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Commit | Line | Data |
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7fafc032 | 1 | /* |
1298001e | 2 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
2f6cbd19 | 3 | * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> |
bb38678e SJR |
4 | * Copyright (C) 2009 Canonical Ltd. |
5 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 | 6 | * |
55e9959b KS |
7 | * This program is free software: you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation, either version 2 of the License, or | |
10 | * (at your option) any later version. | |
7fafc032 | 11 | * |
55e9959b KS |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
7fafc032 | 16 | * |
55e9959b KS |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
7fafc032 KS |
19 | */ |
20 | ||
7fafc032 | 21 | #include <errno.h> |
618234a5 LP |
22 | #include <fcntl.h> |
23 | #include <getopt.h> | |
24 | #include <signal.h> | |
25 | #include <stdbool.h> | |
26 | #include <stddef.h> | |
7fafc032 KS |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
618234a5 | 30 | #include <sys/epoll.h> |
3ebdb81e | 31 | #include <sys/file.h> |
618234a5 LP |
32 | #include <sys/inotify.h> |
33 | #include <sys/ioctl.h> | |
34 | #include <sys/mount.h> | |
1e03b754 | 35 | #include <sys/prctl.h> |
1e03b754 | 36 | #include <sys/signalfd.h> |
618234a5 | 37 | #include <sys/socket.h> |
dc117daa | 38 | #include <sys/stat.h> |
618234a5 LP |
39 | #include <sys/time.h> |
40 | #include <sys/wait.h> | |
41 | #include <unistd.h> | |
7fafc032 | 42 | |
392ef7a2 | 43 | #include "sd-daemon.h" |
693d371d | 44 | #include "sd-event.h" |
8314de1d | 45 | |
194bbe33 | 46 | #include "cgroup-util.h" |
618234a5 | 47 | #include "cpu-set-util.h" |
5ba2dc25 | 48 | #include "dev-setup.h" |
618234a5 | 49 | #include "event-util.h" |
3ffd4af2 | 50 | #include "fd-util.h" |
a5c32cff | 51 | #include "fileio.h" |
6482f626 | 52 | #include "formats-util.h" |
a505965d | 53 | #include "hashmap.h" |
c004493c | 54 | #include "io-util.h" |
618234a5 | 55 | #include "netlink-util.h" |
6bedfcbb | 56 | #include "parse-util.h" |
618234a5 LP |
57 | #include "process-util.h" |
58 | #include "selinux-util.h" | |
59 | #include "signal-util.h" | |
07630cea | 60 | #include "string-util.h" |
618234a5 LP |
61 | #include "terminal-util.h" |
62 | #include "udev-util.h" | |
63 | #include "udev.h" | |
7fafc032 | 64 | |
bba7a484 TG |
65 | static bool arg_debug = false; |
66 | static int arg_daemonize = false; | |
67 | static int arg_resolve_names = 1; | |
020328e1 | 68 | static unsigned arg_children_max; |
bba7a484 TG |
69 | static int arg_exec_delay; |
70 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
71 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
c0c6806b TG |
72 | |
73 | typedef struct Manager { | |
74 | struct udev *udev; | |
693d371d | 75 | sd_event *event; |
c0c6806b | 76 | Hashmap *workers; |
ecb17862 | 77 | struct udev_list_node events; |
c26d1879 | 78 | const char *cgroup; |
cb49a4f2 | 79 | pid_t pid; /* the process that originally allocated the manager object */ |
c0c6806b | 80 | |
ecb17862 | 81 | struct udev_rules *rules; |
c0c6806b TG |
82 | struct udev_list properties; |
83 | ||
84 | struct udev_monitor *monitor; | |
85 | struct udev_ctrl *ctrl; | |
86 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e237d8cb | 87 | int fd_inotify; |
e237d8cb TG |
88 | int worker_watch[2]; |
89 | ||
693d371d TG |
90 | sd_event_source *ctrl_event; |
91 | sd_event_source *uevent_event; | |
92 | sd_event_source *inotify_event; | |
93 | ||
7c4c7e89 TG |
94 | usec_t last_usec; |
95 | ||
c0c6806b | 96 | bool stop_exec_queue:1; |
c0c6806b TG |
97 | bool exit:1; |
98 | } Manager; | |
1e03b754 | 99 | |
1e03b754 | 100 | enum event_state { |
912541b0 KS |
101 | EVENT_UNDEF, |
102 | EVENT_QUEUED, | |
103 | EVENT_RUNNING, | |
1e03b754 KS |
104 | }; |
105 | ||
106 | struct event { | |
912541b0 | 107 | struct udev_list_node node; |
cb49a4f2 | 108 | Manager *manager; |
912541b0 KS |
109 | struct udev *udev; |
110 | struct udev_device *dev; | |
6969c349 | 111 | struct udev_device *dev_kernel; |
c6aa11f2 | 112 | struct worker *worker; |
912541b0 | 113 | enum event_state state; |
912541b0 KS |
114 | unsigned long long int delaying_seqnum; |
115 | unsigned long long int seqnum; | |
116 | const char *devpath; | |
117 | size_t devpath_len; | |
118 | const char *devpath_old; | |
119 | dev_t devnum; | |
912541b0 | 120 | int ifindex; |
ea6039a3 | 121 | bool is_block; |
693d371d TG |
122 | sd_event_source *timeout_warning; |
123 | sd_event_source *timeout; | |
1e03b754 KS |
124 | }; |
125 | ||
9ec6e95b | 126 | static inline struct event *node_to_event(struct udev_list_node *node) { |
b27ee00b | 127 | return container_of(node, struct event, node); |
1e03b754 KS |
128 | } |
129 | ||
ecb17862 | 130 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
ff2c503d | 131 | |
1e03b754 | 132 | enum worker_state { |
912541b0 KS |
133 | WORKER_UNDEF, |
134 | WORKER_RUNNING, | |
135 | WORKER_IDLE, | |
136 | WORKER_KILLED, | |
1e03b754 KS |
137 | }; |
138 | ||
139 | struct worker { | |
c0c6806b | 140 | Manager *manager; |
912541b0 | 141 | struct udev_list_node node; |
912541b0 KS |
142 | int refcount; |
143 | pid_t pid; | |
144 | struct udev_monitor *monitor; | |
145 | enum worker_state state; | |
146 | struct event *event; | |
1e03b754 KS |
147 | }; |
148 | ||
149 | /* passed from worker to main process */ | |
150 | struct worker_message { | |
1e03b754 KS |
151 | }; |
152 | ||
c6aa11f2 | 153 | static void event_free(struct event *event) { |
cb49a4f2 TG |
154 | int r; |
155 | ||
c6aa11f2 TG |
156 | if (!event) |
157 | return; | |
158 | ||
912541b0 | 159 | udev_list_node_remove(&event->node); |
912541b0 | 160 | udev_device_unref(event->dev); |
6969c349 | 161 | udev_device_unref(event->dev_kernel); |
c6aa11f2 | 162 | |
693d371d TG |
163 | sd_event_source_unref(event->timeout_warning); |
164 | sd_event_source_unref(event->timeout); | |
165 | ||
c6aa11f2 TG |
166 | if (event->worker) |
167 | event->worker->event = NULL; | |
168 | ||
cb49a4f2 TG |
169 | assert(event->manager); |
170 | ||
171 | if (udev_list_node_is_empty(&event->manager->events)) { | |
172 | /* only clean up the queue from the process that created it */ | |
173 | if (event->manager->pid == getpid()) { | |
174 | r = unlink("/run/udev/queue"); | |
175 | if (r < 0) | |
176 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
177 | } | |
178 | } | |
179 | ||
912541b0 | 180 | free(event); |
aa8734ff | 181 | } |
7a770250 | 182 | |
c6aa11f2 TG |
183 | static void worker_free(struct worker *worker) { |
184 | if (!worker) | |
185 | return; | |
bc113de9 | 186 | |
c0c6806b TG |
187 | assert(worker->manager); |
188 | ||
189 | hashmap_remove(worker->manager->workers, UINT_TO_PTR(worker->pid)); | |
912541b0 | 190 | udev_monitor_unref(worker->monitor); |
c6aa11f2 TG |
191 | event_free(worker->event); |
192 | ||
c6aa11f2 | 193 | free(worker); |
ff2c503d KS |
194 | } |
195 | ||
c0c6806b | 196 | static void manager_workers_free(Manager *manager) { |
a505965d TG |
197 | struct worker *worker; |
198 | Iterator i; | |
ff2c503d | 199 | |
c0c6806b TG |
200 | assert(manager); |
201 | ||
202 | HASHMAP_FOREACH(worker, manager->workers, i) | |
c6aa11f2 | 203 | worker_free(worker); |
a505965d | 204 | |
c0c6806b | 205 | manager->workers = hashmap_free(manager->workers); |
fc465079 KS |
206 | } |
207 | ||
c0c6806b | 208 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { |
a505965d TG |
209 | _cleanup_free_ struct worker *worker = NULL; |
210 | int r; | |
3a19b32a TG |
211 | |
212 | assert(ret); | |
c0c6806b | 213 | assert(manager); |
3a19b32a TG |
214 | assert(worker_monitor); |
215 | assert(pid > 1); | |
216 | ||
217 | worker = new0(struct worker, 1); | |
218 | if (!worker) | |
219 | return -ENOMEM; | |
220 | ||
39c19cf1 | 221 | worker->refcount = 1; |
c0c6806b | 222 | worker->manager = manager; |
3a19b32a TG |
223 | /* close monitor, but keep address around */ |
224 | udev_monitor_disconnect(worker_monitor); | |
