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>
39 #include "libsysfs/sysfs/libsysfs.h"
41 #include "udev_utils.h"
42 #include "udev_version.h"
46 #include "udev_selinux.h"
49 * the major/minor of a device is stored in a file called "dev"
50 * The number is stored in decimal values in the format: M:m
52 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
54 struct sysfs_attribute *attr = NULL;
56 attr = sysfs_get_classdev_attr(class_dev, "dev");
59 dbg("dev='%s'", attr->value);
61 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
63 dbg("found major=%d, minor=%d", udev->major, udev->minor);
70 int udev_make_node(struct udevice *udev, const char *file, int major, int minor, mode_t mode, uid_t uid, gid_t gid)
75 if (stat(file, &stats) != 0)
78 /* preserve node with already correct numbers, to not change the inode number */
79 if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
80 (stats.st_rdev == makedev(major, minor))) {
81 dbg("preserve file '%s', cause it has correct dev_t", file);
82 selinux_setfilecon(file, udev->kernel_name, stats.st_mode);
86 if (unlink(file) != 0)
87 dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
89 dbg("already present file '%s' unlinked", file);
92 selinux_setfscreatecon(file, udev->kernel_name, mode);
93 retval = mknod(file, mode, makedev(major, minor));
95 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
96 file, mode, major, minor, strerror(errno));
101 dbg("chmod(%s, %#o)", file, mode);
102 if (chmod(file, mode) != 0) {
103 dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
107 if (uid != 0 || gid != 0) {
108 dbg("chown(%s, %u, %u)", file, uid, gid);
109 if (chown(file, uid, gid) != 0) {
110 dbg("chown(%s, %u, %u) failed with error '%s'",
111 file, uid, gid, strerror(errno));
120 static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev)
122 char filename[NAME_SIZE];
123 char partitionname[NAME_SIZE];
131 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, udev->name);
132 filename[NAME_SIZE-1] = '\0';
134 switch (udev->type) {
136 udev->mode |= S_IFBLK;
140 udev->mode |= S_IFCHR;
143 udev->mode |= S_IFIFO;
146 dbg("unknown node type %c\n", udev->type);
150 /* create parent directories if needed */
151 if (strrchr(udev->name, '/'))
152 create_path(filename);
154 if (udev->owner[0] != '\0') {
156 unsigned long id = strtoul(udev->owner, &endptr, 10);
158 if (endptr[0] == '\0')
163 pw = getpwnam(udev->owner);
165 dbg("specified user unknown '%s'", udev->owner);
171 if (udev->group[0] != '\0') {
173 unsigned long id = strtoul(udev->group, &endptr, 10);
175 if (endptr[0] == '\0')
178 struct group *gr = getgrnam(udev->group);
180 dbg("specified group unknown '%s'", udev->group);
186 if (!udev->test_run) {
187 info("creating device node '%s'", filename);
188 if (udev_make_node(udev, filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
191 info("creating device node '%s', major = '%d', minor = '%d', "
192 "mode = '%#o', uid = '%d', gid = '%d'", filename,
193 udev->major, udev->minor, udev->mode, uid, gid);
196 /* create all_partitions if requested */
197 if (udev->partitions > 0) {
198 struct sysfs_attribute *attr;
201 /* take the maximum registered minor range */
202 attr = sysfs_get_classdev_attr(class_dev, "range");
204 range = atoi(attr->value);
206 udev->partitions = range-1;
208 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
209 if (!udev->test_run) {
210 for (i = 1; i <= udev->partitions; i++) {
211 strfieldcpy(partitionname, filename);
212 strintcat(partitionname, i);
213 udev_make_node(udev, partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
218 /* create symlink(s) if requested */
219 foreach_strpart(udev->symlink, " ", pos, len) {
220 char linkname[NAME_SIZE];
221 char linktarget[NAME_SIZE];
223 strfieldcpymax(linkname, pos, len+1);
224 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, linkname);
225 filename[NAME_SIZE-1] = '\0';
227 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
229 if (strrchr(linkname, '/'))
230 create_path(filename);
232 /* optimize relative link */
233 linktarget[0] = '\0';
236 while ((udev->name[i] == linkname[i]) && udev->name[i]) {
237 if (udev->name[i] == '/')
241 while (linkname[i] != '\0') {
242 if (linkname[i] == '/')
243 strfieldcat(linktarget, "../");
247 strfieldcat(linktarget, &udev->name[tail]);
249 dbg("symlink(%s, %s)", linktarget, filename);
250 if (!udev->test_run) {
251 selinux_setfscreatecon(filename, udev->kernel_name, S_IFLNK);
253 if (symlink(linktarget, filename) != 0)
254 dbg("symlink(%s, %s) failed with error '%s'",
255 linktarget, filename, strerror(errno));
264 static int rename_net_if(struct udevice *udev)
270 dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
274 sk = socket(PF_INET, SOCK_DGRAM, 0);
276 dbg("error opening socket");
280 memset(&ifr, 0x00, sizeof(struct ifreq));
281 strfieldcpy(ifr.ifr_name, udev->kernel_name);
282 strfieldcpy(ifr.ifr_newname, udev->name);
284 retval = ioctl(sk, SIOCSIFNAME, &ifr);
286 dbg("error changing net interface name");
292 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
297 if (udev->type == 'b' || udev->type == 'c') {
298 retval = get_major_minor(class_dev, udev);
300 dbg("no dev-file found, do nothing");
305 if (namedev_name_device(udev, class_dev) != 0)
308 dbg("adding name='%s'", udev->name);
312 if (udev->type == 'b' || udev->type == 'c') {
313 retval = create_node(udev, class_dev);
317 if (udev_db_add_device(udev) != 0)
318 dbg("udev_db_add_dev failed, but we create the node anyway, "
319 "remove might not work for custom names");
321 /* use full path to the environment */
322 snprintf(udev->devname, NAME_SIZE, "%s/%s", udev_root, udev->name);
323 udev->devname[NAME_SIZE-1] = '\0';
325 } else if (udev->type == 'n') {
326 /* look if we want to change the name of the netif */
327 if (strcmp(udev->name, udev->kernel_name) != 0) {
328 retval = rename_net_if(udev);
332 /* we've changed the name, now fake the devpath, cause the
333 * original kernel name sleeps with the fishes and we don't
334 * get an event from the kernel with the new name
336 pos = strrchr(udev->devpath, '/');
339 strfieldcat(udev->devpath, udev->name);
340 setenv("DEVPATH", udev->devpath, 1);
341 setenv("INTERFACE", udev->name, 1);
344 /* use netif name for the environment */
345 strfieldcpy(udev->devname, udev->name);