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-rw-r--r--src/Propellor/CmdLine.hs18
1 files changed, 12 insertions, 6 deletions
diff --git a/src/Propellor/CmdLine.hs b/src/Propellor/CmdLine.hs
index 219fe026..d29ffbb7 100644
--- a/src/Propellor/CmdLine.hs
+++ b/src/Propellor/CmdLine.hs
@@ -7,7 +7,7 @@ import System.Environment (getArgs)
import Data.List
import System.Exit
import System.PosixCompat
-import qualified Network.BSD
+import Network.Socket
import Propellor
import Propellor.Gpg
@@ -165,9 +165,15 @@ updateFirst' cmdline next = ifM fetchOrigin
, next
)
+-- Gets the fully qualified domain name, given a string that might be
+-- a short name to look up in the DNS.
hostname :: String -> IO HostName
-hostname s
- | "." `isInfixOf` s = pure s
- | otherwise = do
- h <- Network.BSD.getHostByName s
- return (Network.BSD.hostName h)
+hostname s = go =<< catchDefaultIO [] dnslookup
+ where
+ dnslookup = getAddrInfo (Just canonname) (Just s) Nothing
+ canonname = defaultHints { addrFlags = [AI_CANONNAME] }
+ go (AddrInfo { addrCanonName = Just v } : _) = pure v
+ go _
+ | "." `isInfixOf` s = pure s -- assume it's a fqdn
+ | otherwise =
+ error $ "cannot find host " ++ s ++ " in the DNS"