@@ -1,113 +1,168 @@
1+{-# LANGUAGE BangPatterns #-}
12{-# LANGUAGE CPP #-}
23{-# LANGUAGE OverloadedStrings #-}
4+{-# LANGUAGE PackageImports #-}
5+{-# LANGUAGE PatternGuards #-}
6+{-# LANGUAGE RecordWildCards #-}
37{-# LANGUAGE ScopedTypeVariables #-}
48{-# LANGUAGE TupleSections #-}
9+{-# LANGUAGE ViewPatterns #-}
510{-# OPTIONS_GHC -fno-warn-deprecations #-}
611
712module Network.Wai.Handler.Warp.Run where
813
9−import Control.Concurrent (threadDelay, forkIOWithUnmask)
14+import "iproute" Data.IP (toHostAddress, toHostAddress6)
15+import Control.Arrow (first)
1016import qualified Control.Concurrent as Conc (yield)
1117import Control.Exception as E
12−import Control.Monad (forever, when, unless, void)
13−import Control.Monad.IO.Class (liftIO)
14−import Data.ByteString (ByteString)
1518import qualified Data.ByteString as S
19+import Data.Char (chr)
20+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
1621import Data.Streaming.Network (bindPortTCP)
17−import Network (sClose, Socket)
18−import Network.Socket (accept, SockAddr)
22+import Foreign.C.Error (Errno(..), eCONNABORTED)
23+import GHC.IO.Exception (IOException(..))
24+import qualified Network.HTTP2 as H2
25+import Network.Socket (Socket, close, accept, withSocketsDo, SockAddr(SockAddrInet, SockAddrInet6), setSocketOption, SocketOption(..))
26+#if MIN_VERSION_network(3,1,1)
27+import Network.Socket (gracefulClose)
28+#endif
1929import qualified Network.Socket.ByteString as Sock
2030import Network.Wai
31+import Network.Wai.Internal (ResponseReceived (ResponseReceived))
32+import System.Environment (lookupEnv)
33+import qualified System.TimeManager as T
34+import System.Timeout (timeout)
35+
36+import Network.Wai.Handler.Warp.Buffer
37+import Network.Wai.Handler.Warp.Counter
2138import qualified Network.Wai.Handler.Warp.Date as D
2239import qualified Network.Wai.Handler.Warp.FdCache as F
23−import Network.Wai.Handler.Warp.Buffer
40+import qualified Network.Wai.Handler.Warp.FileInfoCache as I
41+import Network.Wai.Handler.Warp.HTTP2 (http2)
42+import Network.Wai.Handler.Warp.HTTP2.Types (isHTTP2)
2443import Network.Wai.Handler.Warp.Header
44+import Network.Wai.Handler.Warp.Imports hiding (readInt)
45+import Network.Wai.Handler.Warp.ReadInt
2546import Network.Wai.Handler.Warp.Recv
2647import Network.Wai.Handler.Warp.Request
2748import Network.Wai.Handler.Warp.Response
2849import Network.Wai.Handler.Warp.SendFile
2950import Network.Wai.Handler.Warp.Settings
30−import qualified Network.Wai.Handler.Warp.Timeout as T
3151import Network.Wai.Handler.Warp.Types
32−import Data.IORef (IORef, newIORef, readIORef, writeIORef)
52+
3353
3454#if WINDOWS
35−import qualified Control.Concurrent.MVar as MV
36−import Network.Socket (withSocketsDo)
37−import Control.Concurrent (forkIO)
55+import Network.Wai.Handler.Warp.Windows
3856#else
39−import System.Posix.IO (FdOption(CloseOnExec), setFdOption)
4057import Network.Socket (fdSocket)
4158#endif
4259
43−-- | Default action value for 'Connection'.
44−socketConnection :: Socket -> IO Connection
45−socketConnection s = do
46− buf <- allocateBuffer bufferSize
60+-- | Creating 'Connection' for plain HTTP based on a given socket.
