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#!/usr/bin/env python3
# Copyright (c) 2010 ArtForz -- public domain half-a-node
# Copyright (c) 2012 Jeff Garzik
# Copyright (c) 2010-2016 The Bitcoin Core developers
# Distributed under the MIT software license, see the accompanying
# file COPYING or http://www.opensource.org/licenses/mit-license.php.
"""Bitcoin P2P network half-a-node.
This python code was modified from ArtForz' public domain half-a-node, as
found in the mini-node branch of http://github.com/jgarzik/pynode.
NodeConn: an object which manages p2p connectivity to a bitcoin node
NodeConnCB: a base class that describes the interface for receiving
callbacks with network messages from a NodeConn
"""
import asyncore
from collections import defaultdict
from io import BytesIO
import logging
import socket
import struct
import sys
import time
from threading import RLock, Thread
from test_framework.messages import *
logger = logging.getLogger("TestFramework.mininode")
# Keep our own socket map for asyncore, so that we can track disconnects
# ourselves (to workaround an issue with closing an asyncore socket when
# using select)
mininode_socket_map = dict()
# One lock for synchronizing all data access between the networking thread (see
# NetworkThread below) and the thread running the test logic. For simplicity,
# NodeConn acquires this lock whenever delivering a message to a NodeConnCB,
# and whenever adding anything to the send buffer (in send_message()). This
# lock should be acquired in the thread running the test logic to synchronize
# access to any data shared with the NodeConnCB or NodeConn.
mininode_lock = RLock()
class NodeConnCB():
"""Callback and helper functions for P2P connection to a bitcoind node.
Individual testcases should subclass this and override the on_* methods
if they want to alter message handling behaviour."""
def __init__(self):
# Track whether we have a P2P connection open to the node
self.connected = False
self.connection = None
# Track number of messages of each type received and the most recent
# message of each type
self.message_count = defaultdict(int)
self.last_message = {}
# A count of the number of ping messages we've sent to the node
self.ping_counter = 1
# Message receiving methods
def deliver(self, conn, message):
"""Receive message and dispatch message to appropriate callback.
We keep a count of how many of each message type has been received
and the most recent message of each type."""
with mininode_lock:
try:
command = message.command.decode('ascii')
self.message_count[command] += 1
self.last_message[command] = message
getattr(self, 'on_' + command)(conn, message)
except:
print("ERROR delivering %s (%s)" % (repr(message),
sys.exc_info()[0]))
raise
# Callback methods. Can be overridden by subclasses in individual test
# cases to provide custom message handling behaviour.
def on_open(self, conn):
self.connected = True
def on_close(self, conn):
self.connected = False
self.connection = None
def on_addr(self, conn, message): pass
def on_block(self, conn, message): pass
def on_blocktxn(self, conn, message): pass
def on_cmpctblock(self, conn, message): pass
def on_feefilter(self, conn, message): pass
def on_getaddr(self, conn, message): pass
def on_getblocks(self, conn, message): pass
def on_getblocktxn(self, conn, message): pass
def on_getdata(self, conn, message): pass
def on_getheaders(self, conn, message): pass
def on_headers(self, conn, message): pass
def on_mempool(self, conn): pass
def on_pong(self, conn, message): pass
def on_reject(self, conn, message): pass
def on_sendcmpct(self, conn, message): pass
def on_sendheaders(self, conn, message): pass
def on_tx(self, conn, message): pass
def on_inv(self, conn, message):
want = msg_getdata()
for i in message.inv:
if i.type != 0:
want.inv.append(i)
if len(want.inv):
conn.send_message(want)
def on_ping(self, conn, message):
conn.send_message(msg_pong(message.nonce))
def on_verack(self, conn, message):
conn.ver_recv = conn.ver_send
self.verack_received = True
def on_version(self, conn, message):
assert message.nVersion >= MIN_VERSION_SUPPORTED, "Version {} received. Test framework only supports versions greater than {}".format(message.nVersion, MIN_VERSION_SUPPORTED)
conn.send_message(msg_verack())
conn.nServices = message.nServices
# Connection helper methods
def add_connection(self, conn):
self.connection = conn
def wait_for_disconnect(self, timeout=60):
test_function = lambda: not self.connected
wait_until(test_function, timeout=timeout, lock=mininode_lock)
# Message receiving helper methods
def wait_for_block(self, blockhash, timeout=60):
test_function = lambda: self.last_message.get("block") and self.last_message["block"].block.rehash() == blockhash
wait_until(test_function, timeout=timeout, lock=mininode_lock)
def wait_for_getdata(self, timeout=60):
test_function = lambda: self.last_message.get("getdata")
wait_until(test_function, timeout=timeout, lock=mininode_lock)
def wait_for_getheaders(self, timeout=60):
test_function = lambda: self.last_message.get("getheaders")
wait_until(test_function, timeout=timeout, lock=mininode_lock)
def wait_for_inv(self, expected_inv, timeout=60):
"""Waits for an INV message and checks that the first inv object in the message was as expected."""
