zones: Machine.CreateFile() and Machine.CreateTruncFile()

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

pkg/wireguard/keys.go

@@ -27,71 +27,60 @@ var (
 
 type (
 	// PrivateKey is a binary Wireguard Private Key
-	PrivateKey [PrivateKeySize]byte
+	PrivateKey []byte
 	// PublicKey is a binary Wireguard Public Key
-	PublicKey [PublicKeySize]byte
+	PublicKey []byte
 )
 
 func (key PrivateKey) String() string {
-	switch {
+	return encodeKey(key)
-	case key.IsZero():
-		return ""
-	default:
-		return base64.StdEncoding.EncodeToString(key[:])
-	}
 }
 
 func (pub PublicKey) String() string {
-	switch {
+	return encodeKey(pub)
-	case pub.IsZero():
-		return ""
-	default:
-		return base64.StdEncoding.EncodeToString(pub[:])
-	}
 }
 
 // IsZero tells if the key hasn't been set
 func (key PrivateKey) IsZero() bool {
-	var zero PrivateKey
+	return len(key) == 0
-	return key.Equal(zero)
 }
 
 // IsZero tells if the key hasn't been set
 func (pub PublicKey) IsZero() bool {
-	var zero PublicKey
+	return len(pub) == 0
-	return pub.Equal(zero)
 }
 
 // Equal checks if two private keys are identical
 func (key PrivateKey) Equal(alter PrivateKey) bool {
-	return bytes.Equal(key[:], alter[:])
+	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[:])
+	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 {
+	return b, err
-		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 {
+	return b, err
-		var zero PublicKey
+}
-		return zero, err
+
+func encodeKey(b []byte) string {
+	switch {
+	case len(b) == 0:
+		return ""
+	default:
+		return base64.StdEncoding.EncodeToString(b)
 	}
-	return *(*[PublicKeySize]byte)(b), nil
 }
 
 func decodeKey(data string, size int) ([]byte, error) {
@@ -113,27 +102,27 @@ func NewPrivateKey() (PrivateKey, error) {
 
 	_, err := rand.Read(s[:])
 	if err != nil {
-		var zero PrivateKey
+		return []byte{}, err
-		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
+	return s[:], nil
 }
 
 // Public generates the corresponding PublicKey
 func (key PrivateKey) Public() PublicKey {
-	var pub PublicKey
+	if len(key) != PrivateKeySize {
-	if !key.IsZero() {
+		return []byte{}
-		in := (*[PrivateKeySize]byte)(&key)
-		out := (*[PublicKeySize]byte)(&pub)
-
-		curve25519.ScalarBaseMult(out, in)
 	}
-	return pub
+
+	out := [PublicKeySize]byte{}
+	in := (*[PrivateKeySize]byte)(key)
+
+	curve25519.ScalarBaseMult(&out, in)
+	return out[:]
 }
 
 // KeyPair holds a Key pair
@@ -169,13 +158,15 @@ func (kp *KeyPair) Validate() error {
 }
 
 // NewKeyPair creates a new KeyPair for Wireguard
-func NewKeyPair() (KeyPair, error) {
+func NewKeyPair() (*KeyPair, error) {
-	var out KeyPair
-
 	key, err := NewPrivateKey()
-	if err == nil {
+	if err != nil {
-		out.PrivateKey = key
+		return nil, err
-		out.PublicKey = key.Public()
+	}
+
+	out := &KeyPair{
+		PrivateKey: key,
+		PublicKey:  key.Public(),
 	}
 	return out, nil
 }

pkg/zones/env.go

@@ -82,12 +82,14 @@ func getRingZeroGatewayID(z *Zone) int {
 	var firstNodeID, gatewayID int
 
 	z.ForEachMachine(func(p *Machine) bool {
+		nodeID := p.ID()
+
 		if firstNodeID == 0 {
-			firstNodeID = p.ID
+			firstNodeID = nodeID
 		}
 
