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) {
234 const char *driver = udev_device_get_driver(event->dev_parent);
238 util_strlcat(string, driver, maxsize);
239 dbg(event->udev, "substitute driver '%s'\n", driver);
243 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
244 util_strlcat(string, temp2, maxsize);
245 dbg(event->udev, "substitute major number '%s'\n", temp2);
248 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
249 util_strlcat(string, temp2, maxsize);
250 dbg(event->udev, "substitute minor number '%s'\n", temp2);
253 if (event->program_result == NULL)
255 /* get part part of the result string */
258 i = strtoul(attr, &rest, 10);
260 char result[UTIL_PATH_SIZE];
262 dbg(event->udev, "request part #%d of result string\n", i);
263 util_strlcpy(result, event->program_result, sizeof(result));
266 while (cpos[0] != '\0' && !isspace(cpos[0]))
268 while (isspace(cpos[0]))
272 err(event->udev, "requested part of result string not found\n");
275 util_strlcpy(temp2, cpos, sizeof(temp2));
276 /* %{2+}c copies the whole string from the second part on */
277 if (rest[0] != '+') {
278 cpos = strchr(temp2, ' ');
282 util_strlcat(string, temp2, maxsize);
283 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
285 util_strlcat(string, event->program_result, maxsize);
286 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
291 err(event->udev, "missing file parameter for attr\n");
294 char value[UTIL_NAME_SIZE] = "";
297 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
299 val = udev_device_get_sysattr_value(event->dev, attr);
301 util_strlcpy(value, val, sizeof(value));
303 /* try the current device, other matches may have selected */
304 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
305 val = udev_device_get_sysattr_value(event->dev_parent, attr);
307 util_strlcpy(value, val, sizeof(value));
313 /* strip trailing whitespace, and replace unwanted characters */
314 size = strlen(value);
315 while (size > 0 && isspace(value[--size]))
317 count = util_replace_chars(value, ALLOWED_CHARS_INPUT);
319 info(event->udev, "%i character(s) replaced\n" , count);
320 util_strlcat(string, value, maxsize);
321 dbg(event->udev, "substitute sysfs value '%s'\n", value);
326 struct udev_device *dev_parent;
329 dev_parent = udev_device_get_parent(event->dev);
330 if (dev_parent == NULL)
332 devnode = udev_device_get_devnode(dev_parent);
333 if (devnode != NULL) {
334 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
336 util_strlcat(string, &devnode[devlen], maxsize);
337 dbg(event->udev, "found parent '%s', got node name '%s'\n",
338 udev_device_get_syspath(dev_parent), &devnode[devlen]);
342 case SUBST_TEMP_NODE:
346 char filename[UTIL_PATH_SIZE];
349 if (event->tmp_node != NULL) {
350 util_strlcat(string, event->tmp_node, maxsize);
351 dbg(event->udev, "return existing temporary node\n");
354 devnum = udev_device_get_devnum(dev);
355 if (major(udev_device_get_devnum(dev) == 0))
357 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
361 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
362 udev_get_dev_path(event->udev), devtype,
363 major(udev_device_get_devnum(dev)),
364 minor(udev_device_get_devnum(dev)));
365 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
366 util_strlcat(string, filename, maxsize);
367 dbg(event->udev, "return existing temporary node\n");
370 dbg(event->udev, "create temporary node\n");
371 asprintf(&event->tmp_node, "%s/.tmp-%s-%u:%u",
372 udev_get_dev_path(event->udev), devtype,
373 major(udev_device_get_devnum(dev)),
374 minor(udev_device_get_devnum(dev)));
375 if (event->tmp_node == NULL)
377 udev_node_mknod(dev, event->tmp_node, makedev(0, 0), 0600, 0, 0);
378 util_strlcat(string, event->tmp_node, maxsize);
382 if (event->name != NULL) {
383 util_strlcat(string, event->name, maxsize);
384 dbg(event->udev, "substitute name '%s'\n", event->name);
386 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
387 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
392 struct udev_list_entry *list_entry;
394 list_entry = udev_device_get_properties_list_entry(dev);
395 util_strlcpy(string, udev_list_entry_get_name(list_entry), 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), 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");
415 struct udev_list_entry *list_entry;
418 list_entry = udev_device_get_properties_list_entry(event->dev);
419 list_entry = udev_list_entry_get_by_name(list_entry, attr);
420 if (list_entry == NULL)
422 value = udev_list_entry_get_value(list_entry);
423 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
424 util_strlcat(string, value, maxsize);
428 err(event->udev, "unknown substitution type=%i\n", type);
431 /* possibly truncate to format-char specified length */
432 if (len >= 0 && len < (int)strlen(head)) {
434 dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
436 util_strlcat(string, temp, maxsize);
440 static void rename_netif_kernel_log(struct ifreq ifr)
445 klog = open("/dev/kmsg", O_WRONLY);
449 f = fdopen(klog, "w");
455 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
456 ifr.ifr_name, ifr.ifr_newname);
460 static int rename_netif(struct udev_event *event)
462 struct udev_device *dev = event->dev;
467 info(event->udev, "changing net interface name from '%s' to '%s'\n",
468 udev_device_get_sysname(dev), event->name);
472 sk = socket(PF_INET, SOCK_DGRAM, 0);
474 err(event->udev, "error opening socket: %m\n");
478 memset(&ifr, 0x00, sizeof(struct ifreq));
479 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
480 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
481 err = ioctl(sk, SIOCSIFNAME, &ifr);
483 rename_netif_kernel_log(ifr);
