func (cli *DockerCli) CmdPort(args ...string) error {
cmd := cli.Subcmd("port", "CONTAINER [PRIVATE_PORT[/PROTO]]", "List port mappings for the CONTAINER, or lookup the public-facing port that\nis NAT-ed to the PRIVATE_PORT", true)
cmd.Require(flag.Min, 1)
utils.ParseFlags(cmd, args, true)
stream, _, err := cli.call("GET", "/containers/"+cmd.Arg(0)+"/json", nil, false)
if err != nil {
return err
}
env := engine.Env{}
if err := env.Decode(stream); err != nil {
return err
}
ports := nat.PortMap{}
if err := env.GetSubEnv("NetworkSettings").GetJson("Ports", &ports); err != nil {
return err
}
if cmd.NArg() == 2 {
var (
port = cmd.Arg(1)
proto = "tcp"
parts = strings.SplitN(port, "/", 2)
)
if len(parts) == 2 && len(parts[1]) != 0 {
port = parts[0]
proto = parts[1]
}
natPort := port + "/" + proto
if frontends, exists := ports[nat.Port(port+"/"+proto)]; exists && frontends != nil {
for _, frontend := range frontends {
fmt.Fprintf(cli.out, "%s:%s\n", frontend.HostIp, frontend.HostPort)
}
return nil
}
return fmt.Errorf("Error: No public port '%s' published for %s", natPort, cmd.Arg(0))
}
for from, frontends := range ports {
for _, frontend := range frontends {
fmt.Fprintf(cli.out, "%s -> %s:%s\n", from, frontend.HostIp, frontend.HostPort)
}
}
return nil
}
func LinkContainers(job *engine.Job) engine.Status {
var (
action = job.Args[0]
nfAction iptables.Action
childIP = job.Getenv("ChildIP")
parentIP = job.Getenv("ParentIP")
ignoreErrors = job.GetenvBool("IgnoreErrors")
ports = job.GetenvList("Ports")
)
switch action {
case "-A":
nfAction = iptables.Append
case "-I":
nfAction = iptables.Insert
case "-D":
nfAction = iptables.Delete
default:
return job.Errorf("Invalid action '%s' specified", action)
}
ip1 := net.ParseIP(parentIP)
if ip1 == nil {
return job.Errorf("parent IP '%s' is invalid", parentIP)
}
ip2 := net.ParseIP(childIP)
if ip2 == nil {
return job.Errorf("child IP '%s' is invalid", childIP)
}
chain := iptables.Chain{Name: "DOCKER", Bridge: bridgeIface}
for _, p := range ports {
port := nat.Port(p)
if err := chain.Link(nfAction, ip1, ip2, port.Int(), port.Proto()); !ignoreErrors && err != nil {
return job.Error(err)
}
}
return engine.StatusOK
}
