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e8baccca GKH |
1 | /* |
2 | * udev_config.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | /* define this to enable parsing debugging */ | |
25 | /* #define DEBUG_PARSER */ | |
26 | ||
27 | #include <stdlib.h> | |
28 | #include <string.h> | |
29 | #include <stdio.h> | |
30 | #include <fcntl.h> | |
31 | #include <unistd.h> | |
32 | #include <errno.h> | |
33 | #include <ctype.h> | |
34 | ||
35 | #include "udev.h" | |
36 | #include "udev_version.h" | |
37 | #include "namedev.h" | |
38 | #include "libsysfs/libsysfs.h" | |
39 | ||
40 | /* global variables */ | |
41 | char sysfs_path[SYSFS_PATH_MAX]; | |
e8baccca GKH |
42 | char udev_root[PATH_MAX]; |
43 | char udev_db_filename[PATH_MAX+NAME_MAX]; | |
3836a3c4 | 44 | char udev_permissions_filename[PATH_MAX+NAME_MAX]; |
e8baccca GKH |
45 | char udev_rules_filename[PATH_MAX+NAME_MAX]; |
46 | char udev_config_filename[PATH_MAX+NAME_MAX]; | |
47 | char default_mode_str[NAME_MAX]; | |
48 | ||
49 | ||
50 | static void init_variables(void) | |
51 | { | |
3836a3c4 GKH |
52 | /* fill up the defaults. |
53 | * If any config values are specified, they will | |
54 | * override these values. */ | |
e8baccca | 55 | strfieldcpy(udev_root, UDEV_ROOT); |
3836a3c4 GKH |
56 | strfieldcpy(udev_db_filename, UDEV_DB); |
57 | strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE); | |
58 | strfieldcpy(udev_rules_filename, UDEV_RULES_FILE); | |
59 | strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE); | |
e8baccca GKH |
60 | } |
61 | ||
62 | #define set_var(_name, _var) \ | |
63 | if (strcasecmp(variable, _name) == 0) { \ | |
64 | dbg_parse("%s = '%s'", _name, value); \ | |
65 | strncpy(_var, value, sizeof(_var)); \ | |
66 | } | |
67 | ||
68 | static int parse_config_file(void) | |
69 | { | |
70 | char line[255]; | |
71 | char *temp; | |
72 | char *variable; | |
73 | char *value; | |
74 | FILE *fd; | |
75 | int lineno = 0; | |
76 | int retval = 0; | |
77 | ||
78 | fd = fopen(udev_config_filename, "r"); | |
79 | if (fd != NULL) { | |
80 | dbg("reading '%s' as config file", udev_config_filename); | |
81 | } else { | |
82 | dbg("can't open '%s' as config file", udev_config_filename); | |
83 | return -ENODEV; | |
84 | } | |
85 | ||
86 | /* loop through the whole file */ | |
87 | while (1) { | |
88 | /* get a line */ | |
89 | temp = fgets(line, sizeof(line), fd); | |
90 | if (temp == NULL) | |
91 | goto exit; | |
92 | lineno++; | |
93 | ||
94 | dbg_parse("read '%s'", temp); | |
95 | ||
96 | /* eat the whitespace at the beginning of the line */ | |
97 | while (isspace(*temp)) | |
98 | ++temp; | |
99 | ||
100 | /* empty line? */ | |
101 | if (*temp == 0x00) | |
102 | continue; | |
103 | ||
104 | /* see if this is a comment */ | |
105 | if (*temp == COMMENT_CHARACTER) | |
106 | continue; | |
107 | ||
108 | retval = get_pair(&temp, &variable, &value); | |
109 | if (retval) | |
110 | break; | |
111 | ||
112 | dbg_parse("variable = '%s', value = '%s'", variable, value); | |
113 | ||
114 | set_var("udev_root", udev_root); | |
115 | set_var("udev_db", udev_db_filename); | |
116 | set_var("udev_rules", udev_rules_filename); | |
3836a3c4 | 117 | set_var("udev_permissions", udev_permissions_filename); |
e8baccca GKH |
118 | set_var("default_mode", default_mode_str); |
119 | } | |
120 | dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename, | |
121 | lineno, temp - line, temp); | |
122 | exit: | |
123 | fclose(fd); | |
124 | return retval; | |
125 | } | |
126 | ||
127 | static void get_dirs(void) | |
128 | { | |
129 | char *temp; | |
e8baccca GKH |
130 | int retval; |
131 | ||
132 | retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); | |
133 | if (retval) | |
134 | dbg("sysfs_get_mnt_path failed"); | |
135 | ||
136 | /* see if we should try to override any of the default values */ | |
137 | temp = getenv("UDEV_TEST"); | |
138 | if (temp != NULL) { | |
139 | /* hm testing is happening, use the specified values, if they are present */ | |
140 | temp = getenv("SYSFS_PATH"); | |
141 | if (temp) | |
142 | strfieldcpy(sysfs_path, temp); | |
e8baccca GKH |
143 | temp = getenv("UDEV_CONFIG_FILE"); |
144 | if (temp) | |
3836a3c4 | 145 | strfieldcpy(udev_config_filename, temp); |
e8baccca GKH |
146 | } |
147 | dbg("sysfs_path='%s'", sysfs_path); | |
148 | ||
e8baccca GKH |
149 | dbg_parse("udev_root = %s", udev_root); |
150 | dbg_parse("udev_config_filename = %s", udev_config_filename); | |
151 | dbg_parse("udev_db_filename = %s", udev_db_filename); | |
152 | dbg_parse("udev_rules_filename = %s", udev_rules_filename); | |
3836a3c4 | 153 | dbg_parse("udev_permissions_filename = %s", udev_permissions_filename); |
e8baccca GKH |
154 | parse_config_file(); |
155 | ||
156 | dbg_parse("udev_root = %s", udev_root); | |
157 | dbg_parse("udev_config_filename = %s", udev_config_filename); | |
158 | dbg_parse("udev_db_filename = %s", udev_db_filename); | |
159 | dbg_parse("udev_rules_filename = %s", udev_rules_filename); | |
3836a3c4 | 160 | dbg_parse("udev_permissions_filename = %s", udev_permissions_filename); |
e8baccca GKH |
161 | } |
162 | ||
163 | void udev_init_config(void) | |
164 | { | |
165 | init_variables(); | |
166 | get_dirs(); | |
167 | } | |
168 | ||
169 |