487 /* see if the destination interface name already exists */
488 if (errno != EEXIST) {
489 err(event->udev, "error changing netif name %s to %s: %m\n",
490 ifr.ifr_name, ifr.ifr_newname);
494 /* free our own name, another process may wait for us */
495 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
496 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
497 err = ioctl(sk, SIOCSIFNAME, &ifr);
499 err(event->udev, "error changing netif name %s to %s: %m\n",
500 ifr.ifr_name, ifr.ifr_newname);
504 /* wait 30 seconds for our target to become available */
505 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
506 util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
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 udev_device_get_devnode(dev), (30 * 20) - loop);
522 usleep(1000 * 1000 / 20);
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_devpath_old(dev) != NULL) {
536 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
537 info(event->udev, "moved database from '%s' to '%s'\n",
538 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
541 /* add device node */
542 if (major(udev_device_get_devnum(dev)) != 0 &&
543 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
544 char filename[UTIL_PATH_SIZE];
545 struct udev_device *dev_old;
547 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
549 udev_rules_apply_to_event(rules, event);
550 if (event->tmp_node != NULL) {
551 dbg(event->udev, "removing temporary device node\n");
552 util_unlink_secure(event->udev, event->tmp_node);
553 free(event->tmp_node);
554 event->tmp_node = NULL;
557 if (event->ignore_device) {
558 info(event->udev, "device event will be ignored\n");
562 if (event->name != NULL && event->name[0] == '\0') {
563 info(event->udev, "device node creation supressed\n");
567 if (event->name == NULL) {
568 info(event->udev, "no node name set, will use kernel name '%s'\n",
569 udev_device_get_sysname(event->dev));
570 event->name = strdup(udev_device_get_sysname(event->dev));
571 if (event->name == NULL)
575 /* set device node name */
576 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
577 util_strlcat(filename, "/", sizeof(filename));
578 util_strlcat(filename, event->name, sizeof(filename));
579 udev_device_set_devnode(dev, filename);
581 /* read current database entry; cleanup, if it is known device */
582 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
583 if (dev_old != NULL) {
584 if (udev_device_get_devnode(dev_old) != NULL) {
585 info(event->udev, "device node '%s' already in database, updating\n",
586 udev_device_get_devnode(dev_old));
587 udev_node_update_old_links(dev, dev_old, event->test);
589 udev_device_unref(dev_old);
592 udev_device_update_db(dev);
594 err = udev_node_add(dev, event->mode, event->uid, event->gid, event->test);
602 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
603 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
605 udev_rules_apply_to_event(rules, event);
606 if (event->ignore_device) {
607 info(event->udev, "device event will be ignored\n");
610 if (event->name == NULL)
613 /* look if we want to change the name of the netif */
614 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
615 char syspath[UTIL_PATH_SIZE];
618 err = rename_netif(event);
621 info(event->udev, "renamed netif to '%s'\n", event->name);
623 /* remember old name */
624 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
626 /* now change the devpath, because the kernel device name has changed */
627 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
628 pos = strrchr(syspath, '/');
631 util_strlcat(syspath, event->name, sizeof(syspath));
632 udev_device_set_syspath(event->dev, syspath);
633 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
634 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
640 /* remove device node */
641 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
642 /* import database entry and delete it */
643 udev_device_read_db(dev);
645 udev_device_delete_db(dev);
647 if (udev_device_get_devnode(dev) == NULL) {
648 char devnode[UTIL_PATH_SIZE];
650 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
651 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
652 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
653 util_strlcat(devnode, "/", sizeof(devnode));
654 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
655 udev_device_set_devnode(dev, devnode);
658 udev_rules_apply_to_event(rules, event);
659 if (event->ignore_device) {
660 info(event->udev, "device event will be ignored\n");
664 if (udev_device_get_ignore_remove(dev)) {
665 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
669 err = udev_node_remove(dev, event->test);
673 /* default devices */
674 udev_rules_apply_to_event(rules, event);
675 if (event->ignore_device)
676 info(event->udev, "device event will be ignored\n");
681 int udev_event_execute_run(struct udev_event *event)
683 struct udev_list_entry *list_entry;
686 dbg(event->udev, "executing run list\n");
687 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
688 const char *cmd = udev_list_entry_get_name(list_entry);
690 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
691 struct udev_monitor *monitor;
693 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
696 udev_monitor_send_device(monitor, event->dev);
697 udev_monitor_unref(monitor);
699 char program[UTIL_PATH_SIZE];
702 util_strlcpy(program, cmd, sizeof(program));
703 udev_event_apply_format(event, program, sizeof(program));
704 envp = udev_device_get_properties_envp(event->dev);
705 if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
706 if (!udev_list_entry_get_flag(list_entry))