# mininode.py - Bitcoin P2P network half-a-node # # Distributed under the MIT/X11 software license, see the accompanying # file COPYING or http://www.opensource.org/licenses/mit-license.php. # # 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 # CBlock, CTransaction, CBlockHeader, CTxIn, CTxOut, etc....: # data structures that should map to corresponding structures in # bitcoin/primitives # msg_block, msg_tx, msg_headers, etc.: # data structures that represent network messages # ser_*, deser_*: functions that handle serialization/deserialization import struct import socket import asyncore import time import sys import random from binascii import hexlify, unhexlify from io import BytesIO from codecs import encode import hashlib from threading import RLock from threading import Thread import logging import copy BIP0031_VERSION = 60000 MY_VERSION = 60001 # past bip-31 for ping/pong MY_SUBVERSION = b"/python-mininode-tester:0.0.2/" MAX_INV_SZ = 50000 MAX_BLOCK_SIZE = 1000000 COIN = 100000000L # 1 btc in satoshis # 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 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() # Serialization/deserialization tools def sha256(s): return hashlib.new('sha256', s).digest() def hash256(s): return sha256(sha256(s)) def deser_string(f): nit = struct.unpack(">= 32 return rs def uint256_from_str(s): r = 0L t = struct.unpack("> 24) & 0xFF v = (c & 0xFFFFFFL) << (8 * (nbytes - 3)) return v def deser_vector(f, c): nit = struct.unpack("H", f.read(2))[0] def serialize(self): r = b"" r += struct.pack("H", self.port) return r def __repr__(self): return "CAddress(nServices=%i ip=%s port=%i)" % (self.nServices, self.ip, self.port) class CInv(object): typemap = { 0: "Error", 1: "TX", 2: "Block"} def __init__(self, t=0, h=0L): self.type = t self.hash = h def deserialize(self, f): self.type = struct.unpack(" 21000000 * COIN: return False return True def __repr__(self): return "CTransaction(nVersion=%i vin=%s vout=%s nLockTime=%i)" \ % (self.nVersion, repr(self.vin), repr(self.vout), self.nLockTime) class CBlockHeader(object): def __init__(self, header=None): if header is None: self.set_null() else: self.nVersion = header.nVersion self.hashPrevBlock = header.hashPrevBlock self.hashMerkleRoot = header.hashMerkleRoot self.nTime = header.nTime self.nBits = header.nBits self.nNonce = header.nNonce self.sha256 = header.sha256 self.hash = header.hash self.calc_sha256() def set_null(self): self.nVersion = 1 self.hashPrevBlock = 0 self.hashMerkleRoot = 0 self.nTime = 0 self.nBits = 0 self.nNonce = 0 self.sha256 = None self.hash = None def deserialize(self, f): self.nVersion = struct.unpack(" 1: newhashes = [] for i in xrange(0, len(hashes), 2): i2 = min(i+1, len(hashes)-1) newhashes.append(hash256(hashes[i] + hashes[i2])) hashes = newhashes return uint256_from_str(hashes[0]) def is_valid(self): self.calc_sha256() target = uint256_from_compact(self.nBits) if self.sha256 > target: return False for tx in self.vtx: if not tx.is_valid(): return False if self.calc_merkle_root() != self.hashMerkleRoot: return False return True def solve(self): self.rehash() target = uint256_from_compact(self.nBits) while self.sha256 > target: self.nNonce += 1 self.rehash() def __repr__(self): return "CBlock(nVersion=%i hashPrevBlock=%064x hashMerkleRoot=%064x nTime=%s nBits=%08x nNonce=%08x vtx=%s)" \ % (self.nVersion, self.hashPrevBlock, self.hashMerkleRoot, time.ctime(self.nTime), self.nBits, self.nNonce, repr(self.vtx)) class CUnsignedAlert(object): def __init__(self): self.nVersion = 1 self.nRelayUntil = 0 self.nExpiration = 0 self.nID = 0 self.nCancel = 0 self.setCancel = [] self.nMinVer = 0 self.nMaxVer = 0 self.setSubVer = [] self.nPriority = 0 self.strComment = b"" self.strStatusBar = b"" self.strReserved = b"" def deserialize(self, f): self.nVersion = struct.unpack("= 106: self.addrFrom = CAddress() self.addrFrom.deserialize(f) self.nNonce = struct.unpack("= 209: self.nStartingHeight = struct.unpack(" class msg_headers(object): command = b"headers" def __init__(self): self.headers = [] def deserialize(self, f): # comment in bitcoind indicates these should be deserialized as blocks blocks = deser_vector(f, CBlock) for x in blocks: self.headers.append(CBlockHeader(x)) def serialize(self): blocks = [CBlock(x) for x in self.headers] return