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c07669bd66
Handle all events with rules. If udev is expected to handle hotplug.d/ the exernal helper must be called. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
315 lines
7.9 KiB
C
315 lines
7.9 KiB
C
/*
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* udev-add.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <grp.h>
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#include <net/if.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <linux/sockios.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "udev_utils.h"
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#include "udev_sysfs.h"
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#include "udev_version.h"
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#include "logging.h"
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#include "udev_rules.h"
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#include "udev_db.h"
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#include "udev_selinux.h"
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int udev_make_node(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
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{
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struct stat stats;
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int retval = 0;
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if (stat(file, &stats) != 0)
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goto create;
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/* preserve node with already correct numbers, to not change the inode number */
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if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
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(stats.st_rdev == devt)) {
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info("preserve file '%s', cause it has correct dev_t", file);
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selinux_setfilecon(file, udev->kernel_name, stats.st_mode);
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goto perms;
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}
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if (unlink(file) != 0)
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dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
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else
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dbg("already present file '%s' unlinked", file);
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create:
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switch (udev->type) {
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case DEV_BLOCK:
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mode |= S_IFBLK;
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break;
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case DEV_CLASS:
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mode |= S_IFCHR;
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break;
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default:
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dbg("unknown node type %c\n", udev->type);
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return -EINVAL;
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}
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selinux_setfscreatecon(file, udev->kernel_name, mode);
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retval = mknod(file, mode, devt);
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selinux_resetfscreatecon();
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if (retval != 0) {
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err("mknod(%s, %#o, %u, %u) failed with error '%s'",
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file, mode, major(devt), minor(devt), strerror(errno));
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goto exit;
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}
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perms:
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dbg("chmod(%s, %#o)", file, mode);
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if (chmod(file, mode) != 0) {
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dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
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goto exit;
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}
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if (uid != 0 || gid != 0) {
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dbg("chown(%s, %u, %u)", file, uid, gid);
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if (chown(file, uid, gid) != 0) {
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dbg("chown(%s, %u, %u) failed with error '%s'",
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file, uid, gid, strerror(errno));
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goto exit;
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}
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}
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exit:
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return retval;
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}
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static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev)
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{
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char filename[PATH_SIZE];
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char partitionname[PATH_SIZE];
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struct name_entry *name_loop;
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uid_t uid;
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gid_t gid;
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int tail;
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int i;
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snprintf(filename, sizeof(filename), "%s/%s", udev_root, udev->name);
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filename[sizeof(filename)-1] = '\0';
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/* create parent directories if needed */
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if (strchr(udev->name, '/'))
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create_path(filename);
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if (strcmp(udev->owner, "root") == 0)
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uid = 0;
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else {
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char *endptr;
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unsigned long id;
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id = strtoul(udev->owner, &endptr, 10);
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if (endptr[0] == '\0')
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uid = (uid_t) id;
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else
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uid = lookup_user(udev->owner);
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}
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if (strcmp(udev->group, "root") == 0)
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gid = 0;
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else {
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char *endptr;
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unsigned long id;
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id = strtoul(udev->group, &endptr, 10);
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if (endptr[0] == '\0')
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gid = (gid_t) id;
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else
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gid = lookup_group(udev->group);
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}
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if (!udev->test_run) {
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info("creating device node '%s'", filename);
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if (udev_make_node(udev, filename, udev->devt, udev->mode, uid, gid) != 0)
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goto error;
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} else {
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info("creating device node '%s', major = '%d', minor = '%d', "
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"mode = '%#o', uid = '%d', gid = '%d'", filename,
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major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
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}
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/* create all_partitions if requested */
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if (udev->partitions) {
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struct sysfs_attribute *attr;
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int range;
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/* take the maximum registered minor range */
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attr = sysfs_get_classdev_attr(class_dev, "range");
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if (attr) {
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range = atoi(attr->value);
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if (range > 1)
