mirror of
https://github.com/clearlinux/rkt.git
synced 2026-09-01 02:44:56 +00:00
Eugene Yakubovich
115 lines
2.9 KiB
Go
115 lines
2.9 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 networking
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"net"
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"os"
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"os/exec"
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"path/filepath"
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"strings"
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"github.com/coreos/rocket/common"
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rktnet "github.com/coreos/rocket/networking/net"
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)
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// TODO(eyakubovich): make this configurable in rkt.conf
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const UserNetPluginsPath = "/usr/lib/rkt/plugins/net"
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const BuiltinNetPluginsPath = "usr/lib/rkt/plugins/net"
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func (e *containerEnv) netPluginAdd(n *Net, netns, args, ifName string) (net.IP, error) {
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output, err := e.execNetPlugin("ADD", n, netns, args, ifName)
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if err != nil {
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return nil, err
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}
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ifConf := rktnet.IfConfig{}
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if err = json.Unmarshal(output, &ifConf); err != nil {
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return nil, fmt.Errorf("error parsing %q output: %v", n.Name, err)
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}
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return ifConf.IP, nil
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}
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func (e *containerEnv) netPluginDel(n *Net, netns, args, ifName string) error {
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_, err := e.execNetPlugin("DEL", n, netns, args, ifName)
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return err
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}
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func (e *containerEnv) pluginPaths() []string {
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// try 3rd-party path first
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return []string{
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UserNetPluginsPath,
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filepath.Join(common.Stage1RootfsPath(e.rktRoot), BuiltinNetPluginsPath),
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}
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}
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func (e *containerEnv) findNetPlugin(plugin string) string {
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for _, p := range e.pluginPaths() {
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fullname := filepath.Join(p, plugin)
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if fi, err := os.Stat(fullname); err == nil && fi.Mode().IsRegular() {
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return fullname
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}
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}
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return ""
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}
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func envVars(vars [][2]string) []string {
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env := os.Environ()
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for _, kv := range vars {
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env = append(env, strings.Join(kv[:], "="))
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}
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return env
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}
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func (e *containerEnv) execNetPlugin(cmd string, n *Net, netns, args, ifName string) ([]byte, error) {
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pluginPath := e.findNetPlugin(n.Type)
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if pluginPath == "" {
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return nil, fmt.Errorf("Could not find plugin %q", n.Type)
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}
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vars := [][2]string{
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{"RKT_NETPLUGIN_COMMAND", cmd},
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{"RKT_NETPLUGIN_CONTID", e.contID.String()},
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{"RKT_NETPLUGIN_NETNS", netns},
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{"RKT_NETPLUGIN_ARGS", args},
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{"RKT_NETPLUGIN_IFNAME", ifName},
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{"RKT_NETPLUGIN_NETNAME", n.Name},
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{"RKT_NETPLUGIN_NETCONF", n.Filename},
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{"RKT_NETPLUGIN_IPAMPATH", strings.Join(e.pluginPaths(), ":")},
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}
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stdout := &bytes.Buffer{}
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c := exec.Cmd{
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Path: pluginPath,
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Args: []string{pluginPath},
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Env: envVars(vars),
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Stdout: stdout,
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Stderr: os.Stderr,
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}
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if err := c.Run(); err != nil {
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return nil, err
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}
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return stdout.Bytes(), nil
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}
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