bba7a484 TG |
1531 | { "daemon", no_argument, NULL, 'd' }, |
1532 | { "debug", no_argument, NULL, 'D' }, | |
1533 | { "children-max", required_argument, NULL, 'c' }, | |
1534 | { "exec-delay", required_argument, NULL, 'e' }, | |
1535 | { "event-timeout", required_argument, NULL, 't' }, | |
1536 | { "resolve-names", required_argument, NULL, 'N' }, | |
1537 | { "help", no_argument, NULL, 'h' }, | |
1538 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1539 | {} |
1540 | }; | |
689a97f5 | 1541 | |
bba7a484 | 1542 | int c; |
689a97f5 | 1543 | |
bba7a484 TG |
1544 | assert(argc >= 0); |
1545 | assert(argv); | |
912541b0 | 1546 | |
e14b6f21 | 1547 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
f1e8664e | 1548 | int r; |
912541b0 | 1549 | |
bba7a484 | 1550 | switch (c) { |
912541b0 | 1551 | |
912541b0 | 1552 | case 'd': |
bba7a484 | 1553 | arg_daemonize = true; |
912541b0 KS |
1554 | break; |
1555 | case 'c': | |
020328e1 | 1556 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1557 | if (r < 0) |
1558 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1559 | break; |
1560 | case 'e': | |
6f5cf8a8 TG |
1561 | r = safe_atoi(optarg, &arg_exec_delay); |
1562 | if (r < 0) | |
1563 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1564 | break; |
9719859c | 1565 | case 't': |
f1e8664e TG |
1566 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1567 | if (r < 0) | |
65fea570 | 1568 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1569 | else { |
1570 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1571 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1572 | } | |
9719859c | 1573 | break; |
912541b0 | 1574 | case 'D': |
bba7a484 | 1575 | arg_debug = true; |
912541b0 KS |
1576 | break; |
1577 | case 'N': | |
090be865 | 1578 | if (streq(optarg, "early")) { |
bba7a484 | 1579 | arg_resolve_names = 1; |
090be865 | 1580 | } else if (streq(optarg, "late")) { |
bba7a484 | 1581 | arg_resolve_names = 0; |
090be865 | 1582 | } else if (streq(optarg, "never")) { |
bba7a484 | 1583 | arg_resolve_names = -1; |
912541b0 | 1584 | } else { |
9f6445e3 | 1585 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1586 | return 0; |
912541b0 KS |
1587 | } |
1588 | break; | |
1589 | case 'h': | |
37ec0fdd | 1590 | return help(); |
912541b0 | 1591 | case 'V': |
948aaa7c | 1592 | printf("%s\n", PACKAGE_VERSION); |
bba7a484 TG |
1593 | return 0; |
1594 | case '?': | |
1595 | return -EINVAL; | |
912541b0 | 1596 | default: |
bba7a484 TG |
1597 | assert_not_reached("Unhandled option"); |
1598 | ||
912541b0 KS |
1599 | } |
1600 | } | |
1601 | ||
bba7a484 TG |
1602 | return 1; |
1603 | } | |
1604 | ||
b7f74dd4 | 1605 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1606 | _cleanup_(manager_freep) Manager *manager = NULL; |
6d5e65f6 | 1607 | int r, fd_worker; |
c0c6806b TG |
1608 | |
1609 | assert(ret); | |
11b1dd8c TG |
1610 | assert(fd_ctrl >= 0); |
1611 | assert(fd_uevent >= 0); | |
c0c6806b TG |
1612 | |
1613 | manager = new0(Manager, 1); | |
1614 | if (!manager) | |
1615 | return log_oom(); | |
1616 | ||
e237d8cb TG |
1617 | manager->fd_inotify = -1; |
1618 | manager->worker_watch[WRITE_END] = -1; | |
1619 | manager->worker_watch[READ_END] = -1; | |
1620 | ||
2024ed61 | 1621 | udev_builtin_init(); |
b2d21d93 | 1622 | |
2024ed61 | 1623 | manager->rules = udev_rules_new(arg_resolve_names); |
ecb17862 TG |
1624 | if (!manager->rules) |
1625 | return log_error_errno(ENOMEM, "error reading rules"); | |
1626 | ||
40a57716 | 1627 | LIST_HEAD_INIT(manager->events); |
ecb17862 | 1628 | |
c26d1879 TG |
1629 | manager->cgroup = cgroup; |
1630 | ||
2024ed61 | 1631 | manager->ctrl = udev_ctrl_new_from_fd(fd_ctrl); |
f59118ec TG |
1632 | if (!manager->ctrl) |
1633 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e237d8cb | 1634 | |
2024ed61 | 1635 | manager->monitor = udev_monitor_new_from_netlink_fd(NULL, "kernel", fd_uevent); |
f59118ec TG |
1636 | if (!manager->monitor) |
1637 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1638 | |
1639 | /* unnamed socket from workers to the main daemon */ | |
1640 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1641 | if (r < 0) | |
1642 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1643 | ||
693d371d | 1644 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1645 | |
