c70320b5ed
The plugin binary actually functions in two modes. The first mode is a regular CNI plugin. The second mode (when stared with "daemon" arg) runs a DHCP client daemon. When executed as a CNI plugin, it issues an RPC request to the daemon for actual processing. The daemon is required since a DHCP lease needs to be maintained by periodically renewing it. One instance of the daemon can server arbitrary number of containers/leases.
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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"fmt"
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"net/rpc"
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"os"
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"github.com/appc/cni/pkg/plugin"
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"github.com/appc/cni/pkg/skel"
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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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runDaemon()
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} else {
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skel.PluginMain(cmdAdd, cmdDel)
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}
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}
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func cmdAdd(args *skel.CmdArgs) 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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result := &plugin.Result{}
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err = client.Call("DHCP.Allocate", args, result)
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if err != nil {
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return fmt.Errorf("error calling DHCP.Add: %v", err)
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}
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return plugin.PrintResult(result)
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}
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func cmdDel(args *skel.CmdArgs) 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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dummy := struct{}{}
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err = client.Call("DHCP.Release", args, &dummy)
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if err != nil {
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return fmt.Errorf("error calling DHCP.Del: %v", err)
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}
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return nil
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}
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