tungo: additional metadata options

handler/tungo/handler.go

@@ -20,6 +20,7 @@ import (
 	"github.com/go-gost/x/registry"
 	"github.com/xjasonlyu/tun2socks/v2/core"
 	"github.com/xjasonlyu/tun2socks/v2/core/adapter"
+	"github.com/xjasonlyu/tun2socks/v2/core/option"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
 )
 
@@ -129,9 +130,22 @@ func (h *tungoHandler) Handle(ctx context.Context, conn net.Conn, opts ...handle
 	th.ProcessAsync()
 	defer th.Close()
 
+	var cOpts []option.Option
+	if h.md.tcpModerateReceiveBuffer {
+		cOpts = append(cOpts, option.WithTCPModerateReceiveBuffer(h.md.tcpModerateReceiveBuffer))
+	}
+	if h.md.tcpSendBufferSize > 0 {
+		cOpts = append(cOpts, option.WithTCPSendBufferSize(h.md.tcpSendBufferSize))
+	}
+	if h.md.tcpReceiveBufferSize > 0 {
+		cOpts = append(cOpts, option.WithTCPReceiveBufferSize(h.md.tcpReceiveBufferSize))
+	}
+
 	stack, err := core.CreateStack(&core.Config{
 		LinkEndpoint:     newEndpoint(conn, config.MTU, log),
 		TransportHandler: th,
+		MulticastGroups:  h.md.multicastGroups,
+		Options:          cOpts,
 	})
 	if err != nil {
 		return err

handler/tungo/metadata.go

@@ -1,6 +1,9 @@
 package tungo
 
 import (
+	"fmt"
+	"net/netip"
+	"strings"
 	"time"
 
 	mdata "github.com/go-gost/core/metadata"
@@ -11,7 +14,7 @@ type metadata struct {
 	udpTimeout time.Duration
 
 	sniffing                bool
-	sniffingUDP                bool
+	sniffingUDP             bool
 	sniffingTimeout         time.Duration
 	sniffingResponseTimeout time.Duration
 	sniffingFallback        bool
@@ -21,10 +24,16 @@ type metadata struct {
 
 	limiterRefreshInterval time.Duration
 	limiterCleanupInterval time.Duration
+
+	multicastGroups []netip.Addr
+
+	tcpSendBufferSize        int
+	tcpReceiveBufferSize     int
+	tcpModerateReceiveBuffer bool
 }
 
 func (h *tungoHandler) parseMetadata(md mdata.Metadata) (err error) {
-	h.md.udpTimeout = mdutil.GetDuration(md, "udpTimeout")
+	h.md.udpTimeout = mdutil.GetDuration(md, "udpTimeout", "tungo.udpTimeout")
 
 	h.md.sniffing = mdutil.GetBool(md, "sniffing")
 	h.md.sniffingUDP = mdutil.GetBool(md, "sniffing.udp")
@@ -44,5 +53,23 @@ func (h *tungoHandler) parseMetadata(md mdata.Metadata) (err error) {
 	h.md.limiterRefreshInterval = mdutil.GetDuration(md, "limiter.refreshInterval")
 	h.md.limiterCleanupInterval = mdutil.GetDuration(md, "limiter.cleanupInterval")
 
+	for _, v := range strings.Split(mdutil.GetString(md, "multicastGroups", "tungo.multicastGroups"), ",") {
+		if v = strings.TrimSpace(v); v == "" {
+			continue
+		}
+		addr, err := netip.ParseAddr(v)
+		if err != nil {
+			return err
+		}
+		if !addr.IsMulticast() {
+			return fmt.Errorf("invalid multicast IP: %s", addr)
+		}
+		h.md.multicastGroups = append(h.md.multicastGroups, addr)
+	}
+
+	h.md.tcpSendBufferSize = mdutil.GetInt(md, "tcpSendBufferSize", "tungo.tcpSendBufferSize")
+	h.md.tcpReceiveBufferSize = mdutil.GetInt(md, "tcpReceiveBufferSize", "tungo.tcpReceiveBufferSize")
+	h.md.tcpModerateReceiveBuffer = mdutil.GetBool(md, "tcpModerateReceiveBuffer", "tungo.tcpModerateReceiveBuffer")
+
 	return
 }

internal/net/pipe.go

@@ -12,7 +12,7 @@ import (
 
 const (
 	// tcpWaitTimeout implements a TCP half-close timeout.
-	tcpWaitTimeout = 30 * time.Second
+	tcpWaitTimeout = 10 * time.Second
 )
 
 func Pipe(ctx context.Context, rw1, rw2 io.ReadWriter) error {

listener/tun/metadata.go

@@ -19,6 +19,7 @@ const (
 
 type metadata struct {
 	config *tun_util.Config
+	guid   string
 }
 
 func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
@@ -102,5 +103,7 @@ func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
 
 	l.md.config = config
 
+	l.md.guid = mdutil.GetString(md, "guid", "tun.guid")
+
 	return
 }

listener/tun/tun_windows.go

@@ -6,6 +6,9 @@ import (
 	"net"
 	"os/exec"
 	"strings"
+
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/tun"
 )
 
 const (
@@ -14,15 +17,40 @@ const (
 	writeOffset    = 0
 )
 
