Minor refactoring

lib/request/inject.py

@@ -49,6 +49,7 @@ from lib.core.unescaper import unescaper
 from lib.request.connect import Connect as Request
 from lib.request.direct import direct
 from lib.techniques.blind.inference import bisection
+from lib.techniques.dns.test import dnsTest
 from lib.techniques.dns.use import dnsUse
 from lib.techniques.error.use import errorUse
 from lib.techniques.union.use import unionUse
@@ -85,19 +86,7 @@ def __goDns(payload, expression):
 
     if conf.dnsDomain and kb.dnsTest is not False:
         if kb.dnsTest is None:
-            logger.info("testing for data retrieval through DNS channel")
+            dnsTest(payload)
-
-            randInt = randomInt()
-            kb.dnsTest = dnsUse(payload, "SELECT %d%s" % (randInt, FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms(), ""))) == str(randInt)
-
-            if not kb.dnsTest:
-                errMsg = "data retrieval through DNS channel failed. Turning off DNS exfiltration support"
-                logger.error(errMsg)
-
-                conf.dnsDomain = None
-            else:
-                infoMsg = "data retrieval through DNS channel was successful"
-                logger.info(infoMsg)
 
         if kb.dnsTest:
             value = dnsUse(payload, expression)

lib/techniques/dns/test.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+
+"""
+$Id$
+
+Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
+See the file 'doc/COPYING' for copying permission
+"""
+
+from lib.core.common import Backend
+from lib.core.common import randomInt
+from lib.core.data import conf
+from lib.core.data import kb
+from lib.core.data import logger
+from lib.core.settings import FROM_DUMMY_TABLE
+from lib.techniques.dns.use import dnsUse
+
+
+def dnsTest(payload):
+    logger.info("testing for data retrieval through DNS channel")
+
+    randInt = randomInt()
+    kb.dnsTest = dnsUse(payload, "SELECT %d%s" % (randInt, FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms(), ""))) == str(randInt)
+
+    if not kb.dnsTest:
+        errMsg = "data retrieval through DNS channel failed. Turning off DNS exfiltration support"
+        logger.error(errMsg)
+
+        conf.dnsDomain = None
+    else:
+        infoMsg = "data retrieval through DNS channel was successful"
+        logger.info(infoMsg)

lib/techniques/dns/use.py

@@ -34,11 +34,29 @@ from lib.core.data import logger
 from lib.core.data import queries
 from lib.core.enums import DBMS
 from lib.core.enums import PAYLOAD
+from lib.core.settings import FROM_DUMMY_TABLE
 from lib.core.settings import MAX_DNS_LABEL
 from lib.core.settings import PARTIAL_VALUE_MARKER
 from lib.core.unescaper import unescaper
 from lib.request.connect import Connect as Request
 
+
+def dnsTest(payload):
+    logger.info("testing for data retrieval through DNS channel")
+
+    randInt = randomInt()
+    kb.dnsTest = dnsUse(payload, "SELECT %d%s" % (randInt, FROM_DUMMY_TABLE.get(Backend.getIdentifiedDbms(), ""))) == str(randInt)
+
+    if not kb.dnsTest:
+        errMsg = "data retrieval through DNS channel failed. Turning off DNS exfiltration support"
+        logger.error(errMsg)
+
+        conf.dnsDomain = None
+    else:
+        infoMsg = "data retrieval through DNS channel was successful"
+        logger.info(infoMsg)
+
+
 def dnsUse(payload, expression):
     """
     Retrieve the output of a SQL query taking advantage of the DNS