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fix a couple of things found with the llvm static analyzer
[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 {
04a9d3a0
KS		 89 const char *name;
90 const char fmt;
912541b0
KS		 91 enum subst_type type;
92 } map[] = {
93 { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
94 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
95 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
96 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
97 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
98 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
99 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
100 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
101 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
102 { .name = "id", .fmt = 'b', .type = SUBST_ID },
103 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
104 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
105 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
106 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
107 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
108 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
109 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
110 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
111 };
112 const char *from;
113 char *s;
114 size_t l;
115
116 from = src;
117 s = dest;
118 l = size;
119
120 for (;;) {
121 enum subst_type type = SUBST_UNKNOWN;
122 char attrbuf[UTIL_PATH_SIZE];
123 char *attr = NULL;
124
125 while (from[0] != '\0') {
126 if (from[0] == '$') {
127 /* substitute named variable */
128 unsigned int i;
129
130 if (from[1] == '$') {
131 from++;
132 goto copy;
133 }
134
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 int err;
390 int fd;
391
392 /* discard child output or connect to pipe */
393 fd = open("/dev/null", O_RDWR);
394 if (fd >= 0) {
395 dup2(fd, STDIN_FILENO);
396 if (fd_stdout < 0)
397 dup2(fd, STDOUT_FILENO);
398 if (fd_stderr < 0)
399 dup2(fd, STDERR_FILENO);
400 close(fd);
401 } else {
baa30fbc 402 log_error("open /dev/null failed: %m\n");
912541b0
KS		 403 }
404
405 /* connect pipes to std{out,err} */
406 if (fd_stdout >= 0) {
407 dup2(fd_stdout, STDOUT_FILENO);
408 close(fd_stdout);
409 }
410 if (fd_stderr >= 0) {
411 dup2(fd_stderr, STDERR_FILENO);
412 close(fd_stderr);
413 }
414
415 /* terminate child in case parent goes away */
416 prctl(PR_SET_PDEATHSIG, SIGTERM);
417
418 /* restore original udev sigmask before exec */
419 if (sigmask)
420 sigprocmask(SIG_SETMASK, sigmask, NULL);
421
422 execve(argv[0], argv, envp);
423
424 /* exec failed */
425 err = -errno;
baa30fbc 426 log_error("failed to execute '%s' '%s': %m\n", argv[0], cmd);
912541b0 427 return err;
2181d30a
KS		 428}
429
f18f225c 430static void spawn_read(struct udev_event *event,
912541b0
KS		 431 const char *cmd,
432 int fd_stdout, int fd_stderr,
433 char *result, size_t ressize)
2181d30a 434{
912541b0
KS		 435 size_t respos = 0;
436 int fd_ep = -1;
437 struct epoll_event ep_outpipe, ep_errpipe;
438
439 /* read from child if requested */
440 if (fd_stdout < 0 && fd_stderr < 0)
441 return;
442
443 fd_ep = epoll_create1(EPOLL_CLOEXEC);
444 if (fd_ep < 0) {
baa30fbc 445 log_error("error creating epoll fd: %m\n");
912541b0
KS		 446 goto out;
447 }
448
449 if (fd_stdout >= 0) {
450 memset(&ep_outpipe, 0, sizeof(struct epoll_event));
451 ep_outpipe.events = EPOLLIN;
452 ep_outpipe.data.ptr = &fd_stdout;
453 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
baa30fbc 454 log_error("fail to add fd to epoll: %m\n");
912541b0
KS		 455 goto out;
