Add macOS support for MAC and hostname rule items

experimental/libbox/neighbor.go

@@ -1,23 +1,13 @@
-//go:build linux
-
 package libbox
 
 import (
 	"net"
 	"net/netip"
-	"slices"
-	"time"
-
-	"github.com/sagernet/sing-box/route"
-	E "github.com/sagernet/sing/common/exceptions"
-
-	"github.com/mdlayher/netlink"
-	"golang.org/x/sys/unix"
 )
 
 type NeighborEntry struct {
 	Address    string
-	MACAddress string
+	MacAddress string
 	Hostname   string
 }
 
@@ -30,88 +20,16 @@ type NeighborSubscription struct {
 	done chan struct{}
 }
 
-func SubscribeNeighborTable(listener NeighborUpdateListener) (*NeighborSubscription, error) {
-	entries, err := route.ReadNeighborEntries()
-	if err != nil {
-		return nil, E.Cause(err, "initial neighbor dump")
-	}
-	table := make(map[netip.Addr]net.HardwareAddr)
-	for _, entry := range entries {
-		table[entry.Address] = entry.MACAddress
-	}
-	listener.UpdateNeighborTable(tableToIterator(table))
-	connection, err := netlink.Dial(unix.NETLINK_ROUTE, &netlink.Config{
-		Groups: 1 << (unix.RTNLGRP_NEIGH - 1),
-	})
-	if err != nil {
-		return nil, E.Cause(err, "subscribe neighbor updates")
-	}
-	subscription := &NeighborSubscription{
-		done: make(chan struct{}),
-	}
-	go subscription.loop(listener, connection, table)
-	return subscription, nil
-}
-
 func (s *NeighborSubscription) Close() {
 	close(s.done)
 }
 
-func (s *NeighborSubscription) loop(listener NeighborUpdateListener, connection *netlink.Conn, table map[netip.Addr]net.HardwareAddr) {
-	defer connection.Close()
-	for {
-		select {
-		case <-s.done:
-			return
-		default:
-		}
-		err := connection.SetReadDeadline(time.Now().Add(3 * time.Second))
-		if err != nil {
-			return
-		}
-		messages, err := connection.Receive()
-		if err != nil {
-			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
-				continue
-			}
-			select {
-			case <-s.done:
-				return
-			default:
-			}
-			continue
-		}
-		changed := false
-		for _, message := range messages {
-			address, mac, isDelete, ok := route.ParseNeighborMessage(message)
-			if !ok {
-				continue
-			}
-			if isDelete {
-				if _, exists := table[address]; exists {
-					delete(table, address)
-					changed = true
-				}
-			} else {
-				existing, exists := table[address]
-				if !exists || !slices.Equal(existing, mac) {
-					table[address] = mac
-					changed = true
-				}
-			}
-		}
-		if changed {
-			listener.UpdateNeighborTable(tableToIterator(table))
-		}
-	}
-}
-
 func tableToIterator(table map[netip.Addr]net.HardwareAddr) NeighborEntryIterator {
 	entries := make([]*NeighborEntry, 0, len(table))
 	for address, mac := range table {
 		entries = append(entries, &NeighborEntry{
 			Address:    address.String(),
-			MACAddress: mac.String(),
+			MacAddress: mac.String(),
 		})
 	}
 	return &neighborEntryIterator{entries}

experimental/libbox/neighbor_darwin.go

@@ -0,0 +1,123 @@
+//go:build darwin
+
+package libbox
+
+import (
+	"net"
+	"net/netip"
+	"os"
+	"slices"
+	"time"
+
+	"github.com/sagernet/sing-box/route"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	xroute "golang.org/x/net/route"
+	"golang.org/x/sys/unix"
+)
+
+func SubscribeNeighborTable(listener NeighborUpdateListener) (*NeighborSubscription, error) {
+	entries, err := route.ReadNeighborEntries()
+	if err != nil {
+		return nil, E.Cause(err, "initial neighbor dump")
+	}
+	table := make(map[netip.Addr]net.HardwareAddr)
+	for _, entry := range entries {
+		table[entry.Address] = entry.MACAddress
+	}
+	listener.UpdateNeighborTable(tableToIterator(table))
+	routeSocket, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		return nil, E.Cause(err, "open route socket")
+	}
+	err = unix.SetNonblock(routeSocket, true)
+	if err != nil {
+		unix.Close(routeSocket)
+		return nil, E.Cause(err, "set route socket nonblock")
+	}
+	subscription := &NeighborSubscription{
+		done: make(chan struct{}),
+	}
+	go subscription.loop(listener, routeSocket, table)
+	return subscription, nil
+}
+
+func (s *NeighborSubscription) loop(listener NeighborUpdateListener, routeSocket int, table map[netip.Addr]net.HardwareAddr) {
+	routeSocketFile := os.NewFile(uintptr(routeSocket), "route")
+	defer routeSocketFile.Close()
+	buffer := buf.NewPacket()
+	defer buffer.Release()
+	for {
+		select {
+		case <-s.done:
+			return
+		default:
+		}
+		tv := unix.NsecToTimeval(int64(3 * time.Second))
+		_ = unix.SetsockoptTimeval(routeSocket, unix.SOL_SOCKET, unix.SO_RCVTIMEO, &tv)
+		n, err := routeSocketFile.Read(buffer.FreeBytes())
+		if err != nil {
+			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+				continue
+			}
+			select {
+			case <-s.done:
+				return
+			default:
+			}
+			continue
+		}
+		messages, err := xroute.ParseRIB(xroute.RIBTypeRoute, buffer.FreeBytes()[:n])
+		if err != nil {
+			continue
+		}
+		changed := false
+		for _, message := range messages {
+			routeMessage, isRouteMessage := message.(*xroute.RouteMessage)
+			if !isRouteMessage {
+				continue
+			}
+			if routeMessage.Flags&unix.RTF_LLINFO == 0 {
+				continue
+			}
+			address, mac, isDelete, ok := route.ParseRouteNeighborMessage(routeMessage)
+			if !ok {
+				continue
+			}
+			if isDelete {
+				if _, exists := table[address]; exists {
+					delete(table, address)
+					changed = true
+				}
+			} else {
+				existing, exists := table[address]
+				if !exists || !slices.Equal(existing, mac) {
+					table[address] = mac
+					changed = true
+				}
+			}
+		}
+		if changed {
+			listener.UpdateNeighborTable(tableToIterator(table))
+		}
+	}
+}
+
+func ReadBootpdLeases() NeighborEntryIterator {
+	leaseIPToMAC, ipToHostname, macToHostname := route.ReloadLeaseFiles([]string{"/var/db/dhcpd_leases"})
+	entries := make([]*NeighborEntry, 0, len(leaseIPToMAC))
+	for address, mac := range leaseIPToMAC {
+		entry := &NeighborEntry{
+			Address:    address.String(),
+			MacAddress: mac.String(),
+		}
+		hostname, found := ipToHostname[address]
+		if !found {
+			hostname = macToHostname[mac.String()]
+		}
+		entry.Hostname = hostname
+		entries = append(entries, entry)
+	}
+	return &neighborEntryIterator{entries}
+}

