[thirdparty/systemd.git] / udevstart.c

/*
 * udevstart.c
 *
 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
 * 
 * Quick and dirty way to populate a /dev with udev if your system
 * does not have access to a shell.  Based originally on a patch to udev 
 * from Harald Hoyer <harald@redhat.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 <stddef.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <unistd.h>

#include "libsysfs/sysfs/libsysfs.h"
#include "logging.h"
#include "udev_lib.h"
#include "list.h"
#include "udev.h"


#define MAX_PATHLEN		1024
#define SYSBLOCK		"/sys/block"
#define SYSCLASS		"/sys/class"

struct device {
	struct list_head list;
	char path[MAX_PATHLEN];
	char subsys[MAX_PATHLEN];
};

/* sort files in lexical order */
static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
{
	struct device *loop_device;
	struct device *new_device;

	list_for_each_entry(loop_device, device_list, list) {
		if (strcmp(loop_device->path, path) > 0) {
			break;
		}
	}

	new_device = malloc(sizeof(struct device));
	if (new_device == NULL) {
		dbg("error malloc");
		return -ENOMEM;
	}

	strfieldcpy(new_device->path, path);
	strfieldcpy(new_device->subsys, subsystem);
	list_add_tail(&new_device->list, &loop_device->list);
	dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
	return 0;
}

/* list of devices that we should run last due to any one of a number of reasons */
static char *last_list[] = {
	"/block/dm",	/* on here because dm wants to have the block devices around before it */
	NULL,
};

/* list of devices that we should run first due to any one of a number of reasons */
static char *first_list[] = {
	"/class/mem",	/* people tend to like their memory devices around first... */
	NULL,
};

static int add_device(char *devpath, char *subsystem)
{
	struct udevice udev;
	char path[SYSFS_PATH_MAX];
	struct sysfs_class_device *class_dev;

	/* set environment for callouts and dev.d/ */
	setenv("DEVPATH", devpath, 1);
	setenv("SUBSYSTEM", subsystem, 1);

	snprintf(path, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
	class_dev = sysfs_open_class_device_path(path);
	if (class_dev == NULL) {
		dbg ("sysfs_open_class_device_path failed");
		return -ENODEV;
	}

	udev_set_values(&udev, devpath, subsystem, "add");
	udev_add_device(&udev, class_dev);

	/* run scripts */
	dev_d_execute(&udev);

	sysfs_close_class_device(class_dev);

	return 0;
}

static void exec_list(struct list_head *device_list)
{
	struct device *loop_device;
	struct device *tmp_device;
	int i;

	/* handle the "first" type devices first */
	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
		for (i=0; first_list[i] != NULL; i++) {
			if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
				add_device(loop_device->path, loop_device->subsys);
				list_del(&loop_device->list);
				free(loop_device);
				break;
			}
		}
	}

	/* handle the devices we are allowed to, excluding the "last" type devices */
	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
		int found = 0;
		for (i=0; last_list[i] != NULL; i++) {
			if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
				found = 1;
				break;
			}
		}
		if (found)
			continue;

		add_device(loop_device->path, loop_device->subsys);
		list_del(&loop_device->list);
		free(loop_device);
	}

	/* handle the rest of the devices left over, if any */
	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
		add_device(loop_device->path, loop_device->subsys);
		list_del(&loop_device->list);
		free(loop_device);
	}
}

static void udev_scan_block(void)
{
	DIR *dir;
	struct dirent *dent;
	LIST_HEAD(device_list);

	dir = opendir(SYSBLOCK);
	if (dir != NULL) {
		for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
			char dirname[MAX_PATHLEN];
			DIR *dir2;
			struct dirent *dent2;

			if ((strcmp(dent->d_name, ".") == 0) ||
			    (strcmp(dent->d_name, "..") == 0))
				continue;

			snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
			dirname[MAX_PATHLEN-1] = '\0';
			device_list_insert(dirname, "block", &device_list);

			snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
			dir2 = opendir(dirname);
			if (dir2 != NULL) {
				for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
					char dirname2[MAX_PATHLEN];
					DIR *dir3;
					struct dirent *dent3;

					if ((strcmp(dent2->d_name, ".") == 0) ||
					    (strcmp(dent2->d_name, "..") == 0))
						continue;

					snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
					dirname2[MAX_PATHLEN-1] = '\0';