456 }
457 }
458
459 if (fd_stderr >= 0) {
460 memset(&ep_errpipe, 0, sizeof(struct epoll_event));
461 ep_errpipe.events = EPOLLIN;
462 ep_errpipe.data.ptr = &fd_stderr;
463 if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
baa30fbc 464 log_error("fail to add fd to epoll: %m\n");
912541b0
KS		 465 goto out;
466 }
467 }
468
469 /* read child output */
470 while (fd_stdout >= 0 || fd_stderr >= 0) {
471 int timeout;
472 int fdcount;
473 struct epoll_event ev[4];
474 int i;
475
476 if (event->timeout_usec > 0) {
477 unsigned long long age_usec;
478
479 age_usec = now_usec() - event->birth_usec;
480 if (age_usec >= event->timeout_usec) {
baa30fbc 481 log_error("timeout '%s'\n", cmd);
912541b0
KS		 482 goto out;
483 }
484 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
485 } else {
486 timeout = -1;
487 }
488
489 fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
490 if (fdcount < 0) {
491 if (errno == EINTR)
492 continue;
baa30fbc 493 log_error("failed to poll: %m\n");
912541b0
KS		 494 goto out;
495 }
496 if (fdcount == 0) {
baa30fbc 497 log_error("timeout '%s'\n", cmd);
912541b0
KS		 498 goto out;
499 }
500
501 for (i = 0; i < fdcount; i++) {
502 int *fd = (int *)ev[i].data.ptr;
503
504 if (ev[i].events & EPOLLIN) {
505 ssize_t count;
506 char buf[4096];
507
508 count = read(*fd, buf, sizeof(buf)-1);
509 if (count <= 0)
510 continue;
511 buf[count] = '\0';
512
513 /* store stdout result */
514 if (result != NULL && *fd == fd_stdout) {
515 if (respos + count < ressize) {
516 memcpy(&result[respos], buf, count);
517 respos += count;
518 } else {
baa30fbc 519 log_error("'%s' ressize %zd too short\n", cmd, ressize);
912541b0
KS		 520 }
521 }
522
523 /* log debug output only if we watch stderr */
524 if (fd_stderr >= 0) {
525 char *pos;
526 char *line;
527
528 pos = buf;
529 while ((line = strsep(&pos, "\n"))) {
530 if (pos != NULL || line[0] != '\0')
baa30fbc 531 log_debug("'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
912541b0
KS		 532 }
533 }
534 } else if (ev[i].events & EPOLLHUP) {
535 if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
baa30fbc 536 log_error("failed to remove fd from epoll: %m\n");
912541b0
KS		 537 goto out;
538 }
539 *fd = -1;
540 }
541 }
542 }
543
544 /* return the child's stdout string */
baa30fbc 545 if (result != NULL)
912541b0 546 result[respos] = '\0';
2181d30a 547out:
912541b0
KS		 548 if (fd_ep >= 0)
549 close(fd_ep);
2181d30a
KS		 550}
551
552static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
553{
912541b0
KS		 554 struct pollfd pfd[1];
555 int err = 0;
556
557 pfd[0].events = POLLIN;
558 pfd[0].fd = event->fd_signal;
559
560 while (pid > 0) {
561 int timeout;
562 int fdcount;
563
564 if (event->timeout_usec > 0) {
565 unsigned long long age_usec;
566
567 age_usec = now_usec() - event->birth_usec;
568 if (age_usec >= event->timeout_usec)
569 timeout = 1000;
570 else
571 timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
572 } else {
573 timeout = -1;
574 }
575
576 fdcount = poll(pfd, 1, timeout);
577 if (fdcount < 0) {
578 if (errno == EINTR)
579 continue;
580 err = -errno;
baa30fbc 581 log_error("failed to poll: %m\n");
912541b0
KS		 582 goto out;
583 }
584 if (fdcount == 0) {
baa30fbc 585 log_error("timeout: killing '%s' [%u]\n", cmd, pid);
912541b0
KS		 586 kill(pid, SIGKILL);
587 }
588
589 if (pfd[0].revents & POLLIN) {
590 struct signalfd_siginfo fdsi;
591 int status;
592 ssize_t size;
593
594 size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
595 if (size != sizeof(struct signalfd_siginfo))
596 continue;
597
598 switch (fdsi.ssi_signo) {
599 case SIGTERM:
