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module Main where
import Control.Concurrent
import Control.Concurrent.STM
import Control.Monad
import Text.Regex.TDFA
import Text.Regex.TDFA.String
import System.Environment
import System.IO
import System.IO.Error
import System.Process
data Network = Network
{ netNodes :: MVar [(Int, Node)]
}
data Node = Node
{ nodeNetwork :: Network
, nodeName :: String
}
data Process = Process
{ procHandle :: ProcessHandle
, procNode :: Node
, procStdin :: Handle
, procOutput :: TVar [String]
}
initNetwork :: IO Network
initNetwork = do
callCommand "ip link add name br0 type bridge"
callCommand "ip addr add 192.168.0.1/24 broadcast 192.168.0.255 dev br0"
callCommand "ip link set dev br0 up"
callCommand "ip link set dev lo up"
Network <$> newMVar []
getNode :: Network -> Int -> IO Node
getNode net idx = (lookup idx <$> readMVar (netNodes net)) >>= \case
Just node -> return node
_ -> do
let name = "node" ++ show idx
node = Node { nodeNetwork = net
, nodeName = name
}
callCommand $ "ip netns add \""++ name ++ "\""
callCommand $ "ip link add \"veth" ++ show idx ++ ".0\" type veth peer name \"veth" ++ show idx ++ ".1\" netns \"" ++ name ++ "\""
callCommand $ "ip link set dev \"veth" ++ show idx ++ ".0\" master br0 up"
callOn node $ "ip addr add 192.168.0." ++ show (10 + idx) ++ "/24 broadcast 192.168.0.255 dev \"veth" ++ show idx ++ ".1\""
callOn node $ "ip link set dev \"veth" ++ show idx ++ ".1\" up"
callOn node $ "ip link set dev lo up"
modifyMVar_ (netNodes net) $ return . ((idx, node):)
return node
callOn :: Node -> String -> IO ()
callOn node cmd = callCommand $ "ip netns exec \"" ++ nodeName node ++ "\" " ++ cmd
spawnOn :: Node -> String -> IO Process
spawnOn node cmd = do
(Just hin, Just hout, Just herr, handle) <- createProcess (shell $ "ip netns exec \"" ++ nodeName node ++ "\" " ++ cmd)
{ std_in = CreatePipe, std_out = CreatePipe, std_err = CreatePipe }
out <- newTVarIO []
let readingLoop :: Handle -> (String -> IO ()) -> IO ()
readingLoop h act =
tryIOError (hGetLine h) >>= \case
Left err
| isEOFError err -> return ()
| otherwise -> putStrLn $ "\ESC[31m" ++ nodeName node ++ "!!> IO error: " ++ show err ++ "\ESC[0m"
Right line -> do
act line
readingLoop h act
void $ forkIO $ readingLoop hout $ \line -> do
putStrLn $ nodeName node ++ "> " ++ line
atomically $ modifyTVar out (++[line])
void $ forkIO $ readingLoop herr $ \line -> do
putStrLn $ "\ESC[31m" ++ nodeName node ++ "!> " ++ line ++ "\ESC[0m"
return Process
{ procHandle = handle
, procNode = node
, procStdin = hin
, procOutput = out
}
tryMatch :: Regex -> [String] -> Maybe (String, [String])
tryMatch re (x:xs) | Right (Just _) <- regexec re x = Just (x, xs)
| otherwise = fmap (x:) <$> tryMatch re xs
tryMatch _ [] = Nothing
expect :: Process -> String -> IO ()
expect p pat = case compile defaultCompOpt defaultExecOpt ("^" ++ pat ++ "$") of
Right re -> do
mbmatch <- atomically $ do
out <- readTVar (procOutput p)
case tryMatch re out of
Nothing -> retry
Just (m, out') -> do
writeTVar (procOutput p) out'
return $ Just m
case mbmatch of
Just line -> putStrLn $ "\ESC[32m" ++ nodeName (procNode p) ++ "+> " ++ line ++ "\ESC[0m"
Nothing -> putStrLn $ "\ESC[31m" ++ nodeName (procNode p) ++ "/> expect failed" ++ "\ESC[0m"
Left err -> putStrLn $ "failed to parse re: " ++ err
send :: Process -> String -> IO ()
send p str = do
hPutStrLn (procStdin p) str
hFlush (procStdin p)
main :: IO ()
main = do
[tool] <- getArgs
net <- initNetwork
node1 <- getNode net 1
node2 <- getNode net 2
p1 <- spawnOn node1 tool
p2 <- spawnOn node2 tool
send p1 "create-identity Device1"
send p2 "create-identity Device2"
send p1 "start-server"
send p2 "start-server"
expect p1 "peer [0-9]+ 192.168.0.11:29665"
expect p1 "peer [0-9]+ 192.168.0.12:29665"
expect p2 "peer [0-9]+ 192.168.0.12:29665"
expect p2 "peer [0-9]+ 192.168.0.11:29665"
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