mirror of
https://github.com/tailscale/tailscale.git
synced 2024-12-05 07:55:36 +00:00
55095df644
If it's in a non-standard table, as it is on Unifi UDM Pro, apparently. Updates #4038 (probably fixes, but don't have hardware to verify) Change-Id: I2cb9a098d8bb07d1a97a6045b686aca31763a937 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
723 lines
21 KiB
Go
723 lines
21 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package interfaces contains helpers for looking up system network interfaces.
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package interfaces
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import (
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"bytes"
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"fmt"
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"net"
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"net/http"
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"runtime"
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"sort"
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"strings"
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"inet.af/netaddr"
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"tailscale.com/hostinfo"
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"tailscale.com/net/tsaddr"
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"tailscale.com/net/tshttpproxy"
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)
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// LoginEndpointForProxyDetermination is the URL used for testing
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// which HTTP proxy the system should use.
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var LoginEndpointForProxyDetermination = "https://controlplane.tailscale.com/"
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// Tailscale returns the current machine's Tailscale interface, if any.
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// If none is found, all zero values are returned.
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// A non-nil error is only returned on a problem listing the system interfaces.
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func Tailscale() ([]netaddr.IP, *net.Interface, error) {
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ifs, err := netInterfaces()
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if err != nil {
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return nil, nil, err
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}
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for _, iface := range ifs {
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if !maybeTailscaleInterfaceName(iface.Name) {
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continue
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}
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addrs, err := iface.Addrs()
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if err != nil {
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continue
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}
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var tsIPs []netaddr.IP
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for _, a := range addrs {
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if ipnet, ok := a.(*net.IPNet); ok {
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nip, ok := netaddr.FromStdIP(ipnet.IP)
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if ok && tsaddr.IsTailscaleIP(nip) {
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tsIPs = append(tsIPs, nip)
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}
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}
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}
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if len(tsIPs) > 0 {
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return tsIPs, iface.Interface, nil
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}
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}
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return nil, nil, nil
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}
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// maybeTailscaleInterfaceName reports whether s is an interface
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// name that might be used by Tailscale.
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func maybeTailscaleInterfaceName(s string) bool {
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return s == "Tailscale" ||
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strings.HasPrefix(s, "wg") ||
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strings.HasPrefix(s, "ts") ||
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strings.HasPrefix(s, "tailscale") ||
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strings.HasPrefix(s, "utun")
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}
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func isUp(nif *net.Interface) bool { return nif.Flags&net.FlagUp != 0 }
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func isLoopback(nif *net.Interface) bool { return nif.Flags&net.FlagLoopback != 0 }
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func isProblematicInterface(nif *net.Interface) bool {
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name := nif.Name
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// Don't try to send disco/etc packets over zerotier; they effectively
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// DoS each other by doing traffic amplification, both of them
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// preferring/trying to use each other for transport. See:
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// https://github.com/tailscale/tailscale/issues/1208
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if strings.HasPrefix(name, "zt") || (runtime.GOOS == "windows" && strings.Contains(name, "ZeroTier")) {
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return true
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}
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return false
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}
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// LocalAddresses returns the machine's IP addresses, separated by
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// whether they're loopback addresses. If there are no regular addresses
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// it will return any IPv4 linklocal or IPv6 unique local addresses because we
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// know of environments where these are used with NAT to provide connectivity.
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func LocalAddresses() (regular, loopback []netaddr.IP, err error) {
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// TODO(crawshaw): don't serve interface addresses that we are routing
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ifaces, err := netInterfaces()
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if err != nil {
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return nil, nil, err
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}
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var regular4, regular6, linklocal4, ula6 []netaddr.IP
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for _, iface := range ifaces {
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stdIf := iface.Interface
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if !isUp(stdIf) || isProblematicInterface(stdIf) {
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// Skip down interfaces and ones that are
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// problematic that we don't want to try to
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// send Tailscale traffic over.
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continue
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}
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ifcIsLoopback := isLoopback(stdIf)
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addrs, err := iface.Addrs()
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if err != nil {
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return nil, nil, err
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}
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for _, a := range addrs {
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switch v := a.(type) {
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case *net.IPNet:
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ip, ok := netaddr.FromStdIP(v.IP)
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if !ok {
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continue
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}
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// TODO(apenwarr): don't special case cgNAT.
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// In the general wireguard case, it might
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// very well be something we can route to
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// directly, because both nodes are
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// behind the same CGNAT router.
