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Sourcecode: udev version File versions

udev_config.c

/*
 * udev_config.c
 *
 * Userspace devfs
 *
 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
 *
 *
 *    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 "libsysfs/sysfs/libsysfs.h"
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "udev_version.h"
#include "logging.h"
#include "udev_rules.h"

/* global variables */
char sysfs_path[PATH_SIZE];
char udev_root[PATH_SIZE];
char udev_db_path[PATH_SIZE];
char udev_rules_filename[PATH_SIZE];
char udev_config_filename[PATH_SIZE];
int udev_log;
int udev_dev_d;
int udev_hotplug_d;


static int string_is_true(const char *str)
{
      if (strcasecmp(str, "true") == 0)
            return 1;
      if (strcasecmp(str, "yes") == 0)
            return 1;
      if (strcasecmp(str, "1") == 0)
            return 1;
      return 0;
}

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 void init_variables(void)
{
      const char *env;

      /* If any config values are specified, they will override these values. */
      strcpy(udev_root, UDEV_ROOT);
      strcpy(udev_db_path, UDEV_DB);
      strcpy(udev_config_filename, UDEV_CONFIG_FILE);
      strcpy(udev_rules_filename, UDEV_RULES_FILE);

      udev_log = string_is_true(UDEV_LOG_DEFAULT);

      udev_dev_d = 1;
      env = getenv("UDEV_NO_DEVD");
      if (env && string_is_true(env))
            udev_dev_d = 0;

      udev_hotplug_d = 1;
      env = getenv("UDEV_NO_HOTPLUGD");
      if (env && string_is_true(env))
            udev_hotplug_d = 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) {
            dbg("can't open '%s' as config file", udev_config_filename);
            return -ENODEV;
      }
      dbg("reading '%s' as config file", udev_config_filename);

      /* 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)) {
                  info("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;

            strlcpy(line, bufline, count);
            dbg("read '%s'", line);

            linepos = line;
            retval = get_key(&linepos, &variable, &value);
            if (retval != 0) {
                  info("error parsing %s, line %d:%d", udev_config_filename, lineno, (int) (linepos-line));
                  continue;
            }

            dbg("variable='%s', value='%s'", variable, value);

            if (strcasecmp(variable, "udev_root") == 0) {
                  strlcpy(udev_root, value, sizeof(udev_root));
                  no_trailing_slash(udev_root);
                  continue;
            }

            if (strcasecmp(variable, "udev_db") == 0) {
                  strlcpy(udev_db_path, value, sizeof(udev_db_path));
                  no_trailing_slash(udev_db_path);
                  continue;
            }

            if (strcasecmp(variable, "udev_rules") == 0) {
                  strlcpy(udev_rules_filename, value, sizeof(udev_rules_filename));
                  no_trailing_slash(udev_rules_filename);
                  continue;
            }

            if (strcasecmp(variable, "udev_log") == 0) {
                  udev_log = string_is_true(value);
                  continue;
            }
      }

      file_unmap(buf, bufsize);
      return retval;
}

void udev_init_config(void)
{

      init_variables();
      sysfs_get_mnt_path(sysfs_path, sizeof(sysfs_path));

      /* see if we should try to override any of the default values */
      if (getenv("UDEV_TEST") != NULL) {
            char *temp;

            temp = getenv("SYSFS_PATH");
            if (temp != NULL) {
                  strlcpy(sysfs_path, temp, sizeof(sysfs_path));
                  no_trailing_slash(sysfs_path);
            }

            temp = getenv("UDEV_CONFIG_FILE");
            if (temp != NULL)
                  strlcpy(udev_config_filename, temp, sizeof(udev_config_filename));
      }

      parse_config_file();
      dbg("sysfs_path='%s'", sysfs_path);
      dbg("udev_root='%s'", udev_root);
      dbg("udev_config_filename='%s'", udev_config_filename);
      dbg("udev_db_path='%s'", udev_db_path);
      dbg("udev_rules_filename='%s'", udev_rules_filename);
      dbg("udev_log=%d", udev_log);
}

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