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 strnfieldcpy(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 strfieldcpy(user, u->ut_user);
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)
190 char linktarget[255];
191 char partitionname[255];
200 strfieldcpy(filename, udev_root);
201 strfieldcat(filename, dev->name);
205 dev->mode |= S_IFBLK;
209 dev->mode |= S_IFCHR;
212 dev->mode |= S_IFIFO;
215 dbg("unknown node type %c\n", dev->type);
219 /* create parent directories if needed */
220 if (strrchr(dev->name, '/'))
221 create_path(filename);
223 if (dev->owner[0] != '\0') {
225 unsigned long id = strtoul(dev->owner, &endptr, 10);
226 if (endptr[0] == '\0')
229 if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
230 set_to_local_user(dev->owner);
232 struct passwd *pw = getpwnam(dev->owner);
234 dbg("specified user unknown '%s'", dev->owner);
240 if (dev->group[0] != '\0') {
242 unsigned long id = strtoul(dev->group, &endptr, 10);
243 if (endptr[0] == '\0')
246 struct group *gr = getgrnam(dev->group);
248 dbg("specified group unknown '%s'", dev->group);
255 unlink_entry(filename);
256 info("creating device node '%s'", filename);
257 make_node(filename, dev->major, dev->minor, dev->mode, uid, gid);
259 info("creating device node '%s', major = '%d', minor = '%d', "
260 "mode = '%#o', uid = '%d', gid = '%d'", filename,
261 dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
264 /* create partitions if requested */
265 if (dev->partitions > 0) {
266 info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
268 for (i = 1; i <= dev->partitions; i++) {
269 strfieldcpy(partitionname, filename);
270 strintcat(partitionname, i);
271 unlink_entry(partitionname);
272 make_node(partitionname, dev->major,
273 dev->minor + i, dev->mode, uid, gid);
279 selinux_add_node(filename);
281 /* create symlink if requested */
282 if (dev->symlink[0] != '\0') {
283 symlinks = dev->symlink;
285 linkname = strsep(&symlinks, " ");
286 if (linkname == NULL || linkname[0] == '\0')
289 strfieldcpy(filename, udev_root);
290 strfieldcat(filename, linkname);
291 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
293 if (strrchr(linkname, '/'))
294 create_path(filename);
296 /* optimize relative link */
297 linktarget[0] = '\0';
300 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
301 if (dev->name[i] == '/')
305 while (linkname[i] != '\0') {
306 if (linkname[i] == '/')
307 strfieldcat(linktarget, "../");
311 strfieldcat(linktarget, &dev->name[tail]);
314 unlink_entry(filename);
316 dbg("symlink(%s, %s)", linktarget, filename);
318 retval = symlink(linktarget, filename);
320 dbg("symlink(%s, %s) failed with error '%s'",
321 linktarget, filename, strerror(errno));
329 static struct sysfs_class_device *get_class_dev(char *device_name)
331 char dev_path[SYSFS_PATH_MAX];
332 struct sysfs_class_device *class_dev = NULL;
334 strfieldcpy(dev_path, sysfs_path);
335 strfieldcat(dev_path, device_name);
336 dbg("looking at '%s'", dev_path);
338 /* open up the sysfs class device for this thing... */
339 class_dev = sysfs_open_class_device_path(dev_path);
340 if (class_dev == NULL) {
341 dbg ("sysfs_open_class_device_path failed");
344 dbg("class_dev->name='%s'", class_dev->name);
350 /* wait for the "dev" file to show up in the directory in sysfs.
351 * If it doesn't happen in about 10 seconds, give up.
353 #define SECONDS_TO_WAIT_FOR_DEV 10
354 static int sleep_for_dev(char *path)
356 char filename[SYSFS_PATH_MAX + 6];
357 int loop = SECONDS_TO_WAIT_FOR_DEV;
360 strfieldcpy(filename, sysfs_path);
361 strfieldcat(filename, path);
362 strfieldcat(filename, "/dev");
367 dbg("looking for '%s'", filename);
368 retval = stat(filename, &buf);
372 /* sleep to give the kernel a chance to create the dev file */
380 int udev_add_device(char *path, char *subsystem, int fake)
382 struct sysfs_class_device *class_dev = NULL;
384 int retval = -EINVAL;
386 memset(&dev, 0x00, sizeof(dev));
388 /* for now, the block layer is the only place where block devices are */
389 if (strcmp(subsystem, "block") == 0)
394 retval = sleep_for_dev(path);
398 class_dev = get_class_dev(path);
399 if (class_dev == NULL)
402 retval = get_major_minor(class_dev, &dev);
404 dbg("get_major_minor failed");
408 retval = namedev_name_device(class_dev, &dev);
413 retval = udevdb_add_dev(path, &dev);
415 dbg("udevdb_add_dev failed, but we are going to try "
416 "to create the node anyway. But remove might not "
417 "work properly for this device.");
420 dbg("name='%s'", dev.name);
421 retval = create_node(&dev, fake);
423 if ((retval == 0) && (!fake))
424 sysbus_send_create(&dev, path);
428 sysfs_close_class_device(class_dev);