mirror of
https://github.com/cwinfo/yggdrasil-go.git
synced 2024-11-10 19:10:27 +00:00
Configure addresses and MTUs, fix bugs
This commit is contained in:
Neil Alexander
parent
f5517acc81
commit
235b64345e
@ -40,8 +40,8 @@ func (w *tunWriter) _write(b []byte) {
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}
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})
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}
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if written-TUN_OFFSET_BYTES != n {
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w.tun.log.Errorln("TUN iface write mismatch:", written-TUN_OFFSET_BYTES, "bytes written vs", n, "bytes given")
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if written != n {
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w.tun.log.Errorln("TUN iface write mismatch:", written, "bytes written vs", n, "bytes given")
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}
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}
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@ -1,70 +1,223 @@
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package tuntap
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import (
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"bytes"
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"errors"
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"fmt"
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"os/exec"
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"log"
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"net"
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"runtime"
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"strings"
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"time"
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"unsafe"
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"golang.org/x/sys/windows"
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wgtun "golang.zx2c4.com/wireguard/tun"
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"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
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)
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// This is to catch Windows platforms
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// Configures the TUN adapter with the correct IPv6 address and MTU.
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func (tun *TunAdapter) setup(ifname string, addr string, mtu int) error {
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iface, err := wgtun.CreateTUN(ifname, mtu)
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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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if mtu, err := iface.MTU(); err == nil {
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tun.mtu = getSupportedMTU(mtu)
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} else {
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tun.mtu = 0
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}
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return tun.setupAddress(addr)
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var err error
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err = doAsSystem(func() {
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iface, err := wgtun.CreateTUN(ifname, mtu)
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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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if err := tun.setupAddress(addr); err != nil {
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tun.log.Errorln("Failed to set up TUN address:", err)
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}
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if err := tun.setupMTU(getSupportedMTU(mtu)); err != nil {
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tun.log.Errorln("Failed to set up TUN MTU:", err)
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}
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if mtu, err = iface.MTU(); err == nil {
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tun.mtu = mtu
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}
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})
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return err
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}
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// Sets the MTU of the TAP adapter.
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func (tun *TunAdapter) setupMTU(mtu int) error {
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if tun.iface == nil || tun.iface.Name() == "" {
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return errors.New("Can't configure MTU as TAP adapter is not present")
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if tun.iface == nil || tun.Name() == "" {
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return errors.New("Can't configure MTU as TUN adapter is not present")
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}
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// Set MTU
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cmd := exec.Command("netsh", "interface", "ipv6", "set", "subinterface",
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fmt.Sprintf("interface=%s", tun.iface.Name()),
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fmt.Sprintf("mtu=%d", mtu),
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"store=active")
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tun.log.Debugln("netsh command:", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.log.Errorln("Windows netsh failed:", err)
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tun.log.Traceln(string(output))
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return err
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if intf, ok := tun.iface.(*wgtun.NativeTun); ok {
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luid := winipcfg.LUID(intf.LUID())
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ipfamily, err := luid.IPInterface(windows.AF_INET6)
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if err != nil {
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return err
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}
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ipfamily.NLMTU = uint32(mtu)
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intf.ForceMTU(int(ipfamily.NLMTU))
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ipfamily.UseAutomaticMetric = false
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ipfamily.Metric = 0
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ipfamily.DadTransmits = 0
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ipfamily.RouterDiscoveryBehavior = winipcfg.RouterDiscoveryDisabled
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if err := ipfamily.Set(); err != nil {
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return err
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}
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}
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time.Sleep(time.Second) // FIXME artifical delay to give netsh time to take effect
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return nil
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}
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// Sets the IPv6 address of the TAP adapter.
