function conf_init in Drupal 5

Same name and namespace in other branches

1. 4 includes/bootstrap.inc \conf_init()
2. 6 includes/bootstrap.inc \conf_init()

Loads the configuration and sets the base URL, cookie domain, and session name correctly.

1 call to conf_init()

_drupal_bootstrap in includes/bootstrap.inc

File

includes/bootstrap.inc, line 249

Functions that need to be loaded on every Drupal request.

Code

function conf_init() {
  global $base_url, $base_path, $base_root;

  // Export the following settings.php variables to the global namespace
  global $db_url, $db_prefix, $cookie_domain, $conf, $installed_profile;
  $conf = array();
  if (isset($_SERVER['HTTP_HOST'])) {

    // As HTTP_HOST is user input, ensure it only contains characters allowed
    // in hostnames. See RFC 952 (and RFC 2181).
    // $_SERVER['HTTP_HOST'] is lowercased here per specifications.
    $_SERVER['HTTP_HOST'] = strtolower($_SERVER['HTTP_HOST']);
    if (!drupal_valid_http_host($_SERVER['HTTP_HOST'])) {

      // HTTP_HOST is invalid, e.g. if containing slashes it may be an attack.
      header('HTTP/1.1 400 Bad Request');
      exit;
    }
  }
  else {

    // Some pre-HTTP/1.1 clients will not send a Host header. Ensure the key is
    // defined for E_ALL compliance.
    $_SERVER['HTTP_HOST'] = '';
  }
  include_once './' . conf_path() . '/settings.php';
  if (isset($base_url)) {

    // Parse fixed base URL from settings.php.
    $parts = parse_url($base_url);
    if (!isset($parts['path'])) {
      $parts['path'] = '';
    }
    $base_path = $parts['path'] . '/';

    // Build $base_root (everything until first slash after "scheme://").
    $base_root = substr($base_url, 0, strlen($base_url) - strlen($parts['path']));
  }
  else {

    // Create base URL
    $base_root = isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on' ? 'https' : 'http';
    $base_url = $base_root .= '://' . $_SERVER['HTTP_HOST'];

    // $_SERVER['SCRIPT_NAME'] can, in contrast to $_SERVER['PHP_SELF'], not
    // be modified by a visitor.
    if ($dir = trim(dirname($_SERVER['SCRIPT_NAME']), '\\,/')) {
      $base_path = "/{$dir}";
      $base_url .= $base_path;
      $base_path .= '/';
    }
    else {
      $base_path = '/';
    }
  }
  if (!$cookie_domain) {

    // If the $cookie_domain is empty, try to use the session.cookie_domain.
    $cookie_domain = ini_get('session.cookie_domain');
  }
  if ($cookie_domain) {

    // If the user specifies the cookie domain, also use it for session name.
    $session_name = $cookie_domain;
  }
  else {

    // Otherwise use $base_url as session name, without the protocol
    // to use the same session identifiers across http and https.
    list(, $session_name) = explode('://', $base_url, 2);

    // We try to set the cookie domain to the hostname.
    // We escape the hostname because it can be modified by a visitor.
    if (!empty($_SERVER['HTTP_HOST'])) {
      $cookie_domain = check_plain($_SERVER['HTTP_HOST']);
    }
  }

  // To prevent session cookies from being hijacked, a user can configure the
  // SSL version of their website to only transfer session cookies via SSL by
  // using PHP's session.cookie_secure setting. The browser will then use two
  // separate session cookies for the HTTPS and HTTP versions of the site. So we
  // must use different session identifiers for HTTPS and HTTP to prevent a
  // cookie collision.
  if (ini_get('session.cookie_secure')) {
    $session_name .= 'SSL';
  }

  // Strip leading periods, www., and port numbers from cookie domain.
  $cookie_domain = ltrim($cookie_domain, '.');
  if (strpos($cookie_domain, 'www.') === 0) {
    $cookie_domain = substr($cookie_domain, 4);
  }
  $cookie_domain = explode(':', $cookie_domain);
  $cookie_domain = '.' . $cookie_domain[0];

  // Per RFC 2109, cookie domains must contain at least one dot other than the
  // first. For hosts such as 'localhost' or IP Addresses we don't set a cookie domain.
  if (count(explode('.', $cookie_domain)) > 2 && !is_numeric(str_replace('.', '', $cookie_domain))) {
    ini_set('session.cookie_domain', $cookie_domain);
  }
  session_name('SESS' . md5($session_name));
}