nebula/tun_windows.go

91 lines
2.1 KiB
Go

package nebula
import (
"fmt"
"net"
"os/exec"
"strconv"
"github.com/songgao/water"
)
type Tun struct {
Device string
Cidr *net.IPNet
MTU int
UnsafeRoutes []route
*water.Interface
}
func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
if len(routes) > 0 {
return nil, fmt.Errorf("Route MTU not supported in Windows")
}
// NOTE: You cannot set the deviceName under Windows, so you must check tun.Device after calling .Activate()
return &Tun{
Cidr: cidr,
MTU: defaultMTU,
UnsafeRoutes: unsafeRoutes,
}, nil
}
func (c *Tun) Activate() error {
var err error
c.Interface, err = water.New(water.Config{
DeviceType: water.TUN,
PlatformSpecificParams: water.PlatformSpecificParams{
ComponentID: "tap0901",
Network: c.Cidr.String(),
},
})
if err != nil {
return fmt.Errorf("Activate failed: %v", err)
}
c.Device = c.Interface.Name()
// TODO use syscalls instead of exec.Command
err = exec.Command(
`C:\Windows\System32\netsh.exe`, "interface", "ipv4", "set", "address",
fmt.Sprintf("name=%s", c.Device),
"source=static",
fmt.Sprintf("addr=%s", c.Cidr.IP),
fmt.Sprintf("mask=%s", net.IP(c.Cidr.Mask)),
"gateway=none",
).Run()
if err != nil {
return fmt.Errorf("failed to run 'netsh' to set address: %s", err)
}
err = exec.Command(
`C:\Windows\System32\netsh.exe`, "interface", "ipv4", "set", "interface",
c.Device,
fmt.Sprintf("mtu=%d", c.MTU),
).Run()
if err != nil {
return fmt.Errorf("failed to run 'netsh' to set MTU: %s", err)
}
iface, err := net.InterfaceByName(c.Device)
if err != nil {
return fmt.Errorf("failed to find interface named %s: %v", c.Device, err)
}
for _, r := range c.UnsafeRoutes {
err = exec.Command(
"C:\\Windows\\System32\\route.exe", "add", r.route.String(), r.via.String(), "IF", strconv.Itoa(iface.Index),
).Run()
if err != nil {
return fmt.Errorf("failed to add the unsafe_route %s: %v", r.route.String(), err)
}
}
return nil
}
func (c *Tun) WriteRaw(b []byte) error {
_, err := c.Write(b)
return err
}