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udev: keymap: remove rootprefix mangling from script
[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 53 return event;
aa8734ff
KS		 54}
55
56void 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 66size_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 {
89 char *name;
90 char fmt;
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
135 for (i = 0; i < ARRAY_SIZE(map); i++) {
136 if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
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
151 for (i = 0; i < ARRAY_SIZE(map); i++) {
152 if (from[1] == map[i].fmt) {
153 type = map[i].type;
154 from += 2;
912541b0
KS		 155 goto subst;
156 }
157 }
158 }
065db052 159copy:
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 170subst:
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);
321 if (devnode != NULL) {
322 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
323
324 l = util_strpcpy(&s, l, &devnode[devlen]);
912541b0
KS		 325 }
326 break;
327 }
328 case SUBST_DEVNODE:
329 if (udev_device_get_devnode(dev) != NULL)
330 l = util_strpcpy(&s, l, udev_device_get_devnode(dev));
331 break;
b0a00806 332 case SUBST_NAME: {
912541b0
KS		 333 if (event->name != NULL) {
334 l = util_strpcpy(&s, l, event->name);
e605cf77 335 } else if (udev_device_get_devnode(dev) != NULL) {
a7ef1181
KS		 336 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
337
b0a00806 338 l = util_strpcpy(&s, l, &udev_device_get_devnode(dev)[devlen]);
e605cf77
KS		 339 } else {
340 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
912541b0
KS		 341 }
342 break;
b0a00806 343 }
912541b0
KS		 344 case SUBST_LINKS: {
345 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
346 struct udev_list_entry *list_entry;
347
348 list_entry = udev_device_get_devlinks_list_entry(dev);
349 if (list_entry == NULL)
350 break;
351 l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
352 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
353 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
354 break;
355 }
356 case SUBST_ROOT:
357 l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
912541b0
KS		 358 break;
359 case SUBST_SYS:
360 l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
912541b0
KS		 361 break;
362 case SUBST_ENV:
363 if (attr == NULL) {
912541b0
KS		 364 break;
365 } else {
366 const char *value;
367
368 value = udev_device_get_property_value(event->dev, attr);
369 if (value == NULL)
370 break;
912541b0
KS		 371 l = util_strpcpy(&s, l, value);
372 break;
373 }
374 default:
baa30fbc 375 log_error("unknown substitution type=%i\n", type);
912541b0
KS		 376 break;
377 }
378 }
065db052
KS		 379
380out:
912541b0 381 s[0] = '\0';
912541b0 382 return l;
f1128767
KS		 383}
384
2181d30a 385static int spawn_exec(struct udev_event *event,
912541b0
KS		 386 const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
387 int fd_stdout, int fd_stderr)
2181d30a 388{
912541b0
KS		 389 struct udev *udev = event->udev;
390 int err;
391 int fd;
392
393 /* discard child output or connect to pipe */
394 fd = open("/dev/null", O_RDWR);
395 if (fd >= 0) {
396 dup2(fd, STDIN_FILENO);
397 if (fd_stdout < 0)
398 dup2(fd, STDOUT_FILENO);
399 if (fd_stderr < 0)
400 dup2(fd, STDERR_FILENO);
401 close(fd);
402 } else {
baa30fbc 403 log_error("open /dev/null failed: %m\n");
912541b0
KS		 404 }
405
406 /* connect pipes to std{out,err} */
407 if (fd_stdout >= 0) {
408 dup2(fd_stdout, STDOUT_FILENO);
409 close(fd_stdout);
410 }
411 if (fd_stderr >= 0) {
412 dup2(fd_stderr, STDERR_FILENO);
413 close(fd_stderr);
414 }
415
416 /* terminate child in case parent goes away */
417 prctl(PR_SET_PDEATHSIG, SIGTERM);
418
419 /* restore original udev sigmask before exec */
420 if (sigmask)
421 sigprocmask(SIG_SETMASK, sigmask, NULL);
422
423 execve(argv[0], argv, envp);
424
425 /* exec failed */
426 err = -errno;
