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Signed-off-by: Lantao Liu <lantaol@google.com>
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[![Build Status](https://travis-ci.org/containernetworking/cni.svg?branch=master)](https://travis-ci.org/containernetworking/cni)
[![Coverage Status](https://coveralls.io/repos/github/containernetworking/cni/badge.svg?branch=master)](https://coveralls.io/github/containernetworking/cni?branch=master)
[![Slack Status](https://cryptic-tundra-43194.herokuapp.com/badge.svg)](https://cryptic-tundra-43194.herokuapp.com/)
![CNI Logo](logo.png)
---
# Community Sync Meeting
There is a community sync meeting for users and developers every 1-2 months. The next meeting will help on a Google Hangout and the link is in the [agenda](https://docs.google.com/document/d/10ECyT2mBGewsJUcmYmS8QNo1AcNgy2ZIe2xS7lShYhE/edit?usp=sharing) (Notes from previous meeting are also in this doc). The next meeting will be held on *Wednesday, June 21th* at *3:00pm UTC* [Add to Calendar]https://www.worldtimebuddy.com/?qm=1&lid=100,5,2643743,5391959&h=100&date=2017-6-21&sln=15-16).
---
# CNI - the Container Network Interface
## What is CNI?
CNI (_Container Network Interface_), a [Cloud Native Computing Foundation](https://cncf.io) project, consists of a specification and libraries for writing plugins to configure network interfaces in Linux containers, along with a number of supported plugins.
CNI concerns itself only with network connectivity of containers and removing allocated resources when the container is deleted.
Because of this focus, CNI has a wide range of support and the specification is simple to implement.
As well as the [specification](SPEC.md), this repository contains the Go source code of a [library for integrating CNI into applications](libcni) and an [example command-line tool](cnitool) for executing CNI plugins. A [separate repository contains reference plugins](https://github.com/containernetworking/plugins) and a template for making new plugins.
The template code makes it straight-forward to create a CNI plugin for an existing container networking project.
CNI also makes a good framework for creating a new container networking project from scratch.
## Why develop CNI?
Application containers on Linux are a rapidly evolving area, and within this area networking is not well addressed as it is highly environment-specific.
We believe that many container runtimes and orchestrators will seek to solve the same problem of making the network layer pluggable.
To avoid duplication, we think it is prudent to define a common interface between the network plugins and container execution: hence we put forward this specification, along with libraries for Go and a set of plugins.
## Who is using CNI?
### Container runtimes
- [rkt - container engine](https://coreos.com/blog/rkt-cni-networking.html)
- [Kurma - container runtime](http://kurma.io/)
- [Kubernetes - a system to simplify container operations](http://kubernetes.io/docs/admin/network-plugins/)
- [OpenShift - Kubernetes with additional enterprise features](https://github.com/openshift/origin/blob/master/docs/openshift_networking_requirements.md)
- [Cloud Foundry - a platform for cloud applications](https://github.com/cloudfoundry-incubator/cf-networking-release)
- [Mesos - a distributed systems kernel](https://github.com/apache/mesos/blob/master/docs/cni.md)
### 3rd party plugins
- [Project Calico - a layer 3 virtual network](https://github.com/projectcalico/calico-cni)
- [Weave - a multi-host Docker network](https://github.com/weaveworks/weave)
- [Contiv Networking - policy networking for various use cases](https://github.com/contiv/netplugin)
- [SR-IOV](https://github.com/hustcat/sriov-cni)
- [Cilium - BPF & XDP for containers](https://github.com/cilium/cilium)
- [Infoblox - enterprise IP address management for containers](https://github.com/infobloxopen/cni-infoblox)
- [Multus - a Multi plugin](https://github.com/Intel-Corp/multus-cni)
- [Romana - Layer 3 CNI plugin supporting network policy for Kubernetes](https://github.com/romana/kube)
- [CNI-Genie - generic CNI network plugin](https://github.com/Huawei-PaaS/CNI-Genie)
- [Nuage CNI - Nuage Networks SDN plugin for network policy kubernetes support ](https://github.com/nuagenetworks/nuage-cni)
- [Silk - a CNI plugin designed for Cloud Foundry](https://github.com/cloudfoundry-incubator/silk)
- [Linen - a CNI plugin designed for overlay networks with Open vSwitch and fit in SDN/OpenFlow network environment](https://github.com/John-Lin/linen-cni)
The CNI team also maintains some [core plugins in a separate repository](https://github.com/containernetworking/plugins).
## Contributing to CNI
We welcome contributions, including [bug reports](https://github.com/containernetworking/cni/issues), and code and documentation improvements.
If you intend to contribute to code or documentation, please read [CONTRIBUTING.md](CONTRIBUTING.md). Also see the [contact section](#contact) in this README.
## How do I use CNI?
### Requirements
The CNI spec is language agnostic. To use the Go language libraries in this repository, you'll need a recent version of Go. Our [automated tests](https://travis-ci.org/containernetworking/cni/builds) cover Go versions 1.7 and 1.8.
### Reference Plugins
The CNI project maintains a set of [reference plugins](https://github.com/containernetworking/plugins) that implement the CNI specification.
NOTE: the reference plugins used to live in this repository but have been split out into a [separate repository](https://github.com/containernetworking/plugins) as of May 2017.
### Running the plugins
After building and installing the [reference plugins](https://github.com/containernetworking/plugins), you can use the `priv-net-run.sh` and `docker-run.sh` scripts in the `scripts/` directory to exercise the plugins.
**note - priv-net-run.sh depends on `jq`**
Start out by creating a netconf file to describe a network:
```bash
$ mkdir -p /etc/cni/net.d
$ cat >/etc/cni/net.d/10-mynet.conf <<EOF
{
"cniVersion": "0.2.0",
"name": "mynet",
"type": "bridge",
"bridge": "cni0",
"isGateway": true,
"ipMasq": true,
"ipam": {
"type": "host-local",
"subnet": "10.22.0.0/16",
"routes": [
{ "dst": "0.0.0.0/0" }
]
}
}
EOF
$ cat >/etc/cni/net.d/99-loopback.conf <<EOF
{
"cniVersion": "0.2.0",
"type": "loopback"
}
EOF
```
The directory `/etc/cni/net.d` is the default location in which the scripts will look for net configurations.
Next, build the plugins:
```bash
$ cd $GOPATH/src/github.com/containernetworking/plugins
$ ./build.sh
```
Finally, execute a command (`ifconfig` in this example) in a private network namespace that has joined the `mynet` network:
```bash
$ CNI_PATH=$GOPATH/src/github.com/containernetworking/plugins/bin
$ cd $GOPATH/src/github.com/containernetworking/cni/scripts
$ sudo CNI_PATH=$CNI_PATH ./priv-net-run.sh ifconfig
eth0 Link encap:Ethernet HWaddr f2:c2:6f:54:b8:2b
inet addr:10.22.0.2 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::f0c2:6fff:fe54:b82b/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:90 (90.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
```
The environment variable `CNI_PATH` tells the scripts and library where to look for plugin executables.
## Running a Docker container with network namespace set up by CNI plugins
Use the instructions in the previous section to define a netconf and build the plugins.
Next, docker-run.sh script wraps `docker run`, to execute the plugins prior to entering the container:
```bash
$ CNI_PATH=$GOPATH/src/github.com/containernetworking/plugins/bin
$ cd $GOPATH/src/github.com/containernetworking/cni/scripts
$ sudo CNI_PATH=$CNI_PATH ./docker-run.sh --rm busybox:latest ifconfig
eth0 Link encap:Ethernet HWaddr fa:60:70:aa:07:d1
inet addr:10.22.0.2 Bcast:0.0.0.0 Mask:255.255.0.0
inet6 addr: fe80::f860:70ff:feaa:7d1/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:1 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:1 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:90 (90.0 B) TX bytes:0 (0.0 B)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
```
## What might CNI do in the future?
CNI currently covers a wide range of needs for network configuration due to it simple model and API.
However, in the future CNI might want to branch out into other directions:
- Dynamic updates to existing network configuration
- Dynamic policies for network bandwidth and firewall rules
If these topics of are interest, please contact the team via the mailing list or IRC and find some like-minded people in the community to put a proposal together.
## Contact
For any questions about CNI, please reach out on the mailing list:
- Email: [cni-dev](https://groups.google.com/forum/#!forum/cni-dev)
- IRC: #[containernetworking](irc://irc.freenode.org:6667/#containernetworking) channel on freenode.org
- Slack: [containernetworking.slack.com](https://cryptic-tundra-43194.herokuapp.com)

