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// Copyright (c) 2018-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package namespaces
import (
"fmt"
"os"
"runtime"
"syscall"
)
var setnsSysNo = map[string]uintptr{
"386": 346,
"arm64": 268,
"amd64": 308,
"arm": 375,
"ppc": 350,
"ppc64": 350,
"ppc64le": 350,
"s390x": 339,
}
var nsMap = map[string]uintptr{
"ipc": syscall.CLONE_NEWIPC,
"net": syscall.CLONE_NEWNET,
"mnt": syscall.CLONE_NEWNS,
"uts": syscall.CLONE_NEWUTS,
}
// Enter enters in provided process namespace.
func Enter(pid int, namespace string) error {
flag, ok := nsMap[namespace]
if !ok {
return fmt.Errorf("namespace %s not supported", namespace)
}
path := fmt.Sprintf("/proc/%d/ns/%s", pid, namespace)
f, err := os.Open(path)
if err != nil {
return fmt.Errorf("can't open namespace path %s: %s", path, err)
}
defer f.Close()
ns, ok := setnsSysNo[runtime.GOARCH]
if !ok {
return fmt.Errorf("unsupported platform %s", runtime.GOARCH)
}
_, _, errSys := syscall.RawSyscall(ns, f.Fd(), flag, 0)
if errSys != 0 {
return errSys
}
return nil
}
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