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