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#!/usr/bin/env python3
# Copyright (c) 2021-present 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 v2 transport
"""
import socket
from test_framework.messages import MAGIC_BYTES, NODE_P2P_V2
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import (
assert_equal,
p2p_port,
assert_raises_rpc_error
)
class V2TransportTest(BitcoinTestFramework):
def set_test_params(self):
self.setup_clean_chain = True
self.num_nodes = 5
self.extra_args = [["-v2transport=1"], ["-v2transport=1"], ["-v2transport=0"], ["-v2transport=0"], ["-v2transport=0"]]
def run_test(self):
sending_handshake = "start sending v2 handshake to peer"
downgrading_to_v1 = "retrying with v1 transport protocol for peer"
self.disconnect_nodes(0, 1)
self.disconnect_nodes(1, 2)
self.disconnect_nodes(2, 3)
self.disconnect_nodes(3, 4)
# verify local services
network_info = self.nodes[2].getnetworkinfo()
assert_equal(int(network_info["localservices"], 16) & NODE_P2P_V2, 0)
assert "P2P_V2" not in network_info["localservicesnames"]
network_info = self.nodes[1].getnetworkinfo()
assert_equal(int(network_info["localservices"], 16) & NODE_P2P_V2, NODE_P2P_V2)
assert "P2P_V2" in network_info["localservicesnames"]
# V2 nodes can sync with V2 nodes
assert_equal(self.nodes[0].getblockcount(), 0)
assert_equal(self.nodes[1].getblockcount(), 0)
with self.nodes[0].assert_debug_log(expected_msgs=[sending_handshake],
unexpected_msgs=[downgrading_to_v1]):
self.connect_nodes(0, 1, peer_advertises_v2=True)
self.generate(self.nodes[0], 5, sync_fun=lambda: self.sync_all(self.nodes[0:2]))
assert_equal(self.nodes[1].getblockcount(), 5)
# verify there is a v2 connection between node 0 and 1
node_0_info = self.nodes[0].getpeerinfo()
node_1_info = self.nodes[1].getpeerinfo()
assert_equal(len(node_0_info), 1)
assert_equal(len(node_1_info), 1)
assert_equal(node_0_info[0]["transport_protocol_type"], "v2")
assert_equal(node_1_info[0]["transport_protocol_type"], "v2")
assert_equal(len(node_0_info[0]["session_id"]), 64)
assert_equal(len(node_1_info[0]["session_id"]), 64)
assert_equal(node_0_info[0]["session_id"], node_1_info[0]["session_id"])
# V1 nodes can sync with each other
assert_equal(self.nodes[2].getblockcount(), 0)
assert_equal(self.nodes[3].getblockcount(), 0)
# addnode rpc error when v2transport requested but not enabled
ip_port = "127.0.0.1:{}".format(p2p_port(3))
assert_raises_rpc_error(-8, "Error: v2transport requested but not enabled (see -v2transport)", self.nodes[2].addnode, node=ip_port, command='add', v2transport=True)
with self.nodes[2].assert_debug_log(expected_msgs=[],
unexpected_msgs=[sending_handshake, downgrading_to_v1]):
self.connect_nodes(2, 3, peer_advertises_v2=False)
self.generate(self.nodes[2], 8, sync_fun=lambda: self.sync_all(self.nodes[2:4]))
assert_equal(self.nodes[3].getblockcount(), 8)
assert self.nodes[0].getbestblockhash() != self.nodes[2].getbestblockhash()
# verify there is a v1 connection between node 2 and 3
node_2_info = self.nodes[2].getpeerinfo()
node_3_info = self.nodes[3].getpeerinfo()
assert_equal(len(node_2_info), 1)
assert_equal(len(node_3_info), 1)
assert_equal(node_2_info[0]["transport_protocol_type"], "v1")
assert_equal(node_3_info[0]["transport_protocol_type"], "v1")
assert_equal(len(node_2_info[0]["session_id"]), 0)
assert_equal(len(node_3_info[0]["session_id"]), 0)
# V1 nodes can sync with V2 nodes
self.disconnect_nodes(0, 1)
self.disconnect_nodes(2, 3)
with self.nodes[2].assert_debug_log(expected_msgs=[],
unexpected_msgs=[sending_handshake, downgrading_to_v1]):
self.connect_nodes(2, 1, peer_advertises_v2=False) # cannot enable v2 on v1 node
self.sync_all(self.nodes[1:3])
assert_equal(self.nodes[1].getblockcount(), 8)
assert self.nodes[0].getbestblockhash() != self.nodes[1].getbestblockhash()
