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Commit | Line | Data |
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663996b3 MS |
1 | /* |
2 | * Copyright (C) 2004-2012 Kay Sievers <kay@vrfy.org> | |
3 | * Copyright (C) 2004 Chris Friesen <chris_friesen@sympatico.ca> | |
4 | * Copyright (C) 2009 Canonical Ltd. | |
5 | * Copyright (C) 2009 Scott James Remnant <scott@netsplit.com> | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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/>. | |
19 | */ | |
20 | ||
663996b3 | 21 | #include <errno.h> |
6300502b MP |
22 | #include <fcntl.h> |
23 | #include <getopt.h> | |
24 | #include <signal.h> | |
25 | #include <stdbool.h> | |
26 | #include <stddef.h> | |
663996b3 MS |
27 | #include <stdio.h> |
28 | #include <stdlib.h> | |
663996b3 | 29 | #include <string.h> |
6300502b | 30 | #include <sys/epoll.h> |
60f067b4 | 31 | #include <sys/file.h> |
6300502b MP |
32 | #include <sys/inotify.h> |
33 | #include <sys/ioctl.h> | |
34 | #include <sys/mount.h> | |
663996b3 | 35 | #include <sys/prctl.h> |
663996b3 | 36 | #include <sys/signalfd.h> |
6300502b | 37 | #include <sys/socket.h> |
663996b3 | 38 | #include <sys/stat.h> |
6300502b MP |
39 | #include <sys/time.h> |
40 | #include <sys/wait.h> | |
41 | #include <unistd.h> | |
663996b3 | 42 | |
663996b3 | 43 | #include "sd-daemon.h" |
86f210e9 MP |
44 | #include "sd-event.h" |
45 | ||
db2df898 | 46 | #include "alloc-util.h" |
663996b3 | 47 | #include "cgroup-util.h" |
6300502b | 48 | #include "cpu-set-util.h" |
663996b3 | 49 | #include "dev-setup.h" |
db2df898 | 50 | #include "fd-util.h" |
663996b3 | 51 | #include "fileio.h" |
e3bff60a | 52 | #include "formats-util.h" |
db2df898 | 53 | #include "fs-util.h" |
e3bff60a | 54 | #include "hashmap.h" |
db2df898 | 55 | #include "io-util.h" |
6300502b | 56 | #include "netlink-util.h" |
db2df898 MP |
57 | #include "parse-util.h" |
58 | #include "proc-cmdline.h" | |
6300502b MP |
59 | #include "process-util.h" |
60 | #include "selinux-util.h" | |
61 | #include "signal-util.h" | |
db2df898 MP |
62 | #include "socket-util.h" |
63 | #include "string-util.h" | |
6300502b MP |
64 | #include "terminal-util.h" |
65 | #include "udev-util.h" | |
66 | #include "udev.h" | |
db2df898 | 67 | #include "user-util.h" |
663996b3 | 68 | |
5eef597e MP |
69 | static bool arg_debug = false; |
70 | static int arg_daemonize = false; | |
71 | static int arg_resolve_names = 1; | |
e3bff60a | 72 | static unsigned arg_children_max; |
5eef597e MP |
73 | static int arg_exec_delay; |
74 | static usec_t arg_event_timeout_usec = 180 * USEC_PER_SEC; | |
75 | static usec_t arg_event_timeout_warn_usec = 180 * USEC_PER_SEC / 3; | |
e3bff60a MP |
76 | |
77 | typedef struct Manager { | |
78 | struct udev *udev; | |
86f210e9 | 79 | sd_event *event; |
e3bff60a MP |
80 | Hashmap *workers; |
81 | struct udev_list_node events; | |
86f210e9 | 82 | const char *cgroup; |
e3bff60a | 83 | pid_t pid; /* the process that originally allocated the manager object */ |
e3bff60a MP |
84 | |
85 | struct udev_rules *rules; | |
86 | struct udev_list properties; | |
87 | ||
88 | struct udev_monitor *monitor; | |
89 | struct udev_ctrl *ctrl; | |
90 | struct udev_ctrl_connection *ctrl_conn_blocking; | |
e3bff60a | 91 | int fd_inotify; |
e3bff60a MP |
92 | int worker_watch[2]; |
93 | ||
86f210e9 MP |
94 | sd_event_source *ctrl_event; |
95 | sd_event_source *uevent_event; | |
96 | sd_event_source *inotify_event; | |
97 | ||
98 | usec_t last_usec; | |
99 | ||
e3bff60a | 100 | bool stop_exec_queue:1; |
e3bff60a MP |
101 | bool exit:1; |
102 | } Manager; | |
663996b3 MS |
103 | |
104 | enum event_state { | |
105 | EVENT_UNDEF, | |
106 | EVENT_QUEUED, | |
107 | EVENT_RUNNING, | |
108 | }; | |
109 | ||
110 | struct event { | |
111 | struct udev_list_node node; | |
e3bff60a | 112 | Manager *manager; |
663996b3 MS |
113 | struct udev *udev; |
114 | struct udev_device *dev; | |
e3bff60a MP |
115 | struct udev_device *dev_kernel; |
116 | struct worker *worker; | |
663996b3 | 117 | enum event_state state; |
663996b3 MS |
118 | unsigned long long int delaying_seqnum; |
119 | unsigned long long int seqnum; | |
120 | const char *devpath; | |
121 | size_t devpath_len; | |
122 | const char *devpath_old; | |
123 | dev_t devnum; | |
124 | int ifindex; | |
125 | bool is_block; | |
86f210e9 MP |
126 | sd_event_source *timeout_warning; |
127 | sd_event_source *timeout; | |
663996b3 MS |
128 | }; |
129 | ||
5eef597e | 130 | static inline struct event *node_to_event(struct udev_list_node *node) { |
663996b3 MS |
131 | return container_of(node, struct event, node); |
132 | } | |
133 | ||
e3bff60a | 134 | static void event_queue_cleanup(Manager *manager, enum event_state type); |
663996b3 MS |
135 | |
136 | enum worker_state { | |
137 | WORKER_UNDEF, | |
138 | WORKER_RUNNING, | |
139 | WORKER_IDLE, | |
140 | WORKER_KILLED, | |
141 | }; | |
142 | ||
143 | struct worker { | |
e3bff60a | 144 | Manager *manager; |
663996b3 | 145 | struct udev_list_node node; |
663996b3 MS |
146 | int refcount; |
147 | pid_t pid; | |
148 | struct udev_monitor *monitor; | |
149 | enum worker_state state; | |
150 | struct event *event; | |
663996b3 MS |
151 | }; |
152 | ||
153 | /* passed from worker to main process */ | |
154 | struct worker_message { | |
663996b3 MS |
155 | }; |
156 | ||
e3bff60a MP |
157 | static void event_free(struct event *event) { |
158 | int r; | |
159 | ||
160 | if (!event) | |
161 | return; | |
663996b3 | 162 | |
663996b3 | 163 | udev_list_node_remove(&event->node); |
663996b3 | 164 | udev_device_unref(event->dev); |
e3bff60a MP |
165 | udev_device_unref(event->dev_kernel); |
166 | ||
86f210e9 MP |
167 | sd_event_source_unref(event->timeout_warning); |
168 | sd_event_source_unref(event->timeout); | |
169 | ||
e3bff60a MP |
170 | if (event->worker) |
171 | event->worker->event = NULL; | |
172 | ||
173 | assert(event->manager); | |
174 | ||
175 | if (udev_list_node_is_empty(&event->manager->events)) { | |
176 | /* only clean up the queue from the process that created it */ | |
177 | if (event->manager->pid == getpid()) { | |
178 | r = unlink("/run/udev/queue"); | |
179 | if (r < 0) | |
180 | log_warning_errno(errno, "could not unlink /run/udev/queue: %m"); | |
181 | } | |
182 | } | |
183 | ||
663996b3 MS |
184 | free(event); |
185 | } | |
186 | ||
e3bff60a MP |
187 | static void worker_free(struct worker *worker) { |
188 | if (!worker) | |
189 | return; | |
663996b3 | 190 | |
e3bff60a MP |
191 | assert(worker->manager); |
192 | ||
db2df898 | 193 | hashmap_remove(worker->manager->workers, PID_TO_PTR(worker->pid)); |
663996b3 | 194 | udev_monitor_unref(worker->monitor); |
e3bff60a MP |
195 | event_free(worker->event); |
196 | ||
663996b3 MS |
197 | free(worker); |
198 | } | |
199 | ||
e3bff60a MP |
200 | static void manager_workers_free(Manager *manager) { |
201 | struct worker *worker; | |
202 | Iterator i; | |
203 | ||
204 | assert(manager); | |
205 | ||
206 | HASHMAP_FOREACH(worker, manager->workers, i) | |
207 | worker_free(worker); | |
208 | ||
209 | manager->workers = hashmap_free(manager->workers); | |
210 | } | |
211 | ||
212 | static int worker_new(struct worker **ret, Manager *manager, struct udev_monitor *worker_monitor, pid_t pid) { | |
213 | _cleanup_free_ struct worker *worker = NULL; | |
214 | int r; | |
215 | ||
216 | assert(ret); | |
217 | assert(manager); | |
218 | assert(worker_monitor); | |
219 | assert(pid > 1); | |
220 | ||
221 | worker = new0(struct worker, 1); | |
222 | if (!worker) | |
223 | return -ENOMEM; | |
224 | ||
225 | worker->refcount = 1; | |
226 | worker->manager = manager; | |
227 | /* close monitor, but keep address around */ | |
228 | udev_monitor_disconnect(worker_monitor); | |
229 | worker->monitor = udev_monitor_ref(worker_monitor); | |
230 | worker->pid = pid; | |
231 | ||
232 | r = hashmap_ensure_allocated(&manager->workers, NULL); | |
233 | if (r < 0) | |
234 | return r; | |
235 | ||
db2df898 | 236 | r = hashmap_put(manager->workers, PID_TO_PTR(pid), worker); |
e3bff60a MP |
237 | if (r < 0) |
238 | return r; | |
239 | ||
240 | *ret = worker; | |
241 | worker = NULL; | |
242 | ||
243 | return 0; | |
244 | } | |
245 | ||
246 | static int on_event_timeout(sd_event_source *s, uint64_t usec, void *userdata) { | |
247 | struct event *event = userdata; | |
248 | ||
249 | assert(event); | |
250 | assert(event->worker); | |
251 | ||
