{-# LANGUAGE NamedFieldPuns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE PatternGuards #-}
{-# LANGUAGE RecordWildCards #-}

module Network.HTTP2.Arch.Receiver (
    frameReceiver
  , maxConcurrency
  , initialFrame
  ) where

import Control.Concurrent
import Control.Concurrent.STM
import qualified Control.Exception as E
import qualified Data.ByteString as BS
import qualified Data.ByteString.Char8 as C8
import Data.IORef

import Imports hiding (delete, insert)
import Network.HPACK
import Network.HPACK.Token
import Network.HTTP2.Arch.Context
import Network.HTTP2.Arch.EncodeFrame
import Network.HTTP2.Arch.HPACK
import Network.HTTP2.Arch.Queue
import Network.HTTP2.Arch.Rate
import Network.HTTP2.Arch.Stream
import Network.HTTP2.Arch.Types
import Network.HTTP2.Frame

----------------------------------------------------------------

maxConcurrency :: Int
maxConcurrency :: Int
maxConcurrency = Int
recommendedConcurrency

continuationLimit :: Int
continuationLimit :: Int
continuationLimit = Int
10

headerFragmentLimit :: Int
headerFragmentLimit :: Int
headerFragmentLimit = Int
51200 -- 50K

pingRateLimit :: Int
pingRateLimit :: Int
pingRateLimit = Int
4

settingsRateLimit :: Int
settingsRateLimit :: Int
settingsRateLimit = Int
4

emptyFrameRateLimit :: Int
emptyFrameRateLimit :: Int
emptyFrameRateLimit = Int
4

----------------------------------------------------------------

initialFrame :: ByteString
initialFrame :: ByteString
initialFrame = (FrameFlags -> FrameFlags) -> SettingsList -> ByteString
settingsFrame forall a. a -> a
id [(SettingsKeyId
SettingsMaxConcurrentStreams,Int
maxConcurrency)]

----------------------------------------------------------------

type RecvN = Int -> IO ByteString

frameReceiver :: Context -> RecvN -> IO ()
frameReceiver :: Context -> RecvN -> IO ()
frameReceiver ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
..} RecvN
recvN = Int -> IO ()
loop Int
0 forall e a. Exception e => IO a -> (e -> IO a) -> IO a
`E.catch` SomeException -> IO ()
sendGoaway
  where
    loop :: Int -> IO ()
    loop :: Int -> IO ()
loop Int
n
      | Int
n forall a. Eq a => a -> a -> Bool
== Int
6 = do
          IO ()
yield
          Int -> IO ()
loop Int
0
      | Bool
otherwise = do
        ByteString
hd <- RecvN
recvN Int
frameHeaderLength
        if ByteString -> Bool
BS.null ByteString
hd then
            TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ Control
CFinish
          else do
            Bool
cont <- Context -> RecvN -> (FrameTypeId, FrameHeader) -> IO Bool
processFrame Context
ctx RecvN
recvN forall a b. (a -> b) -> a -> b
$ ByteString -> (FrameTypeId, FrameHeader)
decodeFrameHeader ByteString
hd
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
cont forall a b. (a -> b) -> a -> b
$ Int -> IO ()
loop (Int
n forall a. Num a => a -> a -> a
+ Int
1)

    sendGoaway :: SomeException -> IO ()
sendGoaway SomeException
e
      | Just (ConnectionError ErrorCodeId
err ByteString
msg) <- forall e. Exception e => SomeException -> Maybe e
E.fromException SomeException
e = do
          Int
psid <- Context -> IO Int
getPeerStreamID Context
ctx
          let frame :: ByteString
frame = Int -> ErrorCodeId -> ByteString -> ByteString
goawayFrame Int
psid ErrorCodeId
err ByteString
msg
          TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ forall a b. (a -> b) -> a -> b
$ ByteString -> Control
CGoaway ByteString
frame
      | Bool
otherwise = forall (m :: * -> *) a. Monad m => a -> m a
return ()

