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663996b3 MS |
1 | /* |
2 | * Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org> | |
3 | * | |
4 | * This program is free software: you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation, either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <stdlib.h> | |
19 | #include <stdio.h> | |
20 | #include <stddef.h> | |
21 | #include <unistd.h> | |
22 | #include <fcntl.h> | |
23 | #include <errno.h> | |
24 | #include <ctype.h> | |
25 | #include <string.h> | |
26 | #include <time.h> | |
27 | #include <net/if.h> | |
663996b3 MS |
28 | #include <sys/prctl.h> |
29 | #include <sys/poll.h> | |
30 | #include <sys/epoll.h> | |
31 | #include <sys/wait.h> | |
663996b3 | 32 | #include <sys/signalfd.h> |
663996b3 MS |
33 | |
34 | #include "udev.h" | |
60f067b4 | 35 | #include "rtnl-util.h" |
663996b3 | 36 | |
5eef597e | 37 | struct udev_event *udev_event_new(struct udev_device *dev) { |
663996b3 MS |
38 | struct udev *udev = udev_device_get_udev(dev); |
39 | struct udev_event *event; | |
40 | ||
60f067b4 | 41 | event = new0(struct udev_event, 1); |
663996b3 MS |
42 | if (event == NULL) |
43 | return NULL; | |
44 | event->dev = dev; | |
45 | event->udev = udev; | |
46 | udev_list_init(udev, &event->run_list, false); | |
60f067b4 | 47 | udev_list_init(udev, &event->seclabel_list, false); |
663996b3 MS |
48 | event->fd_signal = -1; |
49 | event->birth_usec = now(CLOCK_MONOTONIC); | |
663996b3 MS |
50 | return event; |
51 | } | |
52 | ||
5eef597e | 53 | void udev_event_unref(struct udev_event *event) { |
663996b3 MS |
54 | if (event == NULL) |
55 | return; | |
5eef597e | 56 | sd_rtnl_unref(event->rtnl); |
663996b3 | 57 | udev_list_cleanup(&event->run_list); |
60f067b4 | 58 | udev_list_cleanup(&event->seclabel_list); |
663996b3 MS |
59 | free(event->program_result); |
60 | free(event->name); | |
61 | free(event); | |
62 | } | |
63 | ||
5eef597e | 64 | size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) { |
663996b3 MS |
65 | struct udev_device *dev = event->dev; |
66 | enum subst_type { | |
67 | SUBST_UNKNOWN, | |
68 | SUBST_DEVNODE, | |
69 | SUBST_ATTR, | |
70 | SUBST_ENV, | |
71 | SUBST_KERNEL, | |
72 | SUBST_KERNEL_NUMBER, | |
73 | SUBST_DRIVER, | |
74 | SUBST_DEVPATH, | |
75 | SUBST_ID, | |
76 | SUBST_MAJOR, | |
77 | SUBST_MINOR, | |
78 | SUBST_RESULT, | |
79 | SUBST_PARENT, | |
80 | SUBST_NAME, | |
81 | SUBST_LINKS, | |
82 | SUBST_ROOT, | |
83 | SUBST_SYS, | |
84 | }; | |
85 | static const struct subst_map { | |
86 | const char *name; | |
87 | const char fmt; | |
88 | enum subst_type type; | |
89 | } map[] = { | |
90 | { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE }, | |
91 | { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE }, | |
92 | { .name = "attr", .fmt = 's', .type = SUBST_ATTR }, | |
93 | { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR }, | |
94 | { .name = "env", .fmt = 'E', .type = SUBST_ENV }, | |
95 | { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL }, | |
96 | { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, | |
97 | { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER }, | |
98 | { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, | |
99 | { .name = "id", .fmt = 'b', .type = SUBST_ID }, | |
100 | { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, | |
101 | { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, | |
102 | { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, | |
103 | { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, | |
104 | { .name = "name", .fmt = 'D', .type = SUBST_NAME }, | |
105 | { .name = "links", .fmt = 'L', .type = SUBST_LINKS }, | |
106 | { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, | |
107 | { .name = "sys", .fmt = 'S', .type = SUBST_SYS }, | |
108 | }; | |
109 | const char *from; | |
110 | char *s; | |
111 | size_t l; | |
112 | ||
113 | from = src; | |
114 | s = dest; | |
115 | l = size; | |
116 | ||
117 | for (;;) { | |
118 | enum subst_type type = SUBST_UNKNOWN; | |
