Fixed a number of bug reports related to table/db names not being escaped or prefixed correctly.

1 files changed, 27 insertions, 89 deletions

diff --git a/system/database/drivers/mysqli/mysqli_driver.php b/system/database/drivers/mysqli/mysqli_driver.php
index a5d104cc2..f7c986fc8 100644
--- a/system/database/drivers/mysqli/mysqli_driver.php
+++ b/system/database/drivers/mysqli/mysqli_driver.php
@@ -31,6 +31,9 @@
 class CI_DB_mysqli_driver extends CI_DB {

 

 	var $dbdriver = 'mysqli';

+	

+	// The character used for escaping

+	var $_escape_char = '`';

 

 	/**

 	 * The syntax to count rows is slightly different across different

@@ -91,12 +94,12 @@ class CI_DB_mysqli_driver extends CI_DB {
 	/**

 	 * Set client character set

 	 *

-	 * @access	public

+	 * @access	private

 	 * @param	string

 	 * @param	string

 	 * @return	resource

 	 */

-	function db_set_charset($charset, $collation)

+	function _db_set_charset($charset, $collation)

 	{

 		return @mysqli_query($this->conn_id, "SET NAMES '".$this->escape_str($charset)."' COLLATE '".$this->escape_str($collation)."'");

 	}

@@ -306,8 +309,8 @@ class CI_DB_mysqli_driver extends CI_DB {
 	{

 		if ($table == '')

 			return '0';

-	

-		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($this->dbprefix.$table));

+		

+		$query = $this->query($this->_count_string . $this->_protect_identifiers('numrows'). " FROM " . $this->_protect_identifiers($table, TRUE, NULL, FALSE));

 		

 		if ($query->num_rows() == 0)

 			return '0';

@@ -329,7 +332,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */

 	function _list_tables($prefix_limit = FALSE)

 	{

-		$sql = "SHOW TABLES FROM `".$this->database."`";	

+		$sql = "SHOW TABLES FROM ".$this->_escape_char.$this->database.$this->_escape_char;	

 		

 		if ($prefix_limit !== FALSE AND $this->dbprefix != '')

 		{

@@ -352,7 +355,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */

 	function _list_columns($table = '')

 	{

-		return "SHOW COLUMNS FROM ".$this->_escape_table($table);

+		return "SHOW COLUMNS FROM ".$table;

 	}

 

 	// --------------------------------------------------------------------

@@ -368,7 +371,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */

 	function _field_data($table)

 	{

-		return "SELECT * FROM ".$this->_escape_table($table)." LIMIT 1";

+		return "SELECT * FROM ".$table." LIMIT 1";

 	}

 

 	// --------------------------------------------------------------------

@@ -400,99 +403,32 @@ class CI_DB_mysqli_driver extends CI_DB {
 	// --------------------------------------------------------------------

 

 	/**

-	 * Escape Column Name

-	 *

-	 * This function adds backticks around supplied column name

-	 *

-	 * @access	private

-	 * @param	string	the column name

-	 * @return	string

-	 */

-	function _escape_column($column)

-	{

-		return '`' .$column. '`';

-	}

-	

-	// --------------------------------------------------------------------

-

-	/**

-	 * Escape Table Name

+	 * Escape the SQL Identifiers

 	 *

-	 * This function adds backticks if the table name has a period

-	 * in it. Some DBs will get cranky unless periods are escaped

+	 * This function escapes column and table names

 	 *

 	 * @access	private

-	 * @param	string	the table name

+	 * @param	string

 	 * @return	string

 	 */

-	function _escape_table($table)

+	function _escape_identifiers($item)

 	{

-		if (strpos($table, '.') !== FALSE)

+		if ($this->_escape_char == '')

 		{

-			$table = '`' . str_replace('.', '`.`', $table) . '`';

+			return $item;

 		}

-		

-		return $table;

-	}

-		

-	// --------------------------------------------------------------------

-

-	/**

-	 * Protect Identifiers

-	 *

-	 * This function adds backticks if appropriate based on db type

-	 *

-	 * @access	private

-	 * @param	mixed	the item to escape

-	 * @param	boolean	only affect the first word

-	 * @return	mixed	the item with backticks

-	 */

-	function _protect_identifiers($item, $first_word_only = FALSE)

-	{

-		if (is_array($item))

-		{

-			$escaped_array = array();

-

-			foreach($item as $k=>$v)

-			{

-				$escaped_array[$this->_protect_identifiers($k)] = $this->_protect_identifiers($v, $first_word_only);

-			}

-

-			return $escaped_array;

-		}	

-

-		// This function may get "item1 item2" as a string, and so

-		// we may need "`item1` `item2`" and not "`item1 item2`"

-		if (ctype_alnum($item) === FALSE)

+	

+		if (strpos($item, '.') !== FALSE)

 		{

-			if (strpos($item, '.') !== FALSE)

-			{

-				$aliased_tables = implode(".",$this->ar_aliased_tables).'.';

-				$table_name =  substr($item, 0, strpos($item, '.')+1);

-				$item = (strpos($aliased_tables, $table_name) !== FALSE) ? $item = $item : $this->dbprefix.$item;

-			}

-

-			// This function may get "field >= 1", and need it to return "`field` >= 1"

-			$lbound = ($first_word_only === TRUE) ? '' : '|\s|\(';

-

-			$item = preg_replace('/(^'.$lbound.')([\w\d\-\_]+?)(\s|\)|$)/iS', '$1`$2`$3', $item);

+			$str = $this->_escape_char.str_replace('.', $this->_escape_char.'.'.$this->_escape_char, $item).$this->_escape_char;			

 		}

 		else

 		{

-			return "`{$item}`";

+			$str = $this->_escape_char.$item.$this->_escape_char;

 		}

-

-		$exceptions = array('AS', '/', '-', '%', '+', '*', 'OR', 'IS');

-		

-		foreach ($exceptions as $exception)

-		{

 		

-			if (stristr($item, " `{$exception}` ") !== FALSE)

-			{

-				$item = preg_replace('/ `('.preg_quote($exception).')` /i', ' $1 ', $item);

-			}

-		}

-		return $item;

+		// remove duplicates if the user already included the escape

+		return preg_replace('/['.$this->_escape_char.']+/', $this->_escape_char, $str);

 	}

 			

 	// --------------------------------------------------------------------

@@ -532,7 +468,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */

 	function _insert($table, $keys, $values)

 	{	

-		return "INSERT INTO ".$this->_escape_table($table)." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";

+		return "INSERT INTO ".$table." (".implode(', ', $keys).") VALUES (".implode(', ', $values).")";

 	}

 	

 	// --------------------------------------------------------------------

@@ -561,8 +497,10 @@ class CI_DB_mysqli_driver extends CI_DB {
 		

 		$orderby = (count($orderby) >= 1)?' ORDER BY '.implode(", ", $orderby):'';

 	

-		$sql = "UPDATE ".$this->_escape_table($table)." SET ".implode(', ', $valstr);

+		$sql = "UPDATE ".$table." SET ".implode(', ', $valstr);

+		

 		$sql .= ($where != '' AND count($where) >=1) ? " WHERE ".implode(" ", $where) : '';

+		

 		$sql .= $orderby.$limit;

 		

 		return $sql;

@@ -584,7 +522,7 @@ class CI_DB_mysqli_driver extends CI_DB {
 	 */	

 	function _truncate($table)

 	{

-		return "TRUNCATE ".$this->_escape_table($table);

+		return "TRUNCATE ".$table;

 	}

 	

 	// --------------------------------------------------------------------