225 | worker->monitor = udev_monitor_ref(worker_monitor); | |
226 | worker->pid = pid; | |
a505965d | 227 | |
c0c6806b | 228 | r = hashmap_ensure_allocated(&manager->workers, NULL); |
a505965d TG |
229 | if (r < 0) |
230 | return r; | |
231 | ||
c0c6806b | 232 | r = hashmap_put(manager->workers, UINT_TO_PTR(pid), worker); |
a505965d TG |
233 | if (r < 0) |
234 | return r; | |
235 | ||
3a19b32a | 236 | *ret = worker; |
a505965d | 237 | worker = NULL; |
3a19b32a TG |
238 | |
239 | return 0; | |
240 | } | |
241 | ||
4fa4d885 TG |
242 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
243 | struct event *event = userdata; | |
244 | ||
245 | assert(event); | |
246 | assert(event->worker); | |
247 | ||
248 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
249 | event->worker->state = WORKER_KILLED; | |
250 | ||
251 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
252 | ||
253 | return 1; | |
254 | } | |
255 | ||
256 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
257 | struct event *event = userdata; | |
258 | ||
259 | assert(event); | |
260 | ||
261 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
262 | ||
263 | return 1; | |
264 | } | |
265 | ||
39c19cf1 | 266 | static void worker_attach_event(struct worker *worker, struct event *event) { |
693d371d TG |
267 | sd_event *e; |
268 | uint64_t usec; | |
693d371d | 269 | |
c6aa11f2 | 270 | assert(worker); |
693d371d | 271 | assert(worker->manager); |
c6aa11f2 TG |
272 | assert(event); |
273 | assert(!event->worker); | |
274 | assert(!worker->event); | |
275 | ||
39c19cf1 | 276 | worker->state = WORKER_RUNNING; |
39c19cf1 TG |
277 | worker->event = event; |
278 | event->state = EVENT_RUNNING; | |
c6aa11f2 | 279 | event->worker = worker; |
693d371d TG |
280 | |
281 | e = worker->manager->event; | |
282 | ||
38a03f06 | 283 | assert_se(sd_event_now(e, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
284 | |
285 | (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), | |
286 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); | |
287 | ||
288 | (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), | |
289 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); | |
39c19cf1 TG |
290 | } |
291 | ||
e237d8cb TG |
292 | static void manager_free(Manager *manager) { |
293 | if (!manager) | |
294 | return; | |
295 | ||
b2d21d93 TG |
296 | udev_builtin_exit(manager->udev); |
297 | ||
693d371d TG |
298 | sd_event_source_unref(manager->ctrl_event); |
299 | sd_event_source_unref(manager->uevent_event); | |
300 | sd_event_source_unref(manager->inotify_event); | |
301 | ||
e237d8cb | 302 | udev_unref(manager->udev); |
693d371d | 303 | sd_event_unref(manager->event); |
e237d8cb TG |
304 | manager_workers_free(manager); |
305 | event_queue_cleanup(manager, EVENT_UNDEF); | |
306 | ||
307 | udev_monitor_unref(manager->monitor); | |
308 | udev_ctrl_unref(manager->ctrl); | |
309 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
310 | ||
311 | udev_list_cleanup(&manager->properties); | |
312 | udev_rules_unref(manager->rules); | |
e237d8cb | 313 | |
e237d8cb TG |
314 | safe_close(manager->fd_inotify); |
315 | safe_close_pair(manager->worker_watch); | |
316 | ||
317 | free(manager); | |
318 | } | |
319 | ||
320 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
321 | ||
9a73bd7c TG |
322 | static int worker_send_message(int fd) { |
323 | struct worker_message message = {}; | |
324 | ||
325 | return loop_write(fd, &message, sizeof(message), false); | |
326 | } | |
327 | ||
c0c6806b | 328 | static void worker_spawn(Manager *manager, struct event *event) { |
912541b0 | 329 | struct udev *udev = event->udev; |
3a19b32a | 330 | _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; |
912541b0 | 331 | pid_t pid; |
b6aab8ef | 332 | int r = 0; |
912541b0 KS |
333 | |
334 | /* listen for new events */ | |
335 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
336 | if (worker_monitor == NULL) | |
337 | return; | |
338 | /* allow the main daemon netlink address to send devices to the worker */ | |
c0c6806b | 339 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
b6aab8ef TG |
340 | r = udev_monitor_enable_receiving(worker_monitor); |
341 | if (r < 0) | |
342 | log_error_errno(r, "worker: could not enable receiving of device: %m"); | |
912541b0 | 343 | |
912541b0 KS |
344 | pid = fork(); |
345 | switch (pid) { | |
346 | case 0: { | |
347 | struct udev_device *dev = NULL; | |
1c4baffc | 348 | _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; |
912541b0 | 349 | int fd_monitor; |
e237d8cb | 350 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
2dd9f98d TG |
351 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
352 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
912541b0 | 353 | sigset_t mask; |
912541b0 | 354 | |
43095991 | 355 | /* take initial device from queue */ |
912541b0 KS |
356 | dev = event->dev; |
357 | event->dev = NULL; | |
358 | ||
39fd2ca1 TG |
359 | unsetenv("NOTIFY_SOCKET"); |
360 | ||
c0c6806b | 361 | manager_workers_free(manager); |
ecb17862 | 362 | event_queue_cleanup(manager, EVENT_UNDEF); |
6d1b1e0b | 363 | |
e237d8cb | 364 | manager->monitor = udev_monitor_unref(manager->monitor); |
6d1b1e0b | 365 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 366 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
693d371d | 367 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 368 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
912541b0 | 369 | |
693d371d TG |
370 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
371 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
372 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
373 | ||
374 | manager->event = sd_event_unref(manager->event); | |
375 | ||
912541b0 KS |
376 | sigfillset(&mask); |
377 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
378 | if (fd_signal < 0) { | |
6af5e6a4 | 379 | r = log_error_errno(errno, "error creating signalfd %m"); |
912541b0 KS |
380 | goto out; |
381 | } | |
2dd9f98d TG |
382 | ep_signal.data.fd = fd_signal; |
383 | ||
384 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
385 | ep_monitor.data.fd = fd_monitor; | |
912541b0 KS |
386 | |
387 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
388 | if (fd_ep < 0) { | |
6af5e6a4 | 389 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
912541b0 KS |
390 | goto out; |
391 | } | |
392 | ||
912541b0 KS |
393 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
394 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
6af5e6a4 | 395 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
912541b0 KS |
396 | goto out; |
397 | } | |
398 | ||
399 | /* request TERM signal if parent exits */ | |
400 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
401 | ||
145dae7e | 402 | /* reset OOM score, we only protect the main daemon */ |
ad118bda | 403 | write_string_file("/proc/self/oom_score_adj", "0", 0); |
145dae7e | 404 | |
912541b0 KS |
405 | for (;;) { |
406 | struct udev_event *udev_event; | |
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)); |
912541b0 KS |
412 | udev_event = udev_event_new(dev); |
413 | if (udev_event == NULL) { | |
6af5e6a4 | 414 | r = -ENOMEM; |
912541b0 KS |
415 | goto out; |
416 | } | |
417 | ||
bba7a484 TG |
418 | if (arg_exec_delay > 0) |
419 | udev_event->exec_delay = arg_exec_delay; | |
912541b0 | 420 | |
3ebdb81e | 421 | /* |
2e5b17d0 | 422 | * Take a shared lock on the device node; this establishes |
3ebdb81e | 423 | * a concept of device "ownership" to serialize device |
2e5b17d0 | 424 | * access. External processes holding an exclusive lock will |
3ebdb81e | 425 | * cause udev to skip the event handling; in the case udev |
2e5b17d0 | 426 | * acquired the lock, the external process can block until |
3ebdb81e KS |
427 | * udev has finished its event handling. |
428 | */ | |
2e5b17d0 KS |
429 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
430 | streq_ptr("block", udev_device_get_subsystem(dev)) && | |
431 | !startswith(udev_device_get_sysname(dev), "dm-") && | |
