[thirdparty/systemd.git] / udev_add.c

/*
 * udev-add.c
 *
 * Userspace devfs
 *
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
 *
 *
 *	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.,
 *	675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <grp.h>
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <linux/sockios.h>
#ifndef __KLIBC__
#include <pwd.h>
#include <utmp.h>
#endif

#include "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
#include "udev_lib.h"
#include "udev_version.h"
#include "logging.h"
#include "namedev.h"
#include "udevdb.h"
#include "klibc_fixups.h"

#define LOCAL_USER "$local"

#include "selinux.h"

/*
 * the major/minor of a device is stored in a file called "dev"
 * The number is stored in decimal values in the format: M:m
 */
static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
{
	struct sysfs_attribute *attr = NULL;

	attr = sysfs_get_classdev_attr(class_dev, "dev");
	if (attr == NULL)
		goto error;
	dbg("dev='%s'", attr->value);

	if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
		goto error;
	dbg("found major=%d, minor=%d", udev->major, udev->minor);

	return 0;
error:
	return -1;
}

static int create_path(char *file)
{
	char p[NAME_SIZE];
	char *pos;
	int retval;
	struct stat stats;
	
	strfieldcpy(p, file);
	pos = strchr(p+1, '/');
	while (1) {
		pos = strchr(pos+1, '/');
		if (pos == NULL)
			break;
		*pos = 0x00;
		if (stat(p, &stats)) {
			selinux_setfscreatecon(p, S_IFDIR);
			retval = mkdir(p, 0755);
			if (retval != 0) {
				dbg("mkdir(%s) failed with error '%s'",
				    p, strerror(errno));
				return retval;
			}
			dbg("created '%s'", p);
		} else {
			selinux_setfilecon(p, S_IFDIR);
		}
		*pos = '/';
	}
	return 0;
}

static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
{
	struct stat stats;
	int retval = 0;

	if (stat(file, &stats) != 0)
		goto create;

	/* preserve node with already correct numbers, to not change the inode number */
	if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) &&
	    (stats.st_rdev == makedev(major, minor))) {
		dbg("preserve file '%s', cause it has correct dev_t", file);
		selinux_setfilecon(file,stats.st_mode);
		goto perms;
	}

	if (unlink(file) != 0)
		dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
	else
		dbg("already present file '%s' unlinked", file);

create:
	selinux_setfscreatecon(file, mode);
	retval = mknod(file, mode, makedev(major, minor));
	if (retval != 0) {
		dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
		    file, mode, major, minor, strerror(errno));
		goto exit;
	}

perms:
	dbg("chmod(%s, %#o)", file, mode);
	if (chmod(file, mode) != 0) {
		dbg("chmod(%s, %#o) failed with error '%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) {
			dbg("chown(%s, %u, %u) failed with error '%s'",
			    file, uid, gid, strerror(errno));
			goto exit;
		}
	}

exit:
	return retval;
}

/* get the local logged in user */
static void set_to_local_user(char *user)
{
	struct utmp *u;
	time_t recent = 0;

	strfieldcpymax(user, default_owner_str, OWNER_SIZE);
	setutent();
	while (1) {
		u = getutent();
		if (u == NULL)
			break;

		/* is this a user login ? */
		if (u->ut_type != USER_PROCESS)
			continue;

		/* is this a local login ? */
		if (strcmp(u->ut_host, ""))
			continue;

		if (u->ut_time > recent) {
			recent = u->ut_time;
			strfieldcpymax(user, u->ut_user, OWNER_SIZE);
			dbg("local user is '%s'", user);
			break;
		}
	}
	endutent();
}

static int create_node(struct udevice *udev)
{
	char filename[NAME_SIZE];
	char linkname[NAME_SIZE];
	char linktarget[NAME_SIZE];
	char partitionname[NAME_SIZE];
	uid_t uid = 0;
	gid_t gid = 0;
	int i;
	int tail;
	char *pos;
	int len;

	strfieldcpy(filename, udev_root);
	strfieldcat(filename, udev->name);

	switch (udev->type) {
	case 'b':
		udev->mode |= S_IFBLK;
		break;
	case 'c':
	case 'u':
		udev->mode |= S_IFCHR;
		break;
	case 'p':
		udev->mode |= S_IFIFO;
		break;
	default:
		dbg("unknown node type %c\n", udev->type);
		return -EINVAL;
	}

