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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)); |
e0bb2ff9 | 412 | udev_event = udev_event_new(dev, arg_exec_delay, rtnl); |
0f86dc90 | 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 | ||
912541b0 | 443 | /* apply rules, create node, symlinks */ |
adeba500 KS |
444 | udev_event_execute_rules(udev_event, |
445 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
9b5150b6 | 446 | manager->properties, |
8314de1d | 447 | manager->rules); |
adeba500 KS |
448 | |
449 | udev_event_execute_run(udev_event, | |
8314de1d | 450 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 451 | |
e0bb2ff9 | 452 | if (!rtnl) |
523c620b | 453 | /* in case rtnl was initialized */ |
1c4baffc | 454 | rtnl = sd_netlink_ref(udev_event->rtnl); |
4c83d994 | 455 | |
912541b0 | 456 | /* apply/restore inotify watch */ |
bf9bead1 | 457 | if (udev_event->inotify_watch) { |
70068602 | 458 | udev_watch_begin(dev->device); |
912541b0 KS |
459 | udev_device_update_db(dev); |
460 | } | |
461 | ||
3d06f418 | 462 | safe_close(fd_lock); |
3ebdb81e | 463 | |
912541b0 KS |
464 | /* send processed event back to libudev listeners */ |
465 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
466 | ||
3ebdb81e | 467 | skip: |
4914cb2d | 468 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 469 | |
912541b0 | 470 | /* send udevd the result of the event execution */ |
e237d8cb | 471 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 472 | if (r < 0) |
9a73bd7c | 473 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 474 | udev_device_get_seqnum(dev)); |
912541b0 KS |
475 | |
476 | udev_device_unref(dev); | |
477 | dev = NULL; | |
478 | ||
912541b0 KS |
479 | /* wait for more device messages from main udevd, or term signal */ |
480 | while (dev == NULL) { | |
481 | struct epoll_event ev[4]; | |
482 | int fdcount; | |
483 | int i; | |
484 | ||
8fef0ff2 | 485 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
486 | if (fdcount < 0) { |
487 | if (errno == EINTR) | |
488 | continue; | |
6af5e6a4 | 489 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
490 | goto out; |
491 | } | |
492 | ||
493 | for (i = 0; i < fdcount; i++) { | |
494 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
495 | dev = udev_monitor_receive_device(worker_monitor); | |
496 | break; | |
497 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
498 | struct signalfd_siginfo fdsi; | |
499 | ssize_t size; | |
500 | ||
501 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
502 | if (size != sizeof(struct signalfd_siginfo)) | |
503 | continue; | |
504 | switch (fdsi.ssi_signo) { | |
505 | case SIGTERM: | |
506 | goto out; | |
507 | } | |
508 | } | |
509 | } | |
510 | } | |
511 | } | |
82063a88 | 512 | out: |
912541b0 | 513 | udev_device_unref(dev); |
e237d8cb | 514 | manager_free(manager); |
baa30fbc | 515 | log_close(); |
8b46c3fc | 516 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
517 | } |
518 | case -1: | |
912541b0 | 519 | event->state = EVENT_QUEUED; |
56f64d95 | 520 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
521 | break; |
522 | default: | |
e03c7cc2 TG |
523 | { |
524 | struct worker *worker; | |
525 | ||
c0c6806b | 526 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 527 | if (r < 0) |
e03c7cc2 | 528 | return; |
e03c7cc2 | 529 | |
39c19cf1 TG |
530 | worker_attach_event(worker, event); |
531 | ||
1fa2f38f | 532 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
533 | break; |
534 | } | |
e03c7cc2 | 535 | } |
7fafc032 KS |
536 | } |
537 | ||
c0c6806b | 538 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
539 | struct worker *worker; |
540 | Iterator i; | |
912541b0 | 541 | |
c0c6806b TG |
542 | assert(manager); |
543 | assert(event); | |
544 | ||
545 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
546 | ssize_t count; |
547 | ||
548 | if (worker->state != WORKER_IDLE) | |
549 | continue; | |
550 | ||
c0c6806b | 551 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 552 | if (count < 0) { |
1fa2f38f ZJS |
553 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
554 | worker->pid, count); | |
cb542e84 | 555 | (void) kill(worker->pid, SIGKILL); |
912541b0 KS |
556 | worker->state = WORKER_KILLED; |
557 | continue; | |
558 | } | |
39c19cf1 | 559 | worker_attach_event(worker, event); |
912541b0 KS |
560 | return; |
561 | } | |
562 | ||
c0c6806b | 563 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 564 | if (arg_children_max > 1) |
c0c6806b | 565 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
566 | return; |
567 | } | |
568 | ||
569 | /* start new worker and pass initial device */ | |
c0c6806b | 570 | worker_spawn(manager, event); |
1e03b754 KS |
571 | } |
572 | ||
ecb17862 | 573 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 574 | struct event *event; |
cb49a4f2 | 575 | int r; |
912541b0 | 576 | |
ecb17862 TG |
577 | assert(manager); |
578 | assert(dev); | |
579 | ||
040e6896 TG |
580 | /* only one process can add events to the queue */ |
581 | if (manager->pid == 0) | |
df0ff127 | 582 | manager->pid = getpid_cached(); |
040e6896 | 583 | |
df0ff127 | 584 | assert(manager->pid == getpid_cached()); |
cb49a4f2 | 585 | |
955d98c9 | 586 | event = new0(struct event, 1); |
cb49a4f2 TG |
587 | if (!event) |
588 | return -ENOMEM; | |
912541b0 | 589 | |
cb49a4f2 | 590 | event->manager = manager; |
912541b0 | 591 | event->dev = dev; |
6969c349 TG |
592 | event->dev_kernel = udev_device_shallow_clone(dev); |
593 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
594 | event->seqnum = udev_device_get_seqnum(dev); |
595 | event->devpath = udev_device_get_devpath(dev); | |
596 | event->devpath_len = strlen(event->devpath); | |
597 | event->devpath_old = udev_device_get_devpath_old(dev); | |
598 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 599 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
600 | event->ifindex = udev_device_get_ifindex(dev); |
601 | ||
9f6445e3 | 602 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
603 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
604 | ||
605 | event->state = EVENT_QUEUED; | |
cb49a4f2 | 606 | |
40a57716 | 607 | if (LIST_IS_EMPTY(manager->events)) { |
cb49a4f2 TG |
608 | r = touch("/run/udev/queue"); |
609 | if (r < 0) | |
610 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
611 | } | |
612 | ||
40a57716 | 613 | LIST_APPEND(event, manager->events, event); |
cb49a4f2 | 614 | |
912541b0 | 615 | return 0; |
fc465079 KS |
616 | } |
617 | ||
c0c6806b | 618 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
619 | struct worker *worker; |
