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 /* 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 void udev_event_apply_format(struct udev_event *event, char *string, size_t maxsize)
101 struct udev_device *dev = event->dev;
102 char temp[UTIL_PATH_SIZE];
103 char temp2[UTIL_PATH_SIZE];
104 char *head, *tail, *cpos, *attr, *rest;
127 static const struct subst_map {
130 enum subst_type type;
132 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
133 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
134 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
135 { .name = "id", .fmt = 'b', .type = SUBST_ID },
136 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
137 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
138 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
139 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
140 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
141 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
142 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
143 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
144 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
145 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
146 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
147 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
148 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
151 enum subst_type type;
152 const struct subst_map *subst;
157 while (head[0] != '\0') {
158 if (head[0] == '$') {
159 /* substitute named variable */
162 if (head[1] == '$') {
163 util_strlcpy(temp, head+2, sizeof(temp));
164 util_strlcpy(head+1, temp, maxsize);
169 for (subst = map; subst->name; subst++) {
170 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
172 tail = head + strlen(subst->name)+1;
173 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
178 err(event->udev, "unknown format variable '%s'\n", head);
179 } else if (head[0] == '%') {
180 /* substitute format char */
183 if (head[1] == '%') {
184 util_strlcpy(temp, head+2, sizeof(temp));
185 util_strlcpy(head+1, temp, maxsize);
191 len = get_format_len(event->udev, &tail);
192 for (subst = map; subst->name; subst++) {
193 if (tail[0] == subst->fmt) {
196 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
201 err(event->udev, "unknown format char '%c'\n", tail[0]);
207 attr = get_format_attribute(event->udev, &tail);
208 util_strlcpy(temp, tail, sizeof(temp));
209 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
213 util_strlcat(string, udev_device_get_devpath(dev), maxsize);
214 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
217 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
218 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
220 case SUBST_KERNEL_NUMBER:
221 if (udev_device_get_sysnum(dev) == NULL)
223 util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
224 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
227 if (event->dev_parent != NULL) {
228 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
229 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
233 if (event->dev_parent != NULL) {
236 driver = udev_device_get_driver(event->dev_parent);
239 util_strlcat(string, driver, maxsize);
240 dbg(event->udev, "substitute driver '%s'\n", driver);
244 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
245 util_strlcat(string, temp2, maxsize);
246 dbg(event->udev, "substitute major number '%s'\n", temp2);
249 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
250 util_strlcat(string, temp2, maxsize);
251 dbg(event->udev, "substitute minor number '%s'\n", temp2);
254 if (event->program_result == NULL)
256 /* get part part of the result string */
259 i = strtoul(attr, &rest, 10);
261 char result[UTIL_PATH_SIZE];
263 dbg(event->udev, "request part #%d of result string\n", i);
264 util_strlcpy(result, event->program_result, sizeof(result));
267 while (cpos[0] != '\0' && !isspace(cpos[0]))
269 while (isspace(cpos[0]))
273 err(event->udev, "requested part of result string not found\n");
276 util_strlcpy(temp2, cpos, sizeof(temp2));
277 /* %{2+}c copies the whole string from the second part on */
278 if (rest[0] != '+') {
279 cpos = strchr(temp2, ' ');
283 util_strlcat(string, temp2, maxsize);
284 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
286 util_strlcat(string, event->program_result, maxsize);
287 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
292 err(event->udev, "missing file parameter for attr\n");
295 char value[UTIL_NAME_SIZE];
299 /* read the value specified by [usb/]*/
300 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
302 /* try to read attribute of the current device */
303 if (value[0] == '\0') {
304 val = udev_device_get_sysattr_value(event->dev, attr);
306 util_strlcpy(value, val, sizeof(value));
309 /* try to read the attribute of the parent device, other matches have selected */
310 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
311 val = udev_device_get_sysattr_value(event->dev_parent, attr);
313 util_strlcpy(value, val, sizeof(value));
319 /* strip trailing whitespace, and replace unwanted characters */
320 size = strlen(value);
