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build-sys: bump systemd version to 'udev version 182'
[thirdparty/systemd.git] / src / udev / udev-event.c
CommitLineData
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		 39struct 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
KS		 53 dbg(event->udev, "allocated event %p\n", event);
54 return event;
aa8734ff
KS		 55}
56
57void udev_event_unref(struct udev_event *event)
58{
912541b0
KS		 59 if (event == NULL)
60 return;
61 udev_list_cleanup(&event->run_list);
62 free(event->program_result);
63 free(event->name);
64 dbg(event->udev, "free event %p\n", event);
65 free(event);
aa8734ff
KS		 66}
67
065db052 68size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
f1128767 69{
912541b0
KS		 70 struct udev_device *dev = event->dev;
71 enum subst_type {
72 SUBST_UNKNOWN,
73 SUBST_DEVNODE,
74 SUBST_ATTR,
75 SUBST_ENV,
76 SUBST_KERNEL,
77 SUBST_KERNEL_NUMBER,
78 SUBST_DRIVER,
79 SUBST_DEVPATH,
80 SUBST_ID,
81 SUBST_MAJOR,
82 SUBST_MINOR,
83 SUBST_RESULT,
84 SUBST_PARENT,
85 SUBST_NAME,
86 SUBST_LINKS,
87 SUBST_ROOT,
88 SUBST_SYS,
89 };
90 static const struct subst_map {
91 char *name;
92 char fmt;
93 enum subst_type type;
94 } map[] = {
95 { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
96 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
97 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
98 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
99 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
100 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
101 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
102 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
103 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
104 { .name = "id", .fmt = 'b', .type = SUBST_ID },
105 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
106 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
107 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
108 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
109 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
110 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
111 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
112 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
113 };
114 const char *from;
115 char *s;
116 size_t l;
117
118 from = src;
119 s = dest;
120 l = size;
121
122 for (;;) {
123 enum subst_type type = SUBST_UNKNOWN;
124 char attrbuf[UTIL_PATH_SIZE];
125 char *attr = NULL;
126
127 while (from[0] != '\0') {
128 if (from[0] == '$') {
129 /* substitute named variable */
130 unsigned int i;
131
132 if (from[1] == '$') {
133 from++;
134 goto copy;
135 }
136
137 for (i = 0; i < ARRAY_SIZE(map); i++) {
138 if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
139 type = map[i].type;
140 from += strlen(map[i].name)+1;
141 dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
142 goto subst;
143 }
144 }
145 } else if (from[0] == '%') {
146 /* substitute format char */
147 unsigned int i;
148
149 if (from[1] == '%') {
150 from++;
151 goto copy;
152 }
153
154 for (i = 0; i < ARRAY_SIZE(map); i++) {
155 if (from[1] == map[i].fmt) {
156 type = map[i].type;
157 from += 2;
158 dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
159 goto subst;
160 }
161 }
162 }
065db052 163copy:
912541b0
KS		 164 /* copy char */
165 if (l == 0)
166 goto out;
167 s[0] = from[0];
168 from++;
169 s++;
170 l--;
171 }
172
173 goto out;
065db052 174subst:
912541b0
KS		 175 /* extract possible $format{attr} */
176 if (from[0] == '{') {
177 unsigned int i;
178
179 from++;
180 for (i = 0; from[i] != '}'; i++) {
181 if (from[i] == '\0') {
182 err(event->udev, "missing closing brace for format '%s'\n", src);
183 goto out;
184 }
185 }
186 if (i >= sizeof(attrbuf))
187 goto out;
188 memcpy(attrbuf, from, i);
189 attrbuf[i] = '\0';