----------------------------------------------------------------

processFrame :: Context -> RecvN -> (FrameTypeId, FrameHeader) -> IO Bool
processFrame :: Context -> RecvN -> (FrameTypeId, FrameHeader) -> IO Bool
processFrame Context
ctx RecvN
_recvN (FrameTypeId
fid, FrameHeader{Int
streamId :: FrameHeader -> Int
streamId :: Int
streamId})
  | Context -> Bool
isServer Context
ctx Bool -> Bool -> Bool
&&
    Int -> Bool
isServerInitiated Int
streamId Bool -> Bool -> Bool
&&
    (FrameTypeId
fid forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`notElem` [FrameTypeId
FramePriority,FrameTypeId
FrameRSTStream,FrameTypeId
FrameWindowUpdate]) =
    forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"stream id should be odd"
processFrame Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} RecvN
recvN (FrameUnknown FrameFlags
_, FrameHeader{Int
payloadLength :: FrameHeader -> Int
payloadLength :: Int
payloadLength}) = do
    Maybe Int
mx <- forall a. IORef a -> IO a
readIORef IORef (Maybe Int)
continued
    case Maybe Int
mx of
        Maybe Int
Nothing -> do
            -- ignoring unknown frame
            forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ RecvN
recvN Int
payloadLength
            forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
        Just Int
_  -> forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"unknown frame"
processFrame Context
ctx RecvN
recvN (FrameTypeId
FramePushPromise, header :: FrameHeader
header@FrameHeader{Int
payloadLength :: Int
payloadLength :: FrameHeader -> Int
payloadLength})
  | Context -> Bool
isServer Context
ctx = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"push promise is not allowed"
  | Bool
otherwise = do
      ByteString
pl <- RecvN
recvN Int
payloadLength
      PushPromiseFrame Int
sid ByteString
frag <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodePushPromiseFrame FrameHeader
header ByteString
pl
      forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless (Int -> Bool
isServerInitiated Int
sid) forall a b. (a -> b) -> a -> b
$
          forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"wrong sid for push promise"
      forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (ByteString
frag forall a. Eq a => a -> a -> Bool
== ByteString
"") forall a b. (a -> b) -> a -> b
$
          forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"wrong header fragment for push promise"
      (TokenHeaderList
_,ValueTable
vt) <- ByteString -> Context -> IO (TokenHeaderList, ValueTable)
hpackDecodeHeader ByteString
frag Context
ctx
      let ClientInfo{ByteString
IORef (Cache (ByteString, ByteString) Stream)
cache :: RoleInfo -> IORef (Cache (ByteString, ByteString) Stream)
authority :: RoleInfo -> ByteString
scheme :: RoleInfo -> ByteString
cache :: IORef (Cache (ByteString, ByteString) Stream)
authority :: ByteString
scheme :: ByteString
..} = Context -> RoleInfo
roleInfo Context
ctx
      forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenAuthority ValueTable
vt forall a. Eq a => a -> a -> Bool
== forall a. a -> Maybe a
Just ByteString
authority
         Bool -> Bool -> Bool
&& Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenScheme    ValueTable
vt forall a. Eq a => a -> a -> Bool
== forall a. a -> Maybe a
Just ByteString
scheme) forall a b. (a -> b) -> a -> b
$ do
          let mmethod :: Maybe ByteString
mmethod = Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenMethod ValueTable
vt
              mpath :: Maybe ByteString
mpath   = Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenPath   ValueTable
vt
          case (Maybe ByteString
mmethod, Maybe ByteString
mpath) of
            (Just ByteString
method, Just ByteString
path) -> do
                Stream
strm <- Context -> Int -> FrameTypeId -> IO Stream
openStream Context
ctx Int
sid FrameTypeId
FramePushPromise
                ByteString -> ByteString -> Stream -> RoleInfo -> IO ()
insertCache ByteString
method ByteString
path Stream
strm forall a b. (a -> b) -> a -> b
$ Context -> RoleInfo
roleInfo Context
ctx
            (Maybe ByteString, Maybe ByteString)
_ -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
      forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
processFrame ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} RecvN
recvN typhdr :: (FrameTypeId, FrameHeader)
typhdr@(FrameTypeId
ftyp, header :: FrameHeader
header@FrameHeader{Int
payloadLength :: Int
payloadLength :: FrameHeader -> Int
payloadLength}) = do
    Settings
settings <- forall a. IORef a -> IO a
readIORef IORef Settings
http2settings
    case Settings
-> (FrameTypeId, FrameHeader)
-> Either HTTP2Error (FrameTypeId, FrameHeader)
checkFrameHeader Settings
settings (FrameTypeId, FrameHeader)
typhdr of
      Left HTTP2Error
h2err -> case HTTP2Error
h2err of
          StreamError ErrorCodeId
err Int
sid -> do
              ErrorCodeId -> Int -> IO ()
resetStream ErrorCodeId
err Int
sid
              forall (f :: * -> *) a. Functor f => f a -> f ()
void forall a b. (a -> b) -> a -> b
$ RecvN
recvN Int
payloadLength
              forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
          HTTP2Error
connErr -> forall e a. Exception e => e -> IO a
E.throwIO HTTP2Error
connErr
      Right (FrameTypeId, FrameHeader)
_ -> do
          Either HTTP2Error Bool
ex <- forall e a. Exception e => IO a -> IO (Either e a)
E.try forall a b. (a -> b) -> a -> b
$ Context -> RecvN -> FrameTypeId -> FrameHeader -> IO Bool
controlOrStream Context
ctx RecvN
recvN FrameTypeId
ftyp FrameHeader
header
          case Either HTTP2Error Bool
ex of
              Left (StreamError ErrorCodeId
err Int
sid) -> do
                  ErrorCodeId -> Int -> IO ()
resetStream ErrorCodeId
err Int
sid
                  forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
              Left HTTP2Error
connErr -> forall a e. Exception e => e -> a
E.throw HTTP2Error
connErr
              Right Bool
cont -> forall (m :: * -> *) a. Monad m => a -> m a
return Bool
cont
  where
    resetStream :: ErrorCodeId -> Int -> IO ()
resetStream ErrorCodeId
err Int
sid = do
        let frame :: ByteString
frame = ErrorCodeId -> Int -> ByteString
resetFrame ErrorCodeId
err Int
sid
        TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ forall a b. (a -> b) -> a -> b
$ ByteString -> Control
CFrame ByteString
frame

