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)
50 udev_list_cleanup_entries(event->udev, &event->run_list);
51 dbg(event->udev, "free event %p\n", event);
55 /* extract possible {attr} and move str behind it */
56 static char *get_format_attribute(struct udev *udev, char **str)
62 pos = strchr(*str, '}');
64 err(udev, "missing closing brace for format\n");
70 dbg(udev, "attribute='%s', str='%s'\n", attr, *str);
75 /* extract possible format length and move str behind it*/
76 static int get_format_len(struct udev *udev, char **str)
81 if (isdigit(*str[0])) {
82 num = (int) strtoul(*str, &tail, 10);
85 dbg(udev, "format length=%i\n", num);
88 err(udev, "format parsing error '%s'\n", *str);
94 void udev_event_apply_format(struct udev_event *event, char *string, size_t maxsize)
96 struct udev_device *dev = event->dev;
97 char temp[UTIL_PATH_SIZE];
98 char temp2[UTIL_PATH_SIZE];
99 char *head, *tail, *cpos, *attr, *rest;
122 static const struct subst_map {
125 enum subst_type type;
127 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
128 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
129 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
130 { .name = "id", .fmt = 'b', .type = SUBST_ID },
131 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
132 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
133 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
134 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
135 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
136 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
137 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
138 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
139 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
140 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
141 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
142 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
143 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
146 enum subst_type type;
147 const struct subst_map *subst;
152 while (head[0] != '\0') {
153 if (head[0] == '$') {
154 /* substitute named variable */
157 if (head[1] == '$') {
158 util_strlcpy(temp, head+2, sizeof(temp));
159 util_strlcpy(head+1, temp, maxsize);
164 for (subst = map; subst->name; subst++) {
165 if (strncasecmp(&head[1], subst->name, strlen(subst->name)) == 0) {
167 tail = head + strlen(subst->name)+1;
168 dbg(event->udev, "will substitute format name '%s'\n", subst->name);
173 err(event->udev, "unknown format variable '%s'\n", head);
174 } else if (head[0] == '%') {
175 /* substitute format char */
178 if (head[1] == '%') {
179 util_strlcpy(temp, head+2, sizeof(temp));
180 util_strlcpy(head+1, temp, maxsize);
186 len = get_format_len(event->udev, &tail);
187 for (subst = map; subst->name; subst++) {
188 if (tail[0] == subst->fmt) {
191 dbg(event->udev, "will substitute format char '%c'\n", subst->fmt);
196 err(event->udev, "unknown format char '%c'\n", tail[0]);
202 attr = get_format_attribute(event->udev, &tail);
203 util_strlcpy(temp, tail, sizeof(temp));
204 dbg(event->udev, "format=%i, string='%s', tail='%s'\n", type ,string, tail);
208 util_strlcat(string, udev_device_get_devpath(dev), maxsize);
209 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
212 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
213 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
215 case SUBST_KERNEL_NUMBER:
216 if (udev_device_get_sysnum(dev) == NULL)
218 util_strlcat(string, udev_device_get_sysnum(dev), maxsize);
219 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
222 if (event->dev_parent != NULL) {
223 util_strlcat(string, udev_device_get_sysname(event->dev_parent), maxsize);
224 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
228 if (event->dev_parent != NULL) {
229 const char *driver = udev_device_get_driver(event->dev_parent);
233 util_strlcat(string, driver, maxsize);
234 dbg(event->udev, "substitute driver '%s'\n", driver);
238 sprintf(temp2, "%d", major(udev_device_get_devnum(dev)));
239 util_strlcat(string, temp2, maxsize);
240 dbg(event->udev, "substitute major number '%s'\n", temp2);
243 sprintf(temp2, "%d", minor(udev_device_get_devnum(dev)));
244 util_strlcat(string, temp2, maxsize);
245 dbg(event->udev, "substitute minor number '%s'\n", temp2);
248 if (event->program_result[0] == '\0')
250 /* get part part of the result string */
253 i = strtoul(attr, &rest, 10);
255 dbg(event->udev, "request part #%d of result string\n", i);
256 cpos = event->program_result;
258 while (cpos[0] != '\0' && !isspace(cpos[0]))
260 while (isspace(cpos[0]))
264 err(event->udev, "requested part of result string not found\n");
267 util_strlcpy(temp2, cpos, sizeof(temp2));
268 /* %{2+}c copies the whole string from the second part on */
269 if (rest[0] != '+') {
270 cpos = strchr(temp2, ' ');
274 util_strlcat(string, temp2, maxsize);
275 dbg(event->udev, "substitute part of result string '%s'\n", temp2);
277 util_strlcat(string, event->program_result, maxsize);
278 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
283 err(event->udev, "missing file parameter for attr\n");
