path: root/src/Network/Tox.hs

{-# LANGUAGE CPP                        #-}
{-# LANGUAGE DeriveDataTypeable         #-}
{-# LANGUAGE DeriveFoldable             #-}
{-# LANGUAGE DeriveFunctor              #-}
{-# LANGUAGE DeriveGeneric              #-}
{-# LANGUAGE DeriveTraversable          #-}
{-# LANGUAGE ExistentialQuantification  #-}
{-# LANGUAGE FlexibleInstances          #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE LambdaCase                 #-}
{-# LANGUAGE NamedFieldPuns             #-}
{-# LANGUAGE PatternSynonyms            #-}
{-# LANGUAGE RankNTypes                 #-}
{-# LANGUAGE RecursiveDo                #-}
{-# LANGUAGE ScopedTypeVariables        #-}
{-# LANGUAGE TupleSections              #-}
{-# LANGUAGE ViewPatterns               #-}
module Network.Tox where

#ifdef THREAD_DEBUG
import Control.Concurrent.Lifted.Instrument
#else
import Control.Concurrent.Lifted
#endif
import Control.Concurrent.STM
import Control.Monad
import Crypto.PubKey.Curve25519
import Crypto.Random
import Data.Bits.ByteString                   ()
import qualified Data.ByteString              as B
         ;import Data.ByteString              (ByteString)
import qualified Data.ByteString.Char8        as C8
import Data.Data
import Data.Functor.Contravariant
import Data.Maybe
import qualified Data.MinMaxPSQ               as MinMaxPSQ
import qualified Data.Serialize               as S
import Data.Time.Clock.POSIX                  (getPOSIXTime)
import Data.Word
import qualified Data.Wrapper.PSQ             as PSQ
import System.Global6
import Network.Address                        (WantIP (..))
import qualified Network.Kademlia.Routing          as R
import Network.QueryResponse
import Network.Socket
import System.Endian
import Network.BitTorrent.DHT.Token           as Token

import Connection
import Connection.Tox
import Crypto.Tox
import Data.Word64Map                        (fitsInInt)
import qualified Data.Word64Map              (empty)
import Network.Kademlia.Bootstrap            (forkPollForRefresh, bootstrap)
import Network.Tox.Crypto.Transport          (Handshake(..),CryptoPacket)
import Network.Tox.Handshake
import Network.Tox.Crypto.Handlers
import qualified Network.Tox.DHT.Handlers    as DHT
import qualified Network.Tox.DHT.Transport   as DHT
import Network.Tox.NodeId
import qualified Network.Tox.Onion.Handlers  as Onion
import qualified Network.Tox.Onion.Transport as Onion
import Network.Tox.Transport
import OnionRouter
import Network.Tox.ContactInfo
import Text.XXD
import qualified Data.HashMap.Strict as HashMap
import qualified Data.Map.Strict as Map
import DPut
import Network.Tox.Avahi
import Text.Printf
import Data.List

newCrypto :: IO TransportCrypto
newCrypto = do
    secret <- generateSecretKey
    alias <- generateSecretKey
    ralias <- generateSecretKey
    let pubkey    = toPublic secret
        aliaspub  = toPublic alias
        raliaspub = toPublic ralias
    ukeys <- atomically $ newTVar []
    (symkey, drg) <- do
        drg0 <- getSystemDRG
        return $ randomBytesGenerate 32 drg0 :: IO (ByteString, SystemDRG)
    noncevar <- atomically $ newTVar $ fst $ withDRG drg drgNew
    cookieKeys <- atomically $ newTVar []
    cache <- newSecretsCache
    dput XNetCrypto $ "secret(tox) = " ++ DHT.showHex secret
    dput XNetCrypto $ "public(tox) = " ++ DHT.showHex pubkey
    dput XNetCrypto $ "symmetric(tox) = " ++ DHT.showHex symkey
    return TransportCrypto
        { transportSecret = secret
        , transportPublic = pubkey
        , onionAliasSecret = alias
        , onionAliasPublic = aliaspub
        , rendezvousSecret = ralias
        , rendezvousPublic = raliaspub
        , transportSymmetric = return $ SymmetricKey symkey
        , transportNewNonce = do
            drg1 <- readTVar noncevar
            let (nonce, drg2) = withDRG drg1 (Nonce24 <$> getRandomBytes 24)
            writeTVar noncevar drg2
            return nonce
        , userKeys = return []
        , pendingCookies = cookieKeys
        , secretsCache = cache
        }