----------------------------------------------------------------

controlOrStream :: Context -> RecvN -> FrameTypeId -> FrameHeader -> IO Bool
controlOrStream :: Context -> RecvN -> FrameTypeId -> FrameHeader -> IO Bool
controlOrStream ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} RecvN
recvN FrameTypeId
ftyp header :: FrameHeader
header@FrameHeader{Int
streamId :: Int
streamId :: FrameHeader -> Int
streamId, Int
payloadLength :: Int
payloadLength :: FrameHeader -> Int
payloadLength}
  | Int -> Bool
isControl Int
streamId = do
      ByteString
pl <- RecvN
recvN Int
payloadLength
      FrameTypeId -> FrameHeader -> ByteString -> Context -> IO Bool
control FrameTypeId
ftyp FrameHeader
header ByteString
pl Context
ctx
  | Bool
otherwise = do
      IO ()
checkContinued
      Maybe Stream
mstrm <- Context -> FrameTypeId -> Int -> IO (Maybe Stream)
getStream Context
ctx FrameTypeId
ftyp Int
streamId
      ByteString
pl <- RecvN
recvN Int
payloadLength
      case Maybe Stream
mstrm of
        Just Stream
strm -> do
            StreamState
state0 <- Stream -> IO StreamState
readStreamState Stream
strm
            StreamState
state <- FrameTypeId
-> FrameHeader
-> ByteString
-> Context
-> StreamState
-> Stream
-> IO StreamState
stream FrameTypeId
ftyp FrameHeader
header ByteString
pl Context
ctx StreamState
state0 Stream
strm
            IO ()
resetContinued
            Bool
set <- StreamState -> Context -> Stream -> Int -> IO Bool
processState StreamState
state Context
ctx Stream
strm Int
streamId
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
set IO ()
setContinued
        Maybe Stream
Nothing
          | FrameTypeId
ftyp forall a. Eq a => a -> a -> Bool
== FrameTypeId
FramePriority -> do
                -- for h2spec only
                PriorityFrame Priority
newpri <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodePriorityFrame FrameHeader
header ByteString
pl
                Priority -> Int -> IO ()
checkPriority Priority
newpri Int
streamId
          | Bool
otherwise -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
      forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
  where
    setContinued :: IO ()
setContinued   = forall a. IORef a -> a -> IO ()
writeIORef IORef (Maybe Int)
continued forall a b. (a -> b) -> a -> b
$ forall a. a -> Maybe a
Just Int
streamId
    resetContinued :: IO ()
resetContinued = forall a. IORef a -> a -> IO ()
writeIORef IORef (Maybe Int)
continued forall a. Maybe a
Nothing
    checkContinued :: IO ()
checkContinued = do
        Maybe Int
mx <- forall a. IORef a -> IO a
readIORef IORef (Maybe Int)
continued
        case Maybe Int
mx of
            Maybe Int
Nothing  -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
            Just Int
sid
              | Int
sid forall a. Eq a => a -> a -> Bool
== Int
streamId Bool -> Bool -> Bool
&& FrameTypeId
ftyp forall a. Eq a => a -> a -> Bool
== FrameTypeId
FrameContinuation -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
              | Bool
otherwise -> forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"continuation frame must follow"

----------------------------------------------------------------

processState :: StreamState -> Context -> Stream -> StreamId -> IO Bool
processState :: StreamState -> Context -> Stream -> Int -> IO Bool
processState (Open (NoBody tbl :: (TokenHeaderList, ValueTable)
tbl@(TokenHeaderList
_,ValueTable
reqvt))) ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} strm :: Stream
strm@Stream{MVar InpObj
streamInput :: Stream -> MVar InpObj
streamInput :: MVar InpObj
streamInput} Int
streamId = do
    let mcl :: Maybe Int
mcl = forall a b. (a, b) -> a
fst forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenContentLength ValueTable
reqvt forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= ByteString -> Maybe (Int, ByteString)
C8.readInt)
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (forall a. Maybe a -> (a -> Bool) -> Bool
just Maybe Int
mcl (forall a. Eq a => a -> a -> Bool
/= (Int
0 :: Int))) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
ProtocolError Int
streamId
    Context -> Stream -> IO ()
halfClosedRemote Context
ctx Stream
strm
    IORef (Maybe (TokenHeaderList, ValueTable))
tlr <- forall a. a -> IO (IORef a)
newIORef forall a. Maybe a
Nothing
    let inpObj :: InpObj
inpObj = (TokenHeaderList, ValueTable)
-> Maybe Int
-> InpBody
-> IORef (Maybe (TokenHeaderList, ValueTable))
-> InpObj
InpObj (TokenHeaderList, ValueTable)
tbl (forall a. a -> Maybe a
Just Int
0) (forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
"") IORef (Maybe (TokenHeaderList, ValueTable))
tlr
    if Context -> Bool
isServer Context
ctx then
        forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> a -> STM ()
writeTQueue (RoleInfo -> TQueue (Input Stream)
inputQ RoleInfo
roleInfo) forall a b. (a -> b) -> a -> b
$ forall a. a -> InpObj -> Input a
Input Stream
strm InpObj
inpObj
      else
        forall a. MVar a -> a -> IO ()
putMVar MVar InpObj
streamInput InpObj
inpObj
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
processState (Open (HasBody tbl :: (TokenHeaderList, ValueTable)
tbl@(TokenHeaderList
_,ValueTable
reqvt))) ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} strm :: Stream
strm@Stream{MVar InpObj
streamInput :: MVar InpObj
streamInput :: Stream -> MVar InpObj
streamInput} Int
streamId = do
    let mcl :: Maybe Int
mcl = forall a b. (a, b) -> a
fst forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> (Token -> ValueTable -> Maybe ByteString
getHeaderValue Token
tokenContentLength ValueTable
reqvt forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= ByteString -> Maybe (Int, ByteString)
C8.readInt)
    IORef Int
bodyLength <- forall a. a -> IO (IORef a)
newIORef Int
0
    IORef (Maybe (TokenHeaderList, ValueTable))
tlr <- forall a. a -> IO (IORef a)
newIORef forall a. Maybe a
Nothing
    TQueue ByteString
q <- forall a. IO (TQueue a)
newTQueueIO
    Context -> Stream -> StreamState -> IO ()
setStreamState Context
ctx Stream
strm forall a b. (a -> b) -> a -> b
$ OpenState -> StreamState
Open (TQueue ByteString
-> Maybe Int
-> IORef Int
-> IORef (Maybe (TokenHeaderList, ValueTable))
-> OpenState
Body TQueue ByteString
q Maybe Int
mcl IORef Int
bodyLength IORef (Maybe (TokenHeaderList, ValueTable))
tlr)
    Source
bodySource <- (Int -> IO ()) -> TQueue ByteString -> IO Source
mkSource (TQueue Control -> Int -> Int -> IO ()
updateWindow TQueue Control
controlQ Int
streamId) TQueue ByteString
q
    let inpObj :: InpObj
inpObj = (TokenHeaderList, ValueTable)
-> Maybe Int
-> InpBody
-> IORef (Maybe (TokenHeaderList, ValueTable))
-> InpObj
InpObj (TokenHeaderList, ValueTable)
tbl Maybe Int
mcl (Source -> InpBody
readSource Source
bodySource) IORef (Maybe (TokenHeaderList, ValueTable))
tlr
    if Context -> Bool
isServer Context
ctx then
        forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> a -> STM ()
writeTQueue (RoleInfo -> TQueue (Input Stream)
inputQ RoleInfo
roleInfo) forall a b. (a -> b) -> a -> b
$ forall a. a -> InpObj -> Input a
Input Stream
strm InpObj
inpObj
      else
        forall a. MVar a -> a -> IO ()
putMVar MVar InpObj
streamInput InpObj
inpObj
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
processState s :: StreamState
s@(Open Continued{}) Context
ctx Stream
strm Int
_streamId = do
    Context -> Stream -> StreamState -> IO ()
setStreamState Context
ctx Stream
strm StreamState
s
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
processState StreamState
HalfClosedRemote Context
ctx Stream
strm Int
_streamId = do
    Context -> Stream -> IO ()
halfClosedRemote Context
ctx Stream
strm
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False
processState StreamState
s Context
ctx Stream
strm Int
_streamId = do
    -- Idle, Open Body, Closed
    Context -> Stream -> StreamState -> IO ()
setStreamState Context
ctx Stream
strm StreamState
s
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False

