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https://github.com/tailscale/tailscale.git
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b9adbe2002
In prep for most of the package funcs in net/interfaces to become methods in a long-lived netmon.Monitor that can cache things. (Many of the funcs are very heavy to call regularly, whereas the long-lived netmon.Monitor can subscribe to things from the OS and remember answers to questions it's asked regularly later) Updates tailscale/corp#10910 Updates tailscale/corp#18960 Updates #7967 Updates #3299 Change-Id: Ie4e8dedb70136af2d611b990b865a822cd1797e5 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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package netmon
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import (
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"errors"
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"fmt"
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"io/fs"
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"os"
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"path/filepath"
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"testing"
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"tailscale.com/tstest"
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)
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// test the specific /proc/net/route path as found on Google Cloud Run instances
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func TestGoogleCloudRunDefaultRouteInterface(t *testing.T) {
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dir := t.TempDir()
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tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "CloudRun"))
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buf := []byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n" +
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"eth0\t8008FEA9\t00000000\t0001\t0\t0\t0\t01FFFFFF\t0\t0\t0\n" +
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"eth1\t00000000\t00000000\t0001\t0\t0\t0\t00000000\t0\t0\t0\n")
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err := os.WriteFile(procNetRoutePath, buf, 0644)
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if err != nil {
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t.Fatal(err)
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}
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got, err := DefaultRouteInterface()
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if err != nil {
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t.Fatal(err)
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}
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if got != "eth1" {
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t.Fatalf("got %s, want eth1", got)
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}
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}
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// we read chunks of /proc/net/route at a time, test that files longer than the chunk
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// size can be handled.
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func TestExtremelyLongProcNetRoute(t *testing.T) {
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dir := t.TempDir()
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tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "VeryLong"))
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f, err := os.Create(procNetRoutePath)
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if err != nil {
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t.Fatal(err)
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}
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_, err = f.Write([]byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n"))
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if err != nil {
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t.Fatal(err)
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}
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for n := 0; n <= 900; n++ {
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line := fmt.Sprintf("eth%d\t8008FEA9\t00000000\t0001\t0\t0\t0\t01FFFFFF\t0\t0\t0\n", n)
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_, err := f.Write([]byte(line))
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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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_, err = f.Write([]byte("tokenring1\t00000000\t00000000\t0001\t0\t0\t0\t00000000\t0\t0\t0\n"))
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if err != nil {
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t.Fatal(err)
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}
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got, err := DefaultRouteInterface()
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if err != nil {
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t.Fatal(err)
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}
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if got != "tokenring1" {
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t.Fatalf("got %q, want tokenring1", got)
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}
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}
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// test the specific /proc/net/route path as found on AWS App Runner instances
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func TestAwsAppRunnerDefaultRouteInterface(t *testing.T) {
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dir := t.TempDir()
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tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "CloudRun"))
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buf := []byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n" +
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"eth0\t00000000\tF9AFFEA9\t0003\t0\t0\t0\t00000000\t0\t0\t0\n" +
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"*\tFEA9FEA9\t00000000\t0005\t0\t0\t0\tFFFFFFFF\t0\t0\t0\n" +
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"ecs-eth0\t02AAFEA9\t01ACFEA9\t0007\t0\t0\t0\tFFFFFFFF\t0\t0\t0\n" +
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"ecs-eth0\t00ACFEA9\t00000000\t0001\t0\t0\t0\t00FFFFFF\t0\t0\t0\n" +
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"eth0\t00AFFEA9\t00000000\t0001\t0\t0\t0\t00FFFFFF\t0\t0\t0\n")
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err := os.WriteFile(procNetRoutePath, buf, 0644)
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if err != nil {
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t.Fatal(err)
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}
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got, err := DefaultRouteInterface()
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if err != nil {
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t.Fatal(err)
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}
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if got != "eth0" {
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t.Fatalf("got %s, want eth0", got)
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}
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}
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func BenchmarkDefaultRouteInterface(b *testing.B) {
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b.ReportAllocs()
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for range b.N {
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if _, err := DefaultRouteInterface(); err != nil {
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b.Fatal(err)
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}
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}
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}
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func TestRouteLinuxNetlink(t *testing.T) {
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d, err := defaultRouteFromNetlink()
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if errors.Is(err, fs.ErrPermission) {
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t.Skip(err)
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}
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if err != nil {
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t.Fatal(err)
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}
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t.Logf("Got: %+v", d)
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}
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