import time import chutney def run_test(network): wait_time = network._dfltEnv['bootstrap_time'] start_time = time.time() end_time = start_time + wait_time print("Verifying data transmission: (retrying for up to %d seconds)" % wait_time) status = False # Keep on retrying the verify until it succeeds or times out while not status and time.time() < end_time: # TrafficTester connections time out after ~3 seconds # a TrafficTester times out after ~10 seconds if no data is being sent status = _verify_traffic(network) # Avoid madly spewing output if we fail immediately each time if not status: time.sleep(5) print("Transmission: %s" % ("Success" if status else "Failure")) if not status: # TODO: allow the debug flag to be passed as an argument to # src/test/test-network.sh and chutney print("Set 'debug_flag = True' in Traffic.py to diagnose.") return status def _verify_traffic(network): """Verify (parts of) the network by sending traffic through it and verify what is received.""" # TODO: IPv6 SOCKSPorts, SOCKSPorts with IPv6Traffic, and IPv6 Exits LISTEN_ADDR = network._dfltEnv['ip'] LISTEN_PORT = 4747 # FIXME: Do better! Note the default exit policy. # HSs must have a HiddenServiceDir with # "HiddenServicePort :" # TODO: Test : HS_PORT = 5858 # The amount of data to send between each source-sink pair, # each time the source connects. # We create a source-sink pair for each (bridge) client to an exit, # and a source-sink pair for a (bridge) client to each hidden service DATALEN = network._dfltEnv['data_bytes'] # Print a dot each time a sink verifies this much data DOTDATALEN = 5 * 1024 * 1024 # Octets. TIMEOUT = 3 # Seconds. # Calculate the amount of random data we should use randomlen = _calculate_randomlen(DATALEN) reps = _calculate_reps(DATALEN, randomlen) connection_count = network._dfltEnv['connection_count'] # sanity check if reps == 0: DATALEN = 0 # Get the random data if randomlen > 0: # print a dot after every DOTDATALEN data is verified, rounding up dot_reps = _calculate_reps(DOTDATALEN, randomlen) # make sure we get at least one dot per transmission dot_reps = min(reps, dot_reps) with open('/dev/urandom', 'r') as randfp: tmpdata = randfp.read(randomlen) else: dot_reps = 0 tmpdata = {} # now make the connections bind_to = (LISTEN_ADDR, LISTEN_PORT) tt = chutney.Traffic.TrafficTester(bind_to, tmpdata, TIMEOUT, reps, dot_reps) client_list = filter(lambda n: n._env['tag'] == 'c' or n._env['tag'] == 'bc', network._nodes) exit_list = filter(lambda n: ('exit' in n._env.keys()) and n._env['exit'] == 1, network._nodes) hs_list = filter(lambda n: n._env['tag'] == 'h', network._nodes) if len(client_list) == 0: print(" Unable to verify network: no client nodes available") return False if len(exit_list) == 0 and len(hs_list) == 0: print(" Unable to verify network: no exit/hs nodes available") print(" Exit nodes must be declared 'relay=1, exit=1'") print(" HS nodes must be declared 'tag=\"hs\"'") return False print("Connecting:") # the number of tor nodes in paths which will send DATALEN data # if a node is used in two paths, we count it twice # this is a lower bound, as cannabilised circuits are one node longer total_path_node_count = 0 total_path_node_count += _configure_exits(tt, bind_to, tmpdata, reps, client_list, exit_list, LISTEN_ADDR, LISTEN_PORT, connection_count) total_path_node_count += _configure_hs(tt, tmpdata, reps, client_list, hs_list, HS_PORT, LISTEN_ADDR, LISTEN_PORT, connection_count, network._dfltEnv['hs_multi_client']) print("Transmitting Data:") start_time = time.time() status = tt.run() end_time = time.time() # if we fail, don't report the bandwidth if not status: return status # otherwise, report bandwidth used, if sufficient data was transmitted _report_bandwidth(DATALEN, total_path_node_count, start_time, end_time) return status # In order to performance test a tor network, we need to transmit # several hundred megabytes of data or more. Passing