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_sysfs.h"
43 #include "udev_version.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 dbg("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 dbg("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[NAME_SIZE];
116 char partitionname[NAME_SIZE];
124 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, udev->name);
125 filename[NAME_SIZE-1] = '\0';
127 /* create parent directories if needed */
128 if (strchr(udev->name, '/'))
129 create_path(filename);
131 if (udev->owner[0] != '\0') {
133 unsigned long id = strtoul(udev->owner, &endptr, 10);
135 if (endptr[0] == '\0')
140 pw = getpwnam(udev->owner);
142 dbg("specified user unknown '%s'", udev->owner);
148 if (udev->group[0] != '\0') {
150 unsigned long id = strtoul(udev->group, &endptr, 10);
152 if (endptr[0] == '\0')
155 struct group *gr = getgrnam(udev->group);
157 dbg("specified group unknown '%s'", udev->group);
163 if (!udev->test_run) {
164 info("creating device node '%s'", filename);
165 if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
168 info("creating device node '%s', major = '%d', minor = '%d', "
169 "mode = '%#o', uid = '%d', gid = '%d'", filename,
170 major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
173 /* create all_partitions if requested */
174 if (udev->partitions) {
175 struct sysfs_attribute *attr;
178 /* take the maximum registered minor range */
179 attr = sysfs_get_classdev_attr(class_dev, "range");
181 range = atoi(attr->value);
183 udev->partitions = range-1;
185 info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
186 if (!udev->test_run) {
187 for (i = 1; i <= udev->partitions; i++) {
190 strfieldcpy(partitionname, filename);
191 strintcat(partitionname, i);
192 part_devt = makedev(major(udev->devt), minor(udev->devt)+1);
193 udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
198 /* create symlink(s) if requested */
199 foreach_strpart(udev->symlink, " ", pos, len) {
201 char linkname[NAME_SIZE];
202 char linktarget[NAME_SIZE];
204 strfieldcpymax(linkname, pos, len+1);
205 snprintf(filename, NAME_SIZE, "%s/%s", udev_root, linkname);
206 filename[NAME_SIZE-1] = '\0';
208 dbg("symlink '%s' to node '%s' requested", filename, udev->name);
210 if (strrchr(linkname, '/'))
211 create_path(filename);
213 /* optimize relative link */
214 linktarget[0] = '\0';
217 while ((udev->name[i] == linkname[i]) && udev->name[i]) {
218 if (udev->name[i] == '/')
222 while (linkname[i] != '\0') {
223 if (linkname[i] == '/')
224 strfieldcat(linktarget, "../");
228 strfieldcat(linktarget, &udev->name[tail]);
230 dbg("symlink(%s, %s)", linktarget, filename);
231 if (!udev->test_run) {
233 selinux_setfscreatecon(filename, udev->kernel_name, S_IFLNK);
234 retval = symlink(linktarget, filename);
235 selinux_resetfscreatecon();
237 dbg("symlink(%s, %s) failed with error '%s'",
238 linktarget, filename, strerror(errno));
247 static int rename_net_if(struct udevice *udev)
253 dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
257 sk = socket(PF_INET, SOCK_DGRAM, 0);
259 dbg("error opening socket");
263 memset(&ifr, 0x00, sizeof(struct ifreq));
264 strfieldcpy(ifr.ifr_name, udev->kernel_name);
265 strfieldcpy(ifr.ifr_newname, udev->name);
267 retval = ioctl(sk, SIOCSIFNAME, &ifr);
269 dbg("error changing net interface name");
275 int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
280 if (udev->type == BLOCK || udev->type == CLASS) {
281 udev->devt = get_devt(class_dev);
283 dbg("no dev-file found, do nothing");
288 if (namedev_name_device(udev, class_dev) != 0)
291 dbg("adding name='%s'", udev->name);
295 if (udev->type == BLOCK || udev->type == CLASS) {
296 retval = create_node(udev, class_dev);
300 if (udev_db_add_device(udev) != 0)
301 dbg("udev_db_add_dev failed, but we create the node anyway, "
302 "remove might not work for custom names");
304 /* use full path to the environment */
305 snprintf(udev->devname, NAME_SIZE, "%s/%s", udev_root, udev->name);
306 udev->devname[NAME_SIZE-1] = '\0';
308 } else if (udev->type == NET) {
309 /* look if we want to change the name of the netif */
310 if (strcmp(udev->name, udev->kernel_name) != 0) {
311 retval = rename_net_if(udev);
315 /* we've changed the name, now fake the devpath, cause the
316 * original kernel name sleeps with the fishes and we don't
317 * get an event from the kernel with the new name
319 pos = strrchr(udev->devpath, '/');
322 strfieldcat(udev->devpath, udev->name);
323 setenv("DEVPATH", udev->devpath, 1);
324 setenv("INTERFACE", udev->name, 1);
327 /* use netif name for the environment */
328 strfieldcpy(udev->devname, udev->name);