if len(expected_inv) > 1:
raise NotImplementedError("wait_for_inv() will only verify the first inv object")
test_function = lambda: self.last_message.get("inv") and \
self.last_message["inv"].inv[0].type == expected_inv[0].type and \
self.last_message["inv"].inv[0].hash == expected_inv[0].hash
wait_until(test_function, timeout=timeout, lock=mininode_lock)
def wait_for_verack(self, timeout=60):
test_function = lambda: self.message_count["verack"]
wait_until(test_function, timeout=timeout, lock=mininode_lock)
# Message sending helper functions
def send_message(self, message):
if self.connection:
self.connection.send_message(message)
else:
logger.error("Cannot send message. No connection to node!")
def send_and_ping(self, message):
self.send_message(message)
self.sync_with_ping()
# Sync up with the node
def sync_with_ping(self, timeout=60):
self.send_message(msg_ping(nonce=self.ping_counter))
test_function = lambda: self.last_message.get("pong") and self.last_message["pong"].nonce == self.ping_counter
wait_until(test_function, timeout=timeout, lock=mininode_lock)
self.ping_counter += 1
class NodeConn(asyncore.dispatcher):
"""The actual NodeConn class
This class provides an interface for a p2p connection to a specified node."""
messagemap = {
b"version": msg_version,
b"verack": msg_verack,
b"addr": msg_addr,
b"inv": msg_inv,
b"getdata": msg_getdata,
b"getblocks": msg_getblocks,
b"tx": msg_tx,
b"block": msg_block,
b"getaddr": msg_getaddr,
b"ping": msg_ping,
b"pong": msg_pong,
b"headers": msg_headers,
b"getheaders": msg_getheaders,
b"reject": msg_reject,
b"mempool": msg_mempool,
b"feefilter": msg_feefilter,
b"sendheaders": msg_sendheaders,
b"sendcmpct": msg_sendcmpct,
b"cmpctblock": msg_cmpctblock,
b"getblocktxn": msg_getblocktxn,
b"blocktxn": msg_blocktxn
}
MAGIC_BYTES = {
"mainnet": b"\xf9\xbe\xb4\xd9", # mainnet
"testnet3": b"\x0b\x11\x09\x07", # testnet3
"regtest": b"\xfa\xbf\xb5\xda", # regtest
}
def __init__(self, dstaddr, dstport, rpc, callback, net="regtest", services=NODE_NETWORK|NODE_WITNESS, send_version=True):
asyncore.dispatcher.__init__(self, map=mininode_socket_map)
self.dstaddr = dstaddr
self.dstport = dstport
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
self.sendbuf = b""
self.recvbuf = b""
self.ver_send = 209
self.ver_recv = 209
self.last_sent = 0
self.state = "connecting"
self.network = net
self.cb = callback
self.disconnect = False
self.nServices = 0
if send_version:
# stuff version msg into sendbuf
vt = msg_version()
vt.nServices = services
vt.addrTo.ip = self.dstaddr
vt.addrTo.port = self.dstport
vt.addrFrom.ip = "0.0.0.0"
vt.addrFrom.port = 0
self.send_message(vt, True)
logger.info('Connecting to Bitcoin Node: %s:%d' % (self.dstaddr, self.dstport))
try:
self.connect((dstaddr, dstport))
except:
self.handle_close()
self.rpc = rpc
def handle_connect(self):
if self.state != "connected":
logger.debug("Connected & Listening: %s:%d" % (self.dstaddr, self.dstport))
self.state = "connected"
self.cb.on_open(self)
def handle_close(self):
logger.debug("Closing connection to: %s:%d" % (self.dstaddr, self.dstport))
self.state = "closed"
self.recvbuf = b""
self.sendbuf = b""
try:
self.close()
except:
pass
self.cb.on_close(self)
def handle_read(self):
t = self.recv(8192)
