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// Copyright 2021 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 main
import (
"encoding/json"
"fmt"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
type100 "github.com/containernetworking/cni/pkg/types/100"
"github.com/containernetworking/cni/pkg/version"
"github.com/containernetworking/plugins/pkg/ns"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
"io"
"os"
"os/exec"
)
type NetConf struct {
types.NetConf
CNIOutput string `json:"cniOutput,omitempty"`
AddHooks [][]string `json:"addHooks,omitempty"`
DelHooks [][]string `json:"delHooks,omitempty"`
CheckHooks [][]string `json:"checkHooks,omitempty"`
}
func main() {
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("none"))
}
func outputCmdArgs(fp io.Writer, args *skel.CmdArgs) {
fmt.Fprintf(fp, `ContainerID: %s
Netns: %s
IfName: %s
Args: %s
Path: %s
StdinData: %s
----------------------
`,
args.ContainerID,
args.Netns,
args.IfName,
args.Args,
args.Path,
string(args.StdinData))
}
func parseConf(data []byte) (*NetConf, error) {
conf := &NetConf{}
if err := json.Unmarshal(data, &conf); err != nil {
return nil, fmt.Errorf("failed to parse")
}
return conf, nil
}
func getResult(netConf *NetConf) *type100.Result {
if netConf.RawPrevResult == nil {
return &type100.Result{}
}
version.ParsePrevResult(&netConf.NetConf)
result, _ := type100.NewResultFromResult(netConf.PrevResult)
return result
}
func executeHooks(netnsName string, hooks [][]string) {
netns, err := ns.GetNS(netnsName)
if err != nil {
return
}
defer netns.Close()
netns.Do(func(_ ns.NetNS) error {
for _, hookStrs := range hooks {
hookCmd := hookStrs[0]
hookArgs := hookStrs[1:]
output, err := exec.Command(hookCmd, hookArgs...).Output()
if err != nil {
fmt.Fprintf(os.Stderr, "OUTPUT: %v", output)
fmt.Fprintf(os.Stderr, "ERR: %v", err)
}
}
return nil
})
}
func cmdAdd(args *skel.CmdArgs) error {
netConf, _ := parseConf(args.StdinData)
// Output CNI
if netConf.CNIOutput != "" {
fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
defer fp.Close()
fmt.Fprintf(fp, "CmdAdd\n")
outputCmdArgs(fp, args)
}
// call hooks
if netConf.AddHooks != nil {
executeHooks(args.Netns, netConf.AddHooks)
}
return types.PrintResult(getResult(netConf), netConf.CNIVersion)
}
func cmdDel(args *skel.CmdArgs) error {
netConf, _ := parseConf(args.StdinData)
// Output CNI
if netConf.CNIOutput != "" {
fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
defer fp.Close()
fmt.Fprintf(fp, "CmdDel\n")
outputCmdArgs(fp, args)
}
// call hooks
if netConf.DelHooks != nil {
executeHooks(args.Netns, netConf.DelHooks)
}
return types.PrintResult(&type100.Result{}, netConf.CNIVersion)
}
func cmdCheck(args *skel.CmdArgs) error {
netConf, _ := parseConf(args.StdinData)
// Output CNI
if netConf.CNIOutput != "" {
fp, _ := os.OpenFile(netConf.CNIOutput, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
defer fp.Close()
fmt.Fprintf(fp, "CmdCheck\n")
outputCmdArgs(fp, args)
}
// call hooks
if netConf.CheckHooks != nil {
executeHooks(args.Netns, netConf.CheckHooks)
}
return types.PrintResult(&type100.Result{}, netConf.CNIVersion)
}
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