					dir3 = opendir(dirname2);
					if (dir3 != NULL) {
						for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
							char filename[MAX_PATHLEN];

							if (strcmp(dent3->d_name, "dev") == 0) {
								snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
									 dent->d_name, dent2->d_name);
								filename[MAX_PATHLEN-1] = '\0';
								device_list_insert(filename, "block", &device_list);
							}
						}
						closedir(dir3);
					}
				}
				closedir(dir2);
			}
		}
		closedir(dir);
	}

	exec_list(&device_list);
}

static void udev_scan_class(void)
{
	DIR *dir;
	struct dirent *dent;
	LIST_HEAD(device_list);

	dir = opendir(SYSCLASS);
	if (dir != NULL) {
		for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
			char dirname[MAX_PATHLEN];
			DIR *dir2;
			struct dirent *dent2;

			if ((strcmp(dent->d_name, ".") == 0) ||
			    (strcmp(dent->d_name, "..") == 0))
				continue;

			snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
			dirname[MAX_PATHLEN-1] = '\0';
			dir2 = opendir(dirname);
			if (dir2 != NULL) {
				for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
					char dirname2[MAX_PATHLEN];
					DIR *dir3;
					struct dirent *dent3;

					if ((strcmp(dent2->d_name, ".") == 0) ||
					    (strcmp(dent2->d_name, "..") == 0))
						continue;

					/* pass the net class as it is */
					if (strcmp(dent->d_name, "net") == 0) {
						snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
						device_list_insert(dirname2, "net", &device_list);
						continue;
					}

					snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
					dirname2[MAX_PATHLEN-1] = '\0';
					dir3 = opendir(dirname2);
					if (dir3 != NULL) {
						for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
							char filename[MAX_PATHLEN];

							/* pass devices with a "dev" file */
							if (strcmp(dent3->d_name, "dev") == 0) {
								snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
									 dent->d_name, dent2->d_name);
								filename[MAX_PATHLEN-1] = '\0';
								device_list_insert(filename, dent->d_name, &device_list);
								break;
							}
						}
						closedir(dir3);
					}
				}
				closedir(dir2);
			}
		}
		closedir(dir);
	}

	exec_list(&device_list);
}

int udev_start(void)
{
	/* set environment for callouts and dev.d/ */
	setenv("ACTION", "add", 1);
	setenv("UDEVSTART", "1", 1);

	udev_scan_class();
	udev_scan_block();

