]>
Commit | Line | Data |
---|---|---|
d46f37fd | 1 | /* |
0ec5b5e1 | 2 | * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org> |
d46f37fd | 3 | * |
55e9959b KS |
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. | |
d46f37fd | 8 | * |
55e9959b KS |
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/>. | |
d46f37fd KS |
16 | */ |
17 | ||
d46f37fd KS |
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> | |
959e8b5d DM |
26 | #include <time.h> |
27 | #include <net/if.h> | |
d46f37fd | 28 | #include <sys/ioctl.h> |
2181d30a KS |
29 | #include <sys/prctl.h> |
30 | #include <sys/poll.h> | |
31 | #include <sys/epoll.h> | |
32 | #include <sys/wait.h> | |
d46f37fd | 33 | #include <sys/socket.h> |
2181d30a | 34 | #include <sys/signalfd.h> |
d46f37fd KS |
35 | #include <linux/sockios.h> |
36 | ||
37 | #include "udev.h" | |
d46f37fd | 38 | |
aa8734ff KS |
39 | struct udev_event *udev_event_new(struct udev_device *dev) |
40 | { | |
912541b0 KS |
41 | struct udev *udev = udev_device_get_udev(dev); |
42 | struct udev_event *event; | |
43 | ||
44 | event = calloc(1, sizeof(struct udev_event)); | |
45 | if (event == NULL) | |
46 | return NULL; | |
47 | event->dev = dev; | |
48 | event->udev = udev; | |
49 | udev_list_init(udev, &event->run_list, false); | |
50 | event->fd_signal = -1; | |
51 | event->birth_usec = now_usec(); | |
e64fae55 | 52 | event->timeout_usec = 30 * 1000 * 1000; |
912541b0 | 53 | return event; |
aa8734ff KS |
54 | } |
55 | ||
56 | void udev_event_unref(struct udev_event *event) | |
57 | { | |
912541b0 KS |
58 | if (event == NULL) |
59 | return; | |
60 | udev_list_cleanup(&event->run_list); | |
61 | free(event->program_result); | |
62 | free(event->name); | |
912541b0 | 63 | free(event); |
aa8734ff KS |
64 | } |
65 | ||
065db052 | 66 | size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) |
f1128767 | 67 | { |
912541b0 KS |
68 | struct udev_device *dev = event->dev; |
69 | enum subst_type { | |
70 | SUBST_UNKNOWN, | |
71 | SUBST_DEVNODE, | |
72 | SUBST_ATTR, | |
73 | SUBST_ENV, | |
74 | SUBST_KERNEL, | |
75 | SUBST_KERNEL_NUMBER, | |
76 | SUBST_DRIVER, | |
77 | SUBST_DEVPATH, | |
78 | SUBST_ID, | |
79 | SUBST_MAJOR, | |
80 | SUBST_MINOR, | |
81 | SUBST_RESULT, | |
82 | SUBST_PARENT, | |
83 | SUBST_NAME, | |
84 | SUBST_LINKS, | |
85 | SUBST_ROOT, | |
86 | SUBST_SYS, | |
87 | }; | |
88 | static const struct subst_map { | |
04a9d3a0 KS |
89 | const char *name; |
90 | const char fmt; | |
912541b0 KS |
91 | enum subst_type type; |
92 | } map[] = { | |
93 | { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE }, | |
94 | { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE }, | |
95 | { .name = "attr", .fmt = 's', .type = SUBST_ATTR }, | |
96 | { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR }, | |
97 | { .name = "env", .fmt = 'E', .type = SUBST_ENV }, | |
98 | { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL }, | |
99 | { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, | |
100 | { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER }, | |
101 | { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, | |
102 | { .name = "id", .fmt = 'b', .type = SUBST_ID }, | |
103 | { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, | |
104 | { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, | |
105 | { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, | |
106 | { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, | |
107 | { .name = "name", .fmt = 'D', .type = SUBST_NAME }, | |
108 | { .name = "links", .fmt = 'L', .type = SUBST_LINKS }, | |
109 | { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, | |
110 | { .name = "sys", .fmt = 'S', .type = SUBST_SYS }, | |
111 | }; | |
112 | const char *from; | |
113 | char *s; | |
114 | size_t l; | |
115 | ||
116 | from = src; | |
117 | s = dest; | |
118 | l = size; | |
119 | ||
