2 * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
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.
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.
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/>.
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <linux/sockios.h>
34 struct udev_event *udev_event_new(struct udev_device *dev)
36 struct udev_event *event;
38 event = calloc(1, sizeof(struct udev_event));
42 event->udev = udev_device_get_udev(dev);
43 udev_list_init(&event->run_list);
44 dbg(event->udev, "allocated event %p\n", event);
48 void udev_event_unref(struct udev_event *event)
52 udev_list_cleanup_entries(event->udev, &event->run_list);
53 free(event->tmp_node);
54 free(event->program_result);
56 dbg(event->udev, "free event %p\n", event);
60 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
62 struct udev_device *dev = event->dev;
82 static const struct subst_map {
87 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
88 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
89 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
90 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
91 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
92 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
93 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
94 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
95 { .name = "id", .fmt = 'b', .type = SUBST_ID },
96 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
97 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
98 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
99 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
100 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
101 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
102 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
103 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
114 enum subst_type type = SUBST_UNKNOWN;
115 char attrbuf[UTIL_PATH_SIZE];
118 while (from[0] != '\0') {
119 if (from[0] == '$') {
120 /* substitute named variable */
123 if (from[1] == '$') {
128 for (i = 0; i < ARRAY_SIZE(map); i++) {
129 if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
131 from += strlen(map[i].name)+1;
132 dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
136 } else if (from[0] == '%') {
137 /* substitute format char */
140 if (from[1] == '%') {
145 for (i = 0; i < ARRAY_SIZE(map); i++) {
146 if (from[1] == map[i].fmt) {
149 dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
166 /* extract possible $format{attr} */
167 if (from[0] == '{') {
171 for (i = 0; from[i] != '}'; i++) {
172 if (from[i] == '\0') {
173 err(event->udev, "missing closing brace for format '%s'\n", src);
177 if (i >= sizeof(attrbuf))
179 memcpy(attrbuf, from, i);
189 l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
190 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
193 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
194 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
196 case SUBST_KERNEL_NUMBER:
197 if (udev_device_get_sysnum(dev) == NULL)
199 l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
200 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
203 if (event->dev_parent == NULL)
205 l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
206 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
211 if (event->dev_parent == NULL)
214 driver = udev_device_get_driver(event->dev_parent);
217 l = util_strpcpy(&s, l, driver);
218 dbg(event->udev, "substitute driver '%s'\n", driver);
222 char num[UTIL_PATH_SIZE];
224 sprintf(num, "%d", major(udev_device_get_devnum(dev)));
225 l = util_strpcpy(&s, l, num);
226 dbg(event->udev, "substitute major number '%s'\n", num);
230 char num[UTIL_PATH_SIZE];
232 sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
233 l = util_strpcpy(&s, l, num);
234 dbg(event->udev, "substitute minor number '%s'\n", num);
241 if (event->program_result == NULL)
243 /* get part part of the result string */
246 i = strtoul(attr, &rest, 10);
248 char result[UTIL_PATH_SIZE];
249 char tmp[UTIL_PATH_SIZE];
252 dbg(event->udev, "request part #%d of result string\n", i);
253 util_strscpy(result, sizeof(result), event->program_result);
256 while (cpos[0] != '\0' && !isspace(cpos[0]))
258 while (isspace(cpos[0]))
262 err(event->udev, "requested part of result string not found\n");
265 util_strscpy(tmp, sizeof(tmp), cpos);
266 /* %{2+}c copies the whole string from the second part on */
267 if (rest[0] != '+') {
268 cpos = strchr(tmp, ' ');
272 l = util_strpcpy(&s, l, tmp);
273 dbg(event->udev, "substitute part of result string '%s'\n", tmp);
275 l = util_strpcpy(&s, l, event->program_result);
276 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
281 const char *value = NULL;
282 char vbuf[UTIL_NAME_SIZE];
287 err(event->udev, "missing file parameter for attr\n");
291 /* try to read the value specified by "[dmi/id]product_name" */
292 if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
295 /* try to read the attribute the device */
297 value = udev_device_get_sysattr_value(event->dev, attr);