432 | !startswith(udev_device_get_sysname(dev), "md")) { | |
3ebdb81e KS |
433 | struct udev_device *d = dev; |
434 | ||
435 | if (streq_ptr("partition", udev_device_get_devtype(d))) | |
436 | d = udev_device_get_parent(d); | |
437 | ||
438 | if (d) { | |
439 | fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
440 | if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { | |
56f64d95 | 441 | log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); |
3d06f418 | 442 | fd_lock = safe_close(fd_lock); |
3ebdb81e KS |
443 | goto skip; |
444 | } | |
445 | } | |
446 | } | |
447 | ||
4c83d994 TG |
448 | /* needed for renaming netifs */ |
449 | udev_event->rtnl = rtnl; | |
450 | ||
912541b0 | 451 | /* apply rules, create node, symlinks */ |
adeba500 KS |
452 | udev_event_execute_rules(udev_event, |
453 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
c0c6806b | 454 | &manager->properties, |
8314de1d | 455 | manager->rules); |
adeba500 KS |
456 | |
457 | udev_event_execute_run(udev_event, | |
8314de1d | 458 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 459 | |
523c620b TG |
460 | if (udev_event->rtnl) |
461 | /* in case rtnl was initialized */ | |
1c4baffc | 462 | rtnl = sd_netlink_ref(udev_event->rtnl); |
4c83d994 | 463 | |
912541b0 | 464 | /* apply/restore inotify watch */ |
bf9bead1 | 465 | if (udev_event->inotify_watch) { |
912541b0 KS |
466 | udev_watch_begin(udev, dev); |
467 | udev_device_update_db(dev); | |
468 | } | |
469 | ||
3d06f418 | 470 | safe_close(fd_lock); |
3ebdb81e | 471 | |
912541b0 KS |
472 | /* send processed event back to libudev listeners */ |
473 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
474 | ||
3ebdb81e | 475 | skip: |
4914cb2d | 476 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 477 | |
912541b0 | 478 | /* send udevd the result of the event execution */ |
e237d8cb | 479 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 480 | if (r < 0) |
9a73bd7c | 481 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 482 | udev_device_get_seqnum(dev)); |
912541b0 KS |
483 | |
484 | udev_device_unref(dev); | |
485 | dev = NULL; | |
486 | ||
73814ca2 | 487 | udev_event_unref(udev_event); |
47e737dc | 488 | |
912541b0 KS |
489 | /* wait for more device messages from main udevd, or term signal */ |
490 | while (dev == NULL) { | |
491 | struct epoll_event ev[4]; | |
492 | int fdcount; | |
493 | int i; | |
494 | ||
8fef0ff2 | 495 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
496 | if (fdcount < 0) { |
497 | if (errno == EINTR) | |
498 | continue; | |
6af5e6a4 | 499 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
500 | goto out; |
501 | } | |
502 | ||
503 | for (i = 0; i < fdcount; i++) { | |
504 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
505 | dev = udev_monitor_receive_device(worker_monitor); | |
506 | break; | |
507 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
508 | struct signalfd_siginfo fdsi; | |
509 | ssize_t size; | |
510 | ||
511 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
512 | if (size != sizeof(struct signalfd_siginfo)) | |
513 | continue; | |
514 | switch (fdsi.ssi_signo) { | |
515 | case SIGTERM: | |
516 | goto out; | |
517 | } | |
518 | } | |
519 | } | |
520 | } | |
521 | } | |
82063a88 | 522 | out: |
912541b0 | 523 | udev_device_unref(dev); |
e237d8cb | 524 | manager_free(manager); |
baa30fbc | 525 | log_close(); |
8b46c3fc | 526 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
527 | } |
528 | case -1: | |
912541b0 | 529 | event->state = EVENT_QUEUED; |
56f64d95 | 530 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
531 | break; |
532 | default: | |
e03c7cc2 TG |
533 | { |
534 | struct worker *worker; | |
535 | ||
c0c6806b | 536 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 537 | if (r < 0) |
e03c7cc2 | 538 | return; |
e03c7cc2 | 539 | |
39c19cf1 TG |
540 | worker_attach_event(worker, event); |
541 | ||
1fa2f38f | 542 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
543 | break; |
544 | } | |
e03c7cc2 | 545 | } |
7fafc032 KS |
546 | } |
547 | ||
c0c6806b | 548 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
549 | struct worker *worker; |
550 | Iterator i; | |
912541b0 | 551 | |
c0c6806b TG |
552 | assert(manager); |
553 | assert(event); | |
554 | ||
555 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
556 | ssize_t count; |
557 | ||
558 | if (worker->state != WORKER_IDLE) | |
559 | continue; | |
560 | ||
c0c6806b | 561 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 562 | if (count < 0) { |
1fa2f38f ZJS |
563 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
564 | worker->pid, count); | |
912541b0 KS |
565 | kill(worker->pid, SIGKILL); |
566 | worker->state = WORKER_KILLED; | |
567 | continue; | |
568 | } | |
39c19cf1 | 569 | worker_attach_event(worker, event); |
912541b0 KS |
570 | return; |
571 | } | |
572 | ||
c0c6806b | 573 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 574 | if (arg_children_max > 1) |
c0c6806b | 575 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
576 | return; |
577 | } | |
578 | ||
579 | /* start new worker and pass initial device */ | |
c0c6806b | 580 | worker_spawn(manager, event); |
1e03b754 KS |
581 | } |
582 | ||
ecb17862 | 583 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 584 | struct event *event; |
cb49a4f2 | 585 | int r; |
912541b0 | 586 | |
ecb17862 TG |
587 | assert(manager); |
588 | assert(dev); | |
589 | ||
040e6896 TG |
590 | /* only one process can add events to the queue */ |
591 | if (manager->pid == 0) | |
592 | manager->pid = getpid(); | |
593 | ||
cb49a4f2 TG |
594 | assert(manager->pid == getpid()); |
595 | ||
955d98c9 | 596 | event = new0(struct event, 1); |
cb49a4f2 TG |
597 | if (!event) |
598 | return -ENOMEM; | |
912541b0 KS |
599 | |
600 | event->udev = udev_device_get_udev(dev); | |
cb49a4f2 | 601 | event->manager = manager; |
912541b0 | 602 | event->dev = dev; |
6969c349 TG |
603 | event->dev_kernel = udev_device_shallow_clone(dev); |
604 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
605 | event->seqnum = udev_device_get_seqnum(dev); |
606 | event->devpath = udev_device_get_devpath(dev); | |
607 | event->devpath_len = strlen(event->devpath); | |
608 | event->devpath_old = udev_device_get_devpath_old(dev); | |
609 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 610 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
611 | event->ifindex = udev_device_get_ifindex(dev); |
612 | ||
9f6445e3 | 613 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
614 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
615 | ||
616 | event->state = EVENT_QUEUED; | |
cb49a4f2 TG |
617 | |
618 | if (udev_list_node_is_empty(&manager->events)) { | |
619 | r = touch("/run/udev/queue"); | |
620 | if (r < 0) | |
621 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
622 | } | |
623 | ||
ecb17862 | 624 | udev_list_node_append(&event->node, &manager->events); |
cb49a4f2 | 625 | |
912541b0 | 626 | return 0; |
fc465079 KS |
627 | } |
628 | ||
c0c6806b | 629 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
630 | struct worker *worker; |
631 | Iterator i; | |
1e03b754 | 632 | |
c0c6806b TG |
633 | assert(manager); |
634 | ||
635 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
636 | if (worker->state == WORKER_KILLED) |
637 | continue; | |
1e03b754 | 638 | |
912541b0 KS |
639 | worker->state = WORKER_KILLED; |
640 | kill(worker->pid, SIGTERM); | |
641 | } | |
1e03b754 KS |
642 | } |
643 | ||
e3196993 | 644 | /* lookup event for identical, parent, child device */ |
ecb17862 | 645 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
912541b0 KS |
646 | struct udev_list_node *loop; |
647 | size_t common; | |
648 | ||
649 | /* check if queue contains events we depend on */ | |
ecb17862 | 650 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 KS |
651 | struct event *loop_event = node_to_event(loop); |
652 | ||
653 | /* we already found a later event, earlier can not block us, no need to check again */ | |
654 | if (loop_event->seqnum < event->delaying_seqnum) | |