61+socketConnection :: Settings -> Socket -> IO Connection
62+#if MIN_VERSION_network(3,1,1)
63+socketConnection set s = do
64+#else
65+socketConnection _ s = do
66+#endif
67+ bufferPool <- newBufferPool
68+ writeBuf <- allocateBuffer bufferSize
69+ let sendall = Sock.sendAll s
70+ isH2 <- newIORef False -- HTTP/1.x
4771 return Connection {
4872 connSendMany = Sock.sendMany s
49− , connSendAll = Sock.sendAll s
50− , connSendFile = defaultSendFile s
51− , connClose = sClose s >> freeBuffer buf
52− , connRecv = receive s buf bufferSize
53− , connBuffer = buf
73+ , connSendAll = sendall
74+ , connSendFile = sendFile s writeBuf bufferSize sendall
75+#if MIN_VERSION_network(3,1,1)
76+ , connClose = do
77+ h2 <- readIORef isH2
78+ let tm = if h2 then settingsGracefulCloseTimeout2 set
79+ else settingsGracefulCloseTimeout1 set
80+ if tm == 0 then
81+ close s
82+ else
83+ gracefulClose s tm `E.catch` \(E.SomeException _) -> return ()
84+#else
85+ , connClose = close s
86+#endif
87+ , connFree = freeBuffer writeBuf
88+ , connRecv = receive s bufferPool
89+ , connRecvBuf = receiveBuf s
90+ , connWriteBuffer = writeBuf
5491 , connBufferSize = bufferSize
55− , connSendFileOverride = Override s
92+ , connHTTP2 = isH2
5693 }
5794
58−#if __GLASGOW_HASKELL__ < 702
59−allowInterrupt :: IO ()
60−allowInterrupt = unblock $ return ()
61−#endif
62−
63−-- | Run an 'Application' on the given port. This calls 'runSettings' with
64−-- 'defaultSettings'.
95+-- | Run an 'Application' on the given port.
96+-- This calls 'runSettings' with 'defaultSettings'.
6597run :: Port -> Application -> IO ()
6698run p = runSettings defaultSettings { settingsPort = p }
6799
100+-- | Run an 'Application' on the port present in the @PORT@
101+-- environment variable. Uses the 'Port' given when the variable is unset.
102+-- This calls 'runSettings' with 'defaultSettings'.
103+--
104+-- Since 3.0.9
105+runEnv :: Port -> Application -> IO ()
106+runEnv p app = do
107+ mp <- lookupEnv "PORT"
108+
109+ maybe (run p app) runReadPort mp
110+
111+ where
112+ runReadPort :: String -> IO ()
113+ runReadPort sp = case reads sp of
114+ ((p', _):_) -> run p' app
115+ _ -> fail $ "Invalid value in $PORT: " ++ sp
116+
68117-- | Run an 'Application' with the given 'Settings'.
118+-- This opens a listen socket on the port defined in 'Settings' and
119+-- calls 'runSettingsSocket'.
69120runSettings :: Settings -> Application -> IO ()
70−#if WINDOWS
71−runSettings set app = withSocketsDo $ do
72− var <- MV.newMVar Nothing
73− let clean = MV.modifyMVar_ var $ \s -> maybe (return ()) sClose s >> return Nothing
74− void . forkIO $ bracket
75− (bindPortTCP (settingsPort set) (settingsHost set))
76− (const clean)
77− (\s -> do
78− MV.modifyMVar_ var (\_ -> return $ Just s)
79− runSettingsSocket set s app)
80− forever (threadDelay maxBound) `finally` clean
81−#else
82−runSettings set app =
121+runSettings set app = withSocketsDo $
83122 bracket
84123 (bindPortTCP (settingsPort set) (settingsHost set))
85− sClose
124+ close
86125 (\socket -> do
87126 setSocketCloseOnExec socket
88127 runSettingsSocket set socket app)
89−#endif
90128
91−-- | Same as 'runSettings', but uses a user-supplied socket instead of opening
92−-- one. This allows the user to provide, for example, Unix named socket, which
129+-- | This installs a shutdown handler for the given socket and
130+-- calls 'runSettingsConnection' with the default connection setup action
131+-- which handles plain (non-cipher) HTTP.
132+-- When the listen socket in the second argument is closed, all live
133+-- connections are gracefully shut down.
134+--
135+-- The supplied socket can be a Unix named socket, which
93136-- can be used when reverse HTTP proxying into your application.
94137--
95138-- Note that the 'settingsPort' will still be passed to 'Application's via the
96139-- 'serverPort' record.
