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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 #-}
{-# OPTIONS -fno-warn-orphans #-} -- for PortNumber instances
module Network.BitTorrent.Core.PeerAddr
( -- * Peer address
PeerAddr(..)
, defaultPorts
, peerSockAddr
-- * IP
, mergeIPLists
, splitIPList
, IP, IPv4, IPv6 --re-export Data.IP constructors
, IPAddress ()
) where
import Control.Applicative
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.List as L
import Data.List.Split
import Data.Serialize as S
import Data.String
import Data.Typeable
import Data.IP
import Data.Foldable
import Data.Either
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
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 #-}
class (Show i, Read i) => IPAddress i where
showIp :: i -> String
showIp = show
readIp :: String -> i
readIp = read
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 :: IPAddress i => i -> BValue
ipToBEncode ip = BString $ BS8.pack $ showIp ip
ipFromBEncode :: Monad m => IPAddress a => BValue -> m a
ipFromBEncode (BString ip) = return $ readIp $ BS8.unpack ip
ipFromBEncode _ = fail "ipFromBEncode"
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 ip = put $ toHostAddress ip
get = fromHostAddress <$> get
instance Serialize IPv6 where
put ip = put $ toHostAddress6 ip
get = fromHostAddress6 <$> get
-- 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)
, peerAddr :: a
, peerPort :: {-# UNPACK #-} !PortNumber
} deriving (Show, Eq, Typeable, Functor)
peer_id_key, peer_ip_key, peer_port_key :: BKey
peer_id_key = "peer id"
peer_ip_key = "ip"
peer_port_key = "port"
-- | The tracker's 'announce response' compatible encoding.
instance (Typeable a, BEncode a) => BEncode (PeerAddr a) where
toBEncode PeerAddr {..} = toDict $
peer_id_key .=? peerId
.: peer_ip_key .=! peerAddr
.: peer_port_key .=! peerPort
.: endDict
fromBEncode = fromDict $ do
PeerAddr <$>? peer_id_key
<*>! peer_ip_key
<*>! peer_port_key
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 <$> pa)
-- | The tracker's 'compact peer list' compatible encoding. The
-- 'peerId' is always 'Nothing'.
--
-- For more info see: <http://www.bittorrent.org/beps/bep_0023.html>
--
-- TODO: test byte order
instance (Serialize a) => Serialize (PeerAddr a) where
put PeerAddr {..} =
put peerAddr >> put peerPort
get =
PeerAddr Nothing <$> 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
, hostAddr <- read 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
-- | fingerprint + "at" + dotted.host.inet.addr:port
-- TODO: instances for IPv6, HostName
instance Pretty (PeerAddr IP) where
pretty PeerAddr {..}
| Just pid <- peerId = pretty (fingerprint pid) <+> "at" <+> paddr
| otherwise = paddr
where
paddr = text (show peerAddr ++ ":" ++ 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 :: (IPAddress i) => PeerAddr i -> SockAddr
peerSockAddr PeerAddr {..} =
case toHostAddr peerAddr of
Left host4 -> SockAddrInet peerPort host4
Right host6 -> SockAddrInet6 peerPort 0 host6 0
|
