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[thirdparty/systemd.git] / src / udev / udev-event.c
1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org>
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <ctype.h>
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <net/if.h>
23 #include <poll.h>
24 #include <stddef.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/epoll.h>
29 #include <sys/prctl.h>
30 #include <sys/signalfd.h>
31 #include <sys/wait.h>
32 #include <unistd.h>
33
34 #include "alloc-util.h"
35 #include "fd-util.h"
36 #include "format-util.h"
37 #include "netlink-util.h"
38 #include "process-util.h"
39 #include "signal-util.h"
40 #include "string-util.h"
41 #include "udev.h"
42
43 typedef struct Spawn {
44 const char *cmd;
45 pid_t pid;
46 usec_t timeout_warn;
47 usec_t timeout;
48 bool accept_failure;
49 } Spawn;
50
51 struct udev_event *udev_event_new(struct udev_device *dev) {
52 struct udev *udev = udev_device_get_udev(dev);
53 struct udev_event *event;
54
55 event = new0(struct udev_event, 1);
56 if (event == NULL)
57 return NULL;
58 event->dev = dev;
59 event->udev = udev;
60 udev_list_init(udev, &event->run_list, false);
61 udev_list_init(udev, &event->seclabel_list, false);
62 event->birth_usec = now(CLOCK_MONOTONIC);
63 return event;
64 }
65
66 void udev_event_unref(struct udev_event *event) {
67 if (event == NULL)
68 return;
69 sd_netlink_unref(event->rtnl);
70 udev_list_cleanup(&event->run_list);
71 udev_list_cleanup(&event->seclabel_list);
72 free(event->program_result);
73 free(event->name);
74 free(event);
75 }
76
77 enum subst_type {
78 SUBST_UNKNOWN,
79 SUBST_DEVNODE,
80 SUBST_ATTR,
81 SUBST_ENV,
82 SUBST_KERNEL,
83 SUBST_KERNEL_NUMBER,
84 SUBST_DRIVER,
85 SUBST_DEVPATH,
86 SUBST_ID,
87 SUBST_MAJOR,
88 SUBST_MINOR,
89 SUBST_RESULT,
90 SUBST_PARENT,
91 SUBST_NAME,
92 SUBST_LINKS,
93 SUBST_ROOT,
94 SUBST_SYS,
95 };
96
97 static size_t subst_format_var(struct udev_event *event, struct udev_device *dev,
98 enum subst_type type, char *attr,
99 char *dest, size_t l) {
100 char *s = dest;
101
102 switch (type) {
103 case SUBST_DEVPATH:
104 l = strpcpy(&s, l, udev_device_get_devpath(dev));
105 break;
106 case SUBST_KERNEL:
107 l = strpcpy(&s, l, udev_device_get_sysname(dev));
108 break;
109 case SUBST_KERNEL_NUMBER:
110 if (udev_device_get_sysnum(dev) == NULL)
111 break;
112 l = strpcpy(&s, l, udev_device_get_sysnum(dev));
113 break;
114 case SUBST_ID:
115 if (event->dev_parent == NULL)
116 break;
117 l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
118 break;
119 case SUBST_DRIVER: {
120 const char *driver;
121
122 if (event->dev_parent == NULL)
123 break;
124
125 driver = udev_device_get_driver(event->dev_parent);
126 if (driver == NULL)
127 break;
128 l = strpcpy(&s, l, driver);
129 break;
130 }
131 case SUBST_MAJOR: {
132 char num[UTIL_PATH_SIZE];
133
134 sprintf(num, "%u", major(udev_device_get_devnum(dev)));
135 l = strpcpy(&s, l, num);
136 break;
137 }
138 case SUBST_MINOR: {
139 char num[UTIL_PATH_SIZE];
140
141 sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
142 l = strpcpy(&s, l, num);
143 break;
144 }
145 case SUBST_RESULT: {
146 char *rest;
147 int i;
148
149 if (event->program_result == NULL)
150 break;
151 /* get part of the result string */
152 i = 0;
153 if (attr != NULL)
154 i = strtoul(attr, &rest, 10);
155 if (i > 0) {
156 char result[UTIL_PATH_SIZE];
157 char tmp[UTIL_PATH_SIZE];
158 char *cpos;
159
160 strscpy(result, sizeof(result), event->program_result);
161 cpos = result;
162 while (--i) {
163 while (cpos[0] != '\0' && !isspace(cpos[0]))
