github.com/docker/Engine@v17.12.1-ce-rc2+incompatible/integration-cli/docker_cli_nat_test.go (about)

     1  package main
     2  
     3  import (
     4  	"fmt"
     5  	"io/ioutil"
     6  	"net"
     7  	"strings"
     8  
     9  	"github.com/docker/docker/integration-cli/checker"
    10  	"github.com/docker/docker/integration-cli/cli"
    11  	"github.com/go-check/check"
    12  )
    13  
    14  func startServerContainer(c *check.C, msg string, port int) string {
    15  	name := "server"
    16  	cmd := []string{
    17  		"run",
    18  		"--name",
    19  		name,
    20  		"-d",
    21  		"-p", fmt.Sprintf("%d:%d", port, port),
    22  		"busybox",
    23  		"sh", "-c", fmt.Sprintf("echo %q | nc -lp %d", msg, port),
    24  	}
    25  	cli.DockerCmd(c, cmd...)
    26  	cli.WaitRun(c, name)
    27  	return name
    28  }
    29  
    30  func getExternalAddress(c *check.C) net.IP {
    31  	iface, err := net.InterfaceByName("eth0")
    32  	if err != nil {
    33  		c.Skip(fmt.Sprintf("Test not running with `make test`. Interface eth0 not found: %v", err))
    34  	}
    35  
    36  	ifaceAddrs, err := iface.Addrs()
    37  	c.Assert(err, check.IsNil)
    38  	c.Assert(ifaceAddrs, checker.Not(checker.HasLen), 0)
    39  
    40  	ifaceIP, _, err := net.ParseCIDR(ifaceAddrs[0].String())
    41  	c.Assert(err, check.IsNil)
    42  
    43  	return ifaceIP
    44  }
    45  
    46  func (s *DockerSuite) TestNetworkNat(c *check.C) {
    47  	testRequires(c, DaemonIsLinux, SameHostDaemon)
    48  	msg := "it works"
    49  	startServerContainer(c, msg, 8080)
    50  	endpoint := getExternalAddress(c)
    51  	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", endpoint.String(), 8080))
    52  	c.Assert(err, check.IsNil)
    53  
    54  	data, err := ioutil.ReadAll(conn)
    55  	conn.Close()
    56  	c.Assert(err, check.IsNil)
    57  
    58  	final := strings.TrimRight(string(data), "\n")
    59  	c.Assert(final, checker.Equals, msg)
    60  }
    61  
    62  func (s *DockerSuite) TestNetworkLocalhostTCPNat(c *check.C) {
    63  	testRequires(c, DaemonIsLinux, SameHostDaemon)
    64  	var (
    65  		msg = "hi yall"
    66  	)
    67  	startServerContainer(c, msg, 8081)
    68  	conn, err := net.Dial("tcp", "localhost:8081")
    69  	c.Assert(err, check.IsNil)
    70  
    71  	data, err := ioutil.ReadAll(conn)
    72  	conn.Close()
    73  	c.Assert(err, check.IsNil)
    74  
    75  	final := strings.TrimRight(string(data), "\n")
    76  	c.Assert(final, checker.Equals, msg)
    77  }
    78  
    79  func (s *DockerSuite) TestNetworkLoopbackNat(c *check.C) {
    80  	testRequires(c, DaemonIsLinux, SameHostDaemon, NotUserNamespace)
    81  	msg := "it works"
    82  	startServerContainer(c, msg, 8080)
    83  	endpoint := getExternalAddress(c)
    84  	out, _ := dockerCmd(c, "run", "-t", "--net=container:server", "busybox",
    85  		"sh", "-c", fmt.Sprintf("stty raw && nc -w 5 %s 8080", endpoint.String()))
    86  	final := strings.TrimRight(string(out), "\n")
    87  	c.Assert(final, checker.Equals, msg)
    88  }