# verify there is a v1 connection between node 1 and 2
node_1_info = self.nodes[1].getpeerinfo()
node_2_info = self.nodes[2].getpeerinfo()
assert_equal(len(node_1_info), 1)
assert_equal(len(node_2_info), 1)
assert_equal(node_1_info[0]["transport_protocol_type"], "v1")
assert_equal(node_2_info[0]["transport_protocol_type"], "v1")
assert_equal(len(node_1_info[0]["session_id"]), 0)
assert_equal(len(node_2_info[0]["session_id"]), 0)
# V2 nodes can sync with V1 nodes
self.disconnect_nodes(1, 2)
with self.nodes[0].assert_debug_log(expected_msgs=[],
unexpected_msgs=[sending_handshake, downgrading_to_v1]):
self.connect_nodes(0, 3, peer_advertises_v2=False)
self.sync_all([self.nodes[0], self.nodes[3]])
assert_equal(self.nodes[0].getblockcount(), 8)
# verify there is a v1 connection between node 0 and 3
node_0_info = self.nodes[0].getpeerinfo()
node_3_info = self.nodes[3].getpeerinfo()
assert_equal(len(node_0_info), 1)
assert_equal(len(node_3_info), 1)
assert_equal(node_0_info[0]["transport_protocol_type"], "v1")
assert_equal(node_3_info[0]["transport_protocol_type"], "v1")
assert_equal(len(node_0_info[0]["session_id"]), 0)
assert_equal(len(node_3_info[0]["session_id"]), 0)
# V2 node mines another block and everyone gets it
self.connect_nodes(0, 1, peer_advertises_v2=True)
self.connect_nodes(1, 2, peer_advertises_v2=False)
self.generate(self.nodes[1], 1, sync_fun=lambda: self.sync_all(self.nodes[0:4]))
assert_equal(self.nodes[0].getblockcount(), 9) # sync_all() verifies tip hashes match
# V1 node mines another block and everyone gets it
self.generate(self.nodes[3], 2, sync_fun=lambda: self.sync_all(self.nodes[0:4]))
assert_equal(self.nodes[2].getblockcount(), 11) # sync_all() verifies tip hashes match
assert_equal(self.nodes[4].getblockcount(), 0)
# Peer 4 is v1 p2p, but is falsely advertised as v2.
with self.nodes[1].assert_debug_log(expected_msgs=[sending_handshake, downgrading_to_v1]):
self.connect_nodes(1, 4, peer_advertises_v2=True)
self.sync_all()
assert_equal(self.nodes[4].getblockcount(), 11)
# Check v1 prefix detection
V1_PREFIX = MAGIC_BYTES["regtest"] + b"version\x00\x00\x00\x00\x00"
assert_equal(len(V1_PREFIX), 16)
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
with self.nodes[0].wait_for_new_peer():
s.connect(("127.0.0.1", p2p_port(0)))
s.sendall(V1_PREFIX[:-1])
assert_equal(self.nodes[0].getpeerinfo()[-1]["transport_protocol_type"], "detecting")
s.sendall(bytes([V1_PREFIX[-1]])) # send out last prefix byte
self.wait_until(lambda: self.nodes[0].getpeerinfo()[-1]["transport_protocol_type"] == "v1")
# Check wrong network prefix detection (hits if the next 12 bytes correspond to a v1 version message)
wrong_network_magic_prefix = MAGIC_BYTES["signet"] + V1_PREFIX[4:]
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
with self.nodes[0].wait_for_new_peer():
s.connect(("127.0.0.1", p2p_port(0)))
with self.nodes[0].assert_debug_log(["V2 transport error: V1 peer with wrong MessageStart"]):
s.sendall(wrong_network_magic_prefix + b"somepayload")
# Check detection of missing garbage terminator (hits after fixed amount of data if terminator never matches garbage)
MAX_KEY_GARB_AND_GARBTERM_LEN = 64 + 4095 + 16
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
with self.nodes[0].wait_for_new_peer():
s.connect(("127.0.0.1", p2p_port(0)))
s.sendall(b'\x00' * (MAX_KEY_GARB_AND_GARBTERM_LEN - 1))
self.wait_until(lambda: self.nodes[0].getpeerinfo()[-1]["bytesrecv"] == MAX_KEY_GARB_AND_GARBTERM_LEN - 1)
with self.nodes[0].assert_debug_log(["V2 transport error: missing garbage terminator"]):
peer_id = self.nodes[0].getpeerinfo()[-1]["id"]
s.sendall(b'\x00') # send out last byte
# should disconnect immediately
self.wait_until(lambda: not peer_id in [p["id"] for p in self.nodes[0].getpeerinfo()])
if __name__ == '__main__':
V2TransportTest().main()
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