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[systemd.git] / src / udev / udev-event.c
CommitLineData
663996b3
MS		 1/*
2 * Copyright (C) 2003-2013 Kay Sievers <kay@vrfy.org>
3 *
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.
8 *
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/>.
16 */
17
663996b3 18#include <ctype.h>
db2df898
MP		 19#include <errno.h>
20#include <fcntl.h>
663996b3 21#include <net/if.h>
e735f4d4 22#include <poll.h>
db2df898
MP		 23#include <stddef.h>
24#include <stdio.h>
25#include <stdlib.h>
26#include <string.h>
663996b3 27#include <sys/epoll.h>
db2df898 28#include <sys/prctl.h>
663996b3 29#include <sys/signalfd.h>
db2df898
MP		 30#include <sys/wait.h>
31#include <unistd.h>
663996b3 32
db2df898 33#include "alloc-util.h"
db2df898 34#include "fd-util.h"
e3bff60a 35#include "formats-util.h"
db2df898 36#include "netlink-util.h"
86f210e9
MP		 37#include "process-util.h"
38#include "signal-util.h"
db2df898 39#include "string-util.h"
86f210e9
MP		 40#include "udev.h"
41
42typedef struct Spawn {
43 const char *cmd;
44 pid_t pid;
45 usec_t timeout_warn;
46 usec_t timeout;
47 bool accept_failure;
48} Spawn;
663996b3 49
5eef597e 50struct udev_event *udev_event_new(struct udev_device *dev) {
663996b3
MS		 51 struct udev *udev = udev_device_get_udev(dev);
52 struct udev_event *event;
53
60f067b4 54 event = new0(struct udev_event, 1);
663996b3
MS		 55 if (event == NULL)
56 return NULL;
57 event->dev = dev;
58 event->udev = udev;
59 udev_list_init(udev, &event->run_list, false);
60f067b4 60 udev_list_init(udev, &event->seclabel_list, false);
86f210e9 61 event->birth_usec = clock_boottime_or_monotonic();
663996b3
MS		 62 return event;
63}
64
5eef597e 65void udev_event_unref(struct udev_event *event) {
663996b3
MS		 66 if (event == NULL)
67 return;
86f210e9 68 sd_netlink_unref(event->rtnl);
663996b3 69 udev_list_cleanup(&event->run_list);
60f067b4 70 udev_list_cleanup(&event->seclabel_list);
663996b3
MS		 71 free(event->program_result);
72 free(event->name);
73 free(event);
74}
75
5eef597e 76size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size) {
663996b3
MS		 77 struct udev_device *dev = event->dev;
78 enum subst_type {
79 SUBST_UNKNOWN,
80 SUBST_DEVNODE,
81 SUBST_ATTR,
82 SUBST_ENV,
83 SUBST_KERNEL,
84 SUBST_KERNEL_NUMBER,
85 SUBST_DRIVER,
86 SUBST_DEVPATH,
87 SUBST_ID,
88 SUBST_MAJOR,
89 SUBST_MINOR,
90 SUBST_RESULT,
91 SUBST_PARENT,
92 SUBST_NAME,
93 SUBST_LINKS,
94 SUBST_ROOT,
95 SUBST_SYS,
96 };
97 static const struct subst_map {
98 const char *name;
99 const char fmt;
100 enum subst_type type;
101 } map[] = {
102 { .name = "devnode", .fmt = 'N', .type = SUBST_DEVNODE },
103 { .name = "tempnode", .fmt = 'N', .type = SUBST_DEVNODE },
104 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
105 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
106 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
107 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
108 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
109 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
110 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
111 { .name = "id", .fmt = 'b', .type = SUBST_ID },
112 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
113 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
114 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
115 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
116 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