655 | continue; | |
656 | ||
657 | /* event we checked earlier still exists, no need to check again */ | |
658 | if (loop_event->seqnum == event->delaying_seqnum) | |
659 | return true; | |
660 | ||
661 | /* found ourself, no later event can block us */ | |
662 | if (loop_event->seqnum >= event->seqnum) | |
663 | break; | |
664 | ||
665 | /* check major/minor */ | |
666 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
667 | return true; | |
668 | ||
669 | /* check network device ifindex */ | |
670 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
671 | return true; | |
672 | ||
673 | /* check our old name */ | |
090be865 | 674 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
675 | event->delaying_seqnum = loop_event->seqnum; |
676 | return true; | |
677 | } | |
678 | ||
679 | /* compare devpath */ | |
680 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
681 | ||
682 | /* one devpath is contained in the other? */ | |
683 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
684 | continue; | |
685 | ||
686 | /* identical device event found */ | |
687 | if (loop_event->devpath_len == event->devpath_len) { | |
688 | /* devices names might have changed/swapped in the meantime */ | |
689 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
690 | continue; | |
691 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
692 | continue; | |
693 | event->delaying_seqnum = loop_event->seqnum; | |
694 | return true; | |
695 | } | |
696 | ||
697 | /* parent device event found */ | |
698 | if (event->devpath[common] == '/') { | |
699 | event->delaying_seqnum = loop_event->seqnum; | |
700 | return true; | |
701 | } | |
702 | ||
703 | /* child device event found */ | |
704 | if (loop_event->devpath[common] == '/') { | |
705 | event->delaying_seqnum = loop_event->seqnum; | |
706 | return true; | |
707 | } | |
708 | ||
709 | /* no matching device */ | |
710 | continue; | |
711 | } | |
712 | ||
713 | return false; | |
7fafc032 KS |
714 | } |
715 | ||
693d371d TG |
716 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
717 | Manager *manager = userdata; | |
718 | ||
719 | assert(manager); | |
720 | ||
721 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
722 | ||
723 | sd_event_exit(manager->event, -ETIMEDOUT); | |
724 | ||
725 | return 1; | |
726 | } | |
727 | ||
62d43dac | 728 | static void manager_exit(Manager *manager) { |
693d371d TG |
729 | uint64_t usec; |
730 | int r; | |
62d43dac TG |
731 | |
732 | assert(manager); | |
733 | ||
734 | manager->exit = true; | |
735 | ||
b79aacbf TG |
736 | sd_notify(false, |
737 | "STOPPING=1\n" | |
738 | "STATUS=Starting shutdown..."); | |
739 | ||
62d43dac | 740 | /* close sources of new events and discard buffered events */ |
693d371d | 741 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
ab7854df | 742 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
62d43dac | 743 | |
693d371d | 744 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
ab7854df | 745 | manager->fd_inotify = safe_close(manager->fd_inotify); |
62d43dac | 746 | |
693d371d | 747 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); |
ab7854df | 748 | manager->monitor = udev_monitor_unref(manager->monitor); |
62d43dac TG |
749 | |
750 | /* discard queued events and kill workers */ | |
751 | event_queue_cleanup(manager, EVENT_QUEUED); | |
752 | manager_kill_workers(manager); | |
693d371d | 753 | |
38a03f06 | 754 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
755 | |
756 | r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), | |
757 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); | |
758 | if (r < 0) | |
759 | return; | |
62d43dac TG |
760 | } |
761 | ||
762 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
763 | static void manager_reload(Manager *manager) { | |
764 | ||
765 | assert(manager); | |
766 | ||
b79aacbf TG |
767 | sd_notify(false, |
768 | "RELOADING=1\n" | |
769 | "STATUS=Flushing configuration..."); | |
770 | ||
62d43dac TG |
771 | manager_kill_workers(manager); |
772 | manager->rules = udev_rules_unref(manager->rules); | |
773 | udev_builtin_exit(manager->udev); | |
b79aacbf TG |
774 | |
775 | sd_notify(false, | |
776 | "READY=1\n" | |
777 | "STATUS=Processing..."); | |
62d43dac TG |
778 | } |
779 | ||
c0c6806b | 780 | static void event_queue_start(Manager *manager) { |
912541b0 | 781 | struct udev_list_node *loop; |
693d371d | 782 | usec_t usec; |
8ab44e3f | 783 | |
c0c6806b TG |
784 | assert(manager); |
785 | ||
7c4c7e89 TG |
786 | if (udev_list_node_is_empty(&manager->events) || |
787 | manager->exit || manager->stop_exec_queue) | |
788 | return; | |
789 | ||
38a03f06 LP |
790 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
791 | /* check for changed config, every 3 seconds at most */ | |
792 | if (manager->last_usec == 0 || | |
793 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
794 | if (udev_rules_check_timestamp(manager->rules) || | |
795 | udev_builtin_validate(manager->udev)) | |
796 | manager_reload(manager); | |
693d371d | 797 | |
38a03f06 | 798 | manager->last_usec = usec; |
7c4c7e89 TG |
799 | } |
800 | ||
801 | udev_builtin_init(manager->udev); | |
802 | ||
803 | if (!manager->rules) { | |
804 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
805 | if (!manager->rules) | |
806 | return; | |
807 | } | |
808 | ||
ecb17862 | 809 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 | 810 | struct event *event = node_to_event(loop); |
0bc74ea7 | 811 | |
912541b0 KS |
812 | if (event->state != EVENT_QUEUED) |
813 | continue; | |
0bc74ea7 | 814 | |
912541b0 | 815 | /* do not start event if parent or child event is still running */ |
ecb17862 | 816 | if (is_devpath_busy(manager, event)) |
912541b0 | 817 | continue; |
fc465079 | 818 | |
c0c6806b | 819 | event_run(manager, event); |
912541b0 | 820 | } |
1e03b754 KS |
821 | } |
822 | ||
ecb17862 | 823 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
912541b0 | 824 | struct udev_list_node *loop, *tmp; |
ff2c503d | 825 | |
ecb17862 | 826 | udev_list_node_foreach_safe(loop, tmp, &manager->events) { |
912541b0 | 827 | struct event *event = node_to_event(loop); |
ff2c503d | 828 | |
912541b0 KS |
829 | if (match_type != EVENT_UNDEF && match_type != event->state) |
830 | continue; | |
ff2c503d | 831 | |
c6aa11f2 | 832 | event_free(event); |
912541b0 | 833 | } |
ff2c503d KS |
834 | } |
835 | ||
e82e8fa5 | 836 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
837 | Manager *manager = userdata; |
838 | ||
839 | assert(manager); | |
840 | ||
912541b0 KS |
841 | for (;;) { |
842 | struct worker_message msg; | |
979558f3 TG |
843 | struct iovec iovec = { |
844 | .iov_base = &msg, | |
845 | .iov_len = sizeof(msg), | |
846 | }; | |
847 | union { | |
848 | struct cmsghdr cmsghdr; | |
849 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
850 | } control = {}; | |
851 | struct msghdr msghdr = { | |
852 | .msg_iov = &iovec, | |
853 | .msg_iovlen = 1, | |
854 | .msg_control = &control, | |
855 | .msg_controllen = sizeof(control), | |
856 | }; | |
857 | struct cmsghdr *cmsg; | |
912541b0 | 858 | ssize_t size; |
979558f3 | 859 | struct ucred *ucred = NULL; |
a505965d | 860 | struct worker *worker; |
912541b0 | 861 | |
e82e8fa5 | 862 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 863 | if (size < 0) { |
738a7907 TG |
864 | if (errno == EINTR) |
865 | continue; | |
866 | else if (errno == EAGAIN) | |
867 | /* nothing more to read */ | |
868 | break; | |
979558f3 | 869 | |
e82e8fa5 | 870 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
871 | } else if (size != sizeof(struct worker_message)) { |
872 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 873 | continue; |
979558f3 TG |
874 | } |
875 | ||
2a1288ff | 876 | CMSG_FOREACH(cmsg, &msghdr) { |
979558f3 TG |
877 | if (cmsg->cmsg_level == SOL_SOCKET && |
878 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
879 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
880 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
881 | } | |
882 | ||
883 | if (!ucred || ucred->pid <= 0) { | |
