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"
41 #include "udev_version.h"
42 #include "udev_dbus.h"
43 #include "udev_selinux.h"
47 #include "klibc_fixups.h"
49 #define LOCAL_USER "$local"
52 * Right now the major/minor of a device is stored in a file called
54 * The number is stored as:
58 * The value is in decimal.
60 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
63 struct sysfs_attribute *attr = NULL;
65 attr = sysfs_get_classdev_attr(class_dev, "dev");
68 dbg("dev='%s'", attr->value);
70 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
72 dbg("found major=%d, minor=%d", udev->major, udev->minor);
79 static int create_path(char *file)
87 pos = strchr(p+1, '/');
89 pos = strchr(pos+1, '/');
93 if (stat(p, &stats)) {
94 retval = mkdir(p, 0755);
96 dbg("mkdir(%s) failed with error '%s'",
100 dbg("created '%s'", p);
107 static int make_node(char *filename, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
111 retval = mknod(filename, mode, makedev(major, minor));
113 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
114 filename, mode, major, minor, strerror(errno));
118 dbg("chmod(%s, %#o)", filename, mode);
119 retval = chmod(filename, mode);
121 dbg("chmod(%s, %#o) failed with error '%s'",
122 filename, mode, strerror(errno));
126 if (uid != 0 || gid != 0) {
127 dbg("chown(%s, %u, %u)", filename, uid, gid);
128 retval = chown(filename, uid, gid);
130 dbg("chown(%s, %u, %u) failed with error '%s'",
131 filename, uid, gid, strerror(errno));
139 /* get the local logged in user */
140 static void set_to_local_user(char *user)
145 strfieldcpymax(user, default_owner_str, OWNER_SIZE);
152 /* is this a user login ? */
153 if (u->ut_type != USER_PROCESS)
156 /* is this a local login ? */
157 if (strcmp(u->ut_host, ""))
160 if (u->ut_time > recent) {
162 strfieldcpymax(user, u->ut_user, OWNER_SIZE);
163 dbg("local user is '%s'", user);
170 /* Used to unlink existing files to ensure that our new file/symlink is created */
171 static int unlink_entry(char *filename)
176 if (lstat(filename, &stats) == 0) {
177 if ((stats.st_mode & S_IFMT) != S_IFDIR) {
178 retval = unlink(filename);
180 dbg("unlink(%s) failed with error '%s'",
181 filename, strerror(errno));
188 static int create_node(struct udevice *dev, int fake)
190 char filename[NAME_SIZE];
191 char linkname[NAME_SIZE];
192 char linktarget[NAME_SIZE];
193 char partitionname[NAME_SIZE];
202 strfieldcpy(filename, udev_root);
203 strfieldcat(filename, dev->name);
207 dev->mode |= S_IFBLK;
211 dev->mode |= S_IFCHR;
214 dev->mode |= S_IFIFO;
217 dbg("unknown node type %c\n", dev->type);
221 /* create parent directories if needed */
222 if (strrchr(dev->name, '/'))
223 create_path(filename);
225 if (dev->owner[0] != '\0') {
227 unsigned long id = strtoul(dev->owner, &endptr, 10);
228 if (endptr[0] == '\0')
232 if (strncmp(dev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
233 set_to_local_user(dev->owner);
235 pw = getpwnam(dev->owner);
237 dbg("specified user unknown '%s'", dev->owner);
243 if (dev->group[0] != '\0') {
245 unsigned long id = strtoul(dev->group, &endptr, 10);
246 if (endptr[0] == '\0')
249 struct group *gr = getgrnam(dev->group);
251 dbg("specified group unknown '%s'", dev->group);
258 unlink_entry(filename);
259 info("creating device node '%s'", filename);
260 make_node(filename, dev->major, dev->minor, dev->mode, uid, gid);