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func (tun *TunAdapter) setupAddress(addr string) error {
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if tun.iface == nil || tun.iface.Name() == "" {
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return errors.New("Can't configure IPv6 address as TAP adapter is not present")
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if tun.iface == nil || tun.Name() == "" {
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return errors.New("Can't configure IPv6 address as TUN adapter is not present")
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}
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// Set address
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cmd := exec.Command("netsh", "interface", "ipv6", "add", "address",
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fmt.Sprintf("interface=%s", tun.iface.Name()),
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fmt.Sprintf("addr=%s", addr),
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"store=active")
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tun.log.Debugln("netsh command:", strings.Join(cmd.Args, " "))
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output, err := cmd.CombinedOutput()
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if err != nil {
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tun.log.Errorln("Windows netsh failed:", err)
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tun.log.Traceln(string(output))
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return err
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if intf, ok := tun.iface.(*wgtun.NativeTun); ok {
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if ipaddr, ipnet, err := net.ParseCIDR(addr); err == nil {
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luid := winipcfg.LUID(intf.LUID())
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addresses := append([]net.IPNet{}, net.IPNet{
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IP: ipaddr,
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Mask: ipnet.Mask,
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})
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err := luid.SetIPAddressesForFamily(windows.AF_INET6, addresses)
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if err == windows.ERROR_OBJECT_ALREADY_EXISTS {
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cleanupAddressesOnDisconnectedInterfaces(windows.AF_INET6, addresses)
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err = luid.SetIPAddressesForFamily(windows.AF_INET6, addresses)
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}
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if err != nil {
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return err
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}
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} else {
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return err
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}
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} else {
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return errors.New("unable to get NativeTUN")
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}
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time.Sleep(time.Second) // FIXME artifical delay to give netsh time to take effect
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return nil
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}
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/*
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* doAsSystem
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* SPDX-License-Identifier: LGPL-3.0
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* Copyright (C) 2017-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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func doAsSystem(f func()) error {
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runtime.LockOSThread()
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defer func() {
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windows.RevertToSelf()
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runtime.UnlockOSThread()
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}()
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privileges := windows.Tokenprivileges{
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PrivilegeCount: 1,
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Privileges: [1]windows.LUIDAndAttributes{
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{
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Attributes: windows.SE_PRIVILEGE_ENABLED,
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},
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},
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}
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err := windows.LookupPrivilegeValue(nil, windows.StringToUTF16Ptr("SeDebugPrivilege"), &privileges.Privileges[0].Luid)
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if err != nil {
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return err
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}
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err = windows.ImpersonateSelf(windows.SecurityImpersonation)
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if err != nil {
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return err
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}
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var threadToken windows.Token
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err = windows.OpenThreadToken(windows.CurrentThread(), windows.TOKEN_ADJUST_PRIVILEGES, false, &threadToken)
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if err != nil {
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return err
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}
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defer threadToken.Close()
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err = windows.AdjustTokenPrivileges(threadToken, false, &privileges, uint32(unsafe.Sizeof(privileges)), nil, nil)
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if err != nil {
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return err
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}
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processes, err := windows.CreateToolhelp32Snapshot(windows.TH32CS_SNAPPROCESS, 0)
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if err != nil {
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return err
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}
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defer windows.CloseHandle(processes)
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processEntry := windows.ProcessEntry32{Size: uint32(unsafe.Sizeof(windows.ProcessEntry32{}))}
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pid := uint32(0)
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for err = windows.Process32First(processes, &processEntry); err == nil; err = windows.Process32Next(processes, &processEntry) {
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if strings.ToLower(windows.UTF16ToString(processEntry.ExeFile[:])) == "winlogon.exe" {
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pid = processEntry.ProcessID
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break
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}
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}
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if pid == 0 {
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return errors.New("unable to find winlogon.exe process")
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}
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winlogonProcess, err := windows.OpenProcess(windows.PROCESS_QUERY_INFORMATION, false, pid)
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if err != nil {
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return err
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}
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defer windows.CloseHandle(winlogonProcess)
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var winlogonToken windows.Token
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err = windows.OpenProcessToken(winlogonProcess, windows.TOKEN_IMPERSONATE|windows.TOKEN_DUPLICATE, &winlogonToken)
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if err != nil {
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return err
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}
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defer winlogonToken.Close()
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var duplicatedToken windows.Token
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err = windows.DuplicateTokenEx(winlogonToken, 0, nil, windows.SecurityImpersonation, windows.TokenImpersonation, &duplicatedToken)
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if err != nil {
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return err
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}
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defer duplicatedToken.Close()
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err = windows.SetThreadToken(nil, duplicatedToken)
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if err != nil {
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return err
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}
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f()
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return nil
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}
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/*
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* cleanupAddressesOnDisconnectedInterfaces
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* SPDX-License-Identifier: MIT
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* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
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*/
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func cleanupAddressesOnDisconnectedInterfaces(family winipcfg.AddressFamily, addresses []net.IPNet) {
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if len(addresses) == 0 {
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return
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}
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includedInAddresses := func(a net.IPNet) bool {
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// TODO: this makes the whole algorithm O(n^2). But we can't stick net.IPNet in a Go hashmap. Bummer!
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for _, addr := range addresses {
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ip := addr.IP
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if ip4 := ip.To4(); ip4 != nil {
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ip = ip4
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}
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mA, _ := addr.Mask.Size()
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mB, _ := a.Mask.Size()
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if bytes.Equal(ip, a.IP) && mA == mB {
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return true
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}
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}
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return false
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}
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interfaces, err := winipcfg.GetAdaptersAddresses(family, winipcfg.GAAFlagDefault)
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if err != nil {
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return
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}
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for _, iface := range interfaces {
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if iface.OperStatus == winipcfg.IfOperStatusUp {
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continue
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}
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for address := iface.FirstUnicastAddress; address != nil; address = address.Next {
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ip := address.Address.IP()
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ipnet := net.IPNet{IP: ip, Mask: net.CIDRMask(int(address.OnLinkPrefixLength), 8*len(ip))}
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if includedInAddresses(ipnet) {
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log.Printf("Cleaning up stale address %s from interface ‘%s’", ipnet.String(), iface.FriendlyName())
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iface.LUID.DeleteIPAddress(ipnet)
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}
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}
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}
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}
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