]>
Commit | Line | Data |
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d46f37fd | 1 | /* |
22582bb2 | 2 | * Copyright (C) 2003-2013 Kay Sievers <kay@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> | |
2181d30a KS |
28 | #include <sys/prctl.h> |
29 | #include <sys/poll.h> | |
30 | #include <sys/epoll.h> | |
31 | #include <sys/wait.h> | |
2181d30a | 32 | #include <sys/signalfd.h> |
d46f37fd KS |
33 | |
34 | #include "udev.h" | |
16d26d55 | 35 | #include "rtnl-util.h" |
d46f37fd | 36 | |
aa8734ff KS |
37 | struct udev_event *udev_event_new(struct udev_device *dev) |
38 | { | |
912541b0 KS |
39 | struct udev *udev = udev_device_get_udev(dev); |
40 | struct udev_event *event; | |
41 | ||
955d98c9 | 42 | event = new0(struct udev_event, 1); |
912541b0 KS |
43 | if (event == NULL) |
44 | return NULL; | |
45 | event->dev = dev; | |
46 | event->udev = udev; | |
47 | udev_list_init(udev, &event->run_list, false); | |
c26547d6 | 48 | udev_list_init(udev, &event->seclabel_list, false); |
912541b0 | 49 | event->fd_signal = -1; |
40fe8b11 | 50 | event->birth_usec = now(CLOCK_MONOTONIC); |
912541b0 | 51 | return event; |
aa8734ff KS |
52 | } |
53 | ||
54 | void udev_event_unref(struct udev_event *event) | |
55 | { | |
912541b0 KS |
56 | if (event == NULL) |
57 | return; | |
58 | udev_list_cleanup(&event->run_list); | |
c26547d6 | 59 | udev_list_cleanup(&event->seclabel_list); |
912541b0 KS |
60 | free(event->program_result); |
61 | free(event->name); | |
912541b0 | 62 | free(event); |
aa8734ff KS |
63 | } |
64 | ||
065db052 | 65 | size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) |
f1128767 | 66 | { |
912541b0 KS |
67 | struct udev_device *dev = event->dev; |
68 | enum subst_type { | |
69 | SUBST_UNKNOWN, | |
70 | SUBST_DEVNODE, | |
71 | SUBST_ATTR, | |
72 | SUBST_ENV, | |
73 | SUBST_KERNEL, | |
74 | SUBST_KERNEL_NUMBER, | |
75 | SUBST_DRIVER, | |
76 | SUBST_DEVPATH, | |
77 | SUBST_ID, | |
78 | SUBST_MAJOR, | |
79 | SUBST_MINOR, | |
80 | SUBST_RESULT, | |
81 | SUBST_PARENT, | |
82 | SUBST_NAME, | |
83 | SUBST_LINKS, | |
84 | SUBST_ROOT, | |
85 | SUBST_SYS, | |
86 | }; | |
87 | static const struct subst_map { | |
04a9d3a0 KS |
88 | const char *name; |
89 | const char fmt; | |
912541b0 KS |
90 | enum subst_type type; |
91 | } map[] = { | |
3fd0c4c6 KS |
92 | { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE }, |
93 | { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE }, | |
94 | { .name = "attr", .fmt = 's', .type = SUBST_ATTR }, | |
95 | { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR }, | |
96 | { .name = "env", .fmt = 'E', .type = SUBST_ENV }, | |
97 | { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL }, | |
98 | { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER }, | |
99 | { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER }, | |
100 | { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH }, | |
101 | { .name = "id", .fmt = 'b', .type = SUBST_ID }, | |
102 | { .name = "major", .fmt = 'M', .type = SUBST_MAJOR }, | |
103 | { .name = "minor", .fmt = 'm', .type = SUBST_MINOR }, | |
104 | { .name = "result", .fmt = 'c', .type = SUBST_RESULT }, | |
105 | { .name = "parent", .fmt = 'P', .type = SUBST_PARENT }, | |
106 | { .name = "name", .fmt = 'D', .type = SUBST_NAME }, | |
107 | { .name = "links", .fmt = 'L', .type = SUBST_LINKS }, | |
108 | { .name = "root", .fmt = 'r', .type = SUBST_ROOT }, | |
109 | { .name = "sys", .fmt = 'S', .type = SUBST_SYS }, | |
912541b0 KS |
110 | }; |
111 | const char *from; | |
112 | char *s; | |
113 | size_t l; | |
114 | ||
115 | from = src; | |
116 | s = dest; | |
117 | l = size; | |
118 | ||
119 | for (;;) { | |
120 | enum subst_type type = SUBST_UNKNOWN; | |
121 | char attrbuf[UTIL_PATH_SIZE]; | |
122 | char *attr = NULL; | |
123 | ||
124 | while (from[0] != '\0') { | |
125 | if (from[0] == '$') { | |
126 | /* substitute named variable */ | |
127 | unsigned int i; | |
128 | ||
