[thirdparty/systemd.git] / udev_node.c

/*
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
 * 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
 *	Free Software Foundation version 2 of the License.
 * 
 *	This program is distributed in the hope that it will be useful, but
 *	WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *	General Public License for more details.
 * 
 *	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.,
 *	51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stddef.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <grp.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "udev.h"
#include "udev_rules.h"
#include "udev_selinux.h"

#define TMP_FILE_EXT		".udev-tmp"

int udev_node_mknod(struct udevice *udev, const char *file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
{
	char file_tmp[PATH_SIZE + sizeof(TMP_FILE_EXT)];
	struct stat stats;
	int retval = 0;

	if (major(devt) != 0 && strcmp(udev->dev->subsystem, "block") == 0)
		mode |= S_IFBLK;
	else
		mode |= S_IFCHR;

	if (lstat(file, &stats) == 0) {
		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, stats.st_mode);
			goto perms;
		}
	} else {
		selinux_setfscreatecon(file, udev->dev->kernel, mode);
		retval = mknod(file, mode, devt);
		selinux_resetfscreatecon();
		if (retval == 0)
			goto perms;
	}

	info("atomically replace '%s'", file);
	strlcpy(file_tmp, file, sizeof(file_tmp));
	strlcat(file_tmp, TMP_FILE_EXT, sizeof(file_tmp));
	unlink(file_tmp);
	selinux_setfscreatecon(file_tmp, udev->dev->kernel, mode);
	retval = mknod(file_tmp, mode, devt);
	selinux_resetfscreatecon();
	if (retval != 0) {
		err("mknod(%s, %#o, %u, %u) failed: %s",
		    file_tmp, mode, major(devt), minor(devt), strerror(errno));
		goto exit;
	}
	retval = rename(file_tmp, file);
	if (retval != 0) {
		err("rename(%s, %s) failed: %s",
		    file_tmp, file, strerror(errno));
		unlink(file_tmp);
		goto exit;
	}

perms:
	dbg("chmod(%s, %#o)", file, mode);
	if (chmod(file, mode) != 0) {
		err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
		goto exit;
	}

	if (uid != 0 || gid != 0) {
		dbg("chown(%s, %u, %u)", file, uid, gid);
		if (chown(file, uid, gid) != 0) {
			err("chown(%s, %u, %u) failed: %s",
			    file, uid, gid, strerror(errno));
			goto exit;
		}
	}
exit:
	return retval;
}

static int node_symlink(const char *node, const char *slink)
{
	struct stat stats;
	char target[PATH_SIZE] = "";
	char slink_tmp[PATH_SIZE + sizeof(TMP_FILE_EXT)];
	int i = 0;
	int tail = 0;
	int len;
	int retval = 0;

	/* 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));

	/* preserve link with correct target, do not replace node of other device */
	if (lstat(slink, &stats) == 0) {
		if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
			struct stat stats2;

			info("found existing node instead of symlink '%s'", slink);
			if (lstat(node, &stats2) == 0) {
				if ((stats.st_mode & S_IFMT) == (stats2.st_mode & S_IFMT) &&
				    stats.st_rdev == stats2.st_rdev) {
					info("replace device node '%s' with symlink to our node '%s'", slink, node);
				} else {
					err("device node '%s' already exists, link to '%s' will not overwrite it", slink, node);
					goto exit;
				}
			}
		} else if (S_ISLNK(stats.st_mode)) {
			char buf[PATH_SIZE];

			info("found existing symlink '%s'", slink);
			len = readlink(slink, buf, sizeof(buf));
			if (len > 0) {
				buf[len] = '\0';
				if (strcmp(target, buf) == 0) {
					info("preserve already existing symlink '%s' to '%s'", slink, target);
					selinux_setfilecon(slink, NULL, S_IFLNK);
					goto exit;
				}
			}
		}
	} else {
		info("creating symlink '%s' to '%s'", slink, target);
		selinux_setfscreatecon(slink, NULL, S_IFLNK);
		retval = symlink(target, slink);
		selinux_resetfscreatecon();
		if (retval == 0)
			goto exit;
	}

