[thirdparty/systemd.git] / udev / udev-event.c

/*
 * Copyright (C) 2004-2008 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 <stdlib.h>
#include <stdio.h>
#include <stddef.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <linux/sockios.h>

#include "udev.h"

struct udev_event *udev_event_new(struct udev_device *dev)
{
	struct udev_event *event;

	event = malloc(sizeof(struct udev_event));
	if (event == NULL)
		return NULL;
	memset(event, 0x00, sizeof(struct udev_event));

	event->dev = dev;
	event->udev = udev_device_get_udev(dev);
	udev_list_init(&event->run_list);
	event->mode = 0660;
	util_strlcpy(event->owner, "0", sizeof(event->owner));
	util_strlcpy(event->group, "0", sizeof(event->group));

	dbg(event->udev, "allocated event %p\n", event);
	return event;
}

void udev_event_unref(struct udev_event *event)
{
	udev_list_cleanup(event->udev, &event->run_list);
	dbg(event->udev, "free event %p\n", event);
	free(event);
}

static void kernel_log(struct ifreq ifr)
{
	int klog;
	FILE *f;

	klog = open("/dev/kmsg", O_WRONLY);
	if (klog < 0)
		return;

	f = fdopen(klog, "w");
	if (f == NULL) {
		close(klog);
		return;
	}

	fprintf(f, "<6>udev: renamed network interface %s to %s\n",
		ifr.ifr_name, ifr.ifr_newname);
	fclose(f);
}

static int rename_netif(struct udev_event *event)
{
	struct udev_device *dev = event->dev;
	int sk;
	struct ifreq ifr;
	int err;

	info(event->udev, "changing net interface name from '%s' to '%s'\n",
	     udev_device_get_sysname(dev), event->name);
	if (event->test)
		return 0;

	sk = socket(PF_INET, SOCK_DGRAM, 0);
	if (sk < 0) {
		err(event->udev, "error opening socket: %m\n");
		return -1;
	}

	memset(&ifr, 0x00, sizeof(struct ifreq));
	util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
	util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
	err = ioctl(sk, SIOCSIFNAME, &ifr);
	if (err == 0)
		kernel_log(ifr);
	else {
		int loop;

		/* see if the destination interface name already exists */
		if (errno != EEXIST) {
			err(event->udev, "error changing netif name %s to %s: %m\n",
			    ifr.ifr_name, ifr.ifr_newname);
			goto exit;
		}

		/* free our own name, another process may wait for us */
		util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
		util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
		err = ioctl(sk, SIOCSIFNAME, &ifr);
		if (err != 0) {
			err(event->udev, "error changing netif name %s to %s: %m\n",
			    ifr.ifr_name, ifr.ifr_newname);
			goto exit;
		}

		/* wait 30 seconds for our target to become available */
		util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
		util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
		loop = 30 * 20;
		while (loop--) {
			err = ioctl(sk, SIOCSIFNAME, &ifr);
			if (err == 0) {
				kernel_log(ifr);
				break;
			}

			if (errno != EEXIST) {
				err(event->udev, "error changing net interface name %s to %s: %m\n",
				    ifr.ifr_name, ifr.ifr_newname);
				break;
			}
			dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
			    udev_device_get_devnode(dev), (30 * 20) - loop);
			usleep(1000 * 1000 / 20);
		}
	}

exit:
	close(sk);
	return err;
}

int udev_event_run(struct udev_event *event, struct udev_rules *rules)
{
	struct udev_device *dev = event->dev;
	int err = 0;

	if (udev_device_get_devpath_old(dev) != NULL) {
		if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
			info(event->udev, "moved database from '%s' to '%s'\n",
			     udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
	}

	/* add device node */
	if (major(udev_device_get_devnum(dev)) != 0 &&
	    (strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
		char filename[UTIL_PATH_SIZE];
		struct udev_device *dev_old;

		dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));

		udev_rules_get_name(rules, event);
		if (event->ignore_device) {
			info(event->udev, "device event will be ignored\n");
			goto exit;
		}

		if (event->name[0] == '\0') {
			info(event->udev, "device node creation supressed\n");
			goto exit;
		}

		/* set device node name */
		util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
		util_strlcat(filename, "/", sizeof(filename));
		util_strlcat(filename, event->name, sizeof(filename));
		udev_device_set_devnode(dev, filename);