129 | if (from[1] == '$') { | |
130 | from++; | |
131 | goto copy; | |
132 | } | |
133 | ||
8fef0ff2 | 134 | for (i = 0; i < ELEMENTSOF(map); i++) { |
33502ffe | 135 | if (startswith(&from[1], map[i].name)) { |
912541b0 KS |
136 | type = map[i].type; |
137 | from += strlen(map[i].name)+1; | |
912541b0 KS |
138 | goto subst; |
139 | } | |
140 | } | |
141 | } else if (from[0] == '%') { | |
142 | /* substitute format char */ | |
143 | unsigned int i; | |
144 | ||
145 | if (from[1] == '%') { | |
146 | from++; | |
147 | goto copy; | |
148 | } | |
149 | ||
8fef0ff2 | 150 | for (i = 0; i < ELEMENTSOF(map); i++) { |
912541b0 KS |
151 | if (from[1] == map[i].fmt) { |
152 | type = map[i].type; | |
153 | from += 2; | |
912541b0 KS |
154 | goto subst; |
155 | } | |
156 | } | |
157 | } | |
065db052 | 158 | copy: |
912541b0 KS |
159 | /* copy char */ |
160 | if (l == 0) | |
161 | goto out; | |
162 | s[0] = from[0]; | |
163 | from++; | |
164 | s++; | |
165 | l--; | |
166 | } | |
167 | ||
168 | goto out; | |
065db052 | 169 | subst: |
912541b0 KS |
170 | /* extract possible $format{attr} */ |
171 | if (from[0] == '{') { | |
172 | unsigned int i; | |
173 | ||
174 | from++; | |
175 | for (i = 0; from[i] != '}'; i++) { | |
176 | if (from[i] == '\0') { | |
9f6445e3 | 177 | log_error("missing closing brace for format '%s'", src); |
912541b0 KS |
178 | goto out; |
179 | } | |
180 | } | |
181 | if (i >= sizeof(attrbuf)) | |
182 | goto out; | |
183 | memcpy(attrbuf, from, i); | |
184 | attrbuf[i] = '\0'; | |
185 | from += i+1; | |
186 | attr = attrbuf; | |
187 | } else { | |
188 | attr = NULL; | |
189 | } | |
190 | ||
191 | switch (type) { | |
192 | case SUBST_DEVPATH: | |
d5a89d7d | 193 | l = strpcpy(&s, l, udev_device_get_devpath(dev)); |
912541b0 KS |
194 | break; |
195 | case SUBST_KERNEL: | |
d5a89d7d | 196 | l = strpcpy(&s, l, udev_device_get_sysname(dev)); |
912541b0 KS |
197 | break; |
198 | case SUBST_KERNEL_NUMBER: | |
199 | if (udev_device_get_sysnum(dev) == NULL) | |
200 | break; | |
d5a89d7d | 201 | l = strpcpy(&s, l, udev_device_get_sysnum(dev)); |
912541b0 KS |
202 | break; |
203 | case SUBST_ID: | |
204 | if (event->dev_parent == NULL) | |
205 | break; | |
d5a89d7d | 206 | l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent)); |
912541b0 KS |
207 | break; |
208 | case SUBST_DRIVER: { | |
209 | const char *driver; | |
210 | ||
211 | if (event->dev_parent == NULL) | |
212 | break; | |
213 | ||
214 | driver = udev_device_get_driver(event->dev_parent); | |
215 | if (driver == NULL) | |
216 | break; | |
d5a89d7d | 217 | l = strpcpy(&s, l, driver); |
912541b0 KS |
218 | break; |
219 | } | |
220 | case SUBST_MAJOR: { | |
221 | char num[UTIL_PATH_SIZE]; | |
222 | ||
223 | sprintf(num, "%d", major(udev_device_get_devnum(dev))); | |
d5a89d7d | 224 | l = strpcpy(&s, l, num); |
912541b0 KS |
225 | break; |
226 | } | |
227 | case SUBST_MINOR: { | |
228 | char num[UTIL_PATH_SIZE]; | |
229 | ||
230 | sprintf(num, "%d", minor(udev_device_get_devnum(dev))); | |
d5a89d7d | 231 | l = strpcpy(&s, l, num); |
912541b0 KS |
232 | break; |
233 | } | |
234 | case SUBST_RESULT: { | |
235 | char *rest; | |
236 | int i; | |
237 | ||
238 | if (event->program_result == NULL) | |
239 | break; | |
240 | /* get part part of the result string */ | |
241 | i = 0; | |
242 | if (attr != NULL) | |
243 | i = strtoul(attr, &rest, 10); | |
244 | if (i > 0) { | |
245 | char result[UTIL_PATH_SIZE]; | |
246 | char tmp[UTIL_PATH_SIZE]; | |
247 | char *cpos; | |
248 | ||
d5a89d7d | 249 | strscpy(result, sizeof(result), event->program_result); |
912541b0 KS |
250 | cpos = result; |
251 | while (--i) { | |
252 | while (cpos[0] != '\0' && !isspace(cpos[0])) | |
253 | cpos++; | |
254 | while (isspace(cpos[0])) | |
255 | cpos++; | |
66390abe LN |
256 | if (cpos[0] == '\0') |
257 | break; | |
912541b0 KS |
258 | } |
259 | if (i > 0) { | |
9f6445e3 | 260 | log_error("requested part of result string not found"); |
912541b0 KS |