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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package libcni
import (
"os"
"strings"
"github.com/containernetworking/cni/pkg/invoke"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/version"
)
type RuntimeConf struct {
ContainerID string
NetNS string
IfName string
Args [][2]string
// A dictionary of capability-specific data passed by the runtime
// to plugins as top-level keys in the 'runtimeConfig' dictionary
// of the plugin's stdin data. libcni will ensure that only keys
// in this map which match the capabilities of the plugin are passed
// to the plugin
CapabilityArgs map[string]interface{}
}
type NetworkConfig struct {
Network *types.NetConf
Bytes []byte
}
type NetworkConfigList struct {
Name string
CNIVersion string
Plugins []*NetworkConfig
Bytes []byte
}
type CNI interface {
AddNetworkList(net *NetworkConfigList, rt *RuntimeConf) (types.Result, error)
DelNetworkList(net *NetworkConfigList, rt *RuntimeConf) error
AddNetwork(net *NetworkConfig, rt *RuntimeConf) (types.Result, error)
DelNetwork(net *NetworkConfig, rt *RuntimeConf) error
}
type CNIConfig struct {
Path []string
}
// CNIConfig implements the CNI interface
var _ CNI = &CNIConfig{}
func buildOneConfig(list *NetworkConfigList, orig *NetworkConfig, prevResult types.Result, rt *RuntimeConf) (*NetworkConfig, error) {
var err error
inject := map[string]interface{}{
"name": list.Name,
"cniVersion": list.CNIVersion,
}
// Add previous plugin result
if prevResult != nil {
inject["prevResult"] = prevResult
}
// Ensure every config uses the same name and version
orig, err = InjectConf(orig, inject)
if err != nil {
return nil, err
}
return injectRuntimeConfig(orig, rt)
}
// This function takes a libcni RuntimeConf structure and injects values into
// a "runtimeConfig" dictionary in the CNI network configuration JSON that
// will be passed to the plugin on stdin.
//
// Only "capabilities arguments" passed by the runtime are currently injected.
// These capabilities arguments are filtered through the plugin's advertised
// capabilities from its config JSON, and any keys in the CapabilityArgs
// matching plugin capabilities are added to the "runtimeConfig" dictionary
// sent to the plugin via JSON on stdin. For exmaple, if the plugin's
// capabilities include "portMappings", and the CapabilityArgs map includes a
// "portMappings" key, that key and its value are added to the "runtimeConfig"
// dictionary to be passed to the plugin's stdin.
func injectRuntimeConfig(orig *NetworkConfig, rt *RuntimeConf) (*NetworkConfig, error) {
var err error
rc := make(map[string]interface{})
for capability, supported := range orig.Network.Capabilities {
if !supported {
continue
}
if data, ok := rt.CapabilityArgs[capability]; ok {
rc[capability] = data
}
}
if len(rc) > 0 {
orig, err = InjectConf(orig, map[string]interface{}{"runtimeConfig": rc})
if err != nil {
return nil, err
}
}
return orig, nil
}
// AddNetworkList executes a sequence of plugins with the ADD command
func (c *CNIConfig) AddNetworkList(list *NetworkConfigList, rt *RuntimeConf) (types.Result, error) {
var prevResult types.Result
for _, net := range list.Plugins {
pluginPath, err := invoke.FindInPath(net.Network.Type, c.Path)
if err != nil {
return nil, err
}
newConf, err := buildOneConfig(list, net, prevResult, rt)
if err != nil {
return nil, err
}
prevResult, err = invoke.ExecPluginWithResult(pluginPath, newConf.Bytes, c.args("ADD", rt))
if err != nil {
return nil, err
}
}
return prevResult, nil
}
// DelNetworkList executes a sequence of plugins with the DEL command
func (c *CNIConfig) DelNetworkList(list *NetworkConfigList, rt *RuntimeConf) error {
for i := len(list.Plugins) - 1; i >= 0; i-- {
net := list.Plugins[i]
pluginPath, err := invoke.FindInPath(net.Network.Type, c.Path)
if err != nil {
return err
}
newConf, err := buildOneConfig(list, net, nil, rt)
if err != nil {
return err
}
if err := invoke.ExecPluginWithoutResult(pluginPath, newConf.Bytes, c.args("DEL", rt)); err != nil {
return err
}
}
return nil
}
// AddNetwork executes the plugin with the ADD command
func (c *CNIConfig) AddNetwork(net *NetworkConfig, rt *RuntimeConf) (types.Result, error) {
pluginPath, err := invoke.FindInPath(net.Network.Type, c.Path)
if err != nil {
return nil, err
}
net, err = injectRuntimeConfig(net, rt)
if err != nil {
return nil, err
}
return invoke.ExecPluginWithResult(pluginPath, net.Bytes, c.args("ADD", rt))
}
// DelNetwork executes the plugin with the DEL command
func (c *CNIConfig) DelNetwork(net *NetworkConfig, rt *RuntimeConf) error {
pluginPath, err := invoke.FindInPath(net.Network.Type, c.Path)
if err != nil {
return err
}
net, err = injectRuntimeConfig(net, rt)
if err != nil {
return err
}
return invoke.ExecPluginWithoutResult(pluginPath, net.Bytes, c.args("DEL", rt))
}
// GetVersionInfo reports which versions of the CNI spec are supported by
// the given plugin.
func (c *CNIConfig) GetVersionInfo(pluginType string) (version.PluginInfo, error) {
pluginPath, err := invoke.FindInPath(pluginType, c.Path)
if err != nil {
return nil, err
}
return invoke.GetVersionInfo(pluginPath)
}
// =====
func (c *CNIConfig) args(action string, rt *RuntimeConf) *invoke.Args {
return &invoke.Args{
Command: action,
ContainerID: rt.ContainerID,
NetNS: rt.NetNS,
PluginArgs: rt.Args,
IfName: rt.IfName,
Path: strings.Join(c.Path, string(os.PathListSeparator)),
}
}

