84 lines
2.4 KiB
Go
84 lines
2.4 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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// This is a "meta-plugin". It reads in its own netconf, it does not create
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// any network interface but just changes the network sysctl.
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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/ioutil"
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"path/filepath"
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"strings"
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"github.com/containernetworking/cni/pkg/ns"
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"github.com/containernetworking/cni/pkg/skel"
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"github.com/containernetworking/cni/pkg/types"
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"github.com/containernetworking/cni/pkg/version"
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)
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// TuningConf represents the network tuning configuration.
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type TuningConf struct {
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types.NetConf
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SysCtl map[string]string `json:"sysctl"`
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}
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func cmdAdd(args *skel.CmdArgs) error {
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tuningConf := TuningConf{}
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if err := json.Unmarshal(args.StdinData, &tuningConf); err != nil {
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return fmt.Errorf("failed to load netconf: %v", err)
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}
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// The directory /proc/sys/net is per network namespace. Enter in the
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// network namespace before writing on it.
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err := ns.WithNetNSPath(args.Netns, func(_ ns.NetNS) error {
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for key, value := range tuningConf.SysCtl {
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fileName := filepath.Join("/proc/sys", strings.Replace(key, ".", "/", -1))
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fileName = filepath.Clean(fileName)
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// Refuse to modify sysctl parameters that don't belong
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// to the network subsystem.
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if !strings.HasPrefix(fileName, "/proc/sys/net/") {
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return fmt.Errorf("invalid net sysctl key: %q", key)
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}
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content := []byte(value)
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err := ioutil.WriteFile(fileName, content, 0644)
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if err != nil {
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return err
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}
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}
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return nil
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})
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if err != nil {
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return err
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}
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result := types.Result{}
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return result.Print()
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}
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func cmdDel(args *skel.CmdArgs) error {
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// TODO: the settings are not reverted to the previous values. Reverting the
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// settings is not useful when the whole container goes away but it could be
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// useful in scenarios where plugins are added and removed at runtime.
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return nil
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}
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func main() {
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skel.PluginMain(cmdAdd, cmdDel, version.Legacy)
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}
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