<?php
// +---------------------------------------------+
// |     Copyright © 2003 – 2007 Subdreamer, LLC |
// |     http://www.subdreamer.com               |
// |     This file may not be redistributed.     |
// +---------------------------------------------+

if(!defined('IN_SUBDREAMER'))
  die('Hacking attempt!');


// ###################### START WITH SESSION NOT CREATED #######################

$sessioncreated = false;

// ############################## FORUM SETTINGS ###############################

$tableprefix     = $usersystem['tblprefix'];
$cookietimeout   = $usersystem['cookietimeout'];
$cookieprefix    = $usersystem['cookieprefix'];
$cookiedomain    = '';
$cookiepath      = '/';
$vblicensenumber = $usersystem['extra']; // the extra column holds vb3's license number


// ####################### FIX VBULLETIN 3 COOKIE PREFIX #######################
// vbulletin 3 defaults to bb if a cookieprefix is blank, strange... but whatever!

$cookieprefix = strlen($cookieprefix) ? $cookieprefix : 'bb';


// ####################### GET VBULLETIN 3 SESSION LIMIT #######################
// updating to the vbulletin3's session table will not take place if the limit has been reached

$getsessionlimit = $DB->query_first("SELECT value FROM " . $tableprefix . "setting WHERE varname = 'sessionlimit'");
$sessionlimit    = $getsessionlimit['value'];  // this value should be store in $usersystem['extra'], wasted query imo


// ################################ FIND ALT IP ################################

if(isset($_SERVER['HTTP_CLIENT_IP']))
{
  define('ALT_IP', $_SERVER['HTTP_CLIENT_IP']);
}
else if (isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches))
{
  foreach($matches[0] AS $ip)
  {
    if(!preg_match("#^(10|172\.16|192\.168)\.#", $ip))
    {
      define('ALT_IP', $ip);
      break;
    }
  }
}
else if(isset($_SERVER['HTTP_FROM']))
{
  define('ALT_IP', $_SERVER['HTTP_FROM']);
}
else
{
  define('ALT_IP', $_SERVER['REMOTE_ADDR']);
}


// ################################## DEFINES ##################################

define('SESSION_IDHASH', md5($_SERVER['HTTP_USER_AGENT'] . ALT_IP )); // this should *never* change during a session
define('USER_AGENT', addslashes($_SERVER['HTTP_USER_AGENT']));
define('IPADDRESS', $_SERVER['REMOTE_ADDR']);
define('SESSION_HOST', substr(IPADDRESS, 0, 15));

// Defining timenow in the event this is also called by a developer.  This is 
// initally set in core.php
if(!defined('TIMENOW'))
{
  define('TIMENOW', time());
}


// ############################### CREATE COOKIE ###############################

function CreateCookie($name, $value = '', $permanent = 1)
{
  global $_SERVER, $cookieprefix, $cookiepath, $cookiedomain;

  $name   = $cookieprefix . $name;
  $expire = $permanent ? (TIMENOW + 60 * 60 * 24 * 365) : 0;
  $secure = $_SERVER['SERVER_PORT'] == '443' ? 1 : 0; // secure(1) = using SSL

  setcookie($name, $value, $expire, $cookiepath, $cookiedomain, $secure);
}


// ############################ CREATE SESSION HASH ############################

function CreateSessionHash()
{
  return md5(TIMENOW . SESSION_IDHASH . SESSION_HOST . rand(1, 1000000));
}


// ############################## CREATE SESSION ###############################

function CreateSession($userid = 0)
{
  global $DB, $sessionlimit, $sessioncreated, $tableprefix;

  // setup the session
  $session = array('sessionhash'  => CreateSessionHash(),
                   'userid'       => intval($userid),
                   'host'         => SESSION_HOST,
                   'useragent'    => USER_AGENT,
                   'idhash'       => SESSION_IDHASH,
                   'lastactivity' => TIMENOW);

  // return the session if the sessionlimit has exceeded
  if($sessionlimit > 0)
  {
    $sessions = $DB->query_first("SELECT COUNT(*) AS sessioncount FROM " . $tableprefix . "session");

    if($sessions['sessioncount'] > $sessionlimit)
    {
      return $session;
    }
  }

  // return if we are logging in our logging out (since logging in and out already creates sessions)
  if(isset($_POST['login']) || isset($_GET['logout']))
  {
    return null;
  }

  // insert the session into the database
  $DB->query("INSERT INTO " . $tableprefix . "session (sessionhash, userid, host, useragent, idhash, lastactivity)
              VALUES ('%s', %d, '%s', '%s', '%s', %d)",
              $session['sessionhash'], $session['userid'], $session['host'],
              $session['useragent'], $session['idhash'], $session['lastactivity']);

