text: #!/usr/bin/env python2
  # Copyright (c) 2015 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  import socket
  import traceback, sys
  from binascii import hexlify
  import time, os
  
  from socks5 import Socks5Configuration, Socks5Command, Socks5Server, AddressType
  from test_framework import BitcoinTestFramework
  from util import *
  '''
  Test plan:
  - Start bitcoind's with different proxy configurations
  - Use addnode to initiate connections
  - Verify that proxies are connected to, and the right connection command is given
  - Proxy configurations to test on bitcoind side:
      - `-proxy` (proxy everything)
      - `-onion` (proxy just onions)
      - `-proxyrandomize` Circuit randomization
  - Proxy configurations to test on proxy side,
      - support no authentication (other proxy)
      - support no authentication + user/pass authentication (Tor)
      - proxy on IPv6
  
  - Create various proxies (as threads)
  - Create bitcoinds that connect to them
  - Manipulate the bitcoinds using addnode (onetry) an observe effects
  
  addnode connect to IPv4
  addnode connect to IPv6
  addnode connect to onion
  addnode connect to generic DNS name
  '''
  
  class ProxyTest(BitcoinTestFramework):
      def __init__(self):
          # Create two proxies on different ports
          # ... one unauthenticated
          self.conf1 = Socks5Configuration()
          self.conf1.addr = ('127.0.0.1', 13000 + (os.getpid() % 1000))
          self.conf1.unauth = True
          self.conf1.auth = False
          # ... one supporting authenticated and unauthenticated (Tor)
          self.conf2 = Socks5Configuration()
          self.conf2.addr = ('127.0.0.1', 14000 + (os.getpid() % 1000))
          self.conf2.unauth = True
          self.conf2.auth = True
          # ... one on IPv6 with similar configuration
          self.conf3 = Socks5Configuration()
          self.conf3.af = socket.AF_INET6
          self.conf3.addr = ('::1', 15000 + (os.getpid() % 1000))
          self.conf3.unauth = True
          self.conf3.auth = True
  
          self.serv1 = Socks5Server(self.conf1)
          self.serv1.start()
          self.serv2 = Socks5Server(self.conf2)
          self.serv2.start()
          self.serv3 = Socks5Server(self.conf3)
          self.serv3.start()
  
      def setup_nodes(self):
          # Note: proxies are not used to connect to local nodes
          # this is because the proxy to use is based on CService.GetNetwork(), which return NET_UNROUTABLE for localhost
          return start_nodes(4, self.options.tmpdir, extra_args=[
              ['-listen', '-debug=net', '-debug=proxy', '-proxy=%s:%i' % (self.conf1.addr),'-proxyrandomize=1'],
              ['-listen', '-debug=net', '-debug=proxy', '-proxy=%s:%i' % (self.conf1.addr),'-onion=%s:%i' % (self.conf2.addr),'-proxyrandomize=0'],
              ['-listen', '-debug=net', '-debug=proxy', '-proxy=%s:%i' % (self.conf2.addr),'-proxyrandomize=1'],
              ['-listen', '-debug=net', '-debug=proxy', '-proxy=[%s]:%i' % (self.conf3.addr),'-proxyrandomize=0']
              ])
  
      def node_test(self, node, proxies, auth):
          rv = []
          # Test: outgoing IPv4 connection through node
          node.addnode("15.61.23.23:1234", "onetry")
          cmd = proxies[0].queue.get()
          assert(isinstance(cmd, Socks5Command))
          # Note: bitcoind's SOCKS5 implementation only sends atyp DOMAINNAME, even if connecting directly to IPv4/IPv6
          assert_equal(cmd.atyp, AddressType.DOMAINNAME)
          assert_equal(cmd.addr, "15.61.23.23")
          assert_equal(cmd.port, 1234)
          if not auth:
              assert_equal(cmd.username, None)
              assert_equal(cmd.password, None)
          rv.append(cmd)
  
          # Test: outgoing IPv6 connection through node
          node.addnode("[1233:3432:2434:2343:3234:2345:6546:4534]:5443", "onetry")
          cmd = proxies[1].queue.get()
          assert(isinstance(cmd, Socks5Command))
          # Note: bitcoind's SOCKS5 implementation only sends atyp DOMAINNAME, even if connecting directly to IPv4/IPv6
          assert_equal(cmd.atyp, AddressType.DOMAINNAME)
          assert_equal(cmd.addr, "1233:3432:2434:2343:3234:2345:6546:4534")
          assert_equal(cmd.port, 5443)
          if not auth:
              assert_equal(cmd.username, None)
              assert_equal(cmd.password, None)
          rv.append(cmd)
  
          # Test: outgoing onion connection through node
          node.addnode("timcoinvj7kcklujarx.onion:8062", "onetry")
          cmd = proxies[2].queue.get()
          assert(isinstance(cmd, Socks5Command))
          assert_equal(cmd.atyp, AddressType.DOMAINNAME)
          assert_equal(cmd.addr, "timcoinvj7kcklujarx.onion")
          assert_equal(cmd.port, 8062)
          if not auth:
              assert_equal(cmd.username, None)
              assert_equal(cmd.password, None)
          rv.append(cmd)
  
          # Test: outgoing DNS name connection through node
          node.addnode("node.noumenon:8333", "onetry")
          cmd = proxies[3].queue.get()
          assert(isinstance(cmd, Socks5Command))
          assert_equal(cmd.atyp, AddressType.DOMAINNAME)
          assert_equal(cmd.addr, "node.noumenon")
          assert_equal(cmd.port, 8333)
          if not auth:
              assert_equal(cmd.username, None)
              assert_equal(cmd.password, None)
          rv.append(cmd)
  
          return rv
  
      def run_test(self):
          # basic -proxy
          self.node_test(self.nodes[0], [self.serv1, self.serv1, self.serv1, self.serv1], False)
  
          # -proxy plus -onion
          self.node_test(self.nodes[1], [self.serv1, self.serv1, self.serv2, self.serv1], False)
  
          # -proxy plus -onion, -proxyrandomize
          rv = self.node_test(self.nodes[2], [self.serv2, self.serv2, self.serv2, self.serv2], True)
          # Check that credentials as used for -proxyrandomize connections are unique
          credentials = set((x.username,x.password) for x in rv)
          assert_equal(len(credentials), 4)
  
          # proxy on IPv6 localhost
          self.node_test(self.nodes[3], [self.serv3, self.serv3, self.serv3, self.serv3], False)
  
  if __name__ == '__main__':
      ProxyTest().main()
  