Feature: add reject proxy

engine/parse.go

@@ -48,6 +48,8 @@ func parseProxy(s string) (proxy.Proxy, error) {
 	switch protocol {
 	case proto.Direct.String():
 		return proxy.NewDirect(), nil
+	case proto.Reject.String():
+		return proxy.NewReject(), nil
 	case proto.Socks5.String():
 		return proxy.NewSocks5(parseSocks(u))
 	case proto.Shadowsocks.String():

proxy/proto/proto.go

@@ -4,6 +4,7 @@ import "fmt"
 
 const (
 	Direct Proto = iota
+	Reject
 	Shadowsocks
 	Socks5
 )
@@ -14,6 +15,8 @@ func (proto Proto) String() string {
 	switch proto {
 	case Direct:
 		return "direct"
+	case Reject:
+		return "reject"
 	case Shadowsocks:
 		return "ss"
 	case Socks5:

proxy/reject.go

@@ -0,0 +1,32 @@
+package proxy
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	M "github.com/xjasonlyu/tun2socks/constant"
+	"github.com/xjasonlyu/tun2socks/proxy/proto"
+)
+
+var _ Proxy = (*Reject)(nil)
+
+type Reject struct {
+	*Base
+}
+
+func NewReject() *Reject {
+	return &Reject{
+		Base: &Base{
+			proto: proto.Reject,
+		},
+	}
+}
+
+func (r *Reject) DialContext(context.Context, *M.Metadata) (net.Conn, error) {
+	return nil, errors.New("TCP rejected")
+}
+
+func (r *Reject) DialUDP(*M.Metadata) (net.PacketConn, error) {
+	return nil, errors.New("UDP rejected")
+}