Mercurial > cpython-lru_cache-weakref

annotate Lib/test/test_timeout.py @ 86127:a3d09c19bb93

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merge with 3.3
author Georg Brandl <georg@python.org>
date Sun, 06 Oct 2013 19:24:00 +0200
parents 89df1984adda
children
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1 """Unit tests for socket timeout feature."""
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2
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3 import functools
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4 import unittest
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5 from test import support
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6
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7 # This requires the 'network' resource as given on the regrtest command line.
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8 skip_expected = not support.is_resource_enabled('network')
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9
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10 import time
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11 import errno
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12 import socket
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14
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15 @functools.lru_cache()
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16 def resolve_address(host, port):
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17 """Resolve an (host, port) to an address.
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18
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19 We must perform name resolution before timeout tests, otherwise it will be
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20 performed by connect().
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21 """
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22 with support.transient_internet(host):
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23 return socket.getaddrinfo(host, port, socket.AF_INET,
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24 socket.SOCK_STREAM)[0][4]
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25
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26
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27 class CreationTestCase(unittest.TestCase):
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28 """Test case for socket.gettimeout() and socket.settimeout()"""
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29
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30 def setUp(self):
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31 self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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32
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33 def tearDown(self):
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34 self.sock.close()
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35
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36 def testObjectCreation(self):
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37 # Test Socket creation
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38 self.assertEqual(self.sock.gettimeout(), None,
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39 "timeout not disabled by default")
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40
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41 def testFloatReturnValue(self):
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42 # Test return value of gettimeout()
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43 self.sock.settimeout(7.345)
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44 self.assertEqual(self.sock.gettimeout(), 7.345)
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45
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46 self.sock.settimeout(3)
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47 self.assertEqual(self.sock.gettimeout(), 3)
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48
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49 self.sock.settimeout(None)
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50 self.assertEqual(self.sock.gettimeout(), None)
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51
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52 def testReturnType(self):
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53 # Test return type of gettimeout()
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54 self.sock.settimeout(1)
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55 self.assertEqual(type(self.sock.gettimeout()), type(1.0))
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56
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57 self.sock.settimeout(3.9)
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58 self.assertEqual(type(self.sock.gettimeout()), type(1.0))
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59
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60 def testTypeCheck(self):
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61 # Test type checking by settimeout()
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62 self.sock.settimeout(0)
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63 self.sock.settimeout(0)
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64 self.sock.settimeout(0.0)
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65 self.sock.settimeout(None)
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66 self.assertRaises(TypeError, self.sock.settimeout, "")
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67 self.assertRaises(TypeError, self.sock.settimeout, "")
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68 self.assertRaises(TypeError, self.sock.settimeout, ())
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69 self.assertRaises(TypeError, self.sock.settimeout, [])
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70 self.assertRaises(TypeError, self.sock.settimeout, {})
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71 self.assertRaises(TypeError, self.sock.settimeout, 0j)
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72
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73 def testRangeCheck(self):
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74 # Test range checking by settimeout()
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75 self.assertRaises(ValueError, self.sock.settimeout, -1)
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76 self.assertRaises(ValueError, self.sock.settimeout, -1)
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77 self.assertRaises(ValueError, self.sock.settimeout, -1.0)
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78
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79 def testTimeoutThenBlocking(self):
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80 # Test settimeout() followed by setblocking()
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81 self.sock.settimeout(10)
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82 self.sock.setblocking(1)
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83 self.assertEqual(self.sock.gettimeout(), None)
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84 self.sock.setblocking(0)
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85 self.assertEqual(self.sock.gettimeout(), 0.0)
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86
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87 self.sock.settimeout(10)
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88 self.sock.setblocking(0)
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89 self.assertEqual(self.sock.gettimeout(), 0.0)
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90 self.sock.setblocking(1)
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91 self.assertEqual(self.sock.gettimeout(), None)
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92
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93 def testBlockingThenTimeout(self):
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94 # Test setblocking() followed by settimeout()
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95 self.sock.setblocking(0)
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96 self.sock.settimeout(1)
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97 self.assertEqual(self.sock.gettimeout(), 1)
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98
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99 self.sock.setblocking(1)
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100 self.sock.settimeout(1)
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101 self.assertEqual(self.sock.gettimeout(), 1)
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102
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103
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104 class TimeoutTestCase(unittest.TestCase):
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105 # There are a number of tests here trying to make sure that an operation
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106 # doesn't take too much longer than expected. But competing machine
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107 # activity makes it inevitable that such tests will fail at times.