if len(t) > 0:
self.recvbuf += t
self.got_data()
def readable(self):
return True
def writable(self):
with mininode_lock:
pre_connection = self.state == "connecting"
length = len(self.sendbuf)
return (length > 0 or pre_connection)
def handle_write(self):
with mininode_lock:
# asyncore does not expose socket connection, only the first read/write
# event, thus we must check connection manually here to know when we
# actually connect
if self.state == "connecting":
self.handle_connect()
if not self.writable():
return
try:
sent = self.send(self.sendbuf)
except:
self.handle_close()
return
self.sendbuf = self.sendbuf[sent:]
def got_data(self):
try:
while True:
if len(self.recvbuf) < 4:
return
if self.recvbuf[:4] != self.MAGIC_BYTES[self.network]:
raise ValueError("got garbage %s" % repr(self.recvbuf))
if len(self.recvbuf) < 4 + 12 + 4 + 4:
return
command = self.recvbuf[4:4+12].split(b"\x00", 1)[0]
msglen = struct.unpack("<i", self.recvbuf[4+12:4+12+4])[0]
checksum = self.recvbuf[4+12+4:4+12+4+4]
if len(self.recvbuf) < 4 + 12 + 4 + 4 + msglen:
return
msg = self.recvbuf[4+12+4+4:4+12+4+4+msglen]
th = sha256(msg)
h = sha256(th)
if checksum != h[:4]:
raise ValueError("got bad checksum " + repr(self.recvbuf))
self.recvbuf = self.recvbuf[4+12+4+4+msglen:]
if command not in self.messagemap:
raise ValueError("Received unknown command from %s:%d: '%s' %s" % (self.dstaddr, self.dstport, command, repr(msg)))
f = BytesIO(msg)
t = self.messagemap[command]()
t.deserialize(f)
self.got_message(t)
except Exception as e:
logger.exception('Error reading message:', repr(e))
raise
def send_message(self, message, pushbuf=False):
if self.state != "connected" and not pushbuf:
raise IOError('Not connected, no pushbuf')
self._log_message("send", message)
command = message.command
data = message.serialize()
tmsg = self.MAGIC_BYTES[self.network]
tmsg += command
tmsg += b"\x00" * (12 - len(command))
tmsg += struct.pack("<I", len(data))
th = sha256(data)
h = sha256(th)
tmsg += h[:4]
tmsg += data
with mininode_lock:
if (len(self.sendbuf) == 0 and not pushbuf):
try:
sent = self.send(tmsg)
self.sendbuf = tmsg[sent:]
except BlockingIOError:
self.sendbuf = tmsg
else:
self.sendbuf += tmsg
self.last_sent = time.time()
def got_message(self, message):
if self.last_sent + 30 * 60 < time.time():
self.send_message(self.messagemap[b'ping']())
self._log_message("receive", message)
self.cb.deliver(self, message)
def _log_message(self, direction, msg):
if direction == "send":
log_message = "Send message to "
elif direction == "receive":
log_message = "Received message from "
log_message += "%s:%d: %s" % (self.dstaddr, self.dstport, repr(msg)[:500])
if len(log_message) > 500:
log_message += "... (msg truncated)"
logger.debug(log_message)
def disconnect_node(self):
self.disconnect = True
class NetworkThread(Thread):
def run(self):
while mininode_socket_map:
# We check for whether to disconnect outside of the asyncore
# loop to workaround the behavior of asyncore when using
# select
disconnected = []
for fd, obj in mininode_socket_map.items():
if obj.disconnect:
disconnected.append(obj)
[ obj.handle_close() for obj in disconnected ]
asyncore.loop(0.1, use_poll=True, map=mininode_socket_map, count=1)
logger.debug("Network thread closing")