4 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation version 2 of the License.
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <sys/ioctl.h>
35 #include <linux/sockios.h>
38 #include "udev_rules.h"
39 #include "udev_selinux.h"
42 int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
47 if (major(devt) != 0 && strcmp(udev->dev->subsystem, "block") == 0)
52 if (stat(file, &stats) != 0)
55 /* preserve node with already correct numbers, to prevent changing the inode number */
56 if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
57 info("preserve file '%s', cause it has correct dev_t", file);
58 selinux_setfilecon(file, udev->dev->kernel_name, stats.st_mode);
62 if (unlink(file) != 0)
63 err("unlink(%s) failed: %s", file, strerror(errno));
65 dbg("already present file '%s' unlinked", file);
68 selinux_setfscreatecon(file, udev->dev->kernel_name, mode);
69 retval = mknod(file, mode, devt);
70 selinux_resetfscreatecon();
72 err("mknod(%s, %#o, %u, %u) failed: %s",
73 file, mode, major(devt), minor(devt), strerror(errno));
78 dbg("chmod(%s, %#o)", file, mode);
79 if (chmod(file, mode) != 0) {
80 err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
84 if (uid != 0 || gid != 0) {
85 dbg("chown(%s, %u, %u)", file, uid, gid);
86 if (chown(file, uid, gid) != 0) {
87 err("chown(%s, %u, %u) failed: %s",
88 file, uid, gid, strerror(errno));
97 static int create_node(struct udevice *udev)
99 char filename[PATH_SIZE];
100 struct name_entry *name_loop;
106 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
107 filename[sizeof(filename)-1] = '\0';
109 /* create parent directories if needed */
110 if (strchr(udev->name, '/'))
111 create_path(filename);
113 if (strcmp(udev->owner, "root") == 0)
119 id = strtoul(udev->owner, &endptr, 10);
120 if (endptr[0] == '\0')
123 uid = lookup_user(udev->owner);
126 if (strcmp(udev->group, "root") == 0)
132 id = strtoul(udev->group, &endptr, 10);
133 if (endptr[0] == '\0')
136 gid = lookup_group(udev->group);
139 info("creating device node '%s', major = '%d', minor = '%d', " "mode = '%#o', uid = '%d', gid = '%d'",
140 filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
143 if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
146 setenv("DEVNAME", filename, 1);
148 /* create all_partitions if requested */
149 if (udev->partitions) {
150 char partitionname[PATH_SIZE];
154 /* take the maximum registered minor range */
155 attr = sysfs_attr_get_value(udev->dev->devpath, "range");
159 udev->partitions = range-1;
161 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
162 if (!udev->test_run) {
163 for (i = 1; i <= udev->partitions; i++) {
166 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
167 partitionname[sizeof(partitionname)-1] = '\0';
168 part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
169 udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
174 /* create symlink(s) if requested */
175 if (!list_empty(&udev->symlink_list)) {
176 char symlinks[512] = "";
178 list_for_each_entry(name_loop, &udev->symlink_list, node) {
180 char linktarget[PATH_SIZE];
182 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
183 filename[sizeof(filename)-1] = '\0';
185 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
187 if (strchr(filename, '/'))
188 create_path(filename);
190 /* optimize relative link */
191 linktarget[0] = '\0';
194 while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
195 if (udev->name[i] == '/')
199 while (name_loop->name[i] != '\0') {
200 if (name_loop->name[i] == '/')
201 strlcat(linktarget, "../", sizeof(linktarget));
205 strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
207 info("creating symlink '%s' to '%s'", filename, linktarget);
208 if (!udev->test_run) {
210 selinux_setfscreatecon(filename, NULL, S_IFLNK);
211 retval = symlink(linktarget, filename);
212 selinux_resetfscreatecon();
214 err("symlink(%s, %s) failed: %s",
215 linktarget, filename, strerror(errno));
218 strlcat(symlinks, filename, sizeof(symlinks));
219 strlcat(symlinks, " ", sizeof(symlinks));
222 remove_trailing_chars(symlinks, ' ');
223 setenv("DEVLINKS", symlinks, 1);
231 static int rename_net_if(struct udevice *udev)
237 info("changing net interface name from '%s' to '%s'", udev->dev->kernel_name, udev->name);
241 sk = socket(PF_INET, SOCK_DGRAM, 0);
243 err("error opening socket: %s", strerror(errno));
247 memset(&ifr, 0x00, sizeof(struct ifreq));
248 strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
249 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
251 retval = ioctl(sk, SIOCSIFNAME, &ifr);
253 err("error changing net interface name: %s", strerror(errno));
259 int udev_add_device(struct udevice *udev)
264 dbg("adding name='%s'", udev->name);
267 if (major(udev->devt)) {
268 retval = create_node(udev);
272 if (udev_db_add_device(udev) != 0)
273 dbg("udev_db_add_dev failed, remove might not work for custom names");
274 } else if (strcmp(udev->dev->subsystem, "net") == 0) {
275 /* look if we want to change the name of the netif */
276 if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
277 retval = rename_net_if(udev);
281 info("renamed netif to '%s'", udev->name);
282 /* we've changed the name, now fake the devpath, cause the
283 * original kernel name sleeps with the fishes and we don't
284 * get an event from the kernel with the new name
286 pos = strrchr(udev->dev->devpath, '/');
289 strlcat(udev->dev->devpath, udev->name, sizeof(udev->dev->devpath));
290 strlcpy(udev->dev->kernel_name, udev->name, sizeof(udev->dev->kernel_name));
291 setenv("DEVPATH", udev->dev->devpath, 1);
292 setenv("INTERFACE", udev->name, 1);