import qualified Data.IntMap as IM
import Data.IntMap (IntMap)
import Data.Word
+import Network.DNS.Unpacker as U
import Network.Socket
-replicateM' :: Monad m => Int -> (a -> m (b, a)) -> a -> m ([b], a)
-replicateM' = worker []
- where
- worker :: Monad m => [b] -> Int -> (a -> m (b, a)) -> a -> m ([b], a)
- worker soFar 0 _ a = return (reverse soFar, a)
- worker soFar n f a = do (b, a') <- f a
- worker (b : soFar) (n - 1) f a'
-
-
data Message
= Message {
msgHeader :: !Header
putSomeRT $ qType q
put $ qClass q
-getQ :: DecompTable -> Get (Question, DecompTable)
-getQ dt
- = do (nm, dt') <- getDomainName dt
- ty <- getSomeRT
- cl <- get
- let q = Question {
- qName = nm
- , qType = ty
- , qClass = cl
- }
- return (q, dt')
+getQ :: Unpacker DecompTable Question
+getQ = do nm <- getDomainName
+ ty <- getSomeRT
+ cl <- getBinary
+ return Question {
+ qName = nm
+ , qType = ty
+ , qClass = cl
+ }
+
newtype DomainName = DN [DomainLabel] deriving (Eq, Show, Typeable)
type DomainLabel = BS.ByteString
putLazyByteString dat
-getRR :: forall rt dt. RecordType rt dt => DecompTable -> rt -> Get (ResourceRecord rt dt, DecompTable)
-getRR dt rt
- = do (nm, dt1) <- getDomainName dt
- G.skip 2 -- record type
- cl <- get
- ttl <- G.getWord32be
- G.skip 2 -- data length
- (dat, dt2) <- getRecordData (undefined :: rt) dt1
-
- let rr = ResourceRecord {
- rrName = nm
- , rrType = rt
- , rrClass = cl
- , rrTTL = ttl
- , rrData = dat
- }
- return (rr, dt2)
-
-
data SomeRR = forall rt dt. RecordType rt dt => SomeRR (ResourceRecord rt dt)
instance Show SomeRR where
putSomeRR :: SomeRR -> Put
putSomeRR (SomeRR rr) = putRR rr
-getSomeRR :: DecompTable -> Get (SomeRR, DecompTable)
-getSomeRR dt
- = do srt <- lookAhead $
- do getDomainName dt -- skip
- getSomeRT
- case srt of
- SomeRT rt -> getRR dt rt >>= \ (rr, dt') -> return (SomeRR rr, dt')
-
+getSomeRR :: Unpacker DecompTable SomeRR
+getSomeRR = do srt <- U.lookAhead $
+ do getDomainName -- skip
+ getSomeRT
+ case srt of
+ SomeRT rt
+ -> getResourceRecord rt >>= return . SomeRR
type DecompTable = IntMap DomainName
type TTL = Word32
-getDomainName :: DecompTable -> Get (DomainName, DecompTable)
+getDomainName :: Unpacker DecompTable DomainName
getDomainName = worker
where
- worker :: DecompTable -> Get (DomainName, DecompTable)
- worker dt
- = do offset <- liftM fromIntegral bytesRead
+ worker :: Unpacker DecompTable DomainName
+ worker
+ = do offset <- U.bytesRead
hdr <- getLabelHeader
case hdr of
Offset n
- -> case IM.lookup n dt of
- Just name
- -> return (name, dt)
- Nothing
- -> fail ("Illegal offset of label pointer: " ++ show (n, dt))
+ -> do dt <- getState
+ case IM.lookup n dt of
+ Just name
+ -> return name
+ Nothing
+ -> fail ("Illegal offset of label pointer: " ++ show (n, dt))
Length 0
- -> return (rootName, dt)
+ -> return rootName
Length n
- -> do label <- getByteString n
- (rest, dt') <- worker dt
+ -> do label <- U.getByteString n
+ rest <- worker
let name = consLabel label rest
- dt'' = IM.insert offset name dt'
- return (name, dt'')
+ modifyState $ IM.insert offset name
+ return name
- getLabelHeader :: Get LabelHeader
+ getLabelHeader :: Unpacker s LabelHeader
getLabelHeader
- = do header <- lookAhead $ getByteString 1
+ = do header <- U.lookAhead $ U.getByteString 1
let Right h
= runBitGet header $
do a <- getBit
_ -> fail "Illegal label header"
case h of
Offset _
- -> do header' <- getByteString 2 -- Pointers have 2 octets.
