words )
import Data.List ((\\))
import Data.String.Utils (join)
-
import Network.DNS (
Domain,
FileOrNumericHost(RCHostName),
- ResolvConf(resolvInfo),
+ ResolvConf(resolvInfo, resolvTimeout),
defaultResolvConf,
makeResolvSeed,
withResolver )
+import System.Exit (ExitCode(..), exitWith)
+import System.IO (hPutStrLn, stderr)
+
import CommandLine (Args(..), get_args)
import DNS (
LookupResult,
lookupMX',
lookupNS',
- normalize )
-
-report :: (Domain, Maybe [Domain]) -> IO ()
+ normalize,
+ normalize_case,
+ resolve_address )
+import ExitCodes (exit_bad_server)
+import Timeout (Timeout(..))
+
+
+-- | Report results for this LookupResult. If there's a Nothing 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 "cleaning"), we report those as well.
+report :: LookupResult -> IO ()
report (d, Nothing) =
putStrLn $ "Domain " ++ (show d) ++ " not delegated."
report (d, Just leftovers) =
" delegates somewhere else: " ++
(join " " (map show leftovers))
+
+-- | "Clean" a lookup result by subtracting out the list of delegates.
+-- There shouldn't be anything left over. If there were no lookup
+-- results, we leave the Nothing in place so that 'report' can
+-- pattern match on it.
clean :: [Domain] -- ^ List of delegates, @ds@
-> LookupResult
-> LookupResult
-- 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 }
+ let normalize_function =
+ if (no_append_root cfg)
+ then normalize_case
+ else normalize
+ -- Normalize the given names and delegates
+ let nrml_domains = map normalize_function raw_domains
+ let nrml_delegates = map normalize_function raw_delegates
+
+ 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'') }
+
+ -- 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) }
rs <- makeResolvSeed rc
let lookup_function = case cfg of
- (NS _ _) -> lookupNS'
- (MX _ _) -> lookupMX'
+ NS{} -> lookupNS'
+ MX{} -> lookupMX'
_ <- withResolver rs $ \resolver -> do
-- Bad stuff happens if we try to run these lookups in parallel