[thirdparty/systemd.git] / udev / lib / libudev-monitor.c

/*
 * libudev - interface to udev device information
 *
 * Copyright (C) 2008 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, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <linux/netlink.h>

#include "libudev.h"
#include "libudev-private.h"

struct udev_monitor {
	struct udev *udev;
	int refcount;
	int sock;
	struct sockaddr_nl snl;
	struct sockaddr_un sun;
	socklen_t addrlen;
};

/**
 * udev_monitor_new_from_socket:
 * @udev: udev library context
 * @socket_path: unix socket path
 *
 * Create new udev monitor, setup and connect to a specified socket. The
 * path to a socket can point to an existing socket file, or it will be
 * created if needed. If neccessary, the permissions adjustment as well as
 * the later cleanup of the socket file, needs to be done by the caller.
 * If the socket path starts with a '@' character, an abstract namespace
 * socket will be used.
 *
 * The initial refcount is 1, and needs to be decremented to
 * release the ressources of the udev monitor.
 *
 * Returns: a new udev monitor, or #NULL, in case of an error
 **/
struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path)
{
	struct udev_monitor *udev_monitor;

	if (udev == NULL)
		return NULL;
	if (socket_path == NULL)
		return NULL;
	udev_monitor = malloc(sizeof(struct udev_monitor));
	if (udev_monitor == NULL)
		return NULL;
	memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
	udev_monitor->refcount = 1;
	udev_monitor->udev = udev;

	udev_monitor->sun.sun_family = AF_LOCAL;
	strcpy(udev_monitor->sun.sun_path, socket_path);
	udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(udev_monitor->sun.sun_path);

	/* translate leading '@' to abstract namespace */
	if (udev_monitor->sun.sun_path[0] == '@')
		udev_monitor->sun.sun_path[0] = '\0';

	udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
	if (udev_monitor->sock == -1) {
		err(udev, "error getting socket: %m\n");
		free(udev_monitor);
		return NULL;
	}
	info(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
	return udev_monitor;
}

struct udev_monitor *udev_monitor_new_from_netlink(struct udev *udev)
{
	struct udev_monitor *udev_monitor;

	if (udev == NULL)
		return NULL;
	udev_monitor = malloc(sizeof(struct udev_monitor));
	if (udev_monitor == NULL)
		return NULL;
	memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
	udev_monitor->refcount = 1;
	udev_monitor->udev = udev;

	udev_monitor->sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
	if (udev_monitor->sock == -1) {
		err(udev, "error getting socket: %m\n");
		free(udev_monitor);
		return NULL;
	}

	udev_monitor->snl.nl_family = AF_NETLINK;
	udev_monitor->snl.nl_pid = getpid();
	udev_monitor->snl.nl_groups = 1;

	info(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT\n", udev_monitor);
	return udev_monitor;
}

int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
{
	int err;
	const int on = 1;

	if (udev_monitor->snl.nl_family != 0) {
		err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
		if (err < 0) {
			err(udev_monitor->udev, "bind failed: %m\n");
			return err;
		}
		info(udev_monitor->udev, "monitor %p listening on netlink\n", udev_monitor);
	} else if (udev_monitor->sun.sun_family != 0) {
		err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
		if (err < 0) {
			err(udev_monitor->udev, "bind failed: %m\n");
			return err;
		}
		/* enable receiving of the sender credentials */
		setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
		info(udev_monitor->udev, "monitor %p listening on socket\n", udev_monitor);
	}
	return 0;
}

/**
 * udev_monitor_ref:
 * @udev_monitor: udev monitor
 *
 * Take a reference of a udev monitor.
 *
 * Returns: the passed udev monitor
 **/
struct udev_monitor *udev_monitor_ref(struct udev_monitor *udev_monitor)
{
	if (udev_monitor == NULL)
		return NULL;
	udev_monitor->refcount++;
	return udev_monitor;
}

/**
 * udev_monitor_unref:
 * @udev_monitor: udev monitor
 *
 * Drop a reference ofa udev monitor. If the refcount reaches zero,
 * the bound socket will be closed, and the ressources of the monitor
 * will be released.
 *
 **/
void udev_monitor_unref(struct udev_monitor *udev_monitor)
{
	if (udev_monitor == NULL)
		return;
	udev_monitor->refcount--;
	if (udev_monitor->refcount > 0)
		return;
	if (udev_monitor->sock >= 0)
		close(udev_monitor->sock);
	info(udev_monitor->udev, "monitor %p released\n", udev_monitor);
	free(udev_monitor);
}

