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>
38 #include "libsysfs/sysfs/libsysfs.h"
39 #include "udev_libc_wrapper.h"
41 #include "udev_utils.h"
42 #include "udev_sysfs.h"
43 #include "udev_version.h"
45 #include "udev_rules.h"
47 #include "udev_selinux.h"
50 int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
55 if (stat(file, &stats) != 0)
58 /* preserve node with already correct numbers, to not change the inode number */
59 if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
60 (stats.st_rdev == devt)) {
61 info("preserve file '%s', cause it has correct dev_t", file);
62 selinux_setfilecon(file, udev->kernel_name, stats.st_mode);
66 if (unlink(file) != 0)
67 dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
69 dbg("already present file '%s' unlinked", file);
80 dbg("unknown node type %c\n", udev->type);
84 selinux_setfscreatecon(file, udev->kernel_name, mode);
85 retval = mknod(file, mode, devt);
86 selinux_resetfscreatecon();
88 err("mknod(%s, %#o, %u, %u) failed with error '%s'",
89 file, mode, major(devt), minor(devt), strerror(errno));
94 dbg("chmod(%s, %#o)", file, mode);
95 if (chmod(file, mode) != 0) {
96 dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
100 if (uid != 0 || gid != 0) {
101 dbg("chown(%s, %u, %u)", file, uid, gid);
102 if (chown(file, uid, gid) != 0) {
103 dbg("chown(%s, %u, %u) failed with error '%s'",
104 file, uid, gid, strerror(errno));
113 static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev)
115 char filename[PATH_SIZE];
116 char partitionname[PATH_SIZE];
117 struct name_entry *name_loop;
123 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
124 filename[sizeof(filename)-1] = '\0';
126 /* create parent directories if needed */
127 if (strchr(udev->name, '/'))
128 create_path(filename);
130 if (strcmp(udev->owner, "root") == 0)
136 id = strtoul(udev->owner, &endptr, 10);
137 if (endptr[0] == '\0')
140 uid = lookup_user(udev->owner);
143 if (strcmp(udev->group, "root") == 0)
149 id = strtoul(udev->group, &endptr, 10);
150 if (endptr[0] == '\0')
153 gid = lookup_group(udev->group);
156 if (!udev->test_run) {
157 info("creating device node '%s'", filename);
158 if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
161 info("creating device node '%s', major = '%d', minor = '%d', "
162 "mode = '%#o', uid = '%d', gid = '%d'", filename,
163 major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
166 /* create all_partitions if requested */
167 if (udev->partitions) {
168 struct sysfs_attribute *attr;
171 /* take the maximum registered minor range */
172 attr = sysfs_get_classdev_attr(class_dev, "range");
174 range = atoi(attr->value);
176 udev->partitions = range-1;
178 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
179 if (!udev->test_run) {
180 for (i = 1; i <= udev->partitions; i++) {
183 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
184 partitionname[sizeof(partitionname)-1] = '\0';
185 part_devt = makedev(major(udev->devt), minor(udev->devt)+1);
186 udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
191 /* create symlink(s) if requested */
192 list_for_each_entry(name_loop, &udev->symlink_list, node) {
194 char linktarget[PATH_SIZE];
196 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
197 filename[sizeof(filename)-1] = '\0';
199 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
201 if (strchr(filename, '/'))
202 create_path(filename);
204 /* optimize relative link */
205 linktarget[0] = '\0';
208 while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
209 if (udev->name[i] == '/')
213 while (name_loop->name[i] != '\0') {
214 if (name_loop->name[i] == '/')
215 strlcat(linktarget, "../", sizeof(linktarget));
219 strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
221 dbg("symlink(%s, %s)", linktarget, filename);
222 if (!udev->test_run) {
224 selinux_setfscreatecon(filename, udev->kernel_name, S_IFLNK);
225 retval = symlink(linktarget, filename);
226 selinux_resetfscreatecon();
228 dbg("symlink(%s, %s) failed with error '%s'",
229 linktarget, filename, strerror(errno));
238 static int rename_net_if(struct udevice *udev)
244 info("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
248 sk = socket(PF_INET, SOCK_DGRAM, 0);
250 dbg("error opening socket");
254 memset(&ifr, 0x00, sizeof(struct ifreq));
255 strlcpy(ifr.ifr_name, udev->kernel_name, IFNAMSIZ);
256 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
258 retval = ioctl(sk, SIOCSIFNAME, &ifr);
260 dbg("error changing net interface name");
266 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
271 if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
272 udev->devt = get_devt(class_dev);
274 dbg("no dev-file found, do nothing");
279 if (udev_rules_get_name(udev, class_dev) != 0)
282 dbg("adding name='%s'", udev->name);
286 if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
287 retval = create_node(udev, class_dev);
291 if (udev_db_add_device(udev) != 0)
292 dbg("udev_db_add_dev failed, but we create the node anyway, "
293 "remove might not work for custom names");
295 /* use full path to the environment */
296 snprintf(udev->devname, sizeof(udev->devname), "%s/%s", udev_root, udev->name);
297 udev->devname[sizeof(udev->devname)-1] = '\0';
299 } else if (udev->type == DEV_NET) {
300 /* look if we want to change the name of the netif */
301 if (strcmp(udev->name, udev->kernel_name) != 0) {
302 retval = rename_net_if(udev);
306 /* we've changed the name, now fake the devpath, cause the
307 * original kernel name sleeps with the fishes and we don't
308 * get an event from the kernel with the new name
310 pos = strrchr(udev->devpath, '/');
313 strlcat(udev->devpath, udev->name, sizeof(udev->devpath));
314 setenv("DEVPATH", udev->devpath, 1);
315 setenv("INTERFACE", udev->name, 1);
318 /* use netif name for the environment */
319 strlcpy(udev->devname, udev->name, sizeof(udev->devname));