package main
 
 import (
 	"fmt"

 	"io/ioutil"

 	"net"

 	"strings"

 	"github.com/docker/docker/pkg/integration/checker"

 	"github.com/go-check/check"

 )
 

 func startServerContainer(c *check.C, msg string, port int) string {

 	name := "server"

 	cmd := []string{
 		"-d",
 		"-p", fmt.Sprintf("%d:%d", port, port),
 		"busybox",
 		"sh", "-c", fmt.Sprintf("echo %q | nc -lp %d", msg, port),
 	}

 	c.Assert(waitForContainer(name, cmd...), check.IsNil)

 	return name
 }
 
 func getExternalAddress(c *check.C) net.IP {

 	iface, err := net.InterfaceByName("eth0")
 	if err != nil {

 		c.Skip(fmt.Sprintf("Test not running with `make test`. Interface eth0 not found: %v", err))

 	}
 
 	ifaceAddrs, err := iface.Addrs()

 	c.Assert(err, check.IsNil)
 	c.Assert(ifaceAddrs, checker.Not(checker.HasLen), 0)

 	ifaceIP, _, err := net.ParseCIDR(ifaceAddrs[0].String())

 	c.Assert(err, check.IsNil)

 	return ifaceIP
 }
 
 func getContainerLogs(c *check.C, containerID string) string {

 	out, _ := dockerCmd(c, "logs", containerID)

 	return strings.Trim(out, "\r\n")
 }

 func getContainerStatus(c *check.C, containerID string) string {

 	out, err := inspectField(containerID, "State.Running")
 	c.Assert(err, check.IsNil)
 	return out

 }

 func (s *DockerSuite) TestNetworkNat(c *check.C) {

 	testRequires(c, DaemonIsLinux, SameHostDaemon)

 	msg := "it works"
 	startServerContainer(c, msg, 8080)

 	endpoint := getExternalAddress(c)

 	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", endpoint.String(), 8080))

 	c.Assert(err, check.IsNil)
 

 	data, err := ioutil.ReadAll(conn)
 	conn.Close()

 	c.Assert(err, check.IsNil)
 

 	final := strings.TrimRight(string(data), "\n")

 	c.Assert(final, checker.Equals, msg)

 }
 
 func (s *DockerSuite) TestNetworkLocalhostTCPNat(c *check.C) {

 	testRequires(c, DaemonIsLinux, SameHostDaemon)

 	var (
 		msg = "hi yall"
 	)
 	startServerContainer(c, msg, 8081)

 	conn, err := net.Dial("tcp", "localhost:8081")

 	c.Assert(err, check.IsNil)
 

 	data, err := ioutil.ReadAll(conn)
 	conn.Close()

 	c.Assert(err, check.IsNil)
 

 	final := strings.TrimRight(string(data), "\n")

 	c.Assert(final, checker.Equals, msg)

 }

 
 func (s *DockerSuite) TestNetworkLoopbackNat(c *check.C) {

 	testRequires(c, DaemonIsLinux, SameHostDaemon, NotUserNamespace)

 	msg := "it works"
 	startServerContainer(c, msg, 8080)
 	endpoint := getExternalAddress(c)

 	out, _ := dockerCmd(c, "run", "-t", "--net=container:server", "busybox",

 		"sh", "-c", fmt.Sprintf("stty raw && nc -w 5 %s 8080", endpoint.String()))
 	final := strings.TrimRight(string(out), "\n")

 	c.Assert(final, checker.Equals, msg)

 }