From: Ramakrishnan Muthukrishnan Date: Fri, 1 May 2015 10:20:21 +0000 (+0530) Subject: WIP: peer handshake X-Git-Url: https://git.rkrishnan.org/%5B/%5D%20/file/URI:LIT:krugkidfnzsc4/@@named=/frontends/nxhtml.html?a=commitdiff_plain;h=b236b7f5a4b065e7b61bdd5966431dc51f450b41;p=functorrent.git WIP: peer handshake --- diff --git a/src/FuncTorrent.hs b/src/FuncTorrent.hs index e17b024..8289da5 100644 --- a/src/FuncTorrent.hs +++ b/src/FuncTorrent.hs @@ -7,7 +7,7 @@ module FuncTorrent tracker, decode, encode, - handShakeMsg, + handShake, initLogger, logMessage, logStop, diff --git a/src/FuncTorrent/Peer.hs b/src/FuncTorrent/Peer.hs index b0c546b..798f60a 100644 --- a/src/FuncTorrent/Peer.hs +++ b/src/FuncTorrent/Peer.hs @@ -1,26 +1,59 @@ {-# LANGUAGE OverloadedStrings #-} module FuncTorrent.Peer (Peer(..), - handShakeMsg + handShake ) where import Prelude hiding (lookup, concat, replicate, splitAt) -import Data.ByteString.Char8 (ByteString, pack, concat, replicate) -import Data.ByteString.Lazy (toChunks) -import Data.Int (Int8) -import qualified Data.Binary as Bin (encode) +import System.IO +import Data.ByteString (ByteString, unpack, concat, hGet, hPut, singleton) +import Data.ByteString.Char8 (replicate, pack) +import Network (connectTo, PortID(..)) -import FuncTorrent.Metainfo (Metainfo(..)) +type ID = String +type IP = String +type Port = Integer --- | Peer is a IP address, port tuple -data Peer = Peer String Integer - deriving (Show, Eq) +data PeerState = PeerState { am_choking :: Bool + , am_interested :: Bool + , peer_choking :: Bool + , peer_interested :: Bool } -handShakeMsg :: Metainfo -> String -> ByteString -handShakeMsg m peer_id = concat [pstrlen, pstr, reserved, infoH, peerID] - where pstrlen = concat $ toChunks $ Bin.encode (19 :: Int8) - pstr = pack "BitTorrent protocol" - reserved = replicate 8 '\0' - infoH = infoHash m - peerID = pack peer_id +-- | Peer is a PeerID, IP address, port tuple +data Peer = Peer ID IP Port + deriving (Show, Eq) + +data Msg = HandShakeMsg ByteString ID + | KeepAliveMsg + | ChokeMsg + | UnChokeMsg + | InterestedMsg + | NotInterestedMsg + | HaveMsg Integer + | BitFieldMsg Integer + | RequestMsg Integer Integer Integer + | PieceMsg Integer Integer Integer + | CancelMsg Integer Integer Integer + | PortMsg Port + deriving (Show) + +genHandShakeMsg :: ByteString -> String -> ByteString +genHandShakeMsg infoHash peer_id = concat [pstrlen, pstr, reserved, infoHash, peerID] + where pstrlen = singleton 19 + pstr = pack "BitTorrent protocol" + reserved = replicate 8 '\0' + peerID = pack peer_id + +handShake :: Peer -> ByteString -> String -> IO ByteString +handShake (Peer _ ip port) infoHash peerid = do + let hs = genHandShakeMsg infoHash peerid + handle <- connectTo ip (PortNumber (fromIntegral port)) + hSetBuffering handle LineBuffering + hPut handle hs + rlenBS <- hGet handle 1 + let rlen = fromIntegral $ (unpack rlenBS) !! 0 + hGet handle rlen + +-- sendMsg :: Peer -> Handle -> PeerMsg -> IO () +-- recvMsg :: Peer -> Handle -> Msg diff --git a/src/FuncTorrent/Tracker.hs b/src/FuncTorrent/Tracker.hs index 57c8f9d..b816650 100644 --- a/src/FuncTorrent/Tracker.hs +++ b/src/FuncTorrent/Tracker.hs @@ -62,7 +62,7 @@ mkTrackerResponse resp = splitN 2 . B16.encode makePeer :: ByteString -> Peer - makePeer peer = Peer (toIP ip') (toPort port') + makePeer peer = Peer "" (toIP ip') (toPort port') where (ip', port') = splitAt 4 peer -- | Connect to a tracker and get peer info diff --git a/src/Main.hs b/src/Main.hs index 9cb5908..fa79ac3 100644 --- a/src/Main.hs +++ b/src/Main.hs @@ -2,7 +2,7 @@ module Main where import Prelude hiding (log, length, readFile, writeFile) -import Data.ByteString.Char8 (ByteString, readFile, writeFile, length, unpack) +import Data.ByteString.Char8 (ByteString, readFile, writeFile, unpack) import System.Environment (getArgs) import System.Exit (exitSuccess) import System.Directory (doesFileExist) @@ -11,7 +11,7 @@ import Text.ParserCombinators.Parsec (ParseError) import FuncTorrent.Bencode (decode) import FuncTorrent.Logger (initLogger, logMessage, logStop) import FuncTorrent.Metainfo (Info(..), Metainfo(..), mkMetaInfo) -import FuncTorrent.Peer (handShakeMsg) +import FuncTorrent.Peer (Peer(..), handShake) import FuncTorrent.Tracker (tracker, peers, mkTrackerResponse) logError :: ParseError -> (String -> IO ()) -> IO () @@ -55,17 +55,18 @@ main = do log $ "Trackers: " ++ head (announceList m) response <- tracker m peerId - let hsMsgLen = show $ length $ handShakeMsg m peerId - log $ "Hand-shake message length : " ++ hsMsgLen - -- TODO: Write to ~/.functorrent/caches writeFile (name (info m) ++ ".cache") response case decode response of Right trackerInfo -> case mkTrackerResponse trackerInfo of - Right peerResp -> + Right peerResp -> do log $ "Peers List : " ++ (show . peers $ peerResp) + let p1 = head (peers peerResp) + msg <- handShake (Peer "" "95.188.88.59" 27000) (infoHash m) peerId + log $ "handshake: " ++ (show msg) + return () Left e -> log $ "Error" ++ unpack e Left e -> logError e log