107 lines
2.9 KiB
Go
107 lines
2.9 KiB
Go
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// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package hostinfo
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import (
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"log"
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"net"
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"runtime"
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"strings"
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"unicode"
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"tailscale.com/envknob"
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)
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// TODO(bradfitz): this is all too simplistic and static. It needs to run
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// continuously in response to netmon events (USB ethernet adapaters might get
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// plugged in) and look for the media type/status/etc. Right now on macOS it
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// still detects a half dozen "up" en0, en1, en2, en3 etc interfaces that don't
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// have any media. We should only report the one that's actually connected.
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// But it works for now (2023-10-05) for fleshing out the rest.
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var wakeMAC = envknob.RegisterString("TS_WAKE_MAC") // mac address, "false" or "auto". for https://github.com/tailscale/tailscale/issues/306
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// getWoLMACs returns up to 10 MAC address of the local machine to send
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// wake-on-LAN packets to in order to wake it up. The returned MACs are in
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// lowercase hex colon-separated form ("xx:xx:xx:xx:xx:xx").
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//
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// If TS_WAKE_MAC=auto, it tries to automatically find the MACs based on the OS
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// type and interface properties. (TODO(bradfitz): incomplete) If TS_WAKE_MAC is
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// set to a MAC address, that sole MAC address is returned.
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func getWoLMACs() (macs []string) {
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switch runtime.GOOS {
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case "ios", "android":
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return nil
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}
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if s := wakeMAC(); s != "" {
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switch s {
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case "auto":
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ifs, _ := net.Interfaces()
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for _, iface := range ifs {
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if iface.Flags&net.FlagLoopback != 0 {
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continue
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}
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if iface.Flags&net.FlagBroadcast == 0 ||
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iface.Flags&net.FlagRunning == 0 ||
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iface.Flags&net.FlagUp == 0 {
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continue
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}
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if keepMAC(iface.Name, iface.HardwareAddr) {
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macs = append(macs, iface.HardwareAddr.String())
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}
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if len(macs) == 10 {
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break
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}
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}
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return macs
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case "false", "off": // fast path before ParseMAC error
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return nil
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}
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mac, err := net.ParseMAC(s)
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if err != nil {
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log.Printf("invalid MAC %q", s)
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return nil
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}
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return []string{mac.String()}
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}
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return nil
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}
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var ignoreWakeOUI = map[[3]byte]bool{
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{0x00, 0x15, 0x5d}: true, // Hyper-V
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{0x00, 0x50, 0x56}: true, // VMware
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{0x00, 0x1c, 0x14}: true, // VMware
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{0x00, 0x05, 0x69}: true, // VMware
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{0x00, 0x0c, 0x29}: true, // VMware
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{0x00, 0x1c, 0x42}: true, // Parallels
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{0x08, 0x00, 0x27}: true, // VirtualBox
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{0x00, 0x21, 0xf6}: true, // VirtualBox
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{0x00, 0x14, 0x4f}: true, // VirtualBox
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{0x00, 0x0f, 0x4b}: true, // VirtualBox
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{0x52, 0x54, 0x00}: true, // VirtualBox/Vagrant
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}
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func keepMAC(ifName string, mac []byte) bool {
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if len(mac) != 6 {
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return false
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}
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base := strings.TrimRightFunc(ifName, unicode.IsNumber)
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switch runtime.GOOS {
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case "darwin":
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switch base {
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case "llw", "awdl", "utun", "bridge", "lo", "gif", "stf", "anpi", "ap":
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return false
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}
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}
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if mac[0] == 0x02 && mac[1] == 0x42 {
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// Docker container.
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return false
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}
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oui := [3]byte{mac[0], mac[1], mac[2]}
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if ignoreWakeOUI[oui] {
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return false
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}
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return true
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}
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