mirror of
https://github.com/vishvananda/netlink
synced 2024-12-28 17:42:08 +00:00
80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
// +build linux
|
|
|
|
package netlink
|
|
|
|
import (
|
|
"os"
|
|
"runtime"
|
|
"syscall"
|
|
"testing"
|
|
|
|
"github.com/vishvananda/netns"
|
|
)
|
|
|
|
// TestNetNsIdByFd tests setting and getting the network namespace ID
|
|
// by file descriptor. It opens a namespace fd, sets it to a random id,
|
|
// then retrieves the ID.
|
|
// This does not do any namespace switching.
|
|
func TestNetNsIdByFd(t *testing.T) {
|
|
skipUnlessRoot(t)
|
|
// create a network namespace
|
|
ns, err := netns.New()
|
|
CheckErrorFail(t, err)
|
|
|
|
// set its ID
|
|
// In an attempt to avoid namespace id collisions, set this to something
|
|
// insanely high. When the kernel assigns IDs, it does so starting from 0
|
|
// So, just use our pid shifted up 16 bits
|
|
wantID := os.Getpid() << 16
|
|
|
|
h, err := NewHandle()
|
|
CheckErrorFail(t, err)
|
|
err = h.SetNetNsIdByFd(int(ns), wantID)
|
|
CheckErrorFail(t, err)
|
|
|
|
// Get the ID back, make sure it matches
|
|
haveID, _ := h.GetNetNsIdByFd(int(ns))
|
|
if haveID != wantID {
|
|
t.Errorf("GetNetNsIdByFd returned %d, want %d", haveID, wantID)
|
|
}
|
|
|
|
ns.Close()
|
|
}
|
|
|
|
// TestNetNsIdByPid tests manipulating namespace IDs by pid (really, task / thread id)
|
|
// Does the same as TestNetNsIdByFd, but we need to change namespaces so we
|
|
// actually have a pid in that namespace
|
|
func TestNetNsIdByPid(t *testing.T) {
|
|
skipUnlessRoot(t)
|
|
runtime.LockOSThread() // we need a constant OS thread
|
|
origNs, _ := netns.Get()
|
|
|
|
// create and enter a new netns
|
|
ns, err := netns.New()
|
|
CheckErrorFail(t, err)
|
|
err = netns.Set(ns)
|
|
CheckErrorFail(t, err)
|
|
// make sure we go back to the original namespace when done
|
|
defer func() {
|
|
err := netns.Set(origNs)
|
|
if err != nil {
|
|
panic("failed to restore network ns, bailing")
|
|
}
|
|
runtime.UnlockOSThread()
|
|
}()
|
|
|
|
// As above, we'll pick a crazy large netnsid to avoid collisions
|
|
wantID := syscall.Gettid() << 16
|
|
|
|
h, err := NewHandle()
|
|
CheckErrorFail(t, err)
|
|
err = h.SetNetNsIdByPid(syscall.Gettid(), wantID)
|
|
CheckErrorFail(t, err)
|
|
|
|
//Get the ID and see if it worked
|
|
haveID, _ := h.GetNetNsIdByPid(syscall.Gettid())
|
|
if haveID != wantID {
|
|
t.Errorf("GetNetNsIdByPid returned %d, want %d", haveID, wantID)
|
|
}
|
|
}
|