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108 # When fuzz was at 1.0, I (tim) routinely saw bogus failures on Win2K
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109 # and Win98SE. Boosting it to 2.0 helped a lot, but isn't a real
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110 # solution.
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111 fuzz = 2.0
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112
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113 localhost = support.HOST
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114
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115 def setUp(self):
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116 raise NotImplementedError()
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117
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118 tearDown = setUp
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119
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120 def _sock_operation(self, count, timeout, method, *args):
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121 """
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122 Test the specified socket method.
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123
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124 The method is run at most `count` times and must raise a socket.timeout
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125 within `timeout` + self.fuzz seconds.
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126 """
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127 self.sock.settimeout(timeout)
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128 method = getattr(self.sock, method)
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129 for i in range(count):
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130 t1 = time.time()
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131 try:
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132 method(*args)
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133 except socket.timeout as e:
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134 delta = time.time() - t1
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135 break
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136 else:
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137 self.fail('socket.timeout was not raised')
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138 # These checks should account for timing unprecision
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139 self.assertLess(delta, timeout + self.fuzz)
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140 self.assertGreater(delta, timeout - 1.0)
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141
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142
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143 class TCPTimeoutTestCase(TimeoutTestCase):
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144 """TCP test case for socket.socket() timeout functions"""
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145
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146 def setUp(self):
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147 self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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148 self.addr_remote = resolve_address('www.python.org.', 80)
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149
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150 def tearDown(self):
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151 self.sock.close()
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152
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153 def testConnectTimeout(self):
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154 # Testing connect timeout is tricky: we need to have IP connectivity
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155 # to a host that silently drops our packets. We can't simulate this
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156 # from Python because it's a function of the underlying TCP/IP stack.
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157 # So, the following Snakebite host has been defined:
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158 blackhole = resolve_address('blackhole.snakebite.net', 56666)
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159
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160 # Blackhole has been configured to silently drop any incoming packets.
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161 # No RSTs (for TCP) or ICMP UNREACH (for UDP/ICMP) will be sent back
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162 # to hosts that attempt to connect to this address: which is exactly
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163 # what we need to confidently test connect timeout.
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164
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165 # However, we want to prevent false positives. It's not unreasonable
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166 # to expect certain hosts may not be able to reach the blackhole, due
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167 # to firewalling or general network configuration. In order to improve
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168 # our confidence in testing the blackhole, a corresponding 'whitehole'
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169 # has also been set up using one port higher:
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170 whitehole = resolve_address('whitehole.snakebite.net', 56667)
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171
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172 # This address has been configured to immediately drop any incoming
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173 # packets as well, but it does it respectfully with regards to the
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174 # incoming protocol. RSTs are sent for TCP packets, and ICMP UNREACH
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175 # is sent for UDP/ICMP packets. This means our attempts to connect to
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176 # it should be met immediately with ECONNREFUSED. The test case has
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177 # been structured around this premise: if we get an ECONNREFUSED from
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178 # the whitehole, we proceed with testing connect timeout against the
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179 # blackhole. If we don't, we skip the test (with a message about not
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180 # getting the required RST from the whitehole within the required
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181 # timeframe).