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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package libcni
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
)
type NotFoundError struct {
Dir string
Name string
}
func (e NotFoundError) Error() string {
return fmt.Sprintf(`no net configuration with name "%s" in %s`, e.Name, e.Dir)
}
type NoConfigsFoundError struct {
Dir string
}
func (e NoConfigsFoundError) Error() string {
return fmt.Sprintf(`no net configurations found in %s`, e.Dir)
}
func ConfFromBytes(bytes []byte) (*NetworkConfig, error) {
conf := &NetworkConfig{Bytes: bytes}
if err := json.Unmarshal(bytes, &conf.Network); err != nil {
return nil, fmt.Errorf("error parsing configuration: %s", err)
}
return conf, nil
}
func ConfFromFile(filename string) (*NetworkConfig, error) {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("error reading %s: %s", filename, err)
}
return ConfFromBytes(bytes)
}
func ConfListFromBytes(bytes []byte) (*NetworkConfigList, error) {
rawList := make(map[string]interface{})
if err := json.Unmarshal(bytes, &rawList); err != nil {
return nil, fmt.Errorf("error parsing configuration list: %s", err)
}
rawName, ok := rawList["name"]
if !ok {
return nil, fmt.Errorf("error parsing configuration list: no name")
}
name, ok := rawName.(string)
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid name type %T", rawName)
}
var cniVersion string
rawVersion, ok := rawList["cniVersion"]
if ok {
cniVersion, ok = rawVersion.(string)
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid cniVersion type %T", rawVersion)
}
}
list := &NetworkConfigList{
Name: name,
CNIVersion: cniVersion,
Bytes: bytes,
}
var plugins []interface{}
plug, ok := rawList["plugins"]
if !ok {
return nil, fmt.Errorf("error parsing configuration list: no 'plugins' key")
}
plugins, ok = plug.([]interface{})
if !ok {
return nil, fmt.Errorf("error parsing configuration list: invalid 'plugins' type %T", plug)
}
if len(plugins) == 0 {
return nil, fmt.Errorf("error parsing configuration list: no plugins in list")
}
for i, conf := range plugins {
newBytes, err := json.Marshal(conf)
if err != nil {
return nil, fmt.Errorf("Failed to marshal plugin config %d: %v", i, err)
}
netConf, err := ConfFromBytes(newBytes)
if err != nil {
return nil, fmt.Errorf("Failed to parse plugin config %d: %v", i, err)
}
list.Plugins = append(list.Plugins, netConf)
}
return list, nil
}
func ConfListFromFile(filename string) (*NetworkConfigList, error) {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
return nil, fmt.Errorf("error reading %s: %s", filename, err)
}
return ConfListFromBytes(bytes)
}
func ConfFiles(dir string, extensions []string) ([]string, error) {
// In part, adapted from rkt/networking/podenv.go#listFiles
files, err := ioutil.ReadDir(dir)
switch {
case err == nil: // break
case os.IsNotExist(err):
return nil, nil
default:
return nil, err
}
confFiles := []string{}
for _, f := range files {
if f.IsDir() {
continue
}
fileExt := filepath.Ext(f.Name())
for _, ext := range extensions {
if fileExt == ext {
confFiles = append(confFiles, filepath.Join(dir, f.Name()))
}
}
}
return confFiles, nil
}
func LoadConf(dir, name string) (*NetworkConfig, error) {
files, err := ConfFiles(dir, []string{".conf", ".json"})
switch {
case err != nil:
return nil, err
case len(files) == 0:
return nil, NoConfigsFoundError{Dir: dir}
}
sort.Strings(files)
for _, confFile := range files {
conf, err := ConfFromFile(confFile)
if err != nil {
return nil, err
}
if conf.Network.Name == name {
return conf, nil
}
}
return nil, NotFoundError{dir, name}
}
func LoadConfList(dir, name string) (*NetworkConfigList, error) {
files, err := ConfFiles(dir, []string{".conflist"})
if err != nil {
return nil, err
}
sort.Strings(files)
for _, confFile := range files {
conf, err := ConfListFromFile(confFile)
if err != nil {
return nil, err
}
if conf.Name == name {
return conf, nil
}
}
// Try and load a network configuration file (instead of list)
// from the same name, then upconvert.
singleConf, err := LoadConf(dir, name)
if err != nil {
// A little extra logic so the error makes sense
if _, ok := err.(NoConfigsFoundError); len(files) != 0 && ok {
// Config lists found but no config files found
return nil, NotFoundError{dir, name}
}
return nil, err
}
return ConfListFromConf(singleConf)
}
func InjectConf(original *NetworkConfig, newValues map[string]interface{}) (*NetworkConfig, error) {
config := make(map[string]interface{})
err := json.Unmarshal(original.Bytes, &config)
if err != nil {
return nil, fmt.Errorf("unmarshal existing network bytes: %s", err)
}
for key, value := range newValues {
if key == "" {
return nil, fmt.Errorf("keys cannot be empty")
}
if value == nil {
return nil, fmt.Errorf("key '%s' value must not be nil", key)
}
config[key] = value
}
newBytes, err := json.Marshal(config)
if err != nil {
return nil, err
}
return ConfFromBytes(newBytes)
}
// ConfListFromConf "upconverts" a network config in to a NetworkConfigList,
// with the single network as the only entry in the list.
func ConfListFromConf(original *NetworkConfig) (*NetworkConfigList, error) {
// Re-deserialize the config's json, then make a raw map configlist.
// This may seem a bit strange, but it's to make the Bytes fields
// actually make sense. Otherwise, the generated json is littered with
// golang default values.
rawConfig := make(map[string]interface{})
if err := json.Unmarshal(original.Bytes, &rawConfig); err != nil {
return nil, err
}
rawConfigList := map[string]interface{}{
"name": original.Network.Name,
"cniVersion": original.Network.CNIVersion,
"plugins": []interface{}{rawConfig},
}
b, err := json.Marshal(rawConfigList)
if err != nil {
return nil, err
}
return ConfListFromBytes(b)
}

82
vendor/github.com/containernetworking/cni/pkg/invoke/args.go generated vendored Normal file
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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
import (
"os"
"strings"
)
type CNIArgs interface {
// For use with os/exec; i.e., return nil to inherit the
// environment from this process
AsEnv() []string
}
type inherited struct{}
var inheritArgsFromEnv inherited
func (_ *inherited) AsEnv() []string {
return nil
}
func ArgsFromEnv() CNIArgs {
return &inheritArgsFromEnv
}
type Args struct {
Command string
ContainerID string
NetNS string
PluginArgs [][2]string
PluginArgsStr string
IfName string
Path string
}
// Args implements the CNIArgs interface
var _ CNIArgs = &Args{}
func (args *Args) AsEnv() []string {
env := os.Environ()
pluginArgsStr := args.PluginArgsStr
if pluginArgsStr == "" {
pluginArgsStr = stringify(args.PluginArgs)
}
// Ensure that the custom values are first, so any value present in
// the process environment won't override them.
env = append([]string{
"CNI_COMMAND=" + args.Command,
"CNI_CONTAINERID=" + args.ContainerID,
"CNI_NETNS=" + args.NetNS,
"CNI_ARGS=" + pluginArgsStr,
"CNI_IFNAME=" + args.IfName,
"CNI_PATH=" + args.Path,
}, env...)
return env
}
// taken from rkt/networking/net_plugin.go
func stringify(pluginArgs [][2]string) string {
entries := make([]string, len(pluginArgs))
for i, kv := range pluginArgs {
entries[i] = strings.Join(kv[:], "=")
}
return strings.Join(entries, ";")
}

53
vendor/github.com/containernetworking/cni/pkg/invoke/delegate.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
import (
"fmt"
"os"
"path/filepath"
"github.com/containernetworking/cni/pkg/types"
)
func DelegateAdd(delegatePlugin string, netconf []byte) (types.Result, error) {
if os.Getenv("CNI_COMMAND") != "ADD" {
return nil, fmt.Errorf("CNI_COMMAND is not ADD")
}
paths := filepath.SplitList(os.Getenv("CNI_PATH"))
pluginPath, err := FindInPath(delegatePlugin, paths)
if err != nil {
return nil, err
}
return ExecPluginWithResult(pluginPath, netconf, ArgsFromEnv())
}
func DelegateDel(delegatePlugin string, netconf []byte) error {
if os.Getenv("CNI_COMMAND") != "DEL" {
return fmt.Errorf("CNI_COMMAND is not DEL")
}
paths := filepath.SplitList(os.Getenv("CNI_PATH"))
pluginPath, err := FindInPath(delegatePlugin, paths)
if err != nil {
return err
}
return ExecPluginWithoutResult(pluginPath, netconf, ArgsFromEnv())
}

