mirror of
https://github.com/yggdrasil-network/yggdrasil-go
synced 2024-09-20 17:40:25 +03:00
136 lines
3.7 KiB
Go
136 lines
3.7 KiB
Go
// +build openbsd
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package yggdrasil
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import "os/exec"
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import "unsafe"
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import "syscall"
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import "golang.org/x/sys/unix"
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import water "github.com/neilalexander/water"
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// This is to catch OpenBSD
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// TODO: Fix TUN mode for OpenBSD. It turns out that OpenBSD doesn't have a way
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// to disable the PI header when in TUN mode, so we need to modify the read/
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// writes to handle those first four bytes
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// Warning! When porting this to other BSDs, the tuninfo struct can appear with
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// the fields in a different order, and the consts below might also have
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// different values
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type tuninfo struct {
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tun_mtu uint16
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tun_type uint32
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tun_flags uint32
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tun_dummy uint16
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}
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const TUNSIFINFO = (0x80000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 91
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const TUNGIFINFO = (0x40000000) | ((12 & 0x1fff) << 16) | uint32(byte('t'))<<8 | 92
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const SIOCAIFADDR_IN6 = (0x80000000) | ((4 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 27
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// Below this point seems to be fairly standard at least...
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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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func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
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var config water.Config
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if ifname[:4] == "auto" {
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ifname = "/dev/tap0"
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}
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if len(ifname) < 9 {
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panic("TUN/TAP name must be in format /dev/tunX or /dev/tapX")
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}
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switch {
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case iftapmode || ifname[:8] == "/dev/tap":
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config = water.Config{DeviceType: water.TAP}
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case !iftapmode || ifname[:8] == "/dev/tun":
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// config = water.Config{DeviceType: water.TUN}
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panic("TUN mode is not currently supported on OpenBSD, please use TAP instead")
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default:
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panic("TUN/TAP name must be in format /dev/tunX or /dev/tapX")
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}
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config.Name = ifname
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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 = mtu //1280 // Lets default to the smallest thing allowed for now
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return tun.setupAddress(addr)
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}
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func (tun *tunDevice) setupAddress(addr string) error {
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fd := tun.iface.FD().Fd()
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var err error
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var ti tuninfo
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tun.core.log.Printf("Interface name: %s", tun.iface.Name())
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tun.core.log.Printf("Interface IPv6: %s", addr)
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tun.core.log.Printf("Interface MTU: %d", tun.mtu)
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// Get the existing interface flags
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNGIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in TUNGIFINFO: %v", errno)
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return err
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}
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//tun.core.log.Printf("TUNGIFINFO: %+v", ti)
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// Set the new MTU
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ti.tun_mtu = uint16(tun.mtu)
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// Set the new interface flags
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ti.tun_flags |= syscall.IFF_UP
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switch {
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case tun.iface.IsTAP():
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ti.tun_flags |= syscall.IFF_MULTICAST
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ti.tun_flags |= syscall.IFF_BROADCAST
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case tun.iface.IsTUN():
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ti.tun_flags |= syscall.IFF_POINTOPOINT
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}
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// Set the new interface flags
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//tun.core.log.Printf("TUNSIFINFO: %+v", ti)
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if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(fd), uintptr(TUNSIFINFO), uintptr(unsafe.Pointer(&ti))); errno != 0 {
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err = errno
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tun.core.log.Printf("Error in TUNSIFINFO: %v", errno)
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return err
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}
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// Set address
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cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
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//tun.core.log.Printf("ifconfig command: %v", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.core.log.Printf("ifconfig failed: %v.", err)
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tun.core.log.Println(string(output))
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}
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return nil
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}
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