Discuz7 php源码,该如何解决

<?php
/*
[Discuz!] (C)2001-2009 Comsenz Inc.
This is NOT a freeware, use is subject to license terms
$Id: common.inc.php 17460 2008-12-24 01:46:38Z monkey $
*/
//关闭magic_quotes_gpc  引用 ,设置关闭PHP错误报告
error_reporting(0);
set_magic_quotes_runtime(0);
//获取脚本开始的时间,最后有脚本结束时间减去这个就会得到整个脚本运行的时间
$mtime = explode(' ', microtime());
$discuz_starttime = $mtime[1] + $mtime[0];

//设置一些常量
//SYSY_DEBUG是当前是否是调试状态
//IN_DISCUZ是在一些不允许直接浏览的页面用的,如果直接浏览这些页面,就会退出并出现Access Denied
//DISCUZ_ROOT是获取当前的论坛的主目录的绝对路径
//MAGIC_QUOTES_GPC 是 当前的magic_quotes_gpc的状态
//CURSCRIPT是当前运行的脚本的名称吧...现在设置为空...在其他脚本中会有值....
define('SYS_DEBUG', FALSE);
define('IN_DISCUZ', TRUE);
define('DISCUZ_ROOT', substr(dirname(__FILE__), 0, -7));
define('MAGIC_QUOTES_GPC', get_magic_quotes_gpc());
!defined('CURSCRIPT') && define('CURSCRIPT', '');
//为了兼容性
if(PHP_VERSION < '4.1.0') {
$_GET = &$HTTP_GET_VARS;
$_POST = &$HTTP_POST_VARS;
$_COOKIE = &$HTTP_COOKIE_VARS;
$_SERVER = &$HTTP_SERVER_VARS;
$_ENV = &$HTTP_ENV_VARS;
$_FILES = &$HTTP_POST_FILES;
}
//为了安全性...因为脚本运行到这里之前这两个global数组是不会被定义的...
if (isset($_REQUEST['GLOBALS']) OR isset($_FILES['GLOBALS'])) {
exit('Request tainting attempted.');
}
//包含论坛的函数库...这个函数库里面有几乎整个论坛需要用到的函数
require_once DISCUZ_ROOT.'./include/global.func.php';
//测试下浏览者是什么玩意...是不是ROBOT是的话就退出显示403....
getrobot();
if(defined('NOROBOT') && IS_ROBOT) {
exit(header("HTTP/1.1 403 Forbidden"));
}
//获取$_COOKIE  等等的值然后 设置里面的key为一个变量,值为其对应的值并添加引用....
//比如说有$_COOKIE['discuz_auth']  = '123456' 就设置$discuz_auth = '123456'
//以此类推
foreach(array('_COOKIE', '_POST', '_GET') as $_request) {
foreach($$_request as $_key => $_value) {
  $_key{0} != '_' && $$_key = daddslashes($_value);
}
}
//过滤$_FILES,也就是添加引用
if (!MAGIC_QUOTES_GPC && $_FILES) {
$_FILES = daddslashes($_FILES);
}
//初始化一些变量
$charset = $dbs = $dbcharset = $forumfounders = $metakeywords = $extrahead = $seodescription = $mnid = '';
$plugins = $hooks = $admincp = $jsmenu = $forum = $thread = $language = $actioncode = $modactioncode = $lang = array();
$_DCOOKIE = $_DSESSION = $_DCACHE = $_DPLUGIN = $advlist = array();

//包含论坛的配置文件
require_once DISCUZ_ROOT.'./config.inc.php';
//$urlxssdefend是论坛访问页面防御开关，可避免用户通过非法的url地址对本站用户造成危害
if($urlxssdefend && !empty($_SERVER['REQUEST_URI'])) {
$temp = urldecode($_SERVER['REQUEST_URI']);
if(strpos($temp, '<') !== false || strpos($temp, '"') !== false)
  exit('Request Bad url');
}
//$prelength为设置的cookie的前缀的长度
//循环检查$_COOKIE里面带设置的前缀的变量,如果带前缀就填入到$_DCOOKIE里面并且不带前缀
//最后 过滤值
$prelength = strlen($cookiepre);
foreach($_COOKIE as $key => $val) {
if(substr($key, 0, $prelength) == $cookiepre) {
  $_DCOOKIE[(substr($key, $prelength))] = MAGIC_QUOTES_GPC ? $val : daddslashes($val);
}
}
//销毁这些变量,都是对$_类数组操作用到的一些变量
unset($prelength, $_request, $_key, $_value);
//
$inajax = !empty($inajax);
$handlekey = !empty($handlekey) ? htmlspecialchars($handlekey) : '';
$timestamp = time();

