udev_config.c revision 1aa1e24848903d11780db1ade355be73ad61a937
/*
* udev_config.c
*
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004, 2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 <ctype.h>
#include <syslog.h>
#include "udev.h"
/* global variables */
char udev_root[PATH_SIZE];
char udev_config_filename[PATH_SIZE];
char udev_rules_filename[PATH_SIZE];
int udev_log_priority;
int udev_run;
static int get_key(char **line, char **key, char **value)
{
char *linepos;
char *temp;
linepos = *line;
if (!linepos)
return -1;
/* skip whitespace */
while (isspace(linepos[0]))
linepos++;
/* get the key */
*key = linepos;
while (1) {
linepos++;
if (linepos[0] == '\0')
return -1;
if (isspace(linepos[0]))
break;
if (linepos[0] == '=')
break;
}
/* terminate key */
linepos[0] = '\0';
linepos++;
/* skip whitespace */
while (isspace(linepos[0]))
linepos++;
/* get the value*/
if (linepos[0] == '"')
linepos++;
else
return -1;
*value = linepos;
temp = strchr(linepos, '"');
if (!temp)
return -1;
temp[0] = '\0';
return 0;
}
static int parse_config_file(void)
{
char line[LINE_SIZE];
char *bufline;
char *linepos;
char *variable;
char *value;
char *buf;
size_t bufsize;
size_t cur;
size_t count;
int lineno;
int retval = 0;
if (file_map(udev_config_filename, &buf, &bufsize) != 0) {
err("can't open '%s' as config file: %s", udev_config_filename, strerror(errno));
return -ENODEV;
}
/* loop through the whole file */
lineno = 0;
cur = 0;
while (cur < bufsize) {
count = buf_get_line(buf, bufsize, cur);
bufline = &buf[cur];
cur += count+1;
lineno++;
if (count >= sizeof(line)) {
err("line too long, conf line skipped %s, line %d", udev_config_filename, lineno);
continue;
}
/* eat the whitespace */
while ((count > 0) && isspace(bufline[0])) {
bufline++;
count--;
}
if (count == 0)
continue;
/* see if this is a comment */
if (bufline[0] == COMMENT_CHARACTER)
continue;
memcpy(line, bufline, count);
line[count] = '\0';
linepos = line;
retval = get_key(&linepos, &variable, &value);
if (retval != 0) {
err("error parsing %s, line %d:%d", udev_config_filename, lineno, (int) (linepos-line));
continue;
}
if (strcasecmp(variable, "udev_root") == 0) {
strlcpy(udev_root, value, sizeof(udev_root));
remove_trailing_chars(udev_root, '/');
continue;
}
if (strcasecmp(variable, "udev_rules") == 0) {
strlcpy(udev_rules_filename, value, sizeof(udev_rules_filename));
remove_trailing_chars(udev_rules_filename, '/');
continue;
}
if (strcasecmp(variable, "udev_log") == 0) {
udev_log_priority = log_priority(value);
continue;
}
}
file_unmap(buf, bufsize);
return retval;
}
void udev_config_init(void)
{
const char *env;
strcpy(udev_root, UDEV_ROOT);
strcpy(udev_config_filename, UDEV_CONFIG_FILE);
strcpy(udev_rules_filename, UDEV_RULES_FILE);
udev_log_priority = LOG_ERR;
udev_run = 1;
/* disable RUN key execution */
env = getenv("UDEV_RUN");
if (env && !string_is_true(env))
udev_run = 0;
env = getenv("UDEV_CONFIG_FILE");
if (env) {
strlcpy(udev_config_filename, env, sizeof(udev_config_filename));
remove_trailing_chars(udev_config_filename, '/');
}
parse_config_file();
env = getenv("UDEV_ROOT");
if (env) {
strlcpy(udev_root, env, sizeof(udev_root));
remove_trailing_chars(udev_root, '/');
}
env = getenv("UDEV_LOG");
if (env)
udev_log_priority = log_priority(env);
dbg("UDEV_CONFIG_FILE='%s'", udev_config_filename);
dbg("udev_root='%s'", udev_root);
dbg("udev_rules='%s'", udev_rules_filename);
dbg("udev_log=%d", udev_log_priority);
}