zones: env: use SetGateway()

Signed-off-by: Alejandro Mery <amery@jpi.io>

go.mod

@@ -8,6 +8,7 @@ require (
 	darvaza.org/sidecar v0.0.0-20230721122716-b9c54b8adbaf
 	darvaza.org/slog v0.5.2
 	github.com/burntSushi/toml v0.3.1
+	github.com/hack-pad/hackpadfs v0.2.1
 	github.com/mgechev/revive v1.3.2
 	github.com/spf13/cobra v1.7.0
 	golang.org/x/crypto v0.12.0

go.sum

@@ -26,6 +26,8 @@ github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBD
 github.com/fatih/structtag v1.2.0 h1:/OdNE99OxoI/PqaW/SuSK9uxxT3f/tcSZgon/ssNSx4=
 github.com/fatih/structtag v1.2.0/go.mod h1:mBJUNpUnHmRKrKlQQlmCrh5PuhftFbNv8Ys4/aAZl94=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/hack-pad/hackpadfs v0.2.1 h1:FelFhIhv26gyjujoA/yeFO+6YGlqzmc9la/6iKMIxMw=
+github.com/hack-pad/hackpadfs v0.2.1/go.mod h1:khQBuCEwGXWakkmq8ZiFUvUZz84ZkJ2KNwKvChs4OrU=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=

pkg/zones/env.go

@@ -78,27 +78,31 @@ func genEnvZoneNodes(z *Zone) string {
 	return strings.Join(s, " ")
 }
 
-func getRingZeroGatewayID(z *Zone) int {
-	var firstNodeID, gatewayID int
+func getRingZeroGatewayID(z *Zone) (int, error) {
+	var gatewayID int
+	var first *Machine
 
 	z.ForEachMachine(func(p *Machine) bool {
 		nodeID := p.ID()
 
-		if firstNodeID == 0 {
-			firstNodeID = nodeID
+		if first == nil {
+			first = p
 		}
 
-		if _, found := p.getRingInfo(0); found {
+		if p.IsGateway() {
 			gatewayID = nodeID
 		}
 
 		return gatewayID != 0
 	})
 
-	switch {
-	case gatewayID == 0:
-		return firstNodeID
-	default:
-		return gatewayID
+	if gatewayID == 0 {
+		gatewayID = first.ID()
+
+		if err := first.SetGateway(true); err != nil {
+			return gatewayID, err
+		}
 	}
+
+	return gatewayID, nil
 }

pkg/zones/machine.go

@@ -1,10 +1,7 @@
 package zones
 
 import (
-	"fmt"
-	"io/fs"
 	"net/netip"
-	"path/filepath"
 	"strconv"
 	"strings"
 	"sync"
@@ -61,28 +58,34 @@ func (m *Machine) FullName() string {
 	return m.Name
 }
 
-// ReadFile reads a file from the machine's config directory
-func (m *Machine) ReadFile(name string, args ...any) ([]byte, error) {
-	base := m.zone.zones.dir
-	fullName := m.getFilename(name, args...)
+// IsGateway tells if the Machine is a ring0 gateway
+func (m *Machine) IsGateway() bool {
+	m.mu.Lock()
+	defer m.mu.Unlock()
 
-	return fs.ReadFile(base, fullName)
-}
-
-func (m *Machine) getFilename(name string, args ...any) string {
-	if len(args) > 0 {
-		name = fmt.Sprintf(name, args...)
+	if ri, found := m.getRingInfo(0); found {
+		return ri.Enabled
 	}
 
-	s := []string{
-		m.zone.Name,
-		m.Name,
-		name,
-	}
-
-	return filepath.Join(s...)
+	return false
 }
 
+// SetGateway enables/disables a Machine ring0 integration
+func (m *Machine) SetGateway(enabled bool) error {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	ri, found := m.getRingInfo(0)
+	switch {
+	case !found && !enabled:
+		return nil
+	case !found:
+		return m.createRingInfo(0, true)
+	default:
+		ri.Enabled = enabled
+		return m.writeRingInfo(ri)
+	}
+}
 func (m *Machine) getPeerByName(name string) (*Machine, bool) {
 	return m.zone.zones.GetMachineByName(name)
 }