117 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
118 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
119 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
120 };
121 const char *from;
122 char *s;
123 size_t l;
124
86f210e9
MP		 125 assert(dev);
126
663996b3
MS		 127 from = src;
128 s = dest;
129 l = size;
130
131 for (;;) {
132 enum subst_type type = SUBST_UNKNOWN;
133 char attrbuf[UTIL_PATH_SIZE];
134 char *attr = NULL;
135
136 while (from[0] != '\0') {
137 if (from[0] == '$') {
138 /* substitute named variable */
139 unsigned int i;
140
141 if (from[1] == '$') {
142 from++;
143 goto copy;
144 }
145
146 for (i = 0; i < ELEMENTSOF(map); i++) {
147 if (startswith(&from[1], map[i].name)) {
148 type = map[i].type;
149 from += strlen(map[i].name)+1;
150 goto subst;
151 }
152 }
153 } else if (from[0] == '%') {
154 /* substitute format char */
155 unsigned int i;
156
157 if (from[1] == '%') {
158 from++;
159 goto copy;
160 }
161
162 for (i = 0; i < ELEMENTSOF(map); i++) {
163 if (from[1] == map[i].fmt) {
164 type = map[i].type;
165 from += 2;
166 goto subst;
167 }
168 }
169 }
170copy:
171 /* copy char */
172 if (l == 0)
173 goto out;
174 s[0] = from[0];
175 from++;
176 s++;
177 l--;
178 }
179
180 goto out;
181subst:
182 /* extract possible $format{attr} */
183 if (from[0] == '{') {
184 unsigned int i;
185
186 from++;
187 for (i = 0; from[i] != '}'; i++) {
188 if (from[i] == '\0') {
60f067b4 189 log_error("missing closing brace for format '%s'", src);
663996b3
MS		 190 goto out;
191 }
192 }
193 if (i >= sizeof(attrbuf))
194 goto out;
195 memcpy(attrbuf, from, i);
196 attrbuf[i] = '\0';
197 from += i+1;
198 attr = attrbuf;
199 } else {
200 attr = NULL;
201 }
202
203 switch (type) {
204 case SUBST_DEVPATH:
205 l = strpcpy(&s, l, udev_device_get_devpath(dev));
206 break;
207 case SUBST_KERNEL:
208 l = strpcpy(&s, l, udev_device_get_sysname(dev));
209 break;
210 case SUBST_KERNEL_NUMBER:
211 if (udev_device_get_sysnum(dev) == NULL)
212 break;
213 l = strpcpy(&s, l, udev_device_get_sysnum(dev));
214 break;
215 case SUBST_ID:
216 if (event->dev_parent == NULL)
217 break;
218 l = strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
219 break;
220 case SUBST_DRIVER: {
221 const char *driver;
222
223 if (event->dev_parent == NULL)
224 break;
225
226 driver = udev_device_get_driver(event->dev_parent);
227 if (driver == NULL)
228 break;
229 l = strpcpy(&s, l, driver);
230 break;
231 }
232 case SUBST_MAJOR: {
233 char num[UTIL_PATH_SIZE];
234
e735f4d4 235 sprintf(num, "%u", major(udev_device_get_devnum(dev)));
663996b3
MS		 236 l = strpcpy(&s, l, num);
237 break;
238 }
239 case SUBST_MINOR: {
240 char num[UTIL_PATH_SIZE];
241
e735f4d4 242 sprintf(num, "%u", minor(udev_device_get_devnum(dev)));
663996b3
MS		 243 l = strpcpy(&s, l, num);
244 break;
245 }
246 case SUBST_RESULT: {
247 char *rest;
248 int i;
249
250 if (event->program_result == NULL)
251 break;
5a920b42 252 /* get part of the result string */
663996b3
MS		 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 strscpy(result, sizeof(result), event->program_result);
262 cpos = result;
263 while (--i) {
264 while (cpos[0] != '\0' && !isspace(cpos[0]))
265 cpos++;
266 while (isspace(cpos[0]))
267 cpos++;
60f067b4
JS		 268 if (cpos[0] == '\0')
269 break;
663996b3
MS		 270 }
271 if (i > 0) {
60f067b4 272 log_error("requested part of result string not found");
663996b3
MS		 273 break;
274 }
