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fix some fallout from tab removal
[thirdparty/systemd.git] / src / 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;
349 case SUBST_NAME:
350 if (event->name != NULL) {
351 l = util_strpcpy(&s, l, event->name);
352 dbg(event->udev, "substitute name '%s'\n", event->name);
353 } else {
354 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
355 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
356 }
357 break;
358 case SUBST_LINKS: {
359 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
360 struct udev_list_entry *list_entry;
361
362 list_entry = udev_device_get_devlinks_list_entry(dev);
363 if (list_entry == NULL)
364 break;
365 l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
366 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
367 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
368 break;
369 }
370 case SUBST_ROOT:
371 l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
372 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
373 break;
374 case SUBST_SYS:
375 l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
376 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
377 break;
378 case SUBST_ENV:
379 if (attr == NULL) {
380 dbg(event->udev, "missing attribute\n");
381 break;
382 } else {
383 const char *value;
384
385 value = udev_device_get_property_value(event->dev, attr);
386 if (value == NULL)
387 break;
388 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
389 l = util_strpcpy(&s, l, value);
390 break;
391 }
392 default:
393 err(event->udev, "unknown substitution type=%i\n", type);
394 break;
395 }
396 }
065db052
KS		 397
398out:
912541b0
KS		 399 s[0] = '\0';
400 dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
401 return l;
f1128767
KS		 402}
403
2181d30a 404static int spawn_exec(struct udev_event *event,
912541b0
KS		 405 const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
406 int fd_stdout, int fd_stderr)
2181d30a 407{
912541b0
KS		 408 struct udev *udev = event->udev;
409 int err;
410 int fd;
411
412 /* discard child output or connect to pipe */
413 fd = open("/dev/null", O_RDWR);
414 if (fd >= 0) {
415 dup2(fd, STDIN_FILENO);
416 if (fd_stdout < 0)
417 dup2(fd, STDOUT_FILENO);
418 if (fd_stderr < 0)
419 dup2(fd, STDERR_FILENO);
420 close(fd);
421 } else {
422 err(udev, "open /dev/null failed: %m\n");
423 }
424
425 /* connect pipes to std{out,err} */
426 if (fd_stdout >= 0) {
427 dup2(fd_stdout, STDOUT_FILENO);
428 close(fd_stdout);
429 }
430 if (fd_stderr >= 0) {
431 dup2(fd_stderr, STDERR_FILENO);
432 close(fd_stderr);
433 }
434
435 /* terminate child in case parent goes away */
436 prctl(PR_SET_PDEATHSIG, SIGTERM);
437
438 /* restore original udev sigmask before exec */
439 if (sigmask)
440 sigprocmask(SIG_SETMASK, sigmask, NULL);
441
442 execve(argv[0], argv, envp);
443
444 /* exec failed */
445 err = -errno;
446 err(udev, "failed to execute '%s' '%s': %m\n", argv[0], cmd);
447 return err;
2181d30a
KS		 448}
449
f18f225c 450static void spawn_read(struct udev_event *event,
912541b0
KS		 451 const char *cmd,
452 int fd_stdout, int fd_stderr,
453 char *result, size_t ressize)
2181d30a 454{
912541b0
KS		 455 struct udev *udev = event->udev;
456 size_t respos = 0;
457 int fd_ep = -1;
458 struct epoll_event ep_outpipe, ep_errpipe;
459
460 /* read from child if requested */
461 if (fd_stdout < 0 && fd_stderr < 0)
462 return;
463
464 fd_ep = epoll_create1(EPOLL_CLOEXEC);
465 if (fd_ep < 0) {
466 err(udev, "error creating epoll fd: %m\n");
467 goto out;
468 }
469
470 if (fd_stdout >= 0) {
