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+module Propellor.Types.Dns where
+
+import Propellor.Types.OS (HostName)
+
+import Data.Word
+
+type Domain = String
+
+data IPAddr = IPv4 String | IPv6 String
+ deriving (Read, Show, Eq, Ord)
+
+fromIPAddr :: IPAddr -> String
+fromIPAddr (IPv4 addr) = addr
+fromIPAddr (IPv6 addr) = addr
+
+-- | Represents a bind 9 named.conf file.
+data NamedConf = NamedConf
+ { confDomain :: Domain
+ , confDnsServerType :: DnsServerType
+ , confFile :: FilePath
+ , confMasters :: [IPAddr]
+ , confAllowTransfer :: [IPAddr]
+ , confLines :: [String]
+ }
+ deriving (Show, Eq, Ord)
+
+data DnsServerType = Master | Secondary
+ deriving (Show, Eq, Ord)
+
+-- | Represents a bind 9 zone file.
+data Zone = Zone
+ { zDomain :: Domain
+ , zSOA :: SOA
+ , zHosts :: [(BindDomain, Record)]
+ }
+ deriving (Read, Show, Eq)
+
+-- | Every domain has a SOA record, which is big and complicated.
+data SOA = SOA
+ { sDomain :: BindDomain
+ -- ^ Typically ns1.your.domain
+ , sSerial :: SerialNumber
+ -- ^ The most important parameter is the serial number,
+ -- which must increase after each change.
+ , sRefresh :: Integer
+ , sRetry :: Integer
+ , sExpire :: Integer
+ , sNegativeCacheTTL :: Integer
+ }
+ deriving (Read, Show, Eq)
+
+-- | Types of DNS records.
+--
+-- This is not a complete list, more can be added.
+data Record
+ = Address IPAddr
+ | CNAME BindDomain
+ | MX Int BindDomain
+ | NS BindDomain
+ | TXT String
+ | SRV Word16 Word16 Word16 BindDomain
+ deriving (Read, Show, Eq, Ord)
+
+getIPAddr :: Record -> Maybe IPAddr
+getIPAddr (Address addr) = Just addr
+getIPAddr _ = Nothing
+
+getCNAME :: Record -> Maybe BindDomain
+getCNAME (CNAME d) = Just d
+getCNAME _ = Nothing
+
+getNS :: Record -> Maybe BindDomain
+getNS (NS d) = Just d
+getNS _ = Nothing
+
+-- | Bind serial numbers are unsigned, 32 bit integers.
+type SerialNumber = Word32
+
+-- | Domains in the zone file must end with a period if they are absolute.
+--
+-- Let's use a type to keep absolute domains straight from relative
+-- domains.
+--
+-- The RootDomain refers to the top level of the domain, so can be used
+-- to add nameservers, MX's, etc to a domain.
+data BindDomain = RelDomain Domain | AbsDomain Domain | RootDomain
+ deriving (Read, Show, Eq, Ord)
+
+domainHostName :: BindDomain -> Maybe HostName
+domainHostName (RelDomain d) = Just d
+domainHostName (AbsDomain d) = Just d
+domainHostName RootDomain = Nothing