baa30fbc 427 log_error("failed to execute '%s' '%s': %m\n", argv[0], cmd);
912541b0 428 return err;
2181d30a
KS		 429}
430
f18f225c 431static void spawn_read(struct udev_event *event,
912541b0
KS		 432 const char *cmd,
433 int fd_stdout, int fd_stderr,
434 char *result, size_t ressize)
2181d30a 435{
912541b0
KS		 436 struct udev *udev = event->udev;
437 size_t respos = 0;
438 int fd_ep = -1;
439 struct epoll_event ep_outpipe, ep_errpipe;
440
441 /* read from child if requested */
442 if (fd_stdout < 0 && fd_stderr < 0)
443 return;
444
445 fd_ep = epoll_create1(EPOLL_CLOEXEC);
446 if (fd_ep < 0) {
baa30fbc 447 log_error("error creating epoll fd: %m\n");
912541b0
KS		 448 goto out;
449 }
450
451 if (fd_stdout >= 0) {
452 memset(&ep_outpipe, 0, sizeof(struct epoll_event));
453 ep_outpipe.events = EPOLLIN;
454 ep_outpipe.data.ptr = &fd_stdout;
455 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
baa30fbc 456 log_error("fail to add fd to epoll: %m\n");
912541b0
KS		 457 goto out;
458 }
459 }
460
461 if (fd_stderr >= 0) {
462 memset(&ep_errpipe, 0, sizeof(struct epoll_event));
463 ep_errpipe.events = EPOLLIN;
464 ep_errpipe.data.ptr = &fd_stderr;
465 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
baa30fbc 466 log_error("fail to add fd to epoll: %m\n");
912541b0
KS		 467 goto out;
468 }
469 }
470
471 /* read child output */
472 while (fd_stdout >= 0 || fd_stderr >= 0) {
473 int timeout;
474 int fdcount;
475 struct epoll_event ev[4];
476 int i;
477
478 if (event->timeout_usec > 0) {
479 unsigned long long age_usec;
480
481 age_usec = now_usec() - event->birth_usec;
482 if (age_usec >= event->timeout_usec) {
baa30fbc 483 log_error("timeout '%s'\n", cmd);
912541b0
KS		 484 goto out;
485 }
486 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
487 } else {
488 timeout = -1;
489 }
490
491 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
492 if (fdcount < 0) {
493 if (errno == EINTR)
494 continue;
baa30fbc 495 log_error("failed to poll: %m\n");
912541b0
KS		 496 goto out;
497 }
498 if (fdcount == 0) {
baa30fbc 499 log_error("timeout '%s'\n", cmd);
912541b0
KS		 500 goto out;
501 }
502
503 for (i = 0; i < fdcount; i++) {
504 int *fd = (int *)ev[i].data.ptr;
505
506 if (ev[i].events & EPOLLIN) {
507 ssize_t count;
508 char buf[4096];
509
510 count = read(*fd, buf, sizeof(buf)-1);
511 if (count <= 0)
512 continue;
513 buf[count] = '\0';
514
515 /* store stdout result */
516 if (result != NULL && *fd == fd_stdout) {
517 if (respos + count < ressize) {
518 memcpy(&result[respos], buf, count);
519 respos += count;
520 } else {
baa30fbc 521 log_error("'%s' ressize %zd too short\n", cmd, ressize);
912541b0
KS		 522 }
523 }
524
525 /* log debug output only if we watch stderr */
526 if (fd_stderr >= 0) {
527 char *pos;
528 char *line;
529
530 pos = buf;
531 while ((line = strsep(&pos, "\n"))) {
532 if (pos != NULL || line[0] != '\0')
baa30fbc 533 log_debug("'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
912541b0
KS		 534 }
535 }
536 } else if (ev[i].events & EPOLLHUP) {
537 if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
baa30fbc 538 log_error("failed to remove fd from epoll: %m\n");
912541b0
KS		 539 goto out;
540 }
541 *fd = -1;
542 }
543 }
544 }
545
546 /* return the child's stdout string */
baa30fbc 547 if (result != NULL)
912541b0 548 result[respos] = '\0';
2181d30a 549out:
912541b0
KS		 550 if (fd_ep >= 0)
551 close(fd_ep);
2181d30a
KS		 552}
553
554static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
555{
912541b0
KS		 556 struct udev *udev = event->udev;
557 struct pollfd pfd[1];
558 int err = 0;
559
560 pfd[0].events = POLLIN;
561 pfd[0].fd = event->fd_signal;
562
563 while (pid > 0) {
564 int timeout;
565 int fdcount;
566
567 if (event->timeout_usec > 0) {
568 unsigned long long age_usec;
569
570 age_usec = now_usec() - event->birth_usec;
571 if (age_usec >= event->timeout_usec)