120 | for (;;) { | |
121 | enum subst_type type = SUBST_UNKNOWN; | |
122 | char attrbuf[UTIL_PATH_SIZE]; | |
123 | char *attr = NULL; | |
124 | ||
125 | while (from[0] != '\0') { | |
126 | if (from[0] == '$') { | |
127 | /* substitute named variable */ | |
128 | unsigned int i; | |
129 | ||
130 | if (from[1] == '$') { | |
131 | from++; | |
132 | goto copy; | |
133 | } | |
134 | ||
8fef0ff2 | 135 | for (i = 0; i < ELEMENTSOF(map); i++) { |
33502ffe | 136 | if (startswith(&from[1], map[i].name)) { |
912541b0 KS |
137 | type = map[i].type; |
138 | from += strlen(map[i].name)+1; | |
912541b0 KS |
139 | goto subst; |
140 | } | |
141 | } | |
142 | } else if (from[0] == '%') { | |
143 | /* substitute format char */ | |
144 | unsigned int i; | |
145 | ||
146 | if (from[1] == '%') { | |
147 | from++; | |
148 | goto copy; | |
149 | } | |
150 | ||
8fef0ff2 | 151 | for (i = 0; i < ELEMENTSOF(map); i++) { |
912541b0 KS |
152 | if (from[1] == map[i].fmt) { |
153 | type = map[i].type; | |
154 | from += 2; | |
912541b0 KS |
155 | goto subst; |
156 | } | |
157 | } | |
158 | } | |
065db052 | 159 | copy: |
912541b0 KS |
160 | /* copy char */ |
161 | if (l == 0) | |
162 | goto out; | |
163 | s[0] = from[0]; | |
164 | from++; | |
165 | s++; | |
166 | l--; | |
167 | } | |
168 | ||
169 | goto out; | |
065db052 | 170 | subst: |
912541b0 KS |
171 | /* extract possible $format{attr} */ |
172 | if (from[0] == '{') { | |
173 | unsigned int i; | |
174 | ||
175 | from++; | |
176 | for (i = 0; from[i] != '}'; i++) { | |
177 | if (from[i] == '\0') { | |
baa30fbc | 178 | log_error("missing closing brace for format '%s'\n", src); |
912541b0 KS |
179 | goto out; |
180 | } | |
181 | } | |
182 | if (i >= sizeof(attrbuf)) | |
183 | goto out; | |
184 | memcpy(attrbuf, from, i); | |
185 | attrbuf[i] = '\0'; | |
186 | from += i+1; | |
187 | attr = attrbuf; | |
188 | } else { | |
189 | attr = NULL; | |
190 | } | |
191 | ||
192 | switch (type) { | |
193 | case SUBST_DEVPATH: | |
194 | l = util_strpcpy(&s, l, udev_device_get_devpath(dev)); | |
912541b0 KS |
195 | break; |
196 | case SUBST_KERNEL: | |
197 | l = util_strpcpy(&s, l, udev_device_get_sysname(dev)); | |
912541b0 KS |
198 | break; |
199 | case SUBST_KERNEL_NUMBER: | |
200 | if (udev_device_get_sysnum(dev) == NULL) | |
201 | break; | |
202 | l = util_strpcpy(&s, l, udev_device_get_sysnum(dev)); | |
912541b0 KS |
203 | break; |
204 | case SUBST_ID: | |
205 | if (event->dev_parent == NULL) | |
206 | break; | |
207 | l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent)); | |
912541b0 KS |
208 | break; |
209 | case SUBST_DRIVER: { | |
210 | const char *driver; | |
211 | ||
212 | if (event->dev_parent == NULL) | |
213 | break; | |
214 | ||
215 | driver = udev_device_get_driver(event->dev_parent); | |
216 | if (driver == NULL) | |
217 | break; | |
218 | l = util_strpcpy(&s, l, driver); | |
912541b0 KS |
219 | break; |
220 | } | |
221 | case SUBST_MAJOR: { | |
222 | char num[UTIL_PATH_SIZE]; | |
223 | ||
224 | sprintf(num, "%d", major(udev_device_get_devnum(dev))); | |
225 | l = util_strpcpy(&s, l, num); | |
912541b0 KS |
226 | break; |
227 | } | |
228 | case SUBST_MINOR: { | |
229 | char num[UTIL_PATH_SIZE]; | |
230 | ||
231 | sprintf(num, "%d", minor(udev_device_get_devnum(dev))); | |
232 | l = util_strpcpy(&s, l, num); | |
912541b0 KS |
233 | break; |
234 | } | |
235 | case SUBST_RESULT: { | |
236 | char *rest; | |
237 | int i; | |
238 | ||
239 | if (event->program_result == NULL) | |
240 | break; | |
241 | /* get part part of the result string */ | |
242 | i = 0; | |
243 | if (attr != NULL) | |
244 | i = strtoul(attr, &rest, 10); | |
245 | if (i > 0) { | |
246 | char result[UTIL_PATH_SIZE]; | |
247 | char tmp[UTIL_PATH_SIZE]; | |
248 | char *cpos; | |
249 | ||
912541b0 KS |
250 | util_strscpy(result, sizeof(result), event->program_result); |
251 | cpos = result; | |