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182
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183 # For the records, the whitehole/blackhole configuration has been set
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184 # up using the 'pf' firewall (available on BSDs), using the following:
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185 #
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186 # ext_if="bge0"
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187 #
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188 # blackhole_ip="35.8.247.6"
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189 # whitehole_ip="35.8.247.6"
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190 # blackhole_port="56666"
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191 # whitehole_port="56667"
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192 #
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193 # block return in log quick on $ext_if proto { tcp udp } \
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194 # from any to $whitehole_ip port $whitehole_port
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195 # block drop in log quick on $ext_if proto { tcp udp } \
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196 # from any to $blackhole_ip port $blackhole_port
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197 #
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198
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199 skip = True
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200 sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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201 # Use a timeout of 3 seconds. Why 3? Because it's more than 1, and
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202 # less than 5. i.e. no particular reason. Feel free to tweak it if
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203 # you feel a different value would be more appropriate.
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204 timeout = 3
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205 sock.settimeout(timeout)
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206 try:
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207 sock.connect((whitehole))
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208 except socket.timeout:
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209 pass
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210 except OSError as err:
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211 if err.errno == errno.ECONNREFUSED:
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212 skip = False
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213 finally:
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214 sock.close()
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215 del sock
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216
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217 if skip:
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218 self.skipTest(
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219 "We didn't receive a connection reset (RST) packet from "
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220 "{}:{} within {} seconds, so we're unable to test connect "
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221 "timeout against the corresponding {}:{} (which is "
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222 "configured to silently drop packets)."
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223 .format(
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224 whitehole[0],
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225 whitehole[1],
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226 timeout,
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227 blackhole[0],
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228 blackhole[1],
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229 )
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230 )
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231
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232 # All that hard work just to test if connect times out in 0.001s ;-)
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233 self.addr_remote = blackhole
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234 with support.transient_internet(self.addr_remote[0]):
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235 self._sock_operation(1, 0.001, 'connect', self.addr_remote)
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236
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237 def testRecvTimeout(self):
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238 # Test recv() timeout
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239 with support.transient_internet(self.addr_remote[0]):
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240 self.sock.connect(self.addr_remote)
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241 self._sock_operation(1, 1.5, 'recv', 1024)
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242
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243 def testAcceptTimeout(self):
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244 # Test accept() timeout
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245 support.bind_port(self.sock, self.localhost)
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246 self.sock.listen(5)
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247 self._sock_operation(1, 1.5, 'accept')
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248
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249 def testSend(self):
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250 # Test send() timeout
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251 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv:
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252 support.bind_port(serv, self.localhost)
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253 serv.listen(5)
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254 self.sock.connect(serv.getsockname())
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255 # Send a lot of data in order to bypass buffering in the TCP stack.
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256 self._sock_operation(100, 1.5, 'send', b"X" * 200000)
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257
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258 def testSendto(self):
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259 # Test sendto() timeout
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260 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv:
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261 support.bind_port(serv, self.localhost)
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262 serv.listen(5)
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263 self.sock.connect(serv.getsockname())
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264 # The address argument is ignored since we already connected.
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265 self._sock_operation(100, 1.5, 'sendto', b"X" * 200000,
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266 serv.getsockname())
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267
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268 def testSendall(self):
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269 # Test sendall() timeout
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270 with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as serv:
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271 support.bind_port(serv, self.localhost)
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272 serv.listen(5)
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273 self.sock.connect(serv.getsockname())
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274 # Send a lot of data in order to bypass buffering in the TCP stack.
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275 self._sock_operation(100, 1.5, 'sendall', b"X" * 200000)
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276
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277
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278 class UDPTimeoutTestCase(TimeoutTestCase):
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279 """UDP test case for socket.socket() timeout functions"""
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280
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281 def setUp(self):
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282 self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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283
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284 def tearDown(self):
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285 self.sock.close()
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286
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287 def testRecvfromTimeout(self):
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288 # Test recvfrom() timeout
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289 # Prevent "Address already in use" socket exceptions
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290 support.bind_port(self.sock, self.localhost)
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291 self._sock_operation(1, 1.5, 'recvfrom', 1024)
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292
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293
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294 def test_main():
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295 support.requires('network')
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296 support.run_unittest(
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297 CreationTestCase,
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298 TCPTimeoutTestCase,
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299 UDPTimeoutTestCase,
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300 )
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301
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302 if __name__ == "__main__":
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303 test_main()