[thirdparty/systemd.git] / udev_start.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, "%s%s", sysfs_path, devpath);
	path[SYSFS_PATH_MAX-1] = '\0';
	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 dev.d/ scripts if we created a node or changed a netif name */
	if (udev.devname[0] != '\0') {
		setenv("DEVNAME", udev.devname, 1);
		dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
	}

	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
	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>
	26	#include <stddef.h>
	27	#include <string.h>
	28	#include <stdio.h>
	29	#include <errno.h>
	30	#include <ctype.h>
	31	#include <dirent.h>
	32	#include <sys/wait.h>
	33	#include <sys/types.h>
	34	#include <unistd.h>
	35
	36	#include "libsysfs/sysfs/libsysfs.h"
	37	#include "logging.h"
	38	#include "udev_lib.h"
	39	#include "list.h"
	40	#include "udev.h"
	41
	42
	43	#define MAX_PATHLEN 1024
	44	#define SYSBLOCK "/sys/block"
	45	#define SYSCLASS "/sys/class"
	46
	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);
	74	dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
	75	return 0;
	76	}
	77
	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
	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
	90	static int add_device(char devpath, char subsystem)
	91	{
	92	struct udevice udev;
	93	char path[SYSFS_PATH_MAX];
	94	struct sysfs_class_device *class_dev;
	95
	96	/* set environment for callouts and dev.d/ */
	97	setenv("DEVPATH", devpath, 1);
	98	setenv("SUBSYSTEM", subsystem, 1);
	99
	100	snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath);
	101	path[SYSFS_PATH_MAX-1] = '\0';
	102	class_dev = sysfs_open_class_device_path(path);
	103	if (class_dev == NULL) {
	104	dbg ("sysfs_open_class_device_path failed");
	105	return -ENODEV;
	106	}
	107
	108	udev_set_values(&udev, devpath, subsystem, "add");
	109	udev_add_device(&udev, class_dev);
	110
	111	/* run dev.d/ scripts if we created a node or changed a netif name */
	112	if (udev.devname[0] != '\0') {
	113	setenv("DEVNAME", udev.devname, 1);
	114	dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
	115	}
	116
	117	sysfs_close_class_device(class_dev);
	118
	119	return 0;
	120	}
	121
	122	static void exec_list(struct list_head *device_list)
	123	{
	124	struct device *loop_device;
	125	struct device *tmp_device;
	126	int i;
	127
	128	/* handle the "first" type devices first */
	129	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	130	for (i=0; first_list[i] != NULL; i++) {
	131	if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
	132	add_device(loop_device->path, loop_device->subsys);
	133	list_del(&loop_device->list);
	134	free(loop_device);
	135	break;
	136	}
	137	}
	138	}
	139
	140	/* handle the devices we are allowed to, excluding the "last" type devices */
	141	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	142	int found = 0;
	143	for (i=0; last_list[i] != NULL; i++) {
	144	if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
	145	found = 1;
	146	break;
	147	}
	148	}
	149	if (found)
	150	continue;
	151
	152	add_device(loop_device->path, loop_device->subsys);
	153	list_del(&loop_device->list);
	154	free(loop_device);
	155	}
	156
	157	/* handle the rest of the devices left over, if any */
	158	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	159	add_device(loop_device->path, loop_device->subsys);
	160	list_del(&loop_device->list);
	161	free(loop_device);
	162	}
	163	}
	164
	165	static void udev_scan_block(void)
	166	{
	167	DIR *dir;
	168	struct dirent *dent;
	169	LIST_HEAD(device_list);
	170
	171	dir = opendir(SYSBLOCK);
	172	if (dir != NULL) {
	173	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	174	char dirname[MAX_PATHLEN];
	175	DIR *dir2;
	176	struct dirent *dent2;
	177
	178	if ((strcmp(dent->d_name, ".") == 0) \|\|
	179	(strcmp(dent->d_name, "..") == 0))
	180	continue;
	181
	182	snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
	183	dirname[MAX_PATHLEN-1] = '\0';
	184	device_list_insert(dirname, "block", &device_list);
	185
	186	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
	187	dir2 = opendir(dirname);
	188	if (dir2 != NULL) {
	189	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
	190	char dirname2[MAX_PATHLEN];
	191	DIR *dir3;
	192	struct dirent *dent3;
	193
	194	if ((strcmp(dent2->d_name, ".") == 0) \|\|
	195	(strcmp(dent2->d_name, "..") == 0))
	196	continue;
	197
	198	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
	199	dirname2[MAX_PATHLEN-1] = '\0';
	200
	201	dir3 = opendir(dirname2);
	202	if (dir3 != NULL) {
	203	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
	204	char filename[MAX_PATHLEN];
	205
	206	if (strcmp(dent3->d_name, "dev") == 0) {
	207	snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
	208	dent->d_name, dent2->d_name);
	209	filename[MAX_PATHLEN-1] = '\0';
	210	device_list_insert(filename, "block", &device_list);
	211	}
	212	}
	213	closedir(dir3);
	214	}
	215	}
	216	closedir(dir2);
	217	}
	218	}
	219	closedir(dir);
	220	}
	221
	222	exec_list(&device_list);
	223	}
	224
	225	static void udev_scan_class(void)
	226	{
	227	DIR *dir;
	228	struct dirent *dent;
	229	LIST_HEAD(device_list);
	230
	231	dir = opendir(SYSCLASS);
	232	if (dir != NULL) {
	233	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	234	char dirname[MAX_PATHLEN];
	235	DIR *dir2;
	236	struct dirent *dent2;
	237
	238	if ((strcmp(dent->d_name, ".") == 0) \|\|
	239	(strcmp(dent->d_name, "..") == 0))
	240	continue;
	241
	242	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
	243	dirname[MAX_PATHLEN-1] = '\0';
	244	dir2 = opendir(dirname);
	245	if (dir2 != NULL) {
	246	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
	247	char dirname2[MAX_PATHLEN];
	248	DIR *dir3;
	249	struct dirent *dent3;
	250
	251	if ((strcmp(dent2->d_name, ".") == 0) \|\|
	252	(strcmp(dent2->d_name, "..") == 0))
	253	continue;
	254
	255	/* pass the net class as it is */
	256	if (strcmp(dent->d_name, "net") == 0) {
	257	snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
	258	device_list_insert(dirname2, "net", &device_list);
	259	continue;
	260	}
	261
	262	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
	263	dirname2[MAX_PATHLEN-1] = '\0';
	264	dir3 = opendir(dirname2);
	265	if (dir3 != NULL) {
	266	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
	267	char filename[MAX_PATHLEN];
	268
	269	/* pass devices with a "dev" file */
	270	if (strcmp(dent3->d_name, "dev") == 0) {
	271	snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
	272	dent->d_name, dent2->d_name);
	273	filename[MAX_PATHLEN-1] = '\0';
	274	device_list_insert(filename, dent->d_name, &device_list);
	275	break;
	276	}
	277	}
	278	closedir(dir3);
	279	}
	280	}
	281	closedir(dir2);
	282	}
	283	}
	284	closedir(dir);
	285	}
	286
	287	exec_list(&device_list);
	288	}
	289
	290	int udev_start(void)
	291	{
	292	/* set environment for callouts and dev.d/ */
	293	setenv("ACTION", "add", 1);
	294	setenv("UDEVSTART", "1", 1);
	295
	296	udev_scan_class();
	297	udev_scan_block();
	298
	299	return 0;
	300	}