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Merge pull request #3 from neilalexander/master

Update tun_darwin.go with working interface code using syscalls
This commit is contained in:
Arceliar 2018-01-15 08:57:37 -06:00 committed by GitHub
commit e3d87b8ee6
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2 changed files with 97 additions and 31 deletions

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@ -2,16 +2,25 @@ package yggdrasil
// This manages the tun driver to send/recv packets to/from applications
import water "github.com/songgao/water"
// import water "github.com/songgao/water"
const IPv6_HEADER_LENGTH = 40
type tunInterface interface {
IsTUN() bool
IsTAP() bool
Name() string
Read(to []byte) (int, error)
Write(from []byte) (int, error)
Close() error
}
type tunDevice struct {
core *Core
send chan<- []byte
recv <-chan []byte
mtu int
iface *water.Interface
iface tunInterface
}
func (tun *tunDevice) init(core *Core) {

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@ -1,14 +1,12 @@
package yggdrasil
// The darwin platform specific tun parts
// macOS/Darwin is BSD-derived and doesn't have iproute2. This code instead
// uses ifconfig. There is actually code that tries to do this properly using
// syscalls in github.com/neilalexander/yggdrasil-go branch "macos-interface"
// but for some reason it doesn't work as expected!
import "fmt"
import "os/exec"
import "unsafe"
import "strings"
import "strconv"
import "encoding/binary"
import "golang.org/x/sys/unix"
import water "github.com/songgao/water"
@ -19,30 +17,89 @@ func (tun *tunDevice) setup(ifname string, addr string, mtu int) error {
panic(err)
}
tun.iface = iface
tun.mtu = mtu //1280 // Lets default to the smallest thing allowed for now
tun.mtu = mtu
return tun.setupAddress(addr)
}
func (tun *tunDevice) setupAddress(addr string) error {
// Set address
cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6",
"add", addr)
tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("Darwin ifconfig failed: %v.", err)
tun.core.log.Println(string(output))
return err
}
// Set MTU and bring device up
cmd = exec.Command("ifconfig", tun.iface.Name(), "mtu",
fmt.Sprintf("%d", tun.mtu))
tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
output, err = cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("Darwin ifconfig failed: %v.", err)
tun.core.log.Println(string(output))
return err
}
return nil
const SIOCAIFADDR_IN6 = 2155899162
type in6_addrlifetime struct {
ia6t_expire float64
ia6t_preferred float64
ia6t_vltime uint32
ia6t_pltime uint32
}
type sockaddr_in6 struct {
sin6_len uint8
sin6_family uint8
sin6_port uint8
sin6_flowinfo uint32
sin6_addr [8]uint16
sin6_scope_id uint32
}
type in6_aliasreq struct {
ifra_name [16]byte
ifra_addr sockaddr_in6
ifra_dstaddr sockaddr_in6
ifra_prefixmask sockaddr_in6
ifra_flags uint32
ifra_lifetime in6_addrlifetime
}
type ifreq struct {
ifr_name [16]byte
ifru_mtu uint32
}
func (tun *tunDevice) setupAddress(addr string) error {
var fd int
var err error
if fd, err = unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0); err != nil {
tun.core.log.Printf("Create AF_SYSTEM socket failed: %v.", err)
return err
}
var ar in6_aliasreq
copy(ar.ifra_name[:], tun.iface.Name())
ar.ifra_prefixmask.sin6_len = uint8(unsafe.Sizeof(ar.ifra_prefixmask))
b := make([]byte, 16); binary.LittleEndian.PutUint16(b, uint16(0xFF00))
ar.ifra_prefixmask.sin6_addr[0] = uint16(binary.BigEndian.Uint16(b))
ar.ifra_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifra_addr))
ar.ifra_addr.sin6_family = unix.AF_INET6
parts := strings.Split(strings.TrimRight(addr, "/8"), ":")
for i := 0; i < 8; i++ {
addr, _ := strconv.ParseUint(parts[i], 16, 16)
b := make([]byte, 16); binary.LittleEndian.PutUint16(b, uint16(addr))
ar.ifra_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
}
ar.ifra_lifetime.ia6t_vltime = 0xFFFFFFFF
ar.ifra_lifetime.ia6t_pltime = 0xFFFFFFFF
var ir ifreq
copy(ir.ifr_name[:], tun.iface.Name())
ir.ifru_mtu = uint32(tun.mtu)
tun.core.log.Printf("Interface name: %s", ar.ifra_name)
tun.core.log.Printf("Interface IPv6: %s", addr)
tun.core.log.Printf("Interface MTU: %d", ir.ifru_mtu)
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(SIOCAIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
err = errno
tun.core.log.Printf("Error in SIOCAIFADDR_IN6: %v", errno)
return err
}
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
err = errno
tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
return err
}
return err
}