----------------------------------------------------------------

getStream :: Context -> FrameTypeId -> StreamId -> IO (Maybe Stream)
getStream :: Context -> FrameTypeId -> Int -> IO (Maybe Stream)
getStream ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} FrameTypeId
ftyp Int
streamId =
    StreamTable -> Int -> IO (Maybe Stream)
search StreamTable
streamTable Int
streamId forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= Context -> FrameTypeId -> Int -> Maybe Stream -> IO (Maybe Stream)
getStream' Context
ctx FrameTypeId
ftyp Int
streamId

getStream' :: Context -> FrameTypeId -> StreamId -> Maybe Stream -> IO (Maybe Stream)
getStream' :: Context -> FrameTypeId -> Int -> Maybe Stream -> IO (Maybe Stream)
getStream' Context
ctx FrameTypeId
ftyp Int
_streamId js :: Maybe Stream
js@(Just Stream
strm0) = do
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (FrameTypeId
ftyp forall a. Eq a => a -> a -> Bool
== FrameTypeId
FrameHeaders) forall a b. (a -> b) -> a -> b
$ do
        StreamState
st <- Stream -> IO StreamState
readStreamState Stream
strm0
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (StreamState -> Bool
isHalfClosedRemote StreamState
st) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
StreamClosed ByteString
"header must not be sent to half or fully closed stream"
        -- Priority made an idle stream
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (StreamState -> Bool
isIdle StreamState
st) forall a b. (a -> b) -> a -> b
$ Context -> Stream -> IO ()
opened Context
ctx Stream
strm0
    forall (m :: * -> *) a. Monad m => a -> m a
return Maybe Stream
js
getStream' ctx :: Context
ctx@Context{IORef Bool
IORef Int
IORef (Maybe Int)
IORef Settings
DynamicTable
TVar Int
TQueue Control
TQueue (Output Stream)
Rate
StreamTable
RoleInfo
Role
emptyFrameRate :: Rate
settingsRate :: Rate
pingRate :: Rate
connectionWindow :: TVar Int
decodeDynamicTable :: DynamicTable
encodeDynamicTable :: DynamicTable
controlQ :: TQueue Control
outputQ :: TQueue (Output Stream)
peerStreamId :: IORef Int
myStreamId :: IORef Int
continued :: IORef (Maybe Int)
concurrency :: IORef Int
streamTable :: StreamTable
firstSettings :: IORef Bool
http2settings :: IORef Settings
roleInfo :: RoleInfo
role :: Role
emptyFrameRate :: Context -> Rate
settingsRate :: Context -> Rate
pingRate :: Context -> Rate
connectionWindow :: Context -> TVar Int
decodeDynamicTable :: Context -> DynamicTable
encodeDynamicTable :: Context -> DynamicTable
controlQ :: Context -> TQueue Control
outputQ :: Context -> TQueue (Output Stream)
peerStreamId :: Context -> IORef Int
myStreamId :: Context -> IORef Int
continued :: Context -> IORef (Maybe Int)
concurrency :: Context -> IORef Int
streamTable :: Context -> StreamTable
firstSettings :: Context -> IORef Bool
http2settings :: Context -> IORef Settings
roleInfo :: Context -> RoleInfo
role :: Context -> Role
..} FrameTypeId
ftyp Int
streamId Maybe Stream
Nothing
  | Int -> Bool
isServerInitiated Int
streamId = forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing
  | Context -> Bool
isServer Context
ctx = do
        Int
csid <- Context -> IO Int
getPeerStreamID Context
ctx
        if Int
streamId forall a. Ord a => a -> a -> Bool
<= Int
csid then -- consider the stream closed
          if FrameTypeId
ftyp forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`elem` [FrameTypeId
FrameWindowUpdate, FrameTypeId
FrameRSTStream, FrameTypeId
FramePriority] then
              forall (m :: * -> *) a. Monad m => a -> m a
return forall a. Maybe a
Nothing -- will be ignored
            else
              forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"stream identifier must not decrease"
          else do -- consider the stream idle
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (FrameTypeId
ftyp forall (t :: * -> *) a. (Foldable t, Eq a) => a -> t a -> Bool
`notElem` [FrameTypeId
FrameHeaders,FrameTypeId
FramePriority]) forall a b. (a -> b) -> a -> b
$
                forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError forall a b. (a -> b) -> a -> b
$ ByteString
"this frame is not allowed in an idle stream: " ByteString -> ByteString -> ByteString
`BS.append` String -> ByteString
C8.pack (forall a. Show a => a -> String
show FrameTypeId
ftyp)
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (FrameTypeId
ftyp forall a. Eq a => a -> a -> Bool
== FrameTypeId
FrameHeaders) forall a b. (a -> b) -> a -> b
$ do
                Context -> Int -> IO ()
setPeerStreamID Context
ctx Int
streamId
                Int
cnt <- forall a. IORef a -> IO a
readIORef IORef Int
concurrency
                -- Checking the limitation of concurrency
                forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
cnt forall a. Ord a => a -> a -> Bool
>= Int
maxConcurrency) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
RefusedStream Int
streamId
            forall a. a -> Maybe a
Just forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> Context -> Int -> FrameTypeId -> IO Stream
openStream Context
ctx Int
streamId FrameTypeId
ftyp
  | Bool
otherwise = forall a. HasCallStack => a
undefined -- never reach