252 | while (--i) { | |
253 | while (cpos[0] != '\0' && !isspace(cpos[0])) | |
254 | cpos++; | |
255 | while (isspace(cpos[0])) | |
256 | cpos++; | |
257 | } | |
258 | if (i > 0) { | |
baa30fbc | 259 | log_error("requested part of result string not found\n"); |
912541b0 KS |
260 | break; |
261 | } | |
262 | util_strscpy(tmp, sizeof(tmp), cpos); | |
263 | /* %{2+}c copies the whole string from the second part on */ | |
264 | if (rest[0] != '+') { | |
265 | cpos = strchr(tmp, ' '); | |
266 | if (cpos) | |
267 | cpos[0] = '\0'; | |
268 | } | |
269 | l = util_strpcpy(&s, l, tmp); | |
912541b0 KS |
270 | } else { |
271 | l = util_strpcpy(&s, l, event->program_result); | |
912541b0 KS |
272 | } |
273 | break; | |
274 | } | |
275 | case SUBST_ATTR: { | |
276 | const char *value = NULL; | |
277 | char vbuf[UTIL_NAME_SIZE]; | |
278 | size_t len; | |
279 | int count; | |
280 | ||
281 | if (attr == NULL) { | |
baa30fbc | 282 | log_error("missing file parameter for attr\n"); |
912541b0 KS |
283 | break; |
284 | } | |
285 | ||
286 | /* try to read the value specified by "[dmi/id]product_name" */ | |
287 | if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0) | |
288 | value = vbuf; | |
289 | ||
290 | /* try to read the attribute the device */ | |
291 | if (value == NULL) | |
292 | value = udev_device_get_sysattr_value(event->dev, attr); | |
293 | ||
294 | /* try to read the attribute of the parent device, other matches have selected */ | |
295 | if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev) | |
296 | value = udev_device_get_sysattr_value(event->dev_parent, attr); | |
297 | ||
298 | if (value == NULL) | |
299 | break; | |
300 | ||
301 | /* strip trailing whitespace, and replace unwanted characters */ | |
302 | if (value != vbuf) | |
303 | util_strscpy(vbuf, sizeof(vbuf), value); | |
304 | len = strlen(vbuf); | |
305 | while (len > 0 && isspace(vbuf[--len])) | |
306 | vbuf[len] = '\0'; | |
307 | count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT); | |
308 | if (count > 0) | |
baa30fbc | 309 | log_debug("%i character(s) replaced\n" , count); |
912541b0 | 310 | l = util_strpcpy(&s, l, vbuf); |
912541b0 KS |
311 | break; |
312 | } | |
313 | case SUBST_PARENT: { | |
314 | struct udev_device *dev_parent; | |
315 | const char *devnode; | |
316 | ||
317 | dev_parent = udev_device_get_parent(event->dev); | |
318 | if (dev_parent == NULL) | |
319 | break; | |
320 | devnode = udev_device_get_devnode(dev_parent); | |
6ada823a KS |
321 | if (devnode != NULL) |
322 | l = util_strpcpy(&s, l, devnode + strlen(TEST_PREFIX "/dev/")); | |
912541b0 KS |
323 | break; |
324 | } | |
325 | case SUBST_DEVNODE: | |
326 | if (udev_device_get_devnode(dev) != NULL) | |
327 | l = util_strpcpy(&s, l, udev_device_get_devnode(dev)); | |
328 | break; | |
6ada823a KS |
329 | case SUBST_NAME: |
330 | if (event->name != NULL) | |
912541b0 | 331 | l = util_strpcpy(&s, l, event->name); |
6ada823a KS |
332 | else if (udev_device_get_devnode(dev) != NULL) |
333 | l = util_strpcpy(&s, l, udev_device_get_devnode(dev) + strlen(TEST_PREFIX "/dev/")); | |
334 | else | |
e605cf77 | 335 | l = util_strpcpy(&s, l, udev_device_get_sysname(dev)); |
912541b0 KS |
336 | break; |
337 | case SUBST_LINKS: { | |
912541b0 KS |
338 | struct udev_list_entry *list_entry; |
339 | ||
340 | list_entry = udev_device_get_devlinks_list_entry(dev); | |
341 | if (list_entry == NULL) | |
342 | break; | |
6ada823a | 343 | l = util_strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/")); |
912541b0 | 344 | udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) |
6ada823a | 345 | l = util_strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen(TEST_PREFIX "/dev/"), NULL); |
912541b0 KS |
346 | break; |
347 | } | |
348 | case SUBST_ROOT: | |
6ada823a | 349 | l = util_strpcpy(&s, l, TEST_PREFIX "/dev"); |
912541b0 KS |