190 from += i+1;
191 attr = attrbuf;
192 } else {
193 attr = NULL;
194 }
195
196 switch (type) {
197 case SUBST_DEVPATH:
198 l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
199 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
200 break;
201 case SUBST_KERNEL:
202 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
203 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
204 break;
205 case SUBST_KERNEL_NUMBER:
206 if (udev_device_get_sysnum(dev) == NULL)
207 break;
208 l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
209 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
210 break;
211 case SUBST_ID:
212 if (event->dev_parent == NULL)
213 break;
214 l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
215 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
216 break;
217 case SUBST_DRIVER: {
218 const char *driver;
219
220 if (event->dev_parent == NULL)
221 break;
222
223 driver = udev_device_get_driver(event->dev_parent);
224 if (driver == NULL)
225 break;
226 l = util_strpcpy(&s, l, driver);
227 dbg(event->udev, "substitute driver '%s'\n", driver);
228 break;
229 }
230 case SUBST_MAJOR: {
231 char num[UTIL_PATH_SIZE];
232
233 sprintf(num, "%d", major(udev_device_get_devnum(dev)));
234 l = util_strpcpy(&s, l, num);
235 dbg(event->udev, "substitute major number '%s'\n", num);
236 break;
237 }
238 case SUBST_MINOR: {
239 char num[UTIL_PATH_SIZE];
240
241 sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
242 l = util_strpcpy(&s, l, num);
243 dbg(event->udev, "substitute minor number '%s'\n", num);
244 break;
245 }
246 case SUBST_RESULT: {
247 char *rest;
248 int i;
249
250 if (event->program_result == NULL)
251 break;
252 /* get part part of the result string */
253 i = 0;
254 if (attr != NULL)
255 i = strtoul(attr, &rest, 10);
256 if (i > 0) {
257 char result[UTIL_PATH_SIZE];
258 char tmp[UTIL_PATH_SIZE];
259 char *cpos;
260
261 dbg(event->udev, "request part #%d of result string\n", i);
262 util_strscpy(result, sizeof(result), event->program_result);
263 cpos = result;
264 while (--i) {
265 while (cpos[0] != '\0' && !isspace(cpos[0]))
266 cpos++;
267 while (isspace(cpos[0]))
268 cpos++;
269 }
270 if (i > 0) {
271 err(event->udev, "requested part of result string not found\n");
272 break;
273 }
274 util_strscpy(tmp, sizeof(tmp), cpos);
275 /* %{2+}c copies the whole string from the second part on */
276 if (rest[0] != '+') {
277 cpos = strchr(tmp, ' ');
278 if (cpos)
279 cpos[0] = '\0';
280 }
281 l = util_strpcpy(&s, l, tmp);
282 dbg(event->udev, "substitute part of result string '%s'\n", tmp);
283 } else {
284 l = util_strpcpy(&s, l, event->program_result);
285 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
286 }
287 break;
288 }
289 case SUBST_ATTR: {
290 const char *value = NULL;
291 char vbuf[UTIL_NAME_SIZE];
292 size_t len;
293 int count;
294
295 if (attr == NULL) {
296 err(event->udev, "missing file parameter for attr\n");
297 break;
298 }
299
300 /* try to read the value specified by "[dmi/id]product_name" */
301 if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
302 value = vbuf;
303
304 /* try to read the attribute the device */
305 if (value == NULL)
306 value = udev_device_get_sysattr_value(event->dev, attr);
307
308 /* try to read the attribute of the parent device, other matches have selected */
309 if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
310 value = udev_device_get_sysattr_value(event->dev_parent, attr);
311
312 if (value == NULL)
313 break;
314
315 /* strip trailing whitespace, and replace unwanted characters */
316 if (value != vbuf)
317 util_strscpy(vbuf, sizeof(vbuf), value);
318 len = strlen(vbuf);
319 while (len > 0 && isspace(vbuf[--len]))
320 vbuf[len] = '\0';
321 count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
322 if (count > 0)