updateIP :: TVar (R.BucketList NodeInfo) -> SockAddr -> STM ()
updateIP tblvar a = do
    bkts <- readTVar tblvar
    case nodeInfo (nodeId (R.thisNode bkts)) a of
        Right ni -> writeTVar tblvar (bkts { R.thisNode = ni })
        Left _   -> return ()

genNonce24 :: DRG g =>
              TVar (g, pending) -> DHT.TransactionId -> IO DHT.TransactionId
genNonce24 var (DHT.TransactionId nonce8 _) = atomically $ do
    (g,pending) <- readTVar var
    let (bs, g') = randomBytesGenerate 24 g
    writeTVar var (g',pending)
    return $ DHT.TransactionId nonce8 (Nonce24 bs)


gen :: forall gen. DRG gen => gen -> (DHT.TransactionId, gen)
gen g = let (bs, g')  = randomBytesGenerate 24 g
            (ws, g'') = randomBytesGenerate 8 g'
            Right w   = S.runGet S.getWord64be ws
        in ( DHT.TransactionId (Nonce8 w) (Nonce24 bs), g'' )

intKey :: DHT.TransactionId -> Int
intKey (DHT.TransactionId (Nonce8 w) _) = fromIntegral w

w64Key :: DHT.TransactionId -> Word64
w64Key (DHT.TransactionId (Nonce8 w) _) = w

nonceKey :: DHT.TransactionId -> Nonce8
nonceKey (DHT.TransactionId n _) = n

-- | Return my own address.
myAddr :: TVar (R.BucketList NodeInfo) -- ^ IPv4 buckets
       -> TVar (R.BucketList NodeInfo) -- ^ IPv6 buckets
       -> Maybe NodeInfo             -- ^ Interested remote address
       -> IO NodeInfo
myAddr routing4 routing6 maddr = atomically $ do
    let var = case flip DHT.prefer4or6 Nothing <$> maddr of
                Just Want_IP6 -> routing4
                _             -> routing6
    a <- readTVar var
    return $ R.thisNode a

newClient :: (DRG g, Show addr, Show meth) =>
              g -> Transport String addr x
                -> (Client String meth DHT.TransactionId addr x -> x -> MessageClass String meth DHT.TransactionId addr x)
                -> (Maybe addr -> IO addr)
                -> (Client String meth DHT.TransactionId addr x -> meth -> Maybe (MethodHandler String DHT.TransactionId addr x))
                -> (forall d. TransactionMethods d DHT.TransactionId addr x -> TransactionMethods d DHT.TransactionId addr x)
                -> (Client String meth DHT.TransactionId addr x -> Transport String addr x -> Transport String addr x)
                -> IO (Client String meth DHT.TransactionId addr x)
newClient drg net classify selfAddr handlers modifytbl modifynet = do
    -- If we have 8-byte keys for IntMap, then use it for transaction lookups.
    -- Otherwise, use ordinary Map.  The details of which will be hidden by an
    -- existential closure (see mkclient below).
    --
    tblvar <-
      if fitsInInt (Proxy :: Proxy Word64)
        then do
            let intmapT = transactionMethods (contramap intKey intMapMethods) gen
            intmap_var <- atomically $ newTVar (drg, mempty)
            return $ Right (intmapT,intmap_var)
         else do
            let word64mapT = transactionMethods (contramap w64Key w64MapMethods) gen
            map_var <- atomically $ newTVar (drg, Data.Word64Map.empty)
            return $ Left (word64mapT,map_var)
    let dispatch tbl var handlers client = DispatchMethods
                { classifyInbound = classify client
                , lookupHandler = handlers -- var
                , tableMethods = modifytbl tbl
                }
        eprinter = logErrors -- printErrors stderr
        mkclient (tbl,var) handlers =
            let client = Client
                    { clientNet           = addHandler (reportParseError eprinter) (handleMessage client) $ modifynet client net
                    , clientDispatcher    = dispatch tbl var (handlers client) client
                    , clientErrorReporter = eprinter { reportTimeout = reportTimeout ignoreErrors }
                    , clientPending       = var
                    , clientAddress       = selfAddr
                    , clientResponseId    = genNonce24 var
                    , clientEnterQuery    = \_ -> return ()
                    , clientLeaveQuery    = \_ _ -> return ()
                    }
            in client
    return $ either mkclient mkclient tblvar handlers

