set default tun name

listener/tun/tun_darwin.go

@@ -10,12 +10,19 @@ import (
 	tun_util "github.com/go-gost/x/internal/util/tun"
 )
 
+const (
+	defaultTunName = "utun"
+)
+
 func (l *tunListener) createTun() (ifce io.ReadWriteCloser, name string, ip net.IP, err error) {
 	ip, _, err = net.ParseCIDR(l.md.config.Net)
 	if err != nil {
 		return
 	}
 
+	if l.md.config.Name == "" {
+		l.md.config.Name = defaultTunName
+	}
 	ifce, name, err = l.createTunDevice()
 	if err != nil {
 		return

listener/tun/tun_linux.go

@@ -4,63 +4,63 @@ import (
 	"fmt"
 	"io"
 	"net"
-	"os/exec"
-	"strings"
+
+	"github.com/vishvananda/netlink"
 
 	tun_util "github.com/go-gost/x/internal/util/tun"
 )
 
-func (l *tunListener) createTun() (ifce io.ReadWriteCloser, name string, ip net.IP, err error) {
-	ip, _, err = net.ParseCIDR(l.md.config.Net)
+func (l *tunListener) createTun() (dev io.ReadWriteCloser, name string, ip net.IP, err error) {
+	ip, ipNet, err := net.ParseCIDR(l.md.config.Net)
 	if err != nil {
 		return
 	}
 
-	ifce, name, err = l.createTunDevice()
+	dev, name, err = l.createTunDevice()
 	if err != nil {
 		return
 	}
 
-	/*
-		if err = l.exeCmd(fmt.Sprintf("ip link set dev %s mtu %d", name, l.md.config.MTU)); err != nil {
-			l.logger.Warn(err)
-		}
-	*/
-
-	if err = l.exeCmd(fmt.Sprintf("ip address add %s dev %s", l.md.config.Net, name)); err != nil {
-		l.logger.Warn(err)
+	ifce, err := net.InterfaceByName(name)
+	if err != nil {
+		return
 	}
 
-	if err = l.exeCmd(fmt.Sprintf("ip link set dev %s up", name)); err != nil {
-		l.logger.Warn(err)
+	link, err := netlink.LinkByName(name)
+	if err != nil {
+		return
 	}
 
-	if err = l.addRoutes(name, l.md.config.Routes...); err != nil {
+	if err = netlink.AddrAdd(link, &netlink.Addr{
+		IPNet: &net.IPNet{
+			IP:   ip,
+			Mask: ipNet.Mask,
+		},
+	}); err != nil {
+		return
+	}
+	if err = netlink.LinkSetUp(link); err != nil {
+		return
+	}
+
+	if err = l.addRoutes(ifce, l.md.config.Routes...); err != nil {
 		return
 	}
 
 	return
 }
 
-func (l *tunListener) exeCmd(cmd string) error {
-	l.logger.Debug(cmd)
-
-	args := strings.Split(cmd, " ")
-	if err := exec.Command(args[0], args[1:]...).Run(); err != nil {
-		return fmt.Errorf("%s: %v", cmd, err)
-	}
-
-	return nil
-}
-
-func (l *tunListener) addRoutes(ifName string, routes ...tun_util.Route) error {
+func (l *tunListener) addRoutes(ifce *net.Interface, routes ...tun_util.Route) error {
 	for _, route := range routes {
-		cmd := fmt.Sprintf("ip route add %s dev %s", route.Net.String(), ifName)
-		l.logger.Debug(cmd)
-
-		args := strings.Split(cmd, " ")
-		if er := exec.Command(args[0], args[1:]...).Run(); er != nil {
-			l.logger.Warnf("%s: %v", cmd, er)
+		r := netlink.Route{
+			Dst: &route.Net,
+			Gw:  route.Gateway,
+		}
+		if r.Gw == nil {
+			r.LinkIndex = ifce.Index
+		}
+		if err := netlink.RouteReplace(&r); err != nil {
+			return fmt.Errorf("add route %v %v: %v", r.Dst, r.Gw, err)
 		}
 	}
 	return nil

listener/tun/tun_unix.go

@@ -12,12 +12,19 @@ import (
 	tun_util "github.com/go-gost/x/internal/util/tun"
 )
 
+const (
+	defaultTunName = "tun0"
+)
+
 func (l *tunListener) createTun() (ifce io.ReadWriteCloser, name string, ip net.IP, err error) {
 	ip, _, err = net.ParseCIDR(l.md.config.Net)
 	if err != nil {
 		return
 	}
 
+	if l.md.config.Name == "" {
+		l.md.config.Name = defaultTunName
+	}
 	ifce, name, err = l.createTunDevice()
 	if err != nil {
 		return