323 info(event->udev, "%i character(s) replaced\n" , count);
324 l = util_strpcpy(&s, l, vbuf);
325 dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
326 break;
327 }
328 case SUBST_PARENT: {
329 struct udev_device *dev_parent;
330 const char *devnode;
331
332 dev_parent = udev_device_get_parent(event->dev);
333 if (dev_parent == NULL)
334 break;
335 devnode = udev_device_get_devnode(dev_parent);
336 if (devnode != NULL) {
337 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
338
339 l = util_strpcpy(&s, l, &devnode[devlen]);
340 dbg(event->udev, "found parent '%s', got node name '%s'\n",
341 udev_device_get_syspath(dev_parent), &devnode[devlen]);
342 }
343 break;
344 }
345 case SUBST_DEVNODE:
346 if (udev_device_get_devnode(dev) != NULL)
347 l = util_strpcpy(&s, l, udev_device_get_devnode(dev));
348 break;
b0a00806 349 case SUBST_NAME: {
912541b0
KS		 350 if (event->name != NULL) {
351 l = util_strpcpy(&s, l, event->name);
e605cf77
KS		 352 dbg(event->udev, "substitute custom node name '%s'\n", event->name);
353 } else if (udev_device_get_devnode(dev) != NULL) {
a7ef1181
KS		 354 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
355
b0a00806 356 l = util_strpcpy(&s, l, &udev_device_get_devnode(dev)[devlen]);
e605cf77
KS		 357 dbg(event->udev, "substitute node name'%s'\n", &udev_device_get_devnode(dev)[devlen]);
358 } else {
359 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
360 dbg(event->udev, "substitute device name'%s'\n", udev_device_get_sysname(dev));
912541b0
KS		 361 }
362 break;
b0a00806 363 }
912541b0
KS		 364 case SUBST_LINKS: {
365 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
366 struct udev_list_entry *list_entry;
367
368 list_entry = udev_device_get_devlinks_list_entry(dev);
369 if (list_entry == NULL)
370 break;
371 l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
372 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
373 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
374 break;
375 }
376 case SUBST_ROOT:
377 l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
378 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
379 break;
380 case SUBST_SYS:
381 l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
382 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
383 break;
384 case SUBST_ENV:
385 if (attr == NULL) {
386 dbg(event->udev, "missing attribute\n");
387 break;
388 } else {
389 const char *value;
390
391 value = udev_device_get_property_value(event->dev, attr);
392 if (value == NULL)
393 break;
394 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
395 l = util_strpcpy(&s, l, value);
396 break;
397 }
398 default:
399 err(event->udev, "unknown substitution type=%i\n", type);
400 break;
401 }
402 }
065db052
KS		 403
404out:
912541b0
KS		 405 s[0] = '\0';
406 dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
407 return l;
f1128767
KS		 408}
409
2181d30a 410static int spawn_exec(struct udev_event *event,
912541b0
KS		 411 const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
412 int fd_stdout, int fd_stderr)
2181d30a 413{
912541b0
KS		 414 struct udev *udev = event->udev;
415 int err;
416 int fd;
417
418 /* discard child output or connect to pipe */
419 fd = open("/dev/null", O_RDWR);
420 if (fd >= 0) {
421 dup2(fd, STDIN_FILENO);
422 if (fd_stdout < 0)
423 dup2(fd, STDOUT_FILENO);
424 if (fd_stderr < 0)
425 dup2(fd, STDERR_FILENO);
426 close(fd);
427 } else {
428 err(udev, "open /dev/null failed: %m\n");
429 }
430
431 /* connect pipes to std{out,err} */
432 if (fd_stdout >= 0) {
433 dup2(fd_stdout, STDOUT_FILENO);
434 close(fd_stdout);
435 }
436 if (fd_stderr >= 0) {
437 dup2(fd_stderr, STDERR_FILENO);
438 close(fd_stderr);
439 }
440
441 /* terminate child in case parent goes away */
442 prctl(PR_SET_PDEATHSIG, SIGTERM);
443
444 /* restore original udev sigmask before exec */