----------------------------------------------------------------

control :: FrameTypeId -> FrameHeader -> ByteString -> Context -> IO Bool
control :: FrameTypeId -> FrameHeader -> ByteString -> Context -> IO Bool
control FrameTypeId
FrameSettings header :: FrameHeader
header@FrameHeader{FrameFlags
flags :: FrameHeader -> FrameFlags
flags :: FrameFlags
flags} ByteString
bs Context{IORef Settings
http2settings :: IORef Settings
http2settings :: Context -> IORef Settings
http2settings, TQueue Control
controlQ :: TQueue Control
controlQ :: Context -> TQueue Control
controlQ, IORef Bool
firstSettings :: IORef Bool
firstSettings :: Context -> IORef Bool
firstSettings, StreamTable
streamTable :: StreamTable
streamTable :: Context -> StreamTable
streamTable, Rate
settingsRate :: Rate
settingsRate :: Context -> Rate
settingsRate} = do
    SettingsFrame SettingsList
alist <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeSettingsFrame FrameHeader
header ByteString
bs
    forall (t :: * -> *) (f :: * -> *) a b.
(Foldable t, Applicative f) =>
(a -> f b) -> t a -> f ()
traverse_ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ SettingsList -> Maybe HTTP2Error
checkSettingsList SettingsList
alist
    -- HTTP/2 Setting from a browser
    if FrameFlags -> Bool
testAck FrameFlags
flags then
        forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
      else do
        -- Settings Flood - CVE-2019-9515
        Int
rate <- Rate -> IO Int
getRate Rate
settingsRate
        if Int
rate forall a. Ord a => a -> a -> Bool
> Int
settingsRateLimit then
            forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"too many settings"
          else do
            Int
oldws <- Settings -> Int
initialWindowSize forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. IORef a -> IO a
readIORef IORef Settings
http2settings
            forall a. IORef a -> (a -> a) -> IO ()
modifyIORef' IORef Settings
http2settings forall a b. (a -> b) -> a -> b
$ \Settings
old -> Settings -> SettingsList -> Settings
updateSettings Settings
old SettingsList
alist
            Int
newws <- Settings -> Int
initialWindowSize forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. IORef a -> IO a
readIORef IORef Settings
http2settings
            let diff :: Int
diff = Int
newws forall a. Num a => a -> a -> a
- Int
oldws
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
diff forall a. Eq a => a -> a -> Bool
/= Int
0) forall a b. (a -> b) -> a -> b
$ (Int -> Int) -> StreamTable -> IO ()
updateAllStreamWindow (forall a. Num a => a -> a -> a
+ Int
diff) StreamTable
streamTable
            let frame :: ByteString
frame = (FrameFlags -> FrameFlags) -> SettingsList -> ByteString
settingsFrame FrameFlags -> FrameFlags
setAck []
            Bool
sent <- forall a. IORef a -> IO a
readIORef IORef Bool
firstSettings
            let setframe :: Control
setframe
                  | Bool
sent      = ByteString -> SettingsList -> Control
CSettings               ByteString
frame SettingsList
alist
                  | Bool
otherwise = ByteString -> ByteString -> SettingsList -> Control
CSettings0 ByteString
initialFrame ByteString
frame SettingsList
alist
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless Bool
sent forall a b. (a -> b) -> a -> b
$ forall a. IORef a -> a -> IO ()
writeIORef IORef Bool
firstSettings Bool
True
            TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ Control
setframe
            forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True

control FrameTypeId
FramePing FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags} ByteString
bs Context{TQueue Control
controlQ :: TQueue Control
controlQ :: Context -> TQueue Control
controlQ,Rate
pingRate :: Rate
pingRate :: Context -> Rate
pingRate} =
    if FrameFlags -> Bool
testAck FrameFlags
flags then
        forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True
      else do
        -- Ping Flood - CVE-2019-9512
        Int
rate <- Rate -> IO Int
getRate Rate
pingRate
        if Int
rate forall a. Ord a => a -> a -> Bool
> Int
pingRateLimit then
            forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"too many ping"
          else do
            let frame :: ByteString
frame = ByteString -> ByteString
pingFrame ByteString
bs
            TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ forall a b. (a -> b) -> a -> b
$ ByteString -> Control
CFrame ByteString
frame
            forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True

control FrameTypeId
FrameGoAway FrameHeader
_ ByteString
_ Context{TQueue Control
controlQ :: TQueue Control
controlQ :: Context -> TQueue Control
controlQ} = do
    TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ Control
CFinish
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False

control FrameTypeId
FrameWindowUpdate FrameHeader
header ByteString
bs Context{TVar Int
connectionWindow :: TVar Int
connectionWindow :: Context -> TVar Int
connectionWindow} = do
    WindowUpdateFrame Int
n <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeWindowUpdateFrame FrameHeader
header ByteString
bs
    Int
w <- forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ do
      Int
w0 <- forall a. TVar a -> STM a
readTVar TVar Int
connectionWindow
      let w1 :: Int
w1 = Int
w0 forall a. Num a => a -> a -> a
+ Int
n
      forall a. TVar a -> a -> STM ()
writeTVar TVar Int
connectionWindow Int
w1
      forall (m :: * -> *) a. Monad m => a -> m a
return Int
w1
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int -> Bool
isWindowOverflow Int
w) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
FlowControlError ByteString
"control window should be less than 2^31"
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
True

control FrameTypeId
_ FrameHeader
_ ByteString
_ Context
_ =
    -- must not reach here
    forall (m :: * -> *) a. Monad m => a -> m a
return Bool
False