262 info("creating device node '%s', major = '%d', minor = '%d', "
263 "mode = '%#o', uid = '%d', gid = '%d'", filename,
264 dev->major, dev->minor, (mode_t)dev->mode, uid, gid);
267 /* create partitions if requested */
268 if (dev->partitions > 0) {
269 info("creating device partition nodes '%s[1-%i]'", filename, dev->partitions);
271 for (i = 1; i <= dev->partitions; i++) {
272 strfieldcpy(partitionname, filename);
273 strintcat(partitionname, i);
274 unlink_entry(partitionname);
275 make_node(partitionname, dev->major,
276 dev->minor + i, dev->mode, uid, gid);
282 selinux_add_node(filename);
284 /* create symlink if requested */
285 foreach_strpart(dev->symlink, " ", pos, len) {
286 strfieldcpymax(linkname, pos, len+1);
287 strfieldcpy(filename, udev_root);
288 strfieldcat(filename, linkname);
289 dbg("symlink '%s' to node '%s' requested", filename, dev->name);
291 if (strrchr(linkname, '/'))
292 create_path(filename);
294 /* optimize relative link */
295 linktarget[0] = '\0';
298 while ((dev->name[i] == linkname[i]) && dev->name[i]) {
299 if (dev->name[i] == '/')
303 while (linkname[i] != '\0') {
304 if (linkname[i] == '/')
305 strfieldcat(linktarget, "../");
309 strfieldcat(linktarget, &dev->name[tail]);
312 unlink_entry(filename);
314 dbg("symlink(%s, %s)", linktarget, filename);
316 retval = symlink(linktarget, filename);
318 dbg("symlink(%s, %s) failed with error '%s'",
319 linktarget, filename, strerror(errno));
326 static struct sysfs_class_device *get_class_dev(char *device_name)
328 char dev_path[SYSFS_PATH_MAX];
329 struct sysfs_class_device *class_dev = NULL;
331 strfieldcpy(dev_path, sysfs_path);
332 strfieldcat(dev_path, device_name);
333 dbg("looking at '%s'", dev_path);
335 /* open up the sysfs class device for this thing... */
336 class_dev = sysfs_open_class_device_path(dev_path);
337 if (class_dev == NULL) {
338 dbg ("sysfs_open_class_device_path failed");
341 dbg("class_dev->name='%s'", class_dev->name);
347 /* wait for the "dev" file to show up in the directory in sysfs.
348 * If it doesn't happen in about 10 seconds, give up.
350 #define SECONDS_TO_WAIT_FOR_DEV 10
351 static int sleep_for_dev(char *path)
353 char filename[SYSFS_PATH_MAX + 6];
354 int loop = SECONDS_TO_WAIT_FOR_DEV;
357 strfieldcpy(filename, sysfs_path);
358 strfieldcat(filename, path);
359 strfieldcat(filename, "/dev");
364 dbg("looking for '%s'", filename);
365 retval = stat(filename, &buf);
369 /* sleep to give the kernel a chance to create the dev file */
377 int udev_add_device(char *path, char *subsystem, int fake)
379 struct sysfs_class_device *class_dev = NULL;
381 int retval = -EINVAL;
383 memset(&dev, 0x00, sizeof(dev));
385 /* for now, the block layer is the only place where block devices are */
386 if (strcmp(subsystem, "block") == 0)
391 retval = sleep_for_dev(path);
395 class_dev = get_class_dev(path);
396 if (class_dev == NULL)
399 retval = get_major_minor(class_dev, &dev);
401 dbg("get_major_minor failed");
405 retval = namedev_name_device(class_dev, &dev);
410 retval = udevdb_add_dev(path, &dev);
412 dbg("udevdb_add_dev failed, but we are going to try "
413 "to create the node anyway. But remove might not "
414 "work properly for this device.");
417 dbg("name='%s'", dev.name);
418 retval = create_node(&dev, fake);
420 if ((retval == 0) && (!fake))
421 sysbus_send_create(&dev, path);
425 sysfs_close_class_device(class_dev);