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module Network.DNS.Query (composeQuery) where
import qualified Data.ByteString.Lazy.Char8 as L
import Data.Char
import Network.DNS.StateBinary
import Network.DNS.Internal
----------------------------------------------------------------
composeQuery :: Int -> [Question] -> L.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 = do
let hdr = header fmt
qs = question fmt
encodeHeader hdr
encodeQuestion qs
return ()
encodeHeader :: DNSHeader -> SPut
encodeHeader hdr = do
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 = do
let q = head qs
dom = qname q
typ = qtype q
encodeDomain dom
putInt16 . typeToInt $ typ
put16 1
----------------------------------------------------------------
encodeDomain :: Domain -> SPut
encodeDomain dom = do
let ss = split '.' dom
ls = map length ss
mapM_ encodeSubDomain $ zip ls ss
put8 0
where
encodeSubDomain (len,sub) = do
putInt8 len
mapM_ (putInt8 . ord) sub
split :: Char -> String -> [String]
split _ "" = []
split c cs
| null rest = s : split c rest
| otherwise = s : split c (tail rest)
where
(s,rest) = break (c ==) cs
|