252 | kill_and_sigcont(event->worker->pid, SIGKILL); | |
253 | event->worker->state = WORKER_KILLED; | |
254 | ||
255 | log_error("seq %llu '%s' killed", udev_device_get_seqnum(event->dev), event->devpath); | |
256 | ||
257 | return 1; | |
258 | } | |
259 | ||
260 | static int on_event_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) { | |
261 | struct event *event = userdata; | |
262 | ||
263 | assert(event); | |
264 | ||
265 | log_warning("seq %llu '%s' is taking a long time", udev_device_get_seqnum(event->dev), event->devpath); | |
266 | ||
267 | return 1; | |
268 | } | |
269 | ||
270 | static void worker_attach_event(struct worker *worker, struct event *event) { | |
86f210e9 MP |
271 | sd_event *e; |
272 | uint64_t usec; | |
86f210e9 | 273 | |
e3bff60a | 274 | assert(worker); |
86f210e9 | 275 | assert(worker->manager); |
e3bff60a MP |
276 | assert(event); |
277 | assert(!event->worker); | |
278 | assert(!worker->event); | |
279 | ||
280 | worker->state = WORKER_RUNNING; | |
281 | worker->event = event; | |
282 | event->state = EVENT_RUNNING; | |
e3bff60a | 283 | event->worker = worker; |
86f210e9 MP |
284 | |
285 | e = worker->manager->event; | |
286 | ||
13d276d0 | 287 | assert_se(sd_event_now(e, clock_boottime_or_monotonic(), &usec) >= 0); |
86f210e9 MP |
288 | |
289 | (void) sd_event_add_time(e, &event->timeout_warning, clock_boottime_or_monotonic(), | |
290 | usec + arg_event_timeout_warn_usec, USEC_PER_SEC, on_event_timeout_warning, event); | |
291 | ||
292 | (void) sd_event_add_time(e, &event->timeout, clock_boottime_or_monotonic(), | |
293 | usec + arg_event_timeout_usec, USEC_PER_SEC, on_event_timeout, event); | |
e3bff60a MP |
294 | } |
295 | ||
296 | static void manager_free(Manager *manager) { | |
297 | if (!manager) | |
663996b3 | 298 | return; |
e3bff60a MP |
299 | |
300 | udev_builtin_exit(manager->udev); | |
301 | ||
86f210e9 MP |
302 | sd_event_source_unref(manager->ctrl_event); |
303 | sd_event_source_unref(manager->uevent_event); | |
304 | sd_event_source_unref(manager->inotify_event); | |
305 | ||
e3bff60a | 306 | udev_unref(manager->udev); |
86f210e9 | 307 | sd_event_unref(manager->event); |
e3bff60a MP |
308 | manager_workers_free(manager); |
309 | event_queue_cleanup(manager, EVENT_UNDEF); | |
310 | ||
311 | udev_monitor_unref(manager->monitor); | |
312 | udev_ctrl_unref(manager->ctrl); | |
313 | udev_ctrl_connection_unref(manager->ctrl_conn_blocking); | |
314 | ||
315 | udev_list_cleanup(&manager->properties); | |
316 | udev_rules_unref(manager->rules); | |
e3bff60a | 317 | |
e3bff60a MP |
318 | safe_close(manager->fd_inotify); |
319 | safe_close_pair(manager->worker_watch); | |
320 | ||
321 | free(manager); | |
663996b3 MS |
322 | } |
323 | ||
e3bff60a | 324 | DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_free); |
663996b3 | 325 | |
e3bff60a MP |
326 | static int worker_send_message(int fd) { |
327 | struct worker_message message = {}; | |
663996b3 | 328 | |
e3bff60a | 329 | return loop_write(fd, &message, sizeof(message), false); |
663996b3 MS |
330 | } |
331 | ||
e3bff60a | 332 | static void worker_spawn(Manager *manager, struct event *event) { |
663996b3 | 333 | struct udev *udev = event->udev; |
e3bff60a | 334 | _cleanup_udev_monitor_unref_ struct udev_monitor *worker_monitor = NULL; |
663996b3 | 335 | pid_t pid; |
fb183854 | 336 | int r = 0; |
663996b3 MS |
337 | |
338 | /* listen for new events */ | |
339 | worker_monitor = udev_monitor_new_from_netlink(udev, NULL); | |
340 | if (worker_monitor == NULL) | |
341 | return; | |
342 | /* allow the main daemon netlink address to send devices to the worker */ | |
e3bff60a | 343 | udev_monitor_allow_unicast_sender(worker_monitor, manager->monitor); |
fb183854 MP |
344 | r = udev_monitor_enable_receiving(worker_monitor); |
345 | if (r < 0) | |
346 | log_error_errno(r, "worker: could not enable receiving of device: %m"); | |
663996b3 | 347 | |
663996b3 MS |
348 | pid = fork(); |
349 | switch (pid) { | |
350 | case 0: { | |
351 | struct udev_device *dev = NULL; | |
4c89c718 | 352 | _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; |
663996b3 | 353 | int fd_monitor; |
e3bff60a | 354 | _cleanup_close_ int fd_signal = -1, fd_ep = -1; |
86f210e9 MP |
355 | struct epoll_event ep_signal = { .events = EPOLLIN }; |
356 | struct epoll_event ep_monitor = { .events = EPOLLIN }; | |
663996b3 | 357 | sigset_t mask; |
663996b3 MS |
358 | |
359 | /* take initial device from queue */ | |
360 | dev = event->dev; | |
361 | event->dev = NULL; | |
362 | ||
86f210e9 MP |
363 | unsetenv("NOTIFY_SOCKET"); |
364 | ||
e3bff60a MP |
365 | manager_workers_free(manager); |
366 | event_queue_cleanup(manager, EVENT_UNDEF); | |
86f210e9 | 367 | |
e3bff60a | 368 | manager->monitor = udev_monitor_unref(manager->monitor); |
86f210e9 | 369 | manager->ctrl_conn_blocking = udev_ctrl_connection_unref(manager->ctrl_conn_blocking); |
e3bff60a | 370 | manager->ctrl = udev_ctrl_unref(manager->ctrl); |
e3bff60a | 371 | manager->worker_watch[READ_END] = safe_close(manager->worker_watch[READ_END]); |
86f210e9 MP |
372 | |
373 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); | |
374 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
375 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
376 | ||
377 | manager->event = sd_event_unref(manager->event); | |
663996b3 MS |
378 | |
379 | sigfillset(&mask); | |
380 | fd_signal = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC); | |
381 | if (fd_signal < 0) { | |
e3bff60a | 382 | r = log_error_errno(errno, "error creating signalfd %m"); |
663996b3 MS |
383 | goto out; |
384 | } | |
86f210e9 MP |
385 | ep_signal.data.fd = fd_signal; |
386 | ||
387 | fd_monitor = udev_monitor_get_fd(worker_monitor); | |
388 | ep_monitor.data.fd = fd_monitor; | |
663996b3 MS |
389 | |
390 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
391 | if (fd_ep < 0) { | |
e3bff60a | 392 | r = log_error_errno(errno, "error creating epoll fd: %m"); |
663996b3 MS |
393 | goto out; |
394 | } | |
395 | ||
663996b3 MS |
396 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_signal, &ep_signal) < 0 || |
397 | epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_monitor, &ep_monitor) < 0) { | |
e3bff60a | 398 | r = log_error_errno(errno, "fail to add fds to epoll: %m"); |
663996b3 MS |
399 | goto out; |
400 | } | |
401 | ||
aa27b158 MP |
402 | /* Request TERM signal if parent exits. |
403 | Ignore error, not much we can do in that case. */ | |
404 | (void) prctl(PR_SET_PDEATHSIG, SIGTERM); | |
663996b3 | 405 | |
aa27b158 | 406 | /* Reset OOM score, we only protect the main daemon. */ |
7035cd9e | 407 | write_string_file("/proc/self/oom_score_adj", "0", 0); |
663996b3 MS |
408 | |
409 | for (;;) { | |
410 | struct udev_event *udev_event; | |
60f067b4 | 411 | int fd_lock = -1; |
663996b3 | 412 | |
86f210e9 MP |
413 | assert(dev); |
414 | ||
60f067b4 | 415 | log_debug("seq %llu running", udev_device_get_seqnum(dev)); |
663996b3 MS |
416 | udev_event = udev_event_new(dev); |
417 | if (udev_event == NULL) { | |
e3bff60a | 418 | r = -ENOMEM; |
663996b3 MS |
419 | goto out; |
420 | } | |
421 | ||
5eef597e MP |
422 | if (arg_exec_delay > 0) |
423 | udev_event->exec_delay = arg_exec_delay; | |
663996b3 | 424 | |
60f067b4 | 425 | /* |
5eef597e | 426 | * Take a shared lock on the device node; this establishes |
60f067b4 | 427 | * a concept of device "ownership" to serialize device |
5eef597e | 428 | * access. External processes holding an exclusive lock will |
60f067b4 | 429 | * cause udev to skip the event handling; in the case udev |
5eef597e | 430 | * acquired the lock, the external process can block until |
60f067b4 JS |
431 | * udev has finished its event handling. |
432 | */ | |
5eef597e MP |
433 | if (!streq_ptr(udev_device_get_action(dev), "remove") && |
434 | streq_ptr("block", udev_device_get_subsystem(dev)) && | |
435 | !startswith(udev_device_get_sysname(dev), "dm-") && | |
436 | !startswith(udev_device_get_sysname(dev), "md")) { | |
60f067b4 JS |
437 | struct udev_device *d = dev; |
438 | ||
439 | if (streq_ptr("partition", udev_device_get_devtype(d))) | |
440 | d = udev_device_get_parent(d); | |
441 | ||
442 | if (d) { | |
443 | fd_lock = open(udev_device_get_devnode(d), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
444 | if (fd_lock >= 0 && flock(fd_lock, LOCK_SH|LOCK_NB) < 0) { | |
f47781d8 | 445 | log_debug_errno(errno, "Unable to flock(%s), skipping event handling: %m", udev_device_get_devnode(d)); |
