# 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 binascii import time import sys import random import cStringIO import hashlib from threading import Lock from threading import Thread import logging import copy BIP0031_VERSION = 60000 MY_VERSION = 60001 # past bip-31 for ping/pong MY_SUBVERSION = "/python-mininode-tester:0.0.1/" MAX_INV_SZ = 50000 # 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() # 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 = "" 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(" 21000000L * 100000000L: 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.calc_sha256() 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 = "" self.strStatusBar = "" self.strReserved = "" 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 = "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 = "reject" def __init__(self): self.message = "" self.code = "" 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 # The actual NodeConn class # This class provides an interface for a p2p connection to a specified node class NodeConn(asyncore.dispatcher): messagemap = { "version": msg_version, "verack": msg_verack, "addr": msg_addr, "alert": msg_alert, "inv": msg_inv, "getdata": msg_getdata, "getblocks": msg_getblocks, "tx": msg_tx, "block": msg_block, "getaddr": msg_getaddr, "ping": msg_ping, "pong": msg_pong, "headers": msg_headers, "getheaders": msg_getheaders, "reject": msg_reject, "mempool": msg_mempool } MAGIC_BYTES = { "mainnet": "\xf9\xbe\xb4\xd9", # mainnet "testnet3": "\x0b\x11\x09\x07", # testnet3 "regtest": "\xfa\xbf\xb5\xda" # regtest } def __init__(self, dstaddr, dstport, rpc, callback, net="regtest"): 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 = "" self.recvbuf = "" self.ver_send = 209 self.ver_recv = 209 self.last_sent = 0 self.state = "connecting" self.network = net self.cb = callback self.sendbufLock = Lock() # for protecting the sendbuffer self.disconnect = False # stuff version msg into sendbuf vt = msg_version() 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 = "" self.sendbuf = "" 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): self.sendbufLock.acquire() length = len(self.sendbuf) self.sendbufLock.release() return (length > 0) def handle_write(self): self.sendbufLock.acquire() try: sent = self.send(self.sendbuf) except: self.handle_close() return self.sendbuf = self.sendbuf[sent:] self.sendbufLock.release() def got_data(self): 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("\x00", 1)[0] msglen = struct.unpack("= 209: th = sha256(data) h = sha256(th) tmsg += h[:4] tmsg += data self.sendbuf += tmsg self.last_sent = time.time() self.sendbufLock.release() def got_message(self, message): if message.command == "version": if message.nVersion <= BIP0031_VERSION: self.messagemap['ping'] = msg_ping_prebip31 if self.last_sent + 30 * 60 < time.time(): self.send_message(self.messagemap['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)