572 timeout = 1000;
573 else
574 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
575 } else {
576 timeout = -1;
577 }
578
579 fdcount = poll(pfd, 1, timeout);
580 if (fdcount < 0) {
581 if (errno == EINTR)
582 continue;
583 err = -errno;
baa30fbc 584 log_error("failed to poll: %m\n");
912541b0
KS		 585 goto out;
586 }
587 if (fdcount == 0) {
baa30fbc 588 log_error("timeout: killing '%s' [%u]\n", cmd, pid);
912541b0
KS		 589 kill(pid, SIGKILL);
590 }
591
592 if (pfd[0].revents & POLLIN) {
593 struct signalfd_siginfo fdsi;
594 int status;
595 ssize_t size;
596
597 size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
598 if (size != sizeof(struct signalfd_siginfo))
599 continue;
600
601 switch (fdsi.ssi_signo) {
602 case SIGTERM:
603 event->sigterm = true;
604 break;
605 case SIGCHLD:
606 if (waitpid(pid, &status, WNOHANG) < 0)
607 break;
608 if (WIFEXITED(status)) {
baa30fbc 609 log_debug("'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
912541b0
KS		 610 if (WEXITSTATUS(status) != 0)
611 err = -1;
612 } else if (WIFSIGNALED(status)) {
baa30fbc 613 log_error("'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
912541b0
KS		 614 err = -1;
615 } else if (WIFSTOPPED(status)) {
baa30fbc 616 log_error("'%s' [%u] stopped\n", cmd, pid);
912541b0
KS		 617 err = -1;
618 } else if (WIFCONTINUED(status)) {
baa30fbc 619 log_error("'%s' [%u] continued\n", cmd, pid);
912541b0
KS		 620 err = -1;
621 } else {
baa30fbc 622 log_error("'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
912541b0
KS		 623 err = -1;
624 }
625 pid = 0;
626 break;
627 }
628 }
629 }
2181d30a 630out:
912541b0 631 return err;
2181d30a
KS		 632}
633
e216e514
KS		 634int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[])
635{
912541b0
KS		 636 int i = 0;
637 char *pos;
638
639 if (strchr(cmd, ' ') == NULL) {
640 argv[i++] = cmd;
641 goto out;
642 }
643
644 pos = cmd;
645 while (pos != NULL && pos[0] != '\0') {
646 if (pos[0] == '\'') {
647 /* do not separate quotes */
648 pos++;
649 argv[i] = strsep(&pos, "\'");
650 if (pos != NULL)
651 while (pos[0] == ' ')
652 pos++;
653 } else {
654 argv[i] = strsep(&pos, " ");
655 if (pos != NULL)
656 while (pos[0] == ' ')
657 pos++;
658 }
912541b0
KS		 659 i++;
660 }
e216e514 661out:
912541b0
KS		 662 argv[i] = NULL;
663 if (argc)
664 *argc = i;
665 return 0;
e216e514
KS		 666}
667
2181d30a 668int udev_event_spawn(struct udev_event *event,
912541b0
KS		 669 const char *cmd, char **envp, const sigset_t *sigmask,
670 char *result, size_t ressize)
2181d30a 671{
912541b0
KS		 672 struct udev *udev = event->udev;
673 int outpipe[2] = {-1, -1};
674 int errpipe[2] = {-1, -1};
675 pid_t pid;
676 char arg[UTIL_PATH_SIZE];
677 char *argv[128];
678 char program[UTIL_PATH_SIZE];
679 int err = 0;
680
681 util_strscpy(arg, sizeof(arg), cmd);
682 udev_build_argv(event->udev, arg, NULL, argv);
683
684 /* pipes from child to parent */
685 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
686 if (pipe2(outpipe, O_NONBLOCK) != 0) {
687 err = -errno;
baa30fbc 688 log_error("pipe failed: %m\n");
912541b0
KS		 689 goto out;
690 }
691 }
692 if (udev_get_log_priority(udev) >= LOG_INFO) {
693 if (pipe2(errpipe, O_NONBLOCK) != 0) {
694 err = -errno;
baa30fbc 695 log_error("pipe failed: %m\n");
912541b0
KS		 696 goto out;
697 }
698 }
699
700 /* allow programs in /usr/lib/udev/ to be called without the path */
701 if (argv[0][0] != '/') {
3e214785 702 util_strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
912541b0
KS		 703 argv[0] = program;
704 }
705
706 pid = fork();
707 switch(pid) {
708 case 0:
709 /* child closes parent's ends of pipes */
710 if (outpipe[READ_END] >= 0) {
711 close(outpipe[READ_END]);
712 outpipe[READ_END] = -1;
713 }
714 if (errpipe[READ_END] >= 0) {
715 close(errpipe[READ_END]);
716 errpipe[READ_END] = -1;
717 }
718
baa30fbc 719 log_debug("starting '%s'\n", cmd);
912541b0