620 | Iterator i; | |
1e03b754 | 621 | |
c0c6806b TG |
622 | assert(manager); |
623 | ||
624 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
625 | if (worker->state == WORKER_KILLED) |
626 | continue; | |
1e03b754 | 627 | |
912541b0 | 628 | worker->state = WORKER_KILLED; |
cb542e84 | 629 | (void) kill(worker->pid, SIGTERM); |
912541b0 | 630 | } |
1e03b754 KS |
631 | } |
632 | ||
e3196993 | 633 | /* lookup event for identical, parent, child device */ |
ecb17862 | 634 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
40a57716 | 635 | struct event *loop_event; |
912541b0 KS |
636 | size_t common; |
637 | ||
638 | /* check if queue contains events we depend on */ | |
40a57716 | 639 | LIST_FOREACH(event, loop_event, manager->events) { |
87ac8d99 | 640 | /* we already found a later event, earlier cannot block us, no need to check again */ |
912541b0 KS |
641 | if (loop_event->seqnum < event->delaying_seqnum) |
642 | continue; | |
643 | ||
644 | /* event we checked earlier still exists, no need to check again */ | |
645 | if (loop_event->seqnum == event->delaying_seqnum) | |
646 | return true; | |
647 | ||
648 | /* found ourself, no later event can block us */ | |
649 | if (loop_event->seqnum >= event->seqnum) | |
650 | break; | |
651 | ||
652 | /* check major/minor */ | |
653 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
654 | return true; | |
655 | ||
656 | /* check network device ifindex */ | |
657 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
658 | return true; | |
659 | ||
660 | /* check our old name */ | |
090be865 | 661 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
662 | event->delaying_seqnum = loop_event->seqnum; |
663 | return true; | |
664 | } | |
665 | ||
666 | /* compare devpath */ | |
667 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
668 | ||
669 | /* one devpath is contained in the other? */ | |
670 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
671 | continue; | |
672 | ||
673 | /* identical device event found */ | |
674 | if (loop_event->devpath_len == event->devpath_len) { | |
675 | /* devices names might have changed/swapped in the meantime */ | |
676 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
677 | continue; | |
678 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
679 | continue; | |
680 | event->delaying_seqnum = loop_event->seqnum; | |
681 | return true; | |
682 | } | |
683 | ||
684 | /* parent device event found */ | |
685 | if (event->devpath[common] == '/') { | |
686 | event->delaying_seqnum = loop_event->seqnum; | |
687 | return true; | |
688 | } | |
689 | ||
690 | /* child device event found */ | |
691 | if (loop_event->devpath[common] == '/') { | |
692 | event->delaying_seqnum = loop_event->seqnum; | |
693 | return true; | |
694 | } | |
695 | ||
696 | /* no matching device */ | |
697 | continue; | |
698 | } | |
699 | ||
700 | return false; | |
7fafc032 KS |
701 | } |
702 | ||
693d371d TG |
703 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
704 | Manager *manager = userdata; | |
705 | ||
706 | assert(manager); | |
707 | ||
708 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
709 | ||
710 | sd_event_exit(manager->event, -ETIMEDOUT); | |
711 | ||
712 | return 1; | |
713 | } | |
714 | ||
62d43dac | 715 | static void manager_exit(Manager *manager) { |
693d371d TG |
716 | uint64_t usec; |
717 | int r; | |
62d43dac TG |
718 | |
719 | assert(manager); | |
720 | ||
721 | manager->exit = true; | |
722 | ||
b79aacbf TG |
723 | sd_notify(false, |
724 | "STOPPING=1\n" | |
725 | "STATUS=Starting shutdown..."); | |
726 | ||
62d43dac | 727 | /* close sources of new events and discard buffered events */ |
693d371d | 728 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
ab7854df | 729 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
62d43dac | 730 | |
693d371d | 731 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
ab7854df | 732 | manager->fd_inotify = safe_close(manager->fd_inotify); |
62d43dac | 733 | |
693d371d | 734 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); |
ab7854df | 735 | manager->monitor = udev_monitor_unref(manager->monitor); |
62d43dac TG |
736 | |
737 | /* discard queued events and kill workers */ | |
738 | event_queue_cleanup(manager, EVENT_QUEUED); | |
739 | manager_kill_workers(manager); | |
693d371d | 740 | |
3285baa8 | 741 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
693d371d | 742 | |
3285baa8 | 743 | r = sd_event_add_time(manager->event, NULL, CLOCK_MONOTONIC, |
693d371d TG |
744 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); |
745 | if (r < 0) | |
746 | return; | |
62d43dac TG |
747 | } |
748 | ||
749 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
750 | static void manager_reload(Manager *manager) { | |
751 | ||
752 | assert(manager); | |
753 | ||
b79aacbf TG |
754 | sd_notify(false, |
755 | "RELOADING=1\n" | |
756 | "STATUS=Flushing configuration..."); | |
757 | ||
62d43dac TG |
758 | manager_kill_workers(manager); |
759 | manager->rules = udev_rules_unref(manager->rules); | |
2024ed61 | 760 | udev_builtin_exit(); |
b79aacbf | 761 | |
1ef72b55 MS |
762 | sd_notifyf(false, |
763 | "READY=1\n" | |
764 | "STATUS=Processing with %u children at max", arg_children_max); | |
62d43dac TG |
765 | } |
766 | ||
eca195ec YW |
767 | static int on_kill_workers_event(sd_event_source *s, uint64_t usec, void *userdata) { |
768 | Manager *manager = userdata; | |
769 | ||
770 | assert(manager); | |
771 | ||
772 | log_debug("Cleanup idle workers"); | |
773 | manager_kill_workers(manager); | |
774 | ||
775 | return 1; | |
776 | } | |
777 | ||
778 | static int manager_enable_kill_workers_event(Manager *manager) { | |
779 | int enabled, r; | |
780 | ||
781 | assert(manager); | |
782 | ||
783 | if (!manager->kill_workers_event) | |
784 | goto create_new; | |
785 | ||
786 | r = sd_event_source_get_enabled(manager->kill_workers_event, &enabled); | |
787 | if (r < 0) { | |
788 | 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"); | |
789 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
790 | goto create_new; | |
791 | } | |
792 | ||
793 | if (enabled == SD_EVENT_ONESHOT) | |
794 | return 0; | |
795 | ||
796 | r = sd_event_source_set_time(manager->kill_workers_event, now(CLOCK_MONOTONIC) + 3 * USEC_PER_SEC); | |
797 | if (r < 0) { | |
798 | log_debug_errno(r, "Failed to set time to event source for killing idle workers, trying to create new event source: %m"); | |
799 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
800 | goto create_new; | |
801 | } | |
802 | ||
803 | r = sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_ONESHOT); | |
