yggdrasil-go/src/yggdrasil/tun_bsd.go

172 lines
4.8 KiB
Go
Raw Normal View History

// +build openbsd freebsd netbsd
package yggdrasil
2018-06-13 01:50:08 +03:00
import (
"encoding/binary"
"os/exec"
"strconv"
"strings"
"syscall"
"unsafe"
2018-03-04 19:56:46 +03:00
2018-06-13 01:50:08 +03:00
"golang.org/x/sys/unix"
2018-06-13 01:50:08 +03:00
"github.com/yggdrasil-network/water"
)
const SIOCSIFADDR_IN6 = (0x80000000) | ((288 & 0x1fff) << 16) | uint32(byte('i'))<<8 | 12
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
}
/*
from <netinet6/in6_var.h>
struct in6_ifreq {
277 char ifr_name[IFNAMSIZ];
278 union {
279 struct sockaddr_in6 ifru_addr;
280 struct sockaddr_in6 ifru_dstaddr;
281 int ifru_flags;
282 int ifru_flags6;
283 int ifru_metric;
284 caddr_t ifru_data;
285 struct in6_addrlifetime ifru_lifetime;
286 struct in6_ifstat ifru_stat;
287 struct icmp6_ifstat ifru_icmp6stat;
288 u_int32_t ifru_scope_id[16];
289 } ifr_ifru;
290 };
*/
type in6_ifreq_mtu struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_mtu int
}
type in6_ifreq_addr struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_addr sockaddr_in6
}
type in6_ifreq_flags struct {
ifr_name [syscall.IFNAMSIZ]byte
flags int
}
type in6_ifreq_lifetime struct {
ifr_name [syscall.IFNAMSIZ]byte
ifru_addrlifetime in6_addrlifetime
}
2018-06-13 00:45:53 +03:00
// Sets the IPv6 address of the utun adapter. On all BSD platforms (FreeBSD,
// OpenBSD, NetBSD) an attempt is made to set the adapter properties by using
// a system socket and making syscalls to the kernel. This is not refined though
// and often doesn't work (if at all), therefore if a call fails, it resorts
2018-06-13 01:50:08 +03:00
// to calling "ifconfig" instead.
func (tun *tunDevice) setup(ifname string, iftapmode bool, addr string, mtu int) error {
var config water.Config
if ifname[:4] == "auto" {
ifname = "/dev/tap0"
}
if len(ifname) < 9 {
panic("TUN/TAP name must be in format /dev/tunX or /dev/tapX")
}
switch {
case iftapmode || ifname[:8] == "/dev/tap":
config = water.Config{DeviceType: water.TAP}
case !iftapmode || ifname[:8] == "/dev/tun":
panic("TUN mode is not currently supported on this platform, please use TAP instead")
default:
panic("TUN/TAP name must be in format /dev/tunX or /dev/tapX")
}
config.Name = ifname
iface, err := water.New(config)
if err != nil {
panic(err)
}
tun.iface = iface
tun.mtu = getSupportedMTU(mtu)
return tun.setupAddress(addr)
}
func (tun *tunDevice) setupAddress(addr string) error {
var sfd int
var err error
// Create system socket
if sfd, err = unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, 0); err != nil {
tun.core.log.Printf("Create AF_INET socket failed: %v.", err)
return err
}
// Friendly output
tun.core.log.Printf("Interface name: %s", tun.iface.Name())
tun.core.log.Printf("Interface IPv6: %s", addr)
tun.core.log.Printf("Interface MTU: %d", tun.mtu)
// Create the MTU request
var ir in6_ifreq_mtu
copy(ir.ifr_name[:], tun.iface.Name())
ir.ifru_mtu = int(tun.mtu)
// Set the MTU
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
err = errno
tun.core.log.Printf("Error in SIOCSIFMTU: %v", errno)
// Fall back to ifconfig to set the MTU
cmd := exec.Command("ifconfig", tun.iface.Name(), "mtu", string(tun.mtu))
tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("SIOCSIFMTU fallback failed: %v.", err)
tun.core.log.Println(string(output))
}
}
// Create the address request
// FIXME: I don't work!
var ar in6_ifreq_addr
copy(ar.ifr_name[:], tun.iface.Name())
ar.ifru_addr.sin6_len = uint8(unsafe.Sizeof(ar.ifru_addr))
ar.ifru_addr.sin6_family = unix.AF_INET6
parts := strings.Split(strings.Split(addr, "/")[0], ":")
for i := 0; i < 8; i++ {
addr, _ := strconv.ParseUint(parts[i], 16, 16)
b := make([]byte, 16)
binary.LittleEndian.PutUint16(b, uint16(addr))
ar.ifru_addr.sin6_addr[i] = uint16(binary.BigEndian.Uint16(b))
}
// Set the interface address
if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(SIOCSIFADDR_IN6), uintptr(unsafe.Pointer(&ar))); errno != 0 {
err = errno
tun.core.log.Printf("Error in SIOCSIFADDR_IN6: %v", errno)
// Fall back to ifconfig to set the address
cmd := exec.Command("ifconfig", tun.iface.Name(), "inet6", addr)
tun.core.log.Printf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
output, err := cmd.CombinedOutput()
if err != nil {
tun.core.log.Printf("SIOCSIFADDR_IN6 fallback failed: %v.", err)
tun.core.log.Println(string(output))
}
}
return nil
}