/**
 * udev_monitor_get_udev:
 * @udev_monitor: udev monitor
 *
 * Retrieve the udev library context the monitor was created with.
 *
 * Returns: the udev library context
 **/
struct udev *udev_monitor_get_udev(struct udev_monitor *udev_monitor)
{
	if (udev_monitor == NULL)
		return NULL;
	return udev_monitor->udev;
}

/**
 * udev_monitor_get_fd:
 * @udev_monitor: udev monitor
 *
 * Retrieve the socket file descriptor associated with the monitor.
 *
 * Returns: the socket file descriptor
 **/
int udev_monitor_get_fd(struct udev_monitor *udev_monitor)
{
	if (udev_monitor == NULL)
		return -1;
	return udev_monitor->sock;
}

/**
 * udev_monitor_receive_device:
 * @udev_monitor: udev monitor
 *
 * Receive data from the udev monitor socket, allocate a new udev
 * device, fill in the received data, and return the device.
 *
 * Only socket connections with uid=0 are accepted. The caller
 * needs to make sure, that there is data to read from the socket,
 * the call will block until the socket becomes readable.
 *
 * The initial refcount is 1, and needs to be decremented to
 * release the ressources of the udev device.
 *
 * Returns: a new udev device, or #NULL, in case of an error
 **/
struct udev_device *udev_monitor_receive_device(struct udev_monitor *udev_monitor)
{
	struct udev_device *udev_device;
	struct msghdr smsg;
	struct iovec iov;
	char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
	char buf[4096];
	size_t bufpos;
	int maj = 0;
	int min = 0;

	if (udev_monitor == NULL)
		return NULL;
	memset(buf, 0x00, sizeof(buf));
	iov.iov_base = &buf;
	iov.iov_len = sizeof(buf);
	memset (&smsg, 0x00, sizeof(struct msghdr));
	smsg.msg_iov = &iov;
	smsg.msg_iovlen = 1;
	smsg.msg_control = cred_msg;
	smsg.msg_controllen = sizeof(cred_msg);

	if (recvmsg(udev_monitor->sock, &smsg, 0) < 0) {
		if (errno != EINTR)
			info(udev_monitor->udev, "unable to receive message");
		return NULL;
	}

	if (udev_monitor->sun.sun_family != 0) {
		struct cmsghdr *cmsg = CMSG_FIRSTHDR(&smsg);
		struct ucred *cred = (struct ucred *)CMSG_DATA (cmsg);

		if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
			info(udev_monitor->udev, "no sender credentials received, message ignored");
			return NULL;
		}

		if (cred->uid != 0) {
			info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
			return NULL;
		}
	}

	/* skip header */
	bufpos = strlen(buf) + 1;
	if (bufpos < sizeof("a@/d") || bufpos >= sizeof(buf)) {
		info(udev_monitor->udev, "invalid message length");
		return NULL;
	}

	/* check message header */
	if (strstr(buf, "@/") == NULL) {
		info(udev_monitor->udev, "unrecognized message header");
		return NULL;
	}

	udev_device = device_new(udev_monitor->udev);
	if (udev_device == NULL) {
		return NULL;
	}

	while (bufpos < sizeof(buf)) {
		char *key;
		size_t keylen;

		key = &buf[bufpos];
		keylen = strlen(key);
		if (keylen == 0)
			break;
		bufpos += keylen + 1;

		if (strncmp(key, "DEVPATH=", 8) == 0) {
			char path[UTIL_PATH_SIZE];

			util_strlcpy(path, udev_get_sys_path(udev_monitor->udev), sizeof(path));
			util_strlcat(path, &key[8], sizeof(path));
			udev_device_set_syspath(udev_device, path);
		} else if (strncmp(key, "SUBSYSTEM=", 10) == 0) {
			udev_device_set_subsystem(udev_device, &key[10]);
		} else if (strncmp(key, "DEVNAME=", 8) == 0) {
			udev_device_set_devnode(udev_device, &key[8]);
		} else if (strncmp(key, "DEVLINKS=", 9) == 0) {
			char *slink = &key[9];
			char *next = strchr(slink, ' ');

