github.com/forest33/wtun@v0.3.1/tun/tun_linux_test.go (about)

     1  package tun
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  	"os/exec"
     7  	"testing"
     8  )
     9  
    10  func TestCreate(t *testing.T) {
    11  	//d, err := CreateTUN("", DefaultMTU, unix.IFF_VNET_HDR)
    12  	d, err := CreateTUN("", DefaultMTU, 0)
    13  	if err != nil {
    14  		t.Fatalf("failed create device: %v", err)
    15  	}
    16  
    17  	if ev := <-d.Events(); ev != EventUp {
    18  		t.Fatal("device in not up")
    19  	}
    20  
    21  	deviceName, err := d.Name()
    22  	if err != nil {
    23  		t.Fatalf("failed to get device name: %v", err)
    24  	}
    25  
    26  	if err := execute(fmt.Sprintf("ip addr add dev %s local 192.168.100.1 remote 192.168.100.2", deviceName)); err != nil {
    27  		t.Fatalf("failed to set interface address: %v", err)
    28  	}
    29  	if err := execute(fmt.Sprintf("ip link set dev %s mtu %d up", deviceName, DefaultMTU)); err != nil {
    30  		t.Fatalf("failed to set interface MTU: %v", err)
    31  	}
    32  
    33  	buf := make([]byte, DefaultMTU)
    34  	nr, err := d.Read(buf)
    35  	if err != nil {
    36  		t.Fatalf("failed reading from device: %v", err)
    37  	}
    38  
    39  	nw, err := d.Write(buf[:nr])
    40  	if err != nil {
    41  		t.Fatalf("failed to write to device: %v", err)
    42  	}
    43  
    44  	if nw != nr {
    45  		t.Fatalf("write failed nw=%d nr=%d", nw, nr)
    46  	}
    47  }
    48  
    49  func execute(command string) error {
    50  	var stdout bytes.Buffer
    51  	var stderr bytes.Buffer
    52  
    53  	cmd := exec.Command("bash", append([]string{"-c"}, command)...)
    54  	cmd.Stdout = &stdout
    55  	cmd.Stderr = &stderr
    56  
    57  	return cmd.Run()
    58  }