	info("atomically replace '%s'", slink);
	strlcpy(slink_tmp, slink, sizeof(slink_tmp));
	strlcat(slink_tmp, TMP_FILE_EXT, sizeof(slink_tmp));
	unlink(slink_tmp);
	selinux_setfscreatecon(slink, NULL, S_IFLNK);
	retval = symlink(target, slink_tmp);
	selinux_resetfscreatecon();
	if (retval != 0) {
		err("symlink(%s, %s) failed: %s", target, slink_tmp, strerror(errno));
		goto exit;
	}
	retval = rename(slink_tmp, slink);
	if (retval != 0) {
		err("rename(%s, %s) failed: %s", slink_tmp, slink, strerror(errno));
		unlink(slink_tmp);
		goto exit;
	}
exit:
	return retval;
}

static int update_link(struct udevice *udev, const char *name)
{
	LIST_HEAD(name_list);
	char slink[PATH_SIZE];
	char node[PATH_SIZE];
	struct udevice *udev_db;
	struct name_entry *device;
	char target[PATH_MAX] = "";
	int count;
	int priority = 0;
	int rc = 0;

	strlcpy(slink, udev_root, sizeof(slink));
	strlcat(slink, "/", sizeof(slink));
	strlcat(slink, name, sizeof(slink));

	count = udev_db_get_devices_by_name(name, &name_list);
	info("found %i devices with name '%s'", count, name);

	/* if we don't have a reference, delete it */
	if (count <= 0) {
		info("no reference left, remove '%s'", name);
		if (!udev->test_run) {
			unlink(slink);
			delete_path(slink);
		}
		goto out;
	}

	/* find the device with the highest priority */
	list_for_each_entry(device, &name_list, node) {
		info("found '%s' for '%s'", device->name, name);

		/* did we find ourself? we win, if we have the same priority */
		if (strcmp(udev->dev->devpath, device->name) == 0) {
			info("compare (our own) priority of '%s' %i >= %i",
			     udev->dev->devpath, udev->link_priority, priority);
			if (strcmp(udev->name, name) == 0) {
				info("'%s' is our device node, database inconsistent, skip link update", udev->name);
			} else if (target[0] == '\0' || udev->link_priority >= priority) {
				priority = udev->link_priority;
				strlcpy(target, udev->name, sizeof(target));
			}
			continue;
		}

		/* another device, read priority from database */
		udev_db = udev_device_init(NULL);
		if (udev_db == NULL)
			continue;
		if (udev_db_get_device(udev_db, device->name) == 0) {
			if (strcmp(udev_db->name, name) == 0) {
				info("'%s' is a device node of '%s', skip link update", udev_db->name, device->name);
			} else {
				info("compare priority of '%s' %i > %i",
				     udev_db->dev->devpath, udev_db->link_priority, priority);
				if (target[0] == '\0' || udev_db->link_priority > priority) {
					priority = udev_db->link_priority;
					strlcpy(target, udev_db->name, sizeof(target));
				}
			}
		}
		udev_device_cleanup(udev_db);
	}
	name_list_cleanup(&name_list);

	if (target[0] == '\0') {
		info("no current target for '%s' found", name);
		rc = 1;
		goto out;
	}

	/* create symlink to the target with the highest priority */
	strlcpy(node, udev_root, sizeof(node));
	strlcat(node, "/", sizeof(node));
	strlcat(node, target, sizeof(node));
	info("'%s' with target '%s' has the highest priority %i, create it", name, target, priority);
	if (!udev->test_run) {
		create_path(slink);
		node_symlink(node, slink);
	}
out:
	return rc;
}

void udev_node_update_symlinks(struct udevice *udev, struct udevice *udev_old)
{
	struct name_entry *name_loop;
	char symlinks[PATH_SIZE] = "";

	list_for_each_entry(name_loop, &udev->symlink_list, node) {
		info("update symlink '%s' of '%s'", name_loop->name, udev->dev->devpath);
		update_link(udev, name_loop->name);
		strlcat(symlinks, udev_root, sizeof(symlinks));
		strlcat(symlinks, "/", sizeof(symlinks));
		strlcat(symlinks, name_loop->name, sizeof(symlinks));
		strlcat(symlinks, " ", sizeof(symlinks));
	}

