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{-# LANGUAGE BangPatterns #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE CPP #-}
{-# OPTIONS_GHC -fno-warn-deprecations #-}
module Network.Wai.Handler.Warp.Request (
recvRequest
, headerLines
) where
import qualified Control.Concurrent as Conc (yield)
import Control.Exception (throwIO)
import Data.Array ((!))
import Data.ByteString (ByteString)
import qualified Data.ByteString as S
import qualified Data.ByteString.Unsafe as SU
import qualified Data.CaseInsensitive as CI
import qualified Data.IORef as I
import Data.Monoid (mempty)
import qualified Network.HTTP.Types as H
import Network.Socket (SockAddr)
import Network.Wai
import Network.Wai.Handler.Warp.Conduit
import Network.Wai.Handler.Warp.Header
import Network.Wai.Handler.Warp.ReadInt
import Network.Wai.Handler.Warp.RequestHeader
import Network.Wai.Handler.Warp.Settings (Settings, settingsNoParsePath)
import qualified Network.Wai.Handler.Warp.Timeout as Timeout
import Network.Wai.Handler.Warp.Types
import Network.Wai.Internal
import Prelude hiding (lines)
import Control.Monad (when)
----------------------------------------------------------------
-- FIXME come up with good values here
maxTotalHeaderLength :: Int
maxTotalHeaderLength = 50 * 1024
----------------------------------------------------------------
-- | Receiving a HTTP request from 'Connection' and parsing its header
-- to create 'Request'.
recvRequest :: Settings
-> Connection
-> InternalInfo
-> SockAddr -- ^ Peer's address.
-> Source -- ^ Where HTTP request comes from.
-> IO (Request
,IndexedHeader) -- ^
-- 'Request' passed to 'Application',
-- 'IndexedHeader' of HTTP request for internal use,
recvRequest settings conn ii addr src = do
hdrlines <- headerLines src
(method, unparsedPath, path, query, httpversion, hdr) <- parseHeaderLines hdrlines
let idxhdr = indexRequestHeader hdr
expect = idxhdr ! idxExpect
cl = idxhdr ! idxContentLength
te = idxhdr ! idxTransferEncoding
handleExpect conn httpversion expect
(rbody, bodyLength) <- bodyAndSource src cl te
rbody' <- timeoutBody th rbody
let req = Request {
requestMethod = method
, httpVersion = httpversion
, pathInfo = H.decodePathSegments path
, rawPathInfo = if settingsNoParsePath settings then unparsedPath else path
, rawQueryString = query
, queryString = H.parseQuery query
, requestHeaders = hdr
, isSecure = False
, remoteHost = addr
, requestBody = rbody'
, vault = mempty
, requestBodyLength = bodyLength
, requestHeaderHost = idxhdr ! idxHost
, requestHeaderRange = idxhdr ! idxRange
}
return (req, idxhdr)
where
th = threadHandle ii
----------------------------------------------------------------
headerLines :: Source -> IO [ByteString]
headerLines src = do
bs <- readSource src
if S.null bs
then throwIO $ NotEnoughLines []
else push src (THStatus 0 id id) bs
----------------------------------------------------------------
handleExpect :: Connection
-> H.HttpVersion
-> Maybe HeaderValue
-> IO ()
handleExpect conn ver (Just "100-continue") = do
connSendAll conn continue
Conc.yield
where
continue
| ver == H.http11 = "HTTP/1.1 100 Continue\r\n\r\n"
| otherwise = "HTTP/1.0 100 Continue\r\n\r\n"
handleExpect _ _ _ = return ()
----------------------------------------------------------------
bodyAndSource :: Source
-> Maybe HeaderValue -- ^ content length
-> Maybe HeaderValue -- ^ transfer-encoding
-> IO (IO ByteString
,RequestBodyLength
)
bodyAndSource src cl te
| chunked = do
csrc <- mkCSource src
return (readCSource csrc, ChunkedBody)
| otherwise = do
isrc <- mkISource src len
return (readISource isrc, bodyLen)
where
len = toLength cl
bodyLen = KnownLength $ fromIntegral len
chunked = isChunked te
toLength :: Maybe HeaderValue -> Int
toLength Nothing = 0
toLength (Just bs) = readInt bs
isChunked :: Maybe HeaderValue -> Bool
isChunked (Just bs) = CI.foldCase bs == "chunked"
isChunked _ = False
----------------------------------------------------------------
timeoutBody :: Timeout.Handle -> IO ByteString -> IO (IO ByteString)
timeoutBody timeoutHandle rbody = do
isFirstRef <- I.newIORef True
return $ do
isFirst <- I.readIORef isFirstRef
when isFirst $
-- Timeout handling was paused after receiving the full request
-- headers. Now we need to resume it to avoid a slowloris
-- attack during request body sending.