804 | if (r < 0) { | |
805 | log_debug_errno(r, "Failed to enable event source for killing idle workers, trying to create new event source: %m"); | |
806 | manager->kill_workers_event = sd_event_source_unref(manager->kill_workers_event); | |
807 | goto create_new; | |
808 | } | |
809 | ||
810 | return 0; | |
811 | ||
812 | create_new: | |
813 | r = sd_event_add_time(manager->event, &manager->kill_workers_event, CLOCK_MONOTONIC, | |
814 | now(CLOCK_MONOTONIC) + 3 * USEC_PER_SEC, USEC_PER_SEC, on_kill_workers_event, manager); | |
815 | if (r < 0) | |
816 | return log_warning_errno(r, "Failed to create timer event for killing idle workers: %m"); | |
817 | ||
818 | return 0; | |
819 | } | |
820 | ||
821 | static int manager_disable_kill_workers_event(Manager *manager) { | |
822 | int r; | |
823 | ||
824 | if (!manager->kill_workers_event) | |
825 | return 0; | |
826 | ||
827 | r = sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_OFF); | |
828 | if (r < 0) | |
829 | return log_warning_errno(r, "Failed to disable event source for cleaning up idle workers, ignoring: %m"); | |
830 | ||
831 | return 0; | |
832 | } | |
833 | ||
c0c6806b | 834 | static void event_queue_start(Manager *manager) { |
40a57716 | 835 | struct event *event; |
693d371d | 836 | usec_t usec; |
8ab44e3f | 837 | |
c0c6806b TG |
838 | assert(manager); |
839 | ||
40a57716 | 840 | if (LIST_IS_EMPTY(manager->events) || |
7c4c7e89 TG |
841 | manager->exit || manager->stop_exec_queue) |
842 | return; | |
843 | ||
3285baa8 | 844 | assert_se(sd_event_now(manager->event, CLOCK_MONOTONIC, &usec) >= 0); |
38a03f06 LP |
845 | /* check for changed config, every 3 seconds at most */ |
846 | if (manager->last_usec == 0 || | |
847 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
848 | if (udev_rules_check_timestamp(manager->rules) || | |
2024ed61 | 849 | udev_builtin_validate()) |
38a03f06 | 850 | manager_reload(manager); |
693d371d | 851 | |
38a03f06 | 852 | manager->last_usec = usec; |
7c4c7e89 TG |
853 | } |
854 | ||
eca195ec YW |
855 | (void) manager_disable_kill_workers_event(manager); |
856 | ||
2024ed61 | 857 | udev_builtin_init(); |
7c4c7e89 TG |
858 | |
859 | if (!manager->rules) { | |
2024ed61 | 860 | manager->rules = udev_rules_new(arg_resolve_names); |
7c4c7e89 TG |
861 | if (!manager->rules) |
862 | return; | |
863 | } | |
864 | ||
40a57716 | 865 | LIST_FOREACH(event,event,manager->events) { |
912541b0 KS |
866 | if (event->state != EVENT_QUEUED) |
867 | continue; | |
0bc74ea7 | 868 | |
912541b0 | 869 | /* do not start event if parent or child event is still running */ |
ecb17862 | 870 | if (is_devpath_busy(manager, event)) |
912541b0 | 871 | continue; |
fc465079 | 872 | |
c0c6806b | 873 | event_run(manager, event); |
912541b0 | 874 | } |
1e03b754 KS |
875 | } |
876 | ||
ecb17862 | 877 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
40a57716 | 878 | struct event *event, *tmp; |
ff2c503d | 879 | |
40a57716 | 880 | LIST_FOREACH_SAFE(event, event, tmp, manager->events) { |
912541b0 KS |
881 | if (match_type != EVENT_UNDEF && match_type != event->state) |
882 | continue; | |
ff2c503d | 883 | |
c6aa11f2 | 884 | event_free(event); |
912541b0 | 885 | } |
ff2c503d KS |
886 | } |
887 | ||
e82e8fa5 | 888 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
889 | Manager *manager = userdata; |
890 | ||
891 | assert(manager); | |
892 | ||
912541b0 KS |
893 | for (;;) { |
894 | struct worker_message msg; | |
979558f3 TG |
895 | struct iovec iovec = { |
896 | .iov_base = &msg, | |
897 | .iov_len = sizeof(msg), | |
898 | }; | |
899 | union { | |
900 | struct cmsghdr cmsghdr; | |
901 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
902 | } control = {}; | |
903 | struct msghdr msghdr = { | |
904 | .msg_iov = &iovec, | |
905 | .msg_iovlen = 1, | |
906 | .msg_control = &control, | |
907 | .msg_controllen = sizeof(control), | |
908 | }; | |
909 | struct cmsghdr *cmsg; | |
912541b0 | 910 | ssize_t size; |
979558f3 | 911 | struct ucred *ucred = NULL; |
a505965d | 912 | struct worker *worker; |
912541b0 | 913 | |
e82e8fa5 | 914 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 915 | if (size < 0) { |
738a7907 TG |
916 | if (errno == EINTR) |
917 | continue; | |
918 | else if (errno == EAGAIN) | |
919 | /* nothing more to read */ | |
920 | break; | |
979558f3 | 921 | |
e82e8fa5 | 922 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
923 | } else if (size != sizeof(struct worker_message)) { |
924 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 925 | continue; |
979558f3 TG |
926 | } |
927 | ||
2a1288ff | 928 | CMSG_FOREACH(cmsg, &msghdr) { |
979558f3 TG |
929 | if (cmsg->cmsg_level == SOL_SOCKET && |
930 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
931 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
932 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
933 | } | |
934 | ||
935 | if (!ucred || ucred->pid <= 0) { | |
936 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
937 | continue; | |
938 | } | |
912541b0 KS |
939 | |
940 | /* lookup worker who sent the signal */ | |
4a0b58c4 | 941 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
a505965d TG |
942 | if (!worker) { |
943 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
944 | continue; | |
912541b0 | 945 | } |
c0bbfd72 | 946 | |
a505965d TG |
947 | if (worker->state != WORKER_KILLED) |
948 | worker->state = WORKER_IDLE; | |
949 | ||
950 | /* worker returned */ | |
951 | event_free(worker->event); | |
912541b0 | 952 | } |
e82e8fa5 | 953 | |
8302fe5a TG |
954 | /* we have free workers, try to schedule events */ |
955 | event_queue_start(manager); | |
956 | ||
e82e8fa5 TG |
957 | return 1; |
958 | } | |
959 | ||
960 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 961 | Manager *manager = userdata; |
e82e8fa5 TG |
962 | struct udev_device *dev; |
963 | int r; | |
964 | ||
c0c6806b | 965 | assert(manager); |
e82e8fa5 | 966 | |
c0c6806b | 967 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
968 | if (dev) { |
969 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 970 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
971 | if (r < 0) |
972 | udev_device_unref(dev); | |
8302fe5a TG |
973 | else |
974 | /* we have fresh events, try to schedule them */ | |
975 | event_queue_start(manager); | |
e82e8fa5 TG |
976 | } |
977 | ||
978 | return 1; | |
88f4b648 KS |
979 | } |
980 | ||
3b47c739 | 981 | /* receive the udevd message from userspace */ |
e82e8fa5 | 982 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 983 | Manager *manager = userdata; |
8e766630 LP |