471 memset(&ep_outpipe, 0, sizeof(struct epoll_event));
472 ep_outpipe.events = EPOLLIN;
473 ep_outpipe.data.ptr = &fd_stdout;
474 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
475 err(udev, "fail to add fd to epoll: %m\n");
476 goto out;
477 }
478 }
479
480 if (fd_stderr >= 0) {
481 memset(&ep_errpipe, 0, sizeof(struct epoll_event));
482 ep_errpipe.events = EPOLLIN;
483 ep_errpipe.data.ptr = &fd_stderr;
484 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
485 err(udev, "fail to add fd to epoll: %m\n");
486 goto out;
487 }
488 }
489
490 /* read child output */
491 while (fd_stdout >= 0 || fd_stderr >= 0) {
492 int timeout;
493 int fdcount;
494 struct epoll_event ev[4];
495 int i;
496
497 if (event->timeout_usec > 0) {
498 unsigned long long age_usec;
499
500 age_usec = now_usec() - event->birth_usec;
501 if (age_usec >= event->timeout_usec) {
502 err(udev, "timeout '%s'\n", cmd);
503 goto out;
504 }
505 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
506 } else {
507 timeout = -1;
508 }
509
510 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
511 if (fdcount < 0) {
512 if (errno == EINTR)
513 continue;
514 err(udev, "failed to poll: %m\n");
515 goto out;
516 }
517 if (fdcount == 0) {
518 err(udev, "timeout '%s'\n", cmd);
519 goto out;
520 }
521
522 for (i = 0; i < fdcount; i++) {
523 int *fd = (int *)ev[i].data.ptr;
524
525 if (ev[i].events & EPOLLIN) {
526 ssize_t count;
527 char buf[4096];
528
529 count = read(*fd, buf, sizeof(buf)-1);
530 if (count <= 0)
531 continue;
532 buf[count] = '\0';
533
534 /* store stdout result */
535 if (result != NULL && *fd == fd_stdout) {
536 if (respos + count < ressize) {
537 memcpy(&result[respos], buf, count);
538 respos += count;
539 } else {
540 err(udev, "'%s' ressize %zd too short\n", cmd, ressize);
541 }
542 }
543
544 /* log debug output only if we watch stderr */
545 if (fd_stderr >= 0) {
546 char *pos;
547 char *line;
548
549 pos = buf;
550 while ((line = strsep(&pos, "\n"))) {
551 if (pos != NULL || line[0] != '\0')
552 info(udev, "'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
553 }
554 }
555 } else if (ev[i].events & EPOLLHUP) {
556 if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
557 err(udev, "failed to remove fd from epoll: %m\n");
558 goto out;
559 }
560 *fd = -1;
561 }
562 }
563 }
564
565 /* return the child's stdout string */
566 if (result != NULL) {
567 result[respos] = '\0';
568 dbg(udev, "result='%s'\n", result);
569 }
2181d30a 570out:
912541b0
KS		 571 if (fd_ep >= 0)
572 close(fd_ep);
2181d30a
KS		 573}
574
575static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
576{
912541b0
KS		 577 struct udev *udev = event->udev;
578 struct pollfd pfd[1];
579 int err = 0;
580
581 pfd[0].events = POLLIN;
582 pfd[0].fd = event->fd_signal;
583
584 while (pid > 0) {
585 int timeout;
586 int fdcount;
587
588 if (event->timeout_usec > 0) {
589 unsigned long long age_usec;
590
591 age_usec = now_usec() - event->birth_usec;
592 if (age_usec >= event->timeout_usec)
593 timeout = 1000;
594 else
595 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
596 } else {
597 timeout = -1;
598 }
599
600 fdcount = poll(pfd, 1, timeout);
601 if (fdcount < 0) {
602 if (errno == EINTR)
603 continue;
604 err = -errno;
605 err(udev, "failed to poll: %m\n");
606 goto out;
607 }
608 if (fdcount == 0) {
609 err(udev, "timeout: killing '%s' [%u]\n", cmd, pid);
610 kill(pid, SIGKILL);
611 }
612
613 if (pfd[0].revents & POLLIN) {
614 struct signalfd_siginfo fdsi;
615 int status;
616 ssize_t size;
617
618 size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
