| #!/usr/bin/python |
| |
| """Manages a device's wired and wireless connections to the LAN.""" |
| |
| import collections |
| import errno |
| import glob |
| import json |
| import logging |
| import os |
| import random |
| import re |
| import subprocess |
| import time |
| |
| # This is in site-packages on the device, but not when running tests, and so |
| # raises lint errors. |
| # pylint: disable=g-bad-import-order |
| import pyinotify |
| |
| import cycler |
| import interface |
| import iw |
| import status |
| |
| |
| class FileChangeHandler(pyinotify.ProcessEvent): |
| """Connects pyinotify events to ConnectionManager.""" |
| |
| def __init__(self, connection_manager, *args, **kwargs): |
| self._connection_manager = connection_manager |
| super(FileChangeHandler, self).__init__(*args, **kwargs) |
| |
| def process_IN_DELETE(self, event): |
| self._connection_manager.handle_event(event.path, event.name, True) |
| |
| def process_IN_CLOSE_WRITE(self, event): |
| self._connection_manager.handle_event(event.path, event.name, False) |
| |
| def process_IN_MOVED_TO(self, event): |
| self.process_IN_CLOSE_WRITE(event) |
| |
| def process_IN_MOVED_FROM(self, event): |
| self.process_IN_DELETE(event) |
| |
| def check_events(self, *args, **kwargs): |
| result = super(FileChangeHandler, self).check_events(*args, **kwargs) |
| return result |
| |
| |
| class WLANConfiguration(object): |
| """Represents a WLAN configuration from cwmpd.""" |
| |
| WIFI_STOPAP = ['wifi', 'stopap', '--persist'] |
| WIFI_SETCLIENT = ['wifi', 'setclient', '--persist'] |
| WIFI_STOPCLIENT = ['wifi', 'stopclient', '--persist'] |
| |
| def __init__(self, band, wifi, command_lines, _status, wpa_control_interface): |
| self.band = band |
| self.wifi = wifi |
| self.command = command_lines.splitlines() |
| self.access_point_up = False |
| self.ssid = None |
| self.passphrase = None |
| self.interface_suffix = None |
| self.access_point = None |
| self._status = _status |
| self._wpa_control_interface = wpa_control_interface |
| |
| binwifi_option_attrs = { |
| '-s': 'ssid', |
| '--ssid': 'ssid', |
| '-S': 'interface_suffix', |
| '--interface_suffix': 'interface_suffix', |
| } |
| attr = None |
| for line in self.command: |
| if attr is not None: |
| setattr(self, attr, line) |
| attr = None |
| continue |
| |
| attr = binwifi_option_attrs.get(line, None) |
| |
| if line.startswith('WIFI_PSK='): |
| self.passphrase = line.split('WIFI_PSK=')[-1] |
| |
| if self.ssid is None: |
| raise ValueError('Command file does not specify SSID') |
| |
| if self.wifi.initial_ssid == self.ssid: |
| logging.debug('Connected to WLAN at startup') |
| |
| @property |
| def client_up(self): |
| wpa_status = self.wifi.wpa_status() |
| return (wpa_status.get('wpa_state') == 'COMPLETED' |
| and wpa_status.get('ssid') == self.ssid) |
| |
| def start_access_point(self): |
| """Start an access point.""" |
| |
| if not self.access_point or self.access_point_up: |
| return |
| |
| # Since we only run an access point if we have a wired connection anyway, we |
| # don't want to constrain the AP's channel to the channel of the AP we are |
| # connected to. This line should go away when we have wireless repeaters. |
| self.stop_client() |
| |
| try: |
| subprocess.check_output(self.command, stderr=subprocess.STDOUT) |
| self.access_point_up = True |
| logging.debug('Started %s GHz AP', self.band) |
| except subprocess.CalledProcessError as e: |
| logging.error('Failed to start access point: %s', e.output) |
| |
| def stop_access_point(self): |
| if not self.access_point_up: |
| return |
| |
| command = self.WIFI_STOPAP + ['--band', self.band] |
| if self.interface_suffix: |