95
vendor/github.com/containernetworking/cni/pkg/invoke/exec.go generated vendored Normal file
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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
import (
"fmt"
"os"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/version"
)
func ExecPluginWithResult(pluginPath string, netconf []byte, args CNIArgs) (types.Result, error) {
return defaultPluginExec.WithResult(pluginPath, netconf, args)
}
func ExecPluginWithoutResult(pluginPath string, netconf []byte, args CNIArgs) error {
return defaultPluginExec.WithoutResult(pluginPath, netconf, args)
}
func GetVersionInfo(pluginPath string) (version.PluginInfo, error) {
return defaultPluginExec.GetVersionInfo(pluginPath)
}
var defaultPluginExec = &PluginExec{
RawExec: &RawExec{Stderr: os.Stderr},
VersionDecoder: &version.PluginDecoder{},
}
type PluginExec struct {
RawExec interface {
ExecPlugin(pluginPath string, stdinData []byte, environ []string) ([]byte, error)
}
VersionDecoder interface {
Decode(jsonBytes []byte) (version.PluginInfo, error)
}
}
func (e *PluginExec) WithResult(pluginPath string, netconf []byte, args CNIArgs) (types.Result, error) {
stdoutBytes, err := e.RawExec.ExecPlugin(pluginPath, netconf, args.AsEnv())
if err != nil {
return nil, err
}
// Plugin must return result in same version as specified in netconf
versionDecoder := &version.ConfigDecoder{}
confVersion, err := versionDecoder.Decode(netconf)
if err != nil {
return nil, err
}
return version.NewResult(confVersion, stdoutBytes)
}
func (e *PluginExec) WithoutResult(pluginPath string, netconf []byte, args CNIArgs) error {
_, err := e.RawExec.ExecPlugin(pluginPath, netconf, args.AsEnv())
return err
}
// GetVersionInfo returns the version information available about the plugin.
// For recent-enough plugins, it uses the information returned by the VERSION
// command. For older plugins which do not recognize that command, it reports
// version 0.1.0
func (e *PluginExec) GetVersionInfo(pluginPath string) (version.PluginInfo, error) {
args := &Args{
Command: "VERSION",
// set fake values required by plugins built against an older version of skel
NetNS: "dummy",
IfName: "dummy",
Path: "dummy",
}
stdin := []byte(fmt.Sprintf(`{"cniVersion":%q}`, version.Current()))
stdoutBytes, err := e.RawExec.ExecPlugin(pluginPath, stdin, args.AsEnv())
if err != nil {
if err.Error() == "unknown CNI_COMMAND: VERSION" {
return version.PluginSupports("0.1.0"), nil
}
return nil, err
}
return e.VersionDecoder.Decode(stdoutBytes)
}

43
vendor/github.com/containernetworking/cni/pkg/invoke/find.go generated vendored Normal file
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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
import (
"fmt"
"os"
"path/filepath"
)
// FindInPath returns the full path of the plugin by searching in the provided path
func FindInPath(plugin string, paths []string) (string, error) {
if plugin == "" {
return "", fmt.Errorf("no plugin name provided")
}
if len(paths) == 0 {
return "", fmt.Errorf("no paths provided")
}
for _, path := range paths {
for _, fe := range ExecutableFileExtensions {
fullpath := filepath.Join(path, plugin) + fe
if fi, err := os.Stat(fullpath); err == nil && fi.Mode().IsRegular() {
return fullpath, nil
}
}
}
return "", fmt.Errorf("failed to find plugin %q in path %s", plugin, paths)
}

20
vendor/github.com/containernetworking/cni/pkg/invoke/os_unix.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin dragonfly freebsd linux netbsd opensbd solaris
package invoke
// Valid file extensions for plugin executables.
var ExecutableFileExtensions = []string{""}

18
vendor/github.com/containernetworking/cni/pkg/invoke/os_windows.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
// Valid file extensions for plugin executables.
var ExecutableFileExtensions = []string{".exe", ""}

59
vendor/github.com/containernetworking/cni/pkg/invoke/raw_exec.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package invoke
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os/exec"
"github.com/containernetworking/cni/pkg/types"
)
type RawExec struct {
Stderr io.Writer
}
func (e *RawExec) ExecPlugin(pluginPath string, stdinData []byte, environ []string) ([]byte, error) {
stdout := &bytes.Buffer{}
c := exec.Cmd{
Env: environ,
Path: pluginPath,
Args: []string{pluginPath},
Stdin: bytes.NewBuffer(stdinData),
Stdout: stdout,
Stderr: e.Stderr,
}
if err := c.Run(); err != nil {
return nil, pluginErr(err, stdout.Bytes())
}
return stdout.Bytes(), nil
}
func pluginErr(err error, output []byte) error {
if _, ok := err.(*exec.ExitError); ok {
emsg := types.Error{}
if perr := json.Unmarshal(output, &emsg); perr != nil {
emsg.Msg = fmt.Sprintf("netplugin failed but error parsing its diagnostic message %q: %v", string(output), perr)
}
return &emsg
}
return err
}

135
vendor/github.com/containernetworking/cni/pkg/types/020/types.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types020
import (
"encoding/json"
"fmt"
"net"
"os"
"github.com/containernetworking/cni/pkg/types"
)
const ImplementedSpecVersion string = "0.2.0"
var SupportedVersions = []string{"", "0.1.0", ImplementedSpecVersion}
// Compatibility types for CNI version 0.1.0 and 0.2.0
func NewResult(data []byte) (types.Result, error) {
result := &Result{}
if err := json.Unmarshal(data, result); err != nil {
return nil, err
}
return result, nil
}
func GetResult(r types.Result) (*Result, error) {
// We expect version 0.1.0/0.2.0 results
result020, err := r.GetAsVersion(ImplementedSpecVersion)
if err != nil {
return nil, err
}
result, ok := result020.(*Result)
if !ok {
return nil, fmt.Errorf("failed to convert result")
}
return result, nil
}
// Result is what gets returned from the plugin (via stdout) to the caller
type Result struct {
CNIVersion string `json:"cniVersion,omitempty"`
IP4 *IPConfig `json:"ip4,omitempty"`
IP6 *IPConfig `json:"ip6,omitempty"`
DNS types.DNS `json:"dns,omitempty"`
}
func (r *Result) Version() string {
return ImplementedSpecVersion
}
func (r *Result) GetAsVersion(version string) (types.Result, error) {
for _, supportedVersion := range SupportedVersions {
if version == supportedVersion {
r.CNIVersion = version
return r, nil
}
}
return nil, fmt.Errorf("cannot convert version %q to %s", SupportedVersions, version)
}
func (r *Result) Print() error {
data, err := json.MarshalIndent(r, "", " ")
if err != nil {
return err
}
_, err = os.Stdout.Write(data)
return err
}
// String returns a formatted string in the form of "[IP4: $1,][ IP6: $2,] DNS: $3" where
// $1 represents the receiver's IPv4, $2 represents the receiver's IPv6 and $3 the
// receiver's DNS. If $1 or $2 are nil, they won't be present in the returned string.
func (r *Result) String() string {
var str string
if r.IP4 != nil {
str = fmt.Sprintf("IP4:%+v, ", *r.IP4)
}
if r.IP6 != nil {
str += fmt.Sprintf("IP6:%+v, ", *r.IP6)
}
return fmt.Sprintf("%sDNS:%+v", str, r.DNS)
}
// IPConfig contains values necessary to configure an interface
type IPConfig struct {
IP net.IPNet
Gateway net.IP
Routes []types.Route
}
// net.IPNet is not JSON (un)marshallable so this duality is needed
// for our custom IPNet type
// JSON (un)marshallable types
type ipConfig struct {
IP types.IPNet `json:"ip"`
Gateway net.IP `json:"gateway,omitempty"`
Routes []types.Route `json:"routes,omitempty"`
}
func (c *IPConfig) MarshalJSON() ([]byte, error) {
ipc := ipConfig{
IP: types.IPNet(c.IP),
Gateway: c.Gateway,
Routes: c.Routes,
}
return json.Marshal(ipc)
}
func (c *IPConfig) UnmarshalJSON(data []byte) error {
ipc := ipConfig{}
if err := json.Unmarshal(data, &ipc); err != nil {
return err
}
c.IP = net.IPNet(ipc.IP)
c.Gateway = ipc.Gateway
c.Routes = ipc.Routes
return nil
}