60f067b4 JS |
446 | fd_lock = safe_close(fd_lock); |
447 | goto skip; | |
448 | } | |
449 | } | |
450 | } | |
451 | ||
5eef597e MP |
452 | /* needed for renaming netifs */ |
453 | udev_event->rtnl = rtnl; | |
454 | ||
663996b3 | 455 | /* apply rules, create node, symlinks */ |
f47781d8 MP |
456 | udev_event_execute_rules(udev_event, |
457 | arg_event_timeout_usec, arg_event_timeout_warn_usec, | |
e3bff60a | 458 | &manager->properties, |
86f210e9 | 459 | manager->rules); |
5eef597e | 460 | |
f47781d8 | 461 | udev_event_execute_run(udev_event, |
86f210e9 | 462 | arg_event_timeout_usec, arg_event_timeout_warn_usec); |
663996b3 | 463 | |
f47781d8 MP |
464 | if (udev_event->rtnl) |
465 | /* in case rtnl was initialized */ | |
86f210e9 | 466 | rtnl = sd_netlink_ref(udev_event->rtnl); |
663996b3 MS |
467 | |
468 | /* apply/restore inotify watch */ | |
60f067b4 | 469 | if (udev_event->inotify_watch) { |
663996b3 MS |
470 | udev_watch_begin(udev, dev); |
471 | udev_device_update_db(dev); | |
472 | } | |
473 | ||
60f067b4 JS |
474 | safe_close(fd_lock); |
475 | ||
663996b3 MS |
476 | /* send processed event back to libudev listeners */ |
477 | udev_monitor_send_device(worker_monitor, NULL, dev); | |
478 | ||
60f067b4 | 479 | skip: |
e3bff60a | 480 | log_debug("seq %llu processed", udev_device_get_seqnum(dev)); |
663996b3 | 481 | |
e3bff60a MP |
482 | /* send udevd the result of the event execution */ |
483 | r = worker_send_message(manager->worker_watch[WRITE_END]); | |
484 | if (r < 0) | |
485 | log_error_errno(r, "failed to send result of seq %llu to main daemon: %m", | |
486 | udev_device_get_seqnum(dev)); | |
663996b3 MS |
487 | |
488 | udev_device_unref(dev); | |
489 | dev = NULL; | |
490 | ||
663996b3 MS |
491 | udev_event_unref(udev_event); |
492 | ||
493 | /* wait for more device messages from main udevd, or term signal */ | |
494 | while (dev == NULL) { | |
495 | struct epoll_event ev[4]; | |
496 | int fdcount; | |
497 | int i; | |
498 | ||
499 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), -1); | |
500 | if (fdcount < 0) { | |
501 | if (errno == EINTR) | |
502 | continue; | |
e3bff60a | 503 | r = log_error_errno(errno, "failed to poll: %m"); |
663996b3 MS |
504 | goto out; |
505 | } | |
506 | ||
507 | for (i = 0; i < fdcount; i++) { | |
508 | if (ev[i].data.fd == fd_monitor && ev[i].events & EPOLLIN) { | |
509 | dev = udev_monitor_receive_device(worker_monitor); | |
510 | break; | |
511 | } else if (ev[i].data.fd == fd_signal && ev[i].events & EPOLLIN) { | |
512 | struct signalfd_siginfo fdsi; | |
513 | ssize_t size; | |
514 | ||
515 | size = read(fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
516 | if (size != sizeof(struct signalfd_siginfo)) | |
517 | continue; | |
518 | switch (fdsi.ssi_signo) { | |
519 | case SIGTERM: | |
520 | goto out; | |
521 | } | |
522 | } | |
523 | } | |
524 | } | |
525 | } | |
526 | out: | |
527 | udev_device_unref(dev); | |
e3bff60a | 528 | manager_free(manager); |
663996b3 | 529 | log_close(); |
e3bff60a | 530 | _exit(r < 0 ? EXIT_FAILURE : EXIT_SUCCESS); |
663996b3 MS |
531 | } |
532 | case -1: | |
663996b3 | 533 | event->state = EVENT_QUEUED; |
f47781d8 | 534 | log_error_errno(errno, "fork of child failed: %m"); |
663996b3 MS |
535 | break; |
536 | default: | |
e3bff60a MP |
537 | { |
538 | struct worker *worker; | |
e3bff60a MP |
539 | |
540 | r = worker_new(&worker, manager, worker_monitor, pid); | |
541 | if (r < 0) | |
542 | return; | |
543 | ||
544 | worker_attach_event(worker, event); | |
545 | ||
e735f4d4 | 546 | log_debug("seq %llu forked new worker ["PID_FMT"]", udev_device_get_seqnum(event->dev), pid); |
663996b3 MS |
547 | break; |
548 | } | |
e3bff60a | 549 | } |
663996b3 MS |
550 | } |
551 | ||
e3bff60a MP |
552 | static void event_run(Manager *manager, struct event *event) { |
553 | struct worker *worker; | |
554 | Iterator i; | |
555 | ||
556 | assert(manager); | |
557 | assert(event); | |
663996b3 | 558 | |
e3bff60a | 559 | HASHMAP_FOREACH(worker, manager->workers, i) { |
663996b3 MS |
560 | ssize_t count; |
561 | ||
562 | if (worker->state != WORKER_IDLE) | |
563 | continue; | |
564 | ||
e3bff60a | 565 | count = udev_monitor_send_device(manager->monitor, worker->monitor, event->dev); |
663996b3 | 566 | if (count < 0) { |
e735f4d4 MP |
567 | log_error_errno(errno, "worker ["PID_FMT"] did not accept message %zi (%m), kill it", |
568 | worker->pid, count); | |
663996b3 MS |
569 | kill(worker->pid, SIGKILL); |
570 | worker->state = WORKER_KILLED; | |
571 | continue; | |
572 | } | |
e3bff60a | 573 | worker_attach_event(worker, event); |
663996b3 MS |
574 | return; |
575 | } | |
576 | ||
e3bff60a | 577 | if (hashmap_size(manager->workers) >= arg_children_max) { |
5eef597e | 578 | if (arg_children_max > 1) |
e3bff60a | 579 | log_debug("maximum number (%i) of children reached", hashmap_size(manager->workers)); |
663996b3 MS |
580 | return; |
581 | } | |
582 | ||
583 | /* start new worker and pass initial device */ | |
e3bff60a | 584 | worker_spawn(manager, event); |
663996b3 MS |
585 | } |
586 | ||
e3bff60a | 587 | static int event_queue_insert(Manager *manager, struct udev_device *dev) { |
663996b3 | 588 | struct event *event; |
e3bff60a MP |
589 | int r; |
590 | ||
591 | assert(manager); | |
592 | assert(dev); | |
593 | ||
86f210e9 MP |
594 | /* only one process can add events to the queue */ |
595 | if (manager->pid == 0) | |
596 | manager->pid = getpid(); | |
597 | ||
e3bff60a | 598 | assert(manager->pid == getpid()); |
663996b3 | 599 | |
60f067b4 | 600 | event = new0(struct event, 1); |
e3bff60a MP |
601 | if (!event) |
602 | return -ENOMEM; | |
663996b3 MS |
603 | |
604 | event->udev = udev_device_get_udev(dev); | |
e3bff60a | 605 | event->manager = manager; |
663996b3 | 606 | event->dev = dev; |
e3bff60a MP |
607 | event->dev_kernel = udev_device_shallow_clone(dev); |
608 | udev_device_copy_properties(event->dev_kernel, dev); | |
663996b3 MS |
609 | event->seqnum = udev_device_get_seqnum(dev); |
610 | event->devpath = udev_device_get_devpath(dev); | |
611 | event->devpath_len = strlen(event->devpath); | |
612 | event->devpath_old = udev_device_get_devpath_old(dev); | |
613 | event->devnum = udev_device_get_devnum(dev); | |
614 | event->is_block = streq("block", udev_device_get_subsystem(dev)); | |
615 | event->ifindex = udev_device_get_ifindex(dev); | |
663996b3 | 616 | |
60f067b4 | 617 | log_debug("seq %llu queued, '%s' '%s'", udev_device_get_seqnum(dev), |
663996b3 MS |
618 | udev_device_get_action(dev), udev_device_get_subsystem(dev)); |
619 | ||
620 | event->state = EVENT_QUEUED; | |
e3bff60a MP |
621 | |
622 | if (udev_list_node_is_empty(&manager->events)) { | |
623 | r = touch("/run/udev/queue"); | |
624 | if (r < 0) | |
625 | log_warning_errno(r, "could not touch /run/udev/queue: %m"); | |
626 | } | |
627 | ||
628 | udev_list_node_append(&event->node, &manager->events); | |
629 | ||
663996b3 MS |
630 | return 0; |
631 | } | |
632 | ||
e3bff60a MP |
633 | static void manager_kill_workers(Manager *manager) { |
634 | struct worker *worker; | |
635 | Iterator i; | |
663996b3 | 636 | |
e3bff60a | 637 | assert(manager); |
663996b3 | 638 | |
e3bff60a | 639 | HASHMAP_FOREACH(worker, manager->workers, i) { |
663996b3 MS |
640 | if (worker->state == WORKER_KILLED) |
641 | continue; | |
642 | ||
643 | worker->state = WORKER_KILLED; | |
644 | kill(worker->pid, SIGTERM); | |
645 | } | |
646 | } | |
647 | ||
648 | /* lookup event for identical, parent, child device */ | |
e3bff60a | 649 | static bool is_devpath_busy(Manager *manager, struct event *event) { |
663996b3 MS |
650 | struct udev_list_node *loop; |
651 | size_t common; | |
652 | ||
653 | /* check if queue contains events we depend on */ | |
e3bff60a | 654 | udev_list_node_foreach(loop, &manager->events) { |
663996b3 MS |
655 | struct event *loop_event = node_to_event(loop); |
656 | ||
657 | /* we already found a later event, earlier can not block us, no need to check again */ | |
658 | if (loop_event->seqnum < event->delaying_seqnum) | |
659 | continue; | |
660 | ||
661 | /* event we checked earlier still exists, no need to check again */ | |
662 | if (loop_event->seqnum == event->delaying_seqnum) | |
663 | return true; | |
664 | ||
665 | /* found ourself, no later event can block us */ | |
666 | if (loop_event->seqnum >= event->seqnum) | |
667 | break; | |
668 | ||