ser_vector(blocks) def __repr__(self): return "msg_headers(headers=%s)" % repr(self.headers) class msg_reject(object): command = b"reject" def __init__(self): self.message = b"" self.code = 0 self.reason = "" self.data = 0L def deserialize(self, f): self.message = deser_string(f) self.code = struct.unpack("= 209: conn.send_message(msg_verack()) conn.ver_send = min(MY_VERSION, message.nVersion) if message.nVersion < 209: conn.ver_recv = conn.ver_send def on_verack(self, conn, message): conn.ver_recv = conn.ver_send self.verack_received = True 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_addr(self, conn, message): pass def on_alert(self, conn, message): pass def on_getdata(self, conn, message): pass def on_getblocks(self, conn, message): pass def on_tx(self, conn, message): pass def on_block(self, conn, message): pass def on_getaddr(self, conn, message): pass def on_headers(self, conn, message): pass def on_getheaders(self, conn, message): pass def on_ping(self, conn, message): if conn.ver_send > BIP0031_VERSION: conn.send_message(msg_pong(message.nonce)) def on_reject(self, conn, message): pass def on_close(self, conn): pass def on_mempool(self, conn): pass def on_pong(self, conn, message): pass def on_feefilter(self, conn, message): pass # More useful callbacks and functions for NodeConnCB's which have a single NodeConn class SingleNodeConnCB(NodeConnCB): def __init__(self): NodeConnCB.__init__(self) self.connection = None self.ping_counter = 1 self.last_pong = msg_pong() def add_connection(self, conn): self.connection = conn # Wrapper for the NodeConn's send_message function def send_message(self, message): self.connection.send_message(message) def on_pong(self, conn, message): self.last_pong = message # Sync up with the node def sync_with_ping(self, timeout=30): def received_pong(): return (self.last_pong.nonce == self.ping_counter) self.send_message(msg_ping(nonce=self.ping_counter)) success = wait_until(received_pong, timeout) self.ping_counter += 1 return success # The actual NodeConn class # This class provides an interface for a p2p connection to a specified node class NodeConn(asyncore.dispatcher): messagemap = { b"version": msg_version, b"verack": msg_verack, b"addr": msg_addr, b"alert": msg_alert, 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 } 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=1): asyncore.dispatcher.__init__(self, map=mininode_socket_map) self.log = logging.getLogger("NodeConn(%s:%d)" % (dstaddr, dstport)) self.dstaddr = dstaddr self.dstport = dstport self.create_socket(socket.AF_INET, socket.SOCK_STREAM) 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 # 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) print 'MiniNode: Connecting to Bitcoin Node IP # ' + dstaddr + ':' \ + str(dstport) try: self.connect((dstaddr, dstport)) except: self.handle_close() self.rpc = rpc def show_debug_msg(self, msg): self.log.debug(msg) def handle_connect(self): self.show_debug_msg("MiniNode: Connected & Listening: \n") self.state = "connected" def handle_close(self): self.show_debug_msg("MiniNode: 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): try: t = self.recv(8192) if len(t) > 0: self.recvbuf += t self.got_data() except: pass def readable(self): return True def writable(self): with mininode_lock: length = len(self.sendbuf) return (length > 0) def handle_write(self): with mininode_lock: 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 self.ver_recv < 209: if len(self.recvbuf) < 4 + 12 + 4: return command = self.recvbuf[4:4+12].split(b"\x00", 1)[0] msglen = struct.unpack("= 209: th = sha256(data) h = sha256(th) tmsg += h[:4] tmsg += data with mininode_lock: self.sendbuf += tmsg self.last_sent = time.time() def got_message(self, message): if message.command == b"version": if message.nVersion <= BIP0031_VERSION: self.messagemap[b'ping'] = msg_ping_prebip31 if self.last_sent + 30 * 60 < time.time(): self.send_message(self.messagemap[b'ping']()) self.show_debug_msg("Recv %s" % repr(message)) self.cb.deliver(self, 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) # An exception we can raise if we detect a potential disconnect # (p2p or rpc) before the test is complete class EarlyDisconnectError(Exception): def __init__(self, value): self.value = value def __str__(self): return repr(self.value)