/usr/share/gocode/src/github.com/docker/libnetwork/cmd/dnet/dnet.go is in golang-github-docker-libnetwork-dev 0.8.0-dev.2+git20170202.599.45b4086-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httptest"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/BurntSushi/toml"
"github.com/codegangsta/cli"
"github.com/docker/docker/opts"
"github.com/docker/docker/pkg/discovery"
"github.com/docker/docker/pkg/reexec"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/api/types/network"
"github.com/docker/docker/pkg/term"
"github.com/docker/libnetwork"
"github.com/docker/libnetwork/api"
"github.com/docker/libnetwork/config"
"github.com/docker/libnetwork/datastore"
"github.com/docker/libnetwork/driverapi"
"github.com/docker/libnetwork/netlabel"
"github.com/docker/libnetwork/netutils"
"github.com/docker/libnetwork/options"
"github.com/docker/libnetwork/types"
"github.com/gorilla/mux"
"golang.org/x/net/context"
)
const (
// DefaultHTTPHost is used if only port is provided to -H flag e.g. docker -d -H tcp://:8080
DefaultHTTPHost = "0.0.0.0"
// DefaultHTTPPort is the default http port used by dnet
DefaultHTTPPort = 2385
// DefaultUnixSocket exported
DefaultUnixSocket = "/var/run/dnet.sock"
cfgFileEnv = "LIBNETWORK_CFG"
defaultCfgFile = "/etc/default/libnetwork.toml"
defaultHeartbeat = time.Duration(10) * time.Second
ttlFactor = 2
)
var epConn *dnetConnection
func main() {
if reexec.Init() {
return
}
_, stdout, stderr := term.StdStreams()
logrus.SetOutput(stderr)
err := dnetApp(stdout, stderr)
if err != nil {
os.Exit(1)
}
}
// ParseConfig parses the libnetwork configuration file
func (d *dnetConnection) parseOrchestrationConfig(tomlCfgFile string) error {
dummy := &dnetConnection{}
if _, err := toml.DecodeFile(tomlCfgFile, dummy); err != nil {
return err
}
if dummy.Orchestration != nil {
d.Orchestration = dummy.Orchestration
}
return nil
}
func (d *dnetConnection) parseConfig(cfgFile string) (*config.Config, error) {
if strings.Trim(cfgFile, " ") == "" {
cfgFile = os.Getenv(cfgFileEnv)
if strings.Trim(cfgFile, " ") == "" {
cfgFile = defaultCfgFile
}
}
if err := d.parseOrchestrationConfig(cfgFile); err != nil {
return nil, err
}
return config.ParseConfig(cfgFile)
}
func processConfig(cfg *config.Config) []config.Option {
options := []config.Option{}
if cfg == nil {
return options
}
dn := "bridge"
if strings.TrimSpace(cfg.Daemon.DefaultNetwork) != "" {
dn = cfg.Daemon.DefaultNetwork
}
options = append(options, config.OptionDefaultNetwork(dn))
dd := "bridge"
if strings.TrimSpace(cfg.Daemon.DefaultDriver) != "" {
dd = cfg.Daemon.DefaultDriver
}
options = append(options, config.OptionDefaultDriver(dd))
if cfg.Daemon.Labels != nil {
options = append(options, config.OptionLabels(cfg.Daemon.Labels))
}
if dcfg, ok := cfg.Scopes[datastore.GlobalScope]; ok && dcfg.IsValid() {
options = append(options, config.OptionKVProvider(dcfg.Client.Provider))
options = append(options, config.OptionKVProviderURL(dcfg.Client.Address))
}
dOptions, err := startDiscovery(&cfg.Cluster)
if err != nil {
logrus.Infof("Skipping discovery : %s", err.Error())
} else {
options = append(options, dOptions...)
}
return options
}
func startDiscovery(cfg *config.ClusterCfg) ([]config.Option, error) {
if cfg == nil {
return nil, fmt.Errorf("discovery requires a valid configuration")
}
hb := time.Duration(cfg.Heartbeat) * time.Second
if hb == 0 {
hb = defaultHeartbeat
}
logrus.Infof("discovery : %s $s", cfg.Discovery, hb.String())
d, err := discovery.New(cfg.Discovery, hb, ttlFactor*hb, map[string]string{})
if err != nil {
return nil, err
}
if cfg.Address == "" {
iface, err := net.InterfaceByName("eth0")
if err != nil {
return nil, err
}
addrs, err := iface.Addrs()
if err != nil || len(addrs) == 0 {
return nil, err
}
ip, _, _ := net.ParseCIDR(addrs[0].String())
cfg.Address = ip.String()
}
if ip := net.ParseIP(cfg.Address); ip == nil {
return nil, errors.New("address config should be either ipv4 or ipv6 address")
}
if err := d.Register(cfg.Address + ":0"); err != nil {
return nil, err
}
options := []config.Option{config.OptionDiscoveryWatcher(d), config.OptionDiscoveryAddress(cfg.Address)}
go func() {
for {
select {
case <-time.After(hb):
if err := d.Register(cfg.Address + ":0"); err != nil {
logrus.Warn(err)
}
}
}
}()
return options, nil
}
func dnetApp(stdout, stderr io.Writer) error {
app := cli.NewApp()
app.Name = "dnet"
app.Usage = "A self-sufficient runtime for container networking."
