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3f65d731 ZJS |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
7fafc032 | 3 | /* |
1298001e | 4 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> |
2f6cbd19 | 5 | * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> |
bb38678e SJR |
6 | * Copyright (C) 2009 Canonical Ltd. |
7 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
7fafc032 | 8 | * |
55e9959b KS |
9 | * This program is free software: you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation, either version 2 of the License, or | |
12 | * (at your option) any later version. | |
7fafc032 | 13 | * |
55e9959b KS |
14 | * This program is distributed in the hope that it will be useful, |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
7fafc032 | 18 | * |
55e9959b KS |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
7fafc032 KS |
21 | */ |
22 | ||
7fafc032 | 23 | #include <errno.h> |
618234a5 LP |
24 | #include <fcntl.h> |
25 | #include <getopt.h> | |
26 | #include <signal.h> | |
27 | #include <stdbool.h> | |
28 | #include <stddef.h> | |
7fafc032 KS |
29 | #include <stdio.h> |
30 | #include <stdlib.h> | |
31 | #include <string.h> | |
618234a5 | 32 | #include <sys/epoll.h> |
3ebdb81e | 33 | #include <sys/file.h> |
618234a5 LP |
34 | #include <sys/inotify.h> |
35 | #include <sys/ioctl.h> | |
36 | #include <sys/mount.h> | |
1e03b754 | 37 | #include <sys/prctl.h> |
1e03b754 | 38 | #include <sys/signalfd.h> |
618234a5 | 39 | #include <sys/socket.h> |
dc117daa | 40 | #include <sys/stat.h> |
618234a5 LP |
41 | #include <sys/time.h> |
42 | #include <sys/wait.h> | |
43 | #include <unistd.h> | |
7fafc032 | 44 | |
392ef7a2 | 45 | #include "sd-daemon.h" |
693d371d | 46 | #include "sd-event.h" |
8314de1d | 47 | |
b5efdb8a | 48 | #include "alloc-util.h" |
194bbe33 | 49 | #include "cgroup-util.h" |
618234a5 | 50 | #include "cpu-set-util.h" |
5ba2dc25 | 51 | #include "dev-setup.h" |
3ffd4af2 | 52 | #include "fd-util.h" |
a5c32cff | 53 | #include "fileio.h" |
6482f626 | 54 | #include "formats-util.h" |
f4f15635 | 55 | #include "fs-util.h" |
a505965d | 56 | #include "hashmap.h" |
c004493c | 57 | #include "io-util.h" |
618234a5 | 58 | #include "netlink-util.h" |
6bedfcbb | 59 | #include "parse-util.h" |
4e731273 | 60 | #include "proc-cmdline.h" |
618234a5 LP |
61 | #include "process-util.h" |
62 | #include "selinux-util.h" | |
63 | #include "signal-util.h" | |
8f328d36 | 64 | #include "socket-util.h" |
07630cea | 65 | #include "string-util.h" |
618234a5 LP |
66 | #include "terminal-util.h" |
67 | #include "udev-util.h" | |
68 | #include "udev.h" | |
ee104e11 | 69 | #include "user-util.h" |
7fafc032 | 70 | |
bba7a484 TG |
71 | static bool arg_debug = false; |
72 | static int arg_daemonize = false; | |
73 | static int arg_resolve_names = 1; | |
020328e1 | 74 | static unsigned arg_children_max; |
bba7a484 TG |
75 | static int arg_exec_delay; |
76 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
77 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
c0c6806b TG |
78 | |
79 | typedef struct Manager { | |
80 | struct udev *udev; | |
693d371d | 81 | sd_event *event; |
c0c6806b | 82 | Hashmap *workers; |
ecb17862 | 83 | struct udev_list_node events; |
c26d1879 | 84 | const char *cgroup; |
cb49a4f2 | 85 | pid_t pid; /* the process that originally allocated the manager object */ |
c0c6806b | 86 | |
ecb17862 | 87 | struct udev_rules *rules; |
c0c6806b TG |
88 | struct udev_list properties; |
89 | ||
90 | struct udev_monitor *monitor; | |
91 | struct udev_ctrl *ctrl; | |
92 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e237d8cb | 93 | int fd_inotify; |
e237d8cb TG |
94 | int worker_watch[2]; |
95 | ||
693d371d TG |
96 | sd_event_source *ctrl_event; |
97 | sd_event_source *uevent_event; | |
98 | sd_event_source *inotify_event; | |
99 | ||
7c4c7e89 TG |
100 | usec_t last_usec; |
101 | ||
c0c6806b | 102 | bool stop_exec_queue:1; |
c0c6806b TG |
103 | bool exit:1; |
104 | } Manager; | |
1e03b754 | 105 | |
1e03b754 | 106 | enum event_state { |
912541b0 KS |
107 | EVENT_UNDEF, |
108 | EVENT_QUEUED, | |
109 | EVENT_RUNNING, | |
1e03b754 KS |
110 | }; |
111 | ||
112 | struct event { | |
912541b0 | 113 | struct udev_list_node node; |
cb49a4f2 | 114 | Manager *manager; |
912541b0 KS |
115 | struct udev *udev; |
116 | struct udev_device *dev; | |
6969c349 | 117 | struct udev_device *dev_kernel; |
c6aa11f2 | 118 | struct worker *worker; |
912541b0 | 119 | enum event_state state; |
912541b0 KS |
120 | unsigned long long int delaying_seqnum; |
121 | unsigned long long int seqnum; | |
122 | const char *devpath; | |
123 | size_t devpath_len; | |
124 | const char *devpath_old; | |
125 | dev_t devnum; | |
912541b0 | 126 | int ifindex; |
ea6039a3 | 127 | bool is_block; |
693d371d TG |
128 | sd_event_source *timeout_warning; |
129 | sd_event_source *timeout; | |
1e03b754 KS |
130 | }; |
131 | ||
9ec6e95b | 132 | static inline struct event *node_to_event(struct udev_list_node *node) { |
b27ee00b | 133 | return container_of(node, struct event, node); |
1e03b754 KS |
134 | } |
135 | ||
ecb17862 | 136 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
ff2c503d | 137 | |
1e03b754 | 138 | enum worker_state { |
912541b0 KS |
139 | WORKER_UNDEF, |
140 | WORKER_RUNNING, | |
141 | WORKER_IDLE, | |
142 | WORKER_KILLED, | |
1e03b754 KS |
143 | }; |
144 | ||
145 | struct worker { | |
c0c6806b | 146 | Manager *manager; |
912541b0 | 147 | struct udev_list_node node; |
912541b0 KS |
148 | int refcount; |
149 | pid_t pid; | |
150 | struct udev_monitor *monitor; | |
151 | enum worker_state state; | |
152 | struct event *event; | |
1e03b754 KS |
153 | }; |
154 | ||
155 | /* passed from worker to main process */ | |
156 | struct worker_message { | |
1e03b754 KS |
157 | }; |
158 | ||
c6aa11f2 | 159 | static void event_free(struct event *event) { |
cb49a4f2 TG |
160 | int r; |
161 | ||
c6aa11f2 TG |
162 | if (!event) |
163 | return; | |
164 | ||
912541b0 | 165 | udev_list_node_remove(&event->node); |
912541b0 | 166 | udev_device_unref(event->dev); |
6969c349 | 167 | udev_device_unref(event->dev_kernel); |
c6aa11f2 | 168 | |
693d371d TG |
169 | sd_event_source_unref(event->timeout_warning); |
170 | sd_event_source_unref(event->timeout); | |
171 | ||
c6aa11f2 TG |
172 | if (event->worker) |
173 | event->worker->event = NULL; | |
174 | ||
cb49a4f2 TG |
175 | assert(event->manager); |
176 | ||
177 | if (udev_list_node_is_empty(&event->manager->events)) { | |
178 | /* only clean up the queue from the process that created it */ | |
179 | if (event->manager->pid == getpid()) { | |
180 | r = unlink("/run/udev/queue"); | |
181 | if (r < 0) | |
182 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
183 | } | |
184 | } | |
185 | ||
912541b0 | 186 | free(event); |
aa8734ff | 187 | } |
7a770250 | 188 | |
c6aa11f2 TG |
189 | static void worker_free(struct worker *worker) { |
190 | if (!worker) | |
191 | return; | |
bc113de9 | 192 | |
c0c6806b TG |
193 | assert(worker->manager); |
194 | ||
4a0b58c4 | 195 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); |
912541b0 | 196 | udev_monitor_unref(worker->monitor); |
c6aa11f2 TG |
197 | event_free(worker->event); |
198 | ||
c6aa11f2 | 199 | free(worker); |
ff2c503d KS |
200 | } |
201 | ||
c0c6806b | 202 | static void manager_workers_free(Manager *manager) { |
a505965d TG |
203 | struct worker *worker; |
204 | Iterator i; | |
ff2c503d | 205 | |
c0c6806b TG |
206 | assert(manager); |
207 | ||
208 | HASHMAP_FOREACH(worker, manager->workers, i) | |
c6aa11f2 | 209 | worker_free(worker); |
a505965d | 210 | |
c0c6806b | 211 | manager->workers = hashmap_free(manager->workers); |
fc465079 KS |
212 | } |
213 | ||
c0c6806b | 214 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { |
a505965d TG |
215 | _cleanup_free_ struct worker *worker = NULL; |
216 | int r; | |
3a19b32a TG |
217 | |
218 | assert(ret); | |
c0c6806b | 219 | assert(manager); |
3a19b32a TG |
220 | assert(worker_monitor); |
221 | assert(pid > 1); | |
222 | ||
223 | worker = new0(struct worker, 1); | |
224 | if (!worker) | |
225 | return -ENOMEM; | |
226 | ||
39c19cf1 | 227 | worker->refcount = 1; |
c0c6806b | 228 | worker->manager = manager; |
3a19b32a TG |
