github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/pkg/fdchannel/fdchannel_test.go (about)

     1  // Copyright 2019 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 fdchannel
    16  
    17  import (
    18  	"io/ioutil"
    19  	"os"
    20  	"syscall"
    21  	"testing"
    22  	"time"
    23  
    24  	"golang.org/x/sys/unix"
    25  	"github.com/SagerNet/gvisor/pkg/sync"
    26  )
    27  
    28  func TestSendRecvFD(t *testing.T) {
    29  	sendFile, err := ioutil.TempFile("", "fdchannel_test_")
    30  	if err != nil {
    31  		t.Fatalf("failed to create temporary file: %v", err)
    32  	}
    33  	defer sendFile.Close()
    34  
    35  	chanFDs, err := NewConnectedSockets()
    36  	if err != nil {
    37  		t.Fatalf("failed to create fdchannel sockets: %v", err)
    38  	}
    39  	sendEP := NewEndpoint(chanFDs[0])
    40  	defer sendEP.Destroy()
    41  	recvEP := NewEndpoint(chanFDs[1])
    42  	defer recvEP.Destroy()
    43  
    44  	recvFD, err := recvEP.RecvFDNonblock()
    45  	if err != unix.EAGAIN && err != unix.EWOULDBLOCK {
    46  		t.Errorf("RecvFDNonblock before SendFD: got (%d, %v), wanted (<unspecified>, EAGAIN or EWOULDBLOCK", recvFD, err)
    47  	}
    48  
    49  	if err := sendEP.SendFD(int(sendFile.Fd())); err != nil {
    50  		t.Fatalf("SendFD failed: %v", err)
    51  	}
    52  	recvFD, err = recvEP.RecvFD()
    53  	if err != nil {
    54  		t.Fatalf("RecvFD failed: %v", err)
    55  	}
    56  	recvFile := os.NewFile(uintptr(recvFD), "received file")
    57  	defer recvFile.Close()
    58  
    59  	sendInfo, err := sendFile.Stat()
    60  	if err != nil {
    61  		t.Fatalf("failed to stat sent file: %v", err)
    62  	}
    63  	sendInfoSys := sendInfo.Sys()
    64  	sendStat, ok := sendInfoSys.(*syscall.Stat_t)
    65  	if !ok {
    66  		t.Fatalf("sent file's FileInfo is backed by unknown type %T", sendInfoSys)
    67  	}
    68  
    69  	recvInfo, err := recvFile.Stat()
    70  	if err != nil {
    71  		t.Fatalf("failed to stat received file: %v", err)
    72  	}
    73  	recvInfoSys := recvInfo.Sys()
    74  	recvStat, ok := recvInfoSys.(*syscall.Stat_t)
    75  	if !ok {
    76  		t.Fatalf("received file's FileInfo is backed by unknown type %T", recvInfoSys)
    77  	}
    78  
    79  	if sendStat.Dev != recvStat.Dev || sendStat.Ino != recvStat.Ino {
    80  		t.Errorf("sent file (dev=%d, ino=%d) does not match received file (dev=%d, ino=%d)", sendStat.Dev, sendStat.Ino, recvStat.Dev, recvStat.Ino)
    81  	}
    82  }
    83  
    84  func TestShutdownThenRecvFD(t *testing.T) {
    85  	sendFile, err := ioutil.TempFile("", "fdchannel_test_")
    86  	if err != nil {
    87  		t.Fatalf("failed to create temporary file: %v", err)
    88  	}
    89  	defer sendFile.Close()
    90  
    91  	chanFDs, err := NewConnectedSockets()
    92  	if err != nil {
    93  		t.Fatalf("failed to create fdchannel sockets: %v", err)
    94  	}
    95  	sendEP := NewEndpoint(chanFDs[0])
    96  	defer sendEP.Destroy()
    97  	recvEP := NewEndpoint(chanFDs[1])
    98  	defer recvEP.Destroy()
    99  
   100  	recvEP.Shutdown()
   101  	if _, err := recvEP.RecvFD(); err == nil {
   102  		t.Error("RecvFD succeeded unexpectedly")
   103  	}
   104  }
   105  
   106  func TestRecvFDThenShutdown(t *testing.T) {
   107  	sendFile, err := ioutil.TempFile("", "fdchannel_test_")
   108  	if err != nil {
   109  		t.Fatalf("failed to create temporary file: %v", err)
   110  	}
   111  	defer sendFile.Close()
   112  
   113  	chanFDs, err := NewConnectedSockets()
   114  	if err != nil {
   115  		t.Fatalf("failed to create fdchannel sockets: %v", err)
   116  	}
   117  	sendEP := NewEndpoint(chanFDs[0])
   118  	defer sendEP.Destroy()
   119  	recvEP := NewEndpoint(chanFDs[1])
   120  	defer recvEP.Destroy()
   121  
   122  	var receiverWG sync.WaitGroup
   123  	receiverWG.Add(1)
   124  	go func() {
   125  		defer receiverWG.Done()
   126  		if _, err := recvEP.RecvFD(); err == nil {
   127  			t.Error("RecvFD succeeded unexpectedly")
   128  		}
   129  	}()
   130  	defer receiverWG.Wait()
   131  	time.Sleep(time.Second) // to ensure recvEP.RecvFD() has blocked
   132  	recvEP.Shutdown()
   133  }