//$attackevasive 论坛防御级别，可防止大量的非正常请求造成的拒绝服务攻击
if($attackevasive && CURSCRIPT != 'seccode') {
require_once DISCUZ_ROOT.'./include/security.inc.php';
}
//包含数据库类 的文件
require_once DISCUZ_ROOT.'./include/db_'.$database.'.class.php';

//$PHP_SELF为当前活动的脚本相对于网站主目录的路径
//$BASESCRIPT为当前活动的脚本文件名字带扩展名
//$BASEFILENAME为当前活动的脚本文件的名字不带扩展名
//$boardurl为当前活动脚本的全网站路径去掉后面文件名,如果有api|archiver|wap文件夹就去掉...
$PHP_SELF = dhtmlspecialchars($_SERVER['PHP_SELF'] ? $_SERVER['PHP_SELF'] : $_SERVER['SCRIPT_NAME']);
$BASESCRIPT = basename($PHP_SELF);
list($BASEFILENAME) = explode('.', $BASESCRIPT);
$boardurl = htmlspecialchars('http://'.$_SERVER['HTTP_HOST'].preg_replace("/\/+(api|archiver|wap)?\/*$/i", '', substr($PHP_SELF, 0, strrpos($PHP_SELF, '/'))).'/');
//获得当前浏览者IP
if(getenv('HTTP_CLIENT_IP') && strcasecmp(getenv('HTTP_CLIENT_IP'), 'unknown')) {
$onlineip = getenv('HTTP_CLIENT_IP');
} elseif(getenv('HTTP_X_FORWARDED_FOR') && strcasecmp(getenv('HTTP_X_FORWARDED_FOR'), 'unknown')) {
$onlineip = getenv('HTTP_X_FORWARDED_FOR');
} elseif(getenv('REMOTE_ADDR') && strcasecmp(getenv('REMOTE_ADDR'), 'unknown')) {
$onlineip = getenv('REMOTE_ADDR');
} elseif(isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], 'unknown')) {
$onlineip = $_SERVER['REMOTE_ADDR'];
}
preg_match("/[\d\.]{7,15}/", $onlineip, $onlineipmatches);
$onlineip = $onlineipmatches[0] ? $onlineipmatches[0] : 'unknown';
unset($onlineipmatches);

//include     settings的缓存 并且将里面的数组给extract了不懂的看这个函数解释...我不罗嗦了...
$cachelost = (@include DISCUZ_ROOT.'./forumdata/cache/cache_settings.php') ? '' : 'settings';
@extract($_DCACHE['settings']);

//如果开启了GZIP压缩并且服务器有这个功能
//并且当前脚本不是wap和attachment
//并且inajax为FLASE
//就ob_start('ob_gzhandler')否则就ob_start();
if($gzipcompress && function_exists('ob_gzhandler') && !in_array(CURSCRIPT, array('attachment', 'wap')) && !$inajax) {
ob_start('ob_gzhandler');
} else {
$gzipcompress = 0;
ob_start();
}
//平衡负载用的,$loadctrl我不知道在哪里..汗一个
if(!empty($loadctrl) && substr(PHP_OS, 0, 3) != 'WIN') {
if($fp = @fopen('/proc/loadavg', 'r')) {
  list($loadaverage) = explode(' ', fread($fp, 6));
  fclose($fp);
  if($loadaverage > $loadctrl) {
   header("HTTP/1.0 503 Service Unavailable");
   include DISCUZ_ROOT.'./include/serverbusy.htm';
   exit();
  }
}
}
//包含其他的缓存文件
if(in_array(CURSCRIPT, array('index', 'forumdisplay', 'viewthread', 'post', 'topicadmin', 'register', 'archiver'))) {
$cachelost .= (@include DISCUZ_ROOT.'./forumdata/cache/cache_'.CURSCRIPT.'.php') ? '' : ' '.CURSCRIPT;
}
//连接数据库,完毕之后设置这些值为NULL
$db = new dbstuff;
$db->connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect, true, $dbcharset);
$dbuser = $dbpw = $pconnect = $sdb = NULL;
//乱七八糟的 ,反正就是找到了需要的sid并过滤了就是了 $transsidstatus我也没找到在哪
//看看是不是后台设置了通过sid传输的那个东东，还有是不是通过wap访问的，
//还有是不是有sid这个东东在$_GET或$_POST这两个的任何一个中，
//以上结论都成立的话从GET中获得sid，不成立的话从$_DCOOKIE中获得。
$sid = daddslashes(($transsidstatus || CURSCRIPT == 'wap') && (isset($_GET['sid']) || isset($_POST['sid'])) ?
(isset($_GET['sid']) ? $_GET['sid'] : $_POST['sid']) :
(isset($_DCOOKIE['sid']) ? $_DCOOKIE['sid'] : ''));
//如果当前脚本是attachment         sid是通过GET方式获得就加密然后过滤它
CURSCRIPT == 'attachment' && isset($_GET['sid']) && $sid = addslashes(authcode($_GET['sid'], 'DECODE', $_DCACHE['settings']['authkey']));
//设置一个$discuz_auth_key，md5加密。。
$discuz_auth_key = md5($_DCACHE['settings']['authkey'].$_SERVER['HTTP_USER_AGENT']);
//获得$discuz_pw, $discuz_secques, $discuz_uid这三个变量，分别对应密码，提示问题和uid。
//强制过滤了这3个值
list($discuz_pw, $discuz_secques, $discuz_uid) = empty($_DCOOKIE['auth']) ? array('', '', 0) : daddslashes(explode("\t", authcode($_DCOOKIE['auth'], 'DECODE')), 1);