	/* export symlinks to environment */
	remove_trailing_chars(symlinks, ' ');
	if (symlinks[0] != '\0')
		setenv("DEVLINKS", symlinks, 1);

	/* update possible left-over symlinks (device metadata changed) */
	if (udev_old != NULL) {
		struct name_entry *link_loop;
		struct name_entry *link_old_loop;
		int found;

		/* remove current symlinks from old list */
		list_for_each_entry(link_old_loop, &udev_old->symlink_list, node) {
			found = 0;
			list_for_each_entry(link_loop, &udev->symlink_list, node) {
				if (strcmp(link_old_loop->name, link_loop->name) == 0) {
					found = 1;
					break;
				}
			}
			if (!found) {
				/* link does no longer belong to this device */
				info("update old symlink '%s' no longer belonging to '%s'",
				     link_old_loop->name, udev->dev->devpath);
				update_link(udev, link_old_loop->name);
			}
		}

		/*
		 * if the node name has changed, delete the node,
		 * or possibly restore a symlink of another device
		 */
		if (strcmp(udev->name, udev_old->name) != 0)
			update_link(udev, udev_old->name);
	}
}

int udev_node_add(struct udevice *udev)
{
	char filename[PATH_SIZE];
	uid_t uid;
	gid_t gid;
	int i;
	int retval = 0;

	strlcpy(filename, udev_root, sizeof(filename));
	strlcat(filename, "/", sizeof(filename));
	strlcat(filename, udev->name, sizeof(filename));
	create_path(filename);

	if (strcmp(udev->owner, "root") == 0)
		uid = 0;
	else {
		char *endptr;
		unsigned long id;

		id = strtoul(udev->owner, &endptr, 10);
		if (endptr[0] == '\0')
			uid = (uid_t) id;
		else
			uid = lookup_user(udev->owner);
	}

	if (strcmp(udev->group, "root") == 0)
		gid = 0;
	else {
		char *endptr;
		unsigned long id;

		id = strtoul(udev->group, &endptr, 10);
		if (endptr[0] == '\0')
			gid = (gid_t) id;
		else
			gid = lookup_group(udev->group);
	}

	info("creating device node '%s', major=%d, minor=%d, mode=%#o, uid=%d, gid=%d",
	     filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid);

	if (!udev->test_run)
		if (udev_node_mknod(udev, filename, udev->devt, udev->mode, uid, gid) != 0) {
			retval = -1;
			goto exit;
		}

	setenv("DEVNAME", filename, 1);

	/* create all_partitions if requested */
	if (udev->partitions) {
		char partitionname[PATH_SIZE];
		char *attr;
		int range;

		/* take the maximum registered minor range */
		attr = sysfs_attr_get_value(udev->dev->devpath, "range");
		if (attr != NULL) {
			range = atoi(attr);
			if (range > 1)
				udev->partitions = range-1;
		}
		info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
		if (!udev->test_run) {
			for (i = 1; i <= udev->partitions; i++) {
				dev_t part_devt;

				snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
				partitionname[sizeof(partitionname)-1] = '\0';
				part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
				udev_node_mknod(udev, partitionname, part_devt, udev->mode, uid, gid);
			}
		}
	}
exit:
	return retval;
}

int udev_node_remove(struct udevice *udev)
{
	char filename[PATH_SIZE];
	char partitionname[PATH_SIZE];
	struct stat stats;
	int retval = 0;
	int num;

	strlcpy(filename, udev_root, sizeof(filename));
	strlcat(filename, "/", sizeof(filename));
	strlcat(filename, udev->name, sizeof(filename));
	if (stat(filename, &stats) != 0) {
		info("device node '%s' not found", filename);
		return 0;
	}
	if (udev->devt && stats.st_rdev != udev->devt) {
		info("device node '%s' points to a different device, skip removal", filename);
		return -1;
	}

