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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 LP |
55 | #include "netlink-util.h" |
56 | #include "process-util.h" | |
57 | #include "selinux-util.h" | |
58 | #include "signal-util.h" | |
07630cea | 59 | #include "string-util.h" |
618234a5 LP |
60 | #include "terminal-util.h" |
61 | #include "udev-util.h" | |
62 | #include "udev.h" | |
7fafc032 | 63 | |
bba7a484 TG |
64 | static bool arg_debug = false; |
65 | static int arg_daemonize = false; | |
66 | static int arg_resolve_names = 1; | |
020328e1 | 67 | static unsigned arg_children_max; |
bba7a484 TG |
68 | static int arg_exec_delay; |
69 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
70 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
c0c6806b TG |
71 | |
72 | typedef struct Manager { | |
73 | struct udev *udev; | |
693d371d | 74 | sd_event *event; |
c0c6806b | 75 | Hashmap *workers; |
ecb17862 | 76 | struct udev_list_node events; |
c26d1879 | 77 | const char *cgroup; |
cb49a4f2 | 78 | pid_t pid; /* the process that originally allocated the manager object */ |
c0c6806b | 79 | |
ecb17862 | 80 | struct udev_rules *rules; |
c0c6806b TG |
81 | struct udev_list properties; |
82 | ||
83 | struct udev_monitor *monitor; | |
84 | struct udev_ctrl *ctrl; | |
85 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e237d8cb | 86 | int fd_inotify; |
e237d8cb TG |
87 | int worker_watch[2]; |
88 | ||
693d371d TG |
89 | sd_event_source *ctrl_event; |
90 | sd_event_source *uevent_event; | |
91 | sd_event_source *inotify_event; | |
92 | ||
7c4c7e89 TG |
93 | usec_t last_usec; |
94 | ||
c0c6806b | 95 | bool stop_exec_queue:1; |
c0c6806b TG |
96 | bool exit:1; |
97 | } Manager; | |
1e03b754 | 98 | |
1e03b754 | 99 | enum event_state { |
912541b0 KS |
100 | EVENT_UNDEF, |
101 | EVENT_QUEUED, | |
102 | EVENT_RUNNING, | |
1e03b754 KS |
103 | }; |
104 | ||
105 | struct event { | |
912541b0 | 106 | struct udev_list_node node; |
cb49a4f2 | 107 | Manager *manager; |
912541b0 KS |
108 | struct udev *udev; |
109 | struct udev_device *dev; | |
6969c349 | 110 | struct udev_device *dev_kernel; |
c6aa11f2 | 111 | struct worker *worker; |
912541b0 | 112 | enum event_state state; |
912541b0 KS |
113 | unsigned long long int delaying_seqnum; |
114 | unsigned long long int seqnum; | |
115 | const char *devpath; | |
116 | size_t devpath_len; | |
117 | const char *devpath_old; | |
118 | dev_t devnum; | |
912541b0 | 119 | int ifindex; |
ea6039a3 | 120 | bool is_block; |
693d371d TG |
121 | sd_event_source *timeout_warning; |
122 | sd_event_source *timeout; | |
1e03b754 KS |
123 | }; |
124 | ||
9ec6e95b | 125 | static inline struct event *node_to_event(struct udev_list_node *node) { |
b27ee00b | 126 | return container_of(node, struct event, node); |
1e03b754 KS |
127 | } |
128 | ||
ecb17862 | 129 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
ff2c503d | 130 | |
1e03b754 | 131 | enum worker_state { |
912541b0 KS |
132 | WORKER_UNDEF, |
133 | WORKER_RUNNING, | |
134 | WORKER_IDLE, | |
135 | WORKER_KILLED, | |
1e03b754 KS |
136 | }; |
137 | ||
138 | struct worker { | |
c0c6806b | 139 | Manager *manager; |
912541b0 | 140 | struct udev_list_node node; |
912541b0 KS |
141 | int refcount; |
142 | pid_t pid; | |
143 | struct udev_monitor *monitor; | |
144 | enum worker_state state; | |
145 | struct event *event; | |
1e03b754 KS |
146 | }; |
147 | ||
148 | /* passed from worker to main process */ | |
149 | struct worker_message { | |
1e03b754 KS |
150 | }; |
151 | ||
c6aa11f2 | 152 | static void event_free(struct event *event) { |
cb49a4f2 TG |
153 | int r; |
154 | ||
c6aa11f2 TG |
155 | if (!event) |
156 | return; | |
157 | ||
912541b0 | 158 | udev_list_node_remove(&event->node); |
912541b0 | 159 | udev_device_unref(event->dev); |
6969c349 | 160 | udev_device_unref(event->dev_kernel); |
c6aa11f2 | 161 | |
693d371d TG |
162 | sd_event_source_unref(event->timeout_warning); |
163 | sd_event_source_unref(event->timeout); | |
164 | ||
c6aa11f2 TG |
165 | if (event->worker) |
166 | event->worker->event = NULL; | |
167 | ||
cb49a4f2 TG |
168 | assert(event->manager); |
169 | ||
170 | if (udev_list_node_is_empty(&event->manager->events)) { | |
171 | /* only clean up the queue from the process that created it */ | |
172 | if (event->manager->pid == getpid()) { | |
173 | r = unlink("/run/udev/queue"); | |
174 | if (r < 0) | |
175 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
176 | } | |
177 | } | |
178 | ||
912541b0 | 179 | free(event); |
aa8734ff | 180 | } |
7a770250 | 181 | |
c6aa11f2 TG |
182 | static void worker_free(struct worker *worker) { |
183 | if (!worker) | |
184 | return; | |
bc113de9 | 185 | |
c0c6806b TG |
186 | assert(worker->manager); |
187 | ||
188 | hashmap_remove(worker->manager->workers, UINT_TO_PTR(worker->pid)); | |
912541b0 | 189 | udev_monitor_unref(worker->monitor); |
c6aa11f2 TG |
190 | event_free(worker->event); |
191 | ||
c6aa11f2 | 192 | free(worker); |
ff2c503d KS |
193 | } |
194 | ||
c0c6806b | 195 | static void manager_workers_free(Manager *manager) { |
a505965d TG |
196 | struct worker *worker; |
197 | Iterator i; | |
ff2c503d | 198 | |
c0c6806b TG |
199 | assert(manager); |
200 | ||
201 | HASHMAP_FOREACH(worker, manager->workers, i) | |
c6aa11f2 | 202 | worker_free(worker); |
a505965d | 203 | |
c0c6806b | 204 | manager->workers = hashmap_free(manager->workers); |
fc465079 KS |
205 | } |
206 | ||
c0c6806b | 207 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { |
a505965d TG |
208 | _cleanup_free_ struct worker *worker = NULL; |
209 | int r; | |
3a19b32a TG |
210 | |
211 | assert(ret); | |
c0c6806b | 212 | assert(manager); |
3a19b32a TG |
213 | assert(worker_monitor); |
214 | assert(pid > 1); | |
215 | ||
216 | worker = new0(struct worker, 1); | |
217 | if (!worker) | |
218 | return -ENOMEM; | |
219 | ||
39c19cf1 | 220 | worker->refcount = 1; |
c0c6806b | 221 | worker->manager = manager; |
3a19b32a TG |
222 | /* close monitor, but keep address around */ |
223 | udev_monitor_disconnect(worker_monitor); | |
224 | worker->monitor = udev_monitor_ref(worker_monitor); | |
225 | worker->pid = pid; | |
a505965d | 226 | |
c0c6806b | 227 | r = hashmap_ensure_allocated(&manager->workers, NULL); |
a505965d TG |
228 | if (r < 0) |
229 | return r; | |
230 | ||
c0c6806b | 231 | r = hashmap_put(manager->workers, UINT_TO_PTR(pid), worker); |
a505965d TG |
232 | if (r < 0) |
233 | return r; | |
234 | ||
3a19b32a | 235 | *ret = worker; |
a505965d | 236 | worker = NULL; |
3a19b32a TG |
237 | |
238 | return 0; | |
239 | } | |
240 | ||
4fa4d885 TG |
241 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
242 | struct event *event = userdata; | |
243 | ||
244 | assert(event); | |
245 | assert(event->worker); | |
246 | ||
247 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
248 | event->worker->state = WORKER_KILLED; | |
249 | ||
250 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
251 | ||
252 | return 1; | |
253 | } | |
254 | ||
255 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
256 | struct event *event = userdata; | |
257 | ||
258 | assert(event); | |
259 | ||
260 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
261 | ||
262 | return 1; | |
263 | } | |
264 | ||
39c19cf1 | 265 | static void worker_attach_event(struct worker *worker, struct event *event) { |
693d371d TG |
266 | sd_event *e; |
267 | uint64_t usec; | |
693d371d | 268 | |
c6aa11f2 | 269 | assert(worker); |
693d371d | 270 | assert(worker->manager); |
c6aa11f2 TG |
271 | assert(event); |
272 | assert(!event->worker); | |
273 | assert(!worker->event); | |
274 | ||
39c19cf1 | 275 | worker->state = WORKER_RUNNING; |
39c19cf1 TG |
276 | worker->event = event; |
277 | event->state = EVENT_RUNNING; | |
c6aa11f2 | 278 | event->worker = worker; |
693d371d TG |
