]>
git.ipfire.org Git - thirdparty/systemd.git/blob - udev/udev-event.c
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: renamed network interface %s to %s\n",
458 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 (udev_device_get_sysname_old(dev
) != NULL
&&
538 strcmp(udev_device_get_sysname_old(dev
), udev_device_get_sysname(dev
)) != 0) {
539 udev_device_rename_db(dev
);
540 info(event
->udev
, "moved database from '%s:%s' to '%s:%s'\n",
541 udev_device_get_subsystem(dev
), udev_device_get_sysname_old(dev
),
542 udev_device_get_subsystem(dev
), udev_device_get_sysname(dev
));
545 if (strcmp(udev_device_get_action(dev
), "remove") == 0) {
546 udev_device_read_db(dev
);
547 udev_device_delete_db(dev
);
548 udev_device_tag_index(dev
, NULL
, false);
550 if (major(udev_device_get_devnum(dev
)) != 0)
551 udev_watch_end(event
->udev
, dev
);
553 udev_rules_apply_to_event(rules
, event
);
555 if (major(udev_device_get_devnum(dev
)) != 0)
556 err
= udev_node_remove(dev
);
558 event
->dev_db
= udev_device_new_from_syspath(event
->udev
, udev_device_get_syspath(dev
));
559 if (event
->dev_db
!= NULL
) {
560 udev_device_read_db(event
->dev_db
);
561 udev_device_set_info_loaded(event
->dev_db
);
563 /* disable watch during event processing */
564 if (major(udev_device_get_devnum(dev
)) != 0)
565 udev_watch_end(event
->udev
, event
->dev_db
);
568 udev_rules_apply_to_event(rules
, event
);
570 /* rename a new network interface, if needed */
571 if (strcmp(udev_device_get_subsystem(dev
), "net") == 0 && strcmp(udev_device_get_action(dev
), "add") == 0 &&
572 event
->name
!= NULL
&& strcmp(event
->name
, udev_device_get_sysname(dev
)) != 0) {
573 char syspath
[UTIL_PATH_SIZE
];
576 err
= rename_netif(event
);
578 info(event
->udev
, "renamed netif to '%s'\n", event
->name
);
580 /* delete stale db file */
581 udev_device_delete_db(dev
);
582 udev_device_tag_index(dev
, NULL
, false);
584 /* remember old name */
585 udev_device_add_property(dev
, "INTERFACE_OLD", udev_device_get_sysname(dev
));
587 /* now change the devpath, because the kernel device name has changed */
588 util_strscpy(syspath
, sizeof(syspath
), udev_device_get_syspath(dev
));
589 pos
= strrchr(syspath
, '/');
592 util_strscpy(pos
, sizeof(syspath
) - (pos
- syspath
), event
->name
);
593 udev_device_set_syspath(event
->dev
, syspath
);
594 udev_device_add_property(dev
, "INTERFACE", udev_device_get_sysname(dev
));
595 info(event
->udev
, "changed devpath to '%s'\n", udev_device_get_devpath(dev
));
600 if (major(udev_device_get_devnum(dev
)) != 0) {
601 char filename
[UTIL_PATH_SIZE
];
603 if (event
->tmp_node
!= NULL
) {
604 info(event
->udev
, "cleanup temporary device node\n");
605 util_unlink_secure(event
->udev
, event
->tmp_node
);
606 free(event
->tmp_node
);
607 event
->tmp_node
= NULL
;
610 /* no rule, use kernel provided name */
611 if (event
->name
== NULL
) {
612 if (udev_device_get_knodename(dev
) != NULL
) {
613 event
->name
= strdup(udev_device_get_knodename(dev
));
614 info(event
->udev
, "no node name set, will use kernel supplied name '%s'\n", event
->name
);
616 event
->name
= strdup(udev_device_get_sysname(event
->dev
));
617 info(event
->udev
, "no node name set, will use device name '%s'\n", event
->name
);
621 if (event
->name
== NULL
|| event
->name
[0] == '\0') {
622 udev_device_delete_db(dev
);
623 udev_device_tag_index(dev
, NULL
, false);
624 udev_device_unref(event
->dev_db
);
626 err(event
->udev
, "no node name, something went wrong, ignoring\n");
630 if (udev_device_get_knodename(dev
) != NULL
&& strcmp(udev_device_get_knodename(dev
), event
->name
) != 0)
631 err(event
->udev
, "kernel-provided name '%s' and NAME= '%s' disagree, "
632 "please use SYMLINK+= or change the kernel to provide the proper name\n",
633 udev_device_get_knodename(dev
), event
->name
);
635 /* set device node name */
636 util_strscpyl(filename
, sizeof(filename
), udev_get_dev_path(event
->udev
), "/", event
->name
, NULL
);
637 udev_device_set_devnode(dev
, filename
);
640 udev_device_update_db(dev
);
641 udev_device_tag_index(dev
, event
->dev_db
, true);
643 if (major(udev_device_get_devnum(dev
)) != 0) {
644 /* remove/update possible left-over symlinks from old database entry */
645 if (event
->dev_db
!= NULL
)
646 udev_node_update_old_links(dev
, event
->dev_db
);
648 /* change default 0600 to 0660 if a group is assigned */
649 if (event
->mode
== 0600 && event
->gid
> 0)
652 err
= udev_node_add(dev
, event
->mode
, event
->uid
, event
->gid
);
655 udev_device_unref(event
->dev_db
);
656 event
->dev_db
= NULL
;
662 int udev_event_execute_run(struct udev_event
*event
, const sigset_t
*sigmask
)
664 struct udev_list_entry
*list_entry
;
667 dbg(event
->udev
, "executing run list\n");
668 udev_list_entry_foreach(list_entry
, udev_list_get_entry(&event
->run_list
)) {
669 const char *cmd
= udev_list_entry_get_name(list_entry
);
671 if (strncmp(cmd
, "socket:", strlen("socket:")) == 0) {
672 struct udev_monitor
*monitor
;
674 monitor
= udev_monitor_new_from_socket(event
->udev
, &cmd
[strlen("socket:")]);
677 udev_monitor_send_device(monitor
, NULL
, event
->dev
);
678 udev_monitor_unref(monitor
);
680 char program
[UTIL_PATH_SIZE
];
683 udev_event_apply_format(event
, cmd
, program
, sizeof(program
));
684 envp
= udev_device_get_properties_envp(event
->dev
);
685 if (event
->exec_delay
> 0) {
686 info(event
->udev
, "delay execution of '%s'\n", program
);
687 sleep(event
->exec_delay
);
689 if (util_run_program(event
->udev
, program
, envp
, NULL
, 0, NULL
, sigmask
, true) != 0) {
690 if (udev_list_entry_get_flags(list_entry
))