445 if (sigmask)
446 sigprocmask(SIG_SETMASK, sigmask, NULL);
447
448 execve(argv[0], argv, envp);
449
450 /* exec failed */
451 err = -errno;
452 err(udev, "failed to execute '%s' '%s': %m\n", argv[0], cmd);
453 return err;
2181d30a
KS		 454}
455
f18f225c 456static void spawn_read(struct udev_event *event,
912541b0
KS		 457 const char *cmd,
458 int fd_stdout, int fd_stderr,
459 char *result, size_t ressize)
2181d30a 460{
912541b0
KS		 461 struct udev *udev = event->udev;
462 size_t respos = 0;
463 int fd_ep = -1;
464 struct epoll_event ep_outpipe, ep_errpipe;
465
466 /* read from child if requested */
467 if (fd_stdout < 0 && fd_stderr < 0)
468 return;
469
470 fd_ep = epoll_create1(EPOLL_CLOEXEC);
471 if (fd_ep < 0) {
472 err(udev, "error creating epoll fd: %m\n");
473 goto out;
474 }
475
476 if (fd_stdout >= 0) {
477 memset(&ep_outpipe, 0, sizeof(struct epoll_event));
478 ep_outpipe.events = EPOLLIN;
479 ep_outpipe.data.ptr = &fd_stdout;
480 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
481 err(udev, "fail to add fd to epoll: %m\n");
482 goto out;
483 }
484 }
485
486 if (fd_stderr >= 0) {
487 memset(&ep_errpipe, 0, sizeof(struct epoll_event));
488 ep_errpipe.events = EPOLLIN;
489 ep_errpipe.data.ptr = &fd_stderr;
490 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
491 err(udev, "fail to add fd to epoll: %m\n");
492 goto out;
493 }
494 }
495
496 /* read child output */
497 while (fd_stdout >= 0 || fd_stderr >= 0) {
498 int timeout;
499 int fdcount;
500 struct epoll_event ev[4];
501 int i;
502
503 if (event->timeout_usec > 0) {
504 unsigned long long age_usec;
505
506 age_usec = now_usec() - event->birth_usec;
507 if (age_usec >= event->timeout_usec) {
508 err(udev, "timeout '%s'\n", cmd);
509 goto out;
510 }
511 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
512 } else {
513 timeout = -1;
514 }
515
516 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
517 if (fdcount < 0) {
518 if (errno == EINTR)
519 continue;
520 err(udev, "failed to poll: %m\n");
521 goto out;
522 }
523 if (fdcount == 0) {
524 err(udev, "timeout '%s'\n", cmd);
525 goto out;
526 }
527
528 for (i = 0; i < fdcount; i++) {
529 int *fd = (int *)ev[i].data.ptr;
530
531 if (ev[i].events & EPOLLIN) {
532 ssize_t count;
533 char buf[4096];
534
535 count = read(*fd, buf, sizeof(buf)-1);
536 if (count <= 0)
537 continue;
538 buf[count] = '\0';
539
540 /* store stdout result */
541 if (result != NULL && *fd == fd_stdout) {
542 if (respos + count < ressize) {
543 memcpy(&result[respos], buf, count);
544 respos += count;
545 } else {
546 err(udev, "'%s' ressize %zd too short\n", cmd, ressize);
547 }
548 }
549
550 /* log debug output only if we watch stderr */
551 if (fd_stderr >= 0) {
552 char *pos;
553 char *line;
554
555 pos = buf;
556 while ((line = strsep(&pos, "\n"))) {
557 if (pos != NULL || line[0] != '\0')
558 info(udev, "'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
559 }
560 }
561 } else if (ev[i].events & EPOLLHUP) {
562 if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
563 err(udev, "failed to remove fd from epoll: %m\n");
564 goto out;
565 }
566 *fd = -1;
567 }
568 }
569 }
570
571 /* return the child's stdout string */
572 if (result != NULL) {
573 result[respos] = '\0';
574 dbg(udev, "result='%s'\n", result);
575 }
2181d30a 576out:
912541b0
KS		 577 if (fd_ep >= 0)
578 close(fd_ep);
2181d30a
KS		 579}
580
581static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
582{
912541b0
KS		 583 struct udev *udev = event->udev;
584 struct pollfd pfd[1];
585 int err = 0;
586
587 pfd[0].events = POLLIN;
588 pfd[0].fd = event->fd_signal;
589
590 while (pid > 0) {
591 int timeout;
592 int fdcount;
593
594 if (event->timeout_usec > 0) {
595 unsigned long long age_usec;
596
597 age_usec = now_usec() - event->birth_usec;
