mirror of
https://github.com/netbirdio/netbird.git
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290 lines
9.0 KiB
Go
290 lines
9.0 KiB
Go
package routemanager
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import (
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"context"
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"encoding/json"
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"fmt"
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"net"
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"os/exec"
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"strings"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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nbnet "github.com/netbirdio/netbird/util/net"
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)
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var expectedExtInt = "Ethernet1"
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type RouteInfo struct {
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NextHop string `json:"nexthop"`
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InterfaceAlias string `json:"interfacealias"`
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RouteMetric int `json:"routemetric"`
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}
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type FindNetRouteOutput struct {
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IPAddress string `json:"IPAddress"`
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InterfaceIndex int `json:"InterfaceIndex"`
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InterfaceAlias string `json:"InterfaceAlias"`
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AddressFamily int `json:"AddressFamily"`
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NextHop string `json:"NextHop"`
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DestinationPrefix string `json:"DestinationPrefix"`
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}
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type testCase struct {
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name string
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destination string
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expectedSourceIP string
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expectedDestPrefix string
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expectedNextHop string
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expectedInterface string
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dialer dialer
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}
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var expectedVPNint = "wgtest0"
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var testCases = []testCase{
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{
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name: "To external host without custom dialer via vpn",
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destination: "192.0.2.1:53",
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expectedSourceIP: "100.64.0.1",
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expectedDestPrefix: "128.0.0.0/1",
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expectedNextHop: "0.0.0.0",
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expectedInterface: "wgtest0",
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dialer: &net.Dialer{},
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},
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{
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name: "To external host with custom dialer via physical interface",
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destination: "192.0.2.1:53",
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expectedDestPrefix: "192.0.2.1/32",
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expectedInterface: expectedExtInt,
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dialer: nbnet.NewDialer(),
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},
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{
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name: "To duplicate internal route with custom dialer via physical interface",
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destination: "10.0.0.2:53",
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expectedDestPrefix: "10.0.0.2/32",
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expectedInterface: expectedExtInt,
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dialer: nbnet.NewDialer(),
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},
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{
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name: "To duplicate internal route without custom dialer via physical interface", // local route takes precedence
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destination: "10.0.0.2:53",
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expectedSourceIP: "10.0.0.1",
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expectedDestPrefix: "10.0.0.0/8",
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expectedNextHop: "0.0.0.0",
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expectedInterface: "Loopback Pseudo-Interface 1",
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dialer: &net.Dialer{},
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},
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{
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name: "To unique vpn route with custom dialer via physical interface",
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destination: "172.16.0.2:53",
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expectedDestPrefix: "172.16.0.2/32",
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expectedInterface: expectedExtInt,
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dialer: nbnet.NewDialer(),
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},
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{
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name: "To unique vpn route without custom dialer via vpn",
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destination: "172.16.0.2:53",
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expectedSourceIP: "100.64.0.1",
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expectedDestPrefix: "172.16.0.0/12",
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expectedNextHop: "0.0.0.0",
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expectedInterface: "wgtest0",
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dialer: &net.Dialer{},
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},
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{
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name: "To more specific route without custom dialer via vpn interface",
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destination: "10.10.0.2:53",
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expectedSourceIP: "100.64.0.1",
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expectedDestPrefix: "10.10.0.0/24",
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expectedNextHop: "0.0.0.0",
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expectedInterface: "wgtest0",
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dialer: &net.Dialer{},
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},
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{
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name: "To more specific route (local) without custom dialer via physical interface",
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destination: "127.0.10.2:53",
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expectedSourceIP: "10.0.0.1",
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expectedDestPrefix: "127.0.0.0/8",
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expectedNextHop: "0.0.0.0",
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expectedInterface: "Loopback Pseudo-Interface 1",
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dialer: &net.Dialer{},
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},
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}
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func TestRouting(t *testing.T) {
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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setupTestEnv(t)
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route, err := fetchOriginalGateway()
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require.NoError(t, err, "Failed to fetch original gateway")
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ip, err := fetchInterfaceIP(route.InterfaceAlias)
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require.NoError(t, err, "Failed to fetch interface IP")
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output := testRoute(t, tc.destination, tc.dialer)
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if tc.expectedInterface == expectedExtInt {
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verifyOutput(t, output, ip, tc.expectedDestPrefix, route.NextHop, route.InterfaceAlias)
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} else {
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verifyOutput(t, output, tc.expectedSourceIP, tc.expectedDestPrefix, tc.expectedNextHop, tc.expectedInterface)
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}
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})
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}
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}
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// fetchInterfaceIP fetches the IPv4 address of the specified interface.
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func fetchInterfaceIP(interfaceAlias string) (string, error) {
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script := fmt.Sprintf(`Get-NetIPAddress -InterfaceAlias "%s" | Where-Object AddressFamily -eq 2 | Select-Object -ExpandProperty IPAddress`, interfaceAlias)
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out, err := exec.Command("powershell", "-Command", script).Output()
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if err != nil {
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return "", fmt.Errorf("failed to execute Get-NetIPAddress: %w", err)
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}
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ip := strings.TrimSpace(string(out))
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return ip, nil
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}
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func testRoute(t *testing.T, destination string, dialer dialer) *FindNetRouteOutput {
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t.Helper()
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ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
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defer cancel()
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conn, err := dialer.DialContext(ctx, "udp", destination)
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require.NoError(t, err, "Failed to dial destination")
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defer func() {
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err := conn.Close()
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assert.NoError(t, err, "Failed to close connection")
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}()
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host, _, err := net.SplitHostPort(destination)
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require.NoError(t, err)
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script := fmt.Sprintf(`Find-NetRoute -RemoteIPAddress "%s" | Select-Object -Property IPAddress, InterfaceIndex, InterfaceAlias, AddressFamily, NextHop, DestinationPrefix | ConvertTo-Json`, host)
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out, err := exec.Command("powershell", "-Command", script).Output()
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require.NoError(t, err, "Failed to execute Find-NetRoute")
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var outputs []FindNetRouteOutput
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err = json.Unmarshal(out, &outputs)
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require.NoError(t, err, "Failed to parse JSON outputs from Find-NetRoute")
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require.Greater(t, len(outputs), 0, "No route found for destination")
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combinedOutput := combineOutputs(outputs)
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return combinedOutput
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}
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func createAndSetupDummyInterface(t *testing.T, interfaceName, ipAddressCIDR string) string {
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t.Helper()
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ip, ipNet, err := net.ParseCIDR(ipAddressCIDR)
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require.NoError(t, err)
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subnetMaskSize, _ := ipNet.Mask.Size()
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script := fmt.Sprintf(`New-NetIPAddress -InterfaceAlias "%s" -IPAddress "%s" -PrefixLength %d -PolicyStore ActiveStore -Confirm:$False`, interfaceName, ip.String(), subnetMaskSize)
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_, err = exec.Command("powershell", "-Command", script).CombinedOutput()
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require.NoError(t, err, "Failed to assign IP address to loopback adapter")
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// Wait for the IP address to be applied
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ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
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defer cancel()
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err = waitForIPAddress(ctx, interfaceName, ip.String())
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require.NoError(t, err, "IP address not applied within timeout")
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t.Cleanup(func() {
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script = fmt.Sprintf(`Remove-NetIPAddress -InterfaceAlias "%s" -IPAddress "%s" -Confirm:$False`, interfaceName, ip.String())
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_, err = exec.Command("powershell", "-Command", script).CombinedOutput()
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require.NoError(t, err, "Failed to remove IP address from loopback adapter")
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})
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return interfaceName
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}
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func fetchOriginalGateway() (*RouteInfo, error) {
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cmd := exec.Command("powershell", "-Command", "Get-NetRoute -DestinationPrefix 0.0.0.0/0 | Select-Object NextHop, RouteMetric, InterfaceAlias | ConvertTo-Json")
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output, err := cmd.CombinedOutput()
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if err != nil {
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return nil, fmt.Errorf("failed to execute Get-NetRoute: %w", err)
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}
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var routeInfo RouteInfo
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err = json.Unmarshal(output, &routeInfo)
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if err != nil {
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return nil, fmt.Errorf("failed to parse JSON output: %w", err)
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}
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return &routeInfo, nil
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}
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func verifyOutput(t *testing.T, output *FindNetRouteOutput, sourceIP, destPrefix, nextHop, intf string) {
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t.Helper()
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assert.Equal(t, sourceIP, output.IPAddress, "Source IP mismatch")
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assert.Equal(t, destPrefix, output.DestinationPrefix, "Destination prefix mismatch")
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assert.Equal(t, nextHop, output.NextHop, "Next hop mismatch")
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assert.Equal(t, intf, output.InterfaceAlias, "Interface mismatch")
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}
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func waitForIPAddress(ctx context.Context, interfaceAlias, expectedIPAddress string) error {
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ticker := time.NewTicker(1 * time.Second)
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defer ticker.Stop()
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-ticker.C:
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out, err := exec.Command("powershell", "-Command", fmt.Sprintf(`Get-NetIPAddress -InterfaceAlias "%s" | Select-Object -ExpandProperty IPAddress`, interfaceAlias)).CombinedOutput()
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if err != nil {
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return err
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}
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ipAddresses := strings.Split(strings.TrimSpace(string(out)), "\n")
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for _, ip := range ipAddresses {
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if strings.TrimSpace(ip) == expectedIPAddress {
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return nil
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}
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}
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}
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}
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}
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func combineOutputs(outputs []FindNetRouteOutput) *FindNetRouteOutput {
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var combined FindNetRouteOutput
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for _, output := range outputs {
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if output.IPAddress != "" {
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combined.IPAddress = output.IPAddress
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}
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if output.InterfaceIndex != 0 {
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combined.InterfaceIndex = output.InterfaceIndex
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}
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if output.InterfaceAlias != "" {
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combined.InterfaceAlias = output.InterfaceAlias
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}
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if output.AddressFamily != 0 {
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combined.AddressFamily = output.AddressFamily
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}
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if output.NextHop != "" {
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combined.NextHop = output.NextHop
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}
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if output.DestinationPrefix != "" {
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combined.DestinationPrefix = output.DestinationPrefix
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}
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}
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return &combined
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}
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func setupDummyInterfacesAndRoutes(t *testing.T) {
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t.Helper()
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createAndSetupDummyInterface(t, "Loopback Pseudo-Interface 1", "10.0.0.1/8")
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}
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