119 | char attrbuf[UTIL_PATH_SIZE]; | |
120 | char *attr = NULL; | |
121 | ||
122 | while (from[0] != '\0') { | |
123 | if (from[0] == '$') { | |
124 | /* substitute named variable */ | |
125 | unsigned int i; | |
126 | ||
127 | if (from[1] == '$') { | |
128 | from++; | |
129 | goto copy; | |
130 | } | |
131 | ||
132 | for (i = 0; i < ELEMENTSOF(map); i++) { | |
133 | if (startswith(&from[1], map[i].name)) { | |
134 | type = map[i].type; | |
135 | from += strlen(map[i].name)+1; | |
136 | goto subst; | |
137 | } | |
138 | } | |
139 | } else if (from[0] == '%') { | |
140 | /* substitute format char */ | |
141 | unsigned int i; | |
142 | ||
143 | if (from[1] == '%') { | |
144 | from++; | |
145 | goto copy; | |
146 | } | |
147 | ||
148 | for (i = 0; i < ELEMENTSOF(map); i++) { | |
149 | if (from[1] == map[i].fmt) { | |
150 | type = map[i].type; | |
151 | from += 2; | |
152 | goto subst; | |
153 | } | |
154 | } | |
155 | } | |
156 | copy: | |
157 | /* copy char */ | |
158 | if (l == 0) | |
159 | goto out; | |
160 | s[0] = from[0]; | |
161 | from++; | |
162 | s++; | |
163 | l--; | |
164 | } | |
165 | ||
166 | goto out; | |
167 | subst: | |
168 | /* extract possible $format{attr} */ | |
169 | if (from[0] == '{') { | |
170 | unsigned int i; | |
171 | ||
172 | from++; | |
173 | for (i = 0; from[i] != '}'; i++) { | |
174 | if (from[i] == '\0') { | |
60f067b4 | 175 | log_error("missing closing brace for format '%s'", src); |
663996b3 MS |
176 | goto out; |
177 | } | |
178 | } | |
179 | if (i >= sizeof(attrbuf)) | |
180 | goto out; | |
181 | memcpy(attrbuf, from, i); | |
182 | attrbuf[i] = '\0'; | |
183 | from += i+1; | |
184 | attr = attrbuf; | |
185 | } else { | |
186 | attr = NULL; | |
187 | } | |
188 | ||
189 | switch (type) { | |
190 | case SUBST_DEVPATH: | |
191 | l = strpcpy(&s, l, udev_device_get_devpath(dev)); | |
192 | break; | |
193 | case SUBST_KERNEL: | |
194 | l = strpcpy(&s, l, udev_device_get_sysname(dev)); | |
195 | break; | |
196 | case SUBST_KERNEL_NUMBER: | |
197 | if (udev_device_get_sysnum(dev) == NULL) | |
198 | break; | |
199 | l = strpcpy(&s, l, udev_device_get_sysnum(dev)); | |
200 | break; | |
201 | case SUBST_ID: | |
202 | if (event->dev_parent == NULL) | |
203 | break; | |
204 | l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent)); | |
205 | break; | |
206 | case SUBST_DRIVER: { | |
207 | const char *driver; | |
208 | ||
209 | if (event->dev_parent == NULL) | |
210 | break; | |
211 | ||
212 | driver = udev_device_get_driver(event->dev_parent); | |
213 | if (driver == NULL) | |
214 | break; | |
215 | l = strpcpy(&s, l, driver); | |
216 | break; | |
217 | } | |
218 | case SUBST_MAJOR: { | |
219 | char num[UTIL_PATH_SIZE]; | |
220 | ||
221 | sprintf(num, "%d", major(udev_device_get_devnum(dev))); | |
222 | l = strpcpy(&s, l, num); | |
223 | break; | |
224 | } | |
225 | case SUBST_MINOR: { | |
226 | char num[UTIL_PATH_SIZE]; | |
227 | ||
228 | sprintf(num, "%d", minor(udev_device_get_devnum(dev))); | |
229 | l = strpcpy(&s, l, num); | |
230 | break; | |
231 | } | |
232 | case SUBST_RESULT: { | |
233 | char *rest; | |
234 | int i; | |
235 | ||
236 | if (event->program_result == NULL) | |
237 | break; | |
238 | /* get part part of the result string */ | |
239 | i = 0; | |
240 | if (attr != NULL) | |
241 | i = strtoul(attr, &rest, 10); | |
242 | if (i > 0) { | |
243 | char result[UTIL_PATH_SIZE]; | |
244 | char tmp[UTIL_PATH_SIZE]; | |
245 | char *cpos; | |
246 | ||
247 | strscpy(result, sizeof(result), event->program_result); | |
248 | cpos = result; | |
249 | while (--i) { | |
250 | while (cpos[0] != '\0' && !isspace(cpos[0])) | |
251 | cpos++; | |
252 | while (isspace(cpos[0])) | |
253 | cpos++; | |
60f067b4 JS |
254 | if (cpos[0] == '\0') |
255 | break; | |
663996b3 MS |
256 | } |
257 | if (i > 0) { | |
60f067b4 | 258 | log_error("requested part of result string not found"); |
663996b3 MS |
259 | break; |
260 | } | |
261 | strscpy(tmp, sizeof(tmp), cpos); | |