598 if (age_usec >= event->timeout_usec)
599 timeout = 1000;
600 else
601 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
602 } else {
603 timeout = -1;
604 }
605
606 fdcount = poll(pfd, 1, timeout);
607 if (fdcount < 0) {
608 if (errno == EINTR)
609 continue;
610 err = -errno;
611 err(udev, "failed to poll: %m\n");
612 goto out;
613 }
614 if (fdcount == 0) {
615 err(udev, "timeout: killing '%s' [%u]\n", cmd, pid);
616 kill(pid, SIGKILL);
617 }
618
619 if (pfd[0].revents & POLLIN) {
620 struct signalfd_siginfo fdsi;
621 int status;
622 ssize_t size;
623
624 size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
625 if (size != sizeof(struct signalfd_siginfo))
626 continue;
627
628 switch (fdsi.ssi_signo) {
629 case SIGTERM:
630 event->sigterm = true;
631 break;
632 case SIGCHLD:
633 if (waitpid(pid, &status, WNOHANG) < 0)
634 break;
635 if (WIFEXITED(status)) {
636 info(udev, "'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
637 if (WEXITSTATUS(status) != 0)
638 err = -1;
639 } else if (WIFSIGNALED(status)) {
640 err(udev, "'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
641 err = -1;
642 } else if (WIFSTOPPED(status)) {
643 err(udev, "'%s' [%u] stopped\n", cmd, pid);
644 err = -1;
645 } else if (WIFCONTINUED(status)) {
646 err(udev, "'%s' [%u] continued\n", cmd, pid);
647 err = -1;
648 } else {
649 err(udev, "'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
650 err = -1;
651 }
652 pid = 0;
653 break;
654 }
655 }
656 }
2181d30a 657out:
912541b0 658 return err;
2181d30a
KS		 659}
660
e216e514
KS		 661int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[])
662{
912541b0
KS		 663 int i = 0;
664 char *pos;
665
666 if (strchr(cmd, ' ') == NULL) {
667 argv[i++] = cmd;
668 goto out;
669 }
670
671 pos = cmd;
672 while (pos != NULL && pos[0] != '\0') {
673 if (pos[0] == '\'') {
674 /* do not separate quotes */
675 pos++;
676 argv[i] = strsep(&pos, "\'");
677 if (pos != NULL)
678 while (pos[0] == ' ')
679 pos++;
680 } else {
681 argv[i] = strsep(&pos, " ");
682 if (pos != NULL)
683 while (pos[0] == ' ')
684 pos++;
685 }
686 dbg(udev, "argv[%i] '%s'\n", i, argv[i]);
687 i++;
688 }
e216e514 689out:
912541b0
KS		 690 argv[i] = NULL;
691 if (argc)
692 *argc = i;
693 return 0;
e216e514
KS		 694}
695
2181d30a 696int udev_event_spawn(struct udev_event *event,
912541b0
KS		 697 const char *cmd, char **envp, const sigset_t *sigmask,
698 char *result, size_t ressize)
2181d30a 699{
912541b0
KS		 700 struct udev *udev = event->udev;
701 int outpipe[2] = {-1, -1};
702 int errpipe[2] = {-1, -1};
703 pid_t pid;
704 char arg[UTIL_PATH_SIZE];
705 char *argv[128];
706 char program[UTIL_PATH_SIZE];
707 int err = 0;
708
709 util_strscpy(arg, sizeof(arg), cmd);
710 udev_build_argv(event->udev, arg, NULL, argv);
711
712 /* pipes from child to parent */
713 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
714 if (pipe2(outpipe, O_NONBLOCK) != 0) {
715 err = -errno;
716 err(udev, "pipe failed: %m\n");
717 goto out;
718 }
719 }
720 if (udev_get_log_priority(udev) >= LOG_INFO) {
721 if (pipe2(errpipe, O_NONBLOCK) != 0) {
722 err = -errno;
723 err(udev, "pipe failed: %m\n");
724 goto out;
725 }
726 }
727
728 /* allow programs in /usr/lib/udev/ to be called without the path */
729 if (argv[0][0] != '/') {
3e214785 730 util_strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
912541b0
KS		 731 argv[0] = program;
732 }
733
734 pid = fork();
735 switch(pid) {
736 case 0:
737 /* child closes parent's ends of pipes */
738 if (outpipe[READ_END] >= 0) {
739 close(outpipe[READ_END]);
740 outpipe[READ_END] = -1;
741 }
742 if (errpipe[READ_END] >= 0) {
743 close(errpipe[READ_END]);
744 errpipe[READ_END] = -1;
745 }
746
747 info(udev, "starting '%s'\n", cmd);
748
749 err = spawn_exec(event, cmd, argv, envp, sigmask,
750 outpipe[WRITE_END], errpipe[WRITE_END]);
