115 lines
2.7 KiB
Go
115 lines
2.7 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package interfaces
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import (
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"errors"
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"io"
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"net/netip"
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"os/exec"
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"testing"
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"go4.org/mem"
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"tailscale.com/util/lineread"
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"tailscale.com/version"
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)
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func TestLikelyHomeRouterIPSyscallExec(t *testing.T) {
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syscallIP, _, syscallOK := likelyHomeRouterIPBSDFetchRIB()
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netstatIP, netstatIf, netstatOK := likelyHomeRouterIPDarwinExec()
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if syscallOK != netstatOK || syscallIP != netstatIP {
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t.Errorf("syscall() = %v, %v, netstat = %v, %v",
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syscallIP, syscallOK,
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netstatIP, netstatOK,
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)
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}
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if !syscallOK {
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return
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}
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def, err := defaultRoute()
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if err != nil {
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t.Errorf("defaultRoute() error: %v", err)
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}
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if def.InterfaceName != netstatIf {
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t.Errorf("syscall default route interface %s differs from netstat %s", def.InterfaceName, netstatIf)
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}
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}
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/*
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Parse out 10.0.0.1 and en0 from:
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$ netstat -r -n -f inet
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Routing tables
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Internet:
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Destination Gateway Flags Netif Expire
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default 10.0.0.1 UGSc en0
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default link#14 UCSI utun2
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10/16 link#4 UCS en0 !
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10.0.0.1/32 link#4 UCS en0 !
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...
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*/
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func likelyHomeRouterIPDarwinExec() (ret netip.Addr, netif string, ok bool) {
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if version.IsMobile() {
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// Don't try to do subprocesses on iOS. Ends up with log spam like:
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// kernel: "Sandbox: IPNExtension(86580) deny(1) process-fork"
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// This is why we have likelyHomeRouterIPDarwinSyscall.
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return ret, "", false
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}
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cmd := exec.Command("/usr/sbin/netstat", "-r", "-n", "-f", "inet")
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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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defer io.Copy(io.Discard, stdout) // clear the pipe to prevent hangs
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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("default")) {
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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) < 4 || !f[0].EqualString("default") {
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return nil
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}
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ipm, flagsm, netifm := f[1], f[2], f[3]
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if !mem.Contains(flagsm, mem.S("G")) {
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return nil
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}
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if mem.Contains(flagsm, mem.S("I")) {
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return nil
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}
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ip, err := netip.ParseAddr(string(mem.Append(nil, ipm)))
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if err == nil && ip.IsPrivate() {
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ret = ip
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netif = netifm.StringCopy()
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// We've found what we're looking for.
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return errStopReadingNetstatTable
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}
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return nil
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})
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return ret, netif, ret.IsValid()
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}
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func TestFetchRoutingTable(t *testing.T) {
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// Issue 1345: this used to be flaky on darwin.
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for i := 0; i < 20; i++ {
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_, err := fetchRoutingTable()
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if err != nil {
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t.Fatal(err)
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}
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}
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}
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var errStopReadingNetstatTable = errors.New("found private gateway")
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