97140runSettingsSocket :: Settings -> Socket -> Application -> IO ()
98−runSettingsSocket set socket app =
141+runSettingsSocket set socket app = do
142+ settingsInstallShutdownHandler set closeListenSocket
99143 runSettingsConnection set getConn app
100144 where
101145 getConn = do
146+#if WINDOWS
147+ (s, sa) <- windowsThreadBlockHack $ accept socket
148+#else
102149 (s, sa) <- accept socket
150+#endif
103151 setSocketCloseOnExec s
104− conn <- socketConnection s
152+ -- NoDelay causes an error for AF_UNIX.
153+ setSocketOption s NoDelay 1 `E.catch` \(E.SomeException _) -> return ()
154+ conn <- socketConnection set s
105155 return (conn, sa)
106156
107−-- | Allows you to provide a function which will return a 'Connection'. In
108−-- cases where creating the @Connection@ can be expensive, this allows the
109−-- expensive computations to be performed in a separate thread instead of the
110−-- main server loop.
157+ closeListenSocket = close socket
158+
159+-- | The connection setup action would be expensive. A good example
160+-- is initialization of TLS.
161+-- So, this converts the connection setup action to the connection maker
162+-- which will be executed after forking a new worker thread.
163+-- Then this calls 'runSettingsConnectionMaker' with the connection maker.
164+-- This allows the expensive computations to be performed
165+-- in a separate worker thread instead of the main server loop.
111166--
112167-- Since 1.3.5
113168runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()
@@ -117,189 +172,428 @@ runSettingsConnection set getConn app = runSettingsConnectionMaker set getConnMa
117172 (conn, sa) <- getConn
118173 return (return conn, sa)
119174
175+-- | This modifies the connection maker so that it returns 'TCP' for 'Transport'
176+-- (i.e. plain HTTP) then calls 'runSettingsConnectionMakerSecure'.
120177runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()
121178runSettingsConnectionMaker x y =
122− runSettingsConnectionMakerSecure x (go y)
179+ runSettingsConnectionMakerSecure x (toTCP <$> y)
123180 where
124− go = fmap (\(a, b) -> (fmap (, False) a, b))
181+ toTCP = first ((, TCP) <$>)
182+
183+----------------------------------------------------------------
125184
126−-- | Allows you to provide a function which will return a function
127−-- which will return 'Connection'.
185+-- | The core run function which takes 'Settings',
186+-- a connection maker and 'Application'.
187+-- The connection maker can return a connection of either plain HTTP
188+-- or HTTP over TLS.
128189--
129190-- Since 2.1.4
130−runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Bool), SockAddr) -> Application -> IO ()
191+runSettingsConnectionMakerSecure :: Settings -> IO (IO (Connection, Transport), SockAddr) -> Application -> IO ()
131192runSettingsConnectionMakerSecure set getConnMaker app = do
132193 settingsBeforeMainLoop set
194+ counter <- newCounter
195+ withII $ acceptConnection set getConnMaker app counter
196+ where
197+ withII action =
198+ withTimeoutManager $ \tm ->
199+ D.withDateCache $ \dc ->
200+ F.withFdCache fdCacheDurationInSeconds $ \fdc ->
201+ I.withFileInfoCache fdFileInfoDurationInSeconds $ \fic -> do
202+ let ii = InternalInfo tm dc fdc fic
203+ action ii
133204
134− -- Note that there is a thorough discussion of the exception safety of the
135− -- following code at: https://github.com/yesodweb/wai/issues/146
136− --
137− -- We need to make sure of two things:
138− --
139− -- 1. Asynchronous exceptions are not blocked entirely in the main loop.
140− -- Doing so would make it impossible to kill the Warp thread.
141− --
142− -- 2. Once a connection maker is received via getConnLoop, the connection
143− -- is guaranteed to be closed, even in the presence of async exceptions.
205+ !fdCacheDurationInSeconds = settingsFdCacheDuration set * 1000000
206+ !fdFileInfoDurationInSeconds = settingsFileInfoCacheDuration set * 1000000
207+ !timeoutInSeconds = settingsTimeout set * 1000000
208+ withTimeoutManager f = case settingsManager set of
209+ Just tm -> f tm
210+ Nothing -> bracket
211+ (T.initialize timeoutInSeconds)
212+ T.stopManager
213+ f
214+
215+-- Note that there is a thorough discussion of the exception safety of the
216+-- following code at: https://github.com/yesodweb/wai/issues/146
217+--
218+-- We need to make sure of two things:
219+--
220+-- 1. Asynchronous exceptions are not blocked entirely in the main loop.