164 cpos++;
165 while (isspace(cpos[0]))
166 cpos++;
167 if (cpos[0] == '\0')
168 break;
169 }
170 if (i > 0) {
171 log_error("requested part of result string not found");
172 break;
173 }
174 strscpy(tmp, sizeof(tmp), cpos);
175 /* %{2+}c copies the whole string from the second part on */
176 if (rest[0] != '+') {
177 cpos = strchr(tmp, ' ');
178 if (cpos)
179 cpos[0] = '\0';
180 }
181 l = strpcpy(&s, l, tmp);
182 } else {
183 l = strpcpy(&s, l, event->program_result);
184 }
185 break;
186 }
187 case SUBST_ATTR: {
188 const char *value = NULL;
189 char vbuf[UTIL_NAME_SIZE];
190 size_t len;
191 int count;
192
193 if (attr == NULL) {
194 log_error("missing file parameter for attr");
195 break;
196 }
197
198 /* try to read the value specified by "[dmi/id]product_name" */
199 if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
200 value = vbuf;
201
202 /* try to read the attribute the device */
203 if (value == NULL)
204 value = udev_device_get_sysattr_value(event->dev, attr);
205
206 /* try to read the attribute of the parent device, other matches have selected */
207 if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
208 value = udev_device_get_sysattr_value(event->dev_parent, attr);
209
210 if (value == NULL)
211 break;
212
213 /* strip trailing whitespace, and replace unwanted characters */
214 if (value != vbuf)
215 strscpy(vbuf, sizeof(vbuf), value);
216 len = strlen(vbuf);
217 while (len > 0 && isspace(vbuf[--len]))
218 vbuf[len] = '\0';
219 count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
220 if (count > 0)
221 log_debug("%i character(s) replaced" , count);
222 l = strpcpy(&s, l, vbuf);
223 break;
224 }
225 case SUBST_PARENT: {
226 struct udev_device *dev_parent;
227 const char *devnode;
228
229 dev_parent = udev_device_get_parent(event->dev);
230 if (dev_parent == NULL)
231 break;
232 devnode = udev_device_get_devnode(dev_parent);
233 if (devnode != NULL)
234 l = strpcpy(&s, l, devnode + STRLEN("/dev/"));
235 break;
236 }
237 case SUBST_DEVNODE:
238 if (udev_device_get_devnode(dev) != NULL)
239 l = strpcpy(&s, l, udev_device_get_devnode(dev));
240 break;
241 case SUBST_NAME:
242 if (event->name != NULL)
243 l = strpcpy(&s, l, event->name);
244 else if (udev_device_get_devnode(dev) != NULL)
245 l = strpcpy(&s, l,
246 udev_device_get_devnode(dev) + STRLEN("/dev/"));
247 else
248 l = strpcpy(&s, l, udev_device_get_sysname(dev));
249 break;
250 case SUBST_LINKS: {
251 struct udev_list_entry *list_entry;
252
253 list_entry = udev_device_get_devlinks_list_entry(dev);
254 if (list_entry == NULL)
255 break;
256 l = strpcpy(&s, l,
257 udev_list_entry_get_name(list_entry) + STRLEN("/dev/"));
258 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
259 l = strpcpyl(&s, l, " ",
260 udev_list_entry_get_name(list_entry) + STRLEN("/dev/"),
261 NULL);
262 break;
263 }
264 case SUBST_ROOT:
265 l = strpcpy(&s, l, "/dev");
266 break;
267 case SUBST_SYS:
268 l = strpcpy(&s, l, "/sys");
269 break;
270 case SUBST_ENV:
271 if (attr == NULL) {
272 break;
273 } else {
274 const char *value;
275
276 value = udev_device_get_property_value(event->dev, attr);
277 if (value == NULL)
278 break;
279 l = strpcpy(&s, l, value);
280 break;
281 }
282 default:
283 log_error("unknown substitution type=%i", type);
284 break;
285 }
286
287 return s - dest;
288 }
289
290 size_t udev_event_apply_format(struct udev_event *event,
291 const char *src, char *dest, size_t size,
292 bool replace_whitespace) {
293 struct udev_device *dev = event->dev;
294 static const struct subst_map {
