# Copyright (c) 2013 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. import logging import os import sys import tempfile from autotest_lib.client.bin import test, utils from autotest_lib.client.common_lib import error, utils from autotest_lib.client.common_lib.cros import avahi_utils from autotest_lib.client.cros import service_stopper from autotest_lib.client.cros.netprotos import cros_p2p, zeroconf P2P_CLIENT = '/usr/sbin/p2p-client' class p2p_ConsumeFiles(test.test): """The P2P Client class tester. Creates a fake network of peers with lansim and tests if p2p-client can discover files on that network. """ version = 1 def setup(self): self.job.setup_dep(['lansim']) def initialize(self): dep = 'lansim' dep_dir = os.path.join(self.autodir, 'deps', dep) logging.info('lansim is at %s', dep_dir) self.job.install_pkg(dep, 'dep', dep_dir) # Import the lansim modules installed on lansim/build/ sys.path.append(os.path.join(dep_dir, 'build')) self._services = None self._tap = None def cleanup(self): avahi_utils.avahi_stop() if self._tap: self._tap.down() if self._services: self._services.restore_services() def _setup_avahi(self): """Initializes avahi daemon on a new tap interface.""" from lansim import tuntap # Ensure p2p and avahi aren't running. self._services = service_stopper.ServiceStopper(['p2p', 'avahi']) self._services.stop_services() # Initialize avahi-daemon listenning only on the fake TAP interface. self._tap = tuntap.TunTap(tuntap.IFF_TAP, name='faketap') # The network 169.254/16 shouldn't clash with other real services. We # use a /24 subnet of it here. self._tap.set_addr('169.254.10.1', mask=24) self._tap.up() # Re-launch avahi-daemon on the tap interface. avahi_utils.avahi_start_on_iface(self._tap.name) def _run_p2p_client(self, args, timeout=10., ignore_status=False): """Run p2p-client with the provided arguments. @param args: list of strings, each one representing an argument. @param timeout: Timeout for p2p-client in seconds before it's killed. @return: the return value of the process and the stdout content. """ fd, tempfn = tempfile.mkstemp(prefix='p2p-output') ret = utils.run( P2P_CLIENT, args=['-v=1'] + list(args), timeout=timeout, ignore_timeout=True, ignore_status=True, stdout_tee=open(tempfn, 'w'), stderr_tee=sys.stdout) url = os.fdopen(fd).read() os.unlink(tempfn) if not ignore_status and ret is None: self._join_simulator() raise error.TestFail('p2p-client %s timeout.' % ' '.join(args)) if not ignore_status and ret.exit_status != 0: self._join_simulator() raise error.TestFail('p2p-client %s finished with value: %d' % ( ' '.join(args), ret.exit_status)) return None if ret is None else ret.exit_status, url def _join_simulator(self): """Stops the simulator and logs any exception generated there.""" self._sim.stop() self._sim.join() if self._sim.error: logging.error('SimulatorThread exception: %r', self._sim.error) logging.error(self._sim.traceback) def run_once(self): from lansim import simulator, host # Setup the environment where avahi-daemon runs during the test. self._setup_avahi() self._sim = simulator.SimulatorThread(self._tap) # Create three peers host-a, host-b and host-c sharing a set of files. # This first block creates the fake host on the simulator. For clarity # and easier debug, note that the last octect on the IPv4 address is the # ASCII for a, b and c respectively. peer_a = host.SimpleHost(self._sim, '94:EB:2C:00:00:61', '169.254.10.97') peer_b = host.SimpleHost(self._sim, '94:EB:2C:00:00:62', '169.254.10.98') peer_c = host.SimpleHost(self._sim, '94:EB:2C:00:00:63', '169.254.10.99') # Run a userspace implementation of avahi + p2p-server on the fake # hosts. This announces the P2P service on each fake host. zero_a = zeroconf.ZeroconfDaemon(peer_a, 'host-a') zero_b = zeroconf.ZeroconfDaemon(peer_b, 'host-b') zero_c = zeroconf.ZeroconfDaemon(peer_c, 'host-c') cros_a = cros_p2p.CrosP2PDaemon(zero_a) cros_b = cros_p2p.CrosP2PDaemon(zero_b) cros_c = cros_p2p.CrosP2PDaemon(zero_c) # Add files to each host. All the three hosts share the file "everyone" # with different size, used to test the minimum-size argument. # host-a and host-b share another file only-a and only-b respectively, # used to check that the p2p-client picks the right peer. cros_a.add_file('everyone', 1000) cros_b.add_file('everyone', 10000) cros_c.add_file('everyone', 20000) cros_a.add_file('only-a', 5000) cros_b.add_file('only-b', 8000) # Initially set the number of connections on the network to a low number # (two) that later will be increased to test if p2p-client hangs when # there are too many connections. cros_a.set_num_connections(1) cros_c.set_num_connections(1) self._sim.start() ### Request a file shared from only one peer. _ret, url = self._run_p2p_client( args=('--get-url=only-a',), timeout=10.) if url.strip() != 'http://169.254.10.97:16725/only-a': self._join_simulator() raise error.TestFail('Received unknown url: "%s"' % url) ### Check that the num_connections is reported properly. _ret, conns = self._run_p2p_client(args=('--num-connections',), timeout=10.) if conns.strip() != '2': self._join_simulator() raise error.TestFail('Wrong number of connections reported: %s' % conns) ### Request a file shared from a peer with enough of the file. _ret, url = self._run_p2p_client( args=('--get-url=everyone', '--minimum-size=15000'), timeout=10.) if url.strip() != 'http://169.254.10.99:16725/everyone': self._join_simulator() raise error.TestFail('Received unknown url: "%s"' % url) ### Request too much bytes of an existing file. ret, url = self._run_p2p_client( args=('--get-url=only-b', '--minimum-size=10000'), timeout=10., ignore_status=True) if url: self._join_simulator() raise error.TestFail('Received url but expected none: "%s"' % url) if ret == 0: raise error.TestFail('p2p-client returned no URL, but without an ' 'error.') ### Check that p2p-client hangs while waiting for a peer when there are ### too many connections. self._sim.run_on_simulator( lambda: cros_a.set_num_connections(99, announce=True)) # For a query on the DUT to check that the new information is received. for attempt in range(5): _ret, conns = self._run_p2p_client(args=('--num-connections',), timeout=10.) conns = conns.strip() if conns == '100': break if conns != '100': self._join_simulator() raise error.TestFail("p2p-client --num-connections doesn't reflect " "the current number of connections on the " "network, returned %s" % conns) ret, url = self._run_p2p_client( args=('--get-url=only-b',), timeout=5., ignore_status=True) if not ret is None: self._join_simulator() raise error.TestFail('p2p-client finished but should have waited ' 'for num_connections to drop.') self._sim.stop() self._sim.join() if self._sim.error: raise error.TestError('SimulatorThread ended with an exception: %r' % self._sim.error)