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package container // import "github.com/docker/docker/integration/container"
import (
"bytes"
"context"
"fmt"
"io"
"net"
"strings"
"testing"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/integration/internal/container"
"github.com/docker/go-connections/nat"
"gotest.tools/v3/assert"
is "gotest.tools/v3/assert/cmp"
"gotest.tools/v3/poll"
"gotest.tools/v3/skip"
)
func TestNetworkNat(t *testing.T) {
skip.If(t, testEnv.OSType == "windows", "FIXME")
skip.If(t, testEnv.IsRemoteDaemon)
defer setupTest(t)()
msg := "it works"
startServerContainer(t, msg, 8080)
endpoint := getExternalAddress(t)
conn, err := net.Dial("tcp", net.JoinHostPort(endpoint.String(), "8080"))
assert.NilError(t, err)
defer conn.Close()
data, err := io.ReadAll(conn)
assert.NilError(t, err)
assert.Check(t, is.Equal(msg, strings.TrimSpace(string(data))))
}
func TestNetworkLocalhostTCPNat(t *testing.T) {
skip.If(t, testEnv.IsRemoteDaemon)
defer setupTest(t)()
msg := "hi yall"
startServerContainer(t, msg, 8081)
conn, err := net.Dial("tcp", "localhost:8081")
assert.NilError(t, err)
defer conn.Close()
data, err := io.ReadAll(conn)
assert.NilError(t, err)
assert.Check(t, is.Equal(msg, strings.TrimSpace(string(data))))
}
func TestNetworkLoopbackNat(t *testing.T) {
skip.If(t, testEnv.OSType == "windows", "FIXME")
skip.If(t, testEnv.IsRemoteDaemon)
defer setupTest(t)()
msg := "it works"
serverContainerID := startServerContainer(t, msg, 8080)
endpoint := getExternalAddress(t)
client := testEnv.APIClient()
ctx := context.Background()
cID := container.Run(ctx, t, client,
container.WithCmd("sh", "-c", fmt.Sprintf("stty raw && nc -w 1 %s 8080", endpoint.String())),
container.WithTty(true),
container.WithNetworkMode("container:"+serverContainerID),
)
poll.WaitOn(t, container.IsStopped(ctx, client, cID), poll.WithDelay(100*time.Millisecond))
body, err := client.ContainerLogs(ctx, cID, types.ContainerLogsOptions{
ShowStdout: true,
})
assert.NilError(t, err)
defer body.Close()
var b bytes.Buffer
_, err = io.Copy(&b, body)
assert.NilError(t, err)
assert.Check(t, is.Equal(msg, strings.TrimSpace(b.String())))
}
func startServerContainer(t *testing.T, msg string, port int) string {
t.Helper()
client := testEnv.APIClient()
ctx := context.Background()
cID := container.Run(ctx, t, client,
container.WithName("server-"+t.Name()),
container.WithCmd("sh", "-c", fmt.Sprintf("echo %q | nc -lp %d", msg, port)),
container.WithExposedPorts(fmt.Sprintf("%d/tcp", port)),
func(c *container.TestContainerConfig) {
c.HostConfig.PortBindings = nat.PortMap{
nat.Port(fmt.Sprintf("%d/tcp", port)): []nat.PortBinding{
{
HostPort: fmt.Sprintf("%d", port),
},
},
}
})
poll.WaitOn(t, container.IsInState(ctx, client, cID, "running"), poll.WithDelay(100*time.Millisecond))
return cID
}
// getExternalAddress() returns the external IP-address from eth0. If eth0 has
// multiple IP-addresses, it returns the first IPv4 IP-address; if no IPv4
// address is present, it returns the first IP-address found.
func getExternalAddress(t *testing.T) net.IP {
t.Helper()
iface, err := net.InterfaceByName("eth0")
skip.If(t, err != nil, "Test not running with `make test-integration`. Interface eth0 not found: %s", err)
ifaceAddrs, err := iface.Addrs()
assert.NilError(t, err)
assert.Check(t, 0 != len(ifaceAddrs))
if len(ifaceAddrs) > 1 {
// Prefer IPv4 address if multiple addresses found, as rootlesskit
// does not handle IPv6 currently https://github.com/moby/moby/pull/41908#issuecomment-774200001
for _, a := range ifaceAddrs {
ifaceIP, _, err := net.ParseCIDR(a.String())
assert.NilError(t, err)
if ifaceIP.To4() != nil {
return ifaceIP
}
}
}
ifaceIP, _, err := net.ParseCIDR(ifaceAddrs[0].String())
assert.NilError(t, err)
return ifaceIP
}
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