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if tsaddr.IsTailscaleIP(ip) {
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continue
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}
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if ip.IsLoopback() || ifcIsLoopback {
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loopback = append(loopback, ip)
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} else if ip.IsLinkLocalUnicast() {
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if ip.Is4() {
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linklocal4 = append(linklocal4, ip)
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}
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// We know of no cases where the IPv6 fe80:: addresses
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// are used to provide WAN connectivity. It is also very
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// common for users to have no IPv6 WAN connectivity,
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// but their OS supports IPv6 so they have an fe80::
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// address. We don't want to report all of those
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// IPv6 LL to Control.
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} else if ip.Is6() && ip.IsPrivate() {
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// Google Cloud Run uses NAT with IPv6 Unique
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// Local Addresses to provide IPv6 connectivity.
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ula6 = append(ula6, ip)
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} else {
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if ip.Is4() {
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regular4 = append(regular4, ip)
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} else {
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regular6 = append(regular6, ip)
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}
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}
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}
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}
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}
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if len(regular4) == 0 && len(regular6) == 0 {
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// if we have no usable IP addresses then be willing to accept
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// addresses we otherwise wouldn't, like:
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// + 169.254.x.x (AWS Lambda uses NAT with these)
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// + IPv6 ULA (Google Cloud Run uses these with address translation)
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if hostinfo.GetEnvType() == hostinfo.AWSLambda {
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regular4 = linklocal4
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}
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regular6 = ula6
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}
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regular = append(regular4, regular6...)
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sortIPs(regular)
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sortIPs(loopback)
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return regular, loopback, nil
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}
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func sortIPs(s []netaddr.IP) {
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sort.Slice(s, func(i, j int) bool { return s[i].Less(s[j]) })
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}
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// Interface is a wrapper around Go's net.Interface with some extra methods.
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type Interface struct {
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*net.Interface
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AltAddrs []net.Addr // if non-nil, returned by Addrs
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Desc string // extra description (used on Windows)
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}
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func (i Interface) IsLoopback() bool { return isLoopback(i.Interface) }
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func (i Interface) IsUp() bool { return isUp(i.Interface) }
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func (i Interface) Addrs() ([]net.Addr, error) {
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if i.AltAddrs != nil {
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return i.AltAddrs, nil
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}
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return i.Interface.Addrs()
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}
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// ForeachInterfaceAddress is a wrapper for GetList, then
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// List.ForeachInterfaceAddress.
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func ForeachInterfaceAddress(fn func(Interface, netaddr.IPPrefix)) error {
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ifaces, err := GetList()
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if err != nil {
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return err
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}
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return ifaces.ForeachInterfaceAddress(fn)
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}
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// ForeachInterfaceAddress calls fn for each interface in ifaces, with
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// all its addresses. The IPPrefix's IP is the IP address assigned to
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// the interface, and Bits are the subnet mask.
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func (ifaces List) ForeachInterfaceAddress(fn func(Interface, netaddr.IPPrefix)) error {
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for _, iface := range ifaces {
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addrs, err := iface.Addrs()
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if err != nil {
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return err
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}
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for _, a := range addrs {
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switch v := a.(type) {
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case *net.IPNet:
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if pfx, ok := netaddr.FromStdIPNet(v); ok {
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fn(iface, pfx)
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}
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}
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}
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}
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return nil
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}
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// ForeachInterface is a wrapper for GetList, then
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// List.ForeachInterface.
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func ForeachInterface(fn func(Interface, []netaddr.IPPrefix)) error {
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ifaces, err := GetList()
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if err != nil {
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return err
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}
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return ifaces.ForeachInterface(fn)
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}
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// ForeachInterface calls fn for each interface in ifaces, with
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// all its addresses. The IPPrefix's IP is the IP address assigned to
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// the interface, and Bits are the subnet mask.
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func (ifaces List) ForeachInterface(fn func(Interface, []netaddr.IPPrefix)) error {
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ifaces, err := GetList()
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if err != nil {
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return err
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}
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for _, iface := range ifaces {
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addrs, err := iface.Addrs()
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if err != nil {
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return err
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}
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var pfxs []netaddr.IPPrefix
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for _, a := range addrs {
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switch v := a.(type) {
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case *net.IPNet:
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if pfx, ok := netaddr.FromStdIPNet(v); ok {
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pfxs = append(pfxs, pfx)
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}
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}
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}
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sort.Slice(pfxs, func(i, j int) bool {
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return pfxs[i].IP().Less(pfxs[j].IP())
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})
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fn(iface, pfxs)
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}
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return nil
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}
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// State is intended to store the state of the machine's network interfaces,
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// routing table, and other network configuration.