| command += ['--interface_suffix', self.interface_suffix] |
| |
| try: |
| subprocess.check_output(command, stderr=subprocess.STDOUT) |
| self.access_point_up = False |
| logging.debug('Stopped %s GHz AP', self.band) |
| except subprocess.CalledProcessError as e: |
| logging.error('Failed to stop access point: %s', e.output) |
| return |
| |
| def start_client(self): |
| """Join the WLAN as a client.""" |
| up = self.client_up |
| if up: |
| logging.debug('Wifi client already started on %s GHz', self.band) |
| return |
| |
| command = self.WIFI_SETCLIENT + ['--ssid', self.ssid, '--band', self.band] |
| env = dict(os.environ) |
| if self.passphrase: |
| env['WIFI_CLIENT_PSK'] = self.passphrase |
| try: |
| self._status.trying_wlan = True |
| subprocess.check_output(command, stderr=subprocess.STDOUT, env=env) |
| except subprocess.CalledProcessError as e: |
| logging.error('Failed to start wifi client: %s', e.output) |
| return |
| |
| self._status.connected_to_wlan = True |
| logging.info('Started wifi client on %s GHz', self.band) |
| self.wifi.attach_wpa_control(self._wpa_control_interface) |
| |
| def stop_client(self): |
| if not self.client_up: |
| logging.debug('Wifi client already stopped on %s GHz', self.band) |
| return |
| |
| self.wifi.detach_wpa_control() |
| |
| try: |
| subprocess.check_output(self.WIFI_STOPCLIENT + ['-b', self.band], |
| stderr=subprocess.STDOUT) |
| # TODO(rofrankel): Make this work for dual-radio devices. |
| self._status.connected_to_wlan = False |
| logging.debug('Stopped wifi client on %s GHz', self.band) |
| except subprocess.CalledProcessError as e: |
| logging.error('Failed to stop wifi client: %s', e.output) |
| |
| |
| class ConnectionManager(object): |
| """Manages wired and wireless connections to the LAN.""" |
| |
| # pylint: disable=invalid-name |
| Bridge = interface.Bridge |
| Wifi = interface.Wifi |
| FrenzyWifi = interface.FrenzyWifi |
| WLANConfiguration = WLANConfiguration |
| |
| ETHERNET_STATUS_FILE = 'eth0' |
| WLAN_FILE_REGEXP_FMT = r'^%s((?P<interface_suffix>.*)\.)?(?P<band>2\.4|5)$' |
| COMMAND_FILE_PREFIX = 'command.' |
| ACCESS_POINT_FILE_PREFIX = 'access_point.' |
| COMMAND_FILE_REGEXP = WLAN_FILE_REGEXP_FMT % COMMAND_FILE_PREFIX |
| ACCESS_POINT_FILE_REGEXP = WLAN_FILE_REGEXP_FMT % ACCESS_POINT_FILE_PREFIX |
| GATEWAY_FILE_PREFIX = 'gateway.' |
| MOCA_NODE_FILE_PREFIX = 'node' |
| WIFI_SETCLIENT = ['wifi', 'setclient'] |
| IFUP = ['ifup'] |
| IP_LINK = ['ip', 'link'] |
| IFPLUGD_ACTION = ['/etc/ifplugd/ifplugd.action'] |
| BINWIFI = ['wifi'] |
| |
| def __init__(self, |
| bridge_interface='br0', |
| tmp_dir='/tmp/conman', |
| config_dir='/config/conman', |
| moca_tmp_dir='/tmp/cwmp/monitoring/moca2', |
| wpa_control_interface='/var/run/wpa_supplicant', |
| run_duration_s=1, interface_update_period=5, |
| wifi_scan_period_s=120, wlan_retry_s=15, acs_update_wait_s=10, |
| bssid_cycle_length_s=30): |
| |
| self._tmp_dir = tmp_dir |
| self._config_dir = config_dir |
| self._interface_status_dir = os.path.join(tmp_dir, 'interfaces') |
| self._status_dir = os.path.join(tmp_dir, 'status') |
| self._moca_tmp_dir = moca_tmp_dir |
| self._wpa_control_interface = wpa_control_interface |
| self._run_duration_s = run_duration_s |
| self._interface_update_period = interface_update_period |
| self._wifi_scan_period_s = wifi_scan_period_s |
| self._wlan_retry_s = wlan_retry_s |
| self._acs_update_wait_s = acs_update_wait_s |
| self._bssid_cycle_length_s = bssid_cycle_length_s |
| self._wlan_configuration = {} |
| |
| # Make sure all necessary directories exist. |
| for directory in (self._tmp_dir, self._config_dir, self._moca_tmp_dir, |
| self._interface_status_dir, self._moca_tmp_dir): |