			while (next != NULL) {
				next[0] = '\0';
				udev_device_add_devlink(udev_device, slink);
				slink = &next[1];
				next = strchr(slink, ' ');
			}
			if (slink[0] != '\0')
				udev_device_add_devlink(udev_device, slink);
		} else if (strncmp(key, "DRIVER=", 7) == 0) {
			udev_device_set_driver(udev_device, &key[7]);
		} else if (strncmp(key, "ACTION=", 7) == 0) {
			udev_device_set_action(udev_device, &key[7]);
		} else if (strncmp(key, "MAJOR=", 6) == 0) {
			maj = strtoull(&key[6], NULL, 10);
		} else if (strncmp(key, "MINOR=", 6) == 0) {
			min = strtoull(&key[6], NULL, 10);
		} else if (strncmp(key, "DEVPATH_OLD=", 12) == 0) {
			udev_device_set_devpath_old(udev_device, &key[12]);
		} else if (strncmp(key, "PHYSDEVPATH=", 12) == 0) {
			udev_device_set_physdevpath(udev_device, &key[12]);
		} else if (strncmp(key, "SEQNUM=", 7) == 0) {
			udev_device_set_seqnum(udev_device, strtoull(&key[7], NULL, 10));
		} else if (strncmp(key, "TIMEOUT=", 8) == 0) {
			udev_device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
		}
		if (strncmp(key, "PHYSDEV", 7) == 0)
			continue;
		udev_device_add_property_from_string(udev_device, key);
	}
	udev_device_set_devnum(udev_device, makedev(maj, min));

