PowerDns.hs

   1 module PowerDns ( RRType(..)
   2                 , PdnsRequest(..)
   3                 , pdnsParse
   4                 , pdnsOut
   5                 ) where
   6
   7 import NmcJson
   8
   9 data RRType = RRTypeSRV   | RRTypeA   | RRTypeAAAA | RRTypeCNAME
  10             | RRTypeDNAME | RRTypeSOA | RRTypeRP   | RRTypeLOC
  11             | RRTypeNS    | RRTypeDS
  12             | RRTypeANY   | RRTypeError String
  13         deriving (Show)
  14
  15 data PdnsRequest = PdnsRequestQ
  16                    { qName              :: String
  17                    , qType              :: RRType
  18                    , iD                 :: String
  19                    , remoteIpAddress    :: String
  20                    , localIpAddress     :: Maybe String
  21                    , ednsSubnetAddress  :: Maybe String
  22                    }
  23                  | PdnsRequestAXFR String
  24                  | PdnsRequestPing
  25         deriving (Show)
  26
  27 pdnsParse ver s =
  28   let
  29     getQt qt = case qt of
  30       "SRV"     -> RRTypeSRV
  31       "A"       -> RRTypeA
  32       "AAAA"    -> RRTypeAAAA
  33       "CNAME"   -> RRTypeCNAME
  34       "DNAME"   -> RRTypeDNAME
  35       "SOA"     -> RRTypeSOA
  36       "RP"      -> RRTypeRP
  37       "LOC"     -> RRTypeLOC
  38       "NS"      -> RRTypeNS
  39       "DS"      -> RRTypeDS
  40       "ANY"     -> RRTypeANY
  41       _         -> RRTypeError qt
  42     getLIp ver xs
  43       | ver >= 2  = case xs of
  44                       x:_       -> Just x
  45                       _         -> Nothing
  46       | otherwise = Nothing
  47     getRIp ver xs
  48       | ver >= 3  = case xs of
  49                       _:x:_     -> Just x
  50                       _         -> Nothing
  51       | otherwise = Nothing
  52   in
  53     case words s of
  54       "PING":[]                 -> Right PdnsRequestPing
  55       "AXFR":x:[]               -> Right (PdnsRequestAXFR x)
  56       "Q":qn:"IN":qt:id:rip:xs  -> Right (PdnsRequestQ
  57                                             { qName = qn
  58                                             , qType = getQt qt
  59                                             , iD = id
  60                                             , remoteIpAddress = rip
  61                                             , localIpAddress = getLIp ver xs
  62                                             , ednsSubnetAddress = getRIp ver xs
  63                                             })
  64       _                         -> Left $ "Unparseable PDNS Request: " ++ s
  65
  66 pdnsOut :: RRType -> NmcDom -> String
  67 pdnsOut _ d = show d