----------------------------------------------------------------

{-# INLINE guardIt #-}
guardIt :: Either HTTP2Error a -> IO a
guardIt :: forall a. Either HTTP2Error a -> IO a
guardIt Either HTTP2Error a
x = case Either HTTP2Error a
x of
    Left HTTP2Error
err    -> forall e a. Exception e => e -> IO a
E.throwIO HTTP2Error
err
    Right a
frame -> forall (m :: * -> *) a. Monad m => a -> m a
return a
frame


{-# INLINE checkPriority #-}
checkPriority :: Priority -> StreamId -> IO ()
checkPriority :: Priority -> Int -> IO ()
checkPriority Priority
p Int
me
  | Int
dep forall a. Eq a => a -> a -> Bool
== Int
me = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
ProtocolError Int
me
  | Bool
otherwise = forall (m :: * -> *) a. Monad m => a -> m a
return ()
  where
    dep :: Int
dep = Priority -> Int
streamDependency Priority
p

stream :: FrameTypeId -> FrameHeader -> ByteString -> Context -> StreamState -> Stream -> IO StreamState
stream :: FrameTypeId
-> FrameHeader
-> ByteString
-> Context
-> StreamState
-> Stream
-> IO StreamState
stream FrameTypeId
FrameHeaders header :: FrameHeader
header@FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags} ByteString
bs Context
ctx s :: StreamState
s@(Open OpenState
JustOpened) Stream{Int
streamNumber :: Stream -> Int
streamNumber :: Int
streamNumber} = do
    HeadersFrame Maybe Priority
mp ByteString
frag <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeHeadersFrame FrameHeader
header ByteString
bs
    let endOfStream :: Bool
endOfStream = FrameFlags -> Bool
testEndStream FrameFlags
flags
        endOfHeader :: Bool
endOfHeader = FrameFlags -> Bool
testEndHeader FrameFlags
flags
    if ByteString
frag forall a. Eq a => a -> a -> Bool
== ByteString
"" Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
endOfStream Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
endOfHeader then do
        -- Empty Frame Flooding - CVE-2019-9518
        Int
rate <- Rate -> IO Int
getRate forall a b. (a -> b) -> a -> b
$ Context -> Rate
emptyFrameRate Context
ctx
        if Int
rate forall a. Ord a => a -> a -> Bool
> Int
emptyFrameRateLimit then
            forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"too many empty headers"
          else
            forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s
      else do
        case Maybe Priority
mp of
          Maybe Priority
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
          Just Priority
p  -> Priority -> Int -> IO ()
checkPriority Priority
p Int
streamNumber
        if Bool
endOfHeader then do
            (TokenHeaderList, ValueTable)
tbl <- ByteString -> Context -> IO (TokenHeaderList, ValueTable)
hpackDecodeHeader ByteString
frag Context
ctx
            forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ if Bool
endOfStream then
                        OpenState -> StreamState
Open ((TokenHeaderList, ValueTable) -> OpenState
NoBody (TokenHeaderList, ValueTable)
tbl)
                       else
                        OpenState -> StreamState
Open ((TokenHeaderList, ValueTable) -> OpenState
HasBody (TokenHeaderList, ValueTable)
tbl)
          else do
            let siz :: Int
siz = ByteString -> Int
BS.length ByteString
frag
            forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ OpenState -> StreamState
Open forall a b. (a -> b) -> a -> b
$ [ByteString] -> Int -> Int -> Bool -> OpenState
Continued [ByteString
frag] Int
siz Int
1 Bool
endOfStream

stream FrameTypeId
FrameHeaders header :: FrameHeader
header@FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags} ByteString
bs Context
ctx (Open (Body TQueue ByteString
q Maybe Int
_ IORef Int
_ IORef (Maybe (TokenHeaderList, ValueTable))
tlr)) Stream
_ = do
    HeadersFrame Maybe Priority
_ ByteString
frag <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeHeadersFrame FrameHeader
header ByteString
bs
    let endOfStream :: Bool
endOfStream = FrameFlags -> Bool
testEndStream FrameFlags
flags
    -- checking frag == "" is not necessary
    if Bool
endOfStream then do
        (TokenHeaderList, ValueTable)
tbl <- ByteString -> Context -> IO (TokenHeaderList, ValueTable)
hpackDecodeTrailer ByteString
frag Context
ctx
        forall a. IORef a -> a -> IO ()
writeIORef IORef (Maybe (TokenHeaderList, ValueTable))
tlr (forall a. a -> Maybe a
Just (TokenHeaderList, ValueTable)
tbl)
        forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> a -> STM ()
writeTQueue TQueue ByteString
q ByteString
""
        forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
HalfClosedRemote
      else
        -- we don't support continuation here.
        forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"continuation in trailer is not supported"

-- ignore data-frame except for flow-control when we're done locally
stream FrameTypeId
FrameData
       FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags,Int
payloadLength :: Int
payloadLength :: FrameHeader -> Int
payloadLength}
       ByteString
_bs
       Context{TQueue Control
controlQ :: TQueue Control
controlQ :: Context -> TQueue Control
controlQ} s :: StreamState
s@(HalfClosedLocal ClosedCode
_)
       Stream
_ = do
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
payloadLength forall a. Eq a => a -> a -> Bool
/= Int
0) forall a b. (a -> b) -> a -> b
$ do
        let frame :: ByteString
frame = Int -> Int -> ByteString
windowUpdateFrame Int
0 Int
payloadLength
        TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ forall a b. (a -> b) -> a -> b
$ ByteString -> Control
CFrame ByteString
frame
    let endOfStream :: Bool
endOfStream = FrameFlags -> Bool
testEndStream FrameFlags
flags
    if Bool
endOfStream then do
        forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
HalfClosedRemote
      else
        forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s

