zones: Machine.RemoveWireguardConfig()

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

cmd/jpictl/env.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"os"
+
+	"github.com/spf13/cobra"
+
+	"git.jpi.io/amery/jpictl/pkg/zones"
+)
+
+// Command
+var envCmd = &cobra.Command{
+	Use:   "env",
+	Short: "generates environment variables for shell scripts",
+	RunE: func(_ *cobra.Command, _ []string) error {
+		m, err := zones.New(cfg.Base, cfg.Domain)
+		if err != nil {
+			return err
+		}
+
+		return m.WriteEnv(os.Stdout)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(envCmd)
+}

go.mod

@@ -8,8 +8,10 @@ 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
 	gopkg.in/gcfg.v1 v1.2.3
 )
 

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=
@@ -70,6 +72,8 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 github.com/stretchr/testify v1.8.2/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4=
 github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+golang.org/x/crypto v0.12.0 h1:tFM/ta59kqch6LlvYnPa0yx5a83cL2nHflFhYKvv9Yk=
+golang.org/x/crypto v0.12.0/go.mod h1:NF0Gs7EO5K4qLn+Ylc+fih8BSTeIjAP05siRnAh98yw=
 golang.org/x/exp v0.0.0-20230713183714-613f0c0eb8a1 h1:MGwJjxBy0HJshjDNfLsYO8xppfqWlA5ZT9OhtUUhTNw=
 golang.org/x/mod v0.12.0 h1:rmsUpXtvNzj340zd98LZ4KntptpfRHwpFOHG188oHXc=
 golang.org/x/mod v0.12.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=

pkg/wireguard/config.go

@@ -31,13 +31,13 @@ func (f *Config) Peers() int {
 // InterfaceConfig represents the [Interface] section
 type InterfaceConfig struct {
 	Address    netip.Addr
-	PrivateKey BinaryKey
+	PrivateKey PrivateKey
 	ListenPort uint16
 }
 
 // PeerConfig represents a [Peer] section
 type PeerConfig struct {
-	PublicKey  BinaryKey
+	PublicKey  PublicKey
 	Endpoint   EndpointAddress
 	AllowedIPs []netip.Prefix
 }
@@ -135,7 +135,7 @@ func (p interfaceConfig) Export() (InterfaceConfig, error) {
 		ListenPort: p.ListenPort,
 	}
 
-	out.PrivateKey, err = BinaryKeyFromBase64(p.PrivateKey)
+	out.PrivateKey, err = PrivateKeyFromBase64(p.PrivateKey)
 	if err != nil {
 		err = core.Wrap(err, "PrivateKey")
 		return InterfaceConfig{}, err
@@ -162,7 +162,7 @@ func (v *intermediateConfig) ExportPeer(i int) (PeerConfig, error) {
 	}
 
 	// PublicKey
-	out.PublicKey, err = BinaryKeyFromBase64(v.Peer.PublicKey[i])
+	out.PublicKey, err = PublicKeyFromBase64(v.Peer.PublicKey[i])
 	if err != nil {
 		err = core.Wrap(err, "PublicKey")
 		return out, err

pkg/wireguard/keys.go

@@ -2,35 +2,180 @@ package wireguard
 
 import (
 	"bytes"
+	"crypto/rand"
 	"encoding/base64"
+	"errors"
+
+	"golang.org/x/crypto/curve25519"
 )
 
-// BinaryKey is a binary blob
-type BinaryKey []byte
+const (
+	// PrivateKeySize is the length in bytes of a Wireguard Private Key
+	PrivateKeySize = 32
+	// PublicKeySize is the length in bytes of a Wireguard Public Key
+	PublicKeySize = 32
+)
 
-func (k BinaryKey) String() string {
-	return base64.StdEncoding.EncodeToString(k)
+var (
+	// ErrInvalidKeySize indicates the key size is wrong
+	ErrInvalidKeySize = errors.New("invalid key size")
+	// ErrInvalidPrivateKey indicates the private key is invalid
+	ErrInvalidPrivateKey = errors.New("invalid private key")
+	// ErrInvalidPublicKey indicates the public key is invalid
+	ErrInvalidPublicKey = errors.New("invalid public key")
+)
+
+type (
+	// PrivateKey is a binary Wireguard Private Key
+	PrivateKey [PrivateKeySize]byte
+	// PublicKey is a binary Wireguard Public Key
+	PublicKey [PublicKeySize]byte
+)
+
+func (key PrivateKey) String() string {
+	switch {
+	case key.IsZero():
+		return ""
+	default:
+		return base64.StdEncoding.EncodeToString(key[:])
+	}
+}
+
+func (pub PublicKey) String() string {
+	switch {
+	case pub.IsZero():
+		return ""
+	default:
+		return base64.StdEncoding.EncodeToString(pub[:])
+	}
 }
 