884 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
885 | continue; | |
886 | } | |
912541b0 KS |
887 | |
888 | /* lookup worker who sent the signal */ | |
c0c6806b | 889 | worker = hashmap_get(manager->workers, UINT_TO_PTR(ucred->pid)); |
a505965d TG |
890 | if (!worker) { |
891 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
892 | continue; | |
912541b0 | 893 | } |
c0bbfd72 | 894 | |
a505965d TG |
895 | if (worker->state != WORKER_KILLED) |
896 | worker->state = WORKER_IDLE; | |
897 | ||
898 | /* worker returned */ | |
899 | event_free(worker->event); | |
912541b0 | 900 | } |
e82e8fa5 | 901 | |
8302fe5a TG |
902 | /* we have free workers, try to schedule events */ |
903 | event_queue_start(manager); | |
904 | ||
e82e8fa5 TG |
905 | return 1; |
906 | } | |
907 | ||
908 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 909 | Manager *manager = userdata; |
e82e8fa5 TG |
910 | struct udev_device *dev; |
911 | int r; | |
912 | ||
c0c6806b | 913 | assert(manager); |
e82e8fa5 | 914 | |
c0c6806b | 915 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
916 | if (dev) { |
917 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 918 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
919 | if (r < 0) |
920 | udev_device_unref(dev); | |
8302fe5a TG |
921 | else |
922 | /* we have fresh events, try to schedule them */ | |
923 | event_queue_start(manager); | |
e82e8fa5 TG |
924 | } |
925 | ||
926 | return 1; | |
88f4b648 KS |
927 | } |
928 | ||
3b47c739 | 929 | /* receive the udevd message from userspace */ |
e82e8fa5 | 930 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 931 | Manager *manager = userdata; |
e4f66b77 TG |
932 | _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; |
933 | _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 KS |
934 | const char *str; |
935 | int i; | |
936 | ||
c0c6806b | 937 | assert(manager); |
e4f66b77 | 938 | |
c0c6806b | 939 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 940 | if (!ctrl_conn) |
e82e8fa5 | 941 | return 1; |
912541b0 KS |
942 | |
943 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 944 | if (!ctrl_msg) |
e82e8fa5 | 945 | return 1; |
912541b0 KS |
946 | |
947 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
948 | if (i >= 0) { | |
ed14edc0 | 949 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 950 | log_set_max_level(i); |
c0c6806b | 951 | manager_kill_workers(manager); |
912541b0 KS |
952 | } |
953 | ||
954 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 955 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 956 | manager->stop_exec_queue = true; |
912541b0 KS |
957 | } |
958 | ||
959 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 960 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 961 | manager->stop_exec_queue = false; |
8302fe5a | 962 | event_queue_start(manager); |
912541b0 KS |
963 | } |
964 | ||
965 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 966 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 967 | manager_reload(manager); |
912541b0 KS |
968 | } |
969 | ||
970 | str = udev_ctrl_get_set_env(ctrl_msg); | |
971 | if (str != NULL) { | |
c0c6806b | 972 | _cleanup_free_ char *key = NULL; |
912541b0 KS |
973 | |
974 | key = strdup(str); | |
c0c6806b | 975 | if (key) { |
912541b0 KS |
976 | char *val; |
977 | ||
978 | val = strchr(key, '='); | |
979 | if (val != NULL) { | |
980 | val[0] = '\0'; | |
981 | val = &val[1]; | |
982 | if (val[0] == '\0') { | |
9f6445e3 | 983 | log_debug("udevd message (ENV) received, unset '%s'", key); |
c0c6806b | 984 | udev_list_entry_add(&manager->properties, key, NULL); |
912541b0 | 985 | } else { |
9f6445e3 | 986 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); |
c0c6806b | 987 | udev_list_entry_add(&manager->properties, key, val); |
912541b0 | 988 | } |
c0c6806b | 989 | } else |
9f6445e3 | 990 | log_error("wrong key format '%s'", key); |
912541b0 | 991 | } |
c0c6806b | 992 | manager_kill_workers(manager); |
912541b0 KS |
993 | } |
994 | ||
995 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
996 | if (i >= 0) { | |
9f6445e3 | 997 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 998 | arg_children_max = i; |
912541b0 KS |
999 | } |
1000 | ||
cb49a4f2 | 1001 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1002 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1003 | |
1004 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1005 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1006 | manager_exit(manager); |
c0c6806b TG |
1007 | /* keep reference to block the client until we exit |
1008 | TODO: deal with several blocking exit requests */ | |
1009 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1010 | } |
e4f66b77 | 1011 | |
e82e8fa5 | 1012 | return 1; |
88f4b648 | 1013 | } |
4a231017 | 1014 | |
f3a740a5 | 1015 | static int synthesize_change(struct udev_device *dev) { |
edd32000 | 1016 | char filename[UTIL_PATH_SIZE]; |
f3a740a5 | 1017 | int r; |
edd32000 | 1018 | |
f3a740a5 | 1019 | if (streq_ptr("block", udev_device_get_subsystem(dev)) && |
ede34445 | 1020 | streq_ptr("disk", udev_device_get_devtype(dev)) && |
638ca89c | 1021 | !startswith(udev_device_get_sysname(dev), "dm-")) { |
e9fc29f4 KS |
1022 | bool part_table_read = false; |
1023 | bool has_partitions = false; | |
ede34445 | 1024 | int fd; |
f3a740a5 KS |
1025 | struct udev *udev = udev_device_get_udev(dev); |
1026 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
1027 | struct udev_list_entry *item; | |
1028 | ||
ede34445 | 1029 | /* |
e9fc29f4 KS |
1030 | * Try to re-read the partition table. This only succeeds if |
1031 | * none of the devices is busy. The kernel returns 0 if no | |
1032 | * partition table is found, and we will not get an event for | |
1033 | * the disk. | |
ede34445 | 1034 | */ |
02ba8fb3 | 1035 | fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1036 | if (fd >= 0) { |
02ba8fb3 KS |
1037 | r = flock(fd, LOCK_EX|LOCK_NB); |
1038 | if (r >= 0) | |
1039 | r = ioctl(fd, BLKRRPART, 0); | |
1040 | ||
ede34445 KS |
1041 | close(fd); |
1042 | if (r >= 0) | |
e9fc29f4 | 1043 | part_table_read = true; |
ede34445 KS |
1044 | } |
1045 | ||
e9fc29f4 | 1046 | /* search for partitions */ |
f3a740a5 KS |
1047 | e = udev_enumerate_new(udev); |
1048 | if (!e) | |
1049 | return -ENOMEM; | |
1050 | ||
1051 | r = udev_enumerate_add_match_parent(e, dev); | |
1052 | if (r < 0) | |
1053 | return r; | |
1054 | ||
1055 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
1056 | if (r < 0) | |
1057 | return r; | |
1058 | ||
1059 | r = udev_enumerate_scan_devices(e); | |
47a3fa0f TA |
1060 | if (r < 0) |
1061 | return r; | |
e9fc29f4 KS |
1062 | |
1063 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1064 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1065 | ||
1066 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1067 | if (!d) | |
1068 | continue; | |
1069 | ||
1070 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1071 | continue; | |
1072 | ||
1073 | has_partitions = true; | |
1074 | break; | |
1075 | } | |
1076 | ||
1077 | /* | |
1078 | * We have partitions and re-read the table, the kernel already sent | |
1079 | * out a "change" event for the disk, and "remove/add" for all | |
1080 | * partitions. | |
1081 | */ | |
1082 | if (part_table_read && has_partitions) | |
1083 | return 0; | |
1084 | ||
1085 | /* | |
1086 | * We have partitions but re-reading the partition table did not | |
1087 | * work, synthesize "change" for the disk and all partitions. | |
1088 | */ | |
1089 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1090 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1091 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
e9fc29f4 | 1092 | |
f3a740a5 KS |
1093 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { |
1094 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1095 | ||
1096 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1097 | if (!d) | |
1098 | continue; | |
1099 | ||
1100 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1101 | continue; | |
