added the whitelist_wash function

lib/exploitation/exploiter.py

@@ -1,6 +1,22 @@
 import lib.settings
 import lib.output
 
+def whitelist_wash(hosts, whitelist_file):
+    """
+    remove IPs from hosts list that do not appear in WHITELIST_FILE
+    """
+    whitelist_hosts = open(whitelist_file).readlines()
+    lib.output.info('Found {} entries in whitelist.txt, scrubbing'.format(str(len(whitelist_hosts))))
+    washed_hosts = []
+    #return supplied hosts if whitelist file is empty
+    if len(whitelist_hosts) == 0:
+        return hosts
+    else:
+        for host in hosts:
+            if host in whitelist_hosts:
+                washed_hosts.append(host)
+
+    return washed_hosts
 
 class AutoSploitExploiter(object):