229 | /* close monitor, but keep address around */ |
230 | udev_monitor_disconnect(worker_monitor); | |
231 | worker->monitor = udev_monitor_ref(worker_monitor); | |
232 | worker->pid = pid; | |
a505965d | 233 | |
c0c6806b | 234 | r = hashmap_ensure_allocated(&manager->workers, NULL); |
a505965d TG |
235 | if (r < 0) |
236 | return r; | |
237 | ||
4a0b58c4 | 238 | r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker); |
a505965d TG |
239 | if (r < 0) |
240 | return r; | |
241 | ||
3a19b32a | 242 | *ret = worker; |
a505965d | 243 | worker = NULL; |
3a19b32a TG |
244 | |
245 | return 0; | |
246 | } | |
247 | ||
4fa4d885 TG |
248 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
249 | struct event *event = userdata; | |
250 | ||
251 | assert(event); | |
252 | assert(event->worker); | |
253 | ||
254 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
255 | event->worker->state = WORKER_KILLED; | |
256 | ||
257 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
258 | ||
259 | return 1; | |
260 | } | |
261 | ||
262 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
263 | struct event *event = userdata; | |
264 | ||
265 | assert(event); | |
266 | ||
267 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
268 | ||
269 | return 1; | |
270 | } | |
271 | ||
39c19cf1 | 272 | static void worker_attach_event(struct worker *worker, struct event *event) { |
693d371d TG |
273 | sd_event *e; |
274 | uint64_t usec; | |
693d371d | 275 | |
c6aa11f2 | 276 | assert(worker); |
693d371d | 277 | assert(worker->manager); |
c6aa11f2 TG |
278 | assert(event); |
279 | assert(!event->worker); | |
280 | assert(!worker->event); | |
281 | ||
39c19cf1 | 282 | worker->state = WORKER_RUNNING; |
39c19cf1 TG |
283 | worker->event = event; |
284 | event->state = EVENT_RUNNING; | |
c6aa11f2 | 285 | event->worker = worker; |
693d371d TG |
286 | |
287 | e = worker->manager->event; | |
288 | ||
38a03f06 | 289 | assert_se(sd_event_now(e, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
290 | |
291 | (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), | |
292 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); | |
293 | ||
294 | (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), | |
295 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); | |
39c19cf1 TG |
296 | } |
297 | ||
e237d8cb TG |
298 | static void manager_free(Manager *manager) { |
299 | if (!manager) | |
300 | return; | |
301 | ||
b2d21d93 TG |
302 | udev_builtin_exit(manager->udev); |
303 | ||
693d371d TG |
304 | sd_event_source_unref(manager->ctrl_event); |
305 | sd_event_source_unref(manager->uevent_event); | |
306 | sd_event_source_unref(manager->inotify_event); | |
307 | ||
e237d8cb | 308 | udev_unref(manager->udev); |
693d371d | 309 | sd_event_unref(manager->event); |
e237d8cb TG |
310 | manager_workers_free(manager); |
311 | event_queue_cleanup(manager, EVENT_UNDEF); | |
312 | ||
313 | udev_monitor_unref(manager->monitor); | |
314 | udev_ctrl_unref(manager->ctrl); | |
315 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
316 | ||
317 | udev_list_cleanup(&manager->properties); | |
318 | udev_rules_unref(manager->rules); | |
e237d8cb | 319 | |
e237d8cb TG |
320 | safe_close(manager->fd_inotify); |
321 | safe_close_pair(manager->worker_watch); | |
322 | ||
323 | free(manager); | |
324 | } | |
325 | ||
326 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); | |
327 | ||
9a73bd7c TG |
328 | static int worker_send_message(int fd) { |
329 | struct worker_message message = {}; | |
330 | ||
331 | return loop_write(fd, &message, sizeof(message), false); | |
332 | } | |
333 | ||
c0c6806b | 334 | static void worker_spawn(Manager *manager, struct event *event) { |
912541b0 | 335 | struct udev *udev = event->udev; |
3a19b32a | 336 | _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; |
912541b0 | 337 | pid_t pid; |
b6aab8ef | 338 | int r = 0; |
912541b0 KS |
339 | |
340 | /* listen for new events */ | |
341 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
342 | if (worker_monitor == NULL) | |
343 | return; | |
344 | /* allow the main daemon netlink address to send devices to the worker */ | |
c0c6806b | 345 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
b6aab8ef TG |
346 | r = udev_monitor_enable_receiving(worker_monitor); |
347 | if (r < 0) | |
348 | log_error_errno(r, "worker: could not enable receiving of device: %m"); | |
912541b0 | 349 | |
912541b0 KS |
350 | pid = fork(); |
351 | switch (pid) { | |
352 | case 0: { | |
353 | struct udev_device *dev = NULL; | |
4afd3348 | 354 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
912541b0 | 355 | int fd_monitor; |
e237d8cb | 356 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
2dd9f98d TG |
357 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
358 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
912541b0 | 359 | sigset_t mask; |
912541b0 | 360 | |
43095991 | 361 | /* take initial device from queue */ |
912541b0 KS |
362 | dev = event->dev; |
363 | event->dev = NULL; | |
364 | ||
39fd2ca1 TG |
365 | unsetenv("NOTIFY_SOCKET"); |
366 | ||
c0c6806b | 367 | manager_workers_free(manager); |
ecb17862 | 368 | event_queue_cleanup(manager, EVENT_UNDEF); |
6d1b1e0b | 369 | |
e237d8cb | 370 | manager->monitor = udev_monitor_unref(manager->monitor); |
6d1b1e0b | 371 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 372 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
693d371d | 373 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e237d8cb | 374 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
912541b0 | 375 | |
693d371d TG |
376 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
377 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
378 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
379 | ||
380 | manager->event = sd_event_unref(manager->event); | |
381 | ||
912541b0 KS |
382 | sigfillset(&mask); |
383 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
384 | if (fd_signal < 0) { | |
6af5e6a4 | 385 | r = log_error_errno(errno, "error creating signalfd %m"); |
912541b0 KS |
386 | goto out; |
387 | } | |
2dd9f98d TG |
388 | ep_signal.data.fd = fd_signal; |
389 | ||
390 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
391 | ep_monitor.data.fd = fd_monitor; | |
912541b0 KS |
392 | |
393 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
394 | if (fd_ep < 0) { | |
6af5e6a4 | 395 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
912541b0 KS |
396 | goto out; |
397 | } | |
398 | ||
912541b0 KS |
399 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
400 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
6af5e6a4 | 401 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
912541b0 KS |
402 | goto out; |
403 | } | |
404 | ||
405 | /* request TERM signal if parent exits */ | |
406 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
407 | ||
145dae7e | 408 | /* reset OOM score, we only protect the main daemon */ |
ad118bda | 409 | write_string_file("/proc/self/oom_score_adj", "0", 0); |
145dae7e | 410 | |
912541b0 KS |
411 | for (;;) { |
412 | struct udev_event *udev_event; | |
6af5e6a4 | 413 | int fd_lock = -1; |
912541b0 | 414 | |
3b64e4d4 TG |
415 | assert(dev); |
416 | ||
9f6445e3 | 417 | log_debug("seq %llu running", udev_device_get_seqnum(dev)); |
912541b0 KS |
418 | udev_event = udev_event_new(dev); |
419 | if (udev_event == NULL) { | |
6af5e6a4 | 420 | r = -ENOMEM; |
912541b0 KS |
421 | goto out; |
422 | } | |
423 | ||
bba7a484 TG |
424 | if (arg_exec_delay > 0) |
425 | udev_event->exec_delay = arg_exec_delay; | |
912541b0 | 426 | |
3ebdb81e | 427 | /* |
2e5b17d0 | 428 | * Take a shared lock on the device node; this establishes |
3ebdb81e | 429 | * a concept of device "ownership" to serialize device |
2e5b17d0 | 430 | * access. External processes holding an exclusive lock will |
3ebdb81e | 431 | * cause udev to skip the event handling; in the case udev |
2e5b17d0 | 432 | * acquired the lock, the external process can block until |
3ebdb81e KS |
433 | * udev has finished its event handling. |
434 | */ | |
2e5b17d0 KS |
435 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
436 | streq_ptr("block", udev_device_get_subsystem(dev)) && | |
437 | !startswith(udev_device_get_sysname(dev), "dm-") && | |
