From 03b956b7a31311bece31d02098ed51b77e3e6dee Mon Sep 17 00:00:00 2001
From: Skyxim <noreply@skyxim.com>
Date: Sat, 22 Jan 2022 13:24:31 +0800
Subject: [PATCH] [Fixed] auto-route support use ip route

---
 config/config.go              |  2 +-
 listener/tun/dev/dev_linux.go | 21 ++++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/config/config.go b/config/config.go
index 1a2d218f..d4437865 100644
--- a/config/config.go
+++ b/config/config.go
@@ -208,7 +208,7 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 		Tun: Tun{
 			Enable:    false,
 			Stack:     "gvisor",
-			DnsHijack: []string{},
+			DnsHijack: []string{"198.18.0.2:53"},
 			AutoRoute: false,
 		},
 		DNS: RawDNS{
diff --git a/listener/tun/dev/dev_linux.go b/listener/tun/dev/dev_linux.go
index aeb90d4e..d43433ad 100644
--- a/listener/tun/dev/dev_linux.go
+++ b/listener/tun/dev/dev_linux.go
@@ -63,8 +63,9 @@ func OpenTunDevice(tunAddress string, autoRoute bool) (TunDevice, error) {
 		}
 
 		if autoRoute {
-			log.Warnln("linux unsupported automatic route")
+			addRoute(tunAddress)
 		}
+
 		return dev, nil
 	case "fd":
 		fd, err := strconv.ParseInt(deviceURL.Host, 10, 32)
@@ -328,3 +329,21 @@ func GetAutoDetectInterface() (string, error) {
 	}
 	return out.String(), nil
 }
+
+func addRoute(gateway string) {
+	cmd := exec.Command("route", "add", "default", "gw", gateway)
+	var stderr bytes.Buffer
+	cmd.Stderr = &stderr
+	if err := cmd.Run(); err != nil {
+		log.Errorln("[auto route] Failed to add system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
+	}
+}
+
+func delRoute(gateway string) {
+	cmd := exec.Command("ip", "route", "delete", "gw")
+	var stderr bytes.Buffer
+	cmd.Stderr = &stderr
+	if err := cmd.Run(); err != nil {
+		log.Errorln("[auto route] Failed to delete system route: %s: %s , cmd: %s", err.Error(), stderr.String(), cmd.String())
+	}
+}