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package client
import (
"fmt"
"net"
"sort"
"strings"
"text/tabwriter"
"golang.org/x/net/context"
Cli "github.com/docker/docker/cli"
"github.com/docker/docker/opts"
flag "github.com/docker/docker/pkg/mflag"
"github.com/docker/docker/pkg/stringid"
runconfigopts "github.com/docker/docker/runconfig/opts"
"github.com/docker/engine-api/types"
"github.com/docker/engine-api/types/filters"
"github.com/docker/engine-api/types/network"
)
// CmdNetwork is the parent subcommand for all network commands
//
// Usage: docker network <COMMAND> [OPTIONS]
func (cli *DockerCli) CmdNetwork(args ...string) error {
cmd := Cli.Subcmd("network", []string{"COMMAND [OPTIONS]"}, networkUsage(), false)
cmd.Require(flag.Min, 1)
err := cmd.ParseFlags(args, true)
cmd.Usage()
return err
}
// CmdNetworkCreate creates a new network with a given name
//
// Usage: docker network create [OPTIONS] <NETWORK-NAME>
func (cli *DockerCli) CmdNetworkCreate(args ...string) error {
cmd := Cli.Subcmd("network create", []string{"NETWORK-NAME"}, "Creates a new network with a name specified by the user", false)
flDriver := cmd.String([]string{"d", "-driver"}, "bridge", "Driver to manage the Network")
flOpts := opts.NewMapOpts(nil, nil)
flIpamDriver := cmd.String([]string{"-ipam-driver"}, "default", "IP Address Management Driver")
flIpamSubnet := opts.NewListOpts(nil)
flIpamIPRange := opts.NewListOpts(nil)
flIpamGateway := opts.NewListOpts(nil)
flIpamAux := opts.NewMapOpts(nil, nil)
flIpamOpt := opts.NewMapOpts(nil, nil)
flLabels := opts.NewListOpts(nil)
cmd.Var(&flIpamSubnet, []string{"-subnet"}, "subnet in CIDR format that represents a network segment")
cmd.Var(&flIpamIPRange, []string{"-ip-range"}, "allocate container ip from a sub-range")
cmd.Var(&flIpamGateway, []string{"-gateway"}, "ipv4 or ipv6 Gateway for the master subnet")
cmd.Var(flIpamAux, []string{"-aux-address"}, "auxiliary ipv4 or ipv6 addresses used by Network driver")
cmd.Var(flOpts, []string{"o", "-opt"}, "set driver specific options")
cmd.Var(flIpamOpt, []string{"-ipam-opt"}, "set IPAM driver specific options")
cmd.Var(&flLabels, []string{"-label"}, "set metadata on a network")
flInternal := cmd.Bool([]string{"-internal"}, false, "restricts external access to the network")
flIPv6 := cmd.Bool([]string{"-ipv6"}, false, "enable IPv6 networking")
cmd.Require(flag.Exact, 1)
err := cmd.ParseFlags(args, true)
if err != nil {
return err
}
// Set the default driver to "" if the user didn't set the value.
// That way we can know whether it was user input or not.
driver := *flDriver
if !cmd.IsSet("-driver") && !cmd.IsSet("d") {
driver = ""
}
ipamCfg, err := consolidateIpam(flIpamSubnet.GetAll(), flIpamIPRange.GetAll(), flIpamGateway.GetAll(), flIpamAux.GetAll())
if err != nil {
return err
}
// Construct network create request body
nc := types.NetworkCreate{
Name: cmd.Arg(0),
Driver: driver,
IPAM: network.IPAM{Driver: *flIpamDriver, Config: ipamCfg, Options: flIpamOpt.GetAll()},
Options: flOpts.GetAll(),
CheckDuplicate: true,
Internal: *flInternal,
EnableIPv6: *flIPv6,
Labels: runconfigopts.ConvertKVStringsToMap(flLabels.GetAll()),
}
resp, err := cli.client.NetworkCreate(context.Background(), nc)
if err != nil {
return err
}
fmt.Fprintf(cli.out, "%s\n", resp.ID)
return nil
}
// CmdNetworkRm deletes one or more networks
//
// Usage: docker network rm NETWORK-NAME|NETWORK-ID [NETWORK-NAME|NETWORK-ID...]
