2 * Copyright (C) 2004-2008 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/>.
26 #include <sys/ioctl.h>
27 #include <sys/socket.h>
29 #include <linux/sockios.h>
33 struct udev_event *udev_event_new(struct udev_device *dev)
35 struct udev_event *event;
37 event = calloc(1, sizeof(struct udev_event));
41 event->udev = udev_device_get_udev(dev);
42 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 /* extract possible {attr} and move str behind it */
61 static char *get_format_attribute(struct udev *udev, char **str)
67 pos = strchr(*str, '}');
69 err(udev, "missing closing brace for format\n");
75 dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
80 void udev_event_apply_format(struct udev_event *event, char *string, size_t maxsize)
82 struct udev_device *dev = event->dev;
83 char temp[UTIL_PATH_SIZE];
84 char temp2[UTIL_PATH_SIZE];
85 char *head, *tail, *cpos, *attr, *rest;
107 static const struct subst_map {
110 enum subst_type type;
112 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
113 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
114 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
115 { .name = "id", .fmt = 'b', .type = SUBST_ID },
116 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
117 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
118 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
119 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
120 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
121 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
122 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
123 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
124 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
125 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
126 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
127 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
128 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
131 enum subst_type type;
132 const struct subst_map *subst;
136 while (head[0] != '\0') {
137 if (head[0] == '$') {
138 /* substitute named variable */
141 if (head[1] == '$') {
142 util_strlcpy(temp, head+2, sizeof(temp));
143 util_strlcpy(head+1, temp, maxsize);
148 for (subst = map; subst->name; subst++) {
149 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
151 tail = head + strlen(subst->name)+1;
152 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
157 err(event->udev, "unknown format variable '%s'\n", head);
158 } else if (head[0] == '%') {
159 /* substitute format char */
162 if (head[1] == '%') {
163 util_strlcpy(temp, head+2, sizeof(temp));
164 util_strlcpy(head+1, temp, maxsize);
170 for (subst = map; subst->name; subst++) {
171 if (tail[0] == subst->fmt) {
174 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
179 err(event->udev, "unknown format char '%c'\n", tail[0]);
185 attr = get_format_attribute(event->udev, &tail);
186 util_strlcpy(temp, tail, sizeof(temp));
187 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
191 util_strlcat(string, udev_device_get_devpath(dev), maxsize);
192 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
195 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
196 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
198 case SUBST_KERNEL_NUMBER:
199 if (udev_device_get_sysnum(dev) == NULL)
201 util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
202 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
205 if (event->dev_parent != NULL) {
206 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
207 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 util_strlcat(string, driver, maxsize);
218 dbg(event->udev, "substitute driver '%s'\n", driver);
222 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
223 util_strlcat(string, temp2, maxsize);
224 dbg(event->udev, "substitute major number '%s'\n", temp2);
227 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
228 util_strlcat(string, temp2, maxsize);
229 dbg(event->udev, "substitute minor number '%s'\n", temp2);
232 if (event->program_result == NULL)
234 /* get part part of the result string */
237 i = strtoul(attr, &rest, 10);
239 char result[UTIL_PATH_SIZE];
241 dbg(event->udev, "request part #%d of result string\n", i);
242 util_strlcpy(result, event->program_result, sizeof(result));
245 while (cpos[0] != '\0' && !isspace(cpos[0]))
247 while (isspace(cpos[0]))
251 err(event->udev, "requested part of result string not found\n");
254 util_strlcpy(temp2, cpos, sizeof(temp2));
255 /* %{2+}c copies the whole string from the second part on */
256 if (rest[0] != '+') {
257 cpos = strchr(temp2, ' ');
261 util_strlcat(string, temp2, maxsize);
262 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
264 util_strlcat(string, event->program_result, maxsize);
265 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
270 err(event->udev, "missing file parameter for attr\n");
273 char value[UTIL_NAME_SIZE];
277 /* read the value specified by [usb/]*/
278 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
280 /* try to read attribute of the current device */
281 if (value[0] == '\0') {
282 val = udev_device_get_sysattr_value(event->dev, attr);
284 util_strlcpy(value, val, sizeof(value));
287 /* try to read the attribute of the parent device, other matches have selected */
288 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
289 val = udev_device_get_sysattr_value(event->dev_parent, attr);
291 util_strlcpy(value, val, sizeof(value));
297 /* strip trailing whitespace, and replace unwanted characters */
298 size = strlen(value);
299 while (size > 0 && isspace(value[--size]))
301 count = udev_util_replace_chars(value, UDEV_ALLOWED_CHARS_INPUT);
303 info(event->udev, "%i character(s) replaced\n" , count);