112
vendor/github.com/containernetworking/cni/pkg/types/args.go generated vendored Normal file
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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"encoding"
"fmt"
"reflect"
"strings"
)
// UnmarshallableBool typedef for builtin bool
// because builtin type's methods can't be declared
type UnmarshallableBool bool
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// Returns boolean true if the string is "1" or "[Tt]rue"
// Returns boolean false if the string is "0" or "[Ff]alse"
func (b *UnmarshallableBool) UnmarshalText(data []byte) error {
s := strings.ToLower(string(data))
switch s {
case "1", "true":
*b = true
case "0", "false":
*b = false
default:
return fmt.Errorf("Boolean unmarshal error: invalid input %s", s)
}
return nil
}
// UnmarshallableString typedef for builtin string
type UnmarshallableString string
// UnmarshalText implements the encoding.TextUnmarshaler interface.
// Returns the string
func (s *UnmarshallableString) UnmarshalText(data []byte) error {
*s = UnmarshallableString(data)
return nil
}
// CommonArgs contains the IgnoreUnknown argument
// and must be embedded by all Arg structs
type CommonArgs struct {
IgnoreUnknown UnmarshallableBool `json:"ignoreunknown,omitempty"`
}
// GetKeyField is a helper function to receive Values
// Values that represent a pointer to a struct
func GetKeyField(keyString string, v reflect.Value) reflect.Value {
return v.Elem().FieldByName(keyString)
}
// UnmarshalableArgsError is used to indicate error unmarshalling args
// from the args-string in the form "K=V;K2=V2;..."
type UnmarshalableArgsError struct {
error
}
// LoadArgs parses args from a string in the form "K=V;K2=V2;..."
func LoadArgs(args string, container interface{}) error {
if args == "" {
return nil
}
containerValue := reflect.ValueOf(container)
pairs := strings.Split(args, ";")
unknownArgs := []string{}
for _, pair := range pairs {
kv := strings.Split(pair, "=")
if len(kv) != 2 {
return fmt.Errorf("ARGS: invalid pair %q", pair)
}
keyString := kv[0]
valueString := kv[1]
keyField := GetKeyField(keyString, containerValue)
if !keyField.IsValid() {
unknownArgs = append(unknownArgs, pair)
continue
}
keyFieldIface := keyField.Addr().Interface()
u, ok := keyFieldIface.(encoding.TextUnmarshaler)
if !ok {
return UnmarshalableArgsError{fmt.Errorf(
"ARGS: cannot unmarshal into field '%s' - type '%s' does not implement encoding.TextUnmarshaler",
keyString, reflect.TypeOf(keyFieldIface))}
}
err := u.UnmarshalText([]byte(valueString))
if err != nil {
return fmt.Errorf("ARGS: error parsing value of pair %q: %v)", pair, err)
}
}
isIgnoreUnknown := GetKeyField("IgnoreUnknown", containerValue).Bool()
if len(unknownArgs) > 0 && !isIgnoreUnknown {
return fmt.Errorf("ARGS: unknown args %q", unknownArgs)
}
return nil
}

300
vendor/github.com/containernetworking/cni/pkg/types/current/types.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package current
import (
"encoding/json"
"fmt"
"net"
"os"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/020"
)
const ImplementedSpecVersion string = "0.3.1"
var SupportedVersions = []string{"0.3.0", ImplementedSpecVersion}
func NewResult(data []byte) (types.Result, error) {
result := &Result{}
if err := json.Unmarshal(data, result); err != nil {
return nil, err
}
return result, nil
}
func GetResult(r types.Result) (*Result, error) {
resultCurrent, err := r.GetAsVersion(ImplementedSpecVersion)
if err != nil {
return nil, err
}
result, ok := resultCurrent.(*Result)
if !ok {
return nil, fmt.Errorf("failed to convert result")
}
return result, nil
}
var resultConverters = []struct {
versions []string
convert func(types.Result) (*Result, error)
}{
{types020.SupportedVersions, convertFrom020},
{SupportedVersions, convertFrom030},
}
func convertFrom020(result types.Result) (*Result, error) {
oldResult, err := types020.GetResult(result)
if err != nil {
return nil, err
}
newResult := &Result{
CNIVersion: ImplementedSpecVersion,
DNS: oldResult.DNS,
Routes: []*types.Route{},
}
if oldResult.IP4 != nil {
newResult.IPs = append(newResult.IPs, &IPConfig{
Version: "4",
Address: oldResult.IP4.IP,
Gateway: oldResult.IP4.Gateway,
})
for _, route := range oldResult.IP4.Routes {
gw := route.GW
if gw == nil {
gw = oldResult.IP4.Gateway
}
newResult.Routes = append(newResult.Routes, &types.Route{
Dst: route.Dst,
GW: gw,
})
}
}
if oldResult.IP6 != nil {
newResult.IPs = append(newResult.IPs, &IPConfig{
Version: "6",
Address: oldResult.IP6.IP,
Gateway: oldResult.IP6.Gateway,
})
for _, route := range oldResult.IP6.Routes {
gw := route.GW
if gw == nil {
gw = oldResult.IP6.Gateway
}
newResult.Routes = append(newResult.Routes, &types.Route{
Dst: route.Dst,
GW: gw,
})
}
}
if len(newResult.IPs) == 0 {
return nil, fmt.Errorf("cannot convert: no valid IP addresses")
}
return newResult, nil
}
func convertFrom030(result types.Result) (*Result, error) {
newResult, ok := result.(*Result)
if !ok {
return nil, fmt.Errorf("failed to convert result")
}
newResult.CNIVersion = ImplementedSpecVersion
return newResult, nil
}
func NewResultFromResult(result types.Result) (*Result, error) {
version := result.Version()
for _, converter := range resultConverters {
for _, supportedVersion := range converter.versions {
if version == supportedVersion {
return converter.convert(result)
}
}
}
return nil, fmt.Errorf("unsupported CNI result22 version %q", version)
}
// Result is what gets returned from the plugin (via stdout) to the caller
type Result struct {
CNIVersion string `json:"cniVersion,omitempty"`
Interfaces []*Interface `json:"interfaces,omitempty"`
IPs []*IPConfig `json:"ips,omitempty"`
Routes []*types.Route `json:"routes,omitempty"`
DNS types.DNS `json:"dns,omitempty"`
}
// Convert to the older 0.2.0 CNI spec Result type
func (r *Result) convertTo020() (*types020.Result, error) {
oldResult := &types020.Result{
CNIVersion: types020.ImplementedSpecVersion,
DNS: r.DNS,
}
for _, ip := range r.IPs {
// Only convert the first IP address of each version as 0.2.0
// and earlier cannot handle multiple IP addresses
if ip.Version == "4" && oldResult.IP4 == nil {
oldResult.IP4 = &types020.IPConfig{
IP: ip.Address,
Gateway: ip.Gateway,
}
} else if ip.Version == "6" && oldResult.IP6 == nil {
oldResult.IP6 = &types020.IPConfig{
IP: ip.Address,
Gateway: ip.Gateway,
}
}
if oldResult.IP4 != nil && oldResult.IP6 != nil {
break
}
}
for _, route := range r.Routes {
is4 := route.Dst.IP.To4() != nil
if is4 && oldResult.IP4 != nil {
oldResult.IP4.Routes = append(oldResult.IP4.Routes, types.Route{
Dst: route.Dst,
GW: route.GW,
})
} else if !is4 && oldResult.IP6 != nil {
oldResult.IP6.Routes = append(oldResult.IP6.Routes, types.Route{
Dst: route.Dst,
GW: route.GW,
})
}
}
if oldResult.IP4 == nil && oldResult.IP6 == nil {
return nil, fmt.Errorf("cannot convert: no valid IP addresses")
}
return oldResult, nil
}
func (r *Result) Version() string {
return ImplementedSpecVersion
}
func (r *Result) GetAsVersion(version string) (types.Result, error) {
switch version {
case "0.3.0", ImplementedSpecVersion:
r.CNIVersion = version
return r, nil
case types020.SupportedVersions[0], types020.SupportedVersions[1], types020.SupportedVersions[2]:
return r.convertTo020()
}
return nil, fmt.Errorf("cannot convert version 0.3.x to %q", version)
}
func (r *Result) Print() error {
data, err := json.MarshalIndent(r, "", " ")
if err != nil {
return err
}
_, err = os.Stdout.Write(data)
return err
}
// String returns a formatted string in the form of "[Interfaces: $1,][ IP: $2,] DNS: $3" where
// $1 represents the receiver's Interfaces, $2 represents the receiver's IP addresses and $3 the
// receiver's DNS. If $1 or $2 are nil, they won't be present in the returned string.
func (r *Result) String() string {
var str string
if len(r.Interfaces) > 0 {
str += fmt.Sprintf("Interfaces:%+v, ", r.Interfaces)
}
if len(r.IPs) > 0 {
str += fmt.Sprintf("IP:%+v, ", r.IPs)
}
if len(r.Routes) > 0 {
str += fmt.Sprintf("Routes:%+v, ", r.Routes)
}
return fmt.Sprintf("%sDNS:%+v", str, r.DNS)
}
// Convert this old version result to the current CNI version result
func (r *Result) Convert() (*Result, error) {
return r, nil
}
// Interface contains values about the created interfaces
type Interface struct {
Name string `json:"name"`
Mac string `json:"mac,omitempty"`
Sandbox string `json:"sandbox,omitempty"`
}
func (i *Interface) String() string {
return fmt.Sprintf("%+v", *i)
}
// Int returns a pointer to the int value passed in. Used to
// set the IPConfig.Interface field.
func Int(v int) *int {
return &v
}
// IPConfig contains values necessary to configure an IP address on an interface
type IPConfig struct {
// IP version, either "4" or "6"
Version string
// Index into Result structs Interfaces list
Interface *int
Address net.IPNet
Gateway net.IP
}
func (i *IPConfig) String() string {
return fmt.Sprintf("%+v", *i)
}
// JSON (un)marshallable types
type ipConfig struct {
Version string `json:"version"`
Interface *int `json:"interface,omitempty"`
Address types.IPNet `json:"address"`
Gateway net.IP `json:"gateway,omitempty"`
}
func (c *IPConfig) MarshalJSON() ([]byte, error) {
ipc := ipConfig{
Version: c.Version,
Interface: c.Interface,
Address: types.IPNet(c.Address),
Gateway: c.Gateway,
}
return json.Marshal(ipc)
}
func (c *IPConfig) UnmarshalJSON(data []byte) error {
ipc := ipConfig{}
if err := json.Unmarshal(data, &ipc); err != nil {
return err
}
c.Version = ipc.Version
c.Interface = ipc.Interface
c.Address = net.IPNet(ipc.Address)
c.Gateway = ipc.Gateway
return nil
}

