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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 (
"fmt"
"net/rpc"
"os"
"path/filepath"
"github.com/containernetworking/cni/pkg/skel"
"github.com/containernetworking/cni/pkg/types"
)
const socketPath = "/run/cni/dhcp.sock"
func main() {
if len(os.Args) > 1 && os.Args[1] == "daemon" {
runDaemon()
} else {
skel.PluginMain(cmdAdd, cmdDel)
}
}
func cmdAdd(args *skel.CmdArgs) error {
result := types.Result{}
if err := rpcCall("DHCP.Allocate", args, &result); err != nil {
return err
}
return result.Print()
}
func cmdDel(args *skel.CmdArgs) error {
result := struct{}{}
if err := rpcCall("DHCP.Release", args, &result); err != nil {
return fmt.Errorf("error dialing DHCP daemon: %v", err)
}
return nil
}
func rpcCall(method string, args *skel.CmdArgs, result interface{}) error {
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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