277 lines
6.8 KiB
Go
277 lines
6.8 KiB
Go
// Copyright 2016 CNI authors
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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 current
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import (
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"encoding/json"
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"fmt"
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"io"
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"net"
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"os"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/cni/pkg/types/020"
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)
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const ImplementedSpecVersion string = "0.4.0"
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var SupportedVersions = []string{"0.3.0", "0.3.1", ImplementedSpecVersion}
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func NewResult(data []byte) (types.Result, error) {
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result := &Result{}
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if err := json.Unmarshal(data, result); err != nil {
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return nil, err
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}
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return result, nil
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}
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func GetResult(r types.Result) (*Result, error) {
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resultCurrent, err := r.GetAsVersion(ImplementedSpecVersion)
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if err != nil {
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return nil, err
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}
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result, ok := resultCurrent.(*Result)
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if !ok {
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return nil, fmt.Errorf("failed to convert result")
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}
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return result, nil
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}
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var resultConverters = []struct {
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versions []string
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convert func(types.Result) (*Result, error)
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}{
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{types020.SupportedVersions, convertFrom020},
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{SupportedVersions, convertFrom030},
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}
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func convertFrom020(result types.Result) (*Result, error) {
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oldResult, err := types020.GetResult(result)
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if err != nil {
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return nil, err
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}
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newResult := &Result{
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CNIVersion: ImplementedSpecVersion,
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DNS: oldResult.DNS,
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Routes: []*types.Route{},
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}
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if oldResult.IP4 != nil {
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newResult.IPs = append(newResult.IPs, &IPConfig{
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Version: "4",
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Address: oldResult.IP4.IP,
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Gateway: oldResult.IP4.Gateway,
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})
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for _, route := range oldResult.IP4.Routes {
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newResult.Routes = append(newResult.Routes, &types.Route{
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Dst: route.Dst,
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GW: route.GW,
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})
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}
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}
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if oldResult.IP6 != nil {
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newResult.IPs = append(newResult.IPs, &IPConfig{
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Version: "6",
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Address: oldResult.IP6.IP,
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Gateway: oldResult.IP6.Gateway,
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})
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for _, route := range oldResult.IP6.Routes {
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newResult.Routes = append(newResult.Routes, &types.Route{
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Dst: route.Dst,
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GW: route.GW,
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})
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}
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}
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return newResult, nil
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}
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func convertFrom030(result types.Result) (*Result, error) {
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newResult, ok := result.(*Result)
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if !ok {
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return nil, fmt.Errorf("failed to convert result")
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}
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newResult.CNIVersion = ImplementedSpecVersion
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return newResult, nil
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}
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func NewResultFromResult(result types.Result) (*Result, error) {
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version := result.Version()
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for _, converter := range resultConverters {
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for _, supportedVersion := range converter.versions {
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if version == supportedVersion {
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return converter.convert(result)
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}
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}
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}
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return nil, fmt.Errorf("unsupported CNI result22 version %q", version)
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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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CNIVersion string `json:"cniVersion,omitempty"`
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Interfaces []*Interface `json:"interfaces,omitempty"`
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IPs []*IPConfig `json:"ips,omitempty"`
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Routes []*types.Route `json:"routes,omitempty"`
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DNS types.DNS `json:"dns,omitempty"`
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}
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// Convert to the older 0.2.0 CNI spec Result type
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func (r *Result) convertTo020() (*types020.Result, error) {
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oldResult := &types020.Result{
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CNIVersion: types020.ImplementedSpecVersion,
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DNS: r.DNS,
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}
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for _, ip := range r.IPs {
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// Only convert the first IP address of each version as 0.2.0
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// and earlier cannot handle multiple IP addresses
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if ip.Version == "4" && oldResult.IP4 == nil {
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oldResult.IP4 = &types020.IPConfig{
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IP: ip.Address,
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Gateway: ip.Gateway,
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}
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} else if ip.Version == "6" && oldResult.IP6 == nil {
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oldResult.IP6 = &types020.IPConfig{
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IP: ip.Address,
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Gateway: ip.Gateway,
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}
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}
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if oldResult.IP4 != nil && oldResult.IP6 != nil {
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break
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}
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}
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for _, route := range r.Routes {
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is4 := route.Dst.IP.To4() != nil
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if is4 && oldResult.IP4 != nil {
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oldResult.IP4.Routes = append(oldResult.IP4.Routes, types.Route{
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Dst: route.Dst,
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GW: route.GW,
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})
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} else if !is4 && oldResult.IP6 != nil {
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oldResult.IP6.Routes = append(oldResult.IP6.Routes, types.Route{
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Dst: route.Dst,
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GW: route.GW,
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})
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}
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}
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if oldResult.IP4 == nil && oldResult.IP6 == nil {
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return nil, fmt.Errorf("cannot convert: no valid IP addresses")
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}
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return oldResult, nil
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}
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func (r *Result) Version() string {
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return ImplementedSpecVersion
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}
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func (r *Result) GetAsVersion(version string) (types.Result, error) {
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switch version {
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case "0.3.0", "0.3.1", ImplementedSpecVersion:
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r.CNIVersion = version
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return r, nil
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case types020.SupportedVersions[0], types020.SupportedVersions[1], types020.SupportedVersions[2]:
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return r.convertTo020()
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}
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return nil, fmt.Errorf("cannot convert version 0.3.x to %q", version)
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}
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func (r *Result) Print() error {
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return r.PrintTo(os.Stdout)
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}
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func (r *Result) PrintTo(writer io.Writer) error {
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data, err := json.MarshalIndent(r, "", " ")
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if err != nil {
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return err
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}
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_, err = writer.Write(data)
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return err
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}
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// Convert this old version result to the current CNI version result
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func (r *Result) Convert() (*Result, error) {
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return r, nil
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}
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// Interface contains values about the created interfaces
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type Interface struct {
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Name string `json:"name"`
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Mac string `json:"mac,omitempty"`
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Sandbox string `json:"sandbox,omitempty"`
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}
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func (i *Interface) String() string {
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return fmt.Sprintf("%+v", *i)
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}
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// Int returns a pointer to the int value passed in. Used to
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// set the IPConfig.Interface field.
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func Int(v int) *int {
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return &v
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}
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// IPConfig contains values necessary to configure an IP address on an interface
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type IPConfig struct {
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// IP version, either "4" or "6"
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Version string
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// Index into Result structs Interfaces list
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Interface *int
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Address net.IPNet
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Gateway net.IP
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}
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func (i *IPConfig) String() string {
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return fmt.Sprintf("%+v", *i)
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}
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// JSON (un)marshallable types
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type ipConfig struct {
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Version string `json:"version"`
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Interface *int `json:"interface,omitempty"`
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Address types.IPNet `json:"address"`
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Gateway net.IP `json:"gateway,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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Version: c.Version,
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Interface: c.Interface,
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Address: types.IPNet(c.Address),
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Gateway: c.Gateway,
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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.Version = ipc.Version
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c.Interface = ipc.Interface
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c.Address = net.IPNet(ipc.Address)
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c.Gateway = ipc.Gateway
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return nil
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}
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