mirror of https://github.com/slackhq/nebula.git
60 lines
1.4 KiB
Go
60 lines
1.4 KiB
Go
|
package nebula
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"net"
|
||
|
|
"os/exec"
|
||
|
|
"strconv"
|
||
|
|
|
||
|
|
"github.com/songgao/water"
|
||
|
|
)
|
||
|
|
|
||
|
|
type Tun struct {
|
||
|
|
Device string
|
||
|
|
Cidr *net.IPNet
|
||
|
|
MTU int
|
||
|
|
|
||
|
|
*water.Interface
|
||
|
|
}
|
||
|
|
|
||
|
|
func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, txQueueLen int) (ifce *Tun, err error) {
|
||
|
|
if len(routes) > 0 {
|
||
|
|
return nil, fmt.Errorf("Route MTU not supported in Darwin")
|
||
|
|
}
|
||
|
|
// NOTE: You cannot set the deviceName under Darwin, so you must check tun.Device after calling .Activate()
|
||
|
|
return &Tun{
|
||
|
|
Cidr: cidr,
|
||
|
|
MTU: defaultMTU,
|
||
|
|
}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *Tun) Activate() error {
|
||
|
|
var err error
|
||
|
|
c.Interface, err = water.New(water.Config{
|
||
|
|
DeviceType: water.TUN,
|
||
|
|
})
|
||
|
|
if err != nil {
|
||
|
|
return fmt.Errorf("Activate failed: %v", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
c.Device = c.Interface.Name()
|
||
|
|
|
||
|
|
// TODO use syscalls instead of exec.Command
|
||
|
|
if err = exec.Command("ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String()).Run(); err != nil {
|
||
|
|
return fmt.Errorf("failed to run 'ifconfig': %s", err)
|
||
|
|
}
|
||
|
|
if err = exec.Command("route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device).Run(); err != nil {
|
||
|
|
return fmt.Errorf("failed to run 'route add': %s", err)
|
||
|
|
}
|
||
|
|
if err = exec.Command("ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU)).Run(); err != nil {
|
||
|
|
return fmt.Errorf("failed to run 'ifconfig': %s", err)
|
||
|
|
}
|
||
|
|
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (c *Tun) WriteRaw(b []byte) error {
|
||
|
|
_, err := c.Write(b)
|
||
|
|
return err
|
||
|
|
}
|