350 | break; |
351 | case SUBST_SYS: | |
6ada823a | 352 | l = util_strpcpy(&s, l, TEST_PREFIX "/sys"); |
912541b0 KS |
353 | break; |
354 | case SUBST_ENV: | |
355 | if (attr == NULL) { | |
912541b0 KS |
356 | break; |
357 | } else { | |
358 | const char *value; | |
359 | ||
360 | value = udev_device_get_property_value(event->dev, attr); | |
361 | if (value == NULL) | |
362 | break; | |
912541b0 KS |
363 | l = util_strpcpy(&s, l, value); |
364 | break; | |
365 | } | |
366 | default: | |
baa30fbc | 367 | log_error("unknown substitution type=%i\n", type); |
912541b0 KS |
368 | break; |
369 | } | |
370 | } | |
065db052 KS |
371 | |
372 | out: | |
912541b0 | 373 | s[0] = '\0'; |
912541b0 | 374 | return l; |
f1128767 KS |
375 | } |
376 | ||
2181d30a | 377 | static int spawn_exec(struct udev_event *event, |
912541b0 KS |
378 | const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask, |
379 | int fd_stdout, int fd_stderr) | |
2181d30a | 380 | { |
912541b0 KS |
381 | int err; |
382 | int fd; | |
383 | ||
384 | /* discard child output or connect to pipe */ | |
385 | fd = open("/dev/null", O_RDWR); | |
386 | if (fd >= 0) { | |
387 | dup2(fd, STDIN_FILENO); | |
388 | if (fd_stdout < 0) | |
389 | dup2(fd, STDOUT_FILENO); | |
390 | if (fd_stderr < 0) | |
391 | dup2(fd, STDERR_FILENO); | |
392 | close(fd); | |
393 | } else { | |
baa30fbc | 394 | log_error("open /dev/null failed: %m\n"); |
912541b0 KS |
395 | } |
396 | ||
397 | /* connect pipes to std{out,err} */ | |
398 | if (fd_stdout >= 0) { | |
399 | dup2(fd_stdout, STDOUT_FILENO); | |
400 | close(fd_stdout); | |
401 | } | |
402 | if (fd_stderr >= 0) { | |
403 | dup2(fd_stderr, STDERR_FILENO); | |
404 | close(fd_stderr); | |
405 | } | |
406 | ||
407 | /* terminate child in case parent goes away */ | |
408 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
409 | ||
410 | /* restore original udev sigmask before exec */ | |
411 | if (sigmask) | |
412 | sigprocmask(SIG_SETMASK, sigmask, NULL); | |
413 | ||
414 | execve(argv[0], argv, envp); | |
415 | ||
416 | /* exec failed */ | |
417 | err = -errno; | |
baa30fbc | 418 | log_error("failed to execute '%s' '%s': %m\n", argv[0], cmd); |
912541b0 | 419 | return err; |
2181d30a KS |
420 | } |
421 | ||
f18f225c | 422 | static void spawn_read(struct udev_event *event, |
912541b0 KS |
423 | const char *cmd, |
424 | int fd_stdout, int fd_stderr, | |
425 | char *result, size_t ressize) | |
2181d30a | 426 | { |
912541b0 KS |
427 | size_t respos = 0; |
428 | int fd_ep = -1; | |
429 | struct epoll_event ep_outpipe, ep_errpipe; | |
430 | ||
431 | /* read from child if requested */ | |
432 | if (fd_stdout < 0 && fd_stderr < 0) | |
433 | return; | |
434 | ||
435 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
436 | if (fd_ep < 0) { | |
baa30fbc | 437 | log_error("error creating epoll fd: %m\n"); |
912541b0 KS |
438 | goto out; |
439 | } | |
440 | ||
441 | if (fd_stdout >= 0) { | |
442 | memset(&ep_outpipe, 0, sizeof(struct epoll_event)); | |
443 | ep_outpipe.events = EPOLLIN; | |
444 | ep_outpipe.data.ptr = &fd_stdout; | |
445 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) { | |
baa30fbc | 446 | log_error("fail to add fd to epoll: %m\n"); |
912541b0 KS |
447 | goto out; |
448 | } | |
449 | } | |
450 | ||
451 | if (fd_stderr >= 0) { | |
452 | memset(&ep_errpipe, 0, sizeof(struct epoll_event)); | |
453 | ep_errpipe.events = EPOLLIN; | |
454 | ep_errpipe.data.ptr = &fd_stderr; | |
455 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) { | |
baa30fbc | 456 | log_error("fail to add fd to epoll: %m\n"); |
912541b0 KS |
457 | goto out; |
458 | } | |
459 | } | |
460 | ||
461 | /* read child output */ | |
462 | while (fd_stdout >= 0 || fd_stderr >= 0) { | |
463 | int timeout; | |
464 | int fdcount; | |
465 | struct epoll_event ev[4]; | |
466 | int i; | |
467 | ||
468 | if (event->timeout_usec > 0) { | |