| if not os.path.exists(directory): |
| os.makedirs(directory) |
| logging.info('Created monitored directory: %s', directory) |
| |
| acs_autoprov_filepath = os.path.join(self._tmp_dir, |
| 'acs_autoprovisioning') |
| self.bridge = self.Bridge( |
| bridge_interface, '10', |
| acs_autoprovisioning_filepath=acs_autoprov_filepath) |
| |
| self.create_wifi_interfaces() |
| |
| self._status = status.Status(self._status_dir) |
| |
| wm = pyinotify.WatchManager() |
| wm.add_watch(self._config_dir, |
| pyinotify.IN_CLOSE_WRITE | pyinotify.IN_MOVED_TO | |
| pyinotify.IN_DELETE | pyinotify.IN_MOVED_FROM) |
| wm.add_watch(self._tmp_dir, |
| pyinotify.IN_CLOSE_WRITE | pyinotify.IN_MOVED_TO) |
| wm.add_watch(self._interface_status_dir, |
| pyinotify.IN_CLOSE_WRITE | pyinotify.IN_MOVED_TO) |
| wm.add_watch(self._moca_tmp_dir, |
| pyinotify.IN_CLOSE_WRITE | pyinotify.IN_MOVED_TO) |
| self.notifier = pyinotify.Notifier(wm, FileChangeHandler(self), timeout=0) |
| |
| # If the ethernet file doesn't exist for any reason when conman starts, |
| # check explicitly and run ifplugd.action to create the file. |
| if not os.path.exists(os.path.join(self._interface_status_dir, 'eth0')): |
| ethernet_up = self.is_interface_up('eth0') |
| self.ifplugd_action('eth0', ethernet_up) |
| self.bridge.ethernet = ethernet_up |
| |
| # Do the same for wifi interfaces , but rather than explicitly setting that |
| # the wpa_supplicant link is up, attempt to attach to the wpa_supplicant |
| # control interface. |
| for wifi in self.wifi: |
| if not os.path.exists( |
| os.path.join(self._interface_status_dir, wifi.name)): |
| wifi_up = self.is_interface_up(wifi.name) |
| self.ifplugd_action(wifi.name, wifi_up) |
| if wifi_up: |
| self._status.attached_to_wpa_supplicant = wifi.attach_wpa_control( |
| self._wpa_control_interface) |
| |
| for path, prefix in ((self._tmp_dir, self.GATEWAY_FILE_PREFIX), |
| (self._interface_status_dir, ''), |
| (self._moca_tmp_dir, self.MOCA_NODE_FILE_PREFIX), |
| (self._config_dir, self.COMMAND_FILE_PREFIX)): |
| for filepath in glob.glob(os.path.join(path, prefix + '*')): |
| self._process_file(path, os.path.split(filepath)[-1]) |
| |
| # Make sure no unwanted APs or clients are running. |
| for wifi in self.wifi: |
| for band in wifi.bands: |
| config = self._wlan_configuration.get(band, None) |
| if config: |
| if config.access_point: |
| # If we have a config and want an AP, we don't want a client. |
| self._stop_wifi(band, False, True) |
| else: |
| # If we have a config but don't want an AP, make sure we aren't |
| # running one. |
| self._stop_wifi(band, True, False) |
| break |
| else: |
| # If we have no config for this radio, neither a client nor an AP should |
| # be running. |
| self._stop_wifi(wifi.bands[0], True, True) |
| |
| # Now that we've read any existing state, it's okay to let interfaces touch |
| # the routing table. |
| for ifc in [self.bridge] + self.wifi: |
| ifc.initialize() |
| logging.debug('%s initialized', ifc.name) |
| |
| self._interface_update_counter = 0 |
| self._try_wlan_after = {'5': 0, '2.4': 0} |
| |
| def create_wifi_interfaces(self): |
| """Create Wifi interfaces.""" |
| |
| # If we have multiple client interfaces, 5 GHz-only < both < 2.4 GHz-only. |
| def metric_for_bands(bands): |
| if '5' in bands: |
| if '2.4' in bands: |
| return interface.METRIC_24GHZ_5GHZ |
| return interface.METRIC_5GHZ |
| return interface.METRIC_24GHZ |
| |
| def wifi_class(attrs): |
| return self.FrenzyWifi if 'frenzy' in attrs else self.Wifi |
| |
| self.wifi = sorted([ |
| wifi_class(attrs)(interface_name, |
| metric_for_bands(attrs['bands']), |
| # Prioritize 5 GHz over 2.4. |
