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.

plugins/dbms/postgresql/fingerprint.py

@@ -86,9 +86,6 @@ class Fingerprint(GenericFingerprint):
         * http://www.postgresql.org/docs/8.4/interactive/release.html (up to 8.4.2)
         """
 
-        infoMsg = "testing PostgreSQL"
-        logger.info(infoMsg)
-
         if conf.dbms in PGSQL_ALIASES:
             setDbms("PostgreSQL")
 
@@ -97,6 +94,9 @@ class Fingerprint(GenericFingerprint):
             if not conf.extensiveFp:
                 return True
 
+        infoMsg = "testing PostgreSQL"
+        logger.info(infoMsg)
+
         randInt = str(randomInt(1))
 
         payload = agent.fullPayload(" AND %s::int=%s" % (randInt, randInt))