netserver/hedgewars-server.hs
author unc0rr
Fri, 07 Nov 2008 15:58:36 +0000
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child 1480 aec44e91f2d1
permissions -rw-r--r--
Add simple DoS protection
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module Main where
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import Network
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import IO
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import System.IO
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import Control.Concurrent
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import Control.Concurrent.STM
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import Control.Exception (setUncaughtExceptionHandler, handle, finally)
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import Control.Monad
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import Maybe (fromMaybe, isJust, fromJust)
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import Data.List
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import Miscutils
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import HWProto
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import Opts
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import Data.Time
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#if !defined(mingw32_HOST_OS)
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import System.Posix
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#endif
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data Messages =
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	Accept ClientInfo
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	| ClientMessage ([String], ClientInfo)
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	| CoreMessage [String]
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messagesLoop :: TChan [String] -> IO()
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messagesLoop messagesChan = forever $ do
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	threadDelay (30 * 10^6) -- 30 seconds
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	atomically $ writeTChan messagesChan ["PING"]
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acceptLoop :: Socket -> TChan ClientInfo -> IO ()
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acceptLoop servSock acceptChan = Control.Exception.handle (const $ putStrLn "exception on connect" >> acceptLoop servSock acceptChan) $ do
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	(cHandle, host, _) <- accept servSock
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	putStrLn $ "new client: " ++ host
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	currentTime <- getCurrentTime
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	cChan <- atomically newTChan
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	forkIO $ clientLoop cHandle cChan
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	atomically $ writeTChan acceptChan (ClientInfo cChan cHandle host currentTime"" 0 "" False False False)
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	atomically $ writeTChan cChan ["ASKME"]
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	acceptLoop servSock acceptChan
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listenLoop :: Handle -> [String] -> TChan [String] -> IO ()
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listenLoop handle buf chan = do
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	str <- hGetLine handle
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	if str == "" then do
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		atomically $ writeTChan chan buf
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		listenLoop handle [] chan
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		else
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		listenLoop handle (buf ++ [str]) chan
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clientLoop :: Handle -> TChan [String] -> IO ()
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clientLoop handle chan =
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	listenLoop handle [] chan
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		`catch` (\e -> (clientOff $ show e) >> return ())
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	where clientOff msg = atomically $ writeTChan chan ["QUIT", msg] -- if the client disconnects, we perform as if it sent QUIT message
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sendAnswers [] _ clients _ = return clients
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sendAnswers ((handlesFunc, answer):answers) client clients rooms = do
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	let recipients = handlesFunc client clients rooms
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	--unless (null recipients) $ putStrLn ("< " ++ (show answer))
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	when (head answer == "NICK") $ putStrLn (show answer)
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	clHandles' <- forM recipients $
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		\ch -> Control.Exception.handle
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			(\e -> if head answer == "BYE" then
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					return [ch]
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				else
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					atomically $ writeTChan (chan $ fromJust $ clientByHandle ch clients) ["QUIT", show e] >> return []  -- cannot just remove
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			) $
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			do
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			forM_ answer (\str -> hPutStrLn ch str)
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			hPutStrLn ch ""
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			hFlush ch
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			if head answer == "BYE" then return [ch] else return []
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	let outHandles = concat clHandles'
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	unless (null outHandles) $ putStrLn ((show $ length outHandles) ++ " / " ++ (show $ length clients) ++ " : " ++ (show answer))
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	mapM_ (\ch -> Control.Exception.handle (const $ putStrLn "error on hClose") (hClose ch)) outHandles
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	let mclients = remove clients outHandles
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	sendAnswers answers client mclients rooms
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	where
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		remove list rmClHandles = deleteFirstsBy2t (\ a b -> (Miscutils.handle a) == b) list rmClHandles
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reactCmd :: [String] -> ClientInfo -> [ClientInfo] -> [RoomInfo] -> IO ([ClientInfo], [RoomInfo])
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reactCmd cmd client clients rooms = do
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	--putStrLn ("> " ++ show cmd)
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	let (clientsFunc, roomsFunc, answers) = handleCmd client clients rooms $ cmd
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	let mrooms = roomsFunc rooms
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	let mclients = (clientsFunc clients)
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	let mclient = fromMaybe client $ find (== client) mclients
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	clientsIn <- sendAnswers answers mclient mclients mrooms
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	let quitClient = find forceQuit $ clientsIn
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	if isJust quitClient then
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		reactCmd ["QUIT", "Kicked"] (fromJust quitClient) clientsIn mrooms
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		else
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		return (clientsIn, mrooms)
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mainLoop :: Socket -> TChan ClientInfo -> TChan [String] -> [ClientInfo] -> [RoomInfo] -> IO ()
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mainLoop servSock acceptChan messagesChan clients rooms = do
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	r <- atomically $
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		(Accept `fmap` readTChan acceptChan) `orElse`
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		(ClientMessage `fmap` tselect clients) `orElse`
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		(CoreMessage `fmap` readTChan messagesChan)
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	case r of
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		Accept ci -> do
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			let sameHostClients = filter (\cl -> host ci == host cl) clients
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			let haveJustConnected = not $ null $ filter (\cl -> diffUTCTime (connectTime ci) (connectTime cl) <= 5) sameHostClients
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			when haveJustConnected $ do
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				atomically $ writeTChan (chan ci) ["QUIT", "Reconnected too fast"]
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				mainLoop servSock acceptChan messagesChan (clients ++ [ci]) rooms
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			mainLoop servSock acceptChan messagesChan (clients ++ [ci]) rooms
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		ClientMessage (cmd, client) -> do
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			(clientsIn, mrooms) <- reactCmd cmd client clients rooms
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			let hadRooms = (not $ null rooms) && (null mrooms)
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				in unless ((not $ isDedicated globalOptions) && ((null clientsIn) || hadRooms)) $
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					mainLoop servSock acceptChan messagesChan clientsIn mrooms
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		CoreMessage msg ->
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			if not $ null $ clients then
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				do
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				let client = head clients -- don't care
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				(clientsIn, mrooms) <- reactCmd msg client clients rooms
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				mainLoop servSock acceptChan messagesChan clientsIn mrooms
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			else
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				mainLoop servSock acceptChan messagesChan clients rooms
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startServer serverSocket = do
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	acceptChan <- atomically newTChan
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	forkIO $ acceptLoop serverSocket acceptChan
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	messagesChan <- atomically newTChan
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	forkIO $ messagesLoop messagesChan
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	mainLoop serverSocket acceptChan messagesChan [] []
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main = withSocketsDo $ do
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#if !defined(mingw32_HOST_OS)
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	installHandler sigPIPE Ignore Nothing;
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#endif
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	putStrLn $ "Listening on port " ++ show (listenPort globalOptions)
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	serverSocket <- listenOn $ PortNumber (listenPort globalOptions)
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	startServer serverSocket `finally` sClose serverSocket