-module Main
+module Main (main)
where
import Control.Concurrent.ParallelIO.Global (
getContents,
pack,
words )
-import Data.List ((\\))
-import Data.String.Utils (join)
+import Data.List ( (\\), intersperse, sort )
import Network.DNS (
+ DNSError(NameError),
Domain,
FileOrNumericHost(RCHostName),
ResolvConf(resolvInfo, resolvTimeout),
defaultResolvConf,
makeResolvSeed,
+ normalize,
+ normalizeCase,
withResolver )
-import System.Exit (ExitCode(..), exitWith)
+import System.Exit (ExitCode(ExitFailure), exitWith)
import System.IO (hPutStrLn, stderr)
-
-import CommandLine (Args(..), get_args)
+import CommandLine (
+ Args(NS,MX,delegates,no_append_root,server,timeout),
+ get_args)
import DNS (
LookupResult,
lookupMX',
lookupNS',
- normalize,
- normalize_case,
resolve_address )
import ExitCodes (exit_bad_server)
-import Timeout (Timeout(..))
+import Timeout (Timeout(seconds))
-- | Given a list of delegates, report results for this
--- LookupResult.
+-- 'LookupResult'.
--
-- If there's an empty list in the second component, there were no
-- query results, so we report that the domain was not delegated. If
-- there were some results and there are leftovers (after removing
-- the delegates), we report those as well.
--
+-- Before processing, all names are normalized using the supplied
+-- function @normalize_function@. Ideally this should be the same
+-- function applied to the user-input names.
+--
report :: [Domain] -- ^ The list of @delgts@
+ -> (Domain -> Domain) -- ^ Domain name normalization function,
+ -- @normalize_function@.
-> LookupResult
-> IO ()
--- If the lookup resulted in a DNS error, we just ignore the whole
--- thing.
-report _ (_, Left _) = return ()
-
-- If the lookup succeeded but there were no results, report that the
--- domain is not delegated.
-report _ (d, Right []) =
+-- domain is not delegated. Note that the behavior of the DNS library
+-- changed with regard to this at some point: we used to get back
+-- a "success," but with an empty list of results. Now a NameError
+-- (which is not actually an error!) is returned.
+report _ _ (d, Left NameError) =
putStrLn $ "Domain " ++ (show d) ++ " not delegated."
+-- If the lookup resulted in some other DNS error, we just ignore the
+-- whole thing.
+report _ _ (_, Left _) = return ()
+
-- Otherwise, subtract our delegates from the list of results and
-- report the leftovers.
-report delgts (d, Right hosts) = do
- let leftovers = hosts \\ delgts
+report delgts normalize_function (d, Right raw_hosts) = do
+ let nrml_hosts = map normalize_function raw_hosts
+ -- Sort the leftovers so that we can test the expected output.
+ let leftovers = sort (nrml_hosts \\ delgts)
unless (null leftovers) $
putStrLn $ "Domain " ++
(show d) ++
" delegates somewhere else: " ++
(join " " (map show leftovers))
+ where
+ -- Create one big string by joining together a list of smaller
+ -- strings and placing a delimiter between them.
+ join :: String -> [String] -> String
+ join delimiter strings = concat (intersperse delimiter strings)
main :: IO ()
let normalize_function =
if (no_append_root cfg)
- then normalize_case
+ then normalizeCase
else normalize
-- Normalize the given names and delegates
-- Set the timeout from the command line. The resolvTimeout field is
-- in microseconds, so we multiply by one million.
- let rc = rc' { resolvTimeout = 1000 * 1000 * seconds (timeout cfg) }
+ let a_million = 1000 * 1000 :: Int
+ let rc = rc' { resolvTimeout = a_million * seconds (timeout cfg) }
rs <- makeResolvSeed rc
let lookup_function = case cfg of
results <- parallelInterleaved actions
-- Output the results.
- _ <- mapM (report nrml_delegates) results
+ _ <- mapM (report nrml_delegates normalize_function) results
stopGlobalPool