262 | /* %{2+}c copies the whole string from the second part on */ | |
263 | if (rest[0] != '+') { | |
264 | cpos = strchr(tmp, ' '); | |
265 | if (cpos) | |
266 | cpos[0] = '\0'; | |
267 | } | |
268 | l = strpcpy(&s, l, tmp); | |
269 | } else { | |
270 | l = strpcpy(&s, l, event->program_result); | |
271 | } | |
272 | break; | |
273 | } | |
274 | case SUBST_ATTR: { | |
275 | const char *value = NULL; | |
276 | char vbuf[UTIL_NAME_SIZE]; | |
277 | size_t len; | |
278 | int count; | |
279 | ||
280 | if (attr == NULL) { | |
60f067b4 | 281 | log_error("missing file parameter for attr"); |
663996b3 MS |
282 | break; |
283 | } | |
284 | ||
285 | /* try to read the value specified by "[dmi/id]product_name" */ | |
286 | if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0) | |
287 | value = vbuf; | |
288 | ||
289 | /* try to read the attribute the device */ | |
290 | if (value == NULL) | |
291 | value = udev_device_get_sysattr_value(event->dev, attr); | |
292 | ||
293 | /* try to read the attribute of the parent device, other matches have selected */ | |
294 | if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev) | |
295 | value = udev_device_get_sysattr_value(event->dev_parent, attr); | |
296 | ||
297 | if (value == NULL) | |
298 | break; | |
299 | ||
300 | /* strip trailing whitespace, and replace unwanted characters */ | |
301 | if (value != vbuf) | |
302 | strscpy(vbuf, sizeof(vbuf), value); | |
303 | len = strlen(vbuf); | |
304 | while (len > 0 && isspace(vbuf[--len])) | |
305 | vbuf[len] = '\0'; | |
306 | count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT); | |
307 | if (count > 0) | |
60f067b4 | 308 | log_debug("%i character(s) replaced" , count); |
663996b3 MS |
309 | l = strpcpy(&s, l, vbuf); |
310 | break; | |
311 | } | |
312 | case SUBST_PARENT: { | |
313 | struct udev_device *dev_parent; | |
314 | const char *devnode; | |
315 | ||
316 | dev_parent = udev_device_get_parent(event->dev); | |
317 | if (dev_parent == NULL) | |
318 | break; | |
319 | devnode = udev_device_get_devnode(dev_parent); | |
320 | if (devnode != NULL) | |
321 | l = strpcpy(&s, l, devnode + strlen("/dev/")); | |
322 | break; | |
323 | } | |
324 | case SUBST_DEVNODE: | |
325 | if (udev_device_get_devnode(dev) != NULL) | |
326 | l = strpcpy(&s, l, udev_device_get_devnode(dev)); | |
327 | break; | |
328 | case SUBST_NAME: | |
329 | if (event->name != NULL) | |
330 | l = strpcpy(&s, l, event->name); | |
331 | else if (udev_device_get_devnode(dev) != NULL) | |
332 | l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/")); | |
333 | else | |
334 | l = strpcpy(&s, l, udev_device_get_sysname(dev)); | |
335 | break; | |
336 | case SUBST_LINKS: { | |
337 | struct udev_list_entry *list_entry; | |
338 | ||
339 | list_entry = udev_device_get_devlinks_list_entry(dev); | |
340 | if (list_entry == NULL) | |
341 | break; | |
342 | l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/")); | |
343 | udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) | |
344 | l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL); | |
345 | break; | |
346 | } | |
347 | case SUBST_ROOT: | |
348 | l = strpcpy(&s, l, "/dev"); | |
349 | break; | |
350 | case SUBST_SYS: | |
351 | l = strpcpy(&s, l, "/sys"); | |
352 | break; | |
353 | case SUBST_ENV: | |
354 | if (attr == NULL) { | |
355 | break; | |
356 | } else { | |
357 | const char *value; | |
358 | ||
359 | value = udev_device_get_property_value(event->dev, attr); | |
360 | if (value == NULL) | |
361 | break; | |
362 | l = strpcpy(&s, l, value); | |
363 | break; | |
364 | } | |
365 | default: | |
60f067b4 | 366 | log_error("unknown substitution type=%i", type); |
663996b3 MS |
367 | break; |
368 | } | |
369 | } | |
370 | ||
371 | out: | |
372 | s[0] = '\0'; | |
373 | return l; | |
374 | } | |
375 | ||
376 | static int spawn_exec(struct udev_event *event, | |
377 | const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask, | |
5eef597e MP |
378 | int fd_stdout, int fd_stderr) { |
379 | _cleanup_close_ int fd = -1; | |
