mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-15 13:10:28 +00:00
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
package yggdrasil
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// The darwin platform specific tun parts
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import (
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"encoding/binary"
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"strconv"
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"strings"
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"unsafe"
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"golang.org/x/sys/unix"
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water "github.com/yggdrasil-network/water"
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)
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// Configures the "utun" adapter with the correct IPv6 address and MTU.
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func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
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if iftapmode {
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tun.core.log.Printf("TAP mode is not supported on this platform, defaulting to TUN")
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}
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config := water.Config{DeviceType: water.TUN}
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iface, err := water.New(config)
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if err != nil {
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panic(err)
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}
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tun.iface = iface
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tun.mtu = getSupportedMTU(mtu)
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return tun.setupAddress(addr)
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}
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const darwin_SIOCAIFADDR_IN6 = 2155899162
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type in6_addrlifetime struct {
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ia6t_expire float64
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ia6t_preferred float64
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ia6t_vltime uint32
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ia6t_pltime uint32
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}
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type sockaddr_in6 struct {
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sin6_len uint8
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sin6_family uint8
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sin6_port uint8
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sin6_flowinfo uint32
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sin6_addr [8]uint16
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sin6_scope_id uint32
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}
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type in6_aliasreq struct {
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ifra_name [16]byte
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ifra_addr sockaddr_in6
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ifra_dstaddr sockaddr_in6
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ifra_prefixmask sockaddr_in6
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ifra_flags uint32
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ifra_lifetime in6_addrlifetime
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}
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type ifreq struct {
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ifr_name [16]byte
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ifru_mtu uint32
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}
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// Sets the IPv6 address of the utun adapter. On Darwin/macOS this is done using
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// a system socket and making direct syscalls to the kernel.
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func (tun *tunDevice) setupAddress(addr string) error {
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var fd int
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var err error
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if fd, err = unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0); err != nil {
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tun.core.log.Printf("Create AF_SYSTEM socket failed: %v.", err)
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return err
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}
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var ar in6_aliasreq
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copy(ar.ifra_name[:], tun.iface.Name())
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ar.ifra_prefixmask.sin6_len = uint8(unsafe.Sizeof(ar.ifra_prefixmask))
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b := make([]byte, 16)
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binary.LittleEndian.PutUint16(b, uint16(0xFE00))
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ar.ifra_prefixmask.sin6_addr[0] = uint16(binary.BigEndian.Uint16(b))
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ar.ifra_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifra_addr))
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ar.ifra_addr.sin6_family = unix.AF_INET6
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parts := strings.Split(strings.Split(addr, "/")[0], ":")
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for i := 0; i < 8; i++ {
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addr, _ := strconv.ParseUint(parts[i], 16, 16)
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b := make([]byte, 16)
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binary.LittleEndian.PutUint16(b, uint16(addr))
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ar.ifra_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
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}
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ar.ifra_lifetime.ia6t_vltime = 0xFFFFFFFF
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ar.ifra_lifetime.ia6t_pltime = 0xFFFFFFFF
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var ir ifreq
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copy(ir.ifr_name[:], tun.iface.Name())
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ir.ifru_mtu = uint32(tun.mtu)
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tun.core.log.Printf("Interface name: %s", ar.ifra_name)
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tun.core.log.Printf("Interface IPv6: %s", addr)
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tun.core.log.Printf("Interface MTU: %d", ir.ifru_mtu)
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(darwin_SIOCAIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in darwin_SIOCAIFADDR_IN6: %v", errno)
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return err
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}
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(unix.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
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return err
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}
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return err
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}
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