438 | !startswith(udev_device_get_sysname(dev), "md")) { | |
3ebdb81e KS |
439 | struct udev_device *d = dev; |
440 | ||
441 | if (streq_ptr("partition", udev_device_get_devtype(d))) | |
442 | d = udev_device_get_parent(d); | |
443 | ||
444 | if (d) { | |
445 | fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
446 | if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { | |
56f64d95 | 447 | log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); |
3d06f418 | 448 | fd_lock = safe_close(fd_lock); |
3ebdb81e KS |
449 | goto skip; |
450 | } | |
451 | } | |
452 | } | |
453 | ||
4c83d994 TG |
454 | /* needed for renaming netifs */ |
455 | udev_event->rtnl = rtnl; | |
456 | ||
912541b0 | 457 | /* apply rules, create node, symlinks */ |
adeba500 KS |
458 | udev_event_execute_rules(udev_event, |
459 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
c0c6806b | 460 | &manager->properties, |
8314de1d | 461 | manager->rules); |
adeba500 KS |
462 | |
463 | udev_event_execute_run(udev_event, | |
8314de1d | 464 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
912541b0 | 465 | |
523c620b TG |
466 | if (udev_event->rtnl) |
467 | /* in case rtnl was initialized */ | |
1c4baffc | 468 | rtnl = sd_netlink_ref(udev_event->rtnl); |
4c83d994 | 469 | |
912541b0 | 470 | /* apply/restore inotify watch */ |
bf9bead1 | 471 | if (udev_event->inotify_watch) { |
912541b0 KS |
472 | udev_watch_begin(udev, dev); |
473 | udev_device_update_db(dev); | |
474 | } | |
475 | ||
3d06f418 | 476 | safe_close(fd_lock); |
3ebdb81e | 477 | |
912541b0 KS |
478 | /* send processed event back to libudev listeners */ |
479 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
480 | ||
3ebdb81e | 481 | skip: |
4914cb2d | 482 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
b66f29a1 | 483 | |
912541b0 | 484 | /* send udevd the result of the event execution */ |
e237d8cb | 485 | r = worker_send_message(manager->worker_watch[WRITE_END]); |
b66f29a1 | 486 | if (r < 0) |
9a73bd7c | 487 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", |
b66f29a1 | 488 | udev_device_get_seqnum(dev)); |
912541b0 KS |
489 | |
490 | udev_device_unref(dev); | |
491 | dev = NULL; | |
492 | ||
73814ca2 | 493 | udev_event_unref(udev_event); |
47e737dc | 494 | |
912541b0 KS |
495 | /* wait for more device messages from main udevd, or term signal */ |
496 | while (dev == NULL) { | |
497 | struct epoll_event ev[4]; | |
498 | int fdcount; | |
499 | int i; | |
500 | ||
8fef0ff2 | 501 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); |
912541b0 KS |
502 | if (fdcount < 0) { |
503 | if (errno == EINTR) | |
504 | continue; | |
6af5e6a4 | 505 | r = log_error_errno(errno, "failed to poll: %m"); |
912541b0 KS |
506 | goto out; |
507 | } | |
508 | ||
509 | for (i = 0; i < fdcount; i++) { | |
510 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
511 | dev = udev_monitor_receive_device(worker_monitor); | |
512 | break; | |
513 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
514 | struct signalfd_siginfo fdsi; | |
515 | ssize_t size; | |
516 | ||
517 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
518 | if (size != sizeof(struct signalfd_siginfo)) | |
519 | continue; | |
520 | switch (fdsi.ssi_signo) { | |
521 | case SIGTERM: | |
522 | goto out; | |
523 | } | |
524 | } | |
525 | } | |
526 | } | |
527 | } | |
82063a88 | 528 | out: |
912541b0 | 529 | udev_device_unref(dev); |
e237d8cb | 530 | manager_free(manager); |
baa30fbc | 531 | log_close(); |
8b46c3fc | 532 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
912541b0 KS |
533 | } |
534 | case -1: | |
912541b0 | 535 | event->state = EVENT_QUEUED; |
56f64d95 | 536 | log_error_errno(errno, "fork of child failed: %m"); |
912541b0 KS |
537 | break; |
538 | default: | |
e03c7cc2 TG |
539 | { |
540 | struct worker *worker; | |
541 | ||
c0c6806b | 542 | r = worker_new(&worker, manager, worker_monitor, pid); |
3a19b32a | 543 | if (r < 0) |
e03c7cc2 | 544 | return; |
e03c7cc2 | 545 | |
39c19cf1 TG |
546 | worker_attach_event(worker, event); |
547 | ||
1fa2f38f | 548 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
912541b0 KS |
549 | break; |
550 | } | |
e03c7cc2 | 551 | } |
7fafc032 KS |
552 | } |
553 | ||
c0c6806b | 554 | static void event_run(Manager *manager, struct event *event) { |
a505965d TG |
555 | struct worker *worker; |
556 | Iterator i; | |
912541b0 | 557 | |
c0c6806b TG |
558 | assert(manager); |
559 | assert(event); | |
560 | ||
561 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
562 | ssize_t count; |
563 | ||
564 | if (worker->state != WORKER_IDLE) | |
565 | continue; | |
566 | ||
c0c6806b | 567 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
912541b0 | 568 | if (count < 0) { |
1fa2f38f ZJS |
569 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
570 | worker->pid, count); | |
912541b0 KS |
571 | kill(worker->pid, SIGKILL); |
572 | worker->state = WORKER_KILLED; | |
573 | continue; | |
574 | } | |
39c19cf1 | 575 | worker_attach_event(worker, event); |
912541b0 KS |
576 | return; |
577 | } | |
578 | ||
c0c6806b | 579 | if (hashmap_size(manager->workers) >= arg_children_max) { |
bba7a484 | 580 | if (arg_children_max > 1) |
c0c6806b | 581 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
912541b0 KS |
582 | return; |
583 | } | |
584 | ||
585 | /* start new worker and pass initial device */ | |
c0c6806b | 586 | worker_spawn(manager, event); |
1e03b754 KS |
587 | } |
588 | ||
ecb17862 | 589 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
912541b0 | 590 | struct event *event; |
cb49a4f2 | 591 | int r; |
912541b0 | 592 | |
ecb17862 TG |
593 | assert(manager); |
594 | assert(dev); | |
595 | ||
040e6896 TG |
596 | /* only one process can add events to the queue */ |
597 | if (manager->pid == 0) | |
598 | manager->pid = getpid(); | |
599 | ||
cb49a4f2 TG |
600 | assert(manager->pid == getpid()); |
601 | ||
955d98c9 | 602 | event = new0(struct event, 1); |
cb49a4f2 TG |
603 | if (!event) |
604 | return -ENOMEM; | |
912541b0 KS |
605 | |
606 | event->udev = udev_device_get_udev(dev); | |
cb49a4f2 | 607 | event->manager = manager; |
912541b0 | 608 | event->dev = dev; |
6969c349 TG |
609 | event->dev_kernel = udev_device_shallow_clone(dev); |
610 | udev_device_copy_properties(event->dev_kernel, dev); | |
912541b0 KS |
611 | event->seqnum = udev_device_get_seqnum(dev); |
612 | event->devpath = udev_device_get_devpath(dev); | |
613 | event->devpath_len = strlen(event->devpath); | |
614 | event->devpath_old = udev_device_get_devpath_old(dev); | |
615 | event->devnum = udev_device_get_devnum(dev); | |
ea6039a3 | 616 | event->is_block = streq("block", udev_device_get_subsystem(dev)); |
912541b0 KS |
617 | event->ifindex = udev_device_get_ifindex(dev); |
618 | ||
9f6445e3 | 619 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
912541b0 KS |
620 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
621 | ||
622 | event->state = EVENT_QUEUED; | |
cb49a4f2 TG |
623 | |
624 | if (udev_list_node_is_empty(&manager->events)) { | |
625 | r = touch("/run/udev/queue"); | |
626 | if (r < 0) | |
627 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
628 | } | |
629 | ||
ecb17862 | 630 | udev_list_node_append(&event->node, &manager->events); |
cb49a4f2 | 631 | |
912541b0 | 632 | return 0; |
fc465079 KS |
633 | } |
634 | ||
c0c6806b | 635 | static void manager_kill_workers(Manager *manager) { |
a505965d TG |
636 | struct worker *worker; |
637 | Iterator i; | |
1e03b754 | 638 | |
c0c6806b TG |
639 | assert(manager); |
640 | ||
641 | HASHMAP_FOREACH(worker, manager->workers, i) { | |
912541b0 KS |
642 | if (worker->state == WORKER_KILLED) |
643 | continue; | |
1e03b754 | 644 | |
912541b0 KS |
645 | worker->state = WORKER_KILLED; |
646 | kill(worker->pid, SIGTERM); | |
647 | } | |
1e03b754 KS |
648 | } |
649 | ||
e3196993 | 650 | /* lookup event for identical, parent, child device */ |
ecb17862 | 651 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
912541b0 KS |
652 | struct udev_list_node *loop; |
653 | size_t common; | |
654 | ||
655 | /* check if queue contains events we depend on */ | |
ecb17862 | 656 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 KS |
657 | struct event *loop_event = node_to_event(loop); |