669 | /* check major/minor */ | |
670 | if (major(event->devnum) != 0 && event->devnum == loop_event->devnum && event->is_block == loop_event->is_block) | |
671 | return true; | |
672 | ||
673 | /* check network device ifindex */ | |
674 | if (event->ifindex != 0 && event->ifindex == loop_event->ifindex) | |
675 | return true; | |
676 | ||
677 | /* check our old name */ | |
678 | if (event->devpath_old != NULL && streq(loop_event->devpath, event->devpath_old)) { | |
679 | event->delaying_seqnum = loop_event->seqnum; | |
680 | return true; | |
681 | } | |
682 | ||
683 | /* compare devpath */ | |
684 | common = MIN(loop_event->devpath_len, event->devpath_len); | |
685 | ||
686 | /* one devpath is contained in the other? */ | |
687 | if (memcmp(loop_event->devpath, event->devpath, common) != 0) | |
688 | continue; | |
689 | ||
690 | /* identical device event found */ | |
691 | if (loop_event->devpath_len == event->devpath_len) { | |
692 | /* devices names might have changed/swapped in the meantime */ | |
693 | if (major(event->devnum) != 0 && (event->devnum != loop_event->devnum || event->is_block != loop_event->is_block)) | |
694 | continue; | |
695 | if (event->ifindex != 0 && event->ifindex != loop_event->ifindex) | |
696 | continue; | |
697 | event->delaying_seqnum = loop_event->seqnum; | |
698 | return true; | |
699 | } | |
700 | ||
663996b3 MS |
701 | /* parent device event found */ |
702 | if (event->devpath[common] == '/') { | |
703 | event->delaying_seqnum = loop_event->seqnum; | |
704 | return true; | |
705 | } | |
706 | ||
707 | /* child device event found */ | |
708 | if (loop_event->devpath[common] == '/') { | |
709 | event->delaying_seqnum = loop_event->seqnum; | |
710 | return true; | |
711 | } | |
712 | ||
713 | /* no matching device */ | |
714 | continue; | |
715 | } | |
716 | ||
717 | return false; | |
718 | } | |
719 | ||
86f210e9 MP |
720 | static int on_exit_timeout(sd_event_source *s, uint64_t usec, void *userdata) { |
721 | Manager *manager = userdata; | |
722 | ||
723 | assert(manager); | |
724 | ||
725 | log_error_errno(ETIMEDOUT, "giving up waiting for workers to finish"); | |
726 | ||
727 | sd_event_exit(manager->event, -ETIMEDOUT); | |
728 | ||
729 | return 1; | |
730 | } | |
731 | ||
732 | static void manager_exit(Manager *manager) { | |
733 | uint64_t usec; | |
734 | int r; | |
735 | ||
736 | assert(manager); | |
737 | ||
738 | manager->exit = true; | |
739 | ||
740 | sd_notify(false, | |
741 | "STOPPING=1\n" | |
742 | "STATUS=Starting shutdown..."); | |
743 | ||
744 | /* close sources of new events and discard buffered events */ | |
745 | manager->ctrl_event = sd_event_source_unref(manager->ctrl_event); | |
746 | manager->ctrl = udev_ctrl_unref(manager->ctrl); | |
747 | ||
748 | manager->inotify_event = sd_event_source_unref(manager->inotify_event); | |
749 | manager->fd_inotify = safe_close(manager->fd_inotify); | |
750 | ||
751 | manager->uevent_event = sd_event_source_unref(manager->uevent_event); | |
752 | manager->monitor = udev_monitor_unref(manager->monitor); | |
753 | ||
754 | /* discard queued events and kill workers */ | |
755 | event_queue_cleanup(manager, EVENT_QUEUED); | |
756 | manager_kill_workers(manager); | |
757 | ||
13d276d0 | 758 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
86f210e9 MP |
759 | |
760 | r = sd_event_add_time(manager->event, NULL, clock_boottime_or_monotonic(), | |
761 | usec + 30 * USEC_PER_SEC, USEC_PER_SEC, on_exit_timeout, manager); | |
762 | if (r < 0) | |
763 | return; | |
764 | } | |
765 | ||
766 | /* reload requested, HUP signal received, rules changed, builtin changed */ | |
767 | static void manager_reload(Manager *manager) { | |
768 | ||
769 | assert(manager); | |
770 | ||
771 | sd_notify(false, | |
772 | "RELOADING=1\n" | |
773 | "STATUS=Flushing configuration..."); | |
774 | ||
775 | manager_kill_workers(manager); | |
776 | manager->rules = udev_rules_unref(manager->rules); | |
777 | udev_builtin_exit(manager->udev); | |
778 | ||
779 | sd_notify(false, | |
780 | "READY=1\n" | |
781 | "STATUS=Processing..."); | |
782 | } | |
783 | ||
e3bff60a | 784 | static void event_queue_start(Manager *manager) { |
663996b3 | 785 | struct udev_list_node *loop; |
86f210e9 | 786 | usec_t usec; |
663996b3 | 787 | |
e3bff60a MP |
788 | assert(manager); |
789 | ||
86f210e9 MP |
790 | if (udev_list_node_is_empty(&manager->events) || |
791 | manager->exit || manager->stop_exec_queue) | |
792 | return; | |
793 | ||
13d276d0 MP |
794 | assert_se(sd_event_now(manager->event, clock_boottime_or_monotonic(), &usec) >= 0); |
795 | /* check for changed config, every 3 seconds at most */ | |
796 | if (manager->last_usec == 0 || | |
797 | (usec - manager->last_usec) > 3 * USEC_PER_SEC) { | |
798 | if (udev_rules_check_timestamp(manager->rules) || | |
799 | udev_builtin_validate(manager->udev)) | |
800 | manager_reload(manager); | |
86f210e9 | 801 | |
13d276d0 | 802 | manager->last_usec = usec; |
86f210e9 MP |
803 | } |
804 | ||
805 | udev_builtin_init(manager->udev); | |
806 | ||
807 | if (!manager->rules) { | |
808 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
809 | if (!manager->rules) | |
810 | return; | |
811 | } | |
812 | ||
e3bff60a | 813 | udev_list_node_foreach(loop, &manager->events) { |
663996b3 MS |
814 | struct event *event = node_to_event(loop); |
815 | ||
816 | if (event->state != EVENT_QUEUED) | |
817 | continue; | |
818 | ||
819 | /* do not start event if parent or child event is still running */ | |
e3bff60a | 820 | if (is_devpath_busy(manager, event)) |
663996b3 MS |
821 | continue; |
822 | ||
e3bff60a | 823 | event_run(manager, event); |
663996b3 MS |
824 | } |
825 | } | |
826 | ||
e3bff60a | 827 | static void event_queue_cleanup(Manager *manager, enum event_state match_type) { |
663996b3 MS |
828 | struct udev_list_node *loop, *tmp; |
829 | ||
e3bff60a | 830 | udev_list_node_foreach_safe(loop, tmp, &manager->events) { |
663996b3 MS |
831 | struct event *event = node_to_event(loop); |
832 | ||
833 | if (match_type != EVENT_UNDEF && match_type != event->state) | |
834 | continue; | |
835 | ||
e3bff60a | 836 | event_free(event); |
663996b3 MS |
837 | } |
838 | } | |
839 | ||
e3bff60a MP |
840 | static int on_worker(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
841 | Manager *manager = userdata; | |
842 | ||
843 | assert(manager); | |
844 | ||
663996b3 MS |
845 | for (;;) { |
846 | struct worker_message msg; | |
e3bff60a MP |
847 | struct iovec iovec = { |
848 | .iov_base = &msg, | |
849 | .iov_len = sizeof(msg), | |
850 | }; | |
851 | union { | |
852 | struct cmsghdr cmsghdr; | |
853 | uint8_t buf[CMSG_SPACE(sizeof(struct ucred))]; | |
854 | } control = {}; | |
855 | struct msghdr msghdr = { | |
856 | .msg_iov = &iovec, | |
857 | .msg_iovlen = 1, | |
858 | .msg_control = &control, | |
859 | .msg_controllen = sizeof(control), | |
860 | }; | |
861 | struct cmsghdr *cmsg; | |
663996b3 | 862 | ssize_t size; |
e3bff60a MP |
863 | struct ucred *ucred = NULL; |
864 | struct worker *worker; | |
663996b3 | 865 | |
e3bff60a MP |
866 | size = recvmsg(fd, &msghdr, MSG_DONTWAIT); |
867 | if (size < 0) { | |
868 | if (errno == EINTR) | |
869 | continue; | |
870 | else if (errno == EAGAIN) | |
871 | /* nothing more to read */ | |
872 | break; | |
663996b3 | 873 | |
e3bff60a MP |
874 | return log_error_errno(errno, "failed to receive message: %m"); |
875 | } else if (size != sizeof(struct worker_message)) { | |
876 | log_warning_errno(EIO, "ignoring worker message with invalid size %zi bytes", size); | |
877 | continue; | |
878 | } | |
663996b3 | 879 | |
86f210e9 | 880 | CMSG_FOREACH(cmsg, &msghdr) { |
e3bff60a MP |
881 | if (cmsg->cmsg_level == SOL_SOCKET && |
882 | cmsg->cmsg_type == SCM_CREDENTIALS && | |
883 | cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) | |
884 | ucred = (struct ucred*) CMSG_DATA(cmsg); | |
885 | } | |
663996b3 | 886 | |
e3bff60a MP |
887 | if (!ucred || ucred->pid <= 0) { |
888 | log_warning_errno(EIO, "ignoring worker message without valid PID"); | |
889 | continue; | |
663996b3 | 890 | } |
e3bff60a MP |
891 | |
892 | /* lookup worker who sent the signal */ | |
db2df898 | 893 | worker = hashmap_get(manager->workers, PID_TO_PTR(ucred->pid)); |
e3bff60a MP |
894 | if (!worker) { |
895 | log_debug("worker ["PID_FMT"] returned, but is no longer tracked", ucred->pid); | |
896 | continue; | |
897 | } | |
898 | ||
899 | if (worker->state != WORKER_KILLED) | |
