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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 (
"context"
"crypto/sha512"
"encoding/json"
"fmt"
"os"
"path/filepath"
"strings"
"github.com/containernetworking/cni/libcni"
)
// Protocol parameters are passed to the plugins via OS environment variables.
const (
EnvCNIPath = "CNI_PATH"
EnvNetDir = "NETCONFPATH"
EnvCapabilityArgs = "CAP_ARGS"
EnvCNIArgs = "CNI_ARGS"
EnvCNIIfname = "CNI_IFNAME"
DefaultNetDir = "/etc/cni/net.d"
CmdAdd = "add"
CmdCheck = "check"
CmdDel = "del"
)
func parseArgs(args string) ([][2]string, error) {
var result [][2]string
pairs := strings.Split(args, ";")
for _, pair := range pairs {
kv := strings.Split(pair, "=")
if len(kv) != 2 || kv[0] == "" || kv[1] == "" {
return nil, fmt.Errorf("invalid CNI_ARGS pair %q", pair)
}
result = append(result, [2]string{kv[0], kv[1]})
}
return result, nil
}
func main() {
if len(os.Args) < 4 {
usage()
}
netdir := os.Getenv(EnvNetDir)
if netdir == "" {
netdir = DefaultNetDir
}
netconf, err := libcni.LoadConfList(netdir, os.Args[2])
if err != nil {
exit(err)
}
var capabilityArgs map[string]interface{}
capabilityArgsValue := os.Getenv(EnvCapabilityArgs)
if len(capabilityArgsValue) > 0 {
if err = json.Unmarshal([]byte(capabilityArgsValue), &capabilityArgs); err != nil {
exit(err)
}
}
var cniArgs [][2]string
args := os.Getenv(EnvCNIArgs)
if len(args) > 0 {
cniArgs, err = parseArgs(args)
if err != nil {
exit(err)
}
}
ifName, ok := os.LookupEnv(EnvCNIIfname)
if !ok {
ifName = "eth0"
}
netns := os.Args[3]
netns, err = filepath.Abs(netns)
if err != nil {
exit(err)
}
// Generate the containerid by hashing the netns path
s := sha512.Sum512([]byte(netns))
containerID := fmt.Sprintf("cnitool-%x", s[:10])
cninet := libcni.NewCNIConfig(filepath.SplitList(os.Getenv(EnvCNIPath)), nil)
rt := &libcni.RuntimeConf{
ContainerID: containerID,
NetNS: netns,
IfName: ifName,
Args: cniArgs,
CapabilityArgs: capabilityArgs,
}
switch os.Args[1] {
case CmdAdd:
result, err := cninet.AddNetworkList(context.TODO(), netconf, rt)
if result != nil {
_ = result.Print()
}
exit(err)
case CmdCheck:
err := cninet.CheckNetworkList(context.TODO(), netconf, rt)
exit(err)
case CmdDel:
exit(cninet.DelNetworkList(context.TODO(), netconf, rt))
}
}
func usage() {
exe := filepath.Base(os.Args[0])
fmt.Fprintf(os.Stderr, "%s: Add, check, or remove network interfaces from a network namespace\n", exe)
fmt.Fprintf(os.Stderr, " %s add <net> <netns>\n", exe)
fmt.Fprintf(os.Stderr, " %s check <net> <netns>\n", exe)
fmt.Fprintf(os.Stderr, " %s del <net> <netns>\n", exe)
os.Exit(1)
}
func exit(err error) {
if err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err)
os.Exit(1)
}
os.Exit(0)
}
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