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e8baccca GKH |
1 | /* |
2 | * udev_config.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
274812b5 | 6 | * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com> |
e8baccca GKH |
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 | ||
c80da508 | 35 | #include "libsysfs/sysfs/libsysfs.h" |
e8baccca | 36 | #include "udev.h" |
c81b35c0 | 37 | #include "udev_lib.h" |
e8baccca | 38 | #include "udev_version.h" |
54988802 | 39 | #include "logging.h" |
e8baccca | 40 | #include "namedev.h" |
e8baccca GKH |
41 | |
42 | /* global variables */ | |
43 | char sysfs_path[SYSFS_PATH_MAX]; | |
e8baccca GKH |
44 | char udev_root[PATH_MAX]; |
45 | char udev_db_filename[PATH_MAX+NAME_MAX]; | |
3836a3c4 | 46 | char udev_permissions_filename[PATH_MAX+NAME_MAX]; |
e8baccca GKH |
47 | char udev_rules_filename[PATH_MAX+NAME_MAX]; |
48 | char udev_config_filename[PATH_MAX+NAME_MAX]; | |
765cbd97 | 49 | char default_mode_str[MODE_SIZE]; |
74c73ef9 | 50 | char default_owner_str[OWNER_SIZE]; |
51 | char default_group_str[GROUP_SIZE]; | |
51a8bb2f | 52 | int udev_log; |
961e4784 | 53 | int udev_sleep; |
bbbe503e | 54 | int udev_dev_d; |
e8baccca GKH |
55 | |
56 | ||
51a8bb2f GKH |
57 | static int string_is_true(char *str) |
58 | { | |
59 | if (strcasecmp(str, "true") == 0) | |
60 | return 1; | |
61 | if (strcasecmp(str, "yes") == 0) | |
62 | return 1; | |
c3335930 | 63 | if (strcasecmp(str, "1") == 0) |
64 | return 1; | |
51a8bb2f GKH |
65 | return 0; |
66 | } | |
67 | ||
e8baccca GKH |
68 | static void init_variables(void) |
69 | { | |
c3335930 | 70 | char *env; |
71 | ||
3836a3c4 GKH |
72 | /* fill up the defaults. |
73 | * If any config values are specified, they will | |
74 | * override these values. */ | |
e8baccca | 75 | strfieldcpy(udev_root, UDEV_ROOT); |
3836a3c4 GKH |
76 | strfieldcpy(udev_db_filename, UDEV_DB); |
77 | strfieldcpy(udev_config_filename, UDEV_CONFIG_FILE); | |
78 | strfieldcpy(udev_rules_filename, UDEV_RULES_FILE); | |
79 | strfieldcpy(udev_permissions_filename, UDEV_PERMISSION_FILE); | |
51a8bb2f | 80 | udev_log = string_is_true(UDEV_LOG_DEFAULT); |
961e4784 GKH |
81 | |
82 | udev_sleep = 1; | |
c3335930 | 83 | env = getenv("UDEV_NO_SLEEP"); |
84 | if (env && string_is_true(env)) | |
961e4784 | 85 | udev_sleep = 0; |
bbbe503e KS |
86 | |
87 | udev_dev_d = 1; | |
c3335930 | 88 | env = getenv("UDEV_NO_DEVD"); |
89 | if (env && string_is_true(env)) | |
bbbe503e | 90 | udev_dev_d = 0; |
e8baccca GKH |
91 | } |
92 | ||
274812b5 GKH |
93 | int parse_get_pair(char **orig_string, char **left, char **right) |
94 | { | |
95 | char *temp; | |
96 | char *string = *orig_string; | |
97 | ||
98 | if (!string) | |
99 | return -ENODEV; | |
100 | ||
101 | /* eat any whitespace */ | |
102 | while (isspace(*string) || *string == ',') | |
103 | ++string; | |
104 | ||
105 | /* split based on '=' */ | |
106 | temp = strsep(&string, "="); | |
107 | *left = temp; | |
108 | if (!string) | |
