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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" | |
54988802 | 37 | #include "logging.h" |
e8baccca GKH |
38 | #include "namedev.h" |
39 | #include "libsysfs/libsysfs.h" | |
40 | ||
41 | /* global variables */ | |
42 | char sysfs_path[SYSFS_PATH_MAX]; | |
e8baccca GKH |
43 | char udev_root[PATH_MAX]; |
44 | char udev_db_filename[PATH_MAX+NAME_MAX]; | |
3836a3c4 | 45 | char udev_permissions_filename[PATH_MAX+NAME_MAX]; |
e8baccca GKH |
46 | char udev_rules_filename[PATH_MAX+NAME_MAX]; |
47 | char udev_config_filename[PATH_MAX+NAME_MAX]; | |
48 | char default_mode_str[NAME_MAX]; | |
49 | ||
50 | ||
51 | static void init_variables(void) | |
52 | { | |
3836a3c4 GKH |
53 | /* fill up the defaults. |
54 | * If any config values are specified, they will | |
55 | * override these values. */ | |
e8baccca | 56 | strfieldcpy(udev_root, UDEV_ROOT); |
3836a3c4 GKH |
57 | strfieldcpy(udev_db_filename, UDEV_DB); |
58 | strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE); | |
59 | strfieldcpy(udev_rules_filename, UDEV_RULES_FILE); | |
60 | strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE); | |
e8baccca GKH |
61 | } |
62 | ||
63 | #define set_var(_name, _var) \ | |
64 | if (strcasecmp(variable, _name) == 0) { \ | |
65 | dbg_parse("%s = '%s'", _name, value); \ | |
66 | strncpy(_var, value, sizeof(_var)); \ | |
67 | } | |
68 | ||
69 | static int parse_config_file(void) | |
70 | { | |
71 | char line[255]; | |
72 | char *temp; | |
73 | char *variable; | |
74 | char *value; | |
75 | FILE *fd; | |
76 | int lineno = 0; | |
77 | int retval = 0; | |
78 | ||
79 | fd = fopen(udev_config_filename, "r"); | |
80 | if (fd != NULL) { | |
81 | dbg("reading '%s' as config file", udev_config_filename); | |
82 | } else { | |
83 | dbg("can't open '%s' as config file", udev_config_filename); | |
84 | return -ENODEV; | |
85 | } | |
86 | ||
87 | /* loop through the whole file */ | |
88 | while (1) { | |
89 | /* get a line */ | |
90 | temp = fgets(line, sizeof(line), fd); | |
91 | if (temp == NULL) | |
92 | goto exit; | |
93 | lineno++; | |
94 | ||
95 | dbg_parse("read '%s'", temp); | |
96 | ||
97 | /* eat the whitespace at the beginning of the line */ | |
98 | while (isspace(*temp)) | |
99 | ++temp; | |
100 | ||
101 | /* empty line? */ | |
102 | if (*temp == 0x00) | |
103 | continue; | |
104 | ||
105 | /* see if this is a comment */ | |
106 | if (*temp == COMMENT_CHARACTER) | |
107 | continue; | |
108 | ||
109 | retval = get_pair(&temp, &variable, &value); | |
110 | if (retval) | |
111 | break; | |
112 | ||
113 | dbg_parse("variable = '%s', value = '%s'", variable, value); | |
114 | ||
115 | set_var("udev_root", udev_root); | |
116 | set_var("udev_db", udev_db_filename); | |
117 | set_var("udev_rules", udev_rules_filename); | |
3836a3c4 | 118 | set_var("udev_permissions", udev_permissions_filename); |
e8baccca GKH |
119 | set_var("default_mode", default_mode_str); |
120 | } | |
121 | dbg_parse("%s:%d:%Zd: error parsing '%s'", udev_config_filename, | |
122 | lineno, temp - line, temp); | |
123 | exit: | |
124 | fclose(fd); | |
125 | return retval; | |
126 | } | |
127 | ||
128 | static void get_dirs(void) | |
129 | { | |
130 | char *temp; | |
e8baccca GKH |
131 | int retval; |
132 | ||
133 | retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); | |
134 | if (retval) | |
135 | dbg("sysfs_get_mnt_path failed"); | |
136 | ||
137 | /* see if we should try to override any of the default values */ | |
138 | temp = getenv("UDEV_TEST"); | |
139 | if (temp != NULL) { | |
140 | /* hm testing is happening, use the specified values, if they are present */ | |
141 | temp = getenv("SYSFS_PATH"); | |
142 | if (temp) | |
143 | strfieldcpy(sysfs_path, temp); | |
e8baccca GKH |
144 | temp = getenv("UDEV_CONFIG_FILE"); |
145 | if (temp) | |
3836a3c4 | 146 | strfieldcpy(udev_config_filename, temp); |
e8baccca GKH |
147 | } |
148 | dbg("sysfs_path='%s'", sysfs_path); | |
149 | ||
e8baccca GKH |
150 | dbg_parse("udev_root = %s", udev_root); |
151 | dbg_parse("udev_config_filename = %s", udev_config_filename); | |
152 | dbg_parse("udev_db_filename = %s", udev_db_filename); | |
153 | dbg_parse("udev_rules_filename = %s", udev_rules_filename); | |
3836a3c4 | 154 | dbg_parse("udev_permissions_filename = %s", udev_permissions_filename); |
e8baccca GKH |
155 | parse_config_file(); |
156 | ||
157 | dbg_parse("udev_root = %s", udev_root); | |
158 | dbg_parse("udev_config_filename = %s", udev_config_filename); | |
159 | dbg_parse("udev_db_filename = %s", udev_db_filename); | |
160 | dbg_parse("udev_rules_filename = %s", udev_rules_filename); | |
3836a3c4 | 161 | dbg_parse("udev_permissions_filename = %s", udev_permissions_filename); |
e8baccca GKH |
162 | } |
163 | ||
164 | void udev_init_config(void) | |
165 | { | |
166 | init_variables(); | |
167 | get_dirs(); | |
168 | } | |
169 | ||
170 |