[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>
#ifndef __KLIBC__
#include <pwd.h>
#endif

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

/* 
 * Right now the major/minor of a device is stored in a file called
 * "dev" in sysfs.
 * The number is stored as:
 * 	MM:mm
 * 		MM is the major
 * 		mm is the minor
 * 		The value is in decimal.
 */
static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev)
{
	int retval = -ENODEV;

	char *dev;

	dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
	if (dev == NULL)
		goto exit;

	dbg("dev='%s'", dev);

	if (sscanf(dev, "%u:%u", &udev->major, &udev->minor) != 2)
		goto exit;

	dbg("found major=%d, minor=%d", udev->major, udev->minor);

	retval = 0;
exit:
	return retval;
}

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

/*
 * we possibly want to add some symlinks here
 * only numeric owner/group id's are supported
 */
static int create_node(struct udevice *dev)
{
	char filename[255];
	char linktarget[255];
	int retval = 0;
	uid_t uid = 0;
	gid_t gid = 0;
	dev_t res;
	int i;
	int tail;


	strncpy(filename, udev_root, sizeof(filename));
	strncat(filename, dev->name, sizeof(filename));

#ifdef __KLIBC__
	res = (dev->major << 8) | (dev->minor);
#else
	res = makedev(dev->major, dev->minor);
#endif

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

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

	dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
	retval = mknod(filename, dev->mode, res);
	if (retval)
		dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
		    filename, dev->mode, dev->major, dev->minor, strerror(errno));

	dbg("chmod(%s, %#o)", filename, dev->mode);
	retval = chmod(filename, dev->mode);
	if (retval)
		dbg("chmod(%s, %#o) failed with error '%s'",
		    filename, dev->mode, strerror(errno));

	if (*dev->owner) {
		char *endptr;
		unsigned long id = strtoul(dev->owner, &endptr, 10);
		if (*endptr == 0x00)
			uid = (uid_t) id;
		else {
			struct passwd *pw = getpwnam(dev->owner);
			if (!pw)
				dbg("user unknown '%s'", dev->owner);
			else
				uid = pw->pw_uid;
		}
	}

	if (*dev->group) {
		char *endptr;
		unsigned long id = strtoul(dev->group, &endptr, 10);
		if (*endptr == 0x00)
			gid = (gid_t) id;
		else {
			struct group *gr = getgrnam(dev->group);
			if (!gr)
				dbg("group unknown '%s'", dev->group);
			else
				gid = gr->gr_gid;
		}
	}

	if (uid || gid) {
		dbg("chown(%s, %u, %u)", filename, uid, gid);
		retval = chown(filename, uid, gid);
		if (retval)
			dbg("chown(%s, %u, %u) failed with error '%s'",
			    filename, uid, gid, strerror(errno));
	}


	/* create symlink if requested */
	if (*dev->symlink) {
		strncpy(filename, udev_root, sizeof(filename));
		strncat(filename, dev->symlink, sizeof(filename));
		dbg("symlink '%s' to node '%s' requested", filename, dev->name);
		if (strrchr(dev->symlink, '/'))
			create_path(filename);

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

		if (*linktarget == '\0')
			strcpy(linktarget, "./");
		strcat(linktarget, &dev->name[tail]);

		dbg("symlink(%s, %s)", linktarget, filename);
		retval = symlink(linktarget, filename);
		if (retval)
			dbg("symlink(%s, %s) failed with error '%s'",
			    linktarget, filename, strerror(errno));
	}

	return retval;
}

static struct sysfs_class_device *get_class_dev(char *device_name)
{
	char dev_path[SYSFS_PATH_MAX];
	struct sysfs_class_device *class_dev = NULL;

	strcpy(dev_path, sysfs_path);
	strcat(dev_path, device_name);

	dbg("looking at '%s'", dev_path);

	/* open up the sysfs class device for this thing... */
	class_dev = sysfs_open_class_device(dev_path);
	if (class_dev == NULL) {
		dbg ("sysfs_open_class_device failed");
		goto exit;
	}
	dbg("class_dev->name='%s'", class_dev->name);

exit:
	return class_dev;
}

/* wait for the "dev" file to show up in the directory in sysfs.
 * If it doesn't happen in about 10 seconds, give up.
 */
#define SECONDS_TO_WAIT_FOR_DEV		10
static int sleep_for_dev(char *path)
{
	char filename[SYSFS_PATH_MAX + 6];
	int loop = SECONDS_TO_WAIT_FOR_DEV;
	int retval;

	strcpy(filename, sysfs_path);
	strcat(filename, path);
	strcat(filename, "/dev");

	while (loop--) {
		struct stat buf;

		dbg("looking for '%s'", filename);
		retval = stat(filename, &buf);
		if (!retval)
			goto exit;