data Tox extra  = Tox
    { toxDHT            :: DHT.Client
    , toxOnion          :: Onion.Client RouteId
    , toxToRoute        :: Transport String Onion.AnnouncedRendezvous (PublicKey,Onion.OnionData)
    , toxCrypto         :: Transport String SockAddr (CryptoPacket Encrypted)
    , toxHandshakes     :: Transport String SockAddr (Handshake Encrypted)
    , toxCryptoSessions :: NetCryptoSessions
    , toxCryptoKeys     :: TransportCrypto
    , toxRouting        :: DHT.Routing
    , toxTokens         :: TVar SessionTokens
    , toxAnnouncedKeys  :: TVar Onion.AnnouncedKeys
    , toxOnionRoutes    :: OnionRouter
    , toxContactInfo    :: ContactInfo extra
    , toxAnnounceToLan  :: IO ()
    , toxMgr            :: Manager ToxProgress Key
    }

-- | initiate a netcrypto session, blocking
netCrypto :: Tox extra -> SecretKey -> PublicKey{-UserKey -} -> IO [NetCryptoSession]
netCrypto tox myseckey theirpubkey = netCryptoWithBackoff 1000000 tox myseckey theirpubkey

-- | helper for 'netCrypto', initiate a netcrypto session, retry after specified millisecs
netCryptoWithBackoff :: Int -> Tox extra -> SecretKey -> PublicKey -> IO [NetCryptoSession]
netCryptoWithBackoff millisecs tox myseckey theirpubkey = do
    let mykeyAsId = key2id (toPublic myseckey)
    -- TODO: check status of connection here:
    mbContactsVar <- fmap contacts . HashMap.lookup mykeyAsId <$> atomically (readTVar (accounts (toxContactInfo tox)))
    case mbContactsVar of
      Nothing -> do
        dput XNetCrypto ("netCrypto: (" ++ show mykeyAsId ++") accounts lookup failed.")
        return []