261 | break; |
262 | } | |
d5a89d7d | 263 | strscpy(tmp, sizeof(tmp), cpos); |
912541b0 KS |
264 | /* %{2+}c copies the whole string from the second part on */ |
265 | if (rest[0] != '+') { | |
266 | cpos = strchr(tmp, ' '); | |
267 | if (cpos) | |
268 | cpos[0] = '\0'; | |
269 | } | |
d5a89d7d | 270 | l = strpcpy(&s, l, tmp); |
912541b0 | 271 | } else { |
d5a89d7d | 272 | l = strpcpy(&s, l, event->program_result); |
912541b0 KS |
273 | } |
274 | break; | |
275 | } | |
276 | case SUBST_ATTR: { | |
277 | const char *value = NULL; | |
278 | char vbuf[UTIL_NAME_SIZE]; | |
279 | size_t len; | |
280 | int count; | |
281 | ||
282 | if (attr == NULL) { | |
9f6445e3 | 283 | log_error("missing file parameter for attr"); |
912541b0 KS |
284 | break; |
285 | } | |
286 | ||
287 | /* try to read the value specified by "[dmi/id]product_name" */ | |
288 | if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0) | |
289 | value = vbuf; | |
290 | ||
291 | /* try to read the attribute the device */ | |
292 | if (value == NULL) | |
293 | value = udev_device_get_sysattr_value(event->dev, attr); | |
294 | ||
295 | /* try to read the attribute of the parent device, other matches have selected */ | |
296 | if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev) | |
297 | value = udev_device_get_sysattr_value(event->dev_parent, attr); | |
298 | ||
299 | if (value == NULL) | |
300 | break; | |
301 | ||
302 | /* strip trailing whitespace, and replace unwanted characters */ | |
303 | if (value != vbuf) | |
d5a89d7d | 304 | strscpy(vbuf, sizeof(vbuf), value); |
912541b0 KS |
305 | len = strlen(vbuf); |
306 | while (len > 0 && isspace(vbuf[--len])) | |
307 | vbuf[len] = '\0'; | |
308 | count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT); | |
309 | if (count > 0) | |
9f6445e3 | 310 | log_debug("%i character(s) replaced" , count); |
d5a89d7d | 311 | l = strpcpy(&s, l, vbuf); |
912541b0 KS |
312 | break; |
313 | } | |
314 | case SUBST_PARENT: { | |
315 | struct udev_device *dev_parent; | |
316 | const char *devnode; | |
317 | ||
318 | dev_parent = udev_device_get_parent(event->dev); | |
319 | if (dev_parent == NULL) | |
320 | break; | |
321 | devnode = udev_device_get_devnode(dev_parent); | |
6ada823a | 322 | if (devnode != NULL) |
d5a89d7d | 323 | l = strpcpy(&s, l, devnode + strlen("/dev/")); |
912541b0 KS |
324 | break; |
325 | } | |
326 | case SUBST_DEVNODE: | |
327 | if (udev_device_get_devnode(dev) != NULL) | |
d5a89d7d | 328 | l = strpcpy(&s, l, udev_device_get_devnode(dev)); |
912541b0 | 329 | break; |
6ada823a KS |
330 | case SUBST_NAME: |
331 | if (event->name != NULL) | |
d5a89d7d | 332 | l = strpcpy(&s, l, event->name); |
6ada823a | 333 | else if (udev_device_get_devnode(dev) != NULL) |
d5a89d7d | 334 | l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/")); |
6ada823a | 335 | else |
d5a89d7d | 336 | l = strpcpy(&s, l, udev_device_get_sysname(dev)); |
912541b0 KS |
337 | break; |
338 | case SUBST_LINKS: { | |
912541b0 KS |
339 | struct udev_list_entry *list_entry; |
340 | ||
341 | list_entry = udev_device_get_devlinks_list_entry(dev); | |
342 | if (list_entry == NULL) | |
343 | break; | |
d5a89d7d | 344 | l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/")); |
912541b0 | 345 | udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) |
d5a89d7d | 346 | l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL); |
912541b0 KS |
347 | break; |
348 | } | |
349 | case SUBST_ROOT: | |
d5a89d7d | 350 | l = strpcpy(&s, l, "/dev"); |
912541b0 KS |
351 | break; |
352 | case SUBST_SYS: | |
d5a89d7d | 353 | l = strpcpy(&s, l, "/sys"); |
912541b0 KS |
354 | break; |
355 | case SUBST_ENV: | |
356 | if (attr == NULL) { | |
912541b0 KS |
357 | break; |
358 | } else { | |
359 | const char *value; | |
360 | ||
361 | value = udev_device_get_property_value(event->dev, attr); | |
362 | if (value == NULL) | |
363 | break; | |
d5a89d7d | 364 | l = strpcpy(&s, l, value); |
