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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
import Data.Monoid
(+++) :: Monoid a => a -> a -> a
(+++) = mappend
----------------------------------------------------------------
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 = 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 . fromIntegral
decodeQdCount = putInt16 . fromIntegral
decodeAnCount = putInt16 . fromIntegral
decodeNsCount = putInt16 . fromIntegral
decodeArCount = putInt16 . fromIntegral
encodeFlags :: DNSFlags -> SPut
encodeFlags _ = put16 0x0100 -- xxx
encodeQuestion :: [Question] -> SPut
encodeQuestion qs = encodeDomain dom
+++ putInt16 (fromIntegral (typeToInt typ))
+++ put16 1
where
q = head qs
dom = qname q
typ = qtype q
----------------------------------------------------------------
encodeDomain :: Domain -> SPut
encodeDomain dom = foldr (+++) (put8 0) (map encodeSubDomain $ zip ls ss)
where
ss = split '.' dom
ls = map length ss
encodeSubDomain (len,sub) = putInt8 (fromIntegral len)
+++ foldr (+++) mempty (map (putInt8 . fromIntegral . 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
|