275 strscpy(tmp, sizeof(tmp), cpos);
276 /* %{2+}c copies the whole string from the second part on */
277 if (rest[0] != '+') {
278 cpos = strchr(tmp, ' ');
279 if (cpos)
280 cpos[0] = '\0';
281 }
282 l = strpcpy(&s, l, tmp);
283 } else {
284 l = strpcpy(&s, l, event->program_result);
285 }
286 break;
287 }
288 case SUBST_ATTR: {
289 const char *value = NULL;
290 char vbuf[UTIL_NAME_SIZE];
291 size_t len;
292 int count;
293
294 if (attr == NULL) {
60f067b4 295 log_error("missing file parameter for attr");
663996b3
MS		 296 break;
297 }
298
299 /* try to read the value specified by "[dmi/id]product_name" */
300 if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
301 value = vbuf;
302
303 /* try to read the attribute the device */
304 if (value == NULL)
305 value = udev_device_get_sysattr_value(event->dev, attr);
306
307 /* try to read the attribute of the parent device, other matches have selected */
308 if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
309 value = udev_device_get_sysattr_value(event->dev_parent, attr);
310
311 if (value == NULL)
312 break;
313
314 /* strip trailing whitespace, and replace unwanted characters */
315 if (value != vbuf)
316 strscpy(vbuf, sizeof(vbuf), value);
317 len = strlen(vbuf);
318 while (len > 0 && isspace(vbuf[--len]))
319 vbuf[len] = '\0';
320 count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
321 if (count > 0)
60f067b4 322 log_debug("%i character(s) replaced" , count);
663996b3
MS		 323 l = strpcpy(&s, l, vbuf);
324 break;
325 }
326 case SUBST_PARENT: {
327 struct udev_device *dev_parent;
328 const char *devnode;
329
330 dev_parent = udev_device_get_parent(event->dev);
331 if (dev_parent == NULL)
332 break;
333 devnode = udev_device_get_devnode(dev_parent);
334 if (devnode != NULL)
335 l = strpcpy(&s, l, devnode + strlen("/dev/"));
336 break;
337 }
338 case SUBST_DEVNODE:
339 if (udev_device_get_devnode(dev) != NULL)
340 l = strpcpy(&s, l, udev_device_get_devnode(dev));
341 break;
342 case SUBST_NAME:
343 if (event->name != NULL)
344 l = strpcpy(&s, l, event->name);
345 else if (udev_device_get_devnode(dev) != NULL)
346 l = strpcpy(&s, l, udev_device_get_devnode(dev) + strlen("/dev/"));
347 else
348 l = strpcpy(&s, l, udev_device_get_sysname(dev));
349 break;
350 case SUBST_LINKS: {
351 struct udev_list_entry *list_entry;
352
353 list_entry = udev_device_get_devlinks_list_entry(dev);
354 if (list_entry == NULL)
355 break;
356 l = strpcpy(&s, l, udev_list_entry_get_name(list_entry) + strlen("/dev/"));
357 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
358 l = strpcpyl(&s, l, " ", udev_list_entry_get_name(list_entry) + strlen("/dev/"), NULL);
359 break;
360 }
361 case SUBST_ROOT:
362 l = strpcpy(&s, l, "/dev");
363 break;
364 case SUBST_SYS:
365 l = strpcpy(&s, l, "/sys");
366 break;
367 case SUBST_ENV:
368 if (attr == NULL) {
369 break;
370 } else {
371 const char *value;
372
373 value = udev_device_get_property_value(event->dev, attr);
374 if (value == NULL)
375 break;
376 l = strpcpy(&s, l, value);
377 break;
378 }
379 default:
60f067b4 380 log_error("unknown substitution type=%i", type);
663996b3
MS		 381 break;
382 }
383 }
384
385out:
386 s[0] = '\0';
387 return l;
388}
389
390static int spawn_exec(struct udev_event *event,
86f210e9 391 const char *cmd, char *const argv[], char **envp,
5eef597e
MP		 392 int fd_stdout, int fd_stderr) {
393 _cleanup_close_ int fd = -1;
fb183854 394 int r;
663996b3
MS		 395