app.Flags = dnetFlags
app.Before = processFlags
app.Commands = dnetCommands
app.Run(os.Args)
return nil
}
func createDefaultNetwork(c libnetwork.NetworkController) {
nw := c.Config().Daemon.DefaultNetwork
d := c.Config().Daemon.DefaultDriver
createOptions := []libnetwork.NetworkOption{}
genericOption := options.Generic{}
if nw != "" && d != "" {
// Bridge driver is special due to legacy reasons
if d == "bridge" {
genericOption[netlabel.GenericData] = map[string]string{
"BridgeName": "docker0",
"DefaultBridge": "true",
}
createOptions = append(createOptions,
libnetwork.NetworkOptionGeneric(genericOption),
ipamOption(nw))
}
if n, err := c.NetworkByName(nw); err == nil {
logrus.Debugf("Default network %s already present. Deleting it", nw)
if err = n.Delete(); err != nil {
logrus.Debugf("Network could not be deleted: %v", err)
return
}
}
_, err := c.NewNetwork(d, nw, "", createOptions...)
if err != nil {
logrus.Errorf("Error creating default network : %s : %v", nw, err)
}
}
}
type dnetConnection struct {
// proto holds the client protocol i.e. unix.
proto string
// addr holds the client address.
addr string
Orchestration *NetworkOrchestration
configEvent chan struct{}
}
// NetworkOrchestration exported
type NetworkOrchestration struct {
Agent bool
Manager bool
Bind string
Peer string
}
func (d *dnetConnection) dnetDaemon(cfgFile string) error {
if err := startTestDriver(); err != nil {
return fmt.Errorf("failed to start test driver: %v", err)
}
cfg, err := d.parseConfig(cfgFile)
var cOptions []config.Option
if err == nil {
cOptions = processConfig(cfg)
} else {
logrus.Errorf("Error parsing config %v", err)
}
bridgeConfig := options.Generic{
"EnableIPForwarding": true,
"EnableIPTables": true,
}
bridgeOption := options.Generic{netlabel.GenericData: bridgeConfig}
cOptions = append(cOptions, config.OptionDriverConfig("bridge", bridgeOption))
controller, err := libnetwork.New(cOptions...)
if err != nil {
fmt.Println("Error starting dnetDaemon :", err)
return err
}
controller.SetClusterProvider(d)
if d.Orchestration.Agent || d.Orchestration.Manager {
d.configEvent <- struct{}{}
}
createDefaultNetwork(controller)
httpHandler := api.NewHTTPHandler(controller)
r := mux.NewRouter().StrictSlash(false)
post := r.PathPrefix("/{.*}/networks").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/networks").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/{.*}/services").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/services").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/{.*}/sandboxes").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
post = r.PathPrefix("/sandboxes").Subrouter()
post.Methods("GET", "PUT", "POST", "DELETE").HandlerFunc(httpHandler)
handleSignals(controller)
setupDumpStackTrap()
return http.ListenAndServe(d.addr, r)
}
func (d *dnetConnection) IsManager() bool {
return d.Orchestration.Manager
}
func (d *dnetConnection) IsAgent() bool {
return d.Orchestration.Agent
}
func (d *dnetConnection) GetAdvertiseAddress() string {
return d.Orchestration.Bind
}
func (d *dnetConnection) GetLocalAddress() string {
return d.Orchestration.Bind
}
func (d *dnetConnection) GetListenAddress() string {
return d.Orchestration.Bind
}
func (d *dnetConnection) GetRemoteAddress() string {
return d.Orchestration.Peer
}
func (d *dnetConnection) GetNetworkKeys() []*types.EncryptionKey {
return nil
}
func (d *dnetConnection) SetNetworkKeys([]*types.EncryptionKey) {
}
func (d *dnetConnection) ListenClusterEvents() <-chan struct{} {
return d.configEvent
}
func (d *dnetConnection) AttachNetwork(string, string, []string) (*network.NetworkingConfig, error) {
return nil, nil
}
func (d *dnetConnection) DetachNetwork(string, string) error {
return nil
}
func (d *dnetConnection) UpdateAttachment(string, string, *network.NetworkingConfig) error {
return nil
}
func (d *dnetConnection) WaitForDetachment(context.Context, string, string, string, string) error {
return nil
}
func handleSignals(controller libnetwork.NetworkController) {
c := make(chan os.Signal, 1)
signals := []os.Signal{os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT}
signal.Notify(c, signals...)