+ -> do header' <- U.getByteString 2 -- Pointers have 2 octets.
let Right h'
= runBitGet header' $
do BG.skip 2
return $ Offset n
return h'
len@(Length _)
- -> do G.skip 1
+ -> do U.skip 1
return len
-getCharString :: Get BS.ByteString
-getCharString = do len <- G.getWord8
- getByteString (fromIntegral len)
+getCharString :: Unpacker s BS.ByteString
+getCharString = do len <- U.getWord8
+ U.getByteString (fromIntegral len)
putCharString :: BS.ByteString -> Put
putCharString = putDomainLabel
class (Show rt, Show dt, Eq rt, Eq dt, Typeable rt, Typeable dt) => RecordType rt dt | rt -> dt where
rtToInt :: rt -> Int
- putRecordType :: rt -> Put
putRecordData :: rt -> dt -> Put
- getRecordData :: rt -> DecompTable -> Get (dt, DecompTable)
+ getRecordData :: rt -> Unpacker DecompTable dt
+ putRecordType :: rt -> Put
putRecordType = putWord16be . fromIntegral . rtToInt
+ getResourceRecord :: rt -> Unpacker DecompTable (ResourceRecord rt dt)
+ getResourceRecord rt
+ = do name <- getDomainName
+ U.skip 2 -- record type
+ cl <- getBinary
+ ttl <- U.getWord32be
+ U.skip 2 -- data length
+ dat <- getRecordData rt
+ return $ ResourceRecord {
+ rrName = name
+ , rrType = rt
+ , rrClass = cl
+ , rrTTL = ttl
+ , rrData = dat
+ }
+
data SomeRT = forall rt dt. RecordType rt dt => SomeRT rt
instance Show SomeRT where
putSomeRT :: SomeRT -> Put
putSomeRT (SomeRT rt) = putRecordType rt
-getSomeRT :: Get SomeRT
-getSomeRT = do n <- liftM fromIntegral G.getWord16be
+getSomeRT :: Unpacker s SomeRT
+getSomeRT = do n <- liftM fromIntegral U.getWord16be
case IM.lookup n defaultRTTable of
Nothing
-> fail ("Unknown resource record type: " ++ show n)
instance RecordType A HostAddress where
rtToInt _ = 1
putRecordData _ = putWord32be
- getRecordData _ = \ dt ->
- do addr <- G.getWord32be
- return (addr, dt)
+ getRecordData _ = U.getWord32be
data NS = NS deriving (Show, Eq, Typeable)
instance RecordType NS DomainName where
rtToInt _ = 13
putRecordData _ (cpu, os) = do putCharString cpu
putCharString os
- getRecordData _ dt = do cpu <- getCharString
+ getRecordData _ = do cpu <- getCharString
os <- getCharString
- return ((cpu, os), dt)
+ return (cpu, os)
{-
mapM_ putSomeRR $ msgAuthorities m
mapM_ putSomeRR $ msgAdditionals m
- get = do hdr <- get
- nQ <- liftM fromIntegral G.getWord16be
- nAns <- liftM fromIntegral G.getWord16be
- nAth <- liftM fromIntegral G.getWord16be
- nAdd <- liftM fromIntegral G.getWord16be
- (qs , dt1) <- replicateM' nQ getQ IM.empty
- (anss, dt2) <- replicateM' nAns getSomeRR dt1
- (aths, dt3) <- replicateM' nAth getSomeRR dt2
- (adds, _ ) <- replicateM' nAdd getSomeRR dt3
+ get = liftToBinary IM.empty $
+ do hdr <- getBinary
+ nQ <- liftM fromIntegral U.getWord16be
+ nAns <- liftM fromIntegral U.getWord16be
+ nAth <- liftM fromIntegral U.getWord16be
+ nAdd <- liftM fromIntegral U.getWord16be
+ qs <- replicateM nQ getQ
+ anss <- replicateM nAns getSomeRR
+ aths <- replicateM nAth getSomeRR
+ adds <- replicateM nAdd getSomeRR
return Message {
msgHeader = hdr
, msgQuestions = qs
putNBits 4 $ fromEnum $ hdResponseCode h
get = do mID <- G.getWord16be
- flags <- getByteString 2
+ flags <- G.getByteString 2
let Right hd
= runBitGet flags $
do qr <- liftM (toEnum . fromIntegral) $ getAsWord8 1