751
752 _exit(2 );
753 case -1:
754 err(udev, "fork of '%s' failed: %m\n", cmd);
755 err = -1;
756 goto out;
757 default:
758 /* parent closed child's ends of pipes */
759 if (outpipe[WRITE_END] >= 0) {
760 close(outpipe[WRITE_END]);
761 outpipe[WRITE_END] = -1;
762 }
763 if (errpipe[WRITE_END] >= 0) {
764 close(errpipe[WRITE_END]);
765 errpipe[WRITE_END] = -1;
766 }
767
768 spawn_read(event, cmd,
769 outpipe[READ_END], errpipe[READ_END],
770 result, ressize);
771
772 err = spawn_wait(event, cmd, pid);
773 }
2181d30a
KS		 774
775out:
912541b0
KS		 776 if (outpipe[READ_END] >= 0)
777 close(outpipe[READ_END]);
778 if (outpipe[WRITE_END] >= 0)
779 close(outpipe[WRITE_END]);
780 if (errpipe[READ_END] >= 0)
781 close(errpipe[READ_END]);
782 if (errpipe[WRITE_END] >= 0)
783 close(errpipe[WRITE_END]);
784 return err;
2181d30a
KS		 785}
786
f1128767 787static void rename_netif_kernel_log(struct ifreq ifr)
d46f37fd 788{
912541b0
KS		 789 int klog;
790 FILE *f;
791
792 klog = open("/dev/kmsg", O_WRONLY);
793 if (klog < 0)
794 return;
795
796 f = fdopen(klog, "w");
797 if (f == NULL) {
798 close(klog);
799 return;
800 }
801
802 fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
803 getpid(), ifr.ifr_name, ifr.ifr_newname);
804 fclose(f);
d46f37fd
KS		 805}
806
aa8734ff 807static int rename_netif(struct udev_event *event)
d46f37fd 808{
912541b0
KS		 809 struct udev_device *dev = event->dev;
810 int sk;
811 struct ifreq ifr;
812 int loop;
813 int err;
814
815 info(event->udev, "changing net interface name from '%s' to '%s'\n",
816 udev_device_get_sysname(dev), event->name);
817
818 sk = socket(PF_INET, SOCK_DGRAM, 0);
819 if (sk < 0) {
820 err = -errno;
821 err(event->udev, "error opening socket: %m\n");
822 return err;
823 }
824
825 memset(&ifr, 0x00, sizeof(struct ifreq));
826 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
827 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
828 err = ioctl(sk, SIOCSIFNAME, &ifr);
829 if (err == 0) {
830 rename_netif_kernel_log(ifr);
831 goto out;
832 }
833
834 /* keep trying if the destination interface name already exists */
835 err = -errno;
836 if (err != -EEXIST)
837 goto out;
838
839 /* free our own name, another process may wait for us */
840 snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
841 err = ioctl(sk, SIOCSIFNAME, &ifr);
842 if (err < 0) {
843 err = -errno;
844 goto out;
845 }
846
847 /* log temporary name */
848 rename_netif_kernel_log(ifr);
849
850 /* wait a maximum of 90 seconds for our target to become available */
851 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
852 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
853 loop = 90 * 20;
854 while (loop--) {
855 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
856
857 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
858 event->name, (90 * 20) - loop);
859 nanosleep(&duration, NULL);
860
861 err = ioctl(sk, SIOCSIFNAME, &ifr);
862 if (err == 0) {
863 rename_netif_kernel_log(ifr);
864 break;
865 }
866 err = -errno;
867 if (err != -EEXIST)
868 break;
869 }
ce9a42be
KS		 870
871out:
912541b0
KS		 872 if (err < 0)
873 err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
874 close(sk);
875 return err;
d46f37fd
KS		 876}
877
2181d30a 878int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
d46f37fd 879{
912541b0
KS		 880 struct udev_device *dev = event->dev;
881 int err = 0;
882
883 if (udev_device_get_subsystem(dev) == NULL)
884 return -1;
885
886 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
887 udev_device_read_db(dev, NULL);
888 udev_device_delete_db(dev);
889 udev_device_tag_index(dev, NULL, false);
890
891 if (major(udev_device_get_devnum(dev)) != 0)
892 udev_watch_end(event->udev, dev);
893
894 udev_rules_apply_to_event(rules, event, sigmask);
895
896 if (major(udev_device_get_devnum(dev)) != 0)
