mirror of
https://github.com/tailscale/tailscale.git
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72 lines
2.0 KiB
Go
72 lines
2.0 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
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import (
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"os/exec"
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"go4.org/mem"
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"inet.af/netaddr"
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"tailscale.com/util/lineread"
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)
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func init() {
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likelyHomeRouterIP = likelyHomeRouterIPWindows
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}
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/*
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Parse out 10.0.0.1 from:
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Z:\>route print -4
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===========================================================================
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Interface List
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15...aa 15 48 ff 1c 72 ......Red Hat VirtIO Ethernet Adapter
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5...........................Tailscale Tunnel
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1...........................Software Loopback Interface 1
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===========================================================================
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IPv4 Route Table
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===========================================================================
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Active Routes:
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Network Destination Netmask Gateway Interface Metric
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0.0.0.0 0.0.0.0 10.0.0.1 10.0.28.63 5
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10.0.0.0 255.255.0.0 On-link 10.0.28.63 261
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10.0.28.63 255.255.255.255 On-link 10.0.28.63 261
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10.0.42.0 255.255.255.0 100.103.42.106 100.103.42.106 5
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10.0.255.255 255.255.255.255 On-link 10.0.28.63 261
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34.193.248.174 255.255.255.255 100.103.42.106 100.103.42.106 5
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*/
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func likelyHomeRouterIPWindows() (ret netaddr.IP, ok bool) {
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cmd := exec.Command("route", "print", "-4")
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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return
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}
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if err := cmd.Start(); err != nil {
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return
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}
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defer cmd.Wait()
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var f []mem.RO
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lineread.Reader(stdout, func(lineb []byte) error {
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line := mem.B(lineb)
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if !mem.Contains(line, mem.S("0.0.0.0")) {
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return nil
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}
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f = mem.AppendFields(f[:0], line)
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if len(f) < 3 || !f[0].EqualString("0.0.0.0") || !f[1].EqualString("0.0.0.0") {
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return nil
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}
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ipm := f[2]
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ip, err := netaddr.ParseIP(string(mem.Append(nil, ipm)))
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if err == nil && isPrivateIP(ip) {
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ret = ip
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}
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return nil
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})
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return ret, !ret.IsZero()
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}
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