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#!/usr/bin/env python3
# Copyright (c) 2017 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 message sending before handshake completion.
A node should never send anything other than VERSION/VERACK/REJECT until it's
received a VERACK.
This test connects to a node and sends it a few messages, trying to intice it
into sending us something it shouldn't.
Also test that nodes that send unsupported service bits to bitcoind are disconnected
and don't receive a VERACK. Unsupported service bits are currently 1 << 5 and
1 << 7 (until August 1st 2018)."""
from test_framework.mininode import *
from test_framework.test_framework import BitcoinTestFramework
from test_framework.util import *
banscore = 10
class CLazyNode(NodeConnCB):
def __init__(self):
super().__init__()
self.unexpected_msg = False
self.ever_connected = False
def bad_message(self, message):
self.unexpected_msg = True
self.log.info("should not have received message: %s" % message.command)
def on_open(self, conn):
self.connected = True
self.ever_connected = True
def on_version(self, conn, message): self.bad_message(message)
def on_verack(self, conn, message): self.bad_message(message)
def on_reject(self, conn, message): self.bad_message(message)
def on_inv(self, conn, message): self.bad_message(message)
def on_addr(self, conn, message): self.bad_message(message)
def on_alert(self, conn, message): self.bad_message(message)
def on_getdata(self, conn, message): self.bad_message(message)
def on_getblocks(self, conn, message): self.bad_message(message)
def on_tx(self, conn, message): self.bad_message(message)
def on_block(self, conn, message): self.bad_message(message)
def on_getaddr(self, conn, message): self.bad_message(message)
def on_headers(self, conn, message): self.bad_message(message)
def on_getheaders(self, conn, message): self.bad_message(message)
def on_ping(self, conn, message): self.bad_message(message)
def on_mempool(self, conn): self.bad_message(message)
def on_pong(self, conn, message): self.bad_message(message)
def on_feefilter(self, conn, message): self.bad_message(message)
def on_sendheaders(self, conn, message): self.bad_message(message)
def on_sendcmpct(self, conn, message): self.bad_message(message)
def on_cmpctblock(self, conn, message): self.bad_message(message)
def on_getblocktxn(self, conn, message): self.bad_message(message)
def on_blocktxn(self, conn, message): self.bad_message(message)
# Node that never sends a version. We'll use this to send a bunch of messages
# anyway, and eventually get disconnected.
class CNodeNoVersionBan(CLazyNode):
# send a bunch of veracks without sending a message. This should get us disconnected.
# NOTE: implementation-specific check here. Remove if bitcoind ban behavior changes
def on_open(self, conn):
super().on_open(conn)
for i in range(banscore):
self.send_message(msg_verack())
def on_reject(self, conn, message): pass
# Node that never sends a version. This one just sits idle and hopes to receive
# any message (it shouldn't!)
class CNodeNoVersionIdle(CLazyNode):
def __init__(self):
super().__init__()
# Node that sends a version but not a verack.
class CNodeNoVerackIdle(CLazyNode):
def __init__(self):
self.version_received = False
super().__init__()
def on_reject(self, conn, message): pass
def on_verack(self, conn, message): pass
# When version is received, don't reply with a verack. Instead, see if the
# node will give us a message that it shouldn't. This is not an exhaustive
# list!
def on_version(self, conn, message):
self.version_received = True
conn.send_message(msg_ping())
conn.send_message(msg_getaddr())
class P2PLeakTest(BitcoinTestFramework):
def set_test_params(self):
self.num_nodes = 1
self.extra_args = [['-banscore='+str(banscore)]]
def run_test(self):
no_version_bannode = CNodeNoVersionBan()
no_version_idlenode = CNodeNoVersionIdle()
no_verack_idlenode = CNodeNoVerackIdle()
unsupported_service_bit5_node = CLazyNode()
unsupported_service_bit7_node = CLazyNode()
self.nodes[0].setmocktime(1501545600) # August 1st 2017
connections = []
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_bannode, send_version=False))
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_version_idlenode, send_version=False))
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], no_verack_idlenode))
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], unsupported_service_bit5_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_5))
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], unsupported_service_bit7_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_7))
no_version_bannode.add_connection(connections[0])
no_version_idlenode.add_connection(connections[1])
no_verack_idlenode.add_connection(connections[2])
unsupported_service_bit5_node.add_connection(connections[3])
unsupported_service_bit7_node.add_connection(connections[4])
NetworkThread().start() # Start up network handling in another thread
wait_until(lambda: no_version_bannode.ever_connected, timeout=10, lock=mininode_lock)
wait_until(lambda: no_version_idlenode.ever_connected, timeout=10, lock=mininode_lock)
wait_until(lambda: no_verack_idlenode.version_received, timeout=10, lock=mininode_lock)
wait_until(lambda: unsupported_service_bit5_node.ever_connected, timeout=10, lock=mininode_lock)
wait_until(lambda: unsupported_service_bit7_node.ever_connected, timeout=10, lock=mininode_lock)
# Mine a block and make sure that it's not sent to the connected nodes
self.nodes[0].generate(1)
#Give the node enough time to possibly leak out a message
time.sleep(5)
#This node should have been banned
assert not no_version_bannode.connected
# These nodes should have been disconnected
assert not unsupported_service_bit5_node.connected
assert not unsupported_service_bit7_node.connected
[conn.disconnect_node() for conn in connections]
# Wait until all connections are closed
wait_until(lambda: len(self.nodes[0].getpeerinfo()) == 0)
# Make sure no unexpected messages came in
assert(no_version_bannode.unexpected_msg == False)
assert(no_version_idlenode.unexpected_msg == False)
assert(no_verack_idlenode.unexpected_msg == False)
assert not unsupported_service_bit5_node.unexpected_msg
assert not unsupported_service_bit7_node.unexpected_msg
self.log.info("Service bits 5 and 7 are allowed after August 1st 2018")
self.nodes[0].setmocktime(1533168000) # August 2nd 2018
allowed_service_bit5_node = NodeConnCB()
allowed_service_bit7_node = NodeConnCB()
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], allowed_service_bit5_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_5))
connections.append(NodeConn('127.0.0.1', p2p_port(0), self.nodes[0], allowed_service_bit7_node, services=NODE_NETWORK|NODE_UNSUPPORTED_SERVICE_BIT_7))
allowed_service_bit5_node.add_connection(connections[5])
allowed_service_bit7_node.add_connection(connections[6])
NetworkThread().start() # Network thread stopped when all previous NodeConnCBs disconnected. Restart it
wait_until(lambda: allowed_service_bit5_node.message_count["verack"], lock=mininode_lock)
wait_until(lambda: allowed_service_bit7_node.message_count["verack"], lock=mininode_lock)
if __name__ == '__main__':
P2PLeakTest().main()
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