279 | |
280 | e = worker->manager->event; | |
281 | ||
38a03f06 | 282 | assert_se(sd_event_now(e, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
283 | |
284 | (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), | |
285 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); | |
286 | ||
287 | (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), | |
288 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); | |
39c19cf1 TG |
289 | } |
290 | ||
e237d8cb TG |
291 | static void manager_free(Manager *manager) { |
292 | if (!manager) | |
293 | return; | |
294 | ||
b2d21d93 TG |
295 | udev_builtin_exit(manager->udev); |
296 | ||
693d371d TG |
297 | sd_event_source_unref(manager->ctrl_event); |
298 | sd_event_source_unref(manager->uevent_event); | |
299 | sd_event_source_unref(manager->inotify_event); | |
300 | ||
e237d8cb | 301 | udev_unref(manager->udev); |
693d371d | 302 | sd_event_unref(manager->event); |
e237d8cb TG |
303 | manager_workers_free(manager); |
304 | event_queue_cleanup(manager, EVENT_UNDEF); | |
305 | ||
306 | udev_monitor_unref(manager->monitor); | |
307 | udev_ctrl_unref(manager->ctrl); | |
308 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
309 | ||
310 | udev_list_cleanup(&manager->properties); | |
311 | udev_rules_unref(manager->rules); | |
e237d8cb | 312 | |
e237d8cb TG |
313 | safe_close(manager->fd_inotify); |
314 | safe_close_pair(manager->worker_watch); | |
315 | ||
316 | free(manager); | |
317 | } | |
318 | ||
319 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
320 | ||
9a73bd7c TG |
321 | static int worker_send_message(int fd) { |
322 | struct worker_message message = {}; | |
323 | ||
324 | return loop_write(fd, &message, sizeof(message), false); | |
325 | } | |
326 | ||
c0c6806b | 327 | static void worker_spawn(Manager *manager, struct event *event) { |
912541b0 | 328 | struct udev *udev = event->udev; |
3a19b32a | 329 | _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; |
912541b0 | 330 | pid_t pid; |
b6aab8ef | 331 | int r = 0; |
912541b0 KS |
332 | |
333 | /* listen for new events */ | |
334 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
335 | if (worker_monitor == NULL) | |
336 | return; | |
337 | /* allow the main daemon netlink address to send devices to the worker */ | |
c0c6806b | 338 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
b6aab8ef TG |
339 | r = udev_monitor_enable_receiving(worker_monitor); |
340 | if (r < 0) | |
341 | log_error_errno(r, "worker: could not enable receiving of device: %m"); | |
912541b0 | 342 | |
912541b0 KS |
343 | pid = fork(); |
344 | switch (pid) { | |
345 | case 0: { | |
346 | struct udev_device *dev = NULL; | |
1c4baffc | 347 | _cleanup_netlink_unref_ sd_netlink *rtnl = NULL; |
912541b0 | 348 | int fd_monitor; |
e237d8cb | 349 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
2dd9f98d TG |
350 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
351 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
912541b0 | 352 | sigset_t mask; |
912541b0 | 353 | |
43095991 | 354 | /* take initial device from queue */ |
912541b0 KS |
355 | dev = event->dev; |
356 | event->dev = NULL; | |
357 | ||
39fd2ca1 TG |
358 | unsetenv("NOTIFY_SOCKET"); |
359 | ||
c0c6806b | 360 | manager_workers_free(manager); |
ecb17862 | 361 | event_queue_cleanup(manager, EVENT_UNDEF); |
6d1b1e0b | 362 | |
e237d8cb | 363 | manager->monitor = udev_monitor_unref(manager->monitor); |
6d1b1e0b | 364 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 365 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
693d371d | 366 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 367 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
912541b0 | 368 | |
693d371d TG |
369 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
370 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
371 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
372 | ||
373 | manager->event = sd_event_unref(manager->event); | |
374 | ||
912541b0 KS |
375 | sigfillset(&mask); |
376 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
377 | if (fd_signal < 0) { | |
6af5e6a4 | 378 | r = log_error_errno(errno, "error creating signalfd %m"); |
912541b0 KS |
379 | goto out; |
380 | } | |
2dd9f98d TG |
381 | ep_signal.data.fd = fd_signal; |
382 | ||
383 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
384 | ep_monitor.data.fd = fd_monitor; | |
912541b0 KS |
385 | |
386 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
387 | if (fd_ep < 0) { | |
6af5e6a4 | 388 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
912541b0 KS |
389 | goto out; |
390 | } | |
391 | ||
912541b0 KS |
392 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
393 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
6af5e6a4 | 394 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
912541b0 KS |
395 | goto out; |
396 | } | |
397 | ||
398 | /* request TERM signal if parent exits */ | |
399 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
400 | ||
145dae7e | 401 | /* reset OOM score, we only protect the main daemon */ |
ad118bda | 402 | write_string_file("/proc/self/oom_score_adj", "0", 0); |
145dae7e | 403 | |
912541b0 KS |
404 | for (;;) { |
405 | struct udev_event *udev_event; | |
6af5e6a4 | 406 | int fd_lock = -1; |
912541b0 | 407 | |
3b64e4d4 TG |
408 | assert(dev); |
409 | ||
9f6445e3 | 410 | log_debug("seq %llu running", udev_device_get_seqnum(dev)); |
912541b0 KS |
411 | udev_event = udev_event_new(dev); |
412 | if (udev_event == NULL) { | |
6af5e6a4 | 413 | r = -ENOMEM; |
912541b0 KS |
414 | goto out; |
415 | } | |
416 | ||
bba7a484 TG |
417 | if (arg_exec_delay > 0) |
418 | udev_event->exec_delay = arg_exec_delay; | |
912541b0 | 419 | |
3ebdb81e | 420 | /* |
2e5b17d0 | 421 | * Take a shared lock on the device node; this establishes |
3ebdb81e | 422 | * a concept of device "ownership" to serialize device |
2e5b17d0 | 423 | * access. External processes holding an exclusive lock will |
3ebdb81e | 424 | * cause udev to skip the event handling; in the case udev |
2e5b17d0 | 425 | * acquired the lock, the external process can block until |
3ebdb81e KS |
426 | * udev has finished its event handling. |
427 | */ | |
2e5b17d0 KS |
428 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
429 | streq_ptr("block", udev_device_get_subsystem(dev)) && | |
430 | !startswith(udev_device_get_sysname(dev), "dm-") && | |
431 | !startswith(udev_device_get_sysname(dev), "md")) { | |
3ebdb81e KS |
432 | struct udev_device *d = dev; |
433 | ||
434 | if (streq_ptr("partition", udev_device_get_devtype(d))) | |
435 | d = udev_device_get_parent(d); | |
436 | ||
437 | if (d) { | |
438 | fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
439 | if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { | |
56f64d95 | 440 | log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); |
3d06f418 | 441 | fd_lock = safe_close(fd_lock); |
3ebdb81e KS |
442 | goto skip; |
443 | } | |
444 | } | |
445 | } | |
446 | ||
4c83d994 TG |
447 | /* needed for renaming netifs */ |
448 | udev_event->rtnl = rtnl; | |
449 | ||
912541b0 | 450 | /* apply rules, create node, symlinks */ |
adeba500 KS |
451 | udev_event_execute_rules(udev_event, |
452 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
c0c6806b | 453 | &manager->properties, |
8314de1d | 454 | manager->rules); |
adeba500 KS |
455 | |
456 | udev_event_execute_run(udev_event, | |
8314de1d | 457 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 458 | |
523c620b TG |
459 | if (udev_event->rtnl) |
460 | /* in case rtnl was initialized */ | |
1c4baffc | 461 | rtnl = sd_netlink_ref(udev_event->rtnl); |
4c83d994 | 462 | |
912541b0 | 463 | /* apply/restore inotify watch */ |
bf9bead1 | 464 | if (udev_event->inotify_watch) { |
912541b0 KS |
465 | udev_watch_begin(udev, dev); |