469 | unsigned long long age_usec; | |
470 | ||
471 | age_usec = now_usec() - event->birth_usec; | |
472 | if (age_usec >= event->timeout_usec) { | |
baa30fbc | 473 | log_error("timeout '%s'\n", cmd); |
912541b0 KS |
474 | goto out; |
475 | } | |
476 | timeout = ((event->timeout_usec - age_usec) / 1000) + 1000; | |
477 | } else { | |
478 | timeout = -1; | |
479 | } | |
480 | ||
8fef0ff2 | 481 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); |
912541b0 KS |
482 | if (fdcount < 0) { |
483 | if (errno == EINTR) | |
484 | continue; | |
baa30fbc | 485 | log_error("failed to poll: %m\n"); |
912541b0 KS |
486 | goto out; |
487 | } | |
488 | if (fdcount == 0) { | |
baa30fbc | 489 | log_error("timeout '%s'\n", cmd); |
912541b0 KS |
490 | goto out; |
491 | } | |
492 | ||
493 | for (i = 0; i < fdcount; i++) { | |
494 | int *fd = (int *)ev[i].data.ptr; | |
495 | ||
496 | if (ev[i].events & EPOLLIN) { | |
497 | ssize_t count; | |
498 | char buf[4096]; | |
499 | ||
500 | count = read(*fd, buf, sizeof(buf)-1); | |
501 | if (count <= 0) | |
502 | continue; | |
503 | buf[count] = '\0'; | |
504 | ||
505 | /* store stdout result */ | |
506 | if (result != NULL && *fd == fd_stdout) { | |
507 | if (respos + count < ressize) { | |
508 | memcpy(&result[respos], buf, count); | |
509 | respos += count; | |
510 | } else { | |
baa30fbc | 511 | log_error("'%s' ressize %zd too short\n", cmd, ressize); |
912541b0 KS |
512 | } |
513 | } | |
514 | ||
515 | /* log debug output only if we watch stderr */ | |
516 | if (fd_stderr >= 0) { | |
517 | char *pos; | |
518 | char *line; | |
519 | ||
520 | pos = buf; | |
521 | while ((line = strsep(&pos, "\n"))) { | |
522 | if (pos != NULL || line[0] != '\0') | |
baa30fbc | 523 | log_debug("'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line); |
912541b0 KS |
524 | } |
525 | } | |
526 | } else if (ev[i].events & EPOLLHUP) { | |
527 | if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) { | |
baa30fbc | 528 | log_error("failed to remove fd from epoll: %m\n"); |
912541b0 KS |
529 | goto out; |
530 | } | |
531 | *fd = -1; | |
532 | } | |
533 | } | |
534 | } | |
535 | ||
536 | /* return the child's stdout string */ | |
baa30fbc | 537 | if (result != NULL) |
912541b0 | 538 | result[respos] = '\0'; |
2181d30a | 539 | out: |
912541b0 KS |
540 | if (fd_ep >= 0) |
541 | close(fd_ep); | |
2181d30a KS |
542 | } |
543 | ||
544 | static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid) | |
545 | { | |
912541b0 KS |
546 | struct pollfd pfd[1]; |
547 | int err = 0; | |
548 | ||
549 | pfd[0].events = POLLIN; | |
550 | pfd[0].fd = event->fd_signal; | |
551 | ||
552 | while (pid > 0) { | |
553 | int timeout; | |
554 | int fdcount; | |
555 | ||
556 | if (event->timeout_usec > 0) { | |
557 | unsigned long long age_usec; | |
558 | ||
559 | age_usec = now_usec() - event->birth_usec; | |
560 | if (age_usec >= event->timeout_usec) | |
561 | timeout = 1000; | |
562 | else | |
563 | timeout = ((event->timeout_usec - age_usec) / 1000) + 1000; | |
564 | } else { | |
565 | timeout = -1; | |
566 | } | |
567 | ||
568 | fdcount = poll(pfd, 1, timeout); | |
569 | if (fdcount < 0) { | |
570 | if (errno == EINTR) | |
571 | continue; | |
572 | err = -errno; | |
baa30fbc | 573 | log_error("failed to poll: %m\n"); |
912541b0 KS |
574 | goto out; |
575 | } | |
576 | if (fdcount == 0) { | |
baa30fbc | 577 | log_error("timeout: killing '%s' [%u]\n", cmd, pid); |
912541b0 KS |
578 | kill(pid, SIGKILL); |
579 | } | |
580 | ||
581 | if (pfd[0].revents & POLLIN) { | |
582 | struct signalfd_siginfo fdsi; | |
583 | int status; | |
584 | ssize_t size; | |
585 | ||
586 | size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
587 | if (size != sizeof(struct signalfd_siginfo)) | |
588 | continue; | |
589 | ||
590 | switch (fdsi.ssi_signo) { | |
591 | case SIGTERM: | |
592 | event->sigterm = true; | |
