[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 "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 void add_device(char *path, char *subsys, int fake)
{
	char *argv[3];

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

	main_argv = argv;
	setenv("DEVPATH", path, 1);
	setenv("ACTION", "add", 1);
	udev_add_device(path, subsys, fake);
}

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, NOFAKE);
				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, NOFAKE);
		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, NOFAKE);
		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 GKH	35
82b9a637 GKH	36	#include "logging.h"
9b28a52a	37	#include "udev_lib.h"
0e306d08	38	#include "list.h"
eb6c7cd0	39	#include "udev.h"
82b9a637 GKH	40
82b9a637 GKH	41
e4dc0e11 KS	42	#define MAX_PATHLEN 1024
	43	#define SYSBLOCK "/sys/block"
	44	#define SYSCLASS "/sys/class"
82b9a637	45
0e306d08 GKH	46	struct device {
	47	struct list_head list;
	48	char path[MAX_PATHLEN];
	49	char subsys[MAX_PATHLEN];
	50	};
	51
	52	/* sort files in lexical order */
	53	static int device_list_insert(char path, char subsystem, struct list_head *device_list)
	54	{
	55	struct device *loop_device;
	56	struct device *new_device;
	57
	58	list_for_each_entry(loop_device, device_list, list) {
	59	if (strcmp(loop_device->path, path) > 0) {
	60	break;
	61	}
	62	}
	63
	64	new_device = malloc(sizeof(struct device));
	65	if (new_device == NULL) {
	66	dbg("error malloc");
	67	return -ENOMEM;
	68	}
	69
	70	strfieldcpy(new_device->path, path);
	71	strfieldcpy(new_device->subsys, subsystem);
	72	list_add_tail(&new_device->list, &loop_device->list);
aee380b6	73	dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
0e306d08 GKH	74	return 0;
	75	}
	76
0e306d08 GKH	77	/* list of devices that we should run last due to any one of a number of reasons */
	78	static char *last_list[] = {
	79	"/block/dm", /* on here because dm wants to have the block devices around before it */
	80	NULL,
	81	};
	82
70f630f6 GKH	83	/* list of devices that we should run first due to any one of a number of reasons */
	84	static char *first_list[] = {
	85	"/class/mem", /* people tend to like their memory devices around first... */
	86	NULL,
	87	};
	88
f608f8ac KS	89	static void add_device(char path, char subsys, int fake)
	90	{
	91	char *argv[3];
	92
	93	/* fake argument vector and environment for callouts and dev.d/ */
	94	argv[0] = "udev";
	95	argv[1] = subsys;
	96	argv[2] = NULL;
	97
	98	main_argv = argv;
	99	setenv("DEVPATH", path, 1);
	100	setenv("ACTION", "add", 1);
	101	udev_add_device(path, subsys, fake);
	102	}
	103
0e306d08 GKH	104	static void exec_list(struct list_head *device_list)
	105	{
	106	struct device *loop_device;
	107	struct device *tmp_device;
70f630f6 GKH	108	int i;
	109
	110	/* handle the "first" type devices first */
	111	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	112	for (i=0; first_list[i] != NULL; i++) {
	113	if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
f608f8ac	114	add_device(loop_device->path, loop_device->subsys, NOFAKE);
70f630f6 GKH	115	list_del(&loop_device->list);
	116	free(loop_device);
	117	break;
	118	}
	119	}
	120	}
0e306d08 GKH	121
	122	/* handle the devices we are allowed to, excluding the "last" type devices */
	123	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
	124	int found = 0;
0e306d08 GKH	125	for (i=0; last_list[i] != NULL; i++) {
	126	if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
	127	found = 1;
	128	break;
	129	}
	130	}
	131	if (found)
	132	continue;
	133
f608f8ac	134	add_device(loop_device->path, loop_device->subsys, NOFAKE);
0e306d08 GKH	135	list_del(&loop_device->list);
	136	free(loop_device);
	137	}
	138
	139	/* handle the rest of the devices left over, if any */
	140	list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
f608f8ac	141	add_device(loop_device->path, loop_device->subsys, NOFAKE);
0e306d08 GKH	142	list_del(&loop_device->list);
	143	free(loop_device);
	144	}
	145	}
	146
	147	static void udev_scan_block(void)
82b9a637	148	{
e4dc0e11 KS	149	DIR *dir;
e4dc0e11 KS	150	struct dirent *dent;
0e306d08	151	LIST_HEAD(device_list);
82b9a637	152
0e306d08	153	dir = opendir(SYSBLOCK);