396 /* discard child output or connect to pipe */
397 fd = open("/dev/null", O_RDWR);
398 if (fd >= 0) {
fb183854
MP		 399 r = dup2(fd, STDIN_FILENO);
400 if (r < 0)
401 log_warning_errno(errno, "redirecting stdin failed: %m");
402
403 if (fd_stdout < 0) {
404 r = dup2(fd, STDOUT_FILENO);
405 if (r < 0)
406 log_warning_errno(errno, "redirecting stdout failed: %m");
407 }
408
409 if (fd_stderr < 0) {
410 r = dup2(fd, STDERR_FILENO);
411 if (r < 0)
412 log_warning_errno(errno, "redirecting stderr failed: %m");
413 }
5eef597e 414 } else
fb183854 415 log_warning_errno(errno, "open /dev/null failed: %m");
663996b3
MS		 416
417 /* connect pipes to std{out,err} */
418 if (fd_stdout >= 0) {
fb183854
MP		 419 r = dup2(fd_stdout, STDOUT_FILENO);
420 if (r < 0)
421 log_warning_errno(errno, "redirecting stdout failed: %m");
422
423 fd_stdout = safe_close(fd_stdout);
663996b3 424 }
fb183854 425
663996b3 426 if (fd_stderr >= 0) {
fb183854
MP		 427 r = dup2(fd_stderr, STDERR_FILENO);
428 if (r < 0)
429 log_warning_errno(errno, "redirecting stdout failed: %m");
430
431 fd_stderr = safe_close(fd_stderr);
663996b3
MS		 432 }
433
434 /* terminate child in case parent goes away */
435 prctl(PR_SET_PDEATHSIG, SIGTERM);
436
86f210e9
MP		 437 /* restore sigmask before exec */
438 (void) reset_signal_mask();
663996b3
MS		 439
440 execve(argv[0], argv, envp);
441
442 /* exec failed */
db2df898 443 return log_error_errno(errno, "failed to execute '%s' '%s': %m", argv[0], cmd);
663996b3
MS		 444}
445
446static void spawn_read(struct udev_event *event,
5eef597e
MP		 447 usec_t timeout_usec,
448 const char *cmd,
449 int fd_stdout, int fd_stderr,
450 char *result, size_t ressize) {
451 _cleanup_close_ int fd_ep = -1;
452 struct epoll_event ep_outpipe = {
453 .events = EPOLLIN,
454 .data.ptr = &fd_stdout,
455 };
456 struct epoll_event ep_errpipe = {
457 .events = EPOLLIN,
458 .data.ptr = &fd_stderr,
459 };
663996b3 460 size_t respos = 0;
5eef597e 461 int r;
663996b3
MS		 462
463 /* read from child if requested */
464 if (fd_stdout < 0 && fd_stderr < 0)
465 return;
466
467 fd_ep = epoll_create1(EPOLL_CLOEXEC);
468 if (fd_ep < 0) {
f47781d8 469 log_error_errno(errno, "error creating epoll fd: %m");
5eef597e 470 return;
663996b3
MS		 471 }
472
473 if (fd_stdout >= 0) {
5eef597e
MP		 474 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe);
475 if (r < 0) {
f47781d8 476 log_error_errno(errno, "fail to add stdout fd to epoll: %m");
5eef597e 477 return;
663996b3
MS		 478 }
479 }
480
481 if (fd_stderr >= 0) {
5eef597e
MP		 482 r = epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe);
483 if (r < 0) {
f47781d8 484 log_error_errno(errno, "fail to add stderr fd to epoll: %m");
5eef597e 485 return;
663996b3
MS		 486 }
487 }
488
489 /* read child output */
490 while (fd_stdout >= 0 || fd_stderr >= 0) {
491 int timeout;
492 int fdcount;
493 struct epoll_event ev[4];
494 int i;
495
5eef597e 496 if (timeout_usec > 0) {
663996b3
MS		 497 usec_t age_usec;
498
86f210e9 499 age_usec = clock_boottime_or_monotonic() - event->birth_usec;
5eef597e 500 if (age_usec >= timeout_usec) {
60f067b4 501 log_error("timeout '%s'", cmd);
5eef597e 502 return;
663996b3 503 }
5eef597e 504 timeout = ((timeout_usec - age_usec) / USEC_PER_MSEC) + MSEC_PER_SEC;
663996b3
MS		 505 } else {
506 timeout = -1;
507 }
508
509 fdcount = epoll_wait(fd_ep, ev, ELEMENTSOF(ev), timeout);
510 if (fdcount < 0) {
511 if (errno == EINTR)
512 continue;
