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-- |
-- Copyright : (c) Sam T. 2013
-- License : MIT
-- Maintainer : pxqr.sta@gmail.com
-- Stability : experimental
-- Portability : non-portable
--
module Network.BitTorrent.Peer
( Peer(..)
, peerSockAddr, connectToPeer
, ppPeer
) where
import Control.Applicative
import Data.Word
import Data.Bits
import Network
import Network.Socket
import Network.BitTorrent.PeerID
import Network.BitTorrent.PeerWire.ClientInfo
data Peer = Peer {
peerID :: Maybe PeerID
, peerIP :: HostAddress
, peerPort :: PortNumber
} deriving Show
-- TODO make platform independent, clarify htonl
-- | Convert peer info from tracker response to socket address.
-- Used for establish connection between peers.
--
peerSockAddr :: Peer -> SockAddr
peerSockAddr = SockAddrInet <$> (g . peerPort) <*> (htonl . peerIP)
where
htonl :: Word32 -> Word32
htonl d =
((d .&. 0xff) `shiftL` 24) .|.
(((d `shiftR` 8 ) .&. 0xff) `shiftL` 16) .|.
(((d `shiftR` 16) .&. 0xff) `shiftL` 8) .|.
((d `shiftR` 24) .&. 0xff)
g :: PortNumber -> PortNumber
g = id
-- | Tries to connect to peer using reasonable default parameters.
connectToPeer :: Peer -> IO Socket
connectToPeer p = do
sock <- socket AF_INET Stream Network.Socket.defaultProtocol
connect sock (peerSockAddr p)
return sock
ppPeer :: Peer -> String
ppPeer p = maybe "" (++ " at ") ((ppClientInfo . clientInfo) <$> peerID p)
++ show (peerSockAddr p)
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