619 if (size != sizeof(struct signalfd_siginfo))
620 continue;
621
622 switch (fdsi.ssi_signo) {
623 case SIGTERM:
624 event->sigterm = true;
625 break;
626 case SIGCHLD:
627 if (waitpid(pid, &status, WNOHANG) < 0)
628 break;
629 if (WIFEXITED(status)) {
630 info(udev, "'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
631 if (WEXITSTATUS(status) != 0)
632 err = -1;
633 } else if (WIFSIGNALED(status)) {
634 err(udev, "'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
635 err = -1;
636 } else if (WIFSTOPPED(status)) {
637 err(udev, "'%s' [%u] stopped\n", cmd, pid);
638 err = -1;
639 } else if (WIFCONTINUED(status)) {
640 err(udev, "'%s' [%u] continued\n", cmd, pid);
641 err = -1;
642 } else {
643 err(udev, "'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
644 err = -1;
645 }
646 pid = 0;
647 break;
648 }
649 }
650 }
2181d30a 651out:
912541b0 652 return err;
2181d30a
KS		 653}
654
e216e514
KS		 655int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[])
656{
912541b0
KS		 657 int i = 0;
658 char *pos;
659
660 if (strchr(cmd, ' ') == NULL) {
661 argv[i++] = cmd;
662 goto out;
663 }
664
665 pos = cmd;
666 while (pos != NULL && pos[0] != '\0') {
667 if (pos[0] == '\'') {
668 /* do not separate quotes */
669 pos++;
670 argv[i] = strsep(&pos, "\'");
671 if (pos != NULL)
672 while (pos[0] == ' ')
673 pos++;
674 } else {
675 argv[i] = strsep(&pos, " ");
676 if (pos != NULL)
677 while (pos[0] == ' ')
678 pos++;
679 }
680 dbg(udev, "argv[%i] '%s'\n", i, argv[i]);
681 i++;
682 }
e216e514 683out:
912541b0
KS		 684 argv[i] = NULL;
685 if (argc)
686 *argc = i;
687 return 0;
e216e514
KS		 688}
689
2181d30a 690int udev_event_spawn(struct udev_event *event,
912541b0
KS		 691 const char *cmd, char **envp, const sigset_t *sigmask,
692 char *result, size_t ressize)
2181d30a 693{
912541b0
KS		 694 struct udev *udev = event->udev;
695 int outpipe[2] = {-1, -1};
696 int errpipe[2] = {-1, -1};
697 pid_t pid;
698 char arg[UTIL_PATH_SIZE];
699 char *argv[128];
700 char program[UTIL_PATH_SIZE];
701 int err = 0;
702
703 util_strscpy(arg, sizeof(arg), cmd);
704 udev_build_argv(event->udev, arg, NULL, argv);
705
706 /* pipes from child to parent */
707 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
708 if (pipe2(outpipe, O_NONBLOCK) != 0) {
709 err = -errno;
710 err(udev, "pipe failed: %m\n");
711 goto out;
712 }
713 }
714 if (udev_get_log_priority(udev) >= LOG_INFO) {
715 if (pipe2(errpipe, O_NONBLOCK) != 0) {
716 err = -errno;
717 err(udev, "pipe failed: %m\n");
718 goto out;
719 }
720 }
721
722 /* allow programs in /usr/lib/udev/ to be called without the path */
723 if (argv[0][0] != '/') {
724 util_strscpyl(program, sizeof(program), PKGLIBEXECDIR "/", argv[0], NULL);
725 argv[0] = program;
726 }
727
728 pid = fork();
729 switch(pid) {
730 case 0:
731 /* child closes parent's ends of pipes */
732 if (outpipe[READ_END] >= 0) {
733 close(outpipe[READ_END]);
734 outpipe[READ_END] = -1;
735 }
736 if (errpipe[READ_END] >= 0) {
737 close(errpipe[READ_END]);
738 errpipe[READ_END] = -1;
739 }
740
741 info(udev, "starting '%s'\n", cmd);
742
743 err = spawn_exec(event, cmd, argv, envp, sigmask,
744 outpipe[WRITE_END], errpipe[WRITE_END]);
745
746 _exit(2 );
747 case -1:
748 err(udev, "fork of '%s' failed: %m\n", cmd);
749 err = -1;
750 goto out;
751 default:
752 /* parent closed child's ends of pipes */
753 if (outpipe[WRITE_END] >= 0) {
754 close(outpipe[WRITE_END]);
755 outpipe[WRITE_END] = -1;
756 }
757 if (errpipe[WRITE_END] >= 0) {
758 close(errpipe[WRITE_END]);
759 errpipe[WRITE_END] = -1;
760 }
761
762 spawn_read(event, cmd,