	info("removing device node '%s'", filename);
	if (!udev->test_run)
		retval = unlink_secure(filename);
	if (retval)
		return retval;

	setenv("DEVNAME", filename, 1);
	num = udev->partitions;
	if (num > 0) {
		int i;

		info("removing all_partitions '%s[1-%i]'", filename, num);
		if (num > 255)
			return -1;
		for (i = 1; i <= num; i++) {
			snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
			partitionname[sizeof(partitionname)-1] = '\0';
			if (!udev->test_run)
				unlink_secure(partitionname);
		}
	}
	delete_path(filename);
	return retval;
}
Commit	Line	Data
ea733a2f	1	/*
ea733a2f	2	* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
27b77df4	3	* Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
ea733a2f GKH	4	*
	5	* This program is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License as published by the
	7	* Free Software Foundation version 2 of the License.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
27b77df4	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
ea733a2f GKH	17	*
	18	*/
	19
	20	#include <stdlib.h>
	21	#include <string.h>
	22	#include <stdio.h>
1aa1e248	23	#include <stddef.h>
ea733a2f GKH	24	#include <fcntl.h>
	25	#include <unistd.h>
	26	#include <errno.h>
67f69ae1	27	#include <grp.h>
24f0605c	28	#include <dirent.h>
32ff5bca	29	#include <sys/stat.h>
10950dfe	30	#include <sys/types.h>
ea733a2f GKH	31
ea733a2f GKH	32	#include "udev.h"
e5e322bc	33	#include "udev_rules.h"
fbda4a34	34	#include "udev_selinux.h"
9825617b	35
e54f0b4a	36	#define TMP_FILE_EXT ".udev-tmp"
ea733a2f	37
a4d5ca64	38	int udev_node_mknod(struct udevice udev, const char file, dev_t devt, mode_t mode, uid_t uid, gid_t gid)
50e5de03	39	{
e54f0b4a	40	char file_tmp[PATH_SIZE + sizeof(TMP_FILE_EXT)];
49747bdc KS	41	struct stat stats;
	42	int retval = 0;
	43
1aa1e248	44	if (major(devt) != 0 && strcmp(udev->dev->subsystem, "block") == 0)
57663b36	45	mode \|= S_IFBLK;
1aa1e248	46	else
57663b36	47	mode \|= S_IFCHR;
57663b36	48
e54f0b4a KS	49	if (lstat(file, &stats) == 0) {
	50	if ((stats.st_mode & S_IFMT) == (mode & S_IFMT) && (stats.st_rdev == devt)) {
	51	info("preserve file '%s', because it has correct dev_t", file);
	52	selinux_setfilecon(file, udev->dev->kernel, stats.st_mode);
	53	goto perms;
	54	}
678484af KS	55	} else {
	56	selinux_setfscreatecon(file, udev->dev->kernel, mode);
	57	retval = mknod(file, mode, devt);
	58	selinux_resetfscreatecon();
	59	if (retval == 0)
	60	goto perms;
49747bdc KS	61	}
49747bdc KS	62
e54f0b4a KS	63	info("atomically replace '%s'", file);
	64	strlcpy(file_tmp, file, sizeof(file_tmp));
	65	strlcat(file_tmp, TMP_FILE_EXT, sizeof(file_tmp));
14c79942	66	unlink(file_tmp);
e54f0b4a KS	67	selinux_setfscreatecon(file_tmp, udev->dev->kernel, mode);
	68	retval = mknod(file_tmp, mode, devt);
	69	selinux_resetfscreatecon();
50e5de03	70	if (retval != 0) {
ff3e4bed	71	err("mknod(%s, %#o, %u, %u) failed: %s",
e54f0b4a KS	72	file_tmp, mode, major(devt), minor(devt), strerror(errno));
	73	goto exit;
	74	}
	75	retval = rename(file_tmp, file);
	76	if (retval != 0) {
	77	err("rename(%s, %s) failed: %s",