658 | ||
659 | /* we already found a later event, earlier can not block us, no need to check again */ | |
660 | if (loop_event->seqnum < event->delaying_seqnum) | |
661 | continue; | |
662 | ||
663 | /* event we checked earlier still exists, no need to check again */ | |
664 | if (loop_event->seqnum == event->delaying_seqnum) | |
665 | return true; | |
666 | ||
667 | /* found ourself, no later event can block us */ | |
668 | if (loop_event->seqnum >= event->seqnum) | |
669 | break; | |
670 | ||
671 | /* check major/minor */ | |
672 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
673 | return true; | |
674 | ||
675 | /* check network device ifindex */ | |
676 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
677 | return true; | |
678 | ||
679 | /* check our old name */ | |
090be865 | 680 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { |
912541b0 KS |
681 | event->delaying_seqnum = loop_event->seqnum; |
682 | return true; | |
683 | } | |
684 | ||
685 | /* compare devpath */ | |
686 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
687 | ||
688 | /* one devpath is contained in the other? */ | |
689 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
690 | continue; | |
691 | ||
692 | /* identical device event found */ | |
693 | if (loop_event->devpath_len == event->devpath_len) { | |
694 | /* devices names might have changed/swapped in the meantime */ | |
695 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
696 | continue; | |
697 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
698 | continue; | |
699 | event->delaying_seqnum = loop_event->seqnum; | |
700 | return true; | |
701 | } | |
702 | ||
703 | /* parent device event found */ | |
704 | if (event->devpath[common] == '/') { | |
705 | event->delaying_seqnum = loop_event->seqnum; | |
706 | return true; | |
707 | } | |
708 | ||
709 | /* child device event found */ | |
710 | if (loop_event->devpath[common] == '/') { | |
711 | event->delaying_seqnum = loop_event->seqnum; | |
712 | return true; | |
713 | } | |
714 | ||
715 | /* no matching device */ | |
716 | continue; | |
717 | } | |
718 | ||
719 | return false; | |
7fafc032 KS |
720 | } |
721 | ||
693d371d TG |
722 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
723 | Manager *manager = userdata; | |
724 | ||
725 | assert(manager); | |
726 | ||
727 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
728 | ||
729 | sd_event_exit(manager->event, -ETIMEDOUT); | |
730 | ||
731 | return 1; | |
732 | } | |
733 | ||
62d43dac | 734 | static void manager_exit(Manager *manager) { |
693d371d TG |
735 | uint64_t usec; |
736 | int r; | |
62d43dac TG |
737 | |
738 | assert(manager); | |
739 | ||
740 | manager->exit = true; | |
741 | ||
b79aacbf TG |
742 | sd_notify(false, |
743 | "STOPPING=1\n" | |
744 | "STATUS=Starting shutdown..."); | |
745 | ||
62d43dac | 746 | /* close sources of new events and discard buffered events */ |
693d371d | 747 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); |
ab7854df | 748 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
62d43dac | 749 | |
693d371d | 750 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); |
ab7854df | 751 | manager->fd_inotify = safe_close(manager->fd_inotify); |
62d43dac | 752 | |
693d371d | 753 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); |
ab7854df | 754 | manager->monitor = udev_monitor_unref(manager->monitor); |
62d43dac TG |
755 | |
756 | /* discard queued events and kill workers */ | |
757 | event_queue_cleanup(manager, EVENT_QUEUED); | |
758 | manager_kill_workers(manager); | |
693d371d | 759 | |
38a03f06 | 760 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
693d371d TG |
761 | |
762 | r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), | |
763 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); | |
764 | if (r < 0) | |
765 | return; | |
62d43dac TG |
766 | } |
767 | ||
768 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
769 | static void manager_reload(Manager *manager) { | |
770 | ||
771 | assert(manager); | |
772 | ||
b79aacbf TG |
773 | sd_notify(false, |
774 | "RELOADING=1\n" | |
775 | "STATUS=Flushing configuration..."); | |
776 | ||
62d43dac TG |
777 | manager_kill_workers(manager); |
778 | manager->rules = udev_rules_unref(manager->rules); | |
779 | udev_builtin_exit(manager->udev); | |
b79aacbf TG |
780 | |
781 | sd_notify(false, | |
782 | "READY=1\n" | |
783 | "STATUS=Processing..."); | |
62d43dac TG |
784 | } |
785 | ||
c0c6806b | 786 | static void event_queue_start(Manager *manager) { |
912541b0 | 787 | struct udev_list_node *loop; |
693d371d | 788 | usec_t usec; |
8ab44e3f | 789 | |
c0c6806b TG |
790 | assert(manager); |
791 | ||
7c4c7e89 TG |
792 | if (udev_list_node_is_empty(&manager->events) || |
793 | manager->exit || manager->stop_exec_queue) | |
794 | return; | |
795 | ||
38a03f06 LP |
796 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
797 | /* check for changed config, every 3 seconds at most */ | |
798 | if (manager->last_usec == 0 || | |
799 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
800 | if (udev_rules_check_timestamp(manager->rules) || | |
801 | udev_builtin_validate(manager->udev)) | |
802 | manager_reload(manager); | |
693d371d | 803 | |
38a03f06 | 804 | manager->last_usec = usec; |
7c4c7e89 TG |
805 | } |
806 | ||
807 | udev_builtin_init(manager->udev); | |
808 | ||
809 | if (!manager->rules) { | |
810 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
811 | if (!manager->rules) | |
812 | return; | |
813 | } | |
814 | ||
ecb17862 | 815 | udev_list_node_foreach(loop, &manager->events) { |
912541b0 | 816 | struct event *event = node_to_event(loop); |
0bc74ea7 | 817 | |
912541b0 KS |
818 | if (event->state != EVENT_QUEUED) |
819 | continue; | |
0bc74ea7 | 820 | |
912541b0 | 821 | /* do not start event if parent or child event is still running */ |
ecb17862 | 822 | if (is_devpath_busy(manager, event)) |
912541b0 | 823 | continue; |
fc465079 | 824 | |
c0c6806b | 825 | event_run(manager, event); |
912541b0 | 826 | } |
1e03b754 KS |
827 | } |
828 | ||
ecb17862 | 829 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
912541b0 | 830 | struct udev_list_node *loop, *tmp; |
ff2c503d | 831 | |
ecb17862 | 832 | udev_list_node_foreach_safe(loop, tmp, &manager->events) { |
912541b0 | 833 | struct event *event = node_to_event(loop); |
ff2c503d | 834 | |
912541b0 KS |
835 | if (match_type != EVENT_UNDEF && match_type != event->state) |
836 | continue; | |
ff2c503d | 837 | |
c6aa11f2 | 838 | event_free(event); |
912541b0 | 839 | } |
ff2c503d KS |
840 | } |
841 | ||
e82e8fa5 | 842 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b TG |
843 | Manager *manager = userdata; |
844 | ||
845 | assert(manager); | |
846 | ||
912541b0 KS |
847 | for (;;) { |
848 | struct worker_message msg; | |
979558f3 TG |
849 | struct iovec iovec = { |
850 | .iov_base = &msg, | |
851 | .iov_len = sizeof(msg), | |
852 | }; | |
853 | union { | |
854 | struct cmsghdr cmsghdr; | |
855 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
856 | } control = {}; | |
857 | struct msghdr msghdr = { | |
858 | .msg_iov = &iovec, | |
859 | .msg_iovlen = 1, | |
860 | .msg_control = &control, | |
861 | .msg_controllen = sizeof(control), | |
862 | }; | |
863 | struct cmsghdr *cmsg; | |
912541b0 | 864 | ssize_t size; |
979558f3 | 865 | struct ucred *ucred = NULL; |
a505965d | 866 | struct worker *worker; |
912541b0 | 867 | |
e82e8fa5 | 868 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
979558f3 | 869 | if (size < 0) { |
738a7907 TG |
870 | if (errno == EINTR) |
871 | continue; | |
872 | else if (errno == EAGAIN) | |
873 | /* nothing more to read */ | |
874 | break; | |
979558f3 | 875 | |
e82e8fa5 | 876 | return log_error_errno(errno, "failed to receive message: %m"); |
979558f3 TG |
877 | } else if (size != sizeof(struct worker_message)) { |
878 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
e82e8fa5 | 879 | continue; |
979558f3 TG |
880 | } |
881 | ||
2a1288ff | 882 | CMSG_FOREACH(cmsg, &msghdr) { |
979558f3 TG |
883 | if (cmsg->cmsg_level == SOL_SOCKET && |
884 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
885 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