KS		 720
721 err = spawn_exec(event, cmd, argv, envp, sigmask,
722 outpipe[WRITE_END], errpipe[WRITE_END]);
723
724 _exit(2 );
725 case -1:
baa30fbc 726 log_error("fork of '%s' failed: %m\n", cmd);
912541b0
KS		 727 err = -1;
728 goto out;
729 default:
730 /* parent closed child's ends of pipes */
731 if (outpipe[WRITE_END] >= 0) {
732 close(outpipe[WRITE_END]);
733 outpipe[WRITE_END] = -1;
734 }
735 if (errpipe[WRITE_END] >= 0) {
736 close(errpipe[WRITE_END]);
737 errpipe[WRITE_END] = -1;
738 }
739
740 spawn_read(event, cmd,
741 outpipe[READ_END], errpipe[READ_END],
742 result, ressize);
743
744 err = spawn_wait(event, cmd, pid);
745 }
2181d30a
KS		 746
747out:
912541b0
KS		 748 if (outpipe[READ_END] >= 0)
749 close(outpipe[READ_END]);
750 if (outpipe[WRITE_END] >= 0)
751 close(outpipe[WRITE_END]);
752 if (errpipe[READ_END] >= 0)
753 close(errpipe[READ_END]);
754 if (errpipe[WRITE_END] >= 0)
755 close(errpipe[WRITE_END]);
756 return err;
2181d30a
KS		 757}
758
f1128767 759static void rename_netif_kernel_log(struct ifreq ifr)
d46f37fd 760{
912541b0
KS		 761 int klog;
762 FILE *f;
763
764 klog = open("/dev/kmsg", O_WRONLY);
765 if (klog < 0)
766 return;
767
768 f = fdopen(klog, "w");
769 if (f == NULL) {
770 close(klog);
771 return;
772 }
773
774 fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
775 getpid(), ifr.ifr_name, ifr.ifr_newname);
776 fclose(f);
d46f37fd
KS		 777}
778
aa8734ff 779static int rename_netif(struct udev_event *event)
d46f37fd 780{
912541b0
KS		 781 struct udev_device *dev = event->dev;
782 int sk;
783 struct ifreq ifr;
784 int loop;
785 int err;
786
baa30fbc
KS		 787 log_debug("changing net interface name from '%s' to '%s'\n",
788 udev_device_get_sysname(dev), event->name);
912541b0
KS		 789
790 sk = socket(PF_INET, SOCK_DGRAM, 0);
791 if (sk < 0) {
792 err = -errno;
baa30fbc 793 log_error("error opening socket: %m\n");
912541b0
KS		 794 return err;
795 }
796
797 memset(&ifr, 0x00, sizeof(struct ifreq));
798 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
799 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
800 err = ioctl(sk, SIOCSIFNAME, &ifr);
801 if (err == 0) {
802 rename_netif_kernel_log(ifr);
803 goto out;
804 }
805
806 /* keep trying if the destination interface name already exists */
807 err = -errno;
808 if (err != -EEXIST)
809 goto out;
810
811 /* free our own name, another process may wait for us */
812 snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
813 err = ioctl(sk, SIOCSIFNAME, &ifr);
814 if (err < 0) {
815 err = -errno;
816 goto out;
817 }
818
819 /* log temporary name */
820 rename_netif_kernel_log(ifr);
821
822 /* wait a maximum of 90 seconds for our target to become available */
823 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
824 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
825 loop = 90 * 20;
826 while (loop--) {
827 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
828
912541b0
KS		 829 nanosleep(&duration, NULL);
830
831 err = ioctl(sk, SIOCSIFNAME, &ifr);
832 if (err == 0) {
833 rename_netif_kernel_log(ifr);
834 break;
835 }
836 err = -errno;
837 if (err != -EEXIST)
838 break;
839 }
ce9a42be
KS		 840
841out:
912541b0 842 if (err < 0)
baa30fbc 843 log_error("error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
912541b0
KS		 844 close(sk);
845 return err;
d46f37fd
KS		 846}
847
2181d30a 848int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
d46f37fd 849{
912541b0
KS		 850 struct udev_device *dev = event->dev;
851 int err = 0;
852
853 if (udev_device_get_subsystem(dev) == NULL)
854 return -1;
855
856 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
857 udev_device_read_db(dev, NULL);
858 udev_device_delete_db(dev);
859 udev_device_tag_index(dev, NULL, false);
860
861 if (major(udev_device_get_devnum(dev)) != 0)
862 udev_watch_end(event->udev, dev);
863
864 udev_rules_apply_to_event(rules, event, sigmask);