984 | _cleanup_(udev_ctrl_connection_unrefp) struct udev_ctrl_connection *ctrl_conn = NULL; |
985 | _cleanup_(udev_ctrl_msg_unrefp) struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 | 986 | const char *str; |
9b5150b6 | 987 | int i, r; |
912541b0 | 988 | |
c0c6806b | 989 | assert(manager); |
e4f66b77 | 990 | |
c0c6806b | 991 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 992 | if (!ctrl_conn) |
e82e8fa5 | 993 | return 1; |
912541b0 KS |
994 | |
995 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 996 | if (!ctrl_msg) |
e82e8fa5 | 997 | return 1; |
912541b0 KS |
998 | |
999 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
1000 | if (i >= 0) { | |
ed14edc0 | 1001 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 1002 | log_set_max_level(i); |
c0c6806b | 1003 | manager_kill_workers(manager); |
912541b0 KS |
1004 | } |
1005 | ||
1006 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 1007 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 1008 | manager->stop_exec_queue = true; |
912541b0 KS |
1009 | } |
1010 | ||
1011 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 1012 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 1013 | manager->stop_exec_queue = false; |
8302fe5a | 1014 | event_queue_start(manager); |
912541b0 KS |
1015 | } |
1016 | ||
1017 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 1018 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 1019 | manager_reload(manager); |
912541b0 KS |
1020 | } |
1021 | ||
1022 | str = udev_ctrl_get_set_env(ctrl_msg); | |
9b5150b6 YW |
1023 | if (str) { |
1024 | _cleanup_free_ char *key = NULL, *val = NULL, *old_key = NULL, *old_val = NULL; | |
1025 | char *eq; | |
1026 | ||
1027 | eq = strchr(str, '='); | |
1028 | if (!eq) { | |
1029 | log_error("Invalid key format '%s'", str); | |
1030 | return 1; | |
1031 | } | |
1032 | ||
1033 | key = strndup(str, eq - str); | |
1034 | if (!key) { | |
1035 | log_oom(); | |
1036 | return 1; | |
1037 | } | |
1038 | ||
1039 | old_val = hashmap_remove2(manager->properties, key, (void **) &old_key); | |
1040 | ||
1041 | r = hashmap_ensure_allocated(&manager->properties, &string_hash_ops); | |
1042 | if (r < 0) { | |
1043 | log_oom(); | |
1044 | return 1; | |
912541b0 | 1045 | } |
9b5150b6 YW |
1046 | |
1047 | eq++; | |
1048 | if (!isempty(eq)) { | |
1049 | log_debug("udevd message (ENV) received, unset '%s'", key); | |
1050 | ||
1051 | r = hashmap_put(manager->properties, key, NULL); | |
1052 | if (r < 0) { | |
1053 | log_oom(); | |
1054 | return 1; | |
1055 | } | |
1056 | } else { | |
1057 | val = strdup(eq); | |
1058 | if (!val) { | |
1059 | log_oom(); | |
1060 | return 1; | |
1061 | } | |
1062 | ||
1063 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); | |
1064 | ||
1065 | r = hashmap_put(manager->properties, key, val); | |
1066 | if (r < 0) { | |
1067 | log_oom(); | |
1068 | return 1; | |
1069 | } | |
1070 | } | |
1071 | ||
1072 | key = val = NULL; | |
c0c6806b | 1073 | manager_kill_workers(manager); |
912541b0 KS |
1074 | } |
1075 | ||
1076 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
1077 | if (i >= 0) { | |
9f6445e3 | 1078 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 1079 | arg_children_max = i; |
1ef72b55 MS |
1080 | |
1081 | (void) sd_notifyf(false, | |
1082 | "READY=1\n" | |
1083 | "STATUS=Processing with %u children at max", arg_children_max); | |
912541b0 KS |
1084 | } |
1085 | ||
cb49a4f2 | 1086 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1087 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1088 | |
1089 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1090 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1091 | manager_exit(manager); |
c0c6806b TG |
1092 | /* keep reference to block the client until we exit |
1093 | TODO: deal with several blocking exit requests */ | |
1094 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1095 | } |
e4f66b77 | 1096 | |
e82e8fa5 | 1097 | return 1; |
88f4b648 | 1098 | } |
4a231017 | 1099 | |
70068602 YW |
1100 | static int synthesize_change(sd_device *dev) { |
1101 | const char *subsystem, *sysname, *devname, *syspath, *devtype; | |
1102 | char filename[PATH_MAX]; | |
f3a740a5 | 1103 | int r; |
edd32000 | 1104 | |
70068602 YW |
1105 | r = sd_device_get_subsystem(dev, &subsystem); |
1106 | if (r < 0) | |
1107 | return r; | |
1108 | ||
1109 | r = sd_device_get_sysname(dev, &sysname); | |
1110 | if (r < 0) | |
1111 | return r; | |
1112 | ||
1113 | r = sd_device_get_devname(dev, &devname); | |
1114 | if (r < 0) | |
1115 | return r; | |
1116 | ||
1117 | r = sd_device_get_syspath(dev, &syspath); | |
1118 | if (r < 0) | |
1119 | return r; | |
1120 | ||
1121 | r = sd_device_get_devtype(dev, &devtype); | |
1122 | if (r < 0) | |
1123 | return r; | |
1124 | ||
1125 | if (streq_ptr("block", subsystem) && | |
1126 | streq_ptr("disk", devtype) && | |
1127 | !startswith(sysname, "dm-")) { | |
1128 | _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; | |
1129 | bool part_table_read = false, has_partitions = false; | |
1130 | sd_device *d; | |
ede34445 | 1131 | int fd; |
f3a740a5 | 1132 | |
ede34445 | 1133 | /* |
e9fc29f4 KS |
1134 | * Try to re-read the partition table. This only succeeds if |
1135 | * none of the devices is busy. The kernel returns 0 if no | |
1136 | * partition table is found, and we will not get an event for | |
1137 | * the disk. | |
ede34445 | 1138 | */ |
70068602 | 1139 | fd = open(devname, O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1140 | if (fd >= 0) { |
02ba8fb3 KS |
1141 | r = flock(fd, LOCK_EX|LOCK_NB); |
1142 | if (r >= 0) | |
1143 | r = ioctl(fd, BLKRRPART, 0); | |
1144 | ||
ede34445 KS |
1145 | close(fd); |
1146 | if (r >= 0) | |
e9fc29f4 | 1147 | part_table_read = true; |
ede34445 KS |
1148 | } |
1149 | ||
e9fc29f4 | 1150 | /* search for partitions */ |
70068602 | 1151 | r = sd_device_enumerator_new(&e); |
f3a740a5 KS |
1152 | if (r < 0) |
1153 | return r; | |
1154 | ||
70068602 | 1155 | r = sd_device_enumerator_allow_uninitialized(e); |
f3a740a5 KS |
1156 | if (r < 0) |
1157 | return r; | |
1158 | ||
70068602 | 1159 | r = sd_device_enumerator_add_match_parent(e, dev); |
47a3fa0f TA |
1160 | if (r < 0) |
1161 | return r; | |
e9fc29f4 | 1162 | |
70068602 YW |
1163 | r = sd_device_enumerator_add_match_subsystem(e, "block", true); |
1164 | if (r < 0) | |
1165 | return r; | |
e9fc29f4 | 1166 | |
70068602 YW |
1167 | FOREACH_DEVICE(e, d) { |
1168 | const char *t; | |
e9fc29f4 | 1169 | |
70068602 YW |
1170 | if (sd_device_get_devtype(d, &t) < 0 || |
1171 | !streq("partition", t)) | |
e9fc29f4 KS |
1172 | continue; |
1173 | ||
1174 | has_partitions = true; | |