900 | worker->state = WORKER_IDLE; | |
901 | ||
902 | /* worker returned */ | |
903 | event_free(worker->event); | |
663996b3 | 904 | } |
e3bff60a | 905 | |
86f210e9 MP |
906 | /* we have free workers, try to schedule events */ |
907 | event_queue_start(manager); | |
908 | ||
e3bff60a MP |
909 | return 1; |
910 | } | |
911 | ||
912 | static int on_uevent(sd_event_source *s, int fd, uint32_t revents, void *userdata) { | |
913 | Manager *manager = userdata; | |
914 | struct udev_device *dev; | |
915 | int r; | |
916 | ||
917 | assert(manager); | |
918 | ||
919 | dev = udev_monitor_receive_device(manager->monitor); | |
920 | if (dev) { | |
921 | udev_device_ensure_usec_initialized(dev, NULL); | |
922 | r = event_queue_insert(manager, dev); | |
923 | if (r < 0) | |
924 | udev_device_unref(dev); | |
86f210e9 MP |
925 | else |
926 | /* we have fresh events, try to schedule them */ | |
927 | event_queue_start(manager); | |
e3bff60a MP |
928 | } |
929 | ||
930 | return 1; | |
663996b3 MS |
931 | } |
932 | ||
933 | /* receive the udevd message from userspace */ | |
e3bff60a MP |
934 | static int on_ctrl_msg(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
935 | Manager *manager = userdata; | |
936 | _cleanup_udev_ctrl_connection_unref_ struct udev_ctrl_connection *ctrl_conn = NULL; | |
937 | _cleanup_udev_ctrl_msg_unref_ struct udev_ctrl_msg *ctrl_msg = NULL; | |
663996b3 MS |
938 | const char *str; |
939 | int i; | |
940 | ||
e3bff60a MP |
941 | assert(manager); |
942 | ||
943 | ctrl_conn = udev_ctrl_get_connection(manager->ctrl); | |
944 | if (!ctrl_conn) | |
945 | return 1; | |
663996b3 MS |
946 | |
947 | ctrl_msg = udev_ctrl_receive_msg(ctrl_conn); | |
e3bff60a MP |
948 | if (!ctrl_msg) |
949 | return 1; | |
663996b3 MS |
950 | |
951 | i = udev_ctrl_get_set_log_level(ctrl_msg); | |
952 | if (i >= 0) { | |
60f067b4 | 953 | log_debug("udevd message (SET_LOG_LEVEL) received, log_priority=%i", i); |
663996b3 | 954 | log_set_max_level(i); |
e3bff60a | 955 | manager_kill_workers(manager); |
663996b3 MS |
956 | } |
957 | ||
958 | if (udev_ctrl_get_stop_exec_queue(ctrl_msg) > 0) { | |
60f067b4 | 959 | log_debug("udevd message (STOP_EXEC_QUEUE) received"); |
e3bff60a | 960 | manager->stop_exec_queue = true; |
663996b3 MS |
961 | } |
962 | ||
963 | if (udev_ctrl_get_start_exec_queue(ctrl_msg) > 0) { | |
60f067b4 | 964 | log_debug("udevd message (START_EXEC_QUEUE) received"); |
e3bff60a | 965 | manager->stop_exec_queue = false; |
86f210e9 | 966 | event_queue_start(manager); |
663996b3 MS |
967 | } |
968 | ||
969 | if (udev_ctrl_get_reload(ctrl_msg) > 0) { | |
60f067b4 | 970 | log_debug("udevd message (RELOAD) received"); |
86f210e9 | 971 | manager_reload(manager); |
663996b3 MS |
972 | } |
973 | ||
974 | str = udev_ctrl_get_set_env(ctrl_msg); | |
975 | if (str != NULL) { | |
e3bff60a | 976 | _cleanup_free_ char *key = NULL; |
663996b3 MS |
977 | |
978 | key = strdup(str); | |
e3bff60a | 979 | if (key) { |
663996b3 MS |
980 | char *val; |
981 | ||
982 | val = strchr(key, '='); | |
983 | if (val != NULL) { | |
984 | val[0] = '\0'; | |
985 | val = &val[1]; | |
986 | if (val[0] == '\0') { | |
60f067b4 | 987 | log_debug("udevd message (ENV) received, unset '%s'", key); |
e3bff60a | 988 | udev_list_entry_add(&manager->properties, key, NULL); |
663996b3 | 989 | } else { |
60f067b4 | 990 | log_debug("udevd message (ENV) received, set '%s=%s'", key, val); |
e3bff60a | 991 | udev_list_entry_add(&manager->properties, key, val); |
663996b3 | 992 | } |
e3bff60a | 993 | } else |
60f067b4 | 994 | log_error("wrong key format '%s'", key); |
663996b3 | 995 | } |
e3bff60a | 996 | manager_kill_workers(manager); |
663996b3 MS |
997 | } |
998 | ||
999 | i = udev_ctrl_get_set_children_max(ctrl_msg); | |
1000 | if (i >= 0) { | |
60f067b4 | 1001 | log_debug("udevd message (SET_MAX_CHILDREN) received, children_max=%i", i); |
5eef597e | 1002 | arg_children_max = i; |
663996b3 MS |
1003 | } |
1004 | ||
1005 | if (udev_ctrl_get_ping(ctrl_msg) > 0) | |
60f067b4 | 1006 | log_debug("udevd message (SYNC) received"); |
663996b3 MS |
1007 | |
1008 | if (udev_ctrl_get_exit(ctrl_msg) > 0) { | |
60f067b4 | 1009 | log_debug("udevd message (EXIT) received"); |
86f210e9 | 1010 | manager_exit(manager); |
e3bff60a MP |
1011 | /* keep reference to block the client until we exit |
1012 | TODO: deal with several blocking exit requests */ | |
1013 | manager->ctrl_conn_blocking = udev_ctrl_connection_ref(ctrl_conn); | |
663996b3 | 1014 | } |
e3bff60a MP |
1015 | |
1016 | return 1; | |
663996b3 MS |
1017 | } |
1018 | ||
60f067b4 JS |
1019 | static int synthesize_change(struct udev_device *dev) { |
1020 | char filename[UTIL_PATH_SIZE]; | |
1021 | int r; | |
1022 | ||
1023 | if (streq_ptr("block", udev_device_get_subsystem(dev)) && | |
1024 | streq_ptr("disk", udev_device_get_devtype(dev)) && | |
1025 | !startswith(udev_device_get_sysname(dev), "dm-")) { | |
1026 | bool part_table_read = false; | |
1027 | bool has_partitions = false; | |
1028 | int fd; | |
1029 | struct udev *udev = udev_device_get_udev(dev); | |
1030 | _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL; | |
1031 | struct udev_list_entry *item; | |
1032 | ||
1033 | /* | |
1034 | * Try to re-read the partition table. This only succeeds if | |
1035 | * none of the devices is busy. The kernel returns 0 if no | |
1036 | * partition table is found, and we will not get an event for | |
1037 | * the disk. | |
1038 | */ | |
1039 | fd = open(udev_device_get_devnode(dev), O_RDONLY|O_CLOEXEC|O_NOFOLLOW|O_NONBLOCK); | |
1040 | if (fd >= 0) { | |
1041 | r = flock(fd, LOCK_EX|LOCK_NB); | |
1042 | if (r >= 0) | |
1043 | r = ioctl(fd, BLKRRPART, 0); | |
1044 | ||
1045 | close(fd); | |
1046 | if (r >= 0) | |
1047 | part_table_read = true; | |
1048 | } | |
1049 | ||
1050 | /* search for partitions */ | |
1051 | e = udev_enumerate_new(udev); | |
1052 | if (!e) | |
1053 | return -ENOMEM; | |
1054 | ||
1055 | r = udev_enumerate_add_match_parent(e, dev); | |
1056 | if (r < 0) | |
1057 | return r; | |
1058 | ||
1059 | r = udev_enumerate_add_match_subsystem(e, "block"); | |
1060 | if (r < 0) | |
1061 | return r; | |
1062 | ||
1063 | r = udev_enumerate_scan_devices(e); | |
1064 | if (r < 0) | |
1065 | return r; | |
1066 | ||
1067 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1068 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1069 | ||
1070 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1071 | if (!d) | |
1072 | continue; | |
1073 | ||
1074 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1075 | continue; | |
1076 | ||
1077 | has_partitions = true; | |
1078 | break; | |
1079 | } | |
1080 | ||
1081 | /* | |
1082 | * We have partitions and re-read the table, the kernel already sent | |
1083 | * out a "change" event for the disk, and "remove/add" for all | |
1084 | * partitions. | |
1085 | */ | |
1086 | if (part_table_read && has_partitions) | |
1087 | return 0; | |
1088 | ||
1089 | /* | |
1090 | * We have partitions but re-reading the partition table did not | |
1091 | * work, synthesize "change" for the disk and all partitions. | |
1092 | */ | |
1093 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1094 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
7035cd9e | 1095 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
60f067b4 JS |
1096 | |
1097 | udev_list_entry_foreach(item, udev_enumerate_get_list_entry(e)) { | |
1098 | _cleanup_udev_device_unref_ struct udev_device *d = NULL; | |
1099 | ||
1100 | d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item)); | |
1101 | if (!d) | |
1102 | continue; | |
1103 | ||
1104 | if (!streq_ptr("partition", udev_device_get_devtype(d))) | |
1105 | continue; | |
1106 | ||
1107 | log_debug("device %s closed, synthesising partition '%s' 'change'", | |
1108 | udev_device_get_devnode(dev), udev_device_get_devnode(d)); | |
1109 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(d), "/uevent", NULL); | |
7035cd9e | 1110 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
60f067b4 JS |
1111 | } |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | log_debug("device %s closed, synthesising 'change'", udev_device_get_devnode(dev)); | |
1117 | strscpyl(filename, sizeof(filename), udev_device_get_syspath(dev), "/uevent", NULL); | |
7035cd9e | 1118 | write_string_file(filename, "change", WRITE_STRING_FILE_CREATE); |
60f067b4 JS |
1119 | |
1120 | return 0; | |
1121 | } | |
1122 | ||