663996b3 MS |
380 | |
381 | /* discard child output or connect to pipe */ | |
382 | fd = open("/dev/null", O_RDWR); | |
383 | if (fd >= 0) { | |
384 | dup2(fd, STDIN_FILENO); | |
385 | if (fd_stdout < 0) | |
386 | dup2(fd, STDOUT_FILENO); | |
387 | if (fd_stderr < 0) | |
388 | dup2(fd, STDERR_FILENO); | |
5eef597e | 389 | } else |
f47781d8 | 390 | log_error_errno(errno, "open /dev/null failed: %m"); |
663996b3 MS |
391 | |
392 | /* connect pipes to std{out,err} */ | |
393 | if (fd_stdout >= 0) { | |
394 | dup2(fd_stdout, STDOUT_FILENO); | |
5eef597e | 395 | safe_close(fd_stdout); |
663996b3 MS |
396 | } |
397 | if (fd_stderr >= 0) { | |
398 | dup2(fd_stderr, STDERR_FILENO); | |
5eef597e | 399 | safe_close(fd_stderr); |
663996b3 MS |
400 | } |
401 | ||
402 | /* terminate child in case parent goes away */ | |
403 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
404 | ||
405 | /* restore original udev sigmask before exec */ | |
406 | if (sigmask) | |
407 | sigprocmask(SIG_SETMASK, sigmask, NULL); | |
408 | ||
409 | execve(argv[0], argv, envp); | |
410 | ||
411 | /* exec failed */ | |
f47781d8 | 412 | log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd); |
5eef597e MP |
413 | |
414 | return -errno; | |
663996b3 MS |
415 | } |
416 | ||
417 | static void spawn_read(struct udev_event *event, | |
5eef597e MP |
418 | usec_t timeout_usec, |
419 | const char *cmd, | |
420 | int fd_stdout, int fd_stderr, | |
421 | char *result, size_t ressize) { | |
422 | _cleanup_close_ int fd_ep = -1; | |
423 | struct epoll_event ep_outpipe = { | |
424 | .events = EPOLLIN, | |
425 | .data.ptr = &fd_stdout, | |
426 | }; | |
427 | struct epoll_event ep_errpipe = { | |
428 | .events = EPOLLIN, | |
429 | .data.ptr = &fd_stderr, | |
430 | }; | |
663996b3 | 431 | size_t respos = 0; |
5eef597e | 432 | int r; |
663996b3 MS |
433 | |
434 | /* read from child if requested */ | |
435 | if (fd_stdout < 0 && fd_stderr < 0) | |
436 | return; | |
437 | ||
438 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
439 | if (fd_ep < 0) { | |
f47781d8 | 440 | log_error_errno(errno, "error creating epoll fd: %m"); |
5eef597e | 441 | return; |
663996b3 MS |
442 | } |
443 | ||
444 | if (fd_stdout >= 0) { | |
5eef597e MP |
445 | r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe); |
446 | if (r < 0) { | |
f47781d8 | 447 | log_error_errno(errno, "fail to add stdout fd to epoll: %m"); |
5eef597e | 448 | return; |
663996b3 MS |
449 | } |
450 | } | |
451 | ||
452 | if (fd_stderr >= 0) { | |
5eef597e MP |
453 | r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe); |
454 | if (r < 0) { | |
f47781d8 | 455 | log_error_errno(errno, "fail to add stderr fd to epoll: %m"); |
5eef597e | 456 | return; |
663996b3 MS |
457 | } |
458 | } | |
459 | ||
460 | /* read child output */ | |
461 | while (fd_stdout >= 0 || fd_stderr >= 0) { | |
462 | int timeout; | |
463 | int fdcount; | |
464 | struct epoll_event ev[4]; | |
465 | int i; | |
466 | ||
5eef597e | 467 | if (timeout_usec > 0) { |
663996b3 MS |
468 | usec_t age_usec; |
469 | ||
470 | age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; | |
5eef597e | 471 | if (age_usec >= timeout_usec) { |
60f067b4 | 472 | log_error("timeout '%s'", cmd); |
5eef597e | 473 | return; |
663996b3 | 474 | } |
5eef597e | 475 | timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; |
663996b3 MS |
476 | } else { |
477 | timeout = -1; | |
478 | } | |
479 | ||
480 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); | |
481 | if (fdcount < 0) { | |
482 | if (errno == EINTR) | |
483 | continue; | |
f47781d8 | 484 | log_error_errno(errno, "failed to poll: %m"); |
5eef597e MP |
485 | return; |
486 | } else if (fdcount == 0) { | |
60f067b4 | 487 | log_error("timeout '%s'", cmd); |
5eef597e | 488 | return; |
663996b3 MS |
489 | } |
490 | ||
491 | for (i = 0; i < fdcount; i++) { | |
492 | int *fd = (int *)ev[i].data.ptr; | |
493 | ||
5eef597e MP |
494 | if (*fd < 0) |
495 | continue; | |
496 | ||
663996b3 MS |
497 | if (ev[i].events & EPOLLIN) { |