stream FrameTypeId
FrameData
       header :: FrameHeader
header@FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags,Int
payloadLength :: Int
payloadLength :: FrameHeader -> Int
payloadLength,Int
streamId :: Int
streamId :: FrameHeader -> Int
streamId}
       ByteString
bs
       Context{Rate
emptyFrameRate :: Rate
emptyFrameRate :: Context -> Rate
emptyFrameRate} s :: StreamState
s@(Open (Body TQueue ByteString
q Maybe Int
mcl IORef Int
bodyLength IORef (Maybe (TokenHeaderList, ValueTable))
_))
       Stream
_ = do
    DataFrame ByteString
body <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeDataFrame FrameHeader
header ByteString
bs
    Int
len0 <- forall a. IORef a -> IO a
readIORef IORef Int
bodyLength
    let len :: Int
len = Int
len0 forall a. Num a => a -> a -> a
+ Int
payloadLength
        endOfStream :: Bool
endOfStream = FrameFlags -> Bool
testEndStream FrameFlags
flags
    -- Empty Frame Flooding - CVE-2019-9518
    if ByteString
body forall a. Eq a => a -> a -> Bool
== ByteString
"" then
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless Bool
endOfStream forall a b. (a -> b) -> a -> b
$ do
            Int
rate <- Rate -> IO Int
getRate Rate
emptyFrameRate
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
rate forall a. Ord a => a -> a -> Bool
> Int
emptyFrameRateLimit) forall a b. (a -> b) -> a -> b
$ do
                forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"too many empty data"
      else do
        forall a. IORef a -> a -> IO ()
writeIORef IORef Int
bodyLength Int
len
        forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> a -> STM ()
writeTQueue TQueue ByteString
q ByteString
body
    if Bool
endOfStream then do
        case Maybe Int
mcl of
            Maybe Int
Nothing -> forall (m :: * -> *) a. Monad m => a -> m a
return ()
            Just Int
cl -> forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
cl forall a. Eq a => a -> a -> Bool
/= Int
len) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
ProtocolError Int
streamId
        -- no trailers
        forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> a -> STM ()
writeTQueue TQueue ByteString
q ByteString
""
        forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
HalfClosedRemote
      else
        forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s

stream FrameTypeId
FrameContinuation FrameHeader{FrameFlags
flags :: FrameFlags
flags :: FrameHeader -> FrameFlags
flags} ByteString
frag Context
ctx s :: StreamState
s@(Open (Continued [ByteString]
rfrags Int
siz Int
n Bool
endOfStream)) Stream
_ = do
    let endOfHeader :: Bool
endOfHeader = FrameFlags -> Bool
testEndHeader FrameFlags
flags
    if ByteString
frag forall a. Eq a => a -> a -> Bool
== ByteString
"" Bool -> Bool -> Bool
&& Bool -> Bool
not Bool
endOfHeader then do
        -- Empty Frame Flooding - CVE-2019-9518
        Int
rate <- Rate -> IO Int
getRate forall a b. (a -> b) -> a -> b
$ Context -> Rate
emptyFrameRate Context
ctx
        if Int
rate forall a. Ord a => a -> a -> Bool
> Int
emptyFrameRateLimit then
            forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"too many empty continuation"
          else
            forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s
      else do
        let rfrags' :: [ByteString]
rfrags' = ByteString
frag forall a. a -> [a] -> [a]
: [ByteString]
rfrags
            siz' :: Int
siz' = Int
siz forall a. Num a => a -> a -> a
+ ByteString -> Int
BS.length ByteString
frag
            n' :: Int
n' = Int
n forall a. Num a => a -> a -> a
+ Int
1
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
siz' forall a. Ord a => a -> a -> Bool
> Int
headerFragmentLimit) forall a b. (a -> b) -> a -> b
$
          forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
EnhanceYourCalm ByteString
"Header is too big"
        forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int
n' forall a. Ord a => a -> a -> Bool
> Int
continuationLimit) forall a b. (a -> b) -> a -> b
$
          forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
EnhanceYourCalm ByteString
"Header is too fragmented"
        if Bool
endOfHeader then do
            let hdrblk :: ByteString
hdrblk = [ByteString] -> ByteString
BS.concat forall a b. (a -> b) -> a -> b
$ forall a. [a] -> [a]
reverse [ByteString]
rfrags'
            (TokenHeaderList, ValueTable)
tbl <- ByteString -> Context -> IO (TokenHeaderList, ValueTable)
hpackDecodeHeader ByteString
hdrblk Context
ctx
            forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ if Bool
endOfStream then
                        OpenState -> StreamState
Open ((TokenHeaderList, ValueTable) -> OpenState
NoBody (TokenHeaderList, ValueTable)
tbl)
                       else
                        OpenState -> StreamState
Open ((TokenHeaderList, ValueTable) -> OpenState
HasBody (TokenHeaderList, ValueTable)
tbl)
          else
            forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ OpenState -> StreamState
Open forall a b. (a -> b) -> a -> b
$ [ByteString] -> Int -> Int -> Bool -> OpenState
Continued [ByteString]
rfrags' Int
siz' Int
n' Bool
endOfStream

stream FrameTypeId
FrameWindowUpdate header :: FrameHeader
header@FrameHeader{Int
streamId :: Int
streamId :: FrameHeader -> Int
streamId} ByteString
bs Context
_ StreamState
s Stream{TVar Int
streamWindow :: Stream -> TVar Int
streamWindow :: TVar Int
streamWindow} = do
    WindowUpdateFrame Int
n <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodeWindowUpdateFrame FrameHeader
header ByteString
bs
    Int
w <- forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ do
      Int
w0 <- forall a. TVar a -> STM a
readTVar TVar Int
streamWindow
      let w1 :: Int
w1 = Int
w0 forall a. Num a => a -> a -> a
+ Int
n
      forall a. TVar a -> a -> STM ()
writeTVar TVar Int
streamWindow Int
w1
      forall (m :: * -> *) a. Monad m => a -> m a
return Int
w1
    forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (Int -> Bool
isWindowOverflow Int
w) forall a b. (a -> b) -> a -> b
$ forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
FlowControlError Int
streamId
    forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s