f47781d8 513 log_error_errno(errno, "failed to poll: %m");
5eef597e
MP		 514 return;
515 } else if (fdcount == 0) {
60f067b4 516 log_error("timeout '%s'", cmd);
5eef597e 517 return;
663996b3
MS		 518 }
519
520 for (i = 0; i < fdcount; i++) {
521 int *fd = (int *)ev[i].data.ptr;
522
5eef597e
MP		 523 if (*fd < 0)
524 continue;
525
663996b3
MS		 526 if (ev[i].events & EPOLLIN) {
527 ssize_t count;
528 char buf[4096];
529
530 count = read(*fd, buf, sizeof(buf)-1);
531 if (count <= 0)
532 continue;
533 buf[count] = '\0';
534
535 /* store stdout result */
536 if (result != NULL && *fd == fd_stdout) {
537 if (respos + count < ressize) {
538 memcpy(&result[respos], buf, count);
539 respos += count;
540 } else {
e735f4d4 541 log_error("'%s' ressize %zu too short", cmd, ressize);
663996b3
MS		 542 }
543 }
544
545 /* log debug output only if we watch stderr */
546 if (fd_stderr >= 0) {
547 char *pos;
548 char *line;
549
550 pos = buf;
551 while ((line = strsep(&pos, "\n"))) {
552 if (pos != NULL || line[0] != '\0')
60f067b4 553 log_debug("'%s'(%s) '%s'", cmd, *fd == fd_stdout ? "out" : "err" , line);
663996b3
MS		 554 }
555 }
556 } else if (ev[i].events & EPOLLHUP) {
5eef597e
MP		 557 r = epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL);
558 if (r < 0) {
f47781d8 559 log_error_errno(errno, "failed to remove fd from epoll: %m");
5eef597e 560 return;
663996b3
MS		 561 }
562 *fd = -1;
563 }
564 }
565 }
566
567 /* return the child's stdout string */
568 if (result != NULL)
569 result[respos] = '\0';
663996b3
MS		 570}
571
86f210e9
MP		 572static int on_spawn_timeout(sd_event_source *s, uint64_t usec, void *userdata) {
573 Spawn *spawn = userdata;
574 char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
575
576 assert(spawn);
577
578 kill_and_sigcont(spawn->pid, SIGKILL);
579
580 log_error("spawned process '%s' ["PID_FMT"] timed out after %s, killing", spawn->cmd, spawn->pid,
581 format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
582
583 return 1;
584}
585
586static int on_spawn_timeout_warning(sd_event_source *s, uint64_t usec, void *userdata) {
587 Spawn *spawn = userdata;
588 char timeout[FORMAT_TIMESTAMP_RELATIVE_MAX];
589
590 assert(spawn);
591
592 log_warning("spawned process '%s' ["PID_FMT"] is taking longer than %s to complete", spawn->cmd, spawn->pid,
593 format_timestamp_relative(timeout, sizeof(timeout), spawn->timeout));
594
595 return 1;
596}
597
598static int on_spawn_sigchld(sd_event_source *s, const siginfo_t *si, void *userdata) {
599 Spawn *spawn = userdata;
600
601 assert(spawn);
602
603 switch (si->si_code) {
604 case CLD_EXITED:
605 if (si->si_status == 0) {
606 log_debug("Process '%s' succeeded.", spawn->cmd);
607 sd_event_exit(sd_event_source_get_event(s), 0);
608
609 return 1;
610 } else if (spawn->accept_failure)
611 log_debug("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
612 else
613 log_warning("Process '%s' failed with exit code %i.", spawn->cmd, si->si_status);
614
615 break;
616 case CLD_KILLED:
617 case CLD_DUMPED:
618 log_warning("Process '%s' terminated by signal %s.", spawn->cmd, signal_to_string(si->si_status));
619
620 break;
621 default:
622 log_error("Process '%s' failed due to unknown reason.", spawn->cmd);
623 }
624
625 sd_event_exit(sd_event_source_get_event(s), -EIO);
626
627 return 1;
628}
629
5eef597e
MP		 630static int spawn_wait(struct udev_event *event,
631 usec_t timeout_usec,
632 usec_t timeout_warn_usec,
86f210e9