1175 | break; | |
1176 | } | |
1177 | ||
1178 | /* | |
1179 | * We have partitions and re-read the table, the kernel already sent | |
1180 | * out a "change" event for the disk, and "remove/add" for all | |
1181 | * partitions. | |
1182 | */ | |
1183 | if (part_table_read && has_partitions) | |
1184 | return 0; | |
1185 | ||
1186 | /* | |
1187 | * We have partitions but re-reading the partition table did not | |
1188 | * work, synthesize "change" for the disk and all partitions. | |
1189 | */ | |
70068602 YW |
1190 | log_debug("Device '%s' is closed, synthesising 'change'", devname); |
1191 | strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); | |
57512c89 | 1192 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
e9fc29f4 | 1193 | |
70068602 YW |
1194 | FOREACH_DEVICE(e, d) { |
1195 | const char *t, *n, *s; | |
f3a740a5 | 1196 | |
70068602 YW |
1197 | if (sd_device_get_devtype(d, &t) < 0 || |
1198 | !streq("partition", t)) | |
f3a740a5 KS |
1199 | continue; |
1200 | ||
70068602 YW |
1201 | if (sd_device_get_devname(d, &n) < 0 || |
1202 | sd_device_get_syspath(d, &s) < 0) | |
f3a740a5 KS |
1203 | continue; |
1204 | ||
70068602 YW |
1205 | log_debug("Device '%s' is closed, synthesising partition '%s' 'change'", devname, n); |
1206 | strscpyl(filename, sizeof(filename), s, "/uevent", NULL); | |
57512c89 | 1207 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
f3a740a5 | 1208 | } |
ede34445 KS |
1209 | |
1210 | return 0; | |
f3a740a5 KS |
1211 | } |
1212 | ||
70068602 YW |
1213 | log_debug("Device %s is closed, synthesising 'change'", devname); |
1214 | strscpyl(filename, sizeof(filename), syspath, "/uevent", NULL); | |
57512c89 | 1215 | write_string_file(filename, "change", WRITE_STRING_FILE_DISABLE_BUFFER); |
ede34445 | 1216 | |
f3a740a5 | 1217 | return 0; |
edd32000 KS |
1218 | } |
1219 | ||
e82e8fa5 | 1220 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1221 | Manager *manager = userdata; |
0254e944 | 1222 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1223 | struct inotify_event *e; |
1224 | ssize_t l; | |
912541b0 | 1225 | |
c0c6806b | 1226 | assert(manager); |
e82e8fa5 | 1227 | |
eca195ec YW |
1228 | (void) manager_disable_kill_workers_event(manager); |
1229 | ||
e82e8fa5 | 1230 | l = read(fd, &buffer, sizeof(buffer)); |
f7c1ad4f | 1231 | if (l < 0) { |
3742095b | 1232 | if (IN_SET(errno, EAGAIN, EINTR)) |
e82e8fa5 | 1233 | return 1; |
912541b0 | 1234 | |
f7c1ad4f | 1235 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1236 | } |
1237 | ||
f7c1ad4f | 1238 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
70068602 YW |
1239 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
1240 | const char *devnode; | |
1241 | ||
7fe3324c | 1242 | if (udev_watch_lookup(e->wd, &dev) <= 0) |
70068602 | 1243 | continue; |
912541b0 | 1244 | |
70068602 | 1245 | if (sd_device_get_devname(dev, &devnode) < 0) |
edd32000 | 1246 | continue; |
912541b0 | 1247 | |
7fe3324c | 1248 | log_device_debug(dev, "Inotify event: %x for %s", e->mask, devnode); |
da143134 | 1249 | if (e->mask & IN_CLOSE_WRITE) |
edd32000 | 1250 | synthesize_change(dev); |
da143134 | 1251 | else if (e->mask & IN_IGNORED) |
2024ed61 | 1252 | udev_watch_end(dev); |
912541b0 KS |
1253 | } |
1254 | ||
e82e8fa5 | 1255 | return 1; |
bd284db1 SJR |
1256 | } |
1257 | ||
0561329d | 1258 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1259 | Manager *manager = userdata; |
1260 | ||
1261 | assert(manager); | |
1262 | ||
62d43dac | 1263 | manager_exit(manager); |
912541b0 | 1264 | |
e82e8fa5 TG |
1265 | return 1; |
1266 | } | |
912541b0 | 1267 | |
0561329d | 1268 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1269 | Manager *manager = userdata; |
1270 | ||
1271 | assert(manager); | |
1272 | ||
62d43dac | 1273 | manager_reload(manager); |
912541b0 | 1274 | |
e82e8fa5 TG |
1275 | return 1; |
1276 | } | |
912541b0 | 1277 | |
e82e8fa5 | 1278 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1279 | Manager *manager = userdata; |
1280 | ||
1281 | assert(manager); | |
1282 | ||
e82e8fa5 TG |
1283 | for (;;) { |
1284 | pid_t pid; | |
1285 | int status; | |
1286 | struct worker *worker; | |
d1317d02 | 1287 | |
e82e8fa5 TG |
1288 | pid = waitpid(-1, &status, WNOHANG); |
1289 | if (pid <= 0) | |
f29328d6 | 1290 | break; |
e82e8fa5 | 1291 | |
4a0b58c4 | 1292 | worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); |
e82e8fa5 TG |
1293 | if (!worker) { |
1294 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1295 | continue; |
912541b0 | 1296 | } |
e82e8fa5 TG |
1297 | |
1298 | if (WIFEXITED(status)) { | |
1299 | if (WEXITSTATUS(status) == 0) | |
1300 | log_debug("worker ["PID_FMT"] exited", pid); | |
1301 | else | |
1302 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1303 | } else if (WIFSIGNALED(status)) { | |
76341acc | 1304 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), signal_to_string(WTERMSIG(status))); |
e82e8fa5 TG |
1305 | } else if (WIFSTOPPED(status)) { |
1306 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1307 | continue; |
e82e8fa5 TG |
1308 | } else if (WIFCONTINUED(status)) { |
1309 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1310 | continue; |
e82e8fa5 TG |
1311 | } else |
1312 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1313 | ||
05e6d9c6 YW |
1314 | if ((!WIFEXITED(status) || WEXITSTATUS(status) != 0) && worker->event) { |
1315 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1316 | /* delete state from disk */ | |
1317 | udev_device_delete_db(worker->event->dev); | |
1318 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1319 | /* forward kernel event without amending it */ | |
1320 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); | |
e82e8fa5 TG |
1321 | } |
1322 | ||
1323 | worker_free(worker); | |
912541b0 | 1324 | } |
e82e8fa5 | 1325 | |
8302fe5a TG |
1326 | /* we can start new workers, try to schedule events */ |
1327 | event_queue_start(manager); | |
1328 | ||
eca195ec YW |
1329 | /* Disable unnecessary cleanup event */ |
1330 | if (hashmap_isempty(manager->workers) && manager->kill_workers_event) | |
1331 | (void) sd_event_source_set_enabled(manager->kill_workers_event, SD_EVENT_OFF); | |
1332 | ||
e82e8fa5 | 1333 | return 1; |
f27125f9 | 1334 | } |
1335 | ||
693d371d TG |
1336 | static int on_post(sd_event_source *s, void *userdata) { |
1337 | Manager *manager = userdata; | |
693d371d TG |
1338 | |
1339 | assert(manager); | |
1340 | ||
b6107f01 YW |
1341 | if (!LIST_IS_EMPTY(manager->events)) |
1342 | return 1; | |
1343 | ||
1344 | /* There are no pending events. Let's cleanup idle process. */ | |
1345 | ||
