#!/usr/bin/env python3 # Copyright (c) 2020-2021 The Bitcoin Core developers # Distributed under the MIT software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. """Test block-relay-only anchors functionality""" import os from test_framework.p2p import P2PInterface from test_framework.test_framework import BitcoinTestFramework from test_framework.util import check_node_connections INBOUND_CONNECTIONS = 5 BLOCK_RELAY_CONNECTIONS = 2 class AnchorsTest(BitcoinTestFramework): def set_test_params(self): self.num_nodes = 1 self.disable_autoconnect = False def run_test(self): node_anchors_path = os.path.join( self.nodes[0].datadir, "regtest", "anchors.dat" ) self.log.info("When node starts, check if anchors.dat doesn't exist") assert not os.path.exists(node_anchors_path) self.log.info(f"Add {BLOCK_RELAY_CONNECTIONS} block-relay-only connections to node") for i in range(BLOCK_RELAY_CONNECTIONS): self.log.debug(f"block-relay-only: {i}") self.nodes[0].add_outbound_p2p_connection( P2PInterface(), p2p_idx=i, connection_type="block-relay-only" ) self.log.info(f"Add {INBOUND_CONNECTIONS} inbound connections to node") for i in range(INBOUND_CONNECTIONS): self.log.debug(f"inbound: {i}") self.nodes[0].add_p2p_connection(P2PInterface()) self.log.info("Check node connections") check_node_connections(node=self.nodes[0], num_in=5, num_out=2) # 127.0.0.1 ip = "7f000001" # Since the ip is always 127.0.0.1 for this case, # we store only the port to identify the peers block_relay_nodes_port = [] inbound_nodes_port = [] for p in self.nodes[0].getpeerinfo(): addr_split = p["addr"].split(":") if p["connection_type"] == "block-relay-only": block_relay_nodes_port.append(hex(int(addr_split[1]))[2:]) else: inbound_nodes_port.append(hex(int(addr_split[1]))[2:]) self.log.info("Stop node 0") self.stop_node(0) # It should contain only the block-relay-only addresses self.log.info("Check the addresses in anchors.dat") with open(node_anchors_path, "rb") as file_handler: anchors = file_handler.read() anchors_hex = anchors.hex() for port in block_relay_nodes_port: ip_port = ip + port assert ip_port in anchors_hex for port in inbound_nodes_port: ip_port = ip + port assert ip_port not in anchors_hex self.log.info("Perturb anchors.dat to test it doesn't throw an error during initialization") with self.nodes[0].assert_debug_log(["0 block-relay-only anchors will be tried for connections."]): with open(node_anchors_path, "wb") as out_file_handler: tweaked_contents = bytearray(anchors) tweaked_contents[20:20] = b'1' out_file_handler.write(bytes(tweaked_contents)) self.log.info("Start node") self.start_node(0) self.log.info("When node starts, check if anchors.dat doesn't exist anymore") assert not os.path.exists(node_anchors_path) if __name__ == "__main__": AnchorsTest().main()