// Copyright (c) Tailscale Inc & AUTHORS // SPDX-License-Identifier: BSD-3-Clause package netns import ( "testing" "tailscale.com/net/interfaces" ) func TestGetInterfaceIndex(t *testing.T) { oldVal := bindToInterfaceByRoute.Load() t.Cleanup(func() { bindToInterfaceByRoute.Store(oldVal) }) bindToInterfaceByRoute.Store(true) tests := []struct { name string addr string err string }{ { name: "IP_and_port", addr: "8.8.8.8:53", }, { name: "bare_ip", addr: "8.8.8.8", }, { name: "invalid", addr: "!!!!!", }, } for _, tc := range tests { t.Run(tc.name, func(t *testing.T) { idx, err := getInterfaceIndex(t.Logf, nil, tc.addr) if err != nil { if tc.err == "" { t.Fatalf("got unexpected error: %v", err) } if errstr := err.Error(); errstr != tc.err { t.Errorf("expected error %q, got %q", errstr, tc.err) } } else { t.Logf("getInterfaceIndex(%q) = %d", tc.addr, idx) if tc.err != "" { t.Fatalf("wanted error %q", tc.err) } if idx < 0 { t.Fatalf("got invalid index %d", idx) } } }) } t.Run("NoTailscale", func(t *testing.T) { tsif, err := tailscaleInterface() if err != nil { t.Fatal(err) } if tsif == nil { t.Skip("no tailscale interface on this machine") } defaultIdx, err := interfaces.DefaultRouteInterfaceIndex() if err != nil { t.Fatal(err) } idx, err := getInterfaceIndex(t.Logf, nil, "100.100.100.100:53") if err != nil { t.Fatal(err) } t.Logf("tailscaleIdx=%d defaultIdx=%d idx=%d", tsif.Index, defaultIdx, idx) if idx == tsif.Index { t.Fatalf("got idx=%d; wanted not Tailscale interface", idx) } else if idx != defaultIdx { t.Fatalf("got idx=%d, want %d", idx, defaultIdx) } }) }