2 * Copyright (C) 2003-2010 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/>.
28 #include <sys/ioctl.h>
29 #include <sys/socket.h>
30 #include <linux/sockios.h>
34 struct udev_event *udev_event_new(struct udev_device *dev)
36 struct udev_event *event;
38 event = calloc(1, sizeof(struct udev_event));
43 event->udev = udev_device_get_udev(dev);
44 udev_list_init(&event->run_list);
45 dbg(event->udev, "allocated event %p\n", event);
49 void udev_event_unref(struct udev_event *event)
53 udev_list_cleanup_entries(event->udev, &event->run_list);
54 free(event->tmp_node);
55 free(event->program_result);
57 dbg(event->udev, "free event %p\n", event);
61 size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
63 struct udev_device *dev = event->dev;
83 static const struct subst_map {
88 { .name = "tempnode", .fmt = 'N', .type = SUBST_TEMP_NODE },
89 { .name = "attr", .fmt = 's', .type = SUBST_ATTR },
90 { .name = "sysfs", .fmt = 's', .type = SUBST_ATTR },
91 { .name = "env", .fmt = 'E', .type = SUBST_ENV },
92 { .name = "kernel", .fmt = 'k', .type = SUBST_KERNEL },
93 { .name = "number", .fmt = 'n', .type = SUBST_KERNEL_NUMBER },
94 { .name = "driver", .fmt = 'd', .type = SUBST_DRIVER },
95 { .name = "devpath", .fmt = 'p', .type = SUBST_DEVPATH },
96 { .name = "id", .fmt = 'b', .type = SUBST_ID },
97 { .name = "major", .fmt = 'M', .type = SUBST_MAJOR },
98 { .name = "minor", .fmt = 'm', .type = SUBST_MINOR },
99 { .name = "result", .fmt = 'c', .type = SUBST_RESULT },
100 { .name = "parent", .fmt = 'P', .type = SUBST_PARENT },
101 { .name = "name", .fmt = 'D', .type = SUBST_NAME },
102 { .name = "links", .fmt = 'L', .type = SUBST_LINKS },
103 { .name = "root", .fmt = 'r', .type = SUBST_ROOT },
104 { .name = "sys", .fmt = 'S', .type = SUBST_SYS },
115 enum subst_type type = SUBST_UNKNOWN;
116 char attrbuf[UTIL_PATH_SIZE];
119 while (from[0] != '\0') {
120 if (from[0] == '$') {
121 /* substitute named variable */
124 if (from[1] == '$') {
129 for (i = 0; i < ARRAY_SIZE(map); i++) {
130 if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
132 from += strlen(map[i].name)+1;
133 dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
137 } else if (from[0] == '%') {
138 /* substitute format char */
141 if (from[1] == '%') {
146 for (i = 0; i < ARRAY_SIZE(map); i++) {
147 if (from[1] == map[i].fmt) {
150 dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
167 /* extract possible $format{attr} */
168 if (from[0] == '{') {
172 for (i = 0; from[i] != '}'; i++) {
173 if (from[i] == '\0') {
174 err(event->udev, "missing closing brace for format '%s'\n", src);
178 if (i >= sizeof(attrbuf))
180 memcpy(attrbuf, from, i);
190 l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
191 dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
194 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
195 dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
197 case SUBST_KERNEL_NUMBER:
198 if (udev_device_get_sysnum(dev) == NULL)
200 l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
201 dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
204 if (event->dev_parent == NULL)
206 l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
207 dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
212 if (event->dev_parent == NULL)
215 driver = udev_device_get_driver(event->dev_parent);
218 l = util_strpcpy(&s, l, driver);
219 dbg(event->udev, "substitute driver '%s'\n", driver);
223 char num[UTIL_PATH_SIZE];
225 sprintf(num, "%d", major(udev_device_get_devnum(dev)));
226 l = util_strpcpy(&s, l, num);
227 dbg(event->udev, "substitute major number '%s'\n", num);
231 char num[UTIL_PATH_SIZE];
233 sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
234 l = util_strpcpy(&s, l, num);
235 dbg(event->udev, "substitute minor number '%s'\n", num);
242 if (event->program_result == NULL)
244 /* get part part of the result string */
247 i = strtoul(attr, &rest, 10);
249 char result[UTIL_PATH_SIZE];
250 char tmp[UTIL_PATH_SIZE];
253 dbg(event->udev, "request part #%d of result string\n", i);
254 util_strscpy(result, sizeof(result), event->program_result);
257 while (cpos[0] != '\0' && !isspace(cpos[0]))
259 while (isspace(cpos[0]))
263 err(event->udev, "requested part of result string not found\n");
266 util_strscpy(tmp, sizeof(tmp), cpos);
267 /* %{2+}c copies the whole string from the second part on */
268 if (rest[0] != '+') {
269 cpos = strchr(tmp, ' ');
273 l = util_strpcpy(&s, l, tmp);
274 dbg(event->udev, "substitute part of result string '%s'\n", tmp);
276 l = util_strpcpy(&s, l, event->program_result);
277 dbg(event->udev, "substitute result string '%s'\n", event->program_result);
282 const char *value = NULL;
283 char vbuf[UTIL_NAME_SIZE];
288 err(event->udev, "missing file parameter for attr\n");
292 /* try to read the value specified by "[dmi/id]product_name" */
293 if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
