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 = malloc(sizeof(struct udev_event));
40 memset(event, 0x00, sizeof(struct udev_event));
43 event->udev = udev_device_get_udev(dev);
44 udev_list_init(&event->run_list);
46 util_strlcpy(event->owner, "0", sizeof(event->owner));
47 util_strlcpy(event->group, "0", sizeof(event->group));
49 dbg(event->udev, "allocated event %p\n", event);
53 void udev_event_unref(struct udev_event *event)
55 udev_list_cleanup(event->udev, &event->run_list);
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 /* extract possible format length and move str behind it*/
81 static int get_format_len(struct udev *udev, char **str)
86 if (isdigit(*str[0])) {
87 num = (int) strtoul(*str, &tail, 10);
90 dbg(udev, "format length=%i\n", num);
93 err(udev, "format parsing error '%s'\n", *str);
99 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
100 int udev_event_apply_subsys_kernel(struct udev_event *udev_event, const char *string,
101 char *result, size_t maxsize, int read_value)
103 char temp[UTIL_PATH_SIZE];
107 struct udev_device *dev;
111 if (string[0] != '[')
114 util_strlcpy(temp, string, sizeof(temp));
118 sysname = strchr(subsys, '/');
122 sysname = &sysname[1];
124 attr = strchr(sysname, ']');
134 if (read_value && attr == NULL)
137 dev = udev_device_new_from_subsystem_sysname(udev_event->udev, subsys, sysname);
144 val = udev_device_get_attr_value(dev, attr);
146 util_strlcpy(result, val, maxsize);
149 info(udev_event->udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
151 util_strlcpy(result, udev_device_get_syspath(dev), maxsize);
153 util_strlcat(result, "/", maxsize);
154 util_strlcat(result, attr, maxsize);
156 info(udev_event->udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
158 udev_device_unref(dev);
162 void udev_event_apply_format(struct udev_event *event, char *string, size_t maxsize)
164 struct udev_device *dev = event->dev;
165 char temp[UTIL_PATH_SIZE];
166 char temp2[UTIL_PATH_SIZE];
167 char *head, *tail, *cpos, *attr, *rest;
190 static const struct subst_map {
193 enum subst_type type;
195 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
196 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
197 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
198 { .name = "id", .fmt = 'b', .type = SUBST_ID },
199 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
200 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
201 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
202 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
203 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
204 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
205 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
206 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
207 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
208 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
209 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
210 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
211 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
214 enum subst_type type;
215 const struct subst_map *subst;
220 while (head[0] != '\0') {
221 if (head[0] == '$') {
222 /* substitute named variable */
225 if (head[1] == '$') {
226 util_strlcpy(temp, head+2, sizeof(temp));
227 util_strlcpy(head+1, temp, maxsize);
232 for (subst = map; subst->name; subst++) {
233 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
235 tail = head + strlen(subst->name)+1;
236 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
241 err(event->udev, "unknown format variable '%s'\n", head);
242 } else if (head[0] == '%') {
243 /* substitute format char */
246 if (head[1] == '%') {
247 util_strlcpy(temp, head+2, sizeof(temp));
248 util_strlcpy(head+1, temp, maxsize);
254 len = get_format_len(event->udev, &tail);
255 for (subst = map; subst->name; subst++) {
256 if (tail[0] == subst->fmt) {
259 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
264 err(event->udev, "unknown format char '%c'\n", tail[0]);
270 attr = get_format_attribute(event->udev, &tail);
271 util_strlcpy(temp, tail, sizeof(temp));
272 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
276 util_strlcat(string, udev_device_get_devpath(dev), maxsize);
277 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
280 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
281 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
283 case SUBST_KERNEL_NUMBER:
284 if (udev_device_get_sysnum(dev) == NULL)
286 util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
287 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
290 if (event->dev_parent != NULL) {
291 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
292 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
296 if (event->dev_parent != NULL) {
297 const char *driver = udev_device_get_driver(event->dev_parent);
301 util_strlcat(string, driver, maxsize);
302 dbg(event->udev, "substitute driver '%s'\n", driver);
306 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
307 util_strlcat(string, temp2, maxsize);
308 dbg(event->udev, "substitute major number '%s'\n", temp2);
311 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
312 util_strlcat(string, temp2, maxsize);
313 dbg(event->udev, "substitute minor number '%s'\n", temp2);