321 while (size > 0 && isspace(value[--size]))
323 count = udev_util_replace_chars(value, UDEV_ALLOWED_CHARS_INPUT);
325 info(event->udev, "%i character(s) replaced\n" , count);
326 util_strlcat(string, value, maxsize);
327 dbg(event->udev, "substitute sysfs value '%s'\n", value);
332 struct udev_device *dev_parent;
335 dev_parent = udev_device_get_parent(event->dev);
336 if (dev_parent == NULL)
338 devnode = udev_device_get_devnode(dev_parent);
339 if (devnode != NULL) {
340 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
342 util_strlcat(string, &devnode[devlen], maxsize);
343 dbg(event->udev, "found parent '%s', got node name '%s'\n",
344 udev_device_get_syspath(dev_parent), &devnode[devlen]);
348 case SUBST_TEMP_NODE:
352 char filename[UTIL_PATH_SIZE];
355 if (event->tmp_node != NULL) {
356 util_strlcat(string, event->tmp_node, maxsize);
357 dbg(event->udev, "return existing temporary node\n");
360 devnum = udev_device_get_devnum(dev);
361 if (major(udev_device_get_devnum(dev) == 0))
363 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
367 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
368 udev_get_dev_path(event->udev), devtype,
369 major(udev_device_get_devnum(dev)),
370 minor(udev_device_get_devnum(dev)));
371 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
372 util_strlcat(string, filename, maxsize);
373 dbg(event->udev, "return existing temporary node\n");
376 dbg(event->udev, "create temporary node\n");
377 asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
378 udev_get_dev_path(event->udev), devtype,
379 major(udev_device_get_devnum(dev)),
380 minor(udev_device_get_devnum(dev)));
381 if (event->tmp_node == NULL)
383 udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
384 util_strlcat(string, event->tmp_node, maxsize);
388 if (event->name != NULL) {
389 util_strlcat(string, event->name, maxsize);
390 dbg(event->udev, "substitute name '%s'\n", event->name);
392 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
393 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
398 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
399 struct udev_list_entry *list_entry;
401 list_entry = udev_device_get_devlinks_list_entry(dev);
402 if (list_entry == NULL)
404 util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
405 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
406 util_strlcat(string, " ", maxsize);
407 util_strlcat(string, &udev_list_entry_get_name(list_entry)[devlen], maxsize);
412 util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
413 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
416 util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
417 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
421 dbg(event->udev, "missing attribute\n");
424 struct udev_list_entry *list_entry;
427 list_entry = udev_device_get_properties_list_entry(event->dev);
428 list_entry = udev_list_entry_get_by_name(list_entry, attr);
429 if (list_entry == NULL)
431 value = udev_list_entry_get_value(list_entry);
434 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
435 util_strlcat(string, value, maxsize);
439 err(event->udev, "unknown substitution type=%i\n", type);
442 /* possibly truncate to format-char specified length */
443 if (len >= 0 && len < (int)strlen(head)) {
445 dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
447 util_strlcat(string, temp, maxsize);
451 static void rename_netif_kernel_log(struct ifreq ifr)
456 klog = open("/dev/kmsg", O_WRONLY);
460 f = fdopen(klog, "w");
466 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
467 ifr.ifr_name, ifr.ifr_newname);
471 static int rename_netif(struct udev_event *event)
473 struct udev_device *dev = event->dev;
478 info(event->udev, "changing net interface name from '%s' to '%s'\n",
479 udev_device_get_sysname(dev), event->name);
483 sk = socket(PF_INET, SOCK_DGRAM, 0);
485 err(event->udev, "error opening socket: %m\n");
489 memset(&ifr, 0x00, sizeof(struct ifreq));
490 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
491 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
492 err = ioctl(sk, SIOCSIFNAME, &ifr);
494 rename_netif_kernel_log(ifr);
498 /* see if the destination interface name already exists */
499 if (errno != EEXIST) {
500 err(event->udev, "error changing netif name %s to %s: %m\n",
501 ifr.ifr_name, ifr.ifr_newname);
505 /* free our own name, another process may wait for us */
506 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
507 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
508 err = ioctl(sk, SIOCSIFNAME, &ifr);
510 err(event->udev, "error changing netif name %s to %s: %m\n",
511 ifr.ifr_name, ifr.ifr_newname);
515 /* wait 30 seconds for our target to become available */
516 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
517 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
520 err = ioctl(sk, SIOCSIFNAME, &ifr);
522 rename_netif_kernel_log(ifr);
526 if (errno != EEXIST) {
527 err(event->udev, "error changing net interface name %s to %s: %m\n",
528 ifr.ifr_name, ifr.ifr_newname);
531 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
532 event->name, (30 * 20) - loop);
