dfaef9d393
reason: update license to Mulan PSL v2 Signed-off-by: taleintervenor <taleintervenor@aliyun.com>
58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
// Copyright (c) Huawei Technologies Co., Ltd. 2018-2019. All rights reserved.
|
|
// syscontainer-tools is licensed under the Mulan PSL v2.
|
|
// You can use this software according to the terms and conditions of the Mulan PSL v2.
|
|
// You may obtain a copy of Mulan PSL v2 at:
|
|
// http://license.coscl.org.cn/MulanPSL2
|
|
// THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR
|
|
// PURPOSE.
|
|
// See the Mulan PSL v2 for more details.
|
|
// Description: netns invoke
|
|
// Author: zhangwei
|
|
// Create: 2018-01-18
|
|
|
|
package nsutils
|
|
|
|
import (
|
|
"fmt"
|
|
"runtime"
|
|
|
|
"github.com/vishvananda/netns"
|
|
)
|
|
|
|
// NsInvoke function is used for setting network outside/inside the container/netns
|
|
// prefunc is called in the host, and postfunc is used in container
|
|
func NsInvoke(path string, prefunc func(nsFD int) error, postfunc func(callerFD int) error) error {
|
|
initns, err := netns.Get()
|
|
if err != nil {
|
|
return fmt.Errorf("failed get network namespace %v", err)
|
|
}
|
|
defer initns.Close()
|
|
|
|
ns, err := netns.GetFromPath(path)
|
|
if err != nil {
|
|
return fmt.Errorf("failed get network namespace %s: %v", path, err)
|
|
}
|
|
defer ns.Close()
|
|
|
|
// Invoked before the namespace switch happens but after the namespace file
|
|
// handle is obtained.
|
|
if err := prefunc(int(ns)); err != nil {
|
|
return fmt.Errorf("failed in prefunc: %v", err)
|
|
}
|
|
|
|
runtime.LockOSThread()
|
|
defer runtime.UnlockOSThread()
|
|
|
|
if err = netns.Set(ns); err != nil {
|
|
return err
|
|
}
|
|
// Invoked after the namespace switch.
|
|
err = postfunc(int(initns))
|
|
if err1 := netns.Set(initns); err1 != nil {
|
|
return fmt.Errorf("failed to set to initial namespace: %v: %v", err1, err)
|
|
}
|
|
|
|
return err
|
|
}
|