Enhance route command with ptables and multiple routes

This commit rewrites the `routes list` command to use ptables to present
a slightly nicer list, including a new field if the route is enabled or
not (which is quite useful).

In addition, it reworks the enable command to support enabling multiple
routes (not only one route as per removed TODO). This allows users to
actually take advantage of exit-nodes and subnet relays.

cmd/headscale/cli/routes.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"strings"
 
+	"github.com/pterm/pterm"
 	"github.com/spf13/cobra"
 )
 
@@ -44,19 +45,25 @@ var listRoutesCmd = &cobra.Command{
 		if err != nil {
 			log.Fatalf("Error initializing: %s", err)
 		}
-		routes, err := h.GetNodeRoutes(n, args[0])
 
-		if strings.HasPrefix(o, "json") {
-			JsonOutput(routes, err, o)
+		availableRoutes, err := h.GetAdvertisedNodeRoutes(n, args[0])
+		if err != nil {
+			fmt.Println(err)
 			return
 		}
 
-		if err != nil {
-			fmt.Println(err)
+		if strings.HasPrefix(o, "json") {
+			// TODO: Add enable/disabled information to this interface
+			JsonOutput(availableRoutes, err, o)
 			return
 		}
 
-		fmt.Println(routes)
+		d := h.RoutesToPtables(n, args[0], *availableRoutes)
+
+		err = pterm.DefaultTable.WithHasHeader().WithData(d).Render()
+		if err != nil {
+			log.Fatal(err)
+		}
 	},
 }
 
@@ -80,16 +87,17 @@ var enableRouteCmd = &cobra.Command{
 		if err != nil {
 			log.Fatalf("Error initializing: %s", err)
 		}
-		route, err := h.EnableNodeRoute(n, args[0], args[1])
+
+		err = h.EnableNodeRoute(n, args[0], args[1])
 		if strings.HasPrefix(o, "json") {
-			JsonOutput(route, err, o)
+			JsonOutput(args[1], err, o)
 			return
 		}
 
 		if err != nil {
 			fmt.Println(err)
 			return
 		}
-		fmt.Printf("Enabled route %s\n", route)
+		fmt.Printf("Enabled route %s\n", args[1])
 	},
 }

routes.go

@@ -2,55 +2,140 @@ package headscale
 
 import (
 	"encoding/json"
-	"errors"
+	"fmt"
+	"strconv"
 
+	"github.com/pterm/pterm"
 	"gorm.io/datatypes"
 	"inet.af/netaddr"
 )
 
-// GetNodeRoutes returns the subnet routes advertised by a node (identified by
+// GetAdvertisedNodeRoutes returns the subnet routes advertised by a node (identified by
 // namespace and node name)
-func (h *Headscale) GetNodeRoutes(namespace string, nodeName string) (*[]netaddr.IPPrefix, error) {
+func (h *Headscale) GetAdvertisedNodeRoutes(namespace string, nodeName string) (*[]netaddr.IPPrefix, error) {
 	m, err := h.GetMachine(namespace, nodeName)
 	if err != nil {
 		return nil, err
 	}
 
-	hi, err := m.GetHostInfo()
+	hostInfo, err := m.GetHostInfo()
 	if err != nil {
 		return nil, err
 	}
-	return &hi.RoutableIPs, nil
+	return &hostInfo.RoutableIPs, nil
 }
 
-// EnableNodeRoute enables a subnet route advertised by a node (identified by
+// GetEnabledNodeRoutes returns the subnet routes enabled by a node (identified by
 // namespace and node name)
-func (h *Headscale) EnableNodeRoute(namespace string, nodeName string, routeStr string) (*netaddr.IPPrefix, error) {
+func (h *Headscale) GetEnabledNodeRoutes(namespace string, nodeName string) ([]netaddr.IPPrefix, error) {
 	m, err := h.GetMachine(namespace, nodeName)
 	if err != nil {
 		return nil, err
 	}
-	hi, err := m.GetHostInfo()
+
+	data, err := m.EnabledRoutes.MarshalJSON()
 	if err != nil {
 		return nil, err
 	}
-	route, err := netaddr.ParseIPPrefix(routeStr)
+
+	routesStr := []string{}
+	err = json.Unmarshal(data, &routesStr)
 	if err != nil {
 		return nil, err
 	}
 