experimental/libbox/neighbor_linux.go

@@ -0,0 +1,88 @@
+//go:build linux
+
+package libbox
+
+import (
+	"net"
+	"net/netip"
+	"slices"
+	"time"
+
+	"github.com/sagernet/sing-box/route"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/mdlayher/netlink"
+	"golang.org/x/sys/unix"
+)
+
+func SubscribeNeighborTable(listener NeighborUpdateListener) (*NeighborSubscription, error) {
+	entries, err := route.ReadNeighborEntries()
+	if err != nil {
+		return nil, E.Cause(err, "initial neighbor dump")
+	}
+	table := make(map[netip.Addr]net.HardwareAddr)
+	for _, entry := range entries {
+		table[entry.Address] = entry.MACAddress
+	}
+	listener.UpdateNeighborTable(tableToIterator(table))
+	connection, err := netlink.Dial(unix.NETLINK_ROUTE, &netlink.Config{
+		Groups: 1 << (unix.RTNLGRP_NEIGH - 1),
+	})
+	if err != nil {
+		return nil, E.Cause(err, "subscribe neighbor updates")
+	}
+	subscription := &NeighborSubscription{
+		done: make(chan struct{}),
+	}
+	go subscription.loop(listener, connection, table)
+	return subscription, nil
+}
+
+func (s *NeighborSubscription) loop(listener NeighborUpdateListener, connection *netlink.Conn, table map[netip.Addr]net.HardwareAddr) {
+	defer connection.Close()
+	for {
+		select {
+		case <-s.done:
+			return
+		default:
+		}
+		err := connection.SetReadDeadline(time.Now().Add(3 * time.Second))
+		if err != nil {
+			return
+		}
+		messages, err := connection.Receive()
+		if err != nil {
+			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+				continue
+			}
+			select {
+			case <-s.done:
+				return
+			default:
+			}
+			continue
+		}
+		changed := false
+		for _, message := range messages {
+			address, mac, isDelete, ok := route.ParseNeighborMessage(message)
+			if !ok {
+				continue
+			}
+			if isDelete {
+				if _, exists := table[address]; exists {
+					delete(table, address)
+					changed = true
+				}
+			} else {
+				existing, exists := table[address]
+				if !exists || !slices.Equal(existing, mac) {
+					table[address] = mac
+					changed = true
+				}
+			}
+		}
+		if changed {
+			listener.UpdateNeighborTable(tableToIterator(table))
+		}
+	}
+}

experimental/libbox/neighbor_stub.go

@@ -1,24 +1,9 @@
-//go:build !linux
+//go:build !linux && !darwin
 
 package libbox
 
 import "os"
 
-type NeighborEntry struct {
-	Address    string
-	MACAddress string
-	Hostname   string
-}
-
-type NeighborEntryIterator interface {
-	Next() *NeighborEntry
-	HasNext() bool
-}
-
-type NeighborSubscription struct{}
-
-func SubscribeNeighborTable(listener NeighborUpdateListener) (*NeighborSubscription, error) {
+func SubscribeNeighborTable(_ NeighborUpdateListener) (*NeighborSubscription, error) {
 	return nil, os.ErrInvalid
 }
-
-func (s *NeighborSubscription) Close() {}

experimental/libbox/platform.go

@@ -23,6 +23,7 @@ type PlatformInterface interface {
 	SendNotification(notification *Notification) error
 	StartNeighborMonitor(listener NeighborUpdateListener) error
 	CloseNeighborMonitor(listener NeighborUpdateListener) error
+	RegisterMyInterface(name string)
 }
 
 type NeighborUpdateListener interface {

experimental/libbox/service.go

@@ -78,6 +78,7 @@ func (w *platformInterfaceWrapper) OpenInterface(options *tun.Options, platformO
 	}
 	options.FileDescriptor = dupFd
 	w.myTunName = options.Name
+	w.iif.RegisterMyInterface(options.Name)
 	return tun.New(*options)
 }
 