 // IsZero tells if the key hasn't been set
-func (k BinaryKey) IsZero() bool {
-	return len(k) == 0
+func (key PrivateKey) IsZero() bool {
+	var zero PrivateKey
+	return key.Equal(zero)
 }
 
-// Equal checks if two keys are identical
-func (k BinaryKey) Equal(alter BinaryKey) bool {
-	return bytes.Equal(k, alter)
+// IsZero tells if the key hasn't been set
+func (pub PublicKey) IsZero() bool {
+	var zero PublicKey
+	return pub.Equal(zero)
 }
 
-// BinaryKeyFromBase64 decodes a base64-based string into
-// a [BinaryKey]
-func BinaryKeyFromBase64(data string) (BinaryKey, error) {
+// Equal checks if two private keys are identical
+func (key PrivateKey) Equal(alter PrivateKey) bool {
+	return bytes.Equal(key[:], alter[:])
+}
+
+// Equal checks if two public keys are identical
+func (pub PublicKey) Equal(alter PublicKey) bool {
+	return bytes.Equal(pub[:], alter[:])
+}
+
+// PrivateKeyFromBase64 decodes a base64-based string into
+// a [PrivateKey]
+func PrivateKeyFromBase64(data string) (PrivateKey, error) {
+	b, err := decodeKey(data, PrivateKeySize)
+	if err != nil {
+		var zero PrivateKey
+		return zero, err
+	}
+	return *(*[PrivateKeySize]byte)(b), nil
+}
+
+// PublicKeyFromBase64 decodes a base64-based string into
+// a [PublicKey]
+func PublicKeyFromBase64(data string) (PublicKey, error) {
+	b, err := decodeKey(data, PublicKeySize)
+	if err != nil {
+		var zero PublicKey
+		return zero, err
+	}
+	return *(*[PublicKeySize]byte)(b), nil
+}
+
+func decodeKey(data string, size int) ([]byte, error) {
 	b, err := base64.StdEncoding.DecodeString(data)
-	return BinaryKey(b), err
+	switch {
+	case err != nil:
+		return []byte{}, err
+	case len(b) != size:
+		err = ErrInvalidKeySize
+		return []byte{}, err
+	default:
+		return b, nil
+	}
+}
+
+// NewPrivateKey creates a new PrivateKey
+func NewPrivateKey() (PrivateKey, error) {
+	var s [PrivateKeySize]byte
+
+	_, err := rand.Read(s[:])
+	if err != nil {
+		var zero PrivateKey
+		return zero, err
+	}
+
+	// apply same clamping as wireguard-go/device/noise-helpers.go
+	s[0] &= 0xf8
+	s[31] = (s[31] & 0x7f) | 0x40
+
+	return s, nil
+}
+
+// Public generates the corresponding PublicKey
+func (key PrivateKey) Public() PublicKey {
+	var pub PublicKey
+	if !key.IsZero() {
+		in := (*[PrivateKeySize]byte)(&key)
+		out := (*[PublicKeySize]byte)(&pub)
+
+		curve25519.ScalarBaseMult(out, in)
+	}
+	return pub
 }
 