| bands=sorted(attrs['bands'], reverse=True)) |
| for interface_name, attrs |
| in get_client_interfaces().iteritems() |
| ], key=lambda w: w.metric) |
| |
| for wifi in self.wifi: |
| wifi.last_wifi_scan_time = -self._wifi_scan_period_s |
| |
| def is_interface_up(self, interface_name): |
| """Explicitly check whether an interface is up. |
| |
| Only used on startup, and only if ifplugd file is missing. |
| |
| Args: |
| interface_name: The name of the interface to check. |
| |
| Returns: |
| Whether the interface is up. |
| """ |
| try: |
| lines = subprocess.check_output(self.IP_LINK).splitlines() |
| except subprocess.CalledProcessError as e: |
| raise EnvironmentError('Failed to call "ip link": %r', e.message) |
| |
| for line in lines: |
| if interface_name in line and 'LOWER_UP' in line: |
| return True |
| |
| return False |
| |
| def run(self): |
| """Run the main loop, and clean up when done.""" |
| try: |
| while True: |
| self.run_once() |
| finally: |
| for wifi in self.wifi: |
| wifi.detach_wpa_control() |
| self.notifier.stop() |
| |
| def run_once(self): |
| """Run one iteration of the main loop. |
| |
| This includes the following: |
| |
| 1. Process any changes in watched files. |
| 2. Check interfaces for changed connectivity, if |
| update_interfaces_and_routes is true. |
| 3. Start, stop, or restart access points as appropriate. If running an |
| access point, skip all remaining wifi steps for that band. |
| 3. Handle any wpa_supplicant events. |
| 4. Periodically, perform a wifi scan. |
| 5. If not connected to the WLAN or to the ACS, try to connect to something. |
| 6. If connected to the ACS but not the WLAN, and enough time has passed |
| since connecting that we should expect a current WLAN configuration, try |
| to join the WLAN again. |
| 7. Sleep for the rest of the duration of _run_duration_s. |
| """ |
| start_time = time.time() |
| self.notifier.process_events() |
| while self.notifier.check_events(): |
| self.notifier.read_events() |
| self.notifier.process_events() |
| |
| self._interface_update_counter += 1 |
| if self._interface_update_counter == self._interface_update_period: |
| self._interface_update_counter = 0 |
| self._update_interfaces_and_routes() |
| |
| for wifi in self.wifi: |
| continue_wifi = False |
| |
| # Only one wlan_configuration per interface will have access_point == |
| # True. Try 5 GHz first, then 2.4 GHz. If both bands are supported by |
| # the same radio, and the enabled band is changed, then hostapd will be |
| # updated by the wifi command, but we should tell any other |
| # wlan_configurations that their APs have been disabled. |
| for band in wifi.bands: |
| wlan_configuration = self._wlan_configuration.get(band, None) |
| if continue_wifi: |
| if wlan_configuration: |
| wlan_configuration.access_point_up = False |
| continue |
| |
| # Make sure access point is running iff it should be. |
| if wlan_configuration: |
| self._update_access_point(wlan_configuration) |
| # If we are running an AP on this interface, we don't want to make any |
| # client connections on it. |
| if wlan_configuration.access_point_up: |
| continue_wifi = True |
| |
| if not wifi.attached(): |
| logging.debug('Attempting to attach to wpa control interface for %s', |
| wifi.name) |
| self._status.attached_to_wpa_supplicant = wifi.attach_wpa_control( |
| self._wpa_control_interface) |
| wifi.handle_wpa_events() |
| |
| if continue_wifi: |
| logging.debug('Running AP on %s, nothing else to do.', wifi.name) |
| continue |
| |
| # If this interface is connected to the user's WLAN, there is nothing else |
| # to do. |
| if self._connected_to_wlan(wifi): |
| self._status.connected_to_wlan = True |