466 | udev_device_update_db(dev); | |
467 | } | |
468 | ||
3d06f418 | 469 | safe_close(fd_lock); |
3ebdb81e | 470 | |
912541b0 KS |
471 | /* send processed event back to libudev listeners */ |
472 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
473 | ||
3ebdb81e | 474 | skip: |
4914cb2d | 475 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 476 | |
912541b0 | 477 | /* send udevd the result of the event execution */ |
e237d8cb | 478 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 479 | if (r < 0) |
9a73bd7c | 480 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 481 | udev_device_get_seqnum(dev)); |
912541b0 KS |
482 | |
483 | udev_device_unref(dev); | |
484 | dev = NULL; | |
485 | ||
73814ca2 | 486 | udev_event_unref(udev_event); |
47e737dc | 487 | |
912541b0 KS |
488 | /* wait for more device messages from main udevd, or term signal */ |
489 | while (dev == NULL) { | |
490 | struct epoll_event ev[4]; | |
491 | int fdcount; | |
492 | int i; | |
493 | ||
8fef0ff2 | 494 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
495 | if (fdcount < 0) { |
496 | if (errno == EINTR) | |
497 | continue; | |
6af5e6a4 | 498 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
499 | goto out; |
500 | } | |
501 | ||
502 | for (i = 0; i < fdcount; i++) { | |
503 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
504 | dev = udev_monitor_receive_device(worker_monitor); | |
505 | break; | |
506 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
507 | struct signalfd_siginfo fdsi; | |
508 | ssize_t size; | |
509 | ||
510 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
511 | if (size != sizeof(struct signalfd_siginfo)) | |
512 | continue; | |
513 | switch (fdsi.ssi_signo) { | |
514 | case SIGTERM: | |
515 | goto out; | |
516 | } | |
517 | } | |
518 | } | |
519 | } | |
520 | } | |
82063a88 | 521 | out: |
912541b0 | 522 | udev_device_unref(dev); |
e237d8cb | 523 | manager_free(manager); |
baa30fbc | 524 | log_close(); |
8b46c3fc | 525 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
526 | } |
527 | case -1: | |
912541b0 | 528 | event->state = EVENT_QUEUED; |
56f64d95 | 529 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
530 | break; |
531 | default: | |
e03c7cc2 TG |
532 | { |
533 | struct worker *worker; | |
534 | ||
c0c6806b | 535 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 536 | if (r < 0) |
e03c7cc2 | 537 | return; |
e03c7cc2 | 538 | |
39c19cf1 TG |
539 | worker_attach_event(worker, event); |
540 | ||
1fa2f38f | 541 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
542 | break; |
543 | } | |
e03c7cc2 | 544 | } |
7fafc032 KS |
545 | } |
546 | ||
c0c6806b | 547 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
548 | struct worker *worker; |
549 | Iterator i; | |
912541b0 | 550 | |
c0c6806b TG |
551 | assert(manager); |
552 | assert(event); | |
553 | ||
554 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
555 | ssize_t count; |
556 | ||
557 | if (worker->state != WORKER_IDLE) | |
558 | continue; | |
559 | ||
c0c6806b | 560 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 561 | if (count < 0) { |
1fa2f38f ZJS |
562 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
563 | worker->pid, count); | |
912541b0 KS |
564 | kill(worker->pid, SIGKILL); |
565 | worker->state = WORKER_KILLED; | |
566 | continue; | |
567 | } | |
39c19cf1 | 568 | worker_attach_event(worker, event); |
912541b0 KS |
569 | return; |
570 | } | |
571 | ||
c0c6806b | 572 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 573 | if (arg_children_max > 1) |
c0c6806b | 574 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
575 | return; |
576 | } | |
577 | ||
578 | /* start new worker and pass initial device */ | |
c0c6806b | 579 | worker_spawn(manager, event); |
1e03b754 KS |
580 | } |
581 | ||
ecb17862 | 582 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 583 | struct event *event; |
cb49a4f2 | 584 | int r; |
912541b0 | 585 | |
ecb17862 TG |
586 | assert(manager); |
587 | assert(dev); | |
588 | ||
040e6896 TG |
589 | /* only one process can add events to the queue */ |
590 | if (manager->pid == 0) | |
591 | manager->pid = getpid(); | |
592 | ||
cb49a4f2 TG |
593 | assert(manager->pid == getpid()); |
594 | ||
955d98c9 | 595 | event = new0(struct event, 1); |
cb49a4f2 TG |
596 | if (!event) |
597 | return -ENOMEM; | |
912541b0 KS |
598 | |
599 | event->udev = udev_device_get_udev(dev); | |
cb49a4f2 | 600 | event->manager = manager; |
912541b0 | 601 | event->dev = dev; |
6969c349 TG |
602 | event->dev_kernel = udev_device_shallow_clone(dev); |
603 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
604 | event->seqnum = udev_device_get_seqnum(dev); |
605 | event->devpath = udev_device_get_devpath(dev); | |
606 | event->devpath_len = strlen(event->devpath); | |
607 | event->devpath_old = udev_device_get_devpath_old(dev); | |
608 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 609 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
610 | event->ifindex = udev_device_get_ifindex(dev); |
611 | ||
9f6445e3 | 612 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
613 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
614 | ||
615 | event->state = EVENT_QUEUED; | |
cb49a4f2 TG |
616 | |
617 | if (udev_list_node_is_empty(&manager->events)) { | |
618 | r = touch("/run/udev/queue"); | |
619 | if (r < 0) | |
620 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
621 | } | |
622 | ||
ecb17862 | 623 | udev_list_node_append(&event->node, &manager->events); |
cb49a4f2 | 624 | |
912541b0 | 625 | return 0; |
fc465079 KS |
626 | } |
627 | ||
c0c6806b | 628 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
629 | struct worker *worker; |
630 | Iterator i; | |
1e03b754 | 631 | |
c0c6806b TG |
632 | assert(manager); |
633 | ||
634 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
635 | if (worker->state == WORKER_KILLED) |
636 | continue; | |
1e03b754 | 637 | |
912541b0 KS |
638 | worker->state = WORKER_KILLED; |
639 | kill(worker->pid, SIGTERM); | |
640 | } | |
1e03b754 KS |
641 | } |
642 | ||
e3196993 | 643 | /* lookup event for identical, parent, child device */ |
ecb17862 | 644 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
912541b0 KS |
645 | struct udev_list_node *loop; |
646 | size_t common; | |
647 | ||
648 | /* check if queue contains events we depend on */ | |
ecb17862 | 649 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 KS |
650 | struct event *loop_event = node_to_event(loop); |
651 | ||
652 | /* we already found a later event, earlier can not block us, no need to check again */ | |
653 | if (loop_event->seqnum < event->delaying_seqnum) | |
654 | continue; | |
655 | ||
656 | /* event we checked earlier still exists, no need to check again */ | |
657 | if (loop_event->seqnum == event->delaying_seqnum) | |
658 | return true; | |
659 | ||
660 | /* found ourself, no later event can block us */ | |
661 | if (loop_event->seqnum >= event->seqnum) | |
662 | break; | |
663 | ||
664 | /* check major/minor */ | |
665 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
666 | return true; | |
667 | ||
668 | /* check network device ifindex */ | |
669 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
670 | return true; | |
671 | ||
672 | /* check our old name */ | |
090be865 | 673 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
674 | event->delaying_seqnum = loop_event->seqnum; |
675 | return true; | |
676 | } | |
677 | ||
678 | /* compare devpath */ | |
679 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
680 | ||
681 | /* one devpath is contained in the other? */ | |
682 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
683 | continue; | |
684 | ||
685 | /* identical device event found */ | |
686 | if (loop_event->devpath_len == event->devpath_len) { | |