109 | return -ENODEV; | |
110 | ||
111 | /* take the right side and strip off the '"' */ | |
112 | while (isspace(*string)) | |
113 | ++string; | |
114 | if (*string == '"') | |
115 | ++string; | |
116 | else | |
117 | return -ENODEV; | |
118 | ||
119 | temp = strsep(&string, "\""); | |
120 | if (!string || *temp == '\0') | |
121 | return -ENODEV; | |
122 | *right = temp; | |
123 | *orig_string = string; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
e8baccca GKH |
128 | static int parse_config_file(void) |
129 | { | |
3e441450 | 130 | char line[LINE_SIZE]; |
131 | char *bufline; | |
e8baccca GKH |
132 | char *temp; |
133 | char *variable; | |
134 | char *value; | |
c81b35c0 KS |
135 | char *buf; |
136 | size_t bufsize; | |
137 | size_t cur; | |
138 | size_t count; | |
139 | int lineno; | |
e8baccca | 140 | int retval = 0; |
c81b35c0 KS |
141 | |
142 | if (file_map(udev_config_filename, &buf, &bufsize) == 0) { | |
e8baccca GKH |
143 | dbg("reading '%s' as config file", udev_config_filename); |
144 | } else { | |
145 | dbg("can't open '%s' as config file", udev_config_filename); | |
146 | return -ENODEV; | |
147 | } | |
148 | ||
149 | /* loop through the whole file */ | |
c81b35c0 KS |
150 | lineno = 0; |
151 | cur = 0; | |
3e441450 | 152 | while (cur < bufsize) { |
c81b35c0 | 153 | count = buf_get_line(buf, bufsize, cur); |
3e441450 | 154 | bufline = &buf[cur]; |
c81b35c0 | 155 | cur += count+1; |
3e441450 | 156 | lineno++; |
e8baccca | 157 | |
3e441450 | 158 | if (count >= LINE_SIZE) { |
159 | info("line too long, conf line skipped %s, line %d", | |
160 | udev_config_filename, lineno); | |
161 | continue; | |
162 | } | |
e8baccca GKH |
163 | |
164 | /* empty line? */ | |
3e441450 | 165 | if (bufline[0] == '\0' || bufline[0] == '\n') |
e8baccca GKH |
166 | continue; |
167 | ||
3e441450 | 168 | /* eat the whitespace */ |
169 | while (isspace(bufline[0])) { | |
170 | bufline++; | |
171 | count--; | |
172 | } | |
173 | ||
e8baccca | 174 | /* see if this is a comment */ |
3e441450 | 175 | if (bufline[0] == COMMENT_CHARACTER) |
e8baccca GKH |
176 | continue; |
177 | ||
3e441450 | 178 | strncpy(line, bufline, count); |
179 | line[count] = '\0'; | |
180 | temp = line; | |
181 | dbg_parse("read '%s'", temp); | |
182 | ||
274812b5 | 183 | retval = parse_get_pair(&temp, &variable, &value); |
aef6bb13 KS |
184 | if (retval != 0) |
185 | info("%s:%d:%Zd: error parsing '%s'", | |
186 | udev_config_filename, lineno, temp-line, temp); | |
187 | ||
188 | dbg_parse("variable='%s', value='%s'", variable, value); | |
189 | ||
190 | if (strcasecmp(variable, "udev_root") == 0) { | |
191 | strfieldcpy(udev_root, value); | |
192 | leading_slash(udev_root); | |
193 | continue; | |
194 | } | |
195 | ||
196 | if (strcasecmp(variable, "udev_db") == 0) { | |
197 | strfieldcpy(udev_db_filename, value); | |
198 | continue; | |
199 | } | |
200 | ||
201 | if (strcasecmp(variable, "udev_rules") == 0) { | |
202 | strfieldcpy(udev_rules_filename, value); | |