		/* read current database entry; cleanup, if it is known device */
		dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
		if (dev_old != NULL) {
			info(event->udev, "device '%s' already in database, updating\n",
			     udev_device_get_devpath(dev));
			udev_node_update_old_links(dev, dev_old, event->test);
			udev_device_unref(dev_old);
		}

		udev_device_update_db(dev);

		err = udev_node_add(dev, event->mode, event->owner, event->group, event->test);
		if (err != 0)
			goto exit;

		goto exit;
	}

	/* add netif */
	if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
		dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));

		udev_rules_get_name(rules, event);
		if (event->ignore_device) {
			info(event->udev, "device event will be ignored\n");
			goto exit;
		}
		if (event->name[0] == '\0') {
			info(event->udev, "device renaming supressed\n");
			goto exit;
		}

		/* look if we want to change the name of the netif */
		if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
			char syspath[UTIL_PATH_SIZE];
			char *pos;

			err = rename_netif(event);
			if (err != 0)
				goto exit;
			info(event->udev, "renamed netif to '%s'\n", event->name);

			/* remember old name */
			udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));

			/* now change the devpath, because the kernel device name has changed */
			util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
			pos = strrchr(syspath, '/');
			if (pos != NULL) {
				pos[1] = '\0';
				util_strlcat(syspath, event->name, sizeof(syspath));
				udev_device_set_syspath(event->dev, syspath);
				udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
				info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
			}
		}
		goto exit;
	}

	/* remove device node */
	if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
		/* import database entry and delete it */
		udev_device_read_db(dev);
		if (!event->test)
			udev_device_delete_db(dev);

		if (udev_device_get_devnode(dev) == NULL) {
			char devnode[UTIL_PATH_SIZE];

			info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
			     udev_device_get_syspath(dev), udev_device_get_sysname(dev));
			util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
			util_strlcat(devnode, "/", sizeof(devnode));
			util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
			udev_device_set_devnode(dev, devnode);
		}

		udev_rules_get_run(rules, event);
		if (event->ignore_device) {
			info(event->udev, "device event will be ignored\n");
			goto exit;
		}

		if (udev_device_get_ignore_remove(dev)) {
			info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
			goto exit;
		}