299 /* try to read the attribute of the parent device, other matches have selected */
300 if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
301 value = udev_device_get_sysattr_value(event->dev_parent, attr);
306 /* strip trailing whitespace, and replace unwanted characters */
308 util_strscpy(vbuf, sizeof(vbuf), value);
310 while (len > 0 && isspace(vbuf[--len]))
312 count = udev_util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
314 info(event->udev, "%i character(s) replaced\n" , count);
315 l = util_strpcpy(&s, l, vbuf);
316 dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
320 struct udev_device *dev_parent;
323 dev_parent = udev_device_get_parent(event->dev);
324 if (dev_parent == NULL)
326 devnode = udev_device_get_devnode(dev_parent);
327 if (devnode != NULL) {
328 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
330 l = util_strpcpy(&s, l, &devnode[devlen]);
331 dbg(event->udev, "found parent '%s', got node name '%s'\n",
332 udev_device_get_syspath(dev_parent), &devnode[devlen]);
336 case SUBST_TEMP_NODE: {
339 char filename[UTIL_PATH_SIZE];
342 if (event->tmp_node != NULL) {
343 l = util_strpcpy(&s, l, event->tmp_node);
344 dbg(event->udev, "tempnode: return earlier created one\n");
347 devnum = udev_device_get_devnum(dev);
348 if (major(devnum) == 0)
350 /* lookup kernel provided node */
351 if (udev_device_get_knodename(dev) != NULL) {
352 util_strscpyl(filename, sizeof(filename),
353 udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
354 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
355 l = util_strpcpy(&s, l, filename);
356 dbg(event->udev, "tempnode: return kernel node\n");
360 /* lookup /dev/{char,block}/<maj>:<min> */
361 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
365 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
366 udev_get_dev_path(event->udev), devtype,
367 major(udev_device_get_devnum(dev)),
368 minor(udev_device_get_devnum(dev)));
369 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
370 l = util_strpcpy(&s, l, filename);
371 dbg(event->udev, "tempnode: return maj:min node\n");
374 /* create temporary node */
375 dbg(event->udev, "tempnode: create temp node\n");
376 asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
377 udev_get_dev_path(event->udev), devtype,
378 major(udev_device_get_devnum(dev)),
379 minor(udev_device_get_devnum(dev)));
380 if (event->tmp_node == NULL)
382 udev_node_mknod(dev, event->tmp_node, 0600, 0, 0);
383 l = util_strpcpy(&s, l, event->tmp_node);
387 if (event->name != NULL) {
388 l = util_strpcpy(&s, l, event->name);
389 dbg(event->udev, "substitute name '%s'\n", event->name);
391 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
392 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
396 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
397 struct udev_list_entry *list_entry;
399 list_entry = udev_device_get_devlinks_list_entry(dev);
400 if (list_entry == NULL)
402 l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
403 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
404 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
408 l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
409 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
412 l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
413 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
417 dbg(event->udev, "missing attribute\n");
422 value = udev_device_get_property_value(event->dev, attr);
425 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
426 l = util_strpcpy(&s, l, value);
430 err(event->udev, "unknown substitution type=%i\n", type);
437 dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
441 static void rename_netif_kernel_log(struct ifreq ifr)
446 klog = open("/dev/kmsg", O_WRONLY);
450 f = fdopen(klog, "w");
456 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
457 ifr.ifr_name, ifr.ifr_newname);
461 static int rename_netif(struct udev_event *event)
463 struct udev_device *dev = event->dev;
468 info(event->udev, "changing net interface name from '%s' to '%s'\n",
469 udev_device_get_sysname(dev), event->name);
471 sk = socket(PF_INET, SOCK_DGRAM, 0);
473 err(event->udev, "error opening socket: %m\n");
477 memset(&ifr, 0x00, sizeof(struct ifreq));
478 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
479 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
480 err = ioctl(sk, SIOCSIFNAME, &ifr);
482 rename_netif_kernel_log(ifr);
486 /* see if the destination interface name already exists */
487 if (errno != EEXIST) {
488 err(event->udev, "error changing netif name %s to %s: %m\n",
489 ifr.ifr_name, ifr.ifr_newname);
493 /* free our own name, another process may wait for us */
494 util_strscpyl(ifr.ifr_newname, IFNAMSIZ, udev_device_get_sysname(dev), "_rename", NULL);
495 err = ioctl(sk, SIOCSIFNAME, &ifr);
497 err(event->udev, "error changing netif name %s to %s: %m\n",
498 ifr.ifr_name, ifr.ifr_newname);
502 /* wait 90 seconds for our target to become available */
503 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
504 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