1346 | if (!hashmap_isempty(manager->workers)) { | |
1347 | /* There are idle workers */ | |
eca195ec | 1348 | (void) manager_enable_kill_workers_event(manager); |
b6107f01 | 1349 | return 1; |
693d371d TG |
1350 | } |
1351 | ||
b6107f01 YW |
1352 | /* There are no idle workers. */ |
1353 | ||
1354 | if (manager->exit) | |
1355 | return sd_event_exit(manager->event, 0); | |
1356 | ||
1357 | if (manager->cgroup) | |
1358 | /* cleanup possible left-over processes in our cgroup */ | |
1359 | (void) cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); | |
1360 | ||
693d371d TG |
1361 | return 1; |
1362 | } | |
1363 | ||
fcff1e72 TG |
1364 | static int listen_fds(int *rctrl, int *rnetlink) { |
1365 | int ctrl_fd = -1, netlink_fd = -1; | |
f59118ec | 1366 | int fd, n, r; |
912541b0 | 1367 | |
fcff1e72 TG |
1368 | assert(rctrl); |
1369 | assert(rnetlink); | |
1370 | ||
912541b0 | 1371 | n = sd_listen_fds(true); |
fcff1e72 TG |
1372 | if (n < 0) |
1373 | return n; | |
912541b0 KS |
1374 | |
1375 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1376 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1377 | if (ctrl_fd >= 0) |
1378 | return -EINVAL; | |
1379 | ctrl_fd = fd; | |
912541b0 KS |
1380 | continue; |
1381 | } | |
1382 | ||
1383 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1384 | if (netlink_fd >= 0) |
1385 | return -EINVAL; | |
1386 | netlink_fd = fd; | |
912541b0 KS |
1387 | continue; |
1388 | } | |
1389 | ||
fcff1e72 | 1390 | return -EINVAL; |
912541b0 KS |
1391 | } |
1392 | ||
f59118ec | 1393 | if (ctrl_fd < 0) { |
8e766630 | 1394 | _cleanup_(udev_ctrl_unrefp) struct udev_ctrl *ctrl = NULL; |
f59118ec | 1395 | |
2024ed61 | 1396 | ctrl = udev_ctrl_new(); |
f59118ec TG |
1397 | if (!ctrl) |
1398 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1399 | ||
1400 | r = udev_ctrl_enable_receiving(ctrl); | |
1401 | if (r < 0) | |
1402 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1403 | ||
1404 | fd = udev_ctrl_get_fd(ctrl); | |
1405 | if (fd < 0) | |
1406 | return log_error_errno(EIO, "could not get ctrl fd"); | |
fcff1e72 | 1407 | |
f59118ec TG |
1408 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
1409 | if (ctrl_fd < 0) | |
1410 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1411 | } | |
1412 | ||
1413 | if (netlink_fd < 0) { | |
8e766630 | 1414 | _cleanup_(udev_monitor_unrefp) struct udev_monitor *monitor = NULL; |
f59118ec | 1415 | |
2024ed61 | 1416 | monitor = udev_monitor_new_from_netlink(NULL, "kernel"); |
f59118ec TG |
1417 | if (!monitor) |
1418 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1419 | ||
1420 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1421 | ||
1422 | r = udev_monitor_enable_receiving(monitor); | |
1423 | if (r < 0) | |
1424 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1425 | ||
1426 | fd = udev_monitor_get_fd(monitor); | |
1427 | if (fd < 0) | |
1428 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1429 | ||
1430 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
a92cf784 | 1431 | if (netlink_fd < 0) |
f59118ec TG |
1432 | return log_error_errno(errno, "could not dup netlink fd: %m"); |
1433 | } | |
fcff1e72 TG |
1434 | |
1435 | *rctrl = ctrl_fd; | |
1436 | *rnetlink = netlink_fd; | |
912541b0 | 1437 | |
912541b0 | 1438 | return 0; |
7459bcdc KS |
1439 | } |
1440 | ||
e6f86cac | 1441 | /* |
3f85ef0f | 1442 | * read the kernel command line, in case we need to get into debug mode |
1d84ad94 LP |
1443 | * udev.log_priority=<level> syslog priority |
1444 | * udev.children_max=<number of workers> events are fully serialized if set to 1 | |
1445 | * udev.exec_delay=<number of seconds> delay execution of every executed program | |
1446 | * udev.event_timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1447 | */ |
96287a49 | 1448 | static int parse_proc_cmdline_item(const char *key, const char *value, void *data) { |
92e72467 | 1449 | int r = 0; |
e6f86cac | 1450 | |
614a823c | 1451 | assert(key); |
e6f86cac | 1452 | |
614a823c TG |
1453 | if (!value) |
1454 | return 0; | |
e6f86cac | 1455 | |
1d84ad94 LP |
1456 | if (proc_cmdline_key_streq(key, "udev.log_priority")) { |
1457 | ||
1458 | if (proc_cmdline_value_missing(key, value)) | |
1459 | return 0; | |
1460 | ||
92e72467 ZJS |
1461 | r = util_log_priority(value); |
1462 | if (r >= 0) | |
1463 | log_set_max_level(r); | |
1d84ad94 LP |
1464 | |
1465 | } else if (proc_cmdline_key_streq(key, "udev.event_timeout")) { | |
1466 | ||
1467 | if (proc_cmdline_value_missing(key, value)) | |
1468 | return 0; | |
1469 | ||
92e72467 ZJS |
1470 | r = safe_atou64(value, &arg_event_timeout_usec); |
1471 | if (r >= 0) { | |
1472 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1473 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1474 | } | |
1d84ad94 LP |
1475 | |
1476 | } else if (proc_cmdline_key_streq(key, "udev.children_max")) { | |
1477 | ||
1478 | if (proc_cmdline_value_missing(key, value)) | |
1479 | return 0; | |
1480 | ||
020328e1 | 1481 | r = safe_atou(value, &arg_children_max); |
1d84ad94 LP |
1482 | |
1483 | } else if (proc_cmdline_key_streq(key, "udev.exec_delay")) { | |
1484 | ||
1485 | if (proc_cmdline_value_missing(key, value)) | |
1486 | return 0; | |
1487 | ||
614a823c | 1488 | r = safe_atoi(value, &arg_exec_delay); |
1d84ad94 LP |
1489 | |
1490 | } else if (startswith(key, "udev.")) | |
92e72467 | 1491 | log_warning("Unknown udev kernel command line option \"%s\"", key); |
614a823c | 1492 | |
92e72467 ZJS |
1493 | if (r < 0) |
1494 | log_warning_errno(r, "Failed to parse \"%s=%s\", ignoring: %m", key, value); | |
1d84ad94 | 1495 | |
614a823c | 1496 | return 0; |
e6f86cac KS |
1497 | } |
1498 | ||
37ec0fdd LP |
1499 | static int help(void) { |
1500 | _cleanup_free_ char *link = NULL; | |
1501 | int r; | |
1502 | ||
1503 | r = terminal_urlify_man("systemd-udevd.service", "8", &link); | |
1504 | if (r < 0) | |
1505 | return log_oom(); | |
1506 | ||
ed216e1f TG |
1507 | printf("%s [OPTIONS...]\n\n" |
1508 | "Manages devices.\n\n" | |
5ac0162c | 1509 | " -h --help Print this message\n" |
2d19c17e MF |
1510 | " -V --version Print version of the program\n" |
1511 | " -d --daemon Detach and run in the background\n" | |
1512 | " -D --debug Enable debug output\n" | |
1513 | " -c --children-max=INT Set maximum number of workers\n" | |
1514 | " -e --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1515 | " -t --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1516 | " -N --resolve-names=early|late|never\n" | |
5ac0162c | 1517 | " When to resolve users and groups\n" |
37ec0fdd LP |
1518 | "\nSee the %s for details.\n" |