go func() {
for range c {
controller.Stop()
os.Exit(0)
}
}()
}
func startTestDriver() error {
mux := http.NewServeMux()
server := httptest.NewServer(mux)
if server == nil {
return fmt.Errorf("Failed to start an HTTP Server")
}
mux.HandleFunc("/Plugin.Activate", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, `{"Implements": ["%s"]}`, driverapi.NetworkPluginEndpointType)
})
mux.HandleFunc(fmt.Sprintf("/%s.GetCapabilities", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, `{"Scope":"global"}`)
})
mux.HandleFunc(fmt.Sprintf("/%s.CreateNetwork", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.DeleteNetwork", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.CreateEndpoint", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.DeleteEndpoint", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.Join", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
mux.HandleFunc(fmt.Sprintf("/%s.Leave", driverapi.NetworkPluginEndpointType), func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/vnd.docker.plugins.v1+json")
fmt.Fprintf(w, "null")
})
if err := os.MkdirAll("/etc/docker/plugins", 0755); err != nil {
return err
}
if err := ioutil.WriteFile("/etc/docker/plugins/test.spec", []byte(server.URL), 0644); err != nil {
return err
}
return nil
}
func newDnetConnection(val string) (*dnetConnection, error) {
url, err := opts.ParseHost(false, val)
if err != nil {
return nil, err
}
protoAddrParts := strings.SplitN(url, "://", 2)
if len(protoAddrParts) != 2 {
return nil, fmt.Errorf("bad format, expected tcp://ADDR")
}
if strings.ToLower(protoAddrParts[0]) != "tcp" {
return nil, fmt.Errorf("dnet currently only supports tcp transport")
}
return &dnetConnection{protoAddrParts[0], protoAddrParts[1], &NetworkOrchestration{}, make(chan struct{}, 10)}, nil
}
func (d *dnetConnection) httpCall(method, path string, data interface{}, headers map[string][]string) (io.ReadCloser, http.Header, int, error) {
var in io.Reader
in, err := encodeData(data)
if err != nil {
return nil, nil, -1, err
}
req, err := http.NewRequest(method, fmt.Sprintf("%s", path), in)
if err != nil {
return nil, nil, -1, err
}
setupRequestHeaders(method, data, req, headers)
req.URL.Host = d.addr
req.URL.Scheme = "http"
httpClient := &http.Client{}
resp, err := httpClient.Do(req)
statusCode := -1
if resp != nil {
statusCode = resp.StatusCode
}
if err != nil {
return nil, nil, statusCode, fmt.Errorf("error when trying to connect: %v", err)
}
if statusCode < 200 || statusCode >= 400 {
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, nil, statusCode, err
}
return nil, nil, statusCode, fmt.Errorf("error : %s", bytes.TrimSpace(body))
}
return resp.Body, resp.Header, statusCode, nil
}
func setupRequestHeaders(method string, data interface{}, req *http.Request, headers map[string][]string) {
if data != nil {
if headers == nil {
headers = make(map[string][]string)
}
headers["Content-Type"] = []string{"application/json"}
}
expectedPayload := (method == "POST" || method == "PUT")
if expectedPayload && req.Header.Get("Content-Type") == "" {
req.Header.Set("Content-Type", "text/plain")
}
if headers != nil {
for k, v := range headers {
req.Header[k] = v
}
}
}
func encodeData(data interface{}) (*bytes.Buffer, error) {
params := bytes.NewBuffer(nil)
if data != nil {
if err := json.NewEncoder(params).Encode(data); err != nil {
return nil, err
}
}
return params, nil
}
func ipamOption(bridgeName string) libnetwork.NetworkOption {
if nws, _, err := netutils.ElectInterfaceAddresses(bridgeName); err == nil {
ipamV4Conf := &libnetwork.IpamConf{PreferredPool: nws[0].String()}
hip, _ := types.GetHostPartIP(nws[0].IP, nws[0].Mask)
if hip.IsGlobalUnicast() {
ipamV4Conf.Gateway = nws[0].IP.String()
}
return libnetwork.NetworkOptionIpam("default", "", []*libnetwork.IpamConf{ipamV4Conf}, nil, nil)
}
return nil
}
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