912541b0 KS |
365 | break; |
366 | } | |
367 | default: | |
9f6445e3 | 368 | log_error("unknown substitution type=%i", type); |
912541b0 KS |
369 | break; |
370 | } | |
371 | } | |
065db052 KS |
372 | |
373 | out: | |
912541b0 | 374 | s[0] = '\0'; |
912541b0 | 375 | return l; |
f1128767 KS |
376 | } |
377 | ||
2181d30a | 378 | static int spawn_exec(struct udev_event *event, |
912541b0 KS |
379 | const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask, |
380 | int fd_stdout, int fd_stderr) | |
2181d30a | 381 | { |
912541b0 KS |
382 | int err; |
383 | int fd; | |
384 | ||
385 | /* discard child output or connect to pipe */ | |
386 | fd = open("/dev/null", O_RDWR); | |
387 | if (fd >= 0) { | |
388 | dup2(fd, STDIN_FILENO); | |
389 | if (fd_stdout < 0) | |
390 | dup2(fd, STDOUT_FILENO); | |
391 | if (fd_stderr < 0) | |
392 | dup2(fd, STDERR_FILENO); | |
393 | close(fd); | |
394 | } else { | |
9f6445e3 | 395 | log_error("open /dev/null failed: %m"); |
912541b0 KS |
396 | } |
397 | ||
398 | /* connect pipes to std{out,err} */ | |
399 | if (fd_stdout >= 0) { | |
400 | dup2(fd_stdout, STDOUT_FILENO); | |
401 | close(fd_stdout); | |
402 | } | |
403 | if (fd_stderr >= 0) { | |
404 | dup2(fd_stderr, STDERR_FILENO); | |
405 | close(fd_stderr); | |
406 | } | |
407 | ||
408 | /* terminate child in case parent goes away */ | |
409 | prctl(PR_SET_PDEATHSIG, SIGTERM); | |
410 | ||
411 | /* restore original udev sigmask before exec */ | |
412 | if (sigmask) | |
413 | sigprocmask(SIG_SETMASK, sigmask, NULL); | |
414 | ||
415 | execve(argv[0], argv, envp); | |
416 | ||
417 | /* exec failed */ | |
418 | err = -errno; | |
9f6445e3 | 419 | log_error("failed to execute '%s' '%s': %m", argv[0], cmd); |
912541b0 | 420 | return err; |
2181d30a KS |
421 | } |
422 | ||
f18f225c | 423 | static void spawn_read(struct udev_event *event, |
dd5eddd2 KS |
424 | usec_t timeout_usec, |
425 | const char *cmd, | |
426 | int fd_stdout, int fd_stderr, | |
427 | char *result, size_t ressize) | |
2181d30a | 428 | { |
912541b0 KS |
429 | size_t respos = 0; |
430 | int fd_ep = -1; | |
431 | struct epoll_event ep_outpipe, ep_errpipe; | |
432 | ||
433 | /* read from child if requested */ | |
434 | if (fd_stdout < 0 && fd_stderr < 0) | |
435 | return; | |
436 | ||
437 | fd_ep = epoll_create1(EPOLL_CLOEXEC); | |
438 | if (fd_ep < 0) { | |
9f6445e3 | 439 | log_error("error creating epoll fd: %m"); |
912541b0 KS |
440 | goto out; |
441 | } | |
442 | ||
443 | if (fd_stdout >= 0) { | |
29804cc1 | 444 | memzero(&ep_outpipe, sizeof(struct epoll_event)); |
912541b0 KS |
445 | ep_outpipe.events = EPOLLIN; |
446 | ep_outpipe.data.ptr = &fd_stdout; | |
447 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) { | |
9f6445e3 | 448 | log_error("fail to add fd to epoll: %m"); |
912541b0 KS |
449 | goto out; |
450 | } | |
451 | } | |
452 | ||
453 | if (fd_stderr >= 0) { | |
29804cc1 | 454 | memzero(&ep_errpipe, sizeof(struct epoll_event)); |
912541b0 KS |
455 | ep_errpipe.events = EPOLLIN; |
456 | ep_errpipe.data.ptr = &fd_stderr; | |
457 | if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) { | |
9f6445e3 | 458 | log_error("fail to add fd to epoll: %m"); |
912541b0 KS |
459 | goto out; |
460 | } | |
461 | } | |
462 | ||
463 | /* read child output */ | |
464 | while (fd_stdout >= 0 || fd_stderr >= 0) { | |
465 | int timeout; | |
466 | int fdcount; | |
467 | struct epoll_event ev[4]; | |
468 | int i; | |
469 | ||
dd5eddd2 | 470 | if (timeout_usec > 0) { |
40fe8b11 | 471 | usec_t age_usec; |
912541b0 | 472 | |
40fe8b11 | 473 | age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; |
dd5eddd2 | 474 | if (age_usec >= timeout_usec) { |
9f6445e3 | 475 | log_error("timeout '%s'", cmd); |
912541b0 KS |
476 | goto out; |
477 | } | |
dd5eddd2 | 478 | timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; |
912541b0 KS |
479 | } else { |
480 | timeout = -1; | |
481 | } | |
482 | ||
8fef0ff2 | 483 | fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout); |
