mirror of
https://github.com/tailscale/tailscale.git
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77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
// Copyright (c) 2021 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 netstack
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import (
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"runtime"
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"testing"
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"inet.af/netaddr"
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"tailscale.com/net/packet"
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"tailscale.com/net/tsdial"
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"tailscale.com/net/tstun"
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"tailscale.com/wgengine"
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"tailscale.com/wgengine/filter"
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)
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// TestInjectInboundLeak tests that injectInbound doesn't leak memory.
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// See https://github.com/tailscale/tailscale/issues/3762
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func TestInjectInboundLeak(t *testing.T) {
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tunDev := tstun.NewFake()
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dialer := new(tsdial.Dialer)
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logf := func(format string, args ...any) {
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if !t.Failed() {
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t.Logf(format, args...)
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}
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}
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eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
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Tun: tunDev,
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Dialer: dialer,
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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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defer eng.Close()
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ig, ok := eng.(wgengine.InternalsGetter)
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if !ok {
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t.Fatal("not an InternalsGetter")
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}
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tunWrap, magicSock, ok := ig.GetInternals()
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if !ok {
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t.Fatal("failed to get internals")
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}
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ns, err := Create(logf, tunWrap, eng, magicSock, dialer)
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if err != nil {
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t.Fatal(err)
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}
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defer ns.Close()
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ns.ProcessLocalIPs = true
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if err := ns.Start(); err != nil {
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t.Fatalf("Start: %v", err)
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}
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ns.atomicIsLocalIPFunc.Store(func(netaddr.IP) bool { return true })
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pkt := &packet.Parsed{}
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const N = 10_000
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ms0 := getMemStats()
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for i := 0; i < N; i++ {
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outcome := ns.injectInbound(pkt, tunWrap)
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if outcome != filter.DropSilently {
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t.Fatalf("got outcome %v; want DropSilently", outcome)
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}
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}
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ms1 := getMemStats()
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if grew := int64(ms1.HeapObjects) - int64(ms0.HeapObjects); grew >= N {
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t.Fatalf("grew by %v (which is too much and >= the %v packets we sent)", grew, N)
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}
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}
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func getMemStats() (ms runtime.MemStats) {
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runtime.GC()
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runtime.ReadMemStats(&ms)
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return
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}
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