221+-- Doing so would make it impossible to kill the Warp thread.
222+--
223+-- 2. Once a connection maker is received via acceptNewConnection, the
224+-- connection is guaranteed to be closed, even in the presence of
225+-- async exceptions.
226+--
227+-- Our approach is explained in the comments below.
228+acceptConnection :: Settings
229+ -> IO (IO (Connection, Transport), SockAddr)
230+ -> Application
231+ -> Counter
232+ -> InternalInfo
233+ -> IO ()
234+acceptConnection set getConnMaker app counter ii = do
235+ -- First mask all exceptions in acceptLoop. This is necessary to
236+ -- ensure that no async exception is throw between the call to
237+ -- acceptNewConnection and the registering of connClose.
144238 --
145− -- Our approach is explained in the comments below.
146−
147− -- First mask all exceptions in the main loop. This is necessary to ensure
148− -- that no async exception is throw between the call to getConnLoop and the
149− -- registering of connClose.
150− D.withDateCache $ \dc -> do
151− F.withFdCache (settingsFdCacheDuration set * 1000000) $ \fc -> do
152− withTimeoutManager $ \tm -> mask_ . forever $ do
239+ -- acceptLoop can be broken by closing the listing socket.
240+ void $ mask_ acceptLoop
241+ -- In some cases, we want to stop Warp here without graceful shutdown.
242+ -- So, async exceptions are allowed here.
243+ -- That's why `finally` is not used.
244+ gracefulShutdown set counter
245+ where
246+ acceptLoop = do
153247 -- Allow async exceptions before receiving the next connection maker.
154248 allowInterrupt
155249
156− -- getConnLoop will try to receive the next incoming request. It
157− -- returns a /connection maker/, not a connection, since in some
158− -- circumstances creating a working connection from a raw socket may be
159− -- an expensive operation, and this expensive work should not be
160− -- performed in the main event loop. An example of something expensive
161− -- would be TLS negotiation.
162− (mkConn, addr) <- getConnLoop
250+ -- acceptNewConnection will try to receive the next incoming
251+ -- request. It returns a /connection maker/, not a connection,
252+ -- since in some circumstances creating a working connection
253+ -- from a raw socket may be an expensive operation, and this
254+ -- expensive work should not be performed in the main event
255+ -- loop. An example of something expensive would be TLS
256+ -- negotiation.
257+ mx <- acceptNewConnection
258+ case mx of
259+ Nothing -> return ()
260+ Just (mkConn, addr) -> do
261+ fork set mkConn addr app counter ii
262+ acceptLoop
263+
264+ acceptNewConnection = do
265+ ex <- try getConnMaker
266+ case ex of
267+ Right x -> return $ Just x
268+ Left e -> do
269+ let eConnAborted = getErrno eCONNABORTED
270+ getErrno (Errno cInt) = cInt
271+ if ioe_errno e == Just eConnAborted
272+ then acceptNewConnection
273+ else do
274+ settingsOnException set Nothing $ toException e
275+ return Nothing
163276
164− -- Fork a new worker thread for this connection maker, and ask for a
165− -- function to unmask (i.e., allow async exceptions to be thrown).
277+-- Fork a new worker thread for this connection maker, and ask for a
278+-- function to unmask (i.e., allow async exceptions to be thrown).
279+fork :: Settings
280+ -> IO (Connection, Transport)
281+ -> SockAddr
282+ -> Application
283+ -> Counter
284+ -> InternalInfo
285+ -> IO ()
286+fork set mkConn addr app counter ii = settingsFork set $ \unmask ->
287+ -- Call the user-supplied on exception code if any
288+ -- exceptions are thrown.
289+ handle (settingsOnException set Nothing) $
290+ -- Run the connection maker to get a new connection, and ensure
291+ -- that the connection is closed. If the mkConn call throws an
292+ -- exception, we will leak the connection. If the mkConn call is
293+ -- vulnerable to attacks (e.g., Slowloris), we do nothing to
294+ -- protect the server. It is therefore vital that mkConn is well
295+ -- vetted.