around this # much data in Python has its own performance impacts, so we provide # a smaller amount of random data instead, and repeat it to DATALEN def _calculate_randomlen(datalen): MAX_RANDOMLEN = 128 * 1024 # Octets. if datalen > MAX_RANDOMLEN: return MAX_RANDOMLEN else: return datalen def _calculate_reps(datalen, replen): # sanity checks if datalen == 0 or replen == 0: return 0 # effectively rounds datalen up to the nearest replen if replen < datalen: return (datalen + replen - 1) / replen else: return 1 # if there are any exits, each client / bridge client transmits # via 4 nodes (including the client) to an arbitrary exit # Each client binds directly to :LISTEN_PORT # via an Exit relay def _configure_exits(tt, bind_to, tmpdata, reps, client_list, exit_list, LISTEN_ADDR, LISTEN_PORT, connection_count): CLIENT_EXIT_PATH_NODES = 4 exit_path_node_count = 0 if len(exit_list) > 0: exit_path_node_count += (len(client_list) * CLIENT_EXIT_PATH_NODES * connection_count) for op in client_list: print(" Exit to %s:%d via client %s:%s" % (LISTEN_ADDR, LISTEN_PORT, 'localhost', op._env['socksport'])) for _ in range(connection_count): proxy = ('localhost', int(op._env['socksport'])) tt.add(chutney.Traffic.Source(tt, bind_to, tmpdata, proxy, reps)) return exit_path_node_count # The HS redirects .onion connections made to hs_hostname:HS_PORT # to the Traffic Tester's CHUTNEY_LISTEN_ADDRESS:LISTEN_PORT # an arbitrary client / bridge client transmits via 8 nodes # (including the client and hs) to each hidden service # Instead of binding directly to LISTEN_PORT via an Exit relay, # we bind to hs_hostname:HS_PORT via a hidden service connection def _configure_hs(tt, tmpdata, reps, client_list, hs_list, HS_PORT, LISTEN_ADDR, LISTEN_PORT, connection_count, hs_multi_client): CLIENT_HS_PATH_NODES = 8 hs_path_node_count = (len(hs_list) * CLIENT_HS_PATH_NODES * connection_count) # Each client in hs_client_list connects to each hs if hs_multi_client: hs_client_list = client_list hs_path_node_count *= len(client_list) else: # only use the first client in the list hs_client_list = client_list[:1] # Setup the connections from each client in hs_client_list to each hs for hs in hs_list: hs_bind_to = (hs._env['hs_hostname'], HS_PORT) for client in hs_client_list: print(" HS to %s:%d (%s:%d) via client %s:%s" % (hs._env['hs_hostname'], HS_PORT, LISTEN_ADDR, LISTEN_PORT, 'localhost', client._env['socksport'])) for _ in range(connection_count): proxy = ('localhost', int(client._env['socksport'])) tt.add(chutney.Traffic.Source(tt, hs_bind_to, tmpdata, proxy, reps)) return hs_path_node_count # calculate the single stream bandwidth and overall tor bandwidth # the single stream bandwidth is the bandwidth of the # slowest stream of all the simultaneously transmitted streams # the overall bandwidth estimates the simultaneous bandwidth between # all tor nodes over all simultaneous streams, assuming: # * minimum path lengths (no cannibalized circuits) # * unlimited network bandwidth (that is, localhost) # * tor performance is CPU-limited # This be used to estimate the bandwidth capacity of a CPU-bound # tor relay running on this machine def _report_bandwidth(data_length, total_path_node_count, start_time, end_time): # otherwise, if we sent at least 5 MB cumulative total, and # it took us at least a second to send, report bandwidth MIN_BWDATA = 5 * 1024 * 1024 # Octets. MIN_ELAPSED_TIME = 1.0 # Seconds. cumulative_data_sent = total_path_node_count * data_length elapsed_time = end_time - start_time if (cumulative_data_sent >= MIN_BWDATA and elapsed_time >= MIN_ELAPSED_TIME): # Report megabytes per second BWDIVISOR = 1024*1024 single_stream_bandwidth = (data_length / elapsed_time / BWDIVISOR) overall_bandwidth = (cumulative_data_sent / elapsed_time / BWDIVISOR) print("Single Stream Bandwidth: %.2f MBytes/s" % single_stream_bandwidth) print("Overall tor Bandwidth: %.2f MBytes/s" % overall_bandwidth)