summaryrefslogtreecommitdiff
path: root/udev.c
blob: 8746b9a8102820de64b0d72ec3bd882b8ed83ee0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
 * udev.c
 *
 * Userspace devfs
 *
 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.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 <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#include "udev.h"
#include "udev_version.h"
#include "namedev.h"
#include "udevdb.h"
#include "libsysfs/libsysfs.h"

/* global variables */
char **main_argv;
char **main_envp;

char sysfs_path[SYSFS_PATH_MAX];
char *udev_config_dir = UDEV_CONFIG_DIR;
char *udev_root = UDEV_ROOT;
char udev_db_filename[PATH_MAX+NAME_MAX];
char udev_config_permission_filename[PATH_MAX+NAME_MAX];
char udev_config_filename[PATH_MAX+NAME_MAX];


static inline char *get_action(void)
{
	char *action;

	action = getenv("ACTION");
	return action;
}

static inline char *get_devpath(void)
{
	char *devpath;

	devpath = getenv("DEVPATH");
	return devpath;
}

static inline char *get_seqnum(void)
{
	char *seqnum;

	seqnum = getenv("SEQNUM");
	return seqnum;
}

static void get_dirs(void)
{
	char *temp;
	char *udev_db = UDEV_DB;
	char *udev_config = UDEV_CONFIG_FILE;
	char *udev_permission = UDEV_CONFIG_PERMISSION_FILE;
	int retval;

	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
	if (retval)
		dbg("sysfs_get_mnt_path failed");

	/* see if we should try to override any of the default values */
	temp = getenv("UDEV_TEST");
	if (temp != NULL) {
		/* hm testing is happening, use the specified values, if they are present */
		temp = getenv("UDEV_SYSFS_PATH");
		if (temp)
			strncpy(sysfs_path, temp, sizeof(sysfs_path));
		temp = getenv("UDEV_CONFIG_DIR");
		if (temp)
			udev_config_dir = temp;
		temp = getenv("UDEV_ROOT");
		if (temp)
			udev_root = temp;
		temp = getenv("UDEV_DB");
		if (temp)
			udev_db = temp;
		temp = getenv("UDEV_CONFIG_FILE");
		if (temp)
			udev_config = temp;
		temp = getenv("UDEV_PERMISSION_FILE");
		if (temp)
			udev_permission = temp;
	}
	dbg("sysfs_path = %s", sysfs_path);

	strncpy(udev_db_filename, udev_config_dir, sizeof(udev_db_filename));
	strncat(udev_db_filename, udev_db, sizeof(udev_db_filename));

	strncpy(udev_config_filename, udev_config_dir, sizeof(udev_config_filename));
	strncat(udev_config_filename, udev_config, sizeof(udev_config_filename));
	
	strncpy(udev_config_permission_filename, udev_config_dir, sizeof(udev_config_permission_filename));
	strncat(udev_config_permission_filename, udev_permission, sizeof(udev_config_permission_filename));
}

int main(int argc, char **argv, char **envp)
{
	char *action;
	char *devpath;
	char *subsystem;
	int retval = -EINVAL;
	
	main_argv = argv;
	main_envp = envp;

	dbg("version %s", UDEV_VERSION);

	if (argc != 2) {
		dbg ("unknown number of arguments");
		goto exit;
	}

	subsystem = argv[1];

	devpath = get_devpath();
	if (!devpath) {
		dbg ("no devpath?");
		goto exit;
	}
	dbg("looking at %s", devpath);

	/* we only care about class devices and block stuff */
	if (!strstr(devpath, "class") &&
	    !strstr(devpath, "block")) {
		dbg("not block or class");
		goto exit;
	}

	/* but we don't care about net class devices */
	if (strcmp(subsystem, "net") == 0) {
		dbg("don't care about net devices");
		goto exit;
	}

	action = get_action();
	if (!action) {
		dbg ("no action?");
		goto exit;
	}

	/* initialize udev database */
	get_dirs();
	retval = udevdb_init(UDEVDB_DEFAULT);
	if (retval != 0) {
		dbg("Unable to initialize database.");
		goto exit;
	}

	/* initialize the naming deamon */
	namedev_init();

	if (strcmp(action, "add") == 0)
		retval = udev_add_device(devpath, subsystem);

	else if (strcmp(action, "remove") == 0)
		retval = udev_remove_device(devpath, subsystem);

	else {
		dbg("Unknown action: %s", action);
		retval = -EINVAL;
	}
	udevdb_exit();

exit:	
	return retval;
}