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>
38 #include "libsysfs/sysfs/libsysfs.h"
40 #include "udev_version.h"
41 #include "udev_dbus.h"
42 #include "udev_selinux.h"
46 #include "klibc_fixups.h"
48 #define LOCAL_USER "$local"
51 * Right now the major/minor of a device is stored in a file called
53 * The number is stored as:
57 * The value is in decimal.
59 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
62 struct sysfs_attribute *attr = NULL;
64 attr = sysfs_get_classdev_attr(class_dev, "dev");
67 dbg("dev='%s'", attr->value);
69 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
71 dbg("found major=%d, minor=%d", udev->major, udev->minor);
78 static int create_path(char *file)
86 pos = strchr(p+1, '/');
88 pos = strchr(pos+1, '/');
92 if (stat(p, &stats)) {
93 retval = mkdir(p, 0755);
95 dbg("mkdir(%s) failed with error '%s'",
99 dbg("created '%s'", p);
106 static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
110 retval = mknod(filename, mode, makedev(major, minor));
112 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
113 filename, mode, major, minor, strerror(errno));
117 dbg("chmod(%s, %#o)", filename, mode);
118 retval = chmod(filename, mode);
120 dbg("chmod(%s, %#o) failed with error '%s'",
121 filename, mode, strerror(errno));
125 if (uid != 0 || gid != 0) {
126 dbg("chown(%s, %u, %u)", filename, uid, gid);
127 retval = chown(filename, uid, gid);
129 dbg("chown(%s, %u, %u) failed with error '%s'",
130 filename, uid, gid, strerror(errno));
138 /* get the local logged in user */
139 static void set_to_local_user(char *user)
144 strfieldcpymax(user, default_owner_str, OWNER_SIZE);
151 /* is this a user login ? */
152 if (u->ut_type != USER_PROCESS)
155 /* is this a local login ? */
156 if (strcmp(u->ut_host, ""))
159 if (u->ut_time > recent) {
161 strfieldcpymax(user, u->ut_user, OWNER_SIZE);
162 dbg("local user is '%s'", user);
169 /* Used to unlink existing files to ensure that our new file/symlink is created */
170 static int unlink_entry(char *filename)
175 if (lstat(filename, &stats) == 0) {
176 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
177 retval = unlink(filename);
179 dbg("unlink(%s) failed with error '%s'",
180 filename, strerror(errno));
187 static int create_node(struct udevice *dev, int fake)
189 char filename[NAME_SIZE];
190 char linkname[NAME_SIZE];
191 char linktarget[NAME_SIZE];
192 char partitionname[NAME_SIZE];
201 strfieldcpy(filename, udev_root);
202 strfieldcat(filename, dev->name);
206 dev->mode |= S_IFBLK;
210 dev->mode |= S_IFCHR;
213 dev->mode |= S_IFIFO;
216 dbg("unknown node type %c\n", dev->type);
220 /* create parent directories if needed */
221 if (strrchr(dev->name, '/'))
222 create_path(filename);
224 if (dev->owner[0] != '\0') {
226 unsigned long id = strtoul(dev->owner, &endptr, 10);
227 if (endptr[0] == '\0')
231 if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
232 set_to_local_user(dev->owner);
234 pw = getpwnam(dev->owner);
236 dbg("specified user unknown '%s'", dev->owner);
242 if (dev->group[0] != '\0') {
244 unsigned long id = strtoul(dev->group, &endptr, 10);
245 if (endptr[0] == '\0')
248 struct group *gr = getgrnam(dev->group);
250 dbg("specified group unknown '%s'", dev->group);
257 unlink_entry(filename);
258 info("creating device node '%s'", filename);
259 make_node(filename, dev->major, dev->minor, dev->mode, uid, gid);
261 info("creating device node '%s', major = '%d', minor = '%d', "
262 "mode = '%#o', uid = '%d', gid = '%d'", filename,
263 dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
266 /* create partitions if requested */
267 if (dev->partitions > 0) {
268 info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
270 for (i = 1; i <= dev->partitions; i++) {
271 strfieldcpy(partitionname, filename);
272 strintcat(partitionname, i);
273 unlink_entry(partitionname);
274 make_node(partitionname, dev->major,
275 dev->minor + i, dev->mode, uid, gid);
281 selinux_add_node(filename);
283 /* create symlink if requested */
284 foreach_strpart(dev->symlink, " ", pos, len) {
285 strfieldcpymax(linkname, pos, len+1);
286 strfieldcpy(filename, udev_root);
287 strfieldcat(filename, linkname);
288 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
290 if (strrchr(linkname, '/'))
291 create_path(filename);
293 /* optimize relative link */
294 linktarget[0] = '\0';
297 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
298 if (dev->name[i] == '/')
302 while (linkname[i] != '\0') {
303 if (linkname[i] == '/')
304 strfieldcat(linktarget, "../");
308 strfieldcat(linktarget, &dev->name[tail]);
311 unlink_entry(filename);
313 dbg("symlink(%s, %s)", linktarget, filename);
315 retval = symlink(linktarget, filename);
317 dbg("symlink(%s, %s) failed with error '%s'",
318 linktarget, filename, strerror(errno));
325 static struct sysfs_class_device *get_class_dev(char *device_name)
327 char dev_path[SYSFS_PATH_MAX];
328 struct sysfs_class_device *class_dev = NULL;
330 strfieldcpy(dev_path, sysfs_path);
331 strfieldcat(dev_path, device_name);
332 dbg("looking at '%s'", dev_path);
334 /* open up the sysfs class device for this thing... */
335 class_dev = sysfs_open_class_device_path(dev_path);
336 if (class_dev == NULL) {
337 dbg ("sysfs_open_class_device_path failed");
340 dbg("class_dev->name='%s'", class_dev->name);
346 /* wait for the "dev" file to show up in the directory in sysfs.
347 * If it doesn't happen in about 10 seconds, give up.
349 #define SECONDS_TO_WAIT_FOR_DEV 10
350 static int sleep_for_dev(char *path)
352 char filename[SYSFS_PATH_MAX + 6];
353 int loop = SECONDS_TO_WAIT_FOR_DEV;
356 strfieldcpy(filename, sysfs_path);
357 strfieldcat(filename, path);
358 strfieldcat(filename, "/dev");
363 dbg("looking for '%s'", filename);
364 retval = stat(filename, &buf);
368 /* sleep to give the kernel a chance to create the dev file */
376 int udev_add_device(char *path, char *subsystem, int fake)
378 struct sysfs_class_device *class_dev = NULL;
380 int retval = -EINVAL;
382 memset(&dev, 0x00, sizeof(dev));
384 /* for now, the block layer is the only place where block devices are */
385 if (strcmp(subsystem, "block") == 0)
390 retval = sleep_for_dev(path);
394 class_dev = get_class_dev(path);
395 if (class_dev == NULL)
398 retval = get_major_minor(class_dev, &dev);
400 dbg("get_major_minor failed");
404 retval = namedev_name_device(class_dev, &dev);
409 retval = udevdb_add_dev(path, &dev);
411 dbg("udevdb_add_dev failed, but we are going to try "
412 "to create the node anyway. But remove might not "
413 "work properly for this device.");
416 dbg("name='%s'", dev.name);
417 retval = create_node(&dev, fake);
419 if ((retval == 0) && (!fake))
420 sysbus_send_create(&dev, path);
424 sysfs_close_class_device(class_dev);