 // KeyPair holds a Key pair
 type KeyPair struct {
-	PrivateKey BinaryKey
-	PublicKey  BinaryKey
+	PrivateKey PrivateKey
+	PublicKey  PublicKey
+}
+
+// Validate checks the PublicKey matches the PrivateKey,
+// and sets the PublicKey if missing
+func (kp *KeyPair) Validate() error {
+	keyLen := len(kp.PrivateKey)
+	pubLen := len(kp.PublicKey)
+
+	switch {
+	case keyLen != PrivateKeySize:
+		// bad private key
+		return ErrInvalidPrivateKey
+	case pubLen == 0:
+		// no public key, set it
+		kp.PublicKey = kp.PrivateKey.Public()
+		return nil
+	case pubLen != PublicKeySize:
+		// bad public key
+		return ErrInvalidPublicKey
+	case !kp.PrivateKey.Public().Equal(kp.PublicKey):
+		// wrong public key
+		return ErrInvalidPublicKey
+	default:
+		// correct public key
+		return nil
+	}
+}
+
+// NewKeyPair creates a new KeyPair for Wireguard
+func NewKeyPair() (KeyPair, error) {
+	var out KeyPair
+
+	key, err := NewPrivateKey()
+	if err == nil {
+		out.PrivateKey = key
+		out.PublicKey = key.Public()
+	}
+	return out, nil
 }

pkg/zones/env.go

@@ -0,0 +1,102 @@
+package zones
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strings"
+)
+
+// WriteEnv generates environment variables for shell scripts
+func (m *Zones) WriteEnv(w io.Writer) error {
+	var buf bytes.Buffer
+
+	m.writeEnvVarFn(&buf, genEnvZones, "ZONES")
+	m.ForEachZone(func(z *Zone) bool {
+		m.writeEnvZone(&buf, z)
+		return false
+	})
+
+	_, err := buf.WriteTo(w)
+	return err
+}
+
+func (m *Zones) writeEnvZone(w io.Writer, z *Zone) {
+	zoneID := z.ID
+
+	// ZONE{zoneID}
+	m.writeEnvVar(w, genEnvZoneNodes(z), "ZONE%v", zoneID)
+
+	// ZONE{zoneID}_NAME
+	m.writeEnvVar(w, z.Name, "ZONE%v_%s", zoneID, "NAME")
+
+	// ZONE{zoneID}_GW
+	gatewayID := getRingZeroGatewayID(z)
+	m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
+
+	// ZONE{zoneID}_IP
+	ip, _ := RingZeroAddress(zoneID, gatewayID)
+	m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
+}
+
+func (m *Zones) writeEnvVarFn(w io.Writer, fn func(*Zones) string, name string, args ...any) {
+	var value string
+
+	if fn != nil {
+		value = fn(m)
+	}
+
+	m.writeEnvVar(w, value, name, args...)
+}
+
+func (*Zones) writeEnvVar(w io.Writer, value string, name string, args ...any) {
+	if len(args) > 0 {
+		name = fmt.Sprintf(name, args...)
+	}
+
+	if name != "" {
+		value = strings.TrimSpace(value)
+
+		_, _ = fmt.Fprintf(w, "%s=%q\n", name, value)
+	}
+}
+
+func genEnvZones(m *Zones) string {
+	s := make([]string, 0, len(m.Zones))
+	for _, z := range m.Zones {
+		s = append(s, fmt.Sprintf("%v", z.ID))
+	}
+
+	return strings.Join(s, " ")
+}
+
+func genEnvZoneNodes(z *Zone) string {
+	s := make([]string, 0, len(z.Machines))
+	for _, p := range z.Machines {
+		s = append(s, p.Name)
+	}
+	return strings.Join(s, " ")
+}
+
+func getRingZeroGatewayID(z *Zone) int {
+	var firstNodeID, gatewayID int
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if firstNodeID == 0 {
+			firstNodeID = p.ID
+		}
+
+		if p.IsGateway() {
+			gatewayID = p.ID
+		}
+
+		return gatewayID != 0
+	})
+
+	switch {
+	case gatewayID == 0:
+		return firstNodeID
+	default:
+		return gatewayID
+	}
+}

pkg/zones/machine.go

@@ -1,52 +1,24 @@
 package zones
 
 import (
-	"fmt"
-	"io/fs"
 	"net/netip"
-	"path/filepath"
-	"strconv"
 	"strings"
-	"sync"
 )
 
 // A Machine is a machine on a Zone
 type Machine struct {
-	mu sync.Mutex
-
 	zone *Zone
-	id   int
+	ID   int
 	Name string `toml:"name"`
 