		/* sleep to give the kernel a chance to create the dev file */
		sleep(1);
	}
	retval = -ENODEV;
exit:
	return retval;
}

int udev_add_device(char *path, char *subsystem)
{
	struct sysfs_class_device *class_dev = NULL;
	struct udevice dev;
	int retval = -EINVAL;

	memset(&dev, 0x00, sizeof(dev));

	/* for now, the block layer is the only place where block devices are */
	if (strcmp(subsystem, "block") == 0)
		dev.type = 'b';
	else
		dev.type = 'c';

	retval = sleep_for_dev(path);
	if (retval)
		goto exit;

	class_dev = get_class_dev(path);
	if (class_dev == NULL)
		goto exit;

	retval = get_major_minor(class_dev, &dev);
	if (retval) {
		dbg("get_major_minor failed");
		goto exit;
	}

	retval = namedev_name_device(class_dev, &dev);
	if (retval)
		goto exit;

	retval = udevdb_add_dev(path, &dev);
	if (retval != 0)
		dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
		    "But remove might not work properly for this device.");

	dbg("name='%s'", dev.name);
	retval = create_node(&dev);

exit:
	if (class_dev)
		sysfs_close_class_device(class_dev);

	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>
	32	#include <grp.h>
	33	#ifndef __KLIBC__
	34	#include <pwd.h>
	35	#endif
ea733a2f GKH	36
	37	#include "udev.h"
	38	#include "udev_version.h"
	39	#include "namedev.h"
8e41d35d	40	#include "udevdb.h"
ea733a2f	41	#include "libsysfs/libsysfs.h"
10950dfe	42	#include "klibc_fixups.h"
ea733a2f	43
ea733a2f GKH	44	/*
	45	* Right now the major/minor of a device is stored in a file called
	46	* "dev" in sysfs.
	47	* The number is stored as:
727d1ba5	48	* MM:mm
ea733a2f GKH	49	* MM is the major
ea733a2f GKH	50	* mm is the minor
727d1ba5	51	* The value is in decimal.
ea733a2f	52	*/
30defadd	53	static int get_major_minor(struct sysfs_class_device class_dev, struct udevice udev)
ea733a2f	54	{
ea256f90	55	int retval = -ENODEV;
ea733a2f GKH	56
	57	char *dev;
	58
	59	dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
	60	if (dev == NULL)
ea256f90	61	goto exit;
ea733a2f	62
f7b4eca4	63	dbg("dev='%s'", dev);
ea733a2f	64
30defadd	65	if (sscanf(dev, "%u:%u", &udev->major, &udev->minor) != 2)
ea256f90	66	goto exit;
ea733a2f	67
f7b4eca4	68	dbg("found major=%d, minor=%d", udev->major, udev->minor);
ea733a2f GKH	69
ea733a2f GKH	70	retval = 0;
ea256f90	71	exit:
ea733a2f GKH	72	return retval;
	73	}
	74
3d150dfb KS	75	static int create_path(char *file)
	76	{
	77	char p[NAME_SIZE];
	78	char *pos;
	79	int retval;
	80	struct stat stats;
	81
	82	strncpy(p, file, sizeof(p));
	83	pos = strchr(p+1, '/');
	84	while (1) {
	85	pos = strchr(pos+1, '/');
	86	if (pos == NULL)
	87	break;
	88	*pos = 0x00;
	89	if (stat(p, &stats)) {
	90	retval = mkdir(p, 0755);
	91	if (retval) {
	92	dbg("mkdir(%s) failed with error '%s'",
	93	p, strerror(errno));
	94	return retval;
	95	}
	96	dbg("created '%s'", p);
	97	}
	98	*pos = '/';
	99	}
	100	return 0;
	101	}
	102
ea733a2f	103	/*
c19a6b30 KS	104	* we possibly want to add some symlinks here
c19a6b30 KS	105	* only numeric owner/group id's are supported
ea733a2f	106	*/
5840bc63	107	static int create_node(struct udevice *dev)
ea733a2f	108	{
ea733a2f	109	char filename[255];
3d150dfb	110	char linktarget[255];
ea733a2f	111	int retval = 0;
e308ebb7 GKH	112	uid_t uid = 0;
e308ebb7 GKH	113	gid_t gid = 0;
1e959a4b	114	dev_t res;
3d150dfb KS	115	int i;
	116	int tail;
	117
