Add a "timeout" command-line argument.

[haeredes.git] / src / Main.hs

diff --git a/src/Main.hs b/src/Main.hs
index 0c215b758a59501b6d4c8bd049a5dd4cab53e9ee..4e0da6b6dc0296e730025f5295219eeaae254fe1 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -4,39 +4,55 @@ where
 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),
+  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) =
-  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" 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
@@ -59,19 +75,35 @@ main = do
   -- 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