@@ -240,11 +241,14 @@ func (w *neighborUpdateListenerWrapper) UpdateNeighborTable(entries NeighborEntr
 	var result []adapter.NeighborEntry
 	for entries.HasNext() {
 		entry := entries.Next()
+		if entry == nil {
+			continue
+		}
 		address, err := netip.ParseAddr(entry.Address)
 		if err != nil {
 			continue
 		}
-		macAddress, err := net.ParseMAC(entry.MACAddress)
+		macAddress, err := net.ParseMAC(entry.MacAddress)
 		if err != nil {
 			continue
 		}

route/neighbor_resolver_darwin.go

@@ -0,0 +1,239 @@
+//go:build darwin
+
+package route
+
+import (
+	"net"
+	"net/netip"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/sagernet/fswatch"
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing/common/buf"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/logger"
+
+	"golang.org/x/net/route"
+	"golang.org/x/sys/unix"
+)
+
+var defaultLeaseFiles = []string{
+	"/var/db/dhcpd_leases",
+	"/tmp/dhcp.leases",
+}
+
+type neighborResolver struct {
+	logger          logger.ContextLogger
+	leaseFiles      []string
+	access          sync.RWMutex
+	neighborIPToMAC map[netip.Addr]net.HardwareAddr
+	leaseIPToMAC    map[netip.Addr]net.HardwareAddr
+	ipToHostname    map[netip.Addr]string
+	macToHostname   map[string]string
+	watcher         *fswatch.Watcher
+	done            chan struct{}
+}
+
+func newNeighborResolver(resolverLogger logger.ContextLogger, leaseFiles []string) (adapter.NeighborResolver, error) {
+	if len(leaseFiles) == 0 {
+		for _, path := range defaultLeaseFiles {
+			info, err := os.Stat(path)
+			if err == nil && info.Size() > 0 {
+				leaseFiles = append(leaseFiles, path)
+			}
+		}
+	}
+	return &neighborResolver{
+		logger:          resolverLogger,
+		leaseFiles:      leaseFiles,
+		neighborIPToMAC: make(map[netip.Addr]net.HardwareAddr),
+		leaseIPToMAC:    make(map[netip.Addr]net.HardwareAddr),
+		ipToHostname:    make(map[netip.Addr]string),
+		macToHostname:   make(map[string]string),
+		done:            make(chan struct{}),
+	}, nil
+}
+
+func (r *neighborResolver) Start() error {
+	err := r.loadNeighborTable()
+	if err != nil {
+		r.logger.Warn(E.Cause(err, "load neighbor table"))
+	}
+	r.doReloadLeaseFiles()
+	go r.subscribeNeighborUpdates()
+	if len(r.leaseFiles) > 0 {
+		watcher, err := fswatch.NewWatcher(fswatch.Options{
+			Path:   r.leaseFiles,
+			Logger: r.logger,
+			Callback: func(_ string) {
+				r.doReloadLeaseFiles()
+			},
+		})
+		if err != nil {
+			r.logger.Warn(E.Cause(err, "create lease file watcher"))
+		} else {
+			r.watcher = watcher
+			err = watcher.Start()
+			if err != nil {
+				r.logger.Warn(E.Cause(err, "start lease file watcher"))
+			}
+		}
+	}
+	return nil
+}
+
+func (r *neighborResolver) Close() error {
+	close(r.done)
+	if r.watcher != nil {
+		return r.watcher.Close()
+	}
+	return nil
+}
+
+func (r *neighborResolver) LookupMAC(address netip.Addr) (net.HardwareAddr, bool) {
+	r.access.RLock()
+	defer r.access.RUnlock()
+	mac, found := r.neighborIPToMAC[address]
+	if found {
+		return mac, true
+	}
+	mac, found = r.leaseIPToMAC[address]
+	if found {
+		return mac, true
+	}
+	mac, found = extractMACFromEUI64(address)
+	if found {
+		return mac, true
+	}
+	return nil, false
+}
+
+func (r *neighborResolver) LookupHostname(address netip.Addr) (string, bool) {
+	r.access.RLock()
+	defer r.access.RUnlock()
+	hostname, found := r.ipToHostname[address]
+	if found {
+		return hostname, true
+	}
+	mac, macFound := r.neighborIPToMAC[address]
+	if !macFound {
+		mac, macFound = r.leaseIPToMAC[address]
+	}
+	if !macFound {
+		mac, macFound = extractMACFromEUI64(address)
+	}
+	if macFound {
+		hostname, found = r.macToHostname[mac.String()]
+		if found {
+			return hostname, true
+		}
+	}
+	return "", false
+}
+
+func (r *neighborResolver) loadNeighborTable() error {
+	entries, err := ReadNeighborEntries()
+	if err != nil {
+		return err
+	}
+	r.access.Lock()
+	defer r.access.Unlock()
+	for _, entry := range entries {
+		r.neighborIPToMAC[entry.Address] = entry.MACAddress
+	}
+	return nil
+}
+
+func (r *neighborResolver) subscribeNeighborUpdates() {
+	routeSocket, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		r.logger.Warn(E.Cause(err, "subscribe neighbor updates"))
+		return
+	}
+	err = unix.SetNonblock(routeSocket, true)
+	if err != nil {
+		unix.Close(routeSocket)
+		r.logger.Warn(E.Cause(err, "set route socket nonblock"))
+		return
+	}
+	routeSocketFile := os.NewFile(uintptr(routeSocket), "route")
+	defer routeSocketFile.Close()
+	buffer := buf.NewPacket()
+	defer buffer.Release()
+	for {
+		select {
+		case <-r.done:
+			return
+		default:
+		}
+		err = setReadDeadline(routeSocketFile, 3*time.Second)
+		if err != nil {
+			r.logger.Warn(E.Cause(err, "set route socket read deadline"))
+			return
+		}
+		n, err := routeSocketFile.Read(buffer.FreeBytes())
+		if err != nil {
+			if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
+				continue
+			}
+			select {
+			case <-r.done:
+				return
+			default:
+			}
+			r.logger.Warn(E.Cause(err, "receive neighbor update"))
+			continue
+		}
+		messages, err := route.ParseRIB(route.RIBTypeRoute, buffer.FreeBytes()[:n])
+		if err != nil {
+			continue
+		}
+		for _, message := range messages {
+			routeMessage, isRouteMessage := message.(*route.RouteMessage)
+			if !isRouteMessage {
+				continue
+			}
+			if routeMessage.Flags&unix.RTF_LLINFO == 0 {
+				continue
+			}
+			address, mac, isDelete, ok := ParseRouteNeighborMessage(routeMessage)
+			if !ok {
+				continue
+			}
+			r.access.Lock()
+			if isDelete {
+				delete(r.neighborIPToMAC, address)
+			} else {
+				r.neighborIPToMAC[address] = mac
+			}
+			r.access.Unlock()
+		}
+	}
+}
+
+func (r *neighborResolver) doReloadLeaseFiles() {
+	leaseIPToMAC, ipToHostname, macToHostname := ReloadLeaseFiles(r.leaseFiles)
+	r.access.Lock()
+	r.leaseIPToMAC = leaseIPToMAC
+	r.ipToHostname = ipToHostname
+	r.macToHostname = macToHostname
+	r.access.Unlock()
+}
+
+func setReadDeadline(file *os.File, timeout time.Duration) error {
+	rawConn, err := file.SyscallConn()
+	if err != nil {
+		return err
+	}
+	var controlErr error
+	err = rawConn.Control(func(fd uintptr) {
+		tv := unix.NsecToTimeval(int64(timeout))
+		controlErr = unix.SetsockoptTimeval(int(fd), unix.SOL_SOCKET, unix.SO_RCVTIMEO, &tv)
+	})
+	if err != nil {
+		return err
+	}
+	return controlErr
+}