MP		 633 const char *cmd, pid_t pid,
634 bool accept_failure) {
635 Spawn spawn = {
636 .cmd = cmd,
637 .pid = pid,
638 .accept_failure = accept_failure,
639 };
4c89c718 640 _cleanup_(sd_event_unrefp) sd_event *e = NULL;
86f210e9 641 int r, ret;
663996b3 642
86f210e9
MP		 643 r = sd_event_new(&e);
644 if (r < 0)
645 return r;
663996b3 646
86f210e9
MP		 647 if (timeout_usec > 0) {
648 usec_t usec, age_usec;
663996b3 649
86f210e9
MP		 650 usec = now(clock_boottime_or_monotonic());
651 age_usec = usec - event->birth_usec;
652 if (age_usec < timeout_usec) {
653 if (timeout_warn_usec > 0 && timeout_warn_usec < timeout_usec && age_usec < timeout_warn_usec) {
654 spawn.timeout_warn = timeout_warn_usec - age_usec;
5eef597e 655
86f210e9
MP		 656 r = sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
657 usec + spawn.timeout_warn, USEC_PER_SEC,
658 on_spawn_timeout_warning, &spawn);
659 if (r < 0)
660 return r;
5eef597e 661 }
663996b3 662
86f210e9 663 spawn.timeout = timeout_usec - age_usec;
5eef597e 664
86f210e9
MP		 665 r = sd_event_add_time(e, NULL, clock_boottime_or_monotonic(),
666 usec + spawn.timeout, USEC_PER_SEC, on_spawn_timeout, &spawn);
667 if (r < 0)
668 return r;
663996b3 669 }
86f210e9 670 }
663996b3 671
86f210e9
MP		 672 r = sd_event_add_child(e, NULL, pid, WEXITED, on_spawn_sigchld, &spawn);
673 if (r < 0)
674 return r;
663996b3 675
86f210e9
MP		 676 r = sd_event_loop(e);
677 if (r < 0)
678 return r;
663996b3 679
86f210e9
MP		 680 r = sd_event_get_exit_code(e, &ret);
681 if (r < 0)
682 return r;
683
684 return ret;
663996b3
MS		 685}
686
5eef597e 687int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[]) {
663996b3
MS		 688 int i = 0;
689 char *pos;
690
691 if (strchr(cmd, ' ') == NULL) {
692 argv[i++] = cmd;
693 goto out;
694 }
695
696 pos = cmd;
697 while (pos != NULL && pos[0] != '\0') {
698 if (pos[0] == '\'') {
699 /* do not separate quotes */
700 pos++;
701 argv[i] = strsep(&pos, "\'");
702 if (pos != NULL)
703 while (pos[0] == ' ')
704 pos++;
705 } else {
706 argv[i] = strsep(&pos, " ");
707 if (pos != NULL)
708 while (pos[0] == ' ')
709 pos++;
710 }
711 i++;
712 }
713out:
714 argv[i] = NULL;
715 if (argc)
716 *argc = i;
717 return 0;
718}
719
720int udev_event_spawn(struct udev_event *event,
5eef597e
MP		 721 usec_t timeout_usec,
722 usec_t timeout_warn_usec,
86f210e9 723 bool accept_failure,
fb183854 724 const char *cmd,
5eef597e 725 char *result, size_t ressize) {
663996b3
MS		 726 int outpipe[2] = {-1, -1};
727 int errpipe[2] = {-1, -1};
728 pid_t pid;
663996b3
MS		 729 int err = 0;
730
663996b3 731 /* pipes from child to parent */
f47781d8 732 if (result != NULL || log_get_max_level() >= LOG_INFO) {
663996b3 733 if (pipe2(outpipe, O_NONBLOCK) != 0) {
6300502b 734 err = log_error_errno(errno, "pipe failed: %m");
663996b3
MS		 735 goto out;
736 }
737 }
f47781d8 738 if (log_get_max_level() >= LOG_INFO) {
663996b3 739 if (pipe2(errpipe, O_NONBLOCK) != 0) {
6300502b 740 err = log_error_errno(errno, "pipe failed: %m");
663996b3
MS		 741 goto out;
742 }
743 }
744
663996b3
MS		 745 pid = fork();
746 switch(pid) {
747 case 0:
fb183854
MP		 748 {
749 char arg[UTIL_PATH_SIZE];
750 char *argv[128];
751 char program[UTIL_PATH_SIZE];
752
663996b3 753 /* child closes parent's ends of pipes */
6300502b
MP		 754 outpipe[READ_END] = safe_close(outpipe[READ_END]);
755 errpipe[READ_END] = safe_close(errpipe[READ_END]);
663996b3 756
fb183854
MP		 757 strscpy(arg, sizeof(arg), cmd);