600 event->sigterm = true;
601 break;
602 case SIGCHLD:
603 if (waitpid(pid, &status, WNOHANG) < 0)
604 break;
605 if (WIFEXITED(status)) {
baa30fbc 606 log_debug("'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
912541b0
KS		 607 if (WEXITSTATUS(status) != 0)
608 err = -1;
609 } else if (WIFSIGNALED(status)) {
baa30fbc 610 log_error("'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
912541b0
KS		 611 err = -1;
612 } else if (WIFSTOPPED(status)) {
baa30fbc 613 log_error("'%s' [%u] stopped\n", cmd, pid);
912541b0
KS		 614 err = -1;
615 } else if (WIFCONTINUED(status)) {
baa30fbc 616 log_error("'%s' [%u] continued\n", cmd, pid);
912541b0
KS		 617 err = -1;
618 } else {
baa30fbc 619 log_error("'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
912541b0
KS		 620 err = -1;
621 }
622 pid = 0;
623 break;
624 }
625 }
626 }
2181d30a 627out:
912541b0 628 return err;
2181d30a
KS		 629}
630
e216e514
KS		 631int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[])
632{
912541b0
KS		 633 int i = 0;
634 char *pos;
635
636 if (strchr(cmd, ' ') == NULL) {
637 argv[i++] = cmd;
638 goto out;
639 }
640
641 pos = cmd;
642 while (pos != NULL && pos[0] != '\0') {
643 if (pos[0] == '\'') {
644 /* do not separate quotes */
645 pos++;
646 argv[i] = strsep(&pos, "\'");
647 if (pos != NULL)
648 while (pos[0] == ' ')
649 pos++;
650 } else {
651 argv[i] = strsep(&pos, " ");
652 if (pos != NULL)
653 while (pos[0] == ' ')
654 pos++;
655 }
912541b0
KS		 656 i++;
657 }
e216e514 658out:
912541b0
KS		 659 argv[i] = NULL;
660 if (argc)
661 *argc = i;
662 return 0;
e216e514
KS		 663}
664
2181d30a 665int udev_event_spawn(struct udev_event *event,
912541b0
KS		 666 const char *cmd, char **envp, const sigset_t *sigmask,
667 char *result, size_t ressize)
2181d30a 668{
912541b0
KS		 669 struct udev *udev = event->udev;
670 int outpipe[2] = {-1, -1};
671 int errpipe[2] = {-1, -1};
672 pid_t pid;
673 char arg[UTIL_PATH_SIZE];
674 char *argv[128];
675 char program[UTIL_PATH_SIZE];
676 int err = 0;
677
678 util_strscpy(arg, sizeof(arg), cmd);
679 udev_build_argv(event->udev, arg, NULL, argv);
680
681 /* pipes from child to parent */
682 if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
683 if (pipe2(outpipe, O_NONBLOCK) != 0) {
684 err = -errno;
baa30fbc 685 log_error("pipe failed: %m\n");
912541b0
KS		 686 goto out;
687 }
688 }
689 if (udev_get_log_priority(udev) >= LOG_INFO) {
690 if (pipe2(errpipe, O_NONBLOCK) != 0) {
691 err = -errno;
baa30fbc 692 log_error("pipe failed: %m\n");
912541b0
KS		 693 goto out;
694 }
695 }
696
697 /* allow programs in /usr/lib/udev/ to be called without the path */
698 if (argv[0][0] != '/') {
3e214785 699 util_strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
912541b0
KS		 700 argv[0] = program;
701 }
702
703 pid = fork();
704 switch(pid) {
705 case 0:
706 /* child closes parent's ends of pipes */
707 if (outpipe[READ_END] >= 0) {
708 close(outpipe[READ_END]);
709 outpipe[READ_END] = -1;
710 }
711 if (errpipe[READ_END] >= 0) {
712 close(errpipe[READ_END]);
713 errpipe[READ_END] = -1;
714 }
715
baa30fbc 716 log_debug("starting '%s'\n", cmd);
912541b0
KS		 717
718 err = spawn_exec(event, cmd, argv, envp, sigmask,
719 outpipe[WRITE_END], errpipe[WRITE_END]);
720
721 _exit(2 );
722 case -1:
baa30fbc 723 log_error("fork of '%s' failed: %m\n", cmd);
912541b0
KS		 724 err = -1;
725 goto out;
726 default:
727 /* parent closed child's ends of pipes */
728 if (outpipe[WRITE_END] >= 0) {
729 close(outpipe[WRITE_END]);
730 outpipe[WRITE_END] = -1;
731 }
732 if (errpipe[WRITE_END] >= 0) {
733 close(errpipe[WRITE_END]);
734 errpipe[WRITE_END] = -1;
