1
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<?php
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/*
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* Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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* Version 1.0 (Banshee)
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* Copyright (C) 2006-2007 Dan Fuhry
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*
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* This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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*/
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function db_error_handler($errno, $errstr, $errfile = false, $errline = false, $errcontext = Array() )
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{
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if ( !defined('ENANO_DEBUG') )
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return;
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$e = error_reporting(0);
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error_reporting($e);
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if ( $e < $errno )
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return;
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$errtype = 'Notice';
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switch ( $errno )
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{
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case E_ERROR: case E_USER_ERROR: case E_CORE_ERROR: case E_COMPILE_ERROR: $errtype = 'Error'; break;
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case E_WARNING: case E_USER_WARNING: case E_CORE_WARNING: case E_COMPILE_WARNING: $errtype = 'Warning'; break;
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}
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$debug = debug_backtrace();
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$debug = $debug[2]['file'] . ', line ' . $debug[2]['line'];
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echo "<b>$errtype:</b> $errstr<br />Error source:<pre>$debug</pre>";
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}
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class mysql {
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var $num_queries, $query_backtrace, $latest_result, $latest_query, $_conn, $sql_stack_fields, $sql_stack_values;
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var $row = array();
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var $rowset = array();
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var $errhandler;
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function enable_errorhandler()
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{
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if ( function_exists('debug_backtrace') )
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{
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$this->errhandler = set_error_handler('db_error_handler');
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}
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}
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function disable_errorhandler()
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{
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if ( $this->errhandler )
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{
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set_error_handler($this->errhandler);
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}
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else
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{
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restore_error_handler();
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}
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}
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function sql_backtrace() {
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$qb = explode("\n", $this->query_backtrace);
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$bt = '';
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//for($i=sizeof($qb)-1;$i>=0;$i--) {
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for($i=0;$i<sizeof($qb);$i++) {
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$bt .= $qb[$i]."\n";
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}
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return $bt;
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}
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function ensure_connection()
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{
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if(!$this->_conn)
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{
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$this->connect();
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}
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}
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function _die($t = '') {
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if(defined('ENANO_HEADERS_SENT')) {
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ob_clean();
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}
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header('HTTP/1.1 500 Internal Server Error');
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$bt = $this->sql_backtrace();
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$e = htmlspecialchars(mysql_error());
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if($e=='') $e='<none>';
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if(defined('ENANO_CONFIG_FETCHED')) die_semicritical('Database error', '<h3>An error occurred during a database query.</h3><p>'.$t.'<br />Error returned by MySQL: '.$e.'<br />SQL Backtrace:</p><pre>'.$bt.'</pre>');
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else grinding_halt('Database error', '<h3>An error occurred during a database query.</h3><p>'.$t.'<br />Error returned by MySQL: '.$e.'<br />SQL Backtrace:</p><pre>'.$bt.'</pre>');
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exit;
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}
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function die_json()
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{
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$e = addslashes(htmlspecialchars(mysql_error()));
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$q = addslashes($this->latest_query);
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$t = "{'mode':'error','error':'An error occurred during database query.\nQuery was:\n $q\n\nError returned by MySQL: $e'}";
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die($t);
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}
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function get_error($t = '') {
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header('HTTP/1.1 500 Internal Server Error');
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$bt = $this->sql_backtrace();
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$e = htmlspecialchars(mysql_error());
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if($e=='') $e='<none>';
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$text = '<h3>An error occurred during a database query.</h3><p>'.$t.'<br />Error returned by MySQL: '.$e.'<br />SQL Backtrace:</p><pre>'.$bt.'</pre>';
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return $text;
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}
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function connect() {
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$this->enable_errorhandler();
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dc_here('dbal: trying to connect....');
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@include(ENANO_ROOT.'/config.php');
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if(isset($crypto_key))
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unset($crypto_key); // Get this sucker out of memory fast
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if(!defined('ENANO_INSTALLED') && !defined('MIDGET_INSTALLED') && !defined('IN_ENANO_INSTALL') )
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{
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dc_here('dbal: oops, looks like Enano isn\'t set up. Constants ENANO_INSTALLED, MIDGET_INSTALLED, and IN_ENANO_INSTALL are all undefined.');
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header('Location: install.php');
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exit;
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}