1519 | , program_invocation_short_name | |
1520 | , link | |
1521 | ); | |
1522 | ||
1523 | return 0; | |
ed216e1f TG |
1524 | } |
1525 | ||
bba7a484 | 1526 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1527 | static const struct option options[] = { |
bba7a484 TG |
1528 | { "daemon", no_argument, NULL, 'd' }, |
1529 | { "debug", no_argument, NULL, 'D' }, | |
1530 | { "children-max", required_argument, NULL, 'c' }, | |
1531 | { "exec-delay", required_argument, NULL, 'e' }, | |
1532 | { "event-timeout", required_argument, NULL, 't' }, | |
1533 | { "resolve-names", required_argument, NULL, 'N' }, | |
1534 | { "help", no_argument, NULL, 'h' }, | |
1535 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1536 | {} |
1537 | }; | |
689a97f5 | 1538 | |
bba7a484 | 1539 | int c; |
689a97f5 | 1540 | |
bba7a484 TG |
1541 | assert(argc >= 0); |
1542 | assert(argv); | |
912541b0 | 1543 | |
e14b6f21 | 1544 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
f1e8664e | 1545 | int r; |
912541b0 | 1546 | |
bba7a484 | 1547 | switch (c) { |
912541b0 | 1548 | |
912541b0 | 1549 | case 'd': |
bba7a484 | 1550 | arg_daemonize = true; |
912541b0 KS |
1551 | break; |
1552 | case 'c': | |
020328e1 | 1553 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1554 | if (r < 0) |
1555 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1556 | break; |
1557 | case 'e': | |
6f5cf8a8 TG |
1558 | r = safe_atoi(optarg, &arg_exec_delay); |
1559 | if (r < 0) | |
1560 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1561 | break; |
9719859c | 1562 | case 't': |
f1e8664e TG |
1563 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1564 | if (r < 0) | |
65fea570 | 1565 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1566 | else { |
1567 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1568 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1569 | } | |
9719859c | 1570 | break; |
912541b0 | 1571 | case 'D': |
bba7a484 | 1572 | arg_debug = true; |
912541b0 KS |
1573 | break; |
1574 | case 'N': | |
090be865 | 1575 | if (streq(optarg, "early")) { |
bba7a484 | 1576 | arg_resolve_names = 1; |
090be865 | 1577 | } else if (streq(optarg, "late")) { |
bba7a484 | 1578 | arg_resolve_names = 0; |
090be865 | 1579 | } else if (streq(optarg, "never")) { |
bba7a484 | 1580 | arg_resolve_names = -1; |
912541b0 | 1581 | } else { |
9f6445e3 | 1582 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1583 | return 0; |
912541b0 KS |
1584 | } |
1585 | break; | |
1586 | case 'h': | |
37ec0fdd | 1587 | return help(); |
912541b0 | 1588 | case 'V': |
948aaa7c | 1589 | printf("%s\n", PACKAGE_VERSION); |
bba7a484 TG |
1590 | return 0; |
1591 | case '?': | |
1592 | return -EINVAL; | |
912541b0 | 1593 | default: |
bba7a484 TG |
1594 | assert_not_reached("Unhandled option"); |
1595 | ||
912541b0 KS |
1596 | } |
1597 | } | |
1598 | ||
bba7a484 TG |
1599 | return 1; |
1600 | } | |
1601 | ||
b7f74dd4 | 1602 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1603 | _cleanup_(manager_freep) Manager *manager = NULL; |
6d5e65f6 | 1604 | int r, fd_worker; |
c0c6806b TG |
1605 | |
1606 | assert(ret); | |
11b1dd8c TG |
1607 | assert(fd_ctrl >= 0); |
1608 | assert(fd_uevent >= 0); | |
c0c6806b TG |
1609 | |
1610 | manager = new0(Manager, 1); | |
1611 | if (!manager) | |
1612 | return log_oom(); | |
1613 | ||
e237d8cb TG |
1614 | manager->fd_inotify = -1; |
1615 | manager->worker_watch[WRITE_END] = -1; | |
1616 | manager->worker_watch[READ_END] = -1; | |
1617 | ||
2024ed61 | 1618 | udev_builtin_init(); |
b2d21d93 | 1619 | |
2024ed61 | 1620 | manager->rules = udev_rules_new(arg_resolve_names); |
ecb17862 TG |
1621 | if (!manager->rules) |
1622 | return log_error_errno(ENOMEM, "error reading rules"); | |
1623 | ||
40a57716 | 1624 | LIST_HEAD_INIT(manager->events); |
ecb17862 | 1625 | |
c26d1879 TG |
1626 | manager->cgroup = cgroup; |
1627 | ||
2024ed61 | 1628 | manager->ctrl = udev_ctrl_new_from_fd(fd_ctrl); |
f59118ec TG |
1629 | if (!manager->ctrl) |
1630 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e237d8cb | 1631 | |
2024ed61 | 1632 | manager->monitor = udev_monitor_new_from_netlink_fd(NULL, "kernel", fd_uevent); |
f59118ec TG |
1633 | if (!manager->monitor) |
1634 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1635 | |
1636 | /* unnamed socket from workers to the main daemon */ | |
1637 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1638 | if (r < 0) | |
1639 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1640 | ||
693d371d | 1641 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1642 | |
2ff48e98 | 1643 | r = setsockopt_int(fd_worker, SOL_SOCKET, SO_PASSCRED, true); |
e237d8cb | 1644 | if (r < 0) |
2ff48e98 | 1645 | return log_error_errno(r, "could not enable SO_PASSCRED: %m"); |
e237d8cb | 1646 | |
b7759e04 YW |
1647 | r = udev_watch_init(); |
1648 | if (r < 0) | |
1649 | return log_error_errno(r, "Failed to create inotify descriptor: %m"); | |
1650 | manager->fd_inotify = r; | |
e237d8cb | 1651 | |
2024ed61 | 1652 | udev_watch_restore(); |
e237d8cb TG |
1653 | |
1654 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1655 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1656 | |
49f997f3 TG |
1657 | r = sd_event_default(&manager->event); |
1658 | if (r < 0) | |
709f6e46 | 1659 | return log_error_errno(r, "could not allocate event loop: %m"); |
49f997f3 | 1660 | |
693d371d TG |
1661 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1662 | if (r < 0) | |
1663 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1664 | ||
1665 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1666 | if (r < 0) | |
1667 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1668 | ||
1669 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1670 | if (r < 0) | |
1671 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1672 | ||
1673 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1674 | if (r < 0) | |
1675 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1676 | ||
1677 | r = sd_event_set_watchdog(manager->event, true); | |
1678 | if (r < 0) | |
1679 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1680 | ||
11b1dd8c | 1681 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1682 | if (r < 0) |
1683 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1684 | ||
1685 | /* This needs to be after the inotify and uevent handling, to make sure | |
1686 | * that the ping is send back after fully processing the pending uevents | |
1687 | * (including the synthetic ones we may create due to inotify events). | |
1688 | */ | |
1689 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1690 | if (r < 0) | |