1102 | ||
1103 | log_debug("device %s closed, synthesising partition '%s' 'change'", | |
1104 | udev_device_get_devnode(dev), udev_device_get_devnode(d)); | |
1105 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); | |
4c1fc3e4 | 1106 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
f3a740a5 | 1107 | } |
ede34445 KS |
1108 | |
1109 | return 0; | |
f3a740a5 KS |
1110 | } |
1111 | ||
ede34445 KS |
1112 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); |
1113 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1114 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
ede34445 | 1115 | |
f3a740a5 | 1116 | return 0; |
edd32000 KS |
1117 | } |
1118 | ||
e82e8fa5 | 1119 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1120 | Manager *manager = userdata; |
0254e944 | 1121 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1122 | struct inotify_event *e; |
1123 | ssize_t l; | |
912541b0 | 1124 | |
c0c6806b | 1125 | assert(manager); |
e82e8fa5 TG |
1126 | |
1127 | l = read(fd, &buffer, sizeof(buffer)); | |
f7c1ad4f LP |
1128 | if (l < 0) { |
1129 | if (errno == EAGAIN || errno == EINTR) | |
e82e8fa5 | 1130 | return 1; |
912541b0 | 1131 | |
f7c1ad4f | 1132 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1133 | } |
1134 | ||
f7c1ad4f | 1135 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
e82e8fa5 | 1136 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; |
912541b0 | 1137 | |
c0c6806b | 1138 | dev = udev_watch_lookup(manager->udev, e->wd); |
edd32000 KS |
1139 | if (!dev) |
1140 | continue; | |
912541b0 | 1141 | |
f7c1ad4f | 1142 | log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); |
a8389097 | 1143 | if (e->mask & IN_CLOSE_WRITE) { |
edd32000 | 1144 | synthesize_change(dev); |
a8389097 TG |
1145 | |
1146 | /* settle might be waiting on us to determine the queue | |
1147 | * state. If we just handled an inotify event, we might have | |
1148 | * generated a "change" event, but we won't have queued up | |
1149 | * the resultant uevent yet. Do that. | |
1150 | */ | |
c0c6806b | 1151 | on_uevent(NULL, -1, 0, manager); |
a8389097 | 1152 | } else if (e->mask & IN_IGNORED) |
c0c6806b | 1153 | udev_watch_end(manager->udev, dev); |
912541b0 KS |
1154 | } |
1155 | ||
e82e8fa5 | 1156 | return 1; |
bd284db1 SJR |
1157 | } |
1158 | ||
0561329d | 1159 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1160 | Manager *manager = userdata; |
1161 | ||
1162 | assert(manager); | |
1163 | ||
62d43dac | 1164 | manager_exit(manager); |
912541b0 | 1165 | |
e82e8fa5 TG |
1166 | return 1; |
1167 | } | |
912541b0 | 1168 | |
0561329d | 1169 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1170 | Manager *manager = userdata; |
1171 | ||
1172 | assert(manager); | |
1173 | ||
62d43dac | 1174 | manager_reload(manager); |
912541b0 | 1175 | |
e82e8fa5 TG |
1176 | return 1; |
1177 | } | |
912541b0 | 1178 | |
e82e8fa5 | 1179 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1180 | Manager *manager = userdata; |
1181 | ||
1182 | assert(manager); | |
1183 | ||
e82e8fa5 TG |
1184 | for (;;) { |
1185 | pid_t pid; | |
1186 | int status; | |
1187 | struct worker *worker; | |
d1317d02 | 1188 | |
e82e8fa5 TG |
1189 | pid = waitpid(-1, &status, WNOHANG); |
1190 | if (pid <= 0) | |
f29328d6 | 1191 | break; |
e82e8fa5 | 1192 | |
c0c6806b | 1193 | worker = hashmap_get(manager->workers, UINT_TO_PTR(pid)); |
e82e8fa5 TG |
1194 | if (!worker) { |
1195 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1196 | continue; |
912541b0 | 1197 | } |
e82e8fa5 TG |
1198 | |
1199 | if (WIFEXITED(status)) { | |
1200 | if (WEXITSTATUS(status) == 0) | |
1201 | log_debug("worker ["PID_FMT"] exited", pid); | |
1202 | else | |
1203 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1204 | } else if (WIFSIGNALED(status)) { | |
1205 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); | |
1206 | } else if (WIFSTOPPED(status)) { | |
1207 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1208 | continue; |
e82e8fa5 TG |
1209 | } else if (WIFCONTINUED(status)) { |
1210 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1211 | continue; |
e82e8fa5 TG |
1212 | } else |
1213 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1214 | ||
1215 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1216 | if (worker->event) { | |
1217 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1218 | /* delete state from disk */ | |
1219 | udev_device_delete_db(worker->event->dev); | |
1220 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1221 | /* forward kernel event without amending it */ | |
c0c6806b | 1222 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); |
e82e8fa5 TG |
1223 | } |
1224 | } | |
1225 | ||
1226 | worker_free(worker); | |
912541b0 | 1227 | } |
e82e8fa5 | 1228 | |
8302fe5a TG |
1229 | /* we can start new workers, try to schedule events */ |
1230 | event_queue_start(manager); | |
1231 | ||
e82e8fa5 | 1232 | return 1; |
f27125f9 | 1233 | } |
1234 | ||
693d371d TG |
1235 | static int on_post(sd_event_source *s, void *userdata) { |
1236 | Manager *manager = userdata; | |
1237 | int r; | |
1238 | ||
1239 | assert(manager); | |
1240 | ||
1241 | if (udev_list_node_is_empty(&manager->events)) { | |
1242 | /* no pending events */ | |
1243 | if (!hashmap_isempty(manager->workers)) { | |
1244 | /* there are idle workers */ | |
1245 | log_debug("cleanup idle workers"); | |
1246 | manager_kill_workers(manager); | |
1247 | } else { | |
1248 | /* we are idle */ | |
1249 | if (manager->exit) { | |
1250 | r = sd_event_exit(manager->event, 0); | |
1251 | if (r < 0) | |
1252 | return r; | |
1253 | } else if (manager->cgroup) | |
1254 | /* cleanup possible left-over processes in our cgroup */ | |
1255 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, false, true, NULL); | |
1256 | } | |
1257 | } | |
1258 | ||
1259 | return 1; | |
1260 | } | |
1261 | ||
fcff1e72 | 1262 | static int listen_fds(int *rctrl, int *rnetlink) { |
f59118ec | 1263 | _cleanup_udev_unref_ struct udev *udev = NULL; |
fcff1e72 | 1264 | int ctrl_fd = -1, netlink_fd = -1; |
f59118ec | 1265 | int fd, n, r; |
912541b0 | 1266 | |
fcff1e72 TG |
1267 | assert(rctrl); |
1268 | assert(rnetlink); | |
1269 | ||
912541b0 | 1270 | n = sd_listen_fds(true); |
fcff1e72 TG |
1271 | if (n < 0) |
1272 | return n; | |
912541b0 KS |
1273 | |
1274 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1275 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1276 | if (ctrl_fd >= 0) |
1277 | return -EINVAL; | |
1278 | ctrl_fd = fd; | |
912541b0 KS |
1279 | continue; |
1280 | } | |
1281 | ||
1282 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1283 | if (netlink_fd >= 0) |
1284 | return -EINVAL; | |
1285 | netlink_fd = fd; | |
912541b0 KS |
1286 | continue; |
1287 | } | |
1288 | ||
fcff1e72 | 1289 | return -EINVAL; |
912541b0 KS |
1290 | } |
1291 | ||
f59118ec TG |
1292 | if (ctrl_fd < 0) { |
1293 | _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL; | |
1294 | ||
1295 | udev = udev_new(); | |
1296 | if (!udev) | |
1297 | return -ENOMEM; | |
1298 | ||
1299 | ctrl = udev_ctrl_new(udev); | |
1300 | if (!ctrl) | |
1301 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1302 | ||
1303 | r = udev_ctrl_enable_receiving(ctrl); | |
1304 | if (r < 0) | |
1305 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1306 | ||
1307 | fd = udev_ctrl_get_fd(ctrl); | |
1308 | if (fd < 0) | |
1309 | return log_error_errno(EIO, "could not get ctrl fd"); | |
fcff1e72 | 1310 | |
f59118ec TG |
1311 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
1312 | if (ctrl_fd < 0) | |
1313 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1314 | } | |
1315 | ||
1316 | if (netlink_fd < 0) { | |
1317 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
1318 | ||
1319 | if (!udev) { | |
1320 | udev = udev_new(); | |
1321 | if (!udev) | |
1322 | return -ENOMEM; | |
1323 | } | |
1324 | ||
1325 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1326 | if (!monitor) | |
1327 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1328 | ||