+func init() {
+	tun.WintunTunnelType = "GOST"
+}
+
 func (l *tunListener) createTun() (ifce io.ReadWriteCloser, name string, ip net.IP, err error) {
 	if l.md.config.Name == "" {
 		l.md.config.Name = defaultTunName
 	}
+
+	if l.md.guid != "" {
+		var guid windows.GUID
+		guid, err = windows.GUIDFromString(l.md.guid)
+		if err != nil {
+			return
+		}
+		tun.WintunStaticRequestedGUID = &guid
+	}
+
 	ifce, name, err = l.createTunDevice()
 	if err != nil {
 		return
 	}
 
+	if l.md.config.MTU > 0 {
+		cmd := fmt.Sprintf("netsh interface ip set subinterface %s mtu=%d", name, l.md.config.MTU)
+		l.log.Debug(cmd)
+
+		args := strings.Split(cmd, " ")
+		if er := exec.Command(args[0], args[1:]...).Run(); er != nil {
+			err = fmt.Errorf("%s: %v", cmd, er)
+			return
+		}
+	}
+
 	if len(l.md.config.Net) > 0 {
 		ipNet := l.md.config.Net[0]
 		cmd := fmt.Sprintf("netsh interface ip set address name=%s "+

listener/tungo/metadata.go

@@ -12,12 +12,12 @@ import (
 )
 
 const (
-	defaultMTU  = 1420
+	defaultMTU = 1420
-	defaultName = "tungo"
 )
 
 type metadata struct {
 	config *tun_util.Config
+	guid   string
 }
 
 func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
@@ -29,9 +29,6 @@ func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
 	if config.MTU <= 0 {
 		config.MTU = defaultMTU
 	}
-	if config.Name == "" {
-		config.Name = defaultName
-	}
 	if gw := mdutil.GetString(md, "gw", "tun.gw"); gw != "" {
 		config.Gateway = net.ParseIP(gw)
 	}
@@ -93,5 +90,7 @@ func (l *tunListener) parseMetadata(md mdata.Metadata) (err error) {
 
 	l.md.config = config
 
+	l.md.guid = mdutil.GetString(md, "guid", "tun.guid")
+
 	return
 }

listener/tungo/tun_linux.go

@@ -11,11 +11,15 @@ import (
 )
 
 const (
-	readOffset  = 0
+	defaultTunName = "tungo"
-	writeOffset = 16
+	readOffset     = 0
+	writeOffset    = 16
 )
 
 func (l *tunListener) createTun() (dev io.ReadWriteCloser, name string, ip net.IP, err error) {
+	if l.md.config.Name == "" {
+		l.md.config.Name = defaultTunName
+	}
 	dev, name, err = l.createTunDevice()
 	if err != nil {
 		return

listener/tungo/tun_other.go

@@ -11,7 +11,7 @@ import (
 )
 
 const (
-	defaultTunName = "tun0"
+	defaultTunName = "tungo"
 	readOffset     = 4
 	writeOffset    = 4
 )

listener/tungo/tun_windows.go

@@ -6,23 +6,51 @@ import (
 	"net"
 	"os/exec"
 	"strings"
+
+	"golang.org/x/sys/windows"
+	"golang.zx2c4.com/wireguard/tun"
 )
 
 const (
-	defaultTunName = "wintun"
+	defaultTunName = "tungo"
 	readOffset     = 0
 	writeOffset    = 0
 )
 
+func init() {
+	tun.WintunTunnelType = "GOST"
+}
+
 func (l *tunListener) createTun() (ifce io.ReadWriteCloser, name string, ip net.IP, err error) {
 	if l.md.config.Name == "" {
 		l.md.config.Name = defaultTunName
 	}
+
+	if l.md.guid != "" {
+		var guid windows.GUID
+		guid, err = windows.GUIDFromString(l.md.guid)
+		if err != nil {
+			return
+		}
+		tun.WintunStaticRequestedGUID = &guid
+	}
+
 	ifce, name, err = l.createTunDevice()
 	if err != nil {
 		return
 	}
 
+	if l.md.config.MTU > 0  {
+		cmd := fmt.Sprintf("netsh interface ip set subinterface %s mtu=%d", name, l.md.config.MTU)
+		l.log.Debug(cmd)
+
+		args := strings.Split(cmd, " ")
+		if er := exec.Command(args[0], args[1:]...).Run(); er != nil {
+			err = fmt.Errorf("%s: %v", cmd, er)
+			return
+		}
+	}
+
 	if len(l.md.config.Net) > 0 {
 		ipNet := l.md.config.Net[0]
 		cmd := fmt.Sprintf("netsh interface ip set address name=%s "+