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// For now it's pretty basic.
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type State struct {
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// InterfaceIPs maps from an interface name to the IP addresses
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// configured on that interface. Each address is represented as an
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// IPPrefix, where the IP is the interface IP address and Bits is
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// the subnet mask.
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InterfaceIPs map[string][]netaddr.IPPrefix
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Interface map[string]Interface
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// HaveV6 is whether this machine has an IPv6 Global or Unique Local Address
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// which might provide connectivity on a non-Tailscale interface that's up.
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HaveV6 bool
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// HaveV4 is whether the machine has some non-localhost,
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// non-link-local IPv4 address on a non-Tailscale interface that's up.
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HaveV4 bool
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// IsExpensive is whether the current network interface is
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// considered "expensive", which currently means LTE/etc
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// instead of Wifi. This field is not populated by GetState.
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IsExpensive bool
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// DefaultRouteInterface is the interface name for the
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// machine's default route.
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//
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// It is not yet populated on all OSes.
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//
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// When non-empty, its value is the map key into Interface and
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// InterfaceIPs.
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DefaultRouteInterface string
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// HTTPProxy is the HTTP proxy to use, if any.
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HTTPProxy string
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// PAC is the URL to the Proxy Autoconfig URL, if applicable.
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PAC string
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}
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func (s *State) String() string {
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var sb strings.Builder
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fmt.Fprintf(&sb, "interfaces.State{defaultRoute=%v ", s.DefaultRouteInterface)
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if s.DefaultRouteInterface != "" {
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if iface, ok := s.Interface[s.DefaultRouteInterface]; ok && iface.Desc != "" {
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fmt.Fprintf(&sb, "(%s) ", iface.Desc)
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}
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}
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sb.WriteString("ifs={")
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ifs := make([]string, 0, len(s.Interface))
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for k := range s.Interface {
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if anyInterestingIP(s.InterfaceIPs[k]) {
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ifs = append(ifs, k)
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}
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}
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sort.Slice(ifs, func(i, j int) bool {
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upi, upj := s.Interface[ifs[i]].IsUp(), s.Interface[ifs[j]].IsUp()
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if upi != upj {
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// Up sorts before down.
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return upi
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}
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return ifs[i] < ifs[j]
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})
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for i, ifName := range ifs {
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if i > 0 {
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sb.WriteString(" ")
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}
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if s.Interface[ifName].IsUp() {
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fmt.Fprintf(&sb, "%s:[", ifName)
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needSpace := false
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for _, pfx := range s.InterfaceIPs[ifName] {
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if !isInterestingIP(pfx.IP()) {
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continue
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}
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if needSpace {
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sb.WriteString(" ")
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}
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fmt.Fprintf(&sb, "%s", pfx)
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needSpace = true
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}
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sb.WriteString("]")
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} else {
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fmt.Fprintf(&sb, "%s:down", ifName)
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}
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}
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sb.WriteString("}")
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if s.IsExpensive {
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sb.WriteString(" expensive")
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}
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if s.HTTPProxy != "" {
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fmt.Fprintf(&sb, " httpproxy=%s", s.HTTPProxy)
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}
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if s.PAC != "" {
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fmt.Fprintf(&sb, " pac=%s", s.PAC)
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}
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fmt.Fprintf(&sb, " v4=%v v6=%v}", s.HaveV4, s.HaveV6)
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return sb.String()
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}
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// An InterfaceFilter indicates whether EqualFiltered should use i when deciding whether two States are equal.
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// ips are all the IPPrefixes associated with i.
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type InterfaceFilter func(i Interface, ips []netaddr.IPPrefix) bool
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// An IPFilter indicates whether EqualFiltered should use ip when deciding whether two States are equal.
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// ip is an ip address associated with some interface under consideration.
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type IPFilter func(ip netaddr.IP) bool
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// EqualFiltered reports whether s and s2 are equal,
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// considering only interfaces in s for which filter returns true,
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// and considering only IPs for those interfaces for which filterIP returns true.