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udev->partitions = range-1;
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}
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info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
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if (!udev->test_run) {
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for (i = 1; i <= udev->partitions; i++) {
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dev_t part_devt;
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snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
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partitionname[sizeof(partitionname)-1] = '\0';
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part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
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udev_make_node(udev, partitionname, part_devt, udev->mode, uid, gid);
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}
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}
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}
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/* create symlink(s) if requested */
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list_for_each_entry(name_loop, &udev->symlink_list, node) {
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int retval;
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char linktarget[PATH_SIZE];
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snprintf(filename, sizeof(filename), "%s/%s", udev_root, name_loop->name);
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filename[sizeof(filename)-1] = '\0';
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dbg("symlink '%s' to node '%s' requested", filename, udev->name);
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if (!udev->test_run)
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if (strchr(filename, '/'))
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create_path(filename);
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/* optimize relative link */
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linktarget[0] = '\0';
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i = 0;
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tail = 0;
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while (udev->name[i] && (udev->name[i] == name_loop->name[i])) {
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if (udev->name[i] == '/')
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tail = i+1;
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i++;
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}
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while (name_loop->name[i] != '\0') {
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if (name_loop->name[i] == '/')
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strlcat(linktarget, "../", sizeof(linktarget));
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i++;
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}
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strlcat(linktarget, &udev->name[tail], sizeof(linktarget));
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dbg("symlink(%s, %s)", linktarget, filename);
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if (!udev->test_run) {
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unlink(filename);
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selinux_setfscreatecon(filename, NULL, S_IFLNK);
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retval = symlink(linktarget, filename);
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selinux_resetfscreatecon();
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if (retval != 0)
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dbg("symlink(%s, %s) failed with error '%s'",
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linktarget, filename, strerror(errno));
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}
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}
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return 0;
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error:
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return -1;
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}
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static int rename_net_if(struct udevice *udev)
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{
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int sk;
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struct ifreq ifr;
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int retval;
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info("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
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if (udev->test_run)
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return 0;
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sk = socket(PF_INET, SOCK_DGRAM, 0);
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if (sk < 0) {
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dbg("error opening socket");
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return -1;
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}
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memset(&ifr, 0x00, sizeof(struct ifreq));
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strlcpy(ifr.ifr_name, udev->kernel_name, IFNAMSIZ);
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strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
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retval = ioctl(sk, SIOCSIFNAME, &ifr);
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if (retval != 0)
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dbg("error changing net interface name");
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close(sk);
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return retval;
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}
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int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
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{
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char *pos;
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int retval = 0;
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dbg("adding name='%s'", udev->name);
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selinux_init();
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if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) {
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retval = create_node(udev, class_dev);
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if (retval != 0)
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goto exit;
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if (udev_db_add_device(udev) != 0)
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dbg("udev_db_add_dev failed, but we create the node anyway, "
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"remove might not work for custom names");
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/* use full path to the environment */
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snprintf(udev->devname, sizeof(udev->devname), "%s/%s", udev_root, udev->name);
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udev->devname[sizeof(udev->devname)-1] = '\0';
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} else if (udev->type == DEV_NET) {
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/* look if we want to change the name of the netif */
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if (strcmp(udev->name, udev->kernel_name) != 0) {
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retval = rename_net_if(udev);
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if (retval != 0)
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goto exit;
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/* we've changed the name, now fake the devpath, cause the
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* original kernel name sleeps with the fishes and we don't
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* get an event from the kernel with the new name
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*/
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pos = strrchr(udev->devpath, '/');
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if (pos != NULL) {
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pos[1] = '\0';
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strlcat(udev->devpath, udev->name, sizeof(udev->devpath));
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setenv("DEVPATH", udev->devpath, 1);
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setenv("INTERFACE", udev->name, 1);
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}
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/* use netif name for the environment */
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strlcpy(udev->devname, udev->name, sizeof(udev->devname));
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}
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}
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exit:
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selinux_exit();
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return retval;
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}
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