| logging.debug('Connected to WLAN on %s, nothing else to do.', wifi.name) |
| return |
| |
| # This interface is not connected to the WLAN, so scan for potential |
| # routes to the ACS for provisioning. |
| if (not self.acs() and |
| not getattr(wifi, 'last_successful_bss_info', None) and |
| time.time() > wifi.last_wifi_scan_time + self._wifi_scan_period_s): |
| logging.debug('Performing scan on %s.', wifi.name) |
| self._wifi_scan(wifi) |
| |
| # Periodically retry rejoining the WLAN. If the WLAN configuration is |
| # updated then _update_wlan_configuration will do this immediately, but |
| # maybe the credentials didn't change and we were just waiting for the AP |
| # to restart or something. Try both bands, so we can fall back to 2.4 in |
| # case 5 is unavailable for some reason. |
| for band in wifi.bands: |
| wlan_configuration = self._wlan_configuration.get(band, None) |
| if wlan_configuration and time.time() > self._try_wlan_after[band]: |
| logging.debug('Trying to join WLAN on %s.', wifi.name) |
| wlan_configuration.start_client() |
| if self._connected_to_wlan(wifi): |
| logging.debug('Joined WLAN on %s.', wifi.name) |
| self._status.connected_to_wlan = True |
| self._try_wlan_after[band] = 0 |
| break |
| else: |
| logging.error('Failed to connect to WLAN on %s.', wifi.name) |
| self._status.connected_to_wlan = False |
| self._try_wlan_after[band] = time.time() + self._wlan_retry_s |
| else: |
| # If we are aren't on the WLAN, can ping the ACS, and haven't gotten a |
| # new WLAN configuration yet, there are two possibilities: |
| # |
| # 1) The configuration didn't change, and we should retry connecting. |
| # 2) cwmpd isn't writing a configuration, possibly because the device |
| # isn't registered to any accounts. |
| logging.debug('Unable to join WLAN on %s', wifi.name) |
| self._status.connected_to_wlan = False |
| if self.acs(): |
| logging.debug('Connected to ACS on %s', wifi.name) |
| wifi.last_successful_bss_info = getattr(wifi, |
| 'last_attempted_bss_info', |
| None) |
| now = time.time() |
| if (self._wlan_configuration and |
| hasattr(wifi, 'waiting_for_acs_since')): |
| if now - wifi.waiting_for_acs_since > self._acs_update_wait_s: |
| logging.info('ACS has not updated WLAN configuration; will retry ' |
| ' with old config.') |
| for w in self.wifi: |
| for b in w.bands: |
| self._try_wlan_after[b] = now |
| continue |
| # We don't want to want to log this spammily, so do exponential |
| # backoff. |
| elif (hasattr(wifi, 'complain_about_acs_at') |
| and now >= wifi.complain_about_acs_at): |
| wait = wifi.complain_about_acs_at - wifi.waiting_for_acs_since |
| logging.info('Can ping ACS, but no WLAN configuration for %ds.', |
| wait) |
| wifi.complain_about_acs_at += wait |
| # If we didn't manage to join the WLAN and we don't have an ACS |
| # connection, we should try to establish one. |
| else: |
| logging.debug('Not connected to ACS on %s', wifi.name) |
| self._try_next_bssid(wifi) |
| |
| time.sleep(max(0, self._run_duration_s - (time.time() - start_time))) |
| |
| def acs(self): |
| result = self.bridge.acs() or any(wifi.acs() for wifi in self.wifi) |
| self._status.can_reach_acs = result |
| return result |
| |
| def internet(self): |
| result = self.bridge.internet() or any(wifi.internet() |
| for wifi in self.wifi) |
| self._status.can_reach_internet = result |
| return result |
| |
| def _update_interfaces_and_routes(self): |
| """Touch each interface via update_routes.""" |
| |
| self.bridge.update_routes() |
| for wifi in self.wifi: |
| wifi.update_routes() |
| # If wifi is connected to something that's not the WLAN, it must be a |