296 /* try to read the attribute the device */
298 value = udev_device_get_sysattr_value(event->dev, attr);
300 /* try to read the attribute of the parent device, other matches have selected */
301 if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
302 value = udev_device_get_sysattr_value(event->dev_parent, attr);
307 /* strip trailing whitespace, and replace unwanted characters */
309 util_strscpy(vbuf, sizeof(vbuf), value);
311 while (len > 0 && isspace(vbuf[--len]))
313 count = udev_util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
315 info(event->udev, "%i character(s) replaced\n" , count);
316 l = util_strpcpy(&s, l, vbuf);
317 dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
321 struct udev_device *dev_parent;
324 dev_parent = udev_device_get_parent(event->dev);
325 if (dev_parent == NULL)
327 devnode = udev_device_get_devnode(dev_parent);
328 if (devnode != NULL) {
329 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
331 l = util_strpcpy(&s, l, &devnode[devlen]);
332 dbg(event->udev, "found parent '%s', got node name '%s'\n",
333 udev_device_get_syspath(dev_parent), &devnode[devlen]);
337 case SUBST_TEMP_NODE: {
340 char filename[UTIL_PATH_SIZE];
343 if (event->tmp_node != NULL) {
344 l = util_strpcpy(&s, l, event->tmp_node);
345 dbg(event->udev, "tempnode: return earlier created one\n");
348 devnum = udev_device_get_devnum(dev);
349 if (major(devnum) == 0)
351 /* lookup kernel provided node */
352 if (udev_device_get_knodename(dev) != NULL) {
353 util_strscpyl(filename, sizeof(filename),
354 udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
355 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
356 l = util_strpcpy(&s, l, filename);
357 dbg(event->udev, "tempnode: return kernel node\n");
361 /* lookup /dev/{char,block}/<maj>:<min> */
362 if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
366 snprintf(filename, sizeof(filename), "%s/%s/%u:%u",
367 udev_get_dev_path(event->udev), devtype,
368 major(udev_device_get_devnum(dev)),
369 minor(udev_device_get_devnum(dev)));
370 if (stat(filename, &statbuf) == 0 && statbuf.st_rdev == devnum) {
371 l = util_strpcpy(&s, l, filename);
372 dbg(event->udev, "tempnode: return maj:min node\n");
375 /* create temporary node */
376 dbg(event->udev, "tempnode: create temp 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, 0600, 0, 0);
384 l = util_strpcpy(&s, l, event->tmp_node);
388 if (event->name != NULL) {
389 l = util_strpcpy(&s, l, event->name);
390 dbg(event->udev, "substitute name '%s'\n", event->name);
392 l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
393 dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
397 size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
398 struct udev_list_entry *list_entry;
400 list_entry = udev_device_get_devlinks_list_entry(dev);
401 if (list_entry == NULL)
403 l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
404 udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
405 l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
409 l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
410 dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
413 l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
414 dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
418 dbg(event->udev, "missing attribute\n");
423 value = udev_device_get_property_value(event->dev, attr);
426 dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
427 l = util_strpcpy(&s, l, value);
431 err(event->udev, "unknown substitution type=%i\n", type);
438 dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
442 static void rename_netif_kernel_log(struct ifreq ifr)
447 klog = open("/dev/kmsg", O_WRONLY);
451 f = fdopen(klog, "w");
457 fprintf(f, "<6>udev[%u]: renamed network interface %s to %s\n",
458 getpid(), ifr.ifr_name, ifr.ifr_newname);
462 static int rename_netif(struct udev_event *event)
464 struct udev_device *dev = event->dev;
470 info(event->udev, "changing net interface name from '%s' to '%s'\n",
471 udev_device_get_sysname(dev), event->name);
473 sk = socket(PF_INET, SOCK_DGRAM, 0);
475 err(event->udev, "error opening socket: %m\n");
479 memset(&ifr, 0x00, sizeof(struct ifreq));
480 util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
481 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
482 err = ioctl(sk, SIOCSIFNAME, &ifr);
484 rename_netif_kernel_log(ifr);
488 /* keep trying if the destination interface name already exists */
493 /* free our own name, another process may wait for us */
494 util_strscpyl(ifr.ifr_newname, IFNAMSIZ, udev_device_get_sysname(dev), "-", event->name, NULL);
495 err = ioctl(sk, SIOCSIFNAME, &ifr);
501 /* log temporary name */
502 rename_netif_kernel_log(ifr);
504 /* wait a maximum of 90 seconds for our target to become available */
505 util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
506 util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