295 const char *name;
296 const char fmt;
297 enum subst_type type;
298 } map[] = {
299 { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
300 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
301 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
302 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
303 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
304 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
305 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
306 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
307 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
308 { .name = "id", .fmt = 'b', .type = SUBST_ID },
309 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
310 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
311 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
312 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
313 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
314 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
315 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
316 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
317 };
318 const char *from;
319 char *s;
320 size_t l;
321
322 assert(dev);
323
324 from = src;
325 s = dest;
326 l = size;
327
328 for (;;) {
329 enum subst_type type = SUBST_UNKNOWN;
330 char attrbuf[UTIL_PATH_SIZE];
331 char *attr = NULL;
332 size_t subst_len;
333
334 while (from[0] != '\0') {
335 if (from[0] == '$') {
336 /* substitute named variable */
337 unsigned int i;
338
339 if (from[1] == '$') {
340 from++;
341 goto copy;
342 }
343
344 for (i = 0; i < ELEMENTSOF(map); i++) {
345 if (startswith(&from[1], map[i].name)) {
346 type = map[i].type;
347 from += strlen(map[i].name)+1;
348 goto subst;
349 }
350 }
351 } else if (from[0] == '%') {
352 /* substitute format char */
353 unsigned int i;
354
355 if (from[1] == '%') {
356 from++;
357 goto copy;
358 }
359
360 for (i = 0; i < ELEMENTSOF(map); i++) {
361 if (from[1] == map[i].fmt) {
362 type = map[i].type;
363 from += 2;
364 goto subst;
365 }
366 }
367 }
368 copy:
369 /* copy char */
370 if (l < 2) /* need space for this char and the terminating NUL */
371 goto out;
372 s[0] = from[0];
373 from++;
374 s++;
375 l--;
376 }
377
378 goto out;
379 subst:
380 /* extract possible $format{attr} */
381 if (from[0] == '{') {
382 unsigned int i;
383
384 from++;
385 for (i = 0; from[i] != '}'; i++)
386 if (from[i] == '\0') {
387 log_error("missing closing brace for format '%s'", src);
388 goto out;
389 }
390
391 if (i >= sizeof(attrbuf))
392 goto out;
393 memcpy(attrbuf, from, i);
394 attrbuf[i] = '\0';
395 from += i+1;
396 attr = attrbuf;
397 } else {
398 attr = NULL;
399 }
400
401 subst_len = subst_format_var(event, dev, type, attr, s, l);
402
403 /* SUBST_RESULT handles spaces itself */
404 if (replace_whitespace && type != SUBST_RESULT)
405 /* util_replace_whitespace can replace in-place,
406 * and does nothing if subst_len == 0
407 */
408 subst_len = util_replace_whitespace(s, s, subst_len);
409
410 s += subst_len;
411 l -= subst_len;
412 }
413
414 out:
415 assert(l >= 1);
416 s[0] = '\0';
417 return l;
418 }
419
420 static int spawn_exec(struct udev_event *event,
421 const char *cmd, char *const argv[], char **envp,
422 int fd_stdout, int fd_stderr) {
423 _cleanup_close_ int fd = -1;
424 int r;
425
426 /* discard child output or connect to pipe */
427 fd = open("/dev/null", O_RDWR);
428 if (fd >= 0) {
429 r = dup2(fd, STDIN_FILENO);
430 if (r < 0)
431 log_warning_errno(errno, "redirecting stdin failed: %m");
432
433 if (fd_stdout < 0) {