      Just contactsVar -> do
        let theirkeyAsId = key2id theirpubkey
        mbContact <- HashMap.lookup theirkeyAsId <$> atomically (readTVar contactsVar)
        tup <- atomically $ do
            mc <- HashMap.lookup theirkeyAsId <$> readTVar contactsVar
            kp <- fmap join $ forM mc $ \c -> readTVar (contactKeyPacket     c)
            sa <- fmap join $ forM mc $ \c -> readTVar (contactLastSeenAddr  c)
            fr <- fmap join $ forM mc $ \c -> readTVar (contactFriendRequest c)
            cp <- fmap join $ forM mc $ \c -> readTVar (contactPolicy        c)
            return (kp,sa,fr,cp)
        case tup of
         (Nothing,Nothing,Nothing,Nothing) -> do
            dput XNetCrypto ("netCrypto: (" ++ show mykeyAsId ++") friend not found (" ++ show theirkeyAsId ++ ").")
            return []
         (mbKeyPkt,Nothing,mbFR,mbPolicy) -> do
            dput XNetCrypto ("netCrypto: (" ++ show mykeyAsId ++") no SockAddr for friend (" ++ show theirkeyAsId ++ "). TODO: search their node?")
            return []
         (Nothing,_,_,_) -> do
            dput XNetCrypto ("netCrypto: (" ++ show mykeyAsId ++") no DHT-key for friend (" ++ show theirkeyAsId ++ "). TODO: what?")
            return []
         (Just (stamp_theirDhtKey,keyPkt),Just (stamp_saddr,saddr),mbFR,mbPolicy)
                                  | theirDhtKey <- DHT.dhtpk keyPkt -> do
            -- Do we already have an active session with this user?
            sessionsMap <- atomically $ readTVar (netCryptoSessionsByKey (toxCryptoSessions tox) )
            let sessionUsesIdentity key session = key == ncMyPublicKey session
            case Map.lookup theirpubkey sessionsMap of
            -- if sessions found, is it using this private key?
              Just sessions | matchedSessions <- filter (sessionUsesIdentity (toPublic myseckey)) sessions
                            , not (null matchedSessions)
                            -> do
                dput XNetCrypto ("netCrypto: Already have a session for " ++ show mykeyAsId ++ "<-->" ++ show theirkeyAsId)
                return matchedSessions
            -- if not, send handshake, this is separate session
              _ -> do
                -- if no session:
                -- Convert to NodeInfo, so we can send cookieRequest
                let crypto = toxCryptoKeys tox
                    client = toxDHT tox
                case nodeInfo (key2id theirDhtKey) (nodeAddr saddr) of
                   Left e   -> dput XNetCrypto ("netCrypto: nodeInfo fail... " ++ e) >> return []
                   Right ni -> do
                    mbCookie <- DHT.cookieRequest crypto client (toPublic myseckey) ni
                    case mbCookie of
                      Nothing -> do
                        dput XNetCrypto ("netCrypto: (" ++ show mykeyAsId ++") <--> (" ++ show theirkeyAsId ++ ").")
                        dput XNetCrypto ("netCrypto: CookieRequest failed. TODO: dhtpkNodes thingy")
                        return []
                      Just cookie -> do
                        dput XNetCrypto "Have cookie, creating handshake packet..."
                        let hp = HParam { hpOtherCookie = cookie
                                        , hpMySecretKey = myseckey
                                        , hpCookieRemotePubkey = theirpubkey
                                        , hpCookieRemoteDhtkey = theirDhtKey
                                        , hpTheirBaseNonce = Nothing
                                        , hpTheirSessionKeyPublic = Nothing
                                        }
                        newsession <- generateSecretKey
                        timestamp <- getPOSIXTime
                        (myhandshake,ioAction)
                                <- atomically $ freshCryptoSession (toxCryptoSessions tox) (nodeAddr saddr) newsession timestamp hp
                        ioAction
                        -- send handshake
                        forM myhandshake $ \response_handshake -> do
                                sendHandshake (toxCryptoSessions tox) (nodeAddr saddr) response_handshake
                        let secnum :: Double
                            secnum = fromIntegral millisecs / 1000000
                            delay = (millisecs * 5 `div` 4)
                        if secnum < 20000000
                          then do
                            dput XNetCrypto $ "sent handshake, now delaying " ++ show (secnum * 1.25) ++ "  second(s).."
                            -- threadDelay delay
                            -- Commenting loop for simpler debugging
                            return [] -- netCryptoWithBackoff delay tox myseckey theirpubkey -- hopefully it will find an active session this time.
                          else do
                            dput XNetCrypto "Unable to establish session..."
                            return []

-- | Create a DHTPublicKey packet to send to a remote contact.
getContactInfo :: Tox extra -> IO DHT.DHTPublicKey
getContactInfo Tox{toxCryptoKeys,toxRouting} = join $ atomically $ do
    r4 <- readTVar $ DHT.routing4 toxRouting
    r6 <- readTVar $ DHT.routing6 toxRouting
    nonce <- transportNewNonce toxCryptoKeys
    let self = nodeId n4
        n4 = R.thisNode r4
        n6 = R.thisNode r6
        n4s = R.kclosest DHT.toxSpace 4 self r4
        n6s = R.kclosest DHT.toxSpace 4 self r6
        ns = filter (DHT.isGlobal . nodeIP) [n4,n6]
              ++ concat (zipWith (\a b -> [a,b]) n4s n6s)
    return $ do
        timestamp <- round . (* 1000000) <$> getPOSIXTime
        return DHT.DHTPublicKey
            { dhtpkNonce = timestamp
            , dhtpk      = id2key self
            , dhtpkNodes = DHT.SendNodes $ take 4 ns
            }

isLocalHost :: SockAddr -> Bool
isLocalHost (SockAddrInet _ host32) = (fromBE32 host32 == 0x7f000001)
isLocalHost _                       = False