	78	file_tmp, file, strerror(errno));
	79	unlink(file_tmp);
bbbe503e	80	goto exit;
50e5de03 KS	81	}
50e5de03 KS	82
49747bdc KS	83	perms:
	84	dbg("chmod(%s, %#o)", file, mode);
	85	if (chmod(file, mode) != 0) {
df4e89bf	86	err("chmod(%s, %#o) failed: %s", file, mode, strerror(errno));
bbbe503e	87	goto exit;
50e5de03 KS	88	}
	89
	90	if (uid != 0 \|\| gid != 0) {
49747bdc KS	91	dbg("chown(%s, %u, %u)", file, uid, gid);
49747bdc KS	92	if (chown(file, uid, gid) != 0) {
df4e89bf	93	err("chown(%s, %u, %u) failed: %s",
49747bdc	94	file, uid, gid, strerror(errno));
bbbe503e	95	goto exit;
50e5de03 KS	96	}
50e5de03 KS	97	}
bbbe503e KS	98	exit:
bbbe503e KS	99	return retval;
50e5de03 KS	100	}
50e5de03 KS	101
27d4bf18	102	static int node_symlink(const char node, const char slink)
fa33d857	103	{
e54f0b4a	104	struct stat stats;
27d4bf18	105	char target[PATH_SIZE] = "";
e54f0b4a	106	char slink_tmp[PATH_SIZE + sizeof(TMP_FILE_EXT)];
27d4bf18 KS	107	int i = 0;
27d4bf18 KS	108	int tail = 0;
fa33d857	109	int len;
e54f0b4a	110	int retval = 0;
fa33d857	111
27d4bf18 KS	112	/* use relative link */
	113	while (node[i] && (node[i] == slink[i])) {
	114	if (node[i] == '/')
	115	tail = i+1;
	116	i++;
	117	}
	118	while (slink[i] != '\0') {
	119	if (slink[i] == '/')
	120	strlcat(target, "../", sizeof(target));
	121	i++;
	122	}
	123	strlcat(target, &node[tail], sizeof(target));
	124
e54f0b4a KS	125	/* preserve link with correct target, do not replace node of other device */
	126	if (lstat(slink, &stats) == 0) {
	127	if (S_ISBLK(stats.st_mode) \|\| S_ISCHR(stats.st_mode)) {
	128	struct stat stats2;
	129
	130	info("found existing node instead of symlink '%s'", slink);
	131	if (lstat(node, &stats2) == 0) {
	132	if ((stats.st_mode & S_IFMT) == (stats2.st_mode & S_IFMT) &&
	133	stats.st_rdev == stats2.st_rdev) {
	134	info("replace device node '%s' with symlink to our node '%s'", slink, node);
	135	} else {
89e0a022	136	err("device node '%s' already exists, link to '%s' will not overwrite it", slink, node);
e54f0b4a KS	137	goto exit;
	138	}
	139	}
	140	} else if (S_ISLNK(stats.st_mode)) {
	141	char buf[PATH_SIZE];
	142
	143	info("found existing symlink '%s'", slink);
	144	len = readlink(slink, buf, sizeof(buf));
	145	if (len > 0) {
	146	buf[len] = '\0';
	147	if (strcmp(target, buf) == 0) {
	148	info("preserve already existing symlink '%s' to '%s'", slink, target);
	149	selinux_setfilecon(slink, NULL, S_IFLNK);
	150	goto exit;
	151	}
	152	}
fa33d857	153	}
678484af KS	154	} else {
	155	info("creating symlink '%s' to '%s'", slink, target);
	156	selinux_setfscreatecon(slink, NULL, S_IFLNK);
	157	retval = symlink(target, slink);
	158	selinux_resetfscreatecon();
	159	if (retval == 0)
	160	goto exit;
fa33d857 KS	161	}
fa33d857 KS	162
e54f0b4a KS	163	info("atomically replace '%s'", slink);
	164	strlcpy(slink_tmp, slink, sizeof(slink_tmp));
	165	strlcat(slink_tmp, TMP_FILE_EXT, sizeof(slink_tmp));
14c79942	166	unlink(slink_tmp);
35ea39e2	167	selinux_setfscreatecon(slink, NULL, S_IFLNK);
e54f0b4a KS	168	retval = symlink(target, slink_tmp);
	169	selinux_resetfscreatecon();
	170	if (retval != 0) {
