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module System.Global6 where
import Control.Monad
import Data.IP
import Data.List
import Data.Maybe
import Network.Socket
import System.Process
import Text.Read
parseIpAddr :: String -> Maybe IPv6
parseIpAddr s = do
let ws = words s
(addr,bs) = splitAt 1 $ drop 1 $ dropWhile (/= "inet6") ws
guard ("global" `elem` bs)
addr <- listToMaybe addr
guard (not $ isPrefixOf "fd" addr)
guard (not $ isPrefixOf "fc" addr)
let (addr',slash) = break (=='/') addr
ip6 <- readMaybe addr'
return $ (ip6 :: IPv6)
global6 :: IO (Maybe IPv6)
global6 = do
addrs <- lines <$> readProcess "ip" ["-o","-6","addr"] ""
return $ foldr1 mplus $ map parseIpAddr addrs
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