98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
package nebula
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import (
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"fmt"
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"io"
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"net"
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"os"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"github.com/sirupsen/logrus"
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)
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var deviceNameRE = regexp.MustCompile(`^tun[0-9]+$`)
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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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UnsafeRoutes []route
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l *logrus.Logger
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io.ReadWriteCloser
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}
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func newTunFromFd(l *logrus.Logger, deviceFd int, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int) (ifce *Tun, err error) {
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return nil, fmt.Errorf("newTunFromFd not supported in FreeBSD")
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}
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func newTun(l *logrus.Logger, deviceName string, cidr *net.IPNet, defaultMTU int, routes []route, unsafeRoutes []route, txQueueLen int, multiqueue bool) (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 FreeBSD")
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}
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if strings.HasPrefix(deviceName, "/dev/") {
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deviceName = strings.TrimPrefix(deviceName, "/dev/")
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}
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if !deviceNameRE.MatchString(deviceName) {
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return nil, fmt.Errorf("tun.dev must match `tun[0-9]+`")
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}
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return &Tun{
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Device: deviceName,
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Cidr: cidr,
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MTU: defaultMTU,
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UnsafeRoutes: unsafeRoutes,
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l: l,
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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.ReadWriteCloser, err = os.OpenFile("/dev/"+c.Device, os.O_RDWR, 0)
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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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// TODO use syscalls instead of exec.Command
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c.l.Debug("command: ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String())
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if err = exec.Command("/sbin/ifconfig", c.Device, c.Cidr.String(), c.Cidr.IP.String()).Run(); err != nil {
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return fmt.Errorf("failed to run 'ifconfig': %s", err)
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}
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c.l.Debug("command: route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device)
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if err = exec.Command("/sbin/route", "-n", "add", "-net", c.Cidr.String(), "-interface", c.Device).Run(); err != nil {
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return fmt.Errorf("failed to run 'route add': %s", err)
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}
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c.l.Debug("command: ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU))
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if err = exec.Command("/sbin/ifconfig", c.Device, "mtu", strconv.Itoa(c.MTU)).Run(); err != nil {
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return fmt.Errorf("failed to run 'ifconfig': %s", err)
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}
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// Unsafe path routes
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for _, r := range c.UnsafeRoutes {
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c.l.Debug("command: route", "-n", "add", "-net", r.route.String(), "-interface", c.Device)
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if err = exec.Command("/sbin/route", "-n", "add", "-net", r.route.String(), "-interface", c.Device).Run(); err != nil {
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return fmt.Errorf("failed to run 'route add' for unsafe_route %s: %s", r.route.String(), err)
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}
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}
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return nil
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}
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func (c *Tun) CidrNet() *net.IPNet {
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return c.Cidr
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}
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func (c *Tun) DeviceName() string {
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return c.Device
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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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func (t *Tun) NewMultiQueueReader() (io.ReadWriteCloser, error) {
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return nil, fmt.Errorf("TODO: multiqueue not implemented for freebsd")
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}
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