package yggdrasil // The darwin platform specific tun parts import "unsafe" import "strings" import "strconv" import "encoding/binary" import "golang.org/x/sys/unix" 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 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 }