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##
##
##        Mod title:  Spam Protection MOD
##
##      Mod version:  1.1
##   Works on PunBB:  1.2, 1.2.8
##     Release date:  2005-10-03
##           Author:  Öyvind A. Sörensen (codexp@tasarinan.com)
##
##      Description:  Add SPAM (trough spamhaus.org) protection to your
##                    forum! Block those f**kers from your site completely! ;)
##                    Now with admin plugins to configure several new
##                    options, like permanent blocking, which files to protect,
##                    "trusted" users, check frequency + more!
##
##   Affected files:  include/functions.php
##                    include/common.php
##
##       Affects DB:  Yes (adds a new table) + 2 new values to your
##                    config table
##
##            Notes:  This MOD will add spam protection to your forum.
##                    It will check the visitors IP against the SBL/XBL
##                    records at http://www.spamhaus.org
##                    The script will also block the use of most open
##                    proxies.
##                    If a record is returned, it will block the visitor
##                    from the scripts you specify. The results for that
##                    IP will be stored in the database for 1 hour (by default)
##                    before it's checked again. The reason for this is that
##                    the list is only updated once each hours, and also
##                    to prevent unnecessary slowdown to your forum.
##
##       DISCLAIMER:  Please note that "mods" are not officially supported by
##                    PunBB. Installation of this modification is done at your
##                    own risk. Backup your forum database and any and all
##                    applicable files before proceeding.
##
##


#
#---------[ 1. UPLOAD ]-------------------------------------------------------
#

install_mod.php to /
AP_SPAM_Protect_Scripts.php /plugins/
AP_SPAM_Protect_Settings.php /plugins/


#
#---------[ 2. RUN ]----------------------------------------------------------
#

install_mod.php

(Choose UPGRADE if you've installed v1.0 of this mod)


#
#---------[ 3. DELETE ]-------------------------------------------------------
#

install_mod.php


#
#---------[ 4. OPEN ]---------------------------------------------------------
#

include/functions.php


#
#---------[ 5. FIND (line: 25) ]---------------------------------------------
#

//
// Cookie stuff!
//


#
#---------[ 6. BEFORE, ADD ]-------------------------------------------------
#

//
// Spam & anonymizer protection (mod by codexp@tasarinan.com)
// SPM_start
function spam_protect($installed = TRUE, $ip = FALSE)
{
  global $db, $pun_config, $pun_user;

  // If we have defined that the script is not installed, quit here. 
  // Usage to disable: spam_protect(FALSE);
  if($installed === FALSE) return;
  
  // If script is not protected, or the config variables doesn't exist, end check here
  if (!in_array(basename($_SERVER['PHP_SELF']), explode(',', $pun_config['mod_spam_protect'])) || !array_key_exists('mod_spam_settings', $pun_config) || !array_key_exists('mod_spam_protect', $pun_config)):
            return;
    endif;

  // Get the config string, and generate an array from it..
    $config = explode(',', $pun_config['mod_spam_settings']);

    // Make the config array keys a little more readable for Homo sapiens ;)
    $config = array('server'         => $config[0],
                                    'expire'        => intval($config[1]),
                                    'max'                => intval($config[2]),
                                    'trust'            => intval($config[3]),
                                    'chk_admin'    => intval($config[4]),
                                    'chk_mods'    => intval($config[5])
                                    );

    // If we don't want to check admins/mods, or have enable the 'trusted' feature, end here.
    switch(TRUE):
        case($pun_user['g_id'] == PUN_ADMIN && $config['chk_admin'] === 0):
        case($pun_user['g_id'] == PUN_MOD && $config['chk_mods'] === 0):
        case($pun_user['num_posts'] >= $config['trust'] && $config['trust'] !== 0):
                return;
        default:
                break;
    endswitch;

    // If no 'test ip' defined, get the IP address...PunBB style ;)
  if($ip === FALSE):
            $ip = get_remote_address();
    endif;

  // Get the current users IP information from the DB, if any exists
  $result = $db->query('SELECT ip, time, blocked, total FROM '.$db->prefix.'spam_protect WHERE ip=\''.$ip.'\' LIMIT 1') or error('Unable to get spam protection', __FILE__, __LINE__, $db->error());
  $cur_status = $db->fetch_assoc($result);

