Add plugin code
This adds basic plugins. "main" types: veth, bridge, macvlan "ipam" type: host-local The code has been ported over from github.com/coreos/rkt project and adapted to fit the CNI spec.
This commit is contained in:
Eugene Yakubovich
136
plugin/ipam.go
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136
plugin/ipam.go
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// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package plugin
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/appc/cni/Godeps/_workspace/src/github.com/vishvananda/netlink"
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"github.com/appc/cni/pkg/ip"
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)
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// Find returns the full path of the plugin by searching in CNI_PATH
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func Find(plugin string) string {
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paths := strings.Split(os.Getenv("CNI_PATH"), ":")
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for _, p := range paths {
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fullname := filepath.Join(p, plugin)
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if fi, err := os.Stat(fullname); err == nil && fi.Mode().IsRegular() {
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return fullname
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}
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}
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return ""
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}
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// ExecAdd executes IPAM plugin, assuming CNI_COMMAND == ADD.
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// Parses and returns resulting IPConfig
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func ExecAdd(plugin string, netconf []byte) (*Result, error) {
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if os.Getenv("CNI_COMMAND") != "ADD" {
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return nil, fmt.Errorf("CNI_COMMAND is not ADD")
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}
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pluginPath := Find(plugin)
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if pluginPath == "" {
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return nil, fmt.Errorf("could not find %q plugin", plugin)
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}
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stdout := &bytes.Buffer{}
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c := exec.Cmd{
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Path: pluginPath,
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Args: []string{pluginPath},
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Stdin: bytes.NewBuffer(netconf),
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Stdout: stdout,
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Stderr: os.Stderr,
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}
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if err := c.Run(); err != nil {
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return nil, err
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}
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res := &Result{}
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err := json.Unmarshal(stdout.Bytes(), res)
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return res, err
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}
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// ExecDel executes IPAM plugin, assuming CNI_COMMAND == DEL.
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func ExecDel(plugin string, netconf []byte) error {
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if os.Getenv("CNI_COMMAND") != "DEL" {
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return fmt.Errorf("CNI_COMMAND is not DEL")
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}
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pluginPath := Find(plugin)
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if pluginPath == "" {
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return fmt.Errorf("could not find %q plugin", plugin)
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}
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c := exec.Cmd{
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Path: pluginPath,
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Args: []string{pluginPath},
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Stdin: bytes.NewBuffer(netconf),
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Stderr: os.Stderr,
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}
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return c.Run()
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}
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// ConfigureIface takes the result of IPAM plugin and
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// applies to the ifName interface
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func ConfigureIface(ifName string, res *Result) error {
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link, err := netlink.LinkByName(ifName)
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if err != nil {
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return fmt.Errorf("failed to lookup %q: %v", ifName, err)
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}
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if err := netlink.LinkSetUp(link); err != nil {
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return fmt.Errorf("failed too set %q UP: %v", ifName, err)
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}
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// TODO(eyakubovich): IPv6
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addr := &netlink.Addr{IPNet: &res.IP4.IP, Label: ""}
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if err = netlink.AddrAdd(link, addr); err != nil {
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return fmt.Errorf("failed to add IP addr to %q: %v", ifName, err)
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}
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for _, r := range res.IP4.Routes {
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gw := r.GW
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if gw == nil {
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gw = res.IP4.Gateway
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}
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if err = ip.AddRoute(&r.Dst, gw, link); err != nil {
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// we skip over duplicate routes as we assume the first one wins
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if !os.IsExist(err) {
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return fmt.Errorf("failed to add route '%v via %v dev %v': %v", r.Dst, gw, ifName, err)
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}
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}
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}
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return nil
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}
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// PrintResult writes out prettified Result to stdout
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func PrintResult(res *Result) error {
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data, err := json.MarshalIndent(res, "", " ")
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if err != nil {
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return err
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}
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_, err = os.Stdout.Write(data)
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return err
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}
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106
plugin/types.go
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106
plugin/types.go
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@ -0,0 +1,106 @@
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// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package plugin
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import (
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"encoding/json"
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"net"
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"github.com/appc/cni/pkg/ip"
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)
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// NetConf describes a network.
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type NetConf struct {
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Name string `json:"name,omitempty"`
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Type string `json:"type,omitempty"`
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IPAM struct {
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Type string `json:"type,omitempty"`
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} `json:"ipam,omitempty"`
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}
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// Result is what gets returned from the plugin (via stdout) to the caller
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type Result struct {
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IP4 *IPConfig `json:"ip4,omitempty"`
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IP6 *IPConfig `json:"ip6,omitempty"`
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}
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// IPConfig contains values necessary to configure an interface
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type IPConfig struct {
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IP net.IPNet
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Gateway net.IP
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Routes []Route
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}
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type Route struct {
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Dst net.IPNet
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GW net.IP
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}
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// net.IPNet is not JSON (un)marshallable so this duality is needed
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// for our custom ip.IPNet type
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// JSON (un)marshallable types
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type ipConfig struct {
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IP ip.IPNet `json:"ip"`
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Gateway net.IP `json:"gateway,omitempty"`
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Routes []Route `json:"routes,omitempty"`
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}
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type route struct {
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Dst ip.IPNet `json:"dst"`
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GW net.IP `json:"gw,omitempty"`
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}
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func (c *IPConfig) MarshalJSON() ([]byte, error) {
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ipc := ipConfig{
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IP: ip.IPNet(c.IP),
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Gateway: c.Gateway,
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Routes: c.Routes,
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}
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return json.Marshal(ipc)
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}
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func (c *IPConfig) UnmarshalJSON(data []byte) error {
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ipc := ipConfig{}
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if err := json.Unmarshal(data, &ipc); err != nil {
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return err
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}
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c.IP = net.IPNet(ipc.IP)
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c.Gateway = ipc.Gateway
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c.Routes = ipc.Routes
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return nil
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}
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func (r *Route) UnmarshalJSON(data []byte) error {
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rt := route{}
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if err := json.Unmarshal(data, &rt); err != nil {
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return err
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}
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r.Dst = net.IPNet(rt.Dst)
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r.GW = rt.GW
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return nil
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}
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func (r *Route) MarshalJSON() ([]byte, error) {
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rt := route{
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Dst: ip.IPNet(r.Dst),
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GW: r.GW,
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}
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return json.Marshal(rt)
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}
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