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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 #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE ViewPatterns #-}
{-# OPTIONS -fno-warn-orphans #-} -- for PortNumber instances
module Network.BitTorrent.Core.PeerAddr
( -- * Peer address
PeerAddr(..)
, defaultPorts
, peerSockAddr
-- * IP
, mergeIPLists
, splitIPList
, IPAddress ()
) where
import Control.Applicative
import Control.Monad
import Data.Aeson (ToJSON, FromJSON)
import Data.BEncode as BS
import Data.BEncode.BDict (BKey)
import Data.ByteString.Char8 as BS8
import Data.Char
import Data.Default
import Data.Either
import Data.Foldable
import Data.IP
import Data.List as L
import Data.List.Split
import Data.Serialize as S
import Data.String
import Data.Typeable
import Data.Word
import Network.Socket
import Text.PrettyPrint
import Text.PrettyPrint.Class
import Text.Read (readMaybe)
import qualified Text.ParserCombinators.ReadP as RP
import Network.BitTorrent.Core.PeerId
{-----------------------------------------------------------------------
-- Port number
-----------------------------------------------------------------------}
deriving instance ToJSON PortNumber
deriving instance FromJSON PortNumber
instance BEncode PortNumber where
toBEncode = toBEncode . fromEnum
fromBEncode = fromBEncode >=> portNumber
where
portNumber :: Integer -> BS.Result PortNumber
portNumber n
| 0 <= n && n <= fromIntegral (maxBound :: Word16)
= pure $ fromIntegral n
| otherwise = decodingError $ "PortNumber: " ++ show n
instance Serialize PortNumber where
get = fromIntegral <$> getWord16be
{-# INLINE get #-}
put = putWord16be . fromIntegral
{-# INLINE put #-}
{-----------------------------------------------------------------------
-- IP addr
-----------------------------------------------------------------------}
class IPAddress i where
toHostAddr :: i -> Either HostAddress HostAddress6
instance IPAddress IPv4 where
toHostAddr = Left . toHostAddress
instance IPAddress IPv6 where
toHostAddr = Right . toHostAddress6
instance IPAddress IP where
toHostAddr (IPv4 ip) = toHostAddr ip
toHostAddr (IPv6 ip) = toHostAddr ip
deriving instance Typeable IP
deriving instance Typeable IPv4
deriving instance Typeable IPv6
ipToBEncode :: Show i => i -> BValue
ipToBEncode ip = BString $ BS8.pack $ show ip
ipFromBEncode :: Read a => BValue -> BS.Result a
ipFromBEncode (BString (BS8.unpack -> ipStr))
| Just ip <- readMaybe (ipStr) = pure ip
| otherwise = decodingError $ "IP: " ++ ipStr
ipFromBEncode _ = decodingError $ "IP: addr should be a bstring"
instance BEncode IP where
toBEncode = ipToBEncode
fromBEncode = ipFromBEncode
instance BEncode IPv4 where
toBEncode = ipToBEncode
fromBEncode = ipFromBEncode
instance BEncode IPv6 where
toBEncode = ipToBEncode
fromBEncode = ipFromBEncode
instance Serialize IPv4 where
put = putWord32host . toHostAddress
get = fromHostAddress <$> getWord32host
instance Serialize IPv6 where
put ip = put $ toHostAddress6 ip
get = fromHostAddress6 <$> get
{-----------------------------------------------------------------------
-- Peer addr
-----------------------------------------------------------------------}
-- TODO check semantic of ord and eq instances
-- | Peer address info normally extracted from peer list or peer
-- compact list encoding.
data PeerAddr a = PeerAddr
{ peerId :: !(Maybe PeerId)
, peerHost :: !a
, peerPort :: {-# UNPACK #-} !PortNumber
} deriving (Show, Eq, Typeable, Functor)
peer_ip_key, peer_id_key, peer_port_key :: BKey
peer_ip_key = "ip"
peer_id_key = "peer id"
peer_port_key = "port"
-- | The tracker's 'announce response' compatible encoding.