2ff48e98 | 1646 | r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
e237d8cb | 1647 | if (r < 0) |
2ff48e98 | 1648 | return log_error_errno(r, "could not enable SO_PASSCRED: %m"); |
e237d8cb | 1649 | |
b7759e04 YW |
1650 | r = udev_watch_init(); |
1651 | if (r < 0) | |
1652 | return log_error_errno(r, "Failed to create inotify descriptor: %m"); | |
1653 | manager->fd_inotify = r; | |
e237d8cb | 1654 | |
2024ed61 | 1655 | udev_watch_restore(); |
e237d8cb TG |
1656 | |
1657 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1658 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1659 | |
49f997f3 TG |
1660 | r = sd_event_default(&manager->event); |
1661 | if (r < 0) | |
709f6e46 | 1662 | return log_error_errno(r, "could not allocate event loop: %m"); |
49f997f3 | 1663 | |
693d371d TG |
1664 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1665 | if (r < 0) | |
1666 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1667 | ||
1668 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1669 | if (r < 0) | |
1670 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1671 | ||
1672 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1673 | if (r < 0) | |
1674 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1675 | ||
1676 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1677 | if (r < 0) | |
1678 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1679 | ||
1680 | r = sd_event_set_watchdog(manager->event, true); | |
1681 | if (r < 0) | |
1682 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1683 | ||
11b1dd8c | 1684 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1685 | if (r < 0) |
1686 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1687 | ||
1688 | /* This needs to be after the inotify and uevent handling, to make sure | |
1689 | * that the ping is send back after fully processing the pending uevents | |
1690 | * (including the synthetic ones we may create due to inotify events). | |
1691 | */ | |
1692 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1693 | if (r < 0) | |
1694 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1695 | ||
1696 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1697 | if (r < 0) | |
1698 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1699 | ||
11b1dd8c | 1700 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); |
693d371d TG |
1701 | if (r < 0) |
1702 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1703 | ||
1704 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1705 | if (r < 0) | |
1706 | return log_error_errno(r, "error creating worker event source: %m"); | |
1707 | ||
1708 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1709 | if (r < 0) | |
1710 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1711 | |
1cc6c93a | 1712 | *ret = TAKE_PTR(manager); |
11b1dd8c | 1713 | |
86c3bece | 1714 | return 0; |
c0c6806b TG |
1715 | } |
1716 | ||
077fc5e2 | 1717 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1718 | _cleanup_(manager_freep) Manager *manager = NULL; |
077fc5e2 DH |
1719 | int r; |
1720 | ||
1721 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1722 | if (r < 0) { | |
1723 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1724 | goto exit; | |
1725 | } | |
1726 | ||
1727 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1728 | if (r < 0) | |
1729 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1730 | ||
1ef72b55 MS |
1731 | (void) sd_notifyf(false, |
1732 | "READY=1\n" | |
1733 | "STATUS=Processing with %u children at max", arg_children_max); | |
077fc5e2 DH |
1734 | |
1735 | r = sd_event_loop(manager->event); | |
1736 | if (r < 0) { | |
1737 | log_error_errno(r, "event loop failed: %m"); | |
1738 | goto exit; | |
1739 | } | |
1740 | ||
1741 | sd_event_get_exit_code(manager->event, &r); | |
1742 | ||
1743 | exit: | |
1744 | sd_notify(false, | |
1745 | "STOPPING=1\n" | |
1746 | "STATUS=Shutting down..."); | |
1747 | if (manager) | |
1748 | udev_ctrl_cleanup(manager->ctrl); | |
1749 | return r; | |
1750 | } | |
1751 | ||
1752 | int main(int argc, char *argv[]) { | |
c26d1879 | 1753 | _cleanup_free_ char *cgroup = NULL; |
efa1606e | 1754 | int fd_ctrl = -1, fd_uevent = -1; |
e5d7bce1 | 1755 | int r; |
bba7a484 | 1756 | |
bba7a484 | 1757 | log_set_target(LOG_TARGET_AUTO); |
b237a168 | 1758 | udev_parse_config(); |