498 | ssize_t count; | |
499 | char buf[4096]; | |
500 | ||
501 | count = read(*fd, buf, sizeof(buf)-1); | |
502 | if (count <= 0) | |
503 | continue; | |
504 | buf[count] = '\0'; | |
505 | ||
506 | /* store stdout result */ | |
507 | if (result != NULL && *fd == fd_stdout) { | |
508 | if (respos + count < ressize) { | |
509 | memcpy(&result[respos], buf, count); | |
510 | respos += count; | |
511 | } else { | |
60f067b4 | 512 | log_error("'%s' ressize %zd too short", cmd, ressize); |
663996b3 MS |
513 | } |
514 | } | |
515 | ||
516 | /* log debug output only if we watch stderr */ | |
517 | if (fd_stderr >= 0) { | |
518 | char *pos; | |
519 | char *line; | |
520 | ||
521 | pos = buf; | |
522 | while ((line = strsep(&pos, "\n"))) { | |
523 | if (pos != NULL || line[0] != '\0') | |
60f067b4 | 524 | log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line); |
663996b3 MS |
525 | } |
526 | } | |
527 | } else if (ev[i].events & EPOLLHUP) { | |
5eef597e MP |
528 | r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL); |
529 | if (r < 0) { | |
f47781d8 | 530 | log_error_errno(errno, "failed to remove fd from epoll: %m"); |
5eef597e | 531 | return; |
663996b3 MS |
532 | } |
533 | *fd = -1; | |
534 | } | |
535 | } | |
536 | } | |
537 | ||
538 | /* return the child's stdout string */ | |
539 | if (result != NULL) | |
540 | result[respos] = '\0'; | |
663996b3 MS |
541 | } |
542 | ||
5eef597e MP |
543 | static int spawn_wait(struct udev_event *event, |
544 | usec_t timeout_usec, | |
545 | usec_t timeout_warn_usec, | |
546 | const char *cmd, pid_t pid) { | |
663996b3 MS |
547 | struct pollfd pfd[1]; |
548 | int err = 0; | |
549 | ||
550 | pfd[0].events = POLLIN; | |
551 | pfd[0].fd = event->fd_signal; | |
552 | ||
553 | while (pid > 0) { | |
554 | int timeout; | |
5eef597e | 555 | int timeout_warn = 0; |
663996b3 MS |
556 | int fdcount; |
557 | ||
5eef597e | 558 | if (timeout_usec > 0) { |
663996b3 MS |
559 | usec_t age_usec; |
560 | ||
561 | age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; | |
5eef597e | 562 | if (age_usec >= timeout_usec) |
663996b3 | 563 | timeout = 1000; |
5eef597e MP |
564 | else { |
565 | if (timeout_warn_usec > 0) | |
566 | timeout_warn = ((timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; | |
567 | ||
568 | timeout = ((timeout_usec - timeout_warn_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; | |
569 | } | |
663996b3 MS |
570 | } else { |
571 | timeout = -1; | |
572 | } | |
573 | ||
5eef597e | 574 | fdcount = poll(pfd, 1, timeout_warn); |
663996b3 MS |
575 | if (fdcount < 0) { |
576 | if (errno == EINTR) | |
577 | continue; | |
578 | err = -errno; | |
f47781d8 | 579 | log_error_errno(errno, "failed to poll: %m"); |
663996b3 MS |
580 | goto out; |
581 | } | |
582 | if (fdcount == 0) { | |
5eef597e MP |
583 | log_warning("slow: '%s' [%u]", cmd, pid); |
584 | ||
585 | fdcount = poll(pfd, 1, timeout); | |
586 | if (fdcount < 0) { | |
587 | if (errno == EINTR) | |
588 | continue; | |
589 | err = -errno; | |
f47781d8 | 590 | log_error_errno(errno, "failed to poll: %m"); |
5eef597e MP |
591 | goto out; |
592 | } | |
593 | if (fdcount == 0) { | |
594 | log_error("timeout: killing '%s' [%u]", cmd, pid); | |
595 | kill(pid, SIGKILL); | |
596 | } | |
663996b3 MS |
597 | } |
598 | ||
599 | if (pfd[0].revents & POLLIN) { | |
600 | struct signalfd_siginfo fdsi; | |
601 | int status; | |
602 | ssize_t size; | |
603 | ||
604 | size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
605 | if (size != sizeof(struct signalfd_siginfo)) | |
606 | continue; | |
607 | ||
608 | switch (fdsi.ssi_signo) { | |
609 | case SIGTERM: | |
610 | event->sigterm = true; | |
611 | break; | |
612 | case SIGCHLD: | |
613 | if (waitpid(pid, &status, WNOHANG) < 0) | |
614 | break; | |
615 | if (WIFEXITED(status)) { | |
60f067b4 | 616 | log_debug("'%s' [%u] exit with return code %i", cmd, pid, WEXITSTATUS(status)); |
663996b3 MS |
617 | if (WEXITSTATUS(status) != 0) |
618 | err = -1; | |