434 r = dup2(fd, STDOUT_FILENO);
435 if (r < 0)
436 log_warning_errno(errno, "redirecting stdout failed: %m");
437 }
438
439 if (fd_stderr < 0) {
440 r = dup2(fd, STDERR_FILENO);
441 if (r < 0)
442 log_warning_errno(errno, "redirecting stderr failed: %m");
443 }
444 } else
445 log_warning_errno(errno, "open /dev/null failed: %m");
446
447 /* connect pipes to std{out,err} */
448 if (fd_stdout >= 0) {
449 r = dup2(fd_stdout, STDOUT_FILENO);
450 if (r < 0)
451 log_warning_errno(errno, "redirecting stdout failed: %m");
452
453 fd_stdout = safe_close(fd_stdout);
454 }
455
456 if (fd_stderr >= 0) {
457 r = dup2(fd_stderr, STDERR_FILENO);
458 if (r < 0)
459 log_warning_errno(errno, "redirecting stdout failed: %m");
460
461 fd_stderr = safe_close(fd_stderr);
462 }
463
464 /* terminate child in case parent goes away */
465 prctl(PR_SET_PDEATHSIG, SIGTERM);
466
467 /* restore sigmask before exec */
468 (void) reset_signal_mask();
469
470 execve(argv[0], argv, envp);
471
472 /* exec failed */
473 return log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
474 }
475
476 static void spawn_read(struct udev_event *event,
477 usec_t timeout_usec,
478 const char *cmd,
479 int fd_stdout, int fd_stderr,
480 char *result, size_t ressize) {
481 _cleanup_close_ int fd_ep = -1;
482 struct epoll_event ep_outpipe = {
483 .events = EPOLLIN,
484 .data.ptr = &fd_stdout,
485 };
486 struct epoll_event ep_errpipe = {
487 .events = EPOLLIN,
488 .data.ptr = &fd_stderr,
489 };
490 size_t respos = 0;
491 int r;
492
493 /* read from child if requested */
494 if (fd_stdout < 0 && fd_stderr < 0)
495 return;
496
497 fd_ep = epoll_create1(EPOLL_CLOEXEC);
498 if (fd_ep < 0) {
499 log_error_errno(errno, "error creating epoll fd: %m");
500 return;
501 }
502
503 if (fd_stdout >= 0) {
504 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
505 if (r < 0) {
506 log_error_errno(errno, "fail to add stdout fd to epoll: %m");
507 return;
508 }
509 }
510
511 if (fd_stderr >= 0) {
512 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
513 if (r < 0) {
514 log_error_errno(errno, "fail to add stderr fd to epoll: %m");
515 return;
516 }
517 }
518
519 /* read child output */
520 while (fd_stdout >= 0 || fd_stderr >= 0) {
521 int timeout;
522 int fdcount;
523 struct epoll_event ev[4];
524 int i;
525
526 if (timeout_usec > 0) {
527 usec_t age_usec;
528
529 age_usec = now(CLOCK_MONOTONIC) - event->birth_usec;
530 if (age_usec >= timeout_usec) {
531 log_error("timeout '%s'", cmd);
532 return;
533 }
534 timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
535 } else {
536 timeout = -1;
537 }
538
539 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
540 if (fdcount < 0) {
541 if (errno == EINTR)
542 continue;
543 log_error_errno(errno, "failed to poll: %m");
544 return;
545 } else if (fdcount == 0) {
546 log_error("timeout '%s'", cmd);
547 return;
548 }
549
550 for (i = 0; i < fdcount; i++) {
551 int *fd = (int *)ev[i].data.ptr;
552
553 if (*fd < 0)
554 continue;
555
556 if (ev[i].events & EPOLLIN) {
557 ssize_t count;
558 char buf[4096];
559
560 count = read(*fd, buf, sizeof(buf)-1);
561 if (count <= 0)
562 continue;
563 buf[count] = '\0';
564
565 /* store stdout result */
566 if (result != NULL && *fd == fd_stdout) {
567 if (respos + count < ressize) {
568 memcpy(&result[respos], buf, count);
569 respos += count;
570 } else {
571 log_error("'%s' ressize %zu too short", cmd, ressize);
572 }
573 }
574
575 /* log debug output only if we watch stderr */
576 if (fd_stderr >= 0) {
577 char *pos;
578 char *line;
579
580 pos = buf;
