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"""Unit tests for socket timeout feature.""" import functools import unittest from test import support from test.support import socket_helper import time import errno import socket @functools.lru_cache() def resolve_address(host, port): """Resolve an (host, port) to an address. We must perform name resolution before timeout tests, otherwise it will be performed by connect(). """ with socket_helper.transient_internet(host): return socket.getaddrinfo(host, port, socket.AF_INET, socket.SOCK_STREAM)[0][4] class CreationTestCase(unittest.TestCase): """Test case for socket.gettimeout() and socket.settimeout()""" def setUp(self): self.sock = self.enterContext( socket.socket(socket.AF_INET, socket.SOCK_STREAM)) def testObjectCreation(self): # Test Socket creation self.assertEqual(self.sock.gettimeout(), None, "timeout not disabled by default") def testFloatReturnValue(self): # Test return value of gettimeout() self.sock.settimeout(7.345) self.assertEqual(self.sock.gettimeout(), 7.345) self.sock.settimeout(3) self.assertEqual(self.sock.gettimeout(), 3) self.sock.settimeout(None) self.assertEqual(self.sock.gettimeout(), None) def testReturnType(self): # Test return type of gettimeout() self.sock.settimeout(1) self.assertIs(type(self.sock.gettimeout()), float) self.sock.settimeout(3.9) self.assertIs(type(self.sock.gettimeout()), float) def testTypeCheck(self): # Test type checking by settimeout() self.sock.settimeout(0) self.sock.settimeout(0) self.sock.settimeout(0.0) self.sock.settimeout(None) self.assertRaises(TypeError, self.sock.settimeout, "") self.assertRaises(TypeError, self.sock.settimeout, "") self.assertRaises(TypeError, self.sock.settimeout, ()) self.assertRaises(TypeError, self.sock.settimeout, []) self.assertRaises(TypeError, self.sock.settimeout, {}) self.assertRaises(TypeError, self.sock.settimeout, 0j) def testRangeCheck(self): # Test range checking by settimeout() self.assertRaises(ValueError, self.sock.settimeout, -1) self.assertRaises(ValueError, self.sock.settimeout, -1) self.assertRaises(ValueError, self.sock.settimeout, -1.0) def testTimeoutThenBlocking(self): # Test settimeout() followed by setblocking() self.sock.settimeout(10) self.sock.setblocking(True) self.assertEqual(self.sock.gettimeout(), None) self.sock.setblocking(False) self.assertEqual(self.sock.gettimeout(), 0.0) self.sock.settimeout(10) self.sock.setblocking(False) self.assertEqual(self.sock.gettimeout(), 0.0) self.sock.setblocking(True) self.assertEqual(self.sock.gettimeout(), None) def testBlockingThenTimeout(self): # Test setblocking() followed by settimeout() self.sock.setblocking(False) self.sock.settimeout(1) self.assertEqual(self.sock.gettimeout(), 1) self.sock.setblocking(True) self.sock.settimeout(1) self.assertEqual(self.sock.gettimeout(), 1) class TimeoutTestCase(unittest.TestCase): # There are a number of tests here trying to make sure that an operation # doesn't take too much longer than expected. But competing machine # activity makes it inevitable that such tests will fail at times. # When fuzz was at 1.0, I (tim) routinely saw bogus failures on Win2K # and Win98SE. Boosting it to 2.0 helped a lot, but isn't a real # solution. fuzz = 2.0 localhost = socket_helper.HOST def setUp(self): raise NotImplementedError() def _sock_operation(self, count, timeout, method, *args): """ Test the specified socket method. The method is run at most `count` times and must raise a TimeoutError within `timeout` + self.fuzz seconds. """ self.sock.settimeout(timeout) method = getattr(self.sock, method) for i in range(count): t1 = time.monotonic() try: method(*args) except TimeoutError as e: delta = time.monotonic() - t1 break else: self.fail('TimeoutError was not raised') # These checks should account for timing unprecision self.assertLess(delta, timeout + self.fuzz) self.assertGreater(delta, timeout - 1.0) class TCPTimeoutTestCase(TimeoutTestCase): """TCP test case for socket.socket() timeout functions""" def setUp(self): self.sock = self.enterContext( socket.socket(socket.AF_INET, socket.SOCK_STREAM)) self.addr_remote = resolve_address('www.python.org.', 80) def testConnectTimeout(self): # Testing connect timeout is tricky: we need to have IP connectivity # to a host that silently drops our packets. We can't simulate this # from Python because it's a function of the underlying TCP/IP stack. # So, the following port on the pythontest.net host has been defined: blackhole = resolve_address('pythontest.net', 56666) # Blackhole has been configured to silently drop any incoming packets. # No RSTs (for TCP) or ICMP UNREACH (for UDP/ICMP) will be sent back # to hosts that attempt to connect to this address: which is exactly # what we need to confidently test connect timeout. # However, we want to prevent false positives. It's not unreasonable # to expect certain hosts may not be able to reach the blackhole, due # to firewalling or general network configuration. In order to improve # our confidence in testing the blackhole, a corresponding 'whitehole' # has also been set up using one port higher: whitehole = resolve_address('pythontest.net', 56667) # This address has been configured to immediately drop any incoming # packets as well, but it does it respectfully with regards to the # incoming protocol. RSTs are sent for TCP packets, and ICMP UNREACH # is sent for UDP/ICMP packets. This means our attempts to connect to # it should be met immediately with ECONNREFUSED. The test case has # been structured around this premise: if we get an ECONNREFUSED from # the whitehole, we proceed with testing connect timeout against the # blackhole. If we don't, we skip the test (with a message about not # getting the required RST from the whitehole within the required # timeframe). # For the records, the whitehole/blackhole configuration has been set # up using the 'iptables' firewall, using the following rules: # # -A INPUT -p tcp --destination-port 56666 -j DROP # -A INPUT -p udp --destination-port 56666 -j DROP # -A INPUT -p tcp --destination-port 56667 -j REJECT # -A INPUT -p udp --destination-port 56667 -j REJECT # # See https://github.com/python/psf-salt/blob/main/pillar/base/firewall/snakebite.sls # for the current configuration. skip = True with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock: try: timeout = support.LOOPBACK_TIMEOUT sock.settimeout(timeout) sock.connect((whitehole)) except TimeoutError: pass except OSError as err: if err.errno == errno.ECONNREFUSED: skip = False if skip: self.skipTest( "We didn't receive a connection reset (RST) packet from " "{}:{} within {} seconds, so we're unable to test connect " "timeout against the corresponding {}:{} (which is " "configured to silently drop packets)." .format( whitehole[0], whitehole[1], timeout, blackhole[0], blackhole[1], ) ) # All that hard work just to test if connect times out in 0.001s ;-) self.addr_remote = blackhole with socket_helper.transient_internet(self.addr_remote[0]): self._sock_operation(1, 0.001, 'connect', self.addr_remote) def testRecvTimeout(self): # Test recv() timeout with socket_helper.transient_internet(self.addr_remote[0]): self.sock.connect(self.addr_remote) self._sock_operation(1, 1.5, 'recv', 1024) def testAcceptTimeout(self): # Test accept() timeout socket_helper.bind_port(self.sock, self.localhost) self.sock.listen() self._sock_operation(1, 1.5, 'accept') def testSend(self): # Test send() timeout with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv: socket_helper.bind_port(serv, self.localhost) serv.listen() self.sock.connect(serv.getsockname()) # Send a lot of data in order to bypass buffering in the TCP stack. self._sock_operation(100, 1.5, 'send', b"X" * 200000) def testSendto(self): # Test sendto() timeout with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv: socket_helper.bind_port(serv, self.localhost) serv.listen() self.sock.connect(serv.getsockname()) # The address argument is ignored since we already connected. self._sock_operation(100, 1.5, 'sendto', b"X" * 200000, serv.getsockname()) def testSendall(self): # Test sendall() timeout with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv: socket_helper.bind_port(serv, self.localhost) serv.listen() self.sock.connect(serv.getsockname()) # Send a lot of data in order to bypass buffering in the TCP stack. self._sock_operation(100, 1.5, 'sendall', b"X" * 200000) class UDPTimeoutTestCase(TimeoutTestCase): """UDP test case for socket.socket() timeout functions""" def setUp(self): self.sock = self.enterContext( socket.socket(socket.AF_INET, socket.SOCK_DGRAM)) def testRecvfromTimeout(self): # Test recvfrom() timeout # Prevent "Address already in use" socket exceptions socket_helper.bind_port(self.sock, self.localhost) self._sock_operation(1, 1.5, 'recvfrom', 1024) def setUpModule(): support.requires('network') support.requires_working_socket(module=True) if __name__ == "__main__": unittest.main()