		err = udev_node_remove(dev, event->test);
		goto exit;
	}

	/* default devices */
	udev_rules_get_run(rules, event);
	if (event->ignore_device)
		info(event->udev, "device event will be ignored\n");
exit:
	return err;
}
Commit	Line	Data
d46f37fd	1	/*
55e9959b	2	* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
d46f37fd	3	*
55e9959b KS	4	* This program is free software: you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
d46f37fd	8	*
55e9959b KS	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
d46f37fd KS	16	*/
d46f37fd KS	17
d46f37fd KS	18	#include <stdlib.h>
	19	#include <stdio.h>
	20	#include <stddef.h>
	21	#include <unistd.h>
	22	#include <fcntl.h>
	23	#include <errno.h>
	24	#include <ctype.h>
	25	#include <string.h>
	26	#include <sys/ioctl.h>
	27	#include <sys/socket.h>
	28	#include <net/if.h>
	29	#include <linux/sockios.h>
	30
	31	#include "udev.h"
d46f37fd	32
aa8734ff KS	33	struct udev_event udev_event_new(struct udev_device dev)
	34	{
	35	struct udev_event *event;
	36
	37	event = malloc(sizeof(struct udev_event));
	38	if (event == NULL)
	39	return NULL;
	40	memset(event, 0x00, sizeof(struct udev_event));
	41
	42	event->dev = dev;
	43	event->udev = udev_device_get_udev(dev);
	44	udev_list_init(&event->run_list);
	45	event->mode = 0660;
	46	util_strlcpy(event->owner, "0", sizeof(event->owner));
	47	util_strlcpy(event->group, "0", sizeof(event->group));
	48
	49	dbg(event->udev, "allocated event %p\n", event);
	50	return event;
	51	}
	52
	53	void udev_event_unref(struct udev_event *event)
	54	{
	55	udev_list_cleanup(event->udev, &event->run_list);
	56	dbg(event->udev, "free event %p\n", event);
	57	free(event);
	58	}
	59
d46f37fd KS	60	static void kernel_log(struct ifreq ifr)
	61	{
	62	int klog;
	63	FILE *f;
	64
	65	klog = open("/dev/kmsg", O_WRONLY);
	66	if (klog < 0)
	67	return;
	68
	69	f = fdopen(klog, "w");
	70	if (f == NULL) {
	71	close(klog);
	72	return;
	73	}
	74
	75	fprintf(f, "<6>udev: renamed network interface %s to %s\n",
	76	ifr.ifr_name, ifr.ifr_newname);
	77	fclose(f);
	78	}
	79
aa8734ff	80	static int rename_netif(struct udev_event *event)
d46f37fd	81	{
aa8734ff	82	struct udev_device *dev = event->dev;
d46f37fd KS	83	int sk;
d46f37fd KS	84	struct ifreq ifr;
aa8734ff	85	int err;
d46f37fd	86
aa8734ff KS	87	info(event->udev, "changing net interface name from '%s' to '%s'\n",
	88	udev_device_get_sysname(dev), event->name);
	89	if (event->test)
d46f37fd KS	90	return 0;
	91
	92	sk = socket(PF_INET, SOCK_DGRAM, 0);
	93	if (sk < 0) {
aa8734ff	94	err(event->udev, "error opening socket: %m\n");
d46f37fd KS	95	return -1;
	96	}
	97
	98	memset(&ifr, 0x00, sizeof(struct ifreq));
aa8734ff KS	99	util_strlcpy(ifr.ifr_name, udev_device_get_sysname(dev), IFNAMSIZ);
	100	util_strlcpy(ifr.ifr_newname, event->name, IFNAMSIZ);
	101	err = ioctl(sk, SIOCSIFNAME, &ifr);
	102	if (err == 0)
d46f37fd KS	103	kernel_log(ifr);
	104	else {
	105	int loop;
	106
	107	/* see if the destination interface name already exists */
	108	if (errno != EEXIST) {
aa8734ff	109	err(event->udev, "error changing netif name %s to %s: %m\n",
659353f5	110	ifr.ifr_name, ifr.ifr_newname);
d46f37fd KS	111	goto exit;
	112	}
	113
	114	/* free our own name, another process may wait for us */
aa8734ff	115	util_strlcpy(ifr.ifr_newname, udev_device_get_sysname(dev), IFNAMSIZ);
31c1f537	116	util_strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
aa8734ff KS	117	err = ioctl(sk, SIOCSIFNAME, &ifr);
	118	if (err != 0) {
	119	err(event->udev, "error changing netif name %s to %s: %m\n",
659353f5	120	ifr.ifr_name, ifr.ifr_newname);
d46f37fd KS	121	goto exit;
	122	}
	123
	124	/* wait 30 seconds for our target to become available */
31c1f537	125	util_strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
aa8734ff	126	util_strlcpy(ifr.ifr_newname, udev_device_get_devnode(dev), IFNAMSIZ);
d46f37fd KS	127	loop = 30 * 20;
d46f37fd KS	128	while (loop--) {
aa8734ff KS	129	err = ioctl(sk, SIOCSIFNAME, &ifr);
aa8734ff KS	130	if (err == 0) {
d46f37fd KS	131	kernel_log(ifr);
	132	break;
	133	}
	134
	135	if (errno != EEXIST) {
aa8734ff	136	err(event->udev, "error changing net interface name %s to %s: %m\n",
659353f5	137	ifr.ifr_name, ifr.ifr_newname);
d46f37fd KS	138	break;
d46f37fd KS	139	}
aa8734ff KS	140	dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
aa8734ff KS	141	udev_device_get_devnode(dev), (30 * 20) - loop);
d46f37fd KS	142	usleep(1000 * 1000 / 20);
	143	}
	144	}
	145
	146	exit:
	147	close(sk);
aa8734ff	148	return err;
d46f37fd KS	149	}
d46f37fd KS	150
aa8734ff	151	int udev_event_run(struct udev_event event, struct udev_rules rules)
d46f37fd	152	{
aa8734ff KS	153	struct udev_device *dev = event->dev;
aa8734ff KS	154	int err = 0;
d46f37fd	155
aa8734ff KS	156	if (udev_device_get_devpath_old(dev) != NULL) {
	157	if (udev_device_rename_db(dev, udev_device_get_devpath(dev)) == 0)
