resolve_address )
where
-import Control.Applicative ((<$>))
import Control.Monad (liftM)
import qualified Data.ByteString.Char8 as BS (
append,
import Data.IP (IPv4)
import Network.DNS (
Domain,
- DNSFormat(..),
+ DNSError,
Resolver,
- RDATA(..),
- TYPE(..),
defaultResolvConf,
lookupA,
lookupMX,
lookupNS,
- lookupRaw,
+ lookupNSAuth,
makeResolvSeed,
- rdata,
- rrtype,
withResolver )
import Test.Framework (Test, testGroup)
import Test.Framework.Providers.HUnit (testCase)
import Test.HUnit (assertEqual)
import Text.Read (readMaybe)
-type LookupResult = (Domain, Maybe [Domain])
-
--- | Perform a query, but take the result from the authority section
--- of the response rather than the answer section. Code shamelessly
--- stolen from Network.DNS.lookup.
-lookup_authority :: Resolver -> Domain -> TYPE -> IO (Maybe [RDATA])
-lookup_authority rlv dom typ = (>>= toRDATA) <$> lookupRaw rlv dom typ
- where
- correct r = rrtype r == typ
- listToMaybe [] = Nothing
- listToMaybe xs = Just xs
- toRDATA = listToMaybe . map rdata . filter correct . authority
-
--- | Like lookupNS, except we take the result from the authority
--- section of the response (as opposed to the answer section).
-lookupNS_authority :: Resolver -> Domain -> IO (Maybe [Domain])
-lookupNS_authority rlv dom = toNS <$> DNS.lookup_authority rlv dom NS
- where
- toNS = fmap (map unTag)
- unTag (RD_NS dm) = dm
- unTag _ = error "lookupNS_authority"
-
+type LookupResult = (Domain, Either DNSError [Domain])
-- | Takes a String representing either a hostname or an IP
-- address. If a hostname was supplied, it is resolved to either an
--- IPv4 or Nothing. If an IP address is supplied, it is returned as an
--- IPv4.
+-- [IPv4] or an error. If an IP address is supplied, it is returned
+-- as a singleton [IPv4].
--
-- Examples:
--
-- >>> resolve_address "example.com"
--- Just 93.184.216.119
+-- Right [93.184.216.119]
-- >>> resolve_address "93.184.216.119"
--- Just 93.184.216.119
+-- Right [93.184.216.119]
--
-resolve_address :: String -> IO (Maybe IPv4)
+resolve_address :: String -> IO (Either DNSError [IPv4])
resolve_address s =
case read_result of
- Just _ -> return read_result
+ Just addr -> return $ Right [addr]
Nothing -> do
default_rs <- makeResolvSeed defaultResolvConf
- withResolver default_rs $ \resolver -> do
- result <- lookupA resolver (BS.pack s)
- return $ case result of
- Just (x:_) -> Just x
- _ -> Nothing
+ withResolver default_rs $ \resolver ->
+ lookupA resolver (BS.pack s)
where
read_result :: Maybe IPv4
read_result = readMaybe s
-- >>> rs <- makeResolvSeed defaultResolvConf
-- >>> let domain = BS.pack "example.com."
-- >>> withResolver rs $ \resolver -> lookupMX' resolver domain
--- ("example.com.",Nothing)
+-- ("example.com.",Right [])
--
lookupMX' :: Resolver -> Domain -> IO LookupResult
lookupMX' resolver domain =
liftM (pair_em . drop_priority) $ lookupMX resolver domain
where
- drop_priority :: Maybe [(Domain, Int)] -> Maybe [Domain]
+ drop_priority :: Either DNSError [(Domain, Int)]
+ -> Either DNSError [Domain]
drop_priority = fmap (map fst)
pair_em :: a -> (Domain, a)
-- them to get a reliable result.
--
-- >>> import Data.List (sort)
+-- >>> import Control.Applicative ((<$>))
+-- >>>
-- >>> let sort_snd (x,y) = (x, sort <$> y)
-- >>> rs <- makeResolvSeed defaultResolvConf
-- >>> let domain = BS.pack "example.com."
-- >>> withResolver rs $ \resolver -> sort_snd <$> lookupNS' resolver domain
--- ("example.com.",Just ["a.iana-servers.net.","b.iana-servers.net."])
+-- ("example.com.",Right ["a.iana-servers.net.","b.iana-servers.net."])
--
lookupNS' :: Resolver -> Domain -> IO LookupResult
lookupNS' resolver domain = do
answer_result <- lookupNS resolver domain
- auth_result <- lookupNS_authority resolver domain
+ auth_result <- lookupNSAuth resolver domain
liftM pair_em $ return $ combine answer_result auth_result
where
pair_em :: a -> (Domain, a)
pair_em = (,) domain
- combine :: (Maybe [Domain]) -> (Maybe [Domain]) -> (Maybe [Domain])
- combine Nothing Nothing = Nothing
- combine m1 Nothing = m1
- combine Nothing m2 = m2
- combine (Just ds1) (Just ds2) = Just (ds1 ++ ds2)
+ combine :: (Either DNSError [Domain])
+ -> (Either DNSError [Domain])
+ -> (Either DNSError [Domain])
+ combine e1 e2 = do
+ l1 <- e1
+ l2 <- e2
+ return (l1 ++ l2)
-- | Perform both normalize_case and normalize_root.
normalize :: Domain -> Domain