	171	err("symlink(%s, %s) failed: %s", target, slink_tmp, strerror(errno));
	172	goto exit;
	173	}
	174	retval = rename(slink_tmp, slink);
	175	if (retval != 0) {
	176	err("rename(%s, %s) failed: %s", slink_tmp, slink, strerror(errno));
	177	unlink(slink_tmp);
	178	goto exit;
	179	}
fa33d857	180	exit:
e54f0b4a	181	return retval;
fa33d857 KS	182	}
fa33d857 KS	183
24f0605c KS	184	static int update_link(struct udevice udev, const char name)
	185	{
	186	LIST_HEAD(name_list);
	187	char slink[PATH_SIZE];
	188	char node[PATH_SIZE];
	189	struct udevice *udev_db;
	190	struct name_entry *device;
	191	char target[PATH_MAX] = "";
	192	int count;
	193	int priority = 0;
	194	int rc = 0;
	195
	196	strlcpy(slink, udev_root, sizeof(slink));
	197	strlcat(slink, "/", sizeof(slink));
	198	strlcat(slink, name, sizeof(slink));
	199
	200	count = udev_db_get_devices_by_name(name, &name_list);
	201	info("found %i devices with name '%s'", count, name);
	202
eff4a673	203	/* if we don't have a reference, delete it */
24f0605c KS	204	if (count <= 0) {
	205	info("no reference left, remove '%s'", name);
	206	if (!udev->test_run) {
	207	unlink(slink);
	208	delete_path(slink);
	209	}
	210	goto out;
	211	}
	212
	213	/* find the device with the highest priority */
	214	list_for_each_entry(device, &name_list, node) {
	215	info("found '%s' for '%s'", device->name, name);
	216
	217	/* did we find ourself? we win, if we have the same priority */
	218	if (strcmp(udev->dev->devpath, device->name) == 0) {
	219	info("compare (our own) priority of '%s' %i >= %i",
	220	udev->dev->devpath, udev->link_priority, priority);
b2d1ae72 KS	221	if (strcmp(udev->name, name) == 0) {
	222	info("'%s' is our device node, database inconsistent, skip link update", udev->name);
	223	} else if (target[0] == '\0' \|\| udev->link_priority >= priority) {
24f0605c KS	224	priority = udev->link_priority;
	225	strlcpy(target, udev->name, sizeof(target));
	226	}
	227	continue;
	228	}
	229
b2d1ae72	230	/* another device, read priority from database */
24f0605c KS	231	udev_db = udev_device_init(NULL);
	232	if (udev_db == NULL)
	233	continue;
	234	if (udev_db_get_device(udev_db, device->name) == 0) {
25c208d6 KS	235	if (strcmp(udev_db->name, name) == 0) {
	236	info("'%s' is a device node of '%s', skip link update", udev_db->name, device->name);
	237	} else {
	238	info("compare priority of '%s' %i > %i",
	239	udev_db->dev->devpath, udev_db->link_priority, priority);
	240	if (target[0] == '\0' \|\| udev_db->link_priority > priority) {
	241	priority = udev_db->link_priority;
	242	strlcpy(target, udev_db->name, sizeof(target));
	243	}
24f0605c KS	244	}
	245	}
	246	udev_device_cleanup(udev_db);
	247	}
	248	name_list_cleanup(&name_list);
	249
	250	if (target[0] == '\0') {
25c208d6 KS	251	info("no current target for '%s' found", name);
25c208d6 KS	252	rc = 1;
24f0605c KS	253	goto out;
	254	}
	255
	256	/* create symlink to the target with the highest priority */
	257	strlcpy(node, udev_root, sizeof(node));
	258	strlcat(node, "/", sizeof(node));
	259	strlcat(node, target, sizeof(node));