 	PublicAddresses []netip.Addr `toml:"public,omitempty"`
-	RingAddresses   []*RingInfo  `toml:"rings,omitempty"`
+	Rings           []*RingInfo  `toml:"rings,omitempty"`
 }
 
 func (m *Machine) String() string {
 	return m.Name
 }
 
-// ID return the index within the [Zone] associated to this [Machine]
-func (m *Machine) ID() int {
-	m.mu.Lock()
-	defer m.mu.Unlock()
-
-	if m.id == 0 {
-		zoneName := m.zone.Name
-
-		s := m.Name[len(zoneName)+1:]
-
-		id, err := strconv.ParseInt(s, 10, 8)
-		if err != nil {
-			panic(err)
-		}
-
-		m.id = int(id)
-	}
-
-	return m.id
-}
-
 // FullName returns the Name of the machine including domain name
 func (m *Machine) FullName() string {
 	if domain := m.zone.zones.domain; domain != "" {
@@ -61,26 +33,10 @@ 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...)
-
-	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...)
+// IsGateway tells if the Machine is a ring0 gateway
+func (m *Machine) IsGateway() bool {
+	_, ok := m.getRingInfo(0)
+	return ok
 }
 
 func (m *Machine) getPeerByName(name string) (*Machine, bool) {

pkg/zones/machine_file.go

@@ -0,0 +1,87 @@
+package zones
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"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) (io.WriteCloser, error) {
+	return m.openWriter(name, 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) (io.WriteCloser, error) {
+	return m.openWriter(name, os.O_CREATE, args...)
+}
+
+func (m *Machine) openWriter(name string, flags int, args ...any) (io.WriteCloser, error) {
+	f, err := m.OpenFile(name, os.O_WRONLY|flags, args...)
+	if err != nil {
+		return nil, err
+	}
+
+	return f.(io.WriteCloser), nil
+}
+
+// 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)
+}
+
+// WriteStringFile writes the given content to a file on the machine's config directory
+func (m *Machine) WriteStringFile(value string, name string, args ...any) error {
+	f, err := m.CreateTruncFile(name, args...)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	buf := bytes.NewBufferString(value)
+	_, err = buf.WriteTo(f)
+	return err
+}
+
+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"
@@ -10,6 +11,122 @@ import (
 	"git.jpi.io/amery/jpictl/pkg/wireguard"
 )
 
+// GetWireguardKeys reads a wgN.key/wgN.pub files
+func (m *Machine) GetWireguardKeys(ring int) (wireguard.KeyPair, error) {
+	var (
+		data []byte
+		err  error
+		out  wireguard.KeyPair
+	)
+
+	data, err = m.ReadFile("wg%v.key", ring)
+	if err != nil {
+		// failed to read
+		return out, err
+	}
+
+	out.PrivateKey, err = wireguard.PrivateKeyFromBase64(string(data))
+	if err != nil {
+		// bad key
+		err = core.Wrapf(err, "wg%v.key", ring)
+		return out, err
+	}
+
+	data, err = m.ReadFile("wg%v.pub", ring)
+	switch {
+	case os.IsNotExist(err):
+		// no wgN.pub is fine
+	case err != nil:
+		// failed to read
+		return out, err
+	default:
+		// good read
+		out.PublicKey, err = wireguard.PublicKeyFromBase64(string(data))
+		if err != nil {
+			// bad key
+			err = core.Wrapf(err, "wg%v.pub", ring)
+			return out, err
+		}
+	}
+
+	err = out.Validate()
+	return out, err
+}
+
+func (m *Machine) tryReadWireguardKeys(ring int) error {
+	kp, err := m.GetWireguardKeys(ring)
+	switch {
+	case os.IsNotExist(err):
+		// ignore
+		return nil
+	case err != nil:
+		// something went wrong
+		return err
+	default:
+		// import keys
+		ri := &RingInfo{
+			Ring: ring,
+			Keys: kp,
+		}
+
+		return m.applyRingInfo(ring, ri)
+	}
+}
+
+// WriteWireguardKeys writes the wgN.key/wgN.pub files
+func (m *Machine) WriteWireguardKeys(ring int) error {
+	var err error
+	var key, pub string
+	var ri *RingInfo
+
+	ri, _ = m.getRingInfo(ring)
+	if ri != nil {
+		key = ri.Keys.PrivateKey.String()
+		pub = ri.Keys.PublicKey.String()
+	}
+
+	switch {
+	case key == "":
+		return fs.ErrNotExist
+	case pub == "":
+		pub = ri.Keys.PrivateKey.Public().String()
+	}
+
+	err = m.WriteStringFile(key, "wg%v.key", ring)
+	if err != nil {
+		return err
+	}
+
+	err = m.WriteStringFile(pub, "wg%v.pub", ring)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// RemoveWireguardKeys deletes wgN.key and wgN.pub from
+// the machine's config directory
+func (m *Machine) RemoveWireguardKeys(ring int) error {
+	var err error
+
+	err = m.RemoveFile("wg%v.pub", ring)
+	switch {
+	case os.IsNotExist(err):
+		// ignore
+	case err != nil:
+		return err
+	}
+
+	err = m.RemoveFile("wg%v.key", ring)
+	if os.IsNotExist(err) {
+		// ignore
+		err = nil
+	}
+
+	return err
+}
+
 // GetWireguardConfig reads a wgN.conf file
 func (m *Machine) GetWireguardConfig(ring int) (*wireguard.Config, error) {
 	data, err := m.ReadFile("wg%v.conf", ring)
@@ -60,19 +177,21 @@ func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
 	return nil
 }
 
