149 lines
3.8 KiB
Go
149 lines
3.8 KiB
Go
// Copyright 2021 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 main
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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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"os"
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"os/exec"
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"github.com/containernetworking/plugins/pkg/ns"
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bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
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"github.com/containernetworking/cni/pkg/skel"
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"github.com/containernetworking/cni/pkg/types"
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type100 "github.com/containernetworking/cni/pkg/types/100"
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"github.com/containernetworking/cni/pkg/version"
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)
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type NetConf struct {
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types.NetConf
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CNIOutput string `json:"cniOutput,omitempty"`
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AddHooks [][]string `json:"addHooks,omitempty"`
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DelHooks [][]string `json:"delHooks,omitempty"`
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CheckHooks [][]string `json:"checkHooks,omitempty"`
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}
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func main() {
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skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("none"))
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}
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func outputCmdArgs(fp io.Writer, args *skel.CmdArgs) {
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fmt.Fprintf(fp, `ContainerID: %s
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Netns: %s
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IfName: %s
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Args: %s
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Path: %s
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StdinData: %s
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----------------------
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`,
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args.ContainerID,
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args.Netns,
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args.IfName,
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args.Args,
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args.Path,
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string(args.StdinData))
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}
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func parseConf(data []byte) (*NetConf, error) {
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conf := &NetConf{}
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if err := json.Unmarshal(data, &conf); err != nil {
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return nil, fmt.Errorf("failed to parse")
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}
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return conf, nil
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}
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func getResult(netConf *NetConf) *type100.Result {
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if netConf.RawPrevResult == nil {
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return &type100.Result{}
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}
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version.ParsePrevResult(&netConf.NetConf)
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result, _ := type100.NewResultFromResult(netConf.PrevResult)
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return result
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}
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func executeHooks(netnsName string, hooks [][]string) {
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netns, err := ns.GetNS(netnsName)
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if err != nil {
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return
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}
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defer netns.Close()
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netns.Do(func(_ ns.NetNS) error {
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for _, hookStrs := range hooks {
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hookCmd := hookStrs[0]
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hookArgs := hookStrs[1:]
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output, err := exec.Command(hookCmd, hookArgs...).Output()
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if err != nil {
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fmt.Fprintf(os.Stderr, "OUTPUT: %v", output)
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fmt.Fprintf(os.Stderr, "ERR: %v", err)
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}
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}
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return nil
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})
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}
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func cmdAdd(args *skel.CmdArgs) error {
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netConf, _ := parseConf(args.StdinData)
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// Output CNI
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if netConf.CNIOutput != "" {
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fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0o644)
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defer fp.Close()
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fmt.Fprintf(fp, "CmdAdd\n")
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outputCmdArgs(fp, args)
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}
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// call hooks
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if netConf.AddHooks != nil {
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executeHooks(args.Netns, netConf.AddHooks)
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}
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return types.PrintResult(getResult(netConf), netConf.CNIVersion)
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}
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func cmdDel(args *skel.CmdArgs) error {
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netConf, _ := parseConf(args.StdinData)
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// Output CNI
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if netConf.CNIOutput != "" {
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fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0o644)
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defer fp.Close()
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fmt.Fprintf(fp, "CmdDel\n")
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outputCmdArgs(fp, args)
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}
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// call hooks
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if netConf.DelHooks != nil {
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executeHooks(args.Netns, netConf.DelHooks)
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}
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return types.PrintResult(&type100.Result{}, netConf.CNIVersion)
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}
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func cmdCheck(args *skel.CmdArgs) error {
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netConf, _ := parseConf(args.StdinData)
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// Output CNI
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if netConf.CNIOutput != "" {
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fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0o644)
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defer fp.Close()
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fmt.Fprintf(fp, "CmdCheck\n")
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outputCmdArgs(fp, args)
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}
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// call hooks
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if netConf.CheckHooks != nil {
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executeHooks(args.Netns, netConf.CheckHooks)
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}
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return types.PrintResult(&type100.Result{}, netConf.CNIVersion)
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}
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