func (cli *DockerCli) CmdNetworkRm(args ...string) error {
cmd := Cli.Subcmd("network rm", []string{"NETWORK [NETWORK...]"}, "Deletes one or more networks", false)
cmd.Require(flag.Min, 1)
if err := cmd.ParseFlags(args, true); err != nil {
return err
}
status := 0
for _, net := range cmd.Args() {
if err := cli.client.NetworkRemove(context.Background(), net); err != nil {
fmt.Fprintf(cli.err, "%s\n", err)
status = 1
continue
}
}
if status != 0 {
return Cli.StatusError{StatusCode: status}
}
return nil
}
// CmdNetworkConnect connects a container to a network
//
// Usage: docker network connect [OPTIONS] <NETWORK> <CONTAINER>
func (cli *DockerCli) CmdNetworkConnect(args ...string) error {
cmd := Cli.Subcmd("network connect", []string{"NETWORK CONTAINER"}, "Connects a container to a network", false)
flIPAddress := cmd.String([]string{"-ip"}, "", "IP Address")
flIPv6Address := cmd.String([]string{"-ip6"}, "", "IPv6 Address")
flLinks := opts.NewListOpts(runconfigopts.ValidateLink)
cmd.Var(&flLinks, []string{"-link"}, "Add link to another container")
flAliases := opts.NewListOpts(nil)
cmd.Var(&flAliases, []string{"-alias"}, "Add network-scoped alias for the container")
cmd.Require(flag.Min, 2)
if err := cmd.ParseFlags(args, true); err != nil {
return err
}
epConfig := &network.EndpointSettings{
IPAMConfig: &network.EndpointIPAMConfig{
IPv4Address: *flIPAddress,
IPv6Address: *flIPv6Address,
},
Links: flLinks.GetAll(),
Aliases: flAliases.GetAll(),
}
return cli.client.NetworkConnect(context.Background(), cmd.Arg(0), cmd.Arg(1), epConfig)
}
// CmdNetworkDisconnect disconnects a container from a network
//
// Usage: docker network disconnect <NETWORK> <CONTAINER>
func (cli *DockerCli) CmdNetworkDisconnect(args ...string) error {
cmd := Cli.Subcmd("network disconnect", []string{"NETWORK CONTAINER"}, "Disconnects container from a network", false)
force := cmd.Bool([]string{"f", "-force"}, false, "Force the container to disconnect from a network")
cmd.Require(flag.Exact, 2)
if err := cmd.ParseFlags(args, true); err != nil {
return err
}
return cli.client.NetworkDisconnect(context.Background(), cmd.Arg(0), cmd.Arg(1), *force)
}
// CmdNetworkLs lists all the networks managed by docker daemon
//
// Usage: docker network ls [OPTIONS]
func (cli *DockerCli) CmdNetworkLs(args ...string) error {
cmd := Cli.Subcmd("network ls", nil, "Lists networks", true)
quiet := cmd.Bool([]string{"q", "-quiet"}, false, "Only display numeric IDs")
noTrunc := cmd.Bool([]string{"-no-trunc"}, false, "Do not truncate the output")
flFilter := opts.NewListOpts(nil)
cmd.Var(&flFilter, []string{"f", "-filter"}, "Filter output based on conditions provided")
cmd.Require(flag.Exact, 0)
err := cmd.ParseFlags(args, true)
if err != nil {
return err
}
// Consolidate all filter flags, and sanity check them early.
// They'll get process after get response from server.
netFilterArgs := filters.NewArgs()
for _, f := range flFilter.GetAll() {
if netFilterArgs, err = filters.ParseFlag(f, netFilterArgs); err != nil {
return err
}
}
options := types.NetworkListOptions{
Filters: netFilterArgs,
}
networkResources, err := cli.client.NetworkList(context.Background(), options)
if err != nil {
return err
}
wr := tabwriter.NewWriter(cli.out, 20, 1, 3, ' ', 0)
// unless quiet (-q) is specified, print field titles
if !*quiet {
fmt.Fprintln(wr, "NETWORK ID\tNAME\tDRIVER")
}
sort.Sort(byNetworkName(networkResources))
for _, networkResource := range networkResources {
ID := networkResource.ID
netName := networkResource.Name
if !*noTrunc {
ID = stringid.TruncateID(ID)
}
if *quiet {
fmt.Fprintln(wr, ID)
continue
}
driver := networkResource.Driver
fmt.Fprintf(wr, "%s\t%s\t%s\t",
ID,
netName,
driver)
fmt.Fprint(wr, "\n")
}
wr.Flush()
return nil
}
type byNetworkName []types.NetworkResource
func (r byNetworkName) Len() int { return len(r) }
func (r byNetworkName) Swap(i, j int) { r[i], r[j] = r[j], r[i] }
func (r byNetworkName) Less(i, j int) bool { return r[i].Name < r[j].Name }
// CmdNetworkInspect inspects the network object for more details
//
// Usage: docker network inspect [OPTIONS] <NETWORK> [NETWORK...]