instance (Typeable a, BEncode a) => BEncode (PeerAddr a) where
toBEncode PeerAddr {..} = toDict $
peer_ip_key .=! peerHost
.: peer_id_key .=? peerId
.: peer_port_key .=! peerPort
.: endDict
fromBEncode = fromDict $ do
peerAddr <$>! peer_ip_key
<*>? peer_id_key
<*>! peer_port_key
where
peerAddr = flip PeerAddr
mergeIPLists :: [PeerAddr IPv4] -> Maybe [PeerAddr IPv6] -> [PeerAddr IP]
mergeIPLists v4 v6 = (fmap IPv4 `L.map` v4)
++ (fmap IPv6 `L.map` Data.Foldable.concat v6)
splitIPList :: [PeerAddr IP] -> ([PeerAddr IPv4],[PeerAddr IPv6])
splitIPList xs = partitionEithers $ toEither <$> xs
where
toEither :: PeerAddr IP -> Either (PeerAddr IPv4) (PeerAddr IPv6)
toEither pa@(PeerAddr _ (IPv4 _) _) = Left (ipv4 <$> pa)
toEither pa@(PeerAddr _ (IPv6 _) _) = Right (ipv6 <$> pa)
-- | The tracker's 'compact peer list' compatible encoding. The
-- 'peerId' is always 'Nothing'.
--
-- For more info see: <http://www.bittorrent.org/beps/bep_0023.html>
--
-- TODO: test byte order
instance (Serialize a) => Serialize (PeerAddr a) where
put PeerAddr {..} = put peerHost >> put peerPort
get = PeerAddr Nothing <$> get <*> get
-- | @127.0.0.1:6881@
instance Default (PeerAddr IPv4) where
def = "127.0.0.1:6881"
-- | Example:
--
-- @peerPort \"127.0.0.1:6881\" == 6881@
--
instance IsString (PeerAddr IPv4) where
fromString str
| [hostAddrStr, portStr] <- splitWhen (== ':') str
, Just hostAddr <- readMaybe hostAddrStr
, Just portNum <- toEnum <$> readMaybe portStr
= PeerAddr Nothing hostAddr portNum
| otherwise = error $ "fromString: unable to parse (PeerAddr IPv4): " ++ str
readsIPv6_port :: String -> [((IPv6, PortNumber), String)]
readsIPv6_port = RP.readP_to_S $ do
ip <- RP.char '[' *> (RP.readS_to_P reads) <* RP.char ']'
_ <- RP.char ':'
port <- toEnum <$> read <$> (RP.many1 $ RP.satisfy isDigit) <* RP.eof
return (ip,port)
instance IsString (PeerAddr IPv6) where
fromString str
| [((ip,port),"")] <- readsIPv6_port str =
PeerAddr Nothing ip port
| otherwise = error $ "fromString: unable to parse (PeerAddr IPv6): " ++ str
instance IsString (PeerAddr IP) where
fromString str
| '[' `L.elem` str = IPv6 <$> fromString str
| otherwise = IPv4 <$> fromString str
-- | fingerprint + "at" + dotted.host.inet.addr:port
-- TODO: instances for IPv6, HostName
instance Pretty a => Pretty (PeerAddr a) where
pretty PeerAddr {..}
| Just pid <- peerId = pretty (fingerprint pid) <+> "at" <+> paddr
| otherwise = paddr
where
paddr = pretty peerHost <> ":" <> text (show peerPort)
-- | Ports typically reserved for bittorrent P2P listener.
defaultPorts :: [PortNumber]
defaultPorts = [6881..6889]
_resolvePeerAddr :: (IPAddress i) => PeerAddr HostName -> PeerAddr i
_resolvePeerAddr = undefined
-- | Convert peer info from tracker response to socket address. Used
-- for establish connection between peers.
--
peerSockAddr :: PeerAddr IP -> SockAddr
peerSockAddr PeerAddr {..} =
case peerHost of
IPv4 ipv4 -> SockAddrInet peerPort (toHostAddress ipv4)
IPv6 ipv6 -> SockAddrInet6 peerPort 0 (toHostAddress6 ipv6) 0
|