	/* create parent directories if needed */
	if (strrchr(udev->name, '/'))
		create_path(filename);

	if (udev->owner[0] != '\0') {
		char *endptr;
		unsigned long id = strtoul(udev->owner, &endptr, 10);
		if (endptr[0] == '\0')
			uid = (uid_t) id;
		else {
			struct passwd *pw;
			if (strncmp(udev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
				set_to_local_user(udev->owner);

			pw = getpwnam(udev->owner);
			if (pw == NULL)
				dbg("specified user unknown '%s'", udev->owner);
			else
				uid = pw->pw_uid;
		}
	}

	if (udev->group[0] != '\0') {
		char *endptr;
		unsigned long id = strtoul(udev->group, &endptr, 10);
		if (endptr[0] == '\0')
			gid = (gid_t) id;
		else {
			struct group *gr = getgrnam(udev->group);
			if (gr == NULL)
				dbg("specified group unknown '%s'", udev->group);
			else
				gid = gr->gr_gid;
		}
	}

	if (!udev->test_run) {
		info("creating device node '%s'", filename);
		if (make_node(filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
			goto error;
	} else {
		info("creating device node '%s', major = '%d', minor = '%d', "
		     "mode = '%#o', uid = '%d', gid = '%d'", filename,
		     udev->major, udev->minor, (mode_t)udev->mode, uid, gid);
	}

	/* create all_partitions if requested */
	if (udev->partitions > 0) {
		info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
		if (!udev->test_run) {
			for (i = 1; i <= udev->partitions; i++) {
				strfieldcpy(partitionname, filename);
				strintcat(partitionname, i);
				make_node(partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
			}
		}
	}

	/* create symlink(s) if requested */
	foreach_strpart(udev->symlink, " ", pos, len) {
		strfieldcpymax(linkname, pos, len+1);
		strfieldcpy(filename, udev_root);
		strfieldcat(filename, linkname);
		dbg("symlink '%s' to node '%s' requested", filename, udev->name);
		if (!udev->test_run)
			if (strrchr(linkname, '/'))
				create_path(filename);

		/* optimize relative link */
		linktarget[0] = '\0';
		i = 0;
		tail = 0;
		while ((udev->name[i] == linkname[i]) && udev->name[i]) {
			if (udev->name[i] == '/')
				tail = i+1;
			i++;
		}
		while (linkname[i] != '\0') {
			if (linkname[i] == '/')
				strfieldcat(linktarget, "../");
			i++;
		}

		strfieldcat(linktarget, &udev->name[tail]);

		dbg("symlink(%s, %s)", linktarget, filename);
		if (!udev->test_run) {
			selinux_setfscreatecon(filename, S_IFLNK);
			unlink(filename);
			if (symlink(linktarget, filename) != 0)
				dbg("symlink(%s, %s) failed with error '%s'",
				    linktarget, filename, strerror(errno));
		}
	}

	return 0;
error:
	return -1;
}

static int rename_net_if(struct udevice *udev)
{
	int sk;
	struct ifreq ifr;
	int retval;

	dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
	if (udev->test_run)
		return 0;

	sk = socket(PF_INET, SOCK_DGRAM, 0);
	if (sk < 0) {
		dbg("error opening socket");
		return -1;
	}

	memset(&ifr, 0x00, sizeof(struct ifreq));
	strfieldcpy(ifr.ifr_name, udev->kernel_name);
	strfieldcpy(ifr.ifr_newname, udev->name);

	retval = ioctl(sk, SIOCSIFNAME, &ifr);
	if (retval != 0)
		dbg("error changing net interface name");
	close(sk);

	return retval;
}

int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev)
{
	char *pos;
	int retval = 0;

	if (udev->type == 'b' || udev->type == 'c') {
		retval = get_major_minor(class_dev, udev);
		if (retval != 0) {
			dbg("no dev-file found, do nothing");
			return 0;
		}
	}

	if (namedev_name_device(udev, class_dev) != 0)
		goto exit;

	dbg("adding name='%s'", udev->name);

	selinux_init();

	if (udev->type == 'b' || udev->type == 'c') {
		retval = create_node(udev);
		if (retval != 0)
			goto exit;

		if (udevdb_add_dev(udev) != 0)
			dbg("udevdb_add_dev failed, but we create the node anyway, "
			    "remove might not work for custom names");

		/* use full path to the environment */
		snprintf(udev->devname, NAME_SIZE-1, "%s%s", udev_root, udev->name);

	} else if (udev->type == 'n') {
		/* look if we want to change the name of the netif */
		if (strcmp(udev->name, udev->kernel_name) != 0) {
			retval = rename_net_if(udev);
			if (retval != 0)
				goto exit;