304 util_strlcat(string, value, maxsize);
305 dbg(event->udev, "substitute sysfs value '%s'\n", value);
310 struct udev_device *dev_parent;
313 dev_parent = udev_device_get_parent(event->dev);
314 if (dev_parent == NULL)
316 devnode = udev_device_get_devnode(dev_parent);
317 if (devnode != NULL) {
318 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
320 util_strlcat(string, &devnode[devlen], maxsize);
321 dbg(event->udev, "found parent '%s', got node name '%s'\n",
322 udev_device_get_syspath(dev_parent), &devnode[devlen]);
326 case SUBST_TEMP_NODE:
330 char filename[UTIL_PATH_SIZE];
333 if (event->tmp_node != NULL) {
334 util_strlcat(string, event->tmp_node, maxsize);
335 dbg(event->udev, "tempnode: return earlier created one\n");
338 devnum = udev_device_get_devnum(dev);
339 if (major(devnum) == 0)
341 /* lookup kernel provided node */
342 if (udev_device_get_knodename(dev) != NULL) {
343 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
344 util_strlcat(filename, "/", sizeof(filename));
345 util_strlcat(filename, udev_device_get_knodename(dev), sizeof(filename));
346 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
347 util_strlcat(string, filename, maxsize);
348 dbg(event->udev, "tempnode: return kernel node\n");
352 /* lookup /dev/{char,block}/<maj>:<min> */
353 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
357 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
358 udev_get_dev_path(event->udev), devtype,
359 major(udev_device_get_devnum(dev)),
360 minor(udev_device_get_devnum(dev)));
361 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
362 util_strlcat(string, filename, maxsize);
363 dbg(event->udev, "tempnode: return maj:min node\n");
366 /* create temporary node */
367 dbg(event->udev, "tempnode: create temp node\n");
368 asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
369 udev_get_dev_path(event->udev), devtype,
370 major(udev_device_get_devnum(dev)),
371 minor(udev_device_get_devnum(dev)));
372 if (event->tmp_node == NULL)
374 udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
375 util_strlcat(string, event->tmp_node, maxsize);
379 if (event->name != NULL) {
380 util_strlcat(string, event->name, maxsize);
381 dbg(event->udev, "substitute name '%s'\n", event->name);
383 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
384 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
389 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
390 struct udev_list_entry *list_entry;
392 list_entry = udev_device_get_devlinks_list_entry(dev);
393 if (list_entry == NULL)
395 util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
396 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
397 util_strlcat(string, " ", maxsize);
398 util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
403 util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
404 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
407 util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
408 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
412 dbg(event->udev, "missing attribute\n");
417 value = udev_device_get_property_value(event->dev, attr);
420 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
421 util_strlcat(string, value, maxsize);
425 err(event->udev, "unknown substitution type=%i\n", type);
428 util_strlcat(string, temp, maxsize);
432 static void rename_netif_kernel_log(struct ifreq ifr)
437 klog = open("/dev/kmsg", O_WRONLY);
441 f = fdopen(klog, "w");
447 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
448 ifr.ifr_name, ifr.ifr_newname);
452 static int rename_netif(struct udev_event *event)
454 struct udev_device *dev = event->dev;
459 info(event->udev, "changing net interface name from '%s' to '%s'\n",
460 udev_device_get_sysname(dev), event->name);
462 sk = socket(PF_INET, SOCK_DGRAM, 0);
464 err(event->udev, "error opening socket: %m\n");
468 memset(&ifr, 0x00, sizeof(struct ifreq));
469 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
470 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
471 err = ioctl(sk, SIOCSIFNAME, &ifr);
473 rename_netif_kernel_log(ifr);
477 /* see if the destination interface name already exists */
478 if (errno != EEXIST) {
479 err(event->udev, "error changing netif name %s to %s: %m\n",
480 ifr.ifr_name, ifr.ifr_newname);
484 /* free our own name, another process may wait for us */
485 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
486 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
487 err = ioctl(sk, SIOCSIFNAME, &ifr);
489 err(event->udev, "error changing netif name %s to %s: %m\n",
490 ifr.ifr_name, ifr.ifr_newname);
494 /* wait 90 seconds for our target to become available */
495 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
496 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
499 err = ioctl(sk, SIOCSIFNAME, &ifr);
501 rename_netif_kernel_log(ifr);
505 if (errno != EEXIST) {
506 err(event->udev, "error changing net interface name %s to %s: %m\n",
507 ifr.ifr_name, ifr.ifr_newname);
510 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
511 event->name, (90 * 20) - loop);
512 usleep(1000 * 1000 / 20);
520 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
522 struct udev_device *dev = event->dev;
525 if (udev_device_get_devpath_old(dev) != NULL) {
526 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
527 info(event->udev, "moved database from '%s' to '%s'\n",
528 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
531 /* add device node */
532 if (major(udev_device_get_devnum(dev)) != 0 &&
533 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
534 char filename[UTIL_PATH_SIZE];
535 struct udev_device *dev_old;
536 int delete_kdevnode = 0;
538 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