886 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
887 | } | |
888 | ||
889 | if (!ucred || ucred->pid <= 0) { | |
890 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
891 | continue; | |
892 | } | |
912541b0 KS |
893 | |
894 | /* lookup worker who sent the signal */ | |
4a0b58c4 | 895 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
a505965d TG |
896 | if (!worker) { |
897 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
898 | continue; | |
912541b0 | 899 | } |
c0bbfd72 | 900 | |
a505965d TG |
901 | if (worker->state != WORKER_KILLED) |
902 | worker->state = WORKER_IDLE; | |
903 | ||
904 | /* worker returned */ | |
905 | event_free(worker->event); | |
912541b0 | 906 | } |
e82e8fa5 | 907 | |
8302fe5a TG |
908 | /* we have free workers, try to schedule events */ |
909 | event_queue_start(manager); | |
910 | ||
e82e8fa5 TG |
911 | return 1; |
912 | } | |
913 | ||
914 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
c0c6806b | 915 | Manager *manager = userdata; |
e82e8fa5 TG |
916 | struct udev_device *dev; |
917 | int r; | |
918 | ||
c0c6806b | 919 | assert(manager); |
e82e8fa5 | 920 | |
c0c6806b | 921 | dev = udev_monitor_receive_device(manager->monitor); |
e82e8fa5 TG |
922 | if (dev) { |
923 | udev_device_ensure_usec_initialized(dev, NULL); | |
ecb17862 | 924 | r = event_queue_insert(manager, dev); |
e82e8fa5 TG |
925 | if (r < 0) |
926 | udev_device_unref(dev); | |
8302fe5a TG |
927 | else |
928 | /* we have fresh events, try to schedule them */ | |
929 | event_queue_start(manager); | |
e82e8fa5 TG |
930 | } |
931 | ||
932 | return 1; | |
88f4b648 KS |
933 | } |
934 | ||
3b47c739 | 935 | /* receive the udevd message from userspace */ |
e82e8fa5 | 936 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 937 | Manager *manager = userdata; |
e4f66b77 TG |
938 | _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; |
939 | _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; | |
912541b0 KS |
940 | const char *str; |
941 | int i; | |
942 | ||
c0c6806b | 943 | assert(manager); |
e4f66b77 | 944 | |
c0c6806b | 945 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); |
e4f66b77 | 946 | if (!ctrl_conn) |
e82e8fa5 | 947 | return 1; |
912541b0 KS |
948 | |
949 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e4f66b77 | 950 | if (!ctrl_msg) |
e82e8fa5 | 951 | return 1; |
912541b0 KS |
952 | |
953 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
954 | if (i >= 0) { | |
ed14edc0 | 955 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
baa30fbc | 956 | log_set_max_level(i); |
c0c6806b | 957 | manager_kill_workers(manager); |
912541b0 KS |
958 | } |
959 | ||
960 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 961 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
c0c6806b | 962 | manager->stop_exec_queue = true; |
912541b0 KS |
963 | } |
964 | ||
965 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
9f6445e3 | 966 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
c0c6806b | 967 | manager->stop_exec_queue = false; |
8302fe5a | 968 | event_queue_start(manager); |
912541b0 KS |
969 | } |
970 | ||
971 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
9f6445e3 | 972 | log_debug("udevd message (RELOAD) received"); |
62d43dac | 973 | manager_reload(manager); |
912541b0 KS |
974 | } |
975 | ||
976 | str = udev_ctrl_get_set_env(ctrl_msg); | |
977 | if (str != NULL) { | |
c0c6806b | 978 | _cleanup_free_ char *key = NULL; |
912541b0 KS |
979 | |
980 | key = strdup(str); | |
c0c6806b | 981 | if (key) { |
912541b0 KS |
982 | char *val; |
983 | ||
984 | val = strchr(key, '='); | |
985 | if (val != NULL) { | |
986 | val[0] = '\0'; | |
987 | val = &val[1]; | |
988 | if (val[0] == '\0') { | |
9f6445e3 | 989 | log_debug("udevd message (ENV) received, unset '%s'", key); |
c0c6806b | 990 | udev_list_entry_add(&manager->properties, key, NULL); |
912541b0 | 991 | } else { |
9f6445e3 | 992 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); |
c0c6806b | 993 | udev_list_entry_add(&manager->properties, key, val); |
912541b0 | 994 | } |
c0c6806b | 995 | } else |
9f6445e3 | 996 | log_error("wrong key format '%s'", key); |
912541b0 | 997 | } |
c0c6806b | 998 | manager_kill_workers(manager); |
912541b0 KS |
999 | } |
1000 | ||
1001 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
1002 | if (i >= 0) { | |
9f6445e3 | 1003 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
bba7a484 | 1004 | arg_children_max = i; |
912541b0 KS |
1005 | } |
1006 | ||
cb49a4f2 | 1007 | if (udev_ctrl_get_ping(ctrl_msg) > 0) |
9f6445e3 | 1008 | log_debug("udevd message (SYNC) received"); |
912541b0 KS |
1009 | |
1010 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
9f6445e3 | 1011 | log_debug("udevd message (EXIT) received"); |
62d43dac | 1012 | manager_exit(manager); |
c0c6806b TG |
1013 | /* keep reference to block the client until we exit |
1014 | TODO: deal with several blocking exit requests */ | |
1015 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
912541b0 | 1016 | } |
e4f66b77 | 1017 | |
e82e8fa5 | 1018 | return 1; |
88f4b648 | 1019 | } |
4a231017 | 1020 | |
f3a740a5 | 1021 | static int synthesize_change(struct udev_device *dev) { |
edd32000 | 1022 | char filename[UTIL_PATH_SIZE]; |
f3a740a5 | 1023 | int r; |
edd32000 | 1024 | |
f3a740a5 | 1025 | if (streq_ptr("block", udev_device_get_subsystem(dev)) && |
ede34445 | 1026 | streq_ptr("disk", udev_device_get_devtype(dev)) && |
638ca89c | 1027 | !startswith(udev_device_get_sysname(dev), "dm-")) { |
e9fc29f4 KS |
1028 | bool part_table_read = false; |
1029 | bool has_partitions = false; | |
ede34445 | 1030 | int fd; |
f3a740a5 KS |
1031 | struct udev *udev = udev_device_get_udev(dev); |
1032 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
1033 | struct udev_list_entry *item; | |
1034 | ||
ede34445 | 1035 | /* |
e9fc29f4 KS |
1036 | * Try to re-read the partition table. This only succeeds if |
1037 | * none of the devices is busy. The kernel returns 0 if no | |
1038 | * partition table is found, and we will not get an event for | |
1039 | * the disk. | |
ede34445 | 1040 | */ |
02ba8fb3 | 1041 | fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); |
ede34445 | 1042 | if (fd >= 0) { |
02ba8fb3 KS |
1043 | r = flock(fd, LOCK_EX|LOCK_NB); |
1044 | if (r >= 0) | |
1045 | r = ioctl(fd, BLKRRPART, 0); | |
1046 | ||
ede34445 KS |
1047 | close(fd); |
1048 | if (r >= 0) | |
e9fc29f4 | 1049 | part_table_read = true; |
ede34445 KS |
1050 | } |
1051 | ||
e9fc29f4 | 1052 | /* search for partitions */ |
f3a740a5 KS |
1053 | e = udev_enumerate_new(udev); |
1054 | if (!e) | |
1055 | return -ENOMEM; | |
1056 | ||
1057 | r = udev_enumerate_add_match_parent(e, dev); | |
1058 | if (r < 0) | |
1059 | return r; | |
1060 | ||
1061 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
1062 | if (r < 0) | |
1063 | return r; | |
1064 | ||
1065 | r = udev_enumerate_scan_devices(e); | |
47a3fa0f TA |
1066 | if (r < 0) |
1067 | return r; | |
e9fc29f4 KS |
1068 | |
1069 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1070 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1071 | ||
1072 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1073 | if (!d) | |
1074 | continue; | |
1075 | ||
1076 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1077 | continue; | |
1078 | ||
1079 | has_partitions = true; | |
1080 | break; | |
1081 | } | |
1082 | ||
1083 | /* | |
1084 | * We have partitions and re-read the table, the kernel already sent | |
1085 | * out a "change" event for the disk, and "remove/add" for all | |
1086 | * partitions. | |
1087 | */ | |
1088 | if (part_table_read && has_partitions) | |
1089 | return 0; | |
1090 | ||
1091 | /* | |
1092 | * We have partitions but re-reading the partition table did not | |
1093 | * work, synthesize "change" for the disk and all partitions. | |
1094 | */ | |
1095 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1096 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1097 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
e9fc29f4 | 1098 | |
f3a740a5 KS |
1099 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { |
1100 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1101 | ||
1102 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1103 | if (!d) | |