912541b0 KS |
484 | if (fdcount < 0) { |
485 | if (errno == EINTR) | |
486 | continue; | |
9f6445e3 | 487 | log_error("failed to poll: %m"); |
912541b0 KS |
488 | goto out; |
489 | } | |
490 | if (fdcount == 0) { | |
9f6445e3 | 491 | log_error("timeout '%s'", cmd); |
912541b0 KS |
492 | goto out; |
493 | } | |
494 | ||
495 | for (i = 0; i < fdcount; i++) { | |
496 | int *fd = (int *)ev[i].data.ptr; | |
497 | ||
498 | if (ev[i].events & EPOLLIN) { | |
499 | ssize_t count; | |
500 | char buf[4096]; | |
501 | ||
502 | count = read(*fd, buf, sizeof(buf)-1); | |
503 | if (count <= 0) | |
504 | continue; | |
505 | buf[count] = '\0'; | |
506 | ||
507 | /* store stdout result */ | |
508 | if (result != NULL && *fd == fd_stdout) { | |
509 | if (respos + count < ressize) { | |
510 | memcpy(&result[respos], buf, count); | |
511 | respos += count; | |
512 | } else { | |
9f6445e3 | 513 | log_error("'%s' ressize %zd too short", cmd, ressize); |
912541b0 KS |
514 | } |
515 | } | |
516 | ||
517 | /* log debug output only if we watch stderr */ | |
518 | if (fd_stderr >= 0) { | |
519 | char *pos; | |
520 | char *line; | |
521 | ||
522 | pos = buf; | |
523 | while ((line = strsep(&pos, "\n"))) { | |
524 | if (pos != NULL || line[0] != '\0') | |
9f6445e3 | 525 | log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line); |
912541b0 KS |
526 | } |
527 | } | |
528 | } else if (ev[i].events & EPOLLHUP) { | |
529 | if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) { | |
9f6445e3 | 530 | log_error("failed to remove fd from epoll: %m"); |
912541b0 KS |
531 | goto out; |
532 | } | |
533 | *fd = -1; | |
534 | } | |
535 | } | |
536 | } | |
537 | ||
538 | /* return the child's stdout string */ | |
baa30fbc | 539 | if (result != NULL) |
912541b0 | 540 | result[respos] = '\0'; |
2181d30a | 541 | out: |
912541b0 KS |
542 | if (fd_ep >= 0) |
543 | close(fd_ep); | |
2181d30a KS |
544 | } |
545 | ||
dd5eddd2 KS |
546 | static int spawn_wait(struct udev_event *event, |
547 | usec_t timeout_usec, | |
548 | const char *cmd, pid_t pid) { | |
912541b0 KS |
549 | struct pollfd pfd[1]; |
550 | int err = 0; | |
551 | ||
552 | pfd[0].events = POLLIN; | |
553 | pfd[0].fd = event->fd_signal; | |
554 | ||
555 | while (pid > 0) { | |
556 | int timeout; | |
557 | int fdcount; | |
558 | ||
dd5eddd2 | 559 | if (timeout_usec > 0) { |
40fe8b11 | 560 | usec_t age_usec; |
912541b0 | 561 | |
40fe8b11 | 562 | age_usec = now(CLOCK_MONOTONIC) - event->birth_usec; |
dd5eddd2 | 563 | if (age_usec >= timeout_usec) |
912541b0 KS |
564 | timeout = 1000; |
565 | else | |
dd5eddd2 | 566 | timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC; |
912541b0 KS |
567 | } else { |
568 | timeout = -1; | |
569 | } | |
570 | ||
571 | fdcount = poll(pfd, 1, timeout); | |
572 | if (fdcount < 0) { | |
573 | if (errno == EINTR) | |
574 | continue; | |
575 | err = -errno; | |
9f6445e3 | 576 | log_error("failed to poll: %m"); |
912541b0 KS |
577 | goto out; |
578 | } | |
579 | if (fdcount == 0) { | |
9f6445e3 | 580 | log_error("timeout: killing '%s' [%u]", cmd, pid); |
912541b0 KS |
581 | kill(pid, SIGKILL); |
582 | } | |
583 | ||
584 | if (pfd[0].revents & POLLIN) { | |
585 | struct signalfd_siginfo fdsi; | |
586 | int status; | |
587 | ssize_t size; | |
588 | ||
589 | size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo)); | |
590 | if (size != sizeof(struct signalfd_siginfo)) | |
591 | continue; | |
592 | ||
593 | switch (fdsi.ssi_signo) { | |
594 | case SIGTERM: | |
595 | event->sigterm = true; | |
596 | break; | |
597 | case SIGCHLD: | |
598 | if (waitpid(pid, &status, WNOHANG) < 0) | |
599 | break; | |
600 | if (WIFEXITED(status)) { | |
9f6445e3 | 601 | log_debug("'%s' [%u] exit with return code %i", cmd, pid, WEXITSTATUS(status)); |
912541b0 KS |
602 | if (WEXITSTATUS(status) != 0) |
603 | err = -1; | |
604 | } else if (WIFSIGNALED(status)) { | |