763 outpipe[READ_END], errpipe[READ_END],
764 result, ressize);
765
766 err = spawn_wait(event, cmd, pid);
767 }
2181d30a
KS		 768
769out:
912541b0
KS		 770 if (outpipe[READ_END] >= 0)
771 close(outpipe[READ_END]);
772 if (outpipe[WRITE_END] >= 0)
773 close(outpipe[WRITE_END]);
774 if (errpipe[READ_END] >= 0)
775 close(errpipe[READ_END]);
776 if (errpipe[WRITE_END] >= 0)
777 close(errpipe[WRITE_END]);
778 return err;
2181d30a
KS		 779}
780
f1128767 781static void rename_netif_kernel_log(struct ifreq ifr)
d46f37fd 782{
912541b0
KS		 783 int klog;
784 FILE *f;
785
786 klog = open("/dev/kmsg", O_WRONLY);
787 if (klog < 0)
788 return;
789
790 f = fdopen(klog, "w");
791 if (f == NULL) {
792 close(klog);
793 return;
794 }
795
796 fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
797 getpid(), ifr.ifr_name, ifr.ifr_newname);
798 fclose(f);
d46f37fd
KS		 799}
800
aa8734ff 801static int rename_netif(struct udev_event *event)
d46f37fd 802{
912541b0
KS		 803 struct udev_device *dev = event->dev;
804 int sk;
805 struct ifreq ifr;
806 int loop;
807 int err;
808
809 info(event->udev, "changing net interface name from '%s' to '%s'\n",
810 udev_device_get_sysname(dev), event->name);
811
812 sk = socket(PF_INET, SOCK_DGRAM, 0);
813 if (sk < 0) {
814 err = -errno;
815 err(event->udev, "error opening socket: %m\n");
816 return err;
817 }
818
819 memset(&ifr, 0x00, sizeof(struct ifreq));
820 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
821 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
822 err = ioctl(sk, SIOCSIFNAME, &ifr);
823 if (err == 0) {
824 rename_netif_kernel_log(ifr);
825 goto out;
826 }
827
828 /* keep trying if the destination interface name already exists */
829 err = -errno;
830 if (err != -EEXIST)
831 goto out;
832
833 /* free our own name, another process may wait for us */
834 snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
835 err = ioctl(sk, SIOCSIFNAME, &ifr);
836 if (err < 0) {
837 err = -errno;
838 goto out;
839 }
840
841 /* log temporary name */
842 rename_netif_kernel_log(ifr);
843
844 /* wait a maximum of 90 seconds for our target to become available */
845 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
846 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
847 loop = 90 * 20;
848 while (loop--) {
849 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
850
851 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
852 event->name, (90 * 20) - loop);
853 nanosleep(&duration, NULL);
854
855 err = ioctl(sk, SIOCSIFNAME, &ifr);
856 if (err == 0) {
857 rename_netif_kernel_log(ifr);
858 break;
859 }
860 err = -errno;
861 if (err != -EEXIST)
862 break;
863 }
ce9a42be
KS		 864
865out:
912541b0
KS		 866 if (err < 0)
867 err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
868 close(sk);
869 return err;
d46f37fd
KS		 870}
871
2181d30a 872int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
d46f37fd 873{
912541b0
KS		 874 struct udev_device *dev = event->dev;
875 int err = 0;
876
877 if (udev_device_get_subsystem(dev) == NULL)
878 return -1;
879
880 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
881 udev_device_read_db(dev, NULL);
882 udev_device_delete_db(dev);
883 udev_device_tag_index(dev, NULL, false);
884
885 if (major(udev_device_get_devnum(dev)) != 0)
886 udev_watch_end(event->udev, dev);
887
888 udev_rules_apply_to_event(rules, event, sigmask);
889
890 if (major(udev_device_get_devnum(dev)) != 0)
891 err = udev_node_remove(dev);
892 } else {
893 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
894 if (event->dev_db != NULL) {
895 udev_device_read_db(event->dev_db, NULL);
