infix/test/case/dhcp/client_default_gw/test.py

#!/usr/bin/env python3
"""DHCP router

Verify that the DHCP client receives default gateway (DHCP option 3,
router) and that route exists in operational datastore.  The DHCP
server runs at 192.168.0.1 but should hand out option 3 to clients
with address 192.168.0.254.
"""

import infamy, infamy.dhcp
import infamy.route as route
from infamy.util import until

with infamy.Test() as test:
    ROUTER = '192.168.0.254'

    with test.step("Initialize"):
        env = infamy.Env()
        client = env.attach("client", "mgmt")
        _, host = env.ltop.xlate("host", "data")

    with infamy.IsolatedMacVlan(host) as netns:
        with test.step("Set up DHCP server as 192.168.0.1, option 3: 192.168.0.254"):
            netns.addip("192.168.0.1")

        with infamy.dhcp.Server(netns, router=ROUTER):
            _, port = env.ltop.xlate("client", "data")
            config = {
                "interfaces": {
                    "interface": [{
                        "name": f"{port}",
                        "ipv4": {
                            "infix-dhcp-client:dhcp": {
                                "option": [
                                    {"id": "router"}
                                ]
                            }
                        }
                    }]
                }
            }
            client.put_config_dicts({"ietf-interfaces": config})

            with test.step("Verify DHCP client has default route via 192.168.0.254"):
                until(lambda: route.ipv4_route_exist(client, "0.0.0.0/0", ROUTER), attempts=30)

    test.succeed()