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.
30 #include <sys/types.h>
33 #include <sys/ioctl.h>
34 #include <linux/sockios.h>
37 #include "udev_rules.h"
38 #include "udev_selinux.h"
41 int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
46 if (major(devt) != 0 && strcmp(udev->dev->subsystem, "block") == 0)
51 if (stat(file, &stats) != 0)
54 /* preserve node with already correct numbers, to prevent changing the inode number */
55 if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
56 info("preserve file '%s', cause it has correct dev_t", file);
57 selinux_setfilecon(file, udev->dev->kernel_name, stats.st_mode);
61 if (unlink(file) != 0)
62 err("unlink(%s) failed: %s", file, strerror(errno));
64 dbg("already present file '%s' unlinked", file);
67 selinux_setfscreatecon(file, udev->dev->kernel_name, mode);
68 retval = mknod(file, mode, devt);
69 selinux_resetfscreatecon();
71 err("mknod(%s, %#o, %u, %u) failed: %s",
72 file, mode, major(devt), minor(devt), strerror(errno));
77 dbg("chmod(%s, %#o)", file, mode);
78 if (chmod(file, mode) != 0) {
79 err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
83 if (uid != 0 || gid != 0) {
84 dbg("chown(%s, %u, %u)", file, uid, gid);
85 if (chown(file, uid, gid) != 0) {
86 err("chown(%s, %u, %u) failed: %s",
87 file, uid, gid, strerror(errno));
96 static int create_node(struct udevice *udev)
98 char filename[PATH_SIZE];
99 struct name_entry *name_loop;
105 snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
106 filename[sizeof(filename)-1] = '\0';
108 /* create parent directories if needed */
109 if (strchr(udev->name, '/'))
110 create_path(filename);
112 if (strcmp(udev->owner, "root") == 0)
118 id = strtoul(udev->owner, &endptr, 10);
119 if (endptr[0] == '\0')
122 uid = lookup_user(udev->owner);
125 if (strcmp(udev->group, "root") == 0)
131 id = strtoul(udev->group, &endptr, 10);
132 if (endptr[0] == '\0')
135 gid = lookup_group(udev->group);
138 info("creating device node '%s', major = '%d', minor = '%d', " "mode = '%#o', uid = '%d', gid = '%d'",
139 filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
142 if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
145 setenv("DEVNAME", filename, 1);
147 /* create all_partitions if requested */
148 if (udev->partitions) {
149 char partitionname[PATH_SIZE];
153 /* take the maximum registered minor range */
154 attr = sysfs_attr_get_value(udev->dev->devpath, "range");
158 udev->partitions = range-1;
160 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
161 if (!udev->test_run) {
162 for (i = 1; i <= udev->partitions; i++) {
165 snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
166 partitionname[sizeof(partitionname)-1] = '\0';
167 part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
168 udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
173 /* create symlink(s) if requested */
174 if (!list_empty(&udev->symlink_list)) {
175 char symlinks[512] = "";
177 list_for_each_entry(name_loop, &udev->symlink_list, node) {
179 char linktarget[PATH_SIZE];
181 snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
182 filename[sizeof(filename)-1] = '\0';
184 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
186 if (strchr(filename, '/'))
187 create_path(filename);
189 /* optimize relative link */
190 linktarget[0] = '\0';
193 while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
194 if (udev->name[i] == '/')
198 while (name_loop->name[i] != '\0') {
199 if (name_loop->name[i] == '/')
200 strlcat(linktarget, "../", sizeof(linktarget));
204 strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
206 info("creating symlink '%s' to '%s'", filename, linktarget);
207 if (!udev->test_run) {
209 selinux_setfscreatecon(filename, NULL, S_IFLNK);
210 retval = symlink(linktarget, filename);
211 selinux_resetfscreatecon();
213 err("symlink(%s, %s) failed: %s",
214 linktarget, filename, strerror(errno));
217 strlcat(symlinks, filename, sizeof(symlinks));
218 strlcat(symlinks, " ", sizeof(symlinks));
221 remove_trailing_chars(symlinks, ' ');
222 setenv("DEVLINKS", symlinks, 1);
230 static int rename_net_if(struct udevice *udev)
236 info("changing net interface name from '%s' to '%s'", udev->dev->kernel_name, udev->name);
240 sk = socket(PF_INET, SOCK_DGRAM, 0);
242 err("error opening socket: %s", strerror(errno));
246 memset(&ifr, 0x00, sizeof(struct ifreq));
247 strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
248 strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
250 retval = ioctl(sk, SIOCSIFNAME, &ifr);
252 err("error changing net interface name: %s", strerror(errno));
258 int udev_add_device(struct udevice *udev)
263 dbg("adding name='%s'", udev->name);
266 if (major(udev->devt)) {
267 retval = create_node(udev);
271 if (udev_db_add_device(udev) != 0)
272 dbg("udev_db_add_dev failed, remove might not work for custom names");
273 } else if (strcmp(udev->dev->subsystem, "net") == 0) {
274 /* look if we want to change the name of the netif */
275 if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
276 retval = rename_net_if(udev);
280 info("renamed netif to '%s'", udev->name);
281 /* we've changed the name, now fake the devpath, cause the
282 * original kernel name sleeps with the fishes and we don't
283 * get an event from the kernel with the new name
285 pos = strrchr(udev->dev->devpath, '/');
288 strlcat(udev->dev->devpath, udev->name, sizeof(udev->dev->devpath));
289 strlcpy(udev->dev->kernel_name, udev->name, sizeof(udev->dev->kernel_name));
290 setenv("DEVPATH", udev->dev->devpath, 1);
291 setenv("INTERFACE", udev->name, 1);