687 | /* devices names might have changed/swapped in the meantime */ | |
688 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
689 | continue; | |
690 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
691 | continue; | |
692 | event->delaying_seqnum = loop_event->seqnum; | |
693 | return true; | |
694 | } | |
695 | ||
696 | /* parent device event found */ | |
697 | if (event->devpath[common] == '/') { | |
698 | event->delaying_seqnum = loop_event->seqnum; | |
699 | return true; | |
700 | } | |
701 | ||
702 | /* child device event found */ | |
703 | if (loop_event->devpath[common] == '/') { | |
704 | event->delaying_seqnum = loop_event->seqnum; | |
705 | return true; | |
706 | } | |
707 | ||
708 | /* no matching device */ | |
709 | continue; | |
710 | } | |
711 | ||
712 | return false; | |
7fafc032 KS |
713 | } |
714 | ||
693d371d TG |
715 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
716 | Manager *manager = userdata; | |
717 | ||
718 | assert(manager); | |
719 | ||
720 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
721 | ||
722 | sd_event_exit(manager->event, -ETIMEDOUT); | |
723 | ||
724 | return 1; | |
725 | } | |
726 | ||
62d43dac | 727 | static void manager_exit(Manager *manager) { |
693d371d TG |
728 | uint64_t usec; |
729 | int r; | |
62d43dac TG |
730 | |
731 | assert(manager); | |
732 | ||
733 | manager->exit = true; | |
734 | ||
b79aacbf TG |
735 | sd_notify(false, |
736 | "STOPPING=1\n" | |
737 | "STATUS=Starting shutdown..."); | |
738 | ||
62d43dac | 739 | /* close sources of new events and discard buffered events */ |
693d371d | 740 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
ab7854df | 741 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
62d43dac | 742 | |
693d371d | 743 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
ab7854df | 744 | manager->fd_inotify = safe_close(manager->fd_inotify); |
62d43dac | 745 | |
693d371d | 746 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); |
ab7854df | 747 | manager->monitor = udev_monitor_unref(manager->monitor); |
62d43dac TG |
748 | |
749 | /* discard queued events and kill workers */ | |
750 | event_queue_cleanup(manager, EVENT_QUEUED); | |
751 | manager_kill_workers(manager); | |
693d371d | 752 | |
38a03f06 | 753 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
754 | |
755 | r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), | |
756 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); | |
757 | if (r < 0) | |
758 | return; | |
62d43dac TG |
759 | } |
760 | ||
761 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
762 | static void manager_reload(Manager *manager) { | |
763 | ||
764 | assert(manager); | |
765 | ||
b79aacbf TG |
766 | sd_notify(false, |
767 | "RELOADING=1\n" | |
768 | "STATUS=Flushing configuration..."); | |
769 | ||
62d43dac TG |
770 | manager_kill_workers(manager); |
771 | manager->rules = udev_rules_unref(manager->rules); | |
772 | udev_builtin_exit(manager->udev); | |
b79aacbf TG |
773 | |
774 | sd_notify(false, | |
775 | "READY=1\n" | |
776 | "STATUS=Processing..."); | |
62d43dac TG |
777 | } |
778 | ||
c0c6806b | 779 | static void event_queue_start(Manager *manager) { |
912541b0 | 780 | struct udev_list_node *loop; |
693d371d | 781 | usec_t usec; |
8ab44e3f | 782 | |
c0c6806b TG |
783 | assert(manager); |
784 | ||
7c4c7e89 TG |
785 | if (udev_list_node_is_empty(&manager->events) || |
786 | manager->exit || manager->stop_exec_queue) | |
787 | return; | |
788 | ||
38a03f06 LP |
789 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
790 | /* check for changed config, every 3 seconds at most */ | |
791 | if (manager->last_usec == 0 || | |
792 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
793 | if (udev_rules_check_timestamp(manager->rules) || | |
794 | udev_builtin_validate(manager->udev)) | |
795 | manager_reload(manager); | |
693d371d | 796 | |
38a03f06 | 797 | manager->last_usec = usec; |
7c4c7e89 TG |
798 | } |
799 | ||
800 | udev_builtin_init(manager->udev); | |
801 | ||
802 | if (!manager->rules) { | |
803 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
804 | if (!manager->rules) | |
805 | return; | |
806 | } | |
807 | ||
ecb17862 | 808 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 | 809 | struct event *event = node_to_event(loop); |
0bc74ea7 | 810 | |
912541b0 KS |
811 | if (event->state != EVENT_QUEUED) |
812 | continue; | |
0bc74ea7 | 813 | |
912541b0 | 814 | /* do not start event if parent or child event is still running */ |
ecb17862 | 815 | if (is_devpath_busy(manager, event)) |
912541b0 | 816 | continue; |
fc465079 | 817 | |
c0c6806b | 818 | event_run(manager, event); |
912541b0 | 819 | } |
1e03b754 KS |
820 | } |
821 | ||
ecb17862 | 822 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
912541b0 | 823 | struct udev_list_node *loop, *tmp; |
ff2c503d | 824 | |
ecb17862 | 825 | udev_list_node_foreach_safe(loop, tmp, &manager->events) { |
912541b0 | 826 | struct event *event = node_to_event(loop); |
ff2c503d | 827 | |
912541b0 KS |
828 | if (match_type != EVENT_UNDEF && match_type != event->state) |
829 | continue; | |
ff2c503d | 830 | |
c6aa11f2 | 831 | event_free(event); |
912541b0 | 832 | } |
ff2c503d KS |
833 | } |
834 | ||
e82e8fa5 | 835 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
836 | Manager *manager = userdata; |
837 | ||
838 | assert(manager); | |
839 | ||
912541b0 KS |
840 | for (;;) { |
841 | struct worker_message msg; | |
979558f3 TG |
842 | struct iovec iovec = { |
843 | .iov_base = &msg, | |
844 | .iov_len = sizeof(msg), | |
845 | }; | |
846 | union { | |
847 | struct cmsghdr cmsghdr; | |
848 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
849 | } control = {}; | |
850 | struct msghdr msghdr = { | |
851 | .msg_iov = &iovec, | |
852 | .msg_iovlen = 1, | |
853 | .msg_control = &control, | |
854 | .msg_controllen = sizeof(control), | |
855 | }; | |
856 | struct cmsghdr *cmsg; | |
912541b0 | 857 | ssize_t size; |
979558f3 | 858 | struct ucred *ucred = NULL; |
a505965d | 859 | struct worker *worker; |
912541b0 | 860 | |
e82e8fa5 | 861 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 862 | if (size < 0) { |
738a7907 TG |
863 | if (errno == EINTR) |
864 | continue; | |
865 | else if (errno == EAGAIN) | |
866 | /* nothing more to read */ | |
867 | break; | |
979558f3 | 868 | |
e82e8fa5 | 869 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
870 | } else if (size != sizeof(struct worker_message)) { |
871 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 872 | continue; |
979558f3 TG |
873 | } |
874 | ||
2a1288ff | 875 | CMSG_FOREACH(cmsg, &msghdr) { |
979558f3 TG |
876 | if (cmsg->cmsg_level == SOL_SOCKET && |
877 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
878 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
879 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
880 | } | |
881 | ||
882 | if (!ucred || ucred->pid <= 0) { | |
883 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
884 | continue; | |
885 | } | |
912541b0 KS |
886 | |
887 | /* lookup worker who sent the signal */ | |
c0c6806b | 888 | worker = hashmap_get(manager->workers, UINT_TO_PTR(ucred->pid)); |
a505965d TG |
889 | if (!worker) { |
890 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
891 | continue; | |
912541b0 | 892 | } |
c0bbfd72 | 893 | |
a505965d TG |
894 | if (worker->state != WORKER_KILLED) |
895 | worker->state = WORKER_IDLE; | |
896 | ||
897 | /* worker returned */ | |
898 | event_free(worker->event); | |
912541b0 | 899 | } |
e82e8fa5 | 900 | |
8302fe5a TG |
901 | /* we have free workers, try to schedule events */ |
902 | event_queue_start(manager); | |
903 | ||
e82e8fa5 TG |
904 | return 1; |
905 | } | |
906 | ||
907 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 908 | Manager *manager = userdata; |
e82e8fa5 TG |
909 | struct udev_device *dev; |