896 udev_device_set_info_loaded(event->dev_db);
897
898 /* disable watch during event processing */
899 if (major(udev_device_get_devnum(dev)) != 0)
900 udev_watch_end(event->udev, event->dev_db);
901 }
902
903 udev_rules_apply_to_event(rules, event, sigmask);
904
905 /* rename a new network interface, if needed */
906 if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
907 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
908 char syspath[UTIL_PATH_SIZE];
909 char *pos;
910
911 err = rename_netif(event);
912 if (err == 0) {
913 info(event->udev, "renamed netif to '%s'\n", event->name);
914
915 /* remember old name */
916 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
917
918 /* now change the devpath, because the kernel device name has changed */
919 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
920 pos = strrchr(syspath, '/');
921 if (pos != NULL) {
922 pos++;
923 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
924 udev_device_set_syspath(event->dev, syspath);
925 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
926 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
927 }
928 }
929 }
930
931 if (major(udev_device_get_devnum(dev)) != 0) {
932 /* remove/update possible left-over symlinks from old database entry */
933 if (event->dev_db != NULL)
934 udev_node_update_old_links(dev, event->dev_db);
935
936 if (!event->mode_set) {
937 if (udev_device_get_devnode_mode(dev) > 0) {
938 /* kernel supplied value */
939 event->mode = udev_device_get_devnode_mode(dev);
940 } else if (event->gid > 0) {
941 /* default 0660 if a group is assigned */
942 event->mode = 0660;
943 } else {
944 /* default 0600 */
945 event->mode = 0600;
946 }
947 }
948
949 err = udev_node_add(dev, event->mode, event->uid, event->gid);
950 }
951
952 /* preserve old, or get new initialization timestamp */
953 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
954 udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
955 else if (udev_device_get_usec_initialized(event->dev) == 0)
956 udev_device_set_usec_initialized(event->dev, now_usec());
957
958 /* (re)write database file */
959 udev_device_update_db(dev);
960 udev_device_tag_index(dev, event->dev_db, true);
961 udev_device_set_is_initialized(dev);
962
963 udev_device_unref(event->dev_db);
964 event->dev_db = NULL;
965 }
0ec5b5e1 966out:
912541b0 967 return err;
d46f37fd 968}
2d73813e 969
d412a685 970int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
2d73813e 971{
912541b0
KS		 972 struct udev_list_entry *list_entry;
973 int err = 0;
974
975 dbg(event->udev, "executing run list\n");
976 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
977 const char *cmd = udev_list_entry_get_name(list_entry);
978
979 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
980 struct udev_monitor *monitor;
981
982 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
983 if (monitor == NULL)
984 continue;
985 udev_monitor_send_device(monitor, NULL, event->dev);
986 udev_monitor_unref(monitor);
987 } else {
988 char program[UTIL_PATH_SIZE];
989 char **envp;
990
991 if (event->exec_delay > 0) {
992 info(event->udev, "delay execution of '%s'\n", program);
993 sleep(event->exec_delay);
994 }
995
996 udev_event_apply_format(event, cmd, program, sizeof(program));
997 envp = udev_device_get_properties_envp(event->dev);
998 if (udev_event_spawn(event, program, envp, sigmask, NULL, 0) < 0) {
999 if (udev_list_entry_get_num(list_entry))
1000 err = -1;
1001 }
1002 }
1003 }
1004 return err;
2d73813e 1005}
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