-func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
-	var cur *RingInfo
-
-	for _, ri := range m.RingAddresses {
+func (m *Machine) getRingInfo(ring int) (*RingInfo, bool) {
+	for _, ri := range m.Rings {
 		if ri.Ring == ring {
-			cur = ri
-			break
+			return ri, ri.Enabled
 		}
 	}
 
+	return nil, false
+}
+
+func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
+	cur, _ := m.getRingInfo(ring)
 	if cur == nil {
 		// first, append
-		m.RingAddresses = append(m.RingAddresses, new)
+		m.Rings = append(m.Rings, new)
 		return nil
 	}
 
@@ -84,8 +203,7 @@ func (m *Machine) applyWireguardInterfaceConfig(ring int, data wireguard.Interfa
 	ri := &RingInfo{
 		Ring:    ring,
 		Enabled: true,
-		Address: data.Address,
-		Keys: &wireguard.KeyPair{
+		Keys: wireguard.KeyPair{
 			PrivateKey: data.PrivateKey,
 		},
 	}
@@ -105,7 +223,7 @@ func (m *Machine) applyWireguardPeerConfig(ring int, pc wireguard.PeerConfig) er
 		ri := &RingInfo{
 			Ring:    ring,
 			Enabled: true,
-			Keys: &wireguard.KeyPair{
+			Keys: wireguard.KeyPair{
 				PublicKey: pc.PublicKey,
 			},
 		}
@@ -122,8 +240,8 @@ func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 		return fmt.Errorf("invalid %s", "zoneID")
 	case nodeID == 0:
 		return fmt.Errorf("invalid %s", "nodeID")
-	case m.ID() != nodeID:
-		return fmt.Errorf("invalid %s: %v ≠ %v", "zoneID", m.ID(), nodeID)
+	case m.ID != nodeID:
+		return fmt.Errorf("invalid %s: %v ≠ %v", "zoneID", m.ID, nodeID)
 	case m.zone.ID != 0 && m.zone.ID != zoneID:
 		return fmt.Errorf("invalid %s: %v ≠ %v", "zoneID", m.zone.ID, zoneID)
 	case m.zone.ID == 0:
@@ -132,3 +250,14 @@ func (m *Machine) applyZoneNodeID(zoneID, nodeID int) error {
 
 	return nil
 }
+
+// RemoveWireguardConfig deletes wgN.conf from the machine's
+// config directory.
+func (m *Machine) RemoveWireguardConfig(ring int) error {
+	err := m.RemoveFile("wg%v.conf", ring)
+	if os.IsNotExist(err) {
+		err = nil
+	}
+
+	return err
+}

pkg/zones/machine_scan.go

@@ -3,6 +3,7 @@ package zones
 import (
 	"context"
 	"net/netip"
+	"strconv"
 	"time"
 )
 
@@ -25,6 +26,32 @@ func (m *Machine) updatePublicAddresses() error {
 	return nil
 }
 