addVerbosity :: Transport err SockAddr ByteString -> Transport err SockAddr ByteString
addVerbosity tr =
    tr { awaitMessage = \kont -> awaitMessage tr $ \m -> do
            forM_ m $ mapM_ $ \(msg,addr) -> do
                when (not (B.null msg || elem (B.head msg) [0,1,2,4,0x81,0x82,0x8c,0x8d])) $ do
                    mapM_ (\x -> dput XMisc ( (show addr) ++ " --> " ++ x))
                          $ xxd 0 msg
            kont m
       , sendMessage = \addr msg -> do
            when (not (B.null msg || elem (B.head msg) [0,1,2,4,0x81,0x8c,0x8d])) $ do
                mapM_ (\x -> dput XMisc ( (show addr) ++ " <-- " ++ x))
                      $ xxd 0 msg
            sendMessage tr addr msg
       }

newKeysDatabase :: IO (TVar Onion.AnnouncedKeys)
newKeysDatabase =
    atomically $ newTVar $ Onion.AnnouncedKeys PSQ.empty MinMaxPSQ.empty


getOnionAlias :: TransportCrypto -> STM NodeInfo -> Maybe (Onion.OnionDestination r) -> IO (Onion.OnionDestination r)
getOnionAlias crypto dhtself remoteNode = atomically $ do
    ni <- dhtself
    let alias = case remoteNode of
            Just (Onion.OnionDestination (Onion.AnnouncingAlias _ uk) _ _)
              -> ni { nodeId = key2id uk }
            _ -> ni { nodeId = key2id (onionAliasPublic crypto) }
    return $ Onion.OnionDestination Onion.SearchingAlias alias Nothing

mkDefaultDestroyHook :: ContactInfo extra -> NetCryptoSession -> IO ()
mkDefaultDestroyHook roster = \session -> do
   now <- getPOSIXTime
   r <- atomically $ do
           accounts <- readTVar (accounts roster) -- :: STM (HashMap NodeId (Account extra)
           let mbAccount = HashMap.lookup (key2id $ ncMyPublicKey session) accounts -- :: STM (Maybe (Account extra)
           case mbAccount of
            Just account -> do
                mp <- readTVar (netCryptoSessionsByKey (ncAllSessions session))
                case Map.lookup (ncTheirPublicKey session) mp of
                    Just sessionsWithThisPublicKey
                        | relevantSessions <- filter ((/=ncSessionId session) . ncSessionId) sessionsWithThisPublicKey
                        , not (null relevantSessions)
                        -> do
                     let showsession x = printf "%x" (ncSessionId x)
                     return . Left $ "Not calling setTerminated on " ++ show (key2id (ncTheirPublicKey session))
                                            ++" despite session(" ++ showsession session
                                            ++ ") failure. (Still have sessions: ["
                                            ++ Data.List.intercalate "," (map showsession relevantSessions)
                                            ++ "]"
                    _ -> Right <$> setTerminated now (ncTheirPublicKey session) account
            Nothing -> return . Left $ "(defaultDestroyHook) their is no account! pubkey=" ++ show (key2id (ncTheirPublicKey session))
   case r of
    Left msg -> dput XMan msg
    _ -> return ()

newTox :: TVar Onion.AnnouncedKeys   -- ^ Store of announced keys we are a rendezvous for.
       -> SockAddr                   -- ^ Bind-address to listen on.
       -> Maybe NetCryptoSessions    -- ^ State of all one-on-one Tox links.
       -> Maybe SecretKey            -- ^ Optional DHT secret key to use.
       -> IO (Tox extra)
newTox keydb addr mbSessionsState suppliedDHTKey = do
    (udp,sock) <- {- addVerbosity <$> -} udpTransport' addr
    tox <- newToxOverTransport keydb addr mbSessionsState suppliedDHTKey udp
    return tox { toxAnnounceToLan = announceToLan sock (key2id $ transportPublic $ toxCryptoKeys tox) }

