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# This test verifies DHCPv4 interaction between a client and a router.
# For successful DHCP allocations a dynamic update request is sent
# towards a nameserver to allocate a name in the lan.nixos.test zone.
# We then verify whether client and router can ping each other, and
# that the nameserver can resolve the clients fqdn to the correct IP
# address.
import ./make-test-python.nix ({ pkgs, lib, ...}: {
meta.maintainers = with lib.maintainers; [ hexa ];
name = "kea";
nodes = {
router = { config, pkgs, ... }: {
virtualisation.vlans = [ 1 ];
networking = {
useDHCP = false;
firewall.allowedUDPPorts = [ 67 ];
};
systemd.network = {
enable = true;
networks = {
"01-eth1" = {
name = "eth1";
networkConfig = {
Address = "10.0.0.1/29";
};
};
};
};
services.kea.dhcp4 = {
enable = true;
settings = {
valid-lifetime = 3600;
renew-timer = 900;
rebind-timer = 1800;
lease-database = {
type = "memfile";
persist = true;
name = "/var/lib/kea/dhcp4.leases";
};
control-socket = {
socket-type = "unix";
socket-name = "/run/kea/dhcp4.sock";
};
interfaces-config = {
dhcp-socket-type = "raw";
interfaces = [
"eth1"
];
};
subnet4 = [ {
subnet = "10.0.0.0/29";
pools = [ {
pool = "10.0.0.3 - 10.0.0.3";
} ];
} ];
# Enable communication between dhcp4 and a local dhcp-ddns
# instance.
# https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html#ddns-for-dhcpv4
dhcp-ddns = {
enable-updates = true;
};
ddns-send-updates = true;
ddns-qualifying-suffix = "lan.nixos.test.";
};
};
services.kea.dhcp-ddns = {
enable = true;
settings = {
forward-ddns = {
# Configure updates of a forward zone named `lan.nixos.test`
# hosted at the nameserver at 10.0.0.2
# https://kea.readthedocs.io/en/kea-2.2.0/arm/ddns.html#adding-forward-dns-servers
ddns-domains = [ {
name = "lan.nixos.test.";
# Use a TSIG key in production!
key-name = "";
dns-servers = [ {
ip-address = "10.0.0.2";
port = 53;
} ];
} ];
};
};
};
services.kea.ctrl-agent = {
enable = true;
settings = {
http-host = "127.0.0.1";
http-port = 8000;
control-sockets.dhcp4 = {
socket-type = "unix";
socket-name = "/run/kea/dhcp4.sock";
};
};
};
services.prometheus.exporters.kea = {
enable = true;
controlSocketPaths = [
"http://127.0.0.1:8000"
];
};
};
nameserver = { config, pkgs, ... }: {
virtualisation.vlans = [ 1 ];
networking = {
useDHCP = false;
firewall.allowedUDPPorts = [ 53 ];
};
systemd.network = {
enable = true;
networks = {
"01-eth1" = {
name = "eth1";
networkConfig = {
Address = "10.0.0.2/29";
};
};
};
};
services.resolved.enable = false;
# Set up an authoritative nameserver, serving the `lan.nixos.test`
# zone and configure an ACL that allows dynamic updates from
# the router's ip address.
# This ACL is likely insufficient for production usage. Please
# use TSIG keys.
services.knot = let
zone = pkgs.writeTextDir "lan.nixos.test.zone" ''
@ SOA ns.nixos.test nox.nixos.test 0 86400 7200 3600000 172800
@ NS nameserver
nameserver A 10.0.0.3
router A 10.0.0.1
'';
zonesDir = pkgs.buildEnv {
name = "knot-zones";
paths = [ zone ];
};
in {
enable = true;
extraArgs = [
"-v"
];
settings = {
server.listen = [
"0.0.0.0@53"
];
log.syslog.any = "info";
acl.dhcp_ddns = {
address = "10.0.0.1";
action = "update";
};
template.default = {
storage = zonesDir;
zonefile-sync = "-1";
zonefile-load = "difference-no-serial";
journal-content = "all";
};
zone."lan.nixos.test" = {
file = "lan.nixos.test.zone";
acl = [
"dhcp_ddns"
];
};
};
};
};
client = { config, pkgs, ... }: {
virtualisation.vlans = [ 1 ];
systemd.services.systemd-networkd.environment.SYSTEMD_LOG_LEVEL = "debug";
networking = {
useNetworkd = true;
useDHCP = false;
firewall.enable = false;
interfaces.eth1.useDHCP = true;
};
};
};
testScript = { ... }: ''
start_all()
router.wait_for_unit("kea-dhcp4-server.service")
client.wait_for_unit("systemd-networkd-wait-online.service")
client.wait_until_succeeds("ping -c 5 10.0.0.1")
router.wait_until_succeeds("ping -c 5 10.0.0.3")
nameserver.wait_until_succeeds("kdig +short client.lan.nixos.test @10.0.0.2 | grep -q 10.0.0.3")
router.log(router.execute("curl 127.0.0.1:9547")[1])
router.succeed("curl --no-buffer 127.0.0.1:9547 | grep -qE '^kea_dhcp4_addresses_assigned_total.*1.0$'")
'';
})
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