1  #!/usr/bin/env python3
 2  # Copyright (c) 2019-2021 The Bitcoin Core developers
 3  # Distributed under the MIT software license, see the accompanying
 4  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 5  
 6  """
 7  Test seednode interaction with the AddrMan
 8  """
 9  import random
10  import time
11  
12  from test_framework.netutil import UNREACHABLE_PROXY_ARG
13  from test_framework.test_framework import BitcoinTestFramework
14  
15  ADD_NEXT_SEEDNODE = 10
16  
17  
18  class P2PSeedNodes(BitcoinTestFramework):
19      def set_test_params(self):
20          self.num_nodes = 1
21          # Specify a non-working proxy to make sure no actual connections to random IPs are attempted.
22          self.extra_args = [[UNREACHABLE_PROXY_ARG]]
23          self.disable_autoconnect = False
24  
25      def test_no_seednode(self):
26          self.log.info("Check that if no seednode is provided, the node proceeds as usual (without waiting)")
27          with self.nodes[0].assert_debug_log(expected_msgs=[], unexpected_msgs=["Empty addrman, adding seednode", f"Couldn't connect to peers from addrman after {ADD_NEXT_SEEDNODE} seconds. Adding seednode"], timeout=ADD_NEXT_SEEDNODE):
28              self.restart_node(0, extra_args=self.nodes[0].extra_args)
29  
30      def test_seednode_empty_addrman(self):
31          seed_node = "25.0.0.1"
32          self.log.info("Check that the seednode is immediately added on bootstrap on an empty addrman")
33          with self.nodes[0].assert_debug_log(expected_msgs=[f"Empty addrman, adding seednode ({seed_node}) to addrfetch"], timeout=ADD_NEXT_SEEDNODE):
34              self.restart_node(0, extra_args=self.nodes[0].extra_args + [f'-seednode={seed_node}'])
35  
36      def test_seednode_non_empty_addrman(self):
37          self.log.info("Check that if addrman is non-empty, seednodes are queried with a delay")
38          seed_node = "25.0.0.2"
39          node = self.nodes[0]
40          # Fill the addrman with unreachable nodes
41          for i in range(10):
42              ip = f"{random.randrange(128,169)}.{random.randrange(1,255)}.{random.randrange(1,255)}.{random.randrange(1,255)}"
43              port = 8333 + i
44              node.addpeeraddress(ip, port)
45  
46          # Restart the node so seednode is processed again.
47          with node.assert_debug_log(expected_msgs=["trying v1 connection"], timeout=ADD_NEXT_SEEDNODE):
48              self.restart_node(0, extra_args=self.nodes[0].extra_args + [f'-seednode={seed_node}'])
49  
50          with node.assert_debug_log(expected_msgs=[f"Couldn't connect to peers from addrman after {ADD_NEXT_SEEDNODE} seconds. Adding seednode ({seed_node}) to addrfetch"], unexpected_msgs=["Empty addrman, adding seednode"], timeout=ADD_NEXT_SEEDNODE * 1.5):
51              node.setmocktime(int(time.time()) + ADD_NEXT_SEEDNODE + 1)
52  
53      def run_test(self):
54          self.test_no_seednode()
55          self.test_seednode_empty_addrman()
56          self.test_seednode_non_empty_addrman()
57  
58  
59  if __name__ == '__main__':
60      P2PSeedNodes(__file__).main()