Add darwin monitor

go.mod

@@ -4,8 +4,9 @@ go 1.18
 
 require (
 	github.com/sagernet/netlink v0.0.0-20220803045538-bdac49abf805
-	github.com/sagernet/sing v0.0.0-20220730061053-a21e329a2698
-	golang.org/x/sys v0.0.0-20220731174439-a90be440212d
+	github.com/sagernet/sing v0.0.0-20220801112236-1bb95f9661fc
+	golang.org/x/net v0.0.0-20220802222814-0bcc04d9c69b
+	golang.org/x/sys v0.0.0-20220803195053-6e608f9ce704
 	gvisor.dev/gvisor v0.0.0-20220711011657-cecae2f4234d
 )
 

go.sum

@@ -2,13 +2,15 @@ github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4=
 github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA=
 github.com/sagernet/netlink v0.0.0-20220803045538-bdac49abf805 h1:hE+vtsjBCCPmxkRz9jZA+CicHgVkDT6H+Av5ZzskVxs=
 github.com/sagernet/netlink v0.0.0-20220803045538-bdac49abf805/go.mod h1:xLnfdiJbSp8rNqYEdIW/6eDO4mVoogml14Bh2hSiFpM=
-github.com/sagernet/sing v0.0.0-20220730061053-a21e329a2698 h1:wjoF4/FOwze8cN2/EvQyyuq1tzXjxNViPIoqQ7CNIb8=
-github.com/sagernet/sing v0.0.0-20220730061053-a21e329a2698/go.mod h1:GbtQfZSpmtD3cXeD1qX2LCMwY8dH+bnnInDTqd92IsM=
+github.com/sagernet/sing v0.0.0-20220801112236-1bb95f9661fc h1:x7H64IiqyrpxPWl/KrWkknzEK4GmpqgfZeVKFVw6E/M=
+github.com/sagernet/sing v0.0.0-20220801112236-1bb95f9661fc/go.mod h1:GbtQfZSpmtD3cXeD1qX2LCMwY8dH+bnnInDTqd92IsM=
 github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 h1:gga7acRE695APm9hlsSMoOoE65U4/TcqNj90mc69Rlg=
 github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+golang.org/x/net v0.0.0-20220802222814-0bcc04d9c69b h1:3ogNYyK4oIQdIKzTu68hQrr4iuVxF3AxKl9Aj/eDrw0=
+golang.org/x/net v0.0.0-20220802222814-0bcc04d9c69b/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
 golang.org/x/sys v0.0.0-20200217220822-9197077df867/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20220731174439-a90be440212d h1:Sv5ogFZatcgIMMtBSTTAgMYsicp25MXBubjXNDKwm80=
-golang.org/x/sys v0.0.0-20220731174439-a90be440212d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220803195053-6e608f9ce704 h1:Y7NOhdqIOU8kYI7BxsgL38d0ot0raxvcW+EMQU2QrT4=
+golang.org/x/sys v0.0.0-20220803195053-6e608f9ce704/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0 h1:/5xXl8Y5W96D+TtHSlonuFqGHIWVuyCkGJLwGh9JJFs=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 gvisor.dev/gvisor v0.0.0-20220711011657-cecae2f4234d h1:KjI6i6P1ib9DiNdNIN8pb2TXfBewpKHf3O58cjj9vw4=

gvisor.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

gvisor_err.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

gvisor_log.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

gvisor_udp.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

monitor_android.go

@@ -2,7 +2,6 @@ package tun
 
 import (
 	"github.com/sagernet/netlink"
-	E "github.com/sagernet/sing/common/exceptions"
 )
 
 func (m *defaultInterfaceMonitor) checkUpdate() error {
@@ -19,7 +18,7 @@ func (m *defaultInterfaceMonitor) checkUpdate() error {
 	}
 
 	if defaultTableIndex == 0 {
-		return E.New("no route to internet")
+		return ErrNoRoute
 	}
 
 	routes, err := netlink.RouteListFiltered(netlink.FAMILY_ALL, &netlink.Route{Table: defaultTableIndex}, netlink.RT_FILTER_TABLE)
@@ -47,5 +46,5 @@ func (m *defaultInterfaceMonitor) checkUpdate() error {
 		return nil
 	}
 