540 /* read old database entry */
541 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
542 if (dev_old != NULL) {
543 udev_device_read_db(dev_old);
544 udev_device_set_info_loaded(dev_old);
546 /* disable watch during event processing */
547 udev_watch_end(event->udev, dev_old);
550 udev_rules_apply_to_event(rules, event);
551 if (event->tmp_node != NULL) {
552 dbg(event->udev, "cleanup temporary device node\n");
553 util_unlink_secure(event->udev, event->tmp_node);
554 free(event->tmp_node);
555 event->tmp_node = NULL;
558 if (event->ignore_device) {
559 info(event->udev, "device event will be ignored\n");
564 if (event->name != NULL && event->name[0] == '\0') {
565 info(event->udev, "device node creation supressed\n");
570 /* if rule given name disagrees with kernel node name, delete kernel node */
571 if (event->name != NULL && udev_device_get_knodename(dev) != NULL) {
572 if (strcmp(event->name, udev_device_get_knodename(dev)) != 0)
576 /* no rule, use kernel provided name */
577 if (event->name == NULL) {
578 if (udev_device_get_knodename(dev) != NULL) {
579 event->name = strdup(udev_device_get_knodename(dev));
580 info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
582 event->name = strdup(udev_device_get_sysname(event->dev));
583 info(event->udev, "no node name set, will use device name '%s'\n", event->name);
587 /* something went wrong */
588 if (event->name == NULL) {
589 err(event->udev, "no node name for '%s'\n", udev_device_get_sysname(event->dev));
593 /* set device node name */
594 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
595 util_strlcat(filename, "/", sizeof(filename));
596 util_strlcat(filename, event->name, sizeof(filename));
597 udev_device_set_devnode(dev, filename);
599 /* write current database entry */
600 udev_device_update_db(dev);
602 /* remove/update possible left-over symlinks from old database entry */
604 udev_node_update_old_links(dev, dev_old);
606 /* create new node and symlinks */
607 err = udev_node_add(dev, event->mode, event->uid, event->gid);
609 if (delete_kdevnode && udev_device_get_knodename(dev) != NULL) {
612 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
613 util_strlcat(filename, "/", sizeof(filename));
614 util_strlcat(filename, udev_device_get_knodename(dev), sizeof(filename));
615 if (stat(filename, &stats) == 0 && stats.st_rdev == udev_device_get_devnum(dev)) {
617 util_delete_path(event->udev, filename);
618 info(event->udev, "removed kernel created node '%s'\n", filename);
621 udev_device_unref(dev_old);
626 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
627 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
628 udev_device_delete_db(dev);
630 udev_rules_apply_to_event(rules, event);
631 if (event->ignore_device) {
632 info(event->udev, "device event will be ignored\n");
635 if (event->name == NULL)
638 /* look if we want to change the name of the netif */
639 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
640 char syspath[UTIL_PATH_SIZE];
643 err = rename_netif(event);
646 info(event->udev, "renamed netif to '%s'\n", event->name);
648 /* remember old name */
649 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
651 /* now change the devpath, because the kernel device name has changed */
652 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
653 pos = strrchr(syspath, '/');
656 util_strlcat(syspath, event->name, sizeof(syspath));
657 udev_device_set_syspath(event->dev, syspath);
658 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
659 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
662 udev_device_update_db(dev);
666 /* remove device node */
667 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
668 /* import database entry and delete it */
669 udev_device_read_db(dev);
670 udev_device_set_info_loaded(dev);
671 udev_device_delete_db(dev);
674 udev_watch_end(event->udev, dev);
676 if (udev_device_get_devnode(dev) == NULL) {
677 char devnode[UTIL_PATH_SIZE];
679 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
680 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
681 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
682 util_strlcat(devnode, "/", sizeof(devnode));
683 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
684 udev_device_set_devnode(dev, devnode);
687 udev_rules_apply_to_event(rules, event);
688 if (event->ignore_device) {
689 info(event->udev, "device event will be ignored\n");
693 if (udev_device_get_ignore_remove(dev)) {
694 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
698 err = udev_node_remove(dev);
702 /* default devices */
703 udev_rules_apply_to_event(rules, event);
704 if (event->ignore_device)
705 info(event->udev, "device event will be ignored\n");
707 if (strcmp(udev_device_get_action(dev), "remove") != 0)
708 udev_device_update_db(dev);
710 udev_device_delete_db(dev);
715 int udev_event_execute_run(struct udev_event *event)
717 struct udev_list_entry *list_entry;
720 dbg(event->udev, "executing run list\n");
721 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
722 const char *cmd = udev_list_entry_get_name(list_entry);
724 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
725 struct udev_monitor *monitor;
727 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
730 udev_monitor_send_device(monitor, event->dev);
731 udev_monitor_unref(monitor);
733 char program[UTIL_PATH_SIZE];
736 util_strlcpy(program, cmd, sizeof(program));
737 udev_event_apply_format(event, program, sizeof(program));
739 fprintf(stderr, "run %s (%llu) '%s'\n",
740 udev_device_get_syspath(event->dev),
741 udev_device_get_seqnum(event->dev),
743 envp = udev_device_get_properties_envp(event->dev);
744 if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
745 if (!udev_list_entry_get_flag(list_entry))