171 lines
4.6 KiB
Haskell
171 lines
4.6 KiB
Haskell
--------------------------------------------------------------------------------
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-- VPN plugin
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--
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-- Use the networkmanager to detect when a VPN interface is added or removed.
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-- Specifically, monitor the object tree to detect paths with the interface
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-- "org.freedesktop.NetworkManager.Device.Tun".
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module Xmobar.Plugins.VPN
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( VPN (..)
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, vpnAlias
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, vpnDep
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)
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where
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import DBus
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import Data.Internal.DBus
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import Data.Internal.XIO
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import RIO
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import qualified RIO.Map as M
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import qualified RIO.Text as T
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import XMonad.Internal.Command.Desktop
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import XMonad.Internal.DBus.Common
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import Xmobar
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import Xmobar.Plugins.Common
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newtype VPN = VPN (T.Text, Colors) deriving (Read, Show)
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instance Exec VPN where
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alias (VPN _) = T.unpack vpnAlias
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start (VPN (text, colors)) cb =
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withDBusClientConnection cb (Just "vpn.log") $ \c -> do
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let dpy = displayMaybe cb formatter . Just =<< readState
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s <- newEmptyMVar
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mapRIO (VEnv c s dpy) $ do
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initState
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vpnAddedListener addedCallback
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vpnRemovedListener removedCallback
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dpy
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where
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formatter names = return $ case names of
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[] -> colorText colors False text
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xs -> T.unwords [T.intercalate "|" xs, colorText colors True text]
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--------------------------------------------------------------------------------
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-- VPN State
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--
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-- Maintain a set of paths which are the currently active VPNs. Most of the time
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-- this will be a null or singleton set, but this setup could handle the edge
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-- case of multiple VPNs being active at once without puking.
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data VEnv c = VEnv
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{ vClient :: !c
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, vState :: !(MVar VPNState)
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, vDisplay :: !(VIO ())
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, vEnv :: !SimpleApp
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}
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instance HasLogFunc (VEnv c) where
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logFuncL = lens vEnv (\x y -> x {vEnv = y}) . logFuncL
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instance HasClient VEnv where
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clientL = lens vClient (\x y -> x {vClient = y})
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type VIO = RIO (VEnv SysClient)
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type VPNState = M.Map ObjectPath T.Text
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initState :: VIO ()
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initState = do
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ot <- getVPNObjectTree
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s <- asks vState
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putMVar s $ findTunnels ot
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readState :: VIO [T.Text]
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readState = M.elems <$> (readMVar =<< asks vState)
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insertState :: ObjectPath -> T.Text -> VIO ()
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insertState op name = do
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s <- asks vState
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modifyMVar_ s $ return . M.insert op name
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deleteState :: ObjectPath -> VIO ()
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deleteState op = do
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s <- asks vState
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modifyMVar_ s $ return . M.delete op
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beforeDisplay :: VIO () -> VIO ()
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beforeDisplay f = f >> join (asks vDisplay)
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--------------------------------------------------------------------------------
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-- Tunnel Device Detection
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getVPNObjectTree
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:: ( SafeClient c
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, HasClient env
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, MonadReader (env c) m
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, HasLogFunc (env c)
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, MonadUnliftIO m
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)
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=> m ObjectTree
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getVPNObjectTree = callGetManagedObjects vpnBus vpnPath
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findTunnels :: ObjectTree -> VPNState
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findTunnels = M.mapMaybe lookupVPNInterface
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-- | For the interface map underneath a given object path, try to lookup a
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-- VPN interface, then lookup the ip link name from the parent interface
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lookupVPNInterface :: M.Map T.Text (M.Map T.Text Variant) -> Maybe T.Text
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lookupVPNInterface m
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| isJust $ M.lookup vpnDeviceTun m =
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fromVariant =<< M.lookup "Interface" =<< M.lookup vpnDeviceParent m
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| otherwise = Nothing
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vpnAddedListener
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:: ( SafeClient c
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, HasClient env
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, MonadReader (env c) m
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, HasLogFunc (env c)
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, MonadUnliftIO m
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)
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=> SignalCallback m
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-> m ()
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vpnAddedListener cb = void $ addInterfaceAddedListener vpnBus vpnPath cb
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vpnRemovedListener
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:: ( SafeClient c
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, HasClient env
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, MonadReader (env c) m
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, HasLogFunc (env c)
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, MonadUnliftIO m
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)
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=> SignalCallback m
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-> m ()
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vpnRemovedListener cb = void $ addInterfaceRemovedListener vpnBus vpnPath cb
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addedCallback :: SignalCallback VIO
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addedCallback [device, added] =
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beforeDisplay $
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forM_ (fromVariant device) $ \d ->
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forM_ (lookupVPNInterface =<< fromVariant added) $
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insertState d
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addedCallback _ = return ()
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removedCallback :: SignalCallback VIO
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removedCallback [device, _] =
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beforeDisplay $ forM_ (fromVariant device) deleteState
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removedCallback _ = return ()
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--------------------------------------------------------------------------------
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-- DBus Interface
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vpnBus :: BusName
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vpnBus = busName_ "org.freedesktop.NetworkManager"
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vpnPath :: ObjectPath
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vpnPath = objectPath_ "/org/freedesktop"
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vpnDeviceTun :: T.Text
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vpnDeviceTun = "org.freedesktop.NetworkManager.Device.Tun"
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vpnDeviceParent :: T.Text
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vpnDeviceParent = "org.freedesktop.NetworkManager.Device"
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vpnAlias :: T.Text
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vpnAlias = "vpn"
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vpnDep :: DBusDependency_ SysClient
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vpnDep =
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Endpoint networkManagerPkgs networkManagerBus vpnPath omInterface $
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Method_ getManagedObjects
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