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2703d6916f
When turned on via environment variable (off by default), this will use the BSD routing APIs to query what interface index a socket should be bound to, rather than binding to the default interface in all cases. Updates #5719 Updates #5940 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ib4c919471f377b7a08cd3413f8e8caacb29fee0b
86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
// Copyright (c) 2023 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 netns
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import (
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"testing"
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"tailscale.com/net/interfaces"
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)
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func TestGetInterfaceIndex(t *testing.T) {
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oldVal := bindToInterfaceByRoute.Load()
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t.Cleanup(func() { bindToInterfaceByRoute.Store(oldVal) })
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bindToInterfaceByRoute.Store(true)
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tests := []struct {
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name string
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addr string
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err string
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}{
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{
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name: "IP_and_port",
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addr: "8.8.8.8:53",
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},
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{
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name: "bare_ip",
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addr: "8.8.8.8",
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},
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{
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name: "invalid",
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addr: "!!!!!",
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},
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}
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for _, tc := range tests {
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t.Run(tc.name, func(t *testing.T) {
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idx, err := getInterfaceIndex(t.Logf, tc.addr)
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if err != nil {
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if tc.err == "" {
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t.Fatalf("got unexpected error: %v", err)
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}
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if errstr := err.Error(); errstr != tc.err {
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t.Errorf("expected error %q, got %q", errstr, tc.err)
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}
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} else {
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t.Logf("getInterfaceIndex(%q) = %d", tc.addr, idx)
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if tc.err != "" {
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t.Fatalf("wanted error %q", tc.err)
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}
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if idx < 0 {
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t.Fatalf("got invalid index %d", idx)
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}
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}
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})
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}
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t.Run("NoTailscale", func(t *testing.T) {
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_, tsif, err := interfaces.Tailscale()
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if err != nil {
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t.Fatal(err)
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}
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if tsif == nil {
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t.Skip("no tailscale interface on this machine")
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}
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defaultIdx, err := interfaces.DefaultRouteInterfaceIndex()
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if err != nil {
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t.Fatal(err)
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}
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idx, err := getInterfaceIndex(t.Logf, "100.100.100.100:53")
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if err != nil {
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t.Fatal(err)
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}
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t.Logf("tailscaleIdx=%d defaultIdx=%d idx=%d", tsif.Index, defaultIdx, idx)
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if idx == tsif.Index {
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t.Fatalf("got idx=%d; wanted not Tailscale interface", idx)
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} else if idx != defaultIdx {
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t.Fatalf("got idx=%d, want %d", idx, defaultIdx)
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}
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})
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}
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