	260	info("'%s' with target '%s' has the highest priority %i, create it", name, target, priority);
	261	if (!udev->test_run) {
	262	create_path(slink);
	263	node_symlink(node, slink);
	264	}
	265	out:
	266	return rc;
	267	}
	268
	269	void udev_node_update_symlinks(struct udevice udev, struct udevice udev_old)
	270	{
	271	struct name_entry *name_loop;
	272	char symlinks[PATH_SIZE] = "";
	273
	274	list_for_each_entry(name_loop, &udev->symlink_list, node) {
	275	info("update symlink '%s' of '%s'", name_loop->name, udev->dev->devpath);
	276	update_link(udev, name_loop->name);
	277	strlcat(symlinks, udev_root, sizeof(symlinks));
	278	strlcat(symlinks, "/", sizeof(symlinks));
	279	strlcat(symlinks, name_loop->name, sizeof(symlinks));
	280	strlcat(symlinks, " ", sizeof(symlinks));
	281	}
	282
	283	/* export symlinks to environment */
	284	remove_trailing_chars(symlinks, ' ');
	285	if (symlinks[0] != '\0')
	286	setenv("DEVLINKS", symlinks, 1);
	287
	288	/* update possible left-over symlinks (device metadata changed) */
	289	if (udev_old != NULL) {
	290	struct name_entry *link_loop;
	291	struct name_entry *link_old_loop;
24f0605c KS	292	int found;
	293
	294	/* remove current symlinks from old list */
eff4a673	295	list_for_each_entry(link_old_loop, &udev_old->symlink_list, node) {
24f0605c KS	296	found = 0;
	297	list_for_each_entry(link_loop, &udev->symlink_list, node) {
	298	if (strcmp(link_old_loop->name, link_loop->name) == 0) {
	299	found = 1;
	300	break;
	301	}
	302	}
	303	if (!found) {
	304	/* link does no longer belong to this device */
	305	info("update old symlink '%s' no longer belonging to '%s'",
	306	link_old_loop->name, udev->dev->devpath);
	307	update_link(udev, link_old_loop->name);
	308	}
	309	}
604f104a	310
eff4a673 KS	311	/*
	312	* if the node name has changed, delete the node,
	313	* or possibly restore a symlink of another device
	314	*/
	315	if (strcmp(udev->name, udev_old->name) != 0)
	316	update_link(udev, udev_old->name);
24f0605c KS	317	}
	318	}
	319
	320	int udev_node_add(struct udevice *udev)
97853b4f	321	{
63f61c5c	322	char filename[PATH_SIZE];
783272f0 KS	323	uid_t uid;
783272f0 KS	324	gid_t gid;
e48fc108	325	int i;
a4d5ca64 KS	326	int retval = 0;
a4d5ca64 KS	327
24f0605c KS	328	strlcpy(filename, udev_root, sizeof(filename));
	329	strlcat(filename, "/", sizeof(filename));
	330	strlcat(filename, udev->name, sizeof(filename));
27d4bf18	331	create_path(filename);
218eae87	332
783272f0 KS	333	if (strcmp(udev->owner, "root") == 0)
	334	uid = 0;
	335	else {
c19a6b30	336	char *endptr;
783272f0	337	unsigned long id;
6d564166	338
783272f0	339	id = strtoul(udev->owner, &endptr, 10);
765cbd97	340	if (endptr[0] == '\0')
c19a6b30	341	uid = (uid_t) id;
57e1a277 KS	342	else
57e1a277 KS	343	uid = lookup_user(udev->owner);
c19a6b30 KS	344	}
c19a6b30 KS	345
783272f0 KS	346	if (strcmp(udev->group, "root") == 0)
	347	gid = 0;
	348	else {
c19a6b30	349	char *endptr;
783272f0	350	unsigned long id;
6d564166	351
783272f0	352	id = strtoul(udev->group, &endptr, 10);
765cbd97	353	if (endptr[0] == '\0')
c19a6b30	354	gid = (gid_t) id;
57e1a277	355	else
68c2c0b5	356	gid = lookup_group(udev->group);