533 usleep(1000 * 1000 / 20);
541 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
543 struct udev_device *dev = event->dev;
546 if (udev_device_get_devpath_old(dev) != NULL) {
547 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
548 info(event->udev, "moved database from '%s' to '%s'\n",
549 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
552 /* add device node */
553 if (major(udev_device_get_devnum(dev)) != 0 &&
554 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
555 char filename[UTIL_PATH_SIZE];
556 struct udev_device *dev_old;
558 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
560 udev_rules_apply_to_event(rules, event);
561 if (event->tmp_node != NULL) {
562 dbg(event->udev, "removing temporary device node\n");
563 util_unlink_secure(event->udev, event->tmp_node);
564 free(event->tmp_node);
565 event->tmp_node = NULL;
568 if (event->ignore_device) {
569 info(event->udev, "device event will be ignored\n");
573 if (event->name != NULL && event->name[0] == '\0') {
574 info(event->udev, "device node creation supressed\n");
578 if (event->name == NULL) {
579 info(event->udev, "no node name set, will use kernel name '%s'\n",
580 udev_device_get_sysname(event->dev));
581 event->name = strdup(udev_device_get_sysname(event->dev));
582 if (event->name == NULL)
586 /* set device node name */
587 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
588 util_strlcat(filename, "/", sizeof(filename));
589 util_strlcat(filename, event->name, sizeof(filename));
590 udev_device_set_devnode(dev, filename);
592 /* read current database entry */
593 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
594 if (dev_old != NULL) {
595 udev_device_read_db(dev_old);
596 udev_device_set_info_loaded(dev_old);
599 /* update database, create node and symlinks */
600 udev_device_update_db(dev);
601 err = udev_node_add(dev, event->mode, event->uid, event->gid, event->test);
603 /* remove/update possible left-over symlinks from old database entry */
604 if (dev_old != NULL) {
605 udev_node_update_old_links(dev, dev_old, event->test);
606 udev_device_unref(dev_old);
612 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
613 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
615 udev_rules_apply_to_event(rules, event);
616 if (event->ignore_device) {
617 info(event->udev, "device event will be ignored\n");
620 if (event->name == NULL)
623 /* look if we want to change the name of the netif */
624 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
625 char syspath[UTIL_PATH_SIZE];
628 err = rename_netif(event);
631 info(event->udev, "renamed netif to '%s'\n", event->name);
633 /* remember old name */
634 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
636 /* now change the devpath, because the kernel device name has changed */
637 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
638 pos = strrchr(syspath, '/');
641 util_strlcat(syspath, event->name, sizeof(syspath));
642 udev_device_set_syspath(event->dev, syspath);
643 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
644 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
650 /* remove device node */
651 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
652 /* import database entry and delete it */
653 udev_device_read_db(dev);
654 udev_device_set_info_loaded(dev);
655 udev_device_delete_db(dev);
657 if (udev_device_get_devnode(dev) == NULL) {
658 char devnode[UTIL_PATH_SIZE];
660 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
661 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
662 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
663 util_strlcat(devnode, "/", sizeof(devnode));
664 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
665 udev_device_set_devnode(dev, devnode);
668 udev_rules_apply_to_event(rules, event);
669 if (event->ignore_device) {
670 info(event->udev, "device event will be ignored\n");
674 if (udev_device_get_ignore_remove(dev)) {
675 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
679 err = udev_node_remove(dev, event->test);
683 /* default devices */
684 udev_rules_apply_to_event(rules, event);
685 if (event->ignore_device)
686 info(event->udev, "device event will be ignored\n");
691 int udev_event_execute_run(struct udev_event *event)
693 struct udev_list_entry *list_entry;
696 dbg(event->udev, "executing run list\n");
697 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
698 const char *cmd = udev_list_entry_get_name(list_entry);
700 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
701 struct udev_monitor *monitor;
703 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
706 udev_monitor_send_device(monitor, event->dev);
707 udev_monitor_unref(monitor);
709 char program[UTIL_PATH_SIZE];
712 util_strlcpy(program, cmd, sizeof(program));
713 udev_event_apply_format(event, program, sizeof(program));
715 fprintf(stderr, "run %s (%llu) '%s'\n",
716 udev_device_get_syspath(event->dev),
717 udev_device_get_seqnum(event->dev),
719 envp = udev_device_get_properties_envp(event->dev);
720 if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
721 if (!udev_list_entry_get_flag(list_entry))