+func (m *Machine) init() error {
+	if err := m.setID(); err != nil {
+		return err
+	}
+
+	for i := 0; i < RingsCount; i++ {
+		if err := m.tryReadWireguardKeys(i); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (m *Machine) setID() error {
+	zoneName := m.zone.Name
+	suffix := m.Name[len(zoneName)+1:]
+
+	id, err := strconv.ParseInt(suffix, 10, 8)
+	if err != nil {
+		return err
+	}
+
+	m.ID = int(id)
+	return nil
+}
+
 func (m *Machine) scan() error {
 	for i := 0; i < RingsCount; i++ {
 		if err := m.tryApplyWireguardConfig(i); err != nil {

pkg/zones/rings.go

@@ -14,75 +14,58 @@ const (
 	MaxNodeID = 0xff - 1
 	// RingsCount indicates how many wireguard rings we have
 	RingsCount = 2
+	// RingZeroPort is the port wireguard uses for ring0
+	RingZeroPort = 51800
+	// RingOnePort is the port wireguard uses for ring1
+	RingOnePort = 51810
 )
 
 // RingInfo contains represents the Wireguard endpoint details
 // for a Machine on a particular ring
 type RingInfo struct {
-	Ring    int                `toml:"ring"`
-	Enabled bool               `toml:"enabled,omitempty"`
-	Keys    *wireguard.KeyPair `toml:"keys,omitempty"`
-	Address netip.Addr         `toml:"address,omitempty"`
+	Ring    int               `toml:"ring"`
+	Enabled bool              `toml:"enabled,omitempty"`
+	Keys    wireguard.KeyPair `toml:"keys,omitempty"`
 }
 
 // Merge attempts to combine two RingInfo structs
 func (ri *RingInfo) Merge(alter *RingInfo) error {
 	switch {
+	case alter == nil:
+		return nil
 	case ri.Ring != alter.Ring:
 		// different ring
 		return fmt.Errorf("invalid %s: %v ≠ %v", "ring", ri.Ring, alter.Ring)
-	case ri.Enabled != alter.Enabled:
-		// different state
-		return fmt.Errorf("invalid %s: %v ≠ %v", "enabled", ri.Enabled, alter.Enabled)
-	case !canMergeAddress(ri.Address, alter.Address):
-		// different address
-		return fmt.Errorf("invalid %s: %v ≠ %v", "address", ri.Address, alter.Address)
+	case ri.Enabled && !alter.Enabled:
+		// can't disable via Merge
+		return fmt.Errorf("invalid %s: %v → %v", "enabled", ri.Enabled, alter.Enabled)
 	case !canMergeKeyPairs(ri.Keys, alter.Keys):
 		// incompatible keypairs
 		return fmt.Errorf("invalid %s: %s ≠ %s", "keys", ri.Keys, alter.Keys)
 	}
 
-	switch {
-	case ri.Keys == nil:
-		// assign keypair
-		ri.Keys = alter.Keys
-	case alter.Keys != nil:
-		// fill the gaps on our keypair
-		if ri.Keys.PrivateKey.IsZero() {
-			ri.Keys.PrivateKey = alter.Keys.PrivateKey
-		}
-		if ri.Keys.PublicKey.IsZero() {
-			ri.Keys.PublicKey = alter.Keys.PublicKey
-		}
+	return ri.unsafeMerge(alter)
+}
+
+func (ri *RingInfo) unsafeMerge(alter *RingInfo) error {
+	// enable via Merge
+	if alter.Enabled {
+		ri.Enabled = true
 	}
 
-	if addressEqual(ri.Address, netip.Addr{}) {
-		// assign address
-		ri.Address = alter.Address
+	// fill the gaps on our keypair
+	if ri.Keys.PrivateKey.IsZero() {
+		ri.Keys.PrivateKey = alter.Keys.PrivateKey
+	}
+	if ri.Keys.PublicKey.IsZero() {
+		ri.Keys.PublicKey = alter.Keys.PublicKey
 	}
 