stream FrameTypeId
FrameRSTStream FrameHeader
header ByteString
bs Context
ctx StreamState
_ Stream
strm = do
    RSTStreamFrame ErrorCodeId
e <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decoderstStreamFrame FrameHeader
header ByteString
bs
    let cc :: ClosedCode
cc = ErrorCodeId -> ClosedCode
Reset ErrorCodeId
e
    Context -> Stream -> ClosedCode -> IO ()
closed Context
ctx Stream
strm ClosedCode
cc
    forall (m :: * -> *) a. Monad m => a -> m a
return forall a b. (a -> b) -> a -> b
$ ClosedCode -> StreamState
Closed ClosedCode
cc -- will be written to streamState again

stream FrameTypeId
FramePriority FrameHeader
header ByteString
bs Context
_ StreamState
s Stream{Int
streamNumber :: Int
streamNumber :: Stream -> Int
streamNumber} = do
    -- ignore
    -- Resource Loop - CVE-2019-9513
    PriorityFrame Priority
newpri <- forall a. Either HTTP2Error a -> IO a
guardIt forall a b. (a -> b) -> a -> b
$ FramePayloadDecoder
decodePriorityFrame FrameHeader
header ByteString
bs
    Priority -> Int -> IO ()
checkPriority Priority
newpri Int
streamNumber
    forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
s

-- this ordering is important
stream FrameTypeId
FrameContinuation FrameHeader
_ ByteString
_ Context
_ StreamState
_ Stream
_ = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"continue frame cannot come here"
stream FrameTypeId
_ FrameHeader
_ ByteString
_ Context
_ (Open Continued{}) Stream
_ = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> ByteString -> HTTP2Error
ConnectionError ErrorCodeId
ProtocolError ByteString
"an illegal frame follows header/continuation frames"
-- Ignore frames to streams we have just reset, per section 5.1.
stream FrameTypeId
_ FrameHeader
_ ByteString
_ Context
_ st :: StreamState
st@(Closed (ResetByMe SomeException
_)) Stream
_ = forall (m :: * -> *) a. Monad m => a -> m a
return StreamState
st
stream FrameTypeId
FrameData FrameHeader{Int
streamId :: Int
streamId :: FrameHeader -> Int
streamId} ByteString
_ Context
_ StreamState
_ Stream
_ = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
StreamClosed Int
streamId
stream FrameTypeId
_ FrameHeader{Int
streamId :: Int
streamId :: FrameHeader -> Int
streamId} ByteString
_ Context
_ StreamState
_ Stream
_ = forall e a. Exception e => e -> IO a
E.throwIO forall a b. (a -> b) -> a -> b
$ ErrorCodeId -> Int -> HTTP2Error
StreamError ErrorCodeId
ProtocolError Int
streamId

----------------------------------------------------------------

-- | Type for input streaming.
data Source = Source (Int -> IO ())
                     (TQueue ByteString)
                     (IORef ByteString)
                     (IORef Bool)

mkSource :: (Int -> IO ()) -> TQueue ByteString -> IO Source
mkSource :: (Int -> IO ()) -> TQueue ByteString -> IO Source
mkSource Int -> IO ()
update TQueue ByteString
q = (Int -> IO ())
-> TQueue ByteString -> IORef ByteString -> IORef Bool -> Source
Source Int -> IO ()
update TQueue ByteString
q forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
<$> forall a. a -> IO (IORef a)
newIORef ByteString
"" forall (f :: * -> *) a b. Applicative f => f (a -> b) -> f a -> f b
<*> forall a. a -> IO (IORef a)
newIORef Bool
False

updateWindow :: TQueue Control -> StreamId -> Int -> IO ()
updateWindow :: TQueue Control -> Int -> Int -> IO ()
updateWindow TQueue Control
_        Int
_   Int
0   = forall (m :: * -> *) a. Monad m => a -> m a
return ()
updateWindow TQueue Control
controlQ Int
sid Int
len = TQueue Control -> Control -> IO ()
enqueueControl TQueue Control
controlQ forall a b. (a -> b) -> a -> b
$ ByteString -> Control
CFrame ByteString
frame
  where
    frame1 :: ByteString
frame1 = Int -> Int -> ByteString
windowUpdateFrame Int
0 Int
len
    frame2 :: ByteString
frame2 = Int -> Int -> ByteString
windowUpdateFrame Int
sid Int
len
    frame :: ByteString
frame = ByteString
frame1 ByteString -> ByteString -> ByteString
`BS.append` ByteString
frame2

readSource :: Source -> IO ByteString
readSource :: Source -> InpBody
readSource (Source Int -> IO ()
update TQueue ByteString
q IORef ByteString
refBS IORef Bool
refEOF) = do
    Bool
eof <- forall a. IORef a -> IO a
readIORef IORef Bool
refEOF
    if Bool
eof then
        forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
""
      else do
        ByteString
bs <- InpBody
readBS
        let len :: Int
len = ByteString -> Int
BS.length ByteString
bs
        Int -> IO ()
update Int
len
        forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
bs
  where
    readBS :: InpBody
readBS = do
        ByteString
bs0 <- forall a. IORef a -> IO a
readIORef IORef ByteString
refBS
        if ByteString
bs0 forall a. Eq a => a -> a -> Bool
== ByteString
"" then do
            ByteString
bs <- forall a. STM a -> IO a
atomically forall a b. (a -> b) -> a -> b
$ forall a. TQueue a -> STM a
readTQueue TQueue ByteString
q
            forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when (ByteString
bs forall a. Eq a => a -> a -> Bool
== ByteString
"") forall a b. (a -> b) -> a -> b
$ forall a. IORef a -> a -> IO ()
writeIORef IORef Bool
refEOF Bool
True
            forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
bs
          else do
            forall a. IORef a -> a -> IO ()
writeIORef IORef ByteString
refBS ByteString
""
            forall (m :: * -> *) a. Monad m => a -> m a
return ByteString
bs0