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$this->_conn = @mysql_connect($dbhost, $dbuser, $dbpasswd);
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unset($dbuser);
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unset($dbpasswd); // Security
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if(!$this->_conn) { dc_here('dbal: uhoh!<br />'.mysql_error()); grinding_halt('Enano is having a problem', '<p>Error: couldn\'t connect to MySQL.<br />'.mysql_error().'</p>'); }
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$this->query_backtrace = '';
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$this->num_queries = 0;
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dc_here('dbal: we\'re in, selecting database...');
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$q = $this->sql_query('USE '.$dbname.';');
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if(!$q) $this->_die('The database could not be selected.');
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dc_here('dbal: connected to MySQL');
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$this->disable_errorhandler();
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}
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function sql_query($q) {
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$this->enable_errorhandler();
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$this->num_queries++;
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$this->query_backtrace .= $q."\n";
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$this->latest_query = $q;
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dc_here('dbal: making SQL query:<br /><tt>'.$q.'</tt>');
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if(!$this->_conn) $this->_die('A database connection has not yet been established.');
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if(!$this->check_query($q))
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{
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$this->report_query($q);
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grinding_halt('SQL Injection attempt', '<p>Enano has caught and prevented an SQL injection attempt. Your IP address has been recorded and the administrator has been notified.</p><p>Query was:</p><pre>'.htmlspecialchars($q).'</pre>');
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}
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$r = mysql_query($q, $this->_conn);
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$this->latest_result = $r;
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$this->disable_errorhandler();
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return $r;
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}
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function sql_unbuffered_query($q) {
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$this->enable_errorhandler();
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$this->num_queries++;
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$this->query_backtrace .= '(UNBUFFERED) ' . $q."\n";
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$this->latest_query = $q;
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dc_here('dbal: making SQL query:<br /><tt>'.$q.'</tt>');
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if(!$this->_conn) $this->_die('A database connection has not yet been established.');
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if(!$this->check_query($q))
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{
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$this->report_query($q);
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grinding_halt('SQL Injection attempt', '<p>Enano has caught and prevented an SQL injection attempt. Your IP address has been recorded and the administrator has been notified.</p><p>Query was:</p><pre>'.htmlspecialchars($q).'</pre>');
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}
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$r = mysql_unbuffered_query($q, $this->_conn);
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$this->latest_result = $r;
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$this->disable_errorhandler();
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return $r;
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}
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/**
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* Checks a SQL query for possible signs of injection attempts
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* @param string $q the query to check
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* @return bool true if query passed check, otherwise false
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*/
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function check_query($q, $debug = false)
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{
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if($debug) echo "\$db->check_query(): checking query: ".htmlspecialchars($q).'<br />'."\n";
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$sz = strlen($q);
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$quotechar = false;
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$quotepos = 0;
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$prev_is_quote = false;
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$just_started = false;
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for($i=0;$i<strlen($q);$i++,$c=substr($q, $i, 1))
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{
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$next = substr($q, $i+1, 1);
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$next2 = substr($q, $i+2, 1);
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$prev = substr($q, $i-1, 1);
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$prev2 = substr($q, $i-2, 1);
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if(isset($c) && in_array($c, Array('"', "'", '`')))
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{
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if($quotechar)
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{
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if(
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( $quotechar == $c && $quotechar != $next && ( $quotechar != $prev || $just_entered ) && $prev != '\\') ||
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( $prev2 == '\\' && $prev == $quotechar && $quotechar == $c )
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)
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{
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$quotechar = false;
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if($debug) echo('$db->check_query(): just finishing a quote section, quoted string: '.htmlspecialchars(substr($q, $quotepos, $i - $quotepos + 1)) . '<br />');
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$q = substr($q, 0, $quotepos) . 'SAFE_QUOTE' . substr($q, $i + 1, strlen($q));
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if($debug) echo('$db->check_query(): Filtered query: '.$q.'<br />');
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$i = $quotepos;
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}
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}
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else
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{
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$quotechar = $c;
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$quotepos = $i;
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$just_entered = true;
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}
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if($debug) echo '$db->check_query(): found quote char as pos: '.$i.'<br />';
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continue;
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}
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$just_entered = false;
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}
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if(substr(trim($q), strlen(trim($q))-1, 1) == ';') $q = substr(trim($q), 0, strlen(trim($q))-1);
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for($i=0;$i<strlen($q);$i++,$c=substr($q, $i, 1))
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{
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if( ( $c == ';' && $i != $sz-1 ) || $c . substr($q, $i+1, 1) == '--') // Don't permit semicolons in mid-query, and never allow comments
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{
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// Injection attempt!