189
vendor/github.com/containernetworking/cni/pkg/types/types.go generated vendored Normal file
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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"encoding/json"
"errors"
"fmt"
"net"
"os"
)
// like net.IPNet but adds JSON marshalling and unmarshalling
type IPNet net.IPNet
// ParseCIDR takes a string like "10.2.3.1/24" and
// return IPNet with "10.2.3.1" and /24 mask
func ParseCIDR(s string) (*net.IPNet, error) {
ip, ipn, err := net.ParseCIDR(s)
if err != nil {
return nil, err
}
ipn.IP = ip
return ipn, nil
}
func (n IPNet) MarshalJSON() ([]byte, error) {
return json.Marshal((*net.IPNet)(&n).String())
}
func (n *IPNet) UnmarshalJSON(data []byte) error {
var s string
if err := json.Unmarshal(data, &s); err != nil {
return err
}
tmp, err := ParseCIDR(s)
if err != nil {
return err
}
*n = IPNet(*tmp)
return nil
}
// NetConf describes a network.
type NetConf struct {
CNIVersion string `json:"cniVersion,omitempty"`
Name string `json:"name,omitempty"`
Type string `json:"type,omitempty"`
Capabilities map[string]bool `json:"capabilities,omitempty"`
IPAM struct {
Type string `json:"type,omitempty"`
} `json:"ipam,omitempty"`
DNS DNS `json:"dns"`
}
// NetConfList describes an ordered list of networks.
type NetConfList struct {
CNIVersion string `json:"cniVersion,omitempty"`
Name string `json:"name,omitempty"`
Plugins []*NetConf `json:"plugins,omitempty"`
}
type ResultFactoryFunc func([]byte) (Result, error)
// Result is an interface that provides the result of plugin execution
type Result interface {
// The highest CNI specification result verison the result supports
// without having to convert
Version() string
// Returns the result converted into the requested CNI specification
// result version, or an error if conversion failed
GetAsVersion(version string) (Result, error)
// Prints the result in JSON format to stdout
Print() error
// Returns a JSON string representation of the result
String() string
}
func PrintResult(result Result, version string) error {
newResult, err := result.GetAsVersion(version)
if err != nil {
return err
}
return newResult.Print()
}
// DNS contains values interesting for DNS resolvers
type DNS struct {
Nameservers []string `json:"nameservers,omitempty"`
Domain string `json:"domain,omitempty"`
Search []string `json:"search,omitempty"`
Options []string `json:"options,omitempty"`
}
type Route struct {
Dst net.IPNet
GW net.IP
}
func (r *Route) String() string {
return fmt.Sprintf("%+v", *r)
}
// Well known error codes
// see https://github.com/containernetworking/cni/blob/master/SPEC.md#well-known-error-codes
const (
ErrUnknown uint = iota // 0
ErrIncompatibleCNIVersion // 1
ErrUnsupportedField // 2
)
type Error struct {
Code uint `json:"code"`
Msg string `json:"msg"`
Details string `json:"details,omitempty"`
}
func (e *Error) Error() string {
details := ""
if e.Details != "" {
details = fmt.Sprintf("; %v", e.Details)
}
return fmt.Sprintf("%v%v", e.Msg, details)
}
func (e *Error) Print() error {
return prettyPrint(e)
}
// net.IPNet is not JSON (un)marshallable so this duality is needed
// for our custom IPNet type
// JSON (un)marshallable types
type route struct {
Dst IPNet `json:"dst"`
GW net.IP `json:"gw,omitempty"`
}
func (r *Route) UnmarshalJSON(data []byte) error {
rt := route{}
if err := json.Unmarshal(data, &rt); err != nil {
return err
}
r.Dst = net.IPNet(rt.Dst)
r.GW = rt.GW
return nil
}
func (r *Route) MarshalJSON() ([]byte, error) {
rt := route{
Dst: IPNet(r.Dst),
GW: r.GW,
}
return json.Marshal(rt)
}
func prettyPrint(obj interface{}) error {
data, err := json.MarshalIndent(obj, "", " ")
if err != nil {
return err
}
_, err = os.Stdout.Write(data)
return err
}
// NotImplementedError is used to indicate that a method is not implemented for the given platform
var NotImplementedError = errors.New("Not Implemented")

37
vendor/github.com/containernetworking/cni/pkg/version/conf.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package version
import (
"encoding/json"
"fmt"
)
// ConfigDecoder can decode the CNI version available in network config data
type ConfigDecoder struct{}
func (*ConfigDecoder) Decode(jsonBytes []byte) (string, error) {
var conf struct {
CNIVersion string `json:"cniVersion"`
}
err := json.Unmarshal(jsonBytes, &conf)
if err != nil {
return "", fmt.Errorf("decoding version from network config: %s", err)
}
if conf.CNIVersion == "" {
return "0.1.0", nil
}
return conf.CNIVersion, nil
}

81
vendor/github.com/containernetworking/cni/pkg/version/plugin.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package version
import (
"encoding/json"
"fmt"
"io"
)
// PluginInfo reports information about CNI versioning
type PluginInfo interface {
// SupportedVersions returns one or more CNI spec versions that the plugin
// supports. If input is provided in one of these versions, then the plugin
// promises to use the same CNI version in its response
SupportedVersions() []string
// Encode writes this CNI version information as JSON to the given Writer
Encode(io.Writer) error
}
type pluginInfo struct {
CNIVersion_ string `json:"cniVersion"`
SupportedVersions_ []string `json:"supportedVersions,omitempty"`
}
// pluginInfo implements the PluginInfo interface
var _ PluginInfo = &pluginInfo{}
func (p *pluginInfo) Encode(w io.Writer) error {
return json.NewEncoder(w).Encode(p)
}
func (p *pluginInfo) SupportedVersions() []string {
return p.SupportedVersions_
}
// PluginSupports returns a new PluginInfo that will report the given versions
// as supported
func PluginSupports(supportedVersions ...string) PluginInfo {
if len(supportedVersions) < 1 {
panic("programmer error: you must support at least one version")
}
return &pluginInfo{
CNIVersion_: Current(),
SupportedVersions_: supportedVersions,
}
}
// PluginDecoder can decode the response returned by a plugin's VERSION command
type PluginDecoder struct{}
func (*PluginDecoder) Decode(jsonBytes []byte) (PluginInfo, error) {
var info pluginInfo
err := json.Unmarshal(jsonBytes, &info)
if err != nil {
return nil, fmt.Errorf("decoding version info: %s", err)
}
if info.CNIVersion_ == "" {
return nil, fmt.Errorf("decoding version info: missing field cniVersion")
}
if len(info.SupportedVersions_) == 0 {
if info.CNIVersion_ == "0.2.0" {
return PluginSupports("0.1.0", "0.2.0"), nil
}
return nil, fmt.Errorf("decoding version info: missing field supportedVersions")
}
return &info, nil
}