| # provisioning attempt, and in particular that attempt must be via |
| # last_attempted_bss_info. If that is the same as the |
| # last_successful_bss_info (i.e. the last attempt was successful) and we |
| # aren't connected to the ACS after calling update_routes (which expires |
| # the connection status cache), then this BSS is no longer successful. |
| if (wifi.wpa_supplicant and |
| not self._connected_to_wlan(wifi) and |
| (getattr(wifi, 'last_successful_bss_info', None) == |
| getattr(wifi, 'last_attempted_bss_info', None)) and |
| not wifi.acs()): |
| wifi.last_successful_bss_info = None |
| |
| # Make sure these get called semi-regularly so that exported status is up- |
| # to-date. |
| self.acs() |
| self.internet() |
| |
| def handle_event(self, path, filename, deleted): |
| if deleted: |
| self._handle_deleted_file(path, filename) |
| else: |
| self._process_file(path, filename) |
| |
| def _handle_deleted_file(self, path, filename): |
| if path == self._config_dir: |
| match = re.match(self.COMMAND_FILE_REGEXP, filename) |
| if match: |
| band = match.group('band') |
| if band in self._wlan_configuration: |
| self._remove_wlan_configuration(band) |
| return |
| |
| match = re.match(self.ACCESS_POINT_FILE_REGEXP, filename) |
| if match: |
| band = match.group('band') |
| if band in self._wlan_configuration: |
| self._wlan_configuration[band].access_point = False |
| return |
| |
| def _remove_wlan_configuration(self, band): |
| config = self._wlan_configuration[band] |
| config.stop_client() |
| config.stop_access_point() |
| del self._wlan_configuration[band] |
| if not self._wlan_configuration: |
| self._status.have_config = False |
| |
| def _process_file(self, path, filename): |
| """Process or ignore an updated file in a watched directory.""" |
| filepath = os.path.join(path, filename) |
| try: |
| contents = open(filepath).read().strip() |
| except IOError as e: |
| if e.errno == errno.ENOENT: |
| # Logging about failing to open .tmp files results in spammy logs. |
| if not filename.endswith('.tmp'): |
| logging.error('Not a file: %s', filepath) |
| return |
| else: |
| raise |
| |
| if path == self._interface_status_dir: |
| if filename == self.ETHERNET_STATUS_FILE: |
| try: |
| self.bridge.ethernet = bool(int(contents)) |
| logging.debug('Ethernet %s', 'up' if self.bridge.ethernet else 'down') |
| except ValueError: |
| logging.error('Status file contents should be 0 or 1, not %s', |
| contents) |
| return |
| |
| elif path == self._config_dir: |
| if filename.startswith(self.COMMAND_FILE_PREFIX): |
| match = re.match(self.COMMAND_FILE_REGEXP, filename) |
| if match: |
| band = match.group('band') |
| wifi = self.wifi_for_band(band) |
| if wifi: |
| self._update_wlan_configuration( |
| self.WLANConfiguration(band, wifi, contents, self._status, |
| self._wpa_control_interface)) |
| elif filename.startswith(self.ACCESS_POINT_FILE_PREFIX): |
| match = re.match(self.ACCESS_POINT_FILE_REGEXP, filename) |
| if match: |
| band = match.group('band') |
| wifi = self.wifi_for_band(band) |
| if wifi and band in self._wlan_configuration: |
| self._wlan_configuration[band].access_point = True |
| logging.debug('AP enabled for %s GHz', band) |
| |
| elif path == self._tmp_dir: |
| if filename.startswith(self.GATEWAY_FILE_PREFIX): |
| interface_name = filename.split(self.GATEWAY_FILE_PREFIX)[-1] |
| ifc = self.interface_by_name(interface_name) |
| if ifc: |
| ifc.set_gateway_ip(contents) |
| logging.debug('Received gateway %r for interface %s', contents, |
| ifc.name) |
| |
| elif path == self._moca_tmp_dir: |
| match = re.match(r'^%s\d+$' % self.MOCA_NODE_FILE_PREFIX, filename) |
| if match: |
| try: |
| json_contents = json.loads(contents) |