bba7a484 TG |
1759 | log_parse_environment(); |
1760 | log_open(); | |
1761 | ||
bba7a484 TG |
1762 | r = parse_argv(argc, argv); |
1763 | if (r <= 0) | |
1764 | goto exit; | |
1765 | ||
1d84ad94 | 1766 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
614a823c TG |
1767 | if (r < 0) |
1768 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1769 | |
78d3e041 KS |
1770 | if (arg_debug) { |
1771 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1772 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1773 | } |
bba7a484 | 1774 | |
6174a243 YW |
1775 | log_set_max_level_realm(LOG_REALM_SYSTEMD, log_get_max_level()); |
1776 | ||
fba868fa LP |
1777 | r = must_be_root(); |
1778 | if (r < 0) | |
912541b0 | 1779 | goto exit; |
912541b0 | 1780 | |
712cebf1 TG |
1781 | if (arg_children_max == 0) { |
1782 | cpu_set_t cpu_set; | |
e438c57a | 1783 | unsigned long mem_limit; |
ebc164ef | 1784 | |
712cebf1 | 1785 | arg_children_max = 8; |
d457ff83 | 1786 | |
ece174c5 | 1787 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
faae64fa | 1788 | arg_children_max += CPU_COUNT(&cpu_set) * 8; |
912541b0 | 1789 | |
e438c57a MW |
1790 | mem_limit = physical_memory() / (128LU*1024*1024); |
1791 | arg_children_max = MAX(10U, MIN(arg_children_max, mem_limit)); | |
1792 | ||
712cebf1 | 1793 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1794 | } |
912541b0 | 1795 | |
712cebf1 TG |
1796 | /* set umask before creating any file/directory */ |
1797 | r = chdir("/"); | |
1798 | if (r < 0) { | |
1799 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1800 | goto exit; | |
1801 | } | |
194bbe33 | 1802 | |
712cebf1 | 1803 | umask(022); |
912541b0 | 1804 | |
c3dacc8b | 1805 | r = mac_selinux_init(); |
712cebf1 TG |
1806 | if (r < 0) { |
1807 | log_error_errno(r, "could not initialize labelling: %m"); | |
1808 | goto exit; | |
912541b0 KS |
1809 | } |
1810 | ||
dae8b82e ZJS |
1811 | r = mkdir_errno_wrapper("/run/udev", 0755); |
1812 | if (r < 0 && r != -EEXIST) { | |
1813 | log_error_errno(r, "could not create /run/udev: %m"); | |
712cebf1 TG |
1814 | goto exit; |
1815 | } | |
1816 | ||
03cfe0d5 | 1817 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1818 | |
c26d1879 TG |
1819 | if (getppid() == 1) { |
1820 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1821 | we only do this on systemd systems, and only if we are directly spawned | |
1822 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1823 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
11b9fb15 | 1824 | if (r < 0) { |
a2d61f07 | 1825 | if (IN_SET(r, -ENOENT, -ENOMEDIUM)) |
11b9fb15 TG |
1826 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1827 | else | |
1828 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1829 | } | |
c26d1879 TG |
1830 | } |
1831 | ||
b7f74dd4 TG |
1832 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1833 | if (r < 0) { | |
1834 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1835 | goto exit; | |
1836 | } | |
1837 | ||
bba7a484 | 1838 | if (arg_daemonize) { |
912541b0 | 1839 | pid_t pid; |
912541b0 | 1840 | |
948aaa7c | 1841 | log_info("starting version " PACKAGE_VERSION); |
3cbb2057 | 1842 | |
40e749b5 | 1843 | /* connect /dev/null to stdin, stdout, stderr */ |
c76cf844 AK |
1844 | if (log_get_max_level() < LOG_DEBUG) { |
1845 | r = make_null_stdio(); | |
1846 | if (r < 0) | |
1847 | log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); | |
1848 | } | |
1849 | ||
912541b0 KS |
1850 | pid = fork(); |
1851 | switch (pid) { | |
1852 | case 0: | |
1853 | break; | |
1854 | case -1: | |
6af5e6a4 | 1855 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1856 | goto exit; |
1857 | default: | |
f53d1fcd TG |
1858 | mac_selinux_finish(); |
1859 | log_close(); | |
1860 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1861 | } |
1862 | ||
1863 | setsid(); | |
1864 | ||
76cdddfb YW |
1865 | r = set_oom_score_adjust(-1000); |
1866 | if (r < 0) | |
1867 | log_debug_errno(r, "Failed to adjust OOM score, ignoring: %m"); | |
7500cd5e | 1868 | } |
912541b0 | 1869 | |
077fc5e2 | 1870 | r = run(fd_ctrl, fd_uevent, cgroup); |
693d371d | 1871 | |
53921bfa | 1872 | exit: |
cc56fafe | 1873 | mac_selinux_finish(); |
baa30fbc | 1874 | log_close(); |
6af5e6a4 | 1875 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1876 | } |