# 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, withFirewall, ... }: let unit = if withFirewall then "firewall" else "nat"; in { name = "nat${if withFirewall then "WithFirewall" else "Standalone"}"; meta = with pkgs.stdenv.lib.maintainers; { maintainers = [ eelco chaoflow rob wkennington ]; }; nodes = { client = { config, pkgs, nodes, ... }: { virtualisation.vlans = [ 1 ]; networking.firewall.allowPing = true; networking.defaultGateway = (pkgs.lib.head nodes.router.config.networking.interfaces.eth2.ip4).address; }; router = { config, pkgs, ... }: { virtualisation.vlans = [ 2 1 ]; networking.firewall.enable = withFirewall; networking.firewall.allowPing = true; networking.nat.enable = true; networking.nat.internalIPs = [ "192.168.1.0/24" ]; networking.nat.externalInterface = "eth1"; }; server = { config, pkgs, ... }: { 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, ... }: '' startAll; # 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->succeed("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("iptables -t nat -D PREROUTING -j nixos-nat-pre"); $router->succeed("iptables -t nat -D POSTROUTING -j nixos-nat-post"); $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("systemctl restart ${unit}"); $client->succeed("curl --fail http://server/ >&2"); $client->succeed("ping -c 1 server >&2"); ''; })