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.
29 #include <sys/types.h>
32 #include <sys/socket.h>
33 #include <sys/ioctl.h>
34 #include <linux/sockios.h>
36 #include "libsysfs/sysfs/libsysfs.h"
37 #include "udev_libc_wrapper.h"
39 #include "udev_utils.h"
40 #include "udev_version.h"
42 #include "udev_rules.h"
43 #include "udev_selinux.h"
46 int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
59 dbg("unknown node type %c\n", udev->type);
63 if (stat(file, &stats) != 0)
66 /* preserve node with already correct numbers, to not change the inode number */
67 if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
68 info("preserve file '%s', cause it has correct dev_t", file);
69 selinux_setfilecon(file, udev->kernel_name, stats.st_mode);
73 if (unlink(file) != 0)
74 err("unlink(%s) failed: %s", file, strerror(errno));
76 dbg("already present file '%s' unlinked", file);
79 selinux_setfscreatecon(file, udev->kernel_name, mode);
80 retval = mknod(file, mode, devt);
81 selinux_resetfscreatecon();
83 err("mknod(%s, %#o, %u, %u) failed: %s",
84 file, mode, major(devt), minor(devt), strerror(errno));
89 dbg("chmod(%s, %#o)", file, mode);
90 if (chmod(file, mode) != 0) {
91 err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
95 if (uid != 0 || gid != 0) {
96 dbg("chown(%s, %u, %u)", file, uid, gid);
97 if (chown(file, uid, gid) != 0) {
98 err("chown(%s, %u, %u) failed: %s",
99 file, uid, gid, strerror(errno));
108 static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev)
110 char filename[PATH_SIZE];
111 struct name_entry *name_loop;
117 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
118 filename[sizeof(filename)-1] = '\0';
120 /* create parent directories if needed */
121 if (strchr(udev->name, '/'))
122 create_path(filename);
124 if (strcmp(udev->owner, "root") == 0)
130 id = strtoul(udev->owner, &endptr, 10);
131 if (endptr[0] == '\0')
134 uid = lookup_user(udev->owner);
137 if (strcmp(udev->group, "root") == 0)
143 id = strtoul(udev->group, &endptr, 10);
144 if (endptr[0] == '\0')
147 gid = lookup_group(udev->group);
150 if (!udev->test_run) {
151 info("creating device node '%s'", filename);
152 if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
154 setenv("DEVNAME", filename, 1);
156 info("creating device node '%s', major = '%d', minor = '%d', "
157 "mode = '%#o', uid = '%d', gid = '%d'", filename,
158 major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
161 /* create all_partitions if requested */
162 if (udev->partitions) {
163 char partitionname[PATH_SIZE];
164 struct sysfs_attribute *attr;
167 /* take the maximum registered minor range */
168 attr = sysfs_get_classdev_attr(class_dev, "range");
170 range = atoi(attr->value);
172 udev->partitions = range-1;
174 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
175 if (!udev->test_run) {
176 for (i = 1; i <= udev->partitions; i++) {
179 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
180 partitionname[sizeof(partitionname)-1] = '\0';
181 part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
182 udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
187 /* create symlink(s) if requested */
188 if (!list_empty(&udev->symlink_list)) {
189 char symlinks[512] = "";
191 list_for_each_entry(name_loop, &udev->symlink_list, node) {
193 char linktarget[PATH_SIZE];
195 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
196 filename[sizeof(filename)-1] = '\0';
198 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
200 if (strchr(filename, '/'))
201 create_path(filename);
203 /* optimize relative link */
204 linktarget[0] = '\0';
207 while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
208 if (udev->name[i] == '/')
212 while (name_loop->name[i] != '\0') {
213 if (name_loop->name[i] == '/')
214 strlcat(linktarget, "../", sizeof(linktarget));
218 strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
220 info("creating symlink '%s' to '%s'", filename, linktarget);
221 if (!udev->test_run) {
223 selinux_setfscreatecon(filename, NULL, S_IFLNK);
224 retval = symlink(linktarget, filename);
225 selinux_resetfscreatecon();
227 err("symlink(%s, %s) failed: %s",
228 linktarget, filename, strerror(errno));
231 strlcat(symlinks, filename, sizeof(symlinks));
232 strlcat(symlinks, " ", sizeof(symlinks));
235 remove_trailing_chars(symlinks, ' ');
236 setenv("DEVLINKS", symlinks, 1);
244 static int rename_net_if(struct udevice *udev)
250 info("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
254 sk = socket(PF_INET, SOCK_DGRAM, 0);
256 err("error opening socket: %s", strerror(errno));
260 memset(&ifr, 0x00, sizeof(struct ifreq));
261 strlcpy(ifr.ifr_name, udev->kernel_name, IFNAMSIZ);
262 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
264 retval = ioctl(sk, SIOCSIFNAME, &ifr);
266 err("error changing net interface name: %s", strerror(errno));
272 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
277 dbg("adding name='%s'", udev->name);
280 if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
281 retval = create_node(udev, class_dev);
285 if (udev_db_add_device(udev) != 0)
286 dbg("udev_db_add_dev failed, remove might not work for custom names");
287 } else if (udev->type == DEV_NET) {
288 /* look if we want to change the name of the netif */
289 if (strcmp(udev->name, udev->kernel_name) != 0) {
290 retval = rename_net_if(udev);
294 info("renamed netif to '%s'", udev->name);
295 /* we've changed the name, now fake the devpath, cause the
296 * original kernel name sleeps with the fishes and we don't
297 * get an event from the kernel with the new name
299 pos = strrchr(udev->devpath, '/');
302 strlcat(udev->devpath, udev->name, sizeof(udev->devpath));
303 strlcpy(udev->kernel_name, udev->name, sizeof(udev->kernel_name));
304 setenv("DEVPATH", udev->devpath, 1);
305 setenv("INTERFACE", udev->name, 1);