1104 | continue; | |
1105 | ||
1106 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1107 | continue; | |
1108 | ||
1109 | log_debug("device %s closed, synthesising partition '%s' 'change'", | |
1110 | udev_device_get_devnode(dev), udev_device_get_devnode(d)); | |
1111 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); | |
4c1fc3e4 | 1112 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
f3a740a5 | 1113 | } |
ede34445 KS |
1114 | |
1115 | return 0; | |
f3a740a5 KS |
1116 | } |
1117 | ||
ede34445 KS |
1118 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); |
1119 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
4c1fc3e4 | 1120 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
ede34445 | 1121 | |
f3a740a5 | 1122 | return 0; |
edd32000 KS |
1123 | } |
1124 | ||
e82e8fa5 | 1125 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
c0c6806b | 1126 | Manager *manager = userdata; |
0254e944 | 1127 | union inotify_event_buffer buffer; |
f7c1ad4f LP |
1128 | struct inotify_event *e; |
1129 | ssize_t l; | |
912541b0 | 1130 | |
c0c6806b | 1131 | assert(manager); |
e82e8fa5 TG |
1132 | |
1133 | l = read(fd, &buffer, sizeof(buffer)); | |
f7c1ad4f LP |
1134 | if (l < 0) { |
1135 | if (errno == EAGAIN || errno == EINTR) | |
e82e8fa5 | 1136 | return 1; |
912541b0 | 1137 | |
f7c1ad4f | 1138 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
912541b0 KS |
1139 | } |
1140 | ||
f7c1ad4f | 1141 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
e82e8fa5 | 1142 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; |
912541b0 | 1143 | |
c0c6806b | 1144 | dev = udev_watch_lookup(manager->udev, e->wd); |
edd32000 KS |
1145 | if (!dev) |
1146 | continue; | |
912541b0 | 1147 | |
f7c1ad4f | 1148 | log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); |
a8389097 | 1149 | if (e->mask & IN_CLOSE_WRITE) { |
edd32000 | 1150 | synthesize_change(dev); |
a8389097 TG |
1151 | |
1152 | /* settle might be waiting on us to determine the queue | |
1153 | * state. If we just handled an inotify event, we might have | |
1154 | * generated a "change" event, but we won't have queued up | |
1155 | * the resultant uevent yet. Do that. | |
1156 | */ | |
c0c6806b | 1157 | on_uevent(NULL, -1, 0, manager); |
a8389097 | 1158 | } else if (e->mask & IN_IGNORED) |
c0c6806b | 1159 | udev_watch_end(manager->udev, dev); |
912541b0 KS |
1160 | } |
1161 | ||
e82e8fa5 | 1162 | return 1; |
bd284db1 SJR |
1163 | } |
1164 | ||
0561329d | 1165 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1166 | Manager *manager = userdata; |
1167 | ||
1168 | assert(manager); | |
1169 | ||
62d43dac | 1170 | manager_exit(manager); |
912541b0 | 1171 | |
e82e8fa5 TG |
1172 | return 1; |
1173 | } | |
912541b0 | 1174 | |
0561329d | 1175 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1176 | Manager *manager = userdata; |
1177 | ||
1178 | assert(manager); | |
1179 | ||
62d43dac | 1180 | manager_reload(manager); |
912541b0 | 1181 | |
e82e8fa5 TG |
1182 | return 1; |
1183 | } | |
912541b0 | 1184 | |
e82e8fa5 | 1185 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
c0c6806b TG |
1186 | Manager *manager = userdata; |
1187 | ||
1188 | assert(manager); | |
1189 | ||
e82e8fa5 TG |
1190 | for (;;) { |
1191 | pid_t pid; | |
1192 | int status; | |
1193 | struct worker *worker; | |
d1317d02 | 1194 | |
e82e8fa5 TG |
1195 | pid = waitpid(-1, &status, WNOHANG); |
1196 | if (pid <= 0) | |
f29328d6 | 1197 | break; |
e82e8fa5 | 1198 | |
4a0b58c4 | 1199 | worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); |
e82e8fa5 TG |
1200 | if (!worker) { |
1201 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
f29328d6 | 1202 | continue; |
912541b0 | 1203 | } |
e82e8fa5 TG |
1204 | |
1205 | if (WIFEXITED(status)) { | |
1206 | if (WEXITSTATUS(status) == 0) | |
1207 | log_debug("worker ["PID_FMT"] exited", pid); | |
1208 | else | |
1209 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1210 | } else if (WIFSIGNALED(status)) { | |
1211 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); | |
1212 | } else if (WIFSTOPPED(status)) { | |
1213 | log_info("worker ["PID_FMT"] stopped", pid); | |
f29328d6 | 1214 | continue; |
e82e8fa5 TG |
1215 | } else if (WIFCONTINUED(status)) { |
1216 | log_info("worker ["PID_FMT"] continued", pid); | |
f29328d6 | 1217 | continue; |
e82e8fa5 TG |
1218 | } else |
1219 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1220 | ||
1221 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1222 | if (worker->event) { | |
1223 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1224 | /* delete state from disk */ | |
1225 | udev_device_delete_db(worker->event->dev); | |
1226 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1227 | /* forward kernel event without amending it */ | |
c0c6806b | 1228 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); |
e82e8fa5 TG |
1229 | } |
1230 | } | |
1231 | ||
1232 | worker_free(worker); | |
912541b0 | 1233 | } |
e82e8fa5 | 1234 | |
8302fe5a TG |
1235 | /* we can start new workers, try to schedule events */ |
1236 | event_queue_start(manager); | |
1237 | ||
e82e8fa5 | 1238 | return 1; |
f27125f9 | 1239 | } |
1240 | ||
693d371d TG |
1241 | static int on_post(sd_event_source *s, void *userdata) { |
1242 | Manager *manager = userdata; | |
1243 | int r; | |
1244 | ||
1245 | assert(manager); | |
1246 | ||
1247 | if (udev_list_node_is_empty(&manager->events)) { | |
1248 | /* no pending events */ | |
1249 | if (!hashmap_isempty(manager->workers)) { | |
1250 | /* there are idle workers */ | |
1251 | log_debug("cleanup idle workers"); | |
1252 | manager_kill_workers(manager); | |
1253 | } else { | |
1254 | /* we are idle */ | |
1255 | if (manager->exit) { | |
1256 | r = sd_event_exit(manager->event, 0); | |
1257 | if (r < 0) | |
1258 | return r; | |
1259 | } else if (manager->cgroup) | |
1260 | /* cleanup possible left-over processes in our cgroup */ | |
1261 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, false, true, NULL); | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | return 1; | |
1266 | } | |
1267 | ||
fcff1e72 | 1268 | static int listen_fds(int *rctrl, int *rnetlink) { |
f59118ec | 1269 | _cleanup_udev_unref_ struct udev *udev = NULL; |
fcff1e72 | 1270 | int ctrl_fd = -1, netlink_fd = -1; |
f59118ec | 1271 | int fd, n, r; |
912541b0 | 1272 | |
fcff1e72 TG |
1273 | assert(rctrl); |
1274 | assert(rnetlink); | |
1275 | ||
912541b0 | 1276 | n = sd_listen_fds(true); |
fcff1e72 TG |
1277 | if (n < 0) |
1278 | return n; | |
912541b0 KS |
1279 | |
1280 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1281 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
fcff1e72 TG |
1282 | if (ctrl_fd >= 0) |
1283 | return -EINVAL; | |
1284 | ctrl_fd = fd; | |
912541b0 KS |
1285 | continue; |
1286 | } | |
1287 | ||
1288 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
fcff1e72 TG |
1289 | if (netlink_fd >= 0) |
1290 | return -EINVAL; | |
1291 | netlink_fd = fd; | |
912541b0 KS |
1292 | continue; |
1293 | } | |
1294 | ||
fcff1e72 | 1295 | return -EINVAL; |
912541b0 KS |
1296 | } |
1297 | ||
f59118ec TG |
1298 | if (ctrl_fd < 0) { |
1299 | _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL; | |
1300 | ||
1301 | udev = udev_new(); | |
1302 | if (!udev) | |
1303 | return -ENOMEM; | |
1304 | ||
1305 | ctrl = udev_ctrl_new(udev); | |
1306 | if (!ctrl) | |
1307 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1308 | ||
1309 | r = udev_ctrl_enable_receiving(ctrl); | |
1310 | if (r < 0) | |
1311 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1312 | ||
1313 | fd = udev_ctrl_get_fd(ctrl); | |
1314 | if (fd < 0) | |
1315 | return log_error_errno(EIO, "could not get ctrl fd"); | |
fcff1e72 | 1316 | |
f59118ec TG |
1317 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); |
1318 | if (ctrl_fd < 0) | |
1319 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1320 | } | |
1321 | ||
1322 | if (netlink_fd < 0) { | |
1323 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
1324 | ||
1325 | if (!udev) { | |
1326 | udev = udev_new(); | |
1327 | if (!udev) | |
1328 | return -ENOMEM; | |
1329 | } | |
1330 | ||
1331 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1332 | if (!monitor) | |