Timeout.resume timeoutHandle
bs <- rbody
-- As soon as we finish receiving the request body, whether
-- because the application is not interested in more bytes, or
-- because there is no more data available, pause the timeout
-- handler again.
when (S.null bs) (Timeout.pause timeoutHandle)
return bs
----------------------------------------------------------------
type BSEndo = ByteString -> ByteString
type BSEndoList = [ByteString] -> [ByteString]
data THStatus = THStatus
{-# UNPACK #-} !Int -- running total byte count
BSEndoList -- previously parsed lines
BSEndo -- bytestrings to be prepended
----------------------------------------------------------------
{- FIXME
close :: Sink ByteString IO a
close = throwIO IncompleteHeaders
-}
push :: Source -> THStatus -> ByteString -> IO [ByteString]
push src (THStatus len lines prepend) bs'
-- Too many bytes
| len > maxTotalHeaderLength = throwIO OverLargeHeader
| otherwise = push' mnl
where
bs = prepend bs'
bsLen = S.length bs
mnl = do
nl <- S.elemIndex 10 bs
-- check if there are two more bytes in the bs
-- if so, see if the second of those is a horizontal space
if bsLen > nl + 1 then
let c = S.index bs (nl + 1)
b = case nl of
0 -> True
1 -> S.index bs 0 == 13
_ -> False
in Just (nl, not b && (c == 32 || c == 9))
else
Just (nl, False)
{-# INLINE push' #-}
push' :: Maybe (Int, Bool) -> IO [ByteString]
-- No newline find in this chunk. Add it to the prepend,
-- update the length, and continue processing.
push' Nothing = do
bst <- readSource' src
when (S.null bs) $ throwIO IncompleteHeaders
push src status bst
where
len' = len + bsLen
prepend' = S.append bs
status = THStatus len' lines prepend'
-- Found a newline, but next line continues as a multiline header
push' (Just (end, True)) = push src status rest
where
rest = S.drop (end + 1) bs
prepend' = S.append (SU.unsafeTake (checkCR bs end) bs)
len' = len + end
status = THStatus len' lines prepend'
-- Found a newline at position end.
push' (Just (end, False))
-- leftover
| S.null line = do
when (start < bsLen) $ leftoverSource src (SU.unsafeDrop start bs)
return (lines [])
-- more headers
| otherwise = let len' = len + start
lines' = lines . (line:)
status = THStatus len' lines' id
in if start < bsLen then
-- more bytes in this chunk, push again
let bs'' = SU.unsafeDrop start bs
in push src status bs''
else do
-- no more bytes in this chunk, ask for more
bst <- readSource' src
when (S.null bs) $ throwIO IncompleteHeaders
push src status bst
where
start = end + 1 -- start of next chunk
line = SU.unsafeTake (checkCR bs end) bs
{-# INLINE checkCR #-}
checkCR :: ByteString -> Int -> Int
checkCR bs pos = if 13 == S.index bs p then p else pos -- 13 is CR
where
!p = pos - 1
|