| except ValueError: |
| logging.error('Cannot parse %s as JSON.', filepath) |
| return |
| node = json_contents['NodeId'] |
| had_moca = self.bridge.moca |
| if json_contents.get('RxNBAS', 0) == 0: |
| self.bridge.remove_moca_station(node) |
| else: |
| self.bridge.add_moca_station(node) |
| has_moca = self.bridge.moca |
| if had_moca != has_moca: |
| self.ifplugd_action('moca0', has_moca) |
| |
| def interface_by_name(self, interface_name): |
| for ifc in [self.bridge] + self.wifi: |
| if ifc.name == interface_name: |
| return ifc |
| |
| def wifi_for_band(self, band): |
| for wifi in self.wifi: |
| if band in wifi.bands: |
| return wifi |
| |
| logging.error('No wifi interface for %s GHz. wlan interfaces:\n%s', |
| band, '\n'.join('%s: %r' % |
| (w.name, w.bands) for w in self.wifi)) |
| |
| def ifplugd_action(self, interface_name, up): |
| subprocess.call(self.IFPLUGD_ACTION + [interface_name, |
| 'up' if up else 'down']) |
| |
| def _wifi_scan(self, wifi): |
| """Perform a wifi scan and update wifi.cycler.""" |
| logging.info('Scanning on %s...', wifi.name) |
| wifi.last_wifi_scan_time = time.time() |
| subprocess.call(self.IFUP + [wifi.name]) |
| # /bin/wifi takes a --band option but then finds the right interface for it, |
| # so it's okay to just pick the first band here. |
| items = self._find_bssids(wifi.bands[0]) |
| logging.info('Done scanning on %s', wifi.name) |
| if not hasattr(wifi, 'cycler'): |
| wifi.cycler = cycler.AgingPriorityCycler( |
| cycle_length_s=self._bssid_cycle_length_s) |
| # Shuffle items to undefined determinism in scan results + dict |
| # implementation unfairly biasing BSSID order. |
| random.shuffle(items) |
| wifi.cycler.update(items) |
| |
| def _find_bssids(self, band): |
| """Wrapper used as a unit testing seam.""" |
| return iw.find_bssids(band, False) |
| |
| def _try_next_bssid(self, wifi): |
| """Attempt to connect to the next BSSID in wifi's BSSID cycler. |
| |
| Args: |
| wifi: The wifi interface to use. |
| |
| Returns: |
| Whether connecting to the network succeeded. |
| """ |
| if not hasattr(wifi, 'cycler'): |
| return False |
| |
| last_successful_bss_info = getattr(wifi, 'last_successful_bss_info', None) |
| bss_info = last_successful_bss_info or wifi.cycler.next() |
| if bss_info is not None: |
| logging.debug('Attempting to connect to SSID %s for provisioning', |
| bss_info.ssid) |
| self._status.trying_open = True |
| connected = self._try_bssid(wifi, bss_info) |
| if connected: |
| self._status.connected_to_open = True |
| now = time.time() |
| wifi.waiting_for_acs_since = now |
| wifi.complain_about_acs_at = now + 5 |
| logging.info('Attempting to provision via SSID %s', bss_info.ssid) |
| # If we can no longer connect to this, it's no longer successful. |
| elif bss_info == last_successful_bss_info: |
| wifi.last_successful_bss_info = None |
| return connected |
| else: |
| # TODO(rofrankel): There are probably more cases in which this should be |
| # true, e.g. if we keep trying the same few unsuccessful BSSIDs. |
| # Relatedly, once we find ACS access on an open network we may want to |
| # save that SSID/BSSID and that first in future. If we do that then we |
| # can declare that provisioning has failed much more aggressively. |
| self._status.provisioning_failed = True |
| |
| return False |
| |
| def _try_bssid(self, wifi, bss_info): |
| wifi.last_attempted_bss_info = bss_info |
| return subprocess.call(self.WIFI_SETCLIENT + |
| ['--ssid', bss_info.ssid, |
| '--band', wifi.bands[0], |
| '--bssid', bss_info.bssid]) == 0 |
| |
| def _connected_to_wlan(self, wifi): |
| return (wifi.wpa_supplicant and |
| any(config.client_up for band, config |