e3bff60a MP |
1123 | static int on_inotify(sd_event_source *s, int fd, uint32_t revents, void *userdata) { |
1124 | Manager *manager = userdata; | |
e735f4d4 | 1125 | union inotify_event_buffer buffer; |
f47781d8 MP |
1126 | struct inotify_event *e; |
1127 | ssize_t l; | |
663996b3 | 1128 | |
e3bff60a MP |
1129 | assert(manager); |
1130 | ||
1131 | l = read(fd, &buffer, sizeof(buffer)); | |
f47781d8 MP |
1132 | if (l < 0) { |
1133 | if (errno == EAGAIN || errno == EINTR) | |
e3bff60a | 1134 | return 1; |
663996b3 | 1135 | |
f47781d8 | 1136 | return log_error_errno(errno, "Failed to read inotify fd: %m"); |
663996b3 MS |
1137 | } |
1138 | ||
f47781d8 | 1139 | FOREACH_INOTIFY_EVENT(e, buffer, l) { |
e3bff60a | 1140 | _cleanup_udev_device_unref_ struct udev_device *dev = NULL; |
663996b3 | 1141 | |
e3bff60a | 1142 | dev = udev_watch_lookup(manager->udev, e->wd); |
60f067b4 JS |
1143 | if (!dev) |
1144 | continue; | |
663996b3 | 1145 | |
f47781d8 | 1146 | log_debug("inotify event: %x for %s", e->mask, udev_device_get_devnode(dev)); |
e3bff60a | 1147 | if (e->mask & IN_CLOSE_WRITE) { |
60f067b4 | 1148 | synthesize_change(dev); |
663996b3 | 1149 | |
e3bff60a MP |
1150 | /* settle might be waiting on us to determine the queue |
1151 | * state. If we just handled an inotify event, we might have | |
1152 | * generated a "change" event, but we won't have queued up | |
1153 | * the resultant uevent yet. Do that. | |
1154 | */ | |
1155 | on_uevent(NULL, -1, 0, manager); | |
1156 | } else if (e->mask & IN_IGNORED) | |
1157 | udev_watch_end(manager->udev, dev); | |
663996b3 MS |
1158 | } |
1159 | ||
e3bff60a | 1160 | return 1; |
663996b3 MS |
1161 | } |
1162 | ||
e3bff60a MP |
1163 | static int on_sigterm(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1164 | Manager *manager = userdata; | |
663996b3 | 1165 | |
e3bff60a | 1166 | assert(manager); |
663996b3 | 1167 | |
86f210e9 | 1168 | manager_exit(manager); |
663996b3 | 1169 | |
e3bff60a MP |
1170 | return 1; |
1171 | } | |
663996b3 | 1172 | |
e3bff60a MP |
1173 | static int on_sighup(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { |
1174 | Manager *manager = userdata; | |
60f067b4 | 1175 | |
e3bff60a MP |
1176 | assert(manager); |
1177 | ||
86f210e9 | 1178 | manager_reload(manager); |
e3bff60a MP |
1179 | |
1180 | return 1; | |
1181 | } | |
1182 | ||
1183 | static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) { | |
1184 | Manager *manager = userdata; | |
1185 | ||
1186 | assert(manager); | |
1187 | ||
1188 | for (;;) { | |
1189 | pid_t pid; | |
1190 | int status; | |
1191 | struct worker *worker; | |
1192 | ||
1193 | pid = waitpid(-1, &status, WNOHANG); | |
1194 | if (pid <= 0) | |
1195 | break; | |
1196 | ||
db2df898 | 1197 | worker = hashmap_get(manager->workers, PID_TO_PTR(pid)); |
e3bff60a MP |
1198 | if (!worker) { |
1199 | log_warning("worker ["PID_FMT"] is unknown, ignoring", pid); | |
1200 | continue; | |
1201 | } | |
1202 | ||
1203 | if (WIFEXITED(status)) { | |
1204 | if (WEXITSTATUS(status) == 0) | |
1205 | log_debug("worker ["PID_FMT"] exited", pid); | |
1206 | else | |
1207 | log_warning("worker ["PID_FMT"] exited with return code %i", pid, WEXITSTATUS(status)); | |
1208 | } else if (WIFSIGNALED(status)) { | |
1209 | log_warning("worker ["PID_FMT"] terminated by signal %i (%s)", pid, WTERMSIG(status), strsignal(WTERMSIG(status))); | |
1210 | } else if (WIFSTOPPED(status)) { | |
1211 | log_info("worker ["PID_FMT"] stopped", pid); | |
1212 | continue; | |
1213 | } else if (WIFCONTINUED(status)) { | |
1214 | log_info("worker ["PID_FMT"] continued", pid); | |
1215 | continue; | |
1216 | } else | |
1217 | log_warning("worker ["PID_FMT"] exit with status 0x%04x", pid, status); | |
1218 | ||
1219 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { | |
1220 | if (worker->event) { | |
1221 | log_error("worker ["PID_FMT"] failed while handling '%s'", pid, worker->event->devpath); | |
1222 | /* delete state from disk */ | |
1223 | udev_device_delete_db(worker->event->dev); | |
1224 | udev_device_tag_index(worker->event->dev, NULL, false); | |
1225 | /* forward kernel event without amending it */ | |
1226 | udev_monitor_send_device(manager->monitor, NULL, worker->event->dev_kernel); | |
663996b3 MS |
1227 | } |
1228 | } | |
e3bff60a MP |
1229 | |
1230 | worker_free(worker); | |
663996b3 | 1231 | } |
e3bff60a | 1232 | |
86f210e9 MP |
1233 | /* we can start new workers, try to schedule events */ |
1234 | event_queue_start(manager); | |
1235 | ||
1236 | return 1; | |
1237 | } | |
1238 | ||
1239 | static int on_post(sd_event_source *s, void *userdata) { | |
1240 | Manager *manager = userdata; | |
1241 | int r; | |
1242 | ||
1243 | assert(manager); | |
1244 | ||
1245 | if (udev_list_node_is_empty(&manager->events)) { | |
1246 | /* no pending events */ | |
1247 | if (!hashmap_isempty(manager->workers)) { | |
1248 | /* there are idle workers */ | |
1249 | log_debug("cleanup idle workers"); | |
1250 | manager_kill_workers(manager); | |
1251 | } else { | |
1252 | /* we are idle */ | |
1253 | if (manager->exit) { | |
1254 | r = sd_event_exit(manager->event, 0); | |
1255 | if (r < 0) | |
1256 | return r; | |
1257 | } else if (manager->cgroup) | |
1258 | /* cleanup possible left-over processes in our cgroup */ | |
5a920b42 | 1259 | cg_kill(SYSTEMD_CGROUP_CONTROLLER, manager->cgroup, SIGKILL, CGROUP_IGNORE_SELF, NULL, NULL, NULL); |
86f210e9 MP |
1260 | } |
1261 | } | |
1262 | ||
e3bff60a | 1263 | return 1; |
663996b3 MS |
1264 | } |
1265 | ||
86f210e9 MP |
1266 | static int listen_fds(int *rctrl, int *rnetlink) { |
1267 | _cleanup_udev_unref_ struct udev *udev = NULL; | |
1268 | int ctrl_fd = -1, netlink_fd = -1; | |
1269 | int fd, n, r; | |
1270 | ||
1271 | assert(rctrl); | |
1272 | assert(rnetlink); | |
663996b3 MS |
1273 | |
1274 | n = sd_listen_fds(true); | |
86f210e9 MP |
1275 | if (n < 0) |
1276 | return n; | |
663996b3 MS |
1277 | |
1278 | for (fd = SD_LISTEN_FDS_START; fd < n + SD_LISTEN_FDS_START; fd++) { | |
1279 | if (sd_is_socket(fd, AF_LOCAL, SOCK_SEQPACKET, -1)) { | |
86f210e9 MP |
1280 | if (ctrl_fd >= 0) |
1281 | return -EINVAL; | |
1282 | ctrl_fd = fd; | |
663996b3 MS |
1283 | continue; |
1284 | } | |
1285 | ||
1286 | if (sd_is_socket(fd, AF_NETLINK, SOCK_RAW, -1)) { | |
86f210e9 MP |
1287 | if (netlink_fd >= 0) |
1288 | return -EINVAL; | |
1289 | netlink_fd = fd; | |
663996b3 MS |
1290 | continue; |
1291 | } | |
1292 | ||
86f210e9 MP |
1293 | return -EINVAL; |
1294 | } | |
1295 | ||
1296 | if (ctrl_fd < 0) { | |
1297 | _cleanup_udev_ctrl_unref_ struct udev_ctrl *ctrl = NULL; | |
1298 | ||
1299 | udev = udev_new(); | |
1300 | if (!udev) | |
1301 | return -ENOMEM; | |
1302 | ||
1303 | ctrl = udev_ctrl_new(udev); | |
1304 | if (!ctrl) | |
1305 | return log_error_errno(EINVAL, "error initializing udev control socket"); | |
1306 | ||
1307 | r = udev_ctrl_enable_receiving(ctrl); | |
1308 | if (r < 0) | |
1309 | return log_error_errno(EINVAL, "error binding udev control socket"); | |
1310 | ||
1311 | fd = udev_ctrl_get_fd(ctrl); | |
1312 | if (fd < 0) | |
1313 | return log_error_errno(EIO, "could not get ctrl fd"); | |
1314 | ||
1315 | ctrl_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
1316 | if (ctrl_fd < 0) | |
1317 | return log_error_errno(errno, "could not dup ctrl fd: %m"); | |
1318 | } | |
1319 | ||
1320 | if (netlink_fd < 0) { | |
1321 | _cleanup_udev_monitor_unref_ struct udev_monitor *monitor = NULL; | |
1322 | ||
1323 | if (!udev) { | |
1324 | udev = udev_new(); | |
1325 | if (!udev) | |
1326 | return -ENOMEM; | |
1327 | } | |
1328 | ||
1329 | monitor = udev_monitor_new_from_netlink(udev, "kernel"); | |
1330 | if (!monitor) | |
1331 | return log_error_errno(EINVAL, "error initializing netlink socket"); | |
1332 | ||
1333 | (void) udev_monitor_set_receive_buffer_size(monitor, 128 * 1024 * 1024); | |
1334 | ||
1335 | r = udev_monitor_enable_receiving(monitor); | |
1336 | if (r < 0) | |
1337 | return log_error_errno(EINVAL, "error binding netlink socket"); | |
1338 | ||
1339 | fd = udev_monitor_get_fd(monitor); | |
1340 | if (fd < 0) | |
1341 | return log_error_errno(netlink_fd, "could not get uevent fd: %m"); | |
1342 | ||
1343 | netlink_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
1344 | if (ctrl_fd < 0) | |
1345 | return log_error_errno(errno, "could not dup netlink fd: %m"); | |
663996b3 MS |
1346 | } |
1347 | ||
86f210e9 MP |
1348 | *rctrl = ctrl_fd; |