735 }
736
737 spawn_read(event, cmd,
738 outpipe[READ_END], errpipe[READ_END],
739 result, ressize);
740
741 err = spawn_wait(event, cmd, pid);
742 }
2181d30a
KS		 743
744out:
912541b0
KS		 745 if (outpipe[READ_END] >= 0)
746 close(outpipe[READ_END]);
747 if (outpipe[WRITE_END] >= 0)
748 close(outpipe[WRITE_END]);
749 if (errpipe[READ_END] >= 0)
750 close(errpipe[READ_END]);
751 if (errpipe[WRITE_END] >= 0)
752 close(errpipe[WRITE_END]);
753 return err;
2181d30a
KS		 754}
755
f1128767 756static void rename_netif_kernel_log(struct ifreq ifr)
d46f37fd 757{
912541b0
KS		 758 int klog;
759 FILE *f;
760
761 klog = open("/dev/kmsg", O_WRONLY);
762 if (klog < 0)
763 return;
764
765 f = fdopen(klog, "w");
766 if (f == NULL) {
767 close(klog);
768 return;
769 }
770
771 fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
772 getpid(), ifr.ifr_name, ifr.ifr_newname);
773 fclose(f);
d46f37fd
KS		 774}
775
aa8734ff 776static int rename_netif(struct udev_event *event)
d46f37fd 777{
912541b0
KS		 778 struct udev_device *dev = event->dev;
779 int sk;
780 struct ifreq ifr;
781 int loop;
782 int err;
783
baa30fbc
KS		 784 log_debug("changing net interface name from '%s' to '%s'\n",
785 udev_device_get_sysname(dev), event->name);
912541b0
KS		 786
787 sk = socket(PF_INET, SOCK_DGRAM, 0);
788 if (sk < 0) {
789 err = -errno;
baa30fbc 790 log_error("error opening socket: %m\n");
912541b0
KS		 791 return err;
792 }
793
794 memset(&ifr, 0x00, sizeof(struct ifreq));
795 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
796 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
797 err = ioctl(sk, SIOCSIFNAME, &ifr);
798 if (err == 0) {
799 rename_netif_kernel_log(ifr);
800 goto out;
801 }
802
803 /* keep trying if the destination interface name already exists */
804 err = -errno;
805 if (err != -EEXIST)
806 goto out;
807
808 /* free our own name, another process may wait for us */
809 snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
810 err = ioctl(sk, SIOCSIFNAME, &ifr);
811 if (err < 0) {
812 err = -errno;
813 goto out;
814 }
815
816 /* log temporary name */
817 rename_netif_kernel_log(ifr);
818
819 /* wait a maximum of 90 seconds for our target to become available */
820 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
821 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
822 loop = 90 * 20;
823 while (loop--) {
824 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
825
912541b0
KS		 826 nanosleep(&duration, NULL);
827
828 err = ioctl(sk, SIOCSIFNAME, &ifr);
829 if (err == 0) {
830 rename_netif_kernel_log(ifr);
831 break;
832 }
833 err = -errno;
834 if (err != -EEXIST)
835 break;
836 }
ce9a42be
KS		 837
838out:
912541b0 839 if (err < 0)
baa30fbc 840 log_error("error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
912541b0
KS		 841 close(sk);
842 return err;
d46f37fd
KS		 843}
844
2181d30a 845int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
d46f37fd 846{
912541b0
KS		 847 struct udev_device *dev = event->dev;
848 int err = 0;
849
850 if (udev_device_get_subsystem(dev) == NULL)
851 return -1;
852
853 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
854 udev_device_read_db(dev, NULL);
855 udev_device_delete_db(dev);
856 udev_device_tag_index(dev, NULL, false);
857
858 if (major(udev_device_get_devnum(dev)) != 0)
859 udev_watch_end(event->udev, dev);
860
861 udev_rules_apply_to_event(rules, event, sigmask);
862
863 if (major(udev_device_get_devnum(dev)) != 0)
e7f32890 864 udev_node_remove(dev);
912541b0
KS		 865 } else {
866 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
867 if (event->dev_db != NULL) {