49
vendor/github.com/containernetworking/cni/pkg/version/reconcile.go generated vendored Normal file
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// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package version
import "fmt"
type ErrorIncompatible struct {
Config string
Supported []string
}
func (e *ErrorIncompatible) Details() string {
return fmt.Sprintf("config is %q, plugin supports %q", e.Config, e.Supported)
}
func (e *ErrorIncompatible) Error() string {
return fmt.Sprintf("incompatible CNI versions: %s", e.Details())
}
type Reconciler struct{}
func (r *Reconciler) Check(configVersion string, pluginInfo PluginInfo) *ErrorIncompatible {
return r.CheckRaw(configVersion, pluginInfo.SupportedVersions())
}
func (*Reconciler) CheckRaw(configVersion string, supportedVersions []string) *ErrorIncompatible {
for _, supportedVersion := range supportedVersions {
if configVersion == supportedVersion {
return nil
}
}
return &ErrorIncompatible{
Config: configVersion,
Supported: supportedVersions,
}
}

61
vendor/github.com/containernetworking/cni/pkg/version/version.go generated vendored Normal file
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@@ -0,0 +1,61 @@
// Copyright 2016 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package version
import (
"fmt"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/020"
"github.com/containernetworking/cni/pkg/types/current"
)
// Current reports the version of the CNI spec implemented by this library
func Current() string {
return "0.3.1"
}
// Legacy PluginInfo describes a plugin that is backwards compatible with the
// CNI spec version 0.1.0. In particular, a runtime compiled against the 0.1.0
// library ought to work correctly with a plugin that reports support for
// Legacy versions.
//
// Any future CNI spec versions which meet this definition should be added to
// this list.
var Legacy = PluginSupports("0.1.0", "0.2.0")
var All = PluginSupports("0.1.0", "0.2.0", "0.3.0", "0.3.1")
var resultFactories = []struct {
supportedVersions []string
newResult types.ResultFactoryFunc
}{
{current.SupportedVersions, current.NewResult},
{types020.SupportedVersions, types020.NewResult},
}
// Finds a Result object matching the requested version (if any) and asks
// that object to parse the plugin result, returning an error if parsing failed.
func NewResult(version string, resultBytes []byte) (types.Result, error) {
reconciler := &Reconciler{}
for _, resultFactory := range resultFactories {
err := reconciler.CheckRaw(version, resultFactory.supportedVersions)
if err == nil {
// Result supports this version
return resultFactory.newResult(resultBytes)
}
}
return nil, fmt.Errorf("unsupported CNI result version %q", version)
}

201
vendor/github.com/containernetworking/plugins/LICENSE generated vendored Normal file
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@@ -0,0 +1,201 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
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(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
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or a Contribution incorporated within the Work constitutes direct
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as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
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wherever such third-party notices normally appear. The contents
of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
notices within Derivative Works that You distribute, alongside
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as modifying the License.
You may add Your own copyright statement to Your modifications and
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for any such Derivative Works as a whole, provided Your use,
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the conditions stated in this License.
5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
by You to the Licensor shall be under the terms and conditions of
this License, without any additional terms or conditions.
Notwithstanding the above, nothing herein shall supersede or modify
the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
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7. Disclaimer of Warranty. Unless required by applicable law or
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8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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incidental, or consequential damages of any character arising as a
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the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
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boilerplate notice, with the fields enclosed by brackets "{}"
replaced with your own identifying information. (Don't include
the brackets!) The text should be enclosed in the appropriate
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Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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limitations under the License.

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[![Build Status](https://travis-ci.org/containernetworking/plugins.svg?branch=master)](https://travis-ci.org/containernetworking/plugins)
# plugins
Some CNI network plugins, maintained by the containernetworking team. For more information, see the individual READMEs.
## Plugins supplied:
### Main: interface-creating
* `bridge`: Creates a bridge, adds the host and the container to it.
* `ipvlan`: Adds an [ipvlan](https://www.kernel.org/doc/Documentation/networking/ipvlan.txt) interface in the container
* `loopback`: Creates a loopback interface
* `macvlan`: Creates a new MAC address, forwards all traffic to that to the container
* `ptp`: Creates a veth pair.
* `vlan`: Allocates a vlan device.
### IPAM: IP address allocation
* `dhcp`: Runs a daemon on the host to make DHCP requests on behalf of the container
* `host-local`: maintains a local database of allocated IPs
### Meta: other plugins
* `flannel`: generates an interface corresponding to a flannel config file
* `tuning`: Tweaks sysctl parameters of an existing interface
* `portmap`: An iptables-based portmapping plugin. Maps ports from the host's address space to the container.
### Sample
The sample plugin provides an example for building your own plugin.

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### Namespaces, Threads, and Go
On Linux each OS thread can have a different network namespace. Go's thread scheduling model switches goroutines between OS threads based on OS thread load and whether the goroutine would block other goroutines. This can result in a goroutine switching network namespaces without notice and lead to errors in your code.
### Namespace Switching
Switching namespaces with the `ns.Set()` method is not recommended without additional strategies to prevent unexpected namespace changes when your goroutines switch OS threads.
Go provides the `runtime.LockOSThread()` function to ensure a specific goroutine executes on its current OS thread and prevents any other goroutine from running in that thread until the locked one exits. Careful usage of `LockOSThread()` and goroutines can provide good control over which network namespace a given goroutine executes in.
For example, you cannot rely on the `ns.Set()` namespace being the current namespace after the `Set()` call unless you do two things. First, the goroutine calling `Set()` must have previously called `LockOSThread()`. Second, you must ensure `runtime.UnlockOSThread()` is not called somewhere in-between. You also cannot rely on the initial network namespace remaining the current network namespace if any other code in your program switches namespaces, unless you have already called `LockOSThread()` in that goroutine. Note that `LockOSThread()` prevents the Go scheduler from optimally scheduling goroutines for best performance, so `LockOSThread()` should only be used in small, isolated goroutines that release the lock quickly.
### Do() The Recommended Thing
The `ns.Do()` method provides **partial** control over network namespaces for you by implementing these strategies. All code dependent on a particular network namespace (including the root namespace) should be wrapped in the `ns.Do()` method to ensure the correct namespace is selected for the duration of your code. For example:
```go
targetNs, err := ns.NewNS()
if err != nil {
return err
}
err = targetNs.Do(func(hostNs ns.NetNS) error {
dummy := &netlink.Dummy{
LinkAttrs: netlink.LinkAttrs{
Name: "dummy0",
},
}
return netlink.LinkAdd(dummy)
})
```
Note this requirement to wrap every network call is very onerous - any libraries you call might call out to network services such as DNS, and all such calls need to be protected after you call `ns.Do()`. The CNI plugins all exit very soon after calling `ns.Do()` which helps to minimize the problem.
Also: If the runtime spawns a new OS thread, it will inherit the network namespace of the parent thread, which may have been temporarily switched, and thus the new OS thread will be permanently "stuck in the wrong namespace".
In short, **there is no safe way to change network namespaces from within a long-lived, multithreaded Go process**. If your daemon process needs to be namespace aware, consider spawning a separate process (like a CNI plugin) for each namespace.
### Further Reading
- https://github.com/golang/go/wiki/LockOSThread
- http://morsmachine.dk/go-scheduler
- https://github.com/containernetworking/cni/issues/262
- https://golang.org/pkg/runtime/
- https://www.weave.works/blog/linux-namespaces-and-go-don-t-mix

