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 static int make_node(struct udevice *udev, char *file, int major, int minor, unsigned int 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)
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);
157 if (endptr[0] == '\0')
162 pw = getpwnam(udev->owner);
164 dbg("specified user unknown '%s'", udev->owner);
170 if (udev->group[0] != '\0') {
172 unsigned long id = strtoul(udev->group, &endptr, 10);
173 if (endptr[0] == '\0')
176 struct group *gr = getgrnam(udev->group);
178 dbg("specified group unknown '%s'", udev->group);
184 if (!udev->test_run) {
185 info("creating device node '%s'", filename);
186 if (make_node(udev, filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
189 info("creating device node '%s', major = '%d', minor = '%d', "
190 "mode = '%#o', uid = '%d', gid = '%d'", filename,
191 udev->major, udev->minor, udev->mode, uid, gid);
194 /* create all_partitions if requested */
195 if (udev->partitions > 0) {
196 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
197 if (!udev->test_run) {
198 for (i = 1; i <= udev->partitions; i++) {
199 strfieldcpy(partitionname, filename);
200 strintcat(partitionname, i);
201 make_node(udev, partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
206 /* create symlink(s) if requested */
207 foreach_strpart(udev->symlink, " ", pos, len) {
208 char linkname[NAME_SIZE];
209 char linktarget[NAME_SIZE];
211 strfieldcpymax(linkname, pos, len+1);
212 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, linkname);
213 filename[NAME_SIZE-1] = '\0';
215 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
217 if (strrchr(linkname, '/'))
218 create_path(filename);
220 /* optimize relative link */
221 linktarget[0] = '\0';
224 while ((udev->name[i] == linkname[i]) && udev->name[i]) {
225 if (udev->name[i] == '/')
229 while (linkname[i] != '\0') {
230 if (linkname[i] == '/')
231 strfieldcat(linktarget, "../");
235 strfieldcat(linktarget, &udev->name[tail]);
237 dbg("symlink(%s, %s)", linktarget, filename);
238 if (!udev->test_run) {
239 selinux_setfscreatecon(filename, udev->kernel_name, S_IFLNK);
241 if (symlink(linktarget, filename) != 0)
242 dbg("symlink(%s, %s) failed with error '%s'",
243 linktarget, filename, strerror(errno));
252 static int rename_net_if(struct udevice *udev)
258 dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
262 sk = socket(PF_INET, SOCK_DGRAM, 0);
264 dbg("error opening socket");
268 memset(&ifr, 0x00, sizeof(struct ifreq));
269 strfieldcpy(ifr.ifr_name, udev->kernel_name);
270 strfieldcpy(ifr.ifr_newname, udev->name);
272 retval = ioctl(sk, SIOCSIFNAME, &ifr);
274 dbg("error changing net interface name");
280 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
285 if (udev->type == 'b' || udev->type == 'c') {
286 retval = get_major_minor(class_dev, udev);
288 dbg("no dev-file found, do nothing");
293 if (namedev_name_device(udev, class_dev) != 0)
296 dbg("adding name='%s'", udev->name);
300 if (udev->type == 'b' || udev->type == 'c') {
301 retval = create_node(udev);
305 if (udev_db_add_device(udev) != 0)
306 dbg("udev_db_add_dev failed, but we create the node anyway, "
307 "remove might not work for custom names");
309 /* use full path to the environment */
310 snprintf(udev->devname, NAME_SIZE, "%s/%s", udev_root, udev->name);
311 udev->devname[NAME_SIZE-1] = '\0';
313 } else if (udev->type == 'n') {
314 /* look if we want to change the name of the netif */
315 if (strcmp(udev->name, udev->kernel_name) != 0) {
316 retval = rename_net_if(udev);
320 /* we've changed the name, now fake the devpath, cause the
321 * original kernel name sleeps with the fishes and we don't
322 * get an event from the kernel with the new name
324 pos = strrchr(udev->devpath, '/');
327 strfieldcat(udev->devpath, udev->name);
328 setenv("DEVPATH", udev->devpath, 1);
329 setenv("INTERFACE", udev->name, 1);
332 /* use netif name for the environment */
333 strfieldcpy(udev->devname, udev->name);