286 char value[UTIL_NAME_SIZE] = "";
289 util_resolve_subsys_kernel(event->udev, attr, value, sizeof(value), 1);
291 val = udev_device_get_sysattr_value(event->dev, attr);
293 util_strlcpy(value, val, sizeof(value));
295 /* try the current device, other matches may have selected */
296 if (value[0] == '\0' && event->dev_parent != NULL && event->dev_parent != event->dev) {
297 val = udev_device_get_sysattr_value(event->dev_parent, attr);
299 util_strlcpy(value, val, sizeof(value));
305 /* strip trailing whitespace, and replace unwanted characters */
306 size = strlen(value);
307 while (size > 0 && isspace(value[--size]))
309 count = util_replace_chars(value, ALLOWED_CHARS_INPUT);
311 info(event->udev, "%i character(s) replaced\n" , count);
312 util_strlcat(string, value, maxsize);
313 dbg(event->udev, "substitute sysfs value '%s'\n", value);
318 struct udev_device *dev_parent;
321 dev_parent = udev_device_get_parent(event->dev);
322 if (dev_parent == NULL)
324 devnode = udev_device_get_devnode(dev_parent);
325 if (devnode != NULL) {
326 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
328 util_strlcat(string, &devnode[devlen], maxsize);
329 dbg(event->udev, "found parent '%s', got node name '%s'\n",
330 udev_device_get_syspath(dev_parent), &devnode[devlen]);
334 case SUBST_TEMP_NODE:
335 if (event->tmp_node[0] == '\0' && major(udev_device_get_devnum(dev)) > 0) {
336 dbg(event->udev, "create temporary device node for callout\n");
337 snprintf(event->tmp_node, sizeof(event->tmp_node), "%s/.tmp-%u-%u",
338 udev_get_dev_path(event->udev),
339 major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
340 udev_node_mknod(dev, event->tmp_node, makedev(0,0), 0600, 0, 0);
342 util_strlcat(string, event->tmp_node, maxsize);
343 dbg(event->udev, "substitute temporary device node name '%s'\n", event->tmp_node);
346 if (event->name != NULL) {
347 util_strlcat(string, event->name, maxsize);
348 dbg(event->udev, "substitute name '%s'\n", event->name);
350 util_strlcat(string, udev_device_get_sysname(dev), maxsize);
351 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
356 struct udev_list_entry *list_entry;
358 list_entry = udev_device_get_properties_list_entry(dev);
359 util_strlcpy(string, udev_list_entry_get_name(list_entry), maxsize);
360 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry)) {
361 util_strlcat(string, " ", maxsize);
362 util_strlcat(string, udev_list_entry_get_name(list_entry), maxsize);
367 util_strlcat(string, udev_get_dev_path(event->udev), maxsize);
368 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
371 util_strlcat(string, udev_get_sys_path(event->udev), maxsize);
372 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
376 dbg(event->udev, "missing attribute\n");
379 struct udev_list_entry *list_entry;
382 list_entry = udev_device_get_properties_list_entry(event->dev);
383 list_entry = udev_list_entry_get_by_name(list_entry, attr);
384 if (list_entry == NULL)
386 value = udev_list_entry_get_value(list_entry);
387 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
388 util_strlcat(string, value, maxsize);
392 err(event->udev, "unknown substitution type=%i\n", type);
395 /* possibly truncate to format-char specified length */
396 if (len >= 0 && len < (int)strlen(head)) {
398 dbg(event->udev, "truncate to %i chars, subtitution string becomes '%s'\n", len, head);
400 util_strlcat(string, temp, maxsize);
404 static void rename_netif_kernel_log(struct ifreq ifr)
409 klog = open("/dev/kmsg", O_WRONLY);
413 f = fdopen(klog, "w");
419 fprintf(f, "<6>udev: renamed network interface %s to %s\n",
420 ifr.ifr_name, ifr.ifr_newname);
424 static int rename_netif(struct udev_event *event)
426 struct udev_device *dev = event->dev;
431 info(event->udev, "changing net interface name from '%s' to '%s'\n",
432 udev_device_get_sysname(dev), event->name);
436 sk = socket(PF_INET, SOCK_DGRAM, 0);
438 err(event->udev, "error opening socket: %m\n");
442 memset(&ifr, 0x00, sizeof(struct ifreq));
443 util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
444 util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
445 err = ioctl(sk, SIOCSIFNAME, &ifr);
447 rename_netif_kernel_log(ifr);
451 /* see if the destination interface name already exists */
452 if (errno != EEXIST) {
453 err(event->udev, "error changing netif name %s to %s: %m\n",
454 ifr.ifr_name, ifr.ifr_newname);
458 /* free our own name, another process may wait for us */
459 util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
460 util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
461 err = ioctl(sk, SIOCSIFNAME, &ifr);
463 err(event->udev, "error changing netif name %s to %s: %m\n",
464 ifr.ifr_name, ifr.ifr_newname);
468 /* wait 30 seconds for our target to become available */
469 util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
470 util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
473 err = ioctl(sk, SIOCSIFNAME, &ifr);
475 rename_netif_kernel_log(ifr);
479 if (errno != EEXIST) {
480 err(event->udev, "error changing net interface name %s to %s: %m\n",
481 ifr.ifr_name, ifr.ifr_newname);
