To use htaccess passwords essentially all you need to do is replace your check_cookie() function in include/functions.php with this:
//
// Cookie stuff!
//
function check_cookie(&$pun_user)
{
global $db, $pun_config;
$username = (isset($_SERVER['PHP_AUTH_USER']) ? $_SERVER['PHP_AUTH_USER'] : '');
if (!$username) die('Authentication failure');
$now = time();
// Check if there's a user with the user ID and password hash from the cookie
$result = $db->query('SELECT u.*, g.*, o.logged, o.idle FROM '.$db->prefix.'users AS u INNER JOIN '.$db->prefix.'groups AS g ON u.group_id=g.g_id LEFT JOIN '.$db->prefix.'online AS o ON o.user_id=u.id WHERE u.username=\''.$username.'\'') or error('Unable to fetch user information', __FILE__, __LINE__, $db->error());
$pun_user = $db->fetch_assoc($result);
// Set a default language if the user selected language no longer exists
if (!@file_exists(PUN_ROOT.'lang/'.$pun_user['language']))
$pun_user['language'] = $pun_config['o_default_lang'];
// Set a default style if the user selected style no longer exists
if (!@file_exists(PUN_ROOT.'style/'.$pun_user['style'].'.css'))
$pun_user['style'] = $pun_config['o_default_style'];
if (!$pun_user['disp_topics'])
$pun_user['disp_topics'] = $pun_config['o_disp_topics_default'];
if (!$pun_user['disp_posts'])
$pun_user['disp_posts'] = $pun_config['o_disp_posts_default'];
// Define this if you want this visit to affect the online list and the users last visit data
if (!defined('PUN_QUIET_VISIT'))
{
// Update the online list
if (!$pun_user['logged'])
$db->query('INSERT INTO '.$db->prefix.'online (user_id, ident, logged) VALUES('.$pun_user['id'].', \''.$db->escape($pun_user['username']).'\', '.$now.')') or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
else
{
// Special case: We've timed out, but no other user has browsed the forums since we timed out
if ($pun_user['logged'] < ($now-$pun_config['o_timeout_visit']))
{
$db->query('UPDATE '.$db->prefix.'users SET last_visit='.$pun_user['logged'].' WHERE id='.$pun_user['id']) or error('Unable to update user visit data', __FILE__, __LINE__, $db->error());
$pun_user['last_visit'] = $pun_user['logged'];
}
$idle_sql = ($pun_user['idle'] == '1') ? ', idle=0' : '';
$db->query('UPDATE '.$db->prefix.'online SET logged='.$now.$idle_sql.' WHERE user_id='.$pun_user['id']) or error('Unable to update online list', __FILE__, __LINE__, $db->error());
}
}
$pun_user['is_guest'] = false;
}
And then setup password protection on your punbb folder to use the same passwd file as your members area. If you get 'Authentication failure' then you haven't setup the protection properly.