910 | int r; | |
911 | ||
c0c6806b | 912 | assert(manager); |
e82e8fa5 | 913 | |
c0c6806b | 914 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
915 | if (dev) { |
916 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 917 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
918 | if (r < 0) |
919 | udev_device_unref(dev); | |
8302fe5a TG |
920 | else |
921 | /* we have fresh events, try to schedule them */ | |
922 | event_queue_start(manager); | |
e82e8fa5 TG |
923 | } |
924 | ||
925 | return 1; | |
88f4b648 KS |
926 | } |
927 | ||
3b47c739 | 928 | /* receive the udevd message from userspace */ |
e82e8fa5 | 929 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 930 | Manager *manager = userdata; |
e4f66b77 TG |
931 | _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; |
932 | _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 KS |
933 | const char *str; |
934 | int i; | |
935 | ||
c0c6806b | 936 | assert(manager); |
e4f66b77 | 937 | |
c0c6806b | 938 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 939 | if (!ctrl_conn) |
e82e8fa5 | 940 | return 1; |
912541b0 KS |
941 | |
942 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 943 | if (!ctrl_msg) |
e82e8fa5 | 944 | return 1; |
912541b0 KS |
945 | |
946 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
947 | if (i >= 0) { | |
ed14edc0 | 948 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 949 | log_set_max_level(i); |
c0c6806b | 950 | manager_kill_workers(manager); |
912541b0 KS |
951 | } |
952 | ||
953 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 954 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 955 | manager->stop_exec_queue = true; |
912541b0 KS |
956 | } |
957 | ||
958 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 959 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 960 | manager->stop_exec_queue = false; |
8302fe5a | 961 | event_queue_start(manager); |
912541b0 KS |
962 | } |
963 | ||
964 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 965 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 966 | manager_reload(manager); |
912541b0 KS |
967 | } |
968 | ||
969 | str = udev_ctrl_get_set_env(ctrl_msg); | |
970 | if (str != NULL) { | |
c0c6806b | 971 | _cleanup_free_ char *key = NULL; |
912541b0 KS |
972 | |
973 | key = strdup(str); | |
c0c6806b | 974 | if (key) { |
912541b0 KS |
975 | char *val; |
976 | ||
977 | val = strchr(key, '='); | |
978 | if (val != NULL) { | |
979 | val[0] = '\0'; | |
980 | val = &val[1]; | |
981 | if (val[0] == '\0') { | |
9f6445e3 | 982 | log_debug("udevd message (ENV) received, unset '%s'", key); |
c0c6806b | 983 | udev_list_entry_add(&manager->properties, key, NULL); |
912541b0 | 984 | } else { |
9f6445e3 | 985 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); |
c0c6806b | 986 | udev_list_entry_add(&manager->properties, key, val); |
912541b0 | 987 | } |
c0c6806b | 988 | } else |
9f6445e3 | 989 | log_error("wrong key format '%s'", key); |
912541b0 | 990 | } |
c0c6806b | 991 | manager_kill_workers(manager); |
912541b0 KS |
992 | } |
993 | ||
994 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
995 | if (i >= 0) { | |
9f6445e3 | 996 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 997 | arg_children_max = i; |
912541b0 KS |
998 | } |
999 | ||
cb49a4f2 | 1000 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1001 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1002 | |
1003 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1004 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1005 | manager_exit(manager); |
c0c6806b TG |
1006 | /* keep reference to block the client until we exit |
1007 | TODO: deal with several blocking exit requests */ | |
1008 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1009 | } |
e4f66b77 | 1010 | |
e82e8fa5 | 1011 | return 1; |
88f4b648 | 1012 | } |
4a231017 | 1013 | |
f3a740a5 | 1014 | static int synthesize_change(struct udev_device *dev) { |
edd32000 | 1015 | char filename[UTIL_PATH_SIZE]; |
f3a740a5 | 1016 | int r; |
edd32000 | 1017 | |
f3a740a5 | 1018 | if (streq_ptr("block", udev_device_get_subsystem(dev)) && |
ede34445 | 1019 | streq_ptr("disk", udev_device_get_devtype(dev)) && |
638ca89c | 1020 | !startswith(udev_device_get_sysname(dev), "dm-")) { |
e9fc29f4 KS |
1021 | bool part_table_read = false; |
1022 | bool has_partitions = false; | |
ede34445 | 1023 | int fd; |
f3a740a5 KS |
1024 | struct udev *udev = udev_device_get_udev(dev); |
1025 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
1026 | struct udev_list_entry *item; | |
1027 | ||
ede34445 | 1028 | /* |
e9fc29f4 KS |
1029 | * Try to re-read the partition table. This only succeeds if |
1030 | * none of the devices is busy. The kernel returns 0 if no | |
1031 | * partition table is found, and we will not get an event for | |
1032 | * the disk. | |
ede34445 | 1033 | */ |
02ba8fb3 | 1034 | fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1035 | if (fd >= 0) { |
02ba8fb3 KS |
1036 | r = flock(fd, LOCK_EX|LOCK_NB); |
1037 | if (r >= 0) | |
1038 | r = ioctl(fd, BLKRRPART, 0); | |
1039 | ||
ede34445 KS |
1040 | close(fd); |
1041 | if (r >= 0) | |
e9fc29f4 | 1042 | part_table_read = true; |
ede34445 KS |
1043 | } |
1044 | ||
e9fc29f4 | 1045 | /* search for partitions */ |
f3a740a5 KS |
1046 | e = udev_enumerate_new(udev); |
1047 | if (!e) | |
1048 | return -ENOMEM; | |
1049 | ||
1050 | r = udev_enumerate_add_match_parent(e, dev); | |
1051 | if (r < 0) | |
1052 | return r; | |
1053 | ||
1054 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
1055 | if (r < 0) | |
1056 | return r; | |
1057 | ||
1058 | r = udev_enumerate_scan_devices(e); | |
47a3fa0f TA |
1059 | if (r < 0) |
1060 | return r; | |
e9fc29f4 KS |
1061 | |
1062 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1063 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1064 | ||
1065 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1066 | if (!d) | |
1067 | continue; | |
1068 | ||
1069 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1070 | continue; | |
1071 | ||
1072 | has_partitions = true; | |
1073 | break; | |
1074 | } | |
1075 | ||
1076 | /* | |
1077 | * We have partitions and re-read the table, the kernel already sent | |
1078 | * out a "change" event for the disk, and "remove/add" for all | |
1079 | * partitions. | |
1080 | */ | |
1081 | if (part_table_read && has_partitions) | |
1082 | return 0; | |
1083 | ||
1084 | /* | |
1085 | * We have partitions but re-reading the partition table did not | |
1086 | * work, synthesize "change" for the disk and all partitions. | |
1087 | */ | |
1088 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1089 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1090 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
e9fc29f4 | 1091 | |
f3a740a5 KS |
1092 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { |
1093 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1094 | ||
1095 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1096 | if (!d) | |
1097 | continue; | |
1098 | ||
1099 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1100 | continue; | |
1101 | ||
1102 | log_debug("device %s closed, synthesising partition '%s' 'change'", | |
1103 | udev_device_get_devnode(dev), udev_device_get_devnode(d)); | |
1104 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); | |
4c1fc3e4 | 1105 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
f3a740a5 | 1106 | } |
ede34445 KS |
1107 | |
1108 | return 0; | |
f3a740a5 KS |
1109 | } |
1110 | ||
ede34445 KS |
1111 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); |
1112 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1113 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
ede34445 | 1114 | |
f3a740a5 | 1115 | return 0; |
edd32000 KS |
1116 | } |
1117 | ||
