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module Network.DNS.Query (composeQuery) where
import qualified Data.ByteString.Lazy.Char8 as BL (ByteString)
import qualified Data.ByteString as BS (unpack)
import qualified Data.ByteString.Char8 as BS (length, split, null)
import Network.DNS.StateBinary
import Network.DNS.Internal
import Data.Monoid
(+++) :: Monoid a => a -> a -> a
(+++) = mappend
----------------------------------------------------------------
composeQuery :: Int -> [Question] -> BL.ByteString
composeQuery idt qs = runSPut (encodeQuery qry)
where
hdr = header defaultQuery
qry = defaultQuery {
header = hdr {
identifier = idt
, qdCount = length qs
}
, question = qs
}
----------------------------------------------------------------
encodeQuery :: DNSFormat -> SPut
encodeQuery fmt = encodeHeader hdr
+++ encodeQuestion qs
where
hdr = header fmt
qs = question fmt
encodeHeader :: DNSHeader -> SPut
encodeHeader hdr = encodeIdentifier (identifier hdr)
+++ encodeFlags (flags hdr)
+++ decodeQdCount (qdCount hdr)
+++ decodeAnCount (anCount hdr)
+++ decodeNsCount (nsCount hdr)
+++ decodeArCount (arCount hdr)
where
encodeIdentifier = putInt16
decodeQdCount = putInt16
decodeAnCount = putInt16
decodeNsCount = putInt16
decodeArCount = putInt16
encodeFlags :: DNSFlags -> SPut
encodeFlags _ = put16 0x0100 -- xxx
encodeQuestion :: [Question] -> SPut
encodeQuestion qs = encodeDomain dom
+++ putInt16 (typeToInt typ)
+++ put16 1
where
q = head qs
dom = qname q
typ = qtype q
----------------------------------------------------------------
encodeDomain :: Domain -> SPut
encodeDomain dom = foldr ((+++) . encodeSubDomain) (put8 0) $ zip ls ss
where
ss = filter (not . BS.null) $ BS.split '.' dom
ls = map BS.length ss
encodeSubDomain :: (Int, Domain) -> SPut
encodeSubDomain (len,sub) = putInt8 len
+++ foldr ((+++) . put8) mempty ss
where
ss = BS.unpack sub
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