route/neighbor_resolver_lease.go

@@ -0,0 +1,386 @@
+package route
+
+import (
+	"bufio"
+	"encoding/hex"
+	"net"
+	"net/netip"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func parseLeaseFile(path string, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	file, err := os.Open(path)
+	if err != nil {
+		return
+	}
+	defer file.Close()
+	if strings.HasSuffix(path, "dhcpd_leases") {
+		parseBootpdLeases(file, ipToMAC, ipToHostname, macToHostname)
+		return
+	}
+	if strings.HasSuffix(path, "kea-leases4.csv") {
+		parseKeaCSV4(file, ipToMAC, ipToHostname, macToHostname)
+		return
+	}
+	if strings.HasSuffix(path, "kea-leases6.csv") {
+		parseKeaCSV6(file, ipToMAC, ipToHostname, macToHostname)
+		return
+	}
+	if strings.HasSuffix(path, "dhcpd.leases") {
+		parseISCDhcpd(file, ipToMAC, ipToHostname, macToHostname)
+		return
+	}
+	parseDnsmasqOdhcpd(file, ipToMAC, ipToHostname, macToHostname)
+}
+
+func ReloadLeaseFiles(leaseFiles []string) (leaseIPToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	leaseIPToMAC = make(map[netip.Addr]net.HardwareAddr)
+	ipToHostname = make(map[netip.Addr]string)
+	macToHostname = make(map[string]string)
+	for _, path := range leaseFiles {
+		parseLeaseFile(path, leaseIPToMAC, ipToHostname, macToHostname)
+	}
+	return
+}
+
+func parseDnsmasqOdhcpd(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	now := time.Now().Unix()
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		line := scanner.Text()
+		if strings.HasPrefix(line, "duid ") {
+			continue
+		}
+		if strings.HasPrefix(line, "# ") {
+			parseOdhcpdLine(line[2:], ipToMAC, ipToHostname, macToHostname)
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 4 {
+			continue
+		}
+		expiry, err := strconv.ParseInt(fields[0], 10, 64)
+		if err != nil {
+			continue
+		}
+		if expiry != 0 && expiry < now {
+			continue
+		}
+		if strings.Contains(fields[1], ":") {
+			mac, macErr := net.ParseMAC(fields[1])
+			if macErr != nil {
+				continue
+			}
+			address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[2]))
+			if !addrOK {
+				continue
+			}
+			address = address.Unmap()
+			ipToMAC[address] = mac
+			hostname := fields[3]
+			if hostname != "*" {
+				ipToHostname[address] = hostname
+				macToHostname[mac.String()] = hostname
+			}
+		} else {
+			var mac net.HardwareAddr
+			if len(fields) >= 5 {
+				duid, duidErr := parseDUID(fields[4])
+				if duidErr == nil {
+					mac, _ = extractMACFromDUID(duid)
+				}
+			}
+			address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[2]))
+			if !addrOK {
+				continue
+			}
+			address = address.Unmap()
+			if mac != nil {
+				ipToMAC[address] = mac
+			}
+			hostname := fields[3]
+			if hostname != "*" {
+				ipToHostname[address] = hostname
+				if mac != nil {
+					macToHostname[mac.String()] = hostname
+				}
+			}
+		}
+	}
+}
+
+func parseOdhcpdLine(line string, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	fields := strings.Fields(line)
+	if len(fields) < 5 {
+		return
+	}
+	validTime, err := strconv.ParseInt(fields[4], 10, 64)
+	if err != nil {
+		return
+	}
+	if validTime == 0 {
+		return
+	}
+	if validTime > 0 && validTime < time.Now().Unix() {
+		return
+	}
+	hostname := fields[3]
+	if hostname == "-" || strings.HasPrefix(hostname, `broken\x20`) {
+		hostname = ""
+	}
+	if len(fields) >= 8 && fields[2] == "ipv4" {
+		mac, macErr := net.ParseMAC(fields[1])
+		if macErr != nil {
+			return
+		}
+		addressField := fields[7]
+		slashIndex := strings.IndexByte(addressField, '/')
+		if slashIndex >= 0 {
+			addressField = addressField[:slashIndex]
+		}
+		address, addrOK := netip.AddrFromSlice(net.ParseIP(addressField))
+		if !addrOK {
+			return
+		}
+		address = address.Unmap()
+		ipToMAC[address] = mac
+		if hostname != "" {
+			ipToHostname[address] = hostname
+			macToHostname[mac.String()] = hostname
+		}
+		return
+	}
+	var mac net.HardwareAddr
+	duidHex := fields[1]
+	duidBytes, hexErr := hex.DecodeString(duidHex)
+	if hexErr == nil {
+		mac, _ = extractMACFromDUID(duidBytes)
+	}
+	for i := 7; i < len(fields); i++ {
+		addressField := fields[i]
+		slashIndex := strings.IndexByte(addressField, '/')
+		if slashIndex >= 0 {
+			addressField = addressField[:slashIndex]
+		}
+		address, addrOK := netip.AddrFromSlice(net.ParseIP(addressField))
+		if !addrOK {
+			continue
+		}
+		address = address.Unmap()
+		if mac != nil {
+			ipToMAC[address] = mac
+		}
+		if hostname != "" {
+			ipToHostname[address] = hostname
+			if mac != nil {
+				macToHostname[mac.String()] = hostname
+			}
+		}
+	}
+}
+
+func parseISCDhcpd(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	scanner := bufio.NewScanner(file)
+	var currentIP netip.Addr
+	var currentMAC net.HardwareAddr
+	var currentHostname string
+	var currentActive bool
+	var inLease bool
