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daemon_linux.go
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daemon_linux.go
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//go:build linux
/*
* Copyright 2020 The Dragonfly 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 daemon
import (
"fmt"
"os"
"golang.org/x/sys/unix"
logger "d7y.io/dragonfly/v2/internal/dflog"
)
func switchNetNamespace(target string) (func() error, error) {
fd, err := unix.Open(target, unix.O_RDONLY, 0)
if err != nil {
return nil, err
}
defer unix.Close(fd)
orgNS := fmt.Sprintf("/proc/%d/ns/net", os.Getpid())
// hold the original net namespace
orgFD, err := unix.Open(orgNS, unix.O_RDONLY, 0)
if err != nil {
return nil, err
}
logger.Infof("switch net namespace, from %s to %s", orgNS, target)
err = unix.Setns(fd, unix.CLONE_NEWNET)
if err != nil {
return nil, err
}
return func() error {
if err := unix.Setns(orgFD, unix.CLONE_NEWNET); err != nil {
logger.Errorf("recover net namespace, from %s to %s, error: %s", target, orgNS, err)
return err
}
logger.Infof("recover net namespace, from %s to %s", target, orgNS)
if err := unix.Close(orgFD); err != nil {
logger.Errorf("recover net namespace, close fd error: %s", err)
return err
}
logger.Infof("recover net namespace, close original fd")
return nil
}, nil
}