	158	info(event->udev, "moved database from '%s' to '%s'\n",
	159	udev_device_get_devpath_old(dev), udev_device_get_devpath(dev));
	160	}
d46f37fd KS	161
d46f37fd KS	162	/* add device node */
aa8734ff KS	163	if (major(udev_device_get_devnum(dev)) != 0 &&
	164	(strcmp(udev_device_get_action(dev), "add") == 0 \|\| strcmp(udev_device_get_action(dev), "change") == 0)) {
	165	char filename[UTIL_PATH_SIZE];
	166	struct udev_device *dev_old;
d46f37fd	167
aa8734ff	168	dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
d46f37fd	169
aa8734ff KS	170	udev_rules_get_name(rules, event);
	171	if (event->ignore_device) {
	172	info(event->udev, "device event will be ignored\n");
d46f37fd KS	173	goto exit;
d46f37fd KS	174	}
aa8734ff KS	175
	176	if (event->name[0] == '\0') {
	177	info(event->udev, "device node creation supressed\n");
d46f37fd KS	178	goto exit;
	179	}
	180
aa8734ff KS	181	/* set device node name */
	182	util_strlcpy(filename, udev_get_dev_path(event->udev), sizeof(filename));
	183	util_strlcat(filename, "/", sizeof(filename));
	184	util_strlcat(filename, event->name, sizeof(filename));
	185	udev_device_set_devnode(dev, filename);
	186
d46f37fd	187	/* read current database entry; cleanup, if it is known device */
aa8734ff KS	188	dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
	189	if (dev_old != NULL) {
	190	info(event->udev, "device '%s' already in database, updating\n",
	191	udev_device_get_devpath(dev));
	192	udev_node_update_old_links(dev, dev_old, event->test);
	193	udev_device_unref(dev_old);
d46f37fd KS	194	}
d46f37fd KS	195
aa8734ff	196	udev_device_update_db(dev);
d46f37fd	197
aa8734ff KS	198	err = udev_node_add(dev, event->mode, event->owner, event->group, event->test);
	199	if (err != 0)
	200	goto exit;
d46f37fd	201
d46f37fd KS	202	goto exit;
	203	}
	204
	205	/* add netif */
aa8734ff KS	206	if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
	207	dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
	208
	209	udev_rules_get_name(rules, event);
	210	if (event->ignore_device) {
	211	info(event->udev, "device event will be ignored\n");
d46f37fd KS	212	goto exit;
d46f37fd KS	213	}
aa8734ff KS	214	if (event->name[0] == '\0') {
aa8734ff KS	215	info(event->udev, "device renaming supressed\n");
d46f37fd KS	216	goto exit;
	217	}
	218
	219	/* look if we want to change the name of the netif */
aa8734ff KS	220	if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
aa8734ff KS	221	char syspath[UTIL_PATH_SIZE];
d46f37fd KS	222	char *pos;
d46f37fd KS	223
aa8734ff KS	224	err = rename_netif(event);
aa8734ff KS	225	if (err != 0)
d46f37fd	226	goto exit;
aa8734ff	227	info(event->udev, "renamed netif to '%s'\n", event->name);
d46f37fd	228
aa8734ff KS	229	/* remember old name */
aa8734ff KS	230	udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
d46f37fd KS	231
d46f37fd KS	232	/* now change the devpath, because the kernel device name has changed */
aa8734ff KS	233	util_strlcpy(syspath, udev_device_get_syspath(dev), sizeof(syspath));
aa8734ff KS	234	pos = strrchr(syspath, '/');
d46f37fd KS	235	if (pos != NULL) {
d46f37fd KS	236	pos[1] = '\0';
aa8734ff KS	237	util_strlcat(syspath, event->name, sizeof(syspath));
	238	udev_device_set_syspath(event->dev, syspath);
	239	udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
	240	info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
d46f37fd KS	241	}
	242	}
	243	goto exit;
	244	}
	245
	246	/* remove device node */
aa8734ff KS	247	if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
	248	/* import database entry and delete it */
	249	udev_device_read_db(dev);
	250	if (!event->test)
	251	udev_device_delete_db(dev);
	252
	253	if (udev_device_get_devnode(dev) == NULL) {
	254	char devnode[UTIL_PATH_SIZE];
	255
	256	info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
	257	udev_device_get_syspath(dev), udev_device_get_sysname(dev));
	258	util_strlcpy(devnode, udev_get_dev_path(event->udev), sizeof(devnode));
	259	util_strlcat(devnode, "/", sizeof(devnode));
	260	util_strlcat(devnode, udev_device_get_sysname(dev), sizeof(devnode));
	261	udev_device_set_devnode(dev, devnode);
d46f37fd KS	262	}
d46f37fd KS	263
aa8734ff KS	264	udev_rules_get_run(rules, event);
	265	if (event->ignore_device) {
	266	info(event->udev, "device event will be ignored\n");
d46f37fd KS	267	goto exit;
	268	}
	269
aa8734ff KS	270	if (udev_device_get_ignore_remove(dev)) {
aa8734ff KS	271	info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
d46f37fd KS	272	goto exit;
d46f37fd KS	273	}
d46f37fd	274
aa8734ff	275	err = udev_node_remove(dev, event->test);
d46f37fd KS	276	goto exit;
	277	}
	278
	279	/* default devices */
aa8734ff KS	280	udev_rules_get_run(rules, event);
	281	if (event->ignore_device)
	282	info(event->udev, "device event will be ignored\n");
d46f37fd	283	exit:
aa8734ff	284	return err;
d46f37fd	285	}