e82e8fa5 | 1118 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1119 | Manager *manager = userdata; |
0254e944 | 1120 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1121 | struct inotify_event *e; |
1122 | ssize_t l; | |
912541b0 | 1123 | |
c0c6806b | 1124 | assert(manager); |
e82e8fa5 TG |
1125 | |
1126 | l = read(fd, &buffer, sizeof(buffer)); | |
f7c1ad4f LP |
1127 | if (l < 0) { |
1128 | if (errno == EAGAIN || errno == EINTR) | |
e82e8fa5 | 1129 | return 1; |
912541b0 | 1130 | |
f7c1ad4f | 1131 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1132 | } |
1133 | ||
f7c1ad4f | 1134 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
e82e8fa5 | 1135 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; |
912541b0 | 1136 | |
c0c6806b | 1137 | dev = udev_watch_lookup(manager->udev, e->wd); |
edd32000 KS |
1138 | if (!dev) |
1139 | continue; | |
912541b0 | 1140 | |
f7c1ad4f | 1141 | log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); |
a8389097 | 1142 | if (e->mask & IN_CLOSE_WRITE) { |
edd32000 | 1143 | synthesize_change(dev); |
a8389097 TG |
1144 | |
1145 | /* settle might be waiting on us to determine the queue | |
1146 | * state. If we just handled an inotify event, we might have | |
1147 | * generated a "change" event, but we won't have queued up | |
1148 | * the resultant uevent yet. Do that. | |
1149 | */ | |
c0c6806b | 1150 | on_uevent(NULL, -1, 0, manager); |
a8389097 | 1151 | } else if (e->mask & IN_IGNORED) |
c0c6806b | 1152 | udev_watch_end(manager->udev, dev); |
912541b0 KS |
1153 | } |
1154 | ||
e82e8fa5 | 1155 | return 1; |
bd284db1 SJR |
1156 | } |
1157 | ||
0561329d | 1158 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1159 | Manager *manager = userdata; |
1160 | ||
1161 | assert(manager); | |
1162 | ||
62d43dac | 1163 | manager_exit(manager); |
912541b0 | 1164 | |
e82e8fa5 TG |
1165 | return 1; |
1166 | } | |
912541b0 | 1167 | |
0561329d | 1168 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1169 | Manager *manager = userdata; |
1170 | ||
1171 | assert(manager); | |
1172 | ||
62d43dac | 1173 | manager_reload(manager); |
912541b0 | 1174 | |
e82e8fa5 TG |
1175 | return 1; |
1176 | } | |
912541b0 | 1177 | |
e82e8fa5 | 1178 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1179 | Manager *manager = userdata; |
1180 | ||
1181 | assert(manager); | |
1182 | ||
e82e8fa5 TG |
1183 | for (;;) { |
1184 | pid_t pid; | |
1185 | int status; | |
1186 | struct worker *worker; | |
d1317d02 | 1187 | |
e82e8fa5 TG |
1188 | pid = waitpid(-1, &status, WNOHANG); |
1189 | if (pid <= 0) | |
f29328d6 | 1190 | break; |
e82e8fa5 | 1191 | |
c0c6806b | 1192 | worker = hashmap_get(manager->workers, UINT_TO_PTR(pid)); |
e82e8fa5 TG |
1193 | if (!worker) { |
1194 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1195 | continue; |
912541b0 | 1196 | } |
e82e8fa5 TG |
1197 | |
1198 | if (WIFEXITED(status)) { | |
1199 | if (WEXITSTATUS(status) == 0) | |
1200 | log_debug("worker ["PID_FMT"] exited", pid); | |
1201 | else | |
1202 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1203 | } else if (WIFSIGNALED(status)) { | |
1204 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); | |
1205 | } else if (WIFSTOPPED(status)) { | |
1206 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1207 | continue; |
e82e8fa5 TG |
1208 | } else if (WIFCONTINUED(status)) { |
1209 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1210 | continue; |
e82e8fa5 TG |
1211 | } else |
1212 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1213 | ||
1214 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1215 | if (worker->event) { | |
1216 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1217 | /* delete state from disk */ | |
1218 | udev_device_delete_db(worker->event->dev); | |
1219 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1220 | /* forward kernel event without amending it */ | |
c0c6806b | 1221 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); |
e82e8fa5 TG |
1222 | } |
1223 | } | |
1224 | ||
1225 | worker_free(worker); | |
912541b0 | 1226 | } |
e82e8fa5 | 1227 | |
8302fe5a TG |
1228 | /* we can start new workers, try to schedule events */ |
1229 | event_queue_start(manager); | |
1230 | ||
e82e8fa5 | 1231 | return 1; |
f27125f9 | 1232 | } |
1233 | ||
693d371d TG |
1234 | static int on_post(sd_event_source *s, void *userdata) { |
1235 | Manager *manager = userdata; | |
1236 | int r; | |
1237 | ||
1238 | assert(manager); | |
1239 | ||
1240 | if (udev_list_node_is_empty(&manager->events)) { | |
1241 | /* no pending events */ | |
1242 | if (!hashmap_isempty(manager->workers)) { | |
1243 | /* there are idle workers */ | |
1244 | log_debug("cleanup idle workers"); | |
1245 | manager_kill_workers(manager); | |
1246 | } else { | |
1247 | /* we are idle */ | |
1248 | if (manager->exit) { | |
1249 | r = sd_event_exit(manager->event, 0); | |
1250 | if (r < 0) | |
1251 | return r; | |
1252 | } else if (manager->cgroup) | |
1253 | /* cleanup possible left-over processes in our cgroup */ | |
1254 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, false, true, NULL); | |
1255 | } | |
1256 | } | |
1257 | ||
1258 | return 1; | |
1259 | } | |
1260 | ||
fcff1e72 | 1261 | static int listen_fds(int *rctrl, int *rnetlink) { |
f59118ec | 1262 | _cleanup_udev_unref_ struct udev *udev = NULL; |
fcff1e72 | 1263 | int ctrl_fd = -1, netlink_fd = -1; |
f59118ec | 1264 | int fd, n, r; |
912541b0 | 1265 | |
fcff1e72 TG |
1266 | assert(rctrl); |
1267 | assert(rnetlink); | |
1268 | ||
912541b0 | 1269 | n = sd_listen_fds(true); |
fcff1e72 TG |
1270 | if (n < 0) |
1271 | return n; | |
912541b0 KS |
1272 | |
1273 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1274 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1275 | if (ctrl_fd >= 0) |
1276 | return -EINVAL; | |
1277 | ctrl_fd = fd; | |
912541b0 KS |
1278 | continue; |
1279 | } | |
1280 | ||
1281 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1282 | if (netlink_fd >= 0) |
1283 | return -EINVAL; | |
1284 | netlink_fd = fd; | |
912541b0 KS |
1285 | continue; |
1286 | } | |
1287 | ||
fcff1e72 | 1288 | return -EINVAL; |
912541b0 KS |
1289 | } |
1290 | ||
f59118ec TG |
1291 | if (ctrl_fd < 0) { |
1292 | _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL; | |
1293 | ||
1294 | udev = udev_new(); | |
1295 | if (!udev) | |
1296 | return -ENOMEM; | |
1297 | ||
1298 | ctrl = udev_ctrl_new(udev); | |
1299 | if (!ctrl) | |
1300 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1301 | ||
1302 | r = udev_ctrl_enable_receiving(ctrl); | |
1303 | if (r < 0) | |
1304 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1305 | ||
1306 | fd = udev_ctrl_get_fd(ctrl); | |
1307 | if (fd < 0) | |
1308 | return log_error_errno(EIO, "could not get ctrl fd"); | |
fcff1e72 | 1309 | |
f59118ec TG |
1310 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
1311 | if (ctrl_fd < 0) | |
1312 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1313 | } | |
1314 | ||
1315 | if (netlink_fd < 0) { | |
1316 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
1317 | ||
1318 | if (!udev) { | |
1319 | udev = udev_new(); | |
1320 | if (!udev) | |
1321 | return -ENOMEM; | |
1322 | } | |
1323 | ||
1324 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1325 | if (!monitor) | |
1326 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1327 | ||
1328 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1329 | ||
1330 | r = udev_monitor_enable_receiving(monitor); | |
1331 | if (r < 0) | |
1332 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1333 | ||
1334 | fd = udev_monitor_get_fd(monitor); | |
1335 | if (fd < 0) | |
1336 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1337 | ||
1338 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
1339 | if (ctrl_fd < 0) | |