c19a6b30 KS	357	}
c19a6b30 KS	358
e54f0b4a	359	info("creating device node '%s', major=%d, minor=%d, mode=%#o, uid=%d, gid=%d",
ad27f5b3 KS	360	filename, major(udev->devt), minor(udev->devt), udev->mode, uid, gid);
	361
	362	if (!udev->test_run)
a4d5ca64 KS	363	if (udev_node_mknod(udev, filename, udev->devt, udev->mode, uid, gid) != 0) {
	364	retval = -1;
	365	goto exit;
	366	}
ad27f5b3 KS	367
ad27f5b3 KS	368	setenv("DEVNAME", filename, 1);
50e5de03	369
bbbe503e	370	/* create all_partitions if requested */
fd9efc00	371	if (udev->partitions) {
fb6e4c28	372	char partitionname[PATH_SIZE];
1aa1e248	373	char *attr;
6d564166 KS	374	int range;
	375
	376	/* take the maximum registered minor range */
1aa1e248	377	attr = sysfs_attr_get_value(udev->dev->devpath, "range");
953249a3	378	if (attr != NULL) {
1aa1e248	379	range = atoi(attr);
6d564166 KS	380	if (range > 1)
	381	udev->partitions = range-1;
	382	}
7a947ce5 KS	383	info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
	384	if (!udev->test_run) {
	385	for (i = 1; i <= udev->partitions; i++) {
7e720bd4 KS	386	dev_t part_devt;
7e720bd4 KS	387
63f61c5c KS	388	snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
63f61c5c KS	389	partitionname[sizeof(partitionname)-1] = '\0';
15139b8a	390	part_devt = makedev(major(udev->devt), minor(udev->devt) + i);
a4d5ca64	391	udev_node_mknod(udev, partitionname, part_devt, udev->mode, uid, gid);
ab2e5bd9	392	}
50e5de03	393	}
3d150dfb	394	}
a4d5ca64	395	exit:
a4d5ca64	396	return retval;
ea733a2f GKH	397	}
ea733a2f GKH	398
ff9a488d KS	399	int udev_node_remove(struct udevice *udev)
	400	{
	401	char filename[PATH_SIZE];
	402	char partitionname[PATH_SIZE];
	403	struct stat stats;
eff4a673	404	int retval = 0;
ff9a488d KS	405	int num;
ff9a488d KS	406
24f0605c KS	407	strlcpy(filename, udev_root, sizeof(filename));
	408	strlcat(filename, "/", sizeof(filename));
	409	strlcat(filename, udev->name, sizeof(filename));
a4d5ca64	410	if (stat(filename, &stats) != 0) {
a0092d28 AA	411	info("device node '%s' not found", filename);
a0092d28 AA	412	return 0;
a4d5ca64 KS	413	}
	414	if (udev->devt && stats.st_rdev != udev->devt) {
	415	info("device node '%s' points to a different device, skip removal", filename);
	416	return -1;
	417	}
	418
	419	info("removing device node '%s'", filename);
eff4a673 KS	420	if (!udev->test_run)
eff4a673 KS	421	retval = unlink_secure(filename);
a4d5ca64 KS	422	if (retval)
	423	return retval;
	424
	425	setenv("DEVNAME", filename, 1);
a4d5ca64 KS	426	num = udev->partitions;
a4d5ca64 KS	427	if (num > 0) {
ff9a488d KS	428	int i;
ff9a488d KS	429
a4d5ca64	430	info("removing all_partitions '%s[1-%i]'", filename, num);
d7fdcd61	431	if (num > 255)
a4d5ca64	432	return -1;
a4d5ca64 KS	433	for (i = 1; i <= num; i++) {
	434	snprintf(partitionname, sizeof(partitionname), "%s%d", filename, i);
	435	partitionname[sizeof(partitionname)-1] = '\0';
eff4a673 KS	436	if (!udev->test_run)
eff4a673 KS	437	unlink_secure(partitionname);
5d24c6ca	438	}
f61d732a	439	}
27d4bf18	440	delete_path(filename);
ea733a2f GKH	441	return retval;
ea733a2f GKH	442	}