| in self._wlan_configuration.iteritems() |
| if band in wifi.bands)) |
| |
| def _update_wlan_configuration(self, wlan_configuration): |
| band = wlan_configuration.band |
| current = self._wlan_configuration.get(band, None) |
| if current is None or wlan_configuration.command != current.command: |
| if current is not None: |
| wlan_configuration.access_point = current.access_point |
| else: |
| ap_file = os.path.join( |
| self._config_dir, self.ACCESS_POINT_FILE_PREFIX + |
| (('%s.' % wlan_configuration.interface_suffix) |
| if wlan_configuration.interface_suffix else '') + band) |
| wlan_configuration.access_point = os.path.exists(ap_file) |
| self._wlan_configuration[band] = wlan_configuration |
| self._status.have_config = True |
| logging.debug('Updated WLAN configuration for %s GHz', band) |
| self._update_access_point(wlan_configuration) |
| |
| def _update_access_point(self, wlan_configuration): |
| if self.bridge.internet() and wlan_configuration.access_point: |
| wlan_configuration.start_access_point() |
| else: |
| wlan_configuration.stop_access_point() |
| wlan_configuration.start_client() |
| |
| def _stop_wifi(self, band, stopap, stopclient): |
| """Stop running wifi processes. |
| |
| At least one of [stopap, stopclient] must be True. |
| |
| Args: |
| band: The band on which to stop wifi. |
| stopap: Whether to stop access points. |
| stopclient: Whether to stop wifi clients. |
| |
| Raises: |
| ValueError: If neither stopap nor stopclient is True. |
| """ |
| if stopap and stopclient: |
| command = 'stop' |
| elif stopap: |
| command = 'stopap' |
| elif stopclient: |
| command = 'stopclient' |
| else: |
| raise ValueError('Called _stop_wifi without specifying AP or client.') |
| |
| full_command = [command, '--band', band, '--persist'] |
| |
| try: |
| self._binwifi(*full_command) |
| except subprocess.CalledProcessError as e: |
| logging.error('wifi %s failed: "%s"', ' '.join(full_command), e.output) |
| |
| def _binwifi(self, *command): |
| """Test seam for calls to /bin/wifi. |
| |
| Only used by _stop_wifi, and probably shouldn't be used by anything else. |
| |
| Args: |
| *command: A command for /bin/wifi |
| |
| Raises: |
| subprocess.CalledProcessError: If the command fails. Deliberately not |
| handled here to make future authors think twice before using this. |
| """ |
| subprocess.check_output(self.BINWIFI + list(command), |
| stderr=subprocess.STDOUT) |
| |
| |
| def _wifi_show(): |
| try: |
| return subprocess.check_output(['wifi', 'show']) |
| except subprocess.CalledProcessError as e: |
| logging.error('Failed to call "wifi show": %s', e) |
| return '' |
| |
| |
| def _get_quantenna_interfaces(): |
| try: |
| return subprocess.check_output(['get-quantenna-interfaces']).split() |
| except subprocess.CalledProcessError: |
| logging.fatal('Failed to call get-quantenna-interfaces') |
| raise |
| |
| |
| def get_client_interfaces(): |
| """Find all client interfaces on the device. |
| |
| Returns: |
| A dict mapping wireless client interfaces to their supported bands. |
| """ |
| # TODO(mikemu): Use wifi_files instead of "wifi show". |
| |
| current_band = None |
| result = collections.defaultdict(lambda: collections.defaultdict(set)) |
| for line in _wifi_show().splitlines(): |
| if line.startswith('Band:'): |
| current_band = line.split()[1] |
| elif line.startswith('Client Interface:'): |
| result[line.split()[2]]['bands'].add(current_band) |
| |
| for quantenna_interface in _get_quantenna_interfaces(): |
| if quantenna_interface.startswith('wcli'): |
| result[quantenna_interface]['bands'].add('5') |
| result[quantenna_interface]['frenzy'] = True |
| |
| return result |