  // save the sessionhash
  CreateCookie('sessionhash', $session['sessionhash'], 0);

  // set sessioncreated to true so that we don't update this session later on in the script
  // (because it was just created)
  $sessioncreated = true;

  return $session;
}

// ######################### UPDATE LAST VISIT/ACTIVITY ########################

function UpdateLastActivity($userid)
{
	global $DB, $cookietimeout, $tableprefix;

	$lastactivity = $DB->query_first("SELECT lastactivity FROM " . $tableprefix . "user WHERE userid = %d", $userid);

	if (TIMENOW - $lastactivity[0] > $cookietimeout)
	{
		$DB->query("UPDATE " . $tableprefix . "user
					SET lastvisit = lastactivity,
					lastactivity = %d WHERE userid = %d", TIMENOW, $userid);
	}
	else
	{
		$DB->query("UPDATE " . $tableprefix . "user
					SET lastactivity = %d WHERE userid = %d", TIMENOW, $userid);
	}
}


// ############################# FIND SESSION HASH #############################

if(!empty($_POST['s']))
{
  $sessionhash = $_POST['s'];
}
else if(!empty($_GET['s']))
{
  $sessionhash = $_GET['s'];
}
else
{
  $sessionhash = isset($_COOKIE[$cookieprefix . 'sessionhash']) ? $_COOKIE[$cookieprefix . 'sessionhash'] : $_COOKIE['sessionhash'];
}


// ############################# CONTINUE SESSION ##############################

if(!empty($sessionhash))
{
  $session = $DB->query_first("SELECT * FROM " . $tableprefix . "session
                               WHERE sessionhash = '%s'
                               AND lastactivity > %d
                               AND host = '%s'
                               AND idhash = '%s'",
                               trim($sessionhash), (TIMENOW - $cookietimeout), SESSION_HOST, SESSION_IDHASH);
}


// ############################### COOKIE LOGIN ################################
// session has expired or does not exist, but the user might still have a userid and password cookies set:

if(empty($session) OR $session['userid'] == 0)
{
  if(!empty($_COOKIE[$cookieprefix . 'userid']) AND
     !empty($_COOKIE[$cookieprefix . 'password']) AND
     is_numeric($_COOKIE[$cookieprefix . 'userid']))
  {
    $eraseusercookie = false;

    if($user = $DB->query_first("SELECT userid, password FROM " . $tableprefix . "user WHERE userid = %d LIMIT 1", $_COOKIE[$cookieprefix . 'userid']))
    {
      if(md5($user['password'] . $vblicensenumber) == $_COOKIE[$cookieprefix . 'password'])
      {
        // combination is valid,

        // delete the old session hash and create a new one
        if(strlen($session['sessionhash']))
        {
          // old session still exists; kill it
          $DB->query("DELETE FROM " . $tableprefix . "session WHERE sessionhash = '%s' LIMIT 1", $session['sessionhash']);
        }

        $session = CreateSession($user['userid']);
      }
      else
      {
        $eraseusercookie = true;
      }
    }
    else
    {
      $eraseusercookie = true;
    }

    if($eraseusercookie)
    {
      // cookie has false information *or maybe the user was deleted*, delete the cookies:
      CreateCookie('userid', '', 1);
      CreateCookie('password', '', 1);
    }
  }
}


// ########################### CREATE GUEST SESSION ############################

if(empty($session))
{
  // still no session. the user is a guest, so try to find this guest's session
  $session = $DB->query_first("SELECT * FROM " . $tableprefix . "session
                               WHERE userid = 0 AND host = '%s'  AND idhash = '%s' LIMIT 1",
                               SESSION_HOST, SESSION_IDHASH);

  // still no session found, create a new one for the guest:
  if(empty($session))
  {
    $session = CreateSession(0);
  }
}


// ############################ SETUP USER VARIABLE ############################

if($session['userid'] == 0)
{
  // fill in guest userinfo for subdreamer
  $user = array('userid'         => 0,
                'usergroupids'   => 1,  // vBulletin 3 - Unregistered / Not Logged In
                'username'       => '',
                'loggedin'       => 0,
                'email'          => '',
                'timezoneoffset' => 0,
                'dstonoff'       => 0,
                'dstauto'        => 1);
}
else if($session['userid'] > 0)
{
  $getuser = $DB->query_first("SELECT * FROM " . $tableprefix . "user WHERE userid = %d", $session['userid']);