316 if (event->program_result[0] == '\0')
318 /* get part part of the result string */
321 i = strtoul(attr, &rest, 10);
323 dbg(event->udev, "request part #%d of result string\n", i);
324 cpos = event->program_result;
326 while (cpos[0] != '\0' && !isspace(cpos[0]))
328 while (isspace(cpos[0]))
332 err(event->udev, "requested part of result string not found\n");
335 util_strlcpy(temp2, cpos, sizeof(temp2));
336 /* %{2+}c copies the whole string from the second part on */
337 if (rest[0] != '+') {
338 cpos = strchr(temp2, ' ');
342 util_strlcat(string, temp2, maxsize);
343 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
345 util_strlcat(string, event->program_result, maxsize);
346 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
351 err(event->udev, "missing file parameter for attr\n");
353 char value[UTIL_NAME_SIZE] = "";
356 udev_event_apply_subsys_kernel(event, attr, value, sizeof(value), 1);
358 /* try the current device, other matches may have selected */
359 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
362 val = udev_device_get_attr_value(event->dev_parent, attr);
364 util_strlcpy(value, val, sizeof(value));
367 /* look at all devices along the chain of parents */
368 if (value[0] == '\0') {
369 struct udev_device *dev_parent = dev;
373 dbg(event->udev, "looking at '%s'\n", udev_device_get_syspath(dev_parent));
374 val = udev_device_get_attr_value(dev_parent, attr);
376 util_strlcpy(value, val, sizeof(value));
379 dev_parent = udev_device_get_parent(dev_parent);
380 } while (dev_parent != NULL);
386 /* strip trailing whitespace, and replace unwanted characters */
387 size = strlen(value);
388 while (size > 0 && isspace(value[--size]))
390 count = util_replace_chars(value, ALLOWED_CHARS_INPUT);
392 info(event->udev, "%i character(s) replaced\n" , count);
393 util_strlcat(string, value, maxsize);
394 dbg(event->udev, "substitute sysfs value '%s'\n", value);
399 struct udev_device *dev_parent;
402 dev_parent = udev_device_get_parent(event->dev);
403 if (dev_parent == NULL)
405 devnode = udev_device_get_devnode(dev_parent);
406 if (devnode != NULL) {
407 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
409 util_strlcat(string, &devnode[devlen], maxsize);
410 dbg(event->udev, "found parent '%s', got node name '%s'\n",
411 udev_device_get_syspath(dev_parent), &devnode[devlen]);
415 case SUBST_TEMP_NODE:
416 if (event->tmp_node[0] == '\0' && major(udev_device_get_devnum(dev)) > 0) {
417 dbg(event->udev, "create temporary device node for callout\n");
418 snprintf(event->tmp_node, sizeof(event->tmp_node), "%s/.tmp-%u-%u",
419 udev_get_dev_path(event->udev),
420 major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
421 udev_node_mknod(dev, event->tmp_node, makedev(0,0), 0600, 0, 0);
423 util_strlcat(string, event->tmp_node, maxsize);
424 dbg(event->udev, "substitute temporary device node name '%s'\n", event->tmp_node);
427 if (event->name != NULL) {
428 util_strlcat(string, event->name, maxsize);
429 dbg(event->udev, "substitute name '%s'\n", event->name);
431 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
432 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
437 struct udev_list_entry *list_entry;
439 list_entry = udev_device_get_properties_list_entry(dev);
440 util_strlcpy(string, udev_list_entry_get_name(list_entry), maxsize);
441 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
442 util_strlcat(string, " ", maxsize);
443 util_strlcat(string, udev_list_entry_get_name(list_entry), maxsize);
448 util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
449 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
452 util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
453 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
457 dbg(event->udev, "missing attribute\n");
460 struct udev_list_entry *list_entry;
463 list_entry = udev_device_get_properties_list_entry(event->dev);
464 list_entry = udev_list_entry_get_by_name(list_entry, attr);
465 if (list_entry == NULL)
467 value = udev_list_entry_get_value(list_entry);
468 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
469 util_strlcat(string, value, maxsize);
473 err(event->udev, "unknown substitution type=%i\n", type);
476 /* possibly truncate to format-char specified length */
477 if (len >= 0 && len < (int)strlen(head)) {
479 dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
481 util_strlcat(string, temp, maxsize);
485 static void rename_netif_kernel_log(struct ifreq ifr)
490 klog = open("/dev/kmsg", O_WRONLY);
494 f = fdopen(klog, "w");
500 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
501 ifr.ifr_name, ifr.ifr_newname);
505 static int rename_netif(struct udev_event *event)
507 struct udev_device *dev = event->dev;
512 info(event->udev, "changing net interface name from '%s' to '%s'\n",
513 udev_device_get_sysname(dev), event->name);
517 sk = socket(PF_INET, SOCK_DGRAM, 0);
519 err(event->udev, "error opening socket: %m\n");
523 memset(&ifr, 0x00, sizeof(struct ifreq));
524 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
525 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
526 err = ioctl(sk, SIOCSIFNAME, &ifr);
528 rename_netif_kernel_log(ifr);
532 /* see if the destination interface name already exists */
533 if (errno != EEXIST) {
534 err(event->udev, "error changing netif name %s to %s: %m\n",
