hostap/tests/hwsim/test_scan.py

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# Scanning tests
# Copyright (c) 2013, Jouni Malinen <j@w1.fi>
#
# This software may be distributed under the terms of the BSD license.
# See README for more details.
import time
import logging
logger = logging.getLogger()
import subprocess
import hostapd
def check_scan(dev, params, other_started=False):
if not other_started:
dev.dump_monitor()
id = dev.request("SCAN " + params)
if "FAIL" in id:
raise Exception("Failed to start scan")
id = int(id)
if other_started:
ev = dev.wait_event(["CTRL-EVENT-SCAN-STARTED"])
if ev is None:
raise Exception("Other scan did not start")
if "id=" + str(id) in ev:
raise Exception("Own scan id unexpectedly included in start event")
ev = dev.wait_event(["CTRL-EVENT-SCAN-RESULTS"])
if ev is None:
raise Exception("Other scan did not complete")
if "id=" + str(id) in ev:
raise Exception("Own scan id unexpectedly included in completed event")
ev = dev.wait_event(["CTRL-EVENT-SCAN-STARTED"])
if ev is None:
raise Exception("Scan did not start")
if "id=" + str(id) not in ev:
raise Exception("Scan id not included in start event")
ev = dev.wait_event(["CTRL-EVENT-SCAN-RESULTS"])
if ev is None:
raise Exception("Scan did not complete")
if "id=" + str(id) not in ev:
raise Exception("Scan id not included in completed event")
def test_scan(dev, apdev):
"""Control interface behavior on scan parameters"""
hostapd.add_ap(apdev[0]['ifname'], { "ssid": "test-scan" })
bssid = apdev[0]['bssid']
logger.info("Full scan")
check_scan(dev[0], "use_id=1")
logger.info("Limited channel scan")
check_scan(dev[0], "freq=2412-2462,5180 use_id=1")
if int(dev[0].get_bss(bssid)['age']) > 1:
raise Exception("Unexpectedly old BSS entry")
# wait long enough to allow next scans to be verified not to find the AP
time.sleep(2)
logger.info("Passive single-channel scan")
check_scan(dev[0], "freq=2457 passive=1 use_id=1")
logger.info("Active single-channel scan")
check_scan(dev[0], "freq=2452 passive=0 use_id=1")
if int(dev[0].get_bss(bssid)['age']) < 2:
raise Exception("Unexpectedly updated BSS entry")
logger.info("Active single-channel scan on AP's operating channel")
check_scan(dev[0], "freq=2412 passive=0 use_id=1")
if int(dev[0].get_bss(bssid)['age']) > 1:
raise Exception("Unexpectedly old BSS entry")
def test_scan_only(dev, apdev):
"""Control interface behavior on scan parameters with type=only"""
hostapd.add_ap(apdev[0]['ifname'], { "ssid": "test-scan" })
bssid = apdev[0]['bssid']
logger.info("Full scan")
check_scan(dev[0], "type=only use_id=1")
logger.info("Limited channel scan")
check_scan(dev[0], "type=only freq=2412-2462,5180 use_id=1")
if int(dev[0].get_bss(bssid)['age']) > 1:
raise Exception("Unexpectedly old BSS entry")
# wait long enough to allow next scans to be verified not to find the AP
time.sleep(2)
logger.info("Passive single-channel scan")
check_scan(dev[0], "type=only freq=2457 passive=1 use_id=1")
logger.info("Active single-channel scan")
check_scan(dev[0], "type=only freq=2452 passive=0 use_id=1")
if int(dev[0].get_bss(bssid)['age']) < 2:
raise Exception("Unexpectedly updated BSS entry")
logger.info("Active single-channel scan on AP's operating channel")
check_scan(dev[0], "type=only freq=2412 passive=0 use_id=1")
if int(dev[0].get_bss(bssid)['age']) > 1:
raise Exception("Unexpectedly old BSS entry")
def test_scan_external_trigger(dev, apdev):
"""Avoid operations during externally triggered scan"""
hostapd.add_ap(apdev[0]['ifname'], { "ssid": "test-scan" })
bssid = apdev[0]['bssid']
subprocess.call(['sudo', 'iw', dev[0].ifname, 'scan', 'trigger'])
check_scan(dev[0], "use_id=1", other_started=True)
def test_scan_bss_expiration_count(dev, apdev):
"""BSS entry expiration based on scan results without match"""
if "FAIL" not in dev[0].request("BSS_EXPIRE_COUNT 0"):
raise Exception("Invalid BSS_EXPIRE_COUNT accepted")
if "OK" not in dev[0].request("BSS_EXPIRE_COUNT 2"):
raise Exception("BSS_EXPIRE_COUNT failed")
hapd = hostapd.add_ap(apdev[0]['ifname'], { "ssid": "test-scan" })
bssid = apdev[0]['bssid']
dev[0].scan(freq="2412", only_new=True)
if bssid not in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS not found in initial scan")
hapd.request("DISABLE")
dev[0].scan(freq="2412", only_new=True)
if bssid not in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS not found in first scan without match")
dev[0].scan(freq="2412", only_new=True)
if bssid in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS found after two scans without match")
def test_scan_bss_expiration_age(dev, apdev):
"""BSS entry expiration based on age"""
try:
if "FAIL" not in dev[0].request("BSS_EXPIRE_AGE COUNT 9"):
raise Exception("Invalid BSS_EXPIRE_AGE accepted")
if "OK" not in dev[0].request("BSS_EXPIRE_AGE 10"):
raise Exception("BSS_EXPIRE_AGE failed")
hapd = hostapd.add_ap(apdev[0]['ifname'], { "ssid": "test-scan" })
bssid = apdev[0]['bssid']
dev[0].scan(freq="2412")
if bssid not in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS not found in initial scan")
hapd.request("DISABLE")
logger.info("Waiting for BSS entry to expire")
time.sleep(7)
if bssid not in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS expired too quickly")
ev = dev[0].wait_event(["CTRL-EVENT-BSS-REMOVED"], timeout=15)
if ev is None:
raise Exception("BSS entry expiration timed out")
if bssid in dev[0].request("SCAN_RESULTS"):
raise Exception("BSS not removed after expiration time")
finally:
dev[0].request("BSS_EXPIRE_AGE 180")