			/* we've changed the name, now fake the devpath,
			 * cause original kernel name sleeps with the fishes
			 * and we don't get any event from the kernel now
			 */
			pos = strrchr(udev->devpath, '/');
			if (pos != NULL) {
				pos[1] = '\0';
				strfieldcat(udev->devpath, udev->name);
				setenv("DEVPATH", udev->devpath, 1);
			}

			/* use netif name for the environment */
			strfieldcpy(udev->devname, udev->name);
		}
	}

exit:
	selinux_restore();

	return retval;
}
Commit	Line	Data
ea733a2f GKH	1	/*
	2	* udev-add.c
	3	*
	4	* Userspace devfs
	5	*
	6	* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
	7	*
	8	*
	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.
	12	*
	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.
	17	*
	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.
	21	*
	22	*/
	23
	24	#include <stdlib.h>
	25	#include <string.h>
	26	#include <stdio.h>
	27	#include <fcntl.h>
	28	#include <unistd.h>
	29	#include <errno.h>
32ff5bca	30	#include <sys/stat.h>
10950dfe GKH	31	#include <sys/types.h>
10950dfe GKH	32	#include <grp.h>
f61d732a KS	33	#include <net/if.h>
	34	#include <sys/socket.h>
	35	#include <sys/ioctl.h>
	36	#include <linux/sockios.h>
10950dfe GKH	37	#ifndef __KLIBC__
10950dfe GKH	38	#include <pwd.h>
534c853d	39	#include <utmp.h>
10950dfe	40	#endif
ea733a2f	41
c80da508	42	#include "libsysfs/sysfs/libsysfs.h"
ea733a2f	43	#include "udev.h"
c81b35c0	44	#include "udev_lib.h"
ea733a2f	45	#include "udev_version.h"
54988802	46	#include "logging.h"
ea733a2f	47	#include "namedev.h"
8e41d35d	48	#include "udevdb.h"
10950dfe	49	#include "klibc_fixups.h"
ea733a2f	50
534c853d KS	51	#define LOCAL_USER "$local"
534c853d KS	52
9825617b HH	53	#include "selinux.h"
9825617b HH	54
707680b1 KS	55	/*
	56	* the major/minor of a device is stored in a file called "dev"
	57	* The number is stored in decimal values in the format: M:m
ea733a2f	58	*/
30defadd	59	static int get_major_minor(struct sysfs_class_device class_dev, struct udevice udev)
ea733a2f	60	{
5d4754f1	61	struct sysfs_attribute *attr = NULL;
ea733a2f	62
5d4754f1 DS	63	attr = sysfs_get_classdev_attr(class_dev, "dev");
5d4754f1 DS	64	if (attr == NULL)
bbbe503e	65	goto error;
5d4754f1	66	dbg("dev='%s'", attr->value);
ea733a2f	67
5d4754f1	68	if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2)
bbbe503e	69	goto error;
f7b4eca4	70	dbg("found major=%d, minor=%d", udev->major, udev->minor);
ea733a2f	71
bbbe503e KS	72	return 0;
	73	error:
	74	return -1;
ea733a2f GKH	75	}
ea733a2f GKH	76
3d150dfb KS	77	static int create_path(char *file)
	78	{
	79	char p[NAME_SIZE];
	80	char *pos;
	81	int retval;
	82	struct stat stats;
	83
c472e3c8	84	strfieldcpy(p, file);
3d150dfb KS	85	pos = strchr(p+1, '/');
	86	while (1) {
	87	pos = strchr(pos+1, '/');
	88	if (pos == NULL)
	89	break;
	90	*pos = 0x00;
	91	if (stat(p, &stats)) {
9825617b	92	selinux_setfscreatecon(p, S_IFDIR);
3d150dfb	93	retval = mkdir(p, 0755);
c5118442	94	if (retval != 0) {
3d150dfb KS	95	dbg("mkdir(%s) failed with error '%s'",
	96	p, strerror(errno));
	97	return retval;
	98	}
	99	dbg("created '%s'", p);
9825617b HH	100	} else {
9825617b HH	101	selinux_setfilecon(p, S_IFDIR);
3d150dfb KS	102	}
	103	*pos = '/';
	104	}
	105	return 0;
	106	}
	107
49747bdc	108	static int make_node(char *file, int major, int minor, unsigned int mode, uid_t uid, gid_t gid)