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func (s *State) EqualFiltered(s2 *State, useInterface InterfaceFilter, useIP IPFilter) bool {
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if s == nil && s2 == nil {
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return true
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}
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if s == nil || s2 == nil {
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return false
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}
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if s.HaveV6 != s2.HaveV6 ||
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s.HaveV4 != s2.HaveV4 ||
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s.IsExpensive != s2.IsExpensive ||
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s.DefaultRouteInterface != s2.DefaultRouteInterface ||
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s.HTTPProxy != s2.HTTPProxy ||
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s.PAC != s2.PAC {
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return false
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}
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for iname, i := range s.Interface {
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ips := s.InterfaceIPs[iname]
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if !useInterface(i, ips) {
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continue
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}
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i2, ok := s2.Interface[iname]
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if !ok {
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return false
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}
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ips2, ok := s2.InterfaceIPs[iname]
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if !ok {
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return false
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}
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if !interfacesEqual(i, i2) || !prefixesEqualFiltered(ips, ips2, useIP) {
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return false
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}
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}
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return true
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}
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func interfacesEqual(a, b Interface) bool {
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return a.Index == b.Index &&
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a.MTU == b.MTU &&
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a.Name == b.Name &&
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a.Flags == b.Flags &&
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bytes.Equal([]byte(a.HardwareAddr), []byte(b.HardwareAddr))
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}
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func filteredIPPs(ipps []netaddr.IPPrefix, useIP IPFilter) []netaddr.IPPrefix {
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// TODO: rewrite prefixesEqualFiltered to avoid making copies
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x := make([]netaddr.IPPrefix, 0, len(ipps))
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for _, ipp := range ipps {
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if useIP(ipp.IP()) {
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x = append(x, ipp)
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}
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}
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return x
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}
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func prefixesEqualFiltered(a, b []netaddr.IPPrefix, useIP IPFilter) bool {
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return prefixesEqual(filteredIPPs(a, useIP), filteredIPPs(b, useIP))
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}
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func prefixesEqual(a, b []netaddr.IPPrefix) bool {
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if len(a) != len(b) {
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return false
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}
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for i, v := range a {
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if b[i] != v {
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return false
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}
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}
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return true
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}
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// UseInterestingInterfaces is an InterfaceFilter that reports whether i is an interesting interface.
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// An interesting interface if it is (a) not owned by Tailscale and (b) routes interesting IP addresses.
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// See UseInterestingIPs for the defition of an interesting IP address.
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func UseInterestingInterfaces(i Interface, ips []netaddr.IPPrefix) bool {
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return !isTailscaleInterface(i.Name, ips) && anyInterestingIP(ips)
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}
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// UseInterestingIPs is an IPFilter that reports whether ip is an interesting IP address.
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// An IP address is interesting if it is neither a lopback not a link local unicast IP address.
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func UseInterestingIPs(ip netaddr.IP) bool {
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return isInterestingIP(ip)
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}
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// UseAllInterfaces is an InterfaceFilter that includes all interfaces.
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func UseAllInterfaces(i Interface, ips []netaddr.IPPrefix) bool { return true }
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// UseAllIPs is an IPFilter that includes all all IPs.
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func UseAllIPs(ips netaddr.IP) bool { return true }
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func (s *State) HasPAC() bool { return s != nil && s.PAC != "" }
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// AnyInterfaceUp reports whether any interface seems like it has Internet access.
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func (s *State) AnyInterfaceUp() bool {
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if runtime.GOOS == "js" {
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return true
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}
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return s != nil && (s.HaveV4 || s.HaveV6)
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}
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func hasTailscaleIP(pfxs []netaddr.IPPrefix) bool {
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for _, pfx := range pfxs {
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if tsaddr.IsTailscaleIP(pfx.IP()) {
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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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func isTailscaleInterface(name string, ips []netaddr.IPPrefix) bool {
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if runtime.GOOS == "darwin" && strings.HasPrefix(name, "utun") && hasTailscaleIP(ips) {
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// On macOS in the sandboxed app (at least as of
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// 2021-02-25), we often see two utun devices
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// (e.g. utun4 and utun7) with the same IPv4 and IPv6
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// addresses. Just remove all utun devices with
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// Tailscale IPs until we know what's happening with
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// macOS NetworkExtensions and utun devices.
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return true
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}
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return name == "Tailscale" || // as it is on Windows
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strings.HasPrefix(name, "tailscale") // TODO: use --tun flag value, etc; see TODO in method doc
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}
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// getPAC, if non-nil, returns the current PAC file URL.
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var getPAC func() string
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// GetState returns the state of all the current machine's network interfaces.
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//
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// It does not set the returned State.IsExpensive. The caller can populate that.