593 | break; | |
594 | case SIGCHLD: | |
595 | if (waitpid(pid, &status, WNOHANG) < 0) | |
596 | break; | |
597 | if (WIFEXITED(status)) { | |
baa30fbc | 598 | log_debug("'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status)); |
912541b0 KS |
599 | if (WEXITSTATUS(status) != 0) |
600 | err = -1; | |
601 | } else if (WIFSIGNALED(status)) { | |
baa30fbc | 602 | log_error("'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
912541b0 KS |
603 | err = -1; |
604 | } else if (WIFSTOPPED(status)) { | |
baa30fbc | 605 | log_error("'%s' [%u] stopped\n", cmd, pid); |
912541b0 KS |
606 | err = -1; |
607 | } else if (WIFCONTINUED(status)) { | |
baa30fbc | 608 | log_error("'%s' [%u] continued\n", cmd, pid); |
912541b0 KS |
609 | err = -1; |
610 | } else { | |
baa30fbc | 611 | log_error("'%s' [%u] exit with status 0x%04x\n", cmd, pid, status); |
912541b0 KS |
612 | err = -1; |
613 | } | |
614 | pid = 0; | |
615 | break; | |
616 | } | |
617 | } | |
618 | } | |
2181d30a | 619 | out: |
912541b0 | 620 | return err; |
2181d30a KS |
621 | } |
622 | ||
e216e514 KS |
623 | int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) |
624 | { | |
912541b0 KS |
625 | int i = 0; |
626 | char *pos; | |
627 | ||
628 | if (strchr(cmd, ' ') == NULL) { | |
629 | argv[i++] = cmd; | |
630 | goto out; | |
631 | } | |
632 | ||
633 | pos = cmd; | |
634 | while (pos != NULL && pos[0] != '\0') { | |
635 | if (pos[0] == '\'') { | |
636 | /* do not separate quotes */ | |
637 | pos++; | |
638 | argv[i] = strsep(&pos, "\'"); | |
639 | if (pos != NULL) | |
640 | while (pos[0] == ' ') | |
641 | pos++; | |
642 | } else { | |
643 | argv[i] = strsep(&pos, " "); | |
644 | if (pos != NULL) | |
645 | while (pos[0] == ' ') | |
646 | pos++; | |
647 | } | |
912541b0 KS |
648 | i++; |
649 | } | |
e216e514 | 650 | out: |
912541b0 KS |
651 | argv[i] = NULL; |
652 | if (argc) | |
653 | *argc = i; | |
654 | return 0; | |
e216e514 KS |
655 | } |
656 | ||
2181d30a | 657 | int udev_event_spawn(struct udev_event *event, |
912541b0 KS |
658 | const char *cmd, char **envp, const sigset_t *sigmask, |
659 | char *result, size_t ressize) | |
2181d30a | 660 | { |
912541b0 KS |
661 | struct udev *udev = event->udev; |
662 | int outpipe[2] = {-1, -1}; | |
663 | int errpipe[2] = {-1, -1}; | |
664 | pid_t pid; | |
665 | char arg[UTIL_PATH_SIZE]; | |
666 | char *argv[128]; | |
667 | char program[UTIL_PATH_SIZE]; | |
668 | int err = 0; | |
669 | ||
670 | util_strscpy(arg, sizeof(arg), cmd); | |
671 | udev_build_argv(event->udev, arg, NULL, argv); | |
672 | ||
673 | /* pipes from child to parent */ | |
674 | if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) { | |
675 | if (pipe2(outpipe, O_NONBLOCK) != 0) { | |
676 | err = -errno; | |
baa30fbc | 677 | log_error("pipe failed: %m\n"); |
912541b0 KS |
678 | goto out; |
679 | } | |
680 | } | |
681 | if (udev_get_log_priority(udev) >= LOG_INFO) { | |
682 | if (pipe2(errpipe, O_NONBLOCK) != 0) { | |
683 | err = -errno; | |
baa30fbc | 684 | log_error("pipe failed: %m\n"); |
912541b0 KS |
685 | goto out; |
686 | } | |
687 | } | |
688 | ||
689 | /* allow programs in /usr/lib/udev/ to be called without the path */ | |
690 | if (argv[0][0] != '/') { | |
3e214785 | 691 | util_strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL); |
912541b0 KS |
692 | argv[0] = program; |
693 | } | |
694 | ||
695 | pid = fork(); | |
696 | switch(pid) { | |
697 | case 0: | |
698 | /* child closes parent's ends of pipes */ | |
699 | if (outpipe[READ_END] >= 0) { | |
700 | close(outpipe[READ_END]); | |
701 | outpipe[READ_END] = -1; | |
702 | } | |
703 | if (errpipe[READ_END] >= 0) { | |
704 | close(errpipe[READ_END]); | |
705 | errpipe[READ_END] = -1; | |
706 | } | |
707 | ||
baa30fbc | 708 | log_debug("starting '%s'\n", cmd); |
912541b0 | 709 | |
b49d9b50 KS |
710 | spawn_exec(event, cmd, argv, envp, sigmask, |
