X-Git-Url: http://gitweb.michael.orlitzky.com/?p=haeredes.git;a=blobdiff_plain;f=src%2FMain.hs;h=4aa0c326de6f5ebbc81bd371a1c46c31dac10bd0;hp=4da383352360ee4a37a552805a5da88897c27c4f;hb=e8fe3d4c76b719d256a3c04d462819cd98218111;hpb=7d54d3e3e239342eae8b7fda5f5e4fb43adbbde8

diff --git a/src/Main.hs b/src/Main.hs
index 4da3833..4aa0c32 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -11,7 +11,6 @@ import qualified Data.ByteString.Char8 as BS (
   words )
 import Data.List ((\\))
 import Data.String.Utils (join)
-
 import Network.DNS (
   Domain,
   FileOrNumericHost(RCHostName),
@@ -19,13 +18,18 @@ import Network.DNS (
   defaultResolvConf,
   makeResolvSeed,
   withResolver )
+import System.Exit (ExitCode(..), exitWith)
+import System.IO (hPutStrLn, stderr)
+
 
 import CommandLine (Args(..), get_args)
 import DNS (
   LookupResult,
   lookupMX',
   lookupNS',
-  normalize )
+  normalize,
+  resolve_address )
+import ExitCodes (exit_bad_server)
 
 report :: (Domain, Maybe [Domain]) -> IO ()
 report (d, Nothing) =
@@ -63,9 +67,17 @@ main = do
   let nrml_domains   = map normalize raw_domains
   let nrml_delegates = map normalize raw_delegates
 
-  let rc = case (server cfg) of
-             Nothing -> defaultResolvConf
-             Just s -> defaultResolvConf { resolvInfo = RCHostName s }
+  rc <- case (server cfg) of
+          Nothing -> return defaultResolvConf
+          Just s -> do
+            s' <- resolve_address s
+            case s' of
+              Nothing -> do
+                hPutStrLn stderr ("Bad DNS server or lookup error: " ++ s)
+                exitWith (ExitFailure exit_bad_server)
+              Just s'' ->
+                return $ defaultResolvConf { resolvInfo =
+                                               RCHostName (show s'') }
 
   rs <- makeResolvSeed rc