nebula/tun_android.go

70 lines
1.3 KiB
Go

package nebula
import (
"fmt"
"io"
"net"
"os"
"golang.org/x/sys/unix"
)
type Tun struct {
io.ReadWriteCloser
fd int
Device string
Cidr *net.IPNet
MaxMTU int
DefaultMTU int
TXQueueLen int
Routes []route
UnsafeRoutes []route
}
func newTunFromFd(deviceFd int, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
file := os.NewFile(uintptr(deviceFd), "/dev/net/tun")
ifce = &Tun{
ReadWriteCloser: file,
fd: int(file.Fd()),
Device: "tun0",
Cidr: cidr,
DefaultMTU: defaultMTU,
TXQueueLen: txQueueLen,
Routes: routes,
UnsafeRoutes: unsafeRoutes,
}
return
}
func newTun(deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
return nil, fmt.Errorf("newTun not supported in Android")
}
func (c *Tun) WriteRaw(b []byte) error {
var nn int
for {
max := len(b)
n, err := unix.Write(c.fd, b[nn:max])
if n > 0 {
nn += n
}
if nn == len(b) {
return err
}
if err != nil {
return err
}
if n == 0 {
return io.ErrUnexpectedEOF
}
}
}
func (c Tun) Activate() error {
c.Device = "android"
return nil
}