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if strings.HasPrefix(line, "lease ") && strings.HasSuffix(line, "{") {
+			ipString := strings.TrimSuffix(strings.TrimPrefix(line, "lease "), " {")
+			parsed, addrOK := netip.AddrFromSlice(net.ParseIP(ipString))
+			if addrOK {
+				currentIP = parsed.Unmap()
+				inLease = true
+				currentMAC = nil
+				currentHostname = ""
+				currentActive = false
+			}
+			continue
+		}
+		if line == "}" && inLease {
+			if currentActive && currentMAC != nil {
+				ipToMAC[currentIP] = currentMAC
+				if currentHostname != "" {
+					ipToHostname[currentIP] = currentHostname
+					macToHostname[currentMAC.String()] = currentHostname
+				}
+			} else {
+				delete(ipToMAC, currentIP)
+				delete(ipToHostname, currentIP)
+			}
+			inLease = false
+			continue
+		}
+		if !inLease {
+			continue
+		}
+		if strings.HasPrefix(line, "hardware ethernet ") {
+			macString := strings.TrimSuffix(strings.TrimPrefix(line, "hardware ethernet "), ";")
+			parsed, macErr := net.ParseMAC(macString)
+			if macErr == nil {
+				currentMAC = parsed
+			}
+		} else if strings.HasPrefix(line, "client-hostname ") {
+			hostname := strings.TrimSuffix(strings.TrimPrefix(line, "client-hostname "), ";")
+			hostname = strings.Trim(hostname, "\"")
+			if hostname != "" {
+				currentHostname = hostname
+			}
+		} else if strings.HasPrefix(line, "binding state ") {
+			state := strings.TrimSuffix(strings.TrimPrefix(line, "binding state "), ";")
+			currentActive = state == "active"
+		}
+	}
+}
+
+func parseKeaCSV4(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	scanner := bufio.NewScanner(file)
+	firstLine := true
+	for scanner.Scan() {
+		if firstLine {
+			firstLine = false
+			continue
+		}
+		fields := strings.Split(scanner.Text(), ",")
+		if len(fields) < 10 {
+			continue
+		}
+		if fields[9] != "0" {
+			continue
+		}
+		address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[0]))
+		if !addrOK {
+			continue
+		}
+		address = address.Unmap()
+		mac, macErr := net.ParseMAC(fields[1])
+		if macErr != nil {
+			continue
+		}
+		ipToMAC[address] = mac
+		hostname := ""
+		if len(fields) > 8 {
+			hostname = fields[8]
+		}
+		if hostname != "" {
+			ipToHostname[address] = hostname
+			macToHostname[mac.String()] = hostname
+		}
+	}
+}
+
+func parseKeaCSV6(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	scanner := bufio.NewScanner(file)
+	firstLine := true
+	for scanner.Scan() {
+		if firstLine {
+			firstLine = false
+			continue
+		}
+		fields := strings.Split(scanner.Text(), ",")
+		if len(fields) < 14 {
+			continue
+		}
+		if fields[13] != "0" {
+			continue
+		}
+		address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[0]))
+		if !addrOK {
+			continue
+		}
+		address = address.Unmap()
+		var mac net.HardwareAddr
+		if fields[12] != "" {
+			mac, _ = net.ParseMAC(fields[12])
+		}
+		if mac == nil {
+			duid, duidErr := hex.DecodeString(strings.ReplaceAll(fields[1], ":", ""))
+			if duidErr == nil {
+				mac, _ = extractMACFromDUID(duid)
+			}
+		}
+		hostname := ""
+		if len(fields) > 11 {
+			hostname = fields[11]
+		}
+		if mac != nil {
+			ipToMAC[address] = mac
+		}
+		if hostname != "" {
+			ipToHostname[address] = hostname
+			if mac != nil {
+				macToHostname[mac.String()] = hostname
+			}
+		}
+	}
+}
+
+func parseBootpdLeases(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
+	now := time.Now().Unix()
+	scanner := bufio.NewScanner(file)
+	var currentName string
+	var currentIP netip.Addr
+	var currentMAC net.HardwareAddr
+	var currentLease int64
+	var inBlock bool
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		if line == "{" {
+			inBlock = true
+			currentName = ""
+			currentIP = netip.Addr{}
+			currentMAC = nil
+			currentLease = 0
+			continue
+		}
+		if line == "}" && inBlock {
+			if currentMAC != nil && currentIP.IsValid() {
+				if currentLease == 0 || currentLease >= now {
+					ipToMAC[currentIP] = currentMAC
+					if currentName != "" {
+						ipToHostname[currentIP] = currentName
+						macToHostname[currentMAC.String()] = currentName
+					}
+				}
+			}
+			inBlock = false
+			continue
+		}
+		if !inBlock {
+			continue
+		}
+		key, value, found := strings.Cut(line, "=")
+		if !found {
+			continue
+		}
+		switch key {
+		case "name":
+			currentName = value
+		case "ip_address":
+			parsed, addrOK := netip.AddrFromSlice(net.ParseIP(value))
+			if addrOK {
+				currentIP = parsed.Unmap()
+			}
+		case "hw_address":
+			typeAndMAC, hasSep := strings.CutPrefix(value, "1,")
+			if hasSep {
+				mac, macErr := net.ParseMAC(typeAndMAC)
+				if macErr == nil {
+					currentMAC = mac
+				}
+			}
+		case "lease":
+			leaseHex := strings.TrimPrefix(value, "0x")
+			parsed, parseErr := strconv.ParseInt(leaseHex, 16, 64)
+			if parseErr == nil {
+				currentLease = parsed
+			}
+		}
+	}
+}