166296 --
167− -- GHC 7.8 cannot infer the type of "void . forkIOWithUnmask"
168− void $ forkIOWithUnmask $ \unmask ->
169− -- Run the connection maker to get a new connection, and ensure
170− -- that the connection is closed. If the mkConn call throws an
171− -- exception, we will leak the connection. If the mkConn call is
172− -- vulnerable to attacks (e.g., Slowloris), we do nothing to
173− -- protect the server. It is therefore vital that mkConn is well
174− -- vetted.
175− --
176− -- We grab the connection before registering timeouts since the
177− -- timeouts will be useless during connection creation, due to the
178− -- fact that async exceptions are still masked.
179− bracket mkConn (connClose . fst) $ \(conn', isSecure') ->
180−
181− -- We need to register a timeout handler for this thread, and
182− -- cancel that handler as soon as we exit.
183− bracket (T.registerKillThread tm) T.cancel $ \th ->
184− let ii = InternalInfo th fc dc
185− conn = setSendFile conn' fc
186− -- We now have fully registered a connection close handler
187− -- in the case of all exceptions, so it is safe to one
188− -- again allow async exceptions.
189− in unmask .
190− -- Call the user-supplied on exception code if any
191− -- exceptions are thrown.
192− handle (onE Nothing) .
193−
194− -- Call the user-supplied code for connection open and close events
195− bracket (onOpen addr) (const $ onClose addr) $ \goingon ->
196−
197− -- Actually serve this connection.
198− -- onnClose above ensures the termination of the connection.
199− when goingon $ serveConnection conn ii addr isSecure' set app
297+ -- We grab the connection before registering timeouts since the
298+ -- timeouts will be useless during connection creation, due to the
299+ -- fact that async exceptions are still masked.
300+ bracket mkConn cleanUp (serve unmask)
200301 where
201− -- FIXME: only IOEception is caught. What about other exceptions?
202− getConnLoop = getConnMaker `E.catch` \(e :: IOException) -> do
203− onE Nothing (toException e)
204− -- "resource exhausted (Too many open files)" may happen by accept().
205− -- Wait a second hoping that resource will be available.
206− threadDelay 1000000
207− getConnLoop
208− onE mreq e =
209− case fromException e of
210− Just (NotEnoughLines []) -> return ()
211− _ -> settingsOnException set mreq e
212− onOpen = settingsOnOpen set
213− onClose = settingsOnClose set
214−
215− withTimeoutManager f =
216− case settingsManager set of
217− Nothing -> bracket
218− (T.initialize $ settingsTimeout set * 1000000)
219− T.stopManager
220− f
221− Just tm -> f tm
302+ cleanUp (conn, _) = connClose conn `finally` connFree conn
303+
304+ -- We need to register a timeout handler for this thread, and
305+ -- cancel that handler as soon as we exit.
306+ serve unmask (conn, transport) = bracket register cancel $ \th -> do
307+ -- We now have fully registered a connection close handler in
308+ -- the case of all exceptions, so it is safe to once again
309+ -- allow async exceptions.
310+ unmask .
311+ -- Call the user-supplied code for connection open and
312+ -- close events
313+ bracket (onOpen addr) (onClose addr) $ \goingon ->
314+ -- Actually serve this connection. bracket with closeConn
315+ -- above ensures the connection is closed.
316+ when goingon $ serveConnection conn ii th addr transport set app
317+ where
318+ register = T.registerKillThread (timeoutManager ii) (connClose conn)
319+ cancel = T.cancel
320+
321+ onOpen adr = increase counter >> settingsOnOpen set adr
322+ onClose adr _ = decrease counter >> settingsOnClose set adr
222323
223324serveConnection :: Connection
224325 -> InternalInfo
326+ -> T.Handle
225327 -> SockAddr
226− -> Bool -- ^ is secure?
328+ -> Transport
227329 -> Settings
228330 -> Application
229331 -> IO ()
230−serveConnection conn ii addr isSecure' settings app = do
332+serveConnection conn ii th origAddr transport settings app = do
333+ -- fixme: Upgrading to HTTP/2 should be supported.
