Change: use nop for reject

proxy/reject.go

@@ -2,8 +2,9 @@ package proxy
 
 import (
 	"context"
-	"errors"
+	"io"
 	"net"
+	"time"
 
 	M "github.com/xjasonlyu/tun2socks/constant"
 	"github.com/xjasonlyu/tun2socks/proxy/proto"
@@ -24,9 +25,30 @@ func NewReject() *Reject {
 }
 
 func (r *Reject) DialContext(context.Context, *M.Metadata) (net.Conn, error) {
-	return nil, errors.New("TCP rejected")
+	return &nopConn{}, nil
 }
 
 func (r *Reject) DialUDP(*M.Metadata) (net.PacketConn, error) {
-	return nil, errors.New("UDP rejected")
+	return &nopPacketConn{}, nil
 }
+
+type nopConn struct{}
+
+func (rw *nopConn) Read([]byte) (int, error)         { return 0, io.EOF }
+func (rw *nopConn) Write([]byte) (int, error)        { return 0, io.EOF }
+func (rw *nopConn) Close() error                     { return nil }
+func (rw *nopConn) LocalAddr() net.Addr              { return nil }
+func (rw *nopConn) RemoteAddr() net.Addr             { return nil }
+func (rw *nopConn) SetDeadline(time.Time) error      { return nil }
+func (rw *nopConn) SetReadDeadline(time.Time) error  { return nil }
+func (rw *nopConn) SetWriteDeadline(time.Time) error { return nil }
+
+type nopPacketConn struct{}
+
+func (npc *nopPacketConn) WriteTo(b []byte, _ net.Addr) (n int, err error) { return len(b), nil }
+func (npc *nopPacketConn) ReadFrom([]byte) (int, net.Addr, error)          { return 0, nil, io.EOF }
+func (npc *nopPacketConn) Close() error                                    { return nil }
+func (npc *nopPacketConn) LocalAddr() net.Addr                             { return &net.UDPAddr{IP: net.IPv4zero, Port: 0} }
+func (npc *nopPacketConn) SetDeadline(time.Time) error                     { return nil }
+func (npc *nopPacketConn) SetReadDeadline(time.Time) error                 { return nil }
+func (npc *nopPacketConn) SetWriteDeadline(time.Time) error                { return nil }