nebula/tun_freebsd.go

78 lines
2.2 KiB
Go

package nebula
import (
"fmt"
"io"
"net"
"os"
"os/exec"
"regexp"
"strconv"
"strings"
)
var deviceNameRE = regexp.MustCompile(`^tun[0-9]+$`)
type Tun struct {
Device string
Cidr *net.IPNet
MTU int
UnsafeRoutes []route
io.ReadWriteCloser
}
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 FreeBSD")
}
if strings.HasPrefix(deviceName, "/dev/") {
deviceName = strings.TrimPrefix(deviceName, "/dev/")
}
if !deviceNameRE.MatchString(deviceName) {
return nil, fmt.Errorf("tun.dev must match `tun[0-9]+`")
}
return &Tun{
Device: deviceName,
Cidr: cidr,
MTU: defaultMTU,
UnsafeRoutes: unsafeRoutes,
}, nil
}
func (c *Tun) Activate() error {
var err error
c.ReadWriteCloser, err = os.OpenFile("/dev/"+c.Device, os.O_RDWR, 0)
if err != nil {
return fmt.Errorf("Activate failed: %v", err)
}
// TODO use syscalls instead of exec.Command
l.Debug("command: ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String())
if err = exec.Command("/sbin/ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String()).Run(); err != nil {
return fmt.Errorf("failed to run 'ifconfig': %s", err)
}
l.Debug("command: route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device)
if err = exec.Command("/sbin/route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device).Run(); err != nil {
return fmt.Errorf("failed to run 'route add': %s", err)
}
l.Debug("command: ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU))
if err = exec.Command("/sbin/ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU)).Run(); err != nil {
return fmt.Errorf("failed to run 'ifconfig': %s", err)
}
// Unsafe path routes
for _, r := range c.UnsafeRoutes {
l.Debug("command: route", "-n", "add", "-net", r.route.String(), "-interface", c.Device)
if err = exec.Command("/sbin/route", "-n", "add", "-net", r.route.String(), "-interface", c.Device).Run(); err != nil {
return fmt.Errorf("failed to run 'route add' for unsafe_route %s: %s", r.route.String(), err)
}
}
return nil
}
func (c *Tun) WriteRaw(b []byte) error {
_, err := c.Write(b)
return err
}