2 * udev-node.c - device node handling
4 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation version 2 of the License.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/types.h>
34 #include "udev_rules.h"
35 #include "udev_selinux.h"
38 int udev_node_mknod(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
43 if (major(devt) != 0 && strcmp(udev->dev->subsystem, "block") == 0)
48 if (stat(file, &stats) != 0)
51 /* preserve node with already correct numbers, to prevent changing the inode number */
52 if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
53 info("preserve file '%s', because it has correct dev_t", file);
54 selinux_setfilecon(file, udev->dev->kernel, stats.st_mode);
58 if (unlink(file) != 0)
59 err("unlink(%s) failed: %s", file, strerror(errno));
61 dbg("already present file '%s' unlinked", file);
64 selinux_setfscreatecon(file, udev->dev->kernel, mode);
65 retval = mknod(file, mode, devt);
66 selinux_resetfscreatecon();
68 err("mknod(%s, %#o, %u, %u) failed: %s",
69 file, mode, major(devt), minor(devt), strerror(errno));
74 dbg("chmod(%s, %#o)", file, mode);
75 if (chmod(file, mode) != 0) {
76 err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
80 if (uid != 0 || gid != 0) {
81 dbg("chown(%s, %u, %u)", file, uid, gid);
82 if (chown(file, uid, gid) != 0) {
83 err("chown(%s, %u, %u) failed: %s",
84 file, uid, gid, strerror(errno));
93 static int udev_node_symlink(struct udevice *udev, const char *linktarget, const char *filename)
95 char target[PATH_SIZE];
98 /* look if symlink already exists */
99 len = readlink(filename, target, sizeof(target));
102 if (strcmp(linktarget, target) == 0) {
103 info("preserving symlink '%s' to '%s'", filename, linktarget);
104 selinux_setfilecon(filename, NULL, S_IFLNK);
107 info("link '%s' points to different target '%s', delete it", filename, target);
113 info("creating symlink '%s' to '%s'", filename, linktarget);
114 selinux_setfscreatecon(filename, NULL, S_IFLNK);
115 if (symlink(linktarget, filename) != 0)
116 err("symlink(%s, %s) failed: %s", linktarget, filename, strerror(errno));
117 selinux_resetfscreatecon();
123 int udev_node_add(struct udevice *udev, struct udevice *udev_old)
125 char filename[PATH_SIZE];
126 struct name_entry *name_loop;
133 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
134 filename[sizeof(filename)-1] = '\0';
136 /* create parent directories if needed */
137 if (strchr(udev->name, '/'))
138 create_path(filename);
140 if (strcmp(udev->owner, "root") == 0)
146 id = strtoul(udev->owner, &endptr, 10);
147 if (endptr[0] == '\0')
150 uid = lookup_user(udev->owner);
153 if (strcmp(udev->group, "root") == 0)
159 id = strtoul(udev->group, &endptr, 10);
160 if (endptr[0] == '\0')
163 gid = lookup_group(udev->group);
166 info("creating device node '%s', major = '%d', minor = '%d', " "mode = '%#o', uid = '%d', gid = '%d'",
167 filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
170 if (udev_node_mknod(udev, filename, udev->devt, udev->mode, uid, gid) != 0) {
175 setenv("DEVNAME", filename, 1);
177 /* create all_partitions if requested */
178 if (udev->partitions) {
179 char partitionname[PATH_SIZE];
183 /* take the maximum registered minor range */
184 attr = sysfs_attr_get_value(udev->dev->devpath, "range");
188 udev->partitions = range-1;
190 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
191 if (!udev->test_run) {
192 for (i = 1; i <= udev->partitions; i++) {
195 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
196 partitionname[sizeof(partitionname)-1] = '\0';
197 part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
198 udev_node_mknod(udev, partitionname, part_devt, udev->mode, uid, gid);
203 /* create symlink(s) if requested */
204 if (!list_empty(&udev->symlink_list)) {
205 char symlinks[512] = "";
207 list_for_each_entry(name_loop, &udev->symlink_list, node) {
208 char linktarget[PATH_SIZE];
210 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
211 filename[sizeof(filename)-1] = '\0';
213 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
215 if (strchr(filename, '/'))
216 create_path(filename);
218 /* optimize relative link */
219 linktarget[0] = '\0';
222 while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
223 if (udev->name[i] == '/')
227 while (name_loop->name[i] != '\0') {
228 if (name_loop->name[i] == '/')
229 strlcat(linktarget, "../", sizeof(linktarget));
233 strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
235 info("creating symlink '%s' to '%s'", filename, linktarget);
237 udev_node_symlink(udev, linktarget, filename);
239 strlcat(symlinks, filename, sizeof(symlinks));
240 strlcat(symlinks, " ", sizeof(symlinks));
243 remove_trailing_chars(symlinks, ' ');
244 setenv("DEVLINKS", symlinks, 1);
252 void udev_node_remove_symlinks(struct udevice *udev)
254 char filename[PATH_SIZE];
255 struct name_entry *name_loop;
258 if (!list_empty(&udev->symlink_list)) {
259 char symlinks[512] = "";
261 list_for_each_entry(name_loop, &udev->symlink_list, node) {
262 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
263 filename[sizeof(filename)-1] = '\0';
265 if (stat(filename, &stats) != 0) {
266 dbg("symlink '%s' not found", filename);
269 if (udev->devt && stats.st_rdev != udev->devt) {
270 info("symlink '%s' points to a different device, skip removal", filename);
274 info("removing symlink '%s'", filename);
275 if (!udev->test_run) {
278 if (strchr(filename, '/'))
279 delete_path(filename);
282 strlcat(symlinks, filename, sizeof(symlinks));
283 strlcat(symlinks, " ", sizeof(symlinks));
286 remove_trailing_chars(symlinks, ' ');
287 if (symlinks[0] != '\0')
288 setenv("DEVLINKS", symlinks, 1);
292 int udev_node_remove(struct udevice *udev)
294 char filename[PATH_SIZE];
295 char partitionname[PATH_SIZE];
300 udev_node_remove_symlinks(udev);
302 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
303 filename[sizeof(filename)-1] = '\0';
305 if (stat(filename, &stats) != 0) {
306 dbg("device node '%s' not found", filename);
309 if (udev->devt && stats.st_rdev != udev->devt) {
310 info("device node '%s' points to a different device, skip removal", filename);
314 info("removing device node '%s'", filename);
315 retval = unlink_secure(filename);
319 setenv("DEVNAME", filename, 1);
321 num = udev->partitions;
325 info("removing all_partitions '%s[1-%i]'", filename, num);
327 info("garbage from udev database, skip all_partitions removal");
330 for (i = 1; i <= num; i++) {
331 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
332 partitionname[sizeof(partitionname)-1] = '\0';
333 unlink_secure(partitionname);
337 if (strchr(udev->name, '/'))
338 delete_path(filename);