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git.ipfire.org Git - thirdparty/systemd.git/blob - udev-add.c
6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <sys/ioctl.h>
36 #include <linux/sockios.h>
42 #include "libsysfs/sysfs/libsysfs.h"
45 #include "udev_version.h"
49 #include "klibc_fixups.h"
51 #define LOCAL_USER "$local"
56 * Right now the major/minor of a device is stored in a file called
58 * The number is stored as:
62 * The value is in decimal.
64 static int get_major_minor(struct sysfs_class_device
*class_dev
, struct udevice
*udev
)
66 struct sysfs_attribute
*attr
= NULL
;
68 attr
= sysfs_get_classdev_attr(class_dev
, "dev");
71 dbg("dev='%s'", attr
->value
);
73 if (sscanf(attr
->value
, "%u:%u", &udev
->major
, &udev
->minor
) != 2)
75 dbg("found major=%d, minor=%d", udev
->major
, udev
->minor
);
82 static int create_path(char *file
)
90 pos
= strchr(p
+1, '/');
92 pos
= strchr(pos
+1, '/');
96 if (stat(p
, &stats
)) {
97 selinux_setfscreatecon(p
, S_IFDIR
);
98 retval
= mkdir(p
, 0755);
100 dbg("mkdir(%s) failed with error '%s'",
104 dbg("created '%s'", p
);
106 selinux_setfilecon(p
, S_IFDIR
);
113 static int make_node(char *file
, int major
, int minor
, unsigned int mode
, uid_t uid
, gid_t gid
)
118 if (stat(file
, &stats
) != 0)
121 /* preserve node with already correct numbers, to not change the inode number */
122 if (((stats
.st_mode
& S_IFMT
) == S_IFBLK
|| (stats
.st_mode
& S_IFMT
) == S_IFCHR
) &&
123 (stats
.st_rdev
== makedev(major
, minor
))) {
124 dbg("preserve file '%s', cause it has correct dev_t", file
);
125 selinux_setfilecon(file
,stats
.st_mode
);
129 if (unlink(file
) != 0)
130 dbg("unlink(%s) failed with error '%s'", file
, strerror(errno
));
132 dbg("already present file '%s' unlinked", file
);
135 selinux_setfscreatecon(file
, mode
);
136 retval
= mknod(file
, mode
, makedev(major
, minor
));
138 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
139 file
, mode
, major
, minor
, strerror(errno
));
144 dbg("chmod(%s, %#o)", file
, mode
);
145 if (chmod(file
, mode
) != 0) {
146 dbg("chmod(%s, %#o) failed with error '%s'", file
, mode
, strerror(errno
));
150 if (uid
!= 0 || gid
!= 0) {
151 dbg("chown(%s, %u, %u)", file
, uid
, gid
);
152 if (chown(file
, uid
, gid
) != 0) {
153 dbg("chown(%s, %u, %u) failed with error '%s'",
154 file
, uid
, gid
, strerror(errno
));
163 /* get the local logged in user */
164 static void set_to_local_user(char *user
)
169 strfieldcpymax(user
, default_owner_str
, OWNER_SIZE
);
176 /* is this a user login ? */
177 if (u
->ut_type
!= USER_PROCESS
)
180 /* is this a local login ? */
181 if (strcmp(u
->ut_host
, ""))
184 if (u
->ut_time
> recent
) {
186 strfieldcpymax(user
, u
->ut_user
, OWNER_SIZE
);
187 dbg("local user is '%s'", user
);
194 static int create_node(struct udevice
*dev
, int fake
)
196 char filename
[NAME_SIZE
];
197 char linkname
[NAME_SIZE
];
198 char linktarget
[NAME_SIZE
];
199 char partitionname
[NAME_SIZE
];
207 strfieldcpy(filename
, udev_root
);
208 strfieldcat(filename
, dev
->name
);
212 dev
->mode
|= S_IFBLK
;
216 dev
->mode
|= S_IFCHR
;
219 dev
->mode
|= S_IFIFO
;
222 dbg("unknown node type %c\n", dev
->type
);
226 /* create parent directories if needed */
227 if (strrchr(dev
->name
, '/'))
228 create_path(filename
);
230 if (dev
->owner
[0] != '\0') {
232 unsigned long id
= strtoul(dev
->owner
, &endptr
, 10);
233 if (endptr
[0] == '\0')
237 if (strncmp(dev
->owner
, LOCAL_USER
, sizeof(LOCAL_USER
)) == 0)
238 set_to_local_user(dev
->owner
);
240 pw
= getpwnam(dev
->owner
);
242 dbg("specified user unknown '%s'", dev
->owner
);
248 if (dev
->group
[0] != '\0') {
250 unsigned long id
= strtoul(dev
->group
, &endptr
, 10);
251 if (endptr
[0] == '\0')
254 struct group
*gr
= getgrnam(dev
->group
);
256 dbg("specified group unknown '%s'", dev
->group
);
263 info("creating device node '%s'", filename
);
264 if (make_node(filename
, dev
->major
, dev
->minor
, dev
->mode
, uid
, gid
) != 0)
267 info("creating device node '%s', major = '%d', minor = '%d', "
268 "mode = '%#o', uid = '%d', gid = '%d'", filename
,
269 dev
->major
, dev
->minor
, (mode_t
)dev
->mode
, uid
, gid
);
272 /* create all_partitions if requested */
273 if (dev
->partitions
> 0) {