1329 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1330 | ||
1331 | r = udev_monitor_enable_receiving(monitor); | |
1332 | if (r < 0) | |
1333 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1334 | ||
1335 | fd = udev_monitor_get_fd(monitor); | |
1336 | if (fd < 0) | |
1337 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1338 | ||
1339 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
1340 | if (ctrl_fd < 0) | |
1341 | return log_error_errno(errno, "could not dup netlink fd: %m"); | |
1342 | } | |
fcff1e72 TG |
1343 | |
1344 | *rctrl = ctrl_fd; | |
1345 | *rnetlink = netlink_fd; | |
912541b0 | 1346 | |
912541b0 | 1347 | return 0; |
7459bcdc KS |
1348 | } |
1349 | ||
e6f86cac | 1350 | /* |
3f85ef0f | 1351 | * read the kernel command line, in case we need to get into debug mode |
614a823c TG |
1352 | * udev.log-priority=<level> syslog priority |
1353 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1354 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1355 | * udev.event-timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1356 | */ |
614a823c | 1357 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
3567afa5 | 1358 | const char *full_key = key; |
74df0fca | 1359 | int r; |
e6f86cac | 1360 | |
614a823c | 1361 | assert(key); |
e6f86cac | 1362 | |
614a823c TG |
1363 | if (!value) |
1364 | return 0; | |
e6f86cac | 1365 | |
614a823c TG |
1366 | if (startswith(key, "rd.")) |
1367 | key += strlen("rd."); | |
e6f86cac | 1368 | |
614a823c TG |
1369 | if (startswith(key, "udev.")) |
1370 | key += strlen("udev."); | |
1371 | else | |
1372 | return 0; | |
e6f86cac | 1373 | |
614a823c TG |
1374 | if (streq(key, "log-priority")) { |
1375 | int prio; | |
e6f86cac | 1376 | |
614a823c | 1377 | prio = util_log_priority(value); |
e00f5bdd | 1378 | if (prio < 0) |
3567afa5 MS |
1379 | goto invalid; |
1380 | log_set_max_level(prio); | |
614a823c | 1381 | } else if (streq(key, "children-max")) { |
020328e1 | 1382 | r = safe_atou(value, &arg_children_max); |
614a823c | 1383 | if (r < 0) |
3567afa5 | 1384 | goto invalid; |
614a823c TG |
1385 | } else if (streq(key, "exec-delay")) { |
1386 | r = safe_atoi(value, &arg_exec_delay); | |
1387 | if (r < 0) | |
3567afa5 | 1388 | goto invalid; |
614a823c TG |
1389 | } else if (streq(key, "event-timeout")) { |
1390 | r = safe_atou64(value, &arg_event_timeout_usec); | |
1391 | if (r < 0) | |
3567afa5 MS |
1392 | goto invalid; |
1393 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1394 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
e6f86cac | 1395 | } |
614a823c | 1396 | |
3567afa5 MS |
1397 | return 0; |
1398 | invalid: | |
1399 | log_warning("invalid %s ignored: %s", full_key, value); | |
614a823c | 1400 | return 0; |
e6f86cac KS |
1401 | } |
1402 | ||
ed216e1f TG |
1403 | static void help(void) { |
1404 | printf("%s [OPTIONS...]\n\n" | |
1405 | "Manages devices.\n\n" | |
5ac0162c LP |
1406 | " -h --help Print this message\n" |
1407 | " --version Print version of the program\n" | |
1408 | " --daemon Detach and run in the background\n" | |
1409 | " --debug Enable debug output\n" | |
1410 | " --children-max=INT Set maximum number of workers\n" | |
1411 | " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1412 | " --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1413 | " --resolve-names=early|late|never\n" | |
1414 | " When to resolve users and groups\n" | |
ed216e1f TG |
1415 | , program_invocation_short_name); |
1416 | } | |
1417 | ||
bba7a484 | 1418 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1419 | static const struct option options[] = { |
bba7a484 TG |
1420 | { "daemon", no_argument, NULL, 'd' }, |
1421 | { "debug", no_argument, NULL, 'D' }, | |
1422 | { "children-max", required_argument, NULL, 'c' }, | |
1423 | { "exec-delay", required_argument, NULL, 'e' }, | |
1424 | { "event-timeout", required_argument, NULL, 't' }, | |
1425 | { "resolve-names", required_argument, NULL, 'N' }, | |
1426 | { "help", no_argument, NULL, 'h' }, | |
1427 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1428 | {} |
1429 | }; | |
689a97f5 | 1430 | |
bba7a484 | 1431 | int c; |
689a97f5 | 1432 | |
bba7a484 TG |
1433 | assert(argc >= 0); |
1434 | assert(argv); | |
912541b0 | 1435 | |
e14b6f21 | 1436 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
f1e8664e | 1437 | int r; |
912541b0 | 1438 | |
bba7a484 | 1439 | switch (c) { |
912541b0 | 1440 | |
912541b0 | 1441 | case 'd': |
bba7a484 | 1442 | arg_daemonize = true; |
912541b0 KS |
1443 | break; |
1444 | case 'c': | |
020328e1 | 1445 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1446 | if (r < 0) |
1447 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1448 | break; |
1449 | case 'e': | |
6f5cf8a8 TG |
1450 | r = safe_atoi(optarg, &arg_exec_delay); |
1451 | if (r < 0) | |
1452 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1453 | break; |
9719859c | 1454 | case 't': |
f1e8664e TG |
1455 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1456 | if (r < 0) | |
65fea570 | 1457 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1458 | else { |
1459 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1460 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1461 | } | |
9719859c | 1462 | break; |
912541b0 | 1463 | case 'D': |
bba7a484 | 1464 | arg_debug = true; |
912541b0 KS |
1465 | break; |
1466 | case 'N': | |
090be865 | 1467 | if (streq(optarg, "early")) { |
bba7a484 | 1468 | arg_resolve_names = 1; |
090be865 | 1469 | } else if (streq(optarg, "late")) { |
bba7a484 | 1470 | arg_resolve_names = 0; |
090be865 | 1471 | } else if (streq(optarg, "never")) { |
bba7a484 | 1472 | arg_resolve_names = -1; |
912541b0 | 1473 | } else { |
9f6445e3 | 1474 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1475 | return 0; |
912541b0 KS |
1476 | } |
1477 | break; | |
1478 | case 'h': | |
ed216e1f | 1479 | help(); |
bba7a484 | 1480 | return 0; |
912541b0 KS |
1481 | case 'V': |
1482 | printf("%s\n", VERSION); | |
bba7a484 TG |
1483 | return 0; |
1484 | case '?': | |
1485 | return -EINVAL; | |
912541b0 | 1486 | default: |
bba7a484 TG |
1487 | assert_not_reached("Unhandled option"); |
1488 | ||
912541b0 KS |
1489 | } |
1490 | } | |
1491 | ||
bba7a484 TG |
1492 | return 1; |
1493 | } | |
1494 | ||
b7f74dd4 | 1495 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1496 | _cleanup_(manager_freep) Manager *manager = NULL; |
11b1dd8c | 1497 | int r, fd_worker, one = 1; |
c0c6806b TG |
1498 | |
1499 | assert(ret); | |
11b1dd8c TG |
1500 | assert(fd_ctrl >= 0); |
1501 | assert(fd_uevent >= 0); | |
c0c6806b TG |
1502 | |
1503 | manager = new0(Manager, 1); | |
1504 | if (!manager) | |
1505 | return log_oom(); | |
1506 | ||
e237d8cb TG |
1507 | manager->fd_inotify = -1; |
1508 | manager->worker_watch[WRITE_END] = -1; | |
1509 | manager->worker_watch[READ_END] = -1; | |
1510 | ||
c0c6806b TG |
1511 | manager->udev = udev_new(); |
1512 | if (!manager->udev) | |
1513 | return log_error_errno(errno, "could not allocate udev context: %m"); | |
1514 | ||
b2d21d93 TG |
1515 | udev_builtin_init(manager->udev); |
1516 | ||
ecb17862 TG |
1517 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); |
1518 | if (!manager->rules) | |
1519 | return log_error_errno(ENOMEM, "error reading rules"); | |
1520 | ||
1521 | udev_list_node_init(&manager->events); | |
1522 | udev_list_init(manager->udev, &manager->properties, true); | |
1523 | ||
c26d1879 TG |
1524 | manager->cgroup = cgroup; |
1525 | ||
f59118ec TG |
1526 | manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); |
1527 | if (!manager->ctrl) | |
1528 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e237d8cb | 1529 | |
f59118ec TG |
1530 | manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); |
1531 | if (!manager->monitor) | |
1532 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1533 | |
1534 | /* unnamed socket from workers to the main daemon */ | |
1535 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1536 | if (r < 0) | |
1537 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1538 | ||
