/*
- * udev-node.c - device node handling
- *
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
- * 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/* preserve node with already correct numbers, to prevent changing the inode number */
if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
info("preserve file '%s', because it has correct dev_t", file);
- selinux_setfilecon(file, udev->dev->kernel_name, stats.st_mode);
+ selinux_setfilecon(file, udev->dev->kernel, stats.st_mode);
goto perms;
}
dbg("already present file '%s' unlinked", file);
create:
- selinux_setfscreatecon(file, udev->dev->kernel_name, mode);
+ selinux_setfscreatecon(file, udev->dev->kernel, mode);
retval = mknod(file, mode, devt);
selinux_resetfscreatecon();
if (retval != 0) {
return retval;
}
+static int node_symlink(const char *node, const char *slink)
+{
+ char target[PATH_SIZE] = "";
+ char buf[PATH_SIZE];
+ int i = 0;
+ int tail = 0;
+ int len;
+
+ /* use relative link */
+ while (node[i] && (node[i] == slink[i])) {
+ if (node[i] == '/')
+ tail = i+1;
+ i++;
+ }
+ while (slink[i] != '\0') {
+ if (slink[i] == '/')
+ strlcat(target, "../", sizeof(target));
+ i++;
+ }
+ strlcat(target, &node[tail], sizeof(target));
+
+ /* look if symlink already exists */
+ len = readlink(slink, buf, sizeof(buf));
+ if (len > 0) {
+ buf[len] = '\0';
+ if (strcmp(target, buf) == 0) {
+ info("preserving symlink '%s' to '%s'", slink, target);
+ selinux_setfilecon(slink, NULL, S_IFLNK);
+ goto exit;
+ }
+ info("link '%s' points to different target '%s', delete it", slink, buf);
+ unlink(slink);
+ }
+
+ /* create link */
+ info("creating symlink '%s' to '%s'", slink, target);
+ selinux_setfscreatecon(slink, NULL, S_IFLNK);
+ if (symlink(target, slink) != 0)
+ err("symlink(%s, %s) failed: %s", target, slink, strerror(errno));
+ selinux_resetfscreatecon();
+
+exit:
+ return 0;
+}
+
int udev_node_add(struct udevice *udev, struct udevice *udev_old)
{
char filename[PATH_SIZE];
- struct name_entry *name_loop;
uid_t uid;
gid_t gid;
- int tail;
int i;
int retval = 0;
- selinux_init();
-
snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
filename[sizeof(filename)-1] = '\0';
/* create parent directories if needed */
- if (strchr(udev->name, '/'))
- create_path(filename);
+ create_path(filename);
if (strcmp(udev->owner, "root") == 0)
uid = 0;
/* create symlink(s) if requested */
if (!list_empty(&udev->symlink_list)) {
- char symlinks[512] = "";
+ struct name_entry *name_loop;
+ char symlinks[PATH_SIZE] = "";
list_for_each_entry(name_loop, &udev->symlink_list, node) {
- char linktarget[PATH_SIZE];
+ char slink[PATH_SIZE];
- snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
- filename[sizeof(filename)-1] = '\0';
+ strlcpy(slink, udev_root, sizeof(slink));
+ strlcat(slink, "/", sizeof(slink));
+ strlcat(slink, name_loop->name, sizeof(slink));
- dbg("symlink '%s' to node '%s' requested", filename, udev->name);
- if (!udev->test_run)
- if (strchr(filename, '/'))
- create_path(filename);
-
- /* optimize relative link */
- linktarget[0] = '\0';
- i = 0;
- tail = 0;
- while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
- if (udev->name[i] == '/')
- tail = i+1;
- i++;
- }
- while (name_loop->name[i] != '\0') {
- if (name_loop->name[i] == '/')
- strlcat(linktarget, "../", sizeof(linktarget));
- i++;
- }
-
- strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
-
- info("creating symlink '%s' to '%s'", filename, linktarget);
+ info("creating symlink '%s' to node '%s'", slink, filename);
if (!udev->test_run) {
- unlink(filename);
- selinux_setfscreatecon(filename, NULL, S_IFLNK);
- if (symlink(linktarget, filename) != 0)
- err("symlink(%s, %s) failed: %s", linktarget, filename, strerror(errno));
- selinux_resetfscreatecon();
+ create_path(slink);
+ node_symlink(filename, slink);
}
- strlcat(symlinks, filename, sizeof(symlinks));
+ strlcat(symlinks, slink, sizeof(symlinks));
strlcat(symlinks, " ", sizeof(symlinks));
}
struct stat stats;
if (!list_empty(&udev->symlink_list)) {
- char symlinks[512] = "";
+ char symlinks[PATH_SIZE] = "";
list_for_each_entry(name_loop, &udev->symlink_list, node) {
+ char devpath[PATH_SIZE];
+
snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
filename[sizeof(filename)-1] = '\0';
info("removing symlink '%s'", filename);
if (!udev->test_run) {
unlink(filename);
+ delete_path(filename);
+ }
- if (strchr(filename, '/'))
- delete_path(filename);
+ /* see if another device wants this symlink */
+ if (udev_db_lookup_name(name_loop->name, devpath, sizeof(devpath)) == 0) {
+ struct udevice *old;
+
+ info("found overwritten symlink '%s' of '%s'", name_loop->name, devpath);
+ old = udev_device_init();
+ if (old != NULL) {
+ if (udev_db_get_device(old, devpath) == 0) {
+ char slink[PATH_SIZE];
+ char node[PATH_SIZE];
+
+ strlcpy(slink, udev_root, sizeof(slink));
+ strlcat(slink, "/", sizeof(slink));
+ strlcat(slink, name_loop->name, sizeof(slink));
+ strlcpy(node, udev_root, sizeof(node));
+ strlcat(node, "/", sizeof(node));
+ strlcat(node, old->name, sizeof(node));
+ info("restore symlink '%s' to '%s'", slink, node);
+ if (!udev->test_run)
+ node_symlink(node, slink);
+ }
+ udev_device_cleanup(old);
+ }
}
strlcat(symlinks, filename, sizeof(symlinks));
snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
filename[sizeof(filename)-1] = '\0';
-
if (stat(filename, &stats) != 0) {
dbg("device node '%s' not found", filename);
return -1;
return retval;
setenv("DEVNAME", filename, 1);
-
num = udev->partitions;
if (num > 0) {
int i;
unlink_secure(partitionname);
}
}
-
- if (strchr(udev->name, '/'))
- delete_path(filename);
-
+ delete_path(filename);
return retval;
}
~ianmdlvl / elogind.git / blobdiff