  // fill in member userinfo for subdreamer
  $user = array('userid'         => $getuser['userid'],
                'usergroupids'   => $getuser['usergroupid'],
                'username'       => $getuser['username'],
                'loggedin'       => 1,
                'email'          => $getuser['email'],
                'timezoneoffset' => $getuser['timezoneoffset']);

  UpdateLastActivity($user['userid']);

  // bit values: 'dstauto' => 64, 'dstonoff' => 128,
  $user['dstonoff'] = (128 & $getuser['options']) ? 1 : 0;
  $user['dstauto']  = (64  & $getuser['options']) ? 1 : 0;
}


// ############################## UPDATE SESSION ###############################

if(!$sessioncreated)
{
  $DB->query("UPDATE " . $tableprefix . "session SET useragent    = '%s',
                                                     lastactivity = %d
                                               WHERE sessionhash  = '%s'",
                                               USER_AGENT, TIMENOW, $session['sessionhash']);
}


// ################################### LOGIN ###################################

if(isset($_POST['login']) && $_POST['login'] == 'login')
{
  // post data already cleaned
  $loginusername = $_POST['loginusername'];
  $loginpassword = $_POST['loginpassword'];

  if(strlen($loginusername))
  {
    // get userid for given username
    if($getuser = $DB->query_first("SELECT * FROM " . $tableprefix . "user WHERE username = '%s'", $loginusername))
    {
      if($getuser['password'] != md5(md5($loginpassword) . $getuser['salt']) )
      {
        $loginerrors[] = $sdlanguage['wrong_password'];
      }
      else
      {
        // fill in member userinfo for subdreamer
        $user = array('userid'         => $getuser['userid'],
                      'usergroupids'   => $getuser['usergroupid'],
                      'username'       => $getuser['username'],
                      'loggedin'       => 1,
                      'email'          => $getuser['email'],
                      'timezoneoffset' => $getuser['timezoneoffset']);

        // bit values: 'dstauto' => 64, 'dstonoff' => 128,
        $user['dstonoff'] = (128 & $getuser['options']) ? 1 : 0;
        $user['dstauto']  = (64  & $getuser['options']) ? 1 : 0;

        // a sessionhash was created before user logged in, so delete this sessionhash and create a new one
        $DB->query("DELETE FROM " . $tableprefix . "session WHERE sessionhash = '%s' LIMIT 1", $session['sessionhash']);

        // insert new session
        $session['sessionhash'] = CreateSessionHash();

        $DB->query("INSERT INTO " . $tableprefix . "session (sessionhash, userid, host, idhash, lastactivity, loggedin, useragent)
                    VALUES ('%s', %d, '%s', '%s', %d, 1, '%s') ",
                    $session['sessionhash'], intval($getuser['userid']), SESSION_HOST, SESSION_IDHASH, TIMENOW, USER_AGENT);

        // save the sessionhash in the cookie
        CreateCookie('sessionhash', $session['sessionhash'], 1);

        // save the userid and password if the user has selected the 'remember me' option
        if($_POST['rememberme'])
        {
          CreateCookie('userid', $getuser['userid'], 1);
          CreateCookie('password', md5($getuser['password'] . $vblicensenumber), 1);
        }
      }
    }
    else
    {
      $loginerrors[] = $sdlanguage['wrong_username'];
    }
  }
  else
  {
    $loginerrors[] = $sdlanguage['please_enter_username'];
  }
}


// ################################## LOGOUT ###################################

if(isset($_GET['logout']))
{
  // clear all cookies beginning with COOKIE_PREFIX
  $prefix_length = strlen($cookieprefix);
  foreach($_COOKIE AS $key => $val)
  {
    $index = @strpos($key, $cookieprefix);

    if($index == 0 AND $index !== false)
    {
      $key = substr($key, $prefix_length);

      if(trim($key) == '')
      {
        continue;
      }

      CreateCookie($key, '', 1);
    }
  }

  if($user['userid'] > 0)
  {
    // delete all sessions that match the userid
    $DB->query("DELETE FROM " . $tableprefix . "session WHERE userid = %d", $user['userid']);
  }

  // delete all sessions that match the sessionhash
  $DB->query("DELETE FROM " . $tableprefix . "session WHERE sessionhash = '%s'", $session['sessionhash']);

  $session['sessionhash'] = CreateSessionHash();

  $DB->query("INSERT INTO " . $tableprefix . "session (sessionhash, userid, host, idhash, lastactivity, styleid, useragent)
              VALUES ('%s', 0, '%s', '%s', %d, 0, '%s') ",
              $session['sessionhash'], $session['host'], $session['idhash'], TIMENOW, USER_AGENT);

  CreateCookie('sessionhash', $session['sessionhash'], 0);

