github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/test/packetimpact/tests/tcp_noaccept_close_rst_test.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package tcp_noaccept_close_rst_test
    16  
    17  import (
    18  	"flag"
    19  	"testing"
    20  	"time"
    21  
    22  	"golang.org/x/sys/unix"
    23  	"github.com/SagerNet/gvisor/pkg/tcpip/header"
    24  	"github.com/SagerNet/gvisor/test/packetimpact/testbench"
    25  )
    26  
    27  func init() {
    28  	testbench.Initialize(flag.CommandLine)
    29  }
    30  
    31  func TestTcpNoAcceptCloseReset(t *testing.T) {
    32  	dut := testbench.NewDUT(t)
    33  	listenFd, remotePort := dut.CreateListener(t, unix.SOCK_STREAM, unix.IPPROTO_TCP, 1)
    34  	conn := dut.Net.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort})
    35  	conn.Connect(t)
    36  	defer conn.Close(t)
    37  	// We need to wait for POLLIN event on listenFd to know the connection is
    38  	// established. Otherwise there could be a race when we issue the Close
    39  	// command prior to the DUT receiving the last ack of the handshake and
    40  	// it will only respond RST instead of RST+ACK.
    41  	dut.PollOne(t, listenFd, unix.POLLIN, time.Second)
    42  	dut.Close(t, listenFd)
    43  	if _, err := conn.Expect(t, testbench.TCP{Flags: testbench.TCPFlags(header.TCPFlagRst | header.TCPFlagAck)}, 1*time.Second); err != nil {
    44  		t.Fatalf("expected a RST-ACK packet but got none: %s", err)
    45  	}
    46  }