1333 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1334 | ||
1335 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1336 | ||
1337 | r = udev_monitor_enable_receiving(monitor); | |
1338 | if (r < 0) | |
1339 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1340 | ||
1341 | fd = udev_monitor_get_fd(monitor); | |
1342 | if (fd < 0) | |
1343 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1344 | ||
1345 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
1346 | if (ctrl_fd < 0) | |
1347 | return log_error_errno(errno, "could not dup netlink fd: %m"); | |
1348 | } | |
fcff1e72 TG |
1349 | |
1350 | *rctrl = ctrl_fd; | |
1351 | *rnetlink = netlink_fd; | |
912541b0 | 1352 | |
912541b0 | 1353 | return 0; |
7459bcdc KS |
1354 | } |
1355 | ||
e6f86cac | 1356 | /* |
3f85ef0f | 1357 | * read the kernel command line, in case we need to get into debug mode |
614a823c TG |
1358 | * udev.log-priority=<level> syslog priority |
1359 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1360 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1361 | * udev.event-timeout=<number of seconds> seconds to wait before terminating an event | |
e6f86cac | 1362 | */ |
614a823c | 1363 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
3567afa5 | 1364 | const char *full_key = key; |
74df0fca | 1365 | int r; |
e6f86cac | 1366 | |
614a823c | 1367 | assert(key); |
e6f86cac | 1368 | |
614a823c TG |
1369 | if (!value) |
1370 | return 0; | |
e6f86cac | 1371 | |
614a823c TG |
1372 | if (startswith(key, "rd.")) |
1373 | key += strlen("rd."); | |
e6f86cac | 1374 | |
614a823c TG |
1375 | if (startswith(key, "udev.")) |
1376 | key += strlen("udev."); | |
1377 | else | |
1378 | return 0; | |
e6f86cac | 1379 | |
614a823c TG |
1380 | if (streq(key, "log-priority")) { |
1381 | int prio; | |
e6f86cac | 1382 | |
614a823c | 1383 | prio = util_log_priority(value); |
e00f5bdd | 1384 | if (prio < 0) |
3567afa5 MS |
1385 | goto invalid; |
1386 | log_set_max_level(prio); | |
614a823c | 1387 | } else if (streq(key, "children-max")) { |
020328e1 | 1388 | r = safe_atou(value, &arg_children_max); |
614a823c | 1389 | if (r < 0) |
3567afa5 | 1390 | goto invalid; |
614a823c TG |
1391 | } else if (streq(key, "exec-delay")) { |
1392 | r = safe_atoi(value, &arg_exec_delay); | |
1393 | if (r < 0) | |
3567afa5 | 1394 | goto invalid; |
614a823c TG |
1395 | } else if (streq(key, "event-timeout")) { |
1396 | r = safe_atou64(value, &arg_event_timeout_usec); | |
1397 | if (r < 0) | |
3567afa5 MS |
1398 | goto invalid; |
1399 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1400 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
e6f86cac | 1401 | } |
614a823c | 1402 | |
3567afa5 MS |
1403 | return 0; |
1404 | invalid: | |
1405 | log_warning("invalid %s ignored: %s", full_key, value); | |
614a823c | 1406 | return 0; |
e6f86cac KS |
1407 | } |
1408 | ||
ed216e1f TG |
1409 | static void help(void) { |
1410 | printf("%s [OPTIONS...]\n\n" | |
1411 | "Manages devices.\n\n" | |
5ac0162c LP |
1412 | " -h --help Print this message\n" |
1413 | " --version Print version of the program\n" | |
1414 | " --daemon Detach and run in the background\n" | |
1415 | " --debug Enable debug output\n" | |
1416 | " --children-max=INT Set maximum number of workers\n" | |
1417 | " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1418 | " --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1419 | " --resolve-names=early|late|never\n" | |
1420 | " When to resolve users and groups\n" | |
ed216e1f TG |
1421 | , program_invocation_short_name); |
1422 | } | |
1423 | ||
bba7a484 | 1424 | static int parse_argv(int argc, char *argv[]) { |
912541b0 | 1425 | static const struct option options[] = { |
bba7a484 TG |
1426 | { "daemon", no_argument, NULL, 'd' }, |
1427 | { "debug", no_argument, NULL, 'D' }, | |
1428 | { "children-max", required_argument, NULL, 'c' }, | |
1429 | { "exec-delay", required_argument, NULL, 'e' }, | |
1430 | { "event-timeout", required_argument, NULL, 't' }, | |
1431 | { "resolve-names", required_argument, NULL, 'N' }, | |
1432 | { "help", no_argument, NULL, 'h' }, | |
1433 | { "version", no_argument, NULL, 'V' }, | |
912541b0 KS |
1434 | {} |
1435 | }; | |
689a97f5 | 1436 | |
bba7a484 | 1437 | int c; |
689a97f5 | 1438 | |
bba7a484 TG |
1439 | assert(argc >= 0); |
1440 | assert(argv); | |
912541b0 | 1441 | |
e14b6f21 | 1442 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
f1e8664e | 1443 | int r; |
912541b0 | 1444 | |
bba7a484 | 1445 | switch (c) { |
912541b0 | 1446 | |
912541b0 | 1447 | case 'd': |
bba7a484 | 1448 | arg_daemonize = true; |
912541b0 KS |
1449 | break; |
1450 | case 'c': | |
020328e1 | 1451 | r = safe_atou(optarg, &arg_children_max); |
6f5cf8a8 TG |
1452 | if (r < 0) |
1453 | log_warning("Invalid --children-max ignored: %s", optarg); | |
912541b0 KS |
1454 | break; |
1455 | case 'e': | |
6f5cf8a8 TG |
1456 | r = safe_atoi(optarg, &arg_exec_delay); |
1457 | if (r < 0) | |
1458 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
912541b0 | 1459 | break; |
9719859c | 1460 | case 't': |
f1e8664e TG |
1461 | r = safe_atou64(optarg, &arg_event_timeout_usec); |
1462 | if (r < 0) | |
65fea570 | 1463 | log_warning("Invalid --event-timeout ignored: %s", optarg); |
6f5cf8a8 TG |
1464 | else { |
1465 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1466 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1467 | } | |
9719859c | 1468 | break; |
912541b0 | 1469 | case 'D': |
bba7a484 | 1470 | arg_debug = true; |
912541b0 KS |
1471 | break; |
1472 | case 'N': | |
090be865 | 1473 | if (streq(optarg, "early")) { |
bba7a484 | 1474 | arg_resolve_names = 1; |
090be865 | 1475 | } else if (streq(optarg, "late")) { |
bba7a484 | 1476 | arg_resolve_names = 0; |
090be865 | 1477 | } else if (streq(optarg, "never")) { |
bba7a484 | 1478 | arg_resolve_names = -1; |
912541b0 | 1479 | } else { |
9f6445e3 | 1480 | log_error("resolve-names must be early, late or never"); |
bba7a484 | 1481 | return 0; |
912541b0 KS |
1482 | } |
1483 | break; | |
1484 | case 'h': | |
ed216e1f | 1485 | help(); |
bba7a484 | 1486 | return 0; |
912541b0 KS |
1487 | case 'V': |
1488 | printf("%s\n", VERSION); | |
bba7a484 TG |
1489 | return 0; |
1490 | case '?': | |
1491 | return -EINVAL; | |
912541b0 | 1492 | default: |
bba7a484 TG |
1493 | assert_not_reached("Unhandled option"); |
1494 | ||
912541b0 KS |
1495 | } |
1496 | } | |
1497 | ||
bba7a484 TG |
1498 | return 1; |
1499 | } | |
1500 | ||
b7f74dd4 | 1501 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1502 | _cleanup_(manager_freep) Manager *manager = NULL; |
11b1dd8c | 1503 | int r, fd_worker, one = 1; |
c0c6806b TG |
1504 | |
1505 | assert(ret); | |
11b1dd8c TG |
1506 | assert(fd_ctrl >= 0); |
1507 | assert(fd_uevent >= 0); | |
c0c6806b TG |
1508 | |
1509 | manager = new0(Manager, 1); | |
1510 | if (!manager) | |
1511 | return log_oom(); | |
1512 | ||
e237d8cb TG |
1513 | manager->fd_inotify = -1; |
1514 | manager->worker_watch[WRITE_END] = -1; | |
1515 | manager->worker_watch[READ_END] = -1; | |
1516 | ||
c0c6806b TG |
1517 | manager->udev = udev_new(); |
1518 | if (!manager->udev) | |
1519 | return log_error_errno(errno, "could not allocate udev context: %m"); | |
1520 | ||
b2d21d93 TG |
1521 | udev_builtin_init(manager->udev); |
1522 | ||
ecb17862 TG |
1523 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); |
1524 | if (!manager->rules) | |
1525 | return log_error_errno(ENOMEM, "error reading rules"); | |
1526 | ||
1527 | udev_list_node_init(&manager->events); | |
1528 | udev_list_init(manager->udev, &manager->properties, true); | |
1529 | ||
c26d1879 TG |
1530 | manager->cgroup = cgroup; |
1531 | ||
f59118ec TG |
1532 | manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); |
1533 | if (!manager->ctrl) | |
1534 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e237d8cb | 1535 | |
f59118ec TG |
1536 | manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); |
1537 | if (!manager->monitor) | |
1538 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e237d8cb TG |
1539 | |
1540 | /* unnamed socket from workers to the main daemon */ | |
1541 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1542 | if (r < 0) | |
1543 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1544 | ||