581 while ((line = strsep(&pos, "\n"))) {
582 if (pos != NULL || line[0] != '\0')
583 log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
584 }
585 }
586 } else if (ev[i].events & EPOLLHUP) {
587 r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
588 if (r < 0) {
589 log_error_errno(errno, "failed to remove fd from epoll: %m");
590 return;
591 }
592 *fd = -1;
593 }
594 }
595 }
596
597 /* return the child's stdout string */
598 if (result != NULL)
599 result[respos] = '\0';
600 }
601
602 static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
603 Spawn *spawn = userdata;
604 char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
605
606 assert(spawn);
607
608 kill_and_sigcont(spawn->pid, SIGKILL);
609
610 log_error("spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
611 format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
612
613 return 1;
614 }
615
616 static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
617 Spawn *spawn = userdata;
618 char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
619
620 assert(spawn);
621
622 log_warning("spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
623 format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
624
625 return 1;
626 }
627
628 static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
629 Spawn *spawn = userdata;
630
631 assert(spawn);
632
633 switch (si->si_code) {
634 case CLD_EXITED:
635 if (si->si_status == 0) {
636 log_debug("Process '%s' succeeded.", spawn->cmd);
637 sd_event_exit(sd_event_source_get_event(s), 0);
638
639 return 1;
640 } else if (spawn->accept_failure)
641 log_debug("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
642 else
643 log_warning("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
644
645 break;
646 case CLD_KILLED:
647 case CLD_DUMPED:
648 log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
649
650 break;
651 default:
652 log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
653 }
654
655 sd_event_exit(sd_event_source_get_event(s), -EIO);
656
657 return 1;
658 }
659
660 static int spawn_wait(struct udev_event *event,
661 usec_t timeout_usec,
662 usec_t timeout_warn_usec,
663 const char *cmd, pid_t pid,
664 bool accept_failure) {
665 Spawn spawn = {
666 .cmd = cmd,
667 .pid = pid,
668 .accept_failure = accept_failure,
669 };
670 _cleanup_(sd_event_unrefp) sd_event *e = NULL;
671 int r, ret;
672
673 r = sd_event_new(&e);
674 if (r < 0)
675 return r;
676
677 if (timeout_usec > 0) {
678 usec_t usec, age_usec;
679
680 usec = now(CLOCK_MONOTONIC);
681 age_usec = usec - event->birth_usec;
682 if (age_usec < timeout_usec) {
683 if (timeout_warn_usec > 0 && timeout_warn_usec < timeout_usec && age_usec < timeout_warn_usec) {
684 spawn.timeout_warn = timeout_warn_usec - age_usec;
685
686 r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
687 usec + spawn.timeout_warn, USEC_PER_SEC,
688 on_spawn_timeout_warning, &spawn);
689 if (r < 0)
690 return r;
691 }
692
693 spawn.timeout = timeout_usec - age_usec;
694
695 r = sd_event_add_time(e, NULL, CLOCK_MONOTONIC,
696 usec + spawn.timeout, USEC_PER_SEC, on_spawn_timeout, &spawn);
697 if (r < 0)
698 return r;
699 }
700 }
701
702 r = sd_event_add_child(e, NULL, pid, WEXITED, on_spawn_sigchld, &spawn);
703 if (r < 0)
704 return r;
705
706 r = sd_event_loop(e);
707 if (r < 0)
708 return r;
709
710 r = sd_event_get_exit_code(e, &ret);
711 if (r < 0)
712 return r;
713
714 return ret;
715 }
716
717 int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
718 int i = 0;
719 char *pos;
720
721 if (strchr(cmd, ' ') == NULL) {
722 argv[i++] = cmd;