865
866 if (major(udev_device_get_devnum(dev)) != 0)
e7f32890 867 udev_node_remove(dev);
912541b0
KS		 868 } else {
869 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
870 if (event->dev_db != NULL) {
871 udev_device_read_db(event->dev_db, NULL);
872 udev_device_set_info_loaded(event->dev_db);
873
874 /* disable watch during event processing */
875 if (major(udev_device_get_devnum(dev)) != 0)
876 udev_watch_end(event->udev, event->dev_db);
877 }
878
879 udev_rules_apply_to_event(rules, event, sigmask);
880
881 /* rename a new network interface, if needed */
882 if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
883 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
884 char syspath[UTIL_PATH_SIZE];
885 char *pos;
886
887 err = rename_netif(event);
888 if (err == 0) {
baa30fbc 889 log_debug("renamed netif to '%s'\n", event->name);
912541b0
KS		 890
891 /* remember old name */
892 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
893
894 /* now change the devpath, because the kernel device name has changed */
895 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
896 pos = strrchr(syspath, '/');
897 if (pos != NULL) {
898 pos++;
899 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
900 udev_device_set_syspath(event->dev, syspath);
901 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
baa30fbc 902 log_debug("changed devpath to '%s'\n", udev_device_get_devpath(dev));
912541b0
KS		 903 }
904 }
905 }
906
b0a00806 907 if (major(udev_device_get_devnum(dev)) > 0) {
912541b0
KS		 908 /* remove/update possible left-over symlinks from old database entry */
909 if (event->dev_db != NULL)
910 udev_node_update_old_links(dev, event->dev_db);
911
912 if (!event->mode_set) {
913 if (udev_device_get_devnode_mode(dev) > 0) {
914 /* kernel supplied value */
915 event->mode = udev_device_get_devnode_mode(dev);
916 } else if (event->gid > 0) {
917 /* default 0660 if a group is assigned */
918 event->mode = 0660;
919 } else {
920 /* default 0600 */
921 event->mode = 0600;
922 }
923 }
924
e7f32890 925 udev_node_add(dev, event->mode, event->uid, event->gid);
912541b0
KS		 926 }
927
928 /* preserve old, or get new initialization timestamp */
929 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
930 udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
931 else if (udev_device_get_usec_initialized(event->dev) == 0)
932 udev_device_set_usec_initialized(event->dev, now_usec());
933
934 /* (re)write database file */
935 udev_device_update_db(dev);
936 udev_device_tag_index(dev, event->dev_db, true);
937 udev_device_set_is_initialized(dev);
938
939 udev_device_unref(event->dev_db);
940 event->dev_db = NULL;
941 }
0ec5b5e1 942out:
912541b0 943 return err;
d46f37fd 944}
2d73813e 945
d412a685 946int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
2d73813e 947{
912541b0
KS		 948 struct udev_list_entry *list_entry;
949 int err = 0;
950
912541b0
KS		 951 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
952 const char *cmd = udev_list_entry_get_name(list_entry);
953
954 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
955 struct udev_monitor *monitor;
956
957 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
958 if (monitor == NULL)
959 continue;
960 udev_monitor_send_device(monitor, NULL, event->dev);
961 udev_monitor_unref(monitor);
962 } else {
963 char program[UTIL_PATH_SIZE];
964 char **envp;
965
966 if (event->exec_delay > 0) {
baa30fbc 967 log_debug("delay execution of '%s'\n", program);
912541b0
KS		 968 sleep(event->exec_delay);
969 }
970
971 udev_event_apply_format(event, cmd, program, sizeof(program));
972 envp = udev_device_get_properties_envp(event->dev);
973 if (udev_event_spawn(event, program, envp, sigmask, NULL, 0) < 0) {
974 if (udev_list_entry_get_num(list_entry))
975 err = -1;
976 }
977 }
978 }
979 return err;
2d73813e 980}
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