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|
-- |
-- Copyright : (c) Sam Truzjan 2013
-- License : BSD3
-- Maintainer : pxqr.sta@gmail.com
-- Stability : experimental
-- Portability : portable
--
-- 'PeerAddr' is used to represent peer address. Currently it's
-- just peer IP and peer port but this might change in future.
--
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE DeriveDataTypeable #-}
{-# OPTIONS -fno-warn-orphans #-} -- for PortNumber instances
module Network.BitTorrent.Core.PeerAddr
( -- * Peer address
PeerAddr(..)
, defaultPorts
, peerSockAddr
, connectToPeer
) where
import Control.Applicative
import Data.Aeson (ToJSON, FromJSON)
import Data.Aeson.TH
import Data.BEncode as BS
import Data.Bits
import Data.Char
import Data.List as L
import Data.Serialize as S
import Data.Typeable
import Data.Word
import Network.Socket
import Text.PrettyPrint
import Text.PrettyPrint.Class
import Network.BitTorrent.Core.PeerId
deriving instance ToJSON PortNumber
deriving instance FromJSON PortNumber
instance BEncode PortNumber where
toBEncode = toBEncode . fromEnum
fromBEncode b = toEnum <$> fromBEncode b
instance Serialize PortNumber where
get = fromIntegral <$> getWord16be
{-# INLINE get #-}
put = putWord16be . fromIntegral
{-# INLINE put #-}
-- TODO check semantic of ord and eq instances
-- TODO use SockAddr instead of peerIP and peerPort
-- | Peer address info normally extracted from peer list or peer
-- compact list encoding.
data PeerAddr = PeerAddr {
peerID :: !(Maybe PeerId)
, peerIP :: {-# UNPACK #-} !HostAddress
, peerPort :: {-# UNPACK #-} !PortNumber
} deriving (Show, Eq, Ord, Typeable)
$(deriveJSON defaultOptions { fieldLabelModifier = (L.map toLower . L.dropWhile isLower) } ''PeerAddr)
-- | The tracker "announce query" compatible encoding.
instance BEncode PeerAddr where
toBEncode (PeerAddr pid pip pport) = toDict $
"peer id" .=? pid
.: "ip" .=! pip
.: "port" .=! pport
.: endDict
fromBEncode = fromDict $ do
PeerAddr <$>? "peer id"
<*>! "ip"
<*>! "port"
-- | The tracker "compact peer list" compatible encoding. The
-- 'peerId' is always 'Nothing'.
--
-- For more info see: <http://www.bittorrent.org/beps/bep_0023.html>
--
instance Serialize PeerAddr where
put PeerAddr {..} = put peerID >> put peerPort
{-# INLINE put #-}
get = PeerAddr Nothing <$> get <*> get
{-# INLINE get #-}
instance Pretty PeerAddr where
pretty p @ PeerAddr {..}
| Just pid <- peerID = pretty (clientInfo pid) <+> "at" <+> paddr
| otherwise = paddr
where
paddr = text (show (peerSockAddr p))
-- | Ports typically reserved for bittorrent P2P listener.
defaultPorts :: [PortNumber]
defaultPorts = [6881..6889]
-- TODO make platform independent, clarify htonl
-- | Convert peer info from tracker response to socket address. Used
-- for establish connection between peers.
--
peerSockAddr :: PeerAddr -> SockAddr
peerSockAddr = SockAddrInet <$> (g . peerPort) <*> (htonl . peerIP)
where
htonl :: Word32 -> Word32
htonl d =
((d .&. 0xff) `shiftL` 24) .|.
(((d `shiftR` 8 ) .&. 0xff) `shiftL` 16) .|.
(((d `shiftR` 16) .&. 0xff) `shiftL` 8) .|.
((d `shiftR` 24) .&. 0xff)
g :: PortNumber -> PortNumber
g = id
-- | Tries to connect to peer using reasonable default parameters.
connectToPeer :: PeerAddr -> IO Socket
connectToPeer p = do
sock <- socket AF_INET Stream Network.Socket.defaultProtocol
connect sock (peerSockAddr p)
return sock
|
