[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;
	char *argv[3];

	/* fake argument vector and environment for callouts and dev.d/ */
	argv[0] = "udev";
	argv[1] = subsystem;
	argv[2] = NULL;

	main_argv = argv;
	setenv("DEVPATH", devpath, 1);
	setenv("ACTION", "add", 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);
	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)
{
	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 KS	95	char *argv[3];
	96
	97	/* fake argument vector and environment for callouts and dev.d/ */
	98	argv[0] = "udev";
7a947ce5	99	argv[1] = subsystem;
f608f8ac KS	100	argv[2] = NULL;
	101
	102	main_argv = argv;
7a947ce5	103	setenv("DEVPATH", devpath, 1);
f608f8ac	104	setenv("ACTION", "add", 1);
7a947ce5	105
5d24c6ca	106	snprintf(path, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
7a947ce5 KS	107	class_dev = sysfs_open_class_device_path(path);
	108	if (class_dev == NULL) {
	109	dbg ("sysfs_open_class_device_path failed");
	110	return -ENODEV;
	111	}
	112
	113	udev_set_values(&udev, devpath, subsystem);
5d24c6ca	114	udev_add_device(&udev, class_dev);
7a947ce5	115
5d24c6ca KS	116	/* run scripts */
	117	dev_d_execute(&udev);
	118
	119	sysfs_close_class_device(class_dev);
	120
	121	return 0;
f608f8ac KS	122	}
f608f8ac KS	123
0e306d08 GKH	124	static void exec_list(struct list_head *device_list)
	125	{
	126	struct device *loop_device;
	127	struct device *tmp_device;
70f630f6 GKH	128	int i;
	129
	130	/* handle the "first" type devices first */
	131	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	132	for (i=0; first_list[i] != NULL; i++) {
	133	if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
7a947ce5	134	add_device(loop_device->path, loop_device->subsys);
70f630f6 GKH	135	list_del(&loop_device->list);
	136	free(loop_device);
	137	break;
	138	}
	139	}
	140	}
0e306d08 GKH	141
	142	/* handle the devices we are allowed to, excluding the "last" type devices */
	143	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	144	int found = 0;
0e306d08 GKH	145	for (i=0; last_list[i] != NULL; i++) {
	146	if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
	147	found = 1;
	148	break;
	149	}
	150	}
	151	if (found)
	152	continue;
	153
7a947ce5	154	add_device(loop_device->path, loop_device->subsys);
0e306d08 GKH	155	list_del(&loop_device->list);
	156	free(loop_device);
	157	}
	158
	159	/* handle the rest of the devices left over, if any */
	160	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
7a947ce5	161	add_device(loop_device->path, loop_device->subsys);
0e306d08 GKH	162	list_del(&loop_device->list);
	163	free(loop_device);
	164	}
	165	}
	166
	167	static void udev_scan_block(void)
82b9a637	168	{
e4dc0e11 KS	169	DIR *dir;
e4dc0e11 KS	170	struct dirent *dent;
0e306d08	171	LIST_HEAD(device_list);
82b9a637	172
0e306d08	173	dir = opendir(SYSBLOCK);
e4dc0e11 KS	174	if (dir != NULL) {
	175	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	176	char dirname[MAX_PATHLEN];
	177	DIR *dir2;
	178	struct dirent *dent2;
	179
	180	if ((strcmp(dent->d_name, ".") == 0) \|\|
	181	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	182	continue;
82b9a637 GKH	183
0e306d08 GKH	184	snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
	185	dirname[MAX_PATHLEN-1] = '\0';
	186	device_list_insert(dirname, "block", &device_list);
	187
	188	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
82b9a637	189	dir2 = opendir(dirname);
e4dc0e11 KS	190	if (dir2 != NULL) {
e4dc0e11 KS	191	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
