# This test runs FRR and checks if OSPF routing works.
#
# Network topology:
#   [ client ]--net1--[ router1 ]--net2--[ router2 ]--net3--[ server ]
#
# All interfaces are in OSPF Area 0.

import ./make-test-python.nix (
  { pkgs, ... }:
  let

    ifAddr = node: iface: (pkgs.lib.head node.networking.interfaces.${iface}.ipv4.addresses).address;

    ospfConf1 = ''
      router ospf
        network 192.168.0.0/16 area 0
    '';

    ospfConf2 = ''
      interface eth2
        ip ospf hello-interval 1
        ip ospf dead-interval 5
      !
      router ospf
        network 192.168.0.0/16 area 0
    '';

  in
  {
    name = "frr";

    meta = with pkgs.lib.maintainers; {
      maintainers = [ ];
    };

    nodes = {

      client =
        { nodes, ... }:
        {
          virtualisation.vlans = [ 1 ];
          services.frr = {
            config = ''
              ip route 192.168.0.0/16 ${ifAddr nodes.router1 "eth1"}
            '';
          };
        };

      router1 =
        { ... }:
        {
          virtualisation.vlans = [
            1
            2
          ];
          boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
          networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
          services.frr = {
            ospfd.enable = true;
            config = ospfConf1;
          };

          specialisation.ospf.configuration = {
            services.frr.config = ospfConf2;
          };
        };

      router2 =
        { ... }:
        {
          virtualisation.vlans = [
            3
            2
          ];
          boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
          networking.firewall.extraCommands = "iptables -A nixos-fw -i eth2 -p ospfigp -j ACCEPT";
          services.frr = {
            ospfd.enable = true;
            config = ospfConf2;
          };
        };

      server =
        { nodes, ... }:
        {
          virtualisation.vlans = [ 3 ];
          services.frr = {
            config = ''
              ip route 192.168.0.0/16 ${ifAddr nodes.router2 "eth1"}
            '';
          };
        };
    };

    testScript =
      { nodes, ... }:
      ''
        start_all()

        # Wait for the networking to start on all machines
        for machine in client, router1, router2, server:
            machine.wait_for_unit("network.target")

        with subtest("Wait for FRR"):
            for gw in client, router1, router2, server:
                gw.wait_for_unit("frr")

        router1.succeed("${nodes.router1.system.build.toplevel}/specialisation/ospf/bin/switch-to-configuration test >&2")

        with subtest("Wait for OSPF to form adjacencies"):
            for gw in router1, router2:
                gw.wait_until_succeeds("vtysh -c 'show ip ospf neighbor' | grep Full")
                gw.wait_until_succeeds("vtysh -c 'show ip route' | grep '^O>'")

        with subtest("Test ICMP"):
            client.wait_until_succeeds("ping -4 -c 3 server >&2")
      '';
  }
)