619 | } else if (WIFSIGNALED(status)) { | |
60f067b4 | 620 | log_error("'%s' [%u] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
663996b3 MS |
621 | err = -1; |
622 | } else if (WIFSTOPPED(status)) { | |
60f067b4 | 623 | log_error("'%s' [%u] stopped", cmd, pid); |
663996b3 MS |
624 | err = -1; |
625 | } else if (WIFCONTINUED(status)) { | |
60f067b4 | 626 | log_error("'%s' [%u] continued", cmd, pid); |
663996b3 MS |
627 | err = -1; |
628 | } else { | |
60f067b4 | 629 | log_error("'%s' [%u] exit with status 0x%04x", cmd, pid, status); |
663996b3 MS |
630 | err = -1; |
631 | } | |
632 | pid = 0; | |
633 | break; | |
634 | } | |
635 | } | |
636 | } | |
637 | out: | |
638 | return err; | |
639 | } | |
640 | ||
5eef597e | 641 | int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) { |
663996b3 MS |
642 | int i = 0; |
643 | char *pos; | |
644 | ||
645 | if (strchr(cmd, ' ') == NULL) { | |
646 | argv[i++] = cmd; | |
647 | goto out; | |
648 | } | |
649 | ||
650 | pos = cmd; | |
651 | while (pos != NULL && pos[0] != '\0') { | |
652 | if (pos[0] == '\'') { | |
653 | /* do not separate quotes */ | |
654 | pos++; | |
655 | argv[i] = strsep(&pos, "\'"); | |
656 | if (pos != NULL) | |
657 | while (pos[0] == ' ') | |
658 | pos++; | |
659 | } else { | |
660 | argv[i] = strsep(&pos, " "); | |
661 | if (pos != NULL) | |
662 | while (pos[0] == ' ') | |
663 | pos++; | |
664 | } | |
665 | i++; | |
666 | } | |
667 | out: | |
668 | argv[i] = NULL; | |
669 | if (argc) | |
670 | *argc = i; | |
671 | return 0; | |
672 | } | |
673 | ||
674 | int udev_event_spawn(struct udev_event *event, | |
5eef597e MP |
675 | usec_t timeout_usec, |
676 | usec_t timeout_warn_usec, | |
663996b3 | 677 | const char *cmd, char **envp, const sigset_t *sigmask, |
5eef597e | 678 | char *result, size_t ressize) { |
663996b3 MS |
679 | int outpipe[2] = {-1, -1}; |
680 | int errpipe[2] = {-1, -1}; | |
681 | pid_t pid; | |
682 | char arg[UTIL_PATH_SIZE]; | |
683 | char *argv[128]; | |
684 | char program[UTIL_PATH_SIZE]; | |
685 | int err = 0; | |
686 | ||
687 | strscpy(arg, sizeof(arg), cmd); | |
688 | udev_build_argv(event->udev, arg, NULL, argv); | |
689 | ||
690 | /* pipes from child to parent */ | |
f47781d8 | 691 | if (result != NULL || log_get_max_level() >= LOG_INFO) { |
663996b3 MS |
692 | if (pipe2(outpipe, O_NONBLOCK) != 0) { |
693 | err = -errno; | |
f47781d8 | 694 | log_error_errno(errno, "pipe failed: %m"); |
663996b3 MS |
695 | goto out; |
696 | } | |
697 | } | |
f47781d8 | 698 | if (log_get_max_level() >= LOG_INFO) { |
663996b3 MS |
699 | if (pipe2(errpipe, O_NONBLOCK) != 0) { |
700 | err = -errno; | |
f47781d8 | 701 | log_error_errno(errno, "pipe failed: %m"); |
663996b3 MS |
702 | goto out; |
703 | } | |
704 | } | |
705 | ||
706 | /* allow programs in /usr/lib/udev/ to be called without the path */ | |
707 | if (argv[0][0] != '/') { | |
708 | strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL); | |
709 | argv[0] = program; | |
710 | } | |
711 | ||
712 | pid = fork(); | |
713 | switch(pid) { | |
714 | case 0: | |
715 | /* child closes parent's ends of pipes */ | |
716 | if (outpipe[READ_END] >= 0) { | |
717 | close(outpipe[READ_END]); | |
718 | outpipe[READ_END] = -1; | |
719 | } | |
720 | if (errpipe[READ_END] >= 0) { | |
721 | close(errpipe[READ_END]); | |
722 | errpipe[READ_END] = -1; | |
723 | } | |
724 | ||
60f067b4 | 725 | log_debug("starting '%s'", cmd); |
663996b3 MS |
726 | |
727 | spawn_exec(event, cmd, argv, envp, sigmask, | |
728 | outpipe[WRITE_END], errpipe[WRITE_END]); | |
729 | ||
730 | _exit(2 ); | |
731 | case -1: | |
f47781d8 | 732 | log_error_errno(errno, "fork of '%s' failed: %m", cmd); |
663996b3 MS |
733 | err = -1; |
734 | goto out; | |
735 | default: | |
736 | /* parent closed child's ends of pipes */ | |
737 | if (outpipe[WRITE_END] >= 0) { | |
738 | close(outpipe[WRITE_END]); | |
739 | outpipe[WRITE_END] = -1; | |
740 | } | |
741 | if (errpipe[WRITE_END] >= 0) { | |
742 | close(errpipe[WRITE_END]); | |
743 | errpipe[WRITE_END] = -1; | |