	udev_device_set_info_loaded(udev_device);
	return udev_device;
}
Commit	Line	Data
ba6929f6 KS	1	/*
	2	* libudev - interface to udev device information
	3	*
	4	* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
	5	*
	6	* This program is free software: you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation, either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
ba6929f6 KS	20	#include <stdio.h>
	21	#include <stdlib.h>
	22	#include <stddef.h>
	23	#include <unistd.h>
	24	#include <errno.h>
	25	#include <string.h>
	26	#include <dirent.h>
	27	#include <sys/stat.h>
	28	#include <sys/socket.h>
	29	#include <sys/un.h>
1c7047ea	30	#include <linux/netlink.h>
ba6929f6 KS	31
	32	#include "libudev.h"
	33	#include "libudev-private.h"
ba6929f6 KS	34
	35	struct udev_monitor {
	36	struct udev *udev;
	37	int refcount;
d59f11e1	38	int sock;
1c7047ea KS	39	struct sockaddr_nl snl;
1c7047ea KS	40	struct sockaddr_un sun;
d59f11e1	41	socklen_t addrlen;
ba6929f6 KS	42	};
ba6929f6 KS	43
7d8787b3 KS	44	/**
	45	* udev_monitor_new_from_socket:
	46	* @udev: udev library context
	47	* @socket_path: unix socket path
	48	*
	49	* Create new udev monitor, setup and connect to a specified socket. The
	50	* path to a socket can point to an existing socket file, or it will be
	51	* created if needed. If neccessary, the permissions adjustment as well as
	52	* the later cleanup of the socket file, needs to be done by the caller.
	53	* If the socket path starts with a '@' character, an abstract namespace
	54	* socket will be used.
	55	*
	56	* The initial refcount is 1, and needs to be decremented to
	57	* release the ressources of the udev monitor.
	58	*
	59	* Returns: a new udev monitor, or #NULL, in case of an error
	60	**/
ba6929f6 KS	61	struct udev_monitor udev_monitor_new_from_socket(struct udev udev, const char *socket_path)
	62	{
	63	struct udev_monitor *udev_monitor;
ba6929f6 KS	64
	65	if (udev == NULL)
	66	return NULL;
	67	if (socket_path == NULL)
	68	return NULL;
	69	udev_monitor = malloc(sizeof(struct udev_monitor));
	70	if (udev_monitor == NULL)
	71	return NULL;
	72	memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
	73	udev_monitor->refcount = 1;
	74	udev_monitor->udev = udev;
	75
1c7047ea KS	76	udev_monitor->sun.sun_family = AF_LOCAL;
	77	strcpy(udev_monitor->sun.sun_path, socket_path);
	78	udev_monitor->addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(udev_monitor->sun.sun_path);
ba6929f6 KS	79
ba6929f6 KS	80	/* translate leading '@' to abstract namespace */
1c7047ea KS	81	if (udev_monitor->sun.sun_path[0] == '@')
1c7047ea KS	82	udev_monitor->sun.sun_path[0] = '\0';
ba6929f6	83
d59f11e1 KS	84	udev_monitor->sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
d59f11e1 KS	85	if (udev_monitor->sock == -1) {
659353f5	86	err(udev, "error getting socket: %m\n");
ba6929f6 KS	87	free(udev_monitor);
	88	return NULL;
	89	}
c4f5f942	90	info(udev, "monitor %p created with '%s'\n", udev_monitor, socket_path);
d59f11e1 KS	91	return udev_monitor;
d59f11e1 KS	92	}
ba6929f6	93
1c7047ea KS	94	struct udev_monitor udev_monitor_new_from_netlink(struct udev udev)
	95	{
	96	struct udev_monitor *udev_monitor;
	97
	98	if (udev == NULL)
	99	return NULL;
	100	udev_monitor = malloc(sizeof(struct udev_monitor));
	101	if (udev_monitor == NULL)
	102	return NULL;
	103	memset(udev_monitor, 0x00, sizeof(struct udev_monitor));
	104	udev_monitor->refcount = 1;
	105	udev_monitor->udev = udev;
	106
	107	udev_monitor->sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
	108	if (udev_monitor->sock == -1) {
659353f5	109	err(udev, "error getting socket: %m\n");
1c7047ea KS	110	free(udev_monitor);
	111	return NULL;
	112	}
	113
	114	udev_monitor->snl.nl_family = AF_NETLINK;
	115	udev_monitor->snl.nl_pid = getpid();
	116	udev_monitor->snl.nl_groups = 1;
	117
	118	info(udev, "monitor %p created with NETLINK_KOBJECT_UEVENT\n", udev_monitor);
	119	return udev_monitor;
	120	}
	121
d59f11e1 KS	122	int udev_monitor_enable_receiving(struct udev_monitor *udev_monitor)
	123	{
	124	int err;