-	return E.New("no route in the system table")
+	return ErrNoRoute
 }

monitor_darwin.go

@@ -0,0 +1,171 @@
+package tun
+
+import (
+	"context"
+	"net"
+	"net/netip"
+	"os"
+	"sync"
+
+	"github.com/sagernet/sing/common"
+	E "github.com/sagernet/sing/common/exceptions"
+	"github.com/sagernet/sing/common/x/list"
+
+	"golang.org/x/net/route"
+	"golang.org/x/sys/unix"
+)
+
+type networkUpdateMonitor struct {
+	errorHandler E.Handler
+
+	access      sync.Mutex
+	callbacks   list.List[NetworkUpdateCallback]
+	routeSocket *os.File
+}
+
+func NewNetworkUpdateMonitor(errorHandler E.Handler) (NetworkUpdateMonitor, error) {
+	return &networkUpdateMonitor{
+		errorHandler: errorHandler,
+	}, nil
+}
+
+func (m *networkUpdateMonitor) RegisterCallback(callback NetworkUpdateCallback) *list.Element[NetworkUpdateCallback] {
+	m.access.Lock()
+	defer m.access.Unlock()
+	return m.callbacks.PushBack(callback)
+}
+
+func (m *networkUpdateMonitor) UnregisterCallback(element *list.Element[NetworkUpdateCallback]) {
+	m.access.Lock()
+	defer m.access.Unlock()
+	m.callbacks.Remove(element)
+}
+
+func (m *networkUpdateMonitor) emit() {
+	m.access.Lock()
+	callbacks := m.callbacks.Array()
+	m.access.Unlock()
+	for _, callback := range callbacks {
+		err := callback()
+		if err != nil {
+			m.errorHandler.NewError(context.Background(), err)
+		}
+	}
+}
+
+func (m *networkUpdateMonitor) Start() error {
+	routeSocket, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		return err
+	}
+	err = unix.SetNonblock(routeSocket, true)
+	if err != nil {
+		return err
+	}
+	m.routeSocket = os.NewFile(uintptr(routeSocket), "route")
+	go m.loopUpdate()
+	return nil
+}
+
+func (m *networkUpdateMonitor) loopUpdate() {
+	rawConn, err := m.routeSocket.SyscallConn()
+	if err != nil {
+		m.errorHandler.NewError(context.Background(), err)
+		return
+	}
+	for {
+		var innerErr error
+		err = rawConn.Read(func(fd uintptr) (done bool) {
+			var msg [2048]byte
+			_, innerErr = unix.Read(int(fd), msg[:])
+			return innerErr != unix.EWOULDBLOCK
+		})
+		if innerErr != nil {
+			err = innerErr
+		}
+		if err != nil {
+			break
+		}
+		m.emit()
+	}
+	if !E.IsClosed(err) {
+		m.errorHandler.NewError(context.Background(), err)
+	}
+}
+
+func (m *networkUpdateMonitor) Close() error {
+	return common.Close(common.PtrOrNil(m.routeSocket))
+}
+
+type defaultInterfaceMonitor struct {
+	defaultInterfaceName  string
+	defaultInterfaceIndex int
+	networkMonitor        NetworkUpdateMonitor
+	element               *list.Element[NetworkUpdateCallback]
+	callback              DefaultInterfaceUpdateCallback
+}
+
+func NewDefaultInterfaceMonitor(networkMonitor NetworkUpdateMonitor, callback DefaultInterfaceUpdateCallback) (DefaultInterfaceMonitor, error) {
+	return &defaultInterfaceMonitor{
+		networkMonitor: networkMonitor,
+		callback:       callback,
+	}, nil
+}
+
+func (m *defaultInterfaceMonitor) Start() error {
+	err := m.checkUpdate()
+	if err != nil {
+		return err
+	}
+	m.element = m.networkMonitor.RegisterCallback(m.checkUpdate)
+	return nil
+}
+
+func (m *defaultInterfaceMonitor) Close() error {
+	m.networkMonitor.UnregisterCallback(m.element)
+	return nil
+}
+
+func (m *defaultInterfaceMonitor) DefaultInterfaceName() string {
+	return m.defaultInterfaceName
+}
+
+func (m *defaultInterfaceMonitor) DefaultInterfaceIndex() int {
+	return m.defaultInterfaceIndex
+}
+
+func (m *defaultInterfaceMonitor) checkUpdate() error {
+	ribMessage, err := route.FetchRIB(unix.AF_UNSPEC, route.RIBTypeRoute, 0)
+	if err != nil {
+		return err
+	}
+	routeMessages, err := route.ParseRIB(route.RIBTypeRoute, ribMessage)
+	if err != nil {
+		return err
+	}
+	for _, rawRouteMessage := range routeMessages {
+		routeMessage := rawRouteMessage.(*route.RouteMessage)
+		if common.Any(common.FilterIsInstance(routeMessage.Addrs, func(it route.Addr) (*route.Inet4Addr, bool) {
+			addr, loaded := it.(*route.Inet4Addr)
+			return addr, loaded
+		}), func(addr *route.Inet4Addr) bool {
+			return addr.IP == netip.IPv4Unspecified().As4()
+		}) {
+			oldInterface := m.defaultInterfaceName
+			oldIndex := m.defaultInterfaceIndex
+
+			m.defaultInterfaceIndex = routeMessage.Index
+			defaultInterface, err := net.InterfaceByIndex(routeMessage.Index)
+			if err != nil {
+				return err
+			}
+			m.defaultInterfaceName = defaultInterface.Name
+			if oldInterface == m.defaultInterfaceName && oldIndex == m.defaultInterfaceIndex {
+				return nil
+			}
+			m.callback()
+			return nil
+		}
+	}
+	return ErrNoRoute
+}

monitor_other.go

@@ -1,4 +1,4 @@
-//go:build !linux && !windows
+//go:build !(linux || windows || darwin)
 
 package tun
 

tun.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

tun_linux.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (

tun_other.go

@@ -1,4 +1,4 @@
-//go:build !linux && !windows
+//go:build no_gvisor || !(linux || windows)
 
 package tun
 

tun_stub.go

@@ -0,0 +1,7 @@
+//go:build no_gvisor
+
+package tun
+
+type Tun interface {
+	Close() error
+}

tun_windows.go

@@ -1,3 +1,5 @@
+//go:build !no_gvisor
+
 package tun
 
 import (