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module Network.DNS.Internal where
import Data.Maybe
import Data.IP
----------------------------------------------------------------
data TYPE = A | AAAA | NS | TXT | MX | CNAME | UNKNOWN deriving (Eq, Show, Read)
rrDB :: [(TYPE, Int)]
rrDB = [
(A, 1)
, (NS, 2)
, (CNAME, 5)
, (MX, 15)
, (TXT, 16)
, (AAAA, 28)
]
rookup :: (Eq b) => b -> [(a,b)] -> Maybe a
rookup _ [] = Nothing
rookup key ((x,y):xys)
| key == y = Just x
| otherwise = rookup key xys
intToType :: Int -> TYPE
intToType n = maybe UNKNOWN id $ rookup n rrDB
typeToInt :: TYPE -> Int
typeToInt t = maybe 0 id $ lookup t rrDB
----------------------------------------------------------------
data QorR = QR_Query | QR_Response deriving (Eq, Show)
data OPCODE = OP_STD | OP_INV | OP_SSR deriving (Eq, Show, Enum)
data RCODE = NoErr | FormatErr | ServFail | NameErr | NotImpl | Refused deriving (Eq, Show, Enum)
----------------------------------------------------------------
type Domain = String
----------------------------------------------------------------
data Question = Question {
qname :: Domain
, qtype :: TYPE
} deriving (Eq, Show)
makeQuestion :: Domain -> TYPE -> Question
makeQuestion dom typ = Question dom typ
----------------------------------------------------------------
data ResourceRecord = ResourceRecord {
rrname :: Domain
, rrtype :: TYPE
, rrttl :: Int
, rdlen :: Int
, rdata :: RDATA
} deriving (Eq, Show)
data RDATA = RD_NS Domain | RD_CNAME Domain
| RD_A IPv4 | RD_AAAA IPv6
| RD_OTH [Int] deriving (Eq)
instance Show RDATA where
show (RD_NS dom) = dom
show (RD_CNAME dom) = dom
show (RD_A a) = show a
show (RD_AAAA aaaa) = show aaaa
show (RD_OTH is) = show is
----------------------------------------------------------------
data DNSFlags = DNSFlags {
qOrR :: QorR
, opcode :: OPCODE
, authAnswer :: Bool
, trunCation :: Bool
, recDesired :: Bool
, recAvailable :: Bool
, rcode :: RCODE
} deriving (Eq, Show)
data DNSHeader = DNSHeader {
identifier :: Int
, flags :: DNSFlags
, qdCount :: Int
, anCount :: Int
, nsCount :: Int
, arCount :: Int
} deriving (Eq, Show)
data DNSFormat = DNSFormat {
header :: DNSHeader
, question :: [Question]
, answer :: [ResourceRecord]
, authority :: [ResourceRecord]
, additional :: [ResourceRecord]
} deriving (Eq, Show)
----------------------------------------------------------------
defaultQuery :: DNSFormat
defaultQuery = DNSFormat {
header = DNSHeader {
identifier = 0
, flags = undefined
, qdCount = 0
, anCount = 0
, nsCount = 0
, arCount = 0
}
, question = []
, answer = []
, authority = []
, additional = []
}
|
