X-Git-Url: http://gitweb.michael.orlitzky.com/?p=haeredes.git;a=blobdiff_plain;f=src%2FMain.hs;h=d425734c275404e24310edb650ac33c9b4fe0b67;hp=b141e302f8298e50ef10600616b3084b64cc6c18;hb=70dffd6160208adf2c1c5746924c100cb0ffcb2e;hpb=e5168c9d5f32912d4e77713935e8c09a468bfd01

diff --git a/src/Main.hs b/src/Main.hs
index b141e30..d425734 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,6 +1,83 @@
 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