723 goto out;
724 }
725
726 pos = cmd;
727 while (pos != NULL && pos[0] != '\0') {
728 if (IN_SET(pos[0], '\'', '"')) {
729 /* do not separate quotes or double quotes */
730 char delim[2] = { pos[0], '\0' };
731
732 pos++;
733 argv[i] = strsep(&pos, delim);
734 if (pos != NULL)
735 while (pos[0] == ' ')
736 pos++;
737 } else {
738 argv[i] = strsep(&pos, " ");
739 if (pos != NULL)
740 while (pos[0] == ' ')
741 pos++;
742 }
743 i++;
744 }
745 out:
746 argv[i] = NULL;
747 if (argc)
748 *argc = i;
749 return 0;
750 }
751
752 int udev_event_spawn(struct udev_event *event,
753 usec_t timeout_usec,
754 usec_t timeout_warn_usec,
755 bool accept_failure,
756 const char *cmd,
757 char *result, size_t ressize) {
758 int outpipe[2] = {-1, -1};
759 int errpipe[2] = {-1, -1};
760 pid_t pid;
761 int err = 0;
762
763 /* pipes from child to parent */
764 if (result != NULL || log_get_max_level() >= LOG_INFO) {
765 if (pipe2(outpipe, O_NONBLOCK) != 0) {
766 err = log_error_errno(errno, "pipe failed: %m");
767 goto out;
768 }
769 }
770 if (log_get_max_level() >= LOG_INFO) {
771 if (pipe2(errpipe, O_NONBLOCK) != 0) {
772 err = log_error_errno(errno, "pipe failed: %m");
773 goto out;
774 }
775 }
776
777 err = safe_fork("(spawn)", FORK_RESET_SIGNALS|FORK_LOG, &pid);
778 if (err < 0)
779 goto out;
780 if (err == 0) {
781 char arg[UTIL_PATH_SIZE];
782 char *argv[128];
783 char program[UTIL_PATH_SIZE];
784
785 /* child closes parent's ends of pipes */
786 outpipe[READ_END] = safe_close(outpipe[READ_END]);
787 errpipe[READ_END] = safe_close(errpipe[READ_END]);
788
789 strscpy(arg, sizeof(arg), cmd);
790 udev_build_argv(event->udev, arg, NULL, argv);
791
792 /* allow programs in /usr/lib/udev/ to be called without the path */
793 if (argv[0][0] != '/') {
794 strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
795 argv[0] = program;
796 }
797
798 log_debug("starting '%s'", cmd);
799
800 spawn_exec(event, cmd, argv, udev_device_get_properties_envp(event->dev),
801 outpipe[WRITE_END], errpipe[WRITE_END]);
802
803 _exit(2);
804 }
805
806 /* parent closed child's ends of pipes */
807 outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
808 errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
809
810 spawn_read(event,
811 timeout_usec,
812 cmd,
813 outpipe[READ_END], errpipe[READ_END],
814 result, ressize);
815
816 err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid, accept_failure);
817
818 out:
819 if (outpipe[READ_END] >= 0)
820 close(outpipe[READ_END]);
821 if (outpipe[WRITE_END] >= 0)
822 close(outpipe[WRITE_END]);
823 if (errpipe[READ_END] >= 0)
824 close(errpipe[READ_END]);
825 if (errpipe[WRITE_END] >= 0)
826 close(errpipe[WRITE_END]);
827 return err;
828 }
829
830 static int rename_netif(struct udev_event *event) {
831 struct udev_device *dev = event->dev;
832 char name[IFNAMSIZ];
833 const char *oldname;
834 int r;
835
836 oldname = udev_device_get_sysname(dev);
837
838 strscpy(name, IFNAMSIZ, event->name);
839
840 r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
841 if (r < 0)
842 return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
843
844 log_debug("renamed network interface '%s' to '%s'", oldname, name);
845
846 return 0;
847 }
848
849 void udev_event_execute_rules(struct udev_event *event,
850 usec_t timeout_usec, usec_t timeout_warn_usec,
851 struct udev_list *properties_list,
852 struct udev_rules *rules) {
853 struct udev_device *dev = event->dev;
854
855 if (udev_device_get_subsystem(dev) == NULL)
856 return;
857
858 if (streq(udev_device_get_action(dev), "remove")) {