1349 | *rnetlink = netlink_fd; | |
663996b3 | 1350 | |
663996b3 MS |
1351 | return 0; |
1352 | } | |
1353 | ||
1354 | /* | |
f47781d8 | 1355 | * read the kernel command line, in case we need to get into debug mode |
e3bff60a MP |
1356 | * udev.log-priority=<level> syslog priority |
1357 | * udev.children-max=<number of workers> events are fully serialized if set to 1 | |
1358 | * udev.exec-delay=<number of seconds> delay execution of every executed program | |
1359 | * udev.event-timeout=<number of seconds> seconds to wait before terminating an event | |
663996b3 | 1360 | */ |
e3bff60a | 1361 | static int parse_proc_cmdline_item(const char *key, const char *value) { |
7035cd9e | 1362 | const char *full_key = key; |
60f067b4 | 1363 | int r; |
663996b3 | 1364 | |
e3bff60a | 1365 | assert(key); |
663996b3 | 1366 | |
e3bff60a MP |
1367 | if (!value) |
1368 | return 0; | |
663996b3 | 1369 | |
e3bff60a MP |
1370 | if (startswith(key, "rd.")) |
1371 | key += strlen("rd."); | |
663996b3 | 1372 | |
e3bff60a MP |
1373 | if (startswith(key, "udev.")) |
1374 | key += strlen("udev."); | |
1375 | else | |
1376 | return 0; | |
663996b3 | 1377 | |
e3bff60a MP |
1378 | if (streq(key, "log-priority")) { |
1379 | int prio; | |
663996b3 | 1380 | |
e3bff60a | 1381 | prio = util_log_priority(value); |
7035cd9e MP |
1382 | if (prio < 0) |
1383 | goto invalid; | |
e3bff60a MP |
1384 | log_set_max_level(prio); |
1385 | } else if (streq(key, "children-max")) { | |
1386 | r = safe_atou(value, &arg_children_max); | |
1387 | if (r < 0) | |
7035cd9e | 1388 | goto invalid; |
e3bff60a MP |
1389 | } else if (streq(key, "exec-delay")) { |
1390 | r = safe_atoi(value, &arg_exec_delay); | |
1391 | if (r < 0) | |
7035cd9e | 1392 | goto invalid; |
e3bff60a MP |
1393 | } else if (streq(key, "event-timeout")) { |
1394 | r = safe_atou64(value, &arg_event_timeout_usec); | |
1395 | if (r < 0) | |
7035cd9e MP |
1396 | goto invalid; |
1397 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1398 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
663996b3 | 1399 | } |
e3bff60a | 1400 | |
7035cd9e MP |
1401 | return 0; |
1402 | invalid: | |
1403 | log_warning("invalid %s ignored: %s", full_key, value); | |
e3bff60a | 1404 | return 0; |
663996b3 MS |
1405 | } |
1406 | ||
5eef597e MP |
1407 | static void help(void) { |
1408 | printf("%s [OPTIONS...]\n\n" | |
1409 | "Manages devices.\n\n" | |
e735f4d4 MP |
1410 | " -h --help Print this message\n" |
1411 | " --version Print version of the program\n" | |
1412 | " --daemon Detach and run in the background\n" | |
1413 | " --debug Enable debug output\n" | |
1414 | " --children-max=INT Set maximum number of workers\n" | |
1415 | " --exec-delay=SECONDS Seconds to wait before executing RUN=\n" | |
1416 | " --event-timeout=SECONDS Seconds to wait before terminating an event\n" | |
1417 | " --resolve-names=early|late|never\n" | |
1418 | " When to resolve users and groups\n" | |
5eef597e MP |
1419 | , program_invocation_short_name); |
1420 | } | |
1421 | ||
1422 | static int parse_argv(int argc, char *argv[]) { | |
663996b3 | 1423 | static const struct option options[] = { |
5eef597e MP |
1424 | { "daemon", no_argument, NULL, 'd' }, |
1425 | { "debug", no_argument, NULL, 'D' }, | |
1426 | { "children-max", required_argument, NULL, 'c' }, | |
1427 | { "exec-delay", required_argument, NULL, 'e' }, | |
1428 | { "event-timeout", required_argument, NULL, 't' }, | |
1429 | { "resolve-names", required_argument, NULL, 'N' }, | |
1430 | { "help", no_argument, NULL, 'h' }, | |
1431 | { "version", no_argument, NULL, 'V' }, | |
663996b3 MS |
1432 | {} |
1433 | }; | |
663996b3 | 1434 | |
5eef597e | 1435 | int c; |
663996b3 | 1436 | |
5eef597e MP |
1437 | assert(argc >= 0); |
1438 | assert(argv); | |
14228c0d | 1439 | |
7035cd9e | 1440 | while ((c = getopt_long(argc, argv, "c:de:Dt:N:hV", options, NULL)) >= 0) { |
5eef597e | 1441 | int r; |
14228c0d | 1442 | |
5eef597e | 1443 | switch (c) { |
663996b3 | 1444 | |
663996b3 | 1445 | case 'd': |
5eef597e | 1446 | arg_daemonize = true; |
663996b3 MS |
1447 | break; |
1448 | case 'c': | |
e3bff60a | 1449 | r = safe_atou(optarg, &arg_children_max); |
5eef597e MP |
1450 | if (r < 0) |
1451 | log_warning("Invalid --children-max ignored: %s", optarg); | |
663996b3 MS |
1452 | break; |
1453 | case 'e': | |
5eef597e MP |
1454 | r = safe_atoi(optarg, &arg_exec_delay); |
1455 | if (r < 0) | |
1456 | log_warning("Invalid --exec-delay ignored: %s", optarg); | |
1457 | break; | |
1458 | case 't': | |
1459 | r = safe_atou64(optarg, &arg_event_timeout_usec); | |
1460 | if (r < 0) | |
1461 | log_warning("Invalid --event-timeout ignored: %s", optarg); | |
1462 | else { | |
1463 | arg_event_timeout_usec *= USEC_PER_SEC; | |
1464 | arg_event_timeout_warn_usec = (arg_event_timeout_usec / 3) ? : 1; | |
1465 | } | |
663996b3 MS |
1466 | break; |
1467 | case 'D': | |
5eef597e | 1468 | arg_debug = true; |
663996b3 MS |
1469 | break; |
1470 | case 'N': | |
1471 | if (streq(optarg, "early")) { | |
5eef597e | 1472 | arg_resolve_names = 1; |
663996b3 | 1473 | } else if (streq(optarg, "late")) { |
5eef597e | 1474 | arg_resolve_names = 0; |
663996b3 | 1475 | } else if (streq(optarg, "never")) { |
5eef597e | 1476 | arg_resolve_names = -1; |
663996b3 | 1477 | } else { |
60f067b4 | 1478 | log_error("resolve-names must be early, late or never"); |
5eef597e | 1479 | return 0; |
663996b3 MS |
1480 | } |
1481 | break; | |
1482 | case 'h': | |
5eef597e MP |
1483 | help(); |
1484 | return 0; | |
663996b3 MS |
1485 | case 'V': |
1486 | printf("%s\n", VERSION); | |
5eef597e MP |
1487 | return 0; |
1488 | case '?': | |
1489 | return -EINVAL; | |
663996b3 | 1490 | default: |
5eef597e MP |
1491 | assert_not_reached("Unhandled option"); |
1492 | ||
663996b3 MS |
1493 | } |
1494 | } | |
1495 | ||
5eef597e MP |
1496 | return 1; |
1497 | } | |
1498 | ||
86f210e9 | 1499 | static int manager_new(Manager **ret, int fd_ctrl, int fd_uevent, const char *cgroup) { |
e3bff60a | 1500 | _cleanup_(manager_freep) Manager *manager = NULL; |
86f210e9 | 1501 | int r, fd_worker, one = 1; |
5eef597e | 1502 | |
e3bff60a | 1503 | assert(ret); |
86f210e9 MP |
1504 | assert(fd_ctrl >= 0); |
1505 | assert(fd_uevent >= 0); | |
e3bff60a MP |
1506 | |
1507 | manager = new0(Manager, 1); | |
1508 | if (!manager) | |
1509 | return log_oom(); | |
1510 | ||
e3bff60a MP |
1511 | manager->fd_inotify = -1; |
1512 | manager->worker_watch[WRITE_END] = -1; | |
1513 | manager->worker_watch[READ_END] = -1; | |
1514 | ||
1515 | manager->udev = udev_new(); | |
1516 | if (!manager->udev) | |
1517 | return log_error_errno(errno, "could not allocate udev context: %m"); | |
1518 | ||
1519 | udev_builtin_init(manager->udev); | |
1520 | ||
1521 | manager->rules = udev_rules_new(manager->udev, arg_resolve_names); | |
1522 | if (!manager->rules) | |
1523 | return log_error_errno(ENOMEM, "error reading rules"); | |
1524 | ||
1525 | udev_list_node_init(&manager->events); | |
1526 | udev_list_init(manager->udev, &manager->properties, true); | |
1527 | ||
86f210e9 | 1528 | manager->cgroup = cgroup; |
e3bff60a | 1529 | |
86f210e9 MP |
1530 | manager->ctrl = udev_ctrl_new_from_fd(manager->udev, fd_ctrl); |
1531 | if (!manager->ctrl) | |
1532 | return log_error_errno(EINVAL, "error taking over udev control socket"); | |
e3bff60a | 1533 | |
86f210e9 MP |
1534 | manager->monitor = udev_monitor_new_from_netlink_fd(manager->udev, "kernel", fd_uevent); |
1535 | if (!manager->monitor) | |
1536 | return log_error_errno(EINVAL, "error taking over netlink socket"); | |
e3bff60a MP |
1537 | |
1538 | /* unnamed socket from workers to the main daemon */ | |
1539 | r = socketpair(AF_LOCAL, SOCK_DGRAM|SOCK_CLOEXEC, 0, manager->worker_watch); | |
1540 | if (r < 0) | |
1541 | return log_error_errno(errno, "error creating socketpair: %m"); | |
1542 | ||
86f210e9 | 1543 | fd_worker = manager->worker_watch[READ_END]; |
e3bff60a | 1544 | |
86f210e9 | 1545 | r = setsockopt(fd_worker, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)); |
e3bff60a MP |
1546 | if (r < 0) |
1547 | return log_error_errno(errno, "could not enable SO_PASSCRED: %m"); | |
1548 | ||
1549 | manager->fd_inotify = udev_watch_init(manager->udev); | |
1550 | if (manager->fd_inotify < 0) | |
1551 | return log_error_errno(ENOMEM, "error initializing inotify"); | |
1552 | ||
1553 | udev_watch_restore(manager->udev); | |
1554 | ||