5840bc63	118
c056c514	119	strncpy(filename, udev_root, sizeof(filename));
5840bc63 GKH	120	strncat(filename, dev->name, sizeof(filename));
5840bc63 GKH	121
1e959a4b GKH	122	#ifdef __KLIBC__
	123	res = (dev->major << 8) \| (dev->minor);
	124	#else
	125	res = makedev(dev->major, dev->minor);
	126	#endif
	127
5840bc63	128	switch (dev->type) {
1331c889	129	case 'b':
5840bc63	130	dev->mode \|= S_IFBLK;
1331c889 GKH	131	break;
	132	case 'c':
	133	case 'u':
5840bc63	134	dev->mode \|= S_IFCHR;
1331c889 GKH	135	break;
1331c889 GKH	136	case 'p':
5840bc63	137	dev->mode \|= S_IFIFO;
1331c889 GKH	138	break;
1331c889 GKH	139	default:
5840bc63	140	dbg("unknown node type %c\n", dev->type);
1331c889 GKH	141	return -EINVAL;
1331c889 GKH	142	}
0abf54fc	143
3d150dfb KS	144	/* create parent directories if needed */
	145	if (strrchr(dev->name, '/'))
	146	create_path(filename);
218eae87	147
5840bc63	148	dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor);
1e959a4b	149	retval = mknod(filename, dev->mode, res);
1331c889 GKH	150	if (retval)
1331c889 GKH	151	dbg("mknod(%s, %#o, %u, %u) failed with error '%s'",
5840bc63 GKH	152	filename, dev->mode, dev->major, dev->minor, strerror(errno));
5840bc63 GKH	153
5bd1061c GKH	154	dbg("chmod(%s, %#o)", filename, dev->mode);
	155	retval = chmod(filename, dev->mode);
	156	if (retval)
	157	dbg("chmod(%s, %#o) failed with error '%s'",
	158	filename, dev->mode, strerror(errno));
	159
c19a6b30 KS	160	if (*dev->owner) {
	161	char *endptr;
	162	unsigned long id = strtoul(dev->owner, &endptr, 10);
	163	if (*endptr == 0x00)
	164	uid = (uid_t) id;
10950dfe GKH	165	else {
	166	struct passwd *pw = getpwnam(dev->owner);
	167	if (!pw)
f7b4eca4	168	dbg("user unknown '%s'", dev->owner);
10950dfe GKH	169	else
	170	uid = pw->pw_uid;
	171	}
c19a6b30 KS	172	}
	173
	174	if (*dev->group) {
	175	char *endptr;
	176	unsigned long id = strtoul(dev->group, &endptr, 10);
	177	if (*endptr == 0x00)
	178	gid = (gid_t) id;
10950dfe GKH	179	else {
	180	struct group *gr = getgrnam(dev->group);
	181	if (!gr)
f7b4eca4	182	dbg("group unknown '%s'", dev->group);
10950dfe GKH	183	else
	184	gid = gr->gr_gid;
	185	}
c19a6b30 KS	186	}
	187
	188	if (uid \|\| gid) {
	189	dbg("chown(%s, %u, %u)", filename, uid, gid);
	190	retval = chown(filename, uid, gid);
	191	if (retval)
3d150dfb KS	192	dbg("chown(%s, %u, %u) failed with error '%s'",
	193	filename, uid, gid, strerror(errno));
	194	}
	195
	196
	197	/* create symlink if requested */
	198	if (*dev->symlink) {
	199	strncpy(filename, udev_root, sizeof(filename));
	200	strncat(filename, dev->symlink, sizeof(filename));
	201	dbg("symlink '%s' to node '%s' requested", filename, dev->name);
	202	if (strrchr(dev->symlink, '/'))
	203	create_path(filename);
	204
	205	/* optimize relative link */
	206	linktarget[0] = '\0';
	207	i = 0;
	208	tail = 0;
	209	while ((dev->name[i] == dev->symlink[i]) && dev->name[i]) {
	210	if (dev->name[i] == '/')
	211	tail = i+1;
	212	i++;
	213	}
	214	while (dev->symlink[i]) {
	215	if (dev->symlink[i] == '/')
	216	strcat(linktarget, "../");
	217	i++;
	218	}
	219
	220	if (*linktarget == '\0')
	221	strcpy(linktarget, "./");
	222	strcat(linktarget, &dev->name[tail]);
	223
	224	dbg("symlink(%s, %s)", linktarget, filename);
	225	retval = symlink(linktarget, filename);
	226	if (retval)
	227	dbg("symlink(%s, %s) failed with error '%s'",