-		if p.IsGateway() {
+		if _, found := p.getRingInfo(0); found {
-			gatewayID = p.ID
+			gatewayID = nodeID
 		}
 
 		return gatewayID != 0

pkg/zones/machine.go

@@ -2,23 +2,48 @@ package zones
 
 import (
 	"net/netip"
+	"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"`
-	Rings           []*RingInfo  `toml:"rings,omitempty"`
+	RingAddresses   []*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 != "" {
@@ -33,12 +58,6 @@ func (m *Machine) FullName() string {
 	return m.Name
 }
 
-// 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) {
 	return m.zone.zones.GetMachineByName(name)
 }

pkg/zones/machine_file.go

@@ -1,9 +1,7 @@
 package zones
 
 import (
-	"bytes"
 	"fmt"
-	"io"
 	"os"
 	"path/filepath"
 
@@ -19,22 +17,13 @@ func (m *Machine) OpenFile(name string, flags int, args ...any) (fs.File, error)
 }
 
 // CreateTruncFile creates or truncates a file on the machine's config directory
-func (m *Machine) CreateTruncFile(name string, args ...any) (io.WriteCloser, error) {
+func (m *Machine) CreateTruncFile(name string, args ...any) (fs.File, error) {
-	return m.openWriter(name, os.O_CREATE|os.O_TRUNC, args...)
+	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) (io.WriteCloser, error) {
+func (m *Machine) CreateFile(name string, args ...any) (fs.File, error) {
-	return m.openWriter(name, os.O_CREATE, args...)
+	return m.OpenFile(name, os.O_RDWR|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
@@ -59,19 +48,6 @@ func (m *Machine) ReadFile(name string, args ...any) ([]byte, error) {
 	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...)

pkg/zones/machine_rings.go

@@ -3,7 +3,6 @@ package zones
 import (
 	"bytes"
 	"fmt"
-	"io/fs"
 	"os"
 
 	"darvaza.org/core"
@@ -12,24 +11,25 @@ import (
 )
 
 // GetWireguardKeys reads a wgN.key/wgN.pub files
-func (m *Machine) GetWireguardKeys(ring int) (wireguard.KeyPair, error) {
+func (m *Machine) GetWireguardKeys(ring int) (*wireguard.KeyPair, error) {
 	var (
 		data []byte
 		err  error
-		out  wireguard.KeyPair
+		key  wireguard.PrivateKey
+		pub  wireguard.PublicKey
 	)
 
 	data, err = m.ReadFile("wg%v.key", ring)
 	if err != nil {
 		// failed to read
-		return out, err
+		return nil, err
 	}
 
-	out.PrivateKey, err = wireguard.PrivateKeyFromBase64(string(data))
+	key, err = wireguard.PrivateKeyFromBase64(string(data))
 	if err != nil {
 		// bad key
 		err = core.Wrapf(err, "wg%v.key", ring)
-		return out, err
+		return nil, err
 	}
 
 	data, err = m.ReadFile("wg%v.pub", ring)
@@ -38,19 +38,27 @@ func (m *Machine) GetWireguardKeys(ring int) (wireguard.KeyPair, error) {
 		// no wgN.pub is fine
 	case err != nil:
 		// failed to read
-		return out, err
+		return nil, err
 	default:
 		// good read
-		out.PublicKey, err = wireguard.PublicKeyFromBase64(string(data))
+		pub, err = wireguard.PublicKeyFromBase64(string(data))
 		if err != nil {
 			// bad key
 			err = core.Wrapf(err, "wg%v.pub", ring)
-			return out, err
+			return nil, err
 		}
 	}
 
-	err = out.Validate()
+	kp := &wireguard.KeyPair{
-	return out, err
+		PrivateKey: key,
+		PublicKey:  pub,
+	}
+
+	if err = kp.Validate(); err != nil {
+		return nil, err
+	}
+
+	return kp, nil
 }
 
 func (m *Machine) tryReadWireguardKeys(ring int) error {
@@ -73,60 +81,6 @@ func (m *Machine) tryReadWireguardKeys(ring int) error {
 	}
 }
 
