]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udev/udev-event.c
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
];
298 /* read the value specified by [usb/]*/
299 util_resolve_subsys_kernel(event
->udev
, attr
, value
, sizeof(value
), 1);
301 /* try to read attribute of the current device */
302 if (value
[0] == '\0') {
303 val
= udev_device_get_sysattr_value(event
->dev
, attr
);
305 util_strlcpy(value
, val
, sizeof(value
));
308 /* try to read the attribute of the parent device, other matches have selected */
309 if (value
[0] == '\0' && event
->dev_parent
!= NULL
&& event
->dev_parent
!= event
->dev
) {
310 val
= udev_device_get_sysattr_value(event
->dev_parent
, attr
);
312 util_strlcpy(value
, val
, sizeof(value
));
318 /* strip trailing whitespace, and replace unwanted characters */
319 size
= strlen(value
);
320 while (size
> 0 && isspace(value
[--size
]))
322 count
= udev_util_replace_chars(value
, UDEV_ALLOWED_CHARS_INPUT
);
324 info(event
->udev
, "%i character(s) replaced\n" , count
);
325 util_strlcat(string
, value
, maxsize
);
326 dbg(event
->udev
, "substitute sysfs value '%s'\n", value
);
331 struct udev_device
*dev_parent
;
334 dev_parent
= udev_device_get_parent(event
->dev
);
335 if (dev_parent
== NULL
)
337 devnode
= udev_device_get_devnode(dev_parent
);
338 if (devnode
!= NULL
) {
339 size_t devlen
= strlen(udev_get_dev_path(event
->udev
))+1;
341 util_strlcat(string
, &devnode
[devlen
], maxsize
);
342 dbg(event
->udev
, "found parent '%s', got node name '%s'\n",
343 udev_device_get_syspath(dev_parent
), &devnode
[devlen
]);
347 case SUBST_TEMP_NODE
:
351 char filename
[UTIL_PATH_SIZE
];
354 if (event
->tmp_node
!= NULL
) {
355 util_strlcat(string
, event
->tmp_node
, maxsize
);
356 dbg(event
->udev
, "return existing temporary node\n");
359 devnum
= udev_device_get_devnum(dev
);
360 if (major(udev_device_get_devnum(dev
) == 0))
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 util_strlcat(string
, filename
, maxsize
);
372 dbg(event
->udev
, "return existing temporary node\n");
375 dbg(event
->udev
, "create temporary node\n");
376 asprintf(&event
->tmp_node
, "%s/.tmp-%s-%u:%u",
377 udev_get_dev_path(event
->udev
), devtype
,
378 major(udev_device_get_devnum(dev
)),
379 minor(udev_device_get_devnum(dev
)));
380 if (event
->tmp_node
== NULL
)
382 udev_node_mknod(dev
, event
->tmp_node
, makedev(0, 0), 0600, 0, 0);
383 util_strlcat(string
, event
->tmp_node
, maxsize
);
387 if (event
->name
!= NULL
) {
388 util_strlcat(string
, event
->name
, maxsize
);
389 dbg(event
->udev
, "substitute name '%s'\n", event
->name
);
391 util_strlcat(string
, udev_device_get_sysname(dev
), maxsize
);
392 dbg(event
->udev
, "substitute sysname '%s'\n", udev_device_get_sysname(dev
));
397 struct udev_list_entry
*list_entry
;
399 list_entry
= udev_device_get_devlinks_list_entry(dev
);
400 util_strlcat(string
, udev_list_entry_get_name(list_entry
), maxsize
);
401 udev_list_entry_foreach(list_entry
, udev_list_entry_get_next(list_entry
)) {
402 util_strlcat(string
, " ", maxsize
);
403 util_strlcat(string
, udev_list_entry_get_name(list_entry
), maxsize
);
408 util_strlcat(string
, udev_get_dev_path(event
->udev
), maxsize
);
409 dbg(event
->udev
, "substitute udev_root '%s'\n", udev_get_dev_path(event
->udev
));
412 util_strlcat(string
, udev_get_sys_path(event
->udev
), maxsize
);
413 dbg(event
->udev
, "substitute sys_path '%s'\n", udev_get_sys_path(event
->udev
));
417 dbg(event
->udev
, "missing attribute\n");
420 struct udev_list_entry
*list_entry
;
423 list_entry
= udev_device_get_properties_list_entry(event
->dev
);
424 list_entry
= udev_list_entry_get_by_name(list_entry
, attr
);
425 if (list_entry
== NULL
)
427 value
= udev_list_entry_get_value(list_entry
);
428 dbg(event
->udev
, "substitute env '%s=%s'\n", attr
, value
);
429 util_strlcat(string
, value
, maxsize
);
433 err(event
->udev
, "unknown substitution type=%i\n", type
);
436 /* possibly truncate to format-char specified length */
437 if (len
