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function drupal_valid_http_host in Drupal 6

Same name and namespace in other branches
  1. 5 includes/bootstrap.inc \drupal_valid_http_host()
  2. 7 includes/bootstrap.inc \drupal_valid_http_host()

Validate that a hostname (for example $_SERVER['HTTP_HOST']) is safe.

As $_SERVER['HTTP_HOST'] is user input, ensure it only contains characters allowed in hostnames. See RFC 952 (and RFC 2181). $_SERVER['HTTP_HOST'] is lowercased.

Return value

TRUE if only containing valid characters, or FALSE otherwise.

1 call to drupal_valid_http_host()
conf_init in includes/bootstrap.inc
Loads the configuration and sets the base URL, cookie domain, and session name correctly.

File

includes/bootstrap.inc, line 366
Functions that need to be loaded on every Drupal request.

Code

function drupal_valid_http_host($host) {

  // Limit the length of the host name to 1000 bytes to prevent DoS attacks with
  // long host names.
  return strlen($host) <= 1000 && substr_count($host, '.') <= 100 && substr_count($host, ':') <= 100 && preg_match('/^\\[?(?:[a-zA-Z0-9-:\\]_]+\\.?)+$/', $host);
}