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-rw-r--r--src/Propellor/Property/Network.hs105
1 files changed, 85 insertions, 20 deletions
diff --git a/src/Propellor/Property/Network.hs b/src/Propellor/Property/Network.hs
index 6009778a..4d7ccffb 100644
--- a/src/Propellor/Property/Network.hs
+++ b/src/Propellor/Property/Network.hs
@@ -3,28 +3,93 @@ module Propellor.Property.Network where
import Propellor
import Propellor.Property.File
-interfaces :: FilePath
-interfaces = "/etc/network/interfaces"
+type Interface = String
+
+ifUp :: Interface -> Property NoInfo
+ifUp iface = cmdProperty "ifup" [iface]
+
+-- | Resets /etc/network/interfaces to a clean and empty state,
+-- containing just the standard loopback interface, and with
+-- interfacesD enabled.
+--
+-- This can be used as a starting point to defining other interfaces.
+--
+-- No interfaces are brought up or down by this property.
+cleanInterfacesFile :: Property NoInfo
+cleanInterfacesFile = hasContent interfacesFile
+ [ "# Deployed by propellor, do not edit."
+ , ""
+ , "source-directory interfaces.d"
+ , ""
+ , "# The loopback network interface"
+ , "auto lo"
+ , "iface lo inet loopback"
+ ]
+ `describe` ("clean " ++ interfacesFile)
+
+-- | Writes a static interface file for the specified interface.
+--
+-- The interface has to be up already. It could have been brought up by
+-- DHCP, or by other means. The current ipv4 addresses
+-- and routing configuration of the interface are written into the file.
+--
+-- If the interface file already exists, this property does nothing,
+-- no matter its content.
+--
+-- (ipv6 addresses are not included because it's assumed they come up
+-- automatically in most situations.)
+static :: Interface -> Property NoInfo
+static iface = check (not <$> doesFileExist f) setup
+ `describe` desc
+ `requires` interfacesDEnabled
+ where
+ f = interfaceDFile iface
+ desc = "static " ++ iface
+ setup = property desc $ do
+ ls <- liftIO $ lines <$> readProcess "ip"
+ ["-o", "addr", "show", iface, "scope", "global"]
+ stanzas <- liftIO $ concat <$> mapM mkstanza ls
+ ensureProperty $ hasContent f $ ("auto " ++ iface) : stanzas
+ mkstanza ipline = case words ipline of
+ -- Note that the IP address is written CIDR style, so
+ -- the netmask does not need to be specified separately.
+ (_:iface':"inet":addr:_) | iface' == iface -> do
+ gw <- getgateway
+ return $ catMaybes
+ [ Just $ "iface " ++ iface ++ " inet static"
+ , Just $ "\taddress " ++ addr
+ , ("\tgateway " ++) <$> gw
+ ]
+ _ -> return []
+ getgateway = do
+ rs <- lines <$> readProcess "ip"
+ ["route", "show", "scope", "global", "dev", iface]
+ return $ case words <$> headMaybe rs of
+ Just ("default":"via":gw:_) -> Just gw
+ _ -> Nothing
-- | 6to4 ipv6 connection, should work anywhere
-ipv6to4 :: Property
-ipv6to4 = fileProperty "ipv6to4" go interfaces
+ipv6to4 :: Property NoInfo
+ipv6to4 = hasContent (interfaceDFile "sit0")
+ [ "# Deployed by propellor, do not edit."
+ , "iface sit0 inet6 static"
+ , "\taddress 2002:5044:5531::1"
+ , "\tnetmask 64"
+ , "\tgateway ::192.88.99.1"
+ , "auto sit0"
+ ]
+ `describe` "ipv6to4"
+ `requires` interfacesDEnabled
`onChange` ifUp "sit0"
- where
- go ls
- | all (`elem` ls) stanza = ls
- | otherwise = ls ++ stanza
- stanza =
- [ "# Automatically added by propeller"
- , "iface sit0 inet6 static"
- , "\taddress 2002:5044:5531::1"
- , "\tnetmask 64"
- , "\tgateway ::192.88.99.1"
- , "auto sit0"
- , "# End automatically added by propeller"
- ]
-type Interface = String
+interfacesFile :: FilePath
+interfacesFile = "/etc/network/interfaces"
-ifUp :: Interface -> Property
-ifUp iface = cmdProperty "ifup" [iface]
+-- | A file in the interfaces.d directory.
+interfaceDFile :: Interface -> FilePath
+interfaceDFile iface = "/etc/network/interfaces.d" </> iface
+
+-- | Ensures that files in the the interfaces.d directory are used.
+interfacesDEnabled :: Property NoInfo
+interfacesDEnabled = containsLine interfacesFile "source-directory interfaces.d"
+ `describe` "interfaces.d directory enabled"