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relay.py
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relay.py
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#!/usr/bin/env python
#
# Author Dario Clavijo 2015
# GPLv3
import hashlib
import utils
import socket
import random
import struct
import time
import sys
socket.timeout(5)
magic = 0xd9b4bef9
def makeMessage(magic, command, payload):
checksum = hashlib.sha256(hashlib.sha256(payload).digest()).digest()[:4]
return struct.pack('<L12sL4s', magic, command, len(payload), checksum) + payload
def getVersionMsg():
version = 70002
services = 1
timestamp = int(time.time())
addr_me = utils.netaddr(socket.inet_aton("127.0.0.1"), 8333)
addr_you = utils.netaddr(socket.inet_aton("127.0.0.1"), 8333)
nonce = random.getrandbits(64)
sub_version_num = utils.varstr('')
start_height = 0
payload = struct.pack('<LQQ26s26sQsL', version, services, timestamp, addr_me,
addr_you, nonce, sub_version_num, start_height)
return makeMessage(magic, 'version', payload)
def getTxMsg(payload):
return makeMessage(magic, 'tx', payload)
def disect_ping(payload, length):
nonce = payload[:0 + 8].encode('hex')
return [nonce]
def disect_pong(payload, length):
nonce = payload[:0 + 8].encode('hex')
return [nonce]
def disect_reject(payload, length):
return payload[:length]
# FIXME
def disect_inv(payload, length):
return payload.encode('hex')
# FIXME
def disect_verack(payload, length):
return payload.encode('hex')
def disect_inventory_item(payload):
type = payload[:0 + 4].encode('hex')
hash = payload[4:4 + 32].encode('hex')
return[type,hash]
def disect_netaddress(payload):
time = payload[:0:4].encode('hex')
services = payload[4:4 + 8].encode('hex')
ipv64 = payload[12:12 + 16].encode('hex')
port = payload[16:16 + 2].encode('hex')
return [time,services,ipv64,port]
def disect_version(payload, length):
version = payload[:0 + 4].encode('hex')
services = payload[4:4 + 8].encode('hex')
timestamp = payload[12:12 + 8].encode('hex')
addr_recv = disect_netaddress(payload[20:20 + 26].encode('hex'))
addr_from = disect_netaddress(payload[26:26 + 26].encode('hex'))
nonce = payload[20:20 + 26].encode('hex')
user_agent = repr(payload[:46])
return [version, services, timestamp, addr_recv, addr_from, nonce, user_agent]
# FIXME
def disect_getheaders(payload, length):
return payload.encode('hex')
def disect_msg(r):
# decode message fields
# maybe this can be done with a struct.unpack
s = [r[:4], r[4:4 + 12], r[16:16 + 4], r[20:20 + 4], r[24:]]
if s[0].encode('hex') == 'f9beb4d9':
length = struct.unpack("<I", s[2])[0]
command = s[1].replace('\0','')
checksum = s[3].encode('hex')
payload = s[4][:length]
if command == 'version':
decoded = disect_version(payload,length)
elif command == 'inv':
decoded = disect_inv(payload,length)
elif command == 'reject':
decoded = disect_reject(payload,length)
if decoded.find('bad-txns-inputs-spent') > 0:
# return -1
sys.exit()
elif command == 'getheaders':
decoded = disect_getheaders(payload,length)
elif command == 'verack':
decoded = disect_verack(payload,length)
elif command == 'ping':
decoded = disect_ping(payload,length)
else:
decoded = repr(payload)
print(command, length, decoded)
def relayTx(tx, node):
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
try:
sock.connect(node)
print("connected...")
sock.send(getVersionMsg())
disect_msg(sock.recv(1000))
disect_msg(sock.recv(1000))
sock.send(getTxMsg(tx.decode('hex')))
disect_msg(sock.recv(1000))
disect_msg(sock.recv(1000))
sock.close()
except:
print("Socket Exception")