	125	const int on = 1;
	126
1c7047ea KS	127	if (udev_monitor->snl.nl_family != 0) {
	128	err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->snl, sizeof(struct sockaddr_nl));
	129	if (err < 0) {
659353f5	130	err(udev_monitor->udev, "bind failed: %m\n");
1c7047ea KS	131	return err;
	132	}
	133	info(udev_monitor->udev, "monitor %p listening on netlink\n", udev_monitor);
	134	} else if (udev_monitor->sun.sun_family != 0) {
	135	err = bind(udev_monitor->sock, (struct sockaddr *)&udev_monitor->sun, udev_monitor->addrlen);
	136	if (err < 0) {
659353f5	137	err(udev_monitor->udev, "bind failed: %m\n");
1c7047ea KS	138	return err;
	139	}
	140	/* enable receiving of the sender credentials */
	141	setsockopt(udev_monitor->sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof(on));
	142	info(udev_monitor->udev, "monitor %p listening on socket\n", udev_monitor);
ba6929f6	143	}
d59f11e1	144	return 0;
ba6929f6 KS	145	}
ba6929f6 KS	146
7d8787b3 KS	147	/**
	148	* udev_monitor_ref:
	149	* @udev_monitor: udev monitor
	150	*
	151	* Take a reference of a udev monitor.
	152	*
	153	* Returns: the passed udev monitor
	154	**/
ba6929f6 KS	155	struct udev_monitor udev_monitor_ref(struct udev_monitor udev_monitor)
	156	{
	157	if (udev_monitor == NULL)
	158	return NULL;
	159	udev_monitor->refcount++;
	160	return udev_monitor;
	161	}
	162
7d8787b3 KS	163	/**
	164	* udev_monitor_unref:
	165	* @udev_monitor: udev monitor
	166	*
d59f11e1	167	* Drop a reference ofa udev monitor. If the refcount reaches zero,
7d8787b3 KS	168	* the bound socket will be closed, and the ressources of the monitor
	169	* will be released.
	170	*
	171	**/
ba6929f6 KS	172	void udev_monitor_unref(struct udev_monitor *udev_monitor)
	173	{
	174	if (udev_monitor == NULL)
	175	return;
	176	udev_monitor->refcount--;
	177	if (udev_monitor->refcount > 0)
	178	return;
d59f11e1 KS	179	if (udev_monitor->sock >= 0)
d59f11e1 KS	180	close(udev_monitor->sock);
c4f5f942	181	info(udev_monitor->udev, "monitor %p released\n", udev_monitor);
ba6929f6 KS	182	free(udev_monitor);
	183	}
	184
7d8787b3 KS	185	/**
	186	* udev_monitor_get_udev:
	187	* @udev_monitor: udev monitor
	188	*
b98fd840	189	* Retrieve the udev library context the monitor was created with.
7d8787b3 KS	190	*
	191	* Returns: the udev library context
	192	**/
ba6929f6 KS	193	struct udev udev_monitor_get_udev(struct udev_monitor udev_monitor)
	194	{
	195	if (udev_monitor == NULL)
	196	return NULL;
	197	return udev_monitor->udev;
	198	}
	199
7d8787b3 KS	200	/**
	201	* udev_monitor_get_fd:
	202	* @udev_monitor: udev monitor
	203	*
	204	* Retrieve the socket file descriptor associated with the monitor.
	205	*
	206	* Returns: the socket file descriptor
	207	**/
ba6929f6 KS	208	int udev_monitor_get_fd(struct udev_monitor *udev_monitor)
	209	{
	210	if (udev_monitor == NULL)
	211	return -1;
d59f11e1	212	return udev_monitor->sock;
ba6929f6 KS	213	}
ba6929f6 KS	214
7d8787b3	215	/**
d59f11e1	216	* udev_monitor_receive_device:
7d8787b3 KS	217	* @udev_monitor: udev monitor
7d8787b3 KS	218	*
d59f11e1	219	* Receive data from the udev monitor socket, allocate a new udev
b98fd840	220	* device, fill in the received data, and return the device.
7d8787b3 KS	221	*
7d8787b3 KS	222	* Only socket connections with uid=0 are accepted. The caller
b98fd840	223	* needs to make sure, that there is data to read from the socket,
7d8787b3 KS	224	* the call will block until the socket becomes readable.
	225	*
	226	* The initial refcount is 1, and needs to be decremented to
	227	* release the ressources of the udev device.
	228	*
	229	* Returns: a new udev device, or #NULL, in case of an error
	230	**/
d59f11e1	231	struct udev_device udev_monitor_receive_device(struct udev_monitor udev_monitor)
ba6929f6 KS	232	{
	233	struct udev_device *udev_device;
	234	struct msghdr smsg;
ba6929f6	235	struct iovec iov;
ba6929f6 KS	236	char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
	237	char buf[4096];
	238	size_t bufpos;
37372bbc KS	239	int maj = 0;
37372bbc KS	240	int min = 0;
ba6929f6 KS	241
	242	if (udev_monitor == NULL)
