9604565b22
This diff adds -hostprefix option in dhcp daemon. This option could be used to run dhcp daemon as container because container cannot touch host's netns directly. The diff changes dhcp daemon to touch procfs mounted to another path, like '/hostfs/proc'.
96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
// Copyright 2015 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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"flag"
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"fmt"
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"log"
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"net/rpc"
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"os"
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"path/filepath"
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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/types/current"
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"github.com/containernetworking/cni/pkg/version"
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)
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const socketPath = "/run/cni/dhcp.sock"
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func main() {
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if len(os.Args) > 1 && os.Args[1] == "daemon" {
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var pidfilePath string
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var hostPrefix string
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daemonFlags := flag.NewFlagSet("daemon", flag.ExitOnError)
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daemonFlags.StringVar(&pidfilePath, "pidfile", "", "optional path to write daemon PID to")
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daemonFlags.StringVar(&hostPrefix, "hostprefix", "", "optional prefix to netns")
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daemonFlags.Parse(os.Args[2:])
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if err := runDaemon(pidfilePath, hostPrefix); err != nil {
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log.Printf(err.Error())
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os.Exit(1)
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}
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} else {
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skel.PluginMain(cmdAdd, cmdDel, version.All)
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}
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}
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func cmdAdd(args *skel.CmdArgs) error {
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// Plugin must return result in same version as specified in netconf
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versionDecoder := &version.ConfigDecoder{}
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confVersion, err := versionDecoder.Decode(args.StdinData)
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if err != nil {
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return err
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}
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result := ¤t.Result{}
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if err := rpcCall("DHCP.Allocate", args, result); err != nil {
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return err
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}
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return types.PrintResult(result, confVersion)
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}
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func cmdDel(args *skel.CmdArgs) error {
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result := struct{}{}
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if err := rpcCall("DHCP.Release", args, &result); err != nil {
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return fmt.Errorf("error dialing DHCP daemon: %v", err)
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}
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return nil
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}
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func rpcCall(method string, args *skel.CmdArgs, result interface{}) error {
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client, err := rpc.DialHTTP("unix", socketPath)
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if err != nil {
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return fmt.Errorf("error dialing DHCP daemon: %v", err)
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}
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// The daemon may be running under a different working dir
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// so make sure the netns path is absolute.
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netns, err := filepath.Abs(args.Netns)
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if err != nil {
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return fmt.Errorf("failed to make %q an absolute path: %v", args.Netns, err)
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}
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args.Netns = netns
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err = client.Call(method, args, result)
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if err != nil {
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return fmt.Errorf("error calling %v: %v", method, err)
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}
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return nil
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}
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