9f6445e3 | 605 | log_error("'%s' [%u] terminated by signal %i (%s)", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status))); |
912541b0 KS |
606 | err = -1; |
607 | } else if (WIFSTOPPED(status)) { | |
9f6445e3 | 608 | log_error("'%s' [%u] stopped", cmd, pid); |
912541b0 KS |
609 | err = -1; |
610 | } else if (WIFCONTINUED(status)) { | |
9f6445e3 | 611 | log_error("'%s' [%u] continued", cmd, pid); |
912541b0 KS |
612 | err = -1; |
613 | } else { | |
9f6445e3 | 614 | log_error("'%s' [%u] exit with status 0x%04x", cmd, pid, status); |
912541b0 KS |
615 | err = -1; |
616 | } | |
617 | pid = 0; | |
618 | break; | |
619 | } | |
620 | } | |
621 | } | |
2181d30a | 622 | out: |
912541b0 | 623 | return err; |
2181d30a KS |
624 | } |
625 | ||
e216e514 KS |
626 | int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) |
627 | { | |
912541b0 KS |
628 | int i = 0; |
629 | char *pos; | |
630 | ||
631 | if (strchr(cmd, ' ') == NULL) { | |
632 | argv[i++] = cmd; | |
633 | goto out; | |
634 | } | |
635 | ||
636 | pos = cmd; | |
637 | while (pos != NULL && pos[0] != '\0') { | |
638 | if (pos[0] == '\'') { | |
639 | /* do not separate quotes */ | |
640 | pos++; | |
641 | argv[i] = strsep(&pos, "\'"); | |
642 | if (pos != NULL) | |
643 | while (pos[0] == ' ') | |
644 | pos++; | |
645 | } else { | |
646 | argv[i] = strsep(&pos, " "); | |
647 | if (pos != NULL) | |
648 | while (pos[0] == ' ') | |
649 | pos++; | |
650 | } | |
912541b0 KS |
651 | i++; |
652 | } | |
e216e514 | 653 | out: |
912541b0 KS |
654 | argv[i] = NULL; |
655 | if (argc) | |
656 | *argc = i; | |
657 | return 0; | |
e216e514 KS |
658 | } |
659 | ||
2181d30a | 660 | int udev_event_spawn(struct udev_event *event, |
dd5eddd2 | 661 | usec_t timeout_usec, |
912541b0 | 662 | const char *cmd, char **envp, const sigset_t *sigmask, |
dd5eddd2 | 663 | char *result, size_t ressize) { |
912541b0 KS |
664 | struct udev *udev = event->udev; |
665 | int outpipe[2] = {-1, -1}; | |
666 | int errpipe[2] = {-1, -1}; | |
667 | pid_t pid; | |
668 | char arg[UTIL_PATH_SIZE]; | |
669 | char *argv[128]; | |
670 | char program[UTIL_PATH_SIZE]; | |
671 | int err = 0; | |
672 | ||
d5a89d7d | 673 | strscpy(arg, sizeof(arg), cmd); |
912541b0 KS |
674 | udev_build_argv(event->udev, arg, NULL, argv); |
675 | ||
676 | /* pipes from child to parent */ | |
677 | if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) { | |
678 | if (pipe2(outpipe, O_NONBLOCK) != 0) { | |
679 | err = -errno; | |
9f6445e3 | 680 | log_error("pipe failed: %m"); |
912541b0 KS |
681 | goto out; |
682 | } | |
683 | } | |
684 | if (udev_get_log_priority(udev) >= LOG_INFO) { | |
685 | if (pipe2(errpipe, O_NONBLOCK) != 0) { | |
686 | err = -errno; | |
9f6445e3 | 687 | log_error("pipe failed: %m"); |
912541b0 KS |
688 | goto out; |
689 | } | |
690 | } | |
691 | ||
692 | /* allow programs in /usr/lib/udev/ to be called without the path */ | |
693 | if (argv[0][0] != '/') { | |
d5a89d7d | 694 | strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL); |
912541b0 KS |
695 | argv[0] = program; |
696 | } | |
697 | ||
698 | pid = fork(); | |
699 | switch(pid) { | |
700 | case 0: | |
701 | /* child closes parent's ends of pipes */ | |
702 | if (outpipe[READ_END] >= 0) { | |
703 | close(outpipe[READ_END]); | |
704 | outpipe[READ_END] = -1; | |
705 | } | |
706 | if (errpipe[READ_END] >= 0) { | |
707 | close(errpipe[READ_END]); | |
708 | errpipe[READ_END] = -1; | |
709 | } | |
710 | ||
9f6445e3 | 711 | log_debug("starting '%s'", cmd); |
912541b0 | 712 | |
b49d9b50 KS |
713 | spawn_exec(event, cmd, argv, envp, sigmask, |
714 | outpipe[WRITE_END], errpipe[WRITE_END]); | |
912541b0 KS |
715 | |
716 | _exit(2 ); | |
717 | case -1: | |
9f6445e3 | 718 | log_error("fork of '%s' failed: %m", cmd); |
912541b0 KS |
719 | err = -1; |
720 | goto out; | |
721 | default: | |
722 | /* parent closed child's ends of pipes */ | |
723 | if (outpipe[WRITE_END] >= 0) { | |
724 | close(outpipe[WRITE_END]); | |