	228	linktarget, filename, strerror(errno));
c19a6b30 KS	229	}
c19a6b30 KS	230
ea733a2f GKH	231	return retval;
	232	}
	233
d7e954a4	234	static struct sysfs_class_device get_class_dev(char device_name)
ea733a2f GKH	235	{
ea733a2f GKH	236	char dev_path[SYSFS_PATH_MAX];
63dde9f8 GKH	237	struct sysfs_class_device *class_dev = NULL;
63dde9f8 GKH	238
ea733a2f GKH	239	strcpy(dev_path, sysfs_path);
	240	strcat(dev_path, device_name);
	241
f7b4eca4	242	dbg("looking at '%s'", dev_path);
ea733a2f GKH	243
	244	/* open up the sysfs class device for this thing... */
	245	class_dev = sysfs_open_class_device(dev_path);
	246	if (class_dev == NULL) {
	247	dbg ("sysfs_open_class_device failed");
63dde9f8	248	goto exit;
ea733a2f	249	}
f7b4eca4	250	dbg("class_dev->name='%s'", class_dev->name);
ea733a2f	251
63dde9f8	252	exit:
ea733a2f GKH	253	return class_dev;
	254	}
	255
29fd7e67 GKH	256	/* wait for the "dev" file to show up in the directory in sysfs.
	257	* If it doesn't happen in about 10 seconds, give up.
	258	*/
	259	#define SECONDS_TO_WAIT_FOR_DEV 10
6089318c	260	static int sleep_for_dev(char *path)
29fd7e67 GKH	261	{
29fd7e67 GKH	262	char filename[SYSFS_PATH_MAX + 6];
c332cfc7 RL	263	int loop = SECONDS_TO_WAIT_FOR_DEV;
c332cfc7 RL	264	int retval;
29fd7e67 GKH	265
29fd7e67 GKH	266	strcpy(filename, sysfs_path);
5840bc63	267	strcat(filename, path);
29fd7e67 GKH	268	strcat(filename, "/dev");
29fd7e67 GKH	269
c332cfc7 RL	270	while (loop--) {
	271	struct stat buf;
	272
f7b4eca4	273	dbg("looking for '%s'", filename);
29fd7e67	274	retval = stat(filename, &buf);
c332cfc7	275	if (!retval)
29fd7e67	276	goto exit;
29fd7e67	277
f7b4eca4	278	/* sleep to give the kernel a chance to create the dev file */
29fd7e67 GKH	279	sleep(1);
	280	}
	281	retval = -ENODEV;
	282	exit:
	283	return retval;
	284	}
	285
5840bc63	286	int udev_add_device(char path, char subsystem)
ea733a2f	287	{
30defadd	288	struct sysfs_class_device *class_dev = NULL;
5840bc63	289	struct udevice dev;
ea733a2f GKH	290	int retval = -EINVAL;
ea733a2f GKH	291
f3b04a2e GKH	292	memset(&dev, 0x00, sizeof(dev));
f3b04a2e GKH	293
ea733a2f GKH	294	/* for now, the block layer is the only place where block devices are */
ea733a2f GKH	295	if (strcmp(subsystem, "block") == 0)
5840bc63	296	dev.type = 'b';
ea733a2f	297	else
5840bc63	298	dev.type = 'c';
ea733a2f	299
5840bc63	300	retval = sleep_for_dev(path);
29fd7e67 GKH	301	if (retval)
29fd7e67 GKH	302	goto exit;
63dde9f8	303
5840bc63	304	class_dev = get_class_dev(path);
ea733a2f GKH	305	if (class_dev == NULL)
	306	goto exit;
	307
30defadd	308	retval = get_major_minor(class_dev, &dev);
ea733a2f	309	if (retval) {
ca999860	310	dbg("get_major_minor failed");
ea733a2f GKH	311	goto exit;
	312	}
	313
30defadd GKH	314	retval = namedev_name_device(class_dev, &dev);
	315	if (retval)
	316	goto exit;
	317
5840bc63	318	retval = udevdb_add_dev(path, &dev);
8e41d35d	319	if (retval != 0)
5840bc63	320	dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. "
ca999860 GKH	321	"But remove might not work properly for this device.");
ca999860 GKH	322
f7b4eca4	323	dbg("name='%s'", dev.name);
5840bc63	324	retval = create_node(&dev);
ea733a2f GKH	325
ea733a2f GKH	326	exit:
30defadd GKH	327	if (class_dev)
	328	sysfs_close_class_device(class_dev);
	329
ea733a2f GKH	330	return retval;
ea733a2f GKH	331	}