507 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
509 err = ioctl(sk, SIOCSIFNAME, &ifr);
511 rename_netif_kernel_log(ifr);
515 if (errno != EEXIST) {
516 err(event->udev, "error changing net interface name %s to %s: %m\n",
517 ifr.ifr_name, ifr.ifr_newname);
520 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
521 event->name, (90 * 20) - loop);
522 nanosleep(&duration, NULL);
530 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
532 struct udev_device *dev = event->dev;
535 if (udev_device_get_sysname_old(dev) != NULL &&
536 strcmp(udev_device_get_sysname_old(dev), udev_device_get_sysname(dev)) != 0) {
537 udev_device_rename_db(dev);
538 info(event->udev, "moved database from '%s:%s' to '%s:%s'\n",
539 udev_device_get_subsystem(dev), udev_device_get_sysname_old(dev),
540 udev_device_get_subsystem(dev), udev_device_get_sysname(dev));
543 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
544 udev_device_read_db(dev);
545 udev_device_delete_db(dev);
546 udev_device_tag_index(dev, NULL, false);
548 if (major(udev_device_get_devnum(dev)) != 0)
549 udev_watch_end(event->udev, dev);
551 udev_rules_apply_to_event(rules, event);
553 if (major(udev_device_get_devnum(dev)) != 0)
554 err = udev_node_remove(dev);
556 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
557 if (event->dev_db != NULL) {
558 udev_device_read_db(event->dev_db);
559 udev_device_set_info_loaded(event->dev_db);
561 /* disable watch during event processing */
562 if (major(udev_device_get_devnum(dev)) != 0)
563 udev_watch_end(event->udev, event->dev_db);
566 udev_rules_apply_to_event(rules, event);
568 /* rename a new network interface, if needed */
569 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
570 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
571 char syspath[UTIL_PATH_SIZE];
574 err = rename_netif(event);
576 info(event->udev, "renamed netif to '%s'\n", event->name);
578 /* delete stale db file */
579 udev_device_delete_db(dev);
580 udev_device_tag_index(dev, NULL, false);
582 /* remember old name */
583 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
585 /* now change the devpath, because the kernel device name has changed */
586 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
587 pos = strrchr(syspath, '/');
590 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
591 udev_device_set_syspath(event->dev, syspath);
592 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
593 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
598 if (major(udev_device_get_devnum(dev)) != 0) {
599 char filename[UTIL_PATH_SIZE];
601 if (event->tmp_node != NULL) {
602 info(event->udev, "cleanup temporary device node\n");
603 util_unlink_secure(event->udev, event->tmp_node);
604 free(event->tmp_node);
605 event->tmp_node = NULL;
608 /* no rule, use kernel provided name */
609 if (event->name == NULL) {
610 if (udev_device_get_knodename(dev) != NULL) {
611 event->name = strdup(udev_device_get_knodename(dev));
612 info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
614 event->name = strdup(udev_device_get_sysname(event->dev));
615 info(event->udev, "no node name set, will use device name '%s'\n", event->name);
619 if (event->name == NULL || event->name[0] == '\0') {
620 udev_device_delete_db(dev);
621 udev_device_tag_index(dev, NULL, false);
622 udev_device_unref(event->dev_db);
624 err(event->udev, "no node name, something went wrong, ignoring\n");
628 if (udev_device_get_knodename(dev) != NULL && strcmp(udev_device_get_knodename(dev), event->name) != 0)
629 err(event->udev, "kernel-provided name '%s' and NAME= '%s' disagree, "
630 "please use SYMLINK+= or change the kernel to provide the proper name\n",
631 udev_device_get_knodename(dev), event->name);
633 /* set device node name */
634 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
635 udev_device_set_devnode(dev, filename);
638 udev_device_update_db(dev);
639 udev_device_tag_index(dev, event->dev_db, true);
641 if (major(udev_device_get_devnum(dev)) != 0) {
642 /* remove/update possible left-over symlinks from old database entry */
643 if (event->dev_db != NULL)
644 udev_node_update_old_links(dev, event->dev_db);
646 if (event->mode == 0) {
652 err = udev_node_add(dev, event->mode, event->uid, event->gid);
655 udev_device_unref(event->dev_db);
656 event->dev_db = NULL;
662 int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
664 struct udev_list_entry *list_entry;
667 dbg(event->udev, "executing run list\n");
668 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
669 const char *cmd = udev_list_entry_get_name(list_entry);
671 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
672 struct udev_monitor *monitor;
674 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
677 udev_monitor_send_device(monitor, NULL, event->dev);
678 udev_monitor_unref(monitor);
680 char program[UTIL_PATH_SIZE];
683 udev_event_apply_format(event, cmd, program, sizeof(program));
684 envp = udev_device_get_properties_envp(event->dev);
685 if (util_run_program(event->udev, program, envp, NULL, 0, NULL, sigmask, true) != 0) {
686 if (udev_list_entry_get_flags(list_entry))