X-Git-Url: http://gitweb.michael.orlitzky.com/?p=haeredes.git;a=blobdiff_plain;f=src%2FDNS.hs;fp=src%2FDNS.hs;h=5222cbec3f3a54c1d8b334bb52b615e56b1cc2e2;hp=08d4f210434e6588edd0bcb1147b7813ecf570f3;hb=fa4220513eb9d2036c3db0cc9c518c6346050318;hpb=228abb512bcd019b98d2b3fd7b7283f5ef14d1bc

diff --git a/src/DNS.hs b/src/DNS.hs
index 08d4f21..5222cbe 100644
--- a/src/DNS.hs
+++ b/src/DNS.hs
@@ -1,4 +1,7 @@
 module DNS (
+  LookupResult,
+  lookupMX',
+  lookupNS',
   normalize
   )
 where
@@ -9,7 +12,31 @@ import qualified Data.ByteString.Char8 as BS (
   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 =
+  lookupMX resolver domain >>= return . pair_em . drop_priority
+  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 =
+  lookupNS resolver domain >>= return . pair_em
+  where
+    pair_em :: a -> (Domain, a)
+    pair_em = (,) domain
 
 -- | Normalize the given name by lowercasing and appending a trailing
 --   dot (the root) if necessary.