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if($debug)
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{
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$e = '';
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for($j=$i-5;$j<$i+5;$j++)
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{
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if($j == $i) $e .= '<span style="color: red; text-decoration: underline;">' . $c . '</span>';
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else $e .= $c;
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}
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echo 'Injection attempt caught at pos: '.$i.'<br />';
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}
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return false;
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}
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}
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return true;
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}
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/**
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* Set the internal result pointer to X
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* @param int $pos The number of the row
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* @param resource $result The MySQL result resource - if not given, the latest cached query is assumed
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* @return true on success, false on failure
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*/
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function sql_data_seek($pos, $result = false)
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{
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$this->enable_errorhandler();
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if(!$result)
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$result = $this->latest_result;
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if(!$result)
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{
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$this->disable_errorhandler();
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return false;
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}
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if(mysql_data_seek($result, $pos))
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{
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$this->disable_errorhandler();
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return true;
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}
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else
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{
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$this->disable_errorhandler();
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return false;
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}
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}
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/**
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* Reports a bad query to the admin
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* @param string $query the naughty query
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* @access private
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*/
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function report_query($query)
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{
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global $session;
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if(is_object($session) && defined('ENANO_MAINSTREAM'))
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$username = $session->username;
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else
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$username = 'Unavailable';
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$query = $this->escape($query);
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$q = $this->sql_query('INSERT INTO '.table_prefix.'logs(log_type, action, time_id, date_string, page_text, author, edit_summary)
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VALUES(\'security\', \'sql_inject\', '.time().', \'\', \''.$query.'\', \''.$username.'\', \''.$_SERVER['REMOTE_ADDR'].'\');');
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}
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function fetchrow($r = false) {
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$this->enable_errorhandler();
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if(!$this->_conn) return false;
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if(!$r) $r = $this->latest_result;
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if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
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$row = mysql_fetch_assoc($r);
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$this->disable_errorhandler();
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return $row;
