{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications #-}
import Network.Socks5
import Network.Socket hiding (recv, close)
import Network.Socket.ByteString
import Network.Socket (close)
import Network.BSD
import Data.ByteString.Char8 ()
import qualified Data.ByteString.Char8 as BC

import System.IO (hClose, hFlush)
import System.Environment (getArgs)

main = do
    args <- getArgs
    let serverName = "localhost"
    let serverPort = 1080
    let destinationName = case args of
            []    -> "www.google.com"
            (x:_) -> x
    -- socks server is expected to be running on localhost port 1080
    he     <- getHostByName serverName
    let socksServerAddr = SockAddrInet serverPort (head $ hostAddresses he)

    example1 socksServerAddr destinationName
    example2 socksServerAddr destinationName

  where
        -- connect to @destName on port 80 through the socks server
        -- www.google.com get resolve on the client here and then the sockaddr is
        -- passed to socksConnectAddr
        example1 socksServerAddr destName = do
            (socket, _) <- socksConnect (defaultSocksConf socksServerAddr)
                        (SocksAddress (SocksAddrDomainName $ BC.pack destName) 80)

            sendAll socket "GET / HTTP/1.0\r\n\r\n"
            recv socket 4096 >>= putStrLn . show
            close socket
        -- connect to @destName on port 80 through the socks server
        -- the server is doing the resolution itself
        example2 socksServerAddr destName = do
            socket <- socket AF_INET Stream defaultProtocol
            socksConnectName socket (defaultSocksConf socksServerAddr) destName 80
            sendAll socket "GET / HTTP/1.0\r\n\r\n"
            recv socket 4096 >>= putStrLn . show
            close socket