859 udev_device_read_db(dev);
860 udev_device_tag_index(dev, NULL, false);
861 udev_device_delete_db(dev);
862
863 if (major(udev_device_get_devnum(dev)) != 0)
864 udev_watch_end(event->udev, dev);
865
866 udev_rules_apply_to_event(rules, event,
867 timeout_usec, timeout_warn_usec,
868 properties_list);
869
870 if (major(udev_device_get_devnum(dev)) != 0)
871 udev_node_remove(dev);
872 } else {
873 event->dev_db = udev_device_clone_with_db(dev);
874 if (event->dev_db != NULL) {
875 /* disable watch during event processing */
876 if (major(udev_device_get_devnum(dev)) != 0)
877 udev_watch_end(event->udev, event->dev_db);
878
879 if (major(udev_device_get_devnum(dev)) == 0 &&
880 streq(udev_device_get_action(dev), "move"))
881 udev_device_copy_properties(dev, event->dev_db);
882 }
883
884 udev_rules_apply_to_event(rules, event,
885 timeout_usec, timeout_warn_usec,
886 properties_list);
887
888 /* rename a new network interface, if needed */
889 if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
890 event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
891 int r;
892
893 r = rename_netif(event);
894 if (r < 0)
895 log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
896 udev_device_get_sysname(dev), event->name);
897 else {
898 r = udev_device_rename(dev, event->name);
899 if (r < 0)
900 log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
901 udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
902 else
903 log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
904 }
905 }
906
907 if (major(udev_device_get_devnum(dev)) > 0) {
908 bool apply;
909
910 /* remove/update possible left-over symlinks from old database entry */
911 if (event->dev_db != NULL)
912 udev_node_update_old_links(dev, event->dev_db);
913
914 if (!event->owner_set)
915 event->uid = udev_device_get_devnode_uid(dev);
916
917 if (!event->group_set)
918 event->gid = udev_device_get_devnode_gid(dev);
919
920 if (!event->mode_set) {
921 if (udev_device_get_devnode_mode(dev) > 0) {
922 /* kernel supplied value */
923 event->mode = udev_device_get_devnode_mode(dev);
924 } else if (event->gid > 0) {
925 /* default 0660 if a group is assigned */
926 event->mode = 0660;
927 } else {
928 /* default 0600 */
929 event->mode = 0600;
930 }
931 }
932
933 apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
934 udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
935 }
936
937 /* preserve old, or get new initialization timestamp */
938 udev_device_ensure_usec_initialized(event->dev, event->dev_db);
939
940 /* (re)write database file */
941 udev_device_tag_index(dev, event->dev_db, true);
942 udev_device_update_db(dev);
943 udev_device_set_is_initialized(dev);
944
945 event->dev_db = udev_device_unref(event->dev_db);
946 }
947 }
948
949 void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec) {
950 struct udev_list_entry *list_entry;
951
952 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
953 char command[UTIL_PATH_SIZE];
954 const char *cmd = udev_list_entry_get_name(list_entry);
955 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
956
957 udev_event_apply_format(event, cmd, command, sizeof(command), false);
958
959 if (builtin_cmd < UDEV_BUILTIN_MAX)
960 udev_builtin_run(event->dev, builtin_cmd, command, false);
961 else {
962 if (event->exec_delay > 0) {
963 log_debug("delay execution of '%s'", command);
964 sleep(event->exec_delay);
965 }
966
967 udev_event_spawn(event, timeout_usec, timeout_warn_usec, false, command, NULL, 0);
968 }
969 }
970 }
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