1340 | return log_error_errno(errno, "could not dup netlink fd: %m"); | |
1341 | } | |
fcff1e72 TG |
1342 | |
1343 | *rctrl = ctrl_fd; | |
1344 | *rnetlink = netlink_fd; | |
912541b0 | 1345 | |
912541b0 | 1346 | return 0; |
7459bcdc KS |
1347 | } |
1348 | ||
e6f86cac | 1349 | /* |
3f85ef0f | 1350 | * read the kernel command line, in case we need to get into debug mode |
614a823c TG |
1351 | * udev.log-priority=<level> syslog priority |
1352 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1353 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1354 | * udev.event-timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1355 | */ |
614a823c | 1356 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
3567afa5 | 1357 | const char *full_key = key; |
74df0fca | 1358 | int r; |
e6f86cac | 1359 | |
614a823c | 1360 | assert(key); |
e6f86cac | 1361 | |
614a823c TG |
1362 | if (!value) |
1363 | return 0; | |
e6f86cac | 1364 | |
614a823c TG |
1365 | if (startswith(key, "rd.")) |
1366 | key += strlen("rd."); | |
e6f86cac | 1367 | |
614a823c TG |
1368 | if (startswith(key, "udev.")) |
1369 | key += strlen("udev."); | |
1370 | else | |
1371 | return 0; | |
e6f86cac | 1372 | |
614a823c TG |
1373 | if (streq(key, "log-priority")) { |
1374 | int prio; | |
e6f86cac | 1375 | |
614a823c | 1376 | prio = util_log_priority(value); |
e00f5bdd | 1377 | if (prio < 0) |
3567afa5 MS |
1378 | goto invalid; |
1379 | log_set_max_level(prio); | |
614a823c | 1380 | } else if (streq(key, "children-max")) { |
020328e1 | 1381 | r = safe_atou(value, &arg_children_max); |
614a823c | 1382 | if (r < 0) |
3567afa5 | 1383 | goto invalid; |
614a823c TG |
1384 | } else if (streq(key, "exec-delay")) { |
1385 | r = safe_atoi(value, &arg_exec_delay); | |
1386 | if (r < 0) | |
3567afa5 | 1387 | goto invalid; |
614a823c TG |
1388 | } else if (streq(key, "event-timeout")) { |
1389 | r = safe_atou64(value, &arg_event_timeout_usec); | |
1390 | if (r < 0) | |
3567afa5 MS |
1391 | goto invalid; |
1392 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1393 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
e6f86cac | 1394 | } |
614a823c | 1395 | |
3567afa5 MS |
1396 | return 0; |
1397 | invalid: | |
1398 | log_warning("invalid %s ignored: %s", full_key, value); | |
614a823c | 1399 | return 0; |
e6f86cac KS |
1400 | } |
1401 | ||
ed216e1f TG |
1402 | static void help(void) { |
1403 | printf("%s [OPTIONS...]\n\n" | |
1404 | "Manages devices.\n\n" | |
5ac0162c LP |
1405 | " -h --help Print this message\n" |
1406 | " --version Print version of the program\n" | |
1407 | " --daemon Detach and run in the background\n" | |
1408 | " --debug Enable debug output\n" | |
1409 | " --children-max=INT Set maximum number of workers\n" | |
1410 | " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1411 | " --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1412 | " --resolve-names=early|late|never\n" | |
1413 | " When to resolve users and groups\n" | |
ed216e1f TG |
1414 | , program_invocation_short_name); |
1415 | } | |
1416 | ||
bba7a484 | 1417 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1418 | static const struct option options[] = { |
bba7a484 TG |
1419 | { "daemon", no_argument, NULL, 'd' }, |
1420 | { "debug", no_argument, NULL, 'D' }, | |
1421 | { "children-max", required_argument, NULL, 'c' }, | |
1422 | { "exec-delay", required_argument, NULL, 'e' }, | |
1423 | { "event-timeout", required_argument, NULL, 't' }, | |
1424 | { "resolve-names", required_argument, NULL, 'N' }, | |
1425 | { "help", no_argument, NULL, 'h' }, | |
1426 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1427 | {} |
1428 | }; | |
689a97f5 | 1429 | |
bba7a484 | 1430 | int c; |
689a97f5 | 1431 | |
bba7a484 TG |
1432 | assert(argc >= 0); |
1433 | assert(argv); | |
912541b0 | 1434 | |
e14b6f21 | 1435 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
f1e8664e | 1436 | int r; |
912541b0 | 1437 | |
bba7a484 | 1438 | switch (c) { |
912541b0 | 1439 | |
912541b0 | 1440 | case 'd': |
bba7a484 | 1441 | arg_daemonize = true; |
912541b0 KS |
1442 | break; |
1443 | case 'c': | |
020328e1 | 1444 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1445 | if (r < 0) |
1446 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1447 | break; |
1448 | case 'e': | |
6f5cf8a8 TG |
1449 | r = safe_atoi(optarg, &arg_exec_delay); |
1450 | if (r < 0) | |
1451 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1452 | break; |
9719859c | 1453 | case 't': |
f1e8664e TG |
1454 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1455 | if (r < 0) | |
65fea570 | 1456 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1457 | else { |
1458 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1459 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1460 | } | |
9719859c | 1461 | break; |
912541b0 | 1462 | case 'D': |
bba7a484 | 1463 | arg_debug = true; |
912541b0 KS |
1464 | break; |
1465 | case 'N': | |
090be865 | 1466 | if (streq(optarg, "early")) { |
bba7a484 | 1467 | arg_resolve_names = 1; |
090be865 | 1468 | } else if (streq(optarg, "late")) { |
bba7a484 | 1469 | arg_resolve_names = 0; |
090be865 | 1470 | } else if (streq(optarg, "never")) { |
bba7a484 | 1471 | arg_resolve_names = -1; |
912541b0 | 1472 | } else { |
9f6445e3 | 1473 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1474 | return 0; |
912541b0 KS |
1475 | } |
1476 | break; | |
1477 | case 'h': | |
ed216e1f | 1478 | help(); |
bba7a484 | 1479 | return 0; |
912541b0 KS |
1480 | case 'V': |
1481 | printf("%s\n", VERSION); | |
bba7a484 TG |
1482 | return 0; |
1483 | case '?': | |
1484 | return -EINVAL; | |
912541b0 | 1485 | default: |
bba7a484 TG |
1486 | assert_not_reached("Unhandled option"); |
1487 | ||
912541b0 KS |
1488 | } |
1489 | } | |
1490 | ||
bba7a484 TG |
1491 | return 1; |
1492 | } | |
1493 | ||
b7f74dd4 | 1494 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1495 | _cleanup_(manager_freep) Manager *manager = NULL; |
11b1dd8c | 1496 | int r, fd_worker, one = 1; |
c0c6806b TG |
1497 | |
1498 | assert(ret); | |
11b1dd8c TG |
1499 | assert(fd_ctrl >= 0); |
1500 | assert(fd_uevent >= 0); | |
c0c6806b TG |
1501 | |
1502 | manager = new0(Manager, 1); | |
1503 | if (!manager) | |
1504 | return log_oom(); | |
1505 | ||
e237d8cb TG |
1506 | manager->fd_inotify = -1; |
1507 | manager->worker_watch[WRITE_END] = -1; | |
1508 | manager->worker_watch[READ_END] = -1; | |
1509 | ||
c0c6806b TG |
1510 | manager->udev = udev_new(); |
1511 | if (!manager->udev) | |
1512 | return log_error_errno(errno, "could not allocate udev context: %m"); | |
1513 | ||
b2d21d93 TG |
1514 | udev_builtin_init(manager->udev); |
1515 | ||
ecb17862 TG |
1516 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); |
1517 | if (!manager->rules) | |
1518 | return log_error_errno(ENOMEM, "error reading rules"); | |
1519 | ||
1520 | udev_list_node_init(&manager->events); | |
1521 | udev_list_init(manager->udev, &manager->properties, true); | |
1522 | ||
c26d1879 TG |
1523 | manager->cgroup = cgroup; |
1524 | ||
f59118ec TG |
1525 | manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); |
1526 | if (!manager->ctrl) | |
1527 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e237d8cb | 1528 | |
f59118ec TG |
1529 | manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); |
1530 | if (!manager->monitor) | |
1531 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1532 | |
1533 | /* unnamed socket from workers to the main daemon */ | |
1534 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1535 | if (r < 0) | |
1536 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1537 | ||
693d371d | 1538 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1539 | |
693d371d | 1540 | r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
e237d8cb TG |
1541 | if (r < 0) |
1542 | return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); | |
