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"
42 #include "udev_version.h"
50 * the major/minor of a device is stored in a file called "dev"
51 * The number is stored in decimal values in the format: M:m
53 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
55 struct sysfs_attribute *attr = NULL;
57 attr = sysfs_get_classdev_attr(class_dev, "dev");
60 dbg("dev='%s'", attr->value);
62 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
64 dbg("found major=%d, minor=%d", udev->major, udev->minor);
71 static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
76 if (stat(file, &stats) != 0)
79 /* preserve node with already correct numbers, to not change the inode number */
80 if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
81 (stats.st_rdev == makedev(major, minor))) {
82 dbg("preserve file '%s', cause it has correct dev_t", file);
83 selinux_setfilecon(file,stats.st_mode);
87 if (unlink(file) != 0)
88 dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
90 dbg("already present file '%s' unlinked", file);
93 selinux_setfscreatecon(file, mode);
94 retval = mknod(file, mode, makedev(major, minor));
96 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
97 file, mode, major, minor, strerror(errno));
102 dbg("chmod(%s, %#o)", file, mode);
103 if (chmod(file, mode) != 0) {
104 dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
108 if (uid != 0 || gid != 0) {
109 dbg("chown(%s, %u, %u)", file, uid, gid);
110 if (chown(file, uid, gid) != 0) {
111 dbg("chown(%s, %u, %u) failed with error '%s'",
112 file, uid, gid, strerror(errno));
121 static int create_node(struct udevice *udev)
123 char filename[NAME_SIZE];
124 char partitionname[NAME_SIZE];
132 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, udev->name);
133 filename[NAME_SIZE-1] = '\0';
135 switch (udev->type) {
137 udev->mode |= S_IFBLK;
141 udev->mode |= S_IFCHR;
144 udev->mode |= S_IFIFO;
147 dbg("unknown node type %c\n", udev->type);
151 /* create parent directories if needed */
152 if (strrchr(udev->name, '/'))
153 create_path(filename);
155 if (udev->owner[0] != '\0') {
157 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);
174 if (endptr[0] == '\0')
177 struct group *gr = getgrnam(udev->group);
179 dbg("specified group unknown '%s'", udev->group);
185 if (!udev->test_run) {
186 info("creating device node '%s'", filename);
187 if (make_node(filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
190 info("creating device node '%s', major = '%d', minor = '%d', "
191 "mode = '%#o', uid = '%d', gid = '%d'", filename,
192 udev->major, udev->minor, (mode_t)udev->mode, uid, gid);
195 /* create all_partitions if requested */
196 if (udev->partitions > 0) {
197 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
198 if (!udev->test_run) {
199 for (i = 1; i <= udev->partitions; i++) {
200 strfieldcpy(partitionname, filename);
201 strintcat(partitionname, i);
202 make_node(partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
207 /* create symlink(s) if requested */
208 foreach_strpart(udev->symlink, " ", pos, len) {
209 char linkname[NAME_SIZE];
210 char linktarget[NAME_SIZE];
212 strfieldcpymax(linkname, pos, len+1);
213 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, linkname);
214 filename[NAME_SIZE-1] = '\0';
216 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
218 if (strrchr(linkname, '/'))
219 create_path(filename);
221 /* optimize relative link */
222 linktarget[0] = '\0';
225 while ((udev->name[i] == linkname[i]) && udev->name[i]) {
226 if (udev->name[i] == '/')
230 while (linkname[i] != '\0') {
231 if (linkname[i] == '/')
232 strfieldcat(linktarget, "../");
236 strfieldcat(linktarget, &udev->name[tail]);
238 dbg("symlink(%s, %s)", linktarget, filename);
239 if (!udev->test_run) {
240 selinux_setfscreatecon(filename, S_IFLNK);
242 if (symlink(linktarget, filename) != 0)
243 dbg("symlink(%s, %s) failed with error '%s'",
244 linktarget, filename, strerror(errno));
253 static int rename_net_if(struct udevice *udev)
259 dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
263 sk = socket(PF_INET, SOCK_DGRAM, 0);
265 dbg("error opening socket");
269 memset(&ifr, 0x00, sizeof(struct ifreq));
270 strfieldcpy(ifr.ifr_name, udev->kernel_name);
271 strfieldcpy(ifr.ifr_newname, udev->name);
273 retval = ioctl(sk, SIOCSIFNAME, &ifr);
275 dbg("error changing net interface name");
281 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
286 if (udev->type == 'b' || udev->type == 'c') {
287 retval = get_major_minor(class_dev, udev);
289 dbg("no dev-file found, do nothing");
294 if (namedev_name_device(udev, class_dev) != 0)
297 dbg("adding name='%s'", udev->name);
301 if (udev->type == 'b' || udev->type == 'c') {
302 retval = create_node(udev);
306 if (udev_db_add_device(udev) != 0)
307 dbg("udev_db_add_dev failed, but we create the node anyway, "
308 "remove might not work for custom names");
310 /* use full path to the environment */
311 snprintf(udev->devname, NAME_SIZE, "%s/%s", udev_root, udev->name);
312 udev->devname[NAME_SIZE-1] = '\0';
314 } else if (udev->type == 'n') {
315 /* look if we want to change the name of the netif */
316 if (strcmp(udev->name, udev->kernel_name) != 0) {
317 retval = rename_net_if(udev);
321 /* we've changed the name, now fake the devpath,
322 * cause original kernel name sleeps with the fishes
323 * and we don't get any event from the kernel now
325 pos = strrchr(udev->devpath, '/');
328 strfieldcat(udev->devpath, udev->name);
329 setenv("DEVPATH", udev->devpath, 1);
332 /* use netif name for the environment */
333 strfieldcpy(udev->devname, udev->name);