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);