	return 0;
}
Commit	Line	Data
82b9a637 GKH	1	/*
	2	* udevstart.c
	3	*
	4	* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
	5	*
	6	* Quick and dirty way to populate a /dev with udev if your system
	7	* does not have access to a shell. Based originally on a patch to udev
	8	* from Harald Hoyer <harald@redhat.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by the
	12	* Free Software Foundation version 2 of the License.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
	23	*/
	24
	25	#include <stdlib.h>
0e306d08	26	#include <stddef.h>
82b9a637 GKH	27	#include <string.h>
	28	#include <stdio.h>
	29	#include <errno.h>
	30	#include <ctype.h>
82b9a637 GKH	31	#include <dirent.h>
82b9a637 GKH	32	#include <sys/wait.h>
f27125f9	33	#include <sys/types.h>
f27125f9	34	#include <unistd.h>
82b9a637	35
7a947ce5	36	#include "libsysfs/sysfs/libsysfs.h"
82b9a637	37	#include "logging.h"
9b28a52a	38	#include "udev_lib.h"
0e306d08	39	#include "list.h"
eb6c7cd0	40	#include "udev.h"
82b9a637 GKH	41
82b9a637 GKH	42
e4dc0e11 KS	43	#define MAX_PATHLEN 1024
	44	#define SYSBLOCK "/sys/block"
	45	#define SYSCLASS "/sys/class"
82b9a637	46
0e306d08 GKH	47	struct device {
	48	struct list_head list;
	49	char path[MAX_PATHLEN];
	50	char subsys[MAX_PATHLEN];
	51	};
	52
	53	/* sort files in lexical order */
	54	static int device_list_insert(char path, char subsystem, struct list_head *device_list)
	55	{
	56	struct device *loop_device;
	57	struct device *new_device;
	58
	59	list_for_each_entry(loop_device, device_list, list) {
	60	if (strcmp(loop_device->path, path) > 0) {
	61	break;
	62	}
	63	}
	64
	65	new_device = malloc(sizeof(struct device));
	66	if (new_device == NULL) {
	67	dbg("error malloc");
	68	return -ENOMEM;
	69	}
	70
	71	strfieldcpy(new_device->path, path);
	72	strfieldcpy(new_device->subsys, subsystem);
	73	list_add_tail(&new_device->list, &loop_device->list);
aee380b6	74	dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
0e306d08 GKH	75	return 0;
	76	}
	77
0e306d08 GKH	78	/* list of devices that we should run last due to any one of a number of reasons */
	79	static char *last_list[] = {
	80	"/block/dm", /* on here because dm wants to have the block devices around before it */
	81	NULL,
	82	};
	83
70f630f6 GKH	84	/* list of devices that we should run first due to any one of a number of reasons */
	85	static char *first_list[] = {
	86	"/class/mem", /* people tend to like their memory devices around first... */
	87	NULL,
	88	};
	89
7a947ce5	90	static int add_device(char devpath, char subsystem)
f608f8ac	91	{
7a947ce5 KS	92	struct udevice udev;
	93	char path[SYSFS_PATH_MAX];
	94	struct sysfs_class_device *class_dev;
f608f8ac	95
af4b05d4	96	/* set environment for callouts and dev.d/ */
7a947ce5	97	setenv("DEVPATH", devpath, 1);
af4b05d4	98	setenv("SUBSYSTEM", subsystem, 1);
7a947ce5	99
5d24c6ca	100	snprintf(path, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
7a947ce5 KS	101	class_dev = sysfs_open_class_device_path(path);
	102	if (class_dev == NULL) {
	103	dbg ("sysfs_open_class_device_path failed");
	104	return -ENODEV;
	105	}
	106
c6478ec1	107	udev_set_values(&udev, devpath, subsystem, "add");
5d24c6ca	108	udev_add_device(&udev, class_dev);
7a947ce5	109
5d24c6ca KS	110	/* run scripts */
	111	dev_d_execute(&udev);
	112
	113	sysfs_close_class_device(class_dev);
	114
	115	return 0;
f608f8ac KS	116	}
f608f8ac KS	117
0e306d08 GKH	118	static void exec_list(struct list_head *device_list)
	119	{
	120	struct device *loop_device;
	121	struct device *tmp_device;
70f630f6 GKH	122	int i;
	123
	124	/* handle the "first" type devices first */
	125	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	126	for (i=0; first_list[i] != NULL; i++) {
	127	if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
7a947ce5	128	add_device(loop_device->path, loop_device->subsys);
70f630f6 GKH	129	list_del(&loop_device->list);
	130	free(loop_device);
	131	break;
	132	}
	133	}
	134	}
0e306d08 GKH	135
	136	/* handle the devices we are allowed to, excluding the "last" type devices */
	137	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	138	int found = 0;
0e306d08 GKH	139	for (i=0; last_list[i] != NULL; i++) {
	140	if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
	141	found = 1;
	142	break;
	143	}
	144	}
	145	if (found)
	146	continue;
	147
7a947ce5	148	add_device(loop_device->path, loop_device->subsys);
0e306d08 GKH	149	list_del(&loop_device->list);
	150	free(loop_device);
	151	}
	152
	153	/* handle the rest of the devices left over, if any */
	154	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
7a947ce5	155	add_device(loop_device->path, loop_device->subsys);