744 | } | |
745 | ||
5eef597e MP |
746 | spawn_read(event, |
747 | timeout_usec, | |
748 | cmd, | |
749 | outpipe[READ_END], errpipe[READ_END], | |
750 | result, ressize); | |
663996b3 | 751 | |
5eef597e | 752 | err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid); |
663996b3 MS |
753 | } |
754 | ||
755 | out: | |
756 | if (outpipe[READ_END] >= 0) | |
757 | close(outpipe[READ_END]); | |
758 | if (outpipe[WRITE_END] >= 0) | |
759 | close(outpipe[WRITE_END]); | |
760 | if (errpipe[READ_END] >= 0) | |
761 | close(errpipe[READ_END]); | |
762 | if (errpipe[WRITE_END] >= 0) | |
763 | close(errpipe[WRITE_END]); | |
764 | return err; | |
765 | } | |
766 | ||
5eef597e | 767 | static int rename_netif(struct udev_event *event) { |
663996b3 | 768 | struct udev_device *dev = event->dev; |
60f067b4 JS |
769 | char name[IFNAMSIZ]; |
770 | const char *oldname; | |
771 | int r; | |
663996b3 | 772 | |
60f067b4 | 773 | oldname = udev_device_get_sysname(dev); |
663996b3 | 774 | |
60f067b4 JS |
775 | strscpy(name, IFNAMSIZ, event->name); |
776 | ||
5eef597e | 777 | r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name); |
f47781d8 MP |
778 | if (r < 0) |
779 | return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name); | |
60f067b4 | 780 | |
f47781d8 | 781 | log_debug("renamed network interface '%s' to '%s'", oldname, name); |
60f067b4 | 782 | |
5eef597e | 783 | return 0; |
663996b3 MS |
784 | } |
785 | ||
5eef597e | 786 | void udev_event_execute_rules(struct udev_event *event, |
f47781d8 MP |
787 | usec_t timeout_usec, usec_t timeout_warn_usec, |
788 | struct udev_list *properties_list, | |
789 | struct udev_rules *rules, | |
790 | const sigset_t *sigmask) { | |
663996b3 | 791 | struct udev_device *dev = event->dev; |
663996b3 MS |
792 | |
793 | if (udev_device_get_subsystem(dev) == NULL) | |
60f067b4 | 794 | return; |
663996b3 MS |
795 | |
796 | if (streq(udev_device_get_action(dev), "remove")) { | |
797 | udev_device_read_db(dev, NULL); | |
798 | udev_device_delete_db(dev); | |
799 | udev_device_tag_index(dev, NULL, false); | |
800 | ||
801 | if (major(udev_device_get_devnum(dev)) != 0) | |
802 | udev_watch_end(event->udev, dev); | |
803 | ||
f47781d8 MP |
804 | udev_rules_apply_to_event(rules, event, |
805 | timeout_usec, timeout_warn_usec, | |
806 | properties_list, | |
807 | sigmask); | |
663996b3 MS |
808 | |
809 | if (major(udev_device_get_devnum(dev)) != 0) | |
810 | udev_node_remove(dev); | |
811 | } else { | |
812 | event->dev_db = udev_device_new(event->udev); | |
813 | if (event->dev_db != NULL) { | |
814 | udev_device_set_syspath(event->dev_db, udev_device_get_syspath(dev)); | |
815 | udev_device_set_subsystem(event->dev_db, udev_device_get_subsystem(dev)); | |
5eef597e | 816 | udev_device_set_devnum(event->dev_db, udev_device_get_devnum(dev)); |
663996b3 MS |
817 | udev_device_read_db(event->dev_db, NULL); |
818 | udev_device_set_info_loaded(event->dev_db); | |
819 | ||
820 | /* disable watch during event processing */ | |
821 | if (major(udev_device_get_devnum(dev)) != 0) | |
822 | udev_watch_end(event->udev, event->dev_db); | |
823 | } | |
824 | ||
5eef597e MP |
825 | if (major(udev_device_get_devnum(dev)) == 0 && |
826 | streq(udev_device_get_action(dev), "move")) { | |
827 | struct udev_list_entry *entry; | |
828 | ||
829 | for ((entry = udev_device_get_properties_list_entry(event->dev_db)); entry; entry = udev_list_entry_get_next(entry)) { | |
830 | const char *key, *value; | |
831 | struct udev_list_entry *property; | |
832 | ||
833 | key = udev_list_entry_get_name(entry); | |
834 | value = udev_list_entry_get_value(entry); | |
835 | ||
836 | property = udev_device_add_property(event->dev, key, value); | |
837 | udev_list_entry_set_num(property, true); | |
838 | } | |
839 | } | |
840 | ||
f47781d8 MP |
841 | udev_rules_apply_to_event(rules, event, |
842 | timeout_usec, timeout_warn_usec, | |
843 | properties_list, | |
844 | sigmask); | |
663996b3 MS |
845 | |