868 udev_device_read_db(event->dev_db, NULL);
869 udev_device_set_info_loaded(event->dev_db);
870
871 /* disable watch during event processing */
872 if (major(udev_device_get_devnum(dev)) != 0)
873 udev_watch_end(event->udev, event->dev_db);
874 }
875
876 udev_rules_apply_to_event(rules, event, sigmask);
877
878 /* rename a new network interface, if needed */
879 if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
880 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
881 char syspath[UTIL_PATH_SIZE];
882 char *pos;
883
884 err = rename_netif(event);
885 if (err == 0) {
baa30fbc 886 log_debug("renamed netif to '%s'\n", event->name);
912541b0
KS		 887
888 /* remember old name */
889 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
890
891 /* now change the devpath, because the kernel device name has changed */
892 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
893 pos = strrchr(syspath, '/');
894 if (pos != NULL) {
895 pos++;
896 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
897 udev_device_set_syspath(event->dev, syspath);
898 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
baa30fbc 899 log_debug("changed devpath to '%s'\n", udev_device_get_devpath(dev));
912541b0
KS		 900 }
901 }
902 }
903
b0a00806 904 if (major(udev_device_get_devnum(dev)) > 0) {
912541b0
KS		 905 /* remove/update possible left-over symlinks from old database entry */
906 if (event->dev_db != NULL)
907 udev_node_update_old_links(dev, event->dev_db);
908
909 if (!event->mode_set) {
910 if (udev_device_get_devnode_mode(dev) > 0) {
911 /* kernel supplied value */
912 event->mode = udev_device_get_devnode_mode(dev);
913 } else if (event->gid > 0) {
914 /* default 0660 if a group is assigned */
915 event->mode = 0660;
916 } else {
917 /* default 0600 */
918 event->mode = 0600;
919 }
920 }
921
e7f32890 922 udev_node_add(dev, event->mode, event->uid, event->gid);
912541b0
KS		 923 }
924
925 /* preserve old, or get new initialization timestamp */
926 if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
927 udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
928 else if (udev_device_get_usec_initialized(event->dev) == 0)
929 udev_device_set_usec_initialized(event->dev, now_usec());
930
931 /* (re)write database file */
932 udev_device_update_db(dev);
933 udev_device_tag_index(dev, event->dev_db, true);
934 udev_device_set_is_initialized(dev);
935
936 udev_device_unref(event->dev_db);
937 event->dev_db = NULL;
938 }
912541b0 939 return err;
d46f37fd 940}
2d73813e 941
83cd6b75 942void udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
2d73813e 943{
912541b0 944 struct udev_list_entry *list_entry;
912541b0 945
912541b0
KS		 946 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
947 const char *cmd = udev_list_entry_get_name(list_entry);
83cd6b75
KS		 948 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
949
950 if (builtin_cmd < UDEV_BUILTIN_MAX) {
951 char command[UTIL_PATH_SIZE];
912541b0 952
83cd6b75
KS		 953 udev_event_apply_format(event, cmd, command, sizeof(command));
954 udev_builtin_run(event->dev, builtin_cmd, command, false);
912541b0
KS		 955 } else {
956 char program[UTIL_PATH_SIZE];
957 char **envp;
958
959 if (event->exec_delay > 0) {
baa30fbc 960 log_debug("delay execution of '%s'\n", program);
912541b0
KS		 961 sleep(event->exec_delay);
962 }
963
964 udev_event_apply_format(event, cmd, program, sizeof(program));
965 envp = udev_device_get_properties_envp(event->dev);
83cd6b75 966 udev_event_spawn(event, program, envp, sigmask, NULL, 0);
912541b0
KS		 967 }
968 }
2d73813e 969}
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