forked from github/multus-cni
92a8b1c1c9
Updated containernetworking/cni moves pkg/ns to containernetworking/plugins so we need that now too.
136 lines
2.9 KiB
Go
136 lines
2.9 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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"crypto/sha512"
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"encoding/json"
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"github.com/containernetworking/cni/libcni"
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)
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const (
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EnvCNIPath = "CNI_PATH"
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EnvNetDir = "NETCONFPATH"
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EnvCapabilityArgs = "CAP_ARGS"
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EnvCNIArgs = "CNI_ARGS"
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DefaultNetDir = "/etc/cni/net.d"
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CmdAdd = "add"
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CmdDel = "del"
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)
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func parseArgs(args string) ([][2]string, error) {
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var result [][2]string
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pairs := strings.Split(args, ";")
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for _, pair := range pairs {
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kv := strings.Split(pair, "=")
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if len(kv) != 2 || kv[0] == "" || kv[1] == "" {
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return nil, fmt.Errorf("invalid CNI_ARGS pair %q", pair)
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}
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result = append(result, [2]string{kv[0], kv[1]})
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}
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return result, nil
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}
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func main() {
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if len(os.Args) < 3 {
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usage()
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return
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}
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netdir := os.Getenv(EnvNetDir)
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if netdir == "" {
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netdir = DefaultNetDir
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}
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netconf, err := libcni.LoadConfList(netdir, os.Args[2])
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if err != nil {
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exit(err)
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}
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var capabilityArgs map[string]interface{}
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capabilityArgsValue := os.Getenv(EnvCapabilityArgs)
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if len(capabilityArgsValue) > 0 {
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if err = json.Unmarshal([]byte(capabilityArgsValue), &capabilityArgs); err != nil {
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exit(err)
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}
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}
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var cniArgs [][2]string
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args := os.Getenv(EnvCNIArgs)
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if len(args) > 0 {
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cniArgs, err = parseArgs(args)
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if err != nil {
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exit(err)
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}
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}
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netns := os.Args[3]
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netns, err = filepath.Abs(netns)
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if err != nil {
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exit(err)
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}
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// Generate the containerid by hashing the netns path
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s := sha512.Sum512([]byte(netns))
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containerID := fmt.Sprintf("cnitool-%x", s[:10])
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cninet := libcni.NewCNIConfig(filepath.SplitList(os.Getenv(EnvCNIPath)), nil)
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rt := &libcni.RuntimeConf{
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ContainerID: containerID,
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NetNS: netns,
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IfName: "eth0",
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Args: cniArgs,
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CapabilityArgs: capabilityArgs,
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}
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switch os.Args[1] {
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case CmdAdd:
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result, err := cninet.AddNetworkList(netconf, rt)
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if result != nil {
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_ = result.Print()
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}
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exit(err)
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case CmdDel:
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exit(cninet.DelNetworkList(netconf, rt))
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}
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}
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func usage() {
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exe := filepath.Base(os.Args[0])
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fmt.Fprintf(os.Stderr, "%s: Add or remove network interfaces from a network namespace\n", exe)
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fmt.Fprintf(os.Stderr, " %s %s <net> <netns>\n", exe, CmdAdd)
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fmt.Fprintf(os.Stderr, " %s %s <net> <netns>\n", exe, CmdDel)
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os.Exit(1)
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}
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func exit(err error) {
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if err != nil {
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fmt.Fprintf(os.Stderr, "%s\n", err)
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os.Exit(1)
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}
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os.Exit(0)
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}
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