route/neighbor_resolver_linux.go

@@ -3,14 +3,10 @@
 package route
 
 import (
-	"bufio"
-	"encoding/hex"
 	"net"
 	"net/netip"
 	"os"
 	"slices"
-	"strconv"
-	"strings"
 	"sync"
 	"time"
 
@@ -69,14 +65,14 @@ func (r *neighborResolver) Start() error {
 	if err != nil {
 		r.logger.Warn(E.Cause(err, "load neighbor table"))
 	}
-	r.reloadLeaseFiles()
+	r.doReloadLeaseFiles()
 	go r.subscribeNeighborUpdates()
 	if len(r.leaseFiles) > 0 {
 		watcher, err := fswatch.NewWatcher(fswatch.Options{
 			Path:   r.leaseFiles,
 			Logger: r.logger,
 			Callback: func(_ string) {
-				r.reloadLeaseFiles()
+				r.doReloadLeaseFiles()
 			},
 		})
 		if err != nil {
@@ -218,312 +214,11 @@ func (r *neighborResolver) subscribeNeighborUpdates() {
 	}
 }
 
-func (r *neighborResolver) reloadLeaseFiles() {
-	leaseIPToMAC := make(map[netip.Addr]net.HardwareAddr)
-	ipToHostname := make(map[netip.Addr]string)
-	macToHostname := make(map[string]string)
-	for _, path := range r.leaseFiles {
-		r.parseLeaseFile(path, leaseIPToMAC, ipToHostname, macToHostname)
-	}
+func (r *neighborResolver) doReloadLeaseFiles() {
+	leaseIPToMAC, ipToHostname, macToHostname := ReloadLeaseFiles(r.leaseFiles)
 	r.access.Lock()
 	r.leaseIPToMAC = leaseIPToMAC
 	r.ipToHostname = ipToHostname
 	r.macToHostname = macToHostname
 	r.access.Unlock()
 }
-
-func (r *neighborResolver) parseLeaseFile(path string, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	file, err := os.Open(path)
-	if err != nil {
-		return
-	}
-	defer file.Close()
-	if strings.HasSuffix(path, "kea-leases4.csv") {
-		r.parseKeaCSV4(file, ipToMAC, ipToHostname, macToHostname)
-		return
-	}
-	if strings.HasSuffix(path, "kea-leases6.csv") {
-		r.parseKeaCSV6(file, ipToMAC, ipToHostname, macToHostname)
-		return
-	}
-	if strings.HasSuffix(path, "dhcpd.leases") {
-		r.parseISCDhcpd(file, ipToMAC, ipToHostname, macToHostname)
-		return
-	}
-	r.parseDnsmasqOdhcpd(file, ipToMAC, ipToHostname, macToHostname)
-}
-
-func (r *neighborResolver) parseDnsmasqOdhcpd(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	now := time.Now().Unix()
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		line := scanner.Text()
-		if strings.HasPrefix(line, "duid ") {
-			continue
-		}
-		if strings.HasPrefix(line, "# ") {
-			r.parseOdhcpdLine(line[2:], ipToMAC, ipToHostname, macToHostname)
-			continue
-		}
-		fields := strings.Fields(line)
-		if len(fields) < 4 {
-			continue
-		}
-		expiry, err := strconv.ParseInt(fields[0], 10, 64)
-		if err != nil {
-			continue
-		}
-		if expiry != 0 && expiry < now {
-			continue
-		}
-		if strings.Contains(fields[1], ":") {
-			mac, macErr := net.ParseMAC(fields[1])
-			if macErr != nil {
-				continue
-			}
-			address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[2]))
-			if !addrOK {
-				continue
-			}
-			address = address.Unmap()
-			ipToMAC[address] = mac
-			hostname := fields[3]
-			if hostname != "*" {
-				ipToHostname[address] = hostname
-				macToHostname[mac.String()] = hostname
-			}
-		} else {
-			var mac net.HardwareAddr
-			if len(fields) >= 5 {
-				duid, duidErr := parseDUID(fields[4])
-				if duidErr == nil {
-					mac, _ = extractMACFromDUID(duid)
-				}
-			}
-			address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[2]))
-			if !addrOK {
-				continue
-			}
-			address = address.Unmap()
-			if mac != nil {
-				ipToMAC[address] = mac
-			}
-			hostname := fields[3]
-			if hostname != "*" {
-				ipToHostname[address] = hostname
-				if mac != nil {
-					macToHostname[mac.String()] = hostname
-				}
-			}
-		}
-	}
-}
-
-func (r *neighborResolver) parseOdhcpdLine(line string, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	fields := strings.Fields(line)
-	if len(fields) < 5 {
-		return
-	}
-	validTime, err := strconv.ParseInt(fields[4], 10, 64)
-	if err != nil {
-		return
-	}
-	if validTime == 0 {
-		return
-	}
-	if validTime > 0 && validTime < time.Now().Unix() {
-		return
-	}
-	hostname := fields[3]
-	if hostname == "-" || strings.HasPrefix(hostname, `broken\x20`) {
-		hostname = ""
-	}
-	if len(fields) >= 8 && fields[2] == "ipv4" {
-		mac, macErr := net.ParseMAC(fields[1])
-		if macErr != nil {
-			return
-		}
-		addressField := fields[7]
-		slashIndex := strings.IndexByte(addressField, '/')
-		if slashIndex >= 0 {
-			addressField = addressField[:slashIndex]
-		}
-		address, addrOK := netip.AddrFromSlice(net.ParseIP(addressField))
-		if !addrOK {
-			return
-		}
-		address = address.Unmap()
-		ipToMAC[address] = mac
-		if hostname != "" {