693d371d | 1545 | fd_worker = manager->worker_watch[READ_END]; |
e237d8cb | 1546 | |
693d371d | 1547 | r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
e237d8cb TG |
1548 | if (r < 0) |
1549 | return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); | |
1550 | ||
1551 | manager->fd_inotify = udev_watch_init(manager->udev); | |
1552 | if (manager->fd_inotify < 0) | |
1553 | return log_error_errno(ENOMEM, "error initializing inotify"); | |
1554 | ||
1555 | udev_watch_restore(manager->udev); | |
1556 | ||
1557 | /* block and listen to all signals on signalfd */ | |
72c0a2c2 | 1558 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
693d371d | 1559 | |
49f997f3 TG |
1560 | r = sd_event_default(&manager->event); |
1561 | if (r < 0) | |
709f6e46 | 1562 | return log_error_errno(r, "could not allocate event loop: %m"); |
49f997f3 | 1563 | |
693d371d TG |
1564 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); |
1565 | if (r < 0) | |
1566 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1567 | ||
1568 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1569 | if (r < 0) | |
1570 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1571 | ||
1572 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1573 | if (r < 0) | |
1574 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1575 | ||
1576 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1577 | if (r < 0) | |
1578 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1579 | ||
1580 | r = sd_event_set_watchdog(manager->event, true); | |
1581 | if (r < 0) | |
1582 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1583 | ||
11b1dd8c | 1584 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); |
693d371d TG |
1585 | if (r < 0) |
1586 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1587 | ||
1588 | /* This needs to be after the inotify and uevent handling, to make sure | |
1589 | * that the ping is send back after fully processing the pending uevents | |
1590 | * (including the synthetic ones we may create due to inotify events). | |
1591 | */ | |
1592 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1593 | if (r < 0) | |
1594 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1595 | ||
1596 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1597 | if (r < 0) | |
1598 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1599 | ||
11b1dd8c | 1600 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); |
693d371d TG |
1601 | if (r < 0) |
1602 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1603 | ||
1604 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1605 | if (r < 0) | |
1606 | return log_error_errno(r, "error creating worker event source: %m"); | |
1607 | ||
1608 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1609 | if (r < 0) | |
1610 | return log_error_errno(r, "error creating post event source: %m"); | |
e237d8cb | 1611 | |
11b1dd8c TG |
1612 | *ret = manager; |
1613 | manager = NULL; | |
1614 | ||
86c3bece | 1615 | return 0; |
c0c6806b TG |
1616 | } |
1617 | ||
077fc5e2 | 1618 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
c0c6806b | 1619 | _cleanup_(manager_freep) Manager *manager = NULL; |
077fc5e2 DH |
1620 | int r; |
1621 | ||
1622 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1623 | if (r < 0) { | |
1624 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1625 | goto exit; | |
1626 | } | |
1627 | ||
1628 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1629 | if (r < 0) | |
1630 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1631 | ||
1632 | (void) sd_notify(false, | |
1633 | "READY=1\n" | |
1634 | "STATUS=Processing..."); | |
1635 | ||
1636 | r = sd_event_loop(manager->event); | |
1637 | if (r < 0) { | |
1638 | log_error_errno(r, "event loop failed: %m"); | |
1639 | goto exit; | |
1640 | } | |
1641 | ||
1642 | sd_event_get_exit_code(manager->event, &r); | |
1643 | ||
1644 | exit: | |
1645 | sd_notify(false, | |
1646 | "STOPPING=1\n" | |
1647 | "STATUS=Shutting down..."); | |
1648 | if (manager) | |
1649 | udev_ctrl_cleanup(manager->ctrl); | |
1650 | return r; | |
1651 | } | |
1652 | ||
1653 | int main(int argc, char *argv[]) { | |
c26d1879 | 1654 | _cleanup_free_ char *cgroup = NULL; |
b7f74dd4 | 1655 | int r, fd_ctrl, fd_uevent; |
bba7a484 | 1656 | |
bba7a484 TG |
1657 | log_set_target(LOG_TARGET_AUTO); |
1658 | log_parse_environment(); | |
1659 | log_open(); | |
1660 | ||
bba7a484 TG |
1661 | r = parse_argv(argc, argv); |
1662 | if (r <= 0) | |
1663 | goto exit; | |
1664 | ||
614a823c TG |
1665 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
1666 | if (r < 0) | |
1667 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
912541b0 | 1668 | |
78d3e041 KS |
1669 | if (arg_debug) { |
1670 | log_set_target(LOG_TARGET_CONSOLE); | |
bba7a484 | 1671 | log_set_max_level(LOG_DEBUG); |
78d3e041 | 1672 | } |
bba7a484 | 1673 | |
912541b0 | 1674 | if (getuid() != 0) { |
6af5e6a4 | 1675 | r = log_error_errno(EPERM, "root privileges required"); |
912541b0 KS |
1676 | goto exit; |
1677 | } | |
1678 | ||
712cebf1 TG |
1679 | if (arg_children_max == 0) { |
1680 | cpu_set_t cpu_set; | |
ebc164ef | 1681 | |
712cebf1 | 1682 | arg_children_max = 8; |
d457ff83 | 1683 | |
ece174c5 | 1684 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
920b52e4 | 1685 | arg_children_max += CPU_COUNT(&cpu_set) * 2; |
912541b0 | 1686 | |
712cebf1 | 1687 | log_debug("set children_max to %u", arg_children_max); |
d457ff83 | 1688 | } |
912541b0 | 1689 | |
712cebf1 TG |
1690 | /* set umask before creating any file/directory */ |
1691 | r = chdir("/"); | |
1692 | if (r < 0) { | |
1693 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1694 | goto exit; | |
1695 | } | |
194bbe33 | 1696 | |
712cebf1 | 1697 | umask(022); |
912541b0 | 1698 | |
712cebf1 TG |
1699 | r = mac_selinux_init("/dev"); |
1700 | if (r < 0) { | |
1701 | log_error_errno(r, "could not initialize labelling: %m"); | |
1702 | goto exit; | |
912541b0 KS |
1703 | } |
1704 | ||
712cebf1 TG |
1705 | r = mkdir("/run/udev", 0755); |
1706 | if (r < 0 && errno != EEXIST) { | |
1707 | r = log_error_errno(errno, "could not create /run/udev: %m"); | |
1708 | goto exit; | |
1709 | } | |
1710 | ||
03cfe0d5 | 1711 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
912541b0 | 1712 | |
c26d1879 TG |
1713 | if (getppid() == 1) { |
1714 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1715 | we only do this on systemd systems, and only if we are directly spawned | |
1716 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1717 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
11b9fb15 | 1718 | if (r < 0) { |
e859aa9e | 1719 | if (r == -ENOENT || r == -ENOEXEC) |
11b9fb15 TG |
1720 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1721 | else | |
1722 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1723 | } | |
c26d1879 TG |
1724 | } |
1725 | ||
b7f74dd4 TG |
1726 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1727 | if (r < 0) { | |
1728 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1729 | goto exit; | |
1730 | } | |
1731 | ||
bba7a484 | 1732 | if (arg_daemonize) { |
912541b0 | 1733 | pid_t pid; |
912541b0 | 1734 | |
3cbb2057 TG |
1735 | log_info("starting version " VERSION); |
1736 | ||
40e749b5 TG |
1737 | /* connect /dev/null to stdin, stdout, stderr */ |
1738 | if (log_get_max_level() < LOG_DEBUG) | |
1739 | (void) make_null_stdio(); | |
1740 | ||
912541b0 KS |
1741 | pid = fork(); |
1742 | switch (pid) { | |
1743 | case 0: | |
1744 | break; | |
1745 | case -1: | |
6af5e6a4 | 1746 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
912541b0 KS |
1747 | goto exit; |
1748 | default: | |
f53d1fcd TG |
1749 | mac_selinux_finish(); |
1750 | log_close(); | |
1751 | _exit(EXIT_SUCCESS); | |
912541b0 KS |
1752 | } |
1753 | ||
1754 | setsid(); | |
1755 | ||
ad118bda | 1756 | write_string_file("/proc/self/oom_score_adj", "-1000", 0); |
7500cd5e | 1757 | } |
912541b0 | 1758 | |
077fc5e2 | 1759 | r = run(fd_ctrl, fd_uevent, cgroup); |
693d371d | 1760 | |
53921bfa | 1761 | exit: |
cc56fafe | 1762 | mac_selinux_finish(); |
baa30fbc | 1763 | log_close(); |
6af5e6a4 | 1764 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
7fafc032 | 1765 | } |