e4dc0e11 KS	154	if (dir != NULL) {
	155	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	156	char dirname[MAX_PATHLEN];
	157	DIR *dir2;
	158	struct dirent *dent2;
	159
	160	if ((strcmp(dent->d_name, ".") == 0) \|\|
	161	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	162	continue;
82b9a637 GKH	163
0e306d08 GKH	164	snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
	165	dirname[MAX_PATHLEN-1] = '\0';
	166	device_list_insert(dirname, "block", &device_list);
	167
	168	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
82b9a637	169	dir2 = opendir(dirname);
e4dc0e11 KS	170	if (dir2 != NULL) {
e4dc0e11 KS	171	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
0e306d08	172	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	173	DIR *dir3;
e4dc0e11 KS	174	struct dirent *dent3;
82b9a637 GKH	175
	176	if ((strcmp(dent2->d_name, ".") == 0) \|\|
	177	(strcmp(dent2->d_name, "..") == 0))
	178	continue;
	179
	180	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	181	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637 GKH	182
82b9a637 GKH	183	dir3 = opendir(dirname2);
e4dc0e11 KS	184	if (dir3 != NULL) {
e4dc0e11 KS	185	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
82b9a637 GKH	186	char filename[MAX_PATHLEN];
	187
	188	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	189	snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
e4dc0e11 KS	190	dent->d_name, dent2->d_name);
e4dc0e11 KS	191	filename[MAX_PATHLEN-1] = '\0';
0e306d08	192	device_list_insert(filename, "block", &device_list);
82b9a637 GKH	193	}
82b9a637 GKH	194	}
e13fa599	195	closedir(dir3);
82b9a637 GKH	196	}
82b9a637 GKH	197	}
e13fa599	198	closedir(dir2);
82b9a637 GKH	199	}
82b9a637 GKH	200	}
e13fa599	201	closedir(dir);
82b9a637 GKH	202	}
82b9a637 GKH	203
0e306d08 GKH	204	exec_list(&device_list);
	205	}
	206
	207	static void udev_scan_class(void)
	208	{
	209	DIR *dir;
	210	struct dirent *dent;
	211	LIST_HEAD(device_list);
	212
	213	dir = opendir(SYSCLASS);
e4dc0e11 KS	214	if (dir != NULL) {
	215	for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
	216	char dirname[MAX_PATHLEN];
	217	DIR *dir2;
	218	struct dirent *dent2;
	219
	220	if ((strcmp(dent->d_name, ".") == 0) \|\|
	221	(strcmp(dent->d_name, "..") == 0))
82b9a637 GKH	222	continue;
82b9a637 GKH	223
0e306d08	224	snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
462be028	225	dirname[MAX_PATHLEN-1] = '\0';
82b9a637	226	dir2 = opendir(dirname);
e4dc0e11 KS	227	if (dir2 != NULL) {
e4dc0e11 KS	228	for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
a551c7b0	229	char dirname2[MAX_PATHLEN];
e4dc0e11 KS	230	DIR *dir3;
e4dc0e11 KS	231	struct dirent *dent3;
82b9a637	232
e4dc0e11 KS	233	if ((strcmp(dent2->d_name, ".") == 0) \|\|
e4dc0e11 KS	234	(strcmp(dent2->d_name, "..") == 0))
82b9a637 GKH	235	continue;
82b9a637 GKH	236
aee380b6 KS	237	/* pass the net class as it is */
	238	if (strcmp(dent->d_name, "net") == 0) {
	239	snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
	240	device_list_insert(dirname2, "net", &device_list);
	241	continue;
	242	}
	243
82b9a637	244	snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
e4dc0e11	245	dirname2[MAX_PATHLEN-1] = '\0';
82b9a637	246	dir3 = opendir(dirname2);
e4dc0e11 KS	247	if (dir3 != NULL) {
	248	for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
	249	char filename[MAX_PATHLEN];
82b9a637	250
aee380b6	251	/* pass devices with a "dev" file */
82b9a637	252	if (strcmp(dent3->d_name, "dev") == 0) {
0e306d08	253	snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
e4dc0e11 KS	254	dent->d_name, dent2->d_name);
e4dc0e11 KS	255	filename[MAX_PATHLEN-1] = '\0';
0e306d08	256	device_list_insert(filename, dent->d_name, &device_list);
aee380b6	257	break;
82b9a637 GKH	258	}
82b9a637 GKH	259	}
e13fa599	260	closedir(dir3);
82b9a637 GKH	261	}
82b9a637 GKH	262	}
e13fa599	263	closedir(dir2);
82b9a637 GKH	264	}
82b9a637 GKH	265	}
e13fa599	266	closedir(dir);
82b9a637	267	}
0e306d08 GKH	268
0e306d08 GKH	269	exec_list(&device_list);
82b9a637 GKH	270	}
82b9a637 GKH	271
eb6c7cd0	272	int udev_start(void)
82b9a637	273	{
0e306d08 GKH	274	udev_scan_class();
0e306d08 GKH	275	udev_scan_block();
3f20eac0	276	return 0;
82b9a637	277	}