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// Copyright 2015 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"
"flag"
"fmt"
"log"
"net/rpc"
"os"
"path/filepath"
"time"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
"github.com/containernetworking/cni/pkg/types/current"
"github.com/containernetworking/cni/pkg/version"
bv "github.com/containernetworking/plugins/pkg/utils/buildversion"
)
const defaultSocketPath = "/run/cni/dhcp.sock"
func main() {
if len(os.Args) > 1 && os.Args[1] == "daemon" {
var pidfilePath string
var hostPrefix string
var socketPath string
var broadcast bool
var timeout time.Duration
daemonFlags := flag.NewFlagSet("daemon", flag.ExitOnError)
daemonFlags.StringVar(&pidfilePath, "pidfile", "", "optional path to write daemon PID to")
daemonFlags.StringVar(&hostPrefix, "hostprefix", "", "optional prefix to host root")
daemonFlags.StringVar(&socketPath, "socketpath", "", "optional dhcp server socketpath")
daemonFlags.BoolVar(&broadcast, "broadcast", false, "broadcast DHCP leases")
daemonFlags.DurationVar(&timeout, "timeout", 10*time.Second, "optional dhcp client timeout duration")
daemonFlags.Parse(os.Args[2:])
if socketPath == "" {
socketPath = defaultSocketPath
}
if err := runDaemon(pidfilePath, hostPrefix, socketPath, timeout, broadcast); err != nil {
log.Printf(err.Error())
os.Exit(1)
}
} else {
skel.PluginMain(cmdAdd, cmdCheck, cmdDel, version.All, bv.BuildString("dhcp"))
}
}
func cmdAdd(args *skel.CmdArgs) error {
// Plugin must return result in same version as specified in netconf
versionDecoder := &version.ConfigDecoder{}
confVersion, err := versionDecoder.Decode(args.StdinData)
if err != nil {
return err
}
result := ¤t.Result{}
if err := rpcCall("DHCP.Allocate", args, result); err != nil {
return err
}
return types.PrintResult(result, confVersion)
}
func cmdDel(args *skel.CmdArgs) error {
result := struct{}{}
if err := rpcCall("DHCP.Release", args, &result); err != nil {
return err
}
return nil
}
func cmdCheck(args *skel.CmdArgs) error {
// TODO: implement
//return fmt.Errorf("not implemented")
// Plugin must return result in same version as specified in netconf
versionDecoder := &version.ConfigDecoder{}
//confVersion, err := versionDecoder.Decode(args.StdinData)
_, err := versionDecoder.Decode(args.StdinData)
if err != nil {
return err
}
result := ¤t.Result{}
if err := rpcCall("DHCP.Allocate", args, result); err != nil {
return err
}
return nil
}
type SocketPathConf struct {
DaemonSocketPath string `json:"daemonSocketPath,omitempty"`
}
type TempNetConf struct {
IPAM SocketPathConf `json:"ipam,omitempty"`
}
func getSocketPath(stdinData []byte) (string, error) {
conf := TempNetConf{}
if err := json.Unmarshal(stdinData, &conf); err != nil {
return "", fmt.Errorf("error parsing socket path conf: %v", err)
}
if conf.IPAM.DaemonSocketPath == "" {
return defaultSocketPath, nil
}
return conf.IPAM.DaemonSocketPath, nil
}
func rpcCall(method string, args *skel.CmdArgs, result interface{}) error {
socketPath, err := getSocketPath(args.StdinData)
if err != nil {
return fmt.Errorf("error obtaining socketPath: %v", err)
}
client, err := rpc.DialHTTP("unix", socketPath)
if err != nil {
return fmt.Errorf("error dialing DHCP daemon: %v", err)
}
// The daemon may be running under a different working dir
// so make sure the netns path is absolute.
netns, err := filepath.Abs(args.Netns)
if err != nil {
return fmt.Errorf("failed to make %q an absolute path: %v", args.Netns, err)
}
args.Netns = netns
err = client.Call(method, args, result)
if err != nil {
return fmt.Errorf("error calling %v: %v", method, err)
}
return nil
}
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