  $user = array('userid'         => 0,
                'usergroupids'   => 1,  // vBulletin 3 - Unregistered / Not Logged In
                'username'       => '',
                'loggedin'       => 0,
                'email'          => '',
                'timezoneoffset' => 0,
                'dstonoff'       => 0,
                'dstauto'        => 1);
}


// ############################ ADD SESSION TO URL? ############################
// write the session id/hash if a LOGGED IN USER does not have cookies in the url,

if(sizeof($_COOKIE) > 0 OR preg_match("#(google|msnbot|yahoo! slurp)#si", $_SERVER['HTTP_USER_AGENT']) OR $user['userid'] == 0)
{
  $user['sessionurl'] = '';
}
else if (strlen($session['sessionhash']) > 0)
{
  $user['sessionurl'] = 's=' . $session['sessionhash'];
}


// ############################ DELETE OLD SESSIONS ############################

$DB->query("DELETE FROM " . $tableprefix . "session WHERE lastactivity < %d", intval(TIMENOW - $cookietimeout));


// ###################### SUBDREAMER USER SETTINGS SETUP #######################

$usersettings = array('userid'         => $user['userid'],
                      'usergroupids'   => $user['usergroupids'],
                      'username'       => $user['username'],
                      'loggedin'       => $user['loggedin'],
                      'email'          => $user['email'],
                      'timezoneoffset' => $user['timezoneoffset'],
                      'dstonoff'       => $user['dstonoff'],
                      'dstauto'        => $user['dstauto'],
                      'sessionurl'     => $user['sessionurl']);


// ############################## FASHERMAN CODE ###############################
// this code is submitted by fred (fasherman) and will help with the development of vbulletin 3 plugins

if($usersettings['userid'] != 0)
{
  $vb3userinfo = $DB->query_first("SELECT * FROM " . $tableprefix . "user WHERE userid = %d", $usersettings['userid']);

  if(isset($_COOKIE['bbstyleid']))
  {
    $vb3userinfo['styleid'] = $_COOKIE['bbstyleid'];
  }

  $vb3userinfo['logouthash'] = md5($vb3userinfo['userid'] . $vb3userinfo['salt'] . $vblicensenumber);

  if($vb3userinfo['styleid'] == 0 )
  {
    $vb3foruminfo = $DB->query_first("SELECT * FROM " . $tableprefix . "setting WHERE varname = 'styleid'");
    $vb3userinfo['styleid'] = $vb3foruminfo['value'];
  }

  $vb3styleinfo = $DB->query_first("SELECT * FROM " . $tableprefix . "style WHERE styleid = %d", $vb3userinfo['styleid']);
}
else
{
  $vb3foruminfo = $DB->query_first("SELECT * FROM " . $tableprefix . "setting WHERE varname = 'styleid'");
  $vb3styleinfo = $DB->query_first("SELECT * FROM " . $tableprefix . "style WHERE styleid = %d", $vb3foruminfo['value']);
}

$vb3styleinfo['css'] = str_replace("url(images","url(".$sdurl.$usersystem['folderpath']."images", $vb3styleinfo['css']);
$vb3stylevar = unserialize($vb3styleinfo['stylevars']);

$getvb3settings = $DB->query("SELECT * FROM " . $tableprefix . "setting");
while($vb3setting = $DB->fetch_array($getvb3settings))
{
  $vb3settings[$vb3setting['varname']] = $vb3setting['value'];
}

$getvb3datastores = $DB->query("SELECT * FROM " . $tableprefix . "datastore");
while($vb3datastore = $DB->fetch_array($getvb3datastores))
{
  $vb3datastores[$vb3datastore['title']] = $vb3datastore['data'];
}

// ############################## UNSET VARIABLES ##############################

unset($user, $session, $sessionhash, $vblicensenumber);

// ############################## USER FUNCTIONS ##############################

function IsIPBanned($clientip)
{
  global $DB, $usersystem, $dbname;

  if($usersystem['dbname'] != $dbname)
  {
    // Subdreamer is being integrated with a Forum in a different database
    $DB->select_db($usersystem['dbname']);
    $getbanip = $DB->query_first("SELECT value FROM " . $usersystem['tblprefix'] . "setting WHERE varname = 'banip'");
    $DB->select_db($dbname);
  }
  else
  {
    $getbanip = $DB->query_first("SELECT value FROM " . $usersystem['tblprefix'] . "setting WHERE varname = 'banip'");
  }

  $banip = trim($getbanip[0]);