pkg/zones/machine_file.go

@@ -0,0 +1,63 @@
+package zones
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	fs "github.com/hack-pad/hackpadfs"
+)
+
+// OpenFile opens a file on the machine's config directory with the specified flags
+func (m *Machine) OpenFile(name string, flags int, args ...any) (fs.File, error) {
+	base := m.zone.zones.dir
+	fullName := m.getFilename(name, args...)
+
+	return fs.OpenFile(base, fullName, flags, 0644)
+}
+
+// CreateTruncFile creates or truncates a file on the machine's config directory
+func (m *Machine) CreateTruncFile(name string, args ...any) (fs.File, error) {
+	return m.OpenFile(name, os.O_RDWR|os.O_CREATE|os.O_TRUNC, args...)
+}
+
+// CreateFile creates a file on the machine's config directory
+func (m *Machine) CreateFile(name string, args ...any) (fs.File, error) {
+	return m.OpenFile(name, os.O_RDWR|os.O_CREATE, args...)
+}
+
+// RemoveFile deletes a file from the machine's config directory
+func (m *Machine) RemoveFile(name string, args ...any) error {
+	base := m.zone.zones.dir
+	fullName := m.getFilename(name, args...)
+	err := fs.Remove(base, fullName)
+
+	switch {
+	case os.IsNotExist(err):
+		return nil
+	default:
+		return err
+	}
+}
+
+// ReadFile reads a file from the machine's config directory
+func (m *Machine) ReadFile(name string, args ...any) ([]byte, error) {
+	base := m.zone.zones.dir
+	fullName := m.getFilename(name, args...)
+
+	return fs.ReadFile(base, fullName)
+}
+
+func (m *Machine) getFilename(name string, args ...any) string {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	s := []string{
+		m.zone.Name,
+		m.Name,
+		name,
+	}
+
+	return filepath.Join(s...)
+}

pkg/zones/machine_rings.go

@@ -3,6 +3,7 @@ package zones
 import (
 	"bytes"
 	"fmt"
+	"io/fs"
 	"os"
 
 	"darvaza.org/core"
@@ -134,3 +135,86 @@ func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 
 	return nil
 }
+
+func (m *Machine) createRingInfo(ring int, enabled bool) error {
+	keys, err := wireguard.NewKeyPair()
+	if err != nil {
+		return err
+	}
+
+	ri := &RingInfo{
+		Ring:    ring,
+		Enabled: enabled,
+		Keys:    keys,
+	}
+
+	err = m.applyRingInfo(ring, ri)
+	if err != nil {
+		return err
+	}
+
+	return m.writeRingInfo(ri)
+}
+
+func (m *Machine) writeRingInfo(ri *RingInfo) error {
+	var err error
+
+	if m == nil || ri == nil {
+		return fs.ErrInvalid
+	}
+
+	err = m.writeRingInfoPrivate(ri.Ring, ri.Keys.PrivateKey)
+	if err != nil {
+		return err
+	}
+
+	err = m.writeRingInfoPublic(ri.Ring, ri.Keys.PublicKey)
+	if err != nil {
+		return err
+	}
+
+	if !ri.Enabled {
+		return m.deleteRingInfoConf(ri.Ring)
+	}
+
+	return m.writeRingInfoConf(ri.Ring, ri.Keys.PrivateKey)
+}
+
+func (m *Machine) writeRingInfoPrivate(ring int, _ wireguard.PrivateKey) error {
+	f, err := m.CreateTruncFile("wg%v.key", ring)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return nil
+}
+func (m *Machine) writeRingInfoPublic(ring int, _ wireguard.PublicKey) error {
+	f, err := m.CreateTruncFile("wg%v.pub", ring)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return nil
+}
+func (m *Machine) writeRingInfoConf(ring int, _ wireguard.PrivateKey) error {
+	f, err := m.CreateTruncFile("wg%v.conf", ring)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	return nil
+}
+
+func (m *Machine) deleteRingInfoConf(ring int) error {
+	err := m.RemoveFile("wg%v.conf", ring)
+
+	switch err {
+	case os.ErrNotExist:
+		return nil
+	default:
+		return err
+	}
+}

pkg/zones/zones.go

@@ -3,7 +3,8 @@ package zones
 
 import (
 	"io/fs"
-	"os"
+
+	"github.com/hack-pad/hackpadfs/os"
 
 	"darvaza.org/resolver"
 )
@@ -32,6 +33,31 @@ func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
 	}
 }
 
+// SetGateway configures a machine to be the zone's ring0 gateway
+func (z *Zone) SetGateway(gatewayID int, enabled bool) error {
+	var err error
+	var found bool
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if p.ID() == gatewayID {
+			found = true
+			err = p.SetGateway(enabled)
+
+			return true
+		}
+		return false
+	})
+
+	switch {
+	case err != nil:
+		return err
+	case !found:
+		return fs.ErrNotExist
+	default:
+		return nil
+	}
+}
+
 // Zones represents all zones in a cluster
 type Zones struct {
 	dir      fs.FS
@@ -104,5 +130,10 @@ func NewFS(dir fs.FS, domain string) (*Zones, error) {
 
 // New builds a [Zones] tree using the given directory
 func New(dir, domain string) (*Zones, error) {
-	return NewFS(os.DirFS(dir), domain)
+	base, err := os.NewFS().Sub(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewFS(base, domain)
 }