# 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.nix ({ pkgs, lib, withFirewall, withConntrackHelpers ? false, ... }: let unit = if withFirewall then "firewall" else "nat"; routerBase = lib.mkMerge [ { virtualisation.vlans = [ 2 1 ]; networking.firewall.enable = withFirewall; 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" + (if withFirewall then "WithFirewall" else "Standalone") + (lib.optionalString withConntrackHelpers "withConntrackHelpers"); meta = with pkgs.stdenv.lib.maintainers; { maintainers = [ eelco chaoflow rob ]; }; nodes = { client = { pkgs, nodes, ... }: lib.mkMerge [ { virtualisation.vlans = [ 1 ]; networking.defaultGateway = (pkgs.lib.head nodes.router.config.networking.interfaces.eth2.ipv4.addresses).address; } (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->waitForUnit("network.target"); $server->waitForUnit("httpd"); $router->waitForUnit("network.target"); $router->succeed("curl --fail http://server/ >&2"); # The client should be also able to connect via the NAT router. $router->waitForUnit("${unit}"); $client->waitForUnit("network.target"); $client->succeed("curl --fail http://server/ >&2"); $client->succeed("ping -c 1 server >&2"); # Test whether passive FTP works. $server->waitForUnit("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) '' $router->succeed("systemctl start nat.service"); ''} $client->succeed("curl --fail http://server/ >&2"); $client->succeed("ping -c 1 server >&2"); ''; })