module DNS (
+ LookupResult,
+ lookupMX',
+ lookupNS',
normalize
)
where
+import Control.Monad (liftM)
import qualified Data.ByteString.Char8 as BS (
append,
last,
map,
pack )
import Data.Char (toLower)
-import Network.DNS.Types (Domain)
+import Network.DNS (
+ Domain,
+ Resolver,
+ lookupMX,
+ lookupNS )
+
+type LookupResult = (Domain, Maybe [Domain])
+
+lookupMX' :: Resolver -> Domain -> IO LookupResult
+lookupMX' resolver domain =
+ liftM (pair_em . drop_priority) $ lookupMX resolver domain
+ where
+ drop_priority :: Maybe [(Domain, Int)] -> Maybe [Domain]
+ drop_priority = fmap (map fst)
+
+ pair_em :: a -> (Domain, a)
+ pair_em = (,) domain
+
+-- This function keeps the domain matches with its NS records.
+lookupNS' :: Resolver -> Domain -> IO LookupResult
+lookupNS' resolver domain =
+ liftM pair_em $ lookupNS resolver domain
+ where
+ pair_em :: a -> (Domain, a)
+ pair_em = (,) domain
-- | Normalize the given name by lowercasing and appending a trailing
-- dot (the root) if necessary.