846 | /* rename a new network interface, if needed */ | |
847 | if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") && | |
848 | event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) { | |
849 | char syspath[UTIL_PATH_SIZE]; | |
850 | char *pos; | |
60f067b4 | 851 | int r; |
663996b3 | 852 | |
60f067b4 JS |
853 | r = rename_netif(event); |
854 | if (r >= 0) { | |
663996b3 MS |
855 | /* remember old name */ |
856 | udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev)); | |
857 | ||
858 | /* now change the devpath, because the kernel device name has changed */ | |
859 | strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev)); | |
860 | pos = strrchr(syspath, '/'); | |
861 | if (pos != NULL) { | |
862 | pos++; | |
863 | strscpy(pos, sizeof(syspath) - (pos - syspath), event->name); | |
864 | udev_device_set_syspath(event->dev, syspath); | |
865 | udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev)); | |
60f067b4 | 866 | log_debug("changed devpath to '%s'", udev_device_get_devpath(dev)); |
663996b3 MS |
867 | } |
868 | } | |
869 | } | |
870 | ||
871 | if (major(udev_device_get_devnum(dev)) > 0) { | |
872 | bool apply; | |
873 | ||
874 | /* remove/update possible left-over symlinks from old database entry */ | |
875 | if (event->dev_db != NULL) | |
876 | udev_node_update_old_links(dev, event->dev_db); | |
877 | ||
878 | if (!event->owner_set) | |
879 | event->uid = udev_device_get_devnode_uid(dev); | |
880 | ||
881 | if (!event->group_set) | |
882 | event->gid = udev_device_get_devnode_gid(dev); | |
883 | ||
884 | if (!event->mode_set) { | |
885 | if (udev_device_get_devnode_mode(dev) > 0) { | |
886 | /* kernel supplied value */ | |
887 | event->mode = udev_device_get_devnode_mode(dev); | |
888 | } else if (event->gid > 0) { | |
889 | /* default 0660 if a group is assigned */ | |
890 | event->mode = 0660; | |
891 | } else { | |
892 | /* default 0600 */ | |
893 | event->mode = 0600; | |
894 | } | |
895 | } | |
896 | ||
897 | apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set; | |
60f067b4 | 898 | udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list); |
663996b3 MS |
899 | } |
900 | ||
901 | /* preserve old, or get new initialization timestamp */ | |
902 | if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0) | |
903 | udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db)); | |
904 | else if (udev_device_get_usec_initialized(event->dev) == 0) | |
905 | udev_device_set_usec_initialized(event->dev, now(CLOCK_MONOTONIC)); | |
906 | ||
907 | /* (re)write database file */ | |
908 | udev_device_update_db(dev); | |
909 | udev_device_tag_index(dev, event->dev_db, true); | |
910 | udev_device_set_is_initialized(dev); | |
911 | ||
912 | udev_device_unref(event->dev_db); | |
913 | event->dev_db = NULL; | |
914 | } | |
663996b3 MS |
915 | } |
916 | ||
5eef597e | 917 | void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec, const sigset_t *sigmask) { |
663996b3 MS |
918 | struct udev_list_entry *list_entry; |
919 | ||
920 | udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) { | |
921 | const char *cmd = udev_list_entry_get_name(list_entry); | |
922 | enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry); | |
923 | ||
924 | if (builtin_cmd < UDEV_BUILTIN_MAX) { | |
925 | char command[UTIL_PATH_SIZE]; | |
926 | ||
927 | udev_event_apply_format(event, cmd, command, sizeof(command)); | |
928 | udev_builtin_run(event->dev, builtin_cmd, command, false); | |
929 | } else { | |
930 | char program[UTIL_PATH_SIZE]; | |
931 | char **envp; | |
932 | ||
933 | if (event->exec_delay > 0) { | |
60f067b4 | 934 | log_debug("delay execution of '%s'", program); |
663996b3 MS |
935 | sleep(event->exec_delay); |
936 | } | |
937 | ||
938 | udev_event_apply_format(event, cmd, program, sizeof(program)); | |
939 | envp = udev_device_get_properties_envp(event->dev); | |
5eef597e | 940 | udev_event_spawn(event, timeout_usec, timeout_warn_usec, program, envp, sigmask, NULL, 0); |
663996b3 MS |
941 | } |
942 | } | |
943 | } |