github.com/equinix-metal/virtlet@v1.5.2-0.20191204181327-1659b8a48e9b/tests/network/dhcp_test.go

/*
Copyright 2016 Mirantis

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package network

import (
	"fmt"
	"net"
	"testing"
	"time"

	"github.com/containernetworking/cni/pkg/ns"
	cnitypes "github.com/containernetworking/cni/pkg/types"
	cnicurrent "github.com/containernetworking/cni/pkg/types/current"
	"github.com/vishvananda/netlink"

	"github.com/Mirantis/virtlet/pkg/nettools"
	"github.com/Mirantis/virtlet/pkg/network"
)

func TestDhcpServer(t *testing.T) {
	clientMac, _ := net.ParseMAC(clientMacAddrs[0])
	for _, tc := range []struct {
		name               string
		csn                network.ContainerSideNetwork
		expectedSubstrings []string
	}{
		{
			name: "with classless routes",
			csn: network.ContainerSideNetwork{
				Result: &cnicurrent.Result{
					Interfaces: []*cnicurrent.Interface{
						{
							Name: "eth0",
							Mac:  clientMacAddrs[0],
							// Sandbox is clientNS dependent
							// so it must be set in runtime
						},
					},
					IPs: []*cnicurrent.IPConfig{
						{
							Version:   "4",
							Interface: 0,
							Address: net.IPNet{
								IP:   net.IP{10, 1, 90, 5},
								Mask: net.IPMask{255, 255, 255, 0},
							},
							Gateway: net.IP{10, 1, 90, 1},
						},
					},
					Routes: []*cnitypes.Route{
						{
							Dst: net.IPNet{
								IP:   net.IP{0, 0, 0, 0},
								Mask: net.IPMask{0, 0, 0, 0},
							},
							GW: net.IP{10, 1, 90, 1},
						},
						{
							Dst: net.IPNet{
								IP:   net.IP{10, 10, 42, 0},
								Mask: net.IPMask{255, 255, 255, 0},
							},
							GW: net.IP{10, 1, 90, 90},
						},
					},
				},
				Interfaces: []*network.InterfaceDescription{
					{
						HardwareAddr: clientMac,
						MTU:          9000,
					},
				},
			},
			expectedSubstrings: []string{
				"new_broadcast_address='10.1.90.255'",
				"new_classless_static_routes='10.10.42.0/24 10.1.90.90 0.0.0.0/0 10.1.90.1'",
				"new_dhcp_lease_time='86400'",
				"new_dhcp_rebinding_time='64800'",
				"new_dhcp_renewal_time='43200'",
				"new_dhcp_server_identifier='169.254.254.2'",
				"new_domain_name_servers='8.8.8.8'",
				"new_ip_address='10.1.90.5'",
				"new_interface_mtu='9000'",
				"new_network_number='10.1.90.0'",
				"new_subnet_cidr='24'",
				"new_subnet_mask='255.255.255.0'",
				"veth0: offered 10.1.90.5 from 169.254.254.2",
			},
		},
		{
			name: "without classless routes",
			csn: network.ContainerSideNetwork{
				Result: &cnicurrent.Result{
					Interfaces: []*cnicurrent.Interface{
						{
							Name: "eth0",
							Mac:  clientMacAddrs[0],
							// Sandbox is clientNS dependent
							// so it must be set in runtime
						},
					},
					IPs: []*cnicurrent.IPConfig{
						{
							Version:   "4",
							Interface: 0,
							Address: net.IPNet{
								IP:   net.IP{10, 1, 90, 5},
								Mask: net.IPMask{255, 255, 255, 0},
							},
							Gateway: net.IP{10, 1, 90, 1},
						},
					},
					Routes: []*cnitypes.Route{
						{
							Dst: net.IPNet{
								IP:   net.IP{0, 0, 0, 0},
								Mask: net.IPMask{0, 0, 0, 0},
							},
							GW: net.IP{10, 1, 90, 1},
						},
					},
				},
				Interfaces: []*network.InterfaceDescription{
					{
						HardwareAddr: clientMac,
						MTU:          9000,
					},
				},
			},
			expectedSubstrings: []string{
				"new_broadcast_address='10.1.90.255'",
				"new_dhcp_lease_time='86400'",
				"new_dhcp_rebinding_time='64800'",
				"new_dhcp_renewal_time='43200'",
				"new_dhcp_server_identifier='169.254.254.2'",
				"new_domain_name_servers='8.8.8.8'",
				"new_ip_address='10.1.90.5'",
				"new_interface_mtu='9000'",
				"new_network_number='10.1.90.0'",
				"new_routers='10.1.90.1'",
				"new_subnet_cidr='24'",
				"new_subnet_mask='255.255.255.0'",
				"veth0: offered 10.1.90.5 from 169.254.254.2",
			},
		},
		// TODO: add dns test case here
	} {
		t.Run(tc.name, func(t *testing.T) {
			serverNS, err := ns.NewNS()
			if err != nil {
				t.Fatalf("Failed to create ns for dhcp server: %v", err)
			}
			defer serverNS.Close()
			clientNS, err := ns.NewNS()
			if err != nil {
				t.Fatalf("Failed to create ns for dhcp client: %v", err)
			}
			defer clientNS.Close()

			// Sandbox is clientNS dependent so it needs to be set there on all interfaces
			for _, iface := range tc.csn.Result.Interfaces {
				iface.Sandbox = clientNS.Path()
			}

			var clientVeth, serverVeth netlink.Link
			if err := serverNS.Do(func(ns.NetNS) error {
				serverVeth, clientVeth, err = nettools.CreateEscapeVethPair(clientNS, "veth0", 1500)
				if err != nil {
					return fmt.Errorf("failed to create escape veth pair: %v", err)
				}
				addr, err := netlink.ParseAddr("169.254.254.2/24")
				if err != nil {
					return fmt.Errorf("failed to parse dhcp interface address: %v", err)
				}
				if err = netlink.AddrAdd(serverVeth, addr); err != nil {
					return fmt.Errorf("failed to add addr for serverVeth: %v", err)
				}

				return nil
			}); err != nil {
				t.Fatal(err)
			}

			if err := clientNS.Do(func(ns.NetNS) error {
				mac, _ := net.ParseMAC(clientMacAddrs[0])
				if err = nettools.SetHardwareAddr(clientVeth, mac); err != nil {
					return fmt.Errorf("can't set MAC address on the client interface: %v", err)
				}

				return nil
			}); err != nil {
				t.Fatal(err)
			}

			g := NewNetTestGroup(t, 15*time.Second)
			defer g.Stop()
			g.Add(serverNS, NewDhcpServerTester(&tc.csn))

			g.Add(clientNS, NewDhcpClient("veth0", tc.expectedSubstrings))
			g.Wait()
		})
	}
}