# This is a simple distributed test involving a topology with two # separate virtual networks - the "inside" and the "outside" - with a # client on the inside network, a server on the outside network, and a # router connected to both that performs Network Address Translation # for the client. import ./make-test-python.nix ({ pkgs, lib, withFirewall, withConntrackHelpers ? false, nftables ? false, ... }: let unit = if nftables then "nftables" else (if withFirewall then "firewall" else "nat"); routerBase = lib.mkMerge [ { virtualisation.vlans = [ 2 1 ]; networking.firewall.enable = withFirewall; networking.firewall.filterForward = nftables; networking.nftables.enable = nftables; networking.nat.internalIPs = [ "192.168.1.0/24" ]; networking.nat.externalInterface = "eth1"; } (lib.optionalAttrs withConntrackHelpers { networking.firewall.connectionTrackingModules = [ "ftp" ]; networking.firewall.autoLoadConntrackHelpers = true; }) ]; in { name = "nat" + (lib.optionalString nftables "Nftables") + (if withFirewall then "WithFirewall" else "Standalone") + (lib.optionalString withConntrackHelpers "withConntrackHelpers"); meta = with pkgs.lib.maintainers; { maintainers = [ eelco rob ]; }; nodes = { client = { pkgs, nodes, ... }: lib.mkMerge [ { virtualisation.vlans = [ 1 ]; networking.defaultGateway = (pkgs.lib.head nodes.router.config.networking.interfaces.eth2.ipv4.addresses).address; networking.nftables.enable = nftables; } (lib.optionalAttrs withConntrackHelpers { networking.firewall.connectionTrackingModules = [ "ftp" ]; networking.firewall.autoLoadConntrackHelpers = true; }) ]; router = { ... }: lib.mkMerge [ routerBase { networking.nat.enable = true; } ]; routerDummyNoNat = { ... }: lib.mkMerge [ routerBase { networking.nat.enable = false; } ]; server = { ... }: { virtualisation.vlans = [ 2 ]; networking.firewall.enable = false; services.httpd.enable = true; services.httpd.adminAddr = "foo@example.org"; services.vsftpd.enable = true; services.vsftpd.anonymousUser = true; }; }; testScript = { nodes, ... }: let routerDummyNoNatClosure = nodes.routerDummyNoNat.config.system.build.toplevel; routerClosure = nodes.router.config.system.build.toplevel; in '' client.start() router.start() server.start() # The router should have access to the server. server.wait_for_unit("network.target") server.wait_for_unit("httpd") router.wait_for_unit("network.target") router.succeed("curl --fail http://server/ >&2") # The client should be also able to connect via the NAT router. router.wait_for_unit("${unit}") client.wait_for_unit("network.target") client.succeed("curl --fail http://server/ >&2") client.succeed("ping -c 1 server >&2") # Test whether passive FTP works. server.wait_for_unit("vsftpd") server.succeed("echo Hello World > /home/ftp/foo.txt") client.succeed("curl -v ftp://server/foo.txt >&2") # Test whether active FTP works. client.${if withConntrackHelpers then "succeed" else "fail"}("curl -v -P - ftp://server/foo.txt >&2") # Test ICMP. client.succeed("ping -c 1 router >&2") router.succeed("ping -c 1 client >&2") # If we turn off NAT, the client shouldn't be able to reach the server. router.succeed( "${routerDummyNoNatClosure}/bin/switch-to-configuration test 2>&1" ) client.fail("curl --fail --connect-timeout 5 http://server/ >&2") client.fail("ping -c 1 server >&2") # And make sure that reloading the NAT job works. router.succeed( "${routerClosure}/bin/switch-to-configuration test 2>&1" ) # FIXME: this should not be necessary, but nat.service is not started because # network.target is not triggered # (https://github.com/NixOS/nixpkgs/issues/16230#issuecomment-226408359) ${lib.optionalString (!withFirewall && !nftables) '' router.succeed("systemctl start nat.service") ''} client.succeed("curl --fail http://server/ >&2") client.succeed("ping -c 1 server >&2") ''; })