>= 0 && len
< (int)strlen(head
)) {
439 dbg(event
->udev
, "truncate to %i chars, subtitution string becomes '%s'\n", len
, head
);
441 util_strlcat(string
, temp
, maxsize
);
445 static void rename_netif_kernel_log(struct ifreq ifr
)
450 klog
= open("/dev/kmsg", O_WRONLY
);
454 f
= fdopen(klog
, "w");
460 fprintf(f
, "<6>udev: renamed network interface %s to %s\n",
461 ifr
.ifr_name
, ifr
.ifr_newname
);
465 static int rename_netif(struct udev_event
*event
)
467 struct udev_device
*dev
= event
->dev
;
472 info(event
->udev
, "changing net interface name from '%s' to '%s'\n",
473 udev_device_get_sysname(dev
), event
->name
);
477 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
479 err(event
->udev
, "error opening socket: %m\n");
483 memset(&ifr
, 0x00, sizeof(struct ifreq
));
484 util_strlcpy(ifr
.ifr_name
, udev_device_get_sysname(dev
), IFNAMSIZ
);
485 util_strlcpy(ifr
.ifr_newname
, event
->name
, IFNAMSIZ
);
486 err
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
488 rename_netif_kernel_log(ifr
);
492 /* see if the destination interface name already exists */
493 if (errno
!= EEXIST
) {
494 err(event
->udev
, "error changing netif name %s to %s: %m\n",
495 ifr
.ifr_name
, ifr
.ifr_newname
);
499 /* free our own name, another process may wait for us */
500 util_strlcpy(ifr
.ifr_newname
, udev_device_get_sysname(dev
), IFNAMSIZ
);
501 util_strlcat(ifr
.ifr_newname
, "_rename", IFNAMSIZ
);
502 err
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
504 err(event
->udev
, "error changing netif name %s to %s: %m\n",
505 ifr
.ifr_name
, ifr
.ifr_newname
);
509 /* wait 30 seconds for our target to become available */
510 util_strlcpy(ifr
.ifr_name
, ifr
.ifr_newname
, IFNAMSIZ
);
511 util_strlcpy(ifr
.ifr_newname
, udev_device_get_devnode(dev
), IFNAMSIZ
);
514 err
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
516 rename_netif_kernel_log(ifr
);
520 if (errno
!= EEXIST
) {
521 err(event
->udev
, "error changing net interface name %s to %s: %m\n",
522 ifr
.ifr_name
, ifr
.ifr_newname
);
525 dbg(event
->udev
, "wait for netif '%s' to become free, loop=%i\n",
526 udev_device_get_devnode(dev
), (30 * 20) - loop
);
527 usleep(1000 * 1000 / 20);
535 int udev_event_execute_rules(struct udev_event
*event
, struct udev_rules
*rules
)
537 struct udev_device
*dev
= event
->dev
;
540 if (udev_device_get_devpath_old(dev
) != NULL
) {
541 if (udev_device_rename_db(dev
, udev_device_get_devpath(dev
)) == 0)
542 info(event
->udev
, "moved database from '%s' to '%s'\n",
543 udev_device_get_devpath_old(dev
), udev_device_get_devpath(dev
));
546 /* add device node */
547 if (major(udev_device_get_devnum(dev
)) != 0 &&
548 (strcmp(udev_device_get_action(dev
), "add") == 0 || strcmp(udev_device_get_action(dev
), "change") == 0)) {
549 char filename
[UTIL_PATH_SIZE
];
550 struct udev_device
*dev_old
;
552 dbg(event
->udev
, "device node add '%s'\n", udev_device_get_devpath(dev
));
554 udev_rules_apply_to_event(rules
, event
);
555 if (event
->tmp_node
!= NULL
) {
556 dbg(event
->udev
, "removing temporary device node\n");
557 util_unlink_secure(event
->udev
, event
->tmp_node
);
558 free(event
->tmp_node
);
559 event
->tmp_node
= NULL
;
562 if (event
->ignore_device
) {
563 info(event
->udev
, "device event will be ignored\n");
567 if (event
->name
!= NULL
&& event
->name
[0] == '\0') {
568 info(event
->udev
, "device node creation supressed\n");
572 if (event
->name
== NULL
) {
573 info(event
->udev
, "no node name set, will use kernel name '%s'\n",
574 udev_device_get_sysname(event
->dev
));
575 event
->name
= strdup(udev_device_get_sysname(event
->dev
));
576 if (event
->name
== NULL
)
580 /* set device node name */
581 util_strlcpy(filename
, udev_get_dev_path(event
->udev
), sizeof(filename
));
582 util_strlcat(filename
, "/", sizeof(filename
));
583 util_strlcat(filename
, event
->name
, sizeof(filename
));
584 udev_device_set_devnode(dev
, filename
);
586 /* read current database entry */
587 dev_old
= udev_device_new_from_syspath(event
