import Control.Concurrent.ParallelIO.Global (
parallel,
stopGlobalPool )
+import Control.Monad (unless)
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 System.Exit (ExitCode(..), exitWith)
+import System.IO (hPutStrLn, stderr)
+
import CommandLine (Args(..), get_args)
-import DNS (normalize)
+import DNS (
+ LookupResult,
+ lookupMX',
+ lookupNS',
+ normalize,
+ resolve_address )
+import ExitCodes (exit_bad_server)
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))
+ unless (null leftovers) $
+ 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])
+ -> LookupResult
+ -> LookupResult
clean _ p@(_, Nothing) = p
-clean ds (d, Just targets) =
- (d, Just $ targets \\ ds)
+clean delgts (d, Just targets) =
+ (d, Just $ targets \\ delgts)
+
main :: IO ()
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
- 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
+
+ let lookup_function = case cfg of
+ (NS _ _) -> lookupNS'
+ (MX _ _) -> lookupMX'
+
+ _ <- withResolver rs $ \resolver -> do
+ -- Bad stuff happens if we try to run these lookups in parallel
+ -- instead of the reports.
+ records <- mapM (lookup_function resolver) nrml_domains
+ let cleaned_records = map (clean nrml_delegates) records
+ parallel (map report cleaned_records)
+
+ stopGlobalPool