725 | outpipe[WRITE_END] = -1; | |
726 | } | |
727 | if (errpipe[WRITE_END] >= 0) { | |
728 | close(errpipe[WRITE_END]); | |
729 | errpipe[WRITE_END] = -1; | |
730 | } | |
731 | ||
dd5eddd2 KS |
732 | spawn_read(event, |
733 | timeout_usec, | |
734 | cmd, | |
735 | outpipe[READ_END], errpipe[READ_END], | |
736 | result, ressize); | |
912541b0 | 737 | |
dd5eddd2 | 738 | err = spawn_wait(event, timeout_usec, cmd, pid); |
912541b0 | 739 | } |
2181d30a KS |
740 | |
741 | out: | |
912541b0 KS |
742 | if (outpipe[READ_END] >= 0) |
743 | close(outpipe[READ_END]); | |
744 | if (outpipe[WRITE_END] >= 0) | |
745 | close(outpipe[WRITE_END]); | |
746 | if (errpipe[READ_END] >= 0) | |
747 | close(errpipe[READ_END]); | |
748 | if (errpipe[WRITE_END] >= 0) | |
749 | close(errpipe[WRITE_END]); | |
750 | return err; | |
2181d30a KS |
751 | } |
752 | ||
aa8734ff | 753 | static int rename_netif(struct udev_event *event) |
d46f37fd | 754 | { |
912541b0 | 755 | struct udev_device *dev = event->dev; |
cf6a8911 | 756 | _cleanup_rtnl_unref_ sd_rtnl *rtnl = NULL; |
16d26d55 TG |
757 | char name[IFNAMSIZ]; |
758 | const char *oldname; | |
759 | int r; | |
760 | ||
761 | oldname = udev_device_get_sysname(dev); | |
912541b0 | 762 | |
9f6445e3 | 763 | log_debug("changing net interface name from '%s' to '%s'", |
16d26d55 | 764 | oldname, event->name); |
912541b0 | 765 | |
16d26d55 | 766 | strscpy(name, IFNAMSIZ, event->name); |
912541b0 | 767 | |
151b9b96 | 768 | r = sd_rtnl_open(&rtnl, 0); |
16d26d55 TG |
769 | if (r < 0) |
770 | return r; | |
771 | ||
3e137a1b | 772 | r = rtnl_set_link_name(rtnl, udev_device_get_ifindex(dev), name); |
16d26d55 TG |
773 | if (r < 0) |
774 | log_error("error changing net interface name %s to %s: %s", | |
775 | oldname, name, strerror(-r)); | |
776 | else | |
1514d708 | 777 | print_kmsg("renamed network interface %s to %s\n", oldname, name); |
16d26d55 TG |
778 | |
779 | return r; | |
d46f37fd KS |
780 | } |
781 | ||
dd5eddd2 KS |
782 | void udev_event_execute_rules(struct udev_event *event, |
783 | usec_t timeout_usec, | |
784 | struct udev_rules *rules, const sigset_t *sigmask) { | |
912541b0 | 785 | struct udev_device *dev = event->dev; |
912541b0 KS |
786 | |
787 | if (udev_device_get_subsystem(dev) == NULL) | |
1ea97217 | 788 | return; |
912541b0 | 789 | |
090be865 | 790 | if (streq(udev_device_get_action(dev), "remove")) { |
912541b0 KS |
791 | udev_device_read_db(dev, NULL); |
792 | udev_device_delete_db(dev); | |
793 | udev_device_tag_index(dev, NULL, false); | |
794 | ||
795 | if (major(udev_device_get_devnum(dev)) != 0) | |
796 | udev_watch_end(event->udev, dev); | |
797 | ||
dd5eddd2 | 798 | udev_rules_apply_to_event(rules, event, timeout_usec, sigmask); |
912541b0 KS |
799 | |
800 | if (major(udev_device_get_devnum(dev)) != 0) | |
e7f32890 | 801 | udev_node_remove(dev); |
912541b0 | 802 | } else { |
bf9d233f | 803 | event->dev_db = udev_device_new(event->udev); |
912541b0 | 804 | if (event->dev_db != NULL) { |
bf9d233f KS |
805 | udev_device_set_syspath(event->dev_db, udev_device_get_syspath(dev)); |
806 | udev_device_set_subsystem(event->dev_db, udev_device_get_subsystem(dev)); | |
912541b0 KS |
807 | udev_device_read_db(event->dev_db, NULL); |
808 | udev_device_set_info_loaded(event->dev_db); | |
809 | ||
810 | /* disable watch during event processing */ | |
811 | if (major(udev_device_get_devnum(dev)) != 0) | |
812 | udev_watch_end(event->udev, event->dev_db); | |
813 | } | |
814 | ||
dd5eddd2 | 815 | udev_rules_apply_to_event(rules, event, timeout_usec, sigmask); |
912541b0 KS |
816 | |
817 | /* rename a new network interface, if needed */ | |
090be865 TA |
818 | if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") && |
819 | event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) { | |
912541b0 KS |
820 | char syspath[UTIL_PATH_SIZE]; |
821 | char *pos; | |
1ea97217 | 822 | int r; |
912541b0 | 823 | |
1ea97217 KS |
824 | r = rename_netif(event); |