50e5de03	109	{
49747bdc KS	110	struct stat stats;
	111	int retval = 0;
	112
	113	if (stat(file, &stats) != 0)
	114	goto create;
	115
	116	/* preserve node with already correct numbers, to not change the inode number */
	117	if (((stats.st_mode & S_IFMT) == S_IFBLK \|\| (stats.st_mode & S_IFMT) == S_IFCHR) &&
	118	(stats.st_rdev == makedev(major, minor))) {
	119	dbg("preserve file '%s', cause it has correct dev_t", file);
9825617b	120	selinux_setfilecon(file,stats.st_mode);
49747bdc KS	121	goto perms;
	122	}
	123
	124	if (unlink(file) != 0)
	125	dbg("unlink(%s) failed with error '%s'", file, strerror(errno));
	126	else
	127	dbg("already present file '%s' unlinked", file);
50e5de03	128
49747bdc	129	create:
9825617b	130	selinux_setfscreatecon(file, mode);
49747bdc	131	retval = mknod(file, mode, makedev(major, minor));
50e5de03 KS	132	if (retval != 0) {
50e5de03 KS	133	dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
49747bdc	134	file, mode, major, minor, strerror(errno));
bbbe503e	135	goto exit;
50e5de03 KS	136	}
50e5de03 KS	137
49747bdc KS	138	perms:
	139	dbg("chmod(%s, %#o)", file, mode);
	140	if (chmod(file, mode) != 0) {
	141	dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno));
bbbe503e	142	goto exit;
50e5de03 KS	143	}
	144
	145	if (uid != 0 \|\| gid != 0) {
49747bdc KS	146	dbg("chown(%s, %u, %u)", file, uid, gid);
49747bdc KS	147	if (chown(file, uid, gid) != 0) {
50e5de03	148	dbg("chown(%s, %u, %u) failed with error '%s'",
49747bdc	149	file, uid, gid, strerror(errno));
bbbe503e	150	goto exit;
50e5de03 KS	151	}
	152	}
	153
bbbe503e KS	154	exit:
bbbe503e KS	155	return retval;
50e5de03 KS	156	}
50e5de03 KS	157
534c853d KS	158	/* get the local logged in user */
	159	static void set_to_local_user(char *user)
	160	{
	161	struct utmp *u;
	162	time_t recent = 0;
	163
17794d77	164	strfieldcpymax(user, default_owner_str, OWNER_SIZE);
534c853d KS	165	setutent();
	166	while (1) {
	167	u = getutent();
	168	if (u == NULL)
	169	break;
	170
	171	/* is this a user login ? */
	172	if (u->ut_type != USER_PROCESS)
	173	continue;
	174
	175	/* is this a local login ? */
	176	if (strcmp(u->ut_host, ""))
	177	continue;
	178
	179	if (u->ut_time > recent) {
	180	recent = u->ut_time;
17794d77	181	strfieldcpymax(user, u->ut_user, OWNER_SIZE);
534c853d KS	182	dbg("local user is '%s'", user);
	183	break;
	184	}
	185	}
	186	endutent();
	187	}
	188
7a947ce5	189	static int create_node(struct udevice *udev)
97853b4f	190	{
9fe3f9a9 KS	191	char filename[NAME_SIZE];
	192	char linkname[NAME_SIZE];
	193	char linktarget[NAME_SIZE];
	194	char partitionname[NAME_SIZE];
e308ebb7 GKH	195	uid_t uid = 0;
e308ebb7 GKH	196	gid_t gid = 0;
3d150dfb KS	197	int i;
3d150dfb KS	198	int tail;
ef672b3d KS	199	char *pos;
ef672b3d KS	200	int len;
3d150dfb	201
c472e3c8	202	strfieldcpy(filename, udev_root);
7a947ce5	203	strfieldcat(filename, udev->name);
5840bc63	204
7a947ce5	205	switch (udev->type) {
1331c889	206	case 'b':
7a947ce5	207	udev->mode \|= S_IFBLK;
1331c889 GKH	208	break;
	209	case 'c':
	210	case 'u':
7a947ce5	211	udev->mode \|= S_IFCHR;
1331c889 GKH	212	break;
1331c889 GKH	213	case 'p':
7a947ce5	214	udev->mode \|= S_IFIFO;
1331c889 GKH	215	break;
1331c889 GKH	216	default:
7a947ce5	217	dbg("unknown node type %c\n", udev->type);