->udev
, udev_device_get_syspath(dev
));
588 if (dev_old
!= NULL
) {
589 udev_device_read_db(dev_old
);
590 udev_device_set_info_loaded(dev_old
);
593 /* update database, create node and symlinks */
594 udev_device_update_db(dev
);
595 err
= udev_node_add(dev
, event
->mode
, event
->uid
, event
->gid
, event
->test
);
597 /* remove/update possible left-over symlinks from old database entry */
598 if (dev_old
!= NULL
) {
599 udev_node_update_old_links(dev
, dev_old
, event
->test
);
600 udev_device_unref(dev_old
);
606 if (strcmp(udev_device_get_subsystem(dev
), "net") == 0 && strcmp(udev_device_get_action(dev
), "add") == 0) {
607 dbg(event
->udev
, "netif add '%s'\n", udev_device_get_devpath(dev
));
609 udev_rules_apply_to_event(rules
, event
);
610 if (event
->ignore_device
) {
611 info(event
->udev
, "device event will be ignored\n");
614 if (event
->name
== NULL
)
617 /* look if we want to change the name of the netif */
618 if (strcmp(event
->name
, udev_device_get_sysname(dev
)) != 0) {
619 char syspath
[UTIL_PATH_SIZE
];
622 err
= rename_netif(event
);
625 info(event
->udev
, "renamed netif to '%s'\n", event
->name
);
627 /* remember old name */
628 udev_device_add_property(dev
, "INTERFACE_OLD", udev_device_get_sysname(dev
));
630 /* now change the devpath, because the kernel device name has changed */
631 util_strlcpy(syspath
, udev_device_get_syspath(dev
), sizeof(syspath
));
632 pos
= strrchr(syspath
, '/');
635 util_strlcat(syspath
, event
->name
, sizeof(syspath
));
636 udev_device_set_syspath(event
->dev
, syspath
);
637 udev_device_add_property(dev
, "INTERFACE", udev_device_get_sysname(dev
));
638 info(event
->udev
, "changed devpath to '%s'\n", udev_device_get_devpath(dev
));
644 /* remove device node */
645 if (major(udev_device_get_devnum(dev
)) != 0 && strcmp(udev_device_get_action(dev
), "remove") == 0) {
646 /* import database entry and delete it */
647 udev_device_read_db(dev
);
648 udev_device_set_info_loaded(dev
);
649 udev_device_delete_db(dev
);
651 if (udev_device_get_devnode(dev
) == NULL
) {
652 char devnode
[UTIL_PATH_SIZE
];
654 info(event
->udev
, "'%s' not found in database, using kernel name '%s'\n",
655 udev_device_get_syspath(dev
), udev_device_get_sysname(dev
));
656 util_strlcpy(devnode
, udev_get_dev_path(event
->udev
), sizeof(devnode
));
657 util_strlcat(devnode
, "/", sizeof(devnode
));
658 util_strlcat(devnode
, udev_device_get_sysname(dev
), sizeof(devnode
));
659 udev_device_set_devnode(dev
, devnode
);
662 udev_rules_apply_to_event(rules
, event
);
663 if (event
->ignore_device
) {
664 info(event
->udev
, "device event will be ignored\n");
668 if (udev_device_get_ignore_remove(dev
)) {
669 info(event
->udev
, "ignore_remove for '%s'\n", udev_device_get_devnode(dev
));
673 err
= udev_node_remove(dev
, event
->test
);
677 /* default devices */
678 udev_rules_apply_to_event(rules
, event
);
679 if (event
->ignore_device
)
680 info(event
->udev
, "device event will be ignored\n");
685 int udev_event_execute_run(struct udev_event
*event
)
687 struct udev_list_entry
*list_entry
;
690 dbg(event
->udev
, "executing run list\n");
691 udev_list_entry_foreach(list_entry
, udev_list_get_entry(&event
->run_list
)) {
692 const char *cmd
= udev_list_entry_get_name(list_entry
);
694 if (strncmp(cmd
, "socket:", strlen("socket:")) == 0) {
695 struct udev_monitor
*monitor
;
697 monitor
= udev_monitor_new_from_socket(event
->udev
, &cmd
[strlen("socket:")]);
700 udev_monitor_send_device(monitor
, event
->dev
);
701 udev_monitor_unref(monitor
);
703 char program
[UTIL_PATH_SIZE
];
706 util_strlcpy(program
, cmd
, sizeof(program
));
707 udev_event_apply_format(event
, program
, sizeof(program
));
709 fprintf(stderr
, "run %s (%llu) '%s'\n",
710 udev_device_get_syspath(event
->dev
),
711 udev_device_get_seqnum(event
->dev
),
713 envp
= udev_device_get_properties_envp(event
->dev
);
714 if (util_run_program(event
->udev
, program
, envp
, NULL
, 0, NULL
) != 0) {
715 if (!udev_list_entry_get_flag(list_entry
))