203 | no_leading_slash(udev_rules_filename); | |
204 | continue; | |
205 | } | |
206 | ||
207 | if (strcasecmp(variable, "udev_permissions") == 0) { | |
208 | strfieldcpy(udev_permissions_filename, value); | |
209 | no_leading_slash(udev_permissions_filename); | |
210 | continue; | |
211 | } | |
212 | ||
213 | if (strcasecmp(variable, "default_mode") == 0) { | |
214 | strfieldcpy(default_mode_str, value); | |
215 | continue; | |
216 | } | |
217 | ||
218 | if (strcasecmp(variable, "default_owner") == 0) { | |
219 | strfieldcpy(default_owner_str, value); | |
220 | continue; | |
221 | } | |
222 | ||
223 | if (strcasecmp(variable, "default_group") == 0) { | |
224 | strfieldcpy(default_group_str, value); | |
225 | continue; | |
226 | } | |
227 | ||
228 | if (strcasecmp(variable, "udev_log") == 0) { | |
229 | udev_log = string_is_true(value); | |
230 | continue; | |
231 | } | |
232 | ||
233 | info("%s:%d:%Zd: unknown key '%s'", | |
234 | udev_config_filename, lineno, temp-line, temp); | |
e8baccca | 235 | } |
c81b35c0 KS |
236 | |
237 | file_unmap(buf, bufsize); | |
e8baccca GKH |
238 | return retval; |
239 | } | |
240 | ||
241 | static void get_dirs(void) | |
242 | { | |
243 | char *temp; | |
e8baccca GKH |
244 | int retval; |
245 | ||
246 | retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); | |
247 | if (retval) | |
248 | dbg("sysfs_get_mnt_path failed"); | |
249 | ||
250 | /* see if we should try to override any of the default values */ | |
aef6bb13 | 251 | if (getenv("UDEV_TEST") != NULL) { |
e8baccca | 252 | temp = getenv("SYSFS_PATH"); |
aef6bb13 | 253 | if (temp != NULL) { |
e8baccca | 254 | strfieldcpy(sysfs_path, temp); |
aef6bb13 KS |
255 | no_leading_slash(sysfs_path); |
256 | } | |
257 | ||
e8baccca | 258 | temp = getenv("UDEV_CONFIG_FILE"); |
aef6bb13 | 259 | if (temp != NULL) |
3836a3c4 | 260 | strfieldcpy(udev_config_filename, temp); |
e8baccca | 261 | } |
e8baccca | 262 | |
aef6bb13 | 263 | dbg("sysfs_path='%s'", sysfs_path); |
e8baccca GKH |
264 | dbg_parse("udev_root = %s", udev_root); |
265 | dbg_parse("udev_config_filename = %s", udev_config_filename); | |
266 | dbg_parse("udev_db_filename = %s", udev_db_filename); | |
267 | dbg_parse("udev_rules_filename = %s", udev_rules_filename); | |
3836a3c4 | 268 | dbg_parse("udev_permissions_filename = %s", udev_permissions_filename); |
51a8bb2f | 269 | dbg_parse("udev_log = %d", udev_log); |
aef6bb13 | 270 | |
e8baccca GKH |
271 | parse_config_file(); |
272 | ||
aef6bb13 KS |
273 | dbg("udev_root = %s", udev_root); |
274 | dbg("udev_config_filename = %s", udev_config_filename); | |
275 | dbg("udev_db_filename = %s", udev_db_filename); | |
276 | dbg("udev_rules_filename = %s", udev_rules_filename); | |
277 | dbg("udev_permissions_filename = %s", udev_permissions_filename); | |
278 | dbg("udev_log_str = %d", udev_log); | |
e8baccca GKH |
279 | } |
280 | ||
281 | void udev_init_config(void) | |
282 | { | |
283 | init_variables(); | |
284 | get_dirs(); | |
285 | } |