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104 lines
2.5 KiB
104 lines
2.5 KiB
package network
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import (
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//Builtin
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"errors"
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"fmt"
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"os"
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// Internal
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//"github.com/op/go-logging"
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//External
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"github.com/milosgajdos83/tenus"
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)
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// Setup the networking inside the child
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// Namely setup the loopback interface
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// and the veth interface if requested
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func NetSetup(stn *SandboxNetwork) error {
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if os.Getpid() != 1 {
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panic(errors.New("Cannot use NetSetup from parent."))
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}
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if err := setupLoopback(stn); err != nil {
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return fmt.Errorf("Unable to setup loopback interface: %+v", err)
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}
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// If required configure veth
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if stn.VethGuest != "" {
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if err := setupVEth(stn); err != nil {
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return fmt.Errorf("Unable to setup veth interface: %+v", err)
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}
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}
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return nil
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}
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func (stn *SandboxNetwork) NetReconfigure() error {
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if os.Getpid() != 1 {
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panic(errors.New("Cannot use NetReconfigure from parent."))
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}
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// Set the link's default gateway
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if err := stn.Interface.SetLinkDefaultGw(&stn.Gateway); err != nil {
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return fmt.Errorf("Unable to set default route %s.", err)
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}
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return nil
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}
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func setupLoopback(stn *SandboxNetwork) error {
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// Bring loopback interface up
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lo, err := tenus.NewLinkFrom("lo")
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if err != nil {
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return fmt.Errorf("Unable to fetch loopback interface, %s.", err)
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}
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// Bring the link up
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err = lo.SetLinkUp()
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if err != nil {
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return fmt.Errorf("Unable to bring loopback interface up, %s.", err)
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}
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return nil
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}
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func setupVEth(stn *SandboxNetwork) error {
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ifc, err := tenus.NewLinkFrom(stn.VethGuest)
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if err != nil {
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return fmt.Errorf("Unable to fetch inteface %s, %s.", stn.VethGuest, err)
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}
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// Bring the link down to prepare for renaming
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if err = ifc.SetLinkDown(); err != nil {
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return fmt.Errorf("Unable to bring interface %s down, %s.", stn.VethGuest, err)
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}
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// Rename the interface to a standard eth0 (not really a necessity)
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if err = tenus.RenameInterface(stn.VethGuest, ozDefaultInterfaceInternal); err != nil {
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return fmt.Errorf("Unable to rename interface %s, %s.", stn.VethGuest, err)
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}
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// Refetch the interface again as it has changed
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ifc, err = tenus.NewLinkFrom(ozDefaultInterfaceInternal)
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if err != nil {
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return fmt.Errorf("Unable to fetch interface %s, %s.", ozDefaultInterfaceInternal, err)
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}
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// Bring the link back up
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if err = ifc.SetLinkUp(); err != nil {
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return fmt.Errorf("Unable to bring interface %s up, %s.", ozDefaultInterfaceInternal, err)
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}
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// Set the link's default gateway
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if err = ifc.SetLinkDefaultGw(&stn.Gateway); err != nil {
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return fmt.Errorf("Unable to set default route %s.", err)
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}
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stn.Interface = ifc
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return nil
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}
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