65 lines
1.3 KiB
Go
65 lines
1.3 KiB
Go
package ns
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import (
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"fmt"
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"os"
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"sync"
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"syscall"
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log "github.com/Sirupsen/logrus"
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"github.com/vishvananda/netlink"
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"github.com/vishvananda/netns"
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)
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var (
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initNs netns.NsHandle
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initNl *netlink.Handle
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initOnce sync.Once
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)
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// Init initializes a new network namespace
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func Init() {
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var err error
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initNs, err = netns.Get()
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if err != nil {
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log.Errorf("could not get initial namespace: %v", err)
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}
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initNl, err = netlink.NewHandle()
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if err != nil {
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log.Errorf("could not create netlink handle on initial namespace: %v", err)
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}
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}
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// SetNamespace sets the initial namespace handler
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func SetNamespace() error {
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if err := netns.Set(initNs); err != nil {
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linkInfo, linkErr := getLink()
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if linkErr != nil {
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linkInfo = linkErr.Error()
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}
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return fmt.Errorf("failed to set to initial namespace, %v, initns fd %d: %v", linkInfo, initNs, err)
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}
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return nil
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}
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// ParseHandlerInt transforms the namespace handler into an integer
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func ParseHandlerInt() int {
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return int(getHandler())
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}
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// GetHandler returns the namespace handler
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func getHandler() netns.NsHandle {
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initOnce.Do(Init)
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return initNs
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}
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func getLink() (string, error) {
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return os.Readlink(fmt.Sprintf("/proc/%d/task/%d/ns/net", os.Getpid(), syscall.Gettid()))
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}
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// NlHandle returns the netlink handler
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func NlHandle() *netlink.Handle {
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initOnce.Do(Init)
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return initNl
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}
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