//第一行是初始化变量用的（无论何时用变量都要考虑初始化，要不然安全性不值得一提）
//接下来是判断是不是有sid,有的话就从cdb_session表中取来，然后连接一下cdb_members表取出东西
//在$membertablefields这个变量里面已经全面写出来了
//标记了一个sessionexist变量，表示这个会员是在线的。
$prompt = $sessionexists = $seccode = 0;
$membertablefields = 'm.uid AS discuz_uid, m.username AS discuz_user, m.password AS discuz_pw, m.secques AS discuz_secques,
m.adminid, m.groupid, m.groupexpiry, m.extgroupids, m.email, m.timeoffset, m.tpp, m.ppp, m.posts, m.digestposts,
m.oltime, m.pageviews, m.credits, m.extcredits1, m.extcredits2, m.extcredits3, m.extcredits4, m.extcredits5,
m.extcredits6, m.extcredits7, m.extcredits8, m.timeformat, m.dateformat, m.pmsound, m.sigstatus, m.invisible,
m.lastvisit, m.lastactivity, m.lastpost, m.prompt, m.accessmasks, m.editormode, m.customshow, m.customaddfeed';
if($sid) {
if($discuz_uid) {
  $query = $db->query("SELECT s.sid, s.styleid, s.groupid='6' AS ipbanned, s.pageviews AS spageviews, s.lastolupdate, s.seccode, $membertablefields
   FROM {$tablepre}sessions s, {$tablepre}members m
   WHERE m.uid=s.uid AND s.sid='$sid' AND CONCAT_WS('.',s.ip1,s.ip2,s.ip3,s.ip4)='$onlineip' AND m.uid='$discuz_uid'
   AND m.password='$discuz_pw' AND m.secques='$discuz_secques'");
} else {
  $query = $db->query("SELECT sid, uid AS sessionuid, groupid, groupid='6' AS ipbanned, pageviews AS spageviews, styleid, lastolupdate, seccode
   FROM {$tablepre}sessions WHERE sid='$sid' AND CONCAT_WS('.',ip1,ip2,ip3,ip4)='$onlineip'");
}
if($_DSESSION = $db->fetch_array($query)) {
  $sessionexists = 1;
  if(!empty($_DSESSION['sessionuid'])) {
   $_DSESSION = array_merge($_DSESSION, $db->fetch_first("SELECT $membertablefields
    FROM {$tablepre}members m WHERE uid='$_DSESSION[sessionuid]'"));
  }
} else {
  if($_DSESSION = $db->fetch_first("SELECT sid, groupid, groupid='6' AS ipbanned, pageviews AS spageviews, styleid, lastolupdate, seccode
   FROM {$tablepre}sessions WHERE sid='$sid' AND CONCAT_WS('.',ip1,ip2,ip3,ip4)='$onlineip'")) {
   clearcookies();
   $sessionexists = 1;
  }
}
}
//如果不在线执行
//如果COOKIE不正确就清除
//如果IP是被办的  就被办的(标记了一下)
//写入一个随机值写入到SID  SECCODE
if(!$sessionexists) {
if($discuz_uid) {
  if(!($_DSESSION = $db->fetch_first("SELECT $membertablefields, m.styleid
   FROM {$tablepre}members m WHERE m.uid='$discuz_uid' AND m.password='$discuz_pw' AND m.secques='$discuz_secques'"))) {
   clearcookies();
  }
}