150 lines
4.9 KiB
Python
150 lines
4.9 KiB
Python
import sys
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import os
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import socket
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import threading
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import atexit
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import preserves.schema
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import time
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import re
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from syndicate import patterns as P, relay, turn, dataspace, Symbol
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from syndicate.actor import find_loop
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from syndicate.during import During
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try:
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schemas = preserves.schema.load_schema_file('/usr/share/synit/schemas/schema-bundle.prb')
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except:
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schemas = preserves.schema.load_schema_file('/home/tonyg/src/syndicate-system/protocols/schema-bundle.bin')
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network = schemas.network
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server_socket_dir = '/run/wpa_supplicant'
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class WPASupplicantClient:
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# https://w1.fi/wpa_supplicant/devel/ctrl_iface_page.html
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#
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# According to the code (!) any response starting with '<' is an event, not a reply.
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def __init__(self, interface, log):
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self.interface = interface
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self.log = log
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self.server_socket_path = os.path.join(server_socket_dir, interface)
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self.client_socket_path = f'/tmp/wpa_cli_py_{interface}_{os.getpid()}'
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_DGRAM)
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self.sock.bind(self.client_socket_path)
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self.sock.connect(self.server_socket_path)
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self.send('ATTACH')
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answer = self.recv(timeout_sec=3.0)
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if answer != 'OK':
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raise AssertionError(f'wpa_supplicant replied {repr(answer)} to ATTACH')
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self.cleanup = lambda: self.close()
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atexit.register(self.cleanup)
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def close(self):
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if self.cleanup:
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atexit.unregister(self.cleanup)
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self.cleanup = None
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self.send('DETACH')
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self.sock.close()
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os.unlink(self.client_socket_path)
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def send(self, command):
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self.sock.send(command.encode('utf-8'))
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def recv(self, timeout_sec=None):
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self.sock.settimeout(timeout_sec)
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try:
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reply = self.sock.recv(65536)
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self.log.debug(f'Raw input: {repr(reply)}')
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return reply.strip().decode('utf-8')
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except TimeoutError:
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return None
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finally:
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self.sock.settimeout(None)
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def gather_events(facet, callback, client, loop):
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facet.log.debug('Background socket read thread started')
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try:
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while True:
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facet.log.debug('waiting for event...')
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e = client.recv()
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# OMG python's incredibly broken mutable-variable-closures bit me AGAIN. I've had
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# to add a layer of gratuitous rebinding of `e` plus the `lambda:` below to make it
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# properly close over the current binding of `e`.
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def handler_for_specific_e(e):
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return lambda: callback(e)
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turn.external(facet, handler_for_specific_e(e), loop=loop)
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except Exception as e:
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facet.log.debug(e)
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finally:
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facet.log.debug('Background socket read thread terminated')
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@relay.service(name='wifi_daemon', debug=False)
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@During().add_handler
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def main(args):
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machine_ds = args[Symbol('machine')].embeddedValue
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ifname = args[Symbol('ifname')]
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client = WPASupplicantClient(ifname, turn.log)
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commands = []
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def send_next_command():
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while len(commands) > 0:
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turn.log.info(f'Sending {commands[0][0]}')
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client.send(commands[0][0])
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if commands[0][1] is None:
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commands.pop(0)
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continue
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else:
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break
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def send_command(c, handler = lambda reply: None):
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turn.log.info(f'Scheduling {c}')
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commands.append((c, handler))
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if len(commands) == 1:
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send_next_command()
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def cleanout_networks(nets):
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for line in nets.split('\n'):
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if line.startswith('network id'):
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continue
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turn.log.info(f'Cleaning out old network: {repr(line)}')
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send_command('REMOVE_NETWORK ' + line.split('\t')[0])
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send_command('SCAN', handle_scan_failure)
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def handle_scan_failure(reply):
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if reply == 'FAIL':
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send_command('TERMINATE')
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send_command('LEVEL 3')
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send_command('LIST_NETWORKS', cleanout_networks)
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def handle_event(e):
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if e[0] == '<':
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# It's an event
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m = re.match(r'<(\d+)>(.*)', e)
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if m:
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(_level, message) = m.groups()
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if message == 'CTRL-EVENT-SCAN-RESULTS':
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send_command('SCAN_RESULTS')
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turn.log.info(f'Level {_level}: {message}')
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else:
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turn.log.info(f'Unusual event: {e}')
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else:
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if len(commands) > 0:
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turn.log.info(f'REPLY: {e}')
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commands[0][1](e)
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commands.pop(0)
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send_next_command()
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else:
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turn.log.warning(f'Unexpected reply: {e}')
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facet = turn.active_facet()
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loop = find_loop()
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turn.log.info('Starting background read thread')
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threading.Thread(
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name='background-wpa_supplicant-read-thread',
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target=lambda: gather_events(facet, handle_event, client, loop)).start()
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