1543 | ||
1544 | manager->fd_inotify = udev_watch_init(manager->udev); | |
1545 | if (manager->fd_inotify < 0) | |
1546 | return log_error_errno(ENOMEM, "error initializing inotify"); | |
1547 | ||
1548 | udev_watch_restore(manager->udev); | |
1549 | ||
1550 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1551 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1552 | |
49f997f3 TG |
1553 | r = sd_event_default(&manager->event); |
1554 | if (r < 0) | |
1555 | return log_error_errno(errno, "could not allocate event loop: %m"); | |
1556 | ||
693d371d TG |
1557 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1558 | if (r < 0) | |
1559 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1560 | ||
1561 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1562 | if (r < 0) | |
1563 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1564 | ||
1565 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1566 | if (r < 0) | |
1567 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1568 | ||
1569 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1570 | if (r < 0) | |
1571 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1572 | ||
1573 | r = sd_event_set_watchdog(manager->event, true); | |
1574 | if (r < 0) | |
1575 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1576 | ||
11b1dd8c | 1577 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1578 | if (r < 0) |
1579 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1580 | ||
1581 | /* This needs to be after the inotify and uevent handling, to make sure | |
1582 | * that the ping is send back after fully processing the pending uevents | |
1583 | * (including the synthetic ones we may create due to inotify events). | |
1584 | */ | |
1585 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1586 | if (r < 0) | |
1587 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1588 | ||
1589 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1590 | if (r < 0) | |
1591 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1592 | ||
11b1dd8c | 1593 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); |
693d371d TG |
1594 | if (r < 0) |
1595 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1596 | ||
1597 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1598 | if (r < 0) | |
1599 | return log_error_errno(r, "error creating worker event source: %m"); | |
1600 | ||
1601 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1602 | if (r < 0) | |
1603 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1604 | |
11b1dd8c TG |
1605 | *ret = manager; |
1606 | manager = NULL; | |
1607 | ||
86c3bece | 1608 | return 0; |
c0c6806b TG |
1609 | } |
1610 | ||
077fc5e2 | 1611 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1612 | _cleanup_(manager_freep) Manager *manager = NULL; |
077fc5e2 DH |
1613 | int r; |
1614 | ||
1615 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1616 | if (r < 0) { | |
1617 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1618 | goto exit; | |
1619 | } | |
1620 | ||
1621 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1622 | if (r < 0) | |
1623 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1624 | ||
1625 | (void) sd_notify(false, | |
1626 | "READY=1\n" | |
1627 | "STATUS=Processing..."); | |
1628 | ||
1629 | r = sd_event_loop(manager->event); | |
1630 | if (r < 0) { | |
1631 | log_error_errno(r, "event loop failed: %m"); | |
1632 | goto exit; | |
1633 | } | |
1634 | ||
1635 | sd_event_get_exit_code(manager->event, &r); | |
1636 | ||
1637 | exit: | |
1638 | sd_notify(false, | |
1639 | "STOPPING=1\n" | |
1640 | "STATUS=Shutting down..."); | |
1641 | if (manager) | |
1642 | udev_ctrl_cleanup(manager->ctrl); | |
1643 | return r; | |
1644 | } | |
1645 | ||
1646 | int main(int argc, char *argv[]) { | |
c26d1879 | 1647 | _cleanup_free_ char *cgroup = NULL; |
b7f74dd4 | 1648 | int r, fd_ctrl, fd_uevent; |
bba7a484 | 1649 | |
bba7a484 TG |
1650 | log_set_target(LOG_TARGET_AUTO); |
1651 | log_parse_environment(); | |
1652 | log_open(); | |
1653 | ||
bba7a484 TG |
1654 | r = parse_argv(argc, argv); |
1655 | if (r <= 0) | |
1656 | goto exit; | |
1657 | ||
614a823c TG |
1658 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
1659 | if (r < 0) | |
1660 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1661 | |
78d3e041 KS |
1662 | if (arg_debug) { |
1663 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1664 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1665 | } |
bba7a484 | 1666 | |
912541b0 | 1667 | if (getuid() != 0) { |
6af5e6a4 | 1668 | r = log_error_errno(EPERM, "root privileges required"); |
912541b0 KS |
1669 | goto exit; |
1670 | } | |
1671 | ||
712cebf1 TG |
1672 | if (arg_children_max == 0) { |
1673 | cpu_set_t cpu_set; | |
ebc164ef | 1674 | |
712cebf1 | 1675 | arg_children_max = 8; |
d457ff83 | 1676 | |
ece174c5 | 1677 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
920b52e4 | 1678 | arg_children_max += CPU_COUNT(&cpu_set) * 2; |
912541b0 | 1679 | |
712cebf1 | 1680 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1681 | } |
912541b0 | 1682 | |
712cebf1 TG |
1683 | /* set umask before creating any file/directory */ |
1684 | r = chdir("/"); | |
1685 | if (r < 0) { | |
1686 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1687 | goto exit; | |
1688 | } | |
194bbe33 | 1689 | |
712cebf1 | 1690 | umask(022); |
912541b0 | 1691 | |
712cebf1 TG |
1692 | r = mac_selinux_init("/dev"); |
1693 | if (r < 0) { | |
1694 | log_error_errno(r, "could not initialize labelling: %m"); | |
1695 | goto exit; | |
912541b0 KS |
1696 | } |
1697 | ||
712cebf1 TG |
1698 | r = mkdir("/run/udev", 0755); |
1699 | if (r < 0 && errno != EEXIST) { | |
1700 | r = log_error_errno(errno, "could not create /run/udev: %m"); | |
1701 | goto exit; | |
1702 | } | |
1703 | ||
03cfe0d5 | 1704 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1705 | |
c26d1879 TG |
1706 | if (getppid() == 1) { |
1707 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1708 | we only do this on systemd systems, and only if we are directly spawned | |
1709 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1710 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
11b9fb15 | 1711 | if (r < 0) { |
e859aa9e | 1712 | if (r == -ENOENT || r == -ENOEXEC) |
11b9fb15 TG |
1713 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1714 | else | |
1715 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1716 | } | |
c26d1879 TG |
1717 | } |
1718 | ||
b7f74dd4 TG |
1719 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1720 | if (r < 0) { | |
1721 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1722 | goto exit; | |
1723 | } | |
1724 | ||
bba7a484 | 1725 | if (arg_daemonize) { |
912541b0 | 1726 | pid_t pid; |
912541b0 | 1727 | |
3cbb2057 TG |
1728 | log_info("starting version " VERSION); |
1729 | ||
40e749b5 TG |
1730 | /* connect /dev/null to stdin, stdout, stderr */ |
1731 | if (log_get_max_level() < LOG_DEBUG) | |
1732 | (void) make_null_stdio(); | |
1733 | ||
912541b0 KS |
1734 | pid = fork(); |
1735 | switch (pid) { | |
1736 | case 0: | |
1737 | break; | |
1738 | case -1: | |
6af5e6a4 | 1739 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1740 | goto exit; |
1741 | default: | |
f53d1fcd TG |
1742 | mac_selinux_finish(); |
1743 | log_close(); | |
1744 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1745 | } |
1746 | ||
1747 | setsid(); | |
1748 | ||
ad118bda | 1749 | write_string_file("/proc/self/oom_score_adj", "-1000", 0); |
7500cd5e | 1750 | } |
912541b0 | 1751 | |
077fc5e2 | 1752 | r = run(fd_ctrl, fd_uevent, cgroup); |
693d371d | 1753 | |
53921bfa | 1754 | exit: |
cc56fafe | 1755 | mac_selinux_finish(); |
baa30fbc | 1756 | log_close(); |
6af5e6a4 | 1757 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1758 | } |