0e306d08 GKH	156	list_del(&loop_device->list);
	157	free(loop_device);
	158	}
	159	}
	160
	161	static void udev_scan_block(void)
82b9a637	162	{
e4dc0e11 KS	163	DIR *dir;
e4dc0e11 KS	164	struct dirent *dent;
0e306d08	165	LIST_HEAD(device_list);
82b9a637	166
0e306d08	167	dir = opendir(SYSBLOCK);
e4dc0e11 KS	168	if (dir != NULL) {
	169	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	170	char dirname[MAX_PATHLEN];
	171	DIR *dir2;
	172	struct dirent *dent2;
	173
	174	if ((strcmp(dent->d_name, ".") == 0) \|\|
	175	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	176	continue;
82b9a637 GKH	177
0e306d08 GKH	178	snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
	179	dirname[MAX_PATHLEN-1] = '\0';
	180	device_list_insert(dirname, "block", &device_list);
	181
	182	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
82b9a637	183	dir2 = opendir(dirname);
e4dc0e11 KS	184	if (dir2 != NULL) {
e4dc0e11 KS	185	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
0e306d08	186	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	187	DIR *dir3;
e4dc0e11 KS	188	struct dirent *dent3;
82b9a637 GKH	189
	190	if ((strcmp(dent2->d_name, ".") == 0) \|\|
	191	(strcmp(dent2->d_name, "..") == 0))
	192	continue;
	193
	194	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	195	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637 GKH	196
82b9a637 GKH	197	dir3 = opendir(dirname2);
e4dc0e11 KS	198	if (dir3 != NULL) {
e4dc0e11 KS	199	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
82b9a637 GKH	200	char filename[MAX_PATHLEN];
	201
	202	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	203	snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
e4dc0e11 KS	204	dent->d_name, dent2->d_name);
e4dc0e11 KS	205	filename[MAX_PATHLEN-1] = '\0';
0e306d08	206	device_list_insert(filename, "block", &device_list);
82b9a637 GKH	207	}
82b9a637 GKH	208	}
e13fa599	209	closedir(dir3);
82b9a637 GKH	210	}
82b9a637 GKH	211	}
e13fa599	212	closedir(dir2);
82b9a637 GKH	213	}
82b9a637 GKH	214	}
e13fa599	215	closedir(dir);
82b9a637 GKH	216	}
82b9a637 GKH	217
0e306d08 GKH	218	exec_list(&device_list);
	219	}
	220
	221	static void udev_scan_class(void)
	222	{
	223	DIR *dir;
	224	struct dirent *dent;
	225	LIST_HEAD(device_list);
	226
	227	dir = opendir(SYSCLASS);
e4dc0e11 KS	228	if (dir != NULL) {
	229	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	230	char dirname[MAX_PATHLEN];
	231	DIR *dir2;
	232	struct dirent *dent2;
	233
	234	if ((strcmp(dent->d_name, ".") == 0) \|\|
	235	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	236	continue;
82b9a637 GKH	237
0e306d08	238	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
462be028	239	dirname[MAX_PATHLEN-1] = '\0';
82b9a637	240	dir2 = opendir(dirname);
e4dc0e11 KS	241	if (dir2 != NULL) {
e4dc0e11 KS	242	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
a551c7b0	243	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	244	DIR *dir3;
e4dc0e11 KS	245	struct dirent *dent3;
82b9a637	246
e4dc0e11 KS	247	if ((strcmp(dent2->d_name, ".") == 0) \|\|
e4dc0e11 KS	248	(strcmp(dent2->d_name, "..") == 0))
82b9a637 GKH	249	continue;
82b9a637 GKH	250
aee380b6 KS	251	/* pass the net class as it is */
	252	if (strcmp(dent->d_name, "net") == 0) {
	253	snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
	254	device_list_insert(dirname2, "net", &device_list);
	255	continue;
	256	}
	257
82b9a637	258	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	259	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637	260	dir3 = opendir(dirname2);
e4dc0e11 KS	261	if (dir3 != NULL) {
	262	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
	263	char filename[MAX_PATHLEN];
82b9a637	264
aee380b6	265	/* pass devices with a "dev" file */
82b9a637	266	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	267	snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
e4dc0e11 KS	268	dent->d_name, dent2->d_name);
e4dc0e11 KS	269	filename[MAX_PATHLEN-1] = '\0';
0e306d08	270	device_list_insert(filename, dent->d_name, &device_list);
aee380b6	271	break;
82b9a637 GKH	272	}
82b9a637 GKH	273	}
e13fa599	274	closedir(dir3);
82b9a637 GKH	275	}
82b9a637 GKH	276	}
e13fa599	277	closedir(dir2);
82b9a637 GKH	278	}
82b9a637 GKH	279	}
e13fa599	280	closedir(dir);
82b9a637	281	}
0e306d08 GKH	282
0e306d08 GKH	283	exec_list(&device_list);
82b9a637 GKH	284	}
82b9a637 GKH	285
eb6c7cd0	286	int udev_start(void)
82b9a637	287	{
af4b05d4 KS	288	/* set environment for callouts and dev.d/ */
	289	setenv("ACTION", "add", 1);
	290	setenv("UDEVSTART", "1", 1);
	291
0e306d08 GKH	292	udev_scan_class();
0e306d08 GKH	293	udev_scan_block();
af4b05d4	294
3f20eac0	295	return 0;
82b9a637	296	}