module Main
where
+import Control.Concurrent.ParallelIO.Global (
+ parallel,
+ stopGlobalPool )
+import qualified Data.ByteString.Char8 as BS (
+ getContents,
+ pack,
+ words )
+import Data.List ((\\))
+import Data.String.Utils (join)
+
+import Network.DNS (
+ Domain,
+ FileOrNumericHost(RCHostName),
+ ResolvConf(resolvInfo),
+ defaultResolvConf,
+ lookupNS,
+ makeResolvSeed,
+ withResolver )
+
+import CommandLine (Args(..), get_args)
+import DNS (normalize)
+
+report :: (Domain, Maybe [Domain]) -> IO ()
+report (d, Nothing) =
+ putStrLn $ "Domain " ++ (show d) ++ " not delegated."
+report (d, Just leftovers) =
+ if null leftovers
+ then return ()
+ else putStrLn $ "Domain " ++
+ (show d) ++
+ " delegates somewhere else: " ++
+ (join " " (map show leftovers))
+
+clean :: [Domain] -- ^ List of delegates, @ds@
+ -> (Domain, Maybe [Domain]) -- ^ Pairs of (domain name, lookup result)
+ -> (Domain, Maybe [Domain])
+clean _ p@(_, Nothing) = p
+clean ds (d, Just targets) =
+ (d, Just $ targets \\ ds)
+
+
main :: IO ()
main = do
- putStrLn "Hello, World."
+ cfg <- get_args
+
+ -- This reads stdin.
+ input <- BS.getContents
+
+ -- Split the input on any whitespace characters.
+ let raw_domains = BS.words input
+
+ -- Convert these to ByteStrings.
+ let raw_delegates = map BS.pack (delegates cfg)
+
+ -- Normalize the given names and delegates
+ 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 }
+
+ rs <- makeResolvSeed rc
+ withResolver rs $ \resolver -> do
+ -- This function keeps the domain matches with its NS records.
+ let lookupNS' = \d -> (lookupNS resolver d) >>= (return . ((,) d))
+
+ -- Bad stuff happens if we try to run these lookups in parallel
+ -- instead of the reports.
+ domains_ns <- mapM lookupNS' nrml_domains
+ let cdns = map (clean nrml_delegates) domains_ns
+
+ _ <- case cfg of
+ (NS _ _) ->
+ -- We're only checking NS records, so report what we found.
+ parallel (map report cdns)
+ (MX _ _) ->
+ return [()]
+
+ stopGlobalPool