334+ (h2,bs) <- if isHTTP2 transport then
335+ return (True, "")
336+ else do
337+ bs0 <- connRecv conn
338+ if S.length bs0 >= 4 && "PRI " `S.isPrefixOf` bs0 then
339+ return (True, bs0)
340+ else
341+ return (False, bs0)
231342 istatus <- newIORef False
232− src <- mkSource (connSource conn th istatus)
233− recvSendLoop istatus src `E.catch` \e -> do
234− sendErrorResponse istatus e
235− throwIO (e :: SomeException)
343+ if settingsHTTP2Enabled settings && h2 then do
344+ rawRecvN <- makeReceiveN bs (connRecv conn) (connRecvBuf conn)
345+ -- This thread becomes the sender in http2 library.
346+ -- In the case of event source, one request comes and one
347+ -- worker gets busy. But it is likely that the receiver does
348+ -- not receive any data at all while the sender is sending
349+ -- output data from the worker. It's not good enough to tickle
350+ -- the time handler in the receiver only. So, we should tickle
351+ -- the time handler in both the receiver and the sender.
352+ let recvN = wrappedRecvN th istatus (settingsSlowlorisSize settings) rawRecvN
353+ sendBS x = connSendAll conn x >> T.tickle th
354+ -- fixme: origAddr
355+ checkTLS
356+ setConnHTTP2 conn True
357+ http2 conn transport ii origAddr settings recvN sendBS app
358+ else do
359+ src <- mkSource (wrappedRecv conn th istatus (settingsSlowlorisSize settings))
360+ writeIORef istatus True
361+ leftoverSource src bs
362+ addr <- getProxyProtocolAddr src
363+ http1 True addr istatus src `E.catch` \e ->
364+ case () of
365+ ()
366+ -- See comment below referencing
367+ -- https://github.com/yesodweb/wai/issues/618
368+ | Just NoKeepAliveRequest <- fromException e -> return ()
369+ -- No valid request
370+ | Just (BadFirstLine _) <- fromException e -> return ()
371+ | otherwise -> do
372+ _ <- sendErrorResponse (dummyreq addr) istatus e
373+ throwIO e
236374
237375 where
238− th = threadHandle ii
376+ getProxyProtocolAddr src =
377+ case settingsProxyProtocol settings of
378+ ProxyProtocolNone ->
379+ return origAddr
380+ ProxyProtocolRequired -> do
381+ seg <- readSource src
382+ parseProxyProtocolHeader src seg
383+ ProxyProtocolOptional -> do
384+ seg <- readSource src
385+ if S.isPrefixOf "PROXY " seg
386+ then parseProxyProtocolHeader src seg
387+ else do leftoverSource src seg
388+ return origAddr
389+
390+ parseProxyProtocolHeader src seg = do
391+ let (header,seg') = S.break (== 0x0d) seg -- 0x0d == CR
392+ maybeAddr = case S.split 0x20 header of -- 0x20 == space
393+ ["PROXY","TCP4",clientAddr,_,clientPort,_] ->
394+ case [x | (x, t) <- reads (decodeAscii clientAddr), null t] of
395+ [a] -> Just (SockAddrInet (readInt clientPort)
396+ (toHostAddress a))
397+ _ -> Nothing
398+ ["PROXY","TCP6",clientAddr,_,clientPort,_] ->
399+ case [x | (x, t) <- reads (decodeAscii clientAddr), null t] of
400+ [a] -> Just (SockAddrInet6 (readInt clientPort)
401+ 0
402+ (toHostAddress6 a)
403+ 0)
404+ _ -> Nothing
405+ ("PROXY":"UNKNOWN":_) ->
406+ Just origAddr
407+ _ ->
408+ Nothing
409+ case maybeAddr of
410+ Nothing -> throwIO (BadProxyHeader (decodeAscii header))
411+ Just a -> do leftoverSource src (S.drop 2 seg') -- drop CRLF
412+ return a
239413
240− sendErrorResponse istatus e = do
414+ decodeAscii = map (chr . fromEnum) . S.unpack
415+
416+ shouldSendErrorResponse se
417+ | Just ConnectionClosedByPeer <- fromException se = False
418+ | otherwise = True
419+
420+ sendErrorResponse req istatus e = do
241421 status <- readIORef istatus
242− when status $ void $
243− sendResponse conn ii dummyreq defaultIndexRequestHeader (return S.empty) (errorResponse e)
422+ if shouldSendErrorResponse e && status
423+ then do
424+ sendResponse settings conn ii th req defaultIndexRequestHeader (return S.empty) (errorResponse e)
425+ else return False
244426
245− dummyreq = defaultRequest { remoteHost = addr }
427+ dummyreq addr = defaultRequest { remoteHost = addr }
246428
247429 errorResponse e = settingsOnExceptionResponse settings e
248430
249− recvSendLoop istatus fromClient = do
250− (req', idxhdr) <- recvRequest settings conn ii addr fromClient
251− let req = req' { isSecure = isSecure' }
431+ http1 firstRequest addr istatus src = do
432+ (req, mremainingRef, idxhdr, nextBodyFlush) <- recvRequest firstRequest settings conn ii th addr src transport
433+ keepAlive <- processRequest istatus src req mremainingRef idxhdr nextBodyFlush
434+ `E.catch` \e -> do
435+ settingsOnException settings (Just req) e
436+ -- Don't throw the error again to prevent calling settingsOnException twice.
