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"
54 * the major/minor of a device is stored in a file called "dev"
55 * The number is stored in decimal values in the format: M:m
57 static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
59 struct sysfs_attribute *attr = NULL;
61 attr = sysfs_get_classdev_attr(class_dev, "dev");
64 dbg("dev='%s'", attr->value);
66 if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
68 dbg("found major=%d, minor=%d", udev->major, udev->minor);
75 static int create_path(char *file)
83 pos = strchr(p+1, '/');
85 pos = strchr(pos+1, '/');
89 if (stat(p, &stats)) {
90 selinux_setfscreatecon(p, S_IFDIR);
91 retval = mkdir(p, 0755);
93 dbg("mkdir(%s) failed with error '%s'",
97 dbg("created '%s'", p);
99 selinux_setfilecon(p, S_IFDIR);
106 static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
111 if (stat(file, &stats) != 0)
114 /* preserve node with already correct numbers, to not change the inode number */
115 if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
116 (stats.st_rdev == makedev(major, minor))) {
117 dbg("preserve file '%s', cause it has correct dev_t", file);
118 selinux_setfilecon(file,stats.st_mode);
122 if (unlink(file) != 0)
123 dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
125 dbg("already present file '%s' unlinked", file);
128 selinux_setfscreatecon(file, mode);
129 retval = mknod(file, mode, makedev(major, minor));
131 dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
132 file, mode, major, minor, strerror(errno));
137 dbg("chmod(%s, %#o)", file, mode);
138 if (chmod(file, mode) != 0) {
139 dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
143 if (uid != 0 || gid != 0) {
144 dbg("chown(%s, %u, %u)", file, uid, gid);
145 if (chown(file, uid, gid) != 0) {
146 dbg("chown(%s, %u, %u) failed with error '%s'",
147 file, uid, gid, strerror(errno));
156 static int create_node(struct udevice *udev)
158 char filename[NAME_SIZE];
159 char linkname[NAME_SIZE];
160 char linktarget[NAME_SIZE];
161 char partitionname[NAME_SIZE];
169 strfieldcpy(filename, udev_root);
170 strfieldcat(filename, udev->name);
172 switch (udev->type) {
174 udev->mode |= S_IFBLK;
178 udev->mode |= S_IFCHR;
181 udev->mode |= S_IFIFO;
184 dbg("unknown node type %c\n", udev->type);
188 /* create parent directories if needed */
189 if (strrchr(udev->name, '/'))
190 create_path(filename);
192 if (udev->owner[0] != '\0') {
194 unsigned long id = strtoul(udev->owner, &endptr, 10);
195 if (endptr[0] == '\0')
200 pw = getpwnam(udev->owner);
202 dbg("specified user unknown '%s'", udev->owner);
208 if (udev->group[0] != '\0') {
210 unsigned long id = strtoul(udev->group, &endptr, 10);
211 if (endptr[0] == '\0')
214 struct group *gr = getgrnam(udev->group);
216 dbg("specified group unknown '%s'", udev->group);
222 if (!udev->test_run) {
223 info("creating device node '%s'", filename);
224 if (make_node(filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
227 info("creating device node '%s', major = '%d', minor = '%d', "
228 "mode = '%#o', uid = '%d', gid = '%d'", filename,
229 udev->major, udev->minor, (mode_t)udev->mode, uid, gid);
232 /* create all_partitions if requested */
233 if (udev->partitions > 0) {
234 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
235 if (!udev->test_run) {
236 for (i = 1; i <= udev->partitions; i++) {
237 strfieldcpy(partitionname, filename);
238 strintcat(partitionname, i);
239 make_node(partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
244 /* create symlink(s) if requested */
245 foreach_strpart(udev->symlink, " ", pos, len) {
246 strfieldcpymax(linkname, pos, len+1);
247 strfieldcpy(filename, udev_root);
248 strfieldcat(filename, linkname);
249 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
251 if (strrchr(linkname, '/'))
252 create_path(filename);
254 /* optimize relative link */
255 linktarget[0] = '\0';
258 while ((udev->name[i] == linkname[i]) && udev->name[i]) {
259 if (udev->name[i] == '/')
263 while (linkname[i] != '\0') {
264 if (linkname[i] == '/')
265 strfieldcat(linktarget, "../");
269 strfieldcat(linktarget, &udev->name[tail]);
271 dbg("symlink(%s, %s)", linktarget, filename);
272 if (!udev->test_run) {
273 selinux_setfscreatecon(filename, S_IFLNK);
275 if (symlink(linktarget, filename) != 0)
276 dbg("symlink(%s, %s) failed with error '%s'",
277 linktarget, filename, strerror(errno));
286 static int rename_net_if(struct udevice *udev)
292 dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
296 sk = socket(PF_INET, SOCK_DGRAM, 0);
298 dbg("error opening socket");
302 memset(&ifr, 0x00, sizeof(struct ifreq));
303 strfieldcpy(ifr.ifr_name, udev->kernel_name);
304 strfieldcpy(ifr.ifr_newname, udev->name);
306 retval = ioctl(sk, SIOCSIFNAME, &ifr);
308 dbg("error changing net interface name");
314 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
319 if (udev->type == 'b' || udev->type == 'c') {
320 retval = get_major_minor(class_dev, udev);
322 dbg("no dev-file found, do nothing");
327 if (namedev_name_device(udev, class_dev) != 0)
330 dbg("adding name='%s'", udev->name);
334 if (udev->type == 'b' || udev->type == 'c') {
335 retval = create_node(udev);
339 if (udevdb_add_dev(udev) != 0)
340 dbg("udevdb_add_dev failed, but we create the node anyway, "
341 "remove might not work for custom names");
343 /* use full path to the environment */
344 snprintf(udev->devname, NAME_SIZE-1, "%s%s", udev_root, udev->name);
346 } else if (udev->type == 'n') {
347 /* look if we want to change the name of the netif */
348 if (strcmp(udev->name, udev->kernel_name) != 0) {
349 retval = rename_net_if(udev);
353 /* we've changed the name, now fake the devpath,
354 * cause original kernel name sleeps with the fishes
355 * and we don't get any event from the kernel now
357 pos = strrchr(udev->devpath, '/');
360 strfieldcat(udev->devpath, udev->name);
361 setenv("DEVPATH", udev->devpath, 1);
364 /* use netif name for the environment */
365 strfieldcpy(udev->devname, udev->name);