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module Network.Ip (
IpPrefix(..),
textIpNetwork,
IpAddress(..),
textIpAddress,
textIpAddressCidr,
allowsSubnets,
ipSubnet,
lanSubnet,
NetworkNamespace,
HasNetns(..),
addNetworkNamespace,
textNetnsName,
callOn,
) where
import Control.Concurrent.STM
import Control.Monad.Writer
import Data.Text (Text)
import Data.Text qualified as T
import Data.Word
import System.Process
newtype IpPrefix = IpPrefix [Word8]
deriving (Eq, Ord)
textIpNetwork :: IpPrefix -> Text
textIpNetwork (IpPrefix prefix) =
T.intercalate "." (map (T.pack . show) $ prefix ++ replicate (4 - length prefix) 0)
<> "/" <> T.pack (show (8 * length prefix))
data IpAddress = IpAddress IpPrefix Word8
deriving (Eq, Ord)
textIpAddress :: IpAddress -> Text
textIpAddress (IpAddress (IpPrefix prefix) num) =
T.intercalate "." $ map (T.pack . show) $ prefix ++ replicate (3 - length prefix) 0 ++ [num]
textIpAddressCidr :: IpAddress -> Text
textIpAddressCidr ip@(IpAddress (IpPrefix prefix) _) =
textIpAddress ip <> "/" <> T.pack (show (8 * length prefix))
allowsSubnets :: IpPrefix -> Bool
allowsSubnets (IpPrefix prefix) = length prefix < 3
ipSubnet :: Word8 -> IpPrefix -> IpPrefix
ipSubnet num (IpPrefix prefix) = IpPrefix (prefix ++ [num])
lanSubnet :: IpPrefix -> IpPrefix
lanSubnet (IpPrefix prefix) = IpPrefix (take 3 $ prefix ++ repeat 0)
newtype NetworkNamespace = NetworkNamespace
{ netnsName :: Text
}
deriving (Eq, Ord)
class HasNetns a where getNetns :: a -> NetworkNamespace
addNetworkNamespace :: Text -> WriterT [IO ()] STM NetworkNamespace
addNetworkNamespace name = do
tell $ (:[]) $ callCommand $ T.unpack $ "ip netns add \"" <> name <> "\""
return $ NetworkNamespace
{ netnsName = name
}
textNetnsName :: NetworkNamespace -> Text
textNetnsName = netnsName
callOn :: HasNetns a => a -> Text -> IO ()
callOn n cmd = callCommand $ T.unpack $ "ip netns exec \"" <> ns <> "\" " <> cmd
where NetworkNamespace ns = getNetns n
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