func (cli *DockerCli) CmdNetworkInspect(args ...string) error {
cmd := Cli.Subcmd("network inspect", []string{"NETWORK [NETWORK...]"}, "Displays detailed information on one or more networks", false)
tmplStr := cmd.String([]string{"f", "-format"}, "", "Format the output using the given go template")
cmd.Require(flag.Min, 1)
if err := cmd.ParseFlags(args, true); err != nil {
return err
}
inspectSearcher := func(name string) (interface{}, []byte, error) {
i, err := cli.client.NetworkInspect(context.Background(), name)
return i, nil, err
}
return cli.inspectElements(*tmplStr, cmd.Args(), inspectSearcher)
}
// Consolidates the ipam configuration as a group from different related configurations
// user can configure network with multiple non-overlapping subnets and hence it is
// possible to correlate the various related parameters and consolidate them.
// consoidateIpam consolidates subnets, ip-ranges, gateways and auxiliary addresses into
// structured ipam data.
func consolidateIpam(subnets, ranges, gateways []string, auxaddrs map[string]string) ([]network.IPAMConfig, error) {
if len(subnets) < len(ranges) || len(subnets) < len(gateways) {
return nil, fmt.Errorf("every ip-range or gateway must have a corresponding subnet")
}
iData := map[string]*network.IPAMConfig{}
// Populate non-overlapping subnets into consolidation map
for _, s := range subnets {
for k := range iData {
ok1, err := subnetMatches(s, k)
if err != nil {
return nil, err
}
ok2, err := subnetMatches(k, s)
if err != nil {
return nil, err
}
if ok1 || ok2 {
return nil, fmt.Errorf("multiple overlapping subnet configuration is not supported")
}
}
iData[s] = &network.IPAMConfig{Subnet: s, AuxAddress: map[string]string{}}
}
// Validate and add valid ip ranges
for _, r := range ranges {
match := false
for _, s := range subnets {
ok, err := subnetMatches(s, r)
if err != nil {
return nil, err
}
if !ok {
continue
}
if iData[s].IPRange != "" {
return nil, fmt.Errorf("cannot configure multiple ranges (%s, %s) on the same subnet (%s)", r, iData[s].IPRange, s)
}
d := iData[s]
d.IPRange = r
match = true
}
if !match {
return nil, fmt.Errorf("no matching subnet for range %s", r)
}
}
// Validate and add valid gateways
for _, g := range gateways {
match := false
for _, s := range subnets {
ok, err := subnetMatches(s, g)
if err != nil {
return nil, err
}
if !ok {
continue
}
if iData[s].Gateway != "" {
return nil, fmt.Errorf("cannot configure multiple gateways (%s, %s) for the same subnet (%s)", g, iData[s].Gateway, s)
}
d := iData[s]
d.Gateway = g
match = true
}
if !match {
return nil, fmt.Errorf("no matching subnet for gateway %s", g)
}
}
// Validate and add aux-addresses
for key, aa := range auxaddrs {
match := false
for _, s := range subnets {
ok, err := subnetMatches(s, aa)
if err != nil {
return nil, err
}
if !ok {
continue
}
iData[s].AuxAddress[key] = aa
match = true
}
if !match {
return nil, fmt.Errorf("no matching subnet for aux-address %s", aa)
}
}
idl := []network.IPAMConfig{}
for _, v := range iData {
idl = append(idl, *v)
}
return idl, nil
}
func subnetMatches(subnet, data string) (bool, error) {
var (
ip net.IP
)
_, s, err := net.ParseCIDR(subnet)
if err != nil {
return false, fmt.Errorf("Invalid subnet %s : %v", s, err)
}
if strings.Contains(data, "/") {
ip, _, err = net.ParseCIDR(data)
if err != nil {
return false, fmt.Errorf("Invalid cidr %s : %v", data, err)
}
} else {
ip = net.ParseIP(data)
}
return s.Contains(ip), nil
}
func networkUsage() string {
networkCommands := map[string]string{
"create": "Create a network",
"connect": "Connect container to a network",
"disconnect": "Disconnect container from a network",
"inspect": "Display detailed network information",
"ls": "List all networks",
"rm": "Remove a network",
}
help := "Commands:\n"
for cmd, description := range networkCommands {
help += fmt.Sprintf(" %-25.25s%s\n", cmd, description)
}
help += fmt.Sprintf("\nRun 'docker network COMMAND --help' for more information on a command.")
return help
}