yggdrasil-go/src/yggdrasil/tun_darwin.go

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package yggdrasil
// The darwin platform specific tun parts
import "syscall"
import "unsafe"
import "strings"
import "strconv"
import "encoding/binary"
import water "github.com/songgao/water"
func (tun *tunDevice) setup(ifname string, addr string, mtu int) error {
config := water.Config{DeviceType: water.TUN}
iface, err := water.New(config)
if err != nil {
panic(err)
}
tun.iface = iface
tun.mtu = mtu
return tun.setupAddress(addr)
}
const AF_INET6 = 30
const IN6_IFF_NODAD = 0x0020
const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 26
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
}
func (tun *tunDevice) setupAddress(addr string) error {
var fd int
var err error
if fd, err = syscall.Socket(syscall.AF_INET6, syscall.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 = 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
tun.core.log.Printf("Interface name: %s", ar.ifra_name)
tun.core.log.Printf("Interface IPv6: %s", addr)
/*
var bytes *[unsafe.Sizeof(ar)]byte = (*[unsafe.Sizeof(ar)]byte)(unsafe.Pointer(&ar));
var out string;
for i := 0; i < int(unsafe.Sizeof(ar)); i ++ {
out += fmt.Sprintf("0x%02x", (*bytes)[i]);
if i % 8 == 7 {
out += "\n"
} else {
out += " "
}
}
tun.core.log.Printf("in6_aliasreq:\n%s", out);
*/
if _, _, errno := syscall.Syscall(syscall.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
}
return err
}