-- | This version of 'newTox' is useful for automated tests using 'testPairTransport'.
newToxOverTransport :: TVar Onion.AnnouncedKeys
        -> SockAddr
        -> Maybe NetCryptoSessions
        -> Maybe SecretKey
        -> Onion.UDPTransport
        -> IO (Tox extra)
newToxOverTransport keydb addr mbSessionsState suppliedDHTKey udp = do
    roster <- newContactInfo
    (crypto0,sessionsState0) <- case mbSessionsState of
                                 Nothing -> do
                                    crypto <- newCrypto
                                    sessionsState <- newSessionsState crypto (mkDefaultDestroyHook roster) defaultUnRecHook defaultCryptoDataHooks
                                    return (crypto,sessionsState)
                                 Just s -> do
                                    let oldhook = defaultDestroyHook s
                                        oldhook' = filter ((==0) . fst) oldhook
                                        newhook = (0,mkDefaultDestroyHook roster):oldhook'
                                    return (transportCrypto s, s { defaultDestroyHook = newhook})

    let -- patch in supplied DHT key
        crypto1 = fromMaybe crypto0 $do
            k <- suppliedDHTKey
            return crypto0
                { transportSecret = k
                , transportPublic = toPublic k
                }
        -- patch in newly allocated roster state.
        crypto = crypto1 { userKeys = myKeyPairs roster }
    forM_ suppliedDHTKey $ \k -> do
        maybe (dput XMisc "failed to encode suppliedDHTKey")
              (dputB XMisc . C8.append "Using suppliedDHTKey: ")
              $ encodeSecret k

    drg <- drgNew
    let lookupClose _ = return Nothing

    mkrouting <- DHT.newRouting addr crypto updateIP updateIP
    orouter <- newOnionRouter $ dput XRoutes
    (cryptonet,dhtcrypt,onioncrypt,dtacrypt,handshakes) <- toxTransport crypto orouter lookupClose udp

    let dhtnet0 = layerTransportM (DHT.decrypt crypto) (DHT.encrypt crypto) dhtcrypt
        tbl4 = DHT.routing4 $ mkrouting (error "missing client")
        tbl6 = DHT.routing6 $ mkrouting (error "missing client")
    dhtclient <- newClient drg dhtnet0 DHT.classify (myAddr tbl4 tbl6) (DHT.handlers crypto . mkrouting) id
                    $ \client net -> onInbound (DHT.updateRouting client (mkrouting client) orouter) net
    -- TODO: Refactor so this recursive do is unnecessary.
    rec (mgr,sessionsState) <- do
        mgr <- toxManager (Parameters { dhtRouting   = mkrouting dhtclient
                                      , roster       = roster
                                      , sessions     = sessionsState
                                      , dhtClient    = dhtclient
                                      , onToxSession = return () -- TODO
                                      })
        let policylookup key = do
                mp <- connections mgr
                case Map.lookup key mp of
                    Nothing -> return OpenToConnect
                    Just conn -> Connection.connPolicy conn

        return (mgr, sessionsState0 { sendHandshake     = sendMessage handshakes
                                    , sendSessionPacket = sendMessage cryptonet
                                    , transportCrypto   = crypto
                                    , netCryptoPolicyByKey = policylookup
                                    })

    orouter' <- forkRouteBuilder orouter
        $ \nid ni -> fmap (\(_,ns,_)->ns)
                     <$> DHT.getNodes dhtclient (DHT.nodesOfInterest $ mkrouting dhtclient) nid ni

    toks <- do
        nil <- nullSessionTokens
        atomically $ newTVar nil { maxInterval = 20 } -- 20 second timeout on announce ping-ids.
    oniondrg <- drgNew
    let onionnet = layerTransportM (Onion.decrypt crypto) (Onion.encrypt crypto) onioncrypt
    onionclient <- newClient oniondrg onionnet (const Onion.classify)
                    (getOnionAlias crypto $ R.thisNode <$> readTVar (DHT.routing4 $ mkrouting dhtclient))
                    (const $ Onion.handlers onionnet (mkrouting dhtclient) toks keydb)
                    (hookQueries orouter' DHT.transactionKey)
                    (const id)