e7f32890 897 udev_node_remove(dev);
912541b0
KS		 898 } else {
899 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
900 if (event->dev_db != NULL) {
901 udev_device_read_db(event->dev_db, NULL);
902 udev_device_set_info_loaded(event->dev_db);
903
904 /* disable watch during event processing */
905 if (major(udev_device_get_devnum(dev)) != 0)
906 udev_watch_end(event->udev, event->dev_db);
907 }
908
909 udev_rules_apply_to_event(rules, event, sigmask);
910
911 /* rename a new network interface, if needed */
912 if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
913 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
914 char syspath[UTIL_PATH_SIZE];
915 char *pos;
916
917 err = rename_netif(event);
918 if (err == 0) {
919 info(event->udev, "renamed netif to '%s'\n", event->name);
920
921 /* remember old name */
922 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
923
924 /* now change the devpath, because the kernel device name has changed */
925 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
926 pos = strrchr(syspath, '/');
927 if (pos != NULL) {
928 pos++;
929 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
930 udev_device_set_syspath(event->dev, syspath);
931 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
932 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
933 }
934 }
935 }
936
b0a00806 937 if (major(udev_device_get_devnum(dev)) > 0) {
912541b0
KS		 938 /* remove/update possible left-over symlinks from old database entry */
939 if (event->dev_db != NULL)
940 udev_node_update_old_links(dev, event->dev_db);
941
942 if (!event->mode_set) {
943 if (udev_device_get_devnode_mode(dev) > 0) {
944 /* kernel supplied value */
945 event->mode = udev_device_get_devnode_mode(dev);
946 } else if (event->gid > 0) {
947 /* default 0660 if a group is assigned */
948 event->mode = 0660;
949 } else {
950 /* default 0600 */
951 event->mode = 0600;
952 }
953 }
954
e7f32890 955 udev_node_add(dev, event->mode, event->uid, event->gid);
912541b0
KS		 956 }
957
958 /* preserve old, or get new initialization timestamp */
959 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
960 udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
961 else if (udev_device_get_usec_initialized(event->dev) == 0)
962 udev_device_set_usec_initialized(event->dev, now_usec());
963
964 /* (re)write database file */
965 udev_device_update_db(dev);
966 udev_device_tag_index(dev, event->dev_db, true);
967 udev_device_set_is_initialized(dev);
968
969 udev_device_unref(event->dev_db);
970 event->dev_db = NULL;
971 }
0ec5b5e1 972out:
912541b0 973 return err;
d46f37fd 974}
2d73813e 975
d412a685 976int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
2d73813e 977{
912541b0
KS		 978 struct udev_list_entry *list_entry;
979 int err = 0;
980
981 dbg(event->udev, "executing run list\n");
982 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
983 const char *cmd = udev_list_entry_get_name(list_entry);
984
985 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
986 struct udev_monitor *monitor;
987
988 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
989 if (monitor == NULL)
990 continue;
991 udev_monitor_send_device(monitor, NULL, event->dev);
992 udev_monitor_unref(monitor);
993 } else {
994 char program[UTIL_PATH_SIZE];
995 char **envp;
996
997 if (event->exec_delay > 0) {
998 info(event->udev, "delay execution of '%s'\n", program);
999 sleep(event->exec_delay);
1000 }
1001
1002 udev_event_apply_format(event, cmd, program, sizeof(program));
1003 envp = udev_device_get_properties_envp(event->dev);
1004 if (udev_event_spawn(event, program, envp, sigmask, NULL, 0) < 0) {
1005 if (udev_list_entry_get_num(list_entry))
1006 err = -1;
1007 }
1008 }
1009 }
1010 return err;
2d73813e 1011}
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