-// 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)
@@ -178,9 +132,9 @@ func (m *Machine) applyWireguardConfig(ring int, wg *wireguard.Config) error {
 }
 
 func (m *Machine) getRingInfo(ring int) (*RingInfo, bool) {
-	for _, ri := range m.Rings {
+	for _, ri := range m.RingAddresses {
 		if ri.Ring == ring {
-			return ri, ri.Enabled
+			return ri, true
 		}
 	}
 
@@ -188,10 +142,10 @@ func (m *Machine) getRingInfo(ring int) (*RingInfo, bool) {
 }
 
 func (m *Machine) applyRingInfo(ring int, new *RingInfo) error {
-	cur, _ := m.getRingInfo(ring)
+	cur, found := m.getRingInfo(ring)
-	if cur == nil {
+	if !found {
 		// first, append
-		m.Rings = append(m.Rings, new)
+		m.RingAddresses = append(m.RingAddresses, new)
 		return nil
 	}
 
@@ -203,7 +157,8 @@ func (m *Machine) applyWireguardInterfaceConfig(ring int, data wireguard.Interfa
 	ri := &RingInfo{
 		Ring:    ring,
 		Enabled: true,
-		Keys: wireguard.KeyPair{
+		Address: data.Address,
+		Keys: &wireguard.KeyPair{
 			PrivateKey: data.PrivateKey,
 		},
 	}
@@ -223,7 +178,7 @@ 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,
 			},
 		}
@@ -240,8 +195,8 @@ 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:
+	case m.ID() != nodeID:
-		return fmt.Errorf("invalid %s: %v ≠ %v", "zoneID", 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:
@@ -250,14 +205,3 @@ 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

@@ -3,7 +3,6 @@ package zones
 import (
 	"context"
 	"net/netip"
-	"strconv"
 	"time"
 )
 
@@ -27,10 +26,6 @@ func (m *Machine) updatePublicAddresses() error {
 }
 
 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
@@ -39,19 +34,6 @@ func (m *Machine) init() error {
 	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

@@ -14,31 +14,29 @@ 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"`
+	Ring    int                `toml:"ring"`
-	Enabled bool              `toml:"enabled,omitempty"`
+	Enabled bool               `toml:"enabled,omitempty"`
-	Keys    wireguard.KeyPair `toml:"keys,omitempty"`
+	Keys    *wireguard.KeyPair `toml:"keys,omitempty"`
+	Address netip.Addr         `toml:"address,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:
 		// can't disable via Merge
 		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 !canMergeKeyPairs(ri.Keys, alter.Keys):
 		// incompatible keypairs
 		return fmt.Errorf("invalid %s: %s ≠ %s", "keys", ri.Keys, alter.Keys)
@@ -53,19 +51,47 @@ func (ri *RingInfo) unsafeMerge(alter *RingInfo) error {
 		ri.Enabled = true
 	}
 
-	// fill the gaps on our keypair
+	switch {
-	if ri.Keys.PrivateKey.IsZero() {
+	case ri.Keys == nil:
-		ri.Keys.PrivateKey = alter.Keys.PrivateKey
+		// 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
+		}
 	}
-	if ri.Keys.PublicKey.IsZero() {
+
-		ri.Keys.PublicKey = alter.Keys.PublicKey
+	if addressEqual(ri.Address, netip.Addr{}) {
+		// assign address
+		ri.Address = alter.Address
 	}
 
 	return nil
 }
 
-func canMergeKeyPairs(p1, p2 wireguard.KeyPair) bool {
+func canMergeAddress(ip1, ip2 netip.Addr) bool {
+	var zero netip.Addr
+
 	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):
@@ -79,7 +105,6 @@ 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)
 }
@@ -88,14 +113,12 @@ 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
+			id1 := z.Machines[i].ID()
-			id2 := z.Machines[j].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.Rings, func(i, j int) bool {
+		sort.SliceStable(p.RingAddresses, func(i, j int) bool {
-			ri1 := p.Rings[i]
+			ri1 := p.RingAddresses[i]
-			ri2 := p.Rings[j]
+			ri2 := p.RingAddresses[j]
 
 			return ri1.Ring < ri2.Ring
 		})