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}
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+ − 295
function fetchrow_num($r = false) {
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$this->enable_errorhandler();
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if(!$r) $r = $this->latest_result;
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if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
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$row = mysql_fetch_row($r);
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$this->disable_errorhandler();
+ − 301
return $row;
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}
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function numrows($r = false) {
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$this->enable_errorhandler();
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if(!$r) $r = $this->latest_result;
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if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
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$n = mysql_num_rows($r);
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$this->disable_errorhandler();
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return $n;
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}
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function escape($str)
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{
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$this->enable_errorhandler();
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$str = mysql_real_escape_string($str);
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$this->disable_errorhandler();
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return $str;
+ − 319
}
+ − 320
+ − 321
function free_result($result = false)
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{
+ − 323
$this->enable_errorhandler();
+ − 324
if(!$result)
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$result = $this->latest_result;
+ − 326
if(!$result)
+ − 327
{
+ − 328
$this->disable_errorhandler();
+ − 329
return null;
+ − 330
}
+ − 331
mysql_free_result($result);
+ − 332
$this->disable_errorhandler();
+ − 333
return null;
+ − 334
}
+ − 335
+ − 336
function close() {
+ − 337
dc_here('dbal: closing MySQL connection');
+ − 338
mysql_close($this->_conn);
+ − 339
unset($this->_conn);
+ − 340
}
+ − 341
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// phpBB DBAL compatibility
+ − 343
function sql_fetchrow($r = false)
+ − 344
{
+ − 345
return $this->fetchrow($r);
+ − 346
}
+ − 347
function sql_freeresult($r = false)
+ − 348
{
+ − 349
if(!$this->_conn) return false;
+ − 350
if(!$r) $r = $this->latest_result;
+ − 351
if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
+ − 352
mysql_free_result($r);
+ − 353
}
+ − 354
function sql_numrows($r = false)
+ − 355
{
+ − 356
if(!$this->_conn) return false;
+ − 357
if(!$r) $r = $this->latest_result;
+ − 358
if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
+ − 359
return mysql_num_rows($r);
+ − 360
}
+ − 361
function sql_affectedrows($r = false, $f, $n)
+ − 362
{
+ − 363
if(!$this->_conn) return false;
+ − 364
if(!$r) $r = $this->latest_result;
+ − 365
if(!$r) $this->_die('$db->fetchrow(): an invalid MySQL resource was passed.');
+ − 366
return mysql_affected_rows();
+ − 367
}
+ − 368
+ − 369
function sql_type_cast(&$value)
+ − 370
{
+ − 371
if ( is_float($value) )
+ − 372
{
+ − 373
return doubleval($value);
+ − 374
}
+ − 375
if ( is_integer($value) || is_bool($value) )
+ − 376
{
+ − 377
return intval($value);
+ − 378
}
+ − 379
if ( is_string($value) || empty($value) )
+ − 380
{
+ − 381
return '\'' . $this->sql_escape_string($value) . '\'';
+ − 382
}
+ − 383
// uncastable var : let's do a basic protection on it to prevent sql injection attempt
+ − 384
return '\'' . $this->sql_escape_string(htmlspecialchars($value)) . '\'';
+ − 385
}
+ − 386
+ − 387
function sql_statement(&$fields, $fields_inc='')
+ − 388
{
+ − 389
// init result
+ − 390
$this->sql_fields = $this->sql_values = $this->sql_update = '';
+ − 391
if ( empty($fields) && empty($fields_inc) )
+ − 392
{
+ − 393
return;
+ − 394
}
+ − 395
+ − 396
// process
+ − 397
if ( !empty($fields) )
+ − 398
{
+ − 399
$first = true;
+ − 400
foreach ( $fields as $field => $value )
+ − 401
{
+ − 402
// field must contain a field name
+ − 403
if ( !empty($field) && is_string($field) )
+ − 404
{
+ − 405
$value = $this->sql_type_cast($value);
+ − 406
$this->sql_fields .= ( $first ? '' : ', ' ) . $field;
+ − 407
$this->sql_values .= ( $first ? '' : ', ' ) . $value;
+ − 408
$this->sql_update .= ( $first ? '' : ', ' ) . $field . ' = ' . $value;
+ − 409
$first = false;
+ − 410
}
+ − 411
}
+ − 412
}
+ − 413
if ( !empty($fields_inc) )
+ − 414
{
+ − 415
foreach ( $fields_inc as $field => $indent )
+ − 416
{
+ − 417
if ( $indent != 0 )
+ − 418
{
+ − 419
$this->sql_update .= (empty($this->sql_update) ? '' : ', ') . $field . ' = ' . $field . ($indent < 0 ? ' - ' : ' + ') . abs($indent);
+ − 420
}
+ − 421
}
+ − 422
}
+ − 423
}
+ − 424
+ − 425
function sql_stack_reset($id='')
+ − 426
{