  /* This isn't the same code as VB because their code has a bug in it :) */
  $addresses = explode(' ', preg_replace("/[[:space:]]+/", " ", $banip) );
  $clientaddresses = explode('.', $clientip);

  foreach ($addresses AS $val)
  {
    if (strpos(' ' . $clientip, ' ' . trim($val)) !== false)
    {
      // Do we have a full match on last octet of ban IP
      $ban_ip_a = explode(".", trim($val));
      if ($ban_ip_a[count($ban_ip_a) - 1] == $clientaddresses[count($ban_ip_a) - 1])
      {
        return true;
      }
    }
  }
  return false;
}

// Returns the relevent forum link url
// linkType
// 1 - Register
// 2 - UserCP
// 3 - Recover Password
// 4 - UserCP (requires $userid)
// 5 - SendPM (requires $userid)
function ForumLink($linkType, $userid = -1)
{
  global $sdurl, $usersystem;

  switch($linkType)
  {
  case 1:
    $url = 'register.php';
	break;
  case 2:
    $url = 'usercp.php';
	break;
  case 3:
    $url = 'login.php?do=lostpw';
	break;
  case 4:
    $url = 'member.php?u=' . $userid;
	break;
  case 5:
    $url = 'private.php?do=newpm&amp;u=' . $userid;
	break;
  }

  return $sdurl . $usersystem['folderpath'] . $url;
}

function ForumAvatar($userid, $username)
{
  global $DB, $dbname, $usersystem, $sdurl;

  $avatar = '';

  // forum information
  $forumdbname = $usersystem['dbname'];
  $forumpath   = $usersystem['folderpath'];
  $tableprefix = $usersystem['tblprefix'];

  // switch to forum database
  if($dbname != $forumdbname)
  {
    $DB->select_db($forumdbname);
  }

  if($userid > 0)
  {
    $extrasql = 'WHERE user.userid = ' . $userid;
  }
  else
  {
    $extrasql = 'WHERE user.username = "' . addslashes($username) . '"';
  }

  $ver = $DB->query_first("SELECT value FROM " . $tableprefix . "setting WHERE varname = 'templateversion'");

  $version = explode('.', $ver[0]);

  if($version[0] == 3)
  {
    if($version[1] < 5)
    {
      $query = "SELECT user.avatarid, user.avatarrevision, avatarpath, NOT ISNULL(avatardata) AS hascustom, customavatar.dateline, user.userid
                    FROM " . $tableprefix . "user AS user
                    LEFT JOIN " . $tableprefix . "avatar AS avatar ON avatar.avatarid = user.avatarid
                    LEFT JOIN " . $tableprefix . "customavatar AS customavatar ON customavatar.userid = user.userid " . $extrasql;
    }
    else
    {
      $query = "SELECT user.avatarid, user.avatarrevision, avatarpath, NOT ISNULL(filedata) AS hascustom, customavatar.dateline, user.userid
                    FROM " . $tableprefix . "user AS user
                    LEFT JOIN " . $tableprefix . "avatar AS avatar ON avatar.avatarid = user.avatarid
                    LEFT JOIN " . $tableprefix . "customavatar AS customavatar ON customavatar.userid = user.userid " . $extrasql;
    }
  }
  else
  {
    echo 'This doesn\'t appear to be vBulletin 3. The version number is ' . $ver[0];
  }

  if ($avatarinfo = $DB->query_first($query))
  {
    if (!empty($avatarinfo['avatarpath']))
    {
      $avatar = '<img alt="avatar" src="' . $sdurl . $forumpath . $avatarinfo['avatarpath'] . '"/>';
    }
    else if ($avatarinfo['hascustom'])
    {
      $usefileavatar = $DB->query_first("SELECT value FROM " . $tableprefix . "setting WHERE varname='usefileavatar'");
      if(isset($usefileavatar[0]) && $usefileavatar[0])
      {
        $avatarurl = $DB->query_first("SELECT value FROM " . $tableprefix . "setting WHERE varname='avatarurl'");

        if(substr($avatarurl[0], 0, 1) == '/')
        {
          $avurl = $avatarurl[0];
        }
        else
        {
          $avurl = $sdurl . $forumpath . $avatarurl[0];
        }

        $avatar = '<img alt="avatar" src="' . $avurl . '/avatar' . $avatarinfo['userid'] . '_' . $avatarinfo['avatarrevision'] . '.gif" />';
      }
      else
      {
        $avatar = '<img alt="avatar" src="' . $sdurl . $forumpath . 'image.php?u=' . $avatarinfo['userid'] . '&amp;dateline=' . $avatarinfo['dateline'] . '"/>';
      }
    }
  }

  // switch back to subdreamer database
  if($dbname != $forumdbname)
  {
    $DB->select_db($dbname);
  }

  return $avatar;
}

?>