1555 | /* block and listen to all signals on signalfd */ | |
86f210e9 MP |
1556 | assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGTERM, SIGINT, SIGHUP, SIGCHLD, -1) >= 0); |
1557 | ||
1558 | r = sd_event_default(&manager->event); | |
1559 | if (r < 0) | |
db2df898 | 1560 | return log_error_errno(r, "could not allocate event loop: %m"); |
86f210e9 MP |
1561 | |
1562 | r = sd_event_add_signal(manager->event, NULL, SIGINT, on_sigterm, manager); | |
1563 | if (r < 0) | |
1564 | return log_error_errno(r, "error creating sigint event source: %m"); | |
1565 | ||
1566 | r = sd_event_add_signal(manager->event, NULL, SIGTERM, on_sigterm, manager); | |
1567 | if (r < 0) | |
1568 | return log_error_errno(r, "error creating sigterm event source: %m"); | |
1569 | ||
1570 | r = sd_event_add_signal(manager->event, NULL, SIGHUP, on_sighup, manager); | |
1571 | if (r < 0) | |
1572 | return log_error_errno(r, "error creating sighup event source: %m"); | |
1573 | ||
1574 | r = sd_event_add_signal(manager->event, NULL, SIGCHLD, on_sigchld, manager); | |
1575 | if (r < 0) | |
1576 | return log_error_errno(r, "error creating sigchld event source: %m"); | |
1577 | ||
1578 | r = sd_event_set_watchdog(manager->event, true); | |
1579 | if (r < 0) | |
1580 | return log_error_errno(r, "error creating watchdog event source: %m"); | |
1581 | ||
1582 | r = sd_event_add_io(manager->event, &manager->ctrl_event, fd_ctrl, EPOLLIN, on_ctrl_msg, manager); | |
1583 | if (r < 0) | |
1584 | return log_error_errno(r, "error creating ctrl event source: %m"); | |
1585 | ||
1586 | /* This needs to be after the inotify and uevent handling, to make sure | |
1587 | * that the ping is send back after fully processing the pending uevents | |
1588 | * (including the synthetic ones we may create due to inotify events). | |
1589 | */ | |
1590 | r = sd_event_source_set_priority(manager->ctrl_event, SD_EVENT_PRIORITY_IDLE); | |
1591 | if (r < 0) | |
1592 | return log_error_errno(r, "cold not set IDLE event priority for ctrl event source: %m"); | |
1593 | ||
1594 | r = sd_event_add_io(manager->event, &manager->inotify_event, manager->fd_inotify, EPOLLIN, on_inotify, manager); | |
1595 | if (r < 0) | |
1596 | return log_error_errno(r, "error creating inotify event source: %m"); | |
1597 | ||
1598 | r = sd_event_add_io(manager->event, &manager->uevent_event, fd_uevent, EPOLLIN, on_uevent, manager); | |
1599 | if (r < 0) | |
1600 | return log_error_errno(r, "error creating uevent event source: %m"); | |
1601 | ||
1602 | r = sd_event_add_io(manager->event, NULL, fd_worker, EPOLLIN, on_worker, manager); | |
1603 | if (r < 0) | |
1604 | return log_error_errno(r, "error creating worker event source: %m"); | |
1605 | ||
1606 | r = sd_event_add_post(manager->event, NULL, on_post, manager); | |
1607 | if (r < 0) | |
1608 | return log_error_errno(r, "error creating post event source: %m"); | |
e3bff60a MP |
1609 | |
1610 | *ret = manager; | |
1611 | manager = NULL; | |
1612 | ||
86f210e9 | 1613 | return 0; |
e3bff60a MP |
1614 | } |
1615 | ||
fb183854 | 1616 | static int run(int fd_ctrl, int fd_uevent, const char *cgroup) { |
e3bff60a | 1617 | _cleanup_(manager_freep) Manager *manager = NULL; |
fb183854 MP |
1618 | int r; |
1619 | ||
1620 | r = manager_new(&manager, fd_ctrl, fd_uevent, cgroup); | |
1621 | if (r < 0) { | |
1622 | r = log_error_errno(r, "failed to allocate manager object: %m"); | |
1623 | goto exit; | |
1624 | } | |
1625 | ||
1626 | r = udev_rules_apply_static_dev_perms(manager->rules); | |
1627 | if (r < 0) | |
1628 | log_error_errno(r, "failed to apply permissions on static device nodes: %m"); | |
1629 | ||
1630 | (void) sd_notify(false, | |
1631 | "READY=1\n" | |
1632 | "STATUS=Processing..."); | |
1633 | ||
1634 | r = sd_event_loop(manager->event); | |
1635 | if (r < 0) { | |
1636 | log_error_errno(r, "event loop failed: %m"); | |
1637 | goto exit; | |
1638 | } | |
1639 | ||
1640 | sd_event_get_exit_code(manager->event, &r); | |
1641 | ||
1642 | exit: | |
1643 | sd_notify(false, | |
1644 | "STOPPING=1\n" | |
1645 | "STATUS=Shutting down..."); | |
1646 | if (manager) | |
1647 | udev_ctrl_cleanup(manager->ctrl); | |
1648 | return r; | |
1649 | } | |
1650 | ||
1651 | int main(int argc, char *argv[]) { | |
86f210e9 | 1652 | _cleanup_free_ char *cgroup = NULL; |
4c89c718 MP |
1653 | int fd_ctrl = -1, fd_uevent = -1; |
1654 | int r; | |
5eef597e MP |
1655 | |
1656 | log_set_target(LOG_TARGET_AUTO); | |
1657 | log_parse_environment(); | |
1658 | log_open(); | |
1659 | ||
5eef597e MP |
1660 | r = parse_argv(argc, argv); |
1661 | if (r <= 0) | |
1662 | goto exit; | |
1663 | ||
e3bff60a MP |
1664 | r = parse_proc_cmdline(parse_proc_cmdline_item); |
1665 | if (r < 0) | |
1666 | log_warning_errno(r, "failed to parse kernel command line, ignoring: %m"); | |
663996b3 | 1667 | |
fb183854 MP |
1668 | if (arg_debug) { |
1669 | log_set_target(LOG_TARGET_CONSOLE); | |
5eef597e | 1670 | log_set_max_level(LOG_DEBUG); |
fb183854 | 1671 | } |
5eef597e | 1672 | |
663996b3 | 1673 | if (getuid() != 0) { |
e3bff60a | 1674 | r = log_error_errno(EPERM, "root privileges required"); |
5eef597e MP |
1675 | goto exit; |
1676 | } | |
1677 | ||
e3bff60a MP |
1678 | if (arg_children_max == 0) { |
1679 | cpu_set_t cpu_set; | |
5eef597e | 1680 | |
e3bff60a | 1681 | arg_children_max = 8; |
663996b3 | 1682 | |
6300502b | 1683 | if (sched_getaffinity(0, sizeof(cpu_set), &cpu_set) == 0) |
86f210e9 | 1684 | arg_children_max += CPU_COUNT(&cpu_set) * 2; |
f47781d8 | 1685 | |
e3bff60a | 1686 | log_debug("set children_max to %u", arg_children_max); |
5eef597e | 1687 | } |
663996b3 | 1688 | |
e3bff60a MP |
1689 | /* set umask before creating any file/directory */ |
1690 | r = chdir("/"); | |
1691 | if (r < 0) { | |
1692 | r = log_error_errno(errno, "could not change dir to /: %m"); | |
1693 | goto exit; | |
663996b3 MS |
1694 | } |
1695 | ||
e3bff60a MP |
1696 | umask(022); |
1697 | ||
aa27b158 | 1698 | r = mac_selinux_init(); |
e3bff60a MP |
1699 | if (r < 0) { |
1700 | log_error_errno(r, "could not initialize labelling: %m"); | |
663996b3 MS |
1701 | goto exit; |
1702 | } | |
1703 | ||
e3bff60a MP |
1704 | r = mkdir("/run/udev", 0755); |
1705 | if (r < 0 && errno != EEXIST) { | |
1706 | r = log_error_errno(errno, "could not create /run/udev: %m"); | |
663996b3 MS |
1707 | goto exit; |
1708 | } | |
1709 | ||
e3bff60a | 1710 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5eef597e | 1711 | |
86f210e9 MP |
1712 | if (getppid() == 1) { |
1713 | /* get our own cgroup, we regularly kill everything udev has left behind | |
1714 | we only do this on systemd systems, and only if we are directly spawned | |
1715 | by PID1. otherwise we are not guaranteed to have a dedicated cgroup */ | |
1716 | r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &cgroup); | |
fb183854 | 1717 | if (r < 0) { |
aa27b158 | 1718 | if (r == -ENOENT || r == -ENOMEDIUM) |
fb183854 MP |
1719 | log_debug_errno(r, "did not find dedicated cgroup: %m"); |
1720 | else | |
1721 | log_warning_errno(r, "failed to get cgroup: %m"); | |
1722 | } | |
86f210e9 | 1723 | } |
e3bff60a | 1724 | |
86f210e9 MP |
1725 | r = listen_fds(&fd_ctrl, &fd_uevent); |
1726 | if (r < 0) { | |
1727 | r = log_error_errno(r, "could not listen on fds: %m"); | |
1728 | goto exit; | |
1729 | } | |
5eef597e MP |
1730 | |
1731 | if (arg_daemonize) { | |
663996b3 MS |
1732 | pid_t pid; |
1733 | ||
86f210e9 MP |
1734 | log_info("starting version " VERSION); |
1735 | ||
1736 | /* connect /dev/null to stdin, stdout, stderr */ | |
1737 | if (log_get_max_level() < LOG_DEBUG) | |
1738 | (void) make_null_stdio(); | |
1739 | ||
663996b3 MS |
1740 | pid = fork(); |
1741 | switch (pid) { | |
1742 | case 0: | |
1743 | break; | |
1744 | case -1: | |
e3bff60a | 1745 | r = log_error_errno(errno, "fork of daemon failed: %m"); |
663996b3 MS |
1746 | goto exit; |
1747 | default: | |
e3bff60a MP |
1748 | mac_selinux_finish(); |
1749 | log_close(); | |
1750 | _exit(EXIT_SUCCESS); | |
663996b3 MS |
1751 | } |
1752 | ||
1753 | setsid(); | |
1754 | ||
7035cd9e | 1755 | write_string_file("/proc/self/oom_score_adj", "-1000", 0); |
86f210e9 | 1756 | } |
663996b3 | 1757 | |
fb183854 | 1758 | r = run(fd_ctrl, fd_uevent, cgroup); |
86f210e9 | 1759 | |
663996b3 | 1760 | exit: |
5eef597e | 1761 | mac_selinux_finish(); |
663996b3 | 1762 | log_close(); |
e3bff60a | 1763 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
663996b3 | 1764 | } |