+ − 427
if ( empty($id) )
+ − 428
{
+ − 429
$this->sql_stack_fields = array();
+ − 430
$this->sql_stack_values = array();
+ − 431
}
+ − 432
else
+ − 433
{
+ − 434
$this->sql_stack_fields[$id] = array();
+ − 435
$this->sql_stack_values[$id] = array();
+ − 436
}
+ − 437
}
+ − 438
+ − 439
function sql_stack_statement(&$fields, $id='')
+ − 440
{
+ − 441
$this->sql_statement($fields);
+ − 442
if ( empty($id) )
+ − 443
{
+ − 444
$this->sql_stack_fields = $this->sql_fields;
+ − 445
$this->sql_stack_values[] = '(' . $this->sql_values . ')';
+ − 446
}
+ − 447
else
+ − 448
{
+ − 449
$this->sql_stack_fields[$id] = $this->sql_fields;
+ − 450
$this->sql_stack_values[$id][] = '(' . $this->sql_values . ')';
+ − 451
}
+ − 452
}
+ − 453
+ − 454
function sql_stack_insert($table, $transaction=false, $line='', $file='', $break_on_error=true, $id='')
+ − 455
{
+ − 456
if ( (empty($id) && empty($this->sql_stack_values)) || (!empty($id) && empty($this->sql_stack_values[$id])) )
+ − 457
{
+ − 458
return false;
+ − 459
}
+ − 460
switch( SQL_LAYER )
+ − 461
{
+ − 462
case 'mysql':
+ − 463
case 'mysql4':
+ − 464
if ( empty($id) )
+ − 465
{
+ − 466
$sql = 'INSERT INTO ' . $table . '
+ − 467
(' . $this->sql_stack_fields . ') VALUES ' . implode(",\n", $this->sql_stack_values);
+ − 468
}
+ − 469
else
+ − 470
{
+ − 471
$sql = 'INSERT INTO ' . $table . '
+ − 472
(' . $this->sql_stack_fields[$id] . ') VALUES ' . implode(",\n", $this->sql_stack_values[$id]);
+ − 473
}
+ − 474
$this->sql_stack_reset($id);
+ − 475
return $this->sql_query($sql, $transaction, $line, $file, $break_on_error);
+ − 476
break;
+ − 477
default:
+ − 478
$count_sql_stack_values = empty($id) ? count($this->sql_stack_values) : count($this->sql_stack_values[$id]);
+ − 479
$result = !empty($count_sql_stack_values);
+ − 480
for ( $i = 0; $i < $count_sql_stack_values; $i++ )
+ − 481
{
+ − 482
if ( empty($id) )
+ − 483
{
+ − 484
$sql = 'INSERT INTO ' . $table . '
+ − 485
(' . $this->sql_stack_fields . ') VALUES ' . $this->sql_stack_values[$i];
+ − 486
}
+ − 487
else
+ − 488
{
+ − 489
$sql = 'INSERT INTO ' . $table . '
+ − 490
(' . $this->sql_stack_fields[$id] . ') VALUES ' . $this->sql_stack_values[$id][$i];
+ − 491
}
+ − 492
$result &= $this->sql_query($sql, $transaction, $line, $file, $break_on_error);
+ − 493
}
+ − 494
$this->sql_stack_reset($id);
+ − 495
return $result;
+ − 496
break;
+ − 497
}
+ − 498
}
+ − 499
+ − 500
function sql_subquery($field, $sql, $line='', $file='', $break_on_error=true, $type=TYPE_INT)
+ − 501
{
+ − 502
// sub-queries doable
+ − 503
$this->sql_get_version();
+ − 504
if ( !in_array(SQL_LAYER, array('mysql', 'mysql4')) || (($this->sql_version[0] + ($this->sql_version[1] / 100)) >= 4.01) )
+ − 505
{
+ − 506
return $sql;
+ − 507
}
+ − 508
+ − 509
// no sub-queries
+ − 510
$ids = array();
+ − 511
$result = $this->sql_query(trim($sql), false, $line, $file, $break_on_error);
+ − 512
while ( $row = $this->sql_fetchrow($result) )
+ − 513
{
+ − 514
$ids[] = $type == TYPE_INT ? intval($row[$field]) : '\'' . $this->sql_escape_string($row[$field]) . '\'';
+ − 515
}
+ − 516
$this->sql_freeresult($result);
+ − 517
return empty($ids) ? 'NULL' : implode(', ', $ids);
+ − 518
}
+ − 519
+ − 520
function sql_col_id($expr, $alias)
+ − 521
{
+ − 522
$this->sql_get_version();
+ − 523
return in_array(SQL_LAYER, array('mysql', 'mysql4')) && (($this->sql_version[0] + ($this->sql_version[1] / 100)) <= 4.01) ? $alias : $expr;
+ − 524
}
+ − 525
+ − 526
function sql_get_version()
+ − 527
{
+ − 528
if ( empty($this->sql_version) )
+ − 529
{
+ − 530
$this->sql_version = array(0, 0, 0);
+ − 531
switch ( SQL_LAYER )
+ − 532
{
+ − 533
case 'mysql':
+ − 534
case 'mysql4':
+ − 535
if ( function_exists('mysql_get_server_info') )
+ − 536
{
+ − 537
$lo_version = explode('-', mysql_get_server_info());
+ − 538
$this->sql_version = explode('.', $lo_version[0]);
+ − 539
$this->sql_version = array(intval($this->sql_version[0]), intval($this->sql_version[1]), intval($this->sql_version[2]), $lo_version[1]);
+ − 540
}
+ − 541
break;
+ − 542
+ − 543
case 'postgresql':
+ − 544
case 'mssql':
+ − 545
case 'mssql-odbc':
+ − 546
default:
+ − 547
break;
+ − 548
}
+ − 549
}
+ − 550
return $this->sql_version;
+ − 551
}
+ − 552
+ − 553
function sql_error()
+ − 554
{
+ − 555
if ( $this->_conn )
+ − 556
{
+ − 557
return mysql_error();
+ − 558
}
+ − 559
else
+ − 560
{
+ − 561
return array();
+ − 562
}
+ − 563
}
+ − 564
function sql_escape_string($t)
+ − 565
{
+ − 566
return mysql_real_escape_string($t);
+ − 567
}
+ − 568
function sql_close()
+ − 569
{
+ − 570
$this->close();
+ − 571
}
+ − 572
function sql_fetchrowset($query_id = 0)
+ − 573
{
+ − 574
if( !$query_id )
+ − 575
{
+ − 576
$query_id = $this->query_result;
+ − 577
}
+ − 578
+ − 579
if( $query_id )
+ − 580
{
+ − 581
unset($this->rowset[$query_id]);
+ − 582
unset($this->row[$query_id]);
+ − 583
+ − 584
while($this->rowset[$query_id] = mysql_fetch_array($query_id, MYSQL_ASSOC))
+ − 585
{
+ − 586
$result[] = $this->rowset[$query_id];
+ − 587
}
+ − 588
+ − 589
return $result;
+ − 590
}
+ − 591
else
+ − 592
{
+ − 593
return false;
+ − 594
}
+ − 595
}
+ − 596
}
+ − 597
+ − 598
?>