437+ return False
438+
439+ -- When doing a keep-alive connection, the other side may just
440+ -- close the connection. We don't want to treat that as an
441+ -- exceptional situation, so we pass in False to http1 (which
442+ -- in turn passes in False to recvRequest), indicating that
443+ -- this is not the first request. If, when trying to read the
444+ -- request headers, no data is available, recvRequest will
445+ -- throw a NoKeepAliveRequest exception, which we catch here
446+ -- and ignore. See: https://github.com/yesodweb/wai/issues/618
447+ when keepAlive $ http1 False addr istatus src
448+
449+ processRequest istatus src req mremainingRef idxhdr nextBodyFlush = do
252450 -- Let the application run for as long as it wants
253451 T.pause th
254452
255453 -- In the event that some scarce resource was acquired during
256454 -- creating the request, we need to make sure that we don't get
257455 -- an async exception before calling the ResponseSource.
258− keepAlive <- app req $ \res -> do
456+ keepAliveRef <- newIORef $ error "keepAliveRef not filled"
457+ r <- E.try $ app req $ \res -> do
259458 T.resume th
260459 -- FIXME consider forcing evaluation of the res here to
261460 -- send more meaningful error messages to the user.
262461 -- However, it may affect performance.
263462 writeIORef istatus False
264− sendResponse conn ii req idxhdr (readSource fromClient) res
463+ keepAlive <- sendResponse settings conn ii th req idxhdr (readSource src) res
464+ writeIORef keepAliveRef keepAlive
465+ return ResponseReceived
466+ case r of
467+ Right ResponseReceived -> return ()
468+ Left e@(SomeException _)
469+ | Just (ExceptionInsideResponseBody e') <- fromException e -> throwIO e'
470+ | otherwise -> do
471+ keepAlive <- sendErrorResponse req istatus e
472+ settingsOnException settings (Just req) e
473+ writeIORef keepAliveRef keepAlive
474+
475+ keepAlive <- readIORef keepAliveRef
265476
266477 -- We just send a Response and it takes a time to
267478 -- receive a Request again. If we immediately call recv,
268− -- it is likely to fail and the IO manager works.
269− -- It is very costy. So, we yield to another Haskell
270− -- thread hoping that the next Request will arraive
479+ -- it is likely to fail and cause the IO manager to do some work.
480+ -- It is very costly, so we yield to another Haskell
481+ -- thread hoping that the next Request will arrive
271482 -- when this Haskell thread will be re-scheduled.
272483 -- This improves performance at least when
273484 -- the number of cores is small.
274485 Conc.yield
275486
276− when keepAlive $ do
277− -- flush the rest of the request body
278− flushBody $ requestBody req
279− T.resume th
280− recvSendLoop istatus fromClient
487+ if keepAlive
488+ then
489+ -- If there is an unknown or large amount of data to still be read
490+ -- from the request body, simple drop this connection instead of
491+ -- reading it all in to satisfy a keep-alive request.