711 | outpipe[WRITE_END], errpipe[WRITE_END]); | |
912541b0 KS |
712 | |
713 | _exit(2 ); | |
714 | case -1: | |
baa30fbc | 715 | log_error("fork of '%s' failed: %m\n", cmd); |
912541b0 KS |
716 | err = -1; |
717 | goto out; | |
718 | default: | |
719 | /* parent closed child's ends of pipes */ | |
720 | if (outpipe[WRITE_END] >= 0) { | |
721 | close(outpipe[WRITE_END]); | |
722 | outpipe[WRITE_END] = -1; | |
723 | } | |
724 | if (errpipe[WRITE_END] >= 0) { | |
725 | close(errpipe[WRITE_END]); | |
726 | errpipe[WRITE_END] = -1; | |
727 | } | |
728 | ||
729 | spawn_read(event, cmd, | |
730 | outpipe[READ_END], errpipe[READ_END], | |
731 | result, ressize); | |
732 | ||
733 | err = spawn_wait(event, cmd, pid); | |
734 | } | |
2181d30a KS |
735 | |
736 | out: | |
912541b0 KS |
737 | if (outpipe[READ_END] >= 0) |
738 | close(outpipe[READ_END]); | |
739 | if (outpipe[WRITE_END] >= 0) | |
740 | close(outpipe[WRITE_END]); | |
741 | if (errpipe[READ_END] >= 0) | |
742 | close(errpipe[READ_END]); | |
743 | if (errpipe[WRITE_END] >= 0) | |
744 | close(errpipe[WRITE_END]); | |
745 | return err; | |
2181d30a KS |
746 | } |
747 | ||
aa8734ff | 748 | static int rename_netif(struct udev_event *event) |
d46f37fd | 749 | { |
912541b0 KS |
750 | struct udev_device *dev = event->dev; |
751 | int sk; | |
752 | struct ifreq ifr; | |
912541b0 KS |
753 | int err; |
754 | ||
baa30fbc KS |
755 | log_debug("changing net interface name from '%s' to '%s'\n", |
756 | udev_device_get_sysname(dev), event->name); | |
912541b0 KS |
757 | |
758 | sk = socket(PF_INET, SOCK_DGRAM, 0); | |
759 | if (sk < 0) { | |
760 | err = -errno; | |
baa30fbc | 761 | log_error("error opening socket: %m\n"); |
912541b0 KS |
762 | return err; |
763 | } | |
764 | ||
765 | memset(&ifr, 0x00, sizeof(struct ifreq)); | |
766 | util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev)); | |
767 | util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name); | |
768 | err = ioctl(sk, SIOCSIFNAME, &ifr); | |
97595710 KS |
769 | if (err >= 0) { |
770 | FILE *f; | |
771 | ||
772 | f = fopen("/dev/kmsg", "we"); | |
773 | if (f != NULL) { | |
774 | fprintf(f, "<30>systemd-udevd[%u]: renamed network interface %s to %s\n", | |
775 | getpid(), ifr.ifr_name, ifr.ifr_newname); | |
776 | fclose(f); | |
912541b0 | 777 | } |
97595710 | 778 | } else { |
912541b0 | 779 | err = -errno; |
baa30fbc | 780 | log_error("error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname); |
97595710 | 781 | } |
912541b0 KS |
782 | close(sk); |
783 | return err; | |
d46f37fd KS |
784 | } |
785 | ||
2181d30a | 786 | int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask) |
d46f37fd | 787 | { |
912541b0 KS |
788 | struct udev_device *dev = event->dev; |
789 | int err = 0; | |
790 | ||
791 | if (udev_device_get_subsystem(dev) == NULL) | |
792 | return -1; | |
793 | ||
794 | if (strcmp(udev_device_get_action(dev), "remove") == 0) { | |
795 | udev_device_read_db(dev, NULL); | |
796 | udev_device_delete_db(dev); | |
797 | udev_device_tag_index(dev, NULL, false); | |
798 | ||
799 | if (major(udev_device_get_devnum(dev)) != 0) | |
800 | udev_watch_end(event->udev, dev); | |
801 | ||
802 | udev_rules_apply_to_event(rules, event, sigmask); | |
803 | ||
804 | if (major(udev_device_get_devnum(dev)) != 0) | |
e7f32890 | 805 | udev_node_remove(dev); |
912541b0 KS |
806 | } else { |
807 | event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev)); | |
808 | if (event->dev_db != NULL) { | |
809 | udev_device_read_db(event->dev_db, NULL); | |
810 | udev_device_set_info_loaded(event->dev_db); | |
811 | ||
812 | /* disable watch during event processing */ | |
813 | if (major(udev_device_get_devnum(dev)) != 0) | |
814 | udev_watch_end(event->udev, event->dev_db); | |
815 | } | |
816 | ||
817 | udev_rules_apply_to_event(rules, event, sigmask); | |
818 | ||
