tailscale/net/interfaces/interfaces_linux_test.go

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// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package interfaces
import (
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"testing"
"tailscale.com/tstest"
)
// test the specific /proc/net/route path as found on Google Cloud Run instances
func TestGoogleCloudRunDefaultRouteInterface(t *testing.T) {
dir := t.TempDir()
tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "CloudRun"))
buf := []byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n" +
"eth0\t8008FEA9\t00000000\t0001\t0\t0\t0\t01FFFFFF\t0\t0\t0\n" +
"eth1\t00000000\t00000000\t0001\t0\t0\t0\t00000000\t0\t0\t0\n")
err := os.WriteFile(procNetRoutePath, buf, 0644)
if err != nil {
t.Fatal(err)
}
got, err := DefaultRouteInterface()
if err != nil {
t.Fatal(err)
}
if got != "eth1" {
t.Fatalf("got %s, want eth1", got)
}
}
// we read chunks of /proc/net/route at a time, test that files longer than the chunk
// size can be handled.
func TestExtremelyLongProcNetRoute(t *testing.T) {
dir := t.TempDir()
tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "VeryLong"))
f, err := os.Create(procNetRoutePath)
if err != nil {
t.Fatal(err)
}
_, err = f.Write([]byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n"))
if err != nil {
t.Fatal(err)
}
for n := 0; n <= 900; n++ {
line := fmt.Sprintf("eth%d\t8008FEA9\t00000000\t0001\t0\t0\t0\t01FFFFFF\t0\t0\t0\n", n)
_, err := f.Write([]byte(line))
if err != nil {
t.Fatal(err)
}
}
_, err = f.Write([]byte("tokenring1\t00000000\t00000000\t0001\t0\t0\t0\t00000000\t0\t0\t0\n"))
if err != nil {
t.Fatal(err)
}
got, err := DefaultRouteInterface()
if err != nil {
t.Fatal(err)
}
if got != "tokenring1" {
t.Fatalf("got %q, want tokenring1", got)
}
}
// test the specific /proc/net/route path as found on AWS App Runner instances
func TestAwsAppRunnerDefaultRouteInterface(t *testing.T) {
dir := t.TempDir()
tstest.Replace(t, &procNetRoutePath, filepath.Join(dir, "CloudRun"))
buf := []byte("Iface\tDestination\tGateway\tFlags\tRefCnt\tUse\tMetric\tMask\tMTU\tWindow\tIRTT\n" +
"eth0\t00000000\tF9AFFEA9\t0003\t0\t0\t0\t00000000\t0\t0\t0\n" +
"*\tFEA9FEA9\t00000000\t0005\t0\t0\t0\tFFFFFFFF\t0\t0\t0\n" +
"ecs-eth0\t02AAFEA9\t01ACFEA9\t0007\t0\t0\t0\tFFFFFFFF\t0\t0\t0\n" +
"ecs-eth0\t00ACFEA9\t00000000\t0001\t0\t0\t0\t00FFFFFF\t0\t0\t0\n" +
"eth0\t00AFFEA9\t00000000\t0001\t0\t0\t0\t00FFFFFF\t0\t0\t0\n")
err := os.WriteFile(procNetRoutePath, buf, 0644)
if err != nil {
t.Fatal(err)
}
got, err := DefaultRouteInterface()
if err != nil {
t.Fatal(err)
}
if got != "eth0" {
t.Fatalf("got %s, want eth0", got)
}
}
func BenchmarkDefaultRouteInterface(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
if _, err := DefaultRouteInterface(); err != nil {
b.Fatal(err)
}
}
}
func TestRouteLinuxNetlink(t *testing.T) {
d, err := defaultRouteFromNetlink()
if errors.Is(err, fs.ErrPermission) {
t.Skip(err)
}
if err != nil {
t.Fatal(err)
}
t.Logf("Got: %+v", d)
}