1331c889 GKH	218	return -EINVAL;
1331c889 GKH	219	}
0abf54fc	220
3d150dfb	221	/* create parent directories if needed */
7a947ce5	222	if (strrchr(udev->name, '/'))
3d150dfb	223	create_path(filename);
218eae87	224
7a947ce5	225	if (udev->owner[0] != '\0') {
c19a6b30	226	char *endptr;
7a947ce5	227	unsigned long id = strtoul(udev->owner, &endptr, 10);
765cbd97	228	if (endptr[0] == '\0')
c19a6b30	229	uid = (uid_t) id;
10950dfe	230	else {
5895eb31	231	struct passwd *pw;
7a947ce5 KS	232	if (strncmp(udev->owner, LOCAL_USER, sizeof(LOCAL_USER)) == 0)
7a947ce5 KS	233	set_to_local_user(udev->owner);
534c853d	234
7a947ce5	235	pw = getpwnam(udev->owner);
765cbd97	236	if (pw == NULL)
7a947ce5	237	dbg("specified user unknown '%s'", udev->owner);
10950dfe GKH	238	else
	239	uid = pw->pw_uid;
	240	}
c19a6b30 KS	241	}
c19a6b30 KS	242
7a947ce5	243	if (udev->group[0] != '\0') {
c19a6b30	244	char *endptr;
7a947ce5	245	unsigned long id = strtoul(udev->group, &endptr, 10);
765cbd97	246	if (endptr[0] == '\0')
c19a6b30	247	gid = (gid_t) id;
10950dfe	248	else {
7a947ce5	249	struct group *gr = getgrnam(udev->group);
765cbd97	250	if (gr == NULL)
7a947ce5	251	dbg("specified group unknown '%s'", udev->group);
10950dfe GKH	252	else
	253	gid = gr->gr_gid;
	254	}
c19a6b30 KS	255	}
c19a6b30 KS	256
7a947ce5	257	if (!udev->test_run) {
50e5de03	258	info("creating device node '%s'", filename);
7a947ce5	259	if (make_node(filename, udev->major, udev->minor, udev->mode, uid, gid) != 0)
bbbe503e	260	goto error;
ab2e5bd9 GKH	261	} else {
	262	info("creating device node '%s', major = '%d', minor = '%d', "
	263	"mode = '%#o', uid = '%d', gid = '%d'", filename,
7a947ce5	264	udev->major, udev->minor, (mode_t)udev->mode, uid, gid);
ab2e5bd9	265	}
50e5de03	266
bbbe503e	267	/* create all_partitions if requested */
7a947ce5 KS	268	if (udev->partitions > 0) {
	269	info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions);
	270	if (!udev->test_run) {
	271	for (i = 1; i <= udev->partitions; i++) {
c58e36c0 KS	272	strfieldcpy(partitionname, filename);
c58e36c0 KS	273	strintcat(partitionname, i);
7a947ce5	274	make_node(partitionname, udev->major, udev->minor + i, udev->mode, uid, gid);
ab2e5bd9	275	}
50e5de03	276	}
3d150dfb KS	277	}
3d150dfb KS	278
bbbe503e	279	/* create symlink(s) if requested */
7a947ce5	280	foreach_strpart(udev->symlink, " ", pos, len) {
17794d77	281	strfieldcpymax(linkname, pos, len+1);
9fe3f9a9 KS	282	strfieldcpy(filename, udev_root);
9fe3f9a9 KS	283	strfieldcat(filename, linkname);
7a947ce5 KS	284	dbg("symlink '%s' to node '%s' requested", filename, udev->name);
7a947ce5 KS	285	if (!udev->test_run)
9fe3f9a9 KS	286	if (strrchr(linkname, '/'))
	287	create_path(filename);
	288
	289	/* optimize relative link */
	290	linktarget[0] = '\0';
	291	i = 0;
	292	tail = 0;
7a947ce5 KS	293	while ((udev->name[i] == linkname[i]) && udev->name[i]) {
7a947ce5 KS	294	if (udev->name[i] == '/')
9fe3f9a9 KS	295	tail = i+1;
	296	i++;
	297	}
	298	while (linkname[i] != '\0') {
	299	if (linkname[i] == '/')
	300	strfieldcat(linktarget, "../");
	301	i++;
	302	}
3d150dfb	303
7a947ce5	304	strfieldcat(linktarget, &udev->name[tail]);
3d150dfb	305
9fe3f9a9	306	dbg("symlink(%s, %s)", linktarget, filename);
7a947ce5	307	if (!udev->test_run) {