0e306d08	192	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	193	DIR *dir3;
e4dc0e11 KS	194	struct dirent *dent3;
82b9a637 GKH	195
	196	if ((strcmp(dent2->d_name, ".") == 0) \|\|
	197	(strcmp(dent2->d_name, "..") == 0))
	198	continue;
	199
	200	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	201	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637 GKH	202
82b9a637 GKH	203	dir3 = opendir(dirname2);
e4dc0e11 KS	204	if (dir3 != NULL) {
e4dc0e11 KS	205	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
82b9a637 GKH	206	char filename[MAX_PATHLEN];
	207
	208	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	209	snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
e4dc0e11 KS	210	dent->d_name, dent2->d_name);
e4dc0e11 KS	211	filename[MAX_PATHLEN-1] = '\0';
0e306d08	212	device_list_insert(filename, "block", &device_list);
82b9a637 GKH	213	}
82b9a637 GKH	214	}
e13fa599	215	closedir(dir3);
82b9a637 GKH	216	}
82b9a637 GKH	217	}
e13fa599	218	closedir(dir2);
82b9a637 GKH	219	}
82b9a637 GKH	220	}
e13fa599	221	closedir(dir);
82b9a637 GKH	222	}
82b9a637 GKH	223
0e306d08 GKH	224	exec_list(&device_list);
	225	}
	226
	227	static void udev_scan_class(void)
	228	{
	229	DIR *dir;
	230	struct dirent *dent;
	231	LIST_HEAD(device_list);
	232
	233	dir = opendir(SYSCLASS);
e4dc0e11 KS	234	if (dir != NULL) {
	235	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	236	char dirname[MAX_PATHLEN];
	237	DIR *dir2;
	238	struct dirent *dent2;
	239
	240	if ((strcmp(dent->d_name, ".") == 0) \|\|
	241	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	242	continue;
82b9a637 GKH	243
0e306d08	244	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
462be028	245	dirname[MAX_PATHLEN-1] = '\0';
82b9a637	246	dir2 = opendir(dirname);
e4dc0e11 KS	247	if (dir2 != NULL) {
e4dc0e11 KS	248	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
a551c7b0	249	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	250	DIR *dir3;
e4dc0e11 KS	251	struct dirent *dent3;
82b9a637	252
e4dc0e11 KS	253	if ((strcmp(dent2->d_name, ".") == 0) \|\|
e4dc0e11 KS	254	(strcmp(dent2->d_name, "..") == 0))
82b9a637 GKH	255	continue;
82b9a637 GKH	256
aee380b6 KS	257	/* pass the net class as it is */
	258	if (strcmp(dent->d_name, "net") == 0) {
	259	snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
	260	device_list_insert(dirname2, "net", &device_list);
	261	continue;
	262	}
	263
82b9a637	264	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	265	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637	266	dir3 = opendir(dirname2);
e4dc0e11 KS	267	if (dir3 != NULL) {
	268	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
	269	char filename[MAX_PATHLEN];
82b9a637	270
aee380b6	271	/* pass devices with a "dev" file */
82b9a637	272	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	273	snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
e4dc0e11 KS	274	dent->d_name, dent2->d_name);
e4dc0e11 KS	275	filename[MAX_PATHLEN-1] = '\0';
0e306d08	276	device_list_insert(filename, dent->d_name, &device_list);
aee380b6	277	break;
82b9a637 GKH	278	}
82b9a637 GKH	279	}
e13fa599	280	closedir(dir3);
82b9a637 GKH	281	}
82b9a637 GKH	282	}
e13fa599	283	closedir(dir2);
82b9a637 GKH	284	}
82b9a637 GKH	285	}
e13fa599	286	closedir(dir);
82b9a637	287	}
0e306d08 GKH	288
0e306d08 GKH	289	exec_list(&device_list);
82b9a637 GKH	290	}
82b9a637 GKH	291
eb6c7cd0	292	int udev_start(void)
82b9a637	293	{
0e306d08 GKH	294	udev_scan_class();
0e306d08 GKH	295	udev_scan_block();
3f20eac0	296	return 0;
82b9a637	297	}