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f42348e18f
The `--userland-proxy` daemon flag makes it possible to rely on hairpin NAT and additional iptables routes instead of userland proxy for port publishing and inter-container communication. Usage of the userland proxy remains the default as hairpin NAT is unsupported by older kernels. Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
103 lines
2.9 KiB
Go
103 lines
2.9 KiB
Go
package main
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import (
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"fmt"
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"net"
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"os/exec"
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"strconv"
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"strings"
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"github.com/go-check/check"
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)
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func startServerContainer(c *check.C, proto string, port int) string {
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cmd := []string{"-d", "-p", fmt.Sprintf("%d:%d", port, port), "busybox", "nc", "-lp", strconv.Itoa(port)}
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if proto == "udp" {
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cmd = append(cmd, "-u")
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}
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name := "server"
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if err := waitForContainer(name, cmd...); err != nil {
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c.Fatalf("Failed to launch server container: %v", err)
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}
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return name
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}
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func getExternalAddress(c *check.C) net.IP {
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iface, err := net.InterfaceByName("eth0")
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if err != nil {
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c.Skip(fmt.Sprintf("Test not running with `make test`. Interface eth0 not found: %v", err))
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}
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ifaceAddrs, err := iface.Addrs()
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if err != nil || len(ifaceAddrs) == 0 {
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c.Fatalf("Error retrieving addresses for eth0: %v (%d addresses)", err, len(ifaceAddrs))
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}
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ifaceIP, _, err := net.ParseCIDR(ifaceAddrs[0].String())
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if err != nil {
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c.Fatalf("Error retrieving the up for eth0: %s", err)
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}
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return ifaceIP
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}
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func getContainerLogs(c *check.C, containerID string) string {
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runCmd := exec.Command(dockerBinary, "logs", containerID)
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out, _, err := runCommandWithOutput(runCmd)
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if err != nil {
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c.Fatal(out, err)
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}
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return strings.Trim(out, "\r\n")
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}
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func getContainerStatus(c *check.C, containerID string) string {
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runCmd := exec.Command(dockerBinary, "inspect", "-f", "{{.State.Running}}", containerID)
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out, _, err := runCommandWithOutput(runCmd)
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if err != nil {
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c.Fatal(out, err)
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}
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return strings.Trim(out, "\r\n")
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}
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func (s *DockerSuite) TestNetworkNat(c *check.C) {
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testRequires(c, SameHostDaemon, NativeExecDriver)
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defer deleteAllContainers()
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srv := startServerContainer(c, "tcp", 8080)
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// Spawn a new container which connects to the server through the
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// interface address.
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endpoint := getExternalAddress(c)
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runCmd := exec.Command(dockerBinary, "run", "busybox", "sh", "-c", fmt.Sprintf("echo hello world | nc -w 30 %s 8080", endpoint))
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if out, _, err := runCommandWithOutput(runCmd); err != nil {
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c.Fatalf("Failed to connect to server: %v (output: %q)", err, string(out))
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}
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result := getContainerLogs(c, srv)
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if expected := "hello world"; result != expected {
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c.Fatalf("Unexpected output. Expected: %q, received: %q", expected, result)
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}
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}
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func (s *DockerSuite) TestNetworkLocalhostTCPNat(c *check.C) {
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testRequires(c, SameHostDaemon, NativeExecDriver)
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defer deleteAllContainers()
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srv := startServerContainer(c, "tcp", 8081)
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// Attempt to connect from the host to the listening container.
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conn, err := net.Dial("tcp", "localhost:8081")
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if err != nil {
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c.Fatalf("Failed to connect to container (%v)", err)
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}
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if _, err := conn.Write([]byte("hello world\n")); err != nil {
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c.Fatal(err)
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}
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conn.Close()
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result := getContainerLogs(c, srv)
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if expected := "hello world"; result != expected {
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c.Fatalf("Unexpected output. Expected: %q, received: %q", expected, result)
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}
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}
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