	243	return NULL;
	244	memset(buf, 0x00, sizeof(buf));
	245	iov.iov_base = &buf;
	246	iov.iov_len = sizeof(buf);
	247	memset (&smsg, 0x00, sizeof(struct msghdr));
	248	smsg.msg_iov = &iov;
	249	smsg.msg_iovlen = 1;
	250	smsg.msg_control = cred_msg;
	251	smsg.msg_controllen = sizeof(cred_msg);
	252
d59f11e1	253	if (recvmsg(udev_monitor->sock, &smsg, 0) < 0) {
ba6929f6	254	if (errno != EINTR)
7d563a17	255	info(udev_monitor->udev, "unable to receive message");
ba6929f6 KS	256	return NULL;
ba6929f6 KS	257	}
ba6929f6	258
1c7047ea KS	259	if (udev_monitor->sun.sun_family != 0) {
	260	struct cmsghdr *cmsg = CMSG_FIRSTHDR(&smsg);
	261	struct ucred cred = (struct ucred )CMSG_DATA (cmsg);
ba6929f6	262
1c7047ea KS	263	if (cmsg == NULL \|\| cmsg->cmsg_type != SCM_CREDENTIALS) {
	264	info(udev_monitor->udev, "no sender credentials received, message ignored");
	265	return NULL;
	266	}
	267
	268	if (cred->uid != 0) {
	269	info(udev_monitor->udev, "sender uid=%d, message ignored", cred->uid);
	270	return NULL;
	271	}
ba6929f6 KS	272	}
	273
	274	/* skip header */
	275	bufpos = strlen(buf) + 1;
	276	if (bufpos < sizeof("a@/d") \|\| bufpos >= sizeof(buf)) {
7d563a17	277	info(udev_monitor->udev, "invalid message length");
ba6929f6 KS	278	return NULL;
	279	}
	280
	281	/* check message header */
	282	if (strstr(buf, "@/") == NULL) {
7d563a17	283	info(udev_monitor->udev, "unrecognized message header");
ba6929f6 KS	284	return NULL;
	285	}
	286
e0083e8e	287	udev_device = device_new(udev_monitor->udev);
ba6929f6 KS	288	if (udev_device == NULL) {
	289	return NULL;
	290	}
	291
	292	while (bufpos < sizeof(buf)) {
	293	char *key;
	294	size_t keylen;
	295
	296	key = &buf[bufpos];
	297	keylen = strlen(key);
	298	if (keylen == 0)
	299	break;
	300	bufpos += keylen + 1;
	301
	302	if (strncmp(key, "DEVPATH=", 8) == 0) {
8753fadf KS	303	char path[UTIL_PATH_SIZE];
	304
	305	util_strlcpy(path, udev_get_sys_path(udev_monitor->udev), sizeof(path));
	306	util_strlcat(path, &key[8], sizeof(path));
8cd2e972	307	udev_device_set_syspath(udev_device, path);
ba6929f6	308	} else if (strncmp(key, "SUBSYSTEM=", 10) == 0) {
8cd2e972	309	udev_device_set_subsystem(udev_device, &key[10]);
ba6929f6	310	} else if (strncmp(key, "DEVNAME=", 8) == 0) {
8cd2e972	311	udev_device_set_devnode(udev_device, &key[8]);
ba6929f6 KS	312	} else if (strncmp(key, "DEVLINKS=", 9) == 0) {
	313	char *slink = &key[9];
	314	char *next = strchr(slink, ' ');
	315
	316	while (next != NULL) {
	317	next[0] = '\0';
8cd2e972	318	udev_device_add_devlink(udev_device, slink);
ba6929f6 KS	319	slink = &next[1];
	320	next = strchr(slink, ' ');
	321	}
	322	if (slink[0] != '\0')
8cd2e972	323	udev_device_add_devlink(udev_device, slink);
37372bbc	324	} else if (strncmp(key, "DRIVER=", 7) == 0) {
8cd2e972	325	udev_device_set_driver(udev_device, &key[7]);
37372bbc	326	} else if (strncmp(key, "ACTION=", 7) == 0) {
8cd2e972	327	udev_device_set_action(udev_device, &key[7]);
37372bbc KS	328	} else if (strncmp(key, "MAJOR=", 6) == 0) {
	329	maj = strtoull(&key[6], NULL, 10);
	330	} else if (strncmp(key, "MINOR=", 6) == 0) {
	331	min = strtoull(&key[6], NULL, 10);
	332	} else if (strncmp(key, "DEVPATH_OLD=", 12) == 0) {
8cd2e972	333	udev_device_set_devpath_old(udev_device, &key[12]);
37372bbc	334	} else if (strncmp(key, "PHYSDEVPATH=", 12) == 0) {
8cd2e972	335	udev_device_set_physdevpath(udev_device, &key[12]);
37372bbc	336	} else if (strncmp(key, "SEQNUM=", 7) == 0) {
8cd2e972	337	udev_device_set_seqnum(udev_device, strtoull(&key[7], NULL, 10));
37372bbc	338	} else if (strncmp(key, "TIMEOUT=", 8) == 0) {
8cd2e972	339	udev_device_set_timeout(udev_device, strtoull(&key[8], NULL, 10));
ba6929f6	340	}
8753fadf KS	341	if (strncmp(key, "PHYSDEV", 7) == 0)
8753fadf KS	342	continue;
8cd2e972	343	udev_device_add_property_from_string(udev_device, key);
ba6929f6	344	}
8cd2e972	345	udev_device_set_devnum(udev_device, makedev(maj, min));
ba6929f6	346
8cd2e972	347	udev_device_set_info_loaded(udev_device);
ba6929f6 KS	348	return udev_device;
ba6929f6 KS	349	}