    return Tox
        { toxDHT            = dhtclient
        , toxOnion          = onionclient
        , toxToRoute        = onInbound (updateContactInfo roster) dtacrypt
        , toxCrypto         = addHandler (dput XMisc) (sessionPacketH sessionsState) cryptonet
        , toxHandshakes     = addHandler (dput XMisc) (handshakeH     sessionsState) handshakes
        , toxCryptoSessions = sessionsState
        , toxCryptoKeys     = crypto
        , toxRouting        = mkrouting dhtclient
        , toxTokens         = toks
        , toxAnnouncedKeys  = keydb
        , toxOnionRoutes    = orouter
        , toxContactInfo    = roster
        , toxAnnounceToLan  = return ()
        , toxMgr            = mgr
        }

onionTimeout :: Tox extra -> DHT.TransactionId -> Onion.OnionDestination RouteId -> STM (Onion.OnionDestination RouteId, Int)
onionTimeout Tox { toxOnionRoutes = or } (DHT.TransactionId n8 _) od = lookupTimeout or n8 od

routing4nodeInfo :: DHT.Routing -> IO NodeInfo
routing4nodeInfo (DHT.routing4 -> tv) = R.thisNode <$> readTVarIO tv

dnssdAnnounce :: Tox extra -> IO ()
dnssdAnnounce tox = do
  ni   <- routing4nodeInfo (toxRouting tox)
  keys <- fmap (key2id . snd) <$> atomically (userKeys $ toxCryptoKeys tox)
  announceToxService (nodePort ni) (nodeId ni) (listToMaybe keys)

dnssdDiscover :: Tox extra -> NodeInfo -> (Maybe NodeId) -> IO ()
dnssdDiscover tox ni toxid = do
  acts <- atomically $ readTVar $ accounts $ toxContactInfo tox
  now  <- getPOSIXTime
  forM toxid $ \tid ->
    forM acts $ \act ->
      atomically $ setContactAddr now (id2key tid) ni act

  void $ DHT.ping (toxDHT tox) ni

forkTox :: Tox extra -> Bool -> IO (IO (), [NodeInfo] -> [NodeInfo] -> IO (), [NodeInfo] -> [NodeInfo] -> IO ())
forkTox tox with_avahi = do
    quitHs      <- forkListener "toxHandshakes" (toxHandshakes tox)
    quitToRoute <- forkListener "toxToRoute" (toxToRoute tox)
    quitOnion   <- forkListener "toxOnion" (clientNet $ toxOnion tox)
    quitDHT     <- forkListener "toxDHT" (clientNet $ toxDHT tox)
    quitNC      <- forkListener "toxCrypto" (toxCrypto tox)
    quitAvahi <- if with_avahi then do
                    forkPollForRefresh (DHT.refresher4 $ toxRouting tox)
                    forkPollForRefresh (DHT.refresher6 $ toxRouting tox)
                    dnssdIn <- forkIO $ queryToxService (dnssdDiscover tox)
                    dnssdOut <- forkIO $ dnssdAnnounce tox
                    labelThread dnssdIn  "tox-avahi-monitor"
                    labelThread dnssdOut "tox-avahi-publish"
                    return $ forM_ [dnssdIn,dnssdOut] killThread
                 else return $ return ()
    keygc <- Onion.forkAnnouncedKeysGC (toxAnnouncedKeys tox)
    return ( do quitAvahi
                killThread keygc
                quitNC
                quitDHT
                quitOnion
                quitToRoute
                quitHs
           , bootstrap (DHT.refresher4 $ toxRouting tox)
           , bootstrap (DHT.refresher6 $ toxRouting tox)
           )

-- TODO: Don't export this.  The exported interface is 'toxAnnounceToLan'.
announceToLan :: Socket -> NodeId -> IO ()
announceToLan sock nid = do
    addrs <- broadcastAddrs
    forM_ addrs $ \addr -> do
    (broadcast_info:_) <- getAddrInfo (Just defaultHints { addrFlags = [AI_NUMERICHOST], addrSocketType = Datagram })
                                      (Just addr)
                                      (Just "33445")
    let broadcast = addrAddress broadcast_info
        bs = S.runPut $ DHT.putMessage (DHT.DHTLanDiscovery nid)
    saferSendTo sock bs broadcast