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[elogind.git] / udev_config.c
1 /*
2  * udev_config.c
3  *
4  * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
5  * Copyright (C) 2004, 2005 Kay Sievers <kay.sievers@vrfy.org>
6  *
7  *      This program is free software; you can redistribute it and/or modify it
8  *      under the terms of the GNU General Public License as published by the
9  *      Free Software Foundation version 2 of the License.
10  * 
11  *      This program is distributed in the hope that it will be useful, but
12  *      WITHOUT ANY WARRANTY; without even the implied warranty of
13  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  *      General Public License for more details.
15  * 
16  *      You should have received a copy of the GNU General Public License along
17  *      with this program; if not, write to the Free Software Foundation, Inc.,
18  *      675 Mass Ave, Cambridge, MA 02139, USA.
19  *
20  */
21
22 #include <stdlib.h>
23 #include <string.h>
24 #include <stdio.h>
25 #include <fcntl.h>
26 #include <unistd.h>
27 #include <errno.h>
28 #include <ctype.h>
29 #include <syslog.h>
30
31 #include "libsysfs/sysfs/libsysfs.h"
32 #include "udev_libc_wrapper.h"
33 #include "udev.h"
34 #include "udev_utils.h"
35 #include "udev_version.h"
36 #include "logging.h"
37
38 /* global variables */
39 char sysfs_path[PATH_SIZE];
40 char udev_root[PATH_SIZE];
41 char udev_db_path[PATH_SIZE];
42 char udev_config_filename[PATH_SIZE];
43 char udev_rules_filename[PATH_SIZE];
44 int udev_log_priority;
45 int udev_run;
46
47 static int get_key(char **line, char **key, char **value)
48 {
49         char *linepos;
50         char *temp;
51
52         linepos = *line;
53         if (!linepos)
54                 return -1;
55
56         /* skip whitespace */
57         while (isspace(linepos[0]))
58                 linepos++;
59
60         /* get the key */
61         *key = linepos;
62         while (1) {
63                 linepos++;
64                 if (linepos[0] == '\0')
65                         return -1;
66                 if (isspace(linepos[0]))
67                         break;
68                 if (linepos[0] == '=')
69                         break;
70         }
71
72         /* terminate key */
73         linepos[0] = '\0';
74         linepos++;
75
76         /* skip whitespace */
77         while (isspace(linepos[0]))
78                 linepos++;
79
80         /* get the value*/
81         if (linepos[0] == '"')
82                 linepos++;
83         else
84                 return -1;
85         *value = linepos;
86
87         temp = strchr(linepos, '"');
88         if (!temp)
89                 return -1;
90         temp[0] = '\0';
91
92         return 0;
93 }
94
95 static int parse_config_file(void)
96 {
97         char line[LINE_SIZE];
98         char *bufline;
99         char *linepos;
100         char *variable;
101         char *value;
102         char *buf;
103         size_t bufsize;
104         size_t cur;
105         size_t count;
106         int lineno;
107         int retval = 0;
108
109         if (file_map(udev_config_filename, &buf, &bufsize) != 0) {
110                 err("can't open '%s' as config file", udev_config_filename);
111                 return -ENODEV;
112         }
113
114         /* loop through the whole file */
115         lineno = 0;
116         cur = 0;
117         while (cur < bufsize) {
118                 count = buf_get_line(buf, bufsize, cur);
119                 bufline = &buf[cur];
120                 cur += count+1;
121                 lineno++;
122
123                 if (count >= sizeof(line)) {
124                         err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
125                         continue;
126                 }
127
128                 /* eat the whitespace */
129                 while ((count > 0) && isspace(bufline[0])) {
130                         bufline++;
131                         count--;
132                 }
133                 if (count == 0)
134                         continue;
135
136                 /* see if this is a comment */
137                 if (bufline[0] == COMMENT_CHARACTER)
138                         continue;
139
140                 memcpy(line, bufline, count);
141                 line[count] = '\0';
142
143                 linepos = line;
144                 retval = get_key(&linepos, &variable, &value);
145                 if (retval != 0) {
146                         err("error parsing %s, line %d:%d", udev_config_filename, lineno, (int) (linepos-line));
147                         continue;
148                 }
149
150                 if (strcasecmp(variable, "udev_root") == 0) {
151                         strlcpy(udev_root, value, sizeof(udev_root));
152                         remove_trailing_chars(udev_root, '/');
153                         continue;
154                 }
155
156                 if (strcasecmp(variable, "udev_db") == 0) {
157                         strlcpy(udev_db_path, value, sizeof(udev_db_path));
158                         remove_trailing_chars(udev_db_path, '/');
159                         continue;
160                 }
161
162                 if (strcasecmp(variable, "udev_rules") == 0) {
163                         strlcpy(udev_rules_filename, value, sizeof(udev_rules_filename));
164                         remove_trailing_chars(udev_rules_filename, '/');
165                         continue;
166                 }
167
168                 if (strcasecmp(variable, "udev_log") == 0) {
169                         udev_log_priority = log_priority(value);
170                         continue;
171                 }
172         }
173
174         file_unmap(buf, bufsize);
175         return retval;
176 }
177
178 void udev_init_config(void)
179 {
180         const char *env;
181
182         strcpy(udev_root, UDEV_ROOT);
183         strcpy(udev_db_path, UDEV_DB);
184         strcpy(udev_config_filename, UDEV_CONFIG_FILE);
185         strcpy(udev_rules_filename, UDEV_RULES_FILE);
186         udev_log_priority = LOG_ERR;
187         udev_run = 1;
188         sysfs_get_mnt_path(sysfs_path, sizeof(sysfs_path));
189
190         /* disable RUN key execution */
191         env = getenv("UDEV_RUN");
192         if (env && !string_is_true(env))
193                 udev_run = 0;
194
195         env = getenv("UDEV_CONFIG_FILE");
196         if (env) {
197                 strlcpy(udev_config_filename, env, sizeof(udev_config_filename));
198                 remove_trailing_chars(udev_config_filename, '/');
199         }
200
201         parse_config_file();
202
203         env = getenv("UDEV_LOG");
204         if (env)
205                 udev_log_priority = log_priority(env);
206
207         dbg("sysfs_path='%s'", sysfs_path);
208         dbg("UDEV_CONFIG_FILE='%s'", udev_config_filename);
209         dbg("udev_root='%s'", udev_root);
210         dbg("udev_db='%s'", udev_db_path);
211         dbg("udev_rules='%s'", udev_rules_filename);
212         dbg("udev_log=%d", udev_log_priority);
213 }