-			ipToHostname[address] = hostname
-			macToHostname[mac.String()] = hostname
-		}
-		return
-	}
-	var mac net.HardwareAddr
-	duidHex := fields[1]
-	duidBytes, hexErr := hex.DecodeString(duidHex)
-	if hexErr == nil {
-		mac, _ = extractMACFromDUID(duidBytes)
-	}
-	for i := 7; i < len(fields); i++ {
-		addressField := fields[i]
-		slashIndex := strings.IndexByte(addressField, '/')
-		if slashIndex >= 0 {
-			addressField = addressField[:slashIndex]
-		}
-		address, addrOK := netip.AddrFromSlice(net.ParseIP(addressField))
-		if !addrOK {
-			continue
-		}
-		address = address.Unmap()
-		if mac != nil {
-			ipToMAC[address] = mac
-		}
-		if hostname != "" {
-			ipToHostname[address] = hostname
-			if mac != nil {
-				macToHostname[mac.String()] = hostname
-			}
-		}
-	}
-}
-
-func (r *neighborResolver) parseISCDhcpd(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	scanner := bufio.NewScanner(file)
-	var currentIP netip.Addr
-	var currentMAC net.HardwareAddr
-	var currentHostname string
-	var currentActive bool
-	var inLease bool
-	for scanner.Scan() {
-		line := strings.TrimSpace(scanner.Text())
-		if strings.HasPrefix(line, "lease ") && strings.HasSuffix(line, "{") {
-			ipString := strings.TrimSuffix(strings.TrimPrefix(line, "lease "), " {")
-			parsed, addrOK := netip.AddrFromSlice(net.ParseIP(ipString))
-			if addrOK {
-				currentIP = parsed.Unmap()
-				inLease = true
-				currentMAC = nil
-				currentHostname = ""
-				currentActive = false
-			}
-			continue
-		}
-		if line == "}" && inLease {
-			if currentActive && currentMAC != nil {
-				ipToMAC[currentIP] = currentMAC
-				if currentHostname != "" {
-					ipToHostname[currentIP] = currentHostname
-					macToHostname[currentMAC.String()] = currentHostname
-				}
-			} else {
-				delete(ipToMAC, currentIP)
-				delete(ipToHostname, currentIP)
-			}
-			inLease = false
-			continue
-		}
-		if !inLease {
-			continue
-		}
-		if strings.HasPrefix(line, "hardware ethernet ") {
-			macString := strings.TrimSuffix(strings.TrimPrefix(line, "hardware ethernet "), ";")
-			parsed, macErr := net.ParseMAC(macString)
-			if macErr == nil {
-				currentMAC = parsed
-			}
-		} else if strings.HasPrefix(line, "client-hostname ") {
-			hostname := strings.TrimSuffix(strings.TrimPrefix(line, "client-hostname "), ";")
-			hostname = strings.Trim(hostname, "\"")
-			if hostname != "" {
-				currentHostname = hostname
-			}
-		} else if strings.HasPrefix(line, "binding state ") {
-			state := strings.TrimSuffix(strings.TrimPrefix(line, "binding state "), ";")
-			currentActive = state == "active"
-		}
-	}
-}
-
-func (r *neighborResolver) parseKeaCSV4(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	scanner := bufio.NewScanner(file)
-	firstLine := true
-	for scanner.Scan() {
-		if firstLine {
-			firstLine = false
-			continue
-		}
-		fields := strings.Split(scanner.Text(), ",")
-		if len(fields) < 10 {
-			continue
-		}
-		if fields[9] != "0" {
-			continue
-		}
-		address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[0]))
-		if !addrOK {
-			continue
-		}
-		address = address.Unmap()
-		mac, macErr := net.ParseMAC(fields[1])
-		if macErr != nil {
-			continue
-		}
-		ipToMAC[address] = mac
-		hostname := ""
-		if len(fields) > 8 {
-			hostname = fields[8]
-		}
-		if hostname != "" {
-			ipToHostname[address] = hostname
-			macToHostname[mac.String()] = hostname
-		}
-	}
-}
-
-func (r *neighborResolver) parseKeaCSV6(file *os.File, ipToMAC map[netip.Addr]net.HardwareAddr, ipToHostname map[netip.Addr]string, macToHostname map[string]string) {
-	scanner := bufio.NewScanner(file)
-	firstLine := true
-	for scanner.Scan() {
-		if firstLine {
-			firstLine = false
-			continue
-		}
-		fields := strings.Split(scanner.Text(), ",")
-		if len(fields) < 14 {
-			continue
-		}
-		if fields[13] != "0" {
-			continue
-		}
-		address, addrOK := netip.AddrFromSlice(net.ParseIP(fields[0]))
-		if !addrOK {
-			continue
-		}
-		address = address.Unmap()
-		var mac net.HardwareAddr
-		if fields[12] != "" {
-			mac, _ = net.ParseMAC(fields[12])
-		}
-		if mac == nil {
-			duid, duidErr := hex.DecodeString(strings.ReplaceAll(fields[1], ":", ""))
-			if duidErr == nil {
-				mac, _ = extractMACFromDUID(duid)
-			}
-		}
-		hostname := ""
-		if len(fields) > 11 {
-			hostname = fields[11]
-		}
-		if mac != nil {
-			ipToMAC[address] = mac
-		}
-		if hostname != "" {
-			ipToHostname[address] = hostname
-			if mac != nil {
-				macToHostname[mac.String()] = hostname
-			}
-		}
-	}
-}