509 const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
511 dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
512 event->name, (90 * 20) - loop);
513 nanosleep(&duration, NULL);
515 err = ioctl(sk, SIOCSIFNAME, &ifr);
517 rename_netif_kernel_log(ifr);
527 err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
532 int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
534 struct udev_device *dev = event->dev;
537 if (strcmp(udev_device_get_action(dev), "remove") == 0) {
538 udev_device_read_db(dev);
539 udev_device_delete_db(dev);
540 udev_device_tag_index(dev, NULL, false);
542 if (major(udev_device_get_devnum(dev)) != 0)
543 udev_watch_end(event->udev, dev);
545 udev_rules_apply_to_event(rules, event);
547 if (major(udev_device_get_devnum(dev)) != 0)
548 err = udev_node_remove(dev);
550 event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
551 if (event->dev_db != NULL) {
552 udev_device_read_db(event->dev_db);
553 udev_device_set_info_loaded(event->dev_db);
555 /* disable watch during event processing */
556 if (major(udev_device_get_devnum(dev)) != 0)
557 udev_watch_end(event->udev, event->dev_db);
560 udev_rules_apply_to_event(rules, event);
562 /* rename a new network interface, if needed */
563 if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
564 event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
565 char syspath[UTIL_PATH_SIZE];
568 err = rename_netif(event);
570 info(event->udev, "renamed netif to '%s'\n", event->name);
572 /* delete stale db file */
573 udev_device_delete_db(dev);
574 udev_device_tag_index(dev, NULL, false);
576 /* remember old name */
577 udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
579 /* now change the devpath, because the kernel device name has changed */
580 util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
581 pos = strrchr(syspath, '/');
584 util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
585 udev_device_set_syspath(event->dev, syspath);
586 udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
587 info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
592 if (major(udev_device_get_devnum(dev)) != 0) {
593 char filename[UTIL_PATH_SIZE];
595 if (event->tmp_node != NULL) {
596 info(event->udev, "cleanup temporary device node\n");
597 util_unlink_secure(event->udev, event->tmp_node);
598 free(event->tmp_node);
599 event->tmp_node = NULL;
602 /* no rule, use kernel provided name */
603 if (event->name == NULL) {
604 if (udev_device_get_knodename(dev) != NULL) {
605 event->name = strdup(udev_device_get_knodename(dev));
606 info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
608 event->name = strdup(udev_device_get_sysname(event->dev));
609 info(event->udev, "no node name set, will use device name '%s'\n", event->name);
613 if (event->name == NULL || event->name[0] == '\0') {
614 udev_device_delete_db(dev);
615 udev_device_tag_index(dev, NULL, false);
616 udev_device_unref(event->dev_db);
618 err(event->udev, "no node name, something went wrong, ignoring\n");
622 if (udev_device_get_knodename(dev) != NULL && strcmp(udev_device_get_knodename(dev), event->name) != 0)
623 err(event->udev, "kernel-provided name '%s' and NAME= '%s' disagree, "
624 "please use SYMLINK+= or change the kernel to provide the proper name\n",
625 udev_device_get_knodename(dev), event->name);
627 /* set device node name */
628 util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
629 udev_device_set_devnode(dev, filename);
632 udev_device_update_db(dev);
633 udev_device_tag_index(dev, event->dev_db, true);
635 if (major(udev_device_get_devnum(dev)) != 0) {
636 /* remove/update possible left-over symlinks from old database entry */
637 if (event->dev_db != NULL)
638 udev_node_update_old_links(dev, event->dev_db);
640 /* change default 0600 to 0660 if a group is assigned */
641 if (event->mode == 0600 && event->gid > 0)
644 err = udev_node_add(dev, event->mode, event->uid, event->gid);
647 udev_device_unref(event->dev_db);
648 event->dev_db = NULL;
654 int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
656 struct udev_list_entry *list_entry;
659 dbg(event->udev, "executing run list\n");
660 udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
661 const char *cmd = udev_list_entry_get_name(list_entry);
663 if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
664 struct udev_monitor *monitor;
666 monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
669 udev_monitor_send_device(monitor, NULL, event->dev);
670 udev_monitor_unref(monitor);
672 char program[UTIL_PATH_SIZE];
675 udev_event_apply_format(event, cmd, program, sizeof(program));
676 envp = udev_device_get_properties_envp(event->dev);
677 if (event->exec_delay > 0) {
678 info(event->udev, "delay execution of '%s'\n", program);
679 sleep(event->exec_delay);
681 if (util_run_program(event->udev, program, envp, NULL, 0, NULL, sigmask, true) != 0) {
682 if (udev_list_entry_get_flags(list_entry))