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func GetState() (*State, error) {
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s := &State{
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InterfaceIPs: make(map[string][]netaddr.IPPrefix),
|
|
Interface: make(map[string]Interface),
|
|
}
|
|
if err := ForeachInterface(func(ni Interface, pfxs []netaddr.IPPrefix) {
|
|
ifUp := ni.IsUp()
|
|
s.Interface[ni.Name] = ni
|
|
s.InterfaceIPs[ni.Name] = append(s.InterfaceIPs[ni.Name], pfxs...)
|
|
if !ifUp || isTailscaleInterface(ni.Name, pfxs) {
|
|
return
|
|
}
|
|
for _, pfx := range pfxs {
|
|
if pfx.IP().IsLoopback() {
|
|
continue
|
|
}
|
|
s.HaveV6 = s.HaveV6 || isUsableV6(pfx.IP())
|
|
s.HaveV4 = s.HaveV4 || isUsableV4(pfx.IP())
|
|
}
|
|
}); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
dr, _ := DefaultRoute()
|
|
s.DefaultRouteInterface = dr.InterfaceName
|
|
|
|
// Populate description (for Windows, primarily) if present.
|
|
if desc := dr.InterfaceDesc; desc != "" {
|
|
if iface, ok := s.Interface[dr.InterfaceName]; ok {
|
|
iface.Desc = desc
|
|
s.Interface[dr.InterfaceName] = iface
|
|
}
|
|
}
|
|
|
|
if s.AnyInterfaceUp() {
|
|
req, err := http.NewRequest("GET", LoginEndpointForProxyDetermination, nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if u, err := tshttpproxy.ProxyFromEnvironment(req); err == nil && u != nil {
|
|
s.HTTPProxy = u.String()
|
|
}
|
|
if getPAC != nil {
|
|
s.PAC = getPAC()
|
|
}
|
|
}
|
|
|
|
return s, nil
|
|
}
|
|
|
|
// HTTPOfListener returns the HTTP address to ln.
|
|
// If the listener is listening on the unspecified address, it
|
|
// it tries to find a reasonable interface address on the machine to use.
|
|
func HTTPOfListener(ln net.Listener) string {
|
|
ta, ok := ln.Addr().(*net.TCPAddr)
|
|
if !ok || !ta.IP.IsUnspecified() {
|
|
return fmt.Sprintf("http://%v/", ln.Addr())
|
|
}
|
|
|
|
var goodIP string
|
|
var privateIP string
|
|
ForeachInterfaceAddress(func(i Interface, pfx netaddr.IPPrefix) {
|
|
ip := pfx.IP()
|
|
if ip.IsPrivate() {
|
|
if privateIP == "" {
|
|
privateIP = ip.String()
|
|
}
|
|
return
|
|
}
|
|
goodIP = ip.String()
|
|
})
|
|
if privateIP != "" {
|
|
goodIP = privateIP
|
|
}
|
|
if goodIP != "" {
|
|
return fmt.Sprintf("http://%v/", net.JoinHostPort(goodIP, fmt.Sprint(ta.Port)))
|
|
}
|
|
return fmt.Sprintf("http://localhost:%v/", fmt.Sprint(ta.Port))
|
|
|
|
}
|
|
|
|
var likelyHomeRouterIP func() (netaddr.IP, bool)
|
|
|
|
// LikelyHomeRouterIP returns the likely IP of the residential router,
|
|
// which will always be an IPv4 private address, if found.
|
|
// In addition, it returns the IP address of the current machine on
|
|
// the LAN using that gateway.
|
|
// This is used as the destination for UPnP, NAT-PMP, PCP, etc queries.
|
|
func LikelyHomeRouterIP() (gateway, myIP netaddr.IP, ok bool) {
|
|
if likelyHomeRouterIP != nil {
|
|
gateway, ok = likelyHomeRouterIP()
|
|
if !ok {
|
|
return
|
|
}
|
|
}
|
|
if !ok {
|
|
return
|
|
}
|
|
ForeachInterfaceAddress(func(i Interface, pfx netaddr.IPPrefix) {
|
|
ip := pfx.IP()
|
|
if !i.IsUp() || ip.IsZero() || !myIP.IsZero() {
|
|
return
|
|
}
|
|
if gateway.IsPrivate() && ip.IsPrivate() {
|
|
myIP = ip
|
|
ok = true
|
|
return
|
|
}
|
|
})
|
|
return gateway, myIP, !myIP.IsZero()
|
|
}
|
|
|
|
// isUsableV4 reports whether ip is a usable IPv4 address which could
|
|
// conceivably be used to get Internet connectivity. Globally routable and
|
|
// private IPv4 addresses are always Usable, and link local 169.254.x.x
|
|
// addresses are in some environments.