758 udev_build_argv(event->udev, arg, NULL, argv);
759
760 /* allow programs in /usr/lib/udev/ to be called without the path */
761 if (argv[0][0] != '/') {
762 strscpyl(program, sizeof(program), UDEVLIBEXECDIR "/", argv[0], NULL);
763 argv[0] = program;
764 }
765
60f067b4 766 log_debug("starting '%s'", cmd);
663996b3 767
fb183854 768 spawn_exec(event, cmd, argv, udev_device_get_properties_envp(event->dev),
663996b3
MS		 769 outpipe[WRITE_END], errpipe[WRITE_END]);
770
fb183854
MP		 771 _exit(2);
772 }
663996b3 773 case -1:
f47781d8 774 log_error_errno(errno, "fork of '%s' failed: %m", cmd);
663996b3
MS		 775 err = -1;
776 goto out;
777 default:
778 /* parent closed child's ends of pipes */
6300502b
MP		 779 outpipe[WRITE_END] = safe_close(outpipe[WRITE_END]);
780 errpipe[WRITE_END] = safe_close(errpipe[WRITE_END]);
663996b3 781
5eef597e
MP		 782 spawn_read(event,
783 timeout_usec,
784 cmd,
785 outpipe[READ_END], errpipe[READ_END],
786 result, ressize);
663996b3 787
86f210e9 788 err = spawn_wait(event, timeout_usec, timeout_warn_usec, cmd, pid, accept_failure);
663996b3
MS		 789 }
790
791out:
792 if (outpipe[READ_END] >= 0)
793 close(outpipe[READ_END]);
794 if (outpipe[WRITE_END] >= 0)
795 close(outpipe[WRITE_END]);
796 if (errpipe[READ_END] >= 0)
797 close(errpipe[READ_END]);
798 if (errpipe[WRITE_END] >= 0)
799 close(errpipe[WRITE_END]);
800 return err;
801}
802
5eef597e 803static int rename_netif(struct udev_event *event) {
663996b3 804 struct udev_device *dev = event->dev;
60f067b4
JS		 805 char name[IFNAMSIZ];
806 const char *oldname;
807 int r;
663996b3 808
60f067b4 809 oldname = udev_device_get_sysname(dev);
663996b3 810
60f067b4
JS		 811 strscpy(name, IFNAMSIZ, event->name);
812
5eef597e 813 r = rtnl_set_link_name(&event->rtnl, udev_device_get_ifindex(dev), name);
f47781d8
MP		 814 if (r < 0)
815 return log_error_errno(r, "Error changing net interface name '%s' to '%s': %m", oldname, name);
60f067b4 816
f47781d8 817 log_debug("renamed network interface '%s' to '%s'", oldname, name);
60f067b4 818
5eef597e 819 return 0;
663996b3
MS		 820}
821
5eef597e 822void udev_event_execute_rules(struct udev_event *event,
f47781d8
MP		 823 usec_t timeout_usec, usec_t timeout_warn_usec,
824 struct udev_list *properties_list,
86f210e9 825 struct udev_rules *rules) {
663996b3 826 struct udev_device *dev = event->dev;
663996b3
MS		 827
828 if (udev_device_get_subsystem(dev) == NULL)
60f067b4 829 return;
663996b3
MS		 830
831 if (streq(udev_device_get_action(dev), "remove")) {
e3bff60a 832 udev_device_read_db(dev);
663996b3 833 udev_device_tag_index(dev, NULL, false);
e3bff60a 834 udev_device_delete_db(dev);
663996b3
MS		 835
836 if (major(udev_device_get_devnum(dev)) != 0)
837 udev_watch_end(event->udev, dev);
838
f47781d8
MP		 839 udev_rules_apply_to_event(rules, event,
840 timeout_usec, timeout_warn_usec,
86f210e9 841 properties_list);
663996b3
MS		 842
843 if (major(udev_device_get_devnum(dev)) != 0)
844 udev_node_remove(dev);
845 } else {
e3bff60a 846 event->dev_db = udev_device_clone_with_db(dev);
663996b3 847 if (event->dev_db != NULL) {
663996b3
MS		 848 /* disable watch during event processing */
849 if (major(udev_device_get_devnum(dev)) != 0)
850 udev_watch_end(event->udev, event->dev_db);
663996b3 851
4c89c718
MP		 852 if (major(udev_device_get_devnum(dev)) == 0 &&
853 streq(udev_device_get_action(dev), "move"))
854 udev_device_copy_properties(dev, event->dev_db);