 	return nil
 }
 
-func canMergeAddress(ip1, ip2 netip.Addr) bool {
-	var zero netip.Addr
-
+func canMergeKeyPairs(p1, p2 wireguard.KeyPair) bool {
 	switch {
-	case addressEqual(ip1, zero) || addressEqual(ip2, zero) || addressEqual(ip1, ip2):
-		return true
-	default:
-		return false
-	}
-}
-
-func addressEqual(ip1, ip2 netip.Addr) bool {
-	return ip1.Compare(ip2) == 0
-}
-
-func canMergeKeyPairs(p1, p2 *wireguard.KeyPair) bool {
-	switch {
-	case p1 == nil || p2 == nil:
-		return true
 	case !p1.PrivateKey.IsZero() && !p2.PrivateKey.IsZero() && !p1.PrivateKey.Equal(p2.PrivateKey):
 		return false
 	case !p1.PublicKey.IsZero() && !p2.PublicKey.IsZero() && !p1.PublicKey.Equal(p2.PublicKey):
@@ -96,6 +79,7 @@ func canMergeKeyPairs(p1, p2 *wireguard.KeyPair) bool {
 // Wireguard ring
 type RingAddressEncoder struct {
 	ID     int
+	Port   uint16
 	Encode func(zoneID, nodeID int) (netip.Addr, bool)
 	Decode func(addr netip.Addr) (zoneID, nodeID int, ok bool)
 }
@@ -104,12 +88,14 @@ var (
 	// RingZero is a wg0 address encoder/decoder
 	RingZero = RingAddressEncoder{
 		ID:     0,
+		Port:   RingZeroPort,
 		Decode: ParseRingZeroAddress,
 		Encode: RingZeroAddress,
 	}
 	// RingOne is a wg1 address encoder/decoder
 	RingOne = RingAddressEncoder{
 		ID:     1,
+		Port:   RingOnePort,
 		Decode: ParseRingOneAddress,
 		Encode: RingOneAddress,
 	}

pkg/zones/scan.go

@@ -93,8 +93,8 @@ func (m *Zones) scanSort() error {
 
 	m.ForEachZone(func(z *Zone) bool {
 		sort.SliceStable(z.Machines, func(i, j int) bool {
-			id1 := z.Machines[i].ID()
-			id2 := z.Machines[j].ID()
+			id1 := z.Machines[i].ID
+			id2 := z.Machines[j].ID
 			return id1 < id2
 		})
 
@@ -102,9 +102,9 @@ func (m *Zones) scanSort() error {
 	})
 
 	m.ForEachMachine(func(p *Machine) bool {
-		sort.SliceStable(p.RingAddresses, func(i, j int) bool {
-			ri1 := p.RingAddresses[i]
-			ri2 := p.RingAddresses[j]
+		sort.SliceStable(p.Rings, func(i, j int) bool {
+			ri1 := p.Rings[i]
+			ri2 := p.Rings[j]
 
 			return ri1.Ring < ri2.Ring
 		})
@@ -129,6 +129,10 @@ func (z *Zone) scan() error {
 				Name: e.Name(),
 			}
 
+			if err := m.init(); err != nil {
+				return err
+			}
+
 			z.Machines = append(z.Machines, m)
 		}
 	}

pkg/zones/zones.go

@@ -3,7 +3,8 @@ package zones
 
 import (
 	"io/fs"
-	"os"
+
+	"github.com/hack-pad/hackpadfs/os"
 
 	"darvaza.org/resolver"
 )
@@ -22,6 +23,16 @@ func (z *Zone) String() string {
 	return z.Name
 }
 
+// ForEachMachine calls a function for each Machine in the zone
+// until instructed to terminate the loop
+func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
+	for _, p := range z.Machines {
+		if fn(p) {
+			return
+		}
+	}
+}
+
 // Zones represents all zones in a cluster
 type Zones struct {
 	dir      fs.FS
@@ -32,18 +43,22 @@ type Zones struct {
 }
 
 // ForEachMachine calls a function for each Machine in the cluster
+// until instructed to terminate the loop
 func (m *Zones) ForEachMachine(fn func(*Machine) bool) {
-	for _, z := range m.Zones {
-		for _, p := range z.Machines {
-			if fn(p) {
-				// terminate
-				return
-			}
-		}
-	}
+	m.ForEachZone(func(z *Zone) bool {
+		var term bool
+
+		z.ForEachMachine(func(p *Machine) bool {
+			term = fn(p)
+			return term
+		})
+
+		return term
+	})
 }
 
 // ForEachZone calls a function for each Zone in the cluster
+// until instructed to terminate the loop
 func (m *Zones) ForEachZone(fn func(*Zone) bool) {
 	for _, p := range m.Zones {
 		if fn(p) {
@@ -90,5 +105,10 @@ 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)
 }