|
|
func isUsableV4(ip netaddr.IP) bool {
|
|
if !ip.Is4() || ip.IsLoopback() {
|
|
return false
|
|
}
|
|
if ip.IsLinkLocalUnicast() {
|
|
return hostinfo.GetEnvType() == hostinfo.AWSLambda
|
|
}
|
|
return true
|
|
}
|
|
|
|
// isUsableV6 reports whether ip is a usable IPv6 address which could
|
|
// conceivably be used to get Internet connectivity. Globally routable
|
|
// IPv6 addresses are always Usable, and Unique Local Addresses
|
|
// (fc00::/7) are in some environments used with address translation.
|
|
func isUsableV6(ip netaddr.IP) bool {
|
|
return v6Global1.Contains(ip) ||
|
|
(ip.Is6() && ip.IsPrivate() && !tsaddr.TailscaleULARange().Contains(ip))
|
|
}
|
|
|
|
var (
|
|
v6Global1 = netaddr.MustParseIPPrefix("2000::/3")
|
|
)
|
|
|
|
// anyInterestingIP reports whether pfxs contains any IP that matches
|
|
// isInterestingIP.
|
|
func anyInterestingIP(pfxs []netaddr.IPPrefix) bool {
|
|
for _, pfx := range pfxs {
|
|
if isInterestingIP(pfx.IP()) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
// isInterestingIP reports whether ip is an interesting IP that we
|
|
// should log in interfaces.State logging. We don't need to show
|
|
// localhost or link-local addresses.
|
|
func isInterestingIP(ip netaddr.IP) bool {
|
|
return !ip.IsLoopback() && !ip.IsLinkLocalUnicast()
|
|
}
|
|
|
|
var altNetInterfaces func() ([]Interface, error)
|
|
|
|
// RegisterInterfaceGetter sets the function that's used to query
|
|
// the system network interfaces.
|
|
func RegisterInterfaceGetter(getInterfaces func() ([]Interface, error)) {
|
|
altNetInterfaces = getInterfaces
|
|
}
|
|
|
|
// List is a list of interfaces on the machine.
|
|
type List []Interface
|
|
|
|
// GetList returns the list of interfaces on the machine.
|
|
func GetList() (List, error) {
|
|
return netInterfaces()
|
|
}
|
|
|
|
// netInterfaces is a wrapper around the standard library's net.Interfaces
|
|
// that returns a []*Interface instead of a []net.Interface.
|
|
// It exists because Android SDK 30 no longer permits Go's net.Interfaces
|
|
// to work (Issue 2293); this wrapper lets us the Android app register
|
|
// an alternate implementation.
|
|
func netInterfaces() ([]Interface, error) {
|
|
if altNetInterfaces != nil {
|
|
return altNetInterfaces()
|
|
}
|
|
ifs, err := net.Interfaces()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
ret := make([]Interface, len(ifs))
|
|
for i := range ifs {
|
|
ret[i].Interface = &ifs[i]
|
|
}
|
|
return ret, nil
|
|
}
|
|
|
|
// DefaultRouteDetails are the details about a default route returned
|
|
// by DefaultRoute.
|
|
type DefaultRouteDetails struct {
|
|
// InterfaceName is the interface name. It must always be populated.
|
|
// It's like "eth0" (Linux), "Ethernet 2" (Windows), "en0" (macOS).
|
|
InterfaceName string
|
|
|
|
// InterfaceDesc is populated on Windows at least. It's a
|
|
// longer description, like "Red Hat VirtIO Ethernet Adapter".
|
|
InterfaceDesc string
|
|
|
|
// InterfaceIndex is like net.Interface.Index.
|
|
// Zero means not populated.
|
|
InterfaceIndex int
|
|
|
|
// TODO(bradfitz): break this out into v4-vs-v6 once that need arises.
|
|
}
|
|
|
|
// DefaultRouteInterface is like DefaultRoute but only returns the
|
|
// interface name.
|
|
func DefaultRouteInterface() (string, error) {
|
|
dr, err := DefaultRoute()
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return dr.InterfaceName, nil
|
|
}
|
|
|
|
// DefaultRoute returns details of the network interface that owns
|
|
// the default route, not including any tailscale interfaces.
|
|
func DefaultRoute() (DefaultRouteDetails, error) {
|
|
return defaultRoute()
|
|
}
|