855 }
5eef597e 856
f47781d8
MP		 857 udev_rules_apply_to_event(rules, event,
858 timeout_usec, timeout_warn_usec,
86f210e9 859 properties_list);
663996b3
MS		 860
861 /* rename a new network interface, if needed */
862 if (udev_device_get_ifindex(dev) > 0 && streq(udev_device_get_action(dev), "add") &&
863 event->name != NULL && !streq(event->name, udev_device_get_sysname(dev))) {
60f067b4 864 int r;
663996b3 865
60f067b4 866 r = rename_netif(event);
e735f4d4
MP		 867 if (r < 0)
868 log_warning_errno(r, "could not rename interface '%d' from '%s' to '%s': %m", udev_device_get_ifindex(dev),
869 udev_device_get_sysname(dev), event->name);
870 else {
e735f4d4
MP		 871 r = udev_device_rename(dev, event->name);
872 if (r < 0)
873 log_warning_errno(r, "renamed interface '%d' from '%s' to '%s', but could not update udev_device: %m",
874 udev_device_get_ifindex(dev), udev_device_get_sysname(dev), event->name);
e3bff60a 875 else
60f067b4 876 log_debug("changed devpath to '%s'", udev_device_get_devpath(dev));
663996b3
MS		 877 }
878 }
879
880 if (major(udev_device_get_devnum(dev)) > 0) {
881 bool apply;
882
883 /* remove/update possible left-over symlinks from old database entry */
884 if (event->dev_db != NULL)
885 udev_node_update_old_links(dev, event->dev_db);
886
887 if (!event->owner_set)
888 event->uid = udev_device_get_devnode_uid(dev);
889
890 if (!event->group_set)
891 event->gid = udev_device_get_devnode_gid(dev);
892
893 if (!event->mode_set) {
894 if (udev_device_get_devnode_mode(dev) > 0) {
895 /* kernel supplied value */
896 event->mode = udev_device_get_devnode_mode(dev);
897 } else if (event->gid > 0) {
898 /* default 0660 if a group is assigned */
899 event->mode = 0660;
900 } else {
901 /* default 0600 */
902 event->mode = 0600;
903 }
904 }
905
906 apply = streq(udev_device_get_action(dev), "add") || event->owner_set || event->group_set || event->mode_set;
60f067b4 907 udev_node_add(dev, apply, event->mode, event->uid, event->gid, &event->seclabel_list);
663996b3
MS		 908 }
909
910 /* preserve old, or get new initialization timestamp */
e3bff60a 911 udev_device_ensure_usec_initialized(event->dev, event->dev_db);
663996b3
MS		 912
913 /* (re)write database file */
663996b3 914 udev_device_tag_index(dev, event->dev_db, true);
e3bff60a 915 udev_device_update_db(dev);
663996b3
MS		 916 udev_device_set_is_initialized(dev);
917
e3bff60a 918 event->dev_db = udev_device_unref(event->dev_db);
663996b3 919 }
663996b3
MS		 920}
921
86f210e9 922void udev_event_execute_run(struct udev_event *event, usec_t timeout_usec, usec_t timeout_warn_usec) {
663996b3
MS		 923 struct udev_list_entry *list_entry;
924
925 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
fb183854 926 char command[UTIL_PATH_SIZE];
663996b3
MS		 927 const char *cmd = udev_list_entry_get_name(list_entry);
928 enum udev_builtin_cmd builtin_cmd = udev_list_entry_get_num(list_entry);
929
fb183854 930 udev_event_apply_format(event, cmd, command, sizeof(command));
663996b3 931
fb183854 932 if (builtin_cmd < UDEV_BUILTIN_MAX)
663996b3 933 udev_builtin_run(event->dev, builtin_cmd, command, false);
fb183854 934 else {
663996b3 935 if (event->exec_delay > 0) {
fb183854 936 log_debug("delay execution of '%s'", command);
663996b3
MS		 937 sleep(event->exec_delay);
938 }
939
fb183854 940 udev_event_spawn(event, timeout_usec, timeout_warn_usec, false, command, NULL, 0);
663996b3
MS		 941 }
942 }
943}
systemd for Proxmox projects