492+ case settingsMaximumBodyFlush settings of
493+ Nothing -> do
494+ flushEntireBody nextBodyFlush
495+ T.resume th
496+ return True
497+ Just maxToRead -> do
498+ let tryKeepAlive = do
499+ -- flush the rest of the request body
500+ isComplete <- flushBody nextBodyFlush maxToRead
501+ if isComplete then do
502+ T.resume th
503+ return True
504+ else
505+ return False
506+ case mremainingRef of
507+ Just ref -> do
508+ remaining <- readIORef ref
509+ if remaining <= maxToRead then
510+ tryKeepAlive
511+ else
512+ return False
513+ Nothing -> tryKeepAlive
514+ else
515+ return False
281516
282−flushBody :: IO ByteString -> IO ()
283−flushBody src =
517+ checkTLS = case transport of
518+ TCP -> return () -- direct
519+ tls -> unless (tls12orLater tls) $ goaway conn H2.InadequateSecurity "Weak TLS"
520+ tls12orLater tls = tlsMajorVersion tls == 3 && tlsMinorVersion tls >= 3
521+
522+-- connClose must not be called here since Run:fork calls it
523+goaway :: Connection -> H2.ErrorCodeId -> ByteString -> IO ()
524+goaway Connection{..} etype debugmsg = connSendAll bytestream
525+ where
526+ einfo = H2.encodeInfo id 0
527+ frame = H2.GoAwayFrame 0 etype debugmsg
528+ bytestream = H2.encodeFrame einfo frame
529+
530+flushEntireBody :: IO ByteString -> IO ()
531+flushEntireBody src =
284532 loop
285533 where
286534 loop = do
287535 bs <- src
288536 unless (S.null bs) loop
289537
290−connSource :: Connection -> T.Handle -> IORef Bool -> IO ByteString
291−connSource Connection { connRecv = recv } th istatus = do
538+flushBody :: IO ByteString -- ^ get next chunk
539+ -> Int -- ^ maximum to flush
540+ -> IO Bool -- ^ True == flushed the entire body, False == we didn't
541+flushBody src =
542+ loop
543+ where
544+ loop toRead = do
545+ bs <- src
546+ let toRead' = toRead - S.length bs
547+ case () of
548+ ()
549+ | S.null bs -> return True
550+ | toRead' >= 0 -> loop toRead'
551+ | otherwise -> return False
552+
553+wrappedRecv :: Connection -> T.Handle -> IORef Bool -> Int -> IO ByteString
554+wrappedRecv Connection { connRecv = recv } th istatus slowlorisSize = do
292555 bs <- recv
293556 unless (S.null bs) $ do
294557 writeIORef istatus True
295− when (S.length bs >= 2048) $ T.tickle th
558+ when (S.length bs >= slowlorisSize) $ T.tickle th
559+ return bs
560+
561+wrappedRecvN :: T.Handle -> IORef Bool -> Int -> (BufSize -> IO ByteString) -> (BufSize -> IO ByteString)
562+wrappedRecvN th istatus slowlorisSize readN bufsize = do
563+ bs <- readN bufsize
564+ unless (S.null bs) $ do
565+ writeIORef istatus True
566+ -- TODO: think about the slowloris protection in HTTP2: current code
567+ -- might open a slow-loris attack vector. Rather than timing we should
568+ -- consider limiting the per-client connections assuming that in HTTP2
569+ -- we should allow only few connections per host (real-world
570+ -- deployments with large NATs may be trickier).
571+ when (S.length bs >= slowlorisSize || bufsize <= slowlorisSize) $ T.tickle th
296572 return bs
297573
574+-- | Set flag FileCloseOnExec flag on a socket (on Unix)
575+--
298576-- Copied from: https://github.com/mzero/plush/blob/master/src/Plush/Server/Warp.hs
577+--
578+-- @since 3.2.17
299579setSocketCloseOnExec :: Socket -> IO ()
300580#if WINDOWS
301581setSocketCloseOnExec _ = return ()
302582#else
303−setSocketCloseOnExec socket =
304− setFdOption (fromIntegral $ fdSocket socket) CloseOnExec True
583+setSocketCloseOnExec socket = do
584+#if MIN_VERSION_network(3,0,0)
585+ fd <- fdSocket socket
586+#else
587+ let fd = fdSocket socket
305588#endif
589+ F.setFileCloseOnExec $ fromIntegral fd
590+#endif
591+
592+gracefulShutdown :: Settings -> Counter -> IO ()
593+gracefulShutdown set counter =
594+ case settingsGracefulShutdownTimeout set of
595+ Nothing ->
596+ waitForZero counter
597+ (Just seconds) ->
598+ void (timeout (seconds * microsPerSecond) (waitForZero counter))
599+ where microsPerSecond = 1000000