src/chromiumos/tast/remote/bundles/cros/wifi/duplicate_bssid.go

// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package wifi

import (
	"context"

	"chromiumos/tast/remote/wificell"
	"chromiumos/tast/remote/wificell/hostapd"
	"chromiumos/tast/testing"
)

func init() {
	testing.AddTest(&testing.Test{
		Func: DuplicateBSSID,
		Desc: "Test that two APs with the same BSSID, but with different SSIDs can both be seen in the scan results",
		Contacts: []string{
			"chromeos-wifi-champs@google.com", // WiFi oncall rotation; or http://b/new?component=893827
		},
		Attr:        []string{"group:wificell", "wificell_func"},
		ServiceDeps: []string{wificell.TFServiceName},
		Fixture:     "wificellFixt",
	})
}

func DuplicateBSSID(ctx context.Context, s *testing.State) {
	tf := s.FixtValue().(*wificell.TestFixture)

	// Generate the shared BSSID.
	bssid, err := hostapd.RandomMAC()
	if err != nil {
		s.Fatal("Failed to generate random BSSID: ", err)
	}

	// Configure an AP on the specific channel with given SSID. It returns a shortened
	// ctx, the channel's mapping frequency, a callback to deconfigure the AP and an
	// error object. Note that it directly uses s and tf from the outer scope.
	configureAP := func(ctx context.Context, channel int) (context.Context, *wificell.APIface, func(context.Context), error) {
		s.Logf("Setting up the AP on channel %d", channel)
		options := []hostapd.Option{hostapd.Mode(hostapd.Mode80211nPure), hostapd.Channel(channel), hostapd.HTCaps(hostapd.HTCapHT20), hostapd.BSSID(bssid.String())}
		ap, err := tf.ConfigureAP(ctx, options, nil)
		if err != nil {
			return ctx, nil, nil, err
		}
		sCtx, cancel := tf.ReserveForDeconfigAP(ctx, ap)
		deferFunc := func(ctx context.Context) {
			s.Logf("Deconfiguring the AP on channel %d", channel)
			if err := tf.DeconfigAP(ctx, ap); err != nil {
				s.Error("Failed to deconfig AP: ", err)
			}
			cancel()
		}
		return sCtx, ap, deferFunc, nil
	}

	// Create an AP, manually specifying both the SSID and BSSID.
	// Then create a second AP that responds to probe requests with
	// the same BSSID but a different SSID. These APs together are
	// meant to emulate situations that occur with some types of APs
	// which broadcast or respond with more than one (non-empty) SSID.
	channels := []int{1, 36}
	var aps []*wificell.APIface
	for _, ch := range channels {
		sCtx, ap, deconfig, err := configureAP(ctx, ch)
		if err != nil {
			s.Fatal("Failed to set up AP: ", err)
		}
		defer deconfig(ctx)
		aps = append(aps, ap)
		ctx = sCtx
	}

	for _, ap := range aps {
		if _, err := tf.ConnectWifiAP(ctx, ap); err != nil {
			s.Errorf("Failed to connect to WiFi SSID %s: %v", ap.Config().SSID, err)
			continue
		}
		if err := tf.PingFromDUT(ctx, ap.ServerIP().String()); err != nil {
			s.Error("Failed to ping from the DUT: ", err)
		}
		if err := tf.DisconnectWifi(ctx); err != nil {
			s.Error("Failed to disconnect WiFi: ", err)
		}
	}
}