Added support to directly connect also to Microsoft SQL Server database.

Fixed direct connection to always use the same query as of UNION query SQL injection (= one query with multiple columns/entries output).
Minor fixes to Firebird/Access/SQLite connectors to use connector's execute()/fetchall() as wrapper for third-party libraries' methods.
Forced conf.timeout to 10 seconds when directly connecting to database.
Slightly improved regular expression to parse -d parameter.
Added import check for all connectors' third-party libraries.
Code refactoring:
* Moved conf.direct request to direct() function in lib/request/direct.py (code reused where needed).
* Back-delegated to generic connector close() and other methods.

lib/request/direct.py

@@ -0,0 +1,64 @@
+#!/usr/bin/env python
+
+"""
+$Id$
+
+This file is part of the sqlmap project, http://sqlmap.sourceforge.net.
+
+Copyright (c) 2007-2010 Bernardo Damele A. G. <bernardo.damele@gmail.com>
+Copyright (c) 2006 Daniele Bellucci <daniele.bellucci@gmail.com>
+
+sqlmap is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation version 2 of the License.
+
+sqlmap is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+details.
+
+You should have received a copy of the GNU General Public License along
+with sqlmap; if not, write to the Free Software Foundation, Inc., 51
+Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+
+from lib.core.agent import agent
+from lib.core.data import conf
+from lib.core.data import kb
+from lib.core.settings import SQL_STATEMENTS
+
+def direct(query, content=True):
+    output = None
+    select = False
+    query = agent.payloadDirect(query)
+
+    if kb.dbms == "Oracle" and query.startswith("SELECT ") and " FROM " not in query:
+        query = "%s FROM DUAL" % query
+
+    for sqlTitle, sqlStatements in SQL_STATEMENTS.items():
+        for sqlStatement in sqlStatements:
+            if query.lower().startswith(sqlStatement) and sqlTitle == "SQL SELECT statement":
+                select = True
+                break
+
+    if select:
+        output = conf.dbmsConnector.select(query)
+    else:
+        output = conf.dbmsConnector.execute(query)
+
+    if output is None or len(output) == 0:
+        return None
+    elif content:
+        if len(output) == 1:
+            if len(output[0]) == 1:
+                return str(list(output)[0][0])
+            else:
+                return list(output)
+        else:
+            return output
+    else:
+        for line in output:
+            if line[0] in (1, -1):
+                return True
+            else:
+                return False