693d371d | 1539 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1540 | |
693d371d | 1541 | r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
e237d8cb TG |
1542 | if (r < 0) |
1543 | return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); | |
1544 | ||
1545 | manager->fd_inotify = udev_watch_init(manager->udev); | |
1546 | if (manager->fd_inotify < 0) | |
1547 | return log_error_errno(ENOMEM, "error initializing inotify"); | |
1548 | ||
1549 | udev_watch_restore(manager->udev); | |
1550 | ||
1551 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1552 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1553 | |
49f997f3 TG |
1554 | r = sd_event_default(&manager->event); |
1555 | if (r < 0) | |
1556 | return log_error_errno(errno, "could not allocate event loop: %m"); | |
1557 | ||
693d371d TG |
1558 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1559 | if (r < 0) | |
1560 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1561 | ||
1562 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1563 | if (r < 0) | |
1564 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1565 | ||
1566 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1567 | if (r < 0) | |
1568 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1569 | ||
1570 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1571 | if (r < 0) | |
1572 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1573 | ||
1574 | r = sd_event_set_watchdog(manager->event, true); | |
1575 | if (r < 0) | |
1576 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1577 | ||
11b1dd8c | 1578 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1579 | if (r < 0) |
1580 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1581 | ||
1582 | /* This needs to be after the inotify and uevent handling, to make sure | |
1583 | * that the ping is send back after fully processing the pending uevents | |
1584 | * (including the synthetic ones we may create due to inotify events). | |
1585 | */ | |
1586 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1587 | if (r < 0) | |
1588 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1589 | ||
1590 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1591 | if (r < 0) | |
1592 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1593 | ||
11b1dd8c | 1594 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); |
693d371d TG |
1595 | if (r < 0) |
1596 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1597 | ||
1598 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1599 | if (r < 0) | |
1600 | return log_error_errno(r, "error creating worker event source: %m"); | |
1601 | ||
1602 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1603 | if (r < 0) | |
1604 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1605 | |
11b1dd8c TG |
1606 | *ret = manager; |
1607 | manager = NULL; | |
1608 | ||
86c3bece | 1609 | return 0; |
c0c6806b TG |
1610 | } |
1611 | ||
077fc5e2 | 1612 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1613 | _cleanup_(manager_freep) Manager *manager = NULL; |
077fc5e2 DH |
1614 | int r; |
1615 | ||
1616 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1617 | if (r < 0) { | |
1618 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1619 | goto exit; | |
1620 | } | |
1621 | ||
1622 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1623 | if (r < 0) | |
1624 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1625 | ||
1626 | (void) sd_notify(false, | |
1627 | "READY=1\n" | |
1628 | "STATUS=Processing..."); | |
1629 | ||
1630 | r = sd_event_loop(manager->event); | |
1631 | if (r < 0) { | |
1632 | log_error_errno(r, "event loop failed: %m"); | |
1633 | goto exit; | |
1634 | } | |
1635 | ||
1636 | sd_event_get_exit_code(manager->event, &r); | |
1637 | ||
1638 | exit: | |
1639 | sd_notify(false, | |
1640 | "STOPPING=1\n" | |
1641 | "STATUS=Shutting down..."); | |
1642 | if (manager) | |
1643 | udev_ctrl_cleanup(manager->ctrl); | |
1644 | return r; | |
1645 | } | |
1646 | ||
1647 | int main(int argc, char *argv[]) { | |
c26d1879 | 1648 | _cleanup_free_ char *cgroup = NULL; |
b7f74dd4 | 1649 | int r, fd_ctrl, fd_uevent; |
bba7a484 | 1650 | |
bba7a484 TG |
1651 | log_set_target(LOG_TARGET_AUTO); |
1652 | log_parse_environment(); | |
1653 | log_open(); | |
1654 | ||
bba7a484 TG |
1655 | r = parse_argv(argc, argv); |
1656 | if (r <= 0) | |
1657 | goto exit; | |
1658 | ||
614a823c TG |
1659 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
1660 | if (r < 0) | |
1661 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1662 | |
78d3e041 KS |
1663 | if (arg_debug) { |
1664 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1665 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1666 | } |
bba7a484 | 1667 | |
912541b0 | 1668 | if (getuid() != 0) { |
6af5e6a4 | 1669 | r = log_error_errno(EPERM, "root privileges required"); |
912541b0 KS |
1670 | goto exit; |
1671 | } | |
1672 | ||
712cebf1 TG |
1673 | if (arg_children_max == 0) { |
1674 | cpu_set_t cpu_set; | |
ebc164ef | 1675 | |
712cebf1 | 1676 | arg_children_max = 8; |
d457ff83 | 1677 | |
ece174c5 | 1678 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
920b52e4 | 1679 | arg_children_max += CPU_COUNT(&cpu_set) * 2; |
912541b0 | 1680 | |
712cebf1 | 1681 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1682 | } |
912541b0 | 1683 | |
712cebf1 TG |
1684 | /* set umask before creating any file/directory */ |
1685 | r = chdir("/"); | |
1686 | if (r < 0) { | |
1687 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1688 | goto exit; | |
1689 | } | |
194bbe33 | 1690 | |
712cebf1 | 1691 | umask(022); |
912541b0 | 1692 | |
712cebf1 TG |
1693 | r = mac_selinux_init("/dev"); |
1694 | if (r < 0) { | |
1695 | log_error_errno(r, "could not initialize labelling: %m"); | |
1696 | goto exit; | |
912541b0 KS |
1697 | } |
1698 | ||
712cebf1 TG |
1699 | r = mkdir("/run/udev", 0755); |
1700 | if (r < 0 && errno != EEXIST) { | |
1701 | r = log_error_errno(errno, "could not create /run/udev: %m"); | |
1702 | goto exit; | |
1703 | } | |
1704 | ||
03cfe0d5 | 1705 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1706 | |
c26d1879 TG |
1707 | if (getppid() == 1) { |
1708 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1709 | we only do this on systemd systems, and only if we are directly spawned | |
1710 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1711 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
11b9fb15 | 1712 | if (r < 0) { |
e859aa9e | 1713 | if (r == -ENOENT || r == -ENOEXEC) |
11b9fb15 TG |
1714 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1715 | else | |
1716 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1717 | } | |
c26d1879 TG |
1718 | } |
1719 | ||
b7f74dd4 TG |
1720 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1721 | if (r < 0) { | |
1722 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1723 | goto exit; | |
1724 | } | |
1725 | ||
bba7a484 | 1726 | if (arg_daemonize) { |
912541b0 | 1727 | pid_t pid; |
912541b0 | 1728 | |
3cbb2057 TG |
1729 | log_info("starting version " VERSION); |
1730 | ||
40e749b5 TG |
1731 | /* connect /dev/null to stdin, stdout, stderr */ |
1732 | if (log_get_max_level() < LOG_DEBUG) | |
1733 | (void) make_null_stdio(); | |
1734 | ||
912541b0 KS |
1735 | pid = fork(); |
1736 | switch (pid) { | |
1737 | case 0: | |
1738 | break; | |
1739 | case -1: | |
6af5e6a4 | 1740 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1741 | goto exit; |
1742 | default: | |
f53d1fcd TG |
1743 | mac_selinux_finish(); |
1744 | log_close(); | |
1745 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1746 | } |
1747 | ||
1748 | setsid(); | |
1749 | ||
ad118bda | 1750 | write_string_file("/proc/self/oom_score_adj", "-1000", 0); |
7500cd5e | 1751 | } |
912541b0 | 1752 | |
077fc5e2 | 1753 | r = run(fd_ctrl, fd_uevent, cgroup); |
693d371d | 1754 | |
53921bfa | 1755 | exit: |
cc56fafe | 1756 | mac_selinux_finish(); |
baa30fbc | 1757 | log_close(); |
6af5e6a4 | 1758 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1759 | } |