535 ifr.ifr_name, ifr.ifr_newname);
539 /* free our own name, another process may wait for us */
540 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
541 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
542 err = ioctl(sk, SIOCSIFNAME, &ifr);
544 err(event->udev, "error changing netif name %s to %s: %m\n",
545 ifr.ifr_name, ifr.ifr_newname);
549 /* wait 30 seconds for our target to become available */
550 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
551 util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
554 err = ioctl(sk, SIOCSIFNAME, &ifr);
556 rename_netif_kernel_log(ifr);
560 if (errno != EEXIST) {
561 err(event->udev, "error changing net interface name %s to %s: %m\n",
562 ifr.ifr_name, ifr.ifr_newname);
565 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
566 udev_device_get_devnode(dev), (30 * 20) - loop);
567 usleep(1000 * 1000 / 20);
575 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
577 struct udev_device *dev = event->dev;
580 if (udev_device_get_devpath_old(dev) != NULL) {
581 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
582 info(event->udev, "moved database from '%s' to '%s'\n",
583 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
586 /* add device node */
587 if (major(udev_device_get_devnum(dev)) != 0 &&
588 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
589 char filename[UTIL_PATH_SIZE];
590 struct udev_device *dev_old;
592 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
594 udev_rules_get_name(rules, event);
595 if (event->ignore_device) {
596 info(event->udev, "device event will be ignored\n");
600 if (event->name[0] == '\0') {
601 info(event->udev, "device node creation supressed\n");
605 /* set device node name */
606 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
607 util_strlcat(filename, "/", sizeof(filename));
608 util_strlcat(filename, event->name, sizeof(filename));
609 udev_device_set_devnode(dev, filename);
611 /* read current database entry; cleanup, if it is known device */
612 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
613 if (dev_old != NULL) {
614 info(event->udev, "device '%s' already in database, updating\n",
615 udev_device_get_devpath(dev));
616 udev_node_update_old_links(dev, dev_old, event->test);
617 udev_device_unref(dev_old);
620 udev_device_update_db(dev);
622 err = udev_node_add(dev, event->mode, event->owner, event->group, event->test);
630 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
631 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
633 udev_rules_get_name(rules, event);
634 if (event->ignore_device) {
635 info(event->udev, "device event will be ignored\n");
638 if (event->name[0] == '\0') {
639 info(event->udev, "device renaming supressed\n");
643 /* look if we want to change the name of the netif */
644 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
645 char syspath[UTIL_PATH_SIZE];
648 err = rename_netif(event);
651 info(event->udev, "renamed netif to '%s'\n", event->name);
653 /* remember old name */
654 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
656 /* now change the devpath, because the kernel device name has changed */
657 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
658 pos = strrchr(syspath, '/');
661 util_strlcat(syspath, event->name, sizeof(syspath));
662 udev_device_set_syspath(event->dev, syspath);
663 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
664 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
670 /* remove device node */
671 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
672 /* import database entry and delete it */
673 udev_device_read_db(dev);
675 udev_device_delete_db(dev);
677 if (udev_device_get_devnode(dev) == NULL) {
678 char devnode[UTIL_PATH_SIZE];
680 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
681 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
682 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
683 util_strlcat(devnode, "/", sizeof(devnode));
684 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
685 udev_device_set_devnode(dev, devnode);
688 udev_rules_get_run(rules, event);
689 if (event->ignore_device) {
690 info(event->udev, "device event will be ignored\n");
694 if (udev_device_get_ignore_remove(dev)) {
695 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
699 err = udev_node_remove(dev, event->test);
703 /* default devices */
704 udev_rules_get_run(rules, event);
705 if (event->ignore_device)
706 info(event->udev, "device event will be ignored\n");
711 int udev_event_execute_run(struct udev_event *event)
713 struct udev_list_entry *list_entry;
716 dbg(event->udev, "executing run list\n");
717 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
718 const char *cmd = udev_list_entry_get_name(list_entry);
720 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
721 struct udev_monitor *monitor;
723 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
726 udev_monitor_send_device(monitor, event->dev);
727 udev_monitor_unref(monitor);
729 char program[UTIL_PATH_SIZE];
732 util_strlcpy(program, cmd, sizeof(program));
733 udev_event_apply_format(event, program, sizeof(program));
734 envp = udev_device_get_properties_envp(event->dev);
735 if (run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
736 if (!udev_list_entry_get_flag(list_entry))