825 | if (r >= 0) { | |
9f6445e3 | 826 | log_debug("renamed netif to '%s'", event->name); |
912541b0 KS |
827 | |
828 | /* remember old name */ | |
829 | udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev)); | |
830 | ||
831 | /* now change the devpath, because the kernel device name has changed */ | |
d5a89d7d | 832 | strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev)); |
912541b0 KS |
833 | pos = strrchr(syspath, '/'); |
834 | if (pos != NULL) { | |
835 | pos++; | |
d5a89d7d | 836 | strscpy(pos, sizeof(syspath) - (pos - syspath), event->name); |
912541b0 KS |
837 | udev_device_set_syspath(event->dev, syspath); |
838 | udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev)); | |
9f6445e3 | 839 | log_debug("changed devpath to '%s'", udev_device_get_devpath(dev)); |
912541b0 KS |
840 | } |
841 | } | |
842 | } | |
843 | ||
b0a00806 | 844 | if (major(udev_device_get_devnum(dev)) > 0) { |
9a8ae49d KS |
845 | bool apply; |
846 | ||
912541b0 KS |
847 | /* remove/update possible left-over symlinks from old database entry */ |
848 | if (event->dev_db != NULL) | |
849 | udev_node_update_old_links(dev, event->dev_db); | |
850 | ||
1edefa4f KS |
851 | if (!event->owner_set) |
852 | event->uid = udev_device_get_devnode_uid(dev); | |
853 | ||
854 | if (!event->group_set) | |
855 | event->gid = udev_device_get_devnode_gid(dev); | |
856 | ||
912541b0 KS |
857 | if (!event->mode_set) { |
858 | if (udev_device_get_devnode_mode(dev) > 0) { | |
859 | /* kernel supplied value */ | |
860 | event->mode = udev_device_get_devnode_mode(dev); | |
861 | } else if (event->gid > 0) { | |
862 | /* default 0660 if a group is assigned */ | |
863 | event->mode = 0660; | |
864 | } else { | |
865 | /* default 0600 */ | |
866 | event->mode = 0600; | |
867 | } | |
868 | } | |
869 | ||
9a8ae49d | 870 | apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set; |
c26547d6 | 871 | udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list); |
912541b0 KS |
872 | } |
873 | ||
874 | /* preserve old, or get new initialization timestamp */ | |
875 | if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0) | |
876 | udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db)); | |
877 | else if (udev_device_get_usec_initialized(event->dev) == 0) | |
40fe8b11 | 878 | udev_device_set_usec_initialized(event->dev, now(CLOCK_MONOTONIC)); |
912541b0 KS |
879 | |
880 | /* (re)write database file */ | |
881 | udev_device_update_db(dev); | |
882 | udev_device_tag_index(dev, event->dev_db, true); | |
883 | udev_device_set_is_initialized(dev); | |
884 | ||
885 | udev_device_unref(event->dev_db); | |
886 | event->dev_db = NULL; | |
887 | } | |
d46f37fd | 888 | } |
2d73813e | 889 | |
dd5eddd2 | 890 | void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, const sigset_t *sigmask) { |
912541b0 | 891 | struct udev_list_entry *list_entry; |
912541b0 | 892 | |
912541b0 KS |
893 | udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) { |
894 | const char *cmd = udev_list_entry_get_name(list_entry); | |
83cd6b75 KS |
895 | enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry); |
896 | ||
897 | if (builtin_cmd < UDEV_BUILTIN_MAX) { | |
898 | char command[UTIL_PATH_SIZE]; | |
912541b0 | 899 | |
83cd6b75 KS |
900 | udev_event_apply_format(event, cmd, command, sizeof(command)); |
901 | udev_builtin_run(event->dev, builtin_cmd, command, false); | |
912541b0 KS |
902 | } else { |
903 | char program[UTIL_PATH_SIZE]; | |
904 | char **envp; | |
905 | ||
906 | if (event->exec_delay > 0) { | |
9f6445e3 | 907 | log_debug("delay execution of '%s'", program); |
912541b0 KS |
908 | sleep(event->exec_delay); |
909 | } | |
910 | ||
911 | udev_event_apply_format(event, cmd, program, sizeof(program)); | |
912 | envp = udev_device_get_properties_envp(event->dev); | |
dd5eddd2 | 913 | udev_event_spawn(event, timeout_usec, program, envp, sigmask, NULL, 0); |
912541b0 KS |
914 | } |
915 | } | |
2d73813e | 916 | } |