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// Copyright 2015 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ns
import (
"fmt"
"os"
"runtime"
"sync"
"syscall"
)
type NetNS interface {
// Executes the passed closure in this object's network namespace,
// attempting to restore the original namespace before returning.
// However, since each OS thread can have a different network namespace,
// and Go's thread scheduling is highly variable, callers cannot
// guarantee any specific namespace is set unless operations that
// require that namespace are wrapped with Do(). Also, no code called
// from Do() should call runtime.UnlockOSThread(), or the risk
// of executing code in an incorrect namespace will be greater. See
// https://github.com/golang/go/wiki/LockOSThread for further details.
Do(toRun func(NetNS) error) error
// Sets the current network namespace to this object's network namespace.
// Note that since Go's thread scheduling is highly variable, callers
// cannot guarantee the requested namespace will be the current namespace
// after this function is called; to ensure this wrap operations that
// require the namespace with Do() instead.
Set() error
// Returns the filesystem path representing this object's network namespace
Path() string
// Returns a file descriptor representing this object's network namespace
Fd() uintptr
// Cleans up this instance of the network namespace; if this instance
// is the last user the namespace will be destroyed
Close() error
}
type netNS struct {
file *os.File
mounted bool
closed bool
}
// netNS implements the NetNS interface
var _ NetNS = &netNS{}
const (
// https://github.com/torvalds/linux/blob/master/include/uapi/linux/magic.h
NSFS_MAGIC = 0x6e736673
PROCFS_MAGIC = 0x9fa0
)
type NSPathNotExistErr struct{ msg string }
func (e NSPathNotExistErr) Error() string { return e.msg }
type NSPathNotNSErr struct{ msg string }
func (e NSPathNotNSErr) Error() string { return e.msg }
func IsNSorErr(nspath string) error {
stat := syscall.Statfs_t{}
if err := syscall.Statfs(nspath, &stat); err != nil {
if os.IsNotExist(err) {
err = NSPathNotExistErr{msg: fmt.Sprintf("failed to Statfs %q: %v", nspath, err)}
} else {
err = fmt.Errorf("failed to Statfs %q: %v", nspath, err)
}
return err
}
switch stat.Type {
case PROCFS_MAGIC, NSFS_MAGIC:
return nil
default:
return NSPathNotNSErr{msg: fmt.Sprintf("unknown FS magic on %q: %x", nspath, stat.Type)}
}
}
// Returns an object representing the namespace referred to by @path
func GetNS(nspath string) (NetNS, error) {
err := IsNSorErr(nspath)
if err != nil {
return nil, err
}
fd, err := os.Open(nspath)
if err != nil {
return nil, err
}
return &netNS{file: fd}, nil
}
func (ns *netNS) Path() string {
return ns.file.Name()
}
func (ns *netNS) Fd() uintptr {
return ns.file.Fd()
}
func (ns *netNS) errorIfClosed() error {
if ns.closed {
return fmt.Errorf("%q has already been closed", ns.file.Name())
}
return nil
}
func (ns *netNS) Do(toRun func(NetNS) error) error {
if err := ns.errorIfClosed(); err != nil {
return err
}
containedCall := func(hostNS NetNS) error {
threadNS, err := GetCurrentNS()
if err != nil {
return fmt.Errorf("failed to open current netns: %v", err)
}
defer threadNS.Close()
// switch to target namespace
if err = ns.Set(); err != nil {
return fmt.Errorf("error switching to ns %v: %v", ns.file.Name(), err)
}
defer threadNS.Set() // switch back
return toRun(hostNS)
}
// save a handle to current network namespace
hostNS, err := GetCurrentNS()
if err != nil {
return fmt.Errorf("Failed to open current namespace: %v", err)
}
defer hostNS.Close()
var wg sync.WaitGroup
wg.Add(1)
var innerError error
go func() {
defer wg.Done()
runtime.LockOSThread()
innerError = containedCall(hostNS)
}()
wg.Wait()
return innerError
}
// WithNetNSPath executes the passed closure under the given network
// namespace, restoring the original namespace afterwards.
func WithNetNSPath(nspath string, toRun func(NetNS) error) error {
ns, err := GetNS(nspath)
if err != nil {
return err
}
defer ns.Close()
return ns.Do(toRun)
}

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// Copyright 2015-2017 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ns
import (
"crypto/rand"
"fmt"
"os"
"path"
"runtime"
"sync"
"golang.org/x/sys/unix"
)
// Returns an object representing the current OS thread's network namespace
func GetCurrentNS() (NetNS, error) {
return GetNS(getCurrentThreadNetNSPath())
}
func getCurrentThreadNetNSPath() string {
// /proc/self/ns/net returns the namespace of the main thread, not
// of whatever thread this goroutine is running on. Make sure we
// use the thread's net namespace since the thread is switching around
return fmt.Sprintf("/proc/%d/task/%d/ns/net", os.Getpid(), unix.Gettid())
}
// Creates a new persistent network namespace and returns an object
// representing that namespace, without switching to it
func NewNS() (NetNS, error) {
const nsRunDir = "/var/run/netns"
b := make([]byte, 16)
_, err := rand.Reader.Read(b)
if err != nil {
return nil, fmt.Errorf("failed to generate random netns name: %v", err)
}
err = os.MkdirAll(nsRunDir, 0755)
if err != nil {
return nil, err
}
// create an empty file at the mount point
nsName := fmt.Sprintf("cni-%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:])
nsPath := path.Join(nsRunDir, nsName)
mountPointFd, err := os.Create(nsPath)
if err != nil {
return nil, err
}
mountPointFd.Close()
// Ensure the mount point is cleaned up on errors; if the namespace
// was successfully mounted this will have no effect because the file
// is in-use
defer os.RemoveAll(nsPath)
var wg sync.WaitGroup
wg.Add(1)
// do namespace work in a dedicated goroutine, so that we can safely
// Lock/Unlock OSThread without upsetting the lock/unlock state of
// the caller of this function
var fd *os.File
go (func() {
defer wg.Done()
runtime.LockOSThread()
var origNS NetNS
origNS, err = GetNS(getCurrentThreadNetNSPath())
if err != nil {
return
}
defer origNS.Close()
// create a new netns on the current thread
err = unix.Unshare(unix.CLONE_NEWNET)
if err != nil {
return
}
defer origNS.Set()
// bind mount the new netns from the current thread onto the mount point
err = unix.Mount(getCurrentThreadNetNSPath(), nsPath, "none", unix.MS_BIND, "")
if err != nil {
return
}
fd, err = os.Open(nsPath)
if err != nil {
return
}
})()
wg.Wait()
if err != nil {
unix.Unmount(nsPath, unix.MNT_DETACH)
return nil, fmt.Errorf("failed to create namespace: %v", err)
}
return &netNS{file: fd, mounted: true}, nil
}
func (ns *netNS) Close() error {
if err := ns.errorIfClosed(); err != nil {
return err
}
if err := ns.file.Close(); err != nil {
return fmt.Errorf("Failed to close %q: %v", ns.file.Name(), err)
}
ns.closed = true
if ns.mounted {
if err := unix.Unmount(ns.file.Name(), unix.MNT_DETACH); err != nil {
return fmt.Errorf("Failed to unmount namespace %s: %v", ns.file.Name(), err)
}
if err := os.RemoveAll(ns.file.Name()); err != nil {
return fmt.Errorf("Failed to clean up namespace %s: %v", ns.file.Name(), err)
}
ns.mounted = false
}
return nil
}
func (ns *netNS) Set() error {
if err := ns.errorIfClosed(); err != nil {
return err
}
if err := unix.Setns(int(ns.Fd()), unix.CLONE_NEWNET); err != nil {
return fmt.Errorf("Error switching to ns %v: %v", ns.file.Name(), err)
}
return nil
}

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// Copyright 2015-2017 CNI authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build !linux
package ns
import "github.com/containernetworking/cni/pkg/types"
// Returns an object representing the current OS thread's network namespace
func GetCurrentNS() (NetNS, error) {
return nil, types.NotImplementedError
}
func NewNS() (NetNS, error) {
return nil, types.NotImplementedError
}
func (ns *netNS) Close() error {
return types.NotImplementedError
}
func (ns *netNS) Set() error {
return types.NotImplementedError
}