484 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
485 udev_device_get_devnode(dev), (30 * 20) - loop);
486 usleep(1000 * 1000 / 20);
494 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
496 struct udev_device *dev = event->dev;
499 if (udev_device_get_devpath_old(dev) != NULL) {
500 if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
501 info(event->udev, "moved database from '%s' to '%s'\n",
502 udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
505 /* add device node */
506 if (major(udev_device_get_devnum(dev)) != 0 &&
507 (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
508 char filename[UTIL_PATH_SIZE];
509 struct udev_device *dev_old;
511 dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
513 udev_rules_apply_to_event(rules, event);
514 if (event->tmp_node[0] != '\0') {
515 dbg(event->udev, "removing temporary device node\n");
516 util_unlink_secure(event->udev, event->tmp_node);
517 event->tmp_node[0] = '\0';
520 if (event->ignore_device) {
521 info(event->udev, "device event will be ignored\n");
525 if (event->name_ignore) {
526 info(event->udev, "device node creation supressed\n");
530 if (event->name[0] == '\0') {
531 info(event->udev, "no node name set, will use kernel name '%s'\n",
532 udev_device_get_sysname(event->dev));
533 util_strlcpy(event->name, udev_device_get_sysname(event->dev), sizeof(event->name));
536 /* set device node name */
537 util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
538 util_strlcat(filename, "/", sizeof(filename));
539 util_strlcat(filename, event->name, sizeof(filename));
540 udev_device_set_devnode(dev, filename);
542 /* read current database entry; cleanup, if it is known device */
543 dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
544 if (dev_old != NULL) {
545 if (udev_device_get_devnode(dev_old) != NULL) {
546 info(event->udev, "device node '%s' already in database, updating\n",
547 udev_device_get_devnode(dev_old));
548 udev_node_update_old_links(dev, dev_old, event->test);
550 udev_device_unref(dev_old);
553 udev_device_update_db(dev);
555 err = udev_node_add(dev, event->mode, event->uid, event->gid, event->test);
563 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
564 dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
566 udev_rules_apply_to_event(rules, event);
567 if (event->ignore_device) {
568 info(event->udev, "device event will be ignored\n");
571 if (event->name[0] == '\0') {
572 info(event->udev, "device renaming supressed\n");
576 /* look if we want to change the name of the netif */
577 if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
578 char syspath[UTIL_PATH_SIZE];
581 err = rename_netif(event);
584 info(event->udev, "renamed netif to '%s'\n", event->name);
586 /* remember old name */
587 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
589 /* now change the devpath, because the kernel device name has changed */
590 util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
591 pos = strrchr(syspath, '/');
594 util_strlcat(syspath, event->name, sizeof(syspath));
595 udev_device_set_syspath(event->dev, syspath);
596 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
597 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
603 /* remove device node */
604 if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
605 /* import database entry and delete it */
606 udev_device_read_db(dev);
608 udev_device_delete_db(dev);
610 if (udev_device_get_devnode(dev) == NULL) {
611 char devnode[UTIL_PATH_SIZE];
613 info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
614 udev_device_get_syspath(dev), udev_device_get_sysname(dev));
615 util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
616 util_strlcat(devnode, "/", sizeof(devnode));
617 util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
618 udev_device_set_devnode(dev, devnode);
621 udev_rules_apply_to_event(rules, event);
622 if (event->ignore_device) {
623 info(event->udev, "device event will be ignored\n");
627 if (udev_device_get_ignore_remove(dev)) {
628 info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
632 err = udev_node_remove(dev, event->test);
636 /* default devices */
637 udev_rules_apply_to_event(rules, event);
638 if (event->ignore_device)
639 info(event->udev, "device event will be ignored\n");
644 int udev_event_execute_run(struct udev_event *event)
646 struct udev_list_entry *list_entry;
649 dbg(event->udev, "executing run list\n");
650 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
651 const char *cmd = udev_list_entry_get_name(list_entry);
653 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
654 struct udev_monitor *monitor;
656 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
659 udev_monitor_send_device(monitor, event->dev);
660 udev_monitor_unref(monitor);
662 char program[UTIL_PATH_SIZE];
665 util_strlcpy(program, cmd, sizeof(program));
666 udev_event_apply_format(event, program, sizeof(program));
667 envp = udev_device_get_properties_envp(event->dev);
668 if (util_run_program(event->udev, program, envp, NULL, 0, NULL) != 0) {
669 if (!udev_list_entry_get_flag(list_entry))