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{-# LANGUAGE OverloadedStrings #-}
module Network.WireGuard.Internal.RpcParsers(
requestParser,
deviceParser,
peerParser
) where
import Control.Applicative ((*>), (<|>))
import Control.Monad (join)
import Crypto.Noise.DH (dhBytesToPair, dhBytesToPub)
import Data.Attoparsec.ByteString.Char8 (Parser, string,
takeTill, option,
endOfLine, peekChar')
import Data.Attoparsec.Text (isEndOfLine)
import Data.Attoparsec.Combinator ((<?>), many')
import qualified Data.ByteArray as BA (convert, )
import Data.ByteString (ByteString)
import Data.ByteString.Conversion (fromByteString)
import qualified Data.ByteString.Char8 as BC (pack, unpack)
import Data.Maybe (fromMaybe, listToMaybe,
fromJust)
import Data.IP (IPRange, toHostAddress6)
import Data.Hex (unhex)
import Network.Socket (SockAddr, tupleToHostAddress,
SockAddr(..))
import Network.WireGuard.Internal.Data.RpcTypes (OpType(..),
RpcRequest(..),
RpcDevicePayload(..),
RpcPeerPayload(..),
RpcSetPayload(..),
RpcDeviceField(..),
RpcPeerField(..))
-- | Attoparsec parser used to parse a RPC request, both Set or Get.
requestParser :: Parser RpcRequest
requestParser = do
op <- requestTypeParser
let p = case op of
Set -> undefined
Get -> Nothing
_ <- string $ BC.pack "\n\n"
return $ RpcRequest op p
requestTypeParser :: Parser OpType
requestTypeParser = "get=1" *> return Get
<|> "set=1" *> return Set
setPayloadParser :: Parser RpcSetPayload
setPayloadParser = undefined
deviceParser :: Parser RpcDevicePayload
deviceParser = do
fields <- deviceFieldsParser
let pk = join $ listToMaybe [ pkF | RpcPk pkF <- fields]
let p = head [ pF | RpcPort pF <- fields]
let fw = join $ listToMaybe [ fwF | RpcFwMark fwF <- fields]
let rmDev = not $ null [True | RpcReplacePeers <- fields]
return $ RpcDevicePayload pk p fw rmDev
deviceFieldsParser :: Parser [RpcDeviceField]
deviceFieldsParser = many' (deviceFieldParser <* endOfLine)
deviceFieldParser :: Parser RpcDeviceField
deviceFieldParser = do
key <- takeTill (=='=')
_ <- "="
case key of
"private_key" -> do
pkHex <- option Nothing (unhex <$> takeTill isEndOfLine) <?> "Primary Key parser"
return . RpcPk . join $ (dhBytesToPair . BA.convert) <$> pkHex
"listen_port" -> do
p <- (fromMaybe 0 . fromByteString) <$> takeTill isEndOfLine <?> "Listen Port parser"
return $ RpcPort p
"fwmark" -> do
fwmark <- option Nothing (fromByteString <$> takeTill isEndOfLine) <?> "fwmark parser"
return $ RpcFwMark fwmark
"replace_peers" -> do
_ <- "true"
return RpcReplacePeers
_ -> fail "Not a device key"
peerParser :: Parser RpcPeerPayload
peerParser = do
pubK <- parsePubKey
fields <- peerFieldsParser
let rm = not $ null [rmF | RpcRmFlag rmF <- fields]
let psh = listToMaybe [pshF | RpcPsh pshF <- fields]
let endPL = [endPF | RpcEndp endPF <- fields]
endP <- if null endPL
then fail "Cannot parse Peer endpoint"
else return $ head endPL
let ka = fromMaybe 0 $ listToMaybe [kaF | RpcKA kaF <- fields]
let rmIps = not $ null [rmIpsF | RpcDelIps rmIpsF <- fields]
let allIpR = [ipRF | RpcAllIp ipRF <- fields]
return $ RpcPeerPayload pubK rm psh endP ka rmIps allIpR
where
parsePubKey = do
_ <- "public_key=" <?> "Peer delimiter"
pubHex <- unhex <$> takeTill isEndOfLine :: Parser (Maybe ByteString)
_ <- "\n"
let pubMaybe = join $ (dhBytesToPub . BA.convert) <$> pubHex
maybe (fail "Cannot parse peer's public key") return pubMaybe
peerFieldsParser :: Parser [RpcPeerField]
peerFieldsParser = many' (peerFieldParser <* endOfLine)
peerFieldParser :: Parser RpcPeerField
peerFieldParser = do
key <- takeTill (=='=')
_ <- "="
case key of
"remove" -> (do
_ <- "true"
return $ RpcRmFlag True) <?> "Remove peer parser"
"preshared_key" -> (do
pshHex <- unhex <$> takeTill isEndOfLine
return . RpcPsh . BA.convert . fromJust $ pshHex) <?> "Psh key peer parser"
"endpoint" -> RpcEndp <$> parseIpAddress <?> "Endpoint peer parser"
"persistent_keepalive_interval" -> (RpcKA . read . BC.unpack) <$> takeTill isEndOfLine <?> "Persistant keepalive parser"
"replace_allowed_ips" -> (do
_ <- "true"
return $ RpcDelIps True) <?> "Replace allowed Ips parser"
"allowed_ip" -> RpcAllIp <$> parseIpRange <?> "Allowed ips parser"
_ -> fail "Not a peer key"
parseIpAddress :: Parser SockAddr
parseIpAddress = do
f <- peekChar'
if f == '['
then parseIpv6
else parseIpv4
where
parseIpv6 = do
_ <- "["
host1 <- (fromJust . fromByteString) <$> takeTill (=='%')
_ <- "%"
scope_id <- (fromJust . fromByteString) <$> takeTill (==']')
_ <- "]:"
port <- (read . fromJust . fromByteString) <$> takeTill isEndOfLine
let host = toHostAddress6 $ read host1
return $ SockAddrInet6 port 0 host scope_id
parseIpv4 = do
ip1 <- (fromJust . fromByteString) <$> takeTill (=='.')
_ <- "."
ip2 <- (fromJust . fromByteString) <$> takeTill (=='.')
_ <- "."
ip3 <- (fromJust . fromByteString) <$> takeTill (=='.')
_ <- "."
ip4 <- (fromJust . fromByteString) <$> takeTill (==':')
_ <- ":"
p <- (fromInteger . fromJust . fromByteString) <$> takeTill isEndOfLine
return . SockAddrInet p $ tupleToHostAddress (ip1,ip2,ip3,ip4)
parseIpRange :: Parser IPRange
parseIpRange = do
f <- peekChar'
if f == '['
then parseIpv6Range
else parseIpv4Range
where
parseIpv4Range = do
line <- takeTill isEndOfLine
return . read . fromJust $ fromByteString line
parseIpv6Range = do
_ <- "["
rng <- takeTill (==']')
_ <- "]"
return . read . fromJust $ fromByteString rng
|