819 | /* rename a new network interface, if needed */ | |
820 | if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 && | |
821 | event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) { | |
822 | char syspath[UTIL_PATH_SIZE]; | |
823 | char *pos; | |
824 | ||
825 | err = rename_netif(event); | |
826 | if (err == 0) { | |
baa30fbc | 827 | log_debug("renamed netif to '%s'\n", event->name); |
912541b0 KS |
828 | |
829 | /* remember old name */ | |
830 | udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev)); | |
831 | ||
832 | /* now change the devpath, because the kernel device name has changed */ | |
833 | util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev)); | |
834 | pos = strrchr(syspath, '/'); | |
835 | if (pos != NULL) { | |
836 | pos++; | |
837 | util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name); | |
838 | udev_device_set_syspath(event->dev, syspath); | |
839 | udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev)); | |
baa30fbc | 840 | log_debug("changed devpath to '%s'\n", udev_device_get_devpath(dev)); |
912541b0 KS |
841 | } |
842 | } | |
843 | } | |
844 | ||
b0a00806 | 845 | if (major(udev_device_get_devnum(dev)) > 0) { |
912541b0 KS |
846 | /* remove/update possible left-over symlinks from old database entry */ |
847 | if (event->dev_db != NULL) | |
848 | udev_node_update_old_links(dev, event->dev_db); | |
849 | ||
850 | if (!event->mode_set) { | |
851 | if (udev_device_get_devnode_mode(dev) > 0) { | |
852 | /* kernel supplied value */ | |
853 | event->mode = udev_device_get_devnode_mode(dev); | |
854 | } else if (event->gid > 0) { | |
855 | /* default 0660 if a group is assigned */ | |
856 | event->mode = 0660; | |
857 | } else { | |
858 | /* default 0600 */ | |
859 | event->mode = 0600; | |
860 | } | |
861 | } | |
862 | ||
e7f32890 | 863 | udev_node_add(dev, event->mode, event->uid, event->gid); |
912541b0 KS |
864 | } |
865 | ||
866 | /* preserve old, or get new initialization timestamp */ | |
867 | if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0) | |
868 | udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db)); | |
869 | else if (udev_device_get_usec_initialized(event->dev) == 0) | |
870 | udev_device_set_usec_initialized(event->dev, now_usec()); | |
871 | ||
872 | /* (re)write database file */ | |
873 | udev_device_update_db(dev); | |
874 | udev_device_tag_index(dev, event->dev_db, true); | |
875 | udev_device_set_is_initialized(dev); | |
876 | ||
877 | udev_device_unref(event->dev_db); | |
878 | event->dev_db = NULL; | |
879 | } | |
912541b0 | 880 | return err; |
d46f37fd | 881 | } |
2d73813e | 882 | |
83cd6b75 | 883 | void udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask) |
2d73813e | 884 | { |
912541b0 | 885 | struct udev_list_entry *list_entry; |
912541b0 | 886 | |
912541b0 KS |
887 | udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) { |
888 | const char *cmd = udev_list_entry_get_name(list_entry); | |
83cd6b75 KS |
889 | enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry); |
890 | ||
891 | if (builtin_cmd < UDEV_BUILTIN_MAX) { | |
892 | char command[UTIL_PATH_SIZE]; | |
912541b0 | 893 | |
83cd6b75 KS |
894 | udev_event_apply_format(event, cmd, command, sizeof(command)); |
895 | udev_builtin_run(event->dev, builtin_cmd, command, false); | |
912541b0 KS |
896 | } else { |
897 | char program[UTIL_PATH_SIZE]; | |
898 | char **envp; | |
899 | ||
900 | if (event->exec_delay > 0) { | |
baa30fbc | 901 | log_debug("delay execution of '%s'\n", program); |
912541b0 KS |
902 | sleep(event->exec_delay); |
903 | } | |
904 | ||
905 | udev_event_apply_format(event, cmd, program, sizeof(program)); | |
906 | envp = udev_device_get_properties_envp(event->dev); | |
83cd6b75 | 907 | udev_event_spawn(event, program, envp, sigmask, NULL, 0); |
912541b0 KS |
908 | } |
909 | } | |
2d73813e | 910 | } |