route/neighbor_resolver_stub.go

@@ -1,4 +1,4 @@
-//go:build !linux
+//go:build !linux && !darwin
 
 package route
 

route/neighbor_table_darwin.go

@@ -0,0 +1,104 @@
+//go:build darwin
+
+package route
+
+import (
+	"net"
+	"net/netip"
+	"syscall"
+
+	"github.com/sagernet/sing-box/adapter"
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"golang.org/x/net/route"
+	"golang.org/x/sys/unix"
+)
+
+func ReadNeighborEntries() ([]adapter.NeighborEntry, error) {
+	var entries []adapter.NeighborEntry
+	ipv4Entries, err := readNeighborEntriesAF(syscall.AF_INET)
+	if err != nil {
+		return nil, E.Cause(err, "read IPv4 neighbors")
+	}
+	entries = append(entries, ipv4Entries...)
+	ipv6Entries, err := readNeighborEntriesAF(syscall.AF_INET6)
+	if err != nil {
+		return nil, E.Cause(err, "read IPv6 neighbors")
+	}
+	entries = append(entries, ipv6Entries...)
+	return entries, nil
+}
+
+func readNeighborEntriesAF(addressFamily int) ([]adapter.NeighborEntry, error) {
+	rib, err := route.FetchRIB(addressFamily, route.RIBType(syscall.NET_RT_FLAGS), syscall.RTF_LLINFO)
+	if err != nil {
+		return nil, err
+	}
+	messages, err := route.ParseRIB(route.RIBType(syscall.NET_RT_FLAGS), rib)
+	if err != nil {
+		return nil, err
+	}
+	var entries []adapter.NeighborEntry
+	for _, message := range messages {
+		routeMessage, isRouteMessage := message.(*route.RouteMessage)
+		if !isRouteMessage {
+			continue
+		}
+		address, macAddress, ok := parseRouteNeighborEntry(routeMessage)
+		if !ok {
+			continue
+		}
+		entries = append(entries, adapter.NeighborEntry{
+			Address:    address,
+			MACAddress: macAddress,
+		})
+	}
+	return entries, nil
+}
+
+func parseRouteNeighborEntry(message *route.RouteMessage) (address netip.Addr, macAddress net.HardwareAddr, ok bool) {
+	if len(message.Addrs) <= unix.RTAX_GATEWAY {
+		return
+	}
+	gateway, isLinkAddr := message.Addrs[unix.RTAX_GATEWAY].(*route.LinkAddr)
+	if !isLinkAddr || len(gateway.Addr) < 6 {
+		return
+	}
+	switch destination := message.Addrs[unix.RTAX_DST].(type) {
+	case *route.Inet4Addr:
+		address = netip.AddrFrom4(destination.IP)
+	case *route.Inet6Addr:
+		address = netip.AddrFrom16(destination.IP)
+	default:
+		return
+	}
+	macAddress = net.HardwareAddr(make([]byte, len(gateway.Addr)))
+	copy(macAddress, gateway.Addr)
+	ok = true
+	return
+}
+
+func ParseRouteNeighborMessage(message *route.RouteMessage) (address netip.Addr, macAddress net.HardwareAddr, isDelete bool, ok bool) {
+	isDelete = message.Type == unix.RTM_DELETE
+	if len(message.Addrs) <= unix.RTAX_GATEWAY {
+		return
+	}
+	switch destination := message.Addrs[unix.RTAX_DST].(type) {
+	case *route.Inet4Addr:
+		address = netip.AddrFrom4(destination.IP)
+	case *route.Inet6Addr:
+		address = netip.AddrFrom16(destination.IP)
+	default:
+		return
+	}
+	if !isDelete {
+		gateway, isLinkAddr := message.Addrs[unix.RTAX_GATEWAY].(*route.LinkAddr)
+		if !isLinkAddr || len(gateway.Addr) < 6 {
+			return
+		}
+		macAddress = net.HardwareAddr(make([]byte, len(gateway.Addr)))
+		copy(macAddress, gateway.Addr)
+	}
+	ok = true
+	return
+}

route/router.go

@@ -159,8 +159,7 @@ func (r *Router) Start(stage adapter.StartStage) error {
 				} else {
 					r.neighborResolver = resolver
 				}
-			}
-			if r.neighborResolver == nil {
+			} else {
 				monitor.Start("initialize neighbor resolver")
 				resolver, err := newNeighborResolver(r.logger, r.leaseFiles)
 				monitor.Finish()