9825617b	308	selinux_setfscreatecon(filename, S_IFLNK);
49747bdc	309	unlink(filename);
bbbe503e	310	if (symlink(linktarget, filename) != 0)
9fe3f9a9 KS	311	dbg("symlink(%s, %s) failed with error '%s'",
9fe3f9a9 KS	312	linktarget, filename, strerror(errno));
4763256c	313	}
c19a6b30 KS	314	}
c19a6b30 KS	315
bbbe503e KS	316	return 0;
	317	error:
	318	return -1;
ea733a2f GKH	319	}
ea733a2f GKH	320
7a947ce5	321	static int rename_net_if(struct udevice *udev)
f61d732a KS	322	{
	323	int sk;
	324	struct ifreq ifr;
	325	int retval;
	326
7a947ce5 KS	327	dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name);
7a947ce5 KS	328	if (udev->test_run)
bbbe503e KS	329	return 0;
bbbe503e KS	330
f61d732a KS	331	sk = socket(PF_INET, SOCK_DGRAM, 0);
	332	if (sk < 0) {
	333	dbg("error opening socket");
	334	return -1;
	335	}
	336
	337	memset(&ifr, 0x00, sizeof(struct ifreq));
7a947ce5 KS	338	strfieldcpy(ifr.ifr_name, udev->kernel_name);
7a947ce5 KS	339	strfieldcpy(ifr.ifr_newname, udev->name);
f61d732a	340
f61d732a KS	341	retval = ioctl(sk, SIOCSIFNAME, &ifr);
	342	if (retval != 0)
	343	dbg("error changing net interface name");
4a539daf	344	close(sk);
f61d732a KS	345
	346	return retval;
	347	}
	348
7a947ce5	349	int udev_add_device(struct udevice udev, struct sysfs_class_device class_dev)
ea733a2f	350	{
bbbe503e	351	char *pos;
707680b1	352	int retval = 0;
ea733a2f	353
7a947ce5 KS	354	if (udev->type == 'b' \|\| udev->type == 'c') {
7a947ce5 KS	355	retval = get_major_minor(class_dev, udev);
f61d732a	356	if (retval != 0) {
707680b1	357	dbg("no dev-file found, do nothing");
5d24c6ca	358	return 0;
f61d732a	359	}
ea733a2f GKH	360	}
ea733a2f GKH	361
7a947ce5	362	if (namedev_name_device(udev, class_dev) != 0)
30defadd GKH	363	goto exit;
30defadd GKH	364
7a947ce5	365	dbg("adding name='%s'", udev->name);
bbbe503e	366
9825617b	367	selinux_init();
5d24c6ca KS	368
5d24c6ca KS	369	if (udev->type == 'b' \|\| udev->type == 'c') {
7a947ce5	370	retval = create_node(udev);
c4603a07	371	if (retval != 0)
bbbe503e	372	goto exit;
9b28a52a	373
5d24c6ca KS	374	if (udevdb_add_dev(udev) != 0)
	375	dbg("udevdb_add_dev failed, but we create the node anyway, "
	376	"remove might not work for custom names");
f61d732a	377
5d24c6ca KS	378	/* use full path to the environment */
	379	snprintf(udev->devname, NAME_SIZE-1, "%s%s", udev_root, udev->name);
	380
	381	} else if (udev->type == 'n') {
	382	/* look if we want to change the name of the netif */
7a947ce5 KS	383	if (strcmp(udev->name, udev->kernel_name) != 0) {
7a947ce5 KS	384	retval = rename_net_if(udev);
c4603a07	385	if (retval != 0)
bbbe503e	386	goto exit;
5d24c6ca KS	387
	388	/* we've changed the name, now fake the devpath,
	389	* cause original kernel name sleeps with the fishes
	390	* and we don't get any event from the kernel now
bbbe503e	391	*/
7a947ce5	392	pos = strrchr(udev->devpath, '/');
bbbe503e KS	393	if (pos != NULL) {
bbbe503e KS	394	pos[1] = '\0';
7a947ce5	395	strfieldcat(udev->devpath, udev->name);
5d24c6ca	396	setenv("DEVPATH", udev->devpath, 1);
bbbe503e	397	}
9b28a52a	398
5d24c6ca KS	399	/* use netif name for the environment */
	400	strfieldcpy(udev->devname, udev->name);
	401	}
f61d732a	402	}
ea733a2f GKH	403
ea733a2f GKH	404	exit:
9825617b	405	selinux_restore();
30defadd	406
ea733a2f GKH	407	return retval;
ea733a2f GKH	408	}