1691 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1692 | ||
1693 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1694 | if (r < 0) | |
1695 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1696 | ||
11b1dd8c | 1697 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); |
693d371d TG |
1698 | if (r < 0) |
1699 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1700 | ||
1701 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1702 | if (r < 0) | |
1703 | return log_error_errno(r, "error creating worker event source: %m"); | |
1704 | ||
1705 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1706 | if (r < 0) | |
1707 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1708 | |
1cc6c93a | 1709 | *ret = TAKE_PTR(manager); |
11b1dd8c | 1710 | |
86c3bece | 1711 | return 0; |
c0c6806b TG |
1712 | } |
1713 | ||
077fc5e2 | 1714 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1715 | _cleanup_(manager_freep) Manager *manager = NULL; |
077fc5e2 DH |
1716 | int r; |
1717 | ||
1718 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1719 | if (r < 0) { | |
1720 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1721 | goto exit; | |
1722 | } | |
1723 | ||
1724 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1725 | if (r < 0) | |
1726 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1727 | ||
1ef72b55 MS |
1728 | (void) sd_notifyf(false, |
1729 | "READY=1\n" | |
1730 | "STATUS=Processing with %u children at max", arg_children_max); | |
077fc5e2 DH |
1731 | |
1732 | r = sd_event_loop(manager->event); | |
1733 | if (r < 0) { | |
1734 | log_error_errno(r, "event loop failed: %m"); | |
1735 | goto exit; | |
1736 | } | |
1737 | ||
1738 | sd_event_get_exit_code(manager->event, &r); | |
1739 | ||
1740 | exit: | |
1741 | sd_notify(false, | |
1742 | "STOPPING=1\n" | |
1743 | "STATUS=Shutting down..."); | |
1744 | if (manager) | |
1745 | udev_ctrl_cleanup(manager->ctrl); | |
1746 | return r; | |
1747 | } | |
1748 | ||
1749 | int main(int argc, char *argv[]) { | |
c26d1879 | 1750 | _cleanup_free_ char *cgroup = NULL; |
efa1606e | 1751 | int fd_ctrl = -1, fd_uevent = -1; |
e5d7bce1 | 1752 | int r; |
bba7a484 | 1753 | |
bba7a484 | 1754 | log_set_target(LOG_TARGET_AUTO); |
b237a168 | 1755 | udev_parse_config(); |
bba7a484 TG |
1756 | log_parse_environment(); |
1757 | log_open(); | |
1758 | ||
bba7a484 TG |
1759 | r = parse_argv(argc, argv); |
1760 | if (r <= 0) | |
1761 | goto exit; | |
1762 | ||
1d84ad94 | 1763 | r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX); |
614a823c TG |
1764 | if (r < 0) |
1765 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1766 | |
78d3e041 KS |
1767 | if (arg_debug) { |
1768 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1769 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1770 | } |
bba7a484 | 1771 | |
6174a243 YW |
1772 | log_set_max_level_realm(LOG_REALM_SYSTEMD, log_get_max_level()); |
1773 | ||
fba868fa LP |
1774 | r = must_be_root(); |
1775 | if (r < 0) | |
912541b0 | 1776 | goto exit; |
912541b0 | 1777 | |
712cebf1 TG |
1778 | if (arg_children_max == 0) { |
1779 | cpu_set_t cpu_set; | |
e438c57a | 1780 | unsigned long mem_limit; |
ebc164ef | 1781 | |
712cebf1 | 1782 | arg_children_max = 8; |
d457ff83 | 1783 | |
ece174c5 | 1784 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
faae64fa | 1785 | arg_children_max += CPU_COUNT(&cpu_set) * 8; |
912541b0 | 1786 | |
e438c57a MW |
1787 | mem_limit = physical_memory() / (128LU*1024*1024); |
1788 | arg_children_max = MAX(10U, MIN(arg_children_max, mem_limit)); | |
1789 | ||
712cebf1 | 1790 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1791 | } |
912541b0 | 1792 | |
712cebf1 TG |
1793 | /* set umask before creating any file/directory */ |
1794 | r = chdir("/"); | |
1795 | if (r < 0) { | |
1796 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1797 | goto exit; | |
1798 | } | |
194bbe33 | 1799 | |
712cebf1 | 1800 | umask(022); |
912541b0 | 1801 | |
c3dacc8b | 1802 | r = mac_selinux_init(); |
712cebf1 TG |
1803 | if (r < 0) { |
1804 | log_error_errno(r, "could not initialize labelling: %m"); | |
1805 | goto exit; | |
912541b0 KS |
1806 | } |
1807 | ||
dae8b82e ZJS |
1808 | r = mkdir_errno_wrapper("/run/udev", 0755); |
1809 | if (r < 0 && r != -EEXIST) { | |
1810 | log_error_errno(r, "could not create /run/udev: %m"); | |
712cebf1 TG |
1811 | goto exit; |
1812 | } | |
1813 | ||
03cfe0d5 | 1814 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1815 | |
c26d1879 TG |
1816 | if (getppid() == 1) { |
1817 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1818 | we only do this on systemd systems, and only if we are directly spawned | |
1819 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1820 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
11b9fb15 | 1821 | if (r < 0) { |
a2d61f07 | 1822 | if (IN_SET(r, -ENOENT, -ENOMEDIUM)) |
11b9fb15 TG |
1823 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1824 | else | |
1825 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1826 | } | |
c26d1879 TG |
1827 | } |
1828 | ||
b7f74dd4 TG |
1829 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1830 | if (r < 0) { | |
1831 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1832 | goto exit; | |
1833 | } | |
1834 | ||
bba7a484 | 1835 | if (arg_daemonize) { |
912541b0 | 1836 | pid_t pid; |
912541b0 | 1837 | |
948aaa7c | 1838 | log_info("starting version " PACKAGE_VERSION); |
3cbb2057 | 1839 | |
40e749b5 | 1840 | /* connect /dev/null to stdin, stdout, stderr */ |
c76cf844 AK |
1841 | if (log_get_max_level() < LOG_DEBUG) { |
1842 | r = make_null_stdio(); | |
1843 | if (r < 0) | |
1844 | log_warning_errno(r, "Failed to redirect standard streams to /dev/null: %m"); | |
1845 | } | |
1846 | ||
912541b0 KS |
1847 | pid = fork(); |
1848 | switch (pid) { | |
1849 | case 0: | |
1850 | break; | |
1851 | case -1: | |
6af5e6a4 | 1852 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1853 | goto exit; |
1854 | default: | |
f53d1fcd TG |
1855 | mac_selinux_finish(); |
1856 | log_close(); | |
1857 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1858 | } |
1859 | ||
1860 | setsid(); | |
1861 | ||
76cdddfb YW |
1862 | r = set_oom_score_adjust(-1000); |
1863 | if (r < 0) | |
1864 | log_debug_errno(r, "Failed to adjust OOM score, ignoring: %m"); | |
7500cd5e | 1865 | } |
912541b0 | 1866 | |
077fc5e2 | 1867 | r = run(fd_ctrl, fd_uevent, cgroup); |
693d371d | 1868 | |
53921bfa | 1869 | exit: |
cc56fafe | 1870 | mac_selinux_finish(); |
baa30fbc | 1871 | log_close(); |
6af5e6a4 | 1872 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1873 | } |