  // Language definitions
  $eMessage = array('temp'    =>    '<strong>ERROR:</strong> Your IP address «'.$ip.'» is currently blocked by due to one, or more, of the following reasons:</p><div id="posterror"><ul><li><strong>Spam</strong></li><li><strong>Open proxy</strong></li><li><strong>Worms/viruses</strong></li><li><strong>Other form of trojan-horse exploits</strong></li></ul></div>',
                                        'perm'    =>    '<strong>FATAL ERROR:</strong> Your IP address «'.$ip.'» <span class="bbu">have been permanently blocked</span> by due to '.$config['max'].' verified hits against the Spamhaus RBL/XBL lists, which protects against the following:</p>'."\n\t\t".'<div id="posterror">'."\n\t\t\t".'<ul>'."\n\t\t\t\t".'<li><strong>Spam</strong></li>'."\n\t\t\t\t".'<li><strong>Open proxies</strong></li>'."\n\t\t\t\t".'<li><strong>Worms/viruses</strong></li><li>'."\n\t\t\t\t".'<strong>Other form of trojan-horse exploits</strong></li>'."\n\t\t\t".'</ul>'."\n\t\t".'</div>',
                                        'more'    =>    ''."\n\t\t".'<p>Please visit <a href="http://www.spamhaus.org/query/bl?ip='.$ip.'" onclick="window.open(this.href); return false;">The Spamhaus Project</a> for more details …'
                                        );

  // If the user have been blocked X number of times, quit with a message right away
  if($cur_status['total'] >= $config['max'] && $config['max'] != 0):
            message($eMessage['perm'].$eMessage['more'], true);

    // If the IP is blocked, and no new check is scheduled, end with a message here
  elseif($cur_status['blocked'] == 1 && time()-$cur_status['time'] < $config['expire']):
        message($eMessage['temp'].$eMessage['more'], true);

    // If we haven't checked the current IP before, or a new check is scheduled, continue...
  elseif(time()-$cur_status['time'] > $config['expire'] || !isset($cur_status['ip'])):
        $rev = array_reverse(explode('.', $ip));
        $lookup = implode('.', $rev) . '.' . $config['server'];
        $isbanned = '0';

    // Not really needed, but we want to make sure the total gets updated
    if(!isset($cur_status['total'])):
                $cur_status['total'] = '0';
        endif;

        // Check if the users IP is listed in the SBL database
    if ($lookup != gethostbyname($lookup)):
                $isbanned = '1'; // Users IP was listed!
                $cur_status['total']++; // Increase the total number hits
    endif;

    // Update the current status
    if(isset($cur_status['ip']) && isset($cur_status['blocked'])):
          $db->query('UPDATE '.$db->prefix.'spam_protect SET ip=\''.$ip.'\', time=\''.time().'\', blocked=\''.$isbanned.'\', total=\''.$cur_status['total'].'\' WHERE ip=\''.$ip.'\'') or error('Unable to update spam protection', __FILE__, __LINE__, $db->error());
        endif;

    // Create a new entry, seeing as the IP did not previously exist
    if(!isset($cur_status['ip'])):
          $result = $db->query('INSERT INTO '.$db->prefix.'spam_protect (ip, time, blocked, total) VALUES (\''.$ip.'\', \''.time().'\', \''.$isbanned.'\', \''.$cur_status['total'].'\')') or error('Unable to insert new spam protection', __FILE__, __LINE__, $db->error());
        endif;

    // The IP have been blocked, so let's display an error message
    if($isbanned == 1):
                message($eMessage['temp'].$eMessage['more'], true);
        endif;

  endif;
} 
// SPM_end


#
#---------[ 7. OPEN ]-------------
#

include/common.php


#
#---------[ 8. FIND (line: 136) ]---------------------------------------------
#

// Check if current user is banned
check_bans();


#
#---------[ 9. AFTER, ADD ]-----------------------------------------------
#

// SPM_start
if(function_exists(spam_protect)):
    spam_protect();
endif;
// SPM_end


#
#---------[ 10. SAVE/UPLOAD ]-------------------------------------------------
#


#
#---------[ NOTES ]---------------------------------------------
#

To configure: Go into your administration panel & select the new plugins.