274 info("creating device partition nodes '%s[1-%i]'", filename
, dev
->partitions
);
276 for (i
= 1; i
<= dev
->partitions
; i
++) {
277 strfieldcpy(partitionname
, filename
);
278 strintcat(partitionname
, i
);
279 make_node(partitionname
, dev
->major
,
280 dev
->minor
+ i
, dev
->mode
, uid
, gid
);
285 /* create symlink(s) if requested */
286 foreach_strpart(dev
->symlink
, " ", pos
, len
) {
287 strfieldcpymax(linkname
, pos
, len
+1);
288 strfieldcpy(filename
, udev_root
);
289 strfieldcat(filename
, linkname
);
290 dbg("symlink '%s' to node '%s' requested", filename
, dev
->name
);
292 if (strrchr(linkname
, '/'))
293 create_path(filename
);
295 /* optimize relative link */
296 linktarget
[0] = '\0';
299 while ((dev
->name
[i
] == linkname
[i
]) && dev
->name
[i
]) {
300 if (dev
->name
[i
] == '/')
304 while (linkname
[i
] != '\0') {
305 if (linkname
[i
] == '/')
306 strfieldcat(linktarget
, "../");
310 strfieldcat(linktarget
, &dev
->name
[tail
]);
312 dbg("symlink(%s, %s)", linktarget
, filename
);
314 selinux_setfscreatecon(filename
, S_IFLNK
);
316 if (symlink(linktarget
, filename
) != 0)
317 dbg("symlink(%s, %s) failed with error '%s'",
318 linktarget
, filename
, strerror(errno
));
327 static struct sysfs_class_device
*get_class_dev(const char *device_name
)
329 char dev_path
[SYSFS_PATH_MAX
];
330 struct sysfs_class_device
*class_dev
= NULL
;
332 strfieldcpy(dev_path
, sysfs_path
);
333 strfieldcat(dev_path
, device_name
);
334 dbg("looking at '%s'", dev_path
);
336 /* open up the sysfs class device for this thing... */
337 class_dev
= sysfs_open_class_device_path(dev_path
);
338 if (class_dev
== NULL
) {
339 dbg ("sysfs_open_class_device_path failed");
342 dbg("class_dev->name='%s'", class_dev
->name
);
348 /* wait for the "dev" file to show up in the directory in sysfs.
349 * If it doesn't happen in about 10 seconds, give up.
351 #define SECONDS_TO_WAIT_FOR_FILE 10
352 static int sleep_for_file(const char *path
, char* file
)
354 char filename
[SYSFS_PATH_MAX
+ 6];
355 int loop
= SECONDS_TO_WAIT_FOR_FILE
;
358 strfieldcpy(filename
, sysfs_path
);
359 strfieldcat(filename
, path
);
360 strfieldcat(filename
, file
);
365 dbg("looking for '%s'", filename
);
366 retval
= stat(filename
, &buf
);
370 /* sleep to give the kernel a chance to create the dev file */
378 static int rename_net_if(struct udevice
*dev
, int fake
)
384 dbg("changing net interface name from '%s' to '%s'", dev
->kernel_name
, dev
->name
);
388 sk
= socket(PF_INET
, SOCK_DGRAM
, 0);
390 dbg("error opening socket");
394 memset(&ifr
, 0x00, sizeof(struct ifreq
));
395 strfieldcpy(ifr
.ifr_name
, dev
->kernel_name
);
396 strfieldcpy(ifr
.ifr_newname
, dev
->name
);
398 retval
= ioctl(sk
, SIOCSIFNAME
, &ifr
);
400 dbg("error changing net interface name");
406 int udev_add_device(const char *path
, const char *subsystem
, int fake
)
408 struct sysfs_class_device
*class_dev
;
410 char devpath
[DEVPATH_SIZE
];
414 memset(&dev
, 0x00, sizeof(dev
));
416 dev
.type
= get_device_type(path
, subsystem
);
420 retval
= sleep_for_file(path
, "/dev");
424 retval
= sleep_for_file(path
, "/address");
428 dbg("unknown device type '%c'", dev
.type
);
432 class_dev
= get_class_dev(path
);
433 if (class_dev
== NULL
)
436 if (dev
.type
== 'b' || dev
.type
== 'c') {
437 retval
= get_major_minor(class_dev
, &dev
);
439 dbg("get_major_minor failed");
444 if (namedev_name_device(class_dev
, &dev
) != 0)
447 dbg("name='%s'", dev
.name
);
453 retval
= create_node(&dev
, fake
);
456 if ((!fake
) && (udevdb_add_dev(path
, &dev
) != 0))
457 dbg("udevdb_add_dev failed, but we are going to try "
458 "to create the node anyway. But remove might not "
459 "work properly for this device.");
461 dev_d_send(&dev
, subsystem
, path
);
465 strfieldcpy(devpath
, path
);
466 if (strcmp(dev
.name
, dev
.kernel_name
) != 0) {
467 retval
= rename_net_if(&dev
, fake
);
470 /* netif's are keyed with the configured name, cause
471 * the original kernel name sleeps with the fishes
473 pos
= strrchr(devpath
, '/');
476 strfieldcat(devpath
, dev
.name
);
479 if ((!fake
) && (udevdb_add_dev(devpath
, &dev
) != 0))
480 dbg("udevdb_add_dev failed");
482 dev_d_send(&dev
, subsystem
, devpath
);
488 sysfs_close_class_device(class_dev
);