-	for _, rIP := range hi.RoutableIPs {
-		if rIP == route {
-			routes, _ := json.Marshal([]string{routeStr}) // TODO: only one for the time being, so overwriting the rest
-			m.EnabledRoutes = datatypes.JSON(routes)
-			h.db.Save(&m)
+	routes := make([]netaddr.IPPrefix, len(routesStr))
+	for index, routeStr := range routesStr {
+		route, err := netaddr.ParseIPPrefix(routeStr)
+		if err != nil {
+			return nil, err
+		}
+		routes[index] = route
+	}
+
+	return routes, nil
+}
+
+func (h *Headscale) IsNodeRouteEnabled(namespace string, nodeName string, routeStr string) bool {
+	route, err := netaddr.ParseIPPrefix(routeStr)
+	if err != nil {
+		return false
+	}
+
+	enabledRoutes, err := h.GetEnabledNodeRoutes(namespace, nodeName)
+	if err != nil {
+		return false
+	}
+
+	for _, enabledRoute := range enabledRoutes {
+		if route == enabledRoute {
+			return true
+		}
+	}
+	return false
+}
+
+// EnableNodeRoute enables a subnet route advertised by a node (identified by
+// namespace and node name)
+func (h *Headscale) EnableNodeRoute(namespace string, nodeName string, routeStr string) error {
+	m, err := h.GetMachine(namespace, nodeName)
+	if err != nil {
+		return err
+	}
+
+	route, err := netaddr.ParseIPPrefix(routeStr)
+	if err != nil {
+		return err
+	}
+
+	availableRoutes, err := h.GetAdvertisedNodeRoutes(namespace, nodeName)
+	if err != nil {
+		return err
+	}
 
-			err = h.RequestMapUpdates(m.NamespaceID)
-			if err != nil {
-				return nil, err
+	enabledRoutes, err := h.GetEnabledNodeRoutes(namespace, nodeName)
+	if err != nil {
+		return err
+	}
+
+	available := false
+	for _, availableRoute := range *availableRoutes {
+		// If the route is available, and not yet enabled, add it to the new routing table
+		if route == availableRoute {
+			available = true
+			if !h.IsNodeRouteEnabled(namespace, nodeName, routeStr) {
+				enabledRoutes = append(enabledRoutes, route)
 			}
-			return &rIP, nil
 		}
 	}
-	return nil, errors.New("could not find routable range")
+
+	if !available {
+		return fmt.Errorf("route (%s) is not available on node %s", nodeName, routeStr)
+	}
+
+	routes, err := json.Marshal(enabledRoutes)
+	if err != nil {
+		return err
+	}
+
+	m.EnabledRoutes = datatypes.JSON(routes)
+	h.db.Save(&m)
+
+	err = h.RequestMapUpdates(m.NamespaceID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (h *Headscale) RoutesToPtables(namespace string, nodeName string, availableRoutes []netaddr.IPPrefix) pterm.TableData {
+	d := pterm.TableData{{"Route", "Enabled"}}
+
+	for _, route := range availableRoutes {
+		enabled := h.IsNodeRouteEnabled(namespace, nodeName, route.String())
+
+		d = append(d, []string{route.String(), strconv.FormatBool(enabled)})
+	}
+	return d
 }

routes_test.go

@@ -33,7 +33,7 @@ func (s *Suite) TestGetRoutes(c *check.C) {
 		MachineKey:     "foo",
 		NodeKey:        "bar",
 		DiscoKey:       "faa",
-		Name:           "testmachine",
+		Name:           "test_get_route_machine",
 		NamespaceID:    n.ID,
 		Registered:     true,
 		RegisterMethod: "authKey",
@@ -42,14 +42,87 @@ func (s *Suite) TestGetRoutes(c *check.C) {
 	}
 	h.db.Save(&m)
 
-	r, err := h.GetNodeRoutes("test", "testmachine")
+	r, err := h.GetAdvertisedNodeRoutes("test", "testmachine")
 	c.Assert(err, check.IsNil)
 	c.Assert(len(*r), check.Equals, 1)
 
-	_, err = h.EnableNodeRoute("test", "testmachine", "192.168.0.0/24")
+	err = h.EnableNodeRoute("test", "testmachine", "192.168.0.0/24")
 	c.Assert(err, check.NotNil)
 
-	_, err = h.EnableNodeRoute("test", "testmachine", "10.0.0.0/24")
+	err = h.EnableNodeRoute("test", "testmachine", "10.0.0.0/24")
+	c.Assert(err, check.IsNil)
+}
+
+func (s *Suite) TestGetEnableRoutes(c *check.C) {
+	n, err := h.CreateNamespace("test")
+	c.Assert(err, check.IsNil)
+
+	pak, err := h.CreatePreAuthKey(n.Name, false, false, nil)
 	c.Assert(err, check.IsNil)
 
+	_, err = h.GetMachine("test", "testmachine")
+	c.Assert(err, check.NotNil)
+
+	route, err := netaddr.ParseIPPrefix(
+		"10.0.0.0/24",
+	)
+	c.Assert(err, check.IsNil)
+
+	route2, err := netaddr.ParseIPPrefix(
+		"150.0.10.0/25",
+	)
+	c.Assert(err, check.IsNil)
+
+	hi := tailcfg.Hostinfo{
+		RoutableIPs: []netaddr.IPPrefix{route, route2},
+	}
+	hostinfo, err := json.Marshal(hi)
+	c.Assert(err, check.IsNil)
+
+	m := Machine{
+		ID:             0,
+		MachineKey:     "foo",
+		NodeKey:        "bar",
+		DiscoKey:       "faa",
+		Name:           "test_enable_route_machine",
+		NamespaceID:    n.ID,
+		Registered:     true,
+		RegisterMethod: "authKey",
+		AuthKeyID:      uint(pak.ID),
+		HostInfo:       datatypes.JSON(hostinfo),
+	}
+	h.db.Save(&m)
+
+	availableRoutes, err := h.GetAdvertisedNodeRoutes("test", "testmachine")
+	c.Assert(err, check.IsNil)
+	c.Assert(len(*availableRoutes), check.Equals, 2)
+
+	enabledRoutes, err := h.GetEnabledNodeRoutes("test", "testmachine")
+	c.Assert(err, check.IsNil)
+	c.Assert(len(enabledRoutes), check.Equals, 0)
+
+	err = h.EnableNodeRoute("test", "testmachine", "192.168.0.0/24")
+	c.Assert(err, check.NotNil)
+
+	err = h.EnableNodeRoute("test", "testmachine", "10.0.0.0/24")
+	c.Assert(err, check.IsNil)
+
+	enabledRoutes1, err := h.GetEnabledNodeRoutes("test", "testmachine")
+	c.Assert(err, check.IsNil)
+	c.Assert(len(enabledRoutes1), check.Equals, 1)
+
+	// Adding it twice will just let it pass through
+	err = h.EnableNodeRoute("test", "testmachine", "10.0.0.0/24")
+	c.Assert(err, check.IsNil)
+
+	enabledRoutes2, err := h.GetEnabledNodeRoutes("test", "testmachine")
+	c.Assert(err, check.IsNil)
+	c.Assert(len(enabledRoutes2), check.Equals, 1)
+
+	err = h.EnableNodeRoute("test", "testmachine", "150.0.10.0/25")
+	c.Assert(err, check